sscom.c revision 1.37
1 /* $NetBSD: sscom.c,v 1.37 2012/02/07 09:06:05 nisimura 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 1.37 2012/02/07 09:06:05 nisimura 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> 145 146 #include <arm/s3c2xx0/s3c2xx0reg.h> 147 #include <arm/s3c2xx0/s3c2xx0var.h> 148 #if defined(SSCOM_S3C2410) || defined(SSCOM_S3C2400) || defined(SSCOM_S3C2440) 149 #include <arm/s3c2xx0/s3c24x0reg.h> 150 #elif defined(SSCOM_S3C2800) 151 #include <arm/s3c2xx0/s3c2800reg.h> 152 #endif 153 #include <arm/s3c2xx0/sscom_var.h> 154 #include <dev/cons.h> 155 156 dev_type_open(sscomopen); 157 dev_type_close(sscomclose); 158 dev_type_read(sscomread); 159 dev_type_write(sscomwrite); 160 dev_type_ioctl(sscomioctl); 161 dev_type_stop(sscomstop); 162 dev_type_tty(sscomtty); 163 dev_type_poll(sscompoll); 164 165 int sscomcngetc (dev_t); 166 void sscomcnputc (dev_t, int); 167 void sscomcnpollc (dev_t, int); 168 169 #define integrate static inline 170 void sscomsoft (void *); 171 172 integrate void sscom_rxsoft (struct sscom_softc *, struct tty *); 173 integrate void sscom_txsoft (struct sscom_softc *, struct tty *); 174 integrate void sscom_stsoft (struct sscom_softc *, struct tty *); 175 integrate void sscom_schedrx (struct sscom_softc *); 176 static void sscom_modem(struct sscom_softc *, int); 177 static void sscom_break(struct sscom_softc *, int); 178 static void sscom_iflush(struct sscom_softc *); 179 static void sscom_hwiflow(struct sscom_softc *); 180 static void sscom_loadchannelregs(struct sscom_softc *); 181 static void tiocm_to_sscom(struct sscom_softc *, u_long, int); 182 static int sscom_to_tiocm(struct sscom_softc *); 183 static void tiocm_to_sscom(struct sscom_softc *, u_long, int); 184 static int sscom_to_tiocm(struct sscom_softc *); 185 static void sscom_iflush(struct sscom_softc *); 186 187 static int sscomhwiflow(struct tty *tp, int block); 188 static int sscom_init(bus_space_tag_t, const struct sscom_uart_info *, 189 int, int, tcflag_t, bus_space_handle_t *); 190 191 extern struct cfdriver sscom_cd; 192 193 const struct cdevsw sscom_cdevsw = { 194 sscomopen, sscomclose, sscomread, sscomwrite, sscomioctl, 195 sscomstop, sscomtty, sscompoll, nommap, ttykqfilter, D_TTY 196 }; 197 198 /* 199 * Make this an option variable one can patch. 200 * But be warned: this must be a power of 2! 201 */ 202 u_int sscom_rbuf_size = SSCOM_RING_SIZE; 203 204 /* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */ 205 u_int sscom_rbuf_hiwat = (SSCOM_RING_SIZE * 1) / 4; 206 u_int sscom_rbuf_lowat = (SSCOM_RING_SIZE * 3) / 4; 207 208 static int sscomconsunit = -1; 209 static bus_space_tag_t sscomconstag; 210 static bus_space_handle_t sscomconsioh; 211 static int sscomconsattached; 212 static int sscomconsrate; 213 static tcflag_t sscomconscflag; 214 static struct cnm_state sscom_cnm_state; 215 216 #ifdef KGDB 217 #include <sys/kgdb.h> 218 219 static int sscom_kgdb_unit = -1; 220 static bus_space_tag_t sscom_kgdb_iot; 221 static bus_space_handle_t sscom_kgdb_ioh; 222 static int sscom_kgdb_attached; 223 224 int sscom_kgdb_getc (void *); 225 void sscom_kgdb_putc (void *, int); 226 #endif /* KGDB */ 227 228 #define SSCOMUNIT_MASK 0x7f 229 #define SSCOMDIALOUT_MASK 0x80 230 231 #define SSCOMUNIT(x) (minor(x) & SSCOMUNIT_MASK) 232 #define SSCOMDIALOUT(x) (minor(x) & SSCOMDIALOUT_MASK) 233 234 #if 0 235 #define SSCOM_ISALIVE(sc) ((sc)->enabled != 0 && \ 236 device_is_active(&(sc)->sc_dev)) 237 #else 238 #define SSCOM_ISALIVE(sc) device_is_active((sc)->sc_dev) 239 #endif 240 241 #define BR BUS_SPACE_BARRIER_READ 242 #define BW BUS_SPACE_BARRIER_WRITE 243 #define SSCOM_BARRIER(t, h, f) /* no-op */ 244 245 #if (defined(MULTIPROCESSOR) || defined(LOCKDEBUG)) && defined(SSCOM_MPLOCK) 246 247 #define SSCOM_LOCK(sc) simple_lock((sc)->sc_lock) 248 #define SSCOM_UNLOCK(sc) simple_unlock((sc)->sc_lock) 249 250 #else 251 252 #define SSCOM_LOCK(sc) 253 #define SSCOM_UNLOCK(sc) 254 255 #endif 256 257 #ifndef SSCOM_TOLERANCE 258 #define SSCOM_TOLERANCE 30 /* XXX: baud rate tolerance, in 0.1% units */ 259 #endif 260 261 /* value for UCON */ 262 #define UCON_RXINT_MASK \ 263 (UCON_RXMODE_MASK|UCON_ERRINT|UCON_TOINT|UCON_RXINT_TYPE) 264 #define UCON_RXINT_ENABLE \ 265 (UCON_RXMODE_INT|UCON_ERRINT|UCON_TOINT|UCON_RXINT_TYPE_LEVEL) 266 #define UCON_TXINT_MASK (UCON_TXMODE_MASK|UCON_TXINT_TYPE) 267 #define UCON_TXINT_ENABLE (UCON_TXMODE_INT|UCON_TXINT_TYPE_LEVEL) 268 269 /* we don't want tx interrupt on debug port, but it is needed to 270 have transmitter active */ 271 #define UCON_DEBUGPORT (UCON_RXINT_ENABLE|UCON_TXINT_ENABLE) 272 273 274 static inline void 275 __sscom_output_chunk(struct sscom_softc *sc, int ufstat) 276 { 277 int n, space; 278 bus_space_tag_t iot = sc->sc_iot; 279 bus_space_handle_t ioh = sc->sc_ioh; 280 281 n = sc->sc_tbc; 282 space = 16 - ((ufstat & UFSTAT_TXCOUNT) >> UFSTAT_TXCOUNT_SHIFT); 283 284 if (n > space) 285 n = space; 286 287 if (n > 0) { 288 bus_space_write_multi_1(iot, ioh, SSCOM_UTXH, sc->sc_tba, n); 289 sc->sc_tbc -= n; 290 sc->sc_tba += n; 291 } 292 } 293 294 static void 295 sscom_output_chunk(struct sscom_softc *sc) 296 { 297 int ufstat = bus_space_read_2(sc->sc_iot, sc->sc_ioh, SSCOM_UFSTAT); 298 299 if (!