sscom.c revision 1.46
1 /* $NetBSD: sscom.c,v 1.46 2014/08/10 16:44:33 tls Exp $ */ 2 3 /* 4 * Copyright (c) 2002, 2003 Fujitsu Component Limited 5 * Copyright (c) 2002, 2003 Genetec Corporation 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of The Fujitsu Component Limited nor the name of 17 * Genetec corporation may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY FUJITSU COMPONENT LIMITED AND GENETEC 21 * CORPORATION ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, 22 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 23 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 24 * DISCLAIMED. IN NO EVENT SHALL FUJITSU COMPONENT LIMITED OR GENETEC 25 * CORPORATION BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 27 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 28 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 29 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 /*- 36 * Copyright (c) 1998, 1999 The NetBSD Foundation, Inc. 37 * All rights reserved. 38 * 39 * This code is derived from software contributed to The NetBSD Foundation 40 * by Charles M. Hannum. 41 * 42 * Redistribution and use in source and binary forms, with or without 43 * modification, are permitted provided that the following conditions 44 * are met: 45 * 1. Redistributions of source code must retain the above copyright 46 * notice, this list of conditions and the following disclaimer. 47 * 2. Redistributions in binary form must reproduce the above copyright 48 * notice, this list of conditions and the following disclaimer in the 49 * documentation and/or other materials provided with the distribution. 50 * 51 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 52 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 53 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 54 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 55 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 56 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 57 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 58 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 59 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 60 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 61 * POSSIBILITY OF SUCH DAMAGE. 62 */ 63 64 /* 65 * Copyright (c) 1991 The Regents of the University of California. 66 * All rights reserved. 67 * 68 * Redistribution and use in source and binary forms, with or without 69 * modification, are permitted provided that the following conditions 70 * are met: 71 * 1. Redistributions of source code must retain the above copyright 72 * notice, this list of conditions and the following disclaimer. 73 * 2. Redistributions in binary form must reproduce the above copyright 74 * notice, this list of conditions and the following disclaimer in the 75 * documentation and/or other materials provided with the distribution. 76 * 3. Neither the name of the University nor the names of its contributors 77 * may be used to endorse or promote products derived from this software 78 * without specific prior written permission. 79 * 80 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 81 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 82 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 83 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 84 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 85 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 86 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 87 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 88 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 89 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 90 * SUCH DAMAGE. 91 * 92 * @(#)com.c 7.5 (Berkeley) 5/16/91 93 */ 94 95 /* 96 * Support integrated UARTs of Samsung S3C2800/2400X/2410X 97 * Derived from sys/dev/ic/com.c 98 */ 99 100 #include <sys/cdefs.h> 101 __KERNEL_RCSID(0, "$NetBSD: sscom.c,v 1.46 2014/08/10 16:44:33 tls Exp $"); 102 103 #include "opt_sscom.h" 104 #include "opt_ddb.h" 105 #include "opt_kgdb.h" 106 #include "opt_multiprocessor.h" 107 #include "opt_lockdebug.h" 108 109 #include "rnd.h" 110 #ifdef RND_COM 111 #include <sys/rnd.h> 112 #endif 113 114 /* 115 * Override cnmagic(9) macro before including <sys/systm.h>. 116 * We need to know if cn_check_magic triggered debugger, so set a flag. 117 * Callers of cn_check_magic must declare int cn_trapped = 0; 118 * XXX: this is *ugly*! 119 */ 120 #define cn_trap() \ 121 do { \ 122 console_debugger(); \ 123 cn_trapped = 1; \ 124 } while (/* CONSTCOND */ 0) 125 126 #include <sys/param.h> 127 #include <sys/systm.h> 128 #include <sys/ioctl.h> 129 #include <sys/select.h> 130 #include <sys/tty.h> 131 #include <sys/proc.h> 132 #include <sys/conf.h> 133 #include <sys/file.h> 134 #include <sys/uio.h> 135 #include <sys/kernel.h> 136 #include <sys/syslog.h> 137 #include <sys/types.h> 138 #include <sys/device.h> 139 #include <sys/malloc.h> 140 #include <sys/timepps.h> 141 #include <sys/vnode.h> 142 #include <sys/kauth.h> 143 #include <sys/intr.h> 144 #include <sys/bus.h> 145 #include <sys/mutex.h> 146 147 #include <arm/s3c2xx0/s3c2xx0reg.h> 148 #include <arm/s3c2xx0/sscom_var.h> 149 #include <dev/cons.h> 150 151 dev_type_open(sscomopen); 152 dev_type_close(sscomclose); 153 dev_type_read(sscomread); 154 dev_type_write(sscomwrite); 155 dev_type_ioctl(sscomioctl); 156 dev_type_stop(sscomstop); 157 dev_type_tty(sscomtty); 158 dev_type_poll(sscompoll); 159 160 int sscomcngetc (dev_t); 161 void sscomcnputc (dev_t, int); 162 void sscomcnpollc (dev_t, int); 163 164 #define integrate static inline 165 void sscomsoft (void *); 166 167 integrate void sscom_rxsoft (struct sscom_softc *, struct tty *); 168 integrate void sscom_txsoft (struct sscom_softc *, struct tty *); 169 integrate void sscom_stsoft (struct sscom_softc *, struct tty *); 170 integrate void sscom_schedrx (struct sscom_softc *); 171 static void sscom_modem(struct sscom_softc *, int); 172 static void sscom_break(struct sscom_softc *, int); 173 static void sscom_iflush(struct sscom_softc *); 174 static void sscom_hwiflow(struct sscom_softc *); 175 static void sscom_loadchannelregs(struct sscom_softc *); 176 static void tiocm_to_sscom(struct sscom_softc *, u_long, int); 177 static int sscom_to_tiocm(struct sscom_softc *); 178 static void tiocm_to_sscom(struct sscom_softc *, u_long, int); 179 static int sscom_to_tiocm(struct sscom_softc *); 180 static void sscom_iflush(struct sscom_softc *); 181 182 static int sscomhwiflow(struct tty *tp, int block); 183 #if defined(KGDB) || defined(SSCOM0CONSOLE) || defined(SSCOM1CONSOLE) 184 static int sscom_init(bus_space_tag_t, const struct sscom_uart_info *, 185 int, int, tcflag_t, bus_space_handle_t *); 186 #endif 187 188 extern struct cfdriver sscom_cd; 189 190 const struct cdevsw sscom_cdevsw = { 191 .d_open = sscomopen, 192 .d_close = sscomclose, 193 .d_read = sscomread, 194 .d_write = sscomwrite, 195 .d_ioctl = sscomioctl, 196 .d_stop = sscomstop, 197 .d_tty = sscomtty, 198 .d_poll = sscompoll, 199 .d_mmap = nommap, 200 .d_kqfilter = ttykqfilter, 201 .d_discard = nodiscard, 202 .d_flag = D_TTY 203 }; 204 205 /* 206 * Make this an option variable one can patch. 