1 /*
2 * specialix.c -- specialix IO8+ multiport serial driver.
3 *
4 * Copyright (C) 1997 Roger Wolff (R.E.Wolff@BitWizard.nl)
5 * Copyright (C) 1994-1996 Dmitry Gorodchanin (pgmdsg@ibi.com)
6 *
7 * Specialix pays for the development and support of this driver.
8 * Please DO contact io8-linux@specialix.co.uk if you require
9 * support. But please read the documentation (specialix.txt)
10 * first.
11 *
12 * This driver was developped in the BitWizard linux device
13 * driver service. If you require a linux device driver for your
14 * product, please contact devices@BitWizard.nl for a quote.
15 *
16 * This code is firmly based on the riscom/8 serial driver,
17 * written by Dmitry Gorodchanin. The specialix IO8+ card
18 * programming information was obtained from the CL-CD1865 Data
19 * Book, and Specialix document number 6200059: IO8+ Hardware
20 * Functional Specification.
21 *
22 * This program is free software; you can redistribute it and/or
23 * modify it under the terms of the GNU General Public License as
24 * published by the Free Software Foundation; either version 2 of
25 * the License, or (at your option) any later version.
26 *
27 * This program is distributed in the hope that it will be
28 * useful, but WITHOUT ANY WARRANTY; without even the implied
29 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
30 * PURPOSE. See the GNU General Public License for more details.
31 *
32 * You should have received a copy of the GNU General Public
33 * License along with this program; if not, write to the Free
34 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139,
35 * USA.
36 *
37 * Revision history:
38 *
39 * Revision 1.0: April 1st 1997.
40 * Initial release for alpha testing.
41 * Revision 1.1: April 14th 1997.
42 * Incorporated Richard Hudsons suggestions,
43 * removed some debugging printk's.
44 * Revision 1.2: April 15th 1997.
45 * Ported to 2.1.x kernels.
46 * Revision 1.3: April 17th 1997
47 * Backported to 2.0. (Compatibility macros).
48 * Revision 1.4: April 18th 1997
49 * Fixed DTR/RTS bug that caused the card to indicate
50 * "don't send data" to a modem after the password prompt.
51 * Fixed bug for premature (fake) interrupts.
52 * Revision 1.5: April 19th 1997
53 * fixed a minor typo in the header file, cleanup a little.
54 * performance warnings are now MAXed at once per minute.
55 * Revision 1.6: May 23 1997
56 * Changed the specialix=... format to include interrupt.
57 * Revision 1.7: May 27 1997
58 * Made many more debug printk's a compile time option.
59 * Revision 1.8: Jul 1 1997
60 * port to linux-2.1.43 kernel.
61 * Revision 1.9: Oct 9 1998
62 * Added stuff for the IO8+/PCI version.
63 * Revision 1.10: Oct 22 1999 / Jan 21 2000.
64 * Added stuff for setserial.
65 * Nicolas Mailhot (Nicolas.Mailhot@email.enst.fr)
66 *
67 */
68
69 #define VERSION "1.11"
70
71
72 /*
73 * There is a bunch of documentation about the card, jumpers, config
74 * settings, restrictions, cables, device names and numbers in
75 * Documentation/serial/specialix.txt
76 */
77
78 #include <linux/module.h>
79
80 #include <linux/io.h>
81 #include <linux/kernel.h>
82 #include <linux/sched.h>
83 #include <linux/ioport.h>
84 #include <linux/interrupt.h>
85 #include <linux/errno.h>
86 #include <linux/tty.h>
87 #include <linux/tty_flip.h>
88 #include <linux/mm.h>
89 #include <linux/serial.h>
90 #include <linux/fcntl.h>
91 #include <linux/major.h>
92 #include <linux/delay.h>
93 #include <linux/pci.h>
94 #include <linux/init.h>
95 #include <linux/uaccess.h>
96
97 #include "specialix_io8.h"
98 #include "cd1865.h"
99
100
101 /*
102 This driver can spew a whole lot of debugging output at you. If you
103 need maximum performance, you should disable the DEBUG define. To
104 aid in debugging in the field, I'm leaving the compile-time debug
105 features enabled, and disable them "runtime". That allows me to
106 instruct people with problems to enable debugging without requiring
107 them to recompile...
108 */
109 #define DEBUG
110
111 static int sx_debug;
112 static int sx_rxfifo = SPECIALIX_RXFIFO;
113 static int sx_rtscts;
114
115 #ifdef DEBUG
116 #define dprintk(f, str...) if (sx_debug & f) printk(str)
117 #else
118 #define dprintk(f, str...) /* nothing */
119 #endif
120
121 #define SX_DEBUG_FLOW 0x0001
122 #define SX_DEBUG_DATA 0x0002
123 #define SX_DEBUG_PROBE 0x0004
124 #define SX_DEBUG_CHAN 0x0008
125 #define SX_DEBUG_INIT 0x0010
126 #define SX_DEBUG_RX 0x0020
127 #define SX_DEBUG_TX 0x0040
128 #define SX_DEBUG_IRQ 0x0080
129 #define SX_DEBUG_OPEN 0x0100
130 #define SX_DEBUG_TERMIOS 0x0200
131 #define SX_DEBUG_SIGNALS 0x0400
132 #define SX_DEBUG_FIFO 0x0800
133
134
135 #define func_enter() dprintk(SX_DEBUG_FLOW, "io8: enter %s\n", __func__)
136 #define func_exit() dprintk(SX_DEBUG_FLOW, "io8: exit %s\n", __func__)
137
138
139 /* Configurable options: */
140
141 /* Am I paranoid or not ? ;-) */
142 #define SPECIALIX_PARANOIA_CHECK
143
144 /*
145 * The following defines are mostly for testing purposes. But if you need
146 * some nice reporting in your syslog, you can define them also.
147 */
148 #undef SX_REPORT_FIFO
149 #undef SX_REPORT_OVERRUN
150
151
152
153
154 #define SPECIALIX_LEGAL_FLAGS \
155 (ASYNC_HUP_NOTIFY | ASYNC_SAK | ASYNC_SPLIT_TERMIOS | \
156 ASYNC_SPD_HI | ASYNC_SPEED_VHI | ASYNC_SESSION_LOCKOUT | \
157 ASYNC_PGRP_LOCKOUT | ASYNC_CALLOUT_NOHUP)
158
159 static struct tty_driver *specialix_driver;
160
161 static struct specialix_board sx_board[SX_NBOARD] = {
162 { 0, SX_IOBASE1, 9, },
163 { 0, SX_IOBASE2, 11, },
164 { 0, SX_IOBASE3, 12, },
165 { 0, SX_IOBASE4, 15, },
166 };
167
168 static struct specialix_port sx_port[SX_NBOARD * SX_NPORT];
169
170
sx_paranoia_check(struct specialix_port const * port,char * name,const char * routine)171 static int sx_paranoia_check(struct specialix_port const *port,
172 char *name, const char *routine)
173 {
174 #ifdef SPECIALIX_PARANOIA_CHECK
175 static const char *badmagic = KERN_ERR
176 "sx: Warning: bad specialix port magic number for device %s in %s\n";
177 static const char *badinfo = KERN_ERR
178 "sx: Warning: null specialix port for device %s in %s\n";
179
180 if (!port) {
181 printk(badinfo, name, routine);
182 return 1;
183 }
184 if (port->magic != SPECIALIX_MAGIC) {
185 printk(badmagic, name, routine);
186 return 1;
187 }
188 #endif
189 return 0;
190 }
191
192
193 /*
194 *
195 * Service functions for specialix IO8+ driver.
196 *
197 */
198
199 /* Get board number from pointer */
board_No(struct specialix_board * bp)200 static inline int board_No(struct specialix_board *bp)
201 {
202 return bp - sx_board;
203 }
204
205
206 /* Get port number from pointer */
port_No(struct specialix_port const * port)207 static inline int port_No(struct specialix_port const *port)
208 {
209 return SX_PORT(port - sx_port);
210 }
211
212
213 /* Get pointer to board from pointer to port */
port_Board(struct specialix_port const * port)214 static inline struct specialix_board *port_Board(
215 struct specialix_port const *port)
216 {
217 return &sx_board[SX_BOARD(port - sx_port)];
218 }
219
220
221 /* Input Byte from CL CD186x register */
sx_in(struct specialix_board * bp,unsigned short reg)222 static inline unsigned char sx_in(struct specialix_board *bp,
223 unsigned short reg)
224 {
225 bp->reg = reg | 0x80;
226 outb(reg | 0x80, bp->base + SX_ADDR_REG);
227 return inb(bp->base + SX_DATA_REG);
228 }
229
230
231 /* Output Byte to CL CD186x register */
sx_out(struct specialix_board * bp,unsigned short reg,unsigned char val)232 static inline void sx_out(struct specialix_board *bp, unsigned short reg,
233 unsigned char val)
234 {
235 bp->reg = reg | 0x80;
236 outb(reg | 0x80, bp->base + SX_ADDR_REG);
237 outb(val, bp->base + SX_DATA_REG);
238 }
239
240
241 /* Input Byte from CL CD186x register */
sx_in_off(struct specialix_board * bp,unsigned short reg)242 static inline unsigned char sx_in_off(struct specialix_board *bp,
243 unsigned short reg)
244 {
245 bp->reg = reg;
246 outb(reg, bp->base + SX_ADDR_REG);
247 return inb(bp->base + SX_DATA_REG);
248 }
249
250
251 /* Output Byte to CL CD186x register */
sx_out_off(struct specialix_board * bp,unsigned short reg,unsigned char val)252 static inline void sx_out_off(struct specialix_board *bp,
253 unsigned short reg, unsigned char val)
254 {
255 bp->reg = reg;
256 outb(reg, bp->base + SX_ADDR_REG);
257 outb(val, bp->base + SX_DATA_REG);
258 }
259
260
261 /* Wait for Channel Command Register ready */
sx_wait_CCR(struct specialix_board * bp)262 static void sx_wait_CCR(struct specialix_board *bp)
263 {
264 unsigned long delay, flags;
265 unsigned char ccr;
266
267 for (delay = SX_CCR_TIMEOUT; delay; delay--) {
268 spin_lock_irqsave(&bp->lock, flags);
269 ccr = sx_in(bp, CD186x_CCR);
270 spin_unlock_irqrestore(&bp->lock, flags);
271 if (!ccr)
272 return;
273 udelay(1);
274 }
275
276 printk(KERN_ERR "sx%d: Timeout waiting for CCR.\n", board_No(bp));
277 }
278
279
280 /* Wait for Channel Command Register ready */
sx_wait_CCR_off(struct specialix_board * bp)281 static void sx_wait_CCR_off(struct specialix_board *bp)
282 {
283 unsigned long delay;
284 unsigned char crr;
285 unsigned long flags;
286
287 for (delay = SX_CCR_TIMEOUT; delay; delay--) {
288 spin_lock_irqsave(&bp->lock, flags);
289 crr = sx_in_off(bp, CD186x_CCR);
290 spin_unlock_irqrestore(&bp->lock, flags);
291 if (!crr)
292 return;
293 udelay(1);
294 }
295
296 printk(KERN_ERR "sx%d: Timeout waiting for CCR.\n", board_No(bp));
297 }
298
299
300 /*
301 * specialix IO8+ IO range functions.
