4 * Copyright (c) 1991 The Regents of the University of California.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by the University of
18 * California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * $FreeBSD: src/sys/isa/sio.c,v 1.291.2.35 2003/05/18 08:51:15 murray Exp $
36 * $DragonFly: src/sys/dev/serial/sio/sio.c,v 1.44 2008/07/23 16:39:33 dillon Exp $
37 * from: @(#)com.c 7.5 (Berkeley) 5/16/91
38 * from: i386/isa sio.c,v 1.234
41 #include "opt_comconsole.h"
42 #include "opt_compat.h"
52 * Serial driver, based on 386BSD-0.1 com driver.
53 * Mostly rewritten to use pseudo-DMA.
54 * Works for National Semiconductor NS8250-NS16550AF UARTs.
55 * COM driver, based on HP dca driver.
57 * Changes for PC-Card integration:
58 * - Added PC-Card driver table and handlers
60 #include <sys/param.h>
61 #include <sys/systm.h>
62 #include <sys/reboot.h>
63 #include <sys/malloc.h>
67 #include <sys/module.h>
69 #include <sys/dkstat.h>
70 #include <sys/fcntl.h>
71 #include <sys/interrupt.h>
72 #include <sys/kernel.h>
73 #include <sys/syslog.h>
74 #include <sys/sysctl.h>
77 #include <sys/timepps.h>
78 #include <sys/thread2.h>
79 #include <sys/devfs.h>
81 #include <machine/limits.h>
83 #include <bus/isa/isareg.h>
84 #include <bus/isa/isavar.h>
86 #include <bus/pci/pcireg.h>
87 #include <bus/pci/pcivar.h>
90 #include <dev/misc/puc/pucvar.h>
92 #include <machine/lock.h>
94 #include <machine/clock.h>
96 #include <machine/lock.h>
100 #include "sio_private.h"
103 #include "../ic_layer/esp.h"
106 #define LOTS_OF_EVENTS 64 /* helps separate urgent events from input */
108 #define CALLOUT_MASK 0x80
109 #define CONTROL_MASK 0x60
110 #define CONTROL_INIT_STATE 0x20
111 #define CONTROL_LOCK_STATE 0x40
112 #define DEV_TO_UNIT(dev) (MINOR_TO_UNIT(minor(dev)))
113 #define MINOR_TO_UNIT(mynor) ((((mynor) & ~0xffffU) >> (8 + 3)) \
115 #define UNIT_TO_MINOR(unit) ((((unit) & ~0x1fU) << (8 + 3)) \
118 #define com_scr 7 /* scratch register for 16450-16550 (R/W) */
120 #define sio_getreg(com, off) \
121 (bus_space_read_1((com)->bst, (com)->bsh, (off)))
122 #define sio_setreg(com, off, value) \
123 (bus_space_write_1((com)->bst, (com)->bsh, (off), (value)))
127 * (CS_BUSY | CS_TTGO) and (CS_BUSY | CS_TTGO | CS_ODEVREADY) must be higher
128 * than the other bits so that they can be tested as a group without masking
131 * The following com and tty flags correspond closely:
132 * CS_BUSY = TS_BUSY (maintained by comstart(), siopoll() and
134 * CS_TTGO = ~TS_TTSTOP (maintained by comparam() and comstart())
135 * CS_CTS_OFLOW = CCTS_OFLOW (maintained by comparam())
136 * CS_RTS_IFLOW = CRTS_IFLOW (maintained by comparam())
137 * TS_FLUSH is not used.
138 * XXX I think TIOCSETA doesn't clear TS_TTSTOP when it clears IXON.
139 * XXX CS_*FLOW should be CF_*FLOW in com->flags (control flags not state).
141 #define CS_BUSY 0x80 /* output in progress */
142 #define CS_TTGO 0x40 /* output not stopped by XOFF */
143 #define CS_ODEVREADY 0x20 /* external device h/w ready (CTS) */
144 #define CS_CHECKMSR 1 /* check of MSR scheduled */
145 #define CS_CTS_OFLOW 2 /* use CTS output flow control */
146 #define CS_DTR_OFF 0x10 /* DTR held off */
147 #define CS_ODONE 4 /* output completed */
148 #define CS_RTS_IFLOW 8 /* use RTS input flow control */
149 #define CSE_BUSYCHECK 1 /* siobusycheck() scheduled */
151 static char const * const error_desc[] = {
154 #define CE_INTERRUPT_BUF_OVERFLOW 1
155 "interrupt-level buffer overflow",
156 #define CE_TTY_BUF_OVERFLOW 2
157 "tty-level buffer overflow",
161 static int espattach (struct com_s *com, Port_t esp_port);
163 static int sio_isa_attach (device_t dev);
165 static timeout_t siobusycheck;
166 static u_int siodivisor (u_long rclk, speed_t speed);
167 static timeout_t siodtrwakeup;
168 static void comhardclose (struct com_s *com);
169 static void sioinput (struct com_s *com);
170 static void siointr1 (struct com_s *com);
171 static void siointr (void *arg);
172 static int commctl (struct com_s *com, int bits, int how);
173 static int comparam (struct tty *tp, struct termios *t);
174 static inthand2_t siopoll;
175 static int sio_isa_probe (device_t dev);
176 static void siosettimeout (void);
177 static int siosetwater (struct com_s *com, speed_t speed);
178 static void comstart (struct tty *tp);
179 static void comstop (struct tty *tp, int rw);
180 static timeout_t comwakeup;
181 static void disc_optim (struct tty *tp, struct termios *t,
185 static int sio_pci_attach (device_t dev);
186 static void sio_pci_kludge_unit (device_t dev);
187 static int sio_pci_probe (device_t dev);
188 #endif /* NPCI > 0 */
191 static int sio_puc_attach (device_t dev);
192 static int sio_puc_probe (device_t dev);
193 #endif /* NPUC > 0 */
195 static char driver_name[] = "sio";
197 /* table and macro for fast conversion from a unit number to its com struct */
198 devclass_t sio_devclass;
199 #define com_addr(unit) ((struct com_s *) \
200 devclass_get_softc(sio_devclass, unit))
202 static device_method_t sio_isa_methods[] = {
203 /* Device interface */
204 DEVMETHOD(device_probe, sio_isa_probe),
205 DEVMETHOD(device_attach, sio_isa_attach),
210 static driver_t sio_isa_driver = {
213 sizeof(struct com_s),
217 static device_method_t sio_pci_methods[] = {
218 /* Device interface */
219 DEVMETHOD(device_probe, sio_pci_probe),
220 DEVMETHOD(device_attach, sio_pci_attach),
225 static driver_t sio_pci_driver = {
228 sizeof(struct com_s),
230 #endif /* NPCI > 0 */
233 static device_method_t sio_puc_methods[] = {
234 /* Device interface */
235 DEVMETHOD(device_probe, sio_puc_probe),
236 DEVMETHOD(device_attach, sio_puc_attach),
241 static driver_t sio_puc_driver = {
244 sizeof(struct com_s),
246 #endif /* NPUC > 0 */
248 static d_open_t sioopen;
249 static d_close_t sioclose;
250 static d_read_t sioread;
251 static d_write_t siowrite;
252 static d_ioctl_t sioioctl;
254 #define CDEV_MAJOR 28
255 static struct dev_ops sio_ops = {
256 { driver_name, CDEV_MAJOR, D_TTY },
262 .d_kqfilter = ttykqfilter,
263 .d_revoke = ttyrevoke
267 static volatile speed_t comdefaultrate = CONSPEED;
268 static u_long comdefaultrclk = DEFAULT_RCLK;
269 SYSCTL_ULONG(_machdep, OID_AUTO, conrclk, CTLFLAG_RW, &comdefaultrclk, 0, "");
270 static u_int com_events; /* input chars + weighted output completions */
271 static Port_t siocniobase;
272 static int siocnunit;
273 static Port_t siogdbiobase;
274 static int siogdbunit = -1;
275 static bool_t sio_registered;
276 static int sio_timeout;
277 static int sio_timeouts_until_log;
278 static struct callout sio_timeout_handle;
279 static int sio_numunits;
282 /* XXX configure this properly. */
283 static Port_t likely_com_ports[] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8, };
284 static Port_t likely_esp_ports[] = { 0x140, 0x180, 0x280, 0 };
288 * handle sysctl read/write requests for console speed
290 * In addition to setting comdefaultrate for I/O through /dev/console,
291 * also set the initial and lock values for the /dev/ttyXX device
292 * if there is one associated with the console. Finally, if the /dev/tty
293 * device has already been open, change the speed on the open running port
298 sysctl_machdep_comdefaultrate(SYSCTL_HANDLER_ARGS)
305 lwkt_gettoken(&tty_token);
306 newspeed = comdefaultrate;
308 error = sysctl_handle_opaque(oidp, &newspeed, sizeof newspeed, req);
309 if (error || !req->newptr) {
310 lwkt_reltoken(&tty_token);
314 comdefaultrate = newspeed;
316 if (comconsole < 0) { /* serial console not selected? */
317 lwkt_reltoken(&tty_token);
321 com = com_addr(comconsole);
323 lwkt_reltoken(&tty_token);
328 * set the initial and lock rates for /dev/ttydXX and /dev/cuaXX
329 * (note, the lock rates really are boolean -- if non-zero, disallow
332 com->it_in.c_ispeed = com->it_in.c_ospeed =
333 com->lt_in.c_ispeed = com->lt_in.c_ospeed =
334 com->it_out.c_ispeed = com->it_out.c_ospeed =
335 com->lt_out.c_ispeed = com->lt_out.c_ospeed = comdefaultrate;
338 * if we're open, change the running rate too
341 if (tp && (tp->t_state & TS_ISOPEN)) {
342 tp->t_termios.c_ispeed =
343 tp->t_termios.c_ospeed = comdefaultrate;
345 error = comparam(tp, &tp->t_termios);
348 lwkt_reltoken(&tty_token);
352 SYSCTL_PROC(_machdep, OID_AUTO, conspeed, CTLTYPE_INT | CTLFLAG_RW,
353 0, 0, sysctl_machdep_comdefaultrate, "I", "");
362 static struct pci_ids pci_ids[] = {
363 { 0x100812b9, "3COM PCI FaxModem", 0x10 },
364 { 0x2000131f, "CyberSerial (1-port) 16550", 0x10 },
365 { 0x01101407, "Koutech IOFLEX-2S PCI Dual Port Serial", 0x10 },
366 { 0x01111407, "Koutech IOFLEX-2S PCI Dual Port Serial", 0x10 },
367 { 0x048011c1, "Lucent kermit based PCI Modem", 0x14 },
368 { 0x95211415, "Oxford Semiconductor PCI Dual Port Serial", 0x10 },
369 { 0x7101135e, "SeaLevel Ultra 530.PCI Single Port Serial", 0x18 },
370 { 0x0000151f, "SmartLink 5634PCV SurfRider", 0x10 },
371 { 0x98459710, "Netmos Nm9845 PCI Bridge with Dual UART", 0x10 },
372 { 0x00000000, NULL, 0 }
376 sio_pci_attach(device_t dev)
381 type = pci_get_devid(dev);
383 while (id->type && id->type != type)
385 if (id->desc == NULL)
387 sio_pci_kludge_unit(dev);
388 return (sioattach(dev, id->rid, 0UL));
392 * Don't cut and paste this to other drivers. It is a horrible kludge
393 * which will fail to work and also be unnecessary in future versions.
