sscom.c revision 1.9
1 /* $NetBSD: sscom.c,v 1.9 2003/07/31 19:08:10 bsh 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 * 3. All advertising materials mentioning features or use of this software 51 * must display the following acknowledgement: 52 * This product includes software developed by the NetBSD 53 * Foundation, Inc. and its contributors. 54 * 4. Neither the name of The NetBSD Foundation nor the names of its 55 * contributors may be used to endorse or promote products derived 56 * from this software without specific prior written permission. 57 * 58 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 59 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 60 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 61 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 62 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 63 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 64 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 65 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 66 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 67 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 68 * POSSIBILITY OF SUCH DAMAGE. 69 */ 70 71 /* 72 * Copyright (c) 1991 The Regents of the University of California. 73 * All rights reserved. 74 * 75 * Redistribution and use in source and binary forms, with or without 76 * modification, are permitted provided that the following conditions 77 * are met: 78 * 1. Redistributions of source code must retain the above copyright 79 * notice, this list of conditions and the following disclaimer. 80 * 2. Redistributions in binary form must reproduce the above copyright 81 * notice, this list of conditions and the following disclaimer in the 82 * documentation and/or other materials provided with the distribution. 83 * 3. All advertising materials mentioning features or use of this software 84 * must display the following acknowledgement: 85 * This product includes software developed by the University of 86 * California, Berkeley and its contributors. 87 * 4. Neither the name of the University nor the names of its contributors 88 * may be used to endorse or promote products derived from this software 89 * without specific prior written permission. 90 * 91 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 92 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 93 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 94 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 95 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 96 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 97 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 98 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 99 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 100 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 101 * SUCH DAMAGE. 102 * 103 * @(#)com.c 7.5 (Berkeley) 5/16/91 104 */ 105 106 /* 107 * Support integrated UARTs of Samsung S3C2800/2400X/2410X 108 * Derived from sys/dev/ic/com.c 109 */ 110 111 #include <sys/cdefs.h> 112 __KERNEL_RCSID(0, "$NetBSD: sscom.c,v 1.9 2003/07/31 19:08:10 bsh Exp $"); 113 114 #include "opt_sscom.h" 115 #include "opt_ddb.h" 116 #include "opt_kgdb.h" 117 #include "opt_multiprocessor.h" 118 #include "opt_lockdebug.h" 119 120 #include "rnd.h" 121 #if NRND > 0 && defined(RND_COM) 122 #include <sys/rnd.h> 123 #endif 124 125 /* 126 * Override cnmagic(9) macro before including <sys/systm.h>. 127 * We need to know if cn_check_magic triggered debugger, so set a flag. 128 * Callers of cn_check_magic must declare int cn_trapped = 0; 129 * XXX: this is *ugly*! 130 */ 131 #define cn_trap() \ 132 do { \ 133 console_debugger(); \ 134 cn_trapped = 1; \ 135 } while (/* CONSTCOND */ 0) 136 137 #include <sys/param.h> 138 #include <sys/systm.h> 139 #include <sys/ioctl.h> 140 #include <sys/select.h> 141 #include <sys/tty.h> 142 #include <sys/proc.h> 143 #include <sys/user.h> 144 #include <sys/conf.h> 145 #include <sys/file.h> 146 #include <sys/uio.h> 147 #include <sys/kernel.h> 148 #include <sys/syslog.h> 149 #include <sys/types.h> 150 #include <sys/device.h> 151 #include <sys/malloc.h> 152 #include <sys/timepps.h> 153 #include <sys/vnode.h> 154 155 #include <machine/intr.h> 156 #include <machine/bus.h> 157 158 #include <arm/s3c2xx0/s3c2xx0reg.h> 159 #include <arm/s3c2xx0/s3c2xx0var.h> 160 #include <arm/s3c2xx0/sscom_var.h> 161 #include <dev/cons.h> 162 163 dev_type_open(sscomopen); 164 dev_type_close(sscomclose); 165 dev_type_read(sscomread); 166 dev_type_write(sscomwrite); 167 dev_type_ioctl(sscomioctl); 168 dev_type_stop(sscomstop); 169 dev_type_tty(sscomtty); 170 dev_type_poll(sscompoll); 171 172 int sscomcngetc (dev_t); 173 void sscomcnputc (dev_t, int); 174 void sscomcnpollc (dev_t, int); 175 176 #define integrate static inline 177 void sscomsoft (void *); 178 179 integrate void sscom_rxsoft (struct sscom_softc *, struct tty *); 180 integrate void sscom_txsoft (struct sscom_softc *, struct tty *); 181 integrate void sscom_stsoft (struct sscom_softc *, struct tty *); 182 integrate void sscom_schedrx (struct sscom_softc *); 183 static void sscom_modem(struct sscom_softc *, int); 184 static void sscom_break(struct sscom_softc *, int); 185 static void sscom_iflush(struct sscom_softc *); 186 static void sscom_hwiflow(struct sscom_softc *); 187 static void sscom_loadchannelregs(struct sscom_softc *); 188 static void tiocm_to_sscom(struct sscom_softc *, u_long, int); 189 static int sscom_to_tiocm(struct sscom_softc *); 190 static void tiocm_to_sscom(struct sscom_softc *, u_long, int); 191 static int sscom_to_tiocm(struct sscom_softc *); 192 static void sscom_iflush(struct sscom_softc *); 193 194 static int sscomhwiflow(struct tty *tp, int block); 195 static int sscom_init(bus_space_tag_t, const struct sscom_uart_info *, 196 int, int, tcflag_t, bus_space_handle_t *); 197 198 extern struct cfdriver sscom_cd; 199 200 const struct cdevsw sscom_cdevsw = { 201 sscomopen, sscomclose, sscomread, sscomwrite, sscomioctl, 202 sscomstop, sscomtty, sscompoll, nommap, ttykqfilter, D_TTY 203 }; 204 205 /* 206 * Make this an option variable one can patch. 207 * But be warned: this must be a power of 2! 