302 */
303
sx_request_io_range(struct specialix_board * bp)304 static int sx_request_io_range(struct specialix_board *bp)
305 {
306 return request_region(bp->base,
307 bp->flags & SX_BOARD_IS_PCI ? SX_PCI_IO_SPACE : SX_IO_SPACE,
308 "specialix IO8+") == NULL;
309 }
310
311
sx_release_io_range(struct specialix_board * bp)312 static void sx_release_io_range(struct specialix_board *bp)
313 {
314 release_region(bp->base, bp->flags & SX_BOARD_IS_PCI ?
315 SX_PCI_IO_SPACE : SX_IO_SPACE);
316 }
317
318
319 /* Set the IRQ using the RTS lines that run to the PAL on the board.... */
sx_set_irq(struct specialix_board * bp)320 static int sx_set_irq(struct specialix_board *bp)
321 {
322 int virq;
323 int i;
324 unsigned long flags;
325
326 if (bp->flags & SX_BOARD_IS_PCI)
327 return 1;
328 switch (bp->irq) {
329 /* In the same order as in the docs... */
330 case 15:
331 virq = 0;
332 break;
333 case 12:
334 virq = 1;
335 break;
336 case 11:
337 virq = 2;
338 break;
339 case 9:
340 virq = 3;
341 break;
342 default:printk(KERN_ERR
343 "Speclialix: cannot set irq to %d.\n", bp->irq);
344 return 0;
345 }
346 spin_lock_irqsave(&bp->lock, flags);
347 for (i = 0; i < 2; i++) {
348 sx_out(bp, CD186x_CAR, i);
349 sx_out(bp, CD186x_MSVRTS, ((virq >> i) & 0x1)? MSVR_RTS:0);
350 }
351 spin_unlock_irqrestore(&bp->lock, flags);
352 return 1;
353 }
354
355
356 /* Reset and setup CD186x chip */
sx_init_CD186x(struct specialix_board * bp)357 static int sx_init_CD186x(struct specialix_board *bp)
358 {
359 unsigned long flags;
360 int scaler;
361 int rv = 1;
362
363 func_enter();
364 sx_wait_CCR_off(bp); /* Wait for CCR ready */
365 spin_lock_irqsave(&bp->lock, flags);
366 sx_out_off(bp, CD186x_CCR, CCR_HARDRESET); /* Reset CD186x chip */
367 spin_unlock_irqrestore(&bp->lock, flags);
368 msleep(50); /* Delay 0.05 sec */
369 spin_lock_irqsave(&bp->lock, flags);
370 sx_out_off(bp, CD186x_GIVR, SX_ID); /* Set ID for this chip */
371 sx_out_off(bp, CD186x_GICR, 0); /* Clear all bits */
372 sx_out_off(bp, CD186x_PILR1, SX_ACK_MINT); /* Prio for modem intr */
373 sx_out_off(bp, CD186x_PILR2, SX_ACK_TINT); /* Prio for transmitter intr */
374 sx_out_off(bp, CD186x_PILR3, SX_ACK_RINT); /* Prio for receiver intr */
375 /* Set RegAckEn */
376 sx_out_off(bp, CD186x_SRCR, sx_in(bp, CD186x_SRCR) | SRCR_REGACKEN);
377
378 /* Setting up prescaler. We need 4 ticks per 1 ms */
379 scaler = SX_OSCFREQ/SPECIALIX_TPS;
380
381 sx_out_off(bp, CD186x_PPRH, scaler >> 8);
382 sx_out_off(bp, CD186x_PPRL, scaler & 0xff);
383 spin_unlock_irqrestore(&bp->lock, flags);
384
385 if (!sx_set_irq(bp)) {
386 /* Figure out how to pass this along... */
387 printk(KERN_ERR "Cannot set irq to %d.\n", bp->irq);
388 rv = 0;
389 }
390
391 func_exit();
392 return rv;
393 }
394
395
read_cross_byte(struct specialix_board * bp,int reg,int bit)396 static int read_cross_byte(struct specialix_board *bp, int reg, int bit)
397 {
398 int i;
399 int t;
400 unsigned long flags;
401
402 spin_lock_irqsave(&bp->lock, flags);
403 for (i = 0, t = 0; i < 8; i++) {
404 sx_out_off(bp, CD186x_CAR, i);
405 if (sx_in_off(bp, reg) & bit)
406 t |= 1 << i;
407 }
408 spin_unlock_irqrestore(&bp->lock, flags);
409
410 return t;
411 }
412
413
414 /* Main probing routine, also sets irq. */
sx_probe(struct specialix_board * bp)415 static int sx_probe(struct specialix_board *bp)
416 {
417 unsigned char val1, val2;
418 int rev;
419 int chip;
420
421 func_enter();
422
423 if (sx_request_io_range(bp)) {
424 func_exit();
425 return 1;
426 }
427
428 /* Are the I/O ports here ? */
429 sx_out_off(bp, CD186x_PPRL, 0x5a);
430 udelay(1);
431 val1 = sx_in_off(bp, CD186x_PPRL);
432
433 sx_out_off(bp, CD186x_PPRL, 0xa5);
434 udelay(1);
435 val2 = sx_in_off(bp, CD186x_PPRL);
436
437
438 if (val1 != 0x5a || val2 != 0xa5) {
439 printk(KERN_INFO
440 "sx%d: specialix IO8+ Board at 0x%03x not found.\n",
441 board_No(bp), bp->base);
442 sx_release_io_range(bp);
443 func_exit();
444 return 1;
445 }
446
447 /* Check the DSR lines that Specialix uses as board
448 identification */
449 val1 = read_cross_byte(bp, CD186x_MSVR, MSVR_DSR);
450 val2 = read_cross_byte(bp, CD186x_MSVR, MSVR_RTS);
451 dprintk(SX_DEBUG_INIT,
452 "sx%d: DSR lines are: %02x, rts lines are: %02x\n",
453 board_No(bp), val1, val2);
454
455 /* They managed to switch the bit order between the docs and
456 the IO8+ card. The new PCI card now conforms to old docs.
457 They changed the PCI docs to reflect the situation on the
458 old card. */
459 val2 = (bp->flags & SX_BOARD_IS_PCI)?0x4d : 0xb2;
460 if (val1 != val2) {
461 printk(KERN_INFO
462 "sx%d: specialix IO8+ ID %02x at 0x%03x not found (%02x).\n",
463 board_No(bp), val2, bp->base, val1);
464 sx_release_io_range(bp);
465 func_exit();
466 return 1;
467 }
468
469
470 /* Reset CD186x again */
471 if (!sx_init_CD186x(bp)) {
472 sx_release_io_range(bp);
473 func_exit();
474 return 1;
475 }
476
477 sx_request_io_range(bp);
478 bp->flags |= SX_BOARD_PRESENT;
479
480 /* Chip revcode pkgtype
481 GFRCR SRCR bit 7
482 CD180 rev B 0x81 0
483 CD180 rev C 0x82 0
484 CD1864 rev A 0x82 1
485 CD1865 rev A 0x83 1 -- Do not use!!! Does not work.
486 CD1865 rev B 0x84 1
487 -- Thanks to Gwen Wang, Cirrus Logic.
488 */
489
490 switch (sx_in_off(bp, CD186x_GFRCR)) {
491 case 0x82:
492 chip = 1864;
493 rev = 'A';
494 break;
495 case 0x83:
496 chip = 1865;
497 rev = 'A';
498 break;
499 case 0x84:
500 chip = 1865;
501 rev = 'B';
502 break;
503 case 0x85:
504 chip = 1865;
505 rev = 'C';
506 break; /* Does not exist at this time */
507 default:
508 chip = -1;
509 rev = 'x';
510 }
511
512 dprintk(SX_DEBUG_INIT, " GFCR = 0x%02x\n", sx_in_off(bp, CD186x_GFRCR));
513
514 printk(KERN_INFO
515 "sx%d: specialix IO8+ board detected at 0x%03x, IRQ %d, CD%d Rev. %c.\n",
516 board_No(bp), bp->base, bp->irq, chip, rev);
517
518 func_exit();
519 return 0;
520 }
521
522 /*
523 *
524 * Interrupt processing routines.
