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tty_ioctl: locking for tty_wait_until_sent
[deliverable/linux.git] / drivers / char / isicom.c
1 /*
2 * This program is free software; you can redistribute it and/or
3 * modify it under the terms of the GNU General Public License
4 * as published by the Free Software Foundation; either version
5 * 2 of the License, or (at your option) any later version.
6 *
7 * Original driver code supplied by Multi-Tech
8 *
9 * Changes
10 * 1/9/98 alan@redhat.com Merge to 2.0.x kernel tree
11 * Obtain and use official major/minors
12 * Loader switched to a misc device
13 * (fixed range check bug as a side effect)
14 * Printk clean up
15 * 9/12/98 alan@redhat.com Rough port to 2.1.x
16 *
17 * 10/6/99 sameer Merged the ISA and PCI drivers to
18 * a new unified driver.
19 *
20 * 3/9/99 sameer Added support for ISI4616 cards.
21 *
22 * 16/9/99 sameer We do not force RTS low anymore.
23 * This is to prevent the firmware
24 * from getting confused.
25 *
26 * 26/10/99 sameer Cosmetic changes:The driver now
27 * dumps the Port Count information
28 * along with I/O address and IRQ.
29 *
30 * 13/12/99 sameer Fixed the problem with IRQ sharing.
31 *
32 * 10/5/00 sameer Fixed isicom_shutdown_board()
33 * to not lower DTR on all the ports
34 * when the last port on the card is
35 * closed.
36 *
37 * 10/5/00 sameer Signal mask setup command added
38 * to isicom_setup_port and
39 * isicom_shutdown_port.
40 *
41 * 24/5/00 sameer The driver is now SMP aware.
42 *
43 *
44 * 27/11/00 Vinayak P Risbud Fixed the Driver Crash Problem
45 *
46 *
47 * 03/01/01 anil .s Added support for resetting the
48 * internal modems on ISI cards.
49 *
50 * 08/02/01 anil .s Upgraded the driver for kernel
51 * 2.4.x
52 *
53 * 11/04/01 Kevin Fixed firmware load problem with
54 * ISIHP-4X card
55 *
56 * 30/04/01 anil .s Fixed the remote login through
57 * ISI port problem. Now the link
58 * does not go down before password
59 * prompt.
60 *
61 * 03/05/01 anil .s Fixed the problem with IRQ sharing
62 * among ISI-PCI cards.
63 *
64 * 03/05/01 anil .s Added support to display the version
65 * info during insmod as well as module
66 * listing by lsmod.
67 *
68 * 10/05/01 anil .s Done the modifications to the source
69 * file and Install script so that the
70 * same installation can be used for
71 * 2.2.x and 2.4.x kernel.
72 *
73 * 06/06/01 anil .s Now we drop both dtr and rts during
74 * shutdown_port as well as raise them
75 * during isicom_config_port.
76 *
77 * 09/06/01 acme@conectiva.com.br use capable, not suser, do
78 * restore_flags on failure in
79 * isicom_send_break, verify put_user
80 * result
81 *
82 * 11/02/03 ranjeeth Added support for 230 Kbps and 460 Kbps
83 * Baud index extended to 21
84 *
85 * 20/03/03 ranjeeth Made to work for Linux Advanced server.
86 * Taken care of license warning.
87 *
88 * 10/12/03 Ravindra Made to work for Fedora Core 1 of
89 * Red Hat Distribution
90 *
91 * 06/01/05 Alan Cox Merged the ISI and base kernel strands
92 * into a single 2.6 driver
93 *
94 * ***********************************************************
95 *
96 * To use this driver you also need the support package. You
97 * can find this in RPM format on
98 * ftp://ftp.linux.org.uk/pub/linux/alan
99 *
100 * You can find the original tools for this direct from Multitech
101 * ftp://ftp.multitech.com/ISI-Cards/
102 *
103 * Having installed the cards the module options (/etc/modprobe.conf)
104 *
105 * options isicom io=card1,card2,card3,card4 irq=card1,card2,card3,card4
106 *
107 * Omit those entries for boards you don't have installed.
108 *
109 * TODO
110 * Merge testing
111 * 64-bit verification
112 */
113
114 #include <linux/module.h>
115 #include <linux/firmware.h>
116 #include <linux/kernel.h>
117 #include <linux/tty.h>
118 #include <linux/tty_flip.h>
119 #include <linux/termios.h>
120 #include <linux/fs.h>
121 #include <linux/sched.h>
122 #include <linux/serial.h>
123 #include <linux/mm.h>
124 #include <linux/interrupt.h>
125 #include <linux/timer.h>
126 #include <linux/delay.h>
127 #include <linux/ioport.h>
128
129 #include <asm/uaccess.h>
130 #include <asm/io.h>
131 #include <asm/system.h>
132
133 #include <linux/pci.h>
134
135 #include <linux/isicom.h>
136
137 #define InterruptTheCard(base) outw(0, (base) + 0xc)
138 #define ClearInterrupt(base) inw((base) + 0x0a)
139
140 #define pr_dbg(str...) pr_debug("ISICOM: " str)
141 #ifdef DEBUG
142 #define isicom_paranoia_check(a, b, c) __isicom_paranoia_check((a), (b), (c))
143 #else
144 #define isicom_paranoia_check(a, b, c) 0
145 #endif
146
147 static int isicom_probe(struct pci_dev *, const struct pci_device_id *);
148 static void __devexit isicom_remove(struct pci_dev *);
149
150 static struct pci_device_id isicom_pci_tbl[] = {
151 { PCI_DEVICE(VENDOR_ID, 0x2028) },
152 { PCI_DEVICE(VENDOR_ID, 0x2051) },
153 { PCI_DEVICE(VENDOR_ID, 0x2052) },
154 { PCI_DEVICE(VENDOR_ID, 0x2053) },
155 { PCI_DEVICE(VENDOR_ID, 0x2054) },
156 { PCI_DEVICE(VENDOR_ID, 0x2055) },
157 { PCI_DEVICE(VENDOR_ID, 0x2056) },
158 { PCI_DEVICE(VENDOR_ID, 0x2057) },
159 { PCI_DEVICE(VENDOR_ID, 0x2058) },
160 { 0 }
161 };
162 MODULE_DEVICE_TABLE(pci, isicom_pci_tbl);
163
164 static struct pci_driver isicom_driver = {
165 .name = "isicom",
166 .id_table = isicom_pci_tbl,
167 .probe = isicom_probe,
168 .remove = __devexit_p(isicom_remove)
169 };
170
171 static int prev_card = 3; /* start servicing isi_card[0] */
172 static struct tty_driver *isicom_normal;
173
174 static void isicom_tx(unsigned long _data);
175 static void isicom_start(struct tty_struct *tty);
176
177 static DEFINE_TIMER(tx, isicom_tx, 0, 0);
178
179 /* baud index mappings from linux defns to isi */
180
181 static signed char linuxb_to_isib[] = {
182 -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 13, 15, 16, 17, 18, 19, 20, 21
183 };
184
185 struct isi_board {
186 unsigned long base;
187 int irq;
188 unsigned char port_count;
189 unsigned short status;
190 unsigned short port_status; /* each bit for each port */
191 unsigned short shift_count;
192 struct isi_port * ports;
193 signed char count;
194 spinlock_t card_lock; /* Card wide lock 11/5/00 -sameer */
195 unsigned long flags;
196 unsigned int index;
197 };
198
199 struct isi_port {
200 unsigned short magic;
201 unsigned int flags;
202 int count;
203 int blocked_open;
204 int close_delay;
205 u16 channel;
206 u16 status;
207 u16 closing_wait;
208 struct isi_board * card;
209 struct tty_struct * tty;
210 wait_queue_head_t close_wait;
211 wait_queue_head_t open_wait;
212 unsigned char * xmit_buf;
213 int xmit_head;
214 int xmit_tail;
215 int xmit_cnt;
216 };
217
218 static struct isi_board isi_card[BOARD_COUNT];
219 static struct isi_port isi_ports[PORT_COUNT];
220
221 /*
222 * Locking functions for card level locking. We need to own both
223 * the kernel lock for the card and have the card in a position that
224 * it wants to talk.
