com.c revision 1.131
1 /* $NetBSD: com.c,v 1.131 1998/02/01 23:33:01 marc 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 * Supports automatic hardware flow control on StarTech ST16C650A UART 74 */ 75 76 #include "rnd.h" 77 #if NRND > 0 && defined(RND_COM) 78 #include <sys/rnd.h> 79 #endif 80 81 #include <sys/param.h> 82 #include <sys/systm.h> 83 #include <sys/ioctl.h> 84 #include <sys/select.h> 85 #include <sys/tty.h> 86 #include <sys/proc.h> 87 #include <sys/user.h> 88 #include <sys/conf.h> 89 #include <sys/file.h> 90 #include <sys/uio.h> 91 #include <sys/kernel.h> 92 #include <sys/syslog.h> 93 #include <sys/types.h> 94 #include <sys/device.h> 95 #include <sys/malloc.h> 96 97 #include <machine/intr.h> 98 #include <machine/bus.h> 99 100 #include <dev/ic/comreg.h> 101 #include <dev/ic/comvar.h> 102 #include <dev/ic/ns16550reg.h> 103 #include <dev/ic/st16650reg.h> 104 #ifdef COM_HAYESP 105 #include <dev/ic/hayespreg.h> 106 #endif 107 #define com_lcr com_cfcr 108 #include <dev/cons.h> 109 110 #include "com.h" 111 112 #ifdef COM_HAYESP 113 int comprobeHAYESP __P((bus_space_handle_t hayespioh, struct com_softc *sc)); 114 #endif 115 116 #if defined(DDB) || defined(KGDB) 117 static void com_enable_debugport __P((struct com_softc *)); 118 #endif 119 void com_attach_subr __P((struct com_softc *sc)); 120 void com_config __P((struct com_softc *)); 121 int comspeed __P((long, long)); 122 static u_char cflag2lcr __P((tcflag_t)); 123 int comparam __P((struct tty *, struct termios *)); 124 void comstart __P((struct tty *)); 125 void comstop __P((struct tty *, int)); 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 #ifdef __GENERIC_SOFT_INTERRUPTS 147 void comsoft __P((void *)); 148 #else 149 #ifndef alpha 150 void comsoft __P((void)); 151 #else 152 void comsoft __P((void *)); 153 #endif 154 #endif 155 integrate void com_rxsoft __P((struct com_softc *, struct tty *)); 156 integrate void com_txsoft __P((struct com_softc *, struct tty *)); 157 integrate void com_stsoft __P((struct com_softc *, struct tty *)); 158 integrate void com_schedrx __P((struct com_softc *)); 159 void comdiag __P((void *)); 160 161 extern struct cfdriver com_cd; 162 163 /* 164 * Make this an option variable one can patch. 165 * But be warned: this must be a power of 2! 166 */ 167 u_int com_rbuf_size = COM_RING_SIZE; 168 169 /* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */ 170 u_int com_rbuf_hiwat = (COM_RING_SIZE * 1) / 4; 171 u_int com_rbuf_lowat = (COM_RING_SIZE * 3) / 4; 172 173 static int comconsaddr; 174 static bus_space_tag_t comconstag; 175 static bus_space_handle_t comconsioh; 176 static int comconsattached; 177 static int comconsrate; 178 static tcflag_t comconscflag; 179 180 static u_char tiocm_xxx2mcr __P((int)); 181 182 #ifndef __GENERIC_SOFT_INTERRUPTS 183 #ifdef alpha 184 volatile int com_softintr_scheduled; 185 #endif 186 #endif 187 188 #ifdef KGDB 189 #include <sys/kgdb.h> 190 191 static int com_kgdb_addr; 192 static bus_space_tag_t com_kgdb_iot; 193 static bus_space_handle_t com_kgdb_ioh; 194 static int com_kgdb_attached; 195 196 int com_kgdb_getc __P((void *)); 197 void com_kgdb_putc __P((void *, int)); 198 #endif /* KGDB */ 199 200 #define COMUNIT(x) (minor(x)) 201 202 int 203 comspeed(speed, frequency) 204 long speed, frequency; 205 { 206 #define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */ 207 208 int x, err; 209 210 #if 0 211 if (speed == 0) 212 return (0); 213 #endif 214 if (speed <= 0) 215 return (-1); 216 x = divrnd(frequency / 16, speed); 217 if (x <= 0) 218 return (-1); 219 err = divrnd(((quad_t)frequency) * 1000 / 16, speed * x) - 1000; 220 if (err < 0) 221 err = -err; 222 if (err > COM_TOLERANCE) 223 return (-1); 224 return (x); 225 226 #undef divrnd(n, q) 227 } 228 229 #ifdef COM_DEBUG 230 int com_debug = 0; 231 232 void comstatus __P((struct com_softc *, char *)); 233 void 234 comstatus(sc, str) 235 struct com_softc *sc; 236 char *str; 237 { 238 struct tty *tp = sc->sc_tty; 239 240 printf("%s: %s %sclocal %sdcd %sts_carr_on %sdtr %stx_stopped\n", 241 sc->sc_dev.dv_xname, str, 242 ISSET(tp->t_cflag, CLOCAL) ? "+" : "-", 243 ISSET(sc->sc_msr, MSR_DCD) ? "+" : "-", 244 ISSET(tp->t_state, TS_CARR_ON) ? "+" : "-", 245 ISSET(sc->sc_mcr, MCR_DTR) ? "+" : "-", 246 sc->sc_tx_stopped ? "+" : "-"); 247 248 printf("%s: %s %scrtscts %scts %sts_ttstop %srts %xrx_flags\n", 249 sc->sc_dev.dv_xname, str, 250 ISSET(tp->t_cflag, CRTSCTS) ? "+" : "-", 251 ISSET(sc->sc_msr, MSR_CTS) ? "+" : "-", 252 ISSET(tp->t_state, TS_TTSTOP) ? "+" : "-", 253 ISSET(sc->sc_mcr, MCR_RTS) ? "+" : "-", 254 sc->sc_rx_flags); 255 } 256 #endif 257 258 int 259 comprobe1(iot, ioh, iobase) 260 bus_space_tag_t iot; 261 bus_space_handle_t ioh; 262 int iobase; 263 { 264 265 /* force access to id reg */ 266 bus_space_write_1(iot, ioh, com_lcr, 0); 267 bus_space_write_1(iot, ioh, com_iir, 0); 268 if (bus_space_read_1(iot, ioh, com_iir) & 0x38) 269 return (0); 270 271 return (1); 272 } 273 274 #ifdef COM_HAYESP 275 int 276 comprobeHAYESP(hayespioh, sc) 277 bus_space_handle_t hayespioh; 278 struct com_softc *sc; 279 { 280 char val, dips; 281 int combaselist[] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8 }; 282 bus_space_tag_t iot = sc->sc_iot; 283 284 /* 285 * Hayes ESP cards have two iobases. One is for compatibility with 286 * 16550 serial chips, and at the same ISA PC base addresses. The 287 * other is for ESP-specific enhanced features, and lies at a 288 * different addressing range entirely (0x140, 0x180, 0x280, or 0x300). 