com.c revision 1.33
1 /*- 2 * Copyright (c) 1993, 1994 Charles Hannum. 3 * Copyright (c) 1991 The Regents of the University of California. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by the University of 17 * California, Berkeley and its contributors. 18 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * from: @(#)com.c 7.5 (Berkeley) 5/16/91 35 * $Id: com.c,v 1.33 1994/08/07 11:27:51 mycroft Exp $ 36 */ 37 38 /* 39 * COM driver, based on HP dca driver 40 * uses National Semiconductor NS16450/NS16550AF UART 41 */ 42 #include "com.h" 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/ioctl.h> 47 #include <sys/select.h> 48 #include <sys/tty.h> 49 #include <sys/proc.h> 50 #include <sys/user.h> 51 #include <sys/conf.h> 52 #include <sys/file.h> 53 #include <sys/uio.h> 54 #include <sys/kernel.h> 55 #include <sys/syslog.h> 56 #include <sys/types.h> 57 #include <sys/device.h> 58 59 #include <machine/cpu.h> 60 #include <machine/pio.h> 61 62 #include <i386/isa/isavar.h> 63 #include <i386/isa/comreg.h> 64 #include <i386/isa/ic/ns16550.h> 65 66 struct com_softc { 67 struct device sc_dev; 68 struct intrhand sc_ih; 69 70 int sc_overflows; 71 u_short sc_iobase; 72 u_char sc_hwflags; 73 #define COM_HW_NOIEN 0x01 74 #define COM_HW_FIFO 0x02 75 #define COM_HW_CONSOLE 0x40 76 u_char sc_swflags; 77 #define COM_SW_SOFTCAR 0x01 78 #define COM_SW_CLOCAL 0x02 79 #define COM_SW_CRTSCTS 0x04 80 #define COM_SW_MDMBUF 0x08 81 u_char sc_msr, sc_mcr; 82 }; 83 /* XXXX should be in com_softc, but not ready for that yet */ 84 struct tty *com_tty[NCOM]; 85 86 int comprobe(); 87 void comattach(); 88 int comopen __P((dev_t, int, int, struct proc *)); 89 int comclose __P((dev_t, int, int, struct proc *)); 90 void comdiag __P((void *)); 91 int comintr __P((struct com_softc *)); 92 int comparam __P((struct tty *, struct termios *)); 93 void comstart __P((struct tty *)); 94 95 struct cfdriver comcd = { 96 NULL, "com", comprobe, comattach, DV_TTY, sizeof(struct com_softc) 97 }; 98 99 int comdefaultrate = TTYDEF_SPEED; 100 #ifdef COMCONSOLE 101 int comconsole = COMCONSOLE; 102 #else 103 int comconsole = -1; 104 #endif 105 int comconsinit; 106 int commajor; 107 108 #ifdef KGDB 109 #include <machine/remote-sl.h> 110 extern int kgdb_dev; 111 extern int kgdb_rate; 112 extern int kgdb_debug_init; 113 #endif 114 115 #define COMUNIT(x) (minor(x)) 116 117 #define bis(c, b) do { const register u_short com_ad = (c); \ 118 outb(com_ad, inb(com_ad) | (b)); } while(0) 119 #define bic(c, b) do { const register u_short com_ad = (c); \ 120 outb(com_ad, inb(com_ad) & ~(b)); } while(0) 121 122 int 123 comspeed(speed) 124 long speed; 125 { 126 #define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */ 127 128 int x, err; 129 130 if (speed == 0) 131 return 0; 132 if (speed < 0) 133 return -1; 134 x = divrnd((COM_FREQ / 16), speed); 135 if (x <= 0) 136 return -1; 137 err = divrnd((COM_FREQ / 16) * 1000, speed * x) - 1000; 138 if (err < 0) 139 err = -err; 140 if (err > COM_TOLERANCE) 141 return -1; 142 return x; 143 144 #undef divrnd(n, q) 145 } 146 147 int 148 comprobe1(iobase) 149 u_short iobase; 150 { 151 152 /* force access to id reg */ 153 outb(iobase + com_cfcr, 0); 154 outb(iobase + com_iir, 0); 155 if (inb(iobase + com_iir) & 0x38) 156 return 0; 157 158 return 1; 159 } 160 161 int 162 comprobe(parent, self, aux) 163 struct device *parent, *self; 164 void *aux; 165 { 166 struct com_softc *sc = (void *)self; 167 struct isa_attach_args *ia = aux; 168 u_short iobase = ia->ia_iobase; 169 170 if (!comprobe1(iobase)) 171 return 0; 172 173 ia->ia_iosize = COM_NPORTS; 174 ia->ia_msize = 0; 175 return 1; 176 } 177 178 void 179 comattach(parent, self, aux) 180 struct device *parent, *self; 181 void *aux; 182 { 183 struct com_softc *sc = (void *)self; 184 struct isa_attach_args *ia = aux; 185 struct cfdata *cf = sc->sc_dev.dv_cfdata; 186 u_short iobase = ia->ia_iobase; 187 struct tty *tp; 188 189 sc->sc_iobase = iobase; 190 sc->sc_hwflags = cf->cf_flags & COM_HW_NOIEN; 191 sc->sc_swflags = 0; 192 193 if (sc->sc_dev.dv_unit == comconsole) 194 delay(1000); 195 196 /* look for a NS 16550AF UART with FIFOs */ 197 outb(iobase + com_fifo, 198 FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_14); 199 delay(100); 200 if ((inb(iobase + com_iir) & IIR_FIFO_MASK) == IIR_FIFO_MASK) 201 if ((inb(iobase + com_fifo) & FIFO_TRIGGER_14) == FIFO_TRIGGER_14) { 202 sc->sc_hwflags |= COM_HW_FIFO; 203 printf(": ns16550a, working fifo\n"); 204 } else 205 printf(": ns82550 or ns16550, broken fifo\n"); 206 else 207 printf(": ns82450 or ns16450, no fifo\n"); 208 outb(iobase + com_fifo, 0); 209 210 /* disable interrupts */ 211 outb(iobase + com_ier, 0); 212 outb(iobase + com_mcr, 0); 213 214 if (!parent) { /* XXX no master */ 215 sc->sc_ih.ih_fun = comintr; 216 sc->sc_ih.ih_arg = sc; 217 sc->sc_ih.ih_level = IPL_TTY; 218 intr_establish(ia->ia_irq, &sc->sc_ih); 219 } 220 221 #ifdef KGDB 222 if (kgdb_dev == makedev(commajor, unit)) { 223 if (comconsole == unit) 224 kgdb_dev = -1; /* can't debug over console port */ 225 else { 226 (void) cominit(unit, kgdb_rate); 227 if (kgdb_debug_init) { 228 /* 229 * Print prefix of device name, 230 * let kgdb_connect print the rest. 231 */ 232 printf("%s: ", sc->sc_dev.dv_xname); 233 kgdb_connect(1); 234 } else 235 printf("%s: kgdb enabled\n", 236 sc->sc_dev.dv_xname); 237 } 238 } 239 #endif 240 241 if (sc->sc_dev.dv_unit == comconsole) { 242 /* 243 * Need to reset baud rate, etc. of next print so reset 244 * comconsinit. Also make sure console is always "hardwired". 