plcom.c revision 1.30
1 /* $NetBSD: plcom.c,v 1.30 2009/11/21 20:32:28 rmind 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 1.30 2009/11/21 20:32:28 rmind 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/conf.h> 129 #include <sys/file.h> 130 #include <sys/uio.h> 131 #include <sys/kernel.h> 132 #include <sys/syslog.h> 133 #include <sys/types.h> 134 #include <sys/device.h> 135 #include <sys/malloc.h> 136 #include <sys/timepps.h> 137 #include <sys/vnode.h> 138 #include <sys/kauth.h> 139 #include <sys/intr.h> 140 #include <sys/bus.h> 141 142 #include <evbarm/dev/plcomreg.h> 143 #include <evbarm/dev/plcomvar.h> 144 145 #include <dev/cons.h> 146 147 static void plcom_enable_debugport (struct plcom_softc *); 148 149 void plcom_config (struct plcom_softc *); 150 void plcom_shutdown (struct plcom_softc *); 151 int plcomspeed (long, long); 152 static u_char cflag2lcr (tcflag_t); 153 int plcomparam (struct tty *, struct termios *); 154 void plcomstart (struct tty *); 155 int plcomhwiflow (struct tty *, int); 156 157 void plcom_loadchannelregs (struct plcom_softc *); 158 void plcom_hwiflow (struct plcom_softc *); 159 void plcom_break (struct plcom_softc *, int); 160 void plcom_modem (struct plcom_softc *, int); 161 void tiocm_to_plcom (struct plcom_softc *, u_long, int); 162 int plcom_to_tiocm (struct plcom_softc *); 163 void plcom_iflush (struct plcom_softc *); 164 165 int plcom_common_getc (dev_t, bus_space_tag_t, bus_space_handle_t); 166 void plcom_common_putc (dev_t, bus_space_tag_t, bus_space_handle_t, int); 167 168 int plcominit (bus_space_tag_t, bus_addr_t, int, int, tcflag_t, 169 bus_space_handle_t *); 170 171 dev_type_open(plcomopen); 172 dev_type_close(plcomclose); 173 dev_type_read(plcomread); 174 dev_type_write(plcomwrite); 175 dev_type_ioctl(plcomioctl); 176 dev_type_stop(plcomstop); 177 dev_type_tty(plcomtty); 178 dev_type_poll(plcompoll); 179 180 int plcomcngetc (dev_t); 181 void plcomcnputc (dev_t, int); 182 void plcomcnpollc (dev_t, int); 183 184 #define integrate static inline 185 void plcomsoft (void *); 186 integrate void plcom_rxsoft (struct plcom_softc *, struct tty *); 187 integrate void plcom_txsoft (struct plcom_softc *, struct tty *); 188 integrate void plcom_stsoft (struct plcom_softc *, struct tty *); 189 integrate void plcom_schedrx (struct plcom_softc *); 190 void plcomdiag (void *); 191 192 extern struct cfdriver plcom_cd; 193 194 const struct cdevsw plcom_cdevsw = { 195 plcomopen, plcomclose, plcomread, plcomwrite, plcomioctl, 196 plcomstop, plcomtty, plcompoll, nommap, ttykqfilter, D_TTY 197 }; 198 199 /* 200 * Make this an option variable one can patch. 201 * But be warned: this must be a power of 2! 202 */ 203 u_int plcom_rbuf_size = PLCOM_RING_SIZE; 204 205 /* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */ 206 u_int plcom_rbuf_hiwat = (PLCOM_RING_SIZE * 1) / 4; 207 u_int plcom_rbuf_lowat = (PLCOM_RING_SIZE * 3) / 4; 208 209 static int plcomconsunit = -1; 210 static bus_space_tag_t plcomconstag; 211 static bus_space_handle_t plcomconsioh; 212 static int plcomconsattached; 213 static int plcomconsrate; 214 static tcflag_t plcomconscflag; 215 static struct cnm_state plcom_cnm_state; 216 217 static int ppscap = 218 PPS_TSFMT_TSPEC | 219 PPS_CAPTUREASSERT | 220 PPS_CAPTURECLEAR | 221 #ifdef PPS_SYNC 222 PPS_HARDPPSONASSERT | PPS_HARDPPSONCLEAR | 223 #endif /* PPS_SYNC */ 224 PPS_OFFSETASSERT | PPS_OFFSETCLEAR; 225 226 #ifdef KGDB 227 #include <sys/kgdb.h> 228 229 static int plcom_kgdb_unit; 230 static bus_space_tag_t plcom_kgdb_iot; 231 static bus_space_handle_t plcom_kgdb_ioh; 232 static int plcom_kgdb_attached; 233 234 int plcom_kgdb_getc (void *); 235 void plcom_kgdb_putc (void *, int); 236 #endif /* KGDB */ 237 238 #define PLCOMUNIT_MASK 0x7ffff 239 #define PLCOMDIALOUT_MASK 0x80000 240 241 #define PLCOMUNIT(x) (minor(x) & PLCOMUNIT_MASK) 242 #define PLCOMDIALOUT(x) (minor(x) & PLCOMDIALOUT_MASK) 243 244 #define PLCOM_ISALIVE(sc) ((sc)->enabled != 0 && \ 245 device_is_active(&(sc)->sc_dev)) 246 247 #define BR BUS_SPACE_BARRIER_READ 248 #define BW BUS_SPACE_BARRIER_WRITE 249 #define PLCOM_BARRIER(t, h, f) bus_space_barrier((t), (h), 0, PLCOM_UART_SIZE, (f)) 250 251 #define PLCOM_LOCK(sc) simple_lock(&(sc)->sc_lock) 252 #define PLCOM_UNLOCK(sc) simple_unlock(&(sc)->sc_lock) 253 254 int 255 plcomspeed(long speed, long frequency) 256 { 257 #define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */ 258 259 int x, err; 260 261 #if 0 262 if (speed == 0) 263 return 0; 264 #endif 265 if (speed <= 0) 266 return -1; 267 x = divrnd(frequency / 16, speed); 268 if (x <= 0) 269 return -1; 270 err = divrnd(((quad_t)frequency) * 1000 / 16, speed * x) - 1000; 271 if (err < 0) 272 err = -err; 273 if (err > PLCOM_TOLERANCE) 274 return -1; 275 return x; 276 277 #undef divrnd 278 } 279 280 #ifdef PLCOM_DEBUG 281 int plcom_debug = 0; 282 283 void plcomstatus (struct plcom_softc *, char *); 284 void 285 plcomstatus(struct plcom_softc *sc, char *str) 286 { 287 struct tty *tp = sc->sc_tty; 288 289 printf("%s: %s %sclocal %sdcd %sts_carr_on %sdtr %stx_stopped\n", 290 sc->sc_dev.dv_xname, str, 291 ISSET(tp->t_cflag, CLOCAL) ? "+" : "-", 292 ISSET(sc->sc_msr, MSR_DCD) ? "+" : "-", 293 ISSET(tp->t_state, TS_CARR_ON) ? "+" : "-", 294 ISSET(sc->sc_mcr, MCR_DTR) ? "+" : "-", 295 sc->sc_tx_stopped ? "+" : "-"); 296 297 printf("%s: %s %scrtscts %scts %sts_ttstop %srts %xrx_flags\n", 298 sc->sc_dev.dv_xname, str, 299 ISSET(tp->t_cflag, CRTSCTS) ? "+" : "-", 300 ISSET(sc->sc_msr, MSR_CTS) ? "+" : "-", 301 ISSET(tp->t_state, TS_TTSTOP) ? "+" : "-", 302 ISSET(sc->sc_mcr, MCR_RTS) ? "+" : "-", 303 sc->sc_rx_flags); 304 } 305 #endif 306 307 int 308 plcomprobe1(bus_space_tag_t iot, bus_space_handle_t ioh) 309 { 310 int data; 311 312 /* Disable the UART. */ 313 bus_space_write_1(iot, ioh, plcom_cr, 0); 314 /* Make sure the FIFO is off. */ 315 bus_space_write_1(iot, ioh, plcom_lcr, LCR_8BITS); 316 /* Disable interrupts. */ 317 bus_space_write_1(iot, ioh, plcom_iir, 0); 318 319 /* Make sure we swallow anything in the receiving register. */ 320 data = bus_space_read_1(iot, ioh, plcom_dr); 321 322 if (bus_space_read_1(iot, ioh, plcom_lcr) != LCR_8BITS) 323 return 0; 324 325 data = bus_space_read_1(iot, ioh, plcom_fr) & (FR_RXFF | FR_RXFE); 326 327 if (data != FR_RXFE) 328 return 0; 329 330 return 1; 331 } 332 333 static void 334 plcom_enable_debugport(struct plcom_softc *sc) 335 { 336 int s; 337 338 /* Turn on