plcom.c revision 1.10
1 /* $NetBSD: plcom.c,v 1.10 2005/06/04 13:38:08 rearnsha Exp $ */ 2 3 /*- 4 * Copyright (c) 2001 ARM Ltd 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the company may not be used to endorse or promote 16 * products derived from this software without specific prior written 17 * permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 20 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 21 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 23 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 24 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 25 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * Copyright (c) 1998, 1999 The NetBSD Foundation, Inc. 32 * All rights reserved. 33 * 34 * This code is derived from software contributed to The NetBSD Foundation 35 * by Charles M. Hannum. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. All advertising materials mentioning features or use of this software 46 * must display the following acknowledgement: 47 * This product includes software developed by the NetBSD 48 * Foundation, Inc. and its contributors. 49 * 4. Neither the name of The NetBSD Foundation nor the names of its 50 * contributors may be used to endorse or promote products derived 51 * from this software without specific prior written permission. 52 * 53 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 54 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 55 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 56 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 57 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 58 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 59 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 60 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 61 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 62 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 63 * POSSIBILITY OF SUCH DAMAGE. 64 */ 65 66 /* 67 * Copyright (c) 1991 The Regents of the University of California. 68 * All rights reserved. 69 * 70 * Redistribution and use in source and binary forms, with or without 71 * modification, are permitted provided that the following conditions 72 * are met: 73 * 1. Redistributions of source code must retain the above copyright 74 * notice, this list of conditions and the following disclaimer. 75 * 2. Redistributions in binary form must reproduce the above copyright 76 * notice, this list of conditions and the following disclaimer in the 77 * documentation and/or other materials provided with the distribution. 78 * 3. Neither the name of the University nor the names of its contributors 79 * may be used to endorse or promote products derived from this software 80 * without specific prior written permission. 81 * 82 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 83 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 84 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 85 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 86 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 87 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 88 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 89 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 90 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 91 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 92 * SUCH DAMAGE. 93 * 94 * @(#)com.c 7.5 (Berkeley) 5/16/91 95 */ 96 97 /* 98 * COM driver for the Prime Cell PL010 UART, which is similar to the 16C550, 99 * but has a completely different programmer's model. 100 * Derived from the NS16550AF com driver. 101 */ 102 103 #include <sys/cdefs.h> 104 __KERNEL_RCSID(0, "$NetBSD: plcom.c,v 1.10 2005/06/04 13:38:08 rearnsha Exp $"); 105 106 #include "opt_plcom.h" 107 #include "opt_ddb.h" 108 #include "opt_kgdb.h" 109 #include "opt_lockdebug.h" 110 #include "opt_multiprocessor.h" 111 112 #include "rnd.h" 113 #if NRND > 0 && defined(RND_COM) 114 #include <sys/rnd.h> 115 #endif 116 117 /* 118 * Override cnmagic(9) macro before including <sys/systm.h>. 119 * We need to know if cn_check_magic triggered debugger, so set a flag. 120 * Callers of cn_check_magic must declare int cn_trapped = 0; 121 * XXX: this is *ugly*! 122 */ 123 #define cn_trap() \ 124 do { \ 125 console_debugger(); \ 126 cn_trapped = 1; \ 127 } while (/* CONSTCOND */ 0) 128 129 #include <sys/param.h> 130 #include <sys/systm.h> 131 #include <sys/ioctl.h> 132 #include <sys/select.h> 133 #include <sys/tty.h> 134 #include <sys/proc.h> 135 #include <sys/user.h> 136 #include <sys/conf.h> 137 #include <sys/file.h> 138 #include <sys/uio.h> 139 #include <sys/kernel.h> 140 #include <sys/syslog.h> 141 #include <sys/types.h> 142 #include <sys/device.h> 143 #include <sys/malloc.h> 144 #include <sys/timepps.h> 145 #include <sys/vnode.h> 146 147 #include <machine/intr.h> 148 #include <machine/bus.h> 149 150 #include <evbarm/dev/plcomreg.h> 151 #include <evbarm/dev/plcomvar.h> 152 153 #include <dev/cons.h> 154 155 static void plcom_enable_debugport (struct plcom_softc *); 156 157 void plcom_config (struct plcom_softc *); 158 void plcom_shutdown (struct plcom_softc *); 159 int plcomspeed (long, long); 160 static u_char cflag2lcr (tcflag_t); 161 int plcomparam (struct tty *, struct termios *); 162 void plcomstart (struct tty *); 163 int plcomhwiflow (struct tty *, int); 164 165 void plcom_loadchannelregs (struct plcom_softc *); 166 void plcom_hwiflow (struct plcom_softc *); 167 void plcom_break (struct plcom_softc *, int); 168 void plcom_modem (struct plcom_softc *, int); 169 void tiocm_to_plcom (struct plcom_softc *, u_long, int); 170 int plcom_to_tiocm (struct plcom_softc *); 171 void plcom_iflush (struct plcom_softc *); 172 173 int plcom_common_getc (dev_t, bus_space_tag_t, bus_space_handle_t); 174 void plcom_common_putc (dev_t, bus_space_tag_t, bus_space_handle_t, int); 175 176 int plcominit (bus_space_tag_t, bus_addr_t, int, int, tcflag_t, 177 bus_space_handle_t *); 178 179 dev_type_open(plcomopen); 180 dev_type_close(plcomclose); 181 dev_type_read(plcomread); 182 dev_type_write(plcomwrite); 183 dev_type_ioctl(plcomioctl); 184 dev_type_stop(plcomstop); 185 dev_type_tty(plcomtty); 186 dev_type_poll(plcompoll); 187 188 int plcomcngetc (dev_t); 189 void plcomcnputc (dev_t, int); 190 void plcomcnpollc (dev_t, int); 191 192 #define integrate static inline 193 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 194 void plcomsoft (void *); 195 #else 196 #ifndef __NO_SOFT_SERIAL_INTERRUPT 197 void plcomsoft (void); 198 #else 199 void plcomsoft (void *); 200 struct callout plcomsoft_callout = CALLOUT_INITIALIZER; 201 #endif 202 #endif 203 integrate void plcom_rxsoft (struct plcom_softc *, struct tty *); 204 integrate void plcom_txsoft (struct plcom_softc *, struct tty *); 205 integrate void plcom_stsoft (struct plcom_softc *, struct tty *); 206 integrate void plcom_schedrx (struct plcom_softc *); 207 void plcomdiag (void *); 208 209 extern struct cfdriver plcom_cd; 210 211 const struct cdevsw plcom_cdevsw = { 212 plcomopen, plcomclose, plcomread, plcomwrite, plcomioctl, 213 plcomstop, plcomtty, plcompoll, nommap, ttykqfilter, D_TTY 214 }; 215 216 /* 217 * Make this an option variable one can patch. 