245 */ 246 comconsinit = 0; 247 sc->sc_hwflags |= COM_HW_CONSOLE; 248 sc->sc_swflags |= COM_SW_SOFTCAR; 249 } 250 } 251 252 int 253 comopen(dev, flag, mode, p) 254 dev_t dev; 255 int flag, mode; 256 struct proc *p; 257 { 258 int unit = COMUNIT(dev); 259 struct com_softc *sc; 260 u_short iobase; 261 struct tty *tp; 262 int s; 263 int error = 0; 264 265 if (unit >= comcd.cd_ndevs) 266 return ENXIO; 267 sc = comcd.cd_devs[unit]; 268 if (!sc) 269 return ENXIO; 270 271 s = spltty(); 272 273 if (!com_tty[unit]) 274 tp = com_tty[unit] = ttymalloc(); 275 else 276 tp = com_tty[unit]; 277 278 tp->t_oproc = comstart; 279 tp->t_param = comparam; 280 tp->t_dev = dev; 281 if ((tp->t_state & TS_ISOPEN) == 0) { 282 tp->t_state |= TS_WOPEN; 283 ttychars(tp); 284 tp->t_iflag = TTYDEF_IFLAG; 285 tp->t_oflag = TTYDEF_OFLAG; 286 tp->t_cflag = TTYDEF_CFLAG; 287 if (sc->sc_swflags & COM_SW_CLOCAL) 288 tp->t_cflag |= CLOCAL; 289 if (sc->sc_swflags & COM_SW_CRTSCTS) 290 tp->t_cflag |= CRTSCTS; 291 if (sc->sc_swflags & COM_SW_MDMBUF) 292 tp->t_cflag |= MDMBUF; 293 tp->t_lflag = TTYDEF_LFLAG; 294 tp->t_ispeed = tp->t_ospeed = comdefaultrate; 295 comparam(tp, &tp->t_termios); 296 ttsetwater(tp); 297 298 iobase = sc->sc_iobase; 299 /* flush any pending I/O */ 300 if (sc->sc_hwflags & COM_HW_FIFO) 301 outb(iobase + com_fifo, 302 FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | 303 FIFO_TRIGGER_8); 304 (void) inb(iobase + com_lsr); 305 (void) inb(iobase + com_data); 306 /* you turn me on, baby */ 307 sc->sc_mcr = MCR_DTR | MCR_RTS; 308 if (!(sc->sc_hwflags & COM_HW_NOIEN)) 309 sc->sc_mcr |= MCR_IENABLE; 310 outb(iobase + com_mcr, sc->sc_mcr); 311 outb(iobase + com_ier, 312 IER_ERXRDY | IER_ETXRDY | IER_ERLS | IER_EMSC); 313 314 sc->sc_msr = inb(iobase + com_msr); 315 if (sc->sc_swflags & COM_SW_SOFTCAR || sc->sc_msr & MSR_DCD || 316 tp->t_lflag&MDMBUF) 317 tp->t_state |= TS_CARR_ON; 318 else 319 tp->t_state &= ~TS_CARR_ON; 320 } else if (tp->t_state&TS_XCLUDE && p->p_ucred->cr_uid != 0) { 321 splx(s); 322 return EBUSY; 323 } 324 325 /* wait for carrier if necessary */ 326 if ((flag & O_NONBLOCK) == 0) 327 while ((tp->t_cflag & CLOCAL) == 0 && 328 (tp->t_state & TS_CARR_ON) == 0) { 329 tp->t_state |= TS_WOPEN; 330 error = ttysleep(tp, (caddr_t)&tp->t_rawq, 331 TTIPRI | PCATCH, ttopen, 0); 332 if (error) { 333 /* XXX should turn off chip if we're the 334 only waiter */ 335 splx(s); 336 return error; 337 } 338 } 339 splx(s); 340 341 return (*linesw[tp->t_line].l_open)(dev, tp); 