plcom.c revision 1.32.8.3
1 /* $NetBSD: plcom.c,v 1.32.8.3 2012/06/02 11:08:55 mrg 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 * 46 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 47 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 48 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 49 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 50 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 51 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 52 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 53 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 54 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 55 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 56 * POSSIBILITY OF SUCH DAMAGE. 57 */ 58 59 /* 60 * Copyright (c) 1991 The Regents of the University of California. 61 * All rights reserved. 62 * 63 * Redistribution and use in source and binary forms, with or without 64 * modification, are permitted provided that the following conditions 65 * are met: 66 * 1. Redistributions of source code must retain the above copyright 67 * notice, this list of conditions and the following disclaimer. 68 * 2. Redistributions in binary form must reproduce the above copyright 69 * notice, this list of conditions and the following disclaimer in the 70 * documentation and/or other materials provided with the distribution. 71 * 3. Neither the name of the University nor the names of its contributors 72 * may be used to endorse or promote products derived from this software 73 * without specific prior written permission. 74 * 75 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 76 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 77 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 78 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 79 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 80 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 81 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 82 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 83 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 84 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 85 * SUCH DAMAGE. 86 * 87 * @(#)com.c 7.5 (Berkeley) 5/16/91 88 */ 89 90 /* 91 * COM driver for the Prime Cell PL010 UART, which is similar to the 16C550, 92 * but has a completely different programmer's model. 93 * Derived from the NS16550AF com driver. 94 */ 95 96 #include <sys/cdefs.h> 97 __KERNEL_RCSID(0, "$NetBSD: plcom.c,v 1.32.8.3 2012/06/02 11:08:55 mrg Exp $"); 98 99 #include "opt_plcom.h" 100 #include "opt_ddb.h" 101 #include "opt_kgdb.h" 102 #include "opt_lockdebug.h" 103 #include "opt_multiprocessor.h" 104 105 #include "rnd.h" 106 #ifdef RND_COM 107 #include <sys/rnd.h> 108 #endif 109 110 /* 111 * Override cnmagic(9) macro before including <sys/systm.h>. 112 * We need to know if cn_check_magic triggered debugger, so set a flag. 113 * Callers of cn_check_magic must declare int cn_trapped = 0; 114 * XXX: this is *ugly*! 115 */ 116 #define cn_trap() \ 117 do { \ 118 console_debugger(); \ 119 cn_trapped = 1; \ 120 } while (/* CONSTCOND */ 0) 121 122 #include <sys/param.h> 123 #include <sys/systm.h> 124 #include <sys/ioctl.h> 125 #include <sys/select.h> 126 #include <sys/tty.h> 127 #include <sys/proc.h> 128 #include <sys/conf.h> 129 #include <sys/file.h> 130 #include <sys/uio.h> 131 #include <sys/kernel.h> 132 #include <sys/syslog.h> 133 #include <sys/types.h> 134 #include <sys/device.h> 135 #include <sys/malloc.h> 136 #include <sys/timepps.h> 137 #include <sys/vnode.h> 138 #include <sys/kauth.h> 139 #include <sys/intr.h> 140 #include <sys/bus.h> 141 142 #include <evbarm/dev/plcomreg.h> 143 #include <evbarm/dev/plcomvar.h> 144 145 #include <dev/cons.h> 146 147 static void plcom_enable_debugport (struct plcom_softc *); 148 149 void plcom_config (struct plcom_softc *); 150 void plcom_shutdown (struct plcom_softc *); 151 int plcomspeed (long, long); 152 static u_char cflag2lcr (tcflag_t); 153 int plcomparam (struct tty *, struct termios *); 154 void plcomstart (struct tty *); 155 int plcomhwiflow (struct tty *, int); 156 157 void plcom_loadchannelregs (struct plcom_softc *); 158 void plcom_hwiflow (struct plcom_softc *); 159 void plcom_break (struct plcom_softc *, int); 160 void plcom_modem (struct plcom_softc *, int); 161 void tiocm_to_plcom (struct plcom_softc *, u_long, int); 162 int plcom_to_tiocm (struct plcom_softc *); 163 void plcom_iflush (struct plcom_softc *); 164 165 int plcom_common_getc (dev_t, bus_space_tag_t, bus_space_handle_t); 166 void plcom_common_putc (dev_t, bus_space_tag_t, bus_space_handle_t, int); 167 168 int plcominit (bus_space_tag_t, bus_addr_t, int, int, tcflag_t, 169 bus_space_handle_t *); 170 171 dev_type_open(plcomopen); 172 dev_type_close(plcomclose); 173 dev_type_read(plcomread); 174 dev_type_write(plcomwrite); 175 dev_type_ioctl(plcomioctl); 176 dev_type_stop(plcomstop); 177 dev_type_tty(plcomtty); 178 dev_type_poll(plcompoll); 179 180 int plcomcngetc (dev_t); 181 void plcomcnputc (dev_t, int); 182 void plcomcnpollc (dev_t, int); 183 184 #define integrate static inline 185 void plcomsoft (void *); 186 integrate void plcom_rxsoft (struct plcom_softc *, struct tty *); 187 integrate void plcom_txsoft (struct plcom_softc *, struct tty *); 188 integrate void plcom_stsoft (struct plcom_softc *, struct tty *); 189 integrate void plcom_schedrx (struct plcom_softc *); 190 void plcomdiag (void *); 191 192 extern struct cfdriver plcom_cd; 193 194 const struct cdevsw plcom_cdevsw = { 195 plcomopen, plcomclose, plcomread, plcomwrite, plcomioctl, 196 plcomstop, plcomtty, plcompoll, nommap, ttykqfilter, D_TTY 197 }; 198 199 /* 200 * Make this an option variable one can patch. 201 * But be warned: this must be a power of 2! 202 */ 203 u_int plcom_rbuf_size = PLCOM_RING_SIZE; 204 205 /* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */ 206 u_int plcom_rbuf_hiwat = (PLCOM_RING_SIZE * 1) / 4; 207 u_int plcom_rbuf_lowat = (PLCOM_RING_SIZE * 3) / 4; 208 209 static int plcomconsunit = -1; 210 static bus_space_tag_t plcomconstag; 211 static bus_space_handle_t plcomconsioh; 212 static int plcomconsattached; 213 static int plcomconsrate; 214 static tcflag_t plcomconscflag; 215 static struct cnm_state plcom_cnm_state; 216 217 static int ppscap = 218 PPS_TSFMT_TSPEC | 219 PPS_CAPTUREASSERT | 220 PPS_CAPTURECLEAR | 221 #ifdef PPS_SYNC 222 PPS_HARDPPSONASSERT | PPS_HARDPPSONCLEAR | 223 #endif /* PPS_SYNC */ 224 PPS_OFFSETASSERT | PPS_OFFSETCLEAR; 225 226 #ifdef KGDB 227 #include <sys/kgdb.h> 228 229 static int plcom_kgdb_unit; 230 static bus_space_tag_t plcom_kgdb_iot; 231 static bus_space_handle_t plcom_kgdb_ioh; 232 static int plcom_kgdb_attached; 233 234 int plcom_kgdb_getc (void *); 235 void plcom_kgdb_putc (void *, int); 236 #endif /* KGDB */ 237 238 #define PLCOMUNIT_MASK 0x7ffff 239 #define PLCOMDIALOUT_MASK 