225 */
226
227 static inline int WaitTillCardIsFree(unsigned long base)
228 {
229 unsigned int count = 0;
230 unsigned int a = in_atomic(); /* do we run under spinlock? */
231
232 while (!(inw(base + 0xe) & 0x1) && count++ < 100)
233 if (a)
234 mdelay(1);
235 else
236 msleep(1);
237
238 return !(inw(base + 0xe) & 0x1);
239 }
240
241 static int lock_card(struct isi_board *card)
242 {
243 unsigned long base = card->base;
244 unsigned int retries, a;
245
246 for (retries = 0; retries < 10; retries++) {
247 spin_lock_irqsave(&card->card_lock, card->flags);
248 for (a = 0; a < 10; a++) {
249 if (inw(base + 0xe) & 0x1)
250 return 1;
251 udelay(10);
252 }
253 spin_unlock_irqrestore(&card->card_lock, card->flags);
254 msleep(10);
255 }
256 printk(KERN_WARNING "ISICOM: Failed to lock Card (0x%lx)\n",
257 card->base);
258
259 return 0; /* Failed to acquire the card! */
260 }
261
262 static void unlock_card(struct isi_board *card)
263 {
264 spin_unlock_irqrestore(&card->card_lock, card->flags);
265 }
266
267 /*
268 * ISI Card specific ops ...
269 */
270
271 /* card->lock HAS to be held */
272 static void raise_dtr(struct isi_port *port)
273 {
274 struct isi_board *card = port->card;
275 unsigned long base = card->base;
276 u16 channel = port->channel;
277
278 if (WaitTillCardIsFree(base))
279 return;
280
281 outw(0x8000 | (channel << card->shift_count) | 0x02, base);
282 outw(0x0504, base);
283 InterruptTheCard(base);
284 port->status |= ISI_DTR;
285 }
286
287 /* card->lock HAS to be held */
288 static inline void drop_dtr(struct isi_port *port)
289 {
290 struct isi_board *card = port->card;
291 unsigned long base = card->base;
292 u16 channel = port->channel;
293
294 if (WaitTillCardIsFree(base))
295 return;
296
297 outw(0x8000 | (channel << card->shift_count) | 0x02, base);
298 outw(0x0404, base);
299 InterruptTheCard(base);
300 port->status &= ~ISI_DTR;
301 }
302
303 /* card->lock HAS to be held */
304 static inline void raise_rts(struct isi_port *port)
305 {
306 struct isi_board *card = port->card;
307 unsigned long base = card->base;
308 u16 channel = port->channel;
309
310 if (WaitTillCardIsFree(base))
311 return;
312
313 outw(0x8000 | (channel << card->shift_count) | 0x02, base);
314 outw(0x0a04, base);
315 InterruptTheCard(base);
316 port->status |= ISI_RTS;
317 }
318
319 /* card->lock HAS to be held */
320 static inline void drop_rts(struct isi_port *port)
321 {
322 struct isi_board *card = port->card;
323 unsigned long base = card->base;
324 u16 channel = port->channel;
325
326 if (WaitTillCardIsFree(base))
327 return;
328
329 outw(0x8000 | (channel << card->shift_count) | 0x02, base);
330 outw(0x0804, base);
331 InterruptTheCard(base);
332 port->status &= ~ISI_RTS;
333 }
334
335 /* card->lock MUST NOT be held */
336 static inline void raise_dtr_rts(struct isi_port *port)
337 {
338 struct isi_board *card = port->card;
339 unsigned long base = card->base;
340 u16 channel = port->channel;
341
342 if (!lock_card(card))
343 return;
344
345 outw(0x8000 | (channel << card->shift_count) | 0x02, base);
346 outw(0x0f04, base);
347 InterruptTheCard(base);
348 port->status |= (ISI_DTR | ISI_RTS);
349 unlock_card(card);
350 }
351
352 /* card->lock HAS to be held */
353 static void drop_dtr_rts(struct isi_port *port)
354 {
355 struct isi_board *card = port->card;
356 unsigned long base = card->base;
357 u16 channel = port->channel;
358
359 if (WaitTillCardIsFree(base))
360 return;
361
362 outw(0x8000 | (channel << card->shift_count) | 0x02, base);
363 outw(0x0c04, base);
364 InterruptTheCard(base);
365 port->status &= ~(ISI_RTS | ISI_DTR);
366 }
367
368 /*
369 * ISICOM Driver specific routines ...
370 *
371 */
372
373 static inline int __isicom_paranoia_check(struct isi_port const *port,
374 char *name, const char *routine)
375 {
376 if (!port) {
377 printk(KERN_WARNING "ISICOM: Warning: bad isicom magic for "
378 "dev %s in %s.\n", name, routine);
379 return 1;
380 }
381 if (port->magic != ISICOM_MAGIC) {
382 printk(KERN_WARNING "ISICOM: Warning: NULL isicom port for "
383 "dev %s in %s.\n", name, routine);
384 return 1;
385 }
386
387 return 0;
388 }
389
390 /*
391 * Transmitter.
392 *
393 * We shovel data into the card buffers on a regular basis. The card
394 * will do the rest of the work for us.
395 */
396
397 static void isicom_tx(unsigned long _data)
398 {
399 unsigned long flags, base;
400 unsigned int retries;
401 short count = (BOARD_COUNT-1), card;
402 short txcount, wrd, residue, word_count, cnt;
403 struct isi_port *port;
404 struct tty_struct *tty;
405
406 /* find next active board */
407 card = (prev_card + 1) & 0x0003;
408 while(count-- > 0) {
409 if (isi_card[card].status & BOARD_ACTIVE)
410 break;
411 card = (card + 1) & 0x0003;
412 }
413 if (!(isi_card[card].status & BOARD_ACTIVE))
414 goto sched_again;
415
416 prev_card = card;
417
418 count = isi_card[card].port_count;
419 port = isi_card[card].ports;
420 base = isi_card[card].base;
421
422 spin_lock_irqsave(&isi_card[card].card_lock, flags);
423 for (retries = 0; retries < 100; retries++) {
424 if (inw(base + 0xe) & 0x1)
425 break;
426 udelay(2);
427 }
428 if (retries >= 100)
429 goto unlock;
430
431 for (;count > 0;count--, port++) {
432 /* port not active or tx disabled to force flow control */
433 if (!(port->flags & ASYNC_INITIALIZED) ||
434 !(port->status & ISI_TXOK))
435 continue;
436
437 tty = port->tty;
438
439 if (tty == NULL)
440 continue;
441
442 txcount = min_t(short, TX_SIZE, port->xmit_cnt);
443 if (txcount <= 0 || tty->stopped || tty->hw_stopped)
444 continue;
445
446 if (!(inw(base + 0x02) & (1 << port->channel)))
447 continue;
448
449 pr_dbg("txing %d bytes, port%d.\n", txcount,
450 port->channel + 1);
451 outw((port->channel << isi_card[card].shift_count) | txcount,
452 base);
453 residue = NO;
454 wrd = 0;
455 while (1) {
456 cnt = min_t(int, txcount, (SERIAL_XMIT_SIZE
457 - port->xmit_tail));
458 if (residue == YES) {
459 residue = NO;
460 if (cnt > 0) {
461 wrd |= (port->xmit_buf[port->xmit_tail]
462 << 8);
463 port->xmit_tail = (port->xmit_tail + 1)
464 & (SERIAL_XMIT_SIZE - 1);
