1 /* $NetBSD: ixp12x0_com.c,v 1.37 2010/11/15 06:14:02 uebayasi Exp $ */ 2 /* 3 * Copyright (c) 1998, 1999, 2001, 2002 The NetBSD Foundation, Inc. 4 * All rights reserved. 5 * 6 * This code is derived from software contributed to The NetBSD Foundation 7 * by Ichiro FUKUHARA and Naoto Shimazaki. 8 * 9 * This code is derived from software contributed to The NetBSD Foundation 10 * by IWAMOTO Toshihiro. 11 * 12 * This code is derived from software contributed to The NetBSD Foundation 13 * by Charles M. Hannum. 14 * 15 * Redistribution and use in source and binary forms, with or without 16 * modification, are permitted provided that the following conditions 17 * are met: 18 * 1. Redistributions of source code must retain the above copyright 19 * notice, this list of conditions and the following disclaimer. 20 * 2. Redistributions in binary form must reproduce the above copyright 21 * notice, this list of conditions and the following disclaimer in the 22 * documentation and/or other materials provided with the distribution. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 25 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 26 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 27 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 28 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 34 * POSSIBILITY OF SUCH DAMAGE. 35 */ 36 37 /* 38 * Copyright (c) 1991 The Regents of the University of California. 39 * All rights reserved. 40 * 41 * Redistribution and use in source and binary forms, with or without 42 * modification, are permitted provided that the following conditions 43 * are met: 44 * 1. Redistributions of source code must retain the above copyright 45 * notice, this list of conditions and the following disclaimer. 46 * 2. Redistributions in binary form must reproduce the above copyright 47 * notice, this list of conditions and the following disclaimer in the 48 * documentation and/or other materials provided with the distribution. 49 * 3. Neither the name of the University nor the names of its contributors 50 * may be used to endorse or promote products derived from this software 51 * without specific prior written permission. 52 * 53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 63 * SUCH DAMAGE. 64 * 65 * @(#)com.c 7.5 (Berkeley) 5/16/91 66 */ 67 68 #include <sys/cdefs.h> 69 __KERNEL_RCSID(0, "$NetBSD: ixp12x0_com.c,v 1.37 2010/11/15 06:14:02 uebayasi Exp $"); 70 71 #include "opt_ddb.h" 72 #include "opt_kgdb.h" 73 74 #include "rnd.h" 75 #if NRND > 0 && defined(RND_COM) 76 #include <sys/rnd.h> 77 #endif 78 79 #include <sys/param.h> 80 #include <sys/systm.h> 81 #include <sys/types.h> 82 #include <sys/conf.h> 83 #include <sys/file.h> 84 #include <sys/device.h> 85 #include <sys/kernel.h> 86 #include <sys/malloc.h> 87 #include <sys/tty.h> 88 #include <sys/uio.h> 89 #include <sys/vnode.h> 90 #include <sys/kauth.h> 91 #include <sys/lwp.h> 92 93 #include <machine/intr.h> 94 #include <machine/bus.h> 95 96 #include <arm/ixp12x0/ixp12x0_comreg.h> 97 #include <arm/ixp12x0/ixp12x0_comvar.h> 98 #include <arm/ixp12x0/ixp12x0reg.h> 99 #include <arm/ixp12x0/ixp12x0var.h> 100 101 #include <arm/ixp12x0/ixpsipvar.h> 102 103 #include <dev/cons.h> 104 #include "ixpcom.h" 105 106 static int ixpcomparam(struct tty *, struct termios *); 107 static void ixpcomstart(struct tty *); 108 static int ixpcomhwiflow(struct tty *, int); 109 110 static u_int cflag2cr(tcflag_t); 111 static void ixpcom_iflush(struct ixpcom_softc *); 112 static void