218 * But be warned: this must be a power of 2! 219 */ 220 u_int plcom_rbuf_size = PLCOM_RING_SIZE; 221 222 /* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */ 223 u_int plcom_rbuf_hiwat = (PLCOM_RING_SIZE * 1) / 4; 224 u_int plcom_rbuf_lowat = (PLCOM_RING_SIZE * 3) / 4; 225 226 static int plcomconsunit = -1; 227 static bus_space_tag_t plcomconstag; 228 static bus_space_handle_t plcomconsioh; 229 static int plcomconsattached; 230 static int plcomconsrate; 231 static tcflag_t plcomconscflag; 232 static struct cnm_state plcom_cnm_state; 233 234 static int ppscap = 235 PPS_TSFMT_TSPEC | 236 PPS_CAPTUREASSERT | 237 PPS_CAPTURECLEAR | 238 #ifdef PPS_SYNC 239 PPS_HARDPPSONASSERT | PPS_HARDPPSONCLEAR | 240 #endif /* PPS_SYNC */ 241 PPS_OFFSETASSERT | PPS_OFFSETCLEAR; 242 243 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS 244 #ifdef __NO_SOFT_SERIAL_INTERRUPT 245 volatile int plcom_softintr_scheduled; 246 #endif 247 #endif 248 249 #ifdef KGDB 250 #include <sys/kgdb.h> 251 252 static int plcom_kgdb_unit; 253 static bus_space_tag_t plcom_kgdb_iot; 254 static bus_space_handle_t plcom_kgdb_ioh; 255 static int plcom_kgdb_attached; 256 257 int plcom_kgdb_getc (void *); 258 void plcom_kgdb_putc (void *, int); 259 #endif /* KGDB */ 260 261 #define PLCOMUNIT_MASK 0x7ffff 262 #define PLCOMDIALOUT_MASK 0x80000 263 264 #define PLCOMUNIT(x) (minor(x) & PLCOMUNIT_MASK) 265 #define PLCOMDIALOUT(x) (minor(x) & PLCOMDIALOUT_MASK) 266 267 #define PLCOM_ISALIVE(sc) ((sc)->enabled != 0 && \ 268 ISSET((sc)->sc_dev.dv_flags, DVF_ACTIVE)) 269 270 #define BR BUS_SPACE_BARRIER_READ 271 #define BW BUS_SPACE_BARRIER_WRITE 272 #define PLCOM_BARRIER(t, h, f) bus_space_barrier((t), (h), 0, PLCOM_UART_SIZE, (f)) 273 274 #if (defined(MULTIPROCESSOR) || defined(LOCKDEBUG)) && defined(PLCOM_MPLOCK) 275 276 #define PLCOM_LOCK(sc) simple_lock(&(sc)->sc_lock) 277 #define PLCOM_UNLOCK(sc) simple_unlock(&(sc)->sc_lock) 278 279 #else 280 281 #define PLCOM_LOCK(sc) 282 #define PLCOM_UNLOCK(sc) 283 284 #endif 285 286 int 287 plcomspeed(long speed, long frequency) 288 { 289 #define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */ 290 291 int x, err; 292 293 #if 0 294 if (speed == 0) 295 return 0; 296 #endif 297 if (speed <= 0) 298 return -1; 299 x = divrnd(frequency / 16, speed); 300 if (x <= 0) 301 return -1; 302 err = divrnd(((quad_t)frequency) * 1000 / 16, speed * x) - 1000; 303 if (err < 0) 304 err = -err; 305 if (err > PLCOM_TOLERANCE) 306 return -1; 307 return x; 308 309 #undef divrnd 310 } 311 312 #ifdef PLCOM_DEBUG 313 int plcom_debug = 0; 314 315 void plcomstatus (struct plcom_softc *, char *); 316 void 317 plcomstatus(struct plcom_softc *sc, char *str) 318 { 319 struct tty *tp = sc->sc_tty; 320 321 printf("%s: %s %sclocal %sdcd %sts_carr_on %sdtr %stx_stopped\n", 322 sc->sc_dev.dv_xname, str, 323 ISSET(tp->t_cflag, CLOCAL) ? "+" : "-", 324 ISSET(sc->sc_msr, MSR_DCD) ? "+" : "-", 325 ISSET(tp->t_state, TS_CARR_ON) ? "+" : "-", 326 ISSET(sc->sc_mcr, MCR_DTR) ? "+" : "-", 327 sc->sc_tx_stopped ? "+" : "-"); 328 329 printf("%s: %s %scrtscts %scts %sts_ttstop %srts %xrx_flags\n", 330 sc->sc_dev.dv_xname, str, 331 ISSET(tp->t_cflag, CRTSCTS) ? "+" : "-", 332 ISSET(sc->sc_msr, MSR_CTS) ? "+" : "-", 333 ISSET(tp->t_state, TS_TTSTOP) ? "+" : "-", 334 ISSET(sc->sc_mcr, MCR_RTS) ? "+" : "-", 335 sc->sc_rx_flags); 336 } 337 #endif 338 339 int 340 plcomprobe1(bus_space_tag_t iot, bus_space_handle_t ioh) 341 { 342 int data; 343 344 /* Disable the UART. */ 345 bus_space_write_1(iot, ioh, plcom_cr, 0); 346 /* Make sure the FIFO is off. */ 347 bus_space_write_1(iot, ioh, plcom_lcr, LCR_8BITS); 348 /* Disable interrupts. */ 349 bus_space_write_1(iot, ioh, plcom_iir, 0); 350 351 /* Make sure we swallow anything in the receiving register. */ 352 data = bus_space_read_1(iot, ioh, plcom_dr); 353 354 if (bus_space_read_1(iot, ioh, plcom_lcr) != LCR_8BITS) 355 return 0; 356 357 data = bus_space_read_1(iot, ioh, plcom_fr) & (FR_RXFF | FR_RXFE); 358 359 if (data != FR_RXFE) 360 return 0; 361 362 return 1; 363 } 364 365 static void 366 plcom_enable_debugport(struct plcom_softc *sc) 367 { 368 int s; 369 370 /* Turn on line break interrupt, set carrier. */ 371 s = splserial(); 372 PLCOM_LOCK(sc); 373 sc->sc_cr = CR_RIE | CR_RTIE | CR_UARTEN; 374 bus_space_write_1(sc->sc_iot, sc->sc_ioh, plcom_cr, sc->sc_cr); 375 SET(sc->sc_mcr, MCR_DTR | MCR_RTS); 376 sc->sc_set_mcr(sc->sc_set_mcr_arg, sc->sc_dev.dv_unit, sc->sc_mcr); 377 PLCOM_UNLOCK(sc); 378 splx(s); 379 } 380 381 void 382 plcom_attach_subr(struct plcom_softc *sc) 383 { 384 int unit = sc->sc_iounit; 385 bus_space_tag_t iot = sc->sc_iot; 386 bus_space_handle_t ioh = sc->sc_ioh; 387 struct tty *tp; 388 389 callout_init(&sc->sc_diag_callout); 390 #if (defined(MULTIPROCESSOR) || defined(LOCKDEBUG)) && defined(PLCOM_MPLOCK) 391 simple_lock_init(&sc->sc_lock); 392 #endif 393 394 /* Disable interrupts before configuring the device. */ 395 sc->sc_cr = 0; 396 397 if (plcomconstag && unit == plcomconsunit) { 398 plcomconsattached = 1; 399 400 plcomconstag = iot; 401 plcomconsioh = ioh; 402 403 /* Make sure the console is always "hardwired". */ 404 delay(1000); /* wait for output to finish */ 405 SET(sc->sc_hwflags, PLCOM_HW_CONSOLE); 406 SET(sc->sc_swflags, TIOCFLAG_SOFTCAR); 407 /* Must re-enable the console immediately, or we will 408 hang when trying to print. */ 409 sc->sc_cr = CR_UARTEN; 410 } 411 412 bus_space_write_1(iot, ioh, plcom_cr, sc->sc_cr); 413 414 /* The PL010 has a 16-byte fifo, but the tx interrupt triggers when 415 there is space for 8 more bytes. */ 416 sc->sc_fifolen = 8; 417 printf("\n"); 418 419 if (ISSET(sc->sc_hwflags, PLCOM_HW_TXFIFO_DISABLE)) { 420 sc->sc_fifolen = 1; 421 printf("%s: txfifo disabled\n", sc->sc_dev.dv_xname); 422 } 423 424 if (sc->sc_fifolen > 1) 425 SET(sc->sc_hwflags, PLCOM_HW_FIFO); 426 427 tp = ttymalloc(); 428 tp->t_oproc = plcomstart; 429 tp->t_param = plcomparam; 430 tp->t_hwiflow = plcomhwiflow; 431 432 sc->sc_tty = tp; 433 sc->sc_rbuf = malloc(plcom_rbuf_size << 1, M_DEVBUF, M_NOWAIT); 434 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 435 sc->sc_rbavail = plcom_rbuf_size; 436 if (sc->sc_rbuf == NULL) { 437 printf("%s: unable to allocate ring buffer\n", 438 sc->sc_dev.dv_xname); 439 return; 440 } 441 sc->sc_ebuf = sc->sc_rbuf + (plcom_rbuf_size << 1); 442 443 tty_attach(tp); 444 445 if (ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE)) { 446 int maj; 447 448 /* locate the major number */ 449 maj = cdevsw_lookup_major(&plcom_cdevsw); 450 451 cn_tab->cn_dev = makedev(maj, sc->sc_dev.dv_unit); 452 453 printf("%s: console\n", sc->sc_dev.dv_xname); 454 } 455 456 #ifdef KGDB 457 /* 458 * Allow kgdb to "take over" this port. If this is 459 * the kgdb device, it has exclusive use. 460 */ 461 if (iot == plcom_kgdb_iot && unit == plcom_kgdb_unit) { 462 plcom_kgdb_attached = 1; 463 464 SET(sc->sc_hwflags, PLCOM_HW_KGDB); 465 printf("%s: kgdb\n", sc->sc_dev.dv_xname); 466 } 467 #endif 468 469 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 470 sc->sc_si = softintr_establish(IPL_SOFTSERIAL, plcomsoft, sc); 471 #endif 472 473 #if NRND > 0 && defined(RND_COM) 474 rnd_attach_source(&sc->rnd_source, sc->sc_dev.dv_xname, 475 RND_TYPE_TTY, 0); 476 #endif 477 478 /* if there are no enable/disable functions, assume the device 479 is always enabled */ 480 if (!sc->enable) 481 sc->enabled = 1; 482 483 plcom_config(sc); 484 485 SET(sc->sc_hwflags, PLCOM_HW_DEV_OK); 486 } 487 488 void 489 plcom_config(struct plcom_softc *sc) 490 { 491 bus_space_tag_t iot = sc->sc_iot; 492 bus_space_handle_t ioh = sc->sc_ioh; 493 494 /* Disable interrupts before configuring the device. */ 495 sc->sc_cr = 0; 496 bus_space_write_1(iot, ioh, plcom_cr, sc->sc_cr); 497 498 if (ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE|PLCOM_HW_KGDB)) 499 plcom_enable_debugport(sc); 500 } 501 502 int 503 plcom_detach(self, flags) 504 struct device *self; 505 int flags; 506 { 507 struct plcom_softc *sc = (struct plcom_softc *)self; 508 int maj, mn; 509 510 /* locate the major number */ 511 maj = cdevsw_lookup_major(&plcom_cdevsw); 512 513 /* Nuke the vnodes for any open instances. */ 514 mn = self->dv_unit; 515 vdevgone(maj, mn, mn, VCHR); 516 517 mn |= PLCOMDIALOUT_MASK; 518 vdevgone(maj, mn, mn, VCHR); 519 520 /* Free the receive buffer. */ 521 free(sc->sc_rbuf, M_DEVBUF); 522 523 /* Detach and free the tty. */ 524 tty_detach(sc->sc_tty); 525 ttyfree(sc->sc_tty); 526 527 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 528 /* Unhook the soft interrupt handler. */ 529 softintr_disestablish(sc->sc_si); 530 #endif 531 532 #if NRND > 0 && defined(RND_COM) 533 /* Unhook the entropy source. */ 534 rnd_detach_source(&sc->rnd_source); 535 #endif 536 537 return 0; 538 } 539 540 int 541 plcom_activate(struct device *self, enum devact act) 542 { 543 struct plcom_softc *sc = (struct plcom_softc *)self; 544 int s, rv = 0; 545 546 s = splserial(); 547 PLCOM_LOCK(sc); 548 switch (act) { 549 case DVACT_ACTIVATE: 550 rv = EOPNOTSUPP; 551 break; 552 553 case DVACT_DEACTIVATE: 554 if (sc->sc_hwflags & (PLCOM_HW_CONSOLE|PLCOM_HW_KGDB)) { 555 rv = EBUSY; 556 break; 557 } 558 559 if (sc->disable != NULL && sc->enabled != 0) { 560 (*sc->disable)(sc); 561 sc->enabled = 0; 562 } 563 break; 564 } 565 566 PLCOM_UNLOCK(sc); 567 splx(s); 568 return rv; 569 } 570 571 void 572 plcom_shutdown(struct plcom_softc *sc) 573 { 574 struct tty *tp = sc->sc_tty; 575 int s; 576 577 s = splserial(); 578 PLCOM_LOCK(sc); 579 580 /* If we were asserting flow control, then deassert it. */ 581 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 582 plcom_hwiflow(sc); 583 584 /* Clear any break condition set with TIOCSBRK. */ 585 plcom_break(sc, 0); 586 587 /* Turn off PPS capture on last close. */ 588 sc->sc_ppsmask = 0; 589 sc->ppsparam.mode = 0; 590 591 /* 592 * Hang up if necessary. Wait a bit, so the other side has time to 593 * notice even if we immediately open the port again. 594 * Avoid tsleeping above splhigh(). 595 */ 596 if (ISSET(tp->t_cflag, HUPCL)) { 597 plcom_modem(sc, 0); 598 PLCOM_UNLOCK(sc); 599 splx(s); 600 /* XXX tsleep will only timeout */ 601 (void) tsleep(sc, TTIPRI, ttclos, hz); 602 s = splserial(); 603 PLCOM_LOCK(sc); 604 } 605 606 /* Turn off interrupts. */ 607 if (ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE)) 608 /* interrupt on break */ 609 sc->sc_cr = CR_RIE | CR_RTIE | CR_UARTEN; 610 else 611 sc->sc_cr = 0; 612 bus_space_write_1(sc->sc_iot, sc->sc_ioh, plcom_cr, sc->sc_cr); 613 614 if (sc->disable) { 615 #ifdef DIAGNOSTIC 616 if (!sc->enabled) 617 panic("plcom_shutdown: not enabled?"); 618 #endif 619 (*sc->disable)(sc); 620 sc->enabled = 0; 621 } 622 PLCOM_UNLOCK(sc); 623 splx(s); 624 } 625 626 int 627 plcomopen(dev_t dev, int flag, int mode, struct proc *p) 628 { 629 struct plcom_softc *sc; 630 struct tty *tp; 631 int s, s2; 632 int error; 633 634 sc = device_lookup(&plcom_cd, PLCOMUNIT(dev)); 635 if (sc == NULL || !ISSET(sc->sc_hwflags, PLCOM_HW_DEV_OK) || 636 sc->sc_rbuf == NULL) 637 return ENXIO; 638 639 if (ISSET(sc->sc_dev.dv_flags, DVF_ACTIVE) == 0) 640 return ENXIO; 641 642 #ifdef KGDB 643 /* 644 * If this is the kgdb port, no other use is permitted. 645 */ 646 if (ISSET(sc->sc_hwflags, PLCOM_HW_KGDB)) 647 return EBUSY; 648 #endif 649 650 tp = sc->sc_tty; 651 652 if (ISSET(tp->t_state, TS_ISOPEN) && 653 ISSET(tp->t_state, TS_XCLUDE) && 654 p->p_ucred->cr_uid != 0) 655 return EBUSY; 656 657 s = spltty(); 658 659 /* 660 * Do the following iff this is a first open. 661 */ 662 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 663 struct termios t; 664 665 tp->t_dev = dev; 666 667 s2 = splserial(); 668 PLCOM_LOCK(sc); 669 670 if (sc->enable) { 671 if ((*sc->enable)(sc)) { 672 PLCOM_UNLOCK(sc); 673 splx(s2); 674 splx(s); 675 printf("%s: device enable failed\n", 676 sc->sc_dev.dv_xname); 677 return EIO; 678 } 679 sc->enabled = 1; 680 plcom_config(sc); 681 } 682 683 /* Turn on interrupts. */ 684 /* IER_ERXRDY | IER_ERLS | IER_EMSC; */ 685 sc->sc_cr = CR_RIE | CR_RTIE | CR_MSIE | CR_UARTEN; 686 bus_space_write_1(sc->sc_iot, sc->sc_ioh, plcom_cr, sc->sc_cr); 687 688 /* Fetch the current modem control status, needed later. */ 689 sc->sc_msr = bus_space_read_1(sc->sc_iot, sc->sc_ioh, plcom_fr); 690 691 /* Clear PPS capture state on first open. */ 692 sc->sc_ppsmask = 0; 693 sc->ppsparam.mode = 0; 694 695 PLCOM_UNLOCK(sc); 696 splx(s2); 697 698 /* 699 * Initialize the termios status to the defaults. Add in the 700 * sticky bits from TIOCSFLAGS. 701 */ 702 t.c_ispeed = 0; 703 if (ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE)) { 704 t.c_ospeed = plcomconsrate; 705 t.c_cflag = plcomconscflag; 706 } else { 707 t.c_ospeed = TTYDEF_SPEED; 708 t.c_cflag = TTYDEF_CFLAG; 709 } 710 if (ISSET(sc->sc_swflags, TIOCFLAG_CLOCAL)) 711 SET(t.c_cflag, CLOCAL); 712 if (ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS)) 713 SET(t.c_cflag, CRTSCTS); 714 if (ISSET(sc->sc_swflags, TIOCFLAG_MDMBUF)) 715 SET(t.c_cflag, MDMBUF); 716 /* Make sure plcomparam() will do something. */ 717 tp->t_ospeed = 0; 718 (void) plcomparam(tp, &t); 719 tp->t_iflag = TTYDEF_IFLAG; 720 tp->t_oflag = TTYDEF_OFLAG; 721 tp->t_lflag = TTYDEF_LFLAG; 722 ttychars(tp); 723 ttsetwater(tp); 724 725 s2 = splserial(); 726 PLCOM_LOCK(sc); 727 728 /* 729 * Turn on DTR. We must always do this, even if carrier is not 730 * present, because otherwise we'd have to use TIOCSDTR 731 * immediately after setting CLOCAL, which applications do not 732 * expect. We always assert DTR while the device is open 733 * unless explicitly requested to deassert it. 734 */ 735 plcom_modem(sc, 1); 736 737 /* Clear the input ring, and unblock. */ 738 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 739 sc->sc_rbavail = plcom_rbuf_size; 740 plcom_iflush(sc); 741 CLR(sc->sc_rx_flags, RX_ANY_BLOCK); 742 plcom_hwiflow(sc); 743 744 #ifdef PLCOM_DEBUG 745 if (plcom_debug) 746 plcomstatus(sc, "plcomopen "); 747 #endif 748 749 PLCOM_UNLOCK(sc); 750 splx(s2); 751 } 752 753 splx(s); 754 755 error = ttyopen(tp, PLCOMDIALOUT(dev), ISSET(flag, O_NONBLOCK)); 756 if (error) 757 goto bad; 758 759 error = (*tp->t_linesw->l_open)(dev, tp); 760 if (error) 761 goto bad; 762 763 return 0; 764 765 bad: 766 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 767 /* 768 * We failed to open the device, and nobody else had it opened. 769 * Clean up the state as appropriate. 