sbscn.c revision 1.27
1 /* $NetBSD: sbscn.c,v 1.27 2008/06/13 12:08:01 cegger 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 1.27 2008/06/13 12:08:01 cegger Exp $"); 113 114 #define SBSCN_DEBUG 115 116 #include "opt_ddb.h" 117 118 #include "rnd.h" 119 #if NRND > 0 && defined(RND_SBSCN) 120 #include <sys/rnd.h> 121 #endif 122 123 #include <sys/param.h> 124 #include <sys/systm.h> 125 #include <sys/ioctl.h> 126 #include <sys/select.h> 127 #include <sys/tty.h> 128 #include <sys/proc.h> 129 #include <sys/user.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 <machine/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, uint32_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 extern struct cfdriver sbscn_cd; 180 181 dev_type_open(sbscnopen); 182 dev_type_close(sbscnclose); 183 dev_type_read(sbscnread); 184 dev_type_write(sbscnwrite); 185 dev_type_ioctl(sbscnioctl); 186 dev_type_stop(sbscnstop); 187 dev_type_tty(sbscntty); 188 dev_type_poll(sbscnpoll); 189 190 const struct cdevsw sbscn_cdevsw = { 191 sbscnopen, sbscnclose, sbscnread, sbscnwrite, sbscnioctl, 192 sbscnstop, sbscntty, sbscnpoll, nommap, ttykqfilter, D_TTY 193 }; 194 195 #define integrate static inline 196 void sbscn_soft(void *); 197 integrate void sbscn_rxsoft(struct sbscn_channel *, struct tty *); 198 integrate void sbscn_txsoft(struct sbscn_channel *, struct tty *); 199 integrate void sbscn_stsoft(struct sbscn_channel *, struct tty *); 200 integrate void sbscn_schedrx(struct sbscn_channel *); 201 void sbscn_diag(void *); 202 203 /* 204 * Make this an option variable one can patch. 205 * But be warned: this must be a power of 2! 206 */ 207 u_int sbscn_rbuf_size = SBSCN_RING_SIZE; 208 209 /* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */ 210 u_int sbscn_rbuf_hiwat = (SBSCN_RING_SIZE * 1) / 4; 211 u_int sbscn_rbuf_lowat = (SBSCN_RING_SIZE * 3) / 4; 212 213 static int sbscn_cons_present; 214 static int sbscn_cons_attached; 215 static u_long sbscn_cons_addr; 216 static int sbscn_cons_chan; 217 static int sbscn_cons_rate; 218 static tcflag_t sbscn_cons_cflag; 219 220 #ifdef KGDB 221 #include <sys/kgdb.h> 222 223 static int sbscn_kgdb_present; 224 static int sbscn_kgdb_attached; 225 static u_long sbscn_kgdb_addr; 226 static int sbscn_kgdb_chan; 227 228 int sbscn_kgdb_getc(void *); 229 void sbscn_kgdb_putc(void *, int); 230 #endif /* KGDB */ 231 232 static int sbscn_match(struct device *, struct cfdata *, void *); 233 static void sbscn_attach(struct device *, struct device *, void *); 234 235 CFATTACH_DECL(sbscn, sizeof(struct sbscn_softc), 236 sbscn_match, sbscn_attach, NULL, NULL); 237 238 #define READ_REG(rp) (mips3_ld((int64_t *)__UNVOLATILE(rp))) 239 #define WRITE_REG(rp, val) (mips3_sd((uint64_t *)__UNVOLATILE(rp), (val))) 240 241 /* 242 * input and output signals are actually the _inverse_ of the bits in the 243 * input and output port registers! 244 */ 245 #define GET_INPUT_SIGNALS(ch) \ 246 ((~READ_REG(MIPS_PHYS_TO_KSEG1((ch)->ch_sc->sc_addr + 0x280))) & (ch)->ch_i_mask) 247 #define SET_OUTPUT_SIGNALS(ch, val) \ 248 do { \ 249 int sigs_to_set, sigs_to_clr; \ 250 \ 251 sigs_to_set = (ch)->ch_o_mask & val; \ 252 sigs_to_clr = (ch)->ch_o_mask & ~val; \ 253 \ 254 /* set signals by clearing op bits, and vice versa */ \ 255 WRITE_REG(MIPS_PHYS_TO_KSEG1((ch)->ch_sc->sc_addr + 0x2c0), \ 256 sigs_to_set); \ 257 WRITE_REG(MIPS_PHYS_TO_KSEG1((ch)->ch_sc->sc_addr + 0x2b0), \ 258 sigs_to_clr); \ 259 } while (0) 260 261 static int 262 sbscn_match(struct device *parent, struct cfdata *match, void *aux) 263 { 264 struct sbobio_attach_args *sap = aux; 265 266 if (sap->sa_locs.sa_type != SBOBIO_DEVTYPE_DUART) 267 return (0); 268 269 return 1; 270 } 271 272 static void 273 sbscn_attach(struct device *parent, struct device *self, void *aux) 274 { 275 struct sbscn_softc *sc = (struct sbscn_softc *)self; 276 struct sbobio_attach_args *sap = aux; 277 int i; 278 279 sc->sc_addr = sap->sa_base + sap->sa_locs.sa_offset; 280 281 printf("\n"); 282 for (i = 0; i < 2; i++) 283 sbscn_attach_channel(sc, i, sap->sa_locs.sa_intr[i]); 284 285 /* init duart_opcr */ 286 WRITE_REG(MIPS_PHYS_TO_KSEG1(sc->sc_addr + 0x270), 0); 287 /* init duart_aux_ctrl */ 288 WRITE_REG(MIPS_PHYS_TO_KSEG1(sc->sc_addr + 0x210), 0x0f); /* XXX */ 289 } 290 291 void 292 sbscn_attach_channel(struct sbscn_softc *sc, int chan, int intr) 293 { 294 struct sbscn_channel *ch = &sc->sc_channels[chan]; 295 u_long chan_addr; 296 struct tty *tp; 297 298 ch->ch_sc = sc; 299 ch->ch_num = chan; 300 301 chan_addr = sc->sc_addr + (0x100 * chan); 302 ch->ch_base = (void *)MIPS_PHYS_TO_KSEG1(chan_addr); 303 ch->ch_isr_base = 304 (void *)MIPS_PHYS_TO_KSEG1(sc->sc_addr + 0x220 + (0x20 * chan)); 305 ch->ch_imr_base = 306 (void *)MIPS_PHYS_TO_KSEG1(sc->sc_addr + 0x230 + (0x20 * chan)); 307 #ifdef XXXCGDnotyet 308 ch->ch_inchg_base = 309 (void *)MIPS_PHYS_TO_KSEG1(sc->sc_addr + 0x2d0 + (0x10 * chan)); 310 #endif 311 312 ch->ch_i_dcd = ch->ch_i_dcd_pin = 0 /* XXXCGD */; 313 ch->ch_i_cts = ch->ch_i_cts_pin = 0 /* XXXCGD */; 314 ch->ch_i_dsr = ch->ch_i_dsr_pin = 0 /* XXXCGD */; 315 ch->ch_i_ri = ch->ch_i_ri_pin = 0 /* XXXCGD */; 316 ch->ch_i_mask = 317 ch->ch_i_dcd | ch->ch_i_cts | ch->ch_i_dsr | ch->ch_i_ri; 318 ch->ch_o_dtr = ch->ch_o_dtr_pin = 0 /* XXXCGD */; 319 ch->ch_o_rts = ch->ch_o_rts_pin = 0 /* XXXCGD */; 320 ch->ch_o_mask = ch->ch_o_dtr | ch->ch_o_rts; 321 322 ch->ch_intrhand = cpu_intr_establish(intr, IPL_SERIAL, sbscn_intr, ch); 323 callout_init(&ch->ch_diag_callout, 