plcom.c revision 1.5
1 /* $NetBSD: plcom.c,v 1.5 2002/10/23 09:11:01 jdolecek 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 "opt_plcom.h" 108 #include "opt_ddb.h" 109 #include "opt_kgdb.h" 110 111 #include "rnd.h" 112 #if NRND > 0 && defined(RND_COM) 113 #include <sys/rnd.h> 114 #endif 115 116 /* 117 * Override cnmagic(9) macro before including <sys/systm.h>. 118 * We need to know if cn_check_magic triggered debugger, so set a flag. 119 * Callers of cn_check_magic must declare int cn_trapped = 0; 120 * XXX: this is *ugly*! 121 */ 122 #define cn_trap() \ 123 do { \ 124 console_debugger(); \ 125 cn_trapped = 1; \ 126 } while (/* CONSTCOND */ 0) 127 128 #include <sys/param.h> 129 #include <sys/systm.h> 130 #include <sys/ioctl.h> 131 #include <sys/select.h> 132 #include <sys/tty.h> 133 #include <sys/proc.h> 134 #include <sys/user.h> 135 #include <sys/conf.h> 136 #include <sys/file.h> 137 #include <sys/uio.h> 138 #include <sys/kernel.h> 139 #include <sys/syslog.h> 140 #include <sys/types.h> 141 #include <sys/device.h> 142 #include <sys/malloc.h> 143 #include <sys/timepps.h> 144 #include <sys/vnode.h> 145 146 #include <machine/intr.h> 147 #include <machine/bus.h> 148 149 #include <evbarm/dev/plcomreg.h> 150 #include <evbarm/dev/plcomvar.h> 151 152 #include <dev/cons.h> 153 154 static void plcom_enable_debugport (struct plcom_softc *); 155 156 void plcom_config (struct plcom_softc *); 157 void plcom_shutdown (struct plcom_softc *); 158 int plcomspeed (long, long); 159 static u_char cflag2lcr (tcflag_t); 160 int plcomparam (struct tty *, struct termios *); 161 void plcomstart (struct tty *); 162 int plcomhwiflow (struct tty *, int); 163 164 void plcom_loadchannelregs (struct plcom_softc *); 165 void plcom_hwiflow (struct plcom_softc *); 166 void plcom_break (struct plcom_softc *, int); 167 void plcom_modem (struct plcom_softc *, int); 168 void tiocm_to_plcom (struct plcom_softc *, u_long, int); 169 int plcom_to_tiocm (struct plcom_softc *); 170 void plcom_iflush (struct plcom_softc *); 171 172 int plcom_common_getc (dev_t, bus_space_tag_t, bus_space_handle_t); 173 void plcom_common_putc (dev_t, bus_space_tag_t, bus_space_handle_t, int); 174 175 int plcominit (bus_space_tag_t, bus_addr_t, int, int, tcflag_t, 176 bus_space_handle_t *); 177 178 dev_type_open(plcomopen); 179 dev_type_close(plcomclose); 180 dev_type_read(plcomread); 181 dev_type_write(plcomwrite); 182 dev_type_ioctl(plcomioctl); 183 dev_type_stop(plcomstop); 184 dev_type_tty(plcomtty); 185 dev_type_poll(plcompoll); 186 187 int plcomcngetc (dev_t); 188 void plcomcnputc (dev_t, int); 189 void plcomcnpollc (dev_t, int); 190 191 #define integrate static inline 192 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 193 void plcomsoft (void *); 194 #else 195 #ifndef __NO_SOFT_SERIAL_INTERRUPT 196 void plcomsoft (void); 197 #else 198 void plcomsoft (void *); 199 struct callout plcomsoft_callout = CALLOUT_INITIALIZER; 200 #endif 201 #endif 202 integrate void plcom_rxsoft (struct plcom_softc *, struct tty *); 203 integrate void plcom_txsoft (struct plcom_softc *, struct tty *); 204 integrate void plcom_stsoft (struct plcom_softc *, struct tty *); 205 integrate void plcom_schedrx (struct plcom_softc *); 206 void plcomdiag (void *); 207 208 extern struct cfdriver plcom_cd; 209 210 const struct cdevsw plcom_cdevsw = { 211 plcomopen, plcomclose, plcomread, plcomwrite, plcomioctl, 212 plcomstop, plcomtty, plcompoll, nommap, ttykqfilter, D_TTY 213 }; 214 215 /* 216 * Make this an option variable one can patch. 217 * But be warned: this must be a power of 2! 218 */ 219 u_int plcom_rbuf_size = PLCOM_RING_SIZE; 220 221 /* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */ 222 u_int plcom_rbuf_hiwat = (PLCOM_RING_SIZE * 1) / 4; 223 u_int plcom_rbuf_lowat = (PLCOM_RING_SIZE * 3) / 4; 224 225 static int plcomconsunit = -1; 226 static bus_space_tag_t plcomconstag; 227 static bus_space_handle_t plcomconsioh; 228 static int plcomconsattached; 229 static int plcomconsrate; 230 static tcflag_t plcomconscflag; 231 static struct cnm_state plcom_cnm_state; 232 233 static int ppscap = 234 PPS_TSFMT_TSPEC | 235 PPS_CAPTUREASSERT | 236 PPS_CAPTURECLEAR | 237 #ifdef PPS_SYNC 238 PPS_HARDPPSONASSERT | PPS_HARDPPSONCLEAR | 239 #endif /* PPS_SYNC */ 240 PPS_OFFSETASSERT | PPS_OFFSETCLEAR; 241 242 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS 243 #ifdef __NO_SOFT_SERIAL_INTERRUPT 244 volatile int plcom_softintr_scheduled; 245 #endif 246 #endif 247 248 #ifdef KGDB 249 #include <sys/kgdb.h> 250 251 static int plcom_kgdb_unit; 252 static bus_space_tag_t plcom_kgdb_iot; 253 static bus_space_handle_t plcom_kgdb_ioh; 254 static int plcom_kgdb_attached; 255 256 int plcom_kgdb_getc (void *); 257 void plcom_kgdb_putc (void *, int); 258 #endif /* KGDB */ 259 260 #define PLCOMUNIT_MASK 0x7ffff 261 #define PLCOMDIALOUT_MASK 0x80000 262 263 #define PLCOMUNIT(x) (minor(x) & PLCOMUNIT_MASK) 264 #define PLCOMDIALOUT(x) (minor(x) & PLCOMDIALOUT_MASK) 265 266 #define PLCOM_ISALIVE(sc) ((sc)->enabled != 0 && \ 267 ISSET((sc)->sc_dev.dv_flags, DVF_ACTIVE)) 268 269 #define BR BUS_SPACE_BARRIER_READ 270 #define BW BUS_SPACE_BARRIER_WRITE 271 #define PLCOM_BARRIER(t, h, f) bus_space_barrier((t), (h), 0, PLCOM_UART_SIZE, (f)) 272 273 #if (defined(MULTIPROCESSOR) || defined(LOCKDEBUG)) && defined(PLCOM_MPLOCK) 274 275 #define PLCOM_LOCK(sc) simple_lock(&(sc)->sc_lock) 276 #define PLCOM_UNLOCK(sc) simple_unlock(&(sc)->sc_lock) 277 278 #else 279 280 #define PLCOM_LOCK(sc) 281 #define PLCOM_UNLOCK(sc) 282 283 #endif 284 285 int 286 plcomspeed(long speed, long frequency) 287 { 288 #define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */ 289 290 int x, err; 291 292 #if 0 293 if (speed == 0) 294 return 0; 295 #endif 296 if (speed <= 0) 297 return -1; 298 x = divrnd(frequency / 16, speed); 299 if (x <= 0) 300 return -1; 301 err = divrnd(((quad_t)frequency) * 1000 / 16, speed * x) - 1000; 302 if (err < 0) 303 err = -err; 304 if (err > PLCOM_TOLERANCE) 305 return -1; 306 return x; 307 308 #undef divrnd 309 } 310 311 #ifdef PLCOM_DEBUG 312 int plcom_debug = 0; 313 314 void plcomstatus (struct plcom_softc *, char *); 315 void 316 plcomstatus(struct plcom_softc *sc, char *str) 317 { 318 struct tty *tp = sc->sc_tty; 319 320 printf("%s: %s %sclocal %sdcd %sts_carr_on %sdtr %stx_stopped\n", 321 sc->sc_dev.dv_xname, str, 322 ISSET(tp->t_cflag, CLOCAL) ? "+" : "-", 323 ISSET(sc->sc_msr, MSR_DCD) ? "+" : "-", 324 ISSET(tp->t_state, TS_CARR_ON) ? "+" : "-", 325 ISSET(sc->sc_mcr, MCR_DTR) ? "+" : "-", 326 sc->sc_tx_stopped ? "+" : "-"); 327 328 printf("%s: %s %scrtscts %scts %sts_ttstop %srts %xrx_flags\n", 329 sc->sc_dev.dv_xname, str, 330 ISSET(tp->t_cflag, CRTSCTS) ? "+" : "-", 331 ISSET(sc->sc_msr, MSR_CTS) ? "+" : "-", 