289 */ 290 291 /* Test for ESP signature */ 292 if ((bus_space_read_1(iot, hayespioh, 0) & 0xf3) == 0) 293 return (0); 294 295 /* 296 * ESP is present at ESP enhanced base address; unknown com port 297 */ 298 299 /* Get the dip-switch configurations */ 300 bus_space_write_1(iot, hayespioh, HAYESP_CMD1, HAYESP_GETDIPS); 301 dips = bus_space_read_1(iot, hayespioh, HAYESP_STATUS1); 302 303 /* Determine which com port this ESP card services: bits 0,1 of */ 304 /* dips is the port # (0-3); combaselist[val] is the com_iobase */ 305 if (sc->sc_iobase != combaselist[dips & 0x03]) 306 return (0); 307 308 printf(": ESP"); 309 310 /* Check ESP Self Test bits. */ 311 /* Check for ESP version 2.0: bits 4,5,6 == 010 */ 312 bus_space_write_1(iot, hayespioh, HAYESP_CMD1, HAYESP_GETTEST); 313 val = bus_space_read_1(iot, hayespioh, HAYESP_STATUS1); /* Clear reg1 */ 314 val = bus_space_read_1(iot, hayespioh, HAYESP_STATUS2); 315 if ((val & 0x70) < 0x20) { 316 printf("-old (%o)", val & 0x70); 317 /* we do not support the necessary features */ 318 return (0); 319 } 320 321 /* Check for ability to emulate 16550: bit 8 == 1 */ 322 if ((dips & 0x80) == 0) { 323 printf(" slave"); 324 /* XXX Does slave really mean no 16550 support?? */ 325 return (0); 326 } 327 328 /* 329 * If we made it this far, we are a full-featured ESP v2.0 (or 330 * better), at the correct com port address. 331 */ 332 333 SET(sc->sc_hwflags, COM_HW_HAYESP); 334 printf(", 1024 byte fifo\n"); 335 return (1); 336 } 337 #endif 338 339 #if defined(DDB) || defined(KGDB) 340 static void 341 com_enable_debugport(sc) 342 struct com_softc *sc; 343 { 344 int s; 345 346 /* Turn on line break interrupt, set carrier. */ 347 s = splserial(); 348 sc->sc_ier = IER_ERXRDY; 349 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 350 SET(sc->sc_mcr, MCR_DTR | MCR_RTS); 351 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_mcr, sc->sc_mcr); 352 splx(s); 353 } 354 #endif 355 356 void 357 com_attach_subr(sc) 358 struct com_softc *sc; 359 { 360 int iobase = sc->sc_iobase; 361 bus_space_tag_t iot = sc->sc_iot; 362 bus_space_handle_t ioh = sc->sc_ioh; 363 struct tty *tp; 364 #ifdef COM16650 365 u_int8_t lcr; 366 #endif 367 #ifdef COM_HAYESP 368 int hayesp_ports[] = { 0x140, 0x180, 0x280, 0x300, 0 }; 369 int *hayespp; 370 #endif 371 372 /* Disable interrupts before configuring the device. */ 373 sc->sc_ier = 0; 374 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 375 376 if (iot == comconstag && iobase == comconsaddr) { 377 comconsattached = 1; 378 379 /* Make sure the console is always "hardwired". */ 380 delay(1000); /* wait for output to finish */ 381 SET(sc->sc_hwflags, COM_HW_CONSOLE); 382 SET(sc->sc_swflags, TIOCFLAG_SOFTCAR); 383 } 384 385 #ifdef COM_HAYESP 386 /* Look for a Hayes ESP board. */ 387 for (hayespp = hayesp_ports; *hayespp != 0; hayespp++) { 388 bus_space_handle_t hayespioh; 389 390 #define HAYESP_NPORTS 8 /* XXX XXX XXX ??? ??? ??? */ 391 if (bus_space_map(iot, *hayespp, HAYESP_NPORTS, 0, &hayespioh)) 392 continue; 393 if (comprobeHAYESP(hayespioh, sc)) { 394 sc->sc_hayespioh = hayespioh; 395 sc->sc_fifolen = 1024; 396 397 break; 398 } 399 bus_space_unmap(iot, hayespioh, HAYESP_NPORTS); 400 } 401 /* No ESP; look for other things. */ 402 if (!ISSET(sc->sc_hwflags, COM_HW_HAYESP)) { 403 #endif 404 sc->sc_fifolen = 1; 405 /* look for a NS 16550AF UART with FIFOs */ 406 bus_space_write_1(iot, ioh, com_fifo, 407 FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_14); 408 delay(100); 409 if (ISSET(bus_space_read_1(iot, ioh, com_iir), IIR_FIFO_MASK) 410 == IIR_FIFO_MASK) 411 if (ISSET(bus_space_read_1(iot, ioh, com_fifo), FIFO_TRIGGER_14) 412 == FIFO_TRIGGER_14) { 413 SET(sc->sc_hwflags, COM_HW_FIFO); 414 415 #ifdef COM16650 416 /* 417 * IIR changes into the EFR if LCR is set to LCR_EERS 418 * on 16650s. We also know IIR != 0 at this point. 419 * Write 0 into the EFR, and read it. If the result 420 * is 0, we have a 16650. 421 * 422 * Older 16650s were broken; the test to detect them 423 * is taken from the Linux driver. Apparently 424 * setting DLAB enable gives access to the EFR on 425 * these chips. 426 */ 427 lcr = bus_space_read_1(iot, ioh, com_lcr); 428 bus_space_write_1(iot, ioh, com_lcr, LCR_EERS); 429 bus_space_write_1(iot, ioh, com_efr, 0); 430 if (bus_space_read_1(iot, ioh, com_efr) == 0) { 431 bus_space_write_1(iot, ioh, com_lcr, 432 lcr | LCR_DLAB); 433 if (bus_space_read_1(iot, ioh, com_efr) == 0) { 434 CLR(sc->sc_hwflags, COM_HW_FIFO); 435 sc->sc_fifolen = 0; 436 } else { 437 SET(sc->sc_hwflags, COM_HW_FLOW); 438 sc->sc_fifolen = 32; 439 } 440 } else 441 #endif 442 sc->sc_fifolen = 16; 443 444 #ifdef COM16650 445 bus_space_write_1(iot, ioh, com_lcr, lcr); 446 if (sc->sc_fifolen == 0) 447 printf(": st16650, broken fifo\n"); 448 else if (sc->sc_fifolen == 32) 449 printf(": st16650a, working fifo\n"); 450 else 451 #endif 452 printf(": ns16550a, working fifo\n"); 453 } else 454 printf(": ns16550, broken fifo\n"); 455 else 456 printf(": ns8250 or ns16450, no fifo\n"); 457 bus_space_write_1(iot, ioh, com_fifo, 0); 458 #ifdef COM_HAYESP 459 } 460 #endif 461 462 tp = ttymalloc(); 463 tp->t_oproc = comstart; 464 tp->t_param = comparam; 465 tp->t_hwiflow = comhwiflow; 466 tty_attach(tp); 467 468 sc->sc_tty = tp; 469 sc->sc_rbuf = malloc(com_rbuf_size << 1, M_DEVBUF, M_WAITOK); 470 sc->sc_ebuf = sc->sc_rbuf + (com_rbuf_size << 1); 471 472 if (!ISSET(sc->sc_hwflags, COM_HW_NOIEN)) 473 SET(sc->sc_mcr, MCR_IENABLE); 474 475 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 476 int maj; 477 478 /* locate the major number */ 479 for (maj = 0; maj < nchrdev; maj++) 480 if (cdevsw[maj].d_open == comopen) 481 break; 482 483 cn_tab->cn_dev = makedev(maj, sc->sc_dev.dv_unit); 484 485 printf("%s: console\n", sc->sc_dev.dv_xname); 486 } 487 488 #ifdef KGDB 489 /* 490 * Allow kgdb to "take over" this port. If this is 491 * the kgdb device, it has exclusive use. 492 */ 493 if (iot == com_kgdb_iot && iobase == com_kgdb_addr) { 494 com_kgdb_attached = 1; 495 496 SET(sc->sc_hwflags, COM_HW_KGDB); 497 printf("%s: kgdb\n", sc->sc_dev.dv_xname); 498 } 499 #endif 500 501 #ifdef __GENERIC_SOFT_INTERRUPTS 502 sc->sc_si = softintr_establish(IPL_SOFTSERIAL, comsoft, sc); 503 #endif 504 505 #if NRND > 0 && defined(RND_COM) 506 rnd_attach_source(&sc->rnd_source, sc->sc_dev.dv_xname, 507 RND_TYPE_TTY); 508 #endif 509 510 /* if there are no enable/disable functions, assume the device 511 is always enabled */ 512 if (!sc->enable) 513 sc->enabled = 1; 514 515 com_config(sc); 