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net/mlx5e: Fix wrong indications in DIM due to counter wraparound
[linux/fpc-iii.git] / drivers / tty / synclink_gt.c
blob7aca2d4670e4a3aaf3636acc5f8dd1c3f288bfd3
1 /*
2 * Device driver for Microgate SyncLink GT serial adapters.
3 *
4 * written by Paul Fulghum for Microgate Corporation
5 * paulkf@microgate.com
6 *
7 * Microgate and SyncLink are trademarks of Microgate Corporation
8 *
9 * This code is released under the GNU General Public License (GPL)
10 *
11 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
12 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
13 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
14 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
15 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
16 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
17 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
18 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
19 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
20 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
21 * OF THE POSSIBILITY OF SUCH DAMAGE.
22 */
23
24 /*
25 * DEBUG OUTPUT DEFINITIONS
26 *
27 * uncomment lines below to enable specific types of debug output
28 *
29 * DBGINFO information - most verbose output
30 * DBGERR serious errors
31 * DBGBH bottom half service routine debugging
32 * DBGISR interrupt service routine debugging
33 * DBGDATA output receive and transmit data
34 * DBGTBUF output transmit DMA buffers and registers
35 * DBGRBUF output receive DMA buffers and registers
36 */
37
38 #define DBGINFO(fmt) if (debug_level >= DEBUG_LEVEL_INFO) printk fmt
39 #define DBGERR(fmt) if (debug_level >= DEBUG_LEVEL_ERROR) printk fmt
40 #define DBGBH(fmt) if (debug_level >= DEBUG_LEVEL_BH) printk fmt
41 #define DBGISR(fmt) if (debug_level >= DEBUG_LEVEL_ISR) printk fmt
42 #define DBGDATA(info, buf, size, label) if (debug_level >= DEBUG_LEVEL_DATA) trace_block((info), (buf), (size), (label))
43 /*#define DBGTBUF(info) dump_tbufs(info)*/
44 /*#define DBGRBUF(info) dump_rbufs(info)*/
45
46
47 #include <linux/module.h>
48 #include <linux/errno.h>
49 #include <linux/signal.h>
50 #include <linux/sched.h>
51 #include <linux/timer.h>
52 #include <linux/interrupt.h>
53 #include <linux/pci.h>
54 #include <linux/tty.h>
55 #include <linux/tty_flip.h>
56 #include <linux/serial.h>
57 #include <linux/major.h>
58 #include <linux/string.h>
59 #include <linux/fcntl.h>
60 #include <linux/ptrace.h>
61 #include <linux/ioport.h>
62 #include <linux/mm.h>
63 #include <linux/seq_file.h>
64 #include <linux/slab.h>
65 #include <linux/netdevice.h>
66 #include <linux/vmalloc.h>
67 #include <linux/init.h>
68 #include <linux/delay.h>
69 #include <linux/ioctl.h>
70 #include <linux/termios.h>
71 #include <linux/bitops.h>
72 #include <linux/workqueue.h>
73 #include <linux/hdlc.h>
74 #include <linux/synclink.h>
75
76 #include <asm/io.h>
77 #include <asm/irq.h>
78 #include <asm/dma.h>
79 #include <asm/types.h>
80 #include <asm/uaccess.h>
81
82 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_GT_MODULE))
83 #define SYNCLINK_GENERIC_HDLC 1
84 #else
85 #define SYNCLINK_GENERIC_HDLC 0
86 #endif
87
88 /*
89 * module identification
90 */
91 static char *driver_name = "SyncLink GT";
92 static char *slgt_driver_name = "synclink_gt";
93 static char *tty_dev_prefix = "ttySLG";
94 MODULE_LICENSE("GPL");
95 #define MGSL_MAGIC 0x5401
96 #define MAX_DEVICES 32
97
98 static struct pci_device_id pci_table[] = {
99 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
100 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT2_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
101 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT4_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
102 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_AC_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
103 {0,}, /* terminate list */
104 };
105 MODULE_DEVICE_TABLE(pci, pci_table);
106
107 static int init_one(struct pci_dev *dev,const struct pci_device_id *ent);
108 static void remove_one(struct pci_dev *dev);
109 static struct pci_driver pci_driver = {
110 .name = "synclink_gt",
111 .id_table = pci_table,
112 .probe = init_one,
113 .remove = remove_one,
114 };
115
116 static bool pci_registered;
117
118 /*
119 * module configuration and status
120 */
121 static struct slgt_info *slgt_device_list;
122 static int slgt_device_count;
123
124 static int ttymajor;
125 static int debug_level;
126 static int maxframe[MAX_DEVICES];
127
128 module_param(ttymajor, int, 0);
129 module_param(debug_level, int, 0);
130 module_param_array(maxframe, int, NULL, 0);
131
132 MODULE_PARM_DESC(ttymajor, "TTY major device number override: 0=auto assigned");
133 MODULE_PARM_DESC(debug_level, "Debug syslog output: 0=disabled, 1 to 5=increasing detail");
134 MODULE_PARM_DESC(maxframe, "Maximum frame size used by device (4096 to 65535)");
135
136 /*
137 * tty support and callbacks
138 */
139 static struct tty_driver *serial_driver;
140
141 static int open(struct tty_struct *tty, struct file * filp);
142 static void close(struct tty_struct *tty, struct file * filp);
143 static void hangup(struct tty_struct *tty);
144 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios);
145
146 static int write(struct tty_struct *tty, const unsigned char *buf, int count);
147 static int put_char(struct tty_struct *tty, unsigned char ch);
148 static void send_xchar(struct tty_struct *tty, char ch);
149 static void wait_until_sent(struct tty_struct *tty, int timeout);
150 static int write_room(struct tty_struct *tty);
151 static void flush_chars(struct tty_struct *tty);
152 static void flush_buffer(struct tty_struct *tty);
153 static void tx_hold(struct tty_struct *tty);
154 static void tx_release(struct tty_struct *tty);
155
156 static int ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg);
157 static int chars_in_buffer(struct tty_struct *tty);
158 static void throttle(struct tty_struct * tty);
159 static void unthrottle(struct tty_struct * tty);
160 static int set_break(struct tty_struct *tty, int break_state);
161
162 /*
163 * generic HDLC support and callbacks
164 */
165 #if SYNCLINK_GENERIC_HDLC
166 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
167 static void hdlcdev_tx_done(struct slgt_info *info);
168 static void hdlcdev_rx(struct slgt_info *info, char *buf, int size);
169 static int hdlcdev_init(struct slgt_info *info);
170 static void hdlcdev_exit(struct slgt_info *info);
171 #endif
172
173
174 /*
175 * device specific structures, macros and functions
176 */
177
178 #define SLGT_MAX_PORTS 4
179 #define SLGT_REG_SIZE 256
180
181 /*
182 * conditional wait facility
183 */
184 struct cond_wait {
185 struct cond_wait *next;
186 wait_queue_head_t q;
187 wait_queue_t wait;
188 unsigned int data;
189 };
190 static void init_cond_wait(struct cond_wait *w, unsigned int data);
191 static void add_cond_wait(struct cond_wait **head, struct cond_wait *w);
192 static void remove_cond_wait(struct cond_wait **head, struct cond_wait *w);
193 static void flush_cond_wait(struct cond_wait **head);
194
195 /*
196 * DMA buffer descriptor and access macros
197 */
198 struct slgt_desc
199 {
200 __le16 count;
201 __le16 status;
202 __le32 pbuf; /* physical address of data buffer */
203 __le32 next; /* physical address of next descriptor */
204
205 /* driver book keeping */
206 char *buf; /* virtual address of data buffer */
207 unsigned int pdesc; /* physical address of this descriptor */
208 dma_addr_t buf_dma_addr;
209 unsigned short buf_count;
210 };
211
212 #define set_desc_buffer(a,b) (a).pbuf = cpu_to_le32((unsigned int)(b))
213 #define set_desc_next(a,b) (a).next = cpu_to_le32((unsigned int)(b))
214 #define set_desc_count(a,b)(a).count = cpu_to_le16((unsigned short)(b))
215 #define set_desc_eof(a,b) (a).status = cpu_to_le16((b) ? (le16_to_cpu((a).status) | BIT0) : (le16_to_cpu((a).status) & ~BIT0))
216 #define set_desc_status(a, b) (a).status = cpu_to_le16((unsigned short)(b))
217 #define desc_count(a) (le16_to_cpu((a).count))
218 #define desc_status(a) (le16_to_cpu((a).status))
219 #define desc_complete(a) (le16_to_cpu((a).status) & BIT15)
220 #define desc_eof(a) (le16_to_cpu((a).status) & BIT2)
221 #define desc_crc_error(a) (le16_to_cpu((a).status) & BIT1)
222 #define desc_abort(a) (le16_to_cpu((a).status) & BIT0)
223 #define desc_residue(a) ((le16_to_cpu((a).status) & 0x38) >> 3)
224
225 struct _input_signal_events {
226 int ri_up;
227 int ri_down;
228 int dsr_up;
229 int dsr_down;
230 int dcd_up;
231 int dcd_down;
232 int cts_up;
233 int cts_down;
234 };
235
236 /*
237 * device instance data structure
238 */
239 struct slgt_info {
240 void *if_ptr; /* General purpose pointer (used by SPPP) */
241 struct tty_port port;
242
243 struct slgt_info *next_device; /* device list link */
244
245 int magic;
246
247 char device_name[25];
248 struct pci_dev *pdev;
249
250 int port_count; /* count of ports on adapter */
251 int adapter_num; /* adapter instance number */
252 int port_num; /* port instance number */
253
254 /* array of pointers to port contexts on this adapter */
255 struct slgt_info *port_array[SLGT_MAX_PORTS];
256
257 int line; /* tty line instance number */
258
259 struct mgsl_icount icount;
260
261 int timeout;
262 int x_char; /* xon/xoff character */
263 unsigned int read_status_mask;
264 unsigned int ignore_status_mask;
265
266 wait_queue_head_t status_event_wait_q;
267 wait_queue_head_t event_wait_q;
268 struct timer_list tx_timer;
269 struct timer_list rx_timer;
270
271 unsigned int gpio_present;
272 struct cond_wait *gpio_wait_q;
273
274 spinlock_t lock; /* spinlock for synchronizing with ISR */
275
276 struct work_struct task;
277 u32 pending_bh;
278 bool bh_requested;
279 bool bh_running;
280
281 int isr_overflow;
282 bool irq_requested; /* true if IRQ requested */
283 bool irq_occurred; /* for diagnostics use */
284
285 /* device configuration */
286
287 unsigned int bus_type;
288 unsigned int irq_level;
289 unsigned long irq_flags;
290
291 unsigned char __iomem * reg_addr; /* memory mapped registers address */
292 u32 phys_reg_addr;
293 bool reg_addr_requested;
294
295 MGSL_PARAMS params; /* communications parameters */
296 u32 idle_mode;
297 u32 max_frame_size; /* as set by device config */
298
299 unsigned int rbuf_fill_level;
300 unsigned int rx_pio;
301 unsigned int if_mode;
302 unsigned int base_clock;
303 unsigned int xsync;
304 unsigned int xctrl;
305
306 /* device status */
307
308 bool rx_enabled;
309 bool rx_restart;
310
311 bool tx_enabled;
312 bool tx_active;
313
314 unsigned char signals; /* serial signal states */
315 int init_error; /* initialization error */
316
317 unsigned char *tx_buf;
318 int tx_count;
319
320 char *flag_buf;
321 bool drop_rts_on_tx_done;
322 struct _input_signal_events input_signal_events;
323
324 int dcd_chkcount; /* check counts to prevent */
325 int cts_chkcount; /* too many IRQs if a signal */
326 int dsr_chkcount; /* is floating */
327 int ri_chkcount;
328
329 char *bufs; /* virtual address of DMA buffer lists */
330 dma_addr_t bufs_dma_addr; /* physical address of buffer descriptors */
331
332 unsigned int rbuf_count;
333 struct slgt_desc *rbufs;
334 unsigned int rbuf_current;
335 unsigned int rbuf_index;
336 unsigned int rbuf_fill_index;
337 unsigned short rbuf_fill_count;
338
339 unsigned int tbuf_count;
340 struct slgt_desc *tbufs;
341 unsigned int tbuf_current;
342 unsigned int tbuf_start;
343
344 unsigned char *tmp_rbuf;
345 unsigned int tmp_rbuf_count;
346
347 /* SPPP/Cisco HDLC device parts */
348
349 int netcount;
350 spinlock_t netlock;
351 #if SYNCLINK_GENERIC_HDLC
352 struct net_device *netdev;
353 #endif
354
355 };
356
357 static MGSL_PARAMS default_params = {
358 .mode = MGSL_MODE_HDLC,
359 .loopback = 0,
360 .flags = HDLC_FLAG_UNDERRUN_ABORT15,
361 .encoding = HDLC_ENCODING_NRZI_SPACE,
362 .clock_speed = 0,
363 .addr_filter = 0xff,
364 .crc_type = HDLC_CRC_16_CCITT,
365 .preamble_length = HDLC_PREAMBLE_LENGTH_8BITS,
366 .preamble = HDLC_PREAMBLE_PATTERN_NONE,
367 .data_rate = 9600,
368 .data_bits = 8,
369 .stop_bits = 1,
370 .parity = ASYNC_PARITY_NONE
371 };
372
373
374 #define BH_RECEIVE 1
375 #define BH_TRANSMIT 2
376 #define BH_STATUS 4
377 #define IO_PIN_SHUTDOWN_LIMIT 100
378
379 #define DMABUFSIZE 256
380 #define DESC_LIST_SIZE 4096
381
382 #define MASK_PARITY BIT1
383 #define MASK_FRAMING BIT0
384 #define MASK_BREAK BIT14
385 #define MASK_OVERRUN BIT4
386
387 #define GSR 0x00 /* global status */
388 #define JCR 0x04 /* JTAG control */
389 #define IODR 0x08 /* GPIO direction */
390 #define IOER 0x0c /* GPIO interrupt enable */
391 #define IOVR 0x10 /* GPIO value */
392 #define IOSR 0x14 /* GPIO interrupt status */
393 #define TDR 0x80 /* tx data */
394 #define RDR 0x80 /* rx data */
395 #define TCR 0x82 /* tx control */
396 #define TIR 0x84 /* tx idle */
397 #define TPR 0x85 /* tx preamble */
398 #define RCR 0x86 /* rx control */
399 #define VCR 0x88 /* V.24 control */
400 #define CCR 0x89 /* clock control */
401 #define BDR 0x8a /* baud divisor */
402 #define SCR 0x8c /* serial control */
403 #define SSR 0x8e /* serial status */
404 #define RDCSR 0x90 /* rx DMA control/status */
405 #define TDCSR 0x94 /* tx DMA control/status */
406 #define RDDAR 0x98 /* rx DMA descriptor address */
407 #define TDDAR 0x9c /* tx DMA descriptor address */
408 #define XSR 0x40 /* extended sync pattern */
409 #define XCR 0x44 /* extended control */
410
411 #define RXIDLE BIT14
412 #define RXBREAK BIT14
413 #define IRQ_TXDATA BIT13
414 #define IRQ_TXIDLE BIT12
415 #define IRQ_TXUNDER BIT11 /* HDLC */
416 #define IRQ_RXDATA BIT10
417 #define IRQ_RXIDLE BIT9 /* HDLC */
418 #define IRQ_RXBREAK BIT9 /* async */
419 #define IRQ_RXOVER BIT8
420 #define IRQ_DSR BIT7
421 #define IRQ_CTS BIT6
422 #define IRQ_DCD BIT5
423 #define IRQ_RI BIT4
424 #define IRQ_ALL 0x3ff0
425 #define IRQ_MASTER BIT0
426
427 #define slgt_irq_on(info, mask) \
428 wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) | (mask)))
429 #define slgt_irq_off(info, mask) \
430 wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) & ~(mask)))
431
432 static __u8 rd_reg8(struct slgt_info *info, unsigned int addr);
433 static void wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value);
434 static __u16 rd_reg16(struct slgt_info *info, unsigned int addr);
435 static void wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value);
436 static __u32 rd_reg32(struct slgt_info *info, unsigned int addr);
437 static void wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value);
438
439 static void msc_set_vcr(struct slgt_info *info);
440
441 static int startup(struct slgt_info *info);
442 static int block_til_ready(struct tty_struct *tty, struct file * filp,struct slgt_info *info);
443 static void shutdown(struct slgt_info *info);
444 static void program_hw(struct slgt_info *info);
445 static void change_params(struct slgt_info *info);
446
447 static int register_test(struct slgt_info *info);
448 static int irq_test(struct slgt_info *info);
449 static int loopback_test(struct slgt_info *info);
450 static int adapter_test(struct slgt_info *info);
451
452 static void reset_adapter(struct slgt_info *info);
453 static void reset_port(struct slgt_info *info);
454 static void async_mode(struct slgt_info *info);
455 static void sync_mode(struct slgt_info *info);
456
457 static void rx_stop(struct slgt_info *info);
458 static void rx_start(struct slgt_info *info);
459 static void reset_rbufs(struct slgt_info *info);
460 static void free_rbufs(struct slgt_info *info, unsigned int first, unsigned int last);
461 static void rdma_reset(struct slgt_info *info);
462 static bool rx_get_frame(struct slgt_info *info);
463 static bool rx_get_buf(struct slgt_info *info);
464
465 static void tx_start(struct slgt_info *info);
466 static void tx_stop(struct slgt_info *info);
467 static void tx_set_idle(struct slgt_info *info);
468 static unsigned int free_tbuf_count(struct slgt_info *info);
469 static unsigned int tbuf_bytes(struct slgt_info *info);
470 static void reset_tbufs(struct slgt_info *info);
471 static void tdma_reset(struct slgt_info *info);
472 static bool tx_load(struct slgt_info *info, const char *buf, unsigned int count);
473
474 static void get_signals(struct slgt_info *info);
475 static void set_signals(struct slgt_info *info);
476 static void enable_loopback(struct slgt_info *info);
477 static void set_rate(struct slgt_info *info, u32 data_rate);
478
479 static int bh_action(struct slgt_info *info);
480 static void bh_handler(struct work_struct *work);
481 static void bh_transmit(struct slgt_info *info);
482 static void isr_serial(struct slgt_info *info);
483 static void isr_rdma(struct slgt_info *info);
484 static void isr_txeom(struct slgt_info *info, unsigned short status);
485 static void isr_tdma(struct slgt_info *info);
486
487 static int alloc_dma_bufs(struct slgt_info *info);
488 static void free_dma_bufs(struct slgt_info *info);
489 static int alloc_desc(struct slgt_info *info);
490 static void free_desc(struct slgt_info *info);
491 static int alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
492 static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
493
494 static int alloc_tmp_rbuf(struct slgt_info *info);
495 static void free_tmp_rbuf(struct slgt_info *info);
496
497 static void tx_timeout(unsigned long context);
498 static void rx_timeout(unsigned long context);
499
500 /*
501 * ioctl handlers
502 */
503 static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount);
504 static int get_params(struct slgt_info *info, MGSL_PARAMS __user *params);
505 static int set_params(struct slgt_info *info, MGSL_PARAMS __user *params);
506 static int get_txidle(struct slgt_info *info, int __user *idle_mode);
507 static int set_txidle(struct slgt_info *info, int idle_mode);
508 static int tx_enable(struct slgt_info *info, int enable);
509 static int tx_abort(struct slgt_info *info);
510 static int rx_enable(struct slgt_info *info, int enable);
511 static int modem_input_wait(struct slgt_info *info,int arg);
512 static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr);
513 static int tiocmget(struct tty_struct *tty);
514 static int tiocmset(struct tty_struct *tty,
515 unsigned int set, unsigned int clear);
516 static int set_break(struct tty_struct *tty, int break_state);
517 static int get_interface(struct slgt_info *info, int __user *if_mode);
518 static int set_interface(struct slgt_info *info, int if_mode);
519 static int set_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
520 static int get_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
521 static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
522 static int get_xsync(struct slgt_info *info, int __user *if_mode);
523 static int set_xsync(struct slgt_info *info, int if_mode);
524 static int get_xctrl(struct slgt_info *info, int __user *if_mode);
525 static int set_xctrl(struct slgt_info *info, int if_mode);
526
527 /*
528 * driver functions
529 */
530 static void add_device(struct slgt_info *info);
531 static void device_init(int adapter_num, struct pci_dev *pdev);
532 static int claim_resources(struct slgt_info *info);
533 static void release_resources(struct slgt_info *info);
534
535 /*
536 * DEBUG OUTPUT CODE
537 */
538 #ifndef DBGINFO
539 #define DBGINFO(fmt)
540 #endif
541 #ifndef DBGERR
542 #define DBGERR(fmt)
543 #endif
544 #ifndef DBGBH
545 #define DBGBH(fmt)
546 #endif
547 #ifndef DBGISR
548 #define DBGISR(fmt)
549 #endif
550
551 #ifdef DBGDATA
552 static void trace_block(struct slgt_info *info, const char *data, int count, const char *label)
553 {
554 int i;
555 int linecount;
556 printk("%s %s data:\n",info->device_name, label);
557 while(count) {
558 linecount = (count > 16) ? 16 : count;
559 for(i=0; i < linecount; i++)
560 printk("%02X ",(unsigned char)data[i]);
561 for(;i<17;i++)
562 printk(" ");
563 for(i=0;i<linecount;i++) {
564 if (data[i]>=040 && data[i]<=0176)
565 printk("%c",data[i]);
566 else
567 printk(".");
568 }
569 printk("\n");
570 data += linecount;
571 count -= linecount;
572 }
573 }
574 #else
575 #define DBGDATA(info, buf, size, label)
576 #endif
577
578 #ifdef DBGTBUF
579 static void dump_tbufs(struct slgt_info *info)
580 {
581 int i;
582 printk("tbuf_current=%d\n", info->tbuf_current);
583 for (i=0 ; i < info->tbuf_count ; i++) {
584 printk("%d: count=%04X status=%04X\n",
585 i, le16_to_cpu(info->tbufs[i].count), le16_to_cpu(info->tbufs[i].status));
586 }
587 }
588 #else
589 #define DBGTBUF(info)
590 #endif
591
592 #ifdef DBGRBUF
593 static void dump_rbufs(struct slgt_info *info)
594 {
595 int i;
596 printk("rbuf_current=%d\n", info->rbuf_current);
597 for (i=0 ; i < info->rbuf_count ; i++) {
598 printk("%d: count=%04X status=%04X\n",
599 i, le16_to_cpu(info->rbufs[i].count), le16_to_cpu(info->rbufs[i].status));
600 }
601 }
602 #else
603 #define DBGRBUF(info)
604 #endif
605
606 static inline int sanity_check(struct slgt_info *info, char *devname, const char *name)
607 {
608 #ifdef SANITY_CHECK
609 if (!info) {
610 printk("null struct slgt_info for (%s) in %s\n", devname, name);
611 return 1;
612 }
613 if (info->magic != MGSL_MAGIC) {
614 printk("bad magic number struct slgt_info (%s) in %s\n", devname, name);
615 return 1;
616 }
617 #else
618 if (!info)
619 return 1;
620 #endif
621 return 0;
622 }
623
624 /**
625 * line discipline callback wrappers
626 *
627 * The wrappers maintain line discipline references
628 * while calling into the line discipline.