396 sio_pci_kludge_unit(device_t dev)
405 while (resource_int_value("sio", unit, "port", &start) == 0 &&
408 if (device_get_unit(dev) < unit) {
409 dc = device_get_devclass(dev);
410 while (devclass_get_device(dc, unit))
412 device_printf(dev, "moving to sio%d\n", unit);
413 err = device_set_unit(dev, unit); /* EVIL DO NOT COPY */
415 device_printf(dev, "error moving device %d\n", err);
420 sio_pci_probe(device_t dev)
425 type = pci_get_devid(dev);
427 while (id->type && id->type != type)
429 if (id->desc == NULL)
431 device_set_desc(dev, id->desc);
432 return (sioprobe(dev, id->rid, 0UL));
434 #endif /* NPCI > 0 */
438 sio_puc_attach(device_t dev)
442 if (BUS_READ_IVAR(device_get_parent(dev), dev, PUC_IVAR_FREQ,
445 return (sioattach(dev, 0, rclk));
449 sio_puc_probe(device_t dev)
453 if (BUS_READ_IVAR(device_get_parent(dev), dev, PUC_IVAR_FREQ,
456 return (sioprobe(dev, 0, rclk));
460 static struct isa_pnp_id sio_ids[] = {
461 {0x0005d041, "Standard PC COM port"}, /* PNP0500 */
462 {0x0105d041, "16550A-compatible COM port"}, /* PNP0501 */
463 {0x0205d041, "Multiport serial device (non-intelligent 16550)"}, /* PNP0502 */
464 {0x1005d041, "Generic IRDA-compatible device"}, /* PNP0510 */
465 {0x1105d041, "Generic IRDA-compatible device"}, /* PNP0511 */
466 /* Devices that do not have a compatid */
467 {0x12206804, NULL}, /* ACH2012 - 5634BTS 56K Video Ready Modem */
468 {0x7602a904, NULL}, /* AEI0276 - 56K v.90 Fax Modem (LKT) */
469 {0x00007905, NULL}, /* AKY0000 - 56K Plug&Play Modem */
470 {0x21107905, NULL}, /* AKY1021 - 56K Plug&Play Modem */
471 {0x01405407, NULL}, /* AZT4001 - AZT3000 PnP SOUND DEVICE, MODEM */
472 {0x56039008, NULL}, /* BDP0356 - Best Data 56x2 */
473 {0x56159008, NULL}, /* BDP1556 - B.D. Smart One 56SPS,Voice Modem*/
474 {0x36339008, NULL}, /* BDP3336 - Best Data Prods. 336F */
475 {0x0014490a, NULL}, /* BRI1400 - Boca 33.6 PnP */
476 {0x0015490a, NULL}, /* BRI1500 - Internal Fax Data */
477 {0x0034490a, NULL}, /* BRI3400 - Internal ACF Modem */
478 {0x0094490a, NULL}, /* BRI9400 - Boca K56Flex PnP */
479 {0x00b4490a, NULL}, /* BRIB400 - Boca 56k PnP */
480 {0x0030320d, NULL}, /* CIR3000 - Cirrus Logic V43 */
481 {0x0100440e, NULL}, /* CRD0001 - Cardinal MVP288IV ? */
482 {0x01308c0e, NULL}, /* CTL3001 - Creative Labs Phoneblaster */
483 {0x36033610, NULL}, /* DAV0336 - DAVICOM 336PNP MODEM */
484 {0x01009416, NULL}, /* ETT0001 - E-Tech Bullet 33k6 PnP */
485 {0x0000aa1a, NULL}, /* FUJ0000 - FUJITSU Modem 33600 PNP/I2 */
486 {0x1200c31e, NULL}, /* GVC0012 - VF1128HV-R9 (win modem?) */
487 {0x0303c31e, NULL}, /* GVC0303 - MaxTech 33.6 PnP D/F/V */
488 {0x0505c31e, NULL}, /* GVC0505 - GVC 56k Faxmodem */
489 {0x0116c31e, NULL}, /* GVC1601 - Rockwell V.34 Plug & Play Modem */
490 {0x0050c31e, NULL}, /* GVC5000 - some GVC modem */
491 {0x3800f91e, NULL}, /* GWY0038 - Telepath with v.90 */
492 {0x9062f91e, NULL}, /* GWY6290 - Telepath with x2 Technology */
493 {0x8100e425, NULL}, /* IOD0081 - I-O DATA DEVICE,INC. IFML-560 */
494 {0x21002534, NULL}, /* MAE0021 - Jetstream Int V.90 56k Voice Series 2*/
495 {0x0000f435, NULL}, /* MOT0000 - Motorola ModemSURFR 33.6 Intern */
496 {0x5015f435, NULL}, /* MOT1550 - Motorola ModemSURFR 56K Modem */
497 {0xf015f435, NULL}, /* MOT15F0 - Motorola VoiceSURFR 56K Modem */
498 {0x6045f435, NULL}, /* MOT4560 - Motorola ? */
499 {0x61e7a338, NULL}, /* NECE761 - 33.6Modem */
500 {0x08804f3f, NULL}, /* OZO8008 - Zoom (33.6k Modem) */
501 {0x0f804f3f, NULL}, /* OZO800f - Zoom 2812 (56k Modem) */
502 {0x39804f3f, NULL}, /* OZO8039 - Zoom 56k flex */
503 {0x00914f3f, NULL}, /* OZO9100 - Zoom 2919 (K56 Faxmodem) */
504 {0x3024a341, NULL}, /* PMC2430 - Pace 56 Voice Internal Modem */
505 {0x1000eb49, NULL}, /* ROK0010 - Rockwell ? */
506 {0x1200b23d, NULL}, /* RSS0012 - OMRON ME5614ISA */
507 {0x5002734a, NULL}, /* RSS0250 - 5614Jx3(G) Internal Modem */
508 {0x6202734a, NULL}, /* RSS0262 - 5614Jx3[G] V90+K56Flex Modem */
509 {0x1010104d, NULL}, /* SHP1010 - Rockwell 33600bps Modem */
510 {0xc100ad4d, NULL}, /* SMM00C1 - Leopard 56k PnP */
511 {0x9012b04e, NULL}, /* SUP1290 - Supra ? */
512 {0x1013b04e, NULL}, /* SUP1310 - SupraExpress 336i PnP */
513 {0x8013b04e, NULL}, /* SUP1380 - SupraExpress 288i PnP Voice */
514 {0x8113b04e, NULL}, /* SUP1381 - SupraExpress 336i PnP Voice */
515 {0x5016b04e, NULL}, /* SUP1650 - Supra 336i Sp Intl */
516 {0x7016b04e, NULL}, /* SUP1670 - Supra 336i V+ Intl */
517 {0x7420b04e, NULL}, /* SUP2070 - Supra ? */
518 {0x8020b04e, NULL}, /* SUP2080 - Supra ? */
519 {0x8420b04e, NULL}, /* SUP2084 - SupraExpress 56i PnP */
520 {0x7121b04e, NULL}, /* SUP2171 - SupraExpress 56i Sp? */
521 {0x8024b04e, NULL}, /* SUP2480 - Supra ? */
522 {0x01007256, NULL}, /* USR0001 - U.S. Robotics Inc., Sportster W */
523 {0x02007256, NULL}, /* USR0002 - U.S. Robotics Inc. Sportster 33. */
524 {0x04007256, NULL}, /* USR0004 - USR Sportster 14.4k */
525 {0x06007256, NULL}, /* USR0006 - USR Sportster 33.6k */
526 {0x11007256, NULL}, /* USR0011 - USR ? */
527 {0x01017256, NULL}, /* USR0101 - USR ? */
528 {0x30207256, NULL}, /* USR2030 - U.S.Robotics Inc. Sportster 560 */
529 {0x50207256, NULL}, /* USR2050 - U.S.Robotics Inc. Sportster 33. */
530 {0x70207256, NULL}, /* USR2070 - U.S.Robotics Inc. Sportster 560 */
531 {0x30307256, NULL}, /* USR3030 - U.S. Robotics 56K FAX INT */
532 {0x31307256, NULL}, /* USR3031 - U.S. Robotics 56K FAX INT */
533 {0x50307256, NULL}, /* USR3050 - U.S. Robotics 56K FAX INT */
534 {0x70307256, NULL}, /* USR3070 - U.S. Robotics 56K Voice INT */
535 {0x90307256, NULL}, /* USR3090 - USR ? */
536 {0x70917256, NULL}, /* USR9170 - U.S. Robotics 56K FAX INT */
537 {0x90917256, NULL}, /* USR9190 - USR 56k Voice INT */
538 {0x0300695c, NULL}, /* WCI0003 - Fax/Voice/Modem/Speakphone/Asvd */
539 {0x01a0896a, NULL}, /* ZTIA001 - Zoom Internal V90 Faxmodem */
540 {0x61f7896a, NULL}, /* ZTIF761 - Zoom ComStar 33.6 */
547 sio_isa_probe(device_t dev)
549 /* Check isapnp ids */
550 if (ISA_PNP_PROBE(device_get_parent(dev), dev, sio_ids) == ENXIO)
552 return (sioprobe(dev, 0, 0UL));
556 sioprobe(device_t dev, int xrid, u_long rclk)
559 static bool_t already_init;
568 intrmask_t irqmap[4];
573 u_int flags = device_get_flags(dev);
575 struct resource *port;
578 port = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid,
579 0, ~0, IO_COMSIZE, RF_ACTIVE);
583 lwkt_gettoken(&tty_token);
584 com = device_get_softc(dev);
585 com->bst = rman_get_bustag(port);
586 com->bsh = rman_get_bushandle(port);
593 * XXX this is broken - when we are first called, there are no
594 * previously configured IO ports. We could hard code
595 * 0x3f8, 0x2f8, 0x3e8, 0x2e8 etc but that's probably worse.
596 * This code has been doing nothing since the conversion since
597 * "count" is zero the first time around.
601 * Turn off MCR_IENABLE for all likely serial ports. An unused
602 * port with its MCR_IENABLE gate open will inhibit interrupts
603 * from any used port that shares the interrupt vector.
604 * XXX the gate enable is elsewhere for some multiports.
607 int count, i, xioport;
609 devclass_get_devices(sio_devclass, &devs, &count);
610 for (i = 0; i < count; i++) {
612 if (device_is_enabled(xdev) &&
613 bus_get_resource(xdev, SYS_RES_IOPORT, 0, &xioport,
615 outb(xioport + com_mcr, 0);
622 if (COM_LLCONSOLE(flags)) {
623 kprintf("sio%d: reserved for low-level i/o\n",
624 device_get_unit(dev));
625 bus_release_resource(dev, SYS_RES_IOPORT, rid, port);
626 lwkt_reltoken(&tty_token);
631 * If the device is on a multiport card and has an AST/4
632 * compatible interrupt control register, initialize this
633 * register and prepare to leave MCR_IENABLE clear in the mcr.
634 * Otherwise, prepare to set MCR_IENABLE in the mcr.
635 * Point idev to the device struct giving the correct id_irq.
636 * This is the struct for the master device if there is one.
639 mcr_image = MCR_IENABLE;
641 if (COM_ISMULTIPORT(flags)) {
645 idev = devclass_get_device(sio_devclass, COM_MPMASTER(flags));
647 kprintf("sio%d: master device %d not configured\n",
648 device_get_unit(dev), COM_MPMASTER(flags));
651 if (!COM_NOTAST4(flags)) {
652 if (bus_get_resource(idev, SYS_RES_IOPORT, 0, &io,
655 if (bus_get_resource(idev, SYS_RES_IRQ, 0,
657 outb(xiobase + com_scr, 0x80);
659 outb(xiobase + com_scr, 0);
664 #endif /* COM_MULTIPORT */
665 if (bus_get_resource(idev, SYS_RES_IRQ, 0, NULL, NULL) != 0)
668 bzero(failures, sizeof failures);
669 iobase = rman_get_start(port);
672 * We don't want to get actual interrupts, just masked ones.
673 * Interrupts from this line should already be masked in the ICU,
674 * but mask them in the processor as well in case there are some
675 * (misconfigured) shared interrupts.
681 * For the TI16754 chips, set prescaler to 1 (4 is often the
682 * default after-reset value) as otherwise it's impossible to
683 * get highest baudrates.
685 if (COM_TI16754(flags)) {
688 cfcr = sio_getreg(com, com_cfcr);
689 sio_setreg(com, com_cfcr, CFCR_EFR_ENABLE);
690 efr = sio_getreg(com, com_efr);
691 /* Unlock extended features to turn off prescaler. */
692 sio_setreg(com, com_efr, efr | EFR_EFE);
694 sio_setreg(com, com_cfcr, (cfcr != CFCR_EFR_ENABLE) ? cfcr : 0);
695 /* Turn off prescaler. */
696 sio_setreg(com, com_mcr,
697 sio_getreg(com, com_mcr) & ~MCR_PRESCALE);
698 sio_setreg(com, com_cfcr, CFCR_EFR_ENABLE);
699 sio_setreg(com, com_efr, efr);
700 sio_setreg(com, com_cfcr, cfcr);
704 * Initialize the speed and the word size and wait long enough to
705 * drain the maximum of 16 bytes of junk in device output queues.
706 * The speed is undefined after a master reset and must be set
707 * before relying on anything related to output. There may be
708 * junk after a (very fast) soft reboot and (apparently) after
710 * XXX what about the UART bug avoided by waiting in comparam()?