0); 324 325 /* Disable interrupts before configuring the device. */ 326 ch->ch_imr = 0; 327 WRITE_REG(ch->ch_imr_base, ch->ch_imr); 328 329 if (sbscn_cons_present && 330 sbscn_cons_addr == chan_addr && sbscn_cons_chan == chan) { 331 sbscn_cons_attached = 1; 332 333 /* Make sure the console is always "hardwired". */ 334 delay(1000); /* wait for output to finish */ 335 SET(ch->ch_hwflags, SBSCN_HW_CONSOLE); 336 SET(ch->ch_swflags, TIOCFLAG_SOFTCAR); 337 } 338 339 tp = ttymalloc(); 340 tp->t_oproc = sbscn_start; 341 tp->t_param = sbscn_param; 342 tp->t_hwiflow = sbscn_hwiflow; 343 344 ch->ch_tty = tp; 345 ch->ch_rbuf = malloc(sbscn_rbuf_size << 1, M_DEVBUF, M_NOWAIT); 346 if (ch->ch_rbuf == NULL) { 347 printf("%s: channel %d: unable to allocate ring buffer\n", 348 sc->sc_dev.dv_xname, 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 printf("%s: channel %d: console\n", sc->sc_dev.dv_xname, chan); 365 } 366 367 #ifdef KGDB 368 /* 369 * Allow kgdb to "take over" this port. If this is 370 * the kgdb device, it has exclusive use. 371 */ 372 if (sbscn_kgdb_present && 373 sbscn_kgdb_addr == chan_addr && sbscn_kgdb_chan == chan) { 374 sbscn_kgdb_attached = 1; 375 376 SET(sc->sc_hwflags, SBSCN_HW_KGDB); 377 printf("%s: channel %d: kgdb\n", sc->sc_dev.dv_xname, chan); 378 } 379 #endif 380 381 ch->ch_si = softint_establish(SOFTINT_SERIAL, sbscn_soft, ch); 382 383 #if NRND > 0 && defined(RND_SBSCN) 384 rnd_attach_source(&ch->ch_rnd_source, sc->sc_dev.dv_xname, 385 RND_TYPE_TTY, 0); 386 #endif 387 388 sbscn_config(ch); 389 390 SET(ch->ch_hwflags, SBSCN_HW_DEV_OK); 391 } 392 393 int 394 sbscn_speed(long speed, long *brcp) 395 { 396 #define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */ 397 398 int x, err; 399 int frequency = 100000000; 400 401 *brcp = divrnd(frequency / 20, speed) - 1; 402 403 if (speed <= 0) 404 return (-1); 405 x = divrnd(frequency / 20, speed); 406 if (x <= 0) 407 return (-1); 408 err = divrnd(((quad_t)frequency) * 1000 / 20, speed * x) - 1000; 409 if (err < 0) 410 err = -err; 411 if (err > SBSCN_TOLERANCE) 412 return (-1); 413 *brcp = x - 1; 414 return (0); 415 416 #undef divrnd 417 } 418 419 #ifdef SBSCN_DEBUG 420 void sbscn_status(struct sbscn_channel *, const char *); 421 422 int sbscn_debug = 0 /* XXXCGD */; 423 424 void 425 sbscn_status(struct sbscn_channel *ch, const char *str) 426 { 427 struct sbscn_softc *sc = ch->ch_sc; 428 struct tty *tp = ch->ch_tty; 429 430 printf("%s: chan %d: %s %sclocal %sdcd %sts_carr_on %sdtr %stx_stopped\n", 431 sc->sc_dev.dv_xname, ch->ch_num, str, 432 ISSET(tp->t_cflag, CLOCAL) ? "+" : "-", 433 ISSET(ch->ch_iports, ch->ch_i_dcd) ? "+" : "-", 434 ISSET(tp->t_state, TS_CARR_ON) ? "+" : "-", 435 ISSET(ch->ch_oports, ch->ch_o_dtr) ? "+" : "-", 436 ch->ch_tx_stopped ? "+" : "-"); 437 438 printf("%s: chan %d: %s %scrtscts %scts %sts_ttstop %srts %xrx_flags\n", 439 sc->sc_dev.dv_xname, ch->ch_num, str, 440 ISSET(tp->t_cflag, CRTSCTS) ? "+" : "-", 441 ISSET(ch->ch_iports, ch->ch_i_cts) ? "+" : "-", 442 ISSET(tp->t_state, TS_TTSTOP) ? "+" : "-", 443 ISSET(ch->ch_oports, ch->ch_o_rts) ? "+" : "-", 444 ch->ch_rx_flags); 445 } 446 #endif 447 448 #if defined(DDB) || defined(KGDB) 449 static void 450 sbscn_enable_debugport(struct sbscn_channel *ch) 451 { 452 int s; 453 454 /* Turn on line break interrupt, set carrier. */ 455 s = splserial(); 456 457 #if 0 /* DO NOT turn on break interrupt at this time. */ 458 ch->ch_imr = 0x04; 459 #else 460 ch->ch_imr = 0x00; 461 #endif 462 WRITE_REG(ch->ch_imr_base, ch->ch_imr); 463 SET(ch->ch_oports, ch->ch_o_dtr | ch->ch_o_rts); 464 SET_OUTPUT_SIGNALS(ch, ch->ch_oports); 465 466 splx(s); 467 } 468 #endif 469 470 void 471 sbscn_config(struct sbscn_channel *ch) 472 { 473 474 /* Disable interrupts before configuring the device. */ 475 ch->ch_imr = 0x00; 476 WRITE_REG(ch->ch_imr_base, ch->ch_imr); 477 478 #ifdef DDB 479 if (ISSET(ch->ch_hwflags, SBSCN_HW_CONSOLE)) 480 sbscn_enable_debugport(ch); 481 #endif 482 483 #ifdef KGDB 484 /* 485 * Allow kgdb to "take over" this port. If this is 486 * the kgdb device, it has exclusive use. 487 */ 488 if (ISSET(ch->ch_hwflags, SBSCN_HW_KGDB)) 489 sbscn_enable_debugport(ch); 490 #endif 491 } 492 493 void 494 sbscn_shutdown(struct sbscn_channel *ch) 495 { 496 struct tty *tp = ch->ch_tty; 497 int s; 498 499 s = splserial(); 500 501 /* If we were asserting flow control, then deassert it. */ 502 SET(ch->ch_rx_flags, RX_IBUF_BLOCKED); 503 sbscn_dohwiflow(ch); 504 505 /* Clear any break condition set with TIOCSBRK. */ 506 sbscn_break(ch, 0); 507 508 /* 509 * Hang up if necessary. Wait a bit, so the other side has time to 510 * notice even if we immediately open the port again. 511 * Avoid tsleeping above splhigh(). 512 */ 513 if (ISSET(tp->t_cflag, HUPCL)) { 514 sbscn_modem(ch, 0); 515 splx(s); 516 /* XXX tsleep will only timeout */ 517 (void) tsleep(ch, TTIPRI, ttclos, hz); 518 s = splserial(); 519 } 520 521 /* Turn off interrupts. */ 522 #ifdef DDB 523 if (ISSET(ch->ch_hwflags, SBSCN_HW_CONSOLE)) 524 #if 0 /* DO NOT turn on break interrupt at this time. */ 525 ch->ch_imr = 0x04; /* interrupt on break */ 526 #else 527 ch->ch_imr = 0x00; 528 #endif 529 else 530 #endif 531 ch->ch_imr = 0; 532 WRITE_REG(ch->ch_imr_base, ch->ch_imr); 533 534 splx(s); 535 } 536 537 int 538 sbscnopen(dev_t dev, int flag, int mode, struct lwp *l) 539 { 540 int chan = SBSCN_CHAN(dev); 541 struct sbscn_softc *sc; 542 struct sbscn_channel *ch; 543 struct tty *tp; 544 int s, s2; 545 int error; 546 547 sc = device_lookup_private(&sbscn_cd, SBSCN_UNIT(dev)); 548 if (sc == NULL) 549 return (ENXIO); 550 ch = &sc->sc_channels[chan]; 551 if (!ISSET(ch->ch_hwflags, SBSCN_HW_DEV_OK) || ch->ch_rbuf == NULL) 552 return (ENXIO); 553 554 #ifdef KGDB 555 /* 556 * If this is the kgdb port, no other use is permitted. 