plcom.c revision 1.14.4.3
1 /* $NetBSD: plcom.c,v 1.14.4.3 2006/04/19 02:32:21 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 1.14.4.3 2006/04/19 02:32:21 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> 146 147 #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 device_is_active(&(sc)->sc_dev)) 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 #define PLCOM_LOCK(sc) simple_lock(&(sc)->sc_lock) 275 #define PLCOM_UNLOCK(sc) simple_unlock(&(sc)->sc_lock) 276 277 int 278 plcomspeed(long speed, long frequency) 279 { 280 #define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */ 281 282 int x, err; 283 284 #if 0 285 if (speed == 0) 286 return 0; 287 #endif 288 if (speed <= 0) 289 return -1; 290 x = divrnd(frequency / 16, speed); 291 if (x <= 0) 292 return -1; 293 err = divrnd(((quad_t)frequency) * 1000 / 16, speed * x) - 1000; 294 if (err < 0) 295 err = -err; 296 if (err > PLCOM_TOLERANCE) 297 return -1; 298 return x; 299 300 #undef divrnd 301 } 302 303 #ifdef PLCOM_DEBUG 304 int plcom_debug = 0; 305 306 void plcomstatus (struct plcom_softc *, char *); 307 void 308 plcomstatus(struct plcom_softc *sc, char *str) 309 { 310 struct tty *tp = sc->sc_tty; 311 312 printf("%s: %s %sclocal %sdcd %sts_carr_on %sdtr %stx_stopped\n", 313 sc->sc_dev.dv_xname, str, 314 ISSET(tp->t_cflag, CLOCAL) ? "+" : "-", 315 ISSET(sc->sc_msr, MSR_DCD) ? "+" : "-", 316 ISSET(tp->t_state, TS_CARR_ON) ? "+" : "-", 317 ISSET(sc->sc_mcr, MCR_DTR) ? "+" : "-", 318 sc->sc_tx_stopped ? "+" : "-"); 319 320 printf("%s: %s %scrtscts %scts %sts_ttstop %srts %xrx_flags\n", 321 sc->sc_dev.dv_xname, str, 322 ISSET(tp->t_cflag, CRTSCTS) ? "+" : "-", 323 ISSET(sc->sc_msr, MSR_CTS) ? "+" : "-", 324 ISSET(tp->t_state, TS_TTSTOP) ? "+" : "-", 325 ISSET(sc->sc_mcr, MCR_RTS) ? "+" : "-", 326 sc->sc_rx_flags); 327 } 328 #endif 329 330 int 331 plcomprobe1(bus_space_tag_t iot, bus_space_handle_t ioh) 332 { 333 int data; 334 335 /* Disable the UART. */ 336 bus_space_write_1(iot, ioh, plcom_cr, 0); 337 /* Make sure the FIFO is off. */ 338 bus_space_write_1(iot, ioh, plcom_lcr, LCR_8BITS); 339 /* Disable interrupts. */ 340 bus_space_write_1(iot, ioh, plcom_iir, 0); 341 342 /* Make sure we swallow anything in the receiving register. */ 343 data = bus_space_read_1(iot, ioh, plcom_dr); 344 345 if (bus_space_read_1(iot, ioh, plcom_lcr) != LCR_8BITS) 346 return 0; 347 348 data = bus_space_read_1(iot, ioh, plcom_fr) & (FR_RXFF | FR_RXFE); 349 350 if (data != FR_RXFE) 351 return 0; 352 353 return 1; 354 } 355 356 static void 357 plcom_enable_debugport(struct plcom_softc *sc) 358 { 359 int s; 360 361 /* Turn on line break interrupt, set carrier. */ 362 s = splserial(); 363 PLCOM_LOCK(sc); 364 sc->sc_cr = CR_RIE | CR_RTIE | CR_UARTEN; 365 bus_space_write_1(sc->sc_iot, sc->sc_ioh, plcom_cr, sc->sc_cr); 366 SET(sc->sc_mcr, MCR_DTR | MCR_RTS); 367 /* XXX device_unit() abuse */ 368 sc->sc_set_mcr(sc->sc_set_mcr_arg, device_unit(&sc->sc_dev), 369 sc->sc_mcr); 370 PLCOM_UNLOCK(sc); 371 splx(s); 372 } 373 374 void 375 plcom_attach_subr(struct plcom_softc *sc) 376 { 377 int unit = sc->sc_iounit; 378 bus_space_tag_t iot = sc->sc_iot; 379 bus_space_handle_t ioh = sc->sc_ioh; 380 struct tty *tp; 381 382 callout_init(&sc->sc_diag_callout); 383 simple_lock_init(&sc->sc_lock); 384 385 /* Disable interrupts before configuring the device. */ 386 sc->sc_cr = 0; 387 388 if (plcomconstag && unit == plcomconsunit) { 389 plcomconsattached = 1; 390 391 plcomconstag = iot; 392 plcomconsioh = ioh; 393 394 /* Make sure the console is always "hardwired". */ 395 delay(1000); /* wait for output to finish */ 396 SET(sc->sc_hwflags, PLCOM_HW_CONSOLE); 397 SET(sc->sc_swflags, TIOCFLAG_SOFTCAR); 398 /* Must re-enable the console immediately, or we will 399 hang when trying to print. */ 400 sc->sc_cr = CR_UARTEN; 401 } 402 403 bus_space_write_1(iot, ioh, plcom_cr, sc->sc_cr); 404 405 /* The PL010 has a 16-byte fifo, but the tx interrupt triggers when 406 there is space for 8 more bytes. */ 407 sc->sc_fifolen = 8; 408 printf("\n"); 409 410 if (ISSET(sc->sc_hwflags, PLCOM_HW_TXFIFO_DISABLE)) { 411 sc->sc_fifolen = 1; 412 printf("%s: txfifo disabled\n", sc->sc_dev.dv_xname); 413 } 414 415 if (sc->sc_fifolen > 1) 416 SET(sc->sc_hwflags, PLCOM_HW_FIFO); 417 418 tp = ttymalloc(); 419 tp->t_oproc = plcomstart; 420 tp->t_param = plcomparam; 421 tp->t_hwiflow = plcomhwiflow; 422 423 sc->sc_tty = tp; 424 sc->sc_rbuf = malloc(plcom_rbuf_size << 1, M_DEVBUF, M_NOWAIT); 425 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 426 sc->sc_rbavail = plcom_rbuf_size; 427 if (sc->sc_rbuf == NULL) { 428 printf("%s: unable to allocate ring buffer\n", 429 sc->sc_dev.dv_xname); 430 return; 431 } 432 sc->sc_ebuf = sc->sc_rbuf + (plcom_rbuf_size << 1); 433 434 tty_attach(tp); 435 436 if (ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE)) { 437 int maj; 438 439 /* locate the major number */ 440 maj = cdevsw_lookup_major(&plcom_cdevsw); 441 442 cn_tab->cn_dev = makedev(maj, device_unit(&sc->sc_dev)); 443 444 printf("%s: console\n", sc->sc_dev.dv_xname); 445 } 446 447 #ifdef KGDB 448 /* 449 * Allow kgdb to "take over" this port. If this is 450 * the kgdb device, it has exclusive use. 451 */ 452 if (iot == plcom_kgdb_iot && unit == plcom_kgdb_unit) { 453 plcom_kgdb_attached = 1; 454 455 SET(sc->sc_hwflags, PLCOM_HW_KGDB); 456 printf("%s: kgdb\n", sc->sc_dev.dv_xname); 457 } 458 #endif 459 460 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 461 sc->sc_si = softintr_establish(IPL_SOFTSERIAL, plcomsoft, sc); 462 #endif 463 464 #if NRND > 0 && defined(RND_COM) 465 rnd_attach_source(&sc->rnd_source, sc->sc_dev.dv_xname, 466 RND_TYPE_TTY, 0); 467 #endif 468 469 /* if there are no enable/disable functions, assume the device 470 is always enabled */ 471 if (!sc->enable) 472 sc->enabled = 1; 473 474 plcom_config(sc); 475 476 SET(sc->sc_hwflags, PLCOM_HW_DEV_OK); 477 } 478 479 void 480 plcom_config(struct plcom_softc *sc) 481 { 482 bus_space_tag_t iot = sc->sc_iot; 483 bus_space_handle_t ioh = sc->sc_ioh; 484 485 /* Disable interrupts before configuring the device. */ 486 sc->sc_cr = 0; 487 bus_space_write_1(iot, ioh, plcom_cr, sc->sc_cr); 