711 * We don't want to to wait long enough to drain at 2 bps.
713 if (iobase == siocniobase) {
714 DELAY((16 + 1) * 1000000 / (comdefaultrate / 10));
716 sio_setreg(com, com_cfcr, CFCR_DLAB | CFCR_8BITS);
717 divisor = siodivisor(rclk, SIO_TEST_SPEED);
718 sio_setreg(com, com_dlbl, divisor & 0xff);
719 sio_setreg(com, com_dlbh, divisor >> 8);
720 sio_setreg(com, com_cfcr, CFCR_8BITS);
721 DELAY((16 + 1) * 1000000 / (SIO_TEST_SPEED / 10));
725 * Make sure we can drain the receiver. If we can't, the serial
726 * port may not exist.
728 for (fn = 0; fn < 256; ++fn) {
729 if ((sio_getreg(com, com_lsr) & LSR_RXRDY) == 0)
731 (void)sio_getreg(com, com_data);
734 kprintf("sio%d: can't drain, serial port might "
735 "not exist, disabling\n", device_get_unit(dev));
741 * Enable the interrupt gate and disable device interupts. This
742 * should leave the device driving the interrupt line low and
743 * guarantee an edge trigger if an interrupt can be generated.
746 sio_setreg(com, com_mcr, mcr_image);
747 sio_setreg(com, com_ier, 0);
748 DELAY(1000); /* XXX */
749 irqmap[0] = isa_irq_pending();
752 * Attempt to set loopback mode so that we can send a null byte
753 * without annoying any external device.
756 sio_setreg(com, com_mcr, mcr_image | MCR_LOOPBACK);
759 * Attempt to generate an output interrupt. On 8250's, setting
760 * IER_ETXRDY generates an interrupt independent of the current
761 * setting and independent of whether the THR is empty. On 16450's,
762 * setting IER_ETXRDY generates an interrupt independent of the
763 * current setting. On 16550A's, setting IER_ETXRDY only
764 * generates an interrupt when IER_ETXRDY is not already set.
766 sio_setreg(com, com_ier, IER_ETXRDY);
769 * On some 16x50 incompatibles, setting IER_ETXRDY doesn't generate
770 * an interrupt. They'd better generate one for actually doing
771 * output. Loopback may be broken on the same incompatibles but
772 * it's unlikely to do more than allow the null byte out.
774 sio_setreg(com, com_data, 0);
775 DELAY((1 + 2) * 1000000 / (SIO_TEST_SPEED / 10));
778 * Turn off loopback mode so that the interrupt gate works again
779 * (MCR_IENABLE was hidden). This should leave the device driving
780 * an interrupt line high. It doesn't matter if the interrupt
781 * line oscillates while we are not looking at it, since interrupts
785 sio_setreg(com, com_mcr, mcr_image);
788 * Some pcmcia cards have the "TXRDY bug", so we check everyone
789 * for IIR_TXRDY implementation ( Palido 321s, DC-1S... )
791 if (COM_NOPROBE(flags)) {
792 /* Reading IIR register twice */
793 for (fn = 0; fn < 2; fn ++) {
795 failures[6] = sio_getreg(com, com_iir);
797 /* Check IIR_TXRDY clear ? */
799 if (failures[6] & IIR_TXRDY) {
800 /* Nop, Double check with clearing IER */
801 sio_setreg(com, com_ier, 0);
802 if (sio_getreg(com, com_iir) & IIR_NOPEND) {
803 /* Ok. we're familia this gang */
804 SET_FLAG(dev, COM_C_IIR_TXRDYBUG);
806 /* Unknown, Just omit this chip.. XXX */
808 sio_setreg(com, com_mcr, 0);
811 /* OK. this is well-known guys */
812 CLR_FLAG(dev, COM_C_IIR_TXRDYBUG);
814 sio_setreg(com, com_ier, 0);
815 sio_setreg(com, com_cfcr, CFCR_8BITS);
817 bus_release_resource(dev, SYS_RES_IOPORT, rid, port);
818 lwkt_reltoken(&tty_token);
819 return (iobase == siocniobase ? 0 : result);
824 * o the CFCR, IER and MCR in UART hold the values written to them
825 * (the values happen to be all distinct - this is good for
826 * avoiding false positive tests from bus echoes).
827 * o an output interrupt is generated and its vector is correct.
828 * o the interrupt goes away when the IIR in the UART is read.
831 failures[0] = sio_getreg(com, com_cfcr) - CFCR_8BITS;
832 failures[1] = sio_getreg(com, com_ier) - IER_ETXRDY;
833 failures[2] = sio_getreg(com, com_mcr) - mcr_image;
834 DELAY(10000); /* Some internal modems need this time */
835 irqmap[1] = isa_irq_pending();
836 failures[4] = (sio_getreg(com, com_iir) & IIR_IMASK) - IIR_TXRDY;
837 DELAY(1000); /* XXX */
838 irqmap[2] = isa_irq_pending();
839 failures[6] = (sio_getreg(com, com_iir) & IIR_IMASK) - IIR_NOPEND;
842 * Turn off all device interrupts and check that they go off properly.
843 * Leave MCR_IENABLE alone. For ports without a master port, it gates
844 * the OUT2 output of the UART to
845 * the ICU input. Closing the gate would give a floating ICU input
846 * (unless there is another device driving it) and spurious interrupts.
847 * (On the system that this was first tested on, the input floats high
848 * and gives a (masked) interrupt as soon as the gate is closed.)
850 sio_setreg(com, com_ier, 0);
851 sio_setreg(com, com_cfcr, CFCR_8BITS); /* dummy to avoid bus echo */
852 failures[7] = sio_getreg(com, com_ier);
853 DELAY(1000); /* XXX */
854 irqmap[3] = isa_irq_pending();
855 failures[9] = (sio_getreg(com, com_iir) & IIR_IMASK) - IIR_NOPEND;
859 irqs = irqmap[1] & ~irqmap[0];
860 if (bus_get_resource(idev, SYS_RES_IRQ, 0, &xirq, NULL) == 0 &&
861 ((1 << xirq) & irqs) == 0)
863 "sio%d: configured irq %ld not in bitmap of probed irqs %#x\n",
864 device_get_unit(dev), xirq, irqs);
866 kprintf("sio%d: irq maps: %#x %#x %#x %#x\n",
867 device_get_unit(dev),
868 irqmap[0], irqmap[1], irqmap[2], irqmap[3]);
871 for (fn = 0; fn < sizeof failures; ++fn)
873 sio_setreg(com, com_mcr, 0);
876 kprintf("sio%d: probe failed test(s):",
877 device_get_unit(dev));
878 for (fn = 0; fn < sizeof failures; ++fn)
885 bus_release_resource(dev, SYS_RES_IOPORT, rid, port);
886 lwkt_reltoken(&tty_token);
887 return (iobase == siocniobase ? 0 : result);
892 espattach(struct com_s *com, Port_t esp_port)
898 * Check the ESP-specific I/O port to see if we're an ESP
899 * card. If not, return failure immediately.
901 if ((inb(esp_port) & 0xf3) == 0) {
902 kprintf(" port 0x%x is not an ESP board?\n", esp_port);
906 lwkt_gettoken(&tty_token);
908 * We've got something that claims to be a Hayes ESP card.
912 /* Get the dip-switch configuration */
913 outb(esp_port + ESP_CMD1, ESP_GETDIPS);
914 dips = inb(esp_port + ESP_STATUS1);
917 * Bits 0,1 of dips say which COM port we are.
919 if (rman_get_start(com->ioportres) == likely_com_ports[dips & 0x03])
922 kprintf(" esp_port has com %d\n", dips & 0x03);
923 lwkt_reltoken(&tty_token);
928 * Check for ESP version 2.0 or later: bits 4,5,6 = 010.
930 outb(esp_port + ESP_CMD1, ESP_GETTEST);
931 val = inb(esp_port + ESP_STATUS1); /* clear reg 1 */
932 val = inb(esp_port + ESP_STATUS2);
933 if ((val & 0x70) < 0x20) {
934 kprintf("-old (%o)", val & 0x70);
935 lwkt_reltoken(&tty_token);
940 * Check for ability to emulate 16550: bit 7 == 1
942 if ((dips & 0x80) == 0) {
944 lwkt_reltoken(&tty_token);
949 * Okay, we seem to be a Hayes ESP card. Whee.
952 com->esp_port = esp_port;
953 lwkt_reltoken(&tty_token);
959 sio_isa_attach(device_t dev)
961 return (sioattach(dev, 0, 0UL));
965 sioattach(device_t dev, int xrid, u_long rclk)
976 struct resource *port;
980 lwkt_gettoken(&tty_token);
983 callout_init_mp(&sio_timeout_handle);
987 port = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid,
988 0, ~0, IO_COMSIZE, RF_ACTIVE);
990 lwkt_reltoken(&tty_token);
994 iobase = rman_get_start(port);
995 unit = device_get_unit(dev);
996 com = device_get_softc(dev);
997 flags = device_get_flags(dev);
999 if (unit >= sio_numunits)
1000 sio_numunits = unit + 1;
1002 * sioprobe() has initialized the device registers as follows:
1003 * o cfcr = CFCR_8BITS.
1004 * It is most important that CFCR_DLAB is off, so that the
1005 * data port is not hidden when we enable interrupts.
1007 * Interrupts are only enabled when the line is open.
1008 * o mcr = MCR_IENABLE, or 0 if the port has AST/4 compatible
1009 * interrupt control register or the config specifies no irq.
1010 * Keeping MCR_DTR and MCR_RTS off might stop the external
1011 * device from sending before we are ready.
1013 bzero(com, sizeof *com);
1015 com->ioportres = port;
1016 com->bst = rman_get_bustag(port);
1017 com->bsh = rman_get_bushandle(port);
1018 com->cfcr_image = CFCR_8BITS;
1019 com->dtr_wait = 3 * hz;
1020 callout_init_mp(&com->dtr_ch);
1021 callout_init_mp(&com->busy_ch);
1022 com->loses_outints = COM_LOSESOUTINTS(flags) != 0;
1023 com->no_irq = bus_get_resource(dev, SYS_RES_IRQ, 0, NULL, NULL) != 0;
1024 com->tx_fifo_size = 1;
1025 com->obufs[0].l_head = com->obuf1;
1026 com->obufs[1].l_head = com->obuf2;
1028 com->data_port = iobase + com_data;
1029 com->int_id_port = iobase + com_iir;
1030 com->modem_ctl_port = iobase + com_mcr;
1031 com->mcr_image = inb(com->modem_ctl_port);
1032 com->line_status_port = iobase + com_lsr;
1033 com->modem_status_port = iobase + com_msr;
1034 com->intr_ctl_port = iobase + com_ier;
1037 rclk = DEFAULT_RCLK;
1041 * We don't use all the flags from <sys/ttydefaults.h> since they
1042 * are only relevant for logins. It's important to have echo off
1043 * initially so that the line doesn't start blathering before the
1044 * echo flag can be turned off.
1046 com->it_in.c_iflag = 0;
1047 com->it_in.c_oflag = 0;
1048 com->it_in.c_cflag = TTYDEF_CFLAG;
1049 com->it_in.c_lflag = 0;
1050 if (unit == comconsole) {
1051 com->it_in.c_iflag = TTYDEF_IFLAG;
1052 com->it_in.c_oflag = TTYDEF_OFLAG;
1053 com->it_in.c_cflag = TTYDEF_CFLAG | CLOCAL;
1054 com->it_in.c_lflag = TTYDEF_LFLAG;
1055 com->lt_out.c_cflag = com->lt_in.c_cflag = CLOCAL;
1056 com->lt_out.c_ispeed = com->lt_out.c_ospeed =
1057 com->lt_in.c_ispeed = com->lt_in.c_ospeed =
1058 com->it_in.c_ispeed = com->it_in.c_ospeed = comdefaultrate;
1060 com->it_in.c_ispeed = com->it_in.c_ospeed = TTYDEF_SPEED;
1061 if (siosetwater(com, com->it_in.c_ispeed) != 0) {
1064 * Leave i/o resources allocated if this is a `cn'-level
1065 * console, so that other devices can't snarf them.
