plcom.c revision 1.28.10.1
1 /* $NetBSD: plcom.c,v 1.28.10.1 2009/05/13 17:16:38 jym Exp $ */ 2 3 /*- 4 * Copyright (c) 2001 ARM Ltd 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the company may not be used to endorse or promote 16 * products derived from this software without specific prior written 17 * permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 20 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 21 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 23 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 24 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 25 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * Copyright (c) 1998, 1999 The NetBSD Foundation, Inc. 32 * All rights reserved. 33 * 34 * This code is derived from software contributed to The NetBSD Foundation 35 * by Charles M. Hannum. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 46 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 47 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 48 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 49 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 50 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 51 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 52 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 53 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 54 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 55 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 56 * POSSIBILITY OF SUCH DAMAGE. 57 */ 58 59 /* 60 * Copyright (c) 1991 The Regents of the University of California. 61 * All rights reserved. 62 * 63 * Redistribution and use in source and binary forms, with or without 64 * modification, are permitted provided that the following conditions 65 * are met: 66 * 1. Redistributions of source code must retain the above copyright 67 * notice, this list of conditions and the following disclaimer. 68 * 2. Redistributions in binary form must reproduce the above copyright 69 * notice, this list of conditions and the following disclaimer in the 70 * documentation and/or other materials provided with the distribution. 71 * 3. Neither the name of the University nor the names of its contributors 72 * may be used to endorse or promote products derived from this software 73 * without specific prior written permission. 74 * 75 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 76 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 77 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 78 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 79 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 80 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 81 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 82 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 83 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 84 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 85 * SUCH DAMAGE. 86 * 87 * @(#)com.c 7.5 (Berkeley) 5/16/91 88 */ 89 90 /* 91 * COM driver for the Prime Cell PL010 UART, which is similar to the 16C550, 92 * but has a completely different programmer's model. 93 * Derived from the NS16550AF com driver. 94 */ 95 96 #include <sys/cdefs.h> 97 __KERNEL_RCSID(0, "$NetBSD: plcom.c,v 1.28.10.1 2009/05/13 17:16:38 jym Exp $"); 98 99 #include "opt_plcom.h" 100 #include "opt_ddb.h" 101 #include "opt_kgdb.h" 102 #include "opt_lockdebug.h" 103 #include "opt_multiprocessor.h" 104 105 #include "rnd.h" 106 #if NRND > 0 && defined(RND_COM) 107 #include <sys/rnd.h> 108 #endif 109 110 /* 111 * Override cnmagic(9) macro before including <sys/systm.h>. 112 * We need to know if cn_check_magic triggered debugger, so set a flag. 113 * Callers of cn_check_magic must declare int cn_trapped = 0; 114 * XXX: this is *ugly*! 115 */ 116 #define cn_trap() \ 117 do { \ 118 console_debugger(); \ 119 cn_trapped = 1; \ 120 } while (/* CONSTCOND */ 0) 121 122 #include <sys/param.h> 123 #include <sys/systm.h> 124 #include <sys/ioctl.h> 125 #include <sys/select.h> 126 #include <sys/tty.h> 127 #include <sys/proc.h> 128 #include <sys/user.h> 129 #include <sys/conf.h> 130 #include <sys/file.h> 131 #include <sys/uio.h> 132 #include <sys/kernel.h> 133 #include <sys/syslog.h> 134 #include <sys/types.h> 135 #include <sys/device.h> 136 #include <sys/malloc.h> 137 #include <sys/timepps.h> 138 #include <sys/vnode.h> 139 #include <sys/kauth.h> 140 #include <sys/intr.h> 141 #include <sys/bus.h> 142 143 #include <evbarm/dev/plcomreg.h> 144 #include <evbarm/dev/plcomvar.h> 145 146 #include <dev/cons.h> 147 148 static void plcom_enable_debugport (struct plcom_softc *); 149 150 void plcom_config (struct plcom_softc *); 151 void plcom_shutdown (struct plcom_softc *); 152 int plcomspeed (long, long); 153 static u_char cflag2lcr (tcflag_t); 154 int plcomparam (struct tty *, struct termios *); 155 void plcomstart (struct tty *); 156 int plcomhwiflow (struct tty *, int); 157 158 void plcom_loadchannelregs (struct plcom_softc *); 159 void plcom_hwiflow (struct plcom_softc *); 160 void plcom_break (struct plcom_softc *, int); 161 void plcom_modem (struct plcom_softc *, int); 162 void tiocm_to_plcom (struct plcom_softc *, u_long, int); 163 int plcom_to_tiocm (struct plcom_softc *); 164 void plcom_iflush (struct plcom_softc *); 165 166 int plcom_common_getc (dev_t, bus_space_tag_t, bus_space_handle_t); 167 void plcom_common_putc (dev_t, bus_space_tag_t, bus_space_handle_t, int); 168 169 int plcominit (bus_space_tag_t, bus_addr_t, int, int, tcflag_t, 170 bus_space_handle_t *); 171 172 dev_type_open(plcomopen); 173 dev_type_close(plcomclose); 174 dev_type_read(plcomread); 175 dev_type_write(plcomwrite); 176 dev_type_ioctl(plcomioctl); 177 dev_type_stop(plcomstop); 178 dev_type_tty(plcomtty); 179 dev_type_poll(plcompoll); 180 181 int plcomcngetc (dev_t); 182 void plcomcnputc (dev_t, int); 183 void plcomcnpollc (dev_t, int); 184 185 #define integrate static inline 186 void plcomsoft (void *); 187 integrate void plcom_rxsoft (struct plcom_softc *, struct tty *); 188 integrate void plcom_txsoft (struct plcom_softc *, struct tty *); 189 integrate void plcom_stsoft (struct plcom_softc *, struct tty *); 190 integrate void plcom_schedrx (struct plcom_softc *); 191 void plcomdiag (void *); 192 193 extern struct cfdriver plcom_cd; 194 195 const struct cdevsw plcom_cdevsw = { 196 plcomopen, plcomclose, plcomread, plcomwrite, plcomioctl, 197 plcomstop, plcomtty, plcompoll, nommap, ttykqfilter, D_TTY 198 }; 199 200 /* 201 * Make this an option variable one can patch. 202 * But be warned: this must be a power of 2! 