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Linux 3.11-rc3
[cris-mirror.git] / drivers / tty / synclinkmp.c
blobdc6e96996ead4796eace1ba3bb4b61232f132302
1 /*
2 * $Id: synclinkmp.c,v 4.38 2005/07/15 13:29:44 paulkf Exp $
3 *
4 * Device driver for Microgate SyncLink Multiport
5 * high speed multiprotocol serial adapter.
6 *
7 * written by Paul Fulghum for Microgate Corporation
8 * paulkf@microgate.com
9 *
10 * Microgate and SyncLink are trademarks of Microgate Corporation
11 *
12 * Derived from serial.c written by Theodore Ts'o and Linus Torvalds
13 * This code is released under the GNU General Public License (GPL)
14 *
15 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
16 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
19 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
20 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
23 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
25 * OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #define VERSION(ver,rel,seq) (((ver)<<16) | ((rel)<<8) | (seq))
29 #if defined(__i386__)
30 # define BREAKPOINT() asm(" int $3");
31 #else
32 # define BREAKPOINT() { }
33 #endif
34
35 #define MAX_DEVICES 12
36
37 #include <linux/module.h>
38 #include <linux/errno.h>
39 #include <linux/signal.h>
40 #include <linux/sched.h>
41 #include <linux/timer.h>
42 #include <linux/interrupt.h>
43 #include <linux/pci.h>
44 #include <linux/tty.h>
45 #include <linux/tty_flip.h>
46 #include <linux/serial.h>
47 #include <linux/major.h>
48 #include <linux/string.h>
49 #include <linux/fcntl.h>
50 #include <linux/ptrace.h>
51 #include <linux/ioport.h>
52 #include <linux/mm.h>
53 #include <linux/seq_file.h>
54 #include <linux/slab.h>
55 #include <linux/netdevice.h>
56 #include <linux/vmalloc.h>
57 #include <linux/init.h>
58 #include <linux/delay.h>
59 #include <linux/ioctl.h>
60
61 #include <asm/io.h>
62 #include <asm/irq.h>
63 #include <asm/dma.h>
64 #include <linux/bitops.h>
65 #include <asm/types.h>
66 #include <linux/termios.h>
67 #include <linux/workqueue.h>
68 #include <linux/hdlc.h>
69 #include <linux/synclink.h>
70
71 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINKMP_MODULE))
72 #define SYNCLINK_GENERIC_HDLC 1
73 #else
74 #define SYNCLINK_GENERIC_HDLC 0
75 #endif
76
77 #define GET_USER(error,value,addr) error = get_user(value,addr)
78 #define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
79 #define PUT_USER(error,value,addr) error = put_user(value,addr)
80 #define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
81
82 #include <asm/uaccess.h>
83
84 static MGSL_PARAMS default_params = {
85 MGSL_MODE_HDLC, /* unsigned long mode */
86 0, /* unsigned char loopback; */
87 HDLC_FLAG_UNDERRUN_ABORT15, /* unsigned short flags; */
88 HDLC_ENCODING_NRZI_SPACE, /* unsigned char encoding; */
89 0, /* unsigned long clock_speed; */
90 0xff, /* unsigned char addr_filter; */
91 HDLC_CRC_16_CCITT, /* unsigned short crc_type; */
92 HDLC_PREAMBLE_LENGTH_8BITS, /* unsigned char preamble_length; */
93 HDLC_PREAMBLE_PATTERN_NONE, /* unsigned char preamble; */
94 9600, /* unsigned long data_rate; */
95 8, /* unsigned char data_bits; */
96 1, /* unsigned char stop_bits; */
97 ASYNC_PARITY_NONE /* unsigned char parity; */
98 };
99
100 /* size in bytes of DMA data buffers */
101 #define SCABUFSIZE 1024
102 #define SCA_MEM_SIZE 0x40000
103 #define SCA_BASE_SIZE 512
104 #define SCA_REG_SIZE 16
105 #define SCA_MAX_PORTS 4
106 #define SCAMAXDESC 128
107
108 #define BUFFERLISTSIZE 4096
109
110 /* SCA-I style DMA buffer descriptor */
111 typedef struct _SCADESC
112 {
113 u16 next; /* lower l6 bits of next descriptor addr */
114 u16 buf_ptr; /* lower 16 bits of buffer addr */
115 u8 buf_base; /* upper 8 bits of buffer addr */
116 u8 pad1;
117 u16 length; /* length of buffer */
118 u8 status; /* status of buffer */
119 u8 pad2;
120 } SCADESC, *PSCADESC;
121
122 typedef struct _SCADESC_EX
123 {
124 /* device driver bookkeeping section */
125 char *virt_addr; /* virtual address of data buffer */
126 u16 phys_entry; /* lower 16-bits of physical address of this descriptor */
127 } SCADESC_EX, *PSCADESC_EX;
128
129 /* The queue of BH actions to be performed */
130
131 #define BH_RECEIVE 1
132 #define BH_TRANSMIT 2
133 #define BH_STATUS 4
134
135 #define IO_PIN_SHUTDOWN_LIMIT 100
136
137 struct _input_signal_events {
138 int ri_up;
139 int ri_down;
140 int dsr_up;
141 int dsr_down;
142 int dcd_up;
143 int dcd_down;
144 int cts_up;
145 int cts_down;
146 };
147
148 /*
149 * Device instance data structure
150 */
151 typedef struct _synclinkmp_info {
152 void *if_ptr; /* General purpose pointer (used by SPPP) */
153 int magic;
154 struct tty_port port;
155 int line;
156 unsigned short close_delay;
157 unsigned short closing_wait; /* time to wait before closing */
158
159 struct mgsl_icount icount;
160
161 int timeout;
162 int x_char; /* xon/xoff character */
163 u16 read_status_mask1; /* break detection (SR1 indications) */
164 u16 read_status_mask2; /* parity/framing/overun (SR2 indications) */
165 unsigned char ignore_status_mask1; /* break detection (SR1 indications) */
166 unsigned char ignore_status_mask2; /* parity/framing/overun (SR2 indications) */
167 unsigned char *tx_buf;
168 int tx_put;
169 int tx_get;
170 int tx_count;
171
172 wait_queue_head_t status_event_wait_q;
173 wait_queue_head_t event_wait_q;
174 struct timer_list tx_timer; /* HDLC transmit timeout timer */
175 struct _synclinkmp_info *next_device; /* device list link */
176 struct timer_list status_timer; /* input signal status check timer */
177
178 spinlock_t lock; /* spinlock for synchronizing with ISR */
179 struct work_struct task; /* task structure for scheduling bh */
180
181 u32 max_frame_size; /* as set by device config */
182
183 u32 pending_bh;
184
185 bool bh_running; /* Protection from multiple */
186 int isr_overflow;
187 bool bh_requested;
188
189 int dcd_chkcount; /* check counts to prevent */
190 int cts_chkcount; /* too many IRQs if a signal */
191 int dsr_chkcount; /* is floating */
192 int ri_chkcount;
193
194 char *buffer_list; /* virtual address of Rx & Tx buffer lists */
195 unsigned long buffer_list_phys;
196
197 unsigned int rx_buf_count; /* count of total allocated Rx buffers */
198 SCADESC *rx_buf_list; /* list of receive buffer entries */
199 SCADESC_EX rx_buf_list_ex[SCAMAXDESC]; /* list of receive buffer entries */
200 unsigned int current_rx_buf;
201
202 unsigned int tx_buf_count; /* count of total allocated Tx buffers */
203 SCADESC *tx_buf_list; /* list of transmit buffer entries */
204 SCADESC_EX tx_buf_list_ex[SCAMAXDESC]; /* list of transmit buffer entries */
205 unsigned int last_tx_buf;
206
207 unsigned char *tmp_rx_buf;
208 unsigned int tmp_rx_buf_count;
209
210 bool rx_enabled;
211 bool rx_overflow;
212
213 bool tx_enabled;
214 bool tx_active;
215 u32 idle_mode;
216
217 unsigned char ie0_value;
218 unsigned char ie1_value;
219 unsigned char ie2_value;
220 unsigned char ctrlreg_value;
221 unsigned char old_signals;
222
223 char device_name[25]; /* device instance name */
224
225 int port_count;
226 int adapter_num;
227 int port_num;
228
229 struct _synclinkmp_info *port_array[SCA_MAX_PORTS];
230
231 unsigned int bus_type; /* expansion bus type (ISA,EISA,PCI) */
232
233 unsigned int irq_level; /* interrupt level */
234 unsigned long irq_flags;
235 bool irq_requested; /* true if IRQ requested */
236
237 MGSL_PARAMS params; /* communications parameters */
238
239 unsigned char serial_signals; /* current serial signal states */
240
241 bool irq_occurred; /* for diagnostics use */
242 unsigned int init_error; /* Initialization startup error */
243
244 u32 last_mem_alloc;
245 unsigned char* memory_base; /* shared memory address (PCI only) */
246 u32 phys_memory_base;
247 int shared_mem_requested;
248
249 unsigned char* sca_base; /* HD64570 SCA Memory address */
250 u32 phys_sca_base;
251 u32 sca_offset;
252 bool sca_base_requested;
253
254 unsigned char* lcr_base; /* local config registers (PCI only) */
255 u32 phys_lcr_base;
256 u32 lcr_offset;
257 int lcr_mem_requested;
258
259 unsigned char* statctrl_base; /* status/control register memory */
260 u32 phys_statctrl_base;
261 u32 statctrl_offset;
262 bool sca_statctrl_requested;
263
264 u32 misc_ctrl_value;
265 char *flag_buf;
266 bool drop_rts_on_tx_done;
267
268 struct _input_signal_events input_signal_events;
269
270 /* SPPP/Cisco HDLC device parts */
271 int netcount;
272 spinlock_t netlock;
273
274 #if SYNCLINK_GENERIC_HDLC
275 struct net_device *netdev;
276 #endif
277
278 } SLMP_INFO;
279
280 #define MGSL_MAGIC 0x5401
281
282 /*
283 * define serial signal status change macros
284 */
285 #define MISCSTATUS_DCD_LATCHED (SerialSignal_DCD<<8) /* indicates change in DCD */
286 #define MISCSTATUS_RI_LATCHED (SerialSignal_RI<<8) /* indicates change in RI */
287 #define MISCSTATUS_CTS_LATCHED (SerialSignal_CTS<<8) /* indicates change in CTS */
288 #define MISCSTATUS_DSR_LATCHED (SerialSignal_DSR<<8) /* change in DSR */
289
290 /* Common Register macros */
291 #define LPR 0x00
292 #define PABR0 0x02
293 #define PABR1 0x03
294 #define WCRL 0x04
295 #define WCRM 0x05
296 #define WCRH 0x06
297 #define DPCR 0x08
298 #define DMER 0x09
299 #define ISR0 0x10
300 #define ISR1 0x11
301 #define ISR2 0x12
302 #define IER0 0x14
303 #define IER1 0x15
304 #define IER2 0x16
305 #define ITCR 0x18
306 #define INTVR 0x1a
307 #define IMVR 0x1c
308
309 /* MSCI Register macros */
310 #define TRB 0x20
311 #define TRBL 0x20
312 #define TRBH 0x21
313 #define SR0 0x22
314 #define SR1 0x23
315 #define SR2 0x24
316 #define SR3 0x25
317 #define FST 0x26
318 #define IE0 0x28
319 #define IE1 0x29
320 #define IE2 0x2a
321 #define FIE 0x2b
322 #define CMD 0x2c
323 #define MD0 0x2e
324 #define MD1 0x2f
325 #define MD2 0x30
326 #define CTL 0x31
327 #define SA0 0x32
328 #define SA1 0x33
329 #define IDL 0x34
330 #define TMC 0x35
331 #define RXS 0x36
332 #define TXS 0x37
333 #define TRC0 0x38
334 #define TRC1 0x39
335 #define RRC 0x3a
336 #define CST0 0x3c
337 #define CST1 0x3d
338
339 /* Timer Register Macros */
340 #define TCNT 0x60
341 #define TCNTL 0x60
342 #define TCNTH 0x61
343 #define TCONR 0x62
344 #define TCONRL 0x62
345 #define TCONRH 0x63
346 #define TMCS 0x64
347 #define TEPR 0x65
348
349 /* DMA Controller Register macros */
350 #define DARL 0x80
351 #define DARH 0x81
352 #define DARB 0x82
353 #define BAR 0x80
354 #define BARL 0x80
355 #define BARH 0x81
356 #define BARB 0x82
357 #define SAR 0x84
358 #define SARL 0x84
359 #define SARH 0x85
360 #define SARB 0x86
361 #define CPB 0x86
362 #define CDA 0x88
363 #define CDAL 0x88
364 #define CDAH 0x89
365 #define EDA 0x8a
366 #define EDAL 0x8a
367 #define EDAH 0x8b
368 #define BFL 0x8c
369 #define BFLL 0x8c
370 #define BFLH 0x8d
371 #define BCR 0x8e
372 #define BCRL 0x8e
373 #define BCRH 0x8f
374 #define DSR 0x90
375 #define DMR 0x91
376 #define FCT 0x93
377 #define DIR 0x94
378 #define DCMD 0x95
379
380 /* combine with timer or DMA register address */
381 #define TIMER0 0x00
382 #define TIMER1 0x08
383 #define TIMER2 0x10
384 #define TIMER3 0x18
385 #define RXDMA 0x00
386 #define TXDMA 0x20
387
388 /* SCA Command Codes */
389 #define NOOP 0x00
390 #define TXRESET 0x01
391 #define TXENABLE 0x02
392 #define TXDISABLE 0x03
393 #define TXCRCINIT 0x04
394 #define TXCRCEXCL 0x05
395 #define TXEOM 0x06
396 #define TXABORT 0x07
397 #define MPON 0x08
398 #define TXBUFCLR 0x09
399 #define RXRESET 0x11
400 #define RXENABLE 0x12
401 #define RXDISABLE 0x13
402 #define RXCRCINIT 0x14
403 #define RXREJECT 0x15
404 #define SEARCHMP 0x16
405 #define RXCRCEXCL 0x17
406 #define RXCRCCALC 0x18
407 #define CHRESET 0x21
408 #define HUNT 0x31
409
410 /* DMA command codes */
411 #define SWABORT 0x01
412 #define FEICLEAR 0x02
413
414 /* IE0 */
415 #define TXINTE BIT7
416 #define RXINTE BIT6
417 #define TXRDYE BIT1
418 #define RXRDYE BIT0
419
420 /* IE1 & SR1 */
421 #define UDRN BIT7
422 #define IDLE BIT6
423 #define SYNCD BIT4
424 #define FLGD BIT4
425 #define CCTS BIT3
426 #define CDCD BIT2
427 #define BRKD BIT1
428 #define ABTD BIT1
429 #define GAPD BIT1
430 #define BRKE BIT0
431 #define IDLD BIT0
432
433 /* IE2 & SR2 */
434 #define EOM BIT7
435 #define PMP BIT6
436 #define SHRT BIT6
437 #define PE BIT5
438 #define ABT BIT5
439 #define FRME BIT4
440 #define RBIT BIT4
441 #define OVRN BIT3
442 #define CRCE BIT2
443
444
445 /*
446 * Global linked list of SyncLink devices
447 */
448 static SLMP_INFO *synclinkmp_device_list = NULL;
449 static int synclinkmp_adapter_count = -1;
450 static int synclinkmp_device_count = 0;
451
452 /*
453 * Set this param to non-zero to load eax with the
454 * .text section address and breakpoint on module load.
455 * This is useful for use with gdb and add-symbol-file command.
456 */
457 static bool break_on_load = 0;
458
459 /*
460 * Driver major number, defaults to zero to get auto
461 * assigned major number. May be forced as module parameter.
462 */
463 static int ttymajor = 0;
464
465 /*
466 * Array of user specified options for ISA adapters.
467 */
468 static int debug_level = 0;
469 static int maxframe[MAX_DEVICES] = {0,};
470
471 module_param(break_on_load, bool, 0);
472 module_param(ttymajor, int, 0);
473 module_param(debug_level, int, 0);
474 module_param_array(maxframe, int, NULL, 0);
475
476 static char *driver_name = "SyncLink MultiPort driver";
477 static char *driver_version = "$Revision: 4.38 $";
478
479 static int synclinkmp_init_one(struct pci_dev *dev,const struct pci_device_id *ent);
480 static void synclinkmp_remove_one(struct pci_dev *dev);
481
482 static struct pci_device_id synclinkmp_pci_tbl[] = {
483 { PCI_VENDOR_ID_MICROGATE, PCI_DEVICE_ID_MICROGATE_SCA, PCI_ANY_ID, PCI_ANY_ID, },
484 { 0, }, /* terminate list */
485 };
486 MODULE_DEVICE_TABLE(pci, synclinkmp_pci_tbl);
487
488 MODULE_LICENSE("GPL");
489
490 static struct pci_driver synclinkmp_pci_driver = {
491 .name = "synclinkmp",
492 .id_table = synclinkmp_pci_tbl,
493 .probe = synclinkmp_init_one,
494 .remove = synclinkmp_remove_one,
495 };
496
497
498 static struct tty_driver *serial_driver;
499
500 /* number of characters left in xmit buffer before we ask for more */
501 #define WAKEUP_CHARS 256
502
503
504 /* tty callbacks */
505
506 static int open(struct tty_struct *tty, struct file * filp);
507 static void close(struct tty_struct *tty, struct file * filp);
508 static void hangup(struct tty_struct *tty);
509 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios);
510
511 static int write(struct tty_struct *tty, const unsigned char *buf, int count);
512 static int put_char(struct tty_struct *tty, unsigned char ch);
513 static void send_xchar(struct tty_struct *tty, char ch);
514 static void wait_until_sent(struct tty_struct *tty, int timeout);
515 static int write_room(struct tty_struct *tty);
516 static void flush_chars(struct tty_struct *tty);
517 static void flush_buffer(struct tty_struct *tty);
518 static void tx_hold(struct tty_struct *tty);
519 static void tx_release(struct tty_struct *tty);
520
521 static int ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg);
522 static int chars_in_buffer(struct tty_struct *tty);
523 static void throttle(struct tty_struct * tty);
524 static void unthrottle(struct tty_struct * tty);
525 static int set_break(struct tty_struct *tty, int break_state);
526
527 #if SYNCLINK_GENERIC_HDLC
528 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
529 static void hdlcdev_tx_done(SLMP_INFO *info);
530 static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size);
531 static int hdlcdev_init(SLMP_INFO *info);
532 static void hdlcdev_exit(SLMP_INFO *info);
533 #endif
534
535 /* ioctl handlers */
536
537 static int get_stats(SLMP_INFO *info, struct mgsl_icount __user *user_icount);
538 static int get_params(SLMP_INFO *info, MGSL_PARAMS __user *params);
539 static int set_params(SLMP_INFO *info, MGSL_PARAMS __user *params);
540 static int get_txidle(SLMP_INFO *info, int __user *idle_mode);
541 static int set_txidle(SLMP_INFO *info, int idle_mode);
542 static int tx_enable(SLMP_INFO *info, int enable);
543 static int tx_abort(SLMP_INFO *info);
544 static int rx_enable(SLMP_INFO *info, int enable);
545 static int modem_input_wait(SLMP_INFO *info,int arg);
546 static int wait_mgsl_event(SLMP_INFO *info, int __user *mask_ptr);
547 static int tiocmget(struct tty_struct *tty);
548 static int tiocmset(struct tty_struct *tty,
549 unsigned int set, unsigned int clear);
550 static int set_break(struct tty_struct *tty, int break_state);
551
552 static void add_device(SLMP_INFO *info);
553 static void device_init(int adapter_num, struct pci_dev *pdev);
554 static int claim_resources(SLMP_INFO *info);
555 static void release_resources(SLMP_INFO *info);
556
557 static int startup(SLMP_INFO *info);
558 static int block_til_ready(struct tty_struct *tty, struct file * filp,SLMP_INFO *info);
559 static int carrier_raised(struct tty_port *port);
560 static void shutdown(SLMP_INFO *info);
561 static void program_hw(SLMP_INFO *info);
562 static void change_params(SLMP_INFO *info);
563
564 static bool init_adapter(SLMP_INFO *info);
565 static bool register_test(SLMP_INFO *info);
566 static bool irq_test(SLMP_INFO *info);
567 static bool loopback_test(SLMP_INFO *info);
568 static int adapter_test(SLMP_INFO *info);
569 static bool memory_test(SLMP_INFO *info);
570
571 static void reset_adapter(SLMP_INFO *info);
572 static void reset_port(SLMP_INFO *info);
573 static void async_mode(SLMP_INFO *info);
574 static void hdlc_mode(SLMP_INFO *info);
575
576 static void rx_stop(SLMP_INFO *info);
577 static void rx_start(SLMP_INFO *info);
578 static void rx_reset_buffers(SLMP_INFO *info);
579 static void rx_free_frame_buffers(SLMP_INFO *info, unsigned int first, unsigned int last);
580 static bool rx_get_frame(SLMP_INFO *info);
581
582 static void tx_start(SLMP_INFO *info);
583 static void tx_stop(SLMP_INFO *info);
584 static void tx_load_fifo(SLMP_INFO *info);
585 static void tx_set_idle(SLMP_INFO *info);
586 static void tx_load_dma_buffer(SLMP_INFO *info, const char *buf, unsigned int count);
587
588 static void get_signals(SLMP_INFO *info);
589 static void set_signals(SLMP_INFO *info);
590 static void enable_loopback(SLMP_INFO *info, int enable);
591 static void set_rate(SLMP_INFO *info, u32 data_rate);
592
593 static int bh_action(SLMP_INFO *info);
594 static void bh_handler(struct work_struct *work);
595 static void bh_receive(SLMP_INFO *info);
596 static void bh_transmit(SLMP_INFO *info);
597 static void bh_status(SLMP_INFO *info);
598 static void isr_timer(SLMP_INFO *info);
599 static void isr_rxint(SLMP_INFO *info);
600 static void isr_rxrdy(SLMP_INFO *info);
601 static void isr_txint(SLMP_INFO *info);
602 static void isr_txrdy(SLMP_INFO *info);
603 static void isr_rxdmaok(SLMP_INFO *info);
604 static void isr_rxdmaerror(SLMP_INFO *info);
605 static void isr_txdmaok(SLMP_INFO *info);
606 static void isr_txdmaerror(SLMP_INFO *info);
607 static void isr_io_pin(SLMP_INFO *info, u16 status);
608
609 static int alloc_dma_bufs(SLMP_INFO *info);
610 static void free_dma_bufs(SLMP_INFO *info);
611 static int alloc_buf_list(SLMP_INFO *info);
612 static int alloc_frame_bufs(SLMP_INFO *info, SCADESC *list, SCADESC_EX *list_ex,int count);
613 static int alloc_tmp_rx_buf(SLMP_INFO *info);
614 static void free_tmp_rx_buf(SLMP_INFO *info);
615
616 static void load_pci_memory(SLMP_INFO *info, char* dest, const char* src, unsigned short count);
617 static void trace_block(SLMP_INFO *info, const char* data, int count, int xmit);
618 static void tx_timeout(unsigned long context);
619 static void status_timeout(unsigned long context);
620
621 static unsigned char read_reg(SLMP_INFO *info, unsigned char addr);
622 static void write_reg(SLMP_INFO *info, unsigned char addr, unsigned char val);
623 static u16 read_reg16(SLMP_INFO *info, unsigned char addr);
624 static void write_reg16(SLMP_INFO *info, unsigned char addr, u16 val);
625 static unsigned char read_status_reg(SLMP_INFO * info);
626 static void write_control_reg(SLMP_INFO * info);
627
628
629 static unsigned char rx_active_fifo_level = 16; // rx request FIFO activation level in bytes
630 static unsigned char tx_active_fifo_level = 16; // tx request FIFO activation level in bytes
631 static unsigned char tx_negate_fifo_level = 32; // tx request FIFO negation level in bytes
632
633 static u32 misc_ctrl_value = 0x007e4040;
634 static u32 lcr1_brdr_value = 0x00800028;
635
636 static u32 read_ahead_count = 8;
637
638 /* DPCR, DMA Priority Control
639 *
640 * 07..05 Not used, must be 0
641 * 04 BRC, bus release condition: 0=all transfers complete
642 * 1=release after 1 xfer on all channels
643 * 03 CCC, channel change condition: 0=every cycle
644 * 1=after each channel completes all xfers
645 * 02..00 PR<2..0>, priority 100=round robin
646 *
647 * 00000100 = 0x00
648 */
649 static unsigned char dma_priority = 0x04;
650
651 // Number of bytes that can be written to shared RAM
652 // in a single write operation
653 static u32 sca_pci_load_interval = 64;
654
655 /*
656 * 1st function defined in .text section. Calling this function in
657 * init_module() followed by a breakpoint allows a remote debugger
658 * (gdb) to get the .text address for the add-symbol-file command.
659 * This allows remote debugging of dynamically loadable modules.