line break interrupt, set carrier. */ 339 s = splserial(); 340 PLCOM_LOCK(sc); 341 sc->sc_cr = CR_RIE | CR_RTIE | CR_UARTEN; 342 bus_space_write_1(sc->sc_iot, sc->sc_ioh, plcom_cr, sc->sc_cr); 343 SET(sc->sc_mcr, MCR_DTR | MCR_RTS); 344 /* XXX device_unit() abuse */ 345 sc->sc_set_mcr(sc->sc_set_mcr_arg, device_unit(&sc->sc_dev), 346 sc->sc_mcr); 347 PLCOM_UNLOCK(sc); 348 splx(s); 349 } 350 351 void 352 plcom_attach_subr(struct plcom_softc *sc) 353 { 354 int unit = sc->sc_iounit; 355 bus_space_tag_t iot = sc->sc_iot; 356 bus_space_handle_t ioh = sc->sc_ioh; 357 struct tty *tp; 358 359 callout_init(&sc->sc_diag_callout, 0); 360 simple_lock_init(&sc->sc_lock); 361 362 /* Disable interrupts before configuring the device. */ 363 sc->sc_cr = 0; 364 365 if (plcomconstag && unit == plcomconsunit) { 366 plcomconsattached = 1; 367 368 plcomconstag = iot; 369 plcomconsioh = ioh; 370 371 /* Make sure the console is always "hardwired". */ 372 delay(1000); /* wait for output to finish */ 373 SET(sc->sc_hwflags, PLCOM_HW_CONSOLE); 374 SET(sc->sc_swflags, TIOCFLAG_SOFTCAR); 375 /* Must re-enable the console immediately, or we will 376 hang when trying to print. */ 377 sc->sc_cr = CR_UARTEN; 378 } 379 380 bus_space_write_1(iot, ioh, plcom_cr, sc->sc_cr); 381 382 /* The PL010 has a 16-byte fifo, but the tx interrupt triggers when 383 there is space for 8 more bytes. */ 384 sc->sc_fifolen = 8; 385 printf("\n"); 386 387 if (ISSET(sc->sc_hwflags, PLCOM_HW_TXFIFO_DISABLE)) { 388 sc->sc_fifolen = 1; 389 printf("%s: txfifo disabled\n", sc->sc_dev.dv_xname); 390 } 391 392 if (sc->sc_fifolen > 1) 393 SET(sc->sc_hwflags, PLCOM_HW_FIFO); 394 395 tp = ttymalloc(); 396 tp->t_oproc = plcomstart; 397 tp->t_param = plcomparam; 398 tp->t_hwiflow = plcomhwiflow; 399 400 sc->sc_tty = tp; 401 sc->sc_rbuf = malloc(plcom_rbuf_size << 1, M_DEVBUF, M_NOWAIT); 402 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 403 sc->sc_rbavail = plcom_rbuf_size; 404 if (sc->sc_rbuf == NULL) { 405 printf("%s: unable to allocate ring buffer\n", 406 sc->sc_dev.dv_xname); 407 return; 408 } 409 sc->sc_ebuf = sc->sc_rbuf + (plcom_rbuf_size << 1); 410 411 tty_attach(tp); 412 413 if (ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE)) { 414 int maj; 415 416 /* locate the major number */ 417 maj = cdevsw_lookup_major(&plcom_cdevsw); 418 419 cn_tab->cn_dev = makedev(maj, device_unit(&sc->sc_dev)); 420 421 printf("%s: console\n", sc->sc_dev.dv_xname); 422 } 423 424 #ifdef KGDB 425 /* 426 * Allow kgdb to "take over" this port. If this is 427 * the kgdb device, it has exclusive use. 428 */ 429 if (iot == plcom_kgdb_iot && unit == plcom_kgdb_unit) { 430 plcom_kgdb_attached = 1; 431 432 SET(sc->sc_hwflags, PLCOM_HW_KGDB); 433 printf("%s: kgdb\n", sc->sc_dev.dv_xname); 434 } 435 #endif 436 437 sc->sc_si = softint_establish(SOFTINT_SERIAL, plcomsoft, sc); 438 439 #if NRND > 0 && defined(RND_COM) 440 rnd_attach_source(&sc->rnd_source, sc->sc_dev.dv_xname, 441 RND_TYPE_TTY, 0); 442 #endif 443 444 /* if there are no enable/disable functions, assume the device 445 is always enabled */ 446 if (!sc->enable) 447 sc->enabled = 1; 448 449 plcom_config(sc); 450 451 SET(sc->sc_hwflags, PLCOM_HW_DEV_OK); 452 } 453 454 void 455 plcom_config(struct plcom_softc *sc) 456 { 457 bus_space_tag_t iot = sc->sc_iot; 458 bus_space_handle_t ioh = sc->sc_ioh; 459 460 /* Disable interrupts before configuring the device. */ 461 sc->sc_cr = 0; 462 bus_space_write_1(iot, ioh, plcom_cr, sc->sc_cr); 463 464 if (ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE|PLCOM_HW_KGDB)) 465 plcom_enable_debugport(sc); 466 } 467 468 int 469 plcom_detach(struct device *self, int flags) 470 { 471 struct plcom_softc *sc = (struct plcom_softc *)self; 472 int maj, mn; 473 474 /* locate the major number */ 475 maj = cdevsw_lookup_major(&plcom_cdevsw); 476 477 /* Nuke the vnodes for any open instances. */ 478 mn = device_unit(self); 479 vdevgone(maj, mn, mn, VCHR); 480 481 mn |= PLCOMDIALOUT_MASK; 482 vdevgone(maj, mn, mn, VCHR); 483 484 /* Free the receive buffer. */ 485 free(sc->sc_rbuf, M_DEVBUF); 486 487 /* Detach and free the tty. */ 488 tty_detach(sc->sc_tty); 489 ttyfree(sc->sc_tty); 490 491 /* Unhook the soft interrupt handler. */ 492 softint_disestablish(sc->sc_si); 493 494 #if NRND > 0 && defined(RND_COM) 495 /* Unhook the entropy source. */ 496 rnd_detach_source(&sc->rnd_source); 497 #endif 498 499 return 0; 500 } 501 502 int 503 plcom_activate(struct device *self, enum devact act) 504 { 505 struct plcom_softc *sc = (struct plcom_softc *)self; 506 int s, rv = 0; 507 508 s = splserial(); 509 PLCOM_LOCK(sc); 510 switch (act) { 511 case DVACT_ACTIVATE: 512 rv = EOPNOTSUPP; 513 break; 514 515 case DVACT_DEACTIVATE: 516 if (sc->sc_hwflags & (PLCOM_HW_CONSOLE|PLCOM_HW_KGDB)) { 517 rv = EBUSY; 518 break; 519 } 520 521 if (sc->disable != NULL && sc->enabled != 0) { 522 (*sc->disable)(sc); 523 sc->enabled = 0; 524 } 525 break; 526 } 527 528 PLCOM_UNLOCK(sc); 529 splx(s); 530 return rv; 531 } 532 533 void 534 plcom_shutdown(struct plcom_softc *sc) 535 { 536 struct tty *tp = sc->sc_tty; 537 int s; 538 539 s = splserial(); 540 PLCOM_LOCK(sc); 541 542 /* If we were asserting flow control, then deassert it. */ 543 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 544 plcom_hwiflow(sc); 545 546 /* Clear any break condition set with TIOCSBRK. */ 547 plcom_break(sc, 0); 548 549 /* Turn off PPS capture on last close. */ 550 mutex_spin_enter(&timecounter_lock); 551 sc->sc_ppsmask = 0; 552 sc->ppsparam.mode = 0; 553 mutex_spin_exit(&timecounter_lock); 554 555 /* 556 * Hang up if necessary. Wait a bit, so the other side has time to 557 * notice even if we immediately open the port again. 558 * Avoid tsleeping above splhigh(). 559 */ 560 if (ISSET(tp->t_cflag, HUPCL)) { 561 plcom_modem(sc, 0); 562 PLCOM_UNLOCK(sc); 563 splx(s); 564 /* XXX tsleep will only timeout */ 565 (void) tsleep(sc, TTIPRI, ttclos, hz); 566 s = splserial(); 567 PLCOM_LOCK(sc); 568 } 569 570 /* Turn off interrupts. */ 571 if (ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE)) 572 /* interrupt on break */ 573 sc->sc_cr = CR_RIE | CR_RTIE | CR_UARTEN; 574 else 575 sc->sc_cr = 0; 576 bus_space_write_1(sc->sc_iot, sc->sc_ioh, plcom_cr, sc->sc_cr); 577 578 if (sc->disable) { 579 #ifdef DIAGNOSTIC 580 if (!sc->enabled) 581 panic("plcom_shutdown: not enabled?"); 582 #endif 583 (*sc->disable)(sc); 584 sc->enabled = 0; 585 } 586 PLCOM_UNLOCK(sc); 587 splx(s); 588 } 589 590 int 591 plcomopen(dev_t dev, int flag, int mode, struct lwp *l) 592 { 593 struct plcom_softc *sc; 594 struct tty *tp; 595 int s, s2; 596 int error; 597 598 sc = device_lookup_private(&plcom_cd, PLCOMUNIT(dev)); 599 if (sc == NULL || !ISSET(sc->sc_hwflags, PLCOM_HW_DEV_OK) || 600 sc->sc_rbuf == NULL) 601 return ENXIO; 602 603 if (!device_is_active(&sc->sc_dev)) 604 return ENXIO; 605 606 #ifdef KGDB 607 /* 608 * If this is the kgdb port, no other use is permitted. 