1 /* $NetBSD: sscom.c,v 1.32 2009/12/09 12:42:59 he 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 1.32 2009/12/09 12:42:59 he 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/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) 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 sscomconsattached = 1; 434 435 sscomconstag = iot; 436 sscomconsioh = ioh; 437 438 /* Make sure the console is always "hardwired". */ 439 delay(1000); /* XXX: wait for output to finish */ 440 SET(sc->sc_hwflags, SSCOM_HW_CONSOLE); 441 SET(sc->sc_swflags, TIOCFLAG_SOFTCAR); 442 443 sc->sc_ucon = UCON_DEBUGPORT; 444 } 445 446 bus_space_write_1(iot, ioh, SSCOM_UFCON, 447 UFCON_TXTRIGGER_8|UFCON_RXTRIGGER_8|UFCON_FIFO_ENABLE| 448 UFCON_TXFIFO_RESET|UFCON_RXFIFO_RESET); 449 450 bus_space_write_1(iot, ioh, SSCOM_UCON, sc->sc_ucon); 451 452 #ifdef KGDB 453 if (ISSET(sc->sc_hwflags, SSCOM_HW_KGDB)) { 454 sscom_kgdb_attached = 1; 455 printf("%s: kgdb\n", sc->sc_dev.dv_xname); 456 sscom_enable_debugport(sc); 457 return; 458 } 459 #endif 460 461 462 463 tp = ttymalloc(); 464 tp->t_oproc = sscomstart; 465 tp->t_param = sscomparam; 466 tp->t_hwiflow = sscomhwiflow; 467 468 sc->sc_tty = tp; 469 sc->sc_rbuf = malloc(sscom_rbuf_size << 1, M_DEVBUF, M_NOWAIT); 470 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 471 sc->sc_rbavail = sscom_rbuf_size; 472 if (sc->sc_rbuf == NULL) { 473 printf("%s: unable to allocate ring buffer\n", 474 sc->sc_dev.dv_xname); 475 return; 476 } 477 sc->sc_ebuf = sc->sc_rbuf + (sscom_rbuf_size << 1); 478 479 tty_attach(tp); 480 481 if (ISSET(sc->sc_hwflags, SSCOM_HW_CONSOLE)) { 482 int maj; 483 484 /* locate the major number */ 485 maj = cdevsw_lookup_major(&sscom_cdevsw); 486 487 cn_tab->cn_dev = makedev(maj, device_unit(&sc->sc_dev)); 488 489 printf("%s: console (major=%d)\n", sc->sc_dev.dv_xname, maj); 490 } 491 492 493 sc->sc_si = softint_establish(SOFTINT_SERIAL, sscomsoft, sc); 494 495 #if NRND > 0 && defined(RND_COM) 496 rnd_attach_source(&sc->rnd_source, sc->sc_dev.dv_xname, 497 RND_TYPE_TTY, 0); 498 #endif 499 500 /* if there are no enable/disable functions, assume the device 501 is always enabled */ 502 503 if (ISSET(sc->sc_hwflags, SSCOM_HW_CONSOLE)) 504 sscom_enable_debugport(sc); 505 else 506 sscom_disable_txrxint(sc); 507 508 SET(sc->sc_hwflags, SSCOM_HW_DEV_OK); 509 } 510 511 int 512 sscom_detach(device_t self, int flags) 513 { 514 struct sscom_softc *sc = device_private(self); 515 516 if (sc->sc_hwflags & (SSCOM_HW_CONSOLE|SSCOM_HW_KGDB)) 517 return EBUSY; 518 519 return 0; 520 } 521 522 int 523 sscom_activate(device_t self, enum devact act) 524 { 525 #ifdef notyet 526 struct sscom_softc *sc = device_private(self); 527 #endif 528 529 switch (act) { 530 case DVACT_DEACTIVATE: 531 #ifdef notyet 532 sc->enabled = 0; 533 #endif 534 return 0; 535 default: 536 return EOPNOTSUPP; 537 } 538 } 539 540 void 541 sscom_shutdown(struct sscom_softc *sc) 542 { 543 #ifdef notyet 544 struct tty *tp = sc->sc_tty; 545 int s; 546 547 s = splserial(); 548 SSCOM_LOCK(sc); 549 550 /* If we were asserting flow control, then deassert it. */ 551 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 552 sscom_hwiflow(sc); 553 554 /* Clear any break condition set with TIOCSBRK. */ 555 sscom_break(sc, 0); 556 557 /* 558 * Hang up if necessary. Wait a bit, so the other side has time to 559 * notice even if we immediately open the port again. 560 * Avoid tsleeping above splhigh(). 561 */ 562 if (ISSET(tp->t_cflag, HUPCL)) { 563 sscom_modem(sc, 0); 564 SSCOM_UNLOCK(sc); 565 splx(s); 566 /* XXX tsleep will only timeout */ 567 (void) tsleep(sc, TTIPRI, ttclos, hz); 568 s = splserial(); 569 SSCOM_LOCK(sc); 570 } 571 572 if (ISSET(sc->sc_hwflags, SSCOM_HW_CONSOLE)) 573 /* interrupt on break */ 574 sc->sc_ucon = UCON_DEBUGPORT; 575 else 576 sc->sc_ucon = 0; 577 bus_space_write_2(sc->sc_iot, sc->sc_ioh, SSCOM_UCON, sc->sc_ucon); 578 579 #ifdef DIAGNOSTIC 580 if (!sc->enabled) 581 panic("sscom_shutdown: not enabled?"); 582 #endif 583 sc->enabled = 0; 584 SSCOM_UNLOCK(sc); 585 splx(s); 586 #endif 587 } 588 589 int 590 sscomopen(dev_t dev, int flag, int mode, struct lwp *l) 591 { 592 struct sscom_softc *sc; 593 struct tty *tp; 594 int s, s2; 595 int error; 596 597 sc = device_lookup_private(&sscom_cd, SSCOMUNIT(dev)); 598 if (sc == NULL || !ISSET(sc->sc_hwflags, SSCOM_HW_DEV_OK) || 599 sc->sc_rbuf == NULL) 600 return ENXIO; 601 602 if (!device_is_active(&sc->sc_dev)) 603 return ENXIO; 604 605 #ifdef KGDB 606 /* 607 * If this is the kgdb port, no other use is permitted. 