sio.c revision 111194
1/*- 2 * Copyright (c) 1991 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * $FreeBSD: head/sys/dev/sio/sio.c 111194 2003-02-20 20:54:45Z phk $ 34 * from: @(#)com.c 7.5 (Berkeley) 5/16/91 35 * from: i386/isa sio.c,v 1.234 36 */ 37 38#include "opt_comconsole.h" 39#include "opt_compat.h" 40#include "opt_ddb.h" 41#include "opt_sio.h" 42 43/* 44 * Serial driver, based on 386BSD-0.1 com driver. 45 * Mostly rewritten to use pseudo-DMA. 46 * Works for National Semiconductor NS8250-NS16550AF UARTs. 47 * COM driver, based on HP dca driver. 48 * 49 * Changes for PC-Card integration: 50 * - Added PC-Card driver table and handlers 51 */ 52#include <sys/param.h> 53#include <sys/systm.h> 54#include <sys/bus.h> 55#include <sys/conf.h> 56#include <sys/fcntl.h> 57#include <sys/interrupt.h> 58#include <sys/kernel.h> 59#include <sys/lock.h> 60#include <sys/malloc.h> 61#include <sys/module.h> 62#include <sys/mutex.h> 63#include <sys/proc.h> 64#include <sys/reboot.h> 65#include <sys/sysctl.h> 66#include <sys/syslog.h> 67#include <sys/tty.h> 68#include <machine/bus_pio.h> 69#include <machine/bus.h> 70#include <sys/rman.h> 71#include <sys/timepps.h> 72#include <sys/uio.h> 73 74#include <isa/isavar.h> 75 76#include <machine/limits.h> 77#include <machine/resource.h> 78 79#include <dev/sio/sioreg.h> 80#include <dev/sio/siovar.h> 81 82#ifdef COM_ESP 83#include <dev/ic/esp.h> 84#endif 85#include <dev/ic/ns16550.h> 86 87#define LOTS_OF_EVENTS 64 /* helps separate urgent events from input */ 88 89#define CALLOUT_MASK 0x80 90#define CONTROL_MASK 0x60 91#define CONTROL_INIT_STATE 0x20 92#define CONTROL_LOCK_STATE 0x40 93#define DEV_TO_UNIT(dev) (MINOR_TO_UNIT(minor(dev))) 94#define MINOR_TO_UNIT(mynor) ((((mynor) & ~0xffffU) >> (8 + 3)) \ 95 | ((mynor) & 0x1f)) 96#define UNIT_TO_MINOR(unit) ((((unit) & ~0x1fU) << (8 + 3)) \ 97 | ((unit) & 0x1f)) 98 99#ifdef COM_MULTIPORT 100/* checks in flags for multiport and which is multiport "master chip" 101 * for a given card 102 */ 103#define COM_ISMULTIPORT(flags) ((flags) & 0x01) 104#define COM_MPMASTER(flags) (((flags) >> 8) & 0x0ff) 105#define COM_NOTAST4(flags) ((flags) & 0x04) 106#else 107#define COM_ISMULTIPORT(flags) (0) 108#endif /* COM_MULTIPORT */ 109 110#define COM_CONSOLE(flags) ((flags) & 0x10) 111#define COM_FORCECONSOLE(flags) ((flags) & 0x20) 112#define COM_LLCONSOLE(flags) ((flags) & 0x40) 113#define COM_DEBUGGER(flags) ((flags) & 0x80) 114#define COM_LOSESOUTINTS(flags) ((flags) & 0x08) 115#define COM_NOFIFO(flags) ((flags) & 0x02) 116#define COM_ST16650A(flags) ((flags) & 0x20000) 117#define COM_C_NOPROBE (0x40000) 118#define COM_NOPROBE(flags) ((flags) & COM_C_NOPROBE) 119#define COM_C_IIR_TXRDYBUG (0x80000) 120#define COM_IIR_TXRDYBUG(flags) ((flags) & COM_C_IIR_TXRDYBUG) 121#define COM_NOSCR(flags) ((flags) & 0x100000) 122#define COM_FIFOSIZE(flags) (((flags) & 0xff000000) >> 24) 123 124#define sio_getreg(com, off) \ 125 (bus_space_read_1((com)->bst, (com)->bsh, (off))) 126#define sio_setreg(com, off, value) \ 127 (bus_space_write_1((com)->bst, (com)->bsh, (off), (value))) 128 129/* 130 * com state bits. 131 * (CS_BUSY | CS_TTGO) and (CS_BUSY | CS_TTGO | CS_ODEVREADY) must be higher 132 * than the other bits so that they can be tested as a group without masking 133 * off the low bits. 134 * 135 * The following com and tty flags correspond closely: 136 * CS_BUSY = TS_BUSY (maintained by comstart(), siopoll() and 137 * comstop()) 138 * CS_TTGO = ~TS_TTSTOP (maintained by comparam() and comstart()) 139 * CS_CTS_OFLOW = CCTS_OFLOW (maintained by comparam()) 140 * CS_RTS_IFLOW = CRTS_IFLOW (maintained by comparam()) 141 * TS_FLUSH is not used. 142 * XXX I think TIOCSETA doesn't clear TS_TTSTOP when it clears IXON. 143 * XXX CS_*FLOW should be CF_*FLOW in com->flags (control flags not state). 144 */ 145#define CS_BUSY 0x80 /* output in progress */ 146#define CS_TTGO 0x40 /* output not stopped by XOFF */ 147#define CS_ODEVREADY 0x20 /* external device h/w ready (CTS) */ 148#define CS_CHECKMSR 1 /* check of MSR scheduled */ 149#define CS_CTS_OFLOW 2 /* use CTS output flow control */ 150#define CS_DTR_OFF 0x10 /* DTR held off */ 151#define CS_ODONE 4 /* output completed */ 152#define CS_RTS_IFLOW 8 /* use RTS input flow control */ 153#define CSE_BUSYCHECK 1 /* siobusycheck() scheduled */ 154 155static char const * const error_desc[] = { 156#define CE_OVERRUN 0 157 "silo overflow", 158#define CE_INTERRUPT_BUF_OVERFLOW 1 159 "interrupt-level buffer overflow", 160#define CE_TTY_BUF_OVERFLOW 2 161 "tty-level buffer overflow", 162}; 163 164#define CE_NTYPES 3 165#define CE_RECORD(com, errnum) (++(com)->delta_error_counts[errnum]) 166 167/* types. XXX - should be elsewhere */ 168typedef u_int Port_t; /* hardware port */ 169typedef u_char bool_t; /* boolean */ 170 171/* queue of linear buffers */ 172struct lbq { 173 u_char *l_head; /* next char to process */ 174 u_char *l_tail; /* one past the last char to process */ 175 struct lbq *l_next; /* next in queue */ 176 bool_t l_queued; /* nonzero if queued */ 177}; 178 179/* com device structure */ 180struct com_s { 181 u_int flags; /* Copy isa device flags */ 182 u_char state; /* miscellaneous flag bits */ 183 bool_t active_out; /* nonzero if the callout device is open */ 184 u_char cfcr_image; /* copy of value written to CFCR */ 185#ifdef COM_ESP 186 bool_t esp; /* is this unit a hayes esp board? */ 187#endif 188 u_char extra_state; /* more flag bits, separate for order trick */ 189 u_char fifo_image; /* copy of value written to FIFO */ 190 bool_t hasfifo; /* nonzero for 16550 UARTs */ 191 bool_t st16650a; /* Is a Startech 16650A or RTS/CTS compat */ 192 bool_t loses_outints; /* nonzero if device loses output interrupts */ 193 u_char mcr_image; /* copy of value written to MCR */ 194#ifdef COM_MULTIPORT 195 bool_t multiport; /* is this unit part of a multiport device? */ 196#endif /* COM_MULTIPORT */ 197 bool_t no_irq; /* nonzero if irq is not attached */ 198 bool_t gone; /* hardware disappeared */ 199 bool_t poll; /* nonzero if polling is required */ 200 bool_t poll_output; /* nonzero if polling for output is required */ 201 int unit; /* unit number */ 202 int dtr_wait; /* time to hold DTR down on close (* 1/hz) */ 203 u_int tx_fifo_size; 204 u_int wopeners; /* # processes waiting for DCD in open() */ 205 206 /* 207 * The high level of the driver never reads status registers directly 208 * because there would be too many side effects to handle conveniently. 209 * Instead, it reads copies of the registers stored here by the 210 * interrupt handler. 211 */ 212 u_char last_modem_status; /* last MSR read by intr handler */ 213 u_char prev_modem_status; /* last MSR handled by high level */ 214 215 u_char hotchar; /* ldisc-specific char to be handled ASAP */ 216 u_char *ibuf; /* start of input buffer */ 217 u_char *ibufend; /* end of input buffer */ 218 u_char *ibufold; /* old input buffer, to be freed */ 219 u_char *ihighwater; /* threshold in input buffer */ 220 u_char *iptr; /* next free spot in input buffer */ 221 int ibufsize; /* size of ibuf (not include error bytes) */ 222 int ierroff; /* offset of error bytes in ibuf */ 223 224 struct lbq obufq; /* head of queue of output buffers */ 225 struct lbq obufs[2]; /* output buffers */ 226 227 bus_space_tag_t bst; 228 bus_space_handle_t bsh; 229 230 Port_t data_port; /* i/o ports */ 231#ifdef COM_ESP 232 Port_t esp_port; 233#endif 234 Port_t int_id_port; 235 Port_t modem_ctl_port; 236 Port_t line_status_port; 237 Port_t modem_status_port; 238 Port_t intr_ctl_port; /* Ports of IIR register */ 239 240 struct tty *tp; /* cross reference */ 241 242 /* Initial state. */ 243 struct termios it_in; /* should be in struct tty */ 244 struct termios it_out; 245 246 /* Lock state. */ 247 struct termios lt_in; /* should be in struct tty */ 248 struct termios lt_out; 249 250 bool_t do_timestamp; 251 bool_t do_dcd_timestamp; 252 struct timeval timestamp; 253 struct timeval dcd_timestamp; 254 struct pps_state pps; 255 256 u_long bytes_in; /* statistics */ 257 u_long bytes_out; 258 u_int delta_error_counts[CE_NTYPES]; 259 u_long error_counts[CE_NTYPES]; 260 261 u_long rclk; 262 263 struct resource *irqres; 264 struct resource *ioportres; 265 void *cookie; 266 dev_t devs[6]; 267 268 /* 269 * Data area for output buffers. Someday we should build the output 270 * buffer queue without copying data. 271 */ 272 u_char obuf1[256]; 273 u_char obuf2[256]; 274}; 275 276#ifdef COM_ESP 277static int espattach(struct com_s *com, Port_t esp_port); 278#endif 279 280static timeout_t siobusycheck; 281static u_int siodivisor(u_long rclk, speed_t speed); 282static timeout_t siodtrwakeup; 283static void comhardclose(struct com_s *com); 284static void sioinput(struct com_s *com); 285static void siointr1(struct com_s *com); 286static void siointr(void *arg); 287static int commctl(struct com_s *com, int bits, int how); 288static int comparam(struct tty *tp, struct termios *t); 289static void siopoll(void *); 290static void siosettimeout(void); 291static int siosetwater(struct com_s *com, speed_t speed); 292static void comstart(struct tty *tp); 293static void comstop(struct tty *tp, int rw); 294static timeout_t comwakeup; 295static void disc_optim(struct tty *tp, struct termios *t, 296 struct com_s *com); 297 298char sio_driver_name[] = "sio"; 299static struct mtx sio_lock; 300static int sio_inited; 301 302/* table and macro for fast conversion from a unit number to its com struct */ 303devclass_t sio_devclass; 304#define com_addr(unit) ((struct com_s *) \ 305 devclass_get_softc(sio_devclass, unit)) /* XXX */ 306 307static d_open_t sioopen; 308static d_close_t sioclose; 309static d_read_t sioread; 310static d_write_t siowrite; 311static d_ioctl_t sioioctl; 312 313#define CDEV_MAJOR 28 314static struct cdevsw sio_cdevsw = { 315 /* open */ sioopen, 316 /* close */ sioclose, 317 /* read */ sioread, 318 /* write */ siowrite, 319 /* ioctl */ sioioctl, 320 /* poll */ ttypoll, 321 /* mmap */ nommap, 322 /* strategy */ nostrategy, 323 /* name */ sio_driver_name, 324 /* maj */ CDEV_MAJOR, 325 /* dump */ nodump, 326 /* psize */ nopsize, 327 /* flags */ D_TTY | D_KQFILTER, 328 /* kqfilter */ ttykqfilter, 329}; 330 331int comconsole = -1; 332static volatile speed_t comdefaultrate = CONSPEED; 333static u_long comdefaultrclk = DEFAULT_RCLK; 334SYSCTL_ULONG(_machdep, OID_AUTO, conrclk, CTLFLAG_RW, &comdefaultrclk, 0, ""); 335static speed_t gdbdefaultrate = GDBSPEED; 336SYSCTL_UINT(_machdep, OID_AUTO, gdbspeed, CTLFLAG_RW, 337 &gdbdefaultrate, GDBSPEED, ""); 338static u_int com_events; /* input chars + weighted output completions */ 339static Port_t siocniobase; 340static int siocnunit = -1; 341static Port_t siogdbiobase; 342static int siogdbunit = -1; 343static void *sio_slow_ih; 344static void *sio_fast_ih; 345static int sio_timeout; 346static int sio_timeouts_until_log; 347static struct callout_handle sio_timeout_handle 348 = CALLOUT_HANDLE_INITIALIZER(&sio_timeout_handle); 349static int sio_numunits; 350 351#ifdef COM_ESP 352/* XXX configure this properly. */ 353/* XXX quite broken for new-bus. */ 354static Port_t likely_com_ports[] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8, }; 355static Port_t likely_esp_ports[] = { 0x140, 0x180, 0x280, 0 }; 356#endif 357 358/* 359 * handle sysctl read/write requests for console speed 360 * 361 * In addition to setting comdefaultrate for I/O through /dev/console, 362 * also set the initial and lock values for the /dev/ttyXX device 363 * if there is one associated with the console. Finally, if the /dev/tty 364 * device has already been open, change the speed on the open running port 365 * itself. 