488 489 if (ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE|PLCOM_HW_KGDB)) 490 plcom_enable_debugport(sc); 491 } 492 493 int 494 plcom_detach(self, flags) 495 struct device *self; 496 int flags; 497 { 498 struct plcom_softc *sc = (struct plcom_softc *)self; 499 int maj, mn; 500 501 /* locate the major number */ 502 maj = cdevsw_lookup_major(&plcom_cdevsw); 503 504 /* Nuke the vnodes for any open instances. */ 505 mn = device_unit(self); 506 vdevgone(maj, mn, mn, VCHR); 507 508 mn |= PLCOMDIALOUT_MASK; 509 vdevgone(maj, mn, mn, VCHR); 510 511 /* Free the receive buffer. */ 512 free(sc->sc_rbuf, M_DEVBUF); 513 514 /* Detach and free the tty. */ 515 tty_detach(sc->sc_tty); 516 ttyfree(sc->sc_tty); 517 518 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 519 /* Unhook the soft interrupt handler. */ 520 softintr_disestablish(sc->sc_si); 521 #endif 522 523 #if NRND > 0 && defined(RND_COM) 524 /* Unhook the entropy source. */ 525 rnd_detach_source(&sc->rnd_source); 526 #endif 527 528 return 0; 529 } 530 531 int 532 plcom_activate(struct device *self, enum devact act) 533 { 534 struct plcom_softc *sc = (struct plcom_softc *)self; 535 int s, rv = 0; 536 537 s = splserial(); 538 PLCOM_LOCK(sc); 539 switch (act) { 540 case DVACT_ACTIVATE: 541 rv = EOPNOTSUPP; 542 break; 543 544 case DVACT_DEACTIVATE: 545 if (sc->sc_hwflags & (PLCOM_HW_CONSOLE|PLCOM_HW_KGDB)) { 546 rv = EBUSY; 547 break; 548 } 549 550 if (sc->disable != NULL && sc->enabled != 0) { 551 (*sc->disable)(sc); 552 sc->enabled = 0; 553 } 554 break; 555 } 556 557 PLCOM_UNLOCK(sc); 558 splx(s); 559 return rv; 560 } 561 562 void 563 plcom_shutdown(struct plcom_softc *sc) 564 { 565 struct tty *tp = sc->sc_tty; 566 int s; 567 568 s = splserial(); 569 PLCOM_LOCK(sc); 570 571 /* If we were asserting flow control, then deassert it. */ 572 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 573 plcom_hwiflow(sc); 574 575 /* Clear any break condition set with TIOCSBRK. */ 576 plcom_break(sc, 0); 577 578 /* Turn off PPS capture on last close. */ 579 sc->sc_ppsmask = 0; 580 sc->ppsparam.mode = 0; 581 582 /* 583 * Hang up if necessary. Wait a bit, so the other side has time to 584 * notice even if we immediately open the port again. 585 * Avoid tsleeping above splhigh(). 586 */ 587 if (ISSET(tp->t_cflag, HUPCL)) { 588 plcom_modem(sc, 0); 589 PLCOM_UNLOCK(sc); 590 splx(s); 591 /* XXX tsleep will only timeout */ 592 (void) tsleep(sc, TTIPRI, ttclos, hz); 593 s = splserial(); 594 PLCOM_LOCK(sc); 595 } 596 597 /* Turn off interrupts. */ 598 if (ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE)) 599 /* interrupt on break */ 600 sc->sc_cr = CR_RIE | CR_RTIE | CR_UARTEN; 601 else 602 sc->sc_cr = 0; 603 bus_space_write_1(sc->sc_iot, sc->sc_ioh, plcom_cr, sc->sc_cr); 604 605 if (sc->disable) { 606 #ifdef DIAGNOSTIC 607 if (!sc->enabled) 608 panic("plcom_shutdown: not enabled?"); 609 #endif 610 (*sc->disable)(sc); 611 sc->enabled = 0; 612 } 613 PLCOM_UNLOCK(sc); 614 splx(s); 615 } 616 617 int 618 plcomopen(dev_t dev, int flag, int mode, struct lwp *l) 619 { 620 struct plcom_softc *sc; 621 struct tty *tp; 622 int s, s2; 623 int error; 624 625 sc = device_lookup(&plcom_cd, PLCOMUNIT(dev)); 626 if (sc == NULL || !ISSET(sc->sc_hwflags, PLCOM_HW_DEV_OK) || 627 sc->sc_rbuf == NULL) 628 return ENXIO; 629 630 if (!device_is_active(&sc->sc_dev)) 631 return ENXIO; 632 633 #ifdef KGDB 634 /* 635 * If this is the kgdb port, no other use is permitted. 636 */ 637 if (ISSET(sc->sc_hwflags, PLCOM_HW_KGDB)) 638 return EBUSY; 639 #endif 640 641 tp = sc->sc_tty; 642 643 if (ISSET(tp->t_state, TS_ISOPEN) && 644 ISSET(tp->t_state, TS_XCLUDE) && 645 kauth_authorize_generic(l->l_proc->p_cred, 646 KAUTH_GENERIC_ISSUSER, 647 &l->l_proc->p_acflag) != 0) 648 return EBUSY; 649 650 s = spltty(); 651 652 /* 653 * Do the following iff this is a first open. 654 */ 655 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 656 struct termios t; 657 658 tp->t_dev = dev; 659 660 s2 = splserial(); 661 PLCOM_LOCK(sc); 662 663 if (sc->enable) { 664 if ((*sc->enable)(sc)) { 665 PLCOM_UNLOCK(sc); 666 splx(s2); 667 splx(s); 668 printf("%s: device enable failed\n", 669 sc->sc_dev.dv_xname); 670 return EIO; 671 } 672 sc->enabled = 1; 673 plcom_config(sc); 674 } 675 676 /* Turn on interrupts. */ 677 /* IER_ERXRDY | IER_ERLS | IER_EMSC; */ 678 sc->sc_cr = CR_RIE | CR_RTIE | CR_MSIE | CR_UARTEN; 679 bus_space_write_1(sc->sc_iot, sc->sc_ioh, plcom_cr, sc->sc_cr); 680 681 /* Fetch the current modem control status, needed later. */ 682 sc->sc_msr = bus_space_read_1(sc->sc_iot, sc->sc_ioh, plcom_fr); 683 684 /* Clear PPS capture state on first open. */ 685 sc->sc_ppsmask = 0; 686 sc->ppsparam.mode = 0; 687 688 PLCOM_UNLOCK(sc); 689 splx(s2); 690 691 /* 692 * Initialize the termios status to the defaults. Add in the 693 * sticky bits from TIOCSFLAGS. 694 */ 695 t.c_ispeed = 0; 696 if (ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE)) { 697 t.c_ospeed = plcomconsrate; 698 t.c_cflag = plcomconscflag; 699 } else { 700 t.c_ospeed = TTYDEF_SPEED; 701 t.c_cflag = TTYDEF_CFLAG; 702 } 703 if (ISSET(sc->sc_swflags, TIOCFLAG_CLOCAL)) 704 SET(t.c_cflag, CLOCAL); 705 if (ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS)) 706 SET(t.c_cflag, CRTSCTS); 707 if (ISSET(sc->sc_swflags, TIOCFLAG_MDMBUF)) 708 SET(t.c_cflag, MDMBUF); 709 /* Make sure plcomparam() will do something. */ 710 tp->t_ospeed = 0; 711 (void) plcomparam(tp, &t); 712 tp->t_iflag = TTYDEF_IFLAG; 713 tp->t_oflag = TTYDEF_OFLAG; 714 tp->t_lflag = TTYDEF_LFLAG; 715 ttychars(tp); 716 ttsetwater(tp); 717 718 s2 = splserial(); 719 PLCOM_LOCK(sc); 720 721 /* 722 * Turn on DTR. We must always do this, even if carrier is not 723 * present, because otherwise we'd have to use TIOCSDTR 724 * immediately after setting CLOCAL, which applications do not 725 * expect. We always assert DTR while the device is open 726 * unless explicitly requested to deassert it. 727 */ 728 plcom_modem(sc, 1); 729 730 /* Clear the input ring, and unblock. */ 731 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 732 sc->sc_rbavail = plcom_rbuf_size; 733 plcom_iflush(sc); 734 CLR(sc->sc_rx_flags, RX_ANY_BLOCK); 735 plcom_hwiflow(sc); 736 737 #ifdef PLCOM_DEBUG 738 if (plcom_debug) 739 plcomstatus(sc, "plcomopen "); 740 #endif 741 742 PLCOM_UNLOCK(sc); 743 splx(s2); 744 } 745 746 splx(s); 747 748 error = ttyopen(tp, PLCOMDIALOUT(dev), ISSET(flag, O_NONBLOCK)); 749 if (error) 750 goto bad; 751 752 error = (*tp->t_linesw->l_open)(dev, tp); 753 if (error) 754 goto bad; 755 756 return 0; 757 758 bad: 759 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 760 /* 761 * We failed to open the device, and nobody else had it opened. 