com.c revision 1.108
1 /* $NetBSD: com.c,v 1.108 1997/08/27 18:00:13 is 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 #include <dev/cons.h> 100 101 #include "com.h" 102 103 #ifdef COM_HAYESP 104 int comprobeHAYESP __P((bus_space_handle_t hayespioh, struct com_softc *sc)); 105 #endif 106 107 #if defined(DDB) || defined(KGDB) 108 static void com_enable_debugport __P((struct com_softc *)); 109 #endif 110 void com_attach_subr __P((struct com_softc *sc)); 111 void comdiag __P((void *)); 112 int comspeed __P((long)); 113 static u_char cflag2lcr __P((tcflag_t)); 114 int comparam __P((struct tty *, struct termios *)); 115 void comstart __P((struct tty *)); 116 void comstop __P((struct tty *, int)); 117 #ifdef __GENERIC_SOFT_INTERRUPTS 118 void comsoft __P((void *)); 119 #else 120 #ifndef alpha 121 void comsoft __P((void)); 122 #else 123 void comsoft __P((void *)); 124 #endif 125 #endif 126 int comhwiflow __P((struct tty *, int)); 127 128 void com_loadchannelregs __P((struct com_softc *)); 129 void com_hwiflow __P((struct com_softc *)); 130 void com_break __P((struct com_softc *, int)); 131 void com_modem __P((struct com_softc *, int)); 132 void com_iflush __P((struct com_softc *)); 133 134 int com_common_getc __P((bus_space_tag_t, bus_space_handle_t)); 135 void com_common_putc __P((bus_space_tag_t, bus_space_handle_t, int)); 136 137 /* XXX: These belong elsewhere */ 138 cdev_decl(com); 139 bdev_decl(com); 140 141 int comcngetc __P((dev_t)); 142 void comcnputc __P((dev_t, int)); 143 void comcnpollc __P((dev_t, int)); 144 145 #define integrate static inline 146 integrate void comrxint __P((struct com_softc *, struct tty *)); 147 integrate void comtxint __P((struct com_softc *, struct tty *)); 148 integrate void commsrint __P((struct com_softc *, struct tty *)); 149 integrate void com_schedrx __P((struct com_softc *)); 150 151 struct cfdriver com_cd = { 152 NULL, "com", DV_TTY 153 }; 154 155 static int comconsaddr; 156 static bus_space_tag_t comconstag; 157 static bus_space_handle_t comconsioh; 158 static int comconsattached; 159 static int comconsrate; 160 static tcflag_t comconscflag; 161 162 #ifndef __GENERIC_SOFT_INTERRUPTS 163 #ifdef alpha 164 volatile int com_softintr_scheduled; 165 #endif 166 #endif 167 168 #ifdef KGDB 169 #include <sys/kgdb.h> 170 171 static int com_kgdb_addr; 172 static bus_space_tag_t com_kgdb_iot; 173 static bus_space_handle_t com_kgdb_ioh; 174 static int com_kgdb_attached; 175 176 int com_kgdb_getc __P((void *)); 177 void com_kgdb_putc __P((void *, int)); 178 #endif /* KGDB */ 179 180 #define COMUNIT(x) (minor(x)) 181 182 int 183 comspeed(speed) 184 long speed; 185 { 186 #define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */ 187 188 int x, err; 189 190 #if 0 191 if (speed == 0) 192 return (0); 193 #endif 194 if (speed <= 0) 195 return (-1); 196 x = divrnd((COM_FREQ / 16), speed); 197 if (x <= 0) 198 return (-1); 199 err = divrnd((COM_FREQ / 16) * 1000, speed * x) - 1000; 200 if (err < 0) 201 err = -err; 202 if (err > COM_TOLERANCE) 203 return (-1); 204 return (x); 205 206 #undef divrnd(n, q) 207 } 208 209 #ifdef COM_DEBUG 210 int com_debug = 0; 211 212 void comstatus __P((struct com_softc *, char *)); 213 void 214 comstatus(sc, str) 215 struct com_softc *sc; 216 char *str; 217 { 218 struct tty *tp = sc->sc_tty; 219 220 printf("%s: %s %sclocal %sdcd %sts_carr_on %sdtr %stx_stopped\n", 221 sc->sc_dev.dv_xname, str, 222 ISSET(tp->t_cflag, CLOCAL) ? "+" : "-", 223 ISSET(sc->sc_msr, MSR_DCD) ? "+" : "-", 224 ISSET(tp->t_state, TS_CARR_ON) ? "+" : "-", 225 ISSET(sc->sc_mcr, MCR_DTR) ? "+" : "-", 226 sc->sc_tx_stopped ? "+" : "-"); 227 228 printf("%s: %s %scrtscts %scts %sts_ttstop %srts %xrx_flags\n", 229 sc->sc_dev.dv_xname, str, 230 ISSET(tp->t_cflag, CRTSCTS) ? "+" : "-", 231 ISSET(sc->sc_msr, MSR_CTS) ? "+" : "-", 232 ISSET(tp->t_state, TS_TTSTOP) ? "+" : "-", 233 ISSET(sc->sc_mcr, MCR_RTS) ? "+" : "-", 234 sc->sc_rx_flags); 235 } 236 #endif 237 238 int 239 comprobe1(iot, ioh, iobase) 240 bus_space_tag_t iot; 241 bus_space_handle_t ioh; 242 int iobase; 243 { 244 245 /* force access to id reg */ 246 bus_space_write_1(iot, ioh, com_lcr, 0); 247 bus_space_write_1(iot, ioh, com_iir, 0); 248 if (bus_space_read_1(iot, ioh, com_iir) & 0x38) 249 return (0); 250 251 return (1); 252 } 253 254 #ifdef COM_HAYESP 255 int 256 comprobeHAYESP(hayespioh, sc) 257 bus_space_handle_t hayespioh; 258 struct com_softc *sc; 259 { 260 char val, dips; 261 int combaselist[] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8 }; 262 bus_space_tag_t iot = sc->sc_iot; 263 264 /* 265 * Hayes ESP cards have two iobases. One is for compatibility with 266 * 16550 serial chips, and at the same ISA PC base addresses. The 267 * other is for ESP-specific enhanced features, and lies at a 268 * different addressing range entirely (0x140, 0x180, 0x280, or 0x300). 