557 */ 558 if (ISSET(ch->ch_hwflags, SBSCN_HW_KGDB)) 559 return (EBUSY); 560 #endif 561 562 tp = ch->ch_tty; 563 564 if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp)) 565 return (EBUSY); 566 567 s = spltty(); 568 569 /* 570 * Do the following iff this is a first open. 571 */ 572 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 573 struct termios t; 574 575 tp->t_dev = dev; 576 577 s2 = splserial(); 578 579 /* Turn on receive, break, and status change interrupts. */ 580 #if 0 /* DO NOT turn on break or status change interrupt at this time. */ 581 ch->ch_imr = 0xe; 582 #else 583 ch->ch_imr = 0x2; 584 #endif 585 WRITE_REG(ch->ch_imr_base, ch->ch_imr); 586 587 /* Fetch the current modem control status, needed later. */ 588 ch->ch_iports = GET_INPUT_SIGNALS(ch); 589 ch->ch_iports_delta = 0; 590 splx(s2); 591 592 /* 593 * Initialize the termios status to the defaults. Add in the 594 * sticky bits from TIOCSFLAGS. 595 */ 596 t.c_ispeed = 0; 597 if (ISSET(ch->ch_hwflags, SBSCN_HW_CONSOLE)) { 598 t.c_ospeed = sbscn_cons_rate; 599 t.c_cflag = sbscn_cons_cflag; 600 } else { 601 t.c_ospeed = TTYDEF_SPEED; 602 t.c_cflag = TTYDEF_CFLAG; 603 } 604 if (ISSET(ch->ch_swflags, TIOCFLAG_CLOCAL)) 605 SET(t.c_cflag, CLOCAL); 606 if (ISSET(ch->ch_swflags, TIOCFLAG_CRTSCTS)) 607 SET(t.c_cflag, CRTSCTS); 608 if (ISSET(ch->ch_swflags, TIOCFLAG_MDMBUF)) 609 SET(t.c_cflag, MDMBUF); 610 /* Make sure sbscn_param() will do something. */ 611 tp->t_ospeed = 0; 612 (void) sbscn_param(tp, &t); 613 tp->t_iflag = TTYDEF_IFLAG; 614 tp->t_oflag = TTYDEF_OFLAG; 615 tp->t_lflag = TTYDEF_LFLAG; 616 ttychars(tp); 617 ttsetwater(tp); 618 619 s2 = splserial(); 620 621 /* 622 * Turn on DTR. We must always do this, even if carrier is not 623 * present, because otherwise we'd have to use TIOCSDTR 624 * immediately after setting CLOCAL, which applications do not 625 * expect. We always assert DTR while the device is open 626 * unless explicitly requested to deassert it. 627 */ 628 sbscn_modem(ch, 1); 629 630 /* Clear the input ring, and unblock. */ 631 ch->ch_rbput = ch->ch_rbget = ch->ch_rbuf; 632 ch->ch_rbavail = sbscn_rbuf_size; 633 sbscn_iflush(ch); 634 CLR(ch->ch_rx_flags, RX_ANY_BLOCK); 635 sbscn_dohwiflow(ch); 636 637 #ifdef SBSCN_DEBUG 638 if (sbscn_debug) 639 sbscn_status(ch, "sbscnopen "); 640 #endif 641 642 splx(s2); 643 } 644 645 splx(s); 646 647 error = ttyopen(tp, SBSCN_DIALOUT(dev), ISSET(flag, O_NONBLOCK)); 648 if (error) 649 goto bad; 650 651 error = (*tp->t_linesw->l_open)(dev, tp); 652 if (error) 653 goto bad; 654 655 return (0); 656 657 bad: 658 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 659 /* 660 * We failed to open the device, and nobody else had it opened. 661 * Clean up the state as appropriate. 662 */ 663 sbscn_shutdown(ch); 664 } 665 666 return (error); 667 } 668 669 int 670 sbscnclose(dev_t dev, int flag, int mode, struct lwp *l) 671 { 672 struct sbscn_softc *sc = device_lookup_private(&sbscn_cd, SBSCN_UNIT(dev)); 673 struct sbscn_channel *ch = &sc->sc_channels[SBSCN_CHAN(dev)]; 674 struct tty *tp = ch->ch_tty; 675 676 /* XXX This is for cons.c. */ 677 if (!ISSET(tp->t_state, TS_ISOPEN)) 678 return (0); 679 680 (*tp->t_linesw->l_close)(tp, flag); 681 ttyclose(tp); 682 683 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 684 /* 685 * Although we got a last close, the device may still be in 686 * use; e.g. if this was the dialout node, and there are still 687 * processes waiting for carrier on the non-dialout node. 688 */ 689 sbscn_shutdown(ch); 690 } 691 692 return (0); 693 } 694 695 int 696 sbscnread(dev_t dev, struct uio *uio, int flag) 697 { 698 struct sbscn_softc *sc = device_lookup_private(&sbscn_cd, SBSCN_UNIT(dev)); 699 struct sbscn_channel *ch = &sc->sc_channels[SBSCN_CHAN(dev)]; 700 struct tty *tp = ch->ch_tty; 701 702 return ((*tp->t_linesw->l_read)(tp, uio, flag)); 703 } 704 705 int 706 sbscnwrite(dev_t dev, struct uio *uio, int flag) 707 { 708 struct sbscn_softc *sc = device_lookup_private(&sbscn_cd, SBSCN_UNIT(dev)); 709 struct sbscn_channel *ch = &sc->sc_channels[SBSCN_CHAN(dev)]; 710 struct tty *tp = ch->ch_tty; 711 712 return ((*tp->t_linesw->l_write)(tp, uio, flag)); 713 } 714 715 int 716 sbscnpoll(dev_t dev, int events, struct lwp *l) 717 { 718 struct sbscn_softc *sc = device_lookup_private(&sbscn_cd, SBSCN_UNIT(dev)); 719 struct sbscn_channel *ch = &sc->sc_channels[SBSCN_CHAN(dev)]; 720 struct tty *tp = ch->ch_tty; 721 722 return ((*tp->t_linesw->l_poll)(tp, events, l)); 723 } 724 725 struct tty * 726 sbscntty(dev_t dev) 727 { 728 struct sbscn_softc *sc = device_lookup_private(&sbscn_cd, SBSCN_UNIT(dev)); 729 struct sbscn_channel *ch = &sc->sc_channels[SBSCN_CHAN(dev)]; 730 struct tty *tp = ch->ch_tty; 731 732 return (tp); 733 } 734 735 int 736 sbscnioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 737 { 738 struct sbscn_softc *sc = device_lookup_private(&sbscn_cd, SBSCN_UNIT(dev)); 739 struct sbscn_channel *ch = &sc->sc_channels[SBSCN_CHAN(dev)]; 740 struct tty *tp = ch->ch_tty; 741 int error; 742 int s; 743 744 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 745 if (error != EPASSTHROUGH) 746 