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 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * from: @(#)com.c 7.5 (Berkeley) 5/16/91
30 * from: i386/isa sio.c,v 1.234
31 */
32
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
35
36 #include "opt_compat.h"
37 #include "opt_gdb.h"
38 #include "opt_kdb.h"
39 #include "opt_sio.h"
40
41 /*
42 * Serial driver, based on 386BSD-0.1 com driver.
43 * Mostly rewritten to use pseudo-DMA.
44 * Works for National Semiconductor NS8250-NS16550AF UARTs.
45 * COM driver, based on HP dca driver.
46 *
47 * Changes for PC Card integration:
48 * - Added PC Card driver table and handlers
49 */
50 #include <sys/param.h>
51 #include <sys/systm.h>
52 #include <sys/bus.h>
53 #include <sys/conf.h>
54 #include <sys/fcntl.h>
55 #include <sys/interrupt.h>
56 #include <sys/kdb.h>
57 #include <sys/kernel.h>
58 #include <sys/limits.h>
59 #include <sys/lock.h>
60 #include <sys/malloc.h>
61 #include <sys/module.h>
62 #include <sys/mutex.h>
63 #include <sys/proc.h>
64 #include <sys/reboot.h>
65 #include <sys/serial.h>
66 #include <sys/sysctl.h>
67 #include <sys/syslog.h>
68 #include <sys/tty.h>
69 #include <machine/bus.h>
70 #include <sys/rman.h>
71 #include <sys/timepps.h>
72 #include <sys/uio.h>
73 #include <sys/cons.h>
74
75 #include <isa/isavar.h>
76
77 #include <machine/resource.h>
78
79 #include <dev/sio/sioreg.h>
80 #include <dev/sio/siovar.h>
81
82 #ifdef COM_ESP
83 #include <dev/ic/esp.h>
84 #endif
85 #include <dev/ic/ns16550.h>
86
87 #define LOTS_OF_EVENTS 64 /* helps separate urgent events from input */
88
89 #ifdef COM_MULTIPORT
90 /* checks in flags for multiport and which is multiport "master chip"
91 * for a given card
92 */
93 #define COM_ISMULTIPORT(flags) ((flags) & 0x01)
94 #define COM_MPMASTER(flags) (((flags) >> 8) & 0x0ff)
95 #define COM_NOTAST4(flags) ((flags) & 0x04)
96 #else
97 #define COM_ISMULTIPORT(flags) (0)
98 #endif /* COM_MULTIPORT */
99
100 #define COM_C_IIR_TXRDYBUG 0x80000
101 #define COM_CONSOLE(flags) ((flags) & 0x10)
102 #define COM_DEBUGGER(flags) ((flags) & 0x80)
103 #define COM_FIFOSIZE(flags) (((flags) & 0xff000000) >> 24)
104 #define COM_FORCECONSOLE(flags) ((flags) & 0x20)
105 #define COM_IIR_TXRDYBUG(flags) ((flags) & COM_C_IIR_TXRDYBUG)
106 #define COM_LLCONSOLE(flags) ((flags) & 0x40)
107 #define COM_LOSESOUTINTS(flags) ((flags) & 0x08)
108 #define COM_NOFIFO(flags) ((flags) & 0x02)
109 #define COM_NOPROBE(flags) ((flags) & 0x40000)
110 #define COM_NOSCR(flags) ((flags) & 0x100000)
111 #define COM_PPSCTS(flags) ((flags) & 0x10000)
112 #define COM_ST16650A(flags) ((flags) & 0x20000)
113 #define COM_TI16754(flags) ((flags) & 0x200000)
114
115 #define sio_getreg(com, off) \
116 (bus_space_read_1((com)->bst, (com)->bsh, (off)))
117 #define sio_setreg(com, off, value) \
118 (bus_space_write_1((com)->bst, (com)->bsh, (off), (value)))
119
120 /*
121 * com state bits.
122 * (CS_BUSY | CS_TTGO) and (CS_BUSY | CS_TTGO | CS_ODEVREADY) must be higher
123 * than the other bits so that they can be tested as a group without masking
124 * off the low bits.
125 *
126 * The following com and tty flags correspond closely:
127 * CS_BUSY = TS_BUSY (maintained by comstart(), siopoll() and
128 * comstop())
129 * CS_TTGO = ~TS_TTSTOP (maintained by comparam() and comstart())
130 * CS_CTS_OFLOW = CCTS_OFLOW (maintained by comparam())
131 * CS_RTS_IFLOW = CRTS_IFLOW (maintained by comparam())
132 * TS_FLUSH is not used.
133 * XXX I think TIOCSETA doesn't clear TS_TTSTOP when it clears IXON.
134 * XXX CS_*FLOW should be CF_*FLOW in com->flags (control flags not state).
135 */
136 #define CS_BUSY 0x80 /* output in progress */
137 #define CS_TTGO 0x40 /* output not stopped by XOFF */
138 #define CS_ODEVREADY 0x20 /* external device h/w ready (CTS) */
139 #define CS_CHECKMSR 1 /* check of MSR scheduled */
140 #define CS_CTS_OFLOW 2 /* use CTS output flow control */
141 #define CS_ODONE 4 /* output completed */
142 #define CS_RTS_IFLOW 8 /* use RTS input flow control */
143 #define CSE_BUSYCHECK 1 /* siobusycheck() scheduled */
144
145 static char const * const error_desc[] = {
146 #define CE_OVERRUN 0
147 "silo overflow",
148 #define CE_INTERRUPT_BUF_OVERFLOW 1
149 "interrupt-level buffer overflow",
150 #define CE_TTY_BUF_OVERFLOW 2
151 "tty-level buffer overflow",
152 };
153
154 #define CE_NTYPES 3
155 #define CE_RECORD(com, errnum) (++(com)->delta_error_counts[errnum])
156
157 /* types. XXX - should be elsewhere */
158 typedef u_int Port_t; /* hardware port */
159 typedef u_char bool_t; /* boolean */
160
161 /* queue of linear buffers */
162 struct lbq {
163 u_char *l_head; /* next char to process */
164 u_char *l_tail; /* one past the last char to process */
165 struct lbq *l_next; /* next in queue */
166 bool_t l_queued; /* nonzero if queued */
167 };
168
169 /* com device structure */
170 struct com_s {
171 u_char state; /* miscellaneous flag bits */
172 u_char cfcr_image; /* copy of value written to CFCR */
173 #ifdef COM_ESP
174 bool_t esp; /* is this unit a hayes esp board? */
175 #endif
176 u_char extra_state; /* more flag bits, separate for order trick */
177 u_char fifo_image; /* copy of value written to FIFO */
178 bool_t hasfifo; /* nonzero for 16550 UARTs */
179 bool_t loses_outints; /* nonzero if device loses output interrupts */
180 u_char mcr_image; /* copy of value written to MCR */
181 #ifdef COM_MULTIPORT
182 bool_t multiport; /* is this unit part of a multiport device? */
183 #endif /* COM_MULTIPORT */
184 bool_t no_irq; /* nonzero if irq is not attached */
185 bool_t gone; /* hardware disappeared */
186 bool_t poll; /* nonzero if polling is required */
187 bool_t poll_output; /* nonzero if polling for output is required */
188 bool_t st16650a; /* nonzero if Startech 16650A compatible */
189 int unit; /* unit number */
190 u_int flags; /* copy of device flags */
191 u_int tx_fifo_size;
192
193 /*
194 * The high level of the driver never reads status registers directly
195 * because there would be too many side effects to handle conveniently.
196 * Instead, it reads copies of the registers stored here by the
197 * interrupt handler.
198 */
199 u_char last_modem_status; /* last MSR read by intr handler */
200 u_char prev_modem_status; /* last MSR handled by high level */
201
202 u_char *ibuf; /* start of input buffer */
203 u_char *ibufend; /* end of input buffer */
204 u_char *ibufold; /* old input buffer, to be freed */
205 u_char *ihighwater; /* threshold in input buffer */
206 u_char *iptr; /* next free spot in input buffer */
207 int ibufsize; /* size of ibuf (not include error bytes) */
208 int ierroff; /* offset of error bytes in ibuf */
209
210 struct lbq obufq; /* head of queue of output buffers */
211 struct lbq obufs[2]; /* output buffers */
212
213 bus_space_tag_t bst;
214 bus_space_handle_t bsh;
215
216 Port_t data_port; /* i/o ports */
217 #ifdef COM_ESP
218 Port_t esp_port;
219 #endif
220 Port_t int_ctl_port;
221 Port_t int_id_port;
222 Port_t modem_ctl_port;
223 Port_t line_status_port;
224 Port_t modem_status_port;
225
226 struct tty *tp; /* cross reference */
227
228 struct pps_state pps;
229 int pps_bit;
230 #ifdef KDB
231 int alt_brk_state;
232 #endif
233
234 u_long bytes_in; /* statistics */
235 u_long bytes_out;
236 u_int delta_error_counts[CE_NTYPES];
237 u_long error_counts[CE_NTYPES];
238
239 u_long rclk;
240
241 struct resource *irqres;
242 struct resource *ioportres;
243 int ioportrid;
244 void *cookie;
245
246 /*
247 * Data area for output buffers. Someday we should build the output
248 * buffer queue without copying data.
249 */
250 u_char obuf1[256];
251 u_char obuf2[256];
252 };
253
254 #ifdef COM_ESP
255 static int espattach(struct com_s *com, Port_t esp_port);
256 #endif
257
258 static void combreak(struct tty *tp, int sig);
259 static timeout_t siobusycheck;
260 static u_int siodivisor(u_long rclk, speed_t speed);
261 static void comclose(struct tty *tp);
262 static int comopen(struct tty *tp, struct cdev *dev);
263 static void sioinput(struct com_s *com);
264 static void siointr1(struct com_s *com);
265 static int siointr(void *arg);
266 static int commodem(struct tty *tp, int sigon, int sigoff);
267 static int comparam(struct tty *tp, struct termios *t);
268 static void siopoll(void *);
269 static void siosettimeout(void);
270 static int siosetwater(struct com_s *com, speed_t speed);
271 static void comstart(struct tty *tp);
272 static void comstop(struct tty *tp, int rw);
273 static timeout_t comwakeup;
274
275 char sio_driver_name[] = "sio";
276 static struct mtx sio_lock;
277 static int sio_inited;
278
279 /* table and macro for fast conversion from a unit number to its com struct */
280 devclass_t sio_devclass;
281 /*
282 * XXX Assmues that devclass_get_device, devclass_get_softc and
283 * device_get_softc are fast interrupt safe. The current implementation
284 * of these functions are.
285 */
286 #define com_addr(unit) ((struct com_s *) \
287 devclass_get_softc(sio_devclass, unit)) /* XXX */
288
289 int comconsole = -1;
290 static volatile speed_t comdefaultrate = CONSPEED;
291 static u_long comdefaultrclk = DEFAULT_RCLK;
292 SYSCTL_ULONG(_machdep, OID_AUTO, conrclk, CTLFLAG_RW, &comdefaultrclk, 0, "");
293 static speed_t gdbdefaultrate = GDBSPEED;
294 SYSCTL_UINT(_machdep, OID_AUTO, gdbspeed, CTLFLAG_RW,
295 &gdbdefaultrate, GDBSPEED, "");
296 static u_int com_events; /* input chars + weighted output completions */
297 static Port_t siocniobase;
298 static int siocnunit = -1;
299 static void *sio_slow_ih;
300 static void *sio_fast_ih;
301 static int sio_timeout;
302 static int sio_timeouts_until_log;
303 static struct callout_handle sio_timeout_handle
304 = CALLOUT_HANDLE_INITIALIZER(&sio_timeout_handle);
305 static int sio_numunits;
306
307 #ifdef GDB
308 static Port_t siogdbiobase = 0;
309 #endif
310
311 #ifdef COM_ESP
312 /* XXX configure this properly. */
313 /* XXX quite broken for new-bus. */
314 static Port_t likely_com_ports[] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8, };
315 static Port_t likely_esp_ports[] = { 0x140, 0x180, 0x280, 0 };
316 #endif
317
318 /*
319 * handle sysctl read/write requests for console speed
320 *
321 * In addition to setting comdefaultrate for I/O through /dev/console,
322 * also set the initial and lock values for the /dev/ttyXX device
323 * if there is one associated with the console. Finally, if the /dev/tty
324 * device has already been open, change the speed on the open running port
325 * itself.