660 */
661 static void* synclinkmp_get_text_ptr(void);
662 static void* synclinkmp_get_text_ptr(void) {return synclinkmp_get_text_ptr;}
663
664 static inline int sanity_check(SLMP_INFO *info,
665 char *name, const char *routine)
666 {
667 #ifdef SANITY_CHECK
668 static const char *badmagic =
669 "Warning: bad magic number for synclinkmp_struct (%s) in %s\n";
670 static const char *badinfo =
671 "Warning: null synclinkmp_struct for (%s) in %s\n";
672
673 if (!info) {
674 printk(badinfo, name, routine);
675 return 1;
676 }
677 if (info->magic != MGSL_MAGIC) {
678 printk(badmagic, name, routine);
679 return 1;
680 }
681 #else
682 if (!info)
683 return 1;
684 #endif
685 return 0;
686 }
687
688 /**
689 * line discipline callback wrappers
690 *
691 * The wrappers maintain line discipline references
692 * while calling into the line discipline.
693 *
694 * ldisc_receive_buf - pass receive data to line discipline
695 */
696
697 static void ldisc_receive_buf(struct tty_struct *tty,
698 const __u8 *data, char *flags, int count)
699 {
700 struct tty_ldisc *ld;
701 if (!tty)
702 return;
703 ld = tty_ldisc_ref(tty);
704 if (ld) {
705 if (ld->ops->receive_buf)
706 ld->ops->receive_buf(tty, data, flags, count);
707 tty_ldisc_deref(ld);
708 }
709 }
710
711 /* tty callbacks */
712
713 static int install(struct tty_driver *driver, struct tty_struct *tty)
714 {
715 SLMP_INFO *info;
716 int line = tty->index;
717
718 if (line >= synclinkmp_device_count) {
719 printk("%s(%d): open with invalid line #%d.\n",
720 __FILE__,__LINE__,line);
721 return -ENODEV;
722 }
723
724 info = synclinkmp_device_list;
725 while (info && info->line != line)
726 info = info->next_device;
727 if (sanity_check(info, tty->name, "open"))
728 return -ENODEV;
729 if (info->init_error) {
730 printk("%s(%d):%s device is not allocated, init error=%d\n",
731 __FILE__, __LINE__, info->device_name,
732 info->init_error);
733 return -ENODEV;
734 }
735
736 tty->driver_data = info;
737
738 return tty_port_install(&info->port, driver, tty);
739 }
740
741 /* Called when a port is opened. Init and enable port.
742 */
743 static int open(struct tty_struct *tty, struct file *filp)
744 {
745 SLMP_INFO *info = tty->driver_data;
746 unsigned long flags;
747 int retval;
748
749 info->port.tty = tty;
750
751 if (debug_level >= DEBUG_LEVEL_INFO)
752 printk("%s(%d):%s open(), old ref count = %d\n",
753 __FILE__,__LINE__,tty->driver->name, info->port.count);
754
755 /* If port is closing, signal caller to try again */
756 if (tty_hung_up_p(filp) || info->port.flags & ASYNC_CLOSING){
757 if (info->port.flags & ASYNC_CLOSING)
758 interruptible_sleep_on(&info->port.close_wait);
759 retval = ((info->port.flags & ASYNC_HUP_NOTIFY) ?
760 -EAGAIN : -ERESTARTSYS);
761 goto cleanup;
762 }
763
764 info->port.low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
765
766 spin_lock_irqsave(&info->netlock, flags);
767 if (info->netcount) {
768 retval = -EBUSY;
769 spin_unlock_irqrestore(&info->netlock, flags);
770 goto cleanup;
771 }
772 info->port.count++;
773 spin_unlock_irqrestore(&info->netlock, flags);
774
775 if (info->port.count == 1) {
776 /* 1st open on this device, init hardware */
777 retval = startup(info);
778 if (retval < 0)
779 goto cleanup;
780 }
781
782 retval = block_til_ready(tty, filp, info);
783 if (retval) {
784 if (debug_level >= DEBUG_LEVEL_INFO)
785 printk("%s(%d):%s block_til_ready() returned %d\n",
786 __FILE__,__LINE__, info->device_name, retval);
787 goto cleanup;
788 }
789
790 if (debug_level >= DEBUG_LEVEL_INFO)
791 printk("%s(%d):%s open() success\n",
792 __FILE__,__LINE__, info->device_name);
793 retval = 0;
794
795 cleanup:
796 if (retval) {
797 if (tty->count == 1)
798 info->port.tty = NULL; /* tty layer will release tty struct */
799 if(info->port.count)
800 info->port.count--;
801 }
802
803 return retval;
804 }
805
806 /* Called when port is closed. Wait for remaining data to be
807 * sent. Disable port and free resources.
808 */
809 static void close(struct tty_struct *tty, struct file *filp)
810 {
811 SLMP_INFO * info = tty->driver_data;
812
813 if (sanity_check(info, tty->name, "close"))
814 return;
815
816 if (debug_level >= DEBUG_LEVEL_INFO)
817 printk("%s(%d):%s close() entry, count=%d\n",
818 __FILE__,__LINE__, info->device_name, info->port.count);
819
820 if (tty_port_close_start(&info->port, tty, filp) == 0)
821 goto cleanup;
822
823 mutex_lock(&info->port.mutex);
824 if (info->port.flags & ASYNC_INITIALIZED)
825 wait_until_sent(tty, info->timeout);
826
827 flush_buffer(tty);
828 tty_ldisc_flush(tty);
829 shutdown(info);
830 mutex_unlock(&info->port.mutex);
831
832 tty_port_close_end(&info->port, tty);
833 info->port.tty = NULL;
834 cleanup:
835 if (debug_level >= DEBUG_LEVEL_INFO)
836 printk("%s(%d):%s close() exit, count=%d\n", __FILE__,__LINE__,
837 tty->driver->name, info->port.count);
838 }
839
840 /* Called by tty_hangup() when a hangup is signaled.
841 * This is the same as closing all open descriptors for the port.
842 */
843 static void hangup(struct tty_struct *tty)
844 {
845 SLMP_INFO *info = tty->driver_data;
846 unsigned long flags;
847
848 if (debug_level >= DEBUG_LEVEL_INFO)
849 printk("%s(%d):%s hangup()\n",
850 __FILE__,__LINE__, info->device_name );
851
852 if (sanity_check(info, tty->name, "hangup"))
853 return;
854
855 mutex_lock(&info->port.mutex);
856 flush_buffer(tty);
857 shutdown(info);
858
859 spin_lock_irqsave(&info->port.lock, flags);
860 info->port.count = 0;
861 info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
862 info->port.tty = NULL;
863 spin_unlock_irqrestore(&info->port.lock, flags);
864 mutex_unlock(&info->port.mutex);
865
866 wake_up_interruptible(&info->port.open_wait);
867 }
868
869 /* Set new termios settings
870 */
871 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)
872 {
873 SLMP_INFO *info = tty->driver_data;
874 unsigned long flags;
875
876 if (debug_level >= DEBUG_LEVEL_INFO)
877 printk("%s(%d):%s set_termios()\n", __FILE__,__LINE__,
878 tty->driver->name );
879
880 change_params(info);
881
882 /* Handle transition to B0 status */
883 if (old_termios->c_cflag & CBAUD &&
884 !(tty->termios.c_cflag & CBAUD)) {
885 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
886 spin_lock_irqsave(&info->lock,flags);
887 set_signals(info);
888 spin_unlock_irqrestore(&info->lock,flags);
889 }
890
891 /* Handle transition away from B0 status */
892 if (!(old_termios->c_cflag & CBAUD) &&
893 tty->termios.c_cflag & CBAUD) {
894 info->serial_signals |= SerialSignal_DTR;
895 if (!(tty->termios.c_cflag & CRTSCTS) ||
896 !test_bit(TTY_THROTTLED, &tty->flags)) {
897 info->serial_signals |= SerialSignal_RTS;
898 }
899 spin_lock_irqsave(&info->lock,flags);
900 set_signals(info);
901 spin_unlock_irqrestore(&info->lock,flags);
902 }
903
904 /* Handle turning off CRTSCTS */
905 if (old_termios->c_cflag & CRTSCTS &&
906 !(tty->termios.c_cflag & CRTSCTS)) {
907 tty->hw_stopped = 0;
908 tx_release(tty);
909 }
910 }
911
912 /* Send a block of data
913 *
914 * Arguments:
915 *
916 * tty pointer to tty information structure
917 * buf pointer to buffer containing send data
918 * count size of send data in bytes
919 *
920 * Return Value: number of characters written
921 */
922 static int write(struct tty_struct *tty,
923 const unsigned char *buf, int count)
924 {
925 int c, ret = 0;
926 SLMP_INFO *info = tty->driver_data;
927 unsigned long flags;
928
929 if (debug_level >= DEBUG_LEVEL_INFO)
930 printk("%s(%d):%s write() count=%d\n",
931 __FILE__,__LINE__,info->device_name,count);
932
933 if (sanity_check(info, tty->name, "write"))
934 goto cleanup;
935
936 if (!info->tx_buf)
937 goto cleanup;
938
939 if (info->params.mode == MGSL_MODE_HDLC) {
940 if (count > info->max_frame_size) {
941 ret = -EIO;
942 goto cleanup;
943 }
944 if (info->tx_active)
945 goto cleanup;
946 if (info->tx_count) {
947 /* send accumulated data from send_char() calls */
948 /* as frame and wait before accepting more data. */
949 tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
950 goto start;
951 }
952 ret = info->tx_count = count;
953 tx_load_dma_buffer(info, buf, count);
954 goto start;
955 }
956
957 for (;;) {
958 c = min_t(int, count,
959 min(info->max_frame_size - info->tx_count - 1,
960 info->max_frame_size - info->tx_put));
961 if (c <= 0)
962 break;
963
964 memcpy(info->tx_buf + info->tx_put, buf, c);
965
966 spin_lock_irqsave(&info->lock,flags);
967 info->tx_put += c;
968 if (info->tx_put >= info->max_frame_size)
969 info->tx_put -= info->max_frame_size;
970 info->tx_count += c;
971 spin_unlock_irqrestore(&info->lock,flags);
972
973 buf += c;
974 count -= c;
975 ret += c;
976 }
977
978 if (info->params.mode == MGSL_MODE_HDLC) {
979 if (count) {
980 ret = info->tx_count = 0;
981 goto cleanup;
982 }
983 tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
984 }
985 start:
986 if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
987 spin_lock_irqsave(&info->lock,flags);
988 if (!info->tx_active)
989 tx_start(info);
990 spin_unlock_irqrestore(&info->lock,flags);
991 }
992
993 cleanup:
994 if (debug_level >= DEBUG_LEVEL_INFO)
995 printk( "%s(%d):%s write() returning=%d\n",
996 __FILE__,__LINE__,info->device_name,ret);
997 return ret;
998 }
999
1000 /* Add a character to the transmit buffer.
1001 */
1002 static int put_char(struct tty_struct *tty, unsigned char ch)
1003 {
1004 SLMP_INFO *info = tty->driver_data;
1005 unsigned long flags;
1006 int ret = 0;
1007
1008 if ( debug_level >= DEBUG_LEVEL_INFO ) {
1009 printk( "%s(%d):%s put_char(%d)\n",
1010 __FILE__,__LINE__,info->device_name,ch);
1011 }
1012
1013 if (sanity_check(info, tty->name, "put_char"))
1014 return 0;
1015
1016 if (!info->tx_buf)
1017 return 0;
1018
1019 spin_lock_irqsave(&info->lock,flags);
1020
1021 if ( (info->params.mode != MGSL_MODE_HDLC) ||
1022 !info->tx_active ) {
1023
1024 if (info->tx_count < info->max_frame_size - 1) {
1025 info->tx_buf[info->tx_put++] = ch;
1026 if (info->tx_put >= info->max_frame_size)
1027 info->tx_put -= info->max_frame_size;
1028 info->tx_count++;
1029 ret = 1;
1030 }
1031 }
1032
1033 spin_unlock_irqrestore(&info->lock,flags);
1034 return ret;
1035 }
1036
1037 /* Send a high-priority XON/XOFF character
1038 */
1039 static void send_xchar(struct tty_struct *tty, char ch)
1040 {
1041 SLMP_INFO *info = tty->driver_data;
1042 unsigned long flags;
1043
1044 if (debug_level >= DEBUG_LEVEL_INFO)
1045 printk("%s(%d):%s send_xchar(%d)\n",
1046 __FILE__,__LINE__, info->device_name, ch );
1047
1048 if (sanity_check(info, tty->name, "send_xchar"))
1049 return;
1050
1051 info->x_char = ch;
1052 if (ch) {
1053 /* Make sure transmit interrupts are on */
1054 spin_lock_irqsave(&info->lock,flags);
1055 if (!info->tx_enabled)
1056 tx_start(info);
1057 spin_unlock_irqrestore(&info->lock,flags);
1058 }
1059 }
1060
1061 /* Wait until the transmitter is empty.
1062 */
1063 static void wait_until_sent(struct tty_struct *tty, int timeout)
1064 {
1065 SLMP_INFO * info = tty->driver_data;
1066 unsigned long orig_jiffies, char_time;
1067
1068 if (!info )
1069 return;
1070
1071 if (debug_level >= DEBUG_LEVEL_INFO)
1072 printk("%s(%d):%s wait_until_sent() entry\n",
1073 __FILE__,__LINE__, info->device_name );
1074
1075 if (sanity_check(info, tty->name, "wait_until_sent"))
1076 return;
1077
1078 if (!test_bit(ASYNCB_INITIALIZED, &info->port.flags))
1079 goto exit;
1080
1081 orig_jiffies = jiffies;
1082
1083 /* Set check interval to 1/5 of estimated time to
1084 * send a character, and make it at least 1. The check
1085 * interval should also be less than the timeout.
1086 * Note: use tight timings here to satisfy the NIST-PCTS.
1087 */
1088
1089 if ( info->params.data_rate ) {
1090 char_time = info->timeout/(32 * 5);
1091 if (!char_time)
1092 char_time++;
1093 } else
1094 char_time = 1;
1095
1096 if (timeout)
1097 char_time = min_t(unsigned long, char_time, timeout);
1098
1099 if ( info->params.mode == MGSL_MODE_HDLC ) {
1100 while (info->tx_active) {
1101 msleep_interruptible(jiffies_to_msecs(char_time));
1102 if (signal_pending(current))
1103 break;
1104 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1105 break;
1106 }
1107 } else {
1108 /*
1109 * TODO: determine if there is something similar to USC16C32
1110 * TXSTATUS_ALL_SENT status
1111 */
1112 while ( info->tx_active && info->tx_enabled) {
1113 msleep_interruptible(jiffies_to_msecs(char_time));
1114 if (signal_pending(current))
1115 break;
1116 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1117 break;
1118 }
1119 }
1120
1121 exit:
1122 if (debug_level >= DEBUG_LEVEL_INFO)
1123 printk("%s(%d):%s wait_until_sent() exit\n",
1124 __FILE__,__LINE__, info->device_name );
1125 }
1126
1127 /* Return the count of free bytes in transmit buffer
1128 */
1129 static int write_room(struct tty_struct *tty)
1130 {
1131 SLMP_INFO *info = tty->driver_data;
1132 int ret;
1133
1134 if (sanity_check(info, tty->name, "write_room"))
1135 return 0;
1136
1137 if (info->params.mode == MGSL_MODE_HDLC) {
1138 ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
1139 } else {
1140 ret = info->max_frame_size - info->tx_count - 1;
1141 if (ret < 0)
1142 ret = 0;
1143 }
1144
1145 if (debug_level >= DEBUG_LEVEL_INFO)
1146 printk("%s(%d):%s write_room()=%d\n",
1147 __FILE__, __LINE__, info->device_name, ret);
1148
1149 return ret;
1150 }
1151
1152 /* enable transmitter and send remaining buffered characters
1153 */
1154 static void flush_chars(struct tty_struct *tty)
1155 {
1156 SLMP_INFO *info = tty->driver_data;
1157 unsigned long flags;
1158
1159 if ( debug_level >= DEBUG_LEVEL_INFO )
1160 printk( "%s(%d):%s flush_chars() entry tx_count=%d\n",
1161 __FILE__,__LINE__,info->device_name,info->tx_count);
1162
1163 if (sanity_check(info, tty->name, "flush_chars"))
1164 return;
1165
1166 if (info->tx_count <= 0 || tty->stopped || tty->hw_stopped ||
1167 !info->tx_buf)
1168 return;
1169
1170 if ( debug_level >= DEBUG_LEVEL_INFO )
1171 printk( "%s(%d):%s flush_chars() entry, starting transmitter\n",
1172 __FILE__,__LINE__,info->device_name );
1173
1174 spin_lock_irqsave(&info->lock,flags);
1175
1176 if (!info->tx_active) {
1177 if ( (info->params.mode == MGSL_MODE_HDLC) &&
1178 info->tx_count ) {
1179 /* operating in synchronous (frame oriented) mode */
1180 /* copy data from circular tx_buf to */
1181 /* transmit DMA buffer. */
1182 tx_load_dma_buffer(info,
1183 info->tx_buf,info->tx_count);
1184 }
1185 tx_start(info);
1186 }
1187
1188 spin_unlock_irqrestore(&info->lock,flags);
1189 }
1190
1191 /* Discard all data in the send buffer
1192 */
1193 static void flush_buffer(struct tty_struct *tty)
1194 {
1195 SLMP_INFO *info = tty->driver_data;
1196 unsigned long flags;
1197
1198 if (debug_level >= DEBUG_LEVEL_INFO)
1199 printk("%s(%d):%s flush_buffer() entry\n",
1200 __FILE__,__LINE__, info->device_name );
1201
1202 if (sanity_check(info, tty->name, "flush_buffer"))
1203 return;
1204
1205 spin_lock_irqsave(&info->lock,flags);
1206 info->tx_count = info->tx_put = info->tx_get = 0;
1207 del_timer(&info->tx_timer);
1208 spin_unlock_irqrestore(&info->lock,flags);
1209
1210 tty_wakeup(tty);
1211 }
1212
1213 /* throttle (stop) transmitter
1214 */
1215 static void tx_hold(struct tty_struct *tty)
1216 {
1217 SLMP_INFO *info = tty->driver_data;
1218 unsigned long flags;
1219
1220 if (sanity_check(info, tty->name, "tx_hold"))
1221 return;
1222
1223 if ( debug_level >= DEBUG_LEVEL_INFO )
1224 printk("%s(%d):%s tx_hold()\n",
1225 __FILE__,__LINE__,info->device_name);
1226
1227 spin_lock_irqsave(&info->lock,flags);
1228 if (info->tx_enabled)
1229 tx_stop(info);
1230 spin_unlock_irqrestore(&info->lock,flags);
1231 }
1232
1233 /* release (start) transmitter
1234 */
1235 static void tx_release(struct tty_struct *tty)
1236 {
1237 SLMP_INFO *info = tty->driver_data;
1238 unsigned long flags;
1239
1240 if (sanity_check(info, tty->name, "tx_release"))
1241 return;
1242
1243 if ( debug_level >= DEBUG_LEVEL_INFO )
1244 printk("%s(%d):%s tx_release()\n",
1245 __FILE__,__LINE__,info->device_name);
1246
1247 spin_lock_irqsave(&info->lock,flags);
1248 if (!info->tx_enabled)
1249 tx_start(info);
1250 spin_unlock_irqrestore(&info->lock,flags);
1251 }
1252
1253 /* Service an IOCTL request
1254 *
1255 * Arguments:
1256 *
1257 * tty pointer to tty instance data
1258 * cmd IOCTL command code
1259 * arg command argument/context
1260 *
1261 * Return Value: 0 if success, otherwise error code
1262 */
1263 static int ioctl(struct tty_struct *tty,
1264 unsigned int cmd, unsigned long arg)
1265 {
1266 SLMP_INFO *info = tty->driver_data;
1267 void __user *argp = (void __user *)arg;
1268
1269 if (debug_level >= DEBUG_LEVEL_INFO)
1270 printk("%s(%d):%s ioctl() cmd=%08X\n", __FILE__,__LINE__,
1271 info->device_name, cmd );
1272
1273 if (sanity_check(info, tty->name, "ioctl"))
1274 return -ENODEV;
1275
1276 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1277 (cmd != TIOCMIWAIT)) {
1278 if (tty->flags & (1 << TTY_IO_ERROR))
1279 return -EIO;
1280 }
1281
1282 switch (cmd) {
1283 case MGSL_IOCGPARAMS:
1284 return get_params(info, argp);
1285 case MGSL_IOCSPARAMS:
1286 return set_params(info, argp);
1287 case MGSL_IOCGTXIDLE:
1288 return get_txidle(info, argp);
1289 case MGSL_IOCSTXIDLE:
1290 return set_txidle(info, (int)arg);
1291 case MGSL_IOCTXENABLE:
1292 return tx_enable(info, (int)arg);
1293 case MGSL_IOCRXENABLE:
1294 return rx_enable(info, (int)arg);
1295 case MGSL_IOCTXABORT:
1296 return tx_abort(info);
1297 case MGSL_IOCGSTATS:
1298 return get_stats(info, argp);
1299 case MGSL_IOCWAITEVENT:
1300 return wait_mgsl_event(info, argp);
1301 case MGSL_IOCLOOPTXDONE:
1302 return 0; // TODO: Not supported, need to document
1303 /* Wait for modem input (DCD,RI,DSR,CTS) change
1304 * as specified by mask in arg (TIOCM_RNG/DSR/CD/CTS)
1305 */
1306 case TIOCMIWAIT:
1307 return modem_input_wait(info,(int)arg);
1308
1309 /*
1310 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1311 * Return: write counters to the user passed counter struct
1312 * NB: both 1->0 and 0->1 transitions are counted except for
1313 * RI where only 0->1 is counted.
1314 */
1315 default:
1316 return -ENOIOCTLCMD;
1317 }
1318 return 0;
1319 }
1320
1321 static int get_icount(struct tty_struct *tty,
1322 struct serial_icounter_struct *icount)
1323 {
1324 SLMP_INFO *info = tty->driver_data;
1325 struct mgsl_icount cnow; /* kernel counter temps */
1326 unsigned long flags;
1327
1328 spin_lock_irqsave(&info->lock,flags);
1329 cnow = info->icount;
1330 spin_unlock_irqrestore(&info->lock,flags);
1331
1332 icount->cts = cnow.cts;
1333 icount->dsr = cnow.dsr;
1334 icount->rng = cnow.rng;
1335 icount->dcd = cnow.dcd;
1336 icount->rx = cnow.rx;
1337 icount->tx = cnow.tx;
1338 icount->frame = cnow.frame;
1339 icount->overrun = cnow.overrun;
1340 icount->parity = cnow.parity;
1341 icount->brk = cnow.brk;
1342 icount->buf_overrun = cnow.buf_overrun;
1343
1344 return 0;
1345 }
1346
1347 /*
1348 * /proc fs routines....