629 *
630 * ldisc_receive_buf - pass receive data to line discipline
631 */
632 static void ldisc_receive_buf(struct tty_struct *tty,
633 const __u8 *data, char *flags, int count)
634 {
635 struct tty_ldisc *ld;
636 if (!tty)
637 return;
638 ld = tty_ldisc_ref(tty);
639 if (ld) {
640 if (ld->ops->receive_buf)
641 ld->ops->receive_buf(tty, data, flags, count);
642 tty_ldisc_deref(ld);
643 }
644 }
645
646 /* tty callbacks */
647
648 static int open(struct tty_struct *tty, struct file *filp)
649 {
650 struct slgt_info *info;
651 int retval, line;
652 unsigned long flags;
653
654 line = tty->index;
655 if (line >= slgt_device_count) {
656 DBGERR(("%s: open with invalid line #%d.\n", driver_name, line));
657 return -ENODEV;
658 }
659
660 info = slgt_device_list;
661 while(info && info->line != line)
662 info = info->next_device;
663 if (sanity_check(info, tty->name, "open"))
664 return -ENODEV;
665 if (info->init_error) {
666 DBGERR(("%s init error=%d\n", info->device_name, info->init_error));
667 return -ENODEV;
668 }
669
670 tty->driver_data = info;
671 info->port.tty = tty;
672
673 DBGINFO(("%s open, old ref count = %d\n", info->device_name, info->port.count));
674
675 mutex_lock(&info->port.mutex);
676 info->port.low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
677
678 spin_lock_irqsave(&info->netlock, flags);
679 if (info->netcount) {
680 retval = -EBUSY;
681 spin_unlock_irqrestore(&info->netlock, flags);
682 mutex_unlock(&info->port.mutex);
683 goto cleanup;
684 }
685 info->port.count++;
686 spin_unlock_irqrestore(&info->netlock, flags);
687
688 if (info->port.count == 1) {
689 /* 1st open on this device, init hardware */
690 retval = startup(info);
691 if (retval < 0) {
692 mutex_unlock(&info->port.mutex);
693 goto cleanup;
694 }
695 }
696 mutex_unlock(&info->port.mutex);
697 retval = block_til_ready(tty, filp, info);
698 if (retval) {
699 DBGINFO(("%s block_til_ready rc=%d\n", info->device_name, retval));
700 goto cleanup;
701 }
702
703 retval = 0;
704
705 cleanup:
706 if (retval) {
707 if (tty->count == 1)
708 info->port.tty = NULL; /* tty layer will release tty struct */
709 if(info->port.count)
710 info->port.count--;
711 }
712
713 DBGINFO(("%s open rc=%d\n", info->device_name, retval));
714 return retval;
715 }
716
717 static void close(struct tty_struct *tty, struct file *filp)
718 {
719 struct slgt_info *info = tty->driver_data;
720
721 if (sanity_check(info, tty->name, "close"))
722 return;
723 DBGINFO(("%s close entry, count=%d\n", info->device_name, info->port.count));
724
725 if (tty_port_close_start(&info->port, tty, filp) == 0)
726 goto cleanup;
727
728 mutex_lock(&info->port.mutex);
729 if (tty_port_initialized(&info->port))
730 wait_until_sent(tty, info->timeout);
731 flush_buffer(tty);
732 tty_ldisc_flush(tty);
733
734 shutdown(info);
735 mutex_unlock(&info->port.mutex);
736
737 tty_port_close_end(&info->port, tty);
738 info->port.tty = NULL;
739 cleanup:
740 DBGINFO(("%s close exit, count=%d\n", tty->driver->name, info->port.count));
741 }
742
743 static void hangup(struct tty_struct *tty)
744 {
745 struct slgt_info *info = tty->driver_data;
746 unsigned long flags;
747
748 if (sanity_check(info, tty->name, "hangup"))
749 return;
750 DBGINFO(("%s hangup\n", info->device_name));
751
752 flush_buffer(tty);
753
754 mutex_lock(&info->port.mutex);
755 shutdown(info);
756
757 spin_lock_irqsave(&info->port.lock, flags);
758 info->port.count = 0;
759 info->port.tty = NULL;
760 spin_unlock_irqrestore(&info->port.lock, flags);
761 tty_port_set_active(&info->port, 0);
762 mutex_unlock(&info->port.mutex);
763
764 wake_up_interruptible(&info->port.open_wait);
765 }
766
767 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)
768 {
769 struct slgt_info *info = tty->driver_data;
770 unsigned long flags;
771
772 DBGINFO(("%s set_termios\n", tty->driver->name));
773
774 change_params(info);
775
776 /* Handle transition to B0 status */
777 if ((old_termios->c_cflag & CBAUD) && !C_BAUD(tty)) {
778 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
779 spin_lock_irqsave(&info->lock,flags);
780 set_signals(info);
781 spin_unlock_irqrestore(&info->lock,flags);
782 }
783
784 /* Handle transition away from B0 status */
785 if (!(old_termios->c_cflag & CBAUD) && C_BAUD(tty)) {
786 info->signals |= SerialSignal_DTR;
787 if (!C_CRTSCTS(tty) || !tty_throttled(tty))
788 info->signals |= SerialSignal_RTS;
789 spin_lock_irqsave(&info->lock,flags);
790 set_signals(info);
791 spin_unlock_irqrestore(&info->lock,flags);
792 }
793
794 /* Handle turning off CRTSCTS */
795 if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) {
796 tty->hw_stopped = 0;
797 tx_release(tty);
798 }
799 }
800
801 static void update_tx_timer(struct slgt_info *info)
802 {
803 /*
804 * use worst case speed of 1200bps to calculate transmit timeout
805 * based on data in buffers (tbuf_bytes) and FIFO (128 bytes)
806 */
807 if (info->params.mode == MGSL_MODE_HDLC) {
808 int timeout = (tbuf_bytes(info) * 7) + 1000;
809 mod_timer(&info->tx_timer, jiffies + msecs_to_jiffies(timeout));
810 }
811 }
812
813 static int write(struct tty_struct *tty,
814 const unsigned char *buf, int count)
815 {
816 int ret = 0;
817 struct slgt_info *info = tty->driver_data;
818 unsigned long flags;
819
820 if (sanity_check(info, tty->name, "write"))
821 return -EIO;
822
823 DBGINFO(("%s write count=%d\n", info->device_name, count));
824
825 if (!info->tx_buf || (count > info->max_frame_size))
826 return -EIO;
827
828 if (!count || tty->stopped || tty->hw_stopped)
829 return 0;
830
831 spin_lock_irqsave(&info->lock, flags);
832
833 if (info->tx_count) {
834 /* send accumulated data from send_char() */
835 if (!tx_load(info, info->tx_buf, info->tx_count))
836 goto cleanup;
837 info->tx_count = 0;
838 }
839
840 if (tx_load(info, buf, count))
841 ret = count;
842
843 cleanup:
844 spin_unlock_irqrestore(&info->lock, flags);
845 DBGINFO(("%s write rc=%d\n", info->device_name, ret));
846 return ret;
847 }
848
849 static int put_char(struct tty_struct *tty, unsigned char ch)
850 {
851 struct slgt_info *info = tty->driver_data;
852 unsigned long flags;
853 int ret = 0;
854
855 if (sanity_check(info, tty->name, "put_char"))
856 return 0;
857 DBGINFO(("%s put_char(%d)\n", info->device_name, ch));
858 if (!info->tx_buf)
859 return 0;
860 spin_lock_irqsave(&info->lock,flags);
861 if (info->tx_count < info->max_frame_size) {
862 info->tx_buf[info->tx_count++] = ch;
863 ret = 1;
864 }
865 spin_unlock_irqrestore(&info->lock,flags);
866 return ret;
867 }
868
869 static void send_xchar(struct tty_struct *tty, char ch)
870 {
871 struct slgt_info *info = tty->driver_data;
872 unsigned long flags;
873
874 if (sanity_check(info, tty->name, "send_xchar"))
875 return;
876 DBGINFO(("%s send_xchar(%d)\n", info->device_name, ch));
877 info->x_char = ch;
878 if (ch) {
879 spin_lock_irqsave(&info->lock,flags);
880 if (!info->tx_enabled)
881 tx_start(info);
882 spin_unlock_irqrestore(&info->lock,flags);
883 }
884 }
885
886 static void wait_until_sent(struct tty_struct *tty, int timeout)
887 {
888 struct slgt_info *info = tty->driver_data;
889 unsigned long orig_jiffies, char_time;
890
891 if (!info )
892 return;
893 if (sanity_check(info, tty->name, "wait_until_sent"))
894 return;
895 DBGINFO(("%s wait_until_sent entry\n", info->device_name));
896 if (!tty_port_initialized(&info->port))
897 goto exit;
898
899 orig_jiffies = jiffies;
900
901 /* Set check interval to 1/5 of estimated time to
902 * send a character, and make it at least 1. The check
903 * interval should also be less than the timeout.
904 * Note: use tight timings here to satisfy the NIST-PCTS.
905 */
906
907 if (info->params.data_rate) {
908 char_time = info->timeout/(32 * 5);
909 if (!char_time)
910 char_time++;
911 } else
912 char_time = 1;
913
914 if (timeout)
915 char_time = min_t(unsigned long, char_time, timeout);
916
917 while (info->tx_active) {
918 msleep_interruptible(jiffies_to_msecs(char_time));
919 if (signal_pending(current))
920 break;
921 if (timeout && time_after(jiffies, orig_jiffies + timeout))
922 break;
923 }
924 exit:
925 DBGINFO(("%s wait_until_sent exit\n", info->device_name));
926 }
927
928 static int write_room(struct tty_struct *tty)
929 {
930 struct slgt_info *info = tty->driver_data;
931 int ret;
932
933 if (sanity_check(info, tty->name, "write_room"))
934 return 0;
935 ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
936 DBGINFO(("%s write_room=%d\n", info->device_name, ret));
937 return ret;
938 }
939
940 static void flush_chars(struct tty_struct *tty)
941 {
942 struct slgt_info *info = tty->driver_data;
943 unsigned long flags;
944
945 if (sanity_check(info, tty->name, "flush_chars"))
946 return;
947 DBGINFO(("%s flush_chars entry tx_count=%d\n", info->device_name, info->tx_count));
948
949 if (info->tx_count <= 0 || tty->stopped ||
950 tty->hw_stopped || !info->tx_buf)
951 return;
952
953 DBGINFO(("%s flush_chars start transmit\n", info->device_name));
954
955 spin_lock_irqsave(&info->lock,flags);
956 if (info->tx_count && tx_load(info, info->tx_buf, info->tx_count))
957 info->tx_count = 0;
958 spin_unlock_irqrestore(&info->lock,flags);
959 }
960
961 static void flush_buffer(struct tty_struct *tty)
962 {
963 struct slgt_info *info = tty->driver_data;
964 unsigned long flags;
965
966 if (sanity_check(info, tty->name, "flush_buffer"))
967 return;
968 DBGINFO(("%s flush_buffer\n", info->device_name));
969
970 spin_lock_irqsave(&info->lock, flags);
971 info->tx_count = 0;
972 spin_unlock_irqrestore(&info->lock, flags);
973
974 tty_wakeup(tty);
975 }
976
977 /*
978 * throttle (stop) transmitter
979 */
980 static void tx_hold(struct tty_struct *tty)
981 {
982 struct slgt_info *info = tty->driver_data;
983 unsigned long flags;
984
985 if (sanity_check(info, tty->name, "tx_hold"))
986 return;
987 DBGINFO(("%s tx_hold\n", info->device_name));
988 spin_lock_irqsave(&info->lock,flags);
989 if (info->tx_enabled && info->params.mode == MGSL_MODE_ASYNC)
990 tx_stop(info);
991 spin_unlock_irqrestore(&info->lock,flags);
992 }
993
994 /*
995 * release (start) transmitter
996 */
997 static void tx_release(struct tty_struct *tty)
998 {
999 struct slgt_info *info = tty->driver_data;
1000 unsigned long flags;
1001
1002 if (sanity_check(info, tty->name, "tx_release"))
1003 return;
1004 DBGINFO(("%s tx_release\n", info->device_name));
1005 spin_lock_irqsave(&info->lock, flags);
1006 if (info->tx_count && tx_load(info, info->tx_buf, info->tx_count))
1007 info->tx_count = 0;
1008 spin_unlock_irqrestore(&info->lock, flags);
1009 }
1010
1011 /*
1012 * Service an IOCTL request
1013 *
1014 * Arguments
1015 *
1016 * tty pointer to tty instance data
1017 * cmd IOCTL command code
1018 * arg command argument/context
1019 *
1020 * Return 0 if success, otherwise error code
1021 */
1022 static int ioctl(struct tty_struct *tty,
1023 unsigned int cmd, unsigned long arg)
1024 {
1025 struct slgt_info *info = tty->driver_data;
1026 void __user *argp = (void __user *)arg;
1027 int ret;
1028
1029 if (sanity_check(info, tty->name, "ioctl"))
1030 return -ENODEV;
1031 DBGINFO(("%s ioctl() cmd=%08X\n", info->device_name, cmd));
1032
1033 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1034 (cmd != TIOCMIWAIT)) {
1035 if (tty_io_error(tty))
1036 return -EIO;
1037 }
1038
1039 switch (cmd) {
1040 case MGSL_IOCWAITEVENT:
1041 return wait_mgsl_event(info, argp);
1042 case TIOCMIWAIT:
1043 return modem_input_wait(info,(int)arg);
1044 case MGSL_IOCSGPIO:
1045 return set_gpio(info, argp);
1046 case MGSL_IOCGGPIO:
1047 return get_gpio(info, argp);
1048 case MGSL_IOCWAITGPIO:
1049 return wait_gpio(info, argp);
1050 case MGSL_IOCGXSYNC:
1051 return get_xsync(info, argp);
1052 case MGSL_IOCSXSYNC:
1053 return set_xsync(info, (int)arg);
1054 case MGSL_IOCGXCTRL:
1055 return get_xctrl(info, argp);
1056 case MGSL_IOCSXCTRL:
1057 return set_xctrl(info, (int)arg);
1058 }
1059 mutex_lock(&info->port.mutex);
1060 switch (cmd) {
1061 case MGSL_IOCGPARAMS:
1062 ret = get_params(info, argp);
1063 break;
1064 case MGSL_IOCSPARAMS:
1065 ret = set_params(info, argp);
1066 break;
1067 case MGSL_IOCGTXIDLE:
1068 ret = get_txidle(info, argp);
1069 break;
1070 case MGSL_IOCSTXIDLE:
1071 ret = set_txidle(info, (int)arg);
1072 break;
1073 case MGSL_IOCTXENABLE:
1074 ret = tx_enable(info, (int)arg);
1075 break;
1076 case MGSL_IOCRXENABLE:
1077 ret = rx_enable(info, (int)arg);
1078 break;
1079 case MGSL_IOCTXABORT:
1080 ret = tx_abort(info);
1081 break;
1082 case MGSL_IOCGSTATS:
1083 ret = get_stats(info, argp);
1084 break;
1085 case MGSL_IOCGIF:
1086 ret = get_interface(info, argp);
1087 break;
1088 case MGSL_IOCSIF:
1089 ret = set_interface(info,(int)arg);
1090 break;
1091 default:
1092 ret = -ENOIOCTLCMD;
1093 }
1094 mutex_unlock(&info->port.mutex);
1095 return ret;
1096 }
1097
1098 static int get_icount(struct tty_struct *tty,
1099 struct serial_icounter_struct *icount)
1100
1101 {
1102 struct slgt_info *info = tty->driver_data;
1103 struct mgsl_icount cnow; /* kernel counter temps */
1104 unsigned long flags;
1105
1106 spin_lock_irqsave(&info->lock,flags);
1107 cnow = info->icount;
1108 spin_unlock_irqrestore(&info->lock,flags);
1109
1110 icount->cts = cnow.cts;
1111 icount->dsr = cnow.dsr;
1112 icount->rng = cnow.rng;
1113 icount->dcd = cnow.dcd;
1114 icount->rx = cnow.rx;
1115 icount->tx = cnow.tx;
1116 icount->frame = cnow.frame;
1117 icount->overrun = cnow.overrun;
1118 icount->parity = cnow.parity;
1119 icount->brk = cnow.brk;
1120 icount->buf_overrun = cnow.buf_overrun;
1121
1122 return 0;
1123 }
1124
1125 /*
1126 * support for 32 bit ioctl calls on 64 bit systems
1127 */
1128 #ifdef CONFIG_COMPAT
1129 static long get_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *user_params)
1130 {
1131 struct MGSL_PARAMS32 tmp_params;
1132
1133 DBGINFO(("%s get_params32\n", info->device_name));
1134 memset(&tmp_params, 0, sizeof(tmp_params));
1135 tmp_params.mode = (compat_ulong_t)info->params.mode;
1136 tmp_params.loopback = info->params.loopback;
1137 tmp_params.flags = info->params.flags;
1138 tmp_params.encoding = info->params.encoding;
1139 tmp_params.clock_speed = (compat_ulong_t)info->params.clock_speed;
1140 tmp_params.addr_filter = info->params.addr_filter;
1141 tmp_params.crc_type = info->params.crc_type;
1142 tmp_params.preamble_length = info->params.preamble_length;
1143 tmp_params.preamble = info->params.preamble;
1144 tmp_params.data_rate = (compat_ulong_t)info->params.data_rate;
1145 tmp_params.data_bits = info->params.data_bits;
1146 tmp_params.stop_bits = info->params.stop_bits;
1147 tmp_params.parity = info->params.parity;
1148 if (copy_to_user(user_params, &tmp_params, sizeof(struct MGSL_PARAMS32)))
1149 return -EFAULT;
1150 return 0;
1151 }
1152
1153 static long set_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *new_params)
1154 {
1155 struct MGSL_PARAMS32 tmp_params;
1156
1157 DBGINFO(("%s set_params32\n", info->device_name));
1158 if (copy_from_user(&tmp_params, new_params, sizeof(struct MGSL_PARAMS32)))
1159 return -EFAULT;
1160
1161 spin_lock(&info->lock);
1162 if (tmp_params.mode == MGSL_MODE_BASE_CLOCK) {
1163 info->base_clock = tmp_params.clock_speed;
1164 } else {
1165 info->params.mode = tmp_params.mode;
1166 info->params.loopback = tmp_params.loopback;
1167 info->params.flags = tmp_params.flags;
1168 info->params.encoding = tmp_params.encoding;
1169 info->params.clock_speed = tmp_params.clock_speed;
1170 info->params.addr_filter = tmp_params.addr_filter;
1171 info->params.crc_type = tmp_params.crc_type;
1172 info->params.preamble_length = tmp_params.preamble_length;
1173 info->params.preamble = tmp_params.preamble;
1174 info->params.data_rate = tmp_params.data_rate;
1175 info->params.data_bits = tmp_params.data_bits;
1176 info->params.stop_bits = tmp_params.stop_bits;
1177 info->params.parity = tmp_params.parity;
1178 }
1179 spin_unlock(&info->lock);
1180
1181 program_hw(info);
1182
1183 return 0;
1184 }
1185
1186 static long slgt_compat_ioctl(struct tty_struct *tty,
1187 unsigned int cmd, unsigned long arg)
1188 {
1189 struct slgt_info *info = tty->driver_data;
1190 int rc = -ENOIOCTLCMD;
1191
1192 if (sanity_check(info, tty->name, "compat_ioctl"))
1193 return -ENODEV;
1194 DBGINFO(("%s compat_ioctl() cmd=%08X\n", info->device_name, cmd));
1195
1196 switch (cmd) {
1197
1198 case MGSL_IOCSPARAMS32:
1199 rc = set_params32(info, compat_ptr(arg));
1200 break;
1201
1202 case MGSL_IOCGPARAMS32:
1203 rc = get_params32(info, compat_ptr(arg));
1204 break;
1205
1206 case MGSL_IOCGPARAMS:
1207 case MGSL_IOCSPARAMS:
1208 case MGSL_IOCGTXIDLE:
1209 case MGSL_IOCGSTATS:
1210 case MGSL_IOCWAITEVENT:
1211 case MGSL_IOCGIF:
1212 case MGSL_IOCSGPIO:
1213 case MGSL_IOCGGPIO:
1214 case MGSL_IOCWAITGPIO:
1215 case MGSL_IOCGXSYNC:
1216 case MGSL_IOCGXCTRL:
1217 case MGSL_IOCSTXIDLE:
1218 case MGSL_IOCTXENABLE:
1219 case MGSL_IOCRXENABLE:
1220 case MGSL_IOCTXABORT:
1221 case TIOCMIWAIT:
1222 case MGSL_IOCSIF:
1223 case MGSL_IOCSXSYNC:
1224 case MGSL_IOCSXCTRL:
1225 rc = ioctl(tty, cmd, arg);
1226 break;
1227 }
1228
1229 DBGINFO(("%s compat_ioctl() cmd=%08X rc=%d\n", info->device_name, cmd, rc));
1230 return rc;
1231 }
1232 #else
1233 #define slgt_compat_ioctl NULL
1234 #endif /* ifdef CONFIG_COMPAT */
1235
1236 /*
1237 * proc fs support
1238 */
1239 static inline void line_info(struct seq_file *m, struct slgt_info *info)
1240 {
1241 char stat_buf[30];
1242 unsigned long flags;
1243
1244 seq_printf(m, "%s: IO=%08X IRQ=%d MaxFrameSize=%u\n",
1245 info->device_name, info->phys_reg_addr,
1246 info->irq_level, info->max_frame_size);
1247
1248 /* output current serial signal states */
1249 spin_lock_irqsave(&info->lock,flags);
1250 get_signals(info);
1251 spin_unlock_irqrestore(&info->lock,flags);
1252
1253 stat_buf[0] = 0;
1254 stat_buf[1] = 0;
1255 if (info->signals & SerialSignal_RTS)
1256 strcat(stat_buf, "|RTS");
1257 if (info->signals & SerialSignal_CTS)
1258 strcat(stat_buf, "|CTS");
1259 if (info->signals & SerialSignal_DTR)
1260 strcat(stat_buf, "|DTR");
1261 if (info->signals & SerialSignal_DSR)
1262 strcat(stat_buf, "|DSR");
1263 if (info->signals & SerialSignal_DCD)
1264 strcat(stat_buf, "|CD");
1265 if (info->signals & SerialSignal_RI)
1266 strcat(stat_buf, "|RI");
1267
1268 if (info->params.mode != MGSL_MODE_ASYNC) {
1269 seq_printf(m, "\tHDLC txok:%d rxok:%d",
1270 info->icount.txok, info->icount.rxok);
1271 if (info->icount.txunder)
1272 seq_printf(m, " txunder:%d", info->icount.txunder);
1273 if (info->icount.txabort)
1274 seq_printf(m, " txabort:%d", info->icount.txabort);
1275 if (info->icount.rxshort)
1276 seq_printf(m, " rxshort:%d", info->icount.rxshort);
1277 if (info->icount.rxlong)
1278 seq_printf(m, " rxlong:%d", info->icount.rxlong);
