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 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * from: @(#)com.c 7.5 (Berkeley) 5/16/91
30 * from: i386/isa sio.c,v 1.234
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
36 #include "opt_compat.h"
42 * Serial driver, based on 386BSD-0.1 com driver.
43 * Mostly rewritten to use pseudo-DMA.
44 * Works for National Semiconductor NS8250-NS16550AF UARTs.
45 * COM driver, based on HP dca driver.
47 * Changes for PC Card integration:
48 * - Added PC Card driver table and handlers
50 #include <sys/param.h>
51 #include <sys/systm.h>
54 #include <sys/fcntl.h>
55 #include <sys/interrupt.h>
57 #include <sys/kernel.h>
58 #include <sys/limits.h>
60 #include <sys/malloc.h>
61 #include <sys/module.h>
62 #include <sys/mutex.h>
64 #include <sys/reboot.h>
65 #include <sys/serial.h>
66 #include <sys/sysctl.h>
67 #include <sys/syslog.h>
69 #include <machine/bus.h>
71 #include <sys/timepps.h>
75 #include <isa/isavar.h>
77 #include <machine/resource.h>
79 #include <dev/sio/sioreg.h>
80 #include <dev/sio/siovar.h>
83 #include <dev/ic/esp.h>
85 #include <dev/ic/ns16550.h>
87 #define LOTS_OF_EVENTS 64 /* helps separate urgent events from input */
90 /* checks in flags for multiport and which is multiport "master chip"
93 #define COM_ISMULTIPORT(flags) ((flags) & 0x01)
94 #define COM_MPMASTER(flags) (((flags) >> 8) & 0x0ff)
95 #define COM_NOTAST4(flags) ((flags) & 0x04)
97 #define COM_ISMULTIPORT(flags) (0)
98 #endif /* COM_MULTIPORT */
100 #define COM_C_IIR_TXRDYBUG 0x80000
101 #define COM_CONSOLE(flags) ((flags) & 0x10)
102 #define COM_DEBUGGER(flags) ((flags) & 0x80)
103 #define COM_FIFOSIZE(flags) (((flags) & 0xff000000) >> 24)
104 #define COM_FORCECONSOLE(flags) ((flags) & 0x20)
105 #define COM_IIR_TXRDYBUG(flags) ((flags) & COM_C_IIR_TXRDYBUG)
106 #define COM_LLCONSOLE(flags) ((flags) & 0x40)
107 #define COM_LOSESOUTINTS(flags) ((flags) & 0x08)
108 #define COM_NOFIFO(flags) ((flags) & 0x02)
109 #define COM_NOPROBE(flags) ((flags) & 0x40000)
110 #define COM_NOSCR(flags) ((flags) & 0x100000)
111 #define COM_PPSCTS(flags) ((flags) & 0x10000)
112 #define COM_ST16650A(flags) ((flags) & 0x20000)
113 #define COM_TI16754(flags) ((flags) & 0x200000)
115 #define sio_getreg(com, off) \
116 (bus_space_read_1((com)->bst, (com)->bsh, (off)))
117 #define sio_setreg(com, off, value) \
118 (bus_space_write_1((com)->bst, (com)->bsh, (off), (value)))
122 * (CS_BUSY | CS_TTGO) and (CS_BUSY | CS_TTGO | CS_ODEVREADY) must be higher
123 * than the other bits so that they can be tested as a group without masking
126 * The following com and tty flags correspond closely:
127 * CS_BUSY = TS_BUSY (maintained by comstart(), siopoll() and
129 * CS_TTGO = ~TS_TTSTOP (maintained by comparam() and comstart())
130 * CS_CTS_OFLOW = CCTS_OFLOW (maintained by comparam())
131 * CS_RTS_IFLOW = CRTS_IFLOW (maintained by comparam())
132 * TS_FLUSH is not used.
133 * XXX I think TIOCSETA doesn't clear TS_TTSTOP when it clears IXON.
134 * XXX CS_*FLOW should be CF_*FLOW in com->flags (control flags not state).
136 #define CS_BUSY 0x80 /* output in progress */
137 #define CS_TTGO 0x40 /* output not stopped by XOFF */
138 #define CS_ODEVREADY 0x20 /* external device h/w ready (CTS) */
139 #define CS_CHECKMSR 1 /* check of MSR scheduled */
140 #define CS_CTS_OFLOW 2 /* use CTS output flow control */
141 #define CS_ODONE 4 /* output completed */
142 #define CS_RTS_IFLOW 8 /* use RTS input flow control */
143 #define CSE_BUSYCHECK 1 /* siobusycheck() scheduled */
145 static char const * const error_desc[] = {
148 #define CE_INTERRUPT_BUF_OVERFLOW 1
149 "interrupt-level buffer overflow",
150 #define CE_TTY_BUF_OVERFLOW 2
151 "tty-level buffer overflow",
155 #define CE_RECORD(com, errnum) (++(com)->delta_error_counts[errnum])
157 /* types. XXX - should be elsewhere */
158 typedef u_int Port_t; /* hardware port */
159 typedef u_char bool_t; /* boolean */
161 /* queue of linear buffers */
163 u_char *l_head; /* next char to process */
164 u_char *l_tail; /* one past the last char to process */
165 struct lbq *l_next; /* next in queue */
166 bool_t l_queued; /* nonzero if queued */
169 /* com device structure */
171 u_char state; /* miscellaneous flag bits */
172 u_char cfcr_image; /* copy of value written to CFCR */
174 bool_t esp; /* is this unit a hayes esp board? */
176 u_char extra_state; /* more flag bits, separate for order trick */
177 u_char fifo_image; /* copy of value written to FIFO */
178 bool_t hasfifo; /* nonzero for 16550 UARTs */
179 bool_t loses_outints; /* nonzero if device loses output interrupts */
180 u_char mcr_image; /* copy of value written to MCR */
182 bool_t multiport; /* is this unit part of a multiport device? */
183 #endif /* COM_MULTIPORT */
184 bool_t no_irq; /* nonzero if irq is not attached */
185 bool_t gone; /* hardware disappeared */
186 bool_t poll; /* nonzero if polling is required */
187 bool_t poll_output; /* nonzero if polling for output is required */
188 bool_t st16650a; /* nonzero if Startech 16650A compatible */
189 int unit; /* unit number */
190 u_int flags; /* copy of device flags */
194 * The high level of the driver never reads status registers directly
195 * because there would be too many side effects to handle conveniently.
196 * Instead, it reads copies of the registers stored here by the
199 u_char last_modem_status; /* last MSR read by intr handler */
200 u_char prev_modem_status; /* last MSR handled by high level */
202 u_char *ibuf; /* start of input buffer */
203 u_char *ibufend; /* end of input buffer */
204 u_char *ibufold; /* old input buffer, to be freed */
205 u_char *ihighwater; /* threshold in input buffer */
206 u_char *iptr; /* next free spot in input buffer */
207 int ibufsize; /* size of ibuf (not include error bytes) */
208 int ierroff; /* offset of error bytes in ibuf */
210 struct lbq obufq; /* head of queue of output buffers */
211 struct lbq obufs[2]; /* output buffers */
214 bus_space_handle_t bsh;
216 Port_t data_port; /* i/o ports */
222 Port_t modem_ctl_port;
223 Port_t line_status_port;
224 Port_t modem_status_port;
226 struct tty *tp; /* cross reference */
228 struct pps_state pps;
234 u_long bytes_in; /* statistics */
236 u_int delta_error_counts[CE_NTYPES];
237 u_long error_counts[CE_NTYPES];
241 struct resource *irqres;
242 struct resource *ioportres;
247 * Data area for output buffers. Someday we should build the output
248 * buffer queue without copying data.
