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serial: tegra: drop bogus NULL tty-port checks
[linux/fpc-iii.git] / drivers / tty / synclink.c
blob08d2976593d5d62aa14ce86aa5eb4227e43f2cb2
1 // SPDX-License-Identifier: GPL-1.0+
2 /*
3 * $Id: synclink.c,v 4.38 2005/11/07 16:30:34 paulkf Exp $
4 *
5 * Device driver for Microgate SyncLink ISA and PCI
6 * high speed multiprotocol serial adapters.
7 *
8 * written by Paul Fulghum for Microgate Corporation
9 * paulkf@microgate.com
10 *
11 * Microgate and SyncLink are trademarks of Microgate Corporation
12 *
13 * Derived from serial.c written by Theodore Ts'o and Linus Torvalds
14 *
15 * Original release 01/11/99
16 *
17 * This driver is primarily intended for use in synchronous
18 * HDLC mode. Asynchronous mode is also provided.
19 *
20 * When operating in synchronous mode, each call to mgsl_write()
21 * contains exactly one complete HDLC frame. Calling mgsl_put_char
22 * will start assembling an HDLC frame that will not be sent until
23 * mgsl_flush_chars or mgsl_write is called.
24 *
25 * Synchronous receive data is reported as complete frames. To accomplish
26 * this, the TTY flip buffer is bypassed (too small to hold largest
27 * frame and may fragment frames) and the line discipline
28 * receive entry point is called directly.
29 *
30 * This driver has been tested with a slightly modified ppp.c driver
31 * for synchronous PPP.
32 *
33 * 2000/02/16
34 * Added interface for syncppp.c driver (an alternate synchronous PPP
35 * implementation that also supports Cisco HDLC). Each device instance
36 * registers as a tty device AND a network device (if dosyncppp option
37 * is set for the device). The functionality is determined by which
38 * device interface is opened.
39 *
40 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
41 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
42 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
43 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
44 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
45 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
46 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 */
52
53 #if defined(__i386__)
54 # define BREAKPOINT() asm(" int $3");
55 #else
56 # define BREAKPOINT() { }
57 #endif
58
59 #define MAX_ISA_DEVICES 10
60 #define MAX_PCI_DEVICES 10
61 #define MAX_TOTAL_DEVICES 20
62
63 #include <linux/module.h>
64 #include <linux/errno.h>
65 #include <linux/signal.h>
66 #include <linux/sched.h>
67 #include <linux/timer.h>
68 #include <linux/interrupt.h>
69 #include <linux/pci.h>
70 #include <linux/tty.h>
71 #include <linux/tty_flip.h>
72 #include <linux/serial.h>
73 #include <linux/major.h>
74 #include <linux/string.h>
75 #include <linux/fcntl.h>
76 #include <linux/ptrace.h>
77 #include <linux/ioport.h>
78 #include <linux/mm.h>
79 #include <linux/seq_file.h>
80 #include <linux/slab.h>
81 #include <linux/delay.h>
82 #include <linux/netdevice.h>
83 #include <linux/vmalloc.h>
84 #include <linux/init.h>
85 #include <linux/ioctl.h>
86 #include <linux/synclink.h>
87
88 #include <asm/io.h>
89 #include <asm/irq.h>
90 #include <asm/dma.h>
91 #include <linux/bitops.h>
92 #include <asm/types.h>
93 #include <linux/termios.h>
94 #include <linux/workqueue.h>
95 #include <linux/hdlc.h>
96 #include <linux/dma-mapping.h>
97
98 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_MODULE))
99 #define SYNCLINK_GENERIC_HDLC 1
100 #else
101 #define SYNCLINK_GENERIC_HDLC 0
102 #endif
103
104 #define GET_USER(error,value,addr) error = get_user(value,addr)
105 #define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
106 #define PUT_USER(error,value,addr) error = put_user(value,addr)
107 #define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
108
109 #include <linux/uaccess.h>
110
111 #define RCLRVALUE 0xffff
112
113 static MGSL_PARAMS default_params = {
114 MGSL_MODE_HDLC, /* unsigned long mode */
115 0, /* unsigned char loopback; */
116 HDLC_FLAG_UNDERRUN_ABORT15, /* unsigned short flags; */
117 HDLC_ENCODING_NRZI_SPACE, /* unsigned char encoding; */
118 0, /* unsigned long clock_speed; */
119 0xff, /* unsigned char addr_filter; */
120 HDLC_CRC_16_CCITT, /* unsigned short crc_type; */
121 HDLC_PREAMBLE_LENGTH_8BITS, /* unsigned char preamble_length; */
122 HDLC_PREAMBLE_PATTERN_NONE, /* unsigned char preamble; */
123 9600, /* unsigned long data_rate; */
124 8, /* unsigned char data_bits; */
125 1, /* unsigned char stop_bits; */
126 ASYNC_PARITY_NONE /* unsigned char parity; */
127 };
128
129 #define SHARED_MEM_ADDRESS_SIZE 0x40000
130 #define BUFFERLISTSIZE 4096
131 #define DMABUFFERSIZE 4096
132 #define MAXRXFRAMES 7
133
134 typedef struct _DMABUFFERENTRY
135 {
136 u32 phys_addr; /* 32-bit flat physical address of data buffer */
137 volatile u16 count; /* buffer size/data count */
138 volatile u16 status; /* Control/status field */
139 volatile u16 rcc; /* character count field */
140 u16 reserved; /* padding required by 16C32 */
141 u32 link; /* 32-bit flat link to next buffer entry */
142 char *virt_addr; /* virtual address of data buffer */
143 u32 phys_entry; /* physical address of this buffer entry */
144 dma_addr_t dma_addr;
145 } DMABUFFERENTRY, *DMAPBUFFERENTRY;
146
147 /* The queue of BH actions to be performed */
148
149 #define BH_RECEIVE 1
150 #define BH_TRANSMIT 2
151 #define BH_STATUS 4
152
153 #define IO_PIN_SHUTDOWN_LIMIT 100
154
155 struct _input_signal_events {
156 int ri_up;
157 int ri_down;
158 int dsr_up;
159 int dsr_down;
160 int dcd_up;
161 int dcd_down;
162 int cts_up;
163 int cts_down;
164 };
165
166 /* transmit holding buffer definitions*/
167 #define MAX_TX_HOLDING_BUFFERS 5
168 struct tx_holding_buffer {
169 int buffer_size;
170 unsigned char * buffer;
171 };
172
173
174 /*
175 * Device instance data structure
176 */
177
178 struct mgsl_struct {
179 int magic;
180 struct tty_port port;
181 int line;
182 int hw_version;
183
184 struct mgsl_icount icount;
185
186 int timeout;
187 int x_char; /* xon/xoff character */
188 u16 read_status_mask;
189 u16 ignore_status_mask;
190 unsigned char *xmit_buf;
191 int xmit_head;
192 int xmit_tail;
193 int xmit_cnt;
194
195 wait_queue_head_t status_event_wait_q;
196 wait_queue_head_t event_wait_q;
197 struct timer_list tx_timer; /* HDLC transmit timeout timer */
198 struct mgsl_struct *next_device; /* device list link */
199
200 spinlock_t irq_spinlock; /* spinlock for synchronizing with ISR */
201 struct work_struct task; /* task structure for scheduling bh */
202
203 u32 EventMask; /* event trigger mask */
204 u32 RecordedEvents; /* pending events */
205
206 u32 max_frame_size; /* as set by device config */
207
208 u32 pending_bh;
209
210 bool bh_running; /* Protection from multiple */
211 int isr_overflow;
212 bool bh_requested;
213
214 int dcd_chkcount; /* check counts to prevent */
215 int cts_chkcount; /* too many IRQs if a signal */
216 int dsr_chkcount; /* is floating */
217 int ri_chkcount;
218
219 char *buffer_list; /* virtual address of Rx & Tx buffer lists */
220 u32 buffer_list_phys;
221 dma_addr_t buffer_list_dma_addr;
222
223 unsigned int rx_buffer_count; /* count of total allocated Rx buffers */
224 DMABUFFERENTRY *rx_buffer_list; /* list of receive buffer entries */
225 unsigned int current_rx_buffer;
226
227 int num_tx_dma_buffers; /* number of tx dma frames required */
228 int tx_dma_buffers_used;
229 unsigned int tx_buffer_count; /* count of total allocated Tx buffers */
230 DMABUFFERENTRY *tx_buffer_list; /* list of transmit buffer entries */
231 int start_tx_dma_buffer; /* tx dma buffer to start tx dma operation */
232 int current_tx_buffer; /* next tx dma buffer to be loaded */
233
234 unsigned char *intermediate_rxbuffer;
235
236 int num_tx_holding_buffers; /* number of tx holding buffer allocated */
237 int get_tx_holding_index; /* next tx holding buffer for adapter to load */
238 int put_tx_holding_index; /* next tx holding buffer to store user request */
239 int tx_holding_count; /* number of tx holding buffers waiting */
240 struct tx_holding_buffer tx_holding_buffers[MAX_TX_HOLDING_BUFFERS];
241
242 bool rx_enabled;
243 bool rx_overflow;
244 bool rx_rcc_underrun;
245
246 bool tx_enabled;
247 bool tx_active;
248 u32 idle_mode;
249
250 u16 cmr_value;
251 u16 tcsr_value;
252
253 char device_name[25]; /* device instance name */
254
255 unsigned int bus_type; /* expansion bus type (ISA,EISA,PCI) */
256 unsigned char bus; /* expansion bus number (zero based) */
257 unsigned char function; /* PCI device number */
258
259 unsigned int io_base; /* base I/O address of adapter */
260 unsigned int io_addr_size; /* size of the I/O address range */
261 bool io_addr_requested; /* true if I/O address requested */
262
263 unsigned int irq_level; /* interrupt level */
264 unsigned long irq_flags;
265 bool irq_requested; /* true if IRQ requested */
266
267 unsigned int dma_level; /* DMA channel */
268 bool dma_requested; /* true if dma channel requested */
269
270 u16 mbre_bit;
271 u16 loopback_bits;
272 u16 usc_idle_mode;
273
274 MGSL_PARAMS params; /* communications parameters */
275
276 unsigned char serial_signals; /* current serial signal states */
277
278 bool irq_occurred; /* for diagnostics use */
279 unsigned int init_error; /* Initialization startup error (DIAGS) */
280 int fDiagnosticsmode; /* Driver in Diagnostic mode? (DIAGS) */
281
282 u32 last_mem_alloc;
283 unsigned char* memory_base; /* shared memory address (PCI only) */
284 u32 phys_memory_base;
285 bool shared_mem_requested;
286
287 unsigned char* lcr_base; /* local config registers (PCI only) */
288 u32 phys_lcr_base;
289 u32 lcr_offset;
290 bool lcr_mem_requested;
291
292 u32 misc_ctrl_value;
293 char *flag_buf;
294 bool drop_rts_on_tx_done;
295
296 bool loopmode_insert_requested;
297 bool loopmode_send_done_requested;
298
299 struct _input_signal_events input_signal_events;
300
301 /* generic HDLC device parts */
302 int netcount;
303 spinlock_t netlock;
304
305 #if SYNCLINK_GENERIC_HDLC
306 struct net_device *netdev;
307 #endif
308 };
309
310 #define MGSL_MAGIC 0x5401
311
312 /*
313 * The size of the serial xmit buffer is 1 page, or 4096 bytes
314 */
315 #ifndef SERIAL_XMIT_SIZE
316 #define SERIAL_XMIT_SIZE 4096
317 #endif
318
319 /*
320 * These macros define the offsets used in calculating the
321 * I/O address of the specified USC registers.
322 */
323
324
325 #define DCPIN 2 /* Bit 1 of I/O address */
326 #define SDPIN 4 /* Bit 2 of I/O address */
327
328 #define DCAR 0 /* DMA command/address register */
329 #define CCAR SDPIN /* channel command/address register */
330 #define DATAREG DCPIN + SDPIN /* serial data register */
331 #define MSBONLY 0x41
332 #define LSBONLY 0x40
333
334 /*
335 * These macros define the register address (ordinal number)
336 * used for writing address/value pairs to the USC.
337 */
338
339 #define CMR 0x02 /* Channel mode Register */
340 #define CCSR 0x04 /* Channel Command/status Register */
341 #define CCR 0x06 /* Channel Control Register */
342 #define PSR 0x08 /* Port status Register */
343 #define PCR 0x0a /* Port Control Register */
344 #define TMDR 0x0c /* Test mode Data Register */
345 #define TMCR 0x0e /* Test mode Control Register */
346 #define CMCR 0x10 /* Clock mode Control Register */
347 #define HCR 0x12 /* Hardware Configuration Register */
348 #define IVR 0x14 /* Interrupt Vector Register */
349 #define IOCR 0x16 /* Input/Output Control Register */
350 #define ICR 0x18 /* Interrupt Control Register */
351 #define DCCR 0x1a /* Daisy Chain Control Register */
352 #define MISR 0x1c /* Misc Interrupt status Register */
353 #define SICR 0x1e /* status Interrupt Control Register */
354 #define RDR 0x20 /* Receive Data Register */
355 #define RMR 0x22 /* Receive mode Register */
356 #define RCSR 0x24 /* Receive Command/status Register */
357 #define RICR 0x26 /* Receive Interrupt Control Register */
358 #define RSR 0x28 /* Receive Sync Register */
359 #define RCLR 0x2a /* Receive count Limit Register */
360 #define RCCR 0x2c /* Receive Character count Register */
361 #define TC0R 0x2e /* Time Constant 0 Register */
362 #define TDR 0x30 /* Transmit Data Register */
363 #define TMR 0x32 /* Transmit mode Register */
364 #define TCSR 0x34 /* Transmit Command/status Register */
365 #define TICR 0x36 /* Transmit Interrupt Control Register */
366 #define TSR 0x38 /* Transmit Sync Register */
367 #define TCLR 0x3a /* Transmit count Limit Register */
368 #define TCCR 0x3c /* Transmit Character count Register */
369 #define TC1R 0x3e /* Time Constant 1 Register */
370
371
372 /*
373 * MACRO DEFINITIONS FOR DMA REGISTERS
374 */
375
376 #define DCR 0x06 /* DMA Control Register (shared) */
377 #define DACR 0x08 /* DMA Array count Register (shared) */
378 #define BDCR 0x12 /* Burst/Dwell Control Register (shared) */
379 #define DIVR 0x14 /* DMA Interrupt Vector Register (shared) */
380 #define DICR 0x18 /* DMA Interrupt Control Register (shared) */
381 #define CDIR 0x1a /* Clear DMA Interrupt Register (shared) */
382 #define SDIR 0x1c /* Set DMA Interrupt Register (shared) */
383
384 #define TDMR 0x02 /* Transmit DMA mode Register */
385 #define TDIAR 0x1e /* Transmit DMA Interrupt Arm Register */
386 #define TBCR 0x2a /* Transmit Byte count Register */
387 #define TARL 0x2c /* Transmit Address Register (low) */
388 #define TARU 0x2e /* Transmit Address Register (high) */
389 #define NTBCR 0x3a /* Next Transmit Byte count Register */
390 #define NTARL 0x3c /* Next Transmit Address Register (low) */
391 #define NTARU 0x3e /* Next Transmit Address Register (high) */
392
393 #define RDMR 0x82 /* Receive DMA mode Register (non-shared) */
394 #define RDIAR 0x9e /* Receive DMA Interrupt Arm Register */
395 #define RBCR 0xaa /* Receive Byte count Register */
396 #define RARL 0xac /* Receive Address Register (low) */
397 #define RARU 0xae /* Receive Address Register (high) */
398 #define NRBCR 0xba /* Next Receive Byte count Register */
399 #define NRARL 0xbc /* Next Receive Address Register (low) */
400 #define NRARU 0xbe /* Next Receive Address Register (high) */
401
402
403 /*
404 * MACRO DEFINITIONS FOR MODEM STATUS BITS
405 */
406
407 #define MODEMSTATUS_DTR 0x80
408 #define MODEMSTATUS_DSR 0x40
409 #define MODEMSTATUS_RTS 0x20
410 #define MODEMSTATUS_CTS 0x10
411 #define MODEMSTATUS_RI 0x04
412 #define MODEMSTATUS_DCD 0x01
413
414
415 /*
416 * Channel Command/Address Register (CCAR) Command Codes
417 */
418
419 #define RTCmd_Null 0x0000
420 #define RTCmd_ResetHighestIus 0x1000
421 #define RTCmd_TriggerChannelLoadDma 0x2000
422 #define RTCmd_TriggerRxDma 0x2800
423 #define RTCmd_TriggerTxDma 0x3000
424 #define RTCmd_TriggerRxAndTxDma 0x3800
425 #define RTCmd_PurgeRxFifo 0x4800
426 #define RTCmd_PurgeTxFifo 0x5000
427 #define RTCmd_PurgeRxAndTxFifo 0x5800
428 #define RTCmd_LoadRcc 0x6800
429 #define RTCmd_LoadTcc 0x7000
430 #define RTCmd_LoadRccAndTcc 0x7800
431 #define RTCmd_LoadTC0 0x8800
432 #define RTCmd_LoadTC1 0x9000
433 #define RTCmd_LoadTC0AndTC1 0x9800
434 #define RTCmd_SerialDataLSBFirst 0xa000
435 #define RTCmd_SerialDataMSBFirst 0xa800
436 #define RTCmd_SelectBigEndian 0xb000
437 #define RTCmd_SelectLittleEndian 0xb800
438
439
440 /*
441 * DMA Command/Address Register (DCAR) Command Codes
442 */
443
444 #define DmaCmd_Null 0x0000
445 #define DmaCmd_ResetTxChannel 0x1000
446 #define DmaCmd_ResetRxChannel 0x1200
447 #define DmaCmd_StartTxChannel 0x2000
448 #define DmaCmd_StartRxChannel 0x2200
449 #define DmaCmd_ContinueTxChannel 0x3000
450 #define DmaCmd_ContinueRxChannel 0x3200
451 #define DmaCmd_PauseTxChannel 0x4000
452 #define DmaCmd_PauseRxChannel 0x4200
453 #define DmaCmd_AbortTxChannel 0x5000
454 #define DmaCmd_AbortRxChannel 0x5200
455 #define DmaCmd_InitTxChannel 0x7000
456 #define DmaCmd_InitRxChannel 0x7200
457 #define DmaCmd_ResetHighestDmaIus 0x8000
458 #define DmaCmd_ResetAllChannels 0x9000
459 #define DmaCmd_StartAllChannels 0xa000
460 #define DmaCmd_ContinueAllChannels 0xb000
461 #define DmaCmd_PauseAllChannels 0xc000
462 #define DmaCmd_AbortAllChannels 0xd000
463 #define DmaCmd_InitAllChannels 0xf000
464
465 #define TCmd_Null 0x0000
466 #define TCmd_ClearTxCRC 0x2000
467 #define TCmd_SelectTicrTtsaData 0x4000
468 #define TCmd_SelectTicrTxFifostatus 0x5000
469 #define TCmd_SelectTicrIntLevel 0x6000
470 #define TCmd_SelectTicrdma_level 0x7000
471 #define TCmd_SendFrame 0x8000
472 #define TCmd_SendAbort 0x9000
473 #define TCmd_EnableDleInsertion 0xc000
474 #define TCmd_DisableDleInsertion 0xd000
475 #define TCmd_ClearEofEom 0xe000
476 #define TCmd_SetEofEom 0xf000
477
478 #define RCmd_Null 0x0000
479 #define RCmd_ClearRxCRC 0x2000
480 #define RCmd_EnterHuntmode 0x3000
481 #define RCmd_SelectRicrRtsaData 0x4000
482 #define RCmd_SelectRicrRxFifostatus 0x5000
483 #define RCmd_SelectRicrIntLevel 0x6000
484 #define RCmd_SelectRicrdma_level 0x7000
485
486 /*
487 * Bits for enabling and disabling IRQs in Interrupt Control Register (ICR)
488 */
489
490 #define RECEIVE_STATUS BIT5
491 #define RECEIVE_DATA BIT4
492 #define TRANSMIT_STATUS BIT3
493 #define TRANSMIT_DATA BIT2
494 #define IO_PIN BIT1
495 #define MISC BIT0
496
497
498 /*
499 * Receive status Bits in Receive Command/status Register RCSR
500 */
501
502 #define RXSTATUS_SHORT_FRAME BIT8
503 #define RXSTATUS_CODE_VIOLATION BIT8
504 #define RXSTATUS_EXITED_HUNT BIT7
505 #define RXSTATUS_IDLE_RECEIVED BIT6
506 #define RXSTATUS_BREAK_RECEIVED BIT5
507 #define RXSTATUS_ABORT_RECEIVED BIT5
508 #define RXSTATUS_RXBOUND BIT4
509 #define RXSTATUS_CRC_ERROR BIT3
510 #define RXSTATUS_FRAMING_ERROR BIT3
511 #define RXSTATUS_ABORT BIT2
512 #define RXSTATUS_PARITY_ERROR BIT2
513 #define RXSTATUS_OVERRUN BIT1
514 #define RXSTATUS_DATA_AVAILABLE BIT0
515 #define RXSTATUS_ALL 0x01f6
516 #define usc_UnlatchRxstatusBits(a,b) usc_OutReg( (a), RCSR, (u16)((b) & RXSTATUS_ALL) )
517
518 /*
519 * Values for setting transmit idle mode in
520 * Transmit Control/status Register (TCSR)
521 */
522 #define IDLEMODE_FLAGS 0x0000
523 #define IDLEMODE_ALT_ONE_ZERO 0x0100
524 #define IDLEMODE_ZERO 0x0200
525 #define IDLEMODE_ONE 0x0300
526 #define IDLEMODE_ALT_MARK_SPACE 0x0500
527 #define IDLEMODE_SPACE 0x0600
528 #define IDLEMODE_MARK 0x0700
529 #define IDLEMODE_MASK 0x0700
530
531 /*
532 * IUSC revision identifiers
533 */
534 #define IUSC_SL1660 0x4d44
535 #define IUSC_PRE_SL1660 0x4553
536
537 /*
538 * Transmit status Bits in Transmit Command/status Register (TCSR)
539 */
540
541 #define TCSR_PRESERVE 0x0F00
542
543 #define TCSR_UNDERWAIT BIT11
544 #define TXSTATUS_PREAMBLE_SENT BIT7
545 #define TXSTATUS_IDLE_SENT BIT6
546 #define TXSTATUS_ABORT_SENT BIT5
547 #define TXSTATUS_EOF_SENT BIT4
548 #define TXSTATUS_EOM_SENT BIT4
549 #define TXSTATUS_CRC_SENT BIT3
550 #define TXSTATUS_ALL_SENT BIT2
551 #define TXSTATUS_UNDERRUN BIT1
552 #define TXSTATUS_FIFO_EMPTY BIT0
553 #define TXSTATUS_ALL 0x00fa
554 #define usc_UnlatchTxstatusBits(a,b) usc_OutReg( (a), TCSR, (u16)((a)->tcsr_value + ((b) & 0x00FF)) )
555
556
557 #define MISCSTATUS_RXC_LATCHED BIT15
558 #define MISCSTATUS_RXC BIT14
559 #define MISCSTATUS_TXC_LATCHED BIT13
560 #define MISCSTATUS_TXC BIT12
561 #define MISCSTATUS_RI_LATCHED BIT11
562 #define MISCSTATUS_RI BIT10
563 #define MISCSTATUS_DSR_LATCHED BIT9
564 #define MISCSTATUS_DSR BIT8
565 #define MISCSTATUS_DCD_LATCHED BIT7
566 #define MISCSTATUS_DCD BIT6
567 #define MISCSTATUS_CTS_LATCHED BIT5
568 #define MISCSTATUS_CTS BIT4
569 #define MISCSTATUS_RCC_UNDERRUN BIT3
570 #define MISCSTATUS_DPLL_NO_SYNC BIT2
571 #define MISCSTATUS_BRG1_ZERO BIT1
572 #define MISCSTATUS_BRG0_ZERO BIT0
573
574 #define usc_UnlatchIostatusBits(a,b) usc_OutReg((a),MISR,(u16)((b) & 0xaaa0))
575 #define usc_UnlatchMiscstatusBits(a,b) usc_OutReg((a),MISR,(u16)((b) & 0x000f))
576
577 #define SICR_RXC_ACTIVE BIT15
578 #define SICR_RXC_INACTIVE BIT14
579 #define SICR_RXC (BIT15|BIT14)
580 #define SICR_TXC_ACTIVE BIT13
581 #define SICR_TXC_INACTIVE BIT12
582 #define SICR_TXC (BIT13|BIT12)
583 #define SICR_RI_ACTIVE BIT11
584 #define SICR_RI_INACTIVE BIT10
585 #define SICR_RI (BIT11|BIT10)
586 #define SICR_DSR_ACTIVE BIT9
587 #define SICR_DSR_INACTIVE BIT8
588 #define SICR_DSR (BIT9|BIT8)
589 #define SICR_DCD_ACTIVE BIT7
590 #define SICR_DCD_INACTIVE BIT6
591 #define SICR_DCD (BIT7|BIT6)
592 #define SICR_CTS_ACTIVE BIT5
593 #define SICR_CTS_INACTIVE BIT4
594 #define SICR_CTS (BIT5|BIT4)
595 #define SICR_RCC_UNDERFLOW BIT3
596 #define SICR_DPLL_NO_SYNC BIT2
597 #define SICR_BRG1_ZERO BIT1
598 #define SICR_BRG0_ZERO BIT0
599
600 void usc_DisableMasterIrqBit( struct mgsl_struct *info );
601 void usc_EnableMasterIrqBit( struct mgsl_struct *info );
602 void usc_EnableInterrupts( struct mgsl_struct *info, u16 IrqMask );
603 void usc_DisableInterrupts( struct mgsl_struct *info, u16 IrqMask );
604 void usc_ClearIrqPendingBits( struct mgsl_struct *info, u16 IrqMask );
605
606 #define usc_EnableInterrupts( a, b ) \
607 usc_OutReg( (a), ICR, (u16)((usc_InReg((a),ICR) & 0xff00) + 0xc0 + (b)) )
608
609 #define usc_DisableInterrupts( a, b ) \
610 usc_OutReg( (a), ICR, (u16)((usc_InReg((a),ICR) & 0xff00) + 0x80 + (b)) )
611
612 #define usc_EnableMasterIrqBit(a) \
613 usc_OutReg( (a), ICR, (u16)((usc_InReg((a),ICR) & 0x0f00) + 0xb000) )
614
615 #define usc_DisableMasterIrqBit(a) \
616 usc_OutReg( (a), ICR, (u16)(usc_InReg((a),ICR) & 0x7f00) )
617
618 #define usc_ClearIrqPendingBits( a, b ) usc_OutReg( (a), DCCR, 0x40 + (b) )
619
620 /*
621 * Transmit status Bits in Transmit Control status Register (TCSR)
622 * and Transmit Interrupt Control Register (TICR) (except BIT2, BIT0)
623 */
624
625 #define TXSTATUS_PREAMBLE_SENT BIT7
626 #define TXSTATUS_IDLE_SENT BIT6
627 #define TXSTATUS_ABORT_SENT BIT5
628 #define TXSTATUS_EOF BIT4
629 #define TXSTATUS_CRC_SENT BIT3
630 #define TXSTATUS_ALL_SENT BIT2
631 #define TXSTATUS_UNDERRUN BIT1
632 #define TXSTATUS_FIFO_EMPTY BIT0
633
634 #define DICR_MASTER BIT15
635 #define DICR_TRANSMIT BIT0
636 #define DICR_RECEIVE BIT1
637
638 #define usc_EnableDmaInterrupts(a,b) \
639 usc_OutDmaReg( (a), DICR, (u16)(usc_InDmaReg((a),DICR) | (b)) )
640
641 #define usc_DisableDmaInterrupts(a,b) \
642 usc_OutDmaReg( (a), DICR, (u16)(usc_InDmaReg((a),DICR) & ~(b)) )
643
644 #define usc_EnableStatusIrqs(a,b) \
645 usc_OutReg( (a), SICR, (u16)(usc_InReg((a),SICR) | (b)) )
646
647 #define usc_DisablestatusIrqs(a,b) \
648 usc_OutReg( (a), SICR, (u16)(usc_InReg((a),SICR) & ~(b)) )
649
650 /* Transmit status Bits in Transmit Control status Register (TCSR) */
651 /* and Transmit Interrupt Control Register (TICR) (except BIT2, BIT0) */
652
653
654 #define DISABLE_UNCONDITIONAL 0
655 #define DISABLE_END_OF_FRAME 1
656 #define ENABLE_UNCONDITIONAL 2
657 #define ENABLE_AUTO_CTS 3
658 #define ENABLE_AUTO_DCD 3
659 #define usc_EnableTransmitter(a,b) \
660 usc_OutReg( (a), TMR, (u16)((usc_InReg((a),TMR) & 0xfffc) | (b)) )
661 #define usc_EnableReceiver(a,b) \
662 usc_OutReg( (a), RMR, (u16)((usc_InReg((a),RMR) & 0xfffc) | (b)) )
663
664 static u16 usc_InDmaReg( struct mgsl_struct *info, u16 Port );
665 static void usc_OutDmaReg( struct mgsl_struct *info, u16 Port, u16 Value );
666 static void usc_DmaCmd( struct mgsl_struct *info, u16 Cmd );
667
668 static u16 usc_InReg( struct mgsl_struct *info, u16 Port );
669 static void usc_OutReg( struct mgsl_struct *info, u16 Port, u16 Value );
670 static void usc_RTCmd( struct mgsl_struct *info, u16 Cmd );
671 void usc_RCmd( struct mgsl_struct *info, u16 Cmd );
672 void usc_TCmd( struct mgsl_struct *info, u16 Cmd );
673
674 #define usc_TCmd(a,b) usc_OutReg((a), TCSR, (u16)((a)->tcsr_value + (b)))
675 #define usc_RCmd(a,b) usc_OutReg((a), RCSR, (b))
676
677 #define usc_SetTransmitSyncChars(a,s0,s1) usc_OutReg((a), TSR, (u16)(((u16)s0<<8)|(u16)s1))
678
679 static void usc_process_rxoverrun_sync( struct mgsl_struct *info );
680 static void usc_start_receiver( struct mgsl_struct *info );
681 static void usc_stop_receiver( struct mgsl_struct *info );
682
683 static void usc_start_transmitter( struct mgsl_struct *info );
684 static void usc_stop_transmitter( struct mgsl_struct *info );
685 static void usc_set_txidle( struct mgsl_struct *info );
686 static void usc_load_txfifo( struct mgsl_struct *info );
687
688 static void usc_enable_aux_clock( struct mgsl_struct *info, u32 DataRate );
689 static void usc_enable_loopback( struct mgsl_struct *info, int enable );
690
691 static void usc_get_serial_signals( struct mgsl_struct *info );
692 static void usc_set_serial_signals( struct mgsl_struct *info );
693
694 static void usc_reset( struct mgsl_struct *info );
695
696 static void usc_set_sync_mode( struct mgsl_struct *info );
697 static void usc_set_sdlc_mode( struct mgsl_struct *info );
698 static void usc_set_async_mode( struct mgsl_struct *info );
699 static void usc_enable_async_clock( struct mgsl_struct *info, u32 DataRate );
700
701 static void usc_loopback_frame( struct mgsl_struct *info );
702
703 static void mgsl_tx_timeout(struct timer_list *t);
704
705
706 static void usc_loopmode_cancel_transmit( struct mgsl_struct * info );
707 static void usc_loopmode_insert_request( struct mgsl_struct * info );
708 static int usc_loopmode_active( struct mgsl_struct * info);
709 static void usc_loopmode_send_done( struct mgsl_struct * info );
710
711 static int mgsl_ioctl_common(struct mgsl_struct *info, unsigned int cmd, unsigned long arg);
712
713 #if SYNCLINK_GENERIC_HDLC
714 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
715 static void hdlcdev_tx_done(struct mgsl_struct *info);
716 static void hdlcdev_rx(struct mgsl_struct *info, char *buf, int size);
717 static int hdlcdev_init(struct mgsl_struct *info);
718 static void hdlcdev_exit(struct mgsl_struct *info);
719 #endif
720
721 /*
722 * Defines a BUS descriptor value for the PCI adapter
723 * local bus address ranges.
724 */
725
726 #define BUS_DESCRIPTOR( WrHold, WrDly, RdDly, Nwdd, Nwad, Nxda, Nrdd, Nrad ) \
727 (0x00400020 + \
728 ((WrHold) << 30) + \
729 ((WrDly) << 28) + \
730 ((RdDly) << 26) + \
731 ((Nwdd) << 20) + \
732 ((Nwad) << 15) + \
733 ((Nxda) << 13) + \
734 ((Nrdd) << 11) + \
735 ((Nrad) << 6) )
736
737 static void mgsl_trace_block(struct mgsl_struct *info,const char* data, int count, int xmit);
738
739 /*
740 * Adapter diagnostic routines
741 */
742 static bool mgsl_register_test( struct mgsl_struct *info );
743 static bool mgsl_irq_test( struct mgsl_struct *info );
744 static bool mgsl_dma_test( struct mgsl_struct *info );
745 static bool mgsl_memory_test( struct mgsl_struct *info );
746 static int mgsl_adapter_test( struct mgsl_struct *info );
747
748 /*
749 * device and resource management routines
750 */
751 static int mgsl_claim_resources(struct mgsl_struct *info);
752 static void mgsl_release_resources(struct mgsl_struct *info);
753 static void mgsl_add_device(struct mgsl_struct *info);
754 static struct mgsl_struct* mgsl_allocate_device(void);
755
756 /*
757 * DMA buffer manupulation functions.
758 */
759 static void mgsl_free_rx_frame_buffers( struct mgsl_struct *info, unsigned int StartIndex, unsigned int EndIndex );
760 static bool mgsl_get_rx_frame( struct mgsl_struct *info );
761 static bool mgsl_get_raw_rx_frame( struct mgsl_struct *info );
762 static void mgsl_reset_rx_dma_buffers( struct mgsl_struct *info );
763 static void mgsl_reset_tx_dma_buffers( struct mgsl_struct *info );
764 static int num_free_tx_dma_buffers(struct mgsl_struct *info);
765 static void mgsl_load_tx_dma_buffer( struct mgsl_struct *info, const char *Buffer, unsigned int BufferSize);
766 static void mgsl_load_pci_memory(char* TargetPtr, const char* SourcePtr, unsigned short count);
767
768 /*
769 * DMA and Shared Memory buffer allocation and formatting
770 */
771 static int mgsl_allocate_dma_buffers(struct mgsl_struct *info);
772 static void mgsl_free_dma_buffers(struct mgsl_struct *info);
773 static int mgsl_alloc_frame_memory(struct mgsl_struct *info, DMABUFFERENTRY *BufferList,int Buffercount);
774 static void mgsl_free_frame_memory(struct mgsl_struct *info, DMABUFFERENTRY *BufferList,int Buffercount);
775 static int mgsl_alloc_buffer_list_memory(struct mgsl_struct *info);
776 static void mgsl_free_buffer_list_memory(struct mgsl_struct *info);
777 static int mgsl_alloc_intermediate_rxbuffer_memory(struct mgsl_struct *info);
778 static void mgsl_free_intermediate_rxbuffer_memory(struct mgsl_struct *info);
779 static int mgsl_alloc_intermediate_txbuffer_memory(struct mgsl_struct *info);
780 static void mgsl_free_intermediate_txbuffer_memory(struct mgsl_struct *info);
781 static bool load_next_tx_holding_buffer(struct mgsl_struct *info);
782 static int save_tx_buffer_request(struct mgsl_struct *info,const char *Buffer, unsigned int BufferSize);
783
784 /*
785 * Bottom half interrupt handlers
786 */
787 static void mgsl_bh_handler(struct work_struct *work);
788 static void mgsl_bh_receive(struct mgsl_struct *info);
789 static void mgsl_bh_transmit(struct mgsl_struct *info);
790 static void mgsl_bh_status(struct mgsl_struct *info);
791
792 /*
793 * Interrupt handler routines and dispatch table.
794 */
795 static void mgsl_isr_null( struct mgsl_struct *info );
796 static void mgsl_isr_transmit_data( struct mgsl_struct *info );
797 static void mgsl_isr_receive_data( struct mgsl_struct *info );
798 static void mgsl_isr_receive_status( struct mgsl_struct *info );
799 static void mgsl_isr_transmit_status( struct mgsl_struct *info );
800 static void mgsl_isr_io_pin( struct mgsl_struct *info );
801 static void mgsl_isr_misc( struct mgsl_struct *info );
802 static void mgsl_isr_receive_dma( struct mgsl_struct *info );
803 static void mgsl_isr_transmit_dma( struct mgsl_struct *info );
804
805 typedef void (*isr_dispatch_func)(struct mgsl_struct *);
806
807 static isr_dispatch_func UscIsrTable[7] =
808 {
809 mgsl_isr_null,
810 mgsl_isr_misc,
811 mgsl_isr_io_pin,
812 mgsl_isr_transmit_data,
813 mgsl_isr_transmit_status,
814 mgsl_isr_receive_data,
815 mgsl_isr_receive_status
816 };
817
818 /*
819 * ioctl call handlers
820 */
821 static int tiocmget(struct tty_struct *tty);
822 static int tiocmset(struct tty_struct *tty,
823 unsigned int set, unsigned int clear);
824 static int mgsl_get_stats(struct mgsl_struct * info, struct mgsl_icount
825 __user *user_icount);
826 static int mgsl_get_params(struct mgsl_struct * info, MGSL_PARAMS __user *user_params);
827 static int mgsl_set_params(struct mgsl_struct * info, MGSL_PARAMS __user *new_params);
828 static int mgsl_get_txidle(struct mgsl_struct * info, int __user *idle_mode);
829 static int mgsl_set_txidle(struct mgsl_struct * info, int idle_mode);
830 static int mgsl_txenable(struct mgsl_struct * info, int enable);
831 static int mgsl_txabort(struct mgsl_struct * info);
832 static int mgsl_rxenable(struct mgsl_struct * info, int enable);
833 static int mgsl_wait_event(struct mgsl_struct * info, int __user *mask);
834 static int mgsl_loopmode_send_done( struct mgsl_struct * info );
835
836 /* set non-zero on successful registration with PCI subsystem */
837 static bool pci_registered;
838
839 /*
840 * Global linked list of SyncLink devices
841 */
842 static struct mgsl_struct *mgsl_device_list;
843 static int mgsl_device_count;
844
845 /*
846 * Set this param to non-zero to load eax with the
847 * .text section address and breakpoint on module load.
848 * This is useful for use with gdb and add-symbol-file command.
849 */
850 static bool break_on_load;
851
852 /*
853 * Driver major number, defaults to zero to get auto
854 * assigned major number. May be forced as module parameter.