1279 if (info->icount.rxover)
1280 seq_printf(m, " rxover:%d", info->icount.rxover);
1281 if (info->icount.rxcrc)
1282 seq_printf(m, " rxcrc:%d", info->icount.rxcrc);
1283 } else {
1284 seq_printf(m, "\tASYNC tx:%d rx:%d",
1285 info->icount.tx, info->icount.rx);
1286 if (info->icount.frame)
1287 seq_printf(m, " fe:%d", info->icount.frame);
1288 if (info->icount.parity)
1289 seq_printf(m, " pe:%d", info->icount.parity);
1290 if (info->icount.brk)
1291 seq_printf(m, " brk:%d", info->icount.brk);
1292 if (info->icount.overrun)
1293 seq_printf(m, " oe:%d", info->icount.overrun);
1294 }
1295
1296 /* Append serial signal status to end */
1297 seq_printf(m, " %s\n", stat_buf+1);
1298
1299 seq_printf(m, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
1300 info->tx_active,info->bh_requested,info->bh_running,
1301 info->pending_bh);
1302 }
1303
1304 /* Called to print information about devices
1305 */
1306 static int synclink_gt_proc_show(struct seq_file *m, void *v)
1307 {
1308 struct slgt_info *info;
1309
1310 seq_puts(m, "synclink_gt driver\n");
1311
1312 info = slgt_device_list;
1313 while( info ) {
1314 line_info(m, info);
1315 info = info->next_device;
1316 }
1317 return 0;
1318 }
1319
1320 static int synclink_gt_proc_open(struct inode *inode, struct file *file)
1321 {
1322 return single_open(file, synclink_gt_proc_show, NULL);
1323 }
1324
1325 static const struct file_operations synclink_gt_proc_fops = {
1326 .owner = THIS_MODULE,
1327 .open = synclink_gt_proc_open,
1328 .read = seq_read,
1329 .llseek = seq_lseek,
1330 .release = single_release,
1331 };
1332
1333 /*
1334 * return count of bytes in transmit buffer
1335 */
1336 static int chars_in_buffer(struct tty_struct *tty)
1337 {
1338 struct slgt_info *info = tty->driver_data;
1339 int count;
1340 if (sanity_check(info, tty->name, "chars_in_buffer"))
1341 return 0;
1342 count = tbuf_bytes(info);
1343 DBGINFO(("%s chars_in_buffer()=%d\n", info->device_name, count));
1344 return count;
1345 }
1346
1347 /*
1348 * signal remote device to throttle send data (our receive data)
1349 */
1350 static void throttle(struct tty_struct * tty)
1351 {
1352 struct slgt_info *info = tty->driver_data;
1353 unsigned long flags;
1354
1355 if (sanity_check(info, tty->name, "throttle"))
1356 return;
1357 DBGINFO(("%s throttle\n", info->device_name));
1358 if (I_IXOFF(tty))
1359 send_xchar(tty, STOP_CHAR(tty));
1360 if (C_CRTSCTS(tty)) {
1361 spin_lock_irqsave(&info->lock,flags);
1362 info->signals &= ~SerialSignal_RTS;
1363 set_signals(info);
1364 spin_unlock_irqrestore(&info->lock,flags);
1365 }
1366 }
1367
1368 /*
1369 * signal remote device to stop throttling send data (our receive data)
1370 */
1371 static void unthrottle(struct tty_struct * tty)
1372 {
1373 struct slgt_info *info = tty->driver_data;
1374 unsigned long flags;
1375
1376 if (sanity_check(info, tty->name, "unthrottle"))
1377 return;
1378 DBGINFO(("%s unthrottle\n", info->device_name));
1379 if (I_IXOFF(tty)) {
1380 if (info->x_char)
1381 info->x_char = 0;
1382 else
1383 send_xchar(tty, START_CHAR(tty));
1384 }
1385 if (C_CRTSCTS(tty)) {
1386 spin_lock_irqsave(&info->lock,flags);
1387 info->signals |= SerialSignal_RTS;
1388 set_signals(info);
1389 spin_unlock_irqrestore(&info->lock,flags);
1390 }
1391 }
1392
1393 /*
1394 * set or clear transmit break condition
1395 * break_state -1=set break condition, 0=clear
1396 */
1397 static int set_break(struct tty_struct *tty, int break_state)
1398 {
1399 struct slgt_info *info = tty->driver_data;
1400 unsigned short value;
1401 unsigned long flags;
1402
1403 if (sanity_check(info, tty->name, "set_break"))
1404 return -EINVAL;
1405 DBGINFO(("%s set_break(%d)\n", info->device_name, break_state));
1406
1407 spin_lock_irqsave(&info->lock,flags);
1408 value = rd_reg16(info, TCR);
1409 if (break_state == -1)
1410 value |= BIT6;
1411 else
1412 value &= ~BIT6;
1413 wr_reg16(info, TCR, value);
1414 spin_unlock_irqrestore(&info->lock,flags);
1415 return 0;
1416 }
1417
1418 #if SYNCLINK_GENERIC_HDLC
1419
1420 /**
1421 * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
1422 * set encoding and frame check sequence (FCS) options
1423 *
1424 * dev pointer to network device structure
1425 * encoding serial encoding setting
1426 * parity FCS setting
1427 *
1428 * returns 0 if success, otherwise error code
1429 */
1430 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
1431 unsigned short parity)
1432 {
1433 struct slgt_info *info = dev_to_port(dev);
1434 unsigned char new_encoding;
1435 unsigned short new_crctype;
1436
1437 /* return error if TTY interface open */
1438 if (info->port.count)
1439 return -EBUSY;
1440
1441 DBGINFO(("%s hdlcdev_attach\n", info->device_name));
1442
1443 switch (encoding)
1444 {
1445 case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break;
1446 case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
1447 case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
1448 case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
1449 case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
1450 default: return -EINVAL;
1451 }
1452
1453 switch (parity)
1454 {
1455 case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break;
1456 case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
1457 case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
1458 default: return -EINVAL;
1459 }
1460
1461 info->params.encoding = new_encoding;
1462 info->params.crc_type = new_crctype;
1463
1464 /* if network interface up, reprogram hardware */
1465 if (info->netcount)
1466 program_hw(info);
1467
1468 return 0;
1469 }
1470
1471 /**
1472 * called by generic HDLC layer to send frame
1473 *
1474 * skb socket buffer containing HDLC frame
1475 * dev pointer to network device structure
1476 */
1477 static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb,
1478 struct net_device *dev)
1479 {
1480 struct slgt_info *info = dev_to_port(dev);
1481 unsigned long flags;
1482
1483 DBGINFO(("%s hdlc_xmit\n", dev->name));
1484
1485 if (!skb->len)
1486 return NETDEV_TX_OK;
1487
1488 /* stop sending until this frame completes */
1489 netif_stop_queue(dev);
1490
1491 /* update network statistics */
1492 dev->stats.tx_packets++;
1493 dev->stats.tx_bytes += skb->len;
1494
1495 /* save start time for transmit timeout detection */
1496 netif_trans_update(dev);
1497
1498 spin_lock_irqsave(&info->lock, flags);
1499 tx_load(info, skb->data, skb->len);
1500 spin_unlock_irqrestore(&info->lock, flags);
1501
1502 /* done with socket buffer, so free it */
1503 dev_kfree_skb(skb);
1504
1505 return NETDEV_TX_OK;
1506 }
1507
1508 /**
1509 * called by network layer when interface enabled
1510 * claim resources and initialize hardware
1511 *
1512 * dev pointer to network device structure
1513 *
1514 * returns 0 if success, otherwise error code
1515 */
1516 static int hdlcdev_open(struct net_device *dev)
1517 {
1518 struct slgt_info *info = dev_to_port(dev);
1519 int rc;
1520 unsigned long flags;
1521
1522 if (!try_module_get(THIS_MODULE))
1523 return -EBUSY;
1524
1525 DBGINFO(("%s hdlcdev_open\n", dev->name));
1526
1527 /* generic HDLC layer open processing */
1528 rc = hdlc_open(dev);
1529 if (rc)
1530 return rc;
1531
1532 /* arbitrate between network and tty opens */
1533 spin_lock_irqsave(&info->netlock, flags);
1534 if (info->port.count != 0 || info->netcount != 0) {
1535 DBGINFO(("%s hdlc_open busy\n", dev->name));
1536 spin_unlock_irqrestore(&info->netlock, flags);
1537 return -EBUSY;
1538 }
1539 info->netcount=1;
1540 spin_unlock_irqrestore(&info->netlock, flags);
1541
1542 /* claim resources and init adapter */
1543 if ((rc = startup(info)) != 0) {
1544 spin_lock_irqsave(&info->netlock, flags);
1545 info->netcount=0;
1546 spin_unlock_irqrestore(&info->netlock, flags);
1547 return rc;
1548 }
1549
1550 /* assert RTS and DTR, apply hardware settings */
1551 info->signals |= SerialSignal_RTS | SerialSignal_DTR;
1552 program_hw(info);
1553
1554 /* enable network layer transmit */
1555 netif_trans_update(dev);
1556 netif_start_queue(dev);
1557
1558 /* inform generic HDLC layer of current DCD status */
1559 spin_lock_irqsave(&info->lock, flags);
1560 get_signals(info);
1561 spin_unlock_irqrestore(&info->lock, flags);
1562 if (info->signals & SerialSignal_DCD)
1563 netif_carrier_on(dev);
1564 else
1565 netif_carrier_off(dev);
1566 return 0;
1567 }
1568
1569 /**
1570 * called by network layer when interface is disabled
1571 * shutdown hardware and release resources
1572 *
1573 * dev pointer to network device structure
1574 *
1575 * returns 0 if success, otherwise error code
1576 */
1577 static int hdlcdev_close(struct net_device *dev)
1578 {
1579 struct slgt_info *info = dev_to_port(dev);
1580 unsigned long flags;
1581
1582 DBGINFO(("%s hdlcdev_close\n", dev->name));
1583
1584 netif_stop_queue(dev);
1585
1586 /* shutdown adapter and release resources */
1587 shutdown(info);
1588
1589 hdlc_close(dev);
1590
1591 spin_lock_irqsave(&info->netlock, flags);
1592 info->netcount=0;
1593 spin_unlock_irqrestore(&info->netlock, flags);
1594
1595 module_put(THIS_MODULE);
1596 return 0;
1597 }
1598
1599 /**
1600 * called by network layer to process IOCTL call to network device
1601 *
1602 * dev pointer to network device structure
1603 * ifr pointer to network interface request structure
1604 * cmd IOCTL command code
1605 *
1606 * returns 0 if success, otherwise error code
1607 */
1608 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1609 {
1610 const size_t size = sizeof(sync_serial_settings);
1611 sync_serial_settings new_line;
1612 sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
1613 struct slgt_info *info = dev_to_port(dev);
1614 unsigned int flags;
1615
1616 DBGINFO(("%s hdlcdev_ioctl\n", dev->name));
1617
1618 /* return error if TTY interface open */
1619 if (info->port.count)
1620 return -EBUSY;
1621
1622 if (cmd != SIOCWANDEV)
1623 return hdlc_ioctl(dev, ifr, cmd);
1624
1625 memset(&new_line, 0, sizeof(new_line));
1626
1627 switch(ifr->ifr_settings.type) {
1628 case IF_GET_IFACE: /* return current sync_serial_settings */
1629
1630 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
1631 if (ifr->ifr_settings.size < size) {
1632 ifr->ifr_settings.size = size; /* data size wanted */
1633 return -ENOBUFS;
1634 }
1635
1636 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1637 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1638 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1639 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
1640
1641 switch (flags){
1642 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
1643 case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break;
1644 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break;
1645 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
1646 default: new_line.clock_type = CLOCK_DEFAULT;
1647 }
1648
1649 new_line.clock_rate = info->params.clock_speed;
1650 new_line.loopback = info->params.loopback ? 1:0;
1651
1652 if (copy_to_user(line, &new_line, size))
1653 return -EFAULT;
1654 return 0;
1655
1656 case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
1657
1658 if(!capable(CAP_NET_ADMIN))
1659 return -EPERM;
1660 if (copy_from_user(&new_line, line, size))
1661 return -EFAULT;
1662
1663 switch (new_line.clock_type)
1664 {
1665 case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
1666 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
1667 case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break;
1668 case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break;
1669 case CLOCK_DEFAULT: flags = info->params.flags &
1670 (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1671 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1672 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1673 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); break;
1674 default: return -EINVAL;
1675 }
1676
1677 if (new_line.loopback != 0 && new_line.loopback != 1)
1678 return -EINVAL;
1679
1680 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1681 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1682 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1683 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
1684 info->params.flags |= flags;
1685
1686 info->params.loopback = new_line.loopback;
1687
1688 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
1689 info->params.clock_speed = new_line.clock_rate;
1690 else
1691 info->params.clock_speed = 0;
1692
1693 /* if network interface up, reprogram hardware */
1694 if (info->netcount)
1695 program_hw(info);
1696 return 0;
1697
1698 default:
1699 return hdlc_ioctl(dev, ifr, cmd);
1700 }
1701 }
1702
1703 /**
1704 * called by network layer when transmit timeout is detected
1705 *
1706 * dev pointer to network device structure
1707 */
1708 static void hdlcdev_tx_timeout(struct net_device *dev)
1709 {
1710 struct slgt_info *info = dev_to_port(dev);
1711 unsigned long flags;
1712
1713 DBGINFO(("%s hdlcdev_tx_timeout\n", dev->name));
1714
1715 dev->stats.tx_errors++;
1716 dev->stats.tx_aborted_errors++;
1717
1718 spin_lock_irqsave(&info->lock,flags);
1719 tx_stop(info);
1720 spin_unlock_irqrestore(&info->lock,flags);
1721
1722 netif_wake_queue(dev);
1723 }
1724
1725 /**
1726 * called by device driver when transmit completes
1727 * reenable network layer transmit if stopped
1728 *
1729 * info pointer to device instance information
1730 */
1731 static void hdlcdev_tx_done(struct slgt_info *info)
1732 {
1733 if (netif_queue_stopped(info->netdev))
1734 netif_wake_queue(info->netdev);
1735 }
1736
1737 /**
1738 * called by device driver when frame received
1739 * pass frame to network layer
1740 *
1741 * info pointer to device instance information
1742 * buf pointer to buffer contianing frame data
1743 * size count of data bytes in buf
1744 */
1745 static void hdlcdev_rx(struct slgt_info *info, char *buf, int size)
1746 {
1747 struct sk_buff *skb = dev_alloc_skb(size);
1748 struct net_device *dev = info->netdev;
1749
1750 DBGINFO(("%s hdlcdev_rx\n", dev->name));
1751
1752 if (skb == NULL) {
1753 DBGERR(("%s: can't alloc skb, drop packet\n", dev->name));
1754 dev->stats.rx_dropped++;
1755 return;
1756 }
1757
1758 memcpy(skb_put(skb, size), buf, size);
1759
1760 skb->protocol = hdlc_type_trans(skb, dev);
1761
1762 dev->stats.rx_packets++;
1763 dev->stats.rx_bytes += size;
1764
1765 netif_rx(skb);
1766 }
1767
1768 static const struct net_device_ops hdlcdev_ops = {
1769 .ndo_open = hdlcdev_open,
1770 .ndo_stop = hdlcdev_close,
1771 .ndo_change_mtu = hdlc_change_mtu,
1772 .ndo_start_xmit = hdlc_start_xmit,
1773 .ndo_do_ioctl = hdlcdev_ioctl,
1774 .ndo_tx_timeout = hdlcdev_tx_timeout,
1775 };
1776
1777 /**
1778 * called by device driver when adding device instance
1779 * do generic HDLC initialization
1780 *
1781 * info pointer to device instance information
1782 *
1783 * returns 0 if success, otherwise error code
1784 */
1785 static int hdlcdev_init(struct slgt_info *info)
1786 {
1787 int rc;
1788 struct net_device *dev;
1789 hdlc_device *hdlc;
1790
1791 /* allocate and initialize network and HDLC layer objects */
1792
1793 dev = alloc_hdlcdev(info);
1794 if (!dev) {
1795 printk(KERN_ERR "%s hdlc device alloc failure\n", info->device_name);
1796 return -ENOMEM;
1797 }
1798
1799 /* for network layer reporting purposes only */
1800 dev->mem_start = info->phys_reg_addr;
1801 dev->mem_end = info->phys_reg_addr + SLGT_REG_SIZE - 1;
1802 dev->irq = info->irq_level;
1803
1804 /* network layer callbacks and settings */
1805 dev->netdev_ops = &hdlcdev_ops;
1806 dev->watchdog_timeo = 10 * HZ;
1807 dev->tx_queue_len = 50;
1808
1809 /* generic HDLC layer callbacks and settings */
1810 hdlc = dev_to_hdlc(dev);
1811 hdlc->attach = hdlcdev_attach;
1812 hdlc->xmit = hdlcdev_xmit;
1813
1814 /* register objects with HDLC layer */
1815 rc = register_hdlc_device(dev);
1816 if (rc) {
1817 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
1818 free_netdev(dev);
1819 return rc;
1820 }
1821
1822 info->netdev = dev;
1823 return 0;
1824 }
1825
1826 /**
1827 * called by device driver when removing device instance
1828 * do generic HDLC cleanup
1829 *
1830 * info pointer to device instance information
1831 */
1832 static void hdlcdev_exit(struct slgt_info *info)
1833 {
1834 unregister_hdlc_device(info->netdev);
1835 free_netdev(info->netdev);
1836 info->netdev = NULL;
1837 }
1838
1839 #endif /* ifdef CONFIG_HDLC */
1840
1841 /*
1842 * get async data from rx DMA buffers
1843 */
1844 static void rx_async(struct slgt_info *info)
1845 {
1846 struct mgsl_icount *icount = &info->icount;
1847 unsigned int start, end;
1848 unsigned char *p;
1849 unsigned char status;
1850 struct slgt_desc *bufs = info->rbufs;
1851 int i, count;
1852 int chars = 0;
1853 int stat;
1854 unsigned char ch;
1855
1856 start = end = info->rbuf_current;
1857
1858 while(desc_complete(bufs[end])) {
1859 count = desc_count(bufs[end]) - info->rbuf_index;
1860 p = bufs[end].buf + info->rbuf_index;
1861
1862 DBGISR(("%s rx_async count=%d\n", info->device_name, count));
1863 DBGDATA(info, p, count, "rx");
1864
1865 for(i=0 ; i < count; i+=2, p+=2) {
1866 ch = *p;
1867 icount->rx++;
1868
1869 stat = 0;
1870
1871 status = *(p + 1) & (BIT1 + BIT0);
1872 if (status) {
1873 if (status & BIT1)
1874 icount->parity++;
1875 else if (status & BIT0)
1876 icount->frame++;
1877 /* discard char if tty control flags say so */
1878 if (status & info->ignore_status_mask)
1879 continue;
1880 if (status & BIT1)
1881 stat = TTY_PARITY;
1882 else if (status & BIT0)
1883 stat = TTY_FRAME;
1884 }
1885 tty_insert_flip_char(&info->port, ch, stat);
1886 chars++;
1887 }
1888
1889 if (i < count) {
1890 /* receive buffer not completed */
1891 info->rbuf_index += i;
1892 mod_timer(&info->rx_timer, jiffies + 1);
1893 break;
1894 }
1895
1896 info->rbuf_index = 0;
1897 free_rbufs(info, end, end);
1898
1899 if (++end == info->rbuf_count)
1900 end = 0;
1901
1902 /* if entire list searched then no frame available */
1903 if (end == start)
1904 break;
1905 }
1906
1907 if (chars)
1908 tty_flip_buffer_push(&info->port);
1909 }
1910
1911 /*
1912 * return next bottom half action to perform
1913 */
1914 static int bh_action(struct slgt_info *info)
1915 {
1916 unsigned long flags;
1917 int rc;
1918
1919 spin_lock_irqsave(&info->lock,flags);
1920
1921 if (info->pending_bh & BH_RECEIVE) {
1922 info->pending_bh &= ~BH_RECEIVE;
1923 rc = BH_RECEIVE;
1924 } else if (info->pending_bh & BH_TRANSMIT) {
1925 info->pending_bh &= ~BH_TRANSMIT;
1926 rc = BH_TRANSMIT;
1927 } else if (info->pending_bh & BH_STATUS) {
1928 info->pending_bh &= ~BH_STATUS;
1929 rc = BH_STATUS;
1930 } else {
1931 /* Mark BH routine as complete */
1932 info->bh_running = false;