0x80000 240 241 #define PLCOMUNIT(x) (minor(x) & PLCOMUNIT_MASK) 242 #define PLCOMDIALOUT(x) (minor(x) & PLCOMDIALOUT_MASK) 243 244 #define PLCOM_ISALIVE(sc) ((sc)->enabled != 0 && \ 245 device_is_active((sc)->sc_dev)) 246 247 #define BR BUS_SPACE_BARRIER_READ 248 #define BW BUS_SPACE_BARRIER_WRITE 249 #define PLCOM_BARRIER(t, h, f) bus_space_barrier((t), (h), 0, PLCOM_UART_SIZE, (f)) 250 251 int 252 plcomspeed(long speed, long frequency) 253 { 254 #define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */ 255 256 int x, err; 257 258 #if 0 259 if (speed == 0) 260 return 0; 261 #endif 262 if (speed <= 0) 263 return -1; 264 x = divrnd(frequency / 16, speed); 265 if (x <= 0) 266 return -1; 267 err = divrnd(((quad_t)frequency) * 1000 / 16, speed * x) - 1000; 268 if (err < 0) 269 err = -err; 270 if (err > PLCOM_TOLERANCE) 271 return -1; 272 return x; 273 274 #undef divrnd 275 } 276 277 #ifdef PLCOM_DEBUG 278 int plcom_debug = 0; 279 280 void plcomstatus (struct plcom_softc *, const char *); 281 void 282 plcomstatus(struct plcom_softc *sc, const char *str) 283 { 284 struct tty *tp = sc->sc_tty; 285 286 printf("%s: %s %sclocal %sdcd %sts_carr_on %sdtr %stx_stopped\n", 287 device_xname(sc->sc_dev), str, 288 ISSET(tp->t_cflag, CLOCAL) ? "+" : "-", 289 ISSET(sc->sc_msr, PL01X_MSR_DCD) ? "+" : "-", 290 ISSET(tp->t_state, TS_CARR_ON) ? "+" : "-", 291 ISSET(sc->sc_mcr, PL01X_MCR_DTR) ? "+" : "-", 292 sc->sc_tx_stopped ? "+" : "-"); 293 294 printf("%s: %s %scrtscts %scts %sts_ttstop %srts %xrx_flags\n", 295 device_xname(sc->sc_dev), str, 296 ISSET(tp->t_cflag, CRTSCTS) ? "+" : "-", 297 ISSET(sc->sc_msr, PL01X_MSR_CTS) ? "+" : "-", 298 ISSET(tp->t_state, TS_TTSTOP) ? "+" : "-", 299 ISSET(sc->sc_mcr, PL01X_MCR_RTS) ? "+" : "-", 300 sc->sc_rx_flags); 301 } 302 #endif 303 304 /* XXX this function is not used? */ 305 int 306 plcomprobe1(bus_space_tag_t iot, bus_space_handle_t ioh) 307 { 308 int data; 309 310 /* Disable the UART. */ 311 bus_space_write_1(iot, ioh, plcom_cr, 0); 312 /* Make sure the FIFO is off. */ 313 bus_space_write_1(iot, ioh, plcom_lcr, PL01X_LCR_8BITS); 314 /* Disable interrupts. */ 315 bus_space_write_1(iot, ioh, plcom_iir, 0); 316 317 /* Make sure we swallow anything in the receiving register. */ 318 data = bus_space_read_1(iot, ioh, plcom_dr); 319 320 if (bus_space_read_1(iot, ioh, plcom_lcr) != PL01X_LCR_8BITS) 321 return 0; 322 323 data = bus_space_read_1(iot, ioh, plcom_fr) & (PL01X_FR_RXFF | PL01X_FR_RXFE); 324 325 if (data != PL01X_FR_RXFE) 326 return 0; 327 328 return 1; 329 } 330 331 /* 332 * No locking in this routine; it is only called during attach, 333 * or with the port already locked. 334 */ 335 static void 336 plcom_enable_debugport(struct plcom_softc *sc) 337 { 338 339 /* Turn on line break interrupt, set carrier. */ 340 sc->sc_cr = PL010_CR_RIE | PL010_CR_RTIE | PL01X_CR_UARTEN; 341 bus_space_write_1(sc->sc_iot, sc->sc_ioh, plcom_cr, sc->sc_cr); 342 SET(sc->sc_mcr, PL01X_MCR_DTR | PL01X_MCR_RTS); 343 /* XXX device_unit() abuse */ 344 sc->sc_set_mcr(sc->sc_set_mcr_arg, device_unit(sc->sc_dev), 345 sc->sc_mcr); 346 } 347 348 void 349 plcom_attach_subr(struct plcom_softc *sc) 350 { 351 int unit = sc->sc_iounit; 352 bus_space_tag_t iot = sc->sc_iot; 353 bus_space_handle_t ioh = sc->sc_ioh; 354 struct tty *tp; 355 356 callout_init(&sc->sc_diag_callout, 0); 357 mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_HIGH); 358 359 /* Disable interrupts before configuring the device. */ 360 sc->sc_cr = 0; 361 362 if (plcomconstag && unit == plcomconsunit) { 363 plcomconsattached = 1; 364 365 plcomconstag = iot; 366 plcomconsioh = ioh; 367 368 /* Make sure the console is always "hardwired". */ 369 delay(1000); /* wait for output to finish */ 370 SET(sc->sc_hwflags, PLCOM_HW_CONSOLE); 371 SET(sc->sc_swflags, TIOCFLAG_SOFTCAR); 372 /* Must re-enable the console immediately, or we will 373 hang when trying to print. */ 374 sc->sc_cr = PL01X_CR_UARTEN; 375 } 376 377 bus_space_write_1(iot, ioh, plcom_cr, sc->sc_cr); 378 379 /* The PL010 has a 16-byte fifo, but the tx interrupt triggers when 380 there is space for 8 more bytes. */ 381 sc->sc_fifolen = 8; 382 printf("\n"); 383 384 if (ISSET(sc->sc_hwflags, PLCOM_HW_TXFIFO_DISABLE)) { 385 sc->sc_fifolen = 1; 386 printf("%s: txfifo disabled\n", device_xname(sc->sc_dev)); 387 } 388 389 if (sc->sc_fifolen > 1) 390 SET(sc->sc_hwflags, PLCOM_HW_FIFO); 391 392 tp = tty_alloc(); 393 tp->t_oproc = plcomstart; 394 tp->t_param = plcomparam; 395 tp->t_hwiflow = plcomhwiflow; 396 397 sc->sc_tty = tp; 398 sc->sc_rbuf = malloc(plcom_rbuf_size << 1, M_DEVBUF, M_NOWAIT); 399 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 400 sc->sc_rbavail = plcom_rbuf_size; 401 if (sc->sc_rbuf == NULL) { 402 printf("%s: unable to allocate ring buffer\n", 403 device_xname(sc->sc_dev)); 404 return; 405 } 406 sc->sc_ebuf = sc->sc_rbuf + (plcom_rbuf_size << 1); 407 408 tty_attach(tp); 409 410 if (ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE)) { 411 int maj; 412 413 /* locate the major number */ 414 maj = cdevsw_lookup_major(&plcom_cdevsw); 415 416 cn_tab->cn_dev = makedev(maj, device_unit(sc->sc_dev)); 417 418 printf("%s: console\n", device_xname(sc->sc_dev)); 419 } 420 421 #ifdef KGDB 422 /* 423 * Allow kgdb to "take over" this port. If this is 424 * the kgdb device, it has exclusive use. 425 */ 426 if (iot == plcom_kgdb_iot && unit == plcom_kgdb_unit) { 427 plcom_kgdb_attached = 1; 428 429 SET(sc->sc_hwflags, PLCOM_HW_KGDB); 430 printf("%s: kgdb\n", device_xname(sc->sc_dev)); 431 } 432 #endif 433 434 sc->sc_si = softint_establish(SOFTINT_SERIAL, plcomsoft, sc); 435 436 #ifdef RND_COM 437 rnd_attach_source(&sc->rnd_source, device_xname(sc->sc_dev)), 438 RND_TYPE_TTY, 0); 439 #endif 440 441 /* if there are no enable/disable functions, assume the device 442 is always enabled */ 443 if (!sc->enable) 444 sc->enabled = 1; 445 446 plcom_config(sc); 447 448 SET(sc->sc_hwflags, PLCOM_HW_DEV_OK); 449 } 450 451 void 452 plcom_config(struct plcom_softc *sc) 453 { 454 bus_space_tag_t iot = sc->sc_iot; 455 bus_space_handle_t ioh = sc->sc_ioh; 456 457 /* Disable interrupts before configuring the device. */ 458 sc->sc_cr = 0; 459 bus_space_write_1(iot, ioh, plcom_cr, sc->sc_cr); 460 461 if (ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE|PLCOM_HW_KGDB)) 462 plcom_enable_debugport(sc); 463 } 464 465 int 466 plcom_detach(device_t self, int flags) 467 { 468 struct plcom_softc *sc = device_private(self); 469 int maj, mn; 470 471 if (sc->sc_hwflags & (PLCOM_HW_CONSOLE|PLCOM_HW_KGDB)) 472 return EBUSY; 473 474 if (sc->disable != NULL && sc->enabled != 0) { 475 (*sc->disable)(sc); 476 sc->enabled = 0; 477 } 478 479 /* locate the major number */ 480 maj = cdevsw_lookup_major(&plcom_cdevsw); 481 482 /* Nuke the vnodes for any open instances. */ 483 mn = device_unit(self); 484 vdevgone(maj, mn, mn, VCHR); 485 486 mn |= PLCOMDIALOUT_MASK; 487 vdevgone(maj, mn, mn, VCHR); 488 489 /* Free the receive buffer. */ 490 free(sc->sc_rbuf, M_DEVBUF); 491 492 /* Detach and free the tty. */ 493 tty_detach(sc->sc_tty); 494 tty_free(sc->sc_tty); 495 496 /* Unhook the soft interrupt handler. */ 497 softint_disestablish(sc->sc_si); 498 499 #ifdef RND_COM 500 /* Unhook the entropy source. */ 501 rnd_detach_source(&sc->rnd_source); 502 #endif 503 504 /* Destroy the lock. */ 505 mutex_destroy(&sc->sc_lock); 506 507 return 0; 508 } 509 510 int 511 plcom_activate(device_t self, enum devact act) 512 { 513 struct plcom_softc *sc = device_private(self); 514 515 switch (act) { 516 case DVACT_DEACTIVATE: 517 sc->enabled = 0; 518 return 0; 519 default: 520 return EOPNOTSUPP; 521 } 522 } 523 524 void 525 plcom_shutdown(struct plcom_softc *sc) 526 { 527 struct tty *tp = sc->sc_tty; 528 mutex_spin_enter(&sc->sc_lock); 529 530 /* If we were asserting flow control, then deassert it. */ 531 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 532 plcom_hwiflow(sc); 533 534 /* Clear any break condition set with TIOCSBRK. */ 535 plcom_break(sc, 0); 536 537 /* Turn off PPS capture on last close. */ 538 mutex_spin_enter(&timecounter_lock); 539 sc->sc_ppsmask = 0; 540 sc->ppsparam.mode = 0; 541 mutex_spin_exit(&timecounter_lock); 542 543 /* 544 * Hang up if necessary. Wait a bit, so the other side has time to 545 * notice even if we immediately open the port again. 546 * Avoid tsleeping above splhigh(). 547 */ 548 if (ISSET(tp->t_cflag, HUPCL)) { 549 plcom_modem(sc, 0); 550 mutex_spin_exit(&sc->sc_lock); 551 /* XXX will only timeout */ 552 (void) kpause(ttclos, false, hz, NULL); 553 mutex_spin_enter(&sc->sc_lock); 554 } 555 556 /* Turn off interrupts. */ 557 if (ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE)) 558 /* interrupt on break */ 559 sc->sc_cr = PL010_CR_RIE | PL010_CR_RTIE | PL01X_CR_UARTEN; 560 else 561 sc->sc_cr = 0; 562 bus_space_write_1(sc->sc_iot, sc->sc_ioh, plcom_cr, sc->sc_cr); 563 564 mutex_spin_exit(&sc->sc_lock); 565 if (sc->disable) { 566 #ifdef DIAGNOSTIC 567 if (!sc->enabled) 568 panic("plcom_shutdown: not enabled?"); 569 #endif 570 (*sc->disable)(sc); 571 sc->enabled = 0; 572 } 573 } 574 575 int 576 plcomopen(dev_t dev, int flag, int mode, struct lwp *l) 577 { 578 struct plcom_softc *sc; 579 struct tty *tp; 580 int s; 581 int error; 582 583 sc = device_lookup_private(&plcom_cd, PLCOMUNIT(dev)); 584 if (sc == NULL || !ISSET(sc->sc_hwflags, PLCOM_HW_DEV_OK) || 585 sc->sc_rbuf == NULL) 586 return ENXIO; 587 588 if (!device_is_active(sc->sc_dev)) 589 return ENXIO; 590 591 #ifdef KGDB 592 /* 593 * If this is the kgdb port, no other use is permitted. 594 */ 595 if (ISSET(sc->sc_hwflags, PLCOM_HW_KGDB)) 596 return EBUSY; 597 #endif 598 599 tp = sc->sc_tty; 600 601 if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp)) 602 return (EBUSY); 603 604 s = spltty(); 605 606 /* 607 * Do the following iff this is a first open. 608 */ 609 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 610 struct termios t; 611 612 tp->t_dev = dev; 613 614 if (sc->enable) { 615 if ((*sc->enable)(sc)) { 616 splx(s); 617 printf("%s: device enable failed\n", 618 device_xname(sc->sc_dev)); 619 return EIO; 620 } 621 mutex_spin_enter(&sc->sc_lock); 622 sc->enabled = 1; 623 plcom_config(sc); 624 } else { 625 mutex_spin_enter(&sc->sc_lock); 626 } 627 628 /* Turn on interrupts. */ 629 /* IER_ERXRDY | IER_ERLS | IER_EMSC; */ 630 sc->sc_cr = PL010_CR_RIE | PL010_CR_RTIE | PL010_CR_MSIE | PL01X_CR_UARTEN; 631 bus_space_write_1(sc->sc_iot, sc->sc_ioh, plcom_cr, sc->sc_cr); 632 633 /* Fetch the current modem control status, needed later. */ 634 sc->sc_msr = bus_space_read_1(sc->sc_iot, sc->sc_ioh, plcom_fr); 635 636 /* Clear PPS capture state on first open. */ 637 638 mutex_spin_enter(&timecounter_lock); 639 sc->sc_ppsmask = 0; 640 sc->ppsparam.mode = 0; 641 mutex_spin_exit(&timecounter_lock); 642 643 mutex_spin_enter(&sc->sc_lock); 644 645 /* 646 * Initialize the termios status to the defaults. Add in the 647 * sticky bits from TIOCSFLAGS. 648 */ 649 t.c_ispeed = 0; 650 if (ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE)) { 651 t.c_ospeed = plcomconsrate; 652 t.c_cflag = plcomconscflag; 653 } else { 654 t.c_ospeed = TTYDEF_SPEED; 655 t.c_cflag = TTYDEF_CFLAG; 656 } 657 if (ISSET(sc->sc_swflags, TIOCFLAG_CLOCAL)) 658 SET(t.c_cflag, CLOCAL); 659 if (ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS)) 660 SET(t.c_cflag, CRTSCTS); 661 if (ISSET(sc->sc_swflags, TIOCFLAG_MDMBUF)) 662 SET(t.c_cflag, MDMBUF); 663 /* Make sure plcomparam() will do something. */ 664 tp->t_ospeed = 0; 665 (void) plcomparam(tp, &t); 666 tp->t_iflag = TTYDEF_IFLAG; 667 tp->t_oflag = TTYDEF_OFLAG; 668 tp->t_lflag = TTYDEF_LFLAG; 669 ttychars(tp); 670 ttsetwater(tp); 671 672 mutex_spin_enter(&sc->sc_lock); 673 674 /* 675 * Turn on DTR. We must always do this, even if carrier is not 676 * present, because otherwise we'd have to use TIOCSDTR 677 * immediately after setting CLOCAL, which applications do not 678 * expect. We always assert DTR while the device is open 679 * unless explicitly requested to deassert it. 680 */ 681 plcom_modem(sc, 1); 682 683 /* Clear the input ring, and unblock. */ 684 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 685 sc->sc_rbavail = plcom_rbuf_size; 686 plcom_iflush(sc); 687 CLR(sc->sc_rx_flags, RX_ANY_BLOCK); 688 plcom_hwiflow(sc); 689 690 #ifdef PLCOM_DEBUG 691 if (plcom_debug) 692 plcomstatus(sc, "plcomopen "); 693 #endif 694 695 mutex_spin_exit(&sc->sc_lock); 696 } 697 698 splx(s); 699 700 error = ttyopen(tp, PLCOMDIALOUT(dev), ISSET(flag, O_NONBLOCK)); 701 if (error) 702 goto bad; 703 704 error = (*tp->t_linesw->l_open)(dev, tp); 705 if (error) 706 goto bad; 707 708 return 0; 709 710 bad: 711 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 712 /* 713 * We failed to open the device, and nobody else had it opened. 714 * Clean up the state as appropriate. 