326 */
327
328 static int
sysctl_machdep_comdefaultrate(SYSCTL_HANDLER_ARGS)329 sysctl_machdep_comdefaultrate(SYSCTL_HANDLER_ARGS)
330 {
331 int error, s;
332 speed_t newspeed;
333 struct com_s *com;
334 struct tty *tp;
335
336 newspeed = comdefaultrate;
337
338 error = sysctl_handle_opaque(oidp, &newspeed, sizeof newspeed, req);
339 if (error || !req->newptr)
340 return (error);
341
342 comdefaultrate = newspeed;
343
344 if (comconsole < 0) /* serial console not selected? */
345 return (0);
346
347 com = com_addr(comconsole);
348 if (com == NULL)
349 return (ENXIO);
350
351 tp = com->tp;
352 if (tp == NULL)
353 return (ENXIO);
354
355 /*
356 * set the initial and lock rates for /dev/ttydXX and /dev/cuaXX
357 * (note, the lock rates really are boolean -- if non-zero, disallow
358 * speed changes)
359 */
360 tp->t_init_in.c_ispeed = tp->t_init_in.c_ospeed =
361 tp->t_lock_in.c_ispeed = tp->t_lock_in.c_ospeed =
362 tp->t_init_out.c_ispeed = tp->t_init_out.c_ospeed =
363 tp->t_lock_out.c_ispeed = tp->t_lock_out.c_ospeed = comdefaultrate;
364
365 if (tp->t_state & TS_ISOPEN) {
366 tp->t_termios.c_ispeed =
367 tp->t_termios.c_ospeed = comdefaultrate;
368 s = spltty();
369 error = comparam(tp, &tp->t_termios);
370 splx(s);
371 }
372 return error;
373 }
374
375 SYSCTL_PROC(_machdep, OID_AUTO, conspeed, CTLTYPE_INT | CTLFLAG_RWTUN | CTLFLAG_NOFETCH,
376 0, 0, sysctl_machdep_comdefaultrate, "I", "");
377 TUNABLE_INT("machdep.conspeed", __DEVOLATILE(int *, &comdefaultrate));
378
379 #define SET_FLAG(dev, bit) device_set_flags(dev, device_get_flags(dev) | (bit))
380 #define CLR_FLAG(dev, bit) device_set_flags(dev, device_get_flags(dev) & ~(bit))
381
382 /*
383 * Unload the driver and clear the table.
384 * XXX this is mostly wrong.
385 * XXX TODO:
386 * This is usually called when the card is ejected, but
387 * can be caused by a kldunload of a controller driver.
388 * The idea is to reset the driver's view of the device
389 * and ensure that any driver entry points such as
390 * read and write do not hang.
391 */
392 int
siodetach(device_t dev)393 siodetach(device_t dev)
394 {
395 struct com_s *com;
396
397 com = (struct com_s *) device_get_softc(dev);
398 if (com == NULL) {
399 device_printf(dev, "NULL com in siounload\n");
400 return (0);
401 }
402 com->gone = TRUE;
403 if (com->tp)
404 ttyfree(com->tp);
405 if (com->irqres) {
406 bus_teardown_intr(dev, com->irqres, com->cookie);
407 bus_release_resource(dev, SYS_RES_IRQ, 0, com->irqres);
408 }
409 if (com->ioportres)
410 bus_release_resource(dev, SYS_RES_IOPORT, com->ioportrid,
411 com->ioportres);
412 if (com->ibuf != NULL)
413 free(com->ibuf, M_DEVBUF);
414
415 device_set_softc(dev, NULL);
416 free(com, M_DEVBUF);
417 return (0);
418 }
419
420 int
sioprobe(dev,xrid,rclk,noprobe)421 sioprobe(dev, xrid, rclk, noprobe)
422 device_t dev;
423 int xrid;
424 u_long rclk;
425 int noprobe;
426 {
427 #if 0
428 static bool_t already_init;
429 device_t xdev;
430 #endif
431 struct com_s *com;
432 u_int divisor;
433 bool_t failures[10];
434 int fn;
435 device_t idev;
436 Port_t iobase;
437 intrmask_t irqmap[4];
438 intrmask_t irqs;
439 u_char mcr_image;
440 int result;
441 u_long xirq;
442 u_int flags = device_get_flags(dev);
443 int rid;
444 struct resource *port;
445
446 rid = xrid;
447 port = bus_alloc_resource_anywhere(dev, SYS_RES_IOPORT, &rid,
448 IO_COMSIZE, RF_ACTIVE);
449 if (!port)
450 return (ENXIO);
451
452 com = malloc(sizeof(*com), M_DEVBUF, M_NOWAIT | M_ZERO);
453 if (com == NULL) {
454 bus_release_resource(dev, SYS_RES_IOPORT, rid, port);
455 return (ENOMEM);
456 }
457 device_set_softc(dev, com);
458 com->bst = rman_get_bustag(port);
459 com->bsh = rman_get_bushandle(port);
460 if (rclk == 0)
461 rclk = DEFAULT_RCLK;
462 com->rclk = rclk;
463
464 while (sio_inited != 2)
465 if (atomic_cmpset_int(&sio_inited, 0, 1)) {
466 mtx_init(&sio_lock, sio_driver_name, NULL,
467 (comconsole != -1) ?
468 MTX_SPIN | MTX_QUIET : MTX_SPIN);
469 atomic_store_rel_int(&sio_inited, 2);
470 }
471
472 #if 0
473 /*
474 * XXX this is broken - when we are first called, there are no
475 * previously configured IO ports. We could hard code
476 * 0x3f8, 0x2f8, 0x3e8, 0x2e8 etc but that's probably worse.
477 * This code has been doing nothing since the conversion since
478 * "count" is zero the first time around.
479 */
480 if (!already_init) {
481 /*
482 * Turn off MCR_IENABLE for all likely serial ports. An unused
483 * port with its MCR_IENABLE gate open will inhibit interrupts
484 * from any used port that shares the interrupt vector.
485 * XXX the gate enable is elsewhere for some multiports.
486 */
487 device_t *devs;
488 int count, i, xioport;
489
490 devclass_get_devices(sio_devclass, &devs, &count);
491 for (i = 0; i < count; i++) {
492 xdev = devs[i];
493 if (device_is_enabled(xdev) &&
494 bus_get_resource(xdev, SYS_RES_IOPORT, 0, &xioport,
495 NULL) == 0)
496 outb(xioport + com_mcr, 0);
497 }
498 free(devs, M_TEMP);
499 already_init = TRUE;
500 }
501 #endif
502
503 if (COM_LLCONSOLE(flags)) {
504 printf("sio%d: reserved for low-level i/o\n",
505 device_get_unit(dev));
506 bus_release_resource(dev, SYS_RES_IOPORT, rid, port);
507 device_set_softc(dev, NULL);
508 free(com, M_DEVBUF);
509 return (ENXIO);
510 }
511
512 /*
513 * If the device is on a multiport card and has an AST/4
514 * compatible interrupt control register, initialize this
515 * register and prepare to leave MCR_IENABLE clear in the mcr.
516 * Otherwise, prepare to set MCR_IENABLE in the mcr.
517 * Point idev to the device struct giving the correct id_irq.
518 * This is the struct for the master device if there is one.
519 */
520 idev = dev;
521 mcr_image = MCR_IENABLE;
522 #ifdef COM_MULTIPORT
523 if (COM_ISMULTIPORT(flags)) {
524 Port_t xiobase;
525 u_long io;
526
527 idev = devclass_get_device(sio_devclass, COM_MPMASTER(flags));
528 if (idev == NULL) {
529 printf("sio%d: master device %d not configured\n",
530 device_get_unit(dev), COM_MPMASTER(flags));
531 idev = dev;
532 }
533 if (!COM_NOTAST4(flags)) {
534 if (bus_get_resource(idev, SYS_RES_IOPORT, 0, &io,
535 NULL) == 0) {
536 xiobase = io;
537 if (bus_get_resource(idev, SYS_RES_IRQ, 0,
538 NULL, NULL) == 0)
539 outb(xiobase + com_scr, 0x80);
540 else
541 outb(xiobase + com_scr, 0);
542 }
543 mcr_image = 0;
544 }
545 }
546 #endif /* COM_MULTIPORT */
547 if (bus_get_resource(idev, SYS_RES_IRQ, 0, NULL, NULL) != 0)
548 mcr_image = 0;
549
550 bzero(failures, sizeof failures);
551 iobase = rman_get_start(port);
552
553 /*
554 * We don't want to get actual interrupts, just masked ones.
555 * Interrupts from this line should already be masked in the ICU,
556 * but mask them in the processor as well in case there are some
557 * (misconfigured) shared interrupts.
558 */
559 mtx_lock_spin(&sio_lock);
560 /* EXTRA DELAY? */
561
562 /*
563 * For the TI16754 chips, set prescaler to 1 (4 is often the
564 * default after-reset value) as otherwise it's impossible to
565 * get highest baudrates.
566 */
567 if (COM_TI16754(flags)) {
568 u_char cfcr, efr;
569
570 cfcr = sio_getreg(com, com_cfcr);
571 sio_setreg(com, com_cfcr, CFCR_EFR_ENABLE);
572 efr = sio_getreg(com, com_efr);
573 /* Unlock extended features to turn off prescaler. */
574 sio_setreg(com, com_efr, efr | EFR_EFE);
575 /* Disable EFR. */
576 sio_setreg(com, com_cfcr, (cfcr != CFCR_EFR_ENABLE) ? cfcr : 0);
577 /* Turn off prescaler. */
578 sio_setreg(com, com_mcr,
579 sio_getreg(com, com_mcr) & ~MCR_PRESCALE);
580 sio_setreg(com, com_cfcr, CFCR_EFR_ENABLE);
581 sio_setreg(com, com_efr, efr);
582 sio_setreg(com, com_cfcr, cfcr);
583 }
584
585 /*
586 * Initialize the speed and the word size and wait long enough to
587 * drain the maximum of 16 bytes of junk in device output queues.
588 * The speed is undefined after a master reset and must be set
589 * before relying on anything related to output. There may be
590 * junk after a (very fast) soft reboot and (apparently) after
591 * master reset.
592 * XXX what about the UART bug avoided by waiting in comparam()?
593 * We don't want to wait long enough to drain at 2 bps.
594 */
595 if (iobase == siocniobase)
596 DELAY((16 + 1) * 1000000 / (comdefaultrate / 10));
597 else {
598 sio_setreg(com, com_cfcr, CFCR_DLAB | CFCR_8BITS);
599 divisor = siodivisor(rclk, SIO_TEST_SPEED);
600 sio_setreg(com, com_dlbl, divisor & 0xff);
601 sio_setreg(com, com_dlbh, divisor >> 8);
602 sio_setreg(com, com_cfcr, CFCR_8BITS);
603 DELAY((16 + 1) * 1000000 / (SIO_TEST_SPEED / 10));
604 }
605
606 /*
607 * Enable the interrupt gate and disable device interrupts. This
608 * should leave the device driving the interrupt line low and
609 * guarantee an edge trigger if an interrupt can be generated.
610 */
611 /* EXTRA DELAY? */
612 sio_setreg(com, com_mcr, mcr_image);
613 sio_setreg(com, com_ier, 0);
614 DELAY(1000); /* XXX */
615 irqmap[0] = isa_irq_pending();
616
617 /*
618 * Attempt to set loopback mode so that we can send a null byte
619 * without annoying any external device.
620 */
621 /* EXTRA DELAY? */
622 sio_setreg(com, com_mcr, mcr_image | MCR_LOOPBACK);
623
624 /*
625 * Attempt to generate an output interrupt. On 8250's, setting
626 * IER_ETXRDY generates an interrupt independent of the current
627 * setting and independent of whether the THR is empty. On 16450's,
628 * setting IER_ETXRDY generates an interrupt independent of the
629 * current setting. On 16550A's, setting IER_ETXRDY only
630 * generates an interrupt when IER_ETXRDY is not already set.
631 */
632 sio_setreg(com, com_ier, IER_ETXRDY);
633
634 /*
635 * On some 16x50 incompatibles, setting IER_ETXRDY doesn't generate
636 * an interrupt. They'd better generate one for actually doing
637 * output. Loopback may be broken on the same incompatibles but
638 * it's unlikely to do more than allow the null byte out.
639 */
640 sio_setreg(com, com_data, 0);
641 if (iobase == siocniobase)
642 DELAY((1 + 2) * 1000000 / (comdefaultrate / 10));
643 else
644 DELAY((1 + 2) * 1000000 / (SIO_TEST_SPEED / 10));
645
646 /*
647 * Turn off loopback mode so that the interrupt gate works again
648 * (MCR_IENABLE was hidden). This should leave the device driving
649 * an interrupt line high. It doesn't matter if the interrupt
650 * line oscillates while we are not looking at it, since interrupts
651 * are disabled.