(ufstat & UFSTAT_TXFULL)) 300 __sscom_output_chunk(sc, ufstat); 301 } 302 303 int 304 sscomspeed(long speed, long frequency) 305 { 306 #define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */ 307 308 int x, err; 309 310 if (speed <= 0) 311 return -1; 312 x = divrnd(frequency / 16, speed); 313 if (x <= 0) 314 return -1; 315 err = divrnd(((quad_t)frequency) * 1000 / 16, speed * x) - 1000; 316 if (err < 0) 317 err = -err; 318 if (err > SSCOM_TOLERANCE) 319 return -1; 320 return x-1; 321 322 #undef divrnd 323 } 324 325 void sscomstatus (struct sscom_softc *, const char *); 326 327 #ifdef SSCOM_DEBUG 328 int sscom_debug = 0; 329 330 void 331 sscomstatus(struct sscom_softc *sc, const char *str) 332 { 333 struct tty *tp = sc->sc_tty; 334 int umstat = bus_space_read_1(sc->sc_iot, sc->sc_iot, SSCOM_UMSTAT); 335 int umcon = bus_space_read_1(sc->sc_iot, sc->sc_iot, SSCOM_UMCON); 336 337 printf("%s: %s %sclocal %sdcd %sts_carr_on %sdtr %stx_stopped\n", 338 sc->sc_dev->dv_xname, str, 339 ISSET(tp->t_cflag, CLOCAL) ? "+" : "-", 340 "+", /* DCD */ 341 ISSET(tp->t_state, TS_CARR_ON) ? "+" : "-", 342 "+", /* DTR */ 343 sc->sc_tx_stopped ? "+" : "-"); 344 345 printf("%s: %s %scrtscts %scts %sts_ttstop %srts %xrx_flags\n", 346 sc->sc_dev->dv_xname, str, 347 ISSET(tp->t_cflag, CRTSCTS) ? "+" : "-", 348 ISSET(umstat, UMSTAT_CTS) ? "+" : "-", 349 ISSET(tp->t_state, TS_TTSTOP) ? "+" : "-", 350 ISSET(umcon, UMCON_RTS) ? "+" : "-", 351 sc->sc_rx_flags); 352 } 353 #else 354 #define sscom_debug 0 355 #endif 356 357 static void 358 sscom_enable_debugport(struct sscom_softc *sc) 359 { 360 int s; 361 362 /* Turn on line break interrupt, set carrier. */ 363 s = splserial(); 364 SSCOM_LOCK(sc); 365 sc->sc_ucon = UCON_DEBUGPORT; 366 bus_space_write_2(sc->sc_iot, sc->sc_ioh, SSCOM_UCON, sc->sc_ucon); 367 sc->sc_umcon = UMCON_RTS|UMCON_DTR; 368 sc->set_modem_control(sc); 369 sscom_enable_rxint(sc); 370 sscom_disable_txint(sc); 371 SSCOM_UNLOCK(sc); 372 splx(s); 373 } 374 375 static void 376 sscom_set_modem_control(struct sscom_softc *sc) 377 { 378 /* flob RTS */ 379 bus_space_write_1(sc->sc_iot, sc->sc_ioh, 380 SSCOM_UMCON, sc->sc_umcon & UMCON_HW_MASK); 381 /* ignore DTR */ 382 } 383 384 static int 385 sscom_read_modem_status(struct sscom_softc *sc) 386 { 387 int msts; 388 389 msts = bus_space_read_1(sc->sc_iot, sc->sc_ioh, SSCOM_UMSTAT); 390 391 /* DCD and DSR are always on */ 392 return (msts & UMSTAT_CTS) | MSTS_DCD | MSTS_DSR; 393 } 394 395 void 396 sscom_attach_subr(struct sscom_softc *sc) 397 { 398 int unit = sc->sc_unit; 399 bus_space_tag_t iot = sc->sc_iot; 400 bus_space_handle_t ioh = sc->sc_ioh; 401 struct tty *tp; 402 403 callout_init(&sc->sc_diag_callout, 0); 404 #if (defined(MULTIPROCESSOR) || defined(LOCKDEBUG)) && defined(SSCOM_MPLOCK) 405 simple_lock_init(&sc->sc_lock); 406 #endif 407 408 sc->sc_ucon = UCON_RXINT_ENABLE|UCON_TXINT_ENABLE; 409 410 /* 411 * set default for modem control hook 412 */ 413 if (sc->set_modem_control == NULL) 414 sc->set_modem_control = sscom_set_modem_control; 415 if (sc->read_modem_status == NULL) 416 sc->read_modem_status = sscom_read_modem_status; 417 418 /* Disable interrupts before configuring the device. */ 419 sscom_disable_txrxint(sc); 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 (unit == sscom_kgdb_unit) { 427 SET(sc->sc_hwflags, SSCOM_HW_KGDB); 428 sc->sc_ucon = UCON_DEBUGPORT; 429 } 430 #endif 431 432 if (unit == sscomconsunit) { 433 int timo, stat; 434 435 sscomconsattached = 1; 436 sscomconstag = iot; 437 sscomconsioh = ioh; 438 439 /* wait for this transmission to complete */ 440 timo = 1500000; 441 do { 442 stat = bus_space_read_1(iot, ioh, SSCOM_UTRSTAT); 443 } while ((stat & UTRSTAT_TXEMPTY) == 0 && --timo > 0); 444 445 /* Make sure the console is always "hardwired". */ 446 SET(sc->sc_hwflags, SSCOM_HW_CONSOLE); 447 SET(sc->sc_swflags, TIOCFLAG_SOFTCAR); 448 449 sc->sc_ucon = UCON_DEBUGPORT; 450 } 451 452 bus_space_write_1(iot, ioh, SSCOM_UFCON, 453 #ifdef SSCOM_S3C2440 454 UFCON_TXTRIGGER_16|UFCON_RXTRIGGER_16|UFCON_FIFO_ENABLE| 455 #else 456 UFCON_TXTRIGGER_8|UFCON_RXTRIGGER_8|UFCON_FIFO_ENABLE| 457 #endif 458 UFCON_TXFIFO_RESET|UFCON_RXFIFO_RESET); 459 460 bus_space_write_1(iot, ioh, SSCOM_UCON, sc->sc_ucon); 461 462 #ifdef KGDB 463 if (ISSET(sc->sc_hwflags, SSCOM_HW_KGDB)) { 464 sscom_kgdb_attached = 1; 465 printf("%s: kgdb\n", sc->sc_dev->dv_xname); 466 sscom_enable_debugport(sc); 467 return; 468 } 469 #endif 470 471 tp = tty_alloc(); 472 tp->t_oproc = sscomstart; 473 tp->t_param = sscomparam; 474 tp->t_hwiflow = sscomhwiflow; 475 476 sc->sc_tty = tp; 477 sc->sc_rbuf = malloc(sscom_rbuf_size << 1, M_DEVBUF, M_NOWAIT); 478 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 479 sc->sc_rbavail = sscom_rbuf_size; 480 if (sc->sc_rbuf == NULL) { 481 printf("%s: unable to allocate ring buffer\n", 482 sc->sc_dev->dv_xname); 483 return; 484 } 485 sc->sc_ebuf = sc->sc_rbuf + (sscom_rbuf_size << 1); 486 487 tty_attach(tp); 488 489 if (ISSET(sc->sc_hwflags, SSCOM_HW_CONSOLE)) { 490 int maj; 491 492 /* locate the major number */ 493 maj = cdevsw_lookup_major(&sscom_cdevsw); 494 495 cn_tab->cn_dev = makedev(maj, device_unit(sc->sc_dev)); 496 497 printf("%s: console (major=%d)\n", device_xname(sc->sc_dev), maj); 498 } 499 500 501 sc->sc_si = softint_establish(SOFTINT_SERIAL, sscomsoft, sc); 502 503 #ifdef RND_COM 504 rnd_attach_source(&sc->rnd_source, sc->sc_dev.dv_xname, 505 RND_TYPE_TTY, 0); 506 #endif 507 508 /* if there are no enable/disable functions, assume the device 509 is always enabled */ 510 511 if (ISSET(sc->sc_hwflags, SSCOM_HW_CONSOLE)) 512 sscom_enable_debugport(sc); 513 else 514 sscom_disable_txrxint(sc); 515 516 SET(sc->sc_hwflags, SSCOM_HW_DEV_OK); 517 } 518 519 int 520 sscom_detach(device_t self, int flags) 521 { 522 struct sscom_softc *sc = device_private(self); 523 524 if (sc->sc_hwflags & (SSCOM_HW_CONSOLE|SSCOM_HW_KGDB)) 525 return EBUSY; 526 527 return 0; 528 } 529 530 int 531 sscom_activate(device_t self, enum devact act) 532 { 533 #ifdef notyet 534 struct sscom_softc *sc = device_private(self); 535 #endif 536 537 switch (act) { 538 case DVACT_DEACTIVATE: 539 #ifdef notyet 540 sc->enabled = 0; 541 #endif 542 return 0; 543 default: 544 return EOPNOTSUPP; 545 } 546 } 547 548 void 549 sscom_shutdown(struct sscom_softc *sc) 550 { 551 #ifdef notyet 552 struct tty *tp = sc->sc_tty; 553 int s; 554 555 s = splserial(); 556 SSCOM_LOCK(sc); 557 558 /* If we were asserting flow control, then deassert it. */ 559 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 560 sscom_hwiflow(sc); 561 562 /* Clear any break condition set with TIOCSBRK. */ 563 sscom_break(sc, 0); 564 565 /* 566 * Hang up if necessary. Wait a bit, so the other side has time to 567 * notice even if we immediately open the port again. 568 * Avoid tsleeping above splhigh(). 