609 */ 610 if (ISSET(sc->sc_hwflags, PLCOM_HW_KGDB)) 611 return EBUSY; 612 #endif 613 614 tp = sc->sc_tty; 615 616 if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp)) 617 return (EBUSY); 618 619 s = spltty(); 620 621 /* 622 * Do the following iff this is a first open. 623 */ 624 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 625 struct termios t; 626 627 tp->t_dev = dev; 628 629 s2 = splserial(); 630 PLCOM_LOCK(sc); 631 632 if (sc->enable) { 633 if ((*sc->enable)(sc)) { 634 PLCOM_UNLOCK(sc); 635 splx(s2); 636 splx(s); 637 printf("%s: device enable failed\n", 638 sc->sc_dev.dv_xname); 639 return EIO; 640 } 641 sc->enabled = 1; 642 plcom_config(sc); 643 } 644 645 /* Turn on interrupts. */ 646 /* IER_ERXRDY | IER_ERLS | IER_EMSC; */ 647 sc->sc_cr = CR_RIE | CR_RTIE | CR_MSIE | CR_UARTEN; 648 bus_space_write_1(sc->sc_iot, sc->sc_ioh, plcom_cr, sc->sc_cr); 649 650 /* Fetch the current modem control status, needed later. */ 651 sc->sc_msr = bus_space_read_1(sc->sc_iot, sc->sc_ioh, plcom_fr); 652 653 /* Clear PPS capture state on first open. */ 654 655 mutex_spin_enter(&timecounter_lock); 656 sc->sc_ppsmask = 0; 657 sc->ppsparam.mode = 0; 658 mutex_spin_exit(&timecounter_lock); 659 660 PLCOM_UNLOCK(sc); 661 splx(s2); 662 663 /* 664 * Initialize the termios status to the defaults. Add in the 665 * sticky bits from TIOCSFLAGS. 666 */ 667 t.c_ispeed = 0; 668 if (ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE)) { 669 t.c_ospeed = plcomconsrate; 670 t.c_cflag = plcomconscflag; 671 } else { 672 t.c_ospeed = TTYDEF_SPEED; 673 t.c_cflag = TTYDEF_CFLAG; 674 } 675 if (ISSET(sc->sc_swflags, TIOCFLAG_CLOCAL)) 676 SET(t.c_cflag, CLOCAL); 677 if (ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS)) 678 SET(t.c_cflag, CRTSCTS); 679 if (ISSET(sc->sc_swflags, TIOCFLAG_MDMBUF)) 680 SET(t.c_cflag, MDMBUF); 681 /* Make sure plcomparam() will do something. */ 682 tp->t_ospeed = 0; 683 (void) plcomparam(tp, &t); 684 tp->t_iflag = TTYDEF_IFLAG; 685 tp->t_oflag = TTYDEF_OFLAG; 686 tp->t_lflag = TTYDEF_LFLAG; 687 ttychars(tp); 688 ttsetwater(tp); 689 690 s2 = splserial(); 691 PLCOM_LOCK(sc); 692 693 /* 694 * Turn on DTR. We must always do this, even if carrier is not 695 * present, because otherwise we'd have to use TIOCSDTR 696 * immediately after setting CLOCAL, which applications do not 697 * expect. We always assert DTR while the device is open 698 * unless explicitly requested to deassert it. 699 */ 700 plcom_modem(sc, 1); 701 702 /* Clear the input ring, and unblock. */ 703 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 704 sc->sc_rbavail = plcom_rbuf_size; 705 plcom_iflush(sc); 706 CLR(sc->sc_rx_flags, RX_ANY_BLOCK); 707 plcom_hwiflow(sc); 708 709 #ifdef PLCOM_DEBUG 710 if (plcom_debug) 711 plcomstatus(sc, "plcomopen "); 712 #endif 713 714 PLCOM_UNLOCK(sc); 715 splx(s2); 716 } 717 718 splx(s); 719 720 error = ttyopen(tp, PLCOMDIALOUT(dev), ISSET(flag, O_NONBLOCK)); 721 if (error) 722 goto bad; 723 724 error = (*tp->t_linesw->l_open)(dev, tp); 725 if (error) 726 goto bad; 727 728 return 0; 729 730 bad: 731 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 732 /* 733 * We failed to open the device, and nobody else had it opened. 734 * Clean up the state as appropriate. 735 */ 736 plcom_shutdown(sc); 737 } 738 739 return error; 740 } 741 742 int 743 plcomclose(dev_t dev, int flag, int mode, struct lwp *l) 744 { 745 struct plcom_softc *sc = 746 device_lookup_private(&plcom_cd, PLCOMUNIT(dev)); 747 struct tty *tp = sc->sc_tty; 748 749 /* XXX This is for cons.c. */ 750 if (!ISSET(tp->t_state, TS_ISOPEN)) 751 return 0; 752 753 (*tp->t_linesw->l_close)(tp, flag); 754 ttyclose(tp); 755 756 if (PLCOM_ISALIVE(sc) == 0) 757 return 0; 758 759 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 760 /* 761 * Although we got a last close, the device may still be in 762 * use; e.g. if this was the dialout node, and there are still 763 * processes waiting for carrier on the non-dialout node. 764 */ 765 plcom_shutdown(sc); 766 } 767 768 return 0; 769 } 770 771 int 772 plcomread(dev_t dev, struct uio *uio, int flag) 773 { 774 struct plcom_softc *sc = 775 device_lookup_private(&plcom_cd, PLCOMUNIT(dev)); 776 struct tty *tp = sc->sc_tty; 777 778 if (PLCOM_ISALIVE(sc) == 0) 779 return EIO; 780 781 return (*tp->t_linesw->l_read)(tp, uio, flag); 782 } 783 784 int 785 plcomwrite(dev_t dev, struct uio *uio, int flag) 786 { 787 struct plcom_softc *sc = 788 device_lookup_private(&plcom_cd, PLCOMUNIT(dev)); 789 struct tty *tp = sc->sc_tty; 790 791 if (PLCOM_ISALIVE(sc) == 0) 792 return EIO; 793 794 return (*tp->t_linesw->l_write)(tp, uio, flag); 795 } 796 797 int 798 plcompoll(dev_t dev, int events, struct lwp *l) 799 { 800 struct plcom_softc *sc = 801 device_lookup_private(&plcom_cd, PLCOMUNIT(dev)); 802 struct tty *tp = sc->sc_tty; 803 804 if (PLCOM_ISALIVE(sc) == 0) 805 return EIO; 806 807 return (*tp->t_linesw->l_poll)(tp, events, l); 808 } 809 810 struct tty * 811 plcomtty(dev_t dev) 812 { 813 struct plcom_softc *sc = 814 device_lookup_private(&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 = 824 device_lookup_private(&plcom_cd, PLCOMUNIT(dev)); 825 struct tty *tp = sc->sc_tty; 826 int error; 827 int s; 828 829 if (PLCOM_ISALIVE(sc) == 0) 830 return EIO; 831 832 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 833 if (error != EPASSTHROUGH) 834 return error; 835 836 error = ttioctl(tp, cmd, data, flag, l); 837 if (error != EPASSTHROUGH) 838 return error; 839 840 error = 0; 841 842 s = splserial(); 843 PLCOM_LOCK(sc); 844 845 switch (cmd) { 846 case TIOCSBRK: 847 plcom_break(sc, 1); 848 break; 849 850 case TIOCCBRK: 851 plcom_break(sc, 0); 852 break; 853 854 case TIOCSDTR: 855 plcom_modem(sc, 1); 856 break; 857 858 case TIOCCDTR: 859 plcom_modem(sc, 0); 860 break; 861 862 case TIOCGFLAGS: 863 *(int *)data = sc->sc_swflags; 864 break; 865 866 case TIOCSFLAGS: 867 error = kauth_authorize_device_tty(l->l_cred, 868 KAUTH_DEVICE_TTY_PRIVSET, tp); 869 if (error) 870 break; 871 sc->sc_swflags = *(int *)data; 872 break; 873 874 case TIOCMSET: 875 case TIOCMBIS: 876 case TIOCMBIC: 877 tiocm_to_plcom(sc, cmd, *(int *)data); 878 break; 879 880 case TIOCMGET: 881 *(int *)data = plcom_to_tiocm(sc); 882 break; 883 884 case PPS_IOC_CREATE: 885 break; 886 887 case PPS_IOC_DESTROY: 888 break; 889 890 case PPS_IOC_GETPARAMS: { 891 pps_params_t *pp; 892 pp = (pps_params_t *)data; 893 mutex_spin_enter(&timecounter_lock); 894 *pp = sc->ppsparam; 895 mutex_spin_exit(&timecounter_lock); 896 break; 897 } 898 899 case PPS_IOC_SETPARAMS: { 900 pps_params_t *pp; 901 int mode; 902 pp = (pps_params_t *)data; 903 mutex_spin_enter(&timecounter_lock); 904 if (pp->mode & ~ppscap) { 905 error = EINVAL; 906 mutex_spin_exit(&timecounter_lock); 907 break; 908 } 909 sc->ppsparam = *pp; 910 /* 911 * Compute msr masks from user-specified timestamp state. 