525 * */
526
sx_get_port(struct specialix_board * bp,unsigned char const * what)527 static struct specialix_port *sx_get_port(struct specialix_board *bp,
528 unsigned char const *what)
529 {
530 unsigned char channel;
531 struct specialix_port *port = NULL;
532
533 channel = sx_in(bp, CD186x_GICR) >> GICR_CHAN_OFF;
534 dprintk(SX_DEBUG_CHAN, "channel: %d\n", channel);
535 if (channel < CD186x_NCH) {
536 port = &sx_port[board_No(bp) * SX_NPORT + channel];
537 dprintk(SX_DEBUG_CHAN, "port: %d %p flags: 0x%lx\n",
538 board_No(bp) * SX_NPORT + channel, port,
539 port->port.flags & ASYNC_INITIALIZED);
540
541 if (port->port.flags & ASYNC_INITIALIZED) {
542 dprintk(SX_DEBUG_CHAN, "port: %d %p\n", channel, port);
543 func_exit();
544 return port;
545 }
546 }
547 printk(KERN_INFO "sx%d: %s interrupt from invalid port %d\n",
548 board_No(bp), what, channel);
549 return NULL;
550 }
551
552
sx_receive_exc(struct specialix_board * bp)553 static void sx_receive_exc(struct specialix_board *bp)
554 {
555 struct specialix_port *port;
556 struct tty_struct *tty;
557 unsigned char status;
558 unsigned char ch, flag;
559
560 func_enter();
561
562 port = sx_get_port(bp, "Receive");
563 if (!port) {
564 dprintk(SX_DEBUG_RX, "Hmm, couldn't find port.\n");
565 func_exit();
566 return;
567 }
568 tty = port->port.tty;
569
570 status = sx_in(bp, CD186x_RCSR);
571
572 dprintk(SX_DEBUG_RX, "status: 0x%x\n", status);
573 if (status & RCSR_OE) {
574 port->overrun++;
575 dprintk(SX_DEBUG_FIFO,
576 "sx%d: port %d: Overrun. Total %ld overruns.\n",
577 board_No(bp), port_No(port), port->overrun);
578 }
579 status &= port->mark_mask;
580
581 /* This flip buffer check needs to be below the reading of the
582 status register to reset the chip's IRQ.... */
583 if (tty_buffer_request_room(tty, 1) == 0) {
584 dprintk(SX_DEBUG_FIFO,
585 "sx%d: port %d: Working around flip buffer overflow.\n",
586 board_No(bp), port_No(port));
587 func_exit();
588 return;
589 }
590
591 ch = sx_in(bp, CD186x_RDR);
592 if (!status) {
593 func_exit();
594 return;
595 }
596 if (status & RCSR_TOUT) {
597 printk(KERN_INFO
598 "sx%d: port %d: Receiver timeout. Hardware problems ?\n",
599 board_No(bp), port_No(port));
600 func_exit();
601 return;
602
603 } else if (status & RCSR_BREAK) {
604 dprintk(SX_DEBUG_RX, "sx%d: port %d: Handling break...\n",
605 board_No(bp), port_No(port));
606 flag = TTY_BREAK;
607 if (port->port.flags & ASYNC_SAK)
608 do_SAK(tty);
609
610 } else if (status & RCSR_PE)
611 flag = TTY_PARITY;
612
613 else if (status & RCSR_FE)
614 flag = TTY_FRAME;
615
616 else if (status & RCSR_OE)
617 flag = TTY_OVERRUN;
618
619 else
620 flag = TTY_NORMAL;
621
622 if (tty_insert_flip_char(tty, ch, flag))
623 tty_flip_buffer_push(tty);
624 func_exit();
625 }
626
627
sx_receive(struct specialix_board * bp)628 static void sx_receive(struct specialix_board *bp)
629 {
630 struct specialix_port *port;
631 struct tty_struct *tty;
632 unsigned char count;
633
634 func_enter();
635
636 port = sx_get_port(bp, "Receive");
637 if (port == NULL) {
638 dprintk(SX_DEBUG_RX, "Hmm, couldn't find port.\n");
639 func_exit();
640 return;
641 }
642 tty = port->port.tty;
643
644 count = sx_in(bp, CD186x_RDCR);
645 dprintk(SX_DEBUG_RX, "port: %p: count: %d\n", port, count);
646 port->hits[count > 8 ? 9 : count]++;
647
648 tty_buffer_request_room(tty, count);
649
650 while (count--)
651 tty_insert_flip_char(tty, sx_in(bp, CD186x_RDR), TTY_NORMAL);
652 tty_flip_buffer_push(tty);
653 func_exit();
654 }
655
656
sx_transmit(struct specialix_board * bp)657 static void sx_transmit(struct specialix_board *bp)
658 {
659 struct specialix_port *port;
660 struct tty_struct *tty;
661 unsigned char count;
662
663 func_enter();
664 port = sx_get_port(bp, "Transmit");
665 if (port == NULL) {
666 func_exit();
667 return;
668 }
669 dprintk(SX_DEBUG_TX, "port: %p\n", port);
670 tty = port->port.tty;
671
672 if (port->IER & IER_TXEMPTY) {
673 /* FIFO drained */
674 sx_out(bp, CD186x_CAR, port_No(port));
675 port->IER &= ~IER_TXEMPTY;
676 sx_out(bp, CD186x_IER, port->IER);
677 func_exit();
678 return;
679 }
680
681 if ((port->xmit_cnt <= 0 && !port->break_length)
682 || tty->stopped || tty->hw_stopped) {
683 sx_out(bp, CD186x_CAR, port_No(port));
684 port->IER &= ~IER_TXRDY;
685 sx_out(bp, CD186x_IER, port->IER);
686 func_exit();
687 return;
688 }
689
690 if (port->break_length) {
691 if (port->break_length > 0) {
692 if (port->COR2 & COR2_ETC) {
693 sx_out(bp, CD186x_TDR, CD186x_C_ESC);
694 sx_out(bp, CD186x_TDR, CD186x_C_SBRK);
695 port->COR2 &= ~COR2_ETC;
696 }
697 count = min_t(int, port->break_length, 0xff);
698 sx_out(bp, CD186x_TDR, CD186x_C_ESC);
699 sx_out(bp, CD186x_TDR, CD186x_C_DELAY);
700 sx_out(bp, CD186x_TDR, count);
701 port->break_length -= count;
702 if (port->break_length == 0)
703 port->break_length--;
704 } else {
705 sx_out(bp, CD186x_TDR, CD186x_C_ESC);
706 sx_out(bp, CD186x_TDR, CD186x_C_EBRK);
707 sx_out(bp, CD186x_COR2, port->COR2);
708 sx_wait_CCR(bp);
709 sx_out(bp, CD186x_CCR, CCR_CORCHG2);
710 port->break_length = 0;
711 }
712
713 func_exit();
714 return;
715 }
716
717 count = CD186x_NFIFO;
718 do {
719 sx_out(bp, CD186x_TDR, port->xmit_buf[port->xmit_tail++]);
720 port->xmit_tail = port->xmit_tail & (SERIAL_XMIT_SIZE-1);
721 if (--port->xmit_cnt <= 0)
722 break;
723 } while (--count > 0);
724
725 if (port->xmit_cnt <= 0) {
726 sx_out(bp, CD186x_CAR, port_No(port));
727 port->IER &= ~IER_TXRDY;
728 sx_out(bp, CD186x_IER, port->IER);
729 }
730 if (port->xmit_cnt <= port->wakeup_chars)
731 tty_wakeup(tty);
732
733 func_exit();
734 }
735
736
sx_check_modem(struct specialix_board * bp)737 static void sx_check_modem(struct specialix_board *bp)
738 {
739 struct specialix_port *port;
740 struct tty_struct *tty;
741 unsigned char mcr;
742 int msvr_cd;
743
744 dprintk(SX_DEBUG_SIGNALS, "Modem intr. ");
745 port = sx_get_port(bp, "Modem");
746 if (port == NULL)
747 return;
748
749 tty = port->port.tty;
750
751 mcr = sx_in(bp, CD186x_MCR);
752
753 if ((mcr & MCR_CDCHG)) {
754 dprintk(SX_DEBUG_SIGNALS, "CD just changed... ");
755 msvr_cd = sx_in(bp, CD186x_MSVR) & MSVR_CD;
756 if (msvr_cd) {
757 dprintk(SX_DEBUG_SIGNALS, "Waking up guys in open.\n");
758 wake_up_interruptible(&port->port.open_wait);
759 } else {
760 dprintk(SX_DEBUG_SIGNALS, "Sending HUP.\n");
761 tty_hangup(tty);
762 }
763 }
764
765 #ifdef SPECIALIX_BRAIN_DAMAGED_CTS
766 if (mcr & MCR_CTSCHG) {
767 if (sx_in(bp, CD186x_MSVR) & MSVR_CTS) {
768 tty->hw_stopped = 0;
769 port->IER |= IER_TXRDY;
770 if (port->xmit_cnt <= port->wakeup_chars)
771 tty_wakeup(tty);
772 } else {
773 tty->hw_stopped = 1;
774 port->IER &= ~IER_TXRDY;
775 }
776 sx_out(bp, CD186x_IER, port->IER);
777 }
778 if (mcr & MCR_DSSXHG) {
779 if (sx_in(bp, CD186x_MSVR) & MSVR_DSR) {
780 tty->hw_stopped = 0;
781 port->IER |= IER_TXRDY;
782 if (port->xmit_cnt <= port->wakeup_chars)
783 tty_wakeup(tty);
784 } else {
785 tty->hw_stopped = 1;
786 port->IER &= ~IER_TXRDY;
787 }
788 sx_out(bp, CD186x_IER, port->IER);
789 }
790 #endif /* SPECIALIX_BRAIN_DAMAGED_CTS */
791
792 /* Clear change bits */
793 sx_out(bp, CD186x_MCR, 0);
794 }
795
796
797 /* The main interrupt processing routine */
sx_interrupt(int dummy,void * dev_id)798 static irqreturn_t sx_interrupt(int dummy, void *dev_id)
799 {
800 unsigned char status;
801 unsigned char ack;
802 struct specialix_board *bp = dev_id;
803 unsigned long loop = 0;
804 int saved_reg;
805 unsigned long flags;
806
807 func_enter();
808
809 spin_lock_irqsave(&bp->lock, flags);
810
811 dprintk(SX_DEBUG_FLOW, "enter %s port %d room: %ld\n", __func__,
812 port_No(sx_get_port(bp, "INT")),
813 SERIAL_XMIT_SIZE - sx_get_port(bp, "ITN")->xmit_cnt - 1);
814 if (!(bp->flags & SX_BOARD_ACTIVE)) {
815 dprintk(SX_DEBUG_IRQ, "sx: False interrupt. irq %d.\n",
816 bp->irq);
817 spin_unlock_irqrestore(&bp->lock, flags);
818 func_exit();
819 return IRQ_NONE;
820 }
821
822 saved_reg = bp->reg;
823
824 while (++loop < 16) {
825 status = sx_in(bp, CD186x_SRSR) &
826 (SRSR_RREQint | SRSR_TREQint | SRSR_MREQint);
827 if (status == 0)
828 break;
829 if (status & SRSR_RREQint) {
830 ack = sx_in(bp, CD186x_RRAR);
831
832 if (ack == (SX_ID | GIVR_IT_RCV))
833 sx_receive(bp);
834 else if (ack == (SX_ID | GIVR_IT_REXC))
835 sx_receive_exc(bp);
836 else
837 printk(KERN_ERR
838 "sx%d: status: 0x%x Bad receive ack 0x%02x.\n",
839 board_No(bp), status, ack);
840
841 } else if (status & SRSR_TREQint) {
842 ack = sx_in(bp, CD186x_TRAR);
843
844 if (ack == (SX_ID | GIVR_IT_TX))
845 sx_transmit(bp);
846 else
847 printk(KERN_ERR "sx%d: status: 0x%x Bad transmit ack 0x%02x. port: %d\n",
848 board_No(bp), status, ack,
849 port_No(sx_get_port(bp, "Int")));
850 } else if (status & SRSR_MREQint) {
851 ack = sx_in(bp, CD186x_MRAR);
852
853 if (ack == (SX_ID | GIVR_IT_MODEM))
854 sx_check_modem(bp);
855 else
856 printk(KERN_ERR
857 "sx%d: status: 0x%x Bad modem ack 0x%02x.\n",
858 board_No(bp), status, ack);
859
860 }
861
862 sx_out(bp, CD186x_EOIR, 0); /* Mark end of interrupt */
863 }
864 bp->reg = saved_reg;
865 outb(bp->reg, bp->base + SX_ADDR_REG);
866 spin_unlock_irqrestore(&bp->lock, flags);
867 func_exit();
868 return IRQ_HANDLED;
869 }
870
871
872 /*
873 * Routines for open & close processing.
874 */
875
turn_ints_off(struct specialix_board * bp)876 static void turn_ints_off(struct specialix_board *bp)
877 {
878 unsigned long flags;
879
880 func_enter();
881 spin_lock_irqsave(&bp->lock, flags);
882 (void) sx_in_off(bp, 0); /* Turn off interrupts. */
883 spin_unlock_irqrestore(&bp->lock, flags);
884
885 func_exit();
886 }
887
turn_ints_on(struct specialix_board * bp)888 static void turn_ints_on(struct specialix_board *bp)
889 {
890 unsigned long flags;
891
892 func_enter();
893
894 spin_lock_irqsave(&bp->lock, flags);
895 (void) sx_in(bp, 0); /* Turn ON interrupts. */
896 spin_unlock_irqrestore(&bp->lock, flags);
897
898 func_exit();
899 }
900
901
902 /* Called with disabled interrupts */
sx_setup_board(struct specialix_board * bp)903 static int sx_setup_board(struct specialix_board *bp)
904 {
905 int error;
906
907 if (bp->flags & SX_BOARD_ACTIVE)
908 return 0;
909
910 if (bp->flags & SX_BOARD_IS_PCI)
911 error = request_irq(bp->irq, sx_interrupt,
912 IRQF_DISABLED | IRQF_SHARED, "specialix IO8+", bp);
913 else
914 error = request_irq(bp->irq, sx_interrupt,
915 IRQF_DISABLED, "specialix IO8+", bp);
916
917 if (error)
918 return error;
919
920 turn_ints_on(bp);
921 bp->flags |= SX_BOARD_ACTIVE;
922
923 return 0;
924 }
925
926
927 /* Called with disabled interrupts */
sx_shutdown_board(struct specialix_board * bp)928 static void sx_shutdown_board(struct specialix_board *bp)
929 {
930 func_enter();
931
932 if (!(bp->flags & SX_BOARD_ACTIVE)) {
933 func_exit();
934 return;
935 }
936
937 bp->flags &= ~SX_BOARD_ACTIVE;
938
939 dprintk(SX_DEBUG_IRQ, "Freeing IRQ%d for board %d.\n",
940 bp->irq, board_No(bp));
941 free_irq(bp->irq, bp);
942 turn_ints_off(bp);
943 func_exit();
944 }
945
sx_crtscts(struct tty_struct * tty)946 static unsigned int sx_crtscts(struct tty_struct *tty)
947 {
948 if (sx_rtscts)
949 return C_CRTSCTS(tty);
950 return 1;
951 }
952
953 /*
954 * Setting up port characteristics.