255 static int espattach(struct com_s *com, Port_t esp_port);
258 static void combreak(struct tty *tp, int sig);
259 static timeout_t siobusycheck;
260 static u_int siodivisor(u_long rclk, speed_t speed);
261 static void comclose(struct tty *tp);
262 static int comopen(struct tty *tp, struct cdev *dev);
263 static void sioinput(struct com_s *com);
264 static void siointr1(struct com_s *com);
265 static int siointr(void *arg);
266 static int commodem(struct tty *tp, int sigon, int sigoff);
267 static int comparam(struct tty *tp, struct termios *t);
268 static void siopoll(void *);
269 static void siosettimeout(void);
270 static int siosetwater(struct com_s *com, speed_t speed);
271 static void comstart(struct tty *tp);
272 static void comstop(struct tty *tp, int rw);
273 static timeout_t comwakeup;
275 char sio_driver_name[] = "sio";
276 static struct mtx sio_lock;
277 static int sio_inited;
279 /* table and macro for fast conversion from a unit number to its com struct */
280 devclass_t sio_devclass;
281 #define com_addr(unit) ((struct com_s *) \
282 devclass_get_softc(sio_devclass, unit)) /* XXX */
285 static volatile speed_t comdefaultrate = CONSPEED;
286 static u_long comdefaultrclk = DEFAULT_RCLK;
287 SYSCTL_ULONG(_machdep, OID_AUTO, conrclk, CTLFLAG_RW, &comdefaultrclk, 0, "");
288 static speed_t gdbdefaultrate = GDBSPEED;
289 SYSCTL_UINT(_machdep, OID_AUTO, gdbspeed, CTLFLAG_RW,
290 &gdbdefaultrate, GDBSPEED, "");
291 static u_int com_events; /* input chars + weighted output completions */
292 static Port_t siocniobase;
293 static int siocnunit = -1;
294 static void *sio_slow_ih;
295 static void *sio_fast_ih;
296 static int sio_timeout;
297 static int sio_timeouts_until_log;
298 static struct callout_handle sio_timeout_handle
299 = CALLOUT_HANDLE_INITIALIZER(&sio_timeout_handle);
300 static int sio_numunits;
303 static Port_t siogdbiobase = 0;
307 /* XXX configure this properly. */
308 /* XXX quite broken for new-bus. */
309 static Port_t likely_com_ports[] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8, };
310 static Port_t likely_esp_ports[] = { 0x140, 0x180, 0x280, 0 };
314 * handle sysctl read/write requests for console speed
316 * In addition to setting comdefaultrate for I/O through /dev/console,
317 * also set the initial and lock values for the /dev/ttyXX device
318 * if there is one associated with the console. Finally, if the /dev/tty
319 * device has already been open, change the speed on the open running port
324 sysctl_machdep_comdefaultrate(SYSCTL_HANDLER_ARGS)
331 newspeed = comdefaultrate;
333 error = sysctl_handle_opaque(oidp, &newspeed, sizeof newspeed, req);
334 if (error || !req->newptr)
337 comdefaultrate = newspeed;
339 if (comconsole < 0) /* serial console not selected? */
342 com = com_addr(comconsole);
351 * set the initial and lock rates for /dev/ttydXX and /dev/cuaXX
352 * (note, the lock rates really are boolean -- if non-zero, disallow
355 tp->t_init_in.c_ispeed = tp->t_init_in.c_ospeed =
356 tp->t_lock_in.c_ispeed = tp->t_lock_in.c_ospeed =
357 tp->t_init_out.c_ispeed = tp->t_init_out.c_ospeed =
358 tp->t_lock_out.c_ispeed = tp->t_lock_out.c_ospeed = comdefaultrate;
360 if (tp->t_state & TS_ISOPEN) {
361 tp->t_termios.c_ispeed =
362 tp->t_termios.c_ospeed = comdefaultrate;
364 error = comparam(tp, &tp->t_termios);
370 SYSCTL_PROC(_machdep, OID_AUTO, conspeed, CTLTYPE_INT | CTLFLAG_RW,
371 0, 0, sysctl_machdep_comdefaultrate, "I", "");
372 TUNABLE_INT("machdep.conspeed", __DEVOLATILE(int *, &comdefaultrate));
374 #define SET_FLAG(dev, bit) device_set_flags(dev, device_get_flags(dev) | (bit))
375 #define CLR_FLAG(dev, bit) device_set_flags(dev, device_get_flags(dev) & ~(bit))
378 * Unload the driver and clear the table.
379 * XXX this is mostly wrong.
381 * This is usually called when the card is ejected, but
382 * can be caused by a kldunload of a controller driver.
383 * The idea is to reset the driver's view of the device
384 * and ensure that any driver entry points such as
385 * read and write do not hang.
388 siodetach(device_t dev)
392 com = (struct com_s *) device_get_softc(dev);
394 device_printf(dev, "NULL com in siounload\n");
401 bus_teardown_intr(dev, com->irqres, com->cookie);
402 bus_release_resource(dev, SYS_RES_IRQ, 0, com->irqres);
405 bus_release_resource(dev, SYS_RES_IOPORT, com->ioportrid,
407 if (com->ibuf != NULL)
408 free(com->ibuf, M_DEVBUF);
410 device_set_softc(dev, NULL);
416 sioprobe(dev, xrid, rclk, noprobe)
423 static bool_t already_init;
432 intrmask_t irqmap[4];
437 u_int flags = device_get_flags(dev);
439 struct resource *port;
442 port = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid,
443 0, ~0, IO_COMSIZE, RF_ACTIVE);
447 com = malloc(sizeof(*com), M_DEVBUF, M_NOWAIT | M_ZERO);
449 bus_release_resource(dev, SYS_RES_IOPORT, rid, port);
452 device_set_softc(dev, com);
453 com->bst = rman_get_bustag(port);
454 com->bsh = rman_get_bushandle(port);
459 while (sio_inited != 2)
460 if (atomic_cmpset_int(&sio_inited, 0, 1)) {
461 mtx_init(&sio_lock, sio_driver_name, NULL,
463 MTX_SPIN | MTX_QUIET : MTX_SPIN);
464 atomic_store_rel_int(&sio_inited, 2);
469 * XXX this is broken - when we are first called, there are no
470 * previously configured IO ports. We could hard code
471 * 0x3f8, 0x2f8, 0x3e8, 0x2e8 etc but that's probably worse.
472 * This code has been doing nothing since the conversion since
473 * "count" is zero the first time around.
477 * Turn off MCR_IENABLE for all likely serial ports. An unused
478 * port with its MCR_IENABLE gate open will inhibit interrupts
479 * from any used port that shares the interrupt vector.
480 * XXX the gate enable is elsewhere for some multiports.
483 int count, i, xioport;
485 devclass_get_devices(sio_devclass, &devs, &count);
486 for (i = 0; i < count; i++) {
488 if (device_is_enabled(xdev) &&
489 bus_get_resource(xdev, SYS_RES_IOPORT, 0, &xioport,
491 outb(xioport + com_mcr, 0);
498 if (COM_LLCONSOLE(flags)) {
499 printf("sio%d: reserved for low-level i/o\n",
500 device_get_unit(dev));
501 bus_release_resource(dev, SYS_RES_IOPORT, rid, port);
502 device_set_softc(dev, NULL);
508 * If the device is on a multiport card and has an AST/4
509 * compatible interrupt control register, initialize this
510 * register and prepare to leave MCR_IENABLE clear in the mcr.
511 * Otherwise, prepare to set MCR_IENABLE in the mcr.
512 * Point idev to the device struct giving the correct id_irq.
513 * This is the struct for the master device if there is one.
516 mcr_image = MCR_IENABLE;
518 if (COM_ISMULTIPORT(flags)) {
522 idev = devclass_get_device(sio_devclass, COM_MPMASTER(flags));
524 printf("sio%d: master device %d not configured\n",
525 device_get_unit(dev), COM_MPMASTER(flags));
528 if (!COM_NOTAST4(flags)) {
529 if (bus_get_resource(idev, SYS_RES_IOPORT, 0, &io,
532 if (bus_get_resource(idev, SYS_RES_IRQ, 0,
534 outb(xiobase + com_scr, 0x80);
536 outb(xiobase + com_scr, 0);
541 #endif /* COM_MULTIPORT */
542 if (bus_get_resource(idev, SYS_RES_IRQ, 0, NULL, NULL) != 0)
545 bzero(failures, sizeof failures);
546 iobase = rman_get_start(port);
549 * We don't want to get actual interrupts, just masked ones.
550 * Interrupts from this line should already be masked in the ICU,
551 * but mask them in the processor as well in case there are some
552 * (misconfigured) shared interrupts.
554 mtx_lock_spin(&sio_lock);
558 * For the TI16754 chips, set prescaler to 1 (4 is often the
559 * default after-reset value) as otherwise it's impossible to
560 * get highest baudrates.
562 if (COM_TI16754(flags)) {
565 cfcr = sio_getreg(com, com_cfcr);
566 sio_setreg(com, com_cfcr, CFCR_EFR_ENABLE);
567 efr = sio_getreg(com, com_efr);
568 /* Unlock extended features to turn off prescaler. */
569 sio_setreg(com, com_efr, efr | EFR_EFE);
571 sio_setreg(com, com_cfcr, (cfcr != CFCR_EFR_ENABLE) ? cfcr : 0);
572 /* Turn off prescaler. */
573 sio_setreg(com, com_mcr,
574 sio_getreg(com, com_mcr) & ~MCR_PRESCALE);
575 sio_setreg(com, com_cfcr, CFCR_EFR_ENABLE);
576 sio_setreg(com, com_efr, efr);
577 sio_setreg(com, com_cfcr, cfcr);
581 * Initialize the speed and the word size and wait long enough to
582 * drain the maximum of 16 bytes of junk in device output queues.
583 * The speed is undefined after a master reset and must be set
584 * before relying on anything related to output. There may be
585 * junk after a (very fast) soft reboot and (apparently) after
587 * XXX what about the UART bug avoided by waiting in comparam()?
588 * We don't want to to wait long enough to drain at 2 bps.
590 if (iobase == siocniobase)
591 DELAY((16 + 1) * 1000000 / (comdefaultrate / 10));
593 sio_setreg(com, com_cfcr, CFCR_DLAB | CFCR_8BITS);
594 divisor = siodivisor(rclk, SIO_TEST_SPEED);
595 sio_setreg(com, com_dlbl, divisor & 0xff);
596 sio_setreg(com, com_dlbh, divisor >> 8);
597 sio_setreg(com, com_cfcr, CFCR_8BITS);
598 DELAY((16 + 1) * 1000000 / (SIO_TEST_SPEED / 10));
602 * Enable the interrupt gate and disable device interrupts. This
603 * should leave the device driving the interrupt line low and
604 * guarantee an edge trigger if an interrupt can be generated.
607 sio_setreg(com, com_mcr, mcr_image);
608 sio_setreg(com, com_ier, 0);
609 DELAY(1000); /* XXX */
610 irqmap[0] = isa_irq_pending();
613 * Attempt to set loopback mode so that we can send a null byte
614 * without annoying any external device.
