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[linux-2.6-block.git] / drivers / net / wan / pc300_tty.c
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1da177e4
LT		 1/*
2 * pc300_tty.c Cyclades-PC300(tm) TTY Driver.
3 *
4 * Author: Regina Kodato <reginak@cyclades.com>
5 *
6 * Copyright: (c) 1999-2002 Cyclades Corp.
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
12 *
13 * $Log: pc300_tty.c,v $
14 * Revision 3.7 2002/03/07 14:17:09 henrique
15 * License data fixed
16 *
17 * Revision 3.6 2001/12/10 12:29:42 regina
18 * Fix the MLPPP bug
19 *
20 * Revision 3.5 2001/10/31 11:20:05 regina
21 * automatic pppd starts
22 *
23 * Revision 3.4 2001/08/06 12:01:51 regina
24 * problem in DSR_DE bit
25 *
26 * Revision 3.3 2001/07/26 22:58:41 regina
27 * update EDA value
28 *
29 * Revision 3.2 2001/07/12 13:11:20 regina
30 * bug fix - DCD-OFF in pc300 tty driver
31 *
32 * DMA transmission bug fix
33 *
34 * Revision 3.1 2001/06/22 13:13:02 regina
35 * MLPPP implementation
36 *
37 */
38
39#include <linux/module.h>
40#include <linux/kernel.h>
1da177e4
LT		 41#include <linux/errno.h>
42#include <linux/string.h>
43#include <linux/init.h>
44#include <linux/netdevice.h>
45#include <linux/spinlock.h>
46#include <linux/slab.h>
47#include <linux/if.h>
48#include <linux/skbuff.h>
49/* TTY includes */
50#include <linux/tty.h>
51#include <linux/tty_flip.h>
52#include <linux/serial.h>
53
54#include <asm/io.h>
55#include <asm/uaccess.h>
56
57#include "pc300.h"
58
59/* defines and macros */
60/* TTY Global definitions */
61#define CPC_TTY_NPORTS 8 /* maximum number of the sync tty connections */
62#define CPC_TTY_MAJOR CYCLADES_MAJOR
63#define CPC_TTY_MINOR_START 240 /* minor of the first PC300 interface */
64
65#define CPC_TTY_MAX_MTU 2000
66
67/* tty interface state */
68#define CPC_TTY_ST_IDLE 0
69#define CPC_TTY_ST_INIT 1 /* configured with MLPPP and up */
70#define CPC_TTY_ST_OPEN 2 /* opened by application */
71
72#define CPC_TTY_LOCK(card,flags)\
73 do {\
74 spin_lock_irqsave(&card->card_lock, flags); \
75 } while (0)
76
77#define CPC_TTY_UNLOCK(card,flags) \
78 do {\
79 spin_unlock_irqrestore(&card->card_lock, flags); \
80 } while (0)
81
82//#define CPC_TTY_DBG(format,a...) printk(format,##a)
83#define CPC_TTY_DBG(format,a...)
84
85/* data structures */
86typedef struct _st_cpc_rx_buf {
87 struct _st_cpc_rx_buf *next;
88 int size;
89 unsigned char data[1];
90} st_cpc_rx_buf;
91
92struct st_cpc_rx_list {
93 st_cpc_rx_buf *first;
94 st_cpc_rx_buf *last;
95};
96
97typedef struct _st_cpc_tty_area {
98 int state; /* state of the TTY interface */
99 int num_open;
100 unsigned int tty_minor; /* minor this interface */
101 volatile struct st_cpc_rx_list buf_rx; /* ptr. to reception buffer */
102 unsigned char* buf_tx; /* ptr. to transmission buffer */
103 pc300dev_t* pc300dev; /* ptr. to info struct in PC300 driver */
104 unsigned char name[20]; /* interf. name + "-tty" */
105 struct tty_struct *tty;
106 struct work_struct tty_tx_work; /* tx work - tx interrupt */
107 struct work_struct tty_rx_work; /* rx work - rx interrupt */
108 } st_cpc_tty_area;
109
110/* TTY data structures */
111static struct tty_driver serial_drv;
112
113/* local variables */
7665a089 114static st_cpc_tty_area cpc_tty_area[CPC_TTY_NPORTS];
1da177e4 115
7665a089
AB		 116static int cpc_tty_cnt = 0; /* number of intrfaces configured with MLPPP */
117static int cpc_tty_unreg_flag = 0;
1da177e4
LT		 118
119/* TTY functions prototype */
120static int cpc_tty_open(struct tty_struct *tty, struct file *flip);
121static void cpc_tty_close(struct tty_struct *tty, struct file *flip);
122static int cpc_tty_write(struct tty_struct *tty, const unsigned char *buf, int count);
123static int cpc_tty_write_room(struct tty_struct *tty);
124static int cpc_tty_chars_in_buffer(struct tty_struct *tty);
125static void cpc_tty_flush_buffer(struct tty_struct *tty);
126static void cpc_tty_hangup(struct tty_struct *tty);
c4028958
DH		 127static void cpc_tty_rx_work(struct work_struct *work);
128static void cpc_tty_tx_work(struct work_struct *work);
1da177e4
LT		 129static int cpc_tty_send_to_card(pc300dev_t *dev,void *buf, int len);
130static void cpc_tty_trace(pc300dev_t *dev, char* buf, int len, char rxtx);
131static void cpc_tty_signal_off(pc300dev_t *pc300dev, unsigned char);
132static void cpc_tty_signal_on(pc300dev_t *pc300dev, unsigned char);
133
7665a089
