com.c revision 1.72
1 /* $NetBSD: com.c,v 1.72 1996/02/20 12:13:09 mycroft Exp $ */ 2 3 /*- 4 * Copyright (c) 1993, 1994, 1995, 1996 5 * Charles M. Hannum. All rights reserved. 6 * Copyright (c) 1991 The Regents of the University of California. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the University of 20 * California, Berkeley and its contributors. 21 * 4. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * @(#)com.c 7.5 (Berkeley) 5/16/91 38 */ 39 40 /* 41 * COM driver, based on HP dca driver 42 * uses National Semiconductor NS16450/NS16550AF UART 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 <dev/isa/isavar.h> 63 #include <dev/isa/comreg.h> 64 #include <dev/ic/ns16550reg.h> 65 #ifdef COM_HAYESP 66 #include <dev/ic/hayespreg.h> 67 #endif 68 #define com_lcr com_cfcr 69 70 #define COM_IBUFSIZE (2 * 512) 71 #define COM_IHIGHWATER ((3 * COM_IBUFSIZE) / 4) 72 73 struct com_softc { 74 struct device sc_dev; 75 void *sc_ih; 76 struct tty *sc_tty; 77 78 int sc_overflows; 79 int sc_floods; 80 int sc_errors; 81 82 int sc_halt; 83 84 int sc_iobase; 85 #ifdef COM_HAYESP 86 int sc_hayespbase; 87 #endif 88 u_char sc_hwflags; 89 #define COM_HW_NOIEN 0x01 90 #define COM_HW_FIFO 0x02 91 #define COM_HW_HAYESP 0x04 92 #define COM_HW_CONSOLE 0x40 93 u_char sc_swflags; 94 #define COM_SW_SOFTCAR 0x01 95 #define COM_SW_CLOCAL 0x02 96 #define COM_SW_CRTSCTS 0x04 97 #define COM_SW_MDMBUF 0x08 98 u_char sc_msr, sc_mcr, sc_lcr, sc_ier; 99 u_char sc_dtr; 100 101 u_char *sc_ibuf, *sc_ibufp, *sc_ibufhigh, *sc_ibufend; 102 u_char sc_ibufs[2][COM_IBUFSIZE]; 103 }; 104 105 int comprobe __P((struct device *, void *, void *)); 106 void comattach __P((struct device *, struct device *, void *)); 107 int comopen __P((dev_t, int, int, struct proc *)); 108 int comclose __P((dev_t, int, int, struct proc *)); 109 void comdiag __P((void *)); 110 int comintr __P((void *)); 111 void compoll __P((void *)); 112 int comparam __P((struct tty *, struct termios *)); 113 void comstart __P((struct tty *)); 114 115 struct cfdriver comcd = { 116 NULL, "com", comprobe, comattach, DV_TTY, sizeof(struct com_softc) 117 }; 118 119 #ifdef COMCONSOLE 120 int comdefaultrate = CONSPEED; 121 int comconsole = COMCONSOLE; 122 #else 123 int comdefaultrate = TTYDEF_SPEED; 124 int comconsole = -1; 125 #endif 126 int comconsinit; 127 int commajor; 128 int comsopen = 0; 129 int comevents = 0; 130 131 #ifdef KGDB 132 #include <machine/remote-sl.h> 133 extern int kgdb_dev; 134 extern int kgdb_rate; 135 extern int kgdb_debug_init; 136 #endif 137 138 #define COMUNIT(x) (minor(x)) 139 140 /* Macros to clear/set/test flags. */ 141 #define SET(t, f) (t) |= (f) 142 #define CLR(t, f) (t) &= ~(f) 143 #define ISSET(t, f) ((t) & (f)) 144 145 int 146 comspeed(speed) 147 long speed; 148 { 149 #define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */ 150 151 int x, err; 152 153 if (speed == 0) 154 return 0; 155 if (speed < 0) 156 return -1; 157 x = divrnd((COM_FREQ / 16), speed); 158 if (x <= 0) 159 return -1; 160 err = divrnd((COM_FREQ / 16) * 1000, speed * x) - 1000; 161 if (err < 0) 162 err = -err; 163 if (err > COM_TOLERANCE) 164 return -1; 165 return x; 166 167 #undef divrnd(n, q) 168 } 169 170 int 171 comprobe1(iobase) 172 int iobase; 173 { 174 175 /* force access to id reg */ 176 outb(iobase + com_lcr, 0); 177 outb(iobase + com_iir, 0); 178 if (inb(iobase + com_iir) & 0x38) 179 return 0; 180 181 return 1; 182 } 183 184 #ifdef COM_HAYESP 185 int 186 comprobeHAYESP(iobase, sc) 187 int iobase; 188 struct com_softc *sc; 189 { 190 char val, dips; 191 int combaselist[] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8 }; 192 193 /* 194 * Hayes ESP cards have two iobases. One is for compatibility with 195 * 16550 serial chips, and at the same ISA PC base addresses. The 196 * other is for ESP-specific enhanced features, and lies at a 197 * different addressing range entirely (0x140, 0x180, 0x280, or 0x300). 