sscom.c revision 1.29
1 /* $NetBSD: sscom.c,v 1.29 2008/06/11 22:37:21 cegger 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 1.29 2008/06/11 22:37:21 cegger 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 #if NRND > 0 && defined(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/user.h> 133 #include <sys/conf.h> 134 #include <sys/file.h> 135 #include <sys/uio.h> 136 #include <sys/kernel.h> 137 #include <sys/syslog.h> 138 #include <sys/types.h> 139 #include <sys/device.h> 140 #include <sys/malloc.h> 141 #include <sys/timepps.h> 142 #include <sys/vnode.h> 143 #include <sys/kauth.h> 144 #include <sys/intr.h> 145 #include <sys/bus.h> 146 147 #include <arm/s3c2xx0/s3c2xx0reg.h> 148 #include <arm/s3c2xx0/s3c2xx0var.h> 149 #if defined(SSCOM_S3C2410) || defined(SSCOM_S3C2400) 150 #include <arm/s3c2xx0/s3c24x0reg.h> 151 #elif defined(SSCOM_S3C2800) 152 #include <arm/s3c2xx0/s3c2800reg.h> 153 #endif 154 #include <arm/s3c2xx0/sscom_var.h> 155 #include <dev/cons.h> 156 157 dev_type_open(sscomopen); 158 dev_type_close(sscomclose); 159 dev_type_read(sscomread); 160 dev_type_write(sscomwrite); 161 dev_type_ioctl(sscomioctl); 162 dev_type_stop(sscomstop); 163 dev_type_tty(sscomtty); 164 dev_type_poll(sscompoll); 165 166 int sscomcngetc (dev_t); 167 void sscomcnputc (dev_t, int); 168 void sscomcnpollc (dev_t, int); 169 170 #define integrate static inline 171 void sscomsoft (void *); 172 173 integrate void sscom_rxsoft (struct sscom_softc *, struct tty *); 174 integrate void sscom_txsoft (struct sscom_softc *, struct tty *); 175 integrate void sscom_stsoft (struct sscom_softc *, struct tty *); 176 integrate void sscom_schedrx (struct sscom_softc *); 177 static void sscom_modem(struct sscom_softc *, int); 178 static void sscom_break(struct sscom_softc *, int); 179 static void sscom_iflush(struct sscom_softc *); 180 static void sscom_hwiflow(struct sscom_softc *); 181 static void sscom_loadchannelregs(struct sscom_softc *); 182 static void tiocm_to_sscom(struct sscom_softc *, u_long, int); 183 static int sscom_to_tiocm(struct sscom_softc *); 184 static void tiocm_to_sscom(struct sscom_softc *, u_long, int); 185 static int sscom_to_tiocm(struct sscom_softc *); 186 static void sscom_iflush(struct sscom_softc *); 187 188 static int sscomhwiflow(struct tty *tp, int block); 189 static int sscom_init(bus_space_tag_t, const struct sscom_uart_info *, 190 int, int, tcflag_t, bus_space_handle_t *); 191 192 extern struct cfdriver sscom_cd; 193 194 const struct cdevsw sscom_cdevsw = { 195 sscomopen, sscomclose, sscomread, sscomwrite, sscomioctl, 196 sscomstop, sscomtty, sscompoll, nommap, ttykqfilter, D_TTY 197 }; 198 199 /* 200 * Make this an option variable one can patch. 201 * But be warned: this must be a power of 2! 202 */ 203 u_int sscom_rbuf_size = SSCOM_RING_SIZE; 204 205 /* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */ 206 u_int sscom_rbuf_hiwat = (SSCOM_RING_SIZE * 1) / 4; 207 u_int sscom_rbuf_lowat = (SSCOM_RING_SIZE * 3) / 4; 208 209 static int sscomconsunit = -1; 210 static bus_space_tag_t sscomconstag; 211 static bus_space_handle_t sscomconsioh; 212 static int sscomconsattached; 213 static int sscomconsrate; 214 static tcflag_t sscomconscflag; 215 static struct cnm_state sscom_cnm_state; 216 217 #ifdef KGDB 218 #include <sys/kgdb.h> 219 220 static int sscom_kgdb_unit = -1; 221 static bus_space_tag_t sscom_kgdb_iot; 222 static bus_space_handle_t sscom_kgdb_ioh; 223 static int sscom_kgdb_attached; 224 225 int sscom_kgdb_getc (void *); 226 void sscom_kgdb_putc (void *, int); 227 #endif /* KGDB */ 228 229 #define SSCOMUNIT_MASK 0x7f 230 #define SSCOMDIALOUT_MASK 0x80 231 232 #define SSCOMUNIT(x) (minor(x) & SSCOMUNIT_MASK) 233 #define SSCOMDIALOUT(x) (minor(x) & SSCOMDIALOUT_MASK) 234 235 #if 0 236 #define SSCOM_ISALIVE(sc) ((sc)->enabled != 0 && \ 237 device_is_active(&(sc)->sc_dev)) 238 #else 239 #define SSCOM_ISALIVE(sc) device_is_active(&(sc)->sc_dev) 240 #endif 241 242 #define BR BUS_SPACE_BARRIER_READ 243 #define BW BUS_SPACE_BARRIER_WRITE 244 #define SSCOM_BARRIER(t, h, f) /* no-op */ 245 246 #if (defined(MULTIPROCESSOR) || defined(LOCKDEBUG)) && defined(SSCOM_MPLOCK) 247 248 #define SSCOM_LOCK(sc) simple_lock(&(sc)->sc_lock) 249 #define SSCOM_UNLOCK(sc) simple_unlock(&(sc)->sc_lock) 250 251 #else 252 253 #define SSCOM_LOCK(sc) 254 #define SSCOM_UNLOCK(sc) 255 256 #endif 257 258 #ifndef SSCOM_TOLERANCE 259 #define SSCOM_TOLERANCE 30 /* XXX: baud rate tolerance, in 0.1% units */ 260 #endif 261 262 /* value for UCON */ 263 #define UCON_RXINT_MASK \ 264 (UCON_RXMODE_MASK|UCON_ERRINT|UCON_TOINT|UCON_RXINT_TYPE) 265 #define UCON_RXINT_ENABLE \ 266 (UCON_RXMODE_INT|UCON_ERRINT|UCON_TOINT|UCON_RXINT_TYPE_LEVEL) 267 #define UCON_TXINT_MASK (UCON_TXMODE_MASK|UCON_TXINT_TYPE) 268 #define UCON_TXINT_ENABLE (UCON_TXMODE_INT|UCON_TXINT_TYPE_LEVEL) 269 270 /* we don't want tx interrupt on debug port, but it is needed to 271 have transmitter active */ 272 #define UCON_DEBUGPORT (UCON_RXINT_ENABLE|UCON_TXINT_ENABLE) 273 274 275 static inline void 276 __sscom_output_chunk(struct sscom_softc *sc, int ufstat) 277 { 278 int n, space; 279 bus_space_tag_t iot = sc->sc_iot; 280 bus_space_handle_t ioh = sc->sc_ioh; 281 282 n = sc->sc_tbc; 283 space = 16 - ((ufstat & UFSTAT_TXCOUNT) >> UFSTAT_TXCOUNT_SHIFT); 284 285 if (n > space) 286 n = space; 287 288 if (n > 0) { 289 bus_space_write_multi_1(iot, ioh, SSCOM_UTXH, sc->sc_tba, n); 290 sc->sc_tbc -= n; 291 sc->sc_tba += n; 292 } 293 } 294 295 static void 296 sscom_output_chunk(struct sscom_softc *sc) 297 { 298 int ufstat = bus_space_read_2(sc->sc_iot, sc->sc_ioh, SSCOM_UFSTAT); 299 300 if (!