855 */
856 static int ttymajor;
857
858 /*
859 * Array of user specified options for ISA adapters.
860 */
861 static int io[MAX_ISA_DEVICES];
862 static int irq[MAX_ISA_DEVICES];
863 static int dma[MAX_ISA_DEVICES];
864 static int debug_level;
865 static int maxframe[MAX_TOTAL_DEVICES];
866 static int txdmabufs[MAX_TOTAL_DEVICES];
867 static int txholdbufs[MAX_TOTAL_DEVICES];
868
869 module_param(break_on_load, bool, 0);
870 module_param(ttymajor, int, 0);
871 module_param_hw_array(io, int, ioport, NULL, 0);
872 module_param_hw_array(irq, int, irq, NULL, 0);
873 module_param_hw_array(dma, int, dma, NULL, 0);
874 module_param(debug_level, int, 0);
875 module_param_array(maxframe, int, NULL, 0);
876 module_param_array(txdmabufs, int, NULL, 0);
877 module_param_array(txholdbufs, int, NULL, 0);
878
879 static char *driver_name = "SyncLink serial driver";
880 static char *driver_version = "$Revision: 4.38 $";
881
882 static int synclink_init_one (struct pci_dev *dev,
883 const struct pci_device_id *ent);
884 static void synclink_remove_one (struct pci_dev *dev);
885
886 static const struct pci_device_id synclink_pci_tbl[] = {
887 { PCI_VENDOR_ID_MICROGATE, PCI_DEVICE_ID_MICROGATE_USC, PCI_ANY_ID, PCI_ANY_ID, },
888 { PCI_VENDOR_ID_MICROGATE, 0x0210, PCI_ANY_ID, PCI_ANY_ID, },
889 { 0, }, /* terminate list */
890 };
891 MODULE_DEVICE_TABLE(pci, synclink_pci_tbl);
892
893 MODULE_LICENSE("GPL");
894
895 static struct pci_driver synclink_pci_driver = {
896 .name = "synclink",
897 .id_table = synclink_pci_tbl,
898 .probe = synclink_init_one,
899 .remove = synclink_remove_one,
900 };
901
902 static struct tty_driver *serial_driver;
903
904 /* number of characters left in xmit buffer before we ask for more */
905 #define WAKEUP_CHARS 256
906
907
908 static void mgsl_change_params(struct mgsl_struct *info);
909 static void mgsl_wait_until_sent(struct tty_struct *tty, int timeout);
910
911 /*
912 * 1st function defined in .text section. Calling this function in
913 * init_module() followed by a breakpoint allows a remote debugger
914 * (gdb) to get the .text address for the add-symbol-file command.
915 * This allows remote debugging of dynamically loadable modules.
916 */
917 static void* mgsl_get_text_ptr(void)
918 {
919 return mgsl_get_text_ptr;
920 }
921
922 static inline int mgsl_paranoia_check(struct mgsl_struct *info,
923 char *name, const char *routine)
924 {
925 #ifdef MGSL_PARANOIA_CHECK
926 static const char *badmagic =
927 "Warning: bad magic number for mgsl struct (%s) in %s\n";
928 static const char *badinfo =
929 "Warning: null mgsl_struct for (%s) in %s\n";
930
931 if (!info) {
932 printk(badinfo, name, routine);
933 return 1;
934 }
935 if (info->magic != MGSL_MAGIC) {
936 printk(badmagic, name, routine);
937 return 1;
938 }
939 #else
940 if (!info)
941 return 1;
942 #endif
943 return 0;
944 }
945
946 /**
947 * line discipline callback wrappers
948 *
949 * The wrappers maintain line discipline references
950 * while calling into the line discipline.
951 *
952 * ldisc_receive_buf - pass receive data to line discipline
953 */
954
955 static void ldisc_receive_buf(struct tty_struct *tty,
956 const __u8 *data, char *flags, int count)
957 {
958 struct tty_ldisc *ld;
959 if (!tty)
960 return;
961 ld = tty_ldisc_ref(tty);
962 if (ld) {
963 if (ld->ops->receive_buf)
964 ld->ops->receive_buf(tty, data, flags, count);
965 tty_ldisc_deref(ld);
966 }
967 }
968
969 /* mgsl_stop() throttle (stop) transmitter
970 *
971 * Arguments: tty pointer to tty info structure
972 * Return Value: None
973 */
974 static void mgsl_stop(struct tty_struct *tty)
975 {
976 struct mgsl_struct *info = tty->driver_data;
977 unsigned long flags;
978
979 if (mgsl_paranoia_check(info, tty->name, "mgsl_stop"))
980 return;
981
982 if ( debug_level >= DEBUG_LEVEL_INFO )
983 printk("mgsl_stop(%s)\n",info->device_name);
984
985 spin_lock_irqsave(&info->irq_spinlock,flags);
986 if (info->tx_enabled)
987 usc_stop_transmitter(info);
988 spin_unlock_irqrestore(&info->irq_spinlock,flags);
989
990 } /* end of mgsl_stop() */
991
992 /* mgsl_start() release (start) transmitter
993 *
994 * Arguments: tty pointer to tty info structure
995 * Return Value: None
996 */
997 static void mgsl_start(struct tty_struct *tty)
998 {
999 struct mgsl_struct *info = tty->driver_data;
1000 unsigned long flags;
1001
1002 if (mgsl_paranoia_check(info, tty->name, "mgsl_start"))
1003 return;
1004
1005 if ( debug_level >= DEBUG_LEVEL_INFO )
1006 printk("mgsl_start(%s)\n",info->device_name);
1007
1008 spin_lock_irqsave(&info->irq_spinlock,flags);
1009 if (!info->tx_enabled)
1010 usc_start_transmitter(info);
1011 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1012
1013 } /* end of mgsl_start() */
1014
1015 /*
1016 * Bottom half work queue access functions
1017 */
1018
1019 /* mgsl_bh_action() Return next bottom half action to perform.
1020 * Return Value: BH action code or 0 if nothing to do.
1021 */
1022 static int mgsl_bh_action(struct mgsl_struct *info)
1023 {
1024 unsigned long flags;
1025 int rc = 0;
1026
1027 spin_lock_irqsave(&info->irq_spinlock,flags);
1028
1029 if (info->pending_bh & BH_RECEIVE) {
1030 info->pending_bh &= ~BH_RECEIVE;
1031 rc = BH_RECEIVE;
1032 } else if (info->pending_bh & BH_TRANSMIT) {
1033 info->pending_bh &= ~BH_TRANSMIT;
1034 rc = BH_TRANSMIT;
1035 } else if (info->pending_bh & BH_STATUS) {
1036 info->pending_bh &= ~BH_STATUS;
1037 rc = BH_STATUS;
1038 }
1039
1040 if (!rc) {
1041 /* Mark BH routine as complete */
1042 info->bh_running = false;
1043 info->bh_requested = false;
1044 }
1045
1046 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1047
1048 return rc;
1049 }
1050
1051 /*
1052 * Perform bottom half processing of work items queued by ISR.
1053 */
1054 static void mgsl_bh_handler(struct work_struct *work)
1055 {
1056 struct mgsl_struct *info =
1057 container_of(work, struct mgsl_struct, task);
1058 int action;
1059
1060 if ( debug_level >= DEBUG_LEVEL_BH )
1061 printk( "%s(%d):mgsl_bh_handler(%s) entry\n",
1062 __FILE__,__LINE__,info->device_name);
1063
1064 info->bh_running = true;
1065
1066 while((action = mgsl_bh_action(info)) != 0) {
1067
1068 /* Process work item */
1069 if ( debug_level >= DEBUG_LEVEL_BH )
1070 printk( "%s(%d):mgsl_bh_handler() work item action=%d\n",
1071 __FILE__,__LINE__,action);
1072
1073 switch (action) {
1074
1075 case BH_RECEIVE:
1076 mgsl_bh_receive(info);
1077 break;
1078 case BH_TRANSMIT:
1079 mgsl_bh_transmit(info);
1080 break;
1081 case BH_STATUS:
1082 mgsl_bh_status(info);
1083 break;
1084 default:
1085 /* unknown work item ID */
1086 printk("Unknown work item ID=%08X!\n", action);
1087 break;
1088 }
1089 }
1090
1091 if ( debug_level >= DEBUG_LEVEL_BH )
1092 printk( "%s(%d):mgsl_bh_handler(%s) exit\n",
1093 __FILE__,__LINE__,info->device_name);
1094 }
1095
1096 static void mgsl_bh_receive(struct mgsl_struct *info)
1097 {
1098 bool (*get_rx_frame)(struct mgsl_struct *info) =
1099 (info->params.mode == MGSL_MODE_HDLC ? mgsl_get_rx_frame : mgsl_get_raw_rx_frame);
1100
1101 if ( debug_level >= DEBUG_LEVEL_BH )
1102 printk( "%s(%d):mgsl_bh_receive(%s)\n",
1103 __FILE__,__LINE__,info->device_name);
1104
1105 do
1106 {
1107 if (info->rx_rcc_underrun) {
1108 unsigned long flags;
1109 spin_lock_irqsave(&info->irq_spinlock,flags);
1110 usc_start_receiver(info);
1111 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1112 return;
1113 }
1114 } while(get_rx_frame(info));
1115 }
1116
1117 static void mgsl_bh_transmit(struct mgsl_struct *info)
1118 {
1119 struct tty_struct *tty = info->port.tty;
1120 unsigned long flags;
1121
1122 if ( debug_level >= DEBUG_LEVEL_BH )
1123 printk( "%s(%d):mgsl_bh_transmit() entry on %s\n",
1124 __FILE__,__LINE__,info->device_name);
1125
1126 if (tty)
1127 tty_wakeup(tty);
1128
1129 /* if transmitter idle and loopmode_send_done_requested
1130 * then start echoing RxD to TxD
1131 */
1132 spin_lock_irqsave(&info->irq_spinlock,flags);
1133 if ( !info->tx_active && info->loopmode_send_done_requested )
1134 usc_loopmode_send_done( info );
1135 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1136 }
1137
1138 static void mgsl_bh_status(struct mgsl_struct *info)
1139 {
1140 if ( debug_level >= DEBUG_LEVEL_BH )
1141 printk( "%s(%d):mgsl_bh_status() entry on %s\n",
1142 __FILE__,__LINE__,info->device_name);
1143
1144 info->ri_chkcount = 0;
1145 info->dsr_chkcount = 0;
1146 info->dcd_chkcount = 0;
1147 info->cts_chkcount = 0;
1148 }
1149
1150 /* mgsl_isr_receive_status()
1151 *
1152 * Service a receive status interrupt. The type of status
1153 * interrupt is indicated by the state of the RCSR.
1154 * This is only used for HDLC mode.
1155 *
1156 * Arguments: info pointer to device instance data
1157 * Return Value: None
1158 */
1159 static void mgsl_isr_receive_status( struct mgsl_struct *info )
1160 {
1161 u16 status = usc_InReg( info, RCSR );
1162
1163 if ( debug_level >= DEBUG_LEVEL_ISR )
1164 printk("%s(%d):mgsl_isr_receive_status status=%04X\n",
1165 __FILE__,__LINE__,status);
1166
1167 if ( (status & RXSTATUS_ABORT_RECEIVED) &&
1168 info->loopmode_insert_requested &&
1169 usc_loopmode_active(info) )
1170 {
1171 ++info->icount.rxabort;
1172 info->loopmode_insert_requested = false;
1173
1174 /* clear CMR:13 to start echoing RxD to TxD */
1175 info->cmr_value &= ~BIT13;
1176 usc_OutReg(info, CMR, info->cmr_value);
1177
1178 /* disable received abort irq (no longer required) */
1179 usc_OutReg(info, RICR,
1180 (usc_InReg(info, RICR) & ~RXSTATUS_ABORT_RECEIVED));
1181 }
1182
1183 if (status & (RXSTATUS_EXITED_HUNT | RXSTATUS_IDLE_RECEIVED)) {
1184 if (status & RXSTATUS_EXITED_HUNT)
1185 info->icount.exithunt++;
1186 if (status & RXSTATUS_IDLE_RECEIVED)
1187 info->icount.rxidle++;
1188 wake_up_interruptible(&info->event_wait_q);
1189 }
1190
1191 if (status & RXSTATUS_OVERRUN){
1192 info->icount.rxover++;
1193 usc_process_rxoverrun_sync( info );
1194 }
1195
1196 usc_ClearIrqPendingBits( info, RECEIVE_STATUS );
1197 usc_UnlatchRxstatusBits( info, status );
1198
1199 } /* end of mgsl_isr_receive_status() */
1200
1201 /* mgsl_isr_transmit_status()
1202 *
1203 * Service a transmit status interrupt
1204 * HDLC mode :end of transmit frame
1205 * Async mode:all data is sent
1206 * transmit status is indicated by bits in the TCSR.
1207 *
1208 * Arguments: info pointer to device instance data
1209 * Return Value: None
1210 */
1211 static void mgsl_isr_transmit_status( struct mgsl_struct *info )
1212 {
1213 u16 status = usc_InReg( info, TCSR );
1214
1215 if ( debug_level >= DEBUG_LEVEL_ISR )
1216 printk("%s(%d):mgsl_isr_transmit_status status=%04X\n",
1217 __FILE__,__LINE__,status);
1218
1219 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
1220 usc_UnlatchTxstatusBits( info, status );
1221
1222 if ( status & (TXSTATUS_UNDERRUN | TXSTATUS_ABORT_SENT) )
1223 {
1224 /* finished sending HDLC abort. This may leave */
1225 /* the TxFifo with data from the aborted frame */
1226 /* so purge the TxFifo. Also shutdown the DMA */
1227 /* channel in case there is data remaining in */
1228 /* the DMA buffer */
1229 usc_DmaCmd( info, DmaCmd_ResetTxChannel );
1230 usc_RTCmd( info, RTCmd_PurgeTxFifo );
1231 }
1232
1233 if ( status & TXSTATUS_EOF_SENT )
1234 info->icount.txok++;
1235 else if ( status & TXSTATUS_UNDERRUN )
1236 info->icount.txunder++;
1237 else if ( status & TXSTATUS_ABORT_SENT )
1238 info->icount.txabort++;
1239 else
1240 info->icount.txunder++;
1241
1242 info->tx_active = false;
1243 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1244 del_timer(&info->tx_timer);
1245
1246 if ( info->drop_rts_on_tx_done ) {
1247 usc_get_serial_signals( info );
1248 if ( info->serial_signals & SerialSignal_RTS ) {
1249 info->serial_signals &= ~SerialSignal_RTS;
1250 usc_set_serial_signals( info );
1251 }
1252 info->drop_rts_on_tx_done = false;
1253 }
1254
1255 #if SYNCLINK_GENERIC_HDLC
1256 if (info->netcount)
1257 hdlcdev_tx_done(info);
1258 else
1259 #endif
1260 {
1261 if (info->port.tty->stopped || info->port.tty->hw_stopped) {
1262 usc_stop_transmitter(info);
1263 return;
1264 }
1265 info->pending_bh |= BH_TRANSMIT;
1266 }
1267
1268 } /* end of mgsl_isr_transmit_status() */
1269
1270 /* mgsl_isr_io_pin()
1271 *
1272 * Service an Input/Output pin interrupt. The type of
1273 * interrupt is indicated by bits in the MISR
1274 *
1275 * Arguments: info pointer to device instance data
1276 * Return Value: None
1277 */
1278 static void mgsl_isr_io_pin( struct mgsl_struct *info )
1279 {
1280 struct mgsl_icount *icount;
1281 u16 status = usc_InReg( info, MISR );
1282
1283 if ( debug_level >= DEBUG_LEVEL_ISR )
1284 printk("%s(%d):mgsl_isr_io_pin status=%04X\n",
1285 __FILE__,__LINE__,status);
1286
1287 usc_ClearIrqPendingBits( info, IO_PIN );
1288 usc_UnlatchIostatusBits( info, status );
1289
1290 if (status & (MISCSTATUS_CTS_LATCHED | MISCSTATUS_DCD_LATCHED |
1291 MISCSTATUS_DSR_LATCHED | MISCSTATUS_RI_LATCHED) ) {
1292 icount = &info->icount;
1293 /* update input line counters */
1294 if (status & MISCSTATUS_RI_LATCHED) {
1295 if ((info->ri_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1296 usc_DisablestatusIrqs(info,SICR_RI);
1297 icount->rng++;
1298 if ( status & MISCSTATUS_RI )
1299 info->input_signal_events.ri_up++;
1300 else
1301 info->input_signal_events.ri_down++;
1302 }
1303 if (status & MISCSTATUS_DSR_LATCHED) {
1304 if ((info->dsr_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1305 usc_DisablestatusIrqs(info,SICR_DSR);
1306 icount->dsr++;
1307 if ( status & MISCSTATUS_DSR )
1308 info->input_signal_events.dsr_up++;
1309 else
1310 info->input_signal_events.dsr_down++;
1311 }
1312 if (status & MISCSTATUS_DCD_LATCHED) {
1313 if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1314 usc_DisablestatusIrqs(info,SICR_DCD);
1315 icount->dcd++;
1316 if (status & MISCSTATUS_DCD) {
1317 info->input_signal_events.dcd_up++;
1318 } else
1319 info->input_signal_events.dcd_down++;
1320 #if SYNCLINK_GENERIC_HDLC
1321 if (info->netcount) {
1322 if (status & MISCSTATUS_DCD)
1323 netif_carrier_on(info->netdev);
1324 else
1325 netif_carrier_off(info->netdev);
1326 }
1327 #endif
1328 }
1329 if (status & MISCSTATUS_CTS_LATCHED)
1330 {
1331 if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1332 usc_DisablestatusIrqs(info,SICR_CTS);
1333 icount->cts++;
1334 if ( status & MISCSTATUS_CTS )
1335 info->input_signal_events.cts_up++;
1336 else
1337 info->input_signal_events.cts_down++;
1338 }
1339 wake_up_interruptible(&info->status_event_wait_q);
1340 wake_up_interruptible(&info->event_wait_q);
1341
1342 if (tty_port_check_carrier(&info->port) &&
1343 (status & MISCSTATUS_DCD_LATCHED) ) {
1344 if ( debug_level >= DEBUG_LEVEL_ISR )
1345 printk("%s CD now %s...", info->device_name,
1346 (status & MISCSTATUS_DCD) ? "on" : "off");
1347 if (status & MISCSTATUS_DCD)
1348 wake_up_interruptible(&info->port.open_wait);
1349 else {
1350 if ( debug_level >= DEBUG_LEVEL_ISR )
1351 printk("doing serial hangup...");
1352 if (info->port.tty)
1353 tty_hangup(info->port.tty);
1354 }
1355 }
1356
1357 if (tty_port_cts_enabled(&info->port) &&
1358 (status & MISCSTATUS_CTS_LATCHED) ) {
1359 if (info->port.tty->hw_stopped) {
1360 if (status & MISCSTATUS_CTS) {
1361 if ( debug_level >= DEBUG_LEVEL_ISR )
1362 printk("CTS tx start...");
1363 info->port.tty->hw_stopped = 0;
1364 usc_start_transmitter(info);
1365 info->pending_bh |= BH_TRANSMIT;
1366 return;
1367 }
1368 } else {
1369 if (!(status & MISCSTATUS_CTS)) {
1370 if ( debug_level >= DEBUG_LEVEL_ISR )
1371 printk("CTS tx stop...");
1372 if (info->port.tty)
1373 info->port.tty->hw_stopped = 1;
1374 usc_stop_transmitter(info);
1375 }
1376 }
1377 }
1378 }
1379
1380 info->pending_bh |= BH_STATUS;
1381
1382 /* for diagnostics set IRQ flag */
1383 if ( status & MISCSTATUS_TXC_LATCHED ){
1384 usc_OutReg( info, SICR,
1385 (unsigned short)(usc_InReg(info,SICR) & ~(SICR_TXC_ACTIVE+SICR_TXC_INACTIVE)) );
1386 usc_UnlatchIostatusBits( info, MISCSTATUS_TXC_LATCHED );
1387 info->irq_occurred = true;
1388 }
1389
1390 } /* end of mgsl_isr_io_pin() */
1391
1392 /* mgsl_isr_transmit_data()
1393 *
1394 * Service a transmit data interrupt (async mode only).
1395 *
1396 * Arguments: info pointer to device instance data
1397 * Return Value: None
1398 */
1399 static void mgsl_isr_transmit_data( struct mgsl_struct *info )
1400 {
1401 if ( debug_level >= DEBUG_LEVEL_ISR )
1402 printk("%s(%d):mgsl_isr_transmit_data xmit_cnt=%d\n",
1403 __FILE__,__LINE__,info->xmit_cnt);
1404
1405 usc_ClearIrqPendingBits( info, TRANSMIT_DATA );
1406
1407 if (info->port.tty->stopped || info->port.tty->hw_stopped) {
1408 usc_stop_transmitter(info);
1409 return;
1410 }
1411
1412 if ( info->xmit_cnt )
1413 usc_load_txfifo( info );
1414 else
1415 info->tx_active = false;
1416
1417 if (info->xmit_cnt < WAKEUP_CHARS)
1418 info->pending_bh |= BH_TRANSMIT;
1419
1420 } /* end of mgsl_isr_transmit_data() */
1421
1422 /* mgsl_isr_receive_data()
1423 *
1424 * Service a receive data interrupt. This occurs
1425 * when operating in asynchronous interrupt transfer mode.
1426 * The receive data FIFO is flushed to the receive data buffers.
1427 *
1428 * Arguments: info pointer to device instance data
1429 * Return Value: None
1430 */
1431 static void mgsl_isr_receive_data( struct mgsl_struct *info )
1432 {
1433 int Fifocount;
1434 u16 status;
1435 int work = 0;
1436 unsigned char DataByte;
1437 struct mgsl_icount *icount = &info->icount;
1438
1439 if ( debug_level >= DEBUG_LEVEL_ISR )
1440 printk("%s(%d):mgsl_isr_receive_data\n",
1441 __FILE__,__LINE__);
1442
1443 usc_ClearIrqPendingBits( info, RECEIVE_DATA );
1444
1445 /* select FIFO status for RICR readback */
1446 usc_RCmd( info, RCmd_SelectRicrRxFifostatus );
1447
1448 /* clear the Wordstatus bit so that status readback */
1449 /* only reflects the status of this byte */
1450 usc_OutReg( info, RICR+LSBONLY, (u16)(usc_InReg(info, RICR+LSBONLY) & ~BIT3 ));
1451
1452 /* flush the receive FIFO */
1453
1454 while( (Fifocount = (usc_InReg(info,RICR) >> 8)) ) {
1455 int flag;
1456
1457 /* read one byte from RxFIFO */
1458 outw( (inw(info->io_base + CCAR) & 0x0780) | (RDR+LSBONLY),
1459 info->io_base + CCAR );
1460 DataByte = inb( info->io_base + CCAR );
1461
1462 /* get the status of the received byte */
1463 status = usc_InReg(info, RCSR);
1464 if ( status & (RXSTATUS_FRAMING_ERROR | RXSTATUS_PARITY_ERROR |
1465 RXSTATUS_OVERRUN | RXSTATUS_BREAK_RECEIVED) )
1466 usc_UnlatchRxstatusBits(info,RXSTATUS_ALL);
1467
1468 icount->rx++;
1469
1470 flag = 0;
1471 if ( status & (RXSTATUS_FRAMING_ERROR | RXSTATUS_PARITY_ERROR |
1472 RXSTATUS_OVERRUN | RXSTATUS_BREAK_RECEIVED) ) {
1473 printk("rxerr=%04X\n",status);
1474 /* update error statistics */
1475 if ( status & RXSTATUS_BREAK_RECEIVED ) {
1476 status &= ~(RXSTATUS_FRAMING_ERROR | RXSTATUS_PARITY_ERROR);
1477 icount->brk++;
1478 } else if (status & RXSTATUS_PARITY_ERROR)
1479 icount->parity++;
1480 else if (status & RXSTATUS_FRAMING_ERROR)
1481 icount->frame++;
1482 else if (status & RXSTATUS_OVERRUN) {
1483 /* must issue purge fifo cmd before */
1484 /* 16C32 accepts more receive chars */
1485 usc_RTCmd(info,RTCmd_PurgeRxFifo);
1486 icount->overrun++;
1487 }
1488
1489 /* discard char if tty control flags say so */
1490 if (status & info->ignore_status_mask)
1491 continue;
1492
1493 status &= info->read_status_mask;
1494
1495 if (status & RXSTATUS_BREAK_RECEIVED) {
1496 flag = TTY_BREAK;
1497 if (info->port.flags & ASYNC_SAK)
1498 do_SAK(info->port.tty);
1499 } else if (status & RXSTATUS_PARITY_ERROR)
1500 flag = TTY_PARITY;
1501 else if (status & RXSTATUS_FRAMING_ERROR)
1502 flag = TTY_FRAME;
1503 } /* end of if (error) */
1504 tty_insert_flip_char(&info->port, DataByte, flag);
1505 if (status & RXSTATUS_OVERRUN) {
1506 /* Overrun is special, since it's
1507 * reported immediately, and doesn't
1508 * affect the current character
1509 */
1510 work += tty_insert_flip_char(&info->port, 0, TTY_OVERRUN);
1511 }
1512 }
1513
1514 if ( debug_level >= DEBUG_LEVEL_ISR ) {
1515 printk("%s(%d):rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
1516 __FILE__,__LINE__,icount->rx,icount->brk,
1517 icount->parity,icount->frame,icount->overrun);
1518 }
1519
1520 if(work)
1521 tty_flip_buffer_push(&info->port);
1522 }
1523
1524 /* mgsl_isr_misc()
1525 *
1526 * Service a miscellaneous interrupt source.
1527 *
1528 * Arguments: info pointer to device extension (instance data)
1529 * Return Value: None
1530 */
1531 static void mgsl_isr_misc( struct mgsl_struct *info )
1532 {
1533 u16 status = usc_InReg( info, MISR );
1534
1535 if ( debug_level >= DEBUG_LEVEL_ISR )
1536 printk("%s(%d):mgsl_isr_misc status=%04X\n",
1537 __FILE__,__LINE__,status);
1538
1539 if ((status & MISCSTATUS_RCC_UNDERRUN) &&
1540 (info->params.mode == MGSL_MODE_HDLC)) {
1541
1542 /* turn off receiver and rx DMA */
1543 usc_EnableReceiver(info,DISABLE_UNCONDITIONAL);
1544 usc_DmaCmd(info, DmaCmd_ResetRxChannel);
1545 usc_UnlatchRxstatusBits(info, RXSTATUS_ALL);
1546 usc_ClearIrqPendingBits(info, RECEIVE_DATA | RECEIVE_STATUS);
1547 usc_DisableInterrupts(info, RECEIVE_DATA | RECEIVE_STATUS);
1548
1549 /* schedule BH handler to restart receiver */
1550 info->pending_bh |= BH_RECEIVE;
1551 info->rx_rcc_underrun = true;
1552 }
1553
1554 usc_ClearIrqPendingBits( info, MISC );
1555 usc_UnlatchMiscstatusBits( info, status );
1556
1557 } /* end of mgsl_isr_misc() */
1558
1559 /* mgsl_isr_null()
1560 *
1561 * Services undefined interrupt vectors from the
1562 * USC. (hence this function SHOULD never be called)
1563 *
1564 * Arguments: info pointer to device extension (instance data)
1565 * Return Value: None
1566 */
1567 static void mgsl_isr_null( struct mgsl_struct *info )
1568 {
1569
1570 } /* end of mgsl_isr_null() */
1571
1572 /* mgsl_isr_receive_dma()
1573 *
1574 * Service a receive DMA channel interrupt.
1575 * For this driver there are two sources of receive DMA interrupts
1576 * as identified in the Receive DMA mode Register (RDMR):
1577 *
1578 * BIT3 EOA/EOL End of List, all receive buffers in receive
1579 * buffer list have been filled (no more free buffers
1580 * available). The DMA controller has shut down.
1581 *
1582 * BIT2 EOB End of Buffer. This interrupt occurs when a receive
1583 * DMA buffer is terminated in response to completion
1584 * of a good frame or a frame with errors. The status
1585 * of the frame is stored in the buffer entry in the
1586 * list of receive buffer entries.
1587 *
1588 * Arguments: info pointer to device instance data
1589 * Return Value: None
1590 */
1591 static void mgsl_isr_receive_dma( struct mgsl_struct *info )
1592 {
1593 u16 status;
1594
1595 /* clear interrupt pending and IUS bit for Rx DMA IRQ */
1596 usc_OutDmaReg( info, CDIR, BIT9 | BIT1 );
1597
1598 /* Read the receive DMA status to identify interrupt type. */
1599 /* This also clears the status bits. */
1600 status = usc_InDmaReg( info, RDMR );
1601
1602 if ( debug_level >= DEBUG_LEVEL_ISR )
1603 printk("%s(%d):mgsl_isr_receive_dma(%s) status=%04X\n",
1604 __FILE__,__LINE__,info->device_name,status);
1605
1606 info->pending_bh |= BH_RECEIVE;
1607
1608 if ( status & BIT3 ) {
1609 info->rx_overflow = true;
1610 info->icount.buf_overrun++;
1611 }
1612
1613 } /* end of mgsl_isr_receive_dma() */
1614
1615 /* mgsl_isr_transmit_dma()
1616 *
1617 * This function services a transmit DMA channel interrupt.
1618 *
1619 * For this driver there is one source of transmit DMA interrupts
1620 * as identified in the Transmit DMA Mode Register (TDMR):
1621 *
1622 * BIT2 EOB End of Buffer. This interrupt occurs when a
1623 * transmit DMA buffer has been emptied.
1624 *
1625 * The driver maintains enough transmit DMA buffers to hold at least
1626 * one max frame size transmit frame. When operating in a buffered
1627 * transmit mode, there may be enough transmit DMA buffers to hold at
1628 * least two or more max frame size frames. On an EOB condition,
1629 * determine if there are any queued transmit buffers and copy into
1630 * transmit DMA buffers if we have room.
1631 *
1632 * Arguments: info pointer to device instance data
1633 * Return Value: None
1634 */
1635 static void mgsl_isr_transmit_dma( struct mgsl_struct *info )
1636 {
1637 u16 status;
1638
1639 /* clear interrupt pending and IUS bit for Tx DMA IRQ */
1640 usc_OutDmaReg(info, CDIR, BIT8 | BIT0 );
1641
1642 /* Read the transmit DMA status to identify interrupt type. */
1643 /* This also clears the status bits. */
1644
1645 status = usc_InDmaReg( info, TDMR );
1646
1647 if ( debug_level >= DEBUG_LEVEL_ISR )
1648 printk("%s(%d):mgsl_isr_transmit_dma(%s) status=%04X\n",
1649 __FILE__,__LINE__,info->device_name,status);
1650
1651 if ( status & BIT2 ) {
1652 --info->tx_dma_buffers_used;
1653
1654 /* if there are transmit frames queued,
1655 * try to load the next one
1656 */
1657 if ( load_next_tx_holding_buffer(info) ) {
1658 /* if call returns non-zero value, we have
1659 * at least one free tx holding buffer
1660 */
1661 info->pending_bh |= BH_TRANSMIT;
1662 }
1663 }
1664
1665 } /* end of mgsl_isr_transmit_dma() */
1666
1667 /* mgsl_interrupt()
1668 *
1669 * Interrupt service routine entry point.
1670 *
1671 * Arguments:
1672 *
1673 * irq interrupt number that caused interrupt
1674 * dev_id device ID supplied during interrupt registration
1675 *
1676 * Return Value: None
1677 */
1678 static irqreturn_t mgsl_interrupt(int dummy, void *dev_id)
1679 {
1680 struct mgsl_struct *info = dev_id;
1681 u16 UscVector;
1682 u16 DmaVector;
1683
1684 if ( debug_level >= DEBUG_LEVEL_ISR )
1685 printk(KERN_DEBUG "%s(%d):mgsl_interrupt(%d)entry.\n",
1686 __FILE__, __LINE__, info->irq_level);
1687
1688 spin_lock(&info->irq_spinlock);
1689
1690 for(;;) {
1691 /* Read the interrupt vectors from hardware. */
1692 UscVector = usc_InReg(info, IVR) >> 9;
1693 DmaVector = usc_InDmaReg(info, DIVR);
1694
1695 if ( debug_level >= DEBUG_LEVEL_ISR )
1696 printk("%s(%d):%s UscVector=%08X DmaVector=%08X\n",
1697 __FILE__,__LINE__,info->device_name,UscVector,DmaVector);
1698
1699 if ( !UscVector && !DmaVector )
1700 break;
1701
1702 /* Dispatch interrupt vector */
1703 if ( UscVector )
1704 (*UscIsrTable[UscVector])(info);
1705 else if ( (DmaVector&(BIT10|BIT9)) == BIT10)
1706 mgsl_isr_transmit_dma(info);
1707 else
1708 mgsl_isr_receive_dma(info);
1709
1710 if ( info->isr_overflow ) {
1711 printk(KERN_ERR "%s(%d):%s isr overflow irq=%d\n",
1712 __FILE__, __LINE__, info->device_name, info->irq_level);
1713 usc_DisableMasterIrqBit(info);
1714 usc_DisableDmaInterrupts(info,DICR_MASTER);
1715 break;
1716 }
1717 }
1718
1719 /* Request bottom half processing if there's something
1720 * for it to do and the bh is not already running
1721 */
1722
1723 if ( info->pending_bh && !info->bh_running && !info->bh_requested ) {
1724 if ( debug_level >= DEBUG_LEVEL_ISR )
1725 printk("%s(%d):%s queueing bh task.\n",
1726 __FILE__,__LINE__,info->device_name);
1727 schedule_work(&info->task);
1728 info->bh_requested = true;
1729 }
1730
1731 spin_unlock(&info->irq_spinlock);
1732
1733 if ( debug_level >= DEBUG_LEVEL_ISR )
1734 printk(KERN_DEBUG "%s(%d):mgsl_interrupt(%d)exit.\n",
1735 __FILE__, __LINE__, info->irq_level);
1736
1737 return IRQ_HANDLED;
1738 } /* end of mgsl_interrupt() */
1739
1740 /* startup()
1741 *
1742 * Initialize and start device.
1743 *
1744 * Arguments: info pointer to device instance data
1745 * Return Value: 0 if success, otherwise error code
1746 */
1747 static int startup(struct mgsl_struct * info)
1748 {
1749 int retval = 0;
1750
1751 if ( debug_level >= DEBUG_LEVEL_INFO )
1752 printk("%s(%d):mgsl_startup(%s)\n",__FILE__,__LINE__,info->device_name);
1753
1754 if (tty_port_initialized(&info->port))
1755 return 0;
1756
1757 if (!info->xmit_buf) {
1758 /* allocate a page of memory for a transmit buffer */
1759 info->xmit_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);
1760 if (!info->xmit_buf) {
1761 printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
1762 __FILE__,__LINE__,info->device_name);
1763 return -ENOMEM;
1764 }
1765 }
1766
1767 info->pending_bh = 0;
1768
1769 memset(&info->icount, 0, sizeof(info->icount));
1770
1771 timer_setup(&info->tx_timer, mgsl_tx_timeout, 0);
1772
1773 /* Allocate and claim adapter resources */
1774 retval = mgsl_claim_resources(info);
1775
1776 /* perform existence check and diagnostics */
1777 if ( !retval )
1778 retval = mgsl_adapter_test(info);
1779
1780 if ( retval ) {
1781 if (capable(CAP_SYS_ADMIN) && info->port.tty)
1782 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
1783 mgsl_release_resources(info);
1784 return retval;
1785 }
1786
1787 /* program hardware for current parameters */
1788 mgsl_change_params(info);
1789
1790 if (info->port.tty)
1791 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
1792
1793 tty_port_set_initialized(&info->port, 1);
1794
1795 return 0;
1796 } /* end of startup() */
1797
1798 /* shutdown()
1799 *
1800 * Called by mgsl_close() and mgsl_hangup() to shutdown hardware
1801 *
1802 * Arguments: info pointer to device instance data
1803 * Return Value: None
1804 */
1805 static void shutdown(struct mgsl_struct * info)
1806 {
1807 unsigned long flags;
1808
1809 if (!tty_port_initialized(&info->port))
1810 return;
1811
1812 if (debug_level >= DEBUG_LEVEL_INFO)
1813 printk("%s(%d):mgsl_shutdown(%s)\n",
1814 __FILE__,__LINE__, info->device_name );
1815
1816 /* clear status wait queue because status changes */
1817 /* can't happen after shutting down the hardware */
1818 wake_up_interruptible(&info->status_event_wait_q);
1819 wake_up_interruptible(&info->event_wait_q);
1820
1821 del_timer_sync(&info->tx_timer);
1822
1823 if (info->xmit_buf) {
1824 free_page((unsigned long) info->xmit_buf);
1825 info->xmit_buf = NULL;
1826 }
1827
1828 spin_lock_irqsave(&info->irq_spinlock,flags);
1829 usc_DisableMasterIrqBit(info);
1830 usc_stop_receiver(info);
1831 usc_stop_transmitter(info);
1832 usc_DisableInterrupts(info,RECEIVE_DATA | RECEIVE_STATUS |
1833 TRANSMIT_DATA | TRANSMIT_STATUS | IO_PIN | MISC );
1834 usc_DisableDmaInterrupts(info,DICR_MASTER + DICR_TRANSMIT + DICR_RECEIVE);
1835
1836 /* Disable DMAEN (Port 7, Bit 14) */
1837 /* This disconnects the DMA request signal from the ISA bus */
1838 /* on the ISA adapter. This has no effect for the PCI adapter */
1839 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT15) | BIT14));
1840
1841 /* Disable INTEN (Port 6, Bit12) */
1842 /* This disconnects the IRQ request signal to the ISA bus */
1843 /* on the ISA adapter. This has no effect for the PCI adapter */
1844 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT13) | BIT12));
1845
1846 if (!info->port.tty || info->port.tty->termios.c_cflag & HUPCL) {
1847 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
1848 usc_set_serial_signals(info);
1849 }
1850
1851 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1852
1853 mgsl_release_resources(info);
1854
1855 if (info->port.tty)
1856 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
1857
1858 tty_port_set_initialized(&info->port, 0);
1859 } /* end of shutdown() */
1860
1861 static void mgsl_program_hw(struct mgsl_struct *info)
1862 {
1863 unsigned long flags;
1864
1865 spin_lock_irqsave(&info->irq_spinlock,flags);
1866
1867 usc_stop_receiver(info);
1868 usc_stop_transmitter(info);
1869 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1870
1871 if (info->params.mode == MGSL_MODE_HDLC ||
1872 info->params.mode == MGSL_MODE_RAW ||
1873 info->netcount)
1874 usc_set_sync_mode(info);
1875 else
1876 usc_set_async_mode(info);
1877
1878 usc_set_serial_signals(info);
1879
1880 info->dcd_chkcount = 0;
1881 info->cts_chkcount = 0;
1882 info->ri_chkcount = 0;
1883 info->dsr_chkcount = 0;
1884
1885 usc_EnableStatusIrqs(info,SICR_CTS+SICR_DSR+SICR_DCD+SICR_RI);
1886 usc_EnableInterrupts(info, IO_PIN);
1887 usc_get_serial_signals(info);
1888
1889 if (info->netcount || info->port.tty->termios.c_cflag & CREAD)
1890 usc_start_receiver(info);
1891
1892 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1893 }
1894
1895 /* Reconfigure adapter based on new parameters
1896 */
1897 static void mgsl_change_params(struct mgsl_struct *info)
1898 {
1899 unsigned cflag;
1900 int bits_per_char;
1901
1902 if (!info->port.tty)
1903 return;
1904
1905 if (debug_level >= DEBUG_LEVEL_INFO)
1906 printk("%s(%d):mgsl_change_params(%s)\n",
1907 __FILE__,__LINE__, info->device_name );
1908
1909 cflag = info->port.tty->termios.c_cflag;
1910
1911 /* if B0 rate (hangup) specified then negate RTS and DTR */
1912 /* otherwise assert RTS and DTR */
1913 if (cflag & CBAUD)
1914 info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
1915 else
1916 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
1917
1918 /* byte size and parity */
1919
1920 switch (cflag & CSIZE) {
1921 case CS5: info->params.data_bits = 5; break;
1922 case CS6: info->params.data_bits = 6; break;
1923 case CS7: info->params.data_bits = 7; break;
1924 case CS8: info->params.data_bits = 8; break;
1925 /* Never happens, but GCC is too dumb to figure it out */
1926 default: info->params.data_bits = 7; break;
1927 }
1928
1929 if (cflag & CSTOPB)
1930 info->params.stop_bits = 2;
1931 else
1932 info->params.stop_bits = 1;
1933
1934 info->params.parity = ASYNC_PARITY_NONE;
1935 if (cflag & PARENB) {
1936 if (cflag & PARODD)
1937 info->params.parity = ASYNC_PARITY_ODD;
1938 else
1939 info->params.parity = ASYNC_PARITY_EVEN;
1940 #ifdef CMSPAR
1941 if (cflag & CMSPAR)
1942 info->params.parity = ASYNC_PARITY_SPACE;
1943 #endif
1944 }
1945
1946 /* calculate number of jiffies to transmit a full
1947 * FIFO (32 bytes) at specified data rate
1948 */
1949 bits_per_char = info->params.data_bits +
1950 info->params.stop_bits + 1;
1951
1952 /* if port data rate is set to 460800 or less then
1953 * allow tty settings to override, otherwise keep the
1954 * current data rate.