465 port->xmit_cnt--;
466 txcount--;
467 cnt--;
468 outw(wrd, base);
469 } else {
470 outw(wrd, base);
471 break;
472 }
473 }
474 if (cnt <= 0) break;
475 word_count = cnt >> 1;
476 outsw(base, port->xmit_buf+port->xmit_tail,word_count);
477 port->xmit_tail = (port->xmit_tail
478 + (word_count << 1)) & (SERIAL_XMIT_SIZE - 1);
479 txcount -= (word_count << 1);
480 port->xmit_cnt -= (word_count << 1);
481 if (cnt & 0x0001) {
482 residue = YES;
483 wrd = port->xmit_buf[port->xmit_tail];
484 port->xmit_tail = (port->xmit_tail + 1)
485 & (SERIAL_XMIT_SIZE - 1);
486 port->xmit_cnt--;
487 txcount--;
488 }
489 }
490
491 InterruptTheCard(base);
492 if (port->xmit_cnt <= 0)
493 port->status &= ~ISI_TXOK;
494 if (port->xmit_cnt <= WAKEUP_CHARS)
495 tty_wakeup(tty);
496 }
497
498 unlock:
499 spin_unlock_irqrestore(&isi_card[card].card_lock, flags);
500 /* schedule another tx for hopefully in about 10ms */
501 sched_again:
502 mod_timer(&tx, jiffies + msecs_to_jiffies(10));
503 }
504
505 /*
506 * Main interrupt handler routine
507 */
508
509 static irqreturn_t isicom_interrupt(int irq, void *dev_id)
510 {
511 struct isi_board *card = dev_id;
512 struct isi_port *port;
513 struct tty_struct *tty;
514 unsigned long base;
515 u16 header, word_count, count, channel;
516 short byte_count;
517 unsigned char *rp;
518
519 if (!card || !(card->status & FIRMWARE_LOADED))
520 return IRQ_NONE;
521
522 base = card->base;
523
524 /* did the card interrupt us? */
525 if (!(inw(base + 0x0e) & 0x02))
526 return IRQ_NONE;
527
528 spin_lock(&card->card_lock);
529
530 /*
531 * disable any interrupts from the PCI card and lower the
532 * interrupt line
533 */
534 outw(0x8000, base+0x04);
535 ClearInterrupt(base);
536
537 inw(base); /* get the dummy word out */
538 header = inw(base);
539 channel = (header & 0x7800) >> card->shift_count;
540 byte_count = header & 0xff;
541
542 if (channel + 1 > card->port_count) {
543 printk(KERN_WARNING "ISICOM: isicom_interrupt(0x%lx): "
544 "%d(channel) > port_count.\n", base, channel+1);
545 outw(0x0000, base+0x04); /* enable interrupts */
546 spin_unlock(&card->card_lock);
547 return IRQ_HANDLED;
548 }
549 port = card->ports + channel;
550 if (!(port->flags & ASYNC_INITIALIZED)) {
551 outw(0x0000, base+0x04); /* enable interrupts */
552 spin_unlock(&card->card_lock);
553 return IRQ_HANDLED;
554 }
555
556 tty = port->tty;
557 if (tty == NULL) {
558 word_count = byte_count >> 1;
559 while(byte_count > 1) {
560 inw(base);
561 byte_count -= 2;
562 }
563 if (byte_count & 0x01)
564 inw(base);
565 outw(0x0000, base+0x04); /* enable interrupts */
566 spin_unlock(&card->card_lock);
567 return IRQ_HANDLED;
568 }
569
570 if (header & 0x8000) { /* Status Packet */
571 header = inw(base);
572 switch(header & 0xff) {
573 case 0: /* Change in EIA signals */
574 if (port->flags & ASYNC_CHECK_CD) {
575 if (port->status & ISI_DCD) {
576 if (!(header & ISI_DCD)) {
577 /* Carrier has been lost */
578 pr_dbg("interrupt: DCD->low.\n"
579 );
580 port->status &= ~ISI_DCD;
581 tty_hangup(tty);
582 }
583 } else if (header & ISI_DCD) {
584 /* Carrier has been detected */
585 pr_dbg("interrupt: DCD->high.\n");
586 port->status |= ISI_DCD;
587 wake_up_interruptible(&port->open_wait);
588 }
589 } else {
590 if (header & ISI_DCD)
591 port->status |= ISI_DCD;
592 else
593 port->status &= ~ISI_DCD;
594 }
595
596 if (port->flags & ASYNC_CTS_FLOW) {
597 if (port->tty->hw_stopped) {
598 if (header & ISI_CTS) {
599 port->tty->hw_stopped = 0;
600 /* start tx ing */
601 port->status |= (ISI_TXOK
602 | ISI_CTS);
603 tty_wakeup(tty);
604 }
605 } else if (!(header & ISI_CTS)) {
606 port->tty->hw_stopped = 1;
607 /* stop tx ing */
608 port->status &= ~(ISI_TXOK | ISI_CTS);
609 }
610 } else {
611 if (header & ISI_CTS)
612 port->status |= ISI_CTS;
613 else
614 port->status &= ~ISI_CTS;
615 }
616
617 if (header & ISI_DSR)
618 port->status |= ISI_DSR;
619 else
620 port->status &= ~ISI_DSR;
621
622 if (header & ISI_RI)
623 port->status |= ISI_RI;
624 else
625 port->status &= ~ISI_RI;
626
627 break;
628
629 case 1: /* Received Break !!! */
630 tty_insert_flip_char(tty, 0, TTY_BREAK);
631 if (port->flags & ASYNC_SAK)
632 do_SAK(tty);
633 tty_flip_buffer_push(tty);
634 break;
635
636 case 2: /* Statistics */
637 pr_dbg("isicom_interrupt: stats!!!.\n");
638 break;
639
640 default:
641 pr_dbg("Intr: Unknown code in status packet.\n");
642 break;
643 }
644 } else { /* Data Packet */
645
646 count = tty_prepare_flip_string(tty, &rp, byte_count & ~1);
647 pr_dbg("Intr: Can rx %d of %d bytes.\n", count, byte_count);
648 word_count = count >> 1;
649 insw(base, rp, word_count);
650 byte_count -= (word_count << 1);
651 if (count & 0x0001) {
652 tty_insert_flip_char(tty, inw(base) & 0xff,
653 TTY_NORMAL);
654 byte_count -= 2;
655 }
656 if (byte_count > 0) {
657 pr_dbg("Intr(0x%lx:%d): Flip buffer overflow! dropping "
658 "bytes...\n", base, channel + 1);
659 while(byte_count > 0) { /* drain out unread xtra data */
660 inw(base);
661 byte_count -= 2;
662 }
663 }
664 tty_flip_buffer_push(tty);
665 }
666 outw(0x0000, base+0x04); /* enable interrupts */
667 spin_unlock(&card->card_lock);
668
669 return IRQ_HANDLED;
670 }
671
672 static void isicom_config_port(struct isi_port *port)
673 {
674 struct isi_board *card = port->card;
675 struct tty_struct *tty;
676 unsigned long baud;
677 unsigned long base = card->base;
678 u16 channel_setup, channel = port->channel,
679 shift_count = card->shift_count;
680 unsigned char flow_ctrl;
681
682 if (!(tty = port->tty) || !tty->termios)
683 return;
684 baud = C_BAUD(tty);
685 if (baud & CBAUDEX) {
686 baud &= ~CBAUDEX;
687
688 /* if CBAUDEX bit is on and the baud is set to either 50 or 75
689 * then the card is programmed for 57.6Kbps or 115Kbps
690 * respectively.
691 */
692
693 /* 1,2,3,4 => 57.6, 115.2, 230, 460 kbps resp. */
694 if (baud < 1 || baud > 4)
695 port->tty->termios->c_cflag &= ~CBAUDEX;
696 else
697 baud += 15;
698 }
699 if (baud == 15) {
700
701 /* the ASYNC_SPD_HI and ASYNC_SPD_VHI options are set
702 * by the set_serial_info ioctl ... this is done by
703 * the 'setserial' utility.