208 */ 209 u_int sscom_rbuf_size = SSCOM_RING_SIZE; 210 211 /* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */ 212 u_int sscom_rbuf_hiwat = (SSCOM_RING_SIZE * 1) / 4; 213 u_int sscom_rbuf_lowat = (SSCOM_RING_SIZE * 3) / 4; 214 215 static int sscomconsunit = -1; 216 static bus_space_tag_t sscomconstag; 217 static bus_space_handle_t sscomconsioh; 218 static int sscomconsattached; 219 static int sscomconsrate; 220 static tcflag_t sscomconscflag; 221 static struct cnm_state sscom_cnm_state; 222 223 #ifdef KGDB 224 #include <sys/kgdb.h> 225 226 static int sscom_kgdb_unit = -1; 227 static bus_space_tag_t sscom_kgdb_iot; 228 static bus_space_handle_t sscom_kgdb_ioh; 229 static int sscom_kgdb_attached; 230 231 int sscom_kgdb_getc (void *); 232 void sscom_kgdb_putc (void *, int); 233 #endif /* KGDB */ 234 235 #define SSCOMUNIT_MASK 0x7f 236 #define SSCOMDIALOUT_MASK 0x80 237 238 #define SSCOMUNIT(x) (minor(x) & SSCOMUNIT_MASK) 239 #define SSCOMDIALOUT(x) (minor(x) & SSCOMDIALOUT_MASK) 240 241 #if 0 242 #define SSCOM_ISALIVE(sc) ((sc)->enabled != 0 && \ 243 ISSET((sc)->sc_dev.dv_flags, DVF_ACTIVE)) 244 #else 245 #define SSCOM_ISALIVE(sc) ISSET((sc)->sc_dev.dv_flags, DVF_ACTIVE) 246 #endif 247 248 #define BR BUS_SPACE_BARRIER_READ 249 #define BW BUS_SPACE_BARRIER_WRITE 250 #define SSCOM_BARRIER(t, h, f) /* no-op */ 251 252 #if (defined(MULTIPROCESSOR) || defined(LOCKDEBUG)) && defined(SSCOM_MPLOCK) 253 254 #define SSCOM_LOCK(sc) simple_lock(&(sc)->sc_lock) 255 #define SSCOM_UNLOCK(sc) simple_unlock(&(sc)->sc_lock) 256 257 #else 258 259 #define SSCOM_LOCK(sc) 260 #define SSCOM_UNLOCK(sc) 261 262 #endif 263 264 #ifndef SSCOM_TOLERANCE 265 #define SSCOM_TOLERANCE 30 /* XXX: baud rate tolerance, in 0.1% units */ 266 #endif 267 268 /* value for UCON */ 269 #define UCON_RXINT_MASK \ 270 (UCON_RXMODE_MASK|UCON_ERRINT|UCON_TOINT|UCON_RXINT_TYPE) 271 #define UCON_RXINT_ENABLE \ 272 (UCON_RXMODE_INT|UCON_ERRINT|UCON_TOINT|UCON_RXINT_TYPE_LEVEL) 273 #define UCON_TXINT_MASK (UCON_TXMODE_MASK|UCON_TXINT_TYPE) 274 #define UCON_TXINT_ENABLE (UCON_TXMODE_INT|UCON_TXINT_TYPE_LEVEL) 275 276 /* we don't want tx interrupt on debug port, but it is needed to 277 have transmitter active */ 278 #define UCON_DEBUGPORT (UCON_RXINT_ENABLE|UCON_TXINT_ENABLE) 279 280 281 static __inline void 282 __sscom_output_chunk(struct sscom_softc *sc, int ufstat) 283 { 284 int n, space; 285 bus_space_tag_t iot = sc->sc_iot; 286 bus_space_handle_t ioh = sc->sc_ioh; 287 288 n = sc->sc_tbc; 289 space = 16 - ((ufstat & UFSTAT_TXCOUNT) >> UFSTAT_TXCOUNT_SHIFT); 290 291 if (n > space) 292 n = space; 293 294 if (n > 0) { 295 bus_space_write_multi_1(iot, ioh, SSCOM_UTXH, sc->sc_tba, n); 296 sc->sc_tbc -= n; 297 sc->sc_tba += n; 298 } 299 } 300 301 static void 302 sscom_output_chunk(struct sscom_softc *sc) 303 { 304 int ufstat = bus_space_read_2(sc->sc_iot, sc->sc_ioh, SSCOM_UFSTAT); 305 306 if (!(ufstat & UFSTAT_TXFULL)) 307 __sscom_output_chunk(sc, ufstat); 308 } 309 310 int 311 sscomspeed(long speed, long frequency) 312 { 313 #define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */ 314 315 int x, err; 316 317 if (speed <= 0) 318 return -1; 319 x = divrnd(frequency / 16, speed); 320 if (x <= 0) 321 return -1; 322 err = divrnd(((quad_t)frequency) * 1000 / 16, speed * x) - 1000; 323 if (err < 0) 324 err = -err; 325 if (err > SSCOM_TOLERANCE) 326 return -1; 327 return x-1; 328 329 #undef divrnd 330 } 331 332 void sscomstatus (struct sscom_softc *, char *); 333 334 #ifdef SSCOM_DEBUG 335 int sscom_debug = 0; 336 337 void 338 sscomstatus(struct sscom_softc *sc, char *str) 339 { 340 struct tty *tp = sc->sc_tty; 341 int umstat = bus_space_read_1(sc->sc_iot, sc->sc_iot, SSCOM_UMSTAT); 342 int umcon = bus_space_read_1(sc->sc_iot, sc->sc_iot, SSCOM_UMCON); 343 344 printf("%s: %s %sclocal %sdcd %sts_carr_on %sdtr %stx_stopped\n", 345 sc->sc_dev.dv_xname, str, 346 ISSET(tp->t_cflag, CLOCAL) ? "+" : "-", 347 "+", /* DCD */ 348 ISSET(tp->t_state, TS_CARR_ON) ? "+" : "-", 349 "+", /* DTR */ 350 sc->sc_tx_stopped ? "+" : "-"); 351 352 printf("%s: %s %scrtscts %scts %sts_ttstop %srts %xrx_flags\n", 353 sc->sc_dev.dv_xname, str, 354 ISSET(tp->t_cflag, CRTSCTS) ? "+" : "-", 355 ISSET(umstat, UMSTAT_CTS) ? "+" : "-", 356 ISSET(tp->t_state, TS_TTSTOP) ? "+" : "-", 357 ISSET(umcon, UMCON_RTS) ? "+" : "-", 358 sc->sc_rx_flags); 359 } 360 #else 361 #define sscom_debug 0 362 #endif 363 364 static void 365 sscom_enable_debugport(struct sscom_softc *sc) 366 { 367 int s; 368 369 /* Turn on line break interrupt, set carrier. */ 370 s = splserial(); 371 SSCOM_LOCK(sc); 372 sc->sc_ucon = UCON_DEBUGPORT; 373 bus_space_write_2(sc->sc_iot, sc->sc_ioh, SSCOM_UCON, sc->sc_ucon); 374 sc->sc_umcon = UMCON_RTS|UMCON_DTR; 375 sc->set_modem_control(sc); 376 sscom_enable_rxint(sc); 377 sscom_disable_txint(sc); 378 SSCOM_UNLOCK(sc); 379 splx(s); 380 } 381 382 static void 383 sscom_set_modem_control(struct sscom_softc *sc) 384 { 385 /* flob RTS */ 386 bus_space_write_1(sc->sc_iot, sc->sc_ioh, 387 SSCOM_UMCON, sc->sc_umcon & UMCON_HW_MASK); 388 /* ignore DTR */ 389 } 390 391 static int 392 sscom_read_modem_status(struct sscom_softc *sc) 393 { 394 int msts; 395 396 msts = bus_space_read_1(sc->sc_iot, sc->sc_ioh, SSCOM_UMSTAT); 397 398 /* DCD and DSR are always on */ 399 return (msts & UMSTAT_CTS) | MSTS_DCD | MSTS_DSR; 400 } 401 402 void 403 sscom_attach_subr(struct sscom_softc *sc) 404 { 405 int unit = sc->sc_unit; 406 bus_space_tag_t iot = sc->sc_iot; 407 bus_space_handle_t ioh = sc->sc_ioh; 408 struct tty *tp; 409 410 callout_init(&sc->sc_diag_callout); 411 #if (defined(MULTIPROCESSOR) || defined(LOCKDEBUG)) && defined(SSCOM_MPLOCK) 412 simple_lock_init(&sc->sc_lock); 413 #endif 414 415 sc->sc_ucon = UCON_RXINT_ENABLE|UCON_TXINT_ENABLE; 416 417 /* 418 * set default for modem control hook 419 */ 420 if (sc->set_modem_control == NULL) 421 sc->set_modem_control = sscom_set_modem_control; 422 if (sc->read_modem_status == NULL) 423 sc->read_modem_status = sscom_read_modem_status; 424 425 /* Disable interrupts before configuring the device. */ 426 sscom_disable_txrxint(sc); 427 428 #ifdef KGDB 429 /* 430 * Allow kgdb to "take over" this port. If this is 431 * the kgdb device, it has exclusive use. 432 */ 433 if (unit == sscom_kgdb_unit) { 434 SET(sc->sc_hwflags, SSCOM_HW_KGDB); 435 sc->sc_ucon = UCON_DEBUGPORT; 436 } 437 #endif 438 439 if (unit == sscomconsunit) { 440 sscomconsattached = 1; 441 442 sscomconstag = iot; 443 sscomconsioh = ioh; 444 445 /* Make sure the console is always "hardwired". */ 446 delay(1000); /* XXX: wait for output to finish */ 447 SET(sc->sc_hwflags, SSCOM_HW_CONSOLE); 448 SET(sc->sc_swflags, TIOCFLAG_SOFTCAR); 449 450 sc->sc_ucon = UCON_DEBUGPORT; 451 } 452 453 bus_space_write_1(iot, ioh, SSCOM_UFCON, 454 UFCON_TXTRIGGER_8|UFCON_RXTRIGGER_8|UFCON_FIFO_ENABLE| 455 UFCON_TXFIFO_RESET|UFCON_RXFIFO_RESET); 456 457 bus_space_write_1(iot, ioh, SSCOM_UCON, sc->sc_ucon); 