770 */ 771 plcom_shutdown(sc); 772 } 773 774 return error; 775 } 776 777 int 778 plcomclose(dev_t dev, int flag, int mode, struct proc *p) 779 { 780 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(dev)); 781 struct tty *tp = sc->sc_tty; 782 783 /* XXX This is for cons.c. */ 784 if (!ISSET(tp->t_state, TS_ISOPEN)) 785 return 0; 786 787 (*tp->t_linesw->l_close)(tp, flag); 788 ttyclose(tp); 789 790 if (PLCOM_ISALIVE(sc) == 0) 791 return 0; 792 793 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 794 /* 795 * Although we got a last close, the device may still be in 796 * use; e.g. if this was the dialout node, and there are still 797 * processes waiting for carrier on the non-dialout node. 798 */ 799 plcom_shutdown(sc); 800 } 801 802 return 0; 803 } 804 805 int 806 plcomread(dev_t dev, struct uio *uio, int flag) 807 { 808 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(dev)); 809 struct tty *tp = sc->sc_tty; 810 811 if (PLCOM_ISALIVE(sc) == 0) 812 return EIO; 813 814 return (*tp->t_linesw->l_read)(tp, uio, flag); 815 } 816 817 int 818 plcomwrite(dev_t dev, struct uio *uio, int flag) 819 { 820 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(dev)); 821 struct tty *tp = sc->sc_tty; 822 823 if (PLCOM_ISALIVE(sc) == 0) 824 return EIO; 825 826 return (*tp->t_linesw->l_write)(tp, uio, flag); 827 } 828 829 int 830 plcompoll(dev_t dev, int events, struct proc *p) 831 { 832 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(dev)); 833 struct tty *tp = sc->sc_tty; 834 835 if (PLCOM_ISALIVE(sc) == 0) 836 return EIO; 837 838 return (*tp->t_linesw->l_poll)(tp, events, p); 839 } 840 841 struct tty * 842 plcomtty(dev_t dev) 843 { 844 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(dev)); 845 struct tty *tp = sc->sc_tty; 846 847 return tp; 848 } 849 850 int 851 plcomioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p) 852 { 853 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(dev)); 854 struct tty *tp = sc->sc_tty; 855 int error; 856 int s; 857 858 if (PLCOM_ISALIVE(sc) == 0) 859 return EIO; 860 861 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, p); 862 if (error != EPASSTHROUGH) 863 return error; 864 865 error = ttioctl(tp, cmd, data, flag, p); 866 if (error != EPASSTHROUGH) 867 return error; 868 869 error = 0; 870 871 s = splserial(); 872 PLCOM_LOCK(sc); 873 874 switch (cmd) { 875 case TIOCSBRK: 876 plcom_break(sc, 1); 877 break; 878 879 case TIOCCBRK: 880 plcom_break(sc, 0); 881 break; 882 883 case TIOCSDTR: 884 plcom_modem(sc, 1); 885 break; 886 887 case TIOCCDTR: 888 plcom_modem(sc, 0); 889 break; 890 891 case TIOCGFLAGS: 892 *(int *)data = sc->sc_swflags; 893 break; 894 895 case TIOCSFLAGS: 896 error = suser(p->p_ucred, &p->p_acflag); 897 if (error) 898 break; 899 sc->sc_swflags = *(int *)data; 900 break; 901 902 case TIOCMSET: 903 case TIOCMBIS: 904 case TIOCMBIC: 905 tiocm_to_plcom(sc, cmd, *(int *)data); 906 break; 907 908 case TIOCMGET: 909 *(int *)data = plcom_to_tiocm(sc); 910 break; 911 912 case PPS_IOC_CREATE: 913 break; 914 915 case PPS_IOC_DESTROY: 916 break; 917 918 case PPS_IOC_GETPARAMS: { 919 pps_params_t *pp; 920 pp = (pps_params_t *)data; 921 *pp = sc->ppsparam; 922 break; 923 } 924 925 case PPS_IOC_SETPARAMS: { 926 pps_params_t *pp; 927 int mode; 928 pp = (pps_params_t *)data; 929 if (pp->mode & ~ppscap) { 930 error = EINVAL; 931 break; 932 } 933 sc->ppsparam = *pp; 934 /* 935 * Compute msr masks from user-specified timestamp state. 936 */ 937 mode = sc->ppsparam.mode; 938 #ifdef PPS_SYNC 939 if (mode & PPS_HARDPPSONASSERT) { 940 mode |= PPS_CAPTUREASSERT; 941 /* XXX revoke any previous HARDPPS source */ 942 } 943 if (mode & PPS_HARDPPSONCLEAR) { 944 mode |= PPS_CAPTURECLEAR; 945 /* XXX revoke any previous HARDPPS source */ 946 } 947 #endif /* PPS_SYNC */ 948 switch (mode & PPS_CAPTUREBOTH) { 949 case 0: 950 sc->sc_ppsmask = 0; 951 break; 952 953 case PPS_CAPTUREASSERT: 954 sc->sc_ppsmask = MSR_DCD; 955 sc->sc_ppsassert = MSR_DCD; 956 sc->sc_ppsclear = -1; 957 break; 958 959 case PPS_CAPTURECLEAR: 960 sc->sc_ppsmask = MSR_DCD; 961 sc->sc_ppsassert = -1; 962 sc->sc_ppsclear = 0; 963 break; 964 965 case PPS_CAPTUREBOTH: 966 sc->sc_ppsmask = MSR_DCD; 967 sc->sc_ppsassert = MSR_DCD; 968 sc->sc_ppsclear = 0; 969 break; 970 971 default: 972 error = EINVAL; 973 break; 974 } 975 break; 976 } 977 978 case PPS_IOC_GETCAP: 979 *(int*)data = ppscap; 980 break; 981 982 case PPS_IOC_FETCH: { 983 pps_info_t *pi; 984 pi = (pps_info_t *)data; 985 *pi = sc->ppsinfo; 986 break; 987 } 988 989 case TIOCDCDTIMESTAMP: /* XXX old, overloaded API used by xntpd v3 */ 990 /* 991 * Some GPS clocks models use the falling rather than 992 * rising edge as the on-the-second signal. 993 * The old API has no way to specify PPS polarity. 994 */ 995 sc->sc_ppsmask = MSR_DCD; 996 #ifndef PPS_TRAILING_EDGE 997 sc->sc_ppsassert = MSR_DCD; 998 sc->sc_ppsclear = -1; 999 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 1000 &sc->ppsinfo.assert_timestamp); 1001 #else 1002 sc->sc_ppsassert = -1 1003 sc->sc_ppsclear = 0; 1004 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 1005 &sc->ppsinfo.clear_timestamp); 1006 #endif 1007 break; 1008 1009 default: 1010 error = EPASSTHROUGH; 1011 break; 1012 } 1013 1014 PLCOM_UNLOCK(sc); 1015 splx(s); 1016 1017 #ifdef PLCOM_DEBUG 1018 if (plcom_debug) 1019 plcomstatus(sc, "plcomioctl "); 1020 #endif 1021 1022 return error; 1023 } 1024 1025 integrate void 1026 plcom_schedrx(struct plcom_softc *sc) 1027 { 1028 1029 sc->sc_rx_ready = 1; 1030 1031 /* Wake up the poller. */ 1032 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 1033 softintr_schedule(sc->sc_si); 1034 #else 1035 #ifndef __NO_SOFT_SERIAL_INTERRUPT 1036 setsoftserial(); 1037 #else 1038 if (!plcom_softintr_scheduled) { 1039 plcom_softintr_scheduled = 1; 1040 callout_reset(&plcomsoft_callout, 1, plcomsoft, NULL); 1041 } 1042 #endif 1043 #endif 1044 } 1045 1046 void 1047 plcom_break(struct plcom_softc *sc, int onoff) 1048 { 1049 1050 if (onoff) 1051 SET(sc->sc_lcr, LCR_BRK); 1052 else 1053 CLR(sc->sc_lcr, LCR_BRK); 1054 1055 if (!sc->sc_heldchange) { 1056 if (sc->sc_tx_busy) { 1057 sc->sc_heldtbc = sc->sc_tbc; 1058 sc->sc_tbc = 0; 1059 sc->sc_heldchange = 1; 1060 } else 1061 plcom_loadchannelregs(sc); 1062 } 1063 } 1064 1065 void 1066 plcom_modem(struct plcom_softc *sc, int onoff) 1067 { 1068 1069 if (sc->sc_mcr_dtr == 0) 1070 return; 1071 1072 if (onoff) 1073 SET(sc->sc_mcr, sc->sc_mcr_dtr); 1074 else 1075 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 1076 1077 if (!sc->sc_heldchange) { 1078 if (sc->sc_tx_busy) { 1079 sc->sc_heldtbc = sc->sc_tbc; 1080 sc->sc_tbc = 0; 1081 sc->sc_heldchange = 1; 1082 } else 1083 plcom_loadchannelregs(sc); 1084 } 1085 } 1086 1087 void 1088 tiocm_to_plcom(struct plcom_softc *sc, u_long how, int ttybits) 1089 { 1090 u_char plcombits; 1091 1092 plcombits = 0; 1093 if (ISSET(ttybits, TIOCM_DTR)) 1094 SET(plcombits, MCR_DTR); 1095 if (ISSET(ttybits, TIOCM_RTS)) 1096 SET(plcombits, MCR_RTS); 1097 1098 switch (how) { 1099 case TIOCMBIC: 1100 CLR(sc->sc_mcr, plcombits); 1101 break; 1102 1103 case TIOCMBIS: 1104 SET(sc->sc_mcr, plcombits); 1105 break; 1106 1107 case TIOCMSET: 1108 CLR(sc->sc_mcr, MCR_DTR | MCR_RTS); 1109 SET(sc->sc_mcr, plcombits); 1110 break; 1111 } 1112 1113 if (!sc->sc_heldchange) { 