704 */
705
706 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
707 baud++; /* 57.6 Kbps */
708 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
709 baud +=2; /* 115 Kbps */
710 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
711 baud += 3; /* 230 kbps*/
712 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
713 baud += 4; /* 460 kbps*/
714 }
715 if (linuxb_to_isib[baud] == -1) {
716 /* hang up */
717 drop_dtr(port);
718 return;
719 }
720 else
721 raise_dtr(port);
722
723 if (WaitTillCardIsFree(base) == 0) {
724 outw(0x8000 | (channel << shift_count) |0x03, base);
725 outw(linuxb_to_isib[baud] << 8 | 0x03, base);
726 channel_setup = 0;
727 switch(C_CSIZE(tty)) {
728 case CS5:
729 channel_setup |= ISICOM_CS5;
730 break;
731 case CS6:
732 channel_setup |= ISICOM_CS6;
733 break;
734 case CS7:
735 channel_setup |= ISICOM_CS7;
736 break;
737 case CS8:
738 channel_setup |= ISICOM_CS8;
739 break;
740 }
741
742 if (C_CSTOPB(tty))
743 channel_setup |= ISICOM_2SB;
744 if (C_PARENB(tty)) {
745 channel_setup |= ISICOM_EVPAR;
746 if (C_PARODD(tty))
747 channel_setup |= ISICOM_ODPAR;
748 }
749 outw(channel_setup, base);
750 InterruptTheCard(base);
751 }
752 if (C_CLOCAL(tty))
753 port->flags &= ~ASYNC_CHECK_CD;
754 else
755 port->flags |= ASYNC_CHECK_CD;
756
757 /* flow control settings ...*/
758 flow_ctrl = 0;
759 port->flags &= ~ASYNC_CTS_FLOW;
760 if (C_CRTSCTS(tty)) {
761 port->flags |= ASYNC_CTS_FLOW;
762 flow_ctrl |= ISICOM_CTSRTS;
763 }
764 if (I_IXON(tty))
765 flow_ctrl |= ISICOM_RESPOND_XONXOFF;
766 if (I_IXOFF(tty))
767 flow_ctrl |= ISICOM_INITIATE_XONXOFF;
768
769 if (WaitTillCardIsFree(base) == 0) {
770 outw(0x8000 | (channel << shift_count) |0x04, base);
771 outw(flow_ctrl << 8 | 0x05, base);
772 outw((STOP_CHAR(tty)) << 8 | (START_CHAR(tty)), base);
773 InterruptTheCard(base);
774 }
775
776 /* rx enabled -> enable port for rx on the card */
777 if (C_CREAD(tty)) {
778 card->port_status |= (1 << channel);
779 outw(card->port_status, base + 0x02);
780 }
781 }
782
783 /* open et all */
784
785 static inline void isicom_setup_board(struct isi_board *bp)
786 {
787 int channel;
788 struct isi_port *port;
789 unsigned long flags;
790
791 spin_lock_irqsave(&bp->card_lock, flags);
792 if (bp->status & BOARD_ACTIVE) {
793 spin_unlock_irqrestore(&bp->card_lock, flags);
794 return;
795 }
796 port = bp->ports;
797 bp->status |= BOARD_ACTIVE;
798 for (channel = 0; channel < bp->port_count; channel++, port++)
799 drop_dtr_rts(port);
800 spin_unlock_irqrestore(&bp->card_lock, flags);
801 }
802
803 static int isicom_setup_port(struct isi_port *port)
804 {
805 struct isi_board *card = port->card;
806 unsigned long flags;
807
808 if (port->flags & ASYNC_INITIALIZED) {
809 return 0;
810 }
811 if (!port->xmit_buf) {
812 unsigned long page;
813
814 if (!(page = get_zeroed_page(GFP_KERNEL)))
815 return -ENOMEM;
816
817 if (port->xmit_buf) {
818 free_page(page);
819 return -ERESTARTSYS;
820 }
821 port->xmit_buf = (unsigned char *) page;
822 }
823
824 spin_lock_irqsave(&card->card_lock, flags);
825 if (port->tty)
826 clear_bit(TTY_IO_ERROR, &port->tty->flags);
827 if (port->count == 1)
828 card->count++;
829
830 port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
831
832 /* discard any residual data */
833 if (WaitTillCardIsFree(card->base) == 0) {
834 outw(0x8000 | (port->channel << card->shift_count) | 0x02,
835 card->base);
836 outw(((ISICOM_KILLTX | ISICOM_KILLRX) << 8) | 0x06, card->base);
837 InterruptTheCard(card->base);
838 }
839
840 isicom_config_port(port);
841 port->flags |= ASYNC_INITIALIZED;
842 spin_unlock_irqrestore(&card->card_lock, flags);
843
844 return 0;
845 }
846
847 static int block_til_ready(struct tty_struct *tty, struct file *filp,
848 struct isi_port *port)
849 {
850 struct isi_board *card = port->card;
851 int do_clocal = 0, retval;
852 unsigned long flags;
853 DECLARE_WAITQUEUE(wait, current);
854
855 /* block if port is in the process of being closed */
856
857 if (tty_hung_up_p(filp) || port->flags & ASYNC_CLOSING) {
858 pr_dbg("block_til_ready: close in progress.\n");
859 interruptible_sleep_on(&port->close_wait);
860 if (port->flags & ASYNC_HUP_NOTIFY)
861 return -EAGAIN;
862 else
863 return -ERESTARTSYS;
864 }
865
866 /* if non-blocking mode is set ... */
867
868 if ((filp->f_flags & O_NONBLOCK) ||
869 (tty->flags & (1 << TTY_IO_ERROR))) {
870 pr_dbg("block_til_ready: non-block mode.\n");
871 port->flags |= ASYNC_NORMAL_ACTIVE;
872 return 0;
873 }
874
875 if (C_CLOCAL(tty))
876 do_clocal = 1;
877
878 /* block waiting for DCD to be asserted, and while
879 callout dev is busy */
880 retval = 0;
881 add_wait_queue(&port->open_wait, &wait);
882
883 spin_lock_irqsave(&card->card_lock, flags);
884 if (!tty_hung_up_p(filp))
885 port->count--;
886 port->blocked_open++;
887 spin_unlock_irqrestore(&card->card_lock, flags);
888
889 while (1) {
890 raise_dtr_rts(port);
891
892 set_current_state(TASK_INTERRUPTIBLE);
893 if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)) {
894 if (port->flags & ASYNC_HUP_NOTIFY)
895 retval = -EAGAIN;
896 else
897 retval = -ERESTARTSYS;
898 break;
899 }
900 if (!(port->flags & ASYNC_CLOSING) &&
901 (do_clocal || (port->status & ISI_DCD))) {
902 break;
903 }
904 if (signal_pending(current)) {
905 retval = -ERESTARTSYS;
906 break;
907 }
908 schedule();
909 }
910 set_current_state(TASK_RUNNING);
911 remove_wait_queue(&port->open_wait, &wait);
912 spin_lock_irqsave(&card->card_lock, flags);
913 if (!tty_hung_up_p(filp))
914 port->count++;
915 port->blocked_open--;
916 spin_unlock_irqrestore(&card->card_lock, flags);
917 if (retval)
918 return retval;
919 port->flags |= ASYNC_NORMAL_ACTIVE;
920 return 0;
921 }
922
923 static int isicom_open(struct tty_struct *tty, struct file *filp)
924 {
925 struct isi_port *port;
926 struct isi_board *card;
927 unsigned int board;
928 int error, line;
929
930 line = tty->index;
931 if (line < 0 || line > PORT_COUNT-1)
932 return -ENODEV;
933 board = BOARD(line);
934 card = &isi_card[board];
935
936 if (!(card->status & FIRMWARE_LOADED))
937 return -ENODEV;
938
939 /* open on a port greater than the port count for the card !!! */
940 if (line > ((board * 16) + card->port_count - 1))
941 return -ENODEV;
942
943 port = &isi_ports[line];
944 if (isicom_paranoia_check(port, tty->name, "isicom_open"))
945 return -ENODEV;
946
947 isicom_setup_board(card);
948
949 port->count++;
950 tty->driver_data = port;
951 port->tty = tty;
952 if ((error = isicom_setup_port(port))!=0)
953 return error;
954 if ((error = block_til_ready(tty, filp, port))!=0)