458 459 #ifdef KGDB 460 if (ISSET(sc->sc_hwflags, SSCOM_HW_KGDB)) { 461 sscom_kgdb_attached = 1; 462 printf("%s: kgdb\n", sc->sc_dev.dv_xname); 463 sscom_enable_debugport(sc); 464 return; 465 } 466 #endif 467 468 469 470 tp = ttymalloc(); 471 tp->t_oproc = sscomstart; 472 tp->t_param = sscomparam; 473 tp->t_hwiflow = sscomhwiflow; 474 475 sc->sc_tty = tp; 476 sc->sc_rbuf = malloc(sscom_rbuf_size << 1, M_DEVBUF, M_NOWAIT); 477 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 478 sc->sc_rbavail = sscom_rbuf_size; 479 if (sc->sc_rbuf == NULL) { 480 printf("%s: unable to allocate ring buffer\n", 481 sc->sc_dev.dv_xname); 482 return; 483 } 484 sc->sc_ebuf = sc->sc_rbuf + (sscom_rbuf_size << 1); 485 486 tty_attach(tp); 487 488 if (ISSET(sc->sc_hwflags, SSCOM_HW_CONSOLE)) { 489 int maj; 490 491 /* locate the major number */ 492 maj = cdevsw_lookup_major(&sscom_cdevsw); 493 494 cn_tab->cn_dev = makedev(maj, sc->sc_dev.dv_unit); 495 496 printf("%s: console (major=%d)\n", sc->sc_dev.dv_xname, maj); 497 } 498 499 500 sc->sc_si = softintr_establish(IPL_SOFTSERIAL, sscomsoft, sc); 501 502 #if NRND > 0 && defined(RND_COM) 503 rnd_attach_source(&sc->rnd_source, sc->sc_dev.dv_xname, 504 RND_TYPE_TTY, 0); 505 #endif 506 507 /* if there are no enable/disable functions, assume the device 508 is always enabled */ 509 510 if (ISSET(sc->sc_hwflags, SSCOM_HW_CONSOLE)) 511 sscom_enable_debugport(sc); 512 else 513 sscom_disable_txrxint(sc); 514 515 SET(sc->sc_hwflags, SSCOM_HW_DEV_OK); 516 } 517 518 int 519 sscom_detach(struct device *self, int flags) 520 { 521 return 0; 522 } 523 524 int 525 sscom_activate(struct device *self, enum devact act) 526 { 527 #ifdef notyet 528 struct sscom_softc *sc = (struct sscom_softc *)self; 529 int s, rv = 0; 530 531 s = splserial(); 532 SSCOM_LOCK(sc); 533 switch (act) { 534 case DVACT_ACTIVATE: 535 rv = EOPNOTSUPP; 536 break; 537 538 case DVACT_DEACTIVATE: 539 if (sc->sc_hwflags & (SSCOM_HW_CONSOLE|SSCOM_HW_KGDB)) { 540 rv = EBUSY; 541 break; 542 } 543 544 sc->enabled = 0; 545 break; 546 } 547 548 SSCOM_UNLOCK(sc); 549 splx(s); 550 return rv; 551 #else 552 return 0; 553 #endif 554 } 555 556 void 557 sscom_shutdown(struct sscom_softc *sc) 558 { 559 #ifdef notyet 560 struct tty *tp = sc->sc_tty; 561 int s; 562 563 s = splserial(); 564 SSCOM_LOCK(sc); 565 566 /* If we were asserting flow control, then deassert it. */ 567 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 568 sscom_hwiflow(sc); 569 570 /* Clear any break condition set with TIOCSBRK. */ 571 sscom_break(sc, 0); 572 573 /* 574 * Hang up if necessary. Wait a bit, so the other side has time to 575 * notice even if we immediately open the port again. 576 * Avoid tsleeping above splhigh(). 577 */ 578 if (ISSET(tp->t_cflag, HUPCL)) { 579 sscom_modem(sc, 0); 580 SSCOM_UNLOCK(sc); 581 splx(s); 582 /* XXX tsleep will only timeout */ 583 (void) tsleep(sc, TTIPRI, ttclos, hz); 584 s = splserial(); 585 SSCOM_LOCK(sc); 586 } 587 588 if (ISSET(sc->sc_hwflags, SSCOM_HW_CONSOLE)) 589 /* interrupt on break */ 590 sc->sc_ucon = UCON_DEBUGPORT; 591 else 592 sc->sc_ucon = 0; 593 bus_space_write_2(sc->sc_iot, sc->sc_ioh, SSCOM_UCON, sc->sc_ucon); 594 595 #ifdef DIAGNOSTIC 596 if (!sc->enabled) 597 panic("sscom_shutdown: not enabled?"); 598 #endif 599 sc->enabled = 0; 600 SSCOM_UNLOCK(sc); 601 splx(s); 602 #endif 603 } 604 605 int 606 sscomopen(dev_t dev, int flag, int mode, struct proc *p) 607 { 608 struct sscom_softc *sc; 609 struct tty *tp; 610 int s, s2; 611 int error; 612 613 sc = device_lookup(&sscom_cd, SSCOMUNIT(dev)); 614 if (sc == NULL || !ISSET(sc->sc_hwflags, SSCOM_HW_DEV_OK) || 615 sc->sc_rbuf == NULL) 616 return ENXIO; 617 618 if (ISSET(sc->sc_dev.dv_flags, DVF_ACTIVE) == 0) 619 return ENXIO; 620 621 #ifdef KGDB 622 /* 623 * If this is the kgdb port, no other use is permitted. 624 */ 625 if (ISSET(sc->sc_hwflags, SSCOM_HW_KGDB)) 626 return EBUSY; 627 #endif 628 629 tp = sc->sc_tty; 630 631 if (ISSET(tp->t_state, TS_ISOPEN) && 632 ISSET(tp->t_state, TS_XCLUDE) && 633 p->p_ucred->cr_uid != 0) 634 return EBUSY; 635 636 s = spltty(); 637 638 /* 639 * Do the following iff this is a first open. 640 */ 641 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 642 struct termios t; 643 644 tp->t_dev = dev; 645 646 s2 = splserial(); 647 SSCOM_LOCK(sc); 648 649 /* Turn on interrupts. */ 650 sscom_enable_txrxint(sc); 651 652 /* Fetch the current modem control status, needed later. */ 653 sc->sc_msts = sc->read_modem_status(sc); 654 655 #if 0 656 /* Clear PPS capture state on first open. */ 657 sc->sc_ppsmask = 0; 658 sc->ppsparam.mode = 0; 659 #endif 660 661 SSCOM_UNLOCK(sc); 662 splx(s2); 663 664 /* 665 * Initialize the termios status to the defaults. Add in the 666 * sticky bits from TIOCSFLAGS. 667 */ 668 t.c_ispeed = 0; 669 if (ISSET(sc->sc_hwflags, SSCOM_HW_CONSOLE)) { 670 t.c_ospeed = sscomconsrate; 671 t.c_cflag = sscomconscflag; 672 } else { 673 t.c_ospeed = TTYDEF_SPEED; 674 t.c_cflag = TTYDEF_CFLAG; 675 } 676 if (ISSET(sc->sc_swflags, TIOCFLAG_CLOCAL)) 677 SET(t.c_cflag, CLOCAL); 678 if (ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS)) 679 SET(t.c_cflag, CRTSCTS); 680 if (ISSET(sc->sc_swflags, TIOCFLAG_MDMBUF)) 681 SET(t.c_cflag, MDMBUF); 682 /* Make sure sscomparam() will do something. */ 683 tp->t_ospeed = 0; 684 (void) sscomparam(tp, &t); 685 tp->t_iflag = TTYDEF_IFLAG; 686 tp->t_oflag = TTYDEF_OFLAG; 687 tp->t_lflag = TTYDEF_LFLAG; 688 ttychars(tp); 689 ttsetwater(tp); 690 691 s2 = splserial(); 692 SSCOM_LOCK(sc); 693 694 /* 695 * Turn on DTR. We must always do this, even if carrier is not 696 * present, because otherwise we'd have to use TIOCSDTR 697 * immediately after setting CLOCAL, which applications do not 698 * expect. We always assert DTR while the device is open 699 * unless explicitly requested to deassert it. 700 */ 701 sscom_modem(sc, 1); 702 703 /* Clear the input ring, and unblock. */ 704 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 705 sc->sc_rbavail = sscom_rbuf_size; 706 sscom_iflush(sc); 707 CLR(sc->sc_rx_flags, RX_ANY_BLOCK); 708 sscom_hwiflow(sc); 709 710 if (sscom_debug) 711 sscomstatus(sc, "sscomopen "); 712 713 SSCOM_UNLOCK(sc); 714 splx(s2); 715 } 716 717 splx(s); 718 719 error = ttyopen(tp, SSCOMDIALOUT(dev), ISSET(flag, O_NONBLOCK)); 720 if (error) 721 goto bad; 722 723 error = (*tp->t_linesw->l_open)(dev, tp); 724 if (error) 725 goto bad; 726 727 return 0; 728 729 bad: 730 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 731 /* 732 * We failed to open the device, and nobody else had it opened. 