1067 if (iobase != siocniobase)
1068 bus_release_resource(dev, SYS_RES_IOPORT, rid, port);
1069 lwkt_reltoken(&tty_token);
1073 termioschars(&com->it_in);
1074 com->it_out = com->it_in;
1076 /* attempt to determine UART type */
1077 kprintf("sio%d: type", unit);
1080 #ifdef COM_MULTIPORT
1081 if (!COM_ISMULTIPORT(flags) && !COM_IIR_TXRDYBUG(flags))
1083 if (!COM_IIR_TXRDYBUG(flags))
1090 scr = sio_getreg(com, com_scr);
1091 sio_setreg(com, com_scr, 0xa5);
1092 scr1 = sio_getreg(com, com_scr);
1093 sio_setreg(com, com_scr, 0x5a);
1094 scr2 = sio_getreg(com, com_scr);
1095 sio_setreg(com, com_scr, scr);
1096 if (scr1 != 0xa5 || scr2 != 0x5a) {
1098 goto determined_type;
1101 sio_setreg(com, com_fifo, FIFO_ENABLE | FIFO_RX_HIGH);
1104 switch (inb(com->int_id_port) & IIR_FIFO_MASK) {
1115 if (COM_NOFIFO(flags)) {
1116 kprintf(" 16550A fifo disabled");
1118 com->hasfifo = TRUE;
1119 if (COM_ST16650A(flags)) {
1121 com->tx_fifo_size = 32;
1122 kprintf(" ST16650A");
1123 } else if (COM_TI16754(flags)) {
1124 com->tx_fifo_size = 64;
1125 kprintf(" TI16754");
1127 com->tx_fifo_size = COM_FIFOSIZE(flags);
1132 for (espp = likely_esp_ports; *espp != 0; espp++)
1133 if (espattach(com, *espp)) {
1134 com->tx_fifo_size = 1024;
1138 if (!com->st16650a && !COM_TI16754(flags)) {
1139 if (!com->tx_fifo_size)
1140 com->tx_fifo_size = 16;
1142 kprintf(" lookalike with %d bytes FIFO",
1152 * Set 16550 compatibility mode.
1153 * We don't use the ESP_MODE_SCALE bit to increase the
1154 * fifo trigger levels because we can't handle large
1156 * XXX flow control should be set in comparam(), not here.
1158 outb(com->esp_port + ESP_CMD1, ESP_SETMODE);
1159 outb(com->esp_port + ESP_CMD2, ESP_MODE_RTS | ESP_MODE_FIFO);
1161 /* Set RTS/CTS flow control. */
1162 outb(com->esp_port + ESP_CMD1, ESP_SETFLOWTYPE);
1163 outb(com->esp_port + ESP_CMD2, ESP_FLOW_RTS);
1164 outb(com->esp_port + ESP_CMD2, ESP_FLOW_CTS);
1166 /* Set flow-control levels. */
1167 outb(com->esp_port + ESP_CMD1, ESP_SETRXFLOW);
1168 outb(com->esp_port + ESP_CMD2, HIBYTE(768));
1169 outb(com->esp_port + ESP_CMD2, LOBYTE(768));
1170 outb(com->esp_port + ESP_CMD2, HIBYTE(512));
1171 outb(com->esp_port + ESP_CMD2, LOBYTE(512));
1173 #endif /* COM_ESP */
1174 sio_setreg(com, com_fifo, 0);
1177 #ifdef COM_MULTIPORT
1178 if (COM_ISMULTIPORT(flags)) {
1181 com->multiport = TRUE;
1182 kprintf(" (multiport");
1183 if (unit == COM_MPMASTER(flags))
1186 masterdev = devclass_get_device(sio_devclass,
1187 COM_MPMASTER(flags));
1188 com->no_irq = (masterdev == NULL || bus_get_resource(masterdev,
1189 SYS_RES_IRQ, 0, NULL, NULL) != 0);
1191 #endif /* COM_MULTIPORT */
1192 if (unit == comconsole)
1193 kprintf(", console");
1194 if (COM_IIR_TXRDYBUG(flags))
1195 kprintf(" with a bogus IIR_TXRDY register");
1198 if (!sio_registered) {
1199 register_swi(SWI_TTY, siopoll, NULL ,"swi_siopoll", NULL);
1200 sio_registered = TRUE;
1202 minorbase = UNIT_TO_MINOR(unit);
1203 make_dev(&sio_ops, minorbase,
1204 UID_ROOT, GID_WHEEL, 0600, "ttyd%r", unit);
1205 make_dev(&sio_ops, minorbase | CONTROL_INIT_STATE,
1206 UID_ROOT, GID_WHEEL, 0600, "ttyid%r", unit);
1207 make_dev(&sio_ops, minorbase | CONTROL_LOCK_STATE,
1208 UID_ROOT, GID_WHEEL, 0600, "ttyld%r", unit);
1209 make_dev(&sio_ops, minorbase | CALLOUT_MASK,
1210 UID_UUCP, GID_DIALER, 0660, "cuaa%r", unit);
1211 make_dev(&sio_ops, minorbase | CALLOUT_MASK | CONTROL_INIT_STATE,
1212 UID_UUCP, GID_DIALER, 0660, "cuaia%r", unit);
1213 make_dev(&sio_ops, minorbase | CALLOUT_MASK | CONTROL_LOCK_STATE,
1214 UID_UUCP, GID_DIALER, 0660, "cuala%r", unit);
1216 com->pps.ppscap = PPS_CAPTUREASSERT | PPS_CAPTURECLEAR;
1217 pps_init(&com->pps);
1220 com->irqres = bus_alloc_resource(dev, SYS_RES_IRQ, &rid, 0ul, ~0ul, 1,
1223 ret = BUS_SETUP_INTR(device_get_parent(dev), dev,
1224 com->irqres, INTR_MPSAFE, siointr, com,
1225 &com->cookie, NULL);
1227 device_printf(dev, "could not activate interrupt\n");
1228 #if defined(DDB) && (defined(BREAK_TO_DEBUGGER) || \
1229 defined(ALT_BREAK_TO_DEBUGGER))
1231 * Enable interrupts for early break-to-debugger support
1234 if (ret == 0 && unit == comconsole)
1235 outb(siocniobase + com_ier, IER_ERXRDY | IER_ERLS |
1240 lwkt_reltoken(&tty_token);
1245 sioopen(struct dev_open_args *ap)
1247 cdev_t dev = ap->a_head.a_dev;
1255 unit = MINOR_TO_UNIT(mynor);
1256 com = com_addr(unit);
1261 if (mynor & CONTROL_MASK)
1263 lwkt_gettoken(&tty_token);
1264 tp = dev->si_tty = com->tp = ttymalloc(com->tp);
1267 * We jump to this label after all non-interrupted sleeps to pick
1268 * up any changes of the device state.
1271 while (com->state & CS_DTR_OFF) {
1272 error = tsleep(&com->dtr_wait, PCATCH, "siodtr", 0);
1273 if (com_addr(unit) == NULL) {
1275 lwkt_reltoken(&tty_token);
1278 if (error != 0 || com->gone)
1281 if (tp->t_state & TS_ISOPEN) {
1283 * The device is open, so everything has been initialized.
1286 if (mynor & CALLOUT_MASK) {
1287 if (!com->active_out) {
1292 if (com->active_out) {
1293 if (ap->a_oflags & O_NONBLOCK) {
1297 error = tsleep(&com->active_out,
1298 PCATCH, "siobi", 0);
1299 if (com_addr(unit) == NULL) {
1301 lwkt_reltoken(&tty_token);
1304 if (error != 0 || com->gone)
1309 if (tp->t_state & TS_XCLUDE && priv_check_cred(ap->a_cred, PRIV_ROOT, 0)) {
1315 * The device isn't open, so there are no conflicts.
1316 * Initialize it. Initialization is done twice in many
1317 * cases: to preempt sleeping callin opens if we are
1318 * callout, and to complete a callin open after DCD rises.
1320 tp->t_oproc = comstart;
1321 tp->t_param = comparam;
1322 tp->t_stop = comstop;
1324 tp->t_termios = mynor & CALLOUT_MASK
1325 ? com->it_out : com->it_in;
1326 (void)commctl(com, TIOCM_DTR | TIOCM_RTS, DMSET);
1327 com->poll = com->no_irq;
1328 com->poll_output = com->loses_outints;
1330 error = comparam(tp, &tp->t_termios);
1335 * XXX we should goto open_top if comparam() slept.
1339 * (Re)enable and drain fifos.
1341 * Certain SMC chips cause problems if the fifos
1342 * are enabled while input is ready. Turn off the
1343 * fifo if necessary to clear the input. We test
1344 * the input ready bit after enabling the fifos
1345 * since we've already enabled them in comparam()
1346 * and to handle races between enabling and fresh
1350 sio_setreg(com, com_fifo,
1351 FIFO_RCV_RST | FIFO_XMT_RST
1354 * XXX the delays are for superstitious
1355 * historical reasons. It must be less than
1356 * the character time at the maximum
1357 * supported speed (87 usec at 115200 bps
1358 * 8N1). Otherwise we might loop endlessly
1359 * if data is streaming in. We used to use
1360 * delays of 100. That usually worked
1361 * because DELAY(100) used to usually delay
1362 * for about 85 usec instead of 100.
1365 if (!(inb(com->line_status_port) & LSR_RXRDY))
1367 sio_setreg(com, com_fifo, 0);
1369 (void) inb(com->data_port);
1374 (void) inb(com->line_status_port);
1375 (void) inb(com->data_port);
1376 com->prev_modem_status = com->last_modem_status
1377 = inb(com->modem_status_port);
1378 if (COM_IIR_TXRDYBUG(com->flags)) {
1379 outb(com->intr_ctl_port, IER_ERXRDY | IER_ERLS
1382 outb(com->intr_ctl_port, IER_ERXRDY | IER_ETXRDY
1383 | IER_ERLS | IER_EMSC);
1387 * Handle initial DCD. Callout devices get a fake initial
1388 * DCD (trapdoor DCD). If we are callout, then any sleeping
1389 * callin opens get woken up and resume sleeping on "siobi"
1390 * instead of "siodcd".
1393 * XXX `mynor & CALLOUT_MASK' should be
1394 * `tp->t_cflag & (SOFT_CARRIER | TRAPDOOR_CARRIER) where
1395 * TRAPDOOR_CARRIER is the default initial state for callout
1396 * devices and SOFT_CARRIER is like CLOCAL except it hides
1399 if (com->prev_modem_status & MSR_DCD || mynor & CALLOUT_MASK)
1400 (*linesw[tp->t_line].l_modem)(tp, 1);
1403 * Wait for DCD if necessary.
1405 if (!(tp->t_state & TS_CARR_ON) && !(mynor & CALLOUT_MASK)
1406 && !(tp->t_cflag & CLOCAL) && !(ap->a_oflags & O_NONBLOCK)) {
1408 error = tsleep(TSA_CARR_ON(tp), PCATCH, "siodcd", 0);
1409 if (com_addr(unit) == NULL) {
1411 lwkt_reltoken(&tty_token);
1415 if (error != 0 || com->gone)
1419 error = (*linesw[tp->t_line].l_open)(dev, tp);
1420 disc_optim(tp, &tp->t_termios, com);
1421 if (tp->t_state & TS_ISOPEN && mynor & CALLOUT_MASK)
1422 com->active_out = TRUE;
1426 if (!(tp->t_state & TS_ISOPEN) && com->wopeners == 0)
1428 lwkt_reltoken(&tty_token);
1433 sioclose(struct dev_close_args *ap)
1435 cdev_t dev = ap->a_head.a_dev;
1441 if (mynor & CONTROL_MASK)
1443 lwkt_gettoken(&tty_token);
1444 com = com_addr(MINOR_TO_UNIT(mynor));
1446 lwkt_reltoken(&tty_token);
1451 (*linesw[tp->t_line].l_close)(tp, ap->a_fflag);
1452 disc_optim(tp, &tp->t_termios, com);
1453 comstop(tp, FREAD | FWRITE);
1459 kprintf("sio%d: gone\n", com->unit);
1461 if (com->ibuf != NULL)
1462 kfree(com->ibuf, M_DEVBUF);
1463 bzero(tp, sizeof *tp);
1466 lwkt_reltoken(&tty_token);
1471 comhardclose(struct com_s *com)
1478 lwkt_gettoken(&tty_token);
1480 com->poll_output = FALSE;
1481 com->do_timestamp = FALSE;
1482 com->do_dcd_timestamp = FALSE;
1483 com->pps.ppsparam.mode = 0;
1484 sio_setreg(com, com_cfcr, com->cfcr_image &= ~CFCR_SBREAK);
1487 #if defined(DDB) && (defined(BREAK_TO_DEBUGGER) || \
1488 defined(ALT_BREAK_TO_DEBUGGER))
1490 * Leave interrupts enabled and don't clear DTR if this is the
1491 * console. This allows us to detect break-to-debugger events
1492 * while the console device is closed.