366 */ 367 368static int 369sysctl_machdep_comdefaultrate(SYSCTL_HANDLER_ARGS) 370{ 371 int error, s; 372 speed_t newspeed; 373 struct com_s *com; 374 struct tty *tp; 375 376 newspeed = comdefaultrate; 377 378 error = sysctl_handle_opaque(oidp, &newspeed, sizeof newspeed, req); 379 if (error || !req->newptr) 380 return (error); 381 382 comdefaultrate = newspeed; 383 384 if (comconsole < 0) /* serial console not selected? */ 385 return (0); 386 387 com = com_addr(comconsole); 388 if (com == NULL) 389 return (ENXIO); 390 391 /* 392 * set the initial and lock rates for /dev/ttydXX and /dev/cuaXX 393 * (note, the lock rates really are boolean -- if non-zero, disallow 394 * speed changes) 395 */ 396 com->it_in.c_ispeed = com->it_in.c_ospeed = 397 com->lt_in.c_ispeed = com->lt_in.c_ospeed = 398 com->it_out.c_ispeed = com->it_out.c_ospeed = 399 com->lt_out.c_ispeed = com->lt_out.c_ospeed = comdefaultrate; 400 401 /* 402 * if we're open, change the running rate too 403 */ 404 tp = com->tp; 405 if (tp && (tp->t_state & TS_ISOPEN)) { 406 tp->t_termios.c_ispeed = 407 tp->t_termios.c_ospeed = comdefaultrate; 408 s = spltty(); 409 error = comparam(tp, &tp->t_termios); 410 splx(s); 411 } 412 return error; 413} 414 415SYSCTL_PROC(_machdep, OID_AUTO, conspeed, CTLTYPE_INT | CTLFLAG_RW, 416 0, 0, sysctl_machdep_comdefaultrate, "I", ""); 417/* TUNABLE_INT("machdep.conspeed", &comdefaultrate); */ 418 419#define SET_FLAG(dev, bit) device_set_flags(dev, device_get_flags(dev) | (bit)) 420#define CLR_FLAG(dev, bit) device_set_flags(dev, device_get_flags(dev) & ~(bit)) 421 422/* 423 * Unload the driver and clear the table. 424 * XXX this is mostly wrong. 425 * XXX TODO: 426 * This is usually called when the card is ejected, but 427 * can be caused by a kldunload of a controller driver. 428 * The idea is to reset the driver's view of the device 429 * and ensure that any driver entry points such as 430 * read and write do not hang. 431 */ 432int 433siodetach(dev) 434 device_t dev; 435{ 436 struct com_s *com; 437 int i; 438 439 com = (struct com_s *) device_get_softc(dev); 440 if (com == NULL) { 441 device_printf(dev, "NULL com in siounload\n"); 442 return (0); 443 } 444 com->gone = 1; 445 for (i = 0 ; i < 6; i++) 446 destroy_dev(com->devs[i]); 447 if (com->irqres) { 448 bus_teardown_intr(dev, com->irqres, com->cookie); 449 bus_release_resource(dev, SYS_RES_IRQ, 0, com->irqres); 450 } 451 if (com->ioportres) 452 bus_release_resource(dev, SYS_RES_IOPORT, 0, com->ioportres); 453 if (com->tp && (com->tp->t_state & TS_ISOPEN)) { 454 device_printf(dev, "still open, forcing close\n"); 455 (*linesw[com->tp->t_line].l_close)(com->tp, 0); 456 com->tp->t_gen++; 457 ttyclose(com->tp); 458 ttwakeup(com->tp); 459 ttwwakeup(com->tp); 460 } else { 461 if (com->ibuf != NULL) 462 free(com->ibuf, M_DEVBUF); 463 device_set_softc(dev, NULL); 464 free(com, M_DEVBUF); 465 } 466 return (0); 467} 468 469int 470sioprobe(dev, xrid, rclk, noprobe) 471 device_t dev; 472 int xrid; 473 u_long rclk; 474 int noprobe; 475{ 476#if 0 477 static bool_t already_init; 478 device_t xdev; 479#endif 480 struct com_s *com; 481 u_int divisor; 482 bool_t failures[10]; 483 int fn; 484 device_t idev; 485 Port_t iobase; 486 intrmask_t irqmap[4]; 487 intrmask_t irqs; 488 u_char mcr_image; 489 int result; 490 u_long xirq; 491 u_int flags = device_get_flags(dev); 492 int rid; 493 struct resource *port; 494 495 rid = xrid; 496 port = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid, 497 0, ~0, IO_COMSIZE, RF_ACTIVE); 498 if (!port) 499 return (ENXIO); 500 501 com = malloc(sizeof(*com), M_DEVBUF, M_NOWAIT | M_ZERO); 502 if (com == NULL) 503 return (ENOMEM); 504 device_set_softc(dev, com); 505 com->bst = rman_get_bustag(port); 506 com->bsh = rman_get_bushandle(port); 507 if (rclk == 0) 508 rclk = DEFAULT_RCLK; 509 com->rclk = rclk; 510 511 while (sio_inited != 2) 512 if (atomic_cmpset_int(&sio_inited, 0, 1)) { 513 mtx_init(&sio_lock, sio_driver_name, NULL, 514 (comconsole != -1) ? 515 MTX_SPIN | MTX_QUIET : MTX_SPIN); 516 atomic_store_rel_int(&sio_inited, 2); 517 } 518 519#if 0 520 /* 521 * XXX this is broken - when we are first called, there are no 522 * previously configured IO ports. We could hard code 523 * 0x3f8, 0x2f8, 0x3e8, 0x2e8 etc but that's probably worse. 524 * This code has been doing nothing since the conversion since 525 * "count" is zero the first time around. 526 */ 527 if (!already_init) { 528 /* 529 * Turn off MCR_IENABLE for all likely serial ports. An unused 530 * port with its MCR_IENABLE gate open will inhibit interrupts 531 * from any used port that shares the interrupt vector. 532 * XXX the gate enable is elsewhere for some multiports. 533 */ 534 device_t *devs; 535 int count, i, xioport; 536 537 devclass_get_devices(sio_devclass, &devs, &count); 538 for (i = 0; i < count; i++) { 539 xdev = devs[i]; 540 if (device_is_enabled(xdev) && 541 bus_get_resource(xdev, SYS_RES_IOPORT, 0, &xioport, 542 NULL) == 0) 543 outb(xioport + com_mcr, 0); 544 } 545 free(devs, M_TEMP); 546 already_init = TRUE; 547 } 548#endif 549 550 if (COM_LLCONSOLE(flags)) { 551 printf("sio%d: reserved for low-level i/o\n", 552 device_get_unit(dev)); 553 bus_release_resource(dev, SYS_RES_IOPORT, rid, port); 554 device_set_softc(dev, NULL); 555 free(com, M_DEVBUF); 556 return (ENXIO); 557 } 558 559 /* 560 * If the device is on a multiport card and has an AST/4 561 * compatible interrupt control register, initialize this 562 * register and prepare to leave MCR_IENABLE clear in the mcr. 563 * Otherwise, prepare to set MCR_IENABLE in the mcr. 564 * Point idev to the device struct giving the correct id_irq. 565 * This is the struct for the master device if there is one. 566 */ 567 idev = dev; 568 mcr_image = MCR_IENABLE; 569#ifdef COM_MULTIPORT 570 if (COM_ISMULTIPORT(flags)) { 571 Port_t xiobase; 572 u_long io; 573 574 idev = devclass_get_device(sio_devclass, COM_MPMASTER(flags)); 575 if (idev == NULL) { 576 printf("sio%d: master device %d not configured\n", 577 device_get_unit(dev), COM_MPMASTER(flags)); 578 idev = dev; 579 } 580 if (!COM_NOTAST4(flags)) { 581 if (bus_get_resource(idev, SYS_RES_IOPORT, 0, &io, 582 NULL) == 0) { 583 xiobase = io; 584 if (bus_get_resource(idev, SYS_RES_IRQ, 0, 585 NULL, NULL) == 0) 586 outb(xiobase + com_scr, 0x80); 587 else 588 outb(xiobase + com_scr, 0); 589 } 590 mcr_image = 0; 591 } 592 } 593#endif /* COM_MULTIPORT */ 594 if (bus_get_resource(idev, SYS_RES_IRQ, 0, NULL, NULL) != 0) 595 mcr_image = 0; 596 597 bzero(failures, sizeof failures); 598 iobase = rman_get_start(port); 599 600 /* 601 * We don't want to get actual interrupts, just masked ones. 602 * Interrupts from this line should already be masked in the ICU, 603 * but mask them in the processor as well in case there are some 604 * (misconfigured) shared interrupts. 605 */ 606 mtx_lock_spin(&sio_lock); 607/* EXTRA DELAY? */ 608 609 /* 610 * Initialize the speed and the word size and wait long enough to 611 * drain the maximum of 16 bytes of junk in device output queues. 612 * The speed is undefined after a master reset and must be set 613 * before relying on anything related to output. There may be 614 * junk after a (very fast) soft reboot and (apparently) after 615 * master reset. 616 * XXX what about the UART bug avoided by waiting in comparam()? 617 * We don't want to to wait long enough to drain at 2 bps. 618 */ 619 if (iobase == siocniobase) 620 DELAY((16 + 1) * 1000000 / (comdefaultrate / 10)); 621 else { 622 sio_setreg(com, com_cfcr, CFCR_DLAB | CFCR_8BITS); 623 divisor = siodivisor(rclk, SIO_TEST_SPEED); 624 sio_setreg(com, com_dlbl, divisor & 0xff); 625 sio_setreg(com, com_dlbh, divisor >> 8); 626 sio_setreg(com, com_cfcr, CFCR_8BITS); 627 DELAY((16 + 1) * 1000000 / (SIO_TEST_SPEED / 10)); 628 } 629 630 /* 631 * Enable the interrupt gate and disable device interupts. This 632 * should leave the device driving the interrupt line low and 633 * guarantee an edge trigger if an interrupt can be generated. 634 */ 635/* EXTRA DELAY? */ 636 sio_setreg(com, com_mcr, mcr_image); 637 sio_setreg(com, com_ier, 0); 638 DELAY(1000); /* XXX */ 639 irqmap[0] = isa_irq_pending(); 640 641 /* 642 * Attempt to set loopback mode so that we can send a null byte 643 * without annoying any external device. 644 */ 645/* EXTRA DELAY? */ 646 sio_setreg(com, com_mcr, mcr_image | MCR_LOOPBACK); 647 648 /* 649 * Attempt to generate an output interrupt. On 8250's, setting 650 * IER_ETXRDY generates an interrupt independent of the current 651 * setting and independent of whether the THR is empty. On 16450's, 652 * setting IER_ETXRDY generates an interrupt independent of the 653 * current setting. On 16550A's, setting IER_ETXRDY only 654 * generates an interrupt when IER_ETXRDY is not already set. 655 */ 656 sio_setreg(com, com_ier, IER_ETXRDY); 657 658 /* 659 * On some 16x50 incompatibles, setting IER_ETXRDY doesn't generate 660 * an interrupt. They'd better generate one for actually doing 661 * output. Loopback may be broken on the same incompatibles but 662 * it's unlikely to do more than allow the null byte out. 663 */ 664 sio_setreg(com, com_data, 0); 665 DELAY((1 + 2) * 1000000 / (SIO_TEST_SPEED / 10)); 666 667 /* 668 * Turn off loopback mode so that the interrupt gate works again 669 * (MCR_IENABLE was hidden). This should leave the device driving 670 * an interrupt line high. It doesn't matter if the interrupt 671 * line oscillates while we are not looking at it, since interrupts 672 * are disabled. 673 */ 674/* EXTRA DELAY? */ 675 sio_setreg(com, com_mcr, mcr_image); 676 677 /* 678 * It seems my Xircom CBEM56G Cardbus modem wants to be reset 679 * to 8 bits *again*, or else probe test 0 will fail. 680 * gwk@sgi.com, 4/19/2001 681 */ 682 sio_setreg(com, com_cfcr, CFCR_8BITS); 683 684 /* 685 * Some pcmcia cards have the "TXRDY bug", so we check everyone 686 * for IIR_TXRDY implementation ( Palido 321s, DC-1S... ) 687 */ 688 if (noprobe) { 689 /* Reading IIR register twice */ 690 for (fn = 0; fn < 2; fn ++) { 691 DELAY(10000); 692 failures[6] = sio_getreg(com, com_iir); 693 } 694 /* Check IIR_TXRDY clear ? */ 695 result = 0; 696 if (failures[6] & IIR_TXRDY) { 697 /* No, Double check with clearing IER */ 698 sio_setreg(com, com_ier, 0); 699 if (sio_getreg(com, com_iir) & IIR_NOPEND) { 700 /* Ok. We discovered TXRDY bug! */ 701 SET_FLAG(dev, COM_C_IIR_TXRDYBUG); 702 } else { 703 /* Unknown, Just omit this chip.. XXX */ 704 result = ENXIO; 705 sio_setreg(com, com_mcr, 0); 706 } 707 } else { 708 /* OK. this is well-known guys */ 709 CLR_FLAG(dev, COM_C_IIR_TXRDYBUG); 710 } 711 sio_setreg(com, com_ier, 0); 712 sio_setreg(com, com_cfcr, CFCR_8BITS); 713 mtx_unlock_spin(&sio_lock); 714 bus_release_resource(dev, SYS_RES_IOPORT, rid, port); 715 if (iobase == siocniobase) 716 result = 0; 717 if (result != 0) { 718 device_set_softc(dev, NULL); 719 free(com, M_DEVBUF); 720 } 721 return (result); 722 } 723 724 /* 725 * Check that 726 * o the CFCR, IER and MCR in UART hold the values written to them 727 * (the values happen to be all distinct - this is good for 728 * avoiding false positive tests from bus echoes). 729 * o an output interrupt is generated and its vector is correct. 730 * o the interrupt goes away when the IIR in the UART is read. 731 */ 732/* EXTRA DELAY? */ 733 failures[0] = sio_getreg(com, com_cfcr) - CFCR_8BITS; 734 failures[1] = sio_getreg(com, com_ier) - IER_ETXRDY; 735 failures[2] = sio_getreg(com, com_mcr) - mcr_image; 736 DELAY(10000); /* Some internal modems need this time */ 737 irqmap[1] = isa_irq_pending(); 738 failures[4] = (sio_getreg(com, com_iir) & IIR_IMASK) - IIR_TXRDY; 739 DELAY(1000); /* XXX */ 740 irqmap[2] = isa_irq_pending(); 741 failures[6] = (sio_getreg(com, com_iir) & IIR_IMASK) - IIR_NOPEND; 742 743 /* 744 * Turn off all device interrupts and check that they go off properly. 