return (error); 747 748 error = ttioctl(tp, cmd, data, flag, l); 749 if (error != EPASSTHROUGH) 750 return (error); 751 752 error = 0; 753 754 s = splserial(); 755 756 switch (cmd) { 757 case TIOCSBRK: 758 sbscn_break(ch, 1); 759 break; 760 761 case TIOCCBRK: 762 sbscn_break(ch, 0); 763 break; 764 765 case TIOCSDTR: 766 sbscn_modem(ch, 1); 767 break; 768 769 case TIOCCDTR: 770 sbscn_modem(ch, 0); 771 break; 772 773 case TIOCGFLAGS: 774 *(int *)data = ch->ch_swflags; 775 break; 776 777 case TIOCSFLAGS: 778 error = kauth_authorize_device_tty(l->l_cred, 779 KAUTH_DEVICE_TTY_PRIVSET, tp); 780 if (error) 781 break; 782 ch->ch_swflags = *(int *)data; 783 break; 784 785 case TIOCMSET: 786 case TIOCMBIS: 787 case TIOCMBIC: 788 tiocm_to_sbscn(ch, cmd, *(int *)data); 789 break; 790 791 case TIOCMGET: 792 *(int *)data = sbscn_to_tiocm(ch); 793 break; 794 795 default: 796 error = EPASSTHROUGH; 797 break; 798 } 799 800 splx(s); 801 802 #ifdef SBSCN_DEBUG 803 if (sbscn_debug) 804 sbscn_status(ch, "sbscn_ioctl "); 805 #endif 806 807 return (error); 808 } 809 810 integrate void 811 sbscn_schedrx(struct sbscn_channel *ch) 812 { 813 814 ch->ch_rx_ready = 1; 815 816 /* Wake up the poller. */ 817 softint_schedule(ch->ch_si); 818 } 819 820 void 821 sbscn_break(struct sbscn_channel *ch, int onoff) 822 { 823 824 /* XXXCGD delay break until not busy */ 825 if (onoff) 826 WRITE_REG(ch->ch_base + 0x50, 0x60); 827 else 828 WRITE_REG(ch->ch_base + 0x50, 0x70); 829 830 #if 0 831 if (!ch->ch_heldchange) { 832 if (ch->ch_tx_busy) { 833 ch->ch_heldtbc = ch->ch_tbc; 834 ch->ch_tbc = 0; 835 ch->ch_heldchange = 1; 836 } else 837 sbscn_loadchannelregs(ch); 838 } 839 #endif 840 } 841 842 void 843 sbscn_modem(struct sbscn_channel *ch, int onoff) 844 { 845 846 if (ch->ch_o_dtr == 0) 847 return; 848 849 if (onoff) 850 SET(ch->ch_oports, ch->ch_o_dtr); 851 else 852 CLR(ch->ch_oports, ch->ch_o_dtr); 853 854 if (!ch->ch_heldchange) { 855 if (ch->ch_tx_busy) { 856 ch->ch_heldtbc = ch->ch_tbc; 857 ch->ch_tbc = 0; 858 ch->ch_heldchange = 1; 859 } else 860 sbscn_loadchannelregs(ch); 861 } 862 } 863 864 void 865 tiocm_to_sbscn(struct sbscn_channel *ch, int how, int ttybits) 866 { 867 u_char bits; 868 869 bits = 0; 870 if (ISSET(ttybits, TIOCM_DTR)) 871 SET(bits, ch->ch_o_dtr); 872 if (ISSET(ttybits, TIOCM_RTS)) 873 SET(bits, ch->ch_o_rts); 874 875 switch (how) { 876 case TIOCMBIC: 877 CLR(ch->ch_oports, bits); 878 break; 879 880 case TIOCMBIS: 881 SET(ch->ch_oports, bits); 882 break; 883 884 case TIOCMSET: 885 ch->ch_oports = bits; 886 break; 887 } 888 889 if (!ch->ch_heldchange) { 890 if (ch->ch_tx_busy) { 891 ch->ch_heldtbc = ch->ch_tbc; 892 ch->ch_tbc = 0; 893 ch->ch_heldchange = 1; 894 } else 895 sbscn_loadchannelregs(ch); 896 } 897 } 898 899 int 900 sbscn_to_tiocm(struct sbscn_channel *ch) 901 { 902 u_char hwbits; 903 int ttybits = 0; 904 905 hwbits = ch->ch_oports; 906 if (ISSET(hwbits, ch->ch_o_dtr)) 907 SET(ttybits, TIOCM_DTR); 908 if (ISSET(hwbits, ch->ch_o_rts)) 909 SET(ttybits, TIOCM_RTS); 910 911 hwbits = ch->ch_iports; 912 if (ISSET(hwbits, ch->ch_i_dcd)) 913 SET(ttybits, TIOCM_CD); 914 if (ISSET(hwbits, ch->ch_i_cts)) 915 SET(ttybits, TIOCM_CTS); 916 if (ISSET(hwbits, ch->ch_i_dsr)) 917 SET(ttybits, TIOCM_DSR); 918 if (ISSET(hwbits, ch->ch_i_ri)) 919 SET(ttybits, TIOCM_RI); 920 921 if (ch->ch_imr != 0) 922 SET(ttybits, TIOCM_LE); 923 924 return (ttybits); 925 } 926 927 static int 928 cflag2modes(cflag, mode1p, mode2p) 929 tcflag_t cflag; 930 u_char *mode1p; 931 u_char *mode2p; 932 { 933 u_char mode1; 934 u_char mode2; 935 int err = 0; 936 937 mode1 = mode2 = 0; 938 939 switch (ISSET(cflag, CSIZE)) { 940 case CS7: 941 mode1 |= 2; /* XXX */ 942 break; 943 default: 944 err = -1; 945 /* FALLTHRU for sanity */ 946 case CS8: 947 mode1 |= 3; /* XXX */ 948 break; 949 } 950 if (!ISSET(cflag, PARENB)) 951 mode1 |= 2 << 3; 952 else { 953 mode1 |= 0 << 3; 954 if (ISSET(cflag, PARODD)) 955 mode1 |= 1 << 2; 956 } 957 958 if (ISSET(cflag, CSTOPB)) 959 mode2 |= 1 << 3; /* two stop bits XXX not std */ 960 961 if (ISSET(cflag, CRTSCTS)) { 962 mode1 |= 1 << 7; 963 mode2 |= 1 << 4; 964 } 965 966 *mode1p = mode1; 967 *mode2p = mode2; 968 return (err); 969 } 970 971 int 972 sbscn_param(struct tty *tp, struct termios *t) 973 { 974 struct sbscn_softc *sc = device_lookup_private(&sbscn_cd, SBSCN_UNIT(tp->t_dev)); 975 struct sbscn_channel *ch = &sc->sc_channels[SBSCN_CHAN(tp->t_dev)]; 976 long brc; 977 u_char mode1, mode2; 978 int s; 979 980 /* XXX reset to console parameters if console? */ 981 #if 0 982 XXX disable, enable. 983 #endif 984 985 /* Check requested parameters. */ 986 if (sbscn_speed(t->c_ospeed, &brc) < 0) 987 return (EINVAL); 988 if (t->c_ispeed && t->c_ispeed != t->c_ospeed) 989 return (EINVAL); 990 991 /* 992 * For the console, always force CLOCAL and !HUPCL, so that the port 993 * is always active. 994 */ 995 if (ISSET(ch->ch_swflags, TIOCFLAG_SOFTCAR) || 996 ISSET(ch->ch_hwflags, SBSCN_HW_CONSOLE)) { 997 SET(t->c_cflag, CLOCAL); 998 CLR(t->c_cflag, HUPCL); 999 } 1000 1001 /* 1002 * If there were no changes, don't do anything. This avoids dropping 1003 * input and improves performance when all we did was frob things like 1004 * VMIN and VTIME. 1005 */ 1006 if (tp->t_ospeed == t->c_ospeed && 1007 tp->t_cflag == t->c_cflag) 1008 return (0); 1009 1010 if (cflag2modes(t->c_cflag, &mode1, &mode2) < 0) 1011 return (EINVAL); 1012 1013 s = splserial(); 1014 1015 ch->ch_mode1 = mode1; 1016 ch->ch_mode2 = mode2; 1017 1018 /* 1019 * If we're not in a mode that assumes a connection is present, then 1020 * ignore carrier changes. 