com.c revision 1.16 1 /*-
2 * Copyright (c) 1991 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * from: @(#)com.c 7.5 (Berkeley) 5/16/91
34 * $Id: com.c,v 1.16 1994/01/30 16:41:27 ws Exp $
35 */
36
37 #include "com.h"
38 #if NCOM > 0
39 /*
40 * COM driver, based on HP dca driver
41 * uses National Semiconductor NS16450/NS16550AF UART
42 */
43 #include <sys/param.h>
44 #include <sys/systm.h>
45 #include <sys/ioctl.h>
46 #include <sys/select.h>
47 #include <sys/tty.h>
48 #include <sys/proc.h>
49 #include <sys/user.h>
50 #include <sys/conf.h>
51 #include <sys/file.h>
52 #include <sys/uio.h>
53 #include <sys/kernel.h>
54 #include <sys/syslog.h>
55 #include <sys/types.h>
56
57 #include <machine/pio.h>
58
59 #include <i386/isa/isa_device.h>
60 #include <i386/isa/comreg.h>
61 #include <i386/isa/ic/ns16550.h>
62
63 #define cominor(d)
64
65 int comprobe(), comattach(), comintr(), comparam();
66 void comstart();
67
68 struct isa_driver comdriver = {
69 comprobe, comattach, "com"
70 };
71
72 int comsoftCAR;
73 int com_active;
74 int com_hasfifo;
75 int ncom = NCOM;
76 #ifdef COMCONSOLE
77 int comconsole = COMCONSOLE;
78 #else
79 int comconsole = -1;
80 #endif
81 int comconsinit;
82 int comdefaultrate = TTYDEF_SPEED;
83 int commajor;
84 short com_addr[NCOM];
85 struct tty *com_tty[NCOM];
86
87 struct speedtab comspeedtab[] = {
88 0, 0,
89 50, COMBRD(50),
90 75, COMBRD(75),
91 110, COMBRD(110),
92 134, COMBRD(134),
93 150, COMBRD(150),
94 200, COMBRD(200),
95 300, COMBRD(300),
96 600, COMBRD(600),
97 1200, COMBRD(1200),
98 1800, COMBRD(1800),
99 2400, COMBRD(2400),
100 4800, COMBRD(4800),
101 9600, COMBRD(9600),
102 19200, COMBRD(19200),
103 38400, COMBRD(38400),
104 57600, COMBRD(57600),
105 -1, -1
106 };
107
108 extern struct tty *constty;
109 #ifdef KGDB
110 #include <machine/remote-sl.h>
111
112 extern int kgdb_dev;
113 extern int kgdb_rate;
114 extern int kgdb_debug_init;
115 #endif
116
117 #define UNIT(x) (minor(x))
118
119 comprobe(dev)
120 struct isa_device *dev;
121 {
122 /* force access to id reg */
123 outb(dev->id_iobase+com_cfcr, 0);
124 outb(dev->id_iobase+com_iir, 0);
125 DELAY(100);
126 if ((inb(dev->id_iobase+com_iir) & 0x38) == 0)
127 return(8);
128 return(0);
129 }
130
131
132 int
133 comattach(isdp)
134 struct isa_device *isdp;
135 {
136 struct tty *tp;
137 u_char unit;
138 int port = isdp->id_iobase;
139
140 unit = isdp->id_unit;
141 if (unit == comconsole)
142 DELAY(1000);
143 com_addr[unit] = port;
144 com_active |= 1 << unit;
145 comsoftCAR |= 1 << unit; /* XXX */
146
147 /* look for a NS 16550AF UART with FIFOs */
148 outb(port+com_fifo, FIFO_ENABLE|FIFO_RCV_RST|FIFO_XMT_RST|FIFO_TRIGGER_4);
149 DELAY(100);
150 if ((inb(port+com_iir) & IIR_FIFO_MASK) == IIR_FIFO_MASK) {
151 com_hasfifo |= 1 << unit;
152 printf("com%d: fifo\n", isdp->id_unit);
153 }
154
155 outb(port+com_ier, 0);
156 outb(port+com_mcr, 0 | MCR_IENABLE);
157 #ifdef KGDB
158 if (kgdb_dev == makedev(commajor, unit)) {
159 if (comconsole == unit)
160 kgdb_dev = -1; /* can't debug over console port */
161 else {
162 (void) cominit(unit, kgdb_rate);
163 if (kgdb_debug_init) {
164 /*
165 * Print prefix of device name,
166 * let kgdb_connect print the rest.
