2 * Copyright (c) 1991 The Regents of the University of California.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * $FreeBSD: src/sys/isa/sio.c,v 1.291.2.35 2003/05/18 08:51:15 murray Exp $
34 * $DragonFly: src/sys/dev/serial/sio/sio.c,v 1.22 2005/02/01 22:41:23 dillon Exp $
35 * from: @(#)com.c 7.5 (Berkeley) 5/16/91
36 * from: i386/isa sio.c,v 1.234
39 #include "opt_comconsole.h"
40 #include "opt_compat.h"
50 * Serial driver, based on 386BSD-0.1 com driver.
51 * Mostly rewritten to use pseudo-DMA.
52 * Works for National Semiconductor NS8250-NS16550AF UARTs.
53 * COM driver, based on HP dca driver.
55 * Changes for PC-Card integration:
56 * - Added PC-Card driver table and handlers
58 #include <sys/param.h>
59 #include <sys/systm.h>
60 #include <sys/reboot.h>
61 #include <sys/malloc.h>
64 #include <sys/module.h>
66 #include <sys/dkstat.h>
67 #include <sys/fcntl.h>
68 #include <sys/interrupt.h>
69 #include <sys/kernel.h>
70 #include <sys/syslog.h>
71 #include <sys/sysctl.h>
73 #include <machine/bus_pio.h>
74 #include <machine/bus.h>
76 #include <sys/timepps.h>
78 #include <machine/limits.h>
80 #include <bus/isa/isareg.h>
81 #include <bus/isa/isavar.h>
83 #include <bus/pci/pcireg.h>
84 #include <bus/pci/pcivar.h>
87 #include <dev/misc/puc/pucvar.h>
89 #include <machine/lock.h>
91 #include <machine/clock.h>
92 #include <machine/ipl.h>
94 #include <machine/lock.h>
96 #include <machine/resource.h>
99 #include "sio_private.h"
102 #include "../ic_layer/esp.h"
105 #define LOTS_OF_EVENTS 64 /* helps separate urgent events from input */
107 #define CALLOUT_MASK 0x80
108 #define CONTROL_MASK 0x60
109 #define CONTROL_INIT_STATE 0x20
110 #define CONTROL_LOCK_STATE 0x40
111 #define DEV_TO_UNIT(dev) (MINOR_TO_UNIT(minor(dev)))
112 #define MINOR_TO_UNIT(mynor) ((((mynor) & ~0xffffU) >> (8 + 3)) \
114 #define UNIT_TO_MINOR(unit) ((((unit) & ~0x1fU) << (8 + 3)) \
117 #define com_scr 7 /* scratch register for 16450-16550 (R/W) */
119 #define sio_getreg(com, off) \
120 (bus_space_read_1((com)->bst, (com)->bsh, (off)))
121 #define sio_setreg(com, off, value) \
122 (bus_space_write_1((com)->bst, (com)->bsh, (off), (value)))
126 * (CS_BUSY | CS_TTGO) and (CS_BUSY | CS_TTGO | CS_ODEVREADY) must be higher
127 * than the other bits so that they can be tested as a group without masking
130 * The following com and tty flags correspond closely:
131 * CS_BUSY = TS_BUSY (maintained by comstart(), siopoll() and
133 * CS_TTGO = ~TS_TTSTOP (maintained by comparam() and comstart())
134 * CS_CTS_OFLOW = CCTS_OFLOW (maintained by comparam())
135 * CS_RTS_IFLOW = CRTS_IFLOW (maintained by comparam())
136 * TS_FLUSH is not used.
137 * XXX I think TIOCSETA doesn't clear TS_TTSTOP when it clears IXON.
138 * XXX CS_*FLOW should be CF_*FLOW in com->flags (control flags not state).
140 #define CS_BUSY 0x80 /* output in progress */
141 #define CS_TTGO 0x40 /* output not stopped by XOFF */
142 #define CS_ODEVREADY 0x20 /* external device h/w ready (CTS) */
143 #define CS_CHECKMSR 1 /* check of MSR scheduled */
144 #define CS_CTS_OFLOW 2 /* use CTS output flow control */
145 #define CS_DTR_OFF 0x10 /* DTR held off */
146 #define CS_ODONE 4 /* output completed */
147 #define CS_RTS_IFLOW 8 /* use RTS input flow control */
148 #define CSE_BUSYCHECK 1 /* siobusycheck() scheduled */
150 static char const * const error_desc[] = {
153 #define CE_INTERRUPT_BUF_OVERFLOW 1
154 "interrupt-level buffer overflow",
155 #define CE_TTY_BUF_OVERFLOW 2
156 "tty-level buffer overflow",
160 static int espattach (struct com_s *com, Port_t esp_port);
162 static int sio_isa_attach (device_t dev);
164 static timeout_t siobusycheck;
165 static u_int siodivisor (u_long rclk, speed_t speed);
166 static timeout_t siodtrwakeup;
167 static void comhardclose (struct com_s *com);
168 static void sioinput (struct com_s *com);
169 static void siointr1 (struct com_s *com);
170 static void siointr (void *arg);
171 static int commctl (struct com_s *com, int bits, int how);
172 static int comparam (struct tty *tp, struct termios *t);
173 static inthand2_t siopoll;
174 static int sio_isa_probe (device_t dev);
175 static void siosettimeout (void);
176 static int siosetwater (struct com_s *com, speed_t speed);
177 static void comstart (struct tty *tp);
178 static void comstop (struct tty *tp, int rw);
179 static timeout_t comwakeup;
180 static void disc_optim (struct tty *tp, struct termios *t,
184 static int sio_pci_attach (device_t dev);
185 static void sio_pci_kludge_unit (device_t dev);
186 static int sio_pci_probe (device_t dev);
187 #endif /* NPCI > 0 */
190 static int sio_puc_attach (device_t dev);
191 static int sio_puc_probe (device_t dev);
192 #endif /* NPUC > 0 */
194 static char driver_name[] = "sio";
196 /* table and macro for fast conversion from a unit number to its com struct */
197 devclass_t sio_devclass;
198 #define com_addr(unit) ((struct com_s *) \
199 devclass_get_softc(sio_devclass, unit))
201 static device_method_t sio_isa_methods[] = {
202 /* Device interface */
203 DEVMETHOD(device_probe, sio_isa_probe),
204 DEVMETHOD(device_attach, sio_isa_attach),
209 static driver_t sio_isa_driver = {
212 sizeof(struct com_s),
216 static device_method_t sio_pci_methods[] = {
217 /* Device interface */
218 DEVMETHOD(device_probe, sio_pci_probe),
219 DEVMETHOD(device_attach, sio_pci_attach),
224 static driver_t sio_pci_driver = {
227 sizeof(struct com_s),
229 #endif /* NPCI > 0 */
232 static device_method_t sio_puc_methods[] = {
233 /* Device interface */
234 DEVMETHOD(device_probe, sio_puc_probe),
235 DEVMETHOD(device_attach, sio_puc_attach),
240 static driver_t sio_puc_driver = {
243 sizeof(struct com_s),
245 #endif /* NPUC > 0 */
247 static d_open_t sioopen;
248 static d_close_t sioclose;
249 static d_read_t sioread;
250 static d_write_t siowrite;
251 static d_ioctl_t sioioctl;
253 #define CDEV_MAJOR 28
254 static struct cdevsw sio_cdevsw = {
255 /* name */ driver_name,
256 /* maj */ CDEV_MAJOR,
257 /* flags */ D_TTY | D_KQFILTER,
262 /* close */ sioclose,
264 /* write */ siowrite,
265 /* ioctl */ sioioctl,
268 /* strategy */ nostrategy,
271 /* kqfilter */ ttykqfilter
275 static volatile speed_t comdefaultrate = CONSPEED;
276 static u_long comdefaultrclk = DEFAULT_RCLK;
277 SYSCTL_ULONG(_machdep, OID_AUTO, conrclk, CTLFLAG_RW, &comdefaultrclk, 0, "");
279 static volatile speed_t gdbdefaultrate = CONSPEED;
281 static u_int com_events; /* input chars + weighted output completions */
282 static Port_t siocniobase;
283 static int siocnunit;
284 static Port_t siogdbiobase;
285 static int siogdbunit = -1;
286 static bool_t sio_registered;
287 static int sio_timeout;
288 static int sio_timeouts_until_log;
289 static struct callout sio_timeout_handle;
290 static int sio_numunits;
293 /* XXX configure this properly. */
294 static Port_t likely_com_ports[] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8, };
295 static Port_t likely_esp_ports[] = { 0x140, 0x180, 0x280, 0 };
299 * handle sysctl read/write requests for console speed
301 * In addition to setting comdefaultrate for I/O through /dev/console,
302 * also set the initial and lock values for the /dev/ttyXX device
303 * if there is one associated with the console. Finally, if the /dev/tty
304 * device has already been open, change the speed on the open running port
309 sysctl_machdep_comdefaultrate(SYSCTL_HANDLER_ARGS)
316 newspeed = comdefaultrate;
318 error = sysctl_handle_opaque(oidp, &newspeed, sizeof newspeed, req);
319 if (error || !req->newptr)
322 comdefaultrate = newspeed;
324 if (comconsole < 0) /* serial console not selected? */
327 com = com_addr(comconsole);
332 * set the initial and lock rates for /dev/ttydXX and /dev/cuaXX
333 * (note, the lock rates really are boolean -- if non-zero, disallow
336 com->it_in.c_ispeed = com->it_in.c_ospeed =
337 com->lt_in.c_ispeed = com->lt_in.c_ospeed =
338 com->it_out.c_ispeed = com->it_out.c_ospeed =
339 com->lt_out.c_ispeed = com->lt_out.c_ospeed = comdefaultrate;
342 * if we're open, change the running rate too
345 if (tp && (tp->t_state & TS_ISOPEN)) {
346 tp->t_termios.c_ispeed =
347 tp->t_termios.c_ospeed = comdefaultrate;
349 error = comparam(tp, &tp->t_termios);
355 SYSCTL_PROC(_machdep, OID_AUTO, conspeed, CTLTYPE_INT | CTLFLAG_RW,
356 0, 0, sysctl_machdep_comdefaultrate, "I", "");
365 static struct pci_ids pci_ids[] = {
366 { 0x100812b9, "3COM PCI FaxModem", 0x10 },
367 { 0x2000131f, "CyberSerial (1-port) 16550", 0x10 },
368 { 0x01101407, "Koutech IOFLEX-2S PCI Dual Port Serial", 0x10 },
369 { 0x01111407, "Koutech IOFLEX-2S PCI Dual Port Serial", 0x10 },
370 { 0x048011c1, "Lucent kermit based PCI Modem", 0x14 },
371 { 0x95211415, "Oxford Semiconductor PCI Dual Port Serial", 0x10 },
372 { 0x7101135e, "SeaLevel Ultra 530.PCI Single Port Serial", 0x18 },
373 { 0x0000151f, "SmartLink 5634PCV SurfRider", 0x10 },
374 { 0x98459710, "Netmos Nm9845 PCI Bridge with Dual UART", 0x10 },
375 { 0x00000000, NULL, 0 }
385 type = pci_get_devid(dev);
387 while (id->type && id->type != type)
389 if (id->desc == NULL)
391 sio_pci_kludge_unit(dev);
392 return (sioattach(dev, id->rid, 0UL));
396 * Don't cut and paste this to other drivers. It is a horrible kludge
397 * which will fail to work and also be unnecessary in future versions.