516 } 517 518 void 519 com_config(sc) 520 struct com_softc *sc; 521 { 522 bus_space_tag_t iot = sc->sc_iot; 523 bus_space_handle_t ioh = sc->sc_ioh; 524 525 /* Disable interrupts before configuring the device. */ 526 sc->sc_ier = 0; 527 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 528 529 #ifdef COM_HAYESP 530 /* Look for a Hayes ESP board. */ 531 if (ISSET(sc->sc_hwflags, COM_HW_HAYESP)) { 532 sc->sc_fifolen = 1024; 533 534 /* Set 16550 compatibility mode */ 535 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD1, 536 HAYESP_SETMODE); 537 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 538 HAYESP_MODE_FIFO|HAYESP_MODE_RTS| 539 HAYESP_MODE_SCALE); 540 541 /* Set RTS/CTS flow control */ 542 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD1, 543 HAYESP_SETFLOWTYPE); 544 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 545 HAYESP_FLOW_RTS); 546 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 547 HAYESP_FLOW_CTS); 548 549 /* Set flow control levels */ 550 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD1, 551 HAYESP_SETRXFLOW); 552 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 553 HAYESP_HIBYTE(HAYESP_RXHIWMARK)); 554 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 555 HAYESP_LOBYTE(HAYESP_RXHIWMARK)); 556 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 557 HAYESP_HIBYTE(HAYESP_RXLOWMARK)); 558 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 559 HAYESP_LOBYTE(HAYESP_RXLOWMARK)); 560 } 561 #endif 562 563 #ifdef DDB 564 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) 565 com_enable_debugport(sc); 566 #endif 567 568 #ifdef KGDB 569 /* 570 * Allow kgdb to "take over" this port. If this is 571 * the kgdb device, it has exclusive use. 572 */ 573 if (ISSET(sc->sc_hwflags, COM_HW_KGDB)) 574 com_enable_debugport(sc); 575 #endif 576 } 577 578 int 579 comopen(dev, flag, mode, p) 580 dev_t dev; 581 int flag, mode; 582 struct proc *p; 583 { 584 int unit = COMUNIT(dev); 585 struct com_softc *sc; 586 struct tty *tp; 587 int s, s2; 588 int error = 0; 589 590 if (unit >= com_cd.cd_ndevs) 591 return (ENXIO); 592 sc = com_cd.cd_devs[unit]; 593 if (!sc) 594 return (ENXIO); 595 596 #ifdef KGDB 597 /* 598 * If this is the kgdb port, no other use is permitted. 599 */ 600 if (ISSET(sc->sc_hwflags, COM_HW_KGDB)) 601 return (EBUSY); 602 #endif 603 604 tp = sc->sc_tty; 605 606 if (ISSET(tp->t_state, TS_ISOPEN) && 607 ISSET(tp->t_state, TS_XCLUDE) && 608 p->p_ucred->cr_uid != 0) 609 return (EBUSY); 610 611 s = spltty(); 612 613 /* We need to set this early for the benefit of comsoft(). */ 614 SET(tp->t_state, TS_WOPEN); 615 616 /* 617 * Do the following iff this is a first open. 618 */ 619 if (!ISSET(tp->t_state, TS_ISOPEN)) { 620 struct termios t; 621 622 tp->t_dev = dev; 623 624 s2 = splserial(); 625 626 if (sc->enable) { 627 if ((*sc->enable)(sc)) { 628 printf("%s: device enable failed\n", 629 sc->sc_dev.dv_xname); 630 return (EIO); 631 } 632 sc->enabled = 1; 633 com_config(sc); 634 } 635 636 /* Turn on interrupts. */ 637 sc->sc_ier = IER_ERXRDY | IER_ERLS | IER_EMSC; 638 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 639 640 /* Fetch the current modem control status, needed later. */ 641 sc->sc_msr = bus_space_read_1(sc->sc_iot, sc->sc_ioh, com_msr); 642 643 splx(s2); 644 645 /* 646 * Initialize the termios status to the defaults. Add in the 647 * sticky bits from TIOCSFLAGS. 648 */ 649 t.c_ispeed = 0; 650 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 651 t.c_ospeed = comconsrate; 652 t.c_cflag = comconscflag; 653 } else { 654 t.c_ospeed = TTYDEF_SPEED; 655 t.c_cflag = TTYDEF_CFLAG; 656 } 657 if (ISSET(sc->sc_swflags, TIOCFLAG_CLOCAL)) 658 SET(t.c_cflag, CLOCAL); 659 if (ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS)) 660 SET(t.c_cflag, CRTSCTS); 661 if (ISSET(sc->sc_swflags, TIOCFLAG_MDMBUF)) 662 SET(t.c_cflag, MDMBUF); 663 /* Make sure comparam() will do something. */ 664 tp->t_ospeed = 0; 665 (void) comparam(tp, &t); 666 tp->t_iflag = TTYDEF_IFLAG; 667 tp->t_oflag = TTYDEF_OFLAG; 668 tp->t_lflag = TTYDEF_LFLAG; 669 ttychars(tp); 670 ttsetwater(tp); 671 672 /* 673 * Turn on DTR. We must always do this, even if carrier is not 674 * present, because otherwise we'd have to use TIOCSDTR 675 * immediately after setting CLOCAL, which applications do not 676 * expect. We always assert DTR while the device is open 677 * unless explicitly requested to deassert it. 678 */ 679 com_modem(sc, 1); 680 681 s2 = splserial(); 682 683 /* Clear the input ring, and unblock. */ 684 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 685 sc->sc_rbavail = com_rbuf_size; 686 com_iflush(sc); 687 CLR(sc->sc_rx_flags, RX_ANY_BLOCK); 688 com_hwiflow(sc); 689 690 #ifdef COM_DEBUG 691 if (com_debug) 692 comstatus(sc, "comopen "); 693 #endif 694 695 splx(s2); 696 } 697 error = 0; 698 699 /* If we're doing a blocking open... */ 700 if (!ISSET(flag, O_NONBLOCK)) 701 /* ...then wait for carrier. */ 702 while (!ISSET(tp->t_state, TS_CARR_ON) && 703 !ISSET(tp->t_cflag, CLOCAL | MDMBUF)) { 704 error = ttysleep(tp, &tp->t_rawq, TTIPRI | PCATCH, 705 ttopen, 0); 706 if (error) { 707 /* 708 * If the open was interrupted and nobody 709 * else has the device open, then hang up. 710 */ 711 if (!ISSET(tp->t_state, TS_ISOPEN)) { 712 com_modem(sc, 0); 713 CLR(tp->t_state, TS_WOPEN); 714 ttwakeup(tp); 715 } 716 break; 717 } 718 SET(tp->t_state, TS_WOPEN); 719 } 720 721 splx(s); 722 if (error == 0) 723 error = (*linesw[tp->t_line].l_open)(dev, tp); 724 return (error); 725 } 726 727 int 728 comclose(dev, flag, mode, p) 729 dev_t dev; 730 int flag, mode; 731 struct proc *p; 732 { 733 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 734 struct tty *tp = sc->sc_tty; 735 int s; 736 737 /* XXX This is for cons.c. */ 738 if (!ISSET(tp->t_state, TS_ISOPEN)) 739 return (0); 740 741 (*linesw[tp->t_line].l_close)(tp, flag); 742 ttyclose(tp); 743 744 s = splserial(); 745 746 /* If we were asserting flow control, then deassert it. */ 747 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 748 com_hwiflow(sc); 749 750 splx(s); 751 752 /* Clear any break condition set with TIOCSBRK. */ 753 com_break(sc, 0); 754 755 /* 756 * Hang up if necessary. Wait a bit, so the other side has time to 757 * notice even if we immediately open the port again. 