332 ISSET(tp->t_state, TS_TTSTOP) ? "+" : "-", 333 ISSET(sc->sc_mcr, MCR_RTS) ? "+" : "-", 334 sc->sc_rx_flags); 335 } 336 #endif 337 338 int 339 plcomprobe1(bus_space_tag_t iot, bus_space_handle_t ioh) 340 { 341 int data; 342 343 /* Disable the UART. */ 344 bus_space_write_1(iot, ioh, plcom_cr, 0); 345 /* Make sure the FIFO is off. */ 346 bus_space_write_1(iot, ioh, plcom_lcr, LCR_8BITS); 347 /* Disable interrupts. */ 348 bus_space_write_1(iot, ioh, plcom_iir, 0); 349 350 /* Make sure we swallow anything in the receiving register. */ 351 data = bus_space_read_1(iot, ioh, plcom_dr); 352 353 if (bus_space_read_1(iot, ioh, plcom_lcr) != LCR_8BITS) 354 return 0; 355 356 data = bus_space_read_1(iot, ioh, plcom_fr) & (FR_RXFF | FR_RXFE); 357 358 if (data != FR_RXFE) 359 return 0; 360 361 return 1; 362 } 363 364 static void 365 plcom_enable_debugport(struct plcom_softc *sc) 366 { 367 int s; 368 369 /* Turn on line break interrupt, set carrier. */ 370 s = splserial(); 371 PLCOM_LOCK(sc); 372 sc->sc_cr = CR_RIE | CR_RTIE | CR_UARTEN; 373 bus_space_write_1(sc->sc_iot, sc->sc_ioh, plcom_cr, sc->sc_cr); 374 SET(sc->sc_mcr, MCR_DTR | MCR_RTS); 375 sc->sc_set_mcr(sc->sc_set_mcr_arg, sc->sc_dev.dv_unit, sc->sc_mcr); 376 PLCOM_UNLOCK(sc); 377 splx(s); 378 } 379 380 void 381 plcom_attach_subr(struct plcom_softc *sc) 382 { 383 int unit = sc->sc_iounit; 384 bus_space_tag_t iot = sc->sc_iot; 385 bus_space_handle_t ioh = sc->sc_ioh; 386 struct tty *tp; 387 388 callout_init(&sc->sc_diag_callout); 389 #if (defined(MULTIPROCESSOR) || defined(LOCKDEBUG)) && defined(PLCOM_MPLOCK) 390 simple_lock_init(&sc->sc_lock); 391 #endif 392 393 /* Disable interrupts before configuring the device. */ 394 sc->sc_cr = 0; 395 396 if (plcomconstag && unit == plcomconsunit) { 397 plcomconsattached = 1; 398 399 plcomconstag = iot; 400 plcomconsioh = ioh; 401 402 /* Make sure the console is always "hardwired". */ 403 delay(1000); /* wait for output to finish */ 404 SET(sc->sc_hwflags, PLCOM_HW_CONSOLE); 405 SET(sc->sc_swflags, TIOCFLAG_SOFTCAR); 406 /* Must re-enable the console immediately, or we will 407 hang when trying to print. */ 408 sc->sc_cr = CR_UARTEN; 409 } 410 411 bus_space_write_1(iot, ioh, plcom_cr, sc->sc_cr); 412 413 /* The PL010 has a 16-byte fifo, but the tx interrupt triggers when 414 there is space for 8 more bytes. */ 415 sc->sc_fifolen = 8; 416 printf("\n"); 417 418 if (ISSET(sc->sc_hwflags, PLCOM_HW_TXFIFO_DISABLE)) { 419 sc->sc_fifolen = 1; 420 printf("%s: txfifo disabled\n", sc->sc_dev.dv_xname); 421 } 422 423 if (sc->sc_fifolen > 1) 424 SET(sc->sc_hwflags, PLCOM_HW_FIFO); 425 426 tp = ttymalloc(); 427 tp->t_oproc = plcomstart; 428 tp->t_param = plcomparam; 429 tp->t_hwiflow = plcomhwiflow; 430 431 sc->sc_tty = tp; 432 sc->sc_rbuf = malloc(plcom_rbuf_size << 1, M_DEVBUF, M_NOWAIT); 433 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 434 sc->sc_rbavail = plcom_rbuf_size; 435 if (sc->sc_rbuf == NULL) { 436 printf("%s: unable to allocate ring buffer\n", 437 sc->sc_dev.dv_xname); 438 return; 439 } 440 sc->sc_ebuf = sc->sc_rbuf + (plcom_rbuf_size << 1); 441 442 tty_attach(tp); 443 444 if (ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE)) { 445 int maj; 446 447 /* locate the major number */ 448 maj = cdevsw_lookup_major(&plcom_cdevsw); 449 450 cn_tab->cn_dev = makedev(maj, sc->sc_dev.dv_unit); 451 452 printf("%s: console\n", sc->sc_dev.dv_xname); 453 } 454 455 #ifdef KGDB 456 /* 457 * Allow kgdb to "take over" this port. If this is 458 * the kgdb device, it has exclusive use. 459 */ 460 if (iot == plcom_kgdb_iot && unit == plcom_kgdb_unit) { 461 plcom_kgdb_attached = 1; 462 463 SET(sc->sc_hwflags, PLCOM_HW_KGDB); 464 printf("%s: kgdb\n", sc->sc_dev.dv_xname); 465 } 466 #endif 467 468 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 469 sc->sc_si = softintr_establish(IPL_SOFTSERIAL, plcomsoft, sc); 470 #endif 471 472 #if NRND > 0 && defined(RND_COM) 473 rnd_attach_source(&sc->rnd_source, sc->sc_dev.dv_xname, 474 RND_TYPE_TTY, 0); 475 #endif 476 477 /* if there are no enable/disable functions, assume the device 478 is always enabled */ 479 if (!sc->enable) 480 sc->enabled = 1; 481 482 plcom_config(sc); 483 484 SET(sc->sc_hwflags, PLCOM_HW_DEV_OK); 485 } 486 487 void 488 plcom_config(struct plcom_softc *sc) 489 { 490 bus_space_tag_t iot = sc->sc_iot; 491 bus_space_handle_t ioh = sc->sc_ioh; 492 493 /* Disable interrupts before configuring the device. */ 494 sc->sc_cr = 0; 495 bus_space_write_1(iot, ioh, plcom_cr, sc->sc_cr); 496 497 if (ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE|PLCOM_HW_KGDB)) 498 plcom_enable_debugport(sc); 499 } 500 501 int 502 plcom_detach(self, flags) 503 struct device *self; 504 int flags; 505 { 506 struct plcom_softc *sc = (struct plcom_softc *)self; 507 int maj, mn; 508 509 /* locate the major number */ 510 maj = cdevsw_lookup_major(&plcom_cdevsw); 511 512 /* Nuke the vnodes for any open instances. */ 513 mn = self->dv_unit; 514 vdevgone(maj, mn, mn, VCHR); 515 516 mn |= PLCOMDIALOUT_MASK; 517 vdevgone(maj, mn, mn, VCHR); 518 519 /* Free the receive buffer. */ 520 free(sc->sc_rbuf, M_DEVBUF); 521 522 /* Detach and free the tty. */ 523 tty_detach(sc->sc_tty); 524 ttyfree(sc->sc_tty); 525 526 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 527 /* Unhook the soft interrupt handler. */ 528 softintr_disestablish(sc->sc_si); 529 #endif 530 531 #if NRND > 0 && defined(RND_COM) 532 /* Unhook the entropy source. */ 533 rnd_detach_source(&sc->rnd_source); 534 #endif 535 536 return 0; 537 } 538 539 int 540 plcom_activate(struct device *self, enum devact act) 541 { 542 struct plcom_softc *sc = (struct plcom_softc *)self; 543 int s, rv = 0; 544 545 s = splserial(); 546 PLCOM_LOCK(sc); 547 switch (act) { 548 case DVACT_ACTIVATE: 549 rv = EOPNOTSUPP; 550 break; 551 552 case DVACT_DEACTIVATE: 553 if (sc->sc_hwflags & (PLCOM_HW_CONSOLE|PLCOM_HW_KGDB)) { 554 rv = EBUSY; 555 break; 556 } 557 558 if (sc->disable != NULL && sc->enabled != 0) { 559 (*sc->disable)(sc); 560 sc->enabled = 0; 561 } 562 break; 563 } 564 565 PLCOM_UNLOCK(sc); 566 splx(s); 567 return rv; 568 } 569 570 void 571 plcom_shutdown(struct plcom_softc *sc) 572 { 573 struct tty *tp = sc->sc_tty; 574 int s; 575 576 s = splserial(); 577 PLCOM_LOCK(sc); 578 579 /* If we were asserting flow control, then deassert it. */ 580 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 581 plcom_hwiflow(sc); 582 583 /* Clear any break condition set with TIOCSBRK. */ 584 plcom_break(sc, 0); 585 586 /* Turn off PPS capture on last close. */ 587 sc->sc_ppsmask = 0; 588 sc->ppsparam.mode = 0; 589 590 /* 591 * Hang up if necessary. Wait a bit, so the other side has time to 592 * notice even if we immediately open the port again. 593 * Avoid tsleeping above splhigh(). 