plcom.c revision 1.8
1 /* $NetBSD: plcom.c,v 1.8 2003/07/15 00:24:57 lukem 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. All advertising materials mentioning features or use of this software 79 * must display the following acknowledgement: 80 * This product includes software developed by the University of 81 * California, Berkeley and its contributors. 82 * 4. Neither the name of the University nor the names of its contributors 83 * may be used to endorse or promote products derived from this software 84 * without specific prior written permission. 85 * 86 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 87 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 88 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 89 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 90 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 91 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 92 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 93 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 94 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 95 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 96 * SUCH DAMAGE. 97 * 98 * @(#)com.c 7.5 (Berkeley) 5/16/91 99 */ 100 101 /* 102 * COM driver for the Prime Cell PL010 UART, which is similar to the 16C550, 103 * but has a completely different programmer's model. 104 * Derived from the NS16550AF com driver. 105 */ 106 107 #include <sys/cdefs.h> 108 __KERNEL_RCSID(0, "$NetBSD: plcom.c,v 1.8 2003/07/15 00:24:57 lukem Exp $"); 109 110 #include "opt_plcom.h" 111 #include "opt_ddb.h" 112 #include "opt_kgdb.h" 113 #include "opt_lockdebug.h" 114 #include "opt_multiprocessor.h" 115 116 #include "rnd.h" 117 #if NRND > 0 && defined(RND_COM) 118 #include <sys/rnd.h> 119 #endif 120 121 /* 122 * Override cnmagic(9) macro before including <sys/systm.h>. 123 * We need to know if cn_check_magic triggered debugger, so set a flag. 124 * Callers of cn_check_magic must declare int cn_trapped = 0; 125 * XXX: this is *ugly*! 126 */ 127 #define cn_trap() \ 128 do { \ 129 console_debugger(); \ 130 cn_trapped = 1; \ 131 } while (/* CONSTCOND */ 0) 132 133 #include <sys/param.h> 134 #include <sys/systm.h> 135 #include <sys/ioctl.h> 136 #include <sys/select.h> 137 #include <sys/tty.h> 138 #include <sys/proc.h> 139 #include <sys/user.h> 140 #include <sys/conf.h> 141 #include <sys/file.h> 142 #include <sys/uio.h> 143 #include <sys/kernel.h> 144 #include <sys/syslog.h> 145 #include <sys/types.h> 146 #include <sys/device.h> 147 #include <sys/malloc.h> 148 #include <sys/timepps.h> 149 #include <sys/vnode.h> 150 151 #include <machine/intr.h> 152 #include <machine/bus.h> 153 154 #include <evbarm/dev/plcomreg.h> 155 #include <evbarm/dev/plcomvar.h> 156 157 #include <dev/cons.h> 158 159 static void plcom_enable_debugport (struct plcom_softc *); 160 161 void plcom_config (struct plcom_softc *); 162 void plcom_shutdown (struct plcom_softc *); 163 int plcomspeed (long, long); 164 static u_char cflag2lcr (tcflag_t); 165 int plcomparam (struct tty *, struct termios *); 166 void plcomstart (struct tty *); 167 int plcomhwiflow (struct tty *, int); 168 169 void plcom_loadchannelregs (struct plcom_softc *); 170 void plcom_hwiflow (struct plcom_softc *); 171 void plcom_break (struct plcom_softc *, int); 172 void plcom_modem (struct plcom_softc *, int); 173 void tiocm_to_plcom (struct plcom_softc *, u_long, int); 174 int plcom_to_tiocm (struct plcom_softc *); 175 void plcom_iflush (struct plcom_softc *); 176 177 int plcom_common_getc (dev_t, bus_space_tag_t, bus_space_handle_t); 178 void plcom_common_putc (dev_t, bus_space_tag_t, bus_space_handle_t, int); 179 180 int plcominit (bus_space_tag_t, bus_addr_t, int, int, tcflag_t, 181 bus_space_handle_t *); 182 183 dev_type_open(plcomopen); 184 dev_type_close(plcomclose); 185 dev_type_read(plcomread); 186 dev_type_write(plcomwrite); 187 dev_type_ioctl(plcomioctl); 188 dev_type_stop(plcomstop); 189 dev_type_tty(plcomtty); 190 dev_type_poll(plcompoll); 191 192 int plcomcngetc (dev_t); 193 void plcomcnputc (dev_t, int); 194 void plcomcnpollc (dev_t, int); 195 196 #define integrate static inline 197 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 198 void plcomsoft (void *); 199 #else 200 #ifndef __NO_SOFT_SERIAL_INTERRUPT 201 void plcomsoft (void); 202 #else 203 void plcomsoft (void *); 204 struct callout plcomsoft_callout = CALLOUT_INITIALIZER; 205 #endif 206 #endif 207 integrate void plcom_rxsoft (struct plcom_softc *, struct tty *); 208 integrate void plcom_txsoft (struct plcom_softc *, struct tty *); 209 integrate void plcom_stsoft (struct plcom_softc *, struct tty *); 210 integrate void plcom_schedrx (struct plcom_softc *); 211 void plcomdiag (void *); 212 213 extern struct cfdriver plcom_cd; 214 215 const struct cdevsw plcom_cdevsw = { 216 plcomopen, plcomclose, plcomread, plcomwrite, plcomioctl, 217 plcomstop, plcomtty, plcompoll, nommap, ttykqfilter, D_TTY 218 }; 219 220 /* 221 * Make this an option variable one can patch. 222 * But be warned: this must be a power of 2! 223 */ 224 u_int plcom_rbuf_size = PLCOM_RING_SIZE; 225 226 /* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */ 227 u_int plcom_rbuf_hiwat = (PLCOM_RING_SIZE * 1) / 4; 228 u_int plcom_rbuf_lowat = (PLCOM_RING_SIZE * 3) / 4; 229 230 static int plcomconsunit = -1; 231 static bus_space_tag_t plcomconstag; 232 static bus_space_handle_t plcomconsioh; 233 static int plcomconsattached; 234 static int plcomconsrate; 235 static tcflag_t plcomconscflag; 236 static struct cnm_state plcom_cnm_state; 237 238 static int ppscap = 239 PPS_TSFMT_TSPEC | 240 PPS_CAPTUREASSERT | 241 PPS_CAPTURECLEAR | 242 #ifdef PPS_SYNC 243 PPS_HARDPPSONASSERT | PPS_HARDPPSONCLEAR | 244 #endif /* PPS_SYNC */ 245 PPS_OFFSETASSERT | PPS_OFFSETCLEAR; 246 247 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS 248 #ifdef __NO_SOFT_SERIAL_INTERRUPT 249 volatile int plcom_softintr_scheduled; 250 #endif 251 #endif 252 253 #ifdef KGDB 254 #include <sys/kgdb.h> 255 256 static int plcom_kgdb_unit; 257 static bus_space_tag_t plcom_kgdb_iot; 258 static bus_space_handle_t plcom_kgdb_ioh; 259 static int plcom_kgdb_attached; 260 261 int plcom_kgdb_getc (void *); 262 void plcom_kgdb_putc (void *, int); 263 #endif /* KGDB */ 264 265 #define PLCOMUNIT_MASK 0x7ffff 266 #define PLCOMDIALOUT_MASK 0x80000 267 268 #define PLCOMUNIT(x) (minor(x) & PLCOMUNIT_MASK) 269 #define PLCOMDIALOUT(x) (minor(x) & PLCOMDIALOUT_MASK) 270 271 #define PLCOM_ISALIVE(sc) ((sc)->enabled != 0 && \ 272 ISSET((sc)->sc_dev.dv_flags, DVF_ACTIVE)) 273 274 #define BR BUS_SPACE_BARRIER_READ 275 #define BW BUS_SPACE_BARRIER_WRITE 276 #define PLCOM_BARRIER(t, h, f) bus_space_barrier((t), (h), 0, PLCOM_UART_SIZE, (f)) 277 278 #if (defined(MULTIPROCESSOR) || defined(LOCKDEBUG)) && defined(PLCOM_MPLOCK) 279 280 #define PLCOM_LOCK(sc) simple_lock(&(sc)->sc_lock) 281 #define PLCOM_UNLOCK(sc) simple_unlock(&(sc)->sc_lock) 282 283 #else 284 285 #define PLCOM_LOCK(sc) 286 #define PLCOM_UNLOCK(sc) 287 288 #endif 289 290 int 291 plcomspeed(long speed, long frequency) 292 { 293 #define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */ 294 295 int x, err; 296 297 #if 0 298 if (speed == 0) 299 return 0; 300 #endif 301 if (speed <= 0) 302 return -1; 303 x = divrnd(frequency / 16, speed); 304 if (x <= 0) 305 return -1; 306 err = divrnd(((quad_t)frequency) * 1000 / 16, speed * x) - 1000; 307 if (err < 0) 308 err = -err; 309 if (err > PLCOM_TOLERANCE) 310 return -1; 311 return x; 312 313 #undef divrnd 314 } 315 316 #ifdef PLCOM_DEBUG 317 int plcom_debug = 0; 318 319 void plcomstatus (struct plcom_softc *, char *); 320 void 321 plcomstatus(struct plcom_softc *sc, char *str) 322 { 323 struct tty *tp = sc->sc_tty; 324 325 printf("%s: %s %sclocal %sdcd %sts_carr_on %sdtr %stx_stopped\n", 326 sc->sc_dev.dv_xname, str, 327 ISSET(tp->t_cflag, CLOCAL) ? "+" : "-", 328 ISSET(sc->sc_msr, MSR_DCD) ? "+" : "-", 329 ISSET(tp->t_state, TS_CARR_ON) ? "+" : "-", 330 ISSET(sc->sc_mcr, MCR_DTR) ? "+" : "-", 331 sc->sc_tx_stopped ? "+" : "-"); 332 333 printf("%s: %s %scrtscts %scts %sts_ttstop %srts %xrx_flags\n", 334 sc->sc_dev.dv_xname, str, 335 ISSET(tp->t_cflag, CRTSCTS) ? "+" : "-", 336 ISSET(sc->sc_msr, MSR_CTS) ? "+" : "-", 337 ISSET(tp->t_state, TS_TTSTOP) ? "+" : "-", 338 ISSET(sc->sc_mcr, MCR_RTS) ? "+" : "-", 339 sc->sc_rx_flags); 340 } 341 #endif 342 343 int 344 plcomprobe1(bus_space_tag_t iot, bus_space_handle_t ioh) 345 { 346 int data; 347 348 /* Disable the UART. */ 349 bus_space_write_1(iot, ioh, plcom_cr, 0); 350 /* Make sure the FIFO is off. */ 351 bus_space_write_1(iot, ioh, plcom_lcr, LCR_8BITS); 352 /* Disable interrupts. */ 353 bus_space_write_1(iot, ioh, plcom_iir, 0); 354 355 /* Make sure we swallow anything in the receiving register. */ 356 data = bus_space_read_1(iot, ioh, plcom_dr); 357 358 if (bus_space_read_1(iot, ioh, plcom_lcr) != LCR_8BITS) 359 return 0; 360 361 data = bus_space_read_1(iot, ioh, plcom_fr) & (FR_RXFF | FR_RXFE); 362 363 if (data != FR_RXFE) 364 return 0; 365 366 return 1; 367 } 368 369 static void 370 plcom_enable_debugport(struct plcom_softc *sc) 371 { 372 int s; 373 374 /* Turn on line break interrupt, set carrier. */ 375 s = splserial(); 376 PLCOM_LOCK(sc); 377 sc->sc_cr = CR_RIE | CR_RTIE | CR_UARTEN; 378 bus_space_write_1(sc->sc_iot, sc->sc_ioh, plcom_cr, sc->sc_cr); 379 SET(sc->sc_mcr, MCR_DTR | MCR_RTS); 380 sc->sc_set_mcr(sc->sc_set_mcr_arg, sc->sc_dev.dv_unit, sc->sc_mcr); 381 PLCOM_UNLOCK(sc); 382 splx(s); 383 } 384 385 void 386 plcom_attach_subr(struct plcom_softc *sc) 387 { 388 int unit = sc->sc_iounit; 389 bus_space_tag_t iot = sc->sc_iot; 390 bus_space_handle_t ioh = sc->sc_ioh; 391 struct tty *tp; 392 393 callout_init(&sc->sc_diag_callout); 394 #if (defined(MULTIPROCESSOR) || defined(LOCKDEBUG)) && defined(PLCOM_MPLOCK) 395 simple_lock_init(&sc->sc_lock); 396 #endif 397 398 /* Disable interrupts before configuring the device. */ 399 sc->sc_cr = 0; 400 401 if (plcomconstag && unit == plcomconsunit) { 402 plcomconsattached = 1; 403 404 plcomconstag = iot; 405 plcomconsioh = ioh; 406 407 /* Make sure the console is always "hardwired". */ 408 delay(1000); /* wait for output to finish */ 409 SET(sc->sc_hwflags, PLCOM_HW_CONSOLE); 410 SET(sc->sc_swflags, TIOCFLAG_SOFTCAR); 411 /* Must re-enable the console immediately, or we will 412 hang when trying to print. */ 413 sc->sc_cr = CR_UARTEN; 414 } 415 416 bus_space_write_1(iot, ioh, plcom_cr, sc->sc_cr); 417 418 /* The PL010 has a 16-byte fifo, but the tx interrupt triggers when 419 there is space for 8 more bytes. */ 420 sc->sc_fifolen = 8; 421 printf("\n"); 422 423 if (ISSET(sc->sc_hwflags, PLCOM_HW_TXFIFO_DISABLE)) { 424 sc->sc_fifolen = 1; 425 printf("%s: txfifo disabled\n", sc->sc_dev.dv_xname); 426 } 427 428 if (sc->sc_fifolen > 1) 429 SET(sc->sc_hwflags, PLCOM_HW_FIFO); 430 431 tp = ttymalloc(); 432 tp->t_oproc = plcomstart; 433 tp->t_param = plcomparam; 434 tp->t_hwiflow = plcomhwiflow; 435 436 sc->sc_tty = tp; 437 sc->sc_rbuf = malloc(plcom_rbuf_size << 1, M_DEVBUF, M_NOWAIT); 438 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 439 sc->sc_rbavail = plcom_rbuf_size; 440 if (sc->sc_rbuf == NULL) { 441 printf("%s: unable to allocate ring buffer\n", 442 sc->sc_dev.dv_xname); 443 return; 444 } 445 sc->sc_ebuf = sc->sc_rbuf + (plcom_rbuf_size << 1); 446 447 tty_attach(tp); 448 449 if (ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE)) { 450 int maj; 451 452 /* locate the major number */ 453 maj = cdevsw_lookup_major(&plcom_cdevsw); 454 455 cn_tab->cn_dev = makedev(maj, sc->sc_dev.dv_unit); 456 457 printf("%s: console\n", sc->sc_dev.dv_xname); 458 } 459 460 #ifdef KGDB 461 /* 462 * Allow kgdb to "take over" this port. If this is 463 * the kgdb device, it has exclusive use. 464 */ 465 if (iot == plcom_kgdb_iot && unit == plcom_kgdb_unit) { 466 plcom_kgdb_attached = 1; 467 468 SET(sc->sc_hwflags, PLCOM_HW_KGDB); 469 printf("%s: kgdb\n", sc->sc_dev.dv_xname); 470 } 471 #endif 472 473 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 474 sc->sc_si = softintr_establish(IPL_SOFTSERIAL, plcomsoft, sc); 475 #endif 476 477 #if NRND > 0 && defined(RND_COM) 478 rnd_attach_source(&sc->rnd_source, sc->sc_dev.dv_xname, 479 RND_TYPE_TTY, 0); 480 #endif 481 482 /* if there are no enable/disable functions, assume the device 483 is always enabled */ 484 if (!sc->enable) 485 sc->enabled = 1; 486 487 plcom_config(sc); 488 489 SET(sc->sc_hwflags, PLCOM_HW_DEV_OK); 490 } 491 492 void 493 plcom_config(struct plcom_softc *sc) 494 { 495 bus_space_tag_t iot = sc->sc_iot; 496 bus_space_handle_t ioh = sc->sc_ioh; 497 498 /* Disable interrupts before configuring the device. */ 499 sc->sc_cr = 0; 500 bus_space_write_1(iot, ioh, plcom_cr, sc->sc_cr); 501 502 if (ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE|PLCOM_HW_KGDB)) 503 plcom_enable_debugport(sc); 504 } 505 506 int 507 plcom_detach(self, flags) 508 struct device *self; 509 int flags; 510 { 511 struct plcom_softc *sc = (struct plcom_softc *)self; 512 int maj, mn; 513 514 /* locate the major number */ 515 maj = cdevsw_lookup_major(&plcom_cdevsw); 516 517 /* Nuke the vnodes for any open instances. */ 518 mn = self->dv_unit; 519 vdevgone(maj, mn, mn, VCHR); 520 521 mn |= PLCOMDIALOUT_MASK; 522 vdevgone(maj, mn, mn, VCHR); 523 524 /* Free the receive buffer. */ 525 free(sc->sc_rbuf, M_DEVBUF); 526 527 /* Detach and free the tty. */ 528 tty_detach(sc->sc_tty); 529 ttyfree(sc->sc_tty); 530 531 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 532 /* Unhook the soft interrupt handler. */ 533 softintr_disestablish(sc->sc_si); 534 #endif 535 536 #if NRND > 0 && defined(RND_COM) 537 /* Unhook the entropy source. */ 538 rnd_detach_source(&sc->rnd_source); 539 #endif 540 541 return 0; 542 } 543 544 int 545 plcom_activate(struct device *self, enum devact act) 546 { 547 struct plcom_softc *sc = (struct plcom_softc *)self; 