715 */ 716 plcom_shutdown(sc); 717 } 718 719 return error; 720 } 721 722 int 723 plcomclose(dev_t dev, int flag, int mode, struct lwp *l) 724 { 725 struct plcom_softc *sc = 726 device_lookup_private(&plcom_cd, PLCOMUNIT(dev)); 727 struct tty *tp = sc->sc_tty; 728 729 /* XXX This is for cons.c. */ 730 if (!ISSET(tp->t_state, TS_ISOPEN)) 731 return 0; 732 733 (*tp->t_linesw->l_close)(tp, flag); 734 ttyclose(tp); 735 736 if (PLCOM_ISALIVE(sc) == 0) 737 return 0; 738 739 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 740 /* 741 * Although we got a last close, the device may still be in 742 * use; e.g. if this was the dialout node, and there are still 743 * processes waiting for carrier on the non-dialout node. 744 */ 745 plcom_shutdown(sc); 746 } 747 748 return 0; 749 } 750 751 int 752 plcomread(dev_t dev, struct uio *uio, int flag) 753 { 754 struct plcom_softc *sc = 755 device_lookup_private(&plcom_cd, PLCOMUNIT(dev)); 756 struct tty *tp = sc->sc_tty; 757 758 if (PLCOM_ISALIVE(sc) == 0) 759 return EIO; 760 761 return (*tp->t_linesw->l_read)(tp, uio, flag); 762 } 763 764 int 765 plcomwrite(dev_t dev, struct uio *uio, int flag) 766 { 767 struct plcom_softc *sc = 768 device_lookup_private(&plcom_cd, PLCOMUNIT(dev)); 769 struct tty *tp = sc->sc_tty; 770 771 if (PLCOM_ISALIVE(sc) == 0) 772 return EIO; 773 774 return (*tp->t_linesw->l_write)(tp, uio, flag); 775 } 776 777 int 778 plcompoll(dev_t dev, int events, struct lwp *l) 779 { 780 struct plcom_softc *sc = 781 device_lookup_private(&plcom_cd, PLCOMUNIT(dev)); 782 struct tty *tp = sc->sc_tty; 783 784 if (PLCOM_ISALIVE(sc) == 0) 785 return EIO; 786 787 return (*tp->t_linesw->l_poll)(tp, events, l); 788 } 789 790 struct tty * 791 plcomtty(dev_t dev) 792 { 793 struct plcom_softc *sc = 794 device_lookup_private(&plcom_cd, PLCOMUNIT(dev)); 795 struct tty *tp = sc->sc_tty; 796 797 return tp; 798 } 799 800 int 801 plcomioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 802 { 803 struct plcom_softc *sc = 804 device_lookup_private(&plcom_cd, PLCOMUNIT(dev)); 805 struct tty *tp = sc->sc_tty; 806 int error; 807 808 if (PLCOM_ISALIVE(sc) == 0) 809 return EIO; 810 811 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 812 if (error != EPASSTHROUGH) 813 return error; 814 815 error = ttioctl(tp, cmd, data, flag, l); 816 if (error != EPASSTHROUGH) 817 return error; 818 819 error = 0; 820 821 mutex_spin_enter(&sc->sc_lock); 822 switch (cmd) { 823 case TIOCSBRK: 824 plcom_break(sc, 1); 825 break; 826 827 case TIOCCBRK: 828 plcom_break(sc, 0); 829 break; 830 831 case TIOCSDTR: 832 plcom_modem(sc, 1); 833 break; 834 835 case TIOCCDTR: 836 plcom_modem(sc, 0); 837 break; 838 839 case TIOCGFLAGS: 840 *(int *)data = sc->sc_swflags; 841 break; 842 843 case TIOCSFLAGS: 844 error = kauth_authorize_device_tty(l->l_cred, 845 KAUTH_DEVICE_TTY_PRIVSET, tp); 846 if (error) 847 break; 848 sc->sc_swflags = *(int *)data; 849 break; 850 851 case TIOCMSET: 852 case TIOCMBIS: 853 case TIOCMBIC: 854 tiocm_to_plcom(sc, cmd, *(int *)data); 855 break; 856 857 case TIOCMGET: 858 *(int *)data = plcom_to_tiocm(sc); 859 break; 860 861 case PPS_IOC_CREATE: 862 break; 863 864 case PPS_IOC_DESTROY: 865 break; 866 867 case PPS_IOC_GETPARAMS: { 868 pps_params_t *pp; 869 pp = (pps_params_t *)data; 870 mutex_spin_enter(&timecounter_lock); 871 *pp = sc->ppsparam; 872 mutex_spin_exit(&timecounter_lock); 873 break; 874 } 875 876 case PPS_IOC_SETPARAMS: { 877 pps_params_t *pp; 878 int mode; 879 pp = (pps_params_t *)data; 880 mutex_spin_enter(&timecounter_lock); 881 if (pp->mode & ~ppscap) { 882 error = EINVAL; 883 mutex_spin_exit(&timecounter_lock); 884 break; 885 } 886 sc->ppsparam = *pp; 887 /* 888 * Compute msr masks from user-specified timestamp state. 889 */ 890 mode = sc->ppsparam.mode; 891 #ifdef PPS_SYNC 892 if (mode & PPS_HARDPPSONASSERT) { 893 mode |= PPS_CAPTUREASSERT; 894 /* XXX revoke any previous HARDPPS source */ 895 } 896 if (mode & PPS_HARDPPSONCLEAR) { 897 mode |= PPS_CAPTURECLEAR; 898 /* XXX revoke any previous HARDPPS source */ 899 } 900 #endif /* PPS_SYNC */ 901 switch (mode & PPS_CAPTUREBOTH) { 902 case 0: 903 sc->sc_ppsmask = 0; 904 break; 905 906 case PPS_CAPTUREASSERT: 907 sc->sc_ppsmask = PL01X_MSR_DCD; 908 sc->sc_ppsassert = PL01X_MSR_DCD; 909 sc->sc_ppsclear = -1; 910 break; 911 912 case PPS_CAPTURECLEAR: 913 sc->sc_ppsmask = PL01X_MSR_DCD; 914 sc->sc_ppsassert = -1; 915 sc->sc_ppsclear = 0; 916 break; 917 918 case PPS_CAPTUREBOTH: 919 sc->sc_ppsmask = PL01X_MSR_DCD; 920 sc->sc_ppsassert = PL01X_MSR_DCD; 921 sc->sc_ppsclear = 0; 922 break; 923 924 default: 925 error = EINVAL; 926 break; 927 } 928 mutex_spin_exit(&timecounter_lock); 929 break; 930 } 931 932 case PPS_IOC_GETCAP: 933 *(int*)data = ppscap; 934 break; 935 936 case PPS_IOC_FETCH: { 937 pps_info_t *pi; 938 pi = (pps_info_t *)data; 939 mutex_spin_enter(&timecounter_lock); 940 *pi = sc->ppsinfo; 941 mutex_spin_exit(&timecounter_lock); 942 break; 943 } 944 945 case TIOCDCDTIMESTAMP: /* XXX old, overloaded API used by xntpd v3 */ 946 /* 947 * Some GPS clocks models use the falling rather than 948 * rising edge as the on-the-second signal. 949 * The old API has no way to specify PPS polarity. 950 */ 951 mutex_spin_enter(&timecounter_lock); 952 sc->sc_ppsmask = PL01X_MSR_DCD; 953 #ifndef PPS_TRAILING_EDGE 954 sc->sc_ppsassert = PL01X_MSR_DCD; 955 sc->sc_ppsclear = -1; 956 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 957 &sc->ppsinfo.assert_timestamp); 958 #else 959 sc->sc_ppsassert = -1 960 sc->sc_ppsclear = 0; 961 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 962 &sc->ppsinfo.clear_timestamp); 963 #endif 964 mutex_spin_exit(&timecounter_lock); 965 break; 966 967 default: 968 error = EPASSTHROUGH; 969 break; 970 } 971 972 mutex_spin_exit(&sc->sc_lock); 973 974 #ifdef PLCOM_DEBUG 975 if (plcom_debug) 976 plcomstatus(sc, "plcomioctl "); 977 #endif 978 979 return error; 980 } 981 982 integrate void 983 plcom_schedrx(struct plcom_softc *sc) 984 { 985 986 sc->sc_rx_ready = 1; 987 988 /* Wake up the poller. */ 989 softint_schedule(sc->sc_si); 990 } 991 992 void 993 plcom_break(struct plcom_softc *sc, int onoff) 994 { 995 996 if (onoff) 997 SET(sc->sc_lcr, PL01X_LCR_BRK); 998 else 999 CLR(sc->sc_lcr, PL01X_LCR_BRK); 1000 1001 if (!sc->sc_heldchange) { 1002 if (sc->sc_tx_busy) { 1003 sc->sc_heldtbc = sc->sc_tbc; 1004 sc->sc_tbc = 0; 1005 sc->sc_heldchange = 1; 1006 } else 1007 plcom_loadchannelregs(sc); 1008 } 1009 } 1010 1011 void 1012 plcom_modem(struct plcom_softc *sc, int onoff) 1013 { 1014 1015 if (sc->sc_mcr_dtr == 0) 1016 return; 1017 1018 if (onoff) 1019 SET(sc->sc_mcr, sc->sc_mcr_dtr); 1020 else 1021 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 1022 1023 if (!sc->sc_heldchange) { 1024 if (sc->sc_tx_busy) { 1025 sc->sc_heldtbc = sc->sc_tbc; 1026 sc->sc_tbc = 0; 1027 sc->sc_heldchange = 1; 1028 } else 1029 plcom_loadchannelregs(sc); 1030 } 1031 } 1032 1033 void 1034 tiocm_to_plcom(struct plcom_softc *sc, u_long how, int ttybits) 1035 { 1036 u_char plcombits; 1037 1038 plcombits = 0; 1039 if (ISSET(ttybits, TIOCM_DTR)) 1040 SET(plcombits, PL01X_MCR_DTR); 1041 if (ISSET(ttybits, TIOCM_RTS)) 1042 SET(plcombits, PL01X_MCR_RTS); 1043 1044 switch (how) { 1045 case TIOCMBIC: 1046 CLR(sc->sc_mcr, plcombits); 1047 break; 1048 1049 case TIOCMBIS: 1050 SET(sc->sc_mcr, plcombits); 1051 break; 1052 1053 case TIOCMSET: 1054 CLR(sc->sc_mcr, PL01X_MCR_DTR | PL01X_MCR_RTS); 1055 SET(sc->sc_mcr, plcombits); 1056 break; 1057 } 1058 1059 if (!sc->sc_heldchange) { 1060 if (sc->sc_tx_busy) { 1061 sc->sc_heldtbc = sc->sc_tbc; 1062 sc->sc_tbc = 0; 1063 sc->sc_heldchange = 1; 1064 } else 1065 plcom_loadchannelregs(sc); 1066 } 1067 } 1068 1069 int 1070 plcom_to_tiocm(struct plcom_softc *sc) 1071 { 1072 u_char plcombits; 1073 int ttybits = 0; 1074 1075 plcombits = sc->sc_mcr; 1076 if (ISSET(plcombits, PL01X_MCR_DTR)) 1077 SET(ttybits, TIOCM_DTR); 1078 if (ISSET(plcombits, PL01X_MCR_RTS)) 1079 SET(ttybits, TIOCM_RTS); 1080 1081 plcombits = sc->sc_msr; 1082 if (ISSET(plcombits, PL01X_MSR_DCD)) 1083 SET(ttybits, TIOCM_CD); 1084 if (ISSET(plcombits, PL01X_MSR_CTS)) 1085 SET(ttybits, TIOCM_CTS); 1086 if (ISSET(plcombits, PL01X_MSR_DSR)) 1087 SET(ttybits, TIOCM_DSR); 1088 1089 if (sc->sc_cr != 0) 1090 SET(ttybits, TIOCM_LE); 1091 1092 return ttybits; 1093 } 1094 1095 static u_char 1096 cflag2lcr(tcflag_t cflag) 1097 { 1098 u_char lcr = 0; 1099 1100 switch (ISSET(cflag, CSIZE)) { 1101 case CS5: 1102 SET(lcr, PL01X_LCR_5BITS); 1103 break; 1104 case CS6: 1105 SET(lcr, PL01X_LCR_6BITS); 1106 break; 1107 case CS7: 1108 SET(lcr, PL01X_LCR_7BITS); 1109 break; 1110 case CS8: 1111 SET(lcr, PL01X_LCR_8BITS); 1112 break; 1113 } 1114 if (ISSET(cflag, PARENB)) { 1115 SET(lcr, PL01X_LCR_PEN); 1116 if (!ISSET(cflag, PARODD)) 1117 SET(lcr, PL01X_LCR_EPS); 1118 } 1119 if (ISSET(cflag, CSTOPB)) 1120 SET(lcr, PL01X_LCR_STP2); 1121 1122 return lcr; 1123 } 1124 1125 int 1126 plcomparam(struct tty *tp, struct termios *t) 1127 { 1128 struct plcom_softc *sc = 1129 device_lookup_private(&plcom_cd, PLCOMUNIT(tp->t_dev)); 1130 int ospeed; 1131 u_char lcr; 1132 1133 if (PLCOM_ISALIVE(sc) == 0) 1134 return EIO; 1135 1136 ospeed = plcomspeed(t->c_ospeed, sc->sc_frequency); 1137 1138 /* Check requested parameters. */ 1139 if (ospeed < 0) 1140 return EINVAL; 1141 if (t->c_ispeed && t->c_ispeed != t->c_ospeed) 1142 return EINVAL; 1143 1144 /* 1145 * For the console, always force CLOCAL and !HUPCL, so that the port 1146 * is always active. 1147 */ 1148 if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) || 1149 ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE)) { 1150 SET(t->c_cflag, CLOCAL); 1151 CLR(t->c_cflag, HUPCL); 1152 } 1153 1154 /* 1155 * If there were no changes, don't do anything. This avoids dropping 1156 * input and improves performance when all we did was frob things like 1157 * VMIN and VTIME. 1158 */ 1159 if (tp->t_ospeed == t->c_ospeed && 1160 tp->t_cflag == t->c_cflag) 1161 return 0; 1162 1163 lcr = ISSET(sc->sc_lcr, PL01X_LCR_BRK) | cflag2lcr(t->c_cflag); 1164 1165 mutex_spin_enter(&sc->sc_lock); 1166 1167 sc->sc_lcr = lcr; 1168 1169 /* 1170 * PL010 has a fixed-length FIFO trigger point. 1171 */ 1172 if (ISSET(sc->sc_hwflags, PLCOM_HW_FIFO)) 1173 sc->sc_fifo = 1; 1174 else 1175 sc->sc_fifo = 0; 1176 1177 if (sc->sc_fifo) 1178 SET(sc->sc_lcr, PL01X_LCR_FEN); 1179 1180 /* 1181 * If we're not in a mode that assumes a connection is present, then 1182 * ignore carrier changes. 1183 */ 1184 if (ISSET(t->c_cflag, CLOCAL | MDMBUF)) 1185 sc->sc_msr_dcd = 0; 1186 else 1187 sc->sc_msr_dcd = PL01X_MSR_DCD; 1188 /* 1189 * Set the flow control pins depending on the current flow control 1190 * mode. 1191 */ 1192 if (ISSET(t->c_cflag, CRTSCTS)) { 1193 sc->sc_mcr_dtr = PL01X_MCR_DTR; 1194 sc->sc_mcr_rts = PL01X_MCR_RTS; 1195 sc->sc_msr_cts = PL01X_MSR_CTS; 1196 } else if (ISSET(t->c_cflag, MDMBUF)) { 1197 /* 1198 * For DTR/DCD flow control, make sure we don't toggle DTR for 1199 * carrier detection. 1200 */ 1201 sc->sc_mcr_dtr = 0; 1202 sc->sc_mcr_rts = PL01X_MCR_DTR; 1203 sc->sc_msr_cts = PL01X_MSR_DCD; 1204 } else { 1205 /* 1206 * If no flow control, then always set RTS. This will make 1207 * the other side happy if it mistakenly thinks we're doing 1208 * RTS/CTS flow control. 1209 */ 1210 sc->sc_mcr_dtr = PL01X_MCR_DTR | PL01X_MCR_RTS; 1211 sc->sc_mcr_rts = 0; 1212 sc->sc_msr_cts = 0; 1213 if (ISSET(sc->sc_mcr, PL01X_MCR_DTR)) 1214 SET(sc->sc_mcr, PL01X_MCR_RTS); 1215 else 1216 CLR(sc->sc_mcr, PL01X_MCR_RTS); 1217 } 1218 sc->sc_msr_mask = sc->sc_msr_cts | sc->sc_msr_dcd; 1219 1220 #if 0 1221 if (ospeed == 0) 1222 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 1223 else 1224 SET(sc->sc_mcr, sc->sc_mcr_dtr); 1225 #endif 1226 1227 sc->sc_dlbl = ospeed; 1228 sc->sc_dlbh = ospeed >> 8; 1229 1230 /* And copy to tty. */ 1231 tp->t_ispeed = 0; 1232 tp->t_ospeed = t->c_ospeed; 1233 tp->t_cflag = t->c_cflag; 1234 1235 if (!sc->sc_heldchange) { 1236 if (sc->sc_tx_busy) { 1237 sc->sc_heldtbc = sc->sc_tbc; 1238 sc->sc_tbc = 0; 1239 sc->sc_heldchange = 1; 1240 } else 1241 plcom_loadchannelregs(sc); 1242 } 1243 1244 if (!ISSET(t->c_cflag, CHWFLOW)) { 1245 /* Disable the high water mark. */ 1246 sc->sc_r_hiwat = 0; 1247 sc->sc_r_lowat = 0; 1248 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1249 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1250 plcom_schedrx(sc); 1251 } 1252 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 1253 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 1254 plcom_hwiflow(sc); 1255 } 1256 } else { 1257 sc->sc_r_hiwat = plcom_rbuf_hiwat; 1258 sc->sc_r_lowat = plcom_rbuf_lowat; 1259 } 1260 1261 mutex_spin_exit(&sc->sc_lock); 1262 1263 /* 1264 * Update the tty layer's idea of the carrier bit, in case we changed 1265 * CLOCAL or MDMBUF. We don't hang up here; we only do that by 1266 * explicit request. 1267 */ 1268 (void) (*tp->t_linesw->l_modem)(tp, ISSET(sc->sc_msr, PL01X_MSR_DCD)); 1269 1270 #ifdef PLCOM_DEBUG 1271 if (plcom_debug) 1272 plcomstatus(sc, "plcomparam "); 1273 #endif 1274 1275 if (!ISSET(t->c_cflag, CHWFLOW)) { 1276 if (sc->sc_tx_stopped) { 1277 sc->sc_tx_stopped = 0; 1278 plcomstart(tp); 1279 } 1280 } 1281 1282 return 0; 1283 } 1284 1285 void 1286 plcom_iflush(struct plcom_softc *sc) 1287 { 1288 bus_space_tag_t iot = sc->sc_iot; 1289 bus_space_handle_t ioh = sc->sc_ioh; 1290 #ifdef DIAGNOSTIC 1291 int reg; 1292 #endif 1293 int timo; 1294 1295 #ifdef DIAGNOSTIC 1296 reg = 0xffff; 1297 #endif 1298 timo = 50000; 1299 /* flush any pending I/O */ 1300 while (! ISSET(bus_space_read_1(iot, ioh, plcom_fr), PL01X_FR_RXFE) 1301 && --timo) 1302 #ifdef DIAGNOSTIC 1303 reg = 1304 #else 1305 (void) 1306 #endif 1307 bus_space_read_1(iot, ioh, plcom_dr); 1308 #ifdef DIAGNOSTIC 1309 if (!timo) 1310 printf("%s: plcom_iflush timeout %02x\n", device_xname(sc->sc_dev), 1311 reg); 1312 #endif 1313 } 1314 1315 void 1316 plcom_loadchannelregs(struct plcom_softc *sc) 1317 { 1318 bus_space_tag_t iot = sc->sc_iot; 1319 bus_space_handle_t ioh = sc->sc_ioh; 1320 1321 /* XXXXX necessary? */ 1322 plcom_iflush(sc); 1323 1324 bus_space_write_1(iot, ioh, plcom_cr, 0); 1325 1326 bus_space_write_1(iot, ioh, plcom_dlbl, sc->sc_dlbl); 1327 bus_space_write_1(iot, ioh, plcom_dlbh, sc->sc_dlbh); 1328 bus_space_write_1(iot, ioh, plcom_lcr, sc->sc_lcr); 1329 /* XXX device_unit() abuse */ 1330 sc->sc_set_mcr(sc->sc_set_mcr_arg, device_unit(sc->sc_dev), 1331 sc->sc_mcr_active = sc->sc_mcr); 1332 1333 bus_space_write_1(iot, ioh, plcom_cr, sc->sc_cr); 1334 } 1335 1336 int 1337 plcomhwiflow(struct tty *tp, int block) 1338 { 1339 struct plcom_softc *sc = 1340 device_lookup_private(&plcom_cd, PLCOMUNIT(tp->t_dev)); 1341 1342 