762 * Clean up the state as appropriate. 763 */ 764 plcom_shutdown(sc); 765 } 766 767 return error; 768 } 769 770 int 771 plcomclose(dev_t dev, int flag, int mode, struct lwp *l) 772 { 773 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(dev)); 774 struct tty *tp = sc->sc_tty; 775 776 /* XXX This is for cons.c. */ 777 if (!ISSET(tp->t_state, TS_ISOPEN)) 778 return 0; 779 780 (*tp->t_linesw->l_close)(tp, flag); 781 ttyclose(tp); 782 783 if (PLCOM_ISALIVE(sc) == 0) 784 return 0; 785 786 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 787 /* 788 * Although we got a last close, the device may still be in 789 * use; e.g. if this was the dialout node, and there are still 790 * processes waiting for carrier on the non-dialout node. 791 */ 792 plcom_shutdown(sc); 793 } 794 795 return 0; 796 } 797 798 int 799 plcomread(dev_t dev, struct uio *uio, int flag) 800 { 801 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(dev)); 802 struct tty *tp = sc->sc_tty; 803 804 if (PLCOM_ISALIVE(sc) == 0) 805 return EIO; 806 807 return (*tp->t_linesw->l_read)(tp, uio, flag); 808 } 809 810 int 811 plcomwrite(dev_t dev, struct uio *uio, int flag) 812 { 813 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(dev)); 814 struct tty *tp = sc->sc_tty; 815 816 if (PLCOM_ISALIVE(sc) == 0) 817 return EIO; 818 819 return (*tp->t_linesw->l_write)(tp, uio, flag); 820 } 821 822 int 823 plcompoll(dev_t dev, int events, struct lwp *l) 824 { 825 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(dev)); 826 struct tty *tp = sc->sc_tty; 827 828 if (PLCOM_ISALIVE(sc) == 0) 829 return EIO; 830 831 return (*tp->t_linesw->l_poll)(tp, events, l); 832 } 833 834 struct tty * 835 plcomtty(dev_t dev) 836 { 837 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(dev)); 838 struct tty *tp = sc->sc_tty; 839 840 return tp; 841 } 842 843 int 844 plcomioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct lwp *l) 845 { 846 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(dev)); 847 struct tty *tp = sc->sc_tty; 848 int error; 849 int s; 850 851 if (PLCOM_ISALIVE(sc) == 0) 852 return EIO; 853 854 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 855 if (error != EPASSTHROUGH) 856 return error; 857 858 error = ttioctl(tp, cmd, data, flag, l); 859 if (error != EPASSTHROUGH) 860 return error; 861 862 error = 0; 863 864 s = splserial(); 865 PLCOM_LOCK(sc); 866 867 switch (cmd) { 868 case TIOCSBRK: 869 plcom_break(sc, 1); 870 break; 871 872 case TIOCCBRK: 873 plcom_break(sc, 0); 874 break; 875 876 case TIOCSDTR: 877 plcom_modem(sc, 1); 878 break; 879 880 case TIOCCDTR: 881 plcom_modem(sc, 0); 882 break; 883 884 case TIOCGFLAGS: 885 *(int *)data = sc->sc_swflags; 886 break; 887 888 case TIOCSFLAGS: 889 error = kauth_authorize_generic(l->l_proc->p_cred, 890 KAUTH_GENERIC_ISSUSER, 891 &l->l_proc->p_acflag); 892 if (error) 893 break; 894 sc->sc_swflags = *(int *)data; 895 break; 896 897 case TIOCMSET: 898 case TIOCMBIS: 899 case TIOCMBIC: 900 tiocm_to_plcom(sc, cmd, *(int *)data); 901 break; 902 903 case TIOCMGET: 904 *(int *)data = plcom_to_tiocm(sc); 905 break; 906 907 case PPS_IOC_CREATE: 908 break; 909 910 case PPS_IOC_DESTROY: 911 break; 912 913 case PPS_IOC_GETPARAMS: { 914 pps_params_t *pp; 915 pp = (pps_params_t *)data; 916 *pp = sc->ppsparam; 917 break; 918 } 919 920 case PPS_IOC_SETPARAMS: { 921 pps_params_t *pp; 922 int mode; 923 pp = (pps_params_t *)data; 924 if (pp->mode & ~ppscap) { 925 error = EINVAL; 926 break; 927 } 928 sc->ppsparam = *pp; 929 /* 930 * Compute msr masks from user-specified timestamp state. 931 */ 932 mode = sc->ppsparam.mode; 933 #ifdef PPS_SYNC 934 if (mode & PPS_HARDPPSONASSERT) { 935 mode |= PPS_CAPTUREASSERT; 936 /* XXX revoke any previous HARDPPS source */ 937 } 938 if (mode & PPS_HARDPPSONCLEAR) { 939 mode |= PPS_CAPTURECLEAR; 940 /* XXX revoke any previous HARDPPS source */ 941 } 942 #endif /* PPS_SYNC */ 943 switch (mode & PPS_CAPTUREBOTH) { 944 case 0: 945 sc->sc_ppsmask = 0; 946 break; 947 948 case PPS_CAPTUREASSERT: 949 sc->sc_ppsmask = MSR_DCD; 950 sc->sc_ppsassert = MSR_DCD; 951 sc->sc_ppsclear = -1; 952 break; 953 954 case PPS_CAPTURECLEAR: 955 sc->sc_ppsmask = MSR_DCD; 956 sc->sc_ppsassert = -1; 957 sc->sc_ppsclear = 0; 958 break; 959 960 case PPS_CAPTUREBOTH: 961 sc->sc_ppsmask = MSR_DCD; 962 sc->sc_ppsassert = MSR_DCD; 963 sc->sc_ppsclear = 0; 964 break; 965 966 default: 967 error = EINVAL; 968 break; 969 } 970 break; 971 } 972 973 case PPS_IOC_GETCAP: 974 *(int*)data = ppscap; 975 break; 976 977 case PPS_IOC_FETCH: { 978 pps_info_t *pi; 979 pi = (pps_info_t *)data; 980 *pi = sc->ppsinfo; 981 break; 982 } 983 984 case TIOCDCDTIMESTAMP: /* XXX old, overloaded API used by xntpd v3 */ 985 /* 986 * Some GPS clocks models use the falling rather than 987 * rising edge as the on-the-second signal. 988 * The old API has no way to specify PPS polarity. 