617 sio_setreg(com, com_mcr, mcr_image | MCR_LOOPBACK);
620 * Attempt to generate an output interrupt. On 8250's, setting
621 * IER_ETXRDY generates an interrupt independent of the current
622 * setting and independent of whether the THR is empty. On 16450's,
623 * setting IER_ETXRDY generates an interrupt independent of the
624 * current setting. On 16550A's, setting IER_ETXRDY only
625 * generates an interrupt when IER_ETXRDY is not already set.
627 sio_setreg(com, com_ier, IER_ETXRDY);
630 * On some 16x50 incompatibles, setting IER_ETXRDY doesn't generate
631 * an interrupt. They'd better generate one for actually doing
632 * output. Loopback may be broken on the same incompatibles but
633 * it's unlikely to do more than allow the null byte out.
635 sio_setreg(com, com_data, 0);
636 if (iobase == siocniobase)
637 DELAY((1 + 2) * 1000000 / (comdefaultrate / 10));
639 DELAY((1 + 2) * 1000000 / (SIO_TEST_SPEED / 10));
642 * Turn off loopback mode so that the interrupt gate works again
643 * (MCR_IENABLE was hidden). This should leave the device driving
644 * an interrupt line high. It doesn't matter if the interrupt
645 * line oscillates while we are not looking at it, since interrupts
649 sio_setreg(com, com_mcr, mcr_image);
652 * It seems my Xircom CBEM56G Cardbus modem wants to be reset
653 * to 8 bits *again*, or else probe test 0 will fail.
654 * gwk@sgi.com, 4/19/2001
656 sio_setreg(com, com_cfcr, CFCR_8BITS);
659 * Some PCMCIA cards (Palido 321s, DC-1S, ...) have the "TXRDY bug",
660 * so we probe for a buggy IIR_TXRDY implementation even in the
661 * noprobe case. We don't probe for it in the !noprobe case because
662 * noprobe is always set for PCMCIA cards and the problem is not
663 * known to affect any other cards.
666 /* Read IIR a few times. */
667 for (fn = 0; fn < 2; fn ++) {
669 failures[6] = sio_getreg(com, com_iir);
672 /* IIR_TXRDY should be clear. Is it? */
674 if (failures[6] & IIR_TXRDY) {
676 * No. We seem to have the bug. Does our fix for
679 sio_setreg(com, com_ier, 0);
680 if (sio_getreg(com, com_iir) & IIR_NOPEND) {
681 /* Yes. We discovered the TXRDY bug! */
682 SET_FLAG(dev, COM_C_IIR_TXRDYBUG);
684 /* No. Just fail. XXX */
686 sio_setreg(com, com_mcr, 0);
690 CLR_FLAG(dev, COM_C_IIR_TXRDYBUG);
692 sio_setreg(com, com_ier, 0);
693 sio_setreg(com, com_cfcr, CFCR_8BITS);
694 mtx_unlock_spin(&sio_lock);
695 bus_release_resource(dev, SYS_RES_IOPORT, rid, port);
696 if (iobase == siocniobase)
699 * XXX: Since we don't return 0, we shouldn't be relying on
700 * the softc that we set to persist to the call to attach
701 * since other probe routines may be called, and the malloc
702 * here causes subr_bus to not allocate anything for the
703 * other probes. Instead, this softc is preserved and other
704 * probe routines can corrupt it.
707 device_set_softc(dev, NULL);
710 return (result == 0 ? BUS_PROBE_DEFAULT + 1 : result);
715 * o the CFCR, IER and MCR in UART hold the values written to them
716 * (the values happen to be all distinct - this is good for
717 * avoiding false positive tests from bus echoes).
718 * o an output interrupt is generated and its vector is correct.
719 * o the interrupt goes away when the IIR in the UART is read.
722 failures[0] = sio_getreg(com, com_cfcr) - CFCR_8BITS;
723 failures[1] = sio_getreg(com, com_ier) - IER_ETXRDY;
724 failures[2] = sio_getreg(com, com_mcr) - mcr_image;
725 DELAY(10000); /* Some internal modems need this time */
726 irqmap[1] = isa_irq_pending();
727 failures[4] = (sio_getreg(com, com_iir) & IIR_IMASK) - IIR_TXRDY;
728 DELAY(1000); /* XXX */
729 irqmap[2] = isa_irq_pending();
730 failures[6] = (sio_getreg(com, com_iir) & IIR_IMASK) - IIR_NOPEND;
733 * Turn off all device interrupts and check that they go off properly.
734 * Leave MCR_IENABLE alone. For ports without a master port, it gates
735 * the OUT2 output of the UART to
736 * the ICU input. Closing the gate would give a floating ICU input
737 * (unless there is another device driving it) and spurious interrupts.
738 * (On the system that this was first tested on, the input floats high
739 * and gives a (masked) interrupt as soon as the gate is closed.)
741 sio_setreg(com, com_ier, 0);
742 sio_setreg(com, com_cfcr, CFCR_8BITS); /* dummy to avoid bus echo */
743 failures[7] = sio_getreg(com, com_ier);
744 DELAY(1000); /* XXX */
745 irqmap[3] = isa_irq_pending();
746 failures[9] = (sio_getreg(com, com_iir) & IIR_IMASK) - IIR_NOPEND;
748 mtx_unlock_spin(&sio_lock);
750 irqs = irqmap[1] & ~irqmap[0];
751 if (bus_get_resource(idev, SYS_RES_IRQ, 0, &xirq, NULL) == 0 &&
752 ((1 << xirq) & irqs) == 0) {
754 "sio%d: configured irq %ld not in bitmap of probed irqs %#x\n",
755 device_get_unit(dev), xirq, irqs);
757 "sio%d: port may not be enabled\n",
758 device_get_unit(dev));
761 printf("sio%d: irq maps: %#x %#x %#x %#x\n",
762 device_get_unit(dev),
763 irqmap[0], irqmap[1], irqmap[2], irqmap[3]);
766 for (fn = 0; fn < sizeof failures; ++fn)
768 sio_setreg(com, com_mcr, 0);
771 printf("sio%d: probe failed test(s):",
772 device_get_unit(dev));
773 for (fn = 0; fn < sizeof failures; ++fn)
780 bus_release_resource(dev, SYS_RES_IOPORT, rid, port);
781 if (iobase == siocniobase)
784 * XXX: Since we don't return 0, we shouldn't be relying on the softc
785 * that we set to persist to the call to attach since other probe
786 * routines may be called, and the malloc here causes subr_bus to not
787 * allocate anything for the other probes. Instead, this softc is
788 * preserved and other probe routines can corrupt it.
791 device_set_softc(dev, NULL);
794 return (result == 0 ? BUS_PROBE_DEFAULT + 1 : result);
799 espattach(com, esp_port)
807 * Check the ESP-specific I/O port to see if we're an ESP
808 * card. If not, return failure immediately.
810 if ((inb(esp_port) & 0xf3) == 0) {
811 printf(" port 0x%x is not an ESP board?\n", esp_port);
816 * We've got something that claims to be a Hayes ESP card.
820 /* Get the dip-switch configuration */
821 outb(esp_port + ESP_CMD1, ESP_GETDIPS);
822 dips = inb(esp_port + ESP_STATUS1);
825 * Bits 0,1 of dips say which COM port we are.
827 if (rman_get_start(com->ioportres) == likely_com_ports[dips & 0x03])
830 printf(" esp_port has com %d\n", dips & 0x03);
835 * Check for ESP version 2.0 or later: bits 4,5,6 = 010.
837 outb(esp_port + ESP_CMD1, ESP_GETTEST);
838 val = inb(esp_port + ESP_STATUS1); /* clear reg 1 */
839 val = inb(esp_port + ESP_STATUS2);
840 if ((val & 0x70) < 0x20) {
841 printf("-old (%o)", val & 0x70);
846 * Check for ability to emulate 16550: bit 7 == 1
848 if ((dips & 0x80) == 0) {
854 * Okay, we seem to be a Hayes ESP card. Whee.
857 com->esp_port = esp_port;
863 sioattach(dev, xrid, rclk)
876 struct resource *port;
882 port = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid,
883 0, ~0, IO_COMSIZE, RF_ACTIVE);
887 iobase = rman_get_start(port);
888 unit = device_get_unit(dev);
889 com = device_get_softc(dev);
890 flags = device_get_flags(dev);
892 if (unit >= sio_numunits)
893 sio_numunits = unit + 1;
895 * sioprobe() has initialized the device registers as follows:
896 * o cfcr = CFCR_8BITS.
897 * It is most important that CFCR_DLAB is off, so that the
898 * data port is not hidden when we enable interrupts.
900 * Interrupts are only enabled when the line is open.
901 * o mcr = MCR_IENABLE, or 0 if the port has AST/4 compatible
902 * interrupt control register or the config specifies no irq.
903 * Keeping MCR_DTR and MCR_RTS off might stop the external
904 * device from sending before we are ready.