if (PLCOM_ISALIVE(sc) == 0) 1343 return 0; 1344 1345 if (sc->sc_mcr_rts == 0) 1346 return 0; 1347 1348 mutex_spin_enter(&sc->sc_lock); 1349 1350 if (block) { 1351 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1352 SET(sc->sc_rx_flags, RX_TTY_BLOCKED); 1353 plcom_hwiflow(sc); 1354 } 1355 } else { 1356 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1357 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1358 plcom_schedrx(sc); 1359 } 1360 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1361 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED); 1362 plcom_hwiflow(sc); 1363 } 1364 } 1365 1366 mutex_spin_exit(&sc->sc_lock); 1367 return 1; 1368 } 1369 1370 /* 1371 * (un)block input via hw flowcontrol 1372 */ 1373 void 1374 plcom_hwiflow(struct plcom_softc *sc) 1375 { 1376 if (sc->sc_mcr_rts == 0) 1377 return; 1378 1379 if (ISSET(sc->sc_rx_flags, RX_ANY_BLOCK)) { 1380 CLR(sc->sc_mcr, sc->sc_mcr_rts); 1381 CLR(sc->sc_mcr_active, sc->sc_mcr_rts); 1382 } else { 1383 SET(sc->sc_mcr, sc->sc_mcr_rts); 1384 SET(sc->sc_mcr_active, sc->sc_mcr_rts); 1385 } 1386 /* XXX device_unit() abuse */ 1387 sc->sc_set_mcr(sc->sc_set_mcr_arg, device_unit(sc->sc_dev), 1388 sc->sc_mcr_active); 1389 } 1390 1391 1392 void 1393 plcomstart(struct tty *tp) 1394 { 1395 struct plcom_softc *sc = 1396 device_lookup_private(&plcom_cd, PLCOMUNIT(tp->t_dev)); 1397 bus_space_tag_t iot = sc->sc_iot; 1398 bus_space_handle_t ioh = sc->sc_ioh; 1399 int s; 1400 1401 if (PLCOM_ISALIVE(sc) == 0) 1402 return; 1403 1404 s = spltty(); 1405 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 1406 goto out; 1407 if (sc->sc_tx_stopped) 1408 goto out; 1409 1410 if (!ttypull(tp)) 1411 goto out; 1412 1413 /* Grab the first contiguous region of buffer space. */ 1414 { 1415 u_char *tba; 1416 int tbc; 1417 1418 tba = tp->t_outq.c_cf; 1419 tbc = ndqb(&tp->t_outq, 0); 1420 1421 mutex_spin_enter(&sc->sc_lock); 1422 1423 sc->sc_tba = tba; 1424 sc->sc_tbc = tbc; 1425 } 1426 1427 SET(tp->t_state, TS_BUSY); 1428 sc->sc_tx_busy = 1; 1429 1430 /* Enable transmit completion interrupts if necessary. */ 1431 if (!ISSET(sc->sc_cr, PL010_CR_TIE)) { 1432 SET(sc->sc_cr, PL010_CR_TIE); 1433 bus_space_write_1(iot, ioh, plcom_cr, sc->sc_cr); 1434 } 1435 1436 /* Output the first chunk of the contiguous buffer. */ 1437 { 1438 int n; 1439 1440 n = sc->sc_tbc; 1441 if (n > sc->sc_fifolen) 1442 n = sc->sc_fifolen; 1443 bus_space_write_multi_1(iot, ioh, plcom_dr, sc->sc_tba, n); 1444 sc->sc_tbc -= n; 1445 sc->sc_tba += n; 1446 } 1447 mutex_spin_exit(&sc->sc_lock); 1448 out: 1449 splx(s); 1450 return; 1451 } 1452 1453 /* 1454 * Stop output on a line. 1455 */ 1456 void 1457 plcomstop(struct tty *tp, int flag) 1458 { 1459 struct plcom_softc *sc = 1460 device_lookup_private(&plcom_cd, PLCOMUNIT(tp->t_dev)); 1461 1462 mutex_spin_enter(&sc->sc_lock); 1463 if (ISSET(tp->t_state, TS_BUSY)) { 1464 /* Stop transmitting at the next chunk. */ 1465 sc->sc_tbc = 0; 1466 sc->sc_heldtbc = 0; 1467 if (!ISSET(tp->t_state, TS_TTSTOP)) 1468 SET(tp->t_state, TS_FLUSH); 1469 } 1470 mutex_spin_exit(&sc->sc_lock); 1471 } 1472 1473 void 1474 plcomdiag(void *arg) 1475 { 1476 struct plcom_softc *sc = arg; 1477 int overflows, floods; 1478 1479 mutex_spin_enter(&sc->sc_lock); 1480 overflows = sc->sc_overflows; 1481 sc->sc_overflows = 0; 1482 floods = sc->sc_floods; 1483 sc->sc_floods = 0; 1484 sc->sc_errors = 0; 1485 mutex_spin_exit(&sc->sc_lock); 1486 1487 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1488 device_xname(sc->sc_dev), 1489 overflows, overflows == 1 ? "" : "s", 1490 floods, floods == 1 ? "" : "s"); 1491 } 1492 1493 integrate void 1494 plcom_rxsoft(struct plcom_softc *sc, struct tty *tp) 1495 { 1496 int (*rint) (int, struct tty *) = tp->t_linesw->l_rint; 1497 u_char *get, *end; 1498 u_int cc, scc; 1499 u_char rsr; 1500 int code; 1501 1502 end = sc->sc_ebuf; 1503 get = sc->sc_rbget; 1504 scc = cc = plcom_rbuf_size - sc->sc_rbavail; 1505 1506 if (cc == plcom_rbuf_size) { 1507 sc->sc_floods++; 1508 if (sc->sc_errors++ == 0) 1509 callout_reset(&sc->sc_diag_callout, 60 * hz, 1510 plcomdiag, sc); 1511 } 1512 1513 while (cc) { 1514 code = get[0]; 1515 rsr = get[1]; 1516 if (ISSET(rsr, PL01X_RSR_ERROR)) { 1517 if (ISSET(rsr, PL01X_RSR_OE)) { 1518 sc->sc_overflows++; 1519 if (sc->sc_errors++ == 0) 1520 callout_reset(&sc->sc_diag_callout, 1521 60 * hz, plcomdiag, sc); 1522 } 1523 if (ISSET(rsr, PL01X_RSR_BE | PL01X_RSR_FE)) 1524 SET(code, TTY_FE); 1525 if (ISSET(rsr, PL01X_RSR_PE)) 1526 SET(code, TTY_PE); 1527 } 1528 if ((*rint)(code, tp) == -1) { 1529 /* 1530 * The line discipline's buffer is out of space. 1531 */ 1532 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1533 /* 1534 * We're either not using flow control, or the 1535 * line discipline didn't tell us to block for 1536 * some reason. Either way, we have no way to 1537 * know when there's more space available, so 1538 * just drop the rest of the data. 1539 */ 1540 get += cc << 1; 1541 if (get >= end) 1542 get -= plcom_rbuf_size << 1; 1543 cc = 0; 1544 } else { 1545 /* 1546 * Don't schedule any more receive processing 1547 * until the line discipline tells us there's 1548 * space available (through plcomhwiflow()). 1549 * Leave the rest of the data in the input 1550 * buffer. 1551 */ 1552 SET(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1553 } 1554 break; 1555 } 1556 get += 2; 1557 if (get >= end) 1558 get = sc->sc_rbuf; 1559 cc--; 1560 } 1561 1562 if (cc != scc) { 1563 sc->sc_rbget = get; 1564 mutex_spin_enter(&sc->sc_lock); 1565 1566 cc = sc->sc_rbavail += scc - cc; 1567 /* Buffers should be ok again, release possible block. */ 1568 if (cc >= sc->sc_r_lowat) { 1569 if (ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1570 CLR(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1571 SET(sc->sc_cr, PL010_CR_RIE | PL010_CR_RTIE); 1572 bus_space_write_1(sc->sc_iot, sc->sc_ioh, plcom_cr, sc->sc_cr); 1573 } 1574 if (ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED)) { 1575 CLR(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1576 plcom_hwiflow(sc); 1577 } 1578 } 1579 mutex_spin_exit(&sc->sc_lock); 1580 } 1581 } 1582 1583 integrate void 1584 plcom_txsoft(struct plcom_softc *sc, struct tty *tp) 1585 { 1586 1587 CLR(tp->t_state, TS_BUSY); 1588 if (ISSET(tp->t_state, TS_FLUSH)) 1589 CLR(tp->t_state, TS_FLUSH); 1590 else 1591 ndflush(&tp->t_outq, (int)(sc->sc_tba - tp->t_outq.c_cf)); 1592 (*tp->t_linesw->l_start)(tp); 1593 } 1594 1595 integrate void 1596 plcom_stsoft(struct plcom_softc *sc, struct tty *tp) 1597 { 1598 u_char msr, delta; 1599 1600 mutex_spin_enter(&sc->sc_lock); 1601 msr = sc->sc_msr; 1602 delta = sc->sc_msr_delta; 1603 sc->sc_msr_delta = 0; 1604 mutex_spin_exit(&sc->sc_lock); 1605 1606 if (ISSET(delta, sc->sc_msr_dcd)) { 1607 /* 1608 * Inform the tty layer that carrier detect changed. 