955 return error;
956
957 return 0;
958 }
959
960 /* close et all */
961
962 static inline void isicom_shutdown_board(struct isi_board *bp)
963 {
964 if (bp->status & BOARD_ACTIVE) {
965 bp->status &= ~BOARD_ACTIVE;
966 }
967 }
968
969 /* card->lock HAS to be held */
970 static void isicom_shutdown_port(struct isi_port *port)
971 {
972 struct isi_board *card = port->card;
973 struct tty_struct *tty;
974
975 tty = port->tty;
976
977 if (!(port->flags & ASYNC_INITIALIZED))
978 return;
979
980 if (port->xmit_buf) {
981 free_page((unsigned long) port->xmit_buf);
982 port->xmit_buf = NULL;
983 }
984 port->flags &= ~ASYNC_INITIALIZED;
985 /* 3rd October 2000 : Vinayak P Risbud */
986 port->tty = NULL;
987
988 /*Fix done by Anil .S on 30-04-2001
989 remote login through isi port has dtr toggle problem
990 due to which the carrier drops before the password prompt
991 appears on the remote end. Now we drop the dtr only if the
992 HUPCL(Hangup on close) flag is set for the tty*/
993
994 if (C_HUPCL(tty))
995 /* drop dtr on this port */
996 drop_dtr(port);
997
998 /* any other port uninits */
999 if (tty)
1000 set_bit(TTY_IO_ERROR, &tty->flags);
1001
1002 if (--card->count < 0) {
1003 pr_dbg("isicom_shutdown_port: bad board(0x%lx) count %d.\n",
1004 card->base, card->count);
1005 card->count = 0;
1006 }
1007
1008 /* last port was closed, shutdown that boad too */
1009 if (C_HUPCL(tty)) {
1010 if (!card->count)
1011 isicom_shutdown_board(card);
1012 }
1013 }
1014
1015 static void isicom_close(struct tty_struct *tty, struct file *filp)
1016 {
1017 struct isi_port *port = tty->driver_data;
1018 struct isi_board *card;
1019 unsigned long flags;
1020
1021 if (!port)
1022 return;
1023 card = port->card;
1024 if (isicom_paranoia_check(port, tty->name, "isicom_close"))
1025 return;
1026
1027 pr_dbg("Close start!!!.\n");
1028
1029 spin_lock_irqsave(&card->card_lock, flags);
1030 if (tty_hung_up_p(filp)) {
1031 spin_unlock_irqrestore(&card->card_lock, flags);
1032 return;
1033 }
1034
1035 if (tty->count == 1 && port->count != 1) {
1036 printk(KERN_WARNING "ISICOM:(0x%lx) isicom_close: bad port "
1037 "count tty->count = 1 port count = %d.\n",
1038 card->base, port->count);
1039 port->count = 1;
1040 }
1041 if (--port->count < 0) {
1042 printk(KERN_WARNING "ISICOM:(0x%lx) isicom_close: bad port "
1043 "count for channel%d = %d", card->base, port->channel,
1044 port->count);
1045 port->count = 0;
1046 }
1047
1048 if (port->count) {
1049 spin_unlock_irqrestore(&card->card_lock, flags);
1050 return;
1051 }
1052 port->flags |= ASYNC_CLOSING;
1053 tty->closing = 1;
1054 spin_unlock_irqrestore(&card->card_lock, flags);
1055
1056 if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE)
1057 tty_wait_until_sent(tty, port->closing_wait);
1058 /* indicate to the card that no more data can be received
1059 on this port */
1060 spin_lock_irqsave(&card->card_lock, flags);
1061 if (port->flags & ASYNC_INITIALIZED) {
1062 card->port_status &= ~(1 << port->channel);
1063 outw(card->port_status, card->base + 0x02);
1064 }
1065 isicom_shutdown_port(port);
1066 spin_unlock_irqrestore(&card->card_lock, flags);
1067
1068 if (tty->driver->flush_buffer)
1069 tty->driver->flush_buffer(tty);
1070 tty_ldisc_flush(tty);
1071
1072 spin_lock_irqsave(&card->card_lock, flags);
1073 tty->closing = 0;
1074
1075 if (port->blocked_open) {
1076 spin_unlock_irqrestore(&card->card_lock, flags);
1077 if (port->close_delay) {
1078 pr_dbg("scheduling until time out.\n");
1079 msleep_interruptible(
1080 jiffies_to_msecs(port->close_delay));
1081 }
1082 spin_lock_irqsave(&card->card_lock, flags);
1083 wake_up_interruptible(&port->open_wait);
1084 }
1085 port->flags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_CLOSING);
1086 wake_up_interruptible(&port->close_wait);
1087 spin_unlock_irqrestore(&card->card_lock, flags);
1088 }
1089
1090 /* write et all */
1091 static int isicom_write(struct tty_struct *tty, const unsigned char *buf,
1092 int count)
1093 {
1094 struct isi_port *port = tty->driver_data;
1095 struct isi_board *card = port->card;
1096 unsigned long flags;
1097 int cnt, total = 0;
1098
1099 if (isicom_paranoia_check(port, tty->name, "isicom_write"))
1100 return 0;
1101
1102 if (!port->xmit_buf)
1103 return 0;
1104
1105 spin_lock_irqsave(&card->card_lock, flags);
1106
1107 while(1) {
1108 cnt = min_t(int, count, min(SERIAL_XMIT_SIZE - port->xmit_cnt
1109 - 1, SERIAL_XMIT_SIZE - port->xmit_head));
1110 if (cnt <= 0)
1111 break;
1112
1113 memcpy(port->xmit_buf + port->xmit_head, buf, cnt);
1114 port->xmit_head = (port->xmit_head + cnt) & (SERIAL_XMIT_SIZE
1115 - 1);
1116 port->xmit_cnt += cnt;
1117 buf += cnt;
1118 count -= cnt;
1119 total += cnt;
1120 }
1121 if (port->xmit_cnt && !tty->stopped && !tty->hw_stopped)
1122 port->status |= ISI_TXOK;
1123 spin_unlock_irqrestore(&card->card_lock, flags);
1124 return total;
1125 }
1126
1127 /* put_char et all */
1128 static void isicom_put_char(struct tty_struct *tty, unsigned char ch)
1129 {
1130 struct isi_port *port = tty->driver_data;
1131 struct isi_board *card = port->card;
1132 unsigned long flags;
1133
1134 if (isicom_paranoia_check(port, tty->name, "isicom_put_char"))
1135 return;
1136
1137 if (!port->xmit_buf)
1138 return;
1139
1140 spin_lock_irqsave(&card->card_lock, flags);
1141 if (port->xmit_cnt >= SERIAL_XMIT_SIZE - 1) {
1142 spin_unlock_irqrestore(&card->card_lock, flags);
1143 return;
1144 }
1145
1146 port->xmit_buf[port->xmit_head++] = ch;
1147 port->xmit_head &= (SERIAL_XMIT_SIZE - 1);
1148 port->xmit_cnt++;
1149 spin_unlock_irqrestore(&card->card_lock, flags);
1150 }
1151
1152 /* flush_chars et all */
1153 static void isicom_flush_chars(struct tty_struct *tty)
1154 {
1155 struct isi_port *port = tty->driver_data;
1156
1157 if (isicom_paranoia_check(port, tty->name, "isicom_flush_chars"))
1158 return;
1159
1160 if (port->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
1161 !port->xmit_buf)
1162 return;
1163
1164 /* this tells the transmitter to consider this port for
1165 data output to the card ... that's the best we can do. */
1166 port->status |= ISI_TXOK;
1167 }
1168
1169 /* write_room et all */
1170 static int isicom_write_room(struct tty_struct *tty)
1171 {
1172 struct isi_port *port = tty->driver_data;
1173 int free;
1174
1175 if (isicom_paranoia_check(port, tty->name, "isicom_write_room"))
1176 return 0;
1177
1178 free = SERIAL_XMIT_SIZE - port->xmit_cnt - 1;
1179 if (free < 0)
1180 free = 0;
1181 return free;
1182 }
1183
1184 /* chars_in_buffer et all */