1349 */
1350
1351 static inline void line_info(struct seq_file *m, SLMP_INFO *info)
1352 {
1353 char stat_buf[30];
1354 unsigned long flags;
1355
1356 seq_printf(m, "%s: SCABase=%08x Mem=%08X StatusControl=%08x LCR=%08X\n"
1357 "\tIRQ=%d MaxFrameSize=%u\n",
1358 info->device_name,
1359 info->phys_sca_base,
1360 info->phys_memory_base,
1361 info->phys_statctrl_base,
1362 info->phys_lcr_base,
1363 info->irq_level,
1364 info->max_frame_size );
1365
1366 /* output current serial signal states */
1367 spin_lock_irqsave(&info->lock,flags);
1368 get_signals(info);
1369 spin_unlock_irqrestore(&info->lock,flags);
1370
1371 stat_buf[0] = 0;
1372 stat_buf[1] = 0;
1373 if (info->serial_signals & SerialSignal_RTS)
1374 strcat(stat_buf, "|RTS");
1375 if (info->serial_signals & SerialSignal_CTS)
1376 strcat(stat_buf, "|CTS");
1377 if (info->serial_signals & SerialSignal_DTR)
1378 strcat(stat_buf, "|DTR");
1379 if (info->serial_signals & SerialSignal_DSR)
1380 strcat(stat_buf, "|DSR");
1381 if (info->serial_signals & SerialSignal_DCD)
1382 strcat(stat_buf, "|CD");
1383 if (info->serial_signals & SerialSignal_RI)
1384 strcat(stat_buf, "|RI");
1385
1386 if (info->params.mode == MGSL_MODE_HDLC) {
1387 seq_printf(m, "\tHDLC txok:%d rxok:%d",
1388 info->icount.txok, info->icount.rxok);
1389 if (info->icount.txunder)
1390 seq_printf(m, " txunder:%d", info->icount.txunder);
1391 if (info->icount.txabort)
1392 seq_printf(m, " txabort:%d", info->icount.txabort);
1393 if (info->icount.rxshort)
1394 seq_printf(m, " rxshort:%d", info->icount.rxshort);
1395 if (info->icount.rxlong)
1396 seq_printf(m, " rxlong:%d", info->icount.rxlong);
1397 if (info->icount.rxover)
1398 seq_printf(m, " rxover:%d", info->icount.rxover);
1399 if (info->icount.rxcrc)
1400 seq_printf(m, " rxlong:%d", info->icount.rxcrc);
1401 } else {
1402 seq_printf(m, "\tASYNC tx:%d rx:%d",
1403 info->icount.tx, info->icount.rx);
1404 if (info->icount.frame)
1405 seq_printf(m, " fe:%d", info->icount.frame);
1406 if (info->icount.parity)
1407 seq_printf(m, " pe:%d", info->icount.parity);
1408 if (info->icount.brk)
1409 seq_printf(m, " brk:%d", info->icount.brk);
1410 if (info->icount.overrun)
1411 seq_printf(m, " oe:%d", info->icount.overrun);
1412 }
1413
1414 /* Append serial signal status to end */
1415 seq_printf(m, " %s\n", stat_buf+1);
1416
1417 seq_printf(m, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
1418 info->tx_active,info->bh_requested,info->bh_running,
1419 info->pending_bh);
1420 }
1421
1422 /* Called to print information about devices
1423 */
1424 static int synclinkmp_proc_show(struct seq_file *m, void *v)
1425 {
1426 SLMP_INFO *info;
1427
1428 seq_printf(m, "synclinkmp driver:%s\n", driver_version);
1429
1430 info = synclinkmp_device_list;
1431 while( info ) {
1432 line_info(m, info);
1433 info = info->next_device;
1434 }
1435 return 0;
1436 }
1437
1438 static int synclinkmp_proc_open(struct inode *inode, struct file *file)
1439 {
1440 return single_open(file, synclinkmp_proc_show, NULL);
1441 }
1442
1443 static const struct file_operations synclinkmp_proc_fops = {
1444 .owner = THIS_MODULE,
1445 .open = synclinkmp_proc_open,
1446 .read = seq_read,
1447 .llseek = seq_lseek,
1448 .release = single_release,
1449 };
1450
1451 /* Return the count of bytes in transmit buffer
1452 */
1453 static int chars_in_buffer(struct tty_struct *tty)
1454 {
1455 SLMP_INFO *info = tty->driver_data;
1456
1457 if (sanity_check(info, tty->name, "chars_in_buffer"))
1458 return 0;
1459
1460 if (debug_level >= DEBUG_LEVEL_INFO)
1461 printk("%s(%d):%s chars_in_buffer()=%d\n",
1462 __FILE__, __LINE__, info->device_name, info->tx_count);
1463
1464 return info->tx_count;
1465 }
1466
1467 /* Signal remote device to throttle send data (our receive data)
1468 */
1469 static void throttle(struct tty_struct * tty)
1470 {
1471 SLMP_INFO *info = tty->driver_data;
1472 unsigned long flags;
1473
1474 if (debug_level >= DEBUG_LEVEL_INFO)
1475 printk("%s(%d):%s throttle() entry\n",
1476 __FILE__,__LINE__, info->device_name );
1477
1478 if (sanity_check(info, tty->name, "throttle"))
1479 return;
1480
1481 if (I_IXOFF(tty))
1482 send_xchar(tty, STOP_CHAR(tty));
1483
1484 if (tty->termios.c_cflag & CRTSCTS) {
1485 spin_lock_irqsave(&info->lock,flags);
1486 info->serial_signals &= ~SerialSignal_RTS;
1487 set_signals(info);
1488 spin_unlock_irqrestore(&info->lock,flags);
1489 }
1490 }
1491
1492 /* Signal remote device to stop throttling send data (our receive data)
1493 */
1494 static void unthrottle(struct tty_struct * tty)
1495 {
1496 SLMP_INFO *info = tty->driver_data;
1497 unsigned long flags;
1498
1499 if (debug_level >= DEBUG_LEVEL_INFO)
1500 printk("%s(%d):%s unthrottle() entry\n",
1501 __FILE__,__LINE__, info->device_name );
1502
1503 if (sanity_check(info, tty->name, "unthrottle"))
1504 return;
1505
1506 if (I_IXOFF(tty)) {
1507 if (info->x_char)
1508 info->x_char = 0;
1509 else
1510 send_xchar(tty, START_CHAR(tty));
1511 }
1512
1513 if (tty->termios.c_cflag & CRTSCTS) {
1514 spin_lock_irqsave(&info->lock,flags);
1515 info->serial_signals |= SerialSignal_RTS;
1516 set_signals(info);
1517 spin_unlock_irqrestore(&info->lock,flags);
1518 }
1519 }
1520
1521 /* set or clear transmit break condition
1522 * break_state -1=set break condition, 0=clear
1523 */
1524 static int set_break(struct tty_struct *tty, int break_state)
1525 {
1526 unsigned char RegValue;
1527 SLMP_INFO * info = tty->driver_data;
1528 unsigned long flags;
1529
1530 if (debug_level >= DEBUG_LEVEL_INFO)
1531 printk("%s(%d):%s set_break(%d)\n",
1532 __FILE__,__LINE__, info->device_name, break_state);
1533
1534 if (sanity_check(info, tty->name, "set_break"))
1535 return -EINVAL;
1536
1537 spin_lock_irqsave(&info->lock,flags);
1538 RegValue = read_reg(info, CTL);
1539 if (break_state == -1)
1540 RegValue |= BIT3;
1541 else
1542 RegValue &= ~BIT3;
1543 write_reg(info, CTL, RegValue);
1544 spin_unlock_irqrestore(&info->lock,flags);
1545 return 0;
1546 }
1547
1548 #if SYNCLINK_GENERIC_HDLC
1549
1550 /**
1551 * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
1552 * set encoding and frame check sequence (FCS) options
1553 *
1554 * dev pointer to network device structure
1555 * encoding serial encoding setting
1556 * parity FCS setting
1557 *
1558 * returns 0 if success, otherwise error code
1559 */
1560 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
1561 unsigned short parity)
1562 {
1563 SLMP_INFO *info = dev_to_port(dev);
1564 unsigned char new_encoding;
1565 unsigned short new_crctype;
1566
1567 /* return error if TTY interface open */
1568 if (info->port.count)
1569 return -EBUSY;
1570
1571 switch (encoding)
1572 {
1573 case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break;
1574 case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
1575 case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
1576 case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
1577 case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
1578 default: return -EINVAL;
1579 }
1580
1581 switch (parity)
1582 {
1583 case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break;
1584 case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
1585 case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
1586 default: return -EINVAL;
1587 }
1588
1589 info->params.encoding = new_encoding;
1590 info->params.crc_type = new_crctype;
1591
1592 /* if network interface up, reprogram hardware */
1593 if (info->netcount)
1594 program_hw(info);
1595
1596 return 0;
1597 }
1598
1599 /**
1600 * called by generic HDLC layer to send frame
1601 *
1602 * skb socket buffer containing HDLC frame
1603 * dev pointer to network device structure
1604 */
1605 static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb,
1606 struct net_device *dev)
1607 {
1608 SLMP_INFO *info = dev_to_port(dev);
1609 unsigned long flags;
1610
1611 if (debug_level >= DEBUG_LEVEL_INFO)
1612 printk(KERN_INFO "%s:hdlc_xmit(%s)\n",__FILE__,dev->name);
1613
1614 /* stop sending until this frame completes */
1615 netif_stop_queue(dev);
1616
1617 /* copy data to device buffers */
1618 info->tx_count = skb->len;
1619 tx_load_dma_buffer(info, skb->data, skb->len);
1620
1621 /* update network statistics */
1622 dev->stats.tx_packets++;
1623 dev->stats.tx_bytes += skb->len;
1624
1625 /* done with socket buffer, so free it */
1626 dev_kfree_skb(skb);
1627
1628 /* save start time for transmit timeout detection */
1629 dev->trans_start = jiffies;
1630
1631 /* start hardware transmitter if necessary */
1632 spin_lock_irqsave(&info->lock,flags);
1633 if (!info->tx_active)
1634 tx_start(info);
1635 spin_unlock_irqrestore(&info->lock,flags);
1636
1637 return NETDEV_TX_OK;
1638 }
1639
1640 /**
1641 * called by network layer when interface enabled
1642 * claim resources and initialize hardware
1643 *
1644 * dev pointer to network device structure
1645 *
1646 * returns 0 if success, otherwise error code
1647 */
1648 static int hdlcdev_open(struct net_device *dev)
1649 {
1650 SLMP_INFO *info = dev_to_port(dev);
1651 int rc;
1652 unsigned long flags;
1653
1654 if (debug_level >= DEBUG_LEVEL_INFO)
1655 printk("%s:hdlcdev_open(%s)\n",__FILE__,dev->name);
1656
1657 /* generic HDLC layer open processing */
1658 if ((rc = hdlc_open(dev)))
1659 return rc;
1660
1661 /* arbitrate between network and tty opens */
1662 spin_lock_irqsave(&info->netlock, flags);
1663 if (info->port.count != 0 || info->netcount != 0) {
1664 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
1665 spin_unlock_irqrestore(&info->netlock, flags);
1666 return -EBUSY;
1667 }
1668 info->netcount=1;
1669 spin_unlock_irqrestore(&info->netlock, flags);
1670
1671 /* claim resources and init adapter */
1672 if ((rc = startup(info)) != 0) {
1673 spin_lock_irqsave(&info->netlock, flags);
1674 info->netcount=0;
1675 spin_unlock_irqrestore(&info->netlock, flags);
1676 return rc;
1677 }
1678
1679 /* assert RTS and DTR, apply hardware settings */
1680 info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
1681 program_hw(info);
1682
1683 /* enable network layer transmit */
1684 dev->trans_start = jiffies;
1685 netif_start_queue(dev);
1686
1687 /* inform generic HDLC layer of current DCD status */
1688 spin_lock_irqsave(&info->lock, flags);
1689 get_signals(info);
1690 spin_unlock_irqrestore(&info->lock, flags);
1691 if (info->serial_signals & SerialSignal_DCD)
1692 netif_carrier_on(dev);
1693 else
1694 netif_carrier_off(dev);
1695 return 0;
1696 }
1697
1698 /**
1699 * called by network layer when interface is disabled
1700 * shutdown hardware and release resources
1701 *
1702 * dev pointer to network device structure
1703 *
1704 * returns 0 if success, otherwise error code
1705 */
1706 static int hdlcdev_close(struct net_device *dev)
1707 {
1708 SLMP_INFO *info = dev_to_port(dev);
1709 unsigned long flags;
1710
1711 if (debug_level >= DEBUG_LEVEL_INFO)
1712 printk("%s:hdlcdev_close(%s)\n",__FILE__,dev->name);
1713
1714 netif_stop_queue(dev);
1715
1716 /* shutdown adapter and release resources */
1717 shutdown(info);
1718
1719 hdlc_close(dev);
1720
1721 spin_lock_irqsave(&info->netlock, flags);
1722 info->netcount=0;
1723 spin_unlock_irqrestore(&info->netlock, flags);
1724
1725 return 0;
1726 }
1727
1728 /**
1729 * called by network layer to process IOCTL call to network device
1730 *
1731 * dev pointer to network device structure
1732 * ifr pointer to network interface request structure
1733 * cmd IOCTL command code
1734 *
1735 * returns 0 if success, otherwise error code
1736 */
1737 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1738 {
1739 const size_t size = sizeof(sync_serial_settings);
1740 sync_serial_settings new_line;
1741 sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
1742 SLMP_INFO *info = dev_to_port(dev);
1743 unsigned int flags;
1744
1745 if (debug_level >= DEBUG_LEVEL_INFO)
1746 printk("%s:hdlcdev_ioctl(%s)\n",__FILE__,dev->name);
1747
1748 /* return error if TTY interface open */
1749 if (info->port.count)
1750 return -EBUSY;
1751
1752 if (cmd != SIOCWANDEV)
1753 return hdlc_ioctl(dev, ifr, cmd);
1754
1755 switch(ifr->ifr_settings.type) {
1756 case IF_GET_IFACE: /* return current sync_serial_settings */
1757
1758 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
1759 if (ifr->ifr_settings.size < size) {
1760 ifr->ifr_settings.size = size; /* data size wanted */
1761 return -ENOBUFS;
1762 }
1763
1764 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1765 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1766 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1767 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
1768
1769 switch (flags){
1770 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
1771 case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break;
1772 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break;
1773 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
1774 default: new_line.clock_type = CLOCK_DEFAULT;
1775 }
1776
1777 new_line.clock_rate = info->params.clock_speed;
1778 new_line.loopback = info->params.loopback ? 1:0;
1779
1780 if (copy_to_user(line, &new_line, size))
1781 return -EFAULT;
1782 return 0;
1783
1784 case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
1785
1786 if(!capable(CAP_NET_ADMIN))
1787 return -EPERM;
1788 if (copy_from_user(&new_line, line, size))
1789 return -EFAULT;
1790
1791 switch (new_line.clock_type)
1792 {
1793 case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
1794 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
1795 case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break;
1796 case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break;
1797 case CLOCK_DEFAULT: flags = info->params.flags &
1798 (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1799 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1800 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1801 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); break;
1802 default: return -EINVAL;
1803 }
1804
1805 if (new_line.loopback != 0 && new_line.loopback != 1)
1806 return -EINVAL;
1807
1808 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1809 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1810 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1811 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
1812 info->params.flags |= flags;
1813
1814 info->params.loopback = new_line.loopback;
1815
1816 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
1817 info->params.clock_speed = new_line.clock_rate;
1818 else
1819 info->params.clock_speed = 0;
1820
1821 /* if network interface up, reprogram hardware */
1822 if (info->netcount)
1823 program_hw(info);
1824 return 0;
1825
1826 default:
1827 return hdlc_ioctl(dev, ifr, cmd);
1828 }
1829 }
1830
1831 /**
1832 * called by network layer when transmit timeout is detected
1833 *
1834 * dev pointer to network device structure
1835 */
1836 static void hdlcdev_tx_timeout(struct net_device *dev)
1837 {
1838 SLMP_INFO *info = dev_to_port(dev);
1839 unsigned long flags;
1840
1841 if (debug_level >= DEBUG_LEVEL_INFO)
1842 printk("hdlcdev_tx_timeout(%s)\n",dev->name);
1843
1844 dev->stats.tx_errors++;
1845 dev->stats.tx_aborted_errors++;
1846
1847 spin_lock_irqsave(&info->lock,flags);
1848 tx_stop(info);
1849 spin_unlock_irqrestore(&info->lock,flags);
1850
1851 netif_wake_queue(dev);
1852 }
1853
1854 /**
1855 * called by device driver when transmit completes
1856 * reenable network layer transmit if stopped
1857 *
1858 * info pointer to device instance information
1859 */
1860 static void hdlcdev_tx_done(SLMP_INFO *info)
1861 {
1862 if (netif_queue_stopped(info->netdev))
1863 netif_wake_queue(info->netdev);
1864 }
1865
1866 /**
1867 * called by device driver when frame received
1868 * pass frame to network layer
1869 *
1870 * info pointer to device instance information
1871 * buf pointer to buffer contianing frame data
1872 * size count of data bytes in buf
1873 */
1874 static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size)
1875 {
1876 struct sk_buff *skb = dev_alloc_skb(size);
1877 struct net_device *dev = info->netdev;
1878
1879 if (debug_level >= DEBUG_LEVEL_INFO)
1880 printk("hdlcdev_rx(%s)\n",dev->name);
1881
1882 if (skb == NULL) {
1883 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n",
1884 dev->name);
1885 dev->stats.rx_dropped++;
1886 return;
1887 }
1888
1889 memcpy(skb_put(skb, size), buf, size);
1890
1891 skb->protocol = hdlc_type_trans(skb, dev);
1892
1893 dev->stats.rx_packets++;
1894 dev->stats.rx_bytes += size;
1895
1896 netif_rx(skb);
1897 }
1898
1899 static const struct net_device_ops hdlcdev_ops = {
1900 .ndo_open = hdlcdev_open,
1901 .ndo_stop = hdlcdev_close,
1902 .ndo_change_mtu = hdlc_change_mtu,
1903 .ndo_start_xmit = hdlc_start_xmit,
1904 .ndo_do_ioctl = hdlcdev_ioctl,
1905 .ndo_tx_timeout = hdlcdev_tx_timeout,
1906 };
1907
1908 /**
1909 * called by device driver when adding device instance
1910 * do generic HDLC initialization
1911 *
1912 * info pointer to device instance information
1913 *
1914 * returns 0 if success, otherwise error code
1915 */
1916 static int hdlcdev_init(SLMP_INFO *info)
1917 {
1918 int rc;
1919 struct net_device *dev;
1920 hdlc_device *hdlc;
1921
1922 /* allocate and initialize network and HDLC layer objects */
1923
1924 if (!(dev = alloc_hdlcdev(info))) {
1925 printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
1926 return -ENOMEM;
1927 }
1928
1929 /* for network layer reporting purposes only */
1930 dev->mem_start = info->phys_sca_base;
1931 dev->mem_end = info->phys_sca_base + SCA_BASE_SIZE - 1;
1932 dev->irq = info->irq_level;
1933
1934 /* network layer callbacks and settings */
1935 dev->netdev_ops = &hdlcdev_ops;
1936 dev->watchdog_timeo = 10 * HZ;
1937 dev->tx_queue_len = 50;
1938
1939 /* generic HDLC layer callbacks and settings */
1940 hdlc = dev_to_hdlc(dev);
1941 hdlc->attach = hdlcdev_attach;
1942 hdlc->xmit = hdlcdev_xmit;
1943
1944 /* register objects with HDLC layer */
1945 if ((rc = register_hdlc_device(dev))) {
1946 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
1947 free_netdev(dev);
1948 return rc;
1949 }
1950
1951 info->netdev = dev;
1952 return 0;
1953 }
1954
1955 /**
1956 * called by device driver when removing device instance
1957 * do generic HDLC cleanup
1958 *
1959 * info pointer to device instance information
1960 */
1961 static void hdlcdev_exit(SLMP_INFO *info)
1962 {
1963 unregister_hdlc_device(info->netdev);
1964 free_netdev(info->netdev);
1965 info->netdev = NULL;
1966 }
1967
1968 #endif /* CONFIG_HDLC */
1969
1970
1971 /* Return next bottom half action to perform.
1972 * Return Value: BH action code or 0 if nothing to do.
1973 */
1974 static int bh_action(SLMP_INFO *info)
1975 {
1976 unsigned long flags;
1977 int rc = 0;
1978
1979 spin_lock_irqsave(&info->lock,flags);
1980
1981 if (info->pending_bh & BH_RECEIVE) {
1982 info->pending_bh &= ~BH_RECEIVE;
1983 rc = BH_RECEIVE;
1984 } else if (info->pending_bh & BH_TRANSMIT) {
1985 info->pending_bh &= ~BH_TRANSMIT;
1986 rc = BH_TRANSMIT;
1987 } else if (info->pending_bh & BH_STATUS) {
1988 info->pending_bh &= ~BH_STATUS;
1989 rc = BH_STATUS;
1990 }
1991
1992 if (!rc) {
1993 /* Mark BH routine as complete */
1994 info->bh_running = false;
1995 info->bh_requested = false;
1996 }
1997
1998 spin_unlock_irqrestore(&info->lock,flags);
1999
2000 return rc;
2001 }
2002
2003 /* Perform bottom half processing of work items queued by ISR.
