sio.c revision 111821
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 111821 2003-03-03 16:24:47Z 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_PPSCTS(flags) ((flags) & 0x10000) 117#define COM_ST16650A(flags) ((flags) & 0x20000) 118#define COM_C_NOPROBE (0x40000) 119#define COM_NOPROBE(flags) ((flags) & COM_C_NOPROBE) 120#define COM_C_IIR_TXRDYBUG (0x80000) 121#define COM_IIR_TXRDYBUG(flags) ((flags) & COM_C_IIR_TXRDYBUG) 122#define COM_NOSCR(flags) ((flags) & 0x100000) 123#define COM_FIFOSIZE(flags) (((flags) & 0xff000000) >> 24) 124 125#define sio_getreg(com, off) \ 126 (bus_space_read_1((com)->bst, (com)->bsh, (off))) 127#define sio_setreg(com, off, value) \ 128 (bus_space_write_1((com)->bst, (com)->bsh, (off), (value))) 129 130/* 131 * com state bits. 132 * (CS_BUSY | CS_TTGO) and (CS_BUSY | CS_TTGO | CS_ODEVREADY) must be higher 133 * than the other bits so that they can be tested as a group without masking 134 * off the low bits. 135 * 136 * The following com and tty flags correspond closely: 137 * CS_BUSY = TS_BUSY (maintained by comstart(), siopoll() and 138 * comstop()) 139 * CS_TTGO = ~TS_TTSTOP (maintained by comparam() and comstart()) 140 * CS_CTS_OFLOW = CCTS_OFLOW (maintained by comparam()) 141 * CS_RTS_IFLOW = CRTS_IFLOW (maintained by comparam()) 142 * TS_FLUSH is not used. 143 * XXX I think TIOCSETA doesn't clear TS_TTSTOP when it clears IXON. 144 * XXX CS_*FLOW should be CF_*FLOW in com->flags (control flags not state). 145 */ 146#define CS_BUSY 0x80 /* output in progress */ 147#define CS_TTGO 0x40 /* output not stopped by XOFF */ 148#define CS_ODEVREADY 0x20 /* external device h/w ready (CTS) */ 149#define CS_CHECKMSR 1 /* check of MSR scheduled */ 150#define CS_CTS_OFLOW 2 /* use CTS output flow control */ 151#define CS_DTR_OFF 0x10 /* DTR held off */ 152#define CS_ODONE 4 /* output completed */ 153#define CS_RTS_IFLOW 8 /* use RTS input flow control */ 154#define CSE_BUSYCHECK 1 /* siobusycheck() scheduled */ 155 156static char const * const error_desc[] = { 157#define CE_OVERRUN 0 158 "silo overflow", 159#define CE_INTERRUPT_BUF_OVERFLOW 1 160 "interrupt-level buffer overflow", 161#define CE_TTY_BUF_OVERFLOW 2 162 "tty-level buffer overflow", 163}; 164 165#define CE_NTYPES 3 166#define CE_RECORD(com, errnum) (++(com)->delta_error_counts[errnum]) 167 168/* types. XXX - should be elsewhere */ 169typedef u_int Port_t; /* hardware port */ 170typedef u_char bool_t; /* boolean */ 171 172/* queue of linear buffers */ 173struct lbq { 174 u_char *l_head; /* next char to process */ 175 u_char *l_tail; /* one past the last char to process */ 176 struct lbq *l_next; /* next in queue */ 177 bool_t l_queued; /* nonzero if queued */ 178}; 179 180/* com device structure */ 181struct com_s { 182 u_int flags; /* Copy isa device flags */ 183 u_char state; /* miscellaneous flag bits */ 184 bool_t active_out; /* nonzero if the callout device is open */ 185 u_char cfcr_image; /* copy of value written to CFCR */ 186#ifdef COM_ESP 187 bool_t esp; /* is this unit a hayes esp board? */ 188#endif 189 u_char extra_state; /* more flag bits, separate for order trick */ 190 u_char fifo_image; /* copy of value written to FIFO */ 191 bool_t hasfifo; /* nonzero for 16550 UARTs */ 192 bool_t st16650a; /* Is a Startech 16650A or RTS/CTS compat */ 193 bool_t loses_outints; /* nonzero if device loses output interrupts */ 194 u_char mcr_image; /* copy of value written to MCR */ 195#ifdef COM_MULTIPORT 196 bool_t multiport; /* is this unit part of a multiport device? */ 197#endif /* COM_MULTIPORT */ 198 bool_t no_irq; /* nonzero if irq is not attached */ 199 bool_t gone; /* hardware disappeared */ 200 bool_t poll; /* nonzero if polling is required */ 201 bool_t poll_output; /* nonzero if polling for output is required */ 202 int unit; /* unit number */ 203 int dtr_wait; /* time to hold DTR down on close (* 1/hz) */ 204 u_int tx_fifo_size; 205 u_int wopeners; /* # processes waiting for DCD in open() */ 206 207 /* 208 * The high level of the driver never reads status registers directly 209 * because there would be too many side effects to handle conveniently. 210 * Instead, it reads copies of the registers stored here by the 211 * interrupt handler. 212 */ 213 u_char last_modem_status; /* last MSR read by intr handler */ 214 u_char prev_modem_status; /* last MSR handled by high level */ 215 216 u_char hotchar; /* ldisc-specific char to be handled ASAP */ 217 u_char *ibuf; /* start of input buffer */ 218 u_char *ibufend; /* end of input buffer */ 219 u_char *ibufold; /* old input buffer, to be freed */ 220 u_char *ihighwater; /* threshold in input buffer */ 221 u_char *iptr; /* next free spot in input buffer */ 222 int ibufsize; /* size of ibuf (not include error bytes) */ 223 int ierroff; /* offset of error bytes in ibuf */ 224 225 struct lbq obufq; /* head of queue of output buffers */ 226 struct lbq obufs[2]; /* output buffers */ 227 228 bus_space_tag_t bst; 229 bus_space_handle_t bsh; 230 231 Port_t data_port; /* i/o ports */ 232#ifdef COM_ESP 233 Port_t esp_port; 234#endif 235 Port_t int_id_port; 236 Port_t modem_ctl_port; 237 Port_t line_status_port; 238 Port_t modem_status_port; 239 Port_t intr_ctl_port; /* Ports of IIR register */ 240 241 struct tty *tp; /* cross reference */ 242 243 /* Initial state. */ 244 struct termios it_in; /* should be in struct tty */ 245 struct termios it_out; 246 247 /* Lock state. */ 248 struct termios lt_in; /* should be in struct tty */ 249 struct termios lt_out; 250 251 bool_t do_timestamp; 252 bool_t do_dcd_timestamp; 253 struct timeval timestamp; 254 struct timeval dcd_timestamp; 255 struct pps_state pps; 256 int pps_bit; 257 258 u_long bytes_in; /* statistics */ 259 u_long bytes_out; 260 u_int delta_error_counts[CE_NTYPES]; 261 u_long error_counts[CE_NTYPES]; 262 263 u_long rclk; 264 265 struct resource *irqres; 266 struct resource *ioportres; 267 void *cookie; 268 dev_t devs[6]; 269 270 /* 271 * Data area for output buffers. Someday we should build the output 272 * buffer queue without copying data. 273 */ 274 u_char obuf1[256]; 275 u_char obuf2[256]; 276}; 277 278#ifdef COM_ESP 279static int espattach(struct com_s *com, Port_t esp_port); 280#endif 281 282static timeout_t siobusycheck; 283static u_int siodivisor(u_long rclk, speed_t speed); 284static timeout_t siodtrwakeup; 285static void comhardclose(struct com_s *com); 286static void sioinput(struct com_s *com); 287static void siointr1(struct com_s *com); 288static void siointr(void *arg); 289static int commctl(struct com_s *com, int bits, int how); 290static int comparam(struct tty *tp, struct termios *t); 291static void siopoll(void *); 292static void siosettimeout(void); 293static int siosetwater(struct com_s *com, speed_t speed); 294static void comstart(struct tty *tp); 295static void comstop(struct tty *tp, int rw); 296static timeout_t comwakeup; 297static void disc_optim(struct tty *tp, struct termios *t, 298 struct com_s *com); 299 300char sio_driver_name[] = "sio"; 301static struct mtx sio_lock; 302static int sio_inited; 303 304/* table and macro for fast conversion from a unit number to its com struct */ 305devclass_t sio_devclass; 306#define com_addr(unit) ((struct com_s *) \ 307 devclass_get_softc(sio_devclass, unit)) /* XXX */ 308 309static d_open_t sioopen; 310static d_close_t sioclose; 311static d_read_t sioread; 312static d_write_t siowrite; 313static d_ioctl_t sioioctl; 314 315#define CDEV_MAJOR 28 316static struct cdevsw sio_cdevsw = { 317 .d_open = sioopen, 318 .d_close = sioclose, 319 .d_read = sioread, 320 .d_write = siowrite, 321 .d_ioctl = sioioctl, 322 .d_poll = ttypoll, 323 .d_name = sio_driver_name, 324 .d_maj = CDEV_MAJOR, 325 .d_flags = D_TTY, 326 .d_kqfilter = ttykqfilter, 327}; 328 329int comconsole = -1; 330static volatile speed_t comdefaultrate = CONSPEED; 331static u_long comdefaultrclk = DEFAULT_RCLK; 332SYSCTL_ULONG(_machdep, OID_AUTO, conrclk, CTLFLAG_RW, &comdefaultrclk, 0, ""); 333static speed_t gdbdefaultrate = GDBSPEED; 334SYSCTL_UINT(_machdep, OID_AUTO, gdbspeed, CTLFLAG_RW, 335 &gdbdefaultrate, GDBSPEED, ""); 336static u_int com_events; /* input chars + weighted output completions */ 337static Port_t siocniobase; 338static int siocnunit = -1; 339static Port_t siogdbiobase; 340static int siogdbunit = -1; 341static void *sio_slow_ih; 342static void *sio_fast_ih; 343static int sio_timeout; 344static int sio_timeouts_until_log; 345static struct callout_handle sio_timeout_handle 346 = CALLOUT_HANDLE_INITIALIZER(&sio_timeout_handle); 347static int sio_numunits; 348 349#ifdef COM_ESP 350/* XXX configure this properly. */ 351/* XXX quite broken for new-bus. */ 352static Port_t likely_com_ports[] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8, }; 353static Port_t likely_esp_ports[] = { 0x140, 0x180, 0x280, 0 }; 354#endif 355 356/* 357 * handle sysctl read/write requests for console speed 358 * 359 * In addition to setting comdefaultrate for I/O through /dev/console, 360 * also set the initial and lock values for the /dev/ttyXX device 361 * if there is one associated with the console. Finally, if the /dev/tty 362 * device has already been open, change the speed on the open running port 363 * itself. 364 */ 365 366static int 367sysctl_machdep_comdefaultrate(SYSCTL_HANDLER_ARGS) 368{ 369 int error, s; 370 speed_t newspeed; 371 struct com_s *com; 372 struct tty *tp; 373 374 newspeed = comdefaultrate; 375 376 error = sysctl_handle_opaque(oidp, &newspeed, sizeof newspeed, req); 377 if (error || !req->newptr) 378 return (error); 379 380 comdefaultrate = newspeed; 381 382 if (comconsole < 0) /* serial console not selected? */ 383 return (0); 384 385 com = com_addr(comconsole); 386 if (com == NULL) 387 return (ENXIO); 388 389 /* 390 * set the initial and lock rates for /dev/ttydXX and /dev/cuaXX 391 * (note, the lock rates really are boolean -- if non-zero, disallow 392 * speed changes) 393 */ 394 com->it_in.c_ispeed = com->it_in.c_ospeed = 395 com->lt_in.c_ispeed = com->lt_in.c_ospeed = 396 com->it_out.c_ispeed = com->it_out.c_ospeed = 397 com->lt_out.c_ispeed = com->lt_out.c_ospeed = comdefaultrate; 398 399 /* 400 * if we're open, change the running rate too 401 */ 402 tp = com->tp; 403 if (tp && (tp->t_state & TS_ISOPEN)) { 404 tp->t_termios.c_ispeed = 405 tp->t_termios.c_ospeed = comdefaultrate; 406 s = spltty(); 407 error = comparam(tp, &tp->t_termios); 408 splx(s); 409 } 410 return error; 411} 412 413SYSCTL_PROC(_machdep, OID_AUTO, conspeed, CTLTYPE_INT | CTLFLAG_RW, 414 0, 0, sysctl_machdep_comdefaultrate, "I", ""); 415/* TUNABLE_INT("machdep.conspeed", &comdefaultrate); */ 416 417#define SET_FLAG(dev, bit) device_set_flags(dev, device_get_flags(dev) | (bit)) 418#define CLR_FLAG(dev, bit) device_set_flags(dev, device_get_flags(dev) & ~(bit)) 419 420/* 421 * Unload the driver and clear the table. 422 * XXX this is mostly wrong. 423 * XXX TODO: 424 * This is usually called when the card is ejected, but 425 * can be caused by a kldunload of a controller driver. 