ixpcom_set_cr(struct ixpcom_softc *); 113 114 int ixpcomcngetc(dev_t); 115 void ixpcomcnputc(dev_t, int); 116 void ixpcomcnpollc(dev_t, int); 117 118 static void ixpcomsoft(void* arg); 119 inline static void ixpcom_txsoft(struct ixpcom_softc *, struct tty *); 120 inline static void ixpcom_rxsoft(struct ixpcom_softc *, struct tty *); 121 122 void ixpcomcnprobe(struct consdev *); 123 void ixpcomcninit(struct consdev *); 124 125 u_int32_t ixpcom_cr = 0; /* tell cr to *_intr.c */ 126 u_int32_t ixpcom_imask = 0; /* intrrupt mask from *_intr.c */ 127 128 129 static struct ixpcom_cons_softc { 130 bus_space_tag_t sc_iot; 131 bus_space_handle_t sc_ioh; 132 bus_addr_t sc_baseaddr; 133 int sc_ospeed; 134 tcflag_t sc_cflag; 135 int sc_attached; 136 } ixpcomcn_sc; 137 138 static struct cnm_state ixpcom_cnm_state; 139 140 struct ixpcom_softc* ixpcom_sc = NULL; 141 142 extern struct cfdriver ixpcom_cd; 143 144 dev_type_open(ixpcomopen); 145 dev_type_close(ixpcomclose); 146 dev_type_read(ixpcomread); 147 dev_type_write(ixpcomwrite); 148 dev_type_ioctl(ixpcomioctl); 149 dev_type_stop(ixpcomstop); 150 dev_type_tty(ixpcomtty); 151 dev_type_poll(ixpcompoll); 152 153 const struct cdevsw ixpcom_cdevsw = { 154 ixpcomopen, ixpcomclose, ixpcomread, ixpcomwrite, ixpcomioctl, 155 ixpcomstop, ixpcomtty, ixpcompoll, nommap, ttykqfilter, D_TTY 156 }; 157 158 struct consdev ixpcomcons = { 159 NULL, NULL, ixpcomcngetc, ixpcomcnputc, ixpcomcnpollc, NULL, 160 NULL, NULL, NODEV, CN_NORMAL 161 }; 162 163 #ifndef DEFAULT_COMSPEED 164 #define DEFAULT_COMSPEED 38400 165 #endif 166 167 #define COMUNIT_MASK 0x7ffff 168 #define COMDIALOUT_MASK 0x80000 169 170 #define COMUNIT(x) (minor(x) & COMUNIT_MASK) 171 #define COMDIALOUT(x) (minor(x) & COMDIALOUT_MASK) 172 173 #define COM_ISALIVE(sc) ((sc)->enabled != 0 && \ 174 device_is_active(&(sc)->sc_dev)) 175 176 #define COM_BARRIER(t, h, f) bus_space_barrier((t), (h), 0, COM_NPORTS, (f)) 177 178 #define COM_LOCK(sc); 179 #define COM_UNLOCK(sc); 180 181 #define CFLAGS2CR_MASK (CR_PE | CR_OES | CR_SBS | CR_DSS | CR_BRD) 182 183 void 184 ixpcom_attach_subr(struct ixpcom_softc *sc) 185 { 186 struct tty *tp; 187 188 ixpcom_sc = sc; 189 190 /* force to use ixpcom0 for console */ 191 if (sc->sc_iot == ixpcomcn_sc.sc_iot 192 && sc->sc_baseaddr == ixpcomcn_sc.sc_baseaddr) { 193 ixpcomcn_sc.sc_attached = 1; 194 sc->sc_speed = IXPCOMSPEED2BRD(ixpcomcn_sc.sc_ospeed); 195 196 /* Make sure the console is always "hardwired". */ 197 /* XXX IXPCOM_SR should be checked */ 198 delay(10000); /* wait for output to finish */ 199 SET(sc->sc_hwflags, COM_HW_CONSOLE); 200 SET(sc->sc_swflags, TIOCFLAG_SOFTCAR); 201 } 202 203 tp = ttymalloc(); 204 tp->t_oproc = ixpcomstart; 205 tp->t_param = ixpcomparam; 206 tp->t_hwiflow = ixpcomhwiflow; 207 208 sc->sc_tty = tp; 209 sc->sc_rbuf = malloc(IXPCOM_RING_SIZE << 1, M_DEVBUF, M_NOWAIT); 210 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 211 sc->sc_rbavail = IXPCOM_RING_SIZE; 212 if (sc->sc_rbuf == NULL) { 213 printf("%s: unable to allocate ring buffer\n", 214 sc->sc_dev.dv_xname); 215 return; 216 } 217 sc->sc_ebuf = sc->sc_rbuf + (IXPCOM_RING_SIZE << 1); 218 sc->sc_tbc = 0; 219 220 sc->sc_rie = sc->sc_xie = 0; 221 ixpcom_cr = IXPCOMSPEED2BRD(DEFAULT_COMSPEED) 222 | CR_UE | sc->sc_rie | sc->sc_xie | DSS_8BIT; 223 224 tty_attach(tp); 225 226 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 227 int maj; 228 229 /* locate the major number */ 230 maj = cdevsw_lookup_major(&ixpcom_cdevsw); 231 232 cn_tab->cn_dev = makedev(maj, device_unit(&sc->sc_dev)); 233 234 aprint_normal("%s: console\n", sc->sc_dev.dv_xname); 235 } 236 237 sc->sc_si = softint_establish(SOFTINT_SERIAL, ixpcomsoft, sc); 238 239 #if NRND > 0 && defined(RND_COM) 240 rnd_attach_source(&sc->rnd_source, sc->sc_dev.dv_xname, 241 RND_TYPE_TTY, 0); 242 #endif 243 244 /* if there are no enable/disable functions, assume the device 245 is always enabled */ 246 if (!sc->enable) 247 sc->enabled = 1; 248 249 /* XXX configure register */ 250 /* xxx_config(sc) */ 251 252 SET(sc->sc_hwflags, COM_HW_DEV_OK); 253 } 254 255 static int 256 ixpcomparam(struct tty *tp, struct termios *t) 257 { 258 struct ixpcom_softc *sc 259 = device_lookup_private(&ixpcom_cd, COMUNIT(tp->t_dev)); 260 u_int32_t cr; 261 int s; 262 263 if (COM_ISALIVE(sc) == 0) 264 return (EIO); 265 266 cr = IXPCOMSPEED2BRD(t->c_ospeed); 267 268 if (t->c_ispeed && t->c_ispeed != t->c_ospeed) 269 return (EINVAL); 270 271 /* 272 * For the console, always force CLOCAL and !HUPCL, so that the port 273 * is always active. 274 */ 275 if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) || 276 ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 277 SET(t->c_cflag, CLOCAL); 278 CLR(t->c_cflag, HUPCL); 279 } 280 281 /* 282 * If there were no changes, don't do anything. This avoids dropping 283 * input and improves performance when all we did was frob things like 284 * VMIN and VTIME. 285 */ 286 if (tp->t_ospeed == t->c_ospeed && 287 tp->t_cflag == t->c_cflag) 288 return (0); 289 290 cr |= cflag2cr(t->c_cflag); 291 292 s = splserial(); 293 COM_LOCK(sc); 294 295 ixpcom_cr = (ixpcom_cr & ~CFLAGS2CR_MASK) | cr; 296 297 /* 298 * ixpcom don't have any hardware flow control. 299 * we skip it. 300 */ 301 302 /* And copy to tty. */ 303 tp->t_ispeed = 0; 304 tp->t_ospeed = t->c_ospeed; 305 tp->t_cflag = t->c_cflag; 306 307 if (!sc->sc_heldchange) { 308 if (sc->sc_tx_busy) { 309 sc->sc_heldtbc = sc->sc_tbc; 310 sc->sc_tbc = 0; 311 sc->sc_heldchange = 1; 312 } else 313 ixpcom_set_cr(sc); 314 } 315 316 COM_UNLOCK(sc); 317 splx(s); 318 319 /* 320 * Update the tty layer's idea of the carrier bit. 321 * We tell tty the carrier is always on. 322 */ 323 (void) (*tp->t_linesw->l_modem)(tp, 1); 324 325 #ifdef COM_DEBUG 326 if (com_debug) 327 comstatus(sc, "comparam "); 328 #endif 329 330 if (!ISSET(t->c_cflag, CHWFLOW)) { 331 if (sc->sc_tx_stopped) { 332 sc->sc_tx_stopped = 0; 333 ixpcomstart(tp); 334 } 335 } 336 337 return (0); 338 } 339 340 static int 341 ixpcomhwiflow(struct tty *tp, int block) 342 { 343 return (0); 344 } 345 346 static void 347 ixpcom_filltx(struct ixpcom_softc *sc) 348 { 349 bus_space_tag_t iot = sc->sc_iot; 350 bus_space_handle_t ioh = sc->sc_ioh; 351 int n; 352 353 n = 0; 354 while (bus_space_read_4(iot, ioh, IXPCOM_SR) & SR_TXR) { 355 if (n >= sc->sc_tbc) 356 break; 357 bus_space_write_4(iot, ioh, IXPCOM_DR, 358 0xff & *(sc->sc_tba + n)); 359 n++; 360 } 361 sc->sc_tbc -= n; 362 sc->sc_tba += n; 363 } 364 365 static void 366 ixpcomstart(struct tty *tp) 367 { 368 struct ixpcom_softc *sc 369 = device_lookup_private(&ixpcom_cd, COMUNIT(tp->t_dev)); 370 int s; 371 372 if (COM_ISALIVE(sc) == 0) 373 return; 374 375 s = spltty(); 376 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 377 goto out; 378 if (sc->sc_tx_stopped) 379 goto out; 380 381 if (!ttypull(tp)) 382 goto out; 383 384 /* Grab the first contiguous region of buffer space. */ 385 { 386 u_char *tba; 387 int tbc; 388 389 tba = tp->t_outq.c_cf; 390 tbc = ndqb(&tp->t_outq, 0); 391 