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sys: Some whitespace cleanup.
[dragonfly.git] / sys / dev / serial / sio / sio.c
blob4588eb9f0ccdcb02fde1761de0dfdd1217c6317b
1 /*-
2 * (MPSAFE)
3 *
4 * Copyright (c) 1991 The Regents of the University of California.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * $FreeBSD: src/sys/isa/sio.c,v 1.291.2.35 2003/05/18 08:51:15 murray Exp $
32 * from: @(#)com.c 7.5 (Berkeley) 5/16/91
33 * from: i386/isa sio.c,v 1.234
34 */
35
36 #include "opt_comconsole.h"
37 #include "opt_ddb.h"
38 #include "opt_sio.h"
39 #include "use_pci.h"
40 #include "use_puc.h"
41
42 /*
43 * Serial driver, based on 386BSD-0.1 com driver.
44 * Mostly rewritten to use pseudo-DMA.
45 * Works for National Semiconductor NS8250-NS16550AF UARTs.
46 * COM driver, based on HP dca driver.
47 *
48 * Changes for PC-Card integration:
49 * - Added PC-Card driver table and handlers
50 */
51 #include <sys/param.h>
52 #include <sys/systm.h>
53 #include <sys/reboot.h>
54 #include <sys/malloc.h>
55 #include <sys/tty.h>
56 #include <sys/proc.h>
57 #include <sys/priv.h>
58 #include <sys/module.h>
59 #include <sys/conf.h>
60 #include <sys/dkstat.h>
61 #include <sys/fcntl.h>
62 #include <sys/interrupt.h>
63 #include <sys/kernel.h>
64 #include <sys/syslog.h>
65 #include <sys/sysctl.h>
66 #include <sys/bus.h>
67 #include <sys/rman.h>
68 #include <sys/timepps.h>
69 #include <sys/thread2.h>
70 #include <sys/devfs.h>
71 #include <sys/consio.h>
72
73 #include <machine/limits.h>
74
75 #include <bus/isa/isareg.h>
76 #include <bus/isa/isavar.h>
77 #if NPCI > 0
78 #include <bus/pci/pcireg.h>
79 #include <bus/pci/pcivar.h>
80 #endif
81 #if NPUC > 0
82 #include <dev/misc/puc/pucvar.h>
83 #endif
84 #include <machine/lock.h>
85
86 #include <machine/clock.h>
87
88 #include "sioreg.h"
89 #include "sio_private.h"
90
91 #ifdef COM_ESP
92 #include "../ic_layer/esp.h"
93 #endif
94
95 #define LOTS_OF_EVENTS 64 /* helps separate urgent events from input */
96
97 #define CALLOUT_MASK 0x80
98 #define CONTROL_MASK 0x60
99 #define CONTROL_INIT_STATE 0x20
100 #define CONTROL_LOCK_STATE 0x40
101 #define DEV_TO_UNIT(dev) (MINOR_TO_UNIT(minor(dev)))
102 #define MINOR_TO_UNIT(mynor) ((((mynor) & ~0xffffU) >> (8 + 3)) \
103 | ((mynor) & 0x1f))
104 #define UNIT_TO_MINOR(unit) ((((unit) & ~0x1fU) << (8 + 3)) \
105 | ((unit) & 0x1f))
106
107 #define com_scr 7 /* scratch register for 16450-16550 (R/W) */
108
109 #define sio_getreg(com, off) \
110 (bus_space_read_1((com)->bst, (com)->bsh, (off)))
111 #define sio_setreg(com, off, value) \
112 (bus_space_write_1((com)->bst, (com)->bsh, (off), (value)))
113
114 /*
115 * com state bits.
116 * (CS_BUSY | CS_TTGO) and (CS_BUSY | CS_TTGO | CS_ODEVREADY) must be higher
117 * than the other bits so that they can be tested as a group without masking
118 * off the low bits.
119 *
120 * The following com and tty flags correspond closely:
121 * CS_BUSY = TS_BUSY (maintained by comstart(), siopoll() and
122 * comstop())
123 * CS_TTGO = ~TS_TTSTOP (maintained by comparam() and comstart())
124 * CS_CTS_OFLOW = CCTS_OFLOW (maintained by comparam())
125 * CS_RTS_IFLOW = CRTS_IFLOW (maintained by comparam())
126 * TS_FLUSH is not used.
127 * XXX I think TIOCSETA doesn't clear TS_TTSTOP when it clears IXON.
128 * XXX CS_*FLOW should be CF_*FLOW in com->flags (control flags not state).
129 */
130 #define CS_BUSY 0x80 /* output in progress */
131 #define CS_TTGO 0x40 /* output not stopped by XOFF */
132 #define CS_ODEVREADY 0x20 /* external device h/w ready (CTS) */
133 #define CS_CHECKMSR 1 /* check of MSR scheduled */
134 #define CS_CTS_OFLOW 2 /* use CTS output flow control */
135 #define CS_DTR_OFF 0x10 /* DTR held off */
136 #define CS_ODONE 4 /* output completed */
137 #define CS_RTS_IFLOW 8 /* use RTS input flow control */
138 #define CSE_BUSYCHECK 1 /* siobusycheck() scheduled */
139
140 static char const * const error_desc[] = {
141 #define CE_OVERRUN 0
142 "silo overflow",
143 #define CE_INTERRUPT_BUF_OVERFLOW 1
144 "interrupt-level buffer overflow",
145 #define CE_TTY_BUF_OVERFLOW 2
146 "tty-level buffer overflow",
147 };
148
149 #ifdef COM_ESP
150 static int espattach (struct com_s *com, Port_t esp_port);
151 #endif
152 static int sio_isa_attach (device_t dev);
153
154 static timeout_t siobusycheck;
155 static u_int siodivisor (u_long rclk, speed_t speed);
156 static timeout_t siodtrwakeup;
157 static void comhardclose (struct com_s *com);
158 static void sioinput (struct com_s *com);
159 static void siointr1 (struct com_s *com);
160 static void siointr (void *arg);
161 static int commctl (struct com_s *com, int bits, int how);
162 static int comparam (struct tty *tp, struct termios *t);
163 static inthand2_t siopoll;
164 static int sio_isa_probe (device_t dev);
165 static void siosettimeout (void);
166 static int siosetwater (struct com_s *com, speed_t speed);
167 static void comstart (struct tty *tp);
168 static void comstop (struct tty *tp, int rw);
169 static timeout_t comwakeup;
170 static void disc_optim (struct tty *tp, struct termios *t,
171 struct com_s *com);
172
173 #if NPCI > 0
174 static int sio_pci_attach (device_t dev);
175 static void sio_pci_kludge_unit (device_t dev);
176 static int sio_pci_probe (device_t dev);
177 #endif /* NPCI > 0 */
178
179 #if NPUC > 0
180 static int sio_puc_attach (device_t dev);
181 static int sio_puc_probe (device_t dev);
182 #endif /* NPUC > 0 */
183
184 static char driver_name[] = "sio";
185
186 /* table and macro for fast conversion from a unit number to its com struct */
187 devclass_t sio_devclass;
188 #define com_addr(unit) ((struct com_s *) \
189 devclass_get_softc(sio_devclass, unit))
190
191 static device_method_t sio_isa_methods[] = {
192 /* Device interface */
193 DEVMETHOD(device_probe, sio_isa_probe),
194 DEVMETHOD(device_attach, sio_isa_attach),
195
196 DEVMETHOD_END
197 };
198
199 static driver_t sio_isa_driver = {
200 driver_name,
201 sio_isa_methods,
202 sizeof(struct com_s),
203 };
204
205 #if NPCI > 0
206 static device_method_t sio_pci_methods[] = {
207 /* Device interface */
208 DEVMETHOD(device_probe, sio_pci_probe),
209 DEVMETHOD(device_attach, sio_pci_attach),
210
211 DEVMETHOD_END
212 };
213
214 static driver_t sio_pci_driver = {
215 driver_name,
216 sio_pci_methods,
217 sizeof(struct com_s),
218 };
219 #endif /* NPCI > 0 */
220
221 #if NPUC > 0
222 static device_method_t sio_puc_methods[] = {
223 /* Device interface */
224 DEVMETHOD(device_probe, sio_puc_probe),
225 DEVMETHOD(device_attach, sio_puc_attach),
226
227 DEVMETHOD_END
228 };
229
230 static driver_t sio_puc_driver = {
231 driver_name,
232 sio_puc_methods,
233 sizeof(struct com_s),
234 };
235 #endif /* NPUC > 0 */
236
237 static d_open_t sioopen;
238 static d_close_t sioclose;
239 static d_read_t sioread;
240 static d_write_t siowrite;
241 static d_ioctl_t sioioctl;
242
243 static struct dev_ops sio_ops = {
244 { driver_name, 0, D_TTY },
245 .d_open = sioopen,
246 .d_close = sioclose,
247 .d_read = sioread,
248 .d_write = siowrite,
249 .d_ioctl = sioioctl,
250 .d_kqfilter = ttykqfilter,
251 .d_revoke = ttyrevoke
252 };
253
254 int comconsole = -1;
255 static volatile speed_t comdefaultrate = CONSPEED;
256 static u_long comdefaultrclk = DEFAULT_RCLK;
257 SYSCTL_ULONG(_machdep, OID_AUTO, conrclk, CTLFLAG_RW, &comdefaultrclk, 0, "");
258 static u_int com_events; /* input chars + weighted output completions */
259 static Port_t siocniobase;
260 static int siocnunit;
261 static Port_t siogdbiobase;
262 static int siogdbunit = -1;
263 static bool_t sio_registered;
264 static int sio_timeout;
265 static int sio_timeouts_until_log;
266 static struct callout sio_timeout_handle;
267 static int sio_numunits;
268
269 #ifdef COM_ESP
270 /* XXX configure this properly. */
271 static Port_t likely_com_ports[] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8, };
272 static Port_t likely_esp_ports[] = { 0x140, 0x180, 0x280, 0 };
273 #endif
274
275 /*
276 * handle sysctl read/write requests for console speed
277 *
278 * In addition to setting comdefaultrate for I/O through /dev/console,
279 * also set the initial and lock values for the /dev/ttyXX device
280 * if there is one associated with the console. Finally, if the /dev/tty
281 * device has already been open, change the speed on the open running port
282 * itself.
283 */
284
285 static int
286 sysctl_machdep_comdefaultrate(SYSCTL_HANDLER_ARGS)
287 {
288 int error;
289 speed_t newspeed;
290 struct com_s *com;
291 struct tty *tp;
292
293 lwkt_gettoken(&tty_token);
294 newspeed = comdefaultrate;
295
296 error = sysctl_handle_opaque(oidp, &newspeed, sizeof newspeed, req);
297 if (error || !req->newptr) {
298 lwkt_reltoken(&tty_token);
299 return (error);
300 }
301
302 comdefaultrate = newspeed;
303
304 if (comconsole < 0) { /* serial console not selected? */
305 lwkt_reltoken(&tty_token);
306 return (0);
307 }
308
309 com = com_addr(comconsole);
310 if (com == NULL) {
311 lwkt_reltoken(&tty_token);
312 return (ENXIO);
313 }
314
315 /*
316 * set the initial and lock rates for /dev/ttydXX and /dev/cuaXX
317 * (note, the lock rates really are boolean -- if non-zero, disallow
318 * speed changes)
319 */
320 com->it_in.c_ispeed = com->it_in.c_ospeed =
321 com->lt_in.c_ispeed = com->lt_in.c_ospeed =
322 com->it_out.c_ispeed = com->it_out.c_ospeed =
323 com->lt_out.c_ispeed = com->lt_out.c_ospeed = comdefaultrate;
324
325 /*
326 * if we're open, change the running rate too
327 */
328 tp = com->tp;
329 if (tp && (tp->t_state & TS_ISOPEN)) {
330 tp->t_termios.c_ispeed =
331 tp->t_termios.c_ospeed = comdefaultrate;
332 crit_enter();
333 error = comparam(tp, &tp->t_termios);
334 crit_exit();
335 }
336 lwkt_reltoken(&tty_token);
337 return error;
338 }
339
340 SYSCTL_PROC(_machdep, OID_AUTO, conspeed, CTLTYPE_INT | CTLFLAG_RW,
341 0, 0, sysctl_machdep_comdefaultrate, "I", "");
342
343 #if NPCI > 0
344 struct pci_ids {
345 u_int32_t type;
346 const char *desc;
347 int rid;
348 };
349
350 static struct pci_ids pci_ids[] = {
351 { 0x100812b9, "3COM PCI FaxModem", 0x10 },
352 { 0x2000131f, "CyberSerial (1-port) 16550", 0x10 },
353 { 0x01101407, "Koutech IOFLEX-2S PCI Dual Port Serial", 0x10 },
354 { 0x01111407, "Koutech IOFLEX-2S PCI Dual Port Serial", 0x10 },
355 { 0x048011c1, "Lucent kermit based PCI Modem", 0x14 },
356 { 0x95211415, "Oxford Semiconductor PCI Dual Port Serial", 0x10 },
357 { 0x7101135e, "SeaLevel Ultra 530.PCI Single Port Serial", 0x18 },
358 { 0x0000151f, "SmartLink 5634PCV SurfRider", 0x10 },
359 { 0x98459710, "Netmos Nm9845 PCI Bridge with Dual UART", 0x10 },
360 { 0x8c3d8086, "Intel Lynx Point KT Controller", 0x10 },
361 { 0x9c3d8086, "Intel Lynx Point-LP HECI KT", 0x10 },
362 { 0x8cbd8086, "Intel Wildcat Point KT Controller", 0x10 },
363 { 0x9cbd8086, "Intel Wildcat Point-LP KT Controller", 0x10 },
364 { 0x00000000, NULL, 0 }
365 };
366
367 static int
368 sio_pci_attach(device_t dev)
369 {
370 u_int32_t type;
371 struct pci_ids *id;
372
373 type = pci_get_devid(dev);
374 id = pci_ids;
375 while (id->type && id->type != type)
376 id++;
377 if (id->desc == NULL)
378 return (ENXIO);
379 sio_pci_kludge_unit(dev);
380 return (sioattach(dev, id->rid, 0UL));
381 }
382
383 /*
384 * Don't cut and paste this to other drivers. It is a horrible kludge
385 * which will fail to work and also be unnecessary in future versions.