426 * The idea is to reset the driver's view of the device 427 * and ensure that any driver entry points such as 428 * read and write do not hang. 429 */ 430int 431siodetach(dev) 432 device_t dev; 433{ 434 struct com_s *com; 435 int i; 436 437 com = (struct com_s *) device_get_softc(dev); 438 if (com == NULL) { 439 device_printf(dev, "NULL com in siounload\n"); 440 return (0); 441 } 442 com->gone = 1; 443 for (i = 0 ; i < 6; i++) 444 destroy_dev(com->devs[i]); 445 if (com->irqres) { 446 bus_teardown_intr(dev, com->irqres, com->cookie); 447 bus_release_resource(dev, SYS_RES_IRQ, 0, com->irqres); 448 } 449 if (com->ioportres) 450 bus_release_resource(dev, SYS_RES_IOPORT, 0, com->ioportres); 451 if (com->tp && (com->tp->t_state & TS_ISOPEN)) { 452 device_printf(dev, "still open, forcing close\n"); 453 (*linesw[com->tp->t_line].l_close)(com->tp, 0); 454 com->tp->t_gen++; 455 ttyclose(com->tp); 456 ttwakeup(com->tp); 457 ttwwakeup(com->tp); 458 } else { 459 if (com->ibuf != NULL) 460 free(com->ibuf, M_DEVBUF); 461 device_set_softc(dev, NULL); 462 free(com, M_DEVBUF); 463 } 464 return (0); 465} 466 467int 468sioprobe(dev, xrid, rclk, noprobe) 469 device_t dev; 470 int xrid; 471 u_long rclk; 472 int noprobe; 473{ 474#if 0 475 static bool_t already_init; 476 device_t xdev; 477#endif 478 struct com_s *com; 479 u_int divisor; 480 bool_t failures[10]; 481 int fn; 482 device_t idev; 483 Port_t iobase; 484 intrmask_t irqmap[4]; 485 intrmask_t irqs; 486 u_char mcr_image; 487 int result; 488 u_long xirq; 489 u_int flags = device_get_flags(dev); 490 int rid; 491 struct resource *port; 492 493 rid = xrid; 494 port = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid, 495 0, ~0, IO_COMSIZE, RF_ACTIVE); 496 if (!port) 497 return (ENXIO); 498 499 com = malloc(sizeof(*com), M_DEVBUF, M_NOWAIT | M_ZERO); 500 if (com == NULL) 501 return (ENOMEM); 502 device_set_softc(dev, com); 503 com->bst = rman_get_bustag(port); 504 com->bsh = rman_get_bushandle(port); 505 if (rclk == 0) 506 rclk = DEFAULT_RCLK; 507 com->rclk = rclk; 508 509 while (sio_inited != 2) 510 if (atomic_cmpset_int(&sio_inited, 0, 1)) { 511 mtx_init(&sio_lock, sio_driver_name, NULL, 512 (comconsole != -1) ? 513 MTX_SPIN | MTX_QUIET : MTX_SPIN); 514 atomic_store_rel_int(&sio_inited, 2); 515 } 516 517#if 0 518 /* 519 * XXX this is broken - when we are first called, there are no 520 * previously configured IO ports. We could hard code 521 * 0x3f8, 0x2f8, 0x3e8, 0x2e8 etc but that's probably worse. 522 * This code has been doing nothing since the conversion since 523 * "count" is zero the first time around. 524 */ 525 if (!already_init) { 526 /* 527 * Turn off MCR_IENABLE for all likely serial ports. An unused 528 * port with its MCR_IENABLE gate open will inhibit interrupts 529 * from any used port that shares the interrupt vector. 530 * XXX the gate enable is elsewhere for some multiports. 531 */ 532 device_t *devs; 533 int count, i, xioport; 534 535 devclass_get_devices(sio_devclass, &devs, &count); 536 for (i = 0; i < count; i++) { 537 xdev = devs[i]; 538 if (device_is_enabled(xdev) && 539 bus_get_resource(xdev, SYS_RES_IOPORT, 0, &xioport, 540 NULL) == 0) 541 outb(xioport + com_mcr, 0); 542 } 543 free(devs, M_TEMP); 544 already_init = TRUE; 545 } 546#endif 547 548 if (COM_LLCONSOLE(flags)) { 549 printf("sio%d: reserved for low-level i/o\n", 550 device_get_unit(dev)); 551 bus_release_resource(dev, SYS_RES_IOPORT, rid, port); 552 device_set_softc(dev, NULL); 553 free(com, M_DEVBUF); 554 return (ENXIO); 555 } 556 557 /* 558 * If the device is on a multiport card and has an AST/4 559 * compatible interrupt control register, initialize this 560 * register and prepare to leave MCR_IENABLE clear in the mcr. 561 * Otherwise, prepare to set MCR_IENABLE in the mcr. 562 * Point idev to the device struct giving the correct id_irq. 563 * This is the struct for the master device if there is one. 564 */ 565 idev = dev; 566 mcr_image = MCR_IENABLE; 567#ifdef COM_MULTIPORT 568 if (COM_ISMULTIPORT(flags)) { 569 Port_t xiobase; 570 u_long io; 571 572 idev = devclass_get_device(sio_devclass, COM_MPMASTER(flags)); 573 if (idev == NULL) { 574 printf("sio%d: master device %d not configured\n", 575 device_get_unit(dev), COM_MPMASTER(flags)); 576 idev = dev; 577 } 578 if (!COM_NOTAST4(flags)) { 579 if (bus_get_resource(idev, SYS_RES_IOPORT, 0, &io, 580 NULL) == 0) { 581 xiobase = io; 582 if (bus_get_resource(idev, SYS_RES_IRQ, 0, 583 NULL, NULL) == 0) 584 outb(xiobase + com_scr, 0x80); 585 else 586 outb(xiobase + com_scr, 0); 587 } 588 mcr_image = 0; 589 } 590 } 591#endif /* COM_MULTIPORT */ 592 if (bus_get_resource(idev, SYS_RES_IRQ, 0, NULL, NULL) != 0) 593 mcr_image = 0; 594 595 bzero(failures, sizeof failures); 596 iobase = rman_get_start(port); 597 598 /* 599 * We don't want to get actual interrupts, just masked ones. 600 * Interrupts from this line should already be masked in the ICU, 601 * but mask them in the processor as well in case there are some 602 * (misconfigured) shared interrupts. 603 */ 604 mtx_lock_spin(&sio_lock); 605/* EXTRA DELAY? */ 606 607 /* 608 * Initialize the speed and the word size and wait long enough to 609 * drain the maximum of 16 bytes of junk in device output queues. 610 * The speed is undefined after a master reset and must be set 611 * before relying on anything related to output. There may be 612 * junk after a (very fast) soft reboot and (apparently) after 613 * master reset. 614 * XXX what about the UART bug avoided by waiting in comparam()? 615 * We don't want to to wait long enough to drain at 2 bps. 616 */ 617 if (iobase == siocniobase) 618 DELAY((16 + 1) * 1000000 / (comdefaultrate / 10)); 619 else { 620 sio_setreg(com, com_cfcr, CFCR_DLAB | CFCR_8BITS); 621 divisor = siodivisor(rclk, SIO_TEST_SPEED); 622 sio_setreg(com, com_dlbl, divisor & 0xff); 623 sio_setreg(com, com_dlbh, divisor >> 8); 624 sio_setreg(com, com_cfcr, CFCR_8BITS); 625 DELAY((16 + 1) * 1000000 / (SIO_TEST_SPEED / 10)); 626 } 627 628 /* 629 * Enable the interrupt gate and disable device interupts. This 630 * should leave the device driving the interrupt line low and 631 * guarantee an edge trigger if an interrupt can be generated. 632 */ 633/* EXTRA DELAY? */ 634 sio_setreg(com, com_mcr, mcr_image); 635 sio_setreg(com, com_ier, 0); 636 DELAY(1000); /* XXX */ 637 irqmap[0] = isa_irq_pending(); 638 639 /* 640 * Attempt to set loopback mode so that we can send a null byte 641 * without annoying any external device. 642 */ 643/* EXTRA DELAY? */ 644 sio_setreg(com, com_mcr, mcr_image | MCR_LOOPBACK); 645 646 /* 647 * Attempt to generate an output interrupt. On 8250's, setting 648 * IER_ETXRDY generates an interrupt independent of the current 649 * setting and independent of whether the THR is empty. On 16450's, 650 * setting IER_ETXRDY generates an interrupt independent of the 651 * current setting. On 16550A's, setting IER_ETXRDY only 652 * generates an interrupt when IER_ETXRDY is not already set. 653 */ 654 sio_setreg(com, com_ier, IER_ETXRDY); 655 656 /* 657 * On some 16x50 incompatibles, setting IER_ETXRDY doesn't generate 658 * an interrupt. They'd better generate one for actually doing 659 * output. Loopback may be broken on the same incompatibles but 660 * it's unlikely to do more than allow the null byte out. 661 */ 662 sio_setreg(com, com_data, 0); 663 DELAY((1 + 2) * 1000000 / (SIO_TEST_SPEED / 10)); 664 665 /* 666 * Turn off loopback mode so that the interrupt gate works again 667 * (MCR_IENABLE was hidden). This should leave the device driving 668 * an interrupt line high. It doesn't matter if the interrupt 669 * line oscillates while we are not looking at it, since interrupts 670 * are disabled. 671 */ 672/* EXTRA DELAY? */ 673 sio_setreg(com, com_mcr, mcr_image); 674 675 /* 676 * It seems my Xircom CBEM56G Cardbus modem wants to be reset 677 * to 8 bits *again*, or else probe test 0 will fail. 678 * gwk@sgi.com, 4/19/2001 679 */ 680 sio_setreg(com, com_cfcr, CFCR_8BITS); 681 682 /* 683 * Some pcmcia cards have the "TXRDY bug", so we check everyone 684 * for IIR_TXRDY implementation ( Palido 321s, DC-1S... ) 685 */ 686 if (noprobe) { 687 /* Reading IIR register twice */ 688 for (fn = 0; fn < 2; fn ++) { 689 DELAY(10000); 690 failures[6] = sio_getreg(com, com_iir); 691 } 692 /* Check IIR_TXRDY clear ? */ 693 result = 0; 694 if (failures[6] & IIR_TXRDY) { 695 /* No, Double check with clearing IER */ 696 sio_setreg(com, com_ier, 0); 697 if (sio_getreg(com, com_iir) & IIR_NOPEND) { 698 /* Ok. We discovered TXRDY bug! */ 699 SET_FLAG(dev, COM_C_IIR_TXRDYBUG); 700 } else { 701 /* Unknown, Just omit this chip.. XXX */ 702 result = ENXIO; 703 sio_setreg(com, com_mcr, 0); 704 } 705 } else { 706 /* OK. this is well-known guys */ 707 CLR_FLAG(dev, COM_C_IIR_TXRDYBUG); 708 } 709 sio_setreg(com, com_ier, 0); 710 sio_setreg(com, com_cfcr, CFCR_8BITS); 711 mtx_unlock_spin(&sio_lock); 712 bus_release_resource(dev, SYS_RES_IOPORT, rid, port); 713 if (iobase == siocniobase) 714 result = 0; 715 if (result != 0) { 716 device_set_softc(dev, NULL); 717 free(com, M_DEVBUF); 718 } 719 return (result); 720 } 721 722 /* 723 * Check that 724 * o the CFCR, IER and MCR in UART hold the values written to them 725 * (the values happen to be all distinct - this is good for 726 * avoiding false positive tests from bus echoes). 727 * o an output interrupt is generated and its vector is correct. 728 * o the interrupt goes away when the IIR in the UART is read. 729 */ 730/* EXTRA DELAY? */ 731 failures[0] = sio_getreg(com, com_cfcr) - CFCR_8BITS; 732 failures[1] = sio_getreg(com, com_ier) - IER_ETXRDY; 733 failures[2] = sio_getreg(com, com_mcr) - mcr_image; 734 DELAY(10000); /* Some internal modems need this time */ 735 irqmap[1] = isa_irq_pending(); 736 failures[4] = (sio_getreg(com, com_iir) & IIR_IMASK) - IIR_TXRDY; 737 DELAY(1000); /* XXX */ 738 irqmap[2] = isa_irq_pending(); 739 failures[6] = (sio_getreg(com, com_iir) & IIR_IMASK) - IIR_NOPEND; 740 741 /* 742 * Turn off all device interrupts and check that they go off properly. 743 * Leave MCR_IENABLE alone. For ports without a master port, it gates 744 * the OUT2 output of the UART to 745 * the ICU input. Closing the gate would give a floating ICU input 746 * (unless there is another device driving it) and spurious interrupts. 747 * (On the system that this was first tested on, the input floats high 748 * and gives a (masked) interrupt as soon as the gate is closed.) 749 */ 750 sio_setreg(com, com_ier, 0); 751 sio_setreg(com, com_cfcr, CFCR_8BITS); /* dummy to avoid bus echo */ 752 failures[7] = sio_getreg(com, com_ier); 753 DELAY(1000); /* XXX */ 754 irqmap[3] = isa_irq_pending(); 755 failures[9] = (sio_getreg(com, com_iir) & IIR_IMASK) - IIR_NOPEND; 756 757 mtx_unlock_spin(&sio_lock); 758 759 irqs = irqmap[1] & ~irqmap[0]; 760 if (bus_get_resource(idev, SYS_RES_IRQ, 0, &xirq, NULL) == 0 && 761 ((1 << xirq) & irqs) == 0) { 762 printf( 763 "sio%d: configured irq %ld not in bitmap of probed irqs %#x\n", 764 device_get_unit(dev), xirq, irqs); 765 printf( 766 "sio%d: port may not be enabled\n", 767 device_get_unit(dev)); 768 } 769 if (bootverbose) 770 printf("sio%d: irq maps: %#x %#x %#x %#x\n", 771 device_get_unit(dev), 772 irqmap[0], irqmap[1], irqmap[2], irqmap[3]); 773 774 result = 0; 775 for (fn = 0; fn < sizeof failures; ++fn) 776 if (failures[fn]) { 777 sio_setreg(com, com_mcr, 0); 778 result = ENXIO; 779 if (bootverbose) { 780 printf("sio%d: probe failed test(s):", 781 device_get_unit(dev)); 782 for (fn = 0; fn < sizeof failures; ++fn) 783 if (failures[fn]) 784 printf(" %d", fn); 785 printf("\n"); 786 } 787 break; 788 } 789 bus_release_resource(dev, SYS_RES_IOPORT, rid, port); 790 if (iobase == siocniobase) 791 result = 0; 792 if (result != 0) { 793 device_set_softc(dev, NULL); 794 free(com, M_DEVBUF); 795 } 796 return (result); 797} 798 799#ifdef COM_ESP 800static int 801espattach(com, esp_port) 802 struct com_s *com; 803 Port_t esp_port; 804{ 805 u_char dips; 806 u_char val; 807 808 /* 809 * Check the ESP-specific I/O port to see if we're an ESP 810 * card. If not, return failure immediately. 