392 (void)splserial(); 393 COM_LOCK(sc); 394 395 sc->sc_tba = tba; 396 sc->sc_tbc = tbc; 397 } 398 399 SET(tp->t_state, TS_BUSY); 400 sc->sc_tx_busy = 1; 401 402 /* Enable transmit completion interrupts if necessary. */ 403 if (!ISSET(sc->sc_xie, CR_XIE)) { 404 SET(sc->sc_xie, CR_XIE); 405 ixpcom_set_cr(sc); 406 } 407 408 /* Output the first chunk of the contiguous buffer. */ 409 ixpcom_filltx(sc); 410 411 COM_UNLOCK(sc); 412 out: 413 splx(s); 414 return; 415 } 416 417 static void 418 ixpcom_break(struct ixpcom_softc *sc, int onoff) 419 { 420 if (onoff) 421 SET(ixpcom_cr, CR_BRK); 422 else 423 CLR(ixpcom_cr, CR_BRK); 424 if (!sc->sc_heldchange) { 425 if (sc->sc_tx_busy) { 426 sc->sc_heldtbc = sc->sc_tbc; 427 sc->sc_tbc = 0; 428 sc->sc_heldchange = 1; 429 } else 430 ixpcom_set_cr(sc); 431 } 432 } 433 434 static void 435 ixpcom_shutdown(struct ixpcom_softc *sc) 436 { 437 int s; 438 439 s = splserial(); 440 COM_LOCK(sc); 441 442 /* Clear any break condition set with TIOCSBRK. */ 443 ixpcom_break(sc, 0); 444 445 /* Turn off interrupts. */ 446 sc->sc_rie = sc->sc_xie = 0; 447 ixpcom_set_cr(sc); 448 449 if (sc->disable) { 450 #ifdef DIAGNOSTIC 451 if (!sc->enabled) 452 panic("ixpcom_shutdown: not enabled?"); 453 #endif 454 (*sc->disable)(sc); 455 sc->enabled = 0; 456 } 457 COM_UNLOCK(sc); 458 splx(s); 459 } 460 461 int 462 ixpcomopen(dev_t dev, int flag, int mode, struct lwp *l) 463 { 464 struct ixpcom_softc *sc; 465 struct tty *tp; 466 int s, s2; 467 int error; 468 469 sc = device_lookup_private(&ixpcom_cd, COMUNIT(dev)); 470 if (sc == NULL || !ISSET(sc->sc_hwflags, COM_HW_DEV_OK) || 471 sc->sc_rbuf == NULL) 472 return (ENXIO); 473 474 if (!device_is_active(&sc->sc_dev)) 475 return (ENXIO); 476 477 #ifdef KGDB 478 /* 479 * If this is the kgdb port, no other use is permitted. 480 */ 481 if (ISSET(sc->sc_hwflags, COM_HW_KGDB)) 482 return (EBUSY); 483 #endif 484 485 tp = sc->sc_tty; 486 487 if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp)) 488 return (EBUSY); 489 490 s = spltty(); 491 492 /* 493 * Do the following iff this is a first open. 494 */ 495 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 496 struct termios t; 497 498 tp->t_dev = dev; 499 500 s2 = splserial(); 501 COM_LOCK(sc); 502 503 if (sc->enable) { 504 if ((*sc->enable)(sc)) { 505 COM_UNLOCK(sc); 506 splx(s2); 507 splx(s); 508 printf("%s: device enable failed\n", 509 sc->sc_dev.dv_xname); 510 return (EIO); 511 } 512 sc->enabled = 1; 513 #if 0 514 /* XXXXXXXXXXXXXXX */ 515 com_config(sc); 516 #endif 517 } 518 519 /* Turn on interrupts. */ 520 SET(sc->sc_rie, CR_RIE); 521 ixpcom_set_cr(sc); 522 523 #if 0 524 /* Fetch the current modem control status, needed later. */ 525 sc->sc_msr = bus_space_read_1(sc->sc_iot, sc->sc_ioh, com_msr); 526 527 /* Clear PPS capture state on first open. */ 528 sc->sc_ppsmask = 0; 529 sc->ppsparam.mode = 0; 530 #endif 531 532 COM_UNLOCK(sc); 533 splx(s2); 534 535 /* 536 * Initialize the termios status to the defaults. Add in the 537 * sticky bits from TIOCSFLAGS. 