1955 */
1956 if (info->params.data_rate <= 460800)
1957 info->params.data_rate = tty_get_baud_rate(info->port.tty);
1958
1959 if ( info->params.data_rate ) {
1960 info->timeout = (32*HZ*bits_per_char) /
1961 info->params.data_rate;
1962 }
1963 info->timeout += HZ/50; /* Add .02 seconds of slop */
1964
1965 tty_port_set_cts_flow(&info->port, cflag & CRTSCTS);
1966 tty_port_set_check_carrier(&info->port, ~cflag & CLOCAL);
1967
1968 /* process tty input control flags */
1969
1970 info->read_status_mask = RXSTATUS_OVERRUN;
1971 if (I_INPCK(info->port.tty))
1972 info->read_status_mask |= RXSTATUS_PARITY_ERROR | RXSTATUS_FRAMING_ERROR;
1973 if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
1974 info->read_status_mask |= RXSTATUS_BREAK_RECEIVED;
1975
1976 if (I_IGNPAR(info->port.tty))
1977 info->ignore_status_mask |= RXSTATUS_PARITY_ERROR | RXSTATUS_FRAMING_ERROR;
1978 if (I_IGNBRK(info->port.tty)) {
1979 info->ignore_status_mask |= RXSTATUS_BREAK_RECEIVED;
1980 /* If ignoring parity and break indicators, ignore
1981 * overruns too. (For real raw support).
1982 */
1983 if (I_IGNPAR(info->port.tty))
1984 info->ignore_status_mask |= RXSTATUS_OVERRUN;
1985 }
1986
1987 mgsl_program_hw(info);
1988
1989 } /* end of mgsl_change_params() */
1990
1991 /* mgsl_put_char()
1992 *
1993 * Add a character to the transmit buffer.
1994 *
1995 * Arguments: tty pointer to tty information structure
1996 * ch character to add to transmit buffer
1997 *
1998 * Return Value: None
1999 */
2000 static int mgsl_put_char(struct tty_struct *tty, unsigned char ch)
2001 {
2002 struct mgsl_struct *info = tty->driver_data;
2003 unsigned long flags;
2004 int ret = 0;
2005
2006 if (debug_level >= DEBUG_LEVEL_INFO) {
2007 printk(KERN_DEBUG "%s(%d):mgsl_put_char(%d) on %s\n",
2008 __FILE__, __LINE__, ch, info->device_name);
2009 }
2010
2011 if (mgsl_paranoia_check(info, tty->name, "mgsl_put_char"))
2012 return 0;
2013
2014 if (!info->xmit_buf)
2015 return 0;
2016
2017 spin_lock_irqsave(&info->irq_spinlock, flags);
2018
2019 if ((info->params.mode == MGSL_MODE_ASYNC ) || !info->tx_active) {
2020 if (info->xmit_cnt < SERIAL_XMIT_SIZE - 1) {
2021 info->xmit_buf[info->xmit_head++] = ch;
2022 info->xmit_head &= SERIAL_XMIT_SIZE-1;
2023 info->xmit_cnt++;
2024 ret = 1;
2025 }
2026 }
2027 spin_unlock_irqrestore(&info->irq_spinlock, flags);
2028 return ret;
2029
2030 } /* end of mgsl_put_char() */
2031
2032 /* mgsl_flush_chars()
2033 *
2034 * Enable transmitter so remaining characters in the
2035 * transmit buffer are sent.
2036 *
2037 * Arguments: tty pointer to tty information structure
2038 * Return Value: None
2039 */
2040 static void mgsl_flush_chars(struct tty_struct *tty)
2041 {
2042 struct mgsl_struct *info = tty->driver_data;
2043 unsigned long flags;
2044
2045 if ( debug_level >= DEBUG_LEVEL_INFO )
2046 printk( "%s(%d):mgsl_flush_chars() entry on %s xmit_cnt=%d\n",
2047 __FILE__,__LINE__,info->device_name,info->xmit_cnt);
2048
2049 if (mgsl_paranoia_check(info, tty->name, "mgsl_flush_chars"))
2050 return;
2051
2052 if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
2053 !info->xmit_buf)
2054 return;
2055
2056 if ( debug_level >= DEBUG_LEVEL_INFO )
2057 printk( "%s(%d):mgsl_flush_chars() entry on %s starting transmitter\n",
2058 __FILE__,__LINE__,info->device_name );
2059
2060 spin_lock_irqsave(&info->irq_spinlock,flags);
2061
2062 if (!info->tx_active) {
2063 if ( (info->params.mode == MGSL_MODE_HDLC ||
2064 info->params.mode == MGSL_MODE_RAW) && info->xmit_cnt ) {
2065 /* operating in synchronous (frame oriented) mode */
2066 /* copy data from circular xmit_buf to */
2067 /* transmit DMA buffer. */
2068 mgsl_load_tx_dma_buffer(info,
2069 info->xmit_buf,info->xmit_cnt);
2070 }
2071 usc_start_transmitter(info);
2072 }
2073
2074 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2075
2076 } /* end of mgsl_flush_chars() */
2077
2078 /* mgsl_write()
2079 *
2080 * Send a block of data
2081 *
2082 * Arguments:
2083 *
2084 * tty pointer to tty information structure
2085 * buf pointer to buffer containing send data
2086 * count size of send data in bytes
2087 *
2088 * Return Value: number of characters written
2089 */
2090 static int mgsl_write(struct tty_struct * tty,
2091 const unsigned char *buf, int count)
2092 {
2093 int c, ret = 0;
2094 struct mgsl_struct *info = tty->driver_data;
2095 unsigned long flags;
2096
2097 if ( debug_level >= DEBUG_LEVEL_INFO )
2098 printk( "%s(%d):mgsl_write(%s) count=%d\n",
2099 __FILE__,__LINE__,info->device_name,count);
2100
2101 if (mgsl_paranoia_check(info, tty->name, "mgsl_write"))
2102 goto cleanup;
2103
2104 if (!info->xmit_buf)
2105 goto cleanup;
2106
2107 if ( info->params.mode == MGSL_MODE_HDLC ||
2108 info->params.mode == MGSL_MODE_RAW ) {
2109 /* operating in synchronous (frame oriented) mode */
2110 if (info->tx_active) {
2111
2112 if ( info->params.mode == MGSL_MODE_HDLC ) {
2113 ret = 0;
2114 goto cleanup;
2115 }
2116 /* transmitter is actively sending data -
2117 * if we have multiple transmit dma and
2118 * holding buffers, attempt to queue this
2119 * frame for transmission at a later time.
2120 */
2121 if (info->tx_holding_count >= info->num_tx_holding_buffers ) {
2122 /* no tx holding buffers available */
2123 ret = 0;
2124 goto cleanup;
2125 }
2126
2127 /* queue transmit frame request */
2128 ret = count;
2129 save_tx_buffer_request(info,buf,count);
2130
2131 /* if we have sufficient tx dma buffers,
2132 * load the next buffered tx request
2133 */
2134 spin_lock_irqsave(&info->irq_spinlock,flags);
2135 load_next_tx_holding_buffer(info);
2136 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2137 goto cleanup;
2138 }
2139
2140 /* if operating in HDLC LoopMode and the adapter */
2141 /* has yet to be inserted into the loop, we can't */
2142 /* transmit */
2143
2144 if ( (info->params.flags & HDLC_FLAG_HDLC_LOOPMODE) &&
2145 !usc_loopmode_active(info) )
2146 {
2147 ret = 0;
2148 goto cleanup;
2149 }
2150
2151 if ( info->xmit_cnt ) {
2152 /* Send accumulated from send_char() calls */
2153 /* as frame and wait before accepting more data. */
2154 ret = 0;
2155
2156 /* copy data from circular xmit_buf to */
2157 /* transmit DMA buffer. */
2158 mgsl_load_tx_dma_buffer(info,
2159 info->xmit_buf,info->xmit_cnt);
2160 if ( debug_level >= DEBUG_LEVEL_INFO )
2161 printk( "%s(%d):mgsl_write(%s) sync xmit_cnt flushing\n",
2162 __FILE__,__LINE__,info->device_name);
2163 } else {
2164 if ( debug_level >= DEBUG_LEVEL_INFO )
2165 printk( "%s(%d):mgsl_write(%s) sync transmit accepted\n",
2166 __FILE__,__LINE__,info->device_name);
2167 ret = count;
2168 info->xmit_cnt = count;
2169 mgsl_load_tx_dma_buffer(info,buf,count);
2170 }
2171 } else {
2172 while (1) {
2173 spin_lock_irqsave(&info->irq_spinlock,flags);
2174 c = min_t(int, count,
2175 min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
2176 SERIAL_XMIT_SIZE - info->xmit_head));
2177 if (c <= 0) {
2178 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2179 break;
2180 }
2181 memcpy(info->xmit_buf + info->xmit_head, buf, c);
2182 info->xmit_head = ((info->xmit_head + c) &
2183 (SERIAL_XMIT_SIZE-1));
2184 info->xmit_cnt += c;
2185 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2186 buf += c;
2187 count -= c;
2188 ret += c;
2189 }
2190 }
2191
2192 if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) {
2193 spin_lock_irqsave(&info->irq_spinlock,flags);
2194 if (!info->tx_active)
2195 usc_start_transmitter(info);
2196 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2197 }
2198 cleanup:
2199 if ( debug_level >= DEBUG_LEVEL_INFO )
2200 printk( "%s(%d):mgsl_write(%s) returning=%d\n",
2201 __FILE__,__LINE__,info->device_name,ret);
2202
2203 return ret;
2204
2205 } /* end of mgsl_write() */
2206
2207 /* mgsl_write_room()
2208 *
2209 * Return the count of free bytes in transmit buffer
2210 *
2211 * Arguments: tty pointer to tty info structure
2212 * Return Value: None
2213 */
2214 static int mgsl_write_room(struct tty_struct *tty)
2215 {
2216 struct mgsl_struct *info = tty->driver_data;
2217 int ret;
2218
2219 if (mgsl_paranoia_check(info, tty->name, "mgsl_write_room"))
2220 return 0;
2221 ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
2222 if (ret < 0)
2223 ret = 0;
2224
2225 if (debug_level >= DEBUG_LEVEL_INFO)
2226 printk("%s(%d):mgsl_write_room(%s)=%d\n",
2227 __FILE__,__LINE__, info->device_name,ret );
2228
2229 if ( info->params.mode == MGSL_MODE_HDLC ||
2230 info->params.mode == MGSL_MODE_RAW ) {
2231 /* operating in synchronous (frame oriented) mode */
2232 if ( info->tx_active )
2233 return 0;
2234 else
2235 return HDLC_MAX_FRAME_SIZE;
2236 }
2237
2238 return ret;
2239
2240 } /* end of mgsl_write_room() */
2241
2242 /* mgsl_chars_in_buffer()
2243 *
2244 * Return the count of bytes in transmit buffer
2245 *
2246 * Arguments: tty pointer to tty info structure
2247 * Return Value: None
2248 */
2249 static int mgsl_chars_in_buffer(struct tty_struct *tty)
2250 {
2251 struct mgsl_struct *info = tty->driver_data;
2252
2253 if (debug_level >= DEBUG_LEVEL_INFO)
2254 printk("%s(%d):mgsl_chars_in_buffer(%s)\n",
2255 __FILE__,__LINE__, info->device_name );
2256
2257 if (mgsl_paranoia_check(info, tty->name, "mgsl_chars_in_buffer"))
2258 return 0;
2259
2260 if (debug_level >= DEBUG_LEVEL_INFO)
2261 printk("%s(%d):mgsl_chars_in_buffer(%s)=%d\n",
2262 __FILE__,__LINE__, info->device_name,info->xmit_cnt );
2263
2264 if ( info->params.mode == MGSL_MODE_HDLC ||
2265 info->params.mode == MGSL_MODE_RAW ) {
2266 /* operating in synchronous (frame oriented) mode */
2267 if ( info->tx_active )
2268 return info->max_frame_size;
2269 else
2270 return 0;
2271 }
2272
2273 return info->xmit_cnt;
2274 } /* end of mgsl_chars_in_buffer() */
2275
2276 /* mgsl_flush_buffer()
2277 *
2278 * Discard all data in the send buffer
2279 *
2280 * Arguments: tty pointer to tty info structure
2281 * Return Value: None
2282 */
2283 static void mgsl_flush_buffer(struct tty_struct *tty)
2284 {
2285 struct mgsl_struct *info = tty->driver_data;
2286 unsigned long flags;
2287
2288 if (debug_level >= DEBUG_LEVEL_INFO)
2289 printk("%s(%d):mgsl_flush_buffer(%s) entry\n",
2290 __FILE__,__LINE__, info->device_name );
2291
2292 if (mgsl_paranoia_check(info, tty->name, "mgsl_flush_buffer"))
2293 return;
2294
2295 spin_lock_irqsave(&info->irq_spinlock,flags);
2296 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
2297 del_timer(&info->tx_timer);
2298 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2299
2300 tty_wakeup(tty);
2301 }
2302
2303 /* mgsl_send_xchar()
2304 *
2305 * Send a high-priority XON/XOFF character
2306 *
2307 * Arguments: tty pointer to tty info structure
2308 * ch character to send
2309 * Return Value: None
2310 */
2311 static void mgsl_send_xchar(struct tty_struct *tty, char ch)
2312 {
2313 struct mgsl_struct *info = tty->driver_data;
2314 unsigned long flags;
2315
2316 if (debug_level >= DEBUG_LEVEL_INFO)
2317 printk("%s(%d):mgsl_send_xchar(%s,%d)\n",
2318 __FILE__,__LINE__, info->device_name, ch );
2319
2320 if (mgsl_paranoia_check(info, tty->name, "mgsl_send_xchar"))
2321 return;
2322
2323 info->x_char = ch;
2324 if (ch) {
2325 /* Make sure transmit interrupts are on */
2326 spin_lock_irqsave(&info->irq_spinlock,flags);
2327 if (!info->tx_enabled)
2328 usc_start_transmitter(info);
2329 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2330 }
2331 } /* end of mgsl_send_xchar() */
2332
2333 /* mgsl_throttle()
2334 *
2335 * Signal remote device to throttle send data (our receive data)
2336 *
2337 * Arguments: tty pointer to tty info structure
2338 * Return Value: None
2339 */
2340 static void mgsl_throttle(struct tty_struct * tty)
2341 {
2342 struct mgsl_struct *info = tty->driver_data;
2343 unsigned long flags;
2344
2345 if (debug_level >= DEBUG_LEVEL_INFO)
2346 printk("%s(%d):mgsl_throttle(%s) entry\n",
2347 __FILE__,__LINE__, info->device_name );
2348
2349 if (mgsl_paranoia_check(info, tty->name, "mgsl_throttle"))
2350 return;
2351
2352 if (I_IXOFF(tty))
2353 mgsl_send_xchar(tty, STOP_CHAR(tty));
2354
2355 if (C_CRTSCTS(tty)) {
2356 spin_lock_irqsave(&info->irq_spinlock,flags);
2357 info->serial_signals &= ~SerialSignal_RTS;
2358 usc_set_serial_signals(info);
2359 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2360 }
2361 } /* end of mgsl_throttle() */
2362
2363 /* mgsl_unthrottle()
2364 *
2365 * Signal remote device to stop throttling send data (our receive data)
2366 *
2367 * Arguments: tty pointer to tty info structure
2368 * Return Value: None
2369 */
2370 static void mgsl_unthrottle(struct tty_struct * tty)
2371 {
2372 struct mgsl_struct *info = tty->driver_data;
2373 unsigned long flags;
2374
2375 if (debug_level >= DEBUG_LEVEL_INFO)
2376 printk("%s(%d):mgsl_unthrottle(%s) entry\n",
2377 __FILE__,__LINE__, info->device_name );
2378
2379 if (mgsl_paranoia_check(info, tty->name, "mgsl_unthrottle"))
2380 return;
2381
2382 if (I_IXOFF(tty)) {
2383 if (info->x_char)
2384 info->x_char = 0;
2385 else
2386 mgsl_send_xchar(tty, START_CHAR(tty));
2387 }
2388
2389 if (C_CRTSCTS(tty)) {
2390 spin_lock_irqsave(&info->irq_spinlock,flags);
2391 info->serial_signals |= SerialSignal_RTS;
2392 usc_set_serial_signals(info);
2393 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2394 }
2395
2396 } /* end of mgsl_unthrottle() */
2397
2398 /* mgsl_get_stats()
2399 *
2400 * get the current serial parameters information
2401 *
2402 * Arguments: info pointer to device instance data
2403 * user_icount pointer to buffer to hold returned stats
2404 *
2405 * Return Value: 0 if success, otherwise error code
2406 */
2407 static int mgsl_get_stats(struct mgsl_struct * info, struct mgsl_icount __user *user_icount)
2408 {
2409 int err;
2410
2411 if (debug_level >= DEBUG_LEVEL_INFO)
2412 printk("%s(%d):mgsl_get_params(%s)\n",
2413 __FILE__,__LINE__, info->device_name);
2414
2415 if (!user_icount) {
2416 memset(&info->icount, 0, sizeof(info->icount));
2417 } else {
2418 mutex_lock(&info->port.mutex);
2419 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
2420 mutex_unlock(&info->port.mutex);
2421 if (err)
2422 return -EFAULT;
2423 }
2424
2425 return 0;
2426
2427 } /* end of mgsl_get_stats() */
2428
2429 /* mgsl_get_params()
2430 *
2431 * get the current serial parameters information
2432 *
2433 * Arguments: info pointer to device instance data
2434 * user_params pointer to buffer to hold returned params
2435 *
2436 * Return Value: 0 if success, otherwise error code
2437 */
2438 static int mgsl_get_params(struct mgsl_struct * info, MGSL_PARAMS __user *user_params)
2439 {
2440 int err;
2441 if (debug_level >= DEBUG_LEVEL_INFO)
2442 printk("%s(%d):mgsl_get_params(%s)\n",
2443 __FILE__,__LINE__, info->device_name);
2444
2445 mutex_lock(&info->port.mutex);
2446 COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
2447 mutex_unlock(&info->port.mutex);
2448 if (err) {
2449 if ( debug_level >= DEBUG_LEVEL_INFO )
2450 printk( "%s(%d):mgsl_get_params(%s) user buffer copy failed\n",
2451 __FILE__,__LINE__,info->device_name);
2452 return -EFAULT;
2453 }
2454
2455 return 0;
2456
2457 } /* end of mgsl_get_params() */
2458
2459 /* mgsl_set_params()
2460 *
2461 * set the serial parameters
2462 *
2463 * Arguments:
2464 *
2465 * info pointer to device instance data
2466 * new_params user buffer containing new serial params
2467 *
2468 * Return Value: 0 if success, otherwise error code
2469 */
2470 static int mgsl_set_params(struct mgsl_struct * info, MGSL_PARAMS __user *new_params)
2471 {
2472 unsigned long flags;
2473 MGSL_PARAMS tmp_params;
2474 int err;
2475
2476 if (debug_level >= DEBUG_LEVEL_INFO)
2477 printk("%s(%d):mgsl_set_params %s\n", __FILE__,__LINE__,
2478 info->device_name );
2479 COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
2480 if (err) {
2481 if ( debug_level >= DEBUG_LEVEL_INFO )
2482 printk( "%s(%d):mgsl_set_params(%s) user buffer copy failed\n",
2483 __FILE__,__LINE__,info->device_name);
2484 return -EFAULT;
2485 }
2486
2487 mutex_lock(&info->port.mutex);
2488 spin_lock_irqsave(&info->irq_spinlock,flags);
2489 memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
2490 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2491
2492 mgsl_change_params(info);
2493 mutex_unlock(&info->port.mutex);
2494
2495 return 0;
2496
2497 } /* end of mgsl_set_params() */
2498
2499 /* mgsl_get_txidle()
2500 *
2501 * get the current transmit idle mode
2502 *
2503 * Arguments: info pointer to device instance data
2504 * idle_mode pointer to buffer to hold returned idle mode
2505 *
2506 * Return Value: 0 if success, otherwise error code
2507 */
2508 static int mgsl_get_txidle(struct mgsl_struct * info, int __user *idle_mode)
2509 {
2510 int err;
2511
2512 if (debug_level >= DEBUG_LEVEL_INFO)
2513 printk("%s(%d):mgsl_get_txidle(%s)=%d\n",
2514 __FILE__,__LINE__, info->device_name, info->idle_mode);
2515
2516 COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
2517 if (err) {
2518 if ( debug_level >= DEBUG_LEVEL_INFO )
2519 printk( "%s(%d):mgsl_get_txidle(%s) user buffer copy failed\n",
2520 __FILE__,__LINE__,info->device_name);
2521 return -EFAULT;
2522 }
2523
2524 return 0;
2525
2526 } /* end of mgsl_get_txidle() */
2527
2528 /* mgsl_set_txidle() service ioctl to set transmit idle mode
2529 *
2530 * Arguments: info pointer to device instance data
2531 * idle_mode new idle mode
2532 *
2533 * Return Value: 0 if success, otherwise error code
2534 */
2535 static int mgsl_set_txidle(struct mgsl_struct * info, int idle_mode)
2536 {
2537 unsigned long flags;
2538
2539 if (debug_level >= DEBUG_LEVEL_INFO)
2540 printk("%s(%d):mgsl_set_txidle(%s,%d)\n", __FILE__,__LINE__,
2541 info->device_name, idle_mode );
2542
2543 spin_lock_irqsave(&info->irq_spinlock,flags);
2544 info->idle_mode = idle_mode;
2545 usc_set_txidle( info );
2546 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2547 return 0;
2548
2549 } /* end of mgsl_set_txidle() */
2550
2551 /* mgsl_txenable()
2552 *
2553 * enable or disable the transmitter
2554 *
2555 * Arguments:
2556 *
2557 * info pointer to device instance data
2558 * enable 1 = enable, 0 = disable
2559 *
2560 * Return Value: 0 if success, otherwise error code
2561 */
2562 static int mgsl_txenable(struct mgsl_struct * info, int enable)
2563 {
2564 unsigned long flags;
2565
2566 if (debug_level >= DEBUG_LEVEL_INFO)
2567 printk("%s(%d):mgsl_txenable(%s,%d)\n", __FILE__,__LINE__,
2568 info->device_name, enable);
2569
2570 spin_lock_irqsave(&info->irq_spinlock,flags);
2571 if ( enable ) {
2572 if ( !info->tx_enabled ) {
2573
2574 usc_start_transmitter(info);
2575 /*--------------------------------------------------
2576 * if HDLC/SDLC Loop mode, attempt to insert the
2577 * station in the 'loop' by setting CMR:13. Upon
2578 * receipt of the next GoAhead (RxAbort) sequence,
2579 * the OnLoop indicator (CCSR:7) should go active
2580 * to indicate that we are on the loop
2581 *--------------------------------------------------*/
2582 if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
2583 usc_loopmode_insert_request( info );
2584 }
2585 } else {
2586 if ( info->tx_enabled )
2587 usc_stop_transmitter(info);
2588 }
2589 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2590 return 0;
2591
2592 } /* end of mgsl_txenable() */
2593
2594 /* mgsl_txabort() abort send HDLC frame
2595 *
2596 * Arguments: info pointer to device instance data
2597 * Return Value: 0 if success, otherwise error code
2598 */
2599 static int mgsl_txabort(struct mgsl_struct * info)
2600 {
2601 unsigned long flags;
2602
2603 if (debug_level >= DEBUG_LEVEL_INFO)
2604 printk("%s(%d):mgsl_txabort(%s)\n", __FILE__,__LINE__,
2605 info->device_name);
2606
2607 spin_lock_irqsave(&info->irq_spinlock,flags);
2608 if ( info->tx_active && info->params.mode == MGSL_MODE_HDLC )
2609 {
2610 if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
2611 usc_loopmode_cancel_transmit( info );
2612 else
2613 usc_TCmd(info,TCmd_SendAbort);
2614 }
2615 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2616 return 0;
2617
2618 } /* end of mgsl_txabort() */
2619
2620 /* mgsl_rxenable() enable or disable the receiver
2621 *
2622 * Arguments: info pointer to device instance data
2623 * enable 1 = enable, 0 = disable
2624 * Return Value: 0 if success, otherwise error code
2625 */
2626 static int mgsl_rxenable(struct mgsl_struct * info, int enable)
2627 {
2628 unsigned long flags;
2629
2630 if (debug_level >= DEBUG_LEVEL_INFO)
2631 printk("%s(%d):mgsl_rxenable(%s,%d)\n", __FILE__,__LINE__,
2632 info->device_name, enable);
2633
2634 spin_lock_irqsave(&info->irq_spinlock,flags);
2635 if ( enable ) {
2636 if ( !info->rx_enabled )
2637 usc_start_receiver(info);
2638 } else {
2639 if ( info->rx_enabled )
2640 usc_stop_receiver(info);
2641 }
2642 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2643 return 0;
2644
2645 } /* end of mgsl_rxenable() */
2646
2647 /* mgsl_wait_event() wait for specified event to occur
2648 *
2649 * Arguments: info pointer to device instance data
2650 * mask pointer to bitmask of events to wait for
2651 * Return Value: 0 if successful and bit mask updated with
2652 * of events triggerred,
2653 * otherwise error code
2654 */
2655 static int mgsl_wait_event(struct mgsl_struct * info, int __user * mask_ptr)
2656 {
2657 unsigned long flags;
2658 int s;
2659 int rc=0;
2660 struct mgsl_icount cprev, cnow;
2661 int events;
2662 int mask;
2663 struct _input_signal_events oldsigs, newsigs;
2664 DECLARE_WAITQUEUE(wait, current);
2665
2666 COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
2667 if (rc) {
2668 return -EFAULT;
2669 }
2670
2671 if (debug_level >= DEBUG_LEVEL_INFO)
2672 printk("%s(%d):mgsl_wait_event(%s,%d)\n", __FILE__,__LINE__,
2673 info->device_name, mask);
2674
2675 spin_lock_irqsave(&info->irq_spinlock,flags);
2676
2677 /* return immediately if state matches requested events */
2678 usc_get_serial_signals(info);
2679 s = info->serial_signals;
2680 events = mask &
2681 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
2682 ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
2683 ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
2684 ((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) );
2685 if (events) {
2686 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2687 goto exit;
2688 }
2689
2690 /* save current irq counts */
2691 cprev = info->icount;
2692 oldsigs = info->input_signal_events;
2693
2694 /* enable hunt and idle irqs if needed */
2695 if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2696 u16 oldreg = usc_InReg(info,RICR);
2697 u16 newreg = oldreg +
2698 (mask & MgslEvent_ExitHuntMode ? RXSTATUS_EXITED_HUNT:0) +
2699 (mask & MgslEvent_IdleReceived ? RXSTATUS_IDLE_RECEIVED:0);
2700 if (oldreg != newreg)
2701 usc_OutReg(info, RICR, newreg);
2702 }
2703
2704 set_current_state(TASK_INTERRUPTIBLE);
2705 add_wait_queue(&info->event_wait_q, &wait);
2706
2707 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2708
2709
2710 for(;;) {
2711 schedule();
2712 if (signal_pending(current)) {
2713 rc = -ERESTARTSYS;
2714 break;
2715 }
2716
2717 /* get current irq counts */
2718 spin_lock_irqsave(&info->irq_spinlock,flags);
2719 cnow = info->icount;
2720 newsigs = info->input_signal_events;
2721 set_current_state(TASK_INTERRUPTIBLE);
2722 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2723
2724 /* if no change, wait aborted for some reason */
2725 if (newsigs.dsr_up == oldsigs.dsr_up &&
2726 newsigs.dsr_down == oldsigs.dsr_down &&
2727 newsigs.dcd_up == oldsigs.dcd_up &&
2728 newsigs.dcd_down == oldsigs.dcd_down &&
2729 newsigs.cts_up == oldsigs.cts_up &&
2730 newsigs.cts_down == oldsigs.cts_down &&
2731 newsigs.ri_up == oldsigs.ri_up &&
2732 newsigs.ri_down == oldsigs.ri_down &&
2733 cnow.exithunt == cprev.exithunt &&
2734 cnow.rxidle == cprev.rxidle) {
2735 rc = -EIO;
2736 break;
2737 }
2738
2739 events = mask &
2740 ( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) +
2741 (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2742 (newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) +
2743 (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2744 (newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) +
2745 (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2746 (newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) +
2747 (newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) +
2748 (cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) +
2749 (cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) );
2750 if (events)
2751 break;
2752
2753 cprev = cnow;
2754 oldsigs = newsigs;
2755 }
2756
2757 remove_wait_queue(&info->event_wait_q, &wait);
2758 set_current_state(TASK_RUNNING);
2759
2760 if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2761 spin_lock_irqsave(&info->irq_spinlock,flags);
2762 if (!waitqueue_active(&info->event_wait_q)) {
2763 /* disable enable exit hunt mode/idle rcvd IRQs */
2764 usc_OutReg(info, RICR, usc_InReg(info,RICR) &
2765 ~(RXSTATUS_EXITED_HUNT | RXSTATUS_IDLE_RECEIVED));
2766 }
2767 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2768 }
2769 exit:
2770 if ( rc == 0 )
2771 PUT_USER(rc, events, mask_ptr);
2772
2773 return rc;
2774
2775 } /* end of mgsl_wait_event() */
2776
2777 static int modem_input_wait(struct mgsl_struct *info,int arg)
2778 {
2779 unsigned long flags;
2780 int rc;
2781 struct mgsl_icount cprev, cnow;
2782 DECLARE_WAITQUEUE(wait, current);
2783
2784 /* save current irq counts */
2785 spin_lock_irqsave(&info->irq_spinlock,flags);
2786 cprev = info->icount;
2787 add_wait_queue(&info->status_event_wait_q, &wait);
2788 set_current_state(TASK_INTERRUPTIBLE);
2789 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2790
2791 for(;;) {
2792 schedule();
2793 if (signal_pending(current)) {
2794 rc = -ERESTARTSYS;
2795 break;
2796 }
2797
2798 /* get new irq counts */
2799 spin_lock_irqsave(&info->irq_spinlock,flags);
2800 cnow = info->icount;
2801 set_current_state(TASK_INTERRUPTIBLE);
2802 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2803
2804 /* if no change, wait aborted for some reason */
2805 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2806 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
2807 rc = -EIO;
2808 break;
2809 }
2810
2811 /* check for change in caller specified modem input */
2812 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
2813 (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
2814 (arg & TIOCM_CD && cnow.dcd != cprev.dcd) ||
2815 (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
2816 rc = 0;
2817 break;
2818 }
2819
2820 cprev = cnow;
2821 }
2822 remove_wait_queue(&info->status_event_wait_q, &wait);
2823 set_current_state(TASK_RUNNING);
2824 return rc;
2825 }
2826
2827 /* return the state of the serial control and status signals
2828 */
2829 static int tiocmget(struct tty_struct *tty)
2830 {
2831 struct mgsl_struct *info = tty->driver_data;
2832 unsigned int result;
2833 unsigned long flags;
2834
2835 spin_lock_irqsave(&info->irq_spinlock,flags);
2836 usc_get_serial_signals(info);
2837 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2838
2839 result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
2840 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
2841 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
2842 ((info->serial_signals & SerialSignal_RI) ? TIOCM_RNG:0) +
2843 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
2844 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
2845
2846 if (debug_level >= DEBUG_LEVEL_INFO)
2847 printk("%s(%d):%s tiocmget() value=%08X\n",
2848 __FILE__,__LINE__, info->device_name, result );
2849 return result;
2850 }
2851
2852 /* set modem control signals (DTR/RTS)
2853 */
2854 static int tiocmset(struct tty_struct *tty,
2855 unsigned int set, unsigned int clear)
2856 {
2857 struct mgsl_struct *info = tty->driver_data;
2858 unsigned long flags;
2859
2860 if (debug_level >= DEBUG_LEVEL_INFO)
2861 printk("%s(%d):%s tiocmset(%x,%x)\n",
2862 __FILE__,__LINE__,info->device_name, set, clear);
2863
2864 if (set & TIOCM_RTS)
2865 info->serial_signals |= SerialSignal_RTS;
2866 if (set & TIOCM_DTR)
2867 info->serial_signals |= SerialSignal_DTR;
2868 if (clear & TIOCM_RTS)
2869 info->serial_signals &= ~SerialSignal_RTS;
2870 if (clear & TIOCM_DTR)
2871 info->serial_signals &= ~SerialSignal_DTR;
2872
2873 spin_lock_irqsave(&info->irq_spinlock,flags);
2874 usc_set_serial_signals(info);
2875 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2876
2877 return 0;
2878 }
2879
2880 /* mgsl_break() Set or clear transmit break condition
2881 *
2882 * Arguments: tty pointer to tty instance data
2883 * break_state -1=set break condition, 0=clear
2884 * Return Value: error code
2885 */
2886 static int mgsl_break(struct tty_struct *tty, int break_state)
2887 {
2888 struct mgsl_struct * info = tty->driver_data;
2889 unsigned long flags;
2890
2891 if (debug_level >= DEBUG_LEVEL_INFO)
2892 printk("%s(%d):mgsl_break(%s,%d)\n",
2893 __FILE__,__LINE__, info->device_name, break_state);
2894
2895 if (mgsl_paranoia_check(info, tty->name, "mgsl_break"))
2896 return -EINVAL;
2897
2898 spin_lock_irqsave(&info->irq_spinlock,flags);
2899 if (break_state == -1)
2900 usc_OutReg(info,IOCR,(u16)(usc_InReg(info,IOCR) | BIT7));
2901 else
2902 usc_OutReg(info,IOCR,(u16)(usc_InReg(info,IOCR) & ~BIT7));
2903 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2904 return 0;
2905
2906 } /* end of mgsl_break() */
2907
2908 /*
2909 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
2910 * Return: write counters to the user passed counter struct
2911 * NB: both 1->0 and 0->1 transitions are counted except for
2912 * RI where only 0->1 is counted.