342 } 343 344 int 345 comclose(dev, flag, mode, p) 346 dev_t dev; 347 int flag, mode; 348 struct proc *p; 349 { 350 int unit = COMUNIT(dev); 351 struct com_softc *sc = comcd.cd_devs[unit]; 352 u_short iobase = sc->sc_iobase; 353 struct tty *tp = com_tty[unit]; 354 355 (*linesw[tp->t_line].l_close)(tp, flag); 356 #ifdef KGDB 357 /* do not disable interrupts if debugging */ 358 if (kgdb_dev != makedev(commajor, unit)) 359 #endif 360 { 361 bic(iobase + com_cfcr, CFCR_SBREAK); 362 outb(iobase + com_ier, 0); 363 if (tp->t_cflag & HUPCL && 364 (sc->sc_swflags & COM_SW_SOFTCAR) == 0) 365 /* XXX perhaps only clear DTR */ 366 outb(iobase + com_mcr, 0); 367 } 368 ttyclose(tp); 369 #ifdef notyet /* XXXX */ 370 if (unit != comconsole) { 371 ttyfree(tp); 372 com_tty[unit] = (struct tty *)NULL; 373 } 374 #endif 375 return 0; 376 } 377 378 int 379 comread(dev, uio, flag) 380 dev_t dev; 381 struct uio *uio; 382 int flag; 383 { 384 struct tty *tp = com_tty[COMUNIT(dev)]; 385 386 return ((*linesw[tp->t_line].l_read)(tp, uio, flag)); 387 } 388 389 int 390 comwrite(dev, uio, flag) 391 dev_t dev; 392 struct uio *uio; 393 int flag; 394 { 395 struct tty *tp = com_tty[COMUNIT(dev)]; 396 397 return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 398 } 399 400 static u_char 401 tiocm_xxx2mcr(data) 402 int data; 403 { 404 u_char m = 0; 405 406 if (data & TIOCM_DTR) 407 m |= MCR_DTR; 408 if (data & TIOCM_RTS) 409 m |= MCR_RTS; 410 return m; 411 } 412 413 int 414 comioctl(dev, cmd, data, flag, p) 415 dev_t dev; 416 int cmd; 417 caddr_t data; 418 int flag; 419 struct proc *p; 420 { 421 int unit = COMUNIT(dev); 422 struct com_softc *sc = comcd.cd_devs[unit]; 423 u_short iobase = sc->sc_iobase; 424 struct tty *tp = com_tty[unit]; 425 int error; 426 427 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); 428 if (error >= 0) 429 return error; 430 error = ttioctl(tp, cmd, data, flag, p); 431 if (error >= 0) 432 return error; 433 434 switch (cmd) { 435 case TIOCSBRK: 436 bis(iobase + com_cfcr, CFCR_SBREAK); 437 break; 438 case TIOCCBRK: 439 bic(iobase + com_cfcr, CFCR_SBREAK); 440 break; 441 case TIOCSDTR: 442 outb(iobase + com_mcr, sc->sc_mcr |= (MCR_DTR | MCR_RTS)); 443 break; 444 case TIOCCDTR: 445 outb(iobase + com_mcr, sc->sc_mcr &= ~(MCR_DTR | MCR_RTS)); 446 break; 447 case TIOCMSET: 448 sc->sc_mcr &= ~(MCR_DTR | MCR_RTS); 449 case TIOCMBIS: 450 outb(iobase + com_mcr, 451 sc->sc_mcr |= tiocm_xxx2mcr(*(int *)data)); 452 break; 453 case TIOCMBIC: 454 outb(iobase + com_mcr, 455 sc->sc_mcr &= ~tiocm_xxx2mcr(*(int *)data)); 456 break; 457 case TIOCMGET: { 458 u_char m; 459 int bits = 0; 460 461 m = sc->sc_mcr; 462 if (m & MCR_DTR) 