811 */ 812 if ((inb(esp_port) & 0xf3) == 0) { 813 printf(" port 0x%x is not an ESP board?\n", esp_port); 814 return (0); 815 } 816 817 /* 818 * We've got something that claims to be a Hayes ESP card. 819 * Let's hope so. 820 */ 821 822 /* Get the dip-switch configuration */ 823 outb(esp_port + ESP_CMD1, ESP_GETDIPS); 824 dips = inb(esp_port + ESP_STATUS1); 825 826 /* 827 * Bits 0,1 of dips say which COM port we are. 828 */ 829 if (rman_get_start(com->ioportres) == likely_com_ports[dips & 0x03]) 830 printf(" : ESP"); 831 else { 832 printf(" esp_port has com %d\n", dips & 0x03); 833 return (0); 834 } 835 836 /* 837 * Check for ESP version 2.0 or later: bits 4,5,6 = 010. 838 */ 839 outb(esp_port + ESP_CMD1, ESP_GETTEST); 840 val = inb(esp_port + ESP_STATUS1); /* clear reg 1 */ 841 val = inb(esp_port + ESP_STATUS2); 842 if ((val & 0x70) < 0x20) { 843 printf("-old (%o)", val & 0x70); 844 return (0); 845 } 846 847 /* 848 * Check for ability to emulate 16550: bit 7 == 1 849 */ 850 if ((dips & 0x80) == 0) { 851 printf(" slave"); 852 return (0); 853 } 854 855 /* 856 * Okay, we seem to be a Hayes ESP card. Whee. 857 */ 858 com->esp = TRUE; 859 com->esp_port = esp_port; 860 return (1); 861} 862#endif /* COM_ESP */ 863 864int 865sioattach(dev, xrid, rclk) 866 device_t dev; 867 int xrid; 868 u_long rclk; 869{ 870 struct com_s *com; 871#ifdef COM_ESP 872 Port_t *espp; 873#endif 874 Port_t iobase; 875 int minorbase; 876 int unit; 877 u_int flags; 878 int rid; 879 struct resource *port; 880 int ret; 881 882 rid = xrid; 883 port = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid, 884 0, ~0, IO_COMSIZE, RF_ACTIVE); 885 if (!port) 886 return (ENXIO); 887 888 iobase = rman_get_start(port); 889 unit = device_get_unit(dev); 890 com = device_get_softc(dev); 891 flags = device_get_flags(dev); 892 893 if (unit >= sio_numunits) 894 sio_numunits = unit + 1; 895 /* 896 * sioprobe() has initialized the device registers as follows: 897 * o cfcr = CFCR_8BITS. 898 * It is most important that CFCR_DLAB is off, so that the 899 * data port is not hidden when we enable interrupts. 900 * o ier = 0. 901 * Interrupts are only enabled when the line is open. 902 * o mcr = MCR_IENABLE, or 0 if the port has AST/4 compatible 903 * interrupt control register or the config specifies no irq. 904 * Keeping MCR_DTR and MCR_RTS off might stop the external 905 * device from sending before we are ready. 906 */ 907 bzero(com, sizeof *com); 908 com->unit = unit; 909 com->ioportres = port; 910 com->bst = rman_get_bustag(port); 911 com->bsh = rman_get_bushandle(port); 912 com->cfcr_image = CFCR_8BITS; 913 com->dtr_wait = 3 * hz; 914 com->loses_outints = COM_LOSESOUTINTS(flags) != 0; 915 com->no_irq = bus_get_resource(dev, SYS_RES_IRQ, 0, NULL, NULL) != 0; 916 com->tx_fifo_size = 1; 917 com->obufs[0].l_head = com->obuf1; 918 com->obufs[1].l_head = com->obuf2; 919 920 com->data_port = iobase + com_data; 921 com->int_id_port = iobase + com_iir; 922 com->modem_ctl_port = iobase + com_mcr; 923 com->mcr_image = inb(com->modem_ctl_port); 924 com->line_status_port = iobase + com_lsr; 925 com->modem_status_port = iobase + com_msr; 926 com->intr_ctl_port = iobase + com_ier; 927 928 if (rclk == 0) 929 rclk = DEFAULT_RCLK; 930 com->rclk = rclk; 931 932 /* 933 * We don't use all the flags from <sys/ttydefaults.h> since they 934 * are only relevant for logins. It's important to have echo off 935 * initially so that the line doesn't start blathering before the 936 * echo flag can be turned off. 937 */ 938 com->it_in.c_iflag = 0; 939 com->it_in.c_oflag = 0; 940 com->it_in.c_cflag = TTYDEF_CFLAG; 941 com->it_in.c_lflag = 0; 942 if (unit == comconsole) { 943 com->it_in.c_iflag = TTYDEF_IFLAG; 944 com->it_in.c_oflag = TTYDEF_OFLAG; 945 com->it_in.c_cflag = TTYDEF_CFLAG | CLOCAL; 946 com->it_in.c_lflag = TTYDEF_LFLAG; 947 com->lt_out.c_cflag = com->lt_in.c_cflag = CLOCAL; 948 com->lt_out.c_ispeed = com->lt_out.c_ospeed = 949 com->lt_in.c_ispeed = com->lt_in.c_ospeed = 950 com->it_in.c_ispeed = com->it_in.c_ospeed = comdefaultrate; 951 } else 952 com->it_in.c_ispeed = com->it_in.c_ospeed = TTYDEF_SPEED; 953 if (siosetwater(com, com->it_in.c_ispeed) != 0) { 954 mtx_unlock_spin(&sio_lock); 955 /* 956 * Leave i/o resources allocated if this is a `cn'-level 957 * console, so that other devices can't snarf them. 958 */ 959 if (iobase != siocniobase) 960 bus_release_resource(dev, SYS_RES_IOPORT, rid, port); 961 return (ENOMEM); 962 } 963 mtx_unlock_spin(&sio_lock); 964 termioschars(&com->it_in); 965 com->it_out = com->it_in; 966 967 /* attempt to determine UART type */ 968 printf("sio%d: type", unit); 969 970 971 if (!COM_ISMULTIPORT(flags) && 972 !COM_IIR_TXRDYBUG(flags) && !COM_NOSCR(flags)) { 973 u_char scr; 974 u_char scr1; 975 u_char scr2; 976 977 scr = sio_getreg(com, com_scr); 978 sio_setreg(com, com_scr, 0xa5); 979 scr1 = sio_getreg(com, com_scr); 980 sio_setreg(com, com_scr, 0x5a); 981 scr2 = sio_getreg(com, com_scr); 982 sio_setreg(com, com_scr, scr); 983 if (scr1 != 0xa5 || scr2 != 0x5a) { 984 printf(" 8250 or not responding"); 985 goto determined_type; 986 } 987 } 988 sio_setreg(com, com_fifo, FIFO_ENABLE | FIFO_RX_HIGH); 989 DELAY(100); 990 com->st16650a = 0; 991 switch (inb(com->int_id_port) & IIR_FIFO_MASK) { 992 case FIFO_RX_LOW: 993 printf(" 16450"); 994 break; 995 case FIFO_RX_MEDL: 996 printf(" 16450?"); 997 break; 998 case FIFO_RX_MEDH: 999 printf(" 16550?"); 1000 break; 1001 case FIFO_RX_HIGH: 1002 if (COM_NOFIFO(flags)) { 1003 printf(" 16550A fifo disabled"); 1004 } else { 1005 com->hasfifo = TRUE; 1006 if (COM_ST16650A(flags)) { 1007 com->st16650a = 1; 1008 com->tx_fifo_size = 32; 1009 printf(" ST16650A"); 1010 } else { 1011 com->tx_fifo_size = COM_FIFOSIZE(flags); 1012 printf(" 16550A"); 1013 } 1014 } 1015#ifdef COM_ESP 1016 for (espp = likely_esp_ports; *espp != 0; espp++) 1017 if (espattach(com, *espp)) { 1018 com->tx_fifo_size = 1024; 1019 break; 1020 } 1021#endif 1022 if (!com->st16650a) { 1023 if (!com->tx_fifo_size) 1024 com->tx_fifo_size = 16; 1025 else 1026 printf(" lookalike with %d bytes FIFO", 1027 com->tx_fifo_size); 1028 } 1029 1030 break; 1031 } 1032 1033#ifdef COM_ESP 1034 if (com->esp) { 1035 /* 1036 * Set 16550 compatibility mode. 1037 * We don't use the ESP_MODE_SCALE bit to increase the 1038 * fifo trigger levels because we can't handle large 1039 * bursts of input. 1040 * XXX flow control should be set in comparam(), not here. 1041 */ 1042 outb(com->esp_port + ESP_CMD1, ESP_SETMODE); 1043 outb(com->esp_port + ESP_CMD2, ESP_MODE_RTS | ESP_MODE_FIFO); 1044 1045 /* Set RTS/CTS flow control. */ 1046 outb(com->esp_port + ESP_CMD1, ESP_SETFLOWTYPE); 1047 outb(com->esp_port + ESP_CMD2, ESP_FLOW_RTS); 1048 outb(com->esp_port + ESP_CMD2, ESP_FLOW_CTS); 1049 1050 /* Set flow-control levels. */ 1051 outb(com->esp_port + ESP_CMD1, ESP_SETRXFLOW); 1052 outb(com->esp_port + ESP_CMD2, HIBYTE(768)); 1053 outb(com->esp_port + ESP_CMD2, LOBYTE(768)); 1054 outb(com->esp_port + ESP_CMD2, HIBYTE(512)); 1055 outb(com->esp_port + ESP_CMD2, LOBYTE(512)); 1056 } 1057#endif /* COM_ESP */ 1058 sio_setreg(com, com_fifo, 0); 1059determined_type: ; 1060 1061#ifdef COM_MULTIPORT 1062 if (COM_ISMULTIPORT(flags)) { 1063 device_t masterdev; 1064 1065 com->multiport = TRUE; 1066 printf(" (multiport"); 1067 if (unit == COM_MPMASTER(flags)) 1068 printf(" master"); 1069 printf(")"); 1070 masterdev = devclass_get_device(sio_devclass, 1071 COM_MPMASTER(flags)); 1072 com->no_irq = (masterdev == NULL || bus_get_resource(masterdev, 1073 SYS_RES_IRQ, 0, NULL, NULL) != 0); 1074 } 1075#endif /* COM_MULTIPORT */ 1076 if (unit == comconsole) 1077 printf(", console"); 1078 if (COM_IIR_TXRDYBUG(flags)) 1079 printf(" with a bogus IIR_TXRDY register"); 1080 printf("\n"); 1081 1082 if (sio_fast_ih == NULL) { 1083 swi_add(&tty_ithd, "tty:sio", siopoll, NULL, SWI_TTY, 0, 1084 &sio_fast_ih); 1085 swi_add(&clk_ithd, "tty:sio", siopoll, NULL, SWI_TTY, 0, 1086 &sio_slow_ih); 1087 } 1088 minorbase = UNIT_TO_MINOR(unit); 1089 com->devs[0] = make_dev(&sio_cdevsw, minorbase, 1090 UID_ROOT, GID_WHEEL, 0600, "ttyd%r", unit); 1091 com->devs[1] = make_dev(&sio_cdevsw, minorbase | CONTROL_INIT_STATE, 1092 UID_ROOT, GID_WHEEL, 0600, "ttyid%r", unit); 1093 com->devs[2] = make_dev(&sio_cdevsw, minorbase | CONTROL_LOCK_STATE, 1094 UID_ROOT, GID_WHEEL, 0600, "ttyld%r", unit); 1095 com->devs[3] = make_dev(&sio_cdevsw, minorbase | CALLOUT_MASK, 1096 UID_UUCP, GID_DIALER, 0660, "cuaa%r", unit); 1097 com->devs[4] = make_dev(&sio_cdevsw, 1098 minorbase | CALLOUT_MASK | CONTROL_INIT_STATE, 1099 UID_UUCP, GID_DIALER, 0660, "cuaia%r", unit); 1100 com->devs[5] = make_dev(&sio_cdevsw, 1101 minorbase | CALLOUT_MASK | CONTROL_LOCK_STATE, 1102 UID_UUCP, GID_DIALER, 0660, "cuala%r", unit); 1103 for (rid = 0; rid < 6; rid++) 1104 com->devs[rid]->si_drv1 = com; 1105 com->flags = flags; 1106 com->pps.ppscap = PPS_CAPTUREASSERT | PPS_CAPTURECLEAR; 1107 1108 if (COM_PPSCTS(flags)) 1109 com->pps_bit = MSR_CTS; 1110 else 1111 com->pps_bit = MSR_DCD; 1112 pps_init(&com->pps); 1113 1114 rid = 0; 1115 com->irqres = bus_alloc_resource(dev, SYS_RES_IRQ, &rid, 0ul, ~0ul, 1, 1116 RF_ACTIVE); 1117 if (com->irqres) { 1118 ret = BUS_SETUP_INTR(device_get_parent(dev), dev, com->irqres, 1119 INTR_TYPE_TTY | INTR_FAST, 1120 siointr, com, &com->cookie); 1121 if (ret) { 1122 ret = BUS_SETUP_INTR(device_get_parent(dev), dev, 1123 com->irqres, INTR_TYPE_TTY, 1124 siointr, com, &com->cookie); 1125 if (ret == 0) 1126 device_printf(dev, "unable to activate interrupt in fast mode - using normal mode\n"); 1127 } 1128 if (ret) 1129 device_printf(dev, "could not activate interrupt\n"); 1130#if defined(DDB) && (defined(BREAK_TO_DEBUGGER) || \ 1131 defined(ALT_BREAK_TO_DEBUGGER)) 1132 /* 1133 * Enable interrupts for early break-to-debugger support 1134 * on the console. 1135 */ 1136 if (ret == 0 && unit == comconsole) 1137 outb(siocniobase + com_ier, IER_ERXRDY | IER_ERLS | 1138 IER_EMSC); 1139#endif 1140 } 1141 1142 return (0); 1143} 1144 1145static int 1146sioopen(dev, flag, mode, td) 1147 dev_t dev; 1148 int flag; 1149 int mode; 1150 struct thread *td; 1151{ 1152 struct com_s *com; 1153 int error; 1154 int mynor; 1155 int s; 1156 struct tty *tp; 1157 int unit; 1158 1159 mynor = minor(dev); 1160 unit = MINOR_TO_UNIT(mynor); 1161 com = com_addr(unit); 1162 if (com == NULL) 1163 return (ENXIO); 1164 if (com->gone) 1165 return (ENXIO); 1166 if (mynor & CONTROL_MASK) 1167 return (0); 1168 tp = dev->si_tty = com->tp = ttymalloc(com->tp); 1169 s = spltty(); 1170 /* 1171 * We jump to this label after all non-interrupted sleeps to pick 1172 * up any changes of the device state. 1173 */ 1174open_top: 1175 while (com->state & CS_DTR_OFF) { 1176 error = tsleep(&com->dtr_wait, TTIPRI | PCATCH, "siodtr", 0); 1177 if (com_addr(unit) == NULL) 1178 return (ENXIO); 1179 if (error != 0 || com->gone) 1180 goto out; 1181 } 1182 if (tp->t_state & TS_ISOPEN) { 1183 /* 1184 * The device is open, so everything has been initialized. 1185 * Handle conflicts. 