758 */ 759 if (ISSET(tp->t_cflag, HUPCL)) { 760 com_modem(sc, 0); 761 (void) tsleep(sc, TTIPRI, ttclos, hz); 762 } 763 764 s = splserial(); 765 766 /* Turn off interrupts. */ 767 #ifdef DDB 768 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) 769 sc->sc_ier = IER_ERXRDY; /* interrupt on break */ 770 else 771 #endif 772 sc->sc_ier = 0; 773 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 774 775 if (sc->disable) { 776 if (sc->enabled) { 777 (*sc->disable)(sc); 778 sc->enabled = 0; 779 } 780 } 781 782 splx(s); 783 784 return (0); 785 } 786 787 int 788 comread(dev, uio, flag) 789 dev_t dev; 790 struct uio *uio; 791 int flag; 792 { 793 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 794 struct tty *tp = sc->sc_tty; 795 796 return ((*linesw[tp->t_line].l_read)(tp, uio, flag)); 797 } 798 799 int 800 comwrite(dev, uio, flag) 801 dev_t dev; 802 struct uio *uio; 803 int flag; 804 { 805 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 806 struct tty *tp = sc->sc_tty; 807 808 return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 809 } 810 811 struct tty * 812 comtty(dev) 813 dev_t dev; 814 { 815 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 816 struct tty *tp = sc->sc_tty; 817 818 return (tp); 819 } 820 821 static u_char 822 tiocm_xxx2mcr(data) 823 int data; 824 { 825 u_char m = 0; 826 827 if (ISSET(data, TIOCM_DTR)) 828 SET(m, MCR_DTR); 829 if (ISSET(data, TIOCM_RTS)) 830 SET(m, MCR_RTS); 831 return m; 832 } 833 834 int 835 comioctl(dev, cmd, data, flag, p) 836 dev_t dev; 837 u_long cmd; 838 caddr_t data; 839 int flag; 840 struct proc *p; 841 { 842 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 843 struct tty *tp = sc->sc_tty; 844 int error; 845 846 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); 847 if (error >= 0) 848 return (error); 849 850 error = ttioctl(tp, cmd, data, flag, p); 851 if (error >= 0) 852 return (error); 853 854 switch (cmd) { 855 case TIOCSBRK: 856 com_break(sc, 1); 857 break; 858 859 case TIOCCBRK: 860 com_break(sc, 0); 861 break; 862 863 case TIOCSDTR: 864 com_modem(sc, 1); 865 break; 866 867 case TIOCCDTR: 868 com_modem(sc, 0); 869 break; 870 871 case TIOCGFLAGS: 872 *(int *)data = sc->sc_swflags; 873 break; 874 875 case TIOCSFLAGS: 876 error = suser(p->p_ucred, &p->p_acflag); 877 if (error) 878 return (error); 879 sc->sc_swflags = *(int *)data; 880 break; 881 882 case TIOCMSET: 883 CLR(sc->sc_mcr, MCR_DTR | MCR_RTS); 884 /*FALLTHROUGH*/ 885 886 case TIOCMBIS: 887 SET(sc->sc_mcr, tiocm_xxx2mcr(*(int *)data)); 888 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_mcr, sc->sc_mcr); 889 break; 890 891 case TIOCMBIC: 892 CLR(sc->sc_mcr, tiocm_xxx2mcr(*(int *)data)); 893 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_mcr, sc->sc_mcr); 894 break; 895 896 case TIOCMGET: { 897 u_char m; 898 int bits = 0; 899 900 m = sc->sc_mcr; 901 if (ISSET(m, MCR_DTR)) 902 SET(bits, TIOCM_DTR); 903 if (ISSET(m, MCR_RTS)) 904 SET(bits, TIOCM_RTS); 905 m = sc->sc_msr; 906 if (ISSET(m, MSR_DCD)) 907 SET(bits, TIOCM_CD); 908 if (ISSET(m, MSR_CTS)) 909 SET(bits, TIOCM_CTS); 910 if (ISSET(m, MSR_DSR)) 911 SET(bits, TIOCM_DSR); 912 if (ISSET(m, MSR_RI | MSR_TERI)) 913 SET(bits, TIOCM_RI); 914 if (bus_space_read_1(sc->sc_iot, sc->sc_ioh, com_ier)) 915 SET(bits, TIOCM_LE); 916 *(int *)data = bits; 917 break; 918 } 919 default: 920 return (ENOTTY); 921 } 922 923 #ifdef COM_DEBUG 924 if (com_debug) 925 comstatus(sc, "comioctl "); 926 #endif 927 928 return (0); 929 } 930 931 integrate void 932 com_schedrx(sc) 933 struct com_softc *sc; 934 { 935 936 sc->sc_rx_ready = 1; 937 938 /* Wake up the poller. */ 939 #ifdef __GENERIC_SOFT_INTERRUPTS 940 softintr_schedule(sc->sc_si); 941 #else 942 #ifndef alpha 943 setsoftserial(); 944 #else 945 if (!com_softintr_scheduled) { 946 com_softintr_scheduled = 1; 947 timeout(comsoft, NULL, 1); 948 } 949 #endif 950 #endif 951 } 952 953 void 954 com_break(sc, onoff) 955 struct com_softc *sc; 956 int onoff; 957 { 958 int s; 959 960 s = splserial(); 961 if (onoff) 962 SET(sc->sc_lcr, LCR_SBREAK); 963 else 964 CLR(sc->sc_lcr, LCR_SBREAK); 965 966 if (!sc->sc_heldchange) { 967 if (sc->sc_tx_busy) { 968 sc->sc_heldtbc = sc->sc_tbc; 969 sc->sc_tbc = 0; 970 sc->sc_heldchange = 1; 971 } else 972 com_loadchannelregs(sc); 973 } 974 splx(s); 975 } 976 977 void 978 com_modem(sc, onoff) 979 struct com_softc *sc; 980 int onoff; 981 { 982 int s; 983 984 s = splserial(); 985 if (onoff) 986 SET(sc->sc_mcr, sc->sc_mcr_dtr); 987 else 988 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 989 990 if (!sc->sc_heldchange) { 991 if (sc->sc_tx_busy) { 992 sc->sc_heldtbc = sc->sc_tbc; 993 sc->sc_tbc = 0; 994 sc->sc_heldchange = 1; 995 } else 996 com_loadchannelregs(sc); 997 } 998 splx(s); 999 } 1000 1001 static u_char 1002 cflag2lcr(cflag) 1003 tcflag_t cflag; 1004 { 1005 u_char lcr = 0; 1006 1007 switch (ISSET(cflag, CSIZE)) { 1008 case CS5: 1009 SET(lcr, LCR_5BITS); 1010 break; 1011 case CS6: 1012 SET(lcr, LCR_6BITS); 1013 break; 1014 case CS7: 1015 SET(lcr, LCR_7BITS); 1016 break; 1017 case CS8: 1018 SET(lcr, LCR_8BITS); 1019 break; 1020 } 1021 if (ISSET(cflag, PARENB)) { 1022 SET(lcr, LCR_PENAB); 1023 if (!ISSET(cflag, PARODD)) 1024 SET(lcr, LCR_PEVEN); 1025 } 1026 if (ISSET(cflag, CSTOPB)) 1027 SET(lcr, LCR_STOPB); 1028 1029 return (lcr); 1030 } 1031 1032 int 1033 comparam(tp, t) 1034 struct tty *tp; 1035 struct termios *t; 1036 { 1037 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1038 int ospeed = comspeed(t->c_ospeed, sc->sc_frequency); 1039 u_char lcr; 1040 int s; 1041 1042 /* Check requested parameters. */ 1043 if (ospeed < 0) 1044 return (EINVAL); 1045 if (t->c_ispeed && t->c_ispeed != t->c_ospeed) 1046 return (EINVAL); 1047 1048 /* 1049 * For the console, always force CLOCAL and !HUPCL, so that the port 1050 * is always active. 