plcom.c revision 1.24.6.1
1 /* $NetBSD: plcom.c,v 1.24.6.1 2008/01/08 22:09:40 bouyer 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 * 3. All advertising materials mentioning features or use of this software 46 * must display the following acknowledgement: 47 * This product includes software developed by the NetBSD 48 * Foundation, Inc. and its contributors. 49 * 4. Neither the name of The NetBSD Foundation nor the names of its 50 * contributors may be used to endorse or promote products derived 51 * from this software without specific prior written permission. 52 * 53 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 54 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 55 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 56 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 57 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 58 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 59 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 60 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 61 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 62 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 63 * POSSIBILITY OF SUCH DAMAGE. 64 */ 65 66 /* 67 * Copyright (c) 1991 The Regents of the University of California. 68 * All rights reserved. 69 * 70 * Redistribution and use in source and binary forms, with or without 71 * modification, are permitted provided that the following conditions 72 * are met: 73 * 1. Redistributions of source code must retain the above copyright 74 * notice, this list of conditions and the following disclaimer. 75 * 2. Redistributions in binary form must reproduce the above copyright 76 * notice, this list of conditions and the following disclaimer in the 77 * documentation and/or other materials provided with the distribution. 78 * 3. Neither the name of the University nor the names of its contributors 79 * may be used to endorse or promote products derived from this software 80 * without specific prior written permission. 81 * 82 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 83 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 84 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 85 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 86 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 87 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 88 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 89 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 90 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 91 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 92 * SUCH DAMAGE. 93 * 94 * @(#)com.c 7.5 (Berkeley) 5/16/91 95 */ 96 97 /* 98 * COM driver for the Prime Cell PL010 UART, which is similar to the 16C550, 99 * but has a completely different programmer's model. 100 * Derived from the NS16550AF com driver. 101 */ 102 103 #include <sys/cdefs.h> 104 __KERNEL_RCSID(0, "$NetBSD: plcom.c,v 1.24.6.1 2008/01/08 22:09:40 bouyer Exp $"); 105 106 #include "opt_plcom.h" 107 #include "opt_ddb.h" 108 #include "opt_kgdb.h" 109 #include "opt_lockdebug.h" 110 #include "opt_multiprocessor.h" 111 112 #include "rnd.h" 113 #if NRND > 0 && defined(RND_COM) 114 #include <sys/rnd.h> 115 #endif 116 117 /* 118 * Override cnmagic(9) macro before including <sys/systm.h>. 119 * We need to know if cn_check_magic triggered debugger, so set a flag. 120 * Callers of cn_check_magic must declare int cn_trapped = 0; 121 * XXX: this is *ugly*! 122 */ 123 #define cn_trap() \ 124 do { \ 125 console_debugger(); \ 126 cn_trapped = 1; \ 127 } while (/* CONSTCOND */ 0) 128 129 #include <sys/param.h> 130 #include <sys/systm.h> 131 #include <sys/ioctl.h> 132 #include <sys/select.h> 133 #include <sys/tty.h> 134 #include <sys/proc.h> 135 #include <sys/user.h> 136 #include <sys/conf.h> 137 #include <sys/file.h> 138 #include <sys/uio.h> 139 #include <sys/kernel.h> 140 #include <sys/syslog.h> 141 #include <sys/types.h> 142 #include <sys/device.h> 143 #include <sys/malloc.h> 144 #include <sys/timepps.h> 145 #include <sys/vnode.h> 146 #include <sys/kauth.h> 147 #include <sys/intr.h> 148 #include <sys/bus.h> 149 150 #include <evbarm/dev/plcomreg.h> 151 #include <evbarm/dev/plcomvar.h> 152 153 #include <dev/cons.h> 154 155 static void plcom_enable_debugport (struct plcom_softc *); 156 157 void plcom_config (struct plcom_softc *); 158 void plcom_shutdown (struct plcom_softc *); 159 int plcomspeed (long, long); 160 static u_char cflag2lcr (tcflag_t); 161 int plcomparam (struct tty *, struct termios *); 162 void plcomstart (struct tty *); 163 int plcomhwiflow (struct tty *, int); 164 165 void plcom_loadchannelregs (struct plcom_softc *); 166 void plcom_hwiflow (struct plcom_softc *); 167 void plcom_break (struct plcom_softc *, int); 168 void plcom_modem (struct plcom_softc *, int); 169 void tiocm_to_plcom (struct plcom_softc *, u_long, int); 170 int plcom_to_tiocm (struct plcom_softc *); 171 void plcom_iflush (struct plcom_softc *); 172 173 int plcom_common_getc (dev_t, bus_space_tag_t, bus_space_handle_t); 174 void plcom_common_putc (dev_t, bus_space_tag_t, bus_space_handle_t, int); 175 176 int plcominit (bus_space_tag_t, bus_addr_t, int, int, tcflag_t, 177 bus_space_handle_t *); 178 179 dev_type_open(plcomopen); 180 dev_type_close(plcomclose); 181 dev_type_read(plcomread); 182 dev_type_write(plcomwrite); 183 dev_type_ioctl(plcomioctl); 184 dev_type_stop(plcomstop); 185 dev_type_tty(plcomtty); 186 dev_type_poll(plcompoll); 187 188 int plcomcngetc (dev_t); 189 void plcomcnputc (dev_t, int); 190 void plcomcnpollc (dev_t, int); 191 192 #define integrate static inline 193 void plcomsoft (void *); 194 integrate void plcom_rxsoft (struct plcom_softc *, struct tty *); 195 integrate void plcom_txsoft (struct plcom_softc *, struct tty *); 196 integrate void plcom_stsoft (struct plcom_softc *, struct tty *); 197 integrate void plcom_schedrx (struct plcom_softc *); 198 void plcomdiag (void *); 199 200 extern struct cfdriver plcom_cd; 201 202 const struct cdevsw plcom_cdevsw = { 203 plcomopen, plcomclose, plcomread, plcomwrite, plcomioctl, 204 plcomstop, plcomtty, plcompoll, nommap, ttykqfilter, D_TTY 205 }; 206 207 /* 208 * Make this an option variable one can patch. 209 * But be warned: this must be a power of 2! 