AB		 134static int pc300_tiocmset(struct tty_struct *, struct file *,
135 unsigned int, unsigned int);
136static int pc300_tiocmget(struct tty_struct *, struct file *);
1da177e4
LT		 137
138/* functions called by PC300 driver */
139void cpc_tty_init(pc300dev_t *dev);
140void cpc_tty_unregister_service(pc300dev_t *pc300dev);
141void cpc_tty_receive(pc300dev_t *pc300dev);
142void cpc_tty_trigger_poll(pc300dev_t *pc300dev);
143void cpc_tty_reset_var(void);
144
145/*
146 * PC300 TTY clear "signal"
147 */
148static void cpc_tty_signal_off(pc300dev_t *pc300dev, unsigned char signal)
149{
150 pc300ch_t *pc300chan = (pc300ch_t *)pc300dev->chan;
151 pc300_t *card = (pc300_t *) pc300chan->card;
152 int ch = pc300chan->channel;
153 unsigned long flags;
154
155 CPC_TTY_DBG("%s-tty: Clear signal %x\n",
156 pc300dev->dev->name, signal);
157 CPC_TTY_LOCK(card, flags);
158 cpc_writeb(card->hw.scabase + M_REG(CTL,ch),
159 cpc_readb(card->hw.scabase+M_REG(CTL,ch))& signal);
160 CPC_TTY_UNLOCK(card,flags);
161}
162
163/*
164 * PC300 TTY set "signal" to ON
165 */
166static void cpc_tty_signal_on(pc300dev_t *pc300dev, unsigned char signal)
167{
168 pc300ch_t *pc300chan = (pc300ch_t *)pc300dev->chan;
169 pc300_t *card = (pc300_t *) pc300chan->card;
170 int ch = pc300chan->channel;
171 unsigned long flags;
172
173 CPC_TTY_DBG("%s-tty: Set signal %x\n",
174 pc300dev->dev->name, signal);
175 CPC_TTY_LOCK(card, flags);
176 cpc_writeb(card->hw.scabase + M_REG(CTL,ch),
177 cpc_readb(card->hw.scabase+M_REG(CTL,ch))& ~signal);
178 CPC_TTY_UNLOCK(card,flags);
179}
180
56dbbb9a
AC		 181
182static const struct tty_operations pc300_ops = {
183 .open = cpc_tty_open,
184 .close = cpc_tty_close,
185 .write = cpc_tty_write,
186 .write_room = cpc_tty_write_room,
187 .chars_in_buffer = cpc_tty_chars_in_buffer,
188 .tiocmset = pc300_tiocmset,
189 .tiocmget = pc300_tiocmget,
190 .flush_buffer = cpc_tty_flush_buffer,
191 .hangup = cpc_tty_hangup,
192};
193
194
1da177e4
LT		 195/*
196 * PC300 TTY initialization routine
197 *
198 * This routine is called by the PC300 driver during board configuration
199 * (ioctl=SIOCSP300CONF). At this point the adapter is completely
200 * initialized.
201 * o verify kernel version (only 2.4.x)
202 * o register TTY driver
203 * o init cpc_tty_area struct
204 */
205void cpc_tty_init(pc300dev_t *pc300dev)
206{
207 unsigned long port;
208 int aux;
209 st_cpc_tty_area * cpc_tty;
210
211 /* hdlcX - X=interface number */
212 port = pc300dev->dev->name[4] - '0';
213 if (port >= CPC_TTY_NPORTS) {
214 printk("%s-tty: invalid interface selected (0-%i): %li",
215 pc300dev->dev->name,
216 CPC_TTY_NPORTS-1,port);
217 return;
218 }
219
220 if (cpc_tty_cnt == 0) { /* first TTY connection -> register driver */
221 CPC_TTY_DBG("%s-tty: driver init, major:%i, minor range:%i=%i\n",
222 pc300dev->dev->name,
223 CPC_TTY_MAJOR, CPC_TTY_MINOR_START,
224 CPC_TTY_MINOR_START+CPC_TTY_NPORTS);
225 /* initialize tty driver struct */
226 memset(&serial_drv,0,sizeof(struct tty_driver));
227 serial_drv.magic = TTY_DRIVER_MAGIC;
228 serial_drv.owner = THIS_MODULE;
229 serial_drv.driver_name = "pc300_tty";
230 serial_drv.name = "ttyCP";
231 serial_drv.major = CPC_TTY_MAJOR;
232 serial_drv.minor_start = CPC_TTY_MINOR_START;
233 serial_drv.num = CPC_TTY_NPORTS;
234 serial_drv.type = TTY_DRIVER_TYPE_SERIAL;
235 serial_drv.subtype = SERIAL_TYPE_NORMAL;
236
237 serial_drv.init_termios = tty_std_termios;
238 serial_drv.init_termios.c_cflag = B9600|CS8|CREAD|HUPCL|CLOCAL;
239 serial_drv.flags = TTY_DRIVER_REAL_RAW;
240
241 /* interface routines from the upper tty layer to the tty driver */
56dbbb9a 242 tty_set_operations(&serial_drv, &pc300_ops);
1da177e4
LT		 243
244 /* register the TTY driver */
245 if (tty_register_driver(&serial_drv)) {
246 printk("%s-tty: Failed to register serial driver! ",
247 pc300dev->dev->name);
248 return;
249 }
250
251 memset((void *)cpc_tty_area, 0,
252 sizeof(st_cpc_tty_area) * CPC_TTY_NPORTS);
253 }
254
255 cpc_tty = &cpc_tty_area[port];
256
257 if (cpc_tty->state != CPC_TTY_ST_IDLE) {
258 CPC_TTY_DBG("%s-tty: TTY port %i, already in use.\n",
259 pc300dev->dev->name, port);
260 return;
261 }
262
263 cpc_tty_cnt++;
264 cpc_tty->state = CPC_TTY_ST_INIT;
265 cpc_tty->num_open= 0;
266 cpc_tty->tty_minor = port + CPC_TTY_MINOR_START;
267 cpc_tty->pc300dev = pc300dev;
268
c4028958
DH		 269 INIT_WORK(&cpc_tty->tty_tx_work, cpc_tty_tx_work);