198 */ 199 200 /* Test for ESP signature */ 201 if ((inb(iobase) & 0xf3) == 0) 202 return 0; 203 204 /* 205 * ESP is present at ESP enhanced base address; unknown com port 206 */ 207 208 /* Get the dip-switch configurations */ 209 outb(iobase + HAYESP_CMD1, HAYESP_GETDIPS); 210 dips = inb(iobase + HAYESP_STATUS1); 211 212 /* Determine which com port this ESP card services: bits 0,1 of */ 213 /* dips is the port # (0-3); combaselist[val] is the com_iobase */ 214 if (sc->sc_iobase != combaselist[dips & 0x03]) 215 return 0; 216 217 printf(": ESP"); 218 219 /* Check ESP Self Test bits. */ 220 /* Check for ESP version 2.0: bits 4,5,6 == 010 */ 221 outb(iobase + HAYESP_CMD1, HAYESP_GETTEST); 222 val = inb(iobase + HAYESP_STATUS1); /* Clear reg 1 */ 223 val = inb(iobase + HAYESP_STATUS2); 224 if ((val & 0x70) < 0x20) { 225 printf("-old (%o)", val & 0x70); 226 /* we do not support the necessary features */ 227 return 0; 228 } 229 230 /* Check for ability to emulate 16550: bit 8 == 1 */ 231 if ((dips & 0x80) == 0) { 232 printf(" slave"); 233 /* XXX Does slave really mean no 16550 support?? */ 234 return 0; 235 } 236 237 /* 238 * If we made it this far, we are a full-featured ESP v2.0 (or 239 * better), at the correct com port address. 240 */ 241 242 SET(sc->sc_hwflags, COM_HW_HAYESP); 243 printf(", 1024k fifo\n"); 244 return 1; 245 } 246 #endif 247 248 int 249 comprobe(parent, match, aux) 250 struct device *parent; 251 void *match, *aux; 252 { 253 struct isa_attach_args *ia = aux; 254 int iobase = ia->ia_iobase; 255 256 if (!comprobe1(iobase)) 257 return 0; 258 259 ia->ia_iosize = COM_NPORTS; 260 ia->ia_msize = 0; 261 return 1; 262 } 263 264 void 265 comattach(parent, self, aux) 266 struct device *parent, *self; 267 void *aux; 268 { 269 struct com_softc *sc = (void *)self; 270 struct isa_attach_args *ia = aux; 271 struct cfdata *cf = sc->sc_dev.dv_cfdata; 272 int iobase = ia->ia_iobase; 273 struct tty *tp; 274 #ifdef COM_HAYESP 275 int hayesp_ports[] = { 0x140, 0x180, 0x280, 0x300, 0 }; 276 int *hayespp; 277 #endif 278 279 sc->sc_iobase = iobase; 280 sc->sc_hwflags = ISSET(cf->cf_flags, COM_HW_NOIEN); 281 sc->sc_swflags = 0; 282 283 if (sc->sc_dev.dv_unit == comconsole) 284 delay(1000); 285 286 #ifdef COM_HAYESP 287 /* Look for a Hayes ESP board. */ 288 for (hayespp = hayesp_ports; *hayespp != 0; hayespp++) 289 if (comprobeHAYESP(*hayespp, sc)) { 290 sc->sc_hayespbase = *hayespp; 291 break; 292 } 293 /* No ESP; look for other things. */ 294 if (*hayespp == 0) { 295 #endif 296 297 /* look for a NS 16550AF UART with FIFOs */ 298 outb(iobase + com_fifo, 299 FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_14); 300 delay(100); 301 if (ISSET(inb(iobase + com_iir), IIR_FIFO_MASK) == IIR_FIFO_MASK) 302 if (ISSET(inb(iobase + com_fifo), FIFO_TRIGGER_14) == FIFO_TRIGGER_14) { 303 SET(sc->sc_hwflags, COM_HW_FIFO); 304 printf(": ns16550a, working fifo\n"); 305 } else 306 printf(": ns16550, broken fifo\n"); 307 else 308 printf(": ns8250 or ns16450, no fifo\n"); 309 outb(iobase + com_fifo, 0); 310 #ifdef COM_HAYESP 311 } 312 #endif 313 314 /* disable interrupts */ 315 outb(iobase + com_ier, 0); 316 outb(iobase + com_mcr, 0); 317 318 if (ia->ia_irq != IRQUNK) 319 sc->sc_ih = isa_intr_establish(ia->ia_irq, IST_EDGE, IPL_TTY, 320 comintr, sc); 321 322 #ifdef KGDB 323 if (kgdb_dev == makedev(commajor, unit)) { 324 if (comconsole == unit) 325 kgdb_dev = -1; /* can't debug over console port */ 326 else { 327 (void) cominit(unit, kgdb_rate); 328 if (kgdb_debug_init) { 329 /* 330 * Print prefix of device name, 331 * let kgdb_connect print the rest. 332 */ 333 printf("%s: ", sc->sc_dev.dv_xname); 334 kgdb_connect(1); 335 } else 336 printf("%s: kgdb enabled\n", 337 sc->sc_dev.dv_xname); 338 } 339 } 340 #endif 341 342 if (sc->sc_dev.dv_unit == comconsole) { 343 /* 344 * Need to reset baud rate, etc. of next print so reset 345 * comconsinit. Also make sure console is always "hardwired". 