1494 if (com->unit != comconsole)
1497 sio_setreg(com, com_ier, 0);
1498 if (tp->t_cflag & HUPCL
1500 * XXX we will miss any carrier drop between here and the
1501 * next open. Perhaps we should watch DCD even when the
1502 * port is closed; it is not sufficient to check it at
1503 * the next open because it might go up and down while
1504 * we're not watching.
1506 || (!com->active_out
1507 && !(com->prev_modem_status & MSR_DCD)
1508 && !(com->it_in.c_cflag & CLOCAL))
1509 || !(tp->t_state & TS_ISOPEN)) {
1510 (void)commctl(com, TIOCM_DTR, DMBIC);
1511 if (com->dtr_wait != 0 && !(com->state & CS_DTR_OFF)) {
1512 callout_reset(&com->dtr_ch, com->dtr_wait,
1514 com->state |= CS_DTR_OFF;
1520 * Disable fifos so that they are off after controlled
1521 * reboots. Some BIOSes fail to detect 16550s when the
1522 * fifos are enabled.
1524 sio_setreg(com, com_fifo, 0);
1526 com->active_out = FALSE;
1527 wakeup(&com->active_out);
1528 wakeup(TSA_CARR_ON(tp)); /* restart any wopeners */
1529 lwkt_reltoken(&tty_token);
1534 sioread(struct dev_read_args *ap)
1536 cdev_t dev = ap->a_head.a_dev;
1540 lwkt_gettoken(&tty_token);
1542 if (mynor & CONTROL_MASK) {
1543 lwkt_reltoken(&tty_token);
1546 com = com_addr(MINOR_TO_UNIT(mynor));
1547 if (com == NULL || com->gone) {
1548 lwkt_reltoken(&tty_token);
1551 ret = ((*linesw[com->tp->t_line].l_read)(com->tp, ap->a_uio, ap->a_ioflag));
1552 lwkt_reltoken(&tty_token);
1557 siowrite(struct dev_write_args *ap)
1559 cdev_t dev = ap->a_head.a_dev;
1564 lwkt_gettoken(&tty_token);
1566 if (mynor & CONTROL_MASK) {
1567 lwkt_reltoken(&tty_token);
1571 unit = MINOR_TO_UNIT(mynor);
1572 com = com_addr(unit);
1573 if (com == NULL || com->gone) {
1574 lwkt_reltoken(&tty_token);
1578 * (XXX) We disallow virtual consoles if the physical console is
1579 * a serial port. This is in case there is a display attached that
1580 * is not the console. In that situation we don't need/want the X
1581 * server taking over the console.
1583 if (constty != NULL && unit == comconsole)
1585 ret = ((*linesw[com->tp->t_line].l_write)(com->tp, ap->a_uio, ap->a_ioflag));
1586 lwkt_reltoken(&tty_token);
1591 siobusycheck(void *chan)
1595 lwkt_gettoken(&tty_token);
1596 com = (struct com_s *)chan;
1599 * Clear TS_BUSY if low-level output is complete.
1600 * spl locking is sufficient because siointr1() does not set CS_BUSY.
1601 * If siointr1() clears CS_BUSY after we look at it, then we'll get
1602 * called again. Reading the line status port outside of siointr1()
1603 * is safe because CS_BUSY is clear so there are no output interrupts
1607 if (com->state & CS_BUSY)
1608 com->extra_state &= ~CSE_BUSYCHECK; /* False alarm. */
1609 else if ((inb(com->line_status_port) & (LSR_TSRE | LSR_TXRDY))
1610 == (LSR_TSRE | LSR_TXRDY)) {
1611 com->tp->t_state &= ~TS_BUSY;
1613 com->extra_state &= ~CSE_BUSYCHECK;
1615 callout_reset(&com->busy_ch, hz / 100, siobusycheck, com);
1618 lwkt_reltoken(&tty_token);
1622 siodivisor(u_long rclk, speed_t speed)
1628 if (speed == 0 || speed > ((speed_t)-1 - 1) / 8)
1630 divisor = (rclk / (8UL * speed) + 1) / 2;
1631 if (divisor == 0 || divisor >= 65536)
1633 actual_speed = rclk / (16UL * divisor);
1635 /* 10 times error in percent: */
1636 error = ((actual_speed - (long)speed) * 2000 / (long)speed + 1) / 2;
1638 /* 3.0% maximum error tolerance: */
1639 if (error < -30 || error > 30)
1646 siodtrwakeup(void *chan)
1650 lwkt_gettoken(&tty_token);
1651 com = (struct com_s *)chan;
1652 com->state &= ~CS_DTR_OFF;
1653 wakeup(&com->dtr_wait);
1654 lwkt_reltoken(&tty_token);
1658 * NOTE: Must be called with tty_token held
1661 sioinput(struct com_s *com)
1669 ASSERT_LWKT_TOKEN_HELD(&tty_token);
1672 if (!(tp->t_state & TS_ISOPEN) || !(tp->t_cflag & CREAD)) {
1673 com_events -= (com->iptr - com->ibuf);
1674 com->iptr = com->ibuf;
1677 if (tp->t_state & TS_CAN_BYPASS_L_RINT) {
1679 * Avoid the grotesquely inefficient lineswitch routine
1680 * (ttyinput) in "raw" mode. It usually takes about 450
1681 * instructions (that's without canonical processing or echo!).
1682 * slinput is reasonably fast (usually 40 instructions plus
1687 incc = com->iptr - buf;
1688 if (tp->t_rawq.c_cc + incc > tp->t_ihiwat
1689 && (com->state & CS_RTS_IFLOW
1690 || tp->t_iflag & IXOFF)
1691 && !(tp->t_state & TS_TBLOCK))
1693 com->delta_error_counts[CE_TTY_BUF_OVERFLOW]
1694 += b_to_q((char *)buf, incc, &tp->t_rawq);
1698 tp->t_rawcc += incc;
1700 if (tp->t_state & TS_TTSTOP
1701 && (tp->t_iflag & IXANY
1702 || tp->t_cc[VSTART] == tp->t_cc[VSTOP])) {
1703 tp->t_state &= ~TS_TTSTOP;
1704 tp->t_lflag &= ~FLUSHO;
1708 } while (buf < com->iptr);
1712 line_status = buf[com->ierroff];
1715 & (LSR_BI | LSR_FE | LSR_OE | LSR_PE)) {
1716 if (line_status & LSR_BI)
1717 recv_data |= TTY_BI;
1718 if (line_status & LSR_FE)
1719 recv_data |= TTY_FE;
1720 if (line_status & LSR_OE)
1721 recv_data |= TTY_OE;
1722 if (line_status & LSR_PE)
1723 recv_data |= TTY_PE;
1725 (*linesw[tp->t_line].l_rint)(recv_data, tp);
1727 } while (buf < com->iptr);
1729 com_events -= (com->iptr - com->ibuf);
1730 com->iptr = com->ibuf;
1733 * There is now room for another low-level buffer full of input,
1734 * so enable RTS if it is now disabled and there is room in the
1735 * high-level buffer.
1737 if ((com->state & CS_RTS_IFLOW) && !(com->mcr_image & MCR_RTS) &&
1738 !(tp->t_state & TS_TBLOCK))
1739 outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS);
1745 lwkt_gettoken(&tty_token);
1746 #ifndef COM_MULTIPORT
1748 siointr1((struct com_s *) arg);
1750 #else /* COM_MULTIPORT */
1751 bool_t possibly_more_intrs;
1756 * Loop until there is no activity on any port. This is necessary
1757 * to get an interrupt edge more than to avoid another interrupt.
1758 * If the IRQ signal is just an OR of the IRQ signals from several
1759 * devices, then the edge from one may be lost because another is
1764 possibly_more_intrs = FALSE;
1765 for (unit = 0; unit < sio_numunits; ++unit) {
1766 com = com_addr(unit);
1769 * would it work here, or be counter-productive?
1773 && (inb(com->int_id_port) & IIR_IMASK)
1776 possibly_more_intrs = TRUE;
1778 /* XXX com_unlock(); */
1780 } while (possibly_more_intrs);
1782 #endif /* COM_MULTIPORT */
1783 lwkt_reltoken(&tty_token);
1787 siointr1(struct com_s *com)
1790 u_char modem_status;
1797 lwkt_gettoken(&tty_token);
1798 int_ctl = inb(com->intr_ctl_port);
1799 int_ctl_new = int_ctl;
1801 while (!com->gone) {
1802 if (com->pps.ppsparam.mode & PPS_CAPTUREBOTH) {
1803 modem_status = inb(com->modem_status_port);
1804 if ((modem_status ^ com->last_modem_status) & MSR_DCD) {
1805 count = sys_cputimer->count();
1806 pps_event(&com->pps, count,
1807 (modem_status & MSR_DCD) ?
1808 PPS_CAPTUREASSERT : PPS_CAPTURECLEAR);
1811 line_status = inb(com->line_status_port);
1813 /* input event? (check first to help avoid overruns) */
1814 while (line_status & LSR_RCV_MASK) {
1815 /* break/unnattached error bits or real input? */
1816 if (!(line_status & LSR_RXRDY))
1819 recv_data = inb(com->data_port);
1820 #if defined(DDB) && defined(ALT_BREAK_TO_DEBUGGER)
1822 * Solaris implements a new BREAK which is initiated
1823 * by a character sequence CR ~ ^b which is similar
1824 * to a familiar pattern used on Sun servers by the
1827 #define KEY_CRTLB 2 /* ^B */
1828 #define KEY_CR 13 /* CR '\r' */
1829 #define KEY_TILDE 126 /* ~ */
1831 if (com->unit == comconsole) {
1832 static int brk_state1 = 0, brk_state2 = 0;
1833 if (recv_data == KEY_CR) {
1834 brk_state1 = recv_data;
1836 } else if (brk_state1 == KEY_CR && (recv_data == KEY_TILDE || recv_data == KEY_CRTLB)) {
1837 if (recv_data == KEY_TILDE)
1838 brk_state2 = recv_data;
1839 else if (brk_state2 == KEY_TILDE && recv_data == KEY_CRTLB) {
1841 brk_state1 = brk_state2 = 0;
1849 if (line_status & (LSR_BI | LSR_FE | LSR_PE)) {
1851 * Don't store BI if IGNBRK or FE/PE if IGNPAR.
1852 * Otherwise, push the work to a higher level
1853 * (to handle PARMRK) if we're bypassing.
1854 * Otherwise, convert BI/FE and PE+INPCK to 0.
1856 * This makes bypassing work right in the
1857 * usual "raw" case (IGNBRK set, and IGNPAR
1860 * Note: BI together with FE/PE means just BI.
1862 if (line_status & LSR_BI) {
1863 #if defined(DDB) && defined(BREAK_TO_DEBUGGER)
1864 if (com->unit == comconsole) {
1870 || com->tp->t_iflag & IGNBRK)
1874 || com->tp->t_iflag & IGNPAR)
1877 if (com->tp->t_state & TS_CAN_BYPASS_L_RINT
1878 && (line_status & (LSR_BI | LSR_FE)
1879 || com->tp->t_iflag & INPCK))
1883 if (com->hotchar != 0 && recv_data == com->hotchar)
1886 if (ioptr >= com->ibufend)
1887 CE_RECORD(com, CE_INTERRUPT_BUF_OVERFLOW);
1889 if (com->do_timestamp)
1890 microtime(&com->timestamp);
1893 #if 0 /* for testing input latency vs efficiency */
1894 if (com->iptr - com->ibuf == 8)
1897 ioptr[0] = recv_data;
1898 ioptr[com->ierroff] = line_status;
1899 com->iptr = ++ioptr;
1900 if (ioptr == com->ihighwater
1901 && com->state & CS_RTS_IFLOW)
1902 outb(com->modem_ctl_port,
1903 com->mcr_image &= ~MCR_RTS);
1904 if (line_status & LSR_OE)
1905 CE_RECORD(com, CE_OVERRUN);
1909 * "& 0x7F" is to avoid the gcc-1.40 generating a slow
1910 * jump from the top of the loop to here
1912 line_status = inb(com->line_status_port) & 0x7F;
1915 /* modem status change? (always check before doing output) */
1916 modem_status = inb(com->modem_status_port);
1917 if (modem_status != com->last_modem_status) {
1918 if (com->do_dcd_timestamp
1919 && !(com->last_modem_status & MSR_DCD)
1920 && modem_status & MSR_DCD)
1921 microtime(&com->dcd_timestamp);
1924 * Schedule high level to handle DCD changes. Note
1925 * that we don't use the delta bits anywhere. Some
1926 * UARTs mess them up, and it's easy to remember the
1927 * previous bits and calculate the delta.