400 sio_pci_kludge_unit(dev)
410 while (resource_int_value("sio", unit, "port", &start) == 0 &&
413 if (device_get_unit(dev) < unit) {
414 dc = device_get_devclass(dev);
415 while (devclass_get_device(dc, unit))
417 device_printf(dev, "moving to sio%d\n", unit);
418 err = device_set_unit(dev, unit); /* EVIL DO NOT COPY */
420 device_printf(dev, "error moving device %d\n", err);
431 type = pci_get_devid(dev);
433 while (id->type && id->type != type)
435 if (id->desc == NULL)
437 device_set_desc(dev, id->desc);
438 return (sioprobe(dev, id->rid, 0UL));
440 #endif /* NPCI > 0 */
449 if (BUS_READ_IVAR(device_get_parent(dev), dev, PUC_IVAR_FREQ,
452 return (sioattach(dev, 0, rclk));
461 if (BUS_READ_IVAR(device_get_parent(dev), dev, PUC_IVAR_FREQ,
464 return (sioprobe(dev, 0, rclk));
468 static struct isa_pnp_id sio_ids[] = {
469 {0x0005d041, "Standard PC COM port"}, /* PNP0500 */
470 {0x0105d041, "16550A-compatible COM port"}, /* PNP0501 */
471 {0x0205d041, "Multiport serial device (non-intelligent 16550)"}, /* PNP0502 */
472 {0x1005d041, "Generic IRDA-compatible device"}, /* PNP0510 */
473 {0x1105d041, "Generic IRDA-compatible device"}, /* PNP0511 */
474 /* Devices that do not have a compatid */
475 {0x12206804, NULL}, /* ACH2012 - 5634BTS 56K Video Ready Modem */
476 {0x7602a904, NULL}, /* AEI0276 - 56K v.90 Fax Modem (LKT) */
477 {0x00007905, NULL}, /* AKY0000 - 56K Plug&Play Modem */
478 {0x21107905, NULL}, /* AKY1021 - 56K Plug&Play Modem */
479 {0x01405407, NULL}, /* AZT4001 - AZT3000 PnP SOUND DEVICE, MODEM */
480 {0x56039008, NULL}, /* BDP0356 - Best Data 56x2 */
481 {0x56159008, NULL}, /* BDP1556 - B.D. Smart One 56SPS,Voice Modem*/
482 {0x36339008, NULL}, /* BDP3336 - Best Data Prods. 336F */
483 {0x0014490a, NULL}, /* BRI1400 - Boca 33.6 PnP */
484 {0x0015490a, NULL}, /* BRI1500 - Internal Fax Data */
485 {0x0034490a, NULL}, /* BRI3400 - Internal ACF Modem */
486 {0x0094490a, NULL}, /* BRI9400 - Boca K56Flex PnP */
487 {0x00b4490a, NULL}, /* BRIB400 - Boca 56k PnP */
488 {0x0030320d, NULL}, /* CIR3000 - Cirrus Logic V43 */
489 {0x0100440e, NULL}, /* CRD0001 - Cardinal MVP288IV ? */
490 {0x01308c0e, NULL}, /* CTL3001 - Creative Labs Phoneblaster */
491 {0x36033610, NULL}, /* DAV0336 - DAVICOM 336PNP MODEM */
492 {0x01009416, NULL}, /* ETT0001 - E-Tech Bullet 33k6 PnP */
493 {0x0000aa1a, NULL}, /* FUJ0000 - FUJITSU Modem 33600 PNP/I2 */
494 {0x1200c31e, NULL}, /* GVC0012 - VF1128HV-R9 (win modem?) */
495 {0x0303c31e, NULL}, /* GVC0303 - MaxTech 33.6 PnP D/F/V */
496 {0x0505c31e, NULL}, /* GVC0505 - GVC 56k Faxmodem */
497 {0x0116c31e, NULL}, /* GVC1601 - Rockwell V.34 Plug & Play Modem */
498 {0x0050c31e, NULL}, /* GVC5000 - some GVC modem */
499 {0x3800f91e, NULL}, /* GWY0038 - Telepath with v.90 */
500 {0x9062f91e, NULL}, /* GWY6290 - Telepath with x2 Technology */
501 {0x8100e425, NULL}, /* IOD0081 - I-O DATA DEVICE,INC. IFML-560 */
502 {0x21002534, NULL}, /* MAE0021 - Jetstream Int V.90 56k Voice Series 2*/
503 {0x0000f435, NULL}, /* MOT0000 - Motorola ModemSURFR 33.6 Intern */
504 {0x5015f435, NULL}, /* MOT1550 - Motorola ModemSURFR 56K Modem */
505 {0xf015f435, NULL}, /* MOT15F0 - Motorola VoiceSURFR 56K Modem */
506 {0x6045f435, NULL}, /* MOT4560 - Motorola ? */
507 {0x61e7a338, NULL}, /* NECE761 - 33.6Modem */
508 {0x08804f3f, NULL}, /* OZO8008 - Zoom (33.6k Modem) */
509 {0x0f804f3f, NULL}, /* OZO800f - Zoom 2812 (56k Modem) */
510 {0x39804f3f, NULL}, /* OZO8039 - Zoom 56k flex */
511 {0x00914f3f, NULL}, /* OZO9100 - Zoom 2919 (K56 Faxmodem) */
512 {0x3024a341, NULL}, /* PMC2430 - Pace 56 Voice Internal Modem */
513 {0x1000eb49, NULL}, /* ROK0010 - Rockwell ? */
514 {0x1200b23d, NULL}, /* RSS0012 - OMRON ME5614ISA */
515 {0x5002734a, NULL}, /* RSS0250 - 5614Jx3(G) Internal Modem */
516 {0x6202734a, NULL}, /* RSS0262 - 5614Jx3[G] V90+K56Flex Modem */
517 {0x1010104d, NULL}, /* SHP1010 - Rockwell 33600bps Modem */
518 {0xc100ad4d, NULL}, /* SMM00C1 - Leopard 56k PnP */
519 {0x9012b04e, NULL}, /* SUP1290 - Supra ? */
520 {0x1013b04e, NULL}, /* SUP1310 - SupraExpress 336i PnP */
521 {0x8013b04e, NULL}, /* SUP1380 - SupraExpress 288i PnP Voice */
522 {0x8113b04e, NULL}, /* SUP1381 - SupraExpress 336i PnP Voice */
523 {0x5016b04e, NULL}, /* SUP1650 - Supra 336i Sp Intl */
524 {0x7016b04e, NULL}, /* SUP1670 - Supra 336i V+ Intl */
525 {0x7420b04e, NULL}, /* SUP2070 - Supra ? */
526 {0x8020b04e, NULL}, /* SUP2080 - Supra ? */
527 {0x8420b04e, NULL}, /* SUP2084 - SupraExpress 56i PnP */
528 {0x7121b04e, NULL}, /* SUP2171 - SupraExpress 56i Sp? */
529 {0x8024b04e, NULL}, /* SUP2480 - Supra ? */
530 {0x01007256, NULL}, /* USR0001 - U.S. Robotics Inc., Sportster W */
531 {0x02007256, NULL}, /* USR0002 - U.S. Robotics Inc. Sportster 33. */
532 {0x04007256, NULL}, /* USR0004 - USR Sportster 14.4k */
533 {0x06007256, NULL}, /* USR0006 - USR Sportster 33.6k */
534 {0x11007256, NULL}, /* USR0011 - USR ? */
535 {0x01017256, NULL}, /* USR0101 - USR ? */
536 {0x30207256, NULL}, /* USR2030 - U.S.Robotics Inc. Sportster 560 */
537 {0x50207256, NULL}, /* USR2050 - U.S.Robotics Inc. Sportster 33. */
538 {0x70207256, NULL}, /* USR2070 - U.S.Robotics Inc. Sportster 560 */
539 {0x30307256, NULL}, /* USR3030 - U.S. Robotics 56K FAX INT */
540 {0x31307256, NULL}, /* USR3031 - U.S. Robotics 56K FAX INT */
541 {0x50307256, NULL}, /* USR3050 - U.S. Robotics 56K FAX INT */
542 {0x70307256, NULL}, /* USR3070 - U.S. Robotics 56K Voice INT */
543 {0x90307256, NULL}, /* USR3090 - USR ? */
544 {0x70917256, NULL}, /* USR9170 - U.S. Robotics 56K FAX INT */
545 {0x90917256, NULL}, /* USR9190 - USR 56k Voice INT */
546 {0x0300695c, NULL}, /* WCI0003 - Fax/Voice/Modem/Speakphone/Asvd */
547 {0x01a0896a, NULL}, /* ZTIA001 - Zoom Internal V90 Faxmodem */
548 {0x61f7896a, NULL}, /* ZTIF761 - Zoom ComStar 33.6 */
558 /* Check isapnp ids */
559 if (ISA_PNP_PROBE(device_get_parent(dev), dev, sio_ids) == ENXIO)
561 return (sioprobe(dev, 0, 0UL));
565 sioprobe(dev, xrid, rclk)
571 static bool_t already_init;
580 intrmask_t irqmap[4];
585 u_int flags = device_get_flags(dev);
587 struct resource *port;
590 port = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid,
591 0, ~0, IO_COMSIZE, RF_ACTIVE);
595 com = device_get_softc(dev);
596 com->bst = rman_get_bustag(port);
597 com->bsh = rman_get_bushandle(port);
604 * XXX this is broken - when we are first called, there are no
605 * previously configured IO ports. We could hard code
606 * 0x3f8, 0x2f8, 0x3e8, 0x2e8 etc but that's probably worse.
607 * This code has been doing nothing since the conversion since
608 * "count" is zero the first time around.
612 * Turn off MCR_IENABLE for all likely serial ports. An unused
613 * port with its MCR_IENABLE gate open will inhibit interrupts
614 * from any used port that shares the interrupt vector.
615 * XXX the gate enable is elsewhere for some multiports.
618 int count, i, xioport;
620 devclass_get_devices(sio_devclass, &devs, &count);
621 for (i = 0; i < count; i++) {
623 if (device_is_enabled(xdev) &&
624 bus_get_resource(xdev, SYS_RES_IOPORT, 0, &xioport,
626 outb(xioport + com_mcr, 0);
633 if (COM_LLCONSOLE(flags)) {
634 printf("sio%d: reserved for low-level i/o\n",
635 device_get_unit(dev));
636 bus_release_resource(dev, SYS_RES_IOPORT, rid, port);
641 * If the device is on a multiport card and has an AST/4
642 * compatible interrupt control register, initialize this
643 * register and prepare to leave MCR_IENABLE clear in the mcr.
644 * Otherwise, prepare to set MCR_IENABLE in the mcr.
645 * Point idev to the device struct giving the correct id_irq.
646 * This is the struct for the master device if there is one.
649 mcr_image = MCR_IENABLE;
651 if (COM_ISMULTIPORT(flags)) {
655 idev = devclass_get_device(sio_devclass, COM_MPMASTER(flags));
657 printf("sio%d: master device %d not configured\n",
658 device_get_unit(dev), COM_MPMASTER(flags));
661 if (!COM_NOTAST4(flags)) {
662 if (bus_get_resource(idev, SYS_RES_IOPORT, 0, &io,
665 if (bus_get_resource(idev, SYS_RES_IRQ, 0,
667 outb(xiobase + com_scr, 0x80);
669 outb(xiobase + com_scr, 0);
674 #endif /* COM_MULTIPORT */
675 if (bus_get_resource(idev, SYS_RES_IRQ, 0, NULL, NULL) != 0)
678 bzero(failures, sizeof failures);
679 iobase = rman_get_start(port);
682 * We don't want to get actual interrupts, just masked ones.
683 * Interrupts from this line should already be masked in the ICU,
684 * but mask them in the processor as well in case there are some
685 * (misconfigured) shared interrupts.
691 * For the TI16754 chips, set prescaler to 1 (4 is often the
692 * default after-reset value) as otherwise it's impossible to
693 * get highest baudrates.
