com.c revision 1.101
1 /* $NetBSD: com.c,v 1.101 1997/06/15 11:18:59 mycroft Exp $ */ 2 3 /*- 4 * Copyright (c) 1993, 1994, 1995, 1996, 1997 5 * Charles M. Hannum. All rights reserved. 6 * 7 * Interrupt processing and hardware flow control partly based on code from 8 * Onno van der Linden and Gordon Ross. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by Charles M. Hannum. 21 * 4. The name of the author may not be used to endorse or promote products 22 * derived from this software without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 27 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 28 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 29 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 30 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 33 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 /* 37 * Copyright (c) 1991 The Regents of the University of California. 38 * All rights reserved. 39 * 40 * Redistribution and use in source and binary forms, with or without 41 * modification, are permitted provided that the following conditions 42 * are met: 43 * 1. Redistributions of source code must retain the above copyright 44 * notice, this list of conditions and the following disclaimer. 45 * 2. Redistributions in binary form must reproduce the above copyright 46 * notice, this list of conditions and the following disclaimer in the 47 * documentation and/or other materials provided with the distribution. 48 * 3. All advertising materials mentioning features or use of this software 49 * must display the following acknowledgement: 50 * This product includes software developed by the University of 51 * California, Berkeley and its contributors. 52 * 4. Neither the name of the University nor the names of its contributors 53 * may be used to endorse or promote products derived from this software 54 * without specific prior written permission. 55 * 56 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 57 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 58 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 59 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 60 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 61 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 62 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 63 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 64 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 65 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 66 * SUCH DAMAGE. 67 * 68 * @(#)com.c 7.5 (Berkeley) 5/16/91 69 */ 70 71 /* 72 * COM driver, uses National Semiconductor NS16450/NS16550AF UART 73 */ 74 #include <sys/param.h> 75 #include <sys/systm.h> 76 #include <sys/ioctl.h> 77 #include <sys/select.h> 78 #include <sys/tty.h> 79 #include <sys/proc.h> 80 #include <sys/user.h> 81 #include <sys/conf.h> 82 #include <sys/file.h> 83 #include <sys/uio.h> 84 #include <sys/kernel.h> 85 #include <sys/syslog.h> 86 #include <sys/types.h> 87 #include <sys/device.h> 88 89 #include <machine/intr.h> 90 #include <machine/bus.h> 91 92 #include <dev/isa/comreg.h> 93 #include <dev/isa/comvar.h> 94 #include <dev/ic/ns16550reg.h> 95 #ifdef COM_HAYESP 96 #include <dev/ic/hayespreg.h> 97 #endif 98 #define com_lcr com_cfcr 99 100 #include "com.h" 101 102 #ifdef COM_HAYESP 103 int comprobeHAYESP __P((bus_space_handle_t hayespioh, struct com_softc *sc)); 104 #endif 105 #ifdef KGDB 106 void com_kgdb_attach __P((struct com_softc *, bus_space_tag_t, 107 bus_space_handle_t)); 108 #endif 109 void com_attach_subr __P((struct com_softc *sc)); 110 void comdiag __P((void *)); 111 int comspeed __P((long)); 112 int comparam __P((struct tty *, struct termios *)); 113 void comstart __P((struct tty *)); 114 void comstop __P((struct tty *, int)); 115 #ifdef __GENERIC_SOFT_INTERRUPTS 116 void comsoft __P((void *)); 117 #else 118 #ifndef alpha 119 void comsoft __P((void)); 120 #else 121 void comsoft __P((void *)); 122 #endif 123 #endif 124 int comhwiflow __P((struct tty *, int)); 125 126 void com_loadchannelregs __P((struct com_softc *)); 127 void com_hwiflow __P((struct com_softc *)); 128 void com_break __P((struct com_softc *, int)); 129 void com_modem __P((struct com_softc *, int)); 130 void com_iflush __P((struct com_softc *)); 131 132 /* XXX: These belong elsewhere */ 133 cdev_decl(com); 134 bdev_decl(com); 135 136 struct consdev; 137 void comcnprobe __P((struct consdev *)); 138 void comcninit __P((struct consdev *)); 139 int comcngetc __P((dev_t)); 140 void comcnputc __P((dev_t, int)); 141 void comcnpollc __P((dev_t, int)); 142 143 #define integrate static inline 144 integrate void comrxint __P((struct com_softc *, struct tty *)); 145 integrate void comtxint __P((struct com_softc *, struct tty *)); 146 integrate void commsrint __P((struct com_softc *, struct tty *)); 147 integrate void com_schedrx __P((struct com_softc *)); 148 149 struct cfdriver com_cd = { 150 NULL, "com", DV_TTY 151 }; 152 153 void cominitcons __P((bus_space_tag_t, bus_space_handle_t, int)); 154 155 #ifdef CONSPEED 156 int comconsrate = CONSPEED; 157 #else 158 int comconsrate = TTYDEF_SPEED; 159 #endif 160 int comconsaddr; 161 int comconsattached; 162 bus_space_tag_t comconstag; 163 bus_space_handle_t comconsioh; 164 tcflag_t comconscflag = TTYDEF_CFLAG; 165 166 int commajor; 167 168 #ifndef __GENERIC_SOFT_INTERRUPTS 169 #ifdef alpha 170 volatile int com_softintr_scheduled; 171 #endif 172 #endif 173 174 #ifdef KGDB 175 #include <machine/remote-sl.h> 176 extern int kgdb_dev; 177 extern int kgdb_rate; 178 extern int kgdb_debug_init; 179 #endif 180 181 #define COMUNIT(x) (minor(x)) 182 183 int 184 comspeed(speed) 185 long speed; 186 { 187 #define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */ 188 189 int x, err; 190 191 #if 0 192 if (speed == 0) 193 return (0); 194 #endif 195 if (speed <= 0) 196 return (-1); 197 x = divrnd((COM_FREQ / 16), speed); 198 if (x <= 0) 199 return (-1); 200 err = divrnd((COM_FREQ / 16) * 1000, speed * x) - 1000; 201 if (err < 0) 202 err = -err; 203 if (err > COM_TOLERANCE) 204 return (-1); 205 return (x); 206 207 #undef divrnd(n, q) 208 } 209 210 #ifdef COM_DEBUG 211 int com_debug = 0; 212 213 void comstatus __P((struct com_softc *, char *)); 214 void 215 comstatus(sc, str) 216 struct com_softc *sc; 217 char *str; 218 { 219 struct tty *tp = sc->sc_tty; 220 221 printf("%s: %s %sclocal %sdcd %sts_carr_on %sdtr %stx_stopped\n", 222 sc->sc_dev.dv_xname, str, 223 ISSET(tp->t_cflag, CLOCAL) ? "+" : "-", 224 ISSET(sc->sc_msr, MSR_DCD) ? "+" : "-", 225 ISSET(tp->t_state, TS_CARR_ON) ? "+" : "-", 226 ISSET(sc->sc_mcr, MCR_DTR) ? "+" : "-", 227 sc->sc_tx_stopped ? "+" : "-"); 228 229 printf("%s: %s %scrtscts %scts %sts_ttstop %srts %xrx_flags\n", 230 sc->sc_dev.dv_xname, str, 231 ISSET(tp->t_cflag, CRTSCTS) ? "+" : "-", 232 ISSET(sc->sc_msr, MSR_CTS) ? "+" : "-", 233 ISSET(tp->t_state, TS_TTSTOP) ? "+" : "-", 234 ISSET(sc->sc_mcr, MCR_RTS) ? "+" : "-", 235 sc->sc_rx_flags); 236 } 237 #endif 238 239 int 240 comprobe1(iot, ioh, iobase) 241 bus_space_tag_t iot; 242 bus_space_handle_t ioh; 243 int iobase; 244 { 245 246 /* force access to id reg */ 247 bus_space_write_1(iot, ioh, com_lcr, 0); 248 bus_space_write_1(iot, ioh, com_iir, 0); 249 if (bus_space_read_1(iot, ioh, com_iir) & 0x38) 250 return (0); 251 252 return (1); 253 } 254 255 #ifdef COM_HAYESP 256 int 257 comprobeHAYESP(hayespioh, sc) 258 bus_space_handle_t hayespioh; 259 struct com_softc *sc; 260 { 261 char val, dips; 262 int combaselist[] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8 }; 263 bus_space_tag_t iot = sc->sc_iot; 264 265 /* 266 * Hayes ESP cards have two iobases. One is for compatibility with 267 * 16550 serial chips, and at the same ISA PC base addresses. The 268 * other is for ESP-specific enhanced features, and lies at a 269 * different addressing range entirely (0x140, 0x180, 0x280, or 0x300). 270 */ 271 272 /* Test for ESP signature */ 273 if ((bus_space_read_1(iot, hayespioh, 0) & 0xf3) == 0) 274 return (0); 275 276 /* 277 * ESP is present at ESP enhanced base address; unknown com port 278 */ 279 280 /* Get the dip-switch configurations */ 281 bus_space_write_1(iot, hayespioh, HAYESP_CMD1, HAYESP_GETDIPS); 282 dips = bus_space_read_1(iot, hayespioh, HAYESP_STATUS1); 283 284 /* Determine which com port this ESP card services: bits 0,1 of */ 285 /* dips is the port # (0-3); combaselist[val] is the com_iobase */ 286 if (sc->sc_iobase != combaselist[dips & 0x03]) 287 return (0); 288 289 printf(": ESP"); 290 291 /* Check ESP Self Test bits. */ 292 /* Check for ESP version 2.0: bits 4,5,6 == 010 */ 293 bus_space_write_1(iot, hayespioh, HAYESP_CMD1, HAYESP_GETTEST); 294 val = bus_space_read_1(iot, hayespioh, HAYESP_STATUS1); /* Clear reg1 */ 295 val = bus_space_read_1(iot, hayespioh, HAYESP_STATUS2); 296 if ((val & 0x70) < 0x20) { 297 printf("-old (%o)", val & 0x70); 298 /* we do not support the necessary features */ 299 return (0); 300 } 301 302 /* Check for ability to emulate 16550: bit 8 == 1 */ 303 if ((dips & 0x80) == 0) { 304 printf(" slave"); 305 /* XXX Does slave really mean no 16550 support?? */ 306 return (0); 307 } 308 309 /* 310 * If we made it this far, we are a full-featured ESP v2.0 (or 311 * better), at the correct com port address. 312 */ 313 314 SET(sc->sc_hwflags, COM_HW_HAYESP); 315 printf(", 1024 byte fifo\n"); 316 return (1); 317 } 318 #endif 319 320 #ifdef KGDB 321 void 322 com_kgdb_attach(sc, iot, ioh) 323 struct com_softc *sc; 324 bus_space_tag_t iot; 325 bus_space_handle_t ioh; 326 { 327 328 if (kgdb_dev == makedev(commajor, unit)) { 329 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) 330 kgdb_dev = -1; /* can't debug over console port */ 331 else { 332 cominitcons(iot, ioh, kgdb_rate); 333 if (kgdb_debug_init) { 334 /* 335 * Print prefix of device name, 336 * let kgdb_connect print the rest. 337 */ 338 printf("%s: ", sc->sc_dev.dv_xname); 339 kgdb_connect(1); 340 } else 341 printf("%s: kgdb enabled\n", 342 sc->sc_dev.dv_xname); 343 } 344 } 345 } 346 #endif 347 348 349 void 350 com_attach_subr(sc) 351 struct com_softc *sc; 352 { 353 int iobase = sc->sc_iobase; 354 bus_space_tag_t iot = sc->sc_iot; 355 bus_space_handle_t ioh = sc->sc_ioh; 356 #ifdef COM_HAYESP 357 int hayesp_ports[] = { 0x140, 0x180, 0x280, 0x300, 0 }; 358 int *hayespp; 359 #endif 360 361 if (iobase == comconsaddr) { 362 comconsattached = 1; 363 364 /* Make sure the console is always "hardwired". */ 365 delay(1000); /* wait for output to finish */ 366 SET(sc->sc_hwflags, COM_HW_CONSOLE); 367 SET(sc->sc_swflags, TIOCFLAG_SOFTCAR); 368 } 369 370 #ifdef COM_HAYESP 371 /* Look for a Hayes ESP board. */ 372 for (hayespp = hayesp_ports; *hayespp != 0; hayespp++) { 373 bus_space_handle_t hayespioh; 374 375 #define HAYESP_NPORTS 8 /* XXX XXX XXX ??? ??? ??? */ 376 if (bus_space_map(iot, *hayespp, HAYESP_NPORTS, 0, &hayespioh)) 377 continue; 378 if (comprobeHAYESP(hayespioh, sc)) { 379 sc->sc_hayespioh = hayespioh; 380 sc->sc_fifolen = 1024; 381 382 /* Set 16550 compatibility mode */ 383 bus_space_write_1(iot, hayespioh, HAYESP_CMD1, HAYESP_SETMODE); 384 bus_space_write_1(iot, hayespioh, HAYESP_CMD2, 385 HAYESP_MODE_FIFO|HAYESP_MODE_RTS| 386 HAYESP_MODE_SCALE); 387 388 /* Set RTS/CTS flow control */ 389 bus_space_write_1(iot, hayespioh, HAYESP_CMD1, HAYESP_SETFLOWTYPE); 390 bus_space_write_1(iot, hayespioh, HAYESP_CMD2, HAYESP_FLOW_RTS); 391 bus_space_write_1(iot, hayespioh, HAYESP_CMD2, HAYESP_FLOW_CTS); 392 393 /* Set flow control levels */ 394 bus_space_write_1(iot, hayespioh, HAYESP_CMD1, HAYESP_SETRXFLOW); 395 bus_space_write_1(iot, hayespioh, HAYESP_CMD2, 396 HAYESP_HIBYTE(HAYESP_RXHIWMARK)); 397 bus_space_write_1(iot, hayespioh, HAYESP_CMD2, 398 HAYESP_LOBYTE(HAYESP_RXHIWMARK)); 399 bus_space_write_1(iot, hayespioh, HAYESP_CMD2, 400 HAYESP_HIBYTE(HAYESP_RXLOWMARK)); 401 bus_space_write_1(iot, hayespioh, HAYESP_CMD2, 402 HAYESP_LOBYTE(HAYESP_RXLOWMARK)); 403 404 break; 405 } 406 bus_space_unmap(iot, hayespioh, HAYESP_NPORTS); 407 } 408 /* No ESP; look for other things. */ 409 if (*hayespp == 0) { 410 #endif 411 412 sc->sc_fifolen = 1; 413 /* look for a NS 16550AF UART with FIFOs */ 414 bus_space_write_1(iot, ioh, com_fifo, 415 FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_14); 416 delay(100); 417 if (ISSET(bus_space_read_1(iot, ioh, com_iir), IIR_FIFO_MASK) 418 == IIR_FIFO_MASK) 419 if (ISSET(bus_space_read_1(iot, ioh, com_fifo), FIFO_TRIGGER_14) 420 == FIFO_TRIGGER_14) { 421 SET(sc->sc_hwflags, COM_HW_FIFO); 422 printf(": ns16550a, working fifo\n"); 423 sc->sc_fifolen = 16; 424 } else 425 printf(": ns16550, broken fifo\n"); 426 else 427 printf(": ns8250 or ns16450, no fifo\n"); 428 bus_space_write_1(iot, ioh, com_fifo, 0); 429 #ifdef COM_HAYESP 430 } 431 #endif 432 433 if (!ISSET(sc->sc_hwflags, COM_HW_NOIEN)) 434 SET(sc->sc_mcr, MCR_IENABLE); 435 436 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 437 cominit(iot, ioh, comconsrate); 438 printf("%s: console\n", sc->sc_dev.dv_xname); 439 } 440 441 #ifdef KGDB 442 com_kgdb_attach(sc, iot, ioh); 443 #endif 444 445 #ifdef __GENERIC_SOFT_INTERRUPTS 446 sc->sc_si = softintr_establish(IPL_SOFTSERIAL, comsoft, sc); 447 #endif 448 } 449 450 int 451 comopen(dev, flag, mode, p) 452 dev_t dev; 453 int flag, mode; 454 struct proc *p; 455 { 456 int unit = COMUNIT(dev); 457 struct com_softc *sc; 458 struct tty *tp; 459 int s, s2; 460 int error = 0; 461 462 if (unit >= com_cd.cd_ndevs) 463 return (ENXIO); 464 sc = com_cd.cd_devs[unit]; 465 if (!sc) 466 return (ENXIO); 467 468 if (!sc->sc_tty) { 469 tp = sc->sc_tty = ttymalloc(); 470 tty_attach(tp); 471 } else 472 tp = sc->sc_tty; 473 474 if (ISSET(tp->t_state, TS_ISOPEN) && 475 ISSET(tp->t_state, TS_XCLUDE) && 476 p->p_ucred->cr_uid != 0) 477 return (EBUSY); 478 479 s = spltty(); 480 481 /* We need to set this early for the benefit of comsoft(). */ 482 SET(tp->t_state, TS_WOPEN); 483 484 /* 485 * Do the following iff this is a first open. 486 */ 487 if (!ISSET(tp->t_state, TS_ISOPEN)) { 488 struct termios t; 489 490 /* Turn on interrupts. */ 491 sc->sc_ier = IER_ERXRDY | IER_ERLS | IER_EMSC; 492 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 493 494 /* Fetch the current modem control status, needed later. */ 495 sc->sc_msr = bus_space_read_1(sc->sc_iot, sc->sc_ioh, com_msr); 496 497 /* Add some entry points needed by the tty layer. */ 498 tp->t_oproc = comstart; 499 tp->t_param = comparam; 500 tp->t_hwiflow = comhwiflow; 501 tp->t_dev = dev; 502 503 /* 504 * Initialize the termios status to the defaults. Add in the 505 * sticky bits from TIOCSFLAGS. 506 */ 507 t.c_ispeed = 0; 508 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 509 t.c_ospeed = comconsrate; 510 t.c_cflag = comconscflag; 511 } else { 512 t.c_ospeed = TTYDEF_SPEED; 513 t.c_cflag = TTYDEF_CFLAG; 514 } 515 if (ISSET(sc->sc_swflags, TIOCFLAG_CLOCAL)) 516 SET(t.c_cflag, CLOCAL); 517 if (ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS)) 518 SET(t.c_cflag, CRTSCTS); 519 if (ISSET(sc->sc_swflags, TIOCFLAG_MDMBUF)) 520 SET(t.c_cflag, MDMBUF); 521 tp->t_iflag = TTYDEF_IFLAG; 522 tp->t_oflag = TTYDEF_OFLAG; 523 tp->t_lflag = TTYDEF_LFLAG; 524 ttychars(tp); 525 (void) comparam(tp, &t); 526 ttsetwater(tp); 527 528 s2 = splserial(); 529 530 /* 531 * Turn on DTR. We must always do this, even if carrier is not 532 * present, because otherwise we'd have to use TIOCSDTR 533 * immediately after setting CLOCAL. We will drop DTR only on 534 * the next high-low transition of DCD, or by explicit request. 