569 */ 570 if (ISSET(tp->t_cflag, HUPCL)) { 571 sscom_modem(sc, 0); 572 SSCOM_UNLOCK(sc); 573 splx(s); 574 /* XXX tsleep will only timeout */ 575 (void) tsleep(sc, TTIPRI, ttclos, hz); 576 s = splserial(); 577 SSCOM_LOCK(sc); 578 } 579 580 if (ISSET(sc->sc_hwflags, SSCOM_HW_CONSOLE)) 581 /* interrupt on break */ 582 sc->sc_ucon = UCON_DEBUGPORT; 583 else 584 sc->sc_ucon = 0; 585 bus_space_write_2(sc->sc_iot, sc->sc_ioh, SSCOM_UCON, sc->sc_ucon); 586 587 #ifdef DIAGNOSTIC 588 if (!sc->enabled) 589 panic("sscom_shutdown: not enabled?"); 590 #endif 591 sc->enabled = 0; 592 SSCOM_UNLOCK(sc); 593 splx(s); 594 #endif 595 } 596 597 int 598 sscomopen(dev_t dev, int flag, int mode, struct lwp *l) 599 { 600 struct sscom_softc *sc; 601 struct tty *tp; 602 int s, s2; 603 int error; 604 605 sc = device_lookup_private(&sscom_cd, SSCOMUNIT(dev)); 606 if (sc == NULL || !ISSET(sc->sc_hwflags, SSCOM_HW_DEV_OK) || 607 sc->sc_rbuf == NULL) 608 return ENXIO; 609 610 if (!device_is_active(sc->sc_dev)) 611 return ENXIO; 612 613 #ifdef KGDB 614 /* 615 * If this is the kgdb port, no other use is permitted. 616 */ 617 if (ISSET(sc->sc_hwflags, SSCOM_HW_KGDB)) 618 return EBUSY; 619 #endif 620 621 tp = sc->sc_tty; 622 623 if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp)) 624 return (EBUSY); 625 626 s = spltty(); 627 628 /* 629 * Do the following iff this is a first open. 630 */ 631 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 632 struct termios t; 633 634 tp->t_dev = dev; 635 636 s2 = splserial(); 637 SSCOM_LOCK(sc); 638 639 /* Turn on interrupts. */ 640 sscom_enable_txrxint(sc); 641 642 /* Fetch the current modem control status, needed later. */ 643 sc->sc_msts = sc->read_modem_status(sc); 644 645 #if 0 646 /* Clear PPS capture state on first open. */ 647 sc->sc_ppsmask = 0; 648 sc->ppsparam.mode = 0; 649 #endif 650 651 SSCOM_UNLOCK(sc); 652 splx(s2); 653 654 /* 655 * Initialize the termios status to the defaults. Add in the 656 * sticky bits from TIOCSFLAGS. 657 */ 658 t.c_ispeed = 0; 659 if (ISSET(sc->sc_hwflags, SSCOM_HW_CONSOLE)) { 660 t.c_ospeed = sscomconsrate; 661 t.c_cflag = sscomconscflag; 662 } else { 663 t.c_ospeed = TTYDEF_SPEED; 664 t.c_cflag = TTYDEF_CFLAG; 665 } 666 if (ISSET(sc->sc_swflags, TIOCFLAG_CLOCAL)) 667 SET(t.c_cflag, CLOCAL); 668 if (ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS)) 669 SET(t.c_cflag, CRTSCTS); 670 if (ISSET(sc->sc_swflags, TIOCFLAG_MDMBUF)) 671 SET(t.c_cflag, MDMBUF); 672 /* Make sure sscomparam() will do something. */ 673 tp->t_ospeed = 0; 674 (void) sscomparam(tp, &t); 675 tp->t_iflag = TTYDEF_IFLAG; 676 tp->t_oflag = TTYDEF_OFLAG; 677 tp->t_lflag = TTYDEF_LFLAG; 678 ttychars(tp); 679 ttsetwater(tp); 680 681 s2 = splserial(); 682 SSCOM_LOCK(sc); 683 684 /* 685 * Turn on DTR. We must always do this, even if carrier is not 686 * present, because otherwise we'd have to use TIOCSDTR 687 * immediately after setting CLOCAL, which applications do not 688 * expect. We always assert DTR while the device is open 689 * unless explicitly requested to deassert it. 690 */ 691 sscom_modem(sc, 1); 692 693 /* Clear the input ring, and unblock. */ 694 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 695 sc->sc_rbavail = sscom_rbuf_size; 696 sscom_iflush(sc); 697 CLR(sc->sc_rx_flags, RX_ANY_BLOCK); 698 sscom_hwiflow(sc); 699 700 if (sscom_debug) 701 sscomstatus(sc, "sscomopen "); 702 703 SSCOM_UNLOCK(sc); 704 splx(s2); 705 } 706 707 splx(s); 708 709 error = ttyopen(tp, SSCOMDIALOUT(dev), ISSET(flag, O_NONBLOCK)); 710 if (error) 711 goto bad; 712 713 error = (*tp->t_linesw->l_open)(dev, tp); 714 if (error) 715 goto bad; 716 717 return 0; 718 719 bad: 720 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 721 /* 722 * We failed to open the device, and nobody else had it opened. 723 * Clean up the state as appropriate. 724 */ 725 sscom_shutdown(sc); 726 } 727 728 return error; 729 } 730 731 int 732 sscomclose(dev_t dev, int flag, int mode, struct lwp *l) 733 { 734 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(dev)); 735 struct tty *tp = sc->sc_tty; 736 737 /* XXX This is for cons.c. */ 738 if (!ISSET(tp->t_state, TS_ISOPEN)) 739 return 0; 740 741 (*tp->t_linesw->l_close)(tp, flag); 742 ttyclose(tp); 743 744 if (SSCOM_ISALIVE(sc) == 0) 745 return 0; 746 747 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 748 /* 749 * Although we got a last close, the device may still be in 750 * use; e.g. if this was the dialout node, and there are still 751 * processes waiting for carrier on the non-dialout node. 752 */ 753 sscom_shutdown(sc); 754 } 755 756 return 0; 757 } 758 759 int 760 sscomread(dev_t dev, struct uio *uio, int flag) 761 { 762 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(dev)); 763 struct tty *tp = sc->sc_tty; 764 765 if (SSCOM_ISALIVE(sc) == 0) 766 return EIO; 767 768 return (*tp->t_linesw->l_read)(tp, uio, flag); 769 } 770 771 int 772 sscomwrite(dev_t dev, struct uio *uio, int flag) 773 { 774 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(dev)); 775 struct tty *tp = sc->sc_tty; 776 777 if (SSCOM_ISALIVE(sc) == 0) 778 return EIO; 779 780 return (*tp->t_linesw->l_write)(tp, uio, flag); 781 } 782 783 int 784 sscompoll(dev_t dev, int events, struct lwp *l) 785 { 786 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(dev)); 787 struct tty *tp = sc->sc_tty; 788 789 if (SSCOM_ISALIVE(sc) == 0) 790 return EIO; 791 792 return (*tp->t_linesw->l_poll)(tp, events, l); 793 } 794 795 struct tty * 796 sscomtty(dev_t dev) 797 { 798 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(dev)); 799 struct tty *tp = sc->sc_tty; 800 801 return tp; 802 } 803 804 int 805 sscomioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 806 { 807 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(dev)); 808 struct tty *tp = sc->sc_tty; 809 int error; 810 int s; 811 812 if (SSCOM_ISALIVE(sc) == 0) 813 return EIO; 814 815 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 816 if (error != EPASSTHROUGH) 817 return error; 818 819 error = ttioctl(tp, cmd, data, flag, l); 820 if (error != EPASSTHROUGH) 