269 */ 270 271 /* Test for ESP signature */ 272 if ((bus_space_read_1(iot, hayespioh, 0) & 0xf3) == 0) 273 return (0); 274 275 /* 276 * ESP is present at ESP enhanced base address; unknown com port 277 */ 278 279 /* Get the dip-switch configurations */ 280 bus_space_write_1(iot, hayespioh, HAYESP_CMD1, HAYESP_GETDIPS); 281 dips = bus_space_read_1(iot, hayespioh, HAYESP_STATUS1); 282 283 /* Determine which com port this ESP card services: bits 0,1 of */ 284 /* dips is the port # (0-3); combaselist[val] is the com_iobase */ 285 if (sc->sc_iobase != combaselist[dips & 0x03]) 286 return (0); 287 288 printf(": ESP"); 289 290 /* Check ESP Self Test bits. */ 291 /* Check for ESP version 2.0: bits 4,5,6 == 010 */ 292 bus_space_write_1(iot, hayespioh, HAYESP_CMD1, HAYESP_GETTEST); 293 val = bus_space_read_1(iot, hayespioh, HAYESP_STATUS1); /* Clear reg1 */ 294 val = bus_space_read_1(iot, hayespioh, HAYESP_STATUS2); 295 if ((val & 0x70) < 0x20) { 296 printf("-old (%o)", val & 0x70); 297 /* we do not support the necessary features */ 298 return (0); 299 } 300 301 /* Check for ability to emulate 16550: bit 8 == 1 */ 302 if ((dips & 0x80) == 0) { 303 printf(" slave"); 304 /* XXX Does slave really mean no 16550 support?? */ 305 return (0); 306 } 307 308 /* 309 * If we made it this far, we are a full-featured ESP v2.0 (or 310 * better), at the correct com port address. 311 */ 312 313 SET(sc->sc_hwflags, COM_HW_HAYESP); 314 printf(", 1024 byte fifo\n"); 315 return (1); 316 } 317 #endif 318 319 #if defined(DDB) || defined(KGDB) 320 static void 321 com_enable_debugport(sc) 322 struct com_softc *sc; 323 { 324 int s; 325 326 /* Turn on line break interrupt, set carrier. */ 327 s = splserial(); 328 sc->sc_ier = IER_ERXRDY; 329 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 330 SET(sc->sc_mcr, MCR_DTR | MCR_RTS); 331 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_mcr, sc->sc_mcr); 332 splx(s); 333 } 334 #endif 335 336 void 337 com_attach_subr(sc) 338 struct com_softc *sc; 339 { 340 int iobase = sc->sc_iobase; 341 bus_space_tag_t iot = sc->sc_iot; 342 bus_space_handle_t ioh = sc->sc_ioh; 343 #ifdef COM_HAYESP 344 int hayesp_ports[] = { 0x140, 0x180, 0x280, 0x300, 0 }; 345 int *hayespp; 346 #endif 347 348 if (iot == comconstag && iobase == comconsaddr) { 349 comconsattached = 1; 350 351 /* Make sure the console is always "hardwired". */ 352 delay(1000); /* wait for output to finish */ 353 SET(sc->sc_hwflags, COM_HW_CONSOLE); 354 SET(sc->sc_swflags, TIOCFLAG_SOFTCAR); 355 } 356 357 #ifdef COM_HAYESP 358 /* Look for a Hayes ESP board. */ 359 for (hayespp = hayesp_ports; *hayespp != 0; hayespp++) { 360 bus_space_handle_t hayespioh; 361 362 #define HAYESP_NPORTS 8 /* XXX XXX XXX ??? ??? ??? */ 363 if (bus_space_map(iot, *hayespp, HAYESP_NPORTS, 0, &hayespioh)) 364 continue; 365 if (comprobeHAYESP(hayespioh, sc)) { 366 sc->sc_hayespioh = hayespioh; 367 sc->sc_fifolen = 1024; 368 369 /* Set 16550 compatibility mode */ 370 bus_space_write_1(iot, hayespioh, HAYESP_CMD1, HAYESP_SETMODE); 371 bus_space_write_1(iot, hayespioh, HAYESP_CMD2, 372 HAYESP_MODE_FIFO|HAYESP_MODE_RTS| 373 HAYESP_MODE_SCALE); 374 375 /* Set RTS/CTS flow control */ 376 bus_space_write_1(iot, hayespioh, HAYESP_CMD1, HAYESP_SETFLOWTYPE); 377 bus_space_write_1(iot, hayespioh, HAYESP_CMD2, HAYESP_FLOW_RTS); 378 bus_space_write_1(iot, hayespioh, HAYESP_CMD2, HAYESP_FLOW_CTS); 379 380 /* Set flow control levels */ 381 bus_space_write_1(iot, hayespioh, HAYESP_CMD1, HAYESP_SETRXFLOW); 382 bus_space_write_1(iot, hayespioh, HAYESP_CMD2, 383 HAYESP_HIBYTE(HAYESP_RXHIWMARK)); 384 bus_space_write_1(iot, hayespioh, HAYESP_CMD2, 385 HAYESP_LOBYTE(HAYESP_RXHIWMARK)); 386 bus_space_write_1(iot, hayespioh, HAYESP_CMD2, 387 HAYESP_HIBYTE(HAYESP_RXLOWMARK)); 388 bus_space_write_1(iot, hayespioh, HAYESP_CMD2, 389 HAYESP_LOBYTE(HAYESP_RXLOWMARK)); 390 391 break; 392 } 393 bus_space_unmap(iot, hayespioh, HAYESP_NPORTS); 394 } 395 /* No ESP; look for other things. */ 396 if (*hayespp == 0) { 397 #endif 398 399 sc->sc_fifolen = 1; 400 /* look for a NS 16550AF UART with FIFOs */ 401 bus_space_write_1(iot, ioh, com_fifo, 402 FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_14); 403 delay(100); 404 if (ISSET(bus_space_read_1(iot, ioh, com_iir), IIR_FIFO_MASK) 405 == IIR_FIFO_MASK) 406 if (ISSET(bus_space_read_1(iot, ioh, com_fifo), FIFO_TRIGGER_14) 407 == FIFO_TRIGGER_14) { 408 SET(sc->sc_hwflags, COM_HW_FIFO); 409 printf(": ns16550a, working fifo\n"); 410 sc->sc_fifolen = 16; 411 } else 412 printf(": ns16550, broken fifo\n"); 413 else 414 printf(": ns8250 or ns16450, no fifo\n"); 415 bus_space_write_1(iot, ioh, com_fifo, 0); 416 #ifdef COM_HAYESP 417 } 418 #endif 419 420 if (!ISSET(sc->sc_hwflags, COM_HW_NOIEN)) 421 SET(sc->sc_mcr, MCR_IENABLE); 422 423 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 424 int maj; 425 426 /* locate the major number */ 427 for (maj = 0; maj < nchrdev; maj++) 428 if (cdevsw[maj].d_open == comopen) 429 break; 430 431 cn_tab->cn_dev = makedev(maj, sc->sc_dev.dv_unit); 432 #ifdef DDB 433 com_enable_debugport(sc); 434 #endif 435 printf("%s: console\n", sc->sc_dev.dv_xname); 436 } 437 438 #ifdef KGDB 439 /* 440 * Allow kgdb to "take over" this port. If this is 441 * the kgdb device, it has exclusive use. 442 */ 443 if (iot == com_kgdb_iot && iobase == com_kgdb_addr) { 444 com_kgdb_attached = 1; 445 446 SET(sc->sc_hwflags, COM_HW_KGDB); 447 com_enable_debugport(sc); 448 printf("%s: kgdb\n", sc->sc_dev.dv_xname); 449 } 450 #endif 451 452 #ifdef __GENERIC_SOFT_INTERRUPTS 453 sc->sc_si = softintr_establish(IPL_SOFTSERIAL, comsoft, sc); 454 #endif 455 } 456 457 int 458 comopen(dev, flag, mode, p) 459 dev_t dev; 460 int flag, mode; 461 struct proc *p; 462 { 463 int unit = COMUNIT(dev); 464 struct com_softc *sc; 465 struct tty *tp; 466 int s, s2; 467 int error = 0; 468 469 if (unit >= com_cd.cd_ndevs) 470 return (ENXIO); 471 sc = com_cd.cd_devs[unit]; 472 if (!sc) 473 return (ENXIO); 474 475 #ifdef KGDB 476 /* 477 * If this is the kgdb port, no other use is permitted. 