1114 if (sc->sc_tx_busy) { 1115 sc->sc_heldtbc = sc->sc_tbc; 1116 sc->sc_tbc = 0; 1117 sc->sc_heldchange = 1; 1118 } else 1119 plcom_loadchannelregs(sc); 1120 } 1121 } 1122 1123 int 1124 plcom_to_tiocm(struct plcom_softc *sc) 1125 { 1126 u_char plcombits; 1127 int ttybits = 0; 1128 1129 plcombits = sc->sc_mcr; 1130 if (ISSET(plcombits, MCR_DTR)) 1131 SET(ttybits, TIOCM_DTR); 1132 if (ISSET(plcombits, MCR_RTS)) 1133 SET(ttybits, TIOCM_RTS); 1134 1135 plcombits = sc->sc_msr; 1136 if (ISSET(plcombits, MSR_DCD)) 1137 SET(ttybits, TIOCM_CD); 1138 if (ISSET(plcombits, MSR_CTS)) 1139 SET(ttybits, TIOCM_CTS); 1140 if (ISSET(plcombits, MSR_DSR)) 1141 SET(ttybits, TIOCM_DSR); 1142 1143 if (sc->sc_cr != 0) 1144 SET(ttybits, TIOCM_LE); 1145 1146 return ttybits; 1147 } 1148 1149 static u_char 1150 cflag2lcr(tcflag_t cflag) 1151 { 1152 u_char lcr = 0; 1153 1154 switch (ISSET(cflag, CSIZE)) { 1155 case CS5: 1156 SET(lcr, LCR_5BITS); 1157 break; 1158 case CS6: 1159 SET(lcr, LCR_6BITS); 1160 break; 1161 case CS7: 1162 SET(lcr, LCR_7BITS); 1163 break; 1164 case CS8: 1165 SET(lcr, LCR_8BITS); 1166 break; 1167 } 1168 if (ISSET(cflag, PARENB)) { 1169 SET(lcr, LCR_PEN); 1170 if (!ISSET(cflag, PARODD)) 1171 SET(lcr, LCR_EPS); 1172 } 1173 if (ISSET(cflag, CSTOPB)) 1174 SET(lcr, LCR_STP2); 1175 1176 return lcr; 1177 } 1178 1179 int 1180 plcomparam(struct tty *tp, struct termios *t) 1181 { 1182 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(tp->t_dev)); 1183 int ospeed; 1184 u_char lcr; 1185 int s; 1186 1187 if (PLCOM_ISALIVE(sc) == 0) 1188 return EIO; 1189 1190 ospeed = plcomspeed(t->c_ospeed, sc->sc_frequency); 1191 1192 /* Check requested parameters. */ 1193 if (ospeed < 0) 1194 return EINVAL; 1195 if (t->c_ispeed && t->c_ispeed != t->c_ospeed) 1196 return EINVAL; 1197 1198 /* 1199 * For the console, always force CLOCAL and !HUPCL, so that the port 1200 * is always active. 1201 */ 1202 if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) || 1203 ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE)) { 1204 SET(t->c_cflag, CLOCAL); 1205 CLR(t->c_cflag, HUPCL); 1206 } 1207 1208 /* 1209 * If there were no changes, don't do anything. This avoids dropping 1210 * input and improves performance when all we did was frob things like 1211 * VMIN and VTIME. 1212 */ 1213 if (tp->t_ospeed == t->c_ospeed && 1214 tp->t_cflag == t->c_cflag) 1215 return 0; 1216 1217 lcr = ISSET(sc->sc_lcr, LCR_BRK) | cflag2lcr(t->c_cflag); 1218 1219 s = splserial(); 1220 PLCOM_LOCK(sc); 1221 1222 sc->sc_lcr = lcr; 1223 1224 /* 1225 * PL010 has a fixed-length FIFO trigger point. 1226 */ 1227 if (ISSET(sc->sc_hwflags, PLCOM_HW_FIFO)) 1228 sc->sc_fifo = 1; 1229 else 1230 sc->sc_fifo = 0; 1231 1232 if (sc->sc_fifo) 1233 SET(sc->sc_lcr, LCR_FEN); 1234 1235 /* 1236 * If we're not in a mode that assumes a connection is present, then 1237 * ignore carrier changes. 1238 */ 1239 if (ISSET(t->c_cflag, CLOCAL | MDMBUF)) 1240 sc->sc_msr_dcd = 0; 1241 else 1242 sc->sc_msr_dcd = MSR_DCD; 1243 /* 1244 * Set the flow control pins depending on the current flow control 1245 * mode. 1246 */ 1247 if (ISSET(t->c_cflag, CRTSCTS)) { 1248 sc->sc_mcr_dtr = MCR_DTR; 1249 sc->sc_mcr_rts = MCR_RTS; 1250 sc->sc_msr_cts = MSR_CTS; 1251 } else if (ISSET(t->c_cflag, MDMBUF)) { 1252 /* 1253 * For DTR/DCD flow control, make sure we don't toggle DTR for 1254 * carrier detection. 1255 */ 1256 sc->sc_mcr_dtr = 0; 1257 sc->sc_mcr_rts = MCR_DTR; 1258 sc->sc_msr_cts = MSR_DCD; 1259 } else { 1260 /* 1261 * If no flow control, then always set RTS. This will make 1262 * the other side happy if it mistakenly thinks we're doing 1263 * RTS/CTS flow control. 1264 */ 1265 sc->sc_mcr_dtr = MCR_DTR | MCR_RTS; 1266 sc->sc_mcr_rts = 0; 1267 sc->sc_msr_cts = 0; 1268 if (ISSET(sc->sc_mcr, MCR_DTR)) 1269 SET(sc->sc_mcr, MCR_RTS); 1270 else 1271 CLR(sc->sc_mcr, MCR_RTS); 1272 } 1273 sc->sc_msr_mask = sc->sc_msr_cts | sc->sc_msr_dcd; 1274 1275 #if 0 1276 if (ospeed == 0) 1277 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 1278 else 1279 SET(sc->sc_mcr, sc->sc_mcr_dtr); 1280 #endif 1281 1282 sc->sc_dlbl = ospeed; 1283 sc->sc_dlbh = ospeed >> 8; 1284 1285 /* And copy to tty. */ 1286 tp->t_ispeed = 0; 1287 tp->t_ospeed = t->c_ospeed; 1288 tp->t_cflag = t->c_cflag; 1289 1290 if (!sc->sc_heldchange) { 1291 if (sc->sc_tx_busy) { 1292 sc->sc_heldtbc = sc->sc_tbc; 1293 sc->sc_tbc = 0; 1294 sc->sc_heldchange = 1; 1295 } else 1296 plcom_loadchannelregs(sc); 1297 } 1298 1299 if (!ISSET(t->c_cflag, CHWFLOW)) { 1300 /* Disable the high water mark. */ 1301 sc->sc_r_hiwat = 0; 1302 sc->sc_r_lowat = 0; 1303 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1304 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1305 plcom_schedrx(sc); 1306 } 1307 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 1308 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 1309 plcom_hwiflow(sc); 1310 } 1311 } else { 1312 sc->sc_r_hiwat = plcom_rbuf_hiwat; 1313 sc->sc_r_lowat = plcom_rbuf_lowat; 1314 } 1315 1316 PLCOM_UNLOCK(sc); 1317 splx(s); 1318 1319 /* 1320 * Update the tty layer's idea of the carrier bit, in case we changed 1321 * CLOCAL or MDMBUF. We don't hang up here; we only do that by 1322 * explicit request. 1323 */ 1324 (void) (*tp->t_linesw->l_modem)(tp, ISSET(sc->sc_msr, MSR_DCD)); 1325 1326 #ifdef PLCOM_DEBUG 1327 if (plcom_debug) 1328 plcomstatus(sc, "plcomparam "); 1329 #endif 1330 1331 if (!ISSET(t->c_cflag, CHWFLOW)) { 1332 if (sc->sc_tx_stopped) { 1333 sc->sc_tx_stopped = 0; 1334 plcomstart(tp); 1335 } 1336 } 1337 1338 return 0; 1339 } 1340 1341 void 1342 plcom_iflush(struct plcom_softc *sc) 1343 { 1344 bus_space_tag_t iot = sc->sc_iot; 1345 bus_space_handle_t ioh = sc->sc_ioh; 1346 #ifdef DIAGNOSTIC 1347 int reg; 1348 #endif 1349 int timo; 1350 1351 #ifdef DIAGNOSTIC 1352 reg = 0xffff; 1353 #endif 1354 timo = 50000; 1355 /* flush any pending I/O */ 1356 while (! ISSET(bus_space_read_1(iot, ioh, plcom_fr), FR_RXFE) 1357 && --timo) 1358 #ifdef DIAGNOSTIC 1359 reg = 1360 #else 1361 (void) 1362 #endif 1363 bus_space_read_1(iot, ioh, plcom_dr); 1364 #ifdef DIAGNOSTIC 1365 if (!timo) 1366 printf("%s: plcom_iflush timeout %02x\n", sc->sc_dev.dv_xname, 1367 reg); 1368 #endif 1369 } 1370 1371 void 1372 plcom_loadchannelregs(struct plcom_softc *sc) 1373 { 1374 bus_space_tag_t iot = sc->sc_iot; 1375 bus_space_handle_t ioh = sc->sc_ioh; 1376 1377 /* XXXXX necessary? */ 1378 plcom_iflush(sc); 1379 1380 bus_space_write_1(iot, ioh, plcom_cr, 0); 1381 1382 bus_space_write_1(iot, ioh, plcom_dlbl, sc->sc_dlbl); 1383 bus_space_write_1(iot, ioh, plcom_dlbh, sc->sc_dlbh); 1384 bus_space_write_1(iot, ioh, plcom_lcr, sc->sc_lcr); 1385 sc->sc_set_mcr(sc->sc_set_mcr_arg, sc->sc_dev.dv_unit, 1386 sc->sc_mcr_active = sc->sc_mcr); 1387 1388 bus_space_write_1(iot, ioh, plcom_cr, sc->sc_cr); 1389 } 1390 1391 int 1392 plcomhwiflow(struct tty *tp, int block) 1393 { 1394 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(tp->t_dev)); 1395 int s; 1396 1397 if (PLCOM_ISALIVE(sc) == 0) 1398 return 0; 1399 1400 if (sc->sc_mcr_rts == 0) 1401 return 0; 1402 1403 s = splserial(); 1404 PLCOM_LOCK(sc); 1405 1406 if (block) { 1407 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1408 