608 */ 609 if (ISSET(sc->sc_hwflags, SSCOM_HW_KGDB)) 610 return EBUSY; 611 #endif 612 613 tp = sc->sc_tty; 614 615 if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp)) 616 return (EBUSY); 617 618 s = spltty(); 619 620 /* 621 * Do the following iff this is a first open. 622 */ 623 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 624 struct termios t; 625 626 tp->t_dev = dev; 627 628 s2 = splserial(); 629 SSCOM_LOCK(sc); 630 631 /* Turn on interrupts. */ 632 sscom_enable_txrxint(sc); 633 634 /* Fetch the current modem control status, needed later. */ 635 sc->sc_msts = sc->read_modem_status(sc); 636 637 #if 0 638 /* Clear PPS capture state on first open. */ 639 sc->sc_ppsmask = 0; 640 sc->ppsparam.mode = 0; 641 #endif 642 643 SSCOM_UNLOCK(sc); 644 splx(s2); 645 646 /* 647 * Initialize the termios status to the defaults. Add in the 648 * sticky bits from TIOCSFLAGS. 649 */ 650 t.c_ispeed = 0; 651 if (ISSET(sc->sc_hwflags, SSCOM_HW_CONSOLE)) { 652 t.c_ospeed = sscomconsrate; 653 t.c_cflag = sscomconscflag; 654 } else { 655 t.c_ospeed = TTYDEF_SPEED; 656 t.c_cflag = TTYDEF_CFLAG; 657 } 658 if (ISSET(sc->sc_swflags, TIOCFLAG_CLOCAL)) 659 SET(t.c_cflag, CLOCAL); 660 if (ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS)) 661 SET(t.c_cflag, CRTSCTS); 662 if (ISSET(sc->sc_swflags, TIOCFLAG_MDMBUF)) 663 SET(t.c_cflag, MDMBUF); 664 /* Make sure sscomparam() will do something. */ 665 tp->t_ospeed = 0; 666 (void) sscomparam(tp, &t); 667 tp->t_iflag = TTYDEF_IFLAG; 668 tp->t_oflag = TTYDEF_OFLAG; 669 tp->t_lflag = TTYDEF_LFLAG; 670 ttychars(tp); 671 ttsetwater(tp); 672 673 s2 = splserial(); 674 SSCOM_LOCK(sc); 675 676 /* 677 * Turn on DTR. We must always do this, even if carrier is not 678 * present, because otherwise we'd have to use TIOCSDTR 679 * immediately after setting CLOCAL, which applications do not 680 * expect. We always assert DTR while the device is open 681 * unless explicitly requested to deassert it. 682 */ 683 sscom_modem(sc, 1); 684 685 /* Clear the input ring, and unblock. */ 686 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 687 sc->sc_rbavail = sscom_rbuf_size; 688 sscom_iflush(sc); 689 CLR(sc->sc_rx_flags, RX_ANY_BLOCK); 690 sscom_hwiflow(sc); 691 692 if (sscom_debug) 693 sscomstatus(sc, "sscomopen "); 694 695 SSCOM_UNLOCK(sc); 696 splx(s2); 697 } 698 699 splx(s); 700 701 error = ttyopen(tp, SSCOMDIALOUT(dev), ISSET(flag, O_NONBLOCK)); 702 if (error) 703 goto bad; 704 705 error = (*tp->t_linesw->l_open)(dev, tp); 706 if (error) 707 goto bad; 708 709 return 0; 710 711 bad: 712 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 713 /* 714 * We failed to open the device, and nobody else had it opened. 715 * Clean up the state as appropriate. 716 */ 717 sscom_shutdown(sc); 718 } 719 720 return error; 721 } 722 723 int 724 sscomclose(dev_t dev, int flag, int mode, struct lwp *l) 725 { 726 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(dev)); 727 struct tty *tp = sc->sc_tty; 728 729 /* XXX This is for cons.c. */ 730 if (!ISSET(tp->t_state, TS_ISOPEN)) 731 return 0; 732 733 (*tp->t_linesw->l_close)(tp, flag); 734 ttyclose(tp); 735 736 if (SSCOM_ISALIVE(sc) == 0) 737 return 0; 738 739 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 740 /* 741 * Although we got a last close, the device may still be in 742 * use; e.g. if this was the dialout node, and there are still 743 * processes waiting for carrier on the non-dialout node. 744 */ 745 sscom_shutdown(sc); 746 } 747 748 return 0; 749 } 750 751 int 752 sscomread(dev_t dev, struct uio *uio, int flag) 753 { 754 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(dev)); 755 struct tty *tp = sc->sc_tty; 756 757 if (SSCOM_ISALIVE(sc) == 0) 758 return EIO; 759 760 return (*tp->t_linesw->l_read)(tp, uio, flag); 761 } 762 763 int 764 sscomwrite(dev_t dev, struct uio *uio, int flag) 765 { 766 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(dev)); 767 struct tty *tp = sc->sc_tty; 768 769 if (SSCOM_ISALIVE(sc) == 0) 770 return EIO; 771 772 return (*tp->t_linesw->l_write)(tp, uio, flag); 773 } 774 775 int 776 sscompoll(dev_t dev, int events, struct lwp *l) 777 { 778 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(dev)); 779 struct tty *tp = sc->sc_tty; 780 781 if (SSCOM_ISALIVE(sc) == 0) 782 return EIO; 783 784 return (*tp->t_linesw->l_poll)(tp, events, l); 785 } 786 787 struct tty * 788 sscomtty(dev_t dev) 789 { 790 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(dev)); 791 struct tty *tp = sc->sc_tty; 792 793 return tp; 794 } 795 796 int 797 sscomioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 798 { 799 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(dev)); 800 struct tty *tp = sc->sc_tty; 801 int error; 802 int s; 803 804 if (SSCOM_ISALIVE(sc) == 0) 805 return EIO; 806 807 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 808 if (error != EPASSTHROUGH) 809 return error; 810 811 error = ttioctl(tp, cmd, data, flag, l); 812 if (error != EPASSTHROUGH) 813 return error; 814 815 error = 0; 816 817 s = splserial(); 818 SSCOM_LOCK(sc); 819 820 switch (cmd) { 821 case TIOCSBRK: 822 sscom_break(sc, 1); 823 break; 824 825 case TIOCCBRK: 826 sscom_break(sc, 0); 827 break; 828 829 case TIOCSDTR: 830 sscom_modem(sc, 1); 831 break; 832 833 case TIOCCDTR: 834 sscom_modem(sc, 0); 835 break; 836 837 case TIOCGFLAGS: 838 *(int *)data = sc->sc_swflags; 