652 */
653 /* EXTRA DELAY? */
654 sio_setreg(com, com_mcr, mcr_image);
655
656 /*
657 * It seems my Xircom CBEM56G Cardbus modem wants to be reset
658 * to 8 bits *again*, or else probe test 0 will fail.
659 * gwk@sgi.com, 4/19/2001
660 */
661 sio_setreg(com, com_cfcr, CFCR_8BITS);
662
663 /*
664 * Some PCMCIA cards (Palido 321s, DC-1S, ...) have the "TXRDY bug",
665 * so we probe for a buggy IIR_TXRDY implementation even in the
666 * noprobe case. We don't probe for it in the !noprobe case because
667 * noprobe is always set for PCMCIA cards and the problem is not
668 * known to affect any other cards.
669 */
670 if (noprobe) {
671 /* Read IIR a few times. */
672 for (fn = 0; fn < 2; fn ++) {
673 DELAY(10000);
674 failures[6] = sio_getreg(com, com_iir);
675 }
676
677 /* IIR_TXRDY should be clear. Is it? */
678 result = 0;
679 if (failures[6] & IIR_TXRDY) {
680 /*
681 * No. We seem to have the bug. Does our fix for
682 * it work?
683 */
684 sio_setreg(com, com_ier, 0);
685 if (sio_getreg(com, com_iir) & IIR_NOPEND) {
686 /* Yes. We discovered the TXRDY bug! */
687 SET_FLAG(dev, COM_C_IIR_TXRDYBUG);
688 } else {
689 /* No. Just fail. XXX */
690 result = ENXIO;
691 sio_setreg(com, com_mcr, 0);
692 }
693 } else {
694 /* Yes. No bug. */
695 CLR_FLAG(dev, COM_C_IIR_TXRDYBUG);
696 }
697 sio_setreg(com, com_ier, 0);
698 sio_setreg(com, com_cfcr, CFCR_8BITS);
699 mtx_unlock_spin(&sio_lock);
700 bus_release_resource(dev, SYS_RES_IOPORT, rid, port);
701 if (iobase == siocniobase)
702 result = 0;
703 /*
704 * XXX: Since we don't return 0, we shouldn't be relying on
705 * the softc that we set to persist to the call to attach
706 * since other probe routines may be called, and the malloc
707 * here causes subr_bus to not allocate anything for the
708 * other probes. Instead, this softc is preserved and other
709 * probe routines can corrupt it.
710 */
711 if (result != 0) {
712 device_set_softc(dev, NULL);
713 free(com, M_DEVBUF);
714 }
715 return (result == 0 ? BUS_PROBE_DEFAULT + 1 : result);
716 }
717
718 /*
719 * Check that
720 * o the CFCR, IER and MCR in UART hold the values written to them
721 * (the values happen to be all distinct - this is good for
722 * avoiding false positive tests from bus echoes).
723 * o an output interrupt is generated and its vector is correct.
724 * o the interrupt goes away when the IIR in the UART is read.
725 */
726 /* EXTRA DELAY? */
727 failures[0] = sio_getreg(com, com_cfcr) - CFCR_8BITS;
728 failures[1] = sio_getreg(com, com_ier) - IER_ETXRDY;
729 failures[2] = sio_getreg(com, com_mcr) - mcr_image;
730 DELAY(10000); /* Some internal modems need this time */
731 irqmap[1] = isa_irq_pending();
732 failures[4] = (sio_getreg(com, com_iir) & IIR_IMASK) - IIR_TXRDY;
733 DELAY(1000); /* XXX */
734 irqmap[2] = isa_irq_pending();
735 failures[6] = (sio_getreg(com, com_iir) & IIR_IMASK) - IIR_NOPEND;
736
737 /*
738 * Turn off all device interrupts and check that they go off properly.
739 * Leave MCR_IENABLE alone. For ports without a master port, it gates
740 * the OUT2 output of the UART to
741 * the ICU input. Closing the gate would give a floating ICU input
742 * (unless there is another device driving it) and spurious interrupts.
743 * (On the system that this was first tested on, the input floats high
744 * and gives a (masked) interrupt as soon as the gate is closed.)
745 */
746 sio_setreg(com, com_ier, 0);
747 sio_setreg(com, com_cfcr, CFCR_8BITS); /* dummy to avoid bus echo */
748 failures[7] = sio_getreg(com, com_ier);
749 DELAY(1000); /* XXX */
750 irqmap[3] = isa_irq_pending();
751 failures[9] = (sio_getreg(com, com_iir) & IIR_IMASK) - IIR_NOPEND;
752
753 mtx_unlock_spin(&sio_lock);
754
755 irqs = irqmap[1] & ~irqmap[0];
756 if (bus_get_resource(idev, SYS_RES_IRQ, 0, &xirq, NULL) == 0 &&
757 ((1 << xirq) & irqs) == 0) {
758 printf(
759 "sio%d: configured irq %ld not in bitmap of probed irqs %#x\n",
760 device_get_unit(dev), xirq, irqs);
761 printf(
762 "sio%d: port may not be enabled\n",
763 device_get_unit(dev));
764 }
765 if (bootverbose)
766 printf("sio%d: irq maps: %#x %#x %#x %#x\n",
767 device_get_unit(dev),
768 irqmap[0], irqmap[1], irqmap[2], irqmap[3]);
769
770 result = 0;
771 for (fn = 0; fn < sizeof failures; ++fn)
772 if (failures[fn]) {
773 sio_setreg(com, com_mcr, 0);
774 result = ENXIO;
775 if (bootverbose) {
776 printf("sio%d: probe failed test(s):",
777 device_get_unit(dev));
778 for (fn = 0; fn < sizeof failures; ++fn)
779 if (failures[fn])
780 printf(" %d", fn);
781 printf("\n");
782 }
783 break;
784 }
785 bus_release_resource(dev, SYS_RES_IOPORT, rid, port);
786 if (iobase == siocniobase)
787 result = 0;
788 /*
789 * XXX: Since we don't return 0, we shouldn't be relying on the softc
790 * that we set to persist to the call to attach since other probe
791 * routines may be called, and the malloc here causes subr_bus to not
792 * allocate anything for the other probes. Instead, this softc is
793 * preserved and other probe routines can corrupt it.
794 */
795 if (result != 0) {
796 device_set_softc(dev, NULL);
797 free(com, M_DEVBUF);
798 }
799 return (result == 0 ? BUS_PROBE_DEFAULT + 1 : result);
800 }
801
802 #ifdef COM_ESP
803 static int
espattach(com,esp_port)804 espattach(com, esp_port)
805 struct com_s *com;
806 Port_t esp_port;
807 {
808 u_char dips;
809 u_char val;
810
811 /*
812 * Check the ESP-specific I/O port to see if we're an ESP
813 * card. If not, return failure immediately.
814 */
815 if ((inb(esp_port) & 0xf3) == 0) {
816 printf(" port 0x%x is not an ESP board?\n", esp_port);
817 return (0);
818 }
819
820 /*
821 * We've got something that claims to be a Hayes ESP card.
822 * Let's hope so.
823 */
824
825 /* Get the dip-switch configuration */
826 outb(esp_port + ESP_CMD1, ESP_GETDIPS);
827 dips = inb(esp_port + ESP_STATUS1);
828
829 /*
830 * Bits 0,1 of dips say which COM port we are.
831 */
832 if (rman_get_start(com->ioportres) == likely_com_ports[dips & 0x03])
833 printf(" : ESP");
834 else {
835 printf(" esp_port has com %d\n", dips & 0x03);
836 return (0);
837 }
838
839 /*
840 * Check for ESP version 2.0 or later: bits 4,5,6 = 010.
841 */
842 outb(esp_port + ESP_CMD1, ESP_GETTEST);
843 val = inb(esp_port + ESP_STATUS1); /* clear reg 1 */
844 val = inb(esp_port + ESP_STATUS2);
845 if ((val & 0x70) < 0x20) {
846 printf("-old (%o)", val & 0x70);
847 return (0);
848 }
849
850 /*
851 * Check for ability to emulate 16550: bit 7 == 1
852 */
853 if ((dips & 0x80) == 0) {
854 printf(" slave");
855 return (0);
856 }
857
858 /*
859 * Okay, we seem to be a Hayes ESP card. Whee.
860 */
861 com->esp = TRUE;
862 com->esp_port = esp_port;
863 return (1);
864 }
865 #endif /* COM_ESP */
866
867 int
sioattach(dev,xrid,rclk)868 sioattach(dev, xrid, rclk)
869 device_t dev;
870 int xrid;
871 u_long rclk;
872 {
873 struct com_s *com;
874 #ifdef COM_ESP
875 Port_t *espp;
876 #endif
877 Port_t iobase;
878 int unit;
879 u_int flags;
880 int rid;
881 struct resource *port;
882 int ret;
883 int error;
884 struct tty *tp;
885
886 rid = xrid;
887 port = bus_alloc_resource_anywhere(dev, SYS_RES_IOPORT, &rid,
888 IO_COMSIZE, RF_ACTIVE);
889 if (!port)
890 return (ENXIO);
891
892 iobase = rman_get_start(port);
893 unit = device_get_unit(dev);
894 com = device_get_softc(dev);
895 flags = device_get_flags(dev);
896
897 if (unit >= sio_numunits)
898 sio_numunits = unit + 1;
899 /*
900 * sioprobe() has initialized the device registers as follows:
901 * o cfcr = CFCR_8BITS.
902 * It is most important that CFCR_DLAB is off, so that the
903 * data port is not hidden when we enable interrupts.
904 * o ier = 0.
905 * Interrupts are only enabled when the line is open.
906 * o mcr = MCR_IENABLE, or 0 if the port has AST/4 compatible
907 * interrupt control register or the config specifies no irq.
908 * Keeping MCR_DTR and MCR_RTS off might stop the external
909 * device from sending before we are ready.
910 */
911 bzero(com, sizeof *com);
912 com->unit = unit;
913 com->ioportres = port;
914 com->ioportrid = rid;
915 com->bst = rman_get_bustag(port);
916 com->bsh = rman_get_bushandle(port);
917 com->cfcr_image = CFCR_8BITS;
918 com->loses_outints = COM_LOSESOUTINTS(flags) != 0;
919 com->no_irq = bus_get_resource(dev, SYS_RES_IRQ, 0, NULL, NULL) != 0;
920 com->tx_fifo_size = 1;
921 com->obufs[0].l_head = com->obuf1;
922 com->obufs[1].l_head = com->obuf2;
923
924 com->data_port = iobase + com_data;
925 com->int_ctl_port = iobase + com_ier;
926 com->int_id_port = iobase + com_iir;
927 com->modem_ctl_port = iobase + com_mcr;
928 com->mcr_image = inb(com->modem_ctl_port);
929 com->line_status_port = iobase + com_lsr;
930 com->modem_status_port = iobase + com_msr;
931
932 tp = com->tp = ttyalloc();
933 tp->t_oproc = comstart;
934 tp->t_param = comparam;
935 tp->t_stop = comstop;
936 tp->t_modem = commodem;
937 tp->t_break = combreak;
938 tp->t_close = comclose;
939 tp->t_open = comopen;
940 tp->t_sc = com;
941
942 if (rclk == 0)
943 rclk = DEFAULT_RCLK;
944 com->rclk = rclk;
945
946 if (unit == comconsole)
947 ttyconsolemode(tp, comdefaultrate);
948 error = siosetwater(com, tp->t_init_in.c_ispeed);
949 mtx_unlock_spin(&sio_lock);
950 if (error) {
951 /*
952 * Leave i/o resources allocated if this is a `cn'-level
953 * console, so that other devices can't snarf them.