745 * Leave MCR_IENABLE alone. For ports without a master port, it gates 746 * the OUT2 output of the UART to 747 * the ICU input. Closing the gate would give a floating ICU input 748 * (unless there is another device driving it) and spurious interrupts. 749 * (On the system that this was first tested on, the input floats high 750 * and gives a (masked) interrupt as soon as the gate is closed.) 751 */ 752 sio_setreg(com, com_ier, 0); 753 sio_setreg(com, com_cfcr, CFCR_8BITS); /* dummy to avoid bus echo */ 754 failures[7] = sio_getreg(com, com_ier); 755 DELAY(1000); /* XXX */ 756 irqmap[3] = isa_irq_pending(); 757 failures[9] = (sio_getreg(com, com_iir) & IIR_IMASK) - IIR_NOPEND; 758 759 mtx_unlock_spin(&sio_lock); 760 761 irqs = irqmap[1] & ~irqmap[0]; 762 if (bus_get_resource(idev, SYS_RES_IRQ, 0, &xirq, NULL) == 0 && 763 ((1 << xirq) & irqs) == 0) { 764 printf( 765 "sio%d: configured irq %ld not in bitmap of probed irqs %#x\n", 766 device_get_unit(dev), xirq, irqs); 767 printf( 768 "sio%d: port may not be enabled\n", 769 device_get_unit(dev)); 770 } 771 if (bootverbose) 772 printf("sio%d: irq maps: %#x %#x %#x %#x\n", 773 device_get_unit(dev), 774 irqmap[0], irqmap[1], irqmap[2], irqmap[3]); 775 776 result = 0; 777 for (fn = 0; fn < sizeof failures; ++fn) 778 if (failures[fn]) { 779 sio_setreg(com, com_mcr, 0); 780 result = ENXIO; 781 if (bootverbose) { 782 printf("sio%d: probe failed test(s):", 783 device_get_unit(dev)); 784 for (fn = 0; fn < sizeof failures; ++fn) 785 if (failures[fn]) 786 printf(" %d", fn); 787 printf("\n"); 788 } 789 break; 790 } 791 bus_release_resource(dev, SYS_RES_IOPORT, rid, port); 792 if (iobase == siocniobase) 793 result = 0; 794 if (result != 0) { 795 device_set_softc(dev, NULL); 796 free(com, M_DEVBUF); 797 } 798 return (result); 799} 800 801#ifdef COM_ESP 802static int 803espattach(com, esp_port) 804 struct com_s *com; 805 Port_t esp_port; 806{ 807 u_char dips; 808 u_char val; 809 810 /* 811 * Check the ESP-specific I/O port to see if we're an ESP 812 * card. If not, return failure immediately. 813 */ 814 if ((inb(esp_port) & 0xf3) == 0) { 815 printf(" port 0x%x is not an ESP board?\n", esp_port); 816 return (0); 817 } 818 819 /* 820 * We've got something that claims to be a Hayes ESP card. 821 * Let's hope so. 822 */ 823 824 /* Get the dip-switch configuration */ 825 outb(esp_port + ESP_CMD1, ESP_GETDIPS); 826 dips = inb(esp_port + ESP_STATUS1); 827 828 /* 829 * Bits 0,1 of dips say which COM port we are. 830 */ 831 if (rman_get_start(com->ioportres) == likely_com_ports[dips & 0x03]) 832 printf(" : ESP"); 833 else { 834 printf(" esp_port has com %d\n", dips & 0x03); 835 return (0); 836 } 837 838 /* 839 * Check for ESP version 2.0 or later: bits 4,5,6 = 010. 840 */ 841 outb(esp_port + ESP_CMD1, ESP_GETTEST); 842 val = inb(esp_port + ESP_STATUS1); /* clear reg 1 */ 843 val = inb(esp_port + ESP_STATUS2); 844 if ((val & 0x70) < 0x20) { 845 printf("-old (%o)", val & 0x70); 846 return (0); 847 } 848 849 /* 850 * Check for ability to emulate 16550: bit 7 == 1 851 */ 852 if ((dips & 0x80) == 0) { 853 printf(" slave"); 854 return (0); 855 } 856 857 /* 858 * Okay, we seem to be a Hayes ESP card. Whee. 859 */ 860 com->esp = TRUE; 861 com->esp_port = esp_port; 862 return (1); 863} 864#endif /* COM_ESP */ 865 866int 867sioattach(dev, xrid, rclk) 868 device_t dev; 869 int xrid; 870 u_long rclk; 871{ 872 struct com_s *com; 873#ifdef COM_ESP 874 Port_t *espp; 875#endif 876 Port_t iobase; 877 int minorbase; 878 int unit; 879 u_int flags; 880 int rid; 881 struct resource *port; 882 int ret; 883 884 rid = xrid; 885 port = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid, 886 0, ~0, IO_COMSIZE, RF_ACTIVE); 887 if (!port) 888 return (ENXIO); 889 890 iobase = rman_get_start(port); 891 unit = device_get_unit(dev); 892 com = device_get_softc(dev); 893 flags = device_get_flags(dev); 894 895 if (unit >= sio_numunits) 896 sio_numunits = unit + 1; 897 /* 898 * sioprobe() has initialized the device registers as follows: 899 * o cfcr = CFCR_8BITS. 900 * It is most important that CFCR_DLAB is off, so that the 901 * data port is not hidden when we enable interrupts. 902 * o ier = 0. 903 * Interrupts are only enabled when the line is open. 904 * o mcr = MCR_IENABLE, or 0 if the port has AST/4 compatible 905 * interrupt control register or the config specifies no irq. 906 * Keeping MCR_DTR and MCR_RTS off might stop the external 907 * device from sending before we are ready. 908 */ 909 bzero(com, sizeof *com); 910 com->unit = unit; 911 com->ioportres = port; 912 com->bst = rman_get_bustag(port); 913 com->bsh = rman_get_bushandle(port); 914 com->cfcr_image = CFCR_8BITS; 915 com->dtr_wait = 3 * hz; 916 com->loses_outints = COM_LOSESOUTINTS(flags) != 0; 917 com->no_irq = bus_get_resource(dev, SYS_RES_IRQ, 0, NULL, NULL) != 0; 918 com->tx_fifo_size = 1; 919 com->obufs[0].l_head = com->obuf1; 920 com->obufs[1].l_head = com->obuf2; 921 922 com->data_port = iobase + com_data; 923 com->int_id_port = iobase + com_iir; 924 com->modem_ctl_port = iobase + com_mcr; 925 com->mcr_image = inb(com->modem_ctl_port); 926 com->line_status_port = iobase + com_lsr; 927 com->modem_status_port = iobase + com_msr; 928 com->intr_ctl_port = iobase + com_ier; 929 930 if (rclk == 0) 931 rclk = DEFAULT_RCLK; 932 com->rclk = rclk; 933 934 /* 935 * We don't use all the flags from <sys/ttydefaults.h> since they 936 * are only relevant for logins. It's important to have echo off 937 * initially so that the line doesn't start blathering before the 938 * echo flag can be turned off. 939 */ 940 com->it_in.c_iflag = 0; 941 com->it_in.c_oflag = 0; 942 com->it_in.c_cflag = TTYDEF_CFLAG; 943 com->it_in.c_lflag = 0; 944 if (unit == comconsole) { 945 com->it_in.c_iflag = TTYDEF_IFLAG; 946 com->it_in.c_oflag = TTYDEF_OFLAG; 947 com->it_in.c_cflag = TTYDEF_CFLAG | CLOCAL; 948 com->it_in.c_lflag = TTYDEF_LFLAG; 949 com->lt_out.c_cflag = com->lt_in.c_cflag = CLOCAL; 950 com->lt_out.c_ispeed = com->lt_out.c_ospeed = 951 com->lt_in.c_ispeed = com->lt_in.c_ospeed = 952 com->it_in.c_ispeed = com->it_in.c_ospeed = comdefaultrate; 953 } else 954 com->it_in.c_ispeed = com->it_in.c_ospeed = TTYDEF_SPEED; 955 if (siosetwater(com, com->it_in.c_ispeed) != 0) { 956 mtx_unlock_spin(&sio_lock); 957 /* 958 * Leave i/o resources allocated if this is a `cn'-level 959 * console, so that other devices can't snarf them. 960 */ 961 if (iobase != siocniobase) 962 bus_release_resource(dev, SYS_RES_IOPORT, rid, port); 963 return (ENOMEM); 964 } 965 mtx_unlock_spin(&sio_lock); 966 termioschars(&com->it_in); 967 com->it_out = com->it_in; 968 969 /* attempt to determine UART type */ 970 printf("sio%d: type", unit); 971 972 973 if (!COM_ISMULTIPORT(flags) && 974 !COM_IIR_TXRDYBUG(flags) && !COM_NOSCR(flags)) { 975 u_char scr; 976 u_char scr1; 977 u_char scr2; 978 979 scr = sio_getreg(com, com_scr); 980 sio_setreg(com, com_scr, 0xa5); 981 scr1 = sio_getreg(com, com_scr); 982 sio_setreg(com, com_scr, 0x5a); 983 scr2 = sio_getreg(com, com_scr); 984 sio_setreg(com, com_scr, scr); 985 if (scr1 != 0xa5 || scr2 != 0x5a) { 986 printf(" 8250 or not responding"); 987 goto determined_type; 988 } 989 } 990 sio_setreg(com, com_fifo, FIFO_ENABLE | FIFO_RX_HIGH); 991 DELAY(100); 992 com->st16650a = 0; 993 switch (inb(com->int_id_port) & IIR_FIFO_MASK) { 994 case FIFO_RX_LOW: 995 printf(" 16450"); 996 break; 997 case FIFO_RX_MEDL: 998 printf(" 16450?"); 999 break; 1000 case FIFO_RX_MEDH: 1001 printf(" 16550?"); 1002 break; 1003 case FIFO_RX_HIGH: 1004 if (COM_NOFIFO(flags)) { 1005 printf(" 16550A fifo disabled"); 1006 } else { 1007 com->hasfifo = TRUE; 1008 if (COM_ST16650A(flags)) { 1009 com->st16650a = 1; 1010 com->tx_fifo_size = 32; 1011 printf(" ST16650A"); 1012 } else { 1013 com->tx_fifo_size = COM_FIFOSIZE(flags); 1014 printf(" 16550A"); 1015 } 1016 } 1017#ifdef COM_ESP 1018 for (espp = likely_esp_ports; *espp != 0; espp++) 1019 if (espattach(com, *espp)) { 1020 com->tx_fifo_size = 1024; 1021 break; 1022 } 1023#endif 1024 if (!com->st16650a) { 1025 if (!com->tx_fifo_size) 1026 com->tx_fifo_size = 16; 1027 else 1028 printf(" lookalike with %d bytes FIFO", 1029 com->tx_fifo_size); 1030 } 1031 1032 break; 1033 } 1034 1035#ifdef COM_ESP 1036 if (com->esp) { 1037 /* 1038 * Set 16550 compatibility mode. 1039 * We don't use the ESP_MODE_SCALE bit to increase the 1040 * fifo trigger levels because we can't handle large 1041 * bursts of input. 1042 * XXX flow control should be set in comparam(), not here. 1043 */ 1044 outb(com->esp_port + ESP_CMD1, ESP_SETMODE); 1045 outb(com->esp_port + ESP_CMD2, ESP_MODE_RTS | ESP_MODE_FIFO); 1046 1047 /* Set RTS/CTS flow control. */ 1048 outb(com->esp_port + ESP_CMD1, ESP_SETFLOWTYPE); 1049 outb(com->esp_port + ESP_CMD2, ESP_FLOW_RTS); 1050 outb(com->esp_port + ESP_CMD2, ESP_FLOW_CTS); 1051 1052 /* Set flow-control levels. */ 1053 outb(com->esp_port + ESP_CMD1, ESP_SETRXFLOW); 1054 outb(com->esp_port + ESP_CMD2, HIBYTE(768)); 1055 outb(com->esp_port + ESP_CMD2, LOBYTE(768)); 1056 outb(com->esp_port + ESP_CMD2, HIBYTE(512)); 1057 outb(com->esp_port + ESP_CMD2, LOBYTE(512)); 1058 } 1059#endif /* COM_ESP */ 1060 sio_setreg(com, com_fifo, 0); 1061determined_type: ; 1062 1063#ifdef COM_MULTIPORT 1064 if (COM_ISMULTIPORT(flags)) { 1065 device_t masterdev; 1066 1067 com->multiport = TRUE; 1068 printf(" (multiport"); 1069 if (unit == COM_MPMASTER(flags)) 1070 printf(" master"); 1071 printf(")"); 1072 masterdev = devclass_get_device(sio_devclass, 1073 COM_MPMASTER(flags)); 1074 com->no_irq = (masterdev == NULL || bus_get_resource(masterdev, 1075 SYS_RES_IRQ, 0, NULL, NULL) != 0); 1076 } 1077#endif /* COM_MULTIPORT */ 1078 if (unit == comconsole) 1079 printf(", console"); 1080 if (COM_IIR_TXRDYBUG(flags)) 1081 printf(" with a bogus IIR_TXRDY register"); 1082 printf("\n"); 1083 1084 if (sio_fast_ih == NULL) { 1085 swi_add(&tty_ithd, "tty:sio", siopoll, NULL, SWI_TTY, 0, 1086 &sio_fast_ih); 1087 swi_add(&clk_ithd, "tty:sio", siopoll, NULL, SWI_TTY, 0, 1088 &sio_slow_ih); 1089 } 1090 minorbase = UNIT_TO_MINOR(unit); 1091 com->devs[0] = make_dev(&sio_cdevsw, minorbase, 1092 UID_ROOT, GID_WHEEL, 0600, "ttyd%r", unit); 1093 com->devs[1] = make_dev(&sio_cdevsw, minorbase | CONTROL_INIT_STATE, 1094 UID_ROOT, GID_WHEEL, 0600, "ttyid%r", unit); 1095 com->devs[2] = make_dev(&sio_cdevsw, minorbase | CONTROL_LOCK_STATE, 1096 UID_ROOT, GID_WHEEL, 0600, "ttyld%r", unit); 1097 com->devs[3] = make_dev(&sio_cdevsw, minorbase | CALLOUT_MASK, 1098 UID_UUCP, GID_DIALER, 0660, "cuaa%r", unit); 1099 com->devs[4] = make_dev(&sio_cdevsw, 1100 minorbase | CALLOUT_MASK | CONTROL_INIT_STATE, 1101 UID_UUCP, GID_DIALER, 0660, "cuaia%r", unit); 1102 com->devs[5] = make_dev(&sio_cdevsw, 1103 minorbase | CALLOUT_MASK | CONTROL_LOCK_STATE, 1104 UID_UUCP, GID_DIALER, 0660, "cuala%r", unit); 1105 for (rid = 0; rid < 6; rid++) 1106 com->devs[rid]->si_drv1 = com; 1107 com->flags = flags; 1108 com->pps.ppscap = PPS_CAPTUREASSERT | PPS_CAPTURECLEAR; 1109 pps_init(&com->pps); 1110 1111 rid = 0; 1112 com->irqres = bus_alloc_resource(dev, SYS_RES_IRQ, &rid, 0ul, ~0ul, 1, 1113 RF_ACTIVE); 1114 if (com->irqres) { 1115 ret = BUS_SETUP_INTR(device_get_parent(dev), dev, com->irqres, 1116 INTR_TYPE_TTY | INTR_FAST, 1117 siointr, com, &com->cookie); 1118 if (ret) { 1119 ret = BUS_SETUP_INTR(device_get_parent(dev), dev, 1120 com->irqres, INTR_TYPE_TTY, 1121 siointr, com, &com->cookie); 1122 if (ret == 0) 1123 device_printf(dev, "unable to activate interrupt in fast mode - using normal mode\n"); 1124 } 1125 if (ret) 1126 device_printf(dev, "could not activate interrupt\n"); 1127#if defined(DDB) && (defined(BREAK_TO_DEBUGGER) || \ 1128 defined(ALT_BREAK_TO_DEBUGGER)) 1129 /* 1130 * Enable interrupts for early break-to-debugger support 1131 * on the console. 