2004 */
2005 static void bh_handler(struct work_struct *work)
2006 {
2007 SLMP_INFO *info = container_of(work, SLMP_INFO, task);
2008 int action;
2009
2010 if ( debug_level >= DEBUG_LEVEL_BH )
2011 printk( "%s(%d):%s bh_handler() entry\n",
2012 __FILE__,__LINE__,info->device_name);
2013
2014 info->bh_running = true;
2015
2016 while((action = bh_action(info)) != 0) {
2017
2018 /* Process work item */
2019 if ( debug_level >= DEBUG_LEVEL_BH )
2020 printk( "%s(%d):%s bh_handler() work item action=%d\n",
2021 __FILE__,__LINE__,info->device_name, action);
2022
2023 switch (action) {
2024
2025 case BH_RECEIVE:
2026 bh_receive(info);
2027 break;
2028 case BH_TRANSMIT:
2029 bh_transmit(info);
2030 break;
2031 case BH_STATUS:
2032 bh_status(info);
2033 break;
2034 default:
2035 /* unknown work item ID */
2036 printk("%s(%d):%s Unknown work item ID=%08X!\n",
2037 __FILE__,__LINE__,info->device_name,action);
2038 break;
2039 }
2040 }
2041
2042 if ( debug_level >= DEBUG_LEVEL_BH )
2043 printk( "%s(%d):%s bh_handler() exit\n",
2044 __FILE__,__LINE__,info->device_name);
2045 }
2046
2047 static void bh_receive(SLMP_INFO *info)
2048 {
2049 if ( debug_level >= DEBUG_LEVEL_BH )
2050 printk( "%s(%d):%s bh_receive()\n",
2051 __FILE__,__LINE__,info->device_name);
2052
2053 while( rx_get_frame(info) );
2054 }
2055
2056 static void bh_transmit(SLMP_INFO *info)
2057 {
2058 struct tty_struct *tty = info->port.tty;
2059
2060 if ( debug_level >= DEBUG_LEVEL_BH )
2061 printk( "%s(%d):%s bh_transmit() entry\n",
2062 __FILE__,__LINE__,info->device_name);
2063
2064 if (tty)
2065 tty_wakeup(tty);
2066 }
2067
2068 static void bh_status(SLMP_INFO *info)
2069 {
2070 if ( debug_level >= DEBUG_LEVEL_BH )
2071 printk( "%s(%d):%s bh_status() entry\n",
2072 __FILE__,__LINE__,info->device_name);
2073
2074 info->ri_chkcount = 0;
2075 info->dsr_chkcount = 0;
2076 info->dcd_chkcount = 0;
2077 info->cts_chkcount = 0;
2078 }
2079
2080 static void isr_timer(SLMP_INFO * info)
2081 {
2082 unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0;
2083
2084 /* IER2<7..4> = timer<3..0> interrupt enables (0=disabled) */
2085 write_reg(info, IER2, 0);
2086
2087 /* TMCS, Timer Control/Status Register
2088 *
2089 * 07 CMF, Compare match flag (read only) 1=match
2090 * 06 ECMI, CMF Interrupt Enable: 0=disabled
2091 * 05 Reserved, must be 0
2092 * 04 TME, Timer Enable
2093 * 03..00 Reserved, must be 0
2094 *
2095 * 0000 0000
2096 */
2097 write_reg(info, (unsigned char)(timer + TMCS), 0);
2098
2099 info->irq_occurred = true;
2100
2101 if ( debug_level >= DEBUG_LEVEL_ISR )
2102 printk("%s(%d):%s isr_timer()\n",
2103 __FILE__,__LINE__,info->device_name);
2104 }
2105
2106 static void isr_rxint(SLMP_INFO * info)
2107 {
2108 struct tty_struct *tty = info->port.tty;
2109 struct mgsl_icount *icount = &info->icount;
2110 unsigned char status = read_reg(info, SR1) & info->ie1_value & (FLGD + IDLD + CDCD + BRKD);
2111 unsigned char status2 = read_reg(info, SR2) & info->ie2_value & OVRN;
2112
2113 /* clear status bits */
2114 if (status)
2115 write_reg(info, SR1, status);
2116
2117 if (status2)
2118 write_reg(info, SR2, status2);
2119
2120 if ( debug_level >= DEBUG_LEVEL_ISR )
2121 printk("%s(%d):%s isr_rxint status=%02X %02x\n",
2122 __FILE__,__LINE__,info->device_name,status,status2);
2123
2124 if (info->params.mode == MGSL_MODE_ASYNC) {
2125 if (status & BRKD) {
2126 icount->brk++;
2127
2128 /* process break detection if tty control
2129 * is not set to ignore it
2130 */
2131 if (!(status & info->ignore_status_mask1)) {
2132 if (info->read_status_mask1 & BRKD) {
2133 tty_insert_flip_char(&info->port, 0, TTY_BREAK);
2134 if (tty && (info->port.flags & ASYNC_SAK))
2135 do_SAK(tty);
2136 }
2137 }
2138 }
2139 }
2140 else {
2141 if (status & (FLGD|IDLD)) {
2142 if (status & FLGD)
2143 info->icount.exithunt++;
2144 else if (status & IDLD)
2145 info->icount.rxidle++;
2146 wake_up_interruptible(&info->event_wait_q);
2147 }
2148 }
2149
2150 if (status & CDCD) {
2151 /* simulate a common modem status change interrupt
2152 * for our handler
2153 */
2154 get_signals( info );
2155 isr_io_pin(info,
2156 MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD));
2157 }
2158 }
2159
2160 /*
2161 * handle async rx data interrupts
2162 */
2163 static void isr_rxrdy(SLMP_INFO * info)
2164 {
2165 u16 status;
2166 unsigned char DataByte;
2167 struct mgsl_icount *icount = &info->icount;
2168
2169 if ( debug_level >= DEBUG_LEVEL_ISR )
2170 printk("%s(%d):%s isr_rxrdy\n",
2171 __FILE__,__LINE__,info->device_name);
2172
2173 while((status = read_reg(info,CST0)) & BIT0)
2174 {
2175 int flag = 0;
2176 bool over = false;
2177 DataByte = read_reg(info,TRB);
2178
2179 icount->rx++;
2180
2181 if ( status & (PE + FRME + OVRN) ) {
2182 printk("%s(%d):%s rxerr=%04X\n",
2183 __FILE__,__LINE__,info->device_name,status);
2184
2185 /* update error statistics */
2186 if (status & PE)
2187 icount->parity++;
2188 else if (status & FRME)
2189 icount->frame++;
2190 else if (status & OVRN)
2191 icount->overrun++;
2192
2193 /* discard char if tty control flags say so */
2194 if (status & info->ignore_status_mask2)
2195 continue;
2196
2197 status &= info->read_status_mask2;
2198
2199 if (status & PE)
2200 flag = TTY_PARITY;
2201 else if (status & FRME)
2202 flag = TTY_FRAME;
2203 if (status & OVRN) {
2204 /* Overrun is special, since it's
2205 * reported immediately, and doesn't
2206 * affect the current character
2207 */
2208 over = true;
2209 }
2210 } /* end of if (error) */
2211
2212 tty_insert_flip_char(&info->port, DataByte, flag);
2213 if (over)
2214 tty_insert_flip_char(&info->port, 0, TTY_OVERRUN);
2215 }
2216
2217 if ( debug_level >= DEBUG_LEVEL_ISR ) {
2218 printk("%s(%d):%s rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
2219 __FILE__,__LINE__,info->device_name,
2220 icount->rx,icount->brk,icount->parity,
2221 icount->frame,icount->overrun);
2222 }
2223
2224 tty_flip_buffer_push(&info->port);
2225 }
2226
2227 static void isr_txeom(SLMP_INFO * info, unsigned char status)
2228 {
2229 if ( debug_level >= DEBUG_LEVEL_ISR )
2230 printk("%s(%d):%s isr_txeom status=%02x\n",
2231 __FILE__,__LINE__,info->device_name,status);
2232
2233 write_reg(info, TXDMA + DIR, 0x00); /* disable Tx DMA IRQs */
2234 write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
2235 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2236
2237 if (status & UDRN) {
2238 write_reg(info, CMD, TXRESET);
2239 write_reg(info, CMD, TXENABLE);
2240 } else
2241 write_reg(info, CMD, TXBUFCLR);
2242
2243 /* disable and clear tx interrupts */
2244 info->ie0_value &= ~TXRDYE;
2245 info->ie1_value &= ~(IDLE + UDRN);
2246 write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
2247 write_reg(info, SR1, (unsigned char)(UDRN + IDLE));
2248
2249 if ( info->tx_active ) {
2250 if (info->params.mode != MGSL_MODE_ASYNC) {
2251 if (status & UDRN)
2252 info->icount.txunder++;
2253 else if (status & IDLE)
2254 info->icount.txok++;
2255 }
2256
2257 info->tx_active = false;
2258 info->tx_count = info->tx_put = info->tx_get = 0;
2259
2260 del_timer(&info->tx_timer);
2261
2262 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done ) {
2263 info->serial_signals &= ~SerialSignal_RTS;
2264 info->drop_rts_on_tx_done = false;
2265 set_signals(info);
2266 }
2267
2268 #if SYNCLINK_GENERIC_HDLC
2269 if (info->netcount)
2270 hdlcdev_tx_done(info);
2271 else
2272 #endif
2273 {
2274 if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
2275 tx_stop(info);
2276 return;
2277 }
2278 info->pending_bh |= BH_TRANSMIT;
2279 }
2280 }
2281 }
2282
2283
2284 /*
2285 * handle tx status interrupts
2286 */
2287 static void isr_txint(SLMP_INFO * info)
2288 {
2289 unsigned char status = read_reg(info, SR1) & info->ie1_value & (UDRN + IDLE + CCTS);
2290
2291 /* clear status bits */
2292 write_reg(info, SR1, status);
2293
2294 if ( debug_level >= DEBUG_LEVEL_ISR )
2295 printk("%s(%d):%s isr_txint status=%02x\n",
2296 __FILE__,__LINE__,info->device_name,status);
2297
2298 if (status & (UDRN + IDLE))
2299 isr_txeom(info, status);
2300
2301 if (status & CCTS) {
2302 /* simulate a common modem status change interrupt
2303 * for our handler
2304 */
2305 get_signals( info );
2306 isr_io_pin(info,
2307 MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS));
2308
2309 }
2310 }
2311
2312 /*
2313 * handle async tx data interrupts
2314 */
2315 static void isr_txrdy(SLMP_INFO * info)
2316 {
2317 if ( debug_level >= DEBUG_LEVEL_ISR )
2318 printk("%s(%d):%s isr_txrdy() tx_count=%d\n",
2319 __FILE__,__LINE__,info->device_name,info->tx_count);
2320
2321 if (info->params.mode != MGSL_MODE_ASYNC) {
2322 /* disable TXRDY IRQ, enable IDLE IRQ */
2323 info->ie0_value &= ~TXRDYE;
2324 info->ie1_value |= IDLE;
2325 write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
2326 return;
2327 }
2328
2329 if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
2330 tx_stop(info);
2331 return;
2332 }
2333
2334 if ( info->tx_count )
2335 tx_load_fifo( info );
2336 else {
2337 info->tx_active = false;
2338 info->ie0_value &= ~TXRDYE;
2339 write_reg(info, IE0, info->ie0_value);
2340 }
2341
2342 if (info->tx_count < WAKEUP_CHARS)
2343 info->pending_bh |= BH_TRANSMIT;
2344 }
2345
2346 static void isr_rxdmaok(SLMP_INFO * info)
2347 {
2348 /* BIT7 = EOT (end of transfer)
2349 * BIT6 = EOM (end of message/frame)
2350 */
2351 unsigned char status = read_reg(info,RXDMA + DSR) & 0xc0;
2352
2353 /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2354 write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
2355
2356 if ( debug_level >= DEBUG_LEVEL_ISR )
2357 printk("%s(%d):%s isr_rxdmaok(), status=%02x\n",
2358 __FILE__,__LINE__,info->device_name,status);
2359
2360 info->pending_bh |= BH_RECEIVE;
2361 }
2362
2363 static void isr_rxdmaerror(SLMP_INFO * info)
2364 {
2365 /* BIT5 = BOF (buffer overflow)
2366 * BIT4 = COF (counter overflow)
2367 */
2368 unsigned char status = read_reg(info,RXDMA + DSR) & 0x30;
2369
2370 /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2371 write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
2372
2373 if ( debug_level >= DEBUG_LEVEL_ISR )
2374 printk("%s(%d):%s isr_rxdmaerror(), status=%02x\n",
2375 __FILE__,__LINE__,info->device_name,status);
2376
2377 info->rx_overflow = true;
2378 info->pending_bh |= BH_RECEIVE;
2379 }
2380
2381 static void isr_txdmaok(SLMP_INFO * info)
2382 {
2383 unsigned char status_reg1 = read_reg(info, SR1);
2384
2385 write_reg(info, TXDMA + DIR, 0x00); /* disable Tx DMA IRQs */
2386 write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
2387 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2388
2389 if ( debug_level >= DEBUG_LEVEL_ISR )
2390 printk("%s(%d):%s isr_txdmaok(), status=%02x\n",
2391 __FILE__,__LINE__,info->device_name,status_reg1);
2392
2393 /* program TXRDY as FIFO empty flag, enable TXRDY IRQ */
2394 write_reg16(info, TRC0, 0);
2395 info->ie0_value |= TXRDYE;
2396 write_reg(info, IE0, info->ie0_value);
2397 }
2398
2399 static void isr_txdmaerror(SLMP_INFO * info)
2400 {
2401 /* BIT5 = BOF (buffer overflow)
2402 * BIT4 = COF (counter overflow)
2403 */
2404 unsigned char status = read_reg(info,TXDMA + DSR) & 0x30;
2405
2406 /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2407 write_reg(info, TXDMA + DSR, (unsigned char)(status | 1));
2408
2409 if ( debug_level >= DEBUG_LEVEL_ISR )
2410 printk("%s(%d):%s isr_txdmaerror(), status=%02x\n",
2411 __FILE__,__LINE__,info->device_name,status);
2412 }
2413
2414 /* handle input serial signal changes
2415 */
2416 static void isr_io_pin( SLMP_INFO *info, u16 status )
2417 {
2418 struct mgsl_icount *icount;
2419
2420 if ( debug_level >= DEBUG_LEVEL_ISR )
2421 printk("%s(%d):isr_io_pin status=%04X\n",
2422 __FILE__,__LINE__,status);
2423
2424 if (status & (MISCSTATUS_CTS_LATCHED | MISCSTATUS_DCD_LATCHED |
2425 MISCSTATUS_DSR_LATCHED | MISCSTATUS_RI_LATCHED) ) {
2426 icount = &info->icount;
2427 /* update input line counters */
2428 if (status & MISCSTATUS_RI_LATCHED) {
2429 icount->rng++;
2430 if ( status & SerialSignal_RI )
2431 info->input_signal_events.ri_up++;
2432 else
2433 info->input_signal_events.ri_down++;
2434 }
2435 if (status & MISCSTATUS_DSR_LATCHED) {
2436 icount->dsr++;
2437 if ( status & SerialSignal_DSR )
2438 info->input_signal_events.dsr_up++;
2439 else
2440 info->input_signal_events.dsr_down++;
2441 }
2442 if (status & MISCSTATUS_DCD_LATCHED) {
2443 if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
2444 info->ie1_value &= ~CDCD;
2445 write_reg(info, IE1, info->ie1_value);
2446 }
2447 icount->dcd++;
2448 if (status & SerialSignal_DCD) {
2449 info->input_signal_events.dcd_up++;
2450 } else
2451 info->input_signal_events.dcd_down++;
2452 #if SYNCLINK_GENERIC_HDLC
2453 if (info->netcount) {
2454 if (status & SerialSignal_DCD)
2455 netif_carrier_on(info->netdev);
2456 else
2457 netif_carrier_off(info->netdev);
2458 }
2459 #endif
2460 }
2461 if (status & MISCSTATUS_CTS_LATCHED)
2462 {
2463 if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
2464 info->ie1_value &= ~CCTS;
2465 write_reg(info, IE1, info->ie1_value);
2466 }
2467 icount->cts++;
2468 if ( status & SerialSignal_CTS )
2469 info->input_signal_events.cts_up++;
2470 else
2471 info->input_signal_events.cts_down++;
2472 }
2473 wake_up_interruptible(&info->status_event_wait_q);
2474 wake_up_interruptible(&info->event_wait_q);
2475
2476 if ( (info->port.flags & ASYNC_CHECK_CD) &&
2477 (status & MISCSTATUS_DCD_LATCHED) ) {
2478 if ( debug_level >= DEBUG_LEVEL_ISR )
2479 printk("%s CD now %s...", info->device_name,
2480 (status & SerialSignal_DCD) ? "on" : "off");
2481 if (status & SerialSignal_DCD)
2482 wake_up_interruptible(&info->port.open_wait);
2483 else {
2484 if ( debug_level >= DEBUG_LEVEL_ISR )
2485 printk("doing serial hangup...");
2486 if (info->port.tty)
2487 tty_hangup(info->port.tty);
2488 }
2489 }
2490
2491 if (tty_port_cts_enabled(&info->port) &&
2492 (status & MISCSTATUS_CTS_LATCHED) ) {
2493 if ( info->port.tty ) {
2494 if (info->port.tty->hw_stopped) {
2495 if (status & SerialSignal_CTS) {
2496 if ( debug_level >= DEBUG_LEVEL_ISR )
2497 printk("CTS tx start...");
2498 info->port.tty->hw_stopped = 0;
2499 tx_start(info);
2500 info->pending_bh |= BH_TRANSMIT;
2501 return;
2502 }
2503 } else {
2504 if (!(status & SerialSignal_CTS)) {
2505 if ( debug_level >= DEBUG_LEVEL_ISR )
2506 printk("CTS tx stop...");
2507 info->port.tty->hw_stopped = 1;
2508 tx_stop(info);
2509 }
2510 }
2511 }
2512 }
2513 }
2514
2515 info->pending_bh |= BH_STATUS;
2516 }
2517
2518 /* Interrupt service routine entry point.
2519 *
2520 * Arguments:
2521 * irq interrupt number that caused interrupt
2522 * dev_id device ID supplied during interrupt registration
2523 * regs interrupted processor context
2524 */
2525 static irqreturn_t synclinkmp_interrupt(int dummy, void *dev_id)
2526 {
2527 SLMP_INFO *info = dev_id;
2528 unsigned char status, status0, status1=0;
2529 unsigned char dmastatus, dmastatus0, dmastatus1=0;
2530 unsigned char timerstatus0, timerstatus1=0;
2531 unsigned char shift;
2532 unsigned int i;
2533 unsigned short tmp;
2534
2535 if ( debug_level >= DEBUG_LEVEL_ISR )
2536 printk(KERN_DEBUG "%s(%d): synclinkmp_interrupt(%d)entry.\n",
2537 __FILE__, __LINE__, info->irq_level);
2538
2539 spin_lock(&info->lock);
2540
2541 for(;;) {
2542
2543 /* get status for SCA0 (ports 0-1) */
2544 tmp = read_reg16(info, ISR0); /* get ISR0 and ISR1 in one read */
2545 status0 = (unsigned char)tmp;
2546 dmastatus0 = (unsigned char)(tmp>>8);
2547 timerstatus0 = read_reg(info, ISR2);
2548
2549 if ( debug_level >= DEBUG_LEVEL_ISR )
2550 printk(KERN_DEBUG "%s(%d):%s status0=%02x, dmastatus0=%02x, timerstatus0=%02x\n",
2551 __FILE__, __LINE__, info->device_name,
2552 status0, dmastatus0, timerstatus0);
2553
2554 if (info->port_count == 4) {
2555 /* get status for SCA1 (ports 2-3) */
2556 tmp = read_reg16(info->port_array[2], ISR0);
2557 status1 = (unsigned char)tmp;
2558 dmastatus1 = (unsigned char)(tmp>>8);
2559 timerstatus1 = read_reg(info->port_array[2], ISR2);
2560
2561 if ( debug_level >= DEBUG_LEVEL_ISR )
2562 printk("%s(%d):%s status1=%02x, dmastatus1=%02x, timerstatus1=%02x\n",
2563 __FILE__,__LINE__,info->device_name,
2564 status1,dmastatus1,timerstatus1);
2565 }
2566
2567 if (!status0 && !dmastatus0 && !timerstatus0 &&
2568 !status1 && !dmastatus1 && !timerstatus1)
2569 break;
2570
2571 for(i=0; i < info->port_count ; i++) {
2572 if (info->port_array[i] == NULL)
2573 continue;
2574 if (i < 2) {
2575 status = status0;
2576 dmastatus = dmastatus0;
2577 } else {
2578 status = status1;
2579 dmastatus = dmastatus1;
2580 }
2581
2582 shift = i & 1 ? 4 :0;
2583
2584 if (status & BIT0 << shift)
2585 isr_rxrdy(info->port_array[i]);
2586 if (status & BIT1 << shift)
2587 isr_txrdy(info->port_array[i]);
2588 if (status & BIT2 << shift)
2589 isr_rxint(info->port_array[i]);
2590 if (status & BIT3 << shift)
2591 isr_txint(info->port_array[i]);
2592
2593 if (dmastatus & BIT0 << shift)
2594 isr_rxdmaerror(info->port_array[i]);
2595 if (dmastatus & BIT1 << shift)
2596 isr_rxdmaok(info->port_array[i]);
2597 if (dmastatus & BIT2 << shift)
2598 isr_txdmaerror(info->port_array[i]);
2599 if (dmastatus & BIT3 << shift)
2600 isr_txdmaok(info->port_array[i]);
2601 }
2602
2603 if (timerstatus0 & (BIT5 | BIT4))
2604 isr_timer(info->port_array[0]);
2605 if (timerstatus0 & (BIT7 | BIT6))
2606 isr_timer(info->port_array[1]);
2607 if (timerstatus1 & (BIT5 | BIT4))
2608 isr_timer(info->port_array[2]);
2609 if (timerstatus1 & (BIT7 | BIT6))
2610 isr_timer(info->port_array[3]);
2611 }
2612
2613 for(i=0; i < info->port_count ; i++) {
2614 SLMP_INFO * port = info->port_array[i];
2615
2616 /* Request bottom half processing if there's something
2617 * for it to do and the bh is not already running.
2618 *
2619 * Note: startup adapter diags require interrupts.
2620 * do not request bottom half processing if the
2621 * device is not open in a normal mode.
2622 */
2623 if ( port && (port->port.count || port->netcount) &&
2624 port->pending_bh && !port->bh_running &&
2625 !port->bh_requested ) {
2626 if ( debug_level >= DEBUG_LEVEL_ISR )
2627 printk("%s(%d):%s queueing bh task.\n",
2628 __FILE__,__LINE__,port->device_name);
2629 schedule_work(&port->task);
2630 port->bh_requested = true;
2631 }
2632 }
2633
2634 spin_unlock(&info->lock);
2635
2636 if ( debug_level >= DEBUG_LEVEL_ISR )
2637 printk(KERN_DEBUG "%s(%d):synclinkmp_interrupt(%d)exit.\n",
2638 __FILE__, __LINE__, info->irq_level);
2639 return IRQ_HANDLED;
2640 }
2641
2642 /* Initialize and start device.
2643 */
2644 static int startup(SLMP_INFO * info)
2645 {
2646 if ( debug_level >= DEBUG_LEVEL_INFO )
2647 printk("%s(%d):%s tx_releaseup()\n",__FILE__,__LINE__,info->device_name);
2648
2649 if (info->port.flags & ASYNC_INITIALIZED)
2650 return 0;
2651
2652 if (!info->tx_buf) {
2653 info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
2654 if (!info->tx_buf) {
2655 printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
2656 __FILE__,__LINE__,info->device_name);
2657 return -ENOMEM;
2658 }
2659 }
2660
2661 info->pending_bh = 0;
2662
2663 memset(&info->icount, 0, sizeof(info->icount));
2664
2665 /* program hardware for current parameters */
2666 reset_port(info);
2667
2668 change_params(info);
2669
2670 mod_timer(&info->status_timer, jiffies + msecs_to_jiffies(10));
2671
2672 if (info->port.tty)
2673 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
2674
2675 info->port.flags |= ASYNC_INITIALIZED;
2676
2677 return 0;
2678 }
2679
2680 /* Called by close() and hangup() to shutdown hardware
2681 */
2682 static void shutdown(SLMP_INFO * info)
2683 {
2684 unsigned long flags;
2685
2686 if (!(info->port.flags & ASYNC_INITIALIZED))
2687 return;
2688
2689 if (debug_level >= DEBUG_LEVEL_INFO)
2690 printk("%s(%d):%s synclinkmp_shutdown()\n",
2691 __FILE__,__LINE__, info->device_name );
2692
2693 /* clear status wait queue because status changes */
2694 /* can't happen after shutting down the hardware */
2695 wake_up_interruptible(&info->status_event_wait_q);
2696 wake_up_interruptible(&info->event_wait_q);
2697
2698 del_timer(&info->tx_timer);
2699 del_timer(&info->status_timer);
2700
2701 kfree(info->tx_buf);
2702 info->tx_buf = NULL;
2703
2704 spin_lock_irqsave(&info->lock,flags);
2705
2706 reset_port(info);
2707
2708 if (!info->port.tty || info->port.tty->termios.c_cflag & HUPCL) {
2709 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
2710 set_signals(info);
2711 }
2712
2713 spin_unlock_irqrestore(&info->lock,flags);
2714
2715 if (info->port.tty)
2716 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
2717
2718 info->port.flags &= ~ASYNC_INITIALIZED;
2719 }
2720
2721 static void program_hw(SLMP_INFO *info)
2722 {
2723 unsigned long flags;
2724
2725 spin_lock_irqsave(&info->lock,flags);
2726
2727 rx_stop(info);
2728 tx_stop(info);
2729
2730 info->tx_count = info->tx_put = info->tx_get = 0;
2731
2732 if (info->params.mode == MGSL_MODE_HDLC || info->netcount)
2733 hdlc_mode(info);
2734 else
2735 async_mode(info);
2736
2737 set_signals(info);
2738
2739 info->dcd_chkcount = 0;
2740 info->cts_chkcount = 0;
2741 info->ri_chkcount = 0;
2742 info->dsr_chkcount = 0;
2743
2744 info->ie1_value |= (CDCD|CCTS);
2745 write_reg(info, IE1, info->ie1_value);
2746
2747 get_signals(info);
2748
2749 if (info->netcount || (info->port.tty && info->port.tty->termios.c_cflag & CREAD) )
2750 rx_start(info);
2751
2752 spin_unlock_irqrestore(&info->lock,flags);
2753 }
2754
2755 /* Reconfigure adapter based on new parameters
2756 */
2757 static void change_params(SLMP_INFO *info)
2758 {
2759 unsigned cflag;
2760 int bits_per_char;
2761
2762 if (!info->port.tty)
2763 return;
2764
2765 if (debug_level >= DEBUG_LEVEL_INFO)
2766 printk("%s(%d):%s change_params()\n",
2767 __FILE__,__LINE__, info->device_name );
2768
2769 cflag = info->port.tty->termios.c_cflag;
2770
2771 /* if B0 rate (hangup) specified then negate RTS and DTR */
2772 /* otherwise assert RTS and DTR */
2773 if (cflag & CBAUD)
2774 info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
2775 else
2776 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
2777
2778 /* byte size and parity */
2779
2780 switch (cflag & CSIZE) {
2781 case CS5: info->params.data_bits = 5; break;
2782 case CS6: info->params.data_bits = 6; break;
2783 case CS7: info->params.data_bits = 7; break;
2784 case CS8: info->params.data_bits = 8; break;
2785 /* Never happens, but GCC is too dumb to figure it out */
2786 default: info->params.data_bits = 7; break;
2787 }
2788
2789 if (cflag & CSTOPB)
2790 info->params.stop_bits = 2;
2791 else
2792 info->params.stop_bits = 1;
2793
2794 info->params.parity = ASYNC_PARITY_NONE;
2795 if (cflag & PARENB) {
2796 if (cflag & PARODD)
2797 info->params.parity = ASYNC_PARITY_ODD;
2798 else
2799 info->params.parity = ASYNC_PARITY_EVEN;
2800 #ifdef CMSPAR
2801 if (cflag & CMSPAR)
2802 info->params.parity = ASYNC_PARITY_SPACE;
2803 #endif
2804 }
2805
2806 /* calculate number of jiffies to transmit a full
2807 * FIFO (32 bytes) at specified data rate
2808 */
2809 bits_per_char = info->params.data_bits +
2810 info->params.stop_bits + 1;
2811
2812 /* if port data rate is set to 460800 or less then
2813 * allow tty settings to override, otherwise keep the
2814 * current data rate.
2815 */
2816 if (info->params.data_rate <= 460800) {
2817 info->params.data_rate = tty_get_baud_rate(info->port.tty);
2818 }
2819
2820 if ( info->params.data_rate ) {
2821 info->timeout = (32*HZ*bits_per_char) /
2822 info->params.data_rate;
2823 }
2824 info->timeout += HZ/50; /* Add .02 seconds of slop */
2825
2826 if (cflag & CRTSCTS)
2827 info->port.flags |= ASYNC_CTS_FLOW;
2828 else
2829 info->port.flags &= ~ASYNC_CTS_FLOW;
2830
2831 if (cflag & CLOCAL)
2832 info->port.flags &= ~ASYNC_CHECK_CD;
2833 else
2834 info->port.flags |= ASYNC_CHECK_CD;
2835
2836 /* process tty input control flags */
2837
2838 info->read_status_mask2 = OVRN;
2839 if (I_INPCK(info->port.tty))
2840 info->read_status_mask2 |= PE | FRME;
2841 if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
2842 info->read_status_mask1 |= BRKD;
2843 if (I_IGNPAR(info->port.tty))
2844 info->ignore_status_mask2 |= PE | FRME;
2845 if (I_IGNBRK(info->port.tty)) {
2846 info->ignore_status_mask1 |= BRKD;
2847 /* If ignoring parity and break indicators, ignore
2848 * overruns too. (For real raw support).