906 bzero(com, sizeof *com);
908 com->ioportres = port;
909 com->ioportrid = rid;
910 com->bst = rman_get_bustag(port);
911 com->bsh = rman_get_bushandle(port);
912 com->cfcr_image = CFCR_8BITS;
913 com->loses_outints = COM_LOSESOUTINTS(flags) != 0;
914 com->no_irq = bus_get_resource(dev, SYS_RES_IRQ, 0, NULL, NULL) != 0;
915 com->tx_fifo_size = 1;
916 com->obufs[0].l_head = com->obuf1;
917 com->obufs[1].l_head = com->obuf2;
919 com->data_port = iobase + com_data;
920 com->int_ctl_port = iobase + com_ier;
921 com->int_id_port = iobase + com_iir;
922 com->modem_ctl_port = iobase + com_mcr;
923 com->mcr_image = inb(com->modem_ctl_port);
924 com->line_status_port = iobase + com_lsr;
925 com->modem_status_port = iobase + com_msr;
927 tp = com->tp = ttyalloc();
928 tp->t_oproc = comstart;
929 tp->t_param = comparam;
930 tp->t_stop = comstop;
931 tp->t_modem = commodem;
932 tp->t_break = combreak;
933 tp->t_close = comclose;
934 tp->t_open = comopen;
941 if (unit == comconsole)
942 ttyconsolemode(tp, comdefaultrate);
943 error = siosetwater(com, tp->t_init_in.c_ispeed);
944 mtx_unlock_spin(&sio_lock);
947 * Leave i/o resources allocated if this is a `cn'-level
948 * console, so that other devices can't snarf them.
950 if (iobase != siocniobase)
951 bus_release_resource(dev, SYS_RES_IOPORT, rid, port);
955 /* attempt to determine UART type */
956 printf("sio%d: type", unit);
958 if (!COM_ISMULTIPORT(flags) &&
959 !COM_IIR_TXRDYBUG(flags) && !COM_NOSCR(flags)) {
964 scr = sio_getreg(com, com_scr);
965 sio_setreg(com, com_scr, 0xa5);
966 scr1 = sio_getreg(com, com_scr);
967 sio_setreg(com, com_scr, 0x5a);
968 scr2 = sio_getreg(com, com_scr);
969 sio_setreg(com, com_scr, scr);
970 if (scr1 != 0xa5 || scr2 != 0x5a) {
971 printf(" 8250 or not responding");
972 goto determined_type;
975 sio_setreg(com, com_fifo, FIFO_ENABLE | FIFO_RX_HIGH);
977 switch (inb(com->int_id_port) & IIR_FIFO_MASK) {
988 if (COM_NOFIFO(flags)) {
989 printf(" 16550A fifo disabled");
993 if (COM_ST16650A(flags)) {
995 com->st16650a = TRUE;
996 com->tx_fifo_size = 32;
999 if (COM_TI16754(flags)) {
1001 com->tx_fifo_size = 64;
1006 for (espp = likely_esp_ports; *espp != 0; espp++)
1007 if (espattach(com, *espp)) {
1008 com->tx_fifo_size = 1024;
1014 com->tx_fifo_size = COM_FIFOSIZE(flags);
1015 if (com->tx_fifo_size == 0)
1016 com->tx_fifo_size = 16;
1018 printf(" lookalike with %u bytes FIFO",
1025 * Set 16550 compatibility mode.
1026 * We don't use the ESP_MODE_SCALE bit to increase the
1027 * fifo trigger levels because we can't handle large
1029 * XXX flow control should be set in comparam(), not here.
1031 outb(com->esp_port + ESP_CMD1, ESP_SETMODE);
1032 outb(com->esp_port + ESP_CMD2, ESP_MODE_RTS | ESP_MODE_FIFO);
1034 /* Set RTS/CTS flow control. */
1035 outb(com->esp_port + ESP_CMD1, ESP_SETFLOWTYPE);
1036 outb(com->esp_port + ESP_CMD2, ESP_FLOW_RTS);
1037 outb(com->esp_port + ESP_CMD2, ESP_FLOW_CTS);
1039 /* Set flow-control levels. */
1040 outb(com->esp_port + ESP_CMD1, ESP_SETRXFLOW);
1041 outb(com->esp_port + ESP_CMD2, HIBYTE(768));
1042 outb(com->esp_port + ESP_CMD2, LOBYTE(768));
1043 outb(com->esp_port + ESP_CMD2, HIBYTE(512));
1044 outb(com->esp_port + ESP_CMD2, LOBYTE(512));
1046 #endif /* COM_ESP */
1047 sio_setreg(com, com_fifo, 0);
1050 #ifdef COM_MULTIPORT
1051 if (COM_ISMULTIPORT(flags)) {
1054 com->multiport = TRUE;
1055 printf(" (multiport");
1056 if (unit == COM_MPMASTER(flags))
1059 masterdev = devclass_get_device(sio_devclass,
1060 COM_MPMASTER(flags));
1061 com->no_irq = (masterdev == NULL || bus_get_resource(masterdev,
1062 SYS_RES_IRQ, 0, NULL, NULL) != 0);
1064 #endif /* COM_MULTIPORT */
1065 if (unit == comconsole)
1066 printf(", console");
1067 if (COM_IIR_TXRDYBUG(flags))
1068 printf(" with a buggy IIR_TXRDY implementation");
1071 if (sio_fast_ih == NULL) {
1072 swi_add(&tty_intr_event, "sio", siopoll, NULL, SWI_TTY, 0,
1074 swi_add(&clk_intr_event, "sio", siopoll, NULL, SWI_CLOCK, 0,
1079 com->pps.ppscap = PPS_CAPTUREASSERT | PPS_CAPTURECLEAR;
1080 tp->t_pps = &com->pps;
1082 if (COM_PPSCTS(flags))
1083 com->pps_bit = MSR_CTS;
1085 com->pps_bit = MSR_DCD;
1086 pps_init(&com->pps);
1089 com->irqres = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, RF_ACTIVE);
1091 ret = bus_setup_intr(dev, com->irqres,
1096 ret = bus_setup_intr(dev,
1097 com->irqres, INTR_TYPE_TTY,
1098 NULL, (driver_intr_t *)siointr, com, &com->cookie);
1100 device_printf(dev, "unable to activate interrupt in fast mode - using normal mode\n");
1103 device_printf(dev, "could not activate interrupt\n");
1106 * Enable interrupts for early break-to-debugger support
1109 if (ret == 0 && unit == comconsole)
1110 outb(siocniobase + com_ier, IER_ERXRDY | IER_ERLS |
1115 /* We're ready, open the doors... */
1116 ttycreate(tp, TS_CALLOUT, "d%r", unit);
1122 comopen(struct tty *tp, struct cdev *dev)
1128 com->poll = com->no_irq;
1129 com->poll_output = com->loses_outints;
1132 * (Re)enable and drain fifos.
1134 * Certain SMC chips cause problems if the fifos
1135 * are enabled while input is ready. Turn off the
1136 * fifo if necessary to clear the input. We test
1137 * the input ready bit after enabling the fifos
1138 * since we've already enabled them in comparam()
1139 * and to handle races between enabling and fresh
1142 for (i = 0; i < 500; i++) {
1143 sio_setreg(com, com_fifo,
1144 FIFO_RCV_RST | FIFO_XMT_RST
1147 * XXX the delays are for superstitious
1148 * historical reasons. It must be less than
1149 * the character time at the maximum
1150 * supported speed (87 usec at 115200 bps
1151 * 8N1). Otherwise we might loop endlessly
1152 * if data is streaming in. We used to use
1153 * delays of 100. That usually worked
1154 * because DELAY(100) used to usually delay
1155 * for about 85 usec instead of 100.
1158 if (!(inb(com->line_status_port) & LSR_RXRDY))
1160 sio_setreg(com, com_fifo, 0);
1162 (void) inb(com->data_port);
1168 mtx_lock_spin(&sio_lock);
1169 (void) inb(com->line_status_port);
1170 (void) inb(com->data_port);
1171 com->prev_modem_status = com->last_modem_status
1172 = inb(com->modem_status_port);
1173 outb(com->int_ctl_port,
1174 IER_ERXRDY | IER_ERLS | IER_EMSC
1175 | (COM_IIR_TXRDYBUG(com->flags) ? 0 : IER_ETXRDY));
1176 mtx_unlock_spin(&sio_lock);
1178 /* XXX: should be generic ? */
1179 if (com->prev_modem_status & MSR_DCD || ISCALLOUT(dev))
1194 com->poll_output = FALSE;
1195 sio_setreg(com, com_cfcr, com->cfcr_image &= ~CFCR_SBREAK);
1199 * Leave interrupts enabled and don't clear DTR if this is the
1200 * console. This allows us to detect break-to-debugger events
1201 * while the console device is closed.
1203 if (com->unit != comconsole)
1206 sio_setreg(com, com_ier, 0);
1207 if (tp->t_cflag & HUPCL
1209 * XXX we will miss any carrier drop between here and the
1210 * next open. Perhaps we should watch DCD even when the
1211 * port is closed; it is not sufficient to check it at
1212 * the next open because it might go up and down while
1213 * we're not watching.
1216 && !(com->prev_modem_status & MSR_DCD)
1217 && !(tp->t_init_in.c_cflag & CLOCAL))
1218 || !(tp->t_state & TS_ISOPEN)) {
1219 (void)commodem(tp, 0, SER_DTR);
1220 ttydtrwaitstart(tp);
1225 * Disable fifos so that they are off after controlled
1226 * reboots. Some BIOSes fail to detect 16550s when the
1227 * fifos are enabled.