210 */ 211 u_int plcom_rbuf_size = PLCOM_RING_SIZE; 212 213 /* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */ 214 u_int plcom_rbuf_hiwat = (PLCOM_RING_SIZE * 1) / 4; 215 u_int plcom_rbuf_lowat = (PLCOM_RING_SIZE * 3) / 4; 216 217 static int plcomconsunit = -1; 218 static bus_space_tag_t plcomconstag; 219 static bus_space_handle_t plcomconsioh; 220 static int plcomconsattached; 221 static int plcomconsrate; 222 static tcflag_t plcomconscflag; 223 static struct cnm_state plcom_cnm_state; 224 225 static int ppscap = 226 PPS_TSFMT_TSPEC | 227 PPS_CAPTUREASSERT | 228 PPS_CAPTURECLEAR | 229 #ifdef PPS_SYNC 230 PPS_HARDPPSONASSERT | PPS_HARDPPSONCLEAR | 231 #endif /* PPS_SYNC */ 232 PPS_OFFSETASSERT | PPS_OFFSETCLEAR; 233 234 #ifdef KGDB 235 #include <sys/kgdb.h> 236 237 static int plcom_kgdb_unit; 238 static bus_space_tag_t plcom_kgdb_iot; 239 static bus_space_handle_t plcom_kgdb_ioh; 240 static int plcom_kgdb_attached; 241 242 int plcom_kgdb_getc (void *); 243 void plcom_kgdb_putc (void *, int); 244 #endif /* KGDB */ 245 246 #define PLCOMUNIT_MASK 0x7ffff 247 #define PLCOMDIALOUT_MASK 0x80000 248 249 #define PLCOMUNIT(x) (minor(x) & PLCOMUNIT_MASK) 250 #define PLCOMDIALOUT(x) (minor(x) & PLCOMDIALOUT_MASK) 251 252 #define PLCOM_ISALIVE(sc) ((sc)->enabled != 0 && \ 253 device_is_active(&(sc)->sc_dev)) 254 255 #define BR BUS_SPACE_BARRIER_READ 256 #define BW BUS_SPACE_BARRIER_WRITE 257 #define PLCOM_BARRIER(t, h, f) bus_space_barrier((t), (h), 0, PLCOM_UART_SIZE, (f)) 258 259 #define PLCOM_LOCK(sc) simple_lock(&(sc)->sc_lock) 260 #define PLCOM_UNLOCK(sc) simple_unlock(&(sc)->sc_lock) 261 262 int 263 plcomspeed(long speed, long frequency) 264 { 265 #define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */ 266 267 int x, err; 268 269 #if 0 270 if (speed == 0) 271 return 0; 272 #endif 273 if (speed <= 0) 274 return -1; 275 x = divrnd(frequency / 16, speed); 276 if (x <= 0) 277 return -1; 278 err = divrnd(((quad_t)frequency) * 1000 / 16, speed * x) - 1000; 279 if (err < 0) 280 err = -err; 281 if (err > PLCOM_TOLERANCE) 282 return -1; 283 return x; 284 285 #undef divrnd 286 } 287 288 #ifdef PLCOM_DEBUG 289 int plcom_debug = 0; 290 291 void plcomstatus (struct plcom_softc *, char *); 292 void 293 plcomstatus(struct plcom_softc *sc, char *str) 294 { 295 struct tty *tp = sc->sc_tty; 296 297 printf("%s: %s %sclocal %sdcd %sts_carr_on %sdtr %stx_stopped\n", 298 sc->sc_dev.dv_xname, str, 299 ISSET(tp->t_cflag, CLOCAL) ? "+" : "-", 300 ISSET(sc->sc_msr, MSR_DCD) ? "+" : "-", 301 ISSET(tp->t_state, TS_CARR_ON) ? "+" : "-", 302 ISSET(sc->sc_mcr, MCR_DTR) ? "+" : "-", 303 sc->sc_tx_stopped ? "+" : "-"); 304 305 printf("%s: %s %scrtscts %scts %sts_ttstop %srts %xrx_flags\n", 306 sc->sc_dev.dv_xname, str, 307 ISSET(tp->t_cflag, CRTSCTS) ? "+" : "-", 308 ISSET(sc->sc_msr, MSR_CTS) ? "+" : "-", 309 ISSET(tp->t_state, TS_TTSTOP) ? "+" : "-", 310 ISSET(sc->sc_mcr, MCR_RTS) ? "+" : "-", 311 sc->sc_rx_flags); 312 } 313 #endif 314 315 int 316 plcomprobe1(bus_space_tag_t iot, bus_space_handle_t ioh) 317 { 318 int data; 319 320 /* Disable the UART. */ 321 bus_space_write_1(iot, ioh, plcom_cr, 0); 322 /* Make sure the FIFO is off. */ 323 bus_space_write_1(iot, ioh, plcom_lcr, LCR_8BITS); 324 /* Disable interrupts. */ 325 bus_space_write_1(iot, ioh, plcom_iir, 0); 326 327 /* Make sure we swallow anything in the receiving register. */ 328 data = bus_space_read_1(iot, ioh, plcom_dr); 329 330 if (bus_space_read_1(iot, ioh, plcom_lcr) != LCR_8BITS) 331 return 0; 332 333 data = bus_space_read_1(iot, ioh, plcom_fr) & (FR_RXFF | FR_RXFE); 334 335 if (data != FR_RXFE) 336 return 0; 337 338 return 1; 339 } 340 341 static void 342 plcom_enable_debugport(struct plcom_softc *sc) 343 { 344 int s; 345 346 /* Turn on line break interrupt, set carrier. */ 347 s = splserial(); 348 PLCOM_LOCK(sc); 349 sc->sc_cr = CR_RIE | CR_RTIE | CR_UARTEN; 350 bus_space_write_1(sc->sc_iot, sc->sc_ioh, plcom_cr, sc->sc_cr); 351 SET(sc->sc_mcr, MCR_DTR | MCR_RTS); 352 /* XXX device_unit() abuse */ 353 sc->sc_set_mcr(sc->sc_set_mcr_arg, device_unit(&sc->sc_dev), 354 sc->sc_mcr); 355 PLCOM_UNLOCK(sc); 356 splx(s); 357 } 358 359 void 360 plcom_attach_subr(struct plcom_softc *sc) 361 { 362 int unit = sc->sc_iounit; 363 bus_space_tag_t iot = sc->sc_iot; 364 bus_space_handle_t ioh = sc->sc_ioh; 365 struct tty *tp; 366 367 callout_init(&sc->sc_diag_callout, 0); 368 simple_lock_init(&sc->sc_lock); 369 370 /* Disable interrupts before configuring the device. */ 371 sc->sc_cr = 0; 372 373 if (plcomconstag && unit == plcomconsunit) { 374 plcomconsattached = 1; 375 376 plcomconstag = iot; 377 plcomconsioh = ioh; 378 379 /* Make sure the console is always "hardwired". */ 380 delay(1000); /* wait for output to finish */ 381 SET(sc->sc_hwflags, PLCOM_HW_CONSOLE); 382 SET(sc->sc_swflags, TIOCFLAG_SOFTCAR); 383 /* Must re-enable the console immediately, or we will 384 hang when trying to print. */ 385 sc->sc_cr = CR_UARTEN; 386 } 387 388 bus_space_write_1(iot, ioh, plcom_cr, sc->sc_cr); 389 390 /* The PL010 has a 16-byte fifo, but the tx interrupt triggers when 391 there is space for 8 more bytes. */ 392 sc->sc_fifolen = 8; 393 printf("\n"); 394 395 if (ISSET(sc->sc_hwflags, PLCOM_HW_TXFIFO_DISABLE)) { 396 sc->sc_fifolen = 1; 397 printf("%s: txfifo disabled\n", sc->sc_dev.dv_xname); 398 } 399 400 if (sc->sc_fifolen > 1) 401 SET(sc->sc_hwflags, PLCOM_HW_FIFO); 402 403 tp = ttymalloc(); 404 tp->t_oproc = plcomstart; 405 tp->t_param = plcomparam; 406 tp->t_hwiflow = plcomhwiflow; 407 408 sc->sc_tty = tp; 409 sc->sc_rbuf = malloc(plcom_rbuf_size << 1, M_DEVBUF, M_NOWAIT); 410 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 411 sc->sc_rbavail = plcom_rbuf_size; 412 if (sc->sc_rbuf == NULL) { 413 printf("%s: unable to allocate ring buffer\n", 414 sc->sc_dev.dv_xname); 415 return; 416 } 417 sc->sc_ebuf = sc->sc_rbuf + (plcom_rbuf_size << 1); 418 419 tty_attach(tp); 420 421 if (ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE)) { 422 int maj; 423 424 /* locate the major number */ 425 maj = cdevsw_lookup_major(&plcom_cdevsw); 426 427 cn_tab->cn_dev = makedev(maj, device_unit(&sc->sc_dev)); 428 429 printf("%s: console\n", sc->sc_dev.dv_xname); 430 } 431 432 #ifdef KGDB 433 /* 434 * Allow kgdb to "take over" this port. If this is 435 * the kgdb device, it has exclusive use. 436 */ 437 if (iot == plcom_kgdb_iot && unit == plcom_kgdb_unit) { 438 plcom_kgdb_attached = 1; 439 440 SET(sc->sc_hwflags, PLCOM_HW_KGDB); 441 printf("%s: kgdb\n", sc->sc_dev.dv_xname); 442 } 443 #endif 444 445 sc->sc_si = softint_establish(SOFTINT_SERIAL, plcomsoft, sc); 446 447 #if NRND > 0 && defined(RND_COM) 448 rnd_attach_source(&sc->rnd_source, sc->sc_dev.dv_xname, 449 RND_TYPE_TTY, 0); 450 #endif 451 452 /* if there are no enable/disable functions, assume the device 453 is always enabled */ 454 if (!sc->enable) 455 sc->enabled = 1; 456 457 plcom_config(sc); 458 459 SET(sc->sc_hwflags, PLCOM_HW_DEV_OK); 460 } 461 462 void 463 plcom_config(struct plcom_softc *sc) 464 { 465 bus_space_tag_t iot = sc->sc_iot; 466 bus_space_handle_t ioh = sc->sc_ioh; 467 468 /* Disable interrupts before configuring the device. */ 469 sc->sc_cr = 0; 470 bus_space_write_1(iot, ioh, plcom_cr, sc->sc_cr); 471 472 if (ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE|PLCOM_HW_KGDB)) 