203 */ 204 u_int plcom_rbuf_size = PLCOM_RING_SIZE; 205 206 /* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */ 207 u_int plcom_rbuf_hiwat = (PLCOM_RING_SIZE * 1) / 4; 208 u_int plcom_rbuf_lowat = (PLCOM_RING_SIZE * 3) / 4; 209 210 static int plcomconsunit = -1; 211 static bus_space_tag_t plcomconstag; 212 static bus_space_handle_t plcomconsioh; 213 static int plcomconsattached; 214 static int plcomconsrate; 215 static tcflag_t plcomconscflag; 216 static struct cnm_state plcom_cnm_state; 217 218 static int ppscap = 219 PPS_TSFMT_TSPEC | 220 PPS_CAPTUREASSERT | 221 PPS_CAPTURECLEAR | 222 #ifdef PPS_SYNC 223 PPS_HARDPPSONASSERT | PPS_HARDPPSONCLEAR | 224 #endif /* PPS_SYNC */ 225 PPS_OFFSETASSERT | PPS_OFFSETCLEAR; 226 227 #ifdef KGDB 228 #include <sys/kgdb.h> 229 230 static int plcom_kgdb_unit; 231 static bus_space_tag_t plcom_kgdb_iot; 232 static bus_space_handle_t plcom_kgdb_ioh; 233 static int plcom_kgdb_attached; 234 235 int plcom_kgdb_getc (void *); 236 void plcom_kgdb_putc (void *, int); 237 #endif /* KGDB */ 238 239 #define PLCOMUNIT_MASK 0x7ffff 240 #define PLCOMDIALOUT_MASK 0x80000 241 242 #define PLCOMUNIT(x) (minor(x) & PLCOMUNIT_MASK) 243 #define PLCOMDIALOUT(x) (minor(x) & PLCOMDIALOUT_MASK) 244 245 #define PLCOM_ISALIVE(sc) ((sc)->enabled != 0 && \ 246 device_is_active(&(sc)->sc_dev)) 247 248 #define BR BUS_SPACE_BARRIER_READ 249 #define BW BUS_SPACE_BARRIER_WRITE 250 #define PLCOM_BARRIER(t, h, f) bus_space_barrier((t), (h), 0, PLCOM_UART_SIZE, (f)) 251 252 #define PLCOM_LOCK(sc) simple_lock(&(sc)->sc_lock) 253 #define PLCOM_UNLOCK(sc) simple_unlock(&(sc)->sc_lock) 254 255 int 256 plcomspeed(long speed, long frequency) 257 { 258 #define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */ 259 260 int x, err; 261 262 #if 0 263 if (speed == 0) 264 return 0; 265 #endif 266 if (speed <= 0) 267 return -1; 268 x = divrnd(frequency / 16, speed); 269 if (x <= 0) 270 return -1; 271 err = divrnd(((quad_t)frequency) * 1000 / 16, speed * x) - 1000; 272 if (err < 0) 273 err = -err; 274 if (err > PLCOM_TOLERANCE) 275 return -1; 276 return x; 277 278 #undef divrnd 279 } 280 281 #ifdef PLCOM_DEBUG 282 int plcom_debug = 0; 283 284 void plcomstatus (struct plcom_softc *, char *); 285 void 286 plcomstatus(struct plcom_softc *sc, char *str) 287 { 288 struct tty *tp = sc->sc_tty; 289 290 printf("%s: %s %sclocal %sdcd %sts_carr_on %sdtr %stx_stopped\n", 291 sc->sc_dev.dv_xname, str, 292 ISSET(tp->t_cflag, CLOCAL) ? "+" : "-", 293 ISSET(sc->sc_msr, MSR_DCD) ? "+" : "-", 294 ISSET(tp->t_state, TS_CARR_ON) ? "+" : "-", 295 ISSET(sc->sc_mcr, MCR_DTR) ? "+" : "-", 296 sc->sc_tx_stopped ? "+" : "-"); 297 298 printf("%s: %s %scrtscts %scts %sts_ttstop %srts %xrx_flags\n", 299 sc->sc_dev.dv_xname, str, 300 ISSET(tp->t_cflag, CRTSCTS) ? "+" : "-", 301 ISSET(sc->sc_msr, MSR_CTS) ? "+" : "-", 302 ISSET(tp->t_state, TS_TTSTOP) ? "+" : "-", 303 ISSET(sc->sc_mcr, MCR_RTS) ? "+" : "-", 304 sc->sc_rx_flags); 305 } 306 #endif 307 308 int 309 plcomprobe1(bus_space_tag_t iot, bus_space_handle_t ioh) 310 { 311 int data; 312 313 /* Disable the UART. */ 314 bus_space_write_1(iot, ioh, plcom_cr, 0); 315 /* Make sure the FIFO is off. */ 316 bus_space_write_1(iot, ioh, plcom_lcr, LCR_8BITS); 317 /* Disable interrupts. */ 318 bus_space_write_1(iot, ioh, plcom_iir, 0); 319 320 /* Make sure we swallow anything in the receiving register. */ 321 data = bus_space_read_1(iot, ioh, plcom_dr); 322 323 if (bus_space_read_1(iot, ioh, plcom_lcr) != LCR_8BITS) 324 return 0; 325 326 data = bus_space_read_1(iot, ioh, plcom_fr) & (FR_RXFF | FR_RXFE); 327 328 if (data != FR_RXFE) 329 return 0; 330 331 return 1; 332 } 333 334 static void 335 plcom_enable_debugport(struct plcom_softc *sc) 336 { 337 int s; 338 339 /* Turn on line break interrupt, set carrier. */ 340 s = splserial(); 341 PLCOM_LOCK(sc); 342 sc->sc_cr = CR_RIE | CR_RTIE | CR_UARTEN; 343 bus_space_write_1(sc->sc_iot, sc->sc_ioh, plcom_cr, sc->sc_cr); 344 SET(sc->sc_mcr, MCR_DTR | MCR_RTS); 345 /* XXX device_unit() abuse */ 346 sc->sc_set_mcr(sc->sc_set_mcr_arg, device_unit(&sc->sc_dev), 347 sc->sc_mcr); 348 PLCOM_UNLOCK(sc); 349 splx(s); 350 } 351 352 void 353 plcom_attach_subr(struct plcom_softc *sc) 354 { 355 int unit = sc->sc_iounit; 356 bus_space_tag_t iot = sc->sc_iot; 357 bus_space_handle_t ioh = sc->sc_ioh; 358 struct tty *tp; 359 360 callout_init(&sc->sc_diag_callout, 0); 361 simple_lock_init(&sc->sc_lock); 362 363 /* Disable interrupts before configuring the device. */ 364 sc->sc_cr = 0; 365 366 if (plcomconstag && unit == plcomconsunit) { 367 plcomconsattached = 1; 368 369 plcomconstag = iot; 370 plcomconsioh = ioh; 371 372 /* Make sure the console is always "hardwired". */ 373 delay(1000); /* wait for output to finish */ 374 SET(sc->sc_hwflags, PLCOM_HW_CONSOLE); 375 SET(sc->sc_swflags, TIOCFLAG_SOFTCAR); 376 /* Must re-enable the console immediately, or we will 377 hang when trying to print. */ 378 sc->sc_cr = CR_UARTEN; 379 } 380 381 bus_space_write_1(iot, ioh, plcom_cr, sc->sc_cr); 382 383 /* The PL010 has a 16-byte fifo, but the tx interrupt triggers when 384 there is space for 8 more bytes. */ 385 sc->sc_fifolen = 8; 386 printf("\n"); 387 388 if (ISSET(sc->sc_hwflags, PLCOM_HW_TXFIFO_DISABLE)) { 389 sc->sc_fifolen = 1; 390 printf("%s: txfifo disabled\n", sc->sc_dev.dv_xname); 391 } 392 393 if (sc->sc_fifolen > 1) 394 SET(sc->sc_hwflags, PLCOM_HW_FIFO); 395 396 tp = ttymalloc(); 397 tp->t_oproc = plcomstart; 398 tp->t_param = plcomparam; 399 tp->t_hwiflow = plcomhwiflow; 400 401 sc->sc_tty = tp; 402 sc->sc_rbuf = malloc(plcom_rbuf_size << 1, M_DEVBUF, M_NOWAIT); 403 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 404 sc->sc_rbavail = plcom_rbuf_size; 405 if (sc->sc_rbuf == NULL) { 406 printf("%s: unable to allocate ring buffer\n", 407 sc->sc_dev.dv_xname); 408 return; 409 } 410 sc->sc_ebuf = sc->sc_rbuf + (plcom_rbuf_size << 1); 411 412 tty_attach(tp); 413 414 if (ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE)) { 415 int maj; 416 417 /* locate the major number */ 418 maj = cdevsw_lookup_major(&plcom_cdevsw); 419 420 cn_tab->cn_dev = makedev(maj, device_unit(&sc->sc_dev)); 421 422 printf("%s: console\n", sc->sc_dev.dv_xname); 423 } 424 425 #ifdef KGDB 426 /* 427 * Allow kgdb to "take over" this port. If this is 428 * the kgdb device, it has exclusive use. 429 */ 430 if (iot == plcom_kgdb_iot && unit == plcom_kgdb_unit) { 431 plcom_kgdb_attached = 1; 432 433 SET(sc->sc_hwflags, PLCOM_HW_KGDB); 434 printf("%s: kgdb\n", sc->sc_dev.dv_xname); 435 } 436 #endif 437 438 sc->sc_si = softint_establish(SOFTINT_SERIAL, plcomsoft, sc); 439 440 #if NRND > 0 && defined(RND_COM) 441 rnd_attach_source(&sc->rnd_source, sc->sc_dev.dv_xname, 442 RND_TYPE_TTY, 0); 443 #endif 444 445 /* if there are no enable/disable functions, assume the device 446 is always enabled */ 447 if (!sc->enable) 448 sc->enabled = 1; 449 450 plcom_config(sc); 451 452 SET(sc->sc_hwflags, PLCOM_HW_DEV_OK); 453 } 454 455 void 456 plcom_config(struct plcom_softc *sc) 457 { 458 bus_space_tag_t iot = sc->sc_iot; 459 bus_space_handle_t ioh = sc->sc_ioh; 460 461 /* Disable interrupts before configuring the device. */ 462 sc->sc_cr = 0; 463 bus_space_write_1(iot, ioh, plcom_cr, sc->sc_cr); 464 465 if (ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE|PLCOM_HW_KGDB)) 