821 return error; 822 823 error = 0; 824 825 s = splserial(); 826 SSCOM_LOCK(sc); 827 828 switch (cmd) { 829 case TIOCSBRK: 830 sscom_break(sc, 1); 831 break; 832 833 case TIOCCBRK: 834 sscom_break(sc, 0); 835 break; 836 837 case TIOCSDTR: 838 sscom_modem(sc, 1); 839 break; 840 841 case TIOCCDTR: 842 sscom_modem(sc, 0); 843 break; 844 845 case TIOCGFLAGS: 846 *(int *)data = sc->sc_swflags; 847 break; 848 849 case TIOCSFLAGS: 850 error = kauth_authorize_device_tty(l->l_cred, 851 KAUTH_DEVICE_TTY_PRIVSET, tp); 852 if (error) 853 break; 854 sc->sc_swflags = *(int *)data; 855 break; 856 857 case TIOCMSET: 858 case TIOCMBIS: 859 case TIOCMBIC: 860 tiocm_to_sscom(sc, cmd, *(int *)data); 861 break; 862 863 case TIOCMGET: 864 *(int *)data = sscom_to_tiocm(sc); 865 break; 866 867 default: 868 error = EPASSTHROUGH; 869 break; 870 } 871 872 SSCOM_UNLOCK(sc); 873 splx(s); 874 875 if (sscom_debug) 876 sscomstatus(sc, "sscomioctl "); 877 878 return error; 879 } 880 881 integrate void 882 sscom_schedrx(struct sscom_softc *sc) 883 { 884 885 sc->sc_rx_ready = 1; 886 887 /* Wake up the poller. */ 888 softint_schedule(sc->sc_si); 889 } 890 891 static void 892 sscom_break(struct sscom_softc *sc, int onoff) 893 { 894 895 if (onoff) 896 SET(sc->sc_ucon, UCON_SBREAK); 897 else 898 CLR(sc->sc_ucon, UCON_SBREAK); 899 900 if (!sc->sc_heldchange) { 901 if (sc->sc_tx_busy) { 902 sc->sc_heldtbc = sc->sc_tbc; 903 sc->sc_tbc = 0; 904 sc->sc_heldchange = 1; 905 } else 906 sscom_loadchannelregs(sc); 907 } 908 } 909 910 static void 911 sscom_modem(struct sscom_softc *sc, int onoff) 912 { 913 if (onoff) 914 SET(sc->sc_umcon, UMCON_DTR); 915 else 916 CLR(sc->sc_umcon, UMCON_DTR); 917 918 if (!sc->sc_heldchange) { 919 if (sc->sc_tx_busy) { 920 sc->sc_heldtbc = sc->sc_tbc; 921 sc->sc_tbc = 0; 922 sc->sc_heldchange = 1; 923 } else 924 sscom_loadchannelregs(sc); 925 } 926 } 927 928 static void 929 tiocm_to_sscom(struct sscom_softc *sc, u_long how, int ttybits) 930 { 931 u_char sscombits; 932 933 sscombits = 0; 934 if (ISSET(ttybits, TIOCM_DTR)) 935 sscombits = UMCON_DTR; 936 if (ISSET(ttybits, TIOCM_RTS)) 937 SET(sscombits, UMCON_RTS); 938 939 switch (how) { 940 case TIOCMBIC: 941 CLR(sc->sc_umcon, sscombits); 942 break; 943 944 case TIOCMBIS: 945 SET(sc->sc_umcon, sscombits); 946 break; 947 948 case TIOCMSET: 949 CLR(sc->sc_umcon, UMCON_DTR); 950 SET(sc->sc_umcon, sscombits); 951 break; 952 } 953 954 if (!sc->sc_heldchange) { 955 if (sc->sc_tx_busy) { 956 sc->sc_heldtbc = sc->sc_tbc; 957 sc->sc_tbc = 0; 958 sc->sc_heldchange = 1; 959 } else 960 sscom_loadchannelregs(sc); 961 } 962 } 963 964 static int 965 sscom_to_tiocm(struct sscom_softc *sc) 966 { 967 u_char sscombits; 968 int ttybits = 0; 969 970 sscombits = sc->sc_umcon; 971 #if 0 972 if (ISSET(sscombits, MCR_DTR)) 973 SET(ttybits, TIOCM_DTR); 974 #endif 975 if (ISSET(sscombits, UMCON_RTS)) 976 SET(ttybits, TIOCM_RTS); 977 978 sscombits = sc->sc_msts; 979 if (ISSET(sscombits, MSTS_DCD)) 980 SET(ttybits, TIOCM_CD); 981 if (ISSET(sscombits, MSTS_DSR)) 982 SET(ttybits, TIOCM_DSR); 983 if (ISSET(sscombits, MSTS_CTS)) 984 SET(ttybits, TIOCM_CTS); 985 986 if (sc->sc_ucon != 0) 987 SET(ttybits, TIOCM_LE); 988 989 return ttybits; 990 } 991 992 static int 993 cflag2lcr(tcflag_t cflag) 994 { 995 u_char lcr = ULCON_PARITY_NONE; 996 997 switch (cflag & (PARENB|PARODD)) { 998 case PARENB|PARODD: lcr = ULCON_PARITY_ODD; break; 999 case PARENB: lcr = ULCON_PARITY_EVEN; 1000 } 1001 1002 switch (ISSET(cflag, CSIZE)) { 1003 case CS5: 1004 SET(lcr, ULCON_LENGTH_5); 1005 break; 1006 case CS6: 1007 SET(lcr, ULCON_LENGTH_6); 1008 break; 1009 case CS7: 1010 SET(lcr, ULCON_LENGTH_7); 1011 break; 1012 case CS8: 1013 SET(lcr, ULCON_LENGTH_8); 1014 break; 1015 } 1016 if (ISSET(cflag, CSTOPB)) 1017 SET(lcr, ULCON_STOP); 1018 1019 return lcr; 1020 } 1021 1022 int 1023 sscomparam(struct tty *tp, struct termios *t) 1024 { 1025 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(tp->t_dev)); 1026 int ospeed; 1027 u_char lcr; 1028 int s; 1029 1030 if (SSCOM_ISALIVE(sc) == 0) 1031 return EIO; 1032 1033 ospeed = sscomspeed(t->c_ospeed, sc->sc_frequency); 1034 1035 /* Check requested parameters. */ 1036 if (ospeed < 0) 1037 return EINVAL; 1038 if (t->c_ispeed && t->c_ispeed != t->c_ospeed) 1039 return EINVAL; 1040 1041 /* 1042 * For the console, always force CLOCAL and !HUPCL, so that the port 1043 * is always active. 1044 */ 1045 if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) || 1046 ISSET(sc->sc_hwflags, SSCOM_HW_CONSOLE)) { 1047 SET(t->c_cflag, CLOCAL); 1048 CLR(t->c_cflag, HUPCL); 1049 } 1050 1051 /* 1052 * If there were no changes, don't do anything. This avoids dropping 1053 * input and improves performance when all we did was frob things like 1054 * VMIN and VTIME. 1055 */ 1056 if (tp->t_ospeed == t->c_ospeed && 1057 tp->t_cflag == t->c_cflag) 1058 return 0; 1059 1060 lcr = cflag2lcr(t->c_cflag); 1061 1062 s = splserial(); 1063 SSCOM_LOCK(sc); 1064 1065 sc->sc_ulcon = lcr; 1066 1067 /* 1068 * If we're not in a mode that assumes a connection is present, then 1069 * ignore carrier changes. 1070 */ 1071 if (ISSET(t->c_cflag, CLOCAL | MDMBUF)) 1072 sc->sc_msr_dcd = 0; 1073 else 1074 sc->sc_msr_dcd = MSTS_DCD; 1075 1076 /* 1077 * Set the flow control pins depending on the current flow control 1078 * mode. 1079 */ 1080 if (ISSET(t->c_cflag, CRTSCTS)) { 1081 sc->sc_mcr_dtr = UMCON_DTR; 1082 sc->sc_mcr_rts = UMCON_RTS; 1083 sc->sc_msr_cts = MSTS_CTS; 1084 } 1085 else if (ISSET(t->c_cflag, MDMBUF)) { 1086 /* 1087 * For DTR/DCD flow control, make sure we don't toggle DTR for 1088 * carrier detection. 1089 */ 1090 sc->sc_mcr_dtr = 0; 1091 sc->sc_mcr_rts = UMCON_DTR; 1092 sc->sc_msr_cts = MSTS_DCD; 1093 } 1094 else { 1095 /* 1096 * If no flow control, then always set RTS. This will make 1097 * the other side happy if it mistakenly thinks we're doing 1098 * RTS/CTS flow control. 