sscom.c revision 1.36
1 /* $NetBSD: sscom.c,v 1.36 2012/02/04 18:50:42 christos 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 1.36 2012/02/04 18:50:42 christos Exp $"); 102 103 #include "opt_sscom.h" 104 #include "opt_ddb.h" 105 #include "opt_kgdb.h" 106 #include "opt_multiprocessor.h" 107 #include "opt_lockdebug.h" 108 109 #include "rnd.h" 110 #ifdef RND_COM 111 #include <sys/rnd.h> 112 #endif 113 114 /* 115 * Override cnmagic(9) macro before including <sys/systm.h>. 116 * We need to know if cn_check_magic triggered debugger, so set a flag. 117 * Callers of cn_check_magic must declare int cn_trapped = 0; 118 * XXX: this is *ugly*! 119 */ 120 #define cn_trap() \ 121 do { \ 122 console_debugger(); \ 123 cn_trapped = 1; \ 124 } while (/* CONSTCOND */ 0) 125 126 #include <sys/param.h> 127 #include <sys/systm.h> 128 #include <sys/ioctl.h> 129 #include <sys/select.h> 130 #include <sys/tty.h> 131 #include <sys/proc.h> 132 #include <sys/conf.h> 133 #include <sys/file.h> 134 #include <sys/uio.h> 135 #include <sys/kernel.h> 136 #include <sys/syslog.h> 137 #include <sys/types.h> 138 #include <sys/device.h> 139 #include <sys/malloc.h> 140 #include <sys/timepps.h> 141 #include <sys/vnode.h> 142 #include <sys/kauth.h> 143 #include <sys/intr.h> 144 #include <sys/bus.h> 145 146 #include <arm/s3c2xx0/s3c2xx0reg.h> 147 #include <arm/s3c2xx0/s3c2xx0var.h> 148 #if defined(SSCOM_S3C2410) || defined(SSCOM_S3C2400) || defined(SSCOM_S3C2440) 149 #include <arm/s3c2xx0/s3c24x0reg.h> 150 #elif defined(SSCOM_S3C2800) 151 #include <arm/s3c2xx0/s3c2800reg.h> 152 #endif 153 #include <arm/s3c2xx0/sscom_var.h> 154 #include <dev/cons.h> 155 156 dev_type_open(sscomopen); 157 dev_type_close(sscomclose); 158 dev_type_read(sscomread); 159 dev_type_write(sscomwrite); 160 dev_type_ioctl(sscomioctl); 161 dev_type_stop(sscomstop); 162 dev_type_tty(sscomtty); 163 dev_type_poll(sscompoll); 164 165 int sscomcngetc (dev_t); 166 void sscomcnputc (dev_t, int); 167 void sscomcnpollc (dev_t, int); 168 169 #define integrate static inline 170 void sscomsoft (void *); 171 172 integrate void sscom_rxsoft (struct sscom_softc *, struct tty *); 173 integrate void sscom_txsoft (struct sscom_softc *, struct tty *); 174 integrate void sscom_stsoft (struct sscom_softc *, struct tty *); 175 integrate void sscom_schedrx (struct sscom_softc *); 176 static void sscom_modem(struct sscom_softc *, int); 177 static void sscom_break(struct sscom_softc *, int); 178 static void sscom_iflush(struct sscom_softc *); 179 static void sscom_hwiflow(struct sscom_softc *); 180 static void sscom_loadchannelregs(struct sscom_softc *); 181 static void tiocm_to_sscom(struct sscom_softc *, u_long, int); 182 static int sscom_to_tiocm(struct sscom_softc *); 183 static void tiocm_to_sscom(struct sscom_softc *, u_long, int); 184 static int sscom_to_tiocm(struct sscom_softc *); 185 static void sscom_iflush(struct sscom_softc *); 186 187 static int sscomhwiflow(struct tty *tp, int block); 188 static int sscom_init(bus_space_tag_t, const struct sscom_uart_info *, 189 int, int, tcflag_t, bus_space_handle_t *); 190 191 extern struct cfdriver sscom_cd; 192 193 const struct cdevsw sscom_cdevsw = { 194 sscomopen, sscomclose, sscomread, sscomwrite, sscomioctl, 195 sscomstop, sscomtty, sscompoll, nommap, ttykqfilter, D_TTY 196 }; 197 198 /* 199 * Make this an option variable one can patch. 200 * But be warned: this must be a power of 2! 201 */ 202 u_int sscom_rbuf_size = SSCOM_RING_SIZE; 203 204 /* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */ 205 u_int sscom_rbuf_hiwat = (SSCOM_RING_SIZE * 1) / 4; 206 u_int sscom_rbuf_lowat = (SSCOM_RING_SIZE * 3) / 4; 207 208 static int sscomconsunit = -1; 209 static bus_space_tag_t sscomconstag; 210 static bus_space_handle_t sscomconsioh; 211 static int sscomconsattached; 212 static int sscomconsrate; 213 static tcflag_t sscomconscflag; 214 static struct cnm_state sscom_cnm_state; 215 216 #ifdef KGDB 217 #include <sys/kgdb.h> 218 219 static int sscom_kgdb_unit = -1; 220 static bus_space_tag_t sscom_kgdb_iot; 221 static bus_space_handle_t sscom_kgdb_ioh; 222 static int sscom_kgdb_attached; 223 224 int sscom_kgdb_getc (void *); 225 void sscom_kgdb_putc (void *, int); 226 #endif /* KGDB */ 227 228 #define SSCOMUNIT_MASK 0x7f 229 #define SSCOMDIALOUT_MASK 0x80 230 231 #define SSCOMUNIT(x) (minor(x) & SSCOMUNIT_MASK) 232 #define SSCOMDIALOUT(x) (minor(x) & SSCOMDIALOUT_MASK) 233 234 #if 0 235 #define SSCOM_ISALIVE(sc) ((sc)->enabled != 0 && \ 236 device_is_active(&(sc)->sc_dev)) 237 #else 238 #define SSCOM_ISALIVE(sc) device_is_active((sc)->sc_dev) 239 #endif 240 241 #define BR BUS_SPACE_BARRIER_READ 242 #define BW BUS_SPACE_BARRIER_WRITE 243 #define SSCOM_BARRIER(t, h, f) /* no-op */ 244 245 #if (defined(MULTIPROCESSOR) || defined(LOCKDEBUG)) && defined(SSCOM_MPLOCK) 246 247 #define SSCOM_LOCK(sc) simple_lock((sc)->sc_lock) 248 #define SSCOM_UNLOCK(sc) simple_unlock((sc)->sc_lock) 249 250 #else 251 252 #define SSCOM_LOCK(sc) 253 #define SSCOM_UNLOCK(sc) 254 255 #endif 256 257 #ifndef SSCOM_TOLERANCE 258 #define SSCOM_TOLERANCE 30 /* XXX: baud rate tolerance, in 0.1% units */ 259 #endif 260 261 /* value for UCON */ 262 #define UCON_RXINT_MASK \ 263 (UCON_RXMODE_MASK|UCON_ERRINT|UCON_TOINT|UCON_RXINT_TYPE) 264 #define UCON_RXINT_ENABLE \ 265 (UCON_RXMODE_INT|UCON_ERRINT|UCON_TOINT|UCON_RXINT_TYPE_LEVEL) 266 #define UCON_TXINT_MASK (UCON_TXMODE_MASK|UCON_TXINT_TYPE) 267 #define UCON_TXINT_ENABLE (UCON_TXMODE_INT|UCON_TXINT_TYPE_LEVEL) 268 269 /* we don't want tx interrupt on debug port, but it is needed to 270 have transmitter active */ 271 #define UCON_DEBUGPORT (UCON_RXINT_ENABLE|UCON_TXINT_ENABLE) 272 273 274 static inline void 275 __sscom_output_chunk(struct sscom_softc *sc, int ufstat) 276 { 277 int n, space; 278 bus_space_tag_t iot = sc->sc_iot; 279 bus_space_handle_t ioh = sc->sc_ioh; 280 281 n = sc->sc_tbc; 282 space = 16 - ((ufstat & UFSTAT_TXCOUNT) >> UFSTAT_TXCOUNT_SHIFT); 283 284 if (n > space) 285 n = space; 286 287 if (n > 0) { 288 bus_space_write_multi_1(iot, ioh, SSCOM_UTXH, sc->sc_tba, n); 289 sc->sc_tbc -= n; 290 sc->sc_tba += n; 291 } 292 } 293 294 static void 295 sscom_output_chunk(struct sscom_softc *sc) 296 { 297 int ufstat = bus_space_read_2(sc->sc_iot, sc->sc_ioh, SSCOM_UFSTAT); 298 299 if (!