1051 */ 1052 if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) || 1053 ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 1054 SET(t->c_cflag, CLOCAL); 1055 CLR(t->c_cflag, HUPCL); 1056 } 1057 1058 /* 1059 * If there were no changes, don't do anything. This avoids dropping 1060 * input and improves performance when all we did was frob things like 1061 * VMIN and VTIME. 1062 */ 1063 if (tp->t_ospeed == t->c_ospeed && 1064 tp->t_cflag == t->c_cflag) 1065 return (0); 1066 1067 lcr = ISSET(sc->sc_lcr, LCR_SBREAK) | cflag2lcr(t->c_cflag); 1068 1069 s = splserial(); 1070 1071 sc->sc_lcr = lcr; 1072 1073 /* 1074 * If we're not in a mode that assumes a connection is present, then 1075 * ignore carrier changes. 1076 */ 1077 if (ISSET(t->c_cflag, CLOCAL | MDMBUF)) 1078 sc->sc_msr_dcd = 0; 1079 else 1080 sc->sc_msr_dcd = MSR_DCD; 1081 /* 1082 * Set the flow control pins depending on the current flow control 1083 * mode. 1084 */ 1085 if (ISSET(t->c_cflag, CRTSCTS)) { 1086 sc->sc_mcr_dtr = MCR_DTR; 1087 sc->sc_mcr_rts = MCR_RTS; 1088 sc->sc_msr_cts = MSR_CTS; 1089 sc->sc_efr = EFR_AUTORTS | EFR_AUTOCTS; 1090 } else if (ISSET(t->c_cflag, MDMBUF)) { 1091 /* 1092 * For DTR/DCD flow control, make sure we don't toggle DTR for 1093 * carrier detection. 1094 */ 1095 sc->sc_mcr_dtr = 0; 1096 sc->sc_mcr_rts = MCR_DTR; 1097 sc->sc_msr_cts = MSR_DCD; 1098 sc->sc_efr = 0; 1099 } else { 1100 /* 1101 * If no flow control, then always set RTS. This will make 1102 * the other side happy if it mistakenly thinks we're doing 1103 * RTS/CTS flow control. 1104 */ 1105 sc->sc_mcr_dtr = MCR_DTR | MCR_RTS; 1106 sc->sc_mcr_rts = 0; 1107 sc->sc_msr_cts = 0; 1108 sc->sc_efr = 0; 1109 if (ISSET(sc->sc_mcr, MCR_DTR)) 1110 SET(sc->sc_mcr, MCR_RTS); 1111 else 1112 CLR(sc->sc_mcr, MCR_RTS); 1113 } 1114 sc->sc_msr_mask = sc->sc_msr_cts | sc->sc_msr_dcd; 1115 1116 #if 0 1117 if (ospeed == 0) 1118 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 1119 else 1120 SET(sc->sc_mcr, sc->sc_mcr_dtr); 1121 #endif 1122 1123 sc->sc_dlbl = ospeed; 1124 sc->sc_dlbh = ospeed >> 8; 1125 1126 /* 1127 * Set the FIFO threshold based on the receive speed. 1128 * 1129 * * If it's a low speed, it's probably a mouse or some other 1130 * interactive device, so set the threshold low. 1131 * * If it's a high speed, trim the trigger level down to prevent 1132 * overflows. 1133 * * Otherwise set it a bit higher. 1134 */ 1135 if (ISSET(sc->sc_hwflags, COM_HW_HAYESP)) 1136 sc->sc_fifo = FIFO_DMA_MODE | FIFO_ENABLE | FIFO_TRIGGER_8; 1137 else if (ISSET(sc->sc_hwflags, COM_HW_FIFO)) 1138 sc->sc_fifo = FIFO_ENABLE | 1139 (t->c_ospeed <= 1200 ? FIFO_TRIGGER_1 : 1140 t->c_ospeed <= 38400 ? FIFO_TRIGGER_8 : FIFO_TRIGGER_4); 1141 else 1142 sc->sc_fifo = 0; 1143 1144 /* And copy to tty. */ 1145 tp->t_ispeed = 0; 1146 tp->t_ospeed = t->c_ospeed; 1147 tp->t_cflag = t->c_cflag; 1148 1149 if (!sc->sc_heldchange) { 1150 if (sc->sc_tx_busy) { 1151 sc->sc_heldtbc = sc->sc_tbc; 1152 sc->sc_tbc = 0; 1153 sc->sc_heldchange = 1; 1154 } else 1155 com_loadchannelregs(sc); 1156 } 1157 1158 if (!ISSET(t->c_cflag, CHWFLOW)) { 1159 /* Disable the high water mark. */ 1160 sc->sc_r_hiwat = 0; 1161 sc->sc_r_lowat = 0; 1162 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1163 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1164 com_schedrx(sc); 1165 } 1166 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 1167 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 1168 com_hwiflow(sc); 1169 } 1170 } else { 1171 sc->sc_r_hiwat = com_rbuf_hiwat; 1172 sc->sc_r_lowat = com_rbuf_lowat; 1173 } 1174 1175 splx(s); 1176 1177 /* 1178 * Update the tty layer's idea of the carrier bit, in case we changed 1179 * CLOCAL or MDMBUF. We don't hang up here; we only do that by 1180 * explicit request. 1181 */ 1182 (void) (*linesw[tp->t_line].l_modem)(tp, ISSET(sc->sc_msr, MSR_DCD)); 1183 1184 #ifdef COM_DEBUG 1185 if (com_debug) 1186 comstatus(sc, "comparam "); 1187 #endif 1188 1189 if (!ISSET(t->c_cflag, CHWFLOW)) { 1190 if (sc->sc_tx_stopped) { 1191 sc->sc_tx_stopped = 0; 1192 comstart(tp); 1193 } 1194 } 1195 1196 return (0); 1197 } 1198 1199 void 1200 com_iflush(sc) 1201 struct com_softc *sc; 1202 { 1203 bus_space_tag_t iot = sc->sc_iot; 1204 bus_space_handle_t ioh = sc->sc_ioh; 1205 #ifdef DIAGNOSTIC 1206 int reg; 1207 #endif 1208 int timo; 1209 1210 #ifdef DIAGNOSTIC 1211 reg = 0xffff; 1212 #endif 1213 timo = 50000; 1214 /* flush any pending I/O */ 1215 while (ISSET(bus_space_read_1(iot, ioh, com_lsr), LSR_RXRDY) 1216 && --timo) 1217 #ifdef DIAGNOSTIC 1218 reg = 1219 #else 1220 (void) 1221 #endif 1222 bus_space_read_1(iot, ioh, com_data); 1223 #ifdef DIAGNOSTIC 1224 if (!timo) 1225 printf("%s: com_iflush timeout %02x\n", sc->sc_dev.dv_xname, 1226 reg); 1227 #endif 1228 } 1229 1230 void 1231 com_loadchannelregs(sc) 1232 struct com_softc *sc; 1233 { 1234 bus_space_tag_t iot = sc->sc_iot; 1235 bus_space_handle_t ioh = sc->sc_ioh; 1236 1237 /* XXXXX necessary? */ 1238 com_iflush(sc); 1239 1240 bus_space_write_1(iot, ioh, com_ier, 0); 1241 1242 if (ISSET(sc->sc_hwflags, COM_HW_FLOW)) { 1243 bus_space_write_1(iot, ioh, com_lcr, LCR_EERS); 1244 bus_space_write_1(iot, ioh, com_efr, sc->sc_efr); 1245 } 1246 bus_space_write_1(iot, ioh, com_lcr, sc->sc_lcr | LCR_DLAB); 1247 bus_space_write_1(iot, ioh, com_dlbl, sc->sc_dlbl); 1248 bus_space_write_1(iot, ioh, com_dlbh, sc->sc_dlbh); 1249 bus_space_write_1(iot, ioh, com_lcr, sc->sc_lcr); 1250 bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr_active = sc->sc_mcr); 1251 bus_space_write_1(iot, ioh, com_fifo, sc->sc_fifo); 1252 1253 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1254 } 1255 1256 int 1257 comhwiflow(tp, block) 1258 struct tty *tp; 1259 int block; 1260 { 1261 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1262 int s; 1263 1264 if (sc->sc_mcr_rts == 0) 1265 return (0); 1266 1267 s = splserial(); 1268 if (block) { 1269 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1270 