sbscn.c revision 1.37
1 /* $NetBSD: sbscn.c,v 1.37 2012/02/02 19:43:00 tls Exp $ */ 2 3 /* 4 * Copyright 2000, 2001 5 * Broadcom Corporation. All rights reserved. 6 * 7 * This software is furnished under license and may be used and copied only 8 * in accordance with the following terms and conditions. Subject to these 9 * conditions, you may download, copy, install, use, modify and distribute 10 * modified or unmodified copies of this software in source and/or binary 11 * form. No title or ownership is transferred hereby. 12 * 13 * 1) Any source code used, modified or distributed must reproduce and 14 * retain this copyright notice and list of conditions as they appear in 15 * the source file. 16 * 17 * 2) No right is granted to use any trade name, trademark, or logo of 18 * Broadcom Corporation. The "Broadcom Corporation" name may not be 19 * used to endorse or promote products derived from this software 20 * without the prior written permission of Broadcom Corporation. 21 * 22 * 3) THIS SOFTWARE IS PROVIDED "AS-IS" AND ANY EXPRESS OR IMPLIED 23 * WARRANTIES, INCLUDING BUT NOT LIMITED TO, ANY IMPLIED WARRANTIES OF 24 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR 25 * NON-INFRINGEMENT ARE DISCLAIMED. IN NO EVENT SHALL BROADCOM BE LIABLE 26 * FOR ANY DAMAGES WHATSOEVER, AND IN PARTICULAR, BROADCOM SHALL NOT BE 27 * LIABLE FOR DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 30 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 31 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 32 * OR OTHERWISE), EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 /* from: $NetBSD: com.c,v 1.172 2000/05/03 19:19:04 thorpej Exp */ 36 37 /*- 38 * Copyright (c) 1998, 1999 The NetBSD Foundation, Inc. 39 * All rights reserved. 40 * 41 * This code is derived from software contributed to The NetBSD Foundation 42 * by Charles M. Hannum. 43 * 44 * Redistribution and use in source and binary forms, with or without 45 * modification, are permitted provided that the following conditions 46 * are met: 47 * 1. Redistributions of source code must retain the above copyright 48 * notice, this list of conditions and the following disclaimer. 49 * 2. Redistributions in binary form must reproduce the above copyright 50 * notice, this list of conditions and the following disclaimer in the 51 * documentation and/or other materials provided with the distribution. 52 * 53 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 54 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 55 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 56 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 57 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 58 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 59 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 60 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 61 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 62 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 63 * POSSIBILITY OF SUCH DAMAGE. 64 */ 65 66 /* 67 * Copyright (c) 1991 The Regents of the University of California. 68 * All rights reserved. 69 * 70 * Redistribution and use in source and binary forms, with or without 71 * modification, are permitted provided that the following conditions 72 * are met: 73 * 1. Redistributions of source code must retain the above copyright 74 * notice, this list of conditions and the following disclaimer. 75 * 2. Redistributions in binary form must reproduce the above copyright 76 * notice, this list of conditions and the following disclaimer in the 77 * documentation and/or other materials provided with the distribution. 78 * 3. Neither the name of the University nor the names of its contributors 79 * may be used to endorse or promote products derived from this software 80 * without specific prior written permission. 81 * 82 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 83 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 84 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 85 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 86 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 87 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 88 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 89 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 90 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 91 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 92 * SUCH DAMAGE. 93 * 94 * @(#)com.c 7.5 (Berkeley) 5/16/91 95 */ 96 97 /* 98 * `sbscn' driver, supports SiByte SB-1250 SOC DUART. 99 * 100 * This DUART is quite similar in programming model to the scn2681/68681 101 * DUARTs supported by the NetBSD/amiga `mfc' and NetBSD/pc532 `scn' 102 * driver, but substantial rework would have been necessary to make 103 * those drivers sane w.r.t. bus_space (which would then have been 104 * required on NetBSD/sbmips very early on), and to accommodate the 105 * different register mappings. 106 * 107 * So, another driver. Eventually there should be One True Driver, 108 * but we're not here to save the world. 109 */ 110 111 #include <sys/cdefs.h> 112 __KERNEL_RCSID(0, "$NetBSD: sbscn.c,v 1.37 2012/02/02 19:43:00 tls Exp $"); 113 114 #define SBSCN_DEBUG 115 116 #include "opt_ddb.h" 117 #include "ioconf.h" 118 119 #include "rnd.h" 120 #ifdef RND_SBSCN 121 #include <sys/rnd.h> 122 #endif 123 124 #include <sys/param.h> 125 #include <sys/systm.h> 126 #include <sys/ioctl.h> 127 #include <sys/select.h> 128 #include <sys/tty.h> 129 #include <sys/proc.h> 130 #include <sys/conf.h> 131 #include <sys/file.h> 132 #include <sys/uio.h> 133 #include <sys/kernel.h> 134 #include <sys/syslog.h> 135 #include <sys/types.h> 136 #include <sys/device.h> 137 #include <sys/malloc.h> 138 #include <sys/vnode.h> 139 #include <sys/kauth.h> 140 #include <sys/intr.h> 141 142 #include <mips/sibyte/dev/sbobiovar.h> 143 #if 0 144 #include <mips/sibyte/dev/sbscnreg.h> 145 #endif 146 #include <mips/sibyte/dev/sbscnvar.h> 147 #include <dev/cons.h> 148 #include <mips/locore.h> 149 150 void sbscn_attach_channel(struct sbscn_softc *sc, int chan, int intr); 151 #if defined(DDB) || defined(KGDB) 152 static void sbscn_enable_debugport(struct sbscn_channel *ch); 153 #endif 154 void sbscn_config(struct sbscn_channel *ch); 155 void sbscn_shutdown(struct sbscn_channel *ch); 156 int