2849 */
2850 if (I_IGNPAR(info->port.tty))
2851 info->ignore_status_mask2 |= OVRN;
2852 }
2853
2854 program_hw(info);
2855 }
2856
2857 static int get_stats(SLMP_INFO * info, struct mgsl_icount __user *user_icount)
2858 {
2859 int err;
2860
2861 if (debug_level >= DEBUG_LEVEL_INFO)
2862 printk("%s(%d):%s get_params()\n",
2863 __FILE__,__LINE__, info->device_name);
2864
2865 if (!user_icount) {
2866 memset(&info->icount, 0, sizeof(info->icount));
2867 } else {
2868 mutex_lock(&info->port.mutex);
2869 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
2870 mutex_unlock(&info->port.mutex);
2871 if (err)
2872 return -EFAULT;
2873 }
2874
2875 return 0;
2876 }
2877
2878 static int get_params(SLMP_INFO * info, MGSL_PARAMS __user *user_params)
2879 {
2880 int err;
2881 if (debug_level >= DEBUG_LEVEL_INFO)
2882 printk("%s(%d):%s get_params()\n",
2883 __FILE__,__LINE__, info->device_name);
2884
2885 mutex_lock(&info->port.mutex);
2886 COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
2887 mutex_unlock(&info->port.mutex);
2888 if (err) {
2889 if ( debug_level >= DEBUG_LEVEL_INFO )
2890 printk( "%s(%d):%s get_params() user buffer copy failed\n",
2891 __FILE__,__LINE__,info->device_name);
2892 return -EFAULT;
2893 }
2894
2895 return 0;
2896 }
2897
2898 static int set_params(SLMP_INFO * info, MGSL_PARAMS __user *new_params)
2899 {
2900 unsigned long flags;
2901 MGSL_PARAMS tmp_params;
2902 int err;
2903
2904 if (debug_level >= DEBUG_LEVEL_INFO)
2905 printk("%s(%d):%s set_params\n",
2906 __FILE__,__LINE__,info->device_name );
2907 COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
2908 if (err) {
2909 if ( debug_level >= DEBUG_LEVEL_INFO )
2910 printk( "%s(%d):%s set_params() user buffer copy failed\n",
2911 __FILE__,__LINE__,info->device_name);
2912 return -EFAULT;
2913 }
2914
2915 mutex_lock(&info->port.mutex);
2916 spin_lock_irqsave(&info->lock,flags);
2917 memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
2918 spin_unlock_irqrestore(&info->lock,flags);
2919
2920 change_params(info);
2921 mutex_unlock(&info->port.mutex);
2922
2923 return 0;
2924 }
2925
2926 static int get_txidle(SLMP_INFO * info, int __user *idle_mode)
2927 {
2928 int err;
2929
2930 if (debug_level >= DEBUG_LEVEL_INFO)
2931 printk("%s(%d):%s get_txidle()=%d\n",
2932 __FILE__,__LINE__, info->device_name, info->idle_mode);
2933
2934 COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
2935 if (err) {
2936 if ( debug_level >= DEBUG_LEVEL_INFO )
2937 printk( "%s(%d):%s get_txidle() user buffer copy failed\n",
2938 __FILE__,__LINE__,info->device_name);
2939 return -EFAULT;
2940 }
2941
2942 return 0;
2943 }
2944
2945 static int set_txidle(SLMP_INFO * info, int idle_mode)
2946 {
2947 unsigned long flags;
2948
2949 if (debug_level >= DEBUG_LEVEL_INFO)
2950 printk("%s(%d):%s set_txidle(%d)\n",
2951 __FILE__,__LINE__,info->device_name, idle_mode );
2952
2953 spin_lock_irqsave(&info->lock,flags);
2954 info->idle_mode = idle_mode;
2955 tx_set_idle( info );
2956 spin_unlock_irqrestore(&info->lock,flags);
2957 return 0;
2958 }
2959
2960 static int tx_enable(SLMP_INFO * info, int enable)
2961 {
2962 unsigned long flags;
2963
2964 if (debug_level >= DEBUG_LEVEL_INFO)
2965 printk("%s(%d):%s tx_enable(%d)\n",
2966 __FILE__,__LINE__,info->device_name, enable);
2967
2968 spin_lock_irqsave(&info->lock,flags);
2969 if ( enable ) {
2970 if ( !info->tx_enabled ) {
2971 tx_start(info);
2972 }
2973 } else {
2974 if ( info->tx_enabled )
2975 tx_stop(info);
2976 }
2977 spin_unlock_irqrestore(&info->lock,flags);
2978 return 0;
2979 }
2980
2981 /* abort send HDLC frame
2982 */
2983 static int tx_abort(SLMP_INFO * info)
2984 {
2985 unsigned long flags;
2986
2987 if (debug_level >= DEBUG_LEVEL_INFO)
2988 printk("%s(%d):%s tx_abort()\n",
2989 __FILE__,__LINE__,info->device_name);
2990
2991 spin_lock_irqsave(&info->lock,flags);
2992 if ( info->tx_active && info->params.mode == MGSL_MODE_HDLC ) {
2993 info->ie1_value &= ~UDRN;
2994 info->ie1_value |= IDLE;
2995 write_reg(info, IE1, info->ie1_value); /* disable tx status interrupts */
2996 write_reg(info, SR1, (unsigned char)(IDLE + UDRN)); /* clear pending */
2997
2998 write_reg(info, TXDMA + DSR, 0); /* disable DMA channel */
2999 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
3000
3001 write_reg(info, CMD, TXABORT);
3002 }
3003 spin_unlock_irqrestore(&info->lock,flags);
3004 return 0;
3005 }
3006
3007 static int rx_enable(SLMP_INFO * info, int enable)
3008 {
3009 unsigned long flags;
3010
3011 if (debug_level >= DEBUG_LEVEL_INFO)
3012 printk("%s(%d):%s rx_enable(%d)\n",
3013 __FILE__,__LINE__,info->device_name,enable);
3014
3015 spin_lock_irqsave(&info->lock,flags);
3016 if ( enable ) {
3017 if ( !info->rx_enabled )
3018 rx_start(info);
3019 } else {
3020 if ( info->rx_enabled )
3021 rx_stop(info);
3022 }
3023 spin_unlock_irqrestore(&info->lock,flags);
3024 return 0;
3025 }
3026
3027 /* wait for specified event to occur
3028 */
3029 static int wait_mgsl_event(SLMP_INFO * info, int __user *mask_ptr)
3030 {
3031 unsigned long flags;
3032 int s;
3033 int rc=0;
3034 struct mgsl_icount cprev, cnow;
3035 int events;
3036 int mask;
3037 struct _input_signal_events oldsigs, newsigs;
3038 DECLARE_WAITQUEUE(wait, current);
3039
3040 COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
3041 if (rc) {
3042 return -EFAULT;
3043 }
3044
3045 if (debug_level >= DEBUG_LEVEL_INFO)
3046 printk("%s(%d):%s wait_mgsl_event(%d)\n",
3047 __FILE__,__LINE__,info->device_name,mask);
3048
3049 spin_lock_irqsave(&info->lock,flags);
3050
3051 /* return immediately if state matches requested events */
3052 get_signals(info);
3053 s = info->serial_signals;
3054
3055 events = mask &
3056 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
3057 ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
3058 ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
3059 ((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) );
3060 if (events) {
3061 spin_unlock_irqrestore(&info->lock,flags);
3062 goto exit;
3063 }
3064
3065 /* save current irq counts */
3066 cprev = info->icount;
3067 oldsigs = info->input_signal_events;
3068
3069 /* enable hunt and idle irqs if needed */
3070 if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
3071 unsigned char oldval = info->ie1_value;
3072 unsigned char newval = oldval +
3073 (mask & MgslEvent_ExitHuntMode ? FLGD:0) +
3074 (mask & MgslEvent_IdleReceived ? IDLD:0);
3075 if ( oldval != newval ) {
3076 info->ie1_value = newval;
3077 write_reg(info, IE1, info->ie1_value);
3078 }
3079 }
3080
3081 set_current_state(TASK_INTERRUPTIBLE);
3082 add_wait_queue(&info->event_wait_q, &wait);
3083
3084 spin_unlock_irqrestore(&info->lock,flags);
3085
3086 for(;;) {
3087 schedule();
3088 if (signal_pending(current)) {
3089 rc = -ERESTARTSYS;
3090 break;
3091 }
3092
3093 /* get current irq counts */
3094 spin_lock_irqsave(&info->lock,flags);
3095 cnow = info->icount;
3096 newsigs = info->input_signal_events;
3097 set_current_state(TASK_INTERRUPTIBLE);
3098 spin_unlock_irqrestore(&info->lock,flags);
3099
3100 /* if no change, wait aborted for some reason */
3101 if (newsigs.dsr_up == oldsigs.dsr_up &&
3102 newsigs.dsr_down == oldsigs.dsr_down &&
3103 newsigs.dcd_up == oldsigs.dcd_up &&
3104 newsigs.dcd_down == oldsigs.dcd_down &&
3105 newsigs.cts_up == oldsigs.cts_up &&
3106 newsigs.cts_down == oldsigs.cts_down &&
3107 newsigs.ri_up == oldsigs.ri_up &&
3108 newsigs.ri_down == oldsigs.ri_down &&
3109 cnow.exithunt == cprev.exithunt &&
3110 cnow.rxidle == cprev.rxidle) {
3111 rc = -EIO;
3112 break;
3113 }
3114
3115 events = mask &
3116 ( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) +
3117 (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
3118 (newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) +
3119 (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
3120 (newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) +
3121 (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
3122 (newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) +
3123 (newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) +
3124 (cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) +
3125 (cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) );
3126 if (events)
3127 break;
3128
3129 cprev = cnow;
3130 oldsigs = newsigs;
3131 }
3132
3133 remove_wait_queue(&info->event_wait_q, &wait);
3134 set_current_state(TASK_RUNNING);
3135
3136
3137 if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
3138 spin_lock_irqsave(&info->lock,flags);
3139 if (!waitqueue_active(&info->event_wait_q)) {
3140 /* disable enable exit hunt mode/idle rcvd IRQs */
3141 info->ie1_value &= ~(FLGD|IDLD);
3142 write_reg(info, IE1, info->ie1_value);
3143 }
3144 spin_unlock_irqrestore(&info->lock,flags);
3145 }
3146 exit:
3147 if ( rc == 0 )
3148 PUT_USER(rc, events, mask_ptr);
3149
3150 return rc;
3151 }
3152
3153 static int modem_input_wait(SLMP_INFO *info,int arg)
3154 {
3155 unsigned long flags;
3156 int rc;
3157 struct mgsl_icount cprev, cnow;
3158 DECLARE_WAITQUEUE(wait, current);
3159
3160 /* save current irq counts */
3161 spin_lock_irqsave(&info->lock,flags);
3162 cprev = info->icount;
3163 add_wait_queue(&info->status_event_wait_q, &wait);
3164 set_current_state(TASK_INTERRUPTIBLE);
3165 spin_unlock_irqrestore(&info->lock,flags);
3166
3167 for(;;) {
3168 schedule();
3169 if (signal_pending(current)) {
3170 rc = -ERESTARTSYS;
3171 break;
3172 }
3173
3174 /* get new irq counts */
3175 spin_lock_irqsave(&info->lock,flags);
3176 cnow = info->icount;
3177 set_current_state(TASK_INTERRUPTIBLE);
3178 spin_unlock_irqrestore(&info->lock,flags);
3179
3180 /* if no change, wait aborted for some reason */
3181 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
3182 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
3183 rc = -EIO;
3184 break;
3185 }
3186
3187 /* check for change in caller specified modem input */
3188 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
3189 (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
3190 (arg & TIOCM_CD && cnow.dcd != cprev.dcd) ||
3191 (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
3192 rc = 0;
3193 break;
3194 }
3195
3196 cprev = cnow;
3197 }
3198 remove_wait_queue(&info->status_event_wait_q, &wait);
3199 set_current_state(TASK_RUNNING);
3200 return rc;
3201 }
3202
3203 /* return the state of the serial control and status signals
3204 */
3205 static int tiocmget(struct tty_struct *tty)
3206 {
3207 SLMP_INFO *info = tty->driver_data;
3208 unsigned int result;
3209 unsigned long flags;
3210
3211 spin_lock_irqsave(&info->lock,flags);
3212 get_signals(info);
3213 spin_unlock_irqrestore(&info->lock,flags);
3214
3215 result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS : 0) |
3216 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR : 0) |
3217 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR : 0) |
3218 ((info->serial_signals & SerialSignal_RI) ? TIOCM_RNG : 0) |
3219 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR : 0) |
3220 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS : 0);
3221
3222 if (debug_level >= DEBUG_LEVEL_INFO)
3223 printk("%s(%d):%s tiocmget() value=%08X\n",
3224 __FILE__,__LINE__, info->device_name, result );
3225 return result;
3226 }
3227
3228 /* set modem control signals (DTR/RTS)
3229 */
3230 static int tiocmset(struct tty_struct *tty,
3231 unsigned int set, unsigned int clear)
3232 {
3233 SLMP_INFO *info = tty->driver_data;
3234 unsigned long flags;
3235
3236 if (debug_level >= DEBUG_LEVEL_INFO)
3237 printk("%s(%d):%s tiocmset(%x,%x)\n",
3238 __FILE__,__LINE__,info->device_name, set, clear);
3239
3240 if (set & TIOCM_RTS)
3241 info->serial_signals |= SerialSignal_RTS;
3242 if (set & TIOCM_DTR)
3243 info->serial_signals |= SerialSignal_DTR;
3244 if (clear & TIOCM_RTS)
3245 info->serial_signals &= ~SerialSignal_RTS;
3246 if (clear & TIOCM_DTR)
3247 info->serial_signals &= ~SerialSignal_DTR;
3248
3249 spin_lock_irqsave(&info->lock,flags);
3250 set_signals(info);
3251 spin_unlock_irqrestore(&info->lock,flags);
3252
3253 return 0;
3254 }
3255
3256 static int carrier_raised(struct tty_port *port)
3257 {
3258 SLMP_INFO *info = container_of(port, SLMP_INFO, port);
3259 unsigned long flags;
3260
3261 spin_lock_irqsave(&info->lock,flags);
3262 get_signals(info);
3263 spin_unlock_irqrestore(&info->lock,flags);
3264
3265 return (info->serial_signals & SerialSignal_DCD) ? 1 : 0;
3266 }
3267
3268 static void dtr_rts(struct tty_port *port, int on)
3269 {
3270 SLMP_INFO *info = container_of(port, SLMP_INFO, port);
3271 unsigned long flags;
3272
3273 spin_lock_irqsave(&info->lock,flags);
3274 if (on)
3275 info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
3276 else
3277 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
3278 set_signals(info);
3279 spin_unlock_irqrestore(&info->lock,flags);
3280 }
3281
3282 /* Block the current process until the specified port is ready to open.
3283 */
3284 static int block_til_ready(struct tty_struct *tty, struct file *filp,
3285 SLMP_INFO *info)
3286 {
3287 DECLARE_WAITQUEUE(wait, current);
3288 int retval;
3289 bool do_clocal = false;
3290 bool extra_count = false;
3291 unsigned long flags;
3292 int cd;
3293 struct tty_port *port = &info->port;
3294
3295 if (debug_level >= DEBUG_LEVEL_INFO)
3296 printk("%s(%d):%s block_til_ready()\n",
3297 __FILE__,__LINE__, tty->driver->name );
3298
3299 if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
3300 /* nonblock mode is set or port is not enabled */
3301 /* just verify that callout device is not active */
3302 port->flags |= ASYNC_NORMAL_ACTIVE;
3303 return 0;
3304 }
3305
3306 if (tty->termios.c_cflag & CLOCAL)
3307 do_clocal = true;
3308
3309 /* Wait for carrier detect and the line to become
3310 * free (i.e., not in use by the callout). While we are in
3311 * this loop, port->count is dropped by one, so that
3312 * close() knows when to free things. We restore it upon
3313 * exit, either normal or abnormal.
3314 */
3315
3316 retval = 0;
3317 add_wait_queue(&port->open_wait, &wait);
3318
3319 if (debug_level >= DEBUG_LEVEL_INFO)
3320 printk("%s(%d):%s block_til_ready() before block, count=%d\n",
3321 __FILE__,__LINE__, tty->driver->name, port->count );
3322
3323 spin_lock_irqsave(&info->lock, flags);
3324 if (!tty_hung_up_p(filp)) {
3325 extra_count = true;
3326 port->count--;
3327 }
3328 spin_unlock_irqrestore(&info->lock, flags);
3329 port->blocked_open++;
3330
3331 while (1) {
3332 if (C_BAUD(tty) && test_bit(ASYNCB_INITIALIZED, &port->flags))
3333 tty_port_raise_dtr_rts(port);
3334
3335 set_current_state(TASK_INTERRUPTIBLE);
3336
3337 if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)){
3338 retval = (port->flags & ASYNC_HUP_NOTIFY) ?
3339 -EAGAIN : -ERESTARTSYS;
3340 break;
3341 }
3342
3343 cd = tty_port_carrier_raised(port);
3344
3345 if (!(port->flags & ASYNC_CLOSING) && (do_clocal || cd))
3346 break;
3347
3348 if (signal_pending(current)) {
3349 retval = -ERESTARTSYS;
3350 break;
3351 }
3352
3353 if (debug_level >= DEBUG_LEVEL_INFO)
3354 printk("%s(%d):%s block_til_ready() count=%d\n",
3355 __FILE__,__LINE__, tty->driver->name, port->count );
3356
3357 tty_unlock(tty);
3358 schedule();
3359 tty_lock(tty);
3360 }
3361
3362 set_current_state(TASK_RUNNING);
3363 remove_wait_queue(&port->open_wait, &wait);
3364
3365 if (extra_count)
3366 port->count++;
3367 port->blocked_open--;
3368
3369 if (debug_level >= DEBUG_LEVEL_INFO)
3370 printk("%s(%d):%s block_til_ready() after, count=%d\n",
3371 __FILE__,__LINE__, tty->driver->name, port->count );
3372
3373 if (!retval)
3374 port->flags |= ASYNC_NORMAL_ACTIVE;
3375
3376 return retval;
3377 }
3378
3379 static int alloc_dma_bufs(SLMP_INFO *info)
3380 {
3381 unsigned short BuffersPerFrame;
3382 unsigned short BufferCount;
3383
3384 // Force allocation to start at 64K boundary for each port.
3385 // This is necessary because *all* buffer descriptors for a port
3386 // *must* be in the same 64K block. All descriptors on a port
3387 // share a common 'base' address (upper 8 bits of 24 bits) programmed
3388 // into the CBP register.
3389 info->port_array[0]->last_mem_alloc = (SCA_MEM_SIZE/4) * info->port_num;
3390
3391 /* Calculate the number of DMA buffers necessary to hold the */
3392 /* largest allowable frame size. Note: If the max frame size is */
3393 /* not an even multiple of the DMA buffer size then we need to */
3394 /* round the buffer count per frame up one. */
3395
3396 BuffersPerFrame = (unsigned short)(info->max_frame_size/SCABUFSIZE);
3397 if ( info->max_frame_size % SCABUFSIZE )
3398 BuffersPerFrame++;
3399
3400 /* calculate total number of data buffers (SCABUFSIZE) possible
3401 * in one ports memory (SCA_MEM_SIZE/4) after allocating memory
3402 * for the descriptor list (BUFFERLISTSIZE).
3403 */
3404 BufferCount = (SCA_MEM_SIZE/4 - BUFFERLISTSIZE)/SCABUFSIZE;
3405
3406 /* limit number of buffers to maximum amount of descriptors */
3407 if (BufferCount > BUFFERLISTSIZE/sizeof(SCADESC))
3408 BufferCount = BUFFERLISTSIZE/sizeof(SCADESC);
3409
3410 /* use enough buffers to transmit one max size frame */
3411 info->tx_buf_count = BuffersPerFrame + 1;
3412
3413 /* never use more than half the available buffers for transmit */
3414 if (info->tx_buf_count > (BufferCount/2))
3415 info->tx_buf_count = BufferCount/2;
3416
3417 if (info->tx_buf_count > SCAMAXDESC)
3418 info->tx_buf_count = SCAMAXDESC;
3419
3420 /* use remaining buffers for receive */
3421 info->rx_buf_count = BufferCount - info->tx_buf_count;
3422
3423 if (info->rx_buf_count > SCAMAXDESC)
3424 info->rx_buf_count = SCAMAXDESC;
3425
3426 if ( debug_level >= DEBUG_LEVEL_INFO )
3427 printk("%s(%d):%s Allocating %d TX and %d RX DMA buffers.\n",
3428 __FILE__,__LINE__, info->device_name,
3429 info->tx_buf_count,info->rx_buf_count);
3430
3431 if ( alloc_buf_list( info ) < 0 ||
3432 alloc_frame_bufs(info,
3433 info->rx_buf_list,
3434 info->rx_buf_list_ex,
3435 info->rx_buf_count) < 0 ||
3436 alloc_frame_bufs(info,
3437 info->tx_buf_list,
3438 info->tx_buf_list_ex,
3439 info->tx_buf_count) < 0 ||
3440 alloc_tmp_rx_buf(info) < 0 ) {
3441 printk("%s(%d):%s Can't allocate DMA buffer memory\n",
3442 __FILE__,__LINE__, info->device_name);
3443 return -ENOMEM;
3444 }
3445
3446 rx_reset_buffers( info );
3447
3448 return 0;
3449 }
3450
3451 /* Allocate DMA buffers for the transmit and receive descriptor lists.
3452 */
3453 static int alloc_buf_list(SLMP_INFO *info)
3454 {
3455 unsigned int i;
3456
3457 /* build list in adapter shared memory */
3458 info->buffer_list = info->memory_base + info->port_array[0]->last_mem_alloc;
3459 info->buffer_list_phys = info->port_array[0]->last_mem_alloc;
3460 info->port_array[0]->last_mem_alloc += BUFFERLISTSIZE;
3461
3462 memset(info->buffer_list, 0, BUFFERLISTSIZE);
3463
3464 /* Save virtual address pointers to the receive and */
3465 /* transmit buffer lists. (Receive 1st). These pointers will */
3466 /* be used by the processor to access the lists. */
3467 info->rx_buf_list = (SCADESC *)info->buffer_list;
3468
3469 info->tx_buf_list = (SCADESC *)info->buffer_list;
3470 info->tx_buf_list += info->rx_buf_count;
3471
3472 /* Build links for circular buffer entry lists (tx and rx)
3473 *
3474 * Note: links are physical addresses read by the SCA device
3475 * to determine the next buffer entry to use.
3476 */
3477
3478 for ( i = 0; i < info->rx_buf_count; i++ ) {
3479 /* calculate and store physical address of this buffer entry */
3480 info->rx_buf_list_ex[i].phys_entry =
3481 info->buffer_list_phys + (i * SCABUFSIZE);
3482
3483 /* calculate and store physical address of */
3484 /* next entry in cirular list of entries */
3485 info->rx_buf_list[i].next = info->buffer_list_phys;
3486 if ( i < info->rx_buf_count - 1 )
3487 info->rx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
3488
3489 info->rx_buf_list[i].length = SCABUFSIZE;
3490 }
3491
3492 for ( i = 0; i < info->tx_buf_count; i++ ) {
3493 /* calculate and store physical address of this buffer entry */
3494 info->tx_buf_list_ex[i].phys_entry = info->buffer_list_phys +
3495 ((info->rx_buf_count + i) * sizeof(SCADESC));
3496
3497 /* calculate and store physical address of */
3498 /* next entry in cirular list of entries */
3499
3500 info->tx_buf_list[i].next = info->buffer_list_phys +
3501 info->rx_buf_count * sizeof(SCADESC);
3502
3503 if ( i < info->tx_buf_count - 1 )
3504 info->tx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
3505 }
3506
3507 return 0;
3508 }
3509
3510 /* Allocate the frame DMA buffers used by the specified buffer list.
3511 */
3512 static int alloc_frame_bufs(SLMP_INFO *info, SCADESC *buf_list,SCADESC_EX *buf_list_ex,int count)
3513 {
3514 int i;
3515 unsigned long phys_addr;
3516
3517 for ( i = 0; i < count; i++ ) {
3518 buf_list_ex[i].virt_addr = info->memory_base + info->port_array[0]->last_mem_alloc;
3519 phys_addr = info->port_array[0]->last_mem_alloc;
3520 info->port_array[0]->last_mem_alloc += SCABUFSIZE;
3521
3522 buf_list[i].buf_ptr = (unsigned short)phys_addr;
3523 buf_list[i].buf_base = (unsigned char)(phys_addr >> 16);
3524 }
3525
3526 return 0;
3527 }
3528
3529 static void free_dma_bufs(SLMP_INFO *info)
3530 {
3531 info->buffer_list = NULL;
3532 info->rx_buf_list = NULL;
3533 info->tx_buf_list = NULL;
3534 }
3535
3536 /* allocate buffer large enough to hold max_frame_size.
3537 * This buffer is used to pass an assembled frame to the line discipline.