1185 static int isicom_chars_in_buffer(struct tty_struct *tty)
1186 {
1187 struct isi_port *port = tty->driver_data;
1188 if (isicom_paranoia_check(port, tty->name, "isicom_chars_in_buffer"))
1189 return 0;
1190 return port->xmit_cnt;
1191 }
1192
1193 /* ioctl et all */
1194 static inline void isicom_send_break(struct isi_port *port,
1195 unsigned long length)
1196 {
1197 struct isi_board *card = port->card;
1198 unsigned long base = card->base;
1199
1200 if (!lock_card(card))
1201 return;
1202
1203 outw(0x8000 | ((port->channel) << (card->shift_count)) | 0x3, base);
1204 outw((length & 0xff) << 8 | 0x00, base);
1205 outw((length & 0xff00), base);
1206 InterruptTheCard(base);
1207
1208 unlock_card(card);
1209 }
1210
1211 static int isicom_tiocmget(struct tty_struct *tty, struct file *file)
1212 {
1213 struct isi_port *port = tty->driver_data;
1214 /* just send the port status */
1215 u16 status = port->status;
1216
1217 if (isicom_paranoia_check(port, tty->name, "isicom_ioctl"))
1218 return -ENODEV;
1219
1220 return ((status & ISI_RTS) ? TIOCM_RTS : 0) |
1221 ((status & ISI_DTR) ? TIOCM_DTR : 0) |
1222 ((status & ISI_DCD) ? TIOCM_CAR : 0) |
1223 ((status & ISI_DSR) ? TIOCM_DSR : 0) |
1224 ((status & ISI_CTS) ? TIOCM_CTS : 0) |
1225 ((status & ISI_RI ) ? TIOCM_RI : 0);
1226 }
1227
1228 static int isicom_tiocmset(struct tty_struct *tty, struct file *file,
1229 unsigned int set, unsigned int clear)
1230 {
1231 struct isi_port *port = tty->driver_data;
1232 unsigned long flags;
1233
1234 if (isicom_paranoia_check(port, tty->name, "isicom_ioctl"))
1235 return -ENODEV;
1236
1237 spin_lock_irqsave(&port->card->card_lock, flags);
1238 if (set & TIOCM_RTS)
1239 raise_rts(port);
1240 if (set & TIOCM_DTR)
1241 raise_dtr(port);
1242
1243 if (clear & TIOCM_RTS)
1244 drop_rts(port);
1245 if (clear & TIOCM_DTR)
1246 drop_dtr(port);
1247 spin_unlock_irqrestore(&port->card->card_lock, flags);
1248
1249 return 0;
1250 }
1251
1252 static int isicom_set_serial_info(struct isi_port *port,
1253 struct serial_struct __user *info)
1254 {
1255 struct serial_struct newinfo;
1256 int reconfig_port;
1257
1258 if (copy_from_user(&newinfo, info, sizeof(newinfo)))
1259 return -EFAULT;
1260
1261 lock_kernel();
1262
1263 reconfig_port = ((port->flags & ASYNC_SPD_MASK) !=
1264 (newinfo.flags & ASYNC_SPD_MASK));
1265
1266 if (!capable(CAP_SYS_ADMIN)) {
1267 if ((newinfo.close_delay != port->close_delay) ||
1268 (newinfo.closing_wait != port->closing_wait) ||
1269 ((newinfo.flags & ~ASYNC_USR_MASK) !=
1270 (port->flags & ~ASYNC_USR_MASK))) {
1271 unlock_kernel();
1272 return -EPERM;
1273 }
1274 port->flags = ((port->flags & ~ ASYNC_USR_MASK) |
1275 (newinfo.flags & ASYNC_USR_MASK));
1276 }
1277 else {
1278 port->close_delay = newinfo.close_delay;
1279 port->closing_wait = newinfo.closing_wait;
1280 port->flags = ((port->flags & ~ASYNC_FLAGS) |
1281 (newinfo.flags & ASYNC_FLAGS));
1282 }
1283 if (reconfig_port) {
1284 unsigned long flags;
1285 spin_lock_irqsave(&port->card->card_lock, flags);
1286 isicom_config_port(port);
1287 spin_unlock_irqrestore(&port->card->card_lock, flags);
1288 }
1289 unlock_kernel();
1290 return 0;
1291 }
1292
1293 static int isicom_get_serial_info(struct isi_port *port,
1294 struct serial_struct __user *info)
1295 {
1296 struct serial_struct out_info;
1297
1298 lock_kernel();
1299 memset(&out_info, 0, sizeof(out_info));
1300 /* out_info.type = ? */
1301 out_info.line = port - isi_ports;
1302 out_info.port = port->card->base;
1303 out_info.irq = port->card->irq;
1304 out_info.flags = port->flags;
1305 /* out_info.baud_base = ? */
1306 out_info.close_delay = port->close_delay;
1307 out_info.closing_wait = port->closing_wait;
1308 unlock_kernel();
1309 if (copy_to_user(info, &out_info, sizeof(out_info)))
1310 return -EFAULT;
1311 return 0;
1312 }
1313
1314 static int isicom_ioctl(struct tty_struct *tty, struct file *filp,
1315 unsigned int cmd, unsigned long arg)
1316 {
1317 struct isi_port *port = tty->driver_data;
1318 void __user *argp = (void __user *)arg;
1319 int retval;
1320
1321 if (isicom_paranoia_check(port, tty->name, "isicom_ioctl"))
1322 return -ENODEV;
1323
1324 switch(cmd) {
1325 case TCSBRK:
1326 retval = tty_check_change(tty);
1327 if (retval)
1328 return retval;
1329 tty_wait_until_sent(tty, 0);
1330 if (!arg)
1331 isicom_send_break(port, HZ/4);
1332 return 0;
1333
1334 case TCSBRKP:
1335 retval = tty_check_change(tty);
1336 if (retval)
1337 return retval;
1338 tty_wait_until_sent(tty, 0);
1339 isicom_send_break(port, arg ? arg * (HZ/10) : HZ/4);
1340 return 0;
1341 case TIOCGSERIAL:
1342 return isicom_get_serial_info(port, argp);
1343
1344 case TIOCSSERIAL:
1345 return isicom_set_serial_info(port, argp);
1346
1347 default:
1348 return -ENOIOCTLCMD;
1349 }
1350 return 0;
1351 }
1352
1353 /* set_termios et all */
1354 static void isicom_set_termios(struct tty_struct *tty,
1355 struct ktermios *old_termios)
1356 {
1357 struct isi_port *port = tty->driver_data;
1358 unsigned long flags;
1359
1360 if (isicom_paranoia_check(port, tty->name, "isicom_set_termios"))
1361 return;
1362
1363 if (tty->termios->c_cflag == old_termios->c_cflag &&
1364 tty->termios->c_iflag == old_termios->c_iflag)
1365 return;
1366
1367 spin_lock_irqsave(&port->card->card_lock, flags);
1368 isicom_config_port(port);
1369 spin_unlock_irqrestore(&port->card->card_lock, flags);
1370
1371 if ((old_termios->c_cflag & CRTSCTS) &&
1372 !(tty->termios->c_cflag & CRTSCTS)) {
1373 tty->hw_stopped = 0;
1374 isicom_start(tty);
1375 }
1376 }
1377
1378 /* throttle et all */
1379 static void isicom_throttle(struct tty_struct *tty)
1380 {
1381 struct isi_port *port = tty->driver_data;
1382 struct isi_board *card = port->card;
1383
1384 if (isicom_paranoia_check(port, tty->name, "isicom_throttle"))
1385 return;
1386
1387 /* tell the card that this port cannot handle any more data for now */
1388 card->port_status &= ~(1 << port->channel);
1389 outw(card->port_status, card->base + 0x02);
1390 }
1391
1392 /* unthrottle et all */
1393 static void isicom_unthrottle(struct tty_struct *tty)
1394 {
1395 struct isi_port *port = tty->driver_data;
1396 struct isi_board *card = port->card;
1397
1398 if (isicom_paranoia_check(port, tty->name, "isicom_unthrottle"))
1399 return;
1400
1401 /* tell the card that this port is ready to accept more data */
1402 card->port_status |= (1 << port->channel);
1403 outw(card->port_status, card->base + 0x02);
1404 }
1405
1406 /* stop et all */
1407 static void isicom_stop(struct tty_struct *tty)
1408 {