386 */
387 static void
388 sio_pci_kludge_unit(device_t dev)
389 {
390 devclass_t dc;
391 int err;
392 int start;
393 int unit;
394
395 unit = 0;
396 start = 0;
397 while (resource_int_value("sio", unit, "port", &start) == 0 &&
398 start > 0)
399 unit++;
400 if (device_get_unit(dev) < unit) {
401 dc = device_get_devclass(dev);
402 while (devclass_get_device(dc, unit))
403 unit++;
404 device_printf(dev, "moving to sio%d\n", unit);
405 err = device_set_unit(dev, unit); /* EVIL DO NOT COPY */
406 if (err)
407 device_printf(dev, "error moving device %d\n", err);
408 }
409 }
410
411 static int
412 sio_pci_probe(device_t dev)
413 {
414 u_int32_t type;
415 struct pci_ids *id;
416
417 type = pci_get_devid(dev);
418 id = pci_ids;
419 while (id->type && id->type != type)
420 id++;
421 if (id->desc == NULL)
422 return (ENXIO);
423 device_set_desc(dev, id->desc);
424 return (sioprobe(dev, id->rid, 0UL));
425 }
426 #endif /* NPCI > 0 */
427
428 #if NPUC > 0
429 static int
430 sio_puc_attach(device_t dev)
431 {
432 uintptr_t rclk;
433
434 if (BUS_READ_IVAR(device_get_parent(dev), dev, PUC_IVAR_FREQ,
435 &rclk) != 0)
436 rclk = DEFAULT_RCLK;
437 return (sioattach(dev, 0, rclk));
438 }
439
440 static int
441 sio_puc_probe(device_t dev)
442 {
443 uintptr_t rclk;
444
445 if (BUS_READ_IVAR(device_get_parent(dev), dev, PUC_IVAR_FREQ,
446 &rclk) != 0)
447 rclk = DEFAULT_RCLK;
448 return (sioprobe(dev, 0, rclk));
449 }
450 #endif /* NPUC */
451
452 static struct isa_pnp_id sio_ids[] = {
453 {0x0005d041, "Standard PC COM port"}, /* PNP0500 */
454 {0x0105d041, "16550A-compatible COM port"}, /* PNP0501 */
455 {0x0205d041, "Multiport serial device (non-intelligent 16550)"}, /* PNP0502 */
456 {0x1005d041, "Generic IRDA-compatible device"}, /* PNP0510 */
457 {0x1105d041, "Generic IRDA-compatible device"}, /* PNP0511 */
458 /* Devices that do not have a compatid */
459 {0x12206804, NULL}, /* ACH2012 - 5634BTS 56K Video Ready Modem */
460 {0x7602a904, NULL}, /* AEI0276 - 56K v.90 Fax Modem (LKT) */
461 {0x00007905, NULL}, /* AKY0000 - 56K Plug&Play Modem */
462 {0x21107905, NULL}, /* AKY1021 - 56K Plug&Play Modem */
463 {0x01405407, NULL}, /* AZT4001 - AZT3000 PnP SOUND DEVICE, MODEM */
464 {0x56039008, NULL}, /* BDP0356 - Best Data 56x2 */
465 {0x56159008, NULL}, /* BDP1556 - B.D. Smart One 56SPS,Voice Modem*/
466 {0x36339008, NULL}, /* BDP3336 - Best Data Prods. 336F */
467 {0x0014490a, NULL}, /* BRI1400 - Boca 33.6 PnP */
468 {0x0015490a, NULL}, /* BRI1500 - Internal Fax Data */
469 {0x0034490a, NULL}, /* BRI3400 - Internal ACF Modem */
470 {0x0094490a, NULL}, /* BRI9400 - Boca K56Flex PnP */
471 {0x00b4490a, NULL}, /* BRIB400 - Boca 56k PnP */
472 {0x0030320d, NULL}, /* CIR3000 - Cirrus Logic V43 */
473 {0x0100440e, NULL}, /* CRD0001 - Cardinal MVP288IV ? */
474 {0x01308c0e, NULL}, /* CTL3001 - Creative Labs Phoneblaster */
475 {0x36033610, NULL}, /* DAV0336 - DAVICOM 336PNP MODEM */
476 {0x01009416, NULL}, /* ETT0001 - E-Tech Bullet 33k6 PnP */
477 {0x0000aa1a, NULL}, /* FUJ0000 - FUJITSU Modem 33600 PNP/I2 */
478 {0x1200c31e, NULL}, /* GVC0012 - VF1128HV-R9 (win modem?) */
479 {0x0303c31e, NULL}, /* GVC0303 - MaxTech 33.6 PnP D/F/V */
480 {0x0505c31e, NULL}, /* GVC0505 - GVC 56k Faxmodem */
481 {0x0116c31e, NULL}, /* GVC1601 - Rockwell V.34 Plug & Play Modem */
482 {0x0050c31e, NULL}, /* GVC5000 - some GVC modem */
483 {0x3800f91e, NULL}, /* GWY0038 - Telepath with v.90 */
484 {0x9062f91e, NULL}, /* GWY6290 - Telepath with x2 Technology */
485 {0x8100e425, NULL}, /* IOD0081 - I-O DATA DEVICE,INC. IFML-560 */
486 {0x21002534, NULL}, /* MAE0021 - Jetstream Int V.90 56k Voice Series 2*/
487 {0x0000f435, NULL}, /* MOT0000 - Motorola ModemSURFR 33.6 Intern */
488 {0x5015f435, NULL}, /* MOT1550 - Motorola ModemSURFR 56K Modem */
489 {0xf015f435, NULL}, /* MOT15F0 - Motorola VoiceSURFR 56K Modem */
490 {0x6045f435, NULL}, /* MOT4560 - Motorola ? */
491 {0x61e7a338, NULL}, /* NECE761 - 33.6Modem */
492 {0x08804f3f, NULL}, /* OZO8008 - Zoom (33.6k Modem) */
493 {0x0f804f3f, NULL}, /* OZO800f - Zoom 2812 (56k Modem) */
494 {0x39804f3f, NULL}, /* OZO8039 - Zoom 56k flex */
495 {0x00914f3f, NULL}, /* OZO9100 - Zoom 2919 (K56 Faxmodem) */
496 {0x3024a341, NULL}, /* PMC2430 - Pace 56 Voice Internal Modem */
497 {0x1000eb49, NULL}, /* ROK0010 - Rockwell ? */
498 {0x1200b23d, NULL}, /* RSS0012 - OMRON ME5614ISA */
499 {0x5002734a, NULL}, /* RSS0250 - 5614Jx3(G) Internal Modem */
500 {0x6202734a, NULL}, /* RSS0262 - 5614Jx3[G] V90+K56Flex Modem */
501 {0x1010104d, NULL}, /* SHP1010 - Rockwell 33600bps Modem */
502 {0xc100ad4d, NULL}, /* SMM00C1 - Leopard 56k PnP */
503 {0x9012b04e, NULL}, /* SUP1290 - Supra ? */
504 {0x1013b04e, NULL}, /* SUP1310 - SupraExpress 336i PnP */
505 {0x8013b04e, NULL}, /* SUP1380 - SupraExpress 288i PnP Voice */
506 {0x8113b04e, NULL}, /* SUP1381 - SupraExpress 336i PnP Voice */
507 {0x5016b04e, NULL}, /* SUP1650 - Supra 336i Sp Intl */
508 {0x7016b04e, NULL}, /* SUP1670 - Supra 336i V+ Intl */
509 {0x7420b04e, NULL}, /* SUP2070 - Supra ? */
510 {0x8020b04e, NULL}, /* SUP2080 - Supra ? */
511 {0x8420b04e, NULL}, /* SUP2084 - SupraExpress 56i PnP */
512 {0x7121b04e, NULL}, /* SUP2171 - SupraExpress 56i Sp? */
513 {0x8024b04e, NULL}, /* SUP2480 - Supra ? */
514 {0x01007256, NULL}, /* USR0001 - U.S. Robotics Inc., Sportster W */
515 {0x02007256, NULL}, /* USR0002 - U.S. Robotics Inc. Sportster 33. */
516 {0x04007256, NULL}, /* USR0004 - USR Sportster 14.4k */
517 {0x06007256, NULL}, /* USR0006 - USR Sportster 33.6k */
518 {0x11007256, NULL}, /* USR0011 - USR ? */
519 {0x01017256, NULL}, /* USR0101 - USR ? */
520 {0x30207256, NULL}, /* USR2030 - U.S.Robotics Inc. Sportster 560 */
521 {0x50207256, NULL}, /* USR2050 - U.S.Robotics Inc. Sportster 33. */
522 {0x70207256, NULL}, /* USR2070 - U.S.Robotics Inc. Sportster 560 */
523 {0x30307256, NULL}, /* USR3030 - U.S. Robotics 56K FAX INT */
524 {0x31307256, NULL}, /* USR3031 - U.S. Robotics 56K FAX INT */
525 {0x50307256, NULL}, /* USR3050 - U.S. Robotics 56K FAX INT */
526 {0x70307256, NULL}, /* USR3070 - U.S. Robotics 56K Voice INT */
527 {0x90307256, NULL}, /* USR3090 - USR ? */
528 {0x70917256, NULL}, /* USR9170 - U.S. Robotics 56K FAX INT */
529 {0x90917256, NULL}, /* USR9190 - USR 56k Voice INT */
530 {0x0300695c, NULL}, /* WCI0003 - Fax/Voice/Modem/Speakphone/Asvd */
531 {0x01a0896a, NULL}, /* ZTIA001 - Zoom Internal V90 Faxmodem */
532 {0x61f7896a, NULL}, /* ZTIF761 - Zoom ComStar 33.6 */
533 {0}
534 };
535
536
537
538 static int
539 sio_isa_probe(device_t dev)
540 {
541 /* Check isapnp ids */
542 if (ISA_PNP_PROBE(device_get_parent(dev), dev, sio_ids) == ENXIO)
543 return (ENXIO);
544 return (sioprobe(dev, 0, 0UL));
545 }
546
547 int
548 sioprobe(device_t dev, int xrid, u_long rclk)
549 {
550 #if 0
551 static bool_t already_init;
552 device_t xdev;
553 #endif
554 struct com_s *com;
555 u_int divisor;
556 bool_t failures[10];
557 int fn;
558 device_t idev;
559 Port_t iobase;
560 intrmask_t irqmap[4];
561 intrmask_t irqs;
562 u_char mcr_image;
563 int result;
564 u_long xirq;
565 u_int flags = device_get_flags(dev);
566 int rid;
567 struct resource *port;
568
569 rid = xrid;
570 port = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid,
571 0, ~0, IO_COMSIZE, RF_ACTIVE);
572 if (!port)
573 return (ENXIO);
574
575 lwkt_gettoken(&tty_token);
576 com = device_get_softc(dev);
577 com->bst = rman_get_bustag(port);
578 com->bsh = rman_get_bushandle(port);
579 if (rclk == 0)
580 rclk = DEFAULT_RCLK;
581 com->rclk = rclk;
582
583 #if 0
584 /*
585 * XXX this is broken - when we are first called, there are no
586 * previously configured IO ports. We could hard code
587 * 0x3f8, 0x2f8, 0x3e8, 0x2e8 etc but that's probably worse.
588 * This code has been doing nothing since the conversion since
589 * "count" is zero the first time around.
590 */
591 if (!already_init) {
592 /*
593 * Turn off MCR_IENABLE for all likely serial ports. An unused
594 * port with its MCR_IENABLE gate open will inhibit interrupts
595 * from any used port that shares the interrupt vector.
596 * XXX the gate enable is elsewhere for some multiports.
597 */
598 device_t *devs;
599 int count, i, xioport;
600
601 devclass_get_devices(sio_devclass, &devs, &count);
602 for (i = 0; i < count; i++) {
603 xdev = devs[i];
604 if (device_is_enabled(xdev) &&
605 bus_get_resource(xdev, SYS_RES_IOPORT, 0, &xioport,
606 NULL) == 0)
607 outb(xioport + com_mcr, 0);
608 }
609 kfree(devs, M_TEMP);
610 already_init = TRUE;
611 }
612 #endif
613
614 if (COM_LLCONSOLE(flags)) {
615 kprintf("sio%d: reserved for low-level i/o\n",
616 device_get_unit(dev));
617 bus_release_resource(dev, SYS_RES_IOPORT, rid, port);
618 lwkt_reltoken(&tty_token);
619 return (ENXIO);
620 }
621
622 /*
623 * If the device is on a multiport card and has an AST/4
624 * compatible interrupt control register, initialize this
625 * register and prepare to leave MCR_IENABLE clear in the mcr.
626 * Otherwise, prepare to set MCR_IENABLE in the mcr.
627 * Point idev to the device struct giving the correct id_irq.
628 * This is the struct for the master device if there is one.
629 */
630 idev = dev;
631 mcr_image = MCR_IENABLE;
632 #ifdef COM_MULTIPORT
633 if (COM_ISMULTIPORT(flags)) {
634 Port_t xiobase;
635 u_long io;
636
637 idev = devclass_get_device(sio_devclass, COM_MPMASTER(flags));
638 if (idev == NULL) {
639 kprintf("sio%d: master device %d not configured\n",
640 device_get_unit(dev), COM_MPMASTER(flags));
641 idev = dev;
642 }
643 if (!COM_NOTAST4(flags)) {
644 if (bus_get_resource(idev, SYS_RES_IOPORT, 0, &io,
645 NULL) == 0) {
646 xiobase = io;
647 if (bus_get_resource(idev, SYS_RES_IRQ, 0,
648 NULL, NULL) == 0)
649 outb(xiobase + com_scr, 0x80);
650 else
651 outb(xiobase + com_scr, 0);
652 }
653 mcr_image = 0;
654 }
655 }
656 #endif /* COM_MULTIPORT */
657 if (bus_get_resource(idev, SYS_RES_IRQ, 0, NULL, NULL) != 0)
658 mcr_image = 0;
659
660 bzero(failures, sizeof failures);
661 iobase = rman_get_start(port);
662
663 /*
664 * We don't want to get actual interrupts, just masked ones.
665 * Interrupts from this line should already be masked in the ICU,
666 * but mask them in the processor as well in case there are some
667 * (misconfigured) shared interrupts.
668 */
669 com_lock();
670 /* EXTRA DELAY? */
671
672 /*
673 * For the TI16754 chips, set prescaler to 1 (4 is often the
674 * default after-reset value) as otherwise it's impossible to
675 * get highest baudrates.
676 */
677 if (COM_TI16754(flags)) {
678 u_char cfcr, efr;
679
680 cfcr = sio_getreg(com, com_cfcr);
681 sio_setreg(com, com_cfcr, CFCR_EFR_ENABLE);
682 efr = sio_getreg(com, com_efr);
683 /* Unlock extended features to turn off prescaler. */
684 sio_setreg(com, com_efr, efr | EFR_EFE);
685 /* Disable EFR. */
686 sio_setreg(com, com_cfcr, (cfcr != CFCR_EFR_ENABLE) ? cfcr : 0);
687 /* Turn off prescaler. */
688 sio_setreg(com, com_mcr,
689 sio_getreg(com, com_mcr) & ~MCR_PRESCALE);
690 sio_setreg(com, com_cfcr, CFCR_EFR_ENABLE);
691 sio_setreg(com, com_efr, efr);
692 sio_setreg(com, com_cfcr, cfcr);
693 }
694
695 /*
696 * Initialize the speed and the word size and wait long enough to
697 * drain the maximum of 16 bytes of junk in device output queues.
698 * The speed is undefined after a master reset and must be set
699 * before relying on anything related to output. There may be
700 * junk after a (very fast) soft reboot and (apparently) after
701 * master reset.
702 * XXX what about the UART bug avoided by waiting in comparam()?
703 * We don't want to to wait long enough to drain at 2 bps.
704 */
705 if (iobase == siocniobase) {
706 DELAY((16 + 1) * 1000000 / (comdefaultrate / 10));
707 } else {
708 sio_setreg(com, com_cfcr, CFCR_DLAB | CFCR_8BITS);
709 divisor = siodivisor(rclk, SIO_TEST_SPEED);
710 sio_setreg(com, com_dlbl, divisor & 0xff);
711 sio_setreg(com, com_dlbh, divisor >> 8);
712 sio_setreg(com, com_cfcr, CFCR_8BITS);
713 DELAY((16 + 1) * 1000000 / (SIO_TEST_SPEED / 10));
714 }
715
716 /*
717 * Make sure we can drain the receiver. If we can't, the serial
718 * port may not exist.
719 */
720 for (fn = 0; fn < 256; ++fn) {
721 if ((sio_getreg(com, com_lsr) & LSR_RXRDY) == 0)
722 break;
723 (void)sio_getreg(com, com_data);
724 }
725 if (fn == 256) {
726 com_unlock();
727 lwkt_reltoken(&tty_token);
728 kprintf("sio%d: can't drain, serial port might "
729 "not exist, disabling\n", device_get_unit(dev));
730 return (ENXIO);
731 }
732
733 /*
734 * Enable the interrupt gate and disable device interupts. This
735 * should leave the device driving the interrupt line low and
736 * guarantee an edge trigger if an interrupt can be generated.