SET(sc->sc_rx_flags, RX_TTY_BLOCKED); 1271 com_hwiflow(sc); 1272 } 1273 } else { 1274 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1275 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1276 com_schedrx(sc); 1277 } 1278 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1279 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED); 1280 com_hwiflow(sc); 1281 } 1282 } 1283 splx(s); 1284 return (1); 1285 } 1286 1287 /* 1288 * (un)block input via hw flowcontrol 1289 */ 1290 void 1291 com_hwiflow(sc) 1292 struct com_softc *sc; 1293 { 1294 bus_space_tag_t iot = sc->sc_iot; 1295 bus_space_handle_t ioh = sc->sc_ioh; 1296 1297 if (sc->sc_mcr_rts == 0) 1298 return; 1299 1300 if (ISSET(sc->sc_rx_flags, RX_ANY_BLOCK)) { 1301 CLR(sc->sc_mcr, sc->sc_mcr_rts); 1302 CLR(sc->sc_mcr_active, sc->sc_mcr_rts); 1303 } else { 1304 SET(sc->sc_mcr, sc->sc_mcr_rts); 1305 SET(sc->sc_mcr_active, sc->sc_mcr_rts); 1306 } 1307 bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr_active); 1308 } 1309 1310 1311 void 1312 comstart(tp) 1313 struct tty *tp; 1314 { 1315 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1316 bus_space_tag_t iot = sc->sc_iot; 1317 bus_space_handle_t ioh = sc->sc_ioh; 1318 int s; 1319 1320 s = spltty(); 1321 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 1322 goto out; 1323 if (sc->sc_tx_stopped) 1324 goto out; 1325 1326 if (tp->t_outq.c_cc <= tp->t_lowat) { 1327 if (ISSET(tp->t_state, TS_ASLEEP)) { 1328 CLR(tp->t_state, TS_ASLEEP); 1329 wakeup(&tp->t_outq); 1330 } 1331 selwakeup(&tp->t_wsel); 1332 if (tp->t_outq.c_cc == 0) 1333 goto out; 1334 } 1335 1336 /* Grab the first contiguous region of buffer space. */ 1337 { 1338 u_char *tba; 1339 int tbc; 1340 1341 tba = tp->t_outq.c_cf; 1342 tbc = ndqb(&tp->t_outq, 0); 1343 1344 (void)splserial(); 1345 1346 sc->sc_tba = tba; 1347 sc->sc_tbc = tbc; 1348 } 1349 1350 SET(tp->t_state, TS_BUSY); 1351 sc->sc_tx_busy = 1; 1352 1353 /* Enable transmit completion interrupts if necessary. */ 1354 if (!ISSET(sc->sc_ier, IER_ETXRDY)) { 1355 SET(sc->sc_ier, IER_ETXRDY); 1356 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1357 } 1358 1359 /* Output the first chunk of the contiguous buffer. */ 1360 { 1361 int n; 1362 1363 n = sc->sc_tbc; 1364 if (n > sc->sc_fifolen) 1365 n = sc->sc_fifolen; 1366 bus_space_write_multi_1(iot, ioh, com_data, sc->sc_tba, n); 1367 sc->sc_tbc -= n; 1368 sc->sc_tba += n; 1369 } 1370 out: 1371 splx(s); 1372 return; 1373 } 1374 1375 /* 1376 * Stop output on a line. 1377 */ 1378 void 1379 comstop(tp, flag) 1380 struct tty *tp; 1381 int flag; 1382 { 1383 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1384 int s; 1385 1386 s = splserial(); 1387 if (ISSET(tp->t_state, TS_BUSY)) { 1388 /* Stop transmitting at the next chunk. */ 1389 sc->sc_tbc = 0; 1390 sc->sc_heldtbc = 0; 1391 if (!ISSET(tp->t_state, TS_TTSTOP)) 1392 SET(tp->t_state, TS_FLUSH); 1393 } 1394 splx(s); 1395 } 1396 1397 void 1398 comdiag(arg) 1399 void *arg; 1400 { 1401 struct com_softc *sc = arg; 1402 int overflows, floods; 1403 int s; 1404 1405 s = splserial(); 1406 overflows = sc->sc_overflows; 1407 sc->sc_overflows = 0; 1408 floods = sc->sc_floods; 1409 sc->sc_floods = 0; 1410 sc->sc_errors = 0; 1411 splx(s); 1412 1413 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1414 sc->sc_dev.dv_xname, 1415 overflows, overflows == 1 ? "" : "s", 1416 floods, floods == 1 ? "" : "s"); 1417 } 1418 1419 integrate void 1420 com_rxsoft(sc, tp) 1421 struct com_softc *sc; 1422 struct tty *tp; 1423 { 1424 int (*rint) __P((int c, struct tty *tp)) = linesw[tp->t_line].l_rint; 1425 u_char *get, *end; 1426 u_int cc, scc; 1427 u_char lsr; 1428 int code; 1429 int s; 1430 1431 end = sc->sc_ebuf; 1432 get = sc->sc_rbget; 1433 scc = cc = com_rbuf_size - sc->sc_rbavail; 1434 1435 if (cc == com_rbuf_size) { 1436 sc->sc_floods++; 1437 if (sc->sc_errors++ == 0) 1438 timeout(comdiag, sc, 60 * hz); 1439 } 1440 1441 while (cc) { 1442 code = get[0]; 1443 lsr = get[1]; 1444 if (ISSET(lsr, LSR_OE | LSR_BI | LSR_FE | LSR_PE)) { 1445 if (ISSET(lsr, LSR_OE)) { 1446 sc->sc_overflows++; 1447 if (sc->sc_errors++ == 0) 1448 timeout(comdiag, sc, 60 * hz); 1449 } 1450 if (ISSET(lsr, LSR_BI | LSR_FE)) 1451 SET(code, TTY_FE); 1452 if (ISSET(lsr, LSR_PE)) 1453 SET(code, TTY_PE); 1454 } 1455 if ((*rint)(code, tp) == -1) { 1456 /* 1457 * The line discipline's buffer is out of space. 1458 */ 1459 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1460 /* 1461 * We're either not using flow control, or the 1462 * line discipline didn't tell us to block for 1463 * some reason. Either way, we have no way to 1464 * know when there's more space available, so 1465 * just drop the rest of the data. 1466 */ 1467 get += cc << 1; 1468 if (get >= end) 1469 get -= com_rbuf_size << 1; 1470 cc = 0; 1471 } else { 1472 /* 1473 * Don't schedule any more receive processing 1474 * until the line discipline tells us there's 1475 * space available (through comhwiflow()). 1476 * Leave the rest of the data in the input 1477 * buffer. 1478 */ 1479 SET(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1480 } 1481 break; 1482 } 1483 get += 2; 1484 if (get >= end) 1485 get = sc->sc_rbuf; 1486 cc--; 1487 } 1488 1489 if (cc != scc) { 1490 sc->sc_rbget = get; 1491 s = splserial(); 1492 cc = sc->sc_rbavail += scc - cc; 1493 /* Buffers should be ok again, release possible block. */ 1494 if (cc >= sc->sc_r_lowat) { 1495 if (ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1496 CLR(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1497 SET(sc->sc_ier, IER_ERXRDY); 1498 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 1499 } 1500 if (ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED)) { 1501 CLR(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1502 com_hwiflow(sc); 1503 } 1504 } 1505 splx(s); 1506 } 1507 } 1508 1509 integrate void 1510 com_txsoft(sc, tp) 1511 struct com_softc *sc; 1512 struct tty *tp; 1513 { 1514 1515 CLR(tp->t_state, TS_BUSY); 1516 if (ISSET(tp->t_state, TS_FLUSH)) 1517 CLR(tp->t_state, TS_FLUSH); 1518 else 1519 ndflush(&tp->t_outq, (int)(sc->sc_tba - tp->t_outq.c_cf)); 1520 (*linesw[tp->t_line].l_start)(tp); 1521 } 1522 1523 integrate void 1524 com_stsoft(sc, tp) 1525 struct com_softc *sc; 1526 struct tty *tp; 1527 { 1528 u_char msr, delta; 1529 int s; 1530 1531 s = splserial(); 1532 msr = sc->sc_msr; 1533 delta = sc->sc_msr_delta; 1534 sc->sc_msr_delta = 0; 1535 splx(s); 1536 1537 if (ISSET(delta, sc->sc_msr_dcd)) { 1538 /* 1539 * Inform the tty layer that carrier detect changed. 