954 */
955 if (iobase != siocniobase)
956 bus_release_resource(dev, SYS_RES_IOPORT, rid, port);
957 return (ENOMEM);
958 }
959
960 /* attempt to determine UART type */
961 printf("sio%d: type", unit);
962
963 if (!COM_ISMULTIPORT(flags) &&
964 !COM_IIR_TXRDYBUG(flags) && !COM_NOSCR(flags)) {
965 u_char scr;
966 u_char scr1;
967 u_char scr2;
968
969 scr = sio_getreg(com, com_scr);
970 sio_setreg(com, com_scr, 0xa5);
971 scr1 = sio_getreg(com, com_scr);
972 sio_setreg(com, com_scr, 0x5a);
973 scr2 = sio_getreg(com, com_scr);
974 sio_setreg(com, com_scr, scr);
975 if (scr1 != 0xa5 || scr2 != 0x5a) {
976 printf(" 8250 or not responding");
977 goto determined_type;
978 }
979 }
980 sio_setreg(com, com_fifo, FIFO_ENABLE | FIFO_RX_HIGH);
981 DELAY(100);
982 switch (inb(com->int_id_port) & IIR_FIFO_MASK) {
983 case FIFO_RX_LOW:
984 printf(" 16450");
985 break;
986 case FIFO_RX_MEDL:
987 printf(" 16450?");
988 break;
989 case FIFO_RX_MEDH:
990 printf(" 16550?");
991 break;
992 case FIFO_RX_HIGH:
993 if (COM_NOFIFO(flags)) {
994 printf(" 16550A fifo disabled");
995 break;
996 }
997 com->hasfifo = TRUE;
998 if (COM_ST16650A(flags)) {
999 printf(" ST16650A");
1000 com->st16650a = TRUE;
1001 com->tx_fifo_size = 32;
1002 break;
1003 }
1004 if (COM_TI16754(flags)) {
1005 printf(" TI16754");
1006 com->tx_fifo_size = 64;
1007 break;
1008 }
1009 printf(" 16550A");
1010 #ifdef COM_ESP
1011 for (espp = likely_esp_ports; *espp != 0; espp++)
1012 if (espattach(com, *espp)) {
1013 com->tx_fifo_size = 1024;
1014 break;
1015 }
1016 if (com->esp)
1017 break;
1018 #endif
1019 com->tx_fifo_size = COM_FIFOSIZE(flags);
1020 if (com->tx_fifo_size == 0)
1021 com->tx_fifo_size = 16;
1022 else
1023 printf(" lookalike with %u bytes FIFO",
1024 com->tx_fifo_size);
1025 break;
1026 }
1027 #ifdef COM_ESP
1028 if (com->esp) {
1029 /*
1030 * Set 16550 compatibility mode.
1031 * We don't use the ESP_MODE_SCALE bit to increase the
1032 * fifo trigger levels because we can't handle large
1033 * bursts of input.
1034 * XXX flow control should be set in comparam(), not here.
1035 */
1036 outb(com->esp_port + ESP_CMD1, ESP_SETMODE);
1037 outb(com->esp_port + ESP_CMD2, ESP_MODE_RTS | ESP_MODE_FIFO);
1038
1039 /* Set RTS/CTS flow control. */
1040 outb(com->esp_port + ESP_CMD1, ESP_SETFLOWTYPE);
1041 outb(com->esp_port + ESP_CMD2, ESP_FLOW_RTS);
1042 outb(com->esp_port + ESP_CMD2, ESP_FLOW_CTS);
1043
1044 /* Set flow-control levels. */
1045 outb(com->esp_port + ESP_CMD1, ESP_SETRXFLOW);
1046 outb(com->esp_port + ESP_CMD2, HIBYTE(768));
1047 outb(com->esp_port + ESP_CMD2, LOBYTE(768));
1048 outb(com->esp_port + ESP_CMD2, HIBYTE(512));
1049 outb(com->esp_port + ESP_CMD2, LOBYTE(512));
1050 }
1051 #endif /* COM_ESP */
1052 sio_setreg(com, com_fifo, 0);
1053 determined_type: ;
1054
1055 #ifdef COM_MULTIPORT
1056 if (COM_ISMULTIPORT(flags)) {
1057 device_t masterdev;
1058
1059 com->multiport = TRUE;
1060 printf(" (multiport");
1061 if (unit == COM_MPMASTER(flags))
1062 printf(" master");
1063 printf(")");
1064 masterdev = devclass_get_device(sio_devclass,
1065 COM_MPMASTER(flags));
1066 com->no_irq = (masterdev == NULL || bus_get_resource(masterdev,
1067 SYS_RES_IRQ, 0, NULL, NULL) != 0);
1068 }
1069 #endif /* COM_MULTIPORT */
1070 if (unit == comconsole)
1071 printf(", console");
1072 if (COM_IIR_TXRDYBUG(flags))
1073 printf(" with a buggy IIR_TXRDY implementation");
1074 printf("\n");
1075
1076 if (sio_fast_ih == NULL) {
1077 swi_add(&tty_intr_event, "sio", siopoll, NULL, SWI_TTY, 0,
1078 &sio_fast_ih);
1079 swi_add(&clk_intr_event, "sio", siopoll, NULL, SWI_CLOCK, 0,
1080 &sio_slow_ih);
1081 }
1082
1083 com->flags = flags;
1084 com->pps.ppscap = PPS_CAPTUREASSERT | PPS_CAPTURECLEAR;
1085 tp->t_pps = &com->pps;
1086
1087 if (COM_PPSCTS(flags))
1088 com->pps_bit = MSR_CTS;
1089 else
1090 com->pps_bit = MSR_DCD;
1091 pps_init(&com->pps);
1092
1093 rid = 0;
1094 com->irqres = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, RF_ACTIVE);
1095 if (com->irqres) {
1096 ret = bus_setup_intr(dev, com->irqres,
1097 INTR_TYPE_TTY,
1098 siointr, NULL, com,
1099 &com->cookie);
1100 if (ret) {
1101 ret = bus_setup_intr(dev,
1102 com->irqres, INTR_TYPE_TTY,
1103 NULL, (driver_intr_t *)siointr, com, &com->cookie);
1104 if (ret == 0)
1105 device_printf(dev, "unable to activate interrupt in fast mode - using normal mode\n");
1106 }
1107 if (ret)
1108 device_printf(dev, "could not activate interrupt\n");
1109 #if defined(KDB)
1110 /*
1111 * Enable interrupts for early break-to-debugger support
1112 * on the console.
1113 */
1114 if (ret == 0 && unit == comconsole)
1115 outb(siocniobase + com_ier, IER_ERXRDY | IER_ERLS |
1116 IER_EMSC);
1117 #endif
1118 }
1119
1120 /* We're ready, open the doors... */
1121 ttycreate(tp, TS_CALLOUT, "d%r", unit);
1122
1123 return (0);
1124 }
1125
1126 static int
comopen(struct tty * tp,struct cdev * dev)1127 comopen(struct tty *tp, struct cdev *dev)
1128 {
1129 struct com_s *com;
1130 int i;
1131
1132 com = tp->t_sc;
1133 com->poll = com->no_irq;
1134 com->poll_output = com->loses_outints;
1135 if (com->hasfifo) {
1136 /*
1137 * (Re)enable and drain fifos.
1138 *
1139 * Certain SMC chips cause problems if the fifos
1140 * are enabled while input is ready. Turn off the
1141 * fifo if necessary to clear the input. We test
1142 * the input ready bit after enabling the fifos
1143 * since we've already enabled them in comparam()
1144 * and to handle races between enabling and fresh
1145 * input.
1146 */
1147 for (i = 0; i < 500; i++) {
1148 sio_setreg(com, com_fifo,
1149 FIFO_RCV_RST | FIFO_XMT_RST
1150 | com->fifo_image);
1151 /*
1152 * XXX the delays are for superstitious
1153 * historical reasons. It must be less than
1154 * the character time at the maximum
1155 * supported speed (87 usec at 115200 bps
1156 * 8N1). Otherwise we might loop endlessly
1157 * if data is streaming in. We used to use
1158 * delays of 100. That usually worked
1159 * because DELAY(100) used to usually delay
1160 * for about 85 usec instead of 100.
1161 */
1162 DELAY(50);
1163 if (!(inb(com->line_status_port) & LSR_RXRDY))
1164 break;
1165 sio_setreg(com, com_fifo, 0);
1166 DELAY(50);
1167 (void) inb(com->data_port);
1168 }
1169 if (i == 500)
1170 return (EIO);
1171 }
1172
1173 mtx_lock_spin(&sio_lock);
1174 (void) inb(com->line_status_port);
1175 (void) inb(com->data_port);
1176 com->prev_modem_status = com->last_modem_status
1177 = inb(com->modem_status_port);
1178 outb(com->int_ctl_port,
1179 IER_ERXRDY | IER_ERLS | IER_EMSC
1180 | (COM_IIR_TXRDYBUG(com->flags) ? 0 : IER_ETXRDY));
1181 mtx_unlock_spin(&sio_lock);
1182 siosettimeout();
1183 /* XXX: should be generic ? */
1184 if (com->prev_modem_status & MSR_DCD || ISCALLOUT(dev))
1185 ttyld_modem(tp, 1);
1186 return (0);
1187 }
1188
1189 static void
comclose(tp)1190 comclose(tp)
1191 struct tty *tp;
1192 {
1193 int s;
1194 struct com_s *com;
1195
1196 s = spltty();
1197 com = tp->t_sc;
1198 com->poll = FALSE;
1199 com->poll_output = FALSE;
1200 sio_setreg(com, com_cfcr, com->cfcr_image &= ~CFCR_SBREAK);
1201
1202 #if defined(KDB)
1203 /*
1204 * Leave interrupts enabled and don't clear DTR if this is the
1205 * console. This allows us to detect break-to-debugger events
1206 * while the console device is closed.
1207 */
1208 if (com->unit != comconsole)
1209 #endif
1210 {
1211 sio_setreg(com, com_ier, 0);
1212 if (tp->t_cflag & HUPCL
1213 /*
1214 * XXX we will miss any carrier drop between here and the
1215 * next open. Perhaps we should watch DCD even when the
1216 * port is closed; it is not sufficient to check it at
1217 * the next open because it might go up and down while
1218 * we're not watching.
1219 */
1220 || (!tp->t_actout
1221 && !(com->prev_modem_status & MSR_DCD)
1222 && !(tp->t_init_in.c_cflag & CLOCAL))
1223 || !(tp->t_state & TS_ISOPEN)) {
1224 (void)commodem(tp, 0, SER_DTR);
1225 ttydtrwaitstart(tp);
1226 }
1227 }
1228 if (com->hasfifo) {
1229 /*
1230 * Disable fifos so that they are off after controlled
1231 * reboots. Some BIOSes fail to detect 16550s when the
1232 * fifos are enabled.
1233 */
1234 sio_setreg(com, com_fifo, 0);
1235 }
1236 tp->t_actout = FALSE;
1237 wakeup(&tp->t_actout);
1238 wakeup(TSA_CARR_ON(tp)); /* restart any wopeners */
1239 siosettimeout();
1240 splx(s);
1241 }
1242
1243 static void
siobusycheck(chan)1244 siobusycheck(chan)
1245 void *chan;
1246 {
1247 struct com_s *com;
1248 int s;
1249
1250 com = (struct com_s *)chan;
1251
1252 /*
1253 * Clear TS_BUSY if low-level output is complete.
1254 * spl locking is sufficient because siointr1() does not set CS_BUSY.
1255 * If siointr1() clears CS_BUSY after we look at it, then we'll get
1256 * called again. Reading the line status port outside of siointr1()
1257 * is safe because CS_BUSY is clear so there are no output interrupts
1258 * to lose.
1259 */
1260 s = spltty();
1261 if (com->state & CS_BUSY)
1262 com->extra_state &= ~CSE_BUSYCHECK; /* False alarm. */
1263 else if ((inb(com->line_status_port) & (LSR_TSRE | LSR_TXRDY))
1264 == (LSR_TSRE | LSR_TXRDY)) {
1265 com->tp->t_state &= ~TS_BUSY;
1266 ttwwakeup(com->tp);
1267 com->extra_state &= ~CSE_BUSYCHECK;
1268 } else
1269 timeout(siobusycheck, com, hz / 100);
1270 splx(s);
1271 }
1272
1273 static u_int
siodivisor(rclk,speed)1274 siodivisor(rclk, speed)
1275 u_long rclk;
1276 speed_t speed;
1277 {
1278 long actual_speed;
1279 u_int divisor;
1280 int error;
1281
1282 if (speed == 0)
1283 return (0);
1284 #if UINT_MAX > (ULONG_MAX - 1) / 8
1285 if (speed > (ULONG_MAX - 1) / 8)
1286 return (0);
1287 #endif
1288 divisor = (rclk / (8UL * speed) + 1) / 2;
1289 if (divisor == 0 || divisor >= 65536)
1290 return (0);
1291 actual_speed = rclk / (16UL * divisor);
1292
1293 /* 10 times error in percent: */
1294 error = ((actual_speed - (long)speed) * 2000 / (long)speed + 1) / 2;
1295
1296 /* 3.0% maximum error tolerance: */
1297 if (error < -30 || error > 30)
1298 return (0);
1299
1300 return (divisor);
1301 }
1302
1303 /*
1304 * Call this function with the sio_lock mutex held. It will return with the
1305 * lock still held.