594 */ 595 if (ISSET(tp->t_cflag, HUPCL)) { 596 plcom_modem(sc, 0); 597 PLCOM_UNLOCK(sc); 598 splx(s); 599 /* XXX tsleep will only timeout */ 600 (void) tsleep(sc, TTIPRI, ttclos, hz); 601 s = splserial(); 602 PLCOM_LOCK(sc); 603 } 604 605 /* Turn off interrupts. */ 606 if (ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE)) 607 /* interrupt on break */ 608 sc->sc_cr = CR_RIE | CR_RTIE | CR_UARTEN; 609 else 610 sc->sc_cr = 0; 611 bus_space_write_1(sc->sc_iot, sc->sc_ioh, plcom_cr, sc->sc_cr); 612 613 if (sc->disable) { 614 #ifdef DIAGNOSTIC 615 if (!sc->enabled) 616 panic("plcom_shutdown: not enabled?"); 617 #endif 618 (*sc->disable)(sc); 619 sc->enabled = 0; 620 } 621 PLCOM_UNLOCK(sc); 622 splx(s); 623 } 624 625 int 626 plcomopen(dev_t dev, int flag, int mode, struct proc *p) 627 { 628 struct plcom_softc *sc; 629 struct tty *tp; 630 int s, s2; 631 int error; 632 633 sc = device_lookup(&plcom_cd, PLCOMUNIT(dev)); 634 if (sc == NULL || !ISSET(sc->sc_hwflags, PLCOM_HW_DEV_OK) || 635 sc->sc_rbuf == NULL) 636 return ENXIO; 637 638 if (ISSET(sc->sc_dev.dv_flags, DVF_ACTIVE) == 0) 639 return ENXIO; 640 641 #ifdef KGDB 642 /* 643 * If this is the kgdb port, no other use is permitted. 644 */ 645 if (ISSET(sc->sc_hwflags, PLCOM_HW_KGDB)) 646 return EBUSY; 647 #endif 648 649 tp = sc->sc_tty; 650 651 if (ISSET(tp->t_state, TS_ISOPEN) && 652 ISSET(tp->t_state, TS_XCLUDE) && 653 p->p_ucred->cr_uid != 0) 654 return EBUSY; 655 656 s = spltty(); 657 658 /* 659 * Do the following iff this is a first open. 660 */ 661 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 662 struct termios t; 663 664 tp->t_dev = dev; 665 666 s2 = splserial(); 667 PLCOM_LOCK(sc); 668 669 if (sc->enable) { 670 if ((*sc->enable)(sc)) { 671 PLCOM_UNLOCK(sc); 672 splx(s2); 673 splx(s); 674 printf("%s: device enable failed\n", 675 sc->sc_dev.dv_xname); 676 return EIO; 677 } 678 sc->enabled = 1; 679 plcom_config(sc); 680 } 681 682 /* Turn on interrupts. */ 683 /* IER_ERXRDY | IER_ERLS | IER_EMSC; */ 684 sc->sc_cr = CR_RIE | CR_RTIE | CR_MSIE | CR_UARTEN; 685 bus_space_write_1(sc->sc_iot, sc->sc_ioh, plcom_cr, sc->sc_cr); 686 687 /* Fetch the current modem control status, needed later. */ 688 sc->sc_msr = bus_space_read_1(sc->sc_iot, sc->sc_ioh, plcom_fr); 689 690 /* Clear PPS capture state on first open. */ 691 sc->sc_ppsmask = 0; 692 sc->ppsparam.mode = 0; 693 694 PLCOM_UNLOCK(sc); 695 splx(s2); 696 697 /* 698 * Initialize the termios status to the defaults. Add in the 699 * sticky bits from TIOCSFLAGS. 700 */ 701 t.c_ispeed = 0; 702 if (ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE)) { 703 t.c_ospeed = plcomconsrate; 704 t.c_cflag = plcomconscflag; 705 } else { 706 t.c_ospeed = TTYDEF_SPEED; 707 t.c_cflag = TTYDEF_CFLAG; 708 } 709 if (ISSET(sc->sc_swflags, TIOCFLAG_CLOCAL)) 710 SET(t.c_cflag, CLOCAL); 711 if (ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS)) 712 SET(t.c_cflag, CRTSCTS); 713 if (ISSET(sc->sc_swflags, TIOCFLAG_MDMBUF)) 714 SET(t.c_cflag, MDMBUF); 715 /* Make sure plcomparam() will do something. */ 716 tp->t_ospeed = 0; 717 (void) plcomparam(tp, &t); 718 tp->t_iflag = TTYDEF_IFLAG; 719 tp->t_oflag = TTYDEF_OFLAG; 720 tp->t_lflag = TTYDEF_LFLAG; 721 ttychars(tp); 722 ttsetwater(tp); 723 724 s2 = splserial(); 725 PLCOM_LOCK(sc); 726 727 /* 728 * Turn on DTR. We must always do this, even if carrier is not 729 * present, because otherwise we'd have to use TIOCSDTR 730 * immediately after setting CLOCAL, which applications do not 731 * expect. We always assert DTR while the device is open 732 * unless explicitly requested to deassert it. 733 */ 734 plcom_modem(sc, 1); 735 736 /* Clear the input ring, and unblock. */ 737 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 738 sc->sc_rbavail = plcom_rbuf_size; 739 plcom_iflush(sc); 740 CLR(sc->sc_rx_flags, RX_ANY_BLOCK); 741 plcom_hwiflow(sc); 742 743 #ifdef PLCOM_DEBUG 744 if (plcom_debug) 745 plcomstatus(sc, "plcomopen "); 746 #endif 747 748 PLCOM_UNLOCK(sc); 749 splx(s2); 750 } 751 752 splx(s); 753 754 error = ttyopen(tp, PLCOMDIALOUT(dev), ISSET(flag, O_NONBLOCK)); 755 if (error) 756 goto bad; 757 758 error = (*tp->t_linesw->l_open)(dev, tp); 759 if (error) 760 goto bad; 761 762 return 0; 763 764 bad: 765 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 766 /* 767 * We failed to open the device, and nobody else had it opened. 768 * Clean up the state as appropriate. 769 */ 770 plcom_shutdown(sc); 771 } 772 773 return error; 774 } 775 776 int 777 plcomclose(dev_t dev, int flag, int mode, struct proc *p) 778 { 779 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(dev)); 780 struct tty *tp = sc->sc_tty; 781 782 /* XXX This is for cons.c. */ 783 if (!ISSET(tp->t_state, TS_ISOPEN)) 784 return 0; 785 786 (*tp->t_linesw->l_close)(tp, flag); 787 ttyclose(tp); 788 789 if (PLCOM_ISALIVE(sc) == 0) 790 return 0; 791 792 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 793 /* 794 * Although we got a last close, the device may still be in 795 * use; e.g. if this was the dialout node, and there are still 796 * processes waiting for carrier on the non-dialout node. 797 */ 798 plcom_shutdown(sc); 799 } 800 801 return 0; 802 } 803 804 int 805 plcomread(dev_t dev, struct uio *uio, int flag) 806 { 807 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(dev)); 808 struct tty *tp = sc->sc_tty; 809 810 if (PLCOM_ISALIVE(sc) == 0) 811 return EIO; 812 813 return (*tp->t_linesw->l_read)(tp, uio, flag); 814 } 815 816 int 817 plcomwrite(dev_t dev, struct uio *uio, int flag) 818 { 819 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(dev)); 820 struct tty *tp = sc->sc_tty; 821 822 if (PLCOM_ISALIVE(sc) == 0) 823 return EIO; 824 825 return (*tp->t_linesw->l_write)(tp, uio, flag); 826 } 827 828 int 829 plcompoll(dev_t dev, int events, struct proc *p) 830 { 831 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(dev)); 832 struct tty *tp = sc->sc_tty; 833 834 if (PLCOM_ISALIVE(sc) == 0) 835 return EIO; 836 837 return (*tp->t_linesw->l_poll)(tp, events, p); 838 } 839 840 struct tty * 841 plcomtty(dev_t dev) 842 { 843 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(dev)); 844 struct tty *tp = sc->sc_tty; 845 846 return tp; 847 } 848 849 int 850 plcomioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p) 851 { 852 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(dev)); 853 struct tty *tp = sc->sc_tty; 854 int error; 855 int s; 856 857 if (PLCOM_ISALIVE(sc) == 0) 858 return EIO; 859 860 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, p); 861 if (error != EPASSTHROUGH) 862 return error; 863 864 error = ttioctl(tp, cmd, data, flag, p); 865 if (error != EPASSTHROUGH) 866 return error; 867 868 error = 0; 869 870 s = splserial(); 871 PLCOM_LOCK(sc); 872 873 switch (cmd) { 874 case TIOCSBRK: 875 plcom_break(sc, 1); 876 break; 877 878 case TIOCCBRK: 879 plcom_break(sc, 0); 880 break; 881 882 case TIOCSDTR: 883 plcom_modem(sc, 1); 884 break; 885 886 case TIOCCDTR: 887 plcom_modem(sc, 0); 888 break; 889 890 case TIOCGFLAGS: 891 *(int *)data = sc->sc_swflags; 892 break; 893 894 case TIOCSFLAGS: 895 error = suser(p->p_ucred, &p->p_acflag); 896 if (error) 897 break; 898 sc->sc_swflags = *(int *)data; 899 break; 900 901 case TIOCMSET: 902 case TIOCMBIS: 903 case TIOCMBIC: 904 tiocm_to_plcom(sc, cmd, *(int *)data); 905 break; 906 907 case TIOCMGET: 908 *(int *)data = plcom_to_tiocm(sc); 909 break; 910 911 case PPS_IOC_CREATE: 912 break; 913 914 case PPS_IOC_DESTROY: 915 break; 916 917 case PPS_IOC_GETPARAMS: { 918 pps_params_t *pp; 919 pp = (pps_params_t *)data; 920 *pp = sc->ppsparam; 921 break; 922 } 923 924 case PPS_IOC_SETPARAMS: { 925 pps_params_t *pp; 926 int mode; 927 pp = (pps_params_t *)data; 928 if (pp->mode & ~ppscap) { 929 error = EINVAL; 930 break; 931 } 932 sc->ppsparam = *pp; 933 /* 934 * Compute msr masks from user-specified timestamp state. 935 */ 936 mode = sc->ppsparam.mode; 937 #ifdef PPS_SYNC 938 if (mode & PPS_HARDPPSONASSERT) { 939 mode |= PPS_CAPTUREASSERT; 940 /* XXX revoke any previous HARDPPS source */ 941 } 942 if (mode & PPS_HARDPPSONCLEAR) { 943 mode |= PPS_CAPTURECLEAR; 944 /* XXX revoke any previous HARDPPS source */ 945 } 946 #endif /* PPS_SYNC */ 947 switch (mode & PPS_CAPTUREBOTH) { 948 case 0: 949 sc->sc_ppsmask = 0; 950 break; 951 952 case PPS_CAPTUREASSERT: 953 sc->sc_ppsmask = MSR_DCD; 954 sc->sc_ppsassert = MSR_DCD; 955 sc->sc_ppsclear = -1; 956 break; 957 958 case PPS_CAPTURECLEAR: 959 sc->sc_ppsmask = MSR_DCD; 960 sc->sc_ppsassert = -1; 961 sc->sc_ppsclear = 0; 962 break; 963 964 case PPS_CAPTUREBOTH: 965 sc->sc_ppsmask = MSR_DCD; 966 sc->sc_ppsassert = MSR_DCD; 967 sc->sc_ppsclear = 0; 968 break; 969 970 default: 971 error = EINVAL; 972 break; 973 } 974 break; 975 } 976 977 case PPS_IOC_GETCAP: 978 *(int*)data = ppscap; 979 break; 980 981 case PPS_IOC_FETCH: { 982 pps_info_t *pi; 983 pi = (pps_info_t *)data; 984 *pi = sc->ppsinfo; 985 break; 986 } 987 988 case TIOCDCDTIMESTAMP: /* XXX old, overloaded API used by xntpd v3 */ 989 /* 990 * Some GPS clocks models use the falling rather than 991 * rising edge as the on-the-second signal. 992 * The old API has no way to specify PPS polarity. 993 */ 994 sc->sc_ppsmask = MSR_DCD; 995 #ifndef PPS_TRAILING_EDGE 996 sc->sc_ppsassert = MSR_DCD; 997 sc->sc_ppsclear = -1; 998 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 999 &sc->ppsinfo.assert_timestamp); 1000 #else 1001 sc->sc_ppsassert = -1 1002 sc->sc_ppsclear = 0; 1003 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 1004 &sc->ppsinfo.clear_timestamp); 1005 #endif 1006 break; 1007 1008 default: 1009 error = EPASSTHROUGH; 1010 break; 1011 } 1012 1013 PLCOM_UNLOCK(sc); 1014 splx(s); 1015 1016 #ifdef PLCOM_DEBUG 1017 if (plcom_debug) 1018 plcomstatus(sc, "plcomioctl "); 1019 #endif 1020 1021 return error; 1022 } 1023 1024 integrate void 1025 plcom_schedrx(struct plcom_softc *sc) 1026 { 1027 1028 sc->sc_rx_ready = 1; 1029 1030 /* Wake up the poller. */ 1031 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 1032 softintr_schedule(sc->sc_si); 1033 #else 1034 #ifndef __NO_SOFT_SERIAL_INTERRUPT 1035 setsoftserial(); 1036 #else 1037 if (!plcom_softintr_scheduled) { 1038 plcom_softintr_scheduled = 1; 1039 callout_reset(&plcomsoft_callout, 1, plcomsoft, NULL); 1040 } 1041 #endif 1042 #endif 1043 } 1044 1045 void 1046 plcom_break(struct plcom_softc *sc, int onoff) 1047 { 1048 1049 if (onoff) 1050 SET(sc->sc_lcr, LCR_BRK); 1051 else 1052 CLR(sc->sc_lcr, LCR_BRK); 1053 1054 if (!sc->sc_heldchange) { 1055 if (sc->sc_tx_busy) { 1056 sc->sc_heldtbc = sc->sc_tbc; 1057 sc->sc_tbc = 0; 1058 sc->sc_heldchange = 1; 1059 } else 1060 plcom_loadchannelregs(sc); 1061 } 1062 } 1063 1064 void 1065 plcom_modem(struct plcom_softc *sc, int onoff) 1066 { 1067 1068 if (sc->sc_mcr_dtr == 0) 1069 return; 1070 1071 if (onoff) 1072 SET(sc->sc_mcr, sc->sc_mcr_dtr); 1073 else 1074 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 1075 1076 if (!sc->sc_heldchange) { 1077 if (sc->sc_tx_busy) { 1078 sc->sc_heldtbc = sc->sc_tbc; 1079 sc->sc_tbc = 0; 1080 sc->sc_heldchange = 1; 1081 } else 1082 plcom_loadchannelregs(sc); 1083 } 1084 } 1085 1086 void 1087 tiocm_to_plcom(struct plcom_softc *sc, u_long how, int ttybits) 1088 { 1089 u_char plcombits; 1090 1091 plcombits = 0; 1092 if (ISSET(ttybits, TIOCM_DTR)) 1093 SET(plcombits, MCR_DTR); 1094 if (ISSET(ttybits, TIOCM_RTS)) 1095 SET(plcombits, MCR_RTS); 1096 1097 switch (how) { 1098 case TIOCMBIC: 1099 CLR(sc->sc_mcr, plcombits); 1100 break; 1101 1102 case TIOCMBIS: 1103 SET(sc->sc_mcr, plcombits); 1104 break; 1105 1106 case TIOCMSET: 1107 CLR(sc->sc_mcr, MCR_DTR | MCR_RTS); 1108 SET(sc->sc_mcr, plcombits); 1109 break; 1110 } 1111 1112 if (!sc->sc_heldchange) { 1113 if (sc->sc_tx_busy) { 1114 sc->sc_heldtbc = sc->sc_tbc; 1115 sc->sc_tbc = 0; 1116 sc->sc_heldchange = 1; 1117 } else 1118 plcom_loadchannelregs(sc); 1119 } 1120 } 1121 1122 int 1123 plcom_to_tiocm(struct plcom_softc *sc) 1124 { 1125 u_char plcombits; 1126 int ttybits = 0; 1127 1128 plcombits = sc->sc_mcr; 1129 if (ISSET(plcombits, MCR_DTR)) 1130 SET(ttybits, TIOCM_DTR); 1131 if (ISSET(plcombits, MCR_RTS)) 1132 SET(ttybits, TIOCM_RTS); 1133 1134 plcombits = sc->sc_msr; 1135 if (ISSET(plcombits, MSR_DCD)) 1136 SET(ttybits, TIOCM_CD); 1137 if (ISSET(plcombits, MSR_CTS)) 1138 SET(ttybits, TIOCM_CTS); 1139 if (ISSET(plcombits, MSR_DSR)) 1140 SET(ttybits, TIOCM_DSR); 1141 1142 if (sc->sc_cr != 0) 1143 SET(ttybits, TIOCM_LE); 1144 1145 return ttybits; 1146 } 1147 1148 static u_char 1149 cflag2lcr(tcflag_t cflag) 1150 { 1151 u_char lcr = 0; 1152 1153 switch (ISSET(cflag, CSIZE)) { 1154 case CS5: 1155 SET(lcr, LCR_5BITS); 1156 break; 1157 case CS6: 1158 SET(lcr, LCR_6BITS); 1159 break; 1160 case CS7: 1161 SET(lcr, LCR_7BITS); 1162 break; 1163 case CS8: 1164 SET(lcr, LCR_8BITS); 1165 break; 1166 } 1167 if (ISSET(cflag, PARENB)) { 1168 SET(lcr, LCR_PEN); 1169 if (!ISSET(cflag, PARODD)) 1170 SET(lcr, LCR_EPS); 1171 } 1172 if (ISSET(cflag, CSTOPB)) 1173 SET(lcr, LCR_STP2); 1174 1175 return lcr; 1176 } 1177 1178 int 1179 plcomparam(struct tty *tp, struct termios *t) 1180 { 1181 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(tp->t_dev)); 1182 int ospeed; 1183 u_char lcr; 1184 int s; 1185 1186 if (PLCOM_ISALIVE(sc) == 0) 1187 return EIO; 1188 1189 ospeed = plcomspeed(t->c_ospeed, sc->sc_frequency); 1190 1191 /* Check requested parameters. */ 1192 if (ospeed < 0) 1193 return EINVAL; 1194 if (t->c_ispeed && t->c_ispeed != t->c_ospeed) 1195 return EINVAL; 1196 1197 /* 1198 * For the console, always force CLOCAL and !HUPCL, so that the port 1199 * is always active. 