1186 */ 1187 if (mynor & CALLOUT_MASK) { 1188 if (!com->active_out) { 1189 error = EBUSY; 1190 goto out; 1191 } 1192 } else { 1193 if (com->active_out) { 1194 if (flag & O_NONBLOCK) { 1195 error = EBUSY; 1196 goto out; 1197 } 1198 error = tsleep(&com->active_out, 1199 TTIPRI | PCATCH, "siobi", 0); 1200 if (com_addr(unit) == NULL) 1201 return (ENXIO); 1202 if (error != 0 || com->gone) 1203 goto out; 1204 goto open_top; 1205 } 1206 } 1207 if (tp->t_state & TS_XCLUDE && 1208 suser(td)) { 1209 error = EBUSY; 1210 goto out; 1211 } 1212 } else { 1213 /* 1214 * The device isn't open, so there are no conflicts. 1215 * Initialize it. Initialization is done twice in many 1216 * cases: to preempt sleeping callin opens if we are 1217 * callout, and to complete a callin open after DCD rises. 1218 */ 1219 tp->t_oproc = comstart; 1220 tp->t_param = comparam; 1221 tp->t_stop = comstop; 1222 tp->t_dev = dev; 1223 tp->t_termios = mynor & CALLOUT_MASK 1224 ? com->it_out : com->it_in; 1225 (void)commctl(com, TIOCM_DTR | TIOCM_RTS, DMSET); 1226 com->poll = com->no_irq; 1227 com->poll_output = com->loses_outints; 1228 ++com->wopeners; 1229 error = comparam(tp, &tp->t_termios); 1230 --com->wopeners; 1231 if (error != 0) 1232 goto out; 1233 /* 1234 * XXX we should goto open_top if comparam() slept. 1235 */ 1236 if (com->hasfifo) { 1237 int i; 1238 /* 1239 * (Re)enable and drain fifos. 1240 * 1241 * Certain SMC chips cause problems if the fifos 1242 * are enabled while input is ready. Turn off the 1243 * fifo if necessary to clear the input. We test 1244 * the input ready bit after enabling the fifos 1245 * since we've already enabled them in comparam() 1246 * and to handle races between enabling and fresh 1247 * input. 1248 */ 1249 for (i = 0; i < 500; i++) { 1250 sio_setreg(com, com_fifo, 1251 FIFO_RCV_RST | FIFO_XMT_RST 1252 | com->fifo_image); 1253 /* 1254 * XXX the delays are for superstitious 1255 * historical reasons. It must be less than 1256 * the character time at the maximum 1257 * supported speed (87 usec at 115200 bps 1258 * 8N1). Otherwise we might loop endlessly 1259 * if data is streaming in. We used to use 1260 * delays of 100. That usually worked 1261 * because DELAY(100) used to usually delay 1262 * for about 85 usec instead of 100. 1263 */ 1264 DELAY(50); 1265 if (!(inb(com->line_status_port) & LSR_RXRDY)) 1266 break; 1267 sio_setreg(com, com_fifo, 0); 1268 DELAY(50); 1269 (void) inb(com->data_port); 1270 } 1271 if (i == 500) { 1272 error = EIO; 1273 goto out; 1274 } 1275 } 1276 1277 mtx_lock_spin(&sio_lock); 1278 (void) inb(com->line_status_port); 1279 (void) inb(com->data_port); 1280 com->prev_modem_status = com->last_modem_status 1281 = inb(com->modem_status_port); 1282 if (COM_IIR_TXRDYBUG(com->flags)) { 1283 outb(com->intr_ctl_port, IER_ERXRDY | IER_ERLS 1284 | IER_EMSC); 1285 } else { 1286 outb(com->intr_ctl_port, IER_ERXRDY | IER_ETXRDY 1287 | IER_ERLS | IER_EMSC); 1288 } 1289 mtx_unlock_spin(&sio_lock); 1290 /* 1291 * Handle initial DCD. Callout devices get a fake initial 1292 * DCD (trapdoor DCD). If we are callout, then any sleeping 1293 * callin opens get woken up and resume sleeping on "siobi" 1294 * instead of "siodcd". 1295 */ 1296 /* 1297 * XXX `mynor & CALLOUT_MASK' should be 1298 * `tp->t_cflag & (SOFT_CARRIER | TRAPDOOR_CARRIER) where 1299 * TRAPDOOR_CARRIER is the default initial state for callout 1300 * devices and SOFT_CARRIER is like CLOCAL except it hides 1301 * the true carrier. 1302 */ 1303 if (com->prev_modem_status & MSR_DCD || mynor & CALLOUT_MASK) 1304 (*linesw[tp->t_line].l_modem)(tp, 1); 1305 } 1306 /* 1307 * Wait for DCD if necessary. 1308 */ 1309 if (!(tp->t_state & TS_CARR_ON) && !(mynor & CALLOUT_MASK) 1310 && !(tp->t_cflag & CLOCAL) && !(flag & O_NONBLOCK)) { 1311 ++com->wopeners; 1312 error = tsleep(TSA_CARR_ON(tp), TTIPRI | PCATCH, "siodcd", 0); 1313 if (com_addr(unit) == NULL) 1314 return (ENXIO); 1315 --com->wopeners; 1316 if (error != 0 || com->gone) 1317 goto out; 1318 goto open_top; 1319 } 1320 error = (*linesw[tp->t_line].l_open)(dev, tp); 1321 disc_optim(tp, &tp->t_termios, com); 1322 if (tp->t_state & TS_ISOPEN && mynor & CALLOUT_MASK) 1323 com->active_out = TRUE; 1324 siosettimeout(); 1325out: 1326 splx(s); 1327 if (!(tp->t_state & TS_ISOPEN) && com->wopeners == 0) 1328 comhardclose(com); 1329 return (error); 1330} 1331 1332static int 1333sioclose(dev, flag, mode, td) 1334 dev_t dev; 1335 int flag; 1336 int mode; 1337 struct thread *td; 1338{ 1339 struct com_s *com; 1340 int mynor; 1341 int s; 1342 struct tty *tp; 1343 1344 mynor = minor(dev); 1345 if (mynor & CONTROL_MASK) 1346 return (0); 1347 com = com_addr(MINOR_TO_UNIT(mynor)); 1348 if (com == NULL) 1349 return (ENODEV); 1350 tp = com->tp; 1351 s = spltty(); 1352 (*linesw[tp->t_line].l_close)(tp, flag); 1353 disc_optim(tp, &tp->t_termios, com); 1354 comstop(tp, FREAD | FWRITE); 1355 comhardclose(com); 1356 ttyclose(tp); 1357 siosettimeout(); 1358 splx(s); 1359 if (com->gone) { 1360 printf("sio%d: gone\n", com->unit); 1361 s = spltty(); 1362 if (com->ibuf != NULL) 1363 free(com->ibuf, M_DEVBUF); 1364 bzero(tp, sizeof *tp); 1365 splx(s); 1366 } 1367 return (0); 1368} 1369 1370static void 1371comhardclose(com) 1372 struct com_s *com; 1373{ 1374 int s; 1375 struct tty *tp; 1376 int unit; 1377 1378 unit = com->unit; 1379 s = spltty(); 1380 com->poll = FALSE; 1381 com->poll_output = FALSE; 1382 com->do_timestamp = FALSE; 1383 com->do_dcd_timestamp = FALSE; 1384 com->pps.ppsparam.mode = 0; 1385 sio_setreg(com, com_cfcr, com->cfcr_image &= ~CFCR_SBREAK); 1386 tp = com->tp; 1387 1388#if defined(DDB) && (defined(BREAK_TO_DEBUGGER) || \ 1389 defined(ALT_BREAK_TO_DEBUGGER)) 1390 /* 1391 * Leave interrupts enabled and don't clear DTR if this is the 1392 * console. This allows us to detect break-to-debugger events 1393 * while the console device is closed. 1394 */ 1395 if (com->unit != comconsole) 1396#endif 1397 { 1398 sio_setreg(com, com_ier, 0); 1399 if (tp->t_cflag & HUPCL 1400 /* 1401 * XXX we will miss any carrier drop between here and the 1402 * next open. Perhaps we should watch DCD even when the 1403 * port is closed; it is not sufficient to check it at 1404 * the next open because it might go up and down while 1405 * we're not watching. 1406 */ 1407 || (!com->active_out 1408 && !(com->prev_modem_status & MSR_DCD) 1409 && !(com->it_in.c_cflag & CLOCAL)) 1410 || !(tp->t_state & TS_ISOPEN)) { 1411 (void)commctl(com, TIOCM_DTR, DMBIC); 1412 if (com->dtr_wait != 0 && !(com->state & CS_DTR_OFF)) { 1413 timeout(siodtrwakeup, com, com->dtr_wait); 1414 com->state |= CS_DTR_OFF; 1415 } 1416 } 1417 } 1418 if (com->hasfifo) { 1419 /* 1420 * Disable fifos so that they are off after controlled 1421 * reboots. Some BIOSes fail to detect 16550s when the 1422 * fifos are enabled. 1423 */ 1424 sio_setreg(com, com_fifo, 0); 1425 } 1426 com->active_out = FALSE; 1427 wakeup(&com->active_out); 1428 wakeup(TSA_CARR_ON(tp)); /* restart any wopeners */ 1429 splx(s); 1430} 1431 1432static int 1433sioread(dev, uio, flag) 1434 dev_t dev; 1435 struct uio *uio; 1436 int flag; 1437{ 1438 int mynor; 1439 struct com_s *com; 1440 1441 mynor = minor(dev); 1442 if (mynor & CONTROL_MASK) 1443 return (ENODEV); 1444 com = com_addr(MINOR_TO_UNIT(mynor)); 1445 if (com == NULL || com->gone) 1446 return (ENODEV); 1447 return ((*linesw[com->tp->t_line].l_read)(com->tp, uio, flag)); 1448} 1449 1450static int 1451siowrite(dev, uio, flag) 1452 dev_t dev; 1453 struct uio *uio; 1454 int flag; 1455{ 1456 int mynor; 1457 struct com_s *com; 1458 int unit; 1459 1460 mynor = minor(dev); 1461 if (mynor & CONTROL_MASK) 1462 return (ENODEV); 1463 1464 unit = MINOR_TO_UNIT(mynor); 1465 com = com_addr(unit); 1466 if (com == NULL || com->gone) 1467 return (ENODEV); 1468 /* 1469 * (XXX) We disallow virtual consoles if the physical console is 1470 * a serial port. This is in case there is a display attached that 1471 * is not the console. In that situation we don't need/want the X 1472 * server taking over the console. 1473 */ 1474 if (constty != NULL && unit == comconsole) 1475 constty = NULL; 1476 return ((*linesw[com->tp->t_line].l_write)(com->tp, uio, flag)); 1477} 1478 1479static void 1480siobusycheck(chan) 1481 void *chan; 1482{ 1483 struct com_s *com; 1484 int s; 1485 1486 com = (struct com_s *)chan; 1487 1488 /* 1489 * Clear TS_BUSY if low-level output is complete. 1490 * spl locking is sufficient because siointr1() does not set CS_BUSY. 1491 * If siointr1() clears CS_BUSY after we look at it, then we'll get 1492 * called again. Reading the line status port outside of siointr1() 1493 * is safe because CS_BUSY is clear so there are no output interrupts 1494 * to lose. 1495 */ 1496 s = spltty(); 1497 if (com->state & CS_BUSY) 1498 com->extra_state &= ~CSE_BUSYCHECK; /* False alarm. */ 1499 else if ((inb(com->line_status_port) & (LSR_TSRE | LSR_TXRDY)) 1500 == (LSR_TSRE | LSR_TXRDY)) { 1501 com->tp->t_state &= ~TS_BUSY; 1502 ttwwakeup(com->tp); 1503 com->extra_state &= ~CSE_BUSYCHECK; 1504 } else 1505 timeout(siobusycheck, com, hz / 100); 1506 splx(s); 1507} 1508 1509static u_int 1510siodivisor(rclk, speed) 1511 u_long rclk; 1512 speed_t speed; 1513{ 1514 long actual_speed; 1515 u_int divisor; 1516 int error; 1517 1518 if (speed == 0 || speed > (ULONG_MAX - 1) / 8) 1519 return (0); 1520 divisor = (rclk / (8UL * speed) + 1) / 2; 1521 if (divisor == 0 || divisor >= 65536) 1522 return (0); 1523 actual_speed = rclk / (16UL * divisor); 1524 1525 /* 10 times error in percent: */ 1526 error = ((actual_speed - (long)speed) * 2000 / (long)speed + 1) / 2; 1527 1528 /* 3.0% maximum error tolerance: */ 1529 if (error < -30 || error > 30) 1530 return (0); 1531 1532 return (divisor); 1533} 1534 1535static void 1536siodtrwakeup(chan) 1537 void *chan; 1538{ 1539 struct com_s *com; 1540 1541 com = (struct com_s *)chan; 1542 com->state &= ~CS_DTR_OFF; 1543 wakeup(&com->dtr_wait); 1544} 1545 1546/* 1547 * Call this function with the sio_lock mutex held. It will return with the 1548 * lock still held. 1549 */ 1550static void 1551sioinput(com) 1552 struct com_s *com; 1553{ 1554 u_char *buf; 1555 int incc; 1556 u_char line_status; 1557 int recv_data; 1558 struct tty *tp; 1559 1560 buf = com->ibuf; 1561 tp = com->tp; 1562 if (!(tp->t_state & TS_ISOPEN) || !(tp->t_cflag & CREAD)) { 1563 com_events -= (com->iptr - com->ibuf); 1564 com->iptr = com->ibuf; 1565 return; 1566 } 1567 if (tp->t_state & TS_CAN_BYPASS_L_RINT) { 1568 /* 1569 * Avoid the grotesquely inefficient lineswitch routine 1570 * (ttyinput) in "raw" mode. It usually takes about 450 1571 * instructions (that's without canonical processing or echo!). 1572 * slinput is reasonably fast (usually 40 instructions plus 1573 * call overhead). 1574 */ 1575 do { 1576 /* 1577 * This may look odd, but it is using save-and-enable 1578 * semantics instead of the save-and-disable semantics 1579 * that are used everywhere else. 1580 */ 1581 mtx_unlock_spin(&sio_lock); 1582 incc = com->iptr - buf; 1583 if (tp->t_rawq.c_cc + incc > tp->t_ihiwat 1584 && (com->state & CS_RTS_IFLOW 1585 || tp->t_iflag & IXOFF) 1586 && !