(ufstat & UFSTAT_TXFULL)) 300 __sscom_output_chunk(sc, ufstat); 301 } 302 303 int 304 sscomspeed(long speed, long frequency) 305 { 306 #define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */ 307 308 int x, err; 309 310 if (speed <= 0) 311 return -1; 312 x = divrnd(frequency / 16, speed); 313 if (x <= 0) 314 return -1; 315 err = divrnd(((quad_t)frequency) * 1000 / 16, speed * x) - 1000; 316 if (err < 0) 317 err = -err; 318 if (err > SSCOM_TOLERANCE) 319 return -1; 320 return x-1; 321 322 #undef divrnd 323 } 324 325 void sscomstatus (struct sscom_softc *, const char *); 326 327 #ifdef SSCOM_DEBUG 328 int sscom_debug = 0; 329 330 void 331 sscomstatus(struct sscom_softc *sc, const char *str) 332 { 333 struct tty *tp = sc->sc_tty; 334 int umstat = bus_space_read_1(sc->sc_iot, sc->sc_iot, SSCOM_UMSTAT); 335 int umcon = bus_space_read_1(sc->sc_iot, sc->sc_iot, SSCOM_UMCON); 336 337 printf("%s: %s %sclocal %sdcd %sts_carr_on %sdtr %stx_stopped\n", 338 sc->sc_dev->dv_xname, str, 339 ISSET(tp->t_cflag, CLOCAL) ? "+" : "-", 340 "+", /* DCD */ 341 ISSET(tp->t_state, TS_CARR_ON) ? "+" : "-", 342 "+", /* DTR */ 343 sc->sc_tx_stopped ? "+" : "-"); 344 345 printf("%s: %s %scrtscts %scts %sts_ttstop %srts %xrx_flags\n", 346 sc->sc_dev->dv_xname, str, 347 ISSET(tp->t_cflag, CRTSCTS) ? "+" : "-", 348 ISSET(umstat, UMSTAT_CTS) ? "+" : "-", 349 ISSET(tp->t_state, TS_TTSTOP) ? "+" : "-", 350 ISSET(umcon, UMCON_RTS) ? "+" : "-", 351 sc->sc_rx_flags); 352 } 353 #else 354 #define sscom_debug 0 355 #endif 356 357 static void 358 sscom_enable_debugport(struct sscom_softc *sc) 359 { 360 int s; 361 362 /* Turn on line break interrupt, set carrier. */ 363 s = splserial(); 364 SSCOM_LOCK(sc); 365 sc->sc_ucon = UCON_DEBUGPORT; 366 bus_space_write_2(sc->sc_iot, sc->sc_ioh, SSCOM_UCON, sc->sc_ucon); 367 sc->sc_umcon = UMCON_RTS|UMCON_DTR; 368 sc->set_modem_control(sc); 369 sscom_enable_rxint(sc); 370 sscom_disable_txint(sc); 371 SSCOM_UNLOCK(sc); 372 splx(s); 373 } 374 375 static void 376 sscom_set_modem_control(struct sscom_softc *sc) 377 { 378 /* flob RTS */ 379 bus_space_write_1(sc->sc_iot, sc->sc_ioh, 380 SSCOM_UMCON, sc->sc_umcon & UMCON_HW_MASK); 381 /* ignore DTR */ 382 } 383 384 static int 385 sscom_read_modem_status(struct sscom_softc *sc) 386 { 387 int msts; 388 389 msts = bus_space_read_1(sc->sc_iot, sc->sc_ioh, SSCOM_UMSTAT); 390 391 /* DCD and DSR are always on */ 392 return (msts & UMSTAT_CTS) | MSTS_DCD | MSTS_DSR; 393 } 394 395 void 396 sscom_attach_subr(struct sscom_softc *sc) 397 { 398 int unit = sc->sc_unit; 399 bus_space_tag_t iot = sc->sc_iot; 400 bus_space_handle_t ioh = sc->sc_ioh; 401 struct tty *tp; 402 403 callout_init(&sc->sc_diag_callout, 0); 404 #if (defined(MULTIPROCESSOR) || defined(LOCKDEBUG)) && defined(SSCOM_MPLOCK) 405 simple_lock_init(&sc->sc_lock); 406 #endif 407 408 sc->sc_ucon = UCON_RXINT_ENABLE|UCON_TXINT_ENABLE; 409 410 /* 411 * set default for modem control hook 412 */ 413 if (sc->set_modem_control == NULL) 414 sc->set_modem_control = sscom_set_modem_control; 415 if (sc->read_modem_status == NULL) 416 sc->read_modem_status = sscom_read_modem_status; 417 418 /* Disable interrupts before configuring the device. */ 419 sscom_disable_txrxint(sc); 420 421 #ifdef KGDB 422 /* 423 * Allow kgdb to "take over" this port. If this is 424 * the kgdb device, it has exclusive use. 425 */ 426 if (unit == sscom_kgdb_unit) { 427 SET(sc->sc_hwflags, SSCOM_HW_KGDB); 428 sc->sc_ucon = UCON_DEBUGPORT; 429 } 430 #endif 431 432 if (unit == sscomconsunit) { 433 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 #ifdef SSCOM_S3C2440 448 UFCON_TXTRIGGER_16|UFCON_RXTRIGGER_16|UFCON_FIFO_ENABLE| 449 #else 450 UFCON_TXTRIGGER_8|UFCON_RXTRIGGER_8|UFCON_FIFO_ENABLE| 451 #endif 452 UFCON_TXFIFO_RESET|UFCON_RXFIFO_RESET); 453 454 bus_space_write_1(iot, ioh, SSCOM_UCON, sc->sc_ucon); 455 456 #ifdef KGDB 457 if (ISSET(sc->sc_hwflags, SSCOM_HW_KGDB)) { 458 sscom_kgdb_attached = 1; 459 printf("%s: kgdb\n", sc->sc_dev->dv_xname); 460 sscom_enable_debugport(sc); 461 return; 462 } 463 #endif 464 465 tp = tty_alloc(); 466 tp->t_oproc = sscomstart; 467 tp->t_param = sscomparam; 468 tp->t_hwiflow = sscomhwiflow; 469 470 sc->sc_tty = tp; 471 sc->sc_rbuf = malloc(sscom_rbuf_size << 1, M_DEVBUF, M_NOWAIT); 472 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 473 sc->sc_rbavail = sscom_rbuf_size; 474 if (sc->sc_rbuf == NULL) { 475 printf("%s: unable to allocate ring buffer\n", 476 sc->sc_dev->dv_xname); 477 return; 478 } 479 sc->sc_ebuf = sc->sc_rbuf + (sscom_rbuf_size << 1); 480 481 tty_attach(tp); 482 483 if (ISSET(sc->sc_hwflags, SSCOM_HW_CONSOLE)) { 484 int maj; 485 486 /* locate the major number */ 487 maj = cdevsw_lookup_major(&sscom_cdevsw); 488 489 cn_tab->cn_dev = makedev(maj, device_unit(sc->sc_dev)); 490 491 printf("%s: console (major=%d)\n", device_xname(sc->sc_dev), maj); 492 } 493 494 495 sc->sc_si = softint_establish(SOFTINT_SERIAL, sscomsoft, sc); 496 497 #ifdef RND_COM 498 rnd_attach_source(&sc->rnd_source, sc->sc_dev.dv_xname, 499 RND_TYPE_TTY, 0); 500 #endif 501 502 /* if there are no enable/disable functions, assume the device 503 is always enabled */ 504 505 if (ISSET(sc->sc_hwflags, SSCOM_HW_CONSOLE)) 506 sscom_enable_debugport(sc); 507 else 508 sscom_disable_txrxint(sc); 509 510 SET(sc->sc_hwflags, SSCOM_HW_DEV_OK); 511 } 512 513 int 514 sscom_detach(device_t self, int flags) 515 { 516 struct sscom_softc *sc = device_private(self); 517 518 if (sc->sc_hwflags & (SSCOM_HW_CONSOLE|SSCOM_HW_KGDB)) 519 return EBUSY; 520 521 return 0; 522 } 523 524 int 525 sscom_activate(device_t self, enum devact act) 526 { 527 #ifdef notyet 528 struct sscom_softc *sc = device_private(self); 529 #endif 530 531 switch (act) { 532 case DVACT_DEACTIVATE: 533 #ifdef notyet 534 sc->enabled = 0; 535 #endif 536 return 0; 537 default: 538 return EOPNOTSUPP; 539 } 540 } 541 542 void 543 sscom_shutdown(struct sscom_softc *sc) 544 { 545 #ifdef notyet 546 struct tty *tp = sc->sc_tty; 547 int s; 548 549 s = splserial(); 550 SSCOM_LOCK(sc); 551 552 /* If we were asserting flow control, then deassert it. */ 553 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 554 sscom_hwiflow(sc); 555 556 /* Clear any break condition set with TIOCSBRK. */ 557 sscom_break(sc, 0); 558 559 /* 560 * Hang up if necessary. Wait a bit, so the other side has time to 561 * notice even if we immediately open the port again. 