535 */ 536 com_modem(sc, 1); 537 538 /* Clear the input ring, and unblock. */ 539 sc->sc_rbput = sc->sc_rbget = 0; 540 sc->sc_rbavail = RXBUFSIZE; 541 com_iflush(sc); 542 CLR(sc->sc_rx_flags, RX_ANY_BLOCK); 543 com_hwiflow(sc); 544 545 #ifdef COM_DEBUG 546 if (com_debug) 547 comstatus(sc, "comopen "); 548 #endif 549 550 splx(s2); 551 } 552 error = 0; 553 554 /* If we're doing a blocking open... */ 555 if (!ISSET(flag, O_NONBLOCK)) 556 /* ...then wait for carrier. */ 557 while (!ISSET(tp->t_state, TS_CARR_ON) && 558 !ISSET(tp->t_cflag, CLOCAL | MDMBUF)) { 559 error = ttysleep(tp, &tp->t_rawq, TTIPRI | PCATCH, 560 ttopen, 0); 561 if (error) { 562 /* 563 * If the open was interrupted and nobody 564 * else has the device open, then hang up. 565 */ 566 if (!ISSET(tp->t_state, TS_ISOPEN)) { 567 com_modem(sc, 0); 568 CLR(tp->t_state, TS_WOPEN); 569 ttwakeup(tp); 570 } 571 break; 572 } 573 SET(tp->t_state, TS_WOPEN); 574 } 575 576 splx(s); 577 if (error == 0) 578 error = (*linesw[tp->t_line].l_open)(dev, tp); 579 return (error); 580 } 581 582 int 583 comclose(dev, flag, mode, p) 584 dev_t dev; 585 int flag, mode; 586 struct proc *p; 587 { 588 int unit = COMUNIT(dev); 589 struct com_softc *sc = com_cd.cd_devs[unit]; 590 struct tty *tp = sc->sc_tty; 591 int s; 592 593 /* XXX This is for cons.c. */ 594 if (!ISSET(tp->t_state, TS_ISOPEN)) 595 return (0); 596 597 (*linesw[tp->t_line].l_close)(tp, flag); 598 ttyclose(tp); 599 600 /* If we were asserting flow control, then deassert it. */ 601 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 602 com_hwiflow(sc); 603 /* Clear any break condition set with TIOCSBRK. */ 604 com_break(sc, 0); 605 /* 606 * Hang up if necessary. Wait a bit, so the other side has time to 607 * notice even if we immediately open the port again. 608 */ 609 if (ISSET(tp->t_cflag, HUPCL)) { 610 com_modem(sc, 0); 611 (void) tsleep(sc, TTIPRI, ttclos, hz); 612 } 613 614 s = splserial(); 615 /* Turn off interrupts. */ 616 sc->sc_ier = 0; 617 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 618 splx(s); 619 620 return (0); 621 } 622 623 int 624 comread(dev, uio, flag) 625 dev_t dev; 626 struct uio *uio; 627 int flag; 628 { 629 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 630 struct tty *tp = sc->sc_tty; 631 632 return ((*linesw[tp->t_line].l_read)(tp, uio, flag)); 633 } 634 635 int 636 comwrite(dev, uio, flag) 637 dev_t dev; 638 struct uio *uio; 639 int flag; 640 { 641 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 642 struct tty *tp = sc->sc_tty; 643 644 return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 645 } 646 647 struct tty * 648 comtty(dev) 649 dev_t dev; 650 { 651 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 652 struct tty *tp = sc->sc_tty; 653 654 return (tp); 655 } 656 657 int 658 comioctl(dev, cmd, data, flag, p) 659 dev_t dev; 660 u_long cmd; 661 caddr_t data; 662 int flag; 663 struct proc *p; 664 { 665 int unit = COMUNIT(dev); 666 struct com_softc *sc = com_cd.cd_devs[unit]; 667 struct tty *tp = sc->sc_tty; 668 int error; 669 670 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); 671 if (error >= 0) 672 return (error); 673 674 error = ttioctl(tp, cmd, data, flag, p); 675 if (error >= 0) 676 return (error); 677 678 switch (cmd) { 679 case TIOCSBRK: 680 com_break(sc, 1); 681 break; 682 683 case TIOCCBRK: 684 com_break(sc, 0); 685 break; 686 687 case TIOCSDTR: 688 com_modem(sc, 1); 689 break; 690 691 case TIOCCDTR: 692 com_modem(sc, 0); 693 break; 694 695 case TIOCGFLAGS: 696 *(int *)data = sc->sc_swflags; 697 break; 698 699 case TIOCSFLAGS: 700 error = suser(p->p_ucred, &p->p_acflag); 701 if (error) 702 return (error); 703 sc->sc_swflags = *(int *)data; 704 break; 705 706 case TIOCMSET: 707 case TIOCMBIS: 708 case TIOCMBIC: 709 case TIOCMGET: 710 default: 711 return (ENOTTY); 712 } 713 714 #ifdef COM_DEBUG 715 if (com_debug) 716 comstatus(sc, "comioctl "); 717 #endif 718 719 return (0); 720 } 721 722 integrate void 723 com_schedrx(sc) 724 struct com_softc *sc; 725 { 726 727 sc->sc_rx_ready = 1; 728 729 /* Wake up the poller. */ 730 #ifdef __GENERIC_SOFT_INTERRUPTS 731 softintr_schedule(sc->sc_si); 732 #else 733 #ifndef alpha 734 setsoftserial(); 735 #else 736 if (!com_softintr_scheduled) { 737 com_softintr_scheduled = 1; 738 timeout(comsoft, NULL, 1); 739 } 740 #endif 741 #endif 742 } 743 744 void 745 com_break(sc, onoff) 746 struct com_softc *sc; 747 int onoff; 748 { 749 int s; 750 751 s = splserial(); 752 if (onoff) 753 SET(sc->sc_lcr, LCR_SBREAK); 754 else 755 CLR(sc->sc_lcr, LCR_SBREAK); 756 757 if (!sc->sc_heldchange) { 758 if (sc->sc_tx_busy) { 759 sc->sc_heldtbc = sc->sc_tbc; 760 sc->sc_tbc = 0; 761 sc->sc_heldchange = 1; 762 } else 763 com_loadchannelregs(sc); 764 } 765 splx(s); 766 } 767 768 void 769 com_modem(sc, onoff) 770 struct com_softc *sc; 771 int onoff; 772 { 773 int s; 774 775 s = splserial(); 776 if (onoff) 777 SET(sc->sc_mcr, sc->sc_mcr_dtr); 778 else 779 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 780 781 if (!sc->sc_heldchange) { 782 if (sc->sc_tx_busy) { 783 sc->sc_heldtbc = sc->sc_tbc; 784 sc->sc_tbc = 0; 785 sc->sc_heldchange = 1; 786 } else 787 com_loadchannelregs(sc); 788 } 789 splx(s); 790 } 791 792 int 793 comparam(tp, t) 794 struct tty *tp; 795 struct termios *t; 796 { 797 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 798 int ospeed = comspeed(t->c_ospeed); 799 u_char lcr; 800 int s; 801 802 /* check requested parameters */ 803 if (ospeed < 0) 804 return (EINVAL); 805 if (t->c_ispeed && t->c_ispeed != t->c_ospeed) 806 return (EINVAL); 807 808 lcr = ISSET(sc->sc_lcr, LCR_SBREAK); 809 810 switch (ISSET(t->c_cflag, CSIZE)) { 811 case CS5: 812 SET(lcr, LCR_5BITS); 813 break; 814 case CS6: 815 SET(lcr, LCR_6BITS); 816 break; 817 case CS7: 818 SET(lcr, LCR_7BITS); 819 break; 820 case CS8: 821 SET(lcr, LCR_8BITS); 822 break; 823 } 824 if (ISSET(t->c_cflag, PARENB)) { 825 SET(lcr, LCR_PENAB); 826 if (!ISSET(t->c_cflag, PARODD)) 827 SET(lcr, LCR_PEVEN); 828 } 829 if (ISSET(t->c_cflag, CSTOPB)) 830 SET(lcr, LCR_STOPB); 831 832 s = splserial(); 833 834 sc->sc_lcr = lcr; 835 836 /* 837 * For the console, always force CLOCAL and !HUPCL, so that the port 838 * is always active. 