plcom.c revision 1.16
1 /* $NetBSD: plcom.c,v 1.16 2006/05/14 21:55:10 elad 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 1.16 2006/05/14 21:55:10 elad Exp $"); 105 106 #include "opt_plcom.h" 107 #include "opt_ddb.h" 108 #include "opt_kgdb.h" 109 #include "opt_lockdebug.h" 110 #include "opt_multiprocessor.h" 111 112 #include "rnd.h" 113 #if NRND > 0 && defined(RND_COM) 114 #include <sys/rnd.h> 115 #endif 116 117 /* 118 * Override cnmagic(9) macro before including <sys/systm.h>. 119 * We need to know if cn_check_magic triggered debugger, so set a flag. 120 * Callers of cn_check_magic must declare int cn_trapped = 0; 121 * XXX: this is *ugly*! 122 */ 123 #define cn_trap() \ 124 do { \ 125 console_debugger(); \ 126 cn_trapped = 1; \ 127 } while (/* CONSTCOND */ 0) 128 129 #include <sys/param.h> 130 #include <sys/systm.h> 131 #include <sys/ioctl.h> 132 #include <sys/select.h> 133 #include <sys/tty.h> 134 #include <sys/proc.h> 135 #include <sys/user.h> 136 #include <sys/conf.h> 137 #include <sys/file.h> 138 #include <sys/uio.h> 139 #include <sys/kernel.h> 140 #include <sys/syslog.h> 141 #include <sys/types.h> 142 #include <sys/device.h> 143 #include <sys/malloc.h> 144 #include <sys/timepps.h> 145 #include <sys/vnode.h> 146 #include <sys/kauth.h> 147 148 #include <machine/intr.h> 149 #include <machine/bus.h> 150 151 #include <evbarm/dev/plcomreg.h> 152 #include <evbarm/dev/plcomvar.h> 153 154 #include <dev/cons.h> 155 156 static void plcom_enable_debugport (struct plcom_softc *); 157 158 void plcom_config (struct plcom_softc *); 159 void plcom_shutdown (struct plcom_softc *); 160 int plcomspeed (long, long); 161 static u_char cflag2lcr (tcflag_t); 162 int plcomparam (struct tty *, struct termios *); 163 void plcomstart (struct tty *); 164 int plcomhwiflow (struct tty *, int); 165 166 void plcom_loadchannelregs (struct plcom_softc *); 167 void plcom_hwiflow (struct plcom_softc *); 168 void plcom_break (struct plcom_softc *, int); 169 void plcom_modem (struct plcom_softc *, int); 170 void tiocm_to_plcom (struct plcom_softc *, u_long, int); 171 int plcom_to_tiocm (struct plcom_softc *); 172 void plcom_iflush (struct plcom_softc *); 173 174 int plcom_common_getc (dev_t, bus_space_tag_t, bus_space_handle_t); 175 void plcom_common_putc (dev_t, bus_space_tag_t, bus_space_handle_t, int); 176 177 int plcominit (bus_space_tag_t, bus_addr_t, int, int, tcflag_t, 178 bus_space_handle_t *); 179 180 dev_type_open(plcomopen); 181 dev_type_close(plcomclose); 182 dev_type_read(plcomread); 183 dev_type_write(plcomwrite); 184 dev_type_ioctl(plcomioctl); 185 dev_type_stop(plcomstop); 186 dev_type_tty(plcomtty); 187 dev_type_poll(plcompoll); 188 189 int plcomcngetc (dev_t); 190 void plcomcnputc (dev_t, int); 191 void plcomcnpollc (dev_t, int); 192 193 #define integrate static inline 194 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 195 void plcomsoft (void *); 196 #else 197 #ifndef __NO_SOFT_SERIAL_INTERRUPT 198 void plcomsoft (void); 199 #else 200 void plcomsoft (void *); 201 struct callout plcomsoft_callout = CALLOUT_INITIALIZER; 202 #endif 203 #endif 204 integrate void plcom_rxsoft (struct plcom_softc *, struct tty *); 205 integrate void plcom_txsoft (struct plcom_softc *, struct tty *); 206 integrate void plcom_stsoft (struct plcom_softc *, struct tty *); 207 integrate void plcom_schedrx (struct plcom_softc *); 208 void plcomdiag (void *); 209 210 extern struct cfdriver plcom_cd; 211 212 const struct cdevsw plcom_cdevsw = { 213 plcomopen, plcomclose, plcomread, plcomwrite, plcomioctl, 214 plcomstop, plcomtty, plcompoll, nommap, ttykqfilter, D_TTY 215 }; 216 217 /* 218 * Make this an option variable one can patch. 219 * But be warned: this must be a power of 2! 220 */ 221 u_int plcom_rbuf_size = PLCOM_RING_SIZE; 222 223 /* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */ 224 u_int plcom_rbuf_hiwat = (PLCOM_RING_SIZE * 1) / 4; 225 u_int plcom_rbuf_lowat = (PLCOM_RING_SIZE * 3) / 4; 226 227 static int plcomconsunit = -1; 228 static bus_space_tag_t plcomconstag; 229 static bus_space_handle_t plcomconsioh; 230 static int plcomconsattached; 231 static int plcomconsrate; 232 static tcflag_t plcomconscflag; 233 static struct cnm_state plcom_cnm_state; 234 235 static int ppscap = 236 PPS_TSFMT_TSPEC | 237 PPS_CAPTUREASSERT | 238 PPS_CAPTURECLEAR | 239 #ifdef PPS_SYNC 240 PPS_HARDPPSONASSERT | PPS_HARDPPSONCLEAR | 241 #endif /* PPS_SYNC */ 242 PPS_OFFSETASSERT | PPS_OFFSETCLEAR; 243 244 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS 245 #ifdef __NO_SOFT_SERIAL_INTERRUPT 246 volatile int plcom_softintr_scheduled; 247 #endif 248 #endif 249 250 #ifdef KGDB 251 #include <sys/kgdb.h> 252 253 static int plcom_kgdb_unit; 254 static bus_space_tag_t plcom_kgdb_iot; 255 static bus_space_handle_t plcom_kgdb_ioh; 256 static int plcom_kgdb_attached; 257 258 int plcom_kgdb_getc (void *); 259 void plcom_kgdb_putc (void *, int); 260 #endif /* KGDB */ 261 262 #define PLCOMUNIT_MASK 0x7ffff 263 #define PLCOMDIALOUT_MASK 0x80000 264 265 #define PLCOMUNIT(x) (minor(x) & PLCOMUNIT_MASK) 266 #define PLCOMDIALOUT(x) (minor(x) & PLCOMDIALOUT_MASK) 267 268 #define PLCOM_ISALIVE(sc) ((sc)->enabled != 0 && \ 269 device_is_active(&(sc)->sc_dev)) 270 271 #define BR BUS_SPACE_BARRIER_READ 272 #define BW BUS_SPACE_BARRIER_WRITE 273 #define PLCOM_BARRIER(t, h, f) bus_space_barrier((t), (h), 0, PLCOM_UART_SIZE, (f)) 274 275 #define PLCOM_LOCK(sc) simple_lock(&(sc)->sc_lock) 276 #define PLCOM_UNLOCK(sc) simple_unlock(&(sc)->sc_lock) 277 278 int 279 plcomspeed(long speed, long frequency) 280 { 281 #define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */ 282 283 int x, err; 284 285 #if 0 286 if (speed == 0) 287 return 0; 288 #endif 289 if (speed <= 0) 290 return -1; 291 x = divrnd(frequency / 16, speed); 292 if (x <= 0) 293 return -1; 294 err = divrnd(((quad_t)frequency) * 1000 / 16, speed * x) - 1000; 295 if (err < 0) 296 err = -err; 297 if (err > PLCOM_TOLERANCE) 298 return -1; 299 return x; 300 301 #undef divrnd 302 } 303 304 #ifdef PLCOM_DEBUG 305 int plcom_debug = 0; 306 307 void plcomstatus (struct plcom_softc *, char *); 308 void 309 plcomstatus(struct plcom_softc *sc, char *str) 310 { 311 struct tty *tp = sc->sc_tty; 312 313 printf("%s: %s %sclocal %sdcd %sts_carr_on %sdtr %stx_stopped\n", 314 sc->sc_dev.dv_xname, str, 315 ISSET(tp->t_cflag, CLOCAL) ? "+" : "-", 316 ISSET(sc->sc_msr, MSR_DCD) ? "+" : "-", 317 ISSET(tp->t_state, TS_CARR_ON) ? "+" : "-", 318 ISSET(sc->sc_mcr, MCR_DTR) ? "+" : "-", 319 sc->sc_tx_stopped ? "+" : "-"); 320 321 printf("%s: %s %scrtscts %scts %sts_ttstop %srts %xrx_flags\n", 322 sc->sc_dev.dv_xname, str, 323 ISSET(tp->t_cflag, CRTSCTS) ? "+" : "-", 324 ISSET(sc->sc_msr, MSR_CTS) ? "+" : "-", 325 ISSET(tp->t_state, TS_TTSTOP) ? "+" : "-", 326 ISSET(sc->sc_mcr, MCR_RTS) ? "+" : "-", 327 sc->sc_rx_flags); 328 } 329 #endif 330 331 int 332 plcomprobe1(bus_space_tag_t iot, bus_space_handle_t ioh) 333 { 334 int data; 335 336 /* Disable the UART. */ 337 bus_space_write_1(iot, ioh, plcom_cr, 0); 338 /* Make sure the FIFO is off. */ 339 bus_space_write_1(iot, ioh, plcom_lcr, LCR_8BITS); 340 /* Disable interrupts. */ 341 bus_space_write_1(iot, ioh, plcom_iir, 0); 342 343 /* Make sure we swallow anything in the receiving register. */ 344 data = bus_space_read_1(iot, ioh, plcom_dr); 345 346 if (bus_space_read_1(iot, ioh, plcom_lcr) != LCR_8BITS) 347 return 0; 348 349 data = bus_space_read_1(iot, ioh, plcom_fr) & (FR_RXFF | FR_RXFE); 350 351 if (data != FR_RXFE) 352 return 0; 353 354 return 1; 355 } 356 357 static void 358 plcom_enable_debugport(struct plcom_softc *sc) 359 { 360 int s; 361 362 /* Turn on line break interrupt, set carrier. */ 363 s = splserial(); 364 PLCOM_LOCK(sc); 365 sc->sc_cr = CR_RIE | CR_RTIE | CR_UARTEN; 366 bus_space_write_1(sc->sc_iot, sc->sc_ioh, plcom_cr, sc->sc_cr); 367 SET(sc->sc_mcr, MCR_DTR | MCR_RTS); 368 /* XXX device_unit() abuse */ 369 sc->sc_set_mcr(sc->sc_set_mcr_arg, device_unit(&sc->sc_dev), 370 sc->sc_mcr); 371 PLCOM_UNLOCK(sc); 372 splx(s); 373 } 374 375 void 376 plcom_attach_subr(struct plcom_softc *sc) 377 { 378 int unit = sc->sc_iounit; 379 bus_space_tag_t iot = sc->sc_iot; 380 bus_space_handle_t ioh = sc->sc_ioh; 381 struct tty *tp; 382 383 callout_init(&sc->sc_diag_callout); 384 simple_lock_init(&sc->sc_lock); 385 386 /* Disable interrupts before configuring the device. */ 387 sc->sc_cr = 0; 388 389 if (plcomconstag && unit == plcomconsunit) { 390 plcomconsattached = 1; 391 392 plcomconstag = iot; 393 plcomconsioh = ioh; 394 395 /* Make sure the console is always "hardwired". */ 396 delay(1000); /* wait for output to finish */ 397 SET(sc->sc_hwflags, PLCOM_HW_CONSOLE); 398 SET(sc->sc_swflags, TIOCFLAG_SOFTCAR); 399 /* Must re-enable the console immediately, or we will 400 hang when trying to print. */ 401 sc->sc_cr = CR_UARTEN; 402 } 403 404 bus_space_write_1(iot, ioh, plcom_cr, sc->sc_cr); 405 406 /* The PL010 has a 16-byte fifo, but the tx interrupt triggers when 407 there is space for 8 more bytes. */ 408 sc->sc_fifolen = 8; 409 printf("\n"); 410 411 if (ISSET(sc->sc_hwflags, PLCOM_HW_TXFIFO_DISABLE)) { 412 sc->sc_fifolen = 1; 413 printf("%s: txfifo disabled\n", sc->sc_dev.dv_xname); 414 } 415 416 if (sc->sc_fifolen > 1) 417 SET(sc->sc_hwflags, PLCOM_HW_FIFO); 418 419 tp = ttymalloc(); 420 tp->t_oproc = plcomstart; 421 tp->t_param = plcomparam; 422 tp->t_hwiflow = plcomhwiflow; 423 424 sc->sc_tty = tp; 425 sc->sc_rbuf = malloc(plcom_rbuf_size << 1, M_DEVBUF, M_NOWAIT); 426 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 427 sc->sc_rbavail = plcom_rbuf_size; 428 if (sc->sc_rbuf == NULL) { 429 printf("%s: unable to allocate ring buffer\n", 430 sc->sc_dev.dv_xname); 431 return; 432 } 433 sc->sc_ebuf = sc->sc_rbuf + (plcom_rbuf_size << 1); 434 435 tty_attach(tp); 436 437 if (ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE)) { 438 int maj; 439 440 /* locate the major number */ 441 maj = cdevsw_lookup_major(&plcom_cdevsw); 442 443 cn_tab->cn_dev = makedev(maj, device_unit(&sc->sc_dev)); 444 445 printf("%s: console\n", sc->sc_dev.dv_xname); 446 } 447 448 #ifdef KGDB 449 /* 450 * Allow kgdb to "take over" this port. If this is 451 * the kgdb device, it has exclusive use. 452 */ 453 if (iot == plcom_kgdb_iot && unit == plcom_kgdb_unit) { 454 plcom_kgdb_attached = 1; 455 456 SET(sc->sc_hwflags, PLCOM_HW_KGDB); 457 printf("%s: kgdb\n", sc->sc_dev.dv_xname); 458 } 459 #endif 460 461 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 462 sc->sc_si = softintr_establish(IPL_SOFTSERIAL, plcomsoft, sc); 463 #endif 464 465 #if NRND > 0 && defined(RND_COM) 466 rnd_attach_source(&sc->rnd_source, sc->sc_dev.dv_xname, 467 RND_TYPE_TTY, 0); 468 #endif 469 470 /* if there are no enable/disable functions, assume the device 471 is always enabled */ 472 if (!sc->enable) 473 sc->enabled = 1; 474 475 plcom_config(sc); 476 477 SET(sc->sc_hwflags, PLCOM_HW_DEV_OK); 478 } 479 480 void 481 plcom_config(struct plcom_softc *sc) 482 { 483 bus_space_tag_t iot = sc->sc_iot; 484 bus_space_handle_t ioh = sc->sc_ioh; 485 486 /* Disable interrupts before configuring the device. */ 487 sc->sc_cr = 0; 488 bus_space_write_1(iot, ioh, plcom_cr, sc->sc_cr); 489 490 if (ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE|PLCOM_HW_KGDB)) 491 plcom_enable_debugport(sc); 492 } 493 494 int 495 plcom_detach(self, flags) 496 struct device *self; 497 int flags; 498 { 499 struct plcom_softc *sc = (struct plcom_softc *)self; 500 int maj, mn; 501 502 /* locate the major number */ 503 maj = cdevsw_lookup_major(&plcom_cdevsw); 504 505 /* Nuke the vnodes for any open instances. */ 506 mn = device_unit(self); 507 vdevgone(maj, mn, mn, VCHR); 508 509 mn |= PLCOMDIALOUT_MASK; 510 vdevgone(maj, mn, mn, VCHR); 511 512 /* Free the receive buffer. */ 513 free(sc->sc_rbuf, M_DEVBUF); 514 515 /* Detach and free the tty. */ 516 tty_detach(sc->sc_tty); 517 ttyfree(sc->sc_tty); 518 519 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 520 /* Unhook the soft interrupt handler. */ 521 softintr_disestablish(sc->sc_si); 522 #endif 523 524 #if NRND > 0 && defined(RND_COM) 525 /* Unhook the entropy source. */ 526 rnd_detach_source(&sc->rnd_source); 527 #endif 528 529 return 0; 530 } 531 532 int 533 plcom_activate(struct device *self, enum devact act) 534 { 535 struct plcom_softc *sc = (struct plcom_softc *)self; 536 int s, rv = 0; 537 538 s = splserial(); 539 PLCOM_LOCK(sc); 540 switch (act) { 541 case DVACT_ACTIVATE: 542 rv = EOPNOTSUPP; 543 break; 544 545 case DVACT_DEACTIVATE: 546 if (sc->sc_hwflags & (PLCOM_HW_CONSOLE|PLCOM_HW_KGDB)) { 547 rv = EBUSY; 548 break; 549 } 550 551 if (sc->disable != NULL && sc->enabled != 0) { 552 (*sc->disable)(sc); 553 sc->enabled = 0; 554 } 555 break; 556 } 557 558 PLCOM_UNLOCK(sc); 559 splx(s); 560 return rv; 561 } 562 563 void 564 plcom_shutdown(struct plcom_softc *sc) 565 { 566 struct tty *tp = sc->sc_tty; 567 int s; 568 569 s = splserial(); 570 PLCOM_LOCK(sc); 571 572 /* If we were asserting flow control, then deassert it. */ 573 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 574 plcom_hwiflow(sc); 575 576 /* Clear any break condition set with TIOCSBRK. */ 577 plcom_break(sc, 0); 578 579 /* Turn off PPS capture on last close. */ 580 sc->sc_ppsmask = 0; 581 sc->ppsparam.mode = 0; 582 583 /* 584 * Hang up if necessary. Wait a bit, so the other side has time to 585 * notice even if we immediately open the port again. 586 * Avoid tsleeping above splhigh(). 587 */ 588 if (ISSET(tp->t_cflag, HUPCL)) { 589 plcom_modem(sc, 0); 590 PLCOM_UNLOCK(sc); 591 splx(s); 592 /* XXX tsleep will only timeout */ 593 (void) tsleep(sc, TTIPRI, ttclos, hz); 594 s = splserial(); 595 PLCOM_LOCK(sc); 596 } 597 598 /* Turn off interrupts. */ 599 if (ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE)) 600 /* interrupt on break */ 601 sc->sc_cr = CR_RIE | CR_RTIE | CR_UARTEN; 602 else 603 sc->sc_cr = 0; 604 bus_space_write_1(sc->sc_iot, sc->sc_ioh, plcom_cr, sc->sc_cr); 605 606 if (sc->disable) { 607 #ifdef DIAGNOSTIC 608 if (!sc->enabled) 609 panic("plcom_shutdown: not enabled?"); 610 #endif 611 (*sc->disable)(sc); 612 sc->enabled = 0; 613 } 614 PLCOM_UNLOCK(sc); 615 splx(s); 616 } 617 618 int 619 plcomopen(dev_t dev, int flag, int mode, struct lwp *l) 620 { 621 struct plcom_softc *sc; 622 struct tty *tp; 623 int s, s2; 624 int error; 625 626 sc = device_lookup(&plcom_cd, PLCOMUNIT(dev)); 627 if (sc == NULL || !ISSET(sc->sc_hwflags, PLCOM_HW_DEV_OK) || 628 sc->sc_rbuf == NULL) 629 return ENXIO; 630 631 if (!device_is_active(&sc->sc_dev)) 632 return ENXIO; 633 634 #ifdef KGDB 635 /* 636 * If this is the kgdb port, no other use is permitted. 637 */ 638 if (ISSET(sc->sc_hwflags, PLCOM_HW_KGDB)) 639 return EBUSY; 640 #endif 641 642 tp = sc->sc_tty; 643 644 if (ISSET(tp->t_state, TS_ISOPEN) && 645 ISSET(tp->t_state, TS_XCLUDE) && 646 kauth_authorize_generic(l->l_proc->p_cred, 647 KAUTH_GENERIC_ISSUSER, 648 &l->l_proc->p_acflag) != 0) 649 return EBUSY; 650 651 s = spltty(); 652 653 /* 654 * Do the following iff this is a first open. 655 */ 656 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 657 struct termios t; 658 659 tp->t_dev = dev; 660 661 s2 = splserial(); 662 PLCOM_LOCK(sc); 663 664 if (sc->enable) { 665 if ((*sc->enable)(sc)) { 666 PLCOM_UNLOCK(sc); 667 splx(s2); 668 splx(s); 669 printf("%s: device enable failed\n", 670 sc->sc_dev.dv_xname); 671 return EIO; 672 } 673 sc->enabled = 1; 674 plcom_config(sc); 675 } 676 677 /* Turn on interrupts. */ 678 /* IER_ERXRDY | IER_ERLS | IER_EMSC; */ 679 sc->sc_cr = CR_RIE | CR_RTIE | CR_MSIE | CR_UARTEN; 680 bus_space_write_1(sc->sc_iot, sc->sc_ioh, plcom_cr, sc->sc_cr); 681 682 /* Fetch the current modem control status, needed later. */ 683 sc->sc_msr = bus_space_read_1(sc->sc_iot, sc->sc_ioh, plcom_fr); 684 685 /* Clear PPS capture state on first open. */ 686 sc->sc_ppsmask = 0; 687 sc->ppsparam.mode = 0; 688 689 PLCOM_UNLOCK(sc); 690 splx(s2); 691 692 /* 693 * Initialize the termios status to the defaults. Add in the 694 * sticky bits from TIOCSFLAGS. 695 */ 696 t.c_ispeed = 0; 697 if (ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE)) { 698 t.c_ospeed = plcomconsrate; 699 t.c_cflag = plcomconscflag; 700 } else { 701 t.c_ospeed = TTYDEF_SPEED; 702 t.c_cflag = TTYDEF_CFLAG; 703 } 704 if (ISSET(sc->sc_swflags, TIOCFLAG_CLOCAL)) 705 SET(t.c_cflag, CLOCAL); 706 if (ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS)) 707 SET(t.c_cflag, CRTSCTS); 708 if (ISSET(sc->sc_swflags, TIOCFLAG_MDMBUF)) 709 SET(t.c_cflag, MDMBUF); 710 /* Make sure plcomparam() will do something. */ 711 tp->t_ospeed = 0; 712 (void) plcomparam(tp, &t); 713 tp->t_iflag = TTYDEF_IFLAG; 714 tp->t_oflag = TTYDEF_OFLAG; 715 tp->t_lflag = TTYDEF_LFLAG; 716 ttychars(tp); 717 ttsetwater(tp); 718 719 s2 = splserial(); 720 PLCOM_LOCK(sc); 721 722 /* 723 * Turn on DTR. We must always do this, even if carrier is not 724 * present, because otherwise we'd have to use TIOCSDTR 725 * immediately after setting CLOCAL, which applications do not 726 * expect. We always assert DTR while the device is open 727 * unless explicitly requested to deassert it. 728 */ 729 plcom_modem(sc, 1); 730 731 /* Clear the input ring, and unblock. */ 732 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 733 sc->sc_rbavail = plcom_rbuf_size; 734 plcom_iflush(sc); 735 CLR(sc->sc_rx_flags, RX_ANY_BLOCK); 736 plcom_hwiflow(sc); 737 738 #ifdef PLCOM_DEBUG 739 if (plcom_debug) 740 plcomstatus(sc, "plcomopen "); 741 #endif 742 743 PLCOM_UNLOCK(sc); 744 splx(s2); 745 } 746 747 splx(s); 748 749 error = ttyopen(tp, PLCOMDIALOUT(dev), ISSET(flag, O_NONBLOCK)); 750 if (error) 751 goto bad; 752 753 error = (*tp->t_linesw->l_open)(dev, tp); 754 if (error) 755 goto bad; 756 757 return 0; 758 759 bad: 760 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 761 /* 762 * We failed to open the device, and nobody else had it opened. 