955 * Must be called with disabled interrupts
956 */
sx_change_speed(struct specialix_board * bp,struct specialix_port * port)957 static void sx_change_speed(struct specialix_board *bp,
958 struct specialix_port *port)
959 {
960 struct tty_struct *tty;
961 unsigned long baud;
962 long tmp;
963 unsigned char cor1 = 0, cor3 = 0;
964 unsigned char mcor1 = 0, mcor2 = 0;
965 static unsigned long again;
966 unsigned long flags;
967
968 func_enter();
969
970 tty = port->port.tty;
971 if (!tty || !tty->termios) {
972 func_exit();
973 return;
974 }
975
976 port->IER = 0;
977 port->COR2 = 0;
978 /* Select port on the board */
979 spin_lock_irqsave(&bp->lock, flags);
980 sx_out(bp, CD186x_CAR, port_No(port));
981
982 /* The Specialix board doens't implement the RTS lines.
983 They are used to set the IRQ level. Don't touch them. */
984 if (sx_crtscts(tty))
985 port->MSVR = MSVR_DTR | (sx_in(bp, CD186x_MSVR) & MSVR_RTS);
986 else
987 port->MSVR = (sx_in(bp, CD186x_MSVR) & MSVR_RTS);
988 spin_unlock_irqrestore(&bp->lock, flags);
989 dprintk(SX_DEBUG_TERMIOS, "sx: got MSVR=%02x.\n", port->MSVR);
990 baud = tty_get_baud_rate(tty);
991
992 if (baud == 38400) {
993 if ((port->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
994 baud = 57600;
995 if ((port->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
996 baud = 115200;
997 }
998
999 if (!baud) {
1000 /* Drop DTR & exit */
1001 dprintk(SX_DEBUG_TERMIOS, "Dropping DTR... Hmm....\n");
1002 if (!sx_crtscts(tty)) {
1003 port->MSVR &= ~MSVR_DTR;
1004 spin_lock_irqsave(&bp->lock, flags);
1005 sx_out(bp, CD186x_MSVR, port->MSVR);
1006 spin_unlock_irqrestore(&bp->lock, flags);
1007 } else
1008 dprintk(SX_DEBUG_TERMIOS, "Can't drop DTR: no DTR.\n");
1009 return;
1010 } else {
1011 /* Set DTR on */
1012 if (!sx_crtscts(tty))
1013 port->MSVR |= MSVR_DTR;
1014 }
1015
1016 /*
1017 * Now we must calculate some speed depended things
1018 */
1019
1020 /* Set baud rate for port */
1021 tmp = port->custom_divisor ;
1022 if (tmp)
1023 printk(KERN_INFO
1024 "sx%d: Using custom baud rate divisor %ld. \n"
1025 "This is an untested option, please be careful.\n",
1026 port_No(port), tmp);
1027 else
1028 tmp = (((SX_OSCFREQ + baud/2) / baud + CD186x_TPC/2) /
1029 CD186x_TPC);
1030
1031 if (tmp < 0x10 && time_before(again, jiffies)) {
1032 again = jiffies + HZ * 60;
1033 /* Page 48 of version 2.0 of the CL-CD1865 databook */
1034 if (tmp >= 12) {
1035 printk(KERN_INFO "sx%d: Baud rate divisor is %ld. \n"
1036 "Performance degradation is possible.\n"
1037 "Read specialix.txt for more info.\n",
1038 port_No(port), tmp);
1039 } else {
1040 printk(KERN_INFO "sx%d: Baud rate divisor is %ld. \n"
1041 "Warning: overstressing Cirrus chip. This might not work.\n"
1042 "Read specialix.txt for more info.\n", port_No(port), tmp);
1043 }
1044 }
1045 spin_lock_irqsave(&bp->lock, flags);
1046 sx_out(bp, CD186x_RBPRH, (tmp >> 8) & 0xff);
1047 sx_out(bp, CD186x_TBPRH, (tmp >> 8) & 0xff);
1048 sx_out(bp, CD186x_RBPRL, tmp & 0xff);
1049 sx_out(bp, CD186x_TBPRL, tmp & 0xff);
1050 spin_unlock_irqrestore(&bp->lock, flags);
1051 if (port->custom_divisor)
1052 baud = (SX_OSCFREQ + port->custom_divisor/2) /
1053 port->custom_divisor;
1054 baud = (baud + 5) / 10; /* Estimated CPS */
1055
1056 /* Two timer ticks seems enough to wakeup something like SLIP driver */
1057 tmp = ((baud + HZ/2) / HZ) * 2 - CD186x_NFIFO;
1058 port->wakeup_chars = (tmp < 0) ? 0 : ((tmp >= SERIAL_XMIT_SIZE) ?
1059 SERIAL_XMIT_SIZE - 1 : tmp);
1060
1061 /* Receiver timeout will be transmission time for 1.5 chars */
1062 tmp = (SPECIALIX_TPS + SPECIALIX_TPS/2 + baud/2) / baud;
1063 tmp = (tmp > 0xff) ? 0xff : tmp;
1064 spin_lock_irqsave(&bp->lock, flags);
1065 sx_out(bp, CD186x_RTPR, tmp);
1066 spin_unlock_irqrestore(&bp->lock, flags);
1067 switch (C_CSIZE(tty)) {
1068 case CS5:
1069 cor1 |= COR1_5BITS;
1070 break;
1071 case CS6:
1072 cor1 |= COR1_6BITS;
1073 break;
1074 case CS7:
1075 cor1 |= COR1_7BITS;
1076 break;
1077 case CS8:
1078 cor1 |= COR1_8BITS;
1079 break;
1080 }
1081
1082 if (C_CSTOPB(tty))
1083 cor1 |= COR1_2SB;
1084
1085 cor1 |= COR1_IGNORE;
1086 if (C_PARENB(tty)) {
1087 cor1 |= COR1_NORMPAR;
1088 if (C_PARODD(tty))
1089 cor1 |= COR1_ODDP;
1090 if (I_INPCK(tty))
1091 cor1 &= ~COR1_IGNORE;
1092 }
1093 /* Set marking of some errors */
1094 port->mark_mask = RCSR_OE | RCSR_TOUT;
1095 if (I_INPCK(tty))
1096 port->mark_mask |= RCSR_FE | RCSR_PE;
1097 if (I_BRKINT(tty) || I_PARMRK(tty))
1098 port->mark_mask |= RCSR_BREAK;
1099 if (I_IGNPAR(tty))
1100 port->mark_mask &= ~(RCSR_FE | RCSR_PE);
1101 if (I_IGNBRK(tty)) {
1102 port->mark_mask &= ~RCSR_BREAK;
1103 if (I_IGNPAR(tty))
1104 /* Real raw mode. Ignore all */
1105 port->mark_mask &= ~RCSR_OE;
1106 }
1107 /* Enable Hardware Flow Control */
1108 if (C_CRTSCTS(tty)) {
1109 #ifdef SPECIALIX_BRAIN_DAMAGED_CTS
1110 port->IER |= IER_DSR | IER_CTS;
1111 mcor1 |= MCOR1_DSRZD | MCOR1_CTSZD;
1112 mcor2 |= MCOR2_DSROD | MCOR2_CTSOD;
1113 spin_lock_irqsave(&bp->lock, flags);
1114 tty->hw_stopped = !(sx_in(bp, CD186x_MSVR) &
1115 (MSVR_CTS|MSVR_DSR));
1116 spin_unlock_irqrestore(&bp->lock, flags);
1117 #else
1118 port->COR2 |= COR2_CTSAE;
1119 #endif
1120 }
1121 /* Enable Software Flow Control. FIXME: I'm not sure about this */
1122 /* Some people reported that it works, but I still doubt it */
1123 if (I_IXON(tty)) {
1124 port->COR2 |= COR2_TXIBE;
1125 cor3 |= (COR3_FCT | COR3_SCDE);
1126 if (I_IXANY(tty))
1127 port->COR2 |= COR2_IXM;
1128 spin_lock_irqsave(&bp->lock, flags);
1129 sx_out(bp, CD186x_SCHR1, START_CHAR(tty));
1130 sx_out(bp, CD186x_SCHR2, STOP_CHAR(tty));
1131 sx_out(bp, CD186x_SCHR3, START_CHAR(tty));
1132 sx_out(bp, CD186x_SCHR4, STOP_CHAR(tty));
1133 spin_unlock_irqrestore(&bp->lock, flags);
1134 }
1135 if (!C_CLOCAL(tty)) {
1136 /* Enable CD check */
1137 port->IER |= IER_CD;
1138 mcor1 |= MCOR1_CDZD;
1139 mcor2 |= MCOR2_CDOD;
1140 }
1141
1142 if (C_CREAD(tty))
1143 /* Enable receiver */
1144 port->IER |= IER_RXD;
1145
1146 /* Set input FIFO size (1-8 bytes) */
1147 cor3 |= sx_rxfifo;
1148 /* Setting up CD186x channel registers */
1149 spin_lock_irqsave(&bp->lock, flags);
1150 sx_out(bp, CD186x_COR1, cor1);
1151 sx_out(bp, CD186x_COR2, port->COR2);
1152 sx_out(bp, CD186x_COR3, cor3);
1153 spin_unlock_irqrestore(&bp->lock, flags);
1154 /* Make CD186x know about registers change */
1155 sx_wait_CCR(bp);
1156 spin_lock_irqsave(&bp->lock, flags);
1157 sx_out(bp, CD186x_CCR, CCR_CORCHG1 | CCR_CORCHG2 | CCR_CORCHG3);
1158 /* Setting up modem option registers */
1159 dprintk(SX_DEBUG_TERMIOS, "Mcor1 = %02x, mcor2 = %02x.\n",
1160 mcor1, mcor2);
1161 sx_out(bp, CD186x_MCOR1, mcor1);
1162 sx_out(bp, CD186x_MCOR2, mcor2);
1163 spin_unlock_irqrestore(&bp->lock, flags);
1164 /* Enable CD186x transmitter & receiver */
1165 sx_wait_CCR(bp);
1166 spin_lock_irqsave(&bp->lock, flags);
1167 sx_out(bp, CD186x_CCR, CCR_TXEN | CCR_RXEN);
1168 /* Enable interrupts */
1169 sx_out(bp, CD186x_IER, port->IER);
1170 /* And finally set the modem lines... */
1171 sx_out(bp, CD186x_MSVR, port->MSVR);
1172 spin_unlock_irqrestore(&bp->lock, flags);
1173
1174 func_exit();
1175 }
1176
1177
1178 /* Must be called with interrupts enabled */
sx_setup_port(struct specialix_board * bp,struct specialix_port * port)1179 static int sx_setup_port(struct specialix_board *bp,
1180 struct specialix_port *port)
1181 {
1182 unsigned long flags;
1183
1184 func_enter();
1185
1186 if (port->port.flags & ASYNC_INITIALIZED) {
1187 func_exit();
1188 return 0;
1189 }
1190
1191 if (!port->xmit_buf) {
1192 /* We may sleep in get_zeroed_page() */
1193 unsigned long tmp;
1194
1195 tmp = get_zeroed_page(GFP_KERNEL);
1196 if (tmp == 0L) {
1197 func_exit();
1198 return -ENOMEM;
1199 }
1200
1201 if (port->xmit_buf) {
1202 free_page(tmp);
1203 func_exit();
1204 return -ERESTARTSYS;
1205 }
1206 port->xmit_buf = (unsigned char *) tmp;
1207 }
1208
1209 spin_lock_irqsave(&port->lock, flags);
1210
1211 if (port->port.tty)
1212 clear_bit(TTY_IO_ERROR, &port->port.tty->flags);
1213
1214 port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