478 */ 479 if (ISSET(sc->sc_hwflags, COM_HW_KGDB)) 480 return (EBUSY); 481 #endif 482 483 if (!sc->sc_tty) { 484 tp = sc->sc_tty = ttymalloc(); 485 tty_attach(tp); 486 } else 487 tp = sc->sc_tty; 488 489 if (ISSET(tp->t_state, TS_ISOPEN) && 490 ISSET(tp->t_state, TS_XCLUDE) && 491 p->p_ucred->cr_uid != 0) 492 return (EBUSY); 493 494 s = spltty(); 495 496 /* We need to set this early for the benefit of comsoft(). */ 497 SET(tp->t_state, TS_WOPEN); 498 499 /* 500 * Do the following iff this is a first open. 501 */ 502 if (!ISSET(tp->t_state, TS_ISOPEN)) { 503 struct termios t; 504 505 /* Turn on interrupts. */ 506 sc->sc_ier = IER_ERXRDY | IER_ERLS | IER_EMSC; 507 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 508 509 /* Fetch the current modem control status, needed later. */ 510 sc->sc_msr = bus_space_read_1(sc->sc_iot, sc->sc_ioh, com_msr); 511 512 /* Add some entry points needed by the tty layer. */ 513 tp->t_oproc = comstart; 514 tp->t_param = comparam; 515 tp->t_hwiflow = comhwiflow; 516 tp->t_dev = dev; 517 518 /* 519 * Initialize the termios status to the defaults. Add in the 520 * sticky bits from TIOCSFLAGS. 521 */ 522 t.c_ispeed = 0; 523 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 524 t.c_ospeed = comconsrate; 525 t.c_cflag = comconscflag; 526 } else { 527 t.c_ospeed = TTYDEF_SPEED; 528 t.c_cflag = TTYDEF_CFLAG; 529 } 530 if (ISSET(sc->sc_swflags, TIOCFLAG_CLOCAL)) 531 SET(t.c_cflag, CLOCAL); 532 if (ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS)) 533 SET(t.c_cflag, CRTSCTS); 534 if (ISSET(sc->sc_swflags, TIOCFLAG_MDMBUF)) 535 SET(t.c_cflag, MDMBUF); 536 tp->t_iflag = TTYDEF_IFLAG; 537 tp->t_oflag = TTYDEF_OFLAG; 538 tp->t_lflag = TTYDEF_LFLAG; 539 ttychars(tp); 540 (void) comparam(tp, &t); 541 ttsetwater(tp); 542 543 s2 = splserial(); 544 545 /* 546 * Turn on DTR. We must always do this, even if carrier is not 547 * present, because otherwise we'd have to use TIOCSDTR 548 * immediately after setting CLOCAL. We will drop DTR only on 549 * the next high-low transition of DCD, or by explicit request. 550 */ 551 com_modem(sc, 1); 552 553 /* Clear the input ring, and unblock. */ 554 sc->sc_rbput = sc->sc_rbget = 0; 555 sc->sc_rbavail = RXBUFSIZE; 556 com_iflush(sc); 557 CLR(sc->sc_rx_flags, RX_ANY_BLOCK); 558 com_hwiflow(sc); 559 560 #ifdef COM_DEBUG 561 if (com_debug) 562 comstatus(sc, "comopen "); 563 #endif 564 565 splx(s2); 566 } 567 error = 0; 568 569 /* If we're doing a blocking open... */ 570 if (!ISSET(flag, O_NONBLOCK)) 571 /* ...then wait for carrier. */ 572 while (!ISSET(tp->t_state, TS_CARR_ON) && 573 !ISSET(tp->t_cflag, CLOCAL | MDMBUF)) { 574 error = ttysleep(tp, &tp->t_rawq, TTIPRI | PCATCH, 575 ttopen, 0); 576 if (error) { 577 /* 578 * If the open was interrupted and nobody 579 * else has the device open, then hang up. 580 */ 581 if (!ISSET(tp->t_state, TS_ISOPEN)) { 582 com_modem(sc, 0); 583 CLR(tp->t_state, TS_WOPEN); 584 ttwakeup(tp); 585 } 586 break; 587 } 588 SET(tp->t_state, TS_WOPEN); 589 } 590 591 splx(s); 592 if (error == 0) 593 error = (*linesw[tp->t_line].l_open)(dev, tp); 594 return (error); 595 } 596 597 int 598 comclose(dev, flag, mode, p) 599 dev_t dev; 600 int flag, mode; 601 struct proc *p; 602 { 603 int unit = COMUNIT(dev); 604 struct com_softc *sc = com_cd.cd_devs[unit]; 605 struct tty *tp = sc->sc_tty; 606 int s; 607 608 /* XXX This is for cons.c. */ 609 if (!ISSET(tp->t_state, TS_ISOPEN)) 610 return (0); 611 612 (*linesw[tp->t_line].l_close)(tp, flag); 613 ttyclose(tp); 614 615 /* If we were asserting flow control, then deassert it. */ 616 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 617 com_hwiflow(sc); 618 /* Clear any break condition set with TIOCSBRK. */ 619 com_break(sc, 0); 620 /* 621 * Hang up if necessary. Wait a bit, so the other side has time to 622 * notice even if we immediately open the port again. 623 */ 624 if (ISSET(tp->t_cflag, HUPCL)) { 625 com_modem(sc, 0); 626 (void) tsleep(sc, TTIPRI, ttclos, hz); 627 } 628 629 s = splserial(); 630 /* Turn off interrupts. */ 631 #ifdef DDB 632 if(ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) 633 sc->sc_ier = IER_ERXRDY; /* interrupt on break */ 634 else 635 #else 636 sc->sc_ier = 0; 637 #endif 638 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 639 splx(s); 640 641 return (0); 642 } 643 644 int 645 comread(dev, uio, flag) 646 dev_t dev; 647 struct uio *uio; 648 int flag; 649 { 650 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 651 struct tty *tp = sc->sc_tty; 652 653 return ((*linesw[tp->t_line].l_read)(tp, uio, flag)); 654 } 655 656 int 657 comwrite(dev, uio, flag) 658 dev_t dev; 659 struct uio *uio; 660 