1099 */ 1100 sc->sc_mcr_dtr = UMCON_DTR | UMCON_RTS; 1101 sc->sc_mcr_rts = 0; 1102 sc->sc_msr_cts = 0; 1103 if (ISSET(sc->sc_umcon, UMCON_DTR)) 1104 SET(sc->sc_umcon, UMCON_RTS); 1105 else 1106 CLR(sc->sc_umcon, UMCON_RTS); 1107 } 1108 sc->sc_msr_mask = sc->sc_msr_cts | sc->sc_msr_dcd; 1109 1110 if (ospeed == 0) 1111 CLR(sc->sc_umcon, sc->sc_mcr_dtr); 1112 else 1113 SET(sc->sc_umcon, sc->sc_mcr_dtr); 1114 1115 sc->sc_ubrdiv = ospeed; 1116 1117 /* And copy to tty. */ 1118 tp->t_ispeed = 0; 1119 tp->t_ospeed = t->c_ospeed; 1120 tp->t_cflag = t->c_cflag; 1121 1122 if (!sc->sc_heldchange) { 1123 if (sc->sc_tx_busy) { 1124 sc->sc_heldtbc = sc->sc_tbc; 1125 sc->sc_tbc = 0; 1126 sc->sc_heldchange = 1; 1127 } else 1128 sscom_loadchannelregs(sc); 1129 } 1130 1131 if (!ISSET(t->c_cflag, CHWFLOW)) { 1132 /* Disable the high water mark. */ 1133 sc->sc_r_hiwat = 0; 1134 sc->sc_r_lowat = 0; 1135 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1136 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1137 sscom_schedrx(sc); 1138 } 1139 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 1140 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 1141 sscom_hwiflow(sc); 1142 } 1143 } else { 1144 sc->sc_r_hiwat = sscom_rbuf_hiwat; 1145 sc->sc_r_lowat = sscom_rbuf_lowat; 1146 } 1147 1148 SSCOM_UNLOCK(sc); 1149 splx(s); 1150 1151 /* 1152 * Update the tty layer's idea of the carrier bit, in case we changed 1153 * CLOCAL or MDMBUF. We don't hang up here; we only do that by 1154 * explicit request. 1155 */ 1156 (void) (*tp->t_linesw->l_modem)(tp, ISSET(sc->sc_msts, MSTS_DCD)); 1157 1158 if (sscom_debug) 1159 sscomstatus(sc, "sscomparam "); 1160 1161 if (!ISSET(t->c_cflag, CHWFLOW)) { 1162 if (sc->sc_tx_stopped) { 1163 sc->sc_tx_stopped = 0; 1164 sscomstart(tp); 1165 } 1166 } 1167 1168 return 0; 1169 } 1170 1171 static void 1172 sscom_iflush(struct sscom_softc *sc) 1173 { 1174 bus_space_tag_t iot = sc->sc_iot; 1175 bus_space_handle_t ioh = sc->sc_ioh; 1176 int timo; 1177 1178 1179 timo = 50000; 1180 /* flush any pending I/O */ 1181 while ( sscom_rxrdy(iot, ioh) && --timo) 1182 (void)sscom_getc(iot,ioh); 1183 #ifdef DIAGNOSTIC 1184 if (!timo) 1185 printf("%s: sscom_iflush timeout\n", sc->sc_dev->dv_xname); 1186 #endif 1187 } 1188 1189 static void 1190 sscom_loadchannelregs(struct sscom_softc *sc) 1191 { 1192 bus_space_tag_t iot = sc->sc_iot; 1193 bus_space_handle_t ioh = sc->sc_ioh; 1194 1195 /* XXXXX necessary? */ 1196 sscom_iflush(sc); 1197 1198 bus_space_write_2(iot, ioh, SSCOM_UCON, 0); 1199 1200 #if 0 1201 if (ISSET(sc->sc_hwflags, COM_HW_FLOW)) { 1202 bus_space_write_1(iot, ioh, com_lcr, LCR_EERS); 1203 bus_space_write_1(iot, ioh, com_efr, sc->sc_efr); 1204 } 1205 #endif 1206 1207 bus_space_write_2(iot, ioh, SSCOM_UBRDIV, sc->sc_ubrdiv); 1208 bus_space_write_1(iot, ioh, SSCOM_ULCON, sc->sc_ulcon); 1209 sc->set_modem_control(sc); 1210 bus_space_write_2(iot, ioh, SSCOM_UCON, sc->sc_ucon); 1211 } 1212 1213 static int 1214 sscomhwiflow(struct tty *tp, int block) 1215 { 1216 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(tp->t_dev)); 1217 int s; 1218 1219 if (SSCOM_ISALIVE(sc) == 0) 1220 return 0; 1221 1222 if (sc->sc_mcr_rts == 0) 1223 return 0; 1224 1225 s = splserial(); 1226 SSCOM_LOCK(sc); 1227 1228 if (block) { 1229 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1230 SET(sc->sc_rx_flags, RX_TTY_BLOCKED); 1231 sscom_hwiflow(sc); 1232 } 1233 } else { 1234 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1235 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1236 sscom_schedrx(sc); 1237 } 1238 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1239 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED); 1240 sscom_hwiflow(sc); 1241 } 1242 } 1243 1244 SSCOM_UNLOCK(sc); 1245 splx(s); 1246 return 1; 1247 } 1248 1249 /* 1250 * (un)block input via hw flowcontrol 1251 */ 1252 static void 1253 sscom_hwiflow(struct sscom_softc *sc) 1254 { 1255 if (sc->sc_mcr_rts == 0) 1256 return; 1257 1258 if (ISSET(sc->sc_rx_flags, RX_ANY_BLOCK)) { 1259 CLR(sc->sc_umcon, sc->sc_mcr_rts); 1260 CLR(sc->sc_mcr_active, sc->sc_mcr_rts); 1261 } else { 1262 SET(sc->sc_umcon, sc->sc_mcr_rts); 1263 SET(sc->sc_mcr_active, sc->sc_mcr_rts); 1264 } 1265 sc->set_modem_control(sc); 1266 } 1267 1268 1269 void 1270 sscomstart(struct tty *tp) 1271 { 1272 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(tp->t_dev)); 1273 int s; 1274 1275 if (SSCOM_ISALIVE(sc) == 0) 1276 return; 1277 1278 s = spltty(); 1279 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 1280 goto out; 1281 if (sc->sc_tx_stopped) 1282 goto out; 1283 if (!ttypull(tp)) 1284 goto out; 1285 1286 /* Grab the first contiguous region of buffer space. */ 1287 { 1288 u_char *tba; 1289 int tbc; 1290 1291 tba = tp->t_outq.c_cf; 1292 tbc = ndqb(&tp->t_outq, 0); 1293 1294 (void)splserial(); 1295 SSCOM_LOCK(sc); 1296 1297 sc->sc_tba = tba; 1298 sc->sc_tbc = tbc; 1299 } 1300 1301 SET(tp->t_state, TS_BUSY); 1302 sc->sc_tx_busy = 1; 1303 1304 /* Output the first chunk of the contiguous buffer. */ 1305 sscom_output_chunk(sc); 1306 1307 /* Enable transmit completion interrupts if necessary. */ 1308 if ((sc->sc_hwflags & SSCOM_HW_TXINT) == 0) 1309 sscom_enable_txint(sc); 1310 1311 SSCOM_UNLOCK(sc); 1312 out: 1313 splx(s); 1314 return; 1315 } 1316 1317 /* 1318 * Stop output on a line. 1319 */ 1320 void 1321 sscomstop(struct tty *tp, int flag) 1322 { 1323 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(tp->t_dev)); 1324 int s; 1325 1326 s = splserial(); 1327 SSCOM_LOCK(sc); 1328 if (ISSET(tp->t_state, TS_BUSY)) { 1329 /* Stop transmitting at the next chunk. */ 1330 sc->sc_tbc = 0; 1331 sc->sc_heldtbc = 0; 1332 if (!ISSET(tp->t_state, TS_TTSTOP)) 1333 SET(tp->t_state, TS_FLUSH); 1334 } 1335 SSCOM_UNLOCK(sc); 1336 splx(s); 1337 } 1338 1339 void 1340 sscomdiag(void *arg) 1341 { 1342 struct sscom_softc *sc = arg; 1343 int overflows, floods; 1344 int s; 1345 1346 s = splserial(); 1347 SSCOM_LOCK(sc); 1348 overflows = sc->sc_overflows; 1349 sc->sc_overflows = 0; 1350 floods = sc->sc_floods; 1351 sc->sc_floods = 0; 1352 sc->sc_errors = 0; 1353 SSCOM_UNLOCK(sc); 1354 splx(s); 1355 1356 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1357 