763 * Clean up the state as appropriate. 764 */ 765 plcom_shutdown(sc); 766 } 767 768 return error; 769 } 770 771 int 772 plcomclose(dev_t dev, int flag, int mode, struct lwp *l) 773 { 774 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(dev)); 775 struct tty *tp = sc->sc_tty; 776 777 /* XXX This is for cons.c. */ 778 if (!ISSET(tp->t_state, TS_ISOPEN)) 779 return 0; 780 781 (*tp->t_linesw->l_close)(tp, flag); 782 ttyclose(tp); 783 784 if (PLCOM_ISALIVE(sc) == 0) 785 return 0; 786 787 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 788 /* 789 * Although we got a last close, the device may still be in 790 * use; e.g. if this was the dialout node, and there are still 791 * processes waiting for carrier on the non-dialout node. 792 */ 793 plcom_shutdown(sc); 794 } 795 796 return 0; 797 } 798 799 int 800 plcomread(dev_t dev, struct uio *uio, int flag) 801 { 802 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(dev)); 803 struct tty *tp = sc->sc_tty; 804 805 if (PLCOM_ISALIVE(sc) == 0) 806 return EIO; 807 808 return (*tp->t_linesw->l_read)(tp, uio, flag); 809 } 810 811 int 812 plcomwrite(dev_t dev, struct uio *uio, int flag) 813 { 814 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(dev)); 815 struct tty *tp = sc->sc_tty; 816 817 if (PLCOM_ISALIVE(sc) == 0) 818 return EIO; 819 820 return (*tp->t_linesw->l_write)(tp, uio, flag); 821 } 822 823 int 824 plcompoll(dev_t dev, int events, struct lwp *l) 825 { 826 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(dev)); 827 struct tty *tp = sc->sc_tty; 828 829 if (PLCOM_ISALIVE(sc) == 0) 830 return EIO; 831 832 return (*tp->t_linesw->l_poll)(tp, events, l); 833 } 834 835 struct tty * 836 plcomtty(dev_t dev) 837 { 838 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(dev)); 839 struct tty *tp = sc->sc_tty; 840 841 return tp; 842 } 843 844 int 845 plcomioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct lwp *l) 846 { 847 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(dev)); 848 struct tty *tp = sc->sc_tty; 849 int error; 850 int s; 851 852 if (PLCOM_ISALIVE(sc) == 0) 853 return EIO; 854 855 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 856 if (error != EPASSTHROUGH) 857 return error; 858 859 error = ttioctl(tp, cmd, data, flag, l); 860 if (error != EPASSTHROUGH) 861 return error; 862 863 error = 0; 864 865 s = splserial(); 866 PLCOM_LOCK(sc); 867 868 switch (cmd) { 869 case TIOCSBRK: 870 plcom_break(sc, 1); 871 break; 872 873 case TIOCCBRK: 874 plcom_break(sc, 0); 875 break; 876 877 case TIOCSDTR: 878 plcom_modem(sc, 1); 879 break; 880 881 case TIOCCDTR: 882 plcom_modem(sc, 0); 883 break; 884 885 case TIOCGFLAGS: 886 *(int *)data = sc->sc_swflags; 887 break; 888 889 case TIOCSFLAGS: 890 error = kauth_authorize_generic(l->l_proc->p_cred, 891 KAUTH_GENERIC_ISSUSER, 892 &l->l_proc->p_acflag); 893 if (error) 894 break; 895 sc->sc_swflags = *(int *)data; 896 break; 897 898 case TIOCMSET: 899 case TIOCMBIS: 900 case TIOCMBIC: 901 tiocm_to_plcom(sc, cmd, *(int *)data); 902 break; 903 904 case TIOCMGET: 905 *(int *)data = plcom_to_tiocm(sc); 906 break; 907 908 case PPS_IOC_CREATE: 909 break; 910 911 case PPS_IOC_DESTROY: 912 break; 913 914 case PPS_IOC_GETPARAMS: { 915 pps_params_t *pp; 916 pp = (pps_params_t *)data; 917 *pp = sc->ppsparam; 918 break; 919 } 920 921 case PPS_IOC_SETPARAMS: { 922 pps_params_t *pp; 923 int mode; 924 pp = (pps_params_t *)data; 925 if (pp->mode & ~ppscap) { 926 error = EINVAL; 927 break; 928 } 929 sc->ppsparam = *pp; 930 /* 931 * Compute msr masks from user-specified timestamp state. 932 */ 933 mode = sc->ppsparam.mode; 934 #ifdef PPS_SYNC 935 if (mode & PPS_HARDPPSONASSERT) { 936 mode |= PPS_CAPTUREASSERT; 937 /* XXX revoke any previous HARDPPS source */ 938 } 939 if (mode & PPS_HARDPPSONCLEAR) { 940 mode |= PPS_CAPTURECLEAR; 941 /* XXX revoke any previous HARDPPS source */ 942 } 943 #endif /* PPS_SYNC */ 944 switch (mode & PPS_CAPTUREBOTH) { 945 case 0: 946 sc->sc_ppsmask = 0; 947 break; 948 949 case PPS_CAPTUREASSERT: 950 sc->sc_ppsmask = MSR_DCD; 951 sc->sc_ppsassert = MSR_DCD; 952 sc->sc_ppsclear = -1; 953 break; 954 955 case PPS_CAPTURECLEAR: 956 sc->sc_ppsmask = MSR_DCD; 957 sc->sc_ppsassert = -1; 958 sc->sc_ppsclear = 0; 959 break; 960 961 case PPS_CAPTUREBOTH: 962 sc->sc_ppsmask = MSR_DCD; 963 sc->sc_ppsassert = MSR_DCD; 964 sc->sc_ppsclear = 0; 965 break; 966 967 default: 968 error = EINVAL; 969 break; 970 } 971 break; 972 } 973 974 case PPS_IOC_GETCAP: 975 *(int*)data = ppscap; 976 break; 977 978 case PPS_IOC_FETCH: { 979 pps_info_t *pi; 980 pi = (pps_info_t *)data; 981 *pi = sc->ppsinfo; 982 break; 983 } 984 985 case TIOCDCDTIMESTAMP: /* XXX old, overloaded API used by xntpd v3 */ 986 /* 987 * Some GPS clocks models use the falling rather than 988 * rising edge as the on-the-second signal. 989 * The old API has no way to specify PPS polarity. 