466 plcom_enable_debugport(sc); 467 } 468 469 int 470 plcom_detach(struct device *self, int flags) 471 { 472 struct plcom_softc *sc = (struct plcom_softc *)self; 473 int maj, mn; 474 475 /* locate the major number */ 476 maj = cdevsw_lookup_major(&plcom_cdevsw); 477 478 /* Nuke the vnodes for any open instances. */ 479 mn = device_unit(self); 480 vdevgone(maj, mn, mn, VCHR); 481 482 mn |= PLCOMDIALOUT_MASK; 483 vdevgone(maj, mn, mn, VCHR); 484 485 /* Free the receive buffer. */ 486 free(sc->sc_rbuf, M_DEVBUF); 487 488 /* Detach and free the tty. */ 489 tty_detach(sc->sc_tty); 490 ttyfree(sc->sc_tty); 491 492 /* Unhook the soft interrupt handler. */ 493 softint_disestablish(sc->sc_si); 494 495 #if NRND > 0 && defined(RND_COM) 496 /* Unhook the entropy source. */ 497 rnd_detach_source(&sc->rnd_source); 498 #endif 499 500 return 0; 501 } 502 503 int 504 plcom_activate(struct device *self, enum devact act) 505 { 506 struct plcom_softc *sc = (struct plcom_softc *)self; 507 int s, rv = 0; 508 509 s = splserial(); 510 PLCOM_LOCK(sc); 511 switch (act) { 512 case DVACT_ACTIVATE: 513 rv = EOPNOTSUPP; 514 break; 515 516 case DVACT_DEACTIVATE: 517 if (sc->sc_hwflags & (PLCOM_HW_CONSOLE|PLCOM_HW_KGDB)) { 518 rv = EBUSY; 519 break; 520 } 521 522 if (sc->disable != NULL && sc->enabled != 0) { 523 (*sc->disable)(sc); 524 sc->enabled = 0; 525 } 526 break; 527 } 528 529 PLCOM_UNLOCK(sc); 530 splx(s); 531 return rv; 532 } 533 534 void 535 plcom_shutdown(struct plcom_softc *sc) 536 { 537 struct tty *tp = sc->sc_tty; 538 int s; 539 540 s = splserial(); 541 PLCOM_LOCK(sc); 542 543 /* If we were asserting flow control, then deassert it. */ 544 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 545 plcom_hwiflow(sc); 546 547 /* Clear any break condition set with TIOCSBRK. */ 548 plcom_break(sc, 0); 549 550 /* Turn off PPS capture on last close. */ 551 mutex_spin_enter(&timecounter_lock); 552 sc->sc_ppsmask = 0; 553 sc->ppsparam.mode = 0; 554 mutex_spin_exit(&timecounter_lock); 555 556 /* 557 * Hang up if necessary. Wait a bit, so the other side has time to 558 * notice even if we immediately open the port again. 559 * Avoid tsleeping above splhigh(). 560 */ 561 if (ISSET(tp->t_cflag, HUPCL)) { 562 plcom_modem(sc, 0); 563 PLCOM_UNLOCK(sc); 564 splx(s); 565 /* XXX tsleep will only timeout */ 566 (void) tsleep(sc, TTIPRI, ttclos, hz); 567 s = splserial(); 568 PLCOM_LOCK(sc); 569 } 570 571 /* Turn off interrupts. */ 572 if (ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE)) 573 /* interrupt on break */ 574 sc->sc_cr = CR_RIE | CR_RTIE | CR_UARTEN; 575 else 576 sc->sc_cr = 0; 577 bus_space_write_1(sc->sc_iot, sc->sc_ioh, plcom_cr, sc->sc_cr); 578 579 if (sc->disable) { 580 #ifdef DIAGNOSTIC 581 if (!sc->enabled) 582 panic("plcom_shutdown: not enabled?"); 583 #endif 584 (*sc->disable)(sc); 585 sc->enabled = 0; 586 } 587 PLCOM_UNLOCK(sc); 588 splx(s); 589 } 590 591 int 592 plcomopen(dev_t dev, int flag, int mode, struct lwp *l) 593 { 594 struct plcom_softc *sc; 595 struct tty *tp; 596 int s, s2; 597 int error; 598 599 sc = device_lookup_private(&plcom_cd, PLCOMUNIT(dev)); 600 if (sc == NULL || !ISSET(sc->sc_hwflags, PLCOM_HW_DEV_OK) || 601 sc->sc_rbuf == NULL) 602 return ENXIO; 603 604 if (!device_is_active(&sc->sc_dev)) 605 return ENXIO; 606 607 #ifdef KGDB 608 /* 609 * If this is the kgdb port, no other use is permitted. 610 */ 611 if (ISSET(sc->sc_hwflags, PLCOM_HW_KGDB)) 612 return EBUSY; 613 #endif 614 615 tp = sc->sc_tty; 616 617 if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp)) 618 return (EBUSY); 619 620 s = spltty(); 621 622 /* 623 * Do the following iff this is a first open. 624 */ 625 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 626 struct termios t; 627 628 tp->t_dev = dev; 629 630 s2 = splserial(); 631 PLCOM_LOCK(sc); 632 633 if (sc->enable) { 634 if ((*sc->enable)(sc)) { 635 PLCOM_UNLOCK(sc); 636 splx(s2); 637 splx(s); 638 printf("%s: device enable failed\n", 639 sc->sc_dev.dv_xname); 640 return EIO; 641 } 642 sc->enabled = 1; 643 plcom_config(sc); 644 } 645 646 /* Turn on interrupts. */ 647 /* IER_ERXRDY | IER_ERLS | IER_EMSC; */ 648 sc->sc_cr = CR_RIE | CR_RTIE | CR_MSIE | CR_UARTEN; 649 bus_space_write_1(sc->sc_iot, sc->sc_ioh, plcom_cr, sc->sc_cr); 650 651 /* Fetch the current modem control status, needed later. */ 652 sc->sc_msr = bus_space_read_1(sc->sc_iot, sc->sc_ioh, plcom_fr); 653 654 /* Clear PPS capture state on first open. */ 655 656 mutex_spin_enter(&timecounter_lock); 657 sc->sc_ppsmask = 0; 658 sc->ppsparam.mode = 0; 659 mutex_spin_exit(&timecounter_lock); 660 661 PLCOM_UNLOCK(sc); 662 splx(s2); 663 664 /* 665 * Initialize the termios status to the defaults. Add in the 666 * sticky bits from TIOCSFLAGS. 667 */ 668 t.c_ispeed = 0; 669 if (ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE)) { 670 t.c_ospeed = plcomconsrate; 671 t.c_cflag = plcomconscflag; 672 } else { 673 t.c_ospeed = TTYDEF_SPEED; 674 t.c_cflag = TTYDEF_CFLAG; 675 } 676 if (ISSET(sc->sc_swflags, TIOCFLAG_CLOCAL)) 677 SET(t.c_cflag, CLOCAL); 678 if (ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS)) 679 SET(t.c_cflag, CRTSCTS); 680 if (ISSET(sc->sc_swflags, TIOCFLAG_MDMBUF)) 681 SET(t.c_cflag, MDMBUF); 682 /* Make sure plcomparam() will do something. */ 683 tp->t_ospeed = 0; 684 (void) plcomparam(tp, &t); 685 tp->t_iflag = TTYDEF_IFLAG; 686 tp->t_oflag = TTYDEF_OFLAG; 687 tp->t_lflag = TTYDEF_LFLAG; 688 ttychars(tp); 689 ttsetwater(tp); 690 691 s2 = splserial(); 692 PLCOM_LOCK(sc); 693 694 /* 695 * Turn on DTR. We must always do this, even if carrier is not 696 * present, because otherwise we'd have to use TIOCSDTR 697 * immediately after setting CLOCAL, which applications do not 698 * expect. We always assert DTR while the device is open 699 * unless explicitly requested to deassert it. 700 */ 701 plcom_modem(sc, 1); 702 703 /* Clear the input ring, and unblock. */ 704 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 705 sc->sc_rbavail = plcom_rbuf_size; 706 plcom_iflush(sc); 707 CLR(sc->sc_rx_flags, RX_ANY_BLOCK); 708 plcom_hwiflow(sc); 709 710 #ifdef PLCOM_DEBUG 711 if (plcom_debug) 712 plcomstatus(sc, "plcomopen "); 713 #endif 714 715 PLCOM_UNLOCK(sc); 716 splx(s2); 717 } 718 719 splx(s); 720 721 error = ttyopen(tp, PLCOMDIALOUT(dev), ISSET(flag, O_NONBLOCK)); 722 if (error) 723 goto bad; 724 725 error = (*tp->t_linesw->l_open)(dev, tp); 726 if (error) 727 goto bad; 728 729 return 0; 730 731 bad: 732 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 733 /* 734 * We failed to open the device, and nobody else had it opened. 735 * Clean up the state as appropriate. 