839 */ 840 if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) || 841 ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 842 SET(t->c_cflag, CLOCAL); 843 CLR(t->c_cflag, HUPCL); 844 } 845 846 /* 847 * If we're not in a mode that assumes a connection is present, then 848 * ignore carrier changes. 849 */ 850 if (ISSET(t->c_cflag, CLOCAL | MDMBUF)) 851 sc->sc_msr_dcd = 0; 852 else 853 sc->sc_msr_dcd = MSR_DCD; 854 /* 855 * Set the flow control pins depending on the current flow control 856 * mode. 857 */ 858 if (ISSET(t->c_cflag, CRTSCTS)) { 859 sc->sc_mcr_dtr = MCR_DTR; 860 sc->sc_mcr_rts = MCR_RTS; 861 sc->sc_msr_cts = MSR_CTS; 862 sc->sc_r_hiwat = RXHIWAT; 863 sc->sc_r_lowat = RXLOWAT; 864 } else if (ISSET(t->c_cflag, MDMBUF)) { 865 /* 866 * For DTR/DCD flow control, make sure we don't toggle DTR for 867 * carrier detection. 868 */ 869 sc->sc_mcr_dtr = 0; 870 sc->sc_mcr_rts = MCR_DTR; 871 sc->sc_msr_cts = MSR_DCD; 872 sc->sc_r_hiwat = RXHIWAT; 873 sc->sc_r_lowat = RXLOWAT; 874 } else { 875 /* 876 * If no flow control, then always set RTS. This will make 877 * the other side happy if it mistakenly thinks we're doing 878 * RTS/CTS flow control. 879 */ 880 sc->sc_mcr_dtr = MCR_DTR | MCR_RTS; 881 sc->sc_mcr_rts = 0; 882 sc->sc_msr_cts = 0; 883 sc->sc_r_hiwat = 0; 884 sc->sc_r_lowat = 0; 885 if (ISSET(sc->sc_mcr, MCR_DTR)) 886 SET(sc->sc_mcr, MCR_RTS); 887 else 888 CLR(sc->sc_mcr, MCR_RTS); 889 } 890 sc->sc_msr_mask = sc->sc_msr_cts | sc->sc_msr_dcd; 891 892 #if 0 893 if (ospeed == 0) 894 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 895 else 896 SET(sc->sc_mcr, sc->sc_mcr_dtr); 897 #endif 898 899 sc->sc_dlbl = ospeed; 900 sc->sc_dlbh = ospeed >> 8; 901 902 /* 903 * Set the FIFO threshold based on the receive speed. 904 * 905 * * If it's a low speed, it's probably a mouse or some other 906 * interactive device, so set the threshold low. 907 * * If it's a high speed, trim the trigger level down to prevent 908 * overflows. 909 * * Otherwise set it a bit higher. 910 */ 911 if (ISSET(sc->sc_hwflags, COM_HW_HAYESP)) 912 sc->sc_fifo = FIFO_DMA_MODE | FIFO_ENABLE | FIFO_TRIGGER_8; 913 else if (ISSET(sc->sc_hwflags, COM_HW_FIFO)) 914 sc->sc_fifo = FIFO_ENABLE | 915 (t->c_ospeed <= 1200 ? FIFO_TRIGGER_1 : 916 t->c_ospeed <= 38400 ? FIFO_TRIGGER_8 : FIFO_TRIGGER_4); 917 else 918 sc->sc_fifo = 0; 919 920 /* and copy to tty */ 921 tp->t_ispeed = 0; 922 tp->t_ospeed = t->c_ospeed; 923 tp->t_cflag = t->c_cflag; 924 925 if (!sc->sc_heldchange) { 926 if (sc->sc_tx_busy) { 927 sc->sc_heldtbc = sc->sc_tbc; 928 sc->sc_tbc = 0; 929 sc->sc_heldchange = 1; 930 } else 931 com_loadchannelregs(sc); 932 } 933 934 splx(s); 935 936 /* 937 * Update the tty layer's idea of the carrier bit, in case we changed 938 * CLOCAL or MDMBUF. We don't hang up here; we only do that if we 939 * lose carrier while carrier detection is on. 940 */ 941 (void) (*linesw[tp->t_line].l_modem)(tp, ISSET(sc->sc_msr, MSR_DCD)); 942 943 #ifdef COM_DEBUG 944 if (com_debug) 945 comstatus(sc, "comparam "); 946 #endif 947 948 /* Block or unblock as needed. */ 949 if (!ISSET(t->c_cflag, CHWFLOW)) { 950 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 951 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 952 com_schedrx(sc); 953 } 954 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 955 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 956 com_hwiflow(sc); 957 } 958 if (sc->sc_tx_stopped) { 959 sc->sc_tx_stopped = 0; 960 comstart(tp); 961 } 962 } else { 963 /* XXXXX FIX ME */ 964 #if 0 965 commsrint(sc, tp); 966 #endif 967 } 968 969 return (0); 970 } 971 972 void 973 com_iflush(sc) 974 struct com_softc *sc; 975 { 976 bus_space_tag_t iot = sc->sc_iot; 977 bus_space_handle_t ioh = sc->sc_ioh; 978 979 /* flush any pending I/O */ 980 while (ISSET(bus_space_read_1(iot, ioh, com_lsr), LSR_RXRDY)) 981 (void) bus_space_read_1(iot, ioh, com_data); 982 } 983 984 void 985 com_loadchannelregs(sc) 986 struct com_softc *sc; 987 { 988 bus_space_tag_t iot = sc->sc_iot; 989 bus_space_handle_t ioh = sc->sc_ioh; 990 991 /* XXXXX necessary? */ 992 com_iflush(sc); 993 994 bus_space_write_1(iot, ioh, com_ier, 0); 995 996 bus_space_write_1(iot, ioh, com_lcr, sc->sc_lcr | LCR_DLAB); 997 bus_space_write_1(iot, ioh, com_dlbl, sc->sc_dlbl); 998 bus_space_write_1(iot, ioh, com_dlbh, sc->sc_dlbh); 999 bus_space_write_1(iot, ioh, com_lcr, sc->sc_lcr); 1000 bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr_active = sc->sc_mcr); 1001 bus_space_write_1(iot, ioh, com_fifo, sc->sc_fifo); 1002 1003 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1004 } 1005 1006 int 1007 comhwiflow(tp, block) 1008 struct tty *tp; 1009 int block; 1010 { 1011 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1012 int s; 1013 1014 if (sc->sc_mcr_rts == 0) 1015 return (0); 1016 1017 s = splserial(); 1018 if (block) { 1019 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1020 