912 */ 913 mode = sc->ppsparam.mode; 914 #ifdef PPS_SYNC 915 if (mode & PPS_HARDPPSONASSERT) { 916 mode |= PPS_CAPTUREASSERT; 917 /* XXX revoke any previous HARDPPS source */ 918 } 919 if (mode & PPS_HARDPPSONCLEAR) { 920 mode |= PPS_CAPTURECLEAR; 921 /* XXX revoke any previous HARDPPS source */ 922 } 923 #endif /* PPS_SYNC */ 924 switch (mode & PPS_CAPTUREBOTH) { 925 case 0: 926 sc->sc_ppsmask = 0; 927 break; 928 929 case PPS_CAPTUREASSERT: 930 sc->sc_ppsmask = MSR_DCD; 931 sc->sc_ppsassert = MSR_DCD; 932 sc->sc_ppsclear = -1; 933 break; 934 935 case PPS_CAPTURECLEAR: 936 sc->sc_ppsmask = MSR_DCD; 937 sc->sc_ppsassert = -1; 938 sc->sc_ppsclear = 0; 939 break; 940 941 case PPS_CAPTUREBOTH: 942 sc->sc_ppsmask = MSR_DCD; 943 sc->sc_ppsassert = MSR_DCD; 944 sc->sc_ppsclear = 0; 945 break; 946 947 default: 948 error = EINVAL; 949 break; 950 } 951 mutex_spin_exit(&timecounter_lock); 952 break; 953 } 954 955 case PPS_IOC_GETCAP: 956 *(int*)data = ppscap; 957 break; 958 959 case PPS_IOC_FETCH: { 960 pps_info_t *pi; 961 pi = (pps_info_t *)data; 962 mutex_spin_enter(&timecounter_lock); 963 *pi = sc->ppsinfo; 964 mutex_spin_exit(&timecounter_lock); 965 break; 966 } 967 968 case TIOCDCDTIMESTAMP: /* XXX old, overloaded API used by xntpd v3 */ 969 /* 970 * Some GPS clocks models use the falling rather than 971 * rising edge as the on-the-second signal. 972 * The old API has no way to specify PPS polarity. 973 */ 974 mutex_spin_enter(&timecounter_lock); 975 sc->sc_ppsmask = MSR_DCD; 976 #ifndef PPS_TRAILING_EDGE 977 sc->sc_ppsassert = MSR_DCD; 978 sc->sc_ppsclear = -1; 979 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 980 &sc->ppsinfo.assert_timestamp); 981 #else 982 sc->sc_ppsassert = -1 983 sc->sc_ppsclear = 0; 984 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 985 &sc->ppsinfo.clear_timestamp); 986 #endif 987 mutex_spin_exit(&timecounter_lock); 988 break; 989 990 default: 991 error = EPASSTHROUGH; 992 break; 993 } 994 995 PLCOM_UNLOCK(sc); 996 splx(s); 997 998 #ifdef PLCOM_DEBUG 999 if (plcom_debug) 1000 plcomstatus(sc, "plcomioctl "); 1001 #endif 1002 1003 return error; 1004 } 1005 1006 integrate void 1007 plcom_schedrx(struct plcom_softc *sc) 1008 { 1009 1010 sc->sc_rx_ready = 1; 1011 1012 /* Wake up the poller. */ 1013 softint_schedule(sc->sc_si); 1014 } 1015 1016 void 1017 plcom_break(struct plcom_softc *sc, int onoff) 1018 { 1019 1020 if (onoff) 1021 SET(sc->sc_lcr, LCR_BRK); 1022 else 1023 CLR(sc->sc_lcr, LCR_BRK); 1024 1025 if (!sc->sc_heldchange) { 1026 if (sc->sc_tx_busy) { 1027 sc->sc_heldtbc = sc->sc_tbc; 1028 sc->sc_tbc = 0; 1029 sc->sc_heldchange = 1; 1030 } else 1031 plcom_loadchannelregs(sc); 1032 } 1033 } 1034 1035 void 1036 plcom_modem(struct plcom_softc *sc, int onoff) 1037 { 1038 1039 if (sc->sc_mcr_dtr == 0) 1040 return; 1041 1042 if (onoff) 1043 SET(sc->sc_mcr, sc->sc_mcr_dtr); 1044 else 1045 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 1046 1047 if (!sc->sc_heldchange) { 1048 if (sc->sc_tx_busy) { 1049 sc->sc_heldtbc = sc->sc_tbc; 1050 sc->sc_tbc = 0; 1051 sc->sc_heldchange = 1; 1052 } else 1053 plcom_loadchannelregs(sc); 1054 } 1055 } 1056 1057 void 1058 tiocm_to_plcom(struct plcom_softc *sc, u_long how, int ttybits) 1059 { 1060 u_char plcombits; 1061 1062 plcombits = 0; 1063 if (ISSET(ttybits, TIOCM_DTR)) 1064 SET(plcombits, MCR_DTR); 1065 if (ISSET(ttybits, TIOCM_RTS)) 1066 SET(plcombits, MCR_RTS); 1067 1068 switch (how) { 1069 case TIOCMBIC: 1070 CLR(sc->sc_mcr, plcombits); 1071 break; 1072 1073 case TIOCMBIS: 1074 SET(sc->sc_mcr, plcombits); 1075 break; 1076 1077 case TIOCMSET: 1078 CLR(sc->sc_mcr, MCR_DTR | MCR_RTS); 1079 SET(sc->sc_mcr, plcombits); 1080 break; 1081 } 1082 1083 if (!sc->sc_heldchange) { 1084 if (sc->sc_tx_busy) { 1085 sc->sc_heldtbc = sc->sc_tbc; 1086 sc->sc_tbc = 0; 1087 sc->sc_heldchange = 1; 1088 } else 1089 plcom_loadchannelregs(sc); 1090 } 1091 } 1092 1093 int 1094 plcom_to_tiocm(struct plcom_softc *sc) 1095 { 1096 u_char plcombits; 1097 int ttybits = 0; 1098 1099 plcombits = sc->sc_mcr; 1100 if (ISSET(plcombits, MCR_DTR)) 1101 SET(ttybits, TIOCM_DTR); 1102 if (ISSET(plcombits, MCR_RTS)) 1103 SET(ttybits, TIOCM_RTS); 1104 1105 plcombits = sc->sc_msr; 1106 if (ISSET(plcombits, MSR_DCD)) 1107 SET(ttybits, TIOCM_CD); 1108 if (ISSET(plcombits, MSR_CTS)) 1109 SET(ttybits, TIOCM_CTS); 1110 if (ISSET(plcombits, MSR_DSR)) 1111 SET(ttybits, TIOCM_DSR); 1112 1113 if (sc->sc_cr != 0) 1114 SET(ttybits, TIOCM_LE); 1115 1116 return ttybits; 1117 } 1118 1119 static u_char 1120 cflag2lcr(tcflag_t cflag) 1121 { 1122 u_char lcr = 0; 1123 1124 switch (ISSET(cflag, CSIZE)) { 1125 case CS5: 1126 SET(lcr, LCR_5BITS); 1127 break; 1128 case CS6: 1129 SET(lcr, LCR_6BITS); 1130 break; 1131 case CS7: 1132 SET(lcr, LCR_7BITS); 1133 break; 1134 case CS8: 1135 SET(lcr, LCR_8BITS); 1136 break; 1137 } 1138 if (ISSET(cflag, PARENB)) { 1139 SET(lcr, LCR_PEN); 1140 if (!ISSET(cflag, PARODD)) 1141 SET(lcr, LCR_EPS); 1142 } 1143 if (ISSET(cflag, CSTOPB)) 1144 SET(lcr, LCR_STP2); 1145 1146 return lcr; 1147 } 1148 1149 int 1150 plcomparam(struct tty *tp, struct termios *t) 1151 { 1152 struct plcom_softc *sc = 1153 device_lookup_private(&plcom_cd, PLCOMUNIT(tp->t_dev)); 1154 int ospeed; 1155 u_char lcr; 1156 int s; 1157 1158 if (PLCOM_ISALIVE(sc) == 0) 1159 return EIO; 1160 1161 ospeed = plcomspeed(t->c_ospeed, sc->sc_frequency); 1162 1163 /* Check requested parameters. */ 1164 if (ospeed < 0) 1165 return EINVAL; 1166 if (t->c_ispeed && t->c_ispeed != t->c_ospeed) 1167 return EINVAL; 1168 1169 /* 1170 * For the console, always force CLOCAL and !HUPCL, so that the port 1171 * is always active. 