270 INIT_WORK(&cpc_tty->tty_rx_work, cpc_tty_rx_work);
1da177e4
LT		 271
272 cpc_tty->buf_rx.first = cpc_tty->buf_rx.last = NULL;
273
274 pc300dev->cpc_tty = (void *)cpc_tty;
275
276 aux = strlen(pc300dev->dev->name);
277 memcpy(cpc_tty->name, pc300dev->dev->name, aux);
278 memcpy(&cpc_tty->name[aux], "-tty", 5);
279
280 cpc_open(pc300dev->dev);
281 cpc_tty_signal_off(pc300dev, CTL_DTR);
282
283 CPC_TTY_DBG("%s: Initializing TTY Sync Driver, tty major#%d minor#%i\n",
284 cpc_tty->name,CPC_TTY_MAJOR,cpc_tty->tty_minor);
285 return;
286}
287
288/*
289 * PC300 TTY OPEN routine
290 *
291 * This routine is called by the tty driver to open the interface
292 * o verify minor
293 * o allocate buffer to Rx and Tx
294 */
295static int cpc_tty_open(struct tty_struct *tty, struct file *flip)
296{
297 int port ;
298 st_cpc_tty_area *cpc_tty;
299
300 if (!tty) {
301 return -ENODEV;
302 }
303
304 port = tty->index;
305
306 if ((port < 0) || (port >= CPC_TTY_NPORTS)){
307 CPC_TTY_DBG("pc300_tty: open invalid port %d\n", port);
308 return -ENODEV;
309 }
310
311 cpc_tty = &cpc_tty_area[port];
312
313 if (cpc_tty->state == CPC_TTY_ST_IDLE){
314 CPC_TTY_DBG("%s: open - invalid interface, port=%d\n",
315 cpc_tty->name, tty->index);
316 return -ENODEV;
317 }
318
319 if (cpc_tty->num_open == 0) { /* first open of this tty */
320 if (!cpc_tty_area[port].buf_tx){
321 cpc_tty_area[port].buf_tx = kmalloc(CPC_TTY_MAX_MTU,GFP_KERNEL);
79ea13ce 322 if (!cpc_tty_area[port].buf_tx) {
1da177e4
LT		 323 CPC_TTY_DBG("%s: error in memory allocation\n",cpc_tty->name);
324 return -ENOMEM;
325 }
326 }
327
328 if (cpc_tty_area[port].buf_rx.first) {
329 unsigned char * aux;
330 while (cpc_tty_area[port].buf_rx.first) {
331 aux = (unsigned char *)cpc_tty_area[port].buf_rx.first;
332 cpc_tty_area[port].buf_rx.first = cpc_tty_area[port].buf_rx.first->next;
333 kfree(aux);
334 }
335 cpc_tty_area[port].buf_rx.first = NULL;
336 cpc_tty_area[port].buf_rx.last = NULL;
337 }
338
339 cpc_tty_area[port].state = CPC_TTY_ST_OPEN;
340 cpc_tty_area[port].tty = tty;
341 tty->driver_data = &cpc_tty_area[port];
342
343 cpc_tty_signal_on(cpc_tty->pc300dev, CTL_DTR);
344 }
345
346 cpc_tty->num_open++;
347
348 CPC_TTY_DBG("%s: opening TTY driver\n", cpc_tty->name);
349
350 /* avisar driver PC300 */
351 return 0;
352}
353
354/*
355 * PC300 TTY CLOSE routine
356 *
357 * This routine is called by the tty driver to close the interface
358 * o call close channel in PC300 driver (cpc_closech)
359 * o free Rx and Tx buffers
360 */
361
362static void cpc_tty_close(struct tty_struct *tty, struct file *flip)
363{
364 st_cpc_tty_area *cpc_tty;
365 unsigned long flags;
366 int res;
367
368 if (!tty || !tty->driver_data ) {
369 CPC_TTY_DBG("hdlx-tty: no TTY in close \n");
370 return;
371 }
372
373 cpc_tty = (st_cpc_tty_area *) tty->driver_data;
374
375 if ((cpc_tty->tty != tty)|| (cpc_tty->state != CPC_TTY_ST_OPEN)) {
376 CPC_TTY_DBG("%s: TTY is not opened\n",cpc_tty->name);
377 return;
378 }
379
380 if (!cpc_tty->num_open) {
381 CPC_TTY_DBG("%s: TTY is closed\n",cpc_tty->name);
382 return;
383 }
384
385 if (--cpc_tty->num_open > 0) {
386 CPC_TTY_DBG("%s: TTY closed\n",cpc_tty->name);
387 return;
388 }
389
390 cpc_tty_signal_off(cpc_tty->pc300dev, CTL_DTR);
391
392 CPC_TTY_LOCK(cpc_tty->pc300dev->chan->card, flags); /* lock irq */
393 cpc_tty->tty = NULL;
394 cpc_tty->state = CPC_TTY_ST_INIT;
395 CPC_TTY_UNLOCK(cpc_tty->pc300dev->chan->card, flags); /* unlock irq */
396
397 if (cpc_tty->buf_rx.first) {
398 unsigned char * aux;
399 while (cpc_tty->buf_rx.first) {
400 aux = (unsigned char *)cpc_tty->buf_rx.first;
401 cpc_tty->buf_rx.first = cpc_tty->buf_rx.first->next;
402 kfree(aux);
403 }
404 cpc_tty->buf_rx.first = NULL;
405 cpc_tty->buf_rx.last = NULL;
406 }
407
6a5d3621
JJ		 408 kfree(cpc_tty->buf_tx);
409 cpc_tty->buf_tx = NULL;
1da177e4
LT		 410
411 CPC_TTY_DBG("%s: TTY closed\n",cpc_tty->name);
412
413 if (!serial_drv.refcount && cpc_tty_unreg_flag) {
414 cpc_tty_unreg_flag = 0;
415 CPC_TTY_DBG("%s: unregister the tty driver\n", cpc_tty->name);
416 if ((res=tty_unregister_driver(&serial_drv))) {
417 CPC_TTY_DBG("%s: ERROR ->unregister the tty driver error=%d\n",
418 cpc_tty->name,res);
419 }
420 }
421 return;
422}
423
424/*
425 * PC300 TTY WRITE routine
426 *
427 * This routine is called by the tty driver to write a series of characters
428 * to the tty device. The characters may come from user or kernel space.