SET(sc->sc_rx_flags, RX_TTY_BLOCKED); 1021 com_hwiflow(sc); 1022 } 1023 } else { 1024 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1025 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1026 com_schedrx(sc); 1027 } 1028 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1029 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED); 1030 com_hwiflow(sc); 1031 } 1032 } 1033 splx(s); 1034 return (1); 1035 } 1036 1037 /* 1038 * (un)block input via hw flowcontrol 1039 */ 1040 void 1041 com_hwiflow(sc) 1042 struct com_softc *sc; 1043 { 1044 bus_space_tag_t iot = sc->sc_iot; 1045 bus_space_handle_t ioh = sc->sc_ioh; 1046 1047 if (sc->sc_mcr_rts == 0) 1048 return; 1049 1050 if (ISSET(sc->sc_rx_flags, RX_ANY_BLOCK)) { 1051 CLR(sc->sc_mcr, sc->sc_mcr_rts); 1052 CLR(sc->sc_mcr_active, sc->sc_mcr_rts); 1053 } else { 1054 SET(sc->sc_mcr, sc->sc_mcr_rts); 1055 SET(sc->sc_mcr_active, sc->sc_mcr_rts); 1056 } 1057 bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr_active); 1058 } 1059 1060 1061 void 1062 comstart(tp) 1063 struct tty *tp; 1064 { 1065 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1066 bus_space_tag_t iot = sc->sc_iot; 1067 bus_space_handle_t ioh = sc->sc_ioh; 1068 int s; 1069 1070 s = spltty(); 1071 if (ISSET(tp->t_state, TS_BUSY)) 1072 goto out; 1073 if (ISSET(tp->t_state, TS_TIMEOUT | TS_TTSTOP)) 1074 goto stopped; 1075 1076 if (sc->sc_tx_stopped) 1077 goto stopped; 1078 1079 if (tp->t_outq.c_cc <= tp->t_lowat) { 1080 if (ISSET(tp->t_state, TS_ASLEEP)) { 1081 CLR(tp->t_state, TS_ASLEEP); 1082 wakeup(&tp->t_outq); 1083 } 1084 selwakeup(&tp->t_wsel); 1085 if (tp->t_outq.c_cc == 0) 1086 goto stopped; 1087 } 1088 1089 /* Grab the first contiguous region of buffer space. */ 1090 { 1091 u_char *tba; 1092 int tbc; 1093 1094 tba = tp->t_outq.c_cf; 1095 tbc = ndqb(&tp->t_outq, 0); 1096 1097 (void)splserial(); 1098 1099 sc->sc_tba = tba; 1100 sc->sc_tbc = tbc; 1101 } 1102 1103 SET(tp->t_state, TS_BUSY); 1104 sc->sc_tx_busy = 1; 1105 1106 /* Enable transmit completion interrupts if necessary. */ 1107 if (!ISSET(sc->sc_ier, IER_ETXRDY)) { 1108 SET(sc->sc_ier, IER_ETXRDY); 1109 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1110 } 1111 1112 /* Output the first chunk of the contiguous buffer. */ 1113 { 1114 int n; 1115 1116 n = sc->sc_fifolen; 1117 if (n > sc->sc_tbc) 1118 n = sc->sc_tbc; 1119 bus_space_write_multi_1(iot, ioh, com_data, sc->sc_tba, n); 1120 sc->sc_tbc -= n; 1121 sc->sc_tba += n; 1122 } 1123 splx(s); 1124 return; 1125 1126 stopped: 1127 /* Disable transmit completion interrupts if necessary. */ 1128 if (ISSET(sc->sc_ier, IER_ETXRDY)) { 1129 CLR(sc->sc_ier, IER_ETXRDY); 1130 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1131 } 1132 out: 1133 splx(s); 1134 return; 1135 } 1136 1137 /* 1138 * Stop output on a line. 1139 */ 1140 void 1141 comstop(tp, flag) 1142 struct tty *tp; 1143 int flag; 1144 { 1145 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1146 int s; 1147 1148 s = splserial(); 1149 if (ISSET(tp->t_state, TS_BUSY)) { 1150 /* Stop transmitting at the next chunk. */ 1151 sc->sc_tbc = 0; 1152 sc->sc_heldtbc = 0; 1153 if (!ISSET(tp->t_state, TS_TTSTOP)) 1154 SET(tp->t_state, TS_FLUSH); 1155 } 1156 splx(s); 1157 } 1158 1159 void 1160 comdiag(arg) 1161 void *arg; 1162 { 1163 struct com_softc *sc = arg; 1164 int overflows, floods; 1165 int s; 1166 1167 s = splserial(); 1168 overflows = sc->sc_overflows; 1169 sc->sc_overflows = 0; 1170 floods = sc->sc_floods; 1171 sc->sc_floods = 0; 1172 sc->sc_errors = 0; 1173 splx(s); 1174 1175 log(LOG_WARNING, 1176 "%s: %d silo overflow%s, %d ibuf flood%s\n", 1177 sc->sc_dev.dv_xname, 1178 overflows, overflows == 1 ? "" : "s", 1179 floods, floods == 1 ? "" : "s"); 1180 } 1181 1182 integrate void 1183 comrxint(sc, tp) 1184 struct com_softc *sc; 1185 struct tty *tp; 1186 { 1187 u_int get, cc, scc; 1188 int code; 1189 u_char lsr; 1190 int s; 1191 static int lsrmap[8] = { 1192 0, TTY_PE, 1193 TTY_FE, TTY_PE|TTY_FE, 1194 TTY_FE, TTY_PE|TTY_FE, 1195 TTY_FE, TTY_PE|TTY_FE 1196 }; 1197 1198 get = sc->sc_rbget; 1199 scc = cc = RXBUFSIZE - sc->sc_rbavail; 1200 1201 if (cc == RXBUFSIZE) { 1202 sc->sc_floods++; 1203 if (sc->sc_errors++ == 0) 1204 timeout(comdiag, sc, 60 * hz); 1205 } 1206 1207 while (cc) { 1208 lsr = sc->sc_lbuf[get]; 1209 if (ISSET(lsr, LSR_BI)) { 1210 #ifdef DDB 1211 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) 1212 Debugger(); 1213 #endif 1214 } 1215 else if (ISSET(lsr, LSR_OE)) { 1216 sc->sc_overflows++; 1217 if (sc->sc_errors++ == 0) 1218 timeout(comdiag, sc, 60 * hz); 1219 } 1220 code = sc->sc_rbuf[get] | 1221 lsrmap[(lsr & (LSR_BI|LSR_FE|LSR_PE)) >> 2]; 1222 if ((*linesw[tp->t_line].l_rint)(code, tp) == -1) { 1223 /* 1224 * The line discipline's buffer is out of space. 1225 */ 1226 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1227 /* 1228 * We're either not using flow control, or the 1229 * line discipline didn't tell us to block for 1230 * some reason. Either way, we have no way to 1231 * know when there's more space available, so 1232 * just drop the rest of the data. 1233 */ 1234 get = (get + cc) & RXBUFMASK; 1235 cc = 0; 1236 } else { 1237 /* 1238 * Don't schedule any more receive processing 1239 * until the line discipline tells us there's 1240 * space available (through comhwiflow()). 