538 */ 539 t.c_ispeed = 0; 540 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 541 t.c_ospeed = ixpcomcn_sc.sc_ospeed; 542 t.c_cflag = ixpcomcn_sc.sc_cflag; 543 } else { 544 t.c_ospeed = TTYDEF_SPEED; 545 t.c_cflag = TTYDEF_CFLAG; 546 } 547 if (ISSET(sc->sc_swflags, TIOCFLAG_CLOCAL)) 548 SET(t.c_cflag, CLOCAL); 549 if (ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS)) 550 SET(t.c_cflag, CRTSCTS); 551 if (ISSET(sc->sc_swflags, TIOCFLAG_MDMBUF)) 552 SET(t.c_cflag, MDMBUF); 553 /* Make sure ixpcomparam() will do something. */ 554 tp->t_ospeed = 0; 555 (void) ixpcomparam(tp, &t); 556 tp->t_iflag = TTYDEF_IFLAG; 557 tp->t_oflag = TTYDEF_OFLAG; 558 tp->t_lflag = TTYDEF_LFLAG; 559 ttychars(tp); 560 ttsetwater(tp); 561 562 s2 = splserial(); 563 COM_LOCK(sc); 564 565 /* Clear the input ring, and unblock. */ 566 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 567 sc->sc_rbavail = IXPCOM_RING_SIZE; 568 ixpcom_iflush(sc); 569 CLR(sc->sc_rx_flags, RX_ANY_BLOCK); 570 571 #ifdef COM_DEBUG 572 if (ixpcom_debug) 573 comstatus(sc, "ixpcomopen "); 574 #endif 575 576 COM_UNLOCK(sc); 577 splx(s2); 578 } 579 580 splx(s); 581 582 error = ttyopen(tp, COMDIALOUT(dev), ISSET(flag, O_NONBLOCK)); 583 if (error) 584 goto bad; 585 586 error = (*tp->t_linesw->l_open)(dev, tp); 587 if (error) 588 goto bad; 589 590 return (0); 591 592 bad: 593 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 594 /* 595 * We failed to open the device, and nobody else had it opened. 596 * Clean up the state as appropriate. 597 */ 598 ixpcom_shutdown(sc); 599 } 600 601 return (error); 602 } 603 604 int 605 ixpcomclose(dev_t dev, int flag, int mode, struct lwp *l) 606 { 607 struct ixpcom_softc *sc = device_lookup_private(&ixpcom_cd, COMUNIT(dev)); 608 struct tty *tp = sc->sc_tty; 609 610 /* XXX This is for cons.c. */ 611 if (!ISSET(tp->t_state, TS_ISOPEN)) 612 return (0); 613 614 (*tp->t_linesw->l_close)(tp, flag); 615 ttyclose(tp); 616 617 if (COM_ISALIVE(sc) == 0) 618 return (0); 619 620 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 621 /* 622 * Although we got a last close, the device may still be in 623 * use; e.g. if this was the dialout node, and there are still 624 * processes waiting for carrier on the non-dialout node. 625 */ 626 ixpcom_shutdown(sc); 627 } 628 629 return (0); 630 } 631 632 int 633 ixpcomread(dev_t dev, struct uio *uio, int flag) 634 { 635 struct ixpcom_softc *sc = device_lookup_private(&ixpcom_cd, COMUNIT(dev)); 636 struct tty *tp = sc->sc_tty; 637 638 if (COM_ISALIVE(sc) == 0) 639 return (EIO); 640 641 return ((*tp->t_linesw->l_read)(tp, uio, flag)); 642 } 643 644 int 645 ixpcomwrite(dev_t dev, struct uio *uio, int flag) 646 { 647 struct ixpcom_softc *sc = device_lookup_private(&ixpcom_cd, COMUNIT(dev)); 648 struct tty *tp = sc->sc_tty; 649 650 if (COM_ISALIVE(sc) == 0) 651 return (EIO); 652 653 return ((*tp->t_linesw->l_write)(tp, uio, flag)); 654 } 655 656 int 657 ixpcompoll(dev_t dev, int events, struct lwp *l) 658 { 659 struct ixpcom_softc *sc = device_lookup_private(&ixpcom_cd, COMUNIT(dev)); 660 struct tty *tp = sc->sc_tty; 661 662 if (COM_ISALIVE(sc) == 0) 663 return (EIO); 664 665 return ((*tp->t_linesw->l_poll)(tp, events, l)); 666 } 667 668 struct tty * 669 ixpcomtty(dev_t dev) 670 { 671 struct ixpcom_softc *sc = device_lookup_private(&ixpcom_cd, COMUNIT(dev)); 672 struct tty *tp = sc->sc_tty; 673 674 return (tp); 675 } 676 677 int 678 ixpcomioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 679 { 680 struct ixpcom_softc *sc = device_lookup_private(&ixpcom_cd, COMUNIT(dev)); 681 struct tty *tp = sc->sc_tty; 682 int error; 683 int s; 684 685 if (COM_ISALIVE(sc) == 0) 686 return (EIO); 687 688 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 689 if (error != EPASSTHROUGH) 690 return (error); 691 692 error = ttioctl(tp, cmd, data, flag, l); 693 if (error != EPASSTHROUGH) 694 return (error); 695 696 error = 0; 697 698 s = splserial(); 699 COM_LOCK(sc); 700 701 switch (cmd) { 702 case TIOCSBRK: 