sc->sc_dev->dv_xname, 1358 overflows, overflows == 1 ? "" : "s", 1359 floods, floods == 1 ? "" : "s"); 1360 } 1361 1362 integrate void 1363 sscom_rxsoft(struct sscom_softc *sc, struct tty *tp) 1364 { 1365 int (*rint) (int, struct tty *) = tp->t_linesw->l_rint; 1366 u_char *get, *end; 1367 u_int cc, scc; 1368 u_char rsr; 1369 int code; 1370 int s; 1371 1372 end = sc->sc_ebuf; 1373 get = sc->sc_rbget; 1374 scc = cc = sscom_rbuf_size - sc->sc_rbavail; 1375 1376 if (cc == sscom_rbuf_size) { 1377 sc->sc_floods++; 1378 if (sc->sc_errors++ == 0) 1379 callout_reset(&sc->sc_diag_callout, 60 * hz, 1380 sscomdiag, sc); 1381 } 1382 1383 while (cc) { 1384 code = get[0]; 1385 rsr = get[1]; 1386 if (rsr) { 1387 if (ISSET(rsr, UERSTAT_OVERRUN)) { 1388 sc->sc_overflows++; 1389 if (sc->sc_errors++ == 0) 1390 callout_reset(&sc->sc_diag_callout, 1391 60 * hz, sscomdiag, sc); 1392 } 1393 if (ISSET(rsr, UERSTAT_BREAK | UERSTAT_FRAME)) 1394 SET(code, TTY_FE); 1395 if (ISSET(rsr, UERSTAT_PARITY)) 1396 SET(code, TTY_PE); 1397 } 1398 if ((*rint)(code, tp) == -1) { 1399 /* 1400 * The line discipline's buffer is out of space. 1401 */ 1402 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1403 /* 1404 * We're either not using flow control, or the 1405 * line discipline didn't tell us to block for 1406 * some reason. Either way, we have no way to 1407 * know when there's more space available, so 1408 * just drop the rest of the data. 1409 */ 1410 get += cc << 1; 1411 if (get >= end) 1412 get -= sscom_rbuf_size << 1; 1413 cc = 0; 1414 } else { 1415 /* 1416 * Don't schedule any more receive processing 1417 * until the line discipline tells us there's 1418 * space available (through sscomhwiflow()). 1419 * Leave the rest of the data in the input 1420 * buffer. 1421 */ 1422 SET(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1423 } 1424 break; 1425 } 1426 get += 2; 1427 if (get >= end) 1428 get = sc->sc_rbuf; 1429 cc--; 1430 } 1431 1432 if (cc != scc) { 1433 sc->sc_rbget = get; 1434 s = splserial(); 1435 SSCOM_LOCK(sc); 1436 1437 cc = sc->sc_rbavail += scc - cc; 1438 /* Buffers should be ok again, release possible block. */ 1439 if (cc >= sc->sc_r_lowat) { 1440 if (ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1441 CLR(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1442 sscom_enable_rxint(sc); 1443 sc->sc_ucon |= UCON_ERRINT; 1444 bus_space_write_2(sc->sc_iot, sc->sc_ioh, SSCOM_UCON, 1445 sc->sc_ucon); 1446 1447 } 1448 if (ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED)) { 1449 CLR(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1450 sscom_hwiflow(sc); 1451 } 1452 } 1453 SSCOM_UNLOCK(sc); 1454 splx(s); 1455 } 1456 } 1457 1458 integrate void 1459 sscom_txsoft(struct sscom_softc *sc, struct tty *tp) 1460 { 1461 1462 CLR(tp->t_state, TS_BUSY); 1463 if (ISSET(tp->t_state, TS_FLUSH)) 1464 CLR(tp->t_state, TS_FLUSH); 1465 else 1466 ndflush(&tp->t_outq, (int)(sc->sc_tba - tp->t_outq.c_cf)); 1467 (*tp->t_linesw->l_start)(tp); 1468 } 1469 1470 integrate void 1471 sscom_stsoft(struct sscom_softc *sc, struct tty *tp) 1472 { 1473 u_char msr, delta; 1474 int s; 1475 1476 s = splserial(); 1477 SSCOM_LOCK(sc); 1478 msr = sc->sc_msts; 1479 delta = sc->sc_msr_delta; 1480 sc->sc_msr_delta = 0; 1481 SSCOM_UNLOCK(sc); 1482 splx(s); 1483 1484 if (ISSET(delta, sc->sc_msr_dcd)) { 1485 /* 1486 * Inform the tty layer that carrier detect changed. 1487 */ 1488 (void) (*tp->t_linesw->l_modem)(tp, ISSET(msr, MSTS_DCD)); 1489 } 1490 1491 if (ISSET(delta, sc->sc_msr_cts)) { 1492 /* Block or unblock output according to flow control. */ 1493 if (ISSET(msr, sc->sc_msr_cts)) { 1494 sc->sc_tx_stopped = 0; 1495 (*tp->t_linesw->l_start)(tp); 1496 } else { 1497 sc->sc_tx_stopped = 1; 1498 } 1499 } 1500 1501 if (sscom_debug) 1502 sscomstatus(sc, "sscom_stsoft"); 1503 } 1504 1505 void 1506 sscomsoft(void *arg) 1507 { 1508 struct sscom_softc *sc = arg; 1509 struct tty *tp; 1510 1511 if (SSCOM_ISALIVE(sc) == 0) 1512 return; 1513 1514 { 1515 tp = sc->sc_tty; 1516 1517 if (sc->sc_rx_ready) { 1518 sc->sc_rx_ready = 0; 1519 sscom_rxsoft(sc, tp); 1520 } 1521 1522 if (sc->sc_st_check) { 1523 sc->sc_st_check = 0; 1524 sscom_stsoft(sc, tp); 1525 } 1526 1527 if (sc->sc_tx_done) { 1528 sc->sc_tx_done = 0; 1529 sscom_txsoft(sc, tp); 1530 } 1531 } 1532 } 1533 1534 1535 int 1536 sscomrxintr(void *arg) 1537 { 1538 struct sscom_softc *sc = arg; 1539 bus_space_tag_t iot = sc->sc_iot; 1540 bus_space_handle_t ioh = sc->sc_ioh; 1541 u_char *put, *end; 1542 u_int cc; 1543 1544 if (SSCOM_ISALIVE(sc) == 0) 1545 return 0; 1546 1547 SSCOM_LOCK(sc); 1548 1549 end = sc->sc_ebuf; 1550 put = sc->sc_rbput; 1551 cc = sc->sc_rbavail; 1552 1553 do { 1554 u_char msts, delta; 1555 u_char uerstat; 1556 uint16_t ufstat; 1557 1558 ufstat = bus_space_read_2(iot, ioh, SSCOM_UFSTAT); 1559 1560 /* XXX: break interrupt with no character? */ 1561 1562 if ( (ufstat & (UFSTAT_RXCOUNT|UFSTAT_RXFULL)) && 1563 !ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1564 1565 while (cc > 0) { 1566 int cn_trapped = 0; 1567 1568 /* get status and received character. 1569 read status register first */ 1570 uerstat = sscom_geterr(iot, ioh); 1571 put[0] = sscom_getc(iot, ioh); 1572 1573 if (ISSET(uerstat, UERSTAT_BREAK)) { 1574 int con_trapped = 0; 1575 cn_check_magic(sc->sc_tty->t_dev, 1576 CNC_BREAK, sscom_cnm_state); 1577 if (con_trapped) 1578 continue; 1579 #if defined(KGDB) 1580 if (ISSET(sc->sc_hwflags, 1581 SSCOM_HW_KGDB)) { 1582 kgdb_connect(1); 1583 continue; 1584 } 1585 #endif 1586 } 1587 1588 put[1] = uerstat; 1589 cn_check_magic(sc->sc_tty->t_dev, 1590 put[0], sscom_cnm_state); 1591 if (!cn_trapped) { 1592 put += 2; 1593 if (put >= end) 1594 put = sc->sc_rbuf; 1595 cc--; 1596 } 1597 1598 ufstat = bus_space_read_2(iot, ioh, SSCOM_UFSTAT); 1599 if ( (ufstat & (UFSTAT_RXFULL|UFSTAT_RXCOUNT)) == 0 ) 1600 break; 1601 } 1602 1603 /* 1604 * Current string of incoming characters ended because 1605 * no more data was available or we ran out of space. 1606 * Schedule a receive event if any data was received. 