346 */ 347 comconsinit = 0; 348 SET(sc->sc_hwflags, COM_HW_CONSOLE); 349 SET(sc->sc_swflags, COM_SW_SOFTCAR); 350 } 351 } 352 353 int 354 comopen(dev, flag, mode, p) 355 dev_t dev; 356 int flag, mode; 357 struct proc *p; 358 { 359 int unit = COMUNIT(dev); 360 struct com_softc *sc; 361 int iobase; 362 struct tty *tp; 363 int s; 364 int error = 0; 365 366 if (unit >= comcd.cd_ndevs) 367 return ENXIO; 368 sc = comcd.cd_devs[unit]; 369 if (!sc) 370 return ENXIO; 371 372 if (!sc->sc_tty) 373 tp = sc->sc_tty = ttymalloc(); 374 else 375 tp = sc->sc_tty; 376 377 tp->t_oproc = comstart; 378 tp->t_param = comparam; 379 tp->t_dev = dev; 380 if (!ISSET(tp->t_state, TS_ISOPEN)) { 381 SET(tp->t_state, TS_WOPEN); 382 ttychars(tp); 383 tp->t_iflag = TTYDEF_IFLAG; 384 tp->t_oflag = TTYDEF_OFLAG; 385 tp->t_cflag = TTYDEF_CFLAG; 386 if (ISSET(sc->sc_swflags, COM_SW_CLOCAL)) 387 SET(tp->t_cflag, CLOCAL); 388 if (ISSET(sc->sc_swflags, COM_SW_CRTSCTS)) 389 SET(tp->t_cflag, CRTSCTS); 390 if (ISSET(sc->sc_swflags, COM_SW_MDMBUF)) 391 SET(tp->t_cflag, MDMBUF); 392 tp->t_lflag = TTYDEF_LFLAG; 393 tp->t_ispeed = tp->t_ospeed = comdefaultrate; 394 395 s = spltty(); 396 397 comparam(tp, &tp->t_termios); 398 ttsetwater(tp); 399 400 if (comsopen++ == 0) 401 timeout(compoll, NULL, 1); 402 403 sc->sc_ibufp = sc->sc_ibuf = sc->sc_ibufs[0]; 404 sc->sc_ibufhigh = sc->sc_ibuf + COM_IHIGHWATER; 405 sc->sc_ibufend = sc->sc_ibuf + COM_IBUFSIZE; 406 407 iobase = sc->sc_iobase; 408 #ifdef COM_HAYESP 409 /* Setup the ESP board */ 410 if (ISSET(sc->sc_hwflags, COM_HW_HAYESP)) { 411 int hayespbase = sc->sc_hayespbase; 412 413 outb(iobase + com_fifo, 414 FIFO_DMA_MODE|FIFO_ENABLE| 415 FIFO_RCV_RST|FIFO_XMT_RST|FIFO_TRIGGER_8); 416 417 /* Set 16550 compatibility mode */ 418 outb(hayespbase + HAYESP_CMD1, HAYESP_SETMODE); 419 outb(hayespbase + HAYESP_CMD2, 420 HAYESP_MODE_FIFO|HAYESP_MODE_RTS| 421 HAYESP_MODE_SCALE); 422 423 /* Set RTS/CTS flow control */ 424 outb(hayespbase + HAYESP_CMD1, HAYESP_SETFLOWTYPE); 425 outb(hayespbase + HAYESP_CMD2, HAYESP_FLOW_RTS); 426 outb(hayespbase + HAYESP_CMD2, HAYESP_FLOW_CTS); 427 428 /* Set flow control levels */ 429 outb(hayespbase + HAYESP_CMD1, HAYESP_SETRXFLOW); 430 outb(hayespbase + HAYESP_CMD2, 431 HAYESP_HIBYTE(HAYESP_RXHIWMARK)); 432 outb(hayespbase + HAYESP_CMD2, 433 HAYESP_LOBYTE(HAYESP_RXHIWMARK)); 434 outb(hayespbase + HAYESP_CMD2, 435 HAYESP_HIBYTE(HAYESP_RXLOWMARK)); 436 outb(hayespbase + HAYESP_CMD2, 437 HAYESP_LOBYTE(HAYESP_RXLOWMARK)); 438 } else 439 #endif 440 if (ISSET(sc->sc_hwflags, COM_HW_FIFO)) 441 /* Set the FIFO threshold based on the receive speed. */ 442 outb(iobase + com_fifo, 443 FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | 444 (tp->t_ispeed <= 1200 ? FIFO_TRIGGER_1 : FIFO_TRIGGER_8)); 445 /* flush any pending I/O */ 446 while (ISSET(inb(iobase + com_lsr), LSR_RXRDY)) 447 (void) inb(iobase + com_data); 448 /* you turn me on, baby */ 449 sc->sc_mcr = MCR_DTR | MCR_RTS; 450 if (!ISSET(sc->sc_hwflags, COM_HW_NOIEN)) 451 SET(sc->sc_mcr, MCR_IENABLE); 452 outb(iobase + com_mcr, sc->sc_mcr); 453 sc->sc_ier = IER_ERXRDY | IER_ERLS | IER_EMSC; 454 outb(iobase + com_ier, sc->sc_ier); 455 456 sc->sc_msr = inb(iobase + com_msr); 457 if (ISSET(sc->sc_swflags, COM_SW_SOFTCAR) || 458 