733 * Clean up the state as appropriate. 734 */ 735 sscom_shutdown(sc); 736 } 737 738 return error; 739 } 740 741 int 742 sscomclose(dev_t dev, int flag, int mode, struct proc *p) 743 { 744 struct sscom_softc *sc = device_lookup(&sscom_cd, SSCOMUNIT(dev)); 745 struct tty *tp = sc->sc_tty; 746 747 /* XXX This is for cons.c. */ 748 if (!ISSET(tp->t_state, TS_ISOPEN)) 749 return 0; 750 751 (*tp->t_linesw->l_close)(tp, flag); 752 ttyclose(tp); 753 754 if (SSCOM_ISALIVE(sc) == 0) 755 return 0; 756 757 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 758 /* 759 * Although we got a last close, the device may still be in 760 * use; e.g. if this was the dialout node, and there are still 761 * processes waiting for carrier on the non-dialout node. 762 */ 763 sscom_shutdown(sc); 764 } 765 766 return 0; 767 } 768 769 int 770 sscomread(dev_t dev, struct uio *uio, int flag) 771 { 772 struct sscom_softc *sc = device_lookup(&sscom_cd, SSCOMUNIT(dev)); 773 struct tty *tp = sc->sc_tty; 774 775 if (SSCOM_ISALIVE(sc) == 0) 776 return EIO; 777 778 return (*tp->t_linesw->l_read)(tp, uio, flag); 779 } 780 781 int 782 sscomwrite(dev_t dev, struct uio *uio, int flag) 783 { 784 struct sscom_softc *sc = device_lookup(&sscom_cd, SSCOMUNIT(dev)); 785 struct tty *tp = sc->sc_tty; 786 787 if (SSCOM_ISALIVE(sc) == 0) 788 return EIO; 789 790 return (*tp->t_linesw->l_write)(tp, uio, flag); 791 } 792 793 int 794 sscompoll(dev_t dev, int events, struct proc *p) 795 { 796 struct sscom_softc *sc = device_lookup(&sscom_cd, SSCOMUNIT(dev)); 797 struct tty *tp = sc->sc_tty; 798 799 if (SSCOM_ISALIVE(sc) == 0) 800 return EIO; 801 802 return (*tp->t_linesw->l_poll)(tp, events, p); 803 } 804 805 struct tty * 806 sscomtty(dev_t dev) 807 { 808 struct sscom_softc *sc = device_lookup(&sscom_cd, SSCOMUNIT(dev)); 809 struct tty *tp = sc->sc_tty; 810 811 return tp; 812 } 813 814 int 815 sscomioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p) 816 { 817 struct sscom_softc *sc = device_lookup(&sscom_cd, SSCOMUNIT(dev)); 818 struct tty *tp = sc->sc_tty; 819 int error; 820 int s; 821 822 if (SSCOM_ISALIVE(sc) == 0) 823 return EIO; 824 825 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, p); 826 if (error != EPASSTHROUGH) 827 return error; 828 829 error = ttioctl(tp, cmd, data, flag, p); 830 if (error != EPASSTHROUGH) 831 return error; 832 833 error = 0; 834 835 s = splserial(); 836 SSCOM_LOCK(sc); 837 838 switch (cmd) { 839 case TIOCSBRK: 840 sscom_break(sc, 1); 841 break; 842 843 case TIOCCBRK: 844 sscom_break(sc, 0); 845 break; 846 847 case TIOCSDTR: 848 sscom_modem(sc, 1); 849 break; 850 851 case TIOCCDTR: 852 sscom_modem(sc, 0); 853 break; 854 855 case TIOCGFLAGS: 856 *(int *)data = sc->sc_swflags; 857 break; 858 859 case TIOCSFLAGS: 860 error = suser(p->p_ucred, &p->p_acflag); 861 if (error) 862 break; 863 sc->sc_swflags = *(int *)data; 864 break; 865 866 case TIOCMSET: 867 case TIOCMBIS: 868 case TIOCMBIC: 869 tiocm_to_sscom(sc, cmd, *(int *)data); 870 break; 871 872 case TIOCMGET: 873 *(int *)data = sscom_to_tiocm(sc); 874 break; 875 876 default: 877 error = EPASSTHROUGH; 878 break; 879 } 880 881 SSCOM_UNLOCK(sc); 882 splx(s); 883 884 if (sscom_debug) 885 sscomstatus(sc, "sscomioctl "); 886 887 return error; 888 } 889 890 integrate void 891 sscom_schedrx(struct sscom_softc *sc) 892 { 893 894 sc->sc_rx_ready = 1; 895 896 /* Wake up the poller. */ 897 softintr_schedule(sc->sc_si); 898 } 899 900 static void 901 sscom_break(struct sscom_softc *sc, int onoff) 902 { 903 904 if (onoff) 905 SET(sc->sc_ucon, UCON_SBREAK); 906 else 907 CLR(sc->sc_ucon, UCON_SBREAK); 908 909 if (!sc->sc_heldchange) { 910 if (sc->sc_tx_busy) { 911 sc->sc_heldtbc = sc->sc_tbc; 912 sc->sc_tbc = 0; 913 sc->sc_heldchange = 1; 914 } else 915 sscom_loadchannelregs(sc); 916 } 917 } 918 919 static void 920 sscom_modem(struct sscom_softc *sc, int onoff) 921 { 922 if (onoff) 923 SET(sc->sc_umcon, UMCON_DTR); 924 else 925 CLR(sc->sc_umcon, UMCON_DTR); 926 927 if (!sc->sc_heldchange) { 928 if (sc->sc_tx_busy) { 929 sc->sc_heldtbc = sc->sc_tbc; 930 sc->sc_tbc = 0; 931 sc->sc_heldchange = 1; 932 } else 933 sscom_loadchannelregs(sc); 934 } 935 } 936 937 static void 938 tiocm_to_sscom(struct sscom_softc *sc, u_long how, int ttybits) 939 { 940 u_char sscombits; 941 942 sscombits = 0; 943 if (ISSET(ttybits, TIOCM_DTR)) 944 sscombits = UMCON_DTR; 945 if (ISSET(ttybits, TIOCM_RTS)) 946 SET(sscombits, UMCON_RTS); 947 948 switch (how) { 949 case TIOCMBIC: 950 CLR(sc->sc_umcon, sscombits); 951 break; 952 953 case TIOCMBIS: 954 SET(sc->sc_umcon, sscombits); 955 break; 956 957 case TIOCMSET: 958 CLR(sc->sc_umcon, UMCON_DTR); 959 SET(sc->sc_umcon, sscombits); 960 break; 961 } 962 963 if (!sc->sc_heldchange) { 964 if (sc->sc_tx_busy) { 965 sc->sc_heldtbc = sc->sc_tbc; 966 sc->sc_tbc = 0; 967 sc->sc_heldchange = 1; 968 } else 969 sscom_loadchannelregs(sc); 970 } 971 } 972 973 static int 974 sscom_to_tiocm(struct sscom_softc *sc) 975 { 976 u_char sscombits; 977 int ttybits = 0; 978 979 sscombits = sc->sc_umcon; 980 #if 0 981 if (ISSET(sscombits, MCR_DTR)) 982 SET(ttybits, TIOCM_DTR); 983 #endif 984 if (ISSET(sscombits, UMCON_RTS)) 985 SET(ttybits, TIOCM_RTS); 986 987 sscombits = sc->sc_msts; 988 if (ISSET(sscombits, MSTS_DCD)) 989 SET(ttybits, TIOCM_CD); 990 if (ISSET(sscombits, MSTS_DSR)) 991 SET(ttybits, TIOCM_DSR); 992 if (ISSET(sscombits, MSTS_CTS)) 993 SET(ttybits, TIOCM_CTS); 994 995 if (sc->sc_ucon != 0) 996 SET(ttybits, TIOCM_LE); 997 998 return ttybits; 999 } 1000 1001 static int 1002 cflag2lcr(tcflag_t cflag) 1003 { 1004 u_char lcr = ULCON_PARITY_NONE; 1005 1006 switch (cflag & (PARENB|PARODD)) { 1007 case PARENB|PARODD: lcr = ULCON_PARITY_ODD; break; 1008 case PARENB: lcr = ULCON_PARITY_EVEN; 1009 } 1010 1011 switch (ISSET(cflag, CSIZE)) { 1012 case CS5: 1013 SET(lcr, ULCON_LENGTH_5); 1014 break; 1015 case CS6: 1016 SET(lcr, ULCON_LENGTH_6); 1017 break; 1018 case CS7: 1019 SET(lcr, ULCON_LENGTH_7); 1020 break; 1021 case CS8: 1022 SET(lcr, ULCON_LENGTH_8); 1023 break; 1024 } 1025 if (ISSET(cflag, CSTOPB)) 1026 SET(lcr, ULCON_STOP); 1027 1028 return lcr; 1029 } 1030 1031 int 1032 sscomparam(struct tty *tp, struct termios *t) 1033 { 1034 struct sscom_softc *sc = device_lookup(&sscom_cd, SSCOMUNIT(tp->t_dev)); 1035 int ospeed; 1036 u_char lcr; 1037 int s; 1038 1039 if (SSCOM_ISALIVE(sc) == 0) 1040 return EIO; 1041 1042 ospeed = sscomspeed(t->c_ospeed, sc->sc_frequency); 1043 1044 /* Check requested parameters. */ 1045 if (ospeed < 0) 1046 return EINVAL; 1047 if (t->c_ispeed && t->c_ispeed != t->c_ospeed) 1048 return EINVAL; 1049 1050 /* 1051 * For the console, always force CLOCAL and !HUPCL, so that the port 1052 * is always active. 