SET(sc->sc_rx_flags, RX_TTY_BLOCKED); 1409 plcom_hwiflow(sc); 1410 } 1411 } else { 1412 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1413 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1414 plcom_schedrx(sc); 1415 } 1416 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1417 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED); 1418 plcom_hwiflow(sc); 1419 } 1420 } 1421 1422 PLCOM_UNLOCK(sc); 1423 splx(s); 1424 return 1; 1425 } 1426 1427 /* 1428 * (un)block input via hw flowcontrol 1429 */ 1430 void 1431 plcom_hwiflow(struct plcom_softc *sc) 1432 { 1433 if (sc->sc_mcr_rts == 0) 1434 return; 1435 1436 if (ISSET(sc->sc_rx_flags, RX_ANY_BLOCK)) { 1437 CLR(sc->sc_mcr, sc->sc_mcr_rts); 1438 CLR(sc->sc_mcr_active, sc->sc_mcr_rts); 1439 } else { 1440 SET(sc->sc_mcr, sc->sc_mcr_rts); 1441 SET(sc->sc_mcr_active, sc->sc_mcr_rts); 1442 } 1443 sc->sc_set_mcr(sc->sc_set_mcr_arg, sc->sc_dev.dv_unit, 1444 sc->sc_mcr_active); 1445 } 1446 1447 1448 void 1449 plcomstart(struct tty *tp) 1450 { 1451 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(tp->t_dev)); 1452 bus_space_tag_t iot = sc->sc_iot; 1453 bus_space_handle_t ioh = sc->sc_ioh; 1454 int s; 1455 1456 if (PLCOM_ISALIVE(sc) == 0) 1457 return; 1458 1459 s = spltty(); 1460 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 1461 goto out; 1462 if (sc->sc_tx_stopped) 1463 goto out; 1464 1465 if (tp->t_outq.c_cc <= tp->t_lowat) { 1466 if (ISSET(tp->t_state, TS_ASLEEP)) { 1467 CLR(tp->t_state, TS_ASLEEP); 1468 wakeup(&tp->t_outq); 1469 } 1470 selwakeup(&tp->t_wsel); 1471 if (tp->t_outq.c_cc == 0) 1472 goto out; 1473 } 1474 1475 /* Grab the first contiguous region of buffer space. */ 1476 { 1477 u_char *tba; 1478 int tbc; 1479 1480 tba = tp->t_outq.c_cf; 1481 tbc = ndqb(&tp->t_outq, 0); 1482 1483 (void)splserial(); 1484 PLCOM_LOCK(sc); 1485 1486 sc->sc_tba = tba; 1487 sc->sc_tbc = tbc; 1488 } 1489 1490 SET(tp->t_state, TS_BUSY); 1491 sc->sc_tx_busy = 1; 1492 1493 /* Enable transmit completion interrupts if necessary. */ 1494 if (!ISSET(sc->sc_cr, CR_TIE)) { 1495 SET(sc->sc_cr, CR_TIE); 1496 bus_space_write_1(iot, ioh, plcom_cr, sc->sc_cr); 1497 } 1498 1499 /* Output the first chunk of the contiguous buffer. */ 1500 { 1501 int n; 1502 1503 n = sc->sc_tbc; 1504 if (n > sc->sc_fifolen) 1505 n = sc->sc_fifolen; 1506 bus_space_write_multi_1(iot, ioh, plcom_dr, sc->sc_tba, n); 1507 sc->sc_tbc -= n; 1508 sc->sc_tba += n; 1509 } 1510 PLCOM_UNLOCK(sc); 1511 out: 1512 splx(s); 1513 return; 1514 } 1515 1516 /* 1517 * Stop output on a line. 1518 */ 1519 void 1520 plcomstop(struct tty *tp, int flag) 1521 { 1522 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(tp->t_dev)); 1523 int s; 1524 1525 s = splserial(); 1526 PLCOM_LOCK(sc); 1527 if (ISSET(tp->t_state, TS_BUSY)) { 1528 /* Stop transmitting at the next chunk. */ 1529 sc->sc_tbc = 0; 1530 sc->sc_heldtbc = 0; 1531 if (!ISSET(tp->t_state, TS_TTSTOP)) 1532 SET(tp->t_state, TS_FLUSH); 1533 } 1534 PLCOM_UNLOCK(sc); 1535 splx(s); 1536 } 1537 1538 void 1539 plcomdiag(void *arg) 1540 { 1541 struct plcom_softc *sc = arg; 1542 int overflows, floods; 1543 int s; 1544 1545 s = splserial(); 1546 PLCOM_LOCK(sc); 1547 overflows = sc->sc_overflows; 1548 sc->sc_overflows = 0; 1549 floods = sc->sc_floods; 1550 sc->sc_floods = 0; 1551 sc->sc_errors = 0; 1552 PLCOM_UNLOCK(sc); 1553 splx(s); 1554 1555 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1556 sc->sc_dev.dv_xname, 1557 overflows, overflows == 1 ? "" : "s", 1558 floods, floods == 1 ? "" : "s"); 1559 } 1560 1561 integrate void 1562 plcom_rxsoft(struct plcom_softc *sc, struct tty *tp) 1563 { 1564 int (*rint) (int, struct tty *) = tp->t_linesw->l_rint; 1565 u_char *get, *end; 1566 u_int cc, scc; 1567 u_char rsr; 1568 int code; 1569 int s; 1570 1571 end = sc->sc_ebuf; 1572 get = sc->sc_rbget; 1573 scc = cc = plcom_rbuf_size - sc->sc_rbavail; 1574 1575 if (cc == plcom_rbuf_size) { 1576 sc->sc_floods++; 1577 if (sc->sc_errors++ == 0) 1578 callout_reset(&sc->sc_diag_callout, 60 * hz, 1579 plcomdiag, sc); 1580 } 1581 1582 while (cc) { 1583 code = get[0]; 1584 rsr = get[1]; 1585 if (ISSET(rsr, RSR_OE | RSR_BE | RSR_FE | RSR_PE)) { 1586 if (ISSET(rsr, RSR_OE)) { 1587 sc->sc_overflows++; 1588 if (sc->sc_errors++ == 0) 1589 callout_reset(&sc->sc_diag_callout, 1590 60 * hz, plcomdiag, sc); 1591 } 1592 if (ISSET(rsr, RSR_BE | RSR_FE)) 1593 SET(code, TTY_FE); 1594 if (ISSET(rsr, RSR_PE)) 1595 SET(code, TTY_PE); 1596 } 1597 if ((*rint)(code, tp) == -1) { 1598 /* 1599 * The line discipline's buffer is out of space. 1600 */ 1601 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1602 /* 1603 * We're either not using flow control, or the 1604 * line discipline didn't tell us to block for 1605 * some reason. Either way, we have no way to 1606 * know when there's more space available, so 1607 * just drop the rest of the data. 1608 */ 1609 get += cc << 1; 1610 if (get >= end) 1611 get -= plcom_rbuf_size << 1; 1612 cc = 0; 1613 } else { 1614 /* 1615 * Don't schedule any more receive processing 1616 * until the line discipline tells us there's 1617 * space available (through plcomhwiflow()). 1618 * Leave the rest of the data in the input 1619 * buffer. 1620 */ 1621 SET(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1622 } 1623 break; 1624 } 1625 get += 2; 1626 if (get >= end) 1627 get = sc->sc_rbuf; 1628 cc--; 1629 } 1630 1631 if (cc != scc) { 1632 sc->sc_rbget = get; 1633 s = splserial(); 1634 PLCOM_LOCK(sc); 1635 1636 cc = sc->sc_rbavail += scc - cc; 1637 /* Buffers should be ok again, release possible block. */ 1638 if (cc >= sc->sc_r_lowat) { 1639 if (ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1640 CLR(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1641 SET(sc->sc_cr, CR_RIE | CR_RTIE); 1642 bus_space_write_1(sc->sc_iot, sc->sc_ioh, plcom_cr, sc->sc_cr); 1643 } 1644 if (ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED)) { 1645 CLR(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1646 plcom_hwiflow(sc); 1647 } 1648 } 1649 PLCOM_UNLOCK(sc); 1650 splx(s); 1651 } 1652 } 1653 1654 integrate void 1655 plcom_txsoft(struct plcom_softc *sc, struct tty *tp) 1656 { 1657 1658 CLR(tp->t_state, TS_BUSY); 1659 if (ISSET(tp->t_state, TS_FLUSH)) 1660 CLR(tp->t_state, TS_FLUSH); 1661 else 1662 ndflush(&tp->t_outq, (int)(sc->sc_tba - tp->t_outq.c_cf)); 1663 (*tp->t_linesw->l_start)(tp); 1664 } 1665 1666 integrate void 1667 plcom_stsoft(struct plcom_softc *sc, struct tty *tp) 1668 { 1669 u_char msr, delta; 1670 int s; 1671 1672 s = splserial(); 1673 PLCOM_LOCK(sc); 1674 msr = sc->sc_msr; 1675 delta = sc->sc_msr_delta; 1676 sc->sc_msr_delta = 0; 1677 PLCOM_UNLOCK(sc); 1678 splx(s); 1679 1680 if (ISSET(delta, sc->sc_msr_dcd)) { 1681 /* 1682 * Inform the tty layer that carrier detect changed. 