463 bits |= TIOCM_DTR; 464 if (m & MCR_RTS) 465 bits |= TIOCM_RTS; 466 m = sc->sc_msr; 467 if (m & MSR_DCD) 468 bits |= TIOCM_CD; 469 if (m & MSR_CTS) 470 bits |= TIOCM_CTS; 471 if (m & MSR_DSR) 472 bits |= TIOCM_DSR; 473 if (m & (MSR_RI | MSR_TERI)) 474 bits |= TIOCM_RI; 475 if (inb(iobase + com_ier)) 476 bits |= TIOCM_LE; 477 *(int *)data = bits; 478 break; 479 } 480 case TIOCGFLAGS: { 481 int bits = 0; 482 483 if (sc->sc_swflags & COM_SW_SOFTCAR) 484 bits |= TIOCFLAG_SOFTCAR; 485 if (sc->sc_swflags & COM_SW_CLOCAL) 486 bits |= TIOCFLAG_CLOCAL; 487 if (sc->sc_swflags & COM_SW_CRTSCTS) 488 bits |= TIOCFLAG_CRTSCTS; 489 if (sc->sc_swflags & COM_SW_MDMBUF) 490 bits |= TIOCFLAG_MDMBUF; 491 492 *(int *)data = bits; 493 break; 494 } 495 case TIOCSFLAGS: { 496 int userbits, driverbits = 0; 497 498 error = suser(p->p_ucred, &p->p_acflag); 499 if (error != 0) 500 return(EPERM); 501 502 userbits = *(int *)data; 503 if ((userbits & TIOCFLAG_SOFTCAR) || 504 (sc->sc_hwflags & COM_HW_CONSOLE)) 505 driverbits |= COM_SW_SOFTCAR; 506 if (userbits & TIOCFLAG_CLOCAL) 507 driverbits |= COM_SW_CLOCAL; 508 if (userbits & TIOCFLAG_CRTSCTS) 509 driverbits |= COM_SW_CRTSCTS; 510 if (userbits & TIOCFLAG_MDMBUF) 511 driverbits |= COM_SW_MDMBUF; 512 513 sc->sc_swflags = driverbits; 514 break; 515 } 516 default: 517 return ENOTTY; 518 } 519 520 return 0; 521 } 522 523 int 524 comparam(tp, t) 525 struct tty *tp; 526 struct termios *t; 527 { 528 struct com_softc *sc = comcd.cd_devs[COMUNIT(tp->t_dev)]; 529 u_short iobase = sc->sc_iobase; 530 int ospeed = comspeed(t->c_ospeed); 531 u_char cfcr; 532 int s; 533 534 /* check requested parameters */ 535 if (ospeed < 0 || (t->c_ispeed && t->c_ispeed != t->c_ospeed)) 536 return EINVAL; 537 538 switch (t->c_cflag & CSIZE) { 539 case CS5: 540 cfcr = CFCR_5BITS; 541 break; 542 case CS6: 543 cfcr = CFCR_6BITS; 544 break; 545 case CS7: 546 cfcr = CFCR_7BITS; 547 break; 548 case CS8: 549 cfcr = CFCR_8BITS; 550 break; 551 } 552 if (t->c_cflag & PARENB) { 553 cfcr |= CFCR_PENAB; 554 if ((t->c_cflag & PARODD) == 0) 555 cfcr |= CFCR_PEVEN; 556 } 557 if (t->c_cflag & CSTOPB) 558 cfcr |= CFCR_STOPB; 559 560 s = spltty(); 561 562 if (ospeed == 0) 563 outb(iobase + com_mcr, sc->sc_mcr &= ~MCR_DTR); 564 else 565 outb(iobase + com_mcr, sc->sc_mcr |= MCR_DTR); 566 567 outb(iobase + com_cfcr, cfcr | CFCR_DLAB); 568 outb(iobase + com_dlbl, ospeed); 569 outb(iobase + com_dlbh, ospeed>>8); 570 outb(iobase + com_cfcr, cfcr); 571 572 /* When not using CRTSCTS, RTS follows DTR. */ 573 if ((t->c_cflag & CRTSCTS) == 0) { 574 if (sc->sc_mcr & MCR_DTR) { 575 if ((sc->sc_mcr & MCR_RTS) == 0) 576 outb(iobase + com_mcr, sc->sc_mcr |= MCR_RTS); 577 } else { 578 if (sc->sc_mcr & MCR_RTS) 579 outb(iobase + com_mcr, sc->sc_mcr &= ~MCR_RTS); 580 } 581 } 582 583 /* 584 * If CTS is off and CRTSCTS is changed, we must toggle TS_TTSTOP. 