1053 */ 1054 if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) || 1055 ISSET(sc->sc_hwflags, SSCOM_HW_CONSOLE)) { 1056 SET(t->c_cflag, CLOCAL); 1057 CLR(t->c_cflag, HUPCL); 1058 } 1059 1060 /* 1061 * If there were no changes, don't do anything. This avoids dropping 1062 * input and improves performance when all we did was frob things like 1063 * VMIN and VTIME. 1064 */ 1065 if (tp->t_ospeed == t->c_ospeed && 1066 tp->t_cflag == t->c_cflag) 1067 return 0; 1068 1069 lcr = cflag2lcr(t->c_cflag); 1070 1071 s = splserial(); 1072 SSCOM_LOCK(sc); 1073 1074 sc->sc_ulcon = lcr; 1075 1076 /* 1077 * If we're not in a mode that assumes a connection is present, then 1078 * ignore carrier changes. 1079 */ 1080 if (ISSET(t->c_cflag, CLOCAL | MDMBUF)) 1081 sc->sc_msr_dcd = 0; 1082 else 1083 sc->sc_msr_dcd = MSTS_DCD; 1084 1085 /* 1086 * Set the flow control pins depending on the current flow control 1087 * mode. 1088 */ 1089 if (ISSET(t->c_cflag, CRTSCTS)) { 1090 sc->sc_mcr_dtr = UMCON_DTR; 1091 sc->sc_mcr_rts = UMCON_RTS; 1092 sc->sc_msr_cts = MSTS_CTS; 1093 } 1094 else if (ISSET(t->c_cflag, MDMBUF)) { 1095 /* 1096 * For DTR/DCD flow control, make sure we don't toggle DTR for 1097 * carrier detection. 1098 */ 1099 sc->sc_mcr_dtr = 0; 1100 sc->sc_mcr_rts = UMCON_DTR; 1101 sc->sc_msr_cts = MSTS_DCD; 1102 } 1103 else { 1104 /* 1105 * If no flow control, then always set RTS. This will make 1106 * the other side happy if it mistakenly thinks we're doing 1107 * RTS/CTS flow control. 1108 */ 1109 sc->sc_mcr_dtr = UMCON_DTR | UMCON_RTS; 1110 sc->sc_mcr_rts = 0; 1111 sc->sc_msr_cts = 0; 1112 if (ISSET(sc->sc_umcon, UMCON_DTR)) 1113 SET(sc->sc_umcon, UMCON_RTS); 1114 else 1115 CLR(sc->sc_umcon, UMCON_RTS); 1116 } 1117 sc->sc_msr_mask = sc->sc_msr_cts | sc->sc_msr_dcd; 1118 1119 if (ospeed == 0) 1120 CLR(sc->sc_umcon, sc->sc_mcr_dtr); 1121 else 1122 SET(sc->sc_umcon, sc->sc_mcr_dtr); 1123 1124 sc->sc_ubrdiv = ospeed; 1125 1126 /* And copy to tty. */ 1127 tp->t_ispeed = 0; 1128 tp->t_ospeed = t->c_ospeed; 1129 tp->t_cflag = t->c_cflag; 1130 1131 if (!sc->sc_heldchange) { 1132 if (sc->sc_tx_busy) { 1133 sc->sc_heldtbc = sc->sc_tbc; 1134 sc->sc_tbc = 0; 1135 sc->sc_heldchange = 1; 1136 } else 1137 sscom_loadchannelregs(sc); 1138 } 1139 1140 if (!ISSET(t->c_cflag, CHWFLOW)) { 1141 /* Disable the high water mark. */ 1142 sc->sc_r_hiwat = 0; 1143 sc->sc_r_lowat = 0; 1144 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1145 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1146 sscom_schedrx(sc); 1147 } 1148 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 1149 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 1150 sscom_hwiflow(sc); 1151 } 1152 } else { 1153 sc->sc_r_hiwat = sscom_rbuf_hiwat; 1154 sc->sc_r_lowat = sscom_rbuf_lowat; 1155 } 1156 1157 SSCOM_UNLOCK(sc); 1158 splx(s); 1159 1160 /* 1161 * Update the tty layer's idea of the carrier bit, in case we changed 1162 * CLOCAL or MDMBUF. We don't hang up here; we only do that by 1163 * explicit request. 1164 */ 1165 (void) (*tp->t_linesw->l_modem)(tp, ISSET(sc->sc_msts, MSTS_DCD)); 1166 1167 if (sscom_debug) 1168 sscomstatus(sc, "sscomparam "); 1169 1170 if (!ISSET(t->c_cflag, CHWFLOW)) { 1171 if (sc->sc_tx_stopped) { 1172 sc->sc_tx_stopped = 0; 1173 sscomstart(tp); 1174 } 1175 } 1176 1177 return 0; 1178 } 1179 1180 static void 1181 sscom_iflush(struct sscom_softc *sc) 1182 { 1183 bus_space_tag_t iot = sc->sc_iot; 1184 bus_space_handle_t ioh = sc->sc_ioh; 1185 int timo; 1186 1187 1188 timo = 50000; 1189 /* flush any pending I/O */ 1190 while ( sscom_rxrdy(iot, ioh) && --timo) 1191 (void)sscom_getc(iot,ioh); 1192 #ifdef DIAGNOSTIC 1193 if (!timo) 1194 printf("%s: sscom_iflush timeout\n", sc->sc_dev.dv_xname); 1195 #endif 1196 } 1197 1198 static void 1199 sscom_loadchannelregs(struct sscom_softc *sc) 1200 { 1201 bus_space_tag_t iot = sc->sc_iot; 1202 bus_space_handle_t ioh = sc->sc_ioh; 1203 1204 /* XXXXX necessary? */ 1205 sscom_iflush(sc); 1206 1207 bus_space_write_2(iot, ioh, SSCOM_UCON, 0); 1208 1209 #if 0 1210 if (ISSET(sc->sc_hwflags, COM_HW_FLOW)) { 1211 bus_space_write_1(iot, ioh, com_lcr, LCR_EERS); 1212 bus_space_write_1(iot, ioh, com_efr, sc->sc_efr); 1213 } 1214 #endif 1215 1216 bus_space_write_2(iot, ioh, SSCOM_UBRDIV, sc->sc_ubrdiv); 1217 bus_space_write_1(iot, ioh, SSCOM_ULCON, sc->sc_ulcon); 1218 sc->set_modem_control(sc); 1219 bus_space_write_2(iot, ioh, SSCOM_UCON, sc->sc_ucon); 1220 } 1221 1222 static int 1223 sscomhwiflow(struct tty *tp, int block) 1224 { 1225 struct sscom_softc *sc = device_lookup(&sscom_cd, SSCOMUNIT(tp->t_dev)); 1226 int s; 1227 1228 if (SSCOM_ISALIVE(sc) == 0) 1229 return 0; 1230 1231 if (sc->sc_mcr_rts == 0) 1232 return 0; 1233 1234 s = splserial(); 1235 SSCOM_LOCK(sc); 1236 1237 if (block) { 1238 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1239 SET(sc->sc_rx_flags, RX_TTY_BLOCKED); 1240 sscom_hwiflow(sc); 1241 } 1242 } else { 1243 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1244 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1245 sscom_schedrx(sc); 1246 } 1247 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1248 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED); 1249 sscom_hwiflow(sc); 1250 } 1251 } 1252 1253 SSCOM_UNLOCK(sc); 1254 splx(s); 1255 return 1; 1256 } 1257 1258 /* 1259 * (un)block input via hw flowcontrol 1260 */ 1261 static void 1262 sscom_hwiflow(struct sscom_softc *sc) 1263 { 1264 if (sc->sc_mcr_rts == 0) 1265 return; 1266 1267 if (ISSET(sc->sc_rx_flags, RX_ANY_BLOCK)) { 1268 CLR(sc->sc_umcon, sc->sc_mcr_rts); 1269 CLR(sc->sc_mcr_active, sc->sc_mcr_rts); 1270 } else { 1271 SET(sc->sc_umcon, sc->sc_mcr_rts); 1272 SET(sc->sc_mcr_active, sc->sc_mcr_rts); 1273 } 1274 sc->set_modem_control(sc); 1275 } 1276 1277 1278 void 1279 sscomstart(struct tty *tp) 1280 { 1281 struct sscom_softc *sc = device_lookup(&sscom_cd, SSCOMUNIT(tp->t_dev)); 1282 int s; 1283 1284 if (SSCOM_ISALIVE(sc) == 0) 1285 return; 1286 1287 s = spltty(); 1288 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 1289 goto out; 1290 if (sc->sc_tx_stopped) 1291 goto out; 1292 1293 if (tp->t_outq.c_cc <= tp->t_lowat) { 1294 if (ISSET(tp->t_state, TS_ASLEEP)) { 1295 CLR(tp->t_state, TS_ASLEEP); 1296 wakeup(&tp->t_outq); 1297 } 1298 selwakeup(&tp->t_wsel); 1299 if (tp->t_outq.c_cc == 0) 1300 goto out; 1301 } 1302 1303 /* Grab the first contiguous region of buffer space. */ 1304 { 1305 u_char *tba; 1306 