695 if (COM_TI16754(flags)) {
698 cfcr = sio_getreg(com, com_cfcr);
699 sio_setreg(com, com_cfcr, CFCR_EFR_ENABLE);
700 efr = sio_getreg(com, com_efr);
701 /* Unlock extended features to turn off prescaler. */
702 sio_setreg(com, com_efr, efr | EFR_EFE);
704 sio_setreg(com, com_cfcr, (cfcr != CFCR_EFR_ENABLE) ? cfcr : 0);
705 /* Turn off prescaler. */
706 sio_setreg(com, com_mcr,
707 sio_getreg(com, com_mcr) & ~MCR_PRESCALE);
708 sio_setreg(com, com_cfcr, CFCR_EFR_ENABLE);
709 sio_setreg(com, com_efr, efr);
710 sio_setreg(com, com_cfcr, cfcr);
714 * Initialize the speed and the word size and wait long enough to
715 * drain the maximum of 16 bytes of junk in device output queues.
716 * The speed is undefined after a master reset and must be set
717 * before relying on anything related to output. There may be
718 * junk after a (very fast) soft reboot and (apparently) after
720 * XXX what about the UART bug avoided by waiting in comparam()?
721 * We don't want to to wait long enough to drain at 2 bps.
723 if (iobase == siocniobase) {
724 DELAY((16 + 1) * 1000000 / (comdefaultrate / 10));
726 sio_setreg(com, com_cfcr, CFCR_DLAB | CFCR_8BITS);
727 divisor = siodivisor(rclk, SIO_TEST_SPEED);
728 sio_setreg(com, com_dlbl, divisor & 0xff);
729 sio_setreg(com, com_dlbh, divisor >> 8);
730 sio_setreg(com, com_cfcr, CFCR_8BITS);
731 DELAY((16 + 1) * 1000000 / (SIO_TEST_SPEED / 10));
735 * Make sure we can drain the receiver. If we can't, the serial
736 * port may not exist.
738 for (fn = 0; fn < 256; ++fn) {
739 if ((sio_getreg(com, com_lsr) & LSR_RXRDY) == 0)
741 (void)sio_getreg(com, com_data);
744 printf("sio%d: can't drain, serial port might "
745 "not exist, disabling\n", device_get_unit(dev));
751 * Enable the interrupt gate and disable device interupts. This
752 * should leave the device driving the interrupt line low and
753 * guarantee an edge trigger if an interrupt can be generated.
756 sio_setreg(com, com_mcr, mcr_image);
757 sio_setreg(com, com_ier, 0);
758 DELAY(1000); /* XXX */
759 irqmap[0] = isa_irq_pending();
762 * Attempt to set loopback mode so that we can send a null byte
763 * without annoying any external device.
766 sio_setreg(com, com_mcr, mcr_image | MCR_LOOPBACK);
769 * Attempt to generate an output interrupt. On 8250's, setting
770 * IER_ETXRDY generates an interrupt independent of the current
771 * setting and independent of whether the THR is empty. On 16450's,
772 * setting IER_ETXRDY generates an interrupt independent of the
773 * current setting. On 16550A's, setting IER_ETXRDY only
774 * generates an interrupt when IER_ETXRDY is not already set.
776 sio_setreg(com, com_ier, IER_ETXRDY);
779 * On some 16x50 incompatibles, setting IER_ETXRDY doesn't generate
780 * an interrupt. They'd better generate one for actually doing
781 * output. Loopback may be broken on the same incompatibles but
782 * it's unlikely to do more than allow the null byte out.
784 sio_setreg(com, com_data, 0);
785 DELAY((1 + 2) * 1000000 / (SIO_TEST_SPEED / 10));
788 * Turn off loopback mode so that the interrupt gate works again
789 * (MCR_IENABLE was hidden). This should leave the device driving
790 * an interrupt line high. It doesn't matter if the interrupt
791 * line oscillates while we are not looking at it, since interrupts
795 sio_setreg(com, com_mcr, mcr_image);
798 * Some pcmcia cards have the "TXRDY bug", so we check everyone
799 * for IIR_TXRDY implementation ( Palido 321s, DC-1S... )
801 if (COM_NOPROBE(flags)) {
802 /* Reading IIR register twice */
803 for (fn = 0; fn < 2; fn ++) {
805 failures[6] = sio_getreg(com, com_iir);
807 /* Check IIR_TXRDY clear ? */
809 if (failures[6] & IIR_TXRDY) {
810 /* Nop, Double check with clearing IER */
811 sio_setreg(com, com_ier, 0);
812 if (sio_getreg(com, com_iir) & IIR_NOPEND) {
813 /* Ok. we're familia this gang */
814 SET_FLAG(dev, COM_C_IIR_TXRDYBUG);
816 /* Unknown, Just omit this chip.. XXX */
818 sio_setreg(com, com_mcr, 0);
821 /* OK. this is well-known guys */
822 CLR_FLAG(dev, COM_C_IIR_TXRDYBUG);
824 sio_setreg(com, com_ier, 0);
825 sio_setreg(com, com_cfcr, CFCR_8BITS);
827 bus_release_resource(dev, SYS_RES_IOPORT, rid, port);
828 return (iobase == siocniobase ? 0 : result);
833 * o the CFCR, IER and MCR in UART hold the values written to them
834 * (the values happen to be all distinct - this is good for
835 * avoiding false positive tests from bus echoes).
836 * o an output interrupt is generated and its vector is correct.
837 * o the interrupt goes away when the IIR in the UART is read.
840 failures[0] = sio_getreg(com, com_cfcr) - CFCR_8BITS;
841 failures[1] = sio_getreg(com, com_ier) - IER_ETXRDY;
842 failures[2] = sio_getreg(com, com_mcr) - mcr_image;
843 DELAY(10000); /* Some internal modems need this time */
844 irqmap[1] = isa_irq_pending();
845 failures[4] = (sio_getreg(com, com_iir) & IIR_IMASK) - IIR_TXRDY;
846 DELAY(1000); /* XXX */
847 irqmap[2] = isa_irq_pending();
848 failures[6] = (sio_getreg(com, com_iir) & IIR_IMASK) - IIR_NOPEND;
851 * Turn off all device interrupts and check that they go off properly.
852 * Leave MCR_IENABLE alone. For ports without a master port, it gates
853 * the OUT2 output of the UART to
854 * the ICU input. Closing the gate would give a floating ICU input
855 * (unless there is another device driving it) and spurious interrupts.
856 * (On the system that this was first tested on, the input floats high
857 * and gives a (masked) interrupt as soon as the gate is closed.)
859 sio_setreg(com, com_ier, 0);
860 sio_setreg(com, com_cfcr, CFCR_8BITS); /* dummy to avoid bus echo */
861 failures[7] = sio_getreg(com, com_ier);
862 DELAY(1000); /* XXX */
863 irqmap[3] = isa_irq_pending();
864 failures[9] = (sio_getreg(com, com_iir) & IIR_IMASK) - IIR_NOPEND;
868 irqs = irqmap[1] & ~irqmap[0];
869 if (bus_get_resource(idev, SYS_RES_IRQ, 0, &xirq, NULL) == 0 &&
870 ((1 << xirq) & irqs) == 0)
872 "sio%d: configured irq %ld not in bitmap of probed irqs %#x\n",
873 device_get_unit(dev), xirq, irqs);
875 printf("sio%d: irq maps: %#x %#x %#x %#x\n",
876 device_get_unit(dev),
877 irqmap[0], irqmap[1], irqmap[2], irqmap[3]);
880 for (fn = 0; fn < sizeof failures; ++fn)
882 sio_setreg(com, com_mcr, 0);
885 printf("sio%d: probe failed test(s):",
886 device_get_unit(dev));
887 for (fn = 0; fn < sizeof failures; ++fn)
894 bus_release_resource(dev, SYS_RES_IOPORT, rid, port);
895 return (iobase == siocniobase ? 0 : result);
900 espattach(com, esp_port)
908 * Check the ESP-specific I/O port to see if we're an ESP
909 * card. If not, return failure immediately.
911 if ((inb(esp_port) & 0xf3) == 0) {
912 printf(" port 0x%x is not an ESP board?\n", esp_port);
917 * We've got something that claims to be a Hayes ESP card.
921 /* Get the dip-switch configuration */
922 outb(esp_port + ESP_CMD1, ESP_GETDIPS);
923 dips = inb(esp_port + ESP_STATUS1);
926 * Bits 0,1 of dips say which COM port we are.
928 if (rman_get_start(com->ioportres) == likely_com_ports[dips & 0x03])
931 printf(" esp_port has com %d\n", dips & 0x03);
936 * Check for ESP version 2.0 or later: bits 4,5,6 = 010.
938 outb(esp_port + ESP_CMD1, ESP_GETTEST);
939 val = inb(esp_port + ESP_STATUS1); /* clear reg 1 */
940 val = inb(esp_port + ESP_STATUS2);
941 if ((val & 0x70) < 0x20) {
942 printf("-old (%o)", val & 0x70);
947 * Check for ability to emulate 16550: bit 7 == 1
949 if ((dips & 0x80) == 0) {
955 * Okay, we seem to be a Hayes ESP card. Whee.
958 com->esp_port = esp_port;
967 return (sioattach(dev, 0, 0UL));
971 sioattach(dev, xrid, rclk)
985 struct resource *port;
991 callout_init(&sio_timeout_handle);
995 port = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid,
996 0, ~0, IO_COMSIZE, RF_ACTIVE);
1000 iobase = rman_get_start(port);
1001 unit = device_get_unit(dev);
1002 com = device_get_softc(dev);
1003 flags = device_get_flags(dev);
1005 if (unit >= sio_numunits)
1006 sio_numunits = unit + 1;
1008 * sioprobe() has initialized the device registers as follows:
1009 * o cfcr = CFCR_8BITS.
1010 * It is most important that CFCR_DLAB is off, so that the
1011 * data port is not hidden when we enable interrupts.
1013 * Interrupts are only enabled when the line is open.
1014 * o mcr = MCR_IENABLE, or 0 if the port has AST/4 compatible
1015 * interrupt control register or the config specifies no irq.
1016 * Keeping MCR_DTR and MCR_RTS off might stop the external
1017 * device from sending before we are ready.
1019 bzero(com, sizeof *com);
1021 com->ioportres = port;
1022 com->bst = rman_get_bustag(port);
1023 com->bsh = rman_get_bushandle(port);
1024 com->cfcr_image = CFCR_8BITS;
1025 com->dtr_wait = 3 * hz;
1026 callout_init(&com->dtr_ch);
1027 callout_init(&com->busy_ch);
1028 com->loses_outints = COM_LOSESOUTINTS(flags) != 0;
1029 com->no_irq = bus_get_resource(dev, SYS_RES_IRQ, 0, NULL, NULL) != 0;
1030 com->tx_fifo_size = 1;
1031 com->obufs[0].l_head = com->obuf1;
1032 com->obufs[1].l_head = com->obuf2;
1034 com->data_port = iobase + com_data;
1035 com->int_id_port = iobase + com_iir;
1036 com->modem_ctl_port = iobase + com_mcr;
1037 com->mcr_image = inb(com->modem_ctl_port);
1038 com->line_status_port = iobase + com_lsr;
1039 com->modem_status_port = iobase + com_msr;
1040 com->intr_ctl_port = iobase + com_ier;
1043 rclk = DEFAULT_RCLK;
1047 * We don't use all the flags from <sys/ttydefaults.h> since they
1048 * are only relevant for logins. It's important to have echo off
1049 * initially so that the line doesn't start blathering before the
1050 * echo flag can be turned off.