989 */ 990 sc->sc_ppsmask = MSR_DCD; 991 #ifndef PPS_TRAILING_EDGE 992 sc->sc_ppsassert = MSR_DCD; 993 sc->sc_ppsclear = -1; 994 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 995 &sc->ppsinfo.assert_timestamp); 996 #else 997 sc->sc_ppsassert = -1 998 sc->sc_ppsclear = 0; 999 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 1000 &sc->ppsinfo.clear_timestamp); 1001 #endif 1002 break; 1003 1004 default: 1005 error = EPASSTHROUGH; 1006 break; 1007 } 1008 1009 PLCOM_UNLOCK(sc); 1010 splx(s); 1011 1012 #ifdef PLCOM_DEBUG 1013 if (plcom_debug) 1014 plcomstatus(sc, "plcomioctl "); 1015 #endif 1016 1017 return error; 1018 } 1019 1020 integrate void 1021 plcom_schedrx(struct plcom_softc *sc) 1022 { 1023 1024 sc->sc_rx_ready = 1; 1025 1026 /* Wake up the poller. */ 1027 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 1028 softintr_schedule(sc->sc_si); 1029 #else 1030 #ifndef __NO_SOFT_SERIAL_INTERRUPT 1031 setsoftserial(); 1032 #else 1033 if (!plcom_softintr_scheduled) { 1034 plcom_softintr_scheduled = 1; 1035 callout_reset(&plcomsoft_callout, 1, plcomsoft, NULL); 1036 } 1037 #endif 1038 #endif 1039 } 1040 1041 void 1042 plcom_break(struct plcom_softc *sc, int onoff) 1043 { 1044 1045 if (onoff) 1046 SET(sc->sc_lcr, LCR_BRK); 1047 else 1048 CLR(sc->sc_lcr, LCR_BRK); 1049 1050 if (!sc->sc_heldchange) { 1051 if (sc->sc_tx_busy) { 1052 sc->sc_heldtbc = sc->sc_tbc; 1053 sc->sc_tbc = 0; 1054 sc->sc_heldchange = 1; 1055 } else 1056 plcom_loadchannelregs(sc); 1057 } 1058 } 1059 1060 void 1061 plcom_modem(struct plcom_softc *sc, int onoff) 1062 { 1063 1064 if (sc->sc_mcr_dtr == 0) 1065 return; 1066 1067 if (onoff) 1068 SET(sc->sc_mcr, sc->sc_mcr_dtr); 1069 else 1070 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 1071 1072 if (!sc->sc_heldchange) { 1073 if (sc->sc_tx_busy) { 1074 sc->sc_heldtbc = sc->sc_tbc; 1075 sc->sc_tbc = 0; 1076 sc->sc_heldchange = 1; 1077 } else 1078 plcom_loadchannelregs(sc); 1079 } 1080 } 1081 1082 void 1083 tiocm_to_plcom(struct plcom_softc *sc, u_long how, int ttybits) 1084 { 1085 u_char plcombits; 1086 1087 plcombits = 0; 1088 if (ISSET(ttybits, TIOCM_DTR)) 1089 SET(plcombits, MCR_DTR); 1090 if (ISSET(ttybits, TIOCM_RTS)) 1091 SET(plcombits, MCR_RTS); 1092 1093 switch (how) { 1094 case TIOCMBIC: 1095 CLR(sc->sc_mcr, plcombits); 1096 break; 1097 1098 case TIOCMBIS: 1099 SET(sc->sc_mcr, plcombits); 1100 break; 1101 1102 case TIOCMSET: 1103 CLR(sc->sc_mcr, MCR_DTR | MCR_RTS); 1104 SET(sc->sc_mcr, plcombits); 1105 break; 1106 } 1107 1108 if (!sc->sc_heldchange) { 1109 if (sc->sc_tx_busy) { 1110 sc->sc_heldtbc = sc->sc_tbc; 1111 sc->sc_tbc = 0; 1112 sc->sc_heldchange = 1; 1113 } else 1114 plcom_loadchannelregs(sc); 1115 } 1116 } 1117 1118 int 1119 plcom_to_tiocm(struct plcom_softc *sc) 1120 { 1121 u_char plcombits; 1122 int ttybits = 0; 1123 1124 plcombits = sc->sc_mcr; 1125 if (ISSET(plcombits, MCR_DTR)) 1126 SET(ttybits, TIOCM_DTR); 1127 if (ISSET(plcombits, MCR_RTS)) 1128 SET(ttybits, TIOCM_RTS); 1129 1130 plcombits = sc->sc_msr; 1131 if (ISSET(plcombits, MSR_DCD)) 1132 SET(ttybits, TIOCM_CD); 1133 if (ISSET(plcombits, MSR_CTS)) 1134 SET(ttybits, TIOCM_CTS); 1135 if (ISSET(plcombits, MSR_DSR)) 1136 SET(ttybits, TIOCM_DSR); 1137 1138 if (sc->sc_cr != 0) 1139 SET(ttybits, TIOCM_LE); 1140 1141 return ttybits; 1142 } 1143 1144 static u_char 1145 cflag2lcr(tcflag_t cflag) 1146 { 1147 u_char lcr = 0; 1148 1149 switch (ISSET(cflag, CSIZE)) { 1150 case CS5: 1151 SET(lcr, LCR_5BITS); 1152 break; 1153 case CS6: 1154 SET(lcr, LCR_6BITS); 1155 break; 1156 case CS7: 1157 SET(lcr, LCR_7BITS); 1158 break; 1159 case CS8: 1160 SET(lcr, LCR_8BITS); 1161 break; 1162 } 1163 if (ISSET(cflag, PARENB)) { 1164 SET(lcr, LCR_PEN); 1165 if (!ISSET(cflag, PARODD)) 1166 SET(lcr, LCR_EPS); 1167 } 1168 if (ISSET(cflag, CSTOPB)) 1169 SET(lcr, LCR_STP2); 1170 1171 return lcr; 1172 } 1173 1174 int 1175 plcomparam(struct tty *tp, struct termios *t) 1176 { 1177 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(tp->t_dev)); 1178 int ospeed; 1179 u_char lcr; 1180 int s; 1181 1182 if (PLCOM_ISALIVE(sc) == 0) 1183 return EIO; 1184 1185 ospeed = plcomspeed(t->c_ospeed, sc->sc_frequency); 1186 1187 /* Check requested parameters. */ 1188 if (ospeed < 0) 1189 return EINVAL; 1190 if (t->c_ispeed && t->c_ispeed != t->c_ospeed) 1191 return EINVAL; 1192 1193 /* 1194 * For the console, always force CLOCAL and !HUPCL, so that the port 1195 * is always active. 1196 */ 1197 if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) || 1198 ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE)) { 1199 SET(t->c_cflag, CLOCAL); 1200 CLR(t->c_cflag, HUPCL); 1201 } 1202 1203 /* 1204 * If there were no changes, don't do anything. This avoids dropping 1205 * input and improves performance when all we did was frob things like 1206 * VMIN and VTIME. 1207 */ 1208 if (tp->t_ospeed == t->c_ospeed && 1209 tp->t_cflag == t->c_cflag) 1210 return 0; 1211 1212 lcr = ISSET(sc->sc_lcr, LCR_BRK) | cflag2lcr(t->c_cflag); 1213 1214 s = splserial(); 1215 PLCOM_LOCK(sc); 1216 1217 sc->sc_lcr = lcr; 1218 1219 /* 1220 * PL010 has a fixed-length FIFO trigger point. 1221 */ 1222 if (ISSET(sc->sc_hwflags, PLCOM_HW_FIFO)) 1223 sc->sc_fifo = 1; 1224 else 1225 sc->sc_fifo = 0; 1226 1227 if (sc->sc_fifo) 1228 SET(sc->sc_lcr, LCR_FEN); 1229 1230 /* 1231 * If we're not in a mode that assumes a connection is present, then 1232 * ignore carrier changes. 1233 */ 1234 if (ISSET(t->c_cflag, CLOCAL | MDMBUF)) 1235 sc->sc_msr_dcd = 0; 1236 else 1237 sc->sc_msr_dcd = MSR_DCD; 1238 /* 1239 * Set the flow control pins depending on the current flow control 1240 * mode. 1241 */ 1242 if (ISSET(t->c_cflag, CRTSCTS)) { 1243 sc->sc_mcr_dtr = MCR_DTR; 1244 sc->sc_mcr_rts = MCR_RTS; 1245 sc->sc_msr_cts = MSR_CTS; 1246 } else if (ISSET(t->c_cflag, MDMBUF)) { 1247 /* 1248 * For DTR/DCD flow control, make sure we don't toggle DTR for 1249 * carrier detection. 1250 */ 1251 sc->sc_mcr_dtr = 0; 1252 sc->sc_mcr_rts = MCR_DTR; 1253 sc->sc_msr_cts = MSR_DCD; 1254 } else { 1255 /* 1256 * If no flow control, then always set RTS. This will make 1257 * the other side happy if it mistakenly thinks we're doing 1258 * RTS/CTS flow control. 