990 */ 991 sc->sc_ppsmask = MSR_DCD; 992 #ifndef PPS_TRAILING_EDGE 993 sc->sc_ppsassert = MSR_DCD; 994 sc->sc_ppsclear = -1; 995 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 996 &sc->ppsinfo.assert_timestamp); 997 #else 998 sc->sc_ppsassert = -1 999 sc->sc_ppsclear = 0; 1000 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 1001 &sc->ppsinfo.clear_timestamp); 1002 #endif 1003 break; 1004 1005 default: 1006 error = EPASSTHROUGH; 1007 break; 1008 } 1009 1010 PLCOM_UNLOCK(sc); 1011 splx(s); 1012 1013 #ifdef PLCOM_DEBUG 1014 if (plcom_debug) 1015 plcomstatus(sc, "plcomioctl "); 1016 #endif 1017 1018 return error; 1019 } 1020 1021 integrate void 1022 plcom_schedrx(struct plcom_softc *sc) 1023 { 1024 1025 sc->sc_rx_ready = 1; 1026 1027 /* Wake up the poller. */ 1028 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 1029 softintr_schedule(sc->sc_si); 1030 #else 1031 #ifndef __NO_SOFT_SERIAL_INTERRUPT 1032 setsoftserial(); 1033 #else 1034 if (!plcom_softintr_scheduled) { 1035 plcom_softintr_scheduled = 1; 1036 callout_reset(&plcomsoft_callout, 1, plcomsoft, NULL); 1037 } 1038 #endif 1039 #endif 1040 } 1041 1042 void 1043 plcom_break(struct plcom_softc *sc, int onoff) 1044 { 1045 1046 if (onoff) 1047 SET(sc->sc_lcr, LCR_BRK); 1048 else 1049 CLR(sc->sc_lcr, LCR_BRK); 1050 1051 if (!sc->sc_heldchange) { 1052 if (sc->sc_tx_busy) { 1053 sc->sc_heldtbc = sc->sc_tbc; 1054 sc->sc_tbc = 0; 1055 sc->sc_heldchange = 1; 1056 } else 1057 plcom_loadchannelregs(sc); 1058 } 1059 } 1060 1061 void 1062 plcom_modem(struct plcom_softc *sc, int onoff) 1063 { 1064 1065 if (sc->sc_mcr_dtr == 0) 1066 return; 1067 1068 if (onoff) 1069 SET(sc->sc_mcr, sc->sc_mcr_dtr); 1070 else 1071 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 1072 1073 if (!sc->sc_heldchange) { 1074 if (sc->sc_tx_busy) { 1075 sc->sc_heldtbc = sc->sc_tbc; 1076 sc->sc_tbc = 0; 1077 sc->sc_heldchange = 1; 1078 } else 1079 plcom_loadchannelregs(sc); 1080 } 1081 } 1082 1083 void 1084 tiocm_to_plcom(struct plcom_softc *sc, u_long how, int ttybits) 1085 { 1086 u_char plcombits; 1087 1088 plcombits = 0; 1089 if (ISSET(ttybits, TIOCM_DTR)) 1090 SET(plcombits, MCR_DTR); 1091 if (ISSET(ttybits, TIOCM_RTS)) 1092 SET(plcombits, MCR_RTS); 1093 1094 switch (how) { 1095 case TIOCMBIC: 1096 CLR(sc->sc_mcr, plcombits); 1097 break; 1098 1099 case TIOCMBIS: 1100 SET(sc->sc_mcr, plcombits); 1101 break; 1102 1103 case TIOCMSET: 1104 CLR(sc->sc_mcr, MCR_DTR | MCR_RTS); 1105 SET(sc->sc_mcr, plcombits); 1106 break; 1107 } 1108 1109 if (!sc->sc_heldchange) { 1110 if (sc->sc_tx_busy) { 1111 sc->sc_heldtbc = sc->sc_tbc; 1112 sc->sc_tbc = 0; 1113 sc->sc_heldchange = 1; 1114 } else 1115 plcom_loadchannelregs(sc); 1116 } 1117 } 1118 1119 int 1120 plcom_to_tiocm(struct plcom_softc *sc) 1121 { 1122 u_char plcombits; 1123 int ttybits = 0; 1124 1125 plcombits = sc->sc_mcr; 1126 if (ISSET(plcombits, MCR_DTR)) 1127 SET(ttybits, TIOCM_DTR); 1128 if (ISSET(plcombits, MCR_RTS)) 1129 SET(ttybits, TIOCM_RTS); 1130 1131 plcombits = sc->sc_msr; 1132 if (ISSET(plcombits, MSR_DCD)) 1133 SET(ttybits, TIOCM_CD); 1134 if (ISSET(plcombits, MSR_CTS)) 1135 SET(ttybits, TIOCM_CTS); 1136 if (ISSET(plcombits, MSR_DSR)) 1137 SET(ttybits, TIOCM_DSR); 1138 1139 if (sc->sc_cr != 0) 1140 SET(ttybits, TIOCM_LE); 1141 1142 return ttybits; 1143 } 1144 1145 static u_char 1146 cflag2lcr(tcflag_t cflag) 1147 { 1148 u_char lcr = 0; 1149 1150 switch (ISSET(cflag, CSIZE)) { 1151 case CS5: 1152 SET(lcr, LCR_5BITS); 1153 break; 1154 case CS6: 1155 SET(lcr, LCR_6BITS); 1156 break; 1157 case CS7: 1158 SET(lcr, LCR_7BITS); 1159 break; 1160 case CS8: 1161 SET(lcr, LCR_8BITS); 1162 break; 1163 } 1164 if (ISSET(cflag, PARENB)) { 1165 SET(lcr, LCR_PEN); 1166 if (!ISSET(cflag, PARODD)) 1167 SET(lcr, LCR_EPS); 1168 } 1169 if (ISSET(cflag, CSTOPB)) 1170 SET(lcr, LCR_STP2); 1171 1172 return lcr; 1173 } 1174 1175 int 1176 plcomparam(struct tty *tp, struct termios *t) 1177 { 1178 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(tp->t_dev)); 1179 int ospeed; 1180 u_char lcr; 1181 int s; 1182 1183 if (PLCOM_ISALIVE(sc) == 0) 1184 return EIO; 1185 1186 ospeed = plcomspeed(t->c_ospeed, sc->sc_frequency); 1187 1188 /* Check requested parameters. */ 1189 if (ospeed < 0) 1190 return EINVAL; 1191 if (t->c_ispeed && t->c_ispeed != t->c_ospeed) 1192 return EINVAL; 1193 1194 /* 1195 * For the console, always force CLOCAL and !HUPCL, so that the port 1196 * is always active. 1197 */ 1198 if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) || 1199 ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE)) { 1200 SET(t->c_cflag, CLOCAL); 1201 CLR(t->c_cflag, HUPCL); 1202 } 1203 1204 /* 1205 * If there were no changes, don't do anything. This avoids dropping 1206 * input and improves performance when all we did was frob things like 1207 * VMIN and VTIME. 1208 */ 1209 if (tp->t_ospeed == t->c_ospeed && 1210 tp->t_cflag == t->c_cflag) 1211 return 0; 1212 1213 lcr = ISSET(sc->sc_lcr, LCR_BRK) | cflag2lcr(t->c_cflag); 1214 1215 s = splserial(); 1216 PLCOM_LOCK(sc); 1217 1218 sc->sc_lcr = lcr; 1219 1220 /* 1221 * PL010 has a fixed-length FIFO trigger point. 1222 */ 1223 if (ISSET(sc->sc_hwflags, PLCOM_HW_FIFO)) 1224 sc->sc_fifo = 1; 1225 else 1226 sc->sc_fifo = 0; 1227 1228 if (sc->sc_fifo) 1229 SET(sc->sc_lcr, LCR_FEN); 1230 1231 /* 1232 * If we're not in a mode that assumes a connection is present, then 1233 * ignore carrier changes. 1234 */ 1235 if (ISSET(t->c_cflag, CLOCAL | MDMBUF)) 1236 sc->sc_msr_dcd = 0; 1237 else 1238 sc->sc_msr_dcd = MSR_DCD; 1239 /* 1240 * Set the flow control pins depending on the current flow control 1241 * mode. 1242 */ 1243 if (ISSET(t->c_cflag, CRTSCTS)) { 1244 sc->sc_mcr_dtr = MCR_DTR; 1245 sc->sc_mcr_rts = MCR_RTS; 1246 sc->sc_msr_cts = MSR_CTS; 1247 } else if (ISSET(t->c_cflag, MDMBUF)) { 1248 /* 1249 * For DTR/DCD flow control, make sure we don't toggle DTR for 1250 * carrier detection. 