737 */
738 /* EXTRA DELAY? */
739 sio_setreg(com, com_mcr, mcr_image);
740 sio_setreg(com, com_ier, 0);
741 DELAY(1000); /* XXX */
742 irqmap[0] = isa_irq_pending();
743
744 /*
745 * Attempt to set loopback mode so that we can send a null byte
746 * without annoying any external device.
747 */
748 /* EXTRA DELAY? */
749 sio_setreg(com, com_mcr, mcr_image | MCR_LOOPBACK);
750
751 /*
752 * Attempt to generate an output interrupt. On 8250's, setting
753 * IER_ETXRDY generates an interrupt independent of the current
754 * setting and independent of whether the THR is empty. On 16450's,
755 * setting IER_ETXRDY generates an interrupt independent of the
756 * current setting. On 16550A's, setting IER_ETXRDY only
757 * generates an interrupt when IER_ETXRDY is not already set.
758 */
759 sio_setreg(com, com_ier, IER_ETXRDY);
760
761 /*
762 * On some 16x50 incompatibles, setting IER_ETXRDY doesn't generate
763 * an interrupt. They'd better generate one for actually doing
764 * output. Loopback may be broken on the same incompatibles but
765 * it's unlikely to do more than allow the null byte out.
766 */
767 sio_setreg(com, com_data, 0);
768 DELAY((1 + 2) * 1000000 / (SIO_TEST_SPEED / 10));
769
770 /*
771 * Turn off loopback mode so that the interrupt gate works again
772 * (MCR_IENABLE was hidden). This should leave the device driving
773 * an interrupt line high. It doesn't matter if the interrupt
774 * line oscillates while we are not looking at it, since interrupts
775 * are disabled.
776 */
777 /* EXTRA DELAY? */
778 sio_setreg(com, com_mcr, mcr_image);
779
780 /*
781 * Some pcmcia cards have the "TXRDY bug", so we check everyone
782 * for IIR_TXRDY implementation ( Palido 321s, DC-1S... )
783 */
784 if (COM_NOPROBE(flags)) {
785 /* Reading IIR register twice */
786 for (fn = 0; fn < 2; fn ++) {
787 DELAY(10000);
788 failures[6] = sio_getreg(com, com_iir);
789 }
790 /* Check IIR_TXRDY clear ? */
791 result = 0;
792 if (failures[6] & IIR_TXRDY) {
793 /* Nop, Double check with clearing IER */
794 sio_setreg(com, com_ier, 0);
795 if (sio_getreg(com, com_iir) & IIR_NOPEND) {
796 /* Ok. we're familia this gang */
797 SET_FLAG(dev, COM_C_IIR_TXRDYBUG);
798 } else {
799 /* Unknown, Just omit this chip.. XXX */
800 result = ENXIO;
801 sio_setreg(com, com_mcr, 0);
802 }
803 } else {
804 /* OK. this is well-known guys */
805 CLR_FLAG(dev, COM_C_IIR_TXRDYBUG);
806 }
807 sio_setreg(com, com_ier, 0);
808 sio_setreg(com, com_cfcr, CFCR_8BITS);
809 com_unlock();
810 bus_release_resource(dev, SYS_RES_IOPORT, rid, port);
811 lwkt_reltoken(&tty_token);
812 return (iobase == siocniobase ? 0 : result);
813 }
814
815 /*
816 * Check that
817 * o the CFCR, IER and MCR in UART hold the values written to them
818 * (the values happen to be all distinct - this is good for
819 * avoiding false positive tests from bus echoes).
820 * o an output interrupt is generated and its vector is correct.
821 * o the interrupt goes away when the IIR in the UART is read.
822 */
823 /* EXTRA DELAY? */
824 failures[0] = sio_getreg(com, com_cfcr) - CFCR_8BITS;
825 failures[1] = sio_getreg(com, com_ier) - IER_ETXRDY;
826 failures[2] = sio_getreg(com, com_mcr) - mcr_image;
827 DELAY(10000); /* Some internal modems need this time */
828 irqmap[1] = isa_irq_pending();
829 failures[4] = (sio_getreg(com, com_iir) & IIR_IMASK) - IIR_TXRDY;
830 DELAY(1000); /* XXX */
831 irqmap[2] = isa_irq_pending();
832 failures[6] = (sio_getreg(com, com_iir) & IIR_IMASK) - IIR_NOPEND;
833
834 /*
835 * Turn off all device interrupts and check that they go off properly.
836 * Leave MCR_IENABLE alone. For ports without a master port, it gates
837 * the OUT2 output of the UART to
838 * the ICU input. Closing the gate would give a floating ICU input
839 * (unless there is another device driving it) and spurious interrupts.
840 * (On the system that this was first tested on, the input floats high
841 * and gives a (masked) interrupt as soon as the gate is closed.)
842 */
843 sio_setreg(com, com_ier, 0);
844 sio_setreg(com, com_cfcr, CFCR_8BITS); /* dummy to avoid bus echo */
845 failures[7] = sio_getreg(com, com_ier);
846 DELAY(1000); /* XXX */
847 irqmap[3] = isa_irq_pending();
848 failures[9] = (sio_getreg(com, com_iir) & IIR_IMASK) - IIR_NOPEND;
849
850 com_unlock();
851
852 irqs = irqmap[1] & ~irqmap[0];
853 if (bus_get_resource(idev, SYS_RES_IRQ, 0, &xirq, NULL) == 0 &&
854 ((1 << xirq) & irqs) == 0)
855 kprintf(
856 "sio%d: configured irq %ld not in bitmap of probed irqs %#x\n",
857 device_get_unit(dev), xirq, irqs);
858 if (bootverbose)
859 kprintf("sio%d: irq maps: %#x %#x %#x %#x\n",
860 device_get_unit(dev),
861 irqmap[0], irqmap[1], irqmap[2], irqmap[3]);
862
863 result = 0;
864 for (fn = 0; fn < sizeof failures; ++fn)
865 if (failures[fn]) {
866 sio_setreg(com, com_mcr, 0);
867 result = ENXIO;
868 if (bootverbose) {
869 kprintf("sio%d: probe failed test(s):",
870 device_get_unit(dev));
871 for (fn = 0; fn < sizeof failures; ++fn)
872 if (failures[fn])
873 kprintf(" %d", fn);
874 kprintf("\n");
875 }
876 break;
877 }
878 bus_release_resource(dev, SYS_RES_IOPORT, rid, port);
879 lwkt_reltoken(&tty_token);
880 return (iobase == siocniobase ? 0 : result);
881 }
882
883 #ifdef COM_ESP
884 static int
885 espattach(struct com_s *com, Port_t esp_port)
886 {
887 u_char dips;
888 u_char val;
889
890 /*
891 * Check the ESP-specific I/O port to see if we're an ESP
892 * card. If not, return failure immediately.
893 */
894 if ((inb(esp_port) & 0xf3) == 0) {
895 kprintf(" port 0x%x is not an ESP board?\n", esp_port);
896 return (0);
897 }
898
899 lwkt_gettoken(&tty_token);
900 /*
901 * We've got something that claims to be a Hayes ESP card.
902 * Let's hope so.
903 */
904
905 /* Get the dip-switch configuration */
906 outb(esp_port + ESP_CMD1, ESP_GETDIPS);
907 dips = inb(esp_port + ESP_STATUS1);
908
909 /*
910 * Bits 0,1 of dips say which COM port we are.
911 */
912 if (rman_get_start(com->ioportres) == likely_com_ports[dips & 0x03])
913 kprintf(" : ESP");
914 else {
915 kprintf(" esp_port has com %d\n", dips & 0x03);
916 lwkt_reltoken(&tty_token);
917 return (0);
918 }
919
920 /*
921 * Check for ESP version 2.0 or later: bits 4,5,6 = 010.
922 */
923 outb(esp_port + ESP_CMD1, ESP_GETTEST);
924 val = inb(esp_port + ESP_STATUS1); /* clear reg 1 */
925 val = inb(esp_port + ESP_STATUS2);
926 if ((val & 0x70) < 0x20) {
927 kprintf("-old (%o)", val & 0x70);
928 lwkt_reltoken(&tty_token);
929 return (0);
930 }
931
932 /*
933 * Check for ability to emulate 16550: bit 7 == 1
934 */
935 if ((dips & 0x80) == 0) {
936 kprintf(" slave");
937 lwkt_reltoken(&tty_token);
938 return (0);
939 }
940
941 /*
942 * Okay, we seem to be a Hayes ESP card. Whee.
943 */
944 com->esp = TRUE;
945 com->esp_port = esp_port;
946 lwkt_reltoken(&tty_token);
947 return (1);
948 }
949 #endif /* COM_ESP */
950
951 static int
952 sio_isa_attach(device_t dev)
953 {
954 return (sioattach(dev, 0, 0UL));
955 }
956
957 int
958 sioattach(device_t dev, int xrid, u_long rclk)
959 {
960 struct com_s *com;
961 #ifdef COM_ESP
962 Port_t *espp;
963 #endif
964 Port_t iobase;
965 int minorbase;
966 int unit;
967 u_int flags;
968 int rid;
969 struct resource *port;
970 int ret;
971 static int did_init;
972
973 lwkt_gettoken(&tty_token);
974 if (did_init == 0) {
975 did_init = 1;
976 callout_init_mp(&sio_timeout_handle);
977 }
978
979 rid = xrid;
980 port = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid,
981 0, ~0, IO_COMSIZE, RF_ACTIVE);
982 if (!port) {
983 lwkt_reltoken(&tty_token);
984 return (ENXIO);
985 }
986
987 iobase = rman_get_start(port);
988 unit = device_get_unit(dev);
989 com = device_get_softc(dev);
990 flags = device_get_flags(dev);
991
992 if (unit >= sio_numunits)
993 sio_numunits = unit + 1;
994 /*
995 * sioprobe() has initialized the device registers as follows:
996 * o cfcr = CFCR_8BITS.
997 * It is most important that CFCR_DLAB is off, so that the
998 * data port is not hidden when we enable interrupts.
999 * o ier = 0.
1000 * Interrupts are only enabled when the line is open.
1001 * o mcr = MCR_IENABLE, or 0 if the port has AST/4 compatible
1002 * interrupt control register or the config specifies no irq.
1003 * Keeping MCR_DTR and MCR_RTS off might stop the external
1004 * device from sending before we are ready.
1005 */
1006 bzero(com, sizeof *com);
1007 com->unit = unit;
1008 com->ioportres = port;
1009 com->bst = rman_get_bustag(port);
1010 com->bsh = rman_get_bushandle(port);
1011 com->cfcr_image = CFCR_8BITS;
1012 com->dtr_wait = 3 * hz;
1013 callout_init_mp(&com->dtr_ch);
1014 callout_init_mp(&com->busy_ch);
1015 com->loses_outints = COM_LOSESOUTINTS(flags) != 0;
1016 com->no_irq = bus_get_resource(dev, SYS_RES_IRQ, 0, NULL, NULL) != 0;
1017 com->tx_fifo_size = 1;
1018 com->obufs[0].l_head = com->obuf1;
1019 com->obufs[1].l_head = com->obuf2;
1020
1021 com->data_port = iobase + com_data;
1022 com->int_id_port = iobase + com_iir;
1023 com->modem_ctl_port = iobase + com_mcr;
1024 com->mcr_image = inb(com->modem_ctl_port);
1025 com->line_status_port = iobase + com_lsr;
1026 com->modem_status_port = iobase + com_msr;
1027 com->intr_ctl_port = iobase + com_ier;
1028
1029 if (rclk == 0)
1030 rclk = DEFAULT_RCLK;
1031 com->rclk = rclk;
1032
1033 /*
1034 * We don't use all the flags from <sys/ttydefaults.h> since they
1035 * are only relevant for logins. It's important to have echo off
1036 * initially so that the line doesn't start blathering before the
1037 * echo flag can be turned off.
1038 */
1039 com->it_in.c_iflag = 0;
1040 com->it_in.c_oflag = 0;
1041 com->it_in.c_cflag = TTYDEF_CFLAG;
1042 com->it_in.c_lflag = 0;
1043 if (unit == comconsole) {
1044 com->it_in.c_iflag = TTYDEF_IFLAG;
1045 com->it_in.c_oflag = TTYDEF_OFLAG;
1046 com->it_in.c_cflag = TTYDEF_CFLAG | CLOCAL;
1047 com->it_in.c_lflag = TTYDEF_LFLAG;
1048 com->lt_out.c_cflag = com->lt_in.c_cflag = CLOCAL;
1049 com->lt_out.c_ispeed = com->lt_out.c_ospeed =
1050 com->lt_in.c_ispeed = com->lt_in.c_ospeed =
1051 com->it_in.c_ispeed = com->it_in.c_ospeed = comdefaultrate;
1052 } else
1053 com->it_in.c_ispeed = com->it_in.c_ospeed = TTYDEF_SPEED;
1054 if (siosetwater(com, com->it_in.c_ispeed) != 0) {
1055 /*
1056 * Leave i/o resources allocated if this is a `cn'-level
1057 * console, so that other devices can't snarf them.
1058 */
1059 if (iobase != siocniobase)
1060 bus_release_resource(dev, SYS_RES_IOPORT, rid, port);
1061 lwkt_reltoken(&tty_token);
1062 return (ENOMEM);
1063 }
1064 termioschars(&com->it_in);
1065 com->it_out = com->it_in;
1066
1067 /* attempt to determine UART type */
1068 kprintf("sio%d: type", unit);
1069
1070
1071 #ifdef COM_MULTIPORT
1072 if (!COM_ISMULTIPORT(flags) && !COM_IIR_TXRDYBUG(flags))
1073 #else
1074 if (!COM_IIR_TXRDYBUG(flags))
1075 #endif
1076 {
1077 u_char scr;
1078 u_char scr1;
1079 u_char scr2;
1080
1081 scr = sio_getreg(com, com_scr);
1082 sio_setreg(com, com_scr, 0xa5);
1083 scr1 = sio_getreg(com, com_scr);
1084 sio_setreg(com, com_scr, 0x5a);
1085 scr2 = sio_getreg(com, com_scr);
1086 sio_setreg(com, com_scr, scr);
1087 if (scr1 != 0xa5 || scr2 != 0x5a) {
1088 kprintf(" 8250");
1089 goto determined_type;
1090 }
1091 }
1092 sio_setreg(com, com_fifo, FIFO_ENABLE | FIFO_RX_HIGH);
1093 DELAY(100);
1094 com->st16650a = 0;
1095 switch (inb(com->int_id_port) & IIR_FIFO_MASK) {
1096 case FIFO_RX_LOW:
1097 kprintf(" 16450");
1098 break;
1099 case FIFO_RX_MEDL:
1100 kprintf(" 16450?");
1101 break;
1102 case FIFO_RX_MEDH:
1103 kprintf(" 16550?");
1104 break;
1105 case FIFO_RX_HIGH:
1106 if (COM_NOFIFO(flags)) {
1107 kprintf(" 16550A fifo disabled");
1108 } else {
1109 com->hasfifo = TRUE;
1110 if (COM_ST16650A(flags)) {
1111 com->st16650a = 1;
1112 com->tx_fifo_size = 32;
1113 kprintf(" ST16650A");
1114 } else if (COM_TI16754(flags)) {
1115 com->tx_fifo_size = 64;
1116 kprintf(" TI16754");
1117 } else {
1118 com->tx_fifo_size = COM_FIFOSIZE(flags);
1119 kprintf(" 16550A");
1120 }
1121 }
1122 #ifdef COM_ESP
1123 for (espp = likely_esp_ports; *espp != 0; espp++)
1124 if (espattach(com, *espp)) {
1125 com->tx_fifo_size = 1024;
1126 break;
1127 }
1128 #endif
1129 if (!com->st16650a && !COM_TI16754(flags)) {
1130 if (!com->tx_fifo_size)
1131 com->tx_fifo_size = 16;
1132 else
1133 kprintf(" lookalike with %d bytes FIFO",
1134 com->tx_fifo_size);
1135 }
1136
1137 break;
1138 }
1139 #ifdef COM_ESP
1140 if (com->esp) {
1141 /*
1142 * Set 16550 compatibility mode.