1229 sio_setreg(com, com_fifo, 0);
1231 tp->t_actout = FALSE;
1232 wakeup(&tp->t_actout);
1233 wakeup(TSA_CARR_ON(tp)); /* restart any wopeners */
1245 com = (struct com_s *)chan;
1248 * Clear TS_BUSY if low-level output is complete.
1249 * spl locking is sufficient because siointr1() does not set CS_BUSY.
1250 * If siointr1() clears CS_BUSY after we look at it, then we'll get
1251 * called again. Reading the line status port outside of siointr1()
1252 * is safe because CS_BUSY is clear so there are no output interrupts
1256 if (com->state & CS_BUSY)
1257 com->extra_state &= ~CSE_BUSYCHECK; /* False alarm. */
1258 else if ((inb(com->line_status_port) & (LSR_TSRE | LSR_TXRDY))
1259 == (LSR_TSRE | LSR_TXRDY)) {
1260 com->tp->t_state &= ~TS_BUSY;
1262 com->extra_state &= ~CSE_BUSYCHECK;
1264 timeout(siobusycheck, com, hz / 100);
1269 siodivisor(rclk, speed)
1279 #if UINT_MAX > (ULONG_MAX - 1) / 8
1280 if (speed > (ULONG_MAX - 1) / 8)
1283 divisor = (rclk / (8UL * speed) + 1) / 2;
1284 if (divisor == 0 || divisor >= 65536)
1286 actual_speed = rclk / (16UL * divisor);
1288 /* 10 times error in percent: */
1289 error = ((actual_speed - (long)speed) * 2000 / (long)speed + 1) / 2;
1291 /* 3.0% maximum error tolerance: */
1292 if (error < -30 || error > 30)
1299 * Call this function with the sio_lock mutex held. It will return with the
1314 if (!(tp->t_state & TS_ISOPEN) || !(tp->t_cflag & CREAD)) {
1315 com_events -= (com->iptr - com->ibuf);
1316 com->iptr = com->ibuf;
1319 if (tp->t_state & TS_CAN_BYPASS_L_RINT) {
1321 * Avoid the grotesquely inefficient lineswitch routine
1322 * (ttyinput) in "raw" mode. It usually takes about 450
1323 * instructions (that's without canonical processing or echo!).
1324 * slinput is reasonably fast (usually 40 instructions plus
1329 * This may look odd, but it is using save-and-enable
1330 * semantics instead of the save-and-disable semantics
1331 * that are used everywhere else.
1333 mtx_unlock_spin(&sio_lock);
1334 incc = com->iptr - buf;
1335 if (tp->t_rawq.c_cc + incc > tp->t_ihiwat
1336 && (com->state & CS_RTS_IFLOW
1337 || tp->t_iflag & IXOFF)
1338 && !(tp->t_state & TS_TBLOCK))
1340 com->delta_error_counts[CE_TTY_BUF_OVERFLOW]
1341 += b_to_q((char *)buf, incc, &tp->t_rawq);
1345 tp->t_rawcc += incc;
1347 if (tp->t_state & TS_TTSTOP
1348 && (tp->t_iflag & IXANY
1349 || tp->t_cc[VSTART] == tp->t_cc[VSTOP])) {
1350 tp->t_state &= ~TS_TTSTOP;
1351 tp->t_lflag &= ~FLUSHO;
1354 mtx_lock_spin(&sio_lock);
1355 } while (buf < com->iptr);
1359 * This may look odd, but it is using save-and-enable
1360 * semantics instead of the save-and-disable semantics
1361 * that are used everywhere else.
1363 mtx_unlock_spin(&sio_lock);
1364 line_status = buf[com->ierroff];
1367 & (LSR_BI | LSR_FE | LSR_OE | LSR_PE)) {
1368 if (line_status & LSR_BI)
1369 recv_data |= TTY_BI;
1370 if (line_status & LSR_FE)
1371 recv_data |= TTY_FE;
1372 if (line_status & LSR_OE)
1373 recv_data |= TTY_OE;
1374 if (line_status & LSR_PE)
1375 recv_data |= TTY_PE;
1377 ttyld_rint(tp, recv_data);
1378 mtx_lock_spin(&sio_lock);
1379 } while (buf < com->iptr);
1381 com_events -= (com->iptr - com->ibuf);
1382 com->iptr = com->ibuf;
1385 * There is now room for another low-level buffer full of input,
1386 * so enable RTS if it is now disabled and there is room in the
1387 * high-level buffer.
1389 if ((com->state & CS_RTS_IFLOW) && !(com->mcr_image & MCR_RTS) &&
1390 !(tp->t_state & TS_TBLOCK))
1391 outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS);
1400 #ifndef COM_MULTIPORT
1401 com = (struct com_s *)arg;
1403 mtx_lock_spin(&sio_lock);
1405 mtx_unlock_spin(&sio_lock);
1406 #else /* COM_MULTIPORT */
1407 bool_t possibly_more_intrs;
1411 * Loop until there is no activity on any port. This is necessary
1412 * to get an interrupt edge more than to avoid another interrupt.
1413 * If the IRQ signal is just an OR of the IRQ signals from several
1414 * devices, then the edge from one may be lost because another is
1417 mtx_lock_spin(&sio_lock);
1419 possibly_more_intrs = FALSE;
1420 for (unit = 0; unit < sio_numunits; ++unit) {
1421 com = com_addr(unit);
1424 * would it work here, or be counter-productive?
1428 && (inb(com->int_id_port) & IIR_IMASK)
1431 possibly_more_intrs = TRUE;
1433 /* XXX COM_UNLOCK(); */
1435 } while (possibly_more_intrs);
1436 mtx_unlock_spin(&sio_lock);
1437 #endif /* COM_MULTIPORT */
1438 return(FILTER_HANDLED);
1441 static struct timespec siots[8];
1443 static int volatile siotsunit = -1;
1446 sysctl_siots(SYSCTL_HANDLER_ARGS)
1453 for (i = 1, tso = siotso; i < tso; i++) {
1454 delta = (long long)(siots[i].tv_sec - siots[i - 1].tv_sec) *
1456 (siots[i].tv_nsec - siots[i - 1].tv_nsec);
1457 len = sprintf(buf, "%lld\n", delta);
1458 if (delta >= 110000)
1459 len += sprintf(buf + len - 1, ": *** %ld.%09ld\n",
1460 (long)siots[i].tv_sec, siots[i].tv_nsec) - 1;
1462 buf[len - 1] = '\0';
1463 error = SYSCTL_OUT(req, buf, len);
1470 SYSCTL_PROC(_machdep, OID_AUTO, siots, CTLTYPE_STRING | CTLFLAG_RD,
1471 0, 0, sysctl_siots, "A", "sio timestamps");
1480 u_char modem_status;
1488 if (COM_IIR_TXRDYBUG(com->flags)) {
1489 int_ctl = inb(com->int_ctl_port);
1490 int_ctl_new = int_ctl;
1496 while (!com->gone) {
1497 if (com->pps.ppsparam.mode & PPS_CAPTUREBOTH) {
1498 modem_status = inb(com->modem_status_port);
1499 if ((modem_status ^ com->last_modem_status) &
1501 pps_capture(&com->pps);
1502 pps_event(&com->pps,
1503 (modem_status & com->pps_bit) ?
1504 PPS_CAPTUREASSERT : PPS_CAPTURECLEAR);
1507 line_status = inb(com->line_status_port);
1509 /* input event? (check first to help avoid overruns) */
1510 while (line_status & LSR_RCV_MASK) {
1511 /* break/unnattached error bits or real input? */
1512 if (!(line_status & LSR_RXRDY))
1515 recv_data = inb(com->data_port);
1517 if (com->unit == comconsole &&
1518 kdb_alt_break(recv_data, &com->alt_brk_state) != 0)
1521 if (line_status & (LSR_BI | LSR_FE | LSR_PE)) {
1523 * Don't store BI if IGNBRK or FE/PE if IGNPAR.
1524 * Otherwise, push the work to a higher level
1525 * (to handle PARMRK) if we're bypassing.
1526 * Otherwise, convert BI/FE and PE+INPCK to 0.
1528 * This makes bypassing work right in the
1529 * usual "raw" case (IGNBRK set, and IGNPAR
1532 * Note: BI together with FE/PE means just BI.
1534 if (line_status & LSR_BI) {
1536 if (com->unit == comconsole) {
1542 || com->tp->t_iflag & IGNBRK)
1546 || com->tp->t_iflag & IGNPAR)
1549 if (com->tp->t_state & TS_CAN_BYPASS_L_RINT
1550 && (line_status & (LSR_BI | LSR_FE)
1551 || com->tp->t_iflag & INPCK))
1555 if (com->tp != NULL &&
1556 com->tp->t_hotchar != 0 && recv_data == com->tp->t_hotchar)
1557 swi_sched(sio_fast_ih, 0);
1559 if (ioptr >= com->ibufend)
1560 CE_RECORD(com, CE_INTERRUPT_BUF_OVERFLOW);
1562 if (com->tp != NULL && com->tp->t_do_timestamp)
1563 microtime(&com->tp->t_timestamp);
1565 swi_sched(sio_slow_ih, SWI_DELAY);
1566 #if 0 /* for testing input latency vs efficiency */
1567 if (com->iptr - com->ibuf == 8)
1568 swi_sched(sio_fast_ih, 0);
1570 ioptr[0] = recv_data;
1571 ioptr[com->ierroff] = line_status;
1572 com->iptr = ++ioptr;
1573 if (ioptr == com->ihighwater
1574 && com->state & CS_RTS_IFLOW)
1575 outb(com->modem_ctl_port,
1576 com->mcr_image &= ~MCR_RTS);
1577 if (line_status & LSR_OE)
1578 CE_RECORD(com, CE_OVERRUN);
1581 if (line_status & LSR_TXRDY
1582 && com->state >= (CS_BUSY | CS_TTGO | CS_ODEVREADY))
1586 * "& 0x7F" is to avoid the gcc-1.40 generating a slow
1587 * jump from the top of the loop to here
1589 line_status = inb(com->line_status_port) & 0x7F;
1592 /* modem status change? (always check before doing output) */
1593 modem_status = inb(com->modem_status_port);
1594 if (modem_status != com->last_modem_status) {
1596 * Schedule high level to handle DCD changes. Note
1597 * that we don't use the delta bits anywhere. Some
1598 * UARTs mess them up, and it's easy to remember the
1599 * previous bits and calculate the delta.