1259 */ 1260 sc->sc_mcr_dtr = MCR_DTR | MCR_RTS; 1261 sc->sc_mcr_rts = 0; 1262 sc->sc_msr_cts = 0; 1263 if (ISSET(sc->sc_mcr, MCR_DTR)) 1264 SET(sc->sc_mcr, MCR_RTS); 1265 else 1266 CLR(sc->sc_mcr, MCR_RTS); 1267 } 1268 sc->sc_msr_mask = sc->sc_msr_cts | sc->sc_msr_dcd; 1269 1270 #if 0 1271 if (ospeed == 0) 1272 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 1273 else 1274 SET(sc->sc_mcr, sc->sc_mcr_dtr); 1275 #endif 1276 1277 sc->sc_dlbl = ospeed; 1278 sc->sc_dlbh = ospeed >> 8; 1279 1280 /* And copy to tty. */ 1281 tp->t_ispeed = 0; 1282 tp->t_ospeed = t->c_ospeed; 1283 tp->t_cflag = t->c_cflag; 1284 1285 if (!sc->sc_heldchange) { 1286 if (sc->sc_tx_busy) { 1287 sc->sc_heldtbc = sc->sc_tbc; 1288 sc->sc_tbc = 0; 1289 sc->sc_heldchange = 1; 1290 } else 1291 plcom_loadchannelregs(sc); 1292 } 1293 1294 if (!ISSET(t->c_cflag, CHWFLOW)) { 1295 /* Disable the high water mark. */ 1296 sc->sc_r_hiwat = 0; 1297 sc->sc_r_lowat = 0; 1298 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1299 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1300 plcom_schedrx(sc); 1301 } 1302 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 1303 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 1304 plcom_hwiflow(sc); 1305 } 1306 } else { 1307 sc->sc_r_hiwat = plcom_rbuf_hiwat; 1308 sc->sc_r_lowat = plcom_rbuf_lowat; 1309 } 1310 1311 PLCOM_UNLOCK(sc); 1312 splx(s); 1313 1314 /* 1315 * Update the tty layer's idea of the carrier bit, in case we changed 1316 * CLOCAL or MDMBUF. We don't hang up here; we only do that by 1317 * explicit request. 1318 */ 1319 (void) (*tp->t_linesw->l_modem)(tp, ISSET(sc->sc_msr, MSR_DCD)); 1320 1321 #ifdef PLCOM_DEBUG 1322 if (plcom_debug) 1323 plcomstatus(sc, "plcomparam "); 1324 #endif 1325 1326 if (!ISSET(t->c_cflag, CHWFLOW)) { 1327 if (sc->sc_tx_stopped) { 1328 sc->sc_tx_stopped = 0; 1329 plcomstart(tp); 1330 } 1331 } 1332 1333 return 0; 1334 } 1335 1336 void 1337 plcom_iflush(struct plcom_softc *sc) 1338 { 1339 bus_space_tag_t iot = sc->sc_iot; 1340 bus_space_handle_t ioh = sc->sc_ioh; 1341 #ifdef DIAGNOSTIC 1342 int reg; 1343 #endif 1344 int timo; 1345 1346 #ifdef DIAGNOSTIC 1347 reg = 0xffff; 1348 #endif 1349 timo = 50000; 1350 /* flush any pending I/O */ 1351 while (! ISSET(bus_space_read_1(iot, ioh, plcom_fr), FR_RXFE) 1352 && --timo) 1353 #ifdef DIAGNOSTIC 1354 reg = 1355 #else 1356 (void) 1357 #endif 1358 bus_space_read_1(iot, ioh, plcom_dr); 1359 #ifdef DIAGNOSTIC 1360 if (!timo) 1361 printf("%s: plcom_iflush timeout %02x\n", sc->sc_dev.dv_xname, 1362 reg); 1363 #endif 1364 } 1365 1366 void 1367 plcom_loadchannelregs(struct plcom_softc *sc) 1368 { 1369 bus_space_tag_t iot = sc->sc_iot; 1370 bus_space_handle_t ioh = sc->sc_ioh; 1371 1372 /* XXXXX necessary? */ 1373 plcom_iflush(sc); 1374 1375 bus_space_write_1(iot, ioh, plcom_cr, 0); 1376 1377 bus_space_write_1(iot, ioh, plcom_dlbl, sc->sc_dlbl); 1378 bus_space_write_1(iot, ioh, plcom_dlbh, sc->sc_dlbh); 1379 bus_space_write_1(iot, ioh, plcom_lcr, sc->sc_lcr); 1380 /* XXX device_unit() abuse */ 1381 sc->sc_set_mcr(sc->sc_set_mcr_arg, device_unit(&sc->sc_dev), 1382 sc->sc_mcr_active = sc->sc_mcr); 1383 1384 bus_space_write_1(iot, ioh, plcom_cr, sc->sc_cr); 1385 } 1386 1387 int 1388 plcomhwiflow(struct tty *tp, int block) 1389 { 1390 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(tp->t_dev)); 1391 int s; 1392 1393 if (PLCOM_ISALIVE(sc) == 0) 1394 return 0; 1395 1396 if (sc->sc_mcr_rts == 0) 1397 return 0; 1398 1399 s = splserial(); 1400 PLCOM_LOCK(sc); 1401 1402 if (block) { 1403 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1404 SET(sc->sc_rx_flags, RX_TTY_BLOCKED); 1405 plcom_hwiflow(sc); 1406 } 1407 } else { 1408 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1409 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1410 plcom_schedrx(sc); 1411 } 1412 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1413 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED); 1414 plcom_hwiflow(sc); 1415 } 1416 } 1417 1418 PLCOM_UNLOCK(sc); 1419 splx(s); 1420 return 1; 1421 } 1422 1423 /* 1424 * (un)block input via hw flowcontrol 1425 */ 1426 void 1427 plcom_hwiflow(struct plcom_softc *sc) 1428 { 1429 if (sc->sc_mcr_rts == 0) 1430 return; 1431 1432 if (ISSET(sc->sc_rx_flags, RX_ANY_BLOCK)) { 1433 CLR(sc->sc_mcr, sc->sc_mcr_rts); 1434 CLR(sc->sc_mcr_active, sc->sc_mcr_rts); 1435 } else { 1436 SET(sc->sc_mcr, sc->sc_mcr_rts); 1437 SET(sc->sc_mcr_active, sc->sc_mcr_rts); 1438 } 1439 /* XXX device_unit() abuse */ 1440 sc->sc_set_mcr(sc->sc_set_mcr_arg, device_unit(&sc->sc_dev), 1441 sc->sc_mcr_active); 1442 } 1443 1444 1445 void 1446 plcomstart(struct tty *tp) 1447 { 1448 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(tp->t_dev)); 1449 bus_space_tag_t iot = sc->sc_iot; 1450 bus_space_handle_t ioh = sc->sc_ioh; 1451 int s; 1452 1453 if (PLCOM_ISALIVE(sc) == 0) 1454 return; 1455 1456 s = spltty(); 1457 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 1458 goto out; 1459 if (sc->sc_tx_stopped) 1460 goto out; 1461 1462 if (tp->t_outq.c_cc <= tp->t_lowat) { 1463 if (ISSET(tp->t_state, TS_ASLEEP)) { 1464 CLR(tp->t_state, TS_ASLEEP); 1465 wakeup(&tp->t_outq); 1466 } 1467 selwakeup(&tp->t_wsel); 1468 if (tp->t_outq.c_cc == 0) 1469 goto out; 1470 } 1471 1472 /* Grab the first contiguous region of buffer space. */ 1473 { 1474 u_char *tba; 1475 int tbc; 1476 1477 tba = tp->t_outq.c_cf; 1478 tbc = ndqb(&tp->t_outq, 0); 1479 1480 (void)splserial(); 1481 PLCOM_LOCK(sc); 1482 1483 sc->sc_tba = tba; 1484 sc->sc_tbc = tbc; 1485 } 1486 1487 SET(tp->t_state, TS_BUSY); 1488 sc->sc_tx_busy = 1; 1489 1490 /* Enable transmit completion interrupts if necessary. */ 1491 if (!ISSET(sc->sc_cr, CR_TIE)) { 1492 SET(sc->sc_cr, CR_TIE); 1493 bus_space_write_1(iot, ioh, plcom_cr, sc->sc_cr); 1494 } 1495 1496 /* Output the first chunk of the contiguous buffer. */ 1497 { 1498 int n; 1499 1500 n = sc->sc_tbc; 1501 if (n > sc->sc_fifolen) 1502 n = sc->sc_fifolen; 1503 bus_space_write_multi_1(iot, ioh, plcom_dr, sc->sc_tba, n); 1504 sc->sc_tbc -= n; 1505 sc->sc_tba += n; 1506 } 1507 PLCOM_UNLOCK(sc); 1508 out: 1509 splx(s); 1510 return; 1511 } 1512 1513 /* 1514 * Stop output on a line. 1515 */ 1516 void 1517 plcomstop(struct tty *tp, int flag) 1518 { 1519 struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(tp->t_dev)); 1520 int s; 1521 1522 s = splserial(); 1523 PLCOM_LOCK(sc); 1524 if (ISSET(tp->t_state, TS_BUSY)) { 1525 /* Stop transmitting at the next chunk. */ 1526 sc->sc_tbc = 0; 1527 sc->sc_heldtbc = 0; 1528 if (!ISSET(tp->t_state, TS_TTSTOP)) 1529 SET(tp->t_state, TS_FLUSH); 1530 } 1531 PLCOM_UNLOCK(sc); 1532 splx(s); 1533 } 1534 1535 void 1536 plcomdiag(void *arg) 1537 { 1538 struct plcom_softc *sc = arg; 1539 int overflows, floods; 1540 int s; 1541 1542 s = splserial(); 1543 PLCOM_LOCK(sc); 1544 overflows = sc->sc_overflows; 1545 sc->sc_overflows = 0; 1546 floods = sc->sc_floods; 