1215 sx_change_speed(bp, port);
1216 port->port.flags |= ASYNC_INITIALIZED;
1217
1218 spin_unlock_irqrestore(&port->lock, flags);
1219
1220
1221 func_exit();
1222 return 0;
1223 }
1224
1225
1226 /* Must be called with interrupts disabled */
sx_shutdown_port(struct specialix_board * bp,struct specialix_port * port)1227 static void sx_shutdown_port(struct specialix_board *bp,
1228 struct specialix_port *port)
1229 {
1230 struct tty_struct *tty;
1231 int i;
1232 unsigned long flags;
1233
1234 func_enter();
1235
1236 if (!(port->port.flags & ASYNC_INITIALIZED)) {
1237 func_exit();
1238 return;
1239 }
1240
1241 if (sx_debug & SX_DEBUG_FIFO) {
1242 dprintk(SX_DEBUG_FIFO,
1243 "sx%d: port %d: %ld overruns, FIFO hits [ ",
1244 board_No(bp), port_No(port), port->overrun);
1245 for (i = 0; i < 10; i++)
1246 dprintk(SX_DEBUG_FIFO, "%ld ", port->hits[i]);
1247 dprintk(SX_DEBUG_FIFO, "].\n");
1248 }
1249
1250 if (port->xmit_buf) {
1251 free_page((unsigned long) port->xmit_buf);
1252 port->xmit_buf = NULL;
1253 }
1254
1255 /* Select port */
1256 spin_lock_irqsave(&bp->lock, flags);
1257 sx_out(bp, CD186x_CAR, port_No(port));
1258
1259 tty = port->port.tty;
1260 if (tty == NULL || C_HUPCL(tty)) {
1261 /* Drop DTR */
1262 sx_out(bp, CD186x_MSVDTR, 0);
1263 }
1264 spin_unlock_irqrestore(&bp->lock, flags);
1265 /* Reset port */
1266 sx_wait_CCR(bp);
1267 spin_lock_irqsave(&bp->lock, flags);
1268 sx_out(bp, CD186x_CCR, CCR_SOFTRESET);
1269 /* Disable all interrupts from this port */
1270 port->IER = 0;
1271 sx_out(bp, CD186x_IER, port->IER);
1272 spin_unlock_irqrestore(&bp->lock, flags);
1273 if (tty)
1274 set_bit(TTY_IO_ERROR, &tty->flags);
1275 port->port.flags &= ~ASYNC_INITIALIZED;
1276
1277 if (!bp->count)
1278 sx_shutdown_board(bp);
1279 func_exit();
1280 }
1281
1282
block_til_ready(struct tty_struct * tty,struct file * filp,struct specialix_port * port)1283 static int block_til_ready(struct tty_struct *tty, struct file *filp,
1284 struct specialix_port *port)
1285 {
1286 DECLARE_WAITQUEUE(wait, current);
1287 struct specialix_board *bp = port_Board(port);
1288 int retval;
1289 int do_clocal = 0;
1290 int CD;
1291 unsigned long flags;
1292
1293 func_enter();
1294
1295 /*
1296 * If the device is in the middle of being closed, then block
1297 * until it's done, and then try again.
1298 */
1299 if (tty_hung_up_p(filp) || port->port.flags & ASYNC_CLOSING) {
1300 interruptible_sleep_on(&port->port.close_wait);
1301 if (port->port.flags & ASYNC_HUP_NOTIFY) {
1302 func_exit();
1303 return -EAGAIN;
1304 } else {
1305 func_exit();
1306 return -ERESTARTSYS;
1307 }
1308 }
1309
1310 /*
1311 * If non-blocking mode is set, or the port is not enabled,
1312 * then make the check up front and then exit.
1313 */
1314 if ((filp->f_flags & O_NONBLOCK) ||
1315 (tty->flags & (1 << TTY_IO_ERROR))) {
1316 port->port.flags |= ASYNC_NORMAL_ACTIVE;
1317 func_exit();
1318 return 0;
1319 }
1320
1321 if (C_CLOCAL(tty))
1322 do_clocal = 1;
1323
1324 /*
1325 * Block waiting for the carrier detect and the line to become
1326 * free (i.e., not in use by the callout). While we are in
1327 * this loop, info->count is dropped by one, so that
1328 * rs_close() knows when to free things. We restore it upon
1329 * exit, either normal or abnormal.
1330 */
1331 retval = 0;
1332 add_wait_queue(&port->port.open_wait, &wait);
1333 spin_lock_irqsave(&port->lock, flags);
1334 if (!tty_hung_up_p(filp))
1335 port->port.count--;
1336 spin_unlock_irqrestore(&port->lock, flags);
1337 port->port.blocked_open++;
1338 while (1) {
1339 spin_lock_irqsave(&bp->lock, flags);
1340 sx_out(bp, CD186x_CAR, port_No(port));
1341 CD = sx_in(bp, CD186x_MSVR) & MSVR_CD;
1342 if (sx_crtscts(tty)) {
1343 /* Activate RTS */
1344 port->MSVR |= MSVR_DTR; /* WTF? */
1345 sx_out(bp, CD186x_MSVR, port->MSVR);
1346 } else {
1347 /* Activate DTR */
1348 port->MSVR |= MSVR_DTR;
1349 sx_out(bp, CD186x_MSVR, port->MSVR);
1350 }
1351 spin_unlock_irqrestore(&bp->lock, flags);
1352 set_current_state(TASK_INTERRUPTIBLE);
1353 if (tty_hung_up_p(filp) ||
1354 !(port->port.flags & ASYNC_INITIALIZED)) {
1355 if (port->port.flags & ASYNC_HUP_NOTIFY)
1356 retval = -EAGAIN;
1357 else
1358 retval = -ERESTARTSYS;
1359 break;
1360 }
1361 if (!(port->port.flags & ASYNC_CLOSING) &&
1362 (do_clocal || CD))
1363 break;
1364 if (signal_pending(current)) {
1365 retval = -ERESTARTSYS;
1366 break;
1367 }
1368 schedule();
1369 }
1370
1371 set_current_state(TASK_RUNNING);
1372 remove_wait_queue(&port->port.open_wait, &wait);
1373 spin_lock_irqsave(&port->lock, flags);
1374 if (!tty_hung_up_p(filp))
1375 port->port.count++;
1376 port->port.blocked_open--;
1377 spin_unlock_irqrestore(&port->lock, flags);
1378 if (retval) {
1379 func_exit();
1380 return retval;
1381 }
1382
1383 port->port.flags |= ASYNC_NORMAL_ACTIVE;
1384 func_exit();
1385 return 0;
1386 }
1387
1388
sx_open(struct tty_struct * tty,struct file * filp)1389 static int sx_open(struct tty_struct *tty, struct file *filp)
1390 {
1391 int board;
1392 int error;
1393 struct specialix_port *port;
1394 struct specialix_board *bp;
1395 int i;
1396 unsigned long flags;
1397
1398 func_enter();
1399
1400 board = SX_BOARD(tty->index);
1401
1402 if (board >= SX_NBOARD || !(sx_board[board].flags & SX_BOARD_PRESENT)) {
1403 func_exit();
1404 return -ENODEV;
1405 }
1406
1407 bp = &sx_board[board];
1408 port = sx_port + board * SX_NPORT + SX_PORT(tty->index);
1409 port->overrun = 0;
1410 for (i = 0; i < 10; i++)
1411 port->hits[i] = 0;
1412
1413 dprintk(SX_DEBUG_OPEN,
1414 "Board = %d, bp = %p, port = %p, portno = %d.\n",
1415 board, bp, port, SX_PORT(tty->index));
1416
1417 if (sx_paranoia_check(port, tty->name, "sx_open")) {
1418 func_enter();
1419 return -ENODEV;
1420 }
1421
1422 error = sx_setup_board(bp);
1423 if (error) {
1424 func_exit();
1425 return error;
1426 }
1427
1428 spin_lock_irqsave(&bp->lock, flags);
1429 port->port.count++;
1430 bp->count++;
1431 tty->driver_data = port;
1432 port->port.tty = tty;
1433 spin_unlock_irqrestore(&bp->lock, flags);
1434
1435 error = sx_setup_port(bp, port);
1436 if (error) {
1437 func_enter();
1438 return error;
1439 }
1440
1441 error = block_til_ready(tty, filp, port);
1442 if (error) {
1443 func_enter();
1444 return error;
1445 }
1446
1447 func_exit();
1448 return 0;
1449 }
1450
sx_flush_buffer(struct tty_struct * tty)1451 static void sx_flush_buffer(struct tty_struct *tty)
1452 {
1453 struct specialix_port *port = tty->driver_data;
1454 unsigned long flags;
1455 struct specialix_board *bp;
1456
1457 func_enter();
1458
1459 if (sx_paranoia_check(port, tty->name, "sx_flush_buffer")) {
1460 func_exit();
1461 return;
1462 }
1463
1464 bp = port_Board(port);
1465 spin_lock_irqsave(&port->lock, flags);
1466 port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
1467 spin_unlock_irqrestore(&port->lock, flags);
1468 tty_wakeup(tty);
1469
1470 func_exit();
1471 }
1472
sx_close(struct tty_struct * tty,struct file * filp)1473 static void sx_close(struct tty_struct *tty, struct file *filp)
1474 {
1475 struct specialix_port *port = tty->driver_data;
1476 struct specialix_board *bp;
1477 unsigned long flags;
1478 unsigned long timeout;
1479
1480 func_enter();
1481 if (!port || sx_paranoia_check(port, tty->name, "close")) {
1482 func_exit();
1483 return;
1484 }
1485 spin_lock_irqsave(&port->lock, flags);
1486
1487 if (tty_hung_up_p(filp)) {
1488 spin_unlock_irqrestore(&port->lock, flags);
1489 func_exit();
1490 return;
1491 }
1492
1493 bp = port_Board(port);
1494 if (tty->count == 1 && port->port.count != 1) {
1495 printk(KERN_ERR "sx%d: sx_close: bad port count;"
1496 " tty->count is 1, port count is %d\n",
1497 board_No(bp), port->port.count);
1498 port->port.count = 1;
1499 }
1500
1501 if (port->port.count > 1) {
1502 port->port.count--;
1503 bp->count--;
1504
1505 spin_unlock_irqrestore(&port->lock, flags);
1506
1507 func_exit();
1508 return;
1509 }
1510 port->port.flags |= ASYNC_CLOSING;
1511 /*
1512 * Now we wait for the transmit buffer to clear; and we notify
1513 * the line discipline to only process XON/XOFF characters.