1052 com->it_in.c_iflag = 0;
1053 com->it_in.c_oflag = 0;
1054 com->it_in.c_cflag = TTYDEF_CFLAG;
1055 com->it_in.c_lflag = 0;
1056 if (unit == comconsole) {
1057 com->it_in.c_iflag = TTYDEF_IFLAG;
1058 com->it_in.c_oflag = TTYDEF_OFLAG;
1059 com->it_in.c_cflag = TTYDEF_CFLAG | CLOCAL;
1060 com->it_in.c_lflag = TTYDEF_LFLAG;
1061 com->lt_out.c_cflag = com->lt_in.c_cflag = CLOCAL;
1062 com->lt_out.c_ispeed = com->lt_out.c_ospeed =
1063 com->lt_in.c_ispeed = com->lt_in.c_ospeed =
1064 com->it_in.c_ispeed = com->it_in.c_ospeed = comdefaultrate;
1066 com->it_in.c_ispeed = com->it_in.c_ospeed = TTYDEF_SPEED;
1067 if (siosetwater(com, com->it_in.c_ispeed) != 0) {
1070 * Leave i/o resources allocated if this is a `cn'-level
1071 * console, so that other devices can't snarf them.
1073 if (iobase != siocniobase)
1074 bus_release_resource(dev, SYS_RES_IOPORT, rid, port);
1078 termioschars(&com->it_in);
1079 com->it_out = com->it_in;
1081 /* attempt to determine UART type */
1082 printf("sio%d: type", unit);
1085 #ifdef COM_MULTIPORT
1086 if (!COM_ISMULTIPORT(flags) && !COM_IIR_TXRDYBUG(flags))
1088 if (!COM_IIR_TXRDYBUG(flags))
1095 scr = sio_getreg(com, com_scr);
1096 sio_setreg(com, com_scr, 0xa5);
1097 scr1 = sio_getreg(com, com_scr);
1098 sio_setreg(com, com_scr, 0x5a);
1099 scr2 = sio_getreg(com, com_scr);
1100 sio_setreg(com, com_scr, scr);
1101 if (scr1 != 0xa5 || scr2 != 0x5a) {
1103 goto determined_type;
1106 sio_setreg(com, com_fifo, FIFO_ENABLE | FIFO_RX_HIGH);
1109 switch (inb(com->int_id_port) & IIR_FIFO_MASK) {
1120 if (COM_NOFIFO(flags)) {
1121 printf(" 16550A fifo disabled");
1123 com->hasfifo = TRUE;
1124 if (COM_ST16650A(flags)) {
1126 com->tx_fifo_size = 32;
1127 printf(" ST16650A");
1128 } else if (COM_TI16754(flags)) {
1129 com->tx_fifo_size = 64;
1132 com->tx_fifo_size = COM_FIFOSIZE(flags);
1137 for (espp = likely_esp_ports; *espp != 0; espp++)
1138 if (espattach(com, *espp)) {
1139 com->tx_fifo_size = 1024;
1143 if (!com->st16650a && !COM_TI16754(flags)) {
1144 if (!com->tx_fifo_size)
1145 com->tx_fifo_size = 16;
1147 printf(" lookalike with %d bytes FIFO",
1157 * Set 16550 compatibility mode.
1158 * We don't use the ESP_MODE_SCALE bit to increase the
1159 * fifo trigger levels because we can't handle large
1161 * XXX flow control should be set in comparam(), not here.
1163 outb(com->esp_port + ESP_CMD1, ESP_SETMODE);
1164 outb(com->esp_port + ESP_CMD2, ESP_MODE_RTS | ESP_MODE_FIFO);
1166 /* Set RTS/CTS flow control. */
1167 outb(com->esp_port + ESP_CMD1, ESP_SETFLOWTYPE);
1168 outb(com->esp_port + ESP_CMD2, ESP_FLOW_RTS);
1169 outb(com->esp_port + ESP_CMD2, ESP_FLOW_CTS);
1171 /* Set flow-control levels. */
1172 outb(com->esp_port + ESP_CMD1, ESP_SETRXFLOW);
1173 outb(com->esp_port + ESP_CMD2, HIBYTE(768));
1174 outb(com->esp_port + ESP_CMD2, LOBYTE(768));
1175 outb(com->esp_port + ESP_CMD2, HIBYTE(512));
1176 outb(com->esp_port + ESP_CMD2, LOBYTE(512));
1178 #endif /* COM_ESP */
1179 sio_setreg(com, com_fifo, 0);
1182 #ifdef COM_MULTIPORT
1183 if (COM_ISMULTIPORT(flags)) {
1186 com->multiport = TRUE;
1187 printf(" (multiport");
1188 if (unit == COM_MPMASTER(flags))
1191 masterdev = devclass_get_device(sio_devclass,
1192 COM_MPMASTER(flags));
1193 com->no_irq = (masterdev == NULL || bus_get_resource(masterdev,
1194 SYS_RES_IRQ, 0, NULL, NULL) != 0);
1196 #endif /* COM_MULTIPORT */
1197 if (unit == comconsole)
1198 printf(", console");
1199 if (COM_IIR_TXRDYBUG(flags))
1200 printf(" with a bogus IIR_TXRDY register");
1203 if (!sio_registered) {
1204 register_swi(SWI_TTY, siopoll, NULL ,"swi_siopoll", NULL);
1205 sio_registered = TRUE;
1207 minorbase = UNIT_TO_MINOR(unit);
1208 cdevsw_add(&sio_cdevsw, UNIT_TO_MINOR(-1), minorbase);
1209 make_dev(&sio_cdevsw, minorbase,
1210 UID_ROOT, GID_WHEEL, 0600, "ttyd%r", unit);
1211 make_dev(&sio_cdevsw, minorbase | CONTROL_INIT_STATE,
1212 UID_ROOT, GID_WHEEL, 0600, "ttyid%r", unit);
1213 make_dev(&sio_cdevsw, minorbase | CONTROL_LOCK_STATE,
1214 UID_ROOT, GID_WHEEL, 0600, "ttyld%r", unit);
1215 make_dev(&sio_cdevsw, minorbase | CALLOUT_MASK,
1216 UID_UUCP, GID_DIALER, 0660, "cuaa%r", unit);
1217 make_dev(&sio_cdevsw, minorbase | CALLOUT_MASK | CONTROL_INIT_STATE,
1218 UID_UUCP, GID_DIALER, 0660, "cuaia%r", unit);
1219 make_dev(&sio_cdevsw, minorbase | CALLOUT_MASK | CONTROL_LOCK_STATE,
1220 UID_UUCP, GID_DIALER, 0660, "cuala%r", unit);
1222 com->pps.ppscap = PPS_CAPTUREASSERT | PPS_CAPTURECLEAR;
1223 pps_init(&com->pps);
1226 com->irqres = bus_alloc_resource(dev, SYS_RES_IRQ, &rid, 0ul, ~0ul, 1,
1229 ret = BUS_SETUP_INTR(device_get_parent(dev), dev, com->irqres,
1230 INTR_TYPE_TTY | INTR_FAST,
1231 siointr, com, &com->cookie);
1233 ret = BUS_SETUP_INTR(device_get_parent(dev), dev,
1234 com->irqres, INTR_TYPE_TTY,
1235 siointr, com, &com->cookie);
1237 device_printf(dev, "unable to activate interrupt in fast mode - using normal mode\n");
1240 device_printf(dev, "could not activate interrupt\n");
1241 #if defined(DDB) && (defined(BREAK_TO_DEBUGGER) || \
1242 defined(ALT_BREAK_TO_DEBUGGER))
1244 * Enable interrupts for early break-to-debugger support
1247 if (ret == 0 && unit == comconsole)
1248 outb(siocniobase + com_ier, IER_ERXRDY | IER_ERLS |
1257 sioopen(dev_t dev, int flag, int mode, struct thread *td)
1267 unit = MINOR_TO_UNIT(mynor);
1268 com = com_addr(unit);
1273 if (mynor & CONTROL_MASK)
1275 tp = dev->si_tty = com->tp = ttymalloc(com->tp);
1278 * We jump to this label after all non-interrupted sleeps to pick
1279 * up any changes of the device state.
1282 while (com->state & CS_DTR_OFF) {
1283 error = tsleep(&com->dtr_wait, PCATCH, "siodtr", 0);
1284 if (com_addr(unit) == NULL)
1286 if (error != 0 || com->gone)
1289 if (tp->t_state & TS_ISOPEN) {
1291 * The device is open, so everything has been initialized.
1294 if (mynor & CALLOUT_MASK) {
1295 if (!com->active_out) {
1300 if (com->active_out) {
1301 if (flag & O_NONBLOCK) {
1305 error = tsleep(&com->active_out,
1306 PCATCH, "siobi", 0);
1307 if (com_addr(unit) == NULL)
1309 if (error != 0 || com->gone)
1314 if (tp->t_state & TS_XCLUDE && suser(td)) {
1320 * The device isn't open, so there are no conflicts.
1321 * Initialize it. Initialization is done twice in many
1322 * cases: to preempt sleeping callin opens if we are
1323 * callout, and to complete a callin open after DCD rises.
1325 tp->t_oproc = comstart;
1326 tp->t_param = comparam;
1327 tp->t_stop = comstop;
1329 tp->t_termios = mynor & CALLOUT_MASK
1330 ? com->it_out : com->it_in;
1331 (void)commctl(com, TIOCM_DTR | TIOCM_RTS, DMSET);
1332 com->poll = com->no_irq;
1333 com->poll_output = com->loses_outints;
1335 error = comparam(tp, &tp->t_termios);
1340 * XXX we should goto open_top if comparam() slept.
1344 * (Re)enable and drain fifos.
1346 * Certain SMC chips cause problems if the fifos
1347 * are enabled while input is ready. Turn off the
1348 * fifo if necessary to clear the input. We test
1349 * the input ready bit after enabling the fifos
1350 * since we've already enabled them in comparam()
1351 * and to handle races between enabling and fresh
1355 sio_setreg(com, com_fifo,
1356 FIFO_RCV_RST | FIFO_XMT_RST
1359 * XXX the delays are for superstitious
1360 * historical reasons. It must be less than
1361 * the character time at the maximum
1362 * supported speed (87 usec at 115200 bps
1363 * 8N1). Otherwise we might loop endlessly
1364 * if data is streaming in. We used to use
1365 * delays of 100. That usually worked
1366 * because DELAY(100) used to usually delay
1367 * for about 85 usec instead of 100.
1370 if (!(inb(com->line_status_port) & LSR_RXRDY))
1372 sio_setreg(com, com_fifo, 0);
1374 (void) inb(com->data_port);
1379 (void) inb(com->line_status_port);
1380 (void) inb(com->data_port);
1381 com->prev_modem_status = com->last_modem_status
1382 = inb(com->modem_status_port);
1383 if (COM_IIR_TXRDYBUG(com->flags)) {
1384 outb(com->intr_ctl_port, IER_ERXRDY | IER_ERLS
1387 outb(com->intr_ctl_port, IER_ERXRDY | IER_ETXRDY
1388 | IER_ERLS | IER_EMSC);
1392 * Handle initial DCD. Callout devices get a fake initial
1393 * DCD (trapdoor DCD). If we are callout, then any sleeping
1394 * callin opens get woken up and resume sleeping on "siobi"
1395 * instead of "siodcd".
1398 * XXX `mynor & CALLOUT_MASK' should be
1399 * `tp->t_cflag & (SOFT_CARRIER | TRAPDOOR_CARRIER) where
1400 * TRAPDOOR_CARRIER is the default initial state for callout
1401 * devices and SOFT_CARRIER is like CLOCAL except it hides
1404 if (com->prev_modem_status & MSR_DCD || mynor & CALLOUT_MASK)
1405 (*linesw[tp->t_line].l_modem)(tp, 1);
1408 * Wait for DCD if necessary.