ISSET(sc->sc_msr, MSR_DCD) || ISSET(tp->t_cflag, MDMBUF)) 459 SET(tp->t_state, TS_CARR_ON); 460 else 461 CLR(tp->t_state, TS_CARR_ON); 462 } else if (ISSET(tp->t_state, TS_XCLUDE) && p->p_ucred->cr_uid != 0) 463 return EBUSY; 464 else 465 s = spltty(); 466 467 /* wait for carrier if necessary */ 468 if (!ISSET(flag, O_NONBLOCK)) 469 while (!ISSET(tp->t_cflag, CLOCAL) && 470 !ISSET(tp->t_state, TS_CARR_ON)) { 471 SET(tp->t_state, TS_WOPEN); 472 error = ttysleep(tp, &tp->t_rawq, TTIPRI | PCATCH, 473 ttopen, 0); 474 if (error) { 475 /* XXX should turn off chip if we're the 476 only waiter */ 477 splx(s); 478 return error; 479 } 480 } 481 splx(s); 482 483 return (*linesw[tp->t_line].l_open)(dev, tp); 484 } 485 486 int 487 comclose(dev, flag, mode, p) 488 dev_t dev; 489 int flag, mode; 490 struct proc *p; 491 { 492 int unit = COMUNIT(dev); 493 struct com_softc *sc = comcd.cd_devs[unit]; 494 struct tty *tp = sc->sc_tty; 495 int iobase = sc->sc_iobase; 496 int s; 497 498 /* XXX This is for cons.c. */ 499 if (!ISSET(tp->t_state, TS_ISOPEN)) 500 return 0; 501 502 (*linesw[tp->t_line].l_close)(tp, flag); 503 s = spltty(); 504 CLR(sc->sc_lcr, LCR_SBREAK); 505 outb(iobase + com_lcr, sc->sc_lcr); 506 outb(iobase + com_ier, 0); 507 if (ISSET(tp->t_cflag, HUPCL) && 508 !ISSET(sc->sc_swflags, COM_SW_SOFTCAR)) { 509 /* XXX perhaps only clear DTR */ 510 outb(iobase + com_mcr, 0); 511 } 512 CLR(tp->t_state, TS_BUSY | TS_FLUSH); 513 if (--comsopen == 0) 514 untimeout(compoll, NULL); 515 splx(s); 516 ttyclose(tp); 517 #ifdef notyet /* XXXX */ 518 if (unit != comconsole) { 519 ttyfree(tp); 520 sc->sc_tty = 0; 521 } 522 #endif 523 return 0; 524 } 525 526 int 527 comread(dev, uio, flag) 528 dev_t dev; 529 struct uio *uio; 530 int flag; 531 { 532 struct com_softc *sc = comcd.cd_devs[COMUNIT(dev)]; 533 struct tty *tp = sc->sc_tty; 534 535 return ((*linesw[tp->t_line].l_read)(tp, uio, flag)); 536 } 537 538 int 539 comwrite(dev, uio, flag) 540 dev_t dev; 541 struct uio *uio; 542 int flag; 543 { 544 struct com_softc *sc = comcd.cd_devs[COMUNIT(dev)]; 545 struct tty *tp = sc->sc_tty; 546 547 return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 548 } 549 550 struct tty * 551 comtty(dev) 552 dev_t dev; 553 { 554 struct com_softc *sc = comcd.cd_devs[COMUNIT(dev)]; 555 struct tty *tp = sc->sc_tty; 556 557 return (tp); 558 } 559 560 static u_char 561 tiocm_xxx2mcr(data) 562 int data; 563 { 564 u_char m = 0; 565 566 if (ISSET(data, TIOCM_DTR)) 567 SET(m, MCR_DTR); 568 if (ISSET(data, TIOCM_RTS)) 569 SET(m, MCR_RTS); 570 return m; 571 } 572 573 int 574 comioctl(dev, cmd, data, flag, p) 575 dev_t dev; 576 u_long cmd; 577 caddr_t data; 578 int flag; 579 struct proc *p; 580 { 581 int unit = COMUNIT(dev); 582 struct com_softc *sc = comcd.cd_devs[unit]; 583 struct tty *tp = sc->sc_tty; 584 int iobase = sc->sc_iobase; 585 int error; 586 587 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); 588 if (error >= 0) 589 return error; 590 error = ttioctl(tp, cmd, data, flag, p); 591 if (error >= 0) 592 return error; 593 594 switch (cmd) { 595 case TIOCSBRK: 596 SET(sc->sc_lcr, LCR_SBREAK); 597 outb(iobase + com_lcr, sc->sc_lcr); 598 break; 599 case TIOCCBRK: 600 CLR(sc->sc_lcr, LCR_SBREAK); 601 outb(iobase + com_lcr, sc->sc_lcr); 602 break; 603 case TIOCSDTR: 604 SET(sc->sc_mcr, sc->sc_dtr); 605 outb(iobase + com_mcr, sc->sc_mcr); 606 break; 607 case TIOCCDTR: 608 CLR(sc->sc_mcr, sc->sc_dtr); 609 outb(iobase + com_mcr, sc->sc_mcr); 610 break; 611 case TIOCMSET: 612 CLR(sc->sc_mcr, MCR_DTR | MCR_RTS); 613 case TIOCMBIS: 614 SET(sc->sc_mcr, tiocm_xxx2mcr(*(int *)data)); 615 outb(iobase + com_mcr, sc->sc_mcr); 616 break; 617 case TIOCMBIC: 618 CLR(sc->sc_mcr, tiocm_xxx2mcr(*(int *)data)); 619 outb(iobase + com_mcr, sc->sc_mcr); 620 break; 621 case TIOCMGET: { 622 u_char m; 623 int bits = 0; 624 625 m = sc->sc_mcr; 626 if (ISSET(m, MCR_DTR)) 627 SET(bits, TIOCM_DTR); 628 if (ISSET(m, MCR_RTS)) 629 SET(bits, TIOCM_RTS); 630 m = sc->sc_msr; 631 if (ISSET(m, MSR_DCD)) 632 SET(bits, TIOCM_CD); 633 if (ISSET(m, MSR_CTS)) 634 SET(bits, TIOCM_CTS); 635 if (ISSET(m, MSR_DSR)) 636 SET(bits, TIOCM_DSR); 637 if (ISSET(m, MSR_RI | MSR_TERI)) 638 SET(bits, TIOCM_RI); 639 if (inb(iobase + com_ier)) 640 SET(bits, TIOCM_LE); 641 *(int *)data = bits; 642 break; 643 } 644 case TIOCGFLAGS: { 645 int driverbits, userbits = 0; 646 647 driverbits = sc->sc_swflags; 648 if (ISSET(driverbits, COM_SW_SOFTCAR)) 649 SET(userbits, TIOCFLAG_SOFTCAR); 650 if (ISSET(driverbits, COM_SW_CLOCAL)) 651 SET(userbits, TIOCFLAG_CLOCAL); 652 if (ISSET(driverbits, COM_SW_CRTSCTS)) 653 SET(userbits, TIOCFLAG_CRTSCTS); 654 if (ISSET(driverbits, COM_SW_MDMBUF)) 655 SET(userbits, TIOCFLAG_MDMBUF); 656 657 *(int *)data = userbits; 658 break; 659 } 660 case TIOCSFLAGS: { 661 int userbits, driverbits = 0; 662 663 error = suser(p->p_ucred, &p->p_acflag); 664 if (error != 0) 665 return(EPERM); 666 667 userbits = *(int *)data; 668 if (ISSET(userbits, TIOCFLAG_SOFTCAR) || 669 ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) 670 SET(driverbits, COM_SW_SOFTCAR); 671 if (ISSET(userbits, TIOCFLAG_CLOCAL)) 672 SET(driverbits, COM_SW_CLOCAL); 673 if (ISSET(userbits, TIOCFLAG_CRTSCTS)) 674 SET(driverbits, COM_SW_CRTSCTS); 675 if (ISSET(userbits, TIOCFLAG_MDMBUF)) 676 SET(driverbits, COM_SW_MDMBUF); 677 678 sc->sc_swflags = driverbits; 679 break; 680 } 681 default: 682 return ENOTTY; 683 } 684 685 return 0; 686 } 687 688 int 689 comparam(tp, t) 690 struct tty *tp; 691 struct termios *t; 692 { 693 struct com_softc *sc = comcd.cd_devs[COMUNIT(tp->t_dev)]; 694 int iobase = sc->sc_iobase; 695 int ospeed = comspeed(t->c_ospeed); 696 u_char lcr; 697 tcflag_t oldcflag; 698 int s; 699 700 /* check requested parameters */ 701 if (ospeed < 0 || (t->c_ispeed && t->c_ispeed != t->c_ospeed)) 702 return EINVAL; 703 704 lcr = ISSET(sc->sc_lcr, LCR_SBREAK); 705 706 switch (ISSET(t->c_cflag, CSIZE)) { 707 case CS5: 708 SET(lcr, LCR_5BITS); 709 break; 710 case CS6: 711 SET(lcr, LCR_6BITS); 712 break; 713 case CS7: 714 SET(lcr, LCR_7BITS); 715 break; 716 case CS8: 717 SET(lcr, LCR_8BITS); 718 break; 719 } 720 if (ISSET(t->c_cflag, PARENB)) { 721 SET(lcr, LCR_PENAB); 722 if (!ISSET(t->c_cflag, PARODD)) 723 SET(lcr, LCR_PEVEN); 724 } 725 if (ISSET(t->c_cflag, CSTOPB)) 726 SET(lcr, LCR_STOPB); 727 728 sc->sc_lcr = lcr; 729 730 s = spltty(); 731 732 if (ospeed == 0) { 733 CLR(sc->sc_mcr, MCR_DTR); 734 outb(iobase + com_mcr, sc->sc_mcr); 735 } 736 737 /* 738 * Set the FIFO threshold based on the receive speed, if we are 739 * changing it. 740 */ 741 #if 1 742 if (tp->t_ispeed != t->c_ispeed) { 743 #else 744 if (1) { 745 #endif 746 if (ospeed != 0) { 747 /* 748 * Make sure the transmit FIFO is empty before 749 * proceeding. If we don't do this, some revisions 750 * of the UART will hang. Interestingly enough, 751 * even if we do this will the last character is 752 * still being pushed out, they don't hang. This 753 * seems good enough. 