(ufstat & UFSTAT_TXFULL)) 301 __sscom_output_chunk(sc, ufstat); 302 } 303 304 int 305 sscomspeed(long speed, long frequency) 306 { 307 #define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */ 308 309 int x, err; 310 311 if (speed <= 0) 312 return -1; 313 x = divrnd(frequency / 16, speed); 314 if (x <= 0) 315 return -1; 316 err = divrnd(((quad_t)frequency) * 1000 / 16, speed * x) - 1000; 317 if (err < 0) 318 err = -err; 319 if (err > SSCOM_TOLERANCE) 320 return -1; 321 return x-1; 322 323 #undef divrnd 324 } 325 326 void sscomstatus (struct sscom_softc *, const char *); 327 328 #ifdef SSCOM_DEBUG 329 int sscom_debug = 0; 330 331 void 332 sscomstatus(struct sscom_softc *sc, const char *str) 333 { 334 struct tty *tp = sc->sc_tty; 335 int umstat = bus_space_read_1(sc->sc_iot, sc->sc_iot, SSCOM_UMSTAT); 336 int umcon = bus_space_read_1(sc->sc_iot, sc->sc_iot, SSCOM_UMCON); 337 338 printf("%s: %s %sclocal %sdcd %sts_carr_on %sdtr %stx_stopped\n", 339 sc->sc_dev.dv_xname, str, 340 ISSET(tp->t_cflag, CLOCAL) ? "+" : "-", 341 "+", /* DCD */ 342 ISSET(tp->t_state, TS_CARR_ON) ? "+" : "-", 343 "+", /* DTR */ 344 sc->sc_tx_stopped ? "+" : "-"); 345 346 printf("%s: %s %scrtscts %scts %sts_ttstop %srts %xrx_flags\n", 347 sc->sc_dev.dv_xname, str, 348 ISSET(tp->t_cflag, CRTSCTS) ? "+" : "-", 349 ISSET(umstat, UMSTAT_CTS) ? "+" : "-", 350 ISSET(tp->t_state, TS_TTSTOP) ? "+" : "-", 351 ISSET(umcon, UMCON_RTS) ? "+" : "-", 352 sc->sc_rx_flags); 353 } 354 #else 355 #define sscom_debug 0 356 #endif 357 358 static void 359 sscom_enable_debugport(struct sscom_softc *sc) 360 { 361 int s; 362 363 /* Turn on line break interrupt, set carrier. */ 364 s = splserial(); 365 SSCOM_LOCK(sc); 366 sc->sc_ucon = UCON_DEBUGPORT; 367 bus_space_write_2(sc->sc_iot, sc->sc_ioh, SSCOM_UCON, sc->sc_ucon); 368 sc->sc_umcon = UMCON_RTS|UMCON_DTR; 369 sc->set_modem_control(sc); 370 sscom_enable_rxint(sc); 371 sscom_disable_txint(sc); 372 SSCOM_UNLOCK(sc); 373 splx(s); 374 } 375 376 static void 377 sscom_set_modem_control(struct sscom_softc *sc) 378 { 379 /* flob RTS */ 380 bus_space_write_1(sc->sc_iot, sc->sc_ioh, 381 SSCOM_UMCON, sc->sc_umcon & UMCON_HW_MASK); 382 /* ignore DTR */ 383 } 384 385 static int 386 sscom_read_modem_status(struct sscom_softc *sc) 387 { 388 int msts; 389 390 msts = bus_space_read_1(sc->sc_iot, sc->sc_ioh, SSCOM_UMSTAT); 391 392 /* DCD and DSR are always on */ 393 return (msts & UMSTAT_CTS) | MSTS_DCD | MSTS_DSR; 394 } 395 396 void 397 sscom_attach_subr(struct sscom_softc *sc) 398 { 399 int unit = sc->sc_unit; 400 bus_space_tag_t iot = sc->sc_iot; 401 bus_space_handle_t ioh = sc->sc_ioh; 402 struct tty *tp; 403 404 callout_init(&sc->sc_diag_callout, 0); 405 #if (defined(MULTIPROCESSOR) || defined(LOCKDEBUG)) && defined(SSCOM_MPLOCK) 406 simple_lock_init(&sc->sc_lock); 407 #endif 408 409 sc->sc_ucon = UCON_RXINT_ENABLE|UCON_TXINT_ENABLE; 410 411 /* 412 * set default for modem control hook 413 */ 414 if (sc->set_modem_control == NULL) 415 sc->set_modem_control = sscom_set_modem_control; 416 if (sc->read_modem_status == NULL) 417 sc->read_modem_status = sscom_read_modem_status; 418 419 /* Disable interrupts before configuring the device. */ 420 sscom_disable_txrxint(sc); 421 422 #ifdef KGDB 423 /* 424 * Allow kgdb to "take over" this port. If this is 425 * the kgdb device, it has exclusive use. 426 */ 427 if (unit == sscom_kgdb_unit) { 428 SET(sc->sc_hwflags, SSCOM_HW_KGDB); 429 sc->sc_ucon = UCON_DEBUGPORT; 430 } 431 #endif 432 433 if (unit == sscomconsunit) { 434 sscomconsattached = 1; 435 436 sscomconstag = iot; 437 sscomconsioh = ioh; 438 439 /* Make sure the console is always "hardwired". */ 440 delay(1000); /* XXX: wait for output to finish */ 441 SET(sc->sc_hwflags, SSCOM_HW_CONSOLE); 442 SET(sc->sc_swflags, TIOCFLAG_SOFTCAR); 443 444 sc->sc_ucon = UCON_DEBUGPORT; 445 } 446 447 bus_space_write_1(iot, ioh, SSCOM_UFCON, 448 UFCON_TXTRIGGER_8|UFCON_RXTRIGGER_8|UFCON_FIFO_ENABLE| 449 UFCON_TXFIFO_RESET|UFCON_RXFIFO_RESET); 450 451 bus_space_write_1(iot, ioh, SSCOM_UCON, sc->sc_ucon); 452 453 #ifdef KGDB 454 if (ISSET(sc->sc_hwflags, SSCOM_HW_KGDB)) { 455 sscom_kgdb_attached = 1; 456 printf("%s: kgdb\n", sc->sc_dev.dv_xname); 457 sscom_enable_debugport(sc); 458 return; 459 } 460 #endif 461 462 463 464 tp = ttymalloc(); 465 tp->t_oproc = sscomstart; 466 tp->t_param = sscomparam; 467 tp->t_hwiflow = sscomhwiflow; 468 469 sc->sc_tty = tp; 470 sc->sc_rbuf = malloc(sscom_rbuf_size << 1, M_DEVBUF, M_NOWAIT); 471 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 472 sc->sc_rbavail = sscom_rbuf_size; 473 if (sc->sc_rbuf == NULL) { 474 printf("%s: unable to allocate ring buffer\n", 475 sc->sc_dev.dv_xname); 476 return; 477 } 478 sc->sc_ebuf = sc->sc_rbuf + (sscom_rbuf_size << 1); 479 480 tty_attach(tp); 481 482 if (ISSET(sc->sc_hwflags, SSCOM_HW_CONSOLE)) { 483 int maj; 484 485 /* locate the major number */ 486 maj = cdevsw_lookup_major(&sscom_cdevsw); 487 488 cn_tab->cn_dev = makedev(maj, device_unit(&sc->sc_dev)); 489 490 printf("%s: console (major=%d)\n", sc->sc_dev.dv_xname, maj); 491 } 492 493 494 sc->sc_si = softint_establish(SOFTINT_SERIAL, sscomsoft, sc); 495 496 #if NRND > 0 && defined(RND_COM) 497 rnd_attach_source(&sc->rnd_source, sc->sc_dev.dv_xname, 498 RND_TYPE_TTY, 0); 499 #endif 500 501 /* if there are no enable/disable functions, assume the device 502 is always enabled */ 503 504 if (ISSET(sc->sc_hwflags, SSCOM_HW_CONSOLE)) 505 sscom_enable_debugport(sc); 506 else 507 sscom_disable_txrxint(sc); 508 509 SET(sc->sc_hwflags, SSCOM_HW_DEV_OK); 510 } 511 512 int 513 sscom_detach(struct device *self, int flags) 514 { 515 return 0; 516 } 517 518 int 519 sscom_activate(struct device *self, enum devact act) 520 { 521 #ifdef notyet 522 struct sscom_softc *sc = (struct sscom_softc *)self; 523 int s, rv = 0; 524 525 s = splserial(); 526 SSCOM_LOCK(sc); 527 switch (act) { 528 case DVACT_ACTIVATE: 529 rv = EOPNOTSUPP; 530 break; 531 532 case DVACT_DEACTIVATE: 533 if (sc->sc_hwflags & (SSCOM_HW_CONSOLE|SSCOM_HW_KGDB)) { 534 rv = EBUSY; 535 break; 536 } 537 538 sc->enabled = 0; 539 break; 540 } 541 542 SSCOM_UNLOCK(sc); 543 splx(s); 544 return rv; 545 #else 546 return 0; 547 #endif 548 } 549 550 void 551 sscom_shutdown(struct sscom_softc *sc) 552 { 553 #ifdef notyet 554 struct tty *tp = sc->sc_tty; 555 int s; 556 557 s = splserial(); 558 SSCOM_LOCK(sc); 559 560 /* If we were asserting flow control, then deassert it. */ 561 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 562 sscom_hwiflow(sc); 563 564 /* Clear any break condition set with TIOCSBRK. */ 565 sscom_break(sc, 0); 566 567 /* 568 * Hang up if necessary. Wait a bit, so the other side has time to 569 * notice even if we immediately open the port again. 