473 plcom_enable_debugport(sc); 474 } 475 476 int 477 plcom_detach(self, flags) 478 struct device *self; 479 int flags; 480 { 481 struct plcom_softc *sc = (struct plcom_softc *)self; 482 int maj, mn; 483 484 /* locate the major number */ 485 maj = cdevsw_lookup_major(&plcom_cdevsw); 486 487 /* Nuke the vnodes for any open instances. */ 488 mn = device_unit(self); 489 vdevgone(maj, mn, mn, VCHR); 490 491 mn |= PLCOMDIALOUT_MASK; 492 vdevgone(maj, mn, mn, VCHR); 493 494 /* Free the receive buffer. */ 495 free(sc->sc_rbuf, M_DEVBUF); 496 497 /* Detach and free the tty. */ 498 tty_detach(sc->sc_tty); 499 ttyfree(sc->sc_tty); 500 501 /* Unhook the soft interrupt handler. */ 502 softint_disestablish(sc->sc_si); 503 504 #if NRND > 0 && defined(RND_COM) 505 /* Unhook the entropy source. */ 506 rnd_detach_source(&sc->rnd_source); 507 #endif 508 509 return 0; 510 } 511 512 int 513 plcom_activate(struct device *self, enum devact act) 514 { 515 struct plcom_softc *sc = (struct plcom_softc *)self; 516 int s, rv = 0; 517 518 s = splserial(); 519 PLCOM_LOCK(sc); 520 switch (act) { 521 case DVACT_ACTIVATE: 522 rv = EOPNOTSUPP; 523 break; 524 525 case DVACT_DEACTIVATE: 526 if (sc->sc_hwflags & (PLCOM_HW_CONSOLE|PLCOM_HW_KGDB)) { 527 rv = EBUSY; 528 break; 529 } 530 531 if (sc->disable != NULL && sc->enabled != 0) { 532 (*sc->disable)(sc); 533 sc->enabled = 0; 534 } 535 break; 536 } 537 538 PLCOM_UNLOCK(sc); 539 splx(s); 540 return rv; 541 } 542 543 void 544 plcom_shutdown(struct plcom_softc *sc) 545 { 546 struct tty *tp = sc->sc_tty; 547 int s; 548 549 s = splserial(); 550 PLCOM_LOCK(sc); 551 552 /* If we were asserting flow control, then deassert it. */ 553 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 554 plcom_hwiflow(sc); 555 556 /* Clear any break condition set with TIOCSBRK. */ 557 plcom_break(sc, 0); 558 559 /* Turn off PPS capture on last close. */ 560 sc->sc_ppsmask = 0; 561 sc->ppsparam.mode = 0; 562 563 /* 564 * Hang up if necessary. Wait a bit, so the other side has time to 565 * notice even if we immediately open the port again. 566 * Avoid tsleeping above splhigh(). 567 */ 568 if (ISSET(tp->t_cflag, HUPCL)) { 569 plcom_modem(sc, 0); 570 PLCOM_UNLOCK(sc); 571 splx(s); 572 /* XXX tsleep will only timeout */ 573 (void) tsleep(sc, TTIPRI, ttclos, hz); 574 s = splserial(); 575 PLCOM_LOCK(sc); 576 } 577 578 /* Turn off interrupts. */ 579 if (ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE)) 580 /* interrupt on break */ 581 sc->sc_cr = CR_RIE | CR_RTIE | CR_UARTEN; 582 else 583 sc->sc_cr = 0; 584 bus_space_write_1(sc->sc_iot, sc->sc_ioh, plcom_cr, sc->sc_cr); 585 586 if (sc->disable) { 587 #ifdef DIAGNOSTIC 588 if (!sc->enabled) 589 panic("plcom_shutdown: not enabled?"); 590 #endif 591 (*sc->disable)(sc); 592 sc->enabled = 0; 593 } 594 PLCOM_UNLOCK(sc); 595 splx(s); 596 } 597 598 int 599 plcomopen(dev_t dev, int flag, int mode, struct lwp *l) 600 { 601 struct plcom_softc *sc; 602 struct tty *tp; 603 int s, s2; 604 int error; 605 606 sc = device_lookup(&plcom_cd, PLCOMUNIT(dev)); 607 if (sc == NULL || !ISSET(sc->sc_hwflags, PLCOM_HW_DEV_OK) || 608 sc->sc_rbuf == NULL) 609 return ENXIO; 610 611 if (!device_is_active(&sc->sc_dev)) 612 return ENXIO; 613 614 #ifdef KGDB 615 /* 616 * If this is the kgdb port, no other use is permitted. 617 */ 618 if (ISSET(sc->sc_hwflags, PLCOM_HW_KGDB)) 619 return EBUSY; 620 #endif 621 622 tp = sc->sc_tty; 623 624 if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp)) 625 return (EBUSY); 626 627 s = spltty(); 628 629 /* 630 * Do the following iff this is a first open. 631 */ 632 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 633 struct termios t; 634 635 tp->t_dev = dev; 636 637 s2 = splserial(); 638 PLCOM_LOCK(sc); 639 640 if (sc->enable) { 641 if ((*sc->enable)(sc)) { 642 PLCOM_UNLOCK(sc); 643 splx(s2); 644 splx(s); 645 printf("%s: device enable failed\n", 646 sc->sc_dev.dv_xname); 647 return EIO; 648 } 649 sc->enabled = 1; 650 plcom_config(sc); 651 } 652 653 /* Turn on interrupts. */ 654 /* IER_ERXRDY | IER_ERLS | IER_EMSC; */ 655 sc->sc_cr = CR_RIE | CR_RTIE | CR_MSIE | CR_UARTEN; 656 bus_space_write_1(sc->sc_iot, sc->sc_ioh, plcom_cr, sc->sc_cr); 657 658 /* Fetch the current modem control status, needed later. */ 659 sc->sc_msr = bus_space_read_1(sc->sc_iot, sc->sc_ioh, plcom_fr); 660 661 /* Clear PPS capture state on first open. */ 662 sc->sc_ppsmask = 0; 663 sc->ppsparam.mode = 0; 664 665 PLCOM_UNLOCK(sc); 666 splx(s2); 667 668 /* 669 * Initialize the termios status to the defaults. Add in the 670 * sticky bits from TIOCSFLAGS. 671 */ 672 t.c_ispeed = 0; 673 if (ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE)) { 674 t.c_ospeed = plcomconsrate; 675 t.c_cflag = plcomconscflag; 676 } else { 677 t.c_ospeed = TTYDEF_SPEED; 678 t.c_cflag = TTYDEF_CFLAG; 679 } 680 if (ISSET(sc->sc_swflags, TIOCFLAG_CLOCAL)) 681 SET(t.c_cflag, CLOCAL); 682 if (ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS)) 683 SET(t.c_cflag, CRTSCTS); 684 if (ISSET(sc->sc_swflags, TIOCFLAG_MDMBUF)) 685 SET(t.c_cflag, MDMBUF); 686 /* Make sure plcomparam() will do something. */ 687 tp->t_ospeed = 0; 688 (void) plcomparam(tp, &t); 689 tp->t_iflag = TTYDEF_IFLAG; 690 tp->t_oflag = TTYDEF_OFLAG; 691 tp->t_lflag = TTYDEF_LFLAG; 692 ttychars(tp); 693 ttsetwater(tp); 694 695 s2 = splserial(); 696 PLCOM_LOCK(sc); 697 698 /* 699 * Turn on DTR. We must always do this, even if carrier is not 700 * present, because otherwise we'd have to use TIOCSDTR 701 * immediately after setting CLOCAL, which applications do not 702 * expect. We always assert DTR while the device is open 703 * unless explicitly requested to deassert it. 704 */ 705 plcom_modem(sc, 1); 706 707 /* Clear the input ring, and unblock. */ 708 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 709 sc->sc_rbavail = plcom_rbuf_size; 710 plcom_iflush(sc); 711 CLR(sc->sc_rx_flags, RX_ANY_BLOCK); 712 plcom_hwiflow(sc); 713 714 #ifdef PLCOM_DEBUG 715 if (plcom_debug) 716 plcomstatus(sc, "plcomopen "); 717 #endif 718 719 PLCOM_UNLOCK(sc); 720 splx(s2); 721 } 722 723 splx(s); 724 725 error = ttyopen(tp, PLCOMDIALOUT(dev), ISSET(flag, O_NONBLOCK)); 726 if (error) 727 goto bad; 728 729 error = (*tp->t_linesw->l_open)(dev, tp); 730 if (error) 731 goto bad; 732 733 return 0; 734 735 bad: 736 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 737 /* 738 * We failed to open the device, and nobody else had it opened. 739 * Clean up the state as appropriate. 