562 * Avoid tsleeping above splhigh(). 563 */ 564 if (ISSET(tp->t_cflag, HUPCL)) { 565 sscom_modem(sc, 0); 566 SSCOM_UNLOCK(sc); 567 splx(s); 568 /* XXX tsleep will only timeout */ 569 (void) tsleep(sc, TTIPRI, ttclos, hz); 570 s = splserial(); 571 SSCOM_LOCK(sc); 572 } 573 574 if (ISSET(sc->sc_hwflags, SSCOM_HW_CONSOLE)) 575 /* interrupt on break */ 576 sc->sc_ucon = UCON_DEBUGPORT; 577 else 578 sc->sc_ucon = 0; 579 bus_space_write_2(sc->sc_iot, sc->sc_ioh, SSCOM_UCON, sc->sc_ucon); 580 581 #ifdef DIAGNOSTIC 582 if (!sc->enabled) 583 panic("sscom_shutdown: not enabled?"); 584 #endif 585 sc->enabled = 0; 586 SSCOM_UNLOCK(sc); 587 splx(s); 588 #endif 589 } 590 591 int 592 sscomopen(dev_t dev, int flag, int mode, struct lwp *l) 593 { 594 struct sscom_softc *sc; 595 struct tty *tp; 596 int s, s2; 597 int error; 598 599 sc = device_lookup_private(&sscom_cd, SSCOMUNIT(dev)); 600 if (sc == NULL || !ISSET(sc->sc_hwflags, SSCOM_HW_DEV_OK) || 601 sc->sc_rbuf == NULL) 602 return ENXIO; 603 604 if (!device_is_active(sc->sc_dev)) 605 return ENXIO; 606 607 #ifdef KGDB 608 /* 609 * If this is the kgdb port, no other use is permitted. 610 */ 611 if (ISSET(sc->sc_hwflags, SSCOM_HW_KGDB)) 612 return EBUSY; 613 #endif 614 615 tp = sc->sc_tty; 616 617 if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp)) 618 return (EBUSY); 619 620 s = spltty(); 621 622 /* 623 * Do the following iff this is a first open. 624 */ 625 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 626 struct termios t; 627 628 tp->t_dev = dev; 629 630 s2 = splserial(); 631 SSCOM_LOCK(sc); 632 633 /* Turn on interrupts. */ 634 sscom_enable_txrxint(sc); 635 636 /* Fetch the current modem control status, needed later. */ 637 sc->sc_msts = sc->read_modem_status(sc); 638 639 #if 0 640 /* Clear PPS capture state on first open. */ 641 sc->sc_ppsmask = 0; 642 sc->ppsparam.mode = 0; 643 #endif 644 645 SSCOM_UNLOCK(sc); 646 splx(s2); 647 648 /* 649 * Initialize the termios status to the defaults. Add in the 650 * sticky bits from TIOCSFLAGS. 651 */ 652 t.c_ispeed = 0; 653 if (ISSET(sc->sc_hwflags, SSCOM_HW_CONSOLE)) { 654 t.c_ospeed = sscomconsrate; 655 t.c_cflag = sscomconscflag; 656 } else { 657 t.c_ospeed = TTYDEF_SPEED; 658 t.c_cflag = TTYDEF_CFLAG; 659 } 660 if (ISSET(sc->sc_swflags, TIOCFLAG_CLOCAL)) 661 SET(t.c_cflag, CLOCAL); 662 if (ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS)) 663 SET(t.c_cflag, CRTSCTS); 664 if (ISSET(sc->sc_swflags, TIOCFLAG_MDMBUF)) 665 SET(t.c_cflag, MDMBUF); 666 /* Make sure sscomparam() will do something. */ 667 tp->t_ospeed = 0; 668 (void) sscomparam(tp, &t); 669 tp->t_iflag = TTYDEF_IFLAG; 670 tp->t_oflag = TTYDEF_OFLAG; 671 tp->t_lflag = TTYDEF_LFLAG; 672 ttychars(tp); 673 ttsetwater(tp); 674 675 s2 = splserial(); 676 SSCOM_LOCK(sc); 677 678 /* 679 * Turn on DTR. We must always do this, even if carrier is not 680 * present, because otherwise we'd have to use TIOCSDTR 681 * immediately after setting CLOCAL, which applications do not 682 * expect. We always assert DTR while the device is open 683 * unless explicitly requested to deassert it. 684 */ 685 sscom_modem(sc, 1); 686 687 /* Clear the input ring, and unblock. */ 688 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 689 sc->sc_rbavail = sscom_rbuf_size; 690 sscom_iflush(sc); 691 CLR(sc->sc_rx_flags, RX_ANY_BLOCK); 692 sscom_hwiflow(sc); 693 694 if (sscom_debug) 695 sscomstatus(sc, "sscomopen "); 696 697 SSCOM_UNLOCK(sc); 698 splx(s2); 699 } 700 701 splx(s); 702 703 error = ttyopen(tp, SSCOMDIALOUT(dev), ISSET(flag, O_NONBLOCK)); 704 if (error) 705 goto bad; 706 707 error = (*tp->t_linesw->l_open)(dev, tp); 708 if (error) 709 goto bad; 710 711 return 0; 712 713 bad: 714 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 715 /* 716 * We failed to open the device, and nobody else had it opened. 717 * Clean up the state as appropriate. 718 */ 719 sscom_shutdown(sc); 720 } 721 722 return error; 723 } 724 725 int 726 sscomclose(dev_t dev, int flag, int mode, struct lwp *l) 727 { 728 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(dev)); 729 struct tty *tp = sc->sc_tty; 730 731 /* XXX This is for cons.c. */ 732 if (!ISSET(tp->t_state, TS_ISOPEN)) 733 return 0; 734 735 (*tp->t_linesw->l_close)(tp, flag); 736 ttyclose(tp); 737 738 if (SSCOM_ISALIVE(sc) == 0) 739 return 0; 740 741 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 742 /* 743 * Although we got a last close, the device may still be in 744 * use; e.g. if this was the dialout node, and there are still 745 * processes waiting for carrier on the non-dialout node. 746 */ 747 sscom_shutdown(sc); 748 } 749 750 return 0; 751 } 752 753 int 754 sscomread(dev_t dev, struct uio *uio, int flag) 755 { 756 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(dev)); 757 struct tty *tp = sc->sc_tty; 758 759 if (SSCOM_ISALIVE(sc) == 0) 760 return EIO; 761 762 return (*tp->t_linesw->l_read)(tp, uio, flag); 763 } 764 765 int 766 sscomwrite(dev_t dev, struct uio *uio, int flag) 767 { 768 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(dev)); 769 struct tty *tp = sc->sc_tty; 770 771 if (SSCOM_ISALIVE(sc) == 0) 772 return EIO; 773 774 return (*tp->t_linesw->l_write)(tp, uio, flag); 775 } 776 777 int 778 sscompoll(dev_t dev, int events, struct lwp *l) 779 { 780 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(dev)); 781 struct tty *tp = sc->sc_tty; 782 783 if (SSCOM_ISALIVE(sc) == 0) 784 return EIO; 785 786 return (*tp->t_linesw->l_poll)(tp, events, l); 787 } 788 789 struct tty * 790 sscomtty(dev_t dev) 791 { 792 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(dev)); 793 struct tty *tp = sc->sc_tty; 794 795 return tp; 796 } 797 798 int 799 sscomioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 800 { 801 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(dev)); 802 struct tty *tp = sc->sc_tty; 803 int error; 804 int s; 805 806 if (SSCOM_ISALIVE(sc) == 0) 807 return EIO; 808 809 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 810 if (error != EPASSTHROUGH) 811 return error; 812 813 error = ttioctl(tp, cmd, data, flag, l); 814 if (error != EPASSTHROUGH) 815 return error; 816 817 error = 0; 818 819 s = splserial(); 820 SSCOM_LOCK(sc); 821 822 switch (cmd) { 823 case TIOCSBRK: 824 sscom_break(sc, 1); 825 break; 826 827 case TIOCCBRK: 828 sscom_break(sc, 0); 829 break; 830 831 case TIOCSDTR: 832 sscom_modem(sc, 1); 833 break; 834 835 case TIOCCDTR: 836 sscom_modem(sc, 0); 837 break; 838 839 case TIOCGFLAGS: 840 *(int *)data = sc->sc_swflags; 841 break; 842 843 case TIOCSFLAGS: 844 error = kauth_authorize_device_tty(l->l_cred, 845 KAUTH_DEVICE_TTY_PRIVSET, tp); 846 if (error) 847 break; 848 sc->sc_swflags = *(int *)data; 849 break; 850 851 case TIOCMSET: 852 case TIOCMBIS: 853 case TIOCMBIC: 854 tiocm_to_sscom(sc, cmd, *(int *)data); 855 break; 856 857 case TIOCMGET: 858 *(int *)data = sscom_to_tiocm(sc); 859 break; 860 861 default: 862 error = EPASSTHROUGH; 863 break; 864 } 865 866 SSCOM_UNLOCK(sc); 867 splx(s); 868 869 if (sscom_debug) 870 sscomstatus(sc, "sscomioctl "); 871 872 return error; 873 } 874 875 integrate void 876 sscom_schedrx(struct sscom_softc *sc) 877 { 878 879 sc->sc_rx_ready = 1; 880 881 /* Wake up the poller. */ 882 softint_schedule(sc->sc_si); 883 } 884 885 static void 886 sscom_break(struct sscom_softc *sc, int onoff) 887 { 888 889 if (onoff) 890 SET(sc->sc_ucon, UCON_SBREAK); 891 else 892 CLR(sc->sc_ucon, UCON_SBREAK); 893 894 if (!sc->sc_heldchange) { 895 if (sc->sc_tx_busy) { 896 sc->sc_heldtbc = sc->sc_tbc; 897 sc->sc_tbc = 0; 898 sc->sc_heldchange = 1; 899 } else 900 sscom_loadchannelregs(sc); 901 } 902 } 903 904 static void 905 sscom_modem(struct sscom_softc *sc, int onoff) 906 { 907 if (onoff) 908 SET(sc->sc_umcon, UMCON_DTR); 909 else 910 CLR(sc->sc_umcon, UMCON_DTR); 911 912 if (!sc->sc_heldchange) { 913 if (sc->sc_tx_busy) { 914 sc->sc_heldtbc = sc->sc_tbc; 915 sc->sc_tbc = 0; 916 sc->sc_heldchange = 1; 917 } else 918 sscom_loadchannelregs(sc); 919 } 920 } 921 922 static void 923 tiocm_to_sscom(struct sscom_softc *sc, u_long how, int ttybits) 924 { 925 u_char sscombits; 926 927 sscombits = 0; 928 if (ISSET(ttybits, TIOCM_DTR)) 929 sscombits = UMCON_DTR; 930 if (ISSET(ttybits, TIOCM_RTS)) 931 SET(sscombits, UMCON_RTS); 932 933 switch (how) { 934 case TIOCMBIC: 935 CLR(sc->sc_umcon, sscombits); 936 break; 937 938 case TIOCMBIS: 939 SET(sc->sc_umcon, sscombits); 940 break; 941 942 case TIOCMSET: 943 CLR(sc->sc_umcon, UMCON_DTR); 944 SET(sc->sc_umcon, sscombits); 945 break; 946 } 947 948 if (!sc->sc_heldchange) { 949 if (sc->sc_tx_busy) { 950 sc->sc_heldtbc = sc->sc_tbc; 951 sc->sc_tbc = 0; 952 sc->sc_heldchange = 1; 953 } else 954 sscom_loadchannelregs(sc); 955 } 956 } 957 958 static int 959 sscom_to_tiocm(struct sscom_softc *sc) 960 { 961 u_char sscombits; 962 int ttybits = 0; 963 964 sscombits = sc->sc_umcon; 965 #if 0 966 if (ISSET(sscombits, MCR_DTR)) 967 SET(ttybits, TIOCM_DTR); 968 #endif 969 if (ISSET(sscombits, UMCON_RTS)) 970 SET(ttybits, TIOCM_RTS); 971 972 sscombits = sc->sc_msts; 973 if (ISSET(sscombits, MSTS_DCD)) 974 SET(ttybits, TIOCM_CD); 975 if (ISSET(sscombits, MSTS_DSR)) 976 SET(ttybits, TIOCM_DSR); 977 if (ISSET(sscombits, MSTS_CTS)) 978 SET(ttybits, TIOCM_CTS); 979 980 if (sc->sc_ucon != 0) 981 SET(ttybits, TIOCM_LE); 982 983 return ttybits; 984 } 985 986 static int 987 cflag2lcr(tcflag_t cflag) 988 { 989 u_char lcr = ULCON_PARITY_NONE; 990 991 switch (cflag & (PARENB|PARODD)) { 992 case PARENB|PARODD: lcr = ULCON_PARITY_ODD; break; 993 case PARENB: lcr = ULCON_PARITY_EVEN; 994 } 995 996 switch (ISSET(cflag, CSIZE)) { 997 case CS5: 998 SET(lcr, ULCON_LENGTH_5); 999 break; 1000 case CS6: 1001 SET(lcr, ULCON_LENGTH_6); 1002 break; 1003 case CS7: 1004 SET(lcr, ULCON_LENGTH_7); 1005 break; 1006 case CS8: 1007 SET(lcr, ULCON_LENGTH_8); 1008 break; 1009 } 1010 if (ISSET(cflag, CSTOPB)) 1011 SET(lcr, ULCON_STOP); 1012 1013 return lcr; 1014 } 1015 1016 int 1017 sscomparam(struct tty *tp, struct termios *t) 1018 { 1019 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(tp->t_dev)); 1020 int ospeed; 1021 u_char lcr; 1022 int s; 1023 1024 if (SSCOM_ISALIVE(sc) == 0) 1025 return EIO; 1026 1027 ospeed = sscomspeed(t->c_ospeed, sc->sc_frequency); 1028 1029 /* Check requested parameters. */ 1030 if (ospeed < 0) 1031 return EINVAL; 1032 if (t->c_ispeed && t->c_ispeed != t->c_ospeed) 1033 return EINVAL; 1034 1035 /* 1036 * For the console, always force CLOCAL and !HUPCL, so that the port 1037 * is always active. 1038 */ 1039 if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) || 1040 ISSET(sc->sc_hwflags, SSCOM_HW_CONSOLE)) { 1041 SET(t->c_cflag, CLOCAL); 1042 CLR(t->c_cflag, HUPCL); 1043 } 1044 1045 /* 1046 * If there were no changes, don't do anything. This avoids dropping 1047 * input and improves performance when all we did was frob things like 1048 * VMIN and VTIME. 1049 */ 1050 if (tp->t_ospeed == t->c_ospeed && 1051 tp->t_cflag == t->c_cflag) 1052 return 0; 1053 1054 lcr = cflag2lcr(t->c_cflag); 1055 1056 s = splserial(); 1057 SSCOM_LOCK(sc); 1058 1059 sc->sc_ulcon = lcr; 1060 1061 /* 1062 * If we're not in a mode that assumes a connection is present, then 1063 * ignore carrier changes. 1064 */ 1065 if (ISSET(t->c_cflag, CLOCAL | MDMBUF)) 1066 sc->sc_msr_dcd = 0; 1067 else 1068 sc->sc_msr_dcd = MSTS_DCD; 1069 1070 /* 1071 * Set the flow control pins depending on the current flow control 1072 * mode. 1073 */ 1074 if (ISSET(t->c_cflag, CRTSCTS)) { 1075 sc->sc_mcr_dtr = UMCON_DTR; 1076 sc->sc_mcr_rts = UMCON_RTS; 1077 sc->sc_msr_cts = MSTS_CTS; 1078 } 1079 else if (ISSET(t->c_cflag, MDMBUF)) { 1080 /* 1081 * For DTR/DCD flow control, make sure we don't toggle DTR for 1082 * carrier detection. 