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. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * $FreeBSD: src/sys/isa/sio.c,v 1.291.2.35 2003/05/18 08:51:15 murray Exp $
32 * from: @(#)com.c 7.5 (Berkeley) 5/16/91
33 * from: i386/isa sio.c,v 1.234
36 #include "opt_comconsole.h"
43 * Serial driver, based on 386BSD-0.1 com driver.
44 * Mostly rewritten to use pseudo-DMA.
45 * Works for National Semiconductor NS8250-NS16550AF UARTs.
46 * COM driver, based on HP dca driver.
48 * Changes for PC-Card integration:
49 * - Added PC-Card driver table and handlers
51 #include <sys/param.h>
52 #include <sys/systm.h>
53 #include <sys/reboot.h>
54 #include <sys/malloc.h>
58 #include <sys/module.h>
60 #include <sys/dkstat.h>
61 #include <sys/fcntl.h>
62 #include <sys/interrupt.h>
63 #include <sys/kernel.h>
64 #include <sys/syslog.h>
65 #include <sys/sysctl.h>
68 #include <sys/timepps.h>
69 #include <sys/thread2.h>
70 #include <sys/devfs.h>
71 #include <sys/consio.h>
73 #include <machine/limits.h>
75 #include <bus/isa/isareg.h>
76 #include <bus/isa/isavar.h>
78 #include <bus/pci/pcireg.h>
79 #include <bus/pci/pcivar.h>
82 #include <dev/misc/puc/pucvar.h>
84 #include <machine/lock.h>
86 #include <machine/clock.h>
89 #include "sio_private.h"
92 #include "../ic_layer/esp.h"
95 #define LOTS_OF_EVENTS 64 /* helps separate urgent events from input */
97 #define CALLOUT_MASK 0x80
98 #define CONTROL_MASK 0x60
99 #define CONTROL_INIT_STATE 0x20
100 #define CONTROL_LOCK_STATE 0x40
101 #define DEV_TO_UNIT(dev) (MINOR_TO_UNIT(minor(dev)))
102 #define MINOR_TO_UNIT(mynor) ((((mynor) & ~0xffffU) >> (8 + 3)) \
104 #define UNIT_TO_MINOR(unit) ((((unit) & ~0x1fU) << (8 + 3)) \
107 #define com_scr 7 /* scratch register for 16450-16550 (R/W) */
109 #define sio_getreg(com, off) \
110 (bus_space_read_1((com)->bst, (com)->bsh, (off)))
111 #define sio_setreg(com, off, value) \
112 (bus_space_write_1((com)->bst, (com)->bsh, (off), (value)))
116 * (CS_BUSY | CS_TTGO) and (CS_BUSY | CS_TTGO | CS_ODEVREADY) must be higher
117 * than the other bits so that they can be tested as a group without masking
120 * The following com and tty flags correspond closely:
121 * CS_BUSY = TS_BUSY (maintained by comstart(), siopoll() and
123 * CS_TTGO = ~TS_TTSTOP (maintained by comparam() and comstart())
124 * CS_CTS_OFLOW = CCTS_OFLOW (maintained by comparam())
125 * CS_RTS_IFLOW = CRTS_IFLOW (maintained by comparam())
126 * TS_FLUSH is not used.
127 * XXX I think TIOCSETA doesn't clear TS_TTSTOP when it clears IXON.
128 * XXX CS_*FLOW should be CF_*FLOW in com->flags (control flags not state).
130 #define CS_BUSY 0x80 /* output in progress */
131 #define CS_TTGO 0x40 /* output not stopped by XOFF */
132 #define CS_ODEVREADY 0x20 /* external device h/w ready (CTS) */
133 #define CS_CHECKMSR 1 /* check of MSR scheduled */
134 #define CS_CTS_OFLOW 2 /* use CTS output flow control */
135 #define CS_DTR_OFF 0x10 /* DTR held off */
136 #define CS_ODONE 4 /* output completed */
137 #define CS_RTS_IFLOW 8 /* use RTS input flow control */
138 #define CSE_BUSYCHECK 1 /* siobusycheck() scheduled */
140 static char const * const error_desc
[] = {
143 #define CE_INTERRUPT_BUF_OVERFLOW 1
144 "interrupt-level buffer overflow",
145 #define CE_TTY_BUF_OVERFLOW 2
146 "tty-level buffer overflow",
150 static int espattach (struct com_s
*com
, Port_t esp_port
);
152 static int sio_isa_attach (device_t dev
);
154 static timeout_t siobusycheck
;
155 static u_int
siodivisor (u_long rclk
, speed_t speed
);
156 static timeout_t siodtrwakeup
;
157 static void comhardclose (struct com_s
*com
);
158 static void sioinput (struct com_s
*com
);
159 static void siointr1 (struct com_s
*com
);
160 static void siointr (void *arg
);
161 static int commctl (struct com_s
*com
, int bits
, int how
);
162 static int comparam (struct tty
*tp
, struct termios
*t
);
163 static inthand2_t siopoll
;
164 static int sio_isa_probe (device_t dev
);
165 static void siosettimeout (void);
166 static int siosetwater (struct com_s
*com
, speed_t speed
);
167 static void comstart (struct tty
*tp
);
168 static void comstop (struct tty
*tp
, int rw
);
169 static timeout_t comwakeup
;
170 static void disc_optim (struct tty
*tp
, struct termios
*t
,
174 static int sio_pci_attach (device_t dev
);
175 static void sio_pci_kludge_unit (device_t dev
);
176 static int sio_pci_probe (device_t dev
);
177 #endif /* NPCI > 0 */
180 static int sio_puc_attach (device_t dev
);
181 static int sio_puc_probe (device_t dev
);
182 #endif /* NPUC > 0 */
184 static char driver_name
[] = "sio";
186 /* table and macro for fast conversion from a unit number to its com struct */
187 devclass_t sio_devclass
;
188 #define com_addr(unit) ((struct com_s *) \
189 devclass_get_softc(sio_devclass, unit))
191 static device_method_t sio_isa_methods
[] = {
192 /* Device interface */
193 DEVMETHOD(device_probe
, sio_isa_probe
),
194 DEVMETHOD(device_attach
, sio_isa_attach
),
199 static driver_t sio_isa_driver
= {
202 sizeof(struct com_s
),
206 static device_method_t sio_pci_methods
[] = {
207 /* Device interface */
208 DEVMETHOD(device_probe
, sio_pci_probe
),
209 DEVMETHOD(device_attach
, sio_pci_attach
),
214 static driver_t sio_pci_driver
= {
217 sizeof(struct com_s
),
219 #endif /* NPCI > 0 */
222 static device_method_t sio_puc_methods
[] = {
223 /* Device interface */
224 DEVMETHOD(device_probe
, sio_puc_probe
),
225 DEVMETHOD(device_attach
, sio_puc_attach
),
230 static driver_t sio_puc_driver
= {
233 sizeof(struct com_s
),
235 #endif /* NPUC > 0 */
237 static d_open_t sioopen
;
238 static d_close_t sioclose
;
239 static d_read_t sioread
;
240 static d_write_t siowrite
;
241 static d_ioctl_t sioioctl
;
243 static struct dev_ops sio_ops
= {
244 { driver_name
, 0, D_TTY
},
250 .d_kqfilter
= ttykqfilter
,
251 .d_revoke
= ttyrevoke
255 static volatile speed_t comdefaultrate
= CONSPEED
;
256 static u_long comdefaultrclk
= DEFAULT_RCLK
;
257 SYSCTL_ULONG(_machdep
, OID_AUTO
, conrclk
, CTLFLAG_RW
, &comdefaultrclk
, 0, "");
258 static u_int com_events
; /* input chars + weighted output completions */
259 static Port_t siocniobase
;
260 static int siocnunit
;
261 static Port_t siogdbiobase
;
262 static int siogdbunit
= -1;
263 static bool_t sio_registered
;
264 static int sio_timeout
;
265 static int sio_timeouts_until_log
;
266 static struct callout sio_timeout_handle
;
267 static int sio_numunits
;
270 /* XXX configure this properly. */
271 static Port_t likely_com_ports
[] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8, };
272 static Port_t likely_esp_ports
[] = { 0x140, 0x180, 0x280, 0 };
276 * handle sysctl read/write requests for console speed
278 * In addition to setting comdefaultrate for I/O through /dev/console,
279 * also set the initial and lock values for the /dev/ttyXX device
280 * if there is one associated with the console. Finally, if the /dev/tty
281 * device has already been open, change the speed on the open running port
286 sysctl_machdep_comdefaultrate(SYSCTL_HANDLER_ARGS
)
293 lwkt_gettoken(&tty_token
);
294 newspeed
= comdefaultrate
;
296 error
= sysctl_handle_opaque(oidp
, &newspeed
, sizeof newspeed
, req
);
297 if (error
|| !req
->newptr
) {
298 lwkt_reltoken(&tty_token
);
302 comdefaultrate
= newspeed
;
304 if (comconsole
< 0) { /* serial console not selected? */
305 lwkt_reltoken(&tty_token
);
309 com
= com_addr(comconsole
);
311 lwkt_reltoken(&tty_token
);
316 * set the initial and lock rates for /dev/ttydXX and /dev/cuaXX
317 * (note, the lock rates really are boolean -- if non-zero, disallow
320 com
->it_in
.c_ispeed
= com
->it_in
.c_ospeed
=
321 com
->lt_in
.c_ispeed
= com
->lt_in
.c_ospeed
=
322 com
->it_out
.c_ispeed
= com
->it_out
.c_ospeed
=
323 com
->lt_out
.c_ispeed
= com
->lt_out
.c_ospeed
= comdefaultrate
;
326 * if we're open, change the running rate too
329 if (tp
&& (tp
->t_state
& TS_ISOPEN
)) {
330 tp
->t_termios
.c_ispeed
=
331 tp
->t_termios
.c_ospeed
= comdefaultrate
;
333 error
= comparam(tp
, &tp
->t_termios
);
336 lwkt_reltoken(&tty_token
);
340 SYSCTL_PROC(_machdep
, OID_AUTO
, conspeed
, CTLTYPE_INT
| CTLFLAG_RW
,
341 0, 0, sysctl_machdep_comdefaultrate
, "I", "");
350 static struct pci_ids pci_ids
[] = {
351 { 0x100812b9, "3COM PCI FaxModem", 0x10 },
352 { 0x2000131f, "CyberSerial (1-port) 16550", 0x10 },
353 { 0x01101407, "Koutech IOFLEX-2S PCI Dual Port Serial", 0x10 },
354 { 0x01111407, "Koutech IOFLEX-2S PCI Dual Port Serial", 0x10 },
355 { 0x048011c1, "Lucent kermit based PCI Modem", 0x14 },
356 { 0x95211415, "Oxford Semiconductor PCI Dual Port Serial", 0x10 },
357 { 0x7101135e, "SeaLevel Ultra 530.PCI Single Port Serial", 0x18 },
358 { 0x0000151f, "SmartLink 5634PCV SurfRider", 0x10 },
359 { 0x98459710, "Netmos Nm9845 PCI Bridge with Dual UART", 0x10 },
360 { 0x8c3d8086, "Intel Lynx Point KT Controller", 0x10 },
361 { 0x9c3d8086, "Intel Lynx Point-LP HECI KT", 0x10 },
362 { 0x8cbd8086, "Intel Wildcat Point KT Controller", 0x10 },
363 { 0x9cbd8086, "Intel Wildcat Point-LP KT Controller", 0x10 },
364 { 0x00000000, NULL
, 0 }
368 sio_pci_attach(device_t dev
)
373 type
= pci_get_devid(dev
);
375 while (id
->type
&& id
->type
!= type
)
377 if (id
->desc
== NULL
)
379 sio_pci_kludge_unit(dev
);
380 return (sioattach(dev
, id
->rid
, 0UL));
384 * Don't cut and paste this to other drivers. It is a horrible kludge
385 * which will fail to work and also be unnecessary in future versions.