429 * o verify the DCD signal
430 * o send characters to board and start the transmission
431 */
432static int cpc_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
433{
434 st_cpc_tty_area *cpc_tty;
435 pc300ch_t *pc300chan;
436 pc300_t *card;
437 int ch;
438 unsigned long flags;
439 struct net_device_stats *stats;
440
441 if (!tty || !tty->driver_data ) {
442 CPC_TTY_DBG("hdlcX-tty: no TTY in write\n");
443 return -ENODEV;
444 }
445
446 cpc_tty = (st_cpc_tty_area *) tty->driver_data;
447
448 if ((cpc_tty->tty != tty) || (cpc_tty->state != CPC_TTY_ST_OPEN)) {
449 CPC_TTY_DBG("%s: TTY is not opened\n", cpc_tty->name);
450 return -ENODEV;
451 }
452
453 if (count > CPC_TTY_MAX_MTU) {
454 CPC_TTY_DBG("%s: count is invalid\n",cpc_tty->name);
455 return -EINVAL; /* frame too big */
456 }
457
458 CPC_TTY_DBG("%s: cpc_tty_write data len=%i\n",cpc_tty->name,count);
459
460 pc300chan = (pc300ch_t *)((pc300dev_t*)cpc_tty->pc300dev)->chan;
461 stats = hdlc_stats(((pc300dev_t*)cpc_tty->pc300dev)->dev);
462 card = (pc300_t *) pc300chan->card;
463 ch = pc300chan->channel;
464
465 /* verify DCD signal*/
466 if (cpc_readb(card->hw.scabase + M_REG(ST3,ch)) & ST3_DCD) {
467 /* DCD is OFF */
468 CPC_TTY_DBG("%s : DCD is OFF\n", cpc_tty->name);
469 stats->tx_errors++;
470 stats->tx_carrier_errors++;
471 CPC_TTY_LOCK(card, flags);
472 cpc_writeb(card->hw.scabase + M_REG(CMD, ch), CMD_TX_BUF_CLR);
473
474 if (card->hw.type == PC300_TE) {
475 cpc_writeb(card->hw.falcbase + card->hw.cpld_reg2,
476 cpc_readb(card->hw.falcbase + card->hw.cpld_reg2) &
477 ~(CPLD_REG2_FALC_LED1 << (2 *ch)));
478 }
479
480 CPC_TTY_UNLOCK(card, flags);
481
482 return -EINVAL;
483 }
484
485 if (cpc_tty_send_to_card(cpc_tty->pc300dev, (void*)buf, count)) {
486 /* failed to send */
487 CPC_TTY_DBG("%s: trasmition error\n", cpc_tty->name);
488 return 0;
489 }
490 return count;
491}
492
493/*
494 * PC300 TTY Write Room routine
495 *
496 * This routine returns the numbers of characteres the tty driver will accept
497 * for queuing to be written.
498 * o return MTU
499 */
500static int cpc_tty_write_room(struct tty_struct *tty)
501{
502 st_cpc_tty_area *cpc_tty;
503
504 if (!tty || !tty->driver_data ) {
505 CPC_TTY_DBG("hdlcX-tty: no TTY to write room\n");
506 return -ENODEV;
507 }
508
509 cpc_tty = (st_cpc_tty_area *) tty->driver_data;
510
511 if ((cpc_tty->tty != tty) || (cpc_tty->state != CPC_TTY_ST_OPEN)) {
512 CPC_TTY_DBG("%s: TTY is not opened\n",cpc_tty->name);
513 return -ENODEV;
514 }
515
516 CPC_TTY_DBG("%s: write room\n",cpc_tty->name);
517
518 return CPC_TTY_MAX_MTU;
519}
520
521/*
522 * PC300 TTY chars in buffer routine
523 *
524 * This routine returns the chars number in the transmission buffer
525 * o returns 0
526 */
527static int cpc_tty_chars_in_buffer(struct tty_struct *tty)
528{
529 st_cpc_tty_area *cpc_tty;
530
531 if (!tty || !tty->driver_data ) {
532 CPC_TTY_DBG("hdlcX-tty: no TTY to chars in buffer\n");
533 return -ENODEV;
534 }
535
536 cpc_tty = (st_cpc_tty_area *) tty->driver_data;
537
538 if ((cpc_tty->tty != tty) || (cpc_tty->state != CPC_TTY_ST_OPEN)) {
539 CPC_TTY_DBG("%s: TTY is not opened\n",cpc_tty->name);
540 return -ENODEV;
541 }
542
543 return(0);
544}
545
7665a089
AB		 546static int pc300_tiocmset(struct tty_struct *tty, struct file *file,
547 unsigned int set, unsigned int clear)
1da177e4
LT		 548{
549 st_cpc_tty_area *cpc_tty;
550
551 CPC_TTY_DBG("%s: set:%x clear:%x\n", __FUNCTION__, set, clear);
552
553 if (!tty || !tty->driver_data ) {
554 CPC_TTY_DBG("hdlcX-tty: no TTY to chars in buffer\n");
555 return -ENODEV;
556 }
557
558 cpc_tty = (st_cpc_tty_area *) tty->driver_data;
559
560 if (set & TIOCM_RTS)
561 cpc_tty_signal_on(cpc_tty->pc300dev, CTL_RTS);
562 if (set & TIOCM_DTR)
563 cpc_tty_signal_on(cpc_tty->pc300dev, CTL_DTR);
564
565 if (clear & TIOCM_RTS)
566 cpc_tty_signal_off(cpc_tty->pc300dev, CTL_RTS);
567 if (clear & TIOCM_DTR)
568 cpc_tty_signal_off(cpc_tty->pc300dev, CTL_DTR);