2913 */
2914 static int msgl_get_icount(struct tty_struct *tty,
2915 struct serial_icounter_struct *icount)
2916
2917 {
2918 struct mgsl_struct * info = tty->driver_data;
2919 struct mgsl_icount cnow; /* kernel counter temps */
2920 unsigned long flags;
2921
2922 spin_lock_irqsave(&info->irq_spinlock,flags);
2923 cnow = info->icount;
2924 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2925
2926 icount->cts = cnow.cts;
2927 icount->dsr = cnow.dsr;
2928 icount->rng = cnow.rng;
2929 icount->dcd = cnow.dcd;
2930 icount->rx = cnow.rx;
2931 icount->tx = cnow.tx;
2932 icount->frame = cnow.frame;
2933 icount->overrun = cnow.overrun;
2934 icount->parity = cnow.parity;
2935 icount->brk = cnow.brk;
2936 icount->buf_overrun = cnow.buf_overrun;
2937 return 0;
2938 }
2939
2940 /* mgsl_ioctl() Service an IOCTL request
2941 *
2942 * Arguments:
2943 *
2944 * tty pointer to tty instance data
2945 * cmd IOCTL command code
2946 * arg command argument/context
2947 *
2948 * Return Value: 0 if success, otherwise error code
2949 */
2950 static int mgsl_ioctl(struct tty_struct *tty,
2951 unsigned int cmd, unsigned long arg)
2952 {
2953 struct mgsl_struct * info = tty->driver_data;
2954
2955 if (debug_level >= DEBUG_LEVEL_INFO)
2956 printk("%s(%d):mgsl_ioctl %s cmd=%08X\n", __FILE__,__LINE__,
2957 info->device_name, cmd );
2958
2959 if (mgsl_paranoia_check(info, tty->name, "mgsl_ioctl"))
2960 return -ENODEV;
2961
2962 if (cmd != TIOCMIWAIT) {
2963 if (tty_io_error(tty))
2964 return -EIO;
2965 }
2966
2967 return mgsl_ioctl_common(info, cmd, arg);
2968 }
2969
2970 static int mgsl_ioctl_common(struct mgsl_struct *info, unsigned int cmd, unsigned long arg)
2971 {
2972 void __user *argp = (void __user *)arg;
2973
2974 switch (cmd) {
2975 case MGSL_IOCGPARAMS:
2976 return mgsl_get_params(info, argp);
2977 case MGSL_IOCSPARAMS:
2978 return mgsl_set_params(info, argp);
2979 case MGSL_IOCGTXIDLE:
2980 return mgsl_get_txidle(info, argp);
2981 case MGSL_IOCSTXIDLE:
2982 return mgsl_set_txidle(info,(int)arg);
2983 case MGSL_IOCTXENABLE:
2984 return mgsl_txenable(info,(int)arg);
2985 case MGSL_IOCRXENABLE:
2986 return mgsl_rxenable(info,(int)arg);
2987 case MGSL_IOCTXABORT:
2988 return mgsl_txabort(info);
2989 case MGSL_IOCGSTATS:
2990 return mgsl_get_stats(info, argp);
2991 case MGSL_IOCWAITEVENT:
2992 return mgsl_wait_event(info, argp);
2993 case MGSL_IOCLOOPTXDONE:
2994 return mgsl_loopmode_send_done(info);
2995 /* Wait for modem input (DCD,RI,DSR,CTS) change
2996 * as specified by mask in arg (TIOCM_RNG/DSR/CD/CTS)
2997 */
2998 case TIOCMIWAIT:
2999 return modem_input_wait(info,(int)arg);
3000
3001 default:
3002 return -ENOIOCTLCMD;
3003 }
3004 return 0;
3005 }
3006
3007 /* mgsl_set_termios()
3008 *
3009 * Set new termios settings
3010 *
3011 * Arguments:
3012 *
3013 * tty pointer to tty structure
3014 * termios pointer to buffer to hold returned old termios
3015 *
3016 * Return Value: None
3017 */
3018 static void mgsl_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
3019 {
3020 struct mgsl_struct *info = tty->driver_data;
3021 unsigned long flags;
3022
3023 if (debug_level >= DEBUG_LEVEL_INFO)
3024 printk("%s(%d):mgsl_set_termios %s\n", __FILE__,__LINE__,
3025 tty->driver->name );
3026
3027 mgsl_change_params(info);
3028
3029 /* Handle transition to B0 status */
3030 if ((old_termios->c_cflag & CBAUD) && !C_BAUD(tty)) {
3031 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
3032 spin_lock_irqsave(&info->irq_spinlock,flags);
3033 usc_set_serial_signals(info);
3034 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3035 }
3036
3037 /* Handle transition away from B0 status */
3038 if (!(old_termios->c_cflag & CBAUD) && C_BAUD(tty)) {
3039 info->serial_signals |= SerialSignal_DTR;
3040 if (!C_CRTSCTS(tty) || !tty_throttled(tty))
3041 info->serial_signals |= SerialSignal_RTS;
3042 spin_lock_irqsave(&info->irq_spinlock,flags);
3043 usc_set_serial_signals(info);
3044 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3045 }
3046
3047 /* Handle turning off CRTSCTS */
3048 if (old_termios->c_cflag & CRTSCTS && !C_CRTSCTS(tty)) {
3049 tty->hw_stopped = 0;
3050 mgsl_start(tty);
3051 }
3052
3053 } /* end of mgsl_set_termios() */
3054
3055 /* mgsl_close()
3056 *
3057 * Called when port is closed. Wait for remaining data to be
3058 * sent. Disable port and free resources.
3059 *
3060 * Arguments:
3061 *
3062 * tty pointer to open tty structure
3063 * filp pointer to open file object
3064 *
3065 * Return Value: None
3066 */
3067 static void mgsl_close(struct tty_struct *tty, struct file * filp)
3068 {
3069 struct mgsl_struct * info = tty->driver_data;
3070
3071 if (mgsl_paranoia_check(info, tty->name, "mgsl_close"))
3072 return;
3073
3074 if (debug_level >= DEBUG_LEVEL_INFO)
3075 printk("%s(%d):mgsl_close(%s) entry, count=%d\n",
3076 __FILE__,__LINE__, info->device_name, info->port.count);
3077
3078 if (tty_port_close_start(&info->port, tty, filp) == 0)
3079 goto cleanup;
3080
3081 mutex_lock(&info->port.mutex);
3082 if (tty_port_initialized(&info->port))
3083 mgsl_wait_until_sent(tty, info->timeout);
3084 mgsl_flush_buffer(tty);
3085 tty_ldisc_flush(tty);
3086 shutdown(info);
3087 mutex_unlock(&info->port.mutex);
3088
3089 tty_port_close_end(&info->port, tty);
3090 info->port.tty = NULL;
3091 cleanup:
3092 if (debug_level >= DEBUG_LEVEL_INFO)
3093 printk("%s(%d):mgsl_close(%s) exit, count=%d\n", __FILE__,__LINE__,
3094 tty->driver->name, info->port.count);
3095
3096 } /* end of mgsl_close() */
3097
3098 /* mgsl_wait_until_sent()
3099 *
3100 * Wait until the transmitter is empty.
3101 *
3102 * Arguments:
3103 *
3104 * tty pointer to tty info structure
3105 * timeout time to wait for send completion
3106 *
3107 * Return Value: None
3108 */
3109 static void mgsl_wait_until_sent(struct tty_struct *tty, int timeout)
3110 {
3111 struct mgsl_struct * info = tty->driver_data;
3112 unsigned long orig_jiffies, char_time;
3113
3114 if (!info )
3115 return;
3116
3117 if (debug_level >= DEBUG_LEVEL_INFO)
3118 printk("%s(%d):mgsl_wait_until_sent(%s) entry\n",
3119 __FILE__,__LINE__, info->device_name );
3120
3121 if (mgsl_paranoia_check(info, tty->name, "mgsl_wait_until_sent"))
3122 return;
3123
3124 if (!tty_port_initialized(&info->port))
3125 goto exit;
3126
3127 orig_jiffies = jiffies;
3128
3129 /* Set check interval to 1/5 of estimated time to
3130 * send a character, and make it at least 1. The check
3131 * interval should also be less than the timeout.
3132 * Note: use tight timings here to satisfy the NIST-PCTS.
3133 */
3134
3135 if ( info->params.data_rate ) {
3136 char_time = info->timeout/(32 * 5);
3137 if (!char_time)
3138 char_time++;
3139 } else
3140 char_time = 1;
3141
3142 if (timeout)
3143 char_time = min_t(unsigned long, char_time, timeout);
3144
3145 if ( info->params.mode == MGSL_MODE_HDLC ||
3146 info->params.mode == MGSL_MODE_RAW ) {
3147 while (info->tx_active) {
3148 msleep_interruptible(jiffies_to_msecs(char_time));
3149 if (signal_pending(current))
3150 break;
3151 if (timeout && time_after(jiffies, orig_jiffies + timeout))
3152 break;
3153 }
3154 } else {
3155 while (!(usc_InReg(info,TCSR) & TXSTATUS_ALL_SENT) &&
3156 info->tx_enabled) {
3157 msleep_interruptible(jiffies_to_msecs(char_time));
3158 if (signal_pending(current))
3159 break;
3160 if (timeout && time_after(jiffies, orig_jiffies + timeout))
3161 break;
3162 }
3163 }
3164
3165 exit:
3166 if (debug_level >= DEBUG_LEVEL_INFO)
3167 printk("%s(%d):mgsl_wait_until_sent(%s) exit\n",
3168 __FILE__,__LINE__, info->device_name );
3169
3170 } /* end of mgsl_wait_until_sent() */
3171
3172 /* mgsl_hangup()
3173 *
3174 * Called by tty_hangup() when a hangup is signaled.
3175 * This is the same as to closing all open files for the port.
3176 *
3177 * Arguments: tty pointer to associated tty object
3178 * Return Value: None
3179 */
3180 static void mgsl_hangup(struct tty_struct *tty)
3181 {
3182 struct mgsl_struct * info = tty->driver_data;
3183
3184 if (debug_level >= DEBUG_LEVEL_INFO)
3185 printk("%s(%d):mgsl_hangup(%s)\n",
3186 __FILE__,__LINE__, info->device_name );
3187
3188 if (mgsl_paranoia_check(info, tty->name, "mgsl_hangup"))
3189 return;
3190
3191 mgsl_flush_buffer(tty);
3192 shutdown(info);
3193
3194 info->port.count = 0;
3195 tty_port_set_active(&info->port, 0);
3196 info->port.tty = NULL;
3197
3198 wake_up_interruptible(&info->port.open_wait);
3199
3200 } /* end of mgsl_hangup() */
3201
3202 /*
3203 * carrier_raised()
3204 *
3205 * Return true if carrier is raised
3206 */
3207
3208 static int carrier_raised(struct tty_port *port)
3209 {
3210 unsigned long flags;
3211 struct mgsl_struct *info = container_of(port, struct mgsl_struct, port);
3212
3213 spin_lock_irqsave(&info->irq_spinlock, flags);
3214 usc_get_serial_signals(info);
3215 spin_unlock_irqrestore(&info->irq_spinlock, flags);
3216 return (info->serial_signals & SerialSignal_DCD) ? 1 : 0;
3217 }
3218
3219 static void dtr_rts(struct tty_port *port, int on)
3220 {
3221 struct mgsl_struct *info = container_of(port, struct mgsl_struct, port);
3222 unsigned long flags;
3223
3224 spin_lock_irqsave(&info->irq_spinlock,flags);
3225 if (on)
3226 info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
3227 else
3228 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
3229 usc_set_serial_signals(info);
3230 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3231 }
3232
3233
3234 /* block_til_ready()
3235 *
3236 * Block the current process until the specified port
3237 * is ready to be opened.
3238 *
3239 * Arguments:
3240 *
3241 * tty pointer to tty info structure
3242 * filp pointer to open file object
3243 * info pointer to device instance data
3244 *
3245 * Return Value: 0 if success, otherwise error code
3246 */
3247 static int block_til_ready(struct tty_struct *tty, struct file * filp,
3248 struct mgsl_struct *info)
3249 {
3250 DECLARE_WAITQUEUE(wait, current);
3251 int retval;
3252 bool do_clocal = false;
3253 unsigned long flags;
3254 int dcd;
3255 struct tty_port *port = &info->port;
3256
3257 if (debug_level >= DEBUG_LEVEL_INFO)
3258 printk("%s(%d):block_til_ready on %s\n",
3259 __FILE__,__LINE__, tty->driver->name );
3260
3261 if (filp->f_flags & O_NONBLOCK || tty_io_error(tty)) {
3262 /* nonblock mode is set or port is not enabled */
3263 tty_port_set_active(port, 1);
3264 return 0;
3265 }
3266
3267 if (C_CLOCAL(tty))
3268 do_clocal = true;
3269
3270 /* Wait for carrier detect and the line to become
3271 * free (i.e., not in use by the callout). While we are in
3272 * this loop, port->count is dropped by one, so that
3273 * mgsl_close() knows when to free things. We restore it upon
3274 * exit, either normal or abnormal.
3275 */
3276
3277 retval = 0;
3278 add_wait_queue(&port->open_wait, &wait);
3279
3280 if (debug_level >= DEBUG_LEVEL_INFO)
3281 printk("%s(%d):block_til_ready before block on %s count=%d\n",
3282 __FILE__,__LINE__, tty->driver->name, port->count );
3283
3284 spin_lock_irqsave(&info->irq_spinlock, flags);
3285 port->count--;
3286 spin_unlock_irqrestore(&info->irq_spinlock, flags);
3287 port->blocked_open++;
3288
3289 while (1) {
3290 if (C_BAUD(tty) && tty_port_initialized(port))
3291 tty_port_raise_dtr_rts(port);
3292
3293 set_current_state(TASK_INTERRUPTIBLE);
3294
3295 if (tty_hung_up_p(filp) || !tty_port_initialized(port)) {
3296 retval = (port->flags & ASYNC_HUP_NOTIFY) ?
3297 -EAGAIN : -ERESTARTSYS;
3298 break;
3299 }
3300
3301 dcd = tty_port_carrier_raised(&info->port);
3302 if (do_clocal || dcd)
3303 break;
3304
3305 if (signal_pending(current)) {
3306 retval = -ERESTARTSYS;
3307 break;
3308 }
3309
3310 if (debug_level >= DEBUG_LEVEL_INFO)
3311 printk("%s(%d):block_til_ready blocking on %s count=%d\n",
3312 __FILE__,__LINE__, tty->driver->name, port->count );
3313
3314 tty_unlock(tty);
3315 schedule();
3316 tty_lock(tty);
3317 }
3318
3319 set_current_state(TASK_RUNNING);
3320 remove_wait_queue(&port->open_wait, &wait);
3321
3322 /* FIXME: Racy on hangup during close wait */
3323 if (!tty_hung_up_p(filp))
3324 port->count++;
3325 port->blocked_open--;
3326
3327 if (debug_level >= DEBUG_LEVEL_INFO)
3328 printk("%s(%d):block_til_ready after blocking on %s count=%d\n",
3329 __FILE__,__LINE__, tty->driver->name, port->count );
3330
3331 if (!retval)
3332 tty_port_set_active(port, 1);
3333
3334 return retval;
3335
3336 } /* end of block_til_ready() */
3337
3338 static int mgsl_install(struct tty_driver *driver, struct tty_struct *tty)
3339 {
3340 struct mgsl_struct *info;
3341 int line = tty->index;
3342
3343 /* verify range of specified line number */
3344 if (line >= mgsl_device_count) {
3345 printk("%s(%d):mgsl_open with invalid line #%d.\n",
3346 __FILE__, __LINE__, line);
3347 return -ENODEV;
3348 }
3349
3350 /* find the info structure for the specified line */
3351 info = mgsl_device_list;
3352 while (info && info->line != line)
3353 info = info->next_device;
3354 if (mgsl_paranoia_check(info, tty->name, "mgsl_open"))
3355 return -ENODEV;
3356 tty->driver_data = info;
3357
3358 return tty_port_install(&info->port, driver, tty);
3359 }
3360
3361 /* mgsl_open()
3362 *
3363 * Called when a port is opened. Init and enable port.
3364 * Perform serial-specific initialization for the tty structure.
3365 *
3366 * Arguments: tty pointer to tty info structure
3367 * filp associated file pointer
3368 *
3369 * Return Value: 0 if success, otherwise error code
3370 */
3371 static int mgsl_open(struct tty_struct *tty, struct file * filp)
3372 {
3373 struct mgsl_struct *info = tty->driver_data;
3374 unsigned long flags;
3375 int retval;
3376
3377 info->port.tty = tty;
3378
3379 if (debug_level >= DEBUG_LEVEL_INFO)
3380 printk("%s(%d):mgsl_open(%s), old ref count = %d\n",
3381 __FILE__,__LINE__,tty->driver->name, info->port.count);
3382
3383 info->port.low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
3384
3385 spin_lock_irqsave(&info->netlock, flags);
3386 if (info->netcount) {
3387 retval = -EBUSY;
3388 spin_unlock_irqrestore(&info->netlock, flags);
3389 goto cleanup;
3390 }
3391 info->port.count++;
3392 spin_unlock_irqrestore(&info->netlock, flags);
3393
3394 if (info->port.count == 1) {
3395 /* 1st open on this device, init hardware */
3396 retval = startup(info);
3397 if (retval < 0)
3398 goto cleanup;
3399 }
3400
3401 retval = block_til_ready(tty, filp, info);
3402 if (retval) {
3403 if (debug_level >= DEBUG_LEVEL_INFO)
3404 printk("%s(%d):block_til_ready(%s) returned %d\n",
3405 __FILE__,__LINE__, info->device_name, retval);
3406 goto cleanup;
3407 }
3408
3409 if (debug_level >= DEBUG_LEVEL_INFO)
3410 printk("%s(%d):mgsl_open(%s) success\n",
3411 __FILE__,__LINE__, info->device_name);
3412 retval = 0;
3413
3414 cleanup:
3415 if (retval) {
3416 if (tty->count == 1)
3417 info->port.tty = NULL; /* tty layer will release tty struct */
3418 if(info->port.count)
3419 info->port.count--;
3420 }
3421
3422 return retval;
3423
3424 } /* end of mgsl_open() */
3425
3426 /*
3427 * /proc fs routines....
3428 */
3429
3430 static inline void line_info(struct seq_file *m, struct mgsl_struct *info)
3431 {
3432 char stat_buf[30];
3433 unsigned long flags;
3434
3435 if (info->bus_type == MGSL_BUS_TYPE_PCI) {
3436 seq_printf(m, "%s:PCI io:%04X irq:%d mem:%08X lcr:%08X",
3437 info->device_name, info->io_base, info->irq_level,
3438 info->phys_memory_base, info->phys_lcr_base);
3439 } else {
3440 seq_printf(m, "%s:(E)ISA io:%04X irq:%d dma:%d",
3441 info->device_name, info->io_base,
3442 info->irq_level, info->dma_level);
3443 }
3444
3445 /* output current serial signal states */
3446 spin_lock_irqsave(&info->irq_spinlock,flags);
3447 usc_get_serial_signals(info);
3448 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3449
3450 stat_buf[0] = 0;
3451 stat_buf[1] = 0;
3452 if (info->serial_signals & SerialSignal_RTS)
3453 strcat(stat_buf, "|RTS");
3454 if (info->serial_signals & SerialSignal_CTS)
3455 strcat(stat_buf, "|CTS");
3456 if (info->serial_signals & SerialSignal_DTR)
3457 strcat(stat_buf, "|DTR");
3458 if (info->serial_signals & SerialSignal_DSR)
3459 strcat(stat_buf, "|DSR");
3460 if (info->serial_signals & SerialSignal_DCD)
3461 strcat(stat_buf, "|CD");
3462 if (info->serial_signals & SerialSignal_RI)
3463 strcat(stat_buf, "|RI");
3464
3465 if (info->params.mode == MGSL_MODE_HDLC ||
3466 info->params.mode == MGSL_MODE_RAW ) {
3467 seq_printf(m, " HDLC txok:%d rxok:%d",
3468 info->icount.txok, info->icount.rxok);
3469 if (info->icount.txunder)
3470 seq_printf(m, " txunder:%d", info->icount.txunder);
3471 if (info->icount.txabort)
3472 seq_printf(m, " txabort:%d", info->icount.txabort);
3473 if (info->icount.rxshort)
3474 seq_printf(m, " rxshort:%d", info->icount.rxshort);
3475 if (info->icount.rxlong)
3476 seq_printf(m, " rxlong:%d", info->icount.rxlong);
3477 if (info->icount.rxover)
3478 seq_printf(m, " rxover:%d", info->icount.rxover);
3479 if (info->icount.rxcrc)
3480 seq_printf(m, " rxcrc:%d", info->icount.rxcrc);
3481 } else {
3482 seq_printf(m, " ASYNC tx:%d rx:%d",
3483 info->icount.tx, info->icount.rx);
3484 if (info->icount.frame)
3485 seq_printf(m, " fe:%d", info->icount.frame);
3486 if (info->icount.parity)
3487 seq_printf(m, " pe:%d", info->icount.parity);
3488 if (info->icount.brk)
3489 seq_printf(m, " brk:%d", info->icount.brk);
3490 if (info->icount.overrun)
3491 seq_printf(m, " oe:%d", info->icount.overrun);
3492 }
3493
3494 /* Append serial signal status to end */
3495 seq_printf(m, " %s\n", stat_buf+1);
3496
3497 seq_printf(m, "txactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
3498 info->tx_active,info->bh_requested,info->bh_running,
3499 info->pending_bh);
3500
3501 spin_lock_irqsave(&info->irq_spinlock,flags);
3502 {
3503 u16 Tcsr = usc_InReg( info, TCSR );
3504 u16 Tdmr = usc_InDmaReg( info, TDMR );
3505 u16 Ticr = usc_InReg( info, TICR );
3506 u16 Rscr = usc_InReg( info, RCSR );
3507 u16 Rdmr = usc_InDmaReg( info, RDMR );
3508 u16 Ricr = usc_InReg( info, RICR );
3509 u16 Icr = usc_InReg( info, ICR );
3510 u16 Dccr = usc_InReg( info, DCCR );
3511 u16 Tmr = usc_InReg( info, TMR );
3512 u16 Tccr = usc_InReg( info, TCCR );
3513 u16 Ccar = inw( info->io_base + CCAR );
3514 seq_printf(m, "tcsr=%04X tdmr=%04X ticr=%04X rcsr=%04X rdmr=%04X\n"
3515 "ricr=%04X icr =%04X dccr=%04X tmr=%04X tccr=%04X ccar=%04X\n",
3516 Tcsr,Tdmr,Ticr,Rscr,Rdmr,Ricr,Icr,Dccr,Tmr,Tccr,Ccar );
3517 }
3518 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3519 }
3520
3521 /* Called to print information about devices */
3522 static int mgsl_proc_show(struct seq_file *m, void *v)
3523 {
3524 struct mgsl_struct *info;
3525
3526 seq_printf(m, "synclink driver:%s\n", driver_version);
3527
3528 info = mgsl_device_list;
3529 while( info ) {
3530 line_info(m, info);
3531 info = info->next_device;
3532 }
3533 return 0;
3534 }
3535
3536 /* mgsl_allocate_dma_buffers()
3537 *
3538 * Allocate and format DMA buffers (ISA adapter)
3539 * or format shared memory buffers (PCI adapter).
3540 *
3541 * Arguments: info pointer to device instance data
3542 * Return Value: 0 if success, otherwise error
3543 */
3544 static int mgsl_allocate_dma_buffers(struct mgsl_struct *info)
3545 {
3546 unsigned short BuffersPerFrame;
3547
3548 info->last_mem_alloc = 0;
3549
3550 /* Calculate the number of DMA buffers necessary to hold the */
3551 /* largest allowable frame size. Note: If the max frame size is */
3552 /* not an even multiple of the DMA buffer size then we need to */
3553 /* round the buffer count per frame up one. */
3554
3555 BuffersPerFrame = (unsigned short)(info->max_frame_size/DMABUFFERSIZE);
3556 if ( info->max_frame_size % DMABUFFERSIZE )
3557 BuffersPerFrame++;
3558
3559 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
3560 /*
3561 * The PCI adapter has 256KBytes of shared memory to use.
3562 * This is 64 PAGE_SIZE buffers.
3563 *
3564 * The first page is used for padding at this time so the
3565 * buffer list does not begin at offset 0 of the PCI
3566 * adapter's shared memory.
3567 *
3568 * The 2nd page is used for the buffer list. A 4K buffer
3569 * list can hold 128 DMA_BUFFER structures at 32 bytes
3570 * each.
3571 *
3572 * This leaves 62 4K pages.
3573 *
3574 * The next N pages are used for transmit frame(s). We
3575 * reserve enough 4K page blocks to hold the required
3576 * number of transmit dma buffers (num_tx_dma_buffers),
3577 * each of MaxFrameSize size.
3578 *
3579 * Of the remaining pages (62-N), determine how many can
3580 * be used to receive full MaxFrameSize inbound frames
3581 */
3582 info->tx_buffer_count = info->num_tx_dma_buffers * BuffersPerFrame;
3583 info->rx_buffer_count = 62 - info->tx_buffer_count;
3584 } else {
3585 /* Calculate the number of PAGE_SIZE buffers needed for */
3586 /* receive and transmit DMA buffers. */
3587
3588
3589 /* Calculate the number of DMA buffers necessary to */
3590 /* hold 7 max size receive frames and one max size transmit frame. */
3591 /* The receive buffer count is bumped by one so we avoid an */
3592 /* End of List condition if all receive buffers are used when */
3593 /* using linked list DMA buffers. */
3594
3595 info->tx_buffer_count = info->num_tx_dma_buffers * BuffersPerFrame;
3596 info->rx_buffer_count = (BuffersPerFrame * MAXRXFRAMES) + 6;
3597
3598 /*
3599 * limit total TxBuffers & RxBuffers to 62 4K total
3600 * (ala PCI Allocation)
3601 */
3602
3603 if ( (info->tx_buffer_count + info->rx_buffer_count) > 62 )
3604 info->rx_buffer_count = 62 - info->tx_buffer_count;
3605
3606 }
3607
3608 if ( debug_level >= DEBUG_LEVEL_INFO )
3609 printk("%s(%d):Allocating %d TX and %d RX DMA buffers.\n",
3610 __FILE__,__LINE__, info->tx_buffer_count,info->rx_buffer_count);
3611
3612 if ( mgsl_alloc_buffer_list_memory( info ) < 0 ||
3613 mgsl_alloc_frame_memory(info, info->rx_buffer_list, info->rx_buffer_count) < 0 ||
3614 mgsl_alloc_frame_memory(info, info->tx_buffer_list, info->tx_buffer_count) < 0 ||
3615 mgsl_alloc_intermediate_rxbuffer_memory(info) < 0 ||
3616 mgsl_alloc_intermediate_txbuffer_memory(info) < 0 ) {
3617 printk("%s(%d):Can't allocate DMA buffer memory\n",__FILE__,__LINE__);
3618 return -ENOMEM;
3619 }
3620
3621 mgsl_reset_rx_dma_buffers( info );
3622 mgsl_reset_tx_dma_buffers( info );
3623
3624 return 0;
3625
3626 } /* end of mgsl_allocate_dma_buffers() */
3627
3628 /*
3629 * mgsl_alloc_buffer_list_memory()
3630 *
3631 * Allocate a common DMA buffer for use as the
3632 * receive and transmit buffer lists.
3633 *
3634 * A buffer list is a set of buffer entries where each entry contains
3635 * a pointer to an actual buffer and a pointer to the next buffer entry
3636 * (plus some other info about the buffer).
3637 *
3638 * The buffer entries for a list are built to form a circular list so
3639 * that when the entire list has been traversed you start back at the
3640 * beginning.
3641 *
3642 * This function allocates memory for just the buffer entries.
3643 * The links (pointer to next entry) are filled in with the physical
3644 * address of the next entry so the adapter can navigate the list
3645 * using bus master DMA. The pointers to the actual buffers are filled
3646 * out later when the actual buffers are allocated.
3647 *
3648 * Arguments: info pointer to device instance data
3649 * Return Value: 0 if success, otherwise error
3650 */
3651 static int mgsl_alloc_buffer_list_memory( struct mgsl_struct *info )
3652 {
3653 unsigned int i;
3654
3655 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
3656 /* PCI adapter uses shared memory. */
3657 info->buffer_list = info->memory_base + info->last_mem_alloc;
3658 info->buffer_list_phys = info->last_mem_alloc;
3659 info->last_mem_alloc += BUFFERLISTSIZE;
3660 } else {
3661 /* ISA adapter uses system memory. */
3662 /* The buffer lists are allocated as a common buffer that both */
3663 /* the processor and adapter can access. This allows the driver to */
3664 /* inspect portions of the buffer while other portions are being */
3665 /* updated by the adapter using Bus Master DMA. */
3666
3667 info->buffer_list = dma_alloc_coherent(NULL, BUFFERLISTSIZE, &info->buffer_list_dma_addr, GFP_KERNEL);
3668 if (info->buffer_list == NULL)
3669 return -ENOMEM;
3670 info->buffer_list_phys = (u32)(info->buffer_list_dma_addr);
3671 }
3672
3673 /* We got the memory for the buffer entry lists. */
3674 /* Initialize the memory block to all zeros. */
3675 memset( info->buffer_list, 0, BUFFERLISTSIZE );
3676
3677 /* Save virtual address pointers to the receive and */
3678 /* transmit buffer lists. (Receive 1st). These pointers will */
3679 /* be used by the processor to access the lists. */
3680 info->rx_buffer_list = (DMABUFFERENTRY *)info->buffer_list;
3681 info->tx_buffer_list = (DMABUFFERENTRY *)info->buffer_list;
3682 info->tx_buffer_list += info->rx_buffer_count;
3683
3684 /*
3685 * Build the links for the buffer entry lists such that
3686 * two circular lists are built. (Transmit and Receive).
3687 *
3688 * Note: the links are physical addresses
3689 * which are read by the adapter to determine the next
3690 * buffer entry to use.
3691 */
3692
3693 for ( i = 0; i < info->rx_buffer_count; i++ ) {
3694 /* calculate and store physical address of this buffer entry */
3695 info->rx_buffer_list[i].phys_entry =
3696 info->buffer_list_phys + (i * sizeof(DMABUFFERENTRY));
3697
3698 /* calculate and store physical address of */
3699 /* next entry in cirular list of entries */
3700
3701 info->rx_buffer_list[i].link = info->buffer_list_phys;
3702
3703 if ( i < info->rx_buffer_count - 1 )
3704 info->rx_buffer_list[i].link += (i + 1) * sizeof(DMABUFFERENTRY);
3705 }
3706
3707 for ( i = 0; i < info->tx_buffer_count; i++ ) {
3708 /* calculate and store physical address of this buffer entry */
3709 info->tx_buffer_list[i].phys_entry = info->buffer_list_phys +
3710 ((info->rx_buffer_count + i) * sizeof(DMABUFFERENTRY));
3711
3712 /* calculate and store physical address of */
3713 /* next entry in cirular list of entries */
3714
3715 info->tx_buffer_list[i].link = info->buffer_list_phys +
3716 info->rx_buffer_count * sizeof(DMABUFFERENTRY);
3717
3718 if ( i < info->tx_buffer_count - 1 )
3719 info->tx_buffer_list[i].link += (i + 1) * sizeof(DMABUFFERENTRY);
3720 }
3721
3722 return 0;
3723
3724 } /* end of mgsl_alloc_buffer_list_memory() */
3725
3726 /* Free DMA buffers allocated for use as the
3727 * receive and transmit buffer lists.
3728 * Warning:
3729 *
3730 * The data transfer buffers associated with the buffer list
3731 * MUST be freed before freeing the buffer list itself because
3732 * the buffer list contains the information necessary to free
3733 * the individual buffers!
3734 */
3735 static void mgsl_free_buffer_list_memory( struct mgsl_struct *info )
3736 {
3737 if (info->buffer_list && info->bus_type != MGSL_BUS_TYPE_PCI)
3738 dma_free_coherent(NULL, BUFFERLISTSIZE, info->buffer_list, info->buffer_list_dma_addr);
3739
3740 info->buffer_list = NULL;
3741 info->rx_buffer_list = NULL;
3742 info->tx_buffer_list = NULL;
3743
3744 } /* end of mgsl_free_buffer_list_memory() */
3745
3746 /*
3747 * mgsl_alloc_frame_memory()
3748 *
3749 * Allocate the frame DMA buffers used by the specified buffer list.
3750 * Each DMA buffer will be one memory page in size. This is necessary
3751 * because memory can fragment enough that it may be impossible
3752 * contiguous pages.
3753 *
3754 * Arguments:
3755 *
3756 * info pointer to device instance data
3757 * BufferList pointer to list of buffer entries
3758 * Buffercount count of buffer entries in buffer list
3759 *
3760 * Return Value: 0 if success, otherwise -ENOMEM
3761 */
3762 static int mgsl_alloc_frame_memory(struct mgsl_struct *info,DMABUFFERENTRY *BufferList,int Buffercount)
3763 {
3764 int i;
3765 u32 phys_addr;
3766
3767 /* Allocate page sized buffers for the receive buffer list */
3768
3769 for ( i = 0; i < Buffercount; i++ ) {
3770 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
3771 /* PCI adapter uses shared memory buffers. */
3772 BufferList[i].virt_addr = info->memory_base + info->last_mem_alloc;
3773 phys_addr = info->last_mem_alloc;
3774 info->last_mem_alloc += DMABUFFERSIZE;
3775 } else {
3776 /* ISA adapter uses system memory. */
3777 BufferList[i].virt_addr = dma_alloc_coherent(NULL, DMABUFFERSIZE, &BufferList[i].dma_addr, GFP_KERNEL);
3778 if (BufferList[i].virt_addr == NULL)
3779 return -ENOMEM;
3780 phys_addr = (u32)(BufferList[i].dma_addr);
3781 }
3782 BufferList[i].phys_addr = phys_addr;
3783 }
3784
3785 return 0;
3786
3787 } /* end of mgsl_alloc_frame_memory() */
3788
3789 /*
3790 * mgsl_free_frame_memory()
3791 *
3792 * Free the buffers associated with
3793 * each buffer entry of a buffer list.
3794 *
3795 * Arguments:
3796 *
3797 * info pointer to device instance data
3798 * BufferList pointer to list of buffer entries
3799 * Buffercount count of buffer entries in buffer list
3800 *
3801 * Return Value: None
3802 */
3803 static void mgsl_free_frame_memory(struct mgsl_struct *info, DMABUFFERENTRY *BufferList, int Buffercount)
3804 {
3805 int i;
3806
3807 if ( BufferList ) {
3808 for ( i = 0 ; i < Buffercount ; i++ ) {
3809 if ( BufferList[i].virt_addr ) {
3810 if ( info->bus_type != MGSL_BUS_TYPE_PCI )
3811 dma_free_coherent(NULL, DMABUFFERSIZE, BufferList[i].virt_addr, BufferList[i].dma_addr);
3812 BufferList[i].virt_addr = NULL;
3813 }
3814 }
3815 }
3816
3817 } /* end of mgsl_free_frame_memory() */
3818
3819 /* mgsl_free_dma_buffers()
3820 *
3821 * Free DMA buffers
3822 *
3823 * Arguments: info pointer to device instance data
3824 * Return Value: None
3825 */
3826 static void mgsl_free_dma_buffers( struct mgsl_struct *info )
3827 {
3828 mgsl_free_frame_memory( info, info->rx_buffer_list, info->rx_buffer_count );
3829 mgsl_free_frame_memory( info, info->tx_buffer_list, info->tx_buffer_count );
3830 mgsl_free_buffer_list_memory( info );
3831
3832 } /* end of mgsl_free_dma_buffers() */
3833
3834
3835 /*
3836 * mgsl_alloc_intermediate_rxbuffer_memory()
3837 *
3838 * Allocate a buffer large enough to hold max_frame_size. This buffer
3839 * is used to pass an assembled frame to the line discipline.
3840 *
3841 * Arguments:
3842 *
3843 * info pointer to device instance data
3844 *
3845 * Return Value: 0 if success, otherwise -ENOMEM
3846 */
3847 static int mgsl_alloc_intermediate_rxbuffer_memory(struct mgsl_struct *info)
3848 {
3849 info->intermediate_rxbuffer = kmalloc(info->max_frame_size, GFP_KERNEL | GFP_DMA);
3850 if ( info->intermediate_rxbuffer == NULL )
3851 return -ENOMEM;
3852 /* unused flag buffer to satisfy receive_buf calling interface */
3853 info->flag_buf = kzalloc(info->max_frame_size, GFP_KERNEL);
3854 if (!info->flag_buf) {
3855 kfree(info->intermediate_rxbuffer);
3856 info->intermediate_rxbuffer = NULL;
3857 return -ENOMEM;
3858 }
3859 return 0;
3860
3861 } /* end of mgsl_alloc_intermediate_rxbuffer_memory() */
3862
3863 /*
3864 * mgsl_free_intermediate_rxbuffer_memory()
3865 *
3866 *
3867 * Arguments:
3868 *
3869 * info pointer to device instance data
3870 *
3871 * Return Value: None
3872 */
3873 static void mgsl_free_intermediate_rxbuffer_memory(struct mgsl_struct *info)
3874 {
3875 kfree(info->intermediate_rxbuffer);
3876 info->intermediate_rxbuffer = NULL;
3877 kfree(info->flag_buf);
3878 info->flag_buf = NULL;
3879
3880 } /* end of mgsl_free_intermediate_rxbuffer_memory() */
3881
3882 /*
3883 * mgsl_alloc_intermediate_txbuffer_memory()
3884 *
3885 * Allocate intermdiate transmit buffer(s) large enough to hold max_frame_size.
3886 * This buffer is used to load transmit frames into the adapter's dma transfer
3887 * buffers when there is sufficient space.