1683 */ 1684 (void) (*tp->t_linesw->l_modem)(tp, ISSET(msr, MSR_DCD)); 1685 } 1686 1687 if (ISSET(delta, sc->sc_msr_cts)) { 1688 /* Block or unblock output according to flow control. */ 1689 if (ISSET(msr, sc->sc_msr_cts)) { 1690 sc->sc_tx_stopped = 0; 1691 (*tp->t_linesw->l_start)(tp); 1692 } else { 1693 sc->sc_tx_stopped = 1; 1694 } 1695 } 1696 1697 #ifdef PLCOM_DEBUG 1698 if (plcom_debug) 1699 plcomstatus(sc, "plcom_stsoft"); 1700 #endif 1701 } 1702 1703 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 1704 void 1705 plcomsoft(void *arg) 1706 { 1707 struct plcom_softc *sc = arg; 1708 struct tty *tp; 1709 1710 if (PLCOM_ISALIVE(sc) == 0) 1711 return; 1712 1713 { 1714 #else 1715 void 1716 #ifndef __NO_SOFT_SERIAL_INTERRUPT 1717 plcomsoft(void) 1718 #else 1719 plcomsoft(void *arg) 1720 #endif 1721 { 1722 struct plcom_softc *sc; 1723 struct tty *tp; 1724 int unit; 1725 #ifdef __NO_SOFT_SERIAL_INTERRUPT 1726 int s; 1727 1728 s = splsoftserial(); 1729 plcom_softintr_scheduled = 0; 1730 #endif 1731 1732 for (unit = 0; unit < plcom_cd.cd_ndevs; unit++) { 1733 sc = device_lookup(&plcom_cd, unit); 1734 if (sc == NULL || !ISSET(sc->sc_hwflags, PLCOM_HW_DEV_OK)) 1735 continue; 1736 1737 if (PLCOM_ISALIVE(sc) == 0) 1738 continue; 1739 1740 tp = sc->sc_tty; 1741 if (tp == NULL) 1742 continue; 1743 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) 1744 continue; 1745 #endif 1746 tp = sc->sc_tty; 1747 1748 if (sc->sc_rx_ready) { 1749 sc->sc_rx_ready = 0; 1750 plcom_rxsoft(sc, tp); 1751 } 1752 1753 if (sc->sc_st_check) { 1754 sc->sc_st_check = 0; 1755 plcom_stsoft(sc, tp); 1756 } 1757 1758 if (sc->sc_tx_done) { 1759 sc->sc_tx_done = 0; 1760 plcom_txsoft(sc, tp); 1761 } 1762 } 1763 1764 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS 1765 #ifdef __NO_SOFT_SERIAL_INTERRUPT 1766 splx(s); 1767 #endif 1768 #endif 1769 } 1770 1771 #ifdef __ALIGN_BRACKET_LEVEL_FOR_CTAGS 1772 /* there has got to be a better way to do plcomsoft() */ 1773 }} 1774 #endif 1775 1776 int 1777 plcomintr(void *arg) 1778 { 1779 struct plcom_softc *sc = arg; 1780 bus_space_tag_t iot = sc->sc_iot; 1781 bus_space_handle_t ioh = sc->sc_ioh; 1782 u_char *put, *end; 1783 u_int cc; 1784 u_char rsr, iir; 1785 1786 if (PLCOM_ISALIVE(sc) == 0) 1787 return 0; 1788 1789 PLCOM_LOCK(sc); 1790 iir = bus_space_read_1(iot, ioh, plcom_iir); 1791 if (! ISSET(iir, IIR_IMASK)) { 1792 PLCOM_UNLOCK(sc); 1793 return 0; 1794 } 1795 1796 end = sc->sc_ebuf; 1797 put = sc->sc_rbput; 1798 cc = sc->sc_rbavail; 1799 1800 do { 1801 u_char msr, delta, fr; 1802 1803 fr = bus_space_read_1(iot, ioh, plcom_fr); 1804 1805 if (!ISSET(fr, FR_RXFE) && 1806 !ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1807 while (cc > 0) { 1808 int cn_trapped = 0; 1809 put[0] = bus_space_read_1(iot, ioh, 1810 plcom_dr); 1811 rsr = bus_space_read_1(iot, ioh, plcom_rsr); 1812 /* Clear any error status. */ 1813 if (ISSET(rsr, 1814 (RSR_BE | RSR_OE | RSR_PE | RSR_FE))) 1815 bus_space_write_1(iot, ioh, plcom_ecr, 1816 0); 1817 if (ISSET(rsr, RSR_BE)) { 1818 cn_trapped = 0; 1819 cn_check_magic(sc->sc_tty->t_dev, 1820 CNC_BREAK, plcom_cnm_state); 1821 if (cn_trapped) 1822 continue; 1823 #if defined(KGDB) 1824 if (ISSET(sc->sc_hwflags, 1825 PLCOM_HW_KGDB)) { 1826 kgdb_connect(1); 1827 continue; 1828 } 1829 #endif 1830 } 1831 1832 put[1] = rsr; 1833 cn_trapped = 0; 1834 cn_check_magic(sc->sc_tty->t_dev, 1835 put[0], plcom_cnm_state); 1836 if (cn_trapped) { 1837 fr = bus_space_read_1(iot, ioh, 1838 plcom_fr); 1839 if (ISSET(fr, FR_RXFE)) 1840 break; 1841 1842 continue; 1843 } 1844 put += 2; 1845 if (put >= end) 1846 put = sc->sc_rbuf; 1847 cc--; 1848 1849 fr = bus_space_read_1(iot, ioh, plcom_fr); 1850 if (ISSET(fr, FR_RXFE)) 1851 break; 1852 } 1853 1854 /* 1855 * Current string of incoming characters ended because 1856 * no more data was available or we ran out of space. 1857 * Schedule a receive event if any data was received. 1858 * If we're out of space, turn off receive interrupts. 1859 */ 1860 sc->sc_rbput = put; 1861 sc->sc_rbavail = cc; 1862 if (!ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) 1863 sc->sc_rx_ready = 1; 1864 1865 /* 1866 * See if we are in danger of overflowing a buffer. If 1867 * so, use hardware flow control to ease the pressure. 1868 */ 1869 if (!ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED) && 1870 cc < sc->sc_r_hiwat) { 1871 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1872 plcom_hwiflow(sc); 1873 } 1874 1875 /* 1876 * If we're out of space, disable receive interrupts 1877 * until the queue has drained a bit. 1878 */ 1879 if (!cc) { 1880 SET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1881 CLR(sc->sc_cr, CR_RIE | CR_RTIE); 1882 bus_space_write_1(iot, ioh, plcom_cr, 1883 sc->sc_cr); 1884 } 1885 } else { 1886 if (ISSET(iir, IIR_RIS)) { 1887 bus_space_write_1(iot, ioh, plcom_cr, 0); 1888 delay(10); 1889 bus_space_write_1(iot, ioh, plcom_cr, 1890 sc->sc_cr); 1891 continue; 1892 } 1893 } 1894 1895 msr = bus_space_read_1(iot, ioh, plcom_fr); 1896 delta = msr ^ sc->sc_msr; 1897 sc->sc_msr = msr; 1898 /* Clear any pending modem status interrupt. */ 1899 if (iir & IIR_MIS) 1900 bus_space_write_1(iot, ioh, plcom_icr, 0); 1901 /* 1902 * Pulse-per-second (PSS) signals on edge of DCD? 1903 * Process these even if line discipline is ignoring DCD. 1904 */ 1905 if (delta & sc->sc_ppsmask) { 1906 struct timeval tv; 1907 if ((msr & sc->sc_ppsmask) == sc->sc_ppsassert) { 1908 /* XXX nanotime() */ 1909 microtime(&tv); 1910 TIMEVAL_TO_TIMESPEC(&tv, 1911 &sc->ppsinfo.assert_timestamp); 1912 if (sc->ppsparam.mode & PPS_OFFSETASSERT) { 1913 timespecadd(&sc->ppsinfo.assert_timestamp, 1914 &sc->ppsparam.assert_offset, 1915 &sc->ppsinfo.assert_timestamp); 1916 } 1917 1918 #ifdef PPS_SYNC 1919 if (sc->ppsparam.mode & PPS_HARDPPSONASSERT) 1920 hardpps(&tv, tv.tv_usec); 1921 #endif 1922 sc->ppsinfo.assert_sequence++; 1923 sc->ppsinfo.current_mode = sc->ppsparam.mode; 1924 1925 } else if ((msr & sc->sc_ppsmask) == sc->sc_ppsclear) { 1926 /* XXX nanotime() */ 1927 microtime(&tv); 1928 TIMEVAL_TO_TIMESPEC(&tv, 1929 &sc->ppsinfo.clear_timestamp); 1930 if (sc->ppsparam.mode & PPS_OFFSETCLEAR) { 1931 timespecadd(&sc->ppsinfo.clear_timestamp, 1932 &sc->ppsparam.clear_offset, 1933 &sc->ppsinfo.clear_timestamp); 1934 } 1935 1936 #ifdef PPS_SYNC 1937 if (sc->ppsparam.mode & PPS_HARDPPSONCLEAR) 1938 hardpps(&tv, tv.tv_usec); 1939 #endif 1940 sc->ppsinfo.clear_sequence++; 1941 sc->ppsinfo.current_mode = sc->ppsparam.mode; 1942 } 1943 } 1944 1945 /* 1946 * Process normal status changes 1947 */ 1948 if (ISSET(delta, sc->sc_msr_mask)) { 1949 SET(sc->sc_msr_delta, delta); 1950 1951 /* 1952 * Stop output immediately if we lose the output 1953 * flow control signal or carrier detect. 1954 */ 1955 if (ISSET(~msr, sc->sc_msr_mask)) { 1956 sc->sc_tbc = 0; 1957 sc->sc_heldtbc = 0; 1958 #ifdef PLCOM_DEBUG 1959 if (plcom_debug) 1960 plcomstatus(sc, "plcomintr "); 1961 #endif 1962 } 1963 1964 sc->sc_st_check = 1; 1965 } 1966 1967 /* 1968 * Done handling any receive interrupts. See if data 1969 * can be * transmitted as well. Schedule tx done 1970 * event if no data left * and tty was marked busy. 1971 */ 1972 if (ISSET(iir, IIR_TIS)) { 1973 /* 1974 * If we've delayed a parameter change, do it 1975 * now, and restart * output. 1976 */ 1977 if (sc->sc_heldchange) { 1978 plcom_loadchannelregs(sc); 1979 sc->sc_heldchange = 0; 1980 sc->sc_tbc = sc->sc_heldtbc; 1981 sc->sc_heldtbc = 0; 1982 } 1983 1984 /* 1985 * Output the next chunk of the contiguous 1986 * buffer, if any. 1987 */ 1988 if (sc->sc_tbc > 0) { 1989 int n; 1990 1991 n = sc->sc_tbc; 1992 if (n > sc->sc_fifolen) 1993 n = sc->sc_fifolen; 1994 bus_space_write_multi_1(iot, ioh, plcom_dr, 1995 sc->sc_tba, n); 1996 sc->sc_tbc -= n; 1997 sc->sc_tba += n; 1998 } else { 1999 /* 2000 * Disable transmit plcompletion 2001 * interrupts if necessary. 