1306 */
1307 static void
sioinput(com)1308 sioinput(com)
1309 struct com_s *com;
1310 {
1311 u_char *buf;
1312 int incc;
1313 u_char line_status;
1314 int recv_data;
1315 struct tty *tp;
1316
1317 buf = com->ibuf;
1318 tp = com->tp;
1319 if (!(tp->t_state & TS_ISOPEN) || !(tp->t_cflag & CREAD)) {
1320 com_events -= (com->iptr - com->ibuf);
1321 com->iptr = com->ibuf;
1322 return;
1323 }
1324 if (tp->t_state & TS_CAN_BYPASS_L_RINT) {
1325 /*
1326 * Avoid the grotesquely inefficient lineswitch routine
1327 * (ttyinput) in "raw" mode. It usually takes about 450
1328 * instructions (that's without canonical processing or echo!).
1329 * slinput is reasonably fast (usually 40 instructions plus
1330 * call overhead).
1331 */
1332 do {
1333 /*
1334 * This may look odd, but it is using save-and-enable
1335 * semantics instead of the save-and-disable semantics
1336 * that are used everywhere else.
1337 */
1338 mtx_unlock_spin(&sio_lock);
1339 incc = com->iptr - buf;
1340 if (tp->t_rawq.c_cc + incc > tp->t_ihiwat
1341 && (com->state & CS_RTS_IFLOW
1342 || tp->t_iflag & IXOFF)
1343 && !(tp->t_state & TS_TBLOCK))
1344 ttyblock(tp);
1345 com->delta_error_counts[CE_TTY_BUF_OVERFLOW]
1346 += b_to_q((char *)buf, incc, &tp->t_rawq);
1347 buf += incc;
1348 tk_nin += incc;
1349 tk_rawcc += incc;
1350 tp->t_rawcc += incc;
1351 ttwakeup(tp);
1352 if (tp->t_state & TS_TTSTOP
1353 && (tp->t_iflag & IXANY
1354 || tp->t_cc[VSTART] == tp->t_cc[VSTOP])) {
1355 tp->t_state &= ~TS_TTSTOP;
1356 tp->t_lflag &= ~FLUSHO;
1357 comstart(tp);
1358 }
1359 mtx_lock_spin(&sio_lock);
1360 } while (buf < com->iptr);
1361 } else {
1362 do {
1363 /*
1364 * This may look odd, but it is using save-and-enable
1365 * semantics instead of the save-and-disable semantics
1366 * that are used everywhere else.
1367 */
1368 mtx_unlock_spin(&sio_lock);
1369 line_status = buf[com->ierroff];
1370 recv_data = *buf++;
1371 if (line_status
1372 & (LSR_BI | LSR_FE | LSR_OE | LSR_PE)) {
1373 if (line_status & LSR_BI)
1374 recv_data |= TTY_BI;
1375 if (line_status & LSR_FE)
1376 recv_data |= TTY_FE;
1377 if (line_status & LSR_OE)
1378 recv_data |= TTY_OE;
1379 if (line_status & LSR_PE)
1380 recv_data |= TTY_PE;
1381 }
1382 ttyld_rint(tp, recv_data);
1383 mtx_lock_spin(&sio_lock);
1384 } while (buf < com->iptr);
1385 }
1386 com_events -= (com->iptr - com->ibuf);
1387 com->iptr = com->ibuf;
1388
1389 /*
1390 * There is now room for another low-level buffer full of input,
1391 * so enable RTS if it is now disabled and there is room in the
1392 * high-level buffer.
1393 */
1394 if ((com->state & CS_RTS_IFLOW) && !(com->mcr_image & MCR_RTS) &&
1395 !(tp->t_state & TS_TBLOCK))
1396 outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS);
1397 }
1398
1399 static int
siointr(arg)1400 siointr(arg)
1401 void *arg;
1402 {
1403 struct com_s *com;
1404
1405 #ifndef COM_MULTIPORT
1406 com = (struct com_s *)arg;
1407
1408 mtx_lock_spin(&sio_lock);
1409 siointr1(com);
1410 mtx_unlock_spin(&sio_lock);
1411 #else /* COM_MULTIPORT */
1412 bool_t possibly_more_intrs;
1413 int unit;
1414
1415 /*
1416 * Loop until there is no activity on any port. This is necessary
1417 * to get an interrupt edge more than to avoid another interrupt.
1418 * If the IRQ signal is just an OR of the IRQ signals from several
1419 * devices, then the edge from one may be lost because another is
1420 * on.
1421 */
1422 mtx_lock_spin(&sio_lock);
1423 do {
1424 possibly_more_intrs = FALSE;
1425 for (unit = 0; unit < sio_numunits; ++unit) {
1426 com = com_addr(unit);
1427 /*
1428 * XXX COM_LOCK();
1429 * would it work here, or be counter-productive?
1430 */
1431 if (com != NULL
1432 && !com->gone
1433 && (inb(com->int_id_port) & IIR_IMASK)
1434 != IIR_NOPEND) {
1435 siointr1(com);
1436 possibly_more_intrs = TRUE;
1437 }
1438 /* XXX COM_UNLOCK(); */
1439 }
1440 } while (possibly_more_intrs);
1441 mtx_unlock_spin(&sio_lock);
1442 #endif /* COM_MULTIPORT */
1443 return(FILTER_HANDLED);
1444 }
1445
1446 static struct timespec siots[8];
1447 static int siotso;
1448 static int volatile siotsunit = -1;
1449
1450 static int
sysctl_siots(SYSCTL_HANDLER_ARGS)1451 sysctl_siots(SYSCTL_HANDLER_ARGS)
1452 {
1453 char buf[128];
1454 long long delta;
1455 size_t len;
1456 int error, i, tso;
1457
1458 for (i = 1, tso = siotso; i < tso; i++) {
1459 delta = (long long)(siots[i].tv_sec - siots[i - 1].tv_sec) *
1460 1000000000 +
1461 (siots[i].tv_nsec - siots[i - 1].tv_nsec);
1462 len = sprintf(buf, "%lld\n", delta);
1463 if (delta >= 110000)
1464 len += sprintf(buf + len - 1, ": *** %ld.%09ld\n",
1465 (long)siots[i].tv_sec, siots[i].tv_nsec) - 1;
1466 if (i == tso - 1)
1467 buf[len - 1] = '\0';
1468 error = SYSCTL_OUT(req, buf, len);
1469 if (error != 0)
1470 return (error);
1471 }
1472 return (0);
1473 }
1474
1475 SYSCTL_PROC(_machdep, OID_AUTO, siots, CTLTYPE_STRING | CTLFLAG_RD,
1476 0, 0, sysctl_siots, "A", "sio timestamps");
1477
1478 static void
siointr1(com)1479 siointr1(com)
1480 struct com_s *com;
1481 {
1482 u_char int_ctl;
1483 u_char int_ctl_new;
1484 u_char line_status;
1485 u_char modem_status;
1486 u_char *ioptr;
1487 u_char recv_data;
1488
1489 #ifdef KDB
1490 again:
1491 #endif
1492
1493 if (COM_IIR_TXRDYBUG(com->flags)) {
1494 int_ctl = inb(com->int_ctl_port);
1495 int_ctl_new = int_ctl;
1496 } else {
1497 int_ctl = 0;
1498 int_ctl_new = 0;
1499 }
1500
1501 while (!com->gone) {
1502 if (com->pps.ppsparam.mode & PPS_CAPTUREBOTH) {
1503 modem_status = inb(com->modem_status_port);
1504 if ((modem_status ^ com->last_modem_status) &
1505 com->pps_bit) {
1506 pps_capture(&com->pps);
1507 pps_event(&com->pps,
1508 (modem_status & com->pps_bit) ?
1509 PPS_CAPTUREASSERT : PPS_CAPTURECLEAR);
1510 }
1511 }
1512 line_status = inb(com->line_status_port);
1513
1514 /* input event? (check first to help avoid overruns) */
1515 while (line_status & LSR_RCV_MASK) {
1516 /* break/unnattached error bits or real input? */
1517 if (!(line_status & LSR_RXRDY))
1518 recv_data = 0;
1519 else
1520 recv_data = inb(com->data_port);
1521 #ifdef KDB
1522 if (com->unit == comconsole &&
1523 kdb_alt_break(recv_data, &com->alt_brk_state) != 0)
1524 goto again;
1525 #endif /* KDB */
1526 if (line_status & (LSR_BI | LSR_FE | LSR_PE)) {
1527 /*
1528 * Don't store BI if IGNBRK or FE/PE if IGNPAR.
1529 * Otherwise, push the work to a higher level
1530 * (to handle PARMRK) if we're bypassing.
1531 * Otherwise, convert BI/FE and PE+INPCK to 0.
1532 *
1533 * This makes bypassing work right in the
1534 * usual "raw" case (IGNBRK set, and IGNPAR
1535 * and INPCK clear).
1536 *
1537 * Note: BI together with FE/PE means just BI.
1538 */
1539 if (line_status & LSR_BI) {
1540 #if defined(KDB)
1541 if (com->unit == comconsole) {
1542 kdb_break();
1543 goto cont;
1544 }
1545 #endif
1546 if (com->tp == NULL
1547 || com->tp->t_iflag & IGNBRK)
1548 goto cont;
1549 } else {
1550 if (com->tp == NULL
1551 || com->tp->t_iflag & IGNPAR)
1552 goto cont;
1553 }
1554 if (com->tp->t_state & TS_CAN_BYPASS_L_RINT
1555 && (line_status & (LSR_BI | LSR_FE)
1556 || com->tp->t_iflag & INPCK))
1557 recv_data = 0;
1558 }
1559 ++com->bytes_in;
1560 if (com->tp != NULL &&
1561 com->tp->t_hotchar != 0 && recv_data == com->tp->t_hotchar)
1562 swi_sched(sio_fast_ih, 0);
1563 ioptr = com->iptr;
1564 if (ioptr >= com->ibufend)
1565 CE_RECORD(com, CE_INTERRUPT_BUF_OVERFLOW);
1566 else {
1567 if (com->tp != NULL && com->tp->t_do_timestamp)
1568 microtime(&com->tp->t_timestamp);
1569 ++com_events;
1570 swi_sched(sio_slow_ih, SWI_DELAY);
1571 #if 0 /* for testing input latency vs efficiency */
1572 if (com->iptr - com->ibuf == 8)
1573 swi_sched(sio_fast_ih, 0);
1574 #endif
1575 ioptr[0] = recv_data;
1576 ioptr[com->ierroff] = line_status;
1577 com->iptr = ++ioptr;
1578 if (ioptr == com->ihighwater
1579 && com->state & CS_RTS_IFLOW)
1580 outb(com->modem_ctl_port,
1581 com->mcr_image &= ~MCR_RTS);
1582 if (line_status & LSR_OE)
1583 CE_RECORD(com, CE_OVERRUN);
1584 }
1585 cont:
1586 if (line_status & LSR_TXRDY
1587 && com->state >= (CS_BUSY | CS_TTGO | CS_ODEVREADY))
1588 goto txrdy;
1589
1590 /*
1591 * "& 0x7F" is to avoid the gcc-1.40 generating a slow
1592 * jump from the top of the loop to here
1593 */
1594 line_status = inb(com->line_status_port) & 0x7F;
1595 }
1596
1597 /* modem status change? (always check before doing output) */
1598 modem_status = inb(com->modem_status_port);
1599 if (modem_status != com->last_modem_status) {
1600 /*
1601 * Schedule high level to handle DCD changes. Note
1602 * that we don't use the delta bits anywhere. Some
1603 * UARTs mess them up, and it's easy to remember the
1604 * previous bits and calculate the delta.