3888 *
3889 * Arguments:
3890 *
3891 * info pointer to device instance data
3892 *
3893 * Return Value: 0 if success, otherwise -ENOMEM
3894 */
3895 static int mgsl_alloc_intermediate_txbuffer_memory(struct mgsl_struct *info)
3896 {
3897 int i;
3898
3899 if ( debug_level >= DEBUG_LEVEL_INFO )
3900 printk("%s %s(%d) allocating %d tx holding buffers\n",
3901 info->device_name, __FILE__,__LINE__,info->num_tx_holding_buffers);
3902
3903 memset(info->tx_holding_buffers,0,sizeof(info->tx_holding_buffers));
3904
3905 for ( i=0; i<info->num_tx_holding_buffers; ++i) {
3906 info->tx_holding_buffers[i].buffer =
3907 kmalloc(info->max_frame_size, GFP_KERNEL);
3908 if (info->tx_holding_buffers[i].buffer == NULL) {
3909 for (--i; i >= 0; i--) {
3910 kfree(info->tx_holding_buffers[i].buffer);
3911 info->tx_holding_buffers[i].buffer = NULL;
3912 }
3913 return -ENOMEM;
3914 }
3915 }
3916
3917 return 0;
3918
3919 } /* end of mgsl_alloc_intermediate_txbuffer_memory() */
3920
3921 /*
3922 * mgsl_free_intermediate_txbuffer_memory()
3923 *
3924 *
3925 * Arguments:
3926 *
3927 * info pointer to device instance data
3928 *
3929 * Return Value: None
3930 */
3931 static void mgsl_free_intermediate_txbuffer_memory(struct mgsl_struct *info)
3932 {
3933 int i;
3934
3935 for ( i=0; i<info->num_tx_holding_buffers; ++i ) {
3936 kfree(info->tx_holding_buffers[i].buffer);
3937 info->tx_holding_buffers[i].buffer = NULL;
3938 }
3939
3940 info->get_tx_holding_index = 0;
3941 info->put_tx_holding_index = 0;
3942 info->tx_holding_count = 0;
3943
3944 } /* end of mgsl_free_intermediate_txbuffer_memory() */
3945
3946
3947 /*
3948 * load_next_tx_holding_buffer()
3949 *
3950 * attempts to load the next buffered tx request into the
3951 * tx dma buffers
3952 *
3953 * Arguments:
3954 *
3955 * info pointer to device instance data
3956 *
3957 * Return Value: true if next buffered tx request loaded
3958 * into adapter's tx dma buffer,
3959 * false otherwise
3960 */
3961 static bool load_next_tx_holding_buffer(struct mgsl_struct *info)
3962 {
3963 bool ret = false;
3964
3965 if ( info->tx_holding_count ) {
3966 /* determine if we have enough tx dma buffers
3967 * to accommodate the next tx frame
3968 */
3969 struct tx_holding_buffer *ptx =
3970 &info->tx_holding_buffers[info->get_tx_holding_index];
3971 int num_free = num_free_tx_dma_buffers(info);
3972 int num_needed = ptx->buffer_size / DMABUFFERSIZE;
3973 if ( ptx->buffer_size % DMABUFFERSIZE )
3974 ++num_needed;
3975
3976 if (num_needed <= num_free) {
3977 info->xmit_cnt = ptx->buffer_size;
3978 mgsl_load_tx_dma_buffer(info,ptx->buffer,ptx->buffer_size);
3979
3980 --info->tx_holding_count;
3981 if ( ++info->get_tx_holding_index >= info->num_tx_holding_buffers)
3982 info->get_tx_holding_index=0;
3983
3984 /* restart transmit timer */
3985 mod_timer(&info->tx_timer, jiffies + msecs_to_jiffies(5000));
3986
3987 ret = true;
3988 }
3989 }
3990
3991 return ret;
3992 }
3993
3994 /*
3995 * save_tx_buffer_request()
3996 *
3997 * attempt to store transmit frame request for later transmission
3998 *
3999 * Arguments:
4000 *
4001 * info pointer to device instance data
4002 * Buffer pointer to buffer containing frame to load
4003 * BufferSize size in bytes of frame in Buffer
4004 *
4005 * Return Value: 1 if able to store, 0 otherwise
4006 */
4007 static int save_tx_buffer_request(struct mgsl_struct *info,const char *Buffer, unsigned int BufferSize)
4008 {
4009 struct tx_holding_buffer *ptx;
4010
4011 if ( info->tx_holding_count >= info->num_tx_holding_buffers ) {
4012 return 0; /* all buffers in use */
4013 }
4014
4015 ptx = &info->tx_holding_buffers[info->put_tx_holding_index];
4016 ptx->buffer_size = BufferSize;
4017 memcpy( ptx->buffer, Buffer, BufferSize);
4018
4019 ++info->tx_holding_count;
4020 if ( ++info->put_tx_holding_index >= info->num_tx_holding_buffers)
4021 info->put_tx_holding_index=0;
4022
4023 return 1;
4024 }
4025
4026 static int mgsl_claim_resources(struct mgsl_struct *info)
4027 {
4028 if (request_region(info->io_base,info->io_addr_size,"synclink") == NULL) {
4029 printk( "%s(%d):I/O address conflict on device %s Addr=%08X\n",
4030 __FILE__,__LINE__,info->device_name, info->io_base);
4031 return -ENODEV;
4032 }
4033 info->io_addr_requested = true;
4034
4035 if ( request_irq(info->irq_level,mgsl_interrupt,info->irq_flags,
4036 info->device_name, info ) < 0 ) {
4037 printk( "%s(%d):Can't request interrupt on device %s IRQ=%d\n",
4038 __FILE__,__LINE__,info->device_name, info->irq_level );
4039 goto errout;
4040 }
4041 info->irq_requested = true;
4042
4043 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
4044 if (request_mem_region(info->phys_memory_base,0x40000,"synclink") == NULL) {
4045 printk( "%s(%d):mem addr conflict device %s Addr=%08X\n",
4046 __FILE__,__LINE__,info->device_name, info->phys_memory_base);
4047 goto errout;
4048 }
4049 info->shared_mem_requested = true;
4050 if (request_mem_region(info->phys_lcr_base + info->lcr_offset,128,"synclink") == NULL) {
4051 printk( "%s(%d):lcr mem addr conflict device %s Addr=%08X\n",
4052 __FILE__,__LINE__,info->device_name, info->phys_lcr_base + info->lcr_offset);
4053 goto errout;
4054 }
4055 info->lcr_mem_requested = true;
4056
4057 info->memory_base = ioremap(info->phys_memory_base,
4058 0x40000);
4059 if (!info->memory_base) {
4060 printk( "%s(%d):Can't map shared memory on device %s MemAddr=%08X\n",
4061 __FILE__,__LINE__,info->device_name, info->phys_memory_base );
4062 goto errout;
4063 }
4064
4065 if ( !mgsl_memory_test(info) ) {
4066 printk( "%s(%d):Failed shared memory test %s MemAddr=%08X\n",
4067 __FILE__,__LINE__,info->device_name, info->phys_memory_base );
4068 goto errout;
4069 }
4070
4071 info->lcr_base = ioremap(info->phys_lcr_base,
4072 PAGE_SIZE);
4073 if (!info->lcr_base) {
4074 printk( "%s(%d):Can't map LCR memory on device %s MemAddr=%08X\n",
4075 __FILE__,__LINE__,info->device_name, info->phys_lcr_base );
4076 goto errout;
4077 }
4078 info->lcr_base += info->lcr_offset;
4079
4080 } else {
4081 /* claim DMA channel */
4082
4083 if (request_dma(info->dma_level,info->device_name) < 0){
4084 printk( "%s(%d):Can't request DMA channel on device %s DMA=%d\n",
4085 __FILE__,__LINE__,info->device_name, info->dma_level );
4086 goto errout;
4087 }
4088 info->dma_requested = true;
4089
4090 /* ISA adapter uses bus master DMA */
4091 set_dma_mode(info->dma_level,DMA_MODE_CASCADE);
4092 enable_dma(info->dma_level);
4093 }
4094
4095 if ( mgsl_allocate_dma_buffers(info) < 0 ) {
4096 printk( "%s(%d):Can't allocate DMA buffers on device %s DMA=%d\n",
4097 __FILE__,__LINE__,info->device_name, info->dma_level );
4098 goto errout;
4099 }
4100
4101 return 0;
4102 errout:
4103 mgsl_release_resources(info);
4104 return -ENODEV;
4105
4106 } /* end of mgsl_claim_resources() */
4107
4108 static void mgsl_release_resources(struct mgsl_struct *info)
4109 {
4110 if ( debug_level >= DEBUG_LEVEL_INFO )
4111 printk( "%s(%d):mgsl_release_resources(%s) entry\n",
4112 __FILE__,__LINE__,info->device_name );
4113
4114 if ( info->irq_requested ) {
4115 free_irq(info->irq_level, info);
4116 info->irq_requested = false;
4117 }
4118 if ( info->dma_requested ) {
4119 disable_dma(info->dma_level);
4120 free_dma(info->dma_level);
4121 info->dma_requested = false;
4122 }
4123 mgsl_free_dma_buffers(info);
4124 mgsl_free_intermediate_rxbuffer_memory(info);
4125 mgsl_free_intermediate_txbuffer_memory(info);
4126
4127 if ( info->io_addr_requested ) {
4128 release_region(info->io_base,info->io_addr_size);
4129 info->io_addr_requested = false;
4130 }
4131 if ( info->shared_mem_requested ) {
4132 release_mem_region(info->phys_memory_base,0x40000);
4133 info->shared_mem_requested = false;
4134 }
4135 if ( info->lcr_mem_requested ) {
4136 release_mem_region(info->phys_lcr_base + info->lcr_offset,128);
4137 info->lcr_mem_requested = false;
4138 }
4139 if (info->memory_base){
4140 iounmap(info->memory_base);
4141 info->memory_base = NULL;
4142 }
4143 if (info->lcr_base){
4144 iounmap(info->lcr_base - info->lcr_offset);
4145 info->lcr_base = NULL;
4146 }
4147
4148 if ( debug_level >= DEBUG_LEVEL_INFO )
4149 printk( "%s(%d):mgsl_release_resources(%s) exit\n",
4150 __FILE__,__LINE__,info->device_name );
4151
4152 } /* end of mgsl_release_resources() */
4153
4154 /* mgsl_add_device()
4155 *
4156 * Add the specified device instance data structure to the
4157 * global linked list of devices and increment the device count.
4158 *
4159 * Arguments: info pointer to device instance data
4160 * Return Value: None
4161 */
4162 static void mgsl_add_device( struct mgsl_struct *info )
4163 {
4164 info->next_device = NULL;
4165 info->line = mgsl_device_count;
4166 sprintf(info->device_name,"ttySL%d",info->line);
4167
4168 if (info->line < MAX_TOTAL_DEVICES) {
4169 if (maxframe[info->line])
4170 info->max_frame_size = maxframe[info->line];
4171
4172 if (txdmabufs[info->line]) {
4173 info->num_tx_dma_buffers = txdmabufs[info->line];
4174 if (info->num_tx_dma_buffers < 1)
4175 info->num_tx_dma_buffers = 1;
4176 }
4177
4178 if (txholdbufs[info->line]) {
4179 info->num_tx_holding_buffers = txholdbufs[info->line];
4180 if (info->num_tx_holding_buffers < 1)
4181 info->num_tx_holding_buffers = 1;
4182 else if (info->num_tx_holding_buffers > MAX_TX_HOLDING_BUFFERS)
4183 info->num_tx_holding_buffers = MAX_TX_HOLDING_BUFFERS;
4184 }
4185 }
4186
4187 mgsl_device_count++;
4188
4189 if ( !mgsl_device_list )
4190 mgsl_device_list = info;
4191 else {
4192 struct mgsl_struct *current_dev = mgsl_device_list;
4193 while( current_dev->next_device )
4194 current_dev = current_dev->next_device;
4195 current_dev->next_device = info;
4196 }
4197
4198 if ( info->max_frame_size < 4096 )
4199 info->max_frame_size = 4096;
4200 else if ( info->max_frame_size > 65535 )
4201 info->max_frame_size = 65535;
4202
4203 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
4204 printk( "SyncLink PCI v%d %s: IO=%04X IRQ=%d Mem=%08X,%08X MaxFrameSize=%u\n",
4205 info->hw_version + 1, info->device_name, info->io_base, info->irq_level,
4206 info->phys_memory_base, info->phys_lcr_base,
4207 info->max_frame_size );
4208 } else {
4209 printk( "SyncLink ISA %s: IO=%04X IRQ=%d DMA=%d MaxFrameSize=%u\n",
4210 info->device_name, info->io_base, info->irq_level, info->dma_level,
4211 info->max_frame_size );
4212 }
4213
4214 #if SYNCLINK_GENERIC_HDLC
4215 hdlcdev_init(info);
4216 #endif
4217
4218 } /* end of mgsl_add_device() */
4219
4220 static const struct tty_port_operations mgsl_port_ops = {
4221 .carrier_raised = carrier_raised,
4222 .dtr_rts = dtr_rts,
4223 };
4224
4225
4226 /* mgsl_allocate_device()
4227 *
4228 * Allocate and initialize a device instance structure
4229 *
4230 * Arguments: none
4231 * Return Value: pointer to mgsl_struct if success, otherwise NULL
4232 */
4233 static struct mgsl_struct* mgsl_allocate_device(void)
4234 {
4235 struct mgsl_struct *info;
4236
4237 info = kzalloc(sizeof(struct mgsl_struct),
4238 GFP_KERNEL);
4239
4240 if (!info) {
4241 printk("Error can't allocate device instance data\n");
4242 } else {
4243 tty_port_init(&info->port);
4244 info->port.ops = &mgsl_port_ops;
4245 info->magic = MGSL_MAGIC;
4246 INIT_WORK(&info->task, mgsl_bh_handler);
4247 info->max_frame_size = 4096;
4248 info->port.close_delay = 5*HZ/10;
4249 info->port.closing_wait = 30*HZ;
4250 init_waitqueue_head(&info->status_event_wait_q);
4251 init_waitqueue_head(&info->event_wait_q);
4252 spin_lock_init(&info->irq_spinlock);
4253 spin_lock_init(&info->netlock);
4254 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
4255 info->idle_mode = HDLC_TXIDLE_FLAGS;
4256 info->num_tx_dma_buffers = 1;
4257 info->num_tx_holding_buffers = 0;
4258 }
4259
4260 return info;
4261
4262 } /* end of mgsl_allocate_device()*/
4263
4264 static const struct tty_operations mgsl_ops = {
4265 .install = mgsl_install,
4266 .open = mgsl_open,
4267 .close = mgsl_close,
4268 .write = mgsl_write,
4269 .put_char = mgsl_put_char,
4270 .flush_chars = mgsl_flush_chars,
4271 .write_room = mgsl_write_room,
4272 .chars_in_buffer = mgsl_chars_in_buffer,
4273 .flush_buffer = mgsl_flush_buffer,
4274 .ioctl = mgsl_ioctl,
4275 .throttle = mgsl_throttle,
4276 .unthrottle = mgsl_unthrottle,
4277 .send_xchar = mgsl_send_xchar,
4278 .break_ctl = mgsl_break,
4279 .wait_until_sent = mgsl_wait_until_sent,
4280 .set_termios = mgsl_set_termios,
4281 .stop = mgsl_stop,
4282 .start = mgsl_start,
4283 .hangup = mgsl_hangup,
4284 .tiocmget = tiocmget,
4285 .tiocmset = tiocmset,
4286 .get_icount = msgl_get_icount,
4287 .proc_show = mgsl_proc_show,
4288 };
4289
4290 /*
4291 * perform tty device initialization
4292 */
4293 static int mgsl_init_tty(void)
4294 {
4295 int rc;
4296
4297 serial_driver = alloc_tty_driver(128);
4298 if (!serial_driver)
4299 return -ENOMEM;
4300
4301 serial_driver->driver_name = "synclink";
4302 serial_driver->name = "ttySL";
4303 serial_driver->major = ttymajor;
4304 serial_driver->minor_start = 64;
4305 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
4306 serial_driver->subtype = SERIAL_TYPE_NORMAL;
4307 serial_driver->init_termios = tty_std_termios;
4308 serial_driver->init_termios.c_cflag =
4309 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
4310 serial_driver->init_termios.c_ispeed = 9600;
4311 serial_driver->init_termios.c_ospeed = 9600;
4312 serial_driver->flags = TTY_DRIVER_REAL_RAW;
4313 tty_set_operations(serial_driver, &mgsl_ops);
4314 if ((rc = tty_register_driver(serial_driver)) < 0) {
4315 printk("%s(%d):Couldn't register serial driver\n",
4316 __FILE__,__LINE__);
4317 put_tty_driver(serial_driver);
4318 serial_driver = NULL;
4319 return rc;
4320 }
4321
4322 printk("%s %s, tty major#%d\n",
4323 driver_name, driver_version,
4324 serial_driver->major);
4325 return 0;
4326 }
4327
4328 static void synclink_cleanup(void)
4329 {
4330 int rc;
4331 struct mgsl_struct *info;
4332 struct mgsl_struct *tmp;
4333
4334 printk("Unloading %s: %s\n", driver_name, driver_version);
4335
4336 if (serial_driver) {
4337 rc = tty_unregister_driver(serial_driver);
4338 if (rc)
4339 printk("%s(%d) failed to unregister tty driver err=%d\n",
4340 __FILE__,__LINE__,rc);
4341 put_tty_driver(serial_driver);
4342 }
4343
4344 info = mgsl_device_list;
4345 while(info) {
4346 #if SYNCLINK_GENERIC_HDLC
4347 hdlcdev_exit(info);
4348 #endif
4349 mgsl_release_resources(info);
4350 tmp = info;
4351 info = info->next_device;
4352 tty_port_destroy(&tmp->port);
4353 kfree(tmp);
4354 }
4355
4356 if (pci_registered)
4357 pci_unregister_driver(&synclink_pci_driver);
4358 }
4359
4360 static int __init synclink_init(void)
4361 {
4362 int rc;
4363
4364 if (break_on_load) {
4365 mgsl_get_text_ptr();
4366 BREAKPOINT();
4367 }
4368
4369 printk("%s %s\n", driver_name, driver_version);
4370
4371 if ((rc = pci_register_driver(&synclink_pci_driver)) < 0)
4372 printk("%s:failed to register PCI driver, error=%d\n",__FILE__,rc);
4373 else
4374 pci_registered = true;
4375
4376 if ((rc = mgsl_init_tty()) < 0)
4377 goto error;
4378
4379 return 0;
4380
4381 error:
4382 synclink_cleanup();
4383 return rc;
4384 }
4385
4386 static void __exit synclink_exit(void)
4387 {
4388 synclink_cleanup();
4389 }
4390
4391 module_init(synclink_init);
4392 module_exit(synclink_exit);
4393
4394 /*
4395 * usc_RTCmd()
4396 *
4397 * Issue a USC Receive/Transmit command to the
4398 * Channel Command/Address Register (CCAR).
4399 *
4400 * Notes:
4401 *
4402 * The command is encoded in the most significant 5 bits <15..11>
4403 * of the CCAR value. Bits <10..7> of the CCAR must be preserved
4404 * and Bits <6..0> must be written as zeros.
4405 *
4406 * Arguments:
4407 *
4408 * info pointer to device information structure
4409 * Cmd command mask (use symbolic macros)
4410 *
4411 * Return Value:
4412 *
4413 * None
4414 */
4415 static void usc_RTCmd( struct mgsl_struct *info, u16 Cmd )
4416 {
4417 /* output command to CCAR in bits <15..11> */
4418 /* preserve bits <10..7>, bits <6..0> must be zero */
4419
4420 outw( Cmd + info->loopback_bits, info->io_base + CCAR );
4421
4422 /* Read to flush write to CCAR */
4423 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4424 inw( info->io_base + CCAR );
4425
4426 } /* end of usc_RTCmd() */
4427
4428 /*
4429 * usc_DmaCmd()
4430 *
4431 * Issue a DMA command to the DMA Command/Address Register (DCAR).
4432 *
4433 * Arguments:
4434 *
4435 * info pointer to device information structure
4436 * Cmd DMA command mask (usc_DmaCmd_XX Macros)
4437 *
4438 * Return Value:
4439 *
4440 * None
4441 */
4442 static void usc_DmaCmd( struct mgsl_struct *info, u16 Cmd )
4443 {
4444 /* write command mask to DCAR */
4445 outw( Cmd + info->mbre_bit, info->io_base );
4446
4447 /* Read to flush write to DCAR */
4448 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4449 inw( info->io_base );
4450
4451 } /* end of usc_DmaCmd() */
4452
4453 /*
4454 * usc_OutDmaReg()
4455 *
4456 * Write a 16-bit value to a USC DMA register
4457 *
4458 * Arguments:
4459 *
4460 * info pointer to device info structure
4461 * RegAddr register address (number) for write
4462 * RegValue 16-bit value to write to register
4463 *
4464 * Return Value:
4465 *
4466 * None
4467 *
4468 */
4469 static void usc_OutDmaReg( struct mgsl_struct *info, u16 RegAddr, u16 RegValue )
4470 {
4471 /* Note: The DCAR is located at the adapter base address */
4472 /* Note: must preserve state of BIT8 in DCAR */
4473
4474 outw( RegAddr + info->mbre_bit, info->io_base );
4475 outw( RegValue, info->io_base );
4476
4477 /* Read to flush write to DCAR */
4478 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4479 inw( info->io_base );
4480
4481 } /* end of usc_OutDmaReg() */
4482
4483 /*
4484 * usc_InDmaReg()
4485 *
4486 * Read a 16-bit value from a DMA register
4487 *
4488 * Arguments:
4489 *
4490 * info pointer to device info structure
4491 * RegAddr register address (number) to read from
4492 *
4493 * Return Value:
4494 *
4495 * The 16-bit value read from register
4496 *
4497 */
4498 static u16 usc_InDmaReg( struct mgsl_struct *info, u16 RegAddr )
4499 {
4500 /* Note: The DCAR is located at the adapter base address */
4501 /* Note: must preserve state of BIT8 in DCAR */
4502
4503 outw( RegAddr + info->mbre_bit, info->io_base );
4504 return inw( info->io_base );
4505
4506 } /* end of usc_InDmaReg() */
4507
4508 /*
4509 *
4510 * usc_OutReg()
4511 *
4512 * Write a 16-bit value to a USC serial channel register
4513 *
4514 * Arguments:
4515 *
4516 * info pointer to device info structure
4517 * RegAddr register address (number) to write to
4518 * RegValue 16-bit value to write to register
4519 *
4520 * Return Value:
4521 *
4522 * None
4523 *
4524 */
4525 static void usc_OutReg( struct mgsl_struct *info, u16 RegAddr, u16 RegValue )
4526 {
4527 outw( RegAddr + info->loopback_bits, info->io_base + CCAR );
4528 outw( RegValue, info->io_base + CCAR );
4529
4530 /* Read to flush write to CCAR */
4531 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4532 inw( info->io_base + CCAR );
4533
4534 } /* end of usc_OutReg() */
4535
4536 /*
4537 * usc_InReg()
4538 *
4539 * Reads a 16-bit value from a USC serial channel register
4540 *
4541 * Arguments:
4542 *
4543 * info pointer to device extension
4544 * RegAddr register address (number) to read from
4545 *
4546 * Return Value:
4547 *
4548 * 16-bit value read from register
4549 */
4550 static u16 usc_InReg( struct mgsl_struct *info, u16 RegAddr )
4551 {
4552 outw( RegAddr + info->loopback_bits, info->io_base + CCAR );
4553 return inw( info->io_base + CCAR );
4554
4555 } /* end of usc_InReg() */
4556
4557 /* usc_set_sdlc_mode()
4558 *
4559 * Set up the adapter for SDLC DMA communications.
4560 *
4561 * Arguments: info pointer to device instance data
4562 * Return Value: NONE
4563 */
4564 static void usc_set_sdlc_mode( struct mgsl_struct *info )
4565 {
4566 u16 RegValue;
4567 bool PreSL1660;
4568
4569 /*
4570 * determine if the IUSC on the adapter is pre-SL1660. If
4571 * not, take advantage of the UnderWait feature of more
4572 * modern chips. If an underrun occurs and this bit is set,
4573 * the transmitter will idle the programmed idle pattern
4574 * until the driver has time to service the underrun. Otherwise,
4575 * the dma controller may get the cycles previously requested
4576 * and begin transmitting queued tx data.
4577 */
4578 usc_OutReg(info,TMCR,0x1f);
4579 RegValue=usc_InReg(info,TMDR);
4580 PreSL1660 = (RegValue == IUSC_PRE_SL1660);
4581
4582 if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
4583 {
4584 /*
4585 ** Channel Mode Register (CMR)
4586 **
4587 ** <15..14> 10 Tx Sub Modes, Send Flag on Underrun
4588 ** <13> 0 0 = Transmit Disabled (initially)
4589 ** <12> 0 1 = Consecutive Idles share common 0
4590 ** <11..8> 1110 Transmitter Mode = HDLC/SDLC Loop
4591 ** <7..4> 0000 Rx Sub Modes, addr/ctrl field handling
4592 ** <3..0> 0110 Receiver Mode = HDLC/SDLC
4593 **
4594 ** 1000 1110 0000 0110 = 0x8e06
4595 */
4596 RegValue = 0x8e06;
4597
4598 /*--------------------------------------------------
4599 * ignore user options for UnderRun Actions and
4600 * preambles
4601 *--------------------------------------------------*/
4602 }
4603 else
4604 {
4605 /* Channel mode Register (CMR)
4606 *
4607 * <15..14> 00 Tx Sub modes, Underrun Action
4608 * <13> 0 1 = Send Preamble before opening flag
4609 * <12> 0 1 = Consecutive Idles share common 0
4610 * <11..8> 0110 Transmitter mode = HDLC/SDLC
4611 * <7..4> 0000 Rx Sub modes, addr/ctrl field handling
4612 * <3..0> 0110 Receiver mode = HDLC/SDLC
4613 *
4614 * 0000 0110 0000 0110 = 0x0606
4615 */
4616 if (info->params.mode == MGSL_MODE_RAW) {
4617 RegValue = 0x0001; /* Set Receive mode = external sync */
4618
4619 usc_OutReg( info, IOCR, /* Set IOCR DCD is RxSync Detect Input */
4620 (unsigned short)((usc_InReg(info, IOCR) & ~(BIT13|BIT12)) | BIT12));
4621
4622 /*
4623 * TxSubMode:
4624 * CMR <15> 0 Don't send CRC on Tx Underrun
4625 * CMR <14> x undefined
4626 * CMR <13> 0 Send preamble before openning sync
4627 * CMR <12> 0 Send 8-bit syncs, 1=send Syncs per TxLength
4628 *
4629 * TxMode:
4630 * CMR <11-8) 0100 MonoSync
4631 *
4632 * 0x00 0100 xxxx xxxx 04xx
4633 */
4634 RegValue |= 0x0400;
4635 }
4636 else {
4637
4638 RegValue = 0x0606;
4639
4640 if ( info->params.flags & HDLC_FLAG_UNDERRUN_ABORT15 )
4641 RegValue |= BIT14;
4642 else if ( info->params.flags & HDLC_FLAG_UNDERRUN_FLAG )
4643 RegValue |= BIT15;
4644 else if ( info->params.flags & HDLC_FLAG_UNDERRUN_CRC )
4645 RegValue |= BIT15 | BIT14;
4646 }
4647
4648 if ( info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE )
4649 RegValue |= BIT13;
4650 }
4651
4652 if ( info->params.mode == MGSL_MODE_HDLC &&
4653 (info->params.flags & HDLC_FLAG_SHARE_ZERO) )
4654 RegValue |= BIT12;
4655
4656 if ( info->params.addr_filter != 0xff )
4657 {
4658 /* set up receive address filtering */
4659 usc_OutReg( info, RSR, info->params.addr_filter );
4660 RegValue |= BIT4;
4661 }
4662
4663 usc_OutReg( info, CMR, RegValue );
4664 info->cmr_value = RegValue;
4665
4666 /* Receiver mode Register (RMR)
4667 *
4668 * <15..13> 000 encoding
4669 * <12..11> 00 FCS = 16bit CRC CCITT (x15 + x12 + x5 + 1)
4670 * <10> 1 1 = Set CRC to all 1s (use for SDLC/HDLC)
4671 * <9> 0 1 = Include Receive chars in CRC
4672 * <8> 1 1 = Use Abort/PE bit as abort indicator
4673 * <7..6> 00 Even parity
4674 * <5> 0 parity disabled
4675 * <4..2> 000 Receive Char Length = 8 bits
4676 * <1..0> 00 Disable Receiver
4677 *
4678 * 0000 0101 0000 0000 = 0x0500
4679 */
4680
4681 RegValue = 0x0500;
4682
4683 switch ( info->params.encoding ) {
4684 case HDLC_ENCODING_NRZB: RegValue |= BIT13; break;
4685 case HDLC_ENCODING_NRZI_MARK: RegValue |= BIT14; break;
4686 case HDLC_ENCODING_NRZI_SPACE: RegValue |= BIT14 | BIT13; break;
4687 case HDLC_ENCODING_BIPHASE_MARK: RegValue |= BIT15; break;
4688 case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT15 | BIT13; break;
4689 case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT15 | BIT14; break;
4690 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: RegValue |= BIT15 | BIT14 | BIT13; break;
4691 }
4692
4693 if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_16_CCITT )
4694 RegValue |= BIT9;
4695 else if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_32_CCITT )
4696 RegValue |= ( BIT12 | BIT10 | BIT9 );
4697
4698 usc_OutReg( info, RMR, RegValue );
4699
4700 /* Set the Receive count Limit Register (RCLR) to 0xffff. */
4701 /* When an opening flag of an SDLC frame is recognized the */
4702 /* Receive Character count (RCC) is loaded with the value in */
4703 /* RCLR. The RCC is decremented for each received byte. The */
4704 /* value of RCC is stored after the closing flag of the frame */
4705 /* allowing the frame size to be computed. */
4706
4707 usc_OutReg( info, RCLR, RCLRVALUE );
4708
4709 usc_RCmd( info, RCmd_SelectRicrdma_level );
4710
4711 /* Receive Interrupt Control Register (RICR)
4712 *
4713 * <15..8> ? RxFIFO DMA Request Level
4714 * <7> 0 Exited Hunt IA (Interrupt Arm)
4715 * <6> 0 Idle Received IA
4716 * <5> 0 Break/Abort IA
4717 * <4> 0 Rx Bound IA
4718 * <3> 1 Queued status reflects oldest 2 bytes in FIFO
4719 * <2> 0 Abort/PE IA
4720 * <1> 1 Rx Overrun IA
4721 * <0> 0 Select TC0 value for readback
4722 *
4723 * 0000 0000 0000 1000 = 0x000a
4724 */
4725
4726 /* Carry over the Exit Hunt and Idle Received bits */
4727 /* in case they have been armed by usc_ArmEvents. */
4728
4729 RegValue = usc_InReg( info, RICR ) & 0xc0;
4730
4731 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4732 usc_OutReg( info, RICR, (u16)(0x030a | RegValue) );
4733 else
4734 usc_OutReg( info, RICR, (u16)(0x140a | RegValue) );
4735
4736 /* Unlatch all Rx status bits and clear Rx status IRQ Pending */
4737
4738 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
4739 usc_ClearIrqPendingBits( info, RECEIVE_STATUS );
4740
4741 /* Transmit mode Register (TMR)
4742 *
4743 * <15..13> 000 encoding
4744 * <12..11> 00 FCS = 16bit CRC CCITT (x15 + x12 + x5 + 1)
4745 * <10> 1 1 = Start CRC as all 1s (use for SDLC/HDLC)
4746 * <9> 0 1 = Tx CRC Enabled
4747 * <8> 0 1 = Append CRC to end of transmit frame
4748 * <7..6> 00 Transmit parity Even
4749 * <5> 0 Transmit parity Disabled
4750 * <4..2> 000 Tx Char Length = 8 bits
4751 * <1..0> 00 Disable Transmitter
4752 *
4753 * 0000 0100 0000 0000 = 0x0400
4754 */
4755
4756 RegValue = 0x0400;
4757
4758 switch ( info->params.encoding ) {
4759 case HDLC_ENCODING_NRZB: RegValue |= BIT13; break;
4760 case HDLC_ENCODING_NRZI_MARK: RegValue |= BIT14; break;
4761 case HDLC_ENCODING_NRZI_SPACE: RegValue |= BIT14 | BIT13; break;
4762 case HDLC_ENCODING_BIPHASE_MARK: RegValue |= BIT15; break;
4763 case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT15 | BIT13; break;
4764 case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT15 | BIT14; break;
4765 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: RegValue |= BIT15 | BIT14 | BIT13; break;
4766 }
4767
4768 if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_16_CCITT )
4769 RegValue |= BIT9 | BIT8;
4770 else if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_32_CCITT )
4771 RegValue |= ( BIT12 | BIT10 | BIT9 | BIT8);
4772
4773 usc_OutReg( info, TMR, RegValue );
4774
4775 usc_set_txidle( info );
4776
4777
4778 usc_TCmd( info, TCmd_SelectTicrdma_level );
4779
4780 /* Transmit Interrupt Control Register (TICR)
4781 *
4782 * <15..8> ? Transmit FIFO DMA Level
4783 * <7> 0 Present IA (Interrupt Arm)
4784 * <6> 0 Idle Sent IA
4785 * <5> 1 Abort Sent IA
4786 * <4> 1 EOF/EOM Sent IA
4787 * <3> 0 CRC Sent IA
4788 * <2> 1 1 = Wait for SW Trigger to Start Frame
4789 * <1> 1 Tx Underrun IA
4790 * <0> 0 TC0 constant on read back
4791 *
4792 * 0000 0000 0011 0110 = 0x0036
4793 */
4794
4795 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4796 usc_OutReg( info, TICR, 0x0736 );
4797 else
4798 usc_OutReg( info, TICR, 0x1436 );
4799
4800 usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
4801 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
4802
4803 /*
4804 ** Transmit Command/Status Register (TCSR)
4805 **
4806 ** <15..12> 0000 TCmd
4807 ** <11> 0/1 UnderWait
4808 ** <10..08> 000 TxIdle
4809 ** <7> x PreSent
4810 ** <6> x IdleSent
4811 ** <5> x AbortSent
4812 ** <4> x EOF/EOM Sent
4813 ** <3> x CRC Sent
4814 ** <2> x All Sent
4815 ** <1> x TxUnder
4816 ** <0> x TxEmpty
4817 **
4818 ** 0000 0000 0000 0000 = 0x0000
4819 */
4820 info->tcsr_value = 0;
4821
4822 if ( !PreSL1660 )
4823 info->tcsr_value |= TCSR_UNDERWAIT;
4824
4825 usc_OutReg( info, TCSR, info->tcsr_value );
4826
4827 /* Clock mode Control Register (CMCR)
4828 *
4829 * <15..14> 00 counter 1 Source = Disabled
4830 * <13..12> 00 counter 0 Source = Disabled
4831 * <11..10> 11 BRG1 Input is TxC Pin
4832 * <9..8> 11 BRG0 Input is TxC Pin
4833 * <7..6> 01 DPLL Input is BRG1 Output
4834 * <5..3> XXX TxCLK comes from Port 0
4835 * <2..0> XXX RxCLK comes from Port 1
4836 *
4837 * 0000 1111 0111 0111 = 0x0f77
4838 */
4839
4840 RegValue = 0x0f40;
4841
4842 if ( info->params.flags & HDLC_FLAG_RXC_DPLL )
4843 RegValue |= 0x0003; /* RxCLK from DPLL */
4844 else if ( info->params.flags & HDLC_FLAG_RXC_BRG )
4845 RegValue |= 0x0004; /* RxCLK from BRG0 */
4846 else if ( info->params.flags & HDLC_FLAG_RXC_TXCPIN)
4847 RegValue |= 0x0006; /* RxCLK from TXC Input */
4848 else
4849 RegValue |= 0x0007; /* RxCLK from Port1 */
4850
4851 if ( info->params.flags & HDLC_FLAG_TXC_DPLL )
4852 RegValue |= 0x0018; /* TxCLK from DPLL */
4853 else if ( info->params.flags & HDLC_FLAG_TXC_BRG )
4854 RegValue |= 0x0020; /* TxCLK from BRG0 */
4855 else if ( info->params.flags & HDLC_FLAG_TXC_RXCPIN)
4856 RegValue |= 0x0038; /* RxCLK from TXC Input */
4857 else
4858 RegValue |= 0x0030; /* TxCLK from Port0 */
4859
4860 usc_OutReg( info, CMCR, RegValue );
4861
4862
4863 /* Hardware Configuration Register (HCR)
4864 *
4865 * <15..14> 00 CTR0 Divisor:00=32,01=16,10=8,11=4
4866 * <13> 0 CTR1DSel:0=CTR0Div determines CTR0Div
4867 * <12> 0 CVOK:0=report code violation in biphase
4868 * <11..10> 00 DPLL Divisor:00=32,01=16,10=8,11=4
4869 * <9..8> XX DPLL mode:00=disable,01=NRZ,10=Biphase,11=Biphase Level
4870 * <7..6> 00 reserved
4871 * <5> 0 BRG1 mode:0=continuous,1=single cycle
4872 * <4> X BRG1 Enable
4873 * <3..2> 00 reserved
4874 * <1> 0 BRG0 mode:0=continuous,1=single cycle
4875 * <0> 0 BRG0 Enable
4876 */
4877
4878 RegValue = 0x0000;
4879
4880 if ( info->params.flags & (HDLC_FLAG_RXC_DPLL | HDLC_FLAG_TXC_DPLL) ) {
4881 u32 XtalSpeed;
4882 u32 DpllDivisor;
4883 u16 Tc;
4884
4885 /* DPLL is enabled. Use BRG1 to provide continuous reference clock */
4886 /* for DPLL. DPLL mode in HCR is dependent on the encoding used. */
4887
4888 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4889 XtalSpeed = 11059200;
4890 else
4891 XtalSpeed = 14745600;
4892
4893 if ( info->params.flags & HDLC_FLAG_DPLL_DIV16 ) {
4894 DpllDivisor = 16;
4895 RegValue |= BIT10;
4896 }
4897 else if ( info->params.flags & HDLC_FLAG_DPLL_DIV8 ) {
4898 DpllDivisor = 8;
4899 RegValue |= BIT11;
4900 }
4901 else
4902 DpllDivisor = 32;
4903
4904 /* Tc = (Xtal/Speed) - 1 */
4905 /* If twice the remainder of (Xtal/Speed) is greater than Speed */
4906 /* then rounding up gives a more precise time constant. Instead */
4907 /* of rounding up and then subtracting 1 we just don't subtract */
4908 /* the one in this case. */
4909
4910 /*--------------------------------------------------
4911 * ejz: for DPLL mode, application should use the
4912 * same clock speed as the partner system, even
4913 * though clocking is derived from the input RxData.
4914 * In case the user uses a 0 for the clock speed,
4915 * default to 0xffffffff and don't try to divide by
4916 * zero
4917 *--------------------------------------------------*/
4918 if ( info->params.clock_speed )
4919 {
4920 Tc = (u16)((XtalSpeed/DpllDivisor)/info->params.clock_speed);
4921 if ( !((((XtalSpeed/DpllDivisor) % info->params.clock_speed) * 2)
4922 / info->params.clock_speed) )
4923 Tc--;
4924 }
4925 else
4926 Tc = -1;
4927
4928
4929 /* Write 16-bit Time Constant for BRG1 */
4930 usc_OutReg( info, TC1R, Tc );
4931
4932 RegValue |= BIT4; /* enable BRG1 */
4933
4934 switch ( info->params.encoding ) {
4935 case HDLC_ENCODING_NRZ:
4936 case HDLC_ENCODING_NRZB:
4937 case HDLC_ENCODING_NRZI_MARK:
4938 case HDLC_ENCODING_NRZI_SPACE: RegValue |= BIT8; break;
4939 case HDLC_ENCODING_BIPHASE_MARK:
4940 case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT9; break;
4941 case HDLC_ENCODING_BIPHASE_LEVEL:
4942 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: RegValue |= BIT9 | BIT8; break;
4943 }
4944 }
4945
4946 usc_OutReg( info, HCR, RegValue );
4947
4948
4949 /* Channel Control/status Register (CCSR)
4950 *
4951 * <15> X RCC FIFO Overflow status (RO)
4952 * <14> X RCC FIFO Not Empty status (RO)
4953 * <13> 0 1 = Clear RCC FIFO (WO)
4954 * <12> X DPLL Sync (RW)
4955 * <11> X DPLL 2 Missed Clocks status (RO)
4956 * <10> X DPLL 1 Missed Clock status (RO)
4957 * <9..8> 00 DPLL Resync on rising and falling edges (RW)
4958 * <7> X SDLC Loop On status (RO)
4959 * <6> X SDLC Loop Send status (RO)
4960 * <5> 1 Bypass counters for TxClk and RxClk (RW)
4961 * <4..2> 000 Last Char of SDLC frame has 8 bits (RW)
4962 * <1..0> 00 reserved
4963 *
4964 * 0000 0000 0010 0000 = 0x0020
4965 */
4966
4967 usc_OutReg( info, CCSR, 0x1020 );
4968
4969
4970 if ( info->params.flags & HDLC_FLAG_AUTO_CTS ) {
4971 usc_OutReg( info, SICR,
4972 (u16)(usc_InReg(info,SICR) | SICR_CTS_INACTIVE) );
4973 }
4974
4975
4976 /* enable Master Interrupt Enable bit (MIE) */
4977 usc_EnableMasterIrqBit( info );
4978
4979 usc_ClearIrqPendingBits( info, RECEIVE_STATUS | RECEIVE_DATA |
4980 TRANSMIT_STATUS | TRANSMIT_DATA | MISC);
4981
4982 /* arm RCC underflow interrupt */
4983 usc_OutReg(info, SICR, (u16)(usc_InReg(info,SICR) | BIT3));
4984 usc_EnableInterrupts(info, MISC);
4985
4986 info->mbre_bit = 0;
4987 outw( 0, info->io_base ); /* clear Master Bus Enable (DCAR) */
4988 usc_DmaCmd( info, DmaCmd_ResetAllChannels ); /* disable both DMA channels */
4989 info->mbre_bit = BIT8;
4990 outw( BIT8, info->io_base ); /* set Master Bus Enable (DCAR) */
4991
4992 /* DMA Control Register (DCR)
4993 *
4994 * <15..14> 10 Priority mode = Alternating Tx/Rx
4995 * 01 Rx has priority
4996 * 00 Tx has priority
4997 *
4998 * <13> 1 Enable Priority Preempt per DCR<15..14>
4999 * (WARNING DCR<11..10> must be 00 when this is 1)
5000 * 0 Choose activate channel per DCR<11..10>
5001 *
5002 * <12> 0 Little Endian for Array/List
5003 * <11..10> 00 Both Channels can use each bus grant
5004 * <9..6> 0000 reserved
5005 * <5> 0 7 CLK - Minimum Bus Re-request Interval
5006 * <4> 0 1 = drive D/C and S/D pins
5007 * <3> 1 1 = Add one wait state to all DMA cycles.