740 */ 741 plcom_shutdown(sc); 742 } 743 744 return error; 745 } 746 747 int 748 plcomclose(dev_t dev, int flag, int mode, struct lwp *l) 749 { 750 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(dev)); 751 struct tty *tp = sc->sc_tty; 752 753 /* XXX This is for cons.c. */ 754 if (!ISSET(tp->t_state, TS_ISOPEN)) 755 return 0; 756 757 (*tp->t_linesw->l_close)(tp, flag); 758 ttyclose(tp); 759 760 if (PLCOM_ISALIVE(sc) == 0) 761 return 0; 762 763 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 764 /* 765 * Although we got a last close, the device may still be in 766 * use; e.g. if this was the dialout node, and there are still 767 * processes waiting for carrier on the non-dialout node. 768 */ 769 plcom_shutdown(sc); 770 } 771 772 return 0; 773 } 774 775 int 776 plcomread(dev_t dev, struct uio *uio, int flag) 777 { 778 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(dev)); 779 struct tty *tp = sc->sc_tty; 780 781 if (PLCOM_ISALIVE(sc) == 0) 782 return EIO; 783 784 return (*tp->t_linesw->l_read)(tp, uio, flag); 785 } 786 787 int 788 plcomwrite(dev_t dev, struct uio *uio, int flag) 789 { 790 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(dev)); 791 struct tty *tp = sc->sc_tty; 792 793 if (PLCOM_ISALIVE(sc) == 0) 794 return EIO; 795 796 return (*tp->t_linesw->l_write)(tp, uio, flag); 797 } 798 799 int 800 plcompoll(dev_t dev, int events, struct lwp *l) 801 { 802 struct plcom_softc *sc = device_lookup(&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 = device_lookup(&plcom_cd, PLCOMUNIT(dev)); 815 struct tty *tp = sc->sc_tty; 816 817 return tp; 818 } 819 820 int 821 plcomioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 822 { 823 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(dev)); 824 struct tty *tp = sc->sc_tty; 825 int error; 826 int s; 827 828 if (PLCOM_ISALIVE(sc) == 0) 829 return EIO; 830 831 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 832 if (error != EPASSTHROUGH) 833 return error; 834 835 error = ttioctl(tp, cmd, data, flag, l); 836 if (error != EPASSTHROUGH) 837 return error; 838 839 error = 0; 840 841 s = splserial(); 842 PLCOM_LOCK(sc); 843 844 switch (cmd) { 845 case TIOCSBRK: 846 plcom_break(sc, 1); 847 break; 848 849 case TIOCCBRK: 850 plcom_break(sc, 0); 851 break; 852 853 case TIOCSDTR: 854 plcom_modem(sc, 1); 855 break; 856 857 case TIOCCDTR: 858 plcom_modem(sc, 0); 859 break; 860 861 case TIOCGFLAGS: 862 *(int *)data = sc->sc_swflags; 863 break; 864 865 case TIOCSFLAGS: 866 error = kauth_authorize_device_tty(l->l_cred, 867 KAUTH_DEVICE_TTY_PRIVSET, tp); 868 if (error) 869 break; 870 sc->sc_swflags = *(int *)data; 871 break; 872 873 case TIOCMSET: 874 case TIOCMBIS: 875 case TIOCMBIC: 876 tiocm_to_plcom(sc, cmd, *(int *)data); 877 break; 878 879 case TIOCMGET: 880 *(int *)data = plcom_to_tiocm(sc); 881 break; 882 883 case PPS_IOC_CREATE: 884 break; 885 886 case PPS_IOC_DESTROY: 887 break; 888 889 case PPS_IOC_GETPARAMS: { 890 pps_params_t *pp; 891 pp = (pps_params_t *)data; 892 *pp = sc->ppsparam; 893 break; 894 } 895 896 case PPS_IOC_SETPARAMS: { 897 pps_params_t *pp; 898 int mode; 899 pp = (pps_params_t *)data; 900 if (pp->mode & ~ppscap) { 901 error = EINVAL; 902 break; 903 } 904 sc->ppsparam = *pp; 905 /* 906 * Compute msr masks from user-specified timestamp state. 907 */ 908 mode = sc->ppsparam.mode; 909 #ifdef PPS_SYNC 910 if (mode & PPS_HARDPPSONASSERT) { 911 mode |= PPS_CAPTUREASSERT; 912 /* XXX revoke any previous HARDPPS source */ 913 } 914 if (mode & PPS_HARDPPSONCLEAR) { 915 mode |= PPS_CAPTURECLEAR; 916 /* XXX revoke any previous HARDPPS source */ 917 } 918 #endif /* PPS_SYNC */ 919 switch (mode & PPS_CAPTUREBOTH) { 920 case 0: 921 sc->sc_ppsmask = 0; 922 break; 923 924 case PPS_CAPTUREASSERT: 925 sc->sc_ppsmask = MSR_DCD; 926 sc->sc_ppsassert = MSR_DCD; 927 sc->sc_ppsclear = -1; 928 break; 929 930 case PPS_CAPTURECLEAR: 931 sc->sc_ppsmask = MSR_DCD; 932 sc->sc_ppsassert = -1; 933 sc->sc_ppsclear = 0; 934 break; 935 936 case PPS_CAPTUREBOTH: 937 sc->sc_ppsmask = MSR_DCD; 938 sc->sc_ppsassert = MSR_DCD; 939 sc->sc_ppsclear = 0; 940 break; 941 942 default: 943 error = EINVAL; 944 break; 945 } 946 break; 947 } 948 949 case PPS_IOC_GETCAP: 950 *(int*)data = ppscap; 951 break; 952 953 case PPS_IOC_FETCH: { 954 pps_info_t *pi; 955 pi = (pps_info_t *)data; 956 *pi = sc->ppsinfo; 957 break; 958 } 959 960 case TIOCDCDTIMESTAMP: /* XXX old, overloaded API used by xntpd v3 */ 961 /* 962 * Some GPS clocks models use the falling rather than 963 * rising edge as the on-the-second signal. 964 * The old API has no way to specify PPS polarity. 965 */ 966 sc->sc_ppsmask = MSR_DCD; 967 #ifndef PPS_TRAILING_EDGE 968 sc->sc_ppsassert = MSR_DCD; 969 sc->sc_ppsclear = -1; 970 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 971 &sc->ppsinfo.assert_timestamp); 972 #else 973 sc->sc_ppsassert = -1 974 sc->sc_ppsclear = 0; 975 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 976 &sc->ppsinfo.clear_timestamp); 977 #endif 978 break; 979 980 default: 981 error = EPASSTHROUGH; 982 break; 983 } 984 985 PLCOM_UNLOCK(sc); 986 splx(s); 987 988 #ifdef PLCOM_DEBUG 989 if (plcom_debug) 990 plcomstatus(sc, "plcomioctl "); 991 #endif 992 993 return error; 994 } 995 996 integrate void 997 plcom_schedrx(struct plcom_softc *sc) 998 { 999 1000 sc->sc_rx_ready = 1; 1001 1002 /* Wake up the poller. */ 1003 softint_schedule(sc->sc_si); 1004 } 1005 1006 void 1007 plcom_break(struct plcom_softc *sc, int onoff) 1008 { 1009 1010 if (onoff) 1011 SET(sc->sc_lcr, LCR_BRK); 1012 else 1013 CLR(sc->sc_lcr, LCR_BRK); 1014 1015 if (!sc->sc_heldchange) { 1016 if (sc->sc_tx_busy) { 1017 sc->sc_heldtbc = sc->sc_tbc; 1018 sc->sc_tbc = 0; 1019 sc->sc_heldchange = 1; 1020 } else 1021 plcom_loadchannelregs(sc); 1022 } 1023 } 1024 1025 void 1026 plcom_modem(struct plcom_softc *sc, int onoff) 1027 { 1028 1029 if (sc->sc_mcr_dtr == 0) 1030 return; 1031 1032 if (onoff) 1033 SET(sc->sc_mcr, sc->sc_mcr_dtr); 1034 else 1035 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 1036 1037 if (!sc->sc_heldchange) { 1038 if (sc->sc_tx_busy) { 1039 sc->sc_heldtbc = sc->sc_tbc; 1040 sc->sc_tbc = 0; 1041 sc->sc_heldchange = 1; 1042 } else 1043 plcom_loadchannelregs(sc); 1044 } 1045 } 1046 1047 void 1048 tiocm_to_plcom(struct plcom_softc *sc, u_long how, int ttybits) 1049 { 1050 u_char plcombits; 1051 1052 plcombits = 0; 1053 if (ISSET(ttybits, TIOCM_DTR)) 1054 SET(plcombits, MCR_DTR); 1055 if (ISSET(ttybits, TIOCM_RTS)) 1056 SET(plcombits, MCR_RTS); 1057 1058 switch (how) { 1059 case TIOCMBIC: 1060 CLR(sc->sc_mcr, plcombits); 1061 break; 1062 1063 case TIOCMBIS: 1064 SET(sc->sc_mcr, plcombits); 1065 break; 1066 1067 case TIOCMSET: 1068 CLR(sc->sc_mcr, MCR_DTR | MCR_RTS); 1069 SET(sc->sc_mcr, plcombits); 1070 break; 1071 } 1072 1073 if (!sc->sc_heldchange) { 1074 if (sc->sc_tx_busy) { 1075 sc->sc_heldtbc = sc->sc_tbc; 1076 sc->sc_tbc = 0; 1077 sc->sc_heldchange = 1; 1078 } else 1079 plcom_loadchannelregs(sc); 1080 } 1081 } 1082 1083 int 1084 plcom_to_tiocm(struct plcom_softc *sc) 1085 { 1086 u_char plcombits; 1087 int ttybits = 0; 1088 1089 plcombits = sc->sc_mcr; 1090 if (ISSET(plcombits, MCR_DTR)) 1091 SET(ttybits, TIOCM_DTR); 1092 if (ISSET(plcombits, MCR_RTS)) 1093 SET(ttybits, TIOCM_RTS); 1094 1095 plcombits = sc->sc_msr; 1096 if (ISSET(plcombits, MSR_DCD)) 1097 SET(ttybits, TIOCM_CD); 1098 if (ISSET(plcombits, MSR_CTS)) 1099 SET(ttybits, TIOCM_CTS); 1100 if (ISSET(plcombits, MSR_DSR)) 1101 SET(ttybits, TIOCM_DSR); 1102 1103 if (sc->sc_cr != 0) 1104 SET(ttybits, TIOCM_LE); 1105 1106 return ttybits; 1107 } 1108 1109 static u_char 1110 cflag2lcr(tcflag_t cflag) 1111 { 1112 u_char lcr = 0; 1113 1114 switch (ISSET(cflag, CSIZE)) { 1115 case CS5: 1116 SET(lcr, LCR_5BITS); 1117 break; 1118 case CS6: 1119 SET(lcr, LCR_6BITS); 1120 break; 1121 case CS7: 1122 SET(lcr, LCR_7BITS); 1123 break; 1124 case CS8: 1125 SET(lcr, LCR_8BITS); 1126 break; 1127 } 1128 if (ISSET(cflag, PARENB)) { 1129 SET(lcr, LCR_PEN); 1130 if (!ISSET(cflag, PARODD)) 1131 SET(lcr, LCR_EPS); 1132 } 1133 if (ISSET(cflag, CSTOPB)) 1134 SET(lcr, LCR_STP2); 1135 1136 return lcr; 1137 } 1138 1139 int 1140 plcomparam(struct tty *tp, struct termios *t) 1141 { 1142 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(tp->t_dev)); 1143 int ospeed; 1144 u_char lcr; 1145 int s; 1146 1147 if (PLCOM_ISALIVE(sc) == 0) 1148 return EIO; 1149 1150 ospeed = plcomspeed(t->c_ospeed, sc->sc_frequency); 1151 1152 /* Check requested parameters. */ 1153 if (ospeed < 0) 1154 return EINVAL; 1155 if (t->c_ispeed && t->c_ispeed != t->c_ospeed) 1156 return EINVAL; 1157 1158 /* 1159 * For the console, always force CLOCAL and !HUPCL, so that the port 1160 * is always active. 1161 */ 1162 if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) || 1163 ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE)) { 1164 SET(t->c_cflag, CLOCAL); 1165 CLR(t->c_cflag, HUPCL); 1166 } 1167 1168 /* 1169 * If there were no changes, don't do anything. This avoids dropping 1170 * input and improves performance when all we did was frob things like 1171 * VMIN and VTIME. 1172 */ 1173 if (tp->t_ospeed == t->c_ospeed && 1174 tp->t_cflag == t->c_cflag) 1175 return 0; 1176 1177 lcr = ISSET(sc->sc_lcr, LCR_BRK) | cflag2lcr(t->c_cflag); 1178 1179 s = splserial(); 1180 PLCOM_LOCK(sc); 1181 1182 sc->sc_lcr = lcr; 1183 1184 /* 1185 * PL010 has a fixed-length FIFO trigger point. 1186 */ 1187 if (ISSET(sc->sc_hwflags, PLCOM_HW_FIFO)) 1188 sc->sc_fifo = 1; 1189 else 1190 sc->sc_fifo = 0; 1191 1192 if (sc->sc_fifo) 1193 SET(sc->sc_lcr, LCR_FEN); 1194 1195 /* 1196 * If we're not in a mode that assumes a connection is present, then 1197 * ignore carrier changes. 1198 */ 1199 if (ISSET(t->c_cflag, CLOCAL | MDMBUF)) 1200 sc->sc_msr_dcd = 0; 1201 else 1202 sc->sc_msr_dcd = MSR_DCD; 1203 /* 1204 * Set the flow control pins depending on the current flow control 1205 * mode. 1206 */ 1207 if (ISSET(t->c_cflag, CRTSCTS)) { 1208 sc->sc_mcr_dtr = MCR_DTR; 1209 sc->sc_mcr_rts = MCR_RTS; 1210 sc->sc_msr_cts = MSR_CTS; 1211 } else if (ISSET(t->c_cflag, MDMBUF)) { 1212 /* 1213 * For DTR/DCD flow control, make sure we don't toggle DTR for 1214 * carrier detection. 1215 */ 1216 sc->sc_mcr_dtr = 0; 1217 sc->sc_mcr_rts = MCR_DTR; 1218 sc->sc_msr_cts = MSR_DCD; 1219 } else { 1220 /* 1221 * If no flow control, then always set RTS. This will make 1222 * the other side happy if it mistakenly thinks we're doing 1223 * RTS/CTS flow control. 1224 */ 1225 sc->sc_mcr_dtr = MCR_DTR | MCR_RTS; 1226 sc->sc_mcr_rts = 0; 1227 sc->sc_msr_cts = 0; 1228 if (ISSET(sc->sc_mcr, MCR_DTR)) 1229 SET(sc->sc_mcr, MCR_RTS); 1230 else 1231 CLR(sc->sc_mcr, MCR_RTS); 1232 } 1233 sc->sc_msr_mask = sc->sc_msr_cts | sc->sc_msr_dcd; 1234 1235 #if 0 1236 if (ospeed == 0) 1237 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 1238 else 1239 SET(sc->sc_mcr, sc->sc_mcr_dtr); 1240 #endif 1241 1242 sc->sc_dlbl = ospeed; 1243 sc->sc_dlbh = ospeed >> 8; 1244 1245 /* And copy to tty. */ 1246 tp->t_ispeed = 0; 1247 tp->t_ospeed = t->c_ospeed; 1248 tp->t_cflag = t->c_cflag; 1249 1250 if (!sc->sc_heldchange) { 1251 if (sc->sc_tx_busy) { 1252 sc->sc_heldtbc = sc->sc_tbc; 1253 sc->sc_tbc = 0; 1254 sc->sc_heldchange = 1; 1255 } else 1256 plcom_loadchannelregs(sc); 1257 } 1258 1259 if (!ISSET(t->c_cflag, CHWFLOW)) { 1260 /* Disable the high water mark. */ 1261 sc->sc_r_hiwat = 0; 1262 sc->sc_r_lowat = 0; 1263 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1264 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1265 plcom_schedrx(sc); 1266 } 1267 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 1268 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 1269 plcom_hwiflow(sc); 1270 } 1271 } else { 1272 sc->sc_r_hiwat = plcom_rbuf_hiwat; 1273 sc->sc_r_lowat = plcom_rbuf_lowat; 1274 } 1275 1276 PLCOM_UNLOCK(sc); 1277 splx(s); 1278 1279 /* 1280 * Update the tty layer's idea of the carrier bit, in case we changed 1281 * CLOCAL or MDMBUF. We don't hang up here; we only do that by 1282 * explicit request. 1283 */ 1284 (void) (*tp->t_linesw->l_modem)(tp, ISSET(sc->sc_msr, MSR_DCD)); 1285 1286 #ifdef PLCOM_DEBUG 1287 if (plcom_debug) 1288 plcomstatus(sc, "plcomparam "); 1289 #endif 1290 1291 if (!ISSET(t->c_cflag, CHWFLOW)) { 1292 if (sc->sc_tx_stopped) { 1293 sc->sc_tx_stopped = 0; 1294 plcomstart(tp); 1295 } 1296 } 1297 1298 return 0; 1299 } 1300 1301 void 1302 plcom_iflush(struct plcom_softc *sc) 1303 { 1304 bus_space_tag_t iot = sc->sc_iot; 1305 bus_space_handle_t ioh = sc->sc_ioh; 1306 #ifdef DIAGNOSTIC 1307 int reg; 1308 #endif 1309 int timo; 1310 1311 #ifdef DIAGNOSTIC 1312 reg = 0xffff; 1313 #endif 1314 timo = 50000; 1315 /* flush any pending I/O */ 1316 while (! ISSET(bus_space_read_1(iot, ioh, plcom_fr), FR_RXFE) 1317 && --timo) 1318 #ifdef DIAGNOSTIC 1319 reg = 1320 #else 1321 (void) 1322 #endif 1323 bus_space_read_1(iot, ioh, plcom_dr); 1324 #ifdef DIAGNOSTIC 1325 if (!timo) 1326 printf("%s: plcom_iflush timeout %02x\n", sc->sc_dev.dv_xname, 1327 reg); 1328 #endif 1329 } 1330 1331 void 1332 plcom_loadchannelregs(struct plcom_softc *sc) 1333 { 1334 bus_space_tag_t iot = sc->sc_iot; 1335 bus_space_handle_t ioh = sc->sc_ioh; 1336 1337 /* XXXXX necessary? */ 1338 plcom_iflush(sc); 1339 1340 bus_space_write_1(iot, ioh, plcom_cr, 0); 1341 1342 bus_space_write_1(iot, ioh, plcom_dlbl, sc->sc_dlbl); 1343 bus_space_write_1(iot, ioh, plcom_dlbh, sc->sc_dlbh); 1344 bus_space_write_1(iot, ioh, plcom_lcr, sc->sc_lcr); 1345 /* XXX device_unit() abuse */ 1346 sc->sc_set_mcr(sc->sc_set_mcr_arg, device_unit(&sc->sc_dev), 1347 sc->sc_mcr_active = sc->sc_mcr); 1348 1349 bus_space_write_1(iot, ioh, plcom_cr, sc->sc_cr); 1350 } 1351 1352 int 1353 plcomhwiflow(struct tty *tp, int block) 1354 { 1355 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(tp->t_dev)); 1356 int s; 1357 1358 if (PLCOM_ISALIVE(sc) == 0) 1359 return 0; 1360 1361 if (sc->sc_mcr_rts == 0) 1362 return 0; 1363 1364 s = splserial(); 1365 PLCOM_LOCK(sc); 1366 1367 if (block) { 1368 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1369 SET(sc->sc_rx_flags, RX_TTY_BLOCKED); 1370 plcom_hwiflow(sc); 1371 } 1372 } else { 1373 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1374 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1375 plcom_schedrx(sc); 1376 } 1377 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1378 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED); 1379 plcom_hwiflow(sc); 1380 } 1381 } 1382 1383 PLCOM_UNLOCK(sc); 1384 splx(s); 1385 return 1; 1386 } 1387 1388 /* 1389 * (un)block input via hw flowcontrol 1390 */ 1391 void 1392 plcom_hwiflow(struct plcom_softc *sc) 1393 { 1394 if (sc->sc_mcr_rts == 0) 1395 return; 1396 1397 if (ISSET(sc->sc_rx_flags, RX_ANY_BLOCK)) { 1398 CLR(sc->sc_mcr, sc->sc_mcr_rts); 1399 CLR(sc->sc_mcr_active, sc->sc_mcr_rts); 1400 } else { 1401 SET(sc->sc_mcr, sc->sc_mcr_rts); 1402 SET(sc->sc_mcr_active, sc->sc_mcr_rts); 1403 } 1404 /* XXX device_unit() abuse */ 1405 sc->sc_set_mcr(sc->sc_set_mcr_arg, device_unit(&sc->sc_dev), 1406 sc->sc_mcr_active); 1407 } 1408 1409 1410 void 1411 plcomstart(struct tty *tp) 1412 { 1413 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(tp->t_dev)); 1414 bus_space_tag_t iot = sc->sc_iot; 1415 bus_space_handle_t ioh = sc->sc_ioh; 1416 int s; 1417 1418 if (PLCOM_ISALIVE(sc) == 0) 1419 return; 1420 1421 s = spltty(); 1422 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 1423 goto out; 1424 if (sc->sc_tx_stopped) 1425 goto out; 1426 1427 if (!ttypull(tp)) 1428 goto out; 1429 1430 /* Grab the first contiguous region of buffer space. */ 1431 { 1432 u_char *tba; 1433 int tbc; 1434 1435 tba = tp->t_outq.c_cf; 1436 tbc = ndqb(&tp->t_outq, 0); 1437 1438 (void)splserial(); 1439 PLCOM_LOCK(sc); 1440 1441 sc->sc_tba = tba; 1442 sc->sc_tbc = tbc; 1443 } 1444 1445 SET(tp->t_state, TS_BUSY); 1446 sc->sc_tx_busy = 1; 1447 1448 /* Enable transmit completion interrupts if necessary. */ 1449 if (!ISSET(sc->sc_cr, CR_TIE)) { 1450 SET(sc->sc_cr, CR_TIE); 1451 bus_space_write_1(iot, ioh, plcom_cr, sc->sc_cr); 1452 } 1453 1454 /* Output the first chunk of the contiguous buffer. */ 1455 { 1456 int n; 1457 1458 n = sc->sc_tbc; 1459 if (n > sc->sc_fifolen) 1460 n = sc->sc_fifolen; 1461 bus_space_write_multi_1(iot, ioh, plcom_dr, sc->sc_tba, n); 1462 sc->sc_tbc -= n; 1463 sc->sc_tba += n; 1464 } 1465 PLCOM_UNLOCK(sc); 1466 out: 1467 splx(s); 1468 return; 1469 } 1470 1471 /* 1472 * Stop output on a line. 1473 */ 1474 void 1475 plcomstop(struct tty *tp, int flag) 1476 { 1477 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(tp->t_dev)); 1478 int s; 1479 1480 s = splserial(); 1481 PLCOM_LOCK(sc); 1482 if (ISSET(tp->t_state, TS_BUSY)) { 1483 /* Stop transmitting at the next chunk. */ 1484 sc->sc_tbc = 0; 1485 sc->sc_heldtbc = 0; 1486 if (!ISSET(tp->t_state, TS_TTSTOP)) 1487 SET(tp->t_state, TS_FLUSH); 1488 } 1489 PLCOM_UNLOCK(sc); 1490 splx(s); 1491 } 1492 1493 void 1494 plcomdiag(void *arg) 1495 { 1496 struct plcom_softc *sc = arg; 1497 int overflows, floods; 1498 int s; 1499 1500 s = splserial(); 1501 PLCOM_LOCK(sc); 1502 overflows = sc->sc_overflows; 1503 sc->sc_overflows = 0; 1504 floods = sc->sc_floods; 1505 sc->sc_floods = 0; 1506 sc->sc_errors = 0; 1507 PLCOM_UNLOCK(sc); 1508 splx(s); 1509 1510 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1511 sc->sc_dev.dv_xname, 1512 overflows, overflows == 1 ? "" : "s", 1513 floods, floods == 1 ? "" : "s"); 1514 } 1515 1516 integrate void 1517 plcom_rxsoft(struct plcom_softc *sc, struct tty *tp) 1518 { 1519 int (*rint) (int, struct tty *) = tp->t_linesw->l_rint; 1520 u_char *get, *end; 1521 u_int cc, scc; 1522 u_char rsr; 1523 int code; 1524 int s; 1525 1526 end = sc->sc_ebuf; 1527 get = sc->sc_rbget; 1528 scc = cc = plcom_rbuf_size - sc->sc_rbavail; 1529 1530 if (cc == plcom_rbuf_size) { 1531 sc->sc_floods++; 1532 if (sc->sc_errors++ == 0) 1533 callout_reset(&sc->sc_diag_callout, 60 * hz, 1534 plcomdiag, sc); 1535 } 1536 1537 while (cc) { 1538 code = get[0]; 1539 rsr = get[1]; 1540 if (ISSET(rsr, RSR_OE | RSR_BE | RSR_FE | RSR_PE)) { 1541 if (ISSET(rsr, RSR_OE)) { 1542 sc->sc_overflows++; 1543 if (sc->sc_errors++ == 0) 1544 callout_reset(&sc->sc_diag_callout, 1545 60 * hz, plcomdiag, sc); 1546 } 1547 if (ISSET(rsr, RSR_BE | RSR_FE)) 1548 SET(code, TTY_FE); 1549 if (ISSET(rsr, RSR_PE)) 1550 SET(code, TTY_PE); 1551 } 1552 if ((*rint)(code, tp) == -1) { 1553 /* 1554 * The line discipline's buffer is out of space. 1555 */ 1556 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1557 /* 1558 * We're either not using flow control, or the 1559 * line discipline didn't tell us to block for 1560 * some reason. Either way, we have no way to 1561 * know when there's more space available, so 1562 * just drop the rest of the data. 1563 */ 1564 get += cc << 1; 1565 if (get >= end) 1566 get -= plcom_rbuf_size << 1; 1567 cc = 0; 1568 } else { 1569 /* 1570 * Don't schedule any more receive processing 1571 * until the line discipline tells us there's 1572 * space available (through plcomhwiflow()). 1573 * Leave the rest of the data in the input 1574 * buffer. 1575 */ 1576 SET(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1577 } 1578 break; 1579 } 1580 get += 2; 1581 if (get >= end) 1582 get = sc->sc_rbuf; 1583 cc--; 1584 } 1585 1586 if (cc != scc) { 1587 sc->sc_rbget = get; 1588 s = splserial(); 1589 PLCOM_LOCK(sc); 1590 1591 cc = sc->sc_rbavail += scc - cc; 1592 /* Buffers should be ok again, release possible block. */ 1593 if (cc >= sc->sc_r_lowat) { 1594 if (ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1595 CLR(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1596 SET(sc->sc_cr, CR_RIE | CR_RTIE); 1597 bus_space_write_1(sc->sc_iot, sc->sc_ioh, plcom_cr, sc->sc_cr); 1598 } 1599 if (ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED)) { 1600 CLR(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1601 plcom_hwiflow(sc); 1602 } 1603 } 1604 PLCOM_UNLOCK(sc); 1605 splx(s); 1606 } 1607 } 1608 1609 integrate void 1610 plcom_txsoft(struct plcom_softc *sc, struct tty *tp) 1611 { 1612 1613 CLR(tp->t_state, TS_BUSY); 1614 if (ISSET(tp->t_state, TS_FLUSH)) 1615 CLR(tp->t_state, TS_FLUSH); 1616 else 1617 ndflush(&tp->t_outq, (int)(sc->sc_tba - tp->t_outq.c_cf)); 1618 (*tp->t_linesw->l_start)(tp); 1619 } 1620 1621 integrate void 1622 plcom_stsoft(struct plcom_softc *sc, struct tty *tp) 1623 { 1624 u_char msr, delta; 1625 int s; 1626 1627 s = splserial(); 1628 PLCOM_LOCK(sc); 1629 msr = sc->sc_msr; 1630 delta = sc->sc_msr_delta; 1631 sc->sc_msr_delta = 0; 1632 PLCOM_UNLOCK(sc); 1633 splx(s); 1634 1635 if (ISSET(delta, sc->sc_msr_dcd)) { 1636 /* 1637 * Inform the tty layer that carrier detect changed. 