548 int s, rv = 0; 549 550 s = splserial(); 551 PLCOM_LOCK(sc); 552 switch (act) { 553 case DVACT_ACTIVATE: 554 rv = EOPNOTSUPP; 555 break; 556 557 case DVACT_DEACTIVATE: 558 if (sc->sc_hwflags & (PLCOM_HW_CONSOLE|PLCOM_HW_KGDB)) { 559 rv = EBUSY; 560 break; 561 } 562 563 if (sc->disable != NULL && sc->enabled != 0) { 564 (*sc->disable)(sc); 565 sc->enabled = 0; 566 } 567 break; 568 } 569 570 PLCOM_UNLOCK(sc); 571 splx(s); 572 return rv; 573 } 574 575 void 576 plcom_shutdown(struct plcom_softc *sc) 577 { 578 struct tty *tp = sc->sc_tty; 579 int s; 580 581 s = splserial(); 582 PLCOM_LOCK(sc); 583 584 /* If we were asserting flow control, then deassert it. */ 585 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 586 plcom_hwiflow(sc); 587 588 /* Clear any break condition set with TIOCSBRK. */ 589 plcom_break(sc, 0); 590 591 /* Turn off PPS capture on last close. */ 592 sc->sc_ppsmask = 0; 593 sc->ppsparam.mode = 0; 594 595 /* 596 * Hang up if necessary. Wait a bit, so the other side has time to 597 * notice even if we immediately open the port again. 598 * Avoid tsleeping above splhigh(). 599 */ 600 if (ISSET(tp->t_cflag, HUPCL)) { 601 plcom_modem(sc, 0); 602 PLCOM_UNLOCK(sc); 603 splx(s); 604 /* XXX tsleep will only timeout */ 605 (void) tsleep(sc, TTIPRI, ttclos, hz); 606 s = splserial(); 607 PLCOM_LOCK(sc); 608 } 609 610 /* Turn off interrupts. */ 611 if (ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE)) 612 /* interrupt on break */ 613 sc->sc_cr = CR_RIE | CR_RTIE | CR_UARTEN; 614 else 615 sc->sc_cr = 0; 616 bus_space_write_1(sc->sc_iot, sc->sc_ioh, plcom_cr, sc->sc_cr); 617 618 if (sc->disable) { 619 #ifdef DIAGNOSTIC 620 if (!sc->enabled) 621 panic("plcom_shutdown: not enabled?"); 622 #endif 623 (*sc->disable)(sc); 624 sc->enabled = 0; 625 } 626 PLCOM_UNLOCK(sc); 627 splx(s); 628 } 629 630 int 631 plcomopen(dev_t dev, int flag, int mode, struct proc *p) 632 { 633 struct plcom_softc *sc; 634 struct tty *tp; 635 int s, s2; 636 int error; 637 638 sc = device_lookup(&plcom_cd, PLCOMUNIT(dev)); 639 if (sc == NULL || !ISSET(sc->sc_hwflags, PLCOM_HW_DEV_OK) || 640 sc->sc_rbuf == NULL) 641 return ENXIO; 642 643 if (ISSET(sc->sc_dev.dv_flags, DVF_ACTIVE) == 0) 644 return ENXIO; 645 646 #ifdef KGDB 647 /* 648 * If this is the kgdb port, no other use is permitted. 649 */ 650 if (ISSET(sc->sc_hwflags, PLCOM_HW_KGDB)) 651 return EBUSY; 652 #endif 653 654 tp = sc->sc_tty; 655 656 if (ISSET(tp->t_state, TS_ISOPEN) && 657 ISSET(tp->t_state, TS_XCLUDE) && 658 p->p_ucred->cr_uid != 0) 659 return EBUSY; 660 661 s = spltty(); 662 663 /* 664 * Do the following iff this is a first open. 665 */ 666 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 667 struct termios t; 668 669 tp->t_dev = dev; 670 671 s2 = splserial(); 672 PLCOM_LOCK(sc); 673 674 if (sc->enable) { 675 if ((*sc->enable)(sc)) { 676 PLCOM_UNLOCK(sc); 677 splx(s2); 678 splx(s); 679 printf("%s: device enable failed\n", 680 sc->sc_dev.dv_xname); 681 return EIO; 682 } 683 sc->enabled = 1; 684 plcom_config(sc); 685 } 686 687 /* Turn on interrupts. */ 688 /* IER_ERXRDY | IER_ERLS | IER_EMSC; */ 689 sc->sc_cr = CR_RIE | CR_RTIE | CR_MSIE | CR_UARTEN; 690 bus_space_write_1(sc->sc_iot, sc->sc_ioh, plcom_cr, sc->sc_cr); 691 692 /* Fetch the current modem control status, needed later. */ 693 sc->sc_msr = bus_space_read_1(sc->sc_iot, sc->sc_ioh, plcom_fr); 694 695 /* Clear PPS capture state on first open. */ 696 sc->sc_ppsmask = 0; 697 sc->ppsparam.mode = 0; 698 699 PLCOM_UNLOCK(sc); 700 splx(s2); 701 702 /* 703 * Initialize the termios status to the defaults. Add in the 704 * sticky bits from TIOCSFLAGS. 705 */ 706 t.c_ispeed = 0; 707 if (ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE)) { 708 t.c_ospeed = plcomconsrate; 709 t.c_cflag = plcomconscflag; 710 } else { 711 t.c_ospeed = TTYDEF_SPEED; 712 t.c_cflag = TTYDEF_CFLAG; 713 } 714 if (ISSET(sc->sc_swflags, TIOCFLAG_CLOCAL)) 715 SET(t.c_cflag, CLOCAL); 716 if (ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS)) 717 SET(t.c_cflag, CRTSCTS); 718 if (ISSET(sc->sc_swflags, TIOCFLAG_MDMBUF)) 719 SET(t.c_cflag, MDMBUF); 720 /* Make sure plcomparam() will do something. */ 721 tp->t_ospeed = 0; 722 (void) plcomparam(tp, &t); 723 tp->t_iflag = TTYDEF_IFLAG; 724 tp->t_oflag = TTYDEF_OFLAG; 725 tp->t_lflag = TTYDEF_LFLAG; 726 ttychars(tp); 727 ttsetwater(tp); 728 729 s2 = splserial(); 730 PLCOM_LOCK(sc); 731 732 /* 733 * Turn on DTR. We must always do this, even if carrier is not 734 * present, because otherwise we'd have to use TIOCSDTR 735 * immediately after setting CLOCAL, which applications do not 736 * expect. We always assert DTR while the device is open 737 * unless explicitly requested to deassert it. 738 */ 739 plcom_modem(sc, 1); 740 741 /* Clear the input ring, and unblock. */ 742 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 743 sc->sc_rbavail = plcom_rbuf_size; 744 plcom_iflush(sc); 745 CLR(sc->sc_rx_flags, RX_ANY_BLOCK); 746 plcom_hwiflow(sc); 747 748 #ifdef PLCOM_DEBUG 749 if (plcom_debug) 750 plcomstatus(sc, "plcomopen "); 751 #endif 752 753 PLCOM_UNLOCK(sc); 754 splx(s2); 755 } 756 757 splx(s); 758 759 error = ttyopen(tp, PLCOMDIALOUT(dev), ISSET(flag, O_NONBLOCK)); 760 if (error) 761 goto bad; 762 763 error = (*tp->t_linesw->l_open)(dev, tp); 764 if (error) 765 goto bad; 766 767 return 0; 768 769 bad: 770 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 771 /* 772 * We failed to open the device, and nobody else had it opened. 773 * Clean up the state as appropriate. 774 */ 775 plcom_shutdown(sc); 776 } 777 778 return error; 779 } 780 781 int 782 plcomclose(dev_t dev, int flag, int mode, struct proc *p) 783 { 784 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(dev)); 785 struct tty *tp = sc->sc_tty; 786 787 /* XXX This is for cons.c. */ 788 if (!ISSET(tp->t_state, TS_ISOPEN)) 789 return 0; 790 791 (*tp->t_linesw->l_close)(tp, flag); 792 ttyclose(tp); 793 794 if (PLCOM_ISALIVE(sc) == 0) 795 return 0; 796 797 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 798 /* 799 * Although we got a last close, the device may still be in 800 * use; e.g. if this was the dialout node, and there are still 801 * processes waiting for carrier on the non-dialout node. 802 */ 803 plcom_shutdown(sc); 804 } 805 806 return 0; 807 } 808 809 int 810 plcomread(dev_t dev, struct uio *uio, int flag) 811 { 812 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(dev)); 813 struct tty *tp = sc->sc_tty; 814 815 if (PLCOM_ISALIVE(sc) == 0) 816 return EIO; 817 818 return (*tp->t_linesw->l_read)(tp, uio, flag); 819 } 820 821 int 822 plcomwrite(dev_t dev, struct uio *uio, int flag) 823 { 824 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(dev)); 825 struct tty *tp = sc->sc_tty; 826 827 if (PLCOM_ISALIVE(sc) == 0) 828 return EIO; 829 830 return (*tp->t_linesw->l_write)(tp, uio, flag); 831 } 832 833 int 834 plcompoll(dev_t dev, int events, struct proc *p) 835 { 836 