sbscn_speed(long, long *); 157 static int cflag2modes(tcflag_t, u_char *, u_char *); 158 int sbscn_param(struct tty *, struct termios *); 159 void sbscn_start(struct tty *); 160 int sbscn_hwiflow(struct tty *, int); 161 162 void sbscn_loadchannelregs(struct sbscn_channel *); 163 void sbscn_dohwiflow(struct sbscn_channel *); 164 void sbscn_break(struct sbscn_channel *, int); 165 void sbscn_modem(struct sbscn_channel *, int); 166 void tiocm_to_sbscn(struct sbscn_channel *, int, int); 167 int sbscn_to_tiocm(struct sbscn_channel *); 168 void sbscn_iflush(struct sbscn_channel *); 169 170 int sbscn_init(u_long addr, int chan, int rate, tcflag_t cflag); 171 int sbscn_common_getc(u_long addr, int chan); 172 void sbscn_common_putc(u_long addr, int chan, int c); 173 void sbscn_intr(void *arg, uint32_t status, vaddr_t pc); 174 175 int sbscn_cngetc(dev_t dev); 176 void sbscn_cnputc(dev_t dev, int c); 177 void sbscn_cnpollc(dev_t dev, int on); 178 179 dev_type_open(sbscnopen); 180 dev_type_close(sbscnclose); 181 dev_type_read(sbscnread); 182 dev_type_write(sbscnwrite); 183 dev_type_ioctl(sbscnioctl); 184 dev_type_stop(sbscnstop); 185 dev_type_tty(sbscntty); 186 dev_type_poll(sbscnpoll); 187 188 const struct cdevsw sbscn_cdevsw = { 189 sbscnopen, sbscnclose, sbscnread, sbscnwrite, sbscnioctl, 190 sbscnstop, sbscntty, sbscnpoll, nommap, ttykqfilter, D_TTY 191 }; 192 193 #define integrate static inline 194 void sbscn_soft(void *); 195 integrate void sbscn_rxsoft(struct sbscn_channel *, struct tty *); 196 integrate void sbscn_txsoft(struct sbscn_channel *, struct tty *); 197 integrate void sbscn_stsoft(struct sbscn_channel *, struct tty *); 198 integrate void sbscn_schedrx(struct sbscn_channel *); 199 void sbscn_diag(void *); 200 201 /* 202 * Make this an option variable one can patch. 203 * But be warned: this must be a power of 2! 204 */ 205 u_int sbscn_rbuf_size = SBSCN_RING_SIZE; 206 207 /* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */ 208 u_int sbscn_rbuf_hiwat = (SBSCN_RING_SIZE * 1) / 4; 209 u_int sbscn_rbuf_lowat = (SBSCN_RING_SIZE * 3) / 4; 210 211 static int sbscn_cons_present; 212 static int sbscn_cons_attached; 213 static u_long sbscn_cons_addr; 214 static int sbscn_cons_chan; 215 static int sbscn_cons_rate; 216 static tcflag_t sbscn_cons_cflag; 217 218 #ifdef KGDB 219 #include <sys/kgdb.h> 220 221 static int sbscn_kgdb_present; 222 static int sbscn_kgdb_attached; 223 static u_long sbscn_kgdb_addr; 224 static int sbscn_kgdb_chan; 225 226 int sbscn_kgdb_getc(void *); 227 void sbscn_kgdb_putc(void *, int); 228 #endif /* KGDB */ 229 230 static int sbscn_match(device_t, cfdata_t, void *); 231 static void sbscn_attach(device_t, device_t, void *); 232 233 CFATTACH_DECL_NEW(sbscn, sizeof(struct sbscn_softc), 234 sbscn_match, sbscn_attach, NULL, NULL); 235 236 #define READ_REG(rp) (mips3_ld((volatile uint64_t *)(rp))) 237 #define WRITE_REG(rp, val) (mips3_sd((volatile uint64_t *)(rp), (val))) 238 239 /* 240 * input and output signals are actually the _inverse_ of the bits in the 241 * input and output port registers! 242 */ 243 #define GET_INPUT_SIGNALS(ch) \ 244 ((~READ_REG(MIPS_PHYS_TO_KSEG1((ch)->ch_sc->sc_addr + 0x280))) & (ch)->ch_i_mask) 245 #define SET_OUTPUT_SIGNALS(ch, val) \ 246 do { \ 247 int sigs_to_set, sigs_to_clr; \ 248 \ 249 sigs_to_set = (ch)->ch_o_mask & val; \ 250 sigs_to_clr = (ch)->ch_o_mask & ~val; \ 251 \ 252 /* set signals by clearing op bits, and vice versa */ \ 253 WRITE_REG(MIPS_PHYS_TO_KSEG1((ch)->ch_sc->sc_addr + 0x2c0), \ 254 sigs_to_set); \ 255 WRITE_REG(MIPS_PHYS_TO_KSEG1((ch)->ch_sc->sc_addr + 0x2b0), \ 256 sigs_to_clr); \ 257 } while (0) 258 259 static int 260 sbscn_match(device_t parent, cfdata_t match, void *aux) 261 { 262 struct sbobio_attach_args *sa = aux; 263 264 if (sa->sa_locs.sa_type != SBOBIO_DEVTYPE_DUART) 265 return (0); 266 267 return 1; 268 } 269 270 static void 271 sbscn_attach(device_t parent, device_t self, void *aux) 272 { 273 struct sbscn_softc *sc = device_private(self); 274 struct sbobio_attach_args *sa = aux; 275 int i; 276 277 sc->sc_dev = self; 278 sc->sc_addr = sa->sa_base + sa->sa_locs.sa_offset; 279 280 aprint_normal("\n"); 281 for (i = 0; i < 2; i++) 282 sbscn_attach_channel(sc, i, sa->sa_locs.sa_intr[i]); 283 284 /* init duart_opcr */ 285 WRITE_REG(MIPS_PHYS_TO_KSEG1(sc->sc_addr + 0x270), 0); 286 /* init duart_aux_ctrl */ 287 WRITE_REG(MIPS_PHYS_TO_KSEG1(sc->sc_addr + 0x210), 0x0f); /* XXX */ 288 } 289 290 void 291 sbscn_attach_channel(struct sbscn_softc *sc, int chan, int intr) 292 { 293 struct sbscn_channel *ch = &sc->sc_channels[chan]; 294 u_long chan_addr; 295 struct tty *tp; 296 297 ch->ch_sc = sc; 298 ch->ch_num = chan; 299 300 chan_addr = sc->sc_addr + (0x100 * chan); 301 ch->ch_base = (void *)MIPS_PHYS_TO_KSEG1(chan_addr); 302 ch->ch_isr_base = 303 (void *)MIPS_PHYS_TO_KSEG1(sc->sc_addr + 0x220 + (0x20 * chan)); 304 ch->ch_imr_base = 305 (void *)MIPS_PHYS_TO_KSEG1(sc->sc_addr + 0x230 + (0x20 * chan)); 306 #ifdef XXXCGDnotyet 307 ch->ch_inchg_base = 308 (void *)MIPS_PHYS_TO_KSEG1(sc->sc_addr + 0x2d0 + (0x10 * chan)); 309 #endif 310 311 ch->ch_i_dcd = ch->ch_i_dcd_pin = 0 /* XXXCGD */; 312 ch->ch_i_cts = ch->ch_i_cts_pin = 0 /* XXXCGD */; 313 ch->ch_i_dsr = ch->ch_i_dsr_pin = 0 /* XXXCGD */; 314 ch->ch_i_ri = ch->ch_i_ri_pin = 0 /* XXXCGD */; 315 ch->ch_i_mask = 316 ch->ch_i_dcd | ch->ch_i_cts | ch->ch_i_dsr | ch->ch_i_ri; 317 ch->ch_o_dtr = ch->ch_o_dtr_pin = 0 /* XXXCGD */; 318 ch->ch_o_rts = ch->ch_o_rts_pin = 0 /* XXXCGD */; 319 ch->ch_o_mask = ch->ch_o_dtr | ch->ch_o_rts; 320 321 ch->ch_intrhand = cpu_intr_establish(intr, IPL_SERIAL, sbscn_intr, ch); 322 callout_init(&ch->ch_diag_callout, 0); 323 324 /* Disable interrupts before configuring the device. */ 325 ch->ch_imr = 0; 326 WRITE_REG(ch->ch_imr_base, ch->ch_imr); 327 328 if (sbscn_cons_present && 329 sbscn_cons_addr == chan_addr && sbscn_cons_chan == chan) { 330 sbscn_cons_attached = 1; 331 332 /* Make sure the console is always "hardwired". */ 333 delay(1000); /* wait for output to finish */ 334 SET(ch->ch_hwflags, SBSCN_HW_CONSOLE); 335 SET(ch->ch_swflags, TIOCFLAG_SOFTCAR); 336 } 337 338 tp = tty_alloc(); 339 tp->t_oproc = sbscn_start; 340 tp->t_param = sbscn_param; 341 tp->t_hwiflow = sbscn_hwiflow; 342 343 ch->ch_tty = tp; 344 ch->ch_rbuf = malloc(sbscn_rbuf_size << 1, M_DEVBUF, M_NOWAIT); 