1638 */ 1639 (void) (*tp->t_linesw->l_modem)(tp, ISSET(msr, MSR_DCD)); 1640 } 1641 1642 if (ISSET(delta, sc->sc_msr_cts)) { 1643 /* Block or unblock output according to flow control. */ 1644 if (ISSET(msr, sc->sc_msr_cts)) { 1645 sc->sc_tx_stopped = 0; 1646 (*tp->t_linesw->l_start)(tp); 1647 } else { 1648 sc->sc_tx_stopped = 1; 1649 } 1650 } 1651 1652 #ifdef PLCOM_DEBUG 1653 if (plcom_debug) 1654 plcomstatus(sc, "plcom_stsoft"); 1655 #endif 1656 } 1657 1658 void 1659 plcomsoft(void *arg) 1660 { 1661 struct plcom_softc *sc = arg; 1662 struct tty *tp; 1663 1664 if (PLCOM_ISALIVE(sc) == 0) 1665 return; 1666 1667 tp = sc->sc_tty; 1668 1669 if (sc->sc_rx_ready) { 1670 sc->sc_rx_ready = 0; 1671 plcom_rxsoft(sc, tp); 1672 } 1673 1674 if (sc->sc_st_check) { 1675 sc->sc_st_check = 0; 1676 plcom_stsoft(sc, tp); 1677 } 1678 1679 if (sc->sc_tx_done) { 1680 sc->sc_tx_done = 0; 1681 plcom_txsoft(sc, tp); 1682 } 1683 } 1684 1685 int 1686 plcomintr(void *arg) 1687 { 1688 struct plcom_softc *sc = arg; 1689 bus_space_tag_t iot = sc->sc_iot; 1690 bus_space_handle_t ioh = sc->sc_ioh; 1691 u_char *put, *end; 1692 u_int cc; 1693 u_char rsr, iir; 1694 1695 if (PLCOM_ISALIVE(sc) == 0) 1696 return 0; 1697 1698 PLCOM_LOCK(sc); 1699 iir = bus_space_read_1(iot, ioh, plcom_iir); 1700 if (! ISSET(iir, IIR_IMASK)) { 1701 PLCOM_UNLOCK(sc); 1702 return 0; 1703 } 1704 1705 end = sc->sc_ebuf; 1706 put = sc->sc_rbput; 1707 cc = sc->sc_rbavail; 1708 1709 do { 1710 u_char msr, delta, fr; 1711 1712 fr = bus_space_read_1(iot, ioh, plcom_fr); 1713 1714 if (!ISSET(fr, FR_RXFE) && 1715 !ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1716 while (cc > 0) { 1717 int cn_trapped = 0; 1718 put[0] = bus_space_read_1(iot, ioh, 1719 plcom_dr); 1720 rsr = bus_space_read_1(iot, ioh, plcom_rsr); 1721 /* Clear any error status. */ 1722 if (ISSET(rsr, 1723 (RSR_BE | RSR_OE | RSR_PE | RSR_FE))) 1724 bus_space_write_1(iot, ioh, plcom_ecr, 1725 0); 1726 if (ISSET(rsr, RSR_BE)) { 1727 cn_trapped = 0; 1728 cn_check_magic(sc->sc_tty->t_dev, 1729 CNC_BREAK, plcom_cnm_state); 1730 if (cn_trapped) 1731 continue; 1732 #if defined(KGDB) 1733 if (ISSET(sc->sc_hwflags, 1734 PLCOM_HW_KGDB)) { 1735 kgdb_connect(1); 1736 continue; 1737 } 1738 #endif 1739 } 1740 1741 put[1] = rsr; 1742 cn_trapped = 0; 1743 cn_check_magic(sc->sc_tty->t_dev, 1744 put[0], plcom_cnm_state); 1745 if (cn_trapped) { 1746 fr = bus_space_read_1(iot, ioh, 1747 plcom_fr); 1748 if (ISSET(fr, FR_RXFE)) 1749 break; 1750 1751 continue; 1752 } 1753 put += 2; 1754 if (put >= end) 1755 put = sc->sc_rbuf; 1756 cc--; 1757 1758 fr = bus_space_read_1(iot, ioh, plcom_fr); 1759 if (ISSET(fr, FR_RXFE)) 1760 break; 1761 } 1762 1763 /* 1764 * Current string of incoming characters ended because 1765 * no more data was available or we ran out of space. 1766 * Schedule a receive event if any data was received. 1767 * If we're out of space, turn off receive interrupts. 1768 */ 1769 sc->sc_rbput = put; 1770 sc->sc_rbavail = cc; 1771 if (!ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) 1772 sc->sc_rx_ready = 1; 1773 1774 /* 1775 * See if we are in danger of overflowing a buffer. If 1776 * so, use hardware flow control to ease the pressure. 1777 */ 1778 if (!ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED) && 1779 cc < sc->sc_r_hiwat) { 1780 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1781 plcom_hwiflow(sc); 1782 } 1783 1784 /* 1785 * If we're out of space, disable receive interrupts 1786 * until the queue has drained a bit. 1787 */ 1788 if (!cc) { 1789 SET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1790 CLR(sc->sc_cr, CR_RIE | CR_RTIE); 1791 bus_space_write_1(iot, ioh, plcom_cr, 1792 sc->sc_cr); 1793 } 1794 } else { 1795 if (ISSET(iir, IIR_RIS)) { 1796 bus_space_write_1(iot, ioh, plcom_cr, 0); 1797 delay(10); 1798 bus_space_write_1(iot, ioh, plcom_cr, 1799 sc->sc_cr); 1800 continue; 1801 } 1802 } 1803 1804 msr = bus_space_read_1(iot, ioh, plcom_fr); 1805 delta = msr ^ sc->sc_msr; 1806 sc->sc_msr = msr; 1807 /* Clear any pending modem status interrupt. */ 1808 if (iir & IIR_MIS) 1809 bus_space_write_1(iot, ioh, plcom_icr, 0); 1810 /* 1811 * Pulse-per-second (PSS) signals on edge of DCD? 1812 * Process these even if line discipline is ignoring DCD. 1813 */ 1814 if (delta & sc->sc_ppsmask) { 1815 struct timeval tv; 1816 if ((msr & sc->sc_ppsmask) == sc->sc_ppsassert) { 1817 /* XXX nanotime() */ 1818 microtime(&tv); 1819 TIMEVAL_TO_TIMESPEC(&tv, 1820 &sc->ppsinfo.assert_timestamp); 1821 if (sc->ppsparam.mode & PPS_OFFSETASSERT) { 1822 timespecadd(&sc->ppsinfo.assert_timestamp, 1823 &sc->ppsparam.assert_offset, 1824 &sc->ppsinfo.assert_timestamp); 1825 } 1826 1827 #ifdef PPS_SYNC 1828 if (sc->ppsparam.mode & PPS_HARDPPSONASSERT) 1829 hardpps(&tv, tv.tv_usec); 1830 #endif 1831 sc->ppsinfo.assert_sequence++; 1832 sc->ppsinfo.current_mode = sc->ppsparam.mode; 1833 1834 } else if ((msr & sc->sc_ppsmask) == sc->sc_ppsclear) { 1835 /* XXX nanotime() */ 1836 microtime(&tv); 1837 TIMEVAL_TO_TIMESPEC(&tv, 1838 &sc->ppsinfo.clear_timestamp); 1839 if (sc->ppsparam.mode & PPS_OFFSETCLEAR) { 1840 timespecadd(&sc->ppsinfo.clear_timestamp, 1841 &sc->ppsparam.clear_offset, 1842 &sc->ppsinfo.clear_timestamp); 1843 } 1844 1845 #ifdef PPS_SYNC 1846 if (sc->ppsparam.mode & PPS_HARDPPSONCLEAR) 1847 hardpps(&tv, tv.tv_usec); 1848 #endif 1849 sc->ppsinfo.clear_sequence++; 1850 sc->ppsinfo.current_mode = sc->ppsparam.mode; 1851 } 1852 } 1853 1854 /* 1855 * Process normal status changes 1856 */ 1857 if (ISSET(delta, sc->sc_msr_mask)) { 1858 SET(sc->sc_msr_delta, delta); 1859 1860 /* 1861 * Stop output immediately if we lose the output 1862 * flow control signal or carrier detect. 1863 */ 1864 if (ISSET(~msr, sc->sc_msr_mask)) { 1865 sc->sc_tbc = 0; 1866 sc->sc_heldtbc = 0; 1867 #ifdef PLCOM_DEBUG 1868 if (plcom_debug) 1869 plcomstatus(sc, "plcomintr "); 1870 #endif 1871 } 1872 1873 sc->sc_st_check = 1; 1874 } 1875 1876 /* 1877 * Done handling any receive interrupts. See if data 1878 * can be * transmitted as well. Schedule tx done 1879 * event if no data left * and tty was marked busy. 1880 */ 1881 if (ISSET(iir, IIR_TIS)) { 1882 /* 1883 * If we've delayed a parameter change, do it 1884 * now, and restart * output. 1885 */ 1886 if (sc->sc_heldchange) { 1887 plcom_loadchannelregs(sc); 1888 sc->sc_heldchange = 0; 1889 sc->sc_tbc = sc->sc_heldtbc; 1890 sc->sc_heldtbc = 0; 1891 } 1892 1893 /* 1894 * Output the next chunk of the contiguous 1895 * buffer, if any. 1896 */ 1897 if (sc->sc_tbc > 0) { 1898 int n; 1899 1900 n = sc->sc_tbc; 1901 if (n > sc->sc_fifolen) 1902 n = sc->sc_fifolen; 1903 bus_space_write_multi_1(iot, ioh, plcom_dr, 1904 sc->sc_tba, n); 1905 sc->sc_tbc -= n; 1906 sc->sc_tba += n; 1907 } else { 1908 /* 1909 * Disable transmit plcompletion 1910 * interrupts if necessary. 