736 */ 737 plcom_shutdown(sc); 738 } 739 740 return error; 741 } 742 743 int 744 plcomclose(dev_t dev, int flag, int mode, struct lwp *l) 745 { 746 struct plcom_softc *sc = 747 device_lookup_private(&plcom_cd, PLCOMUNIT(dev)); 748 struct tty *tp = sc->sc_tty; 749 750 /* XXX This is for cons.c. */ 751 if (!ISSET(tp->t_state, TS_ISOPEN)) 752 return 0; 753 754 (*tp->t_linesw->l_close)(tp, flag); 755 ttyclose(tp); 756 757 if (PLCOM_ISALIVE(sc) == 0) 758 return 0; 759 760 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 761 /* 762 * Although we got a last close, the device may still be in 763 * use; e.g. if this was the dialout node, and there are still 764 * processes waiting for carrier on the non-dialout node. 765 */ 766 plcom_shutdown(sc); 767 } 768 769 return 0; 770 } 771 772 int 773 plcomread(dev_t dev, struct uio *uio, int flag) 774 { 775 struct plcom_softc *sc = 776 device_lookup_private(&plcom_cd, PLCOMUNIT(dev)); 777 struct tty *tp = sc->sc_tty; 778 779 if (PLCOM_ISALIVE(sc) == 0) 780 return EIO; 781 782 return (*tp->t_linesw->l_read)(tp, uio, flag); 783 } 784 785 int 786 plcomwrite(dev_t dev, struct uio *uio, int flag) 787 { 788 struct plcom_softc *sc = 789 device_lookup_private(&plcom_cd, PLCOMUNIT(dev)); 790 struct tty *tp = sc->sc_tty; 791 792 if (PLCOM_ISALIVE(sc) == 0) 793 return EIO; 794 795 return (*tp->t_linesw->l_write)(tp, uio, flag); 796 } 797 798 int 799 plcompoll(dev_t dev, int events, struct lwp *l) 800 { 801 struct plcom_softc *sc = 802 device_lookup_private(&plcom_cd, PLCOMUNIT(dev)); 803 struct tty *tp = sc->sc_tty; 804 805 if (PLCOM_ISALIVE(sc) == 0) 806 return EIO; 807 808 return (*tp->t_linesw->l_poll)(tp, events, l); 809 } 810 811 struct tty * 812 plcomtty(dev_t dev) 813 { 814 struct plcom_softc *sc = 815 device_lookup_private(&plcom_cd, PLCOMUNIT(dev)); 816 struct tty *tp = sc->sc_tty; 817 818 return tp; 819 } 820 821 int 822 plcomioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 823 { 824 struct plcom_softc *sc = 825 device_lookup_private(&plcom_cd, PLCOMUNIT(dev)); 826 struct tty *tp = sc->sc_tty; 827 int error; 828 int s; 829 830 if (PLCOM_ISALIVE(sc) == 0) 831 return EIO; 832 833 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 834 if (error != EPASSTHROUGH) 835 return error; 836 837 error = ttioctl(tp, cmd, data, flag, l); 838 if (error != EPASSTHROUGH) 839 return error; 840 841 error = 0; 842 843 s = splserial(); 844 PLCOM_LOCK(sc); 845 846 switch (cmd) { 847 case TIOCSBRK: 848 plcom_break(sc, 1); 849 break; 850 851 case TIOCCBRK: 852 plcom_break(sc, 0); 853 break; 854 855 case TIOCSDTR: 856 plcom_modem(sc, 1); 857 break; 858 859 case TIOCCDTR: 860 plcom_modem(sc, 0); 861 break; 862 863 case TIOCGFLAGS: 864 *(int *)data = sc->sc_swflags; 865 break; 866 867 case TIOCSFLAGS: 868 error = kauth_authorize_device_tty(l->l_cred, 869 KAUTH_DEVICE_TTY_PRIVSET, tp); 870 if (error) 871 break; 872 sc->sc_swflags = *(int *)data; 873 break; 874 875 case TIOCMSET: 876 case TIOCMBIS: 877 case TIOCMBIC: 878 tiocm_to_plcom(sc, cmd, *(int *)data); 879 break; 880 881 case TIOCMGET: 882 *(int *)data = plcom_to_tiocm(sc); 883 break; 884 885 case PPS_IOC_CREATE: 886 break; 887 888 case PPS_IOC_DESTROY: 889 break; 890 891 case PPS_IOC_GETPARAMS: { 892 pps_params_t *pp; 893 pp = (pps_params_t *)data; 894 mutex_spin_enter(&timecounter_lock); 895 *pp = sc->ppsparam; 896 mutex_spin_exit(&timecounter_lock); 897 break; 898 } 899 900 case PPS_IOC_SETPARAMS: { 901 pps_params_t *pp; 902 int mode; 903 pp = (pps_params_t *)data; 904 mutex_spin_enter(&timecounter_lock); 905 if (pp->mode & ~ppscap) { 906 error = EINVAL; 907 mutex_spin_exit(&timecounter_lock); 908 break; 909 } 910 sc->ppsparam = *pp; 911 /* 912 * Compute msr masks from user-specified timestamp state. 913 */ 914 mode = sc->ppsparam.mode; 915 #ifdef PPS_SYNC 916 if (mode & PPS_HARDPPSONASSERT) { 917 mode |= PPS_CAPTUREASSERT; 918 /* XXX revoke any previous HARDPPS source */ 919 } 920 if (mode & PPS_HARDPPSONCLEAR) { 921 mode |= PPS_CAPTURECLEAR; 922 /* XXX revoke any previous HARDPPS source */ 923 } 924 #endif /* PPS_SYNC */ 925 switch (mode & PPS_CAPTUREBOTH) { 926 case 0: 927 sc->sc_ppsmask = 0; 928 break; 929 930 case PPS_CAPTUREASSERT: 931 sc->sc_ppsmask = MSR_DCD; 932 sc->sc_ppsassert = MSR_DCD; 933 sc->sc_ppsclear = -1; 934 break; 935 936 case PPS_CAPTURECLEAR: 937 sc->sc_ppsmask = MSR_DCD; 938 sc->sc_ppsassert = -1; 939 sc->sc_ppsclear = 0; 940 break; 941 942 case PPS_CAPTUREBOTH: 943 sc->sc_ppsmask = MSR_DCD; 944 sc->sc_ppsassert = MSR_DCD; 945 sc->sc_ppsclear = 0; 946 break; 947 948 default: 949 error = EINVAL; 950 break; 951 } 952 mutex_spin_exit(&timecounter_lock); 953 break; 954 } 955 956 case PPS_IOC_GETCAP: 957 *(int*)data = ppscap; 958 break; 959 960 case PPS_IOC_FETCH: { 961 pps_info_t *pi; 962 pi = (pps_info_t *)data; 963 mutex_spin_enter(&timecounter_lock); 964 *pi = sc->ppsinfo; 965 mutex_spin_exit(&timecounter_lock); 966 break; 967 } 968 969 case TIOCDCDTIMESTAMP: /* XXX old, overloaded API used by xntpd v3 */ 970 /* 971 * Some GPS clocks models use the falling rather than 972 * rising edge as the on-the-second signal. 973 * The old API has no way to specify PPS polarity. 974 */ 975 mutex_spin_enter(&timecounter_lock); 976 sc->sc_ppsmask = MSR_DCD; 977 #ifndef PPS_TRAILING_EDGE 978 sc->sc_ppsassert = MSR_DCD; 979 sc->sc_ppsclear = -1; 980 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 981 &sc->ppsinfo.assert_timestamp); 982 #else 983 sc->sc_ppsassert = -1 984 sc->sc_ppsclear = 0; 985 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 986 &sc->ppsinfo.clear_timestamp); 987 #endif 988 mutex_spin_exit(&timecounter_lock); 989 break; 990 991 default: 992 error = EPASSTHROUGH; 993 break; 994 } 995 996 PLCOM_UNLOCK(sc); 997 splx(s); 998 999 #ifdef PLCOM_DEBUG 1000 if (plcom_debug) 1001 plcomstatus(sc, "plcomioctl "); 1002 #endif 1003 1004 return error; 1005 } 1006 1007 integrate void 1008 plcom_schedrx(struct plcom_softc *sc) 1009 { 1010 1011 sc->sc_rx_ready = 1; 1012 1013 /* Wake up the poller. */ 1014 softint_schedule(sc->sc_si); 1015 } 1016 1017 void 1018 plcom_break(struct plcom_softc *sc, int onoff) 1019 { 1020 1021 if (onoff) 1022 SET(sc->sc_lcr, LCR_BRK); 1023 else 1024 CLR(sc->sc_lcr, LCR_BRK); 1025 1026 if (!sc->sc_heldchange) { 1027 if (sc->sc_tx_busy) { 1028 sc->sc_heldtbc = sc->sc_tbc; 1029 sc->sc_tbc = 0; 1030 sc->sc_heldchange = 1; 1031 } else 1032 plcom_loadchannelregs(sc); 1033 } 1034 } 1035 1036 void 1037 plcom_modem(struct plcom_softc *sc, int onoff) 1038 { 1039 1040 if (sc->sc_mcr_dtr == 0) 1041 return; 1042 1043 if (onoff) 1044 SET(sc->sc_mcr, sc->sc_mcr_dtr); 1045 else 1046 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 1047 1048 if (!sc->sc_heldchange) { 1049 if (sc->sc_tx_busy) { 1050 sc->sc_heldtbc = sc->sc_tbc; 1051 sc->sc_tbc = 0; 1052 sc->sc_heldchange = 1; 1053 } else 1054 plcom_loadchannelregs(sc); 1055 } 1056 } 1057 1058 void 1059 tiocm_to_plcom(struct plcom_softc *sc, u_long how, int ttybits) 1060 { 1061 u_char plcombits; 1062 1063 plcombits = 0; 1064 if (ISSET(ttybits, TIOCM_DTR)) 1065 SET(plcombits, MCR_DTR); 1066 if (ISSET(ttybits, TIOCM_RTS)) 1067 SET(plcombits, MCR_RTS); 1068 1069 switch (how) { 1070 case TIOCMBIC: 1071 CLR(sc->sc_mcr, plcombits); 1072 break; 1073 1074 case TIOCMBIS: 1075 