1083 */ 1084 sc->sc_mcr_dtr = 0; 1085 sc->sc_mcr_rts = UMCON_DTR; 1086 sc->sc_msr_cts = MSTS_DCD; 1087 } 1088 else { 1089 /* 1090 * If no flow control, then always set RTS. This will make 1091 * the other side happy if it mistakenly thinks we're doing 1092 * RTS/CTS flow control. 1093 */ 1094 sc->sc_mcr_dtr = UMCON_DTR | UMCON_RTS; 1095 sc->sc_mcr_rts = 0; 1096 sc->sc_msr_cts = 0; 1097 if (ISSET(sc->sc_umcon, UMCON_DTR)) 1098 SET(sc->sc_umcon, UMCON_RTS); 1099 else 1100 CLR(sc->sc_umcon, UMCON_RTS); 1101 } 1102 sc->sc_msr_mask = sc->sc_msr_cts | sc->sc_msr_dcd; 1103 1104 if (ospeed == 0) 1105 CLR(sc->sc_umcon, sc->sc_mcr_dtr); 1106 else 1107 SET(sc->sc_umcon, sc->sc_mcr_dtr); 1108 1109 sc->sc_ubrdiv = ospeed; 1110 1111 /* And copy to tty. */ 1112 tp->t_ispeed = 0; 1113 tp->t_ospeed = t->c_ospeed; 1114 tp->t_cflag = t->c_cflag; 1115 1116 if (!sc->sc_heldchange) { 1117 if (sc->sc_tx_busy) { 1118 sc->sc_heldtbc = sc->sc_tbc; 1119 sc->sc_tbc = 0; 1120 sc->sc_heldchange = 1; 1121 } else 1122 sscom_loadchannelregs(sc); 1123 } 1124 1125 if (!ISSET(t->c_cflag, CHWFLOW)) { 1126 /* Disable the high water mark. */ 1127 sc->sc_r_hiwat = 0; 1128 sc->sc_r_lowat = 0; 1129 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1130 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1131 sscom_schedrx(sc); 1132 } 1133 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 1134 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 1135 sscom_hwiflow(sc); 1136 } 1137 } else { 1138 sc->sc_r_hiwat = sscom_rbuf_hiwat; 1139 sc->sc_r_lowat = sscom_rbuf_lowat; 1140 } 1141 1142 SSCOM_UNLOCK(sc); 1143 splx(s); 1144 1145 /* 1146 * Update the tty layer's idea of the carrier bit, in case we changed 1147 * CLOCAL or MDMBUF. We don't hang up here; we only do that by 1148 * explicit request. 1149 */ 1150 (void) (*tp->t_linesw->l_modem)(tp, ISSET(sc->sc_msts, MSTS_DCD)); 1151 1152 if (sscom_debug) 1153 sscomstatus(sc, "sscomparam "); 1154 1155 if (!ISSET(t->c_cflag, CHWFLOW)) { 1156 if (sc->sc_tx_stopped) { 1157 sc->sc_tx_stopped = 0; 1158 sscomstart(tp); 1159 } 1160 } 1161 1162 return 0; 1163 } 1164 1165 static void 1166 sscom_iflush(struct sscom_softc *sc) 1167 { 1168 bus_space_tag_t iot = sc->sc_iot; 1169 bus_space_handle_t ioh = sc->sc_ioh; 1170 int timo; 1171 1172 1173 timo = 50000; 1174 /* flush any pending I/O */ 1175 while ( sscom_rxrdy(iot, ioh) && --timo) 1176 (void)sscom_getc(iot,ioh); 1177 #ifdef DIAGNOSTIC 1178 if (!timo) 1179 printf("%s: sscom_iflush timeout\n", sc->sc_dev->dv_xname); 1180 #endif 1181 } 1182 1183 static void 1184 sscom_loadchannelregs(struct sscom_softc *sc) 1185 { 1186 bus_space_tag_t iot = sc->sc_iot; 1187 bus_space_handle_t ioh = sc->sc_ioh; 1188 1189 /* XXXXX necessary? */ 1190 sscom_iflush(sc); 1191 1192 bus_space_write_2(iot, ioh, SSCOM_UCON, 0); 1193 1194 #if 0 1195 if (ISSET(sc->sc_hwflags, COM_HW_FLOW)) { 1196 bus_space_write_1(iot, ioh, com_lcr, LCR_EERS); 1197 bus_space_write_1(iot, ioh, com_efr, sc->sc_efr); 1198 } 1199 #endif 1200 1201 bus_space_write_2(iot, ioh, SSCOM_UBRDIV, sc->sc_ubrdiv); 1202 bus_space_write_1(iot, ioh, SSCOM_ULCON, sc->sc_ulcon); 1203 sc->set_modem_control(sc); 1204 bus_space_write_2(iot, ioh, SSCOM_UCON, sc->sc_ucon); 1205 } 1206 1207 static int 1208 sscomhwiflow(struct tty *tp, int block) 1209 { 1210 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(tp->t_dev)); 1211 int s; 1212 1213 if (SSCOM_ISALIVE(sc) == 0) 1214 return 0; 1215 1216 if (sc->sc_mcr_rts == 0) 1217 return 0; 1218 1219 s = splserial(); 1220 SSCOM_LOCK(sc); 1221 1222 if (block) { 1223 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1224 SET(sc->sc_rx_flags, RX_TTY_BLOCKED); 1225 sscom_hwiflow(sc); 1226 } 1227 } else { 1228 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1229 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1230 sscom_schedrx(sc); 1231 } 1232 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1233 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED); 1234 sscom_hwiflow(sc); 1235 } 1236 } 1237 1238 SSCOM_UNLOCK(sc); 1239 splx(s); 1240 return 1; 1241 } 1242 1243 /* 1244 * (un)block input via hw flowcontrol 1245 */ 1246 static void 1247 sscom_hwiflow(struct sscom_softc *sc) 1248 { 1249 if (sc->sc_mcr_rts == 0) 1250 return; 1251 1252 if (ISSET(sc->sc_rx_flags, RX_ANY_BLOCK)) { 1253 CLR(sc->sc_umcon, sc->sc_mcr_rts); 1254 CLR(sc->sc_mcr_active, sc->sc_mcr_rts); 1255 } else { 1256 SET(sc->sc_umcon, sc->sc_mcr_rts); 1257 SET(sc->sc_mcr_active, sc->sc_mcr_rts); 1258 } 1259 sc->set_modem_control(sc); 1260 } 1261 1262 1263 void 1264 sscomstart(struct tty *tp) 1265 { 1266 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(tp->t_dev)); 1267 int s; 1268 1269 if (SSCOM_ISALIVE(sc) == 0) 1270 return; 1271 1272 s = spltty(); 1273 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 1274 goto out; 1275 if (sc->sc_tx_stopped) 1276 goto out; 1277 if (!ttypull(tp)) 1278 goto out; 1279 1280 /* Grab the first contiguous region of buffer space. */ 1281 { 1282 u_char *tba; 1283 int tbc; 1284 1285 tba = tp->t_outq.c_cf; 1286 tbc = ndqb(&tp->t_outq, 0); 1287 1288 (void)splserial(); 1289 SSCOM_LOCK(sc); 1290 1291 sc->sc_tba = tba; 1292 sc->sc_tbc = tbc; 1293 } 1294 1295 SET(tp->t_state, TS_BUSY); 1296 sc->sc_tx_busy = 1; 1297 1298 /* Output the first chunk of the contiguous buffer. */ 1299 sscom_output_chunk(sc); 1300 1301 /* Enable transmit completion interrupts if necessary. */ 1302 if ((sc->sc_hwflags & SSCOM_HW_TXINT) == 0) 1303 sscom_enable_txint(sc); 1304 1305 SSCOM_UNLOCK(sc); 1306 out: 1307 splx(s); 1308 return; 1309 } 1310 1311 /* 1312 * Stop output on a line. 1313 */ 1314 void 1315 sscomstop(struct tty *tp, int flag) 1316 { 1317 struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(tp->t_dev)); 1318 int s; 1319 1320 s = splserial(); 1321 SSCOM_LOCK(sc); 1322 if (ISSET(tp->t_state, TS_BUSY)) { 1323 /* Stop transmitting at the next chunk. */ 1324 sc->sc_tbc = 0; 1325 sc->sc_heldtbc = 0; 1326 if (!ISSET(tp->t_state, TS_TTSTOP)) 1327 SET(tp->t_state, TS_FLUSH); 1328 } 1329 SSCOM_UNLOCK(sc); 1330 splx(s); 1331 } 1332 1333 void 1334 sscomdiag(void *arg) 1335 { 1336 struct sscom_softc *sc = arg; 1337 int overflows, floods; 1338 int s; 1339 1340 s = splserial(); 1341 SSCOM_LOCK(sc); 