1911 */ 1912 if (ISSET(sc->sc_cr, CR_TIE)) { 1913 CLR(sc->sc_cr, CR_TIE); 1914 bus_space_write_1(iot, ioh, plcom_cr, 1915 sc->sc_cr); 1916 } 1917 if (sc->sc_tx_busy) { 1918 sc->sc_tx_busy = 0; 1919 sc->sc_tx_done = 1; 1920 } 1921 } 1922 } 1923 } while (ISSET((iir = bus_space_read_1(iot, ioh, plcom_iir)), 1924 IIR_IMASK)); 1925 1926 PLCOM_UNLOCK(sc); 1927 1928 /* Wake up the poller. */ 1929 softint_schedule(sc->sc_si); 1930 1931 #if NRND > 0 && defined(RND_COM) 1932 rnd_add_uint32(&sc->rnd_source, iir | rsr); 1933 #endif 1934 1935 return 1; 1936 } 1937 1938 /* 1939 * The following functions are polled getc and putc routines, shared 1940 * by the console and kgdb glue. 1941 * 1942 * The read-ahead code is so that you can detect pending in-band 1943 * cn_magic in polled mode while doing output rather than having to 1944 * wait until the kernel decides it needs input. 1945 */ 1946 1947 #define MAX_READAHEAD 20 1948 static int plcom_readahead[MAX_READAHEAD]; 1949 static int plcom_readaheadcount = 0; 1950 1951 int 1952 plcom_common_getc(dev_t dev, bus_space_tag_t iot, bus_space_handle_t ioh) 1953 { 1954 int s = splserial(); 1955 u_char stat, c; 1956 1957 /* got a character from reading things earlier */ 1958 if (plcom_readaheadcount > 0) { 1959 int i; 1960 1961 c = plcom_readahead[0]; 1962 for (i = 1; i < plcom_readaheadcount; i++) { 1963 plcom_readahead[i-1] = plcom_readahead[i]; 1964 } 1965 plcom_readaheadcount--; 1966 splx(s); 1967 return c; 1968 } 1969 1970 /* block until a character becomes available */ 1971 while (ISSET(stat = bus_space_read_1(iot, ioh, plcom_fr), FR_RXFE)) 1972 ; 1973 1974 c = bus_space_read_1(iot, ioh, plcom_dr); 1975 stat = bus_space_read_1(iot, ioh, plcom_iir); 1976 { 1977 int cn_trapped = 0; /* unused */ 1978 #ifdef DDB 1979 extern int db_active; 1980 if (!db_active) 1981 #endif 1982 cn_check_magic(dev, c, plcom_cnm_state); 1983 } 1984 splx(s); 1985 return c; 1986 } 1987 1988 void 1989 plcom_common_putc(dev_t dev, bus_space_tag_t iot, bus_space_handle_t ioh, 1990 int c) 1991 { 1992 int s = splserial(); 1993 int timo; 1994 1995 int cin, stat; 1996 if (plcom_readaheadcount < MAX_READAHEAD 1997 && !ISSET(stat = bus_space_read_1(iot, ioh, plcom_fr), FR_RXFE)) { 1998 int cn_trapped = 0; 1999 cin = bus_space_read_1(iot, ioh, plcom_dr); 2000 stat = bus_space_read_1(iot, ioh, plcom_iir); 2001 cn_check_magic(dev, cin, plcom_cnm_state); 2002 plcom_readahead[plcom_readaheadcount++] = cin; 2003 } 2004 2005 /* wait for any pending transmission to finish */ 2006 timo = 150000; 2007 while (!ISSET(bus_space_read_1(iot, ioh, plcom_fr), FR_TXFE) && --timo) 2008 continue; 2009 2010 bus_space_write_1(iot, ioh, plcom_dr, c); 2011 PLCOM_BARRIER(iot, ioh, BR | BW); 2012 2013 /* wait for this transmission to complete */ 2014 timo = 1500000; 2015 while (!ISSET(bus_space_read_1(iot, ioh, plcom_fr), FR_TXFE) && --timo) 2016 continue; 2017 2018 splx(s); 2019 } 2020 2021 /* 2022 * Initialize UART for use as console or KGDB line. 2023 */ 2024 int 2025 plcominit(bus_space_tag_t iot, bus_addr_t iobase, int rate, int frequency, 2026 tcflag_t cflag, bus_space_handle_t *iohp) 2027 { 2028 bus_space_handle_t ioh; 2029 2030 if (bus_space_map(iot, iobase, PLCOM_UART_SIZE, 0, &ioh)) 2031 return ENOMEM; /* ??? */ 2032 2033 rate = plcomspeed(rate, frequency); 2034 bus_space_write_1(iot, ioh, plcom_cr, 0); 2035 bus_space_write_1(iot, ioh, plcom_dlbl, rate); 2036 bus_space_write_1(iot, ioh, plcom_dlbh, rate >> 8); 2037 bus_space_write_1(iot, ioh, plcom_lcr, cflag2lcr(cflag) | LCR_FEN); 2038 bus_space_write_1(iot, ioh, plcom_cr, CR_UARTEN); 2039 2040 #if 0 2041 /* Ought to do something like this, but we have no sc to 2042 dereference. */ 2043 /* XXX device_unit() abuse */ 2044 sc->sc_set_mcr(sc->sc_set_mcr_arg, device_unit(&sc->sc_dev), 2045 MCR_DTR | MCR_RTS); 2046 #endif 2047 2048 *iohp = ioh; 2049 return 0; 2050 } 2051 2052 /* 2053 * Following are all routines needed for PLCOM to act as console 2054 */ 2055 struct consdev plcomcons = { 2056 NULL, NULL, plcomcngetc, plcomcnputc, plcomcnpollc, NULL, 2057 NULL, NULL, NODEV, CN_NORMAL 2058 }; 2059 2060 2061 int 2062 plcomcnattach(bus_space_tag_t iot, bus_addr_t iobase, int rate, int frequency, 2063 tcflag_t cflag, int unit) 2064 { 2065 int res; 2066 2067 res = plcominit(iot, iobase, rate, frequency, cflag, &plcomconsioh); 2068 if (res) 2069 return res; 2070 2071 cn_tab = &plcomcons; 2072 cn_init_magic(&plcom_cnm_state); 2073 cn_set_magic("\047\001"); /* default magic is BREAK */ 2074 2075 plcomconstag = iot; 2076 plcomconsunit = unit; 2077 plcomconsrate = rate; 2078 plcomconscflag = cflag; 2079 2080 return 0; 2081 } 2082 2083 void 2084 plcomcndetach(void) 2085 { 2086 bus_space_unmap(plcomconstag, plcomconsioh, PLCOM_UART_SIZE); 2087 plcomconstag = NULL; 2088 2089 cn_tab = NULL; 2090 } 2091 2092 int 2093 plcomcngetc(dev_t dev) 2094 { 2095 return plcom_common_getc(dev, plcomconstag, plcomconsioh); 2096 } 2097 2098 /* 2099 * Console kernel output character routine. 2100 */ 2101 void 2102 plcomcnputc(dev_t dev, int c) 2103 { 2104 plcom_common_putc(dev, plcomconstag, plcomconsioh, c); 2105 } 2106 2107 void 2108 plcomcnpollc(dev_t dev, int on) 2109 { 2110 2111 } 2112 2113 #ifdef KGDB 2114 int 2115 plcom_kgdb_attach(bus_space_tag_t iot, bus_addr_t iobase, int rate, 2116 int frequency, tcflag_t cflag, int unit) 2117 { 2118 int res; 2119 2120 if (iot == plcomconstag && iobase == plcomconsunit) 2121 return EBUSY; /* cannot share with console */ 2122 2123 res = plcominit(iot, iobase, rate, frequency, cflag, &plcom_kgdb_ioh); 2124 if (res) 2125 return res; 2126 2127 kgdb_attach(plcom_kgdb_getc, plcom_kgdb_putc, NULL); 2128 kgdb_dev = 123; /* unneeded, only to satisfy some tests */ 2129 2130 plcom_kgdb_iot = iot; 2131 plcom_kgdb_unit = unit; 2132 2133 return 0; 2134 } 2135 2136 /* ARGSUSED */ 2137 int 2138 plcom_kgdb_getc(void *arg) 2139 { 2140 return plcom_common_getc(NODEV, plcom_kgdb_iot, plcom_kgdb_ioh); 2141 } 2142 2143 /* ARGSUSED */ 2144 void 2145 plcom_kgdb_putc(void *arg, int c) 2146 { 2147 plcom_common_putc(NODEV, plcom_kgdb_iot, plcom_kgdb_ioh, c); 2148 } 2149 #endif /* KGDB */ 2150 2151 /* helper function to identify the plcom ports used by 2152 console or KGDB (and not yet autoconf attached) */ 2153 int 2154 plcom_is_console(bus_space_tag_t iot, int unit, 2155 bus_space_handle_t *ioh) 2156 { 2157 bus_space_handle_t help; 2158 2159 if (!plcomconsattached && 2160 iot == plcomconstag && unit == plcomconsunit) 2161 help = plcomconsioh; 2162 #ifdef KGDB 2163 else if (!plcom_kgdb_attached && 2164 iot == plcom_kgdb_iot && unit == plcom_kgdb_unit) 2165 help = plcom_kgdb_ioh; 2166 #endif 2167 else 2168 return 0; 2169 2170 if (ioh) 2171 *ioh = help; 2172 return 1; 2173 } 2174
Indexes created Fri Oct 17 17:09:57 GMT 2025