SET(sc->sc_mcr, plcombits); 1076 break; 1077 1078 case TIOCMSET: 1079 CLR(sc->sc_mcr, MCR_DTR | MCR_RTS); 1080 SET(sc->sc_mcr, plcombits); 1081 break; 1082 } 1083 1084 if (!sc->sc_heldchange) { 1085 if (sc->sc_tx_busy) { 1086 sc->sc_heldtbc = sc->sc_tbc; 1087 sc->sc_tbc = 0; 1088 sc->sc_heldchange = 1; 1089 } else 1090 plcom_loadchannelregs(sc); 1091 } 1092 } 1093 1094 int 1095 plcom_to_tiocm(struct plcom_softc *sc) 1096 { 1097 u_char plcombits; 1098 int ttybits = 0; 1099 1100 plcombits = sc->sc_mcr; 1101 if (ISSET(plcombits, MCR_DTR)) 1102 SET(ttybits, TIOCM_DTR); 1103 if (ISSET(plcombits, MCR_RTS)) 1104 SET(ttybits, TIOCM_RTS); 1105 1106 plcombits = sc->sc_msr; 1107 if (ISSET(plcombits, MSR_DCD)) 1108 SET(ttybits, TIOCM_CD); 1109 if (ISSET(plcombits, MSR_CTS)) 1110 SET(ttybits, TIOCM_CTS); 1111 if (ISSET(plcombits, MSR_DSR)) 1112 SET(ttybits, TIOCM_DSR); 1113 1114 if (sc->sc_cr != 0) 1115 SET(ttybits, TIOCM_LE); 1116 1117 return ttybits; 1118 } 1119 1120 static u_char 1121 cflag2lcr(tcflag_t cflag) 1122 { 1123 u_char lcr = 0; 1124 1125 switch (ISSET(cflag, CSIZE)) { 1126 case CS5: 1127 SET(lcr, LCR_5BITS); 1128 break; 1129 case CS6: 1130 SET(lcr, LCR_6BITS); 1131 break; 1132 case CS7: 1133 SET(lcr, LCR_7BITS); 1134 break; 1135 case CS8: 1136 SET(lcr, LCR_8BITS); 1137 break; 1138 } 1139 if (ISSET(cflag, PARENB)) { 1140 SET(lcr, LCR_PEN); 1141 if (!ISSET(cflag, PARODD)) 1142 SET(lcr, LCR_EPS); 1143 } 1144 if (ISSET(cflag, CSTOPB)) 1145 SET(lcr, LCR_STP2); 1146 1147 return lcr; 1148 } 1149 1150 int 1151 plcomparam(struct tty *tp, struct termios *t) 1152 { 1153 struct plcom_softc *sc = 1154 device_lookup_private(&plcom_cd, PLCOMUNIT(tp->t_dev)); 1155 int ospeed; 1156 u_char lcr; 1157 int s; 1158 1159 if (PLCOM_ISALIVE(sc) == 0) 1160 return EIO; 1161 1162 ospeed = plcomspeed(t->c_ospeed, sc->sc_frequency); 1163 1164 /* Check requested parameters. */ 1165 if (ospeed < 0) 1166 return EINVAL; 1167 if (t->c_ispeed && t->c_ispeed != t->c_ospeed) 1168 return EINVAL; 1169 1170 /* 1171 * For the console, always force CLOCAL and !HUPCL, so that the port 1172 * is always active. 1173 */ 1174 if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) || 1175 ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE)) { 1176 SET(t->c_cflag, CLOCAL); 1177 CLR(t->c_cflag, HUPCL); 1178 } 1179 1180 /* 1181 * If there were no changes, don't do anything. This avoids dropping 1182 * input and improves performance when all we did was frob things like 1183 * VMIN and VTIME. 1184 */ 1185 if (tp->t_ospeed == t->c_ospeed && 1186 tp->t_cflag == t->c_cflag) 1187 return 0; 1188 1189 lcr = ISSET(sc->sc_lcr, LCR_BRK) | cflag2lcr(t->c_cflag); 1190 1191 s = splserial(); 1192 PLCOM_LOCK(sc); 1193 1194 sc->sc_lcr = lcr; 1195 1196 /* 1197 * PL010 has a fixed-length FIFO trigger point. 1198 */ 1199 if (ISSET(sc->sc_hwflags, PLCOM_HW_FIFO)) 1200 sc->sc_fifo = 1; 1201 else 1202 sc->sc_fifo = 0; 1203 1204 if (sc->sc_fifo) 1205 SET(sc->sc_lcr, LCR_FEN); 1206 1207 /* 1208 * If we're not in a mode that assumes a connection is present, then 1209 * ignore carrier changes. 1210 */ 1211 if (ISSET(t->c_cflag, CLOCAL | MDMBUF)) 1212 sc->sc_msr_dcd = 0; 1213 else 1214 sc->sc_msr_dcd = MSR_DCD; 1215 /* 1216 * Set the flow control pins depending on the current flow control 1217 * mode. 1218 */ 1219 if (ISSET(t->c_cflag, CRTSCTS)) { 1220 sc->sc_mcr_dtr = MCR_DTR; 1221 sc->sc_mcr_rts = MCR_RTS; 1222 sc->sc_msr_cts = MSR_CTS; 1223 } else if (ISSET(t->c_cflag, MDMBUF)) { 1224 /* 1225 * For DTR/DCD flow control, make sure we don't toggle DTR for 1226 * carrier detection. 1227 */ 1228 sc->sc_mcr_dtr = 0; 1229 sc->sc_mcr_rts = MCR_DTR; 1230 sc->sc_msr_cts = MSR_DCD; 1231 } else { 1232 /* 1233 * If no flow control, then always set RTS. This will make 1234 * the other side happy if it mistakenly thinks we're doing 1235 * RTS/CTS flow control. 1236 */ 1237 sc->sc_mcr_dtr = MCR_DTR | MCR_RTS; 1238 sc->sc_mcr_rts = 0; 1239 sc->sc_msr_cts = 0; 1240 if (ISSET(sc->sc_mcr, MCR_DTR)) 1241 SET(sc->sc_mcr, MCR_RTS); 1242 else 1243 CLR(sc->sc_mcr, MCR_RTS); 1244 } 1245 sc->sc_msr_mask = sc->sc_msr_cts | sc->sc_msr_dcd; 1246 1247 #if 0 1248 if (ospeed == 0) 1249 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 1250 else 1251 SET(sc->sc_mcr, sc->sc_mcr_dtr); 1252 #endif 1253 1254 sc->sc_dlbl = ospeed; 1255 sc->sc_dlbh = ospeed >> 8; 1256 1257 /* And copy to tty. */ 1258 tp->t_ispeed = 0; 1259 tp->t_ospeed = t->c_ospeed; 1260 tp->t_cflag = t->c_cflag; 1261 1262 if (!sc->sc_heldchange) { 1263 if (sc->sc_tx_busy) { 1264 sc->sc_heldtbc = sc->sc_tbc; 1265 sc->sc_tbc = 0; 1266 sc->sc_heldchange = 1; 1267 } else 1268 plcom_loadchannelregs(sc); 1269 } 1270 1271 if (!ISSET(t->c_cflag, CHWFLOW)) { 1272 /* Disable the high water mark. */ 1273 sc->sc_r_hiwat = 0; 1274 sc->sc_r_lowat = 0; 1275 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1276 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1277 plcom_schedrx(sc); 1278 } 1279 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 1280 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 1281 plcom_hwiflow(sc); 1282 } 1283 } else { 1284 sc->sc_r_hiwat = plcom_rbuf_hiwat; 1285 sc->sc_r_lowat = plcom_rbuf_lowat; 1286 } 1287 1288 PLCOM_UNLOCK(sc); 1289 splx(s); 1290 1291 /* 1292 * Update the tty layer's idea of the carrier bit, in case we changed 1293 * CLOCAL or MDMBUF. We don't hang up here; we only do that by 1294 * explicit request. 1295 */ 1296 (void) (*tp->t_linesw->l_modem)(tp, ISSET(sc->sc_msr, MSR_DCD)); 1297 1298 #ifdef PLCOM_DEBUG 1299 if (plcom_debug) 1300 plcomstatus(sc, "plcomparam "); 1301 #endif 1302 1303 if (!ISSET(t->c_cflag, CHWFLOW)) { 1304 if (sc->sc_tx_stopped) { 1305 sc->sc_tx_stopped = 0; 1306 plcomstart(tp); 1307 } 1308 } 1309 1310 return 0; 1311 } 1312 1313 void 1314 plcom_iflush(struct plcom_softc *sc) 1315 { 1316 bus_space_tag_t iot = sc->sc_iot; 1317 bus_space_handle_t ioh = sc->sc_ioh; 1318 #ifdef DIAGNOSTIC 1319 int reg; 1320 #endif 1321 int timo; 1322 1323 #ifdef DIAGNOSTIC 1324 reg = 0xffff; 1325 #endif 1326 timo = 50000; 1327 /* flush any pending I/O */ 1328 while (! ISSET(bus_space_read_1(iot, ioh, plcom_fr), FR_RXFE) 1329 && --timo) 1330 #ifdef DIAGNOSTIC 1331 reg = 1332 #else 1333 (void) 1334 #endif 1335 bus_space_read_1(iot, ioh, plcom_dr); 1336 #ifdef DIAGNOSTIC 1337 if (!timo) 1338 printf("%s: plcom_iflush timeout %02x\n", sc->sc_dev.dv_xname, 1339 reg); 1340 #endif 1341 } 1342 1343 void 1344 plcom_loadchannelregs(struct plcom_softc *sc) 1345 { 1346 bus_space_tag_t iot = sc->sc_iot; 1347 bus_space_handle_t ioh = sc->sc_ioh; 1348 1349 /* XXXXX necessary? */ 1350 plcom_iflush(sc); 1351 1352 bus_space_write_1(iot, ioh, plcom_cr, 0); 1353 1354 bus_space_write_1(iot, ioh, plcom_dlbl, sc->sc_dlbl); 1355 bus_space_write_1(iot, ioh, plcom_dlbh, sc->sc_dlbh); 1356 bus_space_write_1(iot, ioh, plcom_lcr, sc->sc_lcr); 1357 /* XXX device_unit() abuse */ 1358 sc->sc_set_mcr(sc->sc_set_mcr_arg, device_unit(&sc->sc_dev), 