569
570 return 0;
571}
572
7665a089 573static int pc300_tiocmget(struct tty_struct *tty, struct file *file)
1da177e4
LT		 574{
575 unsigned int result;
576 unsigned char status;
577 unsigned long flags;
578 st_cpc_tty_area *cpc_tty = (st_cpc_tty_area *) tty->driver_data;
579 pc300dev_t *pc300dev = cpc_tty->pc300dev;
580 pc300ch_t *pc300chan = (pc300ch_t *)pc300dev->chan;
581 pc300_t *card = (pc300_t *) pc300chan->card;
582 int ch = pc300chan->channel;
583
584 cpc_tty = (st_cpc_tty_area *) tty->driver_data;
585
586 CPC_TTY_DBG("%s-tty: tiocmget\n",
587 ((struct net_device*)(pc300dev->hdlc))->name);
588
589 CPC_TTY_LOCK(card, flags);
590 status = cpc_readb(card->hw.scabase+M_REG(CTL,ch));
591 CPC_TTY_UNLOCK(card,flags);
592
593 result = ((status & CTL_DTR) ? TIOCM_DTR : 0) |
594 ((status & CTL_RTS) ? TIOCM_RTS : 0);
595
596 return result;
597}
598
599/*
600 * PC300 TTY Flush Buffer routine
601 *
602 * This routine resets the transmission buffer
603 */
604static void cpc_tty_flush_buffer(struct tty_struct *tty)
605{
606 st_cpc_tty_area *cpc_tty;
607
608 if (!tty || !tty->driver_data ) {
609 CPC_TTY_DBG("hdlcX-tty: no TTY to flush buffer\n");
610 return;
611 }
612
613 cpc_tty = (st_cpc_tty_area *) tty->driver_data;
614
615 if ((cpc_tty->tty != tty) || (cpc_tty->state != CPC_TTY_ST_OPEN)) {
616 CPC_TTY_DBG("%s: TTY is not opened\n",cpc_tty->name);
617 return;
618 }
619
620 CPC_TTY_DBG("%s: call wake_up_interruptible\n",cpc_tty->name);
621
622 tty_wakeup(tty);
623 return;
624}
625
626/*
627 * PC300 TTY Hangup routine
628 *
629 * This routine is called by the tty driver to hangup the interface
630 * o clear DTR signal
631 */
632
633static void cpc_tty_hangup(struct tty_struct *tty)
634{
635 st_cpc_tty_area *cpc_tty;
636 int res;
637
638 if (!tty || !tty->driver_data ) {
639 CPC_TTY_DBG("hdlcX-tty: no TTY to hangup\n");
640 return ;
641 }
642
643 cpc_tty = (st_cpc_tty_area *) tty->driver_data;
644
645 if ((cpc_tty->tty != tty) || (cpc_tty->state != CPC_TTY_ST_OPEN)) {
646 CPC_TTY_DBG("%s: TTY is not opened\n",cpc_tty->name);
647 return ;
648 }
649 if (!serial_drv.refcount && cpc_tty_unreg_flag) {
650 cpc_tty_unreg_flag = 0;
651 CPC_TTY_DBG("%s: unregister the tty driver\n", cpc_tty->name);
652 if ((res=tty_unregister_driver(&serial_drv))) {
653 CPC_TTY_DBG("%s: ERROR ->unregister the tty driver error=%d\n",
654 cpc_tty->name,res);
655 }
656 }
657 cpc_tty_signal_off(cpc_tty->pc300dev, CTL_DTR);
658}
659
660/*
661 * PC300 TTY RX work routine
662 * This routine treats RX work
663 * o verify read buffer
664 * o call the line disc. read
665 * o free memory
666 */
c4028958 667static void cpc_tty_rx_work(struct work_struct *work)
1da177e4 668{
c4028958 669 st_cpc_tty_area *cpc_tty;
1da177e4
LT		 670 unsigned long port;
671 int i, j;
6a5d3621 672 volatile st_cpc_rx_buf *buf;
1da177e4
LT		 673 char flags=0,flg_rx=1;
674 struct tty_ldisc *ld;
675
676 if (cpc_tty_cnt == 0) return;
1da177e4
LT		 677
678 for (i=0; (i < 4) && flg_rx ; i++) {
679 flg_rx = 0;
c4028958
DH		 680
681 cpc_tty = container_of(work, st_cpc_tty_area, tty_rx_work);
682 port = cpc_tty - cpc_tty_area;
683
1da177e4
LT		 684 for (j=0; j < CPC_TTY_NPORTS; j++) {
685 cpc_tty = &cpc_tty_area[port];
686
79ea13ce 687 if ((buf=cpc_tty->buf_rx.first) != NULL) {
6a5d3621 688 if (cpc_tty->tty) {
1da177e4 689 ld = tty_ldisc_ref(cpc_tty->tty);
6a5d3621 690 if (ld) {
a352def2 691 if (ld->ops->receive_buf) {
1da177e4 692 CPC_TTY_DBG("%s: call line disc. receive_buf\n",cpc_tty->name);
a352def2 693 ld->ops->receive_buf(cpc_tty->tty, (char *)(buf->data), &flags, buf->size);
1da177e4
LT		 694 }
695 tty_ldisc_deref(ld);
696 }
697 }
698 cpc_tty->buf_rx.first = cpc_tty->buf_rx.first->next;
33f0f88f 699 kfree((void *)buf);
1da177e4
LT		 700 buf = cpc_tty->buf_rx.first;
701 flg_rx = 1;
702 }
703 if (++port == CPC_TTY_NPORTS) port = 0;
704 }
705 }
706}
707
708/*
709 * PC300 TTY RX work routine
710 *
711 * This routine treats RX interrupt.