1200 */ 1201 if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) || 1202 ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE)) { 1203 SET(t->c_cflag, CLOCAL); 1204 CLR(t->c_cflag, HUPCL); 1205 } 1206 1207 /* 1208 * If there were no changes, don't do anything. This avoids dropping 1209 * input and improves performance when all we did was frob things like 1210 * VMIN and VTIME. 1211 */ 1212 if (tp->t_ospeed == t->c_ospeed && 1213 tp->t_cflag == t->c_cflag) 1214 return 0; 1215 1216 lcr = ISSET(sc->sc_lcr, LCR_BRK) | cflag2lcr(t->c_cflag); 1217 1218 s = splserial(); 1219 PLCOM_LOCK(sc); 1220 1221 sc->sc_lcr = lcr; 1222 1223 /* 1224 * PL010 has a fixed-length FIFO trigger point. 1225 */ 1226 if (ISSET(sc->sc_hwflags, PLCOM_HW_FIFO)) 1227 sc->sc_fifo = 1; 1228 else 1229 sc->sc_fifo = 0; 1230 1231 if (sc->sc_fifo) 1232 SET(sc->sc_lcr, LCR_FEN); 1233 1234 /* 1235 * If we're not in a mode that assumes a connection is present, then 1236 * ignore carrier changes. 1237 */ 1238 if (ISSET(t->c_cflag, CLOCAL | MDMBUF)) 1239 sc->sc_msr_dcd = 0; 1240 else 1241 sc->sc_msr_dcd = MSR_DCD; 1242 /* 1243 * Set the flow control pins depending on the current flow control 1244 * mode. 1245 */ 1246 if (ISSET(t->c_cflag, CRTSCTS)) { 1247 sc->sc_mcr_dtr = MCR_DTR; 1248 sc->sc_mcr_rts = MCR_RTS; 1249 sc->sc_msr_cts = MSR_CTS; 1250 } else if (ISSET(t->c_cflag, MDMBUF)) { 1251 /* 1252 * For DTR/DCD flow control, make sure we don't toggle DTR for 1253 * carrier detection. 1254 */ 1255 sc->sc_mcr_dtr = 0; 1256 sc->sc_mcr_rts = MCR_DTR; 1257 sc->sc_msr_cts = MSR_DCD; 1258 } else { 1259 /* 1260 * If no flow control, then always set RTS. This will make 1261 * the other side happy if it mistakenly thinks we're doing 1262 * RTS/CTS flow control. 1263 */ 1264 sc->sc_mcr_dtr = MCR_DTR | MCR_RTS; 1265 sc->sc_mcr_rts = 0; 1266 sc->sc_msr_cts = 0; 1267 if (ISSET(sc->sc_mcr, MCR_DTR)) 1268 SET(sc->sc_mcr, MCR_RTS); 1269 else 1270 CLR(sc->sc_mcr, MCR_RTS); 1271 } 1272 sc->sc_msr_mask = sc->sc_msr_cts | sc->sc_msr_dcd; 1273 1274 #if 0 1275 if (ospeed == 0) 1276 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 1277 else 1278 SET(sc->sc_mcr, sc->sc_mcr_dtr); 1279 #endif 1280 1281 sc->sc_dlbl = ospeed; 1282 sc->sc_dlbh = ospeed >> 8; 1283 1284 /* And copy to tty. */ 1285 tp->t_ispeed = 0; 1286 tp->t_ospeed = t->c_ospeed; 1287 tp->t_cflag = t->c_cflag; 1288 1289 if (!sc->sc_heldchange) { 1290 if (sc->sc_tx_busy) { 1291 sc->sc_heldtbc = sc->sc_tbc; 1292 sc->sc_tbc = 0; 1293 sc->sc_heldchange = 1; 1294 } else 1295 plcom_loadchannelregs(sc); 1296 } 1297 1298 if (!ISSET(t->c_cflag, CHWFLOW)) { 1299 /* Disable the high water mark. */ 1300 sc->sc_r_hiwat = 0; 1301 sc->sc_r_lowat = 0; 1302 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1303 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1304 plcom_schedrx(sc); 1305 } 1306 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 1307 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 1308 plcom_hwiflow(sc); 1309 } 1310 } else { 1311 sc->sc_r_hiwat = plcom_rbuf_hiwat; 1312 sc->sc_r_lowat = plcom_rbuf_lowat; 1313 } 1314 1315 PLCOM_UNLOCK(sc); 1316 splx(s); 1317 1318 /* 1319 * Update the tty layer's idea of the carrier bit, in case we changed 1320 * CLOCAL or MDMBUF. We don't hang up here; we only do that by 1321 * explicit request. 1322 */ 1323 (void) (*tp->t_linesw->l_modem)(tp, ISSET(sc->sc_msr, MSR_DCD)); 1324 1325 #ifdef PLCOM_DEBUG 1326 if (plcom_debug) 1327 plcomstatus(sc, "plcomparam "); 1328 #endif 1329 1330 if (!ISSET(t->c_cflag, CHWFLOW)) { 1331 if (sc->sc_tx_stopped) { 1332 sc->sc_tx_stopped = 0; 1333 plcomstart(tp); 1334 } 1335 } 1336 1337 return 0; 1338 } 1339 1340 void 1341 plcom_iflush(struct plcom_softc *sc) 1342 { 1343 bus_space_tag_t iot = sc->sc_iot; 1344 bus_space_handle_t ioh = sc->sc_ioh; 1345 #ifdef DIAGNOSTIC 1346 int reg; 1347 #endif 1348 int timo; 1349 1350 #ifdef DIAGNOSTIC 1351 reg = 0xffff; 1352 #endif 1353 timo = 50000; 1354 /* flush any pending I/O */ 1355 while (! ISSET(bus_space_read_1(iot, ioh, plcom_fr), FR_RXFE) 1356 && --timo) 1357 #ifdef DIAGNOSTIC 1358 reg = 1359 #else 1360 (void) 1361 #endif 1362 bus_space_read_1(iot, ioh, plcom_dr); 1363 #ifdef DIAGNOSTIC 1364 if (!timo) 1365 printf("%s: plcom_iflush timeout %02x\n", sc->sc_dev.dv_xname, 1366 reg); 1367 #endif 1368 } 1369 1370 void 1371 plcom_loadchannelregs(struct plcom_softc *sc) 1372 { 1373 bus_space_tag_t iot = sc->sc_iot; 1374 bus_space_handle_t ioh = sc->sc_ioh; 1375 1376 /* XXXXX necessary? */ 1377 plcom_iflush(sc); 1378 1379 bus_space_write_1(iot, ioh, plcom_cr, 0); 1380 1381 bus_space_write_1(iot, ioh, plcom_dlbl, sc->sc_dlbl); 1382 bus_space_write_1(iot, ioh, plcom_dlbh, sc->sc_dlbh); 1383 bus_space_write_1(iot, ioh, plcom_lcr, sc->sc_lcr); 1384 sc->sc_set_mcr(sc->sc_set_mcr_arg, sc->sc_dev.dv_unit, 1385 sc->sc_mcr_active = sc->sc_mcr); 1386 1387 bus_space_write_1(iot, ioh, plcom_cr, sc->sc_cr); 1388 } 1389 1390 int 1391 plcomhwiflow(struct tty *tp, int block) 1392 { 1393 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(tp->t_dev)); 1394 int s; 1395 1396 if (PLCOM_ISALIVE(sc) == 0) 1397 return 0; 1398 1399 if (sc->sc_mcr_rts == 0) 1400 return 0; 1401 1402 s = splserial(); 1403 PLCOM_LOCK(sc); 1404 1405 if (block) { 1406 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1407 SET(sc->sc_rx_flags, RX_TTY_BLOCKED); 1408 plcom_hwiflow(sc); 1409 } 1410 } else { 1411 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1412 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1413 plcom_schedrx(sc); 1414 } 1415 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1416 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED); 1417 plcom_hwiflow(sc); 1418 } 1419 } 1420 1421 PLCOM_UNLOCK(sc); 1422 splx(s); 1423 return 1; 1424 } 1425 1426 /* 1427 * (un)block input via hw flowcontrol 1428 */ 1429 void 1430 plcom_hwiflow(struct plcom_softc *sc) 1431 { 1432 if (sc->sc_mcr_rts == 0) 1433 return; 1434 1435 if (ISSET(sc->sc_rx_flags, RX_ANY_BLOCK)) { 1436 CLR(sc->sc_mcr, sc->sc_mcr_rts); 1437 CLR(sc->sc_mcr_active, sc->sc_mcr_rts); 1438 } else { 1439 SET(sc->sc_mcr, sc->sc_mcr_rts); 1440 SET(sc->sc_mcr_active, sc->sc_mcr_rts); 1441 } 1442 sc->sc_set_mcr(sc->sc_set_mcr_arg, sc->sc_dev.dv_unit, 1443 sc->sc_mcr_active); 1444 } 1445 1446 1447 void 1448 plcomstart(struct tty *tp) 1449 { 1450 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(tp->t_dev)); 1451 bus_space_tag_t iot = sc->sc_iot; 1452 bus_space_handle_t ioh = sc->sc_ioh; 1453 int s; 1454 1455 if (PLCOM_ISALIVE(sc) == 0) 1456 return; 1457 1458 s = spltty(); 1459 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 1460 goto out; 1461 if (sc->sc_tx_stopped) 1462 goto out; 1463 