388 sio_pci_kludge_unit(device_t dev
)
397 while (resource_int_value("sio", unit
, "port", &start
) == 0 &&
400 if (device_get_unit(dev
) < unit
) {
401 dc
= device_get_devclass(dev
);
402 while (devclass_get_device(dc
, unit
))
404 device_printf(dev
, "moving to sio%d\n", unit
);
405 err
= device_set_unit(dev
, unit
); /* EVIL DO NOT COPY */
407 device_printf(dev
, "error moving device %d\n", err
);
412 sio_pci_probe(device_t dev
)
417 type
= pci_get_devid(dev
);
419 while (id
->type
&& id
->type
!= type
)
421 if (id
->desc
== NULL
)
423 device_set_desc(dev
, id
->desc
);
424 return (sioprobe(dev
, id
->rid
, 0UL));
426 #endif /* NPCI > 0 */
430 sio_puc_attach(device_t dev
)
434 if (BUS_READ_IVAR(device_get_parent(dev
), dev
, PUC_IVAR_FREQ
,
437 return (sioattach(dev
, 0, rclk
));
441 sio_puc_probe(device_t dev
)
445 if (BUS_READ_IVAR(device_get_parent(dev
), dev
, PUC_IVAR_FREQ
,
448 return (sioprobe(dev
, 0, rclk
));
452 static struct isa_pnp_id sio_ids
[] = {
453 {0x0005d041, "Standard PC COM port"}, /* PNP0500 */
454 {0x0105d041, "16550A-compatible COM port"}, /* PNP0501 */
455 {0x0205d041, "Multiport serial device (non-intelligent 16550)"}, /* PNP0502 */
456 {0x1005d041, "Generic IRDA-compatible device"}, /* PNP0510 */
457 {0x1105d041, "Generic IRDA-compatible device"}, /* PNP0511 */
458 /* Devices that do not have a compatid */
459 {0x12206804, NULL
}, /* ACH2012 - 5634BTS 56K Video Ready Modem */
460 {0x7602a904, NULL
}, /* AEI0276 - 56K v.90 Fax Modem (LKT) */
461 {0x00007905, NULL
}, /* AKY0000 - 56K Plug&Play Modem */
462 {0x21107905, NULL
}, /* AKY1021 - 56K Plug&Play Modem */
463 {0x01405407, NULL
}, /* AZT4001 - AZT3000 PnP SOUND DEVICE, MODEM */
464 {0x56039008, NULL
}, /* BDP0356 - Best Data 56x2 */
465 {0x56159008, NULL
}, /* BDP1556 - B.D. Smart One 56SPS,Voice Modem*/
466 {0x36339008, NULL
}, /* BDP3336 - Best Data Prods. 336F */
467 {0x0014490a, NULL
}, /* BRI1400 - Boca 33.6 PnP */
468 {0x0015490a, NULL
}, /* BRI1500 - Internal Fax Data */
469 {0x0034490a, NULL
}, /* BRI3400 - Internal ACF Modem */
470 {0x0094490a, NULL
}, /* BRI9400 - Boca K56Flex PnP */
471 {0x00b4490a, NULL
}, /* BRIB400 - Boca 56k PnP */
472 {0x0030320d, NULL
}, /* CIR3000 - Cirrus Logic V43 */
473 {0x0100440e, NULL
}, /* CRD0001 - Cardinal MVP288IV ? */
474 {0x01308c0e, NULL
}, /* CTL3001 - Creative Labs Phoneblaster */
475 {0x36033610, NULL
}, /* DAV0336 - DAVICOM 336PNP MODEM */
476 {0x01009416, NULL
}, /* ETT0001 - E-Tech Bullet 33k6 PnP */
477 {0x0000aa1a, NULL
}, /* FUJ0000 - FUJITSU Modem 33600 PNP/I2 */
478 {0x1200c31e, NULL
}, /* GVC0012 - VF1128HV-R9 (win modem?) */
479 {0x0303c31e, NULL
}, /* GVC0303 - MaxTech 33.6 PnP D/F/V */
480 {0x0505c31e, NULL
}, /* GVC0505 - GVC 56k Faxmodem */
481 {0x0116c31e, NULL
}, /* GVC1601 - Rockwell V.34 Plug & Play Modem */
482 {0x0050c31e, NULL
}, /* GVC5000 - some GVC modem */
483 {0x3800f91e, NULL
}, /* GWY0038 - Telepath with v.90 */
484 {0x9062f91e, NULL
}, /* GWY6290 - Telepath with x2 Technology */
485 {0x8100e425, NULL
}, /* IOD0081 - I-O DATA DEVICE,INC. IFML-560 */
486 {0x21002534, NULL
}, /* MAE0021 - Jetstream Int V.90 56k Voice Series 2*/
487 {0x0000f435, NULL
}, /* MOT0000 - Motorola ModemSURFR 33.6 Intern */
488 {0x5015f435, NULL
}, /* MOT1550 - Motorola ModemSURFR 56K Modem */
489 {0xf015f435, NULL
}, /* MOT15F0 - Motorola VoiceSURFR 56K Modem */
490 {0x6045f435, NULL
}, /* MOT4560 - Motorola ? */
491 {0x61e7a338, NULL
}, /* NECE761 - 33.6Modem */
492 {0x08804f3f, NULL
}, /* OZO8008 - Zoom (33.6k Modem) */
493 {0x0f804f3f, NULL
}, /* OZO800f - Zoom 2812 (56k Modem) */
494 {0x39804f3f, NULL
}, /* OZO8039 - Zoom 56k flex */
495 {0x00914f3f, NULL
}, /* OZO9100 - Zoom 2919 (K56 Faxmodem) */
496 {0x3024a341, NULL
}, /* PMC2430 - Pace 56 Voice Internal Modem */
497 {0x1000eb49, NULL
}, /* ROK0010 - Rockwell ? */
498 {0x1200b23d, NULL
}, /* RSS0012 - OMRON ME5614ISA */
499 {0x5002734a, NULL
}, /* RSS0250 - 5614Jx3(G) Internal Modem */
500 {0x6202734a, NULL
}, /* RSS0262 - 5614Jx3[G] V90+K56Flex Modem */
501 {0x1010104d, NULL
}, /* SHP1010 - Rockwell 33600bps Modem */
502 {0xc100ad4d, NULL
}, /* SMM00C1 - Leopard 56k PnP */
503 {0x9012b04e, NULL
}, /* SUP1290 - Supra ? */
504 {0x1013b04e, NULL
}, /* SUP1310 - SupraExpress 336i PnP */
505 {0x8013b04e, NULL
}, /* SUP1380 - SupraExpress 288i PnP Voice */
506 {0x8113b04e, NULL
}, /* SUP1381 - SupraExpress 336i PnP Voice */
507 {0x5016b04e, NULL
}, /* SUP1650 - Supra 336i Sp Intl */
508 {0x7016b04e, NULL
}, /* SUP1670 - Supra 336i V+ Intl */
509 {0x7420b04e, NULL
}, /* SUP2070 - Supra ? */
510 {0x8020b04e, NULL
}, /* SUP2080 - Supra ? */
511 {0x8420b04e, NULL
}, /* SUP2084 - SupraExpress 56i PnP */
512 {0x7121b04e, NULL
}, /* SUP2171 - SupraExpress 56i Sp? */
513 {0x8024b04e, NULL
}, /* SUP2480 - Supra ? */
514 {0x01007256, NULL
}, /* USR0001 - U.S. Robotics Inc., Sportster W */
515 {0x02007256, NULL
}, /* USR0002 - U.S. Robotics Inc. Sportster 33. */
516 {0x04007256, NULL
}, /* USR0004 - USR Sportster 14.4k */
517 {0x06007256, NULL
}, /* USR0006 - USR Sportster 33.6k */
518 {0x11007256, NULL
}, /* USR0011 - USR ? */
519 {0x01017256, NULL
}, /* USR0101 - USR ? */
520 {0x30207256, NULL
}, /* USR2030 - U.S.Robotics Inc. Sportster 560 */
521 {0x50207256, NULL
}, /* USR2050 - U.S.Robotics Inc. Sportster 33. */
522 {0x70207256, NULL
}, /* USR2070 - U.S.Robotics Inc. Sportster 560 */
523 {0x30307256, NULL
}, /* USR3030 - U.S. Robotics 56K FAX INT */
524 {0x31307256, NULL
}, /* USR3031 - U.S. Robotics 56K FAX INT */
525 {0x50307256, NULL
}, /* USR3050 - U.S. Robotics 56K FAX INT */
526 {0x70307256, NULL
}, /* USR3070 - U.S. Robotics 56K Voice INT */
527 {0x90307256, NULL
}, /* USR3090 - USR ? */
528 {0x70917256, NULL
}, /* USR9170 - U.S. Robotics 56K FAX INT */
529 {0x90917256, NULL
}, /* USR9190 - USR 56k Voice INT */
530 {0x0300695c, NULL
}, /* WCI0003 - Fax/Voice/Modem/Speakphone/Asvd */
531 {0x01a0896a, NULL
}, /* ZTIA001 - Zoom Internal V90 Faxmodem */
532 {0x61f7896a, NULL
}, /* ZTIF761 - Zoom ComStar 33.6 */
539 sio_isa_probe(device_t dev
)
541 /* Check isapnp ids */
542 if (ISA_PNP_PROBE(device_get_parent(dev
), dev
, sio_ids
) == ENXIO
)
544 return (sioprobe(dev
, 0, 0UL));
548 sioprobe(device_t dev
, int xrid
, u_long rclk
)
551 static bool_t already_init
;
560 intrmask_t irqmap
[4];
565 u_int flags
= device_get_flags(dev
);
567 struct resource
*port
;
570 port
= bus_alloc_resource(dev
, SYS_RES_IOPORT
, &rid
,
571 0, ~0, IO_COMSIZE
, RF_ACTIVE
);
575 lwkt_gettoken(&tty_token
);
576 com
= device_get_softc(dev
);
577 com
->bst
= rman_get_bustag(port
);
578 com
->bsh
= rman_get_bushandle(port
);
585 * XXX this is broken - when we are first called, there are no
586 * previously configured IO ports. We could hard code
587 * 0x3f8, 0x2f8, 0x3e8, 0x2e8 etc but that's probably worse.
588 * This code has been doing nothing since the conversion since
589 * "count" is zero the first time around.
593 * Turn off MCR_IENABLE for all likely serial ports. An unused
594 * port with its MCR_IENABLE gate open will inhibit interrupts
595 * from any used port that shares the interrupt vector.
596 * XXX the gate enable is elsewhere for some multiports.
599 int count
, i
, xioport
;
601 devclass_get_devices(sio_devclass
, &devs
, &count
);
602 for (i
= 0; i
< count
; i
++) {
604 if (device_is_enabled(xdev
) &&
605 bus_get_resource(xdev
, SYS_RES_IOPORT
, 0, &xioport
,
607 outb(xioport
+ com_mcr
, 0);
614 if (COM_LLCONSOLE(flags
)) {
615 kprintf("sio%d: reserved for low-level i/o\n",
616 device_get_unit(dev
));
617 bus_release_resource(dev
, SYS_RES_IOPORT
, rid
, port
);
618 lwkt_reltoken(&tty_token
);
623 * If the device is on a multiport card and has an AST/4
624 * compatible interrupt control register, initialize this
625 * register and prepare to leave MCR_IENABLE clear in the mcr.
626 * Otherwise, prepare to set MCR_IENABLE in the mcr.
627 * Point idev to the device struct giving the correct id_irq.
628 * This is the struct for the master device if there is one.
631 mcr_image
= MCR_IENABLE
;
633 if (COM_ISMULTIPORT(flags
)) {
637 idev
= devclass_get_device(sio_devclass
, COM_MPMASTER(flags
));
639 kprintf("sio%d: master device %d not configured\n",
640 device_get_unit(dev
), COM_MPMASTER(flags
));
643 if (!COM_NOTAST4(flags
)) {
644 if (bus_get_resource(idev
, SYS_RES_IOPORT
, 0, &io
,
647 if (bus_get_resource(idev
, SYS_RES_IRQ
, 0,
649 outb(xiobase
+ com_scr
, 0x80);
651 outb(xiobase
+ com_scr
, 0);
656 #endif /* COM_MULTIPORT */
657 if (bus_get_resource(idev
, SYS_RES_IRQ
, 0, NULL
, NULL
) != 0)
660 bzero(failures
, sizeof failures
);
661 iobase
= rman_get_start(port
);
664 * We don't want to get actual interrupts, just masked ones.
665 * Interrupts from this line should already be masked in the ICU,
666 * but mask them in the processor as well in case there are some
667 * (misconfigured) shared interrupts.
673 * For the TI16754 chips, set prescaler to 1 (4 is often the
674 * default after-reset value) as otherwise it's impossible to
675 * get highest baudrates.
677 if (COM_TI16754(flags
)) {
680 cfcr
= sio_getreg(com
, com_cfcr
);
681 sio_setreg(com
, com_cfcr
, CFCR_EFR_ENABLE
);
682 efr
= sio_getreg(com
, com_efr
);
683 /* Unlock extended features to turn off prescaler. */
684 sio_setreg(com
, com_efr
, efr
| EFR_EFE
);
686 sio_setreg(com
, com_cfcr
, (cfcr
!= CFCR_EFR_ENABLE
) ? cfcr
: 0);
687 /* Turn off prescaler. */
688 sio_setreg(com
, com_mcr
,
689 sio_getreg(com
, com_mcr
) & ~MCR_PRESCALE
);
690 sio_setreg(com
, com_cfcr
, CFCR_EFR_ENABLE
);
691 sio_setreg(com
, com_efr
, efr
);
692 sio_setreg(com
, com_cfcr
, cfcr
);
696 * Initialize the speed and the word size and wait long enough to
697 * drain the maximum of 16 bytes of junk in device output queues.
698 * The speed is undefined after a master reset and must be set
699 * before relying on anything related to output. There may be
700 * junk after a (very fast) soft reboot and (apparently) after
702 * XXX what about the UART bug avoided by waiting in comparam()?
703 * We don't want to to wait long enough to drain at 2 bps.