754 */ 755 while (ISSET(tp->t_state, TS_BUSY)) { 756 int error; 757 758 ++sc->sc_halt; 759 error = ttysleep(tp, &tp->t_outq, 760 TTOPRI | PCATCH, "comprm", 0); 761 --sc->sc_halt; 762 if (error) { 763 splx(s); 764 comstart(tp); 765 return (error); 766 } 767 } 768 769 outb(iobase + com_lcr, lcr | LCR_DLAB); 770 outb(iobase + com_dlbl, ospeed); 771 outb(iobase + com_dlbh, ospeed >> 8); 772 outb(iobase + com_lcr, lcr); 773 SET(sc->sc_mcr, MCR_DTR); 774 outb(iobase + com_mcr, sc->sc_mcr); 775 } else 776 outb(iobase + com_lcr, lcr); 777 778 if (!ISSET(sc->sc_hwflags, COM_HW_HAYESP) && 779 ISSET(sc->sc_hwflags, COM_HW_FIFO)) 780 outb(iobase + com_fifo, 781 FIFO_ENABLE | 782 (t->c_ispeed <= 1200 ? FIFO_TRIGGER_1 : FIFO_TRIGGER_8)); 783 } else 784 outb(iobase + com_lcr, lcr); 785 786 /* When not using CRTSCTS, RTS follows DTR. */ 787 if (!ISSET(t->c_cflag, CRTSCTS)) { 788 if (ISSET(sc->sc_mcr, MCR_DTR)) { 789 if (!ISSET(sc->sc_mcr, MCR_RTS)) { 790 SET(sc->sc_mcr, MCR_RTS); 791 outb(iobase + com_mcr, sc->sc_mcr); 792 } 793 } else { 794 if (ISSET(sc->sc_mcr, MCR_RTS)) { 795 CLR(sc->sc_mcr, MCR_RTS); 796 outb(iobase + com_mcr, sc->sc_mcr); 797 } 798 } 799 sc->sc_dtr = MCR_DTR | MCR_RTS; 800 } else 801 sc->sc_dtr = MCR_DTR; 802 803 /* and copy to tty */ 804 tp->t_ispeed = t->c_ispeed; 805 tp->t_ospeed = t->c_ospeed; 806 oldcflag = tp->t_cflag; 807 tp->t_cflag = t->c_cflag; 808 809 /* 810 * If DCD is off and MDMBUF is changed, ask the tty layer if we should 811 * stop the device. 812 */ 813 if (!ISSET(sc->sc_msr, MSR_DCD) && 814 !ISSET(sc->sc_swflags, COM_SW_SOFTCAR) && 815 ISSET(oldcflag, MDMBUF) != ISSET(tp->t_cflag, MDMBUF) && 816 (*linesw[tp->t_line].l_modem)(tp, 0) == 0) { 817 CLR(sc->sc_mcr, sc->sc_dtr); 818 outb(iobase + com_mcr, sc->sc_mcr); 819 } 820 821 /* Just to be sure... */ 822 splx(s); 823 comstart(tp); 824 return 0; 825 } 826 827 void 828 comstart(tp) 829 struct tty *tp; 830 { 831 struct com_softc *sc = comcd.cd_devs[COMUNIT(tp->t_dev)]; 832 int iobase = sc->sc_iobase; 833 int s; 834 835 s = spltty(); 836 if (ISSET(tp->t_state, TS_BUSY)) 837 goto out; 838 if (ISSET(tp->t_state, TS_TIMEOUT | TS_TTSTOP) || 839 sc->sc_halt > 0) 840 goto stopped; 841 if (ISSET(tp->t_cflag, CRTSCTS) && !ISSET(sc->sc_msr, MSR_CTS)) 842 goto stopped; 843 if (tp->t_outq.c_cc <= tp->t_lowat) { 844 if (ISSET(tp->t_state, TS_ASLEEP)) { 845 CLR(tp->t_state, TS_ASLEEP); 846 wakeup(&tp->t_outq); 847 } 848 if (tp->t_outq.c_cc == 0) 849 goto stopped; 850 selwakeup(&tp->t_wsel); 851 } 852 SET(tp->t_state, TS_BUSY); 853 854 if (!ISSET(sc->sc_ier, IER_ETXRDY)) { 855 SET(sc->sc_ier, IER_ETXRDY); 856 outb(iobase + com_ier, sc->sc_ier); 857 } 858 #ifdef COM_HAYESP 859 if (ISSET(sc->sc_hwflags, COM_HW_HAYESP)) { 860 u_char buffer[1024], *cp = buffer; 861 int n = q_to_b(&tp->t_outq, cp, sizeof buffer); 862 do 863 outb(iobase + com_data, *cp++); 864 while (--n); 865 } 866 else 867 #endif 868 if (ISSET(sc->sc_hwflags, COM_HW_FIFO)) { 869 u_char buffer[16], *cp = buffer; 870 int n = q_to_b(&tp->t_outq, cp, sizeof buffer); 871 do { 872 outb(iobase + com_data, *cp++); 873 } while (--n); 874 } else 875 outb(iobase + com_data, getc(&tp->t_outq)); 876 out: 877 splx(s); 878 return; 879 stopped: 880 if (ISSET(sc->sc_ier, IER_ETXRDY)) { 881 CLR(sc->sc_ier, IER_ETXRDY); 882 outb(iobase + com_ier, sc->sc_ier); 883 } 884 splx(s); 885 } 886 887 /* 888 * Stop output on a line. 889 */ 890 void 891 comstop(tp, flag) 892 struct tty *tp; 893 { 894 int s; 895 896 s = spltty(); 897 if (ISSET(tp->t_state, TS_BUSY)) 898 if (!ISSET(tp->t_state, TS_TTSTOP)) 899 SET(tp->t_state, TS_FLUSH); 900 splx(s); 901 } 902 903 void 904 comdiag(arg) 905 void *arg; 906 { 907 struct com_softc *sc = arg; 908 int overflows, floods; 909 int s; 910 911 s = spltty(); 912 sc->sc_errors = 0; 913 overflows = sc->sc_overflows; 914 sc->sc_overflows = 0; 915 floods = sc->sc_floods; 916 sc->sc_floods = 0; 917 splx(s); 918 919 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf overflow%s\n", 920 sc->sc_dev.dv_xname, 921 overflows, overflows == 1 ? "" : "s", 922 floods, floods == 1 ? "" : "s"); 923 } 924 925 void 926 compoll(arg) 927 void *arg; 928 { 929 int unit; 930 struct com_softc *sc; 931 struct tty *tp; 932 register u_char *ibufp; 933 u_char *ibufend; 934 register int c; 935 int s; 936 static int lsrmap[8] = { 937 0, TTY_PE, 938 TTY_FE, TTY_PE|TTY_FE, 939 TTY_FE, TTY_PE|TTY_FE, 940 TTY_FE, TTY_PE|TTY_FE 941 }; 942 943 s = spltty(); 944 if (comevents == 0) { 945 splx(s); 946 goto out; 947 } 948 comevents = 0; 949 splx(s); 950 951 for (unit = 0; unit < comcd.cd_ndevs; unit++) { 952 sc = comcd.cd_devs[unit]; 953 if (sc == 0 || sc->sc_ibufp == sc->sc_ibuf) 954 continue; 955 956 tp = sc->sc_tty; 957 958 s = spltty(); 959 960 ibufp = sc->sc_ibuf; 961 ibufend = sc->sc_ibufp; 962 963 if (ibufp == ibufend) { 964 splx(s); 965 continue; 966 } 967 968 sc->sc_ibufp = sc->sc_ibuf = (ibufp == sc->sc_ibufs[0]) ? 969 sc->sc_ibufs[1] : sc->sc_ibufs[0]; 970 sc->sc_ibufhigh = sc->sc_ibuf + COM_IHIGHWATER; 971 sc->sc_ibufend = sc->sc_ibuf + COM_IBUFSIZE; 972 973 if (tp == 0 || !ISSET(tp->t_state, TS_ISOPEN)) { 974 splx(s); 975 continue; 976 } 977 978 if (ISSET(tp->t_cflag, CRTSCTS) && 979 !ISSET(sc->sc_mcr, MCR_RTS)) { 980 /* XXX */ 981 SET(sc->sc_mcr, MCR_RTS); 982 outb(sc->sc_iobase + com_mcr, sc->sc_mcr); 983 } 984 985 splx(s); 986 987 while (ibufp < ibufend) { 988 c = *ibufp++; 989 if (*ibufp & LSR_OE) { 990 sc->sc_overflows++; 991 if (sc->sc_errors++ == 0) 992 timeout(comdiag, sc, 60 * hz); 993 } 994 /* This is ugly, but fast. */ 995 c |= lsrmap[(*ibufp++ & (LSR_BI|LSR_FE|LSR_PE)) >> 2]; 996 (*linesw[tp->t_line].l_rint)(c, tp); 997 } 998 } 999 1000 out: 1001 timeout(compoll, NULL, 1); 1002 } 1003 1004 int 1005 comintr(arg) 1006 void *arg; 1007 { 1008 struct com_softc *sc = arg; 1009 int iobase = sc->sc_iobase; 1010 struct tty *tp; 1011 u_char lsr, data, msr, delta; 1012 #ifdef COM_DEBUG 1013 int n; 1014 struct { 1015 u_char iir, lsr, msr; 1016 } iter[32]; 1017 #endif 1018 1019 #ifdef COM_DEBUG 1020 n = 0; 1021 if (ISSET(iter[n].iir = inb(iobase + com_iir), IIR_NOPEND)) 1022 return (0); 1023 #else 1024 if (ISSET(inb(iobase + com_iir), IIR_NOPEND)) 1025 return (0); 1026 #endif 1027 1028 tp = sc->sc_tty; 1029 1030 for (;;) { 1031 #ifdef COM_DEBUG 1032 iter[n].lsr = 1033 #endif 1034 lsr = inb(iobase + com_lsr); 1035 1036 if (ISSET(lsr, LSR_RXRDY)) { 1037 register u_char *p = sc->sc_ibufp; 1038 1039 comevents = 1; 1040 do { 1041 data = inb(iobase + com_data); 1042 if (ISSET(lsr, LSR_BI)) { 1043 #ifdef notdef 1044 printf("break %02x %02x %02x %02x\n", 1045 sc->sc_msr, sc->sc_mcr, sc->sc_lcr, 1046 sc->sc_dtr); 1047 #endif 1048 #ifdef DDB 1049 if (sc->sc_dev.dv_unit == comconsole) { 1050 Debugger(); 1051 goto next; 1052 } 1053 #endif 1054 } 1055 if (p >= sc->sc_ibufend) { 1056 sc->sc_floods++; 1057 if (sc->sc_errors++ == 0) 1058 timeout(comdiag, sc, 60 * hz); 1059 } else { 1060 *p++ = data; 1061 *p++ = lsr; 1062 if (p == sc->sc_ibufhigh && 1063 ISSET(tp->t_cflag, CRTSCTS)) { 1064 /* XXX */ 1065 CLR(sc->sc_mcr, MCR_RTS); 1066 outb(iobase + com_mcr, 1067 sc->sc_mcr); 1068 } 1069 } 1070 next: 1071 #ifdef COM_DEBUG 1072 if (++n >= 32) 1073 goto ohfudge; 1074 iter[n].lsr = 1075 #endif 1076 lsr = inb(iobase + com_lsr); 1077 } while (ISSET(lsr, LSR_RXRDY)); 1078 1079 sc->sc_ibufp = p; 1080 } 1081 #ifdef COM_DEBUG 1082 else if (ISSET(lsr, LSR_BI|LSR_FE|LSR_PE|LSR_OE)) 1083 printf("weird lsr %02x\n", lsr); 1084 #endif 1085 1086 #ifdef COM_DEBUG 1087 iter[n].msr = 1088 #endif 1089 msr = inb(iobase + com_msr); 1090 1091 if (msr != sc->sc_msr) { 1092 delta = msr ^ sc->sc_msr; 1093 sc->sc_msr = msr; 1094 if (ISSET(delta, MSR_DCD) && 1095 !ISSET(sc->sc_swflags, COM_SW_SOFTCAR) && 1096 (*linesw[tp->t_line].l_modem)(tp, ISSET(msr, MSR_DCD)) == 0) { 1097 CLR(sc->sc_mcr, sc->sc_dtr); 1098 outb(iobase + com_mcr, sc->sc_mcr); 1099 } 1100 if (ISSET(delta & msr, MSR_CTS) && 1101 ISSET(tp->t_cflag, CRTSCTS)) { 