1929 com->last_modem_status = modem_status;
1930 if (!(com->state & CS_CHECKMSR)) {
1931 com_events += LOTS_OF_EVENTS;
1932 com->state |= CS_CHECKMSR;
1936 /* handle CTS change immediately for crisp flow ctl */
1937 if (com->state & CS_CTS_OFLOW) {
1938 if (modem_status & MSR_CTS)
1939 com->state |= CS_ODEVREADY;
1941 com->state &= ~CS_ODEVREADY;
1945 /* output queued and everything ready? */
1946 if (line_status & LSR_TXRDY
1947 && com->state >= (CS_BUSY | CS_TTGO | CS_ODEVREADY)) {
1948 ioptr = com->obufq.l_head;
1949 if (com->tx_fifo_size > 1) {
1952 ocount = com->obufq.l_tail - ioptr;
1953 if (ocount > com->tx_fifo_size)
1954 ocount = com->tx_fifo_size;
1955 com->bytes_out += ocount;
1957 outb(com->data_port, *ioptr++);
1958 while (--ocount != 0);
1960 outb(com->data_port, *ioptr++);
1963 com->obufq.l_head = ioptr;
1964 if (COM_IIR_TXRDYBUG(com->flags)) {
1965 int_ctl_new = int_ctl | IER_ETXRDY;
1967 if (ioptr >= com->obufq.l_tail) {
1970 qp = com->obufq.l_next;
1971 qp->l_queued = FALSE;
1974 com->obufq.l_head = qp->l_head;
1975 com->obufq.l_tail = qp->l_tail;
1976 com->obufq.l_next = qp;
1978 /* output just completed */
1979 if (COM_IIR_TXRDYBUG(com->flags)) {
1980 int_ctl_new = int_ctl & ~IER_ETXRDY;
1982 com->state &= ~CS_BUSY;
1984 if (!(com->state & CS_ODONE)) {
1985 com_events += LOTS_OF_EVENTS;
1986 com->state |= CS_ODONE;
1987 setsofttty(); /* handle at high level ASAP */
1990 if (COM_IIR_TXRDYBUG(com->flags) && (int_ctl != int_ctl_new)) {
1991 outb(com->intr_ctl_port, int_ctl_new);
1996 #ifndef COM_MULTIPORT
1997 if ((inb(com->int_id_port) & IIR_IMASK) == IIR_NOPEND)
1998 #endif /* COM_MULTIPORT */
2000 lwkt_reltoken(&tty_token);
2004 lwkt_reltoken(&tty_token);
2008 sioioctl(struct dev_ioctl_args *ap)
2010 cdev_t dev = ap->a_head.a_dev;
2011 caddr_t data = ap->a_data;
2016 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
2018 struct termios term;
2020 lwkt_gettoken(&tty_token);
2023 com = com_addr(MINOR_TO_UNIT(mynor));
2024 if (com == NULL || com->gone) {
2025 lwkt_reltoken(&tty_token);
2028 if (mynor & CONTROL_MASK) {
2031 switch (mynor & CONTROL_MASK) {
2032 case CONTROL_INIT_STATE:
2033 ct = mynor & CALLOUT_MASK ? &com->it_out : &com->it_in;
2035 case CONTROL_LOCK_STATE:
2036 ct = mynor & CALLOUT_MASK ? &com->lt_out : &com->lt_in;
2039 lwkt_reltoken(&tty_token);
2040 return (ENODEV); /* /dev/nodev */
2042 switch (ap->a_cmd) {
2044 error = priv_check_cred(ap->a_cred, PRIV_ROOT, 0);
2047 *ct = *(struct termios *)data;
2048 lwkt_reltoken(&tty_token);
2051 *(struct termios *)data = *ct;
2052 lwkt_reltoken(&tty_token);
2055 *(int *)data = TTYDISC;
2056 lwkt_reltoken(&tty_token);
2059 bzero(data, sizeof(struct winsize));
2060 lwkt_reltoken(&tty_token);
2063 lwkt_reltoken(&tty_token);
2068 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
2069 term = tp->t_termios;
2071 error = ttsetcompat(tp, &ap->a_cmd, data, &term);
2073 lwkt_reltoken(&tty_token);
2076 if (ap->a_cmd != oldcmd)
2077 data = (caddr_t)&term;
2079 if (ap->a_cmd == TIOCSETA || ap->a_cmd == TIOCSETAW ||
2080 ap->a_cmd == TIOCSETAF) {
2082 struct termios *dt = (struct termios *)data;
2083 struct termios *lt = mynor & CALLOUT_MASK
2084 ? &com->lt_out : &com->lt_in;
2086 dt->c_iflag = (tp->t_iflag & lt->c_iflag)
2087 | (dt->c_iflag & ~lt->c_iflag);
2088 dt->c_oflag = (tp->t_oflag & lt->c_oflag)
2089 | (dt->c_oflag & ~lt->c_oflag);
2090 dt->c_cflag = (tp->t_cflag & lt->c_cflag)
2091 | (dt->c_cflag & ~lt->c_cflag);
2092 dt->c_lflag = (tp->t_lflag & lt->c_lflag)
2093 | (dt->c_lflag & ~lt->c_lflag);
2094 for (cc = 0; cc < NCCS; ++cc)
2095 if (lt->c_cc[cc] != 0)
2096 dt->c_cc[cc] = tp->t_cc[cc];
2097 if (lt->c_ispeed != 0)
2098 dt->c_ispeed = tp->t_ispeed;
2099 if (lt->c_ospeed != 0)
2100 dt->c_ospeed = tp->t_ospeed;
2102 error = (*linesw[tp->t_line].l_ioctl)(tp, ap->a_cmd, data, ap->a_fflag, ap->a_cred);
2103 if (error != ENOIOCTL) {
2104 lwkt_reltoken(&tty_token);
2108 error = ttioctl(tp, ap->a_cmd, data, ap->a_fflag);
2109 disc_optim(tp, &tp->t_termios, com);
2110 if (error != ENOIOCTL) {
2112 lwkt_reltoken(&tty_token);
2115 switch (ap->a_cmd) {
2117 sio_setreg(com, com_cfcr, com->cfcr_image |= CFCR_SBREAK);
2120 sio_setreg(com, com_cfcr, com->cfcr_image &= ~CFCR_SBREAK);
2123 (void)commctl(com, TIOCM_DTR, DMBIS);
2126 (void)commctl(com, TIOCM_DTR, DMBIC);
2129 * XXX should disallow changing MCR_RTS if CS_RTS_IFLOW is set. The
2130 * changes get undone on the next call to comparam().
2133 (void)commctl(com, *(int *)data, DMSET);
2136 (void)commctl(com, *(int *)data, DMBIS);
2139 (void)commctl(com, *(int *)data, DMBIC);
2142 *(int *)data = commctl(com, 0, DMGET);
2145 /* must be root since the wait applies to following logins */
2146 error = priv_check_cred(ap->a_cred, PRIV_ROOT, 0);
2149 lwkt_reltoken(&tty_token);
2152 com->dtr_wait = *(int *)data * hz / 100;
2155 *(int *)data = com->dtr_wait * 100 / hz;
2158 com->do_timestamp = TRUE;
2159 *(struct timeval *)data = com->timestamp;
2161 case TIOCDCDTIMESTAMP:
2162 com->do_dcd_timestamp = TRUE;
2163 *(struct timeval *)data = com->dcd_timestamp;
2167 error = pps_ioctl(ap->a_cmd, data, &com->pps);
2168 if (error == ENODEV)
2170 lwkt_reltoken(&tty_token);
2174 lwkt_reltoken(&tty_token);
2179 siopoll(void *dummy, void *frame)
2183 lwkt_gettoken(&tty_token);
2184 if (com_events == 0) {
2185 lwkt_reltoken(&tty_token);
2190 for (unit = 0; unit < sio_numunits; ++unit) {
2195 com = com_addr(unit);
2199 if (tp == NULL || com->gone) {
2201 * Discard any events related to never-opened or
2202 * going-away devices.
2205 incc = com->iptr - com->ibuf;
2206 com->iptr = com->ibuf;
2207 if (com->state & CS_CHECKMSR) {
2208 incc += LOTS_OF_EVENTS;
2209 com->state &= ~CS_CHECKMSR;
2215 if (com->iptr != com->ibuf) {
2220 if (com->state & CS_CHECKMSR) {
2221 u_char delta_modem_status;
2224 delta_modem_status = com->last_modem_status
2225 ^ com->prev_modem_status;
2226 com->prev_modem_status = com->last_modem_status;
2227 com_events -= LOTS_OF_EVENTS;
2228 com->state &= ~CS_CHECKMSR;
2230 if (delta_modem_status & MSR_DCD)
2231 (*linesw[tp->t_line].l_modem)
2232 (tp, com->prev_modem_status & MSR_DCD);
2234 if (com->state & CS_ODONE) {
2236 com_events -= LOTS_OF_EVENTS;
2237 com->state &= ~CS_ODONE;
2239 if (!(com->state & CS_BUSY)
2240 && !(com->extra_state & CSE_BUSYCHECK)) {
2241 callout_reset(&com->busy_ch, hz / 100,
2243 com->extra_state |= CSE_BUSYCHECK;
2245 (*linesw[tp->t_line].l_start)(tp);
2247 if (com_events == 0)
2250 if (com_events >= LOTS_OF_EVENTS)
2252 lwkt_reltoken(&tty_token);
2256 comparam(struct tty *tp, struct termios *t)
2266 lwkt_gettoken(&tty_token);
2267 unit = DEV_TO_UNIT(tp->t_dev);
2268 com = com_addr(unit);
2270 lwkt_reltoken(&tty_token);
2274 /* do historical conversions */
2275 if (t->c_ispeed == 0)
2276 t->c_ispeed = t->c_ospeed;
2278 /* check requested parameters */
2279 if (t->c_ospeed == 0)
2282 if (t->c_ispeed != t->c_ospeed) {
2283 lwkt_reltoken(&tty_token);
2286 divisor = siodivisor(com->rclk, t->c_ispeed);
2288 lwkt_reltoken(&tty_token);
2293 /* parameters are OK, convert them to the com struct and the device */
2296 (void)commctl(com, TIOCM_DTR, DMBIC); /* hang up line */
2298 (void)commctl(com, TIOCM_DTR, DMBIS);
2300 switch (cflag & CSIZE) {
2314 if (cflag & PARENB) {
2316 if (!(cflag & PARODD))
2322 if (com->hasfifo && divisor != 0) {
2324 * Use a fifo trigger level low enough so that the input
2325 * latency from the fifo is less than about 16 msec and
2326 * the total latency is less than about 30 msec. These
2327 * latencies are reasonable for humans. Serial comms
2328 * protocols shouldn't expect anything better since modem
2329 * latencies are larger.
2331 * Interrupts can be held up for long periods of time
2332 * due to inefficiencies in other parts of the kernel,
2333 * certain video cards, etc. Setting the FIFO trigger
2334 * point to MEDH instead of HIGH gives us 694uS of slop
2335 * (8 character times) instead of 173uS (2 character times)
2338 com->fifo_image = t->c_ospeed <= 4800
2339 ? FIFO_ENABLE : FIFO_ENABLE | FIFO_RX_MEDH;
2342 * The Hayes ESP card needs the fifo DMA mode bit set
2343 * in compatibility mode. If not, it will interrupt
2344 * for each character received.
2347 com->fifo_image |= FIFO_DMA_MODE;
2349 sio_setreg(com, com_fifo, com->fifo_image);
2353 * This returns with interrupts disabled so that we can complete
2354 * the speed change atomically. Keeping interrupts disabled is
2355 * especially important while com_data is hidden.