207 * But be warned: this must be a power of 2! 208 */ 209 u_int sscom_rbuf_size = SSCOM_RING_SIZE; 210 211 /* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */ 212 u_int sscom_rbuf_hiwat = (SSCOM_RING_SIZE * 1) / 4; 213 u_int sscom_rbuf_lowat = (SSCOM_RING_SIZE * 3) / 4; 214 215 static int sscomconsunit = -1; 216 static bus_space_tag_t sscomconstag; 217 static bus_space_handle_t sscomconsioh; 218 static int sscomconsattached; 219 static int sscomconsrate; 220 static tcflag_t sscomconscflag; 221 static struct cnm_state sscom_cnm_state; 222 223 #ifdef KGDB 224 #include <sys/kgdb.h> 225 226 static int sscom_kgdb_unit = -1; 227 static bus_space_tag_t sscom_kgdb_iot; 228 static bus_space_handle_t sscom_kgdb_ioh; 229 static int sscom_kgdb_attached; 230 231 int sscom_kgdb_getc (void *); 232 void sscom_kgdb_putc (void *, int); 233 #endif /* KGDB */ 234 235 #define SSCOMUNIT_MASK 0x7f 236 #define SSCOMDIALOUT_MASK 0x80 237 238 #define SSCOMUNIT(x) (minor(x) & SSCOMUNIT_MASK) 239 #define SSCOMDIALOUT(x) (minor(x) & SSCOMDIALOUT_MASK) 240 241 #if 0 242 #define SSCOM_ISALIVE(sc) ((sc)->enabled != 0 && \ 243 device_is_active(&(sc)->sc_dev)) 244 #else 245 #define SSCOM_ISALIVE(sc) device_is_active((sc)->sc_dev) 246 #endif 247 248 #define BR BUS_SPACE_BARRIER_READ 249 #define BW BUS_SPACE_BARRIER_WRITE 250 #define SSCOM_BARRIER(t, h, f) /* no-op */ 251 252 #if (defined(MULTIPROCESSOR) || defined(LOCKDEBUG)) && defined(SSCOM_MPLOCK) 253 254 #define SSCOM_LOCK(sc) mutex_enter((sc)->sc_lock) 255 #define SSCOM_UNLOCK(sc) mutex_exit((sc)->sc_lock) 256 257 #else 258 259 #define SSCOM_LOCK(sc) 260 #define SSCOM_UNLOCK(sc) 261 262 #endif 263 264 #ifndef SSCOM_TOLERANCE 265 #define SSCOM_TOLERANCE 30 /* XXX: baud rate tolerance, in 0.1% units */ 266 #endif 267 268 /* value for UCON */ 269 #define UCON_RXINT_MASK \ 270 (UCON_RXMODE_MASK|UCON_ERRINT|UCON_TOINT|UCON_RXINT_TYPE) 271 #define UCON_RXINT_ENABLE \ 272 (UCON_RXMODE_INT|UCON_ERRINT|UCON_TOINT|UCON_RXINT_TYPE_LEVEL) 273 #define UCON_TXINT_MASK (UCON_TXMODE_MASK|UCON_TXINT_TYPE) 274 #define UCON_TXINT_ENABLE (UCON_TXMODE_INT|UCON_TXINT_TYPE_LEVEL) 275 276 /* we don't want tx interrupt on debug port, but it is needed to 277 have transmitter active */ 278 #define UCON_DEBUGPORT (UCON_RXINT_ENABLE|UCON_TXINT_ENABLE) 279 280 281 static inline void 282 __sscom_output_chunk(struct sscom_softc *sc, int ufstat) 283 { 284 int n, space; 285 bus_space_tag_t iot = sc->sc_iot; 286 bus_space_handle_t ioh = sc->sc_ioh; 287 288 n = sc->sc_tbc; 289 space = 16 - ((ufstat & UFSTAT_TXCOUNT) >> UFSTAT_TXCOUNT_SHIFT); 290 291 if (n > space) 292 n = space; 293 294 if (n > 0) { 295 bus_space_write_multi_1(iot, ioh, SSCOM_UTXH, sc->sc_tba, n); 296 sc->sc_tbc -= n; 297 sc->sc_tba += n; 298 } 299 } 300 301 static void 302 sscom_output_chunk(struct sscom_softc *sc) 303 { 304 int ufstat = bus_space_read_2(sc->sc_iot, sc->sc_ioh, SSCOM_UFSTAT); 305 306 if (!(ufstat & UFSTAT_TXFULL)) 307 __sscom_output_chunk(sc, ufstat); 308 } 309 310 int 311 sscomspeed(long speed, long frequency) 312 { 313 #define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */ 314 315 int x, err; 316 317 if (speed <= 0) 318 return -1; 319 x = divrnd(frequency / 16, speed); 320 if (x <= 0) 321 return -1; 322 err = divrnd(((quad_t)frequency) * 1000 / 16, speed * x) - 1000; 323 if (err < 0) 324 err = -err; 325 if (err > SSCOM_TOLERANCE) 326 return -1; 327 return x-1; 328 329 #undef divrnd 330 } 331 332 void sscomstatus (struct sscom_softc *, const char *); 333 334 #ifdef SSCOM_DEBUG 335 int sscom_debug = 0; 336 337 void 338 sscomstatus(struct sscom_softc *sc, const char *str) 339 { 340 struct tty *tp = sc->sc_tty; 341 int umstat = bus_space_read_1(sc->sc_iot, sc->sc_iot, SSCOM_UMSTAT); 342 int umcon = bus_space_read_1(sc->sc_iot, sc->sc_iot, SSCOM_UMCON); 343 344 printf("%s: %s %sclocal %sdcd %sts_carr_on %sdtr %stx_stopped\n", 345 device_xname(sc->sc_dev), str, 346 ISSET(tp->t_cflag, CLOCAL) ? "+" : "-", 347 "+", /* DCD */ 348 ISSET(tp->t_state, TS_CARR_ON) ? "+" : "-", 349 "+", /* DTR */ 350 sc->sc_tx_stopped ? "+" : "-"); 351 352 printf("%s: %s %scrtscts %scts %sts_ttstop %srts %xrx_flags\n", 353 device_xname(sc->sc_dev), str, 354 ISSET(tp->t_cflag, CRTSCTS) ? "+" : "-", 355 ISSET(umstat, UMSTAT_CTS) ? "+" : "-", 356 ISSET(tp->t_state, TS_TTSTOP) ? "+" : "-", 357 ISSET(umcon, UMCON_RTS) ? "+" : "-", 358 sc->sc_rx_flags); 359 } 360 #else 361 #define sscom_debug 0 362 #endif 363 364 static void 365 sscom_enable_debugport(struct sscom_softc *sc) 366 { 367 int s; 368 369 /* Turn on line break interrupt, set carrier. */ 370 s = splserial(); 371 SSCOM_LOCK(sc); 372 sc->sc_ucon = UCON_DEBUGPORT; 373 bus_space_write_2(sc->sc_iot, sc->sc_ioh, SSCOM_UCON, sc->sc_ucon); 374 sc->sc_umcon = UMCON_RTS|UMCON_DTR; 375 sc->sc_set_modem_control(sc); 376 sscom_enable_rxint(sc); 377 sscom_disable_txint(sc); 378 SSCOM_UNLOCK(sc); 379 splx(s); 380 } 381 382 static void 383 sscom_set_modem_control(struct sscom_softc *sc) 384 { 385 /* flob RTS */ 386 bus_space_write_1(sc->sc_iot, sc->sc_ioh, 387 SSCOM_UMCON, sc->sc_umcon & UMCON_HW_MASK); 388 /* ignore DTR */ 389 } 390 391 static int 392 sscom_read_modem_status(struct sscom_softc *sc) 393 { 394 int msts; 395 396 msts = bus_space_read_1(sc->sc_iot, sc->sc_ioh, SSCOM_UMSTAT); 397 398 /* DCD and DSR are always on */ 399 return (msts & UMSTAT_CTS) | MSTS_DCD | MSTS_DSR; 400 } 401 402 void 403 sscom_attach_subr(struct sscom_softc *sc) 404 { 405 int unit = sc->sc_unit; 406 bus_space_tag_t iot = sc->sc_iot; 407 bus_space_handle_t ioh = sc->sc_ioh; 408 struct tty *tp; 409 410 callout_init(&sc->sc_diag_callout, 0); 411 #if (defined(MULTIPROCESSOR) || defined(LOCKDEBUG)) && defined(SSCOM_MPLOCK) 412 sc->sc_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_SERIAL); 413 #endif 414 415 sc->sc_ucon = UCON_RXINT_ENABLE|UCON_TXINT_ENABLE; 416 417 /* 418 * set default for modem control hook 419 */ 420 if (sc->sc_set_modem_control == NULL) 421 sc->sc_set_modem_control = sscom_set_modem_control; 422 if (sc->sc_read_modem_status == NULL) 423 sc->sc_read_modem_status = sscom_read_modem_status; 424 425 /* Disable interrupts before configuring the device. */ 426 KASSERT(sc->sc_change_txrx_interrupts != NULL); 