int tbc; 1307 1308 tba = tp->t_outq.c_cf; 1309 tbc = ndqb(&tp->t_outq, 0); 1310 1311 (void)splserial(); 1312 SSCOM_LOCK(sc); 1313 1314 sc->sc_tba = tba; 1315 sc->sc_tbc = tbc; 1316 } 1317 1318 SET(tp->t_state, TS_BUSY); 1319 sc->sc_tx_busy = 1; 1320 1321 /* Output the first chunk of the contiguous buffer. */ 1322 sscom_output_chunk(sc); 1323 1324 /* Enable transmit completion interrupts if necessary. */ 1325 if ((sc->sc_hwflags & SSCOM_HW_TXINT) == 0) 1326 sscom_enable_txint(sc); 1327 1328 SSCOM_UNLOCK(sc); 1329 out: 1330 splx(s); 1331 return; 1332 } 1333 1334 /* 1335 * Stop output on a line. 1336 */ 1337 void 1338 sscomstop(struct tty *tp, int flag) 1339 { 1340 struct sscom_softc *sc = device_lookup(&sscom_cd, SSCOMUNIT(tp->t_dev)); 1341 int s; 1342 1343 s = splserial(); 1344 SSCOM_LOCK(sc); 1345 if (ISSET(tp->t_state, TS_BUSY)) { 1346 /* Stop transmitting at the next chunk. */ 1347 sc->sc_tbc = 0; 1348 sc->sc_heldtbc = 0; 1349 if (!ISSET(tp->t_state, TS_TTSTOP)) 1350 SET(tp->t_state, TS_FLUSH); 1351 } 1352 SSCOM_UNLOCK(sc); 1353 splx(s); 1354 } 1355 1356 void 1357 sscomdiag(void *arg) 1358 { 1359 struct sscom_softc *sc = arg; 1360 int overflows, floods; 1361 int s; 1362 1363 s = splserial(); 1364 SSCOM_LOCK(sc); 1365 overflows = sc->sc_overflows; 1366 sc->sc_overflows = 0; 1367 floods = sc->sc_floods; 1368 sc->sc_floods = 0; 1369 sc->sc_errors = 0; 1370 SSCOM_UNLOCK(sc); 1371 splx(s); 1372 1373 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1374 sc->sc_dev.dv_xname, 1375 overflows, overflows == 1 ? "" : "s", 1376 floods, floods == 1 ? "" : "s"); 1377 } 1378 1379 integrate void 1380 sscom_rxsoft(struct sscom_softc *sc, struct tty *tp) 1381 { 1382 int (*rint) (int, struct tty *) = tp->t_linesw->l_rint; 1383 u_char *get, *end; 1384 u_int cc, scc; 1385 u_char rsr; 1386 int code; 1387 int s; 1388 1389 end = sc->sc_ebuf; 1390 get = sc->sc_rbget; 1391 scc = cc = sscom_rbuf_size - sc->sc_rbavail; 1392 1393 if (cc == sscom_rbuf_size) { 1394 sc->sc_floods++; 1395 if (sc->sc_errors++ == 0) 1396 callout_reset(&sc->sc_diag_callout, 60 * hz, 1397 sscomdiag, sc); 1398 } 1399 1400 while (cc) { 1401 code = get[0]; 1402 rsr = get[1]; 1403 if (rsr) { 1404 if (ISSET(rsr, UERSTAT_OVERRUN)) { 1405 sc->sc_overflows++; 1406 if (sc->sc_errors++ == 0) 1407 callout_reset(&sc->sc_diag_callout, 1408 60 * hz, sscomdiag, sc); 1409 } 1410 if (ISSET(rsr, UERSTAT_BREAK | UERSTAT_FRAME)) 1411 SET(code, TTY_FE); 1412 if (ISSET(rsr, UERSTAT_PARITY)) 1413 SET(code, TTY_PE); 1414 } 1415 if ((*rint)(code, tp) == -1) { 1416 /* 1417 * The line discipline's buffer is out of space. 1418 */ 1419 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1420 /* 1421 * We're either not using flow control, or the 1422 * line discipline didn't tell us to block for 1423 * some reason. Either way, we have no way to 1424 * know when there's more space available, so 1425 * just drop the rest of the data. 1426 */ 1427 get += cc << 1; 1428 if (get >= end) 1429 get -= sscom_rbuf_size << 1; 1430 cc = 0; 1431 } else { 1432 /* 1433 * Don't schedule any more receive processing 1434 * until the line discipline tells us there's 1435 * space available (through sscomhwiflow()). 1436 * Leave the rest of the data in the input 1437 * buffer. 1438 */ 1439 SET(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1440 } 1441 break; 1442 } 1443 get += 2; 1444 if (get >= end) 1445 get = sc->sc_rbuf; 1446 cc--; 1447 } 1448 1449 if (cc != scc) { 1450 sc->sc_rbget = get; 1451 s = splserial(); 1452 SSCOM_LOCK(sc); 1453 1454 cc = sc->sc_rbavail += scc - cc; 1455 /* Buffers should be ok again, release possible block. */ 1456 if (cc >= sc->sc_r_lowat) { 1457 if (ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1458 CLR(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1459 sscom_enable_rxint(sc); 1460 sc->sc_ucon |= UCON_ERRINT; 1461 bus_space_write_2(sc->sc_iot, sc->sc_ioh, SSCOM_UCON, 1462 sc->sc_ucon); 1463 1464 } 1465 if (ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED)) { 1466 CLR(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1467 sscom_hwiflow(sc); 1468 } 1469 } 1470 SSCOM_UNLOCK(sc); 1471 splx(s); 1472 } 1473 } 1474 1475 integrate void 1476 sscom_txsoft(struct sscom_softc *sc, struct tty *tp) 1477 { 1478 1479 CLR(tp->t_state, TS_BUSY); 1480 if (ISSET(tp->t_state, TS_FLUSH)) 1481 CLR(tp->t_state, TS_FLUSH); 1482 else 1483 ndflush(&tp->t_outq, (int)(sc->sc_tba - tp->t_outq.c_cf)); 1484 (*tp->t_linesw->l_start)(tp); 1485 } 1486 1487 integrate void 1488 sscom_stsoft(struct sscom_softc *sc, struct tty *tp) 1489 { 1490 u_char msr, delta; 1491 int s; 1492 1493 s = splserial(); 1494 SSCOM_LOCK(sc); 1495 msr = sc->sc_msts; 1496 delta = sc->sc_msr_delta; 1497 sc->sc_msr_delta = 0; 1498 SSCOM_UNLOCK(sc); 1499 splx(s); 1500 1501 if (ISSET(delta, sc->sc_msr_dcd)) { 1502 /* 1503 * Inform the tty layer that carrier detect changed. 1504 */ 1505 (void) (*tp->t_linesw->l_modem)(tp, ISSET(msr, MSTS_DCD)); 1506 } 1507 1508 if (ISSET(delta, sc->sc_msr_cts)) { 1509 /* Block or unblock output according to flow control. */ 1510 if (ISSET(msr, sc->sc_msr_cts)) { 1511 sc->sc_tx_stopped = 0; 1512 (*tp->t_linesw->l_start)(tp); 1513 } else { 1514 sc->sc_tx_stopped = 1; 1515 } 1516 } 1517 1518 if (sscom_debug) 1519 sscomstatus(sc, "sscom_stsoft"); 1520 } 1521 1522 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 1523 void 1524 sscomsoft(void *arg) 1525 { 1526 struct sscom_softc *sc = arg; 1527 struct tty *tp; 1528 1529 if (SSCOM_ISALIVE(sc) == 0) 1530 return; 1531 1532 { 1533 tp = sc->sc_tty; 1534 1535 if (sc->sc_rx_ready) { 1536 sc->sc_rx_ready = 0; 1537 sscom_rxsoft(sc, tp); 1538 } 1539 1540 if (sc->sc_st_check) { 1541 sc->sc_st_check = 0; 1542 sscom_stsoft(sc, tp); 1543 } 1544 1545 if (sc->sc_tx_done) { 1546 sc->sc_tx_done = 0; 1547 sscom_txsoft(sc, tp); 1548 } 1549 } 1550 } 1551 #else 1552 #error sscom needs GENERIC_SOFT_INERRUPTS 1553 #endif 1554 1555 1556 int 1557 sscomrxintr(void *arg) 1558 { 1559 struct sscom_softc *sc = arg; 1560 bus_space_tag_t iot = sc->sc_iot; 1561 bus_space_handle_t ioh = sc->sc_ioh; 1562 u_char *put, *end; 1563 u_int cc; 1564 1565 if (SSCOM_ISALIVE(sc) == 0) 1566 return 0; 1567 1568 SSCOM_LOCK(sc); 1569 1570 end = sc->sc_ebuf; 1571 put = sc->sc_rbput; 1572 cc = sc->sc_rbavail; 1573 1574 do { 1575 u_char msts, delta; 1576 u_char uerstat; 1577 uint16_t ufstat; 1578 1579 ufstat = bus_space_read_2(iot, ioh, SSCOM_UFSTAT); 1580 1581 /* XXX: break interrupt with no character? */ 1582 1583 if ( (ufstat & (UFSTAT_RXCOUNT|UFSTAT_RXFULL)) && 1584 !ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1585 1586 while (cc > 0) { 1587 int cn_trapped = 0; 1588 1589 /* get status and received character. 1590 read status register first */ 1591 uerstat = sscom_geterr(iot, ioh); 1592 put[0] = sscom_getc(iot, ioh); 1593 1594 if (ISSET(uerstat, UERSTAT_BREAK)) { 1595 int cn_trapped = 0; 1596 cn_check_magic(sc->sc_tty->t_dev, 1597 CNC_BREAK, sscom_cnm_state); 1598 if (cn_trapped) 1599 continue; 1600 #if defined(KGDB) 1601 if (ISSET(sc->sc_hwflags, 1602 SSCOM_HW_KGDB)) { 1603 kgdb_connect(1); 1604 continue; 1605 } 1606 #endif 1607 } 1608 1609 put[1] = uerstat; 1610 cn_check_magic(sc->sc_tty->t_dev, 1611 put[0], sscom_cnm_state); 1612 if (!cn_trapped) { 1613 put += 2; 1614 if (put >= end) 1615 put = sc->sc_rbuf; 1616 cc--; 1617 } 1618 1619 ufstat = bus_space_read_2(iot, ioh, SSCOM_UFSTAT); 1620 if ( (ufstat & (UFSTAT_RXFULL|UFSTAT_RXCOUNT)) == 0 ) 1621 break; 1622 } 1623 1624 /* 1625 * Current string of incoming characters ended because 1626 * no more data was available or we ran out of space. 1627 * Schedule a receive event if any data was received. 1628 * If we're out of space, turn off receive interrupts. 1629 */ 1630 sc->sc_rbput = put; 1631 sc->sc_rbavail = cc; 1632 if (!ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) 1633 sc->sc_rx_ready = 1; 1634 1635 /* 1636 * See if we are in danger of overflowing a buffer. If 1637 * so, use hardware flow control to ease the pressure. 1638 */ 1639 if (!ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED) && 1640 cc < sc->sc_r_hiwat) { 1641 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1642 sscom_hwiflow(sc); 1643 } 1644 1645 /* 1646 * If we're out of space, disable receive interrupts 1647 * until the queue has drained a bit. 1648 */ 1649 if (!cc) { 1650 SET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1651 sscom_disable_rxint(sc); 1652 sc->sc_ucon &= ~UCON_ERRINT; 1653 bus_space_write_2(iot, ioh, SSCOM_UCON, sc->sc_ucon); 1654 } 1655 } 1656 1657 1658 msts = sc->read_modem_status(sc); 1659 delta = msts ^ sc->sc_msts; 1660 sc->sc_msts = msts; 1661 1662 #ifdef notyet 1663 /* 1664 * Pulse-per-second (PSS) signals on edge of DCD? 1665 * Process these even if line discipline is ignoring DCD. 1666 */ 1667 if (delta & sc->sc_ppsmask) { 1668 struct timeval tv; 1669 if ((msr & sc->sc_ppsmask) == sc->sc_ppsassert) { 1670 /* XXX nanotime() */ 1671 microtime(&tv); 1672 TIMEVAL_TO_TIMESPEC(&tv, 1673 &sc->ppsinfo.assert_timestamp); 1674 if (sc->ppsparam.mode & PPS_OFFSETASSERT) { 1675 timespecadd(&sc->ppsinfo.assert_timestamp, 1676 &sc->ppsparam.assert_offset, 1677 &sc->ppsinfo.assert_timestamp); 1678 } 1679 1680 #ifdef PPS_SYNC 1681 if (sc->ppsparam.mode & PPS_HARDPPSONASSERT) 1682 hardpps(&tv, tv.tv_usec); 1683 #endif 1684 sc->ppsinfo.assert_sequence++; 1685 sc->ppsinfo.current_mode = sc->ppsparam.mode; 1686 1687 } else if ((msr & sc->sc_ppsmask) == sc->sc_ppsclear) { 1688 /* XXX nanotime() */ 1689 microtime(&tv); 1690 TIMEVAL_TO_TIMESPEC(&tv, 1691 &sc->ppsinfo.clear_timestamp); 1692 if (sc->ppsparam.mode & PPS_OFFSETCLEAR) { 1693 timespecadd(&sc->ppsinfo.clear_timestamp, 1694 &sc->ppsparam.clear_offset, 1695 &sc->ppsinfo.clear_timestamp); 1696 } 1697 1698 #ifdef PPS_SYNC 1699 if (sc->ppsparam.mode & PPS_HARDPPSONCLEAR) 1700 hardpps(&tv, tv.tv_usec); 1701 #endif 1702 sc->ppsinfo.clear_sequence++; 1703 sc->ppsinfo.current_mode = sc->ppsparam.mode; 1704 } 1705 } 1706 #endif 1707 1708 /* 1709 * Process normal status changes 1710 */ 1711 if (ISSET(delta, sc->sc_msr_mask)) { 1712 SET(sc->sc_msr_delta, delta); 1713 1714 /* 1715 * Stop output immediately if we lose the output 1716 * flow control signal or carrier detect. 1717 */ 1718 if (ISSET(~msts, sc->sc_msr_mask)) { 1719 sc->sc_tbc = 0; 1720 sc->sc_heldtbc = 0; 1721 #ifdef SSCOM_DEBUG 1722 if (sscom_debug) 1723 sscomstatus(sc, "sscomintr "); 1724 #endif 1725 } 1726 1727 sc->sc_st_check = 1; 1728 } 1729 1730 /* 1731 * Done handling any receive interrupts. 1732 */ 1733 1734 /* 1735 * If we've delayed a parameter change, do it 1736 * now, and restart * output. 1737 */ 1738 if ((ufstat & UFSTAT_TXCOUNT) == 0) { 1739 /* XXX: we should check transmitter empty also */ 1740 1741 if (sc->sc_heldchange) { 1742 sscom_loadchannelregs(sc); 1743 sc->sc_heldchange = 0; 1744 sc->sc_tbc = sc->sc_heldtbc; 1745 sc->sc_heldtbc = 0; 1746 } 1747 } 1748 1749 1750 } while (0); 1751 1752 SSCOM_UNLOCK(sc); 1753 1754 /* Wake up the poller. */ 1755 softintr_schedule(sc->sc_si); 1756 1757 #if NRND > 0 && defined(RND_COM) 1758 rnd_add_uint32(&sc->rnd_source, iir | rsr); 1759 #endif 1760 1761 return 1; 1762 } 1763 1764 int 1765 sscomtxintr(void *arg) 1766 { 1767 struct sscom_softc *sc = arg; 1768 bus_space_tag_t iot = sc->sc_iot; 1769 bus_space_handle_t ioh = sc->sc_ioh; 1770 uint16_t ufstat; 1771 1772 if (SSCOM_ISALIVE(sc) == 0) 1773 return 0; 1774 1775 SSCOM_LOCK(sc); 1776 1777 ufstat = bus_space_read_2(iot, ioh, SSCOM_UFSTAT); 1778 1779 /* 1780 * If we've delayed a parameter change, do it 1781 * now, and restart * output. 1782 */ 1783 if (sc->sc_heldchange && (ufstat & UFSTAT_TXCOUNT) == 0) { 1784 /* XXX: we should check transmitter empty also */ 1785 sscom_loadchannelregs(sc); 1786 sc->sc_heldchange = 0; 1787 sc->sc_tbc = sc->sc_heldtbc; 1788 sc->sc_heldtbc = 0; 1789 } 1790 1791 /* 1792 * See if data can be transmitted as well. Schedule tx 1793 * done event if no data left and tty was marked busy. 1794 */ 1795 if (!ISSET(ufstat,UFSTAT_TXFULL)) { 1796 /* 1797 * Output the next chunk of the contiguous 1798 * buffer, if any. 1799 */ 1800 if (sc->sc_tbc > 0) { 1801 __sscom_output_chunk(sc, ufstat); 1802 } 1803 else { 1804 /* 1805 * Disable transmit sscompletion 1806 * interrupts if necessary. 