1609 */ 1610 (void) (*tp->t_linesw->l_modem)(tp, ISSET(msr, PL01X_MSR_DCD)); 1611 } 1612 1613 if (ISSET(delta, sc->sc_msr_cts)) { 1614 /* Block or unblock output according to flow control. */ 1615 if (ISSET(msr, sc->sc_msr_cts)) { 1616 sc->sc_tx_stopped = 0; 1617 (*tp->t_linesw->l_start)(tp); 1618 } else { 1619 sc->sc_tx_stopped = 1; 1620 } 1621 } 1622 1623 #ifdef PLCOM_DEBUG 1624 if (plcom_debug) 1625 plcomstatus(sc, "plcom_stsoft"); 1626 #endif 1627 } 1628 1629 void 1630 plcomsoft(void *arg) 1631 { 1632 struct plcom_softc *sc = arg; 1633 struct tty *tp; 1634 1635 if (PLCOM_ISALIVE(sc) == 0) 1636 return; 1637 1638 tp = sc->sc_tty; 1639 1640 if (sc->sc_rx_ready) { 1641 sc->sc_rx_ready = 0; 1642 plcom_rxsoft(sc, tp); 1643 } 1644 1645 if (sc->sc_st_check) { 1646 sc->sc_st_check = 0; 1647 plcom_stsoft(sc, tp); 1648 } 1649 1650 if (sc->sc_tx_done) { 1651 sc->sc_tx_done = 0; 1652 plcom_txsoft(sc, tp); 1653 } 1654 } 1655 1656 int 1657 plcomintr(void *arg) 1658 { 1659 struct plcom_softc *sc = arg; 1660 bus_space_tag_t iot = sc->sc_iot; 1661 bus_space_handle_t ioh = sc->sc_ioh; 1662 u_char *put, *end; 1663 u_int cc; 1664 u_char rsr, iir; 1665 1666 if (PLCOM_ISALIVE(sc) == 0) 1667 return 0; 1668 1669 mutex_spin_enter(&sc->sc_lock); 1670 iir = bus_space_read_1(iot, ioh, plcom_iir); 1671 if (! ISSET(iir, PL010_IIR_IMASK)) { 1672 mutex_spin_exit(&sc->sc_lock); 1673 return 0; 1674 } 1675 1676 end = sc->sc_ebuf; 1677 put = sc->sc_rbput; 1678 cc = sc->sc_rbavail; 1679 1680 do { 1681 u_char msr, delta, fr; 1682 1683 fr = bus_space_read_1(iot, ioh, plcom_fr); 1684 1685 if (!ISSET(fr, PL01X_FR_RXFE) && 1686 !ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1687 while (cc > 0) { 1688 int cn_trapped = 0; 1689 put[0] = bus_space_read_1(iot, ioh, 1690 plcom_dr); 1691 rsr = bus_space_read_1(iot, ioh, plcom_rsr); 1692 /* Clear any error status. */ 1693 if (ISSET(rsr, PL01X_RSR_ERROR)) 1694 bus_space_write_1(iot, ioh, plcom_ecr, 1695 0); 1696 if (ISSET(rsr, PL01X_RSR_BE)) { 1697 cn_trapped = 0; 1698 cn_check_magic(sc->sc_tty->t_dev, 1699 CNC_BREAK, plcom_cnm_state); 1700 if (cn_trapped) 1701 continue; 1702 #if defined(KGDB) 1703 if (ISSET(sc->sc_hwflags, 1704 PLCOM_HW_KGDB)) { 1705 kgdb_connect(1); 1706 continue; 1707 } 1708 #endif 1709 } 1710 1711 put[1] = rsr; 1712 cn_trapped = 0; 1713 cn_check_magic(sc->sc_tty->t_dev, 1714 put[0], plcom_cnm_state); 1715 if (cn_trapped) { 1716 fr = bus_space_read_1(iot, ioh, 1717 plcom_fr); 1718 if (ISSET(fr, PL01X_FR_RXFE)) 1719 break; 1720 1721 continue; 1722 } 1723 put += 2; 1724 if (put >= end) 1725 put = sc->sc_rbuf; 1726 cc--; 1727 1728 fr = bus_space_read_1(iot, ioh, plcom_fr); 1729 if (ISSET(fr, PL01X_FR_RXFE)) 1730 break; 1731 } 1732 1733 /* 1734 * Current string of incoming characters ended because 1735 * no more data was available or we ran out of space. 1736 * Schedule a receive event if any data was received. 1737 * If we're out of space, turn off receive interrupts. 1738 */ 1739 sc->sc_rbput = put; 1740 sc->sc_rbavail = cc; 1741 if (!ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) 1742 sc->sc_rx_ready = 1; 1743 1744 /* 1745 * See if we are in danger of overflowing a buffer. If 1746 * so, use hardware flow control to ease the pressure. 1747 */ 1748 if (!ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED) && 1749 cc < sc->sc_r_hiwat) { 1750 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1751 plcom_hwiflow(sc); 1752 } 1753 1754 /* 1755 * If we're out of space, disable receive interrupts 1756 * until the queue has drained a bit. 1757 */ 1758 if (!cc) { 1759 SET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1760 CLR(sc->sc_cr, PL010_CR_RIE | PL010_CR_RTIE); 1761 bus_space_write_1(iot, ioh, plcom_cr, 1762 sc->sc_cr); 1763 } 1764 } else { 1765 if (ISSET(iir, PL010_IIR_RIS)) { 1766 bus_space_write_1(iot, ioh, plcom_cr, 0); 1767 delay(10); 1768 bus_space_write_1(iot, ioh, plcom_cr, 1769 sc->sc_cr); 1770 continue; 1771 } 1772 } 1773 1774 msr = bus_space_read_1(iot, ioh, plcom_fr); 1775 delta = msr ^ sc->sc_msr; 1776 sc->sc_msr = msr; 1777 /* Clear any pending modem status interrupt. */ 1778 if (iir & PL010_IIR_MIS) 1779 bus_space_write_1(iot, ioh, plcom_icr, 0); 1780 /* 1781 * Pulse-per-second (PSS) signals on edge of DCD? 1782 * Process these even if line discipline is ignoring DCD. 1783 */ 1784 if (delta & sc->sc_ppsmask) { 1785 struct timeval tv; 1786 mutex_spin_enter(&timecounter_lock); 1787 if ((msr & sc->sc_ppsmask) == sc->sc_ppsassert) { 1788 /* XXX nanotime() */ 1789 microtime(&tv); 1790 TIMEVAL_TO_TIMESPEC(&tv, 1791 &sc->ppsinfo.assert_timestamp); 1792 if (sc->ppsparam.mode & PPS_OFFSETASSERT) { 1793 timespecadd(&sc->ppsinfo.assert_timestamp, 1794 &sc->ppsparam.assert_offset, 1795 &sc->ppsinfo.assert_timestamp); 1796 } 1797 1798 #ifdef PPS_SYNC 1799 if (sc->ppsparam.mode & PPS_HARDPPSONASSERT) 1800 hardpps(&tv, tv.tv_usec); 1801 #endif 1802 sc->ppsinfo.assert_sequence++; 1803 sc->ppsinfo.current_mode = sc->ppsparam.mode; 1804 1805 } else if ((msr & sc->sc_ppsmask) == sc->sc_ppsclear) { 1806 /* XXX nanotime() */ 1807 microtime(&tv); 1808 TIMEVAL_TO_TIMESPEC(&tv, 1809 &sc->ppsinfo.clear_timestamp); 1810 if (sc->ppsparam.mode & PPS_OFFSETCLEAR) { 1811 timespecadd(&sc->ppsinfo.clear_timestamp, 1812 &sc->ppsparam.clear_offset, 1813 &sc->ppsinfo.clear_timestamp); 1814 } 1815 1816 #ifdef PPS_SYNC 1817 if (sc->ppsparam.mode & PPS_HARDPPSONCLEAR) 1818 hardpps(&tv, tv.tv_usec); 1819 #endif 1820 sc->ppsinfo.clear_sequence++; 1821 sc->ppsinfo.current_mode = sc->ppsparam.mode; 1822 } 1823 mutex_spin_exit(&timecounter_lock); 1824 } 1825 1826 /* 1827 * Process normal status changes 1828 */ 1829 if (ISSET(delta, sc->sc_msr_mask)) { 1830 SET(sc->sc_msr_delta, delta); 1831 1832 /* 1833 * Stop output immediately if we lose the output 1834 * flow control signal or carrier detect. 1835 */ 1836 if (ISSET(~msr, sc->sc_msr_mask)) { 1837 sc->sc_tbc = 0; 1838 sc->sc_heldtbc = 0; 1839 #ifdef PLCOM_DEBUG 1840 if (plcom_debug) 1841 plcomstatus(sc, "plcomintr "); 1842 #endif 1843 } 1844 1845 sc->sc_st_check = 1; 1846 } 1847 1848 /* 1849 * Done handling any receive interrupts. See if data 1850 * can be * transmitted as well. Schedule tx done 1851 * event if no data left * and tty was marked busy. 1852 */ 1853 if (ISSET(iir, PL010_IIR_TIS)) { 1854 /* 1855 * If we've delayed a parameter change, do it 1856 * now, and restart * output. 1857 */ 1858 if (sc->sc_heldchange) { 1859 plcom_loadchannelregs(sc); 1860 sc->sc_heldchange = 0; 1861 sc->sc_tbc = sc->sc_heldtbc; 1862 sc->sc_heldtbc = 0; 1863 } 1864 1865 /* 1866 * Output the next chunk of the contiguous 1867 * buffer, if any. 1868 */ 1869 if (sc->sc_tbc > 0) { 1870 int n; 1871 1872 n = sc->sc_tbc; 1873 if (n > sc->sc_fifolen) 1874 n = sc->sc_fifolen; 1875 bus_space_write_multi_1(iot, ioh, plcom_dr, 1876 sc->sc_tba, n); 1877 sc->sc_tbc -= n; 1878 sc->sc_tba += n; 1879 } else { 1880 /* 1881 * Disable transmit plcompletion 1882 * interrupts if necessary. 