1605 */
1606 com->last_modem_status = modem_status;
1607 if (!(com->state & CS_CHECKMSR)) {
1608 com_events += LOTS_OF_EVENTS;
1609 com->state |= CS_CHECKMSR;
1610 swi_sched(sio_fast_ih, 0);
1611 }
1612
1613 /* handle CTS change immediately for crisp flow ctl */
1614 if (com->state & CS_CTS_OFLOW) {
1615 if (modem_status & MSR_CTS)
1616 com->state |= CS_ODEVREADY;
1617 else
1618 com->state &= ~CS_ODEVREADY;
1619 }
1620 }
1621
1622 txrdy:
1623 /* output queued and everything ready? */
1624 if (line_status & LSR_TXRDY
1625 && com->state >= (CS_BUSY | CS_TTGO | CS_ODEVREADY)) {
1626 ioptr = com->obufq.l_head;
1627 if (com->tx_fifo_size > 1 && com->unit != siotsunit) {
1628 u_int ocount;
1629
1630 ocount = com->obufq.l_tail - ioptr;
1631 if (ocount > com->tx_fifo_size)
1632 ocount = com->tx_fifo_size;
1633 com->bytes_out += ocount;
1634 do
1635 outb(com->data_port, *ioptr++);
1636 while (--ocount != 0);
1637 } else {
1638 outb(com->data_port, *ioptr++);
1639 ++com->bytes_out;
1640 if (com->unit == siotsunit
1641 && siotso < nitems(siots))
1642 nanouptime(&siots[siotso++]);
1643 }
1644 com->obufq.l_head = ioptr;
1645 if (COM_IIR_TXRDYBUG(com->flags))
1646 int_ctl_new = int_ctl | IER_ETXRDY;
1647 if (ioptr >= com->obufq.l_tail) {
1648 struct lbq *qp;
1649
1650 qp = com->obufq.l_next;
1651 qp->l_queued = FALSE;
1652 qp = qp->l_next;
1653 if (qp != NULL) {
1654 com->obufq.l_head = qp->l_head;
1655 com->obufq.l_tail = qp->l_tail;
1656 com->obufq.l_next = qp;
1657 } else {
1658 /* output just completed */
1659 if (COM_IIR_TXRDYBUG(com->flags))
1660 int_ctl_new = int_ctl
1661 & ~IER_ETXRDY;
1662 com->state &= ~CS_BUSY;
1663 }
1664 if (!(com->state & CS_ODONE)) {
1665 com_events += LOTS_OF_EVENTS;
1666 com->state |= CS_ODONE;
1667 /* handle at high level ASAP */
1668 swi_sched(sio_fast_ih, 0);
1669 }
1670 }
1671 if (COM_IIR_TXRDYBUG(com->flags)
1672 && int_ctl != int_ctl_new)
1673 outb(com->int_ctl_port, int_ctl_new);
1674 }
1675
1676 /* finished? */
1677 #ifndef COM_MULTIPORT
1678 if ((inb(com->int_id_port) & IIR_IMASK) == IIR_NOPEND)
1679 #endif /* COM_MULTIPORT */
1680 return;
1681 }
1682 }
1683
1684 /* software interrupt handler for SWI_TTY */
1685 static void
siopoll(void * dummy)1686 siopoll(void *dummy)
1687 {
1688 int unit;
1689
1690 if (com_events == 0)
1691 return;
1692 repeat:
1693 for (unit = 0; unit < sio_numunits; ++unit) {
1694 struct com_s *com;
1695 int incc;
1696 struct tty *tp;
1697
1698 com = com_addr(unit);
1699 if (com == NULL)
1700 continue;
1701 tp = com->tp;
1702 if (tp == NULL || com->gone) {
1703 /*
1704 * Discard any events related to never-opened or
1705 * going-away devices.
1706 */
1707 mtx_lock_spin(&sio_lock);
1708 incc = com->iptr - com->ibuf;
1709 com->iptr = com->ibuf;
1710 if (com->state & CS_CHECKMSR) {
1711 incc += LOTS_OF_EVENTS;
1712 com->state &= ~CS_CHECKMSR;
1713 }
1714 com_events -= incc;
1715 mtx_unlock_spin(&sio_lock);
1716 continue;
1717 }
1718 if (com->iptr != com->ibuf) {
1719 mtx_lock_spin(&sio_lock);
1720 sioinput(com);
1721 mtx_unlock_spin(&sio_lock);
1722 }
1723 if (com->state & CS_CHECKMSR) {
1724 u_char delta_modem_status;
1725
1726 mtx_lock_spin(&sio_lock);
1727 delta_modem_status = com->last_modem_status
1728 ^ com->prev_modem_status;
1729 com->prev_modem_status = com->last_modem_status;
1730 com_events -= LOTS_OF_EVENTS;
1731 com->state &= ~CS_CHECKMSR;
1732 mtx_unlock_spin(&sio_lock);
1733 if (delta_modem_status & MSR_DCD)
1734 ttyld_modem(tp,
1735 com->prev_modem_status & MSR_DCD);
1736 }
1737 if (com->state & CS_ODONE) {
1738 mtx_lock_spin(&sio_lock);
1739 com_events -= LOTS_OF_EVENTS;
1740 com->state &= ~CS_ODONE;
1741 mtx_unlock_spin(&sio_lock);
1742 if (!(com->state & CS_BUSY)
1743 && !(com->extra_state & CSE_BUSYCHECK)) {
1744 timeout(siobusycheck, com, hz / 100);
1745 com->extra_state |= CSE_BUSYCHECK;
1746 }
1747 ttyld_start(tp);
1748 }
1749 if (com_events == 0)
1750 break;
1751 }
1752 if (com_events >= LOTS_OF_EVENTS)
1753 goto repeat;
1754 }
1755
1756 static void
combreak(tp,sig)1757 combreak(tp, sig)
1758 struct tty *tp;
1759 int sig;
1760 {
1761 struct com_s *com;
1762
1763 com = tp->t_sc;
1764
1765 if (sig)
1766 sio_setreg(com, com_cfcr, com->cfcr_image |= CFCR_SBREAK);
1767 else
1768 sio_setreg(com, com_cfcr, com->cfcr_image &= ~CFCR_SBREAK);
1769 }
1770
1771 static int
comparam(tp,t)1772 comparam(tp, t)
1773 struct tty *tp;
1774 struct termios *t;
1775 {
1776 u_int cfcr;
1777 int cflag;
1778 struct com_s *com;
1779 u_int divisor;
1780 u_char dlbh;
1781 u_char dlbl;
1782 u_char efr_flowbits;
1783 int s;
1784
1785 com = tp->t_sc;
1786 if (com == NULL)
1787 return (ENODEV);
1788
1789 /* check requested parameters */
1790 if (t->c_ispeed != (t->c_ospeed != 0 ? t->c_ospeed : tp->t_ospeed))
1791 return (EINVAL);
1792 divisor = siodivisor(com->rclk, t->c_ispeed);
1793 if (divisor == 0)
1794 return (EINVAL);
1795
1796 /* parameters are OK, convert them to the com struct and the device */
1797 s = spltty();
1798 if (t->c_ospeed == 0)
1799 (void)commodem(tp, 0, SER_DTR); /* hang up line */
1800 else
1801 (void)commodem(tp, SER_DTR, 0);
1802 cflag = t->c_cflag;
1803 switch (cflag & CSIZE) {
1804 case CS5:
1805 cfcr = CFCR_5BITS;
1806 break;
1807 case CS6:
1808 cfcr = CFCR_6BITS;
1809 break;
1810 case CS7:
1811 cfcr = CFCR_7BITS;
1812 break;
1813 default:
1814 cfcr = CFCR_8BITS;
1815 break;
1816 }
1817 if (cflag & PARENB) {
1818 cfcr |= CFCR_PENAB;
1819 if (!(cflag & PARODD))
1820 cfcr |= CFCR_PEVEN;
1821 }
1822 if (cflag & CSTOPB)
1823 cfcr |= CFCR_STOPB;
1824
1825 if (com->hasfifo) {
1826 /*
1827 * Use a fifo trigger level low enough so that the input
1828 * latency from the fifo is less than about 16 msec and
1829 * the total latency is less than about 30 msec. These
1830 * latencies are reasonable for humans. Serial comms
1831 * protocols shouldn't expect anything better since modem
1832 * latencies are larger.
1833 *
1834 * The fifo trigger level cannot be set at RX_HIGH for high
1835 * speed connections without further work on reducing
1836 * interrupt disablement times in other parts of the system,
1837 * without producing silo overflow errors.
1838 */
1839 com->fifo_image = com->unit == siotsunit ? 0
1840 : t->c_ispeed <= 4800
1841 ? FIFO_ENABLE : FIFO_ENABLE | FIFO_RX_MEDH;
1842 #ifdef COM_ESP
1843 /*
1844 * The Hayes ESP card needs the fifo DMA mode bit set
1845 * in compatibility mode. If not, it will interrupt
1846 * for each character received.
1847 */
1848 if (com->esp)
1849 com->fifo_image |= FIFO_DMA_MODE;
1850 #endif
1851 sio_setreg(com, com_fifo, com->fifo_image);
1852 }
1853
1854 /*
1855 * This returns with interrupts disabled so that we can complete
1856 * the speed change atomically. Keeping interrupts disabled is
1857 * especially important while com_data is hidden.
1858 */
1859 (void) siosetwater(com, t->c_ispeed);
1860
1861 sio_setreg(com, com_cfcr, cfcr | CFCR_DLAB);
1862 /*
1863 * Only set the divisor registers if they would change, since on
1864 * some 16550 incompatibles (UMC8669F), setting them while input
1865 * is arriving loses sync until data stops arriving.
1866 */
1867 dlbl = divisor & 0xFF;
1868 if (sio_getreg(com, com_dlbl) != dlbl)
1869 sio_setreg(com, com_dlbl, dlbl);
1870 dlbh = divisor >> 8;
1871 if (sio_getreg(com, com_dlbh) != dlbh)
1872 sio_setreg(com, com_dlbh, dlbh);
1873
1874 efr_flowbits = 0;
1875
1876 if (cflag & CRTS_IFLOW) {
1877 com->state |= CS_RTS_IFLOW;
1878 efr_flowbits |= EFR_AUTORTS;
1879 /*
1880 * If CS_RTS_IFLOW just changed from off to on, the change
1881 * needs to be propagated to MCR_RTS. This isn't urgent,
1882 * so do it later by calling comstart() instead of repeating
1883 * a lot of code from comstart() here.
1884 */
1885 } else if (com->state & CS_RTS_IFLOW) {
1886 com->state &= ~CS_RTS_IFLOW;
1887 /*
1888 * CS_RTS_IFLOW just changed from on to off. Force MCR_RTS
1889 * on here, since comstart() won't do it later.
1890 */
1891 outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS);
1892 }
1893
1894 /*
1895 * Set up state to handle output flow control.
1896 * XXX - worth handling MDMBUF (DCD) flow control at the lowest level?
1897 * Now has 10+ msec latency, while CTS flow has 50- usec latency.
1898 */
1899 com->state |= CS_ODEVREADY;
1900 com->state &= ~CS_CTS_OFLOW;
1901 if (cflag & CCTS_OFLOW) {
1902 com->state |= CS_CTS_OFLOW;
1903 efr_flowbits |= EFR_AUTOCTS;
1904 if (!(com->last_modem_status & MSR_CTS))
1905 com->state &= ~CS_ODEVREADY;
1906 }
1907
1908 if (com->st16650a) {
1909 sio_setreg(com, com_lcr, LCR_EFR_ENABLE);
1910 sio_setreg(com, com_efr,
1911 (sio_getreg(com, com_efr)
1912 & ~(EFR_AUTOCTS | EFR_AUTORTS)) | efr_flowbits);
1913 }
1914 sio_setreg(com, com_cfcr, com->cfcr_image = cfcr);
1915
1916 /* XXX shouldn't call functions while intrs are disabled. */
1917 ttyldoptim(tp);
1918
1919 mtx_unlock_spin(&sio_lock);
1920 splx(s);
1921 comstart(tp);
1922 if (com->ibufold != NULL) {
1923 free(com->ibufold, M_DEVBUF);
1924 com->ibufold = NULL;
1925 }
1926 return (0);
1927 }
1928
1929 /*
1930 * This function must be called with the sio_lock mutex released and will
1931 * return with it obtained.
1932 */
1933 static int
siosetwater(com,speed)1934 siosetwater(com, speed)
1935 struct com_s *com;
1936 speed_t speed;
1937 {
1938 int cp4ticks;
1939 u_char *ibuf;
1940 int ibufsize;
1941 struct tty *tp;
1942
1943 /*
1944 * Make the buffer size large enough to handle a softtty interrupt
1945 * latency of about 2 ticks without loss of throughput or data
1946 * (about 3 ticks if input flow control is not used or not honoured,
1947 * but a bit less for CS5-CS7 modes).
1948 */
1949 cp4ticks = speed / 10 / hz * 4;
1950 for (ibufsize = 128; ibufsize < cp4ticks;)
1951 ibufsize <<= 1;
1952 if (ibufsize == com->ibufsize) {
1953 mtx_lock_spin(&sio_lock);
1954 return (0);
1955 }
1956
1957 /*
1958 * Allocate input buffer. The extra factor of 2 in the size is
1959 * to allow for an error byte for each input byte.