570 * Avoid tsleeping above splhigh(). 571 */ 572 if (ISSET(tp->t_cflag, HUPCL)) { 573 sscom_modem(sc, 0); 574 SSCOM_UNLOCK(sc); 575 splx(s); 576 /* XXX tsleep will only timeout */ 577 (void) tsleep(sc, TTIPRI, ttclos, hz); 578 s = splserial(); 579 SSCOM_LOCK(sc); 580 } 581 582 if (ISSET(sc->sc_hwflags, SSCOM_HW_CONSOLE)) 583 /* interrupt on break */ 584 sc->sc_ucon = UCON_DEBUGPORT; 585 else 586 sc->sc_ucon = 0; 587 bus_space_write_2(sc->sc_iot, sc->sc_ioh, SSCOM_UCON, sc->sc_ucon); 588 589 #ifdef DIAGNOSTIC 590 if (!sc->enabled) 591 panic("sscom_shutdown: not enabled?"); 592 #endif 593 sc->enabled = 0; 594 SSCOM_UNLOCK(sc); 595 splx(s); 596 #endif 597 } 598 599 int 600 sscomopen(dev_t dev, int flag, int mode, struct lwp *l) 601 { 602 struct sscom_softc *sc; 603 struct tty *tp; 604 int s, s2; 605 int error; 606 607 sc = device_lookup_private(&sscom_cd, SSCOMUNIT(dev)); 608 if (sc == NULL || !ISSET(sc->sc_hwflags, SSCOM_HW_DEV_OK) || 609 sc->sc_rbuf == NULL) 610 return ENXIO; 611 612 if (!device_is_active(&sc->sc_dev)) 613 return ENXIO; 614 615 #ifdef KGDB 616 /* 617 * If this is the kgdb port, no other use is permitted. 618 */ 619 if (ISSET(sc->sc_hwflags, SSCOM_HW_KGDB)) 620 return EBUSY; 621 #endif 622 623 tp = sc->sc_tty; 624 625 if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp)) 626 return (EBUSY); 627 628 s = spltty(); 629 630 /* 631 * Do the following iff this is a first open. 632 */ 633 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 634 struct termios t; 635 636 tp->t_dev = dev; 637 638 s2 = splserial(); 639 SSCOM_LOCK(sc); 640 641 /* Turn on interrupts. */ 642 sscom_enable_txrxint(sc); 643 644 /* Fetch the current modem control status, needed later. */ 645 sc->sc_msts = sc->read_modem_status(sc); 646 647 #if 0 648 /* Clear PPS capture state on first open. */ 649 sc->sc_ppsmask = 0; 650 sc->ppsparam.mode = 0; 651 #endif 652 653 SSCOM_UNLOCK(sc); 654 splx(s2); 655 656 /* 657 * Initialize the termios status to the defaults. Add in the 658 * sticky bits from TIOCSFLAGS. 659 */ 660 t.c_ispeed = 0; 661 if (ISSET(sc->sc_hwflags, SSCOM_HW_CONSOLE)) { 662 t.c_ospeed = sscomconsrate; 663 t.c_cflag = sscomconscflag; 664 } else { 665 t.c_ospeed = TTYDEF_SPEED; 666 t.c_cflag = TTYDEF_CFLAG; 667 } 668 if (ISSET(sc->sc_swflags, TIOCFLAG_CLOCAL)) 669 SET(t.c_cflag, CLOCAL); 670 if (ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS)) 671 SET(t.c_cflag, CRTSCTS); 672 if (ISSET(sc->sc_swflags, TIOCFLAG_MDMBUF)) 673 SET(t.c_cflag, MDMBUF); 674 /* Make sure sscomparam() will do something. */ 675 tp->t_ospeed = 0; 676 (void) sscomparam(tp, &t); 677 tp->t_iflag = TTYDEF_IFLAG; 678 tp->t_oflag = TTYDEF_OFLAG; 679 tp->t_lflag = TTYDEF_LFLAG; 680 ttychars(tp); 681 ttsetwater(tp); 682 683 s2 = splserial(); 684 SSCOM_LOCK(sc); 685 686 /* 687 * Turn on DTR. We must always do this, even if carrier is not 688 * present, because otherwise we'd have to use TIOCSDTR 689 * immediately after setting CLOCAL, which applications do not 690 * expect. We always assert DTR while the device is open 691 * unless explicitly requested to deassert it. 692 */ 693 sscom_modem(sc, 1); 694 695 /* Clear the input ring, and unblock. */ 696 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 697 sc->sc_rbavail = sscom_rbuf_size; 698 sscom_iflush(sc); 699 CLR(sc->sc_rx_flags, RX_ANY_BLOCK); 700 sscom_hwiflow(sc); 701 702 if (sscom_debug) 703 sscomstatus(sc, "sscomopen "); 704 705 SSCOM_UNLOCK(sc); 706 splx(s2); 707 } 708 709 splx(s); 710 711 error = ttyopen(tp, SSCOMDIALOUT(dev), ISSET(flag, O_NONBLOCK)); 712 if (error) 713 goto bad; 714 715 error = (*tp->t_linesw->l_open)(dev, tp); 716 if (error) 717 goto bad; 718 719 return 0; 720 721 bad: 722 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 723 /* 724 * We failed to open the device, and nobody else had it opened. 725 * Clean up the state as appropriate. 726 */ 727 sscom_shutdown(sc); 728 } 729 730 return error; 731 } 732 733 int 734 sscomclose(dev_t dev, int flag, int mode, struct lwp *l) 735 { 736 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(dev)); 737 struct tty *tp = sc->sc_tty; 738 739 /* XXX This is for cons.c. */ 740 if (!ISSET(tp->t_state, TS_ISOPEN)) 741 return 0; 742 743 (*tp->t_linesw->l_close)(tp, flag); 744 ttyclose(tp); 745 746 if (SSCOM_ISALIVE(sc) == 0) 747 return 0; 748 749 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 750 /* 751 * Although we got a last close, the device may still be in 752 * use; e.g. if this was the dialout node, and there are still 753 * processes waiting for carrier on the non-dialout node. 754 */ 755 sscom_shutdown(sc); 756 } 757 758 return 0; 759 } 760 761 int 762 sscomread(dev_t dev, struct uio *uio, int flag) 763 { 764 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(dev)); 765 struct tty *tp = sc->sc_tty; 766 767 if (SSCOM_ISALIVE(sc) == 0) 768 return EIO; 769 770 return (*tp->t_linesw->l_read)(tp, uio, flag); 771 } 772 773 int 774 sscomwrite(dev_t dev, struct uio *uio, int flag) 775 { 776 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(dev)); 777 struct tty *tp = sc->sc_tty; 778 779 if (SSCOM_ISALIVE(sc) == 0) 780 return EIO; 781 782 return (*tp->t_linesw->l_write)(tp, uio, flag); 783 } 784 785 int 786 sscompoll(dev_t dev, int events, struct lwp *l) 787 { 788 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(dev)); 789 struct tty *tp = sc->sc_tty; 790 791 if (SSCOM_ISALIVE(sc) == 0) 792 return EIO; 793 794 return (*tp->t_linesw->l_poll)(tp, events, l); 795 } 796 797 struct tty * 798 sscomtty(dev_t dev) 799 { 800 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(dev)); 801 struct tty *tp = sc->sc_tty; 802 803 return tp; 804 } 805 806 int 807 sscomioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 808 { 809 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(dev)); 810 struct tty *tp = sc->sc_tty; 811 int error; 812 