345 if (ch->ch_rbuf == NULL) { 346 aprint_error_dev(sc->sc_dev, 347 "channel %d: unable to allocate ring buffer\n", 348 chan); 349 return; 350 } 351 ch->ch_ebuf = ch->ch_rbuf + (sbscn_rbuf_size << 1); 352 353 tty_attach(tp); 354 355 if (ISSET(ch->ch_hwflags, SBSCN_HW_CONSOLE)) { 356 int maj; 357 358 /* locate the major number */ 359 maj = cdevsw_lookup_major(&sbscn_cdevsw); 360 361 cn_tab->cn_dev = makedev(maj, 362 (device_unit(sc->sc_dev) << 1) + chan); 363 364 aprint_normal_dev(sc->sc_dev, "channel %d: %s\n", 365 chan, "console"); 366 } 367 368 #ifdef KGDB 369 /* 370 * Allow kgdb to "take over" this port. If this is 371 * the kgdb device, it has exclusive use. 372 */ 373 if (sbscn_kgdb_present && 374 sbscn_kgdb_addr == chan_addr && sbscn_kgdb_chan == chan) { 375 sbscn_kgdb_attached = 1; 376 377 SET(sc->sc_hwflags, SBSCN_HW_KGDB); 378 aprint_normal_dev(sc->sc_dev, "channel %d: %s\n", 379 chan, "kgdb"); 380 } 381 #endif 382 383 ch->ch_si = softint_establish(SOFTINT_SERIAL, sbscn_soft, ch); 384 385 #ifdef RND_SBSCN 386 rnd_attach_source(&ch->ch_rnd_source, device_xname(sc->sc_dev), 387 RND_TYPE_TTY, 0); 388 #endif 389 390 sbscn_config(ch); 391 392 SET(ch->ch_hwflags, SBSCN_HW_DEV_OK); 393 } 394 395 int 396 sbscn_speed(long speed, long *brcp) 397 { 398 #define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */ 399 400 int x, err; 401 int frequency = 100000000; 402 403 *brcp = divrnd(frequency / 20, speed) - 1; 404 405 if (speed <= 0) 406 return (-1); 407 x = divrnd(frequency / 20, speed); 408 if (x <= 0) 409 return (-1); 410 err = divrnd(((quad_t)frequency) * 1000 / 20, speed * x) - 1000; 411 if (err < 0) 412 err = -err; 413 if (err > SBSCN_TOLERANCE) 414 return (-1); 415 *brcp = x - 1; 416 return (0); 417 418 #undef divrnd 419 } 420 421 #ifdef SBSCN_DEBUG 422 void sbscn_status(struct sbscn_channel *, const char *); 423 424 int sbscn_debug = 0 /* XXXCGD */; 425 426 void 427 sbscn_status(struct sbscn_channel *ch, const char *str) 428 { 429 struct sbscn_softc *sc = ch->ch_sc; 430 struct tty *tp = ch->ch_tty; 431 432 aprint_normal_dev(sc->sc_dev, 433 "chan %d: %s %sclocal %sdcd %sts_carr_on %sdtr %stx_stopped\n", 434 ch->ch_num, str, 435 ISSET(tp->t_cflag, CLOCAL) ? "+" : "-", 436 ISSET(ch->ch_iports, ch->ch_i_dcd) ? "+" : "-", 437 ISSET(tp->t_state, TS_CARR_ON) ? "+" : "-", 438 ISSET(ch->ch_oports, ch->ch_o_dtr) ? "+" : "-", 439 ch->ch_tx_stopped ? "+" : "-"); 440 441 aprint_normal_dev(sc->sc_dev, 442 "chan %d: %s %scrtscts %scts %sts_ttstop %srts %xrx_flags\n", 443 ch->ch_num, str, 444 ISSET(tp->t_cflag, CRTSCTS) ? "+" : "-", 445 ISSET(ch->ch_iports, ch->ch_i_cts) ? "+" : "-", 446 ISSET(tp->t_state, TS_TTSTOP) ? "+" : "-", 447 ISSET(ch->ch_oports, ch->ch_o_rts) ? "+" : "-", 448 ch->ch_rx_flags); 449 } 450 #endif 451 452 #if defined(DDB) || defined(KGDB) 453 static void 454 sbscn_enable_debugport(struct sbscn_channel *ch) 455 { 456 int s; 457 458 /* Turn on line break interrupt, set carrier. */ 459 s = splserial(); 460 461 #if 0 /* DO NOT turn on break interrupt at this time. */ 462 ch->ch_imr = 0x04; 463 #else 464 ch->ch_imr = 0x00; 465 #endif 466 WRITE_REG(ch->ch_imr_base, ch->ch_imr); 467 SET(ch->ch_oports, ch->ch_o_dtr | ch->ch_o_rts); 468 SET_OUTPUT_SIGNALS(ch, ch->ch_oports); 469 470 splx(s); 471 } 472 #endif 473 474 void 475 sbscn_config(struct sbscn_channel *ch) 476 { 477 478 /* Disable interrupts before configuring the device. */ 479 ch->ch_imr = 0x00; 480 WRITE_REG(ch->ch_imr_base, ch->ch_imr); 481 482 #ifdef DDB 483 if (ISSET(ch->ch_hwflags, SBSCN_HW_CONSOLE)) 484 sbscn_enable_debugport(ch); 485 #endif 486 487 #ifdef KGDB 488 /* 489 * Allow kgdb to "take over" this port. If this is 490 * the kgdb device, it has exclusive use. 491 */ 492 if (ISSET(ch->ch_hwflags, SBSCN_HW_KGDB)) 493 sbscn_enable_debugport(ch); 494 #endif 495 } 496 497 void 498 sbscn_shutdown(struct sbscn_channel *ch) 499 { 500 struct tty *tp = ch->ch_tty; 501 int s; 502 503 s = splserial(); 504 505 /* If we were asserting flow control, then deassert it. */ 506 SET(ch->ch_rx_flags, RX_IBUF_BLOCKED); 507 sbscn_dohwiflow(ch); 508 509 /* Clear any break condition set with TIOCSBRK. */ 510 sbscn_break(ch, 0); 511 512 /* 513 * Hang up if necessary. Wait a bit, so the other side has time to 514 * notice even if we immediately open the port again. 515 * Avoid tsleeping above splhigh(). 516 */ 517 if (ISSET(tp->t_cflag, HUPCL)) { 518 sbscn_modem(ch, 0); 519 splx(s); 520 /* XXX tsleep will only timeout */ 521 (void) tsleep(ch, TTIPRI, ttclos, hz); 522 s = splserial(); 523 } 524 525 /* Turn off interrupts. */ 526 #ifdef DDB 527 if (ISSET(ch->ch_hwflags, SBSCN_HW_CONSOLE)) 528 #if 0 /* DO NOT turn on break interrupt at this time. */ 529 ch->ch_imr = 0x04; /* interrupt on break */ 530 #else 531 ch->ch_imr = 0x00; 532 #endif 533 else 534 #endif 535 ch->ch_imr = 0; 536 WRITE_REG(ch->ch_imr_base, ch->ch_imr); 537 538 splx(s); 539 } 540 541 int 542 sbscnopen(dev_t dev, int flag, int mode, struct lwp *l) 543 { 544 int chan = SBSCN_CHAN(dev); 545 struct sbscn_softc *sc; 546 struct sbscn_channel *ch; 547 struct tty *tp; 548 int s, s2; 549 int error; 550 551 sc = device_lookup_private(&sbscn_cd, SBSCN_UNIT(dev)); 552 if (sc == NULL) 553 return (ENXIO); 554 ch = &sc->sc_channels[chan]; 555 if (!ISSET(ch->ch_hwflags, SBSCN_HW_DEV_OK) || ch->ch_rbuf == NULL) 556 return (ENXIO); 557 558 #ifdef KGDB 559 /* 560 * If this is the kgdb port, no other use is permitted. 561 */ 562 if (ISSET(ch->ch_hwflags, SBSCN_HW_KGDB)) 563 return (EBUSY); 564 #endif 565 566 tp = ch->ch_tty; 567 568 if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp)) 569 return (EBUSY); 570 571 s = spltty(); 572 573 /* 574 * Do the following iff this is a first open. 575 */ 576 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 577 struct termios t; 578 579 tp->t_dev = dev; 580 581 s2 = splserial(); 582 583 /* Turn on receive, break, and status change interrupts. */ 584 #if 0 /* DO NOT turn on break or status change interrupt at this time. */ 585 ch->ch_imr = 0xe; 586 #else 587 ch->ch_imr = 0x2; 588 #endif 589 WRITE_REG(ch->ch_imr_base, ch->ch_imr); 590 591 /* Fetch the current modem control status, needed later. */ 592 ch->ch_iports = GET_INPUT_SIGNALS(ch); 593 ch->ch_iports_delta = 0; 594 splx(s2); 595 596 /* 597 * Initialize the termios status to the defaults. Add in the 598 * sticky bits from TIOCSFLAGS. 