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(dev)); 837 struct tty *tp = sc->sc_tty; 838 839 if (PLCOM_ISALIVE(sc) == 0) 840 return EIO; 841 842 return (*tp->t_linesw->l_poll)(tp, events, p); 843 } 844 845 struct tty * 846 plcomtty(dev_t dev) 847 { 848 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(dev)); 849 struct tty *tp = sc->sc_tty; 850 851 return tp; 852 } 853 854 int 855 plcomioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p) 856 { 857 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(dev)); 858 struct tty *tp = sc->sc_tty; 859 int error; 860 int s; 861 862 if (PLCOM_ISALIVE(sc) == 0) 863 return EIO; 864 865 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, p); 866 if (error != EPASSTHROUGH) 867 return error; 868 869 error = ttioctl(tp, cmd, data, flag, p); 870 if (error != EPASSTHROUGH) 871 return error; 872 873 error = 0; 874 875 s = splserial(); 876 PLCOM_LOCK(sc); 877 878 switch (cmd) { 879 case TIOCSBRK: 880 plcom_break(sc, 1); 881 break; 882 883 case TIOCCBRK: 884 plcom_break(sc, 0); 885 break; 886 887 case TIOCSDTR: 888 plcom_modem(sc, 1); 889 break; 890 891 case TIOCCDTR: 892 plcom_modem(sc, 0); 893 break; 894 895 case TIOCGFLAGS: 896 *(int *)data = sc->sc_swflags; 897 break; 898 899 case TIOCSFLAGS: 900 error = suser(p->p_ucred, &p->p_acflag); 901 if (error) 902 break; 903 sc->sc_swflags = *(int *)data; 904 break; 905 906 case TIOCMSET: 907 case TIOCMBIS: 908 case TIOCMBIC: 909 tiocm_to_plcom(sc, cmd, *(int *)data); 910 break; 911 912 case TIOCMGET: 913 *(int *)data = plcom_to_tiocm(sc); 914 break; 915 916 case PPS_IOC_CREATE: 917 break; 918 919 case PPS_IOC_DESTROY: 920 break; 921 922 case PPS_IOC_GETPARAMS: { 923 pps_params_t *pp; 924 pp = (pps_params_t *)data; 925 *pp = sc->ppsparam; 926 break; 927 } 928 929 case PPS_IOC_SETPARAMS: { 930 pps_params_t *pp; 931 int mode; 932 pp = (pps_params_t *)data; 933 if (pp->mode & ~ppscap) { 934 error = EINVAL; 935 break; 936 } 937 sc->ppsparam = *pp; 938 /* 939 * Compute msr masks from user-specified timestamp state. 940 */ 941 mode = sc->ppsparam.mode; 942 #ifdef PPS_SYNC 943 if (mode & PPS_HARDPPSONASSERT) { 944 mode |= PPS_CAPTUREASSERT; 945 /* XXX revoke any previous HARDPPS source */ 946 } 947 if (mode & PPS_HARDPPSONCLEAR) { 948 mode |= PPS_CAPTURECLEAR; 949 /* XXX revoke any previous HARDPPS source */ 950 } 951 #endif /* PPS_SYNC */ 952 switch (mode & PPS_CAPTUREBOTH) { 953 case 0: 954 sc->sc_ppsmask = 0; 955 break; 956 957 case PPS_CAPTUREASSERT: 958 sc->sc_ppsmask = MSR_DCD; 959 sc->sc_ppsassert = MSR_DCD; 960 sc->sc_ppsclear = -1; 961 break; 962 963 case PPS_CAPTURECLEAR: 964 sc->sc_ppsmask = MSR_DCD; 965 sc->sc_ppsassert = -1; 966 sc->sc_ppsclear = 0; 967 break; 968 969 case PPS_CAPTUREBOTH: 970 sc->sc_ppsmask = MSR_DCD; 971 sc->sc_ppsassert = MSR_DCD; 972 sc->sc_ppsclear = 0; 973 break; 974 975 default: 976 error = EINVAL; 977 break; 978 } 979 break; 980 } 981 982 case PPS_IOC_GETCAP: 983 *(int*)data = ppscap; 984 break; 985 986 case PPS_IOC_FETCH: { 987 pps_info_t *pi; 988 pi = (pps_info_t *)data; 989 *pi = sc->ppsinfo; 990 break; 991 } 992 993 case TIOCDCDTIMESTAMP: /* XXX old, overloaded API used by xntpd v3 */ 994 /* 995 * Some GPS clocks models use the falling rather than 996 * rising edge as the on-the-second signal. 997 * The old API has no way to specify PPS polarity. 998 */ 999 sc->sc_ppsmask = MSR_DCD; 1000 #ifndef PPS_TRAILING_EDGE 1001 sc->sc_ppsassert = MSR_DCD; 1002 sc->sc_ppsclear = -1; 1003 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 1004 &sc->ppsinfo.assert_timestamp); 1005 #else 1006 sc->sc_ppsassert = -1 1007 sc->sc_ppsclear = 0; 1008 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 1009 &sc->ppsinfo.clear_timestamp); 1010 #endif 1011 break; 1012 1013 default: 1014 error = EPASSTHROUGH; 1015 break; 1016 } 1017 1018 PLCOM_UNLOCK(sc); 1019 splx(s); 1020 1021 #ifdef PLCOM_DEBUG 1022 if (plcom_debug) 1023 plcomstatus(sc, "plcomioctl "); 1024 #endif 1025 1026 return error; 1027 } 1028 1029 integrate void 1030 plcom_schedrx(struct plcom_softc *sc) 1031 { 1032 1033 sc->sc_rx_ready = 1; 1034 1035 /* Wake up the poller. */ 1036 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 1037 softintr_schedule(sc->sc_si); 1038 #else 1039 #ifndef __NO_SOFT_SERIAL_INTERRUPT 1040 setsoftserial(); 1041 #else 1042 if (!plcom_softintr_scheduled) { 1043 plcom_softintr_scheduled = 1; 1044 callout_reset(&plcomsoft_callout, 1, plcomsoft, NULL); 1045 } 1046 #endif 1047 #endif 1048 } 1049 1050 void 1051 plcom_break(struct plcom_softc *sc, int onoff) 1052 { 1053 1054 if (onoff) 1055 SET(sc->sc_lcr, LCR_BRK); 1056 else 1057 CLR(sc->sc_lcr, LCR_BRK); 1058 1059 if (!sc->sc_heldchange) { 1060 if (sc->sc_tx_busy) { 1061 sc->sc_heldtbc = sc->sc_tbc; 1062 sc->sc_tbc = 0; 1063 sc->sc_heldchange = 1; 1064 } else 1065 plcom_loadchannelregs(sc); 1066 } 1067 } 1068 1069 void 1070 plcom_modem(struct plcom_softc *sc, int onoff) 1071 { 1072 1073 if (sc->sc_mcr_dtr == 0) 1074 return; 1075 1076 if (onoff) 1077 SET(sc->sc_mcr, sc->sc_mcr_dtr); 1078 else 1079 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 1080 1081 if (!sc->sc_heldchange) { 1082 if (sc->sc_tx_busy) { 1083 sc->sc_heldtbc = sc->sc_tbc; 1084 sc->sc_tbc = 0; 1085 sc->sc_heldchange = 1; 1086 } else 1087 plcom_loadchannelregs(sc); 1088 } 1089 } 1090 1091 void 1092 tiocm_to_plcom(struct plcom_softc *sc, u_long how, int ttybits) 1093 { 1094 u_char plcombits; 1095 1096 plcombits = 0; 1097 if (ISSET(ttybits, TIOCM_DTR)) 1098 SET(plcombits, MCR_DTR); 1099 if (ISSET(ttybits, TIOCM_RTS)) 1100 SET(plcombits, MCR_RTS); 1101 1102 switch (how) { 1103 case TIOCMBIC: 1104 CLR(sc->sc_mcr, plcombits); 1105 break; 1106 1107 case TIOCMBIS: 1108 SET(sc->sc_mcr, plcombits); 1109 break; 1110 1111 case TIOCMSET: 1112 CLR(sc->sc_mcr, MCR_DTR | MCR_RTS); 1113 SET(sc->sc_mcr, plcombits); 1114 break; 1115 } 1116 1117 if (!sc->sc_heldchange) { 1118 if (sc->sc_tx_busy) { 1119 sc->sc_heldtbc = sc->sc_tbc; 1120 sc->sc_tbc = 0; 1121 sc->sc_heldchange = 1; 1122 } else 1123 plcom_loadchannelregs(sc); 1124 } 1125 } 1126 1127 int 1128 plcom_to_tiocm(struct plcom_softc *sc) 1129 { 1130 u_char plcombits; 1131 int ttybits = 0; 1132 1133 plcombits = sc->sc_mcr; 1134 if (ISSET(plcombits, MCR_DTR)) 1135 SET(ttybits, TIOCM_DTR); 1136 if (ISSET(plcombits, MCR_RTS)) 1137 SET(ttybits, TIOCM_RTS); 1138 1139 plcombits = sc->sc_msr; 1140 if (ISSET(plcombits, MSR_DCD)) 1141 SET(ttybits, TIOCM_CD); 1142 if (ISSET(plcombits, MSR_CTS)) 1143 SET(ttybits, TIOCM_CTS); 1144 if (ISSET(plcombits, MSR_DSR)) 1145 SET(ttybits, TIOCM_DSR); 1146 1147 if (sc->sc_cr != 0) 1148 SET(ttybits, TIOCM_LE); 1149 1150 return ttybits; 1151 } 1152 1153 static u_char 1154 cflag2lcr(tcflag_t cflag) 1155 { 1156 u_char lcr = 0; 1157 1158 switch (ISSET(cflag, CSIZE)) { 1159 case CS5: 1160 SET(lcr, LCR_5BITS); 1161 break; 1162 case CS6: 1163 SET(lcr, LCR_6BITS); 1164 break; 1165 case CS7: 1166 SET(lcr, LCR_7BITS); 1167 break; 1168 case CS8: 1169 SET(lcr, LCR_8BITS); 1170 break; 1171 } 1172 if (ISSET(cflag, PARENB)) { 1173 SET(lcr, LCR_PEN); 1174 if (!ISSET(cflag, PARODD)) 1175 SET(lcr, LCR_EPS); 1176 } 1177 if (ISSET(cflag, CSTOPB)) 1178 SET(lcr, LCR_STP2); 1179 1180 return lcr; 1181 } 1182 1183 int 1184 plcomparam(struct tty *tp, struct termios *t) 1185 { 1186 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(tp->t_dev)); 1187 int ospeed; 1188 u_char lcr; 1189 int s; 1190 1191 if (PLCOM_ISALIVE(sc) == 0) 1192 return EIO; 1193 1194 ospeed = plcomspeed(t->c_ospeed, sc->sc_frequency); 1195 1196 /* Check requested parameters. */ 1197 if (ospeed < 0) 1198 return EINVAL; 1199 if (t->c_ispeed && t->c_ispeed != t->c_ospeed) 1200 return EINVAL; 1201 1202 /* 1203 * For the console, always force CLOCAL and !HUPCL, so that the port 1204 * is always active. 