int s; 813 814 if (SSCOM_ISALIVE(sc) == 0) 815 return EIO; 816 817 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 818 if (error != EPASSTHROUGH) 819 return error; 820 821 error = ttioctl(tp, cmd, data, flag, l); 822 if (error != EPASSTHROUGH) 823 return error; 824 825 error = 0; 826 827 s = splserial(); 828 SSCOM_LOCK(sc); 829 830 switch (cmd) { 831 case TIOCSBRK: 832 sscom_break(sc, 1); 833 break; 834 835 case TIOCCBRK: 836 sscom_break(sc, 0); 837 break; 838 839 case TIOCSDTR: 840 sscom_modem(sc, 1); 841 break; 842 843 case TIOCCDTR: 844 sscom_modem(sc, 0); 845 break; 846 847 case TIOCGFLAGS: 848 *(int *)data = sc->sc_swflags; 849 break; 850 851 case TIOCSFLAGS: 852 error = kauth_authorize_device_tty(l->l_cred, 853 KAUTH_DEVICE_TTY_PRIVSET, tp); 854 if (error) 855 break; 856 sc->sc_swflags = *(int *)data; 857 break; 858 859 case TIOCMSET: 860 case TIOCMBIS: 861 case TIOCMBIC: 862 tiocm_to_sscom(sc, cmd, *(int *)data); 863 break; 864 865 case TIOCMGET: 866 *(int *)data = sscom_to_tiocm(sc); 867 break; 868 869 default: 870 error = EPASSTHROUGH; 871 break; 872 } 873 874 SSCOM_UNLOCK(sc); 875 splx(s); 876 877 if (sscom_debug) 878 sscomstatus(sc, "sscomioctl "); 879 880 return error; 881 } 882 883 integrate void 884 sscom_schedrx(struct sscom_softc *sc) 885 { 886 887 sc->sc_rx_ready = 1; 888 889 /* Wake up the poller. */ 890 softint_schedule(sc->sc_si); 891 } 892 893 static void 894 sscom_break(struct sscom_softc *sc, int onoff) 895 { 896 897 if (onoff) 898 SET(sc->sc_ucon, UCON_SBREAK); 899 else 900 CLR(sc->sc_ucon, UCON_SBREAK); 901 902 if (!sc->sc_heldchange) { 903 if (sc->sc_tx_busy) { 904 sc->sc_heldtbc = sc->sc_tbc; 905 sc->sc_tbc = 0; 906 sc->sc_heldchange = 1; 907 } else 908 sscom_loadchannelregs(sc); 909 } 910 } 911 912 static void 913 sscom_modem(struct sscom_softc *sc, int onoff) 914 { 915 if (onoff) 916 SET(sc->sc_umcon, UMCON_DTR); 917 else 918 CLR(sc->sc_umcon, UMCON_DTR); 919 920 if (!sc->sc_heldchange) { 921 if (sc->sc_tx_busy) { 922 sc->sc_heldtbc = sc->sc_tbc; 923 sc->sc_tbc = 0; 924 sc->sc_heldchange = 1; 925 } else 926 sscom_loadchannelregs(sc); 927 } 928 } 929 930 static void 931 tiocm_to_sscom(struct sscom_softc *sc, u_long how, int ttybits) 932 { 933 u_char sscombits; 934 935 sscombits = 0; 936 if (ISSET(ttybits, TIOCM_DTR)) 937 sscombits = UMCON_DTR; 938 if (ISSET(ttybits, TIOCM_RTS)) 939 SET(sscombits, UMCON_RTS); 940 941 switch (how) { 942 case TIOCMBIC: 943 CLR(sc->sc_umcon, sscombits); 944 break; 945 946 case TIOCMBIS: 947 SET(sc->sc_umcon, sscombits); 948 break; 949 950 case TIOCMSET: 951 CLR(sc->sc_umcon, UMCON_DTR); 952 SET(sc->sc_umcon, sscombits); 953 break; 954 } 955 956 if (!sc->sc_heldchange) { 957 if (sc->sc_tx_busy) { 958 sc->sc_heldtbc = sc->sc_tbc; 959 sc->sc_tbc = 0; 960 sc->sc_heldchange = 1; 961 } else 962 sscom_loadchannelregs(sc); 963 } 964 } 965 966 static int 967 sscom_to_tiocm(struct sscom_softc *sc) 968 { 969 u_char sscombits; 970 int ttybits = 0; 971 972 sscombits = sc->sc_umcon; 973 #if 0 974 if (ISSET(sscombits, MCR_DTR)) 975 SET(ttybits, TIOCM_DTR); 976 #endif 977 if (ISSET(sscombits, UMCON_RTS)) 978 SET(ttybits, TIOCM_RTS); 979 980 sscombits = sc->sc_msts; 981 if (ISSET(sscombits, MSTS_DCD)) 982 SET(ttybits, TIOCM_CD); 983 if (ISSET(sscombits, MSTS_DSR)) 984 SET(ttybits, TIOCM_DSR); 985 if (ISSET(sscombits, MSTS_CTS)) 986 SET(ttybits, TIOCM_CTS); 987 988 if (sc->sc_ucon != 0) 989 SET(ttybits, TIOCM_LE); 990 991 return ttybits; 992 } 993 994 static int 995 cflag2lcr(tcflag_t cflag) 996 { 997 u_char lcr = ULCON_PARITY_NONE; 998 999 switch (cflag & (PARENB|PARODD)) { 1000 case PARENB|PARODD: lcr = ULCON_PARITY_ODD; break; 1001 case PARENB: lcr = ULCON_PARITY_EVEN; 1002 } 1003 1004 switch (ISSET(cflag, CSIZE)) { 1005 case CS5: 1006 SET(lcr, ULCON_LENGTH_5); 1007 break; 1008 case CS6: 1009 SET(lcr, ULCON_LENGTH_6); 1010 break; 1011 case CS7: 1012 SET(lcr, ULCON_LENGTH_7); 1013 break; 1014 case CS8: 1015 SET(lcr, ULCON_LENGTH_8); 1016 break; 1017 } 1018 if (ISSET(cflag, CSTOPB)) 1019 SET(lcr, ULCON_STOP); 1020 1021 return lcr; 1022 } 1023 1024 int 1025 sscomparam(struct tty *tp, struct termios *t) 1026 { 1027 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(tp->t_dev)); 1028 int ospeed; 1029 u_char lcr; 1030 int s; 1031 1032 if (SSCOM_ISALIVE(sc) == 0) 1033 return EIO; 1034 1035 ospeed = sscomspeed(t->c_ospeed, sc->sc_frequency); 1036 1037 /* Check requested parameters. */ 1038 if (ospeed < 0) 1039 return EINVAL; 1040 if (t->c_ispeed && t->c_ispeed != t->c_ospeed) 1041 return EINVAL; 1042 1043 /* 1044 * For the console, always force CLOCAL and !HUPCL, so that the port 1045 * is always active. 1046 */ 1047 if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) || 1048 ISSET(sc->sc_hwflags, SSCOM_HW_CONSOLE)) { 1049 SET(t->c_cflag, CLOCAL); 1050 CLR(t->c_cflag, HUPCL); 1051 } 1052 1053 /* 1054 * If there were no changes, don't do anything. This avoids dropping 1055 * input and improves performance when all we did was frob things like 1056 * VMIN and VTIME. 1057 */ 1058 if (tp->t_ospeed == t->c_ospeed && 1059 tp->t_cflag == t->c_cflag) 1060 return 0; 1061 1062 lcr = cflag2lcr(t->c_cflag); 1063 1064 s = splserial(); 1065 SSCOM_LOCK(sc); 1066 1067 sc->sc_ulcon = lcr; 1068 1069 /* 1070 * If we're not in a mode that assumes a connection is present, then 1071 * ignore carrier changes. 1072 */ 1073 if (ISSET(t->c_cflag, CLOCAL | MDMBUF)) 1074 sc->sc_msr_dcd = 0; 1075 else 1076 sc->sc_msr_dcd = MSTS_DCD; 1077 1078 /* 1079 * Set the flow control pins depending on the current flow control 1080 * mode. 1081 */ 1082 if (ISSET(t->c_cflag, CRTSCTS)) { 1083 sc->sc_mcr_dtr = UMCON_DTR; 1084 sc->sc_mcr_rts = UMCON_RTS; 1085 sc->sc_msr_cts = MSTS_CTS; 1086 } 1087 else if (ISSET(t->c_cflag, MDMBUF)) { 1088 /* 1089 * For DTR/DCD flow control, make sure we don't toggle DTR for 1090 * carrier detection. 1091 */ 1092 sc->sc_mcr_dtr = 0; 1093 sc->sc_mcr_rts = UMCON_DTR; 1094 sc->sc_msr_cts = MSTS_DCD; 1095 } 1096 else { 1097 /* 1098 * If no flow control, then always set RTS. This will make 1099 * the other side happy if it mistakenly thinks we're doing 1100 * RTS/CTS flow control. 