1601 com->last_modem_status = modem_status;
1602 if (!(com->state & CS_CHECKMSR)) {
1603 com_events += LOTS_OF_EVENTS;
1604 com->state |= CS_CHECKMSR;
1605 swi_sched(sio_fast_ih, 0);
1608 /* handle CTS change immediately for crisp flow ctl */
1609 if (com->state & CS_CTS_OFLOW) {
1610 if (modem_status & MSR_CTS)
1611 com->state |= CS_ODEVREADY;
1613 com->state &= ~CS_ODEVREADY;
1618 /* output queued and everything ready? */
1619 if (line_status & LSR_TXRDY
1620 && com->state >= (CS_BUSY | CS_TTGO | CS_ODEVREADY)) {
1621 ioptr = com->obufq.l_head;
1622 if (com->tx_fifo_size > 1 && com->unit != siotsunit) {
1625 ocount = com->obufq.l_tail - ioptr;
1626 if (ocount > com->tx_fifo_size)
1627 ocount = com->tx_fifo_size;
1628 com->bytes_out += ocount;
1630 outb(com->data_port, *ioptr++);
1631 while (--ocount != 0);
1633 outb(com->data_port, *ioptr++);
1635 if (com->unit == siotsunit
1636 && siotso < sizeof siots / sizeof siots[0])
1637 nanouptime(&siots[siotso++]);
1639 com->obufq.l_head = ioptr;
1640 if (COM_IIR_TXRDYBUG(com->flags))
1641 int_ctl_new = int_ctl | IER_ETXRDY;
1642 if (ioptr >= com->obufq.l_tail) {
1645 qp = com->obufq.l_next;
1646 qp->l_queued = FALSE;
1649 com->obufq.l_head = qp->l_head;
1650 com->obufq.l_tail = qp->l_tail;
1651 com->obufq.l_next = qp;
1653 /* output just completed */
1654 if (COM_IIR_TXRDYBUG(com->flags))
1655 int_ctl_new = int_ctl
1657 com->state &= ~CS_BUSY;
1659 if (!(com->state & CS_ODONE)) {
1660 com_events += LOTS_OF_EVENTS;
1661 com->state |= CS_ODONE;
1662 /* handle at high level ASAP */
1663 swi_sched(sio_fast_ih, 0);
1666 if (COM_IIR_TXRDYBUG(com->flags)
1667 && int_ctl != int_ctl_new)
1668 outb(com->int_ctl_port, int_ctl_new);
1672 #ifndef COM_MULTIPORT
1673 if ((inb(com->int_id_port) & IIR_IMASK) == IIR_NOPEND)
1674 #endif /* COM_MULTIPORT */
1679 /* software interrupt handler for SWI_TTY */
1681 siopoll(void *dummy)
1685 if (com_events == 0)
1688 for (unit = 0; unit < sio_numunits; ++unit) {
1693 com = com_addr(unit);
1697 if (tp == NULL || com->gone) {
1699 * Discard any events related to never-opened or
1700 * going-away devices.
1702 mtx_lock_spin(&sio_lock);
1703 incc = com->iptr - com->ibuf;
1704 com->iptr = com->ibuf;
1705 if (com->state & CS_CHECKMSR) {
1706 incc += LOTS_OF_EVENTS;
1707 com->state &= ~CS_CHECKMSR;
1710 mtx_unlock_spin(&sio_lock);
1713 if (com->iptr != com->ibuf) {
1714 mtx_lock_spin(&sio_lock);
1716 mtx_unlock_spin(&sio_lock);
1718 if (com->state & CS_CHECKMSR) {
1719 u_char delta_modem_status;
1721 mtx_lock_spin(&sio_lock);
1722 delta_modem_status = com->last_modem_status
1723 ^ com->prev_modem_status;
1724 com->prev_modem_status = com->last_modem_status;
1725 com_events -= LOTS_OF_EVENTS;
1726 com->state &= ~CS_CHECKMSR;
1727 mtx_unlock_spin(&sio_lock);
1728 if (delta_modem_status & MSR_DCD)
1730 com->prev_modem_status & MSR_DCD);
1732 if (com->state & CS_ODONE) {
1733 mtx_lock_spin(&sio_lock);
1734 com_events -= LOTS_OF_EVENTS;
1735 com->state &= ~CS_ODONE;
1736 mtx_unlock_spin(&sio_lock);
1737 if (!(com->state & CS_BUSY)
1738 && !(com->extra_state & CSE_BUSYCHECK)) {
1739 timeout(siobusycheck, com, hz / 100);
1740 com->extra_state |= CSE_BUSYCHECK;
1744 if (com_events == 0)
1747 if (com_events >= LOTS_OF_EVENTS)
1761 sio_setreg(com, com_cfcr, com->cfcr_image |= CFCR_SBREAK);
1763 sio_setreg(com, com_cfcr, com->cfcr_image &= ~CFCR_SBREAK);
1777 u_char efr_flowbits;
1784 /* check requested parameters */
1785 if (t->c_ispeed != (t->c_ospeed != 0 ? t->c_ospeed : tp->t_ospeed))
1787 divisor = siodivisor(com->rclk, t->c_ispeed);
1791 /* parameters are OK, convert them to the com struct and the device */
1793 if (t->c_ospeed == 0)
1794 (void)commodem(tp, 0, SER_DTR); /* hang up line */
1796 (void)commodem(tp, SER_DTR, 0);
1798 switch (cflag & CSIZE) {
1812 if (cflag & PARENB) {
1814 if (!(cflag & PARODD))
1822 * Use a fifo trigger level low enough so that the input
1823 * latency from the fifo is less than about 16 msec and
1824 * the total latency is less than about 30 msec. These
1825 * latencies are reasonable for humans. Serial comms
1826 * protocols shouldn't expect anything better since modem
1827 * latencies are larger.
1829 * The fifo trigger level cannot be set at RX_HIGH for high
1830 * speed connections without further work on reducing
1831 * interrupt disablement times in other parts of the system,
1832 * without producing silo overflow errors.
1834 com->fifo_image = com->unit == siotsunit ? 0
1835 : t->c_ispeed <= 4800
1836 ? FIFO_ENABLE : FIFO_ENABLE | FIFO_RX_MEDH;
1839 * The Hayes ESP card needs the fifo DMA mode bit set
1840 * in compatibility mode. If not, it will interrupt
1841 * for each character received.
1844 com->fifo_image |= FIFO_DMA_MODE;
1846 sio_setreg(com, com_fifo, com->fifo_image);
1850 * This returns with interrupts disabled so that we can complete
1851 * the speed change atomically. Keeping interrupts disabled is
1852 * especially important while com_data is hidden.
1854 (void) siosetwater(com, t->c_ispeed);
1856 sio_setreg(com, com_cfcr, cfcr | CFCR_DLAB);
1858 * Only set the divisor registers if they would change, since on
1859 * some 16550 incompatibles (UMC8669F), setting them while input
1860 * is arriving loses sync until data stops arriving.
1862 dlbl = divisor & 0xFF;
1863 if (sio_getreg(com, com_dlbl) != dlbl)
1864 sio_setreg(com, com_dlbl, dlbl);
1865 dlbh = divisor >> 8;
1866 if (sio_getreg(com, com_dlbh) != dlbh)
1867 sio_setreg(com, com_dlbh, dlbh);
1871 if (cflag & CRTS_IFLOW) {
1872 com->state |= CS_RTS_IFLOW;
1873 efr_flowbits |= EFR_AUTORTS;
1875 * If CS_RTS_IFLOW just changed from off to on, the change
1876 * needs to be propagated to MCR_RTS. This isn't urgent,
1877 * so do it later by calling comstart() instead of repeating
1878 * a lot of code from comstart() here.
1880 } else if (com->state & CS_RTS_IFLOW) {
1881 com->state &= ~CS_RTS_IFLOW;
1883 * CS_RTS_IFLOW just changed from on to off. Force MCR_RTS
1884 * on here, since comstart() won't do it later.
1886 outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS);
1890 * Set up state to handle output flow control.
1891 * XXX - worth handling MDMBUF (DCD) flow control at the lowest level?
1892 * Now has 10+ msec latency, while CTS flow has 50- usec latency.