1205 */ 1206 if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) || 1207 ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE)) { 1208 SET(t->c_cflag, CLOCAL); 1209 CLR(t->c_cflag, HUPCL); 1210 } 1211 1212 /* 1213 * If there were no changes, don't do anything. This avoids dropping 1214 * input and improves performance when all we did was frob things like 1215 * VMIN and VTIME. 1216 */ 1217 if (tp->t_ospeed == t->c_ospeed && 1218 tp->t_cflag == t->c_cflag) 1219 return 0; 1220 1221 lcr = ISSET(sc->sc_lcr, LCR_BRK) | cflag2lcr(t->c_cflag); 1222 1223 s = splserial(); 1224 PLCOM_LOCK(sc); 1225 1226 sc->sc_lcr = lcr; 1227 1228 /* 1229 * PL010 has a fixed-length FIFO trigger point. 1230 */ 1231 if (ISSET(sc->sc_hwflags, PLCOM_HW_FIFO)) 1232 sc->sc_fifo = 1; 1233 else 1234 sc->sc_fifo = 0; 1235 1236 if (sc->sc_fifo) 1237 SET(sc->sc_lcr, LCR_FEN); 1238 1239 /* 1240 * If we're not in a mode that assumes a connection is present, then 1241 * ignore carrier changes. 1242 */ 1243 if (ISSET(t->c_cflag, CLOCAL | MDMBUF)) 1244 sc->sc_msr_dcd = 0; 1245 else 1246 sc->sc_msr_dcd = MSR_DCD; 1247 /* 1248 * Set the flow control pins depending on the current flow control 1249 * mode. 1250 */ 1251 if (ISSET(t->c_cflag, CRTSCTS)) { 1252 sc->sc_mcr_dtr = MCR_DTR; 1253 sc->sc_mcr_rts = MCR_RTS; 1254 sc->sc_msr_cts = MSR_CTS; 1255 } else if (ISSET(t->c_cflag, MDMBUF)) { 1256 /* 1257 * For DTR/DCD flow control, make sure we don't toggle DTR for 1258 * carrier detection. 1259 */ 1260 sc->sc_mcr_dtr = 0; 1261 sc->sc_mcr_rts = MCR_DTR; 1262 sc->sc_msr_cts = MSR_DCD; 1263 } else { 1264 /* 1265 * If no flow control, then always set RTS. This will make 1266 * the other side happy if it mistakenly thinks we're doing 1267 * RTS/CTS flow control. 1268 */ 1269 sc->sc_mcr_dtr = MCR_DTR | MCR_RTS; 1270 sc->sc_mcr_rts = 0; 1271 sc->sc_msr_cts = 0; 1272 if (ISSET(sc->sc_mcr, MCR_DTR)) 1273 SET(sc->sc_mcr, MCR_RTS); 1274 else 1275 CLR(sc->sc_mcr, MCR_RTS); 1276 } 1277 sc->sc_msr_mask = sc->sc_msr_cts | sc->sc_msr_dcd; 1278 1279 #if 0 1280 if (ospeed == 0) 1281 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 1282 else 1283 SET(sc->sc_mcr, sc->sc_mcr_dtr); 1284 #endif 1285 1286 sc->sc_dlbl = ospeed; 1287 sc->sc_dlbh = ospeed >> 8; 1288 1289 /* And copy to tty. */ 1290 tp->t_ispeed = 0; 1291 tp->t_ospeed = t->c_ospeed; 1292 tp->t_cflag = t->c_cflag; 1293 1294 if (!sc->sc_heldchange) { 1295 if (sc->sc_tx_busy) { 1296 sc->sc_heldtbc = sc->sc_tbc; 1297 sc->sc_tbc = 0; 1298 sc->sc_heldchange = 1; 1299 } else 1300 plcom_loadchannelregs(sc); 1301 } 1302 1303 if (!ISSET(t->c_cflag, CHWFLOW)) { 1304 /* Disable the high water mark. */ 1305 sc->sc_r_hiwat = 0; 1306 sc->sc_r_lowat = 0; 1307 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1308 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1309 plcom_schedrx(sc); 1310 } 1311 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 1312 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 1313 plcom_hwiflow(sc); 1314 } 1315 } else { 1316 sc->sc_r_hiwat = plcom_rbuf_hiwat; 1317 sc->sc_r_lowat = plcom_rbuf_lowat; 1318 } 1319 1320 PLCOM_UNLOCK(sc); 1321 splx(s); 1322 1323 /* 1324 * Update the tty layer's idea of the carrier bit, in case we changed 1325 * CLOCAL or MDMBUF. We don't hang up here; we only do that by 1326 * explicit request. 1327 */ 1328 (void) (*tp->t_linesw->l_modem)(tp, ISSET(sc->sc_msr, MSR_DCD)); 1329 1330 #ifdef PLCOM_DEBUG 1331 if (plcom_debug) 1332 plcomstatus(sc, "plcomparam "); 1333 #endif 1334 1335 if (!ISSET(t->c_cflag, CHWFLOW)) { 1336 if (sc->sc_tx_stopped) { 1337 sc->sc_tx_stopped = 0; 1338 plcomstart(tp); 1339 } 1340 } 1341 1342 return 0; 1343 } 1344 1345 void 1346 plcom_iflush(struct plcom_softc *sc) 1347 { 1348 bus_space_tag_t iot = sc->sc_iot; 1349 bus_space_handle_t ioh = sc->sc_ioh; 1350 #ifdef DIAGNOSTIC 1351 int reg; 1352 #endif 1353 int timo; 1354 1355 #ifdef DIAGNOSTIC 1356 reg = 0xffff; 1357 #endif 1358 timo = 50000; 1359 /* flush any pending I/O */ 1360 while (! ISSET(bus_space_read_1(iot, ioh, plcom_fr), FR_RXFE) 1361 && --timo) 1362 #ifdef DIAGNOSTIC 1363 reg = 1364 #else 1365 (void) 1366 #endif 1367 bus_space_read_1(iot, ioh, plcom_dr); 1368 #ifdef DIAGNOSTIC 1369 if (!timo) 1370 printf("%s: plcom_iflush timeout %02x\n", sc->sc_dev.dv_xname, 1371 reg); 1372 #endif 1373 } 1374 1375 void 1376 plcom_loadchannelregs(struct plcom_softc *sc) 1377 { 1378 bus_space_tag_t iot = sc->sc_iot; 1379 bus_space_handle_t ioh = sc->sc_ioh; 1380 1381 /* XXXXX necessary? */ 1382 plcom_iflush(sc); 1383 1384 bus_space_write_1(iot, ioh, plcom_cr, 0); 1385 1386 bus_space_write_1(iot, ioh, plcom_dlbl, sc->sc_dlbl); 1387 bus_space_write_1(iot, ioh, plcom_dlbh, sc->sc_dlbh); 1388 bus_space_write_1(iot, ioh, plcom_lcr, sc->sc_lcr); 1389 sc->sc_set_mcr(sc->sc_set_mcr_arg, sc->sc_dev.dv_unit, 1390 sc->sc_mcr_active = sc->sc_mcr); 1391 1392 bus_space_write_1(iot, ioh, plcom_cr, sc->sc_cr); 1393 } 1394 1395 int 1396 plcomhwiflow(struct tty *tp, int block) 1397 { 1398 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(tp->t_dev)); 1399 int s; 1400 1401 if (PLCOM_ISALIVE(sc) == 0) 1402 return 0; 1403 1404 if (sc->sc_mcr_rts == 0) 1405 return 0; 1406 1407 s = splserial(); 1408 PLCOM_LOCK(sc); 1409 1410 if (block) { 1411 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1412 SET(sc->sc_rx_flags, RX_TTY_BLOCKED); 1413 plcom_hwiflow(sc); 1414 } 1415 } else { 1416 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1417 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1418 plcom_schedrx(sc); 1419 } 1420 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1421 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED); 1422 plcom_hwiflow(sc); 1423 } 1424 } 1425 1426 PLCOM_UNLOCK(sc); 1427 splx(s); 1428 return 1; 1429 } 1430 1431 /* 1432 * (un)block input via hw flowcontrol 1433 */ 1434 void 1435 plcom_hwiflow(struct plcom_softc *sc) 1436 { 1437 if (sc->sc_mcr_rts == 0) 1438 return; 1439 1440 if (ISSET(sc->sc_rx_flags, RX_ANY_BLOCK)) { 1441 CLR(sc->sc_mcr, sc->sc_mcr_rts); 1442 CLR(sc->sc_mcr_active, sc->sc_mcr_rts); 1443 } else { 1444 SET(sc->sc_mcr, sc->sc_mcr_rts); 1445 