712 * o read all frames in card
713 * o verify the frame size
714 * o read the frame in rx buffer
715 */
716static void cpc_tty_rx_disc_frame(pc300ch_t *pc300chan)
717{
718 volatile pcsca_bd_t __iomem * ptdescr;
719 volatile unsigned char status;
720 pc300_t *card = (pc300_t *)pc300chan->card;
721 int ch = pc300chan->channel;
722
723 /* dma buf read */
724 ptdescr = (pcsca_bd_t __iomem *)(card->hw.rambase +
725 RX_BD_ADDR(ch, pc300chan->rx_first_bd));
726 while (pc300chan->rx_first_bd != pc300chan->rx_last_bd) {
727 status = cpc_readb(&ptdescr->status);
728 cpc_writeb(&ptdescr->status, 0);
729 cpc_writeb(&ptdescr->len, 0);
730 pc300chan->rx_first_bd = (pc300chan->rx_first_bd + 1) &
731 (N_DMA_RX_BUF - 1);
732 if (status & DST_EOM) {
733 break; /* end of message */
734 }
735 ptdescr = (pcsca_bd_t __iomem *)(card->hw.rambase + cpc_readl(&ptdescr->next));
736 }
737}
738
739void cpc_tty_receive(pc300dev_t *pc300dev)
740{
6a5d3621 741 st_cpc_tty_area *cpc_tty;
1da177e4
LT		 742 pc300ch_t *pc300chan = (pc300ch_t *)pc300dev->chan;
743 pc300_t *card = (pc300_t *)pc300chan->card;
744 int ch = pc300chan->channel;
745 volatile pcsca_bd_t __iomem * ptdescr;
746 struct net_device_stats *stats = hdlc_stats(pc300dev->dev);
747 int rx_len, rx_aux;
748 volatile unsigned char status;
749 unsigned short first_bd = pc300chan->rx_first_bd;
6a5d3621 750 st_cpc_rx_buf *new = NULL;
1da177e4
LT		 751 unsigned char dsr_rx;
752
753 if (pc300dev->cpc_tty == NULL) {
754 return;
755 }
756
757 dsr_rx = cpc_readb(card->hw.scabase + DSR_RX(ch));
758
759 cpc_tty = (st_cpc_tty_area *)pc300dev->cpc_tty;
760
761 while (1) {
762 rx_len = 0;
763 ptdescr = (pcsca_bd_t __iomem *)(card->hw.rambase + RX_BD_ADDR(ch, first_bd));
764 while ((status = cpc_readb(&ptdescr->status)) & DST_OSB) {
765 rx_len += cpc_readw(&ptdescr->len);
766 first_bd = (first_bd + 1) & (N_DMA_RX_BUF - 1);
767 if (status & DST_EOM) {
768 break;
769 }
6a5d3621 770 ptdescr = (pcsca_bd_t __iomem *)(card->hw.rambase+cpc_readl(&ptdescr->next));
1da177e4
LT		 771 }
772
773 if (!rx_len) {
774 if (dsr_rx & DSR_BOF) {
775 /* update EDA */
776 cpc_writel(card->hw.scabase + DRX_REG(EDAL, ch),
777 RX_BD_ADDR(ch, pc300chan->rx_last_bd));
778 }
6a5d3621 779 kfree(new);
1da177e4
LT		 780 return;
781 }
782
783 if (rx_len > CPC_TTY_MAX_MTU) {
784 /* Free RX descriptors */
785 CPC_TTY_DBG("%s: frame size is invalid.\n",cpc_tty->name);
786 stats->rx_errors++;
787 stats->rx_frame_errors++;
788 cpc_tty_rx_disc_frame(pc300chan);
789 continue;
790 }
791
5cbded58 792 new = kmalloc(rx_len + sizeof(st_cpc_rx_buf), GFP_ATOMIC);
79ea13ce 793 if (!new) {
1da177e4
LT		 794 cpc_tty_rx_disc_frame(pc300chan);
795 continue;
796 }
797
798 /* dma buf read */
799 ptdescr = (pcsca_bd_t __iomem *)(card->hw.rambase +
800 RX_BD_ADDR(ch, pc300chan->rx_first_bd));
801
802 rx_len = 0; /* counter frame size */
803
804 while ((status = cpc_readb(&ptdescr->status)) & DST_OSB) {
805 rx_aux = cpc_readw(&ptdescr->len);
806 if ((status & (DST_OVR | DST_CRC | DST_RBIT | DST_SHRT | DST_ABT))
807 || (rx_aux > BD_DEF_LEN)) {
808 CPC_TTY_DBG("%s: reception error\n", cpc_tty->name);
809 stats->rx_errors++;
810 if (status & DST_OVR) {
811 stats->rx_fifo_errors++;
812 }
813 if (status & DST_CRC) {
814 stats->rx_crc_errors++;
815 }
816 if ((status & (DST_RBIT | DST_SHRT | DST_ABT)) ||
817 (rx_aux > BD_DEF_LEN)) {
818 stats->rx_frame_errors++;
819 }
820 /* discard remainig descriptors used by the bad frame */
821 CPC_TTY_DBG("%s: reception error - discard descriptors",
822 cpc_tty->name);
823 cpc_tty_rx_disc_frame(pc300chan);
824 rx_len = 0;
825 kfree(new);
826 new = NULL;
827 break; /* read next frame - while(1) */
828 }
829
830 if (cpc_tty->state != CPC_TTY_ST_OPEN) {
831 /* Free RX descriptors */
832 cpc_tty_rx_disc_frame(pc300chan);
833 stats->rx_dropped++;
834 rx_len = 0;
835 kfree(new);
836 new = NULL;
837 break; /* read next frame - while(1) */
838 }
839
840 /* read the segment of the frame */
841 if (rx_aux != 0) {
842 memcpy_fromio((new->data + rx_len),
843 (void __iomem *)(card->hw.rambase +
844 cpc_readl(&ptdescr->ptbuf)), rx_aux);
845 rx_len += rx_aux;
846 }
847 cpc_writeb(&ptdescr->status,0);
848 cpc_writeb(&ptdescr->len, 0);