1021 */ 1022 if (ISSET(t->c_cflag, CLOCAL | MDMBUF)) 1023 ch->ch_i_dcd = 0; 1024 else 1025 ch->ch_i_dcd = ch->ch_i_dcd_pin; 1026 /* 1027 * Set the flow control pins depending on the current flow control 1028 * mode. 1029 */ 1030 if (ISSET(t->c_cflag, CRTSCTS)) { 1031 ch->ch_o_dtr = ch->ch_o_dtr_pin; 1032 ch->ch_o_rts = ch->ch_o_rts_pin; 1033 ch->ch_i_cts = ch->ch_i_cts_pin; 1034 /* hw controle enable bits in mod regs set by cflag2modes */ 1035 } else if (ISSET(t->c_cflag, MDMBUF)) { 1036 /* 1037 * For DTR/DCD flow control, make sure we don't toggle DTR for 1038 * carrier detection. 1039 */ 1040 ch->ch_o_dtr = 0; 1041 ch->ch_o_rts = ch->ch_o_dtr_pin; 1042 ch->ch_i_cts = ch->ch_i_dcd_pin; 1043 } else { 1044 /* 1045 * If no flow control, then always set RTS. This will make 1046 * the other side happy if it mistakenly thinks we're doing 1047 * RTS/CTS flow control. 1048 */ 1049 ch->ch_o_dtr = ch->ch_o_dtr_pin | ch->ch_o_rts_pin; 1050 ch->ch_o_rts = 0; 1051 ch->ch_i_cts = 0; 1052 if (ISSET(ch->ch_oports, ch->ch_o_dtr_pin)) 1053 SET(ch->ch_oports, ch->ch_o_rts_pin); 1054 else 1055 CLR(ch->ch_oports, ch->ch_o_rts_pin); 1056 } 1057 /* XXX maybe mask the ports which generate intrs? */ 1058 1059 ch->ch_brc = brc; 1060 1061 /* XXX maybe set fifo-full receive mode if RTSCTS and high speed? */ 1062 1063 /* And copy to tty. */ 1064 tp->t_ispeed = 0; 1065 tp->t_ospeed = t->c_ospeed; 1066 tp->t_cflag = t->c_cflag; 1067 1068 if (!ch->ch_heldchange) { 1069 if (ch->ch_tx_busy) { 1070 ch->ch_heldtbc = ch->ch_tbc; 1071 ch->ch_tbc = 0; 1072 ch->ch_heldchange = 1; 1073 } else 1074 sbscn_loadchannelregs(ch); 1075 } 1076 1077 if (!ISSET(t->c_cflag, CHWFLOW)) { 1078 /* Disable the high water mark. */ 1079 ch->ch_r_hiwat = 0; 1080 ch->ch_r_lowat = 0; 1081 if (ISSET(ch->ch_rx_flags, RX_TTY_OVERFLOWED)) { 1082 CLR(ch->ch_rx_flags, RX_TTY_OVERFLOWED); 1083 sbscn_schedrx(ch); 1084 } 1085 if (ISSET(ch->ch_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 1086 CLR(ch->ch_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 1087 sbscn_dohwiflow(ch); 1088 } 1089 } else { 1090 ch->ch_r_hiwat = sbscn_rbuf_hiwat; 1091 ch->ch_r_lowat = sbscn_rbuf_lowat; 1092 } 1093 1094 splx(s); 1095 1096 /* 1097 * Update the tty layer's idea of the carrier bit, in case we changed 1098 * CLOCAL or MDMBUF. We don't hang up here; we only do that by 1099 * explicit request. 1100 */ 1101 (void) (*tp->t_linesw->l_modem)(tp, 1102 ISSET(ch->ch_iports, ch->ch_i_dcd)); 1103 1104 #ifdef SBSCN_DEBUG 1105 if (sbscn_debug) 1106 sbscn_status(ch, "sbscnparam "); 1107 #endif 1108 1109 if (!ISSET(t->c_cflag, CHWFLOW)) { 1110 if (ch->ch_tx_stopped) { 1111 ch->ch_tx_stopped = 0; 1112 sbscn_start(tp); 1113 } 1114 } 1115 1116 return (0); 1117 } 1118 1119 void 1120 sbscn_iflush(struct sbscn_channel *ch) 1121 { 1122 #ifdef DIAGNOSTIC 1123 int reg; 1124 #endif 1125 int timo; 1126 1127 #ifdef DIAGNOSTIC 1128 reg = 0xffff; 1129 #endif 1130 timo = 50000; 1131 /* flush any pending I/O */ 1132 while (ISSET(READ_REG(ch->ch_base + 0x20), 0x01) 1133 && --timo) 1134 #ifdef DIAGNOSTIC 1135 reg = 1136 #else 1137 (void) 1138 #endif 1139 READ_REG(ch->ch_base + 0x60); 1140 #ifdef DIAGNOSTIC 1141 if (!timo) 1142 printf("%s: sbscn_iflush timeout %02x\n", 1143 ch->ch_sc->sc_dev.dv_xname, reg & 0xff); 1144 #endif 1145 } 1146 1147 void 1148 sbscn_loadchannelregs(struct sbscn_channel *ch) 1149 { 1150 1151 /* XXXXX necessary? */ 1152 sbscn_iflush(ch); 1153 1154 WRITE_REG(ch->ch_imr_base, 0); 1155 1156 // XXX disable? 1157 WRITE_REG(ch->ch_base + 0x00, ch->ch_mode1); 1158 WRITE_REG(ch->ch_base + 0x10, ch->ch_mode2); 1159 WRITE_REG(ch->ch_base + 0x30, ch->ch_brc); 1160 1161 ch->ch_oports_active = ch->ch_oports; 1162 SET_OUTPUT_SIGNALS(ch, ch->ch_oports_active); 1163 1164 WRITE_REG(ch->ch_imr_base, ch->ch_imr); 1165 } 1166 1167 int 1168 sbscn_hwiflow(struct tty *tp, int block) 1169 { 1170 struct sbscn_softc *sc = device_lookup_private(&sbscn_cd, SBSCN_UNIT(tp->t_dev)); 1171 struct sbscn_channel *ch = &sc->sc_channels[SBSCN_CHAN(tp->t_dev)]; 1172 int s; 1173 1174 if (ch->ch_o_rts == 0) 1175 return (0); 1176 1177 s = splserial(); 1178 if (block) { 1179 if (!ISSET(ch->ch_rx_flags, RX_TTY_BLOCKED)) { 1180 SET(ch->ch_rx_flags, RX_TTY_BLOCKED); 1181 sbscn_dohwiflow(ch); 1182 } 1183 } else { 1184 if (ISSET(ch->ch_rx_flags, RX_TTY_OVERFLOWED)) { 1185 CLR(ch->ch_rx_flags, RX_TTY_OVERFLOWED); 1186 sbscn_schedrx(ch); 1187 } 1188 if (ISSET(ch->ch_rx_flags, RX_TTY_BLOCKED)) { 1189 CLR(ch->ch_rx_flags, RX_TTY_BLOCKED); 1190 sbscn_dohwiflow(ch); 1191 } 1192 } 1193 splx(s); 1194 return (1); 1195 } 1196 1197 /* 1198 * (un)block input via hw flowcontrol 1199 */ 1200 void 1201 sbscn_dohwiflow(struct sbscn_channel *ch) 1202 { 1203 1204 if (ch->ch_o_rts == 0) 1205 return; 1206 1207 if (ISSET(ch->ch_rx_flags, RX_ANY_BLOCK)) { 1208 CLR(ch->ch_oports, ch->ch_o_rts); 1209 CLR(ch->ch_oports_active, ch->ch_o_rts); 1210 } else { 1211 SET(ch->ch_oports, ch->ch_o_rts); 1212 SET(ch->ch_oports_active, ch->ch_o_rts); 1213 } 1214 SET_OUTPUT_SIGNALS(ch, ch->ch_oports_active); 1215 } 1216 1217 void 1218 sbscn_start(struct tty *tp) 1219 { 1220 struct sbscn_softc *sc = device_lookup_private(&sbscn_cd, SBSCN_UNIT(tp->t_dev)); 1221 struct sbscn_channel *ch = &sc->sc_channels[SBSCN_CHAN(tp->t_dev)]; 1222 int s; 1223 1224 s = spltty(); 1225 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 