SET(sc->sc_mcr_active, sc->sc_mcr_rts); 1446 } 1447 sc->sc_set_mcr(sc->sc_set_mcr_arg, sc->sc_dev.dv_unit, 1448 sc->sc_mcr_active); 1449 } 1450 1451 1452 void 1453 plcomstart(struct tty *tp) 1454 { 1455 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(tp->t_dev)); 1456 bus_space_tag_t iot = sc->sc_iot; 1457 bus_space_handle_t ioh = sc->sc_ioh; 1458 int s; 1459 1460 if (PLCOM_ISALIVE(sc) == 0) 1461 return; 1462 1463 s = spltty(); 1464 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 1465 goto out; 1466 if (sc->sc_tx_stopped) 1467 goto out; 1468 1469 if (tp->t_outq.c_cc <= tp->t_lowat) { 1470 if (ISSET(tp->t_state, TS_ASLEEP)) { 1471 CLR(tp->t_state, TS_ASLEEP); 1472 wakeup(&tp->t_outq); 1473 } 1474 selwakeup(&tp->t_wsel); 1475 if (tp->t_outq.c_cc == 0) 1476 goto out; 1477 } 1478 1479 /* Grab the first contiguous region of buffer space. */ 1480 { 1481 u_char *tba; 1482 int tbc; 1483 1484 tba = tp->t_outq.c_cf; 1485 tbc = ndqb(&tp->t_outq, 0); 1486 1487 (void)splserial(); 1488 PLCOM_LOCK(sc); 1489 1490 sc->sc_tba = tba; 1491 sc->sc_tbc = tbc; 1492 } 1493 1494 SET(tp->t_state, TS_BUSY); 1495 sc->sc_tx_busy = 1; 1496 1497 /* Enable transmit completion interrupts if necessary. */ 1498 if (!ISSET(sc->sc_cr, CR_TIE)) { 1499 SET(sc->sc_cr, CR_TIE); 1500 bus_space_write_1(iot, ioh, plcom_cr, sc->sc_cr); 1501 } 1502 1503 /* Output the first chunk of the contiguous buffer. */ 1504 { 1505 int n; 1506 1507 n = sc->sc_tbc; 1508 if (n > sc->sc_fifolen) 1509 n = sc->sc_fifolen; 1510 bus_space_write_multi_1(iot, ioh, plcom_dr, sc->sc_tba, n); 1511 sc->sc_tbc -= n; 1512 sc->sc_tba += n; 1513 } 1514 PLCOM_UNLOCK(sc); 1515 out: 1516 splx(s); 1517 return; 1518 } 1519 1520 /* 1521 * Stop output on a line. 1522 */ 1523 void 1524 plcomstop(struct tty *tp, int flag) 1525 { 1526 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(tp->t_dev)); 1527 int s; 1528 1529 s = splserial(); 1530 PLCOM_LOCK(sc); 1531 if (ISSET(tp->t_state, TS_BUSY)) { 1532 /* Stop transmitting at the next chunk. */ 1533 sc->sc_tbc = 0; 1534 sc->sc_heldtbc = 0; 1535 if (!ISSET(tp->t_state, TS_TTSTOP)) 1536 SET(tp->t_state, TS_FLUSH); 1537 } 1538 PLCOM_UNLOCK(sc); 1539 splx(s); 1540 } 1541 1542 void 1543 plcomdiag(void *arg) 1544 { 1545 struct plcom_softc *sc = arg; 1546 int overflows, floods; 1547 int s; 1548 1549 s = splserial(); 1550 PLCOM_LOCK(sc); 1551 overflows = sc->sc_overflows; 1552 sc->sc_overflows = 0; 1553 floods = sc->sc_floods; 1554 sc->sc_floods = 0; 1555 sc->sc_errors = 0; 1556 PLCOM_UNLOCK(sc); 1557 splx(s); 1558 1559 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1560 sc->sc_dev.dv_xname, 1561 overflows, overflows == 1 ? "" : "s", 1562 floods, floods == 1 ? "" : "s"); 1563 } 1564 1565 integrate void 1566 plcom_rxsoft(struct plcom_softc *sc, struct tty *tp) 1567 { 1568 int (*rint) (int, struct tty *) = tp->t_linesw->l_rint; 1569 u_char *get, *end; 1570 u_int cc, scc; 1571 u_char rsr; 1572 int code; 1573 int s; 1574 1575 end = sc->sc_ebuf; 1576 get = sc->sc_rbget; 1577 scc = cc = plcom_rbuf_size - sc->sc_rbavail; 1578 1579 if (cc == plcom_rbuf_size) { 1580 sc->sc_floods++; 1581 if (sc->sc_errors++ == 0) 1582 callout_reset(&sc->sc_diag_callout, 60 * hz, 1583 plcomdiag, sc); 1584 } 1585 1586 while (cc) { 1587 code = get[0]; 1588 rsr = get[1]; 1589 if (ISSET(rsr, RSR_OE | RSR_BE | RSR_FE | RSR_PE)) { 1590 if (ISSET(rsr, RSR_OE)) { 1591 sc->sc_overflows++; 1592 if (sc->sc_errors++ == 0) 1593 callout_reset(&sc->sc_diag_callout, 1594 60 * hz, plcomdiag, sc); 1595 } 1596 if (ISSET(rsr, RSR_BE | RSR_FE)) 1597 SET(code, TTY_FE); 1598 if (ISSET(rsr, RSR_PE)) 1599 SET(code, TTY_PE); 1600 } 1601 if ((*rint)(code, tp) == -1) { 1602 /* 1603 * The line discipline's buffer is out of space. 1604 */ 1605 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1606 /* 1607 * We're either not using flow control, or the 1608 * line discipline didn't tell us to block for 1609 * some reason. Either way, we have no way to 1610 * know when there's more space available, so 1611 * just drop the rest of the data. 1612 */ 1613 get += cc << 1; 1614 if (get >= end) 1615 get -= plcom_rbuf_size << 1; 1616 cc = 0; 1617 } else { 1618 /* 1619 * Don't schedule any more receive processing 1620 * until the line discipline tells us there's 1621 * space available (through plcomhwiflow()). 1622 * Leave the rest of the data in the input 1623 * buffer. 1624 */ 1625 SET(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1626 } 1627 break; 1628 } 1629 get += 2; 1630 if (get >= end) 1631 get = sc->sc_rbuf; 1632 cc--; 1633 } 1634 1635 if (cc != scc) { 1636 sc->sc_rbget = get; 1637 s = splserial(); 1638 PLCOM_LOCK(sc); 1639 1640 cc = sc->sc_rbavail += scc - cc; 1641 /* Buffers should be ok again, release possible block. */ 1642 if (cc >= sc->sc_r_lowat) { 1643 if (ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1644 CLR(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1645 SET(sc->sc_cr, CR_RIE | CR_RTIE); 1646 bus_space_write_1(sc->sc_iot, sc->sc_ioh, plcom_cr, sc->sc_cr); 1647 } 1648 if (ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED)) { 1649 CLR(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1650 plcom_hwiflow(sc); 1651 } 1652 } 1653 PLCOM_UNLOCK(sc); 1654 splx(s); 1655 } 1656 } 1657 1658 integrate void 1659 plcom_txsoft(struct plcom_softc *sc, struct tty *tp) 1660 { 1661 1662 CLR(tp->t_state, TS_BUSY); 1663 if (ISSET(tp->t_state, TS_FLUSH)) 1664 CLR(tp->t_state, TS_FLUSH); 1665 else 1666 ndflush(&tp->t_outq, (int)(sc->sc_tba - tp->t_outq.c_cf)); 1667 (*tp->t_linesw->l_start)(tp); 1668 } 1669 1670 integrate void 1671 plcom_stsoft(struct plcom_softc *sc, struct tty *tp) 1672 { 1673 u_char msr, delta; 1674 int s; 1675 1676 s = splserial(); 1677 PLCOM_LOCK(sc); 1678 msr = sc->sc_msr; 1679 delta = sc->sc_msr_delta; 1680 sc->sc_msr_delta = 0; 1681 PLCOM_UNLOCK(sc); 1682 splx(s); 1683 1684 if (ISSET(delta, sc->sc_msr_dcd)) { 1685 /* 1686 * Inform the tty layer that carrier detect changed. 