1342 overflows = sc->sc_overflows; 1343 sc->sc_overflows = 0; 1344 floods = sc->sc_floods; 1345 sc->sc_floods = 0; 1346 sc->sc_errors = 0; 1347 SSCOM_UNLOCK(sc); 1348 splx(s); 1349 1350 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1351 sc->sc_dev->dv_xname, 1352 overflows, overflows == 1 ? "" : "s", 1353 floods, floods == 1 ? "" : "s"); 1354 } 1355 1356 integrate void 1357 sscom_rxsoft(struct sscom_softc *sc, struct tty *tp) 1358 { 1359 int (*rint) (int, struct tty *) = tp->t_linesw->l_rint; 1360 u_char *get, *end; 1361 u_int cc, scc; 1362 u_char rsr; 1363 int code; 1364 int s; 1365 1366 end = sc->sc_ebuf; 1367 get = sc->sc_rbget; 1368 scc = cc = sscom_rbuf_size - sc->sc_rbavail; 1369 1370 if (cc == sscom_rbuf_size) { 1371 sc->sc_floods++; 1372 if (sc->sc_errors++ == 0) 1373 callout_reset(&sc->sc_diag_callout, 60 * hz, 1374 sscomdiag, sc); 1375 } 1376 1377 while (cc) { 1378 code = get[0]; 1379 rsr = get[1]; 1380 if (rsr) { 1381 if (ISSET(rsr, UERSTAT_OVERRUN)) { 1382 sc->sc_overflows++; 1383 if (sc->sc_errors++ == 0) 1384 callout_reset(&sc->sc_diag_callout, 1385 60 * hz, sscomdiag, sc); 1386 } 1387 if (ISSET(rsr, UERSTAT_BREAK | UERSTAT_FRAME)) 1388 SET(code, TTY_FE); 1389 if (ISSET(rsr, UERSTAT_PARITY)) 1390 SET(code, TTY_PE); 1391 } 1392 if ((*rint)(code, tp) == -1) { 1393 /* 1394 * The line discipline's buffer is out of space. 1395 */ 1396 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1397 /* 1398 * We're either not using flow control, or the 1399 * line discipline didn't tell us to block for 1400 * some reason. Either way, we have no way to 1401 * know when there's more space available, so 1402 * just drop the rest of the data. 1403 */ 1404 get += cc << 1; 1405 if (get >= end) 1406 get -= sscom_rbuf_size << 1; 1407 cc = 0; 1408 } else { 1409 /* 1410 * Don't schedule any more receive processing 1411 * until the line discipline tells us there's 1412 * space available (through sscomhwiflow()). 1413 * Leave the rest of the data in the input 1414 * buffer. 1415 */ 1416 SET(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1417 } 1418 break; 1419 } 1420 get += 2; 1421 if (get >= end) 1422 get = sc->sc_rbuf; 1423 cc--; 1424 } 1425 1426 if (cc != scc) { 1427 sc->sc_rbget = get; 1428 s = splserial(); 1429 SSCOM_LOCK(sc); 1430 1431 cc = sc->sc_rbavail += scc - cc; 1432 /* Buffers should be ok again, release possible block. */ 1433 if (cc >= sc->sc_r_lowat) { 1434 if (ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1435 CLR(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1436 sscom_enable_rxint(sc); 1437 sc->sc_ucon |= UCON_ERRINT; 1438 bus_space_write_2(sc->sc_iot, sc->sc_ioh, SSCOM_UCON, 1439 sc->sc_ucon); 1440 1441 } 1442 if (ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED)) { 1443 CLR(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1444 sscom_hwiflow(sc); 1445 } 1446 } 1447 SSCOM_UNLOCK(sc); 1448 splx(s); 1449 } 1450 } 1451 1452 integrate void 1453 sscom_txsoft(struct sscom_softc *sc, struct tty *tp) 1454 { 1455 1456 CLR(tp->t_state, TS_BUSY); 1457 if (ISSET(tp->t_state, TS_FLUSH)) 1458 CLR(tp->t_state, TS_FLUSH); 1459 else 1460 ndflush(&tp->t_outq, (int)(sc->sc_tba - tp->t_outq.c_cf)); 1461 (*tp->t_linesw->l_start)(tp); 1462 } 1463 1464 integrate void 1465 sscom_stsoft(struct sscom_softc *sc, struct tty *tp) 1466 { 1467 u_char msr, delta; 1468 int s; 1469 1470 s = splserial(); 1471 SSCOM_LOCK(sc); 1472 msr = sc->sc_msts; 1473 delta = sc->sc_msr_delta; 1474 sc->sc_msr_delta = 0; 1475 SSCOM_UNLOCK(sc); 1476 splx(s); 1477 1478 if (ISSET(delta, sc->sc_msr_dcd)) { 1479 /* 1480 * Inform the tty layer that carrier detect changed. 1481 */ 1482 (void) (*tp->t_linesw->l_modem)(tp, ISSET(msr, MSTS_DCD)); 1483 } 1484 1485 if (ISSET(delta, sc->sc_msr_cts)) { 1486 /* Block or unblock output according to flow control. */ 1487 if (ISSET(msr, sc->sc_msr_cts)) { 1488 sc->sc_tx_stopped = 0; 1489 (*tp->t_linesw->l_start)(tp); 1490 } else { 1491 sc->sc_tx_stopped = 1; 1492 } 1493 } 1494 1495 if (sscom_debug) 1496 sscomstatus(sc, "sscom_stsoft"); 1497 } 1498 1499 void 1500 sscomsoft(void *arg) 1501 { 1502 struct sscom_softc *sc = arg; 1503 struct tty *tp; 1504 1505 if (SSCOM_ISALIVE(sc) == 0) 1506 return; 1507 1508 { 1509 tp = sc->sc_tty; 1510 1511 if (sc->sc_rx_ready) { 1512 sc->sc_rx_ready = 0; 1513 sscom_rxsoft(sc, tp); 1514 } 1515 1516 if (sc->sc_st_check) { 1517 sc->sc_st_check = 0; 1518 sscom_stsoft(sc, tp); 1519 } 1520 1521 if (sc->sc_tx_done) { 1522 sc->sc_tx_done = 0; 1523 sscom_txsoft(sc, tp); 1524 } 1525 } 1526 } 1527 1528 1529 int 1530 sscomrxintr(void *arg) 1531 { 1532 struct sscom_softc *sc = arg; 1533 bus_space_tag_t iot = sc->sc_iot; 1534 bus_space_handle_t ioh = sc->sc_ioh; 1535 u_char *put, *end; 1536 u_int cc; 1537 1538 if (SSCOM_ISALIVE(sc) == 0) 1539 return 0; 1540 1541 SSCOM_LOCK(sc); 1542 1543 end = sc->sc_ebuf; 1544 put = sc->sc_rbput; 1545 cc = sc->sc_rbavail; 1546 1547 do { 1548 u_char msts, delta; 1549 u_char uerstat; 1550 uint16_t ufstat; 1551 1552 ufstat = bus_space_read_2(iot, ioh, SSCOM_UFSTAT); 1553 1554 /* XXX: break interrupt with no character? */ 1555 1556 if ( (ufstat & (UFSTAT_RXCOUNT|UFSTAT_RXFULL)) && 1557 !ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1558 1559 while (cc > 0) { 1560 int cn_trapped = 0; 1561 1562 /* get status and received character. 1563 read status register first */ 1564 uerstat = sscom_geterr(iot, ioh); 1565 put[0] = sscom_getc(iot, ioh); 1566 1567 if (ISSET(uerstat, UERSTAT_BREAK)) { 1568 int con_trapped = 0; 1569 cn_check_magic(sc->sc_tty->t_dev, 1570 CNC_BREAK, sscom_cnm_state); 1571 if (con_trapped) 1572 continue; 1573 #if defined(KGDB) 1574 if (ISSET(sc->sc_hwflags, 1575 SSCOM_HW_KGDB)) { 1576 kgdb_connect(1); 1577 continue; 1578 } 1579 #endif 1580 } 1581 1582 put[1] = uerstat; 1583 cn_check_magic(sc->sc_tty->t_dev, 1584 put[0], sscom_cnm_state); 1585 if (!cn_trapped) { 1586 put += 2; 1587 if (put >= end) 1588 put = sc->sc_rbuf; 1589 cc--; 1590 } 1591 1592 ufstat = bus_space_read_2(iot, ioh, SSCOM_UFSTAT); 1593 if ( (ufstat & (UFSTAT_RXFULL|UFSTAT_RXCOUNT)) == 0 ) 1594 break; 1595 } 1596 1597 /* 1598 * Current string of incoming characters ended because 1599 * no more data was available or we ran out of space. 