849 pc300chan->rx_first_bd = (pc300chan->rx_first_bd + 1) &
850 (N_DMA_RX_BUF -1);
851 if (status & DST_EOM)break;
852
853 ptdescr = (pcsca_bd_t __iomem *) (card->hw.rambase +
854 cpc_readl(&ptdescr->next));
855 }
856 /* update pointer */
857 pc300chan->rx_last_bd = (pc300chan->rx_first_bd - 1) &
858 (N_DMA_RX_BUF - 1) ;
859 if (!(dsr_rx & DSR_BOF)) {
860 /* update EDA */
861 cpc_writel(card->hw.scabase + DRX_REG(EDAL, ch),
862 RX_BD_ADDR(ch, pc300chan->rx_last_bd));
863 }
864 if (rx_len != 0) {
865 stats->rx_bytes += rx_len;
866
867 if (pc300dev->trace_on) {
868 cpc_tty_trace(pc300dev, new->data,rx_len, 'R');
869 }
870 new->size = rx_len;
871 new->next = NULL;
79ea13ce 872 if (cpc_tty->buf_rx.first == NULL) {
1da177e4
LT		 873 cpc_tty->buf_rx.first = new;
874 cpc_tty->buf_rx.last = new;
875 } else {
876 cpc_tty->buf_rx.last->next = new;
877 cpc_tty->buf_rx.last = new;
878 }
879 schedule_work(&(cpc_tty->tty_rx_work));
880 stats->rx_packets++;
881 }
882 }
883}
884
885/*
886 * PC300 TTY TX work routine
887 *
888 * This routine treats TX interrupt.
889 * o if need call line discipline wakeup
890 * o call wake_up_interruptible
891 */
c4028958 892static void cpc_tty_tx_work(struct work_struct *work)
1da177e4 893{
c4028958
DH		 894 st_cpc_tty_area *cpc_tty =
895 container_of(work, st_cpc_tty_area, tty_tx_work);
1da177e4
LT		 896 struct tty_struct *tty;
897
898 CPC_TTY_DBG("%s: cpc_tty_tx_work init\n",cpc_tty->name);
899
79ea13ce 900 if ((tty = cpc_tty->tty) == NULL) {
1da177e4
LT		 901 CPC_TTY_DBG("%s: the interface is not opened\n",cpc_tty->name);
902 return;
903 }
904 tty_wakeup(tty);
905}
906
907/*
908 * PC300 TTY send to card routine
909 *
910 * This routine send data to card.
911 * o clear descriptors
912 * o write data to DMA buffers
913 * o start the transmission
914 */
915static int cpc_tty_send_to_card(pc300dev_t *dev,void* buf, int len)
916{
917 pc300ch_t *chan = (pc300ch_t *)dev->chan;
918 pc300_t *card = (pc300_t *)chan->card;
919 int ch = chan->channel;
920 struct net_device_stats *stats = hdlc_stats(dev->dev);
921 unsigned long flags;
922 volatile pcsca_bd_t __iomem *ptdescr;
923 int i, nchar;
924 int tosend = len;
925 int nbuf = ((len - 1)/BD_DEF_LEN) + 1;
926 unsigned char *pdata=buf;
927
928 CPC_TTY_DBG("%s:cpc_tty_send_to_cars len=%i",
929 (st_cpc_tty_area *)dev->cpc_tty->name,len);
930
931 if (nbuf >= card->chan[ch].nfree_tx_bd) {
932 return 1;
933 }
934
935 /* write buffer to DMA buffers */
936 CPC_TTY_DBG("%s: call dma_buf_write\n",
937 (st_cpc_tty_area *)dev->cpc_tty->name);
938 for (i = 0 ; i < nbuf ; i++) {
939 ptdescr = (pcsca_bd_t __iomem *)(card->hw.rambase +
940 TX_BD_ADDR(ch, card->chan[ch].tx_next_bd));
941 nchar = (BD_DEF_LEN > tosend) ? tosend : BD_DEF_LEN;
942 if (cpc_readb(&ptdescr->status) & DST_OSB) {
943 memcpy_toio((void __iomem *)(card->hw.rambase +
944 cpc_readl(&ptdescr->ptbuf)),
945 &pdata[len - tosend],
946 nchar);
947 card->chan[ch].nfree_tx_bd--;
948 if ((i + 1) == nbuf) {
949 /* This must be the last BD to be used */
950 cpc_writeb(&ptdescr->status, DST_EOM);
951 } else {
952 cpc_writeb(&ptdescr->status, 0);
953 }
954 cpc_writew(&ptdescr->len, nchar);
955 } else {
956 CPC_TTY_DBG("%s: error in dma_buf_write\n",
957 (st_cpc_tty_area *)dev->cpc_tty->name);
958 stats->tx_dropped++;
959 return 1;
960 }
961 tosend -= nchar;
962 card->chan[ch].tx_next_bd =
963 (card->chan[ch].tx_next_bd + 1) & (N_DMA_TX_BUF - 1);
964 }
965
966 if (dev->trace_on) {
967 cpc_tty_trace(dev, buf, len,'T');
968 }
969
970 /* start transmission */
971 CPC_TTY_DBG("%s: start transmission\n",
972 (st_cpc_tty_area *)dev->cpc_tty->name);
973
974 CPC_TTY_LOCK(card, flags);
975 cpc_writeb(card->hw.scabase + DTX_REG(EDAL, ch),
976 TX_BD_ADDR(ch, chan->tx_next_bd));
977 cpc_writeb(card->hw.scabase + M_REG(CMD, ch), CMD_TX_ENA);
978 cpc_writeb(card->hw.scabase + DSR_TX(ch), DSR_DE);
979
980 if (card->hw.type == PC300_TE) {
981 cpc_writeb(card->hw.falcbase + card->hw.cpld_reg2,
982 cpc_readb(card->hw.falcbase + card->hw.cpld_reg2) |
983 (CPLD_REG2_FALC_LED1 << (2 * ch)));
984 }
985 CPC_TTY_UNLOCK(card, flags);
986 return 0;
987}
988
989/*
990 * PC300 TTY trace routine
991 *
992 * This routine send trace of connection to application.