5008 * <2> 0 1 = Strobe /UAS on every transfer.
5009 * <1..0> 11 Addr incrementing only affects LS24 bits
5010 *
5011 * 0110 0000 0000 1011 = 0x600b
5012 */
5013
5014 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
5015 /* PCI adapter does not need DMA wait state */
5016 usc_OutDmaReg( info, DCR, 0xa00b );
5017 }
5018 else
5019 usc_OutDmaReg( info, DCR, 0x800b );
5020
5021
5022 /* Receive DMA mode Register (RDMR)
5023 *
5024 * <15..14> 11 DMA mode = Linked List Buffer mode
5025 * <13> 1 RSBinA/L = store Rx status Block in Arrary/List entry
5026 * <12> 1 Clear count of List Entry after fetching
5027 * <11..10> 00 Address mode = Increment
5028 * <9> 1 Terminate Buffer on RxBound
5029 * <8> 0 Bus Width = 16bits
5030 * <7..0> ? status Bits (write as 0s)
5031 *
5032 * 1111 0010 0000 0000 = 0xf200
5033 */
5034
5035 usc_OutDmaReg( info, RDMR, 0xf200 );
5036
5037
5038 /* Transmit DMA mode Register (TDMR)
5039 *
5040 * <15..14> 11 DMA mode = Linked List Buffer mode
5041 * <13> 1 TCBinA/L = fetch Tx Control Block from List entry
5042 * <12> 1 Clear count of List Entry after fetching
5043 * <11..10> 00 Address mode = Increment
5044 * <9> 1 Terminate Buffer on end of frame
5045 * <8> 0 Bus Width = 16bits
5046 * <7..0> ? status Bits (Read Only so write as 0)
5047 *
5048 * 1111 0010 0000 0000 = 0xf200
5049 */
5050
5051 usc_OutDmaReg( info, TDMR, 0xf200 );
5052
5053
5054 /* DMA Interrupt Control Register (DICR)
5055 *
5056 * <15> 1 DMA Interrupt Enable
5057 * <14> 0 1 = Disable IEO from USC
5058 * <13> 0 1 = Don't provide vector during IntAck
5059 * <12> 1 1 = Include status in Vector
5060 * <10..2> 0 reserved, Must be 0s
5061 * <1> 0 1 = Rx DMA Interrupt Enabled
5062 * <0> 0 1 = Tx DMA Interrupt Enabled
5063 *
5064 * 1001 0000 0000 0000 = 0x9000
5065 */
5066
5067 usc_OutDmaReg( info, DICR, 0x9000 );
5068
5069 usc_InDmaReg( info, RDMR ); /* clear pending receive DMA IRQ bits */
5070 usc_InDmaReg( info, TDMR ); /* clear pending transmit DMA IRQ bits */
5071 usc_OutDmaReg( info, CDIR, 0x0303 ); /* clear IUS and Pending for Tx and Rx */
5072
5073 /* Channel Control Register (CCR)
5074 *
5075 * <15..14> 10 Use 32-bit Tx Control Blocks (TCBs)
5076 * <13> 0 Trigger Tx on SW Command Disabled
5077 * <12> 0 Flag Preamble Disabled
5078 * <11..10> 00 Preamble Length
5079 * <9..8> 00 Preamble Pattern
5080 * <7..6> 10 Use 32-bit Rx status Blocks (RSBs)
5081 * <5> 0 Trigger Rx on SW Command Disabled
5082 * <4..0> 0 reserved
5083 *
5084 * 1000 0000 1000 0000 = 0x8080
5085 */
5086
5087 RegValue = 0x8080;
5088
5089 switch ( info->params.preamble_length ) {
5090 case HDLC_PREAMBLE_LENGTH_16BITS: RegValue |= BIT10; break;
5091 case HDLC_PREAMBLE_LENGTH_32BITS: RegValue |= BIT11; break;
5092 case HDLC_PREAMBLE_LENGTH_64BITS: RegValue |= BIT11 | BIT10; break;
5093 }
5094
5095 switch ( info->params.preamble ) {
5096 case HDLC_PREAMBLE_PATTERN_FLAGS: RegValue |= BIT8 | BIT12; break;
5097 case HDLC_PREAMBLE_PATTERN_ONES: RegValue |= BIT8; break;
5098 case HDLC_PREAMBLE_PATTERN_10: RegValue |= BIT9; break;
5099 case HDLC_PREAMBLE_PATTERN_01: RegValue |= BIT9 | BIT8; break;
5100 }
5101
5102 usc_OutReg( info, CCR, RegValue );
5103
5104
5105 /*
5106 * Burst/Dwell Control Register
5107 *
5108 * <15..8> 0x20 Maximum number of transfers per bus grant
5109 * <7..0> 0x00 Maximum number of clock cycles per bus grant
5110 */
5111
5112 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
5113 /* don't limit bus occupancy on PCI adapter */
5114 usc_OutDmaReg( info, BDCR, 0x0000 );
5115 }
5116 else
5117 usc_OutDmaReg( info, BDCR, 0x2000 );
5118
5119 usc_stop_transmitter(info);
5120 usc_stop_receiver(info);
5121
5122 } /* end of usc_set_sdlc_mode() */
5123
5124 /* usc_enable_loopback()
5125 *
5126 * Set the 16C32 for internal loopback mode.
5127 * The TxCLK and RxCLK signals are generated from the BRG0 and
5128 * the TxD is looped back to the RxD internally.
5129 *
5130 * Arguments: info pointer to device instance data
5131 * enable 1 = enable loopback, 0 = disable
5132 * Return Value: None
5133 */
5134 static void usc_enable_loopback(struct mgsl_struct *info, int enable)
5135 {
5136 if (enable) {
5137 /* blank external TXD output */
5138 usc_OutReg(info,IOCR,usc_InReg(info,IOCR) | (BIT7 | BIT6));
5139
5140 /* Clock mode Control Register (CMCR)
5141 *
5142 * <15..14> 00 counter 1 Disabled
5143 * <13..12> 00 counter 0 Disabled
5144 * <11..10> 11 BRG1 Input is TxC Pin
5145 * <9..8> 11 BRG0 Input is TxC Pin
5146 * <7..6> 01 DPLL Input is BRG1 Output
5147 * <5..3> 100 TxCLK comes from BRG0
5148 * <2..0> 100 RxCLK comes from BRG0
5149 *
5150 * 0000 1111 0110 0100 = 0x0f64
5151 */
5152
5153 usc_OutReg( info, CMCR, 0x0f64 );
5154
5155 /* Write 16-bit Time Constant for BRG0 */
5156 /* use clock speed if available, otherwise use 8 for diagnostics */
5157 if (info->params.clock_speed) {
5158 if (info->bus_type == MGSL_BUS_TYPE_PCI)
5159 usc_OutReg(info, TC0R, (u16)((11059200/info->params.clock_speed)-1));
5160 else
5161 usc_OutReg(info, TC0R, (u16)((14745600/info->params.clock_speed)-1));
5162 } else
5163 usc_OutReg(info, TC0R, (u16)8);
5164
5165 /* Hardware Configuration Register (HCR) Clear Bit 1, BRG0
5166 mode = Continuous Set Bit 0 to enable BRG0. */
5167 usc_OutReg( info, HCR, (u16)((usc_InReg( info, HCR ) & ~BIT1) | BIT0) );
5168
5169 /* Input/Output Control Reg, <2..0> = 100, Drive RxC pin with BRG0 */
5170 usc_OutReg(info, IOCR, (u16)((usc_InReg(info, IOCR) & 0xfff8) | 0x0004));
5171
5172 /* set Internal Data loopback mode */
5173 info->loopback_bits = 0x300;
5174 outw( 0x0300, info->io_base + CCAR );
5175 } else {
5176 /* enable external TXD output */
5177 usc_OutReg(info,IOCR,usc_InReg(info,IOCR) & ~(BIT7 | BIT6));
5178
5179 /* clear Internal Data loopback mode */
5180 info->loopback_bits = 0;
5181 outw( 0,info->io_base + CCAR );
5182 }
5183
5184 } /* end of usc_enable_loopback() */
5185
5186 /* usc_enable_aux_clock()
5187 *
5188 * Enabled the AUX clock output at the specified frequency.
5189 *
5190 * Arguments:
5191 *
5192 * info pointer to device extension
5193 * data_rate data rate of clock in bits per second
5194 * A data rate of 0 disables the AUX clock.
5195 *
5196 * Return Value: None
5197 */
5198 static void usc_enable_aux_clock( struct mgsl_struct *info, u32 data_rate )
5199 {
5200 u32 XtalSpeed;
5201 u16 Tc;
5202
5203 if ( data_rate ) {
5204 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
5205 XtalSpeed = 11059200;
5206 else
5207 XtalSpeed = 14745600;
5208
5209
5210 /* Tc = (Xtal/Speed) - 1 */
5211 /* If twice the remainder of (Xtal/Speed) is greater than Speed */
5212 /* then rounding up gives a more precise time constant. Instead */
5213 /* of rounding up and then subtracting 1 we just don't subtract */
5214 /* the one in this case. */
5215
5216
5217 Tc = (u16)(XtalSpeed/data_rate);
5218 if ( !(((XtalSpeed % data_rate) * 2) / data_rate) )
5219 Tc--;
5220
5221 /* Write 16-bit Time Constant for BRG0 */
5222 usc_OutReg( info, TC0R, Tc );
5223
5224 /*
5225 * Hardware Configuration Register (HCR)
5226 * Clear Bit 1, BRG0 mode = Continuous
5227 * Set Bit 0 to enable BRG0.
5228 */
5229
5230 usc_OutReg( info, HCR, (u16)((usc_InReg( info, HCR ) & ~BIT1) | BIT0) );
5231
5232 /* Input/Output Control Reg, <2..0> = 100, Drive RxC pin with BRG0 */
5233 usc_OutReg( info, IOCR, (u16)((usc_InReg(info, IOCR) & 0xfff8) | 0x0004) );
5234 } else {
5235 /* data rate == 0 so turn off BRG0 */
5236 usc_OutReg( info, HCR, (u16)(usc_InReg( info, HCR ) & ~BIT0) );
5237 }
5238
5239 } /* end of usc_enable_aux_clock() */
5240
5241 /*
5242 *
5243 * usc_process_rxoverrun_sync()
5244 *
5245 * This function processes a receive overrun by resetting the
5246 * receive DMA buffers and issuing a Purge Rx FIFO command
5247 * to allow the receiver to continue receiving.
5248 *
5249 * Arguments:
5250 *
5251 * info pointer to device extension
5252 *
5253 * Return Value: None
5254 */
5255 static void usc_process_rxoverrun_sync( struct mgsl_struct *info )
5256 {
5257 int start_index;
5258 int end_index;
5259 int frame_start_index;
5260 bool start_of_frame_found = false;
5261 bool end_of_frame_found = false;
5262 bool reprogram_dma = false;
5263
5264 DMABUFFERENTRY *buffer_list = info->rx_buffer_list;
5265 u32 phys_addr;
5266
5267 usc_DmaCmd( info, DmaCmd_PauseRxChannel );
5268 usc_RCmd( info, RCmd_EnterHuntmode );
5269 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5270
5271 /* CurrentRxBuffer points to the 1st buffer of the next */
5272 /* possibly available receive frame. */
5273
5274 frame_start_index = start_index = end_index = info->current_rx_buffer;
5275
5276 /* Search for an unfinished string of buffers. This means */
5277 /* that a receive frame started (at least one buffer with */
5278 /* count set to zero) but there is no terminiting buffer */
5279 /* (status set to non-zero). */
5280
5281 while( !buffer_list[end_index].count )
5282 {
5283 /* Count field has been reset to zero by 16C32. */
5284 /* This buffer is currently in use. */
5285
5286 if ( !start_of_frame_found )
5287 {
5288 start_of_frame_found = true;
5289 frame_start_index = end_index;
5290 end_of_frame_found = false;
5291 }
5292
5293 if ( buffer_list[end_index].status )
5294 {
5295 /* Status field has been set by 16C32. */
5296 /* This is the last buffer of a received frame. */
5297
5298 /* We want to leave the buffers for this frame intact. */
5299 /* Move on to next possible frame. */
5300
5301 start_of_frame_found = false;
5302 end_of_frame_found = true;
5303 }
5304
5305 /* advance to next buffer entry in linked list */
5306 end_index++;
5307 if ( end_index == info->rx_buffer_count )
5308 end_index = 0;
5309
5310 if ( start_index == end_index )
5311 {
5312 /* The entire list has been searched with all Counts == 0 and */
5313 /* all Status == 0. The receive buffers are */
5314 /* completely screwed, reset all receive buffers! */
5315 mgsl_reset_rx_dma_buffers( info );
5316 frame_start_index = 0;
5317 start_of_frame_found = false;
5318 reprogram_dma = true;
5319 break;
5320 }
5321 }
5322
5323 if ( start_of_frame_found && !end_of_frame_found )
5324 {
5325 /* There is an unfinished string of receive DMA buffers */
5326 /* as a result of the receiver overrun. */
5327
5328 /* Reset the buffers for the unfinished frame */
5329 /* and reprogram the receive DMA controller to start */
5330 /* at the 1st buffer of unfinished frame. */
5331
5332 start_index = frame_start_index;
5333
5334 do
5335 {
5336 *((unsigned long *)&(info->rx_buffer_list[start_index++].count)) = DMABUFFERSIZE;
5337
5338 /* Adjust index for wrap around. */
5339 if ( start_index == info->rx_buffer_count )
5340 start_index = 0;
5341
5342 } while( start_index != end_index );
5343
5344 reprogram_dma = true;
5345 }
5346
5347 if ( reprogram_dma )
5348 {
5349 usc_UnlatchRxstatusBits(info,RXSTATUS_ALL);
5350 usc_ClearIrqPendingBits(info, RECEIVE_DATA|RECEIVE_STATUS);
5351 usc_UnlatchRxstatusBits(info, RECEIVE_DATA|RECEIVE_STATUS);
5352
5353 usc_EnableReceiver(info,DISABLE_UNCONDITIONAL);
5354
5355 /* This empties the receive FIFO and loads the RCC with RCLR */
5356 usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
5357
5358 /* program 16C32 with physical address of 1st DMA buffer entry */
5359 phys_addr = info->rx_buffer_list[frame_start_index].phys_entry;
5360 usc_OutDmaReg( info, NRARL, (u16)phys_addr );
5361 usc_OutDmaReg( info, NRARU, (u16)(phys_addr >> 16) );
5362
5363 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
5364 usc_ClearIrqPendingBits( info, RECEIVE_DATA | RECEIVE_STATUS );
5365 usc_EnableInterrupts( info, RECEIVE_STATUS );
5366
5367 /* 1. Arm End of Buffer (EOB) Receive DMA Interrupt (BIT2 of RDIAR) */
5368 /* 2. Enable Receive DMA Interrupts (BIT1 of DICR) */
5369
5370 usc_OutDmaReg( info, RDIAR, BIT3 | BIT2 );
5371 usc_OutDmaReg( info, DICR, (u16)(usc_InDmaReg(info,DICR) | BIT1) );
5372 usc_DmaCmd( info, DmaCmd_InitRxChannel );
5373 if ( info->params.flags & HDLC_FLAG_AUTO_DCD )
5374 usc_EnableReceiver(info,ENABLE_AUTO_DCD);
5375 else
5376 usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
5377 }
5378 else
5379 {
5380 /* This empties the receive FIFO and loads the RCC with RCLR */
5381 usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
5382 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5383 }
5384
5385 } /* end of usc_process_rxoverrun_sync() */
5386
5387 /* usc_stop_receiver()
5388 *
5389 * Disable USC receiver
5390 *
5391 * Arguments: info pointer to device instance data
5392 * Return Value: None
5393 */
5394 static void usc_stop_receiver( struct mgsl_struct *info )
5395 {
5396 if (debug_level >= DEBUG_LEVEL_ISR)
5397 printk("%s(%d):usc_stop_receiver(%s)\n",
5398 __FILE__,__LINE__, info->device_name );
5399
5400 /* Disable receive DMA channel. */
5401 /* This also disables receive DMA channel interrupts */
5402 usc_DmaCmd( info, DmaCmd_ResetRxChannel );
5403
5404 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
5405 usc_ClearIrqPendingBits( info, RECEIVE_DATA | RECEIVE_STATUS );
5406 usc_DisableInterrupts( info, RECEIVE_DATA | RECEIVE_STATUS );
5407
5408 usc_EnableReceiver(info,DISABLE_UNCONDITIONAL);
5409
5410 /* This empties the receive FIFO and loads the RCC with RCLR */
5411 usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
5412 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5413
5414 info->rx_enabled = false;
5415 info->rx_overflow = false;
5416 info->rx_rcc_underrun = false;
5417
5418 } /* end of stop_receiver() */
5419
5420 /* usc_start_receiver()
5421 *
5422 * Enable the USC receiver
5423 *
5424 * Arguments: info pointer to device instance data
5425 * Return Value: None
5426 */
5427 static void usc_start_receiver( struct mgsl_struct *info )
5428 {
5429 u32 phys_addr;
5430
5431 if (debug_level >= DEBUG_LEVEL_ISR)
5432 printk("%s(%d):usc_start_receiver(%s)\n",
5433 __FILE__,__LINE__, info->device_name );
5434
5435 mgsl_reset_rx_dma_buffers( info );
5436 usc_stop_receiver( info );
5437
5438 usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
5439 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5440
5441 if ( info->params.mode == MGSL_MODE_HDLC ||
5442 info->params.mode == MGSL_MODE_RAW ) {
5443 /* DMA mode Transfers */
5444 /* Program the DMA controller. */
5445 /* Enable the DMA controller end of buffer interrupt. */
5446
5447 /* program 16C32 with physical address of 1st DMA buffer entry */
5448 phys_addr = info->rx_buffer_list[0].phys_entry;
5449 usc_OutDmaReg( info, NRARL, (u16)phys_addr );
5450 usc_OutDmaReg( info, NRARU, (u16)(phys_addr >> 16) );
5451
5452 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
5453 usc_ClearIrqPendingBits( info, RECEIVE_DATA | RECEIVE_STATUS );
5454 usc_EnableInterrupts( info, RECEIVE_STATUS );
5455
5456 /* 1. Arm End of Buffer (EOB) Receive DMA Interrupt (BIT2 of RDIAR) */
5457 /* 2. Enable Receive DMA Interrupts (BIT1 of DICR) */
5458
5459 usc_OutDmaReg( info, RDIAR, BIT3 | BIT2 );
5460 usc_OutDmaReg( info, DICR, (u16)(usc_InDmaReg(info,DICR) | BIT1) );
5461 usc_DmaCmd( info, DmaCmd_InitRxChannel );
5462 if ( info->params.flags & HDLC_FLAG_AUTO_DCD )
5463 usc_EnableReceiver(info,ENABLE_AUTO_DCD);
5464 else
5465 usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
5466 } else {
5467 usc_UnlatchRxstatusBits(info, RXSTATUS_ALL);
5468 usc_ClearIrqPendingBits(info, RECEIVE_DATA | RECEIVE_STATUS);
5469 usc_EnableInterrupts(info, RECEIVE_DATA);
5470
5471 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5472 usc_RCmd( info, RCmd_EnterHuntmode );
5473
5474 usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
5475 }
5476
5477 usc_OutReg( info, CCSR, 0x1020 );
5478
5479 info->rx_enabled = true;
5480
5481 } /* end of usc_start_receiver() */
5482
5483 /* usc_start_transmitter()
5484 *
5485 * Enable the USC transmitter and send a transmit frame if
5486 * one is loaded in the DMA buffers.
5487 *
5488 * Arguments: info pointer to device instance data
5489 * Return Value: None
5490 */
5491 static void usc_start_transmitter( struct mgsl_struct *info )
5492 {
5493 u32 phys_addr;
5494 unsigned int FrameSize;
5495
5496 if (debug_level >= DEBUG_LEVEL_ISR)
5497 printk("%s(%d):usc_start_transmitter(%s)\n",
5498 __FILE__,__LINE__, info->device_name );
5499
5500 if ( info->xmit_cnt ) {
5501
5502 /* If auto RTS enabled and RTS is inactive, then assert */
5503 /* RTS and set a flag indicating that the driver should */
5504 /* negate RTS when the transmission completes. */
5505
5506 info->drop_rts_on_tx_done = false;
5507
5508 if ( info->params.flags & HDLC_FLAG_AUTO_RTS ) {
5509 usc_get_serial_signals( info );
5510 if ( !(info->serial_signals & SerialSignal_RTS) ) {
5511 info->serial_signals |= SerialSignal_RTS;
5512 usc_set_serial_signals( info );
5513 info->drop_rts_on_tx_done = true;
5514 }
5515 }
5516
5517
5518 if ( info->params.mode == MGSL_MODE_ASYNC ) {
5519 if ( !info->tx_active ) {
5520 usc_UnlatchTxstatusBits(info, TXSTATUS_ALL);
5521 usc_ClearIrqPendingBits(info, TRANSMIT_STATUS + TRANSMIT_DATA);
5522 usc_EnableInterrupts(info, TRANSMIT_DATA);
5523 usc_load_txfifo(info);
5524 }
5525 } else {
5526 /* Disable transmit DMA controller while programming. */
5527 usc_DmaCmd( info, DmaCmd_ResetTxChannel );
5528
5529 /* Transmit DMA buffer is loaded, so program USC */
5530 /* to send the frame contained in the buffers. */
5531
5532 FrameSize = info->tx_buffer_list[info->start_tx_dma_buffer].rcc;
5533
5534 /* if operating in Raw sync mode, reset the rcc component
5535 * of the tx dma buffer entry, otherwise, the serial controller
5536 * will send a closing sync char after this count.
5537 */
5538 if ( info->params.mode == MGSL_MODE_RAW )
5539 info->tx_buffer_list[info->start_tx_dma_buffer].rcc = 0;
5540
5541 /* Program the Transmit Character Length Register (TCLR) */
5542 /* and clear FIFO (TCC is loaded with TCLR on FIFO clear) */
5543 usc_OutReg( info, TCLR, (u16)FrameSize );
5544
5545 usc_RTCmd( info, RTCmd_PurgeTxFifo );
5546
5547 /* Program the address of the 1st DMA Buffer Entry in linked list */
5548 phys_addr = info->tx_buffer_list[info->start_tx_dma_buffer].phys_entry;
5549 usc_OutDmaReg( info, NTARL, (u16)phys_addr );
5550 usc_OutDmaReg( info, NTARU, (u16)(phys_addr >> 16) );
5551
5552 usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
5553 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
5554 usc_EnableInterrupts( info, TRANSMIT_STATUS );
5555
5556 if ( info->params.mode == MGSL_MODE_RAW &&
5557 info->num_tx_dma_buffers > 1 ) {
5558 /* When running external sync mode, attempt to 'stream' transmit */
5559 /* by filling tx dma buffers as they become available. To do this */
5560 /* we need to enable Tx DMA EOB Status interrupts : */
5561 /* */
5562 /* 1. Arm End of Buffer (EOB) Transmit DMA Interrupt (BIT2 of TDIAR) */
5563 /* 2. Enable Transmit DMA Interrupts (BIT0 of DICR) */
5564
5565 usc_OutDmaReg( info, TDIAR, BIT2|BIT3 );
5566 usc_OutDmaReg( info, DICR, (u16)(usc_InDmaReg(info,DICR) | BIT0) );
5567 }
5568
5569 /* Initialize Transmit DMA Channel */
5570 usc_DmaCmd( info, DmaCmd_InitTxChannel );
5571
5572 usc_TCmd( info, TCmd_SendFrame );
5573
5574 mod_timer(&info->tx_timer, jiffies +
5575 msecs_to_jiffies(5000));
5576 }
5577 info->tx_active = true;
5578 }
5579
5580 if ( !info->tx_enabled ) {
5581 info->tx_enabled = true;
5582 if ( info->params.flags & HDLC_FLAG_AUTO_CTS )
5583 usc_EnableTransmitter(info,ENABLE_AUTO_CTS);
5584 else
5585 usc_EnableTransmitter(info,ENABLE_UNCONDITIONAL);
5586 }
5587
5588 } /* end of usc_start_transmitter() */
5589
5590 /* usc_stop_transmitter()
5591 *
5592 * Stops the transmitter and DMA
5593 *
5594 * Arguments: info pointer to device isntance data
5595 * Return Value: None
5596 */
5597 static void usc_stop_transmitter( struct mgsl_struct *info )
5598 {
5599 if (debug_level >= DEBUG_LEVEL_ISR)
5600 printk("%s(%d):usc_stop_transmitter(%s)\n",
5601 __FILE__,__LINE__, info->device_name );
5602
5603 del_timer(&info->tx_timer);
5604
5605 usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
5606 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS + TRANSMIT_DATA );
5607 usc_DisableInterrupts( info, TRANSMIT_STATUS + TRANSMIT_DATA );
5608
5609 usc_EnableTransmitter(info,DISABLE_UNCONDITIONAL);
5610 usc_DmaCmd( info, DmaCmd_ResetTxChannel );
5611 usc_RTCmd( info, RTCmd_PurgeTxFifo );
5612
5613 info->tx_enabled = false;
5614 info->tx_active = false;
5615
5616 } /* end of usc_stop_transmitter() */
5617
5618 /* usc_load_txfifo()
5619 *
5620 * Fill the transmit FIFO until the FIFO is full or
5621 * there is no more data to load.
5622 *
5623 * Arguments: info pointer to device extension (instance data)
5624 * Return Value: None
5625 */
5626 static void usc_load_txfifo( struct mgsl_struct *info )
5627 {
5628 int Fifocount;
5629 u8 TwoBytes[2];
5630
5631 if ( !info->xmit_cnt && !info->x_char )
5632 return;
5633
5634 /* Select transmit FIFO status readback in TICR */
5635 usc_TCmd( info, TCmd_SelectTicrTxFifostatus );
5636
5637 /* load the Transmit FIFO until FIFOs full or all data sent */
5638
5639 while( (Fifocount = usc_InReg(info, TICR) >> 8) && info->xmit_cnt ) {
5640 /* there is more space in the transmit FIFO and */
5641 /* there is more data in transmit buffer */
5642
5643 if ( (info->xmit_cnt > 1) && (Fifocount > 1) && !info->x_char ) {
5644 /* write a 16-bit word from transmit buffer to 16C32 */
5645
5646 TwoBytes[0] = info->xmit_buf[info->xmit_tail++];
5647 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
5648 TwoBytes[1] = info->xmit_buf[info->xmit_tail++];
5649 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
5650
5651 outw( *((u16 *)TwoBytes), info->io_base + DATAREG);
5652
5653 info->xmit_cnt -= 2;
5654 info->icount.tx += 2;
5655 } else {
5656 /* only 1 byte left to transmit or 1 FIFO slot left */
5657
5658 outw( (inw( info->io_base + CCAR) & 0x0780) | (TDR+LSBONLY),
5659 info->io_base + CCAR );
5660
5661 if (info->x_char) {
5662 /* transmit pending high priority char */
5663 outw( info->x_char,info->io_base + CCAR );
5664 info->x_char = 0;
5665 } else {
5666 outw( info->xmit_buf[info->xmit_tail++],info->io_base + CCAR );
5667 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
5668 info->xmit_cnt--;
5669 }
5670 info->icount.tx++;
5671 }
5672 }
5673
5674 } /* end of usc_load_txfifo() */
5675
5676 /* usc_reset()
5677 *
5678 * Reset the adapter to a known state and prepare it for further use.
5679 *
5680 * Arguments: info pointer to device instance data
5681 * Return Value: None
5682 */
5683 static void usc_reset( struct mgsl_struct *info )
5684 {
5685 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
5686 int i;
5687 u32 readval;
5688
5689 /* Set BIT30 of Misc Control Register */
5690 /* (Local Control Register 0x50) to force reset of USC. */
5691
5692 volatile u32 *MiscCtrl = (u32 *)(info->lcr_base + 0x50);
5693 u32 *LCR0BRDR = (u32 *)(info->lcr_base + 0x28);
5694
5695 info->misc_ctrl_value |= BIT30;
5696 *MiscCtrl = info->misc_ctrl_value;
5697
5698 /*
5699 * Force at least 170ns delay before clearing
5700 * reset bit. Each read from LCR takes at least
5701 * 30ns so 10 times for 300ns to be safe.
5702 */
5703 for(i=0;i<10;i++)
5704 readval = *MiscCtrl;
5705
5706 info->misc_ctrl_value &= ~BIT30;
5707 *MiscCtrl = info->misc_ctrl_value;
5708
5709 *LCR0BRDR = BUS_DESCRIPTOR(
5710 1, // Write Strobe Hold (0-3)
5711 2, // Write Strobe Delay (0-3)
5712 2, // Read Strobe Delay (0-3)
5713 0, // NWDD (Write data-data) (0-3)
5714 4, // NWAD (Write Addr-data) (0-31)
5715 0, // NXDA (Read/Write Data-Addr) (0-3)
5716 0, // NRDD (Read Data-Data) (0-3)
5717 5 // NRAD (Read Addr-Data) (0-31)
5718 );
5719 } else {
5720 /* do HW reset */
5721 outb( 0,info->io_base + 8 );
5722 }
5723
5724 info->mbre_bit = 0;
5725 info->loopback_bits = 0;
5726 info->usc_idle_mode = 0;
5727
5728 /*
5729 * Program the Bus Configuration Register (BCR)
5730 *
5731 * <15> 0 Don't use separate address
5732 * <14..6> 0 reserved
5733 * <5..4> 00 IAckmode = Default, don't care
5734 * <3> 1 Bus Request Totem Pole output
5735 * <2> 1 Use 16 Bit data bus
5736 * <1> 0 IRQ Totem Pole output
5737 * <0> 0 Don't Shift Right Addr
5738 *
5739 * 0000 0000 0000 1100 = 0x000c
5740 *
5741 * By writing to io_base + SDPIN the Wait/Ack pin is
5742 * programmed to work as a Wait pin.
5743 */
5744
5745 outw( 0x000c,info->io_base + SDPIN );
5746
5747
5748 outw( 0,info->io_base );
5749 outw( 0,info->io_base + CCAR );
5750
5751 /* select little endian byte ordering */
5752 usc_RTCmd( info, RTCmd_SelectLittleEndian );
5753
5754
5755 /* Port Control Register (PCR)
5756 *
5757 * <15..14> 11 Port 7 is Output (~DMAEN, Bit 14 : 0 = Enabled)
5758 * <13..12> 11 Port 6 is Output (~INTEN, Bit 12 : 0 = Enabled)
5759 * <11..10> 00 Port 5 is Input (No Connect, Don't Care)
5760 * <9..8> 00 Port 4 is Input (No Connect, Don't Care)
5761 * <7..6> 11 Port 3 is Output (~RTS, Bit 6 : 0 = Enabled )
5762 * <5..4> 11 Port 2 is Output (~DTR, Bit 4 : 0 = Enabled )
5763 * <3..2> 01 Port 1 is Input (Dedicated RxC)
5764 * <1..0> 01 Port 0 is Input (Dedicated TxC)
5765 *
5766 * 1111 0000 1111 0101 = 0xf0f5
5767 */
5768
5769 usc_OutReg( info, PCR, 0xf0f5 );
5770
5771
5772 /*
5773 * Input/Output Control Register
5774 *
5775 * <15..14> 00 CTS is active low input
5776 * <13..12> 00 DCD is active low input
5777 * <11..10> 00 TxREQ pin is input (DSR)
5778 * <9..8> 00 RxREQ pin is input (RI)
5779 * <7..6> 00 TxD is output (Transmit Data)
5780 * <5..3> 000 TxC Pin in Input (14.7456MHz Clock)
5781 * <2..0> 100 RxC is Output (drive with BRG0)
5782 *
5783 * 0000 0000 0000 0100 = 0x0004
5784 */
5785
5786 usc_OutReg( info, IOCR, 0x0004 );
5787
5788 } /* end of usc_reset() */
5789
5790 /* usc_set_async_mode()
5791 *
5792 * Program adapter for asynchronous communications.
5793 *
5794 * Arguments: info pointer to device instance data
5795 * Return Value: None
5796 */
5797 static void usc_set_async_mode( struct mgsl_struct *info )
5798 {
5799 u16 RegValue;
5800
5801 /* disable interrupts while programming USC */
5802 usc_DisableMasterIrqBit( info );
5803
5804 outw( 0, info->io_base ); /* clear Master Bus Enable (DCAR) */
5805 usc_DmaCmd( info, DmaCmd_ResetAllChannels ); /* disable both DMA channels */
5806
5807 usc_loopback_frame( info );
5808
5809 /* Channel mode Register (CMR)
5810 *
5811 * <15..14> 00 Tx Sub modes, 00 = 1 Stop Bit
5812 * <13..12> 00 00 = 16X Clock
5813 * <11..8> 0000 Transmitter mode = Asynchronous
5814 * <7..6> 00 reserved?
5815 * <5..4> 00 Rx Sub modes, 00 = 16X Clock
5816 * <3..0> 0000 Receiver mode = Asynchronous
5817 *
5818 * 0000 0000 0000 0000 = 0x0
5819 */
5820
5821 RegValue = 0;
5822 if ( info->params.stop_bits != 1 )
5823 RegValue |= BIT14;
5824 usc_OutReg( info, CMR, RegValue );
5825
5826
5827 /* Receiver mode Register (RMR)
5828 *
5829 * <15..13> 000 encoding = None
5830 * <12..08> 00000 reserved (Sync Only)
5831 * <7..6> 00 Even parity
5832 * <5> 0 parity disabled
5833 * <4..2> 000 Receive Char Length = 8 bits
5834 * <1..0> 00 Disable Receiver
5835 *
5836 * 0000 0000 0000 0000 = 0x0
5837 */
5838
5839 RegValue = 0;
5840
5841 if ( info->params.data_bits != 8 )
5842 RegValue |= BIT4 | BIT3 | BIT2;
5843
5844 if ( info->params.parity != ASYNC_PARITY_NONE ) {
5845 RegValue |= BIT5;
5846 if ( info->params.parity != ASYNC_PARITY_ODD )
5847 RegValue |= BIT6;
5848 }
5849
5850 usc_OutReg( info, RMR, RegValue );
5851
5852
5853 /* Set IRQ trigger level */
5854
5855 usc_RCmd( info, RCmd_SelectRicrIntLevel );
5856
5857
5858 /* Receive Interrupt Control Register (RICR)
5859 *
5860 * <15..8> ? RxFIFO IRQ Request Level
5861 *
5862 * Note: For async mode the receive FIFO level must be set
5863 * to 0 to avoid the situation where the FIFO contains fewer bytes
5864 * than the trigger level and no more data is expected.
5865 *
5866 * <7> 0 Exited Hunt IA (Interrupt Arm)
5867 * <6> 0 Idle Received IA
5868 * <5> 0 Break/Abort IA
5869 * <4> 0 Rx Bound IA
5870 * <3> 0 Queued status reflects oldest byte in FIFO
5871 * <2> 0 Abort/PE IA
5872 * <1> 0 Rx Overrun IA
5873 * <0> 0 Select TC0 value for readback
5874 *
5875 * 0000 0000 0100 0000 = 0x0000 + (FIFOLEVEL in MSB)
5876 */
5877
5878 usc_OutReg( info, RICR, 0x0000 );
5879
5880 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
5881 usc_ClearIrqPendingBits( info, RECEIVE_STATUS );
5882
5883
5884 /* Transmit mode Register (TMR)
5885 *
5886 * <15..13> 000 encoding = None
5887 * <12..08> 00000 reserved (Sync Only)
5888 * <7..6> 00 Transmit parity Even
5889 * <5> 0 Transmit parity Disabled
5890 * <4..2> 000 Tx Char Length = 8 bits
5891 * <1..0> 00 Disable Transmitter
5892 *
5893 * 0000 0000 0000 0000 = 0x0
5894 */
5895
5896 RegValue = 0;
5897
5898 if ( info->params.data_bits != 8 )
5899 RegValue |= BIT4 | BIT3 | BIT2;
5900
5901 if ( info->params.parity != ASYNC_PARITY_NONE ) {
5902 RegValue |= BIT5;
5903 if ( info->params.parity != ASYNC_PARITY_ODD )
5904 RegValue |= BIT6;
5905 }
5906
5907 usc_OutReg( info, TMR, RegValue );
5908
5909 usc_set_txidle( info );
5910
5911
5912 /* Set IRQ trigger level */
5913
5914 usc_TCmd( info, TCmd_SelectTicrIntLevel );
5915
5916
5917 /* Transmit Interrupt Control Register (TICR)
5918 *
5919 * <15..8> ? Transmit FIFO IRQ Level
5920 * <7> 0 Present IA (Interrupt Arm)
5921 * <6> 1 Idle Sent IA
5922 * <5> 0 Abort Sent IA
5923 * <4> 0 EOF/EOM Sent IA
5924 * <3> 0 CRC Sent IA
5925 * <2> 0 1 = Wait for SW Trigger to Start Frame
5926 * <1> 0 Tx Underrun IA
5927 * <0> 0 TC0 constant on read back
5928 *
5929 * 0000 0000 0100 0000 = 0x0040
5930 */
5931
5932 usc_OutReg( info, TICR, 0x1f40 );
5933
5934 usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
5935 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
5936
5937 usc_enable_async_clock( info, info->params.data_rate );
5938
5939
5940 /* Channel Control/status Register (CCSR)
5941 *
5942 * <15> X RCC FIFO Overflow status (RO)
5943 * <14> X RCC FIFO Not Empty status (RO)
5944 * <13> 0 1 = Clear RCC FIFO (WO)
5945 * <12> X DPLL in Sync status (RO)
5946 * <11> X DPLL 2 Missed Clocks status (RO)
5947 * <10> X DPLL 1 Missed Clock status (RO)
5948 * <9..8> 00 DPLL Resync on rising and falling edges (RW)
5949 * <7> X SDLC Loop On status (RO)
5950 * <6> X SDLC Loop Send status (RO)
5951 * <5> 1 Bypass counters for TxClk and RxClk (RW)
5952 * <4..2> 000 Last Char of SDLC frame has 8 bits (RW)
5953 * <1..0> 00 reserved
5954 *
5955 * 0000 0000 0010 0000 = 0x0020
5956 */
5957
5958 usc_OutReg( info, CCSR, 0x0020 );
5959
5960 usc_DisableInterrupts( info, TRANSMIT_STATUS + TRANSMIT_DATA +
5961 RECEIVE_DATA + RECEIVE_STATUS );
5962
5963 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS + TRANSMIT_DATA +
5964 RECEIVE_DATA + RECEIVE_STATUS );
5965
5966 usc_EnableMasterIrqBit( info );
5967
5968 if (info->params.loopback) {
5969 info->loopback_bits = 0x300;
5970 outw(0x0300, info->io_base + CCAR);
5971 }
5972
5973 } /* end of usc_set_async_mode() */
5974
5975 /* usc_loopback_frame()
5976 *
5977 * Loop back a small (2 byte) dummy SDLC frame.