1960 */
1961 ibuf = malloc(2 * ibufsize, M_DEVBUF, M_NOWAIT);
1962 if (ibuf == NULL) {
1963 mtx_lock_spin(&sio_lock);
1964 return (ENOMEM);
1965 }
1966
1967 /* Initialize non-critical variables. */
1968 com->ibufold = com->ibuf;
1969 com->ibufsize = ibufsize;
1970 tp = com->tp;
1971 if (tp != NULL) {
1972 tp->t_ififosize = 2 * ibufsize;
1973 tp->t_ispeedwat = (speed_t)-1;
1974 tp->t_ospeedwat = (speed_t)-1;
1975 }
1976
1977 /*
1978 * Read current input buffer, if any. Continue with interrupts
1979 * disabled.
1980 */
1981 mtx_lock_spin(&sio_lock);
1982 if (com->iptr != com->ibuf)
1983 sioinput(com);
1984
1985 /*-
1986 * Initialize critical variables, including input buffer watermarks.
1987 * The external device is asked to stop sending when the buffer
1988 * exactly reaches high water, or when the high level requests it.
1989 * The high level is notified immediately (rather than at a later
1990 * clock tick) when this watermark is reached.
1991 * The buffer size is chosen so the watermark should almost never
1992 * be reached.
1993 * The low watermark is invisibly 0 since the buffer is always
1994 * emptied all at once.
1995 */
1996 com->iptr = com->ibuf = ibuf;
1997 com->ibufend = ibuf + ibufsize;
1998 com->ierroff = ibufsize;
1999 com->ihighwater = ibuf + 3 * ibufsize / 4;
2000 return (0);
2001 }
2002
2003 static void
comstart(tp)2004 comstart(tp)
2005 struct tty *tp;
2006 {
2007 struct com_s *com;
2008 int s;
2009
2010 com = tp->t_sc;
2011 if (com == NULL)
2012 return;
2013 s = spltty();
2014 mtx_lock_spin(&sio_lock);
2015 if (tp->t_state & TS_TTSTOP)
2016 com->state &= ~CS_TTGO;
2017 else
2018 com->state |= CS_TTGO;
2019 if (tp->t_state & TS_TBLOCK) {
2020 if (com->mcr_image & MCR_RTS && com->state & CS_RTS_IFLOW)
2021 outb(com->modem_ctl_port, com->mcr_image &= ~MCR_RTS);
2022 } else {
2023 if (!(com->mcr_image & MCR_RTS) && com->iptr < com->ihighwater
2024 && com->state & CS_RTS_IFLOW)
2025 outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS);
2026 }
2027 mtx_unlock_spin(&sio_lock);
2028 if (tp->t_state & (TS_TIMEOUT | TS_TTSTOP)) {
2029 ttwwakeup(tp);
2030 splx(s);
2031 return;
2032 }
2033 if (tp->t_outq.c_cc != 0) {
2034 struct lbq *qp;
2035 struct lbq *next;
2036
2037 if (!com->obufs[0].l_queued) {
2038 com->obufs[0].l_tail
2039 = com->obuf1 + q_to_b(&tp->t_outq, com->obuf1,
2040 sizeof com->obuf1);
2041 com->obufs[0].l_next = NULL;
2042 com->obufs[0].l_queued = TRUE;
2043 mtx_lock_spin(&sio_lock);
2044 if (com->state & CS_BUSY) {
2045 qp = com->obufq.l_next;
2046 while ((next = qp->l_next) != NULL)
2047 qp = next;
2048 qp->l_next = &com->obufs[0];
2049 } else {
2050 com->obufq.l_head = com->obufs[0].l_head;
2051 com->obufq.l_tail = com->obufs[0].l_tail;
2052 com->obufq.l_next = &com->obufs[0];
2053 com->state |= CS_BUSY;
2054 }
2055 mtx_unlock_spin(&sio_lock);
2056 }
2057 if (tp->t_outq.c_cc != 0 && !com->obufs[1].l_queued) {
2058 com->obufs[1].l_tail
2059 = com->obuf2 + q_to_b(&tp->t_outq, com->obuf2,
2060 sizeof com->obuf2);
2061 com->obufs[1].l_next = NULL;
2062 com->obufs[1].l_queued = TRUE;
2063 mtx_lock_spin(&sio_lock);
2064 if (com->state & CS_BUSY) {
2065 qp = com->obufq.l_next;
2066 while ((next = qp->l_next) != NULL)
2067 qp = next;
2068 qp->l_next = &com->obufs[1];
2069 } else {
2070 com->obufq.l_head = com->obufs[1].l_head;
2071 com->obufq.l_tail = com->obufs[1].l_tail;
2072 com->obufq.l_next = &com->obufs[1];
2073 com->state |= CS_BUSY;
2074 }
2075 mtx_unlock_spin(&sio_lock);
2076 }
2077 tp->t_state |= TS_BUSY;
2078 }
2079 mtx_lock_spin(&sio_lock);
2080 if (com->state >= (CS_BUSY | CS_TTGO))
2081 siointr1(com); /* fake interrupt to start output */
2082 mtx_unlock_spin(&sio_lock);
2083 ttwwakeup(tp);
2084 splx(s);
2085 }
2086
2087 static void
comstop(tp,rw)2088 comstop(tp, rw)
2089 struct tty *tp;
2090 int rw;
2091 {
2092 struct com_s *com;
2093
2094 com = tp->t_sc;
2095 if (com == NULL || com->gone)
2096 return;
2097 mtx_lock_spin(&sio_lock);
2098 if (rw & FWRITE) {
2099 if (com->hasfifo)
2100 #ifdef COM_ESP
2101 /* XXX avoid h/w bug. */
2102 if (!com->esp)
2103 #endif
2104 sio_setreg(com, com_fifo,
2105 FIFO_XMT_RST | com->fifo_image);
2106 com->obufs[0].l_queued = FALSE;
2107 com->obufs[1].l_queued = FALSE;
2108 if (com->state & CS_ODONE)
2109 com_events -= LOTS_OF_EVENTS;
2110 com->state &= ~(CS_ODONE | CS_BUSY);
2111 com->tp->t_state &= ~TS_BUSY;
2112 }
2113 if (rw & FREAD) {
2114 if (com->hasfifo)
2115 #ifdef COM_ESP
2116 /* XXX avoid h/w bug. */
2117 if (!com->esp)
2118 #endif
2119 sio_setreg(com, com_fifo,
2120 FIFO_RCV_RST | com->fifo_image);
2121 com_events -= (com->iptr - com->ibuf);
2122 com->iptr = com->ibuf;
2123 }
2124 mtx_unlock_spin(&sio_lock);
2125 comstart(tp);
2126 }
2127
2128 static int
commodem(struct tty * tp,int sigon,int sigoff)2129 commodem(struct tty *tp, int sigon, int sigoff)
2130 {
2131 struct com_s *com;
2132 int bitand, bitor, msr;
2133
2134 com = tp->t_sc;
2135 if (com->gone)
2136 return(0);
2137 if (sigon != 0 || sigoff != 0) {
2138 bitand = bitor = 0;
2139 if (sigoff & SER_DTR)
2140 bitand |= MCR_DTR;
2141 if (sigoff & SER_RTS)
2142 bitand |= MCR_RTS;
2143 if (sigon & SER_DTR)
2144 bitor |= MCR_DTR;
2145 if (sigon & SER_RTS)
2146 bitor |= MCR_RTS;
2147 bitand = ~bitand;
2148 mtx_lock_spin(&sio_lock);
2149 com->mcr_image &= bitand;
2150 com->mcr_image |= bitor;
2151 outb(com->modem_ctl_port, com->mcr_image);
2152 mtx_unlock_spin(&sio_lock);
2153 return (0);
2154 } else {
2155 bitor = 0;
2156 if (com->mcr_image & MCR_DTR)
2157 bitor |= SER_DTR;
2158 if (com->mcr_image & MCR_RTS)
2159 bitor |= SER_RTS;
2160 msr = com->prev_modem_status;
2161 if (msr & MSR_CTS)
2162 bitor |= SER_CTS;
2163 if (msr & MSR_DCD)
2164 bitor |= SER_DCD;
2165 if (msr & MSR_DSR)
2166 bitor |= SER_DSR;
2167 if (msr & MSR_DSR)
2168 bitor |= SER_DSR;
2169 if (msr & (MSR_RI | MSR_TERI))
2170 bitor |= SER_RI;
2171 return (bitor);
2172 }
2173 }
2174
2175 static void
siosettimeout()2176 siosettimeout()
2177 {
2178 struct com_s *com;
2179 bool_t someopen;
2180 int unit;
2181
2182 /*
2183 * Set our timeout period to 1 second if no polled devices are open.
2184 * Otherwise set it to max(1/200, 1/hz).
2185 * Enable timeouts iff some device is open.
2186 */
2187 untimeout(comwakeup, (void *)NULL, sio_timeout_handle);
2188 sio_timeout = hz;
2189 someopen = FALSE;
2190 for (unit = 0; unit < sio_numunits; ++unit) {
2191 com = com_addr(unit);
2192 if (com != NULL && com->tp != NULL
2193 && com->tp->t_state & TS_ISOPEN && !com->gone) {
2194 someopen = TRUE;
2195 if (com->poll || com->poll_output) {
2196 sio_timeout = hz > 200 ? hz / 200 : 1;
2197 break;
2198 }
2199 }
2200 }
2201 if (someopen) {
2202 sio_timeouts_until_log = hz / sio_timeout;
2203 sio_timeout_handle = timeout(comwakeup, (void *)NULL,
2204 sio_timeout);
2205 } else {
2206 /* Flush error messages, if any. */
2207 sio_timeouts_until_log = 1;
2208 comwakeup((void *)NULL);
2209 untimeout(comwakeup, (void *)NULL, sio_timeout_handle);
2210 }
2211 }
2212
2213 static void
comwakeup(chan)2214 comwakeup(chan)
2215 void *chan;
2216 {
2217 struct com_s *com;
2218 int unit;
2219
2220 sio_timeout_handle = timeout(comwakeup, (void *)NULL, sio_timeout);
2221
2222 /*
2223 * Recover from lost output interrupts.
2224 * Poll any lines that don't use interrupts.
2225 */
2226 for (unit = 0; unit < sio_numunits; ++unit) {
2227 com = com_addr(unit);
2228 if (com != NULL && !com->gone
2229 && (com->state >= (CS_BUSY | CS_TTGO) || com->poll)) {
2230 mtx_lock_spin(&sio_lock);
2231 siointr1(com);
2232 mtx_unlock_spin(&sio_lock);
2233 }
2234 }
2235
2236 /*
2237 * Check for and log errors, but not too often.
2238 */
2239 if (--sio_timeouts_until_log > 0)
2240 return;
2241 sio_timeouts_until_log = hz / sio_timeout;
2242 for (unit = 0; unit < sio_numunits; ++unit) {
2243 int errnum;
2244
2245 com = com_addr(unit);
2246 if (com == NULL)
2247 continue;
2248 if (com->gone)
2249 continue;
2250 for (errnum = 0; errnum < CE_NTYPES; ++errnum) {
2251 u_int delta;
2252 u_long total;
2253
2254 mtx_lock_spin(&sio_lock);
2255 delta = com->delta_error_counts[errnum];
2256 com->delta_error_counts[errnum] = 0;
2257 mtx_unlock_spin(&sio_lock);
2258 if (delta == 0)
2259 continue;
2260 total = com->error_counts[errnum] += delta;
2261 log(LOG_ERR, "sio%d: %u more %s%s (total %lu)\n",
2262 unit, delta, error_desc[errnum],
2263 delta == 1 ? "" : "s", total);
2264 }
2265 }
2266 }
2267
2268 /*
2269 * Following are all routines needed for SIO to act as console
2270 */
2271 struct siocnstate {
2272 u_char dlbl;
2273 u_char dlbh;
2274 u_char ier;
2275 u_char cfcr;
2276 u_char mcr;
2277 };
2278
2279 /*
2280 * This is a function in order to not replicate "ttyd%d" more
2281 * places than absolutely necessary.