1172 */ 1173 if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) || 1174 ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE)) { 1175 SET(t->c_cflag, CLOCAL); 1176 CLR(t->c_cflag, HUPCL); 1177 } 1178 1179 /* 1180 * If there were no changes, don't do anything. This avoids dropping 1181 * input and improves performance when all we did was frob things like 1182 * VMIN and VTIME. 1183 */ 1184 if (tp->t_ospeed == t->c_ospeed && 1185 tp->t_cflag == t->c_cflag) 1186 return 0; 1187 1188 lcr = ISSET(sc->sc_lcr, LCR_BRK) | cflag2lcr(t->c_cflag); 1189 1190 s = splserial(); 1191 PLCOM_LOCK(sc); 1192 1193 sc->sc_lcr = lcr; 1194 1195 /* 1196 * PL010 has a fixed-length FIFO trigger point. 1197 */ 1198 if (ISSET(sc->sc_hwflags, PLCOM_HW_FIFO)) 1199 sc->sc_fifo = 1; 1200 else 1201 sc->sc_fifo = 0; 1202 1203 if (sc->sc_fifo) 1204 SET(sc->sc_lcr, LCR_FEN); 1205 1206 /* 1207 * If we're not in a mode that assumes a connection is present, then 1208 * ignore carrier changes. 1209 */ 1210 if (ISSET(t->c_cflag, CLOCAL | MDMBUF)) 1211 sc->sc_msr_dcd = 0; 1212 else 1213 sc->sc_msr_dcd = MSR_DCD; 1214 /* 1215 * Set the flow control pins depending on the current flow control 1216 * mode. 1217 */ 1218 if (ISSET(t->c_cflag, CRTSCTS)) { 1219 sc->sc_mcr_dtr = MCR_DTR; 1220 sc->sc_mcr_rts = MCR_RTS; 1221 sc->sc_msr_cts = MSR_CTS; 1222 } else if (ISSET(t->c_cflag, MDMBUF)) { 1223 /* 1224 * For DTR/DCD flow control, make sure we don't toggle DTR for 1225 * carrier detection. 1226 */ 1227 sc->sc_mcr_dtr = 0; 1228 sc->sc_mcr_rts = MCR_DTR; 1229 sc->sc_msr_cts = MSR_DCD; 1230 } else { 1231 /* 1232 * If no flow control, then always set RTS. This will make 1233 * the other side happy if it mistakenly thinks we're doing 1234 * RTS/CTS flow control. 1235 */ 1236 sc->sc_mcr_dtr = MCR_DTR | MCR_RTS; 1237 sc->sc_mcr_rts = 0; 1238 sc->sc_msr_cts = 0; 1239 if (ISSET(sc->sc_mcr, MCR_DTR)) 1240 SET(sc->sc_mcr, MCR_RTS); 1241 else 1242 CLR(sc->sc_mcr, MCR_RTS); 1243 } 1244 sc->sc_msr_mask = sc->sc_msr_cts | sc->sc_msr_dcd; 1245 1246 #if 0 1247 if (ospeed == 0) 1248 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 1249 else 1250 SET(sc->sc_mcr, sc->sc_mcr_dtr); 1251 #endif 1252 1253 sc->sc_dlbl = ospeed; 1254 sc->sc_dlbh = ospeed >> 8; 1255 1256 /* And copy to tty. */ 1257 tp->t_ispeed = 0; 1258 tp->t_ospeed = t->c_ospeed; 1259 tp->t_cflag = t->c_cflag; 1260 1261 if (!sc->sc_heldchange) { 1262 if (sc->sc_tx_busy) { 1263 sc->sc_heldtbc = sc->sc_tbc; 1264 sc->sc_tbc = 0; 1265 sc->sc_heldchange = 1; 1266 } else 1267 plcom_loadchannelregs(sc); 1268 } 1269 1270 if (!ISSET(t->c_cflag, CHWFLOW)) { 1271 /* Disable the high water mark. */ 1272 sc->sc_r_hiwat = 0; 1273 sc->sc_r_lowat = 0; 1274 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1275 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1276 plcom_schedrx(sc); 1277 } 1278 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 1279 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 1280 plcom_hwiflow(sc); 1281 } 1282 } else { 1283 sc->sc_r_hiwat = plcom_rbuf_hiwat; 1284 sc->sc_r_lowat = plcom_rbuf_lowat; 1285 } 1286 1287 PLCOM_UNLOCK(sc); 1288 splx(s); 1289 1290 /* 1291 * Update the tty layer's idea of the carrier bit, in case we changed 1292 * CLOCAL or MDMBUF. We don't hang up here; we only do that by 1293 * explicit request. 1294 */ 1295 (void) (*tp->t_linesw->l_modem)(tp, ISSET(sc->sc_msr, MSR_DCD)); 1296 1297 #ifdef PLCOM_DEBUG 1298 if (plcom_debug) 1299 plcomstatus(sc, "plcomparam "); 1300 #endif 1301 1302 if (!ISSET(t->c_cflag, CHWFLOW)) { 1303 if (sc->sc_tx_stopped) { 1304 sc->sc_tx_stopped = 0; 1305 plcomstart(tp); 1306 } 1307 } 1308 1309 return 0; 1310 } 1311 1312 void 1313 plcom_iflush(struct plcom_softc *sc) 1314 { 1315 bus_space_tag_t iot = sc->sc_iot; 1316 bus_space_handle_t ioh = sc->sc_ioh; 1317 #ifdef DIAGNOSTIC 1318 int reg; 1319 #endif 1320 int timo; 1321 1322 #ifdef DIAGNOSTIC 1323 reg = 0xffff; 1324 #endif 1325 timo = 50000; 1326 /* flush any pending I/O */ 1327 while (! ISSET(bus_space_read_1(iot, ioh, plcom_fr), FR_RXFE) 1328 && --timo) 1329 #ifdef DIAGNOSTIC 1330 reg = 1331 #else 1332 (void) 1333 #endif 1334 bus_space_read_1(iot, ioh, plcom_dr); 1335 #ifdef DIAGNOSTIC 1336 if (!timo) 1337 printf("%s: plcom_iflush timeout %02x\n", sc->sc_dev.dv_xname, 1338 reg); 1339 #endif 1340 } 1341 1342 void 1343 plcom_loadchannelregs(struct plcom_softc *sc) 1344 { 1345 bus_space_tag_t iot = sc->sc_iot; 1346 bus_space_handle_t ioh = sc->sc_ioh; 1347 1348 /* XXXXX necessary? */ 1349 plcom_iflush(sc); 1350 1351 bus_space_write_1(iot, ioh, plcom_cr, 0); 1352 1353 bus_space_write_1(iot, ioh, plcom_dlbl, sc->sc_dlbl); 1354 bus_space_write_1(iot, ioh, plcom_dlbh, sc->sc_dlbh); 1355 bus_space_write_1(iot, ioh, plcom_lcr, sc->sc_lcr); 1356 /* XXX device_unit() abuse */ 1357 sc->sc_set_mcr(sc->sc_set_mcr_arg, device_unit(&sc->sc_dev), 1358 sc->sc_mcr_active = sc->sc_mcr); 1359 1360 bus_space_write_1(iot, ioh, plcom_cr, sc->sc_cr); 1361 } 1362 1363 int 1364 plcomhwiflow(struct tty *tp, int block) 1365 { 1366 struct plcom_softc *sc = 1367 device_lookup_private(&plcom_cd, PLCOMUNIT(tp->t_dev)); 1368 int s; 1369 1370 if (PLCOM_ISALIVE(sc) == 0) 1371 return 0; 1372 1373 if (sc->sc_mcr_rts == 0) 1374 return 0; 1375 1376 s = splserial(); 1377 PLCOM_LOCK(sc); 1378 1379 if (block) { 1380 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1381 SET(sc->sc_rx_flags, RX_TTY_BLOCKED); 1382 plcom_hwiflow(sc); 1383 } 1384 } else { 1385 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1386 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1387 plcom_schedrx(sc); 1388 } 1389 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1390 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED); 1391 plcom_hwiflow(sc); 1392 } 1393 } 1394 1395 PLCOM_UNLOCK(sc); 1396 splx(s); 1397 return 1; 1398 } 1399 1400 /* 1401 * (un)block input via hw flowcontrol 1402 */ 1403 void 1404 plcom_hwiflow(struct plcom_softc *sc) 1405 { 1406 if (sc->sc_mcr_rts == 0) 1407 return; 1408 1409 if (ISSET(sc->sc_rx_flags, RX_ANY_BLOCK)) { 1410 CLR(sc->sc_mcr, sc->sc_mcr_rts); 1411 CLR(sc->sc_mcr_active, sc->sc_mcr_rts); 1412 } else { 1413 SET(sc->sc_mcr, sc->sc_mcr_rts); 1414 SET(sc->sc_mcr_active, sc->sc_mcr_rts); 1415 } 1416 /* XXX device_unit() abuse */ 1417 sc->sc_set_mcr(sc->sc_set_mcr_arg, device_unit(&sc->sc_dev), 1418 sc->sc_mcr_active); 1419 } 