993 * o clear descriptors
994 * o write data to DMA buffers
995 * o start the transmission
996 */
997
998static void cpc_tty_trace(pc300dev_t *dev, char* buf, int len, char rxtx)
999{
1000 struct sk_buff *skb;
1001
1002 if ((skb = dev_alloc_skb(10 + len)) == NULL) {
1003 /* out of memory */
1004 CPC_TTY_DBG("%s: tty_trace - out of memory\n", dev->dev->name);
1005 return;
1006 }
1007
1008 skb_put (skb, 10 + len);
1009 skb->dev = dev->dev;
1010 skb->protocol = htons(ETH_P_CUST);
459a98ed 1011 skb_reset_mac_header(skb);
1da177e4
LT		 1012 skb->pkt_type = PACKET_HOST;
1013 skb->len = 10 + len;
1014
27d7ff46 1015 skb_copy_to_linear_data(skb, dev->dev->name, 5);
1da177e4
LT		 1016 skb->data[5] = '[';
1017 skb->data[6] = rxtx;
1018 skb->data[7] = ']';
1019 skb->data[8] = ':';
1020 skb->data[9] = ' ';
27d7ff46 1021 skb_copy_to_linear_data_offset(skb, 10, buf, len);
1da177e4
LT		 1022 netif_rx(skb);
1023}
1024
1025/*
1026 * PC300 TTY unregister service routine
1027 *
1028 * This routine unregister one interface.
1029 */
1030void cpc_tty_unregister_service(pc300dev_t *pc300dev)
1031{
1032 st_cpc_tty_area *cpc_tty;
1033 ulong flags;
1034 int res;
1035
79ea13ce 1036 if ((cpc_tty= (st_cpc_tty_area *) pc300dev->cpc_tty) == NULL) {
1da177e4
LT		 1037 CPC_TTY_DBG("%s: interface is not TTY\n", pc300dev->dev->name);
1038 return;
1039 }
1040 CPC_TTY_DBG("%s: cpc_tty_unregister_service", cpc_tty->name);
1041
1042 if (cpc_tty->pc300dev != pc300dev) {
1043 CPC_TTY_DBG("%s: invalid tty ptr=%s\n",
1044 pc300dev->dev->name, cpc_tty->name);
1045 return;
1046 }
1047
1048 if (--cpc_tty_cnt == 0) {
1049 if (serial_drv.refcount) {
1050 CPC_TTY_DBG("%s: unregister is not possible, refcount=%d",
1051 cpc_tty->name, serial_drv.refcount);
1052 cpc_tty_cnt++;
1053 cpc_tty_unreg_flag = 1;
1054 return;
1055 } else {
1056 CPC_TTY_DBG("%s: unregister the tty driver\n", cpc_tty->name);
1057 if ((res=tty_unregister_driver(&serial_drv))) {
1058 CPC_TTY_DBG("%s: ERROR ->unregister the tty driver error=%d\n",
1059 cpc_tty->name,res);
1060 }
1061 }
1062 }
1063 CPC_TTY_LOCK(pc300dev->chan->card,flags);
1064 cpc_tty->tty = NULL;
1065 CPC_TTY_UNLOCK(pc300dev->chan->card, flags);
1066 cpc_tty->tty_minor = 0;
1067 cpc_tty->state = CPC_TTY_ST_IDLE;
1068}
1069
1070/*
1071 * PC300 TTY trigger poll routine
1072 * This routine is called by pc300driver to treats Tx interrupt.
1073 */
1074void cpc_tty_trigger_poll(pc300dev_t *pc300dev)
1075{
1076 st_cpc_tty_area *cpc_tty = (st_cpc_tty_area *)pc300dev->cpc_tty;
1077 if (!cpc_tty) {
1078 return;
1079 }
1080 schedule_work(&(cpc_tty->tty_tx_work));
1081}
1082
1083/*
1084 * PC300 TTY reset var routine
1085 * This routine is called by pc300driver to init the TTY area.
1086 */
1087
1088void cpc_tty_reset_var(void)
1089{
1090 int i ;
1091
1092 CPC_TTY_DBG("hdlcX-tty: reset variables\n");
1093 /* reset the tty_driver structure - serial_drv */
1094 memset(&serial_drv, 0, sizeof(struct tty_driver));
1095 for (i=0; i < CPC_TTY_NPORTS; i++){
1096 memset(&cpc_tty_area[i],0, sizeof(st_cpc_tty_area));
1097 }
1098}
Linux 6.x block layer and io_uring tree(s)