int flag; 661 { 662 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 663 struct tty *tp = sc->sc_tty; 664 665 return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 666 } 667 668 struct tty * 669 comtty(dev) 670 dev_t dev; 671 { 672 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 673 struct tty *tp = sc->sc_tty; 674 675 return (tp); 676 } 677 678 int 679 comioctl(dev, cmd, data, flag, p) 680 dev_t dev; 681 u_long cmd; 682 caddr_t data; 683 int flag; 684 struct proc *p; 685 { 686 int unit = COMUNIT(dev); 687 struct com_softc *sc = com_cd.cd_devs[unit]; 688 struct tty *tp = sc->sc_tty; 689 int error; 690 691 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); 692 if (error >= 0) 693 return (error); 694 695 error = ttioctl(tp, cmd, data, flag, p); 696 if (error >= 0) 697 return (error); 698 699 switch (cmd) { 700 case TIOCSBRK: 701 com_break(sc, 1); 702 break; 703 704 case TIOCCBRK: 705 com_break(sc, 0); 706 break; 707 708 case TIOCSDTR: 709 com_modem(sc, 1); 710 break; 711 712 case TIOCCDTR: 713 com_modem(sc, 0); 714 break; 715 716 case TIOCGFLAGS: 717 *(int *)data = sc->sc_swflags; 718 break; 719 720 case TIOCSFLAGS: 721 error = suser(p->p_ucred, &p->p_acflag); 722 if (error) 723 return (error); 724 sc->sc_swflags = *(int *)data; 725 break; 726 727 case TIOCMSET: 728 case TIOCMBIS: 729 case TIOCMBIC: 730 case TIOCMGET: 731 default: 732 return (ENOTTY); 733 } 734 735 #ifdef COM_DEBUG 736 if (com_debug) 737 comstatus(sc, "comioctl "); 738 #endif 739 740 return (0); 741 } 742 743 integrate void 744 com_schedrx(sc) 745 struct com_softc *sc; 746 { 747 748 sc->sc_rx_ready = 1; 749 750 /* Wake up the poller. */ 751 #ifdef __GENERIC_SOFT_INTERRUPTS 752 softintr_schedule(sc->sc_si); 753 #else 754 #ifndef alpha 755 setsoftserial(); 756 #else 757 if (!com_softintr_scheduled) { 758 com_softintr_scheduled = 1; 759 timeout(comsoft, NULL, 1); 760 } 761 #endif 762 #endif 763 } 764 765 void 766 com_break(sc, onoff) 767 struct com_softc *sc; 768 int onoff; 769 { 770 int s; 771 772 s = splserial(); 773 if (onoff) 774 SET(sc->sc_lcr, LCR_SBREAK); 775 else 776 CLR(sc->sc_lcr, LCR_SBREAK); 777 778 if (!sc->sc_heldchange) { 779 if (sc->sc_tx_busy) { 780 sc->sc_heldtbc = sc->sc_tbc; 781 sc->sc_tbc = 0; 782 sc->sc_heldchange = 1; 783 } else 784 com_loadchannelregs(sc); 785 } 786 splx(s); 787 } 788 789 void 790 com_modem(sc, onoff) 791 struct com_softc *sc; 792 int onoff; 793 { 794 int s; 795 796 s = splserial(); 797 if (onoff) 798 SET(sc->sc_mcr, sc->sc_mcr_dtr); 799 else 800 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 801 802 if (!sc->sc_heldchange) { 803 if (sc->sc_tx_busy) { 804 sc->sc_heldtbc = sc->sc_tbc; 805 sc->sc_tbc = 0; 806 sc->sc_heldchange = 1; 807 } else 808 com_loadchannelregs(sc); 809 } 810 splx(s); 811 } 812 813 static u_char 814 cflag2lcr(cflag) 815 tcflag_t cflag; 816 { 817 u_char lcr = 0; 818 819 switch (ISSET(cflag, CSIZE)) { 820 case CS5: 821 SET(lcr, LCR_5BITS); 822 break; 823 case CS6: 824 SET(lcr, LCR_6BITS); 825 break; 826 case CS7: 827 SET(lcr, LCR_7BITS); 828 break; 829 case CS8: 830 SET(lcr, LCR_8BITS); 831 break; 832 } 833 if (ISSET(cflag, PARENB)) { 834 SET(lcr, LCR_PENAB); 835 if (!ISSET(cflag, PARODD)) 836 SET(lcr, LCR_PEVEN); 837 } 838 if (ISSET(cflag, CSTOPB)) 839 SET(lcr, LCR_STOPB); 840 841 return(lcr); 842 } 843 844 int 845 comparam(tp, t) 846 struct tty *tp; 847 struct termios *t; 848 { 849 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 850 int ospeed = comspeed(t->c_ospeed); 851 u_char lcr; 852 int s; 853 854 /* check requested parameters */ 855 if (ospeed < 0) 856 return (EINVAL); 857 if (t->c_ispeed && t->c_ispeed != t->c_ospeed) 858 return (EINVAL); 859 860 lcr = ISSET(sc->sc_lcr, LCR_SBREAK) | cflag2lcr(t->c_cflag); 861 862 s = splserial(); 863 864 sc->sc_lcr = lcr; 865 866 /* 867 * For the console, always force CLOCAL and !HUPCL, so that the port 868 * is always active. 869 */ 870 if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) || 871 ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 872 SET(t->c_cflag, CLOCAL); 873 CLR(t->c_cflag, HUPCL); 874 } 875 876 /* 877 * If we're not in a mode that assumes a connection is present, then 878 * ignore carrier changes. 879 */ 880 if (ISSET(t->c_cflag, CLOCAL | MDMBUF)) 881 sc->sc_msr_dcd = 0; 882 else 883 sc->sc_msr_dcd = MSR_DCD; 884 /* 885 * Set the flow control pins depending on the current flow control 886 * mode. 887 */ 888 if (ISSET(t->c_cflag, CRTSCTS)) { 889 sc->sc_mcr_dtr = MCR_DTR; 890 sc->sc_mcr_rts = MCR_RTS; 891 sc->sc_msr_cts = MSR_CTS; 892 sc->sc_r_hiwat = RXHIWAT; 893 sc->sc_r_lowat = RXLOWAT; 894 } else if (ISSET(t->c_cflag, MDMBUF)) { 895 /* 896 * For DTR/DCD flow control, make sure we don't toggle DTR for 897 * carrier detection. 898 */ 899 sc->sc_mcr_dtr = 0; 900 sc->sc_mcr_rts = MCR_DTR; 901 sc->sc_msr_cts = MSR_DCD; 902 sc->sc_r_hiwat = RXHIWAT; 903 sc->sc_r_lowat = RXLOWAT; 904 } else { 905 /* 906 * If no flow control, then always set RTS. This will make 907 * the other side happy if it mistakenly thinks we're doing 908 * RTS/CTS flow control. 