1241 * Leave the rest of the data in the input 1242 * buffer. 1243 */ 1244 SET(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1245 } 1246 break; 1247 } 1248 get = (get + 1) & RXBUFMASK; 1249 cc--; 1250 } 1251 1252 if (cc != scc) { 1253 sc->sc_rbget = get; 1254 s = splserial(); 1255 cc = sc->sc_rbavail += scc - cc; 1256 /* Buffers should be ok again, release possible block. */ 1257 if (cc >= sc->sc_r_lowat) { 1258 if (ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1259 CLR(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1260 SET(sc->sc_ier, IER_ERXRDY); 1261 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 1262 } 1263 if (ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED)) { 1264 CLR(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1265 com_hwiflow(sc); 1266 } 1267 } 1268 splx(s); 1269 } 1270 } 1271 1272 integrate void 1273 comtxint(sc, tp) 1274 struct com_softc *sc; 1275 struct tty *tp; 1276 { 1277 1278 CLR(tp->t_state, TS_BUSY); 1279 if (ISSET(tp->t_state, TS_FLUSH)) 1280 CLR(tp->t_state, TS_FLUSH); 1281 else 1282 ndflush(&tp->t_outq, (int)(sc->sc_tba - tp->t_outq.c_cf)); 1283 (*linesw[tp->t_line].l_start)(tp); 1284 } 1285 1286 integrate void 1287 commsrint(sc, tp) 1288 struct com_softc *sc; 1289 struct tty *tp; 1290 { 1291 u_char msr, delta; 1292 int s; 1293 1294 s = splserial(); 1295 msr = sc->sc_msr; 1296 delta = sc->sc_msr_delta; 1297 sc->sc_msr_delta = 0; 1298 splx(s); 1299 1300 if (ISSET(delta, sc->sc_msr_dcd)) { 1301 /* 1302 * Inform the tty layer that carrier detect changed. 1303 */ 1304 (void) (*linesw[tp->t_line].l_modem)(tp, ISSET(msr, MSR_DCD)); 1305 } 1306 1307 if (ISSET(delta, sc->sc_msr_cts)) { 1308 /* Block or unblock output according to flow control. */ 1309 if (ISSET(msr, sc->sc_msr_cts)) { 1310 sc->sc_tx_stopped = 0; 1311 (*linesw[tp->t_line].l_start)(tp); 1312 } else { 1313 sc->sc_tx_stopped = 1; 1314 } 1315 } 1316 1317 #ifdef COM_DEBUG 1318 if (com_debug) 1319 comstatus(sc, "commsrint"); 1320 #endif 1321 } 1322 1323 #ifdef __GENERIC_SOFT_INTERRUPTS 1324 void 1325 comsoft(arg) 1326 void *arg; 1327 { 1328 struct com_softc *sc = arg; 1329 struct tty *tp; 1330 1331 { 1332 #else 1333 void 1334 #ifndef alpha 1335 comsoft() 1336 #else 1337 comsoft(arg) 1338 void *arg; 1339 #endif 1340 { 1341 struct com_softc *sc; 1342 struct tty *tp; 1343 int unit; 1344 #ifdef alpha 1345 int s; 1346 1347 s = splsoftserial(); 1348 com_softintr_scheduled = 0; 1349 #endif 1350 1351 for (unit = 0; unit < com_cd.cd_ndevs; unit++) { 1352 sc = com_cd.cd_devs[unit]; 1353 if (sc == NULL) 1354 continue; 1355 #endif 1356 1357 tp = sc->sc_tty; 1358 if (tp == NULL || !ISSET(tp->t_state, TS_ISOPEN | TS_WOPEN)) 1359 continue; 1360 1361 if (sc->sc_rx_ready) { 1362 sc->sc_rx_ready = 0; 1363 comrxint(sc, tp); 1364 } 1365 1366 if (sc->sc_st_check) { 1367 sc->sc_st_check = 0; 1368 commsrint(sc, tp); 1369 } 1370 1371 if (sc->sc_tx_done) { 1372 sc->sc_tx_done = 0; 1373 comtxint(sc, tp); 1374 } 1375 } 1376 1377 #ifndef __GENERIC_SOFT_INTERRUPTS 1378 #ifdef alpha 1379 splx(s); 1380 #endif 1381 #endif 1382 } 1383 1384 int 1385 comintr(arg) 1386 void *arg; 1387 { 1388 struct com_softc *sc = arg; 1389 bus_space_tag_t iot = sc->sc_iot; 1390 bus_space_handle_t ioh = sc->sc_ioh; 1391 u_char lsr, iir; 1392 u_int put, cc; 1393 1394 iir = bus_space_read_1(iot, ioh, com_iir); 1395 if (ISSET(iir, IIR_NOPEND)) 1396 return (0); 1397 1398 put = sc->sc_rbput; 1399 cc = sc->sc_rbavail; 1400 1401 do { 1402 u_char msr, delta; 1403 1404 lsr = bus_space_read_1(iot, ioh, com_lsr); 1405 if (ISSET(lsr, LSR_RCV_MASK) && 1406 !ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1407 for (; ISSET(lsr, LSR_RCV_MASK) && cc > 0; cc--) { 1408 sc->sc_rbuf[put] = 1409 bus_space_read_1(iot, ioh, com_data); 1410 sc->sc_lbuf[put] = lsr; 1411 put = (put + 1) & RXBUFMASK; 1412 lsr = bus_space_read_1(iot, ioh, com_lsr); 1413 } 1414 /* 1415 * Current string of incoming characters ended because 1416 * no more data was available. Schedule a receive event 1417 * if any data was received. Drop any characters that 1418 * we couldn't handle. 1419 */ 1420 sc->sc_rbput = put; 1421 sc->sc_rbavail = cc; 1422 if (!ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) 1423 sc->sc_rx_ready = 1; 1424 /* 1425 * See if we are in danger of overflowing a buffer. If 1426 * so, use hardware flow control to ease the pressure. 1427 */ 1428 if (!ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED) && 1429 cc < sc->sc_r_hiwat) { 1430 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1431 com_hwiflow(sc); 1432 } 1433 /* 1434 * If we're out of space, disable receive interrupts 1435 * until the queue has drained a bit. 1436 */ 1437 if (!cc) { 1438 SET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1439 CLR(sc->sc_ier, IER_ERXRDY); 1440 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1441 } 1442 } else { 1443 if ((iir & IIR_IMASK) == IIR_RXRDY) { 1444 bus_space_write_1(iot, ioh, com_ier, 0); 1445 delay(10); 1446 bus_space_write_1(iot, ioh, com_ier,sc->sc_ier); 1447 iir = IIR_NOPEND; 1448 continue; 1449 } 1450 } 1451 1452 msr = bus_space_read_1(iot, ioh, com_msr); 1453 delta = msr ^ sc->sc_msr; 1454 sc->sc_msr = msr; 1455 if (ISSET(delta, sc->sc_msr_mask)) { 1456 sc->sc_msr_delta |= delta; 1457 1458 /* 1459 * Stop output immediately if we lose the output 1460 * flow control signal or carrier detect. 