1807 */ 1808 if (sc->sc_hwflags & SSCOM_HW_TXINT) 1809 sscom_disable_txint(sc); 1810 if (sc->sc_tx_busy) { 1811 sc->sc_tx_busy = 0; 1812 sc->sc_tx_done = 1; 1813 } 1814 } 1815 } 1816 1817 SSCOM_UNLOCK(sc); 1818 1819 /* Wake up the poller. */ 1820 softintr_schedule(sc->sc_si); 1821 1822 #if NRND > 0 && defined(RND_COM) 1823 rnd_add_uint32(&sc->rnd_source, iir | rsr); 1824 #endif 1825 1826 return 1; 1827 } 1828 1829 1830 #if defined(KGDB) || defined(SSCOM0CONSOLE) || defined(SSCOM1CONSOLE) 1831 /* 1832 * Initialize UART for use as console or KGDB line. 1833 */ 1834 static int 1835 sscom_init(bus_space_tag_t iot, const struct sscom_uart_info *config, 1836 int rate, int frequency, tcflag_t cflag, bus_space_handle_t *iohp) 1837 { 1838 bus_space_handle_t ioh; 1839 bus_addr_t iobase = config->iobase; 1840 1841 if (bus_space_map(iot, iobase, SSCOM_SIZE, 0, &ioh)) 1842 return ENOMEM; /* ??? */ 1843 1844 bus_space_write_2(iot, ioh, SSCOM_UCON, 0); 1845 bus_space_write_1(iot, ioh, SSCOM_UFCON, 1846 UFCON_TXTRIGGER_8 | UFCON_RXTRIGGER_8 | 1847 UFCON_TXFIFO_RESET | UFCON_RXFIFO_RESET | 1848 UFCON_FIFO_ENABLE ); 1849 /* tx/rx fifo reset are auto-cleared */ 1850 1851 rate = sscomspeed(rate, frequency); 1852 bus_space_write_2(iot, ioh, SSCOM_UBRDIV, rate); 1853 bus_space_write_2(iot, ioh, SSCOM_ULCON, cflag2lcr(cflag)); 1854 1855 /* enable UART */ 1856 bus_space_write_2(iot, ioh, SSCOM_UCON, 1857 UCON_TXMODE_INT|UCON_RXMODE_INT); 1858 bus_space_write_2(iot, ioh, SSCOM_UMCON, UMCON_RTS); 1859 1860 *iohp = ioh; 1861 return 0; 1862 } 1863 1864 #endif 1865 1866 #if defined(SSCOM0CONSOLE) || defined(SSCOM1CONSOLE) 1867 /* 1868 * Following are all routines needed for SSCOM to act as console 1869 */ 1870 struct consdev sscomcons = { 1871 NULL, NULL, sscomcngetc, sscomcnputc, sscomcnpollc, NULL, 1872 NULL, NULL, NODEV, CN_NORMAL 1873 }; 1874 1875 1876 int 1877 sscom_cnattach(bus_space_tag_t iot, const struct sscom_uart_info *config, 1878 int rate, int frequency, tcflag_t cflag) 1879 { 1880 int res; 1881 1882 res = sscom_init(iot, config, rate, frequency, cflag, &sscomconsioh); 1883 if (res) 1884 return res; 1885 1886 cn_tab = &sscomcons; 1887 cn_init_magic(&sscom_cnm_state); 1888 cn_set_magic("\047\001"); /* default magic is BREAK */ 1889 1890 sscomconstag = iot; 1891 sscomconsunit = config->unit; 1892 sscomconsrate = rate; 1893 sscomconscflag = cflag; 1894 1895 return 0; 1896 } 1897 1898 void 1899 sscom_cndetach(void) 1900 { 1901 bus_space_unmap(sscomconstag, sscomconsioh, SSCOM_SIZE); 1902 sscomconstag = NULL; 1903 1904 cn_tab = NULL; 1905 } 1906 1907 /* 1908 * The read-ahead code is so that you can detect pending in-band 1909 * cn_magic in polled mode while doing output rather than having to 1910 * wait until the kernel decides it needs input. 1911 */ 1912 1913 #define MAX_READAHEAD 20 1914 static int sscom_readahead[MAX_READAHEAD]; 1915 static int sscom_readaheadcount = 0; 1916 1917 int 1918 sscomcngetc(dev_t dev) 1919 { 1920 int s = splserial(); 1921 u_char stat, c; 1922 1923 /* got a character from reading things earlier */ 1924 if (sscom_readaheadcount > 0) { 1925 int i; 1926 1927 c = sscom_readahead[0]; 1928 for (i = 1; i < sscom_readaheadcount; i++) { 1929 sscom_readahead[i-1] = sscom_readahead[i]; 1930 } 1931 sscom_readaheadcount--; 1932 splx(s); 1933 return c; 1934 } 1935 1936 /* block until a character becomes available */ 1937 while (!sscom_rxrdy(sscomconstag, sscomconsioh)) 1938 ; 1939 1940 c = sscom_getc(sscomconstag, sscomconsioh); 1941 stat = sscom_geterr(sscomconstag, sscomconsioh); 1942 { 1943 int cn_trapped = 0; /* unused */ 1944 #ifdef DDB 1945 extern int db_active; 1946 if (!db_active) 1947 #endif 1948 cn_check_magic(dev, c, sscom_cnm_state); 1949 } 1950 splx(s); 1951 return c; 1952 } 1953 1954 /* 1955 * Console kernel output character routine. 1956 */ 1957 void 1958 sscomcnputc(dev_t dev, int c) 1959 { 1960 int s = splserial(); 1961 int timo; 1962 1963 int cin, stat; 1964 if (sscom_readaheadcount < MAX_READAHEAD && 1965 sscom_rxrdy(sscomconstag, sscomconsioh)) { 1966 1967 int cn_trapped = 0; 1968 cin = sscom_getc(sscomconstag, sscomconsioh); 1969 stat = sscom_geterr(sscomconstag, sscomconsioh); 1970 cn_check_magic(dev, cin, sscom_cnm_state); 1971 sscom_readahead[sscom_readaheadcount++] = cin; 1972 } 1973 1974 /* wait for any pending transmission to finish */ 1975 timo = 150000; 1976 while (ISSET(bus_space_read_2(sscomconstag, sscomconsioh, SSCOM_UFSTAT), 1977 UFSTAT_TXFULL) && --timo) 1978 continue; 1979 1980 bus_space_write_1(sscomconstag, sscomconsioh, SSCOM_UTXH, c); 1981 SSCOM_BARRIER(sscomconstag, sscomconsioh, BR | BW); 1982 1983 #if 0 1984 /* wait for this transmission to complete */ 1985 timo = 1500000; 1986 while (!ISSET(bus_space_read_1(sscomconstag, sscomconsioh, SSCOM_UTRSTAT), 1987 UTRSTAT_TXEMPTY) && --timo) 1988 continue; 1989 #endif 1990 splx(s); 1991 } 1992 1993 void 1994 sscomcnpollc(dev_t dev, int on) 1995 { 1996 1997 } 1998 1999 #endif /* SSCOM0CONSOLE||SSCOM1CONSOLE */ 2000 2001 #ifdef KGDB 2002 int 2003 sscom_kgdb_attach(bus_space_tag_t iot, const struct sscom_uart_info *config, 2004 int rate, int frequency, tcflag_t cflag) 2005 { 2006 int res; 2007 2008 if (iot == sscomconstag && config->unit == sscomconsunit) { 2009 printf( "console==kgdb_port (%d): kgdb disabled\n", sscomconsunit); 2010 return EBUSY; /* cannot share with console */ 2011 } 2012 2013 res = sscom_init(iot, config, rate, frequency, cflag, &sscom_kgdb_ioh); 2014 if (res) 2015 return res; 2016 2017 kgdb_attach(sscom_kgdb_getc, sscom_kgdb_putc, NULL); 2018 kgdb_dev = 123; /* unneeded, only to satisfy some tests */ 2019 2020 sscom_kgdb_iot = iot; 2021 sscom_kgdb_unit = config->unit; 2022 2023 return 0; 2024 } 2025 2026 /* ARGSUSED */ 2027 int 2028 sscom_kgdb_getc(void *arg) 2029 { 2030 int c, stat; 2031 2032 /* block until a character becomes available */ 2033 while (!sscom_rxrdy(sscom_kgdb_iot, sscom_kgdb_ioh)) 2034 ; 2035 2036 c = sscom_getc(sscom_kgdb_iot, sscom_kgdb_ioh); 2037 stat = sscom_geterr(sscom_kgdb_iot, sscom_kgdb_ioh); 2038 2039 return c; 2040 } 2041 2042 /* ARGSUSED */ 2043 void 2044 sscom_kgdb_putc(void *arg, int c) 2045 { 2046 int timo; 2047 2048 /* wait for any pending transmission to finish */ 2049 timo = 150000; 2050 while (ISSET(bus_space_read_2(sscom_kgdb_iot, sscom_kgdb_ioh, 2051 SSCOM_UFSTAT), UFSTAT_TXFULL) && --timo) 2052 continue; 2053 2054 bus_space_write_1(sscom_kgdb_iot, sscom_kgdb_ioh, SSCOM_UTXH, c); 2055 SSCOM_BARRIER(sscom_kgdb_iot, sscom_kgdb_ioh, BR | BW); 2056 2057 #if 0 2058 /* wait for this transmission to complete */ 2059 timo = 1500000; 2060 while (!ISSET(bus_space_read_1(sscom_kgdb_iot, sscom_kgdb_ioh, 2061 SSCOM_UTRSTAT), UTRSTAT_TXEMPTY) && --timo) 2062 continue; 2063 #endif 2064 } 2065 #endif /* KGDB */ 2066 2067 /* helper function to identify the sscom ports used by 2068 console or KGDB (and not yet autoconf attached) */ 2069 int 2070 sscom_is_console(bus_space_tag_t iot, int unit, 2071 bus_space_handle_t *ioh) 2072 { 2073 bus_space_handle_t help; 2074 2075 if (!sscomconsattached && 2076 iot == sscomconstag && unit == sscomconsunit) 2077 help = sscomconsioh; 2078 #ifdef KGDB 2079 else if (!sscom_kgdb_attached && 2080 iot == sscom_kgdb_iot && unit == sscom_kgdb_unit) 2081 help = sscom_kgdb_ioh; 2082 #endif 2083 else 2084 return 0; 2085 2086 if (ioh) 2087 *ioh = help; 2088 return 1; 2089 } 2090
Indexes created Mon Sep 29 03:10:08 GMT 2025