909 */ 910 sc->sc_mcr_dtr = MCR_DTR | MCR_RTS; 911 sc->sc_mcr_rts = 0; 912 sc->sc_msr_cts = 0; 913 sc->sc_r_hiwat = 0; 914 sc->sc_r_lowat = 0; 915 if (ISSET(sc->sc_mcr, MCR_DTR)) 916 SET(sc->sc_mcr, MCR_RTS); 917 else 918 CLR(sc->sc_mcr, MCR_RTS); 919 } 920 sc->sc_msr_mask = sc->sc_msr_cts | sc->sc_msr_dcd; 921 922 #if 0 923 if (ospeed == 0) 924 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 925 else 926 SET(sc->sc_mcr, sc->sc_mcr_dtr); 927 #endif 928 929 sc->sc_dlbl = ospeed; 930 sc->sc_dlbh = ospeed >> 8; 931 932 /* 933 * Set the FIFO threshold based on the receive speed. 934 * 935 * * If it's a low speed, it's probably a mouse or some other 936 * interactive device, so set the threshold low. 937 * * If it's a high speed, trim the trigger level down to prevent 938 * overflows. 939 * * Otherwise set it a bit higher. 940 */ 941 if (ISSET(sc->sc_hwflags, COM_HW_HAYESP)) 942 sc->sc_fifo = FIFO_DMA_MODE | FIFO_ENABLE | FIFO_TRIGGER_8; 943 else if (ISSET(sc->sc_hwflags, COM_HW_FIFO)) 944 sc->sc_fifo = FIFO_ENABLE | 945 (t->c_ospeed <= 1200 ? FIFO_TRIGGER_1 : 946 t->c_ospeed <= 38400 ? FIFO_TRIGGER_8 : FIFO_TRIGGER_4); 947 else 948 sc->sc_fifo = 0; 949 950 /* and copy to tty */ 951 tp->t_ispeed = 0; 952 tp->t_ospeed = t->c_ospeed; 953 tp->t_cflag = t->c_cflag; 954 955 if (!sc->sc_heldchange) { 956 if (sc->sc_tx_busy) { 957 sc->sc_heldtbc = sc->sc_tbc; 958 sc->sc_tbc = 0; 959 sc->sc_heldchange = 1; 960 } else 961 com_loadchannelregs(sc); 962 } 963 964 splx(s); 965 966 /* 967 * Update the tty layer's idea of the carrier bit, in case we changed 968 * CLOCAL or MDMBUF. We don't hang up here; we only do that if we 969 * lose carrier while carrier detection is on. 970 */ 971 (void) (*linesw[tp->t_line].l_modem)(tp, ISSET(sc->sc_msr, MSR_DCD)); 972 973 #ifdef COM_DEBUG 974 if (com_debug) 975 comstatus(sc, "comparam "); 976 #endif 977 978 /* Block or unblock as needed. */ 979 if (!ISSET(t->c_cflag, CHWFLOW)) { 980 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 981 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 982 com_schedrx(sc); 983 } 984 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 985 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 986 com_hwiflow(sc); 987 } 988 if (sc->sc_tx_stopped) { 989 sc->sc_tx_stopped = 0; 990 comstart(tp); 991 } 992 } else { 993 /* XXXXX FIX ME */ 994 #if 0 995 commsrint(sc, tp); 996 #endif 997 } 998 999 return (0); 1000 } 1001 1002 void 1003 com_iflush(sc) 1004 struct com_softc *sc; 1005 { 1006 bus_space_tag_t iot = sc->sc_iot; 1007 bus_space_handle_t ioh = sc->sc_ioh; 1008 1009 /* flush any pending I/O */ 1010 while (ISSET(bus_space_read_1(iot, ioh, com_lsr), LSR_RXRDY)) 1011 (void) bus_space_read_1(iot, ioh, com_data); 1012 } 1013 1014 void 1015 com_loadchannelregs(sc) 1016 struct com_softc *sc; 1017 { 1018 bus_space_tag_t iot = sc->sc_iot; 1019 bus_space_handle_t ioh = sc->sc_ioh; 1020 1021 /* XXXXX necessary? */ 1022 com_iflush(sc); 1023 1024 bus_space_write_1(iot, ioh, com_ier, 0); 1025 1026 bus_space_write_1(iot, ioh, com_lcr, sc->sc_lcr | LCR_DLAB); 1027 bus_space_write_1(iot, ioh, com_dlbl, sc->sc_dlbl); 1028 bus_space_write_1(iot, ioh, com_dlbh, sc->sc_dlbh); 1029 bus_space_write_1(iot, ioh, com_lcr, sc->sc_lcr); 1030 bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr_active = sc->sc_mcr); 1031 bus_space_write_1(iot, ioh, com_fifo, sc->sc_fifo); 1032 1033 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1034 } 1035 1036 int 1037 comhwiflow(tp, block) 1038 struct tty *tp; 1039 int block; 1040 { 1041 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1042 int s; 1043 1044 if (sc->sc_mcr_rts == 0) 1045 return (0); 1046 1047 s = splserial(); 1048 if (block) { 1049 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1050 SET(sc->sc_rx_flags, RX_TTY_BLOCKED); 1051 com_hwiflow(sc); 1052 } 1053 } else { 1054 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1055 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1056 com_schedrx(sc); 1057 } 1058 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1059 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED); 1060 com_hwiflow(sc); 1061 } 1062 } 1063 splx(s); 1064 return (1); 1065 } 1066 1067 /* 1068 * (un)block input via hw flowcontrol 1069 */ 1070 void 1071 com_hwiflow(sc) 1072 struct com_softc *sc; 1073 { 1074 bus_space_tag_t iot = sc->sc_iot; 1075 bus_space_handle_t ioh = sc->sc_ioh; 1076 1077 if (sc->sc_mcr_rts == 0) 1078 return; 1079 1080 if (ISSET(sc->sc_rx_flags, RX_ANY_BLOCK)) { 1081 CLR(sc->sc_mcr, sc->sc_mcr_rts); 1082 CLR(sc->sc_mcr_active, sc->sc_mcr_rts); 1083 } else { 1084 SET(sc->sc_mcr, sc->sc_mcr_rts); 1085 SET(sc->sc_mcr_active, sc->sc_mcr_rts); 1086 } 1087 bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr_active); 1088 } 1089 1090 1091 void 1092 comstart(tp) 1093 struct tty *tp; 1094 { 1095 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1096 bus_space_tag_t iot = sc->sc_iot; 1097 bus_space_handle_t ioh = sc->sc_ioh; 1098 int s; 1099 1100 s = spltty(); 1101 if (ISSET(tp->t_state, TS_BUSY)) 1102 goto out; 1103 if (ISSET(tp->t_state, TS_TIMEOUT | TS_TTSTOP)) 1104 goto stopped; 1105 1106 if (sc->sc_tx_stopped) 1107 goto stopped; 1108 1109 if (tp->t_outq.c_cc <= tp->t_lowat) { 1110 if (ISSET(tp->t_state, TS_ASLEEP)) { 1111 CLR(tp->t_state, TS_ASLEEP); 