1883 */ 1884 if (ISSET(sc->sc_cr, PL010_CR_TIE)) { 1885 CLR(sc->sc_cr, PL010_CR_TIE); 1886 bus_space_write_1(iot, ioh, plcom_cr, 1887 sc->sc_cr); 1888 } 1889 if (sc->sc_tx_busy) { 1890 sc->sc_tx_busy = 0; 1891 sc->sc_tx_done = 1; 1892 } 1893 } 1894 } 1895 } while (ISSET((iir = bus_space_read_1(iot, ioh, plcom_iir)), 1896 PL010_IIR_IMASK)); 1897 1898 mutex_spin_exit(&sc->sc_lock); 1899 1900 /* Wake up the poller. */ 1901 softint_schedule(sc->sc_si); 1902 1903 #ifdef RND_COM 1904 rnd_add_uint32(&sc->rnd_source, iir | rsr); 1905 #endif 1906 1907 return 1; 1908 } 1909 1910 /* 1911 * The following functions are polled getc and putc routines, shared 1912 * by the console and kgdb glue. 1913 * 1914 * The read-ahead code is so that you can detect pending in-band 1915 * cn_magic in polled mode while doing output rather than having to 1916 * wait until the kernel decides it needs input. 1917 */ 1918 1919 #define MAX_READAHEAD 20 1920 static int plcom_readahead[MAX_READAHEAD]; 1921 static int plcom_readaheadcount = 0; 1922 1923 int 1924 plcom_common_getc(dev_t dev, bus_space_tag_t iot, bus_space_handle_t ioh) 1925 { 1926 int s = splserial(); 1927 u_char stat, c; 1928 1929 /* got a character from reading things earlier */ 1930 if (plcom_readaheadcount > 0) { 1931 int i; 1932 1933 c = plcom_readahead[0]; 1934 for (i = 1; i < plcom_readaheadcount; i++) { 1935 plcom_readahead[i-1] = plcom_readahead[i]; 1936 } 1937 plcom_readaheadcount--; 1938 splx(s); 1939 return c; 1940 } 1941 1942 /* block until a character becomes available */ 1943 while (ISSET(stat = bus_space_read_1(iot, ioh, plcom_fr), PL01X_FR_RXFE)) 1944 ; 1945 1946 c = bus_space_read_1(iot, ioh, plcom_dr); 1947 stat = bus_space_read_1(iot, ioh, plcom_iir); 1948 { 1949 int cn_trapped = 0; /* unused */ 1950 #ifdef DDB 1951 extern int db_active; 1952 if (!db_active) 1953 #endif 1954 cn_check_magic(dev, c, plcom_cnm_state); 1955 } 1956 splx(s); 1957 return c; 1958 } 1959 1960 void 1961 plcom_common_putc(dev_t dev, bus_space_tag_t iot, bus_space_handle_t ioh, 1962 int c) 1963 { 1964 int s = splserial(); 1965 int timo; 1966 1967 int cin, stat; 1968 if (plcom_readaheadcount < MAX_READAHEAD 1969 && !ISSET(stat = bus_space_read_1(iot, ioh, plcom_fr), PL01X_FR_RXFE)) { 1970 int cn_trapped = 0; 1971 cin = bus_space_read_1(iot, ioh, plcom_dr); 1972 stat = bus_space_read_1(iot, ioh, plcom_iir); 1973 cn_check_magic(dev, cin, plcom_cnm_state); 1974 plcom_readahead[plcom_readaheadcount++] = cin; 1975 } 1976 1977 /* wait for any pending transmission to finish */ 1978 timo = 150000; 1979 while (!ISSET(bus_space_read_1(iot, ioh, plcom_fr), PL01X_FR_TXFE) && --timo) 1980 continue; 1981 1982 bus_space_write_1(iot, ioh, plcom_dr, c); 1983 PLCOM_BARRIER(iot, ioh, BR | BW); 1984 1985 /* wait for this transmission to complete */ 1986 timo = 1500000; 1987 while (!ISSET(bus_space_read_1(iot, ioh, plcom_fr), PL01X_FR_TXFE) && --timo) 1988 continue; 1989 1990 splx(s); 1991 } 1992 1993 /* 1994 * Initialize UART for use as console or KGDB line. 1995 */ 1996 int 1997 plcominit(bus_space_tag_t iot, bus_addr_t iobase, int rate, int frequency, 1998 tcflag_t cflag, bus_space_handle_t *iohp) 1999 { 2000 bus_space_handle_t ioh; 2001 2002 if (bus_space_map(iot, iobase, PLCOM_UART_SIZE, 0, &ioh)) 2003 return ENOMEM; /* ??? */ 2004 2005 rate = plcomspeed(rate, frequency); 2006 bus_space_write_1(iot, ioh, plcom_cr, 0); 2007 bus_space_write_1(iot, ioh, plcom_dlbl, rate); 2008 bus_space_write_1(iot, ioh, plcom_dlbh, rate >> 8); 2009 bus_space_write_1(iot, ioh, plcom_lcr, cflag2lcr(cflag) | PL01X_LCR_FEN); 2010 bus_space_write_1(iot, ioh, plcom_cr, PL01X_CR_UARTEN); 2011 2012 #if 0 2013 /* Ought to do something like this, but we have no sc to 2014 dereference. */ 2015 /* XXX device_unit() abuse */ 2016 sc->sc_set_mcr(sc->sc_set_mcr_arg, device_unit(&sc->sc_dev), 2017 PL01X_MCR_DTR | PL01X_MCR_RTS); 2018 #endif 2019 2020 *iohp = ioh; 2021 return 0; 2022 } 2023 2024 /* 2025 * Following are all routines needed for PLCOM to act as console 2026 */ 2027 struct consdev plcomcons = { 2028 NULL, NULL, plcomcngetc, plcomcnputc, plcomcnpollc, NULL, 2029 NULL, NULL, NODEV, CN_NORMAL 2030 }; 2031 2032 2033 int 2034 plcomcnattach(bus_space_tag_t iot, bus_addr_t iobase, int rate, int frequency, 2035 tcflag_t cflag, int unit) 2036 { 2037 int res; 2038 2039 res = plcominit(iot, iobase, rate, frequency, cflag, &plcomconsioh); 2040 if (res) 2041 return res; 2042 2043 cn_tab = &plcomcons; 2044 cn_init_magic(&plcom_cnm_state); 2045 cn_set_magic("\047\001"); /* default magic is BREAK */ 2046 2047 plcomconstag = iot; 2048 plcomconsunit = unit; 2049 plcomconsrate = rate; 2050 plcomconscflag = cflag; 2051 2052 return 0; 2053 } 2054 2055 void 2056 plcomcndetach(void) 2057 { 2058 bus_space_unmap(plcomconstag, plcomconsioh, PLCOM_UART_SIZE); 2059 plcomconstag = NULL; 2060 2061 cn_tab = NULL; 2062 } 2063 2064 int 2065 plcomcngetc(dev_t dev) 2066 { 2067 return plcom_common_getc(dev, plcomconstag, plcomconsioh); 2068 } 2069 2070 /* 2071 * Console kernel output character routine. 2072 */ 2073 void 2074 plcomcnputc(dev_t dev, int c) 2075 { 2076 plcom_common_putc(dev, plcomconstag, plcomconsioh, c); 2077 } 2078 2079 void 2080 plcomcnpollc(dev_t dev, int on) 2081 { 2082 2083 } 2084 2085 #ifdef KGDB 2086 int 2087 plcom_kgdb_attach(bus_space_tag_t iot, bus_addr_t iobase, int rate, 2088 int frequency, tcflag_t cflag, int unit) 2089 { 2090 int res; 2091 2092 if (iot == plcomconstag && iobase == plcomconsunit) 2093 return EBUSY; /* cannot share with console */ 2094 2095 res = plcominit(iot, iobase, rate, frequency, cflag, &plcom_kgdb_ioh); 2096 if (res) 2097 return res; 2098 2099 kgdb_attach(plcom_kgdb_getc, plcom_kgdb_putc, NULL); 2100 kgdb_dev = 123; /* unneeded, only to satisfy some tests */ 2101 2102 plcom_kgdb_iot = iot; 2103 plcom_kgdb_unit = unit; 2104 2105 return 0; 2106 } 2107 2108 /* ARGSUSED */ 2109 int 2110 plcom_kgdb_getc(void *arg) 2111 { 2112 return plcom_common_getc(NODEV, plcom_kgdb_iot, plcom_kgdb_ioh); 2113 } 2114 2115 /* ARGSUSED */ 2116 void 2117 plcom_kgdb_putc(void *arg, int c) 2118 { 2119 plcom_common_putc(NODEV, plcom_kgdb_iot, plcom_kgdb_ioh, c); 2120 } 2121 #endif /* KGDB */ 2122 2123 /* helper function to identify the plcom ports used by 2124 console or KGDB (and not yet autoconf attached) */ 2125 int 2126 plcom_is_console(bus_space_tag_t iot, int unit, 2127 bus_space_handle_t *ioh) 2128 { 2129 bus_space_handle_t help; 2130 2131 if (!plcomconsattached && 2132 iot == plcomconstag && unit == plcomconsunit) 2133 help = plcomconsioh; 2134 #ifdef KGDB 2135 else if (!plcom_kgdb_attached && 2136 iot == plcom_kgdb_iot && unit == plcom_kgdb_unit) 2137 help = plcom_kgdb_ioh; 2138 #endif 2139 else 2140 return 0; 2141 2142 if (ioh) 2143 *ioh = help; 2144 return 1; 2145 } 2146
Indexes created Sun Oct 19 16:10:00 GMT 2025