1226 goto out; 1227 if (ch->ch_tx_stopped) 1228 goto out; 1229 if (!ttypull(tp)) 1230 goto out; 1231 1232 /* Grab the first contiguous region of buffer space. */ 1233 { 1234 u_char *tba; 1235 int tbc; 1236 1237 tba = tp->t_outq.c_cf; 1238 tbc = ndqb(&tp->t_outq, 0); 1239 1240 (void)splserial(); 1241 1242 ch->ch_tba = tba; 1243 ch->ch_tbc = tbc; 1244 } 1245 1246 SET(tp->t_state, TS_BUSY); 1247 ch->ch_tx_busy = 1; 1248 1249 /* Enable transmit completion interrupts if necessary. */ 1250 if (!ISSET(ch->ch_imr, 0x1)) { 1251 SET(ch->ch_imr, 0x1); 1252 WRITE_REG(ch->ch_imr_base, ch->ch_imr); 1253 } 1254 1255 /* Output the first chunk of the contiguous buffer. */ 1256 { 1257 u_char c; 1258 1259 while (ch->ch_tbc && READ_REG(ch->ch_base + 0x20) & 0x04) { 1260 c = *ch->ch_tba++; 1261 ch->ch_tbc--; 1262 WRITE_REG(ch->ch_base + 0x70, c); 1263 } 1264 } 1265 out: 1266 splx(s); 1267 return; 1268 } 1269 1270 /* 1271 * Stop output on a line. 1272 */ 1273 void 1274 sbscnstop(struct tty *tp, int flag) 1275 { 1276 struct sbscn_softc *sc = device_lookup_private(&sbscn_cd, SBSCN_UNIT(tp->t_dev)); 1277 struct sbscn_channel *ch = &sc->sc_channels[SBSCN_CHAN(tp->t_dev)]; 1278 int s; 1279 1280 s = splserial(); 1281 if (ISSET(tp->t_state, TS_BUSY)) { 1282 /* Stop transmitting at the next chunk. */ 1283 ch->ch_tbc = 0; 1284 ch->ch_heldtbc = 0; 1285 if (!ISSET(tp->t_state, TS_TTSTOP)) 1286 SET(tp->t_state, TS_FLUSH); 1287 } 1288 splx(s); 1289 } 1290 1291 void 1292 sbscn_diag(void *arg) 1293 { 1294 struct sbscn_channel *ch = arg; 1295 struct sbscn_softc *sc = ch->ch_sc; 1296 int overflows, floods; 1297 int s; 1298 1299 s = splserial(); 1300 overflows = ch->ch_overflows; 1301 ch->ch_overflows = 0; 1302 floods = ch->ch_floods; 1303 ch->ch_floods = 0; 1304 ch->ch_errors = 0; 1305 splx(s); 1306 1307 log(LOG_WARNING, "%s: channel %d: %d fifo overflow%s, %d ibuf flood%s\n", 1308 sc->sc_dev.dv_xname, ch->ch_num, 1309 overflows, overflows == 1 ? "" : "s", 1310 floods, floods == 1 ? "" : "s"); 1311 } 1312 1313 integrate void 1314 sbscn_rxsoft(struct sbscn_channel *ch, struct tty *tp) 1315 { 1316 int (*rint)(int, struct tty *) = tp->t_linesw->l_rint; 1317 u_char *get, *end; 1318 u_int cc, scc; 1319 u_char sr; 1320 int code; 1321 int s; 1322 1323 end = ch->ch_ebuf; 1324 get = ch->ch_rbget; 1325 scc = cc = sbscn_rbuf_size - ch->ch_rbavail; 1326 1327 if (cc == sbscn_rbuf_size) { 1328 ch->ch_floods++; 1329 if (ch->ch_errors++ == 0) 1330 callout_reset(&ch->ch_diag_callout, 60 * hz, 1331 sbscn_diag, ch); 1332 } 1333 1334 while (cc) { 1335 code = get[0]; 1336 sr = get[1]; 1337 if (ISSET(sr, 0xf0)) { 1338 if (ISSET(sr, 0x10)) { 1339 ch->ch_overflows++; 1340 if (ch->ch_errors++ == 0) 1341 callout_reset(&ch->ch_diag_callout, 1342 60 * hz, sbscn_diag, ch); 1343 } 1344 if (ISSET(sr, 0xc0)) 1345 SET(code, TTY_FE); 1346 if (ISSET(sr, 0x20)) 1347 SET(code, TTY_PE); 1348 } 1349 if ((*rint)(code, tp) == -1) { 1350 /* 1351 * The line discipline's buffer is out of space. 1352 */ 1353 if (!ISSET(ch->ch_rx_flags, RX_TTY_BLOCKED)) { 1354 /* 1355 * We're either not using flow control, or the 1356 * line discipline didn't tell us to block for 1357 * some reason. Either way, we have no way to 1358 * know when there's more space available, so 1359 * just drop the rest of the data. 1360 */ 1361 get += cc << 1; 1362 if (get >= end) 1363 get -= sbscn_rbuf_size << 1; 1364 cc = 0; 1365 } else { 1366 /* 1367 * Don't schedule any more receive processing 1368 * until the line discipline tells us there's 1369 * space available (through comhwiflow()). 1370 * Leave the rest of the data in the input 1371 * buffer. 1372 */ 1373 SET(ch->ch_rx_flags, RX_TTY_OVERFLOWED); 1374 } 1375 break; 1376 } 1377 get += 2; 1378 if (get >= end) 1379 get = ch->ch_rbuf; 1380 cc--; 1381 } 1382 1383 if (cc != scc) { 1384 ch->ch_rbget = get; 1385 s = splserial(); 1386 cc = ch->ch_rbavail += scc - cc; 1387 /* Buffers should be ok again, release possible block. */ 1388 if (cc >= ch->ch_r_lowat) { 1389 if (ISSET(ch->ch_rx_flags, RX_IBUF_OVERFLOWED)) { 1390 CLR(ch->ch_rx_flags, RX_IBUF_OVERFLOWED); 1391 SET(ch->ch_imr, 0x02); 1392 WRITE_REG(ch->ch_imr_base, ch->ch_imr); 1393 } 1394 if (ISSET(ch->ch_rx_flags, RX_IBUF_BLOCKED)) { 1395 CLR(ch->ch_rx_flags, RX_IBUF_BLOCKED); 1396 sbscn_dohwiflow(ch); 1397 } 1398 } 1399 splx(s); 1400 } 1401 } 1402 1403 integrate void 1404 sbscn_txsoft(struct sbscn_channel *ch, struct tty *tp) 1405 { 1406 1407 CLR(tp->t_state, TS_BUSY); 1408 if (ISSET(tp->t_state, TS_FLUSH)) 1409 CLR(tp->t_state, TS_FLUSH); 1410 else 1411 ndflush(&tp->t_outq, (int)(ch->ch_tba - tp->t_outq.c_cf)); 1412 (*tp->t_linesw->l_start)(tp); 1413 } 1414 1415 integrate void 1416 sbscn_stsoft(struct sbscn_channel *ch, struct tty *tp) 1417 { 1418 u_char iports, delta; 1419 int s; 1420 1421 s = splserial(); 1422 iports = ch->ch_iports; 1423 delta = ch->ch_iports_delta; 1424 ch->ch_iports_delta = 0; 1425 splx(s); 1426 1427 if (ISSET(delta, ch->ch_i_dcd)) { 1428 /* 1429 * Inform the tty layer that carrier detect changed. 