599 */ 600 t.c_ispeed = 0; 601 if (ISSET(ch->ch_hwflags, SBSCN_HW_CONSOLE)) { 602 t.c_ospeed = sbscn_cons_rate; 603 t.c_cflag = sbscn_cons_cflag; 604 } else { 605 t.c_ospeed = TTYDEF_SPEED; 606 t.c_cflag = TTYDEF_CFLAG; 607 } 608 if (ISSET(ch->ch_swflags, TIOCFLAG_CLOCAL)) 609 SET(t.c_cflag, CLOCAL); 610 if (ISSET(ch->ch_swflags, TIOCFLAG_CRTSCTS)) 611 SET(t.c_cflag, CRTSCTS); 612 if (ISSET(ch->ch_swflags, TIOCFLAG_MDMBUF)) 613 SET(t.c_cflag, MDMBUF); 614 /* Make sure sbscn_param() will do something. */ 615 tp->t_ospeed = 0; 616 (void) sbscn_param(tp, &t); 617 tp->t_iflag = TTYDEF_IFLAG; 618 tp->t_oflag = TTYDEF_OFLAG; 619 tp->t_lflag = TTYDEF_LFLAG; 620 ttychars(tp); 621 ttsetwater(tp); 622 623 s2 = splserial(); 624 625 /* 626 * Turn on DTR. We must always do this, even if carrier is not 627 * present, because otherwise we'd have to use TIOCSDTR 628 * immediately after setting CLOCAL, which applications do not 629 * expect. We always assert DTR while the device is open 630 * unless explicitly requested to deassert it. 631 */ 632 sbscn_modem(ch, 1); 633 634 /* Clear the input ring, and unblock. */ 635 ch->ch_rbput = ch->ch_rbget = ch->ch_rbuf; 636 ch->ch_rbavail = sbscn_rbuf_size; 637 sbscn_iflush(ch); 638 CLR(ch->ch_rx_flags, RX_ANY_BLOCK); 639 sbscn_dohwiflow(ch); 640 641 #ifdef SBSCN_DEBUG 642 if (sbscn_debug) 643 sbscn_status(ch, "sbscnopen "); 644 #endif 645 646 splx(s2); 647 } 648 649 splx(s); 650 651 error = ttyopen(tp, SBSCN_DIALOUT(dev), ISSET(flag, O_NONBLOCK)); 652 if (error) 653 goto bad; 654 655 error = (*tp->t_linesw->l_open)(dev, tp); 656 if (error) 657 goto bad; 658 659 return (0); 660 661 bad: 662 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 663 /* 664 * We failed to open the device, and nobody else had it opened. 665 * Clean up the state as appropriate. 666 */ 667 sbscn_shutdown(ch); 668 } 669 670 return (error); 671 } 672 673 int 674 sbscnclose(dev_t dev, int flag, int mode, struct lwp *l) 675 { 676 struct sbscn_softc *sc = device_lookup_private(&sbscn_cd, SBSCN_UNIT(dev)); 677 struct sbscn_channel *ch = &sc->sc_channels[SBSCN_CHAN(dev)]; 678 struct tty *tp = ch->ch_tty; 679 680 /* XXX This is for cons.c. */ 681 if (!ISSET(tp->t_state, TS_ISOPEN)) 682 return (0); 683 684 (*tp->t_linesw->l_close)(tp, flag); 685 ttyclose(tp); 686 687 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 688 /* 689 * Although we got a last close, the device may still be in 690 * use; e.g. if this was the dialout node, and there are still 691 * processes waiting for carrier on the non-dialout node. 692 */ 693 sbscn_shutdown(ch); 694 } 695 696 return (0); 697 } 698 699 int 700 sbscnread(dev_t dev, struct uio *uio, int flag) 701 { 702 struct sbscn_softc *sc = device_lookup_private(&sbscn_cd, SBSCN_UNIT(dev)); 703 struct sbscn_channel *ch = &sc->sc_channels[SBSCN_CHAN(dev)]; 704 struct tty *tp = ch->ch_tty; 705 706 return ((*tp->t_linesw->l_read)(tp, uio, flag)); 707 } 708 709 int 710 sbscnwrite(dev_t dev, struct uio *uio, int flag) 711 { 712 struct sbscn_softc *sc = device_lookup_private(&sbscn_cd, SBSCN_UNIT(dev)); 713 struct sbscn_channel *ch = &sc->sc_channels[SBSCN_CHAN(dev)]; 714 struct tty *tp = ch->ch_tty; 715 716 return ((*tp->t_linesw->l_write)(tp, uio, flag)); 717 } 718 719 int 720 sbscnpoll(dev_t dev, int events, struct lwp *l) 721 { 722 struct sbscn_softc *sc = device_lookup_private(&sbscn_cd, SBSCN_UNIT(dev)); 723 struct sbscn_channel *ch = &sc->sc_channels[SBSCN_CHAN(dev)]; 724 struct tty *tp = ch->ch_tty; 725 726 return ((*tp->t_linesw->l_poll)(tp, events, l)); 727 } 728 729 struct tty * 730 sbscntty(dev_t dev) 731 { 732 struct sbscn_softc *sc = device_lookup_private(&sbscn_cd, SBSCN_UNIT(dev)); 733 struct sbscn_channel *ch = &sc->sc_channels[SBSCN_CHAN(dev)]; 734 struct tty *tp = ch->ch_tty; 735 736 return (tp); 737 } 738 739 int 740 sbscnioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 741 { 742 struct sbscn_softc *sc = device_lookup_private(&sbscn_cd, SBSCN_UNIT(dev)); 743 struct sbscn_channel *ch = &sc->sc_channels[SBSCN_CHAN(dev)]; 744 struct tty *tp = ch->ch_tty; 745 int error; 746 int s; 747 748 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 749 if (error != EPASSTHROUGH) 750 return (error); 751 752 error = ttioctl(tp, cmd, data, flag, l); 753 if (error != EPASSTHROUGH) 754 return (error); 755 756 error = 0; 757 758 s = splserial(); 759 760 switch (cmd) { 761 case TIOCSBRK: 762 sbscn_break(ch, 1); 763 break; 764 765 case TIOCCBRK: 766 sbscn_break(ch, 0); 767 break; 768 769 case TIOCSDTR: 770 sbscn_modem(ch, 1); 771 break; 772 773 case TIOCCDTR: 774 sbscn_modem(ch, 0); 775 break; 776 777 case TIOCGFLAGS: 778 *(int *)data = ch->ch_swflags; 779 break; 780 781 case TIOCSFLAGS: 782 error = kauth_authorize_device_tty(l->l_cred, 783 KAUTH_DEVICE_TTY_PRIVSET, tp); 784 if (error) 785 break; 786 ch->ch_swflags = *(int *)data; 787 break; 788 789 case TIOCMSET: 790 case TIOCMBIS: 791 case TIOCMBIC: 792 tiocm_to_sbscn(ch, cmd, *(int *)data); 793 break; 794 795 case TIOCMGET: 796 *(int *)data = sbscn_to_tiocm(ch); 797 break; 798 799 default: 800 error = EPASSTHROUGH; 801 break; 802 } 803 804 splx(s); 805 806 #ifdef SBSCN_DEBUG 807 if (sbscn_debug) 808 sbscn_status(ch, "sbscn_ioctl "); 809 #endif 810 811 return (error); 812 } 813 814 integrate void 815 sbscn_schedrx(struct sbscn_channel *ch) 816 { 817 818 ch->ch_rx_ready = 1; 819 820 /* Wake up the poller. */ 821 softint_schedule(ch->ch_si); 822 } 823 824 void 825 sbscn_break(struct sbscn_channel *ch, int onoff) 826 { 827 828 /* XXXCGD delay break until not busy */ 829 if (onoff) 830 WRITE_REG(ch->ch_base + 0x50, 0x60); 831 else 832 WRITE_REG(ch->ch_base + 0x50, 0x70); 833 834 #if 0 835 if (!ch->ch_heldchange) { 836 if (ch->ch_tx_busy) { 837 ch->ch_heldtbc = ch->ch_tbc; 838 ch->ch_tbc = 0; 839 ch->ch_heldchange = 1; 840 } else 841 sbscn_loadchannelregs(ch); 842 } 843 #endif 844 } 845 846 void 847 sbscn_modem(struct sbscn_channel *ch, int onoff) 848 { 849 850 if (ch->ch_o_dtr == 0) 851 return; 852 853 if (onoff) 854 SET(ch->ch_oports, ch->ch_o_dtr); 855 else 856 CLR(ch->ch_oports, ch->ch_o_dtr); 857 858 if (!ch->ch_heldchange) { 859 if (ch->ch_tx_busy) { 860 ch->ch_heldtbc = ch->ch_tbc; 861 ch->ch_tbc = 0; 862 ch->ch_heldchange = 1; 863 } else 864 sbscn_loadchannelregs(ch); 865 } 866 } 867 868 void 869 tiocm_to_sbscn(struct sbscn_channel *ch, int how, int ttybits) 870 { 871 u_char bits; 872 873 bits = 0; 874 if (ISSET(ttybits, TIOCM_DTR)) 875 SET(bits, ch->ch_o_dtr); 876 if (ISSET(ttybits, TIOCM_RTS)) 877 SET(bits, ch->ch_o_rts); 878 879 switch (how) { 880 case TIOCMBIC: 881 CLR(ch->ch_oports, bits); 882 break; 883 884 case TIOCMBIS: 885 SET(ch->ch_oports, bits); 886 break; 887 888 case TIOCMSET: 889 ch->ch_oports = bits; 890 break; 891 } 892 893 if (!ch->ch_heldchange) { 894 if (ch->ch_tx_busy) { 895 ch->ch_heldtbc = ch->ch_tbc; 896 ch->ch_tbc = 0; 897 ch->ch_heldchange = 1; 898 } else 899 sbscn_loadchannelregs(ch); 900 } 901 } 902 903 int 904 sbscn_to_tiocm(struct sbscn_channel *ch) 905 { 906 u_char hwbits; 907 int ttybits = 0; 908 909 hwbits = ch->ch_oports; 910 if (ISSET(hwbits, ch->ch_o_dtr)) 911 SET(ttybits, TIOCM_DTR); 912 if (ISSET(hwbits, ch->ch_o_rts)) 913 SET(ttybits, TIOCM_RTS); 914 915 hwbits = ch->ch_iports; 916 if (ISSET(hwbits, ch->ch_i_dcd)) 917 SET(ttybits, TIOCM_CD); 918 if (ISSET(hwbits, ch->ch_i_cts)) 919 SET(ttybits, TIOCM_CTS); 920 if (ISSET(hwbits, ch->ch_i_dsr)) 921 SET(ttybits, TIOCM_DSR); 922 if (ISSET(hwbits, ch->ch_i_ri)) 923 SET(ttybits, TIOCM_RI); 924 925 if (ch->ch_imr != 0) 926 SET(ttybits, TIOCM_LE); 927 928 return (ttybits); 929 } 930 931 static int 932 cflag2modes(tcflag_t cflag, u_char *mode1p, u_char *mode2p) 933 { 934 u_char mode1; 935 u_char mode2; 936 int err = 0; 937 938 mode1 = mode2 = 0; 939 940 switch (ISSET(cflag, CSIZE)) { 941 case CS7: 942 mode1 |= 2; /* XXX */ 943 break; 944 default: 945 err = -1; 946 /* FALLTHRU for sanity */ 947 case CS8: 948 mode1 |= 3; /* XXX */ 949 break; 950 } 951 if (!ISSET(cflag, PARENB)) 952 mode1 |= 2 << 3; 953 else { 954 mode1 |= 0 << 3; 955 if (ISSET(cflag, PARODD)) 956 mode1 |= 1 << 2; 957 } 958 959 if (ISSET(cflag, CSTOPB)) 960 mode2 |= 1 << 3; /* two stop bits XXX not std */ 961 962 if (ISSET(cflag, CRTSCTS)) { 963 mode1 |= 1 << 7; 964 mode2 |= 1 << 4; 965 } 966 967 *mode1p = mode1; 968 *mode2p = mode2; 969 return (err); 970 } 971 972 int 973 sbscn_param(struct tty *tp, struct termios *t) 974 { 975 struct sbscn_softc *sc = device_lookup_private(&sbscn_cd, SBSCN_UNIT(tp->t_dev)); 976 struct sbscn_channel *ch = &sc->sc_channels[SBSCN_CHAN(tp->t_dev)]; 977 long brc; 978 u_char mode1, mode2; 979 int s; 980 981 /* XXX reset to console parameters if console? */ 982 #if 0 983 XXX disable, enable. 984 #endif 985 986 /* Check requested parameters. */ 987 if (sbscn_speed(t->c_ospeed, &brc) < 0) 988 return (EINVAL); 989 if (t->c_ispeed && t->c_ispeed != t->c_ospeed) 990 return (EINVAL); 991 992 /* 993 * For the console, always force CLOCAL and !HUPCL, so that the port 994 * is always active. 995 */ 996 if (ISSET(ch->ch_swflags, TIOCFLAG_SOFTCAR) || 997 ISSET(ch->ch_hwflags, SBSCN_HW_CONSOLE)) { 998 SET(t->c_cflag, CLOCAL); 999 CLR(t->c_cflag, HUPCL); 1000 } 1001 1002 /* 1003 * If there were no changes, don't do anything. This avoids dropping 1004 * input and improves performance when all we did was frob things like 1005 * VMIN and VTIME. 1006 */ 1007 if (tp->t_ospeed == t->c_ospeed && 1008 tp->t_cflag == t->c_cflag) 1009 return (0); 1010 1011 if (cflag2modes(t->c_cflag, &mode1, &mode2) < 0) 1012 return (EINVAL); 1013 1014 s = splserial(); 1015 1016 ch->ch_mode1 = mode1; 1017 ch->ch_mode2 = mode2; 1018 1019 /* 1020 * If we're not in a mode that assumes a connection is present, then 1021 * ignore carrier changes. 1022 */ 1023 if (ISSET(t->c_cflag, CLOCAL | MDMBUF)) 1024 ch->ch_i_dcd = 0; 1025 else 1026 ch->ch_i_dcd = ch->ch_i_dcd_pin; 1027 /* 1028 * Set the flow control pins depending on the current flow control 1029 * mode. 1030 */ 1031 if (ISSET(t->c_cflag, CRTSCTS)) { 1032 ch->ch_o_dtr = ch->ch_o_dtr_pin; 1033 ch->ch_o_rts = ch->ch_o_rts_pin; 1034 ch->ch_i_cts = ch->ch_i_cts_pin; 1035 /* hw controle enable bits in mod regs set by cflag2modes */ 1036 } else if (ISSET(t->c_cflag, MDMBUF)) { 1037 /* 1038 * For DTR/DCD flow control, make sure we don't toggle DTR for 1039 * carrier detection. 1040 */ 1041 ch->ch_o_dtr = 0; 1042 ch->ch_o_rts = ch->ch_o_dtr_pin; 1043 ch->ch_i_cts = ch->ch_i_dcd_pin; 1044 } else { 1045 /* 1046 * If no flow control, then always set RTS. This will make 1047 * the other side happy if it mistakenly thinks we're doing 1048 * RTS/CTS flow control. 1049 */ 1050 ch->ch_o_dtr = ch->ch_o_dtr_pin | ch->ch_o_rts_pin; 1051 ch->ch_o_rts = 0; 1052 ch->ch_i_cts = 0; 1053 if (ISSET(ch->ch_oports, ch->ch_o_dtr_pin)) 1054 SET(ch->ch_oports, ch->ch_o_rts_pin); 1055 else 1056 CLR(ch->ch_oports, ch->ch_o_rts_pin); 1057 } 1058 /* XXX maybe mask the ports which generate intrs? */ 1059 1060 ch->ch_brc = brc; 1061 1062 /* XXX maybe set fifo-full receive mode if RTSCTS and high speed? */ 1063 1064 /* And copy to tty. */ 1065 tp->t_ispeed = 0; 1066 tp->t_ospeed = t->c_ospeed; 1067 tp->t_cflag = t->c_cflag; 1068 1069 if (!ch->ch_heldchange) { 1070 if (ch->ch_tx_busy) { 1071 ch->ch_heldtbc = ch->ch_tbc; 1072 ch->ch_tbc = 0; 1073 ch->ch_heldchange = 1; 1074 } else 1075 sbscn_loadchannelregs(ch); 1076 } 1077 1078 if (!ISSET(t->c_cflag, CHWFLOW)) { 1079 /* Disable the high water mark. */ 1080 ch->ch_r_hiwat = 0; 1081 ch->ch_r_lowat = 0; 1082 if (ISSET(ch->ch_rx_flags, RX_TTY_OVERFLOWED)) { 1083 CLR(ch->ch_rx_flags, RX_TTY_OVERFLOWED); 1084 sbscn_schedrx(ch); 1085 } 1086 if (ISSET(ch->ch_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 1087 CLR(ch->ch_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 1088 sbscn_dohwiflow(ch); 1089 } 1090 } else { 1091 ch->ch_r_hiwat = sbscn_rbuf_hiwat; 1092 ch->ch_r_lowat = sbscn_rbuf_lowat; 1093 } 1094 1095 splx(s); 1096 1097 /* 1098 * Update the tty layer's idea of the carrier bit, in case we changed 1099 * CLOCAL or MDMBUF. We don't hang up here; we only do that by 1100 * explicit request. 