1687 */ 1688 (void) (*tp->t_linesw->l_modem)(tp, ISSET(msr, MSR_DCD)); 1689 } 1690 1691 if (ISSET(delta, sc->sc_msr_cts)) { 1692 /* Block or unblock output according to flow control. */ 1693 if (ISSET(msr, sc->sc_msr_cts)) { 1694 sc->sc_tx_stopped = 0; 1695 (*tp->t_linesw->l_start)(tp); 1696 } else { 1697 sc->sc_tx_stopped = 1; 1698 } 1699 } 1700 1701 #ifdef PLCOM_DEBUG 1702 if (plcom_debug) 1703 plcomstatus(sc, "plcom_stsoft"); 1704 #endif 1705 } 1706 1707 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 1708 void 1709 plcomsoft(void *arg) 1710 { 1711 struct plcom_softc *sc = arg; 1712 struct tty *tp; 1713 1714 if (PLCOM_ISALIVE(sc) == 0) 1715 return; 1716 1717 { 1718 #else 1719 void 1720 #ifndef __NO_SOFT_SERIAL_INTERRUPT 1721 plcomsoft(void) 1722 #else 1723 plcomsoft(void *arg) 1724 #endif 1725 { 1726 struct plcom_softc *sc; 1727 struct tty *tp; 1728 int unit; 1729 #ifdef __NO_SOFT_SERIAL_INTERRUPT 1730 int s; 1731 1732 s = splsoftserial(); 1733 plcom_softintr_scheduled = 0; 1734 #endif 1735 1736 for (unit = 0; unit < plcom_cd.cd_ndevs; unit++) { 1737 sc = device_lookup(&plcom_cd, unit); 1738 if (sc == NULL || !ISSET(sc->sc_hwflags, PLCOM_HW_DEV_OK)) 1739 continue; 1740 1741 if (PLCOM_ISALIVE(sc) == 0) 1742 continue; 1743 1744 tp = sc->sc_tty; 1745 if (tp == NULL) 1746 continue; 1747 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) 1748 continue; 1749 #endif 1750 tp = sc->sc_tty; 1751 1752 if (sc->sc_rx_ready) { 1753 sc->sc_rx_ready = 0; 1754 plcom_rxsoft(sc, tp); 1755 } 1756 1757 if (sc->sc_st_check) { 1758 sc->sc_st_check = 0; 1759 plcom_stsoft(sc, tp); 1760 } 1761 1762 if (sc->sc_tx_done) { 1763 sc->sc_tx_done = 0; 1764 plcom_txsoft(sc, tp); 1765 } 1766 } 1767 1768 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS 1769 #ifdef __NO_SOFT_SERIAL_INTERRUPT 1770 splx(s); 1771 #endif 1772 #endif 1773 } 1774 1775 #ifdef __ALIGN_BRACKET_LEVEL_FOR_CTAGS 1776 /* there has got to be a better way to do plcomsoft() */ 1777 }} 1778 #endif 1779 1780 int 1781 plcomintr(void *arg) 1782 { 1783 struct plcom_softc *sc = arg; 1784 bus_space_tag_t iot = sc->sc_iot; 1785 bus_space_handle_t ioh = sc->sc_ioh; 1786 u_char *put, *end; 1787 u_int cc; 1788 u_char rsr, iir; 1789 1790 if (PLCOM_ISALIVE(sc) == 0) 1791 return 0; 1792 1793 PLCOM_LOCK(sc); 1794 iir = bus_space_read_1(iot, ioh, plcom_iir); 1795 if (! ISSET(iir, IIR_IMASK)) { 1796 PLCOM_UNLOCK(sc); 1797 return 0; 1798 } 1799 1800 end = sc->sc_ebuf; 1801 put = sc->sc_rbput; 1802 cc = sc->sc_rbavail; 1803 1804 do { 1805 u_char msr, delta, fr; 1806 1807 fr = bus_space_read_1(iot, ioh, plcom_fr); 1808 1809 if (!ISSET(fr, FR_RXFE) && 1810 !ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1811 while (cc > 0) { 1812 int cn_trapped = 0; 1813 put[0] = bus_space_read_1(iot, ioh, 1814 plcom_dr); 1815 rsr = bus_space_read_1(iot, ioh, plcom_rsr); 1816 /* Clear any error status. */ 1817 if (ISSET(rsr, 1818 (RSR_BE | RSR_OE | RSR_PE | RSR_FE))) 1819 bus_space_write_1(iot, ioh, plcom_ecr, 1820 0); 1821 if (ISSET(rsr, RSR_BE)) { 1822 int cn_trapped = 0; 1823 cn_check_magic(sc->sc_tty->t_dev, 1824 CNC_BREAK, plcom_cnm_state); 1825 if (cn_trapped) 1826 continue; 1827 #if defined(KGDB) 1828 if (ISSET(sc->sc_hwflags, 1829 PLCOM_HW_KGDB)) { 1830 kgdb_connect(1); 1831 continue; 1832 } 1833 #endif 1834 } 1835 1836 put[1] = rsr; 1837 cn_check_magic(sc->sc_tty->t_dev, 1838 put[0], plcom_cnm_state); 1839 if (cn_trapped) { 1840 fr = bus_space_read_1(iot, ioh, 1841 plcom_fr); 1842 if (ISSET(fr, FR_RXFE)) 1843 break; 1844 1845 continue; 1846 } 1847 put += 2; 1848 if (put >= end) 1849 put = sc->sc_rbuf; 1850 cc--; 1851 1852 fr = bus_space_read_1(iot, ioh, plcom_fr); 1853 if (ISSET(fr, FR_RXFE)) 1854 break; 1855 } 1856 1857 /* 1858 * Current string of incoming characters ended because 1859 * no more data was available or we ran out of space. 1860 * Schedule a receive event if any data was received. 1861 * If we're out of space, turn off receive interrupts. 1862 */ 1863 sc->sc_rbput = put; 1864 sc->sc_rbavail = cc; 1865 if (!ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) 1866 sc->sc_rx_ready = 1; 1867 1868 /* 1869 * See if we are in danger of overflowing a buffer. If 1870 * so, use hardware flow control to ease the pressure. 1871 */ 1872 if (!ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED) && 1873 cc < sc->sc_r_hiwat) { 1874 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1875 plcom_hwiflow(sc); 1876 } 1877 1878 /* 1879 * If we're out of space, disable receive interrupts 1880 * until the queue has drained a bit. 1881 */ 1882 if (!cc) { 1883 SET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1884 CLR(sc->sc_cr, CR_RIE | CR_RTIE); 1885 bus_space_write_1(iot, ioh, plcom_cr, 1886 sc->sc_cr); 1887 } 1888 } else { 1889 if (ISSET(iir, IIR_RIS)) { 1890 bus_space_write_1(iot, ioh, plcom_cr, 0); 1891 delay(10); 1892 bus_space_write_1(iot, ioh, plcom_cr, 1893 sc->sc_cr); 1894 continue; 1895 } 1896 } 1897 1898 msr = bus_space_read_1(iot, ioh, plcom_fr); 1899 delta = msr ^ sc->sc_msr; 1900 sc->sc_msr = msr; 1901 /* Clear any pending modem status interrupt. */ 1902 if (iir & IIR_MIS) 1903 bus_space_write_1(iot, ioh, plcom_icr, 0); 1904 /* 1905 * Pulse-per-second (PSS) signals on edge of DCD? 1906 * Process these even if line discipline is ignoring DCD. 1907 */ 1908 if (delta & sc->sc_ppsmask) { 1909 struct timeval tv; 1910 if ((msr & sc->sc_ppsmask) == sc->sc_ppsassert) { 1911 /* XXX nanotime() */ 1912 microtime(&tv); 1913 TIMEVAL_TO_TIMESPEC(&tv, 1914 &sc->ppsinfo.assert_timestamp); 1915 if (sc->ppsparam.mode & PPS_OFFSETASSERT) { 1916 timespecadd(&sc->ppsinfo.assert_timestamp, 1917 &sc->ppsparam.assert_offset, 1918 &sc->ppsinfo.assert_timestamp); 1919 } 1920 1921 #ifdef PPS_SYNC 1922 if (sc->ppsparam.mode & PPS_HARDPPSONASSERT) 1923 hardpps(&tv, tv.tv_usec); 1924 #endif 1925 sc->ppsinfo.assert_sequence++; 1926 sc->ppsinfo.current_mode = sc->ppsparam.mode; 1927 1928 } else if ((msr & sc->sc_ppsmask) == sc->sc_ppsclear) { 1929 /* XXX nanotime() */ 1930 microtime(&tv); 1931 TIMEVAL_TO_TIMESPEC(&tv, 1932 &sc->ppsinfo.clear_timestamp); 1933 if (sc->ppsparam.mode & PPS_OFFSETCLEAR) { 1934 timespecadd(&sc->ppsinfo.clear_timestamp, 1935 &sc->ppsparam.clear_offset, 1936 &sc->ppsinfo.clear_timestamp); 1937 } 1938 1939 #ifdef PPS_SYNC 1940 if (sc->ppsparam.mode & PPS_HARDPPSONCLEAR) 1941 hardpps(&tv, tv.tv_usec); 1942 #endif 1943 sc->ppsinfo.clear_sequence++; 1944 sc->ppsinfo.current_mode = sc->ppsparam.mode; 1945 } 1946 } 1947 1948 /* 1949 * Process normal status changes 1950 */ 1951 if (ISSET(delta, sc->sc_msr_mask)) { 1952 SET(sc->sc_msr_delta, delta); 1953 1954 /* 1955 * Stop output immediately if we lose the output 1956 * flow control signal or carrier detect. 1957 */ 1958 if (ISSET(~msr, sc->sc_msr_mask)) { 1959 sc->sc_tbc = 0; 1960 sc->sc_heldtbc = 0; 1961 #ifdef PLCOM_DEBUG 1962 if (plcom_debug) 1963 plcomstatus(sc, "plcomintr "); 1964 #endif 1965 } 1966 1967 sc->sc_st_check = 1; 1968 } 1969 1970 /* 1971 * Done handling any receive interrupts. See if data 1972 * can be * transmitted as well. Schedule tx done 1973 * event if no data left * and tty was marked busy. 1974 */ 1975 if (ISSET(iir, IIR_TIS)) { 1976 /* 1977 * If we've delayed a parameter change, do it 1978 * now, and restart * output. 1979 */ 1980 if (sc->sc_heldchange) { 1981 plcom_loadchannelregs(sc); 1982 sc->sc_heldchange = 0; 1983 sc->sc_tbc = sc->sc_heldtbc; 1984 sc->sc_heldtbc = 0; 1985 } 1986 1987 /* 1988 * Output the next chunk of the contiguous 1989 * buffer, if any. 1990 */ 1991 if (sc->sc_tbc > 0) { 1992 int n; 1993 1994 n = sc->sc_tbc; 1995 if (n > sc->sc_fifolen) 1996 n = sc->sc_fifolen; 1997 bus_space_write_multi_1(iot, ioh, plcom_dr, 1998 sc->sc_tba, n); 1999 sc->sc_tbc -= n; 2000 sc->sc_tba += n; 2001 } else { 2002 /* 2003 * Disable transmit plcompletion 2004 * interrupts if necessary. 