1461 */ 1462 if (ISSET(~msr, sc->sc_msr_mask)) { 1463 sc->sc_tbc = 0; 1464 sc->sc_heldtbc = 0; 1465 #ifdef COM_DEBUG 1466 if (com_debug) 1467 comstatus(sc, "comintr "); 1468 #endif 1469 } 1470 1471 sc->sc_st_check = 1; 1472 } 1473 } while (!ISSET((iir = bus_space_read_1(iot, ioh, com_iir)), IIR_NOPEND)); 1474 1475 /* 1476 * Done handling any receive interrupts. See if data can be 1477 * transmitted as well. Schedule tx done event if no data left 1478 * and tty was marked busy. 1479 */ 1480 if (ISSET(lsr, LSR_TXRDY)) { 1481 /* 1482 * If we've delayed a parameter change, do it now, and restart 1483 * output. 1484 */ 1485 if (sc->sc_heldchange) { 1486 com_loadchannelregs(sc); 1487 sc->sc_heldchange = 0; 1488 sc->sc_tbc = sc->sc_heldtbc; 1489 sc->sc_heldtbc = 0; 1490 } 1491 /* Output the next chunk of the contiguous buffer, if any. */ 1492 if (sc->sc_tbc > 0) { 1493 int n; 1494 1495 n = sc->sc_fifolen; 1496 if (n > sc->sc_tbc) 1497 n = sc->sc_tbc; 1498 bus_space_write_multi_1(iot, ioh, com_data, sc->sc_tba, n); 1499 sc->sc_tbc -= n; 1500 sc->sc_tba += n; 1501 } else if (sc->sc_tx_busy) { 1502 sc->sc_tx_busy = 0; 1503 sc->sc_tx_done = 1; 1504 } 1505 } 1506 1507 /* Wake up the poller. */ 1508 #ifdef __GENERIC_SOFT_INTERRUPTS 1509 softintr_schedule(sc->sc_si); 1510 #else 1511 #ifndef alpha 1512 setsoftserial(); 1513 #else 1514 if (!com_softintr_scheduled) { 1515 com_softintr_scheduled = 1; 1516 timeout(comsoft, NULL, 1); 1517 } 1518 #endif 1519 #endif 1520 return (1); 1521 } 1522 1523 /* 1524 * Following are all routines needed for COM to act as console 1525 */ 1526 #include <dev/cons.h> 1527 1528 void 1529 comcnprobe(cp) 1530 struct consdev *cp; 1531 { 1532 /* XXX NEEDS TO BE FIXED XXX */ 1533 bus_space_tag_t iot = 0; 1534 bus_space_handle_t ioh; 1535 int found; 1536 1537 if (bus_space_map(iot, CONADDR, COM_NPORTS, 0, &ioh)) { 1538 cp->cn_pri = CN_DEAD; 1539 return; 1540 } 1541 found = comprobe1(iot, ioh, CONADDR); 1542 bus_space_unmap(iot, ioh, COM_NPORTS); 1543 if (!found) { 1544 cp->cn_pri = CN_DEAD; 1545 return; 1546 } 1547 1548 /* locate the major number */ 1549 for (commajor = 0; commajor < nchrdev; commajor++) 1550 if (cdevsw[commajor].d_open == comopen) 1551 break; 1552 1553 /* initialize required fields */ 1554 cp->cn_dev = makedev(commajor, CONUNIT); 1555 #ifdef COMCONSOLE 1556 cp->cn_pri = CN_REMOTE; /* Force a serial port console */ 1557 #else 1558 cp->cn_pri = CN_NORMAL; 1559 #endif 1560 } 1561 1562 void 1563 comcninit(cp) 1564 struct consdev *cp; 1565 { 1566 1567 #if 0 1568 XXX NEEDS TO BE FIXED XXX 1569 comconstag = ???; 1570 #endif 1571 if (bus_space_map(comconstag, CONADDR, COM_NPORTS, 0, &comconsioh)) 1572 panic("comcninit: mapping failed"); 1573 1574 cominitcons(comconstag, comconsioh, comconsrate); 1575 comconsaddr = CONADDR; 1576 } 1577 1578 /* 1579 * Initialize UART to known state. 1580 */ 1581 void 1582 cominit(iot, ioh, rate) 1583 bus_space_tag_t iot; 1584 bus_space_handle_t ioh; 1585 int rate; 1586 { 1587 1588 bus_space_write_1(iot, ioh, com_lcr, LCR_DLAB); 1589 rate = comspeed(rate); 1590 bus_space_write_1(iot, ioh, com_dlbl, rate); 1591 bus_space_write_1(iot, ioh, com_dlbh, rate >> 8); 1592 bus_space_write_1(iot, ioh, com_lcr, LCR_8BITS); 1593 bus_space_write_1(iot, ioh, com_mcr, 0); 1594 bus_space_write_1(iot, ioh, com_fifo, 1595 FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_1); 1596 bus_space_write_1(iot, ioh, com_ier, 0); 1597 } 1598 1599 /* 1600 * Set UART for console use. Do normal init, then enable interrupts. 1601 */ 1602 void 1603 cominitcons(iot, ioh, rate) 1604 bus_space_tag_t iot; 1605 bus_space_handle_t ioh; 1606 int rate; 1607 { 1608 int s = splserial(); 1609 u_char stat; 1610 1611 cominit(iot, ioh, rate); 1612 bus_space_write_1(iot, ioh, com_ier, IER_ERXRDY | IER_ETXRDY); 1613 bus_space_write_1(iot, ioh, com_mcr, MCR_DTR | MCR_RTS); 1614 DELAY(100); 1615 stat = bus_space_read_1(iot, ioh, com_iir); 1616 splx(s); 1617 } 1618 1619 int 1620 comcngetc(dev) 1621 dev_t dev; 1622 { 1623 int s = splserial(); 1624 bus_space_tag_t iot = comconstag; 1625 bus_space_handle_t ioh = comconsioh; 1626 u_char stat, c; 1627 1628 while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_RXRDY)) 1629 ; 1630 c = bus_space_read_1(iot, ioh, com_data); 1631 stat = bus_space_read_1(iot, ioh, com_iir); 1632 splx(s); 1633 return (c); 1634 } 1635 1636 /* 1637 * Console kernel output character routine. 1638 */ 1639 void 1640 comcnputc(dev, c) 1641 dev_t dev; 1642 int c; 1643 { 1644 int s = splserial(); 1645 bus_space_tag_t iot = comconstag; 1646 bus_space_handle_t ioh = comconsioh; 1647 u_char stat; 1648 register int timo; 1649 1650 /* wait for any pending transmission to finish */ 1651 timo = 50000; 1652 while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_TXRDY) && --timo) 1653 ; 1654 bus_space_write_1(iot, ioh, com_data, c); 1655 /* wait for this transmission to complete */ 1656 timo = 1500000; 1657 while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_TXRDY) && --timo) 1658 ; 1659 /* clear any interrupts generated by this transmission */ 1660 stat = bus_space_read_1(iot, ioh, com_iir); 1661 splx(s); 1662 } 1663 1664 void 1665 comcnpollc(dev, on) 1666 dev_t dev; 1667 int on; 1668 { 1669 1670 } 1671
Indexes created Tue Sep 23 07:09:52 GMT 2025