703 ixpcom_break(sc, 1); 704 break; 705 706 case TIOCCBRK: 707 ixpcom_break(sc, 0); 708 break; 709 710 case TIOCGFLAGS: 711 *(int *)data = sc->sc_swflags; 712 break; 713 714 case TIOCSFLAGS: 715 error = kauth_authorize_device_tty(l->l_cred, 716 KAUTH_DEVICE_TTY_PRIVSET, tp); 717 if (error) 718 break; 719 sc->sc_swflags = *(int *)data; 720 break; 721 722 default: 723 error = EPASSTHROUGH; 724 break; 725 } 726 727 COM_UNLOCK(sc); 728 splx(s); 729 730 return (error); 731 } 732 733 /* 734 * Stop output on a line. 735 */ 736 void 737 ixpcomstop(struct tty *tp, int flag) 738 { 739 struct ixpcom_softc *sc 740 = device_lookup_private(&ixpcom_cd, COMUNIT(tp->t_dev)); 741 int s; 742 743 s = splserial(); 744 COM_LOCK(sc); 745 if (ISSET(tp->t_state, TS_BUSY)) { 746 /* Stop transmitting at the next chunk. */ 747 sc->sc_tbc = 0; 748 sc->sc_heldtbc = 0; 749 if (!ISSET(tp->t_state, TS_TTSTOP)) 750 SET(tp->t_state, TS_FLUSH); 751 } 752 COM_UNLOCK(sc); 753 splx(s); 754 } 755 756 static u_int 757 cflag2cr(tcflag_t cflag) 758 { 759 u_int cr; 760 761 cr = (cflag & PARENB) ? CR_PE : 0; 762 cr |= (cflag & PARODD) ? CR_OES : 0; 763 cr |= (cflag & CSTOPB) ? CR_SBS : 0; 764 cr |= ((cflag & CSIZE) == CS8) ? DSS_8BIT : 0; 765 766 return (cr); 767 } 768 769 static void 770 ixpcom_iflush(struct ixpcom_softc *sc) 771 { 772 bus_space_tag_t iot = sc->sc_iot; 773 bus_space_handle_t ioh = sc->sc_ioh; 774 #ifdef DIAGNOSTIC 775 int reg; 776 #endif 777 int timo; 778 779 #ifdef DIAGNOSTIC 780 reg = 0xffff; 781 #endif 782 timo = 50000; 783 /* flush any pending I/O */ 784 while (ISSET(bus_space_read_4(iot, ioh, IXPCOM_SR), SR_RXR) 785 && --timo) 786 #ifdef DIAGNOSTIC 787 reg = 788 #else 789 (void) 790 #endif 791 bus_space_read_4(iot, ioh, IXPCOM_DR); 792 #ifdef DIAGNOSTIC 793 if (!timo) 794 printf("%s: com_iflush timeout %02x\n", sc->sc_dev.dv_xname, 795 reg); 796 #endif 797 } 798 799 static void 800 ixpcom_set_cr(struct ixpcom_softc *sc) 801 { 802 /* XXX */ 803 ixpcom_cr &= ~(CR_RIE | CR_XIE); 804 ixpcom_cr |= sc->sc_rie | sc->sc_xie; 805 bus_space_write_4(sc->sc_iot, sc->sc_ioh, IXPCOM_CR, 806 ixpcom_cr & ~ixpcom_imask); 807 } 808 809 int 810 ixpcomcnattach(bus_space_tag_t iot, bus_addr_t iobase, bus_space_handle_t ioh, int ospeed, tcflag_t cflag) 811 { 812 int cr; 813 814 cn_tab = &ixpcomcons; 815 cn_init_magic(&ixpcom_cnm_state); 816 /* 817 * XXX 818 * 819 * ixpcom cannot detect a break. It can only detect framing 820 * errors. And, a sequence of "framing error, framing error" 821 * meens a break. So I made this hack: 822 * 823 * 1. Set default magic is a sequence of "BREAK, BREAK". 824 * 2. Tell cn_check_magic() a "framing error" as BREAK. 825 * 826 * see ixpcom_intr() too. 827 * 828 */ 829 /* default magic is a couple of BREAK. */ 830 cn_set_magic("\047\001\047\001"); 831 832 ixpcomcn_sc.sc_iot = iot; 833 ixpcomcn_sc.sc_ioh = ioh; 834 ixpcomcn_sc.sc_baseaddr = iobase; 835 ixpcomcn_sc.sc_ospeed = ospeed; 836 ixpcomcn_sc.sc_cflag = cflag; 837 838 cr = cflag2cr(cflag); 839 cr |= IXPCOMSPEED2BRD(ospeed); 840 cr |= CR_UE; 841 ixpcom_cr = cr; 842 843 /* enable the UART */ 844 bus_space_write_4(iot, iobase, IXPCOM_CR, cr); 845 846 return (0); 847 } 848 849 void 850 ixpcomcnprobe(struct consdev *cp) 851 { 852 cp->cn_pri = CN_REMOTE; 853 } 854 855 void 856 ixpcomcnpollc(dev_t dev, int on) 857 { 858 } 859 860 void 861 ixpcomcnputc(dev_t dev, int c) 862 { 863 int s; 864 bus_space_tag_t iot = ixpcomcn_sc.sc_iot; 865 bus_space_handle_t ioh = ixpcomcn_sc.sc_ioh; 866 867 s = splserial(); 868 869 while(!