1607 * If we're out of space, turn off receive interrupts. 1608 */ 1609 sc->sc_rbput = put; 1610 sc->sc_rbavail = cc; 1611 if (!ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) 1612 sc->sc_rx_ready = 1; 1613 1614 /* 1615 * See if we are in danger of overflowing a buffer. If 1616 * so, use hardware flow control to ease the pressure. 1617 */ 1618 if (!ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED) && 1619 cc < sc->sc_r_hiwat) { 1620 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1621 sscom_hwiflow(sc); 1622 } 1623 1624 /* 1625 * If we're out of space, disable receive interrupts 1626 * until the queue has drained a bit. 1627 */ 1628 if (!cc) { 1629 SET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1630 sscom_disable_rxint(sc); 1631 sc->sc_ucon &= ~UCON_ERRINT; 1632 bus_space_write_2(iot, ioh, SSCOM_UCON, sc->sc_ucon); 1633 } 1634 } 1635 1636 1637 msts = sc->read_modem_status(sc); 1638 delta = msts ^ sc->sc_msts; 1639 sc->sc_msts = msts; 1640 1641 #ifdef notyet 1642 /* 1643 * Pulse-per-second (PSS) signals on edge of DCD? 1644 * Process these even if line discipline is ignoring DCD. 1645 */ 1646 if (delta & sc->sc_ppsmask) { 1647 struct timeval tv; 1648 if ((msr & sc->sc_ppsmask) == sc->sc_ppsassert) { 1649 /* XXX nanotime() */ 1650 microtime(&tv); 1651 TIMEVAL_TO_TIMESPEC(&tv, 1652 &sc->ppsinfo.assert_timestamp); 1653 if (sc->ppsparam.mode & PPS_OFFSETASSERT) { 1654 timespecadd(&sc->ppsinfo.assert_timestamp, 1655 &sc->ppsparam.assert_offset, 1656 &sc->ppsinfo.assert_timestamp); 1657 } 1658 1659 #ifdef PPS_SYNC 1660 if (sc->ppsparam.mode & PPS_HARDPPSONASSERT) 1661 hardpps(&tv, tv.tv_usec); 1662 #endif 1663 sc->ppsinfo.assert_sequence++; 1664 sc->ppsinfo.current_mode = sc->ppsparam.mode; 1665 1666 } else if ((msr & sc->sc_ppsmask) == sc->sc_ppsclear) { 1667 /* XXX nanotime() */ 1668 microtime(&tv); 1669 TIMEVAL_TO_TIMESPEC(&tv, 1670 &sc->ppsinfo.clear_timestamp); 1671 if (sc->ppsparam.mode & PPS_OFFSETCLEAR) { 1672 timespecadd(&sc->ppsinfo.clear_timestamp, 1673 &sc->ppsparam.clear_offset, 1674 &sc->ppsinfo.clear_timestamp); 1675 } 1676 1677 #ifdef PPS_SYNC 1678 if (sc->ppsparam.mode & PPS_HARDPPSONCLEAR) 1679 hardpps(&tv, tv.tv_usec); 1680 #endif 1681 sc->ppsinfo.clear_sequence++; 1682 sc->ppsinfo.current_mode = sc->ppsparam.mode; 1683 } 1684 } 1685 #endif 1686 1687 /* 1688 * Process normal status changes 1689 */ 1690 if (ISSET(delta, sc->sc_msr_mask)) { 1691 SET(sc->sc_msr_delta, delta); 1692 1693 /* 1694 * Stop output immediately if we lose the output 1695 * flow control signal or carrier detect. 1696 */ 1697 if (ISSET(~msts, sc->sc_msr_mask)) { 1698 sc->sc_tbc = 0; 1699 sc->sc_heldtbc = 0; 1700 #ifdef SSCOM_DEBUG 1701 if (sscom_debug) 1702 sscomstatus(sc, "sscomintr "); 1703 #endif 1704 } 1705 1706 sc->sc_st_check = 1; 1707 } 1708 1709 /* 1710 * Done handling any receive interrupts. 1711 */ 1712 1713 /* 1714 * If we've delayed a parameter change, do it 1715 * now, and restart * output. 1716 */ 1717 if ((ufstat & UFSTAT_TXCOUNT) == 0) { 1718 /* XXX: we should check transmitter empty also */ 1719 1720 if (sc->sc_heldchange) { 1721 sscom_loadchannelregs(sc); 1722 sc->sc_heldchange = 0; 1723 sc->sc_tbc = sc->sc_heldtbc; 1724 sc->sc_heldtbc = 0; 1725 } 1726 } 1727 1728 1729 } while (0); 1730 1731 SSCOM_UNLOCK(sc); 1732 1733 /* Wake up the poller. */ 1734 softint_schedule(sc->sc_si); 1735 1736 #ifdef RND_COM 1737 rnd_add_uint32(&sc->rnd_source, iir | rsr); 1738 #endif 1739 1740 return 1; 1741 } 1742 1743 int 1744 sscomtxintr(void *arg) 1745 { 1746 struct sscom_softc *sc = arg; 1747 bus_space_tag_t iot = sc->sc_iot; 1748 bus_space_handle_t ioh = sc->sc_ioh; 1749 uint16_t ufstat; 1750 1751 if (SSCOM_ISALIVE(sc) == 0) 1752 return 0; 1753 1754 SSCOM_LOCK(sc); 1755 1756 ufstat = bus_space_read_2(iot, ioh, SSCOM_UFSTAT); 1757 1758 /* 1759 * If we've delayed a parameter change, do it 1760 * now, and restart * output. 1761 */ 1762 if (sc->sc_heldchange && (ufstat & UFSTAT_TXCOUNT) == 0) { 1763 /* XXX: we should check transmitter empty also */ 1764 sscom_loadchannelregs(sc); 1765 sc->sc_heldchange = 0; 1766 sc->sc_tbc = sc->sc_heldtbc; 1767 sc->sc_heldtbc = 0; 1768 } 1769 1770 /* 1771 * See if data can be transmitted as well. Schedule tx 1772 * done event if no data left and tty was marked busy. 1773 */ 1774 if (!ISSET(ufstat,UFSTAT_TXFULL)) { 1775 /* 1776 * Output the next chunk of the contiguous 1777 * buffer, if any. 1778 */ 1779 if (sc->sc_tbc > 0) { 1780 __sscom_output_chunk(sc, ufstat); 1781 } 1782 else { 1783 /* 1784 * Disable transmit sscompletion 1785 * interrupts if necessary. 1786 */ 1787 if (sc->sc_hwflags & SSCOM_HW_TXINT) 1788 sscom_disable_txint(sc); 1789 if (sc->sc_tx_busy) { 1790 sc->sc_tx_busy = 0; 1791 sc->sc_tx_done = 1; 1792 } 1793 } 1794 } 1795 1796 SSCOM_UNLOCK(sc); 1797 1798 /* Wake up the poller. */ 1799 softint_schedule(sc->sc_si); 1800 1801 #ifdef RND_COM 1802 rnd_add_uint32(&sc->rnd_source, iir | rsr); 1803 #endif 1804 1805 return 1; 1806 } 1807 1808 1809 #if defined(KGDB) || defined(SSCOM0CONSOLE) || defined(SSCOM1CONSOLE) 1810 /* 1811 * Initialize UART for use as console or KGDB line. 1812 */ 1813 static int 1814 sscom_init(bus_space_tag_t iot, const struct sscom_uart_info *config, 1815 int rate, int frequency, tcflag_t cflag, bus_space_handle_t *iohp) 1816 { 1817 bus_space_handle_t ioh; 1818 bus_addr_t iobase = config->iobase; 1819 1820 if (bus_space_map(iot, iobase, SSCOM_SIZE, 0, &ioh)) 1821 return ENOMEM; /* ??? */ 1822 1823 bus_space_write_2(iot, ioh, SSCOM_UCON, 0); 1824 bus_space_write_1(iot, ioh, SSCOM_UFCON, 1825 #ifdef SSCOM_S3C2440 1826 UFCON_TXTRIGGER_16 | UFCON_RXTRIGGER_16 | 1827 #else 1828 UFCON_TXTRIGGER_8 | UFCON_RXTRIGGER_8 | 1829 #endif 1830 UFCON_TXFIFO_RESET | UFCON_RXFIFO_RESET | 1831 UFCON_FIFO_ENABLE ); 1832 /* tx/rx fifo reset are auto-cleared */ 1833 1834 rate = sscomspeed(rate, frequency); 1835 bus_space_write_2(iot, ioh, SSCOM_UBRDIV, rate); 1836 bus_space_write_2(iot, ioh, SSCOM_ULCON, cflag2lcr(cflag)); 1837 1838 /* enable UART */ 1839 