1143 * We don't use the ESP_MODE_SCALE bit to increase the
1144 * fifo trigger levels because we can't handle large
1145 * bursts of input.
1146 * XXX flow control should be set in comparam(), not here.
1147 */
1148 outb(com->esp_port + ESP_CMD1, ESP_SETMODE);
1149 outb(com->esp_port + ESP_CMD2, ESP_MODE_RTS | ESP_MODE_FIFO);
1150
1151 /* Set RTS/CTS flow control. */
1152 outb(com->esp_port + ESP_CMD1, ESP_SETFLOWTYPE);
1153 outb(com->esp_port + ESP_CMD2, ESP_FLOW_RTS);
1154 outb(com->esp_port + ESP_CMD2, ESP_FLOW_CTS);
1155
1156 /* Set flow-control levels. */
1157 outb(com->esp_port + ESP_CMD1, ESP_SETRXFLOW);
1158 outb(com->esp_port + ESP_CMD2, HIBYTE(768));
1159 outb(com->esp_port + ESP_CMD2, LOBYTE(768));
1160 outb(com->esp_port + ESP_CMD2, HIBYTE(512));
1161 outb(com->esp_port + ESP_CMD2, LOBYTE(512));
1162 }
1163 #endif /* COM_ESP */
1164 sio_setreg(com, com_fifo, 0);
1165 determined_type: ;
1166
1167 #ifdef COM_MULTIPORT
1168 if (COM_ISMULTIPORT(flags)) {
1169 device_t masterdev;
1170
1171 com->multiport = TRUE;
1172 kprintf(" (multiport");
1173 if (unit == COM_MPMASTER(flags))
1174 kprintf(" master");
1175 kprintf(")");
1176 masterdev = devclass_get_device(sio_devclass,
1177 COM_MPMASTER(flags));
1178 com->no_irq = (masterdev == NULL || bus_get_resource(masterdev,
1179 SYS_RES_IRQ, 0, NULL, NULL) != 0);
1180 }
1181 #endif /* COM_MULTIPORT */
1182 if (unit == comconsole)
1183 kprintf(", console");
1184 if (COM_IIR_TXRDYBUG(flags))
1185 kprintf(" with a bogus IIR_TXRDY register");
1186 kprintf("\n");
1187
1188 if (!sio_registered) {
1189 register_swi_mp(SWI_TTY, siopoll, NULL,
1190 "swi_siopoll", NULL, -1);
1191 sio_registered = TRUE;
1192 }
1193 minorbase = UNIT_TO_MINOR(unit);
1194 make_dev(&sio_ops, minorbase,
1195 UID_ROOT, GID_WHEEL, 0600, "ttyd%r", unit);
1196 make_dev(&sio_ops, minorbase | CONTROL_INIT_STATE,
1197 UID_ROOT, GID_WHEEL, 0600, "ttyid%r", unit);
1198 make_dev(&sio_ops, minorbase | CONTROL_LOCK_STATE,
1199 UID_ROOT, GID_WHEEL, 0600, "ttyld%r", unit);
1200 make_dev(&sio_ops, minorbase | CALLOUT_MASK,
1201 UID_UUCP, GID_DIALER, 0660, "cuaa%r", unit);
1202 make_dev(&sio_ops, minorbase | CALLOUT_MASK | CONTROL_INIT_STATE,
1203 UID_UUCP, GID_DIALER, 0660, "cuaia%r", unit);
1204 make_dev(&sio_ops, minorbase | CALLOUT_MASK | CONTROL_LOCK_STATE,
1205 UID_UUCP, GID_DIALER, 0660, "cuala%r", unit);
1206 com->flags = flags;
1207 com->pps.ppscap = PPS_CAPTUREASSERT | PPS_CAPTURECLEAR;
1208 pps_init(&com->pps);
1209
1210 rid = 0;
1211 com->irqres = bus_alloc_resource(dev, SYS_RES_IRQ, &rid, 0ul, ~0ul, 1,
1212 RF_ACTIVE);
1213 if (com->irqres) {
1214 ret = BUS_SETUP_INTR(device_get_parent(dev), dev,
1215 com->irqres, INTR_MPSAFE, siointr, com,
1216 &com->cookie, NULL, NULL);
1217 if (ret)
1218 device_printf(dev, "could not activate interrupt\n");
1219 #if defined(DDB)
1220 /*
1221 * Enable interrupts for early break-to-debugger support
1222 * on the console.
1223 */
1224 if (ret == 0 && unit == comconsole &&
1225 (break_to_debugger || alt_break_to_debugger)) {
1226 inb(siocniobase + com_data);
1227 outb(siocniobase + com_ier,
1228 IER_ERXRDY | IER_ERLS | IER_EMSC);
1229 }
1230 #endif
1231 }
1232
1233 lwkt_reltoken(&tty_token);
1234 return (0);
1235 }
1236
1237 static int
1238 sioopen(struct dev_open_args *ap)
1239 {
1240 cdev_t dev = ap->a_head.a_dev;
1241 struct com_s *com;
1242 int error;
1243 int mynor;
1244 struct tty *tp;
1245 int unit;
1246
1247 mynor = minor(dev);
1248 unit = MINOR_TO_UNIT(mynor);
1249 com = com_addr(unit);
1250 if (com == NULL)
1251 return (ENXIO);
1252 if (com->gone)
1253 return (ENXIO);
1254 if (mynor & CONTROL_MASK)
1255 return (0);
1256 lwkt_gettoken(&tty_token);
1257 tp = dev->si_tty = com->tp = ttymalloc(com->tp);
1258 crit_enter();
1259 /*
1260 * We jump to this label after all non-interrupted sleeps to pick
1261 * up any changes of the device state.
1262 */
1263 open_top:
1264 while (com->state & CS_DTR_OFF) {
1265 error = tsleep(&com->dtr_wait, PCATCH, "siodtr", 0);
1266 if (com_addr(unit) == NULL) {
1267 crit_exit();
1268 lwkt_reltoken(&tty_token);
1269 return (ENXIO);
1270 }
1271 if (error != 0 || com->gone)
1272 goto out;
1273 }
1274 if (tp->t_state & TS_ISOPEN) {
1275 /*
1276 * The device is open, so everything has been initialized.
1277 * Handle conflicts.
1278 */
1279 if (mynor & CALLOUT_MASK) {
1280 if (!com->active_out) {
1281 error = EBUSY;
1282 goto out;
1283 }
1284 } else {
1285 if (com->active_out) {
1286 if (ap->a_oflags & O_NONBLOCK) {
1287 error = EBUSY;
1288 goto out;
1289 }
1290 error = tsleep(&com->active_out,
1291 PCATCH, "siobi", 0);
1292 if (com_addr(unit) == NULL) {
1293 crit_exit();
1294 lwkt_reltoken(&tty_token);
1295 return (ENXIO);
1296 }
1297 if (error != 0 || com->gone)
1298 goto out;
1299 goto open_top;
1300 }
1301 }
1302 if (tp->t_state & TS_XCLUDE && priv_check_cred(ap->a_cred, PRIV_ROOT, 0)) {
1303 error = EBUSY;
1304 goto out;
1305 }
1306 } else {
1307 /*
1308 * The device isn't open, so there are no conflicts.
1309 * Initialize it. Initialization is done twice in many
1310 * cases: to preempt sleeping callin opens if we are
1311 * callout, and to complete a callin open after DCD rises.
1312 */
1313 tp->t_oproc = comstart;
1314 tp->t_param = comparam;
1315 tp->t_stop = comstop;
1316 tp->t_dev = dev;
1317 tp->t_termios = mynor & CALLOUT_MASK
1318 ? com->it_out : com->it_in;
1319 (void)commctl(com, TIOCM_DTR | TIOCM_RTS, DMSET);
1320 com->poll = com->no_irq;
1321 com->poll_output = com->loses_outints;
1322 ++com->wopeners;
1323 error = comparam(tp, &tp->t_termios);
1324 --com->wopeners;
1325 if (error != 0)
1326 goto out;
1327 /*
1328 * XXX we should goto open_top if comparam() slept.
1329 */
1330 if (com->hasfifo) {
1331 /*
1332 * (Re)enable and drain fifos.
1333 *
1334 * Certain SMC chips cause problems if the fifos
1335 * are enabled while input is ready. Turn off the
1336 * fifo if necessary to clear the input. We test
1337 * the input ready bit after enabling the fifos
1338 * since we've already enabled them in comparam()
1339 * and to handle races between enabling and fresh
1340 * input.
1341 */
1342 while (TRUE) {
1343 sio_setreg(com, com_fifo,
1344 FIFO_RCV_RST | FIFO_XMT_RST
1345 | com->fifo_image);
1346 /*
1347 * XXX the delays are for superstitious
1348 * historical reasons. It must be less than
1349 * the character time at the maximum
1350 * supported speed (87 usec at 115200 bps
1351 * 8N1). Otherwise we might loop endlessly
1352 * if data is streaming in. We used to use
1353 * delays of 100. That usually worked
1354 * because DELAY(100) used to usually delay
1355 * for about 85 usec instead of 100.
1356 */
1357 DELAY(50);
1358 if (!(inb(com->line_status_port) & LSR_RXRDY))
1359 break;
1360 sio_setreg(com, com_fifo, 0);
1361 DELAY(50);
1362 (void) inb(com->data_port);
1363 }
1364 }
1365
1366 com_lock();
1367 (void) inb(com->line_status_port);
1368 (void) inb(com->data_port);
1369 com->prev_modem_status = com->last_modem_status
1370 = inb(com->modem_status_port);
1371 if (COM_IIR_TXRDYBUG(com->flags)) {
1372 outb(com->intr_ctl_port, IER_ERXRDY | IER_ERLS
1373 | IER_EMSC);
1374 } else {
1375 outb(com->intr_ctl_port, IER_ERXRDY | IER_ETXRDY
1376 | IER_ERLS | IER_EMSC);
1377 }
1378 com_unlock();
1379 /*
1380 * Handle initial DCD. Callout devices get a fake initial
1381 * DCD (trapdoor DCD). If we are callout, then any sleeping
1382 * callin opens get woken up and resume sleeping on "siobi"
1383 * instead of "siodcd".
1384 */
1385 /*
1386 * XXX `mynor & CALLOUT_MASK' should be
1387 * `tp->t_cflag & (SOFT_CARRIER | TRAPDOOR_CARRIER) where
1388 * TRAPDOOR_CARRIER is the default initial state for callout
1389 * devices and SOFT_CARRIER is like CLOCAL except it hides
1390 * the true carrier.
1391 */
1392 if (com->prev_modem_status & MSR_DCD || mynor & CALLOUT_MASK)
1393 (*linesw[tp->t_line].l_modem)(tp, 1);
1394 }
1395 /*
1396 * Wait for DCD if necessary.
1397 */
1398 if (!(tp->t_state & TS_CARR_ON) && !(mynor & CALLOUT_MASK)
1399 && !(tp->t_cflag & CLOCAL) && !(ap->a_oflags & O_NONBLOCK)) {
1400 ++com->wopeners;
1401 error = tsleep(TSA_CARR_ON(tp), PCATCH, "siodcd", 0);
1402 if (com_addr(unit) == NULL) {
1403 crit_exit();
1404 lwkt_reltoken(&tty_token);
1405 return (ENXIO);
1406 }
1407 --com->wopeners;
1408 if (error != 0 || com->gone)
1409 goto out;
1410 goto open_top;
1411 }
1412 error = (*linesw[tp->t_line].l_open)(dev, tp);
1413 disc_optim(tp, &tp->t_termios, com);
1414 if (tp->t_state & TS_ISOPEN && mynor & CALLOUT_MASK)
1415 com->active_out = TRUE;
1416 siosettimeout();
1417 out:
1418 crit_exit();
1419 if (!(tp->t_state & TS_ISOPEN) && com->wopeners == 0)
1420 comhardclose(com);
1421 lwkt_reltoken(&tty_token);
1422 return (error);
1423 }
1424
1425 static int
1426 sioclose(struct dev_close_args *ap)
1427 {
1428 cdev_t dev = ap->a_head.a_dev;
1429 struct com_s *com;
1430 int mynor;
1431 struct tty *tp;
1432
1433 mynor = minor(dev);
1434 if (mynor & CONTROL_MASK)
1435 return (0);
1436 lwkt_gettoken(&tty_token);
1437 com = com_addr(MINOR_TO_UNIT(mynor));
1438 if (com == NULL) {
1439 lwkt_reltoken(&tty_token);
1440 return (ENODEV);
1441 }
1442 tp = com->tp;
1443 crit_enter();
1444 (*linesw[tp->t_line].l_close)(tp, ap->a_fflag);
1445 disc_optim(tp, &tp->t_termios, com);
1446 comstop(tp, FREAD | FWRITE);
1447 comhardclose(com);
1448 ttyclose(tp);
1449 siosettimeout();
1450 crit_exit();
1451 if (com->gone) {
1452 kprintf("sio%d: gone\n", com->unit);
1453 crit_enter();
1454 if (com->ibuf != NULL)
1455 kfree(com->ibuf, M_DEVBUF);
1456 bzero(tp, sizeof *tp);
1457 crit_exit();
1458 }
1459 lwkt_reltoken(&tty_token);
1460 return (0);
1461 }
1462
1463 static void
1464 comhardclose(struct com_s *com)
1465 {
1466 struct tty *tp;
1467 crit_enter();
1468 lwkt_gettoken(&tty_token);
1469 com->poll = FALSE;
1470 com->poll_output = FALSE;
1471 com->do_timestamp = FALSE;
1472 com->do_dcd_timestamp = FALSE;
1473 com->pps.ppsparam.mode = 0;
1474 sio_setreg(com, com_cfcr, com->cfcr_image &= ~CFCR_SBREAK);
1475 tp = com->tp;
1476
1477 #if defined(DDB)
1478 /*
1479 * Leave interrupts enabled and don't clear DTR if this is the
1480 * console. This allows us to detect break-to-debugger events
1481 * while the console device is closed.
1482 */
1483 if (com->unit != comconsole ||
1484 (break_to_debugger == 0 && alt_break_to_debugger == 0))
1485 #endif
1486 {
1487 sio_setreg(com, com_ier, 0);
1488 if (tp->t_cflag & HUPCL
1489 /*
1490 * XXX we will miss any carrier drop between here and the
1491 * next open. Perhaps we should watch DCD even when the
1492 * port is closed; it is not sufficient to check it at
1493 * the next open because it might go up and down while
1494 * we're not watching.
1495 */
1496 || (!com->active_out
1497 && !(com->prev_modem_status & MSR_DCD)
1498 && !(com->it_in.c_cflag & CLOCAL))
1499 || !(tp->t_state & TS_ISOPEN)) {
1500 (void)commctl(com, TIOCM_DTR, DMBIC);
1501 if (com->dtr_wait != 0 && !(com->state & CS_DTR_OFF)) {
1502 callout_reset(&com->dtr_ch, com->dtr_wait,
1503 siodtrwakeup, com);
1504 com->state |= CS_DTR_OFF;
1505 }
1506 }
1507 }
1508 if (com->hasfifo) {
1509 /*
1510 * Disable fifos so that they are off after controlled
1511 * reboots. Some BIOSes fail to detect 16550s when the
1512 * fifos are enabled.