(bus_space_read_4(iot, ioh, IXPCOM_SR) & SR_TXR)) 870 ; 871 872 bus_space_write_4(iot, ioh, IXPCOM_DR, c); 873 874 #ifdef DEBUG 875 if (c == '\r') { 876 while(!(bus_space_read_4(iot, ioh, IXPCOM_SR) & SR_TXE)) 877 ; 878 } 879 #endif 880 881 splx(s); 882 } 883 884 int 885 ixpcomcngetc(dev_t dev) 886 { 887 int c; 888 int s; 889 bus_space_tag_t iot = ixpcomcn_sc.sc_iot; 890 bus_space_handle_t ioh = ixpcomcn_sc.sc_ioh; 891 892 s = splserial(); 893 894 while(!(bus_space_read_4(iot, ioh, IXPCOM_SR) & SR_RXR)) 895 ; 896 897 c = bus_space_read_4(iot, ioh, IXPCOM_DR); 898 c &= 0xff; 899 splx(s); 900 901 return (c); 902 } 903 904 inline static void 905 ixpcom_txsoft(struct ixpcom_softc *sc, struct tty *tp) 906 { 907 CLR(tp->t_state, TS_BUSY); 908 if (ISSET(tp->t_state, TS_FLUSH)) 909 CLR(tp->t_state, TS_FLUSH); 910 else 911 ndflush(&tp->t_outq, (int)(sc->sc_tba - tp->t_outq.c_cf)); 912 (*tp->t_linesw->l_start)(tp); 913 } 914 915 inline static void 916 ixpcom_rxsoft(struct ixpcom_softc *sc, struct tty *tp) 917 { 918 int (*rint)(int, struct tty *) = tp->t_linesw->l_rint; 919 u_char *get, *end; 920 u_int cc, scc; 921 u_char lsr; 922 int code; 923 int s; 924 925 end = sc->sc_ebuf; 926 get = sc->sc_rbget; 927 scc = cc = IXPCOM_RING_SIZE - sc->sc_rbavail; 928 #if 0 929 if (cc == IXPCOM_RING_SIZE) { 930 sc->sc_floods++; 931 if (sc->sc_errors++ == 0) 932 callout_reset(&sc->sc_diag_callout, 60 * hz, 933 comdiag, sc); 934 } 935 #endif 936 while (cc) { 937 code = get[0]; 938 lsr = get[1]; 939 if (ISSET(lsr, DR_ROR | DR_FRE | DR_PRE)) { 940 #if 0 941 if (ISSET(lsr, DR_ROR)) { 942 sc->sc_overflows++; 943 if (sc->sc_errors++ == 0) 944 callout_reset(&sc->sc_diag_callout, 945 60 * hz, comdiag, sc); 946 } 947 #endif 948 if (ISSET(lsr, DR_FRE)) 949 SET(code, TTY_FE); 950 if (ISSET(lsr, DR_PRE)) 951 SET(code, TTY_PE); 952 } 953 if ((*rint)(code, tp) == -1) { 954 /* 955 * The line discipline's buffer is out of space. 956 */ 957 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 958 /* 959 * We're either not using flow control, or the 960 * line discipline didn't tell us to block for 961 * some reason. Either way, we have no way to 962 * know when there's more space available, so 963 * just drop the rest of the data. 964 */ 965 get += cc << 1; 966 if (get >= end) 967 get -= IXPCOM_RING_SIZE << 1; 968 cc = 0; 969 } else { 970 /* 971 * Don't schedule any more receive processing 972 * until the line discipline tells us there's 973 * space available (through comhwiflow()). 974 * Leave the rest of the data in the input 975 * buffer. 976 */ 977 SET(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 978 } 979 break; 980 } 981 get += 2; 982 if (get >= end) 983 get = sc->sc_rbuf; 984 cc--; 985 } 986 987 if (cc != scc) { 988 sc->sc_rbget = get; 989 s = splserial(); 990 COM_LOCK(sc); 991 992 cc = sc->sc_rbavail += scc - cc; 993 /* Buffers should be ok again, release possible block. */ 994 if (cc >= 1) { 995 if (ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 996 CLR(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 997 SET(sc->sc_rie, CR_RIE); 998 ixpcom_set_cr(sc); 999 } 1000 if (ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED)) { 1001 CLR(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1002 #if 0 1003 com_hwiflow(sc); 1004 #endif 1005 } 1006 } 1007 COM_UNLOCK(sc); 1008 splx(s); 1009 } 1010 } 1011 1012 static void 1013 ixpcomsoft(void* arg) 1014 { 1015 struct ixpcom_softc *sc = arg; 1016 1017 if (COM_ISALIVE(sc) == 0) 1018 return; 1019 