1101 */ 1102 (void) (*tp->t_linesw->l_modem)(tp, 1103 ISSET(ch->ch_iports, ch->ch_i_dcd)); 1104 1105 #ifdef SBSCN_DEBUG 1106 if (sbscn_debug) 1107 sbscn_status(ch, "sbscnparam "); 1108 #endif 1109 1110 if (!ISSET(t->c_cflag, CHWFLOW)) { 1111 if (ch->ch_tx_stopped) { 1112 ch->ch_tx_stopped = 0; 1113 sbscn_start(tp); 1114 } 1115 } 1116 1117 return (0); 1118 } 1119 1120 void 1121 sbscn_iflush(struct sbscn_channel *ch) 1122 { 1123 #ifdef DIAGNOSTIC 1124 int reg; 1125 #endif 1126 int timo; 1127 1128 #ifdef DIAGNOSTIC 1129 reg = 0xffff; 1130 #endif 1131 timo = 50000; 1132 /* flush any pending I/O */ 1133 while (ISSET(READ_REG(ch->ch_base + 0x20), 0x01) 1134 && --timo) 1135 #ifdef DIAGNOSTIC 1136 reg = 1137 #else 1138 (void) 1139 #endif 1140 READ_REG(ch->ch_base + 0x60); 1141 #ifdef DIAGNOSTIC 1142 if (!timo) 1143 aprint_debug_dev(ch->ch_sc->sc_dev, 1144 "sbscn_iflush timeout %02x\n", reg & 0xff); 1145 #endif 1146 } 1147 1148 void 1149 sbscn_loadchannelregs(struct sbscn_channel *ch) 1150 { 1151 1152 /* XXXXX necessary? */ 1153 sbscn_iflush(ch); 1154 1155 WRITE_REG(ch->ch_imr_base, 0); 1156 1157 // XXX disable? 1158 WRITE_REG(ch->ch_base + 0x00, ch->ch_mode1); 1159 WRITE_REG(ch->ch_base + 0x10, ch->ch_mode2); 1160 WRITE_REG(ch->ch_base + 0x30, ch->ch_brc); 1161 1162 ch->ch_oports_active = ch->ch_oports; 1163 SET_OUTPUT_SIGNALS(ch, ch->ch_oports_active); 1164 1165 WRITE_REG(ch->ch_imr_base, ch->ch_imr); 1166 } 1167 1168 int 1169 sbscn_hwiflow(struct tty *tp, int block) 1170 { 1171 struct sbscn_softc *sc = device_lookup_private(&sbscn_cd, SBSCN_UNIT(tp->t_dev)); 1172 struct sbscn_channel *ch = &sc->sc_channels[SBSCN_CHAN(tp->t_dev)]; 1173 int s; 1174 1175 if (ch->ch_o_rts == 0) 1176 return (0); 1177 1178 s = splserial(); 1179 if (block) { 1180 if (!ISSET(ch->ch_rx_flags, RX_TTY_BLOCKED)) { 1181 SET(ch->ch_rx_flags, RX_TTY_BLOCKED); 1182 sbscn_dohwiflow(ch); 1183 } 1184 } else { 1185 if (ISSET(ch->ch_rx_flags, RX_TTY_OVERFLOWED)) { 1186 CLR(ch->ch_rx_flags, RX_TTY_OVERFLOWED); 1187 sbscn_schedrx(ch); 1188 } 1189 if (ISSET(ch->ch_rx_flags, RX_TTY_BLOCKED)) { 1190 CLR(ch->ch_rx_flags, RX_TTY_BLOCKED); 1191 sbscn_dohwiflow(ch); 1192 } 1193 } 1194 splx(s); 1195 return (1); 1196 } 1197 1198 /* 1199 * (un)block input via hw flowcontrol 1200 */ 1201 void 1202 sbscn_dohwiflow(struct sbscn_channel *ch) 1203 { 1204 1205 if (ch->ch_o_rts == 0) 1206 return; 1207 1208 if (ISSET(ch->ch_rx_flags, RX_ANY_BLOCK)) { 1209 CLR(ch->ch_oports, ch->ch_o_rts); 1210 CLR(ch->ch_oports_active, ch->ch_o_rts); 1211 } else { 1212 SET(ch->ch_oports, ch->ch_o_rts); 1213 SET(ch->ch_oports_active, ch->ch_o_rts); 1214 } 1215 SET_OUTPUT_SIGNALS(ch, ch->ch_oports_active); 1216 } 1217 1218 void 1219 sbscn_start(struct tty *tp) 1220 { 1221 struct sbscn_softc *sc = device_lookup_private(&sbscn_cd, SBSCN_UNIT(tp->t_dev)); 1222 struct sbscn_channel *ch = &sc->sc_channels[SBSCN_CHAN(tp->t_dev)]; 1223 int s; 1224 1225 s = spltty(); 1226 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 1227 goto out; 1228 if (ch->ch_tx_stopped) 1229 goto out; 1230 if (!ttypull(tp)) 1231 goto out; 1232 1233 /* Grab the first contiguous region of buffer space. */ 1234 { 1235 u_char *tba; 1236 int tbc; 1237 1238 tba = tp->t_outq.c_cf; 1239 tbc = ndqb(&tp->t_outq, 0); 1240 1241 (void)splserial(); 1242 1243 ch->ch_tba = tba; 1244 ch->ch_tbc = tbc; 1245 } 1246 1247 SET(tp->t_state, TS_BUSY); 1248 ch->ch_tx_busy = 1; 1249 1250 /* Enable transmit completion interrupts if necessary. */ 1251 if (!ISSET(ch->ch_imr, 0x1)) { 1252 SET(ch->ch_imr, 0x1); 1253 WRITE_REG(ch->ch_imr_base, ch->ch_imr); 1254 } 1255 1256 /* Output the first chunk of the contiguous buffer. */ 1257 { 1258 u_char c; 1259 1260 while (ch->ch_tbc && READ_REG(ch->ch_base + 0x20) & 0x04) { 1261 c = *ch->ch_tba++; 1262 ch->ch_tbc--; 1263 WRITE_REG(ch->ch_base + 0x70, c); 1264 } 1265 } 1266 out: 1267 splx(s); 1268 return; 1269 } 1270 1271 /* 1272 * Stop output on a line. 1273 */ 1274 void 1275 sbscnstop(struct tty *tp, int flag) 1276 { 1277 struct sbscn_softc *sc = device_lookup_private(&sbscn_cd, SBSCN_UNIT(tp->t_dev)); 1278 struct sbscn_channel *ch = &sc->sc_channels[SBSCN_CHAN(tp->t_dev)]; 1279 int s; 1280 1281 s = splserial(); 1282 if (ISSET(tp->t_state, TS_BUSY)) { 1283 /* Stop transmitting at the next chunk. */ 1284 ch->ch_tbc = 0; 1285 ch->ch_heldtbc = 0; 1286 if (!ISSET(tp->t_state, TS_TTSTOP)) 1287 SET(tp->t_state, TS_FLUSH); 1288 } 1289 splx(s); 1290 } 1291 1292 void 1293 sbscn_diag(void *arg) 1294 { 1295 struct sbscn_channel *ch = arg; 1296 struct sbscn_softc *sc = ch->ch_sc; 1297 int overflows, floods; 1298 int s; 1299 1300 s = splserial(); 1301 overflows = ch->ch_overflows; 1302 ch->ch_overflows = 0; 1303 floods = ch->ch_floods; 1304 ch->ch_floods = 0; 1305 ch->ch_errors = 0; 1306 splx(s); 1307 1308 log(LOG_WARNING, "%s: channel %d: %d fifo overflow%s, %d ibuf flood%s\n", 1309 device_xname(sc->sc_dev), ch->ch_num, 1310 overflows, overflows == 1 ? "" : "s", 1311 floods, floods == 1 ? "" : "s"); 1312 } 1313 1314 integrate void 1315 sbscn_rxsoft(struct sbscn_channel *ch, struct tty *tp) 1316 { 1317 int (*rint)(int, struct tty *) = tp->t_linesw->l_rint; 1318 u_char *get, *end; 1319 u_int cc, scc; 1320 u_char sr; 1321 int code; 1322 int s; 1323 1324 end = ch->ch_ebuf; 1325 get = ch->ch_rbget; 1326 scc = cc = sbscn_rbuf_size - ch->ch_rbavail; 1327 1328 if (cc == sbscn_rbuf_size) { 1329 ch->ch_floods++; 1330 if (ch->ch_errors++ == 0) 1331 callout_reset(&ch->ch_diag_callout, 60 * hz, 1332 sbscn_diag, ch); 1333 } 1334 1335 while (cc) { 1336 code = get[0]; 1337 sr = get[1]; 1338 if (ISSET(sr, 0xf0)) { 1339 if (ISSET(sr, 0x10)) { 1340 ch->ch_overflows++; 1341 if (ch->ch_errors++ == 0) 1342 callout_reset(&ch->ch_diag_callout, 1343 60 * hz, sbscn_diag, ch); 1344 } 1345 if (ISSET(sr, 0xc0)) 1346 SET(code, TTY_FE); 1347 if (ISSET(sr, 0x20)) 1348 SET(code, TTY_PE); 1349 } 1350 if ((*rint)(code, tp) == -1) { 1351 /* 1352 * The line discipline's buffer is out of space. 1353 */ 1354 if (!ISSET(ch->ch_rx_flags, RX_TTY_BLOCKED)) { 1355 /* 1356 * We're either not using flow control, or the 1357 * line discipline didn't tell us to block for 1358 * some reason. Either way, we have no way to 1359 * know when there's more space available, so 1360 * just drop the rest of the data. 1361 */ 1362 get += cc << 1; 1363 if (get >= end) 1364 get -= sbscn_rbuf_size << 1; 1365 cc = 0; 1366 } else { 1367 /* 1368 * Don't schedule any more receive processing 1369 * until the line discipline tells us there's 1370 * space available (through comhwiflow()). 1371 * Leave the rest of the data in the input 1372 * buffer. 