705 if (iobase
== siocniobase
) {
706 DELAY((16 + 1) * 1000000 / (comdefaultrate
/ 10));
708 sio_setreg(com
, com_cfcr
, CFCR_DLAB
| CFCR_8BITS
);
709 divisor
= siodivisor(rclk
, SIO_TEST_SPEED
);
710 sio_setreg(com
, com_dlbl
, divisor
& 0xff);
711 sio_setreg(com
, com_dlbh
, divisor
>> 8);
712 sio_setreg(com
, com_cfcr
, CFCR_8BITS
);
713 DELAY((16 + 1) * 1000000 / (SIO_TEST_SPEED
/ 10));
717 * Make sure we can drain the receiver. If we can't, the serial
718 * port may not exist.
720 for (fn
= 0; fn
< 256; ++fn
) {
721 if ((sio_getreg(com
, com_lsr
) & LSR_RXRDY
) == 0)
723 (void)sio_getreg(com
, com_data
);
727 lwkt_reltoken(&tty_token
);
728 kprintf("sio%d: can't drain, serial port might "
729 "not exist, disabling\n", device_get_unit(dev
));
734 * Enable the interrupt gate and disable device interupts. This
735 * should leave the device driving the interrupt line low and
736 * guarantee an edge trigger if an interrupt can be generated.
739 sio_setreg(com
, com_mcr
, mcr_image
);
740 sio_setreg(com
, com_ier
, 0);
741 DELAY(1000); /* XXX */
742 irqmap
[0] = isa_irq_pending();
745 * Attempt to set loopback mode so that we can send a null byte
746 * without annoying any external device.
749 sio_setreg(com
, com_mcr
, mcr_image
| MCR_LOOPBACK
);
752 * Attempt to generate an output interrupt. On 8250's, setting
753 * IER_ETXRDY generates an interrupt independent of the current
754 * setting and independent of whether the THR is empty. On 16450's,
755 * setting IER_ETXRDY generates an interrupt independent of the
756 * current setting. On 16550A's, setting IER_ETXRDY only
757 * generates an interrupt when IER_ETXRDY is not already set.
759 sio_setreg(com
, com_ier
, IER_ETXRDY
);
762 * On some 16x50 incompatibles, setting IER_ETXRDY doesn't generate
763 * an interrupt. They'd better generate one for actually doing
764 * output. Loopback may be broken on the same incompatibles but
765 * it's unlikely to do more than allow the null byte out.
767 sio_setreg(com
, com_data
, 0);
768 DELAY((1 + 2) * 1000000 / (SIO_TEST_SPEED
/ 10));
771 * Turn off loopback mode so that the interrupt gate works again
772 * (MCR_IENABLE was hidden). This should leave the device driving
773 * an interrupt line high. It doesn't matter if the interrupt
774 * line oscillates while we are not looking at it, since interrupts
778 sio_setreg(com
, com_mcr
, mcr_image
);
781 * Some pcmcia cards have the "TXRDY bug", so we check everyone
782 * for IIR_TXRDY implementation ( Palido 321s, DC-1S... )
784 if (COM_NOPROBE(flags
)) {
785 /* Reading IIR register twice */
786 for (fn
= 0; fn
< 2; fn
++) {
788 failures
[6] = sio_getreg(com
, com_iir
);
790 /* Check IIR_TXRDY clear ? */
792 if (failures
[6] & IIR_TXRDY
) {
793 /* Nop, Double check with clearing IER */
794 sio_setreg(com
, com_ier
, 0);
795 if (sio_getreg(com
, com_iir
) & IIR_NOPEND
) {
796 /* Ok. we're familia this gang */
797 SET_FLAG(dev
, COM_C_IIR_TXRDYBUG
);
799 /* Unknown, Just omit this chip.. XXX */
801 sio_setreg(com
, com_mcr
, 0);
804 /* OK. this is well-known guys */
805 CLR_FLAG(dev
, COM_C_IIR_TXRDYBUG
);
807 sio_setreg(com
, com_ier
, 0);
808 sio_setreg(com
, com_cfcr
, CFCR_8BITS
);
810 bus_release_resource(dev
, SYS_RES_IOPORT
, rid
, port
);
811 lwkt_reltoken(&tty_token
);
812 return (iobase
== siocniobase
? 0 : result
);
817 * o the CFCR, IER and MCR in UART hold the values written to them
818 * (the values happen to be all distinct - this is good for
819 * avoiding false positive tests from bus echoes).
820 * o an output interrupt is generated and its vector is correct.
821 * o the interrupt goes away when the IIR in the UART is read.
824 failures
[0] = sio_getreg(com
, com_cfcr
) - CFCR_8BITS
;
825 failures
[1] = sio_getreg(com
, com_ier
) - IER_ETXRDY
;
826 failures
[2] = sio_getreg(com
, com_mcr
) - mcr_image
;
827 DELAY(10000); /* Some internal modems need this time */
828 irqmap
[1] = isa_irq_pending();
829 failures
[4] = (sio_getreg(com
, com_iir
) & IIR_IMASK
) - IIR_TXRDY
;
830 DELAY(1000); /* XXX */
831 irqmap
[2] = isa_irq_pending();
832 failures
[6] = (sio_getreg(com
, com_iir
) & IIR_IMASK
) - IIR_NOPEND
;
835 * Turn off all device interrupts and check that they go off properly.
836 * Leave MCR_IENABLE alone. For ports without a master port, it gates
837 * the OUT2 output of the UART to
838 * the ICU input. Closing the gate would give a floating ICU input
839 * (unless there is another device driving it) and spurious interrupts.
840 * (On the system that this was first tested on, the input floats high
841 * and gives a (masked) interrupt as soon as the gate is closed.)
843 sio_setreg(com
, com_ier
, 0);
844 sio_setreg(com
, com_cfcr
, CFCR_8BITS
); /* dummy to avoid bus echo */
845 failures
[7] = sio_getreg(com
, com_ier
);
846 DELAY(1000); /* XXX */
847 irqmap
[3] = isa_irq_pending();
848 failures
[9] = (sio_getreg(com
, com_iir
) & IIR_IMASK
) - IIR_NOPEND
;
852 irqs
= irqmap
[1] & ~irqmap
[0];
853 if (bus_get_resource(idev
, SYS_RES_IRQ
, 0, &xirq
, NULL
) == 0 &&
854 ((1 << xirq
) & irqs
) == 0)
856 "sio%d: configured irq %ld not in bitmap of probed irqs %#x\n",
857 device_get_unit(dev
), xirq
, irqs
);
859 kprintf("sio%d: irq maps: %#x %#x %#x %#x\n",
860 device_get_unit(dev
),
861 irqmap
[0], irqmap
[1], irqmap
[2], irqmap
[3]);
864 for (fn
= 0; fn
< sizeof failures
; ++fn
)
866 sio_setreg(com
, com_mcr
, 0);
869 kprintf("sio%d: probe failed test(s):",
870 device_get_unit(dev
));
871 for (fn
= 0; fn
< sizeof failures
; ++fn
)
878 bus_release_resource(dev
, SYS_RES_IOPORT
, rid
, port
);
879 lwkt_reltoken(&tty_token
);
880 return (iobase
== siocniobase
? 0 : result
);
885 espattach(struct com_s
*com
, Port_t esp_port
)
891 * Check the ESP-specific I/O port to see if we're an ESP
892 * card. If not, return failure immediately.
894 if ((inb(esp_port
) & 0xf3) == 0) {
895 kprintf(" port 0x%x is not an ESP board?\n", esp_port
);
899 lwkt_gettoken(&tty_token
);
901 * We've got something that claims to be a Hayes ESP card.
905 /* Get the dip-switch configuration */
906 outb(esp_port
+ ESP_CMD1
, ESP_GETDIPS
);
907 dips
= inb(esp_port
+ ESP_STATUS1
);
910 * Bits 0,1 of dips say which COM port we are.
912 if (rman_get_start(com
->ioportres
) == likely_com_ports
[dips
& 0x03])
915 kprintf(" esp_port has com %d\n", dips
& 0x03);
916 lwkt_reltoken(&tty_token
);
921 * Check for ESP version 2.0 or later: bits 4,5,6 = 010.
923 outb(esp_port
+ ESP_CMD1
, ESP_GETTEST
);
924 val
= inb(esp_port
+ ESP_STATUS1
); /* clear reg 1 */
925 val
= inb(esp_port
+ ESP_STATUS2
);
926 if ((val
& 0x70) < 0x20) {
927 kprintf("-old (%o)", val
& 0x70);
928 lwkt_reltoken(&tty_token
);
933 * Check for ability to emulate 16550: bit 7 == 1
935 if ((dips
& 0x80) == 0) {
937 lwkt_reltoken(&tty_token
);
942 * Okay, we seem to be a Hayes ESP card. Whee.
945 com
->esp_port
= esp_port
;
946 lwkt_reltoken(&tty_token
);
952 sio_isa_attach(device_t dev
)
954 return (sioattach(dev
, 0, 0UL));
958 sioattach(device_t dev
, int xrid
, u_long rclk
)
969 struct resource
*port
;
973 lwkt_gettoken(&tty_token
);
976 callout_init_mp(&sio_timeout_handle
);
980 port
= bus_alloc_resource(dev
, SYS_RES_IOPORT
, &rid
,
981 0, ~0, IO_COMSIZE
, RF_ACTIVE
);
983 lwkt_reltoken(&tty_token
);
987 iobase
= rman_get_start(port
);
988 unit
= device_get_unit(dev
);
989 com
= device_get_softc(dev
);
990 flags
= device_get_flags(dev
);
992 if (unit
>= sio_numunits
)
993 sio_numunits
= unit
+ 1;
995 * sioprobe() has initialized the device registers as follows:
996 * o cfcr = CFCR_8BITS.
997 * It is most important that CFCR_DLAB is off, so that the
998 * data port is not hidden when we enable interrupts.
1000 * Interrupts are only enabled when the line is open.
1001 * o mcr = MCR_IENABLE, or 0 if the port has AST/4 compatible
1002 * interrupt control register or the config specifies no irq.
1003 * Keeping MCR_DTR and MCR_RTS off might stop the external
1004 * device from sending before we are ready.
1006 bzero(com
, sizeof *com
);
1008 com
->ioportres
= port
;
1009 com
->bst
= rman_get_bustag(port
);
1010 com
->bsh
= rman_get_bushandle(port
);
1011 com
->cfcr_image
= CFCR_8BITS
;
1012 com
->dtr_wait
= 3 * hz
;
1013 callout_init_mp(&com
->dtr_ch
);
1014 callout_init_mp(&com
->busy_ch
);
1015 com
->loses_outints
= COM_LOSESOUTINTS(flags
) != 0;
1016 com
->no_irq
= bus_get_resource(dev
, SYS_RES_IRQ
, 0, NULL
, NULL
) != 0;
1017 com
->tx_fifo_size
= 1;
1018 com
->obufs
[0].l_head
= com
->obuf1
;
1019 com
->obufs
[1].l_head
= com
->obuf2
;
1021 com
->data_port
= iobase
+ com_data
;
1022 com
->int_id_port
= iobase
+ com_iir
;
1023 com
->modem_ctl_port
= iobase
+ com_mcr
;
1024 com
->mcr_image
= inb(com
->modem_ctl_port
);
1025 com
->line_status_port
= iobase
+ com_lsr
;
1026 com
->modem_status_port
= iobase
+ com_msr
;
1027 com
->intr_ctl_port
= iobase
+ com_ier
;
1030 rclk
= DEFAULT_RCLK
;
1034 * We don't use all the flags from <sys/ttydefaults.h> since they
1035 * are only relevant for logins. It's important to have echo off
1036 * initially so that the line doesn't start blathering before the
1037 * echo flag can be turned off.
1039 com
->it_in
.c_iflag
= 0;
1040 com
->it_in
.c_oflag
= 0;
1041 com
->it_in
.c_cflag
= TTYDEF_CFLAG
;
1042 com
->it_in
.c_lflag
= 0;
1043 if (unit
== comconsole
) {
1044 com
->it_in
.c_iflag
= TTYDEF_IFLAG
;
1045 com
->it_in
.c_oflag
= TTYDEF_OFLAG
;
1046 com
->it_in
.c_cflag
= TTYDEF_CFLAG
| CLOCAL
;
1047 com
->it_in
.c_lflag
= TTYDEF_LFLAG
;
1048 com
->lt_out
.c_cflag
= com
->lt_in
.c_cflag
= CLOCAL
;
1049 com
->lt_out
.c_ispeed
= com
->lt_out
.c_ospeed
=
1050 com
->lt_in
.c_ispeed
= com
->lt_in
.c_ospeed
=
1051 com
->it_in
.c_ispeed
= com
->it_in
.c_ospeed
= comdefaultrate
;
1053 com
->it_in
.c_ispeed
= com
->it_in
.c_ospeed
= TTYDEF_SPEED
;
1054 if (siosetwater(com
, com
->it_in
.c_ispeed
) != 0) {
1056 * Leave i/o resources allocated if this is a `cn'-level
1057 * console, so that other devices can't snarf them.