1251 */ 1252 sc->sc_mcr_dtr = 0; 1253 sc->sc_mcr_rts = MCR_DTR; 1254 sc->sc_msr_cts = MSR_DCD; 1255 } else { 1256 /* 1257 * If no flow control, then always set RTS. This will make 1258 * the other side happy if it mistakenly thinks we're doing 1259 * RTS/CTS flow control. 1260 */ 1261 sc->sc_mcr_dtr = MCR_DTR | MCR_RTS; 1262 sc->sc_mcr_rts = 0; 1263 sc->sc_msr_cts = 0; 1264 if (ISSET(sc->sc_mcr, MCR_DTR)) 1265 SET(sc->sc_mcr, MCR_RTS); 1266 else 1267 CLR(sc->sc_mcr, MCR_RTS); 1268 } 1269 sc->sc_msr_mask = sc->sc_msr_cts | sc->sc_msr_dcd; 1270 1271 #if 0 1272 if (ospeed == 0) 1273 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 1274 else 1275 SET(sc->sc_mcr, sc->sc_mcr_dtr); 1276 #endif 1277 1278 sc->sc_dlbl = ospeed; 1279 sc->sc_dlbh = ospeed >> 8; 1280 1281 /* And copy to tty. */ 1282 tp->t_ispeed = 0; 1283 tp->t_ospeed = t->c_ospeed; 1284 tp->t_cflag = t->c_cflag; 1285 1286 if (!sc->sc_heldchange) { 1287 if (sc->sc_tx_busy) { 1288 sc->sc_heldtbc = sc->sc_tbc; 1289 sc->sc_tbc = 0; 1290 sc->sc_heldchange = 1; 1291 } else 1292 plcom_loadchannelregs(sc); 1293 } 1294 1295 if (!ISSET(t->c_cflag, CHWFLOW)) { 1296 /* Disable the high water mark. */ 1297 sc->sc_r_hiwat = 0; 1298 sc->sc_r_lowat = 0; 1299 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1300 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1301 plcom_schedrx(sc); 1302 } 1303 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 1304 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 1305 plcom_hwiflow(sc); 1306 } 1307 } else { 1308 sc->sc_r_hiwat = plcom_rbuf_hiwat; 1309 sc->sc_r_lowat = plcom_rbuf_lowat; 1310 } 1311 1312 PLCOM_UNLOCK(sc); 1313 splx(s); 1314 1315 /* 1316 * Update the tty layer's idea of the carrier bit, in case we changed 1317 * CLOCAL or MDMBUF. We don't hang up here; we only do that by 1318 * explicit request. 1319 */ 1320 (void) (*tp->t_linesw->l_modem)(tp, ISSET(sc->sc_msr, MSR_DCD)); 1321 1322 #ifdef PLCOM_DEBUG 1323 if (plcom_debug) 1324 plcomstatus(sc, "plcomparam "); 1325 #endif 1326 1327 if (!ISSET(t->c_cflag, CHWFLOW)) { 1328 if (sc->sc_tx_stopped) { 1329 sc->sc_tx_stopped = 0; 1330 plcomstart(tp); 1331 } 1332 } 1333 1334 return 0; 1335 } 1336 1337 void 1338 plcom_iflush(struct plcom_softc *sc) 1339 { 1340 bus_space_tag_t iot = sc->sc_iot; 1341 bus_space_handle_t ioh = sc->sc_ioh; 1342 #ifdef DIAGNOSTIC 1343 int reg; 1344 #endif 1345 int timo; 1346 1347 #ifdef DIAGNOSTIC 1348 reg = 0xffff; 1349 #endif 1350 timo = 50000; 1351 /* flush any pending I/O */ 1352 while (! ISSET(bus_space_read_1(iot, ioh, plcom_fr), FR_RXFE) 1353 && --timo) 1354 #ifdef DIAGNOSTIC 1355 reg = 1356 #else 1357 (void) 1358 #endif 1359 bus_space_read_1(iot, ioh, plcom_dr); 1360 #ifdef DIAGNOSTIC 1361 if (!timo) 1362 printf("%s: plcom_iflush timeout %02x\n", sc->sc_dev.dv_xname, 1363 reg); 1364 #endif 1365 } 1366 1367 void 1368 plcom_loadchannelregs(struct plcom_softc *sc) 1369 { 1370 bus_space_tag_t iot = sc->sc_iot; 1371 bus_space_handle_t ioh = sc->sc_ioh; 1372 1373 /* XXXXX necessary? */ 1374 plcom_iflush(sc); 1375 1376 bus_space_write_1(iot, ioh, plcom_cr, 0); 1377 1378 bus_space_write_1(iot, ioh, plcom_dlbl, sc->sc_dlbl); 1379 bus_space_write_1(iot, ioh, plcom_dlbh, sc->sc_dlbh); 1380 bus_space_write_1(iot, ioh, plcom_lcr, sc->sc_lcr); 1381 /* XXX device_unit() abuse */ 1382 sc->sc_set_mcr(sc->sc_set_mcr_arg, device_unit(&sc->sc_dev), 1383 sc->sc_mcr_active = sc->sc_mcr); 1384 1385 bus_space_write_1(iot, ioh, plcom_cr, sc->sc_cr); 1386 } 1387 1388 int 1389 plcomhwiflow(struct tty *tp, int block) 1390 { 1391 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(tp->t_dev)); 1392 int s; 1393 1394 if (PLCOM_ISALIVE(sc) == 0) 1395 return 0; 1396 1397 if (sc->sc_mcr_rts == 0) 1398 return 0; 1399 1400 s = splserial(); 1401 PLCOM_LOCK(sc); 1402 1403 if (block) { 1404 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1405 SET(sc->sc_rx_flags, RX_TTY_BLOCKED); 1406 plcom_hwiflow(sc); 1407 } 1408 } else { 1409 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1410 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1411 plcom_schedrx(sc); 1412 } 1413 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1414 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED); 1415 plcom_hwiflow(sc); 1416 } 1417 } 1418 1419 PLCOM_UNLOCK(sc); 1420 splx(s); 1421 return 1; 1422 } 1423 1424 /* 1425 * (un)block input via hw flowcontrol 1426 */ 1427 void 1428 plcom_hwiflow(struct plcom_softc *sc) 1429 { 1430 if (sc->sc_mcr_rts == 0) 1431 return; 1432 1433 if (ISSET(sc->sc_rx_flags, RX_ANY_BLOCK)) { 1434 CLR(sc->sc_mcr, sc->sc_mcr_rts); 1435 CLR(sc->sc_mcr_active, sc->sc_mcr_rts); 1436 } else { 1437 SET(sc->sc_mcr, sc->sc_mcr_rts); 1438 SET(sc->sc_mcr_active, sc->sc_mcr_rts); 1439 } 1440 /* XXX device_unit() abuse */ 1441 sc->sc_set_mcr(sc->sc_set_mcr_arg, device_unit(&sc->sc_dev), 1442 sc->sc_mcr_active); 1443 } 1444 1445 1446 void 1447 plcomstart(struct tty *tp) 1448 { 1449 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(tp->t_dev)); 1450 bus_space_tag_t iot = sc->sc_iot; 1451 bus_space_handle_t ioh = sc->sc_ioh; 1452 int s; 1453 1454 if (PLCOM_ISALIVE(sc) == 0) 1455 return; 1456 1457 s = spltty(); 1458 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 1459 goto out; 1460 if (sc->sc_tx_stopped) 1461 goto out; 1462 1463 if (tp->t_outq.c_cc <= tp->t_lowat) { 1464 if (ISSET(tp->t_state, TS_ASLEEP)) { 1465 CLR(tp->t_state, TS_ASLEEP); 1466 wakeup(&tp->t_outq); 1467 } 1468 selwakeup(&tp->t_wsel); 1469 if (tp->t_outq.c_cc == 0) 1470 goto out; 1471 } 1472 1473 /* Grab the first contiguous region of buffer space. */ 1474 { 1475 u_char *tba; 1476 int tbc; 1477 1478 tba = tp->t_outq.c_cf; 1479 tbc = ndqb(&tp->t_outq, 0); 1480 1481 (void)splserial(); 1482 PLCOM_LOCK(sc); 1483 1484 sc->sc_tba = tba; 1485 sc->sc_tbc = tbc; 1486 } 1487 1488 SET(tp->t_state, TS_BUSY); 1489 sc->sc_tx_busy = 1; 1490 1491 /* Enable transmit completion interrupts if necessary. */ 1492 if (!ISSET(sc->sc_cr, CR_TIE)) { 1493 SET(sc->sc_cr, CR_TIE); 1494 bus_space_write_1(iot, ioh, plcom_cr, sc->sc_cr); 1495 } 1496 1497 /* Output the first chunk of the contiguous buffer. */ 1498 { 1499 int n; 1500 1501 n = sc->sc_tbc; 1502 if (n > sc->sc_fifolen) 1503 n = sc->sc_fifolen; 1504 bus_space_write_multi_1(iot, ioh, plcom_dr, sc->sc_tba, n); 1505 sc->sc_tbc -= n; 1506 sc->sc_tba += n; 1507 } 1508 PLCOM_UNLOCK(sc); 1509 out: 1510 splx(s); 1511 return; 1512 } 1513 1514 /* 1515 * Stop output on a line. 1516 */ 1517 void 1518 plcomstop(struct tty *tp, int flag) 1519 { 1520 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(tp->t_dev)); 1521 int s; 1522 1523 s = splserial(); 1524 PLCOM_LOCK(sc); 1525 if (ISSET(tp->t_state, TS_BUSY)) { 1526 /* Stop transmitting at the next chunk. */ 1527 sc->sc_tbc = 0; 1528 sc->sc_heldtbc = 0; 1529 if (!ISSET(tp->t_state, TS_TTSTOP)) 1530 SET(tp->t_state, TS_FLUSH); 1531 } 1532 PLCOM_UNLOCK(sc); 1533 splx(s); 1534 } 1535 1536 void 1537 plcomdiag(void *arg) 1538 { 1539 struct plcom_softc *sc = arg; 1540 int overflows, floods; 1541 int s; 1542 1543 s = splserial(); 1544 PLCOM_LOCK(sc); 1545 overflows = sc->sc_overflows; 1546 sc->sc_overflows = 0; 1547 floods = sc->sc_floods; 1548 sc->sc_floods = 0; 1549 sc->sc_errors = 0; 1550 PLCOM_UNLOCK(sc); 1551 splx(s); 1552 1553 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1554 sc->sc_dev.dv_xname, 1555 overflows, overflows == 1 ? "" : "s", 1556 floods, floods == 1 ? "" : "s"); 1557 } 1558 1559 integrate void 1560 plcom_rxsoft(struct plcom_softc *sc, struct tty *tp) 1561 { 1562 int (*rint) (int, struct tty *) = tp->t_linesw->l_rint; 1563 u_char *get, *end; 1564 u_int cc, scc; 1565 u_char rsr; 1566 int code; 1567 int s; 1568 1569 end = sc->sc_ebuf; 1570 get = sc->sc_rbget; 1571 scc = cc = plcom_rbuf_size - sc->sc_rbavail; 1572 1573 if (cc == plcom_rbuf_size) { 1574 sc->sc_floods++; 1575 if (sc->sc_errors++ == 0) 1576 callout_reset(&sc->sc_diag_callout, 60 * hz, 1577 plcomdiag, sc); 1578 } 1579 1580 while (cc) { 1581 code = get[0]; 1582 rsr = get[1]; 1583 if (ISSET(rsr, RSR_OE | RSR_BE | RSR_FE | RSR_PE)) { 1584 if (ISSET(rsr, RSR_OE)) { 1585 sc->sc_overflows++; 1586 if (sc->sc_errors++ == 0) 1587 callout_reset(&sc->sc_diag_callout, 1588 60 * hz, plcomdiag, sc); 1589 } 1590 if (ISSET(rsr, RSR_BE | RSR_FE)) 1591 SET(code, TTY_FE); 1592 if (ISSET(rsr, RSR_PE)) 1593 SET(code, TTY_PE); 1594 } 1595 if ((*rint)(code, tp) == -1) { 1596 /* 1597 * The line discipline's buffer is out of space. 1598 */ 1599 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1600 /* 1601 * We're either not using flow control, or the 1602 * line discipline didn't tell us to block for 1603 * some reason. Either way, we have no way to 1604 * know when there's more space available, so 1605 * just drop the rest of the data. 1606 */ 1607 get += cc << 1; 1608 if (get >= end) 1609 get -= plcom_rbuf_size << 1; 1610 cc = 0; 1611 } else { 1612 /* 1613 * Don't schedule any more receive processing 1614 * until the line discipline tells us there's 1615 * space available (through plcomhwiflow()). 1616 * Leave the rest of the data in the input 1617 * buffer. 1618 */ 1619 SET(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1620 } 1621 break; 1622 } 1623 get += 2; 1624 if (get >= end) 1625 get = sc->sc_rbuf; 1626 cc--; 1627 } 1628 1629 if (cc != scc) { 1630 sc->sc_rbget = get; 1631 s = splserial(); 1632 PLCOM_LOCK(sc); 1633 1634 cc = sc->sc_rbavail += scc - cc; 1635 /* Buffers should be ok again, release possible block. */ 1636 if (cc >= sc->sc_r_lowat) { 1637 if (ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1638 CLR(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1639 SET(sc->sc_cr, CR_RIE | CR_RTIE); 1640 bus_space_write_1(sc->sc_iot, sc->sc_ioh, plcom_cr, sc->sc_cr); 1641 } 1642 if (ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED)) { 1643 CLR(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1644 plcom_hwiflow(sc); 1645 } 1646 } 1647 PLCOM_UNLOCK(sc); 1648 splx(s); 1649 } 1650 } 1651 1652 integrate void 1653 plcom_txsoft(struct plcom_softc *sc, struct tty *tp) 1654 { 1655 1656 CLR(tp->t_state, TS_BUSY); 1657 if (ISSET(tp->t_state, TS_FLUSH)) 1658 CLR(tp->t_state, TS_FLUSH); 1659 else 1660 ndflush(&tp->t_outq, (int)(sc->sc_tba - tp->t_outq.c_cf)); 1661 (*tp->t_linesw->l_start)(tp); 1662 } 1663 1664 integrate void 1665 plcom_stsoft(struct plcom_softc *sc, struct tty *tp) 1666 { 1667 u_char msr, delta; 1668 int s; 1669 1670 s = splserial(); 1671 PLCOM_LOCK(sc); 1672 msr = sc->sc_msr; 1673 delta = sc->sc_msr_delta; 1674 sc->sc_msr_delta = 0; 1675 PLCOM_UNLOCK(sc); 1676 splx(s); 1677 1678 if (ISSET(delta, sc->sc_msr_dcd)) { 1679 /* 1680 * Inform the tty layer that carrier detect changed. 