1464 if (tp->t_outq.c_cc <= tp->t_lowat) { 1465 if (ISSET(tp->t_state, TS_ASLEEP)) { 1466 CLR(tp->t_state, TS_ASLEEP); 1467 wakeup(&tp->t_outq); 1468 } 1469 selwakeup(&tp->t_wsel); 1470 if (tp->t_outq.c_cc == 0) 1471 goto out; 1472 } 1473 1474 /* Grab the first contiguous region of buffer space. */ 1475 { 1476 u_char *tba; 1477 int tbc; 1478 1479 tba = tp->t_outq.c_cf; 1480 tbc = ndqb(&tp->t_outq, 0); 1481 1482 (void)splserial(); 1483 PLCOM_LOCK(sc); 1484 1485 sc->sc_tba = tba; 1486 sc->sc_tbc = tbc; 1487 } 1488 1489 SET(tp->t_state, TS_BUSY); 1490 sc->sc_tx_busy = 1; 1491 1492 /* Enable transmit completion interrupts if necessary. */ 1493 if (!ISSET(sc->sc_cr, CR_TIE)) { 1494 SET(sc->sc_cr, CR_TIE); 1495 bus_space_write_1(iot, ioh, plcom_cr, sc->sc_cr); 1496 } 1497 1498 /* Output the first chunk of the contiguous buffer. */ 1499 { 1500 int n; 1501 1502 n = sc->sc_tbc; 1503 if (n > sc->sc_fifolen) 1504 n = sc->sc_fifolen; 1505 bus_space_write_multi_1(iot, ioh, plcom_dr, sc->sc_tba, n); 1506 sc->sc_tbc -= n; 1507 sc->sc_tba += n; 1508 } 1509 PLCOM_UNLOCK(sc); 1510 out: 1511 splx(s); 1512 return; 1513 } 1514 1515 /* 1516 * Stop output on a line. 1517 */ 1518 void 1519 plcomstop(struct tty *tp, int flag) 1520 { 1521 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(tp->t_dev)); 1522 int s; 1523 1524 s = splserial(); 1525 PLCOM_LOCK(sc); 1526 if (ISSET(tp->t_state, TS_BUSY)) { 1527 /* Stop transmitting at the next chunk. */ 1528 sc->sc_tbc = 0; 1529 sc->sc_heldtbc = 0; 1530 if (!ISSET(tp->t_state, TS_TTSTOP)) 1531 SET(tp->t_state, TS_FLUSH); 1532 } 1533 PLCOM_UNLOCK(sc); 1534 splx(s); 1535 } 1536 1537 void 1538 plcomdiag(void *arg) 1539 { 1540 struct plcom_softc *sc = arg; 1541 int overflows, floods; 1542 int s; 1543 1544 s = splserial(); 1545 PLCOM_LOCK(sc); 1546 overflows = sc->sc_overflows; 1547 sc->sc_overflows = 0; 1548 floods = sc->sc_floods; 1549 sc->sc_floods = 0; 1550 sc->sc_errors = 0; 1551 PLCOM_UNLOCK(sc); 1552 splx(s); 1553 1554 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1555 sc->sc_dev.dv_xname, 1556 overflows, overflows == 1 ? "" : "s", 1557 floods, floods == 1 ? "" : "s"); 1558 } 1559 1560 integrate void 1561 plcom_rxsoft(struct plcom_softc *sc, struct tty *tp) 1562 { 1563 int (*rint) (int, struct tty *) = tp->t_linesw->l_rint; 1564 u_char *get, *end; 1565 u_int cc, scc; 1566 u_char rsr; 1567 int code; 1568 int s; 1569 1570 end = sc->sc_ebuf; 1571 get = sc->sc_rbget; 1572 scc = cc = plcom_rbuf_size - sc->sc_rbavail; 1573 1574 if (cc == plcom_rbuf_size) { 1575 sc->sc_floods++; 1576 if (sc->sc_errors++ == 0) 1577 callout_reset(&sc->sc_diag_callout, 60 * hz, 1578 plcomdiag, sc); 1579 } 1580 1581 while (cc) { 1582 code = get[0]; 1583 rsr = get[1]; 1584 if (ISSET(rsr, RSR_OE | RSR_BE | RSR_FE | RSR_PE)) { 1585 if (ISSET(rsr, RSR_OE)) { 1586 sc->sc_overflows++; 1587 if (sc->sc_errors++ == 0) 1588 callout_reset(&sc->sc_diag_callout, 1589 60 * hz, plcomdiag, sc); 1590 } 1591 if (ISSET(rsr, RSR_BE | RSR_FE)) 1592 SET(code, TTY_FE); 1593 if (ISSET(rsr, RSR_PE)) 1594 SET(code, TTY_PE); 1595 } 1596 if ((*rint)(code, tp) == -1) { 1597 /* 1598 * The line discipline's buffer is out of space. 1599 */ 1600 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1601 /* 1602 * We're either not using flow control, or the 1603 * line discipline didn't tell us to block for 1604 * some reason. Either way, we have no way to 1605 * know when there's more space available, so 1606 * just drop the rest of the data. 1607 */ 1608 get += cc << 1; 1609 if (get >= end) 1610 get -= plcom_rbuf_size << 1; 1611 cc = 0; 1612 } else { 1613 /* 1614 * Don't schedule any more receive processing 1615 * until the line discipline tells us there's 1616 * space available (through plcomhwiflow()). 1617 * Leave the rest of the data in the input 1618 * buffer. 1619 */ 1620 SET(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1621 } 1622 break; 1623 } 1624 get += 2; 1625 if (get >= end) 1626 get = sc->sc_rbuf; 1627 cc--; 1628 } 1629 1630 if (cc != scc) { 1631 sc->sc_rbget = get; 1632 s = splserial(); 1633 PLCOM_LOCK(sc); 1634 1635 cc = sc->sc_rbavail += scc - cc; 1636 /* Buffers should be ok again, release possible block. */ 1637 if (cc >= sc->sc_r_lowat) { 1638 if (ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1639 CLR(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1640 SET(sc->sc_cr, CR_RIE | CR_RTIE); 1641 bus_space_write_1(sc->sc_iot, sc->sc_ioh, plcom_cr, sc->sc_cr); 1642 } 1643 if (ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED)) { 1644 CLR(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1645 plcom_hwiflow(sc); 1646 } 1647 } 1648 PLCOM_UNLOCK(sc); 1649 splx(s); 1650 } 1651 } 1652 1653 integrate void 1654 plcom_txsoft(struct plcom_softc *sc, struct tty *tp) 1655 { 1656 1657 CLR(tp->t_state, TS_BUSY); 1658 if (ISSET(tp->t_state, TS_FLUSH)) 1659 CLR(tp->t_state, TS_FLUSH); 1660 else 1661 ndflush(&tp->t_outq, (int)(sc->sc_tba - tp->t_outq.c_cf)); 1662 (*tp->t_linesw->l_start)(tp); 1663 } 1664 1665 integrate void 1666 plcom_stsoft(struct plcom_softc *sc, struct tty *tp) 1667 { 1668 u_char msr, delta; 1669 int s; 1670 1671 s = splserial(); 1672 PLCOM_LOCK(sc); 1673 msr = sc->sc_msr; 1674 delta = sc->sc_msr_delta; 1675 sc->sc_msr_delta = 0; 1676 PLCOM_UNLOCK(sc); 1677 splx(s); 1678 1679 if (ISSET(delta, sc->sc_msr_dcd)) { 1680 /* 1681 * Inform the tty layer that carrier detect changed. 1682 */ 1683 (void) (*tp->t_linesw->l_modem)(tp, ISSET(msr, MSR_DCD)); 1684 } 1685 1686 if (ISSET(delta, sc->sc_msr_cts)) { 1687 /* Block or unblock output according to flow control. */ 1688 if (ISSET(msr, sc->sc_msr_cts)) { 1689 sc->sc_tx_stopped = 0; 1690 (*tp->t_linesw->l_start)(tp); 1691 } else { 1692 sc->sc_tx_stopped = 1; 1693 } 1694 } 1695 1696 #ifdef PLCOM_DEBUG 1697 if (plcom_debug) 1698 plcomstatus(sc, "plcom_stsoft"); 1699 #endif 1700 } 1701 1702 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 1703 void 1704 plcomsoft(void *arg) 1705 { 1706 struct plcom_softc *sc = arg; 1707 struct tty *tp; 1708 1709 if (PLCOM_ISALIVE(sc) == 0) 1710 return; 1711 1712 { 1713 #else 1714 void 1715 #ifndef __NO_SOFT_SERIAL_INTERRUPT 1716 plcomsoft(void) 1717 #else 1718 plcomsoft(void *arg) 1719 #endif 1720 { 1721 struct plcom_softc *sc; 1722 struct tty *tp; 1723 int unit; 1724 #ifdef __NO_SOFT_SERIAL_INTERRUPT 1725 int s; 1726 1727 s = splsoftserial(); 1728 plcom_softintr_scheduled = 0; 1729 #endif 1730 1731 for (unit = 0; unit < plcom_cd.cd_ndevs; unit++) { 1732 sc = device_lookup(&plcom_cd, unit); 1733 if (sc == NULL || !ISSET(sc->sc_hwflags, PLCOM_HW_DEV_OK)) 1734 continue; 1735 1736 if (PLCOM_ISALIVE(sc) == 0) 1737 continue; 1738 1739 tp = sc->sc_tty; 1740 if (tp == NULL) 1741 continue; 1742 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) 