167 */
168 printf("com%d: ", unit);
169 kgdb_connect(1);
170 } else
171 printf("com%d: kgdb enabled\n", unit);
172 }
173 }
174 #endif
175 /*
176 * Need to reset baud rate, etc. of next print so reset comconsinit.
177 * Also make sure console is always "hardwired"
178 */
179 if (unit == comconsole) {
180 comconsinit = 0;
181 comsoftCAR |= (1 << unit);
182 }
183 return (1);
184 }
185
186 /* ARGSUSED */
187 comopen(dev_t dev, int flag, int mode, struct proc *p)
188 {
189 register struct tty *tp;
190 register int unit;
191 int error = 0;
192
193 unit = UNIT(dev);
194 if (unit >= NCOM || (com_active & (1 << unit)) == 0)
195 return (ENXIO);
196 if(!com_tty[unit]) {
197 tp = com_tty[unit] = ttymalloc();
198 } else
199 tp = com_tty[unit];
200 tp->t_oproc = comstart;
201 tp->t_param = comparam;
202 tp->t_dev = dev;
203 if ((tp->t_state & TS_ISOPEN) == 0) {
204 tp->t_state |= TS_WOPEN;
205 ttychars(tp);
206 tp->t_iflag = TTYDEF_IFLAG;
207 tp->t_oflag = TTYDEF_OFLAG;
208 tp->t_cflag = TTYDEF_CFLAG;
209 tp->t_lflag = TTYDEF_LFLAG;
210 tp->t_ispeed = tp->t_ospeed = comdefaultrate;
211 comparam(tp, &tp->t_termios);
212 ttsetwater(tp);
213 } else if (tp->t_state&TS_XCLUDE && p->p_ucred->cr_uid != 0)
214 return (EBUSY);
215 (void) spltty();
216 (void) commctl(dev, MCR_DTR | MCR_RTS, DMSET);
217 if ((comsoftCAR & (1 << unit)) || (commctl(dev, 0, DMGET) & MSR_DCD))
218 tp->t_state |= TS_CARR_ON;
219 while ((flag&O_NONBLOCK) == 0 && (tp->t_cflag&CLOCAL) == 0 &&
220 (tp->t_state & TS_CARR_ON) == 0) {
221 tp->t_state |= TS_WOPEN;
222 if (error = ttysleep(tp, (caddr_t)&tp->t_rawq, TTIPRI | PCATCH,
223 ttopen, 0))
224 break;
225 }
226 (void) spl0();
227 if (error == 0)
228 error = (*linesw[tp->t_line].l_open)(dev, tp);
229 return (error);
230 }
231
232 /*ARGSUSED*/
233 comclose(dev, flag, mode, p)
234 dev_t dev;
235 int flag, mode;
236 struct proc *p;
237 {
238 register struct tty *tp;
239 register com;
240 register int unit;
241
242 unit = UNIT(dev);
243 com = com_addr[unit];
244 tp = com_tty[unit];
245 (*linesw[tp->t_line].l_close)(tp, flag);
246 outb(com+com_cfcr, inb(com+com_cfcr) & ~CFCR_SBREAK);
247 #ifdef KGDB
248 /* do not disable interrupts if debugging */
249 if (kgdb_dev != makedev(commajor, unit))
250 #endif
251 outb(com+com_ier, 0);
252 if (tp->t_cflag&HUPCL || tp->t_state&TS_WOPEN ||
253 (tp->t_state&TS_ISOPEN) == 0)
254 (void) commctl(dev, 0, DMSET);
255 ttyclose(tp);
256 #ifdef broken /* session holds a ref to the tty; can't deallocate */
257 ttyfree(tp);
258 com_tty[unit] = (struct tty *)NULL;
259 #endif
260 return(0);
261 }
262
263 comread(dev, uio, flag)
264 dev_t dev;
265 struct uio *uio;
266 {
267 register struct tty *tp = com_tty[UNIT(dev)];
268
269 return ((*linesw[tp->t_line].l_read)(tp, uio, flag));
270 }
271
272 comwrite(dev, uio, flag)
273 dev_t dev;
274 struct uio *uio;
275 {
276 int unit = UNIT(dev);
277 register struct tty *tp = com_tty[unit];
278
279 /*
280 * (XXX) We disallow virtual consoles if the physical console is
281 * a serial port. This is in case there is a display attached that
282 * is not the console. In that situation we don't need/want the X
283 * server taking over the console.