1681 */ 1682 (void) (*tp->t_linesw->l_modem)(tp, ISSET(msr, MSR_DCD)); 1683 } 1684 1685 if (ISSET(delta, sc->sc_msr_cts)) { 1686 /* Block or unblock output according to flow control. */ 1687 if (ISSET(msr, sc->sc_msr_cts)) { 1688 sc->sc_tx_stopped = 0; 1689 (*tp->t_linesw->l_start)(tp); 1690 } else { 1691 sc->sc_tx_stopped = 1; 1692 } 1693 } 1694 1695 #ifdef PLCOM_DEBUG 1696 if (plcom_debug) 1697 plcomstatus(sc, "plcom_stsoft"); 1698 #endif 1699 } 1700 1701 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 1702 void 1703 plcomsoft(void *arg) 1704 { 1705 struct plcom_softc *sc = arg; 1706 struct tty *tp; 1707 1708 if (PLCOM_ISALIVE(sc) == 0) 1709 return; 1710 1711 { 1712 #else 1713 void 1714 #ifndef __NO_SOFT_SERIAL_INTERRUPT 1715 plcomsoft(void) 1716 #else 1717 plcomsoft(void *arg) 1718 #endif 1719 { 1720 struct plcom_softc *sc; 1721 struct tty *tp; 1722 int unit; 1723 #ifdef __NO_SOFT_SERIAL_INTERRUPT 1724 int s; 1725 1726 s = splsoftserial(); 1727 plcom_softintr_scheduled = 0; 1728 #endif 1729 1730 for (unit = 0; unit < plcom_cd.cd_ndevs; unit++) { 1731 sc = device_lookup(&plcom_cd, unit); 1732 if (sc == NULL || !ISSET(sc->sc_hwflags, PLCOM_HW_DEV_OK)) 1733 continue; 1734 1735 if (PLCOM_ISALIVE(sc) == 0) 1736 continue; 1737 1738 tp = sc->sc_tty; 1739 if (tp == NULL) 1740 continue; 1741 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) 1742 continue; 1743 #endif 1744 tp = sc->sc_tty; 1745 1746 if (sc->sc_rx_ready) { 1747 sc->sc_rx_ready = 0; 1748 plcom_rxsoft(sc, tp); 1749 } 1750 1751 if (sc->sc_st_check) { 1752 sc->sc_st_check = 0; 1753 plcom_stsoft(sc, tp); 1754 } 1755 1756 if (sc->sc_tx_done) { 1757 sc->sc_tx_done = 0; 1758 plcom_txsoft(sc, tp); 1759 } 1760 } 1761 1762 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS 1763 #ifdef __NO_SOFT_SERIAL_INTERRUPT 1764 splx(s); 1765 #endif 1766 #endif 1767 } 1768 1769 #ifdef __ALIGN_BRACKET_LEVEL_FOR_CTAGS 1770 /* there has got to be a better way to do plcomsoft() */ 1771 }} 1772 #endif 1773 1774 int 1775 plcomintr(void *arg) 1776 { 1777 struct plcom_softc *sc = arg; 1778 bus_space_tag_t iot = sc->sc_iot; 1779 bus_space_handle_t ioh = sc->sc_ioh; 1780 u_char *put, *end; 1781 u_int cc; 1782 u_char rsr, iir; 1783 1784 if (PLCOM_ISALIVE(sc) == 0) 1785 return 0; 1786 1787 PLCOM_LOCK(sc); 1788 iir = bus_space_read_1(iot, ioh, plcom_iir); 1789 if (! ISSET(iir, IIR_IMASK)) { 1790 PLCOM_UNLOCK(sc); 1791 return 0; 1792 } 1793 1794 end = sc->sc_ebuf; 1795 put = sc->sc_rbput; 1796 cc = sc->sc_rbavail; 1797 1798 do { 1799 u_char msr, delta, fr; 1800 1801 fr = bus_space_read_1(iot, ioh, plcom_fr); 1802 1803 if (!ISSET(fr, FR_RXFE) && 1804 !ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1805 while (cc > 0) { 1806 int cn_trapped = 0; 1807 put[0] = bus_space_read_1(iot, ioh, 1808 plcom_dr); 1809 rsr = bus_space_read_1(iot, ioh, plcom_rsr); 1810 /* Clear any error status. */ 1811 if (ISSET(rsr, 1812 (RSR_BE | RSR_OE | RSR_PE | RSR_FE))) 1813 bus_space_write_1(iot, ioh, plcom_ecr, 1814 0); 1815 if (ISSET(rsr, RSR_BE)) { 1816 cn_trapped = 0; 1817 cn_check_magic(sc->sc_tty->t_dev, 1818 CNC_BREAK, plcom_cnm_state); 1819 if (cn_trapped) 1820 continue; 1821 #if defined(KGDB) 1822 if (ISSET(sc->sc_hwflags, 1823 PLCOM_HW_KGDB)) { 1824 kgdb_connect(1); 1825 continue; 1826 } 1827 #endif 1828 } 1829 1830 put[1] = rsr; 1831 cn_trapped = 0; 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 /* XXX device_unit() abuse */ 2144 sc->sc_set_mcr(sc->sc_set_mcr_arg, device_unit(&sc->sc_dev), 2145 MCR_DTR | MCR_RTS); 2146 #endif 2147 2148 *iohp = ioh; 2149 return 0; 2150 } 2151 2152 /* 2153 * Following are all routines needed for PLCOM to act as console 2154 */ 2155 struct consdev plcomcons = { 2156 NULL, NULL, plcomcngetc, plcomcnputc, plcomcnpollc, NULL, 2157 NULL, NULL, NODEV, CN_NORMAL 2158 }; 2159 2160 2161 int 2162 plcomcnattach(bus_space_tag_t iot, bus_addr_t iobase, int rate, int frequency, 2163 tcflag_t cflag, int unit) 2164 { 2165 int res; 2166 2167 res = plcominit(iot, iobase, rate, frequency, cflag, &plcomconsioh); 2168 if (res) 2169 return res; 2170 2171 cn_tab = &plcomcons; 2172 cn_init_magic(&plcom_cnm_state); 2173 cn_set_magic("\047\001"); /* default magic is BREAK */ 2174 2175 plcomconstag = iot; 2176 plcomconsunit = unit; 2177 plcomconsrate = rate; 2178 plcomconscflag = cflag; 2179 2180 return 0; 2181 } 2182 2183 void 2184 plcomcndetach(void) 2185 { 2186 bus_space_unmap(plcomconstag, plcomconsioh, PLCOM_UART_SIZE); 2187 plcomconstag = NULL; 2188 2189 cn_tab = NULL; 2190 } 2191 2192 int 2193 plcomcngetc(dev_t dev) 2194 { 2195 return plcom_common_getc(dev, plcomconstag, plcomconsioh); 2196 } 2197 2198 /* 2199 * Console kernel output character routine. 2200 */ 2201 void 2202 plcomcnputc(dev_t dev, int c) 2203 { 2204 plcom_common_putc(dev, plcomconstag, plcomconsioh, c); 2205 } 2206 2207 void 2208 plcomcnpollc(dev_t dev, int on) 2209 { 2210 2211 } 2212 2213 #ifdef KGDB 2214 int 2215 plcom_kgdb_attach(bus_space_tag_t iot, bus_addr_t iobase, int rate, 2216 int frequency, tcflag_t cflag, int unit) 2217 { 2218 int res; 2219 2220 if (iot == plcomconstag && iobase == plcomconsunit) 2221 return EBUSY; /* cannot share with console */ 2222 2223 res = plcominit(iot, iobase, rate, frequency, cflag, &plcom_kgdb_ioh); 2224 if (res) 2225 return res; 2226 2227 kgdb_attach(plcom_kgdb_getc, plcom_kgdb_putc, NULL); 2228 kgdb_dev = 123; /* unneeded, only to satisfy some tests */ 2229 2230 plcom_kgdb_iot = iot; 2231 plcom_kgdb_unit = unit; 2232 2233 return 0; 2234 } 2235 2236 /* ARGSUSED */ 2237 int 2238 plcom_kgdb_getc(void *arg) 2239 { 2240 return plcom_common_getc(NODEV, plcom_kgdb_iot, plcom_kgdb_ioh); 2241 } 2242 2243 /* ARGSUSED */ 2244 void 2245 plcom_kgdb_putc(void *arg, int c) 2246 { 2247 plcom_common_putc(NODEV, plcom_kgdb_iot, plcom_kgdb_ioh, c); 2248 } 2249 #endif /* KGDB */ 2250 2251 /* helper function to identify the plcom ports used by 2252 console or KGDB (and not yet autoconf attached) */ 2253 int 2254 plcom_is_console(bus_space_tag_t iot, int unit, 2255 bus_space_handle_t *ioh) 2256 { 2257 bus_space_handle_t help; 2258 2259 if (!plcomconsattached && 2260 iot == plcomconstag && unit == plcomconsunit) 2261 help = plcomconsioh; 2262 #ifdef KGDB 2263 else if (!plcom_kgdb_attached && 2264 iot == plcom_kgdb_iot && unit == plcom_kgdb_unit) 2265 help = plcom_kgdb_ioh; 2266 #endif 2267 else 2268 return 0; 2269 2270 if (ioh) 2271 *ioh = help; 2272 return 1; 2273 } 2274
Indexes created Fri Sep 26 20:09:58 GMT 2025