(tp->t_state & TS_TBLOCK)) 1587 ttyblock(tp); 1588 com->delta_error_counts[CE_TTY_BUF_OVERFLOW] 1589 += b_to_q((char *)buf, incc, &tp->t_rawq); 1590 buf += incc; 1591 tk_nin += incc; 1592 tk_rawcc += incc; 1593 tp->t_rawcc += incc; 1594 ttwakeup(tp); 1595 if (tp->t_state & TS_TTSTOP 1596 && (tp->t_iflag & IXANY 1597 || tp->t_cc[VSTART] == tp->t_cc[VSTOP])) { 1598 tp->t_state &= ~TS_TTSTOP; 1599 tp->t_lflag &= ~FLUSHO; 1600 comstart(tp); 1601 } 1602 mtx_lock_spin(&sio_lock); 1603 } while (buf < com->iptr); 1604 } else { 1605 do { 1606 /* 1607 * This may look odd, but it is using save-and-enable 1608 * semantics instead of the save-and-disable semantics 1609 * that are used everywhere else. 1610 */ 1611 mtx_unlock_spin(&sio_lock); 1612 line_status = buf[com->ierroff]; 1613 recv_data = *buf++; 1614 if (line_status 1615 & (LSR_BI | LSR_FE | LSR_OE | LSR_PE)) { 1616 if (line_status & LSR_BI) 1617 recv_data |= TTY_BI; 1618 if (line_status & LSR_FE) 1619 recv_data |= TTY_FE; 1620 if (line_status & LSR_OE) 1621 recv_data |= TTY_OE; 1622 if (line_status & LSR_PE) 1623 recv_data |= TTY_PE; 1624 } 1625 (*linesw[tp->t_line].l_rint)(recv_data, tp); 1626 mtx_lock_spin(&sio_lock); 1627 } while (buf < com->iptr); 1628 } 1629 com_events -= (com->iptr - com->ibuf); 1630 com->iptr = com->ibuf; 1631 1632 /* 1633 * There is now room for another low-level buffer full of input, 1634 * so enable RTS if it is now disabled and there is room in the 1635 * high-level buffer. 1636 */ 1637 if ((com->state & CS_RTS_IFLOW) && !(com->mcr_image & MCR_RTS) && 1638 !(tp->t_state & TS_TBLOCK)) 1639 outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS); 1640} 1641 1642static void 1643siointr(arg) 1644 void *arg; 1645{ 1646 struct com_s *com; 1647 1648#ifndef COM_MULTIPORT 1649 com = (struct com_s *)arg; 1650 1651 mtx_lock_spin(&sio_lock); 1652 siointr1(com); 1653 mtx_unlock_spin(&sio_lock); 1654#else /* COM_MULTIPORT */ 1655 bool_t possibly_more_intrs; 1656 int unit; 1657 1658 /* 1659 * Loop until there is no activity on any port. This is necessary 1660 * to get an interrupt edge more than to avoid another interrupt. 1661 * If the IRQ signal is just an OR of the IRQ signals from several 1662 * devices, then the edge from one may be lost because another is 1663 * on. 1664 */ 1665 mtx_lock_spin(&sio_lock); 1666 do { 1667 possibly_more_intrs = FALSE; 1668 for (unit = 0; unit < sio_numunits; ++unit) { 1669 com = com_addr(unit); 1670 /* 1671 * XXX COM_LOCK(); 1672 * would it work here, or be counter-productive? 1673 */ 1674 if (com != NULL 1675 && !com->gone 1676 && (inb(com->int_id_port) & IIR_IMASK) 1677 != IIR_NOPEND) { 1678 siointr1(com); 1679 possibly_more_intrs = TRUE; 1680 } 1681 /* XXX COM_UNLOCK(); */ 1682 } 1683 } while (possibly_more_intrs); 1684 mtx_unlock_spin(&sio_lock); 1685#endif /* COM_MULTIPORT */ 1686} 1687 1688static struct timespec siots[8192]; 1689static int siotso; 1690static int volatile siotsunit = -1; 1691 1692static int 1693sysctl_siots(SYSCTL_HANDLER_ARGS) 1694{ 1695 char buf[128]; 1696 long long delta; 1697 size_t len; 1698 int error, i; 1699 1700 for (i = 1; i < siotso; i++) { 1701 delta = (long long)(siots[i].tv_sec - siots[i - 1].tv_sec) * 1702 1000000000 + 1703 (siots[i].tv_nsec - siots[i - 1].tv_nsec); 1704 len = sprintf(buf, "%lld\n", delta); 1705 if (delta >= 110000) 1706 len += sprintf(buf + len - 1, ": *** %ld.%09ld\n", 1707 (long)siots[i].tv_sec, siots[i].tv_nsec); 1708 if (i == siotso - 1) 1709 buf[len - 1] = '\0'; 1710 error = SYSCTL_OUT(req, buf, len); 1711 if (error != 0) 1712 return (error); 1713 uio_yield(); 1714 } 1715 return (0); 1716} 1717 1718SYSCTL_PROC(_machdep, OID_AUTO, siots, CTLTYPE_STRING | CTLFLAG_RD, 1719 0, 0, sysctl_siots, "A", "sio timestamps"); 1720 1721static void 1722siointr1(com) 1723 struct com_s *com; 1724{ 1725 u_char line_status; 1726 u_char modem_status; 1727 u_char *ioptr; 1728 u_char recv_data; 1729 u_char int_ctl; 1730 u_char int_ctl_new; 1731 1732 int_ctl = inb(com->intr_ctl_port); 1733 int_ctl_new = int_ctl; 1734 1735 while (!com->gone) { 1736 if (com->pps.ppsparam.mode & PPS_CAPTUREBOTH) { 1737 modem_status = inb(com->modem_status_port); 1738 if ((modem_status ^ com->last_modem_status) & 1739 com->pps_bit) { 1740 pps_capture(&com->pps); 1741 pps_event(&com->pps, 1742 (modem_status & com->pps_bit) ? 1743 PPS_CAPTUREASSERT : PPS_CAPTURECLEAR); 1744 } 1745 } 1746 line_status = inb(com->line_status_port); 1747 1748 /* input event? (check first to help avoid overruns) */ 1749 while (line_status & LSR_RCV_MASK) { 1750 /* break/unnattached error bits or real input? */ 1751 if (!(line_status & LSR_RXRDY)) 1752 recv_data = 0; 1753 else 1754 recv_data = inb(com->data_port); 1755#if defined(DDB) && defined(ALT_BREAK_TO_DEBUGGER) 1756 /* 1757 * Solaris implements a new BREAK which is initiated 1758 * by a character sequence CR ~ ^b which is similar 1759 * to a familiar pattern used on Sun servers by the 1760 * Remote Console. 1761 */ 1762#define KEY_CRTLB 2 /* ^B */ 1763#define KEY_CR 13 /* CR '\r' */ 1764#define KEY_TILDE 126 /* ~ */ 1765 1766 if (com->unit == comconsole) { 1767 static int brk_state1 = 0, brk_state2 = 0; 1768 if (recv_data == KEY_CR) { 1769 brk_state1 = recv_data; 1770 brk_state2 = 0; 1771 } else if (brk_state1 == KEY_CR 1772 && (recv_data == KEY_TILDE 1773 || recv_data == KEY_CRTLB)) { 1774 if (recv_data == KEY_TILDE) 1775 brk_state2 = recv_data; 1776 else if (brk_state2 == KEY_TILDE 1777 && recv_data == KEY_CRTLB) { 1778 breakpoint(); 1779 brk_state1 = 0; 1780 brk_state2 = 0; 1781 goto cont; 1782 } else 1783 brk_state2 = 0; 1784 } else 1785 brk_state1 = 0; 1786 } 1787#endif 1788 if (line_status & (LSR_BI | LSR_FE | LSR_PE)) { 1789 /* 1790 * Don't store BI if IGNBRK or FE/PE if IGNPAR. 1791 * Otherwise, push the work to a higher level 1792 * (to handle PARMRK) if we're bypassing. 1793 * Otherwise, convert BI/FE and PE+INPCK to 0. 1794 * 1795 * This makes bypassing work right in the 1796 * usual "raw" case (IGNBRK set, and IGNPAR 1797 * and INPCK clear). 1798 * 1799 * Note: BI together with FE/PE means just BI. 1800 */ 1801 if (line_status & LSR_BI) { 1802#if defined(DDB) && defined(BREAK_TO_DEBUGGER) 1803 if (com->unit == comconsole) { 1804 breakpoint(); 1805 goto cont; 1806 } 1807#endif 1808 if (com->tp == NULL 1809 || com->tp->t_iflag & IGNBRK) 1810 goto cont; 1811 } else { 1812 if (com->tp == NULL 1813 || com->tp->t_iflag & IGNPAR) 1814 goto cont; 1815 } 1816 if (com->tp->t_state & TS_CAN_BYPASS_L_RINT 1817 && (line_status & (LSR_BI | LSR_FE) 1818 || com->tp->t_iflag & INPCK)) 1819 recv_data = 0; 1820 } 1821 ++com->bytes_in; 1822 if (com->hotchar != 0 && recv_data == com->hotchar) 1823 swi_sched(sio_fast_ih, 0); 1824 ioptr = com->iptr; 1825 if (ioptr >= com->ibufend) 1826 CE_RECORD(com, CE_INTERRUPT_BUF_OVERFLOW); 1827 else { 1828 if (com->do_timestamp) 1829 microtime(&com->timestamp); 1830 ++com_events; 1831 swi_sched(sio_slow_ih, SWI_DELAY); 1832#if 0 /* for testing input latency vs efficiency */ 1833if (com->iptr - com->ibuf == 8) 1834 swi_sched(sio_fast_ih, 0); 1835#endif 1836 ioptr[0] = recv_data; 1837 ioptr[com->ierroff] = line_status; 1838 com->iptr = ++ioptr; 1839 if (ioptr == com->ihighwater 1840 && com->state & CS_RTS_IFLOW) 1841 outb(com->modem_ctl_port, 1842 com->mcr_image &= ~MCR_RTS); 1843 if (line_status & LSR_OE) 1844 CE_RECORD(com, CE_OVERRUN); 1845 } 1846cont: 1847 /* 1848 * "& 0x7F" is to avoid the gcc-1.40 generating a slow 1849 * jump from the top of the loop to here 1850 */ 1851 line_status = inb(com->line_status_port) & 0x7F; 1852 } 1853 1854 /* modem status change? (always check before doing output) */ 1855 modem_status = inb(com->modem_status_port); 1856 if (modem_status != com->last_modem_status) { 1857 if (com->do_dcd_timestamp 1858 && !(com->last_modem_status & MSR_DCD) 1859 && modem_status & MSR_DCD) 1860 microtime(&com->dcd_timestamp); 1861 1862 /* 1863 * Schedule high level to handle DCD changes. Note 1864 * that we don't use the delta bits anywhere. Some 1865 * UARTs mess them up, and it's easy to remember the 1866 * previous bits and calculate the delta. 1867 */ 1868 com->last_modem_status = modem_status; 1869 if (!(com->state & CS_CHECKMSR)) { 1870 com_events += LOTS_OF_EVENTS; 1871 com->state |= CS_CHECKMSR; 1872 swi_sched(sio_fast_ih, 0); 1873 } 1874 1875 /* handle CTS change immediately for crisp flow ctl */ 1876 if (com->state & CS_CTS_OFLOW) { 1877 if (modem_status & MSR_CTS) 1878 com->state |= CS_ODEVREADY; 1879 else 1880 com->state &= ~CS_ODEVREADY; 1881 } 1882 } 1883 1884 /* output queued and everything ready? */ 1885 if (line_status & LSR_TXRDY 1886 && com->state >= (CS_BUSY | CS_TTGO | CS_ODEVREADY)) { 1887 ioptr = com->obufq.l_head; 1888 if (com->tx_fifo_size > 1 && com->unit != siotsunit) { 1889 u_int ocount; 1890 1891 ocount = com->obufq.l_tail - ioptr; 1892 if (ocount > com->tx_fifo_size) 1893 ocount = com->tx_fifo_size; 1894 com->bytes_out += ocount; 1895 do 1896 outb(com->data_port, *ioptr++); 1897 while (--ocount != 0); 1898 } else { 1899 outb(com->data_port, *ioptr++); 1900 ++com->bytes_out; 1901 if (com->unit == siotsunit) { 1902 nanouptime(&siots[siotso]); 1903 siotso = (siotso + 1) % 1904 (sizeof siots / sizeof siots[0]); 1905 } 1906 } 1907 com->obufq.l_head = ioptr; 1908 if (COM_IIR_TXRDYBUG(com->flags)) { 1909 int_ctl_new = int_ctl | IER_ETXRDY; 1910 } 1911 if (ioptr >= com->obufq.l_tail) { 1912 struct lbq *qp; 1913 1914 qp = com->obufq.l_next; 1915 qp->l_queued = FALSE; 1916 qp = qp->l_next; 1917 if (qp != NULL) { 1918 com->obufq.l_head = qp->l_head; 1919 com->obufq.l_tail = qp->l_tail; 1920 com->obufq.l_next = qp; 1921 } else { 1922 /* output just completed */ 1923 if (COM_IIR_TXRDYBUG(com->flags)) { 1924 int_ctl_new = int_ctl & ~IER_ETXRDY; 1925 } 1926 com->state &= ~CS_BUSY; 1927 } 1928 if (!(com->state & CS_ODONE)) { 1929 com_events += LOTS_OF_EVENTS; 1930 com->state |= CS_ODONE; 1931 /* handle at high level ASAP */ 1932 swi_sched(sio_fast_ih, 0); 1933 } 1934 } 1935 if (COM_IIR_TXRDYBUG(com->flags) && (int_ctl != int_ctl_new)) { 1936 outb(com->intr_ctl_port, int_ctl_new); 1937 } 1938 } 1939 1940 /* finished? */ 1941#ifndef COM_MULTIPORT 1942 if ((inb(com->int_id_port) & IIR_IMASK) == IIR_NOPEND) 1943#endif /* COM_MULTIPORT */ 1944 return; 1945 } 1946} 1947 1948static int 1949sioioctl(dev, cmd, data, flag, td) 1950 dev_t dev; 1951 u_long cmd; 1952 caddr_t data; 1953 int flag; 1954 struct thread *td; 1955{ 1956 struct com_s *com; 1957 int error; 1958 int mynor; 1959 int s; 1960 struct tty *tp; 1961#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 1962 u_long oldcmd; 1963 struct termios term; 1964#endif 1965 1966 mynor = minor(dev); 1967 com = com_addr(MINOR_TO_UNIT(mynor)); 1968 if (com == NULL || com->gone) 1969 return (ENODEV); 1970 if (mynor & CONTROL_MASK) { 1971 struct termios *ct; 1972 1973 switch (mynor & CONTROL_MASK) { 1974 case CONTROL_INIT_STATE: 1975 ct = mynor & CALLOUT_MASK ? &com->it_out : &com->it_in; 1976 break; 1977 case CONTROL_LOCK_STATE: 1978 ct = mynor & CALLOUT_MASK ? &com->lt_out : &com->lt_in; 1979 break; 1980 default: 1981 return (ENODEV); /* /dev/nodev */ 1982 } 1983 switch (cmd) { 1984 case TIOCSETA: 1985 error = suser(td); 1986 if (error != 0) 1987 return (error); 1988 *ct = *(struct termios *)data; 1989 return (0); 1990 case TIOCGETA: 1991 *(struct termios *)data = *ct; 1992 return (0); 1993 case TIOCGETD: 1994 *(int *)data = TTYDISC; 1995 return (0); 1996 case TIOCGWINSZ: 1997 bzero(data, sizeof(struct winsize)); 1998 return (0); 1999 default: 2000 return (ENOTTY); 2001 } 2002 } 2003 tp = com->tp; 2004#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 2005 term = tp->t_termios; 2006 oldcmd = cmd; 2007 error = ttsetcompat(tp, &cmd, data, &term); 2008 if (error != 0) 2009 return (error); 2010 if (cmd != oldcmd) 2011 data = (caddr_t)&term; 2012#endif 2013 if (cmd == TIOCSETA || cmd == TIOCSETAW || cmd == TIOCSETAF) { 2014 int cc; 2015 struct termios *dt = (struct termios *)data; 2016 struct termios *lt = mynor & CALLOUT_MASK 2017 ? &com->lt_out : &com->lt_in; 2018 2019 dt->c_iflag = (tp->t_iflag & lt->c_iflag) 2020 | (dt->c_iflag & ~lt->c_iflag); 2021 dt->c_oflag = (tp->t_oflag & lt->c_oflag) 2022 | (dt->c_oflag & ~lt->c_oflag); 2023 dt->c_cflag = (tp->t_cflag & lt->c_cflag) 2024 | (dt->c_cflag & ~lt->c_cflag); 2025 dt->c_lflag = (tp->t_lflag & lt->c_lflag) 2026 | (dt->c_lflag & ~lt->c_lflag); 2027 for (cc = 0; cc < NCCS; ++cc) 2028 if (lt->c_cc[cc] != 0) 2029 dt->c_cc[cc] = tp->t_cc[cc]; 2030 if (lt->c_ispeed != 0) 2031 dt->c_ispeed = tp->t_ispeed; 2032 if (lt->c_ospeed != 0) 2033 dt->c_ospeed = tp->t_ospeed; 2034 } 2035 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, td); 2036 if (error != ENOIOCTL) 2037 return (error); 2038 s = spltty(); 2039 error = ttioctl(tp, cmd, data, flag); 2040 disc_optim(tp, &tp->t_termios, com); 2041 if (error != ENOIOCTL) { 2042 splx(s); 2043 return (error); 2044 } 2045 switch (cmd) { 2046 case TIOCSBRK: 2047 sio_setreg(com, com_cfcr, com->cfcr_image |= CFCR_SBREAK); 2048 break; 2049 case TIOCCBRK: 2050 sio_setreg(com, com_cfcr, com->cfcr_image &= ~CFCR_SBREAK); 2051 break; 2052 case TIOCSDTR: 2053 (void)commctl(com, TIOCM_DTR, DMBIS); 2054 break; 2055 case TIOCCDTR: 2056 (void)commctl(com, TIOCM_DTR, DMBIC); 2057 break; 2058 /* 2059 * XXX should disallow changing MCR_RTS if CS_RTS_IFLOW is set. The 2060 * changes get undone on the next call to comparam(). 