1894 com->state |= CS_ODEVREADY;
1895 com->state &= ~CS_CTS_OFLOW;
1896 if (cflag & CCTS_OFLOW) {
1897 com->state |= CS_CTS_OFLOW;
1898 efr_flowbits |= EFR_AUTOCTS;
1899 if (!(com->last_modem_status & MSR_CTS))
1900 com->state &= ~CS_ODEVREADY;
1903 if (com->st16650a) {
1904 sio_setreg(com, com_lcr, LCR_EFR_ENABLE);
1905 sio_setreg(com, com_efr,
1906 (sio_getreg(com, com_efr)
1907 & ~(EFR_AUTOCTS | EFR_AUTORTS)) | efr_flowbits);
1909 sio_setreg(com, com_cfcr, com->cfcr_image = cfcr);
1911 /* XXX shouldn't call functions while intrs are disabled. */
1914 mtx_unlock_spin(&sio_lock);
1917 if (com->ibufold != NULL) {
1918 free(com->ibufold, M_DEVBUF);
1919 com->ibufold = NULL;
1925 * This function must be called with the sio_lock mutex released and will
1926 * return with it obtained.
1929 siosetwater(com, speed)
1939 * Make the buffer size large enough to handle a softtty interrupt
1940 * latency of about 2 ticks without loss of throughput or data
1941 * (about 3 ticks if input flow control is not used or not honoured,
1942 * but a bit less for CS5-CS7 modes).
1944 cp4ticks = speed / 10 / hz * 4;
1945 for (ibufsize = 128; ibufsize < cp4ticks;)
1947 if (ibufsize == com->ibufsize) {
1948 mtx_lock_spin(&sio_lock);
1953 * Allocate input buffer. The extra factor of 2 in the size is
1954 * to allow for an error byte for each input byte.
1956 ibuf = malloc(2 * ibufsize, M_DEVBUF, M_NOWAIT);
1958 mtx_lock_spin(&sio_lock);
1962 /* Initialize non-critical variables. */
1963 com->ibufold = com->ibuf;
1964 com->ibufsize = ibufsize;
1967 tp->t_ififosize = 2 * ibufsize;
1968 tp->t_ispeedwat = (speed_t)-1;
1969 tp->t_ospeedwat = (speed_t)-1;
1973 * Read current input buffer, if any. Continue with interrupts
1976 mtx_lock_spin(&sio_lock);
1977 if (com->iptr != com->ibuf)
1981 * Initialize critical variables, including input buffer watermarks.
1982 * The external device is asked to stop sending when the buffer
1983 * exactly reaches high water, or when the high level requests it.
1984 * The high level is notified immediately (rather than at a later
1985 * clock tick) when this watermark is reached.
1986 * The buffer size is chosen so the watermark should almost never
1988 * The low watermark is invisibly 0 since the buffer is always
1989 * emptied all at once.
1991 com->iptr = com->ibuf = ibuf;
1992 com->ibufend = ibuf + ibufsize;
1993 com->ierroff = ibufsize;
1994 com->ihighwater = ibuf + 3 * ibufsize / 4;
2009 mtx_lock_spin(&sio_lock);
2010 if (tp->t_state & TS_TTSTOP)
2011 com->state &= ~CS_TTGO;
2013 com->state |= CS_TTGO;
2014 if (tp->t_state & TS_TBLOCK) {
2015 if (com->mcr_image & MCR_RTS && com->state & CS_RTS_IFLOW)
2016 outb(com->modem_ctl_port, com->mcr_image &= ~MCR_RTS);
2018 if (!(com->mcr_image & MCR_RTS) && com->iptr < com->ihighwater
2019 && com->state & CS_RTS_IFLOW)
2020 outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS);
2022 mtx_unlock_spin(&sio_lock);
2023 if (tp->t_state & (TS_TIMEOUT | TS_TTSTOP)) {
2028 if (tp->t_outq.c_cc != 0) {
2032 if (!com->obufs[0].l_queued) {
2033 com->obufs[0].l_tail
2034 = com->obuf1 + q_to_b(&tp->t_outq, com->obuf1,
2036 com->obufs[0].l_next = NULL;
2037 com->obufs[0].l_queued = TRUE;
2038 mtx_lock_spin(&sio_lock);
2039 if (com->state & CS_BUSY) {
2040 qp = com->obufq.l_next;
2041 while ((next = qp->l_next) != NULL)
2043 qp->l_next = &com->obufs[0];
2045 com->obufq.l_head = com->obufs[0].l_head;
2046 com->obufq.l_tail = com->obufs[0].l_tail;
2047 com->obufq.l_next = &com->obufs[0];
2048 com->state |= CS_BUSY;
2050 mtx_unlock_spin(&sio_lock);
2052 if (tp->t_outq.c_cc != 0 && !com->obufs[1].l_queued) {
2053 com->obufs[1].l_tail
2054 = com->obuf2 + q_to_b(&tp->t_outq, com->obuf2,
2056 com->obufs[1].l_next = NULL;
2057 com->obufs[1].l_queued = TRUE;
2058 mtx_lock_spin(&sio_lock);
2059 if (com->state & CS_BUSY) {
2060 qp = com->obufq.l_next;
2061 while ((next = qp->l_next) != NULL)
2063 qp->l_next = &com->obufs[1];
2065 com->obufq.l_head = com->obufs[1].l_head;
2066 com->obufq.l_tail = com->obufs[1].l_tail;
2067 com->obufq.l_next = &com->obufs[1];
2068 com->state |= CS_BUSY;
2070 mtx_unlock_spin(&sio_lock);
2072 tp->t_state |= TS_BUSY;
2074 mtx_lock_spin(&sio_lock);
2075 if (com->state >= (CS_BUSY | CS_TTGO))
2076 siointr1(com); /* fake interrupt to start output */
2077 mtx_unlock_spin(&sio_lock);
2090 if (com == NULL || com->gone)
2092 mtx_lock_spin(&sio_lock);
2096 /* XXX avoid h/w bug. */
2099 sio_setreg(com, com_fifo,
2100 FIFO_XMT_RST | com->fifo_image);
2101 com->obufs[0].l_queued = FALSE;
2102 com->obufs[1].l_queued = FALSE;
2103 if (com->state & CS_ODONE)
2104 com_events -= LOTS_OF_EVENTS;
2105 com->state &= ~(CS_ODONE | CS_BUSY);
2106 com->tp->t_state &= ~TS_BUSY;
2111 /* XXX avoid h/w bug. */
2114 sio_setreg(com, com_fifo,
2115 FIFO_RCV_RST | com->fifo_image);
2116 com_events -= (com->iptr - com->ibuf);
2117 com->iptr = com->ibuf;
2119 mtx_unlock_spin(&sio_lock);
2124 commodem(struct tty *tp, int sigon, int sigoff)
2127 int bitand, bitor, msr;
2132 if (sigon != 0 || sigoff != 0) {
2134 if (sigoff & SER_DTR)
2136 if (sigoff & SER_RTS)
2138 if (sigon & SER_DTR)
2140 if (sigon & SER_RTS)
2143 mtx_lock_spin(&sio_lock);
2144 com->mcr_image &= bitand;
2145 com->mcr_image |= bitor;
2146 outb(com->modem_ctl_port, com->mcr_image);
2147 mtx_unlock_spin(&sio_lock);
2151 if (com->mcr_image & MCR_DTR)
2153 if (com->mcr_image & MCR_RTS)
2155 msr = com->prev_modem_status;
2164 if (msr & (MSR_RI | MSR_TERI))
2178 * Set our timeout period to 1 second if no polled devices are open.
2179 * Otherwise set it to max(1/200, 1/hz).
2180 * Enable timeouts iff some device is open.
2182 untimeout(comwakeup, (void *)NULL, sio_timeout_handle);
2185 for (unit = 0; unit < sio_numunits; ++unit) {
2186 com = com_addr(unit);
2187 if (com != NULL && com->tp != NULL
2188 && com->tp->t_state & TS_ISOPEN && !com->gone) {
2190 if (com->poll || com->poll_output) {
2191 sio_timeout = hz > 200 ? hz / 200 : 1;
2197 sio_timeouts_until_log = hz / sio_timeout;
2198 sio_timeout_handle = timeout(comwakeup, (void *)NULL,
2201 /* Flush error messages, if any. */
2202 sio_timeouts_until_log = 1;
2203 comwakeup((void *)NULL);
2204 untimeout(comwakeup, (void *)NULL, sio_timeout_handle);
2215 sio_timeout_handle = timeout(comwakeup, (void *)NULL, sio_timeout);
2218 * Recover from lost output interrupts.
2219 * Poll any lines that don't use interrupts.
2221 for (unit = 0; unit < sio_numunits; ++unit) {
2222 com = com_addr(unit);
2223 if (com != NULL && !com->gone
2224 && (com->state >= (CS_BUSY | CS_TTGO) || com->poll)) {
2225 mtx_lock_spin(&sio_lock);
2227 mtx_unlock_spin(&sio_lock);
2232 * Check for and log errors, but not too often.