1373 */ 1374 SET(ch->ch_rx_flags, RX_TTY_OVERFLOWED); 1375 } 1376 break; 1377 } 1378 get += 2; 1379 if (get >= end) 1380 get = ch->ch_rbuf; 1381 cc--; 1382 } 1383 1384 if (cc != scc) { 1385 ch->ch_rbget = get; 1386 s = splserial(); 1387 cc = ch->ch_rbavail += scc - cc; 1388 /* Buffers should be ok again, release possible block. */ 1389 if (cc >= ch->ch_r_lowat) { 1390 if (ISSET(ch->ch_rx_flags, RX_IBUF_OVERFLOWED)) { 1391 CLR(ch->ch_rx_flags, RX_IBUF_OVERFLOWED); 1392 SET(ch->ch_imr, 0x02); 1393 WRITE_REG(ch->ch_imr_base, ch->ch_imr); 1394 } 1395 if (ISSET(ch->ch_rx_flags, RX_IBUF_BLOCKED)) { 1396 CLR(ch->ch_rx_flags, RX_IBUF_BLOCKED); 1397 sbscn_dohwiflow(ch); 1398 } 1399 } 1400 splx(s); 1401 } 1402 } 1403 1404 integrate void 1405 sbscn_txsoft(struct sbscn_channel *ch, struct tty *tp) 1406 { 1407 1408 CLR(tp->t_state, TS_BUSY); 1409 if (ISSET(tp->t_state, TS_FLUSH)) 1410 CLR(tp->t_state, TS_FLUSH); 1411 else 1412 ndflush(&tp->t_outq, (int)(ch->ch_tba - tp->t_outq.c_cf)); 1413 (*tp->t_linesw->l_start)(tp); 1414 } 1415 1416 integrate void 1417 sbscn_stsoft(struct sbscn_channel *ch, struct tty *tp) 1418 { 1419 u_char iports, delta; 1420 int s; 1421 1422 s = splserial(); 1423 iports = ch->ch_iports; 1424 delta = ch->ch_iports_delta; 1425 ch->ch_iports_delta = 0; 1426 splx(s); 1427 1428 if (ISSET(delta, ch->ch_i_dcd)) { 1429 /* 1430 * Inform the tty layer that carrier detect changed. 1431 */ 1432 (void) (*tp->t_linesw->l_modem)(tp, 1433 ISSET(iports, ch->ch_i_dcd)); 1434 } 1435 1436 if (ISSET(delta, ch->ch_i_cts)) { 1437 /* Block or unblock output according to flow control. */ 1438 if (ISSET(iports, ch->ch_i_cts)) { 1439 ch->ch_tx_stopped = 0; 1440 (*tp->t_linesw->l_start)(tp); 1441 } else { 1442 ch->ch_tx_stopped = 1; 1443 } 1444 } 1445 1446 #ifdef SBSCN_DEBUG 1447 if (sbscn_debug) 1448 sbscn_status(ch, "sbscn_stsoft"); 1449 #endif 1450 } 1451 1452 void 1453 sbscn_soft(void *arg) 1454 { 1455 struct sbscn_channel *ch = arg; 1456 struct tty *tp = ch->ch_tty; 1457 1458 if (ch->ch_rx_ready) { 1459 ch->ch_rx_ready = 0; 1460 sbscn_rxsoft(ch, tp); 1461 } 1462 1463 if (ch->ch_st_check) { 1464 ch->ch_st_check = 0; 1465 sbscn_stsoft(ch, tp); 1466 } 1467 1468 if (ch->ch_tx_done) { 1469 ch->ch_tx_done = 0; 1470 sbscn_txsoft(ch, tp); 1471 } 1472 } 1473 1474 void 1475 sbscn_intr(void *arg, uint32_t status, vaddr_t pc) 1476 { 1477 struct sbscn_channel *ch = arg; 1478 u_char *put, *end; 1479 u_int cc; 1480 u_char isr, sr; 1481 1482 /* read ISR */ 1483 isr = READ_REG(ch->ch_isr_base) & ch->ch_imr; 1484 if (isr == 0) 1485 return; 1486 1487 end = ch->ch_ebuf; 1488 put = ch->ch_rbput; 1489 cc = ch->ch_rbavail; 1490 1491 do { 1492 u_char iports, delta; 1493 1494 if (isr & 0x02) { 1495 1496 sr = READ_REG(ch->ch_base + 0x20); 1497 /* XXX sr 0x01 bit must be set at this point */ 1498 1499 #if defined(DDB) || defined(KGDB) 1500 if ((sr & 0x80) == 0x80) { 1501 #ifdef DDB 1502 if (ISSET(ch->ch_hwflags, SBSCN_HW_CONSOLE)) { 1503 (void)READ_REG(ch->ch_base + 0x60); 1504 console_debugger(); 1505 continue; 1506 } 1507 #endif 1508 #ifdef KGDB 1509 if (ISSET(ch->ch_hwflags, SBSCN_HW_KGDB)) { 1510 (void)READ_REG(ch->ch_base + 0x60); 1511 kgdb_connect(1); 1512 continue; 1513 } 1514 #endif 1515 } 1516 #endif /* DDB || KGDB */ 1517 1518 if (!ISSET(ch->ch_rx_flags, RX_IBUF_OVERFLOWED)) { 1519 while (cc > 0) { 1520 put[0] = READ_REG(ch->ch_base + 0x60); 1521 put[1] = sr; 1522 put += 2; 1523 if (put >= end) 1524 put = ch->ch_rbuf; 1525 cc--; 1526 1527 sr = READ_REG(ch->ch_base + 0x20); 1528 if (!ISSET(sr, 0x02)) 1529 break; 1530 } 1531 1532 /* 1533 * Current string of incoming characters ended 1534 * because no more data was available or we 1535 * ran out of space. Schedule a receive event 1536 * if any data was received. If we're out of 1537 * space, turn off receive interrupts. 1538 */ 1539 ch->ch_rbput = put; 1540 ch->ch_rbavail = cc; 1541 if (!ISSET(ch->ch_rx_flags, RX_TTY_OVERFLOWED)) 1542 ch->ch_rx_ready = 1; 1543 1544 /* 1545 * See if we are in danger of overflowing a 1546 * buffer. If so, use hardware flow control 1547 * to ease the pressure. 1548 */ 1549 if (!ISSET(ch->ch_rx_flags, RX_IBUF_BLOCKED) && 1550 cc < ch->ch_r_hiwat) { 1551 SET(ch->ch_rx_flags, RX_IBUF_BLOCKED); 1552 sbscn_dohwiflow(ch); 1553 } 1554 1555 /* 1556 * If we're out of space, disable receive 1557 * interrupts until the queue has drained 1558 * a bit. 1559 */ 1560 if (!cc) { 1561 SET(ch->ch_rx_flags, 1562 RX_IBUF_OVERFLOWED); 1563 CLR(ch->ch_imr, 0x02); 1564 WRITE_REG(ch->ch_imr_base, ch->ch_imr); 1565 } 1566 } else { 1567 /* XXX panic? */ 1568 CLR(ch->ch_imr, 0x02); 1569 WRITE_REG(ch->ch_imr_base, ch->ch_imr); 1570 continue; 1571 } 1572 } 1573 1574 if (isr & 0x01) { 1575 CLR(ch->ch_imr, 0x01); 1576 WRITE_REG(ch->ch_imr_base, ch->ch_imr); 1577 } 1578 1579 #if 0 1580 XXX 1581 if (isr & 0x08) { 1582 clear input signal change! 1583 } 1584 #endif 1585 iports = GET_INPUT_SIGNALS(ch); 1586 delta = iports ^ ch->ch_iports; 1587 ch->ch_iports = iports; 1588 1589 /* 1590 * Process normal status changes 1591 */ 1592 if (ISSET(delta, ch->ch_i_mask)) { 1593 SET(ch->ch_iports_delta, delta); 1594 1595 /* 1596 * Stop output immediately if we lose the output 1597 * flow control signal or carrier detect. 1598 */ 1599 if (ISSET(~iports, ch->ch_i_mask)) { 1600 ch->ch_tbc = 0; 1601 ch->ch_heldtbc = 0; 1602 #ifdef SBSCN_DEBUG 1603 if (sbscn_debug) 1604 sbscn_status(ch, "sbscn_intr "); 1605 #endif 1606 } 1607 1608 ch->ch_st_check = 1; 1609 } 1610 } while ((isr = (READ_REG(ch->ch_isr_base) & ch->ch_imr)) != 0); 1611 1612 /* 1613 * Done handling any receive interrupts and status changes, and 1614 * clearing the tx-ready interrupt if it was set. See if data can 1615 * be transmitted as well. Schedule tx done event if no data left 1616 * and tty was marked busy. 1617 */ 1618 sr = READ_REG(ch->ch_base + 0x20); 1619 if (ISSET(sr, 0x4)) { 1620 1621 /* 1622 * If we've delayed a parameter change, do it now, and restart 1623 * output. 