2061 */ 2062 case TIOCMSET: 2063 (void)commctl(com, *(int *)data, DMSET); 2064 break; 2065 case TIOCMBIS: 2066 (void)commctl(com, *(int *)data, DMBIS); 2067 break; 2068 case TIOCMBIC: 2069 (void)commctl(com, *(int *)data, DMBIC); 2070 break; 2071 case TIOCMGET: 2072 *(int *)data = commctl(com, 0, DMGET); 2073 break; 2074 case TIOCMSDTRWAIT: 2075 /* must be root since the wait applies to following logins */ 2076 error = suser(td); 2077 if (error != 0) { 2078 splx(s); 2079 return (error); 2080 } 2081 com->dtr_wait = *(int *)data * hz / 100; 2082 break; 2083 case TIOCMGDTRWAIT: 2084 *(int *)data = com->dtr_wait * 100 / hz; 2085 break; 2086 case TIOCTIMESTAMP: 2087 com->do_timestamp = TRUE; 2088 *(struct timeval *)data = com->timestamp; 2089 break; 2090 case TIOCDCDTIMESTAMP: 2091 com->do_dcd_timestamp = TRUE; 2092 *(struct timeval *)data = com->dcd_timestamp; 2093 break; 2094 default: 2095 splx(s); 2096 error = pps_ioctl(cmd, data, &com->pps); 2097 if (error == ENODEV) 2098 error = ENOTTY; 2099 return (error); 2100 } 2101 splx(s); 2102 return (0); 2103} 2104 2105/* software interrupt handler for SWI_TTY */ 2106static void 2107siopoll(void *dummy) 2108{ 2109 int unit; 2110 2111 if (com_events == 0) 2112 return; 2113repeat: 2114 for (unit = 0; unit < sio_numunits; ++unit) { 2115 struct com_s *com; 2116 int incc; 2117 struct tty *tp; 2118 2119 com = com_addr(unit); 2120 if (com == NULL) 2121 continue; 2122 tp = com->tp; 2123 if (tp == NULL || com->gone) { 2124 /* 2125 * Discard any events related to never-opened or 2126 * going-away devices. 2127 */ 2128 mtx_lock_spin(&sio_lock); 2129 incc = com->iptr - com->ibuf; 2130 com->iptr = com->ibuf; 2131 if (com->state & CS_CHECKMSR) { 2132 incc += LOTS_OF_EVENTS; 2133 com->state &= ~CS_CHECKMSR; 2134 } 2135 com_events -= incc; 2136 mtx_unlock_spin(&sio_lock); 2137 continue; 2138 } 2139 if (com->iptr != com->ibuf) { 2140 mtx_lock_spin(&sio_lock); 2141 sioinput(com); 2142 mtx_unlock_spin(&sio_lock); 2143 } 2144 if (com->state & CS_CHECKMSR) { 2145 u_char delta_modem_status; 2146 2147 mtx_lock_spin(&sio_lock); 2148 delta_modem_status = com->last_modem_status 2149 ^ com->prev_modem_status; 2150 com->prev_modem_status = com->last_modem_status; 2151 com_events -= LOTS_OF_EVENTS; 2152 com->state &= ~CS_CHECKMSR; 2153 mtx_unlock_spin(&sio_lock); 2154 if (delta_modem_status & MSR_DCD) 2155 (*linesw[tp->t_line].l_modem) 2156 (tp, com->prev_modem_status & MSR_DCD); 2157 } 2158 if (com->state & CS_ODONE) { 2159 mtx_lock_spin(&sio_lock); 2160 com_events -= LOTS_OF_EVENTS; 2161 com->state &= ~CS_ODONE; 2162 mtx_unlock_spin(&sio_lock); 2163 if (!(com->state & CS_BUSY) 2164 && !(com->extra_state & CSE_BUSYCHECK)) { 2165 timeout(siobusycheck, com, hz / 100); 2166 com->extra_state |= CSE_BUSYCHECK; 2167 } 2168 (*linesw[tp->t_line].l_start)(tp); 2169 } 2170 if (com_events == 0) 2171 break; 2172 } 2173 if (com_events >= LOTS_OF_EVENTS) 2174 goto repeat; 2175} 2176 2177static int 2178comparam(tp, t) 2179 struct tty *tp; 2180 struct termios *t; 2181{ 2182 u_int cfcr; 2183 int cflag; 2184 struct com_s *com; 2185 u_int divisor; 2186 u_char dlbh; 2187 u_char dlbl; 2188 int s; 2189 int unit; 2190 2191 unit = DEV_TO_UNIT(tp->t_dev); 2192 com = com_addr(unit); 2193 if (com == NULL) 2194 return (ENODEV); 2195 2196 /* do historical conversions */ 2197 if (t->c_ispeed == 0) 2198 t->c_ispeed = t->c_ospeed; 2199 2200 /* check requested parameters */ 2201 if (t->c_ospeed == 0) 2202 divisor = 0; 2203 else { 2204 if (t->c_ispeed != t->c_ospeed) 2205 return (EINVAL); 2206 divisor = siodivisor(com->rclk, t->c_ispeed); 2207 if (divisor == 0) 2208 return (EINVAL); 2209 } 2210 2211 /* parameters are OK, convert them to the com struct and the device */ 2212 s = spltty(); 2213 if (divisor == 0) 2214 (void)commctl(com, TIOCM_DTR, DMBIC); /* hang up line */ 2215 else 2216 (void)commctl(com, TIOCM_DTR, DMBIS); 2217 cflag = t->c_cflag; 2218 switch (cflag & CSIZE) { 2219 case CS5: 2220 cfcr = CFCR_5BITS; 2221 break; 2222 case CS6: 2223 cfcr = CFCR_6BITS; 2224 break; 2225 case CS7: 2226 cfcr = CFCR_7BITS; 2227 break; 2228 default: 2229 cfcr = CFCR_8BITS; 2230 break; 2231 } 2232 if (cflag & PARENB) { 2233 cfcr |= CFCR_PENAB; 2234 if (!(cflag & PARODD)) 2235 cfcr |= CFCR_PEVEN; 2236 } 2237 if (cflag & CSTOPB) 2238 cfcr |= CFCR_STOPB; 2239 2240 if (com->hasfifo && divisor != 0) { 2241 /* 2242 * Use a fifo trigger level low enough so that the input 2243 * latency from the fifo is less than about 16 msec and 2244 * the total latency is less than about 30 msec. These 2245 * latencies are reasonable for humans. Serial comms 2246 * protocols shouldn't expect anything better since modem 2247 * latencies are larger. 2248 * 2249 * The fifo trigger level cannot be set at RX_HIGH for high 2250 * speed connections without further work on reducing 2251 * interrupt disablement times in other parts of the system, 2252 * without producing silo overflow errors. 2253 */ 2254 com->fifo_image = com->unit == siotsunit ? 0 2255 : t->c_ospeed <= 4800 2256 ? FIFO_ENABLE : FIFO_ENABLE | FIFO_RX_MEDH; 2257#ifdef COM_ESP 2258 /* 2259 * The Hayes ESP card needs the fifo DMA mode bit set 2260 * in compatibility mode. If not, it will interrupt 2261 * for each character received. 2262 */ 2263 if (com->esp) 2264 com->fifo_image |= FIFO_DMA_MODE; 2265#endif 2266 sio_setreg(com, com_fifo, com->fifo_image); 2267 } 2268 2269 /* 2270 * This returns with interrupts disabled so that we can complete 2271 * the speed change atomically. Keeping interrupts disabled is 2272 * especially important while com_data is hidden. 2273 */ 2274 (void) siosetwater(com, t->c_ispeed); 2275 2276 if (divisor != 0) { 2277 sio_setreg(com, com_cfcr, cfcr | CFCR_DLAB); 2278 /* 2279 * Only set the divisor registers if they would change, 2280 * since on some 16550 incompatibles (UMC8669F), setting 2281 * them while input is arriving them loses sync until 2282 * data stops arriving. 2283 */ 2284 dlbl = divisor & 0xFF; 2285 if (sio_getreg(com, com_dlbl) != dlbl) 2286 sio_setreg(com, com_dlbl, dlbl); 2287 dlbh = divisor >> 8; 2288 if (sio_getreg(com, com_dlbh) != dlbh) 2289 sio_setreg(com, com_dlbh, dlbh); 2290 } 2291 2292 sio_setreg(com, com_cfcr, com->cfcr_image = cfcr); 2293 2294 if (!(tp->t_state & TS_TTSTOP)) 2295 com->state |= CS_TTGO; 2296 2297 if (cflag & CRTS_IFLOW) { 2298 if (com->st16650a) { 2299 sio_setreg(com, com_cfcr, 0xbf); 2300 sio_setreg(com, com_fifo, 2301 sio_getreg(com, com_fifo) | 0x40); 2302 } 2303 com->state |= CS_RTS_IFLOW; 2304 /* 2305 * If CS_RTS_IFLOW just changed from off to on, the change 2306 * needs to be propagated to MCR_RTS. This isn't urgent, 2307 * so do it later by calling comstart() instead of repeating 2308 * a lot of code from comstart() here. 2309 */ 2310 } else if (com->state & CS_RTS_IFLOW) { 2311 com->state &= ~CS_RTS_IFLOW; 2312 /* 2313 * CS_RTS_IFLOW just changed from on to off. Force MCR_RTS 2314 * on here, since comstart() won't do it later. 2315 */ 2316 outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS); 2317 if (com->st16650a) { 2318 sio_setreg(com, com_cfcr, 0xbf); 2319 sio_setreg(com, com_fifo, 2320 sio_getreg(com, com_fifo) & ~0x40); 2321 } 2322 } 2323 2324 2325 /* 2326 * Set up state to handle output flow control. 2327 * XXX - worth handling MDMBUF (DCD) flow control at the lowest level? 2328 * Now has 10+ msec latency, while CTS flow has 50- usec latency. 2329 */ 2330 com->state |= CS_ODEVREADY; 2331 com->state &= ~CS_CTS_OFLOW; 2332 if (cflag & CCTS_OFLOW) { 2333 com->state |= CS_CTS_OFLOW; 2334 if (!(com->last_modem_status & MSR_CTS)) 2335 com->state &= ~CS_ODEVREADY; 2336 if (com->st16650a) { 2337 sio_setreg(com, com_cfcr, 0xbf); 2338 sio_setreg(com, com_fifo, 2339 sio_getreg(com, com_fifo) | 0x80); 2340 } 2341 } else { 2342 if (com->st16650a) { 2343 sio_setreg(com, com_cfcr, 0xbf); 2344 sio_setreg(com, com_fifo, 2345 sio_getreg(com, com_fifo) & ~0x80); 2346 } 2347 } 2348 2349 sio_setreg(com, com_cfcr, com->cfcr_image); 2350 2351 /* XXX shouldn't call functions while intrs are disabled. */ 2352 disc_optim(tp, t, com); 2353 /* 2354 * Recover from fiddling with CS_TTGO. We used to call siointr1() 2355 * unconditionally, but that defeated the careful discarding of 2356 * stale input in sioopen(). 2357 */ 2358 if (com->state >= (CS_BUSY | CS_TTGO)) 2359 siointr1(com); 2360 2361 mtx_unlock_spin(&sio_lock); 2362 splx(s); 2363 comstart(tp); 2364 if (com->ibufold != NULL) { 2365 free(com->ibufold, M_DEVBUF); 2366 com->ibufold = NULL; 2367 } 2368 return (0); 2369} 2370 2371/* 2372 * This function must be called with the sio_lock mutex released and will 2373 * return with it obtained. 2374 */ 2375static int 2376siosetwater(com, speed) 2377 struct com_s *com; 2378 speed_t speed; 2379{ 2380 int cp4ticks; 2381 u_char *ibuf; 2382 int ibufsize; 2383 struct tty *tp; 2384 2385 /* 2386 * Make the buffer size large enough to handle a softtty interrupt 2387 * latency of about 2 ticks without loss of throughput or data 2388 * (about 3 ticks if input flow control is not used or not honoured, 2389 * but a bit less for CS5-CS7 modes). 2390 */ 2391 cp4ticks = speed / 10 / hz * 4; 2392 for (ibufsize = 128; ibufsize < cp4ticks;) 2393 ibufsize <<= 1; 2394 if (ibufsize == com->ibufsize) { 2395 mtx_lock_spin(&sio_lock); 2396 return (0); 2397 } 2398 2399 /* 2400 * Allocate input buffer. The extra factor of 2 in the size is 2401 * to allow for an error byte for each input byte. 2402 */ 2403 ibuf = malloc(2 * ibufsize, M_DEVBUF, M_NOWAIT); 2404 if (ibuf == NULL) { 2405 mtx_lock_spin(&sio_lock); 2406 return (ENOMEM); 2407 } 2408 2409 /* Initialize non-critical variables. */ 2410 com->ibufold = com->ibuf; 2411 com->ibufsize = ibufsize; 2412 tp = com->tp; 2413 if (tp != NULL) { 2414 tp->t_ififosize = 2 * ibufsize; 2415 tp->t_ispeedwat = (speed_t)-1; 2416 tp->t_ospeedwat = (speed_t)-1; 2417 } 2418 2419 /* 2420 * Read current input buffer, if any. Continue with interrupts 2421 * disabled. 