1513 */
1514 sio_setreg(com, com_fifo, 0);
1515 }
1516 com->active_out = FALSE;
1517 wakeup(&com->active_out);
1518 wakeup(TSA_CARR_ON(tp)); /* restart any wopeners */
1519 lwkt_reltoken(&tty_token);
1520 crit_exit();
1521 }
1522
1523 static int
1524 sioread(struct dev_read_args *ap)
1525 {
1526 cdev_t dev = ap->a_head.a_dev;
1527 int mynor, ret;
1528 struct com_s *com;
1529
1530 lwkt_gettoken(&tty_token);
1531 mynor = minor(dev);
1532 if (mynor & CONTROL_MASK) {
1533 lwkt_reltoken(&tty_token);
1534 return (ENODEV);
1535 }
1536 com = com_addr(MINOR_TO_UNIT(mynor));
1537 if (com == NULL || com->gone) {
1538 lwkt_reltoken(&tty_token);
1539 return (ENODEV);
1540 }
1541 ret = ((*linesw[com->tp->t_line].l_read)(com->tp, ap->a_uio, ap->a_ioflag));
1542 lwkt_reltoken(&tty_token);
1543 return ret;
1544 }
1545
1546 static int
1547 siowrite(struct dev_write_args *ap)
1548 {
1549 cdev_t dev = ap->a_head.a_dev;
1550 int mynor;
1551 struct com_s *com;
1552 int unit, ret;
1553
1554 lwkt_gettoken(&tty_token);
1555 mynor = minor(dev);
1556 if (mynor & CONTROL_MASK) {
1557 lwkt_reltoken(&tty_token);
1558 return (ENODEV);
1559 }
1560
1561 unit = MINOR_TO_UNIT(mynor);
1562 com = com_addr(unit);
1563 if (com == NULL || com->gone) {
1564 lwkt_reltoken(&tty_token);
1565 return (ENODEV);
1566 }
1567 /*
1568 * (XXX) We disallow virtual consoles if the physical console is
1569 * a serial port. This is in case there is a display attached that
1570 * is not the console. In that situation we don't need/want the X
1571 * server taking over the console.
1572 */
1573 if (constty != NULL && unit == comconsole)
1574 constty = NULL;
1575 ret = ((*linesw[com->tp->t_line].l_write)(com->tp, ap->a_uio, ap->a_ioflag));
1576 lwkt_reltoken(&tty_token);
1577 return ret;
1578 }
1579
1580 static void
1581 siobusycheck(void *chan)
1582 {
1583 struct com_s *com;
1584
1585 lwkt_gettoken(&tty_token);
1586 com = (struct com_s *)chan;
1587
1588 /*
1589 * Clear TS_BUSY if low-level output is complete.
1590 * spl locking is sufficient because siointr1() does not set CS_BUSY.
1591 * If siointr1() clears CS_BUSY after we look at it, then we'll get
1592 * called again. Reading the line status port outside of siointr1()
1593 * is safe because CS_BUSY is clear so there are no output interrupts
1594 * to lose.
1595 */
1596 crit_enter();
1597 if (com->state & CS_BUSY)
1598 com->extra_state &= ~CSE_BUSYCHECK; /* False alarm. */
1599 else if ((inb(com->line_status_port) & (LSR_TSRE | LSR_TXRDY))
1600 == (LSR_TSRE | LSR_TXRDY)) {
1601 com->tp->t_state &= ~TS_BUSY;
1602 ttwwakeup(com->tp);
1603 com->extra_state &= ~CSE_BUSYCHECK;
1604 } else {
1605 callout_reset(&com->busy_ch, hz / 100, siobusycheck, com);
1606 }
1607 crit_exit();
1608 lwkt_reltoken(&tty_token);
1609 }
1610
1611 static u_int
1612 siodivisor(u_long rclk, speed_t speed)
1613 {
1614 long actual_speed;
1615 u_int divisor;
1616 int error;
1617
1618 if (speed == 0 || speed > ((speed_t)-1 - 1) / 8)
1619 return (0);
1620 divisor = (rclk / (8UL * speed) + 1) / 2;
1621 if (divisor == 0 || divisor >= 65536)
1622 return (0);
1623 actual_speed = rclk / (16UL * divisor);
1624
1625 /* 10 times error in percent: */
1626 error = ((actual_speed - (long)speed) * 2000 / (long)speed + 1) / 2;
1627
1628 /* 3.0% maximum error tolerance: */
1629 if (error < -30 || error > 30)
1630 return (0);
1631
1632 return (divisor);
1633 }
1634
1635 static void
1636 siodtrwakeup(void *chan)
1637 {
1638 struct com_s *com;
1639
1640 lwkt_gettoken(&tty_token);
1641 com = (struct com_s *)chan;
1642 com->state &= ~CS_DTR_OFF;
1643 wakeup(&com->dtr_wait);
1644 lwkt_reltoken(&tty_token);
1645 }
1646
1647 /*
1648 * NOTE: Normally called with tty_token held but might not be when
1649 * operating as the console.
1650 *
1651 * Must be called with com_lock
1652 */
1653 static void
1654 sioinput(struct com_s *com)
1655 {
1656 u_char *buf;
1657 int incc;
1658 u_char line_status;
1659 int recv_data;
1660 struct tty *tp;
1661
1662 buf = com->ibuf;
1663 tp = com->tp;
1664 if (!(tp->t_state & TS_ISOPEN) || !(tp->t_cflag & CREAD)) {
1665 com_events -= (com->iptr - com->ibuf);
1666 com->iptr = com->ibuf;
1667 return;
1668 }
1669 if (tp->t_state & TS_CAN_BYPASS_L_RINT) {
1670 /*
1671 * Avoid the grotesquely inefficient lineswitch routine
1672 * (ttyinput) in "raw" mode. It usually takes about 450
1673 * instructions (that's without canonical processing or echo!).
1674 * slinput is reasonably fast (usually 40 instructions plus
1675 * call overhead).
1676 */
1677 do {
1678 com_unlock();
1679 incc = com->iptr - buf;
1680 if (tp->t_rawq.c_cc + incc > tp->t_ihiwat
1681 && (com->state & CS_RTS_IFLOW
1682 || tp->t_iflag & IXOFF)
1683 && !(tp->t_state & TS_TBLOCK))
1684 ttyblock(tp);
1685 com->delta_error_counts[CE_TTY_BUF_OVERFLOW]
1686 += b_to_q((char *)buf, incc, &tp->t_rawq);
1687 buf += incc;
1688 tk_nin += incc;
1689 tk_rawcc += incc;
1690 tp->t_rawcc += incc;
1691 ttwakeup(tp);
1692 if (tp->t_state & TS_TTSTOP
1693 && (tp->t_iflag & IXANY
1694 || tp->t_cc[VSTART] == tp->t_cc[VSTOP])) {
1695 tp->t_state &= ~TS_TTSTOP;
1696 tp->t_lflag &= ~FLUSHO;
1697 comstart(tp);
1698 }
1699 com_lock();
1700 } while (buf < com->iptr);
1701 } else {
1702 do {
1703 com_unlock();
1704 line_status = buf[com->ierroff];
1705 recv_data = *buf++;
1706 if (line_status
1707 & (LSR_BI | LSR_FE | LSR_OE | LSR_PE)) {
1708 if (line_status & LSR_BI)
1709 recv_data |= TTY_BI;
1710 if (line_status & LSR_FE)
1711 recv_data |= TTY_FE;
1712 if (line_status & LSR_OE)
1713 recv_data |= TTY_OE;
1714 if (line_status & LSR_PE)
1715 recv_data |= TTY_PE;
1716 }
1717 (*linesw[tp->t_line].l_rint)(recv_data, tp);
1718 com_lock();
1719 } while (buf < com->iptr);
1720 }
1721 com_events -= (com->iptr - com->ibuf);
1722 com->iptr = com->ibuf;
1723
1724 /*
1725 * There is now room for another low-level buffer full of input,
1726 * so enable RTS if it is now disabled and there is room in the
1727 * high-level buffer.
1728 */
1729 if ((com->state & CS_RTS_IFLOW) && !(com->mcr_image & MCR_RTS) &&
1730 !(tp->t_state & TS_TBLOCK))
1731 outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS);
1732 }
1733
1734 static void
1735 siointr(void *arg)
1736 {
1737 lwkt_gettoken(&tty_token);
1738 #ifndef COM_MULTIPORT
1739 com_lock();
1740 siointr1((struct com_s *) arg);
1741 com_unlock();
1742 #else /* COM_MULTIPORT */
1743 bool_t possibly_more_intrs;
1744 int unit;
1745 struct com_s *com;
1746
1747 /*
1748 * Loop until there is no activity on any port. This is necessary
1749 * to get an interrupt edge more than to avoid another interrupt.
1750 * If the IRQ signal is just an OR of the IRQ signals from several
1751 * devices, then the edge from one may be lost because another is
1752 * on.
1753 */
1754 com_lock();
1755 do {
1756 possibly_more_intrs = FALSE;
1757 for (unit = 0; unit < sio_numunits; ++unit) {
1758 com = com_addr(unit);
1759 /*
1760 * XXX com_lock();
1761 * would it work here, or be counter-productive?
1762 */
1763 if (com != NULL
1764 && !com->gone
1765 && (inb(com->int_id_port) & IIR_IMASK)
1766 != IIR_NOPEND) {
1767 siointr1(com);
1768 possibly_more_intrs = TRUE;
1769 }
1770 /* XXX com_unlock(); */
1771 }
1772 } while (possibly_more_intrs);
1773 com_unlock();
1774 #endif /* COM_MULTIPORT */
1775 lwkt_reltoken(&tty_token);
1776 }
1777
1778 /*
1779 * Called with tty_token held and com_lock held.
1780 */
1781 static void
1782 siointr1(struct com_s *com)
1783 {
1784 u_char line_status;
1785 u_char modem_status;
1786 u_char *ioptr;
1787 u_char recv_data;
1788 u_char int_ctl;
1789 u_char int_ctl_new;
1790 sysclock_t count;
1791
1792 int_ctl = inb(com->intr_ctl_port);
1793 int_ctl_new = int_ctl;
1794
1795 while (!com->gone) {
1796 if (com->pps.ppsparam.mode & PPS_CAPTUREBOTH) {
1797 modem_status = inb(com->modem_status_port);
1798 if ((modem_status ^ com->last_modem_status) & MSR_DCD) {
1799 count = sys_cputimer->count();
1800 pps_event(&com->pps, count,
1801 (modem_status & MSR_DCD) ?
1802 PPS_CAPTUREASSERT : PPS_CAPTURECLEAR);
1803 }
1804 }
1805 line_status = inb(com->line_status_port);
1806
1807 /* input event? (check first to help avoid overruns) */
1808 while (line_status & LSR_RCV_MASK) {
1809 /* break/unnattached error bits or real input? */
1810 if (!(line_status & LSR_RXRDY))
1811 recv_data = 0;
1812 else
1813 recv_data = inb(com->data_port);
1814 #if defined(DDB)
1815 /*
1816 * Solaris implements a new BREAK which is initiated
1817 * by a character sequence CR ~ ^b which is similar
1818 * to a familiar pattern used on Sun servers by the
1819 * Remote Console.
1820 */
1821 #define KEY_CRTLB 2 /* ^B */
1822 #define KEY_CR 13 /* CR '\r' */
1823 #define KEY_TILDE 126 /* ~ */
1824
1825 if (com->unit == comconsole && alt_break_to_debugger) {
1826 static int brk_state1 = 0, brk_state2 = 0;
1827 if (recv_data == KEY_CR) {
1828 brk_state1 = recv_data;
1829 brk_state2 = 0;
1830 } else if (brk_state1 == KEY_CR && (recv_data == KEY_TILDE || recv_data == KEY_CRTLB)) {
1831 if (recv_data == KEY_TILDE)
1832 brk_state2 = recv_data;
1833 else if (brk_state2 == KEY_TILDE && recv_data == KEY_CRTLB) {
1834 com_unlock();
1835 breakpoint();
1836 com_lock();
1837 brk_state1 = brk_state2 = 0;
1838 goto cont;
1839 } else
1840 brk_state2 = 0;
1841 } else
1842 brk_state1 = 0;
1843 }
1844 #endif
1845 if (line_status & (LSR_BI | LSR_FE | LSR_PE)) {
1846 /*
1847 * Don't store BI if IGNBRK or FE/PE if IGNPAR.
1848 * Otherwise, push the work to a higher level
1849 * (to handle PARMRK) if we're bypassing.
1850 * Otherwise, convert BI/FE and PE+INPCK to 0.
1851 *
1852 * This makes bypassing work right in the
1853 * usual "raw" case (IGNBRK set, and IGNPAR
1854 * and INPCK clear).
1855 *
1856 * Note: BI together with FE/PE means just BI.
1857 */
1858 if (line_status & LSR_BI) {
1859 #if defined(DDB)
1860 if (com->unit == comconsole &&
1861 break_to_debugger) {
1862 com_unlock();
1863 breakpoint();
1864 com_lock();
1865 goto cont;
1866 }
1867 #endif
1868 if (com->tp == NULL
1869 || com->tp->t_iflag & IGNBRK)
1870 goto cont;
1871 } else {
1872 if (com->tp == NULL
1873 || com->tp->t_iflag & IGNPAR)
1874 goto cont;
1875 }
1876 if (com->tp->t_state & TS_CAN_BYPASS_L_RINT
1877 && (line_status & (LSR_BI | LSR_FE)
1878 || com->tp->t_iflag & INPCK))
1879 recv_data = 0;
1880 }
1881 ++com->bytes_in;
1882 if (com->hotchar != 0 && recv_data == com->hotchar)
1883 setsofttty();
1884 ioptr = com->iptr;
1885 if (ioptr >= com->ibufend)
1886 CE_RECORD(com, CE_INTERRUPT_BUF_OVERFLOW);
1887 else {
1888 if (com->do_timestamp)
1889 microtime(&com->timestamp);
1890 ++com_events;
1891 schedsofttty();
1892 #if 0 /* for testing input latency vs efficiency */
1893 if (com->iptr - com->ibuf == 8)
1894 setsofttty();
1895 #endif
1896 ioptr[0] = recv_data;
1897 ioptr[com->ierroff] = line_status;
1898 com->iptr = ++ioptr;
1899 if (ioptr == com->ihighwater
1900 && com->state & CS_RTS_IFLOW)
1901 outb(com->modem_ctl_port,
1902 com->mcr_image &= ~MCR_RTS);
1903 if (line_status & LSR_OE)
1904 CE_RECORD(com, CE_OVERRUN);
1905 }
1906 cont:
1907 /*
1908 * "& 0x7F" is to avoid the gcc-1.40 generating a slow
1909 * jump from the top of the loop to here
1910 */
1911 line_status = inb(com->line_status_port) & 0x7F;
1912 }
1913
1914 /* modem status change? (always check before doing output) */
1915 modem_status = inb(com->modem_status_port);
1916 if (modem_status != com->last_modem_status) {
1917 if (com->do_dcd_timestamp
1918 && !(com->last_modem_status & MSR_DCD)
1919 && modem_status & MSR_DCD)
1920 microtime(&com->dcd_timestamp);
1921
1922 /*
1923 * Schedule high level to handle DCD changes. Note
1924 * that we don't use the delta bits anywhere. Some
1925 * UARTs mess them up, and it's easy to remember the
1926 * previous bits and calculate the delta.