1101 */ 1102 sc->sc_mcr_dtr = UMCON_DTR | UMCON_RTS; 1103 sc->sc_mcr_rts = 0; 1104 sc->sc_msr_cts = 0; 1105 if (ISSET(sc->sc_umcon, UMCON_DTR)) 1106 SET(sc->sc_umcon, UMCON_RTS); 1107 else 1108 CLR(sc->sc_umcon, UMCON_RTS); 1109 } 1110 sc->sc_msr_mask = sc->sc_msr_cts | sc->sc_msr_dcd; 1111 1112 if (ospeed == 0) 1113 CLR(sc->sc_umcon, sc->sc_mcr_dtr); 1114 else 1115 SET(sc->sc_umcon, sc->sc_mcr_dtr); 1116 1117 sc->sc_ubrdiv = ospeed; 1118 1119 /* And copy to tty. */ 1120 tp->t_ispeed = 0; 1121 tp->t_ospeed = t->c_ospeed; 1122 tp->t_cflag = t->c_cflag; 1123 1124 if (!sc->sc_heldchange) { 1125 if (sc->sc_tx_busy) { 1126 sc->sc_heldtbc = sc->sc_tbc; 1127 sc->sc_tbc = 0; 1128 sc->sc_heldchange = 1; 1129 } else 1130 sscom_loadchannelregs(sc); 1131 } 1132 1133 if (!ISSET(t->c_cflag, CHWFLOW)) { 1134 /* Disable the high water mark. */ 1135 sc->sc_r_hiwat = 0; 1136 sc->sc_r_lowat = 0; 1137 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1138 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1139 sscom_schedrx(sc); 1140 } 1141 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 1142 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 1143 sscom_hwiflow(sc); 1144 } 1145 } else { 1146 sc->sc_r_hiwat = sscom_rbuf_hiwat; 1147 sc->sc_r_lowat = sscom_rbuf_lowat; 1148 } 1149 1150 SSCOM_UNLOCK(sc); 1151 splx(s); 1152 1153 /* 1154 * Update the tty layer's idea of the carrier bit, in case we changed 1155 * CLOCAL or MDMBUF. We don't hang up here; we only do that by 1156 * explicit request. 1157 */ 1158 (void) (*tp->t_linesw->l_modem)(tp, ISSET(sc->sc_msts, MSTS_DCD)); 1159 1160 if (sscom_debug) 1161 sscomstatus(sc, "sscomparam "); 1162 1163 if (!ISSET(t->c_cflag, CHWFLOW)) { 1164 if (sc->sc_tx_stopped) { 1165 sc->sc_tx_stopped = 0; 1166 sscomstart(tp); 1167 } 1168 } 1169 1170 return 0; 1171 } 1172 1173 static void 1174 sscom_iflush(struct sscom_softc *sc) 1175 { 1176 bus_space_tag_t iot = sc->sc_iot; 1177 bus_space_handle_t ioh = sc->sc_ioh; 1178 int timo; 1179 1180 1181 timo = 50000; 1182 /* flush any pending I/O */ 1183 while ( sscom_rxrdy(iot, ioh) && --timo) 1184 (void)sscom_getc(iot,ioh); 1185 #ifdef DIAGNOSTIC 1186 if (!timo) 1187 printf("%s: sscom_iflush timeout\n", sc->sc_dev.dv_xname); 1188 #endif 1189 } 1190 1191 static void 1192 sscom_loadchannelregs(struct sscom_softc *sc) 1193 { 1194 bus_space_tag_t iot = sc->sc_iot; 1195 bus_space_handle_t ioh = sc->sc_ioh; 1196 1197 /* XXXXX necessary? */ 1198 sscom_iflush(sc); 1199 1200 bus_space_write_2(iot, ioh, SSCOM_UCON, 0); 1201 1202 #if 0 1203 if (ISSET(sc->sc_hwflags, COM_HW_FLOW)) { 1204 bus_space_write_1(iot, ioh, com_lcr, LCR_EERS); 1205 bus_space_write_1(iot, ioh, com_efr, sc->sc_efr); 1206 } 1207 #endif 1208 1209 bus_space_write_2(iot, ioh, SSCOM_UBRDIV, sc->sc_ubrdiv); 1210 bus_space_write_1(iot, ioh, SSCOM_ULCON, sc->sc_ulcon); 1211 sc->set_modem_control(sc); 1212 bus_space_write_2(iot, ioh, SSCOM_UCON, sc->sc_ucon); 1213 } 1214 1215 static int 1216 sscomhwiflow(struct tty *tp, int block) 1217 { 1218 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(tp->t_dev)); 1219 int s; 1220 1221 if (SSCOM_ISALIVE(sc) == 0) 1222 return 0; 1223 1224 if (sc->sc_mcr_rts == 0) 1225 return 0; 1226 1227 s = splserial(); 1228 SSCOM_LOCK(sc); 1229 1230 if (block) { 1231 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1232 SET(sc->sc_rx_flags, RX_TTY_BLOCKED); 1233 sscom_hwiflow(sc); 1234 } 1235 } else { 1236 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1237 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1238 sscom_schedrx(sc); 1239 } 1240 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1241 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED); 1242 sscom_hwiflow(sc); 1243 } 1244 } 1245 1246 SSCOM_UNLOCK(sc); 1247 splx(s); 1248 return 1; 1249 } 1250 1251 /* 1252 * (un)block input via hw flowcontrol 1253 */ 1254 static void 1255 sscom_hwiflow(struct sscom_softc *sc) 1256 { 1257 if (sc->sc_mcr_rts == 0) 1258 return; 1259 1260 if (ISSET(sc->sc_rx_flags, RX_ANY_BLOCK)) { 1261 CLR(sc->sc_umcon, sc->sc_mcr_rts); 1262 CLR(sc->sc_mcr_active, sc->sc_mcr_rts); 1263 } else { 1264 SET(sc->sc_umcon, sc->sc_mcr_rts); 1265 SET(sc->sc_mcr_active, sc->sc_mcr_rts); 1266 } 1267 sc->set_modem_control(sc); 1268 } 1269 1270 1271 void 1272 sscomstart(struct tty *tp) 1273 { 1274 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(tp->t_dev)); 1275 int s; 1276 1277 if (SSCOM_ISALIVE(sc) == 0) 1278 return; 1279 1280 s = spltty(); 1281 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 1282 goto out; 1283 if (sc->sc_tx_stopped) 1284 goto out; 1285 if (!ttypull(tp)) 1286 goto out; 1287 1288 /* Grab the first contiguous region of buffer space. */ 1289 { 1290 u_char *tba; 1291 int tbc; 1292 1293 tba = tp->t_outq.c_cf; 1294 tbc = ndqb(&tp->t_outq, 0); 1295 1296 (void)splserial(); 1297 SSCOM_LOCK(sc); 1298 1299 sc->sc_tba = tba; 1300 sc->sc_tbc = tbc; 1301 } 1302 1303 SET(tp->t_state, TS_BUSY); 1304 sc->sc_tx_busy = 1; 1305 1306 /* Output the first chunk of the contiguous buffer. */ 1307 sscom_output_chunk(sc); 1308 1309 /* Enable transmit completion interrupts if necessary. */ 1310 if ((sc->sc_hwflags & SSCOM_HW_TXINT) == 0) 1311 sscom_enable_txint(sc); 1312 1313 SSCOM_UNLOCK(sc); 1314 out: 1315 splx(s); 1316 return; 1317 } 1318 1319 /* 1320 * Stop output on a line. 1321 */ 1322 void 1323 sscomstop(struct tty *tp, int flag) 1324 { 1325 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(tp->t_dev)); 1326 int s; 1327 1328 s = splserial(); 1329 SSCOM_LOCK(sc); 1330 if (ISSET(tp->t_state, TS_BUSY)) { 1331 /* Stop transmitting at the next chunk. */ 1332 sc->sc_tbc = 0; 1333 sc->sc_heldtbc = 0; 1334 if (!ISSET(tp->t_state, TS_TTSTOP)) 1335 SET(tp->t_state, TS_FLUSH); 1336 } 1337 SSCOM_UNLOCK(sc); 1338 splx(s); 1339 } 1340 1341 void 1342 sscomdiag(void *arg) 1343 { 1344 struct sscom_softc *sc = arg; 1345 int overflows, floods; 1346 int s; 1347 1348 s = splserial(); 1349 SSCOM_LOCK(sc); 1350 overflows = sc->sc_overflows; 1351 sc->sc_overflows = 0; 1352 floods = sc->sc_floods; 1353 sc->sc_floods = 0; 1354 sc->sc_errors = 0; 1355 SSCOM_UNLOCK(sc); 1356 splx(s); 1357 1358 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1359 sc->sc_dev.dv_xname, 1360 overflows, overflows == 1 ? "" : "s", 1361 floods, floods == 1 ? "" : "s"); 1362 } 1363 1364 integrate void 1365 sscom_rxsoft(struct sscom_softc *sc, struct tty *tp) 1366 { 1367 int (*rint) (int, struct tty *) = tp->t_linesw->l_rint; 1368 u_char *get, *end; 1369 u_int cc, scc; 1370 u_char rsr; 1371 int code; 1372 int s; 1373 1374 end = sc->sc_ebuf; 1375 get = sc->sc_rbget; 1376 scc = cc = sscom_rbuf_size - sc->sc_rbavail; 1377 1378 if (cc == sscom_rbuf_size) { 1379 sc->sc_floods++; 1380 if (sc->sc_errors++ == 0) 1381 callout_reset(&sc->sc_diag_callout, 60 * hz, 1382 sscomdiag, sc); 1383 } 1384 1385 while (cc) { 1386 code = get[0]; 1387 rsr = get[1]; 1388 if (rsr) { 1389 if (ISSET(rsr, UERSTAT_OVERRUN)) { 1390 sc->sc_overflows++; 1391 if (sc->sc_errors++ == 0) 1392 callout_reset(&sc->sc_diag_callout, 1393 60 * hz, sscomdiag, sc); 1394 } 1395 if (ISSET(rsr, UERSTAT_BREAK | UERSTAT_FRAME)) 1396 SET(code, TTY_FE); 1397 if (ISSET(rsr, UERSTAT_PARITY)) 1398 SET(code, TTY_PE); 1399 } 1400 if ((*rint)(code, tp) == -1) { 1401 /* 1402 * The line discipline's buffer is out of space. 1403 */ 1404 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1405 /* 1406 * We're either not using flow control, or the 1407 * line discipline didn't tell us to block for 1408 * some reason. Either way, we have no way to 1409 * know when there's more space available, so 1410 * just drop the rest of the data. 1411 */ 1412 get += cc << 1; 1413 if (get >= end) 1414 get -= sscom_rbuf_size << 1; 1415 cc = 0; 1416 } else { 1417 /* 1418 * Don't schedule any more receive processing 1419 * until the line discipline tells us there's 1420 * space available (through sscomhwiflow()). 1421 * Leave the rest of the data in the input 1422 * buffer. 1423 */ 1424 SET(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1425 } 1426 break; 1427 } 1428 get += 2; 1429 if (get >= end) 1430 get = sc->sc_rbuf; 1431 cc--; 1432 } 1433 1434 if (cc != scc) { 1435 sc->sc_rbget = get; 1436 s = splserial(); 1437 SSCOM_LOCK(sc); 1438 1439 cc = sc->sc_rbavail += scc - cc; 1440 /* Buffers should be ok again, release possible block. */ 1441 if (cc >= sc->sc_r_lowat) { 1442 if (ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1443 CLR(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1444 sscom_enable_rxint(sc); 1445 sc->sc_ucon |= UCON_ERRINT; 1446 bus_space_write_2(sc->sc_iot, sc->sc_ioh, SSCOM_UCON, 1447 sc->sc_ucon); 1448 1449 } 1450 if (ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED)) { 1451 CLR(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1452 sscom_hwiflow(sc); 1453 } 1454 } 1455 SSCOM_UNLOCK(sc); 1456 splx(s); 1457 } 1458 } 1459 1460 integrate void 1461 sscom_txsoft(struct sscom_softc *sc, struct tty *tp) 1462 { 1463 1464 CLR(tp->t_state, TS_BUSY); 1465 if (ISSET(tp->t_state, TS_FLUSH)) 1466 CLR(tp->t_state, TS_FLUSH); 1467 else 1468 ndflush(&tp->t_outq, (int)(sc->sc_tba - tp->t_outq.c_cf)); 1469 (*tp->t_linesw->l_start)(tp); 1470 } 1471 1472 integrate void 1473 sscom_stsoft(struct sscom_softc *sc, struct tty *tp) 1474 { 1475 u_char msr, delta; 1476 int s; 1477 1478 s = splserial(); 1479 SSCOM_LOCK(sc); 1480 msr = sc->sc_msts; 1481 delta = sc->sc_msr_delta; 1482 sc->sc_msr_delta = 0; 1483 SSCOM_UNLOCK(sc); 1484 splx(s); 1485 1486 if (ISSET(delta, sc->sc_msr_dcd)) { 1487 /* 1488 * Inform the tty layer that carrier detect changed. 1489 */ 1490 (void) (*tp->t_linesw->l_modem)(tp, ISSET(msr, MSTS_DCD)); 1491 } 1492 1493 if (ISSET(delta, sc->sc_msr_cts)) { 1494 /* Block or unblock output according to flow control. */ 1495 if (ISSET(msr, sc->sc_msr_cts)) { 1496 sc->sc_tx_stopped = 0; 1497 (*tp->t_linesw->l_start)(tp); 1498 } else { 1499 sc->sc_tx_stopped = 1; 1500 } 1501 } 1502 1503 if (sscom_debug) 1504 sscomstatus(sc, "sscom_stsoft"); 1505 } 1506 1507 void 1508 sscomsoft(void *arg) 1509 { 1510 struct sscom_softc *sc = arg; 1511 struct tty *tp; 1512 1513 if (SSCOM_ISALIVE(sc) == 0) 1514 return; 1515 1516 { 1517 tp = sc->sc_tty; 1518 1519 if (sc->sc_rx_ready) { 1520 sc->sc_rx_ready = 0; 1521 sscom_rxsoft(sc, tp); 1522 } 1523 1524 if (sc->sc_st_check) { 1525 sc->sc_st_check = 0; 1526 sscom_stsoft(sc, tp); 1527 } 1528 1529 if (sc->sc_tx_done) { 1530 sc->sc_tx_done = 0; 1531 sscom_txsoft(sc, tp); 1532 } 1533 } 1534 } 1535 1536 1537 int 1538 sscomrxintr(void *arg) 1539 { 1540 struct sscom_softc *sc = arg; 1541 bus_space_tag_t iot = sc->sc_iot; 1542 bus_space_handle_t ioh = sc->sc_ioh; 1543 u_char *put, *end; 1544 u_int cc; 1545 1546 if (SSCOM_ISALIVE(sc) == 0) 1547 return 0; 1548 1549 SSCOM_LOCK(sc); 1550 1551 end = sc->sc_ebuf; 1552 put = sc->sc_rbput; 1553 cc = sc->sc_rbavail; 1554 1555 do { 1556 u_char msts, delta; 1557 u_char uerstat; 1558 uint16_t ufstat; 1559 1560 ufstat = bus_space_read_2(iot, ioh, SSCOM_UFSTAT); 1561 1562 /* XXX: break interrupt with no character? */ 1563 1564 if ( (ufstat & (UFSTAT_RXCOUNT|UFSTAT_RXFULL)) && 1565 !ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1566 1567 while (cc > 0) { 1568 int cn_trapped = 0; 1569 1570 /* get status and received character. 1571 read status register first */ 1572 uerstat = sscom_geterr(iot, ioh); 1573 put[0] = sscom_getc(iot, ioh); 1574 1575 if (ISSET(uerstat, UERSTAT_BREAK)) { 1576 int con_trapped = 0; 1577 cn_check_magic(sc->sc_tty->t_dev, 1578 CNC_BREAK, sscom_cnm_state); 1579 if (con_trapped) 1580 continue; 1581 #if defined(KGDB) 1582 if (ISSET(sc->sc_hwflags, 1583 SSCOM_HW_KGDB)) { 1584 kgdb_connect(1); 1585 continue; 1586 } 1587 #endif 1588 } 1589 1590 put[1] = uerstat; 1591 cn_check_magic(sc->sc_tty->t_dev, 1592 put[0], sscom_cnm_state); 1593 if (!cn_trapped) { 1594 put += 2; 1595 if (put >= end) 1596 put = sc->sc_rbuf; 1597 cc--; 1598 } 1599 1600 ufstat = bus_space_read_2(iot, ioh, SSCOM_UFSTAT); 1601 if ( (ufstat & (UFSTAT_RXFULL|UFSTAT_RXCOUNT)) == 0 ) 1602 break; 1603 } 1604 1605 /* 1606 * Current string of incoming characters ended because 1607 * no more data was available or we ran out of space. 