427 sscom_disable_txrxint(sc); 428 429 #ifdef KGDB 430 /* 431 * Allow kgdb to "take over" this port. If this is 432 * the kgdb device, it has exclusive use. 433 */ 434 if (unit == sscom_kgdb_unit) { 435 SET(sc->sc_hwflags, SSCOM_HW_KGDB); 436 sc->sc_ucon = UCON_DEBUGPORT; 437 } 438 #endif 439 440 if (unit == sscomconsunit) { 441 int timo, stat; 442 443 sscomconsattached = 1; 444 sscomconstag = iot; 445 sscomconsioh = ioh; 446 447 /* wait for this transmission to complete */ 448 timo = 1500000; 449 do { 450 stat = bus_space_read_1(iot, ioh, SSCOM_UTRSTAT); 451 } while ((stat & UTRSTAT_TXEMPTY) == 0 && --timo > 0); 452 453 /* Make sure the console is always "hardwired". */ 454 SET(sc->sc_hwflags, SSCOM_HW_CONSOLE); 455 SET(sc->sc_swflags, TIOCFLAG_SOFTCAR); 456 457 sc->sc_ucon = UCON_DEBUGPORT; 458 } 459 460 bus_space_write_1(iot, ioh, SSCOM_UFCON, 461 #ifdef SSCOM_S3C2440 462 UFCON_TXTRIGGER_16|UFCON_RXTRIGGER_16|UFCON_FIFO_ENABLE| 463 #else 464 UFCON_TXTRIGGER_8|UFCON_RXTRIGGER_8|UFCON_FIFO_ENABLE| 465 #endif 466 UFCON_TXFIFO_RESET|UFCON_RXFIFO_RESET); 467 468 bus_space_write_1(iot, ioh, SSCOM_UCON, sc->sc_ucon); 469 470 #ifdef KGDB 471 if (ISSET(sc->sc_hwflags, SSCOM_HW_KGDB)) { 472 sscom_kgdb_attached = 1; 473 printf("%s: kgdb\n", device_xname(sc->sc_dev)); 474 sscom_enable_debugport(sc); 475 return; 476 } 477 #endif 478 479 tp = tty_alloc(); 480 tp->t_oproc = sscomstart; 481 tp->t_param = sscomparam; 482 tp->t_hwiflow = sscomhwiflow; 483 484 sc->sc_tty = tp; 485 sc->sc_rbuf = malloc(sscom_rbuf_size << 1, M_DEVBUF, M_NOWAIT); 486 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 487 sc->sc_rbavail = sscom_rbuf_size; 488 if (sc->sc_rbuf == NULL) { 489 printf("%s: unable to allocate ring buffer\n", 490 device_xname(sc->sc_dev)); 491 return; 492 } 493 sc->sc_ebuf = sc->sc_rbuf + (sscom_rbuf_size << 1); 494 495 tty_attach(tp); 496 497 if (ISSET(sc->sc_hwflags, SSCOM_HW_CONSOLE)) { 498 int maj; 499 500 /* locate the major number */ 501 maj = cdevsw_lookup_major(&sscom_cdevsw); 502 503 cn_tab->cn_dev = makedev(maj, device_unit(sc->sc_dev)); 504 505 printf("%s: console (major=%d)\n", device_xname(sc->sc_dev), maj); 506 } 507 508 509 sc->sc_si = softint_establish(SOFTINT_SERIAL, sscomsoft, sc); 510 511 #ifdef RND_COM 512 rnd_attach_source(&sc->rnd_source, device_xname(sc->sc_dev), 513 RND_TYPE_TTY, RND_FLAG_COLLECT_TIME| 514 RND_FLAG_ESTIMATE_TIME); 515 #endif 516 517 /* if there are no enable/disable functions, assume the device 518 is always enabled */ 519 520 if (ISSET(sc->sc_hwflags, SSCOM_HW_CONSOLE)) 521 sscom_enable_debugport(sc); 522 else 523 sscom_disable_txrxint(sc); 524 525 SET(sc->sc_hwflags, SSCOM_HW_DEV_OK); 526 } 527 528 int 529 sscom_detach(device_t self, int flags) 530 { 531 struct sscom_softc *sc = device_private(self); 532 533 if (sc->sc_hwflags & (SSCOM_HW_CONSOLE|SSCOM_HW_KGDB)) 534 return EBUSY; 535 536 return 0; 537 } 538 539 int 540 sscom_activate(device_t self, enum devact act) 541 { 542 #ifdef notyet 543 struct sscom_softc *sc = device_private(self); 544 #endif 545 546 switch (act) { 547 case DVACT_DEACTIVATE: 548 #ifdef notyet 549 sc->enabled = 0; 550 #endif 551 return 0; 552 default: 553 return EOPNOTSUPP; 554 } 555 } 556 557 void 558 sscom_shutdown(struct sscom_softc *sc) 559 { 560 #ifdef notyet 561 struct tty *tp = sc->sc_tty; 562 int s; 563 564 s = splserial(); 565 SSCOM_LOCK(sc); 566 567 /* If we were asserting flow control, then deassert it. */ 568 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 569 sscom_hwiflow(sc); 570 571 /* Clear any break condition set with TIOCSBRK. */ 572 sscom_break(sc, 0); 573 574 /* 575 * Hang up if necessary. Wait a bit, so the other side has time to 576 * notice even if we immediately open the port again. 577 * Avoid tsleeping above splhigh(). 578 */ 579 if (ISSET(tp->t_cflag, HUPCL)) { 580 sscom_modem(sc, 0); 581 SSCOM_UNLOCK(sc); 582 splx(s); 583 /* XXX tsleep will only timeout */ 584 (void) tsleep(sc, TTIPRI, ttclos, hz); 585 s = splserial(); 586 SSCOM_LOCK(sc); 587 } 588 589 if (ISSET(sc->sc_hwflags, SSCOM_HW_CONSOLE)) 590 /* interrupt on break */ 591 sc->sc_ucon = UCON_DEBUGPORT; 592 else 593 sc->sc_ucon = 0; 594 bus_space_write_2(sc->sc_iot, sc->sc_ioh, SSCOM_UCON, sc->sc_ucon); 595 596 #ifdef DIAGNOSTIC 597 if (!sc->enabled) 598 panic("sscom_shutdown: not enabled?"); 599 #endif 600 sc->enabled = 0; 601 SSCOM_UNLOCK(sc); 602 splx(s); 603 #endif 604 } 605 606 int 607 sscomopen(dev_t dev, int flag, int mode, struct lwp *l) 608 { 609 struct sscom_softc *sc; 610 struct tty *tp; 611 int s, s2; 612 int error; 613 614 sc = device_lookup_private(&sscom_cd, SSCOMUNIT(dev)); 615 if (sc == NULL || !ISSET(sc->sc_hwflags, SSCOM_HW_DEV_OK) || 616 sc->sc_rbuf == NULL) 617 return ENXIO; 618 619 if (!device_is_active(sc->sc_dev)) 620 return ENXIO; 621 622 #ifdef KGDB 623 /* 624 * If this is the kgdb port, no other use is permitted. 625 */ 626 if (ISSET(sc->sc_hwflags, SSCOM_HW_KGDB)) 627 return EBUSY; 628 #endif 629 630 tp = sc->sc_tty; 631 632 if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp)) 633 return (EBUSY); 634 635 s = spltty(); 636 637 /* 638 * Do the following iff this is a first open. 639 */ 640 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 641 struct termios t; 642 643 tp->t_dev = dev; 644 645 s2 = splserial(); 646 SSCOM_LOCK(sc); 647 648 /* Turn on interrupts. */ 649 sscom_enable_txrxint(sc); 650 651 /* Fetch the current modem control status, needed later. */ 652 sc->sc_msts = sc->sc_read_modem_status(sc); 653 654 #if 0 655 /* Clear PPS capture state on first open. */ 656 sc->sc_ppsmask = 0; 657 sc->ppsparam.mode = 0; 658 #endif 659 660 SSCOM_UNLOCK(sc); 661 splx(s2); 662 663 /* 664 * Initialize the termios status to the defaults. Add in the 665 * sticky bits from TIOCSFLAGS. 666 */ 667 t.c_ispeed = 0; 668 if (ISSET(sc->sc_hwflags, SSCOM_HW_CONSOLE)) { 669 t.c_ospeed = sscomconsrate; 670 t.c_cflag = sscomconscflag; 671 } else { 672 t.c_ospeed = TTYDEF_SPEED; 673 t.c_cflag = TTYDEF_CFLAG; 674 } 675 if (ISSET(sc->sc_swflags, TIOCFLAG_CLOCAL)) 676 SET(t.c_cflag, CLOCAL); 677 if (ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS)) 678 SET(t.c_cflag, CRTSCTS); 679 if (ISSET(sc->sc_swflags, TIOCFLAG_MDMBUF)) 680 SET(t.c_cflag, MDMBUF); 681 /* Make sure sscomparam() will do something. */ 682 tp->t_ospeed = 0; 683 (void) sscomparam(tp, &t); 684 tp->t_iflag = TTYDEF_IFLAG; 685 tp->t_oflag = TTYDEF_OFLAG; 686 tp->t_lflag = TTYDEF_LFLAG; 687 ttychars(tp); 688 ttsetwater(tp); 689 690 s2 = splserial(); 691 SSCOM_LOCK(sc); 692 693 /* 694 * Turn on DTR. We must always do this, even if carrier is not 695 * present, because otherwise we'd have to use TIOCSDTR 696 * immediately after setting CLOCAL, which applications do not 697 * expect. We always assert DTR while the device is open 698 * unless explicitly requested to deassert it. 699 */ 700 sscom_modem(sc, 1); 701 702 /* Clear the input ring, and unblock. */ 703 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 704 sc->sc_rbavail = sscom_rbuf_size; 705 sscom_iflush(sc); 706 CLR(sc->sc_rx_flags, RX_ANY_BLOCK); 707 sscom_hwiflow(sc); 708 709 if (sscom_debug) 710 sscomstatus(sc, "sscomopen "); 711 712 SSCOM_UNLOCK(sc); 713 splx(s2); 714 } 715 716 splx(s); 717 718 error = ttyopen(tp, SSCOMDIALOUT(dev), ISSET(flag, O_NONBLOCK)); 719 if (error) 720 goto bad; 721 722 error = (*tp->t_linesw->l_open)(dev, tp); 723 if (error) 724 goto bad; 725 726 return 0; 727 728 bad: 729 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 730 /* 731 * We failed to open the device, and nobody else had it opened. 