1112 wakeup(&tp->t_outq); 1113 } 1114 selwakeup(&tp->t_wsel); 1115 if (tp->t_outq.c_cc == 0) 1116 goto stopped; 1117 } 1118 1119 /* Grab the first contiguous region of buffer space. */ 1120 { 1121 u_char *tba; 1122 int tbc; 1123 1124 tba = tp->t_outq.c_cf; 1125 tbc = ndqb(&tp->t_outq, 0); 1126 1127 (void)splserial(); 1128 1129 sc->sc_tba = tba; 1130 sc->sc_tbc = tbc; 1131 } 1132 1133 SET(tp->t_state, TS_BUSY); 1134 sc->sc_tx_busy = 1; 1135 1136 /* Enable transmit completion interrupts if necessary. */ 1137 if (!ISSET(sc->sc_ier, IER_ETXRDY)) { 1138 SET(sc->sc_ier, IER_ETXRDY); 1139 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1140 } 1141 1142 /* Output the first chunk of the contiguous buffer. */ 1143 { 1144 int n; 1145 1146 n = sc->sc_fifolen; 1147 if (n > sc->sc_tbc) 1148 n = sc->sc_tbc; 1149 bus_space_write_multi_1(iot, ioh, com_data, sc->sc_tba, n); 1150 sc->sc_tbc -= n; 1151 sc->sc_tba += n; 1152 } 1153 splx(s); 1154 return; 1155 1156 stopped: 1157 /* Disable transmit completion interrupts if necessary. */ 1158 if (ISSET(sc->sc_ier, IER_ETXRDY)) { 1159 CLR(sc->sc_ier, IER_ETXRDY); 1160 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1161 } 1162 out: 1163 splx(s); 1164 return; 1165 } 1166 1167 /* 1168 * Stop output on a line. 1169 */ 1170 void 1171 comstop(tp, flag) 1172 struct tty *tp; 1173 int flag; 1174 { 1175 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1176 int s; 1177 1178 s = splserial(); 1179 if (ISSET(tp->t_state, TS_BUSY)) { 1180 /* Stop transmitting at the next chunk. */ 1181 sc->sc_tbc = 0; 1182 sc->sc_heldtbc = 0; 1183 if (!ISSET(tp->t_state, TS_TTSTOP)) 1184 SET(tp->t_state, TS_FLUSH); 1185 } 1186 splx(s); 1187 } 1188 1189 void 1190 comdiag(arg) 1191 void *arg; 1192 { 1193 struct com_softc *sc = arg; 1194 int overflows, floods; 1195 int s; 1196 1197 s = splserial(); 1198 overflows = sc->sc_overflows; 1199 sc->sc_overflows = 0; 1200 floods = sc->sc_floods; 1201 sc->sc_floods = 0; 1202 sc->sc_errors = 0; 1203 splx(s); 1204 1205 log(LOG_WARNING, 1206 "%s: %d silo overflow%s, %d ibuf flood%s\n", 1207 sc->sc_dev.dv_xname, 1208 overflows, overflows == 1 ? "" : "s", 1209 floods, floods == 1 ? "" : "s"); 1210 } 1211 1212 integrate void 1213 comrxint(sc, tp) 1214 struct com_softc *sc; 1215 struct tty *tp; 1216 { 1217 u_int get, cc, scc; 1218 int code; 1219 u_char lsr; 1220 int s; 1221 static int lsrmap[8] = { 1222 0, TTY_PE, 1223 TTY_FE, TTY_PE|TTY_FE, 1224 TTY_FE, TTY_PE|TTY_FE, 1225 TTY_FE, TTY_PE|TTY_FE 1226 }; 1227 1228 get = sc->sc_rbget; 1229 scc = cc = RXBUFSIZE - sc->sc_rbavail; 1230 1231 if (cc == RXBUFSIZE) { 1232 sc->sc_floods++; 1233 if (sc->sc_errors++ == 0) 1234 timeout(comdiag, sc, 60 * hz); 1235 } 1236 1237 while (cc) { 1238 lsr = sc->sc_lbuf[get]; 1239 if (ISSET(lsr, LSR_OE)) { 1240 sc->sc_overflows++; 1241 if (sc->sc_errors++ == 0) 1242 timeout(comdiag, sc, 60 * hz); 1243 } 1244 code = sc->sc_rbuf[get] | 1245 lsrmap[(lsr & (LSR_BI|LSR_FE|LSR_PE)) >> 2]; 1246 if ((*linesw[tp->t_line].l_rint)(code, tp) == -1) { 1247 /* 1248 * The line discipline's buffer is out of space. 1249 */ 1250 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1251 /* 1252 * We're either not using flow control, or the 1253 * line discipline didn't tell us to block for 1254 * some reason. Either way, we have no way to 1255 * know when there's more space available, so 1256 * just drop the rest of the data. 1257 */ 1258 get = (get + cc) & RXBUFMASK; 1259 cc = 0; 1260 } else { 1261 /* 1262 * Don't schedule any more receive processing 1263 * until the line discipline tells us there's 1264 * space available (through comhwiflow()). 1265 * Leave the rest of the data in the input 1266 * buffer. 1267 */ 1268 SET(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1269 } 1270 break; 1271 } 1272 get = (get + 1) & RXBUFMASK; 1273 cc--; 1274 } 1275 1276 if (cc != scc) { 1277 sc->sc_rbget = get; 1278 s = splserial(); 1279 cc = sc->sc_rbavail += scc - cc; 1280 /* Buffers should be ok again, release possible block. */ 1281 if (cc >= sc->sc_r_lowat) { 1282 if (ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1283 CLR(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1284 SET(sc->sc_ier, IER_ERXRDY); 1285 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 1286 } 1287 if (ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED)) { 1288 CLR(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1289 com_hwiflow(sc); 1290 } 1291 } 1292 splx(s); 1293 } 1294 } 1295 1296 integrate void 1297 comtxint(sc, tp) 1298 struct com_softc *sc; 1299 struct tty *tp; 1300 { 1301 1302 CLR(tp->t_state, TS_BUSY); 1303 if (ISSET(tp->t_state, TS_FLUSH)) 1304 CLR(tp->t_state, TS_FLUSH); 1305 else 1306 ndflush(&tp->t_outq, (int)(sc->sc_tba - tp->t_outq.c_cf)); 1307 (*linesw[tp->t_line].l_start)(tp); 1308 } 1309 1310 integrate void 1311 commsrint(sc, tp) 1312 struct com_softc *sc; 1313 struct tty *tp; 1314 { 1315 u_char msr, delta; 1316 int s; 1317 1318 s = splserial(); 1319 msr = sc->sc_msr; 1320 delta = sc->sc_msr_delta; 1321 sc->sc_msr_delta = 0; 1322 splx(s); 1323 1324 if (ISSET(delta, sc->sc_msr_dcd)) { 1325 /* 1326 * Inform the tty layer that carrier detect changed. 