2282 */
2283 static void
siocnset(struct consdev * cd,int unit)2284 siocnset(struct consdev *cd, int unit)
2285 {
2286
2287 cd->cn_unit = unit;
2288 sprintf(cd->cn_name, "ttyd%d", unit);
2289 }
2290
2291 static speed_t siocngetspeed(Port_t, u_long rclk);
2292 static void siocnclose(struct siocnstate *sp, Port_t iobase);
2293 static void siocnopen(struct siocnstate *sp, Port_t iobase, int speed);
2294 static void siocntxwait(Port_t iobase);
2295
2296 static cn_probe_t sio_cnprobe;
2297 static cn_init_t sio_cninit;
2298 static cn_term_t sio_cnterm;
2299 static cn_getc_t sio_cngetc;
2300 static cn_putc_t sio_cnputc;
2301 static cn_grab_t sio_cngrab;
2302 static cn_ungrab_t sio_cnungrab;
2303
2304 CONSOLE_DRIVER(sio);
2305
2306 static void
siocntxwait(iobase)2307 siocntxwait(iobase)
2308 Port_t iobase;
2309 {
2310 int timo;
2311
2312 /*
2313 * Wait for any pending transmission to finish. Required to avoid
2314 * the UART lockup bug when the speed is changed, and for normal
2315 * transmits.
2316 */
2317 timo = 100000;
2318 while ((inb(iobase + com_lsr) & (LSR_TSRE | LSR_TXRDY))
2319 != (LSR_TSRE | LSR_TXRDY) && --timo != 0)
2320 ;
2321 }
2322
2323 /*
2324 * Read the serial port specified and try to figure out what speed
2325 * it's currently running at. We're assuming the serial port has
2326 * been initialized and is basically idle. This routine is only intended
2327 * to be run at system startup.
2328 *
2329 * If the value read from the serial port doesn't make sense, return 0.
2330 */
2331
2332 static speed_t
siocngetspeed(iobase,rclk)2333 siocngetspeed(iobase, rclk)
2334 Port_t iobase;
2335 u_long rclk;
2336 {
2337 u_int divisor;
2338 u_char dlbh;
2339 u_char dlbl;
2340 u_char cfcr;
2341
2342 cfcr = inb(iobase + com_cfcr);
2343 outb(iobase + com_cfcr, CFCR_DLAB | cfcr);
2344
2345 dlbl = inb(iobase + com_dlbl);
2346 dlbh = inb(iobase + com_dlbh);
2347
2348 outb(iobase + com_cfcr, cfcr);
2349
2350 divisor = dlbh << 8 | dlbl;
2351
2352 /* XXX there should be more sanity checking. */
2353 if (divisor == 0)
2354 return (CONSPEED);
2355 return (rclk / (16UL * divisor));
2356 }
2357
2358 static void
siocnopen(sp,iobase,speed)2359 siocnopen(sp, iobase, speed)
2360 struct siocnstate *sp;
2361 Port_t iobase;
2362 int speed;
2363 {
2364 u_int divisor;
2365 u_char dlbh;
2366 u_char dlbl;
2367
2368 /*
2369 * Save all the device control registers except the fifo register
2370 * and set our default ones (cs8 -parenb speed=comdefaultrate).
2371 * We can't save the fifo register since it is read-only.
2372 */
2373 sp->ier = inb(iobase + com_ier);
2374 outb(iobase + com_ier, 0); /* spltty() doesn't stop siointr() */
2375 siocntxwait(iobase);
2376 sp->cfcr = inb(iobase + com_cfcr);
2377 outb(iobase + com_cfcr, CFCR_DLAB | CFCR_8BITS);
2378 sp->dlbl = inb(iobase + com_dlbl);
2379 sp->dlbh = inb(iobase + com_dlbh);
2380 /*
2381 * Only set the divisor registers if they would change, since on
2382 * some 16550 incompatibles (Startech), setting them clears the
2383 * data input register. This also reduces the effects of the
2384 * UMC8669F bug.
2385 */
2386 divisor = siodivisor(comdefaultrclk, speed);
2387 dlbl = divisor & 0xFF;
2388 if (sp->dlbl != dlbl)
2389 outb(iobase + com_dlbl, dlbl);
2390 dlbh = divisor >> 8;
2391 if (sp->dlbh != dlbh)
2392 outb(iobase + com_dlbh, dlbh);
2393 outb(iobase + com_cfcr, CFCR_8BITS);
2394 sp->mcr = inb(iobase + com_mcr);
2395 /*
2396 * We don't want interrupts, but must be careful not to "disable"
2397 * them by clearing the MCR_IENABLE bit, since that might cause
2398 * an interrupt by floating the IRQ line.
2399 */
2400 outb(iobase + com_mcr, (sp->mcr & MCR_IENABLE) | MCR_DTR | MCR_RTS);
2401 }
2402
2403 static void
siocnclose(sp,iobase)2404 siocnclose(sp, iobase)
2405 struct siocnstate *sp;
2406 Port_t iobase;
2407 {
2408 /*
2409 * Restore the device control registers.
2410 */
2411 siocntxwait(iobase);
2412 outb(iobase + com_cfcr, CFCR_DLAB | CFCR_8BITS);
2413 if (sp->dlbl != inb(iobase + com_dlbl))
2414 outb(iobase + com_dlbl, sp->dlbl);
2415 if (sp->dlbh != inb(iobase + com_dlbh))
2416 outb(iobase + com_dlbh, sp->dlbh);
2417 outb(iobase + com_cfcr, sp->cfcr);
2418 /*
2419 * XXX damp oscillations of MCR_DTR and MCR_RTS by not restoring them.
2420 */
2421 outb(iobase + com_mcr, sp->mcr | MCR_DTR | MCR_RTS);
2422 outb(iobase + com_ier, sp->ier);
2423 }
2424
2425 static void
sio_cnprobe(cp)2426 sio_cnprobe(cp)
2427 struct consdev *cp;
2428 {
2429 speed_t boot_speed;
2430 u_char cfcr;
2431 u_int divisor;
2432 int s, unit;
2433 struct siocnstate sp;
2434
2435 /*
2436 * Find our first enabled console, if any. If it is a high-level
2437 * console device, then initialize it and return successfully.
2438 * If it is a low-level console device, then initialize it and
2439 * return unsuccessfully. It must be initialized in both cases
2440 * for early use by console drivers and debuggers. Initializing
2441 * the hardware is not necessary in all cases, since the i/o
2442 * routines initialize it on the fly, but it is necessary if
2443 * input might arrive while the hardware is switched back to an
2444 * uninitialized state. We can't handle multiple console devices
2445 * yet because our low-level routines don't take a device arg.
2446 * We trust the user to set the console flags properly so that we
2447 * don't need to probe.
2448 */
2449 cp->cn_pri = CN_DEAD;
2450
2451 for (unit = 0; unit < 16; unit++) { /* XXX need to know how many */
2452 int flags;
2453
2454 if (resource_disabled("sio", unit))
2455 continue;
2456 if (resource_int_value("sio", unit, "flags", &flags))
2457 continue;
2458 if (COM_CONSOLE(flags) || COM_DEBUGGER(flags)) {
2459 int port;
2460 Port_t iobase;
2461
2462 if (resource_int_value("sio", unit, "port", &port))
2463 continue;
2464 iobase = port;
2465 s = spltty();
2466 if ((boothowto & RB_SERIAL) && COM_CONSOLE(flags)) {
2467 boot_speed =
2468 siocngetspeed(iobase, comdefaultrclk);
2469 if (boot_speed)
2470 comdefaultrate = boot_speed;
2471 }
2472
2473 /*
2474 * Initialize the divisor latch. We can't rely on
2475 * siocnopen() to do this the first time, since it
2476 * avoids writing to the latch if the latch appears
2477 * to have the correct value. Also, if we didn't
2478 * just read the speed from the hardware, then we
2479 * need to set the speed in hardware so that
2480 * switching it later is null.
2481 */
2482 cfcr = inb(iobase + com_cfcr);
2483 outb(iobase + com_cfcr, CFCR_DLAB | cfcr);
2484 divisor = siodivisor(comdefaultrclk, comdefaultrate);
2485 outb(iobase + com_dlbl, divisor & 0xff);
2486 outb(iobase + com_dlbh, divisor >> 8);
2487 outb(iobase + com_cfcr, cfcr);
2488
2489 siocnopen(&sp, iobase, comdefaultrate);
2490
2491 splx(s);
2492 if (COM_CONSOLE(flags) && !COM_LLCONSOLE(flags)) {
2493 siocnset(cp, unit);
2494 cp->cn_pri = COM_FORCECONSOLE(flags)
2495 || boothowto & RB_SERIAL
2496 ? CN_REMOTE : CN_NORMAL;
2497 siocniobase = iobase;
2498 siocnunit = unit;
2499 }
2500 #ifdef GDB
2501 if (COM_DEBUGGER(flags))
2502 siogdbiobase = iobase;
2503 #endif
2504 }
2505 }
2506 }
2507
2508 static void
sio_cninit(cp)2509 sio_cninit(cp)
2510 struct consdev *cp;
2511 {
2512 comconsole = cp->cn_unit;
2513 }
2514
2515 static void
sio_cnterm(cp)2516 sio_cnterm(cp)
2517 struct consdev *cp;
2518 {
2519 comconsole = -1;
2520 }
2521
2522 static void
sio_cngrab(struct consdev * cp)2523 sio_cngrab(struct consdev *cp)
2524 {
2525 }
2526
2527 static void
sio_cnungrab(struct consdev * cp)2528 sio_cnungrab(struct consdev *cp)
2529 {
2530 }
2531
2532 static int
sio_cngetc(struct consdev * cd)2533 sio_cngetc(struct consdev *cd)
2534 {
2535 int c;
2536 Port_t iobase;
2537 int s;
2538 struct siocnstate sp;
2539 speed_t speed;
2540
2541 if (cd != NULL && cd->cn_unit == siocnunit) {
2542 iobase = siocniobase;
2543 speed = comdefaultrate;
2544 } else {
2545 #ifdef GDB
2546 iobase = siogdbiobase;
2547 speed = gdbdefaultrate;
2548 #else
2549 return (-1);
2550 #endif
2551 }
2552 s = spltty();
2553 siocnopen(&sp, iobase, speed);
2554 if (inb(iobase + com_lsr) & LSR_RXRDY)
2555 c = inb(iobase + com_data);
2556 else
2557 c = -1;
2558 siocnclose(&sp, iobase);
2559 splx(s);
2560 return (c);
2561 }
2562
2563 static void
sio_cnputc(struct consdev * cd,int c)2564 sio_cnputc(struct consdev *cd, int c)
2565 {
2566 int need_unlock;
2567 int s;
2568 struct siocnstate sp;
2569 Port_t iobase;
2570 speed_t speed;
2571
2572 if (cd != NULL && cd->cn_unit == siocnunit) {
2573 iobase = siocniobase;
2574 speed = comdefaultrate;
2575 } else {
2576 #ifdef GDB
2577 iobase = siogdbiobase;
2578 speed = gdbdefaultrate;
2579 #else
2580 return;
2581 #endif
2582 }
2583 s = spltty();
2584 need_unlock = 0;
2585 if (!kdb_active && sio_inited == 2 && !mtx_owned(&sio_lock)) {
2586 mtx_lock_spin(&sio_lock);
2587 need_unlock = 1;
2588 }
2589 siocnopen(&sp, iobase, speed);
2590 siocntxwait(iobase);
2591 outb(iobase + com_data, c);
2592 siocnclose(&sp, iobase);
2593 if (need_unlock)
2594 mtx_unlock_spin(&sio_lock);
2595 splx(s);
2596 }
2597
2598 /*
2599 * Remote gdb(1) support.
2600 */
2601
2602 #if defined(GDB)
2603
2604 #include <gdb/gdb.h>
2605
2606 static gdb_probe_f siogdbprobe;
2607 static gdb_init_f siogdbinit;
2608 static gdb_term_f siogdbterm;
2609 static gdb_getc_f siogdbgetc;
2610 static gdb_putc_f siogdbputc;
2611
2612 GDB_DBGPORT(sio, siogdbprobe, siogdbinit, siogdbterm, siogdbgetc, siogdbputc);
2613
2614 static int
siogdbprobe(void)2615 siogdbprobe(void)
2616 {
2617 return ((siogdbiobase != 0) ? 0 : -1);
2618 }
2619
2620 static void
siogdbinit(void)2621 siogdbinit(void)
2622 {
2623 }
2624
2625 static void
siogdbterm(void)2626 siogdbterm(void)
2627 {
2628 }
2629
2630 static void
siogdbputc(int c)2631 siogdbputc(int c)
2632 {
2633 sio_cnputc(NULL, c);
2634 }
2635
2636 static int
siogdbgetc(void)2637 siogdbgetc(void)
2638 {
2639 return (sio_cngetc(NULL));
2640 }
2641
2642 #endif
2643