5978 * Interrupts and DMA are NOT used. The purpose of this is to
5979 * clear any 'stale' status info left over from running in async mode.
5980 *
5981 * The 16C32 shows the strange behaviour of marking the 1st
5982 * received SDLC frame with a CRC error even when there is no
5983 * CRC error. To get around this a small dummy from of 2 bytes
5984 * is looped back when switching from async to sync mode.
5985 *
5986 * Arguments: info pointer to device instance data
5987 * Return Value: None
5988 */
5989 static void usc_loopback_frame( struct mgsl_struct *info )
5990 {
5991 int i;
5992 unsigned long oldmode = info->params.mode;
5993
5994 info->params.mode = MGSL_MODE_HDLC;
5995
5996 usc_DisableMasterIrqBit( info );
5997
5998 usc_set_sdlc_mode( info );
5999 usc_enable_loopback( info, 1 );
6000
6001 /* Write 16-bit Time Constant for BRG0 */
6002 usc_OutReg( info, TC0R, 0 );
6003
6004 /* Channel Control Register (CCR)
6005 *
6006 * <15..14> 00 Don't use 32-bit Tx Control Blocks (TCBs)
6007 * <13> 0 Trigger Tx on SW Command Disabled
6008 * <12> 0 Flag Preamble Disabled
6009 * <11..10> 00 Preamble Length = 8-Bits
6010 * <9..8> 01 Preamble Pattern = flags
6011 * <7..6> 10 Don't use 32-bit Rx status Blocks (RSBs)
6012 * <5> 0 Trigger Rx on SW Command Disabled
6013 * <4..0> 0 reserved
6014 *
6015 * 0000 0001 0000 0000 = 0x0100
6016 */
6017
6018 usc_OutReg( info, CCR, 0x0100 );
6019
6020 /* SETUP RECEIVER */
6021 usc_RTCmd( info, RTCmd_PurgeRxFifo );
6022 usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
6023
6024 /* SETUP TRANSMITTER */
6025 /* Program the Transmit Character Length Register (TCLR) */
6026 /* and clear FIFO (TCC is loaded with TCLR on FIFO clear) */
6027 usc_OutReg( info, TCLR, 2 );
6028 usc_RTCmd( info, RTCmd_PurgeTxFifo );
6029
6030 /* unlatch Tx status bits, and start transmit channel. */
6031 usc_UnlatchTxstatusBits(info,TXSTATUS_ALL);
6032 outw(0,info->io_base + DATAREG);
6033
6034 /* ENABLE TRANSMITTER */
6035 usc_TCmd( info, TCmd_SendFrame );
6036 usc_EnableTransmitter(info,ENABLE_UNCONDITIONAL);
6037
6038 /* WAIT FOR RECEIVE COMPLETE */
6039 for (i=0 ; i<1000 ; i++)
6040 if (usc_InReg( info, RCSR ) & (BIT8 | BIT4 | BIT3 | BIT1))
6041 break;
6042
6043 /* clear Internal Data loopback mode */
6044 usc_enable_loopback(info, 0);
6045
6046 usc_EnableMasterIrqBit(info);
6047
6048 info->params.mode = oldmode;
6049
6050 } /* end of usc_loopback_frame() */
6051
6052 /* usc_set_sync_mode() Programs the USC for SDLC communications.
6053 *
6054 * Arguments: info pointer to adapter info structure
6055 * Return Value: None
6056 */
6057 static void usc_set_sync_mode( struct mgsl_struct *info )
6058 {
6059 usc_loopback_frame( info );
6060 usc_set_sdlc_mode( info );
6061
6062 usc_enable_aux_clock(info, info->params.clock_speed);
6063
6064 if (info->params.loopback)
6065 usc_enable_loopback(info,1);
6066
6067 } /* end of mgsl_set_sync_mode() */
6068
6069 /* usc_set_txidle() Set the HDLC idle mode for the transmitter.
6070 *
6071 * Arguments: info pointer to device instance data
6072 * Return Value: None
6073 */
6074 static void usc_set_txidle( struct mgsl_struct *info )
6075 {
6076 u16 usc_idle_mode = IDLEMODE_FLAGS;
6077
6078 /* Map API idle mode to USC register bits */
6079
6080 switch( info->idle_mode ){
6081 case HDLC_TXIDLE_FLAGS: usc_idle_mode = IDLEMODE_FLAGS; break;
6082 case HDLC_TXIDLE_ALT_ZEROS_ONES: usc_idle_mode = IDLEMODE_ALT_ONE_ZERO; break;
6083 case HDLC_TXIDLE_ZEROS: usc_idle_mode = IDLEMODE_ZERO; break;
6084 case HDLC_TXIDLE_ONES: usc_idle_mode = IDLEMODE_ONE; break;
6085 case HDLC_TXIDLE_ALT_MARK_SPACE: usc_idle_mode = IDLEMODE_ALT_MARK_SPACE; break;
6086 case HDLC_TXIDLE_SPACE: usc_idle_mode = IDLEMODE_SPACE; break;
6087 case HDLC_TXIDLE_MARK: usc_idle_mode = IDLEMODE_MARK; break;
6088 }
6089
6090 info->usc_idle_mode = usc_idle_mode;
6091 //usc_OutReg(info, TCSR, usc_idle_mode);
6092 info->tcsr_value &= ~IDLEMODE_MASK; /* clear idle mode bits */
6093 info->tcsr_value += usc_idle_mode;
6094 usc_OutReg(info, TCSR, info->tcsr_value);
6095
6096 /*
6097 * if SyncLink WAN adapter is running in external sync mode, the
6098 * transmitter has been set to Monosync in order to try to mimic
6099 * a true raw outbound bit stream. Monosync still sends an open/close
6100 * sync char at the start/end of a frame. Try to match those sync
6101 * patterns to the idle mode set here
6102 */
6103 if ( info->params.mode == MGSL_MODE_RAW ) {
6104 unsigned char syncpat = 0;
6105 switch( info->idle_mode ) {
6106 case HDLC_TXIDLE_FLAGS:
6107 syncpat = 0x7e;
6108 break;
6109 case HDLC_TXIDLE_ALT_ZEROS_ONES:
6110 syncpat = 0x55;
6111 break;
6112 case HDLC_TXIDLE_ZEROS:
6113 case HDLC_TXIDLE_SPACE:
6114 syncpat = 0x00;
6115 break;
6116 case HDLC_TXIDLE_ONES:
6117 case HDLC_TXIDLE_MARK:
6118 syncpat = 0xff;
6119 break;
6120 case HDLC_TXIDLE_ALT_MARK_SPACE:
6121 syncpat = 0xaa;
6122 break;
6123 }
6124
6125 usc_SetTransmitSyncChars(info,syncpat,syncpat);
6126 }
6127
6128 } /* end of usc_set_txidle() */
6129
6130 /* usc_get_serial_signals()
6131 *
6132 * Query the adapter for the state of the V24 status (input) signals.
6133 *
6134 * Arguments: info pointer to device instance data
6135 * Return Value: None
6136 */
6137 static void usc_get_serial_signals( struct mgsl_struct *info )
6138 {
6139 u16 status;
6140
6141 /* clear all serial signals except RTS and DTR */
6142 info->serial_signals &= SerialSignal_RTS | SerialSignal_DTR;
6143
6144 /* Read the Misc Interrupt status Register (MISR) to get */
6145 /* the V24 status signals. */
6146
6147 status = usc_InReg( info, MISR );
6148
6149 /* set serial signal bits to reflect MISR */
6150
6151 if ( status & MISCSTATUS_CTS )
6152 info->serial_signals |= SerialSignal_CTS;
6153
6154 if ( status & MISCSTATUS_DCD )
6155 info->serial_signals |= SerialSignal_DCD;
6156
6157 if ( status & MISCSTATUS_RI )
6158 info->serial_signals |= SerialSignal_RI;
6159
6160 if ( status & MISCSTATUS_DSR )
6161 info->serial_signals |= SerialSignal_DSR;
6162
6163 } /* end of usc_get_serial_signals() */
6164
6165 /* usc_set_serial_signals()
6166 *
6167 * Set the state of RTS and DTR based on contents of
6168 * serial_signals member of device extension.
6169 *
6170 * Arguments: info pointer to device instance data
6171 * Return Value: None
6172 */
6173 static void usc_set_serial_signals( struct mgsl_struct *info )
6174 {
6175 u16 Control;
6176 unsigned char V24Out = info->serial_signals;
6177
6178 /* get the current value of the Port Control Register (PCR) */
6179
6180 Control = usc_InReg( info, PCR );
6181
6182 if ( V24Out & SerialSignal_RTS )
6183 Control &= ~(BIT6);
6184 else
6185 Control |= BIT6;
6186
6187 if ( V24Out & SerialSignal_DTR )
6188 Control &= ~(BIT4);
6189 else
6190 Control |= BIT4;
6191
6192 usc_OutReg( info, PCR, Control );
6193
6194 } /* end of usc_set_serial_signals() */
6195
6196 /* usc_enable_async_clock()
6197 *
6198 * Enable the async clock at the specified frequency.
6199 *
6200 * Arguments: info pointer to device instance data
6201 * data_rate data rate of clock in bps
6202 * 0 disables the AUX clock.
6203 * Return Value: None
6204 */
6205 static void usc_enable_async_clock( struct mgsl_struct *info, u32 data_rate )
6206 {
6207 if ( data_rate ) {
6208 /*
6209 * Clock mode Control Register (CMCR)
6210 *
6211 * <15..14> 00 counter 1 Disabled
6212 * <13..12> 00 counter 0 Disabled
6213 * <11..10> 11 BRG1 Input is TxC Pin
6214 * <9..8> 11 BRG0 Input is TxC Pin
6215 * <7..6> 01 DPLL Input is BRG1 Output
6216 * <5..3> 100 TxCLK comes from BRG0
6217 * <2..0> 100 RxCLK comes from BRG0
6218 *
6219 * 0000 1111 0110 0100 = 0x0f64
6220 */
6221
6222 usc_OutReg( info, CMCR, 0x0f64 );
6223
6224
6225 /*
6226 * Write 16-bit Time Constant for BRG0
6227 * Time Constant = (ClkSpeed / data_rate) - 1
6228 * ClkSpeed = 921600 (ISA), 691200 (PCI)
6229 */
6230
6231 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
6232 usc_OutReg( info, TC0R, (u16)((691200/data_rate) - 1) );
6233 else
6234 usc_OutReg( info, TC0R, (u16)((921600/data_rate) - 1) );
6235
6236
6237 /*
6238 * Hardware Configuration Register (HCR)
6239 * Clear Bit 1, BRG0 mode = Continuous
6240 * Set Bit 0 to enable BRG0.
6241 */
6242
6243 usc_OutReg( info, HCR,
6244 (u16)((usc_InReg( info, HCR ) & ~BIT1) | BIT0) );
6245
6246
6247 /* Input/Output Control Reg, <2..0> = 100, Drive RxC pin with BRG0 */
6248
6249 usc_OutReg( info, IOCR,
6250 (u16)((usc_InReg(info, IOCR) & 0xfff8) | 0x0004) );
6251 } else {
6252 /* data rate == 0 so turn off BRG0 */
6253 usc_OutReg( info, HCR, (u16)(usc_InReg( info, HCR ) & ~BIT0) );
6254 }
6255
6256 } /* end of usc_enable_async_clock() */
6257
6258 /*
6259 * Buffer Structures:
6260 *
6261 * Normal memory access uses virtual addresses that can make discontiguous
6262 * physical memory pages appear to be contiguous in the virtual address
6263 * space (the processors memory mapping handles the conversions).
6264 *
6265 * DMA transfers require physically contiguous memory. This is because
6266 * the DMA system controller and DMA bus masters deal with memory using
6267 * only physical addresses.
6268 *
6269 * This causes a problem under Windows NT when large DMA buffers are
6270 * needed. Fragmentation of the nonpaged pool prevents allocations of
6271 * physically contiguous buffers larger than the PAGE_SIZE.
6272 *
6273 * However the 16C32 supports Bus Master Scatter/Gather DMA which
6274 * allows DMA transfers to physically discontiguous buffers. Information
6275 * about each data transfer buffer is contained in a memory structure
6276 * called a 'buffer entry'. A list of buffer entries is maintained
6277 * to track and control the use of the data transfer buffers.
6278 *
6279 * To support this strategy we will allocate sufficient PAGE_SIZE
6280 * contiguous memory buffers to allow for the total required buffer
6281 * space.
6282 *
6283 * The 16C32 accesses the list of buffer entries using Bus Master
6284 * DMA. Control information is read from the buffer entries by the
6285 * 16C32 to control data transfers. status information is written to
6286 * the buffer entries by the 16C32 to indicate the status of completed
6287 * transfers.
6288 *
6289 * The CPU writes control information to the buffer entries to control
6290 * the 16C32 and reads status information from the buffer entries to
6291 * determine information about received and transmitted frames.
6292 *
6293 * Because the CPU and 16C32 (adapter) both need simultaneous access
6294 * to the buffer entries, the buffer entry memory is allocated with
6295 * HalAllocateCommonBuffer(). This restricts the size of the buffer
6296 * entry list to PAGE_SIZE.
6297 *
6298 * The actual data buffers on the other hand will only be accessed
6299 * by the CPU or the adapter but not by both simultaneously. This allows
6300 * Scatter/Gather packet based DMA procedures for using physically
6301 * discontiguous pages.
6302 */
6303
6304 /*
6305 * mgsl_reset_tx_dma_buffers()
6306 *
6307 * Set the count for all transmit buffers to 0 to indicate the
6308 * buffer is available for use and set the current buffer to the
6309 * first buffer. This effectively makes all buffers free and
6310 * discards any data in buffers.
6311 *
6312 * Arguments: info pointer to device instance data
6313 * Return Value: None
6314 */
6315 static void mgsl_reset_tx_dma_buffers( struct mgsl_struct *info )
6316 {
6317 unsigned int i;
6318
6319 for ( i = 0; i < info->tx_buffer_count; i++ ) {
6320 *((unsigned long *)&(info->tx_buffer_list[i].count)) = 0;
6321 }
6322
6323 info->current_tx_buffer = 0;
6324 info->start_tx_dma_buffer = 0;
6325 info->tx_dma_buffers_used = 0;
6326
6327 info->get_tx_holding_index = 0;
6328 info->put_tx_holding_index = 0;
6329 info->tx_holding_count = 0;
6330
6331 } /* end of mgsl_reset_tx_dma_buffers() */
6332
6333 /*
6334 * num_free_tx_dma_buffers()
6335 *
6336 * returns the number of free tx dma buffers available
6337 *
6338 * Arguments: info pointer to device instance data
6339 * Return Value: number of free tx dma buffers
6340 */
6341 static int num_free_tx_dma_buffers(struct mgsl_struct *info)
6342 {
6343 return info->tx_buffer_count - info->tx_dma_buffers_used;
6344 }
6345
6346 /*
6347 * mgsl_reset_rx_dma_buffers()
6348 *
6349 * Set the count for all receive buffers to DMABUFFERSIZE
6350 * and set the current buffer to the first buffer. This effectively
6351 * makes all buffers free and discards any data in buffers.
6352 *
6353 * Arguments: info pointer to device instance data
6354 * Return Value: None
6355 */
6356 static void mgsl_reset_rx_dma_buffers( struct mgsl_struct *info )
6357 {
6358 unsigned int i;
6359
6360 for ( i = 0; i < info->rx_buffer_count; i++ ) {
6361 *((unsigned long *)&(info->rx_buffer_list[i].count)) = DMABUFFERSIZE;
6362 // info->rx_buffer_list[i].count = DMABUFFERSIZE;
6363 // info->rx_buffer_list[i].status = 0;
6364 }
6365
6366 info->current_rx_buffer = 0;
6367
6368 } /* end of mgsl_reset_rx_dma_buffers() */
6369
6370 /*
6371 * mgsl_free_rx_frame_buffers()
6372 *
6373 * Free the receive buffers used by a received SDLC
6374 * frame such that the buffers can be reused.
6375 *
6376 * Arguments:
6377 *
6378 * info pointer to device instance data
6379 * StartIndex index of 1st receive buffer of frame
6380 * EndIndex index of last receive buffer of frame
6381 *
6382 * Return Value: None
6383 */
6384 static void mgsl_free_rx_frame_buffers( struct mgsl_struct *info, unsigned int StartIndex, unsigned int EndIndex )
6385 {
6386 bool Done = false;
6387 DMABUFFERENTRY *pBufEntry;
6388 unsigned int Index;
6389
6390 /* Starting with 1st buffer entry of the frame clear the status */
6391 /* field and set the count field to DMA Buffer Size. */
6392
6393 Index = StartIndex;
6394
6395 while( !Done ) {
6396 pBufEntry = &(info->rx_buffer_list[Index]);
6397
6398 if ( Index == EndIndex ) {
6399 /* This is the last buffer of the frame! */
6400 Done = true;
6401 }
6402
6403 /* reset current buffer for reuse */
6404 // pBufEntry->status = 0;
6405 // pBufEntry->count = DMABUFFERSIZE;
6406 *((unsigned long *)&(pBufEntry->count)) = DMABUFFERSIZE;
6407
6408 /* advance to next buffer entry in linked list */
6409 Index++;
6410 if ( Index == info->rx_buffer_count )
6411 Index = 0;
6412 }
6413
6414 /* set current buffer to next buffer after last buffer of frame */
6415 info->current_rx_buffer = Index;
6416
6417 } /* end of free_rx_frame_buffers() */
6418
6419 /* mgsl_get_rx_frame()
6420 *
6421 * This function attempts to return a received SDLC frame from the
6422 * receive DMA buffers. Only frames received without errors are returned.
6423 *
6424 * Arguments: info pointer to device extension
6425 * Return Value: true if frame returned, otherwise false
6426 */
6427 static bool mgsl_get_rx_frame(struct mgsl_struct *info)
6428 {
6429 unsigned int StartIndex, EndIndex; /* index of 1st and last buffers of Rx frame */
6430 unsigned short status;
6431 DMABUFFERENTRY *pBufEntry;
6432 unsigned int framesize = 0;
6433 bool ReturnCode = false;
6434 unsigned long flags;
6435 struct tty_struct *tty = info->port.tty;
6436 bool return_frame = false;
6437
6438 /*
6439 * current_rx_buffer points to the 1st buffer of the next available
6440 * receive frame. To find the last buffer of the frame look for
6441 * a non-zero status field in the buffer entries. (The status
6442 * field is set by the 16C32 after completing a receive frame.
6443 */
6444
6445 StartIndex = EndIndex = info->current_rx_buffer;
6446
6447 while( !info->rx_buffer_list[EndIndex].status ) {
6448 /*
6449 * If the count field of the buffer entry is non-zero then
6450 * this buffer has not been used. (The 16C32 clears the count
6451 * field when it starts using the buffer.) If an unused buffer
6452 * is encountered then there are no frames available.
6453 */
6454
6455 if ( info->rx_buffer_list[EndIndex].count )
6456 goto Cleanup;
6457
6458 /* advance to next buffer entry in linked list */
6459 EndIndex++;
6460 if ( EndIndex == info->rx_buffer_count )
6461 EndIndex = 0;
6462
6463 /* if entire list searched then no frame available */
6464 if ( EndIndex == StartIndex ) {
6465 /* If this occurs then something bad happened,
6466 * all buffers have been 'used' but none mark
6467 * the end of a frame. Reset buffers and receiver.
6468 */
6469
6470 if ( info->rx_enabled ){
6471 spin_lock_irqsave(&info->irq_spinlock,flags);
6472 usc_start_receiver(info);
6473 spin_unlock_irqrestore(&info->irq_spinlock,flags);
6474 }
6475 goto Cleanup;
6476 }
6477 }
6478
6479
6480 /* check status of receive frame */
6481
6482 status = info->rx_buffer_list[EndIndex].status;
6483
6484 if ( status & (RXSTATUS_SHORT_FRAME | RXSTATUS_OVERRUN |
6485 RXSTATUS_CRC_ERROR | RXSTATUS_ABORT) ) {
6486 if ( status & RXSTATUS_SHORT_FRAME )
6487 info->icount.rxshort++;
6488 else if ( status & RXSTATUS_ABORT )
6489 info->icount.rxabort++;
6490 else if ( status & RXSTATUS_OVERRUN )
6491 info->icount.rxover++;
6492 else {
6493 info->icount.rxcrc++;
6494 if ( info->params.crc_type & HDLC_CRC_RETURN_EX )
6495 return_frame = true;
6496 }
6497 framesize = 0;
6498 #if SYNCLINK_GENERIC_HDLC
6499 {
6500 info->netdev->stats.rx_errors++;
6501 info->netdev->stats.rx_frame_errors++;
6502 }
6503 #endif
6504 } else
6505 return_frame = true;
6506
6507 if ( return_frame ) {
6508 /* receive frame has no errors, get frame size.
6509 * The frame size is the starting value of the RCC (which was
6510 * set to 0xffff) minus the ending value of the RCC (decremented
6511 * once for each receive character) minus 2 for the 16-bit CRC.
6512 */
6513
6514 framesize = RCLRVALUE - info->rx_buffer_list[EndIndex].rcc;
6515
6516 /* adjust frame size for CRC if any */
6517 if ( info->params.crc_type == HDLC_CRC_16_CCITT )
6518 framesize -= 2;
6519 else if ( info->params.crc_type == HDLC_CRC_32_CCITT )
6520 framesize -= 4;
6521 }
6522
6523 if ( debug_level >= DEBUG_LEVEL_BH )
6524 printk("%s(%d):mgsl_get_rx_frame(%s) status=%04X size=%d\n",
6525 __FILE__,__LINE__,info->device_name,status,framesize);
6526
6527 if ( debug_level >= DEBUG_LEVEL_DATA )
6528 mgsl_trace_block(info,info->rx_buffer_list[StartIndex].virt_addr,
6529 min_t(int, framesize, DMABUFFERSIZE),0);
6530
6531 if (framesize) {
6532 if ( ( (info->params.crc_type & HDLC_CRC_RETURN_EX) &&
6533 ((framesize+1) > info->max_frame_size) ) ||
6534 (framesize > info->max_frame_size) )
6535 info->icount.rxlong++;
6536 else {
6537 /* copy dma buffer(s) to contiguous intermediate buffer */
6538 int copy_count = framesize;
6539 int index = StartIndex;
6540 unsigned char *ptmp = info->intermediate_rxbuffer;
6541
6542 if ( !(status & RXSTATUS_CRC_ERROR))
6543 info->icount.rxok++;
6544
6545 while(copy_count) {
6546 int partial_count;
6547 if ( copy_count > DMABUFFERSIZE )
6548 partial_count = DMABUFFERSIZE;
6549 else
6550 partial_count = copy_count;
6551
6552 pBufEntry = &(info->rx_buffer_list[index]);
6553 memcpy( ptmp, pBufEntry->virt_addr, partial_count );
6554 ptmp += partial_count;
6555 copy_count -= partial_count;
6556
6557 if ( ++index == info->rx_buffer_count )
6558 index = 0;
6559 }
6560
6561 if ( info->params.crc_type & HDLC_CRC_RETURN_EX ) {
6562 ++framesize;
6563 *ptmp = (status & RXSTATUS_CRC_ERROR ?
6564 RX_CRC_ERROR :
6565 RX_OK);
6566
6567 if ( debug_level >= DEBUG_LEVEL_DATA )
6568 printk("%s(%d):mgsl_get_rx_frame(%s) rx frame status=%d\n",
6569 __FILE__,__LINE__,info->device_name,
6570 *ptmp);
6571 }
6572
6573 #if SYNCLINK_GENERIC_HDLC
6574 if (info->netcount)
6575 hdlcdev_rx(info,info->intermediate_rxbuffer,framesize);
6576 else
6577 #endif
6578 ldisc_receive_buf(tty, info->intermediate_rxbuffer, info->flag_buf, framesize);
6579 }
6580 }
6581 /* Free the buffers used by this frame. */
6582 mgsl_free_rx_frame_buffers( info, StartIndex, EndIndex );
6583
6584 ReturnCode = true;
6585
6586 Cleanup:
6587
6588 if ( info->rx_enabled && info->rx_overflow ) {
6589 /* The receiver needs to restarted because of
6590 * a receive overflow (buffer or FIFO). If the
6591 * receive buffers are now empty, then restart receiver.
6592 */
6593
6594 if ( !info->rx_buffer_list[EndIndex].status &&
6595 info->rx_buffer_list[EndIndex].count ) {
6596 spin_lock_irqsave(&info->irq_spinlock,flags);
6597 usc_start_receiver(info);
6598 spin_unlock_irqrestore(&info->irq_spinlock,flags);
6599 }
6600 }
6601
6602 return ReturnCode;
6603
6604 } /* end of mgsl_get_rx_frame() */
6605
6606 /* mgsl_get_raw_rx_frame()
6607 *
6608 * This function attempts to return a received frame from the
6609 * receive DMA buffers when running in external loop mode. In this mode,
6610 * we will return at most one DMABUFFERSIZE frame to the application.
6611 * The USC receiver is triggering off of DCD going active to start a new
6612 * frame, and DCD going inactive to terminate the frame (similar to
6613 * processing a closing flag character).
6614 *
6615 * In this routine, we will return DMABUFFERSIZE "chunks" at a time.
6616 * If DCD goes inactive, the last Rx DMA Buffer will have a non-zero
6617 * status field and the RCC field will indicate the length of the
6618 * entire received frame. We take this RCC field and get the modulus
6619 * of RCC and DMABUFFERSIZE to determine if number of bytes in the
6620 * last Rx DMA buffer and return that last portion of the frame.
6621 *
6622 * Arguments: info pointer to device extension
6623 * Return Value: true if frame returned, otherwise false
6624 */
6625 static bool mgsl_get_raw_rx_frame(struct mgsl_struct *info)
6626 {
6627 unsigned int CurrentIndex, NextIndex;
6628 unsigned short status;
6629 DMABUFFERENTRY *pBufEntry;
6630 unsigned int framesize = 0;
6631 bool ReturnCode = false;
6632 unsigned long flags;
6633 struct tty_struct *tty = info->port.tty;
6634
6635 /*
6636 * current_rx_buffer points to the 1st buffer of the next available
6637 * receive frame. The status field is set by the 16C32 after
6638 * completing a receive frame. If the status field of this buffer
6639 * is zero, either the USC is still filling this buffer or this
6640 * is one of a series of buffers making up a received frame.
6641 *
6642 * If the count field of this buffer is zero, the USC is either
6643 * using this buffer or has used this buffer. Look at the count
6644 * field of the next buffer. If that next buffer's count is
6645 * non-zero, the USC is still actively using the current buffer.
6646 * Otherwise, if the next buffer's count field is zero, the
6647 * current buffer is complete and the USC is using the next
6648 * buffer.
6649 */
6650 CurrentIndex = NextIndex = info->current_rx_buffer;
6651 ++NextIndex;
6652 if ( NextIndex == info->rx_buffer_count )
6653 NextIndex = 0;
6654
6655 if ( info->rx_buffer_list[CurrentIndex].status != 0 ||
6656 (info->rx_buffer_list[CurrentIndex].count == 0 &&
6657 info->rx_buffer_list[NextIndex].count == 0)) {
6658 /*
6659 * Either the status field of this dma buffer is non-zero
6660 * (indicating the last buffer of a receive frame) or the next
6661 * buffer is marked as in use -- implying this buffer is complete
6662 * and an intermediate buffer for this received frame.
6663 */
6664
6665 status = info->rx_buffer_list[CurrentIndex].status;
6666
6667 if ( status & (RXSTATUS_SHORT_FRAME | RXSTATUS_OVERRUN |
6668 RXSTATUS_CRC_ERROR | RXSTATUS_ABORT) ) {
6669 if ( status & RXSTATUS_SHORT_FRAME )
6670 info->icount.rxshort++;
6671 else if ( status & RXSTATUS_ABORT )
6672 info->icount.rxabort++;
6673 else if ( status & RXSTATUS_OVERRUN )
6674 info->icount.rxover++;
6675 else
6676 info->icount.rxcrc++;
6677 framesize = 0;
6678 } else {
6679 /*
6680 * A receive frame is available, get frame size and status.
6681 *
6682 * The frame size is the starting value of the RCC (which was
6683 * set to 0xffff) minus the ending value of the RCC (decremented
6684 * once for each receive character) minus 2 or 4 for the 16-bit
6685 * or 32-bit CRC.
6686 *
6687 * If the status field is zero, this is an intermediate buffer.
6688 * It's size is 4K.
6689 *
6690 * If the DMA Buffer Entry's Status field is non-zero, the
6691 * receive operation completed normally (ie: DCD dropped). The
6692 * RCC field is valid and holds the received frame size.
6693 * It is possible that the RCC field will be zero on a DMA buffer
6694 * entry with a non-zero status. This can occur if the total
6695 * frame size (number of bytes between the time DCD goes active
6696 * to the time DCD goes inactive) exceeds 65535 bytes. In this
6697 * case the 16C32 has underrun on the RCC count and appears to
6698 * stop updating this counter to let us know the actual received
6699 * frame size. If this happens (non-zero status and zero RCC),
6700 * simply return the entire RxDMA Buffer
6701 */
6702 if ( status ) {
6703 /*
6704 * In the event that the final RxDMA Buffer is
6705 * terminated with a non-zero status and the RCC
6706 * field is zero, we interpret this as the RCC
6707 * having underflowed (received frame > 65535 bytes).
6708 *
6709 * Signal the event to the user by passing back
6710 * a status of RxStatus_CrcError returning the full
6711 * buffer and let the app figure out what data is
6712 * actually valid
6713 */
6714 if ( info->rx_buffer_list[CurrentIndex].rcc )
6715 framesize = RCLRVALUE - info->rx_buffer_list[CurrentIndex].rcc;
6716 else
6717 framesize = DMABUFFERSIZE;
6718 }
6719 else
6720 framesize = DMABUFFERSIZE;
6721 }
6722
6723 if ( framesize > DMABUFFERSIZE ) {
6724 /*
6725 * if running in raw sync mode, ISR handler for
6726 * End Of Buffer events terminates all buffers at 4K.
6727 * If this frame size is said to be >4K, get the
6728 * actual number of bytes of the frame in this buffer.
6729 */
6730 framesize = framesize % DMABUFFERSIZE;
6731 }
6732
6733
6734 if ( debug_level >= DEBUG_LEVEL_BH )
6735 printk("%s(%d):mgsl_get_raw_rx_frame(%s) status=%04X size=%d\n",
6736 __FILE__,__LINE__,info->device_name,status,framesize);
6737
6738 if ( debug_level >= DEBUG_LEVEL_DATA )
6739 mgsl_trace_block(info,info->rx_buffer_list[CurrentIndex].virt_addr,
6740 min_t(int, framesize, DMABUFFERSIZE),0);
6741
6742 if (framesize) {
6743 /* copy dma buffer(s) to contiguous intermediate buffer */
6744 /* NOTE: we never copy more than DMABUFFERSIZE bytes */
6745
6746 pBufEntry = &(info->rx_buffer_list[CurrentIndex]);
6747 memcpy( info->intermediate_rxbuffer, pBufEntry->virt_addr, framesize);
6748 info->icount.rxok++;
6749
6750 ldisc_receive_buf(tty, info->intermediate_rxbuffer, info->flag_buf, framesize);
6751 }
6752
6753 /* Free the buffers used by this frame. */
6754 mgsl_free_rx_frame_buffers( info, CurrentIndex, CurrentIndex );
6755
6756 ReturnCode = true;
6757 }
6758
6759
6760 if ( info->rx_enabled && info->rx_overflow ) {
6761 /* The receiver needs to restarted because of
6762 * a receive overflow (buffer or FIFO). If the
6763 * receive buffers are now empty, then restart receiver.
6764 */
6765
6766 if ( !info->rx_buffer_list[CurrentIndex].status &&
6767 info->rx_buffer_list[CurrentIndex].count ) {
6768 spin_lock_irqsave(&info->irq_spinlock,flags);
6769 usc_start_receiver(info);
6770 spin_unlock_irqrestore(&info->irq_spinlock,flags);
6771 }
6772 }
6773
6774 return ReturnCode;
6775
6776 } /* end of mgsl_get_raw_rx_frame() */
6777
6778 /* mgsl_load_tx_dma_buffer()
6779 *
6780 * Load the transmit DMA buffer with the specified data.
6781 *
6782 * Arguments:
6783 *
6784 * info pointer to device extension
6785 * Buffer pointer to buffer containing frame to load
6786 * BufferSize size in bytes of frame in Buffer
6787 *
6788 * Return Value: None
6789 */
6790 static void mgsl_load_tx_dma_buffer(struct mgsl_struct *info,
6791 const char *Buffer, unsigned int BufferSize)
6792 {
6793 unsigned short Copycount;
6794 unsigned int i = 0;
6795 DMABUFFERENTRY *pBufEntry;
6796
6797 if ( debug_level >= DEBUG_LEVEL_DATA )
6798 mgsl_trace_block(info,Buffer, min_t(int, BufferSize, DMABUFFERSIZE), 1);
6799
6800 if (info->params.flags & HDLC_FLAG_HDLC_LOOPMODE) {
6801 /* set CMR:13 to start transmit when
6802 * next GoAhead (abort) is received
6803 */
6804 info->cmr_value |= BIT13;
6805 }
6806
6807 /* begin loading the frame in the next available tx dma
6808 * buffer, remember it's starting location for setting
6809 * up tx dma operation
6810 */
6811 i = info->current_tx_buffer;
6812 info->start_tx_dma_buffer = i;
6813
6814 /* Setup the status and RCC (Frame Size) fields of the 1st */
6815 /* buffer entry in the transmit DMA buffer list. */
6816
6817 info->tx_buffer_list[i].status = info->cmr_value & 0xf000;
6818 info->tx_buffer_list[i].rcc = BufferSize;
6819 info->tx_buffer_list[i].count = BufferSize;
6820
6821 /* Copy frame data from 1st source buffer to the DMA buffers. */
6822 /* The frame data may span multiple DMA buffers. */
6823
6824 while( BufferSize ){
6825 /* Get a pointer to next DMA buffer entry. */
6826 pBufEntry = &info->tx_buffer_list[i++];
6827
6828 if ( i == info->tx_buffer_count )
6829 i=0;
6830
6831 /* Calculate the number of bytes that can be copied from */
6832 /* the source buffer to this DMA buffer. */
6833 if ( BufferSize > DMABUFFERSIZE )
6834 Copycount = DMABUFFERSIZE;
6835 else
6836 Copycount = BufferSize;
6837
6838 /* Actually copy data from source buffer to DMA buffer. */
6839 /* Also set the data count for this individual DMA buffer. */
6840 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
6841 mgsl_load_pci_memory(pBufEntry->virt_addr, Buffer,Copycount);
6842 else
6843 memcpy(pBufEntry->virt_addr, Buffer, Copycount);
6844
6845 pBufEntry->count = Copycount;
6846
6847 /* Advance source pointer and reduce remaining data count. */
6848 Buffer += Copycount;
6849 BufferSize -= Copycount;
6850
6851 ++info->tx_dma_buffers_used;
6852 }
6853
6854 /* remember next available tx dma buffer */
6855 info->current_tx_buffer = i;
6856
6857 } /* end of mgsl_load_tx_dma_buffer() */
6858
6859 /*
6860 * mgsl_register_test()
6861 *
6862 * Performs a register test of the 16C32.
6863 *
6864 * Arguments: info pointer to device instance data
6865 * Return Value: true if test passed, otherwise false
6866 */
6867 static bool mgsl_register_test( struct mgsl_struct *info )
6868 {
6869 static unsigned short BitPatterns[] =
6870 { 0x0000, 0xffff, 0xaaaa, 0x5555, 0x1234, 0x6969, 0x9696, 0x0f0f };
6871 static unsigned int Patterncount = ARRAY_SIZE(BitPatterns);
6872 unsigned int i;
6873 bool rc = true;
6874 unsigned long flags;
6875
6876 spin_lock_irqsave(&info->irq_spinlock,flags);
6877 usc_reset(info);
6878
6879 /* Verify the reset state of some registers. */
6880
6881 if ( (usc_InReg( info, SICR ) != 0) ||
6882 (usc_InReg( info, IVR ) != 0) ||
6883 (usc_InDmaReg( info, DIVR ) != 0) ){
6884 rc = false;
6885 }
6886
6887 if ( rc ){
6888 /* Write bit patterns to various registers but do it out of */
6889 /* sync, then read back and verify values. */
6890
6891 for ( i = 0 ; i < Patterncount ; i++ ) {
6892 usc_OutReg( info, TC0R, BitPatterns[i] );
6893 usc_OutReg( info, TC1R, BitPatterns[(i+1)%Patterncount] );
6894 usc_OutReg( info, TCLR, BitPatterns[(i+2)%Patterncount] );
6895 usc_OutReg( info, RCLR, BitPatterns[(i+3)%Patterncount] );
6896 usc_OutReg( info, RSR, BitPatterns[(i+4)%Patterncount] );
6897 usc_OutDmaReg( info, TBCR, BitPatterns[(i+5)%Patterncount] );
6898
6899 if ( (usc_InReg( info, TC0R ) != BitPatterns[i]) ||
6900 (usc_InReg( info, TC1R ) != BitPatterns[(i+1)%Patterncount]) ||
6901 (usc_InReg( info, TCLR ) != BitPatterns[(i+2)%Patterncount]) ||
6902 (usc_InReg( info, RCLR ) != BitPatterns[(i+3)%Patterncount]) ||
6903 (usc_InReg( info, RSR ) != BitPatterns[(i+4)%Patterncount]) ||
6904 (usc_InDmaReg( info, TBCR ) != BitPatterns[(i+5)%Patterncount]) ){
6905 rc = false;
6906 break;
6907 }
6908 }
6909 }
6910
6911 usc_reset(info);
6912 spin_unlock_irqrestore(&info->irq_spinlock,flags);
6913
6914 return rc;
6915
6916 } /* end of mgsl_register_test() */
6917
6918 /* mgsl_irq_test() Perform interrupt test of the 16C32.