1059 if (iobase
!= siocniobase
)
1060 bus_release_resource(dev
, SYS_RES_IOPORT
, rid
, port
);
1061 lwkt_reltoken(&tty_token
);
1064 termioschars(&com
->it_in
);
1065 com
->it_out
= com
->it_in
;
1067 /* attempt to determine UART type */
1068 kprintf("sio%d: type", unit
);
1071 #ifdef COM_MULTIPORT
1072 if (!COM_ISMULTIPORT(flags
) && !COM_IIR_TXRDYBUG(flags
))
1074 if (!COM_IIR_TXRDYBUG(flags
))
1081 scr
= sio_getreg(com
, com_scr
);
1082 sio_setreg(com
, com_scr
, 0xa5);
1083 scr1
= sio_getreg(com
, com_scr
);
1084 sio_setreg(com
, com_scr
, 0x5a);
1085 scr2
= sio_getreg(com
, com_scr
);
1086 sio_setreg(com
, com_scr
, scr
);
1087 if (scr1
!= 0xa5 || scr2
!= 0x5a) {
1089 goto determined_type
;
1092 sio_setreg(com
, com_fifo
, FIFO_ENABLE
| FIFO_RX_HIGH
);
1095 switch (inb(com
->int_id_port
) & IIR_FIFO_MASK
) {
1106 if (COM_NOFIFO(flags
)) {
1107 kprintf(" 16550A fifo disabled");
1109 com
->hasfifo
= TRUE
;
1110 if (COM_ST16650A(flags
)) {
1112 com
->tx_fifo_size
= 32;
1113 kprintf(" ST16650A");
1114 } else if (COM_TI16754(flags
)) {
1115 com
->tx_fifo_size
= 64;
1116 kprintf(" TI16754");
1118 com
->tx_fifo_size
= COM_FIFOSIZE(flags
);
1123 for (espp
= likely_esp_ports
; *espp
!= 0; espp
++)
1124 if (espattach(com
, *espp
)) {
1125 com
->tx_fifo_size
= 1024;
1129 if (!com
->st16650a
&& !COM_TI16754(flags
)) {
1130 if (!com
->tx_fifo_size
)
1131 com
->tx_fifo_size
= 16;
1133 kprintf(" lookalike with %d bytes FIFO",
1143 * Set 16550 compatibility mode.
1144 * We don't use the ESP_MODE_SCALE bit to increase the
1145 * fifo trigger levels because we can't handle large
1147 * XXX flow control should be set in comparam(), not here.
1149 outb(com
->esp_port
+ ESP_CMD1
, ESP_SETMODE
);
1150 outb(com
->esp_port
+ ESP_CMD2
, ESP_MODE_RTS
| ESP_MODE_FIFO
);
1152 /* Set RTS/CTS flow control. */
1153 outb(com
->esp_port
+ ESP_CMD1
, ESP_SETFLOWTYPE
);
1154 outb(com
->esp_port
+ ESP_CMD2
, ESP_FLOW_RTS
);
1155 outb(com
->esp_port
+ ESP_CMD2
, ESP_FLOW_CTS
);
1157 /* Set flow-control levels. */
1158 outb(com
->esp_port
+ ESP_CMD1
, ESP_SETRXFLOW
);
1159 outb(com
->esp_port
+ ESP_CMD2
, HIBYTE(768));
1160 outb(com
->esp_port
+ ESP_CMD2
, LOBYTE(768));
1161 outb(com
->esp_port
+ ESP_CMD2
, HIBYTE(512));
1162 outb(com
->esp_port
+ ESP_CMD2
, LOBYTE(512));
1164 #endif /* COM_ESP */
1165 sio_setreg(com
, com_fifo
, 0);
1168 #ifdef COM_MULTIPORT
1169 if (COM_ISMULTIPORT(flags
)) {
1172 com
->multiport
= TRUE
;
1173 kprintf(" (multiport");
1174 if (unit
== COM_MPMASTER(flags
))
1177 masterdev
= devclass_get_device(sio_devclass
,
1178 COM_MPMASTER(flags
));
1179 com
->no_irq
= (masterdev
== NULL
|| bus_get_resource(masterdev
,
1180 SYS_RES_IRQ
, 0, NULL
, NULL
) != 0);
1182 #endif /* COM_MULTIPORT */
1183 if (unit
== comconsole
)
1184 kprintf(", console");
1185 if (COM_IIR_TXRDYBUG(flags
))
1186 kprintf(" with a bogus IIR_TXRDY register");
1189 if (!sio_registered
) {
1190 register_swi(SWI_TTY
, siopoll
, NULL
,"swi_siopoll", NULL
, -1);
1191 sio_registered
= TRUE
;
1193 minorbase
= UNIT_TO_MINOR(unit
);
1194 make_dev(&sio_ops
, minorbase
,
1195 UID_ROOT
, GID_WHEEL
, 0600, "ttyd%r", unit
);
1196 make_dev(&sio_ops
, minorbase
| CONTROL_INIT_STATE
,
1197 UID_ROOT
, GID_WHEEL
, 0600, "ttyid%r", unit
);
1198 make_dev(&sio_ops
, minorbase
| CONTROL_LOCK_STATE
,
1199 UID_ROOT
, GID_WHEEL
, 0600, "ttyld%r", unit
);
1200 make_dev(&sio_ops
, minorbase
| CALLOUT_MASK
,
1201 UID_UUCP
, GID_DIALER
, 0660, "cuaa%r", unit
);
1202 make_dev(&sio_ops
, minorbase
| CALLOUT_MASK
| CONTROL_INIT_STATE
,
1203 UID_UUCP
, GID_DIALER
, 0660, "cuaia%r", unit
);
1204 make_dev(&sio_ops
, minorbase
| CALLOUT_MASK
| CONTROL_LOCK_STATE
,
1205 UID_UUCP
, GID_DIALER
, 0660, "cuala%r", unit
);
1207 com
->pps
.ppscap
= PPS_CAPTUREASSERT
| PPS_CAPTURECLEAR
;
1208 pps_init(&com
->pps
);
1211 com
->irqres
= bus_alloc_resource(dev
, SYS_RES_IRQ
, &rid
, 0ul, ~0ul, 1,
1214 ret
= BUS_SETUP_INTR(device_get_parent(dev
), dev
,
1215 com
->irqres
, INTR_MPSAFE
, siointr
, com
,
1216 &com
->cookie
, NULL
, NULL
);
1218 device_printf(dev
, "could not activate interrupt\n");
1221 * Enable interrupts for early break-to-debugger support
1224 if (ret
== 0 && unit
== comconsole
&&
1225 (break_to_debugger
|| alt_break_to_debugger
)) {
1226 inb(siocniobase
+ com_data
);
1227 outb(siocniobase
+ com_ier
,
1228 IER_ERXRDY
| IER_ERLS
| IER_EMSC
);
1233 lwkt_reltoken(&tty_token
);
1238 sioopen(struct dev_open_args
*ap
)
1240 cdev_t dev
= ap
->a_head
.a_dev
;
1248 unit
= MINOR_TO_UNIT(mynor
);
1249 com
= com_addr(unit
);
1254 if (mynor
& CONTROL_MASK
)
1256 lwkt_gettoken(&tty_token
);
1257 tp
= dev
->si_tty
= com
->tp
= ttymalloc(com
->tp
);
1260 * We jump to this label after all non-interrupted sleeps to pick
1261 * up any changes of the device state.
1264 while (com
->state
& CS_DTR_OFF
) {
1265 error
= tsleep(&com
->dtr_wait
, PCATCH
, "siodtr", 0);
1266 if (com_addr(unit
) == NULL
) {
1268 lwkt_reltoken(&tty_token
);
1271 if (error
!= 0 || com
->gone
)
1274 if (tp
->t_state
& TS_ISOPEN
) {
1276 * The device is open, so everything has been initialized.
1279 if (mynor
& CALLOUT_MASK
) {
1280 if (!com
->active_out
) {
1285 if (com
->active_out
) {
1286 if (ap
->a_oflags
& O_NONBLOCK
) {
1290 error
= tsleep(&com
->active_out
,
1291 PCATCH
, "siobi", 0);
1292 if (com_addr(unit
) == NULL
) {
1294 lwkt_reltoken(&tty_token
);
1297 if (error
!= 0 || com
->gone
)
1302 if (tp
->t_state
& TS_XCLUDE
&& priv_check_cred(ap
->a_cred
, PRIV_ROOT
, 0)) {
1308 * The device isn't open, so there are no conflicts.
1309 * Initialize it. Initialization is done twice in many
1310 * cases: to preempt sleeping callin opens if we are
1311 * callout, and to complete a callin open after DCD rises.
1313 tp
->t_oproc
= comstart
;
1314 tp
->t_param
= comparam
;
1315 tp
->t_stop
= comstop
;
1317 tp
->t_termios
= mynor
& CALLOUT_MASK
1318 ? com
->it_out
: com
->it_in
;
1319 (void)commctl(com
, TIOCM_DTR
| TIOCM_RTS
, DMSET
);
1320 com
->poll
= com
->no_irq
;
1321 com
->poll_output
= com
->loses_outints
;
1323 error
= comparam(tp
, &tp
->t_termios
);
1328 * XXX we should goto open_top if comparam() slept.
1332 * (Re)enable and drain fifos.
1334 * Certain SMC chips cause problems if the fifos
1335 * are enabled while input is ready. Turn off the
1336 * fifo if necessary to clear the input. We test
1337 * the input ready bit after enabling the fifos
1338 * since we've already enabled them in comparam()
1339 * and to handle races between enabling and fresh
1343 sio_setreg(com
, com_fifo
,
1344 FIFO_RCV_RST
| FIFO_XMT_RST
1347 * XXX the delays are for superstitious
1348 * historical reasons. It must be less than
1349 * the character time at the maximum
1350 * supported speed (87 usec at 115200 bps
1351 * 8N1). Otherwise we might loop endlessly
1352 * if data is streaming in. We used to use
1353 * delays of 100. That usually worked
1354 * because DELAY(100) used to usually delay
1355 * for about 85 usec instead of 100.
1358 if (!(inb(com
->line_status_port
) & LSR_RXRDY
))
1360 sio_setreg(com
, com_fifo
, 0);
1362 (void) inb(com
->data_port
);
1367 (void) inb(com
->line_status_port
);
1368 (void) inb(com
->data_port
);
1369 com
->prev_modem_status
= com
->last_modem_status
1370 = inb(com
->modem_status_port
);
1371 if (COM_IIR_TXRDYBUG(com
->flags
)) {
1372 outb(com
->intr_ctl_port
, IER_ERXRDY
| IER_ERLS
1375 outb(com
->intr_ctl_port
, IER_ERXRDY
| IER_ETXRDY
1376 | IER_ERLS
| IER_EMSC
);
1380 * Handle initial DCD. Callout devices get a fake initial
1381 * DCD (trapdoor DCD). If we are callout, then any sleeping
1382 * callin opens get woken up and resume sleeping on "siobi"
1383 * instead of "siodcd".
1386 * XXX `mynor & CALLOUT_MASK' should be
1387 * `tp->t_cflag & (SOFT_CARRIER | TRAPDOOR_CARRIER) where
1388 * TRAPDOOR_CARRIER is the default initial state for callout
1389 * devices and SOFT_CARRIER is like CLOCAL except it hides
1392 if (com
->prev_modem_status
& MSR_DCD
|| mynor
& CALLOUT_MASK
)
1393 (*linesw
[tp
->t_line
].l_modem
)(tp
, 1);
1396 * Wait for DCD if necessary.
1398 if (!(tp
->t_state
& TS_CARR_ON
) && !(mynor
& CALLOUT_MASK
)
1399 && !(tp
->t_cflag
& CLOCAL
) && !(ap
->a_oflags
& O_NONBLOCK
)) {
1401 error
= tsleep(TSA_CARR_ON(tp
), PCATCH
, "siodcd", 0);
1402 if (com_addr(unit
) == NULL
) {
1404 lwkt_reltoken(&tty_token
);
1408 if (error
!= 0 || com
->gone
)
1412 error
= (*linesw
[tp
->t_line
].l_open
)(dev
, tp
);
1413 disc_optim(tp
, &tp
->t_termios
, com
);
1414 if (tp
->t_state
& TS_ISOPEN
&& mynor
& CALLOUT_MASK
)
1415 com
->active_out
= TRUE
;
1419 if (!(tp
->t_state
& TS_ISOPEN
) && com
->wopeners
== 0)
1421 lwkt_reltoken(&tty_token
);
1426 sioclose(struct dev_close_args
*ap
)
1428 cdev_t dev
= ap
->a_head
.a_dev
;
1434 if (mynor
& CONTROL_MASK
)
1436 lwkt_gettoken(&tty_token
);
1437 com
= com_addr(MINOR_TO_UNIT(mynor
));
1439 lwkt_reltoken(&tty_token
);
1444 (*linesw
[tp
->t_line
].l_close
)(tp
, ap
->a_fflag
);
1445 disc_optim(tp
, &tp
->t_termios
, com
);
1446 comstop(tp
, FREAD
| FWRITE
);
1452 kprintf("sio%d: gone\n", com
->unit
);
1454 if (com
->ibuf
!= NULL
)
1455 kfree(com
->ibuf
, M_DEVBUF
);
1456 bzero(tp
, sizeof *tp
);
1459 lwkt_reltoken(&tty_token
);
1464 comhardclose(struct com_s
*com
)
1468 lwkt_gettoken(&tty_token
);
1470 com
->poll_output
= FALSE
;
1471 com
->do_timestamp
= FALSE
;
1472 com
->do_dcd_timestamp
= FALSE
;
1473 com
->pps
.ppsparam
.mode
= 0;
1474 sio_setreg(com
, com_cfcr
, com
->cfcr_image
&= ~CFCR_SBREAK
);
1479 * Leave interrupts enabled and don't clear DTR if this is the
1480 * console. This allows us to detect break-to-debugger events
1481 * while the console device is closed.