2357 (void) siosetwater(com, t->c_ispeed);
2360 sio_setreg(com, com_cfcr, cfcr | CFCR_DLAB);
2362 * Only set the divisor registers if they would change,
2363 * since on some 16550 incompatibles (UMC8669F), setting
2364 * them while input is arriving them loses sync until
2365 * data stops arriving.
2367 dlbl = divisor & 0xFF;
2368 if (sio_getreg(com, com_dlbl) != dlbl)
2369 sio_setreg(com, com_dlbl, dlbl);
2370 dlbh = divisor >> 8;
2371 if (sio_getreg(com, com_dlbh) != dlbh)
2372 sio_setreg(com, com_dlbh, dlbh);
2375 sio_setreg(com, com_cfcr, com->cfcr_image = cfcr);
2377 if (!(tp->t_state & TS_TTSTOP))
2378 com->state |= CS_TTGO;
2380 if (cflag & CRTS_IFLOW) {
2381 if (com->st16650a) {
2382 sio_setreg(com, com_cfcr, 0xbf);
2383 sio_setreg(com, com_fifo,
2384 sio_getreg(com, com_fifo) | 0x40);
2386 com->state |= CS_RTS_IFLOW;
2388 * If CS_RTS_IFLOW just changed from off to on, the change
2389 * needs to be propagated to MCR_RTS. This isn't urgent,
2390 * so do it later by calling comstart() instead of repeating
2391 * a lot of code from comstart() here.
2393 } else if (com->state & CS_RTS_IFLOW) {
2394 com->state &= ~CS_RTS_IFLOW;
2396 * CS_RTS_IFLOW just changed from on to off. Force MCR_RTS
2397 * on here, since comstart() won't do it later.
2399 outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS);
2400 if (com->st16650a) {
2401 sio_setreg(com, com_cfcr, 0xbf);
2402 sio_setreg(com, com_fifo,
2403 sio_getreg(com, com_fifo) & ~0x40);
2409 * Set up state to handle output flow control.
2410 * XXX - worth handling MDMBUF (DCD) flow control at the lowest level?
2411 * Now has 10+ msec latency, while CTS flow has 50- usec latency.
2413 com->state |= CS_ODEVREADY;
2414 com->state &= ~CS_CTS_OFLOW;
2415 if (cflag & CCTS_OFLOW) {
2416 com->state |= CS_CTS_OFLOW;
2417 if (!(com->last_modem_status & MSR_CTS))
2418 com->state &= ~CS_ODEVREADY;
2419 if (com->st16650a) {
2420 sio_setreg(com, com_cfcr, 0xbf);
2421 sio_setreg(com, com_fifo,
2422 sio_getreg(com, com_fifo) | 0x80);
2425 if (com->st16650a) {
2426 sio_setreg(com, com_cfcr, 0xbf);
2427 sio_setreg(com, com_fifo,
2428 sio_getreg(com, com_fifo) & ~0x80);
2432 sio_setreg(com, com_cfcr, com->cfcr_image);
2434 /* XXX shouldn't call functions while intrs are disabled. */
2435 disc_optim(tp, t, com);
2437 * Recover from fiddling with CS_TTGO. We used to call siointr1()
2438 * unconditionally, but that defeated the careful discarding of
2439 * stale input in sioopen().
2441 if (com->state >= (CS_BUSY | CS_TTGO))
2447 if (com->ibufold != NULL) {
2448 kfree(com->ibufold, M_DEVBUF);
2449 com->ibufold = NULL;
2451 lwkt_reltoken(&tty_token);
2456 siosetwater(struct com_s *com, speed_t speed)
2463 lwkt_gettoken(&tty_token);
2465 * Make the buffer size large enough to handle a softtty interrupt
2466 * latency of about 2 ticks without loss of throughput or data
2467 * (about 3 ticks if input flow control is not used or not honoured,
2468 * but a bit less for CS5-CS7 modes).
2470 cp4ticks = speed / 10 / hz * 4;
2471 for (ibufsize = 128; ibufsize < cp4ticks;)
2473 if (ibufsize == com->ibufsize) {
2475 lwkt_reltoken(&tty_token);
2480 * Allocate input buffer. The extra factor of 2 in the size is
2481 * to allow for an error byte for each input byte.
2483 ibuf = kmalloc(2 * ibufsize, M_DEVBUF, M_WAITOK | M_ZERO);
2485 /* Initialize non-critical variables. */
2486 com->ibufold = com->ibuf;
2487 com->ibufsize = ibufsize;
2490 tp->t_ififosize = 2 * ibufsize;
2491 tp->t_ispeedwat = (speed_t)-1;
2492 tp->t_ospeedwat = (speed_t)-1;
2496 * Read current input buffer, if any. Continue with interrupts
2500 if (com->iptr != com->ibuf)
2504 * Initialize critical variables, including input buffer watermarks.
2505 * The external device is asked to stop sending when the buffer
2506 * exactly reaches high water, or when the high level requests it.
2507 * The high level is notified immediately (rather than at a later
2508 * clock tick) when this watermark is reached.
2509 * The buffer size is chosen so the watermark should almost never
2511 * The low watermark is invisibly 0 since the buffer is always
2512 * emptied all at once.
2514 com->iptr = com->ibuf = ibuf;
2515 com->ibufend = ibuf + ibufsize;
2516 com->ierroff = ibufsize;
2517 com->ihighwater = ibuf + 3 * ibufsize / 4;
2518 lwkt_reltoken(&tty_token);
2523 comstart(struct tty *tp)
2528 lwkt_gettoken(&tty_token);
2529 unit = DEV_TO_UNIT(tp->t_dev);
2530 com = com_addr(unit);
2532 lwkt_reltoken(&tty_token);
2537 if (tp->t_state & TS_TTSTOP)
2538 com->state &= ~CS_TTGO;
2540 com->state |= CS_TTGO;
2541 if (tp->t_state & TS_TBLOCK) {
2542 if (com->mcr_image & MCR_RTS && com->state & CS_RTS_IFLOW)
2543 outb(com->modem_ctl_port, com->mcr_image &= ~MCR_RTS);
2545 if (!(com->mcr_image & MCR_RTS) && com->iptr < com->ihighwater
2546 && com->state & CS_RTS_IFLOW)
2547 outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS);
2550 if (tp->t_state & (TS_TIMEOUT | TS_TTSTOP)) {
2553 lwkt_reltoken(&tty_token);
2556 if (tp->t_outq.c_cc != 0) {
2560 if (!com->obufs[0].l_queued) {
2561 com->obufs[0].l_tail
2562 = com->obuf1 + q_to_b(&tp->t_outq, com->obuf1,
2564 com->obufs[0].l_next = NULL;
2565 com->obufs[0].l_queued = TRUE;
2567 if (com->state & CS_BUSY) {
2568 qp = com->obufq.l_next;
2569 while ((next = qp->l_next) != NULL)
2571 qp->l_next = &com->obufs[0];
2573 com->obufq.l_head = com->obufs[0].l_head;
2574 com->obufq.l_tail = com->obufs[0].l_tail;
2575 com->obufq.l_next = &com->obufs[0];
2576 com->state |= CS_BUSY;
2580 if (tp->t_outq.c_cc != 0 && !com->obufs[1].l_queued) {
2581 com->obufs[1].l_tail
2582 = com->obuf2 + q_to_b(&tp->t_outq, com->obuf2,
2584 com->obufs[1].l_next = NULL;
2585 com->obufs[1].l_queued = TRUE;
2587 if (com->state & CS_BUSY) {
2588 qp = com->obufq.l_next;
2589 while ((next = qp->l_next) != NULL)
2591 qp->l_next = &com->obufs[1];
2593 com->obufq.l_head = com->obufs[1].l_head;
2594 com->obufq.l_tail = com->obufs[1].l_tail;
2595 com->obufq.l_next = &com->obufs[1];
2596 com->state |= CS_BUSY;
2600 tp->t_state |= TS_BUSY;
2603 if (com->state >= (CS_BUSY | CS_TTGO))
2604 siointr1(com); /* fake interrupt to start output */
2608 lwkt_reltoken(&tty_token);
2612 comstop(struct tty *tp, int rw)
2616 lwkt_gettoken(&tty_token);
2617 com = com_addr(DEV_TO_UNIT(tp->t_dev));
2618 if (com == NULL || com->gone) {
2619 lwkt_reltoken(&tty_token);
2626 /* XXX avoid h/w bug. */
2629 sio_setreg(com, com_fifo,
2630 FIFO_XMT_RST | com->fifo_image);
2631 com->obufs[0].l_queued = FALSE;
2632 com->obufs[1].l_queued = FALSE;
2633 if (com->state & CS_ODONE)
2634 com_events -= LOTS_OF_EVENTS;
2635 com->state &= ~(CS_ODONE | CS_BUSY);
2636 com->tp->t_state &= ~TS_BUSY;
2641 /* XXX avoid h/w bug. */
2644 sio_setreg(com, com_fifo,
2645 FIFO_RCV_RST | com->fifo_image);
2646 com_events -= (com->iptr - com->ibuf);
2647 com->iptr = com->ibuf;
2651 lwkt_reltoken(&tty_token);
2655 commctl(struct com_s *com, int bits, int how)
2660 lwkt_gettoken(&tty_token);
2662 bits = TIOCM_LE; /* XXX - always enabled while open */
2663 mcr = com->mcr_image;
2668 msr = com->prev_modem_status;
2676 * XXX - MSR_RI is naturally volatile, and we make MSR_TERI
2677 * more volatile by reading the modem status a lot. Perhaps
2678 * we should latch both bits until the status is read here.
2680 if (msr & (MSR_RI | MSR_TERI))
2682 lwkt_reltoken(&tty_token);
2686 if (bits & TIOCM_DTR)
2688 if (bits & TIOCM_RTS)
2691 lwkt_reltoken(&tty_token);
2697 outb(com->modem_ctl_port,
2698 com->mcr_image = mcr | (com->mcr_image & MCR_IENABLE));
2701 outb(com->modem_ctl_port, com->mcr_image |= mcr);
2704 outb(com->modem_ctl_port, com->mcr_image &= ~mcr);
2708 lwkt_reltoken(&tty_token);
2713 * NOTE: Must be called with tty_token held
2722 ASSERT_LWKT_TOKEN_HELD(&tty_token);
2724 * Set our timeout period to 1 second if no polled devices are open.
2725 * Otherwise set it to max(1/200, 1/hz).
2726 * Enable timeouts iff some device is open.
2728 callout_stop(&sio_timeout_handle);
2731 for (unit = 0; unit < sio_numunits; ++unit) {
2732 com = com_addr(unit);
2733 if (com != NULL && com->tp != NULL
2734 && com->tp->t_state & TS_ISOPEN && !com->gone) {
2736 if (com->poll || com->poll_output) {
2737 sio_timeout = hz > 200 ? hz / 200 : 1;
2743 sio_timeouts_until_log = hz / sio_timeout;
2744 callout_reset(&sio_timeout_handle, sio_timeout,
2747 /* Flush error messages, if any. */
2748 sio_timeouts_until_log = 1;
2750 callout_stop(&sio_timeout_handle);
2755 * NOTE: Must be called with tty_token held
2758 comwakeup(void *chan)
2764 * Can be called from a callout too so just get the token
2766 lwkt_gettoken(&tty_token);
2767 callout_reset(&sio_timeout_handle, sio_timeout, comwakeup, NULL);
2770 * Recover from lost output interrupts.
2771 * Poll any lines that don't use interrupts.
2773 for (unit = 0; unit < sio_numunits; ++unit) {
2774 com = com_addr(unit);
2775 if (com != NULL && !com->gone
2776 && (com->state >= (CS_BUSY | CS_TTGO) || com->poll)) {
2784 * Check for and log errors, but not too often.