1514 */
1515 tty->closing = 1;
1516 spin_unlock_irqrestore(&port->lock, flags);
1517 dprintk(SX_DEBUG_OPEN, "Closing\n");
1518 if (port->port.closing_wait != ASYNC_CLOSING_WAIT_NONE)
1519 tty_wait_until_sent(tty, port->port.closing_wait);
1520 /*
1521 * At this point we stop accepting input. To do this, we
1522 * disable the receive line status interrupts, and tell the
1523 * interrupt driver to stop checking the data ready bit in the
1524 * line status register.
1525 */
1526 dprintk(SX_DEBUG_OPEN, "Closed\n");
1527 port->IER &= ~IER_RXD;
1528 if (port->port.flags & ASYNC_INITIALIZED) {
1529 port->IER &= ~IER_TXRDY;
1530 port->IER |= IER_TXEMPTY;
1531 spin_lock_irqsave(&bp->lock, flags);
1532 sx_out(bp, CD186x_CAR, port_No(port));
1533 sx_out(bp, CD186x_IER, port->IER);
1534 spin_unlock_irqrestore(&bp->lock, flags);
1535 /*
1536 * Before we drop DTR, make sure the UART transmitter
1537 * has completely drained; this is especially
1538 * important if there is a transmit FIFO!
1539 */
1540 timeout = jiffies+HZ;
1541 while (port->IER & IER_TXEMPTY) {
1542 set_current_state(TASK_INTERRUPTIBLE);
1543 msleep_interruptible(jiffies_to_msecs(port->timeout));
1544 if (time_after(jiffies, timeout)) {
1545 printk(KERN_INFO "Timeout waiting for close\n");
1546 break;
1547 }
1548 }
1549
1550 }
1551
1552 if (--bp->count < 0) {
1553 printk(KERN_ERR
1554 "sx%d: sx_shutdown_port: bad board count: %d port: %d\n",
1555 board_No(bp), bp->count, tty->index);
1556 bp->count = 0;
1557 }
1558 if (--port->port.count < 0) {
1559 printk(KERN_ERR
1560 "sx%d: sx_close: bad port count for tty%d: %d\n",
1561 board_No(bp), port_No(port), port->port.count);
1562 port->port.count = 0;
1563 }
1564
1565 sx_shutdown_port(bp, port);
1566 sx_flush_buffer(tty);
1567 tty_ldisc_flush(tty);
1568 spin_lock_irqsave(&port->lock, flags);
1569 tty->closing = 0;
1570 port->port.tty = NULL;
1571 spin_unlock_irqrestore(&port->lock, flags);
1572 if (port->port.blocked_open) {
1573 if (port->port.close_delay)
1574 msleep_interruptible(
1575 jiffies_to_msecs(port->port.close_delay));
1576 wake_up_interruptible(&port->port.open_wait);
1577 }
1578 port->port.flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
1579 wake_up_interruptible(&port->port.close_wait);
1580
1581 func_exit();
1582 }
1583
1584
sx_write(struct tty_struct * tty,const unsigned char * buf,int count)1585 static int sx_write(struct tty_struct *tty,
1586 const unsigned char *buf, int count)
1587 {
1588 struct specialix_port *port = tty->driver_data;
1589 struct specialix_board *bp;
1590 int c, total = 0;
1591 unsigned long flags;
1592
1593 func_enter();
1594 if (sx_paranoia_check(port, tty->name, "sx_write")) {
1595 func_exit();
1596 return 0;
1597 }
1598
1599 bp = port_Board(port);
1600
1601 if (!port->xmit_buf) {
1602 func_exit();
1603 return 0;
1604 }
1605
1606 while (1) {
1607 spin_lock_irqsave(&port->lock, flags);
1608 c = min_t(int, count, min(SERIAL_XMIT_SIZE - port->xmit_cnt - 1,
1609 SERIAL_XMIT_SIZE - port->xmit_head));
1610 if (c <= 0) {
1611 spin_unlock_irqrestore(&port->lock, flags);
1612 break;
1613 }
1614 memcpy(port->xmit_buf + port->xmit_head, buf, c);
1615 port->xmit_head = (port->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
1616 port->xmit_cnt += c;
1617 spin_unlock_irqrestore(&port->lock, flags);
1618
1619 buf += c;
1620 count -= c;
1621 total += c;
1622 }
1623
1624 spin_lock_irqsave(&bp->lock, flags);
1625 if (port->xmit_cnt && !tty->stopped && !tty->hw_stopped &&
1626 !(port->IER & IER_TXRDY)) {
1627 port->IER |= IER_TXRDY;
1628 sx_out(bp, CD186x_CAR, port_No(port));
1629 sx_out(bp, CD186x_IER, port->IER);
1630 }
1631 spin_unlock_irqrestore(&bp->lock, flags);
1632 func_exit();
1633
1634 return total;
1635 }
1636
1637
sx_put_char(struct tty_struct * tty,unsigned char ch)1638 static int sx_put_char(struct tty_struct *tty, unsigned char ch)
1639 {
1640 struct specialix_port *port = tty->driver_data;
1641 unsigned long flags;
1642 struct specialix_board *bp;
1643
1644 func_enter();
1645
1646 if (sx_paranoia_check(port, tty->name, "sx_put_char")) {
1647 func_exit();
1648 return 0;
1649 }
1650 dprintk(SX_DEBUG_TX, "check tty: %p %p\n", tty, port->xmit_buf);
1651 if (!port->xmit_buf) {
1652 func_exit();
1653 return 0;
1654 }
1655 bp = port_Board(port);
1656 spin_lock_irqsave(&port->lock, flags);
1657
1658 dprintk(SX_DEBUG_TX, "xmit_cnt: %d xmit_buf: %p\n",
1659 port->xmit_cnt, port->xmit_buf);
1660 if (port->xmit_cnt >= SERIAL_XMIT_SIZE - 1 || !port->xmit_buf) {
1661 spin_unlock_irqrestore(&port->lock, flags);
1662 dprintk(SX_DEBUG_TX, "Exit size\n");
1663 func_exit();
1664 return 0;
1665 }
1666 dprintk(SX_DEBUG_TX, "Handle xmit: %p %p\n", port, port->xmit_buf);
1667 port->xmit_buf[port->xmit_head++] = ch;
1668 port->xmit_head &= SERIAL_XMIT_SIZE - 1;
1669 port->xmit_cnt++;
1670 spin_unlock_irqrestore(&port->lock, flags);
1671
1672 func_exit();
1673 return 1;
1674 }
1675
1676
sx_flush_chars(struct tty_struct * tty)1677 static void sx_flush_chars(struct tty_struct *tty)
1678 {
1679 struct specialix_port *port = tty->driver_data;
1680 unsigned long flags;
1681 struct specialix_board *bp = port_Board(port);
1682
1683 func_enter();
1684
1685 if (sx_paranoia_check(port, tty->name, "sx_flush_chars")) {
1686 func_exit();
1687 return;
1688 }
1689 if (port->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
1690 !port->xmit_buf) {
1691 func_exit();
1692 return;
1693 }
1694 spin_lock_irqsave(&bp->lock, flags);
1695 port->IER |= IER_TXRDY;
1696 sx_out(port_Board(port), CD186x_CAR, port_No(port));
1697 sx_out(port_Board(port), CD186x_IER, port->IER);
1698 spin_unlock_irqrestore(&bp->lock, flags);
1699
1700 func_exit();
1701 }
1702
1703
sx_write_room(struct tty_struct * tty)1704 static int sx_write_room(struct tty_struct *tty)
1705 {
1706 struct specialix_port *port = tty->driver_data;
1707 int ret;
1708
1709 func_enter();
1710
1711 if (sx_paranoia_check(port, tty->name, "sx_write_room")) {
1712 func_exit();
1713 return 0;
1714 }
1715
1716 ret = SERIAL_XMIT_SIZE - port->xmit_cnt - 1;
1717 if (ret < 0)
1718 ret = 0;
1719
1720 func_exit();
1721 return ret;
1722 }
1723
1724
sx_chars_in_buffer(struct tty_struct * tty)1725 static int sx_chars_in_buffer(struct tty_struct *tty)
1726 {
1727 struct specialix_port *port = tty->driver_data;
1728
1729 func_enter();
1730
1731 if (sx_paranoia_check(port, tty->name, "sx_chars_in_buffer")) {
1732 func_exit();
1733 return 0;
1734 }
1735 func_exit();
1736 return port->xmit_cnt;
1737 }
1738
sx_tiocmget(struct tty_struct * tty,struct file * file)1739 static int sx_tiocmget(struct tty_struct *tty, struct file *file)
1740 {
1741 struct specialix_port *port = tty->driver_data;
1742 struct specialix_board *bp;
1743 unsigned char status;
1744 unsigned int result;
1745 unsigned long flags;
1746
1747 func_enter();
1748
1749 if (sx_paranoia_check(port, tty->name, __func__)) {
1750 func_exit();