1132 */ 1133 if (ret == 0 && unit == comconsole) 1134 outb(siocniobase + com_ier, IER_ERXRDY | IER_ERLS | 1135 IER_EMSC); 1136#endif 1137 } 1138 1139 return (0); 1140} 1141 1142static int 1143sioopen(dev, flag, mode, td) 1144 dev_t dev; 1145 int flag; 1146 int mode; 1147 struct thread *td; 1148{ 1149 struct com_s *com; 1150 int error; 1151 int mynor; 1152 int s; 1153 struct tty *tp; 1154 int unit; 1155 1156 mynor = minor(dev); 1157 unit = MINOR_TO_UNIT(mynor); 1158 com = com_addr(unit); 1159 if (com == NULL) 1160 return (ENXIO); 1161 if (com->gone) 1162 return (ENXIO); 1163 if (mynor & CONTROL_MASK) 1164 return (0); 1165 tp = dev->si_tty = com->tp = ttymalloc(com->tp); 1166 s = spltty(); 1167 /* 1168 * We jump to this label after all non-interrupted sleeps to pick 1169 * up any changes of the device state. 1170 */ 1171open_top: 1172 while (com->state & CS_DTR_OFF) { 1173 error = tsleep(&com->dtr_wait, TTIPRI | PCATCH, "siodtr", 0); 1174 if (com_addr(unit) == NULL) 1175 return (ENXIO); 1176 if (error != 0 || com->gone) 1177 goto out; 1178 } 1179 if (tp->t_state & TS_ISOPEN) { 1180 /* 1181 * The device is open, so everything has been initialized. 1182 * Handle conflicts. 1183 */ 1184 if (mynor & CALLOUT_MASK) { 1185 if (!com->active_out) { 1186 error = EBUSY; 1187 goto out; 1188 } 1189 } else { 1190 if (com->active_out) { 1191 if (flag & O_NONBLOCK) { 1192 error = EBUSY; 1193 goto out; 1194 } 1195 error = tsleep(&com->active_out, 1196 TTIPRI | PCATCH, "siobi", 0); 1197 if (com_addr(unit) == NULL) 1198 return (ENXIO); 1199 if (error != 0 || com->gone) 1200 goto out; 1201 goto open_top; 1202 } 1203 } 1204 if (tp->t_state & TS_XCLUDE && 1205 suser(td)) { 1206 error = EBUSY; 1207 goto out; 1208 } 1209 } else { 1210 /* 1211 * The device isn't open, so there are no conflicts. 1212 * Initialize it. Initialization is done twice in many 1213 * cases: to preempt sleeping callin opens if we are 1214 * callout, and to complete a callin open after DCD rises. 1215 */ 1216 tp->t_oproc = comstart; 1217 tp->t_param = comparam; 1218 tp->t_stop = comstop; 1219 tp->t_dev = dev; 1220 tp->t_termios = mynor & CALLOUT_MASK 1221 ? com->it_out : com->it_in; 1222 (void)commctl(com, TIOCM_DTR | TIOCM_RTS, DMSET); 1223 com->poll = com->no_irq; 1224 com->poll_output = com->loses_outints; 1225 ++com->wopeners; 1226 error = comparam(tp, &tp->t_termios); 1227 --com->wopeners; 1228 if (error != 0) 1229 goto out; 1230 /* 1231 * XXX we should goto open_top if comparam() slept. 1232 */ 1233 if (com->hasfifo) { 1234 int i; 1235 /* 1236 * (Re)enable and drain fifos. 1237 * 1238 * Certain SMC chips cause problems if the fifos 1239 * are enabled while input is ready. Turn off the 1240 * fifo if necessary to clear the input. We test 1241 * the input ready bit after enabling the fifos 1242 * since we've already enabled them in comparam() 1243 * and to handle races between enabling and fresh 1244 * input. 1245 */ 1246 for (i = 0; i < 500; i++) { 1247 sio_setreg(com, com_fifo, 1248 FIFO_RCV_RST | FIFO_XMT_RST 1249 | com->fifo_image); 1250 /* 1251 * XXX the delays are for superstitious 1252 * historical reasons. It must be less than 1253 * the character time at the maximum 1254 * supported speed (87 usec at 115200 bps 1255 * 8N1). Otherwise we might loop endlessly 1256 * if data is streaming in. We used to use 1257 * delays of 100. That usually worked 1258 * because DELAY(100) used to usually delay 1259 * for about 85 usec instead of 100. 1260 */ 1261 DELAY(50); 1262 if (!(inb(com->line_status_port) & LSR_RXRDY)) 1263 break; 1264 sio_setreg(com, com_fifo, 0); 1265 DELAY(50); 1266 (void) inb(com->data_port); 1267 } 1268 if (i == 500) { 1269 error = EIO; 1270 goto out; 1271 } 1272 } 1273 1274 mtx_lock_spin(&sio_lock); 1275 (void) inb(com->line_status_port); 1276 (void) inb(com->data_port); 1277 com->prev_modem_status = com->last_modem_status 1278 = inb(com->modem_status_port); 1279 if (COM_IIR_TXRDYBUG(com->flags)) { 1280 outb(com->intr_ctl_port, IER_ERXRDY | IER_ERLS 1281 | IER_EMSC); 1282 } else { 1283 outb(com->intr_ctl_port, IER_ERXRDY | IER_ETXRDY 1284 | IER_ERLS | IER_EMSC); 1285 } 1286 mtx_unlock_spin(&sio_lock); 1287 /* 1288 * Handle initial DCD. Callout devices get a fake initial 1289 * DCD (trapdoor DCD). If we are callout, then any sleeping 1290 * callin opens get woken up and resume sleeping on "siobi" 1291 * instead of "siodcd". 1292 */ 1293 /* 1294 * XXX `mynor & CALLOUT_MASK' should be 1295 * `tp->t_cflag & (SOFT_CARRIER | TRAPDOOR_CARRIER) where 1296 * TRAPDOOR_CARRIER is the default initial state for callout 1297 * devices and SOFT_CARRIER is like CLOCAL except it hides 1298 * the true carrier. 1299 */ 1300 if (com->prev_modem_status & MSR_DCD || mynor & CALLOUT_MASK) 1301 (*linesw[tp->t_line].l_modem)(tp, 1); 1302 } 1303 /* 1304 * Wait for DCD if necessary. 1305 */ 1306 if (!(tp->t_state & TS_CARR_ON) && !(mynor & CALLOUT_MASK) 1307 && !(tp->t_cflag & CLOCAL) && !(flag & O_NONBLOCK)) { 1308 ++com->wopeners; 1309 error = tsleep(TSA_CARR_ON(tp), TTIPRI | PCATCH, "siodcd", 0); 1310 if (com_addr(unit) == NULL) 1311 return (ENXIO); 1312 --com->wopeners; 1313 if (error != 0 || com->gone) 1314 goto out; 1315 goto open_top; 1316 } 1317 error = (*linesw[tp->t_line].l_open)(dev, tp); 1318 disc_optim(tp, &tp->t_termios, com); 1319 if (tp->t_state & TS_ISOPEN && mynor & CALLOUT_MASK) 1320 com->active_out = TRUE; 1321 siosettimeout(); 1322out: 1323 splx(s); 1324 if (!(tp->t_state & TS_ISOPEN) && com->wopeners == 0) 1325 comhardclose(com); 1326 return (error); 1327} 1328 1329static int 1330sioclose(dev, flag, mode, td) 1331 dev_t dev; 1332 int flag; 1333 int mode; 1334 struct thread *td; 1335{ 1336 struct com_s *com; 1337 int mynor; 1338 int s; 1339 struct tty *tp; 1340 1341 mynor = minor(dev); 1342 if (mynor & CONTROL_MASK) 1343 return (0); 1344 com = com_addr(MINOR_TO_UNIT(mynor)); 1345 if (com == NULL) 1346 return (ENODEV); 1347 tp = com->tp; 1348 s = spltty(); 1349 (*linesw[tp->t_line].l_close)(tp, flag); 1350 disc_optim(tp, &tp->t_termios, com); 1351 comstop(tp, FREAD | FWRITE); 1352 comhardclose(com); 1353 ttyclose(tp); 1354 siosettimeout(); 1355 splx(s); 1356 if (com->gone) { 1357 printf("sio%d: gone\n", com->unit); 1358 s = spltty(); 1359 if (com->ibuf != NULL) 1360 free(com->ibuf, M_DEVBUF); 1361 bzero(tp, sizeof *tp); 1362 splx(s); 1363 } 1364 return (0); 1365} 1366 1367static void 1368comhardclose(com) 1369 struct com_s *com; 1370{ 1371 int s; 1372 struct tty *tp; 1373 int unit; 1374 1375 unit = com->unit; 1376 s = spltty(); 1377 com->poll = FALSE; 1378 com->poll_output = FALSE; 1379 com->do_timestamp = FALSE; 1380 com->do_dcd_timestamp = FALSE; 1381 com->pps.ppsparam.mode = 0; 1382 sio_setreg(com, com_cfcr, com->cfcr_image &= ~CFCR_SBREAK); 1383 tp = com->tp; 1384 1385#if defined(DDB) && (defined(BREAK_TO_DEBUGGER) || \ 1386 defined(ALT_BREAK_TO_DEBUGGER)) 1387 /* 1388 * Leave interrupts enabled and don't clear DTR if this is the 1389 * console. This allows us to detect break-to-debugger events 1390 * while the console device is closed. 1391 */ 1392 if (com->unit != comconsole) 1393#endif 1394 { 1395 sio_setreg(com, com_ier, 0); 1396 if (tp->t_cflag & HUPCL 1397 /* 1398 * XXX we will miss any carrier drop between here and the 1399 * next open. Perhaps we should watch DCD even when the 1400 * port is closed; it is not sufficient to check it at 1401 * the next open because it might go up and down while 1402 * we're not watching. 1403 */ 1404 || (!com->active_out 1405 && !(com->prev_modem_status & MSR_DCD) 1406 && !(com->it_in.c_cflag & CLOCAL)) 1407 || !(tp->t_state & TS_ISOPEN)) { 1408 (void)commctl(com, TIOCM_DTR, DMBIC); 1409 if (com->dtr_wait != 0 && !(com->state & CS_DTR_OFF)) { 1410 timeout(siodtrwakeup, com, com->dtr_wait); 1411 com->state |= CS_DTR_OFF; 1412 } 1413 } 1414 } 1415 if (com->hasfifo) { 1416 /* 1417 * Disable fifos so that they are off after controlled 1418 * reboots. Some BIOSes fail to detect 16550s when the 1419 * fifos are enabled. 1420 */ 1421 sio_setreg(com, com_fifo, 0); 1422 } 1423 com->active_out = FALSE; 1424 wakeup(&com->active_out); 1425 wakeup(TSA_CARR_ON(tp)); /* restart any wopeners */ 1426 splx(s); 1427} 1428 1429static int 1430sioread(dev, uio, flag) 1431 dev_t dev; 1432 struct uio *uio; 1433 int flag; 1434{ 1435 int mynor; 1436 struct com_s *com; 1437 1438 mynor = minor(dev); 1439 if (mynor & CONTROL_MASK) 1440 return (ENODEV); 1441 com = com_addr(MINOR_TO_UNIT(mynor)); 1442 if (com == NULL || com->gone) 1443 return (ENODEV); 1444 return ((*linesw[com->tp->t_line].l_read)(com->tp, uio, flag)); 1445} 1446 1447static int 1448siowrite(dev, uio, flag) 1449 dev_t dev; 1450 struct uio *uio; 1451 int flag; 1452{ 1453 int mynor; 1454 struct com_s *com; 1455 int unit; 1456 1457 mynor = minor(dev); 1458 if (mynor & CONTROL_MASK) 1459 return (ENODEV); 1460 1461 unit = MINOR_TO_UNIT(mynor); 1462 com = com_addr(unit); 1463 if (com == NULL || com->gone) 1464 return (ENODEV); 1465 /* 1466 * (XXX) We disallow virtual consoles if the physical console is 1467 * a serial port. This is in case there is a display attached that 1468 * is not the console. In that situation we don't need/want the X 1469 * server taking over the console. 1470 */ 1471 if (constty != NULL && unit == comconsole) 1472 constty = NULL; 1473 return ((*linesw[com->tp->t_line].l_write)(com->tp, uio, flag)); 1474} 1475 1476static void 1477siobusycheck(chan) 1478 void *chan; 1479{ 1480 struct com_s *com; 1481 int s; 1482 1483 com = (struct com_s *)chan; 1484 1485 /* 1486 * Clear TS_BUSY if low-level output is complete. 1487 * spl locking is sufficient because siointr1() does not set CS_BUSY. 1488 * If siointr1() clears CS_BUSY after we look at it, then we'll get 1489 * called again. Reading the line status port outside of siointr1() 1490 * is safe because CS_BUSY is clear so there are no output interrupts 1491 * to lose. 1492 */ 1493 s = spltty(); 1494 if (com->state & CS_BUSY) 1495 com->extra_state &= ~CSE_BUSYCHECK; /* False alarm. */ 1496 else if ((inb(com->line_status_port) & (LSR_TSRE | LSR_TXRDY)) 1497 == (LSR_TSRE | LSR_TXRDY)) { 1498 com->tp->t_state &= ~TS_BUSY; 1499 ttwwakeup(com->tp); 1500 com->extra_state &= ~CSE_BUSYCHECK; 1501 } else 1502 timeout(siobusycheck, com, hz / 100); 1503 splx(s); 1504} 1505 1506static u_int 1507siodivisor(rclk, speed) 1508 u_long rclk; 1509 speed_t speed; 1510{ 1511 long actual_speed; 1512 u_int divisor; 1513 int error; 1514 1515 if (speed == 0 || speed > (ULONG_MAX - 1) / 8) 1516 return (0); 1517 divisor = (rclk / (8UL * speed) + 1) / 2; 1518 if (divisor == 0 || divisor >= 65536) 1519 return (0); 1520 actual_speed = rclk / (16UL * divisor); 1521 1522 /* 10 times error in percent: */ 1523 error = ((actual_speed - (long)speed) * 2000 / (long)speed + 1) / 2; 1524 1525 /* 3.0% maximum error tolerance: */ 1526 if (error < -30 || error > 30) 1527 return (0); 1528 1529 return (divisor); 1530} 1531 1532static void 1533siodtrwakeup(chan) 1534 void *chan; 1535{ 1536 struct com_s *com; 1537 1538 com = (struct com_s *)chan; 1539 com->state &= ~CS_DTR_OFF; 1540 wakeup(&com->dtr_wait); 1541} 1542 1543/* 1544 * Call this function with the sio_lock mutex held. It will return with the 1545 * lock still held. 1546 */ 1547static void 1548sioinput(com) 1549 struct com_s *com; 1550{ 1551 u_char *buf; 1552 int incc; 1553 u_char line_status; 1554 int recv_data; 1555 struct tty *tp; 1556 1557 buf = com->ibuf; 1558 tp = com->tp; 1559 if (!(tp->t_state & TS_ISOPEN) || !