284 */
285 if (constty && unit == comconsole)
286 constty = NULL;
287 return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
288 }
289
290 comintr(unit)
291 register int unit;
292 {
293 register com;
294 register u_char code;
295 register struct tty *tp;
296
297 com = com_addr[unit];
298 while (1) {
299 code = inb(com+com_iir);
300 switch (code & IIR_IMASK) {
301 case IIR_NOPEND:
302 return (1);
303 case IIR_RXTOUT:
304 case IIR_RXRDY:
305 tp = com_tty[unit];
306 /*
307 * Process received bytes. Inline for speed...
308 */
309 #ifdef KGDB
310 #define RCVBYTE() \
311 code = inb(com+com_data); \
312 if ((tp->t_state & TS_ISOPEN) == 0) { \
313 if (kgdb_dev == makedev(commajor, unit) && \
314 code == FRAME_END) \
315 kgdb_connect(0); /* trap into kgdb */ \
316 } else \
317 (*linesw[tp->t_line].l_rint)(code, tp)
318 #else
319 #define RCVBYTE() \
320 code = inb(com+com_data); \
321 if (tp->t_state & TS_ISOPEN) \
322 (*linesw[tp->t_line].l_rint)(code, tp)
323 #endif
324
325 RCVBYTE();
326
327 if (com_hasfifo & (1 << unit))
328 while ((code = inb(com+com_lsr)) & LSR_RCV_MASK) {
329 if (code == LSR_RXRDY) {
330 RCVBYTE();
331 } else
332 comeint(unit, code, com);
333 }
334 break;
335 case IIR_TXRDY:
336 tp = com_tty[unit];
337 tp->t_state &=~ (TS_BUSY|TS_FLUSH);
338 if (tp->t_line)
339 (*linesw[tp->t_line].l_start)(tp);
340 else
341 comstart(tp);
342 break;
343 case IIR_RLS:
344 comeint(unit, inb(com+com_lsr), com);
345 break;
346 default:
347 if (code & IIR_NOPEND)
348 return (1);
349 log(LOG_WARNING, "com%d: weird interrupt: 0x%x\n",
350 unit, code);
351 /* fall through */
352 case IIR_MLSC:
353 commint(unit, com);
354 break;
355 }
356 }
357 }
358
359 comeint(unit, stat, com)
360 register int unit, stat;
361 register com;
362 {
363 register struct tty *tp;
364 register int c;
365
366 tp = com_tty[unit];
367 c = inb(com+com_data);
368 if ((tp->t_state & TS_ISOPEN) == 0) {
369 #ifdef KGDB
370 /* we don't care about parity errors */
371 if (((stat & (LSR_BI|LSR_FE|LSR_PE)) == LSR_PE) &&
372 kgdb_dev == makedev(commajor, unit) && c == FRAME_END)
373 kgdb_connect(0); /* trap into kgdb */
374 #endif
375 return;
376 }
377 if (stat & (LSR_BI | LSR_FE))
378 c |= TTY_FE;
379 else if (stat & LSR_PE)
380 c |= TTY_PE;
381 else if (stat & LSR_OE) { /* 30 Aug 92*/
382 c |= TTY_PE; /* Ought to have it's own define... */
383 log(LOG_WARNING, "com%d: silo overflow\n", unit);
384 }
385 (*linesw[tp->t_line].l_rint)(c, tp);
386 }
387
388 commint(unit, com)
389 register int unit;
390 register com;
391 {
392 register struct tty *tp;
393 register int stat;
394
395 tp = com_tty[unit];
396 stat = inb(com+com_msr);
397 if ((stat & MSR_DDCD) && (comsoftCAR & (1 << unit)) == 0) {
398 if (stat & MSR_DCD)
399 (void)(*linesw[tp->t_line].l_modem)(tp, 1);
400 else if ((*linesw[tp->t_line].l_modem)(tp, 0) == 0)
401 outb(com+com_mcr,
402 inb(com+com_mcr) & ~(MCR_DTR | MCR_RTS) | MCR_IENABLE);
403 } else if ((stat & MSR_DCTS) && (tp->t_state & TS_ISOPEN) &&
404 (tp->t_flags & CRTSCTS)) {
405 /* the line is up and we want to do rts/cts flow control */
406 if (stat & MSR_CTS) {
407 tp->t_state &=~ TS_TTSTOP;
408 ttstart(tp);
409 } else
410 tp->t_state |= TS_TTSTOP;
411 }
412 }
413
414 comioctl(dev, cmd, data, flag)
415 dev_t dev;