1751 return -ENODEV;
1752 }
1753
1754 bp = port_Board(port);
1755 spin_lock_irqsave(&bp->lock, flags);
1756 sx_out(bp, CD186x_CAR, port_No(port));
1757 status = sx_in(bp, CD186x_MSVR);
1758 spin_unlock_irqrestore(&bp->lock, flags);
1759 dprintk(SX_DEBUG_INIT, "Got msvr[%d] = %02x, car = %d.\n",
1760 port_No(port), status, sx_in(bp, CD186x_CAR));
1761 dprintk(SX_DEBUG_INIT, "sx_port = %p, port = %p\n", sx_port, port);
1762 if (sx_crtscts(port->port.tty)) {
1763 result = TIOCM_DTR | TIOCM_DSR
1764 | ((status & MSVR_DTR) ? TIOCM_RTS : 0)
1765 | ((status & MSVR_CD) ? TIOCM_CAR : 0)
1766 | ((status & MSVR_CTS) ? TIOCM_CTS : 0);
1767 } else {
1768 result = TIOCM_RTS | TIOCM_DSR
1769 | ((status & MSVR_DTR) ? TIOCM_DTR : 0)
1770 | ((status & MSVR_CD) ? TIOCM_CAR : 0)
1771 | ((status & MSVR_CTS) ? TIOCM_CTS : 0);
1772 }
1773
1774 func_exit();
1775
1776 return result;
1777 }
1778
1779
sx_tiocmset(struct tty_struct * tty,struct file * file,unsigned int set,unsigned int clear)1780 static int sx_tiocmset(struct tty_struct *tty, struct file *file,
1781 unsigned int set, unsigned int clear)
1782 {
1783 struct specialix_port *port = tty->driver_data;
1784 unsigned long flags;
1785 struct specialix_board *bp;
1786
1787 func_enter();
1788
1789 if (sx_paranoia_check(port, tty->name, __func__)) {
1790 func_exit();
1791 return -ENODEV;
1792 }
1793
1794 bp = port_Board(port);
1795
1796 spin_lock_irqsave(&port->lock, flags);
1797 if (sx_crtscts(port->port.tty)) {
1798 if (set & TIOCM_RTS)
1799 port->MSVR |= MSVR_DTR;
1800 } else {
1801 if (set & TIOCM_DTR)
1802 port->MSVR |= MSVR_DTR;
1803 }
1804 if (sx_crtscts(port->port.tty)) {
1805 if (clear & TIOCM_RTS)
1806 port->MSVR &= ~MSVR_DTR;
1807 } else {
1808 if (clear & TIOCM_DTR)
1809 port->MSVR &= ~MSVR_DTR;
1810 }
1811 spin_lock_irqsave(&bp->lock, flags);
1812 sx_out(bp, CD186x_CAR, port_No(port));
1813 sx_out(bp, CD186x_MSVR, port->MSVR);
1814 spin_unlock_irqrestore(&bp->lock, flags);
1815 spin_unlock_irqrestore(&port->lock, flags);
1816 func_exit();
1817 return 0;
1818 }
1819
1820
sx_send_break(struct tty_struct * tty,int length)1821 static int sx_send_break(struct tty_struct *tty, int length)
1822 {
1823 struct specialix_port *port = tty->driver_data;
1824 struct specialix_board *bp = port_Board(port);
1825 unsigned long flags;
1826
1827 func_enter();
1828 if (length == 0 || length == -1)
1829 return -EOPNOTSUPP;
1830
1831 spin_lock_irqsave(&port->lock, flags);
1832 port->break_length = SPECIALIX_TPS / HZ * length;
1833 port->COR2 |= COR2_ETC;
1834 port->IER |= IER_TXRDY;
1835 spin_lock_irqsave(&bp->lock, flags);
1836 sx_out(bp, CD186x_CAR, port_No(port));
1837 sx_out(bp, CD186x_COR2, port->COR2);
1838 sx_out(bp, CD186x_IER, port->IER);
1839 spin_unlock_irqrestore(&bp->lock, flags);
1840 spin_unlock_irqrestore(&port->lock, flags);
1841 sx_wait_CCR(bp);
1842 spin_lock_irqsave(&bp->lock, flags);
1843 sx_out(bp, CD186x_CCR, CCR_CORCHG2);
1844 spin_unlock_irqrestore(&bp->lock, flags);
1845 sx_wait_CCR(bp);
1846
1847 func_exit();
1848 return 0;
1849 }
1850
1851
sx_set_serial_info(struct specialix_port * port,struct serial_struct __user * newinfo)1852 static int sx_set_serial_info(struct specialix_port *port,
1853 struct serial_struct __user *newinfo)
1854 {
1855 struct serial_struct tmp;
1856 struct specialix_board *bp = port_Board(port);
1857 int change_speed;
1858
1859 func_enter();
1860
1861 if (copy_from_user(&tmp, newinfo, sizeof(tmp))) {
1862 func_enter();
1863 return -EFAULT;
1864 }
1865
1866 lock_kernel();
1867
1868 change_speed = ((port->port.flags & ASYNC_SPD_MASK) !=
1869 (tmp.flags & ASYNC_SPD_MASK));
1870 change_speed |= (tmp.custom_divisor != port->custom_divisor);
1871
1872 if (!capable(CAP_SYS_ADMIN)) {
1873 if ((tmp.close_delay != port->port.close_delay) ||
1874 (tmp.closing_wait != port->port.closing_wait) ||
1875 ((tmp.flags & ~ASYNC_USR_MASK) !=
1876 (port->port.flags & ~ASYNC_USR_MASK))) {
1877 func_exit();
1878 unlock_kernel();
1879 return -EPERM;
1880 }
1881 port->port.flags = ((port->port.flags & ~ASYNC_USR_MASK) |
1882 (tmp.flags & ASYNC_USR_MASK));
1883 port->custom_divisor = tmp.custom_divisor;
1884 } else {
1885 port->port.flags = ((port->port.flags & ~ASYNC_FLAGS) |
1886 (tmp.flags & ASYNC_FLAGS));
1887 port->port.close_delay = tmp.close_delay;
1888 port->port.closing_wait = tmp.closing_wait;
1889 port->custom_divisor = tmp.custom_divisor;
1890 }
1891 if (change_speed)
1892 sx_change_speed(bp, port);
1893
1894 func_exit();
1895 unlock_kernel();
1896 return 0;
1897 }
1898
1899
sx_get_serial_info(struct specialix_port * port,struct serial_struct __user * retinfo)1900 static int sx_get_serial_info(struct specialix_port *port,
1901 struct serial_struct __user *retinfo)
1902 {
1903 struct serial_struct tmp;
1904 struct specialix_board *bp = port_Board(port);
1905
1906 func_enter();
1907
1908 memset(&tmp, 0, sizeof(tmp));
1909 lock_kernel();
1910 tmp.type = PORT_CIRRUS;
1911 tmp.line = port - sx_port;
1912 tmp.port = bp->base;
1913 tmp.irq = bp->irq;
1914 tmp.flags = port->port.flags;
1915 tmp.baud_base = (SX_OSCFREQ + CD186x_TPC/2) / CD186x_TPC;
1916 tmp.close_delay = port->port.close_delay * HZ/100;
1917 tmp.closing_wait = port->port.closing_wait * HZ/100;
1918 tmp.custom_divisor = port->custom_divisor;
1919 tmp.xmit_fifo_size = CD186x_NFIFO;
1920 unlock_kernel();
1921 if (copy_to_user(retinfo, &tmp, sizeof(tmp))) {
1922 func_exit();
1923 return -EFAULT;
1924 }
1925
1926 func_exit();
1927 return 0;
1928 }
1929
1930
sx_ioctl(struct tty_struct * tty,struct file * filp,unsigned int cmd,unsigned long arg)1931 static int sx_ioctl(struct tty_struct *tty, struct file *filp,
1932 unsigned int cmd, unsigned long arg)
1933 {
1934 struct specialix_port *port = tty->driver_data;
1935 void __user *argp = (void __user *)arg;
1936
1937 func_enter();
1938
1939 if (sx_paranoia_check(port, tty->name, "sx_ioctl")) {
1940 func_exit();
1941 return -ENODEV;
1942 }
1943
1944 switch (cmd) {
1945 case TIOCGSERIAL:
1946 func_exit();
1947 return sx_get_serial_info(port, argp);
1948 case TIOCSSERIAL:
1949 func_exit();
1950 return sx_set_serial_info(port, argp);
1951 default:
1952 func_exit();
1953 return -ENOIOCTLCMD;
1954 }
1955 func_exit();
1956 return 0;
1957 }
1958
1959
sx_throttle(struct tty_struct * tty)1960 static void sx_throttle(struct tty_struct *tty)
1961 {
1962 struct specialix_port *port = tty->driver_data;
1963 struct specialix_board *bp;
1964 unsigned long flags;
1965
1966 func_enter();
1967
1968 if (sx_paranoia_check(port, tty->name, "sx_throttle")) {
1969 func_exit();
1970 return;
1971 }
1972
1973 bp = port_Board(port);
1974
1975 /* Use DTR instead of RTS ! */
1976 if (sx_crtscts(tty))
1977 port->MSVR &= ~MSVR_DTR;
1978 else {
1979 /* Auch!!! I think the system shouldn't call this then. */
1980 /* Or maybe we're supposed (allowed?) to do our side of hw
1981 handshake anyway, even when hardware handshake is off.