1624 */ 1625 if (ch->ch_heldchange) { 1626 sbscn_loadchannelregs(ch); 1627 ch->ch_heldchange = 0; 1628 ch->ch_tbc = ch->ch_heldtbc; 1629 ch->ch_heldtbc = 0; 1630 } 1631 1632 /* Output the next chunk of the contiguous buffer, if any. */ 1633 if (ch->ch_tbc > 0) { 1634 int wrote1; 1635 u_char c; 1636 1637 wrote1 = 0; 1638 while (ch->ch_tbc && 1639 READ_REG(ch->ch_base + 0x20) & 0x04) { 1640 wrote1 = 1; 1641 c = *ch->ch_tba++; 1642 ch->ch_tbc--; 1643 WRITE_REG(ch->ch_base + 0x70, c); 1644 } 1645 if (wrote1) { 1646 SET(ch->ch_imr, 0x01); 1647 WRITE_REG(ch->ch_imr_base, ch->ch_imr); 1648 } 1649 } else { 1650 /* 1651 * transmit completion interrupts already disabled, 1652 * mark the channel tx state as done. 1653 */ 1654 if (ch->ch_tx_busy) { 1655 ch->ch_tx_busy = 0; 1656 ch->ch_tx_done = 1; 1657 } 1658 } 1659 } 1660 1661 /* Wake up the poller. */ 1662 softint_schedule(ch->ch_si); 1663 1664 #ifdef RND_SBSCN 1665 rnd_add_uint32(&ch->ch_rnd_source, isr | sr); 1666 #endif 1667 } 1668 1669 /* 1670 * The following functions are polled getc and putc routines, shared 1671 * by the console and kgdb glue. 1672 */ 1673 1674 int 1675 sbscn_common_getc(u_long addr, int chan) 1676 { 1677 int s = splhigh(); 1678 u_long base = MIPS_PHYS_TO_KSEG1(addr + (chan * 0x100)); 1679 int c; 1680 1681 /* block until a character becomes available */ 1682 while ((READ_REG(base + 0x20) & 0x01) == 0) 1683 continue; 1684 1685 c = READ_REG(base + 0x60) & 0xff; 1686 splx(s); 1687 return (c); 1688 } 1689 1690 void 1691 sbscn_common_putc(u_long addr, int chan, int c) 1692 { 1693 int s = splhigh(); 1694 int timo; 1695 u_long base = MIPS_PHYS_TO_KSEG1(addr + (chan * 0x100)); 1696 1697 /* wait for any pending transmission to finish */ 1698 timo = 1500000; 1699 while ((READ_REG(base + 0x20) & 0x08) == 0 && --timo) 1700 continue; 1701 1702 WRITE_REG(base + 0x70, c); 1703 1704 /* wait for this transmission to complete */ 1705 timo = 15000000; 1706 while ((READ_REG(base + 0x20) & 0x08) == 0 && --timo) 1707 continue; 1708 1709 splx(s); 1710 } 1711 1712 /* 1713 * Initialize UART for use as console or KGDB line. 1714 */ 1715 int 1716 sbscn_init(u_long addr, int chan, int rate, tcflag_t cflag) 1717 { 1718 #if 1 1719 u_long chanregbase = MIPS_PHYS_TO_KSEG1(addr + (chan * 0x100)); 1720 u_long imaskreg = MIPS_PHYS_TO_KSEG1(addr + 0x230 + (chan * 0x20)); 1721 u_char mode1, mode2; 1722 u_long brc; 1723 volatile int timo; 1724 1725 WRITE_REG(imaskreg, 0); /* disable channel intrs */ 1726 1727 /* XXX should we really do the following? how about only if enabled? */ 1728 /* wait for any pending transmission to finish */ 1729 timo = 1500000; 1730 while ((READ_REG(chanregbase + 0x20) & 0x08) == 0 && --timo) 1731 continue; 1732 1733 /* XXX: wait a little. THIS SHOULD NOT BE NECESSARY!!! (?) */ 1734 timo = 1500000; 1735 while (--timo) 1736 ; 1737 1738 WRITE_REG(chanregbase + 0x50, 2 << 4); /* reset receiver */ 1739 WRITE_REG(chanregbase + 0x50, 3 << 4); /* reset transmitter */ 1740 1741 /* set up the line for use */ 1742 (void)cflag2modes(cflag, &mode1, &mode2); 1743 (void)sbscn_speed(rate, &brc); 1744 WRITE_REG(chanregbase + 0x00, mode1); 1745 WRITE_REG(chanregbase + 0x10, mode2); 1746 WRITE_REG(chanregbase + 0x30, brc); 1747 1748 /* enable transmit and receive */ 1749 #define M_DUART_RX_EN 0x01 1750 #define M_DUART_TX_EN 0x04 1751 WRITE_REG(chanregbase + 0x50,M_DUART_RX_EN | M_DUART_TX_EN); 1752 #endif 1753 1754 /* XXX: wait a little. THIS SHOULD NOT BE NECESSARY!!! (?) */ 1755 timo = 1500000; 1756 while (--timo) 1757 ; 1758 1759 #if 0 /* XXXCGD */ 1760 bus_space_handle_t ioh; 1761 1762 if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) 1763 return (ENOMEM); /* ??? */ 1764 1765 bus_space_write_1(iot, ioh, com_lcr, LCR_EERS); 1766 bus_space_write_1(iot, ioh, com_efr, 0); 1767 bus_space_write_1(iot, ioh, com_lcr, LCR_DLAB); 1768 rate = comspeed(rate, frequency); 1769 bus_space_write_1(iot, ioh, com_dlbl, rate); 1770 bus_space_write_1(iot, ioh, com_dlbh, rate >> 8); 1771 bus_space_write_1(iot, ioh, com_lcr, cflag2lcr(cflag)); 1772 bus_space_write_1(iot, ioh, com_mcr, MCR_DTR | MCR_RTS); 1773 bus_space_write_1(iot, ioh, com_fifo, 1774 FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_1); 1775 bus_space_write_1(iot, ioh, com_ier, 0); 1776 1777 *iohp = ioh; 1778 return (0); 1779 #endif /* XXXCGD */ 1780 /* XXXCGD */ 1781 return (0); 1782 } 1783 1784 /* 1785 * Following are all routines needed for sbscn to act as console 1786 */ 1787 int 1788 sbscn_cnattach(u_long addr, int chan, int rate, tcflag_t cflag) 1789 { 1790 int res; 1791 static struct consdev sbscn_cons = { 1792 NULL, NULL, sbscn_cngetc, sbscn_cnputc, sbscn_cnpollc, NULL, 1793 NULL, NULL, NODEV, CN_NORMAL 1794 }; 1795 1796 res = sbscn_init(addr, chan, rate, cflag); 1797 if (res) 1798 return (res); 1799 1800 cn_tab = &sbscn_cons; 1801 1802 sbscn_cons_present = 1; 1803 sbscn_cons_addr = addr; 1804 sbscn_cons_chan = chan; 1805 sbscn_cons_rate = rate; 1806 sbscn_cons_cflag = cflag; 1807 1808 return (0); 1809 } 1810 1811 int 1812 sbscn_cngetc(dev_t dev) 1813 { 1814 1815 return (sbscn_common_getc(sbscn_cons_addr, sbscn_cons_chan)); 1816 } 1817 1818 /* 1819 * Console kernel output character routine. 1820 */ 1821 void 1822 sbscn_cnputc(dev_t dev, int c) 1823 { 1824 1825 sbscn_common_putc(sbscn_cons_addr, sbscn_cons_chan, c); 1826 } 1827 1828 void 1829 sbscn_cnpollc(dev_t dev, int on) 1830 { 1831 1832 } 1833 1834 #ifdef KGDB 1835 int 1836 sbscn_kgdb_attach(u_long addr, int chan, int rate, tcflag_t cflag) 1837 { 1838 int res; 1839 1840 if (!sbscn_cons_present && 1841 sbscn_cons_addr == addr && sbscn_cons_chan == chan) 1842 return (EBUSY); /* cannot share with console */ 1843 1844 res = sbscn_init(addr, chan, rate, cflag); 1845 if (res) 1846 return (res); 1847 1848 kgdb_attach(sbscn_kgdb_getc, sbscn_kgdb_putc, NULL); 1849 kgdb_dev = 123; /* unneeded, only to satisfy some tests */ 1850 1851 sbscn_kgdb_present = 1; 1852 sbscn_kgdb_addr = addr; 1853 sbscn_kgdb_chan = chan; 1854 1855 return (0); 1856 } 1857 1858 /* ARGSUSED */ 1859 int 1860 sbscn_kgdb_getc(void *arg) 1861 { 1862 1863 return (sbscn_common_getc(sbscn_kgdb_addr, sbscn_kgdb_chan)); 1864 } 1865 1866 /* ARGSUSED */ 1867 void 1868 sbscn_kgdb_putc(void *arg, int c) 1869 { 1870 1871 sbscn_common_getc(sbscn_kgdb_addr, sbscn_kgdb_chan, c); 1872 } 1873 #endif /* KGDB */ 1874 1875 /* 1876 * helper function to identify the sbscn channels used by 1877 * console or KGDB (and not yet autoconf attached) 1878 */ 1879 int 1880 sbscn_is_console(u_long addr, int chan) 1881 { 1882 1883 if (sbscn_cons_present && !sbscn_cons_attached && 1884 sbscn_cons_addr == addr && sbscn_cons_chan == chan) 1885 return (1); 1886 #ifdef KGDB 1887 if (sbscn_kgdb_present && !sbscn_kgdb_attached && 1888 sbscn_kgdb_addr == addr && sbscn_kgdb_chan == chan) 1889 return (1); 1890 #endif 1891 return (0); 1892 } 1893
Indexes created Sat Sep 27 14:09:57 GMT 2025