1600 * Schedule a receive event if any data was received. 1601 * If we're out of space, turn off receive interrupts. 1602 */ 1603 sc->sc_rbput = put; 1604 sc->sc_rbavail = cc; 1605 if (!ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) 1606 sc->sc_rx_ready = 1; 1607 1608 /* 1609 * See if we are in danger of overflowing a buffer. If 1610 * so, use hardware flow control to ease the pressure. 1611 */ 1612 if (!ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED) && 1613 cc < sc->sc_r_hiwat) { 1614 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1615 sscom_hwiflow(sc); 1616 } 1617 1618 /* 1619 * If we're out of space, disable receive interrupts 1620 * until the queue has drained a bit. 1621 */ 1622 if (!cc) { 1623 SET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1624 sscom_disable_rxint(sc); 1625 sc->sc_ucon &= ~UCON_ERRINT; 1626 bus_space_write_2(iot, ioh, SSCOM_UCON, sc->sc_ucon); 1627 } 1628 } 1629 1630 1631 msts = sc->read_modem_status(sc); 1632 delta = msts ^ sc->sc_msts; 1633 sc->sc_msts = msts; 1634 1635 #ifdef notyet 1636 /* 1637 * Pulse-per-second (PSS) signals on edge of DCD? 1638 * Process these even if line discipline is ignoring DCD. 1639 */ 1640 if (delta & sc->sc_ppsmask) { 1641 struct timeval tv; 1642 if ((msr & sc->sc_ppsmask) == sc->sc_ppsassert) { 1643 /* XXX nanotime() */ 1644 microtime(&tv); 1645 TIMEVAL_TO_TIMESPEC(&tv, 1646 &sc->ppsinfo.assert_timestamp); 1647 if (sc->ppsparam.mode & PPS_OFFSETASSERT) { 1648 timespecadd(&sc->ppsinfo.assert_timestamp, 1649 &sc->ppsparam.assert_offset, 1650 &sc->ppsinfo.assert_timestamp); 1651 } 1652 1653 #ifdef PPS_SYNC 1654 if (sc->ppsparam.mode & PPS_HARDPPSONASSERT) 1655 hardpps(&tv, tv.tv_usec); 1656 #endif 1657 sc->ppsinfo.assert_sequence++; 1658 sc->ppsinfo.current_mode = sc->ppsparam.mode; 1659 1660 } else if ((msr & sc->sc_ppsmask) == sc->sc_ppsclear) { 1661 /* XXX nanotime() */ 1662 microtime(&tv); 1663 TIMEVAL_TO_TIMESPEC(&tv, 1664 &sc->ppsinfo.clear_timestamp); 1665 if (sc->ppsparam.mode & PPS_OFFSETCLEAR) { 1666 timespecadd(&sc->ppsinfo.clear_timestamp, 1667 &sc->ppsparam.clear_offset, 1668 &sc->ppsinfo.clear_timestamp); 1669 } 1670 1671 #ifdef PPS_SYNC 1672 if (sc->ppsparam.mode & PPS_HARDPPSONCLEAR) 1673 hardpps(&tv, tv.tv_usec); 1674 #endif 1675 sc->ppsinfo.clear_sequence++; 1676 sc->ppsinfo.current_mode = sc->ppsparam.mode; 1677 } 1678 } 1679 #endif 1680 1681 /* 1682 * Process normal status changes 1683 */ 1684 if (ISSET(delta, sc->sc_msr_mask)) { 1685 SET(sc->sc_msr_delta, delta); 1686 1687 /* 1688 * Stop output immediately if we lose the output 1689 * flow control signal or carrier detect. 1690 */ 1691 if (ISSET(~msts, sc->sc_msr_mask)) { 1692 sc->sc_tbc = 0; 1693 sc->sc_heldtbc = 0; 1694 #ifdef SSCOM_DEBUG 1695 if (sscom_debug) 1696 sscomstatus(sc, "sscomintr "); 1697 #endif 1698 } 1699 1700 sc->sc_st_check = 1; 1701 } 1702 1703 /* 1704 * Done handling any receive interrupts. 1705 */ 1706 1707 /* 1708 * If we've delayed a parameter change, do it 1709 * now, and restart * output. 1710 */ 1711 if ((ufstat & UFSTAT_TXCOUNT) == 0) { 1712 /* XXX: we should check transmitter empty also */ 1713 1714 if (sc->sc_heldchange) { 1715 sscom_loadchannelregs(sc); 1716 sc->sc_heldchange = 0; 1717 sc->sc_tbc = sc->sc_heldtbc; 1718 sc->sc_heldtbc = 0; 1719 } 1720 } 1721 1722 1723 } while (0); 1724 1725 SSCOM_UNLOCK(sc); 1726 1727 /* Wake up the poller. */ 1728 softint_schedule(sc->sc_si); 1729 1730 #ifdef RND_COM 1731 rnd_add_uint32(&sc->rnd_source, iir | rsr); 1732 #endif 1733 1734 return 1; 1735 } 1736 1737 int 1738 sscomtxintr(void *arg) 1739 { 1740 struct sscom_softc *sc = arg; 1741 bus_space_tag_t iot = sc->sc_iot; 1742 bus_space_handle_t ioh = sc->sc_ioh; 1743 uint16_t ufstat; 1744 1745 if (SSCOM_ISALIVE(sc) == 0) 1746 return 0; 1747 1748 SSCOM_LOCK(sc); 1749 1750 ufstat = bus_space_read_2(iot, ioh, SSCOM_UFSTAT); 1751 1752 /* 1753 * If we've delayed a parameter change, do it 1754 * now, and restart * output. 1755 */ 1756 if (sc->sc_heldchange && (ufstat & UFSTAT_TXCOUNT) == 0) { 1757 /* XXX: we should check transmitter empty also */ 1758 sscom_loadchannelregs(sc); 1759 sc->sc_heldchange = 0; 1760 sc->sc_tbc = sc->sc_heldtbc; 1761 sc->sc_heldtbc = 0; 1762 } 1763 1764 /* 1765 * See if data can be transmitted as well. Schedule tx 1766 * done event if no data left and tty was marked busy. 1767 */ 1768 if (!ISSET(ufstat,UFSTAT_TXFULL)) { 1769 /* 1770 * Output the next chunk of the contiguous 1771 * buffer, if any. 1772 */ 1773 if (sc->sc_tbc > 0) { 1774 __sscom_output_chunk(sc, ufstat); 1775 } 1776 else { 1777 /* 1778 * Disable transmit sscompletion 1779 * interrupts if necessary. 1780 */ 1781 if (sc->sc_hwflags & SSCOM_HW_TXINT) 1782 sscom_disable_txint(sc); 1783 if (sc->sc_tx_busy) { 1784 sc->sc_tx_busy = 0; 1785 sc->sc_tx_done = 1; 1786 } 1787 } 1788 } 1789 1790 SSCOM_UNLOCK(sc); 1791 1792 /* Wake up the poller. */ 1793 softint_schedule(sc->sc_si); 1794 1795 #ifdef RND_COM 1796 rnd_add_uint32(&sc->rnd_source, iir | rsr); 1797 #endif 1798 1799 return 1; 1800 } 1801 1802 1803 #if defined(KGDB) || defined(SSCOM0CONSOLE) || defined(SSCOM1CONSOLE) 1804 /* 1805 * Initialize UART for use as console or KGDB line. 1806 */ 1807 static int 1808 sscom_init(bus_space_tag_t iot, const struct sscom_uart_info *config, 1809 int rate, int frequency, tcflag_t cflag, bus_space_handle_t *iohp) 1810 { 1811 bus_space_handle_t ioh; 1812 bus_addr_t iobase = config->iobase; 1813 1814 if (bus_space_map(iot, iobase, SSCOM_SIZE, 0, &ioh)) 1815 return ENOMEM; /* ??? */ 1816 1817 bus_space_write_2(iot, ioh, SSCOM_UCON, 0); 1818 bus_space_write_1(iot, ioh, SSCOM_UFCON, 1819 #ifdef SSCOM_S3C2440 1820 UFCON_TXTRIGGER_16 | UFCON_RXTRIGGER_16 | 1821 #else 1822 UFCON_TXTRIGGER_8 | UFCON_RXTRIGGER_8 | 1823 #endif 1824 UFCON_TXFIFO_RESET | UFCON_RXFIFO_RESET | 1825 UFCON_FIFO_ENABLE ); 1826 /* tx/rx fifo reset are auto-cleared */ 1827 1828 rate = sscomspeed(rate, frequency); 1829 bus_space_write_2(iot, ioh, SSCOM_UBRDIV, rate); 1830 