1410 if (!(tp->t_state & TS_CARR_ON) && !(mynor & CALLOUT_MASK)
1411 && !(tp->t_cflag & CLOCAL) && !(flag & O_NONBLOCK)) {
1413 error = tsleep(TSA_CARR_ON(tp), PCATCH, "siodcd", 0);
1414 if (com_addr(unit) == NULL)
1417 if (error != 0 || com->gone)
1421 error = (*linesw[tp->t_line].l_open)(dev, tp);
1422 disc_optim(tp, &tp->t_termios, com);
1423 if (tp->t_state & TS_ISOPEN && mynor & CALLOUT_MASK)
1424 com->active_out = TRUE;
1428 if (!(tp->t_state & TS_ISOPEN) && com->wopeners == 0)
1434 sioclose(dev_t dev, int flag, int mode, struct thread *td)
1442 if (mynor & CONTROL_MASK)
1444 com = com_addr(MINOR_TO_UNIT(mynor));
1449 (*linesw[tp->t_line].l_close)(tp, flag);
1450 disc_optim(tp, &tp->t_termios, com);
1451 comstop(tp, FREAD | FWRITE);
1457 printf("sio%d: gone\n", com->unit);
1459 if (com->ibuf != NULL)
1460 free(com->ibuf, M_DEVBUF);
1461 bzero(tp, sizeof *tp);
1478 com->poll_output = FALSE;
1479 com->do_timestamp = FALSE;
1480 com->do_dcd_timestamp = FALSE;
1481 com->pps.ppsparam.mode = 0;
1482 sio_setreg(com, com_cfcr, com->cfcr_image &= ~CFCR_SBREAK);
1485 #if defined(DDB) && (defined(BREAK_TO_DEBUGGER) || \
1486 defined(ALT_BREAK_TO_DEBUGGER))
1488 * Leave interrupts enabled and don't clear DTR if this is the
1489 * console. This allows us to detect break-to-debugger events
1490 * while the console device is closed.
1492 if (com->unit != comconsole)
1495 sio_setreg(com, com_ier, 0);
1496 if (tp->t_cflag & HUPCL
1498 * XXX we will miss any carrier drop between here and the
1499 * next open. Perhaps we should watch DCD even when the
1500 * port is closed; it is not sufficient to check it at
1501 * the next open because it might go up and down while
1502 * we're not watching.
1504 || (!com->active_out
1505 && !(com->prev_modem_status & MSR_DCD)
1506 && !(com->it_in.c_cflag & CLOCAL))
1507 || !(tp->t_state & TS_ISOPEN)) {
1508 (void)commctl(com, TIOCM_DTR, DMBIC);
1509 if (com->dtr_wait != 0 && !(com->state & CS_DTR_OFF)) {
1510 callout_reset(&com->dtr_ch, com->dtr_wait,
1512 com->state |= CS_DTR_OFF;
1518 * Disable fifos so that they are off after controlled
1519 * reboots. Some BIOSes fail to detect 16550s when the
1520 * fifos are enabled.
1522 sio_setreg(com, com_fifo, 0);
1524 com->active_out = FALSE;
1525 wakeup(&com->active_out);
1526 wakeup(TSA_CARR_ON(tp)); /* restart any wopeners */
1531 sioread(dev, uio, flag)
1540 if (mynor & CONTROL_MASK)
1542 com = com_addr(MINOR_TO_UNIT(mynor));
1543 if (com == NULL || com->gone)
1545 return ((*linesw[com->tp->t_line].l_read)(com->tp, uio, flag));
1549 siowrite(dev, uio, flag)
1559 if (mynor & CONTROL_MASK)
1562 unit = MINOR_TO_UNIT(mynor);
1563 com = com_addr(unit);
1564 if (com == NULL || com->gone)
1567 * (XXX) We disallow virtual consoles if the physical console is
1568 * a serial port. This is in case there is a display attached that
1569 * is not the console. In that situation we don't need/want the X
1570 * server taking over the console.
1572 if (constty != NULL && unit == comconsole)
1574 return ((*linesw[com->tp->t_line].l_write)(com->tp, uio, flag));
1584 com = (struct com_s *)chan;
1587 * Clear TS_BUSY if low-level output is complete.
1588 * spl locking is sufficient because siointr1() does not set CS_BUSY.
1589 * If siointr1() clears CS_BUSY after we look at it, then we'll get
1590 * called again. Reading the line status port outside of siointr1()
1591 * is safe because CS_BUSY is clear so there are no output interrupts
1595 if (com->state & CS_BUSY)
1596 com->extra_state &= ~CSE_BUSYCHECK; /* False alarm. */
1597 else if ((inb(com->line_status_port) & (LSR_TSRE | LSR_TXRDY))
1598 == (LSR_TSRE | LSR_TXRDY)) {
1599 com->tp->t_state &= ~TS_BUSY;
1601 com->extra_state &= ~CSE_BUSYCHECK;
1603 callout_reset(&com->busy_ch, hz / 100, siobusycheck, com);
1609 siodivisor(rclk, speed)
1617 if (speed == 0 || speed > (ULONG_MAX - 1) / 8)
1619 divisor = (rclk / (8UL * speed) + 1) / 2;
1620 if (divisor == 0 || divisor >= 65536)
1622 actual_speed = rclk / (16UL * divisor);
1624 /* 10 times error in percent: */
1625 error = ((actual_speed - (long)speed) * 2000 / (long)speed + 1) / 2;
1627 /* 3.0% maximum error tolerance: */
1628 if (error < -30 || error > 30)
1640 com = (struct com_s *)chan;
1641 com->state &= ~CS_DTR_OFF;
1642 wakeup(&com->dtr_wait);
1657 if (!(tp->t_state & TS_ISOPEN) || !(tp->t_cflag & CREAD)) {
1658 com_events -= (com->iptr - com->ibuf);
1659 com->iptr = com->ibuf;
1662 if (tp->t_state & TS_CAN_BYPASS_L_RINT) {
1664 * Avoid the grotesquely inefficient lineswitch routine
1665 * (ttyinput) in "raw" mode. It usually takes about 450
1666 * instructions (that's without canonical processing or echo!).
1667 * slinput is reasonably fast (usually 40 instructions plus
1672 incc = com->iptr - buf;
1673 if (tp->t_rawq.c_cc + incc > tp->t_ihiwat
1674 && (com->state & CS_RTS_IFLOW
1675 || tp->t_iflag & IXOFF)
1676 && !(tp->t_state & TS_TBLOCK))
1678 com->delta_error_counts[CE_TTY_BUF_OVERFLOW]
1679 += b_to_q((char *)buf, incc, &tp->t_rawq);
1683 tp->t_rawcc += incc;
1685 if (tp->t_state & TS_TTSTOP
1686 && (tp->t_iflag & IXANY
1687 || tp->t_cc[VSTART] == tp->t_cc[VSTOP])) {
1688 tp->t_state &= ~TS_TTSTOP;
1689 tp->t_lflag &= ~FLUSHO;
1693 } while (buf < com->iptr);
1697 line_status = buf[com->ierroff];
1700 & (LSR_BI | LSR_FE | LSR_OE | LSR_PE)) {
1701 if (line_status & LSR_BI)
1702 recv_data |= TTY_BI;
1703 if (line_status & LSR_FE)
1704 recv_data |= TTY_FE;
1705 if (line_status & LSR_OE)
1706 recv_data |= TTY_OE;
1707 if (line_status & LSR_PE)
1708 recv_data |= TTY_PE;
1710 (*linesw[tp->t_line].l_rint)(recv_data, tp);
1712 } while (buf < com->iptr);
1714 com_events -= (com->iptr - com->ibuf);
1715 com->iptr = com->ibuf;
1718 * There is now room for another low-level buffer full of input,
1719 * so enable RTS if it is now disabled and there is room in the
1720 * high-level buffer.
1722 if ((com->state & CS_RTS_IFLOW) && !(com->mcr_image & MCR_RTS) &&
1723 !(tp->t_state & TS_TBLOCK))
1724 outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS);
1731 #ifndef COM_MULTIPORT
1733 siointr1((struct com_s *) arg);
1735 #else /* COM_MULTIPORT */
1736 bool_t possibly_more_intrs;
1741 * Loop until there is no activity on any port. This is necessary
1742 * to get an interrupt edge more than to avoid another interrupt.
1743 * If the IRQ signal is just an OR of the IRQ signals from several
1744 * devices, then the edge from one may be lost because another is
1749 possibly_more_intrs = FALSE;
1750 for (unit = 0; unit < sio_numunits; ++unit) {
1751 com = com_addr(unit);
1754 * would it work here, or be counter-productive?
1758 && (inb(com->int_id_port) & IIR_IMASK)
1761 possibly_more_intrs = TRUE;
1763 /* XXX com_unlock(); */
1765 } while (possibly_more_intrs);
1767 #endif /* COM_MULTIPORT */
1775 u_char modem_status;
1782 int_ctl = inb(com->intr_ctl_port);
1783 int_ctl_new = int_ctl;
1785 while (!com->gone) {
1786 if (com->pps.ppsparam.mode & PPS_CAPTUREBOTH) {
1787 modem_status = inb(com->modem_status_port);
1788 if ((modem_status ^ com->last_modem_status) & MSR_DCD) {
1789 count = cputimer_count();
1790 pps_event(&com->pps, count,
1791 (modem_status & MSR_DCD) ?
1792 PPS_CAPTUREASSERT : PPS_CAPTURECLEAR);
1795 line_status = inb(com->line_status_port);
1797 /* input event? (check first to help avoid overruns) */
1798 while (line_status & LSR_RCV_MASK) {
1799 /* break/unnattached error bits or real input? */
1800 if (!(line_status & LSR_RXRDY))
1803 recv_data = inb(com->data_port);
1804 #if defined(DDB) && defined(ALT_BREAK_TO_DEBUGGER)
1806 * Solaris implements a new BREAK which is initiated
1807 * by a character sequence CR ~ ^b which is similar
1808 * to a familiar pattern used on Sun servers by the
1811 #define KEY_CRTLB 2 /* ^B */
1812 #define KEY_CR 13 /* CR '\r' */
1813 #define KEY_TILDE 126 /* ~ */
1815 if (com->unit == comconsole) {
1816 static int brk_state1 = 0, brk_state2 = 0;
1817 if (recv_data == KEY_CR) {
1818 brk_state1 = recv_data;
1820 } else if (brk_state1 == KEY_CR && (recv_data == KEY_TILDE || recv_data == KEY_CRTLB)) {
1821 if (recv_data == KEY_TILDE)
1822 brk_state2 = recv_data;
1823 else if (brk_state2 == KEY_TILDE && recv_data == KEY_CRTLB) {
1825 brk_state1 = brk_state2 = 0;
1833 if (line_status & (LSR_BI | LSR_FE | LSR_PE)) {
1835 * Don't store BI if IGNBRK or FE/PE if IGNPAR.
1836 * Otherwise, push the work to a higher level
1837 * (to handle PARMRK) if we're bypassing.
1838 * Otherwise, convert BI/FE and PE+INPCK to 0.
1840 * This makes bypassing work right in the
1841 * usual "raw" case (IGNBRK set, and IGNPAR
1844 * Note: BI together with FE/PE means just BI.