2005 */ 2006 if (ISSET(sc->sc_cr, CR_TIE)) { 2007 CLR(sc->sc_cr, CR_TIE); 2008 bus_space_write_1(iot, ioh, plcom_cr, 2009 sc->sc_cr); 2010 } 2011 if (sc->sc_tx_busy) { 2012 sc->sc_tx_busy = 0; 2013 sc->sc_tx_done = 1; 2014 } 2015 } 2016 } 2017 } while (ISSET((iir = bus_space_read_1(iot, ioh, plcom_iir)), 2018 IIR_IMASK)); 2019 2020 PLCOM_UNLOCK(sc); 2021 2022 /* Wake up the poller. */ 2023 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 2024 softintr_schedule(sc->sc_si); 2025 #else 2026 #ifndef __NO_SOFT_SERIAL_INTERRUPT 2027 setsoftserial(); 2028 #else 2029 if (!plcom_softintr_scheduled) { 2030 plcom_softintr_scheduled = 1; 2031 callout_reset(&plcomsoft_callout, 1, plcomsoft, NULL); 2032 } 2033 #endif 2034 #endif 2035 2036 #if NRND > 0 && defined(RND_COM) 2037 rnd_add_uint32(&sc->rnd_source, iir | rsr); 2038 #endif 2039 2040 return 1; 2041 } 2042 2043 /* 2044 * The following functions are polled getc and putc routines, shared 2045 * by the console and kgdb glue. 2046 * 2047 * The read-ahead code is so that you can detect pending in-band 2048 * cn_magic in polled mode while doing output rather than having to 2049 * wait until the kernel decides it needs input. 2050 */ 2051 2052 #define MAX_READAHEAD 20 2053 static int plcom_readahead[MAX_READAHEAD]; 2054 static int plcom_readaheadcount = 0; 2055 2056 int 2057 plcom_common_getc(dev_t dev, bus_space_tag_t iot, bus_space_handle_t ioh) 2058 { 2059 int s = splserial(); 2060 u_char stat, c; 2061 2062 /* got a character from reading things earlier */ 2063 if (plcom_readaheadcount > 0) { 2064 int i; 2065 2066 c = plcom_readahead[0]; 2067 for (i = 1; i < plcom_readaheadcount; i++) { 2068 plcom_readahead[i-1] = plcom_readahead[i]; 2069 } 2070 plcom_readaheadcount--; 2071 splx(s); 2072 return c; 2073 } 2074 2075 /* block until a character becomes available */ 2076 while (ISSET(stat = bus_space_read_1(iot, ioh, plcom_fr), FR_RXFE)) 2077 ; 2078 2079 c = bus_space_read_1(iot, ioh, plcom_dr); 2080 stat = bus_space_read_1(iot, ioh, plcom_iir); 2081 { 2082 int cn_trapped = 0; /* unused */ 2083 #ifdef DDB 2084 extern int db_active; 2085 if (!db_active) 2086 #endif 2087 cn_check_magic(dev, c, plcom_cnm_state); 2088 } 2089 splx(s); 2090 return c; 2091 } 2092 2093 void 2094 plcom_common_putc(dev_t dev, bus_space_tag_t iot, bus_space_handle_t ioh, 2095 int c) 2096 { 2097 int s = splserial(); 2098 int timo; 2099 2100 int cin, stat; 2101 if (plcom_readaheadcount < MAX_READAHEAD 2102 && !ISSET(stat = bus_space_read_1(iot, ioh, plcom_fr), FR_RXFE)) { 2103 int cn_trapped = 0; 2104 cin = bus_space_read_1(iot, ioh, plcom_dr); 2105 stat = bus_space_read_1(iot, ioh, plcom_iir); 2106 cn_check_magic(dev, cin, plcom_cnm_state); 2107 plcom_readahead[plcom_readaheadcount++] = cin; 2108 } 2109 2110 /* wait for any pending transmission to finish */ 2111 timo = 150000; 2112 while (!ISSET(bus_space_read_1(iot, ioh, plcom_fr), FR_TXFE) && --timo) 2113 continue; 2114 2115 bus_space_write_1(iot, ioh, plcom_dr, c); 2116 PLCOM_BARRIER(iot, ioh, BR | BW); 2117 2118 /* wait for this transmission to complete */ 2119 timo = 1500000; 2120 while (!ISSET(bus_space_read_1(iot, ioh, plcom_fr), FR_TXFE) && --timo) 2121 continue; 2122 2123 splx(s); 2124 } 2125 2126 /* 2127 * Initialize UART for use as console or KGDB line. 2128 */ 2129 int 2130 plcominit(bus_space_tag_t iot, bus_addr_t iobase, int rate, int frequency, 2131 tcflag_t cflag, bus_space_handle_t *iohp) 2132 { 2133 bus_space_handle_t ioh; 2134 2135 if (bus_space_map(iot, iobase, PLCOM_UART_SIZE, 0, &ioh)) 2136 return ENOMEM; /* ??? */ 2137 2138 rate = plcomspeed(rate, frequency); 2139 bus_space_write_1(iot, ioh, plcom_cr, 0); 2140 bus_space_write_1(iot, ioh, plcom_dlbl, rate); 2141 bus_space_write_1(iot, ioh, plcom_dlbh, rate >> 8); 2142 bus_space_write_1(iot, ioh, plcom_lcr, cflag2lcr(cflag) | LCR_FEN); 2143 bus_space_write_1(iot, ioh, plcom_cr, CR_UARTEN); 2144 2145 #if 0 2146 /* Ought to do something like this, but we have no sc to 2147 dereference. */ 2148 sc->sc_set_mcr(sc->sc_set_mcr_arg, sc->sc_dev.dv_unit, 2149 MCR_DTR | MCR_RTS); 2150 #endif 2151 2152 *iohp = ioh; 2153 return 0; 2154 } 2155 2156 /* 2157 * Following are all routines needed for PLCOM to act as console 2158 */ 2159 struct consdev plcomcons = { 2160 NULL, NULL, plcomcngetc, plcomcnputc, plcomcnpollc, NULL, 2161 NULL, NULL, NODEV, CN_NORMAL 2162 }; 2163 2164 2165 int 2166 plcomcnattach(bus_space_tag_t iot, bus_addr_t iobase, int rate, int frequency, 2167 tcflag_t cflag, int unit) 2168 { 2169 int res; 2170 2171 res = plcominit(iot, iobase, rate, frequency, cflag, &plcomconsioh); 2172 if (res) 2173 return res; 2174 2175 cn_tab = &plcomcons; 2176 cn_init_magic(&plcom_cnm_state); 2177 cn_set_magic("\047\001"); /* default magic is BREAK */ 2178 2179 plcomconstag = iot; 2180 plcomconsunit = unit; 2181 plcomconsrate = rate; 2182 plcomconscflag = cflag; 2183 2184 return 0; 2185 } 2186 2187 void 2188 plcomcndetach(void) 2189 { 2190 bus_space_unmap(plcomconstag, plcomconsioh, PLCOM_UART_SIZE); 2191 plcomconstag = NULL; 2192 2193 cn_tab = NULL; 2194 } 2195 2196 int 2197 plcomcngetc(dev_t dev) 2198 { 2199 return plcom_common_getc(dev, plcomconstag, plcomconsioh); 2200 } 2201 2202 /* 2203 * Console kernel output character routine. 2204 */ 2205 void 2206 plcomcnputc(dev_t dev, int c) 2207 { 2208 plcom_common_putc(dev, plcomconstag, plcomconsioh, c); 2209 } 2210 2211 void 2212 plcomcnpollc(dev_t dev, int on) 2213 { 2214 2215 } 2216 2217 #ifdef KGDB 2218 int 2219 plcom_kgdb_attach(bus_space_tag_t iot, bus_addr_t iobase, int rate, 2220 int frequency, tcflag_t cflag, int unit) 2221 { 2222 int res; 2223 2224 if (iot == plcomconstag && iobase == plcomconsunit) 2225 return EBUSY; /* cannot share with console */ 2226 2227 res = plcominit(iot, iobase, rate, frequency, cflag, &plcom_kgdb_ioh); 2228 if (res) 2229 return res; 2230 2231 kgdb_attach(plcom_kgdb_getc, plcom_kgdb_putc, NULL); 2232 kgdb_dev = 123; /* unneeded, only to satisfy some tests */ 2233 2234 plcom_kgdb_iot = iot; 2235 plcom_kgdb_unit = unit; 2236 2237 return 0; 2238 } 2239 2240 /* ARGSUSED */ 2241 int 2242 plcom_kgdb_getc(void *arg) 2243 { 2244 return plcom_common_getc(NODEV, plcom_kgdb_iot, plcom_kgdb_ioh); 2245 } 2246 2247 /* ARGSUSED */ 2248 void 2249 plcom_kgdb_putc(void *arg, int c) 2250 { 2251 plcom_common_putc(NODEV, plcom_kgdb_iot, plcom_kgdb_ioh, c); 2252 } 2253 #endif /* KGDB */ 2254 2255 /* helper function to identify the plcom ports used by 2256 console or KGDB (and not yet autoconf attached) */ 2257 int 2258 plcom_is_console(bus_space_tag_t iot, int unit, 2259 bus_space_handle_t *ioh) 2260 { 2261 bus_space_handle_t help; 2262 2263 if (!plcomconsattached && 2264 iot == plcomconstag && unit == plcomconsunit) 2265 help = plcomconsioh; 2266 #ifdef KGDB 2267 else if (!plcom_kgdb_attached && 2268 iot == plcom_kgdb_iot && unit == plcom_kgdb_unit) 2269 help = plcom_kgdb_ioh; 2270 #endif 2271 else 2272 return 0; 2273 2274 if (ioh) 2275 *ioh = help; 2276 return 1; 2277 } 2278
Indexes created Sun Oct 19 16:10:00 GMT 2025