1927 */
1928 com->last_modem_status = modem_status;
1929 if (!(com->state & CS_CHECKMSR)) {
1930 com_events += LOTS_OF_EVENTS;
1931 com->state |= CS_CHECKMSR;
1932 setsofttty();
1933 }
1934
1935 /* handle CTS change immediately for crisp flow ctl */
1936 if (com->state & CS_CTS_OFLOW) {
1937 if (modem_status & MSR_CTS)
1938 com->state |= CS_ODEVREADY;
1939 else
1940 com->state &= ~CS_ODEVREADY;
1941 }
1942 }
1943
1944 /* output queued and everything ready? */
1945 if ((line_status & LSR_TXRDY)
1946 && com->state >= (CS_BUSY | CS_TTGO | CS_ODEVREADY)) {
1947 ioptr = com->obufq.l_head;
1948 if (com->tx_fifo_size > 1) {
1949 u_int ocount;
1950
1951 ocount = com->obufq.l_tail - ioptr;
1952 if (ocount > com->tx_fifo_size)
1953 ocount = com->tx_fifo_size;
1954 com->bytes_out += ocount;
1955 do
1956 outb(com->data_port, *ioptr++);
1957 while (--ocount != 0);
1958 } else {
1959 outb(com->data_port, *ioptr++);
1960 ++com->bytes_out;
1961 }
1962 com->obufq.l_head = ioptr;
1963 if (COM_IIR_TXRDYBUG(com->flags)) {
1964 int_ctl_new = int_ctl | IER_ETXRDY;
1965 }
1966 if (ioptr >= com->obufq.l_tail) {
1967 struct lbq *qp;
1968
1969 qp = com->obufq.l_next;
1970 qp->l_queued = FALSE;
1971 qp = qp->l_next;
1972 if (qp != NULL) {
1973 com->obufq.l_head = qp->l_head;
1974 com->obufq.l_tail = qp->l_tail;
1975 com->obufq.l_next = qp;
1976 } else {
1977 /* output just completed */
1978 if (COM_IIR_TXRDYBUG(com->flags)) {
1979 int_ctl_new = int_ctl & ~IER_ETXRDY;
1980 }
1981 com->state &= ~CS_BUSY;
1982 }
1983 if (!(com->state & CS_ODONE)) {
1984 com_events += LOTS_OF_EVENTS;
1985 com->state |= CS_ODONE;
1986 setsofttty(); /* handle at high level ASAP */
1987 }
1988 }
1989 if (COM_IIR_TXRDYBUG(com->flags) && (int_ctl != int_ctl_new)) {
1990 outb(com->intr_ctl_port, int_ctl_new);
1991 }
1992 }
1993
1994 /* finished? */
1995 #ifdef COM_MULTIPORT
1996 return;
1997 #else
1998 if (inb(com->int_id_port) & IIR_NOPEND)
1999 return;
2000 #endif
2001 }
2002 }
2003
2004 static int
2005 sioioctl(struct dev_ioctl_args *ap)
2006 {
2007 cdev_t dev = ap->a_head.a_dev;
2008 caddr_t data = ap->a_data;
2009 struct com_s *com;
2010 int error;
2011 int mynor;
2012 struct tty *tp;
2013
2014 lwkt_gettoken(&tty_token);
2015 mynor = minor(dev);
2016
2017 com = com_addr(MINOR_TO_UNIT(mynor));
2018 if (com == NULL || com->gone) {
2019 lwkt_reltoken(&tty_token);
2020 return (ENODEV);
2021 }
2022 if (mynor & CONTROL_MASK) {
2023 struct termios *ct;
2024
2025 switch (mynor & CONTROL_MASK) {
2026 case CONTROL_INIT_STATE:
2027 ct = mynor & CALLOUT_MASK ? &com->it_out : &com->it_in;
2028 break;
2029 case CONTROL_LOCK_STATE:
2030 ct = mynor & CALLOUT_MASK ? &com->lt_out : &com->lt_in;
2031 break;
2032 default:
2033 lwkt_reltoken(&tty_token);
2034 return (ENODEV); /* /dev/nodev */
2035 }
2036 switch (ap->a_cmd) {
2037 case TIOCSETA:
2038 error = priv_check_cred(ap->a_cred, PRIV_ROOT, 0);
2039 if (error != 0) {
2040 lwkt_reltoken(&tty_token);
2041 return (error);
2042 }
2043 *ct = *(struct termios *)data;
2044 lwkt_reltoken(&tty_token);
2045 return (0);
2046 case TIOCGETA:
2047 *(struct termios *)data = *ct;
2048 lwkt_reltoken(&tty_token);
2049 return (0);
2050 case TIOCGETD:
2051 *(int *)data = TTYDISC;
2052 lwkt_reltoken(&tty_token);
2053 return (0);
2054 case TIOCGWINSZ:
2055 bzero(data, sizeof(struct winsize));
2056 lwkt_reltoken(&tty_token);
2057 return (0);
2058 default:
2059 lwkt_reltoken(&tty_token);
2060 return (ENOTTY);
2061 }
2062 }
2063 tp = com->tp;
2064 if (ap->a_cmd == TIOCSETA || ap->a_cmd == TIOCSETAW ||
2065 ap->a_cmd == TIOCSETAF) {
2066 int cc;
2067 struct termios *dt = (struct termios *)data;
2068 struct termios *lt = mynor & CALLOUT_MASK
2069 ? &com->lt_out : &com->lt_in;
2070
2071 dt->c_iflag = (tp->t_iflag & lt->c_iflag)
2072 | (dt->c_iflag & ~lt->c_iflag);
2073 dt->c_oflag = (tp->t_oflag & lt->c_oflag)
2074 | (dt->c_oflag & ~lt->c_oflag);
2075 dt->c_cflag = (tp->t_cflag & lt->c_cflag)
2076 | (dt->c_cflag & ~lt->c_cflag);
2077 dt->c_lflag = (tp->t_lflag & lt->c_lflag)
2078 | (dt->c_lflag & ~lt->c_lflag);
2079 for (cc = 0; cc < NCCS; ++cc)
2080 if (lt->c_cc[cc] != 0)
2081 dt->c_cc[cc] = tp->t_cc[cc];
2082 if (lt->c_ispeed != 0)
2083 dt->c_ispeed = tp->t_ispeed;
2084 if (lt->c_ospeed != 0)
2085 dt->c_ospeed = tp->t_ospeed;
2086 }
2087 error = (*linesw[tp->t_line].l_ioctl)(tp, ap->a_cmd, data, ap->a_fflag, ap->a_cred);
2088 if (error != ENOIOCTL) {
2089 lwkt_reltoken(&tty_token);
2090 return (error);
2091 }
2092 crit_enter();
2093 error = ttioctl(tp, ap->a_cmd, data, ap->a_fflag);
2094 disc_optim(tp, &tp->t_termios, com);
2095 if (error != ENOIOCTL) {
2096 crit_exit();
2097 lwkt_reltoken(&tty_token);
2098 return (error);
2099 }
2100 switch (ap->a_cmd) {
2101 case TIOCSBRK:
2102 sio_setreg(com, com_cfcr, com->cfcr_image |= CFCR_SBREAK);
2103 break;
2104 case TIOCCBRK:
2105 sio_setreg(com, com_cfcr, com->cfcr_image &= ~CFCR_SBREAK);
2106 break;
2107 case TIOCSDTR:
2108 (void)commctl(com, TIOCM_DTR, DMBIS);
2109 break;
2110 case TIOCCDTR:
2111 (void)commctl(com, TIOCM_DTR, DMBIC);
2112 break;
2113 /*
2114 * XXX should disallow changing MCR_RTS if CS_RTS_IFLOW is set. The
2115 * changes get undone on the next call to comparam().
2116 */
2117 case TIOCMSET:
2118 (void)commctl(com, *(int *)data, DMSET);
2119 break;
2120 case TIOCMBIS:
2121 (void)commctl(com, *(int *)data, DMBIS);
2122 break;
2123 case TIOCMBIC:
2124 (void)commctl(com, *(int *)data, DMBIC);
2125 break;
2126 case TIOCMGET:
2127 *(int *)data = commctl(com, 0, DMGET);
2128 break;
2129 case TIOCMSDTRWAIT:
2130 /* must be root since the wait applies to following logins */
2131 error = priv_check_cred(ap->a_cred, PRIV_ROOT, 0);
2132 if (error != 0) {
2133 crit_exit();
2134 lwkt_reltoken(&tty_token);
2135 return (error);
2136 }
2137 com->dtr_wait = *(int *)data * hz / 100;
2138 break;
2139 case TIOCMGDTRWAIT:
2140 *(int *)data = com->dtr_wait * 100 / hz;
2141 break;
2142 case TIOCTIMESTAMP:
2143 com->do_timestamp = TRUE;
2144 *(struct timeval *)data = com->timestamp;
2145 break;
2146 case TIOCDCDTIMESTAMP:
2147 com->do_dcd_timestamp = TRUE;
2148 *(struct timeval *)data = com->dcd_timestamp;
2149 break;
2150 default:
2151 crit_exit();
2152 error = pps_ioctl(ap->a_cmd, data, &com->pps);
2153 if (error == ENODEV)
2154 error = ENOTTY;
2155 lwkt_reltoken(&tty_token);
2156 return (error);
2157 }
2158 crit_exit();
2159 lwkt_reltoken(&tty_token);
2160 return (0);
2161 }
2162
2163 static void
2164 siopoll(void *dummy, void *frame)
2165 {
2166 int unit;
2167
2168 lwkt_gettoken(&tty_token);
2169 if (com_events == 0) {
2170 lwkt_reltoken(&tty_token);
2171 return;
2172 }
2173
2174 repeat:
2175 for (unit = 0; unit < sio_numunits; ++unit) {
2176 struct com_s *com;
2177 int incc;
2178 struct tty *tp;
2179
2180 com = com_addr(unit);
2181 if (com == NULL)
2182 continue;
2183 tp = com->tp;
2184 if (tp == NULL || com->gone) {
2185 /*
2186 * Discard any events related to never-opened or
2187 * going-away devices.
2188 */
2189 com_lock();
2190 incc = com->iptr - com->ibuf;
2191 com->iptr = com->ibuf;
2192 if (com->state & CS_CHECKMSR) {
2193 incc += LOTS_OF_EVENTS;
2194 com->state &= ~CS_CHECKMSR;
2195 }
2196 com_events -= incc;
2197 com_unlock();
2198 continue;
2199 }
2200 if (com->iptr != com->ibuf) {
2201 com_lock();
2202 sioinput(com);
2203 com_unlock();
2204 }
2205 if (com->state & CS_CHECKMSR) {
2206 u_char delta_modem_status;
2207
2208 com_lock();
2209 delta_modem_status = com->last_modem_status
2210 ^ com->prev_modem_status;
2211 com->prev_modem_status = com->last_modem_status;
2212 com_events -= LOTS_OF_EVENTS;
2213 com->state &= ~CS_CHECKMSR;
2214 com_unlock();
2215 if (delta_modem_status & MSR_DCD)
2216 (*linesw[tp->t_line].l_modem)
2217 (tp, com->prev_modem_status & MSR_DCD);
2218 }
2219 if (com->state & CS_ODONE) {
2220 com_lock();
2221 com_events -= LOTS_OF_EVENTS;
2222 com->state &= ~CS_ODONE;
2223 com_unlock();
2224 if (!(com->state & CS_BUSY)
2225 && !(com->extra_state & CSE_BUSYCHECK)) {
2226 callout_reset(&com->busy_ch, hz / 100,
2227 siobusycheck, com);
2228 com->extra_state |= CSE_BUSYCHECK;
2229 }
2230 (*linesw[tp->t_line].l_start)(tp);
2231 }
2232 if (com_events == 0)
2233 break;
2234 }
2235 if (com_events >= LOTS_OF_EVENTS)
2236 goto repeat;
2237 lwkt_reltoken(&tty_token);
2238 }
2239
2240 /*
2241 * Called with tty_token held but no com_lock
2242 */
2243 static int
2244 comparam(struct tty *tp, struct termios *t)
2245 {
2246 u_int cfcr;
2247 int cflag;
2248 struct com_s *com;
2249 u_int divisor;
2250 u_char dlbh;
2251 u_char dlbl;
2252 int unit;
2253
2254 unit = DEV_TO_UNIT(tp->t_dev);
2255 com = com_addr(unit);
2256 if (com == NULL) {
2257 return (ENODEV);
2258 }
2259
2260 /* do historical conversions */
2261 if (t->c_ispeed == 0)
2262 t->c_ispeed = t->c_ospeed;
2263
2264 /* check requested parameters */
2265 if (t->c_ospeed == 0)
2266 divisor = 0;
2267 else {
2268 if (t->c_ispeed != t->c_ospeed)
2269 return (EINVAL);
2270 divisor = siodivisor(com->rclk, t->c_ispeed);
2271 if (divisor == 0)
2272 return (EINVAL);
2273 }
2274
2275 /* parameters are OK, convert them to the com struct and the device */
2276 crit_enter();
2277 if (divisor == 0)
2278 (void)commctl(com, TIOCM_DTR, DMBIC); /* hang up line */
2279 else
2280 (void)commctl(com, TIOCM_DTR, DMBIS);
2281 cflag = t->c_cflag;
2282 switch (cflag & CSIZE) {
2283 case CS5:
2284 cfcr = CFCR_5BITS;
2285 break;
2286 case CS6:
2287 cfcr = CFCR_6BITS;
2288 break;
2289 case CS7:
2290 cfcr = CFCR_7BITS;
2291 break;
2292 default:
2293 cfcr = CFCR_8BITS;
2294 break;
2295 }
2296 if (cflag & PARENB) {
2297 cfcr |= CFCR_PENAB;
2298 if (!(cflag & PARODD))
2299 cfcr |= CFCR_PEVEN;
2300 }
2301 if (cflag & CSTOPB)
2302 cfcr |= CFCR_STOPB;
2303
2304 if (com->hasfifo && divisor != 0) {
2305 /*
2306 * Use a fifo trigger level low enough so that the input
2307 * latency from the fifo is less than about 16 msec and
2308 * the total latency is less than about 30 msec. These
2309 * latencies are reasonable for humans. Serial comms
2310 * protocols shouldn't expect anything better since modem
2311 * latencies are larger.
2312 *
2313 * Interrupts can be held up for long periods of time
2314 * due to inefficiencies in other parts of the kernel,
2315 * certain video cards, etc. Setting the FIFO trigger
2316 * point to MEDH instead of HIGH gives us 694uS of slop
2317 * (8 character times) instead of 173uS (2 character times)
2318 * @ 115200 bps.
2319 */
2320 com->fifo_image = t->c_ospeed <= 4800
2321 ? FIFO_ENABLE : FIFO_ENABLE | FIFO_RX_MEDH;
2322 #ifdef COM_ESP
2323 /*
2324 * The Hayes ESP card needs the fifo DMA mode bit set
2325 * in compatibility mode. If not, it will interrupt
2326 * for each character received.
2327 */
2328 if (com->esp)
2329 com->fifo_image |= FIFO_DMA_MODE;
2330 #endif
2331 sio_setreg(com, com_fifo, com->fifo_image);
2332 }
2333
2334 /*
2335 * This returns with interrupts disabled so that we can complete
2336 * the speed change atomically. Keeping interrupts disabled is
2337 * especially important while com_data is hidden.
2338 */
2339 (void) siosetwater(com, t->c_ispeed);
2340
2341 if (divisor != 0) {
2342 sio_setreg(com, com_cfcr, cfcr | CFCR_DLAB);
2343 /*
2344 * Only set the divisor registers if they would change,
2345 * since on some 16550 incompatibles (UMC8669F), setting
2346 * them while input is arriving them loses sync until
2347 * data stops arriving.