(tp->t_cflag & CREAD)) { 1560 com_events -= (com->iptr - com->ibuf); 1561 com->iptr = com->ibuf; 1562 return; 1563 } 1564 if (tp->t_state & TS_CAN_BYPASS_L_RINT) { 1565 /* 1566 * Avoid the grotesquely inefficient lineswitch routine 1567 * (ttyinput) in "raw" mode. It usually takes about 450 1568 * instructions (that's without canonical processing or echo!). 1569 * slinput is reasonably fast (usually 40 instructions plus 1570 * call overhead). 1571 */ 1572 do { 1573 /* 1574 * This may look odd, but it is using save-and-enable 1575 * semantics instead of the save-and-disable semantics 1576 * that are used everywhere else. 1577 */ 1578 mtx_unlock_spin(&sio_lock); 1579 incc = com->iptr - buf; 1580 if (tp->t_rawq.c_cc + incc > tp->t_ihiwat 1581 && (com->state & CS_RTS_IFLOW 1582 || tp->t_iflag & IXOFF) 1583 && !(tp->t_state & TS_TBLOCK)) 1584 ttyblock(tp); 1585 com->delta_error_counts[CE_TTY_BUF_OVERFLOW] 1586 += b_to_q((char *)buf, incc, &tp->t_rawq); 1587 buf += incc; 1588 tk_nin += incc; 1589 tk_rawcc += incc; 1590 tp->t_rawcc += incc; 1591 ttwakeup(tp); 1592 if (tp->t_state & TS_TTSTOP 1593 && (tp->t_iflag & IXANY 1594 || tp->t_cc[VSTART] == tp->t_cc[VSTOP])) { 1595 tp->t_state &= ~TS_TTSTOP; 1596 tp->t_lflag &= ~FLUSHO; 1597 comstart(tp); 1598 } 1599 mtx_lock_spin(&sio_lock); 1600 } while (buf < com->iptr); 1601 } else { 1602 do { 1603 /* 1604 * This may look odd, but it is using save-and-enable 1605 * semantics instead of the save-and-disable semantics 1606 * that are used everywhere else. 1607 */ 1608 mtx_unlock_spin(&sio_lock); 1609 line_status = buf[com->ierroff]; 1610 recv_data = *buf++; 1611 if (line_status 1612 & (LSR_BI | LSR_FE | LSR_OE | LSR_PE)) { 1613 if (line_status & LSR_BI) 1614 recv_data |= TTY_BI; 1615 if (line_status & LSR_FE) 1616 recv_data |= TTY_FE; 1617 if (line_status & LSR_OE) 1618 recv_data |= TTY_OE; 1619 if (line_status & LSR_PE) 1620 recv_data |= TTY_PE; 1621 } 1622 (*linesw[tp->t_line].l_rint)(recv_data, tp); 1623 mtx_lock_spin(&sio_lock); 1624 } while (buf < com->iptr); 1625 } 1626 com_events -= (com->iptr - com->ibuf); 1627 com->iptr = com->ibuf; 1628 1629 /* 1630 * There is now room for another low-level buffer full of input, 1631 * so enable RTS if it is now disabled and there is room in the 1632 * high-level buffer. 1633 */ 1634 if ((com->state & CS_RTS_IFLOW) && !(com->mcr_image & MCR_RTS) && 1635 !(tp->t_state & TS_TBLOCK)) 1636 outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS); 1637} 1638 1639static void 1640siointr(arg) 1641 void *arg; 1642{ 1643 struct com_s *com; 1644 1645#ifndef COM_MULTIPORT 1646 com = (struct com_s *)arg; 1647 1648 mtx_lock_spin(&sio_lock); 1649 siointr1(com); 1650 mtx_unlock_spin(&sio_lock); 1651#else /* COM_MULTIPORT */ 1652 bool_t possibly_more_intrs; 1653 int unit; 1654 1655 /* 1656 * Loop until there is no activity on any port. This is necessary 1657 * to get an interrupt edge more than to avoid another interrupt. 1658 * If the IRQ signal is just an OR of the IRQ signals from several 1659 * devices, then the edge from one may be lost because another is 1660 * on. 1661 */ 1662 mtx_lock_spin(&sio_lock); 1663 do { 1664 possibly_more_intrs = FALSE; 1665 for (unit = 0; unit < sio_numunits; ++unit) { 1666 com = com_addr(unit); 1667 /* 1668 * XXX COM_LOCK(); 1669 * would it work here, or be counter-productive? 1670 */ 1671 if (com != NULL 1672 && !com->gone 1673 && (inb(com->int_id_port) & IIR_IMASK) 1674 != IIR_NOPEND) { 1675 siointr1(com); 1676 possibly_more_intrs = TRUE; 1677 } 1678 /* XXX COM_UNLOCK(); */ 1679 } 1680 } while (possibly_more_intrs); 1681 mtx_unlock_spin(&sio_lock); 1682#endif /* COM_MULTIPORT */ 1683} 1684 1685static struct timespec siots[8192]; 1686static int siotso; 1687static int volatile siotsunit = -1; 1688 1689static int 1690sysctl_siots(SYSCTL_HANDLER_ARGS) 1691{ 1692 char buf[128]; 1693 long long delta; 1694 size_t len; 1695 int error, i; 1696 1697 for (i = 1; i < siotso; i++) { 1698 delta = (long long)(siots[i].tv_sec - siots[i - 1].tv_sec) * 1699 1000000000 + 1700 (siots[i].tv_nsec - siots[i - 1].tv_nsec); 1701 len = sprintf(buf, "%lld\n", delta); 1702 if (delta >= 110000) 1703 len += sprintf(buf + len - 1, ": *** %ld.%09ld\n", 1704 (long)siots[i].tv_sec, siots[i].tv_nsec); 1705 if (i == siotso - 1) 1706 buf[len - 1] = '\0'; 1707 error = SYSCTL_OUT(req, buf, len); 1708 if (error != 0) 1709 return (error); 1710 uio_yield(); 1711 } 1712 return (0); 1713} 1714 1715SYSCTL_PROC(_machdep, OID_AUTO, siots, CTLTYPE_STRING | CTLFLAG_RD, 1716 0, 0, sysctl_siots, "A", "sio timestamps"); 1717 1718static void 1719siointr1(com) 1720 struct com_s *com; 1721{ 1722 u_char line_status; 1723 u_char modem_status; 1724 u_char *ioptr; 1725 u_char recv_data; 1726 u_char int_ctl; 1727 u_char int_ctl_new; 1728 1729 int_ctl = inb(com->intr_ctl_port); 1730 int_ctl_new = int_ctl; 1731 1732 while (!com->gone) { 1733 if (com->pps.ppsparam.mode & PPS_CAPTUREBOTH) { 1734 modem_status = inb(com->modem_status_port); 1735 if ((modem_status ^ com->last_modem_status) & MSR_DCD) { 1736 pps_capture(&com->pps); 1737 pps_event(&com->pps, (modem_status & MSR_DCD) ? 1738 PPS_CAPTUREASSERT : PPS_CAPTURECLEAR); 1739 } 1740 } 1741 line_status = inb(com->line_status_port); 1742 1743 /* input event? (check first to help avoid overruns) */ 1744 while (line_status & LSR_RCV_MASK) { 1745 /* break/unnattached error bits or real input? */ 1746 if (!(line_status & LSR_RXRDY)) 1747 recv_data = 0; 1748 else 1749 recv_data = inb(com->data_port); 1750#if defined(DDB) && defined(ALT_BREAK_TO_DEBUGGER) 1751 /* 1752 * Solaris implements a new BREAK which is initiated 1753 * by a character sequence CR ~ ^b which is similar 1754 * to a familiar pattern used on Sun servers by the 1755 * Remote Console. 1756 */ 1757#define KEY_CRTLB 2 /* ^B */ 1758#define KEY_CR 13 /* CR '\r' */ 1759#define KEY_TILDE 126 /* ~ */ 1760 1761 if (com->unit == comconsole) { 1762 static int brk_state1 = 0, brk_state2 = 0; 1763 if (recv_data == KEY_CR) { 1764 brk_state1 = recv_data; 1765 brk_state2 = 0; 1766 } else if (brk_state1 == KEY_CR 1767 && (recv_data == KEY_TILDE 1768 || recv_data == KEY_CRTLB)) { 1769 if (recv_data == KEY_TILDE) 1770 brk_state2 = recv_data; 1771 else if (brk_state2 == KEY_TILDE 1772 && recv_data == KEY_CRTLB) { 1773 breakpoint(); 1774 brk_state1 = 0; 1775 brk_state2 = 0; 1776 goto cont; 1777 } else 1778 brk_state2 = 0; 1779 } else 1780 brk_state1 = 0; 1781 } 1782#endif 1783 if (line_status & (LSR_BI | LSR_FE | LSR_PE)) { 1784 /* 1785 * Don't store BI if IGNBRK or FE/PE if IGNPAR. 1786 * Otherwise, push the work to a higher level 1787 * (to handle PARMRK) if we're bypassing. 1788 * Otherwise, convert BI/FE and PE+INPCK to 0. 1789 * 1790 * This makes bypassing work right in the 1791 * usual "raw" case (IGNBRK set, and IGNPAR 1792 * and INPCK clear). 1793 * 1794 * Note: BI together with FE/PE means just BI. 1795 */ 1796 if (line_status & LSR_BI) { 1797#if defined(DDB) && defined(BREAK_TO_DEBUGGER) 1798 if (com->unit == comconsole) { 1799 breakpoint(); 1800 goto cont; 1801 } 1802#endif 1803 if (com->tp == NULL 1804 || com->tp->t_iflag & IGNBRK) 1805 goto cont; 1806 } else { 1807 if (com->tp == NULL 1808 || com->tp->t_iflag & IGNPAR) 1809 goto cont; 1810 } 1811 if (com->tp->t_state & TS_CAN_BYPASS_L_RINT 1812 && (line_status & (LSR_BI | LSR_FE) 1813 || com->tp->t_iflag & INPCK)) 1814 recv_data = 0; 1815 } 1816 ++com->bytes_in; 1817 if (com->hotchar != 0 && recv_data == com->hotchar) 1818 swi_sched(sio_fast_ih, 0); 1819 ioptr = com->iptr; 1820 if (ioptr >= com->ibufend) 1821 CE_RECORD(com, CE_INTERRUPT_BUF_OVERFLOW); 1822 else { 1823 if (com->do_timestamp) 1824 microtime(&com->timestamp); 1825 ++com_events; 1826 swi_sched(sio_slow_ih, SWI_DELAY); 1827#if 0 /* for testing input latency vs efficiency */ 1828if (com->iptr - com->ibuf == 8) 1829 swi_sched(sio_fast_ih, 0); 1830#endif 1831 ioptr[0] = recv_data; 1832 ioptr[com->ierroff] = line_status; 1833 com->iptr = ++ioptr; 1834 if (ioptr == com->ihighwater 1835 && com->state & CS_RTS_IFLOW) 1836 outb(com->modem_ctl_port, 1837 com->mcr_image &= ~MCR_RTS); 1838 if (line_status & LSR_OE) 1839 CE_RECORD(com, CE_OVERRUN); 1840 } 1841cont: 1842 /* 1843 * "& 0x7F" is to avoid the gcc-1.40 generating a slow 1844 * jump from the top of the loop to here 1845 */ 1846 line_status = inb(com->line_status_port) & 0x7F; 1847 } 1848 1849 /* modem status change? (always check before doing output) */ 1850 modem_status = inb(com->modem_status_port); 1851 if (modem_status != com->last_modem_status) { 1852 if (com->do_dcd_timestamp 1853 && !(com->last_modem_status & MSR_DCD) 1854 && modem_status & MSR_DCD) 1855 microtime(&com->dcd_timestamp); 1856 1857 /* 1858 * Schedule high level to handle DCD changes. Note 1859 * that we don't use the delta bits anywhere. Some 1860 * UARTs mess them up, and it's easy to remember the 1861 * previous bits and calculate the delta. 1862 */ 1863 com->last_modem_status = modem_status; 1864 if (!(com->state & CS_CHECKMSR)) { 1865 com_events += LOTS_OF_EVENTS; 1866 com->state |= CS_CHECKMSR; 1867 swi_sched(sio_fast_ih, 0); 1868 } 1869 1870 /* handle CTS change immediately for crisp flow ctl */ 1871 if (com->state & CS_CTS_OFLOW) { 1872 if (modem_status & MSR_CTS) 1873 com->state |= CS_ODEVREADY; 1874 else 1875 com->state &= ~CS_ODEVREADY; 1876 } 1877 } 1878 1879 /* output queued and everything ready? */ 1880 if (line_status & LSR_TXRDY 1881 && com->state >= (CS_BUSY | CS_TTGO | CS_ODEVREADY)) { 1882 ioptr = com->obufq.l_head; 1883 if (com->tx_fifo_size > 1 && com->unit != siotsunit) { 1884 u_int ocount; 1885 1886 ocount = com->obufq.l_tail - ioptr; 1887 if (ocount > com->tx_fifo_size) 1888 ocount = com->tx_fifo_size; 1889 com->bytes_out += ocount; 1890 do 1891 outb(com->data_port, *ioptr++); 1892 while (--ocount != 0); 1893 } else { 1894 outb(com->data_port, *ioptr++); 1895 ++com->bytes_out; 1896 if (com->unit == siotsunit) { 1897 nanouptime(&siots[siotso]); 1898 siotso = (siotso + 1) % 1899 (sizeof siots / sizeof siots[0]); 1900 } 1901 } 1902 com->obufq.l_head = ioptr; 1903 if (COM_IIR_TXRDYBUG(com->flags)) { 1904 int_ctl_new = int_ctl | IER_ETXRDY; 1905 } 1906 if (ioptr >= com->obufq.l_tail) { 1907 struct lbq *qp; 1908 1909 qp = com->obufq.l_next; 1910 qp->l_queued = FALSE; 1911 qp = qp->l_next; 1912 if (qp != NULL) { 1913 com->obufq.l_head = qp->l_head; 1914 com->obufq.l_tail = qp->l_tail; 1915 com->obufq.l_next = qp; 1916 } else { 1917 /* output just completed */ 1918 if (COM_IIR_TXRDYBUG(com->flags)) { 1919 int_ctl_new = int_ctl & ~IER_ETXRDY; 1920 } 1921 com->state &= ~CS_BUSY; 1922 } 1923 if (!