1933 info->bh_requested = false;
1934 rc = 0;
1935 }
1936
1937 spin_unlock_irqrestore(&info->lock,flags);
1938
1939 return rc;
1940 }
1941
1942 /*
1943 * perform bottom half processing
1944 */
1945 static void bh_handler(struct work_struct *work)
1946 {
1947 struct slgt_info *info = container_of(work, struct slgt_info, task);
1948 int action;
1949
1950 info->bh_running = true;
1951
1952 while((action = bh_action(info))) {
1953 switch (action) {
1954 case BH_RECEIVE:
1955 DBGBH(("%s bh receive\n", info->device_name));
1956 switch(info->params.mode) {
1957 case MGSL_MODE_ASYNC:
1958 rx_async(info);
1959 break;
1960 case MGSL_MODE_HDLC:
1961 while(rx_get_frame(info));
1962 break;
1963 case MGSL_MODE_RAW:
1964 case MGSL_MODE_MONOSYNC:
1965 case MGSL_MODE_BISYNC:
1966 case MGSL_MODE_XSYNC:
1967 while(rx_get_buf(info));
1968 break;
1969 }
1970 /* restart receiver if rx DMA buffers exhausted */
1971 if (info->rx_restart)
1972 rx_start(info);
1973 break;
1974 case BH_TRANSMIT:
1975 bh_transmit(info);
1976 break;
1977 case BH_STATUS:
1978 DBGBH(("%s bh status\n", info->device_name));
1979 info->ri_chkcount = 0;
1980 info->dsr_chkcount = 0;
1981 info->dcd_chkcount = 0;
1982 info->cts_chkcount = 0;
1983 break;
1984 default:
1985 DBGBH(("%s unknown action\n", info->device_name));
1986 break;
1987 }
1988 }
1989 DBGBH(("%s bh_handler exit\n", info->device_name));
1990 }
1991
1992 static void bh_transmit(struct slgt_info *info)
1993 {
1994 struct tty_struct *tty = info->port.tty;
1995
1996 DBGBH(("%s bh_transmit\n", info->device_name));
1997 if (tty)
1998 tty_wakeup(tty);
1999 }
2000
2001 static void dsr_change(struct slgt_info *info, unsigned short status)
2002 {
2003 if (status & BIT3) {
2004 info->signals |= SerialSignal_DSR;
2005 info->input_signal_events.dsr_up++;
2006 } else {
2007 info->signals &= ~SerialSignal_DSR;
2008 info->input_signal_events.dsr_down++;
2009 }
2010 DBGISR(("dsr_change %s signals=%04X\n", info->device_name, info->signals));
2011 if ((info->dsr_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2012 slgt_irq_off(info, IRQ_DSR);
2013 return;
2014 }
2015 info->icount.dsr++;
2016 wake_up_interruptible(&info->status_event_wait_q);
2017 wake_up_interruptible(&info->event_wait_q);
2018 info->pending_bh |= BH_STATUS;
2019 }
2020
2021 static void cts_change(struct slgt_info *info, unsigned short status)
2022 {
2023 if (status & BIT2) {
2024 info->signals |= SerialSignal_CTS;
2025 info->input_signal_events.cts_up++;
2026 } else {
2027 info->signals &= ~SerialSignal_CTS;
2028 info->input_signal_events.cts_down++;
2029 }
2030 DBGISR(("cts_change %s signals=%04X\n", info->device_name, info->signals));
2031 if ((info->cts_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2032 slgt_irq_off(info, IRQ_CTS);
2033 return;
2034 }
2035 info->icount.cts++;
2036 wake_up_interruptible(&info->status_event_wait_q);
2037 wake_up_interruptible(&info->event_wait_q);
2038 info->pending_bh |= BH_STATUS;
2039
2040 if (tty_port_cts_enabled(&info->port)) {
2041 if (info->port.tty) {
2042 if (info->port.tty->hw_stopped) {
2043 if (info->signals & SerialSignal_CTS) {
2044 info->port.tty->hw_stopped = 0;
2045 info->pending_bh |= BH_TRANSMIT;
2046 return;
2047 }
2048 } else {
2049 if (!(info->signals & SerialSignal_CTS))
2050 info->port.tty->hw_stopped = 1;
2051 }
2052 }
2053 }
2054 }
2055
2056 static void dcd_change(struct slgt_info *info, unsigned short status)
2057 {
2058 if (status & BIT1) {
2059 info->signals |= SerialSignal_DCD;
2060 info->input_signal_events.dcd_up++;
2061 } else {
2062 info->signals &= ~SerialSignal_DCD;
2063 info->input_signal_events.dcd_down++;
2064 }
2065 DBGISR(("dcd_change %s signals=%04X\n", info->device_name, info->signals));
2066 if ((info->dcd_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2067 slgt_irq_off(info, IRQ_DCD);
2068 return;
2069 }
2070 info->icount.dcd++;
2071 #if SYNCLINK_GENERIC_HDLC
2072 if (info->netcount) {
2073 if (info->signals & SerialSignal_DCD)
2074 netif_carrier_on(info->netdev);
2075 else
2076 netif_carrier_off(info->netdev);
2077 }
2078 #endif
2079 wake_up_interruptible(&info->status_event_wait_q);
2080 wake_up_interruptible(&info->event_wait_q);
2081 info->pending_bh |= BH_STATUS;
2082
2083 if (tty_port_check_carrier(&info->port)) {
2084 if (info->signals & SerialSignal_DCD)
2085 wake_up_interruptible(&info->port.open_wait);
2086 else {
2087 if (info->port.tty)
2088 tty_hangup(info->port.tty);
2089 }
2090 }
2091 }
2092
2093 static void ri_change(struct slgt_info *info, unsigned short status)
2094 {
2095 if (status & BIT0) {
2096 info->signals |= SerialSignal_RI;
2097 info->input_signal_events.ri_up++;
2098 } else {
2099 info->signals &= ~SerialSignal_RI;
2100 info->input_signal_events.ri_down++;
2101 }
2102 DBGISR(("ri_change %s signals=%04X\n", info->device_name, info->signals));
2103 if ((info->ri_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2104 slgt_irq_off(info, IRQ_RI);
2105 return;
2106 }
2107 info->icount.rng++;
2108 wake_up_interruptible(&info->status_event_wait_q);
2109 wake_up_interruptible(&info->event_wait_q);
2110 info->pending_bh |= BH_STATUS;
2111 }
2112
2113 static void isr_rxdata(struct slgt_info *info)
2114 {
2115 unsigned int count = info->rbuf_fill_count;
2116 unsigned int i = info->rbuf_fill_index;
2117 unsigned short reg;
2118
2119 while (rd_reg16(info, SSR) & IRQ_RXDATA) {
2120 reg = rd_reg16(info, RDR);
2121 DBGISR(("isr_rxdata %s RDR=%04X\n", info->device_name, reg));
2122 if (desc_complete(info->rbufs[i])) {
2123 /* all buffers full */
2124 rx_stop(info);
2125 info->rx_restart = 1;
2126 continue;
2127 }
2128 info->rbufs[i].buf[count++] = (unsigned char)reg;
2129 /* async mode saves status byte to buffer for each data byte */
2130 if (info->params.mode == MGSL_MODE_ASYNC)
2131 info->rbufs[i].buf[count++] = (unsigned char)(reg >> 8);
2132 if (count == info->rbuf_fill_level || (reg & BIT10)) {
2133 /* buffer full or end of frame */
2134 set_desc_count(info->rbufs[i], count);
2135 set_desc_status(info->rbufs[i], BIT15 | (reg >> 8));
2136 info->rbuf_fill_count = count = 0;
2137 if (++i == info->rbuf_count)
2138 i = 0;
2139 info->pending_bh |= BH_RECEIVE;
2140 }
2141 }
2142
2143 info->rbuf_fill_index = i;
2144 info->rbuf_fill_count = count;
2145 }
2146
2147 static void isr_serial(struct slgt_info *info)
2148 {
2149 unsigned short status = rd_reg16(info, SSR);
2150
2151 DBGISR(("%s isr_serial status=%04X\n", info->device_name, status));
2152
2153 wr_reg16(info, SSR, status); /* clear pending */
2154
2155 info->irq_occurred = true;
2156
2157 if (info->params.mode == MGSL_MODE_ASYNC) {
2158 if (status & IRQ_TXIDLE) {
2159 if (info->tx_active)
2160 isr_txeom(info, status);
2161 }
2162 if (info->rx_pio && (status & IRQ_RXDATA))
2163 isr_rxdata(info);
2164 if ((status & IRQ_RXBREAK) && (status & RXBREAK)) {
2165 info->icount.brk++;
2166 /* process break detection if tty control allows */
2167 if (info->port.tty) {
2168 if (!(status & info->ignore_status_mask)) {
2169 if (info->read_status_mask & MASK_BREAK) {
2170 tty_insert_flip_char(&info->port, 0, TTY_BREAK);
2171 if (info->port.flags & ASYNC_SAK)
2172 do_SAK(info->port.tty);
2173 }
2174 }
2175 }
2176 }
2177 } else {
2178 if (status & (IRQ_TXIDLE + IRQ_TXUNDER))
2179 isr_txeom(info, status);
2180 if (info->rx_pio && (status & IRQ_RXDATA))
2181 isr_rxdata(info);
2182 if (status & IRQ_RXIDLE) {
2183 if (status & RXIDLE)
2184 info->icount.rxidle++;
2185 else
2186 info->icount.exithunt++;
2187 wake_up_interruptible(&info->event_wait_q);
2188 }
2189
2190 if (status & IRQ_RXOVER)
2191 rx_start(info);
2192 }
2193
2194 if (status & IRQ_DSR)
2195 dsr_change(info, status);
2196 if (status & IRQ_CTS)
2197 cts_change(info, status);
2198 if (status & IRQ_DCD)
2199 dcd_change(info, status);
2200 if (status & IRQ_RI)
2201 ri_change(info, status);
2202 }
2203
2204 static void isr_rdma(struct slgt_info *info)
2205 {
2206 unsigned int status = rd_reg32(info, RDCSR);
2207
2208 DBGISR(("%s isr_rdma status=%08x\n", info->device_name, status));
2209
2210 /* RDCSR (rx DMA control/status)
2211 *
2212 * 31..07 reserved
2213 * 06 save status byte to DMA buffer
2214 * 05 error
2215 * 04 eol (end of list)
2216 * 03 eob (end of buffer)
2217 * 02 IRQ enable
2218 * 01 reset
2219 * 00 enable
2220 */
2221 wr_reg32(info, RDCSR, status); /* clear pending */
2222
2223 if (status & (BIT5 + BIT4)) {
2224 DBGISR(("%s isr_rdma rx_restart=1\n", info->device_name));
2225 info->rx_restart = true;
2226 }
2227 info->pending_bh |= BH_RECEIVE;
2228 }
2229
2230 static void isr_tdma(struct slgt_info *info)
2231 {
2232 unsigned int status = rd_reg32(info, TDCSR);
2233
2234 DBGISR(("%s isr_tdma status=%08x\n", info->device_name, status));
2235
2236 /* TDCSR (tx DMA control/status)
2237 *
2238 * 31..06 reserved
2239 * 05 error
2240 * 04 eol (end of list)
2241 * 03 eob (end of buffer)
2242 * 02 IRQ enable
2243 * 01 reset
2244 * 00 enable
2245 */
2246 wr_reg32(info, TDCSR, status); /* clear pending */
2247
2248 if (status & (BIT5 + BIT4 + BIT3)) {
2249 // another transmit buffer has completed
2250 // run bottom half to get more send data from user
2251 info->pending_bh |= BH_TRANSMIT;
2252 }
2253 }
2254
2255 /*
2256 * return true if there are unsent tx DMA buffers, otherwise false
2257 *
2258 * if there are unsent buffers then info->tbuf_start
2259 * is set to index of first unsent buffer
2260 */
2261 static bool unsent_tbufs(struct slgt_info *info)
2262 {
2263 unsigned int i = info->tbuf_current;
2264 bool rc = false;
2265
2266 /*
2267 * search backwards from last loaded buffer (precedes tbuf_current)
2268 * for first unsent buffer (desc_count > 0)
2269 */
2270
2271 do {
2272 if (i)
2273 i--;
2274 else
2275 i = info->tbuf_count - 1;
2276 if (!desc_count(info->tbufs[i]))
2277 break;
2278 info->tbuf_start = i;
2279 rc = true;
2280 } while (i != info->tbuf_current);
2281
2282 return rc;
2283 }
2284
2285 static void isr_txeom(struct slgt_info *info, unsigned short status)
2286 {
2287 DBGISR(("%s txeom status=%04x\n", info->device_name, status));
2288
2289 slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
2290 tdma_reset(info);
2291 if (status & IRQ_TXUNDER) {
2292 unsigned short val = rd_reg16(info, TCR);
2293 wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
2294 wr_reg16(info, TCR, val); /* clear reset bit */
2295 }
2296
2297 if (info->tx_active) {
2298 if (info->params.mode != MGSL_MODE_ASYNC) {
2299 if (status & IRQ_TXUNDER)
2300 info->icount.txunder++;
2301 else if (status & IRQ_TXIDLE)
2302 info->icount.txok++;
2303 }
2304
2305 if (unsent_tbufs(info)) {
2306 tx_start(info);
2307 update_tx_timer(info);
2308 return;
2309 }
2310 info->tx_active = false;
2311
2312 del_timer(&info->tx_timer);
2313
2314 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done) {
2315 info->signals &= ~SerialSignal_RTS;
2316 info->drop_rts_on_tx_done = false;
2317 set_signals(info);
2318 }
2319
2320 #if SYNCLINK_GENERIC_HDLC
2321 if (info->netcount)
2322 hdlcdev_tx_done(info);
2323 else
2324 #endif
2325 {
2326 if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
2327 tx_stop(info);
2328 return;
2329 }
2330 info->pending_bh |= BH_TRANSMIT;
2331 }
2332 }
2333 }
2334
2335 static void isr_gpio(struct slgt_info *info, unsigned int changed, unsigned int state)
2336 {
2337 struct cond_wait *w, *prev;
2338
2339 /* wake processes waiting for specific transitions */
2340 for (w = info->gpio_wait_q, prev = NULL ; w != NULL ; w = w->next) {
2341 if (w->data & changed) {
2342 w->data = state;
2343 wake_up_interruptible(&w->q);
2344 if (prev != NULL)
2345 prev->next = w->next;
2346 else
2347 info->gpio_wait_q = w->next;
2348 } else
2349 prev = w;
2350 }
2351 }
2352
2353 /* interrupt service routine
2354 *
2355 * irq interrupt number
2356 * dev_id device ID supplied during interrupt registration
2357 */
2358 static irqreturn_t slgt_interrupt(int dummy, void *dev_id)
2359 {
2360 struct slgt_info *info = dev_id;
2361 unsigned int gsr;
2362 unsigned int i;
2363
2364 DBGISR(("slgt_interrupt irq=%d entry\n", info->irq_level));
2365
2366 while((gsr = rd_reg32(info, GSR) & 0xffffff00)) {
2367 DBGISR(("%s gsr=%08x\n", info->device_name, gsr));
2368 info->irq_occurred = true;
2369 for(i=0; i < info->port_count ; i++) {
2370 if (info->port_array[i] == NULL)
2371 continue;
2372 spin_lock(&info->port_array[i]->lock);
2373 if (gsr & (BIT8 << i))
2374 isr_serial(info->port_array[i]);
2375 if (gsr & (BIT16 << (i*2)))
2376 isr_rdma(info->port_array[i]);
2377 if (gsr & (BIT17 << (i*2)))
2378 isr_tdma(info->port_array[i]);
2379 spin_unlock(&info->port_array[i]->lock);
2380 }
2381 }
2382
2383 if (info->gpio_present) {
2384 unsigned int state;
2385 unsigned int changed;
2386 spin_lock(&info->lock);
2387 while ((changed = rd_reg32(info, IOSR)) != 0) {
2388 DBGISR(("%s iosr=%08x\n", info->device_name, changed));
2389 /* read latched state of GPIO signals */
2390 state = rd_reg32(info, IOVR);
2391 /* clear pending GPIO interrupt bits */
2392 wr_reg32(info, IOSR, changed);
2393 for (i=0 ; i < info->port_count ; i++) {
2394 if (info->port_array[i] != NULL)
2395 isr_gpio(info->port_array[i], changed, state);
2396 }
2397 }
2398 spin_unlock(&info->lock);
2399 }
2400
2401 for(i=0; i < info->port_count ; i++) {
2402 struct slgt_info *port = info->port_array[i];
2403 if (port == NULL)
2404 continue;
2405 spin_lock(&port->lock);
2406 if ((port->port.count || port->netcount) &&
2407 port->pending_bh && !port->bh_running &&
2408 !port->bh_requested) {
2409 DBGISR(("%s bh queued\n", port->device_name));
2410 schedule_work(&port->task);
2411 port->bh_requested = true;
2412 }
2413 spin_unlock(&port->lock);
2414 }
2415
2416 DBGISR(("slgt_interrupt irq=%d exit\n", info->irq_level));
2417 return IRQ_HANDLED;
2418 }
2419
2420 static int startup(struct slgt_info *info)
2421 {
2422 DBGINFO(("%s startup\n", info->device_name));
2423
2424 if (tty_port_initialized(&info->port))
2425 return 0;
2426
2427 if (!info->tx_buf) {
2428 info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
2429 if (!info->tx_buf) {
2430 DBGERR(("%s can't allocate tx buffer\n", info->device_name));
2431 return -ENOMEM;
2432 }
2433 }
2434
2435 info->pending_bh = 0;
2436
2437 memset(&info->icount, 0, sizeof(info->icount));
2438
2439 /* program hardware for current parameters */
2440 change_params(info);
2441
2442 if (info->port.tty)
2443 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
2444
2445 tty_port_set_initialized(&info->port, 1);
2446
2447 return 0;
2448 }
2449
2450 /*
2451 * called by close() and hangup() to shutdown hardware
2452 */
2453 static void shutdown(struct slgt_info *info)
2454 {
2455 unsigned long flags;
2456
2457 if (!tty_port_initialized(&info->port))
2458 return;
2459
2460 DBGINFO(("%s shutdown\n", info->device_name));
2461
2462 /* clear status wait queue because status changes */
2463 /* can't happen after shutting down the hardware */
2464 wake_up_interruptible(&info->status_event_wait_q);
2465 wake_up_interruptible(&info->event_wait_q);
2466
2467 del_timer_sync(&info->tx_timer);
2468 del_timer_sync(&info->rx_timer);
2469
2470 kfree(info->tx_buf);
2471 info->tx_buf = NULL;
2472
2473 spin_lock_irqsave(&info->lock,flags);
2474
2475 tx_stop(info);
2476 rx_stop(info);
2477
2478 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
2479
2480 if (!info->port.tty || info->port.tty->termios.c_cflag & HUPCL) {
2481 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
2482 set_signals(info);
2483 }
2484
2485 flush_cond_wait(&info->gpio_wait_q);
2486
2487 spin_unlock_irqrestore(&info->lock,flags);
2488
2489 if (info->port.tty)
2490 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
2491
2492 tty_port_set_initialized(&info->port, 0);
2493 }
2494
2495 static void program_hw(struct slgt_info *info)
2496 {
2497 unsigned long flags;
2498
2499 spin_lock_irqsave(&info->lock,flags);
2500
2501 rx_stop(info);
2502 tx_stop(info);
2503
2504 if (info->params.mode != MGSL_MODE_ASYNC ||
2505 info->netcount)
2506 sync_mode(info);
2507 else
2508 async_mode(info);
2509
2510 set_signals(info);
2511
2512 info->dcd_chkcount = 0;
2513 info->cts_chkcount = 0;
2514 info->ri_chkcount = 0;
2515 info->dsr_chkcount = 0;
2516
2517 slgt_irq_on(info, IRQ_DCD | IRQ_CTS | IRQ_DSR | IRQ_RI);
2518 get_signals(info);
2519
2520 if (info->netcount ||
2521 (info->port.tty && info->port.tty->termios.c_cflag & CREAD))
2522 rx_start(info);
2523
2524 spin_unlock_irqrestore(&info->lock,flags);
2525 }
2526
2527 /*
2528 * reconfigure adapter based on new parameters
2529 */
2530 static void change_params(struct slgt_info *info)
2531 {
2532 unsigned cflag;
2533 int bits_per_char;
2534
2535 if (!info->port.tty)
2536 return;
2537 DBGINFO(("%s change_params\n", info->device_name));
2538
2539 cflag = info->port.tty->termios.c_cflag;
2540
2541 /* if B0 rate (hangup) specified then negate RTS and DTR */
2542 /* otherwise assert RTS and DTR */
2543 if (cflag & CBAUD)
2544 info->signals |= SerialSignal_RTS | SerialSignal_DTR;
2545 else
2546 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
2547
2548 /* byte size and parity */
2549
2550 switch (cflag & CSIZE) {
2551 case CS5: info->params.data_bits = 5; break;
2552 case CS6: info->params.data_bits = 6; break;
2553 case CS7: info->params.data_bits = 7; break;
2554 case CS8: info->params.data_bits = 8; break;
2555 default: info->params.data_bits = 7; break;
2556 }
2557
2558 info->params.stop_bits = (cflag & CSTOPB) ? 2 : 1;
2559
2560 if (cflag & PARENB)
2561 info->params.parity = (cflag & PARODD) ? ASYNC_PARITY_ODD : ASYNC_PARITY_EVEN;
2562 else
2563 info->params.parity = ASYNC_PARITY_NONE;
2564
2565 /* calculate number of jiffies to transmit a full
2566 * FIFO (32 bytes) at specified data rate
2567 */
2568 bits_per_char = info->params.data_bits +
2569 info->params.stop_bits + 1;
2570
2571 info->params.data_rate = tty_get_baud_rate(info->port.tty);
2572
2573 if (info->params.data_rate) {
2574 info->timeout = (32*HZ*bits_per_char) /
2575 info->params.data_rate;
2576 }
2577 info->timeout += HZ/50; /* Add .02 seconds of slop */
2578
2579 tty_port_set_cts_flow(&info->port, cflag & CRTSCTS);
2580 tty_port_set_check_carrier(&info->port, ~cflag & CLOCAL);
2581
2582 /* process tty input control flags */
2583
2584 info->read_status_mask = IRQ_RXOVER;
2585 if (I_INPCK(info->port.tty))
2586 info->read_status_mask |= MASK_PARITY | MASK_FRAMING;
2587 if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
2588 info->read_status_mask |= MASK_BREAK;
2589 if (I_IGNPAR(info->port.tty))
2590 info->ignore_status_mask |= MASK_PARITY | MASK_FRAMING;
2591 if (I_IGNBRK(info->port.tty)) {
2592 info->ignore_status_mask |= MASK_BREAK;
2593 /* If ignoring parity and break indicators, ignore
2594 * overruns too. (For real raw support).