bus_space_write_2(iot, ioh, SSCOM_ULCON, cflag2lcr(cflag)); 1831 1832 /* enable UART */ 1833 bus_space_write_2(iot, ioh, SSCOM_UCON, 1834 UCON_TXMODE_INT|UCON_RXMODE_INT); 1835 bus_space_write_2(iot, ioh, SSCOM_UMCON, UMCON_RTS); 1836 1837 *iohp = ioh; 1838 return 0; 1839 } 1840 1841 #endif 1842 1843 #if defined(SSCOM0CONSOLE) || defined(SSCOM1CONSOLE) 1844 /* 1845 * Following are all routines needed for SSCOM to act as console 1846 */ 1847 struct consdev sscomcons = { 1848 NULL, NULL, sscomcngetc, sscomcnputc, sscomcnpollc, NULL, 1849 NULL, NULL, NODEV, CN_NORMAL 1850 }; 1851 1852 1853 int 1854 sscom_cnattach(bus_space_tag_t iot, const struct sscom_uart_info *config, 1855 int rate, int frequency, tcflag_t cflag) 1856 { 1857 int res; 1858 1859 res = sscom_init(iot, config, rate, frequency, cflag, &sscomconsioh); 1860 if (res) 1861 return res; 1862 1863 cn_tab = &sscomcons; 1864 cn_init_magic(&sscom_cnm_state); 1865 cn_set_magic("\047\001"); /* default magic is BREAK */ 1866 1867 sscomconstag = iot; 1868 sscomconsunit = config->unit; 1869 sscomconsrate = rate; 1870 sscomconscflag = cflag; 1871 1872 return 0; 1873 } 1874 1875 void 1876 sscom_cndetach(void) 1877 { 1878 bus_space_unmap(sscomconstag, sscomconsioh, SSCOM_SIZE); 1879 sscomconstag = NULL; 1880 1881 cn_tab = NULL; 1882 } 1883 1884 /* 1885 * The read-ahead code is so that you can detect pending in-band 1886 * cn_magic in polled mode while doing output rather than having to 1887 * wait until the kernel decides it needs input. 1888 */ 1889 1890 #define MAX_READAHEAD 20 1891 static int sscom_readahead[MAX_READAHEAD]; 1892 static int sscom_readaheadcount = 0; 1893 1894 int 1895 sscomcngetc(dev_t dev) 1896 { 1897 int s = splserial(); 1898 u_char stat, c; 1899 1900 /* got a character from reading things earlier */ 1901 if (sscom_readaheadcount > 0) { 1902 int i; 1903 1904 c = sscom_readahead[0]; 1905 for (i = 1; i < sscom_readaheadcount; i++) { 1906 sscom_readahead[i-1] = sscom_readahead[i]; 1907 } 1908 sscom_readaheadcount--; 1909 splx(s); 1910 return c; 1911 } 1912 1913 /* block until a character becomes available */ 1914 while (!sscom_rxrdy(sscomconstag, sscomconsioh)) 1915 ; 1916 1917 c = sscom_getc(sscomconstag, sscomconsioh); 1918 stat = sscom_geterr(sscomconstag, sscomconsioh); 1919 { 1920 int cn_trapped = 0; /* unused */ 1921 #ifdef DDB 1922 extern int db_active; 1923 if (!db_active) 1924 #endif 1925 cn_check_magic(dev, c, sscom_cnm_state); 1926 } 1927 splx(s); 1928 return c; 1929 } 1930 1931 /* 1932 * Console kernel output character routine. 1933 */ 1934 void 1935 sscomcnputc(dev_t dev, int c) 1936 { 1937 int s = splserial(); 1938 int timo; 1939 1940 int cin, stat; 1941 if (sscom_readaheadcount < MAX_READAHEAD && 1942 sscom_rxrdy(sscomconstag, sscomconsioh)) { 1943 1944 int cn_trapped = 0; 1945 cin = sscom_getc(sscomconstag, sscomconsioh); 1946 stat = sscom_geterr(sscomconstag, sscomconsioh); 1947 cn_check_magic(dev, cin, sscom_cnm_state); 1948 sscom_readahead[sscom_readaheadcount++] = cin; 1949 } 1950 1951 /* wait for any pending transmission to finish */ 1952 timo = 150000; 1953 while (ISSET(bus_space_read_2(sscomconstag, sscomconsioh, SSCOM_UFSTAT), 1954 UFSTAT_TXFULL) && --timo) 1955 continue; 1956 1957 bus_space_write_1(sscomconstag, sscomconsioh, SSCOM_UTXH, c); 1958 SSCOM_BARRIER(sscomconstag, sscomconsioh, BR | BW); 1959 1960 #if 0 1961 /* wait for this transmission to complete */ 1962 timo = 1500000; 1963 while (!ISSET(bus_space_read_1(sscomconstag, sscomconsioh, SSCOM_UTRSTAT), 1964 UTRSTAT_TXEMPTY) && --timo) 1965 continue; 1966 #endif 1967 splx(s); 1968 } 1969 1970 void 1971 sscomcnpollc(dev_t dev, int on) 1972 { 1973 1974 } 1975 1976 #endif /* SSCOM0CONSOLE||SSCOM1CONSOLE */ 1977 1978 #ifdef KGDB 1979 int 1980 sscom_kgdb_attach(bus_space_tag_t iot, const struct sscom_uart_info *config, 1981 int rate, int frequency, tcflag_t cflag) 1982 { 1983 int res; 1984 1985 if (iot == sscomconstag && config->unit == sscomconsunit) { 1986 printf( "console==kgdb_port (%d): kgdb disabled\n", sscomconsunit); 1987 return EBUSY; /* cannot share with console */ 1988 } 1989 1990 res = sscom_init(iot, config, rate, frequency, cflag, &sscom_kgdb_ioh); 1991 if (res) 1992 return res; 1993 1994 kgdb_attach(sscom_kgdb_getc, sscom_kgdb_putc, NULL); 1995 kgdb_dev = 123; /* unneeded, only to satisfy some tests */ 1996 1997 sscom_kgdb_iot = iot; 1998 sscom_kgdb_unit = config->unit; 1999 2000 return 0; 2001 } 2002 2003 /* ARGSUSED */ 2004 int 2005 sscom_kgdb_getc(void *arg) 2006 { 2007 int c, stat; 2008 2009 /* block until a character becomes available */ 2010 while (!sscom_rxrdy(sscom_kgdb_iot, sscom_kgdb_ioh)) 2011 ; 2012 2013 c = sscom_getc(sscom_kgdb_iot, sscom_kgdb_ioh); 2014 stat = sscom_geterr(sscom_kgdb_iot, sscom_kgdb_ioh); 2015 2016 return c; 2017 } 2018 2019 /* ARGSUSED */ 2020 void 2021 sscom_kgdb_putc(void *arg, int c) 2022 { 2023 int timo; 2024 2025 /* wait for any pending transmission to finish */ 2026 timo = 150000; 2027 while (ISSET(bus_space_read_2(sscom_kgdb_iot, sscom_kgdb_ioh, 2028 SSCOM_UFSTAT), UFSTAT_TXFULL) && --timo) 2029 continue; 2030 2031 bus_space_write_1(sscom_kgdb_iot, sscom_kgdb_ioh, SSCOM_UTXH, c); 2032 SSCOM_BARRIER(sscom_kgdb_iot, sscom_kgdb_ioh, BR | BW); 2033 2034 #if 0 2035 /* wait for this transmission to complete */ 2036 timo = 1500000; 2037 while (!ISSET(bus_space_read_1(sscom_kgdb_iot, sscom_kgdb_ioh, 2038 SSCOM_UTRSTAT), UTRSTAT_TXEMPTY) && --timo) 2039 continue; 2040 #endif 2041 } 2042 #endif /* KGDB */ 2043 2044 /* helper function to identify the sscom ports used by 2045 console or KGDB (and not yet autoconf attached) */ 2046 int 2047 sscom_is_console(bus_space_tag_t iot, int unit, 2048 bus_space_handle_t *ioh) 2049 { 2050 bus_space_handle_t help; 2051 2052 if (!sscomconsattached && 2053 iot == sscomconstag && unit == sscomconsunit) 2054 help = sscomconsioh; 2055 #ifdef KGDB 2056 else if (!sscom_kgdb_attached && 2057 iot == sscom_kgdb_iot && unit == sscom_kgdb_unit) 2058 help = sscom_kgdb_ioh; 2059 #endif 2060 else 2061 return 0; 2062 2063 if (ioh) 2064 *ioh = help; 2065 return 1; 2066 } 2067
Indexes created Mon Sep 29 21:09:56 GMT 2025