1359 sc->sc_mcr_active = sc->sc_mcr); 1360 1361 bus_space_write_1(iot, ioh, plcom_cr, sc->sc_cr); 1362 } 1363 1364 int 1365 plcomhwiflow(struct tty *tp, int block) 1366 { 1367 struct plcom_softc *sc = 1368 device_lookup_private(&plcom_cd, PLCOMUNIT(tp->t_dev)); 1369 int s; 1370 1371 if (PLCOM_ISALIVE(sc) == 0) 1372 return 0; 1373 1374 if (sc->sc_mcr_rts == 0) 1375 return 0; 1376 1377 s = splserial(); 1378 PLCOM_LOCK(sc); 1379 1380 if (block) { 1381 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1382 SET(sc->sc_rx_flags, RX_TTY_BLOCKED); 1383 plcom_hwiflow(sc); 1384 } 1385 } else { 1386 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1387 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1388 plcom_schedrx(sc); 1389 } 1390 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1391 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED); 1392 plcom_hwiflow(sc); 1393 } 1394 } 1395 1396 PLCOM_UNLOCK(sc); 1397 splx(s); 1398 return 1; 1399 } 1400 1401 /* 1402 * (un)block input via hw flowcontrol 1403 */ 1404 void 1405 plcom_hwiflow(struct plcom_softc *sc) 1406 { 1407 if (sc->sc_mcr_rts == 0) 1408 return; 1409 1410 if (ISSET(sc->sc_rx_flags, RX_ANY_BLOCK)) { 1411 CLR(sc->sc_mcr, sc->sc_mcr_rts); 1412 CLR(sc->sc_mcr_active, sc->sc_mcr_rts); 1413 } else { 1414 SET(sc->sc_mcr, sc->sc_mcr_rts); 1415 SET(sc->sc_mcr_active, sc->sc_mcr_rts); 1416 } 1417 /* XXX device_unit() abuse */ 1418 sc->sc_set_mcr(sc->sc_set_mcr_arg, device_unit(&sc->sc_dev), 1419 sc->sc_mcr_active); 1420 } 1421 1422 1423 void 1424 plcomstart(struct tty *tp) 1425 { 1426 struct plcom_softc *sc = 1427 device_lookup_private(&plcom_cd, PLCOMUNIT(tp->t_dev)); 1428 bus_space_tag_t iot = sc->sc_iot; 1429 bus_space_handle_t ioh = sc->sc_ioh; 1430 int s; 1431 1432 if (PLCOM_ISALIVE(sc) == 0) 1433 return; 1434 1435 s = spltty(); 1436 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 1437 goto out; 1438 if (sc->sc_tx_stopped) 1439 goto out; 1440 1441 if (!ttypull(tp)) 1442 goto out; 1443 1444 /* Grab the first contiguous region of buffer space. */ 1445 { 1446 u_char *tba; 1447 int tbc; 1448 1449 tba = tp->t_outq.c_cf; 1450 tbc = ndqb(&tp->t_outq, 0); 1451 1452 (void)splserial(); 1453 PLCOM_LOCK(sc); 1454 1455 sc->sc_tba = tba; 1456 sc->sc_tbc = tbc; 1457 } 1458 1459 SET(tp->t_state, TS_BUSY); 1460 sc->sc_tx_busy = 1; 1461 1462 /* Enable transmit completion interrupts if necessary. */ 1463 if (!ISSET(sc->sc_cr, CR_TIE)) { 1464 SET(sc->sc_cr, CR_TIE); 1465 bus_space_write_1(iot, ioh, plcom_cr, sc->sc_cr); 1466 } 1467 1468 /* Output the first chunk of the contiguous buffer. */ 1469 { 1470 int n; 1471 1472 n = sc->sc_tbc; 1473 if (n > sc->sc_fifolen) 1474 n = sc->sc_fifolen; 1475 bus_space_write_multi_1(iot, ioh, plcom_dr, sc->sc_tba, n); 1476 sc->sc_tbc -= n; 1477 sc->sc_tba += n; 1478 } 1479 PLCOM_UNLOCK(sc); 1480 out: 1481 splx(s); 1482 return; 1483 } 1484 1485 /* 1486 * Stop output on a line. 1487 */ 1488 void 1489 plcomstop(struct tty *tp, int flag) 1490 { 1491 struct plcom_softc *sc = 1492 device_lookup_private(&plcom_cd, PLCOMUNIT(tp->t_dev)); 1493 int s; 1494 1495 s = splserial(); 1496 PLCOM_LOCK(sc); 1497 if (ISSET(tp->t_state, TS_BUSY)) { 1498 /* Stop transmitting at the next chunk. */ 1499 sc->sc_tbc = 0; 1500 sc->sc_heldtbc = 0; 1501 if (!ISSET(tp->t_state, TS_TTSTOP)) 1502 SET(tp->t_state, TS_FLUSH); 1503 } 1504 PLCOM_UNLOCK(sc); 1505 splx(s); 1506 } 1507 1508 void 1509 plcomdiag(void *arg) 1510 { 1511 struct plcom_softc *sc = arg; 1512 int overflows, floods; 1513 int s; 1514 1515 s = splserial(); 1516 PLCOM_LOCK(sc); 1517 overflows = sc->sc_overflows; 1518 sc->sc_overflows = 0; 1519 floods = sc->sc_floods; 1520 sc->sc_floods = 0; 1521 sc->sc_errors = 0; 1522 PLCOM_UNLOCK(sc); 1523 splx(s); 1524 1525 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1526 sc->sc_dev.dv_xname, 1527 overflows, overflows == 1 ? "" : "s", 1528 floods, floods == 1 ? "" : "s"); 1529 } 1530 1531 integrate void 1532 plcom_rxsoft(struct plcom_softc *sc, struct tty *tp) 1533 { 1534 int (*rint) (int, struct tty *) = tp->t_linesw->l_rint; 1535 u_char *get, *end; 1536 u_int cc, scc; 1537 u_char rsr; 1538 int code; 1539 int s; 1540 1541 end = sc->sc_ebuf; 1542 get = sc->sc_rbget; 1543 scc = cc = plcom_rbuf_size - sc->sc_rbavail; 1544 1545 if (cc == plcom_rbuf_size) { 1546 sc->sc_floods++; 1547 if (sc->sc_errors++ == 0) 1548 callout_reset(&sc->sc_diag_callout, 60 * hz, 1549 plcomdiag, sc); 1550 } 1551 1552 while (cc) { 1553 code = get[0]; 1554 rsr = get[1]; 1555 if (ISSET(rsr, RSR_OE | RSR_BE | RSR_FE | RSR_PE)) { 1556 if (ISSET(rsr, RSR_OE)) { 1557 sc->sc_overflows++; 1558 if (sc->sc_errors++ == 0) 1559 callout_reset(&sc->sc_diag_callout, 1560 60 * hz, plcomdiag, sc); 1561 } 1562 if (ISSET(rsr, RSR_BE | RSR_FE)) 1563 SET(code, TTY_FE); 1564 if (ISSET(rsr, RSR_PE)) 1565 SET(code, TTY_PE); 1566 } 1567 if ((*rint)(code, tp) == -1) { 1568 /* 1569 * The line discipline's buffer is out of space. 1570 */ 1571 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1572 /* 1573 * We're either not using flow control, or the 1574 * line discipline didn't tell us to block for 1575 * some reason. Either way, we have no way to 1576 * know when there's more space available, so 1577 * just drop the rest of the data. 1578 */ 1579 get += cc << 1; 1580 if (get >= end) 1581 get -= plcom_rbuf_size << 1; 1582 cc = 0; 1583 } else { 1584 /* 1585 * Don't schedule any more receive processing 1586 * until the line discipline tells us there's 1587 * space available (through plcomhwiflow()). 1588 * Leave the rest of the data in the input 1589 * buffer. 1590 */ 1591 SET(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1592 } 1593 break; 1594 } 1595 get += 2; 1596 if (get >= end) 1597 get = sc->sc_rbuf; 1598 cc--; 1599 } 1600 1601 if (cc != scc) { 1602 sc->sc_rbget = get; 1603 s = splserial(); 1604 PLCOM_LOCK(sc); 1605 1606 cc = sc->sc_rbavail += scc - cc; 1607 /* Buffers should be ok again, release possible block. */ 1608 if (cc >= sc->sc_r_lowat) { 1609 if (ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1610 CLR(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1611 SET(sc->sc_cr, CR_RIE | CR_RTIE); 1612 bus_space_write_1(sc->sc_iot, sc->sc_ioh, plcom_cr, sc->sc_cr); 1613 } 1614 if (ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED)) { 1615 CLR(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1616 plcom_hwiflow(sc); 1617 } 1618 } 1619 PLCOM_UNLOCK(sc); 1620 splx(s); 1621 } 1622 } 1623 1624 integrate void 1625 plcom_txsoft(struct plcom_softc *sc, struct tty *tp) 1626 { 1627 1628 CLR(tp->t_state, TS_BUSY); 1629 if (ISSET(tp->t_state, TS_FLUSH)) 1630 CLR(tp->t_state, TS_FLUSH); 1631 else 1632 ndflush(&tp->t_outq, (int)(sc->sc_tba - tp->t_outq.c_cf)); 1633 (*tp->t_linesw->l_start)(tp); 1634 } 1635 1636 integrate void 1637 plcom_stsoft(struct plcom_softc *sc, struct tty *tp) 1638 { 1639 u_char msr, delta; 1640 int s; 1641 1642 s = splserial(); 1643 PLCOM_LOCK(sc); 1644 msr = sc->sc_msr; 1645 delta = sc->sc_msr_delta; 1646 sc->sc_msr_delta = 0; 1647 PLCOM_UNLOCK(sc); 1648 splx(s); 1649 1650 if (ISSET(delta, sc->sc_msr_dcd)) { 1651 /* 1652 * Inform the tty layer that carrier detect changed. 