2595 */
2596 if (I_IGNPAR(info->port.tty))
2597 info->ignore_status_mask |= MASK_OVERRUN;
2598 }
2599
2600 program_hw(info);
2601 }
2602
2603 static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount)
2604 {
2605 DBGINFO(("%s get_stats\n", info->device_name));
2606 if (!user_icount) {
2607 memset(&info->icount, 0, sizeof(info->icount));
2608 } else {
2609 if (copy_to_user(user_icount, &info->icount, sizeof(struct mgsl_icount)))
2610 return -EFAULT;
2611 }
2612 return 0;
2613 }
2614
2615 static int get_params(struct slgt_info *info, MGSL_PARAMS __user *user_params)
2616 {
2617 DBGINFO(("%s get_params\n", info->device_name));
2618 if (copy_to_user(user_params, &info->params, sizeof(MGSL_PARAMS)))
2619 return -EFAULT;
2620 return 0;
2621 }
2622
2623 static int set_params(struct slgt_info *info, MGSL_PARAMS __user *new_params)
2624 {
2625 unsigned long flags;
2626 MGSL_PARAMS tmp_params;
2627
2628 DBGINFO(("%s set_params\n", info->device_name));
2629 if (copy_from_user(&tmp_params, new_params, sizeof(MGSL_PARAMS)))
2630 return -EFAULT;
2631
2632 spin_lock_irqsave(&info->lock, flags);
2633 if (tmp_params.mode == MGSL_MODE_BASE_CLOCK)
2634 info->base_clock = tmp_params.clock_speed;
2635 else
2636 memcpy(&info->params, &tmp_params, sizeof(MGSL_PARAMS));
2637 spin_unlock_irqrestore(&info->lock, flags);
2638
2639 program_hw(info);
2640
2641 return 0;
2642 }
2643
2644 static int get_txidle(struct slgt_info *info, int __user *idle_mode)
2645 {
2646 DBGINFO(("%s get_txidle=%d\n", info->device_name, info->idle_mode));
2647 if (put_user(info->idle_mode, idle_mode))
2648 return -EFAULT;
2649 return 0;
2650 }
2651
2652 static int set_txidle(struct slgt_info *info, int idle_mode)
2653 {
2654 unsigned long flags;
2655 DBGINFO(("%s set_txidle(%d)\n", info->device_name, idle_mode));
2656 spin_lock_irqsave(&info->lock,flags);
2657 info->idle_mode = idle_mode;
2658 if (info->params.mode != MGSL_MODE_ASYNC)
2659 tx_set_idle(info);
2660 spin_unlock_irqrestore(&info->lock,flags);
2661 return 0;
2662 }
2663
2664 static int tx_enable(struct slgt_info *info, int enable)
2665 {
2666 unsigned long flags;
2667 DBGINFO(("%s tx_enable(%d)\n", info->device_name, enable));
2668 spin_lock_irqsave(&info->lock,flags);
2669 if (enable) {
2670 if (!info->tx_enabled)
2671 tx_start(info);
2672 } else {
2673 if (info->tx_enabled)
2674 tx_stop(info);
2675 }
2676 spin_unlock_irqrestore(&info->lock,flags);
2677 return 0;
2678 }
2679
2680 /*
2681 * abort transmit HDLC frame
2682 */
2683 static int tx_abort(struct slgt_info *info)
2684 {
2685 unsigned long flags;
2686 DBGINFO(("%s tx_abort\n", info->device_name));
2687 spin_lock_irqsave(&info->lock,flags);
2688 tdma_reset(info);
2689 spin_unlock_irqrestore(&info->lock,flags);
2690 return 0;
2691 }
2692
2693 static int rx_enable(struct slgt_info *info, int enable)
2694 {
2695 unsigned long flags;
2696 unsigned int rbuf_fill_level;
2697 DBGINFO(("%s rx_enable(%08x)\n", info->device_name, enable));
2698 spin_lock_irqsave(&info->lock,flags);
2699 /*
2700 * enable[31..16] = receive DMA buffer fill level
2701 * 0 = noop (leave fill level unchanged)
2702 * fill level must be multiple of 4 and <= buffer size
2703 */
2704 rbuf_fill_level = ((unsigned int)enable) >> 16;
2705 if (rbuf_fill_level) {
2706 if ((rbuf_fill_level > DMABUFSIZE) || (rbuf_fill_level % 4)) {
2707 spin_unlock_irqrestore(&info->lock, flags);
2708 return -EINVAL;
2709 }
2710 info->rbuf_fill_level = rbuf_fill_level;
2711 if (rbuf_fill_level < 128)
2712 info->rx_pio = 1; /* PIO mode */
2713 else
2714 info->rx_pio = 0; /* DMA mode */
2715 rx_stop(info); /* restart receiver to use new fill level */
2716 }
2717
2718 /*
2719 * enable[1..0] = receiver enable command
2720 * 0 = disable
2721 * 1 = enable
2722 * 2 = enable or force hunt mode if already enabled
2723 */
2724 enable &= 3;
2725 if (enable) {
2726 if (!info->rx_enabled)
2727 rx_start(info);
2728 else if (enable == 2) {
2729 /* force hunt mode (write 1 to RCR[3]) */
2730 wr_reg16(info, RCR, rd_reg16(info, RCR) | BIT3);
2731 }
2732 } else {
2733 if (info->rx_enabled)
2734 rx_stop(info);
2735 }
2736 spin_unlock_irqrestore(&info->lock,flags);
2737 return 0;
2738 }
2739
2740 /*
2741 * wait for specified event to occur
2742 */
2743 static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr)
2744 {
2745 unsigned long flags;
2746 int s;
2747 int rc=0;
2748 struct mgsl_icount cprev, cnow;
2749 int events;
2750 int mask;
2751 struct _input_signal_events oldsigs, newsigs;
2752 DECLARE_WAITQUEUE(wait, current);
2753
2754 if (get_user(mask, mask_ptr))
2755 return -EFAULT;
2756
2757 DBGINFO(("%s wait_mgsl_event(%d)\n", info->device_name, mask));
2758
2759 spin_lock_irqsave(&info->lock,flags);
2760
2761 /* return immediately if state matches requested events */
2762 get_signals(info);
2763 s = info->signals;
2764
2765 events = mask &
2766 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
2767 ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
2768 ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
2769 ((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) );
2770 if (events) {
2771 spin_unlock_irqrestore(&info->lock,flags);
2772 goto exit;
2773 }
2774
2775 /* save current irq counts */
2776 cprev = info->icount;
2777 oldsigs = info->input_signal_events;
2778
2779 /* enable hunt and idle irqs if needed */
2780 if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
2781 unsigned short val = rd_reg16(info, SCR);
2782 if (!(val & IRQ_RXIDLE))
2783 wr_reg16(info, SCR, (unsigned short)(val | IRQ_RXIDLE));
2784 }
2785
2786 set_current_state(TASK_INTERRUPTIBLE);
2787 add_wait_queue(&info->event_wait_q, &wait);
2788
2789 spin_unlock_irqrestore(&info->lock,flags);
2790
2791 for(;;) {
2792 schedule();
2793 if (signal_pending(current)) {
2794 rc = -ERESTARTSYS;
2795 break;
2796 }
2797
2798 /* get current irq counts */
2799 spin_lock_irqsave(&info->lock,flags);
2800 cnow = info->icount;
2801 newsigs = info->input_signal_events;
2802 set_current_state(TASK_INTERRUPTIBLE);
2803 spin_unlock_irqrestore(&info->lock,flags);
2804
2805 /* if no change, wait aborted for some reason */
2806 if (newsigs.dsr_up == oldsigs.dsr_up &&
2807 newsigs.dsr_down == oldsigs.dsr_down &&
2808 newsigs.dcd_up == oldsigs.dcd_up &&
2809 newsigs.dcd_down == oldsigs.dcd_down &&
2810 newsigs.cts_up == oldsigs.cts_up &&
2811 newsigs.cts_down == oldsigs.cts_down &&
2812 newsigs.ri_up == oldsigs.ri_up &&
2813 newsigs.ri_down == oldsigs.ri_down &&
2814 cnow.exithunt == cprev.exithunt &&
2815 cnow.rxidle == cprev.rxidle) {
2816 rc = -EIO;
2817 break;
2818 }
2819
2820 events = mask &
2821 ( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) +
2822 (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2823 (newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) +
2824 (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2825 (newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) +
2826 (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2827 (newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) +
2828 (newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) +
2829 (cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) +
2830 (cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) );
2831 if (events)
2832 break;
2833
2834 cprev = cnow;
2835 oldsigs = newsigs;
2836 }
2837
2838 remove_wait_queue(&info->event_wait_q, &wait);
2839 set_current_state(TASK_RUNNING);
2840
2841
2842 if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2843 spin_lock_irqsave(&info->lock,flags);
2844 if (!waitqueue_active(&info->event_wait_q)) {
2845 /* disable enable exit hunt mode/idle rcvd IRQs */
2846 wr_reg16(info, SCR,
2847 (unsigned short)(rd_reg16(info, SCR) & ~IRQ_RXIDLE));
2848 }
2849 spin_unlock_irqrestore(&info->lock,flags);
2850 }
2851 exit:
2852 if (rc == 0)
2853 rc = put_user(events, mask_ptr);
2854 return rc;
2855 }
2856
2857 static int get_interface(struct slgt_info *info, int __user *if_mode)
2858 {
2859 DBGINFO(("%s get_interface=%x\n", info->device_name, info->if_mode));
2860 if (put_user(info->if_mode, if_mode))
2861 return -EFAULT;
2862 return 0;
2863 }
2864
2865 static int set_interface(struct slgt_info *info, int if_mode)
2866 {
2867 unsigned long flags;
2868 unsigned short val;
2869
2870 DBGINFO(("%s set_interface=%x)\n", info->device_name, if_mode));
2871 spin_lock_irqsave(&info->lock,flags);
2872 info->if_mode = if_mode;
2873
2874 msc_set_vcr(info);
2875
2876 /* TCR (tx control) 07 1=RTS driver control */
2877 val = rd_reg16(info, TCR);
2878 if (info->if_mode & MGSL_INTERFACE_RTS_EN)
2879 val |= BIT7;
2880 else
2881 val &= ~BIT7;
2882 wr_reg16(info, TCR, val);
2883
2884 spin_unlock_irqrestore(&info->lock,flags);
2885 return 0;
2886 }
2887
2888 static int get_xsync(struct slgt_info *info, int __user *xsync)
2889 {
2890 DBGINFO(("%s get_xsync=%x\n", info->device_name, info->xsync));
2891 if (put_user(info->xsync, xsync))
2892 return -EFAULT;
2893 return 0;
2894 }
2895
2896 /*
2897 * set extended sync pattern (1 to 4 bytes) for extended sync mode
2898 *
2899 * sync pattern is contained in least significant bytes of value
2900 * most significant byte of sync pattern is oldest (1st sent/detected)
2901 */
2902 static int set_xsync(struct slgt_info *info, int xsync)
2903 {
2904 unsigned long flags;
2905
2906 DBGINFO(("%s set_xsync=%x)\n", info->device_name, xsync));
2907 spin_lock_irqsave(&info->lock, flags);
2908 info->xsync = xsync;
2909 wr_reg32(info, XSR, xsync);
2910 spin_unlock_irqrestore(&info->lock, flags);
2911 return 0;
2912 }
2913
2914 static int get_xctrl(struct slgt_info *info, int __user *xctrl)
2915 {
2916 DBGINFO(("%s get_xctrl=%x\n", info->device_name, info->xctrl));
2917 if (put_user(info->xctrl, xctrl))
2918 return -EFAULT;
2919 return 0;
2920 }
2921
2922 /*
2923 * set extended control options
2924 *
2925 * xctrl[31:19] reserved, must be zero
2926 * xctrl[18:17] extended sync pattern length in bytes
2927 * 00 = 1 byte in xsr[7:0]
2928 * 01 = 2 bytes in xsr[15:0]
2929 * 10 = 3 bytes in xsr[23:0]
2930 * 11 = 4 bytes in xsr[31:0]
2931 * xctrl[16] 1 = enable terminal count, 0=disabled
2932 * xctrl[15:0] receive terminal count for fixed length packets
2933 * value is count minus one (0 = 1 byte packet)
2934 * when terminal count is reached, receiver
2935 * automatically returns to hunt mode and receive
2936 * FIFO contents are flushed to DMA buffers with
2937 * end of frame (EOF) status
2938 */
2939 static int set_xctrl(struct slgt_info *info, int xctrl)
2940 {
2941 unsigned long flags;
2942
2943 DBGINFO(("%s set_xctrl=%x)\n", info->device_name, xctrl));
2944 spin_lock_irqsave(&info->lock, flags);
2945 info->xctrl = xctrl;
2946 wr_reg32(info, XCR, xctrl);
2947 spin_unlock_irqrestore(&info->lock, flags);
2948 return 0;
2949 }
2950
2951 /*
2952 * set general purpose IO pin state and direction
2953 *
2954 * user_gpio fields:
2955 * state each bit indicates a pin state
2956 * smask set bit indicates pin state to set
2957 * dir each bit indicates a pin direction (0=input, 1=output)
2958 * dmask set bit indicates pin direction to set
2959 */
2960 static int set_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2961 {
2962 unsigned long flags;
2963 struct gpio_desc gpio;
2964 __u32 data;
2965
2966 if (!info->gpio_present)
2967 return -EINVAL;
2968 if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
2969 return -EFAULT;
2970 DBGINFO(("%s set_gpio state=%08x smask=%08x dir=%08x dmask=%08x\n",
2971 info->device_name, gpio.state, gpio.smask,
2972 gpio.dir, gpio.dmask));
2973
2974 spin_lock_irqsave(&info->port_array[0]->lock, flags);
2975 if (gpio.dmask) {
2976 data = rd_reg32(info, IODR);
2977 data |= gpio.dmask & gpio.dir;
2978 data &= ~(gpio.dmask & ~gpio.dir);
2979 wr_reg32(info, IODR, data);
2980 }
2981 if (gpio.smask) {
2982 data = rd_reg32(info, IOVR);
2983 data |= gpio.smask & gpio.state;
2984 data &= ~(gpio.smask & ~gpio.state);
2985 wr_reg32(info, IOVR, data);
2986 }
2987 spin_unlock_irqrestore(&info->port_array[0]->lock, flags);
2988
2989 return 0;
2990 }
2991
2992 /*
2993 * get general purpose IO pin state and direction
2994 */
2995 static int get_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2996 {
2997 struct gpio_desc gpio;
2998 if (!info->gpio_present)
2999 return -EINVAL;
3000 gpio.state = rd_reg32(info, IOVR);
3001 gpio.smask = 0xffffffff;
3002 gpio.dir = rd_reg32(info, IODR);
3003 gpio.dmask = 0xffffffff;
3004 if (copy_to_user(user_gpio, &gpio, sizeof(gpio)))
3005 return -EFAULT;
3006 DBGINFO(("%s get_gpio state=%08x dir=%08x\n",
3007 info->device_name, gpio.state, gpio.dir));
3008 return 0;
3009 }
3010
3011 /*
3012 * conditional wait facility
3013 */
3014 static void init_cond_wait(struct cond_wait *w, unsigned int data)
3015 {
3016 init_waitqueue_head(&w->q);
3017 init_waitqueue_entry(&w->wait, current);
3018 w->data = data;
3019 }
3020
3021 static void add_cond_wait(struct cond_wait **head, struct cond_wait *w)
3022 {
3023 set_current_state(TASK_INTERRUPTIBLE);
3024 add_wait_queue(&w->q, &w->wait);
3025 w->next = *head;
3026 *head = w;
3027 }
3028
3029 static void remove_cond_wait(struct cond_wait **head, struct cond_wait *cw)
3030 {
3031 struct cond_wait *w, *prev;
3032 remove_wait_queue(&cw->q, &cw->wait);
3033 set_current_state(TASK_RUNNING);
3034 for (w = *head, prev = NULL ; w != NULL ; prev = w, w = w->next) {
3035 if (w == cw) {
3036 if (prev != NULL)
3037 prev->next = w->next;
3038 else
3039 *head = w->next;
3040 break;
3041 }
3042 }
3043 }
3044
3045 static void flush_cond_wait(struct cond_wait **head)
3046 {
3047 while (*head != NULL) {
3048 wake_up_interruptible(&(*head)->q);
3049 *head = (*head)->next;
3050 }
3051 }
3052
3053 /*
3054 * wait for general purpose I/O pin(s) to enter specified state
3055 *
3056 * user_gpio fields:
3057 * state - bit indicates target pin state
3058 * smask - set bit indicates watched pin
3059 *
3060 * The wait ends when at least one watched pin enters the specified
3061 * state. When 0 (no error) is returned, user_gpio->state is set to the
3062 * state of all GPIO pins when the wait ends.
3063 *
3064 * Note: Each pin may be a dedicated input, dedicated output, or
3065 * configurable input/output. The number and configuration of pins
3066 * varies with the specific adapter model. Only input pins (dedicated
3067 * or configured) can be monitored with this function.
3068 */
3069 static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
3070 {
3071 unsigned long flags;
3072 int rc = 0;
3073 struct gpio_desc gpio;
3074 struct cond_wait wait;
3075 u32 state;
3076
3077 if (!info->gpio_present)
3078 return -EINVAL;
3079 if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
3080 return -EFAULT;
3081 DBGINFO(("%s wait_gpio() state=%08x smask=%08x\n",
3082 info->device_name, gpio.state, gpio.smask));
3083 /* ignore output pins identified by set IODR bit */
3084 if ((gpio.smask &= ~rd_reg32(info, IODR)) == 0)
3085 return -EINVAL;
3086 init_cond_wait(&wait, gpio.smask);
3087
3088 spin_lock_irqsave(&info->port_array[0]->lock, flags);
3089 /* enable interrupts for watched pins */
3090 wr_reg32(info, IOER, rd_reg32(info, IOER) | gpio.smask);
3091 /* get current pin states */
3092 state = rd_reg32(info, IOVR);
3093
3094 if (gpio.smask & ~(state ^ gpio.state)) {
3095 /* already in target state */
3096 gpio.state = state;
3097 } else {
3098 /* wait for target state */
3099 add_cond_wait(&info->gpio_wait_q, &wait);
3100 spin_unlock_irqrestore(&info->port_array[0]->lock, flags);
3101 schedule();
3102 if (signal_pending(current))
3103 rc = -ERESTARTSYS;
3104 else
3105 gpio.state = wait.data;
3106 spin_lock_irqsave(&info->port_array[0]->lock, flags);
3107 remove_cond_wait(&info->gpio_wait_q, &wait);
3108 }
3109
3110 /* disable all GPIO interrupts if no waiting processes */
3111 if (info->gpio_wait_q == NULL)
3112 wr_reg32(info, IOER, 0);
3113 spin_unlock_irqrestore(&info->port_array[0]->lock, flags);
3114
3115 if ((rc == 0) && copy_to_user(user_gpio, &gpio, sizeof(gpio)))
3116 rc = -EFAULT;
3117 return rc;
3118 }
3119
3120 static int modem_input_wait(struct slgt_info *info,int arg)
3121 {
3122 unsigned long flags;
3123 int rc;
3124 struct mgsl_icount cprev, cnow;
3125 DECLARE_WAITQUEUE(wait, current);
3126
3127 /* save current irq counts */
3128 spin_lock_irqsave(&info->lock,flags);
3129 cprev = info->icount;
3130 add_wait_queue(&info->status_event_wait_q, &wait);
3131 set_current_state(TASK_INTERRUPTIBLE);
3132 spin_unlock_irqrestore(&info->lock,flags);
3133
3134 for(;;) {
3135 schedule();
3136 if (signal_pending(current)) {
3137 rc = -ERESTARTSYS;
3138 break;
3139 }
3140
3141 /* get new irq counts */
3142 spin_lock_irqsave(&info->lock,flags);
3143 cnow = info->icount;
3144 set_current_state(TASK_INTERRUPTIBLE);
3145 spin_unlock_irqrestore(&info->lock,flags);
3146
3147 /* if no change, wait aborted for some reason */
3148 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
3149 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
3150 rc = -EIO;
3151 break;
3152 }
3153
3154 /* check for change in caller specified modem input */
3155 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
3156 (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
3157 (arg & TIOCM_CD && cnow.dcd != cprev.dcd) ||
3158 (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
3159 rc = 0;
3160 break;
3161 }
3162
3163 cprev = cnow;
3164 }
3165 remove_wait_queue(&info->status_event_wait_q, &wait);
3166 set_current_state(TASK_RUNNING);
3167 return rc;
3168 }
3169
3170 /*
3171 * return state of serial control and status signals
3172 */
3173 static int tiocmget(struct tty_struct *tty)
3174 {
3175 struct slgt_info *info = tty->driver_data;
3176 unsigned int result;
3177 unsigned long flags;
3178
3179 spin_lock_irqsave(&info->lock,flags);
3180 get_signals(info);
3181 spin_unlock_irqrestore(&info->lock,flags);
3182
3183 result = ((info->signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
3184 ((info->signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
3185 ((info->signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
3186 ((info->signals & SerialSignal_RI) ? TIOCM_RNG:0) +
3187 ((info->signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
3188 ((info->signals & SerialSignal_CTS) ? TIOCM_CTS:0);
3189
3190 DBGINFO(("%s tiocmget value=%08X\n", info->device_name, result));
3191 return result;
3192 }
3193
3194 /*
3195 * set modem control signals (DTR/RTS)
3196 *
3197 * cmd signal command: TIOCMBIS = set bit TIOCMBIC = clear bit
3198 * TIOCMSET = set/clear signal values
3199 * value bit mask for command
3200 */
3201 static int tiocmset(struct tty_struct *tty,
3202 unsigned int set, unsigned int clear)
3203 {
3204 struct slgt_info *info = tty->driver_data;
3205 unsigned long flags;
3206
3207 DBGINFO(("%s tiocmset(%x,%x)\n", info->device_name, set, clear));
3208
3209 if (set & TIOCM_RTS)
3210 info->signals |= SerialSignal_RTS;
3211 if (set & TIOCM_DTR)
3212 info->signals |= SerialSignal_DTR;
3213 if (clear & TIOCM_RTS)
3214 info->signals &= ~SerialSignal_RTS;
3215 if (clear & TIOCM_DTR)
3216 info->signals &= ~SerialSignal_DTR;
3217
3218 spin_lock_irqsave(&info->lock,flags);
3219 set_signals(info);
3220 spin_unlock_irqrestore(&info->lock,flags);
3221 return 0;
3222 }
3223
3224 static int carrier_raised(struct tty_port *port)
3225 {
3226 unsigned long flags;
3227 struct slgt_info *info = container_of(port, struct slgt_info, port);
3228
3229 spin_lock_irqsave(&info->lock,flags);
3230 get_signals(info);
3231 spin_unlock_irqrestore(&info->lock,flags);
3232 return (info->signals & SerialSignal_DCD) ? 1 : 0;
3233 }
3234
3235 static void dtr_rts(struct tty_port *port, int on)
3236 {
3237 unsigned long flags;
3238 struct slgt_info *info = container_of(port, struct slgt_info, port);
3239
3240 spin_lock_irqsave(&info->lock,flags);
3241 if (on)
3242 info->signals |= SerialSignal_RTS | SerialSignal_DTR;
3243 else
3244 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
3245 set_signals(info);
3246 spin_unlock_irqrestore(&info->lock,flags);
3247 }
3248
3249
3250 /*
3251 * block current process until the device is ready to open
3252 */
3253 static int block_til_ready(struct tty_struct *tty, struct file *filp,
3254 struct slgt_info *info)
3255 {
3256 DECLARE_WAITQUEUE(wait, current);
3257 int retval;
3258 bool do_clocal = false;
3259 unsigned long flags;
3260 int cd;
3261 struct tty_port *port = &info->port;
3262
3263 DBGINFO(("%s block_til_ready\n", tty->driver->name));
3264
3265 if (filp->f_flags & O_NONBLOCK || tty_io_error(tty)) {
3266 /* nonblock mode is set or port is not enabled */
3267 tty_port_set_active(port, 1);
3268 return 0;
3269 }
3270
3271 if (C_CLOCAL(tty))
3272 do_clocal = true;
3273
3274 /* Wait for carrier detect and the line to become
3275 * free (i.e., not in use by the callout). While we are in
3276 * this loop, port->count is dropped by one, so that
3277 * close() knows when to free things. We restore it upon
3278 * exit, either normal or abnormal.