2786 if (--sio_timeouts_until_log > 0) {
2787 lwkt_reltoken(&tty_token);
2790 sio_timeouts_until_log = hz / sio_timeout;
2791 for (unit = 0; unit < sio_numunits; ++unit) {
2794 com = com_addr(unit);
2799 for (errnum = 0; errnum < CE_NTYPES; ++errnum) {
2804 delta = com->delta_error_counts[errnum];
2805 com->delta_error_counts[errnum] = 0;
2809 total = com->error_counts[errnum] += delta;
2810 log(LOG_ERR, "sio%d: %u more %s%s (total %lu)\n",
2811 unit, delta, error_desc[errnum],
2812 delta == 1 ? "" : "s", total);
2815 lwkt_reltoken(&tty_token);
2819 disc_optim(struct tty *tp, struct termios *t, struct com_s *com)
2821 lwkt_gettoken(&tty_token);
2822 if (!(t->c_iflag & (ICRNL | IGNCR | IMAXBEL | INLCR | ISTRIP | IXON))
2823 && (!(t->c_iflag & BRKINT) || (t->c_iflag & IGNBRK))
2824 && (!(t->c_iflag & PARMRK)
2825 || (t->c_iflag & (IGNPAR | IGNBRK)) == (IGNPAR | IGNBRK))
2826 && !(t->c_lflag & (ECHO | ICANON | IEXTEN | ISIG | PENDIN))
2827 && linesw[tp->t_line].l_rint == ttyinput)
2828 tp->t_state |= TS_CAN_BYPASS_L_RINT;
2830 tp->t_state &= ~TS_CAN_BYPASS_L_RINT;
2831 com->hotchar = linesw[tp->t_line].l_hotchar;
2832 lwkt_reltoken(&tty_token);
2836 * Following are all routines needed for SIO to act as console
2838 #include <sys/cons.h>
2848 static speed_t siocngetspeed (Port_t, u_long rclk);
2849 static void siocnclose (struct siocnstate *sp, Port_t iobase);
2850 static void siocnopen (struct siocnstate *sp, Port_t iobase, int speed);
2851 static void siocntxwait (Port_t iobase);
2853 static cn_probe_t siocnprobe;
2854 static cn_init_t siocninit;
2855 static cn_init_fini_t siocninit_fini;
2856 static cn_checkc_t siocncheckc;
2857 static cn_getc_t siocngetc;
2858 static cn_putc_t siocnputc;
2860 #if defined(__i386__) || defined(__x86_64__)
2861 CONS_DRIVER(sio, siocnprobe, siocninit, siocninit_fini,
2862 NULL, siocngetc, siocncheckc, siocnputc, NULL);
2865 /* To get the GDB related variables */
2867 #include <ddb/ddb.h>
2871 * NOTE: Must be called with tty_token held
2874 siocntxwait(Port_t iobase)
2878 ASSERT_LWKT_TOKEN_HELD(&tty_token);
2880 * Wait for any pending transmission to finish. Required to avoid
2881 * the UART lockup bug when the speed is changed, and for normal
2885 while ((inb(iobase + com_lsr) & (LSR_TSRE | LSR_TXRDY))
2886 != (LSR_TSRE | LSR_TXRDY) && --timo != 0)
2891 * Read the serial port specified and try to figure out what speed
2892 * it's currently running at. We're assuming the serial port has
2893 * been initialized and is basicly idle. This routine is only intended
2894 * to be run at system startup.
2896 * If the value read from the serial port doesn't make sense, return 0.
2899 * NOTE: Must be called with tty_token held
2902 siocngetspeed(Port_t iobase, u_long rclk)
2909 ASSERT_LWKT_TOKEN_HELD(&tty_token);
2910 cfcr = inb(iobase + com_cfcr);
2911 outb(iobase + com_cfcr, CFCR_DLAB | cfcr);
2913 dlbl = inb(iobase + com_dlbl);
2914 dlbh = inb(iobase + com_dlbh);
2916 outb(iobase + com_cfcr, cfcr);
2918 divisor = dlbh << 8 | dlbl;
2920 /* XXX there should be more sanity checking. */
2923 return (rclk / (16UL * divisor));
2927 siocnopen(struct siocnstate *sp, Port_t iobase, int speed)
2933 lwkt_gettoken(&tty_token);
2935 * Save all the device control registers except the fifo register
2936 * and set our default ones (cs8 -parenb speed=comdefaultrate).
2937 * We can't save the fifo register since it is read-only.
2939 sp->ier = inb(iobase + com_ier);
2940 outb(iobase + com_ier, 0); /* spltty() doesn't stop siointr() */
2941 siocntxwait(iobase);
2942 sp->cfcr = inb(iobase + com_cfcr);
2943 outb(iobase + com_cfcr, CFCR_DLAB | CFCR_8BITS);
2944 sp->dlbl = inb(iobase + com_dlbl);
2945 sp->dlbh = inb(iobase + com_dlbh);
2947 * Only set the divisor registers if they would change, since on
2948 * some 16550 incompatibles (Startech), setting them clears the
2949 * data input register. This also reduces the effects of the
2952 divisor = siodivisor(comdefaultrclk, speed);
2953 dlbl = divisor & 0xFF;
2954 if (sp->dlbl != dlbl)
2955 outb(iobase + com_dlbl, dlbl);
2956 dlbh = divisor >> 8;
2957 if (sp->dlbh != dlbh)
2958 outb(iobase + com_dlbh, dlbh);
2959 outb(iobase + com_cfcr, CFCR_8BITS);
2960 sp->mcr = inb(iobase + com_mcr);
2962 * We don't want interrupts, but must be careful not to "disable"
2963 * them by clearing the MCR_IENABLE bit, since that might cause
2964 * an interrupt by floating the IRQ line.
2966 outb(iobase + com_mcr, (sp->mcr & MCR_IENABLE) | MCR_DTR | MCR_RTS);
2967 lwkt_reltoken(&tty_token);
2971 siocnclose(struct siocnstate *sp, Port_t iobase)
2973 lwkt_gettoken(&tty_token);
2975 * Restore the device control registers.
2977 siocntxwait(iobase);
2978 outb(iobase + com_cfcr, CFCR_DLAB | CFCR_8BITS);
2979 if (sp->dlbl != inb(iobase + com_dlbl))
2980 outb(iobase + com_dlbl, sp->dlbl);
2981 if (sp->dlbh != inb(iobase + com_dlbh))
2982 outb(iobase + com_dlbh, sp->dlbh);
2983 outb(iobase + com_cfcr, sp->cfcr);
2985 * XXX damp oscillations of MCR_DTR and MCR_RTS by not restoring them.
2987 outb(iobase + com_mcr, sp->mcr | MCR_DTR | MCR_RTS);
2988 outb(iobase + com_ier, sp->ier);
2989 lwkt_reltoken(&tty_token);
2993 siocnprobe(struct consdev *cp)
2999 struct siocnstate sp;
3002 * Find our first enabled console, if any. If it is a high-level
3003 * console device, then initialize it and return successfully.
3004 * If it is a low-level console device, then initialize it and
3005 * return unsuccessfully. It must be initialized in both cases
3006 * for early use by console drivers and debuggers. Initializing
3007 * the hardware is not necessary in all cases, since the i/o
3008 * routines initialize it on the fly, but it is necessary if
3009 * input might arrive while the hardware is switched back to an
3010 * uninitialized state. We can't handle multiple console devices
3011 * yet because our low-level routines don't take a device arg.
3012 * We trust the user to set the console flags properly so that we
3013 * don't need to probe.
3015 cp->cn_pri = CN_DEAD;
3017 lwkt_gettoken(&tty_token);
3018 for (unit = 0; unit < 16; unit++) { /* XXX need to know how many */
3021 if (resource_int_value("sio", unit, "disabled", &disabled) == 0) {
3025 if (resource_int_value("sio", unit, "flags", &flags))
3027 if (COM_CONSOLE(flags) || COM_DEBUGGER(flags)) {
3031 if (resource_int_value("sio", unit, "port", &port))
3035 if (boothowto & RB_SERIAL) {
3037 siocngetspeed(iobase, comdefaultrclk);
3039 comdefaultrate = boot_speed;
3043 * Initialize the divisor latch. We can't rely on
3044 * siocnopen() to do this the first time, since it
3045 * avoids writing to the latch if the latch appears
3046 * to have the correct value. Also, if we didn't
3047 * just read the speed from the hardware, then we
3048 * need to set the speed in hardware so that
3049 * switching it later is null.
3051 cfcr = inb(iobase + com_cfcr);
3052 outb(iobase + com_cfcr, CFCR_DLAB | cfcr);
3053 divisor = siodivisor(comdefaultrclk, comdefaultrate);
3054 outb(iobase + com_dlbl, divisor & 0xff);
3055 outb(iobase + com_dlbh, divisor >> 8);
3056 outb(iobase + com_cfcr, cfcr);
3058 siocnopen(&sp, iobase, comdefaultrate);
3061 if (COM_CONSOLE(flags) && !COM_LLCONSOLE(flags)) {
3062 cp->cn_probegood = 1;
3063 cp->cn_private = (void *)(intptr_t)unit;
3064 cp->cn_pri = COM_FORCECONSOLE(flags)
3065 || boothowto & RB_SERIAL
3066 ? CN_REMOTE : CN_NORMAL;
3067 siocniobase = iobase;
3070 if (COM_DEBUGGER(flags) && gdb_tab == NULL) {
3071 kprintf("sio%d: gdb debugging port\n", unit);
3072 siogdbiobase = iobase;
3075 cp->cn_gdbprivate = (void *)(intptr_t)unit;
3081 #if defined(__i386__) || defined(__x86_64__)
3084 * XXX Ugly Compatability.
3085 * If no gdb port has been specified, set it to be the console
3086 * as some configuration files don't specify the gdb port.
3088 if (gdb_tab == NULL && (boothowto & RB_GDB)) {
3089 kprintf("Warning: no GDB port specified. Defaulting to sio%d.\n",
3091 kprintf("Set flag 0x80 on desired GDB port in your\n");
3092 kprintf("configuration file (currently sio only).\n");
3093 siogdbiobase = siocniobase;
3094 siogdbunit = siocnunit;
3095 cp->cn_gdbprivate = (void *)(intptr_t)siocnunit;
3100 lwkt_reltoken(&tty_token);
3104 siocninit(struct consdev *cp)
3106 comconsole = (int)(intptr_t)cp->cn_private;
3110 siocninit_fini(struct consdev *cp)
3115 if (cp->cn_probegood) {
3116 unit = (int)(intptr_t)cp->cn_private;
3118 * Call devfs_find_device_by_name on ttydX to find the correct device,
3119 * as it should have been created already at this point by the
3121 * If it isn't found, the serial port was not attached at all and we
3122 * shouldn't be here, so assert this case.
3124 dev = devfs_find_device_by_name("ttyd%r", unit);
3126 KKASSERT(dev != NULL);
3132 siocncheckc(void *private)
3135 int unit = (int)(intptr_t)private;
3137 struct siocnstate sp;
3139 lwkt_gettoken(&tty_token);
3140 if (unit == siogdbunit)
3141 iobase = siogdbiobase;
3143 iobase = siocniobase;
3145 siocnopen(&sp, iobase, comdefaultrate);
3146 if (inb(iobase + com_lsr) & LSR_RXRDY)
3147 c = inb(iobase + com_data);
3150 siocnclose(&sp, iobase);
3152 lwkt_reltoken(&tty_token);
3158 siocngetc(void *private)
3161 int unit = (int)(intptr_t)private;
3163 struct siocnstate sp;
3165 lwkt_gettoken(&tty_token);
3166 if (unit == siogdbunit)
3167 iobase = siogdbiobase;
3169 iobase = siocniobase;
3171 siocnopen(&sp, iobase, comdefaultrate);
3172 while (!(inb(iobase + com_lsr) & LSR_RXRDY))
3174 c = inb(iobase + com_data);
3175 siocnclose(&sp, iobase);
3177 lwkt_reltoken(&tty_token);
3182 siocnputc(void *private, int c)
3184 int unit = (int)(intptr_t)private;
3185 struct siocnstate sp;
3188 lwkt_gettoken(&tty_token);
3189 if (unit == siogdbunit)
3190 iobase = siogdbiobase;
3192 iobase = siocniobase;
3194 siocnopen(&sp, iobase, comdefaultrate);
3195 siocntxwait(iobase);
3196 outb(iobase + com_data, c);
3197 siocnclose(&sp, iobase);
3199 lwkt_reltoken(&tty_token);
3202 DRIVER_MODULE(sio, isa, sio_isa_driver, sio_devclass, 0, 0);
3203 DRIVER_MODULE(sio, acpi, sio_isa_driver, sio_devclass, 0, 0);
3205 DRIVER_MODULE(sio, pci, sio_pci_driver, sio_devclass, 0, 0);
3208 DRIVER_MODULE(sio, puc, sio_puc_driver, sio_devclass, 0, 0);