1982 When you see this in your logs, please report.... */
1983 printk(KERN_ERR
1984 "sx%d: Need to throttle, but can't (hardware hs is off)\n",
1985 port_No(port));
1986 }
1987 spin_lock_irqsave(&bp->lock, flags);
1988 sx_out(bp, CD186x_CAR, port_No(port));
1989 spin_unlock_irqrestore(&bp->lock, flags);
1990 if (I_IXOFF(tty)) {
1991 sx_wait_CCR(bp);
1992 spin_lock_irqsave(&bp->lock, flags);
1993 sx_out(bp, CD186x_CCR, CCR_SSCH2);
1994 spin_unlock_irqrestore(&bp->lock, flags);
1995 sx_wait_CCR(bp);
1996 }
1997 spin_lock_irqsave(&bp->lock, flags);
1998 sx_out(bp, CD186x_MSVR, port->MSVR);
1999 spin_unlock_irqrestore(&bp->lock, flags);
2000
2001 func_exit();
2002 }
2003
2004
sx_unthrottle(struct tty_struct * tty)2005 static void sx_unthrottle(struct tty_struct *tty)
2006 {
2007 struct specialix_port *port = tty->driver_data;
2008 struct specialix_board *bp;
2009 unsigned long flags;
2010
2011 func_enter();
2012
2013 if (sx_paranoia_check(port, tty->name, "sx_unthrottle")) {
2014 func_exit();
2015 return;
2016 }
2017
2018 bp = port_Board(port);
2019
2020 spin_lock_irqsave(&port->lock, flags);
2021 /* XXXX Use DTR INSTEAD???? */
2022 if (sx_crtscts(tty))
2023 port->MSVR |= MSVR_DTR;
2024 /* Else clause: see remark in "sx_throttle"... */
2025 spin_lock_irqsave(&bp->lock, flags);
2026 sx_out(bp, CD186x_CAR, port_No(port));
2027 spin_unlock_irqrestore(&bp->lock, flags);
2028 if (I_IXOFF(tty)) {
2029 spin_unlock_irqrestore(&port->lock, flags);
2030 sx_wait_CCR(bp);
2031 spin_lock_irqsave(&bp->lock, flags);
2032 sx_out(bp, CD186x_CCR, CCR_SSCH1);
2033 spin_unlock_irqrestore(&bp->lock, flags);
2034 sx_wait_CCR(bp);
2035 spin_lock_irqsave(&port->lock, flags);
2036 }
2037 spin_lock_irqsave(&bp->lock, flags);
2038 sx_out(bp, CD186x_MSVR, port->MSVR);
2039 spin_unlock_irqrestore(&bp->lock, flags);
2040 spin_unlock_irqrestore(&port->lock, flags);
2041
2042 func_exit();
2043 }
2044
2045
sx_stop(struct tty_struct * tty)2046 static void sx_stop(struct tty_struct *tty)
2047 {
2048 struct specialix_port *port = tty->driver_data;
2049 struct specialix_board *bp;
2050 unsigned long flags;
2051
2052 func_enter();
2053
2054 if (sx_paranoia_check(port, tty->name, "sx_stop")) {
2055 func_exit();
2056 return;
2057 }
2058
2059 bp = port_Board(port);
2060
2061 spin_lock_irqsave(&port->lock, flags);
2062 port->IER &= ~IER_TXRDY;
2063 spin_lock_irqsave(&bp->lock, flags);
2064 sx_out(bp, CD186x_CAR, port_No(port));
2065 sx_out(bp, CD186x_IER, port->IER);
2066 spin_unlock_irqrestore(&bp->lock, flags);
2067 spin_unlock_irqrestore(&port->lock, flags);
2068
2069 func_exit();
2070 }
2071
2072
sx_start(struct tty_struct * tty)2073 static void sx_start(struct tty_struct *tty)
2074 {
2075 struct specialix_port *port = tty->driver_data;
2076 struct specialix_board *bp;
2077 unsigned long flags;
2078
2079 func_enter();
2080
2081 if (sx_paranoia_check(port, tty->name, "sx_start")) {
2082 func_exit();
2083 return;
2084 }
2085
2086 bp = port_Board(port);
2087
2088 spin_lock_irqsave(&port->lock, flags);
2089 if (port->xmit_cnt && port->xmit_buf && !(port->IER & IER_TXRDY)) {
2090 port->IER |= IER_TXRDY;
2091 spin_lock_irqsave(&bp->lock, flags);
2092 sx_out(bp, CD186x_CAR, port_No(port));
2093 sx_out(bp, CD186x_IER, port->IER);
2094 spin_unlock_irqrestore(&bp->lock, flags);
2095 }
2096 spin_unlock_irqrestore(&port->lock, flags);
2097
2098 func_exit();
2099 }
2100
sx_hangup(struct tty_struct * tty)2101 static void sx_hangup(struct tty_struct *tty)
2102 {
2103 struct specialix_port *port = tty->driver_data;
2104 struct specialix_board *bp;
2105 unsigned long flags;
2106
2107 func_enter();
2108
2109 if (sx_paranoia_check(port, tty->name, "sx_hangup")) {
2110 func_exit();
2111 return;
2112 }
2113
2114 bp = port_Board(port);
2115
2116 sx_shutdown_port(bp, port);
2117 spin_lock_irqsave(&port->lock, flags);
2118 bp->count -= port->port.count;
2119 if (bp->count < 0) {
2120 printk(KERN_ERR
2121 "sx%d: sx_hangup: bad board count: %d port: %d\n",
2122 board_No(bp), bp->count, tty->index);
2123 bp->count = 0;
2124 }
2125 port->port.count = 0;
2126 port->port.flags &= ~ASYNC_NORMAL_ACTIVE;
2127 port->port.tty = NULL;
2128 spin_unlock_irqrestore(&port->lock, flags);
2129 wake_up_interruptible(&port->port.open_wait);
2130
2131 func_exit();
2132 }
2133
2134
sx_set_termios(struct tty_struct * tty,struct ktermios * old_termios)2135 static void sx_set_termios(struct tty_struct *tty,
2136 struct ktermios *old_termios)
2137 {
2138 struct specialix_port *port = tty->driver_data;
2139 unsigned long flags;
2140 struct specialix_board *bp;
2141
2142 if (sx_paranoia_check(port, tty->name, "sx_set_termios"))
2143 return;
2144
2145 bp = port_Board(port);
2146 spin_lock_irqsave(&port->lock, flags);
2147 sx_change_speed(port_Board(port), port);
2148 spin_unlock_irqrestore(&port->lock, flags);
2149
2150 if ((old_termios->c_cflag & CRTSCTS) &&
2151 !(tty->termios->c_cflag & CRTSCTS)) {
2152 tty->hw_stopped = 0;
2153 sx_start(tty);
2154 }
2155 }
2156
2157 static const struct tty_operations sx_ops = {
2158 .open = sx_open,
2159 .close = sx_close,
2160 .write = sx_write,
2161 .put_char = sx_put_char,
2162 .flush_chars = sx_flush_chars,
2163 .write_room = sx_write_room,
2164 .chars_in_buffer = sx_chars_in_buffer,
2165 .flush_buffer = sx_flush_buffer,
2166 .ioctl = sx_ioctl,
2167 .throttle = sx_throttle,
2168 .unthrottle = sx_unthrottle,
2169 .set_termios = sx_set_termios,
2170 .stop = sx_stop,
2171 .start = sx_start,
2172 .hangup = sx_hangup,
2173 .tiocmget = sx_tiocmget,
2174 .tiocmset = sx_tiocmset,
2175 .break_ctl = sx_send_break,
2176 };
2177
sx_init_drivers(void)2178 static int sx_init_drivers(void)
2179 {
2180 int error;
2181 int i;
2182
2183 func_enter();
2184
2185 specialix_driver = alloc_tty_driver(SX_NBOARD * SX_NPORT);
2186 if (!specialix_driver) {
2187 printk(KERN_ERR "sx: Couldn't allocate tty_driver.\n");
2188 func_exit();
2189 return 1;
2190 }
2191
2192 specialix_driver->owner = THIS_MODULE;
2193 specialix_driver->name = "ttyW";
2194 specialix_driver->major = SPECIALIX_NORMAL_MAJOR;
2195 specialix_driver->type = TTY_DRIVER_TYPE_SERIAL;
2196 specialix_driver->subtype = SERIAL_TYPE_NORMAL;
2197 specialix_driver->init_termios = tty_std_termios;
2198 specialix_driver->init_termios.c_cflag =
2199 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
2200 specialix_driver->init_termios.c_ispeed = 9600;
2201 specialix_driver->init_termios.c_ospeed = 9600;
2202 specialix_driver->flags = TTY_DRIVER_REAL_RAW |
2203 TTY_DRIVER_HARDWARE_BREAK;
2204 tty_set_operations(specialix_driver, &sx_ops);
2205
2206 error = tty_register_driver(specialix_driver);
2207 if (error) {
2208 put_tty_driver(specialix_driver);
2209 printk(KERN_ERR
2210 "sx: Couldn't register specialix IO8+ driver, error = %d\n",
2211 error);
2212 func_exit();
2213 return 1;
2214 }
2215 memset(sx_port, 0, sizeof(sx_port));
2216 for (i = 0; i < SX_NPORT * SX_NBOARD; i++) {
2217 sx_port[i].magic = SPECIALIX_MAGIC;
2218 tty_port_init(&sx_port[i].port);
2219 spin_lock_init(&sx_port[i].lock);
2220 }
2221
2222 func_exit();
2223 return 0;
2224 }
2225
sx_release_drivers(void)2226 static void sx_release_drivers(void)
2227 {
2228 func_enter();
2229
2230 tty_unregister_driver(specialix_driver);
2231 put_tty_driver(specialix_driver);
2232 func_exit();
2233 }
2234
2235 /*
2236 * This routine must be called by kernel at boot time
2237 */
specialix_init(void)2238 static int __init specialix_init(void)
2239 {
2240 int i;
2241 int found = 0;
2242
2243 func_enter();
2244
2245 printk(KERN_INFO "sx: Specialix IO8+ driver v" VERSION ", (c) R.E.Wolff 1997/1998.\n");
2246 printk(KERN_INFO "sx: derived from work (c) D.Gorodchanin 1994-1996.\n");
2247 if (sx_rtscts)
2248 printk(KERN_INFO
2249 "sx: DTR/RTS pin is RTS when CRTSCTS is on.\n");
2250 else
2251 printk(KERN_INFO "sx: DTR/RTS pin is always RTS.\n");
2252
2253 for (i = 0; i < SX_NBOARD; i++)
2254 spin_lock_init(&sx_board[i].lock);
2255
2256 if (sx_init_drivers()) {
2257 func_exit();
2258 return -EIO;
2259 }
2260
2261 for (i = 0; i < SX_NBOARD; i++)
2262 if (sx_board[i].base && !sx_probe(&sx_board[i]))
2263 found++;
2264
2265 #ifdef CONFIG_PCI
2266 {
2267 struct pci_dev *pdev = NULL;
2268
2269 i = 0;
2270 while (i < SX_NBOARD) {
2271 if (sx_board[i].flags & SX_BOARD_PRESENT) {
2272 i++;
2273 continue;
2274 }
2275 pdev = pci_get_device(PCI_VENDOR_ID_SPECIALIX,
2276 PCI_DEVICE_ID_SPECIALIX_IO8, pdev);
2277 if (!pdev)
2278 break;
2279
2280 if (pci_enable_device(pdev))
2281 continue;
2282
2283 sx_board[i].irq = pdev->irq;
2284
2285 sx_board[i].base = pci_resource_start(pdev, 2);
2286
2287 sx_board[i].flags |= SX_BOARD_IS_PCI;
2288 if (!sx_probe(&sx_board[i]))
2289 found++;
2290 }
2291 /* May exit pci_get sequence early with lots of boards */
2292 if (pdev != NULL)
2293 pci_dev_put(pdev);
2294 }
2295 #endif
2296
2297 if (!found) {
2298 sx_release_drivers();
2299 printk(KERN_INFO "sx: No specialix IO8+ boards detected.\n");
2300 func_exit();
2301 return -EIO;
2302 }
2303
2304 func_exit();
2305 return 0;
2306 }
2307
2308 static int iobase[SX_NBOARD] = {0,};
2309 static int irq[SX_NBOARD] = {0,};
2310
2311 module_param_array(iobase, int, NULL, 0);
2312 module_param_array(irq, int, NULL, 0);
2313 module_param(sx_debug, int, 0);
2314 module_param(sx_rtscts, int, 0);
2315 module_param(sx_rxfifo, int, 0);
2316
2317 /*
2318 * You can setup up to 4 boards.
2319 * by specifying "iobase=0xXXX,0xXXX ..." as insmod parameter.
2320 * You should specify the IRQs too in that case "irq=....,...".
2321 *
2322 * More than 4 boards in one computer is not possible, as the card can
2323 * only use 4 different interrupts.
2324 *
2325 */
specialix_init_module(void)2326 static int __init specialix_init_module(void)
2327 {
2328 int i;
2329
2330 func_enter();
2331
2332 if (iobase[0] || iobase[1] || iobase[2] || iobase[3]) {
2333 for (i = 0; i < SX_NBOARD; i++) {
2334 sx_board[i].base = iobase[i];
2335 sx_board[i].irq = irq[i];
2336 sx_board[i].count = 0;
2337 }
2338 }
2339
2340 func_exit();
2341
2342 return specialix_init();
2343 }
2344
specialix_exit_module(void)2345 static void __exit specialix_exit_module(void)
2346 {
2347 int i;
2348
2349 func_enter();
2350
2351 sx_release_drivers();
2352 for (i = 0; i < SX_NBOARD; i++)
2353 if (sx_board[i].flags & SX_BOARD_PRESENT)
2354 sx_release_io_range(&sx_board[i]);
2355 func_exit();
2356 }
2357
2358 static struct pci_device_id specialx_pci_tbl[] __devinitdata = {
2359 { PCI_DEVICE(PCI_VENDOR_ID_SPECIALIX, PCI_DEVICE_ID_SPECIALIX_IO8) },
2360 { }
2361 };
2362 MODULE_DEVICE_TABLE(pci, specialx_pci_tbl);
2363
2364 module_init(specialix_init_module);
2365 module_exit(specialix_exit_module);
2366
2367 MODULE_LICENSE("GPL");
2368