3538 */
3539 static int alloc_tmp_rx_buf(SLMP_INFO *info)
3540 {
3541 info->tmp_rx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
3542 if (info->tmp_rx_buf == NULL)
3543 return -ENOMEM;
3544 /* unused flag buffer to satisfy receive_buf calling interface */
3545 info->flag_buf = kzalloc(info->max_frame_size, GFP_KERNEL);
3546 if (!info->flag_buf) {
3547 kfree(info->tmp_rx_buf);
3548 info->tmp_rx_buf = NULL;
3549 return -ENOMEM;
3550 }
3551 return 0;
3552 }
3553
3554 static void free_tmp_rx_buf(SLMP_INFO *info)
3555 {
3556 kfree(info->tmp_rx_buf);
3557 info->tmp_rx_buf = NULL;
3558 kfree(info->flag_buf);
3559 info->flag_buf = NULL;
3560 }
3561
3562 static int claim_resources(SLMP_INFO *info)
3563 {
3564 if (request_mem_region(info->phys_memory_base,SCA_MEM_SIZE,"synclinkmp") == NULL) {
3565 printk( "%s(%d):%s mem addr conflict, Addr=%08X\n",
3566 __FILE__,__LINE__,info->device_name, info->phys_memory_base);
3567 info->init_error = DiagStatus_AddressConflict;
3568 goto errout;
3569 }
3570 else
3571 info->shared_mem_requested = true;
3572
3573 if (request_mem_region(info->phys_lcr_base + info->lcr_offset,128,"synclinkmp") == NULL) {
3574 printk( "%s(%d):%s lcr mem addr conflict, Addr=%08X\n",
3575 __FILE__,__LINE__,info->device_name, info->phys_lcr_base);
3576 info->init_error = DiagStatus_AddressConflict;
3577 goto errout;
3578 }
3579 else
3580 info->lcr_mem_requested = true;
3581
3582 if (request_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE,"synclinkmp") == NULL) {
3583 printk( "%s(%d):%s sca mem addr conflict, Addr=%08X\n",
3584 __FILE__,__LINE__,info->device_name, info->phys_sca_base);
3585 info->init_error = DiagStatus_AddressConflict;
3586 goto errout;
3587 }
3588 else
3589 info->sca_base_requested = true;
3590
3591 if (request_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE,"synclinkmp") == NULL) {
3592 printk( "%s(%d):%s stat/ctrl mem addr conflict, Addr=%08X\n",
3593 __FILE__,__LINE__,info->device_name, info->phys_statctrl_base);
3594 info->init_error = DiagStatus_AddressConflict;
3595 goto errout;
3596 }
3597 else
3598 info->sca_statctrl_requested = true;
3599
3600 info->memory_base = ioremap_nocache(info->phys_memory_base,
3601 SCA_MEM_SIZE);
3602 if (!info->memory_base) {
3603 printk( "%s(%d):%s Can't map shared memory, MemAddr=%08X\n",
3604 __FILE__,__LINE__,info->device_name, info->phys_memory_base );
3605 info->init_error = DiagStatus_CantAssignPciResources;
3606 goto errout;
3607 }
3608
3609 info->lcr_base = ioremap_nocache(info->phys_lcr_base, PAGE_SIZE);
3610 if (!info->lcr_base) {
3611 printk( "%s(%d):%s Can't map LCR memory, MemAddr=%08X\n",
3612 __FILE__,__LINE__,info->device_name, info->phys_lcr_base );
3613 info->init_error = DiagStatus_CantAssignPciResources;
3614 goto errout;
3615 }
3616 info->lcr_base += info->lcr_offset;
3617
3618 info->sca_base = ioremap_nocache(info->phys_sca_base, PAGE_SIZE);
3619 if (!info->sca_base) {
3620 printk( "%s(%d):%s Can't map SCA memory, MemAddr=%08X\n",
3621 __FILE__,__LINE__,info->device_name, info->phys_sca_base );
3622 info->init_error = DiagStatus_CantAssignPciResources;
3623 goto errout;
3624 }
3625 info->sca_base += info->sca_offset;
3626
3627 info->statctrl_base = ioremap_nocache(info->phys_statctrl_base,
3628 PAGE_SIZE);
3629 if (!info->statctrl_base) {
3630 printk( "%s(%d):%s Can't map SCA Status/Control memory, MemAddr=%08X\n",
3631 __FILE__,__LINE__,info->device_name, info->phys_statctrl_base );
3632 info->init_error = DiagStatus_CantAssignPciResources;
3633 goto errout;
3634 }
3635 info->statctrl_base += info->statctrl_offset;
3636
3637 if ( !memory_test(info) ) {
3638 printk( "%s(%d):Shared Memory Test failed for device %s MemAddr=%08X\n",
3639 __FILE__,__LINE__,info->device_name, info->phys_memory_base );
3640 info->init_error = DiagStatus_MemoryError;
3641 goto errout;
3642 }
3643
3644 return 0;
3645
3646 errout:
3647 release_resources( info );
3648 return -ENODEV;
3649 }
3650
3651 static void release_resources(SLMP_INFO *info)
3652 {
3653 if ( debug_level >= DEBUG_LEVEL_INFO )
3654 printk( "%s(%d):%s release_resources() entry\n",
3655 __FILE__,__LINE__,info->device_name );
3656
3657 if ( info->irq_requested ) {
3658 free_irq(info->irq_level, info);
3659 info->irq_requested = false;
3660 }
3661
3662 if ( info->shared_mem_requested ) {
3663 release_mem_region(info->phys_memory_base,SCA_MEM_SIZE);
3664 info->shared_mem_requested = false;
3665 }
3666 if ( info->lcr_mem_requested ) {
3667 release_mem_region(info->phys_lcr_base + info->lcr_offset,128);
3668 info->lcr_mem_requested = false;
3669 }
3670 if ( info->sca_base_requested ) {
3671 release_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE);
3672 info->sca_base_requested = false;
3673 }
3674 if ( info->sca_statctrl_requested ) {
3675 release_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE);
3676 info->sca_statctrl_requested = false;
3677 }
3678
3679 if (info->memory_base){
3680 iounmap(info->memory_base);
3681 info->memory_base = NULL;
3682 }
3683
3684 if (info->sca_base) {
3685 iounmap(info->sca_base - info->sca_offset);
3686 info->sca_base=NULL;
3687 }
3688
3689 if (info->statctrl_base) {
3690 iounmap(info->statctrl_base - info->statctrl_offset);
3691 info->statctrl_base=NULL;
3692 }
3693
3694 if (info->lcr_base){
3695 iounmap(info->lcr_base - info->lcr_offset);
3696 info->lcr_base = NULL;
3697 }
3698
3699 if ( debug_level >= DEBUG_LEVEL_INFO )
3700 printk( "%s(%d):%s release_resources() exit\n",
3701 __FILE__,__LINE__,info->device_name );
3702 }
3703
3704 /* Add the specified device instance data structure to the
3705 * global linked list of devices and increment the device count.
3706 */
3707 static void add_device(SLMP_INFO *info)
3708 {
3709 info->next_device = NULL;
3710 info->line = synclinkmp_device_count;
3711 sprintf(info->device_name,"ttySLM%dp%d",info->adapter_num,info->port_num);
3712
3713 if (info->line < MAX_DEVICES) {
3714 if (maxframe[info->line])
3715 info->max_frame_size = maxframe[info->line];
3716 }
3717
3718 synclinkmp_device_count++;
3719
3720 if ( !synclinkmp_device_list )
3721 synclinkmp_device_list = info;
3722 else {
3723 SLMP_INFO *current_dev = synclinkmp_device_list;
3724 while( current_dev->next_device )
3725 current_dev = current_dev->next_device;
3726 current_dev->next_device = info;
3727 }
3728
3729 if ( info->max_frame_size < 4096 )
3730 info->max_frame_size = 4096;
3731 else if ( info->max_frame_size > 65535 )
3732 info->max_frame_size = 65535;
3733
3734 printk( "SyncLink MultiPort %s: "
3735 "Mem=(%08x %08X %08x %08X) IRQ=%d MaxFrameSize=%u\n",
3736 info->device_name,
3737 info->phys_sca_base,
3738 info->phys_memory_base,
3739 info->phys_statctrl_base,
3740 info->phys_lcr_base,
3741 info->irq_level,
3742 info->max_frame_size );
3743
3744 #if SYNCLINK_GENERIC_HDLC
3745 hdlcdev_init(info);
3746 #endif
3747 }
3748
3749 static const struct tty_port_operations port_ops = {
3750 .carrier_raised = carrier_raised,
3751 .dtr_rts = dtr_rts,
3752 };
3753
3754 /* Allocate and initialize a device instance structure
3755 *
3756 * Return Value: pointer to SLMP_INFO if success, otherwise NULL
3757 */
3758 static SLMP_INFO *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev)
3759 {
3760 SLMP_INFO *info;
3761
3762 info = kzalloc(sizeof(SLMP_INFO),
3763 GFP_KERNEL);
3764
3765 if (!info) {
3766 printk("%s(%d) Error can't allocate device instance data for adapter %d, port %d\n",
3767 __FILE__,__LINE__, adapter_num, port_num);
3768 } else {
3769 tty_port_init(&info->port);
3770 info->port.ops = &port_ops;
3771 info->magic = MGSL_MAGIC;
3772 INIT_WORK(&info->task, bh_handler);
3773 info->max_frame_size = 4096;
3774 info->port.close_delay = 5*HZ/10;
3775 info->port.closing_wait = 30*HZ;
3776 init_waitqueue_head(&info->status_event_wait_q);
3777 init_waitqueue_head(&info->event_wait_q);
3778 spin_lock_init(&info->netlock);
3779 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
3780 info->idle_mode = HDLC_TXIDLE_FLAGS;
3781 info->adapter_num = adapter_num;
3782 info->port_num = port_num;
3783
3784 /* Copy configuration info to device instance data */
3785 info->irq_level = pdev->irq;
3786 info->phys_lcr_base = pci_resource_start(pdev,0);
3787 info->phys_sca_base = pci_resource_start(pdev,2);
3788 info->phys_memory_base = pci_resource_start(pdev,3);
3789 info->phys_statctrl_base = pci_resource_start(pdev,4);
3790
3791 /* Because veremap only works on page boundaries we must map
3792 * a larger area than is actually implemented for the LCR
3793 * memory range. We map a full page starting at the page boundary.
3794 */
3795 info->lcr_offset = info->phys_lcr_base & (PAGE_SIZE-1);
3796 info->phys_lcr_base &= ~(PAGE_SIZE-1);
3797
3798 info->sca_offset = info->phys_sca_base & (PAGE_SIZE-1);
3799 info->phys_sca_base &= ~(PAGE_SIZE-1);
3800
3801 info->statctrl_offset = info->phys_statctrl_base & (PAGE_SIZE-1);
3802 info->phys_statctrl_base &= ~(PAGE_SIZE-1);
3803
3804 info->bus_type = MGSL_BUS_TYPE_PCI;
3805 info->irq_flags = IRQF_SHARED;
3806
3807 setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
3808 setup_timer(&info->status_timer, status_timeout,
3809 (unsigned long)info);
3810
3811 /* Store the PCI9050 misc control register value because a flaw
3812 * in the PCI9050 prevents LCR registers from being read if
3813 * BIOS assigns an LCR base address with bit 7 set.
3814 *
3815 * Only the misc control register is accessed for which only
3816 * write access is needed, so set an initial value and change
3817 * bits to the device instance data as we write the value
3818 * to the actual misc control register.
3819 */
3820 info->misc_ctrl_value = 0x087e4546;
3821
3822 /* initial port state is unknown - if startup errors
3823 * occur, init_error will be set to indicate the
3824 * problem. Once the port is fully initialized,
3825 * this value will be set to 0 to indicate the
3826 * port is available.
3827 */
3828 info->init_error = -1;
3829 }
3830
3831 return info;
3832 }
3833
3834 static void device_init(int adapter_num, struct pci_dev *pdev)
3835 {
3836 SLMP_INFO *port_array[SCA_MAX_PORTS];
3837 int port;
3838
3839 /* allocate device instances for up to SCA_MAX_PORTS devices */
3840 for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
3841 port_array[port] = alloc_dev(adapter_num,port,pdev);
3842 if( port_array[port] == NULL ) {
3843 for (--port; port >= 0; --port) {
3844 tty_port_destroy(&port_array[port]->port);
3845 kfree(port_array[port]);
3846 }
3847 return;
3848 }
3849 }
3850
3851 /* give copy of port_array to all ports and add to device list */
3852 for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
3853 memcpy(port_array[port]->port_array,port_array,sizeof(port_array));
3854 add_device( port_array[port] );
3855 spin_lock_init(&port_array[port]->lock);
3856 }
3857
3858 /* Allocate and claim adapter resources */
3859 if ( !claim_resources(port_array[0]) ) {
3860
3861 alloc_dma_bufs(port_array[0]);
3862
3863 /* copy resource information from first port to others */
3864 for ( port = 1; port < SCA_MAX_PORTS; ++port ) {
3865 port_array[port]->lock = port_array[0]->lock;
3866 port_array[port]->irq_level = port_array[0]->irq_level;
3867 port_array[port]->memory_base = port_array[0]->memory_base;
3868 port_array[port]->sca_base = port_array[0]->sca_base;
3869 port_array[port]->statctrl_base = port_array[0]->statctrl_base;
3870 port_array[port]->lcr_base = port_array[0]->lcr_base;
3871 alloc_dma_bufs(port_array[port]);
3872 }
3873
3874 if ( request_irq(port_array[0]->irq_level,
3875 synclinkmp_interrupt,
3876 port_array[0]->irq_flags,
3877 port_array[0]->device_name,
3878 port_array[0]) < 0 ) {
3879 printk( "%s(%d):%s Can't request interrupt, IRQ=%d\n",
3880 __FILE__,__LINE__,
3881 port_array[0]->device_name,
3882 port_array[0]->irq_level );
3883 }
3884 else {
3885 port_array[0]->irq_requested = true;
3886 adapter_test(port_array[0]);
3887 }
3888 }
3889 }
3890
3891 static const struct tty_operations ops = {
3892 .install = install,
3893 .open = open,
3894 .close = close,
3895 .write = write,
3896 .put_char = put_char,
3897 .flush_chars = flush_chars,
3898 .write_room = write_room,
3899 .chars_in_buffer = chars_in_buffer,
3900 .flush_buffer = flush_buffer,
3901 .ioctl = ioctl,
3902 .throttle = throttle,
3903 .unthrottle = unthrottle,
3904 .send_xchar = send_xchar,
3905 .break_ctl = set_break,
3906 .wait_until_sent = wait_until_sent,
3907 .set_termios = set_termios,
3908 .stop = tx_hold,
3909 .start = tx_release,
3910 .hangup = hangup,
3911 .tiocmget = tiocmget,
3912 .tiocmset = tiocmset,
3913 .get_icount = get_icount,
3914 .proc_fops = &synclinkmp_proc_fops,
3915 };
3916
3917
3918 static void synclinkmp_cleanup(void)
3919 {
3920 int rc;
3921 SLMP_INFO *info;
3922 SLMP_INFO *tmp;
3923
3924 printk("Unloading %s %s\n", driver_name, driver_version);
3925
3926 if (serial_driver) {
3927 if ((rc = tty_unregister_driver(serial_driver)))
3928 printk("%s(%d) failed to unregister tty driver err=%d\n",
3929 __FILE__,__LINE__,rc);
3930 put_tty_driver(serial_driver);
3931 }
3932
3933 /* reset devices */
3934 info = synclinkmp_device_list;
3935 while(info) {
3936 reset_port(info);
3937 info = info->next_device;
3938 }
3939
3940 /* release devices */
3941 info = synclinkmp_device_list;
3942 while(info) {
3943 #if SYNCLINK_GENERIC_HDLC
3944 hdlcdev_exit(info);
3945 #endif
3946 free_dma_bufs(info);
3947 free_tmp_rx_buf(info);
3948 if ( info->port_num == 0 ) {
3949 if (info->sca_base)
3950 write_reg(info, LPR, 1); /* set low power mode */
3951 release_resources(info);
3952 }
3953 tmp = info;
3954 info = info->next_device;
3955 tty_port_destroy(&tmp->port);
3956 kfree(tmp);
3957 }
3958
3959 pci_unregister_driver(&synclinkmp_pci_driver);
3960 }
3961
3962 /* Driver initialization entry point.
3963 */
3964
3965 static int __init synclinkmp_init(void)
3966 {
3967 int rc;
3968
3969 if (break_on_load) {
3970 synclinkmp_get_text_ptr();
3971 BREAKPOINT();
3972 }
3973
3974 printk("%s %s\n", driver_name, driver_version);
3975
3976 if ((rc = pci_register_driver(&synclinkmp_pci_driver)) < 0) {
3977 printk("%s:failed to register PCI driver, error=%d\n",__FILE__,rc);
3978 return rc;
3979 }
3980
3981 serial_driver = alloc_tty_driver(128);
3982 if (!serial_driver) {
3983 rc = -ENOMEM;
3984 goto error;
3985 }
3986
3987 /* Initialize the tty_driver structure */
3988
3989 serial_driver->driver_name = "synclinkmp";
3990 serial_driver->name = "ttySLM";
3991 serial_driver->major = ttymajor;
3992 serial_driver->minor_start = 64;
3993 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
3994 serial_driver->subtype = SERIAL_TYPE_NORMAL;
3995 serial_driver->init_termios = tty_std_termios;
3996 serial_driver->init_termios.c_cflag =
3997 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
3998 serial_driver->init_termios.c_ispeed = 9600;
3999 serial_driver->init_termios.c_ospeed = 9600;
4000 serial_driver->flags = TTY_DRIVER_REAL_RAW;
4001 tty_set_operations(serial_driver, &ops);
4002 if ((rc = tty_register_driver(serial_driver)) < 0) {
4003 printk("%s(%d):Couldn't register serial driver\n",
4004 __FILE__,__LINE__);
4005 put_tty_driver(serial_driver);
4006 serial_driver = NULL;
4007 goto error;
4008 }
4009
4010 printk("%s %s, tty major#%d\n",
4011 driver_name, driver_version,
4012 serial_driver->major);
4013
4014 return 0;
4015
4016 error:
4017 synclinkmp_cleanup();
4018 return rc;
4019 }
4020
4021 static void __exit synclinkmp_exit(void)
4022 {
4023 synclinkmp_cleanup();
4024 }
4025
4026 module_init(synclinkmp_init);
4027 module_exit(synclinkmp_exit);
4028
4029 /* Set the port for internal loopback mode.
4030 * The TxCLK and RxCLK signals are generated from the BRG and
4031 * the TxD is looped back to the RxD internally.
4032 */
4033 static void enable_loopback(SLMP_INFO *info, int enable)
4034 {
4035 if (enable) {
4036 /* MD2 (Mode Register 2)
4037 * 01..00 CNCT<1..0> Channel Connection 11=Local Loopback
4038 */
4039 write_reg(info, MD2, (unsigned char)(read_reg(info, MD2) | (BIT1 + BIT0)));
4040
4041 /* degate external TxC clock source */
4042 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4043 write_control_reg(info);
4044
4045 /* RXS/TXS (Rx/Tx clock source)
4046 * 07 Reserved, must be 0
4047 * 06..04 Clock Source, 100=BRG
4048 * 03..00 Clock Divisor, 0000=1
4049 */
4050 write_reg(info, RXS, 0x40);
4051 write_reg(info, TXS, 0x40);
4052
4053 } else {
4054 /* MD2 (Mode Register 2)
4055 * 01..00 CNCT<1..0> Channel connection, 0=normal
4056 */
4057 write_reg(info, MD2, (unsigned char)(read_reg(info, MD2) & ~(BIT1 + BIT0)));
4058
4059 /* RXS/TXS (Rx/Tx clock source)
4060 * 07 Reserved, must be 0
4061 * 06..04 Clock Source, 000=RxC/TxC Pin
4062 * 03..00 Clock Divisor, 0000=1
4063 */
4064 write_reg(info, RXS, 0x00);
4065 write_reg(info, TXS, 0x00);
4066 }
4067
4068 /* set LinkSpeed if available, otherwise default to 2Mbps */
4069 if (info->params.clock_speed)
4070 set_rate(info, info->params.clock_speed);
4071 else
4072 set_rate(info, 3686400);
4073 }
4074
4075 /* Set the baud rate register to the desired speed
4076 *
4077 * data_rate data rate of clock in bits per second
4078 * A data rate of 0 disables the AUX clock.
4079 */
4080 static void set_rate( SLMP_INFO *info, u32 data_rate )
4081 {
4082 u32 TMCValue;
4083 unsigned char BRValue;
4084 u32 Divisor=0;
4085
4086 /* fBRG = fCLK/(TMC * 2^BR)
4087 */
4088 if (data_rate != 0) {
4089 Divisor = 14745600/data_rate;
4090 if (!Divisor)
4091 Divisor = 1;
4092
4093 TMCValue = Divisor;
4094
4095 BRValue = 0;
4096 if (TMCValue != 1 && TMCValue != 2) {
4097 /* BRValue of 0 provides 50/50 duty cycle *only* when
4098 * TMCValue is 1 or 2. BRValue of 1 to 9 always provides
4099 * 50/50 duty cycle.
4100 */
4101 BRValue = 1;
4102 TMCValue >>= 1;
4103 }
4104
4105 /* while TMCValue is too big for TMC register, divide
4106 * by 2 and increment BR exponent.
4107 */
4108 for(; TMCValue > 256 && BRValue < 10; BRValue++)
4109 TMCValue >>= 1;
4110
4111 write_reg(info, TXS,
4112 (unsigned char)((read_reg(info, TXS) & 0xf0) | BRValue));
4113 write_reg(info, RXS,
4114 (unsigned char)((read_reg(info, RXS) & 0xf0) | BRValue));
4115 write_reg(info, TMC, (unsigned char)TMCValue);
4116 }
4117 else {
4118 write_reg(info, TXS,0);
4119 write_reg(info, RXS,0);
4120 write_reg(info, TMC, 0);
4121 }
4122 }
4123
4124 /* Disable receiver
4125 */
4126 static void rx_stop(SLMP_INFO *info)
4127 {
4128 if (debug_level >= DEBUG_LEVEL_ISR)
4129 printk("%s(%d):%s rx_stop()\n",
4130 __FILE__,__LINE__, info->device_name );
4131
4132 write_reg(info, CMD, RXRESET);
4133
4134 info->ie0_value &= ~RXRDYE;
4135 write_reg(info, IE0, info->ie0_value); /* disable Rx data interrupts */
4136
4137 write_reg(info, RXDMA + DSR, 0); /* disable Rx DMA */
4138 write_reg(info, RXDMA + DCMD, SWABORT); /* reset/init Rx DMA */
4139 write_reg(info, RXDMA + DIR, 0); /* disable Rx DMA interrupts */
4140
4141 info->rx_enabled = false;
4142 info->rx_overflow = false;
4143 }
4144
4145 /* enable the receiver
4146 */
4147 static void rx_start(SLMP_INFO *info)
4148 {
4149 int i;
4150
4151 if (debug_level >= DEBUG_LEVEL_ISR)
4152 printk("%s(%d):%s rx_start()\n",
4153 __FILE__,__LINE__, info->device_name );
4154
4155 write_reg(info, CMD, RXRESET);
4156
4157 if ( info->params.mode == MGSL_MODE_HDLC ) {
4158 /* HDLC, disabe IRQ on rxdata */
4159 info->ie0_value &= ~RXRDYE;
4160 write_reg(info, IE0, info->ie0_value);
4161
4162 /* Reset all Rx DMA buffers and program rx dma */
4163 write_reg(info, RXDMA + DSR, 0); /* disable Rx DMA */
4164 write_reg(info, RXDMA + DCMD, SWABORT); /* reset/init Rx DMA */
4165
4166 for (i = 0; i < info->rx_buf_count; i++) {
4167 info->rx_buf_list[i].status = 0xff;
4168
4169 // throttle to 4 shared memory writes at a time to prevent
4170 // hogging local bus (keep latency time for DMA requests low).
4171 if (!(i % 4))
4172 read_status_reg(info);
4173 }
4174 info->current_rx_buf = 0;
4175
4176 /* set current/1st descriptor address */
4177 write_reg16(info, RXDMA + CDA,
4178 info->rx_buf_list_ex[0].phys_entry);
4179
4180 /* set new last rx descriptor address */
4181 write_reg16(info, RXDMA + EDA,
4182 info->rx_buf_list_ex[info->rx_buf_count - 1].phys_entry);
4183
4184 /* set buffer length (shared by all rx dma data buffers) */
4185 write_reg16(info, RXDMA + BFL, SCABUFSIZE);
4186
4187 write_reg(info, RXDMA + DIR, 0x60); /* enable Rx DMA interrupts (EOM/BOF) */
4188 write_reg(info, RXDMA + DSR, 0xf2); /* clear Rx DMA IRQs, enable Rx DMA */
4189 } else {
4190 /* async, enable IRQ on rxdata */
4191 info->ie0_value |= RXRDYE;
4192 write_reg(info, IE0, info->ie0_value);
4193 }
4194
4195 write_reg(info, CMD, RXENABLE);
4196
4197 info->rx_overflow = false;
4198 info->rx_enabled = true;
4199 }
4200
4201 /* Enable the transmitter and send a transmit frame if
4202 * one is loaded in the DMA buffers.
4203 */
4204 static void tx_start(SLMP_INFO *info)
4205 {
4206 if (debug_level >= DEBUG_LEVEL_ISR)
4207 printk("%s(%d):%s tx_start() tx_count=%d\n",
4208 __FILE__,__LINE__, info->device_name,info->tx_count );
4209
4210 if (!info->tx_enabled ) {
4211 write_reg(info, CMD, TXRESET);
4212 write_reg(info, CMD, TXENABLE);
4213 info->tx_enabled = true;
4214 }
4215
4216 if ( info->tx_count ) {
4217
4218 /* If auto RTS enabled and RTS is inactive, then assert */
4219 /* RTS and set a flag indicating that the driver should */
4220 /* negate RTS when the transmission completes. */
4221
4222 info->drop_rts_on_tx_done = false;
4223
4224 if (info->params.mode != MGSL_MODE_ASYNC) {
4225
4226 if ( info->params.flags & HDLC_FLAG_AUTO_RTS ) {
4227 get_signals( info );
4228 if ( !(info->serial_signals & SerialSignal_RTS) ) {
4229 info->serial_signals |= SerialSignal_RTS;
4230 set_signals( info );
4231 info->drop_rts_on_tx_done = true;
4232 }
4233 }
4234
4235 write_reg16(info, TRC0,
4236 (unsigned short)(((tx_negate_fifo_level-1)<<8) + tx_active_fifo_level));
4237
4238 write_reg(info, TXDMA + DSR, 0); /* disable DMA channel */
4239 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
4240
4241 /* set TX CDA (current descriptor address) */
4242 write_reg16(info, TXDMA + CDA,
4243 info->tx_buf_list_ex[0].phys_entry);
4244
4245 /* set TX EDA (last descriptor address) */
4246 write_reg16(info, TXDMA + EDA,
4247 info->tx_buf_list_ex[info->last_tx_buf].phys_entry);
4248
4249 /* enable underrun IRQ */
4250 info->ie1_value &= ~IDLE;
4251 info->ie1_value |= UDRN;
4252 write_reg(info, IE1, info->ie1_value);
4253 write_reg(info, SR1, (unsigned char)(IDLE + UDRN));
4254
4255 write_reg(info, TXDMA + DIR, 0x40); /* enable Tx DMA interrupts (EOM) */
4256 write_reg(info, TXDMA + DSR, 0xf2); /* clear Tx DMA IRQs, enable Tx DMA */
4257
4258 mod_timer(&info->tx_timer, jiffies +
4259 msecs_to_jiffies(5000));
4260 }
4261 else {
4262 tx_load_fifo(info);
4263 /* async, enable IRQ on txdata */
4264 info->ie0_value |= TXRDYE;
4265 write_reg(info, IE0, info->ie0_value);
4266 }
4267
4268 info->tx_active = true;
4269 }
4270 }
4271
4272 /* stop the transmitter and DMA
4273 */
4274 static void tx_stop( SLMP_INFO *info )
4275 {
4276 if (debug_level >= DEBUG_LEVEL_ISR)
4277 printk("%s(%d):%s tx_stop()\n",
4278 __FILE__,__LINE__, info->device_name );
4279
4280 del_timer(&info->tx_timer);
4281
4282 write_reg(info, TXDMA + DSR, 0); /* disable DMA channel */
4283 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
4284
4285 write_reg(info, CMD, TXRESET);
4286
4287 info->ie1_value &= ~(UDRN + IDLE);
4288 write_reg(info, IE1, info->ie1_value); /* disable tx status interrupts */
4289 write_reg(info, SR1, (unsigned char)(IDLE + UDRN)); /* clear pending */
4290
4291 info->ie0_value &= ~TXRDYE;
4292 write_reg(info, IE0, info->ie0_value); /* disable tx data interrupts */
4293
4294 info->tx_enabled = false;
4295 info->tx_active = false;
4296 }
4297
4298 /* Fill the transmit FIFO until the FIFO is full or
4299 * there is no more data to load.