1102 /* the line is up and we want to do rts/cts flow control */ 1103 (*linesw[tp->t_line].l_start)(tp); 1104 } 1105 } 1106 1107 if (ISSET(lsr, LSR_TXRDY) && ISSET(tp->t_state, TS_BUSY)) { 1108 CLR(tp->t_state, TS_BUSY | TS_FLUSH); 1109 if (sc->sc_halt > 0) 1110 wakeup(&tp->t_outq); 1111 (*linesw[tp->t_line].l_start)(tp); 1112 } 1113 1114 #ifdef COM_DEBUG 1115 if (++n >= 32) 1116 goto ohfudge; 1117 if (ISSET(iter[n].iir = inb(iobase + com_iir), IIR_NOPEND)) 1118 return (1); 1119 #else 1120 if (ISSET(inb(iobase + com_iir), IIR_NOPEND)) 1121 return (1); 1122 #endif 1123 } 1124 #ifdef COM_DEBUG 1125 ohfudge: 1126 printf("comintr: too many iterations"); 1127 for (n = 0; n < 32; n++) { 1128 if ((n % 4) == 0) 1129 printf("\ncomintr: iter[%02d]", n); 1130 printf(" %02x %02x %02x", iter[n].iir, iter[n].lsr, iter[n].msr); 1131 } 1132 printf("\n"); 1133 printf("comintr: msr %02x mcr %02x lcr %02x ier %02x\n", 1134 sc->sc_msr, sc->sc_mcr, sc->sc_lcr, sc->sc_ier); 1135 printf("comintr: state %08x cc %d\n", sc->sc_tty->t_state, 1136 sc->sc_tty->t_outq.c_cc); 1137 #endif 1138 } 1139 1140 /* 1141 * Following are all routines needed for COM to act as console 1142 */ 1143 #include <dev/cons.h> 1144 1145 void 1146 comcnprobe(cp) 1147 struct consdev *cp; 1148 { 1149 1150 if (!comprobe1(CONADDR)) { 1151 cp->cn_pri = CN_DEAD; 1152 return; 1153 } 1154 1155 /* locate the major number */ 1156 for (commajor = 0; commajor < nchrdev; commajor++) 1157 if (cdevsw[commajor].d_open == comopen) 1158 break; 1159 1160 /* initialize required fields */ 1161 cp->cn_dev = makedev(commajor, CONUNIT); 1162 #ifdef COMCONSOLE 1163 cp->cn_pri = CN_REMOTE; /* Force a serial port console */ 1164 #else 1165 cp->cn_pri = CN_NORMAL; 1166 #endif 1167 } 1168 1169 void 1170 comcninit(cp) 1171 struct consdev *cp; 1172 { 1173 1174 cominit(CONUNIT, comdefaultrate); 1175 comconsole = CONUNIT; 1176 comconsinit = 0; 1177 } 1178 1179 cominit(unit, rate) 1180 int unit, rate; 1181 { 1182 int s = splhigh(); 1183 int iobase = CONADDR; 1184 u_char stat; 1185 1186 outb(iobase + com_lcr, LCR_DLAB); 1187 rate = comspeed(comdefaultrate); 1188 outb(iobase + com_dlbl, rate); 1189 outb(iobase + com_dlbh, rate >> 8); 1190 outb(iobase + com_lcr, LCR_8BITS); 1191 outb(iobase + com_ier, IER_ERXRDY | IER_ETXRDY); 1192 outb(iobase + com_fifo, FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_4); 1193 stat = inb(iobase + com_iir); 1194 splx(s); 1195 } 1196 1197 comcngetc(dev) 1198 dev_t dev; 1199 { 1200 int s = splhigh(); 1201 int iobase = CONADDR; 1202 u_char stat, c; 1203 1204 while (!ISSET(stat = inb(iobase + com_lsr), LSR_RXRDY)) 1205 ; 1206 c = inb(iobase + com_data); 1207 stat = inb(iobase + com_iir); 1208 splx(s); 1209 return c; 1210 } 1211 1212 /* 1213 * Console kernel output character routine. 1214 */ 1215 void 1216 comcnputc(dev, c) 1217 dev_t dev; 1218 int c; 1219 { 1220 int s = splhigh(); 1221 int iobase = CONADDR; 1222 u_char stat; 1223 register int timo; 1224 1225 #ifdef KGDB 1226 if (dev != kgdb_dev) 1227 #endif 1228 if (comconsinit == 0) { 1229 (void) cominit(COMUNIT(dev), comdefaultrate); 1230 comconsinit = 1; 1231 } 1232 /* wait for any pending transmission to finish */ 1233 timo = 50000; 1234 while (!ISSET(stat = inb(iobase + com_lsr), LSR_TXRDY) && --timo) 1235 ; 1236 outb(iobase + com_data, c); 1237 /* wait for this transmission to complete */ 1238 timo = 1500000; 1239 while (!ISSET(stat = inb(iobase + com_lsr), LSR_TXRDY) && --timo) 1240 ; 1241 /* clear any interrupts generated by this transmission */ 1242 stat = inb(iobase + com_iir); 1243 splx(s); 1244 } 1245 1246 void 1247 comcnpollc(dev, on) 1248 dev_t dev; 1249 int on; 1250 { 1251 1252 } 1253
Indexes created Wed Sep 24 05:09:52 GMT 2025