732 * Clean up the state as appropriate. 733 */ 734 sscom_shutdown(sc); 735 } 736 737 return error; 738 } 739 740 int 741 sscomclose(dev_t dev, int flag, int mode, struct lwp *l) 742 { 743 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(dev)); 744 struct tty *tp = sc->sc_tty; 745 746 /* XXX This is for cons.c. */ 747 if (!ISSET(tp->t_state, TS_ISOPEN)) 748 return 0; 749 750 (*tp->t_linesw->l_close)(tp, flag); 751 ttyclose(tp); 752 753 if (SSCOM_ISALIVE(sc) == 0) 754 return 0; 755 756 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 757 /* 758 * Although we got a last close, the device may still be in 759 * use; e.g. if this was the dialout node, and there are still 760 * processes waiting for carrier on the non-dialout node. 761 */ 762 sscom_shutdown(sc); 763 } 764 765 return 0; 766 } 767 768 int 769 sscomread(dev_t dev, struct uio *uio, int flag) 770 { 771 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(dev)); 772 struct tty *tp = sc->sc_tty; 773 774 if (SSCOM_ISALIVE(sc) == 0) 775 return EIO; 776 777 return (*tp->t_linesw->l_read)(tp, uio, flag); 778 } 779 780 int 781 sscomwrite(dev_t dev, struct uio *uio, int flag) 782 { 783 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(dev)); 784 struct tty *tp = sc->sc_tty; 785 786 if (SSCOM_ISALIVE(sc) == 0) 787 return EIO; 788 789 return (*tp->t_linesw->l_write)(tp, uio, flag); 790 } 791 792 int 793 sscompoll(dev_t dev, int events, struct lwp *l) 794 { 795 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(dev)); 796 struct tty *tp = sc->sc_tty; 797 798 if (SSCOM_ISALIVE(sc) == 0) 799 return EIO; 800 801 return (*tp->t_linesw->l_poll)(tp, events, l); 802 } 803 804 struct tty * 805 sscomtty(dev_t dev) 806 { 807 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(dev)); 808 struct tty *tp = sc->sc_tty; 809 810 return tp; 811 } 812 813 int 814 sscomioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 815 { 816 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(dev)); 817 struct tty *tp = sc->sc_tty; 818 int error; 819 int s; 820 821 if (SSCOM_ISALIVE(sc) == 0) 822 return EIO; 823 824 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 825 if (error != EPASSTHROUGH) 826 return error; 827 828 error = ttioctl(tp, cmd, data, flag, l); 829 if (error != EPASSTHROUGH) 830 return error; 831 832 error = 0; 833 834 s = splserial(); 835 SSCOM_LOCK(sc); 836 837 switch (cmd) { 838 case TIOCSBRK: 839 sscom_break(sc, 1); 840 break; 841 842 case TIOCCBRK: 843 sscom_break(sc, 0); 844 break; 845 846 case TIOCSDTR: 847 sscom_modem(sc, 1); 848 break; 849 850 case TIOCCDTR: 851 sscom_modem(sc, 0); 852 break; 853 854 case TIOCGFLAGS: 855 *(int *)data = sc->sc_swflags; 856 break; 857 858 case TIOCSFLAGS: 859 error = kauth_authorize_device_tty(l->l_cred, 860 KAUTH_DEVICE_TTY_PRIVSET, tp); 861 if (error) 862 break; 863 sc->sc_swflags = *(int *)data; 864 break; 865 866 case TIOCMSET: 867 case TIOCMBIS: 868 case TIOCMBIC: 869 tiocm_to_sscom(sc, cmd, *(int *)data); 870 break; 871 872 case TIOCMGET: 873 *(int *)data = sscom_to_tiocm(sc); 874 break; 875 876 default: 877 error = EPASSTHROUGH; 878 break; 879 } 880 881 SSCOM_UNLOCK(sc); 882 splx(s); 883 884 if (sscom_debug) 885 sscomstatus(sc, "sscomioctl "); 886 887 return error; 888 } 889 890 integrate void 891 sscom_schedrx(struct sscom_softc *sc) 892 { 893 894 sc->sc_rx_ready = 1; 895 896 /* Wake up the poller. */ 897 softint_schedule(sc->sc_si); 898 } 899 900 static void 901 sscom_break(struct sscom_softc *sc, int onoff) 902 { 903 904 if (onoff) 905 SET(sc->sc_ucon, UCON_SBREAK); 906 else 907 CLR(sc->sc_ucon, UCON_SBREAK); 908 909 if (!sc->sc_heldchange) { 910 if (sc->sc_tx_busy) { 911 sc->sc_heldtbc = sc->sc_tbc; 912 sc->sc_tbc = 0; 913 sc->sc_heldchange = 1; 914 } else 915 sscom_loadchannelregs(sc); 916 } 917 } 918 919 static void 920 sscom_modem(struct sscom_softc *sc, int onoff) 921 { 922 if (onoff) 923 SET(sc->sc_umcon, UMCON_DTR); 924 else 925 CLR(sc->sc_umcon, UMCON_DTR); 926 927 if (!sc->sc_heldchange) { 928 if (sc->sc_tx_busy) { 929 sc->sc_heldtbc = sc->sc_tbc; 930 sc->sc_tbc = 0; 931 sc->sc_heldchange = 1; 932 } else 933 sscom_loadchannelregs(sc); 934 } 935 } 936 937 static void 938 tiocm_to_sscom(struct sscom_softc *sc, u_long how, int ttybits) 939 { 940 u_char sscombits; 941 942 sscombits = 0; 943 if (ISSET(ttybits, TIOCM_DTR)) 944 sscombits = UMCON_DTR; 945 if (ISSET(ttybits, TIOCM_RTS)) 946 SET(sscombits, UMCON_RTS); 947 948 switch (how) { 949 case TIOCMBIC: 950 CLR(sc->sc_umcon, sscombits); 951 break; 952 953 case TIOCMBIS: 954 SET(sc->sc_umcon, sscombits); 955 break; 956 957 case TIOCMSET: 958 CLR(sc->sc_umcon, UMCON_DTR); 959 SET(sc->sc_umcon, sscombits); 960 break; 961 } 962 963 if (!sc->sc_heldchange) { 964 if (sc->sc_tx_busy) { 965 sc->sc_heldtbc = sc->sc_tbc; 966 sc->sc_tbc = 0; 967 sc->sc_heldchange = 1; 968 } else 969 sscom_loadchannelregs(sc); 970 } 971 } 972 973 static int 974 sscom_to_tiocm(struct sscom_softc *sc) 975 { 976 u_char sscombits; 977 int ttybits = 0; 978 979 sscombits = sc->sc_umcon; 980 #if 0 981 if (ISSET(sscombits, MCR_DTR)) 982 SET(ttybits, TIOCM_DTR); 983 #endif 984 if (ISSET(sscombits, UMCON_RTS)) 985 SET(ttybits, TIOCM_RTS); 986 987 sscombits = sc->sc_msts; 988 if (ISSET(sscombits, MSTS_DCD)) 989 SET(ttybits, TIOCM_CD); 990 if (ISSET(sscombits, MSTS_DSR)) 991 SET(ttybits, TIOCM_DSR); 992 if (ISSET(sscombits, MSTS_CTS)) 993 SET(ttybits, TIOCM_CTS); 994 995 if (sc->sc_ucon != 0) 996 SET(ttybits, TIOCM_LE); 997 998 return ttybits; 999 } 1000 1001 static int 1002 cflag2lcr(tcflag_t cflag) 1003 { 1004 u_char lcr = ULCON_PARITY_NONE; 1005 1006 switch (cflag & (PARENB|PARODD)) { 1007 case PARENB|PARODD: lcr = ULCON_PARITY_ODD; break; 1008 case PARENB: lcr = ULCON_PARITY_EVEN; 1009 } 1010 1011 switch (ISSET(cflag, CSIZE)) { 1012 case CS5: 1013 SET(lcr, ULCON_LENGTH_5); 1014 break; 1015 case CS6: 1016 SET(lcr, ULCON_LENGTH_6); 1017 break; 1018 case CS7: 1019 SET(lcr, ULCON_LENGTH_7); 1020 break; 1021 case CS8: 1022 SET(lcr, ULCON_LENGTH_8); 1023 break; 1024 } 1025 if (ISSET(cflag, CSTOPB)) 1026 SET(lcr, ULCON_STOP); 1027 1028 return lcr; 1029 } 1030 1031 int 1032 sscomparam(struct tty *tp, struct termios *t) 1033 { 1034 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(tp->t_dev)); 1035 int ospeed; 1036 u_char lcr; 1037 int s; 1038 1039 if (SSCOM_ISALIVE(sc) == 0) 1040 return EIO; 1041 1042 ospeed = sscomspeed(t->c_ospeed, sc->sc_frequency); 1043 1044 /* Check requested parameters. */ 1045 if (ospeed < 0) 1046 return EINVAL; 1047 if (t->c_ispeed && t->c_ispeed != t->c_ospeed) 1048 return EINVAL; 1049 1050 /* 1051 * For the console, always force CLOCAL and !HUPCL, so that the port 1052 * is always active. 