1483 if (com
->unit
!= comconsole
||
1484 (break_to_debugger
== 0 && alt_break_to_debugger
== 0))
1487 sio_setreg(com
, com_ier
, 0);
1488 if (tp
->t_cflag
& HUPCL
1490 * XXX we will miss any carrier drop between here and the
1491 * next open. Perhaps we should watch DCD even when the
1492 * port is closed; it is not sufficient to check it at
1493 * the next open because it might go up and down while
1494 * we're not watching.
1496 || (!com
->active_out
1497 && !(com
->prev_modem_status
& MSR_DCD
)
1498 && !(com
->it_in
.c_cflag
& CLOCAL
))
1499 || !(tp
->t_state
& TS_ISOPEN
)) {
1500 (void)commctl(com
, TIOCM_DTR
, DMBIC
);
1501 if (com
->dtr_wait
!= 0 && !(com
->state
& CS_DTR_OFF
)) {
1502 callout_reset(&com
->dtr_ch
, com
->dtr_wait
,
1504 com
->state
|= CS_DTR_OFF
;
1510 * Disable fifos so that they are off after controlled
1511 * reboots. Some BIOSes fail to detect 16550s when the
1512 * fifos are enabled.
1514 sio_setreg(com
, com_fifo
, 0);
1516 com
->active_out
= FALSE
;
1517 wakeup(&com
->active_out
);
1518 wakeup(TSA_CARR_ON(tp
)); /* restart any wopeners */
1519 lwkt_reltoken(&tty_token
);
1524 sioread(struct dev_read_args
*ap
)
1526 cdev_t dev
= ap
->a_head
.a_dev
;
1530 lwkt_gettoken(&tty_token
);
1532 if (mynor
& CONTROL_MASK
) {
1533 lwkt_reltoken(&tty_token
);
1536 com
= com_addr(MINOR_TO_UNIT(mynor
));
1537 if (com
== NULL
|| com
->gone
) {
1538 lwkt_reltoken(&tty_token
);
1541 ret
= ((*linesw
[com
->tp
->t_line
].l_read
)(com
->tp
, ap
->a_uio
, ap
->a_ioflag
));
1542 lwkt_reltoken(&tty_token
);
1547 siowrite(struct dev_write_args
*ap
)
1549 cdev_t dev
= ap
->a_head
.a_dev
;
1554 lwkt_gettoken(&tty_token
);
1556 if (mynor
& CONTROL_MASK
) {
1557 lwkt_reltoken(&tty_token
);
1561 unit
= MINOR_TO_UNIT(mynor
);
1562 com
= com_addr(unit
);
1563 if (com
== NULL
|| com
->gone
) {
1564 lwkt_reltoken(&tty_token
);
1568 * (XXX) We disallow virtual consoles if the physical console is
1569 * a serial port. This is in case there is a display attached that
1570 * is not the console. In that situation we don't need/want the X
1571 * server taking over the console.
1573 if (constty
!= NULL
&& unit
== comconsole
)
1575 ret
= ((*linesw
[com
->tp
->t_line
].l_write
)(com
->tp
, ap
->a_uio
, ap
->a_ioflag
));
1576 lwkt_reltoken(&tty_token
);
1581 siobusycheck(void *chan
)
1585 lwkt_gettoken(&tty_token
);
1586 com
= (struct com_s
*)chan
;
1589 * Clear TS_BUSY if low-level output is complete.
1590 * spl locking is sufficient because siointr1() does not set CS_BUSY.
1591 * If siointr1() clears CS_BUSY after we look at it, then we'll get
1592 * called again. Reading the line status port outside of siointr1()
1593 * is safe because CS_BUSY is clear so there are no output interrupts
1597 if (com
->state
& CS_BUSY
)
1598 com
->extra_state
&= ~CSE_BUSYCHECK
; /* False alarm. */
1599 else if ((inb(com
->line_status_port
) & (LSR_TSRE
| LSR_TXRDY
))
1600 == (LSR_TSRE
| LSR_TXRDY
)) {
1601 com
->tp
->t_state
&= ~TS_BUSY
;
1603 com
->extra_state
&= ~CSE_BUSYCHECK
;
1605 callout_reset(&com
->busy_ch
, hz
/ 100, siobusycheck
, com
);
1608 lwkt_reltoken(&tty_token
);
1612 siodivisor(u_long rclk
, speed_t speed
)
1618 if (speed
== 0 || speed
> ((speed_t
)-1 - 1) / 8)
1620 divisor
= (rclk
/ (8UL * speed
) + 1) / 2;
1621 if (divisor
== 0 || divisor
>= 65536)
1623 actual_speed
= rclk
/ (16UL * divisor
);
1625 /* 10 times error in percent: */
1626 error
= ((actual_speed
- (long)speed
) * 2000 / (long)speed
+ 1) / 2;
1628 /* 3.0% maximum error tolerance: */
1629 if (error
< -30 || error
> 30)
1636 siodtrwakeup(void *chan
)
1640 lwkt_gettoken(&tty_token
);
1641 com
= (struct com_s
*)chan
;
1642 com
->state
&= ~CS_DTR_OFF
;
1643 wakeup(&com
->dtr_wait
);
1644 lwkt_reltoken(&tty_token
);
1648 * NOTE: Normally called with tty_token held but might not be when
1649 * operating as the console.
1651 * Must be called with com_lock
1654 sioinput(struct com_s
*com
)
1664 if (!(tp
->t_state
& TS_ISOPEN
) || !(tp
->t_cflag
& CREAD
)) {
1665 com_events
-= (com
->iptr
- com
->ibuf
);
1666 com
->iptr
= com
->ibuf
;
1669 if (tp
->t_state
& TS_CAN_BYPASS_L_RINT
) {
1671 * Avoid the grotesquely inefficient lineswitch routine
1672 * (ttyinput) in "raw" mode. It usually takes about 450
1673 * instructions (that's without canonical processing or echo!).
1674 * slinput is reasonably fast (usually 40 instructions plus
1679 incc
= com
->iptr
- buf
;
1680 if (tp
->t_rawq
.c_cc
+ incc
> tp
->t_ihiwat
1681 && (com
->state
& CS_RTS_IFLOW
1682 || tp
->t_iflag
& IXOFF
)
1683 && !(tp
->t_state
& TS_TBLOCK
))
1685 com
->delta_error_counts
[CE_TTY_BUF_OVERFLOW
]
1686 += b_to_q((char *)buf
, incc
, &tp
->t_rawq
);
1690 tp
->t_rawcc
+= incc
;
1692 if (tp
->t_state
& TS_TTSTOP
1693 && (tp
->t_iflag
& IXANY
1694 || tp
->t_cc
[VSTART
] == tp
->t_cc
[VSTOP
])) {
1695 tp
->t_state
&= ~TS_TTSTOP
;
1696 tp
->t_lflag
&= ~FLUSHO
;
1700 } while (buf
< com
->iptr
);
1704 line_status
= buf
[com
->ierroff
];
1707 & (LSR_BI
| LSR_FE
| LSR_OE
| LSR_PE
)) {
1708 if (line_status
& LSR_BI
)
1709 recv_data
|= TTY_BI
;
1710 if (line_status
& LSR_FE
)
1711 recv_data
|= TTY_FE
;
1712 if (line_status
& LSR_OE
)
1713 recv_data
|= TTY_OE
;
1714 if (line_status
& LSR_PE
)
1715 recv_data
|= TTY_PE
;
1717 (*linesw
[tp
->t_line
].l_rint
)(recv_data
, tp
);
1719 } while (buf
< com
->iptr
);
1721 com_events
-= (com
->iptr
- com
->ibuf
);
1722 com
->iptr
= com
->ibuf
;
1725 * There is now room for another low-level buffer full of input,
1726 * so enable RTS if it is now disabled and there is room in the
1727 * high-level buffer.
1729 if ((com
->state
& CS_RTS_IFLOW
) && !(com
->mcr_image
& MCR_RTS
) &&
1730 !(tp
->t_state
& TS_TBLOCK
))
1731 outb(com
->modem_ctl_port
, com
->mcr_image
|= MCR_RTS
);
1737 lwkt_gettoken(&tty_token
);
1738 #ifndef COM_MULTIPORT
1740 siointr1((struct com_s
*) arg
);
1742 #else /* COM_MULTIPORT */
1743 bool_t possibly_more_intrs
;
1748 * Loop until there is no activity on any port. This is necessary
1749 * to get an interrupt edge more than to avoid another interrupt.
1750 * If the IRQ signal is just an OR of the IRQ signals from several
1751 * devices, then the edge from one may be lost because another is
1756 possibly_more_intrs
= FALSE
;
1757 for (unit
= 0; unit
< sio_numunits
; ++unit
) {
1758 com
= com_addr(unit
);
1761 * would it work here, or be counter-productive?
1765 && (inb(com
->int_id_port
) & IIR_IMASK
)
1768 possibly_more_intrs
= TRUE
;
1770 /* XXX com_unlock(); */
1772 } while (possibly_more_intrs
);
1774 #endif /* COM_MULTIPORT */
1775 lwkt_reltoken(&tty_token
);
1779 * Called with tty_token held and com_lock held.
1782 siointr1(struct com_s
*com
)
1785 u_char modem_status
;
1792 int_ctl
= inb(com
->intr_ctl_port
);
1793 int_ctl_new
= int_ctl
;
1795 while (!com
->gone
) {
1796 if (com
->pps
.ppsparam
.mode
& PPS_CAPTUREBOTH
) {
1797 modem_status
= inb(com
->modem_status_port
);
1798 if ((modem_status
^ com
->last_modem_status
) & MSR_DCD
) {
1799 count
= sys_cputimer
->count();
1800 pps_event(&com
->pps
, count
,
1801 (modem_status
& MSR_DCD
) ?
1802 PPS_CAPTUREASSERT
: PPS_CAPTURECLEAR
);
1805 line_status
= inb(com
->line_status_port
);
1807 /* input event? (check first to help avoid overruns) */
1808 while (line_status
& LSR_RCV_MASK
) {
1809 /* break/unnattached error bits or real input? */
1810 if (!(line_status
& LSR_RXRDY
))
1813 recv_data
= inb(com
->data_port
);
1816 * Solaris implements a new BREAK which is initiated
1817 * by a character sequence CR ~ ^b which is similar
1818 * to a familiar pattern used on Sun servers by the
1821 #define KEY_CRTLB 2 /* ^B */
1822 #define KEY_CR 13 /* CR '\r' */
1823 #define KEY_TILDE 126 /* ~ */
1825 if (com
->unit
== comconsole
&& alt_break_to_debugger
) {
1826 static int brk_state1
= 0, brk_state2
= 0;
1827 if (recv_data
== KEY_CR
) {
1828 brk_state1
= recv_data
;
1830 } else if (brk_state1
== KEY_CR
&& (recv_data
== KEY_TILDE
|| recv_data
== KEY_CRTLB
)) {
1831 if (recv_data
== KEY_TILDE
)
1832 brk_state2
= recv_data
;
1833 else if (brk_state2
== KEY_TILDE
&& recv_data
== KEY_CRTLB
) {
1837 brk_state1
= brk_state2
= 0;
1845 if (line_status
& (LSR_BI
| LSR_FE
| LSR_PE
)) {
1847 * Don't store BI if IGNBRK or FE/PE if IGNPAR.
1848 * Otherwise, push the work to a higher level
1849 * (to handle PARMRK) if we're bypassing.
1850 * Otherwise, convert BI/FE and PE+INPCK to 0.
1852 * This makes bypassing work right in the
1853 * usual "raw" case (IGNBRK set, and IGNPAR
1856 * Note: BI together with FE/PE means just BI.
1858 if (line_status
& LSR_BI
) {
1860 if (com
->unit
== comconsole
&&
1861 break_to_debugger
) {
1869 || com
->tp
->t_iflag
& IGNBRK
)
1873 || com
->tp
->t_iflag
& IGNPAR
)
1876 if (com
->tp
->t_state
& TS_CAN_BYPASS_L_RINT
1877 && (line_status
& (LSR_BI
| LSR_FE
)
1878 || com
->tp
->t_iflag
& INPCK
))
1882 if (com
->hotchar
!= 0 && recv_data
== com
->hotchar
)
1885 if (ioptr
>= com
->ibufend
)
1886 CE_RECORD(com
, CE_INTERRUPT_BUF_OVERFLOW
);
1888 if (com
->do_timestamp
)
1889 microtime(&com
->timestamp
);
1892 #if 0 /* for testing input latency vs efficiency */
1893 if (com
->iptr
- com
->ibuf
== 8)
1896 ioptr
[0] = recv_data
;
1897 ioptr
[com
->ierroff
] = line_status
;
1898 com
->iptr
= ++ioptr
;
1899 if (ioptr
== com
->ihighwater
1900 && com
->state
& CS_RTS_IFLOW
)
1901 outb(com
->modem_ctl_port
,
1902 com
->mcr_image
&= ~MCR_RTS
);
1903 if (line_status
& LSR_OE
)
1904 CE_RECORD(com
, CE_OVERRUN
);
1908 * "& 0x7F" is to avoid the gcc-1.40 generating a slow
1909 * jump from the top of the loop to here
1911 line_status
= inb(com
->line_status_port
) & 0x7F;
1914 /* modem status change? (always check before doing output) */
1915 modem_status
= inb(com
->modem_status_port
);
1916 if (modem_status
!= com
->last_modem_status
) {
1917 if (com
->do_dcd_timestamp
1918 && !(com
->last_modem_status
& MSR_DCD
)
1919 && modem_status
& MSR_DCD
)
1920 microtime(&com
->dcd_timestamp
);
1923 * Schedule high level to handle DCD changes. Note
1924 * that we don't use the delta bits anywhere. Some
1925 * UARTs mess them up, and it's easy to remember the
1926 * previous bits and calculate the delta.