1653 */ 1654 (void) (*tp->t_linesw->l_modem)(tp, ISSET(msr, MSR_DCD)); 1655 } 1656 1657 if (ISSET(delta, sc->sc_msr_cts)) { 1658 /* Block or unblock output according to flow control. */ 1659 if (ISSET(msr, sc->sc_msr_cts)) { 1660 sc->sc_tx_stopped = 0; 1661 (*tp->t_linesw->l_start)(tp); 1662 } else { 1663 sc->sc_tx_stopped = 1; 1664 } 1665 } 1666 1667 #ifdef PLCOM_DEBUG 1668 if (plcom_debug) 1669 plcomstatus(sc, "plcom_stsoft"); 1670 #endif 1671 } 1672 1673 void 1674 plcomsoft(void *arg) 1675 { 1676 struct plcom_softc *sc = arg; 1677 struct tty *tp; 1678 1679 if (PLCOM_ISALIVE(sc) == 0) 1680 return; 1681 1682 tp = sc->sc_tty; 1683 1684 if (sc->sc_rx_ready) { 1685 sc->sc_rx_ready = 0; 1686 plcom_rxsoft(sc, tp); 1687 } 1688 1689 if (sc->sc_st_check) { 1690 sc->sc_st_check = 0; 1691 plcom_stsoft(sc, tp); 1692 } 1693 1694 if (sc->sc_tx_done) { 1695 sc->sc_tx_done = 0; 1696 plcom_txsoft(sc, tp); 1697 } 1698 } 1699 1700 int 1701 plcomintr(void *arg) 1702 { 1703 struct plcom_softc *sc = arg; 1704 bus_space_tag_t iot = sc->sc_iot; 1705 bus_space_handle_t ioh = sc->sc_ioh; 1706 u_char *put, *end; 1707 u_int cc; 1708 u_char rsr, iir; 1709 1710 if (PLCOM_ISALIVE(sc) == 0) 1711 return 0; 1712 1713 PLCOM_LOCK(sc); 1714 iir = bus_space_read_1(iot, ioh, plcom_iir); 1715 if (! ISSET(iir, IIR_IMASK)) { 1716 PLCOM_UNLOCK(sc); 1717 return 0; 1718 } 1719 1720 end = sc->sc_ebuf; 1721 put = sc->sc_rbput; 1722 cc = sc->sc_rbavail; 1723 1724 do { 1725 u_char msr, delta, fr; 1726 1727 fr = bus_space_read_1(iot, ioh, plcom_fr); 1728 1729 if (!ISSET(fr, FR_RXFE) && 1730 !ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1731 while (cc > 0) { 1732 int cn_trapped = 0; 1733 put[0] = bus_space_read_1(iot, ioh, 1734 plcom_dr); 1735 rsr = bus_space_read_1(iot, ioh, plcom_rsr); 1736 /* Clear any error status. */ 1737 if (ISSET(rsr, 1738 (RSR_BE | RSR_OE | RSR_PE | RSR_FE))) 1739 bus_space_write_1(iot, ioh, plcom_ecr, 1740 0); 1741 if (ISSET(rsr, RSR_BE)) { 1742 cn_trapped = 0; 1743 cn_check_magic(sc->sc_tty->t_dev, 1744 CNC_BREAK, plcom_cnm_state); 1745 if (cn_trapped) 1746 continue; 1747 #if defined(KGDB) 1748 if (ISSET(sc->sc_hwflags, 1749 PLCOM_HW_KGDB)) { 1750 kgdb_connect(1); 1751 continue; 1752 } 1753 #endif 1754 } 1755 1756 put[1] = rsr; 1757 cn_trapped = 0; 1758 cn_check_magic(sc->sc_tty->t_dev, 1759 put[0], plcom_cnm_state); 1760 if (cn_trapped) { 1761 fr = bus_space_read_1(iot, ioh, 1762 plcom_fr); 1763 if (ISSET(fr, FR_RXFE)) 1764 break; 1765 1766 continue; 1767 } 1768 put += 2; 1769 if (put >= end) 1770 put = sc->sc_rbuf; 1771 cc--; 1772 1773 fr = bus_space_read_1(iot, ioh, plcom_fr); 1774 if (ISSET(fr, FR_RXFE)) 1775 break; 1776 } 1777 1778 /* 1779 * Current string of incoming characters ended because 1780 * no more data was available or we ran out of space. 1781 * Schedule a receive event if any data was received. 1782 * If we're out of space, turn off receive interrupts. 1783 */ 1784 sc->sc_rbput = put; 1785 sc->sc_rbavail = cc; 1786 if (!ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) 1787 sc->sc_rx_ready = 1; 1788 1789 /* 1790 * See if we are in danger of overflowing a buffer. If 1791 * so, use hardware flow control to ease the pressure. 1792 */ 1793 if (!ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED) && 1794 cc < sc->sc_r_hiwat) { 1795 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1796 plcom_hwiflow(sc); 1797 } 1798 1799 /* 1800 * If we're out of space, disable receive interrupts 1801 * until the queue has drained a bit. 1802 */ 1803 if (!cc) { 1804 SET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1805 CLR(sc->sc_cr, CR_RIE | CR_RTIE); 1806 bus_space_write_1(iot, ioh, plcom_cr, 1807 sc->sc_cr); 1808 } 1809 } else { 1810 if (ISSET(iir, IIR_RIS)) { 1811 bus_space_write_1(iot, ioh, plcom_cr, 0); 1812 delay(10); 1813 bus_space_write_1(iot, ioh, plcom_cr, 1814 sc->sc_cr); 1815 continue; 1816 } 1817 } 1818 1819 msr = bus_space_read_1(iot, ioh, plcom_fr); 1820 delta = msr ^ sc->sc_msr; 1821 sc->sc_msr = msr; 1822 /* Clear any pending modem status interrupt. */ 1823 if (iir & IIR_MIS) 1824 bus_space_write_1(iot, ioh, plcom_icr, 0); 1825 /* 1826 * Pulse-per-second (PSS) signals on edge of DCD? 1827 * Process these even if line discipline is ignoring DCD. 1828 */ 1829 if (delta & sc->sc_ppsmask) { 1830 struct timeval tv; 1831 mutex_spin_enter(&timecounter_lock); 1832 if ((msr & sc->sc_ppsmask) == sc->sc_ppsassert) { 1833 /* XXX nanotime() */ 1834 microtime(&tv); 1835 TIMEVAL_TO_TIMESPEC(&tv, 1836 &sc->ppsinfo.assert_timestamp); 1837 if (sc->ppsparam.mode & PPS_OFFSETASSERT) { 1838 timespecadd(&sc->ppsinfo.assert_timestamp, 1839 &sc->ppsparam.assert_offset, 1840 &sc->ppsinfo.assert_timestamp); 1841 } 1842 1843 #ifdef PPS_SYNC 1844 if (sc->ppsparam.mode & PPS_HARDPPSONASSERT) 1845 hardpps(&tv, tv.tv_usec); 1846 #endif 1847 sc->ppsinfo.assert_sequence++; 1848 sc->ppsinfo.current_mode = sc->ppsparam.mode; 1849 1850 } else if ((msr & sc->sc_ppsmask) == sc->sc_ppsclear) { 1851 /* XXX nanotime() */ 1852 microtime(&tv); 1853 TIMEVAL_TO_TIMESPEC(&tv, 1854 &sc->ppsinfo.clear_timestamp); 1855 if (sc->ppsparam.mode & PPS_OFFSETCLEAR) { 1856 timespecadd(&sc->ppsinfo.clear_timestamp, 1857 &sc->ppsparam.clear_offset, 1858 &sc->ppsinfo.clear_timestamp); 1859 } 1860 1861 #ifdef PPS_SYNC 1862 if (sc->ppsparam.mode & PPS_HARDPPSONCLEAR) 1863 hardpps(&tv, tv.tv_usec); 1864 #endif 1865 sc->ppsinfo.clear_sequence++; 1866 sc->ppsinfo.current_mode = sc->ppsparam.mode; 1867 } 1868 mutex_spin_exit(&timecounter_lock); 1869 } 1870 1871 /* 1872 * Process normal status changes 1873 */ 1874 if (ISSET(delta, sc->sc_msr_mask)) { 1875 SET(sc->sc_msr_delta, delta); 1876 1877 /* 1878 * Stop output immediately if we lose the output 1879 * flow control signal or carrier detect. 1880 */ 1881 if (ISSET(~msr, sc->sc_msr_mask)) { 1882 sc->sc_tbc = 0; 1883 sc->sc_heldtbc = 0; 1884 #ifdef PLCOM_DEBUG 1885 if (plcom_debug) 1886 plcomstatus(sc, "plcomintr "); 1887 #endif 1888 } 1889 1890 sc->sc_st_check = 1; 1891 } 1892 1893 /* 1894 * Done handling any receive interrupts. See if data 1895 * can be * transmitted as well. Schedule tx done 1896 * event if no data left * and tty was marked busy. 1897 */ 1898 if (ISSET(iir, IIR_TIS)) { 1899 /* 1900 * If we've delayed a parameter change, do it 1901 * now, and restart * output. 1902 */ 1903 if (sc->sc_heldchange) { 1904 plcom_loadchannelregs(sc); 1905 sc->sc_heldchange = 0; 1906 sc->sc_tbc = sc->sc_heldtbc; 1907 sc->sc_heldtbc = 0; 1908 } 1909 1910 /* 1911 * Output the next chunk of the contiguous 1912 * buffer, if any. 1913 */ 1914 if (sc->sc_tbc > 0) { 1915 int n; 1916 1917 n = sc->sc_tbc; 1918 if (n > sc->sc_fifolen) 1919 n = sc->sc_fifolen; 1920 bus_space_write_multi_1(iot, ioh, plcom_dr, 1921 sc->sc_tba, n); 1922 sc->sc_tbc -= n; 1923 sc->sc_tba += n; 1924 } else { 1925 /* 1926 * Disable transmit plcompletion 1927 * interrupts if necessary. 