1053 */ 1054 if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) || 1055 ISSET(sc->sc_hwflags, SSCOM_HW_CONSOLE)) { 1056 SET(t->c_cflag, CLOCAL); 1057 CLR(t->c_cflag, HUPCL); 1058 } 1059 1060 /* 1061 * If there were no changes, don't do anything. This avoids dropping 1062 * input and improves performance when all we did was frob things like 1063 * VMIN and VTIME. 1064 */ 1065 if (tp->t_ospeed == t->c_ospeed && 1066 tp->t_cflag == t->c_cflag) 1067 return 0; 1068 1069 lcr = cflag2lcr(t->c_cflag); 1070 1071 s = splserial(); 1072 SSCOM_LOCK(sc); 1073 1074 sc->sc_ulcon = lcr; 1075 1076 /* 1077 * If we're not in a mode that assumes a connection is present, then 1078 * ignore carrier changes. 1079 */ 1080 if (ISSET(t->c_cflag, CLOCAL | MDMBUF)) 1081 sc->sc_msr_dcd = 0; 1082 else 1083 sc->sc_msr_dcd = MSTS_DCD; 1084 1085 /* 1086 * Set the flow control pins depending on the current flow control 1087 * mode. 1088 */ 1089 if (ISSET(t->c_cflag, CRTSCTS)) { 1090 sc->sc_mcr_dtr = UMCON_DTR; 1091 sc->sc_mcr_rts = UMCON_RTS; 1092 sc->sc_msr_cts = MSTS_CTS; 1093 } 1094 else if (ISSET(t->c_cflag, MDMBUF)) { 1095 /* 1096 * For DTR/DCD flow control, make sure we don't toggle DTR for 1097 * carrier detection. 1098 */ 1099 sc->sc_mcr_dtr = 0; 1100 sc->sc_mcr_rts = UMCON_DTR; 1101 sc->sc_msr_cts = MSTS_DCD; 1102 } 1103 else { 1104 /* 1105 * If no flow control, then always set RTS. This will make 1106 * the other side happy if it mistakenly thinks we're doing 1107 * RTS/CTS flow control. 1108 */ 1109 sc->sc_mcr_dtr = UMCON_DTR | UMCON_RTS; 1110 sc->sc_mcr_rts = 0; 1111 sc->sc_msr_cts = 0; 1112 if (ISSET(sc->sc_umcon, UMCON_DTR)) 1113 SET(sc->sc_umcon, UMCON_RTS); 1114 else 1115 CLR(sc->sc_umcon, UMCON_RTS); 1116 } 1117 sc->sc_msr_mask = sc->sc_msr_cts | sc->sc_msr_dcd; 1118 1119 if (ospeed == 0) 1120 CLR(sc->sc_umcon, sc->sc_mcr_dtr); 1121 else 1122 SET(sc->sc_umcon, sc->sc_mcr_dtr); 1123 1124 sc->sc_ubrdiv = ospeed; 1125 1126 /* And copy to tty. */ 1127 tp->t_ispeed = 0; 1128 tp->t_ospeed = t->c_ospeed; 1129 tp->t_cflag = t->c_cflag; 1130 1131 if (!sc->sc_heldchange) { 1132 if (sc->sc_tx_busy) { 1133 sc->sc_heldtbc = sc->sc_tbc; 1134 sc->sc_tbc = 0; 1135 sc->sc_heldchange = 1; 1136 } else 1137 sscom_loadchannelregs(sc); 1138 } 1139 1140 if (!ISSET(t->c_cflag, CHWFLOW)) { 1141 /* Disable the high water mark. */ 1142 sc->sc_r_hiwat = 0; 1143 sc->sc_r_lowat = 0; 1144 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1145 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1146 sscom_schedrx(sc); 1147 } 1148 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 1149 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 1150 sscom_hwiflow(sc); 1151 } 1152 } else { 1153 sc->sc_r_hiwat = sscom_rbuf_hiwat; 1154 sc->sc_r_lowat = sscom_rbuf_lowat; 1155 } 1156 1157 SSCOM_UNLOCK(sc); 1158 splx(s); 1159 1160 /* 1161 * Update the tty layer's idea of the carrier bit, in case we changed 1162 * CLOCAL or MDMBUF. We don't hang up here; we only do that by 1163 * explicit request. 1164 */ 1165 (void) (*tp->t_linesw->l_modem)(tp, ISSET(sc->sc_msts, MSTS_DCD)); 1166 1167 if (sscom_debug) 1168 sscomstatus(sc, "sscomparam "); 1169 1170 if (!ISSET(t->c_cflag, CHWFLOW)) { 1171 if (sc->sc_tx_stopped) { 1172 sc->sc_tx_stopped = 0; 1173 sscomstart(tp); 1174 } 1175 } 1176 1177 return 0; 1178 } 1179 1180 static void 1181 sscom_iflush(struct sscom_softc *sc) 1182 { 1183 bus_space_tag_t iot = sc->sc_iot; 1184 bus_space_handle_t ioh = sc->sc_ioh; 1185 int timo; 1186 1187 1188 timo = 50000; 1189 /* flush any pending I/O */ 1190 while ( sscom_rxrdy(iot, ioh) && --timo) 1191 (void)sscom_getc(iot,ioh); 1192 #ifdef DIAGNOSTIC 1193 if (!timo) 1194 printf("%s: sscom_iflush timeout\n", device_xname(sc->sc_dev)); 1195 #endif 1196 } 1197 1198 static void 1199 sscom_loadchannelregs(struct sscom_softc *sc) 1200 { 1201 bus_space_tag_t iot = sc->sc_iot; 1202 bus_space_handle_t ioh = sc->sc_ioh; 1203 1204 /* XXXXX necessary? */ 1205 sscom_iflush(sc); 1206 1207 bus_space_write_2(iot, ioh, SSCOM_UCON, 0); 1208 1209 #if 0 1210 if (ISSET(sc->sc_hwflags, COM_HW_FLOW)) { 1211 bus_space_write_1(iot, ioh, com_lcr, LCR_EERS); 1212 bus_space_write_1(iot, ioh, com_efr, sc->sc_efr); 1213 } 1214 #endif 1215 1216 bus_space_write_2(iot, ioh, SSCOM_UBRDIV, sc->sc_ubrdiv); 1217 bus_space_write_1(iot, ioh, SSCOM_ULCON, sc->sc_ulcon); 1218 sc->sc_set_modem_control(sc); 1219 bus_space_write_2(iot, ioh, SSCOM_UCON, sc->sc_ucon); 1220 } 1221 1222 static int 1223 sscomhwiflow(struct tty *tp, int block) 1224 { 1225 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(tp->t_dev)); 1226 int s; 1227 1228 if (SSCOM_ISALIVE(sc) == 0) 1229 return 0; 1230 1231 if (sc->sc_mcr_rts == 0) 1232 return 0; 1233 1234 s = splserial(); 1235 SSCOM_LOCK(sc); 1236 1237 if (block) { 1238 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1239 SET(sc->sc_rx_flags, RX_TTY_BLOCKED); 1240 sscom_hwiflow(sc); 1241 } 1242 } else { 1243 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1244 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1245 sscom_schedrx(sc); 1246 } 1247 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1248 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED); 1249 sscom_hwiflow(sc); 1250 } 1251 } 1252 1253 SSCOM_UNLOCK(sc); 1254 splx(s); 1255 return 1; 1256 } 1257 1258 /* 1259 * (un)block input via hw flowcontrol 1260 */ 1261 static void 1262 sscom_hwiflow(struct sscom_softc *sc) 1263 { 1264 if (sc->sc_mcr_rts == 0) 1265 return; 1266 1267 if (ISSET(sc->sc_rx_flags, RX_ANY_BLOCK)) { 1268 CLR(sc->sc_umcon, sc->sc_mcr_rts); 1269 CLR(sc->sc_mcr_active, sc->sc_mcr_rts); 1270 } else { 1271 SET(sc->sc_umcon, sc->sc_mcr_rts); 1272 SET(sc->sc_mcr_active, sc->sc_mcr_rts); 1273 } 1274 sc->sc_set_modem_control(sc); 1275 } 1276 1277 1278 void 1279 sscomstart(struct tty *tp) 1280 { 1281 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(tp->t_dev)); 