1420 1421 1422 void 1423 plcomstart(struct tty *tp) 1424 { 1425 struct plcom_softc *sc = 1426 device_lookup_private(&plcom_cd, PLCOMUNIT(tp->t_dev)); 1427 bus_space_tag_t iot = sc->sc_iot; 1428 bus_space_handle_t ioh = sc->sc_ioh; 1429 int s; 1430 1431 if (PLCOM_ISALIVE(sc) == 0) 1432 return; 1433 1434 s = spltty(); 1435 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 1436 goto out; 1437 if (sc->sc_tx_stopped) 1438 goto out; 1439 1440 if (!ttypull(tp)) 1441 goto out; 1442 1443 /* Grab the first contiguous region of buffer space. */ 1444 { 1445 u_char *tba; 1446 int tbc; 1447 1448 tba = tp->t_outq.c_cf; 1449 tbc = ndqb(&tp->t_outq, 0); 1450 1451 (void)splserial(); 1452 PLCOM_LOCK(sc); 1453 1454 sc->sc_tba = tba; 1455 sc->sc_tbc = tbc; 1456 } 1457 1458 SET(tp->t_state, TS_BUSY); 1459 sc->sc_tx_busy = 1; 1460 1461 /* Enable transmit completion interrupts if necessary. */ 1462 if (!ISSET(sc->sc_cr, CR_TIE)) { 1463 SET(sc->sc_cr, CR_TIE); 1464 bus_space_write_1(iot, ioh, plcom_cr, sc->sc_cr); 1465 } 1466 1467 /* Output the first chunk of the contiguous buffer. */ 1468 { 1469 int n; 1470 1471 n = sc->sc_tbc; 1472 if (n > sc->sc_fifolen) 1473 n = sc->sc_fifolen; 1474 bus_space_write_multi_1(iot, ioh, plcom_dr, sc->sc_tba, n); 1475 sc->sc_tbc -= n; 1476 sc->sc_tba += n; 1477 } 1478 PLCOM_UNLOCK(sc); 1479 out: 1480 splx(s); 1481 return; 1482 } 1483 1484 /* 1485 * Stop output on a line. 1486 */ 1487 void 1488 plcomstop(struct tty *tp, int flag) 1489 { 1490 struct plcom_softc *sc = 1491 device_lookup_private(&plcom_cd, PLCOMUNIT(tp->t_dev)); 1492 int s; 1493 1494 s = splserial(); 1495 PLCOM_LOCK(sc); 1496 if (ISSET(tp->t_state, TS_BUSY)) { 1497 /* Stop transmitting at the next chunk. */ 1498 sc->sc_tbc = 0; 1499 sc->sc_heldtbc = 0; 1500 if (!ISSET(tp->t_state, TS_TTSTOP)) 1501 SET(tp->t_state, TS_FLUSH); 1502 } 1503 PLCOM_UNLOCK(sc); 1504 splx(s); 1505 } 1506 1507 void 1508 plcomdiag(void *arg) 1509 { 1510 struct plcom_softc *sc = arg; 1511 int overflows, floods; 1512 int s; 1513 1514 s = splserial(); 1515 PLCOM_LOCK(sc); 1516 overflows = sc->sc_overflows; 1517 sc->sc_overflows = 0; 1518 floods = sc->sc_floods; 1519 sc->sc_floods = 0; 1520 sc->sc_errors = 0; 1521 PLCOM_UNLOCK(sc); 1522 splx(s); 1523 1524 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1525 sc->sc_dev.dv_xname, 1526 overflows, overflows == 1 ? "" : "s", 1527 floods, floods == 1 ? "" : "s"); 1528 } 1529 1530 integrate void 1531 plcom_rxsoft(struct plcom_softc *sc, struct tty *tp) 1532 { 1533 int (*rint) (int, struct tty *) = tp->t_linesw->l_rint; 1534 u_char *get, *end; 1535 u_int cc, scc; 1536 u_char rsr; 1537 int code; 1538 int s; 1539 1540 end = sc->sc_ebuf; 1541 get = sc->sc_rbget; 1542 scc = cc = plcom_rbuf_size - sc->sc_rbavail; 1543 1544 if (cc == plcom_rbuf_size) { 1545 sc->sc_floods++; 1546 if (sc->sc_errors++ == 0) 1547 callout_reset(&sc->sc_diag_callout, 60 * hz, 1548 plcomdiag, sc); 1549 } 1550 1551 while (cc) { 1552 code = get[0]; 1553 rsr = get[1]; 1554 if (ISSET(rsr, RSR_OE | RSR_BE | RSR_FE | RSR_PE)) { 1555 if (ISSET(rsr, RSR_OE)) { 1556 sc->sc_overflows++; 1557 if (sc->sc_errors++ == 0) 1558 callout_reset(&sc->sc_diag_callout, 1559 60 * hz, plcomdiag, sc); 1560 } 1561 if (ISSET(rsr, RSR_BE | RSR_FE)) 1562 SET(code, TTY_FE); 1563 if (ISSET(rsr, RSR_PE)) 1564 SET(code, TTY_PE); 1565 } 1566 if ((*rint)(code, tp) == -1) { 1567 /* 1568 * The line discipline's buffer is out of space. 1569 */ 1570 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1571 /* 1572 * We're either not using flow control, or the 1573 * line discipline didn't tell us to block for 1574 * some reason. Either way, we have no way to 1575 * know when there's more space available, so 1576 * just drop the rest of the data. 1577 */ 1578 get += cc << 1; 1579 if (get >= end) 1580 get -= plcom_rbuf_size << 1; 1581 cc = 0; 1582 } else { 1583 /* 1584 * Don't schedule any more receive processing 1585 * until the line discipline tells us there's 1586 * space available (through plcomhwiflow()). 1587 * Leave the rest of the data in the input 1588 * buffer. 1589 */ 1590 SET(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1591 } 1592 break; 1593 } 1594 get += 2; 1595 if (get >= end) 1596 get = sc->sc_rbuf; 1597 cc--; 1598 } 1599 1600 if (cc != scc) { 1601 sc->sc_rbget = get; 1602 s = splserial(); 1603 PLCOM_LOCK(sc); 1604 1605 cc = sc->sc_rbavail += scc - cc; 1606 /* Buffers should be ok again, release possible block. */ 1607 if (cc >= sc->sc_r_lowat) { 1608 if (ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1609 CLR(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1610 SET(sc->sc_cr, CR_RIE | CR_RTIE); 1611 bus_space_write_1(sc->sc_iot, sc->sc_ioh, plcom_cr, sc->sc_cr); 1612 } 1613 if (ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED)) { 1614 CLR(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1615 plcom_hwiflow(sc); 1616 } 1617 } 1618 PLCOM_UNLOCK(sc); 1619 splx(s); 1620 } 1621 } 1622 1623 integrate void 1624 plcom_txsoft(struct plcom_softc *sc, struct tty *tp) 1625 { 1626 1627 CLR(tp->t_state, TS_BUSY); 1628 if (ISSET(tp->t_state, TS_FLUSH)) 1629 CLR(tp->t_state, TS_FLUSH); 1630 else 1631 ndflush(&tp->t_outq, (int)(sc->sc_tba - tp->t_outq.c_cf)); 1632 (*tp->t_linesw->l_start)(tp); 1633 } 1634 1635 integrate void 1636 plcom_stsoft(struct plcom_softc *sc, struct tty *tp) 1637 { 1638 u_char msr, delta; 1639 int s; 1640 1641 s = splserial(); 1642 PLCOM_LOCK(sc); 1643 msr = sc->sc_msr; 1644 delta = sc->sc_msr_delta; 1645 sc->sc_msr_delta = 0; 1646 PLCOM_UNLOCK(sc); 1647 splx(s); 1648 1649 if (ISSET(delta, sc->sc_msr_dcd)) { 1650 /* 1651 * Inform the tty layer that carrier detect changed. 