1928 com
->last_modem_status
= modem_status
;
1929 if (!(com
->state
& CS_CHECKMSR
)) {
1930 com_events
+= LOTS_OF_EVENTS
;
1931 com
->state
|= CS_CHECKMSR
;
1935 /* handle CTS change immediately for crisp flow ctl */
1936 if (com
->state
& CS_CTS_OFLOW
) {
1937 if (modem_status
& MSR_CTS
)
1938 com
->state
|= CS_ODEVREADY
;
1940 com
->state
&= ~CS_ODEVREADY
;
1944 /* output queued and everything ready? */
1945 if ((line_status
& LSR_TXRDY
)
1946 && com
->state
>= (CS_BUSY
| CS_TTGO
| CS_ODEVREADY
)) {
1947 ioptr
= com
->obufq
.l_head
;
1948 if (com
->tx_fifo_size
> 1) {
1951 ocount
= com
->obufq
.l_tail
- ioptr
;
1952 if (ocount
> com
->tx_fifo_size
)
1953 ocount
= com
->tx_fifo_size
;
1954 com
->bytes_out
+= ocount
;
1956 outb(com
->data_port
, *ioptr
++);
1957 while (--ocount
!= 0);
1959 outb(com
->data_port
, *ioptr
++);
1962 com
->obufq
.l_head
= ioptr
;
1963 if (COM_IIR_TXRDYBUG(com
->flags
)) {
1964 int_ctl_new
= int_ctl
| IER_ETXRDY
;
1966 if (ioptr
>= com
->obufq
.l_tail
) {
1969 qp
= com
->obufq
.l_next
;
1970 qp
->l_queued
= FALSE
;
1973 com
->obufq
.l_head
= qp
->l_head
;
1974 com
->obufq
.l_tail
= qp
->l_tail
;
1975 com
->obufq
.l_next
= qp
;
1977 /* output just completed */
1978 if (COM_IIR_TXRDYBUG(com
->flags
)) {
1979 int_ctl_new
= int_ctl
& ~IER_ETXRDY
;
1981 com
->state
&= ~CS_BUSY
;
1983 if (!(com
->state
& CS_ODONE
)) {
1984 com_events
+= LOTS_OF_EVENTS
;
1985 com
->state
|= CS_ODONE
;
1986 setsofttty(); /* handle at high level ASAP */
1989 if (COM_IIR_TXRDYBUG(com
->flags
) && (int_ctl
!= int_ctl_new
)) {
1990 outb(com
->intr_ctl_port
, int_ctl_new
);
1995 #ifdef COM_MULTIPORT
1998 if (inb(com
->int_id_port
) & IIR_NOPEND
)
2005 sioioctl(struct dev_ioctl_args
*ap
)
2007 cdev_t dev
= ap
->a_head
.a_dev
;
2008 caddr_t data
= ap
->a_data
;
2014 lwkt_gettoken(&tty_token
);
2017 com
= com_addr(MINOR_TO_UNIT(mynor
));
2018 if (com
== NULL
|| com
->gone
) {
2019 lwkt_reltoken(&tty_token
);
2022 if (mynor
& CONTROL_MASK
) {
2025 switch (mynor
& CONTROL_MASK
) {
2026 case CONTROL_INIT_STATE
:
2027 ct
= mynor
& CALLOUT_MASK
? &com
->it_out
: &com
->it_in
;
2029 case CONTROL_LOCK_STATE
:
2030 ct
= mynor
& CALLOUT_MASK
? &com
->lt_out
: &com
->lt_in
;
2033 lwkt_reltoken(&tty_token
);
2034 return (ENODEV
); /* /dev/nodev */
2036 switch (ap
->a_cmd
) {
2038 error
= priv_check_cred(ap
->a_cred
, PRIV_ROOT
, 0);
2040 lwkt_reltoken(&tty_token
);
2043 *ct
= *(struct termios
*)data
;
2044 lwkt_reltoken(&tty_token
);
2047 *(struct termios
*)data
= *ct
;
2048 lwkt_reltoken(&tty_token
);
2051 *(int *)data
= TTYDISC
;
2052 lwkt_reltoken(&tty_token
);
2055 bzero(data
, sizeof(struct winsize
));
2056 lwkt_reltoken(&tty_token
);
2059 lwkt_reltoken(&tty_token
);
2064 if (ap
->a_cmd
== TIOCSETA
|| ap
->a_cmd
== TIOCSETAW
||
2065 ap
->a_cmd
== TIOCSETAF
) {
2067 struct termios
*dt
= (struct termios
*)data
;
2068 struct termios
*lt
= mynor
& CALLOUT_MASK
2069 ? &com
->lt_out
: &com
->lt_in
;
2071 dt
->c_iflag
= (tp
->t_iflag
& lt
->c_iflag
)
2072 | (dt
->c_iflag
& ~lt
->c_iflag
);
2073 dt
->c_oflag
= (tp
->t_oflag
& lt
->c_oflag
)
2074 | (dt
->c_oflag
& ~lt
->c_oflag
);
2075 dt
->c_cflag
= (tp
->t_cflag
& lt
->c_cflag
)
2076 | (dt
->c_cflag
& ~lt
->c_cflag
);
2077 dt
->c_lflag
= (tp
->t_lflag
& lt
->c_lflag
)
2078 | (dt
->c_lflag
& ~lt
->c_lflag
);
2079 for (cc
= 0; cc
< NCCS
; ++cc
)
2080 if (lt
->c_cc
[cc
] != 0)
2081 dt
->c_cc
[cc
] = tp
->t_cc
[cc
];
2082 if (lt
->c_ispeed
!= 0)
2083 dt
->c_ispeed
= tp
->t_ispeed
;
2084 if (lt
->c_ospeed
!= 0)
2085 dt
->c_ospeed
= tp
->t_ospeed
;
2087 error
= (*linesw
[tp
->t_line
].l_ioctl
)(tp
, ap
->a_cmd
, data
, ap
->a_fflag
, ap
->a_cred
);
2088 if (error
!= ENOIOCTL
) {
2089 lwkt_reltoken(&tty_token
);
2093 error
= ttioctl(tp
, ap
->a_cmd
, data
, ap
->a_fflag
);
2094 disc_optim(tp
, &tp
->t_termios
, com
);
2095 if (error
!= ENOIOCTL
) {
2097 lwkt_reltoken(&tty_token
);
2100 switch (ap
->a_cmd
) {
2102 sio_setreg(com
, com_cfcr
, com
->cfcr_image
|= CFCR_SBREAK
);
2105 sio_setreg(com
, com_cfcr
, com
->cfcr_image
&= ~CFCR_SBREAK
);
2108 (void)commctl(com
, TIOCM_DTR
, DMBIS
);
2111 (void)commctl(com
, TIOCM_DTR
, DMBIC
);
2114 * XXX should disallow changing MCR_RTS if CS_RTS_IFLOW is set. The
2115 * changes get undone on the next call to comparam().
2118 (void)commctl(com
, *(int *)data
, DMSET
);
2121 (void)commctl(com
, *(int *)data
, DMBIS
);
2124 (void)commctl(com
, *(int *)data
, DMBIC
);
2127 *(int *)data
= commctl(com
, 0, DMGET
);
2130 /* must be root since the wait applies to following logins */
2131 error
= priv_check_cred(ap
->a_cred
, PRIV_ROOT
, 0);
2134 lwkt_reltoken(&tty_token
);
2137 com
->dtr_wait
= *(int *)data
* hz
/ 100;
2140 *(int *)data
= com
->dtr_wait
* 100 / hz
;
2143 com
->do_timestamp
= TRUE
;
2144 *(struct timeval
*)data
= com
->timestamp
;
2146 case TIOCDCDTIMESTAMP
:
2147 com
->do_dcd_timestamp
= TRUE
;
2148 *(struct timeval
*)data
= com
->dcd_timestamp
;
2152 error
= pps_ioctl(ap
->a_cmd
, data
, &com
->pps
);
2153 if (error
== ENODEV
)
2155 lwkt_reltoken(&tty_token
);
2159 lwkt_reltoken(&tty_token
);
2164 siopoll(void *dummy
, void *frame
)
2168 lwkt_gettoken(&tty_token
);
2169 if (com_events
== 0) {
2170 lwkt_reltoken(&tty_token
);
2175 for (unit
= 0; unit
< sio_numunits
; ++unit
) {
2180 com
= com_addr(unit
);
2184 if (tp
== NULL
|| com
->gone
) {
2186 * Discard any events related to never-opened or
2187 * going-away devices.
2190 incc
= com
->iptr
- com
->ibuf
;
2191 com
->iptr
= com
->ibuf
;
2192 if (com
->state
& CS_CHECKMSR
) {
2193 incc
+= LOTS_OF_EVENTS
;
2194 com
->state
&= ~CS_CHECKMSR
;
2200 if (com
->iptr
!= com
->ibuf
) {
2205 if (com
->state
& CS_CHECKMSR
) {
2206 u_char delta_modem_status
;
2209 delta_modem_status
= com
->last_modem_status
2210 ^ com
->prev_modem_status
;
2211 com
->prev_modem_status
= com
->last_modem_status
;
2212 com_events
-= LOTS_OF_EVENTS
;
2213 com
->state
&= ~CS_CHECKMSR
;
2215 if (delta_modem_status
& MSR_DCD
)
2216 (*linesw
[tp
->t_line
].l_modem
)
2217 (tp
, com
->prev_modem_status
& MSR_DCD
);
2219 if (com
->state
& CS_ODONE
) {
2221 com_events
-= LOTS_OF_EVENTS
;
2222 com
->state
&= ~CS_ODONE
;
2224 if (!(com
->state
& CS_BUSY
)
2225 && !(com
->extra_state
& CSE_BUSYCHECK
)) {
2226 callout_reset(&com
->busy_ch
, hz
/ 100,
2228 com
->extra_state
|= CSE_BUSYCHECK
;
2230 (*linesw
[tp
->t_line
].l_start
)(tp
);
2232 if (com_events
== 0)
2235 if (com_events
>= LOTS_OF_EVENTS
)
2237 lwkt_reltoken(&tty_token
);
2241 * Called with tty_token held but no com_lock
2244 comparam(struct tty
*tp
, struct termios
*t
)
2254 unit
= DEV_TO_UNIT(tp
->t_dev
);
2255 com
= com_addr(unit
);
2260 /* do historical conversions */
2261 if (t
->c_ispeed
== 0)
2262 t
->c_ispeed
= t
->c_ospeed
;
2264 /* check requested parameters */
2265 if (t
->c_ospeed
== 0)
2268 if (t
->c_ispeed
!= t
->c_ospeed
)
2270 divisor
= siodivisor(com
->rclk
, t
->c_ispeed
);
2275 /* parameters are OK, convert them to the com struct and the device */
2278 (void)commctl(com
, TIOCM_DTR
, DMBIC
); /* hang up line */
2280 (void)commctl(com
, TIOCM_DTR
, DMBIS
);
2282 switch (cflag
& CSIZE
) {
2296 if (cflag
& PARENB
) {
2298 if (!(cflag
& PARODD
))
2304 if (com
->hasfifo
&& divisor
!= 0) {
2306 * Use a fifo trigger level low enough so that the input
2307 * latency from the fifo is less than about 16 msec and
2308 * the total latency is less than about 30 msec. These
2309 * latencies are reasonable for humans. Serial comms
2310 * protocols shouldn't expect anything better since modem
2311 * latencies are larger.
2313 * Interrupts can be held up for long periods of time
2314 * due to inefficiencies in other parts of the kernel,
2315 * certain video cards, etc. Setting the FIFO trigger
2316 * point to MEDH instead of HIGH gives us 694uS of slop
2317 * (8 character times) instead of 173uS (2 character times)
2320 com
->fifo_image
= t
->c_ospeed
<= 4800
2321 ? FIFO_ENABLE
: FIFO_ENABLE
| FIFO_RX_MEDH
;
2324 * The Hayes ESP card needs the fifo DMA mode bit set
2325 * in compatibility mode. If not, it will interrupt
2326 * for each character received.