2348 */
2349 dlbl = divisor & 0xFF;
2350 if (sio_getreg(com, com_dlbl) != dlbl)
2351 sio_setreg(com, com_dlbl, dlbl);
2352 dlbh = divisor >> 8;
2353 if (sio_getreg(com, com_dlbh) != dlbh)
2354 sio_setreg(com, com_dlbh, dlbh);
2355 }
2356
2357 sio_setreg(com, com_cfcr, com->cfcr_image = cfcr);
2358
2359 if (!(tp->t_state & TS_TTSTOP))
2360 com->state |= CS_TTGO;
2361
2362 if (cflag & CRTS_IFLOW) {
2363 if (com->st16650a) {
2364 sio_setreg(com, com_cfcr, 0xbf);
2365 sio_setreg(com, com_fifo,
2366 sio_getreg(com, com_fifo) | 0x40);
2367 }
2368 com->state |= CS_RTS_IFLOW;
2369 /*
2370 * If CS_RTS_IFLOW just changed from off to on, the change
2371 * needs to be propagated to MCR_RTS. This isn't urgent,
2372 * so do it later by calling comstart() instead of repeating
2373 * a lot of code from comstart() here.
2374 */
2375 } else if (com->state & CS_RTS_IFLOW) {
2376 com->state &= ~CS_RTS_IFLOW;
2377 /*
2378 * CS_RTS_IFLOW just changed from on to off. Force MCR_RTS
2379 * on here, since comstart() won't do it later.
2380 */
2381 outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS);
2382 if (com->st16650a) {
2383 sio_setreg(com, com_cfcr, 0xbf);
2384 sio_setreg(com, com_fifo,
2385 sio_getreg(com, com_fifo) & ~0x40);
2386 }
2387 }
2388
2389
2390 /*
2391 * Set up state to handle output flow control.
2392 * XXX - worth handling MDMBUF (DCD) flow control at the lowest level?
2393 * Now has 10+ msec latency, while CTS flow has 50- usec latency.
2394 */
2395 com->state |= CS_ODEVREADY;
2396 com->state &= ~CS_CTS_OFLOW;
2397 if (cflag & CCTS_OFLOW) {
2398 com->state |= CS_CTS_OFLOW;
2399 if (!(com->last_modem_status & MSR_CTS))
2400 com->state &= ~CS_ODEVREADY;
2401 if (com->st16650a) {
2402 sio_setreg(com, com_cfcr, 0xbf);
2403 sio_setreg(com, com_fifo,
2404 sio_getreg(com, com_fifo) | 0x80);
2405 }
2406 } else {
2407 if (com->st16650a) {
2408 sio_setreg(com, com_cfcr, 0xbf);
2409 sio_setreg(com, com_fifo,
2410 sio_getreg(com, com_fifo) & ~0x80);
2411 }
2412 }
2413
2414 sio_setreg(com, com_cfcr, com->cfcr_image);
2415
2416 /* XXX shouldn't call functions while intrs are disabled. */
2417 disc_optim(tp, t, com);
2418 /*
2419 * Recover from fiddling with CS_TTGO. We used to call siointr1()
2420 * unconditionally, but that defeated the careful discarding of
2421 * stale input in sioopen().
2422 */
2423 if (com->state >= (CS_BUSY | CS_TTGO)) {
2424 com_lock();
2425 siointr1(com);
2426 com_unlock();
2427 }
2428 crit_exit();
2429 comstart(tp);
2430 if (com->ibufold != NULL) {
2431 kfree(com->ibufold, M_DEVBUF);
2432 com->ibufold = NULL;
2433 }
2434 return (0);
2435 }
2436
2437 /*
2438 * called with tty_token held
2439 */
2440 static int
2441 siosetwater(struct com_s *com, speed_t speed)
2442 {
2443 int cp4ticks;
2444 u_char *ibuf;
2445 int ibufsize;
2446 struct tty *tp;
2447
2448 /*
2449 * Make the buffer size large enough to handle a softtty interrupt
2450 * latency of about 2 ticks without loss of throughput or data
2451 * (about 3 ticks if input flow control is not used or not honoured,
2452 * but a bit less for CS5-CS7 modes).
2453 */
2454 cp4ticks = speed / 10 / hz * 4;
2455 for (ibufsize = 128; ibufsize < cp4ticks;)
2456 ibufsize <<= 1;
2457 if (ibufsize == com->ibufsize)
2458 return (0);
2459
2460 /*
2461 * Allocate input buffer. The extra factor of 2 in the size is
2462 * to allow for an error byte for each input byte.
2463 */
2464 ibuf = kmalloc(2 * ibufsize, M_DEVBUF, M_WAITOK | M_ZERO);
2465
2466 /* Initialize non-critical variables. */
2467 com->ibufold = com->ibuf;
2468 com->ibufsize = ibufsize;
2469 tp = com->tp;
2470 if (tp != NULL) {
2471 tp->t_ififosize = 2 * ibufsize;
2472 tp->t_ispeedwat = (speed_t)-1;
2473 tp->t_ospeedwat = (speed_t)-1;
2474 }
2475
2476 /*
2477 * Read current input buffer.
2478 */
2479 com_lock();
2480 if (com->iptr != com->ibuf)
2481 sioinput(com);
2482
2483 /*-
2484 * Initialize critical variables, including input buffer watermarks.
2485 * The external device is asked to stop sending when the buffer
2486 * exactly reaches high water, or when the high level requests it.
2487 * The high level is notified immediately (rather than at a later
2488 * clock tick) when this watermark is reached.
2489 * The buffer size is chosen so the watermark should almost never
2490 * be reached.
2491 * The low watermark is invisibly 0 since the buffer is always
2492 * emptied all at once.
2493 */
2494 com->iptr = com->ibuf = ibuf;
2495 com->ibufend = ibuf + ibufsize;
2496 com->ierroff = ibufsize;
2497 com->ihighwater = ibuf + 3 * ibufsize / 4;
2498 com_unlock();
2499 return (0);
2500 }
2501
2502 static void
2503 comstart(struct tty *tp)
2504 {
2505 struct com_s *com;
2506 int unit;
2507
2508 lwkt_gettoken(&tty_token);
2509 unit = DEV_TO_UNIT(tp->t_dev);
2510 com = com_addr(unit);
2511 if (com == NULL) {
2512 lwkt_reltoken(&tty_token);
2513 return;
2514 }
2515 crit_enter();
2516 com_lock();
2517 if (tp->t_state & TS_TTSTOP)
2518 com->state &= ~CS_TTGO;
2519 else
2520 com->state |= CS_TTGO;
2521 if (tp->t_state & TS_TBLOCK) {
2522 if (com->mcr_image & MCR_RTS && com->state & CS_RTS_IFLOW)
2523 outb(com->modem_ctl_port, com->mcr_image &= ~MCR_RTS);
2524 } else {
2525 if (!(com->mcr_image & MCR_RTS) && com->iptr < com->ihighwater
2526 && com->state & CS_RTS_IFLOW)
2527 outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS);
2528 }
2529 com_unlock();
2530 if (tp->t_state & (TS_TIMEOUT | TS_TTSTOP)) {
2531 ttwwakeup(tp);
2532 crit_exit();
2533 lwkt_reltoken(&tty_token);
2534 return;
2535 }
2536 if (tp->t_outq.c_cc != 0) {
2537 struct lbq *qp;
2538 struct lbq *next;
2539
2540 if (!com->obufs[0].l_queued) {
2541 com->obufs[0].l_tail
2542 = com->obuf1 + q_to_b(&tp->t_outq, com->obuf1,
2543 sizeof com->obuf1);
2544 com->obufs[0].l_next = NULL;
2545 com->obufs[0].l_queued = TRUE;
2546 com_lock();
2547 if (com->state & CS_BUSY) {
2548 qp = com->obufq.l_next;
2549 while ((next = qp->l_next) != NULL)
2550 qp = next;
2551 qp->l_next = &com->obufs[0];
2552 } else {
2553 com->obufq.l_head = com->obufs[0].l_head;
2554 com->obufq.l_tail = com->obufs[0].l_tail;
2555 com->obufq.l_next = &com->obufs[0];
2556 com->state |= CS_BUSY;
2557 }
2558 com_unlock();
2559 }
2560 if (tp->t_outq.c_cc != 0 && !com->obufs[1].l_queued) {
2561 com->obufs[1].l_tail
2562 = com->obuf2 + q_to_b(&tp->t_outq, com->obuf2,
2563 sizeof com->obuf2);
2564 com->obufs[1].l_next = NULL;
2565 com->obufs[1].l_queued = TRUE;
2566 com_lock();
2567 if (com->state & CS_BUSY) {
2568 qp = com->obufq.l_next;
2569 while ((next = qp->l_next) != NULL)
2570 qp = next;
2571 qp->l_next = &com->obufs[1];
2572 } else {
2573 com->obufq.l_head = com->obufs[1].l_head;
2574 com->obufq.l_tail = com->obufs[1].l_tail;
2575 com->obufq.l_next = &com->obufs[1];
2576 com->state |= CS_BUSY;
2577 }
2578 com_unlock();
2579 }
2580 tp->t_state |= TS_BUSY;
2581 }
2582 com_lock();
2583 if (com->state >= (CS_BUSY | CS_TTGO))
2584 siointr1(com); /* fake interrupt to start output */
2585 com_unlock();
2586 ttwwakeup(tp);
2587 crit_exit();
2588 lwkt_reltoken(&tty_token);
2589 }
2590
2591 static void
2592 comstop(struct tty *tp, int rw)
2593 {
2594 struct com_s *com;
2595
2596 lwkt_gettoken(&tty_token);
2597 com = com_addr(DEV_TO_UNIT(tp->t_dev));
2598 if (com == NULL || com->gone) {
2599 lwkt_reltoken(&tty_token);
2600 return;
2601 }
2602 com_lock();
2603 if (rw & FWRITE) {
2604 if (com->hasfifo)
2605 #ifdef COM_ESP
2606 /* XXX avoid h/w bug. */
2607 if (!com->esp)
2608 #endif
2609 sio_setreg(com, com_fifo,
2610 FIFO_XMT_RST | com->fifo_image);
2611 com->obufs[0].l_queued = FALSE;
2612 com->obufs[1].l_queued = FALSE;
2613 if (com->state & CS_ODONE)
2614 com_events -= LOTS_OF_EVENTS;
2615 com->state &= ~(CS_ODONE | CS_BUSY);
2616 com->tp->t_state &= ~TS_BUSY;
2617 }
2618 if (rw & FREAD) {
2619 if (com->hasfifo)
2620 #ifdef COM_ESP
2621 /* XXX avoid h/w bug. */
2622 if (!com->esp)
2623 #endif
2624 sio_setreg(com, com_fifo,
2625 FIFO_RCV_RST | com->fifo_image);
2626 com_events -= (com->iptr - com->ibuf);
2627 com->iptr = com->ibuf;
2628 }
2629 com_unlock();
2630 comstart(tp);
2631 lwkt_reltoken(&tty_token);
2632 }
2633
2634 static int
2635 commctl(struct com_s *com, int bits, int how)
2636 {
2637 int mcr;
2638 int msr;
2639
2640 lwkt_gettoken(&tty_token);
2641 if (how == DMGET) {
2642 bits = TIOCM_LE; /* XXX - always enabled while open */
2643 mcr = com->mcr_image;
2644 if (mcr & MCR_DTR)
2645 bits |= TIOCM_DTR;
2646 if (mcr & MCR_RTS)
2647 bits |= TIOCM_RTS;
2648 msr = com->prev_modem_status;
2649 if (msr & MSR_CTS)
2650 bits |= TIOCM_CTS;
2651 if (msr & MSR_DCD)
2652 bits |= TIOCM_CD;
2653 if (msr & MSR_DSR)
2654 bits |= TIOCM_DSR;
2655 /*
2656 * XXX - MSR_RI is naturally volatile, and we make MSR_TERI
2657 * more volatile by reading the modem status a lot. Perhaps
2658 * we should latch both bits until the status is read here.
2659 */
2660 if (msr & (MSR_RI | MSR_TERI))
2661 bits |= TIOCM_RI;
2662 lwkt_reltoken(&tty_token);
2663 return (bits);
2664 }
2665 mcr = 0;
2666 if (bits & TIOCM_DTR)
2667 mcr |= MCR_DTR;
2668 if (bits & TIOCM_RTS)
2669 mcr |= MCR_RTS;
2670 if (com->gone) {
2671 lwkt_reltoken(&tty_token);
2672 return(0);
2673 }
2674 com_lock();
2675 switch (how) {
2676 case DMSET:
2677 outb(com->modem_ctl_port,
2678 com->mcr_image = mcr | (com->mcr_image & MCR_IENABLE));
2679 break;
2680 case DMBIS:
2681 outb(com->modem_ctl_port, com->mcr_image |= mcr);
2682 break;
2683 case DMBIC:
2684 outb(com->modem_ctl_port, com->mcr_image &= ~mcr);
2685 break;
2686 }
2687 com_unlock();
2688 lwkt_reltoken(&tty_token);
2689 return (0);
2690 }
2691
2692 /*
2693 * NOTE: Must be called with tty_token held
2694 */
2695 static void
2696 siosettimeout(void)
2697 {
2698 struct com_s *com;
2699 bool_t someopen;
2700 int unit;
2701
2702 ASSERT_LWKT_TOKEN_HELD(&tty_token);
2703 /*
2704 * Set our timeout period to 1 second if no polled devices are open.
2705 * Otherwise set it to max(1/200, 1/hz).
2706 * Enable timeouts iff some device is open.
2707 */
2708 callout_stop(&sio_timeout_handle);
2709 sio_timeout = hz;
2710 someopen = FALSE;
2711 for (unit = 0; unit < sio_numunits; ++unit) {
2712 com = com_addr(unit);
2713 if (com != NULL && com->tp != NULL
2714 && com->tp->t_state & TS_ISOPEN && !com->gone) {
2715 someopen = TRUE;
2716 if (com->poll || com->poll_output) {
2717 sio_timeout = hz > 200 ? hz / 200 : 1;
2718 break;
2719 }
2720 }
2721 }
2722 if (someopen) {
2723 sio_timeouts_until_log = hz / sio_timeout;
2724 callout_reset(&sio_timeout_handle, sio_timeout,
2725 comwakeup, NULL);
2726 } else {
2727 /* Flush error messages, if any. */
2728 sio_timeouts_until_log = 1;
2729 comwakeup(NULL);
2730 callout_stop(&sio_timeout_handle);
2731 }
2732 }
2733
2734 /*
2735 * NOTE: Must be called with tty_token held
2736 */
2737 static void
2738 comwakeup(void *chan)
2739 {
2740 struct com_s *com;
2741 int unit;
2742
2743 /*
2744 * Can be called from a callout too so just get the token
2745 */
2746 lwkt_gettoken(&tty_token);
2747 callout_reset(&sio_timeout_handle, sio_timeout, comwakeup, NULL);
2748
2749 /*
2750 * Recover from lost output interrupts.
2751 * Poll any lines that don't use interrupts.
2752 */
2753 for (unit = 0; unit < sio_numunits; ++unit) {
2754 com = com_addr(unit);
2755 if (com != NULL && !com->gone
2756 && (com->state >= (CS_BUSY | CS_TTGO) || com->poll)) {
2757 com_lock();
2758 siointr1(com);
2759 com_unlock();
2760 }
2761 }
2762
2763 /*
2764 * Check for and log errors, but not too often.