585 * XXX should be done at tty layer. 586 */ 587 if ((sc->sc_msr & MSR_CTS) == 0 && 588 (tp->t_cflag & CRTSCTS) != (t->c_cflag & CRTSCTS)) { 589 if ((t->c_cflag & CRTSCTS) == 0) { 590 tp->t_state &= ~TS_TTSTOP; 591 (*linesw[tp->t_line].l_start)(tp); 592 } else 593 tp->t_state |= TS_TTSTOP; 594 } 595 596 /* 597 * If DCD is off and MDMBUF is changed, we must toggle TS_TTSTOP. 598 * XXX should be done at tty layer. 599 */ 600 if ((sc->sc_swflags & COM_SW_SOFTCAR) == 0 && 601 (sc->sc_msr & MSR_DCD) == 0 && 602 (tp->t_cflag & MDMBUF) != (t->c_cflag & MDMBUF)) { 603 if ((t->c_cflag & MDMBUF) == 0) { 604 tp->t_state &= ~TS_TTSTOP; 605 (*linesw[tp->t_line].l_start)(tp); 606 } else 607 tp->t_state |= TS_TTSTOP; 608 } 609 610 /* and copy to tty */ 611 tp->t_ispeed = t->c_ispeed; 612 tp->t_ospeed = t->c_ospeed; 613 tp->t_cflag = t->c_cflag; 614 615 splx(s); 616 return 0; 617 } 618 619 void 620 comstart(tp) 621 struct tty *tp; 622 { 623 struct com_softc *sc = comcd.cd_devs[COMUNIT(tp->t_dev)]; 624 u_short iobase = sc->sc_iobase; 625 int s; 626 627 s = spltty(); 628 if (tp->t_state & (TS_TTSTOP | TS_BUSY)) 629 goto out; 630 #if 0 /* XXXX I think this is handled adequately by commint() and comparam(). */ 631 if (tp->t_cflag & CRTSCTS && (sc->sc_mcr & MSR_CTS) == 0) 632 goto out; 633 #endif 634 if (tp->t_outq.c_cc <= tp->t_lowat) { 635 if (tp->t_state & TS_ASLEEP) { 636 tp->t_state &= ~TS_ASLEEP; 637 wakeup((caddr_t)&tp->t_outq); 638 } 639 selwakeup(&tp->t_wsel); 640 } 641 if (tp->t_outq.c_cc == 0) 642 goto out; 643 tp->t_state |= TS_BUSY; 644 if ((inb(iobase + com_lsr) & LSR_TXRDY) == 0) 645 goto out; 646 if (sc->sc_hwflags & COM_HW_FIFO) { 647 u_char buffer[16], *cp = buffer; 648 int n = q_to_b(&tp->t_outq, cp, sizeof buffer); 649 do { 650 outb(iobase + com_data, *cp++); 651 } while (--n); 652 } else 653 outb(iobase + com_data, getc(&tp->t_outq)); 654 out: 655 splx(s); 656 } 657 658 /* 659 * Stop output on a line. 660 */ 661 void 662 comstop(tp, flag) 663 struct tty *tp; 664 { 665 int s; 666 667 s = spltty(); 668 if (tp->t_state & TS_BUSY) 669 if ((tp->t_state & TS_TTSTOP) == 0) 670 tp->t_state |= TS_FLUSH; 671 splx(s); 672 } 673 674 static inline void 675 comeint(sc, stat) 676 struct com_softc *sc; 677 int stat; 678 { 679 u_short iobase = sc->sc_iobase; 680 int unit = sc->sc_dev.dv_unit; 681 struct tty *tp = com_tty[unit]; 682 int c; 683 684 c = inb(iobase + com_data); 685 if ((tp->t_state & TS_ISOPEN) == 0) { 686 #ifdef KGDB 687 /* we don't