3279 */
3280
3281 retval = 0;
3282 add_wait_queue(&port->open_wait, &wait);
3283
3284 spin_lock_irqsave(&info->lock, flags);
3285 port->count--;
3286 spin_unlock_irqrestore(&info->lock, flags);
3287 port->blocked_open++;
3288
3289 while (1) {
3290 if (C_BAUD(tty) && tty_port_initialized(port))
3291 tty_port_raise_dtr_rts(port);
3292
3293 set_current_state(TASK_INTERRUPTIBLE);
3294
3295 if (tty_hung_up_p(filp) || !tty_port_initialized(port)) {
3296 retval = (port->flags & ASYNC_HUP_NOTIFY) ?
3297 -EAGAIN : -ERESTARTSYS;
3298 break;
3299 }
3300
3301 cd = tty_port_carrier_raised(port);
3302 if (do_clocal || cd)
3303 break;
3304
3305 if (signal_pending(current)) {
3306 retval = -ERESTARTSYS;
3307 break;
3308 }
3309
3310 DBGINFO(("%s block_til_ready wait\n", tty->driver->name));
3311 tty_unlock(tty);
3312 schedule();
3313 tty_lock(tty);
3314 }
3315
3316 set_current_state(TASK_RUNNING);
3317 remove_wait_queue(&port->open_wait, &wait);
3318
3319 if (!tty_hung_up_p(filp))
3320 port->count++;
3321 port->blocked_open--;
3322
3323 if (!retval)
3324 tty_port_set_active(port, 1);
3325
3326 DBGINFO(("%s block_til_ready ready, rc=%d\n", tty->driver->name, retval));
3327 return retval;
3328 }
3329
3330 /*
3331 * allocate buffers used for calling line discipline receive_buf
3332 * directly in synchronous mode
3333 * note: add 5 bytes to max frame size to allow appending
3334 * 32-bit CRC and status byte when configured to do so
3335 */
3336 static int alloc_tmp_rbuf(struct slgt_info *info)
3337 {
3338 info->tmp_rbuf = kmalloc(info->max_frame_size + 5, GFP_KERNEL);
3339 if (info->tmp_rbuf == NULL)
3340 return -ENOMEM;
3341 /* unused flag buffer to satisfy receive_buf calling interface */
3342 info->flag_buf = kzalloc(info->max_frame_size + 5, GFP_KERNEL);
3343 if (!info->flag_buf) {
3344 kfree(info->tmp_rbuf);
3345 info->tmp_rbuf = NULL;
3346 return -ENOMEM;
3347 }
3348 return 0;
3349 }
3350
3351 static void free_tmp_rbuf(struct slgt_info *info)
3352 {
3353 kfree(info->tmp_rbuf);
3354 info->tmp_rbuf = NULL;
3355 kfree(info->flag_buf);
3356 info->flag_buf = NULL;
3357 }
3358
3359 /*
3360 * allocate DMA descriptor lists.
3361 */
3362 static int alloc_desc(struct slgt_info *info)
3363 {
3364 unsigned int i;
3365 unsigned int pbufs;
3366
3367 /* allocate memory to hold descriptor lists */
3368 info->bufs = pci_zalloc_consistent(info->pdev, DESC_LIST_SIZE,
3369 &info->bufs_dma_addr);
3370 if (info->bufs == NULL)
3371 return -ENOMEM;
3372
3373 info->rbufs = (struct slgt_desc*)info->bufs;
3374 info->tbufs = ((struct slgt_desc*)info->bufs) + info->rbuf_count;
3375
3376 pbufs = (unsigned int)info->bufs_dma_addr;
3377
3378 /*
3379 * Build circular lists of descriptors
3380 */
3381
3382 for (i=0; i < info->rbuf_count; i++) {
3383 /* physical address of this descriptor */
3384 info->rbufs[i].pdesc = pbufs + (i * sizeof(struct slgt_desc));
3385
3386 /* physical address of next descriptor */
3387 if (i == info->rbuf_count - 1)
3388 info->rbufs[i].next = cpu_to_le32(pbufs);
3389 else
3390 info->rbufs[i].next = cpu_to_le32(pbufs + ((i+1) * sizeof(struct slgt_desc)));
3391 set_desc_count(info->rbufs[i], DMABUFSIZE);
3392 }
3393
3394 for (i=0; i < info->tbuf_count; i++) {
3395 /* physical address of this descriptor */
3396 info->tbufs[i].pdesc = pbufs + ((info->rbuf_count + i) * sizeof(struct slgt_desc));
3397
3398 /* physical address of next descriptor */
3399 if (i == info->tbuf_count - 1)
3400 info->tbufs[i].next = cpu_to_le32(pbufs + info->rbuf_count * sizeof(struct slgt_desc));
3401 else
3402 info->tbufs[i].next = cpu_to_le32(pbufs + ((info->rbuf_count + i + 1) * sizeof(struct slgt_desc)));
3403 }
3404
3405 return 0;
3406 }
3407
3408 static void free_desc(struct slgt_info *info)
3409 {
3410 if (info->bufs != NULL) {
3411 pci_free_consistent(info->pdev, DESC_LIST_SIZE, info->bufs, info->bufs_dma_addr);
3412 info->bufs = NULL;
3413 info->rbufs = NULL;
3414 info->tbufs = NULL;
3415 }
3416 }
3417
3418 static int alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
3419 {
3420 int i;
3421 for (i=0; i < count; i++) {
3422 if ((bufs[i].buf = pci_alloc_consistent(info->pdev, DMABUFSIZE, &bufs[i].buf_dma_addr)) == NULL)
3423 return -ENOMEM;
3424 bufs[i].pbuf = cpu_to_le32((unsigned int)bufs[i].buf_dma_addr);
3425 }
3426 return 0;
3427 }
3428
3429 static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
3430 {
3431 int i;
3432 for (i=0; i < count; i++) {
3433 if (bufs[i].buf == NULL)
3434 continue;
3435 pci_free_consistent(info->pdev, DMABUFSIZE, bufs[i].buf, bufs[i].buf_dma_addr);
3436 bufs[i].buf = NULL;
3437 }
3438 }
3439
3440 static int alloc_dma_bufs(struct slgt_info *info)
3441 {
3442 info->rbuf_count = 32;
3443 info->tbuf_count = 32;
3444
3445 if (alloc_desc(info) < 0 ||
3446 alloc_bufs(info, info->rbufs, info->rbuf_count) < 0 ||
3447 alloc_bufs(info, info->tbufs, info->tbuf_count) < 0 ||
3448 alloc_tmp_rbuf(info) < 0) {
3449 DBGERR(("%s DMA buffer alloc fail\n", info->device_name));
3450 return -ENOMEM;
3451 }
3452 reset_rbufs(info);
3453 return 0;
3454 }
3455
3456 static void free_dma_bufs(struct slgt_info *info)
3457 {
3458 if (info->bufs) {
3459 free_bufs(info, info->rbufs, info->rbuf_count);
3460 free_bufs(info, info->tbufs, info->tbuf_count);
3461 free_desc(info);
3462 }
3463 free_tmp_rbuf(info);
3464 }
3465
3466 static int claim_resources(struct slgt_info *info)
3467 {
3468 if (request_mem_region(info->phys_reg_addr, SLGT_REG_SIZE, "synclink_gt") == NULL) {
3469 DBGERR(("%s reg addr conflict, addr=%08X\n",
3470 info->device_name, info->phys_reg_addr));
3471 info->init_error = DiagStatus_AddressConflict;
3472 goto errout;
3473 }
3474 else
3475 info->reg_addr_requested = true;
3476
3477 info->reg_addr = ioremap_nocache(info->phys_reg_addr, SLGT_REG_SIZE);
3478 if (!info->reg_addr) {
3479 DBGERR(("%s can't map device registers, addr=%08X\n",
3480 info->device_name, info->phys_reg_addr));
3481 info->init_error = DiagStatus_CantAssignPciResources;
3482 goto errout;
3483 }
3484 return 0;
3485
3486 errout:
3487 release_resources(info);
3488 return -ENODEV;
3489 }
3490
3491 static void release_resources(struct slgt_info *info)
3492 {
3493 if (info->irq_requested) {
3494 free_irq(info->irq_level, info);
3495 info->irq_requested = false;
3496 }
3497
3498 if (info->reg_addr_requested) {
3499 release_mem_region(info->phys_reg_addr, SLGT_REG_SIZE);
3500 info->reg_addr_requested = false;
3501 }
3502
3503 if (info->reg_addr) {
3504 iounmap(info->reg_addr);
3505 info->reg_addr = NULL;
3506 }
3507 }
3508
3509 /* Add the specified device instance data structure to the
3510 * global linked list of devices and increment the device count.
3511 */
3512 static void add_device(struct slgt_info *info)
3513 {
3514 char *devstr;
3515
3516 info->next_device = NULL;
3517 info->line = slgt_device_count;
3518 sprintf(info->device_name, "%s%d", tty_dev_prefix, info->line);
3519
3520 if (info->line < MAX_DEVICES) {
3521 if (maxframe[info->line])
3522 info->max_frame_size = maxframe[info->line];
3523 }
3524
3525 slgt_device_count++;
3526
3527 if (!slgt_device_list)
3528 slgt_device_list = info;
3529 else {
3530 struct slgt_info *current_dev = slgt_device_list;
3531 while(current_dev->next_device)
3532 current_dev = current_dev->next_device;
3533 current_dev->next_device = info;
3534 }
3535
3536 if (info->max_frame_size < 4096)
3537 info->max_frame_size = 4096;
3538 else if (info->max_frame_size > 65535)
3539 info->max_frame_size = 65535;
3540
3541 switch(info->pdev->device) {
3542 case SYNCLINK_GT_DEVICE_ID:
3543 devstr = "GT";
3544 break;
3545 case SYNCLINK_GT2_DEVICE_ID:
3546 devstr = "GT2";
3547 break;
3548 case SYNCLINK_GT4_DEVICE_ID:
3549 devstr = "GT4";
3550 break;
3551 case SYNCLINK_AC_DEVICE_ID:
3552 devstr = "AC";
3553 info->params.mode = MGSL_MODE_ASYNC;
3554 break;
3555 default:
3556 devstr = "(unknown model)";
3557 }
3558 printk("SyncLink %s %s IO=%08x IRQ=%d MaxFrameSize=%u\n",
3559 devstr, info->device_name, info->phys_reg_addr,
3560 info->irq_level, info->max_frame_size);
3561
3562 #if SYNCLINK_GENERIC_HDLC
3563 hdlcdev_init(info);
3564 #endif
3565 }
3566
3567 static const struct tty_port_operations slgt_port_ops = {
3568 .carrier_raised = carrier_raised,
3569 .dtr_rts = dtr_rts,
3570 };
3571
3572 /*
3573 * allocate device instance structure, return NULL on failure
3574 */
3575 static struct slgt_info *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev)
3576 {
3577 struct slgt_info *info;
3578
3579 info = kzalloc(sizeof(struct slgt_info), GFP_KERNEL);
3580
3581 if (!info) {
3582 DBGERR(("%s device alloc failed adapter=%d port=%d\n",
3583 driver_name, adapter_num, port_num));
3584 } else {
3585 tty_port_init(&info->port);
3586 info->port.ops = &slgt_port_ops;
3587 info->magic = MGSL_MAGIC;
3588 INIT_WORK(&info->task, bh_handler);
3589 info->max_frame_size = 4096;
3590 info->base_clock = 14745600;
3591 info->rbuf_fill_level = DMABUFSIZE;
3592 info->port.close_delay = 5*HZ/10;
3593 info->port.closing_wait = 30*HZ;
3594 init_waitqueue_head(&info->status_event_wait_q);
3595 init_waitqueue_head(&info->event_wait_q);
3596 spin_lock_init(&info->netlock);
3597 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
3598 info->idle_mode = HDLC_TXIDLE_FLAGS;
3599 info->adapter_num = adapter_num;
3600 info->port_num = port_num;
3601
3602 setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
3603 setup_timer(&info->rx_timer, rx_timeout, (unsigned long)info);
3604
3605 /* Copy configuration info to device instance data */
3606 info->pdev = pdev;
3607 info->irq_level = pdev->irq;
3608 info->phys_reg_addr = pci_resource_start(pdev,0);
3609
3610 info->bus_type = MGSL_BUS_TYPE_PCI;
3611 info->irq_flags = IRQF_SHARED;
3612
3613 info->init_error = -1; /* assume error, set to 0 on successful init */
3614 }
3615
3616 return info;
3617 }
3618
3619 static void device_init(int adapter_num, struct pci_dev *pdev)
3620 {
3621 struct slgt_info *port_array[SLGT_MAX_PORTS];
3622 int i;
3623 int port_count = 1;
3624
3625 if (pdev->device == SYNCLINK_GT2_DEVICE_ID)
3626 port_count = 2;
3627 else if (pdev->device == SYNCLINK_GT4_DEVICE_ID)
3628 port_count = 4;
3629
3630 /* allocate device instances for all ports */
3631 for (i=0; i < port_count; ++i) {
3632 port_array[i] = alloc_dev(adapter_num, i, pdev);
3633 if (port_array[i] == NULL) {
3634 for (--i; i >= 0; --i) {
3635 tty_port_destroy(&port_array[i]->port);
3636 kfree(port_array[i]);
3637 }
3638 return;
3639 }
3640 }
3641
3642 /* give copy of port_array to all ports and add to device list */
3643 for (i=0; i < port_count; ++i) {
3644 memcpy(port_array[i]->port_array, port_array, sizeof(port_array));
3645 add_device(port_array[i]);
3646 port_array[i]->port_count = port_count;
3647 spin_lock_init(&port_array[i]->lock);
3648 }
3649
3650 /* Allocate and claim adapter resources */
3651 if (!claim_resources(port_array[0])) {
3652
3653 alloc_dma_bufs(port_array[0]);
3654
3655 /* copy resource information from first port to others */
3656 for (i = 1; i < port_count; ++i) {
3657 port_array[i]->irq_level = port_array[0]->irq_level;
3658 port_array[i]->reg_addr = port_array[0]->reg_addr;
3659 alloc_dma_bufs(port_array[i]);
3660 }
3661
3662 if (request_irq(port_array[0]->irq_level,
3663 slgt_interrupt,
3664 port_array[0]->irq_flags,
3665 port_array[0]->device_name,
3666 port_array[0]) < 0) {
3667 DBGERR(("%s request_irq failed IRQ=%d\n",
3668 port_array[0]->device_name,
3669 port_array[0]->irq_level));
3670 } else {
3671 port_array[0]->irq_requested = true;
3672 adapter_test(port_array[0]);
3673 for (i=1 ; i < port_count ; i++) {
3674 port_array[i]->init_error = port_array[0]->init_error;
3675 port_array[i]->gpio_present = port_array[0]->gpio_present;
3676 }
3677 }
3678 }
3679
3680 for (i = 0; i < port_count; ++i) {
3681 struct slgt_info *info = port_array[i];
3682 tty_port_register_device(&info->port, serial_driver, info->line,
3683 &info->pdev->dev);
3684 }
3685 }
3686
3687 static int init_one(struct pci_dev *dev,
3688 const struct pci_device_id *ent)
3689 {
3690 if (pci_enable_device(dev)) {
3691 printk("error enabling pci device %p\n", dev);
3692 return -EIO;
3693 }
3694 pci_set_master(dev);
3695 device_init(slgt_device_count, dev);
3696 return 0;
3697 }
3698
3699 static void remove_one(struct pci_dev *dev)
3700 {
3701 }
3702
3703 static const struct tty_operations ops = {
3704 .open = open,
3705 .close = close,
3706 .write = write,
3707 .put_char = put_char,
3708 .flush_chars = flush_chars,
3709 .write_room = write_room,
3710 .chars_in_buffer = chars_in_buffer,
3711 .flush_buffer = flush_buffer,
3712 .ioctl = ioctl,
3713 .compat_ioctl = slgt_compat_ioctl,
3714 .throttle = throttle,
3715 .unthrottle = unthrottle,
3716 .send_xchar = send_xchar,
3717 .break_ctl = set_break,
3718 .wait_until_sent = wait_until_sent,
3719 .set_termios = set_termios,
3720 .stop = tx_hold,
3721 .start = tx_release,
3722 .hangup = hangup,
3723 .tiocmget = tiocmget,
3724 .tiocmset = tiocmset,
3725 .get_icount = get_icount,
3726 .proc_fops = &synclink_gt_proc_fops,
3727 };
3728
3729 static void slgt_cleanup(void)
3730 {
3731 int rc;
3732 struct slgt_info *info;
3733 struct slgt_info *tmp;
3734
3735 printk(KERN_INFO "unload %s\n", driver_name);
3736
3737 if (serial_driver) {
3738 for (info=slgt_device_list ; info != NULL ; info=info->next_device)
3739 tty_unregister_device(serial_driver, info->line);
3740 rc = tty_unregister_driver(serial_driver);
3741 if (rc)
3742 DBGERR(("tty_unregister_driver error=%d\n", rc));
3743 put_tty_driver(serial_driver);
3744 }
3745
3746 /* reset devices */
3747 info = slgt_device_list;
3748 while(info) {
3749 reset_port(info);
3750 info = info->next_device;
3751 }
3752
3753 /* release devices */
3754 info = slgt_device_list;
3755 while(info) {
3756 #if SYNCLINK_GENERIC_HDLC
3757 hdlcdev_exit(info);
3758 #endif
3759 free_dma_bufs(info);
3760 free_tmp_rbuf(info);
3761 if (info->port_num == 0)
3762 release_resources(info);
3763 tmp = info;
3764 info = info->next_device;
3765 tty_port_destroy(&tmp->port);
3766 kfree(tmp);
3767 }
3768
3769 if (pci_registered)
3770 pci_unregister_driver(&pci_driver);
3771 }
3772
3773 /*
3774 * Driver initialization entry point.
3775 */
3776 static int __init slgt_init(void)
3777 {
3778 int rc;
3779
3780 printk(KERN_INFO "%s\n", driver_name);
3781
3782 serial_driver = alloc_tty_driver(MAX_DEVICES);
3783 if (!serial_driver) {
3784 printk("%s can't allocate tty driver\n", driver_name);
3785 return -ENOMEM;
3786 }
3787
3788 /* Initialize the tty_driver structure */
3789
3790 serial_driver->driver_name = slgt_driver_name;
3791 serial_driver->name = tty_dev_prefix;
3792 serial_driver->major = ttymajor;
3793 serial_driver->minor_start = 64;
3794 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
3795 serial_driver->subtype = SERIAL_TYPE_NORMAL;
3796 serial_driver->init_termios = tty_std_termios;
3797 serial_driver->init_termios.c_cflag =
3798 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
3799 serial_driver->init_termios.c_ispeed = 9600;
3800 serial_driver->init_termios.c_ospeed = 9600;
3801 serial_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
3802 tty_set_operations(serial_driver, &ops);
3803 if ((rc = tty_register_driver(serial_driver)) < 0) {
3804 DBGERR(("%s can't register serial driver\n", driver_name));
3805 put_tty_driver(serial_driver);
3806 serial_driver = NULL;
3807 goto error;
3808 }
3809
3810 printk(KERN_INFO "%s, tty major#%d\n",
3811 driver_name, serial_driver->major);
3812
3813 slgt_device_count = 0;
3814 if ((rc = pci_register_driver(&pci_driver)) < 0) {
3815 printk("%s pci_register_driver error=%d\n", driver_name, rc);
3816 goto error;
3817 }
3818 pci_registered = true;
3819
3820 if (!slgt_device_list)
3821 printk("%s no devices found\n",driver_name);
3822
3823 return 0;
3824
3825 error:
3826 slgt_cleanup();
3827 return rc;
3828 }
3829
3830 static void __exit slgt_exit(void)
3831 {
3832 slgt_cleanup();
3833 }
3834
3835 module_init(slgt_init);
3836 module_exit(slgt_exit);
3837
3838 /*
3839 * register access routines
3840 */
3841
3842 #define CALC_REGADDR() \
3843 unsigned long reg_addr = ((unsigned long)info->reg_addr) + addr; \
3844 if (addr >= 0x80) \
3845 reg_addr += (info->port_num) * 32; \
3846 else if (addr >= 0x40) \
3847 reg_addr += (info->port_num) * 16;
3848
3849 static __u8 rd_reg8(struct slgt_info *info, unsigned int addr)
3850 {
3851 CALC_REGADDR();
3852 return readb((void __iomem *)reg_addr);
3853 }
3854
3855 static void wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value)
3856 {
3857 CALC_REGADDR();
3858 writeb(value, (void __iomem *)reg_addr);
3859 }
3860
3861 static __u16 rd_reg16(struct slgt_info *info, unsigned int addr)
3862 {
3863 CALC_REGADDR();
3864 return readw((void __iomem *)reg_addr);
3865 }
3866
3867 static void wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value)
3868 {
3869 CALC_REGADDR();
3870 writew(value, (void __iomem *)reg_addr);
3871 }
3872
3873 static __u32 rd_reg32(struct slgt_info *info, unsigned int addr)
3874 {
3875 CALC_REGADDR();
3876 return readl((void __iomem *)reg_addr);
3877 }
3878
3879 static void wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value)
3880 {
3881 CALC_REGADDR();
3882 writel(value, (void __iomem *)reg_addr);
3883 }
3884
3885 static void rdma_reset(struct slgt_info *info)
3886 {
3887 unsigned int i;
3888
3889 /* set reset bit */
3890 wr_reg32(info, RDCSR, BIT1);
3891
3892 /* wait for enable bit cleared */
3893 for(i=0 ; i < 1000 ; i++)
3894 if (!(rd_reg32(info, RDCSR) & BIT0))
3895 break;
3896 }
3897
3898 static void tdma_reset(struct slgt_info *info)
3899 {
3900 unsigned int i;
3901
3902 /* set reset bit */
3903 wr_reg32(info, TDCSR, BIT1);
3904
3905 /* wait for enable bit cleared */
3906 for(i=0 ; i < 1000 ; i++)
3907 if (!(rd_reg32(info, TDCSR) & BIT0))
3908 break;
3909 }
3910
3911 /*
3912 * enable internal loopback
3913 * TxCLK and RxCLK are generated from BRG
3914 * and TxD is looped back to RxD internally.