2765 */
2766 if (--sio_timeouts_until_log > 0) {
2767 lwkt_reltoken(&tty_token);
2768 return;
2769 }
2770 sio_timeouts_until_log = hz / sio_timeout;
2771 for (unit = 0; unit < sio_numunits; ++unit) {
2772 int errnum;
2773
2774 com = com_addr(unit);
2775 if (com == NULL)
2776 continue;
2777 if (com->gone)
2778 continue;
2779 for (errnum = 0; errnum < CE_NTYPES; ++errnum) {
2780 u_int delta;
2781 u_long total;
2782
2783 com_lock();
2784 delta = com->delta_error_counts[errnum];
2785 com->delta_error_counts[errnum] = 0;
2786 com_unlock();
2787 if (delta == 0)
2788 continue;
2789 total = com->error_counts[errnum] += delta;
2790 log(LOG_ERR, "sio%d: %u more %s%s (total %lu)\n",
2791 unit, delta, error_desc[errnum],
2792 delta == 1 ? "" : "s", total);
2793 }
2794 }
2795 lwkt_reltoken(&tty_token);
2796 }
2797
2798 static void
2799 disc_optim(struct tty *tp, struct termios *t, struct com_s *com)
2800 {
2801 lwkt_gettoken(&tty_token);
2802 if (!(t->c_iflag & (ICRNL | IGNCR | IMAXBEL | INLCR | ISTRIP | IXON))
2803 && (!(t->c_iflag & BRKINT) || (t->c_iflag & IGNBRK))
2804 && (!(t->c_iflag & PARMRK)
2805 || (t->c_iflag & (IGNPAR | IGNBRK)) == (IGNPAR | IGNBRK))
2806 && !(t->c_lflag & (ECHO | ICANON | IEXTEN | ISIG | PENDIN))
2807 && linesw[tp->t_line].l_rint == ttyinput)
2808 tp->t_state |= TS_CAN_BYPASS_L_RINT;
2809 else
2810 tp->t_state &= ~TS_CAN_BYPASS_L_RINT;
2811 com->hotchar = linesw[tp->t_line].l_hotchar;
2812 lwkt_reltoken(&tty_token);
2813 }
2814
2815 /*
2816 * Following are all routines needed for SIO to act as console
2817 */
2818 #include <sys/cons.h>
2819
2820 struct siocnstate {
2821 u_char dlbl;
2822 u_char dlbh;
2823 u_char ier;
2824 u_char cfcr;
2825 u_char mcr;
2826 };
2827
2828 static speed_t siocngetspeed (Port_t, u_long rclk);
2829 #if 0
2830 static void siocnclose (struct siocnstate *sp, Port_t iobase);
2831 #endif
2832 static void siocnopen (struct siocnstate *sp, Port_t iobase, int speed);
2833 static void siocntxwait (Port_t iobase);
2834
2835 static cn_probe_t siocnprobe;
2836 static cn_init_t siocninit;
2837 static cn_init_fini_t siocninit_fini;
2838 static cn_checkc_t siocncheckc;
2839 static cn_getc_t siocngetc;
2840 static cn_putc_t siocnputc;
2841
2842 #if defined(__i386__) || defined(__x86_64__)
2843 CONS_DRIVER(sio, siocnprobe, siocninit, siocninit_fini,
2844 NULL, siocngetc, siocncheckc, siocnputc, NULL, NULL);
2845 #endif
2846
2847 /* To get the GDB related variables */
2848 #if DDB > 0
2849 #include <ddb/ddb.h>
2850 #endif
2851
2852 static void
2853 siocntxwait(Port_t iobase)
2854 {
2855 int timo;
2856
2857 /*
2858 * Wait for any pending transmission to finish. Required to avoid
2859 * the UART lockup bug when the speed is changed, and for normal
2860 * transmits.
2861 */
2862 timo = 100000;
2863 while ((inb(iobase + com_lsr) & (LSR_TSRE | LSR_TXRDY))
2864 != (LSR_TSRE | LSR_TXRDY) && --timo != 0)
2865 ;
2866 }
2867
2868 /*
2869 * Read the serial port specified and try to figure out what speed
2870 * it's currently running at. We're assuming the serial port has
2871 * been initialized and is basicly idle. This routine is only intended
2872 * to be run at system startup.
2873 *
2874 * If the value read from the serial port doesn't make sense, return 0.
2875 */
2876 /*
2877 * NOTE: Must be called with tty_token held
2878 */
2879 static speed_t
2880 siocngetspeed(Port_t iobase, u_long rclk)
2881 {
2882 u_int divisor;
2883 u_char dlbh;
2884 u_char dlbl;
2885 u_char cfcr;
2886
2887 cfcr = inb(iobase + com_cfcr);
2888 outb(iobase + com_cfcr, CFCR_DLAB | cfcr);
2889
2890 dlbl = inb(iobase + com_dlbl);
2891 dlbh = inb(iobase + com_dlbh);
2892
2893 outb(iobase + com_cfcr, cfcr);
2894
2895 divisor = dlbh << 8 | dlbl;
2896
2897 /* XXX there should be more sanity checking. */
2898 if (divisor == 0)
2899 return (CONSPEED);
2900 return (rclk / (16UL * divisor));
2901 }
2902
2903 static void
2904 siocnopen(struct siocnstate *sp, Port_t iobase, int speed)
2905 {
2906 u_int divisor;
2907 u_char dlbh;
2908 u_char dlbl;
2909
2910 /*
2911 * Save all the device control registers except the fifo register
2912 * and set our default ones (cs8 -parenb speed=comdefaultrate).
2913 * We can't save the fifo register since it is read-only.
2914 */
2915 sp->ier = inb(iobase + com_ier);
2916 outb(iobase + com_ier, 0); /* spltty() doesn't stop siointr() */
2917 siocntxwait(iobase);
2918 sp->cfcr = inb(iobase + com_cfcr);
2919 outb(iobase + com_cfcr, CFCR_DLAB | CFCR_8BITS);
2920 sp->dlbl = inb(iobase + com_dlbl);
2921 sp->dlbh = inb(iobase + com_dlbh);
2922 /*
2923 * Only set the divisor registers if they would change, since on
2924 * some 16550 incompatibles (Startech), setting them clears the
2925 * data input register. This also reduces the effects of the
2926 * UMC8669F bug.
2927 */
2928 divisor = siodivisor(comdefaultrclk, speed);
2929 dlbl = divisor & 0xFF;
2930 if (sp->dlbl != dlbl)
2931 outb(iobase + com_dlbl, dlbl);
2932 dlbh = divisor >> 8;
2933 if (sp->dlbh != dlbh)
2934 outb(iobase + com_dlbh, dlbh);
2935 outb(iobase + com_cfcr, CFCR_8BITS);
2936 sp->mcr = inb(iobase + com_mcr);
2937 /*
2938 * We don't want interrupts, but must be careful not to "disable"
2939 * them by clearing the MCR_IENABLE bit, since that might cause
2940 * an interrupt by floating the IRQ line.
2941 */
2942 outb(iobase + com_mcr, (sp->mcr & MCR_IENABLE) | MCR_DTR | MCR_RTS);
2943 }
2944
2945 #if 0
2946 static void
2947 siocnclose(struct siocnstate *sp, Port_t iobase)
2948 {
2949 /*
2950 * Restore the device control registers.
2951 */
2952 siocntxwait(iobase);
2953 outb(iobase + com_cfcr, CFCR_DLAB | CFCR_8BITS);
2954 if (sp->dlbl != inb(iobase + com_dlbl))
2955 outb(iobase + com_dlbl, sp->dlbl);
2956 if (sp->dlbh != inb(iobase + com_dlbh))
2957 outb(iobase + com_dlbh, sp->dlbh);
2958 outb(iobase + com_cfcr, sp->cfcr);
2959 /*
2960 * XXX damp oscillations of MCR_DTR and MCR_RTS by not restoring them.
2961 */
2962 outb(iobase + com_mcr, sp->mcr | MCR_DTR | MCR_RTS);
2963 outb(iobase + com_ier, sp->ier);
2964 }
2965 #endif
2966
2967 static void
2968 siocnprobe(struct consdev *cp)
2969 {
2970 u_char cfcr;
2971 u_int divisor;
2972 int unit;
2973 struct siocnstate sp;
2974
2975 /*
2976 * Find our first enabled console, if any. If it is a high-level
2977 * console device, then initialize it and return successfully.
2978 * If it is a low-level console device, then initialize it and
2979 * return unsuccessfully. It must be initialized in both cases
2980 * for early use by console drivers and debuggers. Initializing
2981 * the hardware is not necessary in all cases, since the i/o
2982 * routines initialize it on the fly, but it is necessary if
2983 * input might arrive while the hardware is switched back to an
2984 * uninitialized state. We can't handle multiple console devices
2985 * yet because our low-level routines don't take a device arg.
2986 * We trust the user to set the console flags properly so that we
2987 * don't need to probe.
2988 */
2989 cp->cn_pri = CN_DEAD;
2990
2991 for (unit = 0; unit < 16; unit++) { /* XXX need to know how many */
2992 int flags;
2993 int disabled;
2994 if (resource_int_value("sio", unit, "disabled", &disabled) == 0) {
2995 if (disabled)
2996 continue;
2997 }
2998 if (resource_int_value("sio", unit, "flags", &flags))
2999 continue;
3000 if (COM_CONSOLE(flags) || COM_DEBUGGER(flags)) {
3001 int port;
3002 int baud;
3003 Port_t iobase;
3004 speed_t boot_speed;
3005
3006 if (resource_int_value("sio", unit, "port", &port))
3007 continue;
3008 if (resource_int_value("sio", unit, "baud", &baud) == 0)
3009 boot_speed = baud;
3010 else
3011 boot_speed = 0;
3012 iobase = port;
3013 crit_enter();
3014 if (boothowto & RB_SERIAL) {
3015 if (boot_speed == 0) {
3016 boot_speed = siocngetspeed(iobase,
3017 comdefaultrclk);
3018 }
3019 if (boot_speed)
3020 comdefaultrate = boot_speed;
3021 }
3022
3023 /*
3024 * Initialize the divisor latch. We can't rely on
3025 * siocnopen() to do this the first time, since it
3026 * avoids writing to the latch if the latch appears
3027 * to have the correct value. Also, if we didn't
3028 * just read the speed from the hardware, then we
3029 * need to set the speed in hardware so that
3030 * switching it later is null.
3031 */
3032 com_lock();
3033 cfcr = inb(iobase + com_cfcr);
3034 outb(iobase + com_cfcr, CFCR_DLAB | cfcr);
3035 divisor = siodivisor(comdefaultrclk, comdefaultrate);
3036 outb(iobase + com_dlbl, divisor & 0xff);
3037 outb(iobase + com_dlbh, divisor >> 8);
3038 outb(iobase + com_cfcr, cfcr);
3039
3040 siocnopen(&sp, iobase, comdefaultrate);
3041 com_unlock();
3042
3043 crit_exit();
3044 if (COM_CONSOLE(flags) && !COM_LLCONSOLE(flags)) {
3045 cp->cn_probegood = 1;
3046 cp->cn_private = (void *)(intptr_t)unit;
3047 cp->cn_pri = COM_FORCECONSOLE(flags)
3048 || boothowto & RB_SERIAL
3049 ? CN_REMOTE : CN_NORMAL;
3050 siocniobase = iobase;
3051 siocnunit = unit;
3052 }
3053 if (COM_DEBUGGER(flags) && gdb_tab == NULL) {
3054 kprintf("sio%d: gdb debugging port\n", unit);
3055 siogdbiobase = iobase;
3056 siogdbunit = unit;
3057 #if DDB > 0
3058 cp->cn_gdbprivate = (void *)(intptr_t)unit;
3059 gdb_tab = cp;
3060 #endif
3061 }
3062 }
3063 }
3064 #if defined(__i386__) || defined(__x86_64__)
3065 #if DDB > 0
3066 /*
3067 * XXX Ugly Compatibility.
3068 * If no gdb port has been specified, set it to be the console
3069 * as some configuration files don't specify the gdb port.
3070 */
3071 if (gdb_tab == NULL && (boothowto & RB_GDB)) {
3072 kprintf("Warning: no GDB port specified. Defaulting to sio%d.\n",
3073 siocnunit);
3074 kprintf("Set flag 0x80 on desired GDB port in your\n");
3075 kprintf("configuration file (currently sio only).\n");
3076 siogdbiobase = siocniobase;
3077 siogdbunit = siocnunit;
3078 cp->cn_gdbprivate = (void *)(intptr_t)siocnunit;
3079 gdb_tab = cp;
3080 }
3081 #endif
3082 #endif
3083 }
3084
3085 static void
3086 siocninit(struct consdev *cp)
3087 {
3088 comconsole = (int)(intptr_t)cp->cn_private;
3089 }
3090
3091 static void
3092 siocninit_fini(struct consdev *cp)
3093 {
3094 cdev_t dev;
3095 int unit;
3096
3097 if (cp->cn_probegood) {
3098 unit = (int)(intptr_t)cp->cn_private;
3099 /*
3100 * Call devfs_find_device_by_name on ttydX to find the correct device,
3101 * as it should have been created already at this point by the
3102 * attach routine.
3103 * If it isn't found, the serial port was not attached at all and we
3104 * shouldn't be here, so assert this case.
3105 */
3106 dev = devfs_find_device_by_name("ttyd%r", unit);
3107
3108 KKASSERT(dev != NULL);
3109 cp->cn_dev = dev;
3110 }
3111 }
3112
3113 static int
3114 siocncheckc(void *private)
3115 {
3116 int c;
3117 int unit = (int)(intptr_t)private;
3118 Port_t iobase;
3119 #if 0
3120 struct siocnstate sp;
3121 #endif
3122
3123 if (unit == siogdbunit)
3124 iobase = siogdbiobase;
3125 else
3126 iobase = siocniobase;
3127 com_lock();
3128 crit_enter();
3129 #if 0
3130 siocnopen(&sp, iobase, comdefaultrate);
3131 #endif
3132 if (inb(iobase + com_lsr) & LSR_RXRDY)
3133 c = inb(iobase + com_data);
3134 else
3135 c = -1;
3136 #if 0
3137 siocnclose(&sp, iobase);
3138 #endif
3139 crit_exit();
3140 com_unlock();
3141 return (c);
3142 }
3143
3144
3145 static int
3146 siocngetc(void *private)
3147 {
3148 int c;
3149 int unit = (int)(intptr_t)private;
3150 Port_t iobase;
3151 #if 0
3152 struct siocnstate sp;
3153 #endif
3154
3155 if (unit == siogdbunit)
3156 iobase = siogdbiobase;
3157 else
3158 iobase = siocniobase;
3159 com_lock();
3160 crit_enter();
3161 #if 0
3162 siocnopen(&sp, iobase, comdefaultrate);
3163 #endif
3164 while (!(inb(iobase + com_lsr) & LSR_RXRDY))
3165 ;
3166 c = inb(iobase + com_data);
3167 #if 0
3168 siocnclose(&sp, iobase);
3169 #endif
3170 crit_exit();
3171 com_unlock();
3172 return (c);
3173 }
3174
3175 static void
3176 siocnputc(void *private, int c)
3177 {
3178 int unit = (int)(intptr_t)private;
3179 #if 0
3180 struct siocnstate sp;
3181 #endif
3182 Port_t iobase;
3183
3184 if (unit == siogdbunit)
3185 iobase = siogdbiobase;
3186 else
3187 iobase = siocniobase;
3188 com_lock();
3189 crit_enter();
3190 #if 0
3191 siocnopen(&sp, iobase, comdefaultrate);
3192 #endif
3193 siocntxwait(iobase);
3194 outb(iobase + com_data, c);
3195 #if 0
3196 siocnclose(&sp, iobase);
3197 #endif
3198 crit_exit();
3199 com_unlock();
3200 }
3201
3202 DRIVER_MODULE(sio, isa, sio_isa_driver, sio_devclass, NULL, NULL);
3203 DRIVER_MODULE(sio, acpi, sio_isa_driver, sio_devclass, NULL, NULL);
3204 #if NPCI > 0
3205 DRIVER_MODULE(sio, pci, sio_pci_driver, sio_devclass, NULL, NULL);
3206 #endif
3207 #if NPUC > 0
3208 DRIVER_MODULE(sio, puc, sio_puc_driver, sio_devclass, NULL, NULL);
3209 #endif
DragonFly BSD