care about parity errors */ 688 if (((stat & (LSR_BI | LSR_FE | LSR_PE)) == LSR_PE) && 689 kgdb_dev == makedev(commajor, unit) && c == FRAME_END) 690 kgdb_connect(0); /* trap into kgdb */ 691 #endif 692 return; 693 } 694 if (stat & (LSR_BI | LSR_FE)) 695 c |= TTY_FE; 696 else if (stat & LSR_PE) 697 c |= TTY_PE; 698 if (stat & LSR_OE) { 699 if (sc->sc_overflows++ == 0) 700 timeout(comdiag, sc, 60 * hz); 701 } 702 /* XXXX put in FIFO and process later */ 703 (*linesw[tp->t_line].l_rint)(c, tp); 704 } 705 706 static inline void 707 commint(sc) 708 struct com_softc *sc; 709 { 710 u_short iobase = sc->sc_iobase; 711 struct tty *tp = com_tty[sc->sc_dev.dv_unit]; 712 u_char msr, delta; 713 714 msr = inb(iobase + com_msr); 715 delta = msr ^ sc->sc_msr; 716 sc->sc_msr = msr; 717 718 if (delta & MSR_DCD && (sc->sc_swflags & COM_SW_SOFTCAR) == 0) { 719 if (msr & MSR_DCD) 720 (void)(*linesw[tp->t_line].l_modem)(tp, 1); 721 else if ((*linesw[tp->t_line].l_modem)(tp, 0) == 0) 722 outb(iobase + com_mcr, 723 sc->sc_mcr &= ~(MCR_DTR | MCR_RTS)); 724 } 725 if (delta & MSR_CTS && tp->t_cflag & CRTSCTS) { 726 /* the line is up and we want to do rts/cts flow control */ 727 if (msr & MSR_CTS) { 728 tp->t_state &= ~TS_TTSTOP; 729 (*linesw[tp->t_line].l_start)(tp); 730 } else 731 tp->t_state |= TS_TTSTOP; 732 } 733 } 734 735 void 736 comdiag(arg) 737 void *arg; 738 { 739 struct com_softc *sc = arg; 740 int overflows; 741 int s; 742 743 s = spltty(); 744 overflows = sc->sc_overflows; 745 sc->sc_overflows = 0; 746 splx(s); 747 748 if (overflows) 749 log(LOG_WARNING, "%s: %d silo overflow%s\n", 750 sc->sc_dev.dv_xname, overflows, overflows == 1 ? "" : "s"); 751 } 752 753 int 754 comintr(sc) 755 struct com_softc *sc; 756 { 757 u_short iobase = sc->sc_iobase; 758 struct tty *tp; 759 u_char code; 760 761 code = inb(iobase + com_iir) & IIR_IMASK; 762 if (code & IIR_NOPEND) 763 return 0; 764 765 for (;;) { 766 if (code & IIR_RXRDY) { 767 tp = com_tty[sc->sc_dev.dv_unit]; 768 /* XXXX put in FIFO and process later */ 769 while (code = (inb(iobase + com_lsr) & LSR_RCV_MASK)) { 770 if (code == LSR_RXRDY) { 771 code = inb(iobase + com_data); 772 if (tp->t_state & TS_ISOPEN) 773 (*linesw[tp->t_line].l_rint)(code, tp); 774 #ifdef KGDB 775 else { 776 if (kgdb_dev == makedev(commajor, unit) && 777 code == FRAME_END) 778 kgdb_connect(0); 779 } 780 #endif 781 } else 782 comeint(sc, code); 783 } 784 } else if (code == IIR_TXRDY) { 785 tp = com_tty[sc->sc_dev.dv_unit]; 786 tp->t_state &= ~TS_BUSY; 787 if (tp->t_state & TS_FLUSH) 788 tp->t_state &= ~TS_FLUSH; 789 else 790 if (tp->t_line) 791 (*linesw[tp->t_line].l_start)(tp); 792 else 793 comstart(tp); 794 } else if (code == IIR_MLSC) { 795 commint(sc); 796 } else { 797 log(LOG_WARNING, "%s: weird interrupt: iir=0x%02x\n", 798 sc->sc_dev.dv_xname, code); 799 } 800 code = inb(iobase + com_iir) & IIR_IMASK; 801 if (code & IIR_NOPEND) 802 return 1; 803 } 804 } 805 806 /* 807 * Following are all routines needed for COM to act as console 808 */ 809 #include <dev/cons.h> 810 811 comcnprobe(cp) 812 struct consdev *cp; 813 { 814 815 if (!comprobe1(CONADDR)) { 816 cp->cn_pri = CN_DEAD; 817 return; 818 } 819 820 /* locate the major number */ 821 for (commajor = 0; commajor < nchrdev; commajor++) 822 if (cdevsw[commajor].d_open == comopen) 823 break; 824 825 /* initialize required fields */ 826 cp->cn_dev = makedev(commajor, CONUNIT); 827 #ifdef COMCONSOLE 828 cp->cn_pri = CN_REMOTE; /* Force a serial port console */ 829 #else 830 cp->cn_pri = CN_NORMAL; 831 #endif 832 } 833 834 comcninit(cp) 835 struct consdev *cp; 836 { 837 838 cominit(CONUNIT, comdefaultrate); 839 comconsole = CONUNIT; 840 comconsinit = 0; 841 } 842 843 cominit(unit, rate) 844 int unit, rate; 845 { 846 int s = splhigh(); 847 u_short iobase = CONADDR; 848 u_char stat; 849 850 outb(iobase + com_cfcr, CFCR_DLAB); 851 rate = comspeed(comdefaultrate); 852 outb(iobase + com_dlbl, rate); 853 outb(iobase + com_dlbh, rate >> 8); 854 outb(iobase + com_cfcr, CFCR_8BITS); 855 outb(iobase + com_ier, IER_ERXRDY | IER_ETXRDY); 856 outb(iobase + com_fifo, FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_4); 857 stat = inb(iobase + com_iir); 858 splx(s); 859 } 860 861 comcngetc(dev) 862 dev_t dev; 863 { 864 int s = splhigh(); 865 u_short iobase = CONADDR; 866 u_char stat, c; 867 868 while (((stat = inb(iobase + com_lsr)) & LSR_RXRDY) == 0) 869 ; 870 c = inb(iobase + com_data); 871 stat = inb(iobase + com_iir); 872 splx(s); 873 return c; 874 } 875 876 /* 877 * Console kernel output character routine. 878 */ 879 comcnputc(dev, c) 880 dev_t dev; 881 int c; 882 { 883 int s = splhigh(); 884 u_short iobase = CONADDR; 885 u_char stat; 886 register int timo; 887 888 #ifdef KGDB 889 if (dev != kgdb_dev) 890 #endif 891 if (comconsinit == 0) { 892 (void) cominit(COMUNIT(dev), comdefaultrate); 893 comconsinit = 1; 894 } 895 /* wait for any pending transmission to finish */ 896 timo = 50000; 897 while (((stat = inb(iobase + com_lsr)) & LSR_TXRDY) == 0 && --timo) 898 ; 899 outb(iobase + com_data, c); 900 /* wait for this transmission to complete */ 901 timo = 1500000; 902 while (((stat = inb(iobase + com_lsr)) & LSR_TXRDY) == 0 && --timo) 903 ; 904 /* clear any interrupts generated by this transmission */ 905 stat = inb(iobase + com_iir); 906 splx(s); 907 } 908
Indexes created Fri Sep 26 08:10:20 GMT 2025