1327 */ 1328 (void) (*linesw[tp->t_line].l_modem)(tp, ISSET(msr, MSR_DCD)); 1329 } 1330 1331 if (ISSET(delta, sc->sc_msr_cts)) { 1332 /* Block or unblock output according to flow control. */ 1333 if (ISSET(msr, sc->sc_msr_cts)) { 1334 sc->sc_tx_stopped = 0; 1335 (*linesw[tp->t_line].l_start)(tp); 1336 } else { 1337 sc->sc_tx_stopped = 1; 1338 } 1339 } 1340 1341 #ifdef COM_DEBUG 1342 if (com_debug) 1343 comstatus(sc, "commsrint"); 1344 #endif 1345 } 1346 1347 #ifdef __GENERIC_SOFT_INTERRUPTS 1348 void 1349 comsoft(arg) 1350 void *arg; 1351 { 1352 struct com_softc *sc = arg; 1353 struct tty *tp; 1354 1355 { 1356 #else 1357 void 1358 #ifndef alpha 1359 comsoft() 1360 #else 1361 comsoft(arg) 1362 void *arg; 1363 #endif 1364 { 1365 struct com_softc *sc; 1366 struct tty *tp; 1367 int unit; 1368 #ifdef alpha 1369 int s; 1370 1371 s = splsoftserial(); 1372 com_softintr_scheduled = 0; 1373 #endif 1374 1375 for (unit = 0; unit < com_cd.cd_ndevs; unit++) { 1376 sc = com_cd.cd_devs[unit]; 1377 if (sc == NULL) 1378 continue; 1379 1380 tp = sc->sc_tty; 1381 if (tp == NULL || !ISSET(tp->t_state, TS_ISOPEN | TS_WOPEN)) 1382 continue; 1383 #endif 1384 tp = sc->sc_tty; 1385 1386 if (sc->sc_rx_ready) { 1387 sc->sc_rx_ready = 0; 1388 comrxint(sc, tp); 1389 } 1390 1391 if (sc->sc_st_check) { 1392 sc->sc_st_check = 0; 1393 commsrint(sc, tp); 1394 } 1395 1396 if (sc->sc_tx_done) { 1397 sc->sc_tx_done = 0; 1398 comtxint(sc, tp); 1399 } 1400 } 1401 1402 #ifndef __GENERIC_SOFT_INTERRUPTS 1403 #ifdef alpha 1404 splx(s); 1405 #endif 1406 #endif 1407 } 1408 1409 int 1410 comintr(arg) 1411 void *arg; 1412 { 1413 struct com_softc *sc = arg; 1414 bus_space_tag_t iot = sc->sc_iot; 1415 bus_space_handle_t ioh = sc->sc_ioh; 1416 u_char lsr, iir; 1417 u_int put, cc; 1418 1419 iir = bus_space_read_1(iot, ioh, com_iir); 1420 if (ISSET(iir, IIR_NOPEND)) 1421 return (0); 1422 1423 put = sc->sc_rbput; 1424 cc = sc->sc_rbavail; 1425 1426 do { 1427 u_char msr, delta; 1428 1429 lsr = bus_space_read_1(iot, ioh, com_lsr); 1430 #if defined(DDB) || defined(KGDB) 1431 if (ISSET(lsr, LSR_BI)) { 1432 #ifdef DDB 1433 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 1434 Debugger(); 1435 continue; 1436 } 1437 #endif 1438 #ifdef KGDB 1439 if (ISSET(sc->sc_hwflags, COM_HW_KGDB)) { 1440 kgdb_connect(1); 1441 continue; 1442 } 1443 #endif 1444 } 1445 #endif /* DDB || KGDB */ 1446 1447 if (ISSET(lsr, LSR_RCV_MASK) && 1448 !ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1449 for (; ISSET(lsr, LSR_RCV_MASK) && cc > 0; cc--) { 1450 sc->sc_rbuf[put] = 1451 bus_space_read_1(iot, ioh, com_data); 1452 sc->sc_lbuf[put] = lsr; 1453 put = (put + 1) & RXBUFMASK; 1454 lsr = bus_space_read_1(iot, ioh, com_lsr); 1455 } 1456 /* 1457 * Current string of incoming characters ended because 1458 * no more data was available. Schedule a receive event 1459 * if any data was received. Drop any characters that 1460 * we couldn't handle. 1461 */ 1462 sc->sc_rbput = put; 1463 sc->sc_rbavail = cc; 1464 if (!ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) 1465 sc->sc_rx_ready = 1; 1466 /* 1467 * See if we are in danger of overflowing a buffer. If 1468 * so, use hardware flow control to ease the pressure. 1469 */ 1470 if (!ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED) && 1471 cc < sc->sc_r_hiwat) { 1472 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1473 com_hwiflow(sc); 1474 } 1475 /* 1476 * If we're out of space, disable receive interrupts 1477 * until the queue has drained a bit. 1478 */ 1479 if (!cc) { 1480 SET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1481 CLR(sc->sc_ier, IER_ERXRDY); 1482 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1483 } 1484 } else { 1485 if ((iir & IIR_IMASK) == IIR_RXRDY) { 1486 bus_space_write_1(iot, ioh, com_ier, 0); 1487 delay(10); 1488 bus_space_write_1(iot, ioh, com_ier,sc->sc_ier); 1489 iir = IIR_NOPEND; 1490 continue; 1491 } 1492 } 1493 1494 msr = bus_space_read_1(iot, ioh, com_msr); 1495 delta = msr ^ sc->sc_msr; 1496 sc->sc_msr = msr; 1497 if (ISSET(delta, sc->sc_msr_mask)) { 1498 sc->sc_msr_delta |= delta; 1499 1500 /* 1501 * Stop output immediately if we lose the output 1502 * flow control signal or carrier detect. 1503 */ 1504 if (ISSET(~msr, sc->sc_msr_mask)) { 1505 sc->sc_tbc = 0; 1506 sc->sc_heldtbc = 0; 1507 #ifdef COM_DEBUG 1508 if (com_debug) 1509 comstatus(sc, "comintr "); 1510 #endif 1511 } 1512 1513 sc->sc_st_check = 1; 1514 } 1515 } while (!ISSET((iir = bus_space_read_1(iot, ioh, com_iir)), IIR_NOPEND)); 1516 1517 /* 1518 * Done handling any receive interrupts. See if data can be 1519 * transmitted as well. Schedule tx done event if no data left 1520 * and tty was marked busy. 1521 */ 1522 if (ISSET(lsr, LSR_TXRDY)) { 1523 /* 1524 * If we've delayed a parameter change, do it now, and restart 1525 * output. 