4300 */
4301 static void tx_load_fifo(SLMP_INFO *info)
4302 {
4303 u8 TwoBytes[2];
4304
4305 /* do nothing is now tx data available and no XON/XOFF pending */
4306
4307 if ( !info->tx_count && !info->x_char )
4308 return;
4309
4310 /* load the Transmit FIFO until FIFOs full or all data sent */
4311
4312 while( info->tx_count && (read_reg(info,SR0) & BIT1) ) {
4313
4314 /* there is more space in the transmit FIFO and */
4315 /* there is more data in transmit buffer */
4316
4317 if ( (info->tx_count > 1) && !info->x_char ) {
4318 /* write 16-bits */
4319 TwoBytes[0] = info->tx_buf[info->tx_get++];
4320 if (info->tx_get >= info->max_frame_size)
4321 info->tx_get -= info->max_frame_size;
4322 TwoBytes[1] = info->tx_buf[info->tx_get++];
4323 if (info->tx_get >= info->max_frame_size)
4324 info->tx_get -= info->max_frame_size;
4325
4326 write_reg16(info, TRB, *((u16 *)TwoBytes));
4327
4328 info->tx_count -= 2;
4329 info->icount.tx += 2;
4330 } else {
4331 /* only 1 byte left to transmit or 1 FIFO slot left */
4332
4333 if (info->x_char) {
4334 /* transmit pending high priority char */
4335 write_reg(info, TRB, info->x_char);
4336 info->x_char = 0;
4337 } else {
4338 write_reg(info, TRB, info->tx_buf[info->tx_get++]);
4339 if (info->tx_get >= info->max_frame_size)
4340 info->tx_get -= info->max_frame_size;
4341 info->tx_count--;
4342 }
4343 info->icount.tx++;
4344 }
4345 }
4346 }
4347
4348 /* Reset a port to a known state
4349 */
4350 static void reset_port(SLMP_INFO *info)
4351 {
4352 if (info->sca_base) {
4353
4354 tx_stop(info);
4355 rx_stop(info);
4356
4357 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
4358 set_signals(info);
4359
4360 /* disable all port interrupts */
4361 info->ie0_value = 0;
4362 info->ie1_value = 0;
4363 info->ie2_value = 0;
4364 write_reg(info, IE0, info->ie0_value);
4365 write_reg(info, IE1, info->ie1_value);
4366 write_reg(info, IE2, info->ie2_value);
4367
4368 write_reg(info, CMD, CHRESET);
4369 }
4370 }
4371
4372 /* Reset all the ports to a known state.
4373 */
4374 static void reset_adapter(SLMP_INFO *info)
4375 {
4376 int i;
4377
4378 for ( i=0; i < SCA_MAX_PORTS; ++i) {
4379 if (info->port_array[i])
4380 reset_port(info->port_array[i]);
4381 }
4382 }
4383
4384 /* Program port for asynchronous communications.
4385 */
4386 static void async_mode(SLMP_INFO *info)
4387 {
4388
4389 unsigned char RegValue;
4390
4391 tx_stop(info);
4392 rx_stop(info);
4393
4394 /* MD0, Mode Register 0
4395 *
4396 * 07..05 PRCTL<2..0>, Protocol Mode, 000=async
4397 * 04 AUTO, Auto-enable (RTS/CTS/DCD)
4398 * 03 Reserved, must be 0
4399 * 02 CRCCC, CRC Calculation, 0=disabled
4400 * 01..00 STOP<1..0> Stop bits (00=1,10=2)
4401 *
4402 * 0000 0000
4403 */
4404 RegValue = 0x00;
4405 if (info->params.stop_bits != 1)
4406 RegValue |= BIT1;
4407 write_reg(info, MD0, RegValue);
4408
4409 /* MD1, Mode Register 1
4410 *
4411 * 07..06 BRATE<1..0>, bit rate, 00=1/1 01=1/16 10=1/32 11=1/64
4412 * 05..04 TXCHR<1..0>, tx char size, 00=8 bits,01=7,10=6,11=5
4413 * 03..02 RXCHR<1..0>, rx char size
4414 * 01..00 PMPM<1..0>, Parity mode, 00=none 10=even 11=odd
4415 *
4416 * 0100 0000
4417 */
4418 RegValue = 0x40;
4419 switch (info->params.data_bits) {
4420 case 7: RegValue |= BIT4 + BIT2; break;
4421 case 6: RegValue |= BIT5 + BIT3; break;
4422 case 5: RegValue |= BIT5 + BIT4 + BIT3 + BIT2; break;
4423 }
4424 if (info->params.parity != ASYNC_PARITY_NONE) {
4425 RegValue |= BIT1;
4426 if (info->params.parity == ASYNC_PARITY_ODD)
4427 RegValue |= BIT0;
4428 }
4429 write_reg(info, MD1, RegValue);
4430
4431 /* MD2, Mode Register 2
4432 *
4433 * 07..02 Reserved, must be 0
4434 * 01..00 CNCT<1..0> Channel connection, 00=normal 11=local loopback
4435 *
4436 * 0000 0000
4437 */
4438 RegValue = 0x00;
4439 if (info->params.loopback)
4440 RegValue |= (BIT1 + BIT0);
4441 write_reg(info, MD2, RegValue);
4442
4443 /* RXS, Receive clock source
4444 *
4445 * 07 Reserved, must be 0
4446 * 06..04 RXCS<2..0>, clock source, 000=RxC Pin, 100=BRG, 110=DPLL
4447 * 03..00 RXBR<3..0>, rate divisor, 0000=1
4448 */
4449 RegValue=BIT6;
4450 write_reg(info, RXS, RegValue);
4451
4452 /* TXS, Transmit clock source
4453 *
4454 * 07 Reserved, must be 0
4455 * 06..04 RXCS<2..0>, clock source, 000=TxC Pin, 100=BRG, 110=Receive Clock
4456 * 03..00 RXBR<3..0>, rate divisor, 0000=1
4457 */
4458 RegValue=BIT6;
4459 write_reg(info, TXS, RegValue);
4460
4461 /* Control Register
4462 *
4463 * 6,4,2,0 CLKSEL<3..0>, 0 = TcCLK in, 1 = Auxclk out
4464 */
4465 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4466 write_control_reg(info);
4467
4468 tx_set_idle(info);
4469
4470 /* RRC Receive Ready Control 0
4471 *
4472 * 07..05 Reserved, must be 0
4473 * 04..00 RRC<4..0> Rx FIFO trigger active 0x00 = 1 byte
4474 */
4475 write_reg(info, RRC, 0x00);
4476
4477 /* TRC0 Transmit Ready Control 0
4478 *
4479 * 07..05 Reserved, must be 0
4480 * 04..00 TRC<4..0> Tx FIFO trigger active 0x10 = 16 bytes
4481 */
4482 write_reg(info, TRC0, 0x10);
4483
4484 /* TRC1 Transmit Ready Control 1
4485 *
4486 * 07..05 Reserved, must be 0
4487 * 04..00 TRC<4..0> Tx FIFO trigger inactive 0x1e = 31 bytes (full-1)
4488 */
4489 write_reg(info, TRC1, 0x1e);
4490
4491 /* CTL, MSCI control register
4492 *
4493 * 07..06 Reserved, set to 0
4494 * 05 UDRNC, underrun control, 0=abort 1=CRC+flag (HDLC/BSC)
4495 * 04 IDLC, idle control, 0=mark 1=idle register
4496 * 03 BRK, break, 0=off 1 =on (async)
4497 * 02 SYNCLD, sync char load enable (BSC) 1=enabled
4498 * 01 GOP, go active on poll (LOOP mode) 1=enabled
4499 * 00 RTS, RTS output control, 0=active 1=inactive
4500 *
4501 * 0001 0001
4502 */
4503 RegValue = 0x10;
4504 if (!(info->serial_signals & SerialSignal_RTS))
4505 RegValue |= 0x01;
4506 write_reg(info, CTL, RegValue);
4507
4508 /* enable status interrupts */
4509 info->ie0_value |= TXINTE + RXINTE;
4510 write_reg(info, IE0, info->ie0_value);
4511
4512 /* enable break detect interrupt */
4513 info->ie1_value = BRKD;
4514 write_reg(info, IE1, info->ie1_value);
4515
4516 /* enable rx overrun interrupt */
4517 info->ie2_value = OVRN;
4518 write_reg(info, IE2, info->ie2_value);
4519
4520 set_rate( info, info->params.data_rate * 16 );
4521 }
4522
4523 /* Program the SCA for HDLC communications.
4524 */
4525 static void hdlc_mode(SLMP_INFO *info)
4526 {
4527 unsigned char RegValue;
4528 u32 DpllDivisor;
4529
4530 // Can't use DPLL because SCA outputs recovered clock on RxC when
4531 // DPLL mode selected. This causes output contention with RxC receiver.
4532 // Use of DPLL would require external hardware to disable RxC receiver
4533 // when DPLL mode selected.
4534 info->params.flags &= ~(HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL);
4535
4536 /* disable DMA interrupts */
4537 write_reg(info, TXDMA + DIR, 0);
4538 write_reg(info, RXDMA + DIR, 0);
4539
4540 /* MD0, Mode Register 0
4541 *
4542 * 07..05 PRCTL<2..0>, Protocol Mode, 100=HDLC
4543 * 04 AUTO, Auto-enable (RTS/CTS/DCD)
4544 * 03 Reserved, must be 0
4545 * 02 CRCCC, CRC Calculation, 1=enabled
4546 * 01 CRC1, CRC selection, 0=CRC-16,1=CRC-CCITT-16
4547 * 00 CRC0, CRC initial value, 1 = all 1s
4548 *
4549 * 1000 0001
4550 */
4551 RegValue = 0x81;
4552 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4553 RegValue |= BIT4;
4554 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4555 RegValue |= BIT4;
4556 if (info->params.crc_type == HDLC_CRC_16_CCITT)
4557 RegValue |= BIT2 + BIT1;
4558 write_reg(info, MD0, RegValue);
4559
4560 /* MD1, Mode Register 1
4561 *
4562 * 07..06 ADDRS<1..0>, Address detect, 00=no addr check
4563 * 05..04 TXCHR<1..0>, tx char size, 00=8 bits
4564 * 03..02 RXCHR<1..0>, rx char size, 00=8 bits
4565 * 01..00 PMPM<1..0>, Parity mode, 00=no parity
4566 *
4567 * 0000 0000
4568 */
4569 RegValue = 0x00;
4570 write_reg(info, MD1, RegValue);
4571
4572 /* MD2, Mode Register 2
4573 *
4574 * 07 NRZFM, 0=NRZ, 1=FM
4575 * 06..05 CODE<1..0> Encoding, 00=NRZ
4576 * 04..03 DRATE<1..0> DPLL Divisor, 00=8
4577 * 02 Reserved, must be 0
4578 * 01..00 CNCT<1..0> Channel connection, 0=normal
4579 *
4580 * 0000 0000
4581 */
4582 RegValue = 0x00;
4583 switch(info->params.encoding) {
4584 case HDLC_ENCODING_NRZI: RegValue |= BIT5; break;
4585 case HDLC_ENCODING_BIPHASE_MARK: RegValue |= BIT7 + BIT5; break; /* aka FM1 */
4586 case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT7 + BIT6; break; /* aka FM0 */
4587 case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT7; break; /* aka Manchester */
4588 #if 0
4589 case HDLC_ENCODING_NRZB: /* not supported */
4590 case HDLC_ENCODING_NRZI_MARK: /* not supported */
4591 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: /* not supported */
4592 #endif
4593 }
4594 if ( info->params.flags & HDLC_FLAG_DPLL_DIV16 ) {
4595 DpllDivisor = 16;
4596 RegValue |= BIT3;
4597 } else if ( info->params.flags & HDLC_FLAG_DPLL_DIV8 ) {
4598 DpllDivisor = 8;
4599 } else {
4600 DpllDivisor = 32;
4601 RegValue |= BIT4;
4602 }
4603 write_reg(info, MD2, RegValue);
4604
4605
4606 /* RXS, Receive clock source
4607 *
4608 * 07 Reserved, must be 0
4609 * 06..04 RXCS<2..0>, clock source, 000=RxC Pin, 100=BRG, 110=DPLL
4610 * 03..00 RXBR<3..0>, rate divisor, 0000=1
4611 */
4612 RegValue=0;
4613 if (info->params.flags & HDLC_FLAG_RXC_BRG)
4614 RegValue |= BIT6;
4615 if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4616 RegValue |= BIT6 + BIT5;
4617 write_reg(info, RXS, RegValue);
4618
4619 /* TXS, Transmit clock source
4620 *
4621 * 07 Reserved, must be 0
4622 * 06..04 RXCS<2..0>, clock source, 000=TxC Pin, 100=BRG, 110=Receive Clock
4623 * 03..00 RXBR<3..0>, rate divisor, 0000=1
4624 */
4625 RegValue=0;
4626 if (info->params.flags & HDLC_FLAG_TXC_BRG)
4627 RegValue |= BIT6;
4628 if (info->params.flags & HDLC_FLAG_TXC_DPLL)
4629 RegValue |= BIT6 + BIT5;
4630 write_reg(info, TXS, RegValue);
4631
4632 if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4633 set_rate(info, info->params.clock_speed * DpllDivisor);
4634 else
4635 set_rate(info, info->params.clock_speed);
4636
4637 /* GPDATA (General Purpose I/O Data Register)
4638 *
4639 * 6,4,2,0 CLKSEL<3..0>, 0 = TcCLK in, 1 = Auxclk out
4640 */
4641 if (info->params.flags & HDLC_FLAG_TXC_BRG)
4642 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4643 else
4644 info->port_array[0]->ctrlreg_value &= ~(BIT0 << (info->port_num * 2));
4645 write_control_reg(info);
4646
4647 /* RRC Receive Ready Control 0
4648 *
4649 * 07..05 Reserved, must be 0
4650 * 04..00 RRC<4..0> Rx FIFO trigger active
4651 */
4652 write_reg(info, RRC, rx_active_fifo_level);
4653
4654 /* TRC0 Transmit Ready Control 0
4655 *
4656 * 07..05 Reserved, must be 0
4657 * 04..00 TRC<4..0> Tx FIFO trigger active
4658 */
4659 write_reg(info, TRC0, tx_active_fifo_level);
4660
4661 /* TRC1 Transmit Ready Control 1
4662 *
4663 * 07..05 Reserved, must be 0
4664 * 04..00 TRC<4..0> Tx FIFO trigger inactive 0x1f = 32 bytes (full)
4665 */
4666 write_reg(info, TRC1, (unsigned char)(tx_negate_fifo_level - 1));
4667
4668 /* DMR, DMA Mode Register
4669 *
4670 * 07..05 Reserved, must be 0
4671 * 04 TMOD, Transfer Mode: 1=chained-block
4672 * 03 Reserved, must be 0
4673 * 02 NF, Number of Frames: 1=multi-frame
4674 * 01 CNTE, Frame End IRQ Counter enable: 0=disabled
4675 * 00 Reserved, must be 0
4676 *
4677 * 0001 0100
4678 */
4679 write_reg(info, TXDMA + DMR, 0x14);
4680 write_reg(info, RXDMA + DMR, 0x14);
4681
4682 /* Set chain pointer base (upper 8 bits of 24 bit addr) */
4683 write_reg(info, RXDMA + CPB,
4684 (unsigned char)(info->buffer_list_phys >> 16));
4685
4686 /* Set chain pointer base (upper 8 bits of 24 bit addr) */
4687 write_reg(info, TXDMA + CPB,
4688 (unsigned char)(info->buffer_list_phys >> 16));
4689
4690 /* enable status interrupts. other code enables/disables
4691 * the individual sources for these two interrupt classes.
4692 */
4693 info->ie0_value |= TXINTE + RXINTE;
4694 write_reg(info, IE0, info->ie0_value);
4695
4696 /* CTL, MSCI control register
4697 *
4698 * 07..06 Reserved, set to 0
4699 * 05 UDRNC, underrun control, 0=abort 1=CRC+flag (HDLC/BSC)
4700 * 04 IDLC, idle control, 0=mark 1=idle register
4701 * 03 BRK, break, 0=off 1 =on (async)
4702 * 02 SYNCLD, sync char load enable (BSC) 1=enabled
4703 * 01 GOP, go active on poll (LOOP mode) 1=enabled
4704 * 00 RTS, RTS output control, 0=active 1=inactive
4705 *
4706 * 0001 0001
4707 */
4708 RegValue = 0x10;
4709 if (!(info->serial_signals & SerialSignal_RTS))
4710 RegValue |= 0x01;
4711 write_reg(info, CTL, RegValue);
4712
4713 /* preamble not supported ! */
4714
4715 tx_set_idle(info);
4716 tx_stop(info);
4717 rx_stop(info);
4718
4719 set_rate(info, info->params.clock_speed);
4720
4721 if (info->params.loopback)
4722 enable_loopback(info,1);
4723 }
4724
4725 /* Set the transmit HDLC idle mode
4726 */
4727 static void tx_set_idle(SLMP_INFO *info)
4728 {
4729 unsigned char RegValue = 0xff;
4730
4731 /* Map API idle mode to SCA register bits */
4732 switch(info->idle_mode) {
4733 case HDLC_TXIDLE_FLAGS: RegValue = 0x7e; break;
4734 case HDLC_TXIDLE_ALT_ZEROS_ONES: RegValue = 0xaa; break;
4735 case HDLC_TXIDLE_ZEROS: RegValue = 0x00; break;
4736 case HDLC_TXIDLE_ONES: RegValue = 0xff; break;
4737 case HDLC_TXIDLE_ALT_MARK_SPACE: RegValue = 0xaa; break;
4738 case HDLC_TXIDLE_SPACE: RegValue = 0x00; break;
4739 case HDLC_TXIDLE_MARK: RegValue = 0xff; break;
4740 }
4741
4742 write_reg(info, IDL, RegValue);
4743 }
4744
4745 /* Query the adapter for the state of the V24 status (input) signals.
4746 */
4747 static void get_signals(SLMP_INFO *info)
4748 {
4749 u16 status = read_reg(info, SR3);
4750 u16 gpstatus = read_status_reg(info);
4751 u16 testbit;
4752
4753 /* clear all serial signals except RTS and DTR */
4754 info->serial_signals &= SerialSignal_RTS | SerialSignal_DTR;
4755
4756 /* set serial signal bits to reflect MISR */
4757
4758 if (!(status & BIT3))
4759 info->serial_signals |= SerialSignal_CTS;
4760
4761 if ( !(status & BIT2))
4762 info->serial_signals |= SerialSignal_DCD;
4763
4764 testbit = BIT1 << (info->port_num * 2); // Port 0..3 RI is GPDATA<1,3,5,7>
4765 if (!(gpstatus & testbit))
4766 info->serial_signals |= SerialSignal_RI;
4767
4768 testbit = BIT0 << (info->port_num * 2); // Port 0..3 DSR is GPDATA<0,2,4,6>
4769 if (!(gpstatus & testbit))
4770 info->serial_signals |= SerialSignal_DSR;
4771 }
4772
4773 /* Set the state of RTS and DTR based on contents of
4774 * serial_signals member of device context.
4775 */
4776 static void set_signals(SLMP_INFO *info)
4777 {
4778 unsigned char RegValue;
4779 u16 EnableBit;
4780
4781 RegValue = read_reg(info, CTL);
4782 if (info->serial_signals & SerialSignal_RTS)
4783 RegValue &= ~BIT0;
4784 else
4785 RegValue |= BIT0;
4786 write_reg(info, CTL, RegValue);
4787
4788 // Port 0..3 DTR is ctrl reg <1,3,5,7>
4789 EnableBit = BIT1 << (info->port_num*2);
4790 if (info->serial_signals & SerialSignal_DTR)
4791 info->port_array[0]->ctrlreg_value &= ~EnableBit;
4792 else
4793 info->port_array[0]->ctrlreg_value |= EnableBit;
4794 write_control_reg(info);
4795 }
4796
4797 /*******************/
4798 /* DMA Buffer Code */
4799 /*******************/
4800
4801 /* Set the count for all receive buffers to SCABUFSIZE
4802 * and set the current buffer to the first buffer. This effectively
4803 * makes all buffers free and discards any data in buffers.
4804 */
4805 static void rx_reset_buffers(SLMP_INFO *info)
4806 {
4807 rx_free_frame_buffers(info, 0, info->rx_buf_count - 1);
4808 }
4809
4810 /* Free the buffers used by a received frame
4811 *
4812 * info pointer to device instance data
4813 * first index of 1st receive buffer of frame
4814 * last index of last receive buffer of frame
4815 */
4816 static void rx_free_frame_buffers(SLMP_INFO *info, unsigned int first, unsigned int last)
4817 {
4818 bool done = false;
4819
4820 while(!done) {
4821 /* reset current buffer for reuse */
4822 info->rx_buf_list[first].status = 0xff;
4823
4824 if (first == last) {
4825 done = true;
4826 /* set new last rx descriptor address */
4827 write_reg16(info, RXDMA + EDA, info->rx_buf_list_ex[first].phys_entry);
4828 }
4829
4830 first++;
4831 if (first == info->rx_buf_count)
4832 first = 0;
4833 }
4834
4835 /* set current buffer to next buffer after last buffer of frame */
4836 info->current_rx_buf = first;
4837 }
4838
4839 /* Return a received frame from the receive DMA buffers.
4840 * Only frames received without errors are returned.
4841 *
4842 * Return Value: true if frame returned, otherwise false
4843 */
4844 static bool rx_get_frame(SLMP_INFO *info)
4845 {
4846 unsigned int StartIndex, EndIndex; /* index of 1st and last buffers of Rx frame */
4847 unsigned short status;
4848 unsigned int framesize = 0;
4849 bool ReturnCode = false;
4850 unsigned long flags;
4851 struct tty_struct *tty = info->port.tty;
4852 unsigned char addr_field = 0xff;
4853 SCADESC *desc;
4854 SCADESC_EX *desc_ex;
4855
4856 CheckAgain:
4857 /* assume no frame returned, set zero length */
4858 framesize = 0;
4859 addr_field = 0xff;
4860
4861 /*
4862 * current_rx_buf points to the 1st buffer of the next available
4863 * receive frame. To find the last buffer of the frame look for
4864 * a non-zero status field in the buffer entries. (The status
4865 * field is set by the 16C32 after completing a receive frame.
4866 */
4867 StartIndex = EndIndex = info->current_rx_buf;
4868
4869 for ( ;; ) {
4870 desc = &info->rx_buf_list[EndIndex];
4871 desc_ex = &info->rx_buf_list_ex[EndIndex];
4872
4873 if (desc->status == 0xff)
4874 goto Cleanup; /* current desc still in use, no frames available */
4875
4876 if (framesize == 0 && info->params.addr_filter != 0xff)
4877 addr_field = desc_ex->virt_addr[0];
4878
4879 framesize += desc->length;
4880
4881 /* Status != 0 means last buffer of frame */
4882 if (desc->status)
4883 break;
4884
4885 EndIndex++;
4886 if (EndIndex == info->rx_buf_count)
4887 EndIndex = 0;
4888
4889 if (EndIndex == info->current_rx_buf) {
4890 /* all buffers have been 'used' but none mark */
4891 /* the end of a frame. Reset buffers and receiver. */
4892 if ( info->rx_enabled ){
4893 spin_lock_irqsave(&info->lock,flags);
4894 rx_start(info);
4895 spin_unlock_irqrestore(&info->lock,flags);
4896 }
4897 goto Cleanup;
4898 }
4899
4900 }
4901
4902 /* check status of receive frame */
4903
4904 /* frame status is byte stored after frame data
4905 *
4906 * 7 EOM (end of msg), 1 = last buffer of frame
4907 * 6 Short Frame, 1 = short frame
4908 * 5 Abort, 1 = frame aborted
4909 * 4 Residue, 1 = last byte is partial
4910 * 3 Overrun, 1 = overrun occurred during frame reception
4911 * 2 CRC, 1 = CRC error detected
4912 *
4913 */
4914 status = desc->status;
4915
4916 /* ignore CRC bit if not using CRC (bit is undefined) */
4917 /* Note:CRC is not save to data buffer */
4918 if (info->params.crc_type == HDLC_CRC_NONE)
4919 status &= ~BIT2;
4920
4921 if (framesize == 0 ||
4922 (addr_field != 0xff && addr_field != info->params.addr_filter)) {
4923 /* discard 0 byte frames, this seems to occur sometime
4924 * when remote is idling flags.