1652 */ 1653 (void) (*tp->t_linesw->l_modem)(tp, ISSET(msr, MSR_DCD)); 1654 } 1655 1656 if (ISSET(delta, sc->sc_msr_cts)) { 1657 /* Block or unblock output according to flow control. */ 1658 if (ISSET(msr, sc->sc_msr_cts)) { 1659 sc->sc_tx_stopped = 0; 1660 (*tp->t_linesw->l_start)(tp); 1661 } else { 1662 sc->sc_tx_stopped = 1; 1663 } 1664 } 1665 1666 #ifdef PLCOM_DEBUG 1667 if (plcom_debug) 1668 plcomstatus(sc, "plcom_stsoft"); 1669 #endif 1670 } 1671 1672 void 1673 plcomsoft(void *arg) 1674 { 1675 struct plcom_softc *sc = arg; 1676 struct tty *tp; 1677 1678 if (PLCOM_ISALIVE(sc) == 0) 1679 return; 1680 1681 tp = sc->sc_tty; 1682 1683 if (sc->sc_rx_ready) { 1684 sc->sc_rx_ready = 0; 1685 plcom_rxsoft(sc, tp); 1686 } 1687 1688 if (sc->sc_st_check) { 1689 sc->sc_st_check = 0; 1690 plcom_stsoft(sc, tp); 1691 } 1692 1693 if (sc->sc_tx_done) { 1694 sc->sc_tx_done = 0; 1695 plcom_txsoft(sc, tp); 1696 } 1697 } 1698 1699 int 1700 plcomintr(void *arg) 1701 { 1702 struct plcom_softc *sc = arg; 1703 bus_space_tag_t iot = sc->sc_iot; 1704 bus_space_handle_t ioh = sc->sc_ioh; 1705 u_char *put, *end; 1706 u_int cc; 1707 u_char rsr, iir; 1708 1709 if (PLCOM_ISALIVE(sc) == 0) 1710 return 0; 1711 1712 PLCOM_LOCK(sc); 1713 iir = bus_space_read_1(iot, ioh, plcom_iir); 1714 if (! ISSET(iir, IIR_IMASK)) { 1715 PLCOM_UNLOCK(sc); 1716 return 0; 1717 } 1718 1719 end = sc->sc_ebuf; 1720 put = sc->sc_rbput; 1721 cc = sc->sc_rbavail; 1722 1723 do { 1724 u_char msr, delta, fr; 1725 1726 fr = bus_space_read_1(iot, ioh, plcom_fr); 1727 1728 if (!ISSET(fr, FR_RXFE) && 1729 !ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1730 while (cc > 0) { 1731 int cn_trapped = 0; 1732 put[0] = bus_space_read_1(iot, ioh, 1733 plcom_dr); 1734 rsr = bus_space_read_1(iot, ioh, plcom_rsr); 1735 /* Clear any error status. */ 1736 if (ISSET(rsr, 1737 (RSR_BE | RSR_OE | RSR_PE | RSR_FE))) 1738 bus_space_write_1(iot, ioh, plcom_ecr, 1739 0); 1740 if (ISSET(rsr, RSR_BE)) { 1741 cn_trapped = 0; 1742 cn_check_magic(sc->sc_tty->t_dev, 1743 CNC_BREAK, plcom_cnm_state); 1744 if (cn_trapped) 1745 continue; 1746 #if defined(KGDB) 1747 if (ISSET(sc->sc_hwflags, 1748 PLCOM_HW_KGDB)) { 1749 kgdb_connect(1); 1750 continue; 1751 } 1752 #endif 1753 } 1754 1755 put[1] = rsr; 1756 cn_trapped = 0; 1757 cn_check_magic(sc->sc_tty->t_dev, 1758 put[0], plcom_cnm_state); 1759 if (cn_trapped) { 1760 fr = bus_space_read_1(iot, ioh, 1761 plcom_fr); 1762 if (ISSET(fr, FR_RXFE)) 1763 break; 1764 1765 continue; 1766 } 1767 put += 2; 1768 if (put >= end) 1769 put = sc->sc_rbuf; 1770 cc--; 1771 1772 fr = bus_space_read_1(iot, ioh, plcom_fr); 1773 if (ISSET(fr, FR_RXFE)) 1774 break; 1775 } 1776 1777 /* 1778 * Current string of incoming characters ended because 1779 * no more data was available or we ran out of space. 1780 * Schedule a receive event if any data was received. 1781 * If we're out of space, turn off receive interrupts. 1782 */ 1783 sc->sc_rbput = put; 1784 sc->sc_rbavail = cc; 1785 if (!ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) 1786 sc->sc_rx_ready = 1; 1787 1788 /* 1789 * See if we are in danger of overflowing a buffer. If 1790 * so, use hardware flow control to ease the pressure. 1791 */ 1792 if (!ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED) && 1793 cc < sc->sc_r_hiwat) { 1794 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1795 plcom_hwiflow(sc); 1796 } 1797 1798 /* 1799 * If we're out of space, disable receive interrupts 1800 * until the queue has drained a bit. 1801 */ 1802 if (!cc) { 1803 SET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1804 CLR(sc->sc_cr, CR_RIE | CR_RTIE); 1805 bus_space_write_1(iot, ioh, plcom_cr, 1806 sc->sc_cr); 1807 } 1808 } else { 1809 if (ISSET(iir, IIR_RIS)) { 1810 bus_space_write_1(iot, ioh, plcom_cr, 0); 1811 delay(10); 1812 bus_space_write_1(iot, ioh, plcom_cr, 1813 sc->sc_cr); 1814 continue; 1815 } 1816 } 1817 1818 msr = bus_space_read_1(iot, ioh, plcom_fr); 1819 delta = msr ^ sc->sc_msr; 1820 sc->sc_msr = msr; 1821 /* Clear any pending modem status interrupt. */ 1822 if (iir & IIR_MIS) 1823 bus_space_write_1(iot, ioh, plcom_icr, 0); 1824 /* 1825 * Pulse-per-second (PSS) signals on edge of DCD? 1826 * Process these even if line discipline is ignoring DCD. 1827 */ 1828 if (delta & sc->sc_ppsmask) { 1829 struct timeval tv; 1830 mutex_spin_enter(&timecounter_lock); 1831 if ((msr & sc->sc_ppsmask) == sc->sc_ppsassert) { 1832 /* XXX nanotime() */ 1833 microtime(&tv); 1834 TIMEVAL_TO_TIMESPEC(&tv, 1835 &sc->ppsinfo.assert_timestamp); 1836 if (sc->ppsparam.mode & PPS_OFFSETASSERT) { 1837 timespecadd(&sc->ppsinfo.assert_timestamp, 1838 &sc->ppsparam.assert_offset, 1839 &sc->ppsinfo.assert_timestamp); 1840 } 1841 1842 #ifdef PPS_SYNC 1843 if (sc->ppsparam.mode & PPS_HARDPPSONASSERT) 1844 hardpps(&tv, tv.tv_usec); 1845 #endif 1846 sc->ppsinfo.assert_sequence++; 1847 sc->ppsinfo.current_mode = sc->ppsparam.mode; 1848 1849 } else if ((msr & sc->sc_ppsmask) == sc->sc_ppsclear) { 1850 /* XXX nanotime() */ 1851 microtime(&tv); 1852 TIMEVAL_TO_TIMESPEC(&tv, 1853 &sc->ppsinfo.clear_timestamp); 1854 if (sc->ppsparam.mode & PPS_OFFSETCLEAR) { 1855 timespecadd(&sc->ppsinfo.clear_timestamp, 1856 &sc->ppsparam.clear_offset, 1857 &sc->ppsinfo.clear_timestamp); 1858 } 1859 1860 #ifdef PPS_SYNC 1861 if (sc->ppsparam.mode & PPS_HARDPPSONCLEAR) 1862 hardpps(&tv, tv.tv_usec); 1863 #endif 1864 sc->ppsinfo.clear_sequence++; 1865 sc->ppsinfo.current_mode = sc->ppsparam.mode; 1866 } 1867 mutex_spin_exit(&timecounter_lock); 1868 } 1869 1870 /* 1871 * Process normal status changes 1872 */ 1873 if (ISSET(delta, sc->sc_msr_mask)) { 1874 SET(sc->sc_msr_delta, delta); 1875 1876 /* 1877 * Stop output immediately if we lose the output 1878 * flow control signal or carrier detect. 1879 */ 1880 if (ISSET(~msr, sc->sc_msr_mask)) { 1881 sc->sc_tbc = 0; 1882 sc->sc_heldtbc = 0; 1883 #ifdef PLCOM_DEBUG 1884 if (plcom_debug) 1885 plcomstatus(sc, "plcomintr "); 1886 #endif 1887 } 1888 1889 sc->sc_st_check = 1; 1890 } 1891 1892 /* 1893 * Done handling any receive interrupts. See if data 1894 * can be * transmitted as well. Schedule tx done 1895 * event if no data left * and tty was marked busy. 1896 */ 1897 if (ISSET(iir, IIR_TIS)) { 1898 /* 1899 * If we've delayed a parameter change, do it 1900 * now, and restart * output. 1901 */ 1902 if (sc->sc_heldchange) { 1903 plcom_loadchannelregs(sc); 1904 sc->sc_heldchange = 0; 1905 sc->sc_tbc = sc->sc_heldtbc; 1906 sc->sc_heldtbc = 0; 1907 } 1908 1909 /* 1910 * Output the next chunk of the contiguous 1911 * buffer, if any. 1912 */ 1913 if (sc->sc_tbc > 0) { 1914 int n; 1915 1916 n = sc->sc_tbc; 1917 if (n > sc->sc_fifolen) 1918 n = sc->sc_fifolen; 1919 bus_space_write_multi_1(iot, ioh, plcom_dr, 1920 sc->sc_tba, n); 1921 sc->sc_tbc -= n; 1922 sc->sc_tba += n; 1923 } else { 1924 /* 1925 * Disable transmit plcompletion 1926 * interrupts if necessary. 