1846 if (line_status & LSR_BI) {
1847 #if defined(DDB) && defined(BREAK_TO_DEBUGGER)
1848 if (com->unit == comconsole) {
1854 || com->tp->t_iflag & IGNBRK)
1858 || com->tp->t_iflag & IGNPAR)
1861 if (com->tp->t_state & TS_CAN_BYPASS_L_RINT
1862 && (line_status & (LSR_BI | LSR_FE)
1863 || com->tp->t_iflag & INPCK))
1867 if (com->hotchar != 0 && recv_data == com->hotchar)
1870 if (ioptr >= com->ibufend)
1871 CE_RECORD(com, CE_INTERRUPT_BUF_OVERFLOW);
1873 if (com->do_timestamp)
1874 microtime(&com->timestamp);
1877 #if 0 /* for testing input latency vs efficiency */
1878 if (com->iptr - com->ibuf == 8)
1881 ioptr[0] = recv_data;
1882 ioptr[com->ierroff] = line_status;
1883 com->iptr = ++ioptr;
1884 if (ioptr == com->ihighwater
1885 && com->state & CS_RTS_IFLOW)
1886 outb(com->modem_ctl_port,
1887 com->mcr_image &= ~MCR_RTS);
1888 if (line_status & LSR_OE)
1889 CE_RECORD(com, CE_OVERRUN);
1893 * "& 0x7F" is to avoid the gcc-1.40 generating a slow
1894 * jump from the top of the loop to here
1896 line_status = inb(com->line_status_port) & 0x7F;
1899 /* modem status change? (always check before doing output) */
1900 modem_status = inb(com->modem_status_port);
1901 if (modem_status != com->last_modem_status) {
1902 if (com->do_dcd_timestamp
1903 && !(com->last_modem_status & MSR_DCD)
1904 && modem_status & MSR_DCD)
1905 microtime(&com->dcd_timestamp);
1908 * Schedule high level to handle DCD changes. Note
1909 * that we don't use the delta bits anywhere. Some
1910 * UARTs mess them up, and it's easy to remember the
1911 * previous bits and calculate the delta.
1913 com->last_modem_status = modem_status;
1914 if (!(com->state & CS_CHECKMSR)) {
1915 com_events += LOTS_OF_EVENTS;
1916 com->state |= CS_CHECKMSR;
1920 /* handle CTS change immediately for crisp flow ctl */
1921 if (com->state & CS_CTS_OFLOW) {
1922 if (modem_status & MSR_CTS)
1923 com->state |= CS_ODEVREADY;
1925 com->state &= ~CS_ODEVREADY;
1929 /* output queued and everything ready? */
1930 if (line_status & LSR_TXRDY
1931 && com->state >= (CS_BUSY | CS_TTGO | CS_ODEVREADY)) {
1932 ioptr = com->obufq.l_head;
1933 if (com->tx_fifo_size > 1) {
1936 ocount = com->obufq.l_tail - ioptr;
1937 if (ocount > com->tx_fifo_size)
1938 ocount = com->tx_fifo_size;
1939 com->bytes_out += ocount;
1941 outb(com->data_port, *ioptr++);
1942 while (--ocount != 0);
1944 outb(com->data_port, *ioptr++);
1947 com->obufq.l_head = ioptr;
1948 if (COM_IIR_TXRDYBUG(com->flags)) {
1949 int_ctl_new = int_ctl | IER_ETXRDY;
1951 if (ioptr >= com->obufq.l_tail) {
1954 qp = com->obufq.l_next;
1955 qp->l_queued = FALSE;
1958 com->obufq.l_head = qp->l_head;
1959 com->obufq.l_tail = qp->l_tail;
1960 com->obufq.l_next = qp;
1962 /* output just completed */
1963 if (COM_IIR_TXRDYBUG(com->flags)) {
1964 int_ctl_new = int_ctl & ~IER_ETXRDY;
1966 com->state &= ~CS_BUSY;
1968 if (!(com->state & CS_ODONE)) {
1969 com_events += LOTS_OF_EVENTS;
1970 com->state |= CS_ODONE;
1971 setsofttty(); /* handle at high level ASAP */
1974 if (COM_IIR_TXRDYBUG(com->flags) && (int_ctl != int_ctl_new)) {
1975 outb(com->intr_ctl_port, int_ctl_new);
1980 #ifndef COM_MULTIPORT
1981 if ((inb(com->int_id_port) & IIR_IMASK) == IIR_NOPEND)
1982 #endif /* COM_MULTIPORT */
1988 sioioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct thread *td)
1995 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
1997 struct termios term;
2001 com = com_addr(MINOR_TO_UNIT(mynor));
2002 if (com == NULL || com->gone)
2004 if (mynor & CONTROL_MASK) {
2007 switch (mynor & CONTROL_MASK) {
2008 case CONTROL_INIT_STATE:
2009 ct = mynor & CALLOUT_MASK ? &com->it_out : &com->it_in;
2011 case CONTROL_LOCK_STATE:
2012 ct = mynor & CALLOUT_MASK ? &com->lt_out : &com->lt_in;
2015 return (ENODEV); /* /dev/nodev */
2022 *ct = *(struct termios *)data;
2025 *(struct termios *)data = *ct;
2028 *(int *)data = TTYDISC;
2031 bzero(data, sizeof(struct winsize));
2038 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
2039 term = tp->t_termios;
2041 error = ttsetcompat(tp, &cmd, data, &term);
2045 data = (caddr_t)&term;
2047 if (cmd == TIOCSETA || cmd == TIOCSETAW || cmd == TIOCSETAF) {
2049 struct termios *dt = (struct termios *)data;
2050 struct termios *lt = mynor & CALLOUT_MASK
2051 ? &com->lt_out : &com->lt_in;
2053 dt->c_iflag = (tp->t_iflag & lt->c_iflag)
2054 | (dt->c_iflag & ~lt->c_iflag);
2055 dt->c_oflag = (tp->t_oflag & lt->c_oflag)
2056 | (dt->c_oflag & ~lt->c_oflag);
2057 dt->c_cflag = (tp->t_cflag & lt->c_cflag)
2058 | (dt->c_cflag & ~lt->c_cflag);
2059 dt->c_lflag = (tp->t_lflag & lt->c_lflag)
2060 | (dt->c_lflag & ~lt->c_lflag);
2061 for (cc = 0; cc < NCCS; ++cc)
2062 if (lt->c_cc[cc] != 0)
2063 dt->c_cc[cc] = tp->t_cc[cc];
2064 if (lt->c_ispeed != 0)
2065 dt->c_ispeed = tp->t_ispeed;
2066 if (lt->c_ospeed != 0)
2067 dt->c_ospeed = tp->t_ospeed;
2069 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, td);
2070 if (error != ENOIOCTL)
2073 error = ttioctl(tp, cmd, data, flag);
2074 disc_optim(tp, &tp->t_termios, com);
2075 if (error != ENOIOCTL) {
2081 sio_setreg(com, com_cfcr, com->cfcr_image |= CFCR_SBREAK);
2084 sio_setreg(com, com_cfcr, com->cfcr_image &= ~CFCR_SBREAK);
2087 (void)commctl(com, TIOCM_DTR, DMBIS);
2090 (void)commctl(com, TIOCM_DTR, DMBIC);
2093 * XXX should disallow changing MCR_RTS if CS_RTS_IFLOW is set. The
2094 * changes get undone on the next call to comparam().
2097 (void)commctl(com, *(int *)data, DMSET);
2100 (void)commctl(com, *(int *)data, DMBIS);
2103 (void)commctl(com, *(int *)data, DMBIC);
2106 *(int *)data = commctl(com, 0, DMGET);
2109 /* must be root since the wait applies to following logins */
2115 com->dtr_wait = *(int *)data * hz / 100;
2118 *(int *)data = com->dtr_wait * 100 / hz;
2121 com->do_timestamp = TRUE;
2122 *(struct timeval *)data = com->timestamp;
2124 case TIOCDCDTIMESTAMP:
2125 com->do_dcd_timestamp = TRUE;
2126 *(struct timeval *)data = com->dcd_timestamp;
2130 error = pps_ioctl(cmd, data, &com->pps);
2131 if (error == ENODEV)
2140 siopoll(void *dummy)
2144 if (com_events == 0)
2147 for (unit = 0; unit < sio_numunits; ++unit) {
2152 com = com_addr(unit);
2156 if (tp == NULL || com->gone) {
2158 * Discard any events related to never-opened or
2159 * going-away devices.
2162 incc = com->iptr - com->ibuf;
2163 com->iptr = com->ibuf;
2164 if (com->state & CS_CHECKMSR) {
2165 incc += LOTS_OF_EVENTS;
2166 com->state &= ~CS_CHECKMSR;
2172 if (com->iptr != com->ibuf) {
2177 if (com->state & CS_CHECKMSR) {
2178 u_char delta_modem_status;
2181 delta_modem_status = com->last_modem_status
2182 ^ com->prev_modem_status;
2183 com->prev_modem_status = com->last_modem_status;
2184 com_events -= LOTS_OF_EVENTS;
2185 com->state &= ~CS_CHECKMSR;
2187 if (delta_modem_status & MSR_DCD)
2188 (*linesw[tp->t_line].l_modem)
2189 (tp, com->prev_modem_status & MSR_DCD);
2191 if (com->state & CS_ODONE) {
2193 com_events -= LOTS_OF_EVENTS;
2194 com->state &= ~CS_ODONE;
2196 if (!(com->state & CS_BUSY)
2197 && !(com->extra_state & CSE_BUSYCHECK)) {
2198 callout_reset(&com->busy_ch, hz / 100,
2200 com->extra_state |= CSE_BUSYCHECK;
2202 (*linesw[tp->t_line].l_start)(tp);
2204 if (com_events == 0)
2207 if (com_events >= LOTS_OF_EVENTS)
2225 unit = DEV_TO_UNIT(tp->t_dev);
2226 com = com_addr(unit);
2230 /* do historical conversions */
2231 if (t->c_ispeed == 0)
2232 t->c_ispeed = t->c_ospeed;
2234 /* check requested parameters */
2235 if (t->c_ospeed == 0)
2238 if (t->c_ispeed != t->c_ospeed)
2240 divisor = siodivisor(com->rclk, t->c_ispeed);
2245 /* parameters are OK, convert them to the com struct and the device */
2248 (void)commctl(com, TIOCM_DTR, DMBIC); /* hang up line */
2250 (void)commctl(com, TIOCM_DTR, DMBIS);
2252 switch (cflag & CSIZE) {
2266 if (cflag & PARENB) {
2268 if (!(cflag & PARODD))
2274 if (com->hasfifo && divisor != 0) {
2276 * Use a fifo trigger level low enough so that the input
2277 * latency from the fifo is less than about 16 msec and
2278 * the total latency is less than about 30 msec. These
2279 * latencies are reasonable for humans. Serial comms
2280 * protocols shouldn't expect anything better since modem
2281 * latencies are larger.
2283 * Interrupts can be held up for long periods of time
2284 * due to inefficiencies in other parts of the kernel,
2285 * certain video cards, etc. Setting the FIFO trigger
2286 * point to MEDH instead of HIGH gives us 694uS of slop
2287 * (8 character times) instead of 173uS (2 character times)
2290 com->fifo_image = t->c_ospeed <= 4800
2291 ? FIFO_ENABLE : FIFO_ENABLE | FIFO_RX_MEDH;
2294 * The Hayes ESP card needs the fifo DMA mode bit set
2295 * in compatibility mode. If not, it will interrupt
2296 * for each character received.
2299 com->fifo_image |= FIFO_DMA_MODE;
2301 sio_setreg(com, com_fifo, com->fifo_image);
2305 * This returns with interrupts disabled so that we can complete
2306 * the speed change atomically. Keeping interrupts disabled is
2307 * especially important while com_data is hidden.
2309 (void) siosetwater(com, t->c_ispeed);
2312 sio_setreg(com, com_cfcr, cfcr | CFCR_DLAB);
2314 * Only set the divisor registers if they would change,
2315 * since on some 16550 incompatibles (UMC8669F), setting
2316 * them while input is arriving them loses sync until
2317 * data stops arriving.
2319 dlbl = divisor & 0xFF;
2320 if (sio_getreg(com, com_dlbl) != dlbl)
2321 sio_setreg(com, com_dlbl, dlbl);
2322 dlbh = divisor >> 8;
2323 if (sio_getreg(com, com_dlbh) != dlbh)
2324 sio_setreg(com, com_dlbh, dlbh);
2327 sio_setreg(com, com_cfcr, com->cfcr_image = cfcr);
2329 if (!(tp->t_state & TS_TTSTOP))
2330 com->state |= CS_TTGO;
2332 if (cflag & CRTS_IFLOW) {
2333 if (com->st16650a) {
2334 sio_setreg(com, com_cfcr, 0xbf);
2335 sio_setreg(com, com_fifo,
2336 sio_getreg(com, com_fifo) | 0x40);
2338 com->state |= CS_RTS_IFLOW;
2340 * If CS_RTS_IFLOW just changed from off to on, the change
2341 * needs to be propagated to MCR_RTS. This isn't urgent,
2342 * so do it later by calling comstart() instead of repeating
2343 * a lot of code from comstart() here.