1928 */ 1929 if (ISSET(sc->sc_cr, CR_TIE)) { 1930 CLR(sc->sc_cr, CR_TIE); 1931 bus_space_write_1(iot, ioh, plcom_cr, 1932 sc->sc_cr); 1933 } 1934 if (sc->sc_tx_busy) { 1935 sc->sc_tx_busy = 0; 1936 sc->sc_tx_done = 1; 1937 } 1938 } 1939 } 1940 } while (ISSET((iir = bus_space_read_1(iot, ioh, plcom_iir)), 1941 IIR_IMASK)); 1942 1943 PLCOM_UNLOCK(sc); 1944 1945 /* Wake up the poller. */ 1946 softint_schedule(sc->sc_si); 1947 1948 #if NRND > 0 && defined(RND_COM) 1949 rnd_add_uint32(&sc->rnd_source, iir | rsr); 1950 #endif 1951 1952 return 1; 1953 } 1954 1955 /* 1956 * The following functions are polled getc and putc routines, shared 1957 * by the console and kgdb glue. 1958 * 1959 * The read-ahead code is so that you can detect pending in-band 1960 * cn_magic in polled mode while doing output rather than having to 1961 * wait until the kernel decides it needs input. 1962 */ 1963 1964 #define MAX_READAHEAD 20 1965 static int plcom_readahead[MAX_READAHEAD]; 1966 static int plcom_readaheadcount = 0; 1967 1968 int 1969 plcom_common_getc(dev_t dev, bus_space_tag_t iot, bus_space_handle_t ioh) 1970 { 1971 int s = splserial(); 1972 u_char stat, c; 1973 1974 /* got a character from reading things earlier */ 1975 if (plcom_readaheadcount > 0) { 1976 int i; 1977 1978 c = plcom_readahead[0]; 1979 for (i = 1; i < plcom_readaheadcount; i++) { 1980 plcom_readahead[i-1] = plcom_readahead[i]; 1981 } 1982 plcom_readaheadcount--; 1983 splx(s); 1984 return c; 1985 } 1986 1987 /* block until a character becomes available */ 1988 while (ISSET(stat = bus_space_read_1(iot, ioh, plcom_fr), FR_RXFE)) 1989 ; 1990 1991 c = bus_space_read_1(iot, ioh, plcom_dr); 1992 stat = bus_space_read_1(iot, ioh, plcom_iir); 1993 { 1994 int cn_trapped = 0; /* unused */ 1995 #ifdef DDB 1996 extern int db_active; 1997 if (!db_active) 1998 #endif 1999 cn_check_magic(dev, c, plcom_cnm_state); 2000 } 2001 splx(s); 2002 return c; 2003 } 2004 2005 void 2006 plcom_common_putc(dev_t dev, bus_space_tag_t iot, bus_space_handle_t ioh, 2007 int c) 2008 { 2009 int s = splserial(); 2010 int timo; 2011 2012 int cin, stat; 2013 if (plcom_readaheadcount < MAX_READAHEAD 2014 && !ISSET(stat = bus_space_read_1(iot, ioh, plcom_fr), FR_RXFE)) { 2015 int cn_trapped = 0; 2016 cin = bus_space_read_1(iot, ioh, plcom_dr); 2017 stat = bus_space_read_1(iot, ioh, plcom_iir); 2018 cn_check_magic(dev, cin, plcom_cnm_state); 2019 plcom_readahead[plcom_readaheadcount++] = cin; 2020 } 2021 2022 /* wait for any pending transmission to finish */ 2023 timo = 150000; 2024 while (!ISSET(bus_space_read_1(iot, ioh, plcom_fr), FR_TXFE) && --timo) 2025 continue; 2026 2027 bus_space_write_1(iot, ioh, plcom_dr, c); 2028 PLCOM_BARRIER(iot, ioh, BR | BW); 2029 2030 /* wait for this transmission to complete */ 2031 timo = 1500000; 2032 while (!ISSET(bus_space_read_1(iot, ioh, plcom_fr), FR_TXFE) && --timo) 2033 continue; 2034 2035 splx(s); 2036 } 2037 2038 /* 2039 * Initialize UART for use as console or KGDB line. 2040 */ 2041 int 2042 plcominit(bus_space_tag_t iot, bus_addr_t iobase, int rate, int frequency, 2043 tcflag_t cflag, bus_space_handle_t *iohp) 2044 { 2045 bus_space_handle_t ioh; 2046 2047 if (bus_space_map(iot, iobase, PLCOM_UART_SIZE, 0, &ioh)) 2048 return ENOMEM; /* ??? */ 2049 2050 rate = plcomspeed(rate, frequency); 2051 bus_space_write_1(iot, ioh, plcom_cr, 0); 2052 bus_space_write_1(iot, ioh, plcom_dlbl, rate); 2053 bus_space_write_1(iot, ioh, plcom_dlbh, rate >> 8); 2054 bus_space_write_1(iot, ioh, plcom_lcr, cflag2lcr(cflag) | LCR_FEN); 2055 bus_space_write_1(iot, ioh, plcom_cr, CR_UARTEN); 2056 2057 #if 0 2058 /* Ought to do something like this, but we have no sc to 2059 dereference. */ 2060 /* XXX device_unit() abuse */ 2061 sc->sc_set_mcr(sc->sc_set_mcr_arg, device_unit(&sc->sc_dev), 2062 MCR_DTR | MCR_RTS); 2063 #endif 2064 2065 *iohp = ioh; 2066 return 0; 2067 } 2068 2069 /* 2070 * Following are all routines needed for PLCOM to act as console 2071 */ 2072 struct consdev plcomcons = { 2073 NULL, NULL, plcomcngetc, plcomcnputc, plcomcnpollc, NULL, 2074 NULL, NULL, NODEV, CN_NORMAL 2075 }; 2076 2077 2078 int 2079 plcomcnattach(bus_space_tag_t iot, bus_addr_t iobase, int rate, int frequency, 2080 tcflag_t cflag, int unit) 2081 { 2082 int res; 2083 2084 res = plcominit(iot, iobase, rate, frequency, cflag, &plcomconsioh); 2085 if (res) 2086 return res; 2087 2088 cn_tab = &plcomcons; 2089 cn_init_magic(&plcom_cnm_state); 2090 cn_set_magic("\047\001"); /* default magic is BREAK */ 2091 2092 plcomconstag = iot; 2093 plcomconsunit = unit; 2094 plcomconsrate = rate; 2095 plcomconscflag = cflag; 2096 2097 return 0; 2098 } 2099 2100 void 2101 plcomcndetach(void) 2102 { 2103 bus_space_unmap(plcomconstag, plcomconsioh, PLCOM_UART_SIZE); 2104 plcomconstag = NULL; 2105 2106 cn_tab = NULL; 2107 } 2108 2109 int 2110 plcomcngetc(dev_t dev) 2111 { 2112 return plcom_common_getc(dev, plcomconstag, plcomconsioh); 2113 } 2114 2115 /* 2116 * Console kernel output character routine. 2117 */ 2118 void 2119 plcomcnputc(dev_t dev, int c) 2120 { 2121 plcom_common_putc(dev, plcomconstag, plcomconsioh, c); 2122 } 2123 2124 void 2125 plcomcnpollc(dev_t dev, int on) 2126 { 2127 2128 } 2129 2130 #ifdef KGDB 2131 int 2132 plcom_kgdb_attach(bus_space_tag_t iot, bus_addr_t iobase, int rate, 2133 int frequency, tcflag_t cflag, int unit) 2134 { 2135 int res; 2136 2137 if (iot == plcomconstag && iobase == plcomconsunit) 2138 return EBUSY; /* cannot share with console */ 2139 2140 res = plcominit(iot, iobase, rate, frequency, cflag, &plcom_kgdb_ioh); 2141 if (res) 2142 return res; 2143 2144 kgdb_attach(plcom_kgdb_getc, plcom_kgdb_putc, NULL); 2145 kgdb_dev = 123; /* unneeded, only to satisfy some tests */ 2146 2147 plcom_kgdb_iot = iot; 2148 plcom_kgdb_unit = unit; 2149 2150 return 0; 2151 } 2152 2153 /* ARGSUSED */ 2154 int 2155 plcom_kgdb_getc(void *arg) 2156 { 2157 return plcom_common_getc(NODEV, plcom_kgdb_iot, plcom_kgdb_ioh); 2158 } 2159 2160 /* ARGSUSED */ 2161 void 2162 plcom_kgdb_putc(void *arg, int c) 2163 { 2164 plcom_common_putc(NODEV, plcom_kgdb_iot, plcom_kgdb_ioh, c); 2165 } 2166 #endif /* KGDB */ 2167 2168 /* helper function to identify the plcom ports used by 2169 console or KGDB (and not yet autoconf attached) */ 2170 int 2171 plcom_is_console(bus_space_tag_t iot, int unit, 2172 bus_space_handle_t *ioh) 2173 { 2174 bus_space_handle_t help; 2175 2176 if (!plcomconsattached && 2177 iot == plcomconstag && unit == plcomconsunit) 2178 help = plcomconsioh; 2179 #ifdef KGDB 2180 else if (!plcom_kgdb_attached && 2181 iot == plcom_kgdb_iot && unit == plcom_kgdb_unit) 2182 help = plcom_kgdb_ioh; 2183 #endif 2184 else 2185 return 0; 2186 2187 if (ioh) 2188 *ioh = help; 2189 return 1; 2190 } 2191
Indexes created Sat Oct 18 23:09:54 GMT 2025