2422 */ 2423 mtx_lock_spin(&sio_lock); 2424 if (com->iptr != com->ibuf) 2425 sioinput(com); 2426 2427 /*- 2428 * Initialize critical variables, including input buffer watermarks. 2429 * The external device is asked to stop sending when the buffer 2430 * exactly reaches high water, or when the high level requests it. 2431 * The high level is notified immediately (rather than at a later 2432 * clock tick) when this watermark is reached. 2433 * The buffer size is chosen so the watermark should almost never 2434 * be reached. 2435 * The low watermark is invisibly 0 since the buffer is always 2436 * emptied all at once. 2437 */ 2438 com->iptr = com->ibuf = ibuf; 2439 com->ibufend = ibuf + ibufsize; 2440 com->ierroff = ibufsize; 2441 com->ihighwater = ibuf + 3 * ibufsize / 4; 2442 return (0); 2443} 2444 2445static void 2446comstart(tp) 2447 struct tty *tp; 2448{ 2449 struct com_s *com; 2450 int s; 2451 int unit; 2452 2453 unit = DEV_TO_UNIT(tp->t_dev); 2454 com = com_addr(unit); 2455 if (com == NULL) 2456 return; 2457 s = spltty(); 2458 mtx_lock_spin(&sio_lock); 2459 if (tp->t_state & TS_TTSTOP) 2460 com->state &= ~CS_TTGO; 2461 else 2462 com->state |= CS_TTGO; 2463 if (tp->t_state & TS_TBLOCK) { 2464 if (com->mcr_image & MCR_RTS && com->state & CS_RTS_IFLOW) 2465 outb(com->modem_ctl_port, com->mcr_image &= ~MCR_RTS); 2466 } else { 2467 if (!(com->mcr_image & MCR_RTS) && com->iptr < com->ihighwater 2468 && com->state & CS_RTS_IFLOW) 2469 outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS); 2470 } 2471 mtx_unlock_spin(&sio_lock); 2472 if (tp->t_state & (TS_TIMEOUT | TS_TTSTOP)) { 2473 ttwwakeup(tp); 2474 splx(s); 2475 return; 2476 } 2477 if (tp->t_outq.c_cc != 0) { 2478 struct lbq *qp; 2479 struct lbq *next; 2480 2481 if (!com->obufs[0].l_queued) { 2482 com->obufs[0].l_tail 2483 = com->obuf1 + q_to_b(&tp->t_outq, com->obuf1, 2484 sizeof com->obuf1); 2485 com->obufs[0].l_next = NULL; 2486 com->obufs[0].l_queued = TRUE; 2487 mtx_lock_spin(&sio_lock); 2488 if (com->state & CS_BUSY) { 2489 qp = com->obufq.l_next; 2490 while ((next = qp->l_next) != NULL) 2491 qp = next; 2492 qp->l_next = &com->obufs[0]; 2493 } else { 2494 com->obufq.l_head = com->obufs[0].l_head; 2495 com->obufq.l_tail = com->obufs[0].l_tail; 2496 com->obufq.l_next = &com->obufs[0]; 2497 com->state |= CS_BUSY; 2498 } 2499 mtx_unlock_spin(&sio_lock); 2500 } 2501 if (tp->t_outq.c_cc != 0 && !com->obufs[1].l_queued) { 2502 com->obufs[1].l_tail 2503 = com->obuf2 + q_to_b(&tp->t_outq, com->obuf2, 2504 sizeof com->obuf2); 2505 com->obufs[1].l_next = NULL; 2506 com->obufs[1].l_queued = TRUE; 2507 mtx_lock_spin(&sio_lock); 2508 if (com->state & CS_BUSY) { 2509 qp = com->obufq.l_next; 2510 while ((next = qp->l_next) != NULL) 2511 qp = next; 2512 qp->l_next = &com->obufs[1]; 2513 } else { 2514 com->obufq.l_head = com->obufs[1].l_head; 2515 com->obufq.l_tail = com->obufs[1].l_tail; 2516 com->obufq.l_next = &com->obufs[1]; 2517 com->state |= CS_BUSY; 2518 } 2519 mtx_unlock_spin(&sio_lock); 2520 } 2521 tp->t_state |= TS_BUSY; 2522 } 2523 mtx_lock_spin(&sio_lock); 2524 if (com->state >= (CS_BUSY | CS_TTGO)) 2525 siointr1(com); /* fake interrupt to start output */ 2526 mtx_unlock_spin(&sio_lock); 2527 ttwwakeup(tp); 2528 splx(s); 2529} 2530 2531static void 2532comstop(tp, rw) 2533 struct tty *tp; 2534 int rw; 2535{ 2536 struct com_s *com; 2537 2538 com = com_addr(DEV_TO_UNIT(tp->t_dev)); 2539 if (com == NULL || com->gone) 2540 return; 2541 mtx_lock_spin(&sio_lock); 2542 if (rw & FWRITE) { 2543 if (com->hasfifo) 2544#ifdef COM_ESP 2545 /* XXX avoid h/w bug. */ 2546 if (!com->esp) 2547#endif 2548 sio_setreg(com, com_fifo, 2549 FIFO_XMT_RST | com->fifo_image); 2550 com->obufs[0].l_queued = FALSE; 2551 com->obufs[1].l_queued = FALSE; 2552 if (com->state & CS_ODONE) 2553 com_events -= LOTS_OF_EVENTS; 2554 com->state &= ~(CS_ODONE | CS_BUSY); 2555 com->tp->t_state &= ~TS_BUSY; 2556 } 2557 if (rw & FREAD) { 2558 if (com->hasfifo) 2559#ifdef COM_ESP 2560 /* XXX avoid h/w bug. */ 2561 if (!com->esp) 2562#endif 2563 sio_setreg(com, com_fifo, 2564 FIFO_RCV_RST | com->fifo_image); 2565 com_events -= (com->iptr - com->ibuf); 2566 com->iptr = com->ibuf; 2567 } 2568 mtx_unlock_spin(&sio_lock); 2569 comstart(tp); 2570} 2571 2572static int 2573commctl(com, bits, how) 2574 struct com_s *com; 2575 int bits; 2576 int how; 2577{ 2578 int mcr; 2579 int msr; 2580 2581 if (how == DMGET) { 2582 bits = TIOCM_LE; /* XXX - always enabled while open */ 2583 mcr = com->mcr_image; 2584 if (mcr & MCR_DTR) 2585 bits |= TIOCM_DTR; 2586 if (mcr & MCR_RTS) 2587 bits |= TIOCM_RTS; 2588 msr = com->prev_modem_status; 2589 if (msr & MSR_CTS) 2590 bits |= TIOCM_CTS; 2591 if (msr & MSR_DCD) 2592 bits |= TIOCM_CD; 2593 if (msr & MSR_DSR) 2594 bits |= TIOCM_DSR; 2595 /* 2596 * XXX - MSR_RI is naturally volatile, and we make MSR_TERI 2597 * more volatile by reading the modem status a lot. Perhaps 2598 * we should latch both bits until the status is read here. 2599 */ 2600 if (msr & (MSR_RI | MSR_TERI)) 2601 bits |= TIOCM_RI; 2602 return (bits); 2603 } 2604 mcr = 0; 2605 if (bits & TIOCM_DTR) 2606 mcr |= MCR_DTR; 2607 if (bits & TIOCM_RTS) 2608 mcr |= MCR_RTS; 2609 if (com->gone) 2610 return(0); 2611 mtx_lock_spin(&sio_lock); 2612 switch (how) { 2613 case DMSET: 2614 outb(com->modem_ctl_port, 2615 com->mcr_image = mcr | (com->mcr_image & MCR_IENABLE)); 2616 break; 2617 case DMBIS: 2618 outb(com->modem_ctl_port, com->mcr_image |= mcr); 2619 break; 2620 case DMBIC: 2621 outb(com->modem_ctl_port, com->mcr_image &= ~mcr); 2622 break; 2623 } 2624 mtx_unlock_spin(&sio_lock); 2625 return (0); 2626} 2627 2628static void 2629siosettimeout() 2630{ 2631 struct com_s *com; 2632 bool_t someopen; 2633 int unit; 2634 2635 /* 2636 * Set our timeout period to 1 second if no polled devices are open. 2637 * Otherwise set it to max(1/200, 1/hz). 2638 * Enable timeouts iff some device is open. 2639 */ 2640 untimeout(comwakeup, (void *)NULL, sio_timeout_handle); 2641 sio_timeout = hz; 2642 someopen = FALSE; 2643 for (unit = 0; unit < sio_numunits; ++unit) { 2644 com = com_addr(unit); 2645 if (com != NULL && com->tp != NULL 2646 && com->tp->t_state & TS_ISOPEN && !com->gone) { 2647 someopen = TRUE; 2648 if (com->poll || com->poll_output) { 2649 sio_timeout = hz > 200 ? hz / 200 : 1; 2650 break; 2651 } 2652 } 2653 } 2654 if (someopen) { 2655 sio_timeouts_until_log = hz / sio_timeout; 2656 sio_timeout_handle = timeout(comwakeup, (void *)NULL, 2657 sio_timeout); 2658 } else { 2659 /* Flush error messages, if any. */ 2660 sio_timeouts_until_log = 1; 2661 comwakeup((void *)NULL); 2662 untimeout(comwakeup, (void *)NULL, sio_timeout_handle); 2663 } 2664} 2665 2666static void 2667comwakeup(chan) 2668 void *chan; 2669{ 2670 struct com_s *com; 2671 int unit; 2672 2673 sio_timeout_handle = timeout(comwakeup, (void *)NULL, sio_timeout); 2674 2675 /* 2676 * Recover from lost output interrupts. 2677 * Poll any lines that don't use interrupts. 2678 */ 2679 for (unit = 0; unit < sio_numunits; ++unit) { 2680 com = com_addr(unit); 2681 if (com != NULL && !com->gone 2682 && (com->state >= (CS_BUSY | CS_TTGO) || com->poll)) { 2683 mtx_lock_spin(&sio_lock); 2684 siointr1(com); 2685 mtx_unlock_spin(&sio_lock); 2686 } 2687 } 2688 2689 /* 2690 * Check for and log errors, but not too often. 2691 */ 2692 if (--sio_timeouts_until_log > 0) 2693 return; 2694 sio_timeouts_until_log = hz / sio_timeout; 2695 for (unit = 0; unit < sio_numunits; ++unit) { 2696 int errnum; 2697 2698 com = com_addr(unit); 2699 if (com == NULL) 2700 continue; 2701 if (com->gone) 2702 continue; 2703 for (errnum = 0; errnum < CE_NTYPES; ++errnum) { 2704 u_int delta; 2705 u_long total; 2706 2707 mtx_lock_spin(&sio_lock); 2708 delta = com->delta_error_counts[errnum]; 2709 com->delta_error_counts[errnum] = 0; 2710 mtx_unlock_spin(&sio_lock); 2711 if (delta == 0) 2712 continue; 2713 total = com->error_counts[errnum] += delta; 2714 log(LOG_ERR, "sio%d: %u more %s%s (total %lu)\n", 2715 unit, delta, error_desc[errnum], 2716 delta == 1 ? "" : "s", total); 2717 } 2718 } 2719} 2720 2721static void 2722disc_optim(tp, t, com) 2723 struct tty *tp; 2724 struct termios *t; 2725 struct com_s *com; 2726{ 2727 if (!(t->c_iflag & (ICRNL | IGNCR | IMAXBEL | INLCR | ISTRIP | IXON)) 2728 && (!(t->c_iflag & BRKINT) || (t->c_iflag & IGNBRK)) 2729 && (!(t->c_iflag & PARMRK) 2730 || (t->c_iflag & (IGNPAR | IGNBRK)) == (IGNPAR | IGNBRK)) 2731 && !(t->c_lflag & (ECHO | ICANON | IEXTEN | ISIG | PENDIN)) 2732 && linesw[tp->t_line].l_rint == ttyinput) 2733 tp->t_state |= TS_CAN_BYPASS_L_RINT; 2734 else 2735 tp->t_state &= ~TS_CAN_BYPASS_L_RINT; 2736 com->hotchar = linesw[tp->t_line].l_hotchar; 2737} 2738 2739/* 2740 * Following are all routines needed for SIO to act as console 2741 */ 2742#include <sys/cons.h> 2743 2744struct siocnstate { 2745 u_char dlbl; 2746 u_char dlbh; 2747 u_char ier; 2748 u_char cfcr; 2749 u_char mcr; 2750}; 2751 2752#ifndef __alpha__ 2753static speed_t siocngetspeed(Port_t, u_long rclk); 2754#endif 2755static void siocnclose(struct siocnstate *sp, Port_t iobase); 2756static void siocnopen(struct siocnstate *sp, Port_t iobase, int speed); 2757static void siocntxwait(Port_t iobase); 2758 2759#ifdef __alpha__ 2760int siocnattach(int port, int speed); 2761int siogdbattach(int port, int speed); 2762int siogdbgetc(void); 2763void siogdbputc(int c); 2764#else 2765static cn_probe_t siocnprobe; 2766static cn_init_t siocninit; 2767static cn_term_t siocnterm; 2768#endif 2769static cn_checkc_t siocncheckc; 2770static cn_getc_t siocngetc; 2771static cn_putc_t siocnputc; 2772 2773#ifndef __alpha__ 2774CONS_DRIVER(sio, siocnprobe, siocninit, siocnterm, siocngetc, siocncheckc, 2775 siocnputc, NULL); 2776#endif 2777 2778/* To get the GDB related variables */ 2779#if DDB > 0 2780#include <ddb/ddb.h> 2781static struct consdev gdbconsdev; 2782 2783#endif 2784 2785static void 2786siocntxwait(iobase) 2787 Port_t iobase; 2788{ 2789 int timo; 2790 2791 /* 2792 * Wait for any pending transmission to finish. Required to avoid 2793 * the UART lockup bug when the speed is changed, and for normal 2794 * transmits. 2795 */ 2796 timo = 100000; 2797 while ((inb(iobase + com_lsr) & (LSR_TSRE | LSR_TXRDY)) 2798 != (LSR_TSRE | LSR_TXRDY) && --timo != 0) 2799 ; 2800} 2801 2802#ifndef __alpha__ 2803 2804/* 2805 * Read the serial port specified and try to figure out what speed 2806 * it's currently running at. We're assuming the serial port has 2807 * been initialized and is basicly idle. This routine is only intended 2808 * to be run at system startup. 2809 * 2810 * If the value read from the serial port doesn't make sense, return 0. 2811 */ 2812 2813static speed_t 2814siocngetspeed(iobase, rclk) 2815 Port_t iobase; 2816 u_long rclk; 2817{ 2818 u_int divisor; 2819 u_char dlbh; 2820 u_char dlbl; 2821 u_char cfcr; 2822 2823 cfcr = inb(iobase + com_cfcr); 2824 outb(iobase + com_cfcr, CFCR_DLAB | cfcr); 2825 2826 dlbl = inb(iobase + com_dlbl); 2827 dlbh = inb(iobase + com_dlbh); 2828 2829 outb(iobase + com_cfcr, cfcr); 2830 2831 divisor = dlbh << 8 | dlbl; 2832 2833 /* XXX there should be more sanity checking. */ 2834 if (divisor == 0) 2835 return (CONSPEED); 2836 return (rclk / (16UL * divisor)); 2837} 2838 2839#endif 2840 2841static void 2842siocnopen(sp, iobase, speed) 2843 struct siocnstate *sp; 2844 Port_t iobase; 2845 int speed; 2846{ 2847 u_int divisor; 2848 u_char dlbh; 2849 u_char dlbl; 2850 2851 /* 2852 * Save all the device control registers except the fifo register 2853 * and set our default ones (cs8 -parenb speed=comdefaultrate). 