3915 */
3916 static void enable_loopback(struct slgt_info *info)
3917 {
3918 /* SCR (serial control) BIT2=loopback enable */
3919 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) | BIT2));
3920
3921 if (info->params.mode != MGSL_MODE_ASYNC) {
3922 /* CCR (clock control)
3923 * 07..05 tx clock source (010 = BRG)
3924 * 04..02 rx clock source (010 = BRG)
3925 * 01 auxclk enable (0 = disable)
3926 * 00 BRG enable (1 = enable)
3927 *
3928 * 0100 1001
3929 */
3930 wr_reg8(info, CCR, 0x49);
3931
3932 /* set speed if available, otherwise use default */
3933 if (info->params.clock_speed)
3934 set_rate(info, info->params.clock_speed);
3935 else
3936 set_rate(info, 3686400);
3937 }
3938 }
3939
3940 /*
3941 * set baud rate generator to specified rate
3942 */
3943 static void set_rate(struct slgt_info *info, u32 rate)
3944 {
3945 unsigned int div;
3946 unsigned int osc = info->base_clock;
3947
3948 /* div = osc/rate - 1
3949 *
3950 * Round div up if osc/rate is not integer to
3951 * force to next slowest rate.
3952 */
3953
3954 if (rate) {
3955 div = osc/rate;
3956 if (!(osc % rate) && div)
3957 div--;
3958 wr_reg16(info, BDR, (unsigned short)div);
3959 }
3960 }
3961
3962 static void rx_stop(struct slgt_info *info)
3963 {
3964 unsigned short val;
3965
3966 /* disable and reset receiver */
3967 val = rd_reg16(info, RCR) & ~BIT1; /* clear enable bit */
3968 wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */
3969 wr_reg16(info, RCR, val); /* clear reset bit */
3970
3971 slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA + IRQ_RXIDLE);
3972
3973 /* clear pending rx interrupts */
3974 wr_reg16(info, SSR, IRQ_RXIDLE + IRQ_RXOVER);
3975
3976 rdma_reset(info);
3977
3978 info->rx_enabled = false;
3979 info->rx_restart = false;
3980 }
3981
3982 static void rx_start(struct slgt_info *info)
3983 {
3984 unsigned short val;
3985
3986 slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA);
3987
3988 /* clear pending rx overrun IRQ */
3989 wr_reg16(info, SSR, IRQ_RXOVER);
3990
3991 /* reset and disable receiver */
3992 val = rd_reg16(info, RCR) & ~BIT1; /* clear enable bit */
3993 wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */
3994 wr_reg16(info, RCR, val); /* clear reset bit */
3995
3996 rdma_reset(info);
3997 reset_rbufs(info);
3998
3999 if (info->rx_pio) {
4000 /* rx request when rx FIFO not empty */
4001 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) & ~BIT14));
4002 slgt_irq_on(info, IRQ_RXDATA);
4003 if (info->params.mode == MGSL_MODE_ASYNC) {
4004 /* enable saving of rx status */
4005 wr_reg32(info, RDCSR, BIT6);
4006 }
4007 } else {
4008 /* rx request when rx FIFO half full */
4009 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) | BIT14));
4010 /* set 1st descriptor address */
4011 wr_reg32(info, RDDAR, info->rbufs[0].pdesc);
4012
4013 if (info->params.mode != MGSL_MODE_ASYNC) {
4014 /* enable rx DMA and DMA interrupt */
4015 wr_reg32(info, RDCSR, (BIT2 + BIT0));
4016 } else {
4017 /* enable saving of rx status, rx DMA and DMA interrupt */
4018 wr_reg32(info, RDCSR, (BIT6 + BIT2 + BIT0));
4019 }
4020 }
4021
4022 slgt_irq_on(info, IRQ_RXOVER);
4023
4024 /* enable receiver */
4025 wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | BIT1));
4026
4027 info->rx_restart = false;
4028 info->rx_enabled = true;
4029 }
4030
4031 static void tx_start(struct slgt_info *info)
4032 {
4033 if (!info->tx_enabled) {
4034 wr_reg16(info, TCR,
4035 (unsigned short)((rd_reg16(info, TCR) | BIT1) & ~BIT2));
4036 info->tx_enabled = true;
4037 }
4038
4039 if (desc_count(info->tbufs[info->tbuf_start])) {
4040 info->drop_rts_on_tx_done = false;
4041
4042 if (info->params.mode != MGSL_MODE_ASYNC) {
4043 if (info->params.flags & HDLC_FLAG_AUTO_RTS) {
4044 get_signals(info);
4045 if (!(info->signals & SerialSignal_RTS)) {
4046 info->signals |= SerialSignal_RTS;
4047 set_signals(info);
4048 info->drop_rts_on_tx_done = true;
4049 }
4050 }
4051
4052 slgt_irq_off(info, IRQ_TXDATA);
4053 slgt_irq_on(info, IRQ_TXUNDER + IRQ_TXIDLE);
4054 /* clear tx idle and underrun status bits */
4055 wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER));
4056 } else {
4057 slgt_irq_off(info, IRQ_TXDATA);
4058 slgt_irq_on(info, IRQ_TXIDLE);
4059 /* clear tx idle status bit */
4060 wr_reg16(info, SSR, IRQ_TXIDLE);
4061 }
4062 /* set 1st descriptor address and start DMA */
4063 wr_reg32(info, TDDAR, info->tbufs[info->tbuf_start].pdesc);
4064 wr_reg32(info, TDCSR, BIT2 + BIT0);
4065 info->tx_active = true;
4066 }
4067 }
4068
4069 static void tx_stop(struct slgt_info *info)
4070 {
4071 unsigned short val;
4072
4073 del_timer(&info->tx_timer);
4074
4075 tdma_reset(info);
4076
4077 /* reset and disable transmitter */
4078 val = rd_reg16(info, TCR) & ~BIT1; /* clear enable bit */
4079 wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
4080
4081 slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
4082
4083 /* clear tx idle and underrun status bit */
4084 wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER));
4085
4086 reset_tbufs(info);
4087
4088 info->tx_enabled = false;
4089 info->tx_active = false;
4090 }
4091
4092 static void reset_port(struct slgt_info *info)
4093 {
4094 if (!info->reg_addr)
4095 return;
4096
4097 tx_stop(info);
4098 rx_stop(info);
4099
4100 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
4101 set_signals(info);
4102
4103 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
4104 }
4105
4106 static void reset_adapter(struct slgt_info *info)
4107 {
4108 int i;
4109 for (i=0; i < info->port_count; ++i) {
4110 if (info->port_array[i])
4111 reset_port(info->port_array[i]);
4112 }
4113 }
4114
4115 static void async_mode(struct slgt_info *info)
4116 {
4117 unsigned short val;
4118
4119 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
4120 tx_stop(info);
4121 rx_stop(info);
4122
4123 /* TCR (tx control)
4124 *
4125 * 15..13 mode, 010=async
4126 * 12..10 encoding, 000=NRZ
4127 * 09 parity enable
4128 * 08 1=odd parity, 0=even parity
4129 * 07 1=RTS driver control
4130 * 06 1=break enable
4131 * 05..04 character length
4132 * 00=5 bits
4133 * 01=6 bits
4134 * 10=7 bits
4135 * 11=8 bits
4136 * 03 0=1 stop bit, 1=2 stop bits
4137 * 02 reset
4138 * 01 enable
4139 * 00 auto-CTS enable
4140 */
4141 val = 0x4000;
4142
4143 if (info->if_mode & MGSL_INTERFACE_RTS_EN)
4144 val |= BIT7;
4145
4146 if (info->params.parity != ASYNC_PARITY_NONE) {
4147 val |= BIT9;
4148 if (info->params.parity == ASYNC_PARITY_ODD)
4149 val |= BIT8;
4150 }
4151
4152 switch (info->params.data_bits)
4153 {
4154 case 6: val |= BIT4; break;
4155 case 7: val |= BIT5; break;
4156 case 8: val |= BIT5 + BIT4; break;
4157 }
4158
4159 if (info->params.stop_bits != 1)
4160 val |= BIT3;
4161
4162 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4163 val |= BIT0;
4164
4165 wr_reg16(info, TCR, val);
4166
4167 /* RCR (rx control)
4168 *
4169 * 15..13 mode, 010=async
4170 * 12..10 encoding, 000=NRZ
4171 * 09 parity enable
4172 * 08 1=odd parity, 0=even parity
4173 * 07..06 reserved, must be 0
4174 * 05..04 character length
4175 * 00=5 bits
4176 * 01=6 bits
4177 * 10=7 bits
4178 * 11=8 bits
4179 * 03 reserved, must be zero
4180 * 02 reset
4181 * 01 enable
4182 * 00 auto-DCD enable
4183 */
4184 val = 0x4000;
4185
4186 if (info->params.parity != ASYNC_PARITY_NONE) {
4187 val |= BIT9;
4188 if (info->params.parity == ASYNC_PARITY_ODD)
4189 val |= BIT8;
4190 }
4191
4192 switch (info->params.data_bits)
4193 {
4194 case 6: val |= BIT4; break;
4195 case 7: val |= BIT5; break;
4196 case 8: val |= BIT5 + BIT4; break;
4197 }
4198
4199 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4200 val |= BIT0;
4201
4202 wr_reg16(info, RCR, val);
4203
4204 /* CCR (clock control)
4205 *
4206 * 07..05 011 = tx clock source is BRG/16
4207 * 04..02 010 = rx clock source is BRG
4208 * 01 0 = auxclk disabled
4209 * 00 1 = BRG enabled
4210 *
4211 * 0110 1001
4212 */
4213 wr_reg8(info, CCR, 0x69);
4214
4215 msc_set_vcr(info);
4216
4217 /* SCR (serial control)
4218 *
4219 * 15 1=tx req on FIFO half empty
4220 * 14 1=rx req on FIFO half full
4221 * 13 tx data IRQ enable
4222 * 12 tx idle IRQ enable
4223 * 11 rx break on IRQ enable
4224 * 10 rx data IRQ enable
4225 * 09 rx break off IRQ enable
4226 * 08 overrun IRQ enable
4227 * 07 DSR IRQ enable
4228 * 06 CTS IRQ enable
4229 * 05 DCD IRQ enable
4230 * 04 RI IRQ enable
4231 * 03 0=16x sampling, 1=8x sampling
4232 * 02 1=txd->rxd internal loopback enable
4233 * 01 reserved, must be zero
4234 * 00 1=master IRQ enable
4235 */
4236 val = BIT15 + BIT14 + BIT0;
4237 /* JCR[8] : 1 = x8 async mode feature available */
4238 if ((rd_reg32(info, JCR) & BIT8) && info->params.data_rate &&
4239 ((info->base_clock < (info->params.data_rate * 16)) ||
4240 (info->base_clock % (info->params.data_rate * 16)))) {
4241 /* use 8x sampling */
4242 val |= BIT3;
4243 set_rate(info, info->params.data_rate * 8);
4244 } else {
4245 /* use 16x sampling */
4246 set_rate(info, info->params.data_rate * 16);
4247 }
4248 wr_reg16(info, SCR, val);
4249
4250 slgt_irq_on(info, IRQ_RXBREAK | IRQ_RXOVER);
4251
4252 if (info->params.loopback)
4253 enable_loopback(info);
4254 }
4255
4256 static void sync_mode(struct slgt_info *info)
4257 {
4258 unsigned short val;
4259
4260 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
4261 tx_stop(info);
4262 rx_stop(info);
4263
4264 /* TCR (tx control)
4265 *
4266 * 15..13 mode
4267 * 000=HDLC/SDLC
4268 * 001=raw bit synchronous
4269 * 010=asynchronous/isochronous
4270 * 011=monosync byte synchronous
4271 * 100=bisync byte synchronous
4272 * 101=xsync byte synchronous
4273 * 12..10 encoding
4274 * 09 CRC enable
4275 * 08 CRC32
4276 * 07 1=RTS driver control
4277 * 06 preamble enable
4278 * 05..04 preamble length
4279 * 03 share open/close flag
4280 * 02 reset
4281 * 01 enable
4282 * 00 auto-CTS enable
4283 */
4284 val = BIT2;
4285
4286 switch(info->params.mode) {
4287 case MGSL_MODE_XSYNC:
4288 val |= BIT15 + BIT13;
4289 break;
4290 case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break;
4291 case MGSL_MODE_BISYNC: val |= BIT15; break;
4292 case MGSL_MODE_RAW: val |= BIT13; break;
4293 }
4294 if (info->if_mode & MGSL_INTERFACE_RTS_EN)
4295 val |= BIT7;
4296
4297 switch(info->params.encoding)
4298 {
4299 case HDLC_ENCODING_NRZB: val |= BIT10; break;
4300 case HDLC_ENCODING_NRZI_MARK: val |= BIT11; break;
4301 case HDLC_ENCODING_NRZI: val |= BIT11 + BIT10; break;
4302 case HDLC_ENCODING_BIPHASE_MARK: val |= BIT12; break;
4303 case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break;
4304 case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break;
4305 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
4306 }
4307
4308 switch (info->params.crc_type & HDLC_CRC_MASK)
4309 {
4310 case HDLC_CRC_16_CCITT: val |= BIT9; break;
4311 case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
4312 }
4313
4314 if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE)
4315 val |= BIT6;
4316
4317 switch (info->params.preamble_length)
4318 {
4319 case HDLC_PREAMBLE_LENGTH_16BITS: val |= BIT5; break;
4320 case HDLC_PREAMBLE_LENGTH_32BITS: val |= BIT4; break;
4321 case HDLC_PREAMBLE_LENGTH_64BITS: val |= BIT5 + BIT4; break;
4322 }
4323
4324 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4325 val |= BIT0;
4326
4327 wr_reg16(info, TCR, val);
4328
4329 /* TPR (transmit preamble) */
4330
4331 switch (info->params.preamble)
4332 {
4333 case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break;
4334 case HDLC_PREAMBLE_PATTERN_ONES: val = 0xff; break;
4335 case HDLC_PREAMBLE_PATTERN_ZEROS: val = 0x00; break;
4336 case HDLC_PREAMBLE_PATTERN_10: val = 0x55; break;
4337 case HDLC_PREAMBLE_PATTERN_01: val = 0xaa; break;
4338 default: val = 0x7e; break;
4339 }
4340 wr_reg8(info, TPR, (unsigned char)val);
4341
4342 /* RCR (rx control)
4343 *
4344 * 15..13 mode
4345 * 000=HDLC/SDLC
4346 * 001=raw bit synchronous
4347 * 010=asynchronous/isochronous
4348 * 011=monosync byte synchronous
4349 * 100=bisync byte synchronous
4350 * 101=xsync byte synchronous
4351 * 12..10 encoding
4352 * 09 CRC enable
4353 * 08 CRC32
4354 * 07..03 reserved, must be 0
4355 * 02 reset
4356 * 01 enable
4357 * 00 auto-DCD enable
4358 */
4359 val = 0;
4360
4361 switch(info->params.mode) {
4362 case MGSL_MODE_XSYNC:
4363 val |= BIT15 + BIT13;
4364 break;
4365 case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break;
4366 case MGSL_MODE_BISYNC: val |= BIT15; break;
4367 case MGSL_MODE_RAW: val |= BIT13; break;
4368 }
4369
4370 switch(info->params.encoding)
4371 {
4372 case HDLC_ENCODING_NRZB: val |= BIT10; break;
4373 case HDLC_ENCODING_NRZI_MARK: val |= BIT11; break;
4374 case HDLC_ENCODING_NRZI: val |= BIT11 + BIT10; break;
4375 case HDLC_ENCODING_BIPHASE_MARK: val |= BIT12; break;
4376 case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break;
4377 case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break;
4378 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
4379 }
4380
4381 switch (info->params.crc_type & HDLC_CRC_MASK)
4382 {
4383 case HDLC_CRC_16_CCITT: val |= BIT9; break;
4384 case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
4385 }
4386
4387 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4388 val |= BIT0;
4389
4390 wr_reg16(info, RCR, val);
4391
4392 /* CCR (clock control)
4393 *
4394 * 07..05 tx clock source
4395 * 04..02 rx clock source
4396 * 01 auxclk enable
4397 * 00 BRG enable
4398 */
4399 val = 0;
4400
4401 if (info->params.flags & HDLC_FLAG_TXC_BRG)
4402 {
4403 // when RxC source is DPLL, BRG generates 16X DPLL
4404 // reference clock, so take TxC from BRG/16 to get
4405 // transmit clock at actual data rate
4406 if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4407 val |= BIT6 + BIT5; /* 011, txclk = BRG/16 */
4408 else
4409 val |= BIT6; /* 010, txclk = BRG */
4410 }
4411 else if (info->params.flags & HDLC_FLAG_TXC_DPLL)
4412 val |= BIT7; /* 100, txclk = DPLL Input */
4413 else if (info->params.flags & HDLC_FLAG_TXC_RXCPIN)
4414 val |= BIT5; /* 001, txclk = RXC Input */
4415
4416 if (info->params.flags & HDLC_FLAG_RXC_BRG)
4417 val |= BIT3; /* 010, rxclk = BRG */
4418 else if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4419 val |= BIT4; /* 100, rxclk = DPLL */
4420 else if (info->params.flags & HDLC_FLAG_RXC_TXCPIN)
4421 val |= BIT2; /* 001, rxclk = TXC Input */
4422
4423 if (info->params.clock_speed)
4424 val |= BIT1 + BIT0;
4425
4426 wr_reg8(info, CCR, (unsigned char)val);
4427
4428 if (info->params.flags & (HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL))
4429 {
4430 // program DPLL mode
4431 switch(info->params.encoding)
4432 {
4433 case HDLC_ENCODING_BIPHASE_MARK:
4434 case HDLC_ENCODING_BIPHASE_SPACE:
4435 val = BIT7; break;
4436 case HDLC_ENCODING_BIPHASE_LEVEL:
4437 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL:
4438 val = BIT7 + BIT6; break;
4439 default: val = BIT6; // NRZ encodings
4440 }
4441 wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | val));
4442
4443 // DPLL requires a 16X reference clock from BRG
4444 set_rate(info, info->params.clock_speed * 16);
4445 }
4446 else
4447 set_rate(info, info->params.clock_speed);
4448
4449 tx_set_idle(info);
4450
4451 msc_set_vcr(info);
4452
4453 /* SCR (serial control)
4454 *
4455 * 15 1=tx req on FIFO half empty
4456 * 14 1=rx req on FIFO half full
4457 * 13 tx data IRQ enable
4458 * 12 tx idle IRQ enable
4459 * 11 underrun IRQ enable
4460 * 10 rx data IRQ enable
4461 * 09 rx idle IRQ enable
4462 * 08 overrun IRQ enable
4463 * 07 DSR IRQ enable
4464 * 06 CTS IRQ enable
4465 * 05 DCD IRQ enable
4466 * 04 RI IRQ enable
4467 * 03 reserved, must be zero
4468 * 02 1=txd->rxd internal loopback enable
4469 * 01 reserved, must be zero
4470 * 00 1=master IRQ enable
4471 */
4472 wr_reg16(info, SCR, BIT15 + BIT14 + BIT0);
4473
4474 if (info->params.loopback)
4475 enable_loopback(info);
4476 }
4477
4478 /*
4479 * set transmit idle mode
4480 */
4481 static void tx_set_idle(struct slgt_info *info)
4482 {
4483 unsigned char val;
4484 unsigned short tcr;
4485
4486 /* if preamble enabled (tcr[6] == 1) then tx idle size = 8 bits
4487 * else tcr[5:4] = tx idle size: 00 = 8 bits, 01 = 16 bits
4488 */
4489 tcr = rd_reg16(info, TCR);
4490 if (info->idle_mode & HDLC_TXIDLE_CUSTOM_16) {
4491 /* disable preamble, set idle size to 16 bits */
4492 tcr = (tcr & ~(BIT6 + BIT5)) | BIT4;
4493 /* MSB of 16 bit idle specified in tx preamble register (TPR) */
4494 wr_reg8(info, TPR, (unsigned char)((info->idle_mode >> 8) & 0xff));
4495 } else if (!(tcr & BIT6)) {
4496 /* preamble is disabled, set idle size to 8 bits */
4497 tcr &= ~(BIT5 + BIT4);
4498 }
4499 wr_reg16(info, TCR, tcr);
4500
4501 if (info->idle_mode & (HDLC_TXIDLE_CUSTOM_8 | HDLC_TXIDLE_CUSTOM_16)) {
4502 /* LSB of custom tx idle specified in tx idle register */
4503 val = (unsigned char)(info->idle_mode & 0xff);
4504 } else {
4505 /* standard 8 bit idle patterns */
4506 switch(info->idle_mode)
4507 {
4508 case HDLC_TXIDLE_FLAGS: val = 0x7e; break;
4509 case HDLC_TXIDLE_ALT_ZEROS_ONES:
4510 case HDLC_TXIDLE_ALT_MARK_SPACE: val = 0xaa; break;
4511 case HDLC_TXIDLE_ZEROS:
4512 case HDLC_TXIDLE_SPACE: val = 0x00; break;
4513 default: val = 0xff;
4514 }
4515 }
4516
4517 wr_reg8(info, TIR, val);
4518 }
4519
4520 /*