839 break; 840 841 case TIOCSFLAGS: 842 error = kauth_authorize_device_tty(l->l_cred, 843 KAUTH_DEVICE_TTY_PRIVSET, tp); 844 if (error) 845 break; 846 sc->sc_swflags = *(int *)data; 847 break; 848 849 case TIOCMSET: 850 case TIOCMBIS: 851 case TIOCMBIC: 852 tiocm_to_sscom(sc, cmd, *(int *)data); 853 break; 854 855 case TIOCMGET: 856 *(int *)data = sscom_to_tiocm(sc); 857 break; 858 859 default: 860 error = EPASSTHROUGH; 861 break; 862 } 863 864 SSCOM_UNLOCK(sc); 865 splx(s); 866 867 if (sscom_debug) 868 sscomstatus(sc, "sscomioctl "); 869 870 return error; 871 } 872 873 integrate void 874 sscom_schedrx(struct sscom_softc *sc) 875 { 876 877 sc->sc_rx_ready = 1; 878 879 /* Wake up the poller. */ 880 softint_schedule(sc->sc_si); 881 } 882 883 static void 884 sscom_break(struct sscom_softc *sc, int onoff) 885 { 886 887 if (onoff) 888 SET(sc->sc_ucon, UCON_SBREAK); 889 else 890 CLR(sc->sc_ucon, UCON_SBREAK); 891 892 if (!sc->sc_heldchange) { 893 if (sc->sc_tx_busy) { 894 sc->sc_heldtbc = sc->sc_tbc; 895 sc->sc_tbc = 0; 896 sc->sc_heldchange = 1; 897 } else 898 sscom_loadchannelregs(sc); 899 } 900 } 901 902 static void 903 sscom_modem(struct sscom_softc *sc, int onoff) 904 { 905 if (onoff) 906 SET(sc->sc_umcon, UMCON_DTR); 907 else 908 CLR(sc->sc_umcon, UMCON_DTR); 909 910 if (!sc->sc_heldchange) { 911 if (sc->sc_tx_busy) { 912 sc->sc_heldtbc = sc->sc_tbc; 913 sc->sc_tbc = 0; 914 sc->sc_heldchange = 1; 915 } else 916 sscom_loadchannelregs(sc); 917 } 918 } 919 920 static void 921 tiocm_to_sscom(struct sscom_softc *sc, u_long how, int ttybits) 922 { 923 u_char sscombits; 924 925 sscombits = 0; 926 if (ISSET(ttybits, TIOCM_DTR)) 927 sscombits = UMCON_DTR; 928 if (ISSET(ttybits, TIOCM_RTS)) 929 SET(sscombits, UMCON_RTS); 930 931 switch (how) { 932 case TIOCMBIC: 933 CLR(sc->sc_umcon, sscombits); 934 break; 935 936 case TIOCMBIS: 937 SET(sc->sc_umcon, sscombits); 938 break; 939 940 case TIOCMSET: 941 CLR(sc->sc_umcon, UMCON_DTR); 942 SET(sc->sc_umcon, sscombits); 943 break; 944 } 945 946 if (!sc->sc_heldchange) { 947 if (sc->sc_tx_busy) { 948 sc->sc_heldtbc = sc->sc_tbc; 949 sc->sc_tbc = 0; 950 sc->sc_heldchange = 1; 951 } else 952 sscom_loadchannelregs(sc); 953 } 954 } 955 956 static int 957 sscom_to_tiocm(struct sscom_softc *sc) 958 { 959 u_char sscombits; 960 int ttybits = 0; 961 962 sscombits = sc->sc_umcon; 963 #if 0 964 if (ISSET(sscombits, MCR_DTR)) 965 SET(ttybits, TIOCM_DTR); 966 #endif 967 if (ISSET(sscombits, UMCON_RTS)) 968 SET(ttybits, TIOCM_RTS); 969 970 sscombits = sc->sc_msts; 971 if (ISSET(sscombits, MSTS_DCD)) 972 SET(ttybits, TIOCM_CD); 973 if (ISSET(sscombits, MSTS_DSR)) 974 SET(ttybits, TIOCM_DSR); 975 if (ISSET(sscombits, MSTS_CTS)) 976 SET(ttybits, TIOCM_CTS); 977 978 if (sc->sc_ucon != 0) 979 SET(ttybits, TIOCM_LE); 980 981 return ttybits; 982 } 983 984 static int 985 cflag2lcr(tcflag_t cflag) 986 { 987 u_char lcr = ULCON_PARITY_NONE; 988 989 switch (cflag & (PARENB|PARODD)) { 990 case PARENB|PARODD: lcr = ULCON_PARITY_ODD; break; 991 case PARENB: lcr = ULCON_PARITY_EVEN; 992 } 993 994 switch (ISSET(cflag, CSIZE)) { 995 case CS5: 996 SET(lcr, ULCON_LENGTH_5); 997 break; 998 case CS6: 999 SET(lcr, ULCON_LENGTH_6); 1000 break; 1001 case CS7: 1002 SET(lcr, ULCON_LENGTH_7); 1003 break; 1004 case CS8: 1005 SET(lcr, ULCON_LENGTH_8); 1006 break; 1007 } 1008 if (ISSET(cflag, CSTOPB)) 1009 SET(lcr, ULCON_STOP); 1010 1011 return lcr; 1012 } 1013 1014 int 1015 sscomparam(struct tty *tp, struct termios *t) 1016 { 1017 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(tp->t_dev)); 1018 int ospeed; 1019 u_char lcr; 1020 int s; 1021 1022 if (SSCOM_ISALIVE(sc) == 0) 1023 return EIO; 1024 1025 ospeed = sscomspeed(t->c_ospeed, sc->sc_frequency); 1026 1027 /* Check requested parameters. */ 1028 if (ospeed < 0) 1029 return EINVAL; 1030 if (t->c_ispeed && t->c_ispeed != t->c_ospeed) 1031 return EINVAL; 1032 1033 /* 1034 * For the console, always force CLOCAL and !HUPCL, so that the port 1035 * is always active. 1036 */ 1037 if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) || 1038 ISSET(sc->sc_hwflags, SSCOM_HW_CONSOLE)) { 1039 SET(t->c_cflag, CLOCAL); 1040 CLR(t->c_cflag, HUPCL); 1041 } 1042 1043 /* 1044 * If there were no changes, don't do anything. This avoids dropping 1045 * input and improves performance when all we did was frob things like 1046 * VMIN and VTIME. 1047 */ 1048 if (tp->t_ospeed == t->c_ospeed && 1049 tp->t_cflag == t->c_cflag) 1050 return 0; 1051 1052 lcr = cflag2lcr(t->c_cflag); 1053 1054 s = splserial(); 1055 SSCOM_LOCK(sc); 1056 1057 sc->sc_ulcon = lcr; 1058 1059 /* 1060 * If we're not in a mode that assumes a connection is present, then 1061 * ignore carrier changes. 1062 */ 1063 if (ISSET(t->c_cflag, CLOCAL | MDMBUF)) 1064 sc->sc_msr_dcd = 0; 1065 else 1066 sc->sc_msr_dcd = MSTS_DCD; 1067 1068 /* 1069 * Set the flow control pins depending on the current flow control 1070 * mode. 1071 */ 1072 if (ISSET(t->c_cflag, CRTSCTS)) { 1073 sc->sc_mcr_dtr = UMCON_DTR; 1074 sc->sc_mcr_rts = UMCON_RTS; 1075 sc->sc_msr_cts = MSTS_CTS; 1076 } 1077 else if (ISSET(t->c_cflag, MDMBUF)) { 1078 /* 1079 * For DTR/DCD flow control, make sure we don't toggle DTR for 1080 * carrier detection. 