1020 if (sc->sc_rx_ready) { 1021 sc->sc_rx_ready = 0; 1022 ixpcom_rxsoft(sc, sc->sc_tty); 1023 } 1024 if (sc->sc_tx_done) { 1025 sc->sc_tx_done = 0; 1026 ixpcom_txsoft(sc, sc->sc_tty); 1027 } 1028 } 1029 1030 int 1031 ixpcomintr(void* arg) 1032 { 1033 struct ixpcom_softc *sc = arg; 1034 bus_space_tag_t iot = sc->sc_iot; 1035 bus_space_handle_t ioh = sc->sc_ioh; 1036 u_char *put, *end; 1037 u_int cc; 1038 u_int cr; 1039 u_int sr; 1040 u_int32_t c; 1041 1042 if (COM_ISALIVE(sc) == 0) 1043 return (0); 1044 1045 COM_LOCK(sc); 1046 cr = bus_space_read_4(iot, ioh, IXPCOM_CR) & CR_UE; 1047 1048 if (!cr) { 1049 COM_UNLOCK(sc); 1050 return (0); 1051 } 1052 1053 sr = bus_space_read_4(iot, ioh, IXPCOM_SR); 1054 if (!ISSET(sr, SR_TXR | SR_RXR)) 1055 return (0); 1056 1057 /* 1058 * XXX 1059 * 1060 * ixpcom cannot detect a break. It can only detect framing 1061 * errors. And, a sequence of "framing error, framing error" 1062 * meens a break. So I made this hack: 1063 * 1064 * 1. Set default magic is a sequence of "BREAK, BREAK". 1065 * 2. Tell cn_check_magic() a "framing error" as BREAK. 1066 * 1067 * see ixpcomcnattach() too. 1068 * 1069 */ 1070 if (ISSET(sr, SR_FRE)) { 1071 cn_check_magic(sc->sc_tty->t_dev, 1072 CNC_BREAK, ixpcom_cnm_state); 1073 } 1074 1075 end = sc->sc_ebuf; 1076 put = sc->sc_rbput; 1077 cc = sc->sc_rbavail; 1078 1079 if (ISSET(sr, SR_RXR)) { 1080 if (!ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1081 while (cc > 0) { 1082 if (!ISSET(sr, SR_RXR)) 1083 break; 1084 c = bus_space_read_4(iot, ioh, IXPCOM_DR); 1085 if (ISSET(c, DR_FRE)) { 1086 cn_check_magic(sc->sc_tty->t_dev, 1087 CNC_BREAK, 1088 ixpcom_cnm_state); 1089 } 1090 put[0] = c & 0xff; 1091 put[1] = (c >> 8) & 0xff; 1092 cn_check_magic(sc->sc_tty->t_dev, 1093 put[0], ixpcom_cnm_state); 1094 put += 2; 1095 if (put >= end) 1096 put = sc->sc_rbuf; 1097 cc--; 1098 1099 sr = bus_space_read_4(iot, ioh, IXPCOM_SR); 1100 } 1101 1102 /* 1103 * Current string of incoming characters ended because 1104 * no more data was available or we ran out of space. 1105 * Schedule a receive event if any data was received. 1106 * If we're out of space, turn off receive interrupts. 1107 */ 1108 sc->sc_rbput = put; 1109 sc->sc_rbavail = cc; 1110 if (!ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) 1111 sc->sc_rx_ready = 1; 1112 1113 /* 1114 * See if we are in danger of overflowing a buffer. If 1115 * so, use hardware flow control to ease the pressure. 1116 */ 1117 1118 /* but ixpcom cannot. X-( */ 1119 1120 /* 1121 * If we're out of space, disable receive interrupts 1122 * until the queue has drained a bit. 1123 */ 1124 if (!cc) { 1125 SET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1126 CLR(sc->sc_rie, CR_RIE); 1127 ixpcom_set_cr(sc); 1128 } 1129 } else { 1130 #ifdef DIAGNOSTIC 1131 panic("ixpcomintr: we shouldn't reach here"); 1132 #endif 1133 CLR(sc->sc_rie, CR_RIE); 1134 ixpcom_set_cr(sc); 1135 } 1136 } 1137 1138 /* 1139 * Done handling any receive interrupts. See if data can be 1140 * transmitted as well. Schedule tx done event if no data left 1141 * and tty was marked busy. 1142 */ 1143 sr = bus_space_read_4(iot, ioh, IXPCOM_SR); 1144 if (ISSET(sr, SR_TXR)) { 1145 /* 1146 * If we've delayed a parameter change, do it now, and restart 1147 * output. 1148 */ 1149 if (sc->sc_heldchange) { 1150 ixpcom_set_cr(sc); 1151 sc->sc_heldchange = 0; 1152 sc->sc_tbc = sc->sc_heldtbc; 1153 sc->sc_heldtbc = 0; 1154 } 1155 1156 /* Output the next chunk of the contiguous buffer, if any. */