416 caddr_t data;
417 {
418 register struct tty *tp;
419 register int unit = UNIT(dev);
420 register com;
421 register int error;
422
423 tp = com_tty[unit];
424 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag);
425 if (error >= 0)
426 return (error);
427 error = ttioctl(tp, cmd, data, flag);
428 if (error >= 0)
429 return (error);
430
431 com = com_addr[unit];
432 switch (cmd) {
433
434 case TIOCSBRK:
435 outb(com+com_cfcr, inb(com+com_cfcr) | CFCR_SBREAK);
436 break;
437
438 case TIOCCBRK:
439 outb(com+com_cfcr, inb(com+com_cfcr) & ~CFCR_SBREAK);
440 break;
441
442 case TIOCSDTR:
443 (void) commctl(dev, MCR_DTR | MCR_RTS, DMBIS);
444 break;
445
446 case TIOCCDTR:
447 (void) commctl(dev, MCR_DTR | MCR_RTS, DMBIC);
448 break;
449
450 case TIOCMSET:
451 (void) commctl(dev, *(int *)data, DMSET);
452 break;
453
454 case TIOCMBIS:
455 (void) commctl(dev, *(int *)data, DMBIS);
456 break;
457
458 case TIOCMBIC:
459 (void) commctl(dev, *(int *)data, DMBIC);
460 break;
461
462 case TIOCMGET:
463 *(int *)data = commctl(dev, 0, DMGET);
464 break;
465
466 default:
467 return (ENOTTY);
468 }
469 return (0);
470 }
471
472 comparam(tp, t)
473 register struct tty *tp;
474 register struct termios *t;
475 {
476 register com;
477 register int cfcr, cflag = t->c_cflag;
478 int unit = UNIT(tp->t_dev);
479 int ospeed = ttspeedtab(t->c_ospeed, comspeedtab);
480
481 /* check requested parameters */
482 if (ospeed < 0 || (t->c_ispeed && t->c_ispeed != t->c_ospeed))
483 return(EINVAL);
484 /* and copy to tty */
485 tp->t_ispeed = t->c_ispeed;
486 tp->t_ospeed = t->c_ospeed;
487 tp->t_cflag = cflag;
488
489 com = com_addr[unit];
490 outb(com+com_ier, IER_ERXRDY | IER_ETXRDY | IER_ERLS /*| IER_EMSC*/);
491 if (ospeed == 0) {
492 (void) commctl(unit, 0, DMSET); /* hang up line */
493 return(0);
494 }
495 outb(com+com_cfcr, inb(com+com_cfcr) | CFCR_DLAB);
496 outb(com+com_data, ospeed & 0xFF);
497 outb(com+com_ier, ospeed >> 8);
498 switch (cflag&CSIZE) {
499 case CS5:
500 cfcr = CFCR_5BITS; break;
501 case CS6:
502 cfcr = CFCR_6BITS; break;
503 case CS7:
504 cfcr = CFCR_7BITS; break;
505 case CS8:
506 cfcr = CFCR_8BITS; break;
507 }
508 if (cflag&PARENB) {
509 cfcr |= CFCR_PENAB;
510 if ((cflag&PARODD) == 0)
511 cfcr |= CFCR_PEVEN;
512 }
513 if (cflag&CSTOPB)
514 cfcr |= CFCR_STOPB;
515 outb(com+com_cfcr, cfcr);
516
517 if (com_hasfifo & (1 << unit))
518 outb(com+com_fifo, FIFO_ENABLE | FIFO_TRIGGER_4);
519
520 return(0);
521 }
522
523 void
524 comstart(tp)
525 register struct tty *tp;
526 {
527 register com;
528 int s, unit, c;
529
530 unit = UNIT(tp->t_dev);
531 com = com_addr[unit];
532 s = spltty();
533 if (tp->t_state & (TS_TIMEOUT|TS_TTSTOP))
534 goto out;
535 if (tp->t_outq.c_cc <= tp->t_lowat) {
536 if (tp->t_state&TS_ASLEEP) {
537 tp->t_state &= ~TS_ASLEEP;
538 wakeup((caddr_t)&tp->t_outq);
539 }
540 selwakeup(&tp->t_wsel);
541 }
542 if (tp->t_outq.c_cc == 0)
543 goto out;
544 if (inb(com+com_lsr) & LSR_TXRDY) {
545 c = getc(&tp->t_outq);
546 tp->t_state |= TS_BUSY;
547 outb(com+com_data, c);
548 if (com_hasfifo & (1 << unit))
549 for (c = 1; c < 16 && tp->t_outq.c_cc; ++c)
550 outb(com+com_data, getc(&tp->t_outq));
551 }
552 out:
553 splx(s);
554 }
555
556 /*
557 * Stop output on a line.