1282 int s; 1283 1284 if (SSCOM_ISALIVE(sc) == 0) 1285 return; 1286 1287 s = spltty(); 1288 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 1289 goto out; 1290 if (sc->sc_tx_stopped) 1291 goto out; 1292 if (!ttypull(tp)) 1293 goto out; 1294 1295 /* Grab the first contiguous region of buffer space. */ 1296 { 1297 u_char *tba; 1298 int tbc; 1299 1300 tba = tp->t_outq.c_cf; 1301 tbc = ndqb(&tp->t_outq, 0); 1302 1303 (void)splserial(); 1304 SSCOM_LOCK(sc); 1305 1306 sc->sc_tba = tba; 1307 sc->sc_tbc = tbc; 1308 } 1309 1310 SET(tp->t_state, TS_BUSY); 1311 sc->sc_tx_busy = 1; 1312 1313 /* Output the first chunk of the contiguous buffer. */ 1314 sscom_output_chunk(sc); 1315 1316 /* Enable transmit completion interrupts if necessary. */ 1317 if ((sc->sc_hwflags & SSCOM_HW_TXINT) == 0) 1318 sscom_enable_txint(sc); 1319 1320 SSCOM_UNLOCK(sc); 1321 out: 1322 splx(s); 1323 return; 1324 } 1325 1326 /* 1327 * Stop output on a line. 1328 */ 1329 void 1330 sscomstop(struct tty *tp, int flag) 1331 { 1332 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(tp->t_dev)); 1333 int s; 1334 1335 s = splserial(); 1336 SSCOM_LOCK(sc); 1337 if (ISSET(tp->t_state, TS_BUSY)) { 1338 /* Stop transmitting at the next chunk. */ 1339 sc->sc_tbc = 0; 1340 sc->sc_heldtbc = 0; 1341 if (!ISSET(tp->t_state, TS_TTSTOP)) 1342 SET(tp->t_state, TS_FLUSH); 1343 } 1344 SSCOM_UNLOCK(sc); 1345 splx(s); 1346 } 1347 1348 void 1349 sscomdiag(void *arg) 1350 { 1351 struct sscom_softc *sc = arg; 1352 int overflows, floods; 1353 int s; 1354 1355 s = splserial(); 1356 SSCOM_LOCK(sc); 1357 overflows = sc->sc_overflows; 1358 sc->sc_overflows = 0; 1359 floods = sc->sc_floods; 1360 sc->sc_floods = 0; 1361 sc->sc_errors = 0; 1362 SSCOM_UNLOCK(sc); 1363 splx(s); 1364 1365 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1366 device_xname(sc->sc_dev), 1367 overflows, overflows == 1 ? "" : "s", 1368 floods, floods == 1 ? "" : "s"); 1369 } 1370 1371 integrate void 1372 sscom_rxsoft(struct sscom_softc *sc, struct tty *tp) 1373 { 1374 int (*rint) (int, struct tty *) = tp->t_linesw->l_rint; 1375 u_char *get, *end; 1376 u_int cc, scc; 1377 u_char rsr; 1378 int code; 1379 int s; 1380 1381 end = sc->sc_ebuf; 1382 get = sc->sc_rbget; 1383 scc = cc = sscom_rbuf_size - sc->sc_rbavail; 1384 1385 if (cc == sscom_rbuf_size) { 1386 sc->sc_floods++; 1387 if (sc->sc_errors++ == 0) 1388 callout_reset(&sc->sc_diag_callout, 60 * hz, 1389 sscomdiag, sc); 1390 } 1391 1392 while (cc) { 1393 code = get[0]; 1394 rsr = get[1]; 1395 if (rsr) { 1396 if (ISSET(rsr, UERSTAT_OVERRUN)) { 1397 sc->sc_overflows++; 1398 if (sc->sc_errors++ == 0) 1399 callout_reset(&sc->sc_diag_callout, 1400 60 * hz, sscomdiag, sc); 1401 } 1402 if (ISSET(rsr, UERSTAT_BREAK | UERSTAT_FRAME)) 1403 SET(code, TTY_FE); 1404 if (ISSET(rsr, UERSTAT_PARITY)) 1405 SET(code, TTY_PE); 1406 } 1407 if ((*rint)(code, tp) == -1) { 1408 /* 1409 * The line discipline's buffer is out of space. 1410 */ 1411 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1412 /* 1413 * We're either not using flow control, or the 1414 * line discipline didn't tell us to block for 1415 * some reason. Either way, we have no way to 1416 * know when there's more space available, so 1417 * just drop the rest of the data. 1418 */ 1419 get += cc << 1; 1420 if (get >= end) 1421 get -= sscom_rbuf_size << 1; 1422 cc = 0; 1423 } else { 1424 /* 1425 * Don't schedule any more receive processing 1426 * until the line discipline tells us there's 1427 * space available (through sscomhwiflow()). 1428 * Leave the rest of the data in the input 1429 * buffer. 1430 */ 1431 SET(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1432 } 1433 break; 1434 } 1435 get += 2; 1436 if (get >= end) 1437 get = sc->sc_rbuf; 1438 cc--; 1439 } 1440 1441 if (cc != scc) { 1442 sc->sc_rbget = get; 1443 s = splserial(); 1444 SSCOM_LOCK(sc); 1445 1446 cc = sc->sc_rbavail += scc - cc; 1447 /* Buffers should be ok again, release possible block. */ 1448 if (cc >= sc->sc_r_lowat) { 1449 if (ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1450 CLR(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1451 sscom_enable_rxint(sc); 1452 sc->sc_ucon |= UCON_ERRINT; 1453 bus_space_write_2(sc->sc_iot, sc->sc_ioh, SSCOM_UCON, 1454 sc->sc_ucon); 1455 1456 } 1457 if (ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED)) { 1458 CLR(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1459 sscom_hwiflow(sc); 1460 } 1461 } 1462 SSCOM_UNLOCK(sc); 1463 splx(s); 1464 } 1465 } 1466 1467 integrate void 1468 sscom_txsoft(struct sscom_softc *sc, struct tty *tp) 1469 { 1470 1471 CLR(tp->t_state, TS_BUSY); 1472 if (ISSET(tp->t_state, TS_FLUSH)) 1473 CLR(tp->t_state, TS_FLUSH); 1474 else 1475 ndflush(&tp->t_outq, (int)(sc->sc_tba - tp->t_outq.c_cf)); 1476 (*tp->t_linesw->l_start)(tp); 1477 } 1478 1479 integrate void 1480 sscom_stsoft(struct sscom_softc *sc, struct tty *tp) 1481 { 1482 u_char msr, delta; 1483 int s; 1484 1485 s = splserial(); 1486 SSCOM_LOCK(sc); 1487 msr = sc->sc_msts; 1488 delta = sc->sc_msr_delta; 1489 sc->sc_msr_delta = 0; 1490 SSCOM_UNLOCK(sc); 1491 splx(s); 1492 1493 if (ISSET(delta, sc->sc_msr_dcd)) { 1494 /* 1495 * Inform the tty layer that carrier detect changed. 1496 */ 1497 (void) (*tp->t_linesw->l_modem)(tp, ISSET(msr, MSTS_DCD)); 1498 } 1499 1500 if (ISSET(delta, sc->sc_msr_cts)) { 1501 /* Block or unblock output according to flow control. */ 1502 if (ISSET(msr, sc->sc_msr_cts)) { 1503 sc->sc_tx_stopped = 0; 1504 (*tp->t_linesw->l_start)(tp); 1505 } else { 1506 sc->sc_tx_stopped = 1; 1507 } 1508 } 1509 1510 if (sscom_debug) 1511 sscomstatus(sc, "sscom_stsoft"); 1512 } 1513 1514 void 1515 sscomsoft(void *arg) 1516 { 1517 struct sscom_softc *sc = arg; 1518 struct tty *tp; 1519 1520 if (SSCOM_ISALIVE(sc) == 0) 1521 return; 1522 1523 { 1524 tp = sc->sc_tty; 1525 1526 if (sc->sc_rx_ready) { 1527 sc->sc_rx_ready = 0; 1528 sscom_rxsoft(sc, tp); 1529 } 1530 1531 if (sc->sc_st_check) { 1532 sc->sc_st_check = 0; 1533 sscom_stsoft(sc, tp); 1534 } 1535 1536 if (sc->sc_tx_done) { 1537 sc->sc_tx_done = 0; 1538 sscom_txsoft(sc, tp); 1539 } 1540 } 1541 } 1542 1543 1544 int 1545 sscomrxintr(void *arg) 1546 { 1547 struct sscom_softc *sc = arg; 1548 bus_space_tag_t iot = sc->sc_iot; 1549 bus_space_handle_t ioh = sc->sc_ioh; 1550 u_char *put, *end; 1551 u_int cc; 1552 1553 if (SSCOM_ISALIVE(sc) == 0) 1554 return 0; 1555 1556 SSCOM_LOCK(sc); 1557 1558 end = sc->sc_ebuf; 1559 put = sc->sc_rbput; 1560 cc = sc->sc_rbavail; 1561 1562 do { 1563 u_char msts, delta; 1564 u_char uerstat; 1565 uint16_t ufstat; 1566 1567 ufstat = bus_space_read_2(iot, ioh, SSCOM_UFSTAT); 1568 1569 /* XXX: break interrupt with no character? */ 1570 1571 if ( (ufstat & (UFSTAT_RXCOUNT|UFSTAT_RXFULL)) && 1572 !ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1573 1574 while (cc > 0) { 1575 int cn_trapped = 0; 1576 1577 /* get status and received character. 1578 read status register first */ 1579 uerstat = sscom_geterr(iot, ioh); 1580 put[0] = sscom_getc(iot, ioh); 1581 1582 if (ISSET(uerstat, UERSTAT_BREAK)) { 1583 int con_trapped = 0; 1584 cn_check_magic(sc->sc_tty->t_dev, 1585 CNC_BREAK, sscom_cnm_state); 1586 if (con_trapped) 1587 continue; 1588 #if defined(KGDB) 1589 if (ISSET(sc->sc_hwflags, 1590 SSCOM_HW_KGDB)) { 1591 kgdb_connect(1); 1592 continue; 1593 } 1594 #endif 1595 } 1596 1597 put[1] = uerstat; 1598 cn_check_magic(sc->sc_tty->t_dev, 1599 put[0], sscom_cnm_state); 1600 if (!cn_trapped) { 1601 put += 2; 1602 if (put >= end) 1603 put = sc->sc_rbuf; 1604 cc--; 1605 } 1606 1607 ufstat = bus_space_read_2(iot, ioh, SSCOM_UFSTAT); 1608 if ( (ufstat & (UFSTAT_RXFULL|UFSTAT_RXCOUNT)) == 0 ) 1609 break; 1610 } 1611 1612 /* 1613 * Current string of incoming characters ended because 1614 * no more data was available or we ran out of space. 1615 * Schedule a receive event if any data was received. 1616 * If we're out of space, turn off receive interrupts. 1617 */ 1618 sc->sc_rbput = put; 1619 sc->sc_rbavail = cc; 1620 if (!ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) 1621 sc->sc_rx_ready = 1; 1622 1623 /* 1624 * See if we are in danger of overflowing a buffer. If 1625 * so, use hardware flow control to ease the pressure. 1626 */ 1627 if (!ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED) && 1628 cc < sc->sc_r_hiwat) { 1629 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1630 sscom_hwiflow(sc); 1631 } 1632 1633 /* 1634 * If we're out of space, disable receive interrupts 1635 * until the queue has drained a bit. 1636 */ 1637 if (!cc) { 1638 SET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1639 sscom_disable_rxint(sc); 1640 sc->sc_ucon &= ~UCON_ERRINT; 1641 bus_space_write_2(iot, ioh, SSCOM_UCON, sc->sc_ucon); 1642 } 1643 } 1644 1645 1646 msts = sc->sc_read_modem_status(sc); 1647 delta = msts ^ sc->sc_msts; 1648 sc->sc_msts = msts; 1649 1650 #ifdef notyet 1651 /* 1652 * Pulse-per-second (PSS) signals on edge of DCD? 1653 * Process these even if line discipline is ignoring DCD. 1654 */ 1655 if (delta & sc->sc_ppsmask) { 1656 struct timeval tv; 1657 if ((msr & sc->sc_ppsmask) == sc->sc_ppsassert) { 1658 /* XXX nanotime() */ 1659 microtime(&tv); 1660 TIMEVAL_TO_TIMESPEC(&tv, 1661 &sc->ppsinfo.assert_timestamp); 1662 if (sc->ppsparam.mode & PPS_OFFSETASSERT) { 1663 timespecadd(&sc->ppsinfo.assert_timestamp, 1664 &sc->ppsparam.assert_offset, 1665 &sc->ppsinfo.assert_timestamp); 1666 } 1667 1668 #ifdef PPS_SYNC 1669 if (sc->ppsparam.mode & PPS_HARDPPSONASSERT) 1670 hardpps(&tv, tv.tv_usec); 1671 #endif 1672 sc->ppsinfo.assert_sequence++; 1673 sc->ppsinfo.current_mode = sc->ppsparam.mode; 1674 1675 } else if ((msr & sc->sc_ppsmask) == sc->sc_ppsclear) { 1676 /* XXX nanotime() */ 1677 microtime(&tv); 1678 TIMEVAL_TO_TIMESPEC(&tv, 1679 &sc->ppsinfo.clear_timestamp); 1680 if (sc->ppsparam.mode & PPS_OFFSETCLEAR) { 1681 timespecadd(&sc->ppsinfo.clear_timestamp, 1682 &sc->ppsparam.clear_offset, 1683 &sc->ppsinfo.clear_timestamp); 1684 } 1685 1686 #ifdef PPS_SYNC 1687 if (sc->ppsparam.mode & PPS_HARDPPSONCLEAR) 1688 hardpps(&tv, tv.tv_usec); 1689 #endif 1690 sc->ppsinfo.clear_sequence++; 1691 sc->ppsinfo.current_mode = sc->ppsparam.mode; 1692 } 1693 } 1694 #endif 1695 1696 /* 1697 * Process normal status changes 1698 */ 1699 if (ISSET(delta, sc->sc_msr_mask)) { 1700 SET(sc->sc_msr_delta, delta); 1701 1702 /* 1703 * Stop output immediately if we lose the output 1704 * flow control signal or carrier detect. 1705 */ 1706 if (ISSET(~msts, sc->sc_msr_mask)) { 1707 sc->sc_tbc = 0; 1708 sc->sc_heldtbc = 0; 1709 #ifdef SSCOM_DEBUG 1710 if (sscom_debug) 1711 sscomstatus(sc, "sscomintr "); 1712 #endif 1713 } 1714 1715 sc->sc_st_check = 1; 1716 } 1717 1718 /* 1719 * Done handling any receive interrupts. 1720 */ 1721 1722 /* 1723 * If we've delayed a parameter change, do it 1724 * now, and restart * output. 1725 */ 1726 if ((ufstat & UFSTAT_TXCOUNT) == 0) { 1727 /* XXX: we should check transmitter empty also */ 1728 1729 if (sc->sc_heldchange) { 1730 sscom_loadchannelregs(sc); 1731 sc->sc_heldchange = 0; 1732 sc->sc_tbc = sc->sc_heldtbc; 1733 sc->sc_heldtbc = 0; 1734 } 1735 } 1736 1737 1738 } while (0); 1739 1740 SSCOM_UNLOCK(sc); 1741 1742 /* Wake up the poller. */ 1743 softint_schedule(sc->sc_si); 1744 1745 #ifdef RND_COM 1746 rnd_add_uint32(&sc->rnd_source, iir | rsr); 1747 #endif 1748 1749 return 1; 1750 } 1751 1752 int 1753 sscomtxintr(void *arg) 1754 { 1755 struct sscom_softc *sc = arg; 1756 bus_space_tag_t iot = sc->sc_iot; 1757 bus_space_handle_t ioh = sc->sc_ioh; 1758 uint16_t ufstat; 1759 1760 if (SSCOM_ISALIVE(sc) == 0) 1761 return 0; 1762 1763 SSCOM_LOCK(sc); 1764 1765 ufstat = bus_space_read_2(iot, ioh, SSCOM_UFSTAT); 1766 1767 /* 1768 * If we've delayed a parameter change, do it 1769 * now, and restart * output. 1770 */ 1771 if (sc->sc_heldchange && (ufstat & UFSTAT_TXCOUNT) == 0) { 1772 /* XXX: we should check transmitter empty also */ 1773 sscom_loadchannelregs(sc); 1774 sc->sc_heldchange = 0; 1775 sc->sc_tbc = sc->sc_heldtbc; 1776 sc->sc_heldtbc = 0; 1777 } 1778 1779 /* 1780 * See if data can be transmitted as well. Schedule tx 1781 * done event if no data left and tty was marked busy. 1782 */ 1783 if (!ISSET(ufstat,UFSTAT_TXFULL)) { 1784 /* 1785 * Output the next chunk of the contiguous 1786 * buffer, if any. 1787 */ 1788 if (sc->sc_tbc > 0) { 1789 __sscom_output_chunk(sc, ufstat); 1790 } 1791 else { 1792 /* 1793 * Disable transmit sscompletion 1794 * interrupts if necessary. 