1430 */ 1431 (void) (*tp->t_linesw->l_modem)(tp, 1432 ISSET(iports, ch->ch_i_dcd)); 1433 } 1434 1435 if (ISSET(delta, ch->ch_i_cts)) { 1436 /* Block or unblock output according to flow control. */ 1437 if (ISSET(iports, ch->ch_i_cts)) { 1438 ch->ch_tx_stopped = 0; 1439 (*tp->t_linesw->l_start)(tp); 1440 } else { 1441 ch->ch_tx_stopped = 1; 1442 } 1443 } 1444 1445 #ifdef SBSCN_DEBUG 1446 if (sbscn_debug) 1447 sbscn_status(ch, "sbscn_stsoft"); 1448 #endif 1449 } 1450 1451 void 1452 sbscn_soft(void *arg) 1453 { 1454 struct sbscn_channel *ch = arg; 1455 struct tty *tp = ch->ch_tty; 1456 1457 if (ch->ch_rx_ready) { 1458 ch->ch_rx_ready = 0; 1459 sbscn_rxsoft(ch, tp); 1460 } 1461 1462 if (ch->ch_st_check) { 1463 ch->ch_st_check = 0; 1464 sbscn_stsoft(ch, tp); 1465 } 1466 1467 if (ch->ch_tx_done) { 1468 ch->ch_tx_done = 0; 1469 sbscn_txsoft(ch, tp); 1470 } 1471 } 1472 1473 void 1474 sbscn_intr(void *arg, uint32_t status, uint32_t pc) 1475 { 1476 struct sbscn_channel *ch = arg; 1477 u_char *put, *end; 1478 u_int cc; 1479 u_char isr, sr; 1480 1481 /* read ISR */ 1482 isr = READ_REG(ch->ch_isr_base) & ch->ch_imr; 1483 if (isr == 0) 1484 return; 1485 1486 end = ch->ch_ebuf; 1487 put = ch->ch_rbput; 1488 cc = ch->ch_rbavail; 1489 1490 do { 1491 u_char iports, delta; 1492 1493 if (isr & 0x02) { 1494 1495 sr = READ_REG(ch->ch_base + 0x20); 1496 /* XXX sr 0x01 bit must be set at this point */ 1497 1498 #if defined(DDB) || defined(KGDB) 1499 if ((sr & 0x80) == 0x80) { 1500 #ifdef DDB 1501 if (ISSET(ch->ch_hwflags, SBSCN_HW_CONSOLE)) { 1502 (void)READ_REG(ch->ch_base + 0x60); 1503 console_debugger(); 1504 continue; 1505 } 1506 #endif 1507 #ifdef KGDB 1508 if (ISSET(ch->ch_hwflags, SBSCN_HW_KGDB)) { 1509 (void)READ_REG(ch->ch_base + 0x60); 1510 kgdb_connect(1); 1511 continue; 1512 } 1513 #endif 1514 } 1515 #endif /* DDB || KGDB */ 1516 1517 if (!ISSET(ch->ch_rx_flags, RX_IBUF_OVERFLOWED)) { 1518 while (cc > 0) { 1519 put[0] = READ_REG(ch->ch_base + 0x60); 1520 put[1] = sr; 1521 put += 2; 1522 if (put >= end) 1523 put = ch->ch_rbuf; 1524 cc--; 1525 1526 sr = READ_REG(ch->ch_base + 0x20); 1527 if (!ISSET(sr, 0x02)) 1528 break; 1529 } 1530 1531 /* 1532 * Current string of incoming characters ended 1533 * because no more data was available or we 1534 * ran out of space. Schedule a receive event 1535 * if any data was received. If we're out of 1536 * space, turn off receive interrupts. 1537 */ 1538 ch->ch_rbput = put; 1539 ch->ch_rbavail = cc; 1540 if (!ISSET(ch->ch_rx_flags, RX_TTY_OVERFLOWED)) 1541 ch->ch_rx_ready = 1; 1542 1543 /* 1544 * See if we are in danger of overflowing a 1545 * buffer. If so, use hardware flow control 1546 * to ease the pressure. 1547 */ 1548 if (!ISSET(ch->ch_rx_flags, RX_IBUF_BLOCKED) && 1549 cc < ch->ch_r_hiwat) { 1550 SET(ch->ch_rx_flags, RX_IBUF_BLOCKED); 1551 sbscn_dohwiflow(ch); 1552 } 1553 1554 /* 1555 * If we're out of space, disable receive 1556 * interrupts until the queue has drained 1557 * a bit. 1558 */ 1559 if (!cc) { 1560 SET(ch->ch_rx_flags, 1561 RX_IBUF_OVERFLOWED); 1562 CLR(ch->ch_imr, 0x02); 1563 WRITE_REG(ch->ch_imr_base, ch->ch_imr); 1564 } 1565 } else { 1566 /* XXX panic? */ 1567 CLR(ch->ch_imr, 0x02); 1568 WRITE_REG(ch->ch_imr_base, ch->ch_imr); 1569 continue; 1570 } 1571 } 1572 1573 if (isr & 0x01) { 1574 CLR(ch->ch_imr, 0x01); 1575 WRITE_REG(ch->ch_imr_base, ch->ch_imr); 1576 } 1577 1578 #if 0 1579 XXX 1580 if (isr & 0x08) { 1581 clear input signal change! 1582 } 1583 #endif 1584 iports = GET_INPUT_SIGNALS(ch); 1585 delta = iports ^ ch->ch_iports; 1586 ch->ch_iports = iports; 1587 1588 /* 1589 * Process normal status changes 1590 */ 1591 if (ISSET(delta, ch->ch_i_mask)) { 1592 SET(ch->ch_iports_delta, delta); 1593 1594 /* 1595 * Stop output immediately if we lose the output 1596 * flow control signal or carrier detect. 1597 */ 1598 if (ISSET(~iports, ch->ch_i_mask)) { 1599 ch->ch_tbc = 0; 1600 ch->ch_heldtbc = 0; 1601 #ifdef SBSCN_DEBUG 1602 if (sbscn_debug) 1603 sbscn_status(ch, "sbscn_intr "); 1604 #endif 1605 } 1606 1607 ch->ch_st_check = 1; 1608 } 1609 } while ((isr = (READ_REG(ch->ch_isr_base) & ch->ch_imr)) != 0); 1610 1611 /* 1612 * Done handling any receive interrupts and status changes, and 1613 * clearing the tx-ready interrupt if it was set. See if data can 1614 * be transmitted as well. Schedule tx done event if no data left 1615 * and tty was marked busy. 1616 */ 1617 sr = READ_REG(ch->ch_base + 0x20); 1618 if (ISSET(sr, 0x4)) { 1619 1620 /* 1621 * If we've delayed a parameter change, do it now, and restart 1622 * output. 1623 */ 1624 if (ch->ch_heldchange) { 1625 sbscn_loadchannelregs(ch); 1626 ch->ch_heldchange = 0; 1627 ch->ch_tbc = ch->ch_heldtbc; 1628 ch->ch_heldtbc = 0; 1629 } 1630 1631 /* Output the next chunk of the contiguous buffer, if any. */ 1632 if (ch->ch_tbc > 0) { 1633 int wrote1; 1634 u_char c; 1635 1636 wrote1 = 0; 1637 while (ch->ch_tbc && 1638 READ_REG(ch->ch_base + 0x20) & 0x04) { 1639 wrote1 = 1; 1640 c = *ch->ch_tba++; 1641 ch->ch_tbc--; 1642 WRITE_REG(ch->ch_base + 0x70, c); 1643 } 1644 if (wrote1) { 1645 SET(ch->ch_imr, 0x01); 1646 WRITE_REG(ch->ch_imr_base, ch->ch_imr); 1647 } 1648 } else { 1649 /* 1650 * transmit completion interrupts already disabled, 1651 * mark the channel tx state as done. 1652 */ 1653 if (ch->ch_tx_busy) { 1654 ch->ch_tx_busy = 0; 1655 ch->ch_tx_done = 1; 1656 } 1657 } 1658 } 1659 1660 /* Wake up the poller. */ 1661 softint_schedule(ch->ch_si); 1662 1663 #if NRND > 0 && defined(RND_SBSCN) 1664 rnd_add_uint32(&ch->ch_rnd_source, isr | sr); 1665 #endif 1666 } 1667 1668 /* 1669 * The following functions are polled getc and putc routines, shared 1670 * by the console and kgdb glue. 1671 */ 1672 1673 int 1674 sbscn_common_getc(u_long addr, int chan) 1675 { 1676 int s = splhigh(); 1677 u_long base = MIPS_PHYS_TO_KSEG1(addr + (chan * 0x100)); 1678 int c; 1679 1680 /* block until a character becomes available */ 1681 while ((READ_REG(base + 0x20) & 0x01) == 0) 1682 continue; 1683 1684 c = READ_REG(base + 0x60) & 0xff; 1685 splx(s); 1686 return (c); 1687 } 1688 1689 void 1690 sbscn_common_putc(u_long addr, int chan, int c) 1691 { 1692 int s = splhigh(); 1693 int timo; 1694 u_long base = MIPS_PHYS_TO_KSEG1(addr + (chan * 0x100)); 1695 1696 /* wait for any pending transmission to finish */ 1697 timo = 1500000; 1698 while ((READ_REG(base + 0x20) & 0x08) == 0 && --timo) 1699 continue; 1700 1701 WRITE_REG(base + 0x70, c); 1702 1703 /* wait for this transmission to complete */ 1704 timo = 15000000; 1705 while ((READ_REG(base + 0x20) & 0x08) == 0 && --timo) 1706 continue; 1707 1708 splx(s); 1709 } 1710 1711 /* 1712 * Initialize UART for use as console or KGDB line. 1713 */ 1714 int 1715 sbscn_init(u_long addr, int chan, int rate, tcflag_t cflag) 1716 { 1717 #if 1 1718 u_long chanregbase = MIPS_PHYS_TO_KSEG1(addr + (chan * 0x100)); 1719 u_long imaskreg = MIPS_PHYS_TO_KSEG1(addr + 0x230 + (chan * 0x20)); 1720 u_char mode1, mode2; 1721 u_long brc; 1722 volatile int timo; 1723 1724 WRITE_REG(imaskreg, 0); /* disable channel intrs */ 1725 1726 /* XXX should we really do the following? how about only if enabled? */ 1727 /* wait for any pending transmission to finish */ 1728 timo = 1500000; 1729 while ((READ_REG(chanregbase + 0x20) & 0x08) == 0 && --timo) 1730 continue; 1731 1732 /* XXX: wait a little. THIS SHOULD NOT BE NECESSARY!!! (?) */ 1733 timo = 1500000; 1734 while (--timo) 1735 ; 1736 1737 WRITE_REG(chanregbase + 0x50, 2 << 4); /* reset receiver */ 1738 WRITE_REG(chanregbase + 0x50, 3 << 4); /* reset transmitter */ 1739 1740 /* set up the line for use */ 1741 (void)cflag2modes(cflag, &mode1, &mode2); 1742 (void)sbscn_speed(rate, &brc); 1743 WRITE_REG(chanregbase + 0x00, mode1); 1744 WRITE_REG(chanregbase + 0x10, mode2); 1745 WRITE_REG(chanregbase + 0x30, brc); 1746 1747 /* enable transmit and receive */ 1748 #define M_DUART_RX_EN 0x01 1749 #define M_DUART_TX_EN 0x04 1750 WRITE_REG(chanregbase + 0x50,M_DUART_RX_EN | M_DUART_TX_EN); 1751 #endif 1752 1753 /* XXX: wait a little. THIS SHOULD NOT BE NECESSARY!!! (?) */ 1754 timo = 1500000; 1755 while (--timo) 1756 ; 1757 1758 #if 0 /* XXXCGD */ 1759 bus_space_handle_t ioh; 1760 1761 if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) 1762 return (ENOMEM); /* ??? */ 1763 1764 bus_space_write_1(iot, ioh, com_lcr, LCR_EERS); 1765 bus_space_write_1(iot, ioh, com_efr, 0); 1766 bus_space_write_1(iot, ioh, com_lcr, LCR_DLAB); 1767 rate = comspeed(rate, frequency); 1768 bus_space_write_1(iot, ioh, com_dlbl, rate); 1769 bus_space_write_1(iot, ioh, com_dlbh, rate >> 8); 1770 bus_space_write_1(iot, ioh, com_lcr, cflag2lcr(cflag)); 1771 bus_space_write_1(iot, ioh, com_mcr, MCR_DTR | MCR_RTS); 1772 bus_space_write_1(iot, ioh, com_fifo, 1773 FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_1); 1774 bus_space_write_1(iot, ioh, com_ier, 0); 1775 1776 *iohp = ioh; 1777 return (0); 1778 #endif /* XXXCGD */ 1779 /* XXXCGD */ 1780 return (0); 1781 } 1782 1783 /* 1784 * Following are all routines needed for sbscn to act as console 1785 */ 1786 int 1787 sbscn_cnattach(u_long addr, int chan, int rate, tcflag_t cflag) 1788 { 1789 int res; 1790 static struct consdev sbscn_cons = { 1791 NULL, NULL, sbscn_cngetc, sbscn_cnputc, sbscn_cnpollc, NULL, 1792 NULL, NULL, NODEV, CN_NORMAL 1793 }; 1794 1795 res = sbscn_init(addr, chan, rate, cflag); 1796 if (res) 1797 return (res); 1798 1799 cn_tab = &sbscn_cons; 1800 1801 sbscn_cons_present = 1; 1802 sbscn_cons_addr = addr; 1803 sbscn_cons_chan = chan; 1804 sbscn_cons_rate = rate; 1805 sbscn_cons_cflag = cflag; 1806 1807 return (0); 1808 } 1809 1810 int 1811 sbscn_cngetc(dev_t dev) 1812 { 1813 1814 return (sbscn_common_getc(sbscn_cons_addr, sbscn_cons_chan)); 1815 } 1816 1817 /* 1818 * Console kernel output character routine. 1819 */ 1820 void 1821 sbscn_cnputc(dev_t dev, int c) 1822 { 1823 1824 sbscn_common_putc(sbscn_cons_addr, sbscn_cons_chan, c); 1825 } 1826 1827 void 1828 sbscn_cnpollc(dev_t dev, int on) 1829 { 1830 1831 } 1832 1833 #ifdef KGDB 1834 int 1835 sbscn_kgdb_attach(u_long addr, int chan, int rate, tcflag_t cflag) 1836 { 1837 int res; 1838 1839 if (!sbscn_cons_present && 1840 sbscn_cons_addr == addr && sbscn_cons_chan == chan) 1841 return (EBUSY); /* cannot share with console */ 1842 1843 res = sbscn_init(addr, chan, rate, cflag); 1844 if (res) 1845 return (res); 1846 1847 kgdb_attach(sbscn_kgdb_getc, sbscn_kgdb_putc, NULL); 1848 kgdb_dev = 123; /* unneeded, only to satisfy some tests */ 1849 1850 sbscn_kgdb_present = 1; 1851 sbscn_kgdb_addr = addr; 1852 sbscn_kgdb_chan = chan; 1853 1854 return (0); 1855 } 1856 1857 /* ARGSUSED */ 1858 int 1859 sbscn_kgdb_getc(arg) 1860 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(arg, c) 1869 void *arg; 1870 int c; 1871 { 1872 1873 sbscn_common_getc(sbscn_kgdb_addr, sbscn_kgdb_chan, c); 1874 } 1875 #endif /* KGDB */ 1876 1877 /* 1878 * helper function to identify the sbscn channels used by 1879 * console or KGDB (and not yet autoconf attached) 1880 */ 1881 int 1882 sbscn_is_console(u_long addr, int chan) 1883 { 1884 1885 if (sbscn_cons_present && !sbscn_cons_attached && 1886 sbscn_cons_addr == addr && sbscn_cons_chan == chan) 1887 return (1); 1888 #ifdef KGDB 1889 if (sbscn_kgdb_present && !sbscn_kgdb_attached && 1890 sbscn_kgdb_addr == addr && sbscn_kgdb_chan == chan) 1891 return (1); 1892 #endif 1893 return (0); 1894 } 1895
Indexes created Sun Sep 28 07:09:56 GMT 2025