(com->state & CS_ODONE)) { 1924 com_events += LOTS_OF_EVENTS; 1925 com->state |= CS_ODONE; 1926 /* handle at high level ASAP */ 1927 swi_sched(sio_fast_ih, 0); 1928 } 1929 } 1930 if (COM_IIR_TXRDYBUG(com->flags) && (int_ctl != int_ctl_new)) { 1931 outb(com->intr_ctl_port, int_ctl_new); 1932 } 1933 } 1934 1935 /* finished? */ 1936#ifndef COM_MULTIPORT 1937 if ((inb(com->int_id_port) & IIR_IMASK) == IIR_NOPEND) 1938#endif /* COM_MULTIPORT */ 1939 return; 1940 } 1941} 1942 1943static int 1944sioioctl(dev, cmd, data, flag, td) 1945 dev_t dev; 1946 u_long cmd; 1947 caddr_t data; 1948 int flag; 1949 struct thread *td; 1950{ 1951 struct com_s *com; 1952 int error; 1953 int mynor; 1954 int s; 1955 struct tty *tp; 1956#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 1957 u_long oldcmd; 1958 struct termios term; 1959#endif 1960 1961 mynor = minor(dev); 1962 com = com_addr(MINOR_TO_UNIT(mynor)); 1963 if (com == NULL || com->gone) 1964 return (ENODEV); 1965 if (mynor & CONTROL_MASK) { 1966 struct termios *ct; 1967 1968 switch (mynor & CONTROL_MASK) { 1969 case CONTROL_INIT_STATE: 1970 ct = mynor & CALLOUT_MASK ? &com->it_out : &com->it_in; 1971 break; 1972 case CONTROL_LOCK_STATE: 1973 ct = mynor & CALLOUT_MASK ? &com->lt_out : &com->lt_in; 1974 break; 1975 default: 1976 return (ENODEV); /* /dev/nodev */ 1977 } 1978 switch (cmd) { 1979 case TIOCSETA: 1980 error = suser(td); 1981 if (error != 0) 1982 return (error); 1983 *ct = *(struct termios *)data; 1984 return (0); 1985 case TIOCGETA: 1986 *(struct termios *)data = *ct; 1987 return (0); 1988 case TIOCGETD: 1989 *(int *)data = TTYDISC; 1990 return (0); 1991 case TIOCGWINSZ: 1992 bzero(data, sizeof(struct winsize)); 1993 return (0); 1994 default: 1995 return (ENOTTY); 1996 } 1997 } 1998 tp = com->tp; 1999#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 2000 term = tp->t_termios; 2001 oldcmd = cmd; 2002 error = ttsetcompat(tp, &cmd, data, &term); 2003 if (error != 0) 2004 return (error); 2005 if (cmd != oldcmd) 2006 data = (caddr_t)&term; 2007#endif 2008 if (cmd == TIOCSETA || cmd == TIOCSETAW || cmd == TIOCSETAF) { 2009 int cc; 2010 struct termios *dt = (struct termios *)data; 2011 struct termios *lt = mynor & CALLOUT_MASK 2012 ? &com->lt_out : &com->lt_in; 2013 2014 dt->c_iflag = (tp->t_iflag & lt->c_iflag) 2015 | (dt->c_iflag & ~lt->c_iflag); 2016 dt->c_oflag = (tp->t_oflag & lt->c_oflag) 2017 | (dt->c_oflag & ~lt->c_oflag); 2018 dt->c_cflag = (tp->t_cflag & lt->c_cflag) 2019 | (dt->c_cflag & ~lt->c_cflag); 2020 dt->c_lflag = (tp->t_lflag & lt->c_lflag) 2021 | (dt->c_lflag & ~lt->c_lflag); 2022 for (cc = 0; cc < NCCS; ++cc) 2023 if (lt->c_cc[cc] != 0) 2024 dt->c_cc[cc] = tp->t_cc[cc]; 2025 if (lt->c_ispeed != 0) 2026 dt->c_ispeed = tp->t_ispeed; 2027 if (lt->c_ospeed != 0) 2028 dt->c_ospeed = tp->t_ospeed; 2029 } 2030 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, td); 2031 if (error != ENOIOCTL) 2032 return (error); 2033 s = spltty(); 2034 error = ttioctl(tp, cmd, data, flag); 2035 disc_optim(tp, &tp->t_termios, com); 2036 if (error != ENOIOCTL) { 2037 splx(s); 2038 return (error); 2039 } 2040 switch (cmd) { 2041 case TIOCSBRK: 2042 sio_setreg(com, com_cfcr, com->cfcr_image |= CFCR_SBREAK); 2043 break; 2044 case TIOCCBRK: 2045 sio_setreg(com, com_cfcr, com->cfcr_image &= ~CFCR_SBREAK); 2046 break; 2047 case TIOCSDTR: 2048 (void)commctl(com, TIOCM_DTR, DMBIS); 2049 break; 2050 case TIOCCDTR: 2051 (void)commctl(com, TIOCM_DTR, DMBIC); 2052 break; 2053 /* 2054 * XXX should disallow changing MCR_RTS if CS_RTS_IFLOW is set. The 2055 * changes get undone on the next call to comparam(). 2056 */ 2057 case TIOCMSET: 2058 (void)commctl(com, *(int *)data, DMSET); 2059 break; 2060 case TIOCMBIS: 2061 (void)commctl(com, *(int *)data, DMBIS); 2062 break; 2063 case TIOCMBIC: 2064 (void)commctl(com, *(int *)data, DMBIC); 2065 break; 2066 case TIOCMGET: 2067 *(int *)data = commctl(com, 0, DMGET); 2068 break; 2069 case TIOCMSDTRWAIT: 2070 /* must be root since the wait applies to following logins */ 2071 error = suser(td); 2072 if (error != 0) { 2073 splx(s); 2074 return (error); 2075 } 2076 com->dtr_wait = *(int *)data * hz / 100; 2077 break; 2078 case TIOCMGDTRWAIT: 2079 *(int *)data = com->dtr_wait * 100 / hz; 2080 break; 2081 case TIOCTIMESTAMP: 2082 com->do_timestamp = TRUE; 2083 *(struct timeval *)data = com->timestamp; 2084 break; 2085 case TIOCDCDTIMESTAMP: 2086 com->do_dcd_timestamp = TRUE; 2087 *(struct timeval *)data = com->dcd_timestamp; 2088 break; 2089 default: 2090 splx(s); 2091 error = pps_ioctl(cmd, data, &com->pps); 2092 if (error == ENODEV) 2093 error = ENOTTY; 2094 return (error); 2095 } 2096 splx(s); 2097 return (0); 2098} 2099 2100/* software interrupt handler for SWI_TTY */ 2101static void 2102siopoll(void *dummy) 2103{ 2104 int unit; 2105 2106 if (com_events == 0) 2107 return; 2108repeat: 2109 for (unit = 0; unit < sio_numunits; ++unit) { 2110 struct com_s *com; 2111 int incc; 2112 struct tty *tp; 2113 2114 com = com_addr(unit); 2115 if (com == NULL) 2116 continue; 2117 tp = com->tp; 2118 if (tp == NULL || com->gone) { 2119 /* 2120 * Discard any events related to never-opened or 2121 * going-away devices. 2122 */ 2123 mtx_lock_spin(&sio_lock); 2124 incc = com->iptr - com->ibuf; 2125 com->iptr = com->ibuf; 2126 if (com->state & CS_CHECKMSR) { 2127 incc += LOTS_OF_EVENTS; 2128 com->state &= ~CS_CHECKMSR; 2129 } 2130 com_events -= incc; 2131 mtx_unlock_spin(&sio_lock); 2132 continue; 2133 } 2134 if (com->iptr != com->ibuf) { 2135 mtx_lock_spin(&sio_lock); 2136 sioinput(com); 2137 mtx_unlock_spin(&sio_lock); 2138 } 2139 if (com->state & CS_CHECKMSR) { 2140 u_char delta_modem_status; 2141 2142 mtx_lock_spin(&sio_lock); 2143 delta_modem_status = com->last_modem_status 2144 ^ com->prev_modem_status; 2145 com->prev_modem_status = com->last_modem_status; 2146 com_events -= LOTS_OF_EVENTS; 2147 com->state &= ~CS_CHECKMSR; 2148 mtx_unlock_spin(&sio_lock); 2149 if (delta_modem_status & MSR_DCD) 2150 (*linesw[tp->t_line].l_modem) 2151 (tp, com->prev_modem_status & MSR_DCD); 2152 } 2153 if (com->state & CS_ODONE) { 2154 mtx_lock_spin(&sio_lock); 2155 com_events -= LOTS_OF_EVENTS; 2156 com->state &= ~CS_ODONE; 2157 mtx_unlock_spin(&sio_lock); 2158 if (!(com->state & CS_BUSY) 2159 && !(com->extra_state & CSE_BUSYCHECK)) { 2160 timeout(siobusycheck, com, hz / 100); 2161 com->extra_state |= CSE_BUSYCHECK; 2162 } 2163 (*linesw[tp->t_line].l_start)(tp); 2164 } 2165 if (com_events == 0) 2166 break; 2167 } 2168 if (com_events >= LOTS_OF_EVENTS) 2169 goto repeat; 2170} 2171 2172static int 2173comparam(tp, t) 2174 struct tty *tp; 2175 struct termios *t; 2176{ 2177 u_int cfcr; 2178 int cflag; 2179 struct com_s *com; 2180 u_int divisor; 2181 u_char dlbh; 2182 u_char dlbl; 2183 int s; 2184 int unit; 2185 2186 unit = DEV_TO_UNIT(tp->t_dev); 2187 com = com_addr(unit); 2188 if (com == NULL) 2189 return (ENODEV); 2190 2191 /* do historical conversions */ 2192 if (t->c_ispeed == 0) 2193 t->c_ispeed = t->c_ospeed; 2194 2195 /* check requested parameters */ 2196 if (t->c_ospeed == 0) 2197 divisor = 0; 2198 else { 2199 if (t->c_ispeed != t->c_ospeed) 2200 return (EINVAL); 2201 divisor = siodivisor(com->rclk, t->c_ispeed); 2202 if (divisor == 0) 2203 return (EINVAL); 2204 } 2205 2206 /* parameters are OK, convert them to the com struct and the device */ 2207 s = spltty(); 2208 if (divisor == 0) 2209 (void)commctl(com, TIOCM_DTR, DMBIC); /* hang up line */ 2210 else 2211 (void)commctl(com, TIOCM_DTR, DMBIS); 2212 cflag = t->c_cflag; 2213 switch (cflag & CSIZE) { 2214 case CS5: 2215 cfcr = CFCR_5BITS; 2216 break; 2217 case CS6: 2218 cfcr = CFCR_6BITS; 2219 break; 2220 case CS7: 2221 cfcr = CFCR_7BITS; 2222 break; 2223 default: 2224 cfcr = CFCR_8BITS; 2225 break; 2226 } 2227 if (cflag & PARENB) { 2228 cfcr |= CFCR_PENAB; 2229 if (!(cflag & PARODD)) 2230 cfcr |= CFCR_PEVEN; 2231 } 2232 if (cflag & CSTOPB) 2233 cfcr |= CFCR_STOPB; 2234 2235 if (com->hasfifo && divisor != 0) { 2236 /* 2237 * Use a fifo trigger level low enough so that the input 2238 * latency from the fifo is less than about 16 msec and 2239 * the total latency is less than about 30 msec. These 2240 * latencies are reasonable for humans. Serial comms 2241 * protocols shouldn't expect anything better since modem 2242 * latencies are larger. 2243 * 2244 * The fifo trigger level cannot be set at RX_HIGH for high 2245 * speed connections without further work on reducing 2246 * interrupt disablement times in other parts of the system, 2247 * without producing silo overflow errors. 2248 */ 2249 com->fifo_image = com->unit == siotsunit ? 0 2250 : t->c_ospeed <= 4800 2251 ? FIFO_ENABLE : FIFO_ENABLE | FIFO_RX_MEDH; 2252#ifdef COM_ESP 2253 /* 2254 * The Hayes ESP card needs the fifo DMA mode bit set 2255 * in compatibility mode. If not, it will interrupt 2256 * for each character received. 2257 */ 2258 if (com->esp) 2259 com->fifo_image |= FIFO_DMA_MODE; 2260#endif 2261 sio_setreg(com, com_fifo, com->fifo_image); 2262 } 2263 2264 /* 2265 * This returns with interrupts disabled so that we can complete 2266 * the speed change atomically. Keeping interrupts disabled is 2267 * especially important while com_data is hidden. 2268 */ 2269 (void) siosetwater(com, t->c_ispeed); 2270 2271 if (divisor != 0) { 2272 sio_setreg(com, com_cfcr, cfcr | CFCR_DLAB); 2273 /* 2274 * Only set the divisor registers if they would change, 2275 * since on some 16550 incompatibles (UMC8669F), setting 2276 * them while input is arriving them loses sync until 2277 * data stops arriving. 2278 */ 2279 dlbl = divisor & 0xFF; 2280 if (sio_getreg(com, com_dlbl) != dlbl) 2281 sio_setreg(com, com_dlbl, dlbl); 2282 dlbh = divisor >> 8; 2283 if (sio_getreg(com, com_dlbh) != dlbh) 2284 sio_setreg(com, com_dlbh, dlbh); 2285 } 2286 2287 sio_setreg(com, com_cfcr, com->cfcr_image = cfcr); 2288 2289 if (!(tp->t_state & TS_TTSTOP)) 2290 com->state |= CS_TTGO; 2291 2292 if (cflag & CRTS_IFLOW) { 2293 if (com->st16650a) { 2294 sio_setreg(com, com_cfcr, 0xbf); 2295 sio_setreg(com, com_fifo, 2296 sio_getreg(com, com_fifo) | 0x40); 2297 } 2298 com->state |= CS_RTS_IFLOW; 2299 /* 2300 * If CS_RTS_IFLOW just changed from off to on, the change 2301 * needs to be propagated to MCR_RTS. This isn't urgent, 2302 * so do it later by calling comstart() instead of repeating 2303 * a lot of code from comstart() here. 2304 */ 2305 } else if (com->state & CS_RTS_IFLOW) { 2306 com->state &= ~CS_RTS_IFLOW; 2307 /* 2308 * CS_RTS_IFLOW just changed from on to off. Force MCR_RTS 2309 * on here, since comstart() won't do it later. 2310 */ 2311 outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS); 2312 if (com->st16650a) { 2313 sio_setreg(com, com_cfcr, 0xbf); 2314 sio_setreg(com, com_fifo, 2315 sio_getreg(com, com_fifo) & ~0x40); 2316 } 2317 } 2318 2319 2320 /* 2321 * Set up state to handle output flow control. 2322 * XXX - worth handling MDMBUF (DCD) flow control at the lowest level? 2323 * Now has 10+ msec latency, while CTS flow has 50- usec latency. 2324 */ 2325 com->state |= CS_ODEVREADY; 2326 com->state &= ~CS_CTS_OFLOW; 2327 if (cflag & CCTS_OFLOW) { 2328 com->state |= CS_CTS_OFLOW; 2329 if (!(com->last_modem_status & MSR_CTS)) 2330 com->state &= ~CS_ODEVREADY; 2331 if (com->st16650a) { 2332 sio_setreg(com, com_cfcr, 0xbf); 2333 sio_setreg(com, com_fifo, 2334 sio_getreg(com, com_fifo) | 0x80); 2335 } 2336 } else { 2337 if (com->st16650a) { 2338 sio_setreg(com, com_cfcr, 0xbf); 2339 sio_setreg(com, com_fifo, 2340 sio_getreg(com, com_fifo) & ~0x80); 2341 } 2342 } 2343 2344 sio_setreg(com, com_cfcr, com->cfcr_image); 2345 2346 /* XXX shouldn't call functions while intrs are disabled. */ 2347 disc_optim(tp, t, com); 2348 /* 2349 * Recover from fiddling with CS_TTGO. We used to call siointr1() 2350 * unconditionally, but that defeated the careful discarding of 2351 * stale input in sioopen(). 2352 */ 2353 if (com->state >= (CS_BUSY | CS_TTGO)) 2354 siointr1(com); 2355 2356 mtx_unlock_spin(&sio_lock); 2357 splx(s); 2358 comstart(tp); 2359 if (com->ibufold != NULL) { 2360 free(com->ibufold, M_DEVBUF); 2361 com->ibufold = NULL; 2362 } 2363 return (0); 2364} 2365 2366/* 2367 * This function must be called with the sio_lock mutex released and will 2368 * return with it obtained. 2369 */ 2370static int 2371siosetwater(com, speed) 2372 struct com_s *com; 2373 speed_t speed; 2374{ 2375 int cp4ticks; 2376 u_char *ibuf; 2377 int ibufsize; 2378 struct tty *tp; 2379 2380 /* 2381 * Make the buffer size large enough to handle a softtty interrupt 2382 * latency of about 2 ticks without loss of throughput or data 2383 * (about 3 ticks if input flow control is not used or not honoured, 2384 * but a bit less for CS5-CS7 modes). 