1547 sc->sc_floods = 0; 1548 sc->sc_errors = 0; 1549 PLCOM_UNLOCK(sc); 1550 splx(s); 1551 1552 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1553 sc->sc_dev.dv_xname, 1554 overflows, overflows == 1 ? "" : "s", 1555 floods, floods == 1 ? "" : "s"); 1556 } 1557 1558 integrate void 1559 plcom_rxsoft(struct plcom_softc *sc, struct tty *tp) 1560 { 1561 int (*rint) (int, struct tty *) = tp->t_linesw->l_rint; 1562 u_char *get, *end; 1563 u_int cc, scc; 1564 u_char rsr; 1565 int code; 1566 int s; 1567 1568 end = sc->sc_ebuf; 1569 get = sc->sc_rbget; 1570 scc = cc = plcom_rbuf_size - sc->sc_rbavail; 1571 1572 if (cc == plcom_rbuf_size) { 1573 sc->sc_floods++; 1574 if (sc->sc_errors++ == 0) 1575 callout_reset(&sc->sc_diag_callout, 60 * hz, 1576 plcomdiag, sc); 1577 } 1578 1579 while (cc) { 1580 code = get[0]; 1581 rsr = get[1]; 1582 if (ISSET(rsr, RSR_OE | RSR_BE | RSR_FE | RSR_PE)) { 1583 if (ISSET(rsr, RSR_OE)) { 1584 sc->sc_overflows++; 1585 if (sc->sc_errors++ == 0) 1586 callout_reset(&sc->sc_diag_callout, 1587 60 * hz, plcomdiag, sc); 1588 } 1589 if (ISSET(rsr, RSR_BE | RSR_FE)) 1590 SET(code, TTY_FE); 1591 if (ISSET(rsr, RSR_PE)) 1592 SET(code, TTY_PE); 1593 } 1594 if ((*rint)(code, tp) == -1) { 1595 /* 1596 * The line discipline's buffer is out of space. 1597 */ 1598 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1599 /* 1600 * We're either not using flow control, or the 1601 * line discipline didn't tell us to block for 1602 * some reason. Either way, we have no way to 1603 * know when there's more space available, so 1604 * just drop the rest of the data. 1605 */ 1606 get += cc << 1; 1607 if (get >= end) 1608 get -= plcom_rbuf_size << 1; 1609 cc = 0; 1610 } else { 1611 /* 1612 * Don't schedule any more receive processing 1613 * until the line discipline tells us there's 1614 * space available (through plcomhwiflow()). 1615 * Leave the rest of the data in the input 1616 * buffer. 1617 */ 1618 SET(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1619 } 1620 break; 1621 } 1622 get += 2; 1623 if (get >= end) 1624 get = sc->sc_rbuf; 1625 cc--; 1626 } 1627 1628 if (cc != scc) { 1629 sc->sc_rbget = get; 1630 s = splserial(); 1631 PLCOM_LOCK(sc); 1632 1633 cc = sc->sc_rbavail += scc - cc; 1634 /* Buffers should be ok again, release possible block. */ 1635 if (cc >= sc->sc_r_lowat) { 1636 if (ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1637 CLR(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1638 SET(sc->sc_cr, CR_RIE | CR_RTIE); 1639 bus_space_write_1(sc->sc_iot, sc->sc_ioh, plcom_cr, sc->sc_cr); 1640 } 1641 if (ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED)) { 1642 CLR(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1643 plcom_hwiflow(sc); 1644 } 1645 } 1646 PLCOM_UNLOCK(sc); 1647 splx(s); 1648 } 1649 } 1650 1651 integrate void 1652 plcom_txsoft(struct plcom_softc *sc, struct tty *tp) 1653 { 1654 1655 CLR(tp->t_state, TS_BUSY); 1656 if (ISSET(tp->t_state, TS_FLUSH)) 1657 CLR(tp->t_state, TS_FLUSH); 1658 else 1659 ndflush(&tp->t_outq, (int)(sc->sc_tba - tp->t_outq.c_cf)); 1660 (*tp->t_linesw->l_start)(tp); 1661 } 1662 1663 integrate void 1664 plcom_stsoft(struct plcom_softc *sc, struct tty *tp) 1665 { 1666 u_char msr, delta; 1667 int s; 1668 1669 s = splserial(); 1670 PLCOM_LOCK(sc); 1671 msr = sc->sc_msr; 1672 delta = sc->sc_msr_delta; 1673 sc->sc_msr_delta = 0; 1674 PLCOM_UNLOCK(sc); 1675 splx(s); 1676 1677 if (ISSET(delta, sc->sc_msr_dcd)) { 1678 /* 1679 * Inform the tty layer that carrier detect changed. 1680 */ 1681 (void) (*tp->t_linesw->l_modem)(tp, ISSET(msr, MSR_DCD)); 1682 } 1683 1684 if (ISSET(delta, sc->sc_msr_cts)) { 1685 /* Block or unblock output according to flow control. */ 1686 if (ISSET(msr, sc->sc_msr_cts)) { 1687 sc->sc_tx_stopped = 0; 1688 (*tp->t_linesw->l_start)(tp); 1689 } else { 1690 sc->sc_tx_stopped = 1; 1691 } 1692 } 1693 1694 #ifdef PLCOM_DEBUG 1695 if (plcom_debug) 1696 plcomstatus(sc, "plcom_stsoft"); 1697 #endif 1698 } 1699 1700 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 1701 void 1702 plcomsoft(void *arg) 1703 { 1704 struct plcom_softc *sc = arg; 1705 struct tty *tp; 1706 1707 if (PLCOM_ISALIVE(sc) == 0) 1708 return; 1709 1710 { 1711 #else 1712 void 1713 #ifndef __NO_SOFT_SERIAL_INTERRUPT 1714 plcomsoft(void) 1715 #else 1716 plcomsoft(void *arg) 1717 #endif 1718 { 1719 struct plcom_softc *sc; 1720 struct tty *tp; 1721 int unit; 1722 #ifdef __NO_SOFT_SERIAL_INTERRUPT 1723 int s; 1724 1725 s = splsoftserial(); 1726 plcom_softintr_scheduled = 0; 1727 #endif 1728 1729 for (unit = 0; unit < plcom_cd.cd_ndevs; unit++) { 1730 sc = device_lookup(&plcom_cd, unit); 1731 if (sc == NULL || !ISSET(sc->sc_hwflags, PLCOM_HW_DEV_OK)) 1732 continue; 1733 1734 if (PLCOM_ISALIVE(sc) == 0) 1735 continue; 1736 1737 tp = sc->sc_tty; 1738 if (tp == NULL) 1739 continue; 1740 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) 1741 continue; 1742 #endif 1743 tp = sc->sc_tty; 1744 1745 if (sc->sc_rx_ready) { 1746 sc->sc_rx_ready = 0; 1747 plcom_rxsoft(sc, tp); 1748 } 1749 1750 if (sc->sc_st_check) { 1751 sc->sc_st_check = 0; 1752 plcom_stsoft(sc, tp); 1753 } 1754 1755 if (sc->sc_tx_done) { 1756 sc->sc_tx_done = 0; 1757 plcom_txsoft(sc, tp); 1758 } 1759 } 1760 1761 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS 1762 #ifdef __NO_SOFT_SERIAL_INTERRUPT 1763 splx(s); 1764 #endif 1765 #endif 1766 } 1767 1768 #ifdef __ALIGN_BRACKET_LEVEL_FOR_CTAGS 1769 /* there has got to be a better way to do plcomsoft() */ 1770 }} 1771 #endif 1772 1773 int 1774 plcomintr(void *arg) 1775 { 1776 struct plcom_softc *sc = arg; 1777 bus_space_tag_t iot = sc->sc_iot; 1778 bus_space_handle_t ioh = sc->sc_ioh; 1779 u_char *put, *end; 1780 u_int cc; 1781 u_char rsr, iir; 1782 1783 if (PLCOM_ISALIVE(sc) == 0) 1784 return 0; 1785 1786 PLCOM_LOCK(sc); 1787 iir = bus_space_read_1(iot, ioh, plcom_iir); 1788 if (! ISSET(iir, IIR_IMASK)) { 1789 PLCOM_UNLOCK(sc); 1790 return 0; 1791 } 1792 1793 end = sc->sc_ebuf; 1794 put = sc->sc_rbput; 1795 cc = sc->sc_rbavail; 1796 1797 do { 1798 u_char msr, delta, fr; 1799 1800 fr = bus_space_read_1(iot, ioh, plcom_fr); 1801 1802 if (!ISSET(fr, FR_RXFE) && 1803 !ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1804 while (cc > 0) { 1805 int cn_trapped = 0; 1806 put[0] = bus_space_read_1(iot, ioh, 1807 plcom_dr); 1808 rsr = bus_space_read_1(iot, ioh, plcom_rsr); 1809 /* Clear any error status. */ 1810 if (ISSET(rsr, 1811 (RSR_BE | RSR_OE | RSR_PE | RSR_FE))) 1812 bus_space_write_1(iot, ioh, plcom_ecr, 1813 0); 1814 if (ISSET(rsr, RSR_BE)) { 1815 cn_trapped = 0; 1816 cn_check_magic(sc->sc_tty->t_dev, 1817 CNC_BREAK, plcom_cnm_state); 1818 if (cn_trapped) 1819 continue; 1820 #if defined(KGDB) 1821 if (ISSET(sc->sc_hwflags, 1822 PLCOM_HW_KGDB)) { 1823 kgdb_connect(1); 1824 continue; 1825 } 1826 #endif 1827 } 1828 1829 put[1] = rsr; 1830 cn_trapped = 0; 1831 cn_check_magic(sc->sc_tty->t_dev, 1832 put[0], plcom_cnm_state); 1833 if (cn_trapped) { 1834 fr = bus_space_read_1(iot, ioh, 1835 plcom_fr); 1836 if (ISSET(fr, FR_RXFE)) 1837 break; 1838 1839 continue; 1840 } 1841 put += 2; 1842 if (put >= end) 1843 put = sc->sc_rbuf; 1844 cc--; 1845 1846 fr = bus_space_read_1(iot, ioh, plcom_fr); 1847 if (ISSET(fr, FR_RXFE)) 1848 break; 1849 } 1850 1851 /* 1852 * Current string of incoming characters ended because 1853 * no more data was available or we ran out of space. 1854 * Schedule a receive event if any data was received. 1855 * If we're out of space, turn off receive interrupts. 1856 */ 1857 sc->sc_rbput = put; 1858 sc->sc_rbavail = cc; 1859 if (!ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) 1860 sc->sc_rx_ready = 1; 1861 1862 /* 1863 * See if we are in danger of overflowing a buffer. If 1864 * so, use hardware flow control to ease the pressure. 1865 */ 1866 if (!ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED) && 1867 cc < sc->sc_r_hiwat) { 1868 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1869 plcom_hwiflow(sc); 1870 } 1871 1872 /* 1873 * If we're out of space, disable receive interrupts 1874 * until the queue has drained a bit. 1875 */ 1876 if (!cc) { 1877 SET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1878 CLR(sc->sc_cr, CR_RIE | CR_RTIE); 1879 bus_space_write_1(iot, ioh, plcom_cr, 1880 sc->sc_cr); 1881 } 1882 } else { 1883 if (ISSET(iir, IIR_RIS)) { 1884 bus_space_write_1(iot, ioh, plcom_cr, 0); 1885 delay(10); 1886 bus_space_write_1(iot, ioh, plcom_cr, 1887 sc->sc_cr); 1888 continue; 1889 } 1890 } 1891 1892 msr = bus_space_read_1(iot, ioh, plcom_fr); 1893 delta = msr ^ sc->sc_msr; 1894 sc->sc_msr = msr; 1895 /* Clear any pending modem status interrupt. */ 1896 if (iir & IIR_MIS) 1897 bus_space_write_1(iot, ioh, plcom_icr, 0); 1898 /* 1899 * Pulse-per-second (PSS) signals on edge of DCD? 1900 * Process these even if line discipline is ignoring DCD. 1901 */ 1902 if (delta & sc->sc_ppsmask) { 1903 struct timeval tv; 1904 if ((msr & sc->sc_ppsmask) == sc->sc_ppsassert) { 1905 /* XXX nanotime() */ 1906 microtime(&tv); 1907 TIMEVAL_TO_TIMESPEC(&tv, 1908 &sc->ppsinfo.assert_timestamp); 1909 if (sc->ppsparam.mode & PPS_OFFSETASSERT) { 1910 timespecadd(&sc->ppsinfo.assert_timestamp, 1911 &sc->ppsparam.assert_offset, 1912 &sc->ppsinfo.assert_timestamp); 1913 } 1914 1915 #ifdef PPS_SYNC 1916 if (sc->ppsparam.mode & PPS_HARDPPSONASSERT) 1917 hardpps(&tv, tv.tv_usec); 1918 #endif 1919 sc->ppsinfo.assert_sequence++; 1920 sc->ppsinfo.current_mode = sc->ppsparam.mode; 1921 1922 } else if ((msr & sc->sc_ppsmask) == sc->sc_ppsclear) { 1923 /* XXX nanotime() */ 1924 microtime(&tv); 1925 TIMEVAL_TO_TIMESPEC(&tv, 1926 &sc->ppsinfo.clear_timestamp); 1927 if (sc->ppsparam.mode & PPS_OFFSETCLEAR) { 1928 timespecadd(&sc->ppsinfo.clear_timestamp, 1929 &sc->ppsparam.clear_offset, 1930 &sc->ppsinfo.clear_timestamp); 1931 } 1932 1933 #ifdef PPS_SYNC 1934 if (sc->ppsparam.mode & PPS_HARDPPSONCLEAR) 1935 hardpps(&tv, tv.tv_usec); 1936 #endif 1937 sc->ppsinfo.clear_sequence++; 1938 sc->ppsinfo.current_mode = sc->ppsparam.mode; 1939 } 1940 } 1941 1942 /* 1943 * Process normal status changes 1944 */ 1945 if (ISSET(delta, sc->sc_msr_mask)) { 1946 SET(sc->sc_msr_delta, delta); 1947 1948 /* 1949 * Stop output immediately if we lose the output 1950 * flow control signal or carrier detect. 1951 */ 1952 if (ISSET(~msr, sc->sc_msr_mask)) { 1953 sc->sc_tbc = 0; 1954 sc->sc_heldtbc = 0; 1955 #ifdef PLCOM_DEBUG 1956 if (plcom_debug) 1957 plcomstatus(sc, "plcomintr "); 1958 #endif 1959 } 1960 1961 sc->sc_st_check = 1; 1962 } 1963 1964 /* 1965 * Done handling any receive interrupts. See if data 1966 * can be * transmitted as well. Schedule tx done 1967 * event if no data left * and tty was marked busy. 1968 */ 1969 if (ISSET(iir, IIR_TIS)) { 1970 /* 1971 * If we've delayed a parameter change, do it 1972 * now, and restart * output. 1973 */ 1974 if (sc->sc_heldchange) { 1975 plcom_loadchannelregs(sc); 1976 sc->sc_heldchange = 0; 1977 sc->sc_tbc = sc->sc_heldtbc; 1978 sc->sc_heldtbc = 0; 1979 } 1980 1981 /* 1982 * Output the next chunk of the contiguous 1983 * buffer, if any. 1984 */ 1985 if (sc->sc_tbc > 0) { 1986 int n; 1987 1988 n = sc->sc_tbc; 1989 if (n > sc->sc_fifolen) 1990 n = sc->sc_fifolen; 1991 bus_space_write_multi_1(iot, ioh, plcom_dr, 1992 sc->sc_tba, n); 1993 sc->sc_tbc -= n; 1994 sc->sc_tba += n; 1995 } else { 1996 /* 1997 * Disable transmit plcompletion 1998 * interrupts if necessary. 1999 */ 2000 if (ISSET(sc->sc_cr, CR_TIE)) { 2001 CLR(sc->sc_cr, CR_TIE); 2002 bus_space_write_1(iot, ioh, plcom_cr, 2003 sc->sc_cr); 2004 } 2005 if (sc->sc_tx_busy) { 2006 sc->sc_tx_busy = 0; 2007 sc->sc_tx_done = 1; 2008 } 2009 } 2010 } 2011 } while (ISSET((iir = bus_space_read_1(iot, ioh, plcom_iir)), 2012 IIR_IMASK)); 2013 2014 PLCOM_UNLOCK(sc); 2015 2016 /* Wake up the poller. */ 2017 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 2018 softintr_schedule(sc->sc_si); 2019 #else 2020 #ifndef __NO_SOFT_SERIAL_INTERRUPT 2021 setsoftserial(); 2022 #else 2023 if (!plcom_softintr_scheduled) { 2024 plcom_softintr_scheduled = 1; 2025 callout_reset(&plcomsoft_callout, 1, plcomsoft, NULL); 2026 } 2027 #endif 2028 #endif 2029 2030 #if NRND > 0 && defined(RND_COM) 2031 rnd_add_uint32(&sc->rnd_source, iir | rsr); 2032 #endif 2033 2034 return 1; 2035 } 2036 2037 /* 2038 * The following functions are polled getc and putc routines, shared 2039 * by the console and kgdb glue. 2040 * 2041 * The read-ahead code is so that you can detect pending in-band 2042 * cn_magic in polled mode while doing output rather than having to 2043 * wait until the kernel decides it needs input. 