2234 if (--sio_timeouts_until_log > 0)
2236 sio_timeouts_until_log = hz / sio_timeout;
2237 for (unit = 0; unit < sio_numunits; ++unit) {
2240 com = com_addr(unit);
2245 for (errnum = 0; errnum < CE_NTYPES; ++errnum) {
2249 mtx_lock_spin(&sio_lock);
2250 delta = com->delta_error_counts[errnum];
2251 com->delta_error_counts[errnum] = 0;
2252 mtx_unlock_spin(&sio_lock);
2255 total = com->error_counts[errnum] += delta;
2256 log(LOG_ERR, "sio%d: %u more %s%s (total %lu)\n",
2257 unit, delta, error_desc[errnum],
2258 delta == 1 ? "" : "s", total);
2264 * Following are all routines needed for SIO to act as console
2275 * This is a function in order to not replicate "ttyd%d" more
2276 * places than absolutely necessary.
2279 siocnset(struct consdev *cd, int unit)
2283 sprintf(cd->cn_name, "ttyd%d", unit);
2286 static speed_t siocngetspeed(Port_t, u_long rclk);
2287 static void siocnclose(struct siocnstate *sp, Port_t iobase);
2288 static void siocnopen(struct siocnstate *sp, Port_t iobase, int speed);
2289 static void siocntxwait(Port_t iobase);
2291 static cn_probe_t sio_cnprobe;
2292 static cn_init_t sio_cninit;
2293 static cn_term_t sio_cnterm;
2294 static cn_getc_t sio_cngetc;
2295 static cn_putc_t sio_cnputc;
2296 static cn_grab_t sio_cngrab;
2297 static cn_ungrab_t sio_cnungrab;
2299 CONSOLE_DRIVER(sio);
2308 * Wait for any pending transmission to finish. Required to avoid
2309 * the UART lockup bug when the speed is changed, and for normal
2313 while ((inb(iobase + com_lsr) & (LSR_TSRE | LSR_TXRDY))
2314 != (LSR_TSRE | LSR_TXRDY) && --timo != 0)
2319 * Read the serial port specified and try to figure out what speed
2320 * it's currently running at. We're assuming the serial port has
2321 * been initialized and is basicly idle. This routine is only intended
2322 * to be run at system startup.
2324 * If the value read from the serial port doesn't make sense, return 0.
2328 siocngetspeed(iobase, rclk)
2337 cfcr = inb(iobase + com_cfcr);
2338 outb(iobase + com_cfcr, CFCR_DLAB | cfcr);
2340 dlbl = inb(iobase + com_dlbl);
2341 dlbh = inb(iobase + com_dlbh);
2343 outb(iobase + com_cfcr, cfcr);
2345 divisor = dlbh << 8 | dlbl;
2347 /* XXX there should be more sanity checking. */
2350 return (rclk / (16UL * divisor));
2354 siocnopen(sp, iobase, speed)
2355 struct siocnstate *sp;
2364 * Save all the device control registers except the fifo register
2365 * and set our default ones (cs8 -parenb speed=comdefaultrate).
2366 * We can't save the fifo register since it is read-only.
2368 sp->ier = inb(iobase + com_ier);
2369 outb(iobase + com_ier, 0); /* spltty() doesn't stop siointr() */
2370 siocntxwait(iobase);
2371 sp->cfcr = inb(iobase + com_cfcr);
2372 outb(iobase + com_cfcr, CFCR_DLAB | CFCR_8BITS);
2373 sp->dlbl = inb(iobase + com_dlbl);
2374 sp->dlbh = inb(iobase + com_dlbh);
2376 * Only set the divisor registers if they would change, since on
2377 * some 16550 incompatibles (Startech), setting them clears the
2378 * data input register. This also reduces the effects of the
2381 divisor = siodivisor(comdefaultrclk, speed);
2382 dlbl = divisor & 0xFF;
2383 if (sp->dlbl != dlbl)
2384 outb(iobase + com_dlbl, dlbl);
2385 dlbh = divisor >> 8;
2386 if (sp->dlbh != dlbh)
2387 outb(iobase + com_dlbh, dlbh);
2388 outb(iobase + com_cfcr, CFCR_8BITS);
2389 sp->mcr = inb(iobase + com_mcr);
2391 * We don't want interrupts, but must be careful not to "disable"
2392 * them by clearing the MCR_IENABLE bit, since that might cause
2393 * an interrupt by floating the IRQ line.
2395 outb(iobase + com_mcr, (sp->mcr & MCR_IENABLE) | MCR_DTR | MCR_RTS);
2399 siocnclose(sp, iobase)
2400 struct siocnstate *sp;
2404 * Restore the device control registers.
2406 siocntxwait(iobase);
2407 outb(iobase + com_cfcr, CFCR_DLAB | CFCR_8BITS);
2408 if (sp->dlbl != inb(iobase + com_dlbl))
2409 outb(iobase + com_dlbl, sp->dlbl);
2410 if (sp->dlbh != inb(iobase + com_dlbh))
2411 outb(iobase + com_dlbh, sp->dlbh);
2412 outb(iobase + com_cfcr, sp->cfcr);
2414 * XXX damp oscillations of MCR_DTR and MCR_RTS by not restoring them.
2416 outb(iobase + com_mcr, sp->mcr | MCR_DTR | MCR_RTS);
2417 outb(iobase + com_ier, sp->ier);
2428 struct siocnstate sp;
2431 * Find our first enabled console, if any. If it is a high-level
2432 * console device, then initialize it and return successfully.
2433 * If it is a low-level console device, then initialize it and
2434 * return unsuccessfully. It must be initialized in both cases
2435 * for early use by console drivers and debuggers. Initializing
2436 * the hardware is not necessary in all cases, since the i/o
2437 * routines initialize it on the fly, but it is necessary if
2438 * input might arrive while the hardware is switched back to an
2439 * uninitialized state. We can't handle multiple console devices
2440 * yet because our low-level routines don't take a device arg.
2441 * We trust the user to set the console flags properly so that we
2442 * don't need to probe.
2444 cp->cn_pri = CN_DEAD;
2446 for (unit = 0; unit < 16; unit++) { /* XXX need to know how many */
2449 if (resource_disabled("sio", unit))
2451 if (resource_int_value("sio", unit, "flags", &flags))
2453 if (COM_CONSOLE(flags) || COM_DEBUGGER(flags)) {
2457 if (resource_int_value("sio", unit, "port", &port))
2461 if ((boothowto & RB_SERIAL) && COM_CONSOLE(flags)) {
2463 siocngetspeed(iobase, comdefaultrclk);
2465 comdefaultrate = boot_speed;
2469 * Initialize the divisor latch. We can't rely on
2470 * siocnopen() to do this the first time, since it
2471 * avoids writing to the latch if the latch appears
2472 * to have the correct value. Also, if we didn't
2473 * just read the speed from the hardware, then we
2474 * need to set the speed in hardware so that
2475 * switching it later is null.
2477 cfcr = inb(iobase + com_cfcr);
2478 outb(iobase + com_cfcr, CFCR_DLAB | cfcr);
2479 divisor = siodivisor(comdefaultrclk, comdefaultrate);
2480 outb(iobase + com_dlbl, divisor & 0xff);
2481 outb(iobase + com_dlbh, divisor >> 8);
2482 outb(iobase + com_cfcr, cfcr);
2484 siocnopen(&sp, iobase, comdefaultrate);
2487 if (COM_CONSOLE(flags) && !COM_LLCONSOLE(flags)) {
2489 cp->cn_pri = COM_FORCECONSOLE(flags)
2490 || boothowto & RB_SERIAL
2491 ? CN_REMOTE : CN_NORMAL;
2492 siocniobase = iobase;
2496 if (COM_DEBUGGER(flags))
2497 siogdbiobase = iobase;
2507 comconsole = cp->cn_unit;
2518 sio_cngrab(struct consdev *cp)
2523 sio_cnungrab(struct consdev *cp)
2528 sio_cngetc(struct consdev *cd)
2533 struct siocnstate sp;
2536 if (cd != NULL && cd->cn_unit == siocnunit) {
2537 iobase = siocniobase;
2538 speed = comdefaultrate;
2541 iobase = siogdbiobase;
2542 speed = gdbdefaultrate;
2548 siocnopen(&sp, iobase, speed);
2549 if (inb(iobase + com_lsr) & LSR_RXRDY)
2550 c = inb(iobase + com_data);
2553 siocnclose(&sp, iobase);
2559 sio_cnputc(struct consdev *cd, int c)
2563 struct siocnstate sp;
2567 if (cd != NULL && cd->cn_unit == siocnunit) {
2568 iobase = siocniobase;
2569 speed = comdefaultrate;
2572 iobase = siogdbiobase;
2573 speed = gdbdefaultrate;
2580 if (!kdb_active && sio_inited == 2 && !mtx_owned(&sio_lock)) {
2581 mtx_lock_spin(&sio_lock);
2584 siocnopen(&sp, iobase, speed);
2585 siocntxwait(iobase);
2586 outb(iobase + com_data, c);
2587 siocnclose(&sp, iobase);
2589 mtx_unlock_spin(&sio_lock);
2594 * Remote gdb(1) support.
2599 #include <gdb/gdb.h>
2601 static gdb_probe_f siogdbprobe;
2602 static gdb_init_f siogdbinit;
2603 static gdb_term_f siogdbterm;
2604 static gdb_getc_f siogdbgetc;
2605 static gdb_putc_f siogdbputc;
2607 GDB_DBGPORT(sio, siogdbprobe, siogdbinit, siogdbterm, siogdbgetc, siogdbputc);
2612 return ((siogdbiobase != 0) ? 0 : -1);
2628 sio_cnputc(NULL, c);
2634 return (sio_cngetc(NULL));