bus_space_write_2(iot, ioh, SSCOM_UCON, 1840 UCON_TXMODE_INT|UCON_RXMODE_INT); 1841 bus_space_write_2(iot, ioh, SSCOM_UMCON, UMCON_RTS); 1842 1843 *iohp = ioh; 1844 return 0; 1845 } 1846 1847 #endif 1848 1849 #if defined(SSCOM0CONSOLE) || defined(SSCOM1CONSOLE) 1850 /* 1851 * Following are all routines needed for SSCOM to act as console 1852 */ 1853 struct consdev sscomcons = { 1854 NULL, NULL, sscomcngetc, sscomcnputc, sscomcnpollc, NULL, 1855 NULL, NULL, NODEV, CN_NORMAL 1856 }; 1857 1858 1859 int 1860 sscom_cnattach(bus_space_tag_t iot, const struct sscom_uart_info *config, 1861 int rate, int frequency, tcflag_t cflag) 1862 { 1863 int res; 1864 1865 res = sscom_init(iot, config, rate, frequency, cflag, &sscomconsioh); 1866 if (res) 1867 return res; 1868 1869 cn_tab = &sscomcons; 1870 cn_init_magic(&sscom_cnm_state); 1871 cn_set_magic("\047\001"); /* default magic is BREAK */ 1872 1873 sscomconstag = iot; 1874 sscomconsunit = config->unit; 1875 sscomconsrate = rate; 1876 sscomconscflag = cflag; 1877 1878 return 0; 1879 } 1880 1881 void 1882 sscom_cndetach(void) 1883 { 1884 bus_space_unmap(sscomconstag, sscomconsioh, SSCOM_SIZE); 1885 sscomconstag = NULL; 1886 1887 cn_tab = NULL; 1888 } 1889 1890 /* 1891 * The read-ahead code is so that you can detect pending in-band 1892 * cn_magic in polled mode while doing output rather than having to 1893 * wait until the kernel decides it needs input. 1894 */ 1895 1896 #define MAX_READAHEAD 20 1897 static int sscom_readahead[MAX_READAHEAD]; 1898 static int sscom_readaheadcount = 0; 1899 1900 int 1901 sscomcngetc(dev_t dev) 1902 { 1903 int s = splserial(); 1904 u_char stat, c; 1905 1906 /* got a character from reading things earlier */ 1907 if (sscom_readaheadcount > 0) { 1908 int i; 1909 1910 c = sscom_readahead[0]; 1911 for (i = 1; i < sscom_readaheadcount; i++) { 1912 sscom_readahead[i-1] = sscom_readahead[i]; 1913 } 1914 sscom_readaheadcount--; 1915 splx(s); 1916 return c; 1917 } 1918 1919 /* block until a character becomes available */ 1920 while (!sscom_rxrdy(sscomconstag, sscomconsioh)) 1921 ; 1922 1923 c = sscom_getc(sscomconstag, sscomconsioh); 1924 stat = sscom_geterr(sscomconstag, sscomconsioh); 1925 { 1926 int cn_trapped = 0; /* unused */ 1927 #ifdef DDB 1928 extern int db_active; 1929 if (!db_active) 1930 #endif 1931 cn_check_magic(dev, c, sscom_cnm_state); 1932 } 1933 splx(s); 1934 return c; 1935 } 1936 1937 /* 1938 * Console kernel output character routine. 1939 */ 1940 void 1941 sscomcnputc(dev_t dev, int c) 1942 { 1943 int s = splserial(); 1944 int timo; 1945 1946 int cin, stat; 1947 if (sscom_readaheadcount < MAX_READAHEAD && 1948 sscom_rxrdy(sscomconstag, sscomconsioh)) { 1949 1950 int cn_trapped = 0; 1951 cin = sscom_getc(sscomconstag, sscomconsioh); 1952 stat = sscom_geterr(sscomconstag, sscomconsioh); 1953 cn_check_magic(dev, cin, sscom_cnm_state); 1954 sscom_readahead[sscom_readaheadcount++] = cin; 1955 } 1956 1957 /* wait for any pending transmission to finish */ 1958 timo = 150000; 1959 while (ISSET(bus_space_read_2(sscomconstag, sscomconsioh, SSCOM_UFSTAT), 1960 UFSTAT_TXFULL) && --timo) 1961 continue; 1962 1963 bus_space_write_1(sscomconstag, sscomconsioh, SSCOM_UTXH, c); 1964 SSCOM_BARRIER(sscomconstag, sscomconsioh, BR | BW); 1965 1966 #if 0 1967 /* wait for this transmission to complete */ 1968 timo = 1500000; 1969 while (!ISSET(bus_space_read_1(sscomconstag, sscomconsioh, SSCOM_UTRSTAT), 1970 UTRSTAT_TXEMPTY) && --timo) 1971 continue; 1972 #endif 1973 splx(s); 1974 } 1975 1976 void 1977 sscomcnpollc(dev_t dev, int on) 1978 { 1979 1980 } 1981 1982 #endif /* SSCOM0CONSOLE||SSCOM1CONSOLE */ 1983 1984 #ifdef KGDB 1985 int 1986 sscom_kgdb_attach(bus_space_tag_t iot, const struct sscom_uart_info *config, 1987 int rate, int frequency, tcflag_t cflag) 1988 { 1989 int res; 1990 1991 if (iot == sscomconstag && config->unit == sscomconsunit) { 1992 printf( "console==kgdb_port (%d): kgdb disabled\n", sscomconsunit); 1993 return EBUSY; /* cannot share with console */ 1994 } 1995 1996 res = sscom_init(iot, config, rate, frequency, cflag, &sscom_kgdb_ioh); 1997 if (res) 1998 return res; 1999 2000 kgdb_attach(sscom_kgdb_getc, sscom_kgdb_putc, NULL); 2001 kgdb_dev = 123; /* unneeded, only to satisfy some tests */ 2002 2003 sscom_kgdb_iot = iot; 2004 sscom_kgdb_unit = config->unit; 2005 2006 return 0; 2007 } 2008 2009 /* ARGSUSED */ 2010 int 2011 sscom_kgdb_getc(void *arg) 2012 { 2013 int c, stat; 2014 2015 /* block until a character becomes available */ 2016 while (!sscom_rxrdy(sscom_kgdb_iot, sscom_kgdb_ioh)) 2017 ; 2018 2019 c = sscom_getc(sscom_kgdb_iot, sscom_kgdb_ioh); 2020 stat = sscom_geterr(sscom_kgdb_iot, sscom_kgdb_ioh); 2021 2022 return c; 2023 } 2024 2025 /* ARGSUSED */ 2026 void 2027 sscom_kgdb_putc(void *arg, int c) 2028 { 2029 int timo; 2030 2031 /* wait for any pending transmission to finish */ 2032 timo = 150000; 2033 while (ISSET(bus_space_read_2(sscom_kgdb_iot, sscom_kgdb_ioh, 2034 SSCOM_UFSTAT), UFSTAT_TXFULL) && --timo) 2035 continue; 2036 2037 bus_space_write_1(sscom_kgdb_iot, sscom_kgdb_ioh, SSCOM_UTXH, c); 2038 SSCOM_BARRIER(sscom_kgdb_iot, sscom_kgdb_ioh, BR | BW); 2039 2040 #if 0 2041 /* wait for this transmission to complete */ 2042 timo = 1500000; 2043 while (!ISSET(bus_space_read_1(sscom_kgdb_iot, sscom_kgdb_ioh, 2044 SSCOM_UTRSTAT), UTRSTAT_TXEMPTY) && --timo) 2045 continue; 2046 #endif 2047 } 2048 #endif /* KGDB */ 2049 2050 /* helper function to identify the sscom ports used by 2051 console or KGDB (and not yet autoconf attached) */ 2052 int 2053 sscom_is_console(bus_space_tag_t iot, int unit, 2054 bus_space_handle_t *ioh) 2055 { 2056 bus_space_handle_t help; 2057 2058 if (!sscomconsattached && 2059 iot == sscomconstag && unit == sscomconsunit) 2060 help = sscomconsioh; 2061 #ifdef KGDB 2062 else if (!sscom_kgdb_attached && 2063 iot == sscom_kgdb_iot && unit == sscom_kgdb_unit) 2064 help = sscom_kgdb_ioh; 2065 #endif 2066 else 2067 return 0; 2068 2069 if (ioh) 2070 *ioh = help; 2071 return 1; 2072 } 2073
Indexes created Sun Sep 28 16:09:52 GMT 2025