2385 */ 2386 cp4ticks = speed / 10 / hz * 4; 2387 for (ibufsize = 128; ibufsize < cp4ticks;) 2388 ibufsize <<= 1; 2389 if (ibufsize == com->ibufsize) { 2390 mtx_lock_spin(&sio_lock); 2391 return (0); 2392 } 2393 2394 /* 2395 * Allocate input buffer. The extra factor of 2 in the size is 2396 * to allow for an error byte for each input byte. 2397 */ 2398 ibuf = malloc(2 * ibufsize, M_DEVBUF, M_NOWAIT); 2399 if (ibuf == NULL) { 2400 mtx_lock_spin(&sio_lock); 2401 return (ENOMEM); 2402 } 2403 2404 /* Initialize non-critical variables. */ 2405 com->ibufold = com->ibuf; 2406 com->ibufsize = ibufsize; 2407 tp = com->tp; 2408 if (tp != NULL) { 2409 tp->t_ififosize = 2 * ibufsize; 2410 tp->t_ispeedwat = (speed_t)-1; 2411 tp->t_ospeedwat = (speed_t)-1; 2412 } 2413 2414 /* 2415 * Read current input buffer, if any. Continue with interrupts 2416 * disabled. 2417 */ 2418 mtx_lock_spin(&sio_lock); 2419 if (com->iptr != com->ibuf) 2420 sioinput(com); 2421 2422 /*- 2423 * Initialize critical variables, including input buffer watermarks. 2424 * The external device is asked to stop sending when the buffer 2425 * exactly reaches high water, or when the high level requests it. 2426 * The high level is notified immediately (rather than at a later 2427 * clock tick) when this watermark is reached. 2428 * The buffer size is chosen so the watermark should almost never 2429 * be reached. 2430 * The low watermark is invisibly 0 since the buffer is always 2431 * emptied all at once. 2432 */ 2433 com->iptr = com->ibuf = ibuf; 2434 com->ibufend = ibuf + ibufsize; 2435 com->ierroff = ibufsize; 2436 com->ihighwater = ibuf + 3 * ibufsize / 4; 2437 return (0); 2438} 2439 2440static void 2441comstart(tp) 2442 struct tty *tp; 2443{ 2444 struct com_s *com; 2445 int s; 2446 int unit; 2447 2448 unit = DEV_TO_UNIT(tp->t_dev); 2449 com = com_addr(unit); 2450 if (com == NULL) 2451 return; 2452 s = spltty(); 2453 mtx_lock_spin(&sio_lock); 2454 if (tp->t_state & TS_TTSTOP) 2455 com->state &= ~CS_TTGO; 2456 else 2457 com->state |= CS_TTGO; 2458 if (tp->t_state & TS_TBLOCK) { 2459 if (com->mcr_image & MCR_RTS && com->state & CS_RTS_IFLOW) 2460 outb(com->modem_ctl_port, com->mcr_image &= ~MCR_RTS); 2461 } else { 2462 if (!(com->mcr_image & MCR_RTS) && com->iptr < com->ihighwater 2463 && com->state & CS_RTS_IFLOW) 2464 outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS); 2465 } 2466 mtx_unlock_spin(&sio_lock); 2467 if (tp->t_state & (TS_TIMEOUT | TS_TTSTOP)) { 2468 ttwwakeup(tp); 2469 splx(s); 2470 return; 2471 } 2472 if (tp->t_outq.c_cc != 0) { 2473 struct lbq *qp; 2474 struct lbq *next; 2475 2476 if (!com->obufs[0].l_queued) { 2477 com->obufs[0].l_tail 2478 = com->obuf1 + q_to_b(&tp->t_outq, com->obuf1, 2479 sizeof com->obuf1); 2480 com->obufs[0].l_next = NULL; 2481 com->obufs[0].l_queued = TRUE; 2482 mtx_lock_spin(&sio_lock); 2483 if (com->state & CS_BUSY) { 2484 qp = com->obufq.l_next; 2485 while ((next = qp->l_next) != NULL) 2486 qp = next; 2487 qp->l_next = &com->obufs[0]; 2488 } else { 2489 com->obufq.l_head = com->obufs[0].l_head; 2490 com->obufq.l_tail = com->obufs[0].l_tail; 2491 com->obufq.l_next = &com->obufs[0]; 2492 com->state |= CS_BUSY; 2493 } 2494 mtx_unlock_spin(&sio_lock); 2495 } 2496 if (tp->t_outq.c_cc != 0 && !com->obufs[1].l_queued) { 2497 com->obufs[1].l_tail 2498 = com->obuf2 + q_to_b(&tp->t_outq, com->obuf2, 2499 sizeof com->obuf2); 2500 com->obufs[1].l_next = NULL; 2501 com->obufs[1].l_queued = TRUE; 2502 mtx_lock_spin(&sio_lock); 2503 if (com->state & CS_BUSY) { 2504 qp = com->obufq.l_next; 2505 while ((next = qp->l_next) != NULL) 2506 qp = next; 2507 qp->l_next = &com->obufs[1]; 2508 } else { 2509 com->obufq.l_head = com->obufs[1].l_head; 2510 com->obufq.l_tail = com->obufs[1].l_tail; 2511 com->obufq.l_next = &com->obufs[1]; 2512 com->state |= CS_BUSY; 2513 } 2514 mtx_unlock_spin(&sio_lock); 2515 } 2516 tp->t_state |= TS_BUSY; 2517 } 2518 mtx_lock_spin(&sio_lock); 2519 if (com->state >= (CS_BUSY | CS_TTGO)) 2520 siointr1(com); /* fake interrupt to start output */ 2521 mtx_unlock_spin(&sio_lock); 2522 ttwwakeup(tp); 2523 splx(s); 2524} 2525 2526static void 2527comstop(tp, rw) 2528 struct tty *tp; 2529 int rw; 2530{ 2531 struct com_s *com; 2532 2533 com = com_addr(DEV_TO_UNIT(tp->t_dev)); 2534 if (com == NULL || com->gone) 2535 return; 2536 mtx_lock_spin(&sio_lock); 2537 if (rw & FWRITE) { 2538 if (com->hasfifo) 2539#ifdef COM_ESP 2540 /* XXX avoid h/w bug. */ 2541 if (!com->esp) 2542#endif 2543 sio_setreg(com, com_fifo, 2544 FIFO_XMT_RST | com->fifo_image); 2545 com->obufs[0].l_queued = FALSE; 2546 com->obufs[1].l_queued = FALSE; 2547 if (com->state & CS_ODONE) 2548 com_events -= LOTS_OF_EVENTS; 2549 com->state &= ~(CS_ODONE | CS_BUSY); 2550 com->tp->t_state &= ~TS_BUSY; 2551 } 2552 if (rw & FREAD) { 2553 if (com->hasfifo) 2554#ifdef COM_ESP 2555 /* XXX avoid h/w bug. */ 2556 if (!com->esp) 2557#endif 2558 sio_setreg(com, com_fifo, 2559 FIFO_RCV_RST | com->fifo_image); 2560 com_events -= (com->iptr - com->ibuf); 2561 com->iptr = com->ibuf; 2562 } 2563 mtx_unlock_spin(&sio_lock); 2564 comstart(tp); 2565} 2566 2567static int 2568commctl(com, bits, how) 2569 struct com_s *com; 2570 int bits; 2571 int how; 2572{ 2573 int mcr; 2574 int msr; 2575 2576 if (how == DMGET) { 2577 bits = TIOCM_LE; /* XXX - always enabled while open */ 2578 mcr = com->mcr_image; 2579 if (mcr & MCR_DTR) 2580 bits |= TIOCM_DTR; 2581 if (mcr & MCR_RTS) 2582 bits |= TIOCM_RTS; 2583 msr = com->prev_modem_status; 2584 if (msr & MSR_CTS) 2585 bits |= TIOCM_CTS; 2586 if (msr & MSR_DCD) 2587 bits |= TIOCM_CD; 2588 if (msr & MSR_DSR) 2589 bits |= TIOCM_DSR; 2590 /* 2591 * XXX - MSR_RI is naturally volatile, and we make MSR_TERI 2592 * more volatile by reading the modem status a lot. Perhaps 2593 * we should latch both bits until the status is read here. 2594 */ 2595 if (msr & (MSR_RI | MSR_TERI)) 2596 bits |= TIOCM_RI; 2597 return (bits); 2598 } 2599 mcr = 0; 2600 if (bits & TIOCM_DTR) 2601 mcr |= MCR_DTR; 2602 if (bits & TIOCM_RTS) 2603 mcr |= MCR_RTS; 2604 if (com->gone) 2605 return(0); 2606 mtx_lock_spin(&sio_lock); 2607 switch (how) { 2608 case DMSET: 2609 outb(com->modem_ctl_port, 2610 com->mcr_image = mcr | (com->mcr_image & MCR_IENABLE)); 2611 break; 2612 case DMBIS: 2613 outb(com->modem_ctl_port, com->mcr_image |= mcr); 2614 break; 2615 case DMBIC: 2616 outb(com->modem_ctl_port, com->mcr_image &= ~mcr); 2617 break; 2618 } 2619 mtx_unlock_spin(&sio_lock); 2620 return (0); 2621} 2622 2623static void 2624siosettimeout() 2625{ 2626 struct com_s *com; 2627 bool_t someopen; 2628 int unit; 2629 2630 /* 2631 * Set our timeout period to 1 second if no polled devices are open. 2632 * Otherwise set it to max(1/200, 1/hz). 2633 * Enable timeouts iff some device is open. 2634 */ 2635 untimeout(comwakeup, (void *)NULL, sio_timeout_handle); 2636 sio_timeout = hz; 2637 someopen = FALSE; 2638 for (unit = 0; unit < sio_numunits; ++unit) { 2639 com = com_addr(unit); 2640 if (com != NULL && com->tp != NULL 2641 && com->tp->t_state & TS_ISOPEN && !com->gone) { 2642 someopen = TRUE; 2643 if (com->poll || com->poll_output) { 2644 sio_timeout = hz > 200 ? hz / 200 : 1; 2645 break; 2646 } 2647 } 2648 } 2649 if (someopen) { 2650 sio_timeouts_until_log = hz / sio_timeout; 2651 sio_timeout_handle = timeout(comwakeup, (void *)NULL, 2652 sio_timeout); 2653 } else { 2654 /* Flush error messages, if any. */ 2655 sio_timeouts_until_log = 1; 2656 comwakeup((void *)NULL); 2657 untimeout(comwakeup, (void *)NULL, sio_timeout_handle); 2658 } 2659} 2660 2661static void 2662comwakeup(chan) 2663 void *chan; 2664{ 2665 struct com_s *com; 2666 int unit; 2667 2668 sio_timeout_handle = timeout(comwakeup, (void *)NULL, sio_timeout); 2669 2670 /* 2671 * Recover from lost output interrupts. 2672 * Poll any lines that don't use interrupts. 2673 */ 2674 for (unit = 0; unit < sio_numunits; ++unit) { 2675 com = com_addr(unit); 2676 if (com != NULL && !com->gone 2677 && (com->state >= (CS_BUSY | CS_TTGO) || com->poll)) { 2678 mtx_lock_spin(&sio_lock); 2679 siointr1(com); 2680 mtx_unlock_spin(&sio_lock); 2681 } 2682 } 2683 2684 /* 2685 * Check for and log errors, but not too often. 2686 */ 2687 if (--sio_timeouts_until_log > 0) 2688 return; 2689 sio_timeouts_until_log = hz / sio_timeout; 2690 for (unit = 0; unit < sio_numunits; ++unit) { 2691 int errnum; 2692 2693 com = com_addr(unit); 2694 if (com == NULL) 2695 continue; 2696 if (com->gone) 2697 continue; 2698 for (errnum = 0; errnum < CE_NTYPES; ++errnum) { 2699 u_int delta; 2700 u_long total; 2701 2702 mtx_lock_spin(&sio_lock); 2703 delta = com->delta_error_counts[errnum]; 2704 com->delta_error_counts[errnum] = 0; 2705 mtx_unlock_spin(&sio_lock); 2706 if (delta == 0) 2707 continue; 2708 total = com->error_counts[errnum] += delta; 2709 log(LOG_ERR, "sio%d: %u more %s%s (total %lu)\n", 2710 unit, delta, error_desc[errnum], 2711 delta == 1 ? "" : "s", total); 2712 } 2713 } 2714} 2715 2716static void 2717disc_optim(tp, t, com) 2718 struct tty *tp; 2719 struct termios *t; 2720 struct com_s *com; 2721{ 2722 if (!(t->c_iflag & (ICRNL | IGNCR | IMAXBEL | INLCR | ISTRIP | IXON)) 2723 && (!(t->c_iflag & BRKINT) || (t->c_iflag & IGNBRK)) 2724 && (!(t->c_iflag & PARMRK) 2725 || (t->c_iflag & (IGNPAR | IGNBRK)) == (IGNPAR | IGNBRK)) 2726 && !(t->c_lflag & (ECHO | ICANON | IEXTEN | ISIG | PENDIN)) 2727 && linesw[tp->t_line].l_rint == ttyinput) 2728 tp->t_state |= TS_CAN_BYPASS_L_RINT; 2729 else 2730 tp->t_state &= ~TS_CAN_BYPASS_L_RINT; 2731 com->hotchar = linesw[tp->t_line].l_hotchar; 2732} 2733 2734/* 2735 * Following are all routines needed for SIO to act as console 2736 */ 2737#include <sys/cons.h> 2738 2739struct siocnstate { 2740 u_char dlbl; 2741 u_char dlbh; 2742 u_char ier; 2743 u_char cfcr; 2744 u_char mcr; 2745}; 2746 2747#ifndef __alpha__ 2748static speed_t siocngetspeed(Port_t, u_long rclk); 2749#endif 2750static void siocnclose(struct siocnstate *sp, Port_t iobase); 2751static void siocnopen(struct siocnstate *sp, Port_t iobase, int speed); 2752static void siocntxwait(Port_t iobase); 2753 2754#ifdef __alpha__ 2755int siocnattach(int port, int speed); 2756int siogdbattach(int port, int speed); 2757int siogdbgetc(void); 2758void siogdbputc(int c); 2759#else 2760static cn_probe_t siocnprobe; 2761static cn_init_t siocninit; 2762static cn_term_t siocnterm; 2763#endif 2764static cn_checkc_t siocncheckc; 2765static cn_getc_t siocngetc; 2766static cn_putc_t siocnputc; 2767 2768#ifndef __alpha__ 2769CONS_DRIVER(sio, siocnprobe, siocninit, siocnterm, siocngetc, siocncheckc, 2770 siocnputc, NULL); 2771#endif 2772 2773/* To get the GDB related variables */ 2774#if DDB > 0 2775#include <ddb/ddb.h> 2776static struct consdev gdbconsdev; 2777 2778#endif 2779 2780static void 2781siocntxwait(iobase) 2782 Port_t iobase; 2783{ 2784 int timo; 2785 2786 /* 2787 * Wait for any pending transmission to finish. Required to avoid 2788 * the UART lockup bug when the speed is changed, and for normal 2789 * transmits. 2790 */ 2791 timo = 100000; 2792 while ((inb(iobase + com_lsr) & (LSR_TSRE | LSR_TXRDY)) 2793 != (LSR_TSRE | LSR_TXRDY) && --timo != 0) 2794 ; 2795} 2796 2797#ifndef __alpha__ 2798 2799/* 2800 * Read the serial port specified and try to figure out what speed 2801 * it's currently running at. We're assuming the serial port has 2802 * been initialized and is basicly idle. This routine is only intended 2803 * to be run at system startup. 2804 * 2805 * If the value read from the serial port doesn't make sense, return 0. 2806 */ 2807 2808static speed_t 2809siocngetspeed(iobase, rclk) 2810 Port_t iobase; 2811 u_long rclk; 2812{ 2813 u_int divisor; 2814 u_char dlbh; 2815 u_char dlbl; 2816 u_char cfcr; 2817 2818 cfcr = inb(iobase + com_cfcr); 2819 outb(iobase + com_cfcr, CFCR_DLAB | cfcr); 2820 2821 dlbl = inb(iobase + com_dlbl); 2822 dlbh = inb(iobase + com_dlbh); 2823 2824 outb(iobase + com_cfcr, cfcr); 2825 2826 divisor = dlbh << 8 | dlbl; 2827 2828 /* XXX there should be more sanity checking. */ 2829 if (divisor == 0) 2830 return (CONSPEED); 2831 return (rclk / (16UL * divisor)); 2832} 2833 2834#endif 2835 2836static void 2837siocnopen(sp, iobase, speed) 2838 struct siocnstate *sp; 2839 Port_t iobase; 2840 int speed; 2841{ 2842 u_int divisor; 2843 u_char dlbh; 2844 u_char dlbl; 2845 2846 /* 2847 * Save all the device control registers except the fifo register 2848 * and set our default ones (cs8 -parenb speed=comdefaultrate). 