2002 */ 2003 if (ISSET(sc->sc_cr, CR_TIE)) { 2004 CLR(sc->sc_cr, CR_TIE); 2005 bus_space_write_1(iot, ioh, plcom_cr, 2006 sc->sc_cr); 2007 } 2008 if (sc->sc_tx_busy) { 2009 sc->sc_tx_busy = 0; 2010 sc->sc_tx_done = 1; 2011 } 2012 } 2013 } 2014 } while (ISSET((iir = bus_space_read_1(iot, ioh, plcom_iir)), 2015 IIR_IMASK)); 2016 2017 PLCOM_UNLOCK(sc); 2018 2019 /* Wake up the poller. */ 2020 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 2021 softintr_schedule(sc->sc_si); 2022 #else 2023 #ifndef __NO_SOFT_SERIAL_INTERRUPT 2024 setsoftserial(); 2025 #else 2026 if (!plcom_softintr_scheduled) { 2027 plcom_softintr_scheduled = 1; 2028 callout_reset(&plcomsoft_callout, 1, plcomsoft, NULL); 2029 } 2030 #endif 2031 #endif 2032 2033 #if NRND > 0 && defined(RND_COM) 2034 rnd_add_uint32(&sc->rnd_source, iir | rsr); 2035 #endif 2036 2037 return 1; 2038 } 2039 2040 /* 2041 * The following functions are polled getc and putc routines, shared 2042 * by the console and kgdb glue. 2043 * 2044 * The read-ahead code is so that you can detect pending in-band 2045 * cn_magic in polled mode while doing output rather than having to 2046 * wait until the kernel decides it needs input. 2047 */ 2048 2049 #define MAX_READAHEAD 20 2050 static int plcom_readahead[MAX_READAHEAD]; 2051 static int plcom_readaheadcount = 0; 2052 2053 int 2054 plcom_common_getc(dev_t dev, bus_space_tag_t iot, bus_space_handle_t ioh) 2055 { 2056 int s = splserial(); 2057 u_char stat, c; 2058 2059 /* got a character from reading things earlier */ 2060 if (plcom_readaheadcount > 0) { 2061 int i; 2062 2063 c = plcom_readahead[0]; 2064 for (i = 1; i < plcom_readaheadcount; i++) { 2065 plcom_readahead[i-1] = plcom_readahead[i]; 2066 } 2067 plcom_readaheadcount--; 2068 splx(s); 2069 return c; 2070 } 2071 2072 /* block until a character becomes available */ 2073 while (ISSET(stat = bus_space_read_1(iot, ioh, plcom_fr), FR_RXFE)) 2074 ; 2075 2076 c = bus_space_read_1(iot, ioh, plcom_dr); 2077 stat = bus_space_read_1(iot, ioh, plcom_iir); 2078 { 2079 int cn_trapped = 0; /* unused */ 2080 #ifdef DDB 2081 extern int db_active; 2082 if (!db_active) 2083 #endif 2084 cn_check_magic(dev, c, plcom_cnm_state); 2085 } 2086 splx(s); 2087 return c; 2088 } 2089 2090 void 2091 plcom_common_putc(dev_t dev, bus_space_tag_t iot, bus_space_handle_t ioh, 2092 int c) 2093 { 2094 int s = splserial(); 2095 int timo; 2096 2097 int cin, stat; 2098 if (plcom_readaheadcount < MAX_READAHEAD 2099 && !ISSET(stat = bus_space_read_1(iot, ioh, plcom_fr), FR_RXFE)) { 2100 int cn_trapped = 0; 2101 cin = bus_space_read_1(iot, ioh, plcom_dr); 2102 stat = bus_space_read_1(iot, ioh, plcom_iir); 2103 cn_check_magic(dev, cin, plcom_cnm_state); 2104 plcom_readahead[plcom_readaheadcount++] = cin; 2105 } 2106 2107 /* wait for any pending transmission to finish */ 2108 timo = 150000; 2109 while (!ISSET(bus_space_read_1(iot, ioh, plcom_fr), FR_TXFE) && --timo) 2110 continue; 2111 2112 bus_space_write_1(iot, ioh, plcom_dr, c); 2113 PLCOM_BARRIER(iot, ioh, BR | BW); 2114 2115 /* wait for this transmission to complete */ 2116 timo = 1500000; 2117 while (!ISSET(bus_space_read_1(iot, ioh, plcom_fr), FR_TXFE) && --timo) 2118 continue; 2119 2120 splx(s); 2121 } 2122 2123 /* 2124 * Initialize UART for use as console or KGDB line. 2125 */ 2126 int 2127 plcominit(bus_space_tag_t iot, bus_addr_t iobase, int rate, int frequency, 2128 tcflag_t cflag, bus_space_handle_t *iohp) 2129 { 2130 bus_space_handle_t ioh; 2131 2132 if (bus_space_map(iot, iobase, PLCOM_UART_SIZE, 0, &ioh)) 2133 return ENOMEM; /* ??? */ 2134 2135 rate = plcomspeed(rate, frequency); 2136 bus_space_write_1(iot, ioh, plcom_cr, 0); 2137 bus_space_write_1(iot, ioh, plcom_dlbl, rate); 2138 bus_space_write_1(iot, ioh, plcom_dlbh, rate >> 8); 2139 bus_space_write_1(iot, ioh, plcom_lcr, cflag2lcr(cflag) | LCR_FEN); 2140 bus_space_write_1(iot, ioh, plcom_cr, CR_UARTEN); 2141 2142 #if 0 2143 /* Ought to do something like this, but we have no sc to 2144 dereference. */ 2145 sc->sc_set_mcr(sc->sc_set_mcr_arg, sc->sc_dev.dv_unit, 2146 MCR_DTR | MCR_RTS); 2147 #endif 2148 2149 *iohp = ioh; 2150 return 0; 2151 } 2152 2153 /* 2154 * Following are all routines needed for PLCOM to act as console 2155 */ 2156 struct consdev plcomcons = { 2157 NULL, NULL, plcomcngetc, plcomcnputc, plcomcnpollc, NULL, 2158 NULL, NULL, NODEV, CN_NORMAL 2159 }; 2160 2161 2162 int 2163 plcomcnattach(bus_space_tag_t iot, bus_addr_t iobase, int rate, int frequency, 2164 tcflag_t cflag, int unit) 2165 { 2166 int res; 2167 2168 res = plcominit(iot, iobase, rate, frequency, cflag, &plcomconsioh); 2169 if (res) 2170 return res; 2171 2172 cn_tab = &plcomcons; 2173 cn_init_magic(&plcom_cnm_state); 2174 cn_set_magic("\047\001"); /* default magic is BREAK */ 2175 2176 plcomconstag = iot; 2177 plcomconsunit = unit; 2178 plcomconsrate = rate; 2179 plcomconscflag = cflag; 2180 2181 return 0; 2182 } 2183 2184 void 2185 plcomcndetach(void) 2186 { 2187 bus_space_unmap(plcomconstag, plcomconsioh, PLCOM_UART_SIZE); 2188 plcomconstag = NULL; 2189 2190 cn_tab = NULL; 2191 } 2192 2193 int 2194 plcomcngetc(dev_t dev) 2195 { 2196 return plcom_common_getc(dev, plcomconstag, plcomconsioh); 2197 } 2198 2199 /* 2200 * Console kernel output character routine. 2201 */ 2202 void 2203 plcomcnputc(dev_t dev, int c) 2204 { 2205 plcom_common_putc(dev, plcomconstag, plcomconsioh, c); 2206 } 2207 2208 void 2209 plcomcnpollc(dev_t dev, int on) 2210 { 2211 2212 } 2213 2214 #ifdef KGDB 2215 int 2216 plcom_kgdb_attach(bus_space_tag_t iot, bus_addr_t iobase, int rate, 2217 int frequency, tcflag_t cflag, int unit) 2218 { 2219 int res; 2220 2221 if (iot == plcomconstag && iobase == plcomconsunit) 2222 return EBUSY; /* cannot share with console */ 2223 2224 res = plcominit(iot, iobase, rate, frequency, cflag, &plcom_kgdb_ioh); 2225 if (res) 2226 return res; 2227 2228 kgdb_attach(plcom_kgdb_getc, plcom_kgdb_putc, NULL); 2229 kgdb_dev = 123; /* unneeded, only to satisfy some tests */ 2230 2231 plcom_kgdb_iot = iot; 2232 plcom_kgdb_unit = unit; 2233 2234 return 0; 2235 } 2236 2237 /* ARGSUSED */ 2238 int 2239 plcom_kgdb_getc(void *arg) 2240 { 2241 return plcom_common_getc(NODEV, plcom_kgdb_iot, plcom_kgdb_ioh); 2242 } 2243 2244 /* ARGSUSED */ 2245 void 2246 plcom_kgdb_putc(void *arg, int c) 2247 { 2248 plcom_common_putc(NODEV, plcom_kgdb_iot, plcom_kgdb_ioh, c); 2249 } 2250 #endif /* KGDB */ 2251 2252 /* helper function to identify the plcom ports used by 2253 console or KGDB (and not yet autoconf attached) */ 2254 int 2255 plcom_is_console(bus_space_tag_t iot, int unit, 2256 bus_space_handle_t *ioh) 2257 { 2258 bus_space_handle_t help; 2259 2260 if (!plcomconsattached && 2261 iot == plcomconstag && unit == plcomconsunit) 2262 help = plcomconsioh; 2263 #ifdef KGDB 2264 else if (!plcom_kgdb_attached && 2265 iot == plcom_kgdb_iot && unit == plcom_kgdb_unit) 2266 help = plcom_kgdb_ioh; 2267 #endif 2268 else 2269 return 0; 2270 2271 if (ioh) 2272 *ioh = help; 2273 return 1; 2274 } 2275
Indexes created Tue Sep 23 14:10:03 GMT 2025