1540 */ 1541 (void) (*linesw[tp->t_line].l_modem)(tp, ISSET(msr, MSR_DCD)); 1542 } 1543 1544 if (ISSET(delta, sc->sc_msr_cts)) { 1545 /* Block or unblock output according to flow control. */ 1546 if (ISSET(msr, sc->sc_msr_cts)) { 1547 sc->sc_tx_stopped = 0; 1548 (*linesw[tp->t_line].l_start)(tp); 1549 } else { 1550 sc->sc_tx_stopped = 1; 1551 } 1552 } 1553 1554 #ifdef COM_DEBUG 1555 if (com_debug) 1556 comstatus(sc, "com_stsoft"); 1557 #endif 1558 } 1559 1560 #ifdef __GENERIC_SOFT_INTERRUPTS 1561 void 1562 comsoft(arg) 1563 void *arg; 1564 { 1565 struct com_softc *sc = arg; 1566 struct tty *tp; 1567 1568 if (!sc->enabled) 1569 return; 1570 1571 { 1572 #else 1573 void 1574 #ifndef alpha 1575 comsoft() 1576 #else 1577 comsoft(arg) 1578 void *arg; 1579 #endif 1580 { 1581 struct com_softc *sc; 1582 struct tty *tp; 1583 int unit; 1584 #ifdef alpha 1585 int s; 1586 1587 s = splsoftserial(); 1588 com_softintr_scheduled = 0; 1589 #endif 1590 1591 for (unit = 0; unit < com_cd.cd_ndevs; unit++) { 1592 sc = com_cd.cd_devs[unit]; 1593 if (sc == NULL) 1594 continue; 1595 1596 if (!sc->enabled) 1597 continue; 1598 1599 tp = sc->sc_tty; 1600 if (tp == NULL || !ISSET(tp->t_state, TS_ISOPEN | TS_WOPEN)) 1601 continue; 1602 #endif 1603 tp = sc->sc_tty; 1604 1605 if (sc->sc_rx_ready) { 1606 sc->sc_rx_ready = 0; 1607 com_rxsoft(sc, tp); 1608 } 1609 1610 if (sc->sc_st_check) { 1611 sc->sc_st_check = 0; 1612 com_stsoft(sc, tp); 1613 } 1614 1615 if (sc->sc_tx_done) { 1616 sc->sc_tx_done = 0; 1617 com_txsoft(sc, tp); 1618 } 1619 } 1620 1621 #ifndef __GENERIC_SOFT_INTERRUPTS 1622 #ifdef alpha 1623 splx(s); 1624 #endif 1625 #endif 1626 } 1627 1628 int 1629 comintr(arg) 1630 void *arg; 1631 { 1632 struct com_softc *sc = arg; 1633 bus_space_tag_t iot = sc->sc_iot; 1634 bus_space_handle_t ioh = sc->sc_ioh; 1635 u_char *put, *end; 1636 u_int cc; 1637 u_char lsr, iir; 1638 1639 if (!sc->enabled) 1640 return (0); 1641 1642 iir = bus_space_read_1(iot, ioh, com_iir); 1643 if (ISSET(iir, IIR_NOPEND)) 1644 return (0); 1645 1646 end = sc->sc_ebuf; 1647 put = sc->sc_rbput; 1648 cc = sc->sc_rbavail; 1649 1650 do { 1651 u_char msr, delta; 1652 1653 lsr = bus_space_read_1(iot, ioh, com_lsr); 1654 #if defined(DDB) || defined(KGDB) 1655 if (ISSET(lsr, LSR_BI)) { 1656 #ifdef DDB 1657 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 1658 Debugger(); 1659 continue; 1660 } 1661 #endif 1662 #ifdef KGDB 1663 if (ISSET(sc->sc_hwflags, COM_HW_KGDB)) { 1664 kgdb_connect(1); 1665 continue; 1666 } 1667 #endif 1668 } 1669 #endif /* DDB || KGDB */ 1670 1671 if (ISSET(lsr, LSR_RCV_MASK) && 1672 !ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1673 while (cc > 0) { 1674 put[0] = bus_space_read_1(iot, ioh, com_data); 1675 put[1] = lsr; 1676 put += 2; 1677 if (put >= end) 1678 put = sc->sc_rbuf; 1679 cc--; 1680 1681 lsr = bus_space_read_1(iot, ioh, com_lsr); 1682 if (!ISSET(lsr, LSR_RCV_MASK)) 1683 break; 1684 } 1685 1686 /* 1687 * Current string of incoming characters ended because 1688 * no more data was available or we ran out of space. 1689 * Schedule a receive event if any data was received. 1690 * If we're out of space, turn off receive interrupts. 1691 */ 1692 sc->sc_rbput = put; 1693 sc->sc_rbavail = cc; 1694 if (!ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) 1695 sc->sc_rx_ready = 1; 1696 1697 /* 1698 * See if we are in danger of overflowing a buffer. If 1699 * so, use hardware flow control to ease the pressure. 1700 */ 1701 if (!ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED) && 1702 cc < sc->sc_r_hiwat) { 1703 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1704 com_hwiflow(sc); 1705 } 1706 1707 /* 1708 * If we're out of space, disable receive interrupts 1709 * until the queue has drained a bit. 1710 */ 1711 if (!cc) { 1712 SET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1713 CLR(sc->sc_ier, IER_ERXRDY); 1714 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1715 } 1716 } else { 1717 if ((iir & IIR_IMASK) == IIR_RXRDY) { 1718 bus_space_write_1(iot, ioh, com_ier, 0); 1719 delay(10); 1720 bus_space_write_1(iot, ioh, com_ier,sc->sc_ier); 1721 iir = IIR_NOPEND; 1722 continue; 1723 } 1724 } 1725 1726 msr = bus_space_read_1(iot, ioh, com_msr); 1727 delta = msr ^ sc->sc_msr; 1728 sc->sc_msr = msr; 1729 if (ISSET(delta, sc->sc_msr_mask)) { 1730 SET(sc->sc_msr_delta, delta); 1731 1732 /* 1733 * Stop output immediately if we lose the output 1734 * flow control signal or carrier detect. 1735 */ 1736 if (ISSET(~msr, sc->sc_msr_mask)) { 1737 sc->sc_tbc = 0; 1738 sc->sc_heldtbc = 0; 1739 #ifdef COM_DEBUG 1740 if (com_debug) 1741 comstatus(sc, "comintr "); 1742 #endif 1743 } 1744 1745 sc->sc_st_check = 1; 1746 } 1747 } while (!ISSET((iir = bus_space_read_1(iot, ioh, com_iir)), IIR_NOPEND)); 1748 1749 /* 1750 * Done handling any receive interrupts. See if data can be 1751 * transmitted as well. Schedule tx done event if no data left 1752 * and tty was marked busy. 1753 */ 1754 if (ISSET(lsr, LSR_TXRDY)) { 1755 /* 1756 * If we've delayed a parameter change, do it now, and restart 1757 * output. 