1927 */ 1928 if (ISSET(sc->sc_cr, CR_TIE)) { 1929 CLR(sc->sc_cr, CR_TIE); 1930 bus_space_write_1(iot, ioh, plcom_cr, 1931 sc->sc_cr); 1932 } 1933 if (sc->sc_tx_busy) { 1934 sc->sc_tx_busy = 0; 1935 sc->sc_tx_done = 1; 1936 } 1937 } 1938 } 1939 } while (ISSET((iir = bus_space_read_1(iot, ioh, plcom_iir)), 1940 IIR_IMASK)); 1941 1942 PLCOM_UNLOCK(sc); 1943 1944 /* Wake up the poller. */ 1945 softint_schedule(sc->sc_si); 1946 1947 #if NRND > 0 && defined(RND_COM) 1948 rnd_add_uint32(&sc->rnd_source, iir | rsr); 1949 #endif 1950 1951 return 1; 1952 } 1953 1954 /* 1955 * The following functions are polled getc and putc routines, shared 1956 * by the console and kgdb glue. 1957 * 1958 * The read-ahead code is so that you can detect pending in-band 1959 * cn_magic in polled mode while doing output rather than having to 1960 * wait until the kernel decides it needs input. 1961 */ 1962 1963 #define MAX_READAHEAD 20 1964 static int plcom_readahead[MAX_READAHEAD]; 1965 static int plcom_readaheadcount = 0; 1966 1967 int 1968 plcom_common_getc(dev_t dev, bus_space_tag_t iot, bus_space_handle_t ioh) 1969 { 1970 int s = splserial(); 1971 u_char stat, c; 1972 1973 /* got a character from reading things earlier */ 1974 if (plcom_readaheadcount > 0) { 1975 int i; 1976 1977 c = plcom_readahead[0]; 1978 for (i = 1; i < plcom_readaheadcount; i++) { 1979 plcom_readahead[i-1] = plcom_readahead[i]; 1980 } 1981 plcom_readaheadcount--; 1982 splx(s); 1983 return c; 1984 } 1985 1986 /* block until a character becomes available */ 1987 while (ISSET(stat = bus_space_read_1(iot, ioh, plcom_fr), FR_RXFE)) 1988 ; 1989 1990 c = bus_space_read_1(iot, ioh, plcom_dr); 1991 stat = bus_space_read_1(iot, ioh, plcom_iir); 1992 { 1993 int cn_trapped = 0; /* unused */ 1994 #ifdef DDB 1995 extern int db_active; 1996 if (!db_active) 1997 #endif 1998 cn_check_magic(dev, c, plcom_cnm_state); 1999 } 2000 splx(s); 2001 return c; 2002 } 2003 2004 void 2005 plcom_common_putc(dev_t dev, bus_space_tag_t iot, bus_space_handle_t ioh, 2006 int c) 2007 { 2008 int s = splserial(); 2009 int timo; 2010 2011 int cin, stat; 2012 if (plcom_readaheadcount < MAX_READAHEAD 2013 && !ISSET(stat = bus_space_read_1(iot, ioh, plcom_fr), FR_RXFE)) { 2014 int cn_trapped = 0; 2015 cin = bus_space_read_1(iot, ioh, plcom_dr); 2016 stat = bus_space_read_1(iot, ioh, plcom_iir); 2017 cn_check_magic(dev, cin, plcom_cnm_state); 2018 plcom_readahead[plcom_readaheadcount++] = cin; 2019 } 2020 2021 /* wait for any pending transmission to finish */ 2022 timo = 150000; 2023 while (!ISSET(bus_space_read_1(iot, ioh, plcom_fr), FR_TXFE) && --timo) 2024 continue; 2025 2026 bus_space_write_1(iot, ioh, plcom_dr, c); 2027 PLCOM_BARRIER(iot, ioh, BR | BW); 2028 2029 /* wait for this transmission to complete */ 2030 timo = 1500000; 2031 while (!ISSET(bus_space_read_1(iot, ioh, plcom_fr), FR_TXFE) && --timo) 2032 continue; 2033 2034 splx(s); 2035 } 2036 2037 /* 2038 * Initialize UART for use as console or KGDB line. 2039 */ 2040 int 2041 plcominit(bus_space_tag_t iot, bus_addr_t iobase, int rate, int frequency, 2042 tcflag_t cflag, bus_space_handle_t *iohp) 2043 { 2044 bus_space_handle_t ioh; 2045 2046 if (bus_space_map(iot, iobase, PLCOM_UART_SIZE, 0, &ioh)) 2047 return ENOMEM; /* ??? */ 2048 2049 rate = plcomspeed(rate, frequency); 2050 bus_space_write_1(iot, ioh, plcom_cr, 0); 2051 bus_space_write_1(iot, ioh, plcom_dlbl, rate); 2052 bus_space_write_1(iot, ioh, plcom_dlbh, rate >> 8); 2053 bus_space_write_1(iot, ioh, plcom_lcr, cflag2lcr(cflag) | LCR_FEN); 2054 bus_space_write_1(iot, ioh, plcom_cr, CR_UARTEN); 2055 2056 #if 0 2057 /* Ought to do something like this, but we have no sc to 2058 dereference. */ 2059 /* XXX device_unit() abuse */ 2060 sc->sc_set_mcr(sc->sc_set_mcr_arg, device_unit(&sc->sc_dev), 2061 MCR_DTR | MCR_RTS); 2062 #endif 2063 2064 *iohp = ioh; 2065 return 0; 2066 } 2067 2068 /* 2069 * Following are all routines needed for PLCOM to act as console 2070 */ 2071 struct consdev plcomcons = { 2072 NULL, NULL, plcomcngetc, plcomcnputc, plcomcnpollc, NULL, 2073 NULL, NULL, NODEV, CN_NORMAL 2074 }; 2075 2076 2077 int 2078 plcomcnattach(bus_space_tag_t iot, bus_addr_t iobase, int rate, int frequency, 2079 tcflag_t cflag, int unit) 2080 { 2081 int res; 2082 2083 res = plcominit(iot, iobase, rate, frequency, cflag, &plcomconsioh); 2084 if (res) 2085 return res; 2086 2087 cn_tab = &plcomcons; 2088 cn_init_magic(&plcom_cnm_state); 2089 cn_set_magic("\047\001"); /* default magic is BREAK */ 2090 2091 plcomconstag = iot; 2092 plcomconsunit = unit; 2093 plcomconsrate = rate; 2094 plcomconscflag = cflag; 2095 2096 return 0; 2097 } 2098 2099 void 2100 plcomcndetach(void) 2101 { 2102 bus_space_unmap(plcomconstag, plcomconsioh, PLCOM_UART_SIZE); 2103 plcomconstag = NULL; 2104 2105 cn_tab = NULL; 2106 } 2107 2108 int 2109 plcomcngetc(dev_t dev) 2110 { 2111 return plcom_common_getc(dev, plcomconstag, plcomconsioh); 2112 } 2113 2114 /* 2115 * Console kernel output character routine. 2116 */ 2117 void 2118 plcomcnputc(dev_t dev, int c) 2119 { 2120 plcom_common_putc(dev, plcomconstag, plcomconsioh, c); 2121 } 2122 2123 void 2124 plcomcnpollc(dev_t dev, int on) 2125 { 2126 2127 } 2128 2129 #ifdef KGDB 2130 int 2131 plcom_kgdb_attach(bus_space_tag_t iot, bus_addr_t iobase, int rate, 2132 int frequency, tcflag_t cflag, int unit) 2133 { 2134 int res; 2135 2136 if (iot == plcomconstag && iobase == plcomconsunit) 2137 return EBUSY; /* cannot share with console */ 2138 2139 res = plcominit(iot, iobase, rate, frequency, cflag, &plcom_kgdb_ioh); 2140 if (res) 2141 return res; 2142 2143 kgdb_attach(plcom_kgdb_getc, plcom_kgdb_putc, NULL); 2144 kgdb_dev = 123; /* unneeded, only to satisfy some tests */ 2145 2146 plcom_kgdb_iot = iot; 2147 plcom_kgdb_unit = unit; 2148 2149 return 0; 2150 } 2151 2152 /* ARGSUSED */ 2153 int 2154 plcom_kgdb_getc(void *arg) 2155 { 2156 return plcom_common_getc(NODEV, plcom_kgdb_iot, plcom_kgdb_ioh); 2157 } 2158 2159 /* ARGSUSED */ 2160 void 2161 plcom_kgdb_putc(void *arg, int c) 2162 { 2163 plcom_common_putc(NODEV, plcom_kgdb_iot, plcom_kgdb_ioh, c); 2164 } 2165 #endif /* KGDB */ 2166 2167 /* helper function to identify the plcom ports used by 2168 console or KGDB (and not yet autoconf attached) */ 2169 int 2170 plcom_is_console(bus_space_tag_t iot, int unit, 2171 bus_space_handle_t *ioh) 2172 { 2173 bus_space_handle_t help; 2174 2175 if (!plcomconsattached && 2176 iot == plcomconstag && unit == plcomconsunit) 2177 help = plcomconsioh; 2178 #ifdef KGDB 2179 else if (!plcom_kgdb_attached && 2180 iot == plcom_kgdb_iot && unit == plcom_kgdb_unit) 2181 help = plcom_kgdb_ioh; 2182 #endif 2183 else 2184 return 0; 2185 2186 if (ioh) 2187 *ioh = help; 2188 return 1; 2189 } 2190
Indexes created Fri Oct 17 23:09:53 GMT 2025