4521 * get state of V24 status (input) signals
4522 */
4523 static void get_signals(struct slgt_info *info)
4524 {
4525 unsigned short status = rd_reg16(info, SSR);
4526
4527 /* clear all serial signals except RTS and DTR */
4528 info->signals &= SerialSignal_RTS | SerialSignal_DTR;
4529
4530 if (status & BIT3)
4531 info->signals |= SerialSignal_DSR;
4532 if (status & BIT2)
4533 info->signals |= SerialSignal_CTS;
4534 if (status & BIT1)
4535 info->signals |= SerialSignal_DCD;
4536 if (status & BIT0)
4537 info->signals |= SerialSignal_RI;
4538 }
4539
4540 /*
4541 * set V.24 Control Register based on current configuration
4542 */
4543 static void msc_set_vcr(struct slgt_info *info)
4544 {
4545 unsigned char val = 0;
4546
4547 /* VCR (V.24 control)
4548 *
4549 * 07..04 serial IF select
4550 * 03 DTR
4551 * 02 RTS
4552 * 01 LL
4553 * 00 RL
4554 */
4555
4556 switch(info->if_mode & MGSL_INTERFACE_MASK)
4557 {
4558 case MGSL_INTERFACE_RS232:
4559 val |= BIT5; /* 0010 */
4560 break;
4561 case MGSL_INTERFACE_V35:
4562 val |= BIT7 + BIT6 + BIT5; /* 1110 */
4563 break;
4564 case MGSL_INTERFACE_RS422:
4565 val |= BIT6; /* 0100 */
4566 break;
4567 }
4568
4569 if (info->if_mode & MGSL_INTERFACE_MSB_FIRST)
4570 val |= BIT4;
4571 if (info->signals & SerialSignal_DTR)
4572 val |= BIT3;
4573 if (info->signals & SerialSignal_RTS)
4574 val |= BIT2;
4575 if (info->if_mode & MGSL_INTERFACE_LL)
4576 val |= BIT1;
4577 if (info->if_mode & MGSL_INTERFACE_RL)
4578 val |= BIT0;
4579 wr_reg8(info, VCR, val);
4580 }
4581
4582 /*
4583 * set state of V24 control (output) signals
4584 */
4585 static void set_signals(struct slgt_info *info)
4586 {
4587 unsigned char val = rd_reg8(info, VCR);
4588 if (info->signals & SerialSignal_DTR)
4589 val |= BIT3;
4590 else
4591 val &= ~BIT3;
4592 if (info->signals & SerialSignal_RTS)
4593 val |= BIT2;
4594 else
4595 val &= ~BIT2;
4596 wr_reg8(info, VCR, val);
4597 }
4598
4599 /*
4600 * free range of receive DMA buffers (i to last)
4601 */
4602 static void free_rbufs(struct slgt_info *info, unsigned int i, unsigned int last)
4603 {
4604 int done = 0;
4605
4606 while(!done) {
4607 /* reset current buffer for reuse */
4608 info->rbufs[i].status = 0;
4609 set_desc_count(info->rbufs[i], info->rbuf_fill_level);
4610 if (i == last)
4611 done = 1;
4612 if (++i == info->rbuf_count)
4613 i = 0;
4614 }
4615 info->rbuf_current = i;
4616 }
4617
4618 /*
4619 * mark all receive DMA buffers as free
4620 */
4621 static void reset_rbufs(struct slgt_info *info)
4622 {
4623 free_rbufs(info, 0, info->rbuf_count - 1);
4624 info->rbuf_fill_index = 0;
4625 info->rbuf_fill_count = 0;
4626 }
4627
4628 /*
4629 * pass receive HDLC frame to upper layer
4630 *
4631 * return true if frame available, otherwise false
4632 */
4633 static bool rx_get_frame(struct slgt_info *info)
4634 {
4635 unsigned int start, end;
4636 unsigned short status;
4637 unsigned int framesize = 0;
4638 unsigned long flags;
4639 struct tty_struct *tty = info->port.tty;
4640 unsigned char addr_field = 0xff;
4641 unsigned int crc_size = 0;
4642
4643 switch (info->params.crc_type & HDLC_CRC_MASK) {
4644 case HDLC_CRC_16_CCITT: crc_size = 2; break;
4645 case HDLC_CRC_32_CCITT: crc_size = 4; break;
4646 }
4647
4648 check_again:
4649
4650 framesize = 0;
4651 addr_field = 0xff;
4652 start = end = info->rbuf_current;
4653
4654 for (;;) {
4655 if (!desc_complete(info->rbufs[end]))
4656 goto cleanup;
4657
4658 if (framesize == 0 && info->params.addr_filter != 0xff)
4659 addr_field = info->rbufs[end].buf[0];
4660
4661 framesize += desc_count(info->rbufs[end]);
4662
4663 if (desc_eof(info->rbufs[end]))
4664 break;
4665
4666 if (++end == info->rbuf_count)
4667 end = 0;
4668
4669 if (end == info->rbuf_current) {
4670 if (info->rx_enabled){
4671 spin_lock_irqsave(&info->lock,flags);
4672 rx_start(info);
4673 spin_unlock_irqrestore(&info->lock,flags);
4674 }
4675 goto cleanup;
4676 }
4677 }
4678
4679 /* status
4680 *
4681 * 15 buffer complete
4682 * 14..06 reserved
4683 * 05..04 residue
4684 * 02 eof (end of frame)
4685 * 01 CRC error
4686 * 00 abort
4687 */
4688 status = desc_status(info->rbufs[end]);
4689
4690 /* ignore CRC bit if not using CRC (bit is undefined) */
4691 if ((info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_NONE)
4692 status &= ~BIT1;
4693
4694 if (framesize == 0 ||
4695 (addr_field != 0xff && addr_field != info->params.addr_filter)) {
4696 free_rbufs(info, start, end);
4697 goto check_again;
4698 }
4699
4700 if (framesize < (2 + crc_size) || status & BIT0) {
4701 info->icount.rxshort++;
4702 framesize = 0;
4703 } else if (status & BIT1) {
4704 info->icount.rxcrc++;
4705 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX))
4706 framesize = 0;
4707 }
4708
4709 #if SYNCLINK_GENERIC_HDLC
4710 if (framesize == 0) {
4711 info->netdev->stats.rx_errors++;
4712 info->netdev->stats.rx_frame_errors++;
4713 }
4714 #endif
4715
4716 DBGBH(("%s rx frame status=%04X size=%d\n",
4717 info->device_name, status, framesize));
4718 DBGDATA(info, info->rbufs[start].buf, min_t(int, framesize, info->rbuf_fill_level), "rx");
4719
4720 if (framesize) {
4721 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX)) {
4722 framesize -= crc_size;
4723 crc_size = 0;
4724 }
4725
4726 if (framesize > info->max_frame_size + crc_size)
4727 info->icount.rxlong++;
4728 else {
4729 /* copy dma buffer(s) to contiguous temp buffer */
4730 int copy_count = framesize;
4731 int i = start;
4732 unsigned char *p = info->tmp_rbuf;
4733 info->tmp_rbuf_count = framesize;
4734
4735 info->icount.rxok++;
4736
4737 while(copy_count) {
4738 int partial_count = min_t(int, copy_count, info->rbuf_fill_level);
4739 memcpy(p, info->rbufs[i].buf, partial_count);
4740 p += partial_count;
4741 copy_count -= partial_count;
4742 if (++i == info->rbuf_count)
4743 i = 0;
4744 }
4745
4746 if (info->params.crc_type & HDLC_CRC_RETURN_EX) {
4747 *p = (status & BIT1) ? RX_CRC_ERROR : RX_OK;
4748 framesize++;
4749 }
4750
4751 #if SYNCLINK_GENERIC_HDLC
4752 if (info->netcount)
4753 hdlcdev_rx(info,info->tmp_rbuf, framesize);
4754 else
4755 #endif
4756 ldisc_receive_buf(tty, info->tmp_rbuf, info->flag_buf, framesize);
4757 }
4758 }
4759 free_rbufs(info, start, end);
4760 return true;
4761
4762 cleanup:
4763 return false;
4764 }
4765
4766 /*
4767 * pass receive buffer (RAW synchronous mode) to tty layer
4768 * return true if buffer available, otherwise false
4769 */
4770 static bool rx_get_buf(struct slgt_info *info)
4771 {
4772 unsigned int i = info->rbuf_current;
4773 unsigned int count;
4774
4775 if (!desc_complete(info->rbufs[i]))
4776 return false;
4777 count = desc_count(info->rbufs[i]);
4778 switch(info->params.mode) {
4779 case MGSL_MODE_MONOSYNC:
4780 case MGSL_MODE_BISYNC:
4781 case MGSL_MODE_XSYNC:
4782 /* ignore residue in byte synchronous modes */
4783 if (desc_residue(info->rbufs[i]))
4784 count--;
4785 break;
4786 }
4787 DBGDATA(info, info->rbufs[i].buf, count, "rx");
4788 DBGINFO(("rx_get_buf size=%d\n", count));
4789 if (count)
4790 ldisc_receive_buf(info->port.tty, info->rbufs[i].buf,
4791 info->flag_buf, count);
4792 free_rbufs(info, i, i);
4793 return true;
4794 }
4795
4796 static void reset_tbufs(struct slgt_info *info)
4797 {
4798 unsigned int i;
4799 info->tbuf_current = 0;
4800 for (i=0 ; i < info->tbuf_count ; i++) {
4801 info->tbufs[i].status = 0;
4802 info->tbufs[i].count = 0;
4803 }
4804 }
4805
4806 /*
4807 * return number of free transmit DMA buffers
4808 */
4809 static unsigned int free_tbuf_count(struct slgt_info *info)
4810 {
4811 unsigned int count = 0;
4812 unsigned int i = info->tbuf_current;
4813
4814 do
4815 {
4816 if (desc_count(info->tbufs[i]))
4817 break; /* buffer in use */
4818 ++count;
4819 if (++i == info->tbuf_count)
4820 i=0;
4821 } while (i != info->tbuf_current);
4822
4823 /* if tx DMA active, last zero count buffer is in use */
4824 if (count && (rd_reg32(info, TDCSR) & BIT0))
4825 --count;
4826
4827 return count;
4828 }
4829
4830 /*
4831 * return number of bytes in unsent transmit DMA buffers
4832 * and the serial controller tx FIFO
4833 */
4834 static unsigned int tbuf_bytes(struct slgt_info *info)
4835 {
4836 unsigned int total_count = 0;
4837 unsigned int i = info->tbuf_current;
4838 unsigned int reg_value;
4839 unsigned int count;
4840 unsigned int active_buf_count = 0;
4841
4842 /*
4843 * Add descriptor counts for all tx DMA buffers.
4844 * If count is zero (cleared by DMA controller after read),
4845 * the buffer is complete or is actively being read from.
4846 *
4847 * Record buf_count of last buffer with zero count starting
4848 * from current ring position. buf_count is mirror
4849 * copy of count and is not cleared by serial controller.
4850 * If DMA controller is active, that buffer is actively
4851 * being read so add to total.
4852 */
4853 do {
4854 count = desc_count(info->tbufs[i]);
4855 if (count)
4856 total_count += count;
4857 else if (!total_count)
4858 active_buf_count = info->tbufs[i].buf_count;
4859 if (++i == info->tbuf_count)
4860 i = 0;
4861 } while (i != info->tbuf_current);
4862
4863 /* read tx DMA status register */
4864 reg_value = rd_reg32(info, TDCSR);
4865
4866 /* if tx DMA active, last zero count buffer is in use */
4867 if (reg_value & BIT0)
4868 total_count += active_buf_count;
4869
4870 /* add tx FIFO count = reg_value[15..8] */
4871 total_count += (reg_value >> 8) & 0xff;
4872
4873 /* if transmitter active add one byte for shift register */
4874 if (info->tx_active)
4875 total_count++;
4876
4877 return total_count;
4878 }
4879
4880 /*
4881 * load data into transmit DMA buffer ring and start transmitter if needed
4882 * return true if data accepted, otherwise false (buffers full)
4883 */
4884 static bool tx_load(struct slgt_info *info, const char *buf, unsigned int size)
4885 {
4886 unsigned short count;
4887 unsigned int i;
4888 struct slgt_desc *d;
4889
4890 /* check required buffer space */
4891 if (DIV_ROUND_UP(size, DMABUFSIZE) > free_tbuf_count(info))
4892 return false;
4893
4894 DBGDATA(info, buf, size, "tx");
4895
4896 /*
4897 * copy data to one or more DMA buffers in circular ring
4898 * tbuf_start = first buffer for this data
4899 * tbuf_current = next free buffer
4900 *
4901 * Copy all data before making data visible to DMA controller by
4902 * setting descriptor count of the first buffer.
4903 * This prevents an active DMA controller from reading the first DMA
4904 * buffers of a frame and stopping before the final buffers are filled.
4905 */
4906
4907 info->tbuf_start = i = info->tbuf_current;
4908
4909 while (size) {
4910 d = &info->tbufs[i];
4911
4912 count = (unsigned short)((size > DMABUFSIZE) ? DMABUFSIZE : size);
4913 memcpy(d->buf, buf, count);
4914
4915 size -= count;
4916 buf += count;
4917
4918 /*
4919 * set EOF bit for last buffer of HDLC frame or
4920 * for every buffer in raw mode
4921 */
4922 if ((!size && info->params.mode == MGSL_MODE_HDLC) ||
4923 info->params.mode == MGSL_MODE_RAW)
4924 set_desc_eof(*d, 1);
4925 else
4926 set_desc_eof(*d, 0);
4927
4928 /* set descriptor count for all but first buffer */
4929 if (i != info->tbuf_start)
4930 set_desc_count(*d, count);
4931 d->buf_count = count;
4932
4933 if (++i == info->tbuf_count)
4934 i = 0;
4935 }
4936
4937 info->tbuf_current = i;
4938
4939 /* set first buffer count to make new data visible to DMA controller */
4940 d = &info->tbufs[info->tbuf_start];
4941 set_desc_count(*d, d->buf_count);
4942
4943 /* start transmitter if needed and update transmit timeout */
4944 if (!info->tx_active)
4945 tx_start(info);
4946 update_tx_timer(info);
4947
4948 return true;
4949 }
4950
4951 static int register_test(struct slgt_info *info)
4952 {
4953 static unsigned short patterns[] =
4954 {0x0000, 0xffff, 0xaaaa, 0x5555, 0x6969, 0x9696};
4955 static unsigned int count = ARRAY_SIZE(patterns);
4956 unsigned int i;
4957 int rc = 0;
4958
4959 for (i=0 ; i < count ; i++) {
4960 wr_reg16(info, TIR, patterns[i]);
4961 wr_reg16(info, BDR, patterns[(i+1)%count]);
4962 if ((rd_reg16(info, TIR) != patterns[i]) ||
4963 (rd_reg16(info, BDR) != patterns[(i+1)%count])) {
4964 rc = -ENODEV;
4965 break;
4966 }
4967 }
4968 info->gpio_present = (rd_reg32(info, JCR) & BIT5) ? 1 : 0;
4969 info->init_error = rc ? 0 : DiagStatus_AddressFailure;
4970 return rc;
4971 }
4972
4973 static int irq_test(struct slgt_info *info)
4974 {
4975 unsigned long timeout;
4976 unsigned long flags;
4977 struct tty_struct *oldtty = info->port.tty;
4978 u32 speed = info->params.data_rate;
4979
4980 info->params.data_rate = 921600;
4981 info->port.tty = NULL;
4982
4983 spin_lock_irqsave(&info->lock, flags);
4984 async_mode(info);
4985 slgt_irq_on(info, IRQ_TXIDLE);
4986
4987 /* enable transmitter */
4988 wr_reg16(info, TCR,
4989 (unsigned short)(rd_reg16(info, TCR) | BIT1));
4990
4991 /* write one byte and wait for tx idle */
4992 wr_reg16(info, TDR, 0);
4993
4994 /* assume failure */
4995 info->init_error = DiagStatus_IrqFailure;
4996 info->irq_occurred = false;
4997
4998 spin_unlock_irqrestore(&info->lock, flags);
4999
5000 timeout=100;
5001 while(timeout-- && !info->irq_occurred)
5002 msleep_interruptible(10);
5003
5004 spin_lock_irqsave(&info->lock,flags);
5005 reset_port(info);
5006 spin_unlock_irqrestore(&info->lock,flags);
5007
5008 info->params.data_rate = speed;
5009 info->port.tty = oldtty;
5010
5011 info->init_error = info->irq_occurred ? 0 : DiagStatus_IrqFailure;
5012 return info->irq_occurred ? 0 : -ENODEV;
5013 }
5014
5015 static int loopback_test_rx(struct slgt_info *info)
5016 {
5017 unsigned char *src, *dest;
5018 int count;
5019
5020 if (desc_complete(info->rbufs[0])) {
5021 count = desc_count(info->rbufs[0]);
5022 src = info->rbufs[0].buf;
5023 dest = info->tmp_rbuf;
5024
5025 for( ; count ; count-=2, src+=2) {
5026 /* src=data byte (src+1)=status byte */
5027 if (!(*(src+1) & (BIT9 + BIT8))) {
5028 *dest = *src;
5029 dest++;
5030 info->tmp_rbuf_count++;
5031 }
5032 }
5033 DBGDATA(info, info->tmp_rbuf, info->tmp_rbuf_count, "rx");
5034 return 1;
5035 }
5036 return 0;
5037 }
5038
5039 static int loopback_test(struct slgt_info *info)
5040 {
5041 #define TESTFRAMESIZE 20
5042
5043 unsigned long timeout;
5044 u16 count = TESTFRAMESIZE;
5045 unsigned char buf[TESTFRAMESIZE];
5046 int rc = -ENODEV;
5047 unsigned long flags;
5048
5049 struct tty_struct *oldtty = info->port.tty;
5050 MGSL_PARAMS params;
5051
5052 memcpy(&params, &info->params, sizeof(params));
5053
5054 info->params.mode = MGSL_MODE_ASYNC;
5055 info->params.data_rate = 921600;
5056 info->params.loopback = 1;
5057 info->port.tty = NULL;
5058
5059 /* build and send transmit frame */
5060 for (count = 0; count < TESTFRAMESIZE; ++count)
5061 buf[count] = (unsigned char)count;
5062
5063 info->tmp_rbuf_count = 0;
5064 memset(info->tmp_rbuf, 0, TESTFRAMESIZE);
5065
5066 /* program hardware for HDLC and enabled receiver */
5067 spin_lock_irqsave(&info->lock,flags);
5068 async_mode(info);
5069 rx_start(info);
5070 tx_load(info, buf, count);
5071 spin_unlock_irqrestore(&info->lock, flags);
5072
5073 /* wait for receive complete */
5074 for (timeout = 100; timeout; --timeout) {
5075 msleep_interruptible(10);
5076 if (loopback_test_rx(info)) {
5077 rc = 0;
5078 break;
5079 }
5080 }
5081
5082 /* verify received frame length and contents */
5083 if (!rc && (info->tmp_rbuf_count != count ||
5084 memcmp(buf, info->tmp_rbuf, count))) {
5085 rc = -ENODEV;
5086 }
5087
5088 spin_lock_irqsave(&info->lock,flags);
5089 reset_adapter(info);
5090 spin_unlock_irqrestore(&info->lock,flags);
5091
5092 memcpy(&info->params, &params, sizeof(info->params));
5093 info->port.tty = oldtty;
5094
5095 info->init_error = rc ? DiagStatus_DmaFailure : 0;
5096 return rc;
5097 }
5098
5099 static int adapter_test(struct slgt_info *info)
5100 {
5101 DBGINFO(("testing %s\n", info->device_name));
5102 if (register_test(info) < 0) {
5103 printk("register test failure %s addr=%08X\n",
5104 info->device_name, info->phys_reg_addr);
5105 } else if (irq_test(info) < 0) {
5106 printk("IRQ test failure %s IRQ=%d\n",
5107 info->device_name, info->irq_level);
5108 } else if (loopback_test(info) < 0) {
5109 printk("loopback test failure %s\n", info->device_name);
5110 }
5111 return info->init_error;
5112 }
5113
5114 /*
5115 * transmit timeout handler
5116 */
5117 static void tx_timeout(unsigned long context)
5118 {
5119 struct slgt_info *info = (struct slgt_info*)context;
5120 unsigned long flags;
5121
5122 DBGINFO(("%s tx_timeout\n", info->device_name));
5123 if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) {
5124 info->icount.txtimeout++;
5125 }
5126 spin_lock_irqsave(&info->lock,flags);
5127 tx_stop(info);
5128 spin_unlock_irqrestore(&info->lock,flags);
5129
5130 #if SYNCLINK_GENERIC_HDLC
5131 if (info->netcount)
5132 hdlcdev_tx_done(info);
5133 else
5134 #endif
5135 bh_transmit(info);
5136 }
5137
5138 /*
5139 * receive buffer polling timer
5140 */
5141 static void rx_timeout(unsigned long context)
5142 {
5143 struct slgt_info *info = (struct slgt_info*)context;
5144 unsigned long flags;
5145
5146 DBGINFO(("%s rx_timeout\n", info->device_name));
5147 spin_lock_irqsave(&info->lock, flags);
5148 info->pending_bh |= BH_RECEIVE;
5149 spin_unlock_irqrestore(&info->lock, flags);
5150 bh_handler(&info->task);
5151 }
5152
Linux with added FPC-III support