1758 */ 1759 if (sc->sc_heldchange) { 1760 com_loadchannelregs(sc); 1761 sc->sc_heldchange = 0; 1762 sc->sc_tbc = sc->sc_heldtbc; 1763 sc->sc_heldtbc = 0; 1764 } 1765 1766 /* Output the next chunk of the contiguous buffer, if any. */ 1767 if (sc->sc_tbc > 0) { 1768 int n; 1769 1770 n = sc->sc_tbc; 1771 if (n > sc->sc_fifolen) 1772 n = sc->sc_fifolen; 1773 bus_space_write_multi_1(iot, ioh, com_data, sc->sc_tba, n); 1774 sc->sc_tbc -= n; 1775 sc->sc_tba += n; 1776 } else { 1777 /* Disable transmit completion interrupts if necessary. */ 1778 if (ISSET(sc->sc_ier, IER_ETXRDY)) { 1779 CLR(sc->sc_ier, IER_ETXRDY); 1780 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1781 } 1782 if (sc->sc_tx_busy) { 1783 sc->sc_tx_busy = 0; 1784 sc->sc_tx_done = 1; 1785 } 1786 } 1787 } 1788 1789 /* Wake up the poller. */ 1790 #ifdef __GENERIC_SOFT_INTERRUPTS 1791 softintr_schedule(sc->sc_si); 1792 #else 1793 #ifndef alpha 1794 setsoftserial(); 1795 #else 1796 if (!com_softintr_scheduled) { 1797 com_softintr_scheduled = 1; 1798 timeout(comsoft, NULL, 1); 1799 } 1800 #endif 1801 #endif 1802 1803 #if NRND > 0 && defined(RND_COM) 1804 rnd_add_uint32(&sc->rnd_source, iir | lsr); 1805 #endif 1806 1807 return (1); 1808 } 1809 1810 /* 1811 * The following functions are polled getc and putc routines, shared 1812 * by the console and kgdb glue. 1813 */ 1814 1815 int 1816 com_common_getc(iot, ioh) 1817 bus_space_tag_t iot; 1818 bus_space_handle_t ioh; 1819 { 1820 int s = splserial(); 1821 u_char stat, c; 1822 int timo; 1823 1824 timo = 50000; 1825 while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_RXRDY) 1826 && --timo) 1827 ; 1828 #ifdef DIAGNOSTIC 1829 if (!timo) 1830 printf("com_common_getc timeout\n"); 1831 #endif 1832 c = bus_space_read_1(iot, ioh, com_data); 1833 stat = bus_space_read_1(iot, ioh, com_iir); 1834 splx(s); 1835 return (c); 1836 } 1837 1838 void 1839 com_common_putc(iot, ioh, c) 1840 bus_space_tag_t iot; 1841 bus_space_handle_t ioh; 1842 int c; 1843 { 1844 int s = splserial(); 1845 u_char stat; 1846 int timo; 1847 1848 /* wait for any pending transmission to finish */ 1849 timo = 50000; 1850 while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_TXRDY) 1851 && --timo) 1852 ; 1853 #ifdef DIAGNOSTIC 1854 if (!timo) 1855 printf("com_common_putc flush timeout\n"); 1856 #endif 1857 bus_space_write_1(iot, ioh, com_data, c); 1858 /* wait for this transmission to complete */ 1859 timo = 1500000; 1860 while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_TXRDY) 1861 && --timo) 1862 ; 1863 #ifdef DIAGNOSTIC 1864 if (!timo) 1865 printf("com_common_putc wait timeout\n"); 1866 #endif 1867 /* clear any interrupts generated by this transmission */ 1868 stat = bus_space_read_1(iot, ioh, com_iir); 1869 splx(s); 1870 } 1871 1872 /* 1873 * Initialize UART to known state. 1874 */ 1875 int 1876 cominit(iot, iobase, rate, frequency, cflag, iohp) 1877 bus_space_tag_t iot; 1878 int iobase; 1879 int rate, frequency; 1880 tcflag_t cflag; 1881 bus_space_handle_t *iohp; 1882 { 1883 bus_space_handle_t ioh; 1884 1885 if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) 1886 return (ENOMEM); /* ??? */ 1887 1888 bus_space_write_1(iot, ioh, com_lcr, LCR_EERS); 1889 bus_space_write_1(iot, ioh, com_efr, 0); 1890 bus_space_write_1(iot, ioh, com_lcr, LCR_DLAB); 1891 rate = comspeed(rate, frequency); 1892 bus_space_write_1(iot, ioh, com_dlbl, rate); 1893 bus_space_write_1(iot, ioh, com_dlbh, rate >> 8); 1894 bus_space_write_1(iot, ioh, com_lcr, cflag2lcr(cflag)); 1895 bus_space_write_1(iot, ioh, com_mcr, 0); 1896 bus_space_write_1(iot, ioh, com_fifo, 1897 FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_1); 1898 bus_space_write_1(iot, ioh, com_ier, 0); 1899 1900 *iohp = ioh; 1901 return (0); 1902 } 1903 1904 /* 1905 * Following are all routines needed for COM to act as console 1906 */ 1907 1908 int 1909 comcnattach(iot, iobase, rate, frequency, cflag) 1910 bus_space_tag_t iot; 1911 int iobase; 1912 int rate, frequency; 1913 tcflag_t cflag; 1914 { 1915 int res; 1916 static struct consdev comcons = { 1917 NULL, NULL, comcngetc, comcnputc, comcnpollc, NODEV, CN_NORMAL 1918 }; 1919 1920 res = cominit(iot, iobase, rate, frequency, cflag, &comconsioh); 1921 if (res) 1922 return (res); 1923 1924 cn_tab = &comcons; 1925 1926 comconstag = iot; 1927 comconsaddr = iobase; 1928 comconsrate = rate; 1929 comconscflag = cflag; 1930 1931 return (0); 1932 } 1933 1934 int 1935 comcngetc(dev) 1936 dev_t dev; 1937 { 1938 1939 return (com_common_getc(comconstag, comconsioh)); 1940 } 1941 1942 /* 1943 * Console kernel output character routine. 1944 */ 1945 void 1946 comcnputc(dev, c) 1947 dev_t dev; 1948 int c; 1949 { 1950 1951 com_common_putc(comconstag, comconsioh, c); 1952 } 1953 1954 void 1955 comcnpollc(dev, on) 1956 dev_t dev; 1957 int on; 1958 { 1959 1960 } 1961 1962 #ifdef KGDB 1963 int 1964 com_kgdb_attach(iot, iobase, rate, frequency, cflag) 1965 bus_space_tag_t iot; 1966 int iobase; 1967 int rate, frequency; 1968 tcflag_t cflag; 1969 { 1970 int res; 1971 1972 if (iot == comconstag && iobase == comconsaddr) 1973 return (EBUSY); /* cannot share with console */ 1974 1975 res = cominit(iot, iobase, rate, frequency, cflag, &com_kgdb_ioh); 1976 if (res) 1977 return (res); 1978 1979 kgdb_attach(com_kgdb_getc, com_kgdb_putc, NULL); 1980 kgdb_dev = 123; /* unneeded, only to satisfy some tests */ 1981 1982 com_kgdb_iot = iot; 1983 com_kgdb_addr = iobase; 1984 1985 return (0); 1986 } 1987 1988 /* ARGSUSED */ 1989 int 1990 com_kgdb_getc(arg) 1991 void *arg; 1992 { 1993 1994 return (com_common_getc(com_kgdb_iot, com_kgdb_ioh)); 1995 } 1996 1997 /* ARGSUSED */ 1998 void 1999 com_kgdb_putc(arg, c) 2000 void *arg; 2001 int c; 2002 { 2003 2004 return (com_common_putc(com_kgdb_iot, com_kgdb_ioh, c)); 2005 } 2006 #endif /* KGDB */ 2007 2008 /* helper function to identify the com ports used by 2009 console or KGDB (and not yet autoconf attached) */ 2010 int 2011 com_is_console(iot, iobase, ioh) 2012 bus_space_tag_t iot; 2013 int iobase; 2014 bus_space_handle_t *ioh; 2015 { 2016 bus_space_handle_t help; 2017 2018 if (!comconsattached && 2019 iot == comconstag && iobase == comconsaddr) 2020 help = comconsioh; 2021 #ifdef KGDB 2022 else if (!com_kgdb_attached && 2023 iot == com_kgdb_iot && iobase == com_kgdb_addr) 2024 help = com_kgdb_ioh; 2025 #endif 2026 else 2027 return (0); 2028 2029 if (ioh) 2030 *ioh = help; 2031 return (1); 2032 } 2033
Indexes created Thu Sep 25 16:09:42 GMT 2025