2329 com
->fifo_image
|= FIFO_DMA_MODE
;
2331 sio_setreg(com
, com_fifo
, com
->fifo_image
);
2335 * This returns with interrupts disabled so that we can complete
2336 * the speed change atomically. Keeping interrupts disabled is
2337 * especially important while com_data is hidden.
2339 (void) siosetwater(com
, t
->c_ispeed
);
2342 sio_setreg(com
, com_cfcr
, cfcr
| CFCR_DLAB
);
2344 * Only set the divisor registers if they would change,
2345 * since on some 16550 incompatibles (UMC8669F), setting
2346 * them while input is arriving them loses sync until
2347 * data stops arriving.
2349 dlbl
= divisor
& 0xFF;
2350 if (sio_getreg(com
, com_dlbl
) != dlbl
)
2351 sio_setreg(com
, com_dlbl
, dlbl
);
2352 dlbh
= divisor
>> 8;
2353 if (sio_getreg(com
, com_dlbh
) != dlbh
)
2354 sio_setreg(com
, com_dlbh
, dlbh
);
2357 sio_setreg(com
, com_cfcr
, com
->cfcr_image
= cfcr
);
2359 if (!(tp
->t_state
& TS_TTSTOP
))
2360 com
->state
|= CS_TTGO
;
2362 if (cflag
& CRTS_IFLOW
) {
2363 if (com
->st16650a
) {
2364 sio_setreg(com
, com_cfcr
, 0xbf);
2365 sio_setreg(com
, com_fifo
,
2366 sio_getreg(com
, com_fifo
) | 0x40);
2368 com
->state
|= CS_RTS_IFLOW
;
2370 * If CS_RTS_IFLOW just changed from off to on, the change
2371 * needs to be propagated to MCR_RTS. This isn't urgent,
2372 * so do it later by calling comstart() instead of repeating
2373 * a lot of code from comstart() here.
2375 } else if (com
->state
& CS_RTS_IFLOW
) {
2376 com
->state
&= ~CS_RTS_IFLOW
;
2378 * CS_RTS_IFLOW just changed from on to off. Force MCR_RTS
2379 * on here, since comstart() won't do it later.
2381 outb(com
->modem_ctl_port
, com
->mcr_image
|= MCR_RTS
);
2382 if (com
->st16650a
) {
2383 sio_setreg(com
, com_cfcr
, 0xbf);
2384 sio_setreg(com
, com_fifo
,
2385 sio_getreg(com
, com_fifo
) & ~0x40);
2391 * Set up state to handle output flow control.
2392 * XXX - worth handling MDMBUF (DCD) flow control at the lowest level?
2393 * Now has 10+ msec latency, while CTS flow has 50- usec latency.
2395 com
->state
|= CS_ODEVREADY
;
2396 com
->state
&= ~CS_CTS_OFLOW
;
2397 if (cflag
& CCTS_OFLOW
) {
2398 com
->state
|= CS_CTS_OFLOW
;
2399 if (!(com
->last_modem_status
& MSR_CTS
))
2400 com
->state
&= ~CS_ODEVREADY
;
2401 if (com
->st16650a
) {
2402 sio_setreg(com
, com_cfcr
, 0xbf);
2403 sio_setreg(com
, com_fifo
,
2404 sio_getreg(com
, com_fifo
) | 0x80);
2407 if (com
->st16650a
) {
2408 sio_setreg(com
, com_cfcr
, 0xbf);
2409 sio_setreg(com
, com_fifo
,
2410 sio_getreg(com
, com_fifo
) & ~0x80);
2414 sio_setreg(com
, com_cfcr
, com
->cfcr_image
);
2416 /* XXX shouldn't call functions while intrs are disabled. */
2417 disc_optim(tp
, t
, com
);
2419 * Recover from fiddling with CS_TTGO. We used to call siointr1()
2420 * unconditionally, but that defeated the careful discarding of
2421 * stale input in sioopen().
2423 if (com
->state
>= (CS_BUSY
| CS_TTGO
)) {
2430 if (com
->ibufold
!= NULL
) {
2431 kfree(com
->ibufold
, M_DEVBUF
);
2432 com
->ibufold
= NULL
;
2438 * called with tty_token held
2441 siosetwater(struct com_s
*com
, speed_t speed
)
2449 * Make the buffer size large enough to handle a softtty interrupt
2450 * latency of about 2 ticks without loss of throughput or data
2451 * (about 3 ticks if input flow control is not used or not honoured,
2452 * but a bit less for CS5-CS7 modes).
2454 cp4ticks
= speed
/ 10 / hz
* 4;
2455 for (ibufsize
= 128; ibufsize
< cp4ticks
;)
2457 if (ibufsize
== com
->ibufsize
)
2461 * Allocate input buffer. The extra factor of 2 in the size is
2462 * to allow for an error byte for each input byte.
2464 ibuf
= kmalloc(2 * ibufsize
, M_DEVBUF
, M_WAITOK
| M_ZERO
);
2466 /* Initialize non-critical variables. */
2467 com
->ibufold
= com
->ibuf
;
2468 com
->ibufsize
= ibufsize
;
2471 tp
->t_ififosize
= 2 * ibufsize
;
2472 tp
->t_ispeedwat
= (speed_t
)-1;
2473 tp
->t_ospeedwat
= (speed_t
)-1;
2477 * Read current input buffer.
2480 if (com
->iptr
!= com
->ibuf
)
2484 * Initialize critical variables, including input buffer watermarks.
2485 * The external device is asked to stop sending when the buffer
2486 * exactly reaches high water, or when the high level requests it.
2487 * The high level is notified immediately (rather than at a later
2488 * clock tick) when this watermark is reached.
2489 * The buffer size is chosen so the watermark should almost never
2491 * The low watermark is invisibly 0 since the buffer is always
2492 * emptied all at once.
2494 com
->iptr
= com
->ibuf
= ibuf
;
2495 com
->ibufend
= ibuf
+ ibufsize
;
2496 com
->ierroff
= ibufsize
;
2497 com
->ihighwater
= ibuf
+ 3 * ibufsize
/ 4;
2503 comstart(struct tty
*tp
)
2508 lwkt_gettoken(&tty_token
);
2509 unit
= DEV_TO_UNIT(tp
->t_dev
);
2510 com
= com_addr(unit
);
2512 lwkt_reltoken(&tty_token
);
2517 if (tp
->t_state
& TS_TTSTOP
)
2518 com
->state
&= ~CS_TTGO
;
2520 com
->state
|= CS_TTGO
;
2521 if (tp
->t_state
& TS_TBLOCK
) {
2522 if (com
->mcr_image
& MCR_RTS
&& com
->state
& CS_RTS_IFLOW
)
2523 outb(com
->modem_ctl_port
, com
->mcr_image
&= ~MCR_RTS
);
2525 if (!(com
->mcr_image
& MCR_RTS
) && com
->iptr
< com
->ihighwater
2526 && com
->state
& CS_RTS_IFLOW
)
2527 outb(com
->modem_ctl_port
, com
->mcr_image
|= MCR_RTS
);
2530 if (tp
->t_state
& (TS_TIMEOUT
| TS_TTSTOP
)) {
2533 lwkt_reltoken(&tty_token
);
2536 if (tp
->t_outq
.c_cc
!= 0) {
2540 if (!com
->obufs
[0].l_queued
) {
2541 com
->obufs
[0].l_tail
2542 = com
->obuf1
+ q_to_b(&tp
->t_outq
, com
->obuf1
,
2544 com
->obufs
[0].l_next
= NULL
;
2545 com
->obufs
[0].l_queued
= TRUE
;
2547 if (com
->state
& CS_BUSY
) {
2548 qp
= com
->obufq
.l_next
;
2549 while ((next
= qp
->l_next
) != NULL
)
2551 qp
->l_next
= &com
->obufs
[0];
2553 com
->obufq
.l_head
= com
->obufs
[0].l_head
;
2554 com
->obufq
.l_tail
= com
->obufs
[0].l_tail
;
2555 com
->obufq
.l_next
= &com
->obufs
[0];
2556 com
->state
|= CS_BUSY
;
2560 if (tp
->t_outq
.c_cc
!= 0 && !com
->obufs
[1].l_queued
) {
2561 com
->obufs
[1].l_tail
2562 = com
->obuf2
+ q_to_b(&tp
->t_outq
, com
->obuf2
,
2564 com
->obufs
[1].l_next
= NULL
;
2565 com
->obufs
[1].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
[1];
2573 com
->obufq
.l_head
= com
->obufs
[1].l_head
;
2574 com
->obufq
.l_tail
= com
->obufs
[1].l_tail
;
2575 com
->obufq
.l_next
= &com
->obufs
[1];
2576 com
->state
|= CS_BUSY
;
2580 tp
->t_state
|= TS_BUSY
;
2583 if (com
->state
>= (CS_BUSY
| CS_TTGO
))
2584 siointr1(com
); /* fake interrupt to start output */
2588 lwkt_reltoken(&tty_token
);
2592 comstop(struct tty
*tp
, int rw
)
2596 lwkt_gettoken(&tty_token
);
2597 com
= com_addr(DEV_TO_UNIT(tp
->t_dev
));
2598 if (com
== NULL
|| com
->gone
) {
2599 lwkt_reltoken(&tty_token
);
2606 /* XXX avoid h/w bug. */
2609 sio_setreg(com
, com_fifo
,
2610 FIFO_XMT_RST
| com
->fifo_image
);
2611 com
->obufs
[0].l_queued
= FALSE
;
2612 com
->obufs
[1].l_queued
= FALSE
;
2613 if (com
->state
& CS_ODONE
)
2614 com_events
-= LOTS_OF_EVENTS
;
2615 com
->state
&= ~(CS_ODONE
| CS_BUSY
);
2616 com
->tp
->t_state
&= ~TS_BUSY
;
2621 /* XXX avoid h/w bug. */
2624 sio_setreg(com
, com_fifo
,
2625 FIFO_RCV_RST
| com
->fifo_image
);
2626 com_events
-= (com
->iptr
- com
->ibuf
);
2627 com
->iptr
= com
->ibuf
;
2631 lwkt_reltoken(&tty_token
);
2635 commctl(struct com_s
*com
, int bits
, int how
)
2640 lwkt_gettoken(&tty_token
);
2642 bits
= TIOCM_LE
; /* XXX - always enabled while open */
2643 mcr
= com
->mcr_image
;
2648 msr
= com
->prev_modem_status
;
2656 * XXX - MSR_RI is naturally volatile, and we make MSR_TERI
2657 * more volatile by reading the modem status a lot. Perhaps
2658 * we should latch both bits until the status is read here.
2660 if (msr
& (MSR_RI
| MSR_TERI
))
2662 lwkt_reltoken(&tty_token
);
2666 if (bits
& TIOCM_DTR
)
2668 if (bits
& TIOCM_RTS
)
2671 lwkt_reltoken(&tty_token
);
2677 outb(com
->modem_ctl_port
,
2678 com
->mcr_image
= mcr
| (com
->mcr_image
& MCR_IENABLE
));
2681 outb(com
->modem_ctl_port
, com
->mcr_image
|= mcr
);
2684 outb(com
->modem_ctl_port
, com
->mcr_image
&= ~mcr
);
2688 lwkt_reltoken(&tty_token
);
2693 * NOTE: Must be called with tty_token held
2702 ASSERT_LWKT_TOKEN_HELD(&tty_token
);
2704 * Set our timeout period to 1 second if no polled devices are open.
2705 * Otherwise set it to max(1/200, 1/hz).
2706 * Enable timeouts iff some device is open.
2708 callout_stop(&sio_timeout_handle
);
2711 for (unit
= 0; unit
< sio_numunits
; ++unit
) {
2712 com
= com_addr(unit
);
2713 if (com
!= NULL
&& com
->tp
!= NULL
2714 && com
->tp
->t_state
& TS_ISOPEN
&& !com
->gone
) {
2716 if (com
->poll
|| com
->poll_output
) {
2717 sio_timeout
= hz
> 200 ? hz
/ 200 : 1;
2723 sio_timeouts_until_log
= hz
/ sio_timeout
;
2724 callout_reset(&sio_timeout_handle
, sio_timeout
,
2727 /* Flush error messages, if any. */
2728 sio_timeouts_until_log
= 1;
2730 callout_stop(&sio_timeout_handle
);
2735 * NOTE: Must be called with tty_token held
2738 comwakeup(void *chan
)
2744 * Can be called from a callout too so just get the token
2746 lwkt_gettoken(&tty_token
);
2747 callout_reset(&sio_timeout_handle
, sio_timeout
, comwakeup
, NULL
);
2750 * Recover from lost output interrupts.
2751 * Poll any lines that don't use interrupts.
2753 for (unit
= 0; unit
< sio_numunits
; ++unit
) {
2754 com
= com_addr(unit
);
2755 if (com
!= NULL
&& !com
->gone
2756 && (com
->state
>= (CS_BUSY
| CS_TTGO
) || com
->poll
)) {
2764 * Check for and log errors, but not too often.