1081 */ 1082 sc->sc_mcr_dtr = 0; 1083 sc->sc_mcr_rts = UMCON_DTR; 1084 sc->sc_msr_cts = MSTS_DCD; 1085 } 1086 else { 1087 /* 1088 * If no flow control, then always set RTS. This will make 1089 * the other side happy if it mistakenly thinks we're doing 1090 * RTS/CTS flow control. 1091 */ 1092 sc->sc_mcr_dtr = UMCON_DTR | UMCON_RTS; 1093 sc->sc_mcr_rts = 0; 1094 sc->sc_msr_cts = 0; 1095 if (ISSET(sc->sc_umcon, UMCON_DTR)) 1096 SET(sc->sc_umcon, UMCON_RTS); 1097 else 1098 CLR(sc->sc_umcon, UMCON_RTS); 1099 } 1100 sc->sc_msr_mask = sc->sc_msr_cts | sc->sc_msr_dcd; 1101 1102 if (ospeed == 0) 1103 CLR(sc->sc_umcon, sc->sc_mcr_dtr); 1104 else 1105 SET(sc->sc_umcon, sc->sc_mcr_dtr); 1106 1107 sc->sc_ubrdiv = ospeed; 1108 1109 /* And copy to tty. */ 1110 tp->t_ispeed = 0; 1111 tp->t_ospeed = t->c_ospeed; 1112 tp->t_cflag = t->c_cflag; 1113 1114 if (!sc->sc_heldchange) { 1115 if (sc->sc_tx_busy) { 1116 sc->sc_heldtbc = sc->sc_tbc; 1117 sc->sc_tbc = 0; 1118 sc->sc_heldchange = 1; 1119 } else 1120 sscom_loadchannelregs(sc); 1121 } 1122 1123 if (!ISSET(t->c_cflag, CHWFLOW)) { 1124 /* Disable the high water mark. */ 1125 sc->sc_r_hiwat = 0; 1126 sc->sc_r_lowat = 0; 1127 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1128 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1129 sscom_schedrx(sc); 1130 } 1131 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 1132 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 1133 sscom_hwiflow(sc); 1134 } 1135 } else { 1136 sc->sc_r_hiwat = sscom_rbuf_hiwat; 1137 sc->sc_r_lowat = sscom_rbuf_lowat; 1138 } 1139 1140 SSCOM_UNLOCK(sc); 1141 splx(s); 1142 1143 /* 1144 * Update the tty layer's idea of the carrier bit, in case we changed 1145 * CLOCAL or MDMBUF. We don't hang up here; we only do that by 1146 * explicit request. 1147 */ 1148 (void) (*tp->t_linesw->l_modem)(tp, ISSET(sc->sc_msts, MSTS_DCD)); 1149 1150 if (sscom_debug) 1151 sscomstatus(sc, "sscomparam "); 1152 1153 if (!ISSET(t->c_cflag, CHWFLOW)) { 1154 if (sc->sc_tx_stopped) { 1155 sc->sc_tx_stopped = 0; 1156 sscomstart(tp); 1157 } 1158 } 1159 1160 return 0; 1161 } 1162 1163 static void 1164 sscom_iflush(struct sscom_softc *sc) 1165 { 1166 bus_space_tag_t iot = sc->sc_iot; 1167 bus_space_handle_t ioh = sc->sc_ioh; 1168 int timo; 1169 1170 1171 timo = 50000; 1172 /* flush any pending I/O */ 1173 while ( sscom_rxrdy(iot, ioh) && --timo) 1174 (void)sscom_getc(iot,ioh); 1175 #ifdef DIAGNOSTIC 1176 if (!timo) 1177 printf("%s: sscom_iflush timeout\n", sc->sc_dev.dv_xname); 1178 #endif 1179 } 1180 1181 static void 1182 sscom_loadchannelregs(struct sscom_softc *sc) 1183 { 1184 bus_space_tag_t iot = sc->sc_iot; 1185 bus_space_handle_t ioh = sc->sc_ioh; 1186 1187 /* XXXXX necessary? */ 1188 sscom_iflush(sc); 1189 1190 bus_space_write_2(iot, ioh, SSCOM_UCON, 0); 1191 1192 #if 0 1193 if (ISSET(sc->sc_hwflags, COM_HW_FLOW)) { 1194 bus_space_write_1(iot, ioh, com_lcr, LCR_EERS); 1195 bus_space_write_1(iot, ioh, com_efr, sc->sc_efr); 1196 } 1197 #endif 1198 1199 bus_space_write_2(iot, ioh, SSCOM_UBRDIV, sc->sc_ubrdiv); 1200 bus_space_write_1(iot, ioh, SSCOM_ULCON, sc->sc_ulcon); 1201 sc->set_modem_control(sc); 1202 bus_space_write_2(iot, ioh, SSCOM_UCON, sc->sc_ucon); 1203 } 1204 1205 static int 1206 sscomhwiflow(struct tty *tp, int block) 1207 { 1208 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(tp->t_dev)); 1209 int s; 1210 1211 if (SSCOM_ISALIVE(sc) == 0) 1212 return 0; 1213 1214 if (sc->sc_mcr_rts == 0) 1215 return 0; 1216 1217 s = splserial(); 1218 SSCOM_LOCK(sc); 1219 1220 if (block) { 1221 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1222 SET(sc->sc_rx_flags, RX_TTY_BLOCKED); 1223 sscom_hwiflow(sc); 1224 } 1225 } else { 1226 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1227 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1228 sscom_schedrx(sc); 1229 } 1230 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1231 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED); 1232 sscom_hwiflow(sc); 1233 } 1234 } 1235 1236 SSCOM_UNLOCK(sc); 1237 splx(s); 1238 return 1; 1239 } 1240 1241 /* 1242 * (un)block input via hw flowcontrol 1243 */ 1244 static void 1245 sscom_hwiflow(struct sscom_softc *sc) 1246 { 1247 if (sc->sc_mcr_rts == 0) 1248 return; 1249 1250 if (ISSET(sc->sc_rx_flags, RX_ANY_BLOCK)) { 1251 CLR(sc->sc_umcon, sc->sc_mcr_rts); 1252 CLR(sc->sc_mcr_active, sc->sc_mcr_rts); 1253 } else { 1254 SET(sc->sc_umcon, sc->sc_mcr_rts); 1255 SET(sc->sc_mcr_active, sc->sc_mcr_rts); 1256 } 1257 sc->set_modem_control(sc); 1258 } 1259 1260 1261 void 1262 sscomstart(struct tty *tp) 1263 { 1264 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(tp->t_dev)); 1265 int s; 1266 1267 if (SSCOM_ISALIVE(sc) == 0) 1268 return; 1269 1270 s = spltty(); 1271 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 1272 goto out; 1273 if (sc->sc_tx_stopped) 1274 goto out; 1275 if (!ttypull(tp)) 1276 goto out; 1277 1278 /* Grab the first contiguous region of buffer space. */ 1279 { 1280 u_char *tba; 1281 int tbc; 1282 1283 tba = tp->t_outq.c_cf; 1284 tbc = ndqb(&tp->t_outq, 0); 1285 1286 (void)splserial(); 1287 SSCOM_LOCK(sc); 1288 1289 sc->sc_tba = tba; 1290 sc->sc_tbc = tbc; 1291 } 1292 1293 SET(tp->t_state, TS_BUSY); 1294 sc->sc_tx_busy = 1; 1295 1296 /* Output the first chunk of the contiguous buffer. */ 1297 sscom_output_chunk(sc); 1298 1299 /* Enable transmit completion interrupts if necessary. */ 1300 if ((sc->sc_hwflags & SSCOM_HW_TXINT) == 0) 1301 sscom_enable_txint(sc); 1302 1303 SSCOM_UNLOCK(sc); 1304 out: 1305 splx(s); 1306 return; 1307 } 1308 1309 /* 1310 * Stop output on a line. 1311 */ 1312 void 1313 sscomstop(struct tty *tp, int flag) 1314 { 1315 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(tp->t_dev)); 1316 int s; 1317 1318 s = splserial(); 1319 SSCOM_LOCK(sc); 1320 if (ISSET(tp->t_state, TS_BUSY)) { 1321 /* Stop transmitting at the next chunk. */ 1322 sc->sc_tbc = 0; 1323 sc->sc_heldtbc = 0; 1324 if (!ISSET(tp->t_state, TS_TTSTOP)) 1325 SET(tp->t_state, TS_FLUSH); 1326 } 1327 SSCOM_UNLOCK(sc); 1328 splx(s); 1329 } 1330 1331 void 1332 sscomdiag(void *arg) 1333 { 1334 struct sscom_softc *sc = arg; 1335 int overflows, floods; 1336 int s; 1337 1338 s = splserial(); 1339 SSCOM_LOCK(sc); 1340 overflows = sc->sc_overflows; 1341 sc->sc_overflows = 0; 1342 floods = sc->sc_floods; 1343 sc->sc_floods = 0; 1344 sc->sc_errors = 0; 1345 SSCOM_UNLOCK(sc); 1346 splx(s); 1347 1348 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1349 sc->sc_dev.dv_xname, 1350 overflows, overflows == 1 ? "" : "s", 1351 floods, floods == 1 ? "" : "s"); 1352 } 1353 1354 integrate void 1355 sscom_rxsoft(struct sscom_softc *sc, struct tty *tp) 1356 { 1357 int (*rint) (int, struct tty *) = tp->t_linesw->l_rint; 1358 u_char *get, *end; 1359 u_int cc, scc; 1360 u_char rsr; 1361 int code; 1362 int s; 1363 1364 end = sc->sc_ebuf; 1365 get = sc->sc_rbget; 1366 scc = cc = sscom_rbuf_size - sc->sc_rbavail; 1367 1368 if (cc == sscom_rbuf_size) { 1369 sc->sc_floods++; 1370 if (sc->sc_errors++ == 0) 1371 callout_reset(&sc->sc_diag_callout, 60 * hz, 1372 sscomdiag, sc); 1373 } 1374 1375 while (cc) { 1376 code = get[0]; 1377 rsr = get[1]; 1378 if (rsr) { 1379 if (ISSET(rsr, UERSTAT_OVERRUN)) { 1380 sc->sc_overflows++; 1381 if (sc->sc_errors++ == 0) 1382 callout_reset(&sc->sc_diag_callout, 1383 60 * hz, sscomdiag, sc); 1384 } 1385 if (ISSET(rsr, UERSTAT_BREAK | UERSTAT_FRAME)) 1386 SET(code, TTY_FE); 1387 if (ISSET(rsr, UERSTAT_PARITY)) 1388 SET(code, TTY_PE); 1389 } 1390 if ((*rint)(code, tp) == -1) { 1391 /* 1392 * The line discipline's buffer is out of space. 1393 */ 1394 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1395 /* 1396 * We're either not using flow control, or the 1397 * line discipline didn't tell us to block for 1398 * some reason. Either way, we have no way to 1399 * know when there's more space available, so 1400 * just drop the rest of the data. 1401 */ 1402 get += cc << 1; 1403 if (get >= end) 1404 get -= sscom_rbuf_size << 1; 1405 cc = 0; 1406 } else { 1407 /* 1408 * Don't schedule any more receive processing 1409 * until the line discipline tells us there's 1410 * space available (through sscomhwiflow()). 1411 * Leave the rest of the data in the input 1412 * buffer. 1413 */ 1414 SET(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1415 } 1416 break; 1417 } 1418 get += 2; 1419 if (get >= end) 1420 get = sc->sc_rbuf; 1421 cc--; 1422 } 1423 1424 if (cc != scc) { 1425 sc->sc_rbget = get; 1426 s = splserial(); 1427 SSCOM_LOCK(sc); 1428 1429 cc = sc->sc_rbavail += scc - cc; 1430 /* Buffers should be ok again, release possible block. */ 1431 if (cc >= sc->sc_r_lowat) { 1432 if (ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1433 CLR(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1434 sscom_enable_rxint(sc); 1435 sc->sc_ucon |= UCON_ERRINT; 1436 bus_space_write_2(sc->sc_iot, sc->sc_ioh, SSCOM_UCON, 1437 sc->sc_ucon); 1438 1439 } 1440 if (ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED)) { 1441 CLR(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1442 sscom_hwiflow(sc); 1443 } 1444 } 1445 SSCOM_UNLOCK(sc); 1446 splx(s); 1447 } 1448 } 1449 1450 integrate void 1451 sscom_txsoft(struct sscom_softc *sc, struct tty *tp) 1452 { 1453 1454 CLR(tp->t_state, TS_BUSY); 1455 if (ISSET(tp->t_state, TS_FLUSH)) 1456 CLR(tp->t_state, TS_FLUSH); 1457 else 1458 ndflush(&tp->t_outq, (int)(sc->sc_tba - tp->t_outq.c_cf)); 1459 (*tp->t_linesw->l_start)(tp); 1460 } 1461 1462 integrate void 1463 sscom_stsoft(struct sscom_softc *sc, struct tty *tp) 1464 { 1465 u_char msr, delta; 1466 int s; 1467 1468 s = splserial(); 1469 SSCOM_LOCK(sc); 1470 msr = sc->sc_msts; 1471 delta = sc->sc_msr_delta; 1472 sc->sc_msr_delta = 0; 1473 SSCOM_UNLOCK(sc); 1474 splx(s); 1475 1476 if (ISSET(delta, sc->sc_msr_dcd)) { 1477 /* 1478 * Inform the tty layer that carrier detect changed. 