558 */
559 /*ARGSUSED*/
560 comstop(tp, flag)
561 register struct tty *tp;
562 {
563 register int s;
564
565 s = spltty();
566 if (tp->t_state & TS_BUSY) {
567 if ((tp->t_state&TS_TTSTOP)==0)
568 tp->t_state |= TS_FLUSH;
569 }
570 splx(s);
571 }
572
573 commctl(dev, bits, how)
574 dev_t dev;
575 int bits, how;
576 {
577 register com;
578 register int unit;
579 int s;
580
581 unit = UNIT(dev);
582 com = com_addr[unit];
583 s = spltty();
584 switch (how) {
585
586 case DMSET:
587 outb(com+com_mcr, bits | MCR_IENABLE);
588 break;
589
590 case DMBIS:
591 outb(com+com_mcr, inb(com+com_mcr) | bits | MCR_IENABLE);
592 break;
593
594 case DMBIC:
595 outb(com+com_mcr, inb(com+com_mcr) & ~bits | MCR_IENABLE);
596 break;
597
598 case DMGET:
599 bits = inb(com+com_msr);
600 break;
601 }
602 (void) splx(s);
603 return(bits);
604 }
605
606 /*
607 * Following are all routines needed for COM to act as console
608 */
609 #include <i386/i386/cons.h>
610
611 comcnprobe(cp)
612 struct consdev *cp;
613 {
614 int unit;
615
616 /* locate the major number */
617 for (commajor = 0; commajor < nchrdev; commajor++)
618 if (cdevsw[commajor].d_open == comopen)
619 break;
620
621 /* XXX: ick */
622 unit = CONUNIT;
623 com_addr[CONUNIT] = CONADDR;
624
625 /* make sure hardware exists? XXX */
626
627 /* initialize required fields */
628 cp->cn_dev = makedev(commajor, unit);
629 #ifdef COMCONSOLE
630 cp->cn_pri = CN_REMOTE; /* Force a serial port console */
631 #else
632 cp->cn_pri = CN_NORMAL;
633 #endif
634 }
635
636 comcninit(cp)
637 struct consdev *cp;
638 {
639 int unit = UNIT(cp->cn_dev);
640
641 cominit(unit, comdefaultrate);
642 comconsole = unit;
643 comconsinit = 1;
644 }
645
646 cominit(unit, rate)
647 int unit, rate;
648 {
649 register int com;
650 int s;
651 short stat;
652
653 #ifdef lint
654 stat = unit; if (stat) return;
655 #endif
656 com = com_addr[unit];
657 s = splhigh();
658 outb(com+com_cfcr, CFCR_DLAB);
659 rate = ttspeedtab(comdefaultrate, comspeedtab);
660 outb(com+com_data, rate & 0xFF);
661 outb(com+com_ier, rate >> 8);
662 outb(com+com_cfcr, CFCR_8BITS);
663 outb(com+com_ier, IER_ERXRDY | IER_ETXRDY);
664 outb(com+com_fifo, FIFO_ENABLE|FIFO_RCV_RST|FIFO_XMT_RST|FIFO_TRIGGER_4);
665 stat = inb(com+com_iir);
666 splx(s);
667 }
668
669 comcngetc(dev)
670 {
671 register com = com_addr[UNIT(dev)];
672 short stat;
673 int c, s;
674
675 #ifdef lint
676 stat = dev; if (stat) return(0);
677 #endif
678 s = splhigh();
679 while (((stat = inb(com+com_lsr)) & LSR_RXRDY) == 0)
680 ;
681 c = inb(com+com_data);
682 stat = inb(com+com_iir);
683 splx(s);
684 return(c);
685 }
686
687 /*
688 * Console kernel output character routine.
689 */
690 comcnputc(dev, c)
691 dev_t dev;
692 register int c;
693 {
694 register com = com_addr[UNIT(dev)];
695 register int timo;
696 short stat;
697 int s = splhigh();
698
699 #ifdef lint
700 stat = dev; if (stat) return;
701 #endif
702 #ifdef KGDB
703 if (dev != kgdb_dev)
704 #endif
705 if (comconsinit == 0) {
706 (void) cominit(UNIT(dev), comdefaultrate);
707 comconsinit = 1;
708 }
709 /* wait for any pending transmission to finish */
710 timo = 50000;
711 while (((stat = inb(com+com_lsr)) & LSR_TXRDY) == 0 && --timo)
712 ;
713 outb(com+com_data, c);
714 /* wait for this transmission to complete */
715 timo = 1500000;
716 while (((stat = inb(com+com_lsr)) & LSR_TXRDY) == 0 && --timo)
717 ;
718 /* clear any interrupts generated by this transmission */
719 stat = inb(com+com_iir);
720 splx(s);
721 }
722
723 #endif
724