2345 } else if (com->state & CS_RTS_IFLOW) {
2346 com->state &= ~CS_RTS_IFLOW;
2348 * CS_RTS_IFLOW just changed from on to off. Force MCR_RTS
2349 * on here, since comstart() won't do it later.
2351 outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS);
2352 if (com->st16650a) {
2353 sio_setreg(com, com_cfcr, 0xbf);
2354 sio_setreg(com, com_fifo,
2355 sio_getreg(com, com_fifo) & ~0x40);
2361 * Set up state to handle output flow control.
2362 * XXX - worth handling MDMBUF (DCD) flow control at the lowest level?
2363 * Now has 10+ msec latency, while CTS flow has 50- usec latency.
2365 com->state |= CS_ODEVREADY;
2366 com->state &= ~CS_CTS_OFLOW;
2367 if (cflag & CCTS_OFLOW) {
2368 com->state |= CS_CTS_OFLOW;
2369 if (!(com->last_modem_status & MSR_CTS))
2370 com->state &= ~CS_ODEVREADY;
2371 if (com->st16650a) {
2372 sio_setreg(com, com_cfcr, 0xbf);
2373 sio_setreg(com, com_fifo,
2374 sio_getreg(com, com_fifo) | 0x80);
2377 if (com->st16650a) {
2378 sio_setreg(com, com_cfcr, 0xbf);
2379 sio_setreg(com, com_fifo,
2380 sio_getreg(com, com_fifo) & ~0x80);
2384 sio_setreg(com, com_cfcr, com->cfcr_image);
2386 /* XXX shouldn't call functions while intrs are disabled. */
2387 disc_optim(tp, t, com);
2389 * Recover from fiddling with CS_TTGO. We used to call siointr1()
2390 * unconditionally, but that defeated the careful discarding of
2391 * stale input in sioopen().
2393 if (com->state >= (CS_BUSY | CS_TTGO))
2399 if (com->ibufold != NULL) {
2400 free(com->ibufold, M_DEVBUF);
2401 com->ibufold = NULL;
2407 siosetwater(com, speed)
2417 * Make the buffer size large enough to handle a softtty interrupt
2418 * latency of about 2 ticks without loss of throughput or data
2419 * (about 3 ticks if input flow control is not used or not honoured,
2420 * but a bit less for CS5-CS7 modes).
2422 cp4ticks = speed / 10 / hz * 4;
2423 for (ibufsize = 128; ibufsize < cp4ticks;)
2425 if (ibufsize == com->ibufsize) {
2431 * Allocate input buffer. The extra factor of 2 in the size is
2432 * to allow for an error byte for each input byte.
2434 ibuf = malloc(2 * ibufsize, M_DEVBUF, M_WAITOK | M_ZERO);
2436 /* Initialize non-critical variables. */
2437 com->ibufold = com->ibuf;
2438 com->ibufsize = ibufsize;
2441 tp->t_ififosize = 2 * ibufsize;
2442 tp->t_ispeedwat = (speed_t)-1;
2443 tp->t_ospeedwat = (speed_t)-1;
2447 * Read current input buffer, if any. Continue with interrupts
2451 if (com->iptr != com->ibuf)
2455 * Initialize critical variables, including input buffer watermarks.
2456 * The external device is asked to stop sending when the buffer
2457 * exactly reaches high water, or when the high level requests it.
2458 * The high level is notified immediately (rather than at a later
2459 * clock tick) when this watermark is reached.
2460 * The buffer size is chosen so the watermark should almost never
2462 * The low watermark is invisibly 0 since the buffer is always
2463 * emptied all at once.
2465 com->iptr = com->ibuf = ibuf;
2466 com->ibufend = ibuf + ibufsize;
2467 com->ierroff = ibufsize;
2468 com->ihighwater = ibuf + 3 * ibufsize / 4;
2480 unit = DEV_TO_UNIT(tp->t_dev);
2481 com = com_addr(unit);
2486 if (tp->t_state & TS_TTSTOP)
2487 com->state &= ~CS_TTGO;
2489 com->state |= CS_TTGO;
2490 if (tp->t_state & TS_TBLOCK) {
2491 if (com->mcr_image & MCR_RTS && com->state & CS_RTS_IFLOW)
2492 outb(com->modem_ctl_port, com->mcr_image &= ~MCR_RTS);
2494 if (!(com->mcr_image & MCR_RTS) && com->iptr < com->ihighwater
2495 && com->state & CS_RTS_IFLOW)
2496 outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS);
2499 if (tp->t_state & (TS_TIMEOUT | TS_TTSTOP)) {
2504 if (tp->t_outq.c_cc != 0) {
2508 if (!com->obufs[0].l_queued) {
2509 com->obufs[0].l_tail
2510 = com->obuf1 + q_to_b(&tp->t_outq, com->obuf1,
2512 com->obufs[0].l_next = NULL;
2513 com->obufs[0].l_queued = TRUE;
2515 if (com->state & CS_BUSY) {
2516 qp = com->obufq.l_next;
2517 while ((next = qp->l_next) != NULL)
2519 qp->l_next = &com->obufs[0];
2521 com->obufq.l_head = com->obufs[0].l_head;
2522 com->obufq.l_tail = com->obufs[0].l_tail;
2523 com->obufq.l_next = &com->obufs[0];
2524 com->state |= CS_BUSY;
2528 if (tp->t_outq.c_cc != 0 && !com->obufs[1].l_queued) {
2529 com->obufs[1].l_tail
2530 = com->obuf2 + q_to_b(&tp->t_outq, com->obuf2,
2532 com->obufs[1].l_next = NULL;
2533 com->obufs[1].l_queued = TRUE;
2535 if (com->state & CS_BUSY) {
2536 qp = com->obufq.l_next;
2537 while ((next = qp->l_next) != NULL)
2539 qp->l_next = &com->obufs[1];
2541 com->obufq.l_head = com->obufs[1].l_head;
2542 com->obufq.l_tail = com->obufs[1].l_tail;
2543 com->obufq.l_next = &com->obufs[1];
2544 com->state |= CS_BUSY;
2548 tp->t_state |= TS_BUSY;
2551 if (com->state >= (CS_BUSY | CS_TTGO))
2552 siointr1(com); /* fake interrupt to start output */
2565 com = com_addr(DEV_TO_UNIT(tp->t_dev));
2566 if (com == NULL || com->gone)
2572 /* XXX avoid h/w bug. */
2575 sio_setreg(com, com_fifo,
2576 FIFO_XMT_RST | com->fifo_image);
2577 com->obufs[0].l_queued = FALSE;
2578 com->obufs[1].l_queued = FALSE;
2579 if (com->state & CS_ODONE)
2580 com_events -= LOTS_OF_EVENTS;
2581 com->state &= ~(CS_ODONE | CS_BUSY);
2582 com->tp->t_state &= ~TS_BUSY;
2587 /* XXX avoid h/w bug. */
2590 sio_setreg(com, com_fifo,
2591 FIFO_RCV_RST | com->fifo_image);
2592 com_events -= (com->iptr - com->ibuf);
2593 com->iptr = com->ibuf;
2600 commctl(com, bits, how)
2609 bits = TIOCM_LE; /* XXX - always enabled while open */
2610 mcr = com->mcr_image;
2615 msr = com->prev_modem_status;
2623 * XXX - MSR_RI is naturally volatile, and we make MSR_TERI
2624 * more volatile by reading the modem status a lot. Perhaps
2625 * we should latch both bits until the status is read here.
2627 if (msr & (MSR_RI | MSR_TERI))
2632 if (bits & TIOCM_DTR)
2634 if (bits & TIOCM_RTS)
2641 outb(com->modem_ctl_port,
2642 com->mcr_image = mcr | (com->mcr_image & MCR_IENABLE));
2645 outb(com->modem_ctl_port, com->mcr_image |= mcr);
2648 outb(com->modem_ctl_port, com->mcr_image &= ~mcr);
2663 * Set our timeout period to 1 second if no polled devices are open.
2664 * Otherwise set it to max(1/200, 1/hz).
2665 * Enable timeouts iff some device is open.
2667 callout_stop(&sio_timeout_handle);
2670 for (unit = 0; unit < sio_numunits; ++unit) {
2671 com = com_addr(unit);
2672 if (com != NULL && com->tp != NULL
2673 && com->tp->t_state & TS_ISOPEN && !com->gone) {
2675 if (com->poll || com->poll_output) {
2676 sio_timeout = hz > 200 ? hz / 200 : 1;
2682 sio_timeouts_until_log = hz / sio_timeout;
2683 callout_reset(&sio_timeout_handle, sio_timeout,
2686 /* Flush error messages, if any. */
2687 sio_timeouts_until_log = 1;
2688 comwakeup((void *)NULL);
2689 callout_stop(&sio_timeout_handle);
2700 callout_reset(&sio_timeout_handle, sio_timeout, comwakeup, NULL);
2703 * Recover from lost output interrupts.
2704 * Poll any lines that don't use interrupts.
2706 for (unit = 0; unit < sio_numunits; ++unit) {
2707 com = com_addr(unit);
2708 if (com != NULL && !com->gone
2709 && (com->state >= (CS_BUSY | CS_TTGO) || com->poll)) {
2717 * Check for and log errors, but not too often.
2719 if (--sio_timeouts_until_log > 0)
2721 sio_timeouts_until_log = hz / sio_timeout;
2722 for (unit = 0; unit < sio_numunits; ++unit) {
2725 com = com_addr(unit);
2730 for (errnum = 0; errnum < CE_NTYPES; ++errnum) {
2735 delta = com->delta_error_counts[errnum];
2736 com->delta_error_counts[errnum] = 0;
2740 total = com->error_counts[errnum] += delta;
2741 log(LOG_ERR, "sio%d: %u more %s%s (total %lu)\n",
2742 unit, delta, error_desc[errnum],
2743 delta == 1 ? "" : "s", total);
2749 disc_optim(tp, t, com)
2754 if (!(t->c_iflag & (ICRNL | IGNCR | IMAXBEL | INLCR | ISTRIP | IXON))
2755 && (!(t->c_iflag & BRKINT) || (t->c_iflag & IGNBRK))
2756 && (!(t->c_iflag & PARMRK)
2757 || (t->c_iflag & (IGNPAR | IGNBRK)) == (IGNPAR | IGNBRK))
2758 && !(t->c_lflag & (ECHO | ICANON | IEXTEN | ISIG | PENDIN))
2759 && linesw[tp->t_line].l_rint == ttyinput)
2760 tp->t_state |= TS_CAN_BYPASS_L_RINT;
2762 tp->t_state &= ~TS_CAN_BYPASS_L_RINT;
2763 com->hotchar = linesw[tp->t_line].l_hotchar;
2767 * Following are all routines needed for SIO to act as console
2769 #include <sys/cons.h>
2779 static speed_t siocngetspeed (Port_t, u_long rclk);
2780 static void siocnclose (struct siocnstate *sp, Port_t iobase);
2781 static void siocnopen (struct siocnstate *sp, Port_t iobase, int speed);
2782 static void siocntxwait (Port_t iobase);
2784 static cn_probe_t siocnprobe;
2785 static cn_init_t siocninit;
2786 static cn_checkc_t siocncheckc;
2787 static cn_getc_t siocngetc;
2788 static cn_putc_t siocnputc;
2791 CONS_DRIVER(sio, siocnprobe, siocninit, NULL, siocngetc, siocncheckc,
2795 /* To get the GDB related variables */
2797 #include <ddb/ddb.h>
2807 * Wait for any pending transmission to finish. Required to avoid
2808 * the UART lockup bug when the speed is changed, and for normal
2812 while ((inb(iobase + com_lsr) & (LSR_TSRE | LSR_TXRDY))
2813 != (LSR_TSRE | LSR_TXRDY) && --timo != 0)
2818 * Read the serial port specified and try to figure out what speed
2819 * it's currently running at. We're assuming the serial port has
2820 * been initialized and is basicly idle. This routine is only intended
2821 * to be run at system startup.