4925 */
4926 rx_free_frame_buffers(info, StartIndex, EndIndex);
4927 goto CheckAgain;
4928 }
4929
4930 if (framesize < 2)
4931 status |= BIT6;
4932
4933 if (status & (BIT6+BIT5+BIT3+BIT2)) {
4934 /* received frame has errors,
4935 * update counts and mark frame size as 0
4936 */
4937 if (status & BIT6)
4938 info->icount.rxshort++;
4939 else if (status & BIT5)
4940 info->icount.rxabort++;
4941 else if (status & BIT3)
4942 info->icount.rxover++;
4943 else
4944 info->icount.rxcrc++;
4945
4946 framesize = 0;
4947 #if SYNCLINK_GENERIC_HDLC
4948 {
4949 info->netdev->stats.rx_errors++;
4950 info->netdev->stats.rx_frame_errors++;
4951 }
4952 #endif
4953 }
4954
4955 if ( debug_level >= DEBUG_LEVEL_BH )
4956 printk("%s(%d):%s rx_get_frame() status=%04X size=%d\n",
4957 __FILE__,__LINE__,info->device_name,status,framesize);
4958
4959 if ( debug_level >= DEBUG_LEVEL_DATA )
4960 trace_block(info,info->rx_buf_list_ex[StartIndex].virt_addr,
4961 min_t(unsigned int, framesize, SCABUFSIZE), 0);
4962
4963 if (framesize) {
4964 if (framesize > info->max_frame_size)
4965 info->icount.rxlong++;
4966 else {
4967 /* copy dma buffer(s) to contiguous intermediate buffer */
4968 int copy_count = framesize;
4969 int index = StartIndex;
4970 unsigned char *ptmp = info->tmp_rx_buf;
4971 info->tmp_rx_buf_count = framesize;
4972
4973 info->icount.rxok++;
4974
4975 while(copy_count) {
4976 int partial_count = min(copy_count,SCABUFSIZE);
4977 memcpy( ptmp,
4978 info->rx_buf_list_ex[index].virt_addr,
4979 partial_count );
4980 ptmp += partial_count;
4981 copy_count -= partial_count;
4982
4983 if ( ++index == info->rx_buf_count )
4984 index = 0;
4985 }
4986
4987 #if SYNCLINK_GENERIC_HDLC
4988 if (info->netcount)
4989 hdlcdev_rx(info,info->tmp_rx_buf,framesize);
4990 else
4991 #endif
4992 ldisc_receive_buf(tty,info->tmp_rx_buf,
4993 info->flag_buf, framesize);
4994 }
4995 }
4996 /* Free the buffers used by this frame. */
4997 rx_free_frame_buffers( info, StartIndex, EndIndex );
4998
4999 ReturnCode = true;
5000
5001 Cleanup:
5002 if ( info->rx_enabled && info->rx_overflow ) {
5003 /* Receiver is enabled, but needs to restarted due to
5004 * rx buffer overflow. If buffers are empty, restart receiver.
5005 */
5006 if (info->rx_buf_list[EndIndex].status == 0xff) {
5007 spin_lock_irqsave(&info->lock,flags);
5008 rx_start(info);
5009 spin_unlock_irqrestore(&info->lock,flags);
5010 }
5011 }
5012
5013 return ReturnCode;
5014 }
5015
5016 /* load the transmit DMA buffer with data
5017 */
5018 static void tx_load_dma_buffer(SLMP_INFO *info, const char *buf, unsigned int count)
5019 {
5020 unsigned short copy_count;
5021 unsigned int i = 0;
5022 SCADESC *desc;
5023 SCADESC_EX *desc_ex;
5024
5025 if ( debug_level >= DEBUG_LEVEL_DATA )
5026 trace_block(info, buf, min_t(unsigned int, count, SCABUFSIZE), 1);
5027
5028 /* Copy source buffer to one or more DMA buffers, starting with
5029 * the first transmit dma buffer.
5030 */
5031 for(i=0;;)
5032 {
5033 copy_count = min_t(unsigned int, count, SCABUFSIZE);
5034
5035 desc = &info->tx_buf_list[i];
5036 desc_ex = &info->tx_buf_list_ex[i];
5037
5038 load_pci_memory(info, desc_ex->virt_addr,buf,copy_count);
5039
5040 desc->length = copy_count;
5041 desc->status = 0;
5042
5043 buf += copy_count;
5044 count -= copy_count;
5045
5046 if (!count)
5047 break;
5048
5049 i++;
5050 if (i >= info->tx_buf_count)
5051 i = 0;
5052 }
5053
5054 info->tx_buf_list[i].status = 0x81; /* set EOM and EOT status */
5055 info->last_tx_buf = ++i;
5056 }
5057
5058 static bool register_test(SLMP_INFO *info)
5059 {
5060 static unsigned char testval[] = {0x00, 0xff, 0xaa, 0x55, 0x69, 0x96};
5061 static unsigned int count = ARRAY_SIZE(testval);
5062 unsigned int i;
5063 bool rc = true;
5064 unsigned long flags;
5065
5066 spin_lock_irqsave(&info->lock,flags);
5067 reset_port(info);
5068
5069 /* assume failure */
5070 info->init_error = DiagStatus_AddressFailure;
5071
5072 /* Write bit patterns to various registers but do it out of */
5073 /* sync, then read back and verify values. */
5074
5075 for (i = 0 ; i < count ; i++) {
5076 write_reg(info, TMC, testval[i]);
5077 write_reg(info, IDL, testval[(i+1)%count]);
5078 write_reg(info, SA0, testval[(i+2)%count]);
5079 write_reg(info, SA1, testval[(i+3)%count]);
5080
5081 if ( (read_reg(info, TMC) != testval[i]) ||
5082 (read_reg(info, IDL) != testval[(i+1)%count]) ||
5083 (read_reg(info, SA0) != testval[(i+2)%count]) ||
5084 (read_reg(info, SA1) != testval[(i+3)%count]) )
5085 {
5086 rc = false;
5087 break;
5088 }
5089 }
5090
5091 reset_port(info);
5092 spin_unlock_irqrestore(&info->lock,flags);
5093
5094 return rc;
5095 }
5096
5097 static bool irq_test(SLMP_INFO *info)
5098 {
5099 unsigned long timeout;
5100 unsigned long flags;
5101
5102 unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0;
5103
5104 spin_lock_irqsave(&info->lock,flags);
5105 reset_port(info);
5106
5107 /* assume failure */
5108 info->init_error = DiagStatus_IrqFailure;
5109 info->irq_occurred = false;
5110
5111 /* setup timer0 on SCA0 to interrupt */
5112
5113 /* IER2<7..4> = timer<3..0> interrupt enables (1=enabled) */
5114 write_reg(info, IER2, (unsigned char)((info->port_num & 1) ? BIT6 : BIT4));
5115
5116 write_reg(info, (unsigned char)(timer + TEPR), 0); /* timer expand prescale */
5117 write_reg16(info, (unsigned char)(timer + TCONR), 1); /* timer constant */
5118
5119
5120 /* TMCS, Timer Control/Status Register
5121 *
5122 * 07 CMF, Compare match flag (read only) 1=match
5123 * 06 ECMI, CMF Interrupt Enable: 1=enabled
5124 * 05 Reserved, must be 0
5125 * 04 TME, Timer Enable
5126 * 03..00 Reserved, must be 0
5127 *
5128 * 0101 0000
5129 */
5130 write_reg(info, (unsigned char)(timer + TMCS), 0x50);
5131
5132 spin_unlock_irqrestore(&info->lock,flags);
5133
5134 timeout=100;
5135 while( timeout-- && !info->irq_occurred ) {
5136 msleep_interruptible(10);
5137 }
5138
5139 spin_lock_irqsave(&info->lock,flags);
5140 reset_port(info);
5141 spin_unlock_irqrestore(&info->lock,flags);
5142
5143 return info->irq_occurred;
5144 }
5145
5146 /* initialize individual SCA device (2 ports)
5147 */
5148 static bool sca_init(SLMP_INFO *info)
5149 {
5150 /* set wait controller to single mem partition (low), no wait states */
5151 write_reg(info, PABR0, 0); /* wait controller addr boundary 0 */
5152 write_reg(info, PABR1, 0); /* wait controller addr boundary 1 */
5153 write_reg(info, WCRL, 0); /* wait controller low range */
5154 write_reg(info, WCRM, 0); /* wait controller mid range */
5155 write_reg(info, WCRH, 0); /* wait controller high range */
5156
5157 /* DPCR, DMA Priority Control
5158 *
5159 * 07..05 Not used, must be 0
5160 * 04 BRC, bus release condition: 0=all transfers complete
5161 * 03 CCC, channel change condition: 0=every cycle
5162 * 02..00 PR<2..0>, priority 100=round robin
5163 *
5164 * 00000100 = 0x04
5165 */
5166 write_reg(info, DPCR, dma_priority);
5167
5168 /* DMA Master Enable, BIT7: 1=enable all channels */
5169 write_reg(info, DMER, 0x80);
5170
5171 /* enable all interrupt classes */
5172 write_reg(info, IER0, 0xff); /* TxRDY,RxRDY,TxINT,RxINT (ports 0-1) */
5173 write_reg(info, IER1, 0xff); /* DMIB,DMIA (channels 0-3) */
5174 write_reg(info, IER2, 0xf0); /* TIRQ (timers 0-3) */
5175
5176 /* ITCR, interrupt control register
5177 * 07 IPC, interrupt priority, 0=MSCI->DMA
5178 * 06..05 IAK<1..0>, Acknowledge cycle, 00=non-ack cycle
5179 * 04 VOS, Vector Output, 0=unmodified vector
5180 * 03..00 Reserved, must be 0
5181 */
5182 write_reg(info, ITCR, 0);
5183
5184 return true;
5185 }
5186
5187 /* initialize adapter hardware
5188 */
5189 static bool init_adapter(SLMP_INFO *info)
5190 {
5191 int i;
5192
5193 /* Set BIT30 of Local Control Reg 0x50 to reset SCA */
5194 volatile u32 *MiscCtrl = (u32 *)(info->lcr_base + 0x50);
5195 u32 readval;
5196
5197 info->misc_ctrl_value |= BIT30;
5198 *MiscCtrl = info->misc_ctrl_value;
5199
5200 /*
5201 * Force at least 170ns delay before clearing
5202 * reset bit. Each read from LCR takes at least
5203 * 30ns so 10 times for 300ns to be safe.
5204 */
5205 for(i=0;i<10;i++)
5206 readval = *MiscCtrl;
5207
5208 info->misc_ctrl_value &= ~BIT30;
5209 *MiscCtrl = info->misc_ctrl_value;
5210
5211 /* init control reg (all DTRs off, all clksel=input) */
5212 info->ctrlreg_value = 0xaa;
5213 write_control_reg(info);
5214
5215 {
5216 volatile u32 *LCR1BRDR = (u32 *)(info->lcr_base + 0x2c);
5217 lcr1_brdr_value &= ~(BIT5 + BIT4 + BIT3);
5218
5219 switch(read_ahead_count)
5220 {
5221 case 16:
5222 lcr1_brdr_value |= BIT5 + BIT4 + BIT3;
5223 break;
5224 case 8:
5225 lcr1_brdr_value |= BIT5 + BIT4;
5226 break;
5227 case 4:
5228 lcr1_brdr_value |= BIT5 + BIT3;
5229 break;
5230 case 0:
5231 lcr1_brdr_value |= BIT5;
5232 break;
5233 }
5234
5235 *LCR1BRDR = lcr1_brdr_value;
5236 *MiscCtrl = misc_ctrl_value;
5237 }
5238
5239 sca_init(info->port_array[0]);
5240 sca_init(info->port_array[2]);
5241
5242 return true;
5243 }
5244
5245 /* Loopback an HDLC frame to test the hardware
5246 * interrupt and DMA functions.
5247 */
5248 static bool loopback_test(SLMP_INFO *info)
5249 {
5250 #define TESTFRAMESIZE 20
5251
5252 unsigned long timeout;
5253 u16 count = TESTFRAMESIZE;
5254 unsigned char buf[TESTFRAMESIZE];
5255 bool rc = false;
5256 unsigned long flags;
5257
5258 struct tty_struct *oldtty = info->port.tty;
5259 u32 speed = info->params.clock_speed;
5260
5261 info->params.clock_speed = 3686400;
5262 info->port.tty = NULL;
5263
5264 /* assume failure */
5265 info->init_error = DiagStatus_DmaFailure;
5266
5267 /* build and send transmit frame */
5268 for (count = 0; count < TESTFRAMESIZE;++count)
5269 buf[count] = (unsigned char)count;
5270
5271 memset(info->tmp_rx_buf,0,TESTFRAMESIZE);
5272
5273 /* program hardware for HDLC and enabled receiver */
5274 spin_lock_irqsave(&info->lock,flags);
5275 hdlc_mode(info);
5276 enable_loopback(info,1);
5277 rx_start(info);
5278 info->tx_count = count;
5279 tx_load_dma_buffer(info,buf,count);
5280 tx_start(info);
5281 spin_unlock_irqrestore(&info->lock,flags);
5282
5283 /* wait for receive complete */
5284 /* Set a timeout for waiting for interrupt. */
5285 for ( timeout = 100; timeout; --timeout ) {
5286 msleep_interruptible(10);
5287
5288 if (rx_get_frame(info)) {
5289 rc = true;
5290 break;
5291 }
5292 }
5293
5294 /* verify received frame length and contents */
5295 if (rc &&
5296 ( info->tmp_rx_buf_count != count ||
5297 memcmp(buf, info->tmp_rx_buf,count))) {
5298 rc = false;
5299 }
5300
5301 spin_lock_irqsave(&info->lock,flags);
5302 reset_adapter(info);
5303 spin_unlock_irqrestore(&info->lock,flags);
5304
5305 info->params.clock_speed = speed;
5306 info->port.tty = oldtty;
5307
5308 return rc;
5309 }
5310
5311 /* Perform diagnostics on hardware
5312 */
5313 static int adapter_test( SLMP_INFO *info )
5314 {
5315 unsigned long flags;
5316 if ( debug_level >= DEBUG_LEVEL_INFO )
5317 printk( "%s(%d):Testing device %s\n",
5318 __FILE__,__LINE__,info->device_name );
5319
5320 spin_lock_irqsave(&info->lock,flags);
5321 init_adapter(info);
5322 spin_unlock_irqrestore(&info->lock,flags);
5323
5324 info->port_array[0]->port_count = 0;
5325
5326 if ( register_test(info->port_array[0]) &&
5327 register_test(info->port_array[1])) {
5328
5329 info->port_array[0]->port_count = 2;
5330
5331 if ( register_test(info->port_array[2]) &&
5332 register_test(info->port_array[3]) )
5333 info->port_array[0]->port_count += 2;
5334 }
5335 else {
5336 printk( "%s(%d):Register test failure for device %s Addr=%08lX\n",
5337 __FILE__,__LINE__,info->device_name, (unsigned long)(info->phys_sca_base));
5338 return -ENODEV;
5339 }
5340
5341 if ( !irq_test(info->port_array[0]) ||
5342 !irq_test(info->port_array[1]) ||
5343 (info->port_count == 4 && !irq_test(info->port_array[2])) ||
5344 (info->port_count == 4 && !irq_test(info->port_array[3]))) {
5345 printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
5346 __FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
5347 return -ENODEV;
5348 }
5349
5350 if (!loopback_test(info->port_array[0]) ||
5351 !loopback_test(info->port_array[1]) ||
5352 (info->port_count == 4 && !loopback_test(info->port_array[2])) ||
5353 (info->port_count == 4 && !loopback_test(info->port_array[3]))) {
5354 printk( "%s(%d):DMA test failure for device %s\n",
5355 __FILE__,__LINE__,info->device_name);
5356 return -ENODEV;
5357 }
5358
5359 if ( debug_level >= DEBUG_LEVEL_INFO )
5360 printk( "%s(%d):device %s passed diagnostics\n",
5361 __FILE__,__LINE__,info->device_name );
5362
5363 info->port_array[0]->init_error = 0;
5364 info->port_array[1]->init_error = 0;
5365 if ( info->port_count > 2 ) {
5366 info->port_array[2]->init_error = 0;
5367 info->port_array[3]->init_error = 0;
5368 }
5369
5370 return 0;
5371 }
5372
5373 /* Test the shared memory on a PCI adapter.
5374 */
5375 static bool memory_test(SLMP_INFO *info)
5376 {
5377 static unsigned long testval[] = { 0x0, 0x55555555, 0xaaaaaaaa,
5378 0x66666666, 0x99999999, 0xffffffff, 0x12345678 };
5379 unsigned long count = ARRAY_SIZE(testval);
5380 unsigned long i;
5381 unsigned long limit = SCA_MEM_SIZE/sizeof(unsigned long);
5382 unsigned long * addr = (unsigned long *)info->memory_base;
5383
5384 /* Test data lines with test pattern at one location. */
5385
5386 for ( i = 0 ; i < count ; i++ ) {
5387 *addr = testval[i];
5388 if ( *addr != testval[i] )
5389 return false;
5390 }
5391
5392 /* Test address lines with incrementing pattern over */
5393 /* entire address range. */
5394
5395 for ( i = 0 ; i < limit ; i++ ) {
5396 *addr = i * 4;
5397 addr++;
5398 }
5399
5400 addr = (unsigned long *)info->memory_base;
5401
5402 for ( i = 0 ; i < limit ; i++ ) {
5403 if ( *addr != i * 4 )
5404 return false;
5405 addr++;
5406 }
5407
5408 memset( info->memory_base, 0, SCA_MEM_SIZE );
5409 return true;
5410 }
5411
5412 /* Load data into PCI adapter shared memory.
5413 *
5414 * The PCI9050 releases control of the local bus
5415 * after completing the current read or write operation.
5416 *
5417 * While the PCI9050 write FIFO not empty, the
5418 * PCI9050 treats all of the writes as a single transaction
5419 * and does not release the bus. This causes DMA latency problems
5420 * at high speeds when copying large data blocks to the shared memory.
5421 *
5422 * This function breaks a write into multiple transations by
5423 * interleaving a read which flushes the write FIFO and 'completes'
5424 * the write transation. This allows any pending DMA request to gain control
5425 * of the local bus in a timely fasion.
5426 */
5427 static void load_pci_memory(SLMP_INFO *info, char* dest, const char* src, unsigned short count)
5428 {
5429 /* A load interval of 16 allows for 4 32-bit writes at */
5430 /* 136ns each for a maximum latency of 542ns on the local bus.*/
5431
5432 unsigned short interval = count / sca_pci_load_interval;
5433 unsigned short i;
5434
5435 for ( i = 0 ; i < interval ; i++ )
5436 {
5437 memcpy(dest, src, sca_pci_load_interval);
5438 read_status_reg(info);
5439 dest += sca_pci_load_interval;
5440 src += sca_pci_load_interval;
5441 }
5442
5443 memcpy(dest, src, count % sca_pci_load_interval);
5444 }
5445
5446 static void trace_block(SLMP_INFO *info,const char* data, int count, int xmit)
5447 {
5448 int i;
5449 int linecount;
5450 if (xmit)
5451 printk("%s tx data:\n",info->device_name);
5452 else
5453 printk("%s rx data:\n",info->device_name);
5454
5455 while(count) {
5456 if (count > 16)
5457 linecount = 16;
5458 else
5459 linecount = count;
5460
5461 for(i=0;i<linecount;i++)
5462 printk("%02X ",(unsigned char)data[i]);
5463 for(;i<17;i++)
5464 printk(" ");
5465 for(i=0;i<linecount;i++) {
5466 if (data[i]>=040 && data[i]<=0176)
5467 printk("%c",data[i]);
5468 else
5469 printk(".");
5470 }
5471 printk("\n");
5472
5473 data += linecount;
5474 count -= linecount;
5475 }
5476 } /* end of trace_block() */
5477
5478 /* called when HDLC frame times out
5479 * update stats and do tx completion processing
5480 */
5481 static void tx_timeout(unsigned long context)
5482 {
5483 SLMP_INFO *info = (SLMP_INFO*)context;
5484 unsigned long flags;
5485
5486 if ( debug_level >= DEBUG_LEVEL_INFO )
5487 printk( "%s(%d):%s tx_timeout()\n",
5488 __FILE__,__LINE__,info->device_name);
5489 if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) {
5490 info->icount.txtimeout++;
5491 }
5492 spin_lock_irqsave(&info->lock,flags);
5493 info->tx_active = false;
5494 info->tx_count = info->tx_put = info->tx_get = 0;
5495
5496 spin_unlock_irqrestore(&info->lock,flags);
5497
5498 #if SYNCLINK_GENERIC_HDLC
5499 if (info->netcount)
5500 hdlcdev_tx_done(info);
5501 else
5502 #endif
5503 bh_transmit(info);
5504 }
5505
5506 /* called to periodically check the DSR/RI modem signal input status
5507 */
5508 static void status_timeout(unsigned long context)
5509 {
5510 u16 status = 0;
5511 SLMP_INFO *info = (SLMP_INFO*)context;
5512 unsigned long flags;
5513 unsigned char delta;
5514
5515
5516 spin_lock_irqsave(&info->lock,flags);
5517 get_signals(info);
5518 spin_unlock_irqrestore(&info->lock,flags);
5519
5520 /* check for DSR/RI state change */
5521
5522 delta = info->old_signals ^ info->serial_signals;
5523 info->old_signals = info->serial_signals;
5524
5525 if (delta & SerialSignal_DSR)
5526 status |= MISCSTATUS_DSR_LATCHED|(info->serial_signals&SerialSignal_DSR);
5527
5528 if (delta & SerialSignal_RI)
5529 status |= MISCSTATUS_RI_LATCHED|(info->serial_signals&SerialSignal_RI);
5530
5531 if (delta & SerialSignal_DCD)
5532 status |= MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD);
5533
5534 if (delta & SerialSignal_CTS)
5535 status |= MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS);
5536
5537 if (status)
5538 isr_io_pin(info,status);
5539
5540 mod_timer(&info->status_timer, jiffies + msecs_to_jiffies(10));
5541 }
5542
5543
5544 /* Register Access Routines -
5545 * All registers are memory mapped
5546 */
5547 #define CALC_REGADDR() \
5548 unsigned char * RegAddr = (unsigned char*)(info->sca_base + Addr); \
5549 if (info->port_num > 1) \
5550 RegAddr += 256; /* port 0-1 SCA0, 2-3 SCA1 */ \
5551 if ( info->port_num & 1) { \
5552 if (Addr > 0x7f) \
5553 RegAddr += 0x40; /* DMA access */ \
5554 else if (Addr > 0x1f && Addr < 0x60) \
5555 RegAddr += 0x20; /* MSCI access */ \
5556 }
5557
5558
5559 static unsigned char read_reg(SLMP_INFO * info, unsigned char Addr)
5560 {
5561 CALC_REGADDR();
5562 return *RegAddr;
5563 }
5564 static void write_reg(SLMP_INFO * info, unsigned char Addr, unsigned char Value)
5565 {
5566 CALC_REGADDR();
5567 *RegAddr = Value;
5568 }
5569
5570 static u16 read_reg16(SLMP_INFO * info, unsigned char Addr)
5571 {
5572 CALC_REGADDR();
5573 return *((u16 *)RegAddr);
5574 }
5575
5576 static void write_reg16(SLMP_INFO * info, unsigned char Addr, u16 Value)
5577 {
5578 CALC_REGADDR();
5579 *((u16 *)RegAddr) = Value;
5580 }
5581
5582 static unsigned char read_status_reg(SLMP_INFO * info)
5583 {
5584 unsigned char *RegAddr = (unsigned char *)info->statctrl_base;
5585 return *RegAddr;
5586 }
5587
5588 static void write_control_reg(SLMP_INFO * info)
5589 {
5590 unsigned char *RegAddr = (unsigned char *)info->statctrl_base;
5591 *RegAddr = info->port_array[0]->ctrlreg_value;
5592 }
5593
5594
5595 static int synclinkmp_init_one (struct pci_dev *dev,
5596 const struct pci_device_id *ent)
5597 {
5598 if (pci_enable_device(dev)) {
5599 printk("error enabling pci device %p\n", dev);
5600 return -EIO;
5601 }
5602 device_init( ++synclinkmp_adapter_count, dev );
5603 return 0;
5604 }
5605
5606 static void synclinkmp_remove_one (struct pci_dev *dev)
5607 {
5608 }
CRIS linux kernel tree