1479 */ 1480 (void) (*tp->t_linesw->l_modem)(tp, ISSET(msr, MSTS_DCD)); 1481 } 1482 1483 if (ISSET(delta, sc->sc_msr_cts)) { 1484 /* Block or unblock output according to flow control. */ 1485 if (ISSET(msr, sc->sc_msr_cts)) { 1486 sc->sc_tx_stopped = 0; 1487 (*tp->t_linesw->l_start)(tp); 1488 } else { 1489 sc->sc_tx_stopped = 1; 1490 } 1491 } 1492 1493 if (sscom_debug) 1494 sscomstatus(sc, "sscom_stsoft"); 1495 } 1496 1497 void 1498 sscomsoft(void *arg) 1499 { 1500 struct sscom_softc *sc = arg; 1501 struct tty *tp; 1502 1503 if (SSCOM_ISALIVE(sc) == 0) 1504 return; 1505 1506 { 1507 tp = sc->sc_tty; 1508 1509 if (sc->sc_rx_ready) { 1510 sc->sc_rx_ready = 0; 1511 sscom_rxsoft(sc, tp); 1512 } 1513 1514 if (sc->sc_st_check) { 1515 sc->sc_st_check = 0; 1516 sscom_stsoft(sc, tp); 1517 } 1518 1519 if (sc->sc_tx_done) { 1520 sc->sc_tx_done = 0; 1521 sscom_txsoft(sc, tp); 1522 } 1523 } 1524 } 1525 1526 1527 int 1528 sscomrxintr(void *arg) 1529 { 1530 struct sscom_softc *sc = arg; 1531 bus_space_tag_t iot = sc->sc_iot; 1532 bus_space_handle_t ioh = sc->sc_ioh; 1533 u_char *put, *end; 1534 u_int cc; 1535 1536 if (SSCOM_ISALIVE(sc) == 0) 1537 return 0; 1538 1539 SSCOM_LOCK(sc); 1540 1541 end = sc->sc_ebuf; 1542 put = sc->sc_rbput; 1543 cc = sc->sc_rbavail; 1544 1545 do { 1546 u_char msts, delta; 1547 u_char uerstat; 1548 uint16_t ufstat; 1549 1550 ufstat = bus_space_read_2(iot, ioh, SSCOM_UFSTAT); 1551 1552 /* XXX: break interrupt with no character? */ 1553 1554 if ( (ufstat & (UFSTAT_RXCOUNT|UFSTAT_RXFULL)) && 1555 !ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1556 1557 while (cc > 0) { 1558 int cn_trapped = 0; 1559 1560 /* get status and received character. 1561 read status register first */ 1562 uerstat = sscom_geterr(iot, ioh); 1563 put[0] = sscom_getc(iot, ioh); 1564 1565 if (ISSET(uerstat, UERSTAT_BREAK)) { 1566 int con_trapped = 0; 1567 cn_check_magic(sc->sc_tty->t_dev, 1568 CNC_BREAK, sscom_cnm_state); 1569 if (con_trapped) 1570 continue; 1571 #if defined(KGDB) 1572 if (ISSET(sc->sc_hwflags, 1573 SSCOM_HW_KGDB)) { 1574 kgdb_connect(1); 1575 continue; 1576 } 1577 #endif 1578 } 1579 1580 put[1] = uerstat; 1581 cn_check_magic(sc->sc_tty->t_dev, 1582 put[0], sscom_cnm_state); 1583 if (!cn_trapped) { 1584 put += 2; 1585 if (put >= end) 1586 put = sc->sc_rbuf; 1587 cc--; 1588 } 1589 1590 ufstat = bus_space_read_2(iot, ioh, SSCOM_UFSTAT); 1591 if ( (ufstat & (UFSTAT_RXFULL|UFSTAT_RXCOUNT)) == 0 ) 1592 break; 1593 } 1594 1595 /* 1596 * Current string of incoming characters ended because 1597 * no more data was available or we ran out of space. 1598 * Schedule a receive event if any data was received. 1599 * If we're out of space, turn off receive interrupts. 1600 */ 1601 sc->sc_rbput = put; 1602 sc->sc_rbavail = cc; 1603 if (!ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) 1604 sc->sc_rx_ready = 1; 1605 1606 /* 1607 * See if we are in danger of overflowing a buffer. If 1608 * so, use hardware flow control to ease the pressure. 1609 */ 1610 if (!ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED) && 1611 cc < sc->sc_r_hiwat) { 1612 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1613 sscom_hwiflow(sc); 1614 } 1615 1616 /* 1617 * If we're out of space, disable receive interrupts 1618 * until the queue has drained a bit. 1619 */ 1620 if (!cc) { 1621 SET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1622 sscom_disable_rxint(sc); 1623 sc->sc_ucon &= ~UCON_ERRINT; 1624 bus_space_write_2(iot, ioh, SSCOM_UCON, sc->sc_ucon); 1625 } 1626 } 1627 1628 1629 msts = sc->read_modem_status(sc); 1630 delta = msts ^ sc->sc_msts; 1631 sc->sc_msts = msts; 1632 1633 #ifdef notyet 1634 /* 1635 * Pulse-per-second (PSS) signals on edge of DCD? 1636 * Process these even if line discipline is ignoring DCD. 1637 */ 1638 if (delta & sc->sc_ppsmask) { 1639 struct timeval tv; 1640 if ((msr & sc->sc_ppsmask) == sc->sc_ppsassert) { 1641 /* XXX nanotime() */ 1642 microtime(&tv); 1643 TIMEVAL_TO_TIMESPEC(&tv, 1644 &sc->ppsinfo.assert_timestamp); 1645 if (sc->ppsparam.mode & PPS_OFFSETASSERT) { 1646 timespecadd(&sc->ppsinfo.assert_timestamp, 1647 &sc->ppsparam.assert_offset, 1648 &sc->ppsinfo.assert_timestamp); 1649 } 1650 1651 #ifdef PPS_SYNC 1652 if (sc->ppsparam.mode & PPS_HARDPPSONASSERT) 1653 hardpps(&tv, tv.tv_usec); 1654 #endif 1655 sc->ppsinfo.assert_sequence++; 1656 sc->ppsinfo.current_mode = sc->ppsparam.mode; 1657 1658 } else if ((msr & sc->sc_ppsmask) == sc->sc_ppsclear) { 1659 /* XXX nanotime() */ 1660 microtime(&tv); 1661 TIMEVAL_TO_TIMESPEC(&tv, 1662 &sc->ppsinfo.clear_timestamp); 1663 if (sc->ppsparam.mode & PPS_OFFSETCLEAR) { 1664 timespecadd(&sc->ppsinfo.clear_timestamp, 1665 &sc->ppsparam.clear_offset, 1666 &sc->ppsinfo.clear_timestamp); 1667 } 1668 1669 #ifdef PPS_SYNC 1670 if (sc->ppsparam.mode & PPS_HARDPPSONCLEAR) 1671 hardpps(&tv, tv.tv_usec); 1672 #endif 1673 sc->ppsinfo.clear_sequence++; 1674 sc->ppsinfo.current_mode = sc->ppsparam.mode; 1675 } 1676 } 1677 #endif 1678 1679 /* 1680 * Process normal status changes 1681 */ 1682 if (ISSET(delta, sc->sc_msr_mask)) { 1683 SET(sc->sc_msr_delta, delta); 1684 1685 /* 1686 * Stop output immediately if we lose the output 1687 * flow control signal or carrier detect. 