1743 continue; 1744 #endif 1745 tp = sc->sc_tty; 1746 1747 if (sc->sc_rx_ready) { 1748 sc->sc_rx_ready = 0; 1749 plcom_rxsoft(sc, tp); 1750 } 1751 1752 if (sc->sc_st_check) { 1753 sc->sc_st_check = 0; 1754 plcom_stsoft(sc, tp); 1755 } 1756 1757 if (sc->sc_tx_done) { 1758 sc->sc_tx_done = 0; 1759 plcom_txsoft(sc, tp); 1760 } 1761 } 1762 1763 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS 1764 #ifdef __NO_SOFT_SERIAL_INTERRUPT 1765 splx(s); 1766 #endif 1767 #endif 1768 } 1769 1770 #ifdef __ALIGN_BRACKET_LEVEL_FOR_CTAGS 1771 /* there has got to be a better way to do plcomsoft() */ 1772 }} 1773 #endif 1774 1775 int 1776 plcomintr(void *arg) 1777 { 1778 struct plcom_softc *sc = arg; 1779 bus_space_tag_t iot = sc->sc_iot; 1780 bus_space_handle_t ioh = sc->sc_ioh; 1781 u_char *put, *end; 1782 u_int cc; 1783 u_char rsr, iir; 1784 1785 if (PLCOM_ISALIVE(sc) == 0) 1786 return 0; 1787 1788 PLCOM_LOCK(sc); 1789 iir = bus_space_read_1(iot, ioh, plcom_iir); 1790 if (! ISSET(iir, IIR_IMASK)) { 1791 PLCOM_UNLOCK(sc); 1792 return 0; 1793 } 1794 1795 end = sc->sc_ebuf; 1796 put = sc->sc_rbput; 1797 cc = sc->sc_rbavail; 1798 1799 do { 1800 u_char msr, delta, fr; 1801 1802 fr = bus_space_read_1(iot, ioh, plcom_fr); 1803 1804 if (!ISSET(fr, FR_RXFE) && 1805 !ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1806 while (cc > 0) { 1807 int cn_trapped = 0; 1808 put[0] = bus_space_read_1(iot, ioh, 1809 plcom_dr); 1810 rsr = bus_space_read_1(iot, ioh, plcom_rsr); 1811 /* Clear any error status. */ 1812 if (ISSET(rsr, 1813 (RSR_BE | RSR_OE | RSR_PE | RSR_FE))) 1814 bus_space_write_1(iot, ioh, plcom_ecr, 1815 0); 1816 if (ISSET(rsr, RSR_BE)) { 1817 int cn_trapped = 0; 1818 cn_check_magic(sc->sc_tty->t_dev, 1819 CNC_BREAK, plcom_cnm_state); 1820 if (cn_trapped) 1821 continue; 1822 #if defined(KGDB) 1823 if (ISSET(sc->sc_hwflags, 1824 PLCOM_HW_KGDB)) { 1825 kgdb_connect(1); 1826 continue; 1827 } 1828 #endif 1829 } 1830 1831 put[1] = rsr; 1832 cn_check_magic(sc->sc_tty->t_dev, 1833 put[0], plcom_cnm_state); 1834 if (cn_trapped) { 1835 fr = bus_space_read_1(iot, ioh, 1836 plcom_fr); 1837 if (ISSET(fr, FR_RXFE)) 1838 break; 1839 1840 continue; 1841 } 1842 put += 2; 1843 if (put >= end) 1844 put = sc->sc_rbuf; 1845 cc--; 1846 1847 fr = bus_space_read_1(iot, ioh, plcom_fr); 1848 if (ISSET(fr, FR_RXFE)) 1849 break; 1850 } 1851 1852 /* 1853 * Current string of incoming characters ended because 1854 * no more data was available or we ran out of space. 1855 * Schedule a receive event if any data was received. 1856 * If we're out of space, turn off receive interrupts. 1857 */ 1858 sc->sc_rbput = put; 1859 sc->sc_rbavail = cc; 1860 if (!ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) 1861 sc->sc_rx_ready = 1; 1862 1863 /* 1864 * See if we are in danger of overflowing a buffer. If 1865 * so, use hardware flow control to ease the pressure. 1866 */ 1867 if (!ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED) && 1868 cc < sc->sc_r_hiwat) { 1869 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1870 plcom_hwiflow(sc); 1871 } 1872 1873 /* 1874 * If we're out of space, disable receive interrupts 1875 * until the queue has drained a bit. 1876 */ 1877 if (!cc) { 1878 SET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1879 CLR(sc->sc_cr, CR_RIE | CR_RTIE); 1880 bus_space_write_1(iot, ioh, plcom_cr, 1881 sc->sc_cr); 1882 } 1883 } else { 1884 if (ISSET(iir, IIR_RIS)) { 1885 bus_space_write_1(iot, ioh, plcom_cr, 0); 1886 delay(10); 1887 bus_space_write_1(iot, ioh, plcom_cr, 1888 sc->sc_cr); 1889 continue; 1890 } 1891 } 1892 1893 msr = bus_space_read_1(iot, ioh, plcom_fr); 1894 delta = msr ^ sc->sc_msr; 1895 sc->sc_msr = msr; 1896 /* Clear any pending modem status interrupt. */ 1897 if (iir & IIR_MIS) 1898 bus_space_write_1(iot, ioh, plcom_icr, 0); 1899 /* 1900 * Pulse-per-second (PSS) signals on edge of DCD? 1901 * Process these even if line discipline is ignoring DCD. 1902 */ 1903 if (delta & sc->sc_ppsmask) { 1904 struct timeval tv; 1905 if ((msr & sc->sc_ppsmask) == sc->sc_ppsassert) { 1906 /* XXX nanotime() */ 1907 microtime(&tv); 1908 TIMEVAL_TO_TIMESPEC(&tv, 1909 &sc->ppsinfo.assert_timestamp); 1910 if (sc->ppsparam.mode & PPS_OFFSETASSERT) { 1911 timespecadd(&sc->ppsinfo.assert_timestamp, 1912 &sc->ppsparam.assert_offset, 1913 &sc->ppsinfo.assert_timestamp); 1914 } 1915 1916 #ifdef PPS_SYNC 1917 if (sc->ppsparam.mode & PPS_HARDPPSONASSERT) 1918 hardpps(&tv, tv.tv_usec); 1919 #endif 1920 sc->ppsinfo.assert_sequence++; 1921 sc->ppsinfo.current_mode = sc->ppsparam.mode; 1922 1923 } else if ((msr & sc->sc_ppsmask) == sc->sc_ppsclear) { 1924 /* XXX nanotime() */ 1925 microtime(&tv); 1926 TIMEVAL_TO_TIMESPEC(&tv, 1927 &sc->ppsinfo.clear_timestamp); 1928 if (sc->ppsparam.mode & PPS_OFFSETCLEAR) { 1929 timespecadd(&sc->ppsinfo.clear_timestamp, 1930 &sc->ppsparam.clear_offset, 1931 &sc->ppsinfo.clear_timestamp); 1932 } 1933 1934 #ifdef PPS_SYNC 1935 if (sc->ppsparam.mode & PPS_HARDPPSONCLEAR) 1936 hardpps(&tv, tv.tv_usec); 1937 #endif 1938 sc->ppsinfo.clear_sequence++; 1939 sc->ppsinfo.current_mode = sc->ppsparam.mode; 1940 } 1941 } 1942 1943 /* 1944 * Process normal status changes 1945 */ 1946 if (ISSET(delta, sc->sc_msr_mask)) { 1947 SET(sc->sc_msr_delta, delta); 1948 1949 /* 1950 * Stop output immediately if we lose the output 1951 * flow control signal or carrier detect. 1952 */ 1953 if (ISSET(~msr, sc->sc_msr_mask)) { 1954 sc->sc_tbc = 0; 1955 sc->sc_heldtbc = 0; 1956 #ifdef PLCOM_DEBUG 1957 if (plcom_debug) 1958 plcomstatus(sc, "plcomintr "); 1959 #endif 1960 } 1961 1962 sc->sc_st_check = 1; 1963 } 1964 1965 /* 1966 * Done handling any receive interrupts. See if data 1967 * can be * transmitted as well. Schedule tx done 1968 * event if no data left * and tty was marked busy. 1969 */ 1970 if (ISSET(iir, IIR_TIS)) { 1971 /* 1972 * If we've delayed a parameter change, do it 1973 * now, and restart * output. 1974 */ 1975 if (sc->sc_heldchange) { 1976 plcom_loadchannelregs(sc); 1977 sc->sc_heldchange = 0; 1978 sc->sc_tbc = sc->sc_heldtbc; 1979 sc->sc_heldtbc = 0; 1980 } 1981 1982 /* 1983 * Output the next chunk of the contiguous 1984 * buffer, if any. 1985 */ 1986 if (sc->sc_tbc > 0) { 1987 int n; 1988 1989 n = sc->sc_tbc; 1990 if (n > sc->sc_fifolen) 1991 n = sc->sc_fifolen; 1992 bus_space_write_multi_1(iot, ioh, plcom_dr, 1993 sc->sc_tba, n); 1994 sc->sc_tbc -= n; 1995 sc->sc_tba += n; 1996 } else { 1997 /* 1998 * Disable transmit plcompletion 1999 * interrupts if necessary. 