1526 */ 1527 if (sc->sc_heldchange) { 1528 com_loadchannelregs(sc); 1529 sc->sc_heldchange = 0; 1530 sc->sc_tbc = sc->sc_heldtbc; 1531 sc->sc_heldtbc = 0; 1532 } 1533 /* Output the next chunk of the contiguous buffer, if any. */ 1534 if (sc->sc_tbc > 0) { 1535 int n; 1536 1537 n = sc->sc_fifolen; 1538 if (n > sc->sc_tbc) 1539 n = sc->sc_tbc; 1540 bus_space_write_multi_1(iot, ioh, com_data, sc->sc_tba, n); 1541 sc->sc_tbc -= n; 1542 sc->sc_tba += n; 1543 } else if (sc->sc_tx_busy) { 1544 sc->sc_tx_busy = 0; 1545 sc->sc_tx_done = 1; 1546 } 1547 } 1548 1549 /* Wake up the poller. */ 1550 #ifdef __GENERIC_SOFT_INTERRUPTS 1551 softintr_schedule(sc->sc_si); 1552 #else 1553 #ifndef alpha 1554 setsoftserial(); 1555 #else 1556 if (!com_softintr_scheduled) { 1557 com_softintr_scheduled = 1; 1558 timeout(comsoft, NULL, 1); 1559 } 1560 #endif 1561 #endif 1562 return (1); 1563 } 1564 1565 /* 1566 * The following functions are polled getc and putc routines, shared 1567 * by the console and kgdb glue. 1568 */ 1569 1570 int 1571 com_common_getc(iot, ioh) 1572 bus_space_tag_t iot; 1573 bus_space_handle_t ioh; 1574 { 1575 int s = splserial(); 1576 u_char stat, c; 1577 1578 while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_RXRDY)) 1579 ; 1580 c = bus_space_read_1(iot, ioh, com_data); 1581 stat = bus_space_read_1(iot, ioh, com_iir); 1582 splx(s); 1583 return (c); 1584 } 1585 1586 void 1587 com_common_putc(iot, ioh, c) 1588 bus_space_tag_t iot; 1589 bus_space_handle_t ioh; 1590 int c; 1591 { 1592 int s = splserial(); 1593 u_char stat; 1594 register int timo; 1595 1596 /* wait for any pending transmission to finish */ 1597 timo = 50000; 1598 while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_TXRDY) 1599 && --timo) 1600 ; 1601 bus_space_write_1(iot, ioh, com_data, c); 1602 /* wait for this transmission to complete */ 1603 timo = 1500000; 1604 while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_TXRDY) 1605 && --timo) 1606 ; 1607 /* clear any interrupts generated by this transmission */ 1608 stat = bus_space_read_1(iot, ioh, com_iir); 1609 splx(s); 1610 } 1611 1612 /* 1613 * Initialize UART to known state. 1614 */ 1615 int 1616 cominit(iot, iobase, rate, cflag, iohp) 1617 bus_space_tag_t iot; 1618 int iobase; 1619 int rate; 1620 tcflag_t cflag; 1621 bus_space_handle_t *iohp; 1622 { 1623 bus_space_handle_t ioh; 1624 1625 if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) 1626 return(ENOMEM); /* ??? */ 1627 1628 bus_space_write_1(iot, ioh, com_lcr, LCR_DLAB); 1629 rate = comspeed(rate); 1630 bus_space_write_1(iot, ioh, com_dlbl, rate); 1631 bus_space_write_1(iot, ioh, com_dlbh, rate >> 8); 1632 bus_space_write_1(iot, ioh, com_lcr, cflag2lcr(cflag)); 1633 bus_space_write_1(iot, ioh, com_mcr, 0); 1634 bus_space_write_1(iot, ioh, com_fifo, 1635 FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_1); 1636 bus_space_write_1(iot, ioh, com_ier, 0); 1637 1638 *iohp = ioh; 1639 return(0); 1640 } 1641 1642 /* 1643 * Following are all routines needed for COM to act as console 1644 */ 1645 1646 int 1647 comcnattach(iot, iobase, rate, cflag) 1648 bus_space_tag_t iot; 1649 int iobase; 1650 int rate; 1651 tcflag_t cflag; 1652 { 1653 int res; 1654 static struct consdev comcons = { NULL, NULL, 1655 comcngetc, comcnputc, comcnpollc, NODEV, CN_NORMAL}; 1656 1657 res = cominit(iot, iobase, rate, cflag, &comconsioh); 1658 if(res) return(res); 1659 1660 cn_tab = &comcons; 1661 1662 comconstag = iot; 1663 comconsaddr = iobase; 1664 comconsrate = rate; 1665 comconscflag = cflag; 1666 1667 return(0); 1668 } 1669 1670 int 1671 comcngetc(dev) 1672 dev_t dev; 1673 { 1674 1675 return (com_common_getc(comconstag, comconsioh)); 1676 } 1677 1678 /* 1679 * Console kernel output character routine. 1680 */ 1681 void 1682 comcnputc(dev, c) 1683 dev_t dev; 1684 int c; 1685 { 1686 1687 com_common_putc(comconstag, comconsioh, c); 1688 } 1689 1690 void 1691 comcnpollc(dev, on) 1692 dev_t dev; 1693 int on; 1694 { 1695 1696 } 1697 1698 #ifdef KGDB 1699 int 1700 com_kgdb_attach(iot, iobase, rate, cflag) 1701 bus_space_tag_t iot; 1702 int iobase; 1703 int rate; 1704 tcflag_t cflag; 1705 { 1706 int res; 1707 1708 if (iot == comconstag && iobase == comconsaddr) 1709 return(EBUSY); /* cannot share with console */ 1710 1711 res = cominit(iot, iobase, rate, cflag, &com_kgdb_ioh); 1712 if(res) return(res); 1713 1714 kgdb_attach(com_kgdb_getc, com_kgdb_putc, NULL); 1715 kgdb_dev = 123; /* unneeded, only to satisfy some tests */ 1716 1717 com_kgdb_iot = iot; 1718 com_kgdb_addr = iobase; 1719 1720 return(0); 1721 } 1722 1723 /* ARGSUSED */ 1724 int 1725 com_kgdb_getc(arg) 1726 void *arg; 1727 { 1728 1729 return (com_common_getc(com_kgdb_iot, com_kgdb_ioh)); 1730 } 1731 1732 /* ARGSUSED */ 1733 void 1734 com_kgdb_putc(arg, c) 1735 void *arg; 1736 int c; 1737 { 1738 1739 return (com_common_putc(com_kgdb_iot, com_kgdb_ioh, c)); 1740 } 1741 #endif /* KGDB */ 1742 1743 /* helper function to identify the com ports used by 1744 console or KGDB (and not yet autoconf attached) */ 1745 int 1746 com_is_console(iot, iobase, ioh) 1747 bus_space_tag_t iot; 1748 int iobase; 1749 bus_space_handle_t *ioh; 1750 { 1751 bus_space_handle_t help; 1752 1753 if (!comconsattached 1754 && iot == comconstag && iobase == comconsaddr) 1755 help = comconsioh; 1756 #ifdef KGDB 1757 else if (!com_kgdb_attached 1758 && iot == com_kgdb_iot && iobase == com_kgdb_addr) 1759 help = com_kgdb_ioh; 1760 #endif 1761 else 1762 return(0); 1763 1764 if(ioh) *ioh = help; 1765 return(1); 1766 } 1767
Indexes created Tue Sep 23 14:10:03 GMT 2025