1688 */ 1689 if (ISSET(~msts, sc->sc_msr_mask)) { 1690 sc->sc_tbc = 0; 1691 sc->sc_heldtbc = 0; 1692 #ifdef SSCOM_DEBUG 1693 if (sscom_debug) 1694 sscomstatus(sc, "sscomintr "); 1695 #endif 1696 } 1697 1698 sc->sc_st_check = 1; 1699 } 1700 1701 /* 1702 * Done handling any receive interrupts. 1703 */ 1704 1705 /* 1706 * If we've delayed a parameter change, do it 1707 * now, and restart * output. 1708 */ 1709 if ((ufstat & UFSTAT_TXCOUNT) == 0) { 1710 /* XXX: we should check transmitter empty also */ 1711 1712 if (sc->sc_heldchange) { 1713 sscom_loadchannelregs(sc); 1714 sc->sc_heldchange = 0; 1715 sc->sc_tbc = sc->sc_heldtbc; 1716 sc->sc_heldtbc = 0; 1717 } 1718 } 1719 1720 1721 } while (0); 1722 1723 SSCOM_UNLOCK(sc); 1724 1725 /* Wake up the poller. */ 1726 softint_schedule(sc->sc_si); 1727 1728 #if NRND > 0 && defined(RND_COM) 1729 rnd_add_uint32(&sc->rnd_source, iir | rsr); 1730 #endif 1731 1732 return 1; 1733 } 1734 1735 int 1736 sscomtxintr(void *arg) 1737 { 1738 struct sscom_softc *sc = arg; 1739 bus_space_tag_t iot = sc->sc_iot; 1740 bus_space_handle_t ioh = sc->sc_ioh; 1741 uint16_t ufstat; 1742 1743 if (SSCOM_ISALIVE(sc) == 0) 1744 return 0; 1745 1746 SSCOM_LOCK(sc); 1747 1748 ufstat = bus_space_read_2(iot, ioh, SSCOM_UFSTAT); 1749 1750 /* 1751 * If we've delayed a parameter change, do it 1752 * now, and restart * output. 1753 */ 1754 if (sc->sc_heldchange && (ufstat & UFSTAT_TXCOUNT) == 0) { 1755 /* XXX: we should check transmitter empty also */ 1756 sscom_loadchannelregs(sc); 1757 sc->sc_heldchange = 0; 1758 sc->sc_tbc = sc->sc_heldtbc; 1759 sc->sc_heldtbc = 0; 1760 } 1761 1762 /* 1763 * See if data can be transmitted as well. Schedule tx 1764 * done event if no data left and tty was marked busy. 1765 */ 1766 if (!ISSET(ufstat,UFSTAT_TXFULL)) { 1767 /* 1768 * Output the next chunk of the contiguous 1769 * buffer, if any. 1770 */ 1771 if (sc->sc_tbc > 0) { 1772 __sscom_output_chunk(sc, ufstat); 1773 } 1774 else { 1775 /* 1776 * Disable transmit sscompletion 1777 * interrupts if necessary. 1778 */ 1779 if (sc->sc_hwflags & SSCOM_HW_TXINT) 1780 sscom_disable_txint(sc); 1781 if (sc->sc_tx_busy) { 1782 sc->sc_tx_busy = 0; 1783 sc->sc_tx_done = 1; 1784 } 1785 } 1786 } 1787 1788 SSCOM_UNLOCK(sc); 1789 1790 /* Wake up the poller. */ 1791 softint_schedule(sc->sc_si); 1792 1793 #if NRND > 0 && defined(RND_COM) 1794 rnd_add_uint32(&sc->rnd_source, iir | rsr); 1795 #endif 1796 1797 return 1; 1798 } 1799 1800 1801 #if defined(KGDB) || defined(SSCOM0CONSOLE) || defined(SSCOM1CONSOLE) 1802 /* 1803 * Initialize UART for use as console or KGDB line. 1804 */ 1805 static int 1806 sscom_init(bus_space_tag_t iot, const struct sscom_uart_info *config, 1807 int rate, int frequency, tcflag_t cflag, bus_space_handle_t *iohp) 1808 { 1809 bus_space_handle_t ioh; 1810 bus_addr_t iobase = config->iobase; 1811 1812 if (bus_space_map(iot, iobase, SSCOM_SIZE, 0, &ioh)) 1813 return ENOMEM; /* ??? */ 1814 1815 bus_space_write_2(iot, ioh, SSCOM_UCON, 0); 1816 bus_space_write_1(iot, ioh, SSCOM_UFCON, 1817 UFCON_TXTRIGGER_8 | UFCON_RXTRIGGER_8 | 1818 UFCON_TXFIFO_RESET | UFCON_RXFIFO_RESET | 1819 UFCON_FIFO_ENABLE ); 1820 /* tx/rx fifo reset are auto-cleared */ 1821 1822 rate = sscomspeed(rate, frequency); 1823 bus_space_write_2(iot, ioh, SSCOM_UBRDIV, rate); 1824 bus_space_write_2(iot, ioh, SSCOM_ULCON, cflag2lcr(cflag)); 1825 1826 /* enable UART */ 1827 bus_space_write_2(iot, ioh, SSCOM_UCON, 1828 UCON_TXMODE_INT|UCON_RXMODE_INT); 1829 bus_space_write_2(iot, ioh, SSCOM_UMCON, UMCON_RTS); 1830 1831 *iohp = ioh; 1832 return 0; 1833 } 1834 1835 #endif 1836 1837 #if defined(SSCOM0CONSOLE) || defined(SSCOM1CONSOLE) 1838 /* 1839 * Following are all routines needed for SSCOM to act as console 1840 */ 1841 struct consdev sscomcons = { 1842 NULL, NULL, sscomcngetc, sscomcnputc, sscomcnpollc, NULL, 1843 NULL, NULL, NODEV, CN_NORMAL 1844 }; 1845 1846 1847 int 1848 sscom_cnattach(bus_space_tag_t iot, const struct sscom_uart_info *config, 1849 int rate, int frequency, tcflag_t cflag) 1850 { 1851 int res; 1852 1853 res = sscom_init(iot, config, rate, frequency, cflag, &sscomconsioh); 1854 if (res) 1855 return res; 1856 1857 cn_tab = &sscomcons; 1858 cn_init_magic(&sscom_cnm_state); 1859 cn_set_magic("\047\001"); /* default magic is BREAK */ 1860 1861 sscomconstag = iot; 1862 sscomconsunit = config->unit; 1863 sscomconsrate = rate; 1864 sscomconscflag = cflag; 1865 1866 return 0; 1867 } 1868 1869 void 1870 sscom_cndetach(void) 1871 { 1872 bus_space_unmap(sscomconstag, sscomconsioh, SSCOM_SIZE); 1873 sscomconstag = NULL; 1874 1875 cn_tab = NULL; 1876 } 1877 1878 /* 1879 * The read-ahead code is so that you can detect pending in-band 1880 * cn_magic in polled mode while doing output rather than having to 1881 * wait until the kernel decides it needs input. 