2854 * We can't save the fifo register since it is read-only. 2855 */ 2856 sp->ier = inb(iobase + com_ier); 2857 outb(iobase + com_ier, 0); /* spltty() doesn't stop siointr() */ 2858 siocntxwait(iobase); 2859 sp->cfcr = inb(iobase + com_cfcr); 2860 outb(iobase + com_cfcr, CFCR_DLAB | CFCR_8BITS); 2861 sp->dlbl = inb(iobase + com_dlbl); 2862 sp->dlbh = inb(iobase + com_dlbh); 2863 /* 2864 * Only set the divisor registers if they would change, since on 2865 * some 16550 incompatibles (Startech), setting them clears the 2866 * data input register. This also reduces the effects of the 2867 * UMC8669F bug. 2868 */ 2869 divisor = siodivisor(comdefaultrclk, speed); 2870 dlbl = divisor & 0xFF; 2871 if (sp->dlbl != dlbl) 2872 outb(iobase + com_dlbl, dlbl); 2873 dlbh = divisor >> 8; 2874 if (sp->dlbh != dlbh) 2875 outb(iobase + com_dlbh, dlbh); 2876 outb(iobase + com_cfcr, CFCR_8BITS); 2877 sp->mcr = inb(iobase + com_mcr); 2878 /* 2879 * We don't want interrupts, but must be careful not to "disable" 2880 * them by clearing the MCR_IENABLE bit, since that might cause 2881 * an interrupt by floating the IRQ line. 2882 */ 2883 outb(iobase + com_mcr, (sp->mcr & MCR_IENABLE) | MCR_DTR | MCR_RTS); 2884} 2885 2886static void 2887siocnclose(sp, iobase) 2888 struct siocnstate *sp; 2889 Port_t iobase; 2890{ 2891 /* 2892 * Restore the device control registers. 2893 */ 2894 siocntxwait(iobase); 2895 outb(iobase + com_cfcr, CFCR_DLAB | CFCR_8BITS); 2896 if (sp->dlbl != inb(iobase + com_dlbl)) 2897 outb(iobase + com_dlbl, sp->dlbl); 2898 if (sp->dlbh != inb(iobase + com_dlbh)) 2899 outb(iobase + com_dlbh, sp->dlbh); 2900 outb(iobase + com_cfcr, sp->cfcr); 2901 /* 2902 * XXX damp oscillations of MCR_DTR and MCR_RTS by not restoring them. 2903 */ 2904 outb(iobase + com_mcr, sp->mcr | MCR_DTR | MCR_RTS); 2905 outb(iobase + com_ier, sp->ier); 2906} 2907 2908#ifndef __alpha__ 2909 2910static void 2911siocnprobe(cp) 2912 struct consdev *cp; 2913{ 2914 speed_t boot_speed; 2915 u_char cfcr; 2916 u_int divisor; 2917 int s, unit; 2918 struct siocnstate sp; 2919 2920 /* 2921 * Find our first enabled console, if any. If it is a high-level 2922 * console device, then initialize it and return successfully. 2923 * If it is a low-level console device, then initialize it and 2924 * return unsuccessfully. It must be initialized in both cases 2925 * for early use by console drivers and debuggers. Initializing 2926 * the hardware is not necessary in all cases, since the i/o 2927 * routines initialize it on the fly, but it is necessary if 2928 * input might arrive while the hardware is switched back to an 2929 * uninitialized state. We can't handle multiple console devices 2930 * yet because our low-level routines don't take a device arg. 2931 * We trust the user to set the console flags properly so that we 2932 * don't need to probe. 2933 */ 2934 cp->cn_pri = CN_DEAD; 2935 2936 for (unit = 0; unit < 16; unit++) { /* XXX need to know how many */ 2937 int flags; 2938 int disabled; 2939 if (resource_int_value("sio", unit, "disabled", &disabled) == 0) { 2940 if (disabled) 2941 continue; 2942 } 2943 if (resource_int_value("sio", unit, "flags", &flags)) 2944 continue; 2945 if (COM_CONSOLE(flags) || COM_DEBUGGER(flags)) { 2946 int port; 2947 Port_t iobase; 2948 2949 if (resource_int_value("sio", unit, "port", &port)) 2950 continue; 2951 iobase = port; 2952 s = spltty(); 2953 if (boothowto & RB_SERIAL) { 2954 boot_speed = 2955 siocngetspeed(iobase, comdefaultrclk); 2956 if (boot_speed) 2957 comdefaultrate = boot_speed; 2958 } 2959 2960 /* 2961 * Initialize the divisor latch. We can't rely on 2962 * siocnopen() to do this the first time, since it 2963 * avoids writing to the latch if the latch appears 2964 * to have the correct value. Also, if we didn't 2965 * just read the speed from the hardware, then we 2966 * need to set the speed in hardware so that 2967 * switching it later is null. 2968 */ 2969 cfcr = inb(iobase + com_cfcr); 2970 outb(iobase + com_cfcr, CFCR_DLAB | cfcr); 2971 divisor = siodivisor(comdefaultrclk, comdefaultrate); 2972 outb(iobase + com_dlbl, divisor & 0xff); 2973 outb(iobase + com_dlbh, divisor >> 8); 2974 outb(iobase + com_cfcr, cfcr); 2975 2976 siocnopen(&sp, iobase, comdefaultrate); 2977 2978 splx(s); 2979 if (COM_CONSOLE(flags) && !COM_LLCONSOLE(flags)) { 2980 cp->cn_dev = makedev(CDEV_MAJOR, unit); 2981 cp->cn_pri = COM_FORCECONSOLE(flags) 2982 || boothowto & RB_SERIAL 2983 ? CN_REMOTE : CN_NORMAL; 2984 siocniobase = iobase; 2985 siocnunit = unit; 2986 } 2987 if (COM_DEBUGGER(flags)) { 2988 printf("sio%d: gdb debugging port\n", unit); 2989 siogdbiobase = iobase; 2990 siogdbunit = unit; 2991#if DDB > 0 2992 gdbconsdev.cn_dev = makedev(CDEV_MAJOR, unit); 2993 gdb_arg = &gdbconsdev; 2994 gdb_getc = siocngetc; 2995 gdb_putc = siocnputc; 2996#endif 2997 } 2998 } 2999 } 3000#ifdef __i386__ 3001#if DDB > 0 3002 /* 3003 * XXX Ugly Compatability. 3004 * If no gdb port has been specified, set it to be the console 3005 * as some configuration files don't specify the gdb port. 3006 */ 3007 if (gdb_arg == NULL && (boothowto & RB_GDB)) { 3008 printf("Warning: no GDB port specified. Defaulting to sio%d.\n", 3009 siocnunit); 3010 printf("Set flag 0x80 on desired GDB port in your\n"); 3011 printf("configuration file (currently sio only).\n"); 3012 siogdbiobase = siocniobase; 3013 siogdbunit = siocnunit; 3014 gdbconsdev.cn_dev = makedev(CDEV_MAJOR, siocnunit); 3015 gdb_arg = &gdbconsdev; 3016 gdb_getc = siocngetc; 3017 gdb_putc = siocnputc; 3018 } 3019#endif 3020#endif 3021} 3022 3023static void 3024siocninit(cp) 3025 struct consdev *cp; 3026{ 3027 comconsole = DEV_TO_UNIT(cp->cn_dev); 3028} 3029 3030static void 3031siocnterm(cp) 3032 struct consdev *cp; 3033{ 3034 comconsole = -1; 3035} 3036 3037#endif 3038 3039#ifdef __alpha__ 3040 3041CONS_DRIVER(sio, NULL, NULL, NULL, siocngetc, siocncheckc, siocnputc, NULL); 3042 3043int 3044siocnattach(port, speed) 3045 int port; 3046 int speed; 3047{ 3048 int s; 3049 u_char cfcr; 3050 u_int divisor; 3051 struct siocnstate sp; 3052 int unit = 0; /* XXX random value! */ 3053 3054 siocniobase = port; 3055 siocnunit = unit; 3056 comdefaultrate = speed; 3057 sio_consdev.cn_pri = CN_NORMAL; 3058 sio_consdev.cn_dev = makedev(CDEV_MAJOR, unit); 3059 3060 s = spltty(); 3061 3062 /* 3063 * Initialize the divisor latch. We can't rely on 3064 * siocnopen() to do this the first time, since it 3065 * avoids writing to the latch if the latch appears 3066 * to have the correct value. Also, if we didn't 3067 * just read the speed from the hardware, then we 3068 * need to set the speed in hardware so that 3069 * switching it later is null. 3070 */ 3071 cfcr = inb(siocniobase + com_cfcr); 3072 outb(siocniobase + com_cfcr, CFCR_DLAB | cfcr); 3073 divisor = siodivisor(comdefaultrclk, comdefaultrate); 3074 outb(siocniobase + com_dlbl, divisor & 0xff); 3075 outb(siocniobase + com_dlbh, divisor >> 8); 3076 outb(siocniobase + com_cfcr, cfcr); 3077 3078 siocnopen(&sp, siocniobase, comdefaultrate); 3079 splx(s); 3080 3081 cnadd(&sio_consdev); 3082 return (0); 3083} 3084 3085int 3086siogdbattach(port, speed) 3087 int port; 3088 int speed; 3089{ 3090 int s; 3091 u_char cfcr; 3092 u_int divisor; 3093 struct siocnstate sp; 3094 int unit = 1; /* XXX random value! */ 3095 3096 siogdbiobase = port; 3097 gdbdefaultrate = speed; 3098 3099 printf("sio%d: gdb debugging port\n", unit); 3100 siogdbunit = unit; 3101#if DDB > 0 3102 gdbconsdev.cn_dev = makedev(CDEV_MAJOR, unit); 3103 gdb_arg = &gdbconsdev; 3104 gdb_getc = siocngetc; 3105 gdb_putc = siocnputc; 3106#endif 3107 3108 s = spltty(); 3109 3110 /* 3111 * Initialize the divisor latch. We can't rely on 3112 * siocnopen() to do this the first time, since it 3113 * avoids writing to the latch if the latch appears 3114 * to have the correct value. Also, if we didn't 3115 * just read the speed from the hardware, then we 3116 * need to set the speed in hardware so that 3117 * switching it later is null. 3118 */ 3119 cfcr = inb(siogdbiobase + com_cfcr); 3120 outb(siogdbiobase + com_cfcr, CFCR_DLAB | cfcr); 3121 divisor = siodivisor(comdefaultrclk, gdbdefaultrate); 3122 outb(siogdbiobase + com_dlbl, divisor & 0xff); 3123 outb(siogdbiobase + com_dlbh, divisor >> 8); 3124 outb(siogdbiobase + com_cfcr, cfcr); 3125 3126 siocnopen(&sp, siogdbiobase, gdbdefaultrate); 3127 splx(s); 3128 3129 return (0); 3130} 3131 3132#endif 3133 3134static int 3135siocncheckc(struct consdev *cd) 3136{ 3137 int c; 3138 dev_t dev; 3139 Port_t iobase; 3140 int s; 3141 struct siocnstate sp; 3142 speed_t speed; 3143 3144 dev = cd->cn_dev; 3145 if (minor(dev) == siocnunit) { 3146 iobase = siocniobase; 3147 speed = comdefaultrate; 3148 } else { 3149 iobase = siogdbiobase; 3150 speed = gdbdefaultrate; 3151 } 3152 s = spltty(); 3153 siocnopen(&sp, iobase, speed); 3154 if (inb(iobase + com_lsr) & LSR_RXRDY) 3155 c = inb(iobase + com_data); 3156 else 3157 c = -1; 3158 siocnclose(&sp, iobase); 3159 splx(s); 3160 return (c); 3161} 3162 3163 3164static int 3165siocngetc(struct consdev *cd) 3166{ 3167 int c; 3168 dev_t dev; 3169 Port_t iobase; 3170 int s; 3171 struct siocnstate sp; 3172 speed_t speed; 3173 3174 dev = cd->cn_dev; 3175 if (minor(dev) == siocnunit) { 3176 iobase = siocniobase; 3177 speed = comdefaultrate; 3178 } else { 3179 iobase = siogdbiobase; 3180 speed = gdbdefaultrate; 3181 } 3182 s = spltty(); 3183 siocnopen(&sp, iobase, speed); 3184 while (!(inb(iobase + com_lsr) & LSR_RXRDY)) 3185 ; 3186 c = inb(iobase + com_data); 3187 siocnclose(&sp, iobase); 3188 splx(s); 3189 return (c); 3190} 3191 3192static void 3193siocnputc(struct consdev *cd, int c) 3194{ 3195 int need_unlock; 3196 int s; 3197 dev_t dev; 3198 struct siocnstate sp; 3199 Port_t iobase; 3200 speed_t speed; 3201 3202 dev = cd->cn_dev; 3203 if (minor(dev) == siocnunit) { 3204 iobase = siocniobase; 3205 speed = comdefaultrate; 3206 } else { 3207 iobase = siogdbiobase; 3208 speed = gdbdefaultrate; 3209 } 3210 s = spltty(); 3211 need_unlock = 0; 3212 if (sio_inited == 2 && !mtx_owned(&sio_lock)) { 3213 mtx_lock_spin(&sio_lock); 3214 need_unlock = 1; 3215 } 3216 siocnopen(&sp, iobase, speed); 3217 siocntxwait(iobase); 3218 outb(iobase + com_data, c); 3219 siocnclose(&sp, iobase); 3220 if (need_unlock) 3221 mtx_unlock_spin(&sio_lock); 3222 splx(s); 3223} 3224 3225#ifdef __alpha__ 3226int 3227siogdbgetc() 3228{ 3229 int c; 3230 Port_t iobase; 3231 speed_t speed; 3232 int s; 3233 struct siocnstate sp; 3234 3235 if (siogdbunit == siocnunit) { 3236 iobase = siocniobase; 3237 speed = comdefaultrate; 3238 } else { 3239 iobase = siogdbiobase; 3240 speed = gdbdefaultrate; 3241 } 3242 3243 s = spltty(); 3244 siocnopen(&sp, iobase, speed); 3245 while (!(inb(iobase + com_lsr) & LSR_RXRDY)) 3246 ; 3247 c = inb(iobase + com_data); 3248 siocnclose(&sp, iobase); 3249 splx(s); 3250 return (c); 3251} 3252 3253void 3254siogdbputc(c) 3255 int c; 3256{ 3257 Port_t iobase; 3258 speed_t speed; 3259 int s; 3260 struct siocnstate sp; 3261 3262 if (siogdbunit == siocnunit) { 3263 iobase = siocniobase; 3264 speed = comdefaultrate; 3265 } else { 3266 iobase = siogdbiobase; 3267 speed = gdbdefaultrate; 3268 } 3269 3270 s = spltty(); 3271 siocnopen(&sp, iobase, speed); 3272 siocntxwait(siogdbiobase); 3273 outb(siogdbiobase + com_data, c); 3274 siocnclose(&sp, siogdbiobase); 3275 splx(s); 3276} 3277#endif 3278