1409 struct isi_port *port = tty->driver_data;
1410
1411 if (isicom_paranoia_check(port, tty->name, "isicom_stop"))
1412 return;
1413
1414 /* this tells the transmitter not to consider this port for
1415 data output to the card. */
1416 port->status &= ~ISI_TXOK;
1417 }
1418
1419 /* start et all */
1420 static void isicom_start(struct tty_struct *tty)
1421 {
1422 struct isi_port *port = tty->driver_data;
1423
1424 if (isicom_paranoia_check(port, tty->name, "isicom_start"))
1425 return;
1426
1427 /* this tells the transmitter to consider this port for
1428 data output to the card. */
1429 port->status |= ISI_TXOK;
1430 }
1431
1432 static void isicom_hangup(struct tty_struct *tty)
1433 {
1434 struct isi_port *port = tty->driver_data;
1435 unsigned long flags;
1436
1437 if (isicom_paranoia_check(port, tty->name, "isicom_hangup"))
1438 return;
1439
1440 spin_lock_irqsave(&port->card->card_lock, flags);
1441 isicom_shutdown_port(port);
1442 spin_unlock_irqrestore(&port->card->card_lock, flags);
1443
1444 port->count = 0;
1445 port->flags &= ~ASYNC_NORMAL_ACTIVE;
1446 port->tty = NULL;
1447 wake_up_interruptible(&port->open_wait);
1448 }
1449
1450 /* flush_buffer et all */
1451 static void isicom_flush_buffer(struct tty_struct *tty)
1452 {
1453 struct isi_port *port = tty->driver_data;
1454 struct isi_board *card = port->card;
1455 unsigned long flags;
1456
1457 if (isicom_paranoia_check(port, tty->name, "isicom_flush_buffer"))
1458 return;
1459
1460 spin_lock_irqsave(&card->card_lock, flags);
1461 port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
1462 spin_unlock_irqrestore(&card->card_lock, flags);
1463
1464 tty_wakeup(tty);
1465 }
1466
1467 /*
1468 * Driver init and deinit functions
1469 */
1470
1471 static const struct tty_operations isicom_ops = {
1472 .open = isicom_open,
1473 .close = isicom_close,
1474 .write = isicom_write,
1475 .put_char = isicom_put_char,
1476 .flush_chars = isicom_flush_chars,
1477 .write_room = isicom_write_room,
1478 .chars_in_buffer = isicom_chars_in_buffer,
1479 .ioctl = isicom_ioctl,
1480 .set_termios = isicom_set_termios,
1481 .throttle = isicom_throttle,
1482 .unthrottle = isicom_unthrottle,
1483 .stop = isicom_stop,
1484 .start = isicom_start,
1485 .hangup = isicom_hangup,
1486 .flush_buffer = isicom_flush_buffer,
1487 .tiocmget = isicom_tiocmget,
1488 .tiocmset = isicom_tiocmset,
1489 };
1490
1491 static int __devinit reset_card(struct pci_dev *pdev,
1492 const unsigned int card, unsigned int *signature)
1493 {
1494 struct isi_board *board = pci_get_drvdata(pdev);
1495 unsigned long base = board->base;
1496 unsigned int sig, portcount = 0;
1497 int retval = 0;
1498
1499 dev_dbg(&pdev->dev, "ISILoad:Resetting Card%d at 0x%lx\n", card + 1,
1500 base);
1501
1502 inw(base + 0x8);
1503
1504 msleep(10);
1505
1506 outw(0, base + 0x8); /* Reset */
1507
1508 msleep(1000);
1509
1510 sig = inw(base + 0x4) & 0xff;
1511
1512 if (sig != 0xa5 && sig != 0xbb && sig != 0xcc && sig != 0xdd &&
1513 sig != 0xee) {
1514 dev_warn(&pdev->dev, "ISILoad:Card%u reset failure (Possible "
1515 "bad I/O Port Address 0x%lx).\n", card + 1, base);
1516 dev_dbg(&pdev->dev, "Sig=0x%x\n", sig);
1517 retval = -EIO;
1518 goto end;
1519 }
1520
1521 msleep(10);
1522
1523 portcount = inw(base + 0x2);
1524 if (!(inw(base + 0xe) & 0x1) || (portcount != 0 && portcount != 4 &&
1525 portcount != 8 && portcount != 16)) {
1526 dev_err(&pdev->dev, "ISILoad:PCI Card%d reset failure.\n",
1527 card + 1);
1528 retval = -EIO;
1529 goto end;
1530 }
1531
1532 switch (sig) {
1533 case 0xa5:
1534 case 0xbb:
1535 case 0xdd:
1536 board->port_count = (portcount == 4) ? 4 : 8;
1537 board->shift_count = 12;
1538 break;
1539 case 0xcc:
1540 case 0xee:
1541 board->port_count = 16;
1542 board->shift_count = 11;
1543 break;
1544 }
1545 dev_info(&pdev->dev, "-Done\n");
1546 *signature = sig;
1547
1548 end:
1549 return retval;
1550 }
1551
1552 static int __devinit load_firmware(struct pci_dev *pdev,
1553 const unsigned int index, const unsigned int signature)
1554 {
1555 struct isi_board *board = pci_get_drvdata(pdev);
1556 const struct firmware *fw;
1557 unsigned long base = board->base;
1558 unsigned int a;
1559 u16 word_count, status;
1560 int retval = -EIO;
1561 char *name;
1562 u8 *data;
1563
1564 struct stframe {
1565 u16 addr;
1566 u16 count;
1567 u8 data[0];
1568 } *frame;
1569
1570 switch (signature) {
1571 case 0xa5:
1572 name = "isi608.bin";
1573 break;
1574 case 0xbb:
1575 name = "isi608em.bin";
1576 break;
1577 case 0xcc:
1578 name = "isi616em.bin";
1579 break;
1580 case 0xdd:
1581 name = "isi4608.bin";
1582 break;
1583 case 0xee:
1584 name = "isi4616.bin";
1585 break;
1586 default:
1587 dev_err(&pdev->dev, "Unknown signature.\n");
1588 goto end;
1589 }
1590
1591 retval = request_firmware(&fw, name, &pdev->dev);
1592 if (retval)
1593 goto end;
1594
1595 retval = -EIO;
1596
1597 for (frame = (struct stframe *)fw->data;
1598 frame < (struct stframe *)(fw->data + fw->size);
1599 frame = (struct stframe *)((u8 *)(frame + 1) +
1600 frame->count)) {
1601 if (WaitTillCardIsFree(base))
1602 goto errrelfw;
1603
1604 outw(0xf0, base); /* start upload sequence */
1605 outw(0x00, base);
1606 outw(frame->addr, base); /* lsb of address */
1607
1608 word_count = frame->count / 2 + frame->count % 2;
1609 outw(word_count, base);
1610 InterruptTheCard(base);
1611
1612 udelay(100); /* 0x2f */
1613
1614 if (WaitTillCardIsFree(base))
1615 goto errrelfw;
1616
1617 if ((status = inw(base + 0x4)) != 0) {
1618 dev_warn(&pdev->dev, "Card%d rejected load header:\n"
1619 KERN_WARNING "Address:0x%x\n"
1620 KERN_WARNING "Count:0x%x\n"
1621 KERN_WARNING "Status:0x%x\n",
1622 index + 1, frame->addr, frame->count, status);
1623 goto errrelfw;
1624 }
1625 outsw(base, frame->data, word_count);
1626
1627 InterruptTheCard(base);
1628
1629 udelay(50); /* 0x0f */
1630
1631 if (WaitTillCardIsFree(base))
1632 goto errrelfw;
1633
1634 if ((status = inw(base + 0x4)) != 0) {
1635 dev_err(&pdev->dev, "Card%d got out of sync.Card "
1636 "Status:0x%x\n", index + 1, status);
1637 goto errrelfw;
1638 }
1639 }
1640
1641 /* XXX: should we test it by reading it back and comparing with original like
1642 * in load firmware package? */
1643 for (frame = (struct stframe *)fw->data;
1644 frame < (struct stframe *)(fw->data + fw->size);
1645 frame = (struct stframe *)((u8 *)(frame + 1) +
1646 frame->count)) {
1647 if (WaitTillCardIsFree(base))
1648 goto errrelfw;
1649
1650 outw(0xf1, base); /* start download sequence */
1651 outw(0x00, base);
1652 outw(frame->addr, base); /* lsb of address */