1882 */ 1883 1884 #define MAX_READAHEAD 20 1885 static int sscom_readahead[MAX_READAHEAD]; 1886 static int sscom_readaheadcount = 0; 1887 1888 int 1889 sscomcngetc(dev_t dev) 1890 { 1891 int s = splserial(); 1892 u_char stat, c; 1893 1894 /* got a character from reading things earlier */ 1895 if (sscom_readaheadcount > 0) { 1896 int i; 1897 1898 c = sscom_readahead[0]; 1899 for (i = 1; i < sscom_readaheadcount; i++) { 1900 sscom_readahead[i-1] = sscom_readahead[i]; 1901 } 1902 sscom_readaheadcount--; 1903 splx(s); 1904 return c; 1905 } 1906 1907 /* block until a character becomes available */ 1908 while (!sscom_rxrdy(sscomconstag, sscomconsioh)) 1909 ; 1910 1911 c = sscom_getc(sscomconstag, sscomconsioh); 1912 stat = sscom_geterr(sscomconstag, sscomconsioh); 1913 { 1914 int cn_trapped = 0; /* unused */ 1915 #ifdef DDB 1916 extern int db_active; 1917 if (!db_active) 1918 #endif 1919 cn_check_magic(dev, c, sscom_cnm_state); 1920 } 1921 splx(s); 1922 return c; 1923 } 1924 1925 /* 1926 * Console kernel output character routine. 1927 */ 1928 void 1929 sscomcnputc(dev_t dev, int c) 1930 { 1931 int s = splserial(); 1932 int timo; 1933 1934 int cin, stat; 1935 if (sscom_readaheadcount < MAX_READAHEAD && 1936 sscom_rxrdy(sscomconstag, sscomconsioh)) { 1937 1938 int cn_trapped = 0; 1939 cin = sscom_getc(sscomconstag, sscomconsioh); 1940 stat = sscom_geterr(sscomconstag, sscomconsioh); 1941 cn_check_magic(dev, cin, sscom_cnm_state); 1942 sscom_readahead[sscom_readaheadcount++] = cin; 1943 } 1944 1945 /* wait for any pending transmission to finish */ 1946 timo = 150000; 1947 while (ISSET(bus_space_read_2(sscomconstag, sscomconsioh, SSCOM_UFSTAT), 1948 UFSTAT_TXFULL) && --timo) 1949 continue; 1950 1951 bus_space_write_1(sscomconstag, sscomconsioh, SSCOM_UTXH, c); 1952 SSCOM_BARRIER(sscomconstag, sscomconsioh, BR | BW); 1953 1954 #if 0 1955 /* wait for this transmission to complete */ 1956 timo = 1500000; 1957 while (!ISSET(bus_space_read_1(sscomconstag, sscomconsioh, SSCOM_UTRSTAT), 1958 UTRSTAT_TXEMPTY) && --timo) 1959 continue; 1960 #endif 1961 splx(s); 1962 } 1963 1964 void 1965 sscomcnpollc(dev_t dev, int on) 1966 { 1967 1968 } 1969 1970 #endif /* SSCOM0CONSOLE||SSCOM1CONSOLE */ 1971 1972 #ifdef KGDB 1973 int 1974 sscom_kgdb_attach(bus_space_tag_t iot, const struct sscom_uart_info *config, 1975 int rate, int frequency, tcflag_t cflag) 1976 { 1977 int res; 1978 1979 if (iot == sscomconstag && config->unit == sscomconsunit) { 1980 printf( "console==kgdb_port (%d): kgdb disabled\n", sscomconsunit); 1981 return EBUSY; /* cannot share with console */ 1982 } 1983 1984 res = sscom_init(iot, config, rate, frequency, cflag, &sscom_kgdb_ioh); 1985 if (res) 1986 return res; 1987 1988 kgdb_attach(sscom_kgdb_getc, sscom_kgdb_putc, NULL); 1989 kgdb_dev = 123; /* unneeded, only to satisfy some tests */ 1990 1991 sscom_kgdb_iot = iot; 1992 sscom_kgdb_unit = config->unit; 1993 1994 return 0; 1995 } 1996 1997 /* ARGSUSED */ 1998 int 1999 sscom_kgdb_getc(void *arg) 2000 { 2001 int c, stat; 2002 2003 /* block until a character becomes available */ 2004 while (!sscom_rxrdy(sscom_kgdb_iot, sscom_kgdb_ioh)) 2005 ; 2006 2007 c = sscom_getc(sscom_kgdb_iot, sscom_kgdb_ioh); 2008 stat = sscom_geterr(sscom_kgdb_iot, sscom_kgdb_ioh); 2009 2010 return c; 2011 } 2012 2013 /* ARGSUSED */ 2014 void 2015 sscom_kgdb_putc(void *arg, int c) 2016 { 2017 int timo; 2018 2019 /* wait for any pending transmission to finish */ 2020 timo = 150000; 2021 while (ISSET(bus_space_read_2(sscom_kgdb_iot, sscom_kgdb_ioh, 2022 SSCOM_UFSTAT), UFSTAT_TXFULL) && --timo) 2023 continue; 2024 2025 bus_space_write_1(sscom_kgdb_iot, sscom_kgdb_ioh, SSCOM_UTXH, c); 2026 SSCOM_BARRIER(sscom_kgdb_iot, sscom_kgdb_ioh, BR | BW); 2027 2028 #if 0 2029 /* wait for this transmission to complete */ 2030 timo = 1500000; 2031 while (!ISSET(bus_space_read_1(sscom_kgdb_iot, sscom_kgdb_ioh, 2032 SSCOM_UTRSTAT), UTRSTAT_TXEMPTY) && --timo) 2033 continue; 2034 #endif 2035 } 2036 #endif /* KGDB */ 2037 2038 /* helper function to identify the sscom ports used by 2039 console or KGDB (and not yet autoconf attached) */ 2040 int 2041 sscom_is_console(bus_space_tag_t iot, int unit, 2042 bus_space_handle_t *ioh) 2043 { 2044 bus_space_handle_t help; 2045 2046 if (!sscomconsattached && 2047 iot == sscomconstag && unit == sscomconsunit) 2048 help = sscomconsioh; 2049 #ifdef KGDB 2050 else if (!sscom_kgdb_attached && 2051 iot == sscom_kgdb_iot && unit == sscom_kgdb_unit) 2052 help = sscom_kgdb_ioh; 2053 #endif 2054 else 2055 return 0; 2056 2057 if (ioh) 2058 *ioh = help; 2059 return 1; 2060 } 2061