2823 * If the value read from the serial port doesn't make sense, return 0.
2827 siocngetspeed(iobase, rclk)
2836 cfcr = inb(iobase + com_cfcr);
2837 outb(iobase + com_cfcr, CFCR_DLAB | cfcr);
2839 dlbl = inb(iobase + com_dlbl);
2840 dlbh = inb(iobase + com_dlbh);
2842 outb(iobase + com_cfcr, cfcr);
2844 divisor = dlbh << 8 | dlbl;
2846 /* XXX there should be more sanity checking. */
2849 return (rclk / (16UL * divisor));
2853 siocnopen(sp, iobase, speed)
2854 struct siocnstate *sp;
2863 * Save all the device control registers except the fifo register
2864 * and set our default ones (cs8 -parenb speed=comdefaultrate).
2865 * We can't save the fifo register since it is read-only.
2867 sp->ier = inb(iobase + com_ier);
2868 outb(iobase + com_ier, 0); /* spltty() doesn't stop siointr() */
2869 siocntxwait(iobase);
2870 sp->cfcr = inb(iobase + com_cfcr);
2871 outb(iobase + com_cfcr, CFCR_DLAB | CFCR_8BITS);
2872 sp->dlbl = inb(iobase + com_dlbl);
2873 sp->dlbh = inb(iobase + com_dlbh);
2875 * Only set the divisor registers if they would change, since on
2876 * some 16550 incompatibles (Startech), setting them clears the
2877 * data input register. This also reduces the effects of the
2880 divisor = siodivisor(comdefaultrclk, speed);
2881 dlbl = divisor & 0xFF;
2882 if (sp->dlbl != dlbl)
2883 outb(iobase + com_dlbl, dlbl);
2884 dlbh = divisor >> 8;
2885 if (sp->dlbh != dlbh)
2886 outb(iobase + com_dlbh, dlbh);
2887 outb(iobase + com_cfcr, CFCR_8BITS);
2888 sp->mcr = inb(iobase + com_mcr);
2890 * We don't want interrupts, but must be careful not to "disable"
2891 * them by clearing the MCR_IENABLE bit, since that might cause
2892 * an interrupt by floating the IRQ line.
2894 outb(iobase + com_mcr, (sp->mcr & MCR_IENABLE) | MCR_DTR | MCR_RTS);
2898 siocnclose(sp, iobase)
2899 struct siocnstate *sp;
2903 * Restore the device control registers.
2905 siocntxwait(iobase);
2906 outb(iobase + com_cfcr, CFCR_DLAB | CFCR_8BITS);
2907 if (sp->dlbl != inb(iobase + com_dlbl))
2908 outb(iobase + com_dlbl, sp->dlbl);
2909 if (sp->dlbh != inb(iobase + com_dlbh))
2910 outb(iobase + com_dlbh, sp->dlbh);
2911 outb(iobase + com_cfcr, sp->cfcr);
2913 * XXX damp oscillations of MCR_DTR and MCR_RTS by not restoring them.
2915 outb(iobase + com_mcr, sp->mcr | MCR_DTR | MCR_RTS);
2916 outb(iobase + com_ier, sp->ier);
2927 struct siocnstate sp;
2930 * Find our first enabled console, if any. If it is a high-level
2931 * console device, then initialize it and return successfully.
2932 * If it is a low-level console device, then initialize it and
2933 * return unsuccessfully. It must be initialized in both cases
2934 * for early use by console drivers and debuggers. Initializing
2935 * the hardware is not necessary in all cases, since the i/o
2936 * routines initialize it on the fly, but it is necessary if
2937 * input might arrive while the hardware is switched back to an
2938 * uninitialized state. We can't handle multiple console devices
2939 * yet because our low-level routines don't take a device arg.
2940 * We trust the user to set the console flags properly so that we
2941 * don't need to probe.
2943 cp->cn_pri = CN_DEAD;
2945 for (unit = 0; unit < 16; unit++) { /* XXX need to know how many */
2948 if (resource_int_value("sio", unit, "disabled", &disabled) == 0) {
2952 if (resource_int_value("sio", unit, "flags", &flags))
2954 if (COM_CONSOLE(flags) || COM_DEBUGGER(flags)) {
2958 if (resource_int_value("sio", unit, "port", &port))
2962 if (boothowto & RB_SERIAL) {
2964 siocngetspeed(iobase, comdefaultrclk);
2966 comdefaultrate = boot_speed;
2970 * Initialize the divisor latch. We can't rely on
2971 * siocnopen() to do this the first time, since it
2972 * avoids writing to the latch if the latch appears
2973 * to have the correct value. Also, if we didn't
2974 * just read the speed from the hardware, then we
2975 * need to set the speed in hardware so that
2976 * switching it later is null.
2978 cfcr = inb(iobase + com_cfcr);
2979 outb(iobase + com_cfcr, CFCR_DLAB | cfcr);
2980 divisor = siodivisor(comdefaultrclk, comdefaultrate);
2981 outb(iobase + com_dlbl, divisor & 0xff);
2982 outb(iobase + com_dlbh, divisor >> 8);
2983 outb(iobase + com_cfcr, cfcr);
2985 siocnopen(&sp, iobase, comdefaultrate);
2988 if (COM_CONSOLE(flags) && !COM_LLCONSOLE(flags)) {
2989 cp->cn_dev = make_dev(&sio_cdevsw, unit,
2990 UID_ROOT, GID_WHEEL, 0600,
2992 cp->cn_pri = COM_FORCECONSOLE(flags)
2993 || boothowto & RB_SERIAL
2994 ? CN_REMOTE : CN_NORMAL;
2995 siocniobase = iobase;
2998 if (COM_DEBUGGER(flags)) {
2999 printf("sio%d: gdb debugging port\n", unit);
3000 siogdbiobase = iobase;
3003 gdbdev = make_dev(&sio_cdevsw, unit,
3004 UID_ROOT, GID_WHEEL, 0600,
3006 gdb_getc = siocngetc;
3007 gdb_putc = siocnputc;
3015 * XXX Ugly Compatability.
3016 * If no gdb port has been specified, set it to be the console
3017 * as some configuration files don't specify the gdb port.
3019 if (gdbdev == NODEV && (boothowto & RB_GDB)) {
3020 printf("Warning: no GDB port specified. Defaulting to sio%d.\n",
3022 printf("Set flag 0x80 on desired GDB port in your\n");
3023 printf("configuration file (currently sio only).\n");
3024 siogdbiobase = siocniobase;
3025 siogdbunit = siocnunit;
3026 gdbdev = make_dev(&sio_cdevsw, siocnunit,
3027 UID_ROOT, GID_WHEEL, 0600,
3028 "ttyd%r", siocnunit);
3029 gdb_getc = siocngetc;
3030 gdb_putc = siocnputc;
3038 CONS_DRIVER(sio, NULL, NULL, NULL, siocngetc, siocncheckc, siocnputc, NULL);
3041 siocnattach(port, speed)
3048 struct siocnstate sp;
3051 comdefaultrate = speed;
3052 sio_consdev.cn_pri = CN_NORMAL;
3053 sio_consdev.cn_dev = make_dev(&sio_cdevsw, 0, UID_ROOT, GID_WHEEL,
3059 * Initialize the divisor latch. We can't rely on
3060 * siocnopen() to do this the first time, since it
3061 * avoids writing to the latch if the latch appears
3062 * to have the correct value. Also, if we didn't
3063 * just read the speed from the hardware, then we
3064 * need to set the speed in hardware so that
3065 * switching it later is null.
3067 cfcr = inb(siocniobase + com_cfcr);
3068 outb(siocniobase + com_cfcr, CFCR_DLAB | cfcr);
3069 divisor = siodivisor(comdefaultrclk, comdefaultrate);
3070 outb(siocniobase + com_dlbl, divisor & 0xff);
3071 outb(siocniobase + com_dlbh, divisor >> 8);
3072 outb(siocniobase + com_cfcr, cfcr);
3074 siocnopen(&sp, siocniobase, comdefaultrate);
3077 cn_tab = &sio_consdev;
3082 siogdbattach(port, speed)
3089 struct siocnstate sp;
3091 siogdbiobase = port;
3092 gdbdefaultrate = speed;
3097 * Initialize the divisor latch. We can't rely on
3098 * siocnopen() to do this the first time, since it
3099 * avoids writing to the latch if the latch appears
3100 * to have the correct value. Also, if we didn't
3101 * just read the speed from the hardware, then we
3102 * need to set the speed in hardware so that
3103 * switching it later is null.
3105 cfcr = inb(siogdbiobase + com_cfcr);
3106 outb(siogdbiobase + com_cfcr, CFCR_DLAB | cfcr);
3107 divisor = siodivisor(comdefaultrclk, gdbdefaultrate);
3108 outb(siogdbiobase + com_dlbl, divisor & 0xff);
3109 outb(siogdbiobase + com_dlbh, divisor >> 8);
3110 outb(siogdbiobase + com_cfcr, cfcr);
3112 siocnopen(&sp, siogdbiobase, gdbdefaultrate);
3124 comconsole = DEV_TO_UNIT(cp->cn_dev);
3134 struct siocnstate sp;
3136 if (minor(dev) == siogdbunit)
3137 iobase = siogdbiobase;
3139 iobase = siocniobase;
3141 siocnopen(&sp, iobase, comdefaultrate);
3142 if (inb(iobase + com_lsr) & LSR_RXRDY)
3143 c = inb(iobase + com_data);
3146 siocnclose(&sp, iobase);
3159 struct siocnstate sp;
3161 if (minor(dev) == siogdbunit)
3162 iobase = siogdbiobase;
3164 iobase = siocniobase;
3166 siocnopen(&sp, iobase, comdefaultrate);
3167 while (!(inb(iobase + com_lsr) & LSR_RXRDY))
3169 c = inb(iobase + com_data);
3170 siocnclose(&sp, iobase);
3181 struct siocnstate sp;
3184 if (minor(dev) == siogdbunit)
3185 iobase = siogdbiobase;
3187 iobase = siocniobase;
3189 siocnopen(&sp, iobase, comdefaultrate);
3190 siocntxwait(iobase);
3191 outb(iobase + com_data, c);
3192 siocnclose(&sp, iobase);
3203 struct siocnstate sp;
3205 iobase = siogdbiobase;
3207 siocnopen(&sp, iobase, gdbdefaultrate);
3208 while (!(inb(iobase + com_lsr) & LSR_RXRDY))
3210 c = inb(iobase + com_data);
3211 siocnclose(&sp, iobase);
3221 struct siocnstate sp;
3224 siocnopen(&sp, siogdbiobase, gdbdefaultrate);
3225 siocntxwait(siogdbiobase);
3226 outb(siogdbiobase + com_data, c);
3227 siocnclose(&sp, siogdbiobase);
3232 DRIVER_MODULE(sio, isa, sio_isa_driver, sio_devclass, 0, 0);
3234 DRIVER_MODULE(sio, pci, sio_pci_driver, sio_devclass, 0, 0);
3237 DRIVER_MODULE(sio, puc, sio_puc_driver, sio_devclass, 0, 0);