1795 */ 1796 if (sc->sc_hwflags & SSCOM_HW_TXINT) 1797 sscom_disable_txint(sc); 1798 if (sc->sc_tx_busy) { 1799 sc->sc_tx_busy = 0; 1800 sc->sc_tx_done = 1; 1801 } 1802 } 1803 } 1804 1805 SSCOM_UNLOCK(sc); 1806 1807 /* Wake up the poller. */ 1808 softint_schedule(sc->sc_si); 1809 1810 #ifdef RND_COM 1811 rnd_add_uint32(&sc->rnd_source, iir | rsr); 1812 #endif 1813 1814 return 1; 1815 } 1816 1817 1818 #if defined(KGDB) || defined(SSCOM0CONSOLE) || defined(SSCOM1CONSOLE) 1819 /* 1820 * Initialize UART for use as console or KGDB line. 1821 */ 1822 static int 1823 sscom_init(bus_space_tag_t iot, const struct sscom_uart_info *config, 1824 int rate, int frequency, tcflag_t cflag, bus_space_handle_t *iohp) 1825 { 1826 bus_space_handle_t ioh; 1827 bus_addr_t iobase = config->iobase; 1828 1829 if (bus_space_map(iot, iobase, SSCOM_SIZE, 0, &ioh)) 1830 return ENOMEM; /* ??? */ 1831 1832 bus_space_write_2(iot, ioh, SSCOM_UCON, 0); 1833 bus_space_write_1(iot, ioh, SSCOM_UFCON, 1834 #ifdef SSCOM_S3C2440 1835 UFCON_TXTRIGGER_16 | UFCON_RXTRIGGER_16 | 1836 #else 1837 UFCON_TXTRIGGER_8 | UFCON_RXTRIGGER_8 | 1838 #endif 1839 UFCON_TXFIFO_RESET | UFCON_RXFIFO_RESET | 1840 UFCON_FIFO_ENABLE ); 1841 /* tx/rx fifo reset are auto-cleared */ 1842 1843 rate = sscomspeed(rate, frequency); 1844 bus_space_write_2(iot, ioh, SSCOM_UBRDIV, rate); 1845 bus_space_write_2(iot, ioh, SSCOM_ULCON, cflag2lcr(cflag)); 1846 1847 /* enable UART */ 1848 bus_space_write_2(iot, ioh, SSCOM_UCON, 1849 UCON_TXMODE_INT|UCON_RXMODE_INT); 1850 bus_space_write_2(iot, ioh, SSCOM_UMCON, UMCON_RTS); 1851 1852 *iohp = ioh; 1853 return 0; 1854 } 1855 1856 #endif 1857 1858 #if defined(SSCOM0CONSOLE) || defined(SSCOM1CONSOLE) 1859 /* 1860 * Following are all routines needed for SSCOM to act as console 1861 */ 1862 struct consdev sscomcons = { 1863 NULL, NULL, sscomcngetc, sscomcnputc, sscomcnpollc, NULL, 1864 NULL, NULL, NODEV, CN_NORMAL 1865 }; 1866 1867 1868 int 1869 sscom_cnattach(bus_space_tag_t iot, const struct sscom_uart_info *config, 1870 int rate, int frequency, tcflag_t cflag) 1871 { 1872 int res; 1873 1874 res = sscom_init(iot, config, rate, frequency, cflag, &sscomconsioh); 1875 if (res) 1876 return res; 1877 1878 cn_tab = &sscomcons; 1879 cn_init_magic(&sscom_cnm_state); 1880 cn_set_magic("\047\001"); /* default magic is BREAK */ 1881 1882 sscomconstag = iot; 1883 sscomconsunit = config->unit; 1884 sscomconsrate = rate; 1885 sscomconscflag = cflag; 1886 1887 return 0; 1888 } 1889 1890 void 1891 sscom_cndetach(void) 1892 { 1893 bus_space_unmap(sscomconstag, sscomconsioh, SSCOM_SIZE); 1894 sscomconstag = NULL; 1895 1896 cn_tab = NULL; 1897 } 1898 1899 /* 1900 * The read-ahead code is so that you can detect pending in-band 1901 * cn_magic in polled mode while doing output rather than having to 1902 * wait until the kernel decides it needs input. 1903 */ 1904 1905 #define MAX_READAHEAD 20 1906 static int sscom_readahead[MAX_READAHEAD]; 1907 static int sscom_readaheadcount = 0; 1908 1909 int 1910 sscomcngetc(dev_t dev) 1911 { 1912 int s = splserial(); 1913 u_char __attribute__((__unused__)) stat; 1914 u_char c; 1915 1916 /* got a character from reading things earlier */ 1917 if (sscom_readaheadcount > 0) { 1918 int i; 1919 1920 c = sscom_readahead[0]; 1921 for (i = 1; i < sscom_readaheadcount; i++) { 1922 sscom_readahead[i-1] = sscom_readahead[i]; 1923 } 1924 sscom_readaheadcount--; 1925 splx(s); 1926 return c; 1927 } 1928 1929 /* block until a character becomes available */ 1930 while (!sscom_rxrdy(sscomconstag, sscomconsioh)) 1931 ; 1932 1933 c = sscom_getc(sscomconstag, sscomconsioh); 1934 stat = sscom_geterr(sscomconstag, sscomconsioh); 1935 { 1936 int __attribute__((__unused__))cn_trapped = 0; 1937 #ifdef DDB 1938 extern int db_active; 1939 if (!db_active) 1940 #endif 1941 cn_check_magic(dev, c, sscom_cnm_state); 1942 } 1943 splx(s); 1944 return c; 1945 } 1946 1947 /* 1948 * Console kernel output character routine. 1949 */ 1950 void 1951 sscomcnputc(dev_t dev, int c) 1952 { 1953 int s = splserial(); 1954 int timo; 1955 1956 int cin; 1957 int __attribute__((__unused__)) stat; 1958 if (sscom_readaheadcount < MAX_READAHEAD && 1959 sscom_rxrdy(sscomconstag, sscomconsioh)) { 1960 1961 int __attribute__((__unused__))cn_trapped = 0; 1962 cin = sscom_getc(sscomconstag, sscomconsioh); 1963 stat = sscom_geterr(sscomconstag, sscomconsioh); 1964 cn_check_magic(dev, cin, sscom_cnm_state); 1965 sscom_readahead[sscom_readaheadcount++] = cin; 1966 } 1967 1968 /* wait for any pending transmission to finish */ 1969 timo = 150000; 1970 while (ISSET(bus_space_read_2(sscomconstag, sscomconsioh, SSCOM_UFSTAT), 1971 UFSTAT_TXFULL) && --timo) 1972 continue; 1973 1974 bus_space_write_1(sscomconstag, sscomconsioh, SSCOM_UTXH, c); 1975 SSCOM_BARRIER(sscomconstag, sscomconsioh, BR | BW); 1976 1977 #if 0 1978 /* wait for this transmission to complete */ 1979 timo = 1500000; 1980 while (!ISSET(bus_space_read_1(sscomconstag, sscomconsioh, SSCOM_UTRSTAT), 1981 UTRSTAT_TXEMPTY) && --timo) 1982 continue; 1983 #endif 1984 splx(s); 1985 } 1986 1987 void 1988 sscomcnpollc(dev_t dev, int on) 1989 { 1990 1991 sscom_readaheadcount = 0; 1992 } 1993 1994 #endif /* SSCOM0CONSOLE||SSCOM1CONSOLE */ 1995 1996 #ifdef KGDB 1997 int 1998 sscom_kgdb_attach(bus_space_tag_t iot, const struct sscom_uart_info *config, 1999 int rate, int frequency, tcflag_t cflag) 2000 { 2001 int res; 2002 2003 if (iot == sscomconstag && config->unit == sscomconsunit) { 2004 printf( "console==kgdb_port (%d): kgdb disabled\n", sscomconsunit); 2005 return EBUSY; /* cannot share with console */ 2006 } 2007 2008 res = sscom_init(iot, config, rate, frequency, cflag, &sscom_kgdb_ioh); 2009 if (res) 2010 return res; 2011 2012 kgdb_attach(sscom_kgdb_getc, sscom_kgdb_putc, NULL); 2013 kgdb_dev = 123; /* unneeded, only to satisfy some tests */ 2014 2015 sscom_kgdb_iot = iot; 2016 sscom_kgdb_unit = config->unit; 2017 2018 return 0; 2019 } 2020 2021 /* ARGSUSED */ 2022 int 2023 sscom_kgdb_getc(void *arg) 2024 { 2025 int c, stat; 2026 2027 /* block until a character becomes available */ 2028 while (!sscom_rxrdy(sscom_kgdb_iot, sscom_kgdb_ioh)) 2029 ; 2030 2031 c = sscom_getc(sscom_kgdb_iot, sscom_kgdb_ioh); 2032 stat = sscom_geterr(sscom_kgdb_iot, sscom_kgdb_ioh); 2033 2034 return c; 2035 } 2036 2037 /* ARGSUSED */ 2038 void 2039 sscom_kgdb_putc(void *arg, int c) 2040 { 2041 int timo; 2042 2043 /* wait for any pending transmission to finish */ 2044 timo = 150000; 2045 while (ISSET(bus_space_read_2(sscom_kgdb_iot, sscom_kgdb_ioh, 2046 SSCOM_UFSTAT), UFSTAT_TXFULL) && --timo) 2047 continue; 2048 2049 bus_space_write_1(sscom_kgdb_iot, sscom_kgdb_ioh, SSCOM_UTXH, c); 2050 SSCOM_BARRIER(sscom_kgdb_iot, sscom_kgdb_ioh, BR | BW); 2051 2052 #if 0 2053 /* wait for this transmission to complete */ 2054 timo = 1500000; 2055 while (!ISSET(bus_space_read_1(sscom_kgdb_iot, sscom_kgdb_ioh, 2056 SSCOM_UTRSTAT), UTRSTAT_TXEMPTY) && --timo) 2057 continue; 2058 #endif 2059 } 2060 #endif /* KGDB */ 2061 2062 /* helper function to identify the sscom ports used by 2063 console or KGDB (and not yet autoconf attached) */ 2064 int 2065 sscom_is_console(bus_space_tag_t iot, int unit, 2066 bus_space_handle_t *ioh) 2067 { 2068 bus_space_handle_t help; 2069 2070 if (!sscomconsattached && 2071 iot == sscomconstag && unit == sscomconsunit) 2072 help = sscomconsioh; 2073 #ifdef KGDB 2074 else if (!sscom_kgdb_attached && 2075 iot == sscom_kgdb_iot && unit == sscom_kgdb_unit) 2076 help = sscom_kgdb_ioh; 2077 #endif 2078 else 2079 return 0; 2080 2081 if (ioh) 2082 *ioh = help; 2083 return 1; 2084 } 2085
Indexes created Mon Sep 29 03:10:08 GMT 2025