2000 */ 2001 if (ISSET(sc->sc_cr, CR_TIE)) { 2002 CLR(sc->sc_cr, CR_TIE); 2003 bus_space_write_1(iot, ioh, plcom_cr, 2004 sc->sc_cr); 2005 } 2006 if (sc->sc_tx_busy) { 2007 sc->sc_tx_busy = 0; 2008 sc->sc_tx_done = 1; 2009 } 2010 } 2011 } 2012 } while (ISSET((iir = bus_space_read_1(iot, ioh, plcom_iir)), 2013 IIR_IMASK)); 2014 2015 PLCOM_UNLOCK(sc); 2016 2017 /* Wake up the poller. */ 2018 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 2019 softintr_schedule(sc->sc_si); 2020 #else 2021 #ifndef __NO_SOFT_SERIAL_INTERRUPT 2022 setsoftserial(); 2023 #else 2024 if (!plcom_softintr_scheduled) { 2025 plcom_softintr_scheduled = 1; 2026 callout_reset(&plcomsoft_callout, 1, plcomsoft, NULL); 2027 } 2028 #endif 2029 #endif 2030 2031 #if NRND > 0 && defined(RND_COM) 2032 rnd_add_uint32(&sc->rnd_source, iir | rsr); 2033 #endif 2034 2035 return 1; 2036 } 2037 2038 /* 2039 * The following functions are polled getc and putc routines, shared 2040 * by the console and kgdb glue. 2041 * 2042 * The read-ahead code is so that you can detect pending in-band 2043 * cn_magic in polled mode while doing output rather than having to 2044 * wait until the kernel decides it needs input. 2045 */ 2046 2047 #define MAX_READAHEAD 20 2048 static int plcom_readahead[MAX_READAHEAD]; 2049 static int plcom_readaheadcount = 0; 2050 2051 int 2052 plcom_common_getc(dev_t dev, bus_space_tag_t iot, bus_space_handle_t ioh) 2053 { 2054 int s = splserial(); 2055 u_char stat, c; 2056 2057 /* got a character from reading things earlier */ 2058 if (plcom_readaheadcount > 0) { 2059 int i; 2060 2061 c = plcom_readahead[0]; 2062 for (i = 1; i < plcom_readaheadcount; i++) { 2063 plcom_readahead[i-1] = plcom_readahead[i]; 2064 } 2065 plcom_readaheadcount--; 2066 splx(s); 2067 return c; 2068 } 2069 2070 /* block until a character becomes available */ 2071 while (ISSET(stat = bus_space_read_1(iot, ioh, plcom_fr), FR_RXFE)) 2072 ; 2073 2074 c = bus_space_read_1(iot, ioh, plcom_dr); 2075 stat = bus_space_read_1(iot, ioh, plcom_iir); 2076 { 2077 int cn_trapped = 0; /* unused */ 2078 #ifdef DDB 2079 extern int db_active; 2080 if (!db_active) 2081 #endif 2082 cn_check_magic(dev, c, plcom_cnm_state); 2083 } 2084 splx(s); 2085 return c; 2086 } 2087 2088 void 2089 plcom_common_putc(dev_t dev, bus_space_tag_t iot, bus_space_handle_t ioh, 2090 int c) 2091 { 2092 int s = splserial(); 2093 int timo; 2094 2095 int cin, stat; 2096 if (plcom_readaheadcount < MAX_READAHEAD 2097 && !ISSET(stat = bus_space_read_1(iot, ioh, plcom_fr), FR_RXFE)) { 2098 int cn_trapped = 0; 2099 cin = bus_space_read_1(iot, ioh, plcom_dr); 2100 stat = bus_space_read_1(iot, ioh, plcom_iir); 2101 cn_check_magic(dev, cin, plcom_cnm_state); 2102 plcom_readahead[plcom_readaheadcount++] = cin; 2103 } 2104 2105 /* wait for any pending transmission to finish */ 2106 timo = 150000; 2107 while (!ISSET(bus_space_read_1(iot, ioh, plcom_fr), FR_TXFE) && --timo) 2108 continue; 2109 2110 bus_space_write_1(iot, ioh, plcom_dr, c); 2111 PLCOM_BARRIER(iot, ioh, BR | BW); 2112 2113 /* wait for this transmission to complete */ 2114 timo = 1500000; 2115 while (!ISSET(bus_space_read_1(iot, ioh, plcom_fr), FR_TXFE) && --timo) 2116 continue; 2117 2118 splx(s); 2119 } 2120 2121 /* 2122 * Initialize UART for use as console or KGDB line. 2123 */ 2124 int 2125 plcominit(bus_space_tag_t iot, bus_addr_t iobase, int rate, int frequency, 2126 tcflag_t cflag, bus_space_handle_t *iohp) 2127 { 2128 bus_space_handle_t ioh; 2129 2130 if (bus_space_map(iot, iobase, PLCOM_UART_SIZE, 0, &ioh)) 2131 return ENOMEM; /* ??? */ 2132 2133 rate = plcomspeed(rate, frequency); 2134 bus_space_write_1(iot, ioh, plcom_cr, 0); 2135 bus_space_write_1(iot, ioh, plcom_dlbl, rate); 2136 bus_space_write_1(iot, ioh, plcom_dlbh, rate >> 8); 2137 bus_space_write_1(iot, ioh, plcom_lcr, cflag2lcr(cflag) | LCR_FEN); 2138 bus_space_write_1(iot, ioh, plcom_cr, CR_UARTEN); 2139 2140 #if 0 2141 /* Ought to do something like this, but we have no sc to 2142 dereference. */ 2143 sc->sc_set_mcr(sc->sc_set_mcr_arg, sc->sc_dev.dv_unit, 2144 MCR_DTR | MCR_RTS); 2145 #endif 2146 2147 *iohp = ioh; 2148 return 0; 2149 } 2150 2151 /* 2152 * Following are all routines needed for PLCOM to act as console 2153 */ 2154 struct consdev plcomcons = { 2155 NULL, NULL, plcomcngetc, plcomcnputc, plcomcnpollc, NULL, 2156 NODEV, CN_NORMAL 2157 }; 2158 2159 2160 int 2161 plcomcnattach(bus_space_tag_t iot, bus_addr_t iobase, int rate, int frequency, 2162 tcflag_t cflag, int unit) 2163 { 2164 int res; 2165 2166 res = plcominit(iot, iobase, rate, frequency, cflag, &plcomconsioh); 2167 if (res) 2168 return res; 2169 2170 cn_tab = &plcomcons; 2171 cn_init_magic(&plcom_cnm_state); 2172 cn_set_magic("\047\001"); /* default magic is BREAK */ 2173 2174 plcomconstag = iot; 2175 plcomconsunit = unit; 2176 plcomconsrate = rate; 2177 plcomconscflag = cflag; 2178 2179 return 0; 2180 } 2181 2182 void 2183 plcomcndetach(void) 2184 { 2185 bus_space_unmap(plcomconstag, plcomconsioh, PLCOM_UART_SIZE); 2186 plcomconstag = NULL; 2187 2188 cn_tab = NULL; 2189 } 2190 2191 int 2192 plcomcngetc(dev_t dev) 2193 { 2194 return plcom_common_getc(dev, plcomconstag, plcomconsioh); 2195 } 2196 2197 /* 2198 * Console kernel output character routine. 2199 */ 2200 void 2201 plcomcnputc(dev_t dev, int c) 2202 { 2203 plcom_common_putc(dev, plcomconstag, plcomconsioh, c); 2204 } 2205 2206 void 2207 plcomcnpollc(dev_t dev, int on) 2208 { 2209 2210 } 2211 2212 #ifdef KGDB 2213 int 2214 plcom_kgdb_attach(bus_space_tag_t iot, bus_addr_t iobase, int rate, 2215 int frequency, tcflag_t cflag, int unit) 2216 { 2217 int res; 2218 2219 if (iot == plcomconstag && iobase == plcomconsunit) 2220 return EBUSY; /* cannot share with console */ 2221 2222 res = plcominit(iot, iobase, rate, frequency, cflag, &plcom_kgdb_ioh); 2223 if (res) 2224 return res; 2225 2226 kgdb_attach(plcom_kgdb_getc, plcom_kgdb_putc, NULL); 2227 kgdb_dev = 123; /* unneeded, only to satisfy some tests */ 2228 2229 plcom_kgdb_iot = iot; 2230 plcom_kgdb_unit = unit; 2231 2232 return 0; 2233 } 2234 2235 /* ARGSUSED */ 2236 int 2237 plcom_kgdb_getc(void *arg) 2238 { 2239 return plcom_common_getc(NODEV, plcom_kgdb_iot, plcom_kgdb_ioh); 2240 } 2241 2242 /* ARGSUSED */ 2243 void 2244 plcom_kgdb_putc(void *arg, int c) 2245 { 2246 plcom_common_putc(NODEV, plcom_kgdb_iot, plcom_kgdb_ioh, c); 2247 } 2248 #endif /* KGDB */ 2249 2250 /* helper function to identify the plcom ports used by 2251 console or KGDB (and not yet autoconf attached) */ 2252 int 2253 plcom_is_console(bus_space_tag_t iot, int unit, 2254 bus_space_handle_t *ioh) 2255 { 2256 bus_space_handle_t help; 2257 2258 if (!plcomconsattached && 2259 iot == plcomconstag && unit == plcomconsunit) 2260 help = plcomconsioh; 2261 #ifdef KGDB 2262 else if (!plcom_kgdb_attached && 2263 iot == plcom_kgdb_iot && unit == plcom_kgdb_unit) 2264 help = plcom_kgdb_ioh; 2265 #endif 2266 else 2267 return 0; 2268 2269 if (ioh) 2270 *ioh = help; 2271 return 1; 2272 } 2273
Indexes created Wed Sep 24 05:09:52 GMT 2025