6919 *
6920 * Arguments: info pointer to device instance data
6921 * Return Value: true if test passed, otherwise false
6922 */
6923 static bool mgsl_irq_test( struct mgsl_struct *info )
6924 {
6925 unsigned long EndTime;
6926 unsigned long flags;
6927
6928 spin_lock_irqsave(&info->irq_spinlock,flags);
6929 usc_reset(info);
6930
6931 /*
6932 * Setup 16C32 to interrupt on TxC pin (14MHz clock) transition.
6933 * The ISR sets irq_occurred to true.
6934 */
6935
6936 info->irq_occurred = false;
6937
6938 /* Enable INTEN gate for ISA adapter (Port 6, Bit12) */
6939 /* Enable INTEN (Port 6, Bit12) */
6940 /* This connects the IRQ request signal to the ISA bus */
6941 /* on the ISA adapter. This has no effect for the PCI adapter */
6942 usc_OutReg( info, PCR, (unsigned short)((usc_InReg(info, PCR) | BIT13) & ~BIT12) );
6943
6944 usc_EnableMasterIrqBit(info);
6945 usc_EnableInterrupts(info, IO_PIN);
6946 usc_ClearIrqPendingBits(info, IO_PIN);
6947
6948 usc_UnlatchIostatusBits(info, MISCSTATUS_TXC_LATCHED);
6949 usc_EnableStatusIrqs(info, SICR_TXC_ACTIVE + SICR_TXC_INACTIVE);
6950
6951 spin_unlock_irqrestore(&info->irq_spinlock,flags);
6952
6953 EndTime=100;
6954 while( EndTime-- && !info->irq_occurred ) {
6955 msleep_interruptible(10);
6956 }
6957
6958 spin_lock_irqsave(&info->irq_spinlock,flags);
6959 usc_reset(info);
6960 spin_unlock_irqrestore(&info->irq_spinlock,flags);
6961
6962 return info->irq_occurred;
6963
6964 } /* end of mgsl_irq_test() */
6965
6966 /* mgsl_dma_test()
6967 *
6968 * Perform a DMA test of the 16C32. A small frame is
6969 * transmitted via DMA from a transmit buffer to a receive buffer
6970 * using single buffer DMA mode.
6971 *
6972 * Arguments: info pointer to device instance data
6973 * Return Value: true if test passed, otherwise false
6974 */
6975 static bool mgsl_dma_test( struct mgsl_struct *info )
6976 {
6977 unsigned short FifoLevel;
6978 unsigned long phys_addr;
6979 unsigned int FrameSize;
6980 unsigned int i;
6981 char *TmpPtr;
6982 bool rc = true;
6983 unsigned short status=0;
6984 unsigned long EndTime;
6985 unsigned long flags;
6986 MGSL_PARAMS tmp_params;
6987
6988 /* save current port options */
6989 memcpy(&tmp_params,&info->params,sizeof(MGSL_PARAMS));
6990 /* load default port options */
6991 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
6992
6993 #define TESTFRAMESIZE 40
6994
6995 spin_lock_irqsave(&info->irq_spinlock,flags);
6996
6997 /* setup 16C32 for SDLC DMA transfer mode */
6998
6999 usc_reset(info);
7000 usc_set_sdlc_mode(info);
7001 usc_enable_loopback(info,1);
7002
7003 /* Reprogram the RDMR so that the 16C32 does NOT clear the count
7004 * field of the buffer entry after fetching buffer address. This
7005 * way we can detect a DMA failure for a DMA read (which should be
7006 * non-destructive to system memory) before we try and write to
7007 * memory (where a failure could corrupt system memory).
7008 */
7009
7010 /* Receive DMA mode Register (RDMR)
7011 *
7012 * <15..14> 11 DMA mode = Linked List Buffer mode
7013 * <13> 1 RSBinA/L = store Rx status Block in List entry
7014 * <12> 0 1 = Clear count of List Entry after fetching
7015 * <11..10> 00 Address mode = Increment
7016 * <9> 1 Terminate Buffer on RxBound
7017 * <8> 0 Bus Width = 16bits
7018 * <7..0> ? status Bits (write as 0s)
7019 *
7020 * 1110 0010 0000 0000 = 0xe200
7021 */
7022
7023 usc_OutDmaReg( info, RDMR, 0xe200 );
7024
7025 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7026
7027
7028 /* SETUP TRANSMIT AND RECEIVE DMA BUFFERS */
7029
7030 FrameSize = TESTFRAMESIZE;
7031
7032 /* setup 1st transmit buffer entry: */
7033 /* with frame size and transmit control word */
7034
7035 info->tx_buffer_list[0].count = FrameSize;
7036 info->tx_buffer_list[0].rcc = FrameSize;
7037 info->tx_buffer_list[0].status = 0x4000;
7038
7039 /* build a transmit frame in 1st transmit DMA buffer */
7040
7041 TmpPtr = info->tx_buffer_list[0].virt_addr;
7042 for (i = 0; i < FrameSize; i++ )
7043 *TmpPtr++ = i;
7044
7045 /* setup 1st receive buffer entry: */
7046 /* clear status, set max receive buffer size */
7047
7048 info->rx_buffer_list[0].status = 0;
7049 info->rx_buffer_list[0].count = FrameSize + 4;
7050
7051 /* zero out the 1st receive buffer */
7052
7053 memset( info->rx_buffer_list[0].virt_addr, 0, FrameSize + 4 );
7054
7055 /* Set count field of next buffer entries to prevent */
7056 /* 16C32 from using buffers after the 1st one. */
7057
7058 info->tx_buffer_list[1].count = 0;
7059 info->rx_buffer_list[1].count = 0;
7060
7061
7062 /***************************/
7063 /* Program 16C32 receiver. */
7064 /***************************/
7065
7066 spin_lock_irqsave(&info->irq_spinlock,flags);
7067
7068 /* setup DMA transfers */
7069 usc_RTCmd( info, RTCmd_PurgeRxFifo );
7070
7071 /* program 16C32 receiver with physical address of 1st DMA buffer entry */
7072 phys_addr = info->rx_buffer_list[0].phys_entry;
7073 usc_OutDmaReg( info, NRARL, (unsigned short)phys_addr );
7074 usc_OutDmaReg( info, NRARU, (unsigned short)(phys_addr >> 16) );
7075
7076 /* Clear the Rx DMA status bits (read RDMR) and start channel */
7077 usc_InDmaReg( info, RDMR );
7078 usc_DmaCmd( info, DmaCmd_InitRxChannel );
7079
7080 /* Enable Receiver (RMR <1..0> = 10) */
7081 usc_OutReg( info, RMR, (unsigned short)((usc_InReg(info, RMR) & 0xfffc) | 0x0002) );
7082
7083 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7084
7085
7086 /*************************************************************/
7087 /* WAIT FOR RECEIVER TO DMA ALL PARAMETERS FROM BUFFER ENTRY */
7088 /*************************************************************/
7089
7090 /* Wait 100ms for interrupt. */
7091 EndTime = jiffies + msecs_to_jiffies(100);
7092
7093 for(;;) {
7094 if (time_after(jiffies, EndTime)) {
7095 rc = false;
7096 break;
7097 }
7098
7099 spin_lock_irqsave(&info->irq_spinlock,flags);
7100 status = usc_InDmaReg( info, RDMR );
7101 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7102
7103 if ( !(status & BIT4) && (status & BIT5) ) {
7104 /* INITG (BIT 4) is inactive (no entry read in progress) AND */
7105 /* BUSY (BIT 5) is active (channel still active). */
7106 /* This means the buffer entry read has completed. */
7107 break;
7108 }
7109 }
7110
7111
7112 /******************************/
7113 /* Program 16C32 transmitter. */
7114 /******************************/
7115
7116 spin_lock_irqsave(&info->irq_spinlock,flags);
7117
7118 /* Program the Transmit Character Length Register (TCLR) */
7119 /* and clear FIFO (TCC is loaded with TCLR on FIFO clear) */
7120
7121 usc_OutReg( info, TCLR, (unsigned short)info->tx_buffer_list[0].count );
7122 usc_RTCmd( info, RTCmd_PurgeTxFifo );
7123
7124 /* Program the address of the 1st DMA Buffer Entry in linked list */
7125
7126 phys_addr = info->tx_buffer_list[0].phys_entry;
7127 usc_OutDmaReg( info, NTARL, (unsigned short)phys_addr );
7128 usc_OutDmaReg( info, NTARU, (unsigned short)(phys_addr >> 16) );
7129
7130 /* unlatch Tx status bits, and start transmit channel. */
7131
7132 usc_OutReg( info, TCSR, (unsigned short)(( usc_InReg(info, TCSR) & 0x0f00) | 0xfa) );
7133 usc_DmaCmd( info, DmaCmd_InitTxChannel );
7134
7135 /* wait for DMA controller to fill transmit FIFO */
7136
7137 usc_TCmd( info, TCmd_SelectTicrTxFifostatus );
7138
7139 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7140
7141
7142 /**********************************/
7143 /* WAIT FOR TRANSMIT FIFO TO FILL */
7144 /**********************************/
7145
7146 /* Wait 100ms */
7147 EndTime = jiffies + msecs_to_jiffies(100);
7148
7149 for(;;) {
7150 if (time_after(jiffies, EndTime)) {
7151 rc = false;
7152 break;
7153 }
7154
7155 spin_lock_irqsave(&info->irq_spinlock,flags);
7156 FifoLevel = usc_InReg(info, TICR) >> 8;
7157 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7158
7159 if ( FifoLevel < 16 )
7160 break;
7161 else
7162 if ( FrameSize < 32 ) {
7163 /* This frame is smaller than the entire transmit FIFO */
7164 /* so wait for the entire frame to be loaded. */
7165 if ( FifoLevel <= (32 - FrameSize) )
7166 break;
7167 }
7168 }
7169
7170
7171 if ( rc )
7172 {
7173 /* Enable 16C32 transmitter. */
7174
7175 spin_lock_irqsave(&info->irq_spinlock,flags);
7176
7177 /* Transmit mode Register (TMR), <1..0> = 10, Enable Transmitter */
7178 usc_TCmd( info, TCmd_SendFrame );
7179 usc_OutReg( info, TMR, (unsigned short)((usc_InReg(info, TMR) & 0xfffc) | 0x0002) );
7180
7181 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7182
7183
7184 /******************************/
7185 /* WAIT FOR TRANSMIT COMPLETE */
7186 /******************************/
7187
7188 /* Wait 100ms */
7189 EndTime = jiffies + msecs_to_jiffies(100);
7190
7191 /* While timer not expired wait for transmit complete */
7192
7193 spin_lock_irqsave(&info->irq_spinlock,flags);
7194 status = usc_InReg( info, TCSR );
7195 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7196
7197 while ( !(status & (BIT6 | BIT5 | BIT4 | BIT2 | BIT1)) ) {
7198 if (time_after(jiffies, EndTime)) {
7199 rc = false;
7200 break;
7201 }
7202
7203 spin_lock_irqsave(&info->irq_spinlock,flags);
7204 status = usc_InReg( info, TCSR );
7205 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7206 }
7207 }
7208
7209
7210 if ( rc ){
7211 /* CHECK FOR TRANSMIT ERRORS */
7212 if ( status & (BIT5 | BIT1) )
7213 rc = false;
7214 }
7215
7216 if ( rc ) {
7217 /* WAIT FOR RECEIVE COMPLETE */
7218
7219 /* Wait 100ms */
7220 EndTime = jiffies + msecs_to_jiffies(100);
7221
7222 /* Wait for 16C32 to write receive status to buffer entry. */
7223 status=info->rx_buffer_list[0].status;
7224 while ( status == 0 ) {
7225 if (time_after(jiffies, EndTime)) {
7226 rc = false;
7227 break;
7228 }
7229 status=info->rx_buffer_list[0].status;
7230 }
7231 }
7232
7233
7234 if ( rc ) {
7235 /* CHECK FOR RECEIVE ERRORS */
7236 status = info->rx_buffer_list[0].status;
7237
7238 if ( status & (BIT8 | BIT3 | BIT1) ) {
7239 /* receive error has occurred */
7240 rc = false;
7241 } else {
7242 if ( memcmp( info->tx_buffer_list[0].virt_addr ,
7243 info->rx_buffer_list[0].virt_addr, FrameSize ) ){
7244 rc = false;
7245 }
7246 }
7247 }
7248
7249 spin_lock_irqsave(&info->irq_spinlock,flags);
7250 usc_reset( info );
7251 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7252
7253 /* restore current port options */
7254 memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
7255
7256 return rc;
7257
7258 } /* end of mgsl_dma_test() */
7259
7260 /* mgsl_adapter_test()
7261 *
7262 * Perform the register, IRQ, and DMA tests for the 16C32.
7263 *
7264 * Arguments: info pointer to device instance data
7265 * Return Value: 0 if success, otherwise -ENODEV
7266 */
7267 static int mgsl_adapter_test( struct mgsl_struct *info )
7268 {
7269 if ( debug_level >= DEBUG_LEVEL_INFO )
7270 printk( "%s(%d):Testing device %s\n",
7271 __FILE__,__LINE__,info->device_name );
7272
7273 if ( !mgsl_register_test( info ) ) {
7274 info->init_error = DiagStatus_AddressFailure;
7275 printk( "%s(%d):Register test failure for device %s Addr=%04X\n",
7276 __FILE__,__LINE__,info->device_name, (unsigned short)(info->io_base) );
7277 return -ENODEV;
7278 }
7279
7280 if ( !mgsl_irq_test( info ) ) {
7281 info->init_error = DiagStatus_IrqFailure;
7282 printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
7283 __FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
7284 return -ENODEV;
7285 }
7286
7287 if ( !mgsl_dma_test( info ) ) {
7288 info->init_error = DiagStatus_DmaFailure;
7289 printk( "%s(%d):DMA test failure for device %s DMA=%d\n",
7290 __FILE__,__LINE__,info->device_name, (unsigned short)(info->dma_level) );
7291 return -ENODEV;
7292 }
7293
7294 if ( debug_level >= DEBUG_LEVEL_INFO )
7295 printk( "%s(%d):device %s passed diagnostics\n",
7296 __FILE__,__LINE__,info->device_name );
7297
7298 return 0;
7299
7300 } /* end of mgsl_adapter_test() */
7301
7302 /* mgsl_memory_test()
7303 *
7304 * Test the shared memory on a PCI adapter.
7305 *
7306 * Arguments: info pointer to device instance data
7307 * Return Value: true if test passed, otherwise false
7308 */
7309 static bool mgsl_memory_test( struct mgsl_struct *info )
7310 {
7311 static unsigned long BitPatterns[] =
7312 { 0x0, 0x55555555, 0xaaaaaaaa, 0x66666666, 0x99999999, 0xffffffff, 0x12345678 };
7313 unsigned long Patterncount = ARRAY_SIZE(BitPatterns);
7314 unsigned long i;
7315 unsigned long TestLimit = SHARED_MEM_ADDRESS_SIZE/sizeof(unsigned long);
7316 unsigned long * TestAddr;
7317
7318 if ( info->bus_type != MGSL_BUS_TYPE_PCI )
7319 return true;
7320
7321 TestAddr = (unsigned long *)info->memory_base;
7322
7323 /* Test data lines with test pattern at one location. */
7324
7325 for ( i = 0 ; i < Patterncount ; i++ ) {
7326 *TestAddr = BitPatterns[i];
7327 if ( *TestAddr != BitPatterns[i] )
7328 return false;
7329 }
7330
7331 /* Test address lines with incrementing pattern over */
7332 /* entire address range. */
7333
7334 for ( i = 0 ; i < TestLimit ; i++ ) {
7335 *TestAddr = i * 4;
7336 TestAddr++;
7337 }
7338
7339 TestAddr = (unsigned long *)info->memory_base;
7340
7341 for ( i = 0 ; i < TestLimit ; i++ ) {
7342 if ( *TestAddr != i * 4 )
7343 return false;
7344 TestAddr++;
7345 }
7346
7347 memset( info->memory_base, 0, SHARED_MEM_ADDRESS_SIZE );
7348
7349 return true;
7350
7351 } /* End Of mgsl_memory_test() */
7352
7353
7354 /* mgsl_load_pci_memory()
7355 *
7356 * Load a large block of data into the PCI shared memory.
7357 * Use this instead of memcpy() or memmove() to move data
7358 * into the PCI shared memory.
7359 *
7360 * Notes:
7361 *
7362 * This function prevents the PCI9050 interface chip from hogging
7363 * the adapter local bus, which can starve the 16C32 by preventing
7364 * 16C32 bus master cycles.
7365 *
7366 * The PCI9050 documentation says that the 9050 will always release
7367 * control of the local bus after completing the current read
7368 * or write operation.
7369 *
7370 * It appears that as long as the PCI9050 write FIFO is full, the
7371 * PCI9050 treats all of the writes as a single burst transaction
7372 * and will not release the bus. This causes DMA latency problems
7373 * at high speeds when copying large data blocks to the shared
7374 * memory.
7375 *
7376 * This function in effect, breaks the a large shared memory write
7377 * into multiple transations by interleaving a shared memory read
7378 * which will flush the write FIFO and 'complete' the write
7379 * transation. This allows any pending DMA request to gain control
7380 * of the local bus in a timely fasion.
7381 *
7382 * Arguments:
7383 *
7384 * TargetPtr pointer to target address in PCI shared memory
7385 * SourcePtr pointer to source buffer for data
7386 * count count in bytes of data to copy
7387 *
7388 * Return Value: None
7389 */
7390 static void mgsl_load_pci_memory( char* TargetPtr, const char* SourcePtr,
7391 unsigned short count )
7392 {
7393 /* 16 32-bit writes @ 60ns each = 960ns max latency on local bus */
7394 #define PCI_LOAD_INTERVAL 64
7395
7396 unsigned short Intervalcount = count / PCI_LOAD_INTERVAL;
7397 unsigned short Index;
7398 unsigned long Dummy;
7399
7400 for ( Index = 0 ; Index < Intervalcount ; Index++ )
7401 {
7402 memcpy(TargetPtr, SourcePtr, PCI_LOAD_INTERVAL);
7403 Dummy = *((volatile unsigned long *)TargetPtr);
7404 TargetPtr += PCI_LOAD_INTERVAL;
7405 SourcePtr += PCI_LOAD_INTERVAL;
7406 }
7407
7408 memcpy( TargetPtr, SourcePtr, count % PCI_LOAD_INTERVAL );
7409
7410 } /* End Of mgsl_load_pci_memory() */
7411
7412 static void mgsl_trace_block(struct mgsl_struct *info,const char* data, int count, int xmit)
7413 {
7414 int i;
7415 int linecount;
7416 if (xmit)
7417 printk("%s tx data:\n",info->device_name);
7418 else
7419 printk("%s rx data:\n",info->device_name);
7420
7421 while(count) {
7422 if (count > 16)
7423 linecount = 16;
7424 else
7425 linecount = count;
7426
7427 for(i=0;i<linecount;i++)
7428 printk("%02X ",(unsigned char)data[i]);
7429 for(;i<17;i++)
7430 printk(" ");
7431 for(i=0;i<linecount;i++) {
7432 if (data[i]>=040 && data[i]<=0176)
7433 printk("%c",data[i]);
7434 else
7435 printk(".");
7436 }
7437 printk("\n");
7438
7439 data += linecount;
7440 count -= linecount;
7441 }
7442 } /* end of mgsl_trace_block() */
7443
7444 /* mgsl_tx_timeout()
7445 *
7446 * called when HDLC frame times out
7447 * update stats and do tx completion processing
7448 *
7449 * Arguments: context pointer to device instance data
7450 * Return Value: None
7451 */
7452 static void mgsl_tx_timeout(struct timer_list *t)
7453 {
7454 struct mgsl_struct *info = from_timer(info, t, tx_timer);
7455 unsigned long flags;
7456
7457 if ( debug_level >= DEBUG_LEVEL_INFO )
7458 printk( "%s(%d):mgsl_tx_timeout(%s)\n",
7459 __FILE__,__LINE__,info->device_name);
7460 if(info->tx_active &&
7461 (info->params.mode == MGSL_MODE_HDLC ||
7462 info->params.mode == MGSL_MODE_RAW) ) {
7463 info->icount.txtimeout++;
7464 }
7465 spin_lock_irqsave(&info->irq_spinlock,flags);
7466 info->tx_active = false;
7467 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
7468
7469 if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
7470 usc_loopmode_cancel_transmit( info );
7471
7472 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7473
7474 #if SYNCLINK_GENERIC_HDLC
7475 if (info->netcount)
7476 hdlcdev_tx_done(info);
7477 else
7478 #endif
7479 mgsl_bh_transmit(info);
7480
7481 } /* end of mgsl_tx_timeout() */
7482
7483 /* signal that there are no more frames to send, so that
7484 * line is 'released' by echoing RxD to TxD when current
7485 * transmission is complete (or immediately if no tx in progress).
7486 */
7487 static int mgsl_loopmode_send_done( struct mgsl_struct * info )
7488 {
7489 unsigned long flags;
7490
7491 spin_lock_irqsave(&info->irq_spinlock,flags);
7492 if (info->params.flags & HDLC_FLAG_HDLC_LOOPMODE) {
7493 if (info->tx_active)
7494 info->loopmode_send_done_requested = true;
7495 else
7496 usc_loopmode_send_done(info);
7497 }
7498 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7499
7500 return 0;
7501 }
7502
7503 /* release the line by echoing RxD to TxD
7504 * upon completion of a transmit frame
7505 */
7506 static void usc_loopmode_send_done( struct mgsl_struct * info )
7507 {
7508 info->loopmode_send_done_requested = false;
7509 /* clear CMR:13 to 0 to start echoing RxData to TxData */
7510 info->cmr_value &= ~BIT13;
7511 usc_OutReg(info, CMR, info->cmr_value);
7512 }
7513
7514 /* abort a transmit in progress while in HDLC LoopMode
7515 */
7516 static void usc_loopmode_cancel_transmit( struct mgsl_struct * info )
7517 {
7518 /* reset tx dma channel and purge TxFifo */
7519 usc_RTCmd( info, RTCmd_PurgeTxFifo );
7520 usc_DmaCmd( info, DmaCmd_ResetTxChannel );
7521 usc_loopmode_send_done( info );
7522 }
7523
7524 /* for HDLC/SDLC LoopMode, setting CMR:13 after the transmitter is enabled
7525 * is an Insert Into Loop action. Upon receipt of a GoAhead sequence (RxAbort)
7526 * we must clear CMR:13 to begin repeating TxData to RxData
7527 */
7528 static void usc_loopmode_insert_request( struct mgsl_struct * info )
7529 {
7530 info->loopmode_insert_requested = true;
7531
7532 /* enable RxAbort irq. On next RxAbort, clear CMR:13 to
7533 * begin repeating TxData on RxData (complete insertion)
7534 */
7535 usc_OutReg( info, RICR,
7536 (usc_InReg( info, RICR ) | RXSTATUS_ABORT_RECEIVED ) );
7537
7538 /* set CMR:13 to insert into loop on next GoAhead (RxAbort) */
7539 info->cmr_value |= BIT13;
7540 usc_OutReg(info, CMR, info->cmr_value);
7541 }
7542
7543 /* return 1 if station is inserted into the loop, otherwise 0
7544 */
7545 static int usc_loopmode_active( struct mgsl_struct * info)
7546 {
7547 return usc_InReg( info, CCSR ) & BIT7 ? 1 : 0 ;
7548 }
7549
7550 #if SYNCLINK_GENERIC_HDLC
7551
7552 /**
7553 * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
7554 * set encoding and frame check sequence (FCS) options
7555 *
7556 * dev pointer to network device structure
7557 * encoding serial encoding setting
7558 * parity FCS setting
7559 *
7560 * returns 0 if success, otherwise error code
7561 */
7562 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
7563 unsigned short parity)
7564 {
7565 struct mgsl_struct *info = dev_to_port(dev);
7566 unsigned char new_encoding;
7567 unsigned short new_crctype;
7568
7569 /* return error if TTY interface open */
7570 if (info->port.count)
7571 return -EBUSY;
7572
7573 switch (encoding)
7574 {
7575 case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break;
7576 case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
7577 case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
7578 case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
7579 case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
7580 default: return -EINVAL;
7581 }
7582
7583 switch (parity)
7584 {
7585 case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break;
7586 case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
7587 case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
7588 default: return -EINVAL;
7589 }
7590
7591 info->params.encoding = new_encoding;
7592 info->params.crc_type = new_crctype;
7593
7594 /* if network interface up, reprogram hardware */
7595 if (info->netcount)
7596 mgsl_program_hw(info);
7597
7598 return 0;
7599 }
7600
7601 /**
7602 * called by generic HDLC layer to send frame
7603 *
7604 * skb socket buffer containing HDLC frame
7605 * dev pointer to network device structure
7606 */
7607 static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb,
7608 struct net_device *dev)
7609 {
7610 struct mgsl_struct *info = dev_to_port(dev);
7611 unsigned long flags;
7612
7613 if (debug_level >= DEBUG_LEVEL_INFO)
7614 printk(KERN_INFO "%s:hdlc_xmit(%s)\n",__FILE__,dev->name);
7615
7616 /* stop sending until this frame completes */
7617 netif_stop_queue(dev);
7618
7619 /* copy data to device buffers */
7620 info->xmit_cnt = skb->len;
7621 mgsl_load_tx_dma_buffer(info, skb->data, skb->len);
7622
7623 /* update network statistics */
7624 dev->stats.tx_packets++;
7625 dev->stats.tx_bytes += skb->len;
7626
7627 /* done with socket buffer, so free it */
7628 dev_kfree_skb(skb);
7629
7630 /* save start time for transmit timeout detection */
7631 netif_trans_update(dev);
7632
7633 /* start hardware transmitter if necessary */
7634 spin_lock_irqsave(&info->irq_spinlock,flags);
7635 if (!info->tx_active)
7636 usc_start_transmitter(info);
7637 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7638
7639 return NETDEV_TX_OK;
7640 }
7641
7642 /**
7643 * called by network layer when interface enabled
7644 * claim resources and initialize hardware
7645 *
7646 * dev pointer to network device structure
7647 *
7648 * returns 0 if success, otherwise error code
7649 */
7650 static int hdlcdev_open(struct net_device *dev)
7651 {
7652 struct mgsl_struct *info = dev_to_port(dev);
7653 int rc;
7654 unsigned long flags;
7655
7656 if (debug_level >= DEBUG_LEVEL_INFO)
7657 printk("%s:hdlcdev_open(%s)\n",__FILE__,dev->name);
7658
7659 /* generic HDLC layer open processing */
7660 rc = hdlc_open(dev);
7661 if (rc)
7662 return rc;
7663
7664 /* arbitrate between network and tty opens */
7665 spin_lock_irqsave(&info->netlock, flags);
7666 if (info->port.count != 0 || info->netcount != 0) {
7667 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
7668 spin_unlock_irqrestore(&info->netlock, flags);
7669 return -EBUSY;
7670 }
7671 info->netcount=1;
7672 spin_unlock_irqrestore(&info->netlock, flags);
7673
7674 /* claim resources and init adapter */
7675 if ((rc = startup(info)) != 0) {
7676 spin_lock_irqsave(&info->netlock, flags);
7677 info->netcount=0;
7678 spin_unlock_irqrestore(&info->netlock, flags);
7679 return rc;
7680 }
7681
7682 /* assert RTS and DTR, apply hardware settings */
7683 info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
7684 mgsl_program_hw(info);
7685
7686 /* enable network layer transmit */
7687 netif_trans_update(dev);
7688 netif_start_queue(dev);
7689
7690 /* inform generic HDLC layer of current DCD status */
7691 spin_lock_irqsave(&info->irq_spinlock, flags);
7692 usc_get_serial_signals(info);
7693 spin_unlock_irqrestore(&info->irq_spinlock, flags);
7694 if (info->serial_signals & SerialSignal_DCD)
7695 netif_carrier_on(dev);
7696 else
7697 netif_carrier_off(dev);
7698 return 0;
7699 }
7700
7701 /**
7702 * called by network layer when interface is disabled
7703 * shutdown hardware and release resources
7704 *
7705 * dev pointer to network device structure
7706 *
7707 * returns 0 if success, otherwise error code
7708 */
7709 static int hdlcdev_close(struct net_device *dev)
7710 {
7711 struct mgsl_struct *info = dev_to_port(dev);
7712 unsigned long flags;
7713
7714 if (debug_level >= DEBUG_LEVEL_INFO)
7715 printk("%s:hdlcdev_close(%s)\n",__FILE__,dev->name);
7716
7717 netif_stop_queue(dev);
7718
7719 /* shutdown adapter and release resources */
7720 shutdown(info);
7721
7722 hdlc_close(dev);
7723
7724 spin_lock_irqsave(&info->netlock, flags);
7725 info->netcount=0;
7726 spin_unlock_irqrestore(&info->netlock, flags);
7727
7728 return 0;
7729 }
7730
7731 /**
7732 * called by network layer to process IOCTL call to network device
7733 *
7734 * dev pointer to network device structure
7735 * ifr pointer to network interface request structure
7736 * cmd IOCTL command code
7737 *
7738 * returns 0 if success, otherwise error code
7739 */
7740 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
7741 {
7742 const size_t size = sizeof(sync_serial_settings);
7743 sync_serial_settings new_line;
7744 sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
7745 struct mgsl_struct *info = dev_to_port(dev);
7746 unsigned int flags;
7747
7748 if (debug_level >= DEBUG_LEVEL_INFO)
7749 printk("%s:hdlcdev_ioctl(%s)\n",__FILE__,dev->name);
7750
7751 /* return error if TTY interface open */
7752 if (info->port.count)
7753 return -EBUSY;
7754
7755 if (cmd != SIOCWANDEV)
7756 return hdlc_ioctl(dev, ifr, cmd);
7757
7758 switch(ifr->ifr_settings.type) {
7759 case IF_GET_IFACE: /* return current sync_serial_settings */
7760
7761 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
7762 if (ifr->ifr_settings.size < size) {
7763 ifr->ifr_settings.size = size; /* data size wanted */
7764 return -ENOBUFS;
7765 }
7766
7767 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
7768 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
7769 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
7770 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
7771
7772 memset(&new_line, 0, sizeof(new_line));
7773 switch (flags){
7774 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
7775 case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break;
7776 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break;
7777 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
7778 default: new_line.clock_type = CLOCK_DEFAULT;
7779 }
7780
7781 new_line.clock_rate = info->params.clock_speed;
7782 new_line.loopback = info->params.loopback ? 1:0;
7783
7784 if (copy_to_user(line, &new_line, size))
7785 return -EFAULT;
7786 return 0;
7787
7788 case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
7789
7790 if(!capable(CAP_NET_ADMIN))
7791 return -EPERM;
7792 if (copy_from_user(&new_line, line, size))
7793 return -EFAULT;
7794
7795 switch (new_line.clock_type)
7796 {
7797 case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
7798 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
7799 case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break;
7800 case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break;
7801 case CLOCK_DEFAULT: flags = info->params.flags &
7802 (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
7803 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
7804 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
7805 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); break;
7806 default: return -EINVAL;
7807 }
7808
7809 if (new_line.loopback != 0 && new_line.loopback != 1)
7810 return -EINVAL;
7811
7812 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
7813 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
7814 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
7815 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
7816 info->params.flags |= flags;
7817
7818 info->params.loopback = new_line.loopback;
7819
7820 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
7821 info->params.clock_speed = new_line.clock_rate;
7822 else
7823 info->params.clock_speed = 0;
7824
7825 /* if network interface up, reprogram hardware */
7826 if (info->netcount)
7827 mgsl_program_hw(info);
7828 return 0;
7829
7830 default:
7831 return hdlc_ioctl(dev, ifr, cmd);
7832 }
7833 }
7834
7835 /**
7836 * called by network layer when transmit timeout is detected
7837 *
7838 * dev pointer to network device structure
7839 */
7840 static void hdlcdev_tx_timeout(struct net_device *dev, unsigned int txqueue)
7841 {
7842 struct mgsl_struct *info = dev_to_port(dev);
7843 unsigned long flags;
7844
7845 if (debug_level >= DEBUG_LEVEL_INFO)
7846 printk("hdlcdev_tx_timeout(%s)\n",dev->name);
7847
7848 dev->stats.tx_errors++;
7849 dev->stats.tx_aborted_errors++;
7850
7851 spin_lock_irqsave(&info->irq_spinlock,flags);
7852 usc_stop_transmitter(info);
7853 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7854
7855 netif_wake_queue(dev);
7856 }
7857
7858 /**
7859 * called by device driver when transmit completes
7860 * reenable network layer transmit if stopped
7861 *
7862 * info pointer to device instance information
7863 */
7864 static void hdlcdev_tx_done(struct mgsl_struct *info)
7865 {
7866 if (netif_queue_stopped(info->netdev))
7867 netif_wake_queue(info->netdev);
7868 }
7869
7870 /**
7871 * called by device driver when frame received
7872 * pass frame to network layer
7873 *
7874 * info pointer to device instance information
7875 * buf pointer to buffer contianing frame data
7876 * size count of data bytes in buf
7877 */
7878 static void hdlcdev_rx(struct mgsl_struct *info, char *buf, int size)
7879 {
7880 struct sk_buff *skb = dev_alloc_skb(size);
7881 struct net_device *dev = info->netdev;
7882
7883 if (debug_level >= DEBUG_LEVEL_INFO)
7884 printk("hdlcdev_rx(%s)\n", dev->name);
7885
7886 if (skb == NULL) {
7887 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n",
7888 dev->name);
7889 dev->stats.rx_dropped++;
7890 return;
7891 }
7892
7893 skb_put_data(skb, buf, size);
7894
7895 skb->protocol = hdlc_type_trans(skb, dev);
7896
7897 dev->stats.rx_packets++;
7898 dev->stats.rx_bytes += size;
7899
7900 netif_rx(skb);
7901 }
7902
7903 static const struct net_device_ops hdlcdev_ops = {
7904 .ndo_open = hdlcdev_open,
7905 .ndo_stop = hdlcdev_close,
7906 .ndo_start_xmit = hdlc_start_xmit,
7907 .ndo_do_ioctl = hdlcdev_ioctl,
7908 .ndo_tx_timeout = hdlcdev_tx_timeout,
7909 };
7910
7911 /**
7912 * called by device driver when adding device instance
7913 * do generic HDLC initialization
7914 *
7915 * info pointer to device instance information
7916 *
7917 * returns 0 if success, otherwise error code
7918 */
7919 static int hdlcdev_init(struct mgsl_struct *info)
7920 {
7921 int rc;
7922 struct net_device *dev;
7923 hdlc_device *hdlc;
7924
7925 /* allocate and initialize network and HDLC layer objects */
7926
7927 dev = alloc_hdlcdev(info);
7928 if (!dev) {
7929 printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
7930 return -ENOMEM;
7931 }
7932
7933 /* for network layer reporting purposes only */
7934 dev->base_addr = info->io_base;
7935 dev->irq = info->irq_level;
7936 dev->dma = info->dma_level;
7937
7938 /* network layer callbacks and settings */
7939 dev->netdev_ops = &hdlcdev_ops;
7940 dev->watchdog_timeo = 10 * HZ;
7941 dev->tx_queue_len = 50;
7942
7943 /* generic HDLC layer callbacks and settings */
7944 hdlc = dev_to_hdlc(dev);
7945 hdlc->attach = hdlcdev_attach;
7946 hdlc->xmit = hdlcdev_xmit;
7947
7948 /* register objects with HDLC layer */
7949 rc = register_hdlc_device(dev);
7950 if (rc) {
7951 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
7952 free_netdev(dev);
7953 return rc;
7954 }
7955
7956 info->netdev = dev;
7957 return 0;
7958 }
7959
7960 /**
7961 * called by device driver when removing device instance
7962 * do generic HDLC cleanup
7963 *
7964 * info pointer to device instance information
7965 */
7966 static void hdlcdev_exit(struct mgsl_struct *info)
7967 {
7968 unregister_hdlc_device(info->netdev);
7969 free_netdev(info->netdev);
7970 info->netdev = NULL;
7971 }
7972
7973 #endif /* CONFIG_HDLC */
7974
7975
7976 static int synclink_init_one (struct pci_dev *dev,
7977 const struct pci_device_id *ent)
7978 {
7979 struct mgsl_struct *info;
7980
7981 if (pci_enable_device(dev)) {
7982 printk("error enabling pci device %p\n", dev);
7983 return -EIO;
7984 }
7985
7986 info = mgsl_allocate_device();
7987 if (!info) {
7988 printk("can't allocate device instance data.\n");
7989 return -EIO;
7990 }
7991
7992 /* Copy user configuration info to device instance data */
7993
7994 info->io_base = pci_resource_start(dev, 2);
7995 info->irq_level = dev->irq;
7996 info->phys_memory_base = pci_resource_start(dev, 3);
7997
7998 /* Because veremap only works on page boundaries we must map
7999 * a larger area than is actually implemented for the LCR
8000 * memory range. We map a full page starting at the page boundary.
8001 */
8002 info->phys_lcr_base = pci_resource_start(dev, 0);
8003 info->lcr_offset = info->phys_lcr_base & (PAGE_SIZE-1);
8004 info->phys_lcr_base &= ~(PAGE_SIZE-1);
8005
8006 info->bus_type = MGSL_BUS_TYPE_PCI;
8007 info->io_addr_size = 8;
8008 info->irq_flags = IRQF_SHARED;
8009
8010 if (dev->device == 0x0210) {
8011 /* Version 1 PCI9030 based universal PCI adapter */
8012 info->misc_ctrl_value = 0x007c4080;
8013 info->hw_version = 1;
8014 } else {
8015 /* Version 0 PCI9050 based 5V PCI adapter
8016 * A PCI9050 bug prevents reading LCR registers if
8017 * LCR base address bit 7 is set. Maintain shadow
8018 * value so we can write to LCR misc control reg.
8019 */
8020 info->misc_ctrl_value = 0x087e4546;
8021 info->hw_version = 0;
8022 }
8023
8024 mgsl_add_device(info);
8025
8026 return 0;
8027 }
8028
8029 static void synclink_remove_one (struct pci_dev *dev)
8030 {
8031 }
8032
Linux with added FPC-III support