2044 */ 2045 2046 #define MAX_READAHEAD 20 2047 static int plcom_readahead[MAX_READAHEAD]; 2048 static int plcom_readaheadcount = 0; 2049 2050 int 2051 plcom_common_getc(dev_t dev, bus_space_tag_t iot, bus_space_handle_t ioh) 2052 { 2053 int s = splserial(); 2054 u_char stat, c; 2055 2056 /* got a character from reading things earlier */ 2057 if (plcom_readaheadcount > 0) { 2058 int i; 2059 2060 c = plcom_readahead[0]; 2061 for (i = 1; i < plcom_readaheadcount; i++) { 2062 plcom_readahead[i-1] = plcom_readahead[i]; 2063 } 2064 plcom_readaheadcount--; 2065 splx(s); 2066 return c; 2067 } 2068 2069 /* block until a character becomes available */ 2070 while (ISSET(stat = bus_space_read_1(iot, ioh, plcom_fr), FR_RXFE)) 2071 ; 2072 2073 c = bus_space_read_1(iot, ioh, plcom_dr); 2074 stat = bus_space_read_1(iot, ioh, plcom_iir); 2075 { 2076 int cn_trapped = 0; /* unused */ 2077 #ifdef DDB 2078 extern int db_active; 2079 if (!db_active) 2080 #endif 2081 cn_check_magic(dev, c, plcom_cnm_state); 2082 } 2083 splx(s); 2084 return c; 2085 } 2086 2087 void 2088 plcom_common_putc(dev_t dev, bus_space_tag_t iot, bus_space_handle_t ioh, 2089 int c) 2090 { 2091 int s = splserial(); 2092 int timo; 2093 2094 int cin, stat; 2095 if (plcom_readaheadcount < MAX_READAHEAD 2096 && !ISSET(stat = bus_space_read_1(iot, ioh, plcom_fr), FR_RXFE)) { 2097 int cn_trapped = 0; 2098 cin = bus_space_read_1(iot, ioh, plcom_dr); 2099 stat = bus_space_read_1(iot, ioh, plcom_iir); 2100 cn_check_magic(dev, cin, plcom_cnm_state); 2101 plcom_readahead[plcom_readaheadcount++] = cin; 2102 } 2103 2104 /* wait for any pending transmission to finish */ 2105 timo = 150000; 2106 while (!ISSET(bus_space_read_1(iot, ioh, plcom_fr), FR_TXFE) && --timo) 2107 continue; 2108 2109 bus_space_write_1(iot, ioh, plcom_dr, c); 2110 PLCOM_BARRIER(iot, ioh, BR | BW); 2111 2112 /* wait for this transmission to complete */ 2113 timo = 1500000; 2114 while (!ISSET(bus_space_read_1(iot, ioh, plcom_fr), FR_TXFE) && --timo) 2115 continue; 2116 2117 splx(s); 2118 } 2119 2120 /* 2121 * Initialize UART for use as console or KGDB line. 2122 */ 2123 int 2124 plcominit(bus_space_tag_t iot, bus_addr_t iobase, int rate, int frequency, 2125 tcflag_t cflag, bus_space_handle_t *iohp) 2126 { 2127 bus_space_handle_t ioh; 2128 2129 if (bus_space_map(iot, iobase, PLCOM_UART_SIZE, 0, &ioh)) 2130 return ENOMEM; /* ??? */ 2131 2132 rate = plcomspeed(rate, frequency); 2133 bus_space_write_1(iot, ioh, plcom_cr, 0); 2134 bus_space_write_1(iot, ioh, plcom_dlbl, rate); 2135 bus_space_write_1(iot, ioh, plcom_dlbh, rate >> 8); 2136 bus_space_write_1(iot, ioh, plcom_lcr, cflag2lcr(cflag) | LCR_FEN); 2137 bus_space_write_1(iot, ioh, plcom_cr, CR_UARTEN); 2138 2139 #if 0 2140 /* Ought to do something like this, but we have no sc to 2141 dereference. */ 2142 /* XXX device_unit() abuse */ 2143 sc->sc_set_mcr(sc->sc_set_mcr_arg, device_unit(&sc->sc_dev), 2144 MCR_DTR | MCR_RTS); 2145 #endif 2146 2147 *iohp = ioh; 2148 return 0; 2149 } 2150 2151 /* 2152 * Following are all routines needed for PLCOM to act as console 2153 */ 2154 struct consdev plcomcons = { 2155 NULL, NULL, plcomcngetc, plcomcnputc, plcomcnpollc, NULL, 2156 NULL, NULL, NODEV, CN_NORMAL 2157 }; 2158 2159 2160 int 2161 plcomcnattach(bus_space_tag_t iot, bus_addr_t iobase, int rate, int frequency, 2162 tcflag_t cflag, int unit) 2163 { 2164 int res; 2165 2166 res = plcominit(iot, iobase, rate, frequency, cflag, &plcomconsioh); 2167 if (res) 2168 return res; 2169 2170 cn_tab = &plcomcons; 2171 cn_init_magic(&plcom_cnm_state); 2172 cn_set_magic("\047\001"); /* default magic is BREAK */ 2173 2174 plcomconstag = iot; 2175 plcomconsunit = unit; 2176 plcomconsrate = rate; 2177 plcomconscflag = cflag; 2178 2179 return 0; 2180 } 2181 2182 void 2183 plcomcndetach(void) 2184 { 2185 bus_space_unmap(plcomconstag, plcomconsioh, PLCOM_UART_SIZE); 2186 plcomconstag = NULL; 2187 2188 cn_tab = NULL; 2189 } 2190 2191 int 2192 plcomcngetc(dev_t dev) 2193 { 2194 return plcom_common_getc(dev, plcomconstag, plcomconsioh); 2195 } 2196 2197 /* 2198 * Console kernel output character routine. 2199 */ 2200 void 2201 plcomcnputc(dev_t dev, int c) 2202 { 2203 plcom_common_putc(dev, plcomconstag, plcomconsioh, c); 2204 } 2205 2206 void 2207 plcomcnpollc(dev_t dev, int on) 2208 { 2209 2210 } 2211 2212 #ifdef KGDB 2213 int 2214 plcom_kgdb_attach(bus_space_tag_t iot, bus_addr_t iobase, int rate, 2215 int frequency, tcflag_t cflag, int unit) 2216 { 2217 int res; 2218 2219 if (iot == plcomconstag && iobase == plcomconsunit) 2220 return EBUSY; /* cannot share with console */ 2221 2222 res = plcominit(iot, iobase, rate, frequency, cflag, &plcom_kgdb_ioh); 2223 if (res) 2224 return res; 2225 2226 kgdb_attach(plcom_kgdb_getc, plcom_kgdb_putc, NULL); 2227 kgdb_dev = 123; /* unneeded, only to satisfy some tests */ 2228 2229 plcom_kgdb_iot = iot; 2230 plcom_kgdb_unit = unit; 2231 2232 return 0; 2233 } 2234 2235 /* ARGSUSED */ 2236 int 2237 plcom_kgdb_getc(void *arg) 2238 { 2239 return plcom_common_getc(NODEV, plcom_kgdb_iot, plcom_kgdb_ioh); 2240 } 2241 2242 /* ARGSUSED */ 2243 void 2244 plcom_kgdb_putc(void *arg, int c) 2245 { 2246 plcom_common_putc(NODEV, plcom_kgdb_iot, plcom_kgdb_ioh, c); 2247 } 2248 #endif /* KGDB */ 2249 2250 /* helper function to identify the plcom ports used by 2251 console or KGDB (and not yet autoconf attached) */ 2252 int 2253 plcom_is_console(bus_space_tag_t iot, int unit, 2254 bus_space_handle_t *ioh) 2255 { 2256 bus_space_handle_t help; 2257 2258 if (!plcomconsattached && 2259 iot == plcomconstag && unit == plcomconsunit) 2260 help = plcomconsioh; 2261 #ifdef KGDB 2262 else if (!plcom_kgdb_attached && 2263 iot == plcom_kgdb_iot && unit == plcom_kgdb_unit) 2264 help = plcom_kgdb_ioh; 2265 #endif 2266 else 2267 return 0; 2268 2269 if (ioh) 2270 *ioh = help; 2271 return 1; 2272 } 2273
Indexes created Sun Oct 19 02:09:48 GMT 2025