2766 if (--sio_timeouts_until_log
> 0) {
2767 lwkt_reltoken(&tty_token
);
2770 sio_timeouts_until_log
= hz
/ sio_timeout
;
2771 for (unit
= 0; unit
< sio_numunits
; ++unit
) {
2774 com
= com_addr(unit
);
2779 for (errnum
= 0; errnum
< CE_NTYPES
; ++errnum
) {
2784 delta
= com
->delta_error_counts
[errnum
];
2785 com
->delta_error_counts
[errnum
] = 0;
2789 total
= com
->error_counts
[errnum
] += delta
;
2790 log(LOG_ERR
, "sio%d: %u more %s%s (total %lu)\n",
2791 unit
, delta
, error_desc
[errnum
],
2792 delta
== 1 ? "" : "s", total
);
2795 lwkt_reltoken(&tty_token
);
2799 disc_optim(struct tty
*tp
, struct termios
*t
, struct com_s
*com
)
2801 lwkt_gettoken(&tty_token
);
2802 if (!(t
->c_iflag
& (ICRNL
| IGNCR
| IMAXBEL
| INLCR
| ISTRIP
| IXON
))
2803 && (!(t
->c_iflag
& BRKINT
) || (t
->c_iflag
& IGNBRK
))
2804 && (!(t
->c_iflag
& PARMRK
)
2805 || (t
->c_iflag
& (IGNPAR
| IGNBRK
)) == (IGNPAR
| IGNBRK
))
2806 && !(t
->c_lflag
& (ECHO
| ICANON
| IEXTEN
| ISIG
| PENDIN
))
2807 && linesw
[tp
->t_line
].l_rint
== ttyinput
)
2808 tp
->t_state
|= TS_CAN_BYPASS_L_RINT
;
2810 tp
->t_state
&= ~TS_CAN_BYPASS_L_RINT
;
2811 com
->hotchar
= linesw
[tp
->t_line
].l_hotchar
;
2812 lwkt_reltoken(&tty_token
);
2816 * Following are all routines needed for SIO to act as console
2818 #include <sys/cons.h>
2828 static speed_t
siocngetspeed (Port_t
, u_long rclk
);
2830 static void siocnclose (struct siocnstate
*sp
, Port_t iobase
);
2832 static void siocnopen (struct siocnstate
*sp
, Port_t iobase
, int speed
);
2833 static void siocntxwait (Port_t iobase
);
2835 static cn_probe_t siocnprobe
;
2836 static cn_init_t siocninit
;
2837 static cn_init_fini_t siocninit_fini
;
2838 static cn_checkc_t siocncheckc
;
2839 static cn_getc_t siocngetc
;
2840 static cn_putc_t siocnputc
;
2842 #if defined(__i386__) || defined(__x86_64__)
2843 CONS_DRIVER(sio
, siocnprobe
, siocninit
, siocninit_fini
,
2844 NULL
, siocngetc
, siocncheckc
, siocnputc
, NULL
, NULL
);
2847 /* To get the GDB related variables */
2849 #include <ddb/ddb.h>
2853 siocntxwait(Port_t iobase
)
2858 * Wait for any pending transmission to finish. Required to avoid
2859 * the UART lockup bug when the speed is changed, and for normal
2863 while ((inb(iobase
+ com_lsr
) & (LSR_TSRE
| LSR_TXRDY
))
2864 != (LSR_TSRE
| LSR_TXRDY
) && --timo
!= 0)
2869 * Read the serial port specified and try to figure out what speed
2870 * it's currently running at. We're assuming the serial port has
2871 * been initialized and is basicly idle. This routine is only intended
2872 * to be run at system startup.
2874 * If the value read from the serial port doesn't make sense, return 0.
2877 * NOTE: Must be called with tty_token held
2880 siocngetspeed(Port_t iobase
, u_long rclk
)
2887 cfcr
= inb(iobase
+ com_cfcr
);
2888 outb(iobase
+ com_cfcr
, CFCR_DLAB
| cfcr
);
2890 dlbl
= inb(iobase
+ com_dlbl
);
2891 dlbh
= inb(iobase
+ com_dlbh
);
2893 outb(iobase
+ com_cfcr
, cfcr
);
2895 divisor
= dlbh
<< 8 | dlbl
;
2897 /* XXX there should be more sanity checking. */
2900 return (rclk
/ (16UL * divisor
));
2904 siocnopen(struct siocnstate
*sp
, Port_t iobase
, int speed
)
2911 * Save all the device control registers except the fifo register
2912 * and set our default ones (cs8 -parenb speed=comdefaultrate).
2913 * We can't save the fifo register since it is read-only.
2915 sp
->ier
= inb(iobase
+ com_ier
);
2916 outb(iobase
+ com_ier
, 0); /* spltty() doesn't stop siointr() */
2917 siocntxwait(iobase
);
2918 sp
->cfcr
= inb(iobase
+ com_cfcr
);
2919 outb(iobase
+ com_cfcr
, CFCR_DLAB
| CFCR_8BITS
);
2920 sp
->dlbl
= inb(iobase
+ com_dlbl
);
2921 sp
->dlbh
= inb(iobase
+ com_dlbh
);
2923 * Only set the divisor registers if they would change, since on
2924 * some 16550 incompatibles (Startech), setting them clears the
2925 * data input register. This also reduces the effects of the
2928 divisor
= siodivisor(comdefaultrclk
, speed
);
2929 dlbl
= divisor
& 0xFF;
2930 if (sp
->dlbl
!= dlbl
)
2931 outb(iobase
+ com_dlbl
, dlbl
);
2932 dlbh
= divisor
>> 8;
2933 if (sp
->dlbh
!= dlbh
)
2934 outb(iobase
+ com_dlbh
, dlbh
);
2935 outb(iobase
+ com_cfcr
, CFCR_8BITS
);
2936 sp
->mcr
= inb(iobase
+ com_mcr
);
2938 * We don't want interrupts, but must be careful not to "disable"
2939 * them by clearing the MCR_IENABLE bit, since that might cause
2940 * an interrupt by floating the IRQ line.
2942 outb(iobase
+ com_mcr
, (sp
->mcr
& MCR_IENABLE
) | MCR_DTR
| MCR_RTS
);
2947 siocnclose(struct siocnstate
*sp
, Port_t iobase
)
2950 * Restore the device control registers.
2952 siocntxwait(iobase
);
2953 outb(iobase
+ com_cfcr
, CFCR_DLAB
| CFCR_8BITS
);
2954 if (sp
->dlbl
!= inb(iobase
+ com_dlbl
))
2955 outb(iobase
+ com_dlbl
, sp
->dlbl
);
2956 if (sp
->dlbh
!= inb(iobase
+ com_dlbh
))
2957 outb(iobase
+ com_dlbh
, sp
->dlbh
);
2958 outb(iobase
+ com_cfcr
, sp
->cfcr
);
2960 * XXX damp oscillations of MCR_DTR and MCR_RTS by not restoring them.
2962 outb(iobase
+ com_mcr
, sp
->mcr
| MCR_DTR
| MCR_RTS
);
2963 outb(iobase
+ com_ier
, sp
->ier
);
2968 siocnprobe(struct consdev
*cp
)
2973 struct siocnstate sp
;
2976 * Find our first enabled console, if any. If it is a high-level
2977 * console device, then initialize it and return successfully.
2978 * If it is a low-level console device, then initialize it and
2979 * return unsuccessfully. It must be initialized in both cases
2980 * for early use by console drivers and debuggers. Initializing
2981 * the hardware is not necessary in all cases, since the i/o
2982 * routines initialize it on the fly, but it is necessary if
2983 * input might arrive while the hardware is switched back to an
2984 * uninitialized state. We can't handle multiple console devices
2985 * yet because our low-level routines don't take a device arg.
2986 * We trust the user to set the console flags properly so that we
2987 * don't need to probe.
2989 cp
->cn_pri
= CN_DEAD
;
2991 for (unit
= 0; unit
< 16; unit
++) { /* XXX need to know how many */
2994 if (resource_int_value("sio", unit
, "disabled", &disabled
) == 0) {
2998 if (resource_int_value("sio", unit
, "flags", &flags
))
3000 if (COM_CONSOLE(flags
) || COM_DEBUGGER(flags
)) {
3006 if (resource_int_value("sio", unit
, "port", &port
))
3008 if (resource_int_value("sio", unit
, "baud", &baud
) == 0)
3014 if (boothowto
& RB_SERIAL
) {
3015 if (boot_speed
== 0) {
3016 boot_speed
= siocngetspeed(iobase
,
3020 comdefaultrate
= boot_speed
;
3024 * Initialize the divisor latch. We can't rely on
3025 * siocnopen() to do this the first time, since it
3026 * avoids writing to the latch if the latch appears
3027 * to have the correct value. Also, if we didn't
3028 * just read the speed from the hardware, then we
3029 * need to set the speed in hardware so that
3030 * switching it later is null.
3033 cfcr
= inb(iobase
+ com_cfcr
);
3034 outb(iobase
+ com_cfcr
, CFCR_DLAB
| cfcr
);
3035 divisor
= siodivisor(comdefaultrclk
, comdefaultrate
);
3036 outb(iobase
+ com_dlbl
, divisor
& 0xff);
3037 outb(iobase
+ com_dlbh
, divisor
>> 8);
3038 outb(iobase
+ com_cfcr
, cfcr
);
3040 siocnopen(&sp
, iobase
, comdefaultrate
);
3044 if (COM_CONSOLE(flags
) && !COM_LLCONSOLE(flags
)) {
3045 cp
->cn_probegood
= 1;
3046 cp
->cn_private
= (void *)(intptr_t)unit
;
3047 cp
->cn_pri
= COM_FORCECONSOLE(flags
)
3048 || boothowto
& RB_SERIAL
3049 ? CN_REMOTE
: CN_NORMAL
;
3050 siocniobase
= iobase
;
3053 if (COM_DEBUGGER(flags
) && gdb_tab
== NULL
) {
3054 kprintf("sio%d: gdb debugging port\n", unit
);
3055 siogdbiobase
= iobase
;
3058 cp
->cn_gdbprivate
= (void *)(intptr_t)unit
;
3064 #if defined(__i386__) || defined(__x86_64__)
3067 * XXX Ugly Compatability.
3068 * If no gdb port has been specified, set it to be the console
3069 * as some configuration files don't specify the gdb port.
3071 if (gdb_tab
== NULL
&& (boothowto
& RB_GDB
)) {
3072 kprintf("Warning: no GDB port specified. Defaulting to sio%d.\n",
3074 kprintf("Set flag 0x80 on desired GDB port in your\n");
3075 kprintf("configuration file (currently sio only).\n");
3076 siogdbiobase
= siocniobase
;
3077 siogdbunit
= siocnunit
;
3078 cp
->cn_gdbprivate
= (void *)(intptr_t)siocnunit
;
3086 siocninit(struct consdev
*cp
)
3088 comconsole
= (int)(intptr_t)cp
->cn_private
;
3092 siocninit_fini(struct consdev
*cp
)
3097 if (cp
->cn_probegood
) {
3098 unit
= (int)(intptr_t)cp
->cn_private
;
3100 * Call devfs_find_device_by_name on ttydX to find the correct device,
3101 * as it should have been created already at this point by the
3103 * If it isn't found, the serial port was not attached at all and we
3104 * shouldn't be here, so assert this case.
3106 dev
= devfs_find_device_by_name("ttyd%r", unit
);
3108 KKASSERT(dev
!= NULL
);
3114 siocncheckc(void *private)
3117 int unit
= (int)(intptr_t)private;
3120 struct siocnstate sp
;
3123 if (unit
== siogdbunit
)
3124 iobase
= siogdbiobase
;
3126 iobase
= siocniobase
;
3130 siocnopen(&sp
, iobase
, comdefaultrate
);
3132 if (inb(iobase
+ com_lsr
) & LSR_RXRDY
)
3133 c
= inb(iobase
+ com_data
);
3137 siocnclose(&sp
, iobase
);
3146 siocngetc(void *private)
3149 int unit
= (int)(intptr_t)private;
3152 struct siocnstate sp
;
3155 if (unit
== siogdbunit
)
3156 iobase
= siogdbiobase
;
3158 iobase
= siocniobase
;
3162 siocnopen(&sp
, iobase
, comdefaultrate
);
3164 while (!(inb(iobase
+ com_lsr
) & LSR_RXRDY
))
3166 c
= inb(iobase
+ com_data
);
3168 siocnclose(&sp
, iobase
);
3176 siocnputc(void *private, int c
)
3178 int unit
= (int)(intptr_t)private;
3180 struct siocnstate sp
;
3184 if (unit
== siogdbunit
)
3185 iobase
= siogdbiobase
;
3187 iobase
= siocniobase
;
3191 siocnopen(&sp
, iobase
, comdefaultrate
);
3193 siocntxwait(iobase
);
3194 outb(iobase
+ com_data
, c
);
3196 siocnclose(&sp
, iobase
);
3202 DRIVER_MODULE(sio
, isa
, sio_isa_driver
, sio_devclass
, NULL
, NULL
);
3203 DRIVER_MODULE(sio
, acpi
, sio_isa_driver
, sio_devclass
, NULL
, NULL
);
3205 DRIVER_MODULE(sio
, pci
, sio_pci_driver
, sio_devclass
, NULL
, NULL
);
3208 DRIVER_MODULE(sio
, puc
, sio_puc_driver
, sio_devclass
, NULL
, NULL
);