1608 * Schedule a receive event if any data was received. 1609 * If we're out of space, turn off receive interrupts. 1610 */ 1611 sc->sc_rbput = put; 1612 sc->sc_rbavail = cc; 1613 if (!ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) 1614 sc->sc_rx_ready = 1; 1615 1616 /* 1617 * See if we are in danger of overflowing a buffer. If 1618 * so, use hardware flow control to ease the pressure. 1619 */ 1620 if (!ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED) && 1621 cc < sc->sc_r_hiwat) { 1622 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1623 sscom_hwiflow(sc); 1624 } 1625 1626 /* 1627 * If we're out of space, disable receive interrupts 1628 * until the queue has drained a bit. 1629 */ 1630 if (!cc) { 1631 SET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1632 sscom_disable_rxint(sc); 1633 sc->sc_ucon &= ~UCON_ERRINT; 1634 bus_space_write_2(iot, ioh, SSCOM_UCON, sc->sc_ucon); 1635 } 1636 } 1637 1638 1639 msts = sc->read_modem_status(sc); 1640 delta = msts ^ sc->sc_msts; 1641 sc->sc_msts = msts; 1642 1643 #ifdef notyet 1644 /* 1645 * Pulse-per-second (PSS) signals on edge of DCD? 1646 * Process these even if line discipline is ignoring DCD. 1647 */ 1648 if (delta & sc->sc_ppsmask) { 1649 struct timeval tv; 1650 if ((msr & sc->sc_ppsmask) == sc->sc_ppsassert) { 1651 /* XXX nanotime() */ 1652 microtime(&tv); 1653 TIMEVAL_TO_TIMESPEC(&tv, 1654 &sc->ppsinfo.assert_timestamp); 1655 if (sc->ppsparam.mode & PPS_OFFSETASSERT) { 1656 timespecadd(&sc->ppsinfo.assert_timestamp, 1657 &sc->ppsparam.assert_offset, 1658 &sc->ppsinfo.assert_timestamp); 1659 } 1660 1661 #ifdef PPS_SYNC 1662 if (sc->ppsparam.mode & PPS_HARDPPSONASSERT) 1663 hardpps(&tv, tv.tv_usec); 1664 #endif 1665 sc->ppsinfo.assert_sequence++; 1666 sc->ppsinfo.current_mode = sc->ppsparam.mode; 1667 1668 } else if ((msr & sc->sc_ppsmask) == sc->sc_ppsclear) { 1669 /* XXX nanotime() */ 1670 microtime(&tv); 1671 TIMEVAL_TO_TIMESPEC(&tv, 1672 &sc->ppsinfo.clear_timestamp); 1673 if (sc->ppsparam.mode & PPS_OFFSETCLEAR) { 1674 timespecadd(&sc->ppsinfo.clear_timestamp, 1675 &sc->ppsparam.clear_offset, 1676 &sc->ppsinfo.clear_timestamp); 1677 } 1678 1679 #ifdef PPS_SYNC 1680 if (sc->ppsparam.mode & PPS_HARDPPSONCLEAR) 1681 hardpps(&tv, tv.tv_usec); 1682 #endif 1683 sc->ppsinfo.clear_sequence++; 1684 sc->ppsinfo.current_mode = sc->ppsparam.mode; 1685 } 1686 } 1687 #endif 1688 1689 /* 1690 * Process normal status changes 1691 */ 1692 if (ISSET(delta, sc->sc_msr_mask)) { 1693 SET(sc->sc_msr_delta, delta); 1694 1695 /* 1696 * Stop output immediately if we lose the output 1697 * flow control signal or carrier detect. 1698 */ 1699 if (ISSET(~msts, sc->sc_msr_mask)) { 1700 sc->sc_tbc = 0; 1701 sc->sc_heldtbc = 0; 1702 #ifdef SSCOM_DEBUG 1703 if (sscom_debug) 1704 sscomstatus(sc, "sscomintr "); 1705 #endif 1706 } 1707 1708 sc->sc_st_check = 1; 1709 } 1710 1711 /* 1712 * Done handling any receive interrupts. 1713 */ 1714 1715 /* 1716 * If we've delayed a parameter change, do it 1717 * now, and restart * output. 1718 */ 1719 if ((ufstat & UFSTAT_TXCOUNT) == 0) { 1720 /* XXX: we should check transmitter empty also */ 1721 1722 if (sc->sc_heldchange) { 1723 sscom_loadchannelregs(sc); 1724 sc->sc_heldchange = 0; 1725 sc->sc_tbc = sc->sc_heldtbc; 1726 sc->sc_heldtbc = 0; 1727 } 1728 } 1729 1730 1731 } while (0); 1732 1733 SSCOM_UNLOCK(sc); 1734 1735 /* Wake up the poller. */ 1736 softint_schedule(sc->sc_si); 1737 1738 #if NRND > 0 && defined(RND_COM) 1739 rnd_add_uint32(&sc->rnd_source, iir | rsr); 1740 #endif 1741 1742 return 1; 1743 } 1744 1745 int 1746 sscomtxintr(void *arg) 1747 { 1748 struct sscom_softc *sc = arg; 1749 bus_space_tag_t iot = sc->sc_iot; 1750 bus_space_handle_t ioh = sc->sc_ioh; 1751 uint16_t ufstat; 1752 1753 if (SSCOM_ISALIVE(sc) == 0) 1754 return 0; 1755 1756 SSCOM_LOCK(sc); 1757 1758 ufstat = bus_space_read_2(iot, ioh, SSCOM_UFSTAT); 1759 1760 /* 1761 * If we've delayed a parameter change, do it 1762 * now, and restart * output. 1763 */ 1764 if (sc->sc_heldchange && (ufstat & UFSTAT_TXCOUNT) == 0) { 1765 /* XXX: we should check transmitter empty also */ 1766 sscom_loadchannelregs(sc); 1767 sc->sc_heldchange = 0; 1768 sc->sc_tbc = sc->sc_heldtbc; 1769 sc->sc_heldtbc = 0; 1770 } 1771 1772 /* 1773 * See if data can be transmitted as well. Schedule tx 1774 * done event if no data left and tty was marked busy. 1775 */ 1776 if (!ISSET(ufstat,UFSTAT_TXFULL)) { 1777 /* 1778 * Output the next chunk of the contiguous 1779 * buffer, if any. 1780 */ 1781 if (sc->sc_tbc > 0) { 1782 __sscom_output_chunk(sc, ufstat); 1783 } 1784 else { 1785 /* 1786 * Disable transmit sscompletion 1787 * interrupts if necessary. 1788 */ 1789 if (sc->sc_hwflags & SSCOM_HW_TXINT) 1790 sscom_disable_txint(sc); 1791 if (sc->sc_tx_busy) { 1792 sc->sc_tx_busy = 0; 1793 sc->sc_tx_done = 1; 1794 } 1795 } 1796 } 1797 1798 SSCOM_UNLOCK(sc); 1799 1800 /* Wake up the poller. */ 1801 softint_schedule(sc->sc_si); 1802 1803 #if NRND > 0 && defined(RND_COM) 1804 rnd_add_uint32(&sc->rnd_source, iir | rsr); 1805 #endif 1806 1807 return 1; 1808 } 1809 1810 1811 #if defined(KGDB) || defined(SSCOM0CONSOLE) || defined(SSCOM1CONSOLE) 1812 /* 1813 * Initialize UART for use as console or KGDB line. 1814 */ 1815 static int 1816 sscom_init(bus_space_tag_t iot, const struct sscom_uart_info *config, 1817 int rate, int frequency, tcflag_t cflag, bus_space_handle_t *iohp) 1818 { 1819 bus_space_handle_t ioh; 1820 bus_addr_t iobase = config->iobase; 1821 1822 if (bus_space_map(iot, iobase, SSCOM_SIZE, 0, &ioh)) 1823 return ENOMEM; /* ??? */ 1824 1825 bus_space_write_2(iot, ioh, SSCOM_UCON, 0); 1826 bus_space_write_1(iot, ioh, SSCOM_UFCON, 1827 UFCON_TXTRIGGER_8 | UFCON_RXTRIGGER_8 | 1828 UFCON_TXFIFO_RESET | UFCON_RXFIFO_RESET | 1829 UFCON_FIFO_ENABLE ); 1830 /* tx/rx fifo reset are auto-cleared */ 1831 1832 rate = sscomspeed(rate, frequency); 1833 bus_space_write_2(iot, ioh, SSCOM_UBRDIV, rate); 1834 bus_space_write_2(iot, ioh, SSCOM_ULCON, cflag2lcr(cflag)); 1835 1836 /* enable UART */ 1837 bus_space_write_2(iot, ioh, SSCOM_UCON, 1838 UCON_TXMODE_INT|UCON_RXMODE_INT); 1839 bus_space_write_2(iot, ioh, SSCOM_UMCON, UMCON_RTS); 1840 1841 *iohp = ioh; 1842 return 0; 1843 } 1844 1845 #endif 1846 1847 #if defined(SSCOM0CONSOLE) || defined(SSCOM1CONSOLE) 1848 /* 1849 * Following are all routines needed for SSCOM to act as console 1850 */ 1851 struct consdev sscomcons = { 1852 NULL, NULL, sscomcngetc, sscomcnputc, sscomcnpollc, NULL, 1853 NULL, NULL, NODEV, CN_NORMAL 1854 }; 1855 1856 1857 int 1858 sscom_cnattach(bus_space_tag_t iot, const struct sscom_uart_info *config, 1859 int rate, int frequency, tcflag_t cflag) 1860 { 1861 int res; 1862 1863 res = sscom_init(iot, config, rate, frequency, cflag, &sscomconsioh); 1864 if (res) 1865 return res; 1866 1867 cn_tab = &sscomcons; 1868 cn_init_magic(&sscom_cnm_state); 1869 cn_set_magic("\047\001"); /* default magic is BREAK */ 1870 1871 sscomconstag = iot; 1872 sscomconsunit = config->unit; 1873 sscomconsrate = rate; 1874 sscomconscflag = cflag; 1875 1876 return 0; 1877 } 1878 1879 void 1880 sscom_cndetach(void) 1881 { 1882 bus_space_unmap(sscomconstag, sscomconsioh, SSCOM_SIZE); 1883 sscomconstag = NULL; 1884 1885 cn_tab = NULL; 1886 } 1887 1888 /* 1889 * The read-ahead code is so that you can detect pending in-band 1890 * cn_magic in polled mode while doing output rather than having to 1891 * wait until the kernel decides it needs input. 1892 */ 1893 1894 #define MAX_READAHEAD 20 1895 static int sscom_readahead[MAX_READAHEAD]; 1896 static int sscom_readaheadcount = 0; 1897 1898 int 1899 sscomcngetc(dev_t dev) 1900 { 1901 int s = splserial(); 1902 u_char stat, c; 1903 1904 /* got a character from reading things earlier */ 1905 if (sscom_readaheadcount > 0) { 1906 int i; 1907 1908 c = sscom_readahead[0]; 1909 for (i = 1; i < sscom_readaheadcount; i++) { 1910 sscom_readahead[i-1] = sscom_readahead[i]; 1911 } 1912 sscom_readaheadcount--; 1913 splx(s); 1914 return c; 1915 } 1916 1917 /* block until a character becomes available */ 1918 while (!sscom_rxrdy(sscomconstag, sscomconsioh)) 1919 ; 1920 1921 c = sscom_getc(sscomconstag, sscomconsioh); 1922 stat = sscom_geterr(sscomconstag, sscomconsioh); 1923 { 1924 int cn_trapped = 0; /* unused */ 1925 #ifdef DDB 1926 extern int db_active; 1927 if (!db_active) 1928 #endif 1929 cn_check_magic(dev, c, sscom_cnm_state); 1930 } 1931 splx(s); 1932 return c; 1933 } 1934 1935 /* 1936 * Console kernel output character routine. 1937 */ 1938 void 1939 sscomcnputc(dev_t dev, int c) 1940 { 1941 int s = splserial(); 1942 int timo; 1943 1944 int cin, stat; 1945 if (sscom_readaheadcount < MAX_READAHEAD && 1946 sscom_rxrdy(sscomconstag, sscomconsioh)) { 1947 1948 int cn_trapped = 0; 1949 cin = sscom_getc(sscomconstag, sscomconsioh); 1950 stat = sscom_geterr(sscomconstag, sscomconsioh); 1951 cn_check_magic(dev, cin, sscom_cnm_state); 1952 sscom_readahead[sscom_readaheadcount++] = cin; 1953 } 1954 1955 /* wait for any pending transmission to finish */ 1956 timo = 150000; 1957 while (ISSET(bus_space_read_2(sscomconstag, sscomconsioh, SSCOM_UFSTAT), 1958 UFSTAT_TXFULL) && --timo) 1959 continue; 1960 1961 bus_space_write_1(sscomconstag, sscomconsioh, SSCOM_UTXH, c); 1962 SSCOM_BARRIER(sscomconstag, sscomconsioh, BR | BW); 1963 1964 #if 0 1965 /* wait for this transmission to complete */ 1966 timo = 1500000; 1967 while (!ISSET(bus_space_read_1(sscomconstag, sscomconsioh, SSCOM_UTRSTAT), 1968 UTRSTAT_TXEMPTY) && --timo) 1969 continue; 1970 #endif 1971 splx(s); 1972 } 1973 1974 void 1975 sscomcnpollc(dev_t dev, int on) 1976 { 1977 1978 } 1979 1980 #endif /* SSCOM0CONSOLE||SSCOM1CONSOLE */ 1981 1982 #ifdef KGDB 1983 int 1984 sscom_kgdb_attach(bus_space_tag_t iot, const struct sscom_uart_info *config, 1985 int rate, int frequency, tcflag_t cflag) 1986 { 1987 int res; 1988 1989 if (iot == sscomconstag && config->unit == sscomconsunit) { 1990 printf( "console==kgdb_port (%d): kgdb disabled\n", sscomconsunit); 1991 return EBUSY; /* cannot share with console */ 1992 } 1993 1994 res = sscom_init(iot, config, rate, frequency, cflag, &sscom_kgdb_ioh); 1995 if (res) 1996 return res; 1997 1998 kgdb_attach(sscom_kgdb_getc, sscom_kgdb_putc, NULL); 1999 kgdb_dev = 123; /* unneeded, only to satisfy some tests */ 2000 2001 sscom_kgdb_iot = iot; 2002 sscom_kgdb_unit = config->unit; 2003 2004 return 0; 2005 } 2006 2007 /* ARGSUSED */ 2008 int 2009 sscom_kgdb_getc(void *arg) 2010 { 2011 int c, stat; 2012 2013 /* block until a character becomes available */ 2014 while (!sscom_rxrdy(sscom_kgdb_iot, sscom_kgdb_ioh)) 2015 ; 2016 2017 c = sscom_getc(sscom_kgdb_iot, sscom_kgdb_ioh); 2018 stat = sscom_geterr(sscom_kgdb_iot, sscom_kgdb_ioh); 2019 2020 return c; 2021 } 2022 2023 /* ARGSUSED */ 2024 void 2025 sscom_kgdb_putc(void *arg, int c) 2026 { 2027 int timo; 2028 2029 /* wait for any pending transmission to finish */ 2030 timo = 150000; 2031 while (ISSET(bus_space_read_2(sscom_kgdb_iot, sscom_kgdb_ioh, 2032 SSCOM_UFSTAT), UFSTAT_TXFULL) && --timo) 2033 continue; 2034 2035 bus_space_write_1(sscom_kgdb_iot, sscom_kgdb_ioh, SSCOM_UTXH, c); 2036 SSCOM_BARRIER(sscom_kgdb_iot, sscom_kgdb_ioh, BR | BW); 2037 2038 #if 0 2039 /* wait for this transmission to complete */ 2040 timo = 1500000; 2041 while (!ISSET(bus_space_read_1(sscom_kgdb_iot, sscom_kgdb_ioh, 2042 SSCOM_UTRSTAT), UTRSTAT_TXEMPTY) && --timo) 2043 continue; 2044 #endif 2045 } 2046 #endif /* KGDB */ 2047 2048 /* helper function to identify the sscom ports used by 2049 console or KGDB (and not yet autoconf attached) */ 2050 int 2051 sscom_is_console(bus_space_tag_t iot, int unit, 2052 bus_space_handle_t *ioh) 2053 { 2054 bus_space_handle_t help; 2055 2056 if (!sscomconsattached && 2057 iot == sscomconstag && unit == sscomconsunit) 2058 help = sscomconsioh; 2059 #ifdef KGDB 2060 else if (!sscom_kgdb_attached && 2061 iot == sscom_kgdb_iot && unit == sscom_kgdb_unit) 2062 help = sscom_kgdb_ioh; 2063 #endif 2064 else 2065 return 0; 2066 2067 if (ioh) 2068 *ioh = help; 2069 return 1; 2070 } 2071
Indexes created Mon Sep 29 21:09:56 GMT 2025