2849 * We can't save the fifo register since it is read-only. 2850 */ 2851 sp->ier = inb(iobase + com_ier); 2852 outb(iobase + com_ier, 0); /* spltty() doesn't stop siointr() */ 2853 siocntxwait(iobase); 2854 sp->cfcr = inb(iobase + com_cfcr); 2855 outb(iobase + com_cfcr, CFCR_DLAB | CFCR_8BITS); 2856 sp->dlbl = inb(iobase + com_dlbl); 2857 sp->dlbh = inb(iobase + com_dlbh); 2858 /* 2859 * Only set the divisor registers if they would change, since on 2860 * some 16550 incompatibles (Startech), setting them clears the 2861 * data input register. This also reduces the effects of the 2862 * UMC8669F bug. 2863 */ 2864 divisor = siodivisor(comdefaultrclk, speed); 2865 dlbl = divisor & 0xFF; 2866 if (sp->dlbl != dlbl) 2867 outb(iobase + com_dlbl, dlbl); 2868 dlbh = divisor >> 8; 2869 if (sp->dlbh != dlbh) 2870 outb(iobase + com_dlbh, dlbh); 2871 outb(iobase + com_cfcr, CFCR_8BITS); 2872 sp->mcr = inb(iobase + com_mcr); 2873 /* 2874 * We don't want interrupts, but must be careful not to "disable" 2875 * them by clearing the MCR_IENABLE bit, since that might cause 2876 * an interrupt by floating the IRQ line. 2877 */ 2878 outb(iobase + com_mcr, (sp->mcr & MCR_IENABLE) | MCR_DTR | MCR_RTS); 2879} 2880 2881static void 2882siocnclose(sp, iobase) 2883 struct siocnstate *sp; 2884 Port_t iobase; 2885{ 2886 /* 2887 * Restore the device control registers. 2888 */ 2889 siocntxwait(iobase); 2890 outb(iobase + com_cfcr, CFCR_DLAB | CFCR_8BITS); 2891 if (sp->dlbl != inb(iobase + com_dlbl)) 2892 outb(iobase + com_dlbl, sp->dlbl); 2893 if (sp->dlbh != inb(iobase + com_dlbh)) 2894 outb(iobase + com_dlbh, sp->dlbh); 2895 outb(iobase + com_cfcr, sp->cfcr); 2896 /* 2897 * XXX damp oscillations of MCR_DTR and MCR_RTS by not restoring them. 2898 */ 2899 outb(iobase + com_mcr, sp->mcr | MCR_DTR | MCR_RTS); 2900 outb(iobase + com_ier, sp->ier); 2901} 2902 2903#ifndef __alpha__ 2904 2905static void 2906siocnprobe(cp) 2907 struct consdev *cp; 2908{ 2909 speed_t boot_speed; 2910 u_char cfcr; 2911 u_int divisor; 2912 int s, unit; 2913 struct siocnstate sp; 2914 2915 /* 2916 * Find our first enabled console, if any. If it is a high-level 2917 * console device, then initialize it and return successfully. 2918 * If it is a low-level console device, then initialize it and 2919 * return unsuccessfully. It must be initialized in both cases 2920 * for early use by console drivers and debuggers. Initializing 2921 * the hardware is not necessary in all cases, since the i/o 2922 * routines initialize it on the fly, but it is necessary if 2923 * input might arrive while the hardware is switched back to an 2924 * uninitialized state. We can't handle multiple console devices 2925 * yet because our low-level routines don't take a device arg. 2926 * We trust the user to set the console flags properly so that we 2927 * don't need to probe. 2928 */ 2929 cp->cn_pri = CN_DEAD; 2930 2931 for (unit = 0; unit < 16; unit++) { /* XXX need to know how many */ 2932 int flags; 2933 int disabled; 2934 if (resource_int_value("sio", unit, "disabled", &disabled) == 0) { 2935 if (disabled) 2936 continue; 2937 } 2938 if (resource_int_value("sio", unit, "flags", &flags)) 2939 continue; 2940 if (COM_CONSOLE(flags) || COM_DEBUGGER(flags)) { 2941 int port; 2942 Port_t iobase; 2943 2944 if (resource_int_value("sio", unit, "port", &port)) 2945 continue; 2946 iobase = port; 2947 s = spltty(); 2948 if (boothowto & RB_SERIAL) { 2949 boot_speed = 2950 siocngetspeed(iobase, comdefaultrclk); 2951 if (boot_speed) 2952 comdefaultrate = boot_speed; 2953 } 2954 2955 /* 2956 * Initialize the divisor latch. We can't rely on 2957 * siocnopen() to do this the first time, since it 2958 * avoids writing to the latch if the latch appears 2959 * to have the correct value. Also, if we didn't 2960 * just read the speed from the hardware, then we 2961 * need to set the speed in hardware so that 2962 * switching it later is null. 2963 */ 2964 cfcr = inb(iobase + com_cfcr); 2965 outb(iobase + com_cfcr, CFCR_DLAB | cfcr); 2966 divisor = siodivisor(comdefaultrclk, comdefaultrate); 2967 outb(iobase + com_dlbl, divisor & 0xff); 2968 outb(iobase + com_dlbh, divisor >> 8); 2969 outb(iobase + com_cfcr, cfcr); 2970 2971 siocnopen(&sp, iobase, comdefaultrate); 2972 2973 splx(s); 2974 if (COM_CONSOLE(flags) && !COM_LLCONSOLE(flags)) { 2975 cp->cn_dev = makedev(CDEV_MAJOR, unit); 2976 cp->cn_pri = COM_FORCECONSOLE(flags) 2977 || boothowto & RB_SERIAL 2978 ? CN_REMOTE : CN_NORMAL; 2979 siocniobase = iobase; 2980 siocnunit = unit; 2981 } 2982 if (COM_DEBUGGER(flags)) { 2983 printf("sio%d: gdb debugging port\n", unit); 2984 siogdbiobase = iobase; 2985 siogdbunit = unit; 2986#if DDB > 0 2987 gdbconsdev.cn_dev = makedev(CDEV_MAJOR, unit); 2988 gdb_arg = &gdbconsdev; 2989 gdb_getc = siocngetc; 2990 gdb_putc = siocnputc; 2991#endif 2992 } 2993 } 2994 } 2995#ifdef __i386__ 2996#if DDB > 0 2997 /* 2998 * XXX Ugly Compatability. 2999 * If no gdb port has been specified, set it to be the console 3000 * as some configuration files don't specify the gdb port. 3001 */ 3002 if (gdb_arg == NULL && (boothowto & RB_GDB)) { 3003 printf("Warning: no GDB port specified. Defaulting to sio%d.\n", 3004 siocnunit); 3005 printf("Set flag 0x80 on desired GDB port in your\n"); 3006 printf("configuration file (currently sio only).\n"); 3007 siogdbiobase = siocniobase; 3008 siogdbunit = siocnunit; 3009 gdbconsdev.cn_dev = makedev(CDEV_MAJOR, siocnunit); 3010 gdb_arg = &gdbconsdev; 3011 gdb_getc = siocngetc; 3012 gdb_putc = siocnputc; 3013 } 3014#endif 3015#endif 3016} 3017 3018static void 3019siocninit(cp) 3020 struct consdev *cp; 3021{ 3022 comconsole = DEV_TO_UNIT(cp->cn_dev); 3023} 3024 3025static void 3026siocnterm(cp) 3027 struct consdev *cp; 3028{ 3029 comconsole = -1; 3030} 3031 3032#endif 3033 3034#ifdef __alpha__ 3035 3036CONS_DRIVER(sio, NULL, NULL, NULL, siocngetc, siocncheckc, siocnputc, NULL); 3037 3038int 3039siocnattach(port, speed) 3040 int port; 3041 int speed; 3042{ 3043 int s; 3044 u_char cfcr; 3045 u_int divisor; 3046 struct siocnstate sp; 3047 int unit = 0; /* XXX random value! */ 3048 3049 siocniobase = port; 3050 siocnunit = unit; 3051 comdefaultrate = speed; 3052 sio_consdev.cn_pri = CN_NORMAL; 3053 sio_consdev.cn_dev = makedev(CDEV_MAJOR, unit); 3054 3055 s = spltty(); 3056 3057 /* 3058 * Initialize the divisor latch. We can't rely on 3059 * siocnopen() to do this the first time, since it 3060 * avoids writing to the latch if the latch appears 3061 * to have the correct value. Also, if we didn't 3062 * just read the speed from the hardware, then we 3063 * need to set the speed in hardware so that 3064 * switching it later is null. 3065 */ 3066 cfcr = inb(siocniobase + com_cfcr); 3067 outb(siocniobase + com_cfcr, CFCR_DLAB | cfcr); 3068 divisor = siodivisor(comdefaultrclk, comdefaultrate); 3069 outb(siocniobase + com_dlbl, divisor & 0xff); 3070 outb(siocniobase + com_dlbh, divisor >> 8); 3071 outb(siocniobase + com_cfcr, cfcr); 3072 3073 siocnopen(&sp, siocniobase, comdefaultrate); 3074 splx(s); 3075 3076 cnadd(&sio_consdev); 3077 return (0); 3078} 3079 3080int 3081siogdbattach(port, speed) 3082 int port; 3083 int speed; 3084{ 3085 int s; 3086 u_char cfcr; 3087 u_int divisor; 3088 struct siocnstate sp; 3089 int unit = 1; /* XXX random value! */ 3090 3091 siogdbiobase = port; 3092 gdbdefaultrate = speed; 3093 3094 printf("sio%d: gdb debugging port\n", unit); 3095 siogdbunit = unit; 3096#if DDB > 0 3097 gdbconsdev.cn_dev = makedev(CDEV_MAJOR, unit); 3098 gdb_arg = &gdbconsdev; 3099 gdb_getc = siocngetc; 3100 gdb_putc = siocnputc; 3101#endif 3102 3103 s = spltty(); 3104 3105 /* 3106 * Initialize the divisor latch. We can't rely on 3107 * siocnopen() to do this the first time, since it 3108 * avoids writing to the latch if the latch appears 3109 * to have the correct value. Also, if we didn't 3110 * just read the speed from the hardware, then we 3111 * need to set the speed in hardware so that 3112 * switching it later is null. 3113 */ 3114 cfcr = inb(siogdbiobase + com_cfcr); 3115 outb(siogdbiobase + com_cfcr, CFCR_DLAB | cfcr); 3116 divisor = siodivisor(comdefaultrclk, gdbdefaultrate); 3117 outb(siogdbiobase + com_dlbl, divisor & 0xff); 3118 outb(siogdbiobase + com_dlbh, divisor >> 8); 3119 outb(siogdbiobase + com_cfcr, cfcr); 3120 3121 siocnopen(&sp, siogdbiobase, gdbdefaultrate); 3122 splx(s); 3123 3124 return (0); 3125} 3126 3127#endif 3128 3129static int 3130siocncheckc(struct consdev *cd) 3131{ 3132 int c; 3133 dev_t dev; 3134 Port_t iobase; 3135 int s; 3136 struct siocnstate sp; 3137 speed_t speed; 3138 3139 dev = cd->cn_dev; 3140 if (minor(dev) == siocnunit) { 3141 iobase = siocniobase; 3142 speed = comdefaultrate; 3143 } else { 3144 iobase = siogdbiobase; 3145 speed = gdbdefaultrate; 3146 } 3147 s = spltty(); 3148 siocnopen(&sp, iobase, speed); 3149 if (inb(iobase + com_lsr) & LSR_RXRDY) 3150 c = inb(iobase + com_data); 3151 else 3152 c = -1; 3153 siocnclose(&sp, iobase); 3154 splx(s); 3155 return (c); 3156} 3157 3158 3159static int 3160siocngetc(struct consdev *cd) 3161{ 3162 int c; 3163 dev_t dev; 3164 Port_t iobase; 3165 int s; 3166 struct siocnstate sp; 3167 speed_t speed; 3168 3169 dev = cd->cn_dev; 3170 if (minor(dev) == siocnunit) { 3171 iobase = siocniobase; 3172 speed = comdefaultrate; 3173 } else { 3174 iobase = siogdbiobase; 3175 speed = gdbdefaultrate; 3176 } 3177 s = spltty(); 3178 siocnopen(&sp, iobase, speed); 3179 while (!(inb(iobase + com_lsr) & LSR_RXRDY)) 3180 ; 3181 c = inb(iobase + com_data); 3182 siocnclose(&sp, iobase); 3183 splx(s); 3184 return (c); 3185} 3186 3187static void 3188siocnputc(struct consdev *cd, int c) 3189{ 3190 int need_unlock; 3191 int s; 3192 dev_t dev; 3193 struct siocnstate sp; 3194 Port_t iobase; 3195 speed_t speed; 3196 3197 dev = cd->cn_dev; 3198 if (minor(dev) == siocnunit) { 3199 iobase = siocniobase; 3200 speed = comdefaultrate; 3201 } else { 3202 iobase = siogdbiobase; 3203 speed = gdbdefaultrate; 3204 } 3205 s = spltty(); 3206 need_unlock = 0; 3207 if (sio_inited == 2 && !mtx_owned(&sio_lock)) { 3208 mtx_lock_spin(&sio_lock); 3209 need_unlock = 1; 3210 } 3211 siocnopen(&sp, iobase, speed); 3212 siocntxwait(iobase); 3213 outb(iobase + com_data, c); 3214 siocnclose(&sp, iobase); 3215 if (need_unlock) 3216 mtx_unlock_spin(&sio_lock); 3217 splx(s); 3218} 3219 3220#ifdef __alpha__ 3221int 3222siogdbgetc() 3223{ 3224 int c; 3225 Port_t iobase; 3226 speed_t speed; 3227 int s; 3228 struct siocnstate sp; 3229 3230 if (siogdbunit == siocnunit) { 3231 iobase = siocniobase; 3232 speed = comdefaultrate; 3233 } else { 3234 iobase = siogdbiobase; 3235 speed = gdbdefaultrate; 3236 } 3237 3238 s = spltty(); 3239 siocnopen(&sp, iobase, speed); 3240 while (!(inb(iobase + com_lsr) & LSR_RXRDY)) 3241 ; 3242 c = inb(iobase + com_data); 3243 siocnclose(&sp, iobase); 3244 splx(s); 3245 return (c); 3246} 3247 3248void 3249siogdbputc(c) 3250 int c; 3251{ 3252 Port_t iobase; 3253 speed_t speed; 3254 int s; 3255 struct siocnstate sp; 3256 3257 if (siogdbunit == siocnunit) { 3258 iobase = siocniobase; 3259 speed = comdefaultrate; 3260 } else { 3261 iobase = siogdbiobase; 3262 speed = gdbdefaultrate; 3263 } 3264 3265 s = spltty(); 3266 siocnopen(&sp, iobase, speed); 3267 siocntxwait(siogdbiobase); 3268 outb(siogdbiobase + com_data, c); 3269 siocnclose(&sp, siogdbiobase); 3270 splx(s); 3271} 3272#endif 3273