1653
1654 word_count = (frame->count >> 1) + frame->count % 2;
1655 outw(word_count + 1, base);
1656 InterruptTheCard(base);
1657
1658 udelay(50); /* 0xf */
1659
1660 if (WaitTillCardIsFree(base))
1661 goto errrelfw;
1662
1663 if ((status = inw(base + 0x4)) != 0) {
1664 dev_warn(&pdev->dev, "Card%d rejected verify header:\n"
1665 KERN_WARNING "Address:0x%x\n"
1666 KERN_WARNING "Count:0x%x\n"
1667 KERN_WARNING "Status: 0x%x\n",
1668 index + 1, frame->addr, frame->count, status);
1669 goto errrelfw;
1670 }
1671
1672 data = kmalloc(word_count * 2, GFP_KERNEL);
1673 if (data == NULL) {
1674 dev_err(&pdev->dev, "Card%d, firmware upload "
1675 "failed, not enough memory\n", index + 1);
1676 goto errrelfw;
1677 }
1678 inw(base);
1679 insw(base, data, word_count);
1680 InterruptTheCard(base);
1681
1682 for (a = 0; a < frame->count; a++)
1683 if (data[a] != frame->data[a]) {
1684 kfree(data);
1685 dev_err(&pdev->dev, "Card%d, firmware upload "
1686 "failed\n", index + 1);
1687 goto errrelfw;
1688 }
1689 kfree(data);
1690
1691 udelay(50); /* 0xf */
1692
1693 if (WaitTillCardIsFree(base))
1694 goto errrelfw;
1695
1696 if ((status = inw(base + 0x4)) != 0) {
1697 dev_err(&pdev->dev, "Card%d verify got out of sync. "
1698 "Card Status:0x%x\n", index + 1, status);
1699 goto errrelfw;
1700 }
1701 }
1702
1703 /* xfer ctrl */
1704 if (WaitTillCardIsFree(base))
1705 goto errrelfw;
1706
1707 outw(0xf2, base);
1708 outw(0x800, base);
1709 outw(0x0, base);
1710 outw(0x0, base);
1711 InterruptTheCard(base);
1712 outw(0x0, base + 0x4); /* for ISI4608 cards */
1713
1714 board->status |= FIRMWARE_LOADED;
1715 retval = 0;
1716
1717 errrelfw:
1718 release_firmware(fw);
1719 end:
1720 return retval;
1721 }
1722
1723 /*
1724 * Insmod can set static symbols so keep these static
1725 */
1726 static unsigned int card_count;
1727
1728 static int __devinit isicom_probe(struct pci_dev *pdev,
1729 const struct pci_device_id *ent)
1730 {
1731 unsigned int signature, index;
1732 int retval = -EPERM;
1733 struct isi_board *board = NULL;
1734
1735 if (card_count >= BOARD_COUNT)
1736 goto err;
1737
1738 dev_info(&pdev->dev, "ISI PCI Card(Device ID 0x%x)\n", ent->device);
1739
1740 /* allot the first empty slot in the array */
1741 for (index = 0; index < BOARD_COUNT; index++)
1742 if (isi_card[index].base == 0) {
1743 board = &isi_card[index];
1744 break;
1745 }
1746
1747 board->index = index;
1748 board->base = pci_resource_start(pdev, 3);
1749 board->irq = pdev->irq;
1750 card_count++;
1751
1752 pci_set_drvdata(pdev, board);
1753
1754 retval = pci_request_region(pdev, 3, ISICOM_NAME);
1755 if (retval) {
1756 dev_err(&pdev->dev, "I/O Region 0x%lx-0x%lx is busy. Card%d "
1757 "will be disabled.\n", board->base, board->base + 15,
1758 index + 1);
1759 retval = -EBUSY;
1760 goto errdec;
1761 }
1762
1763 retval = request_irq(board->irq, isicom_interrupt,
1764 IRQF_SHARED | IRQF_DISABLED, ISICOM_NAME, board);
1765 if (retval < 0) {
1766 dev_err(&pdev->dev, "Could not install handler at Irq %d. "
1767 "Card%d will be disabled.\n", board->irq, index + 1);
1768 goto errunrr;
1769 }
1770
1771 retval = reset_card(pdev, index, &signature);
1772 if (retval < 0)
1773 goto errunri;
1774
1775 retval = load_firmware(pdev, index, signature);
1776 if (retval < 0)
1777 goto errunri;
1778
1779 for (index = 0; index < board->port_count; index++)
1780 tty_register_device(isicom_normal, board->index * 16 + index,
1781 &pdev->dev);
1782
1783 return 0;
1784
1785 errunri:
1786 free_irq(board->irq, board);
1787 errunrr:
1788 pci_release_region(pdev, 3);
1789 errdec:
1790 board->base = 0;
1791 card_count--;
1792 err:
1793 return retval;
1794 }
1795
1796 static void __devexit isicom_remove(struct pci_dev *pdev)
1797 {
1798 struct isi_board *board = pci_get_drvdata(pdev);
1799 unsigned int i;
1800
1801 for (i = 0; i < board->port_count; i++)
1802 tty_unregister_device(isicom_normal, board->index * 16 + i);
1803
1804 free_irq(board->irq, board);
1805 pci_release_region(pdev, 3);
1806 board->base = 0;
1807 card_count--;
1808 }
1809
1810 static int __init isicom_init(void)
1811 {
1812 int retval, idx, channel;
1813 struct isi_port *port;
1814
1815 for(idx = 0; idx < BOARD_COUNT; idx++) {
1816 port = &isi_ports[idx * 16];
1817 isi_card[idx].ports = port;
1818 spin_lock_init(&isi_card[idx].card_lock);
1819 for (channel = 0; channel < 16; channel++, port++) {
1820 port->magic = ISICOM_MAGIC;
1821 port->card = &isi_card[idx];
1822 port->channel = channel;
1823 port->close_delay = 50 * HZ/100;
1824 port->closing_wait = 3000 * HZ/100;
1825 port->status = 0;
1826 init_waitqueue_head(&port->open_wait);
1827 init_waitqueue_head(&port->close_wait);
1828 /* . . . */
1829 }
1830 isi_card[idx].base = 0;
1831 isi_card[idx].irq = 0;
1832 }
1833
1834 /* tty driver structure initialization */
1835 isicom_normal = alloc_tty_driver(PORT_COUNT);
1836 if (!isicom_normal) {
1837 retval = -ENOMEM;
1838 goto error;
1839 }
1840
1841 isicom_normal->owner = THIS_MODULE;
1842 isicom_normal->name = "ttyM";
1843 isicom_normal->major = ISICOM_NMAJOR;
1844 isicom_normal->minor_start = 0;
1845 isicom_normal->type = TTY_DRIVER_TYPE_SERIAL;
1846 isicom_normal->subtype = SERIAL_TYPE_NORMAL;
1847 isicom_normal->init_termios = tty_std_termios;
1848 isicom_normal->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL |
1849 CLOCAL;
1850 isicom_normal->flags = TTY_DRIVER_REAL_RAW |
1851 TTY_DRIVER_DYNAMIC_DEV;
1852 tty_set_operations(isicom_normal, &isicom_ops);
1853
1854 retval = tty_register_driver(isicom_normal);
1855 if (retval) {
1856 pr_dbg("Couldn't register the dialin driver\n");
1857 goto err_puttty;
1858 }
1859
1860 retval = pci_register_driver(&isicom_driver);
1861 if (retval < 0) {
1862 printk(KERN_ERR "ISICOM: Unable to register pci driver.\n");
1863 goto err_unrtty;
1864 }
1865
1866 mod_timer(&tx, jiffies + 1);
1867
1868 return 0;
1869 err_unrtty:
1870 tty_unregister_driver(isicom_normal);
1871 err_puttty:
1872 put_tty_driver(isicom_normal);
1873 error:
1874 return retval;
1875 }
1876
1877 static void __exit isicom_exit(void)
1878 {
1879 del_timer_sync(&tx);
1880
1881 pci_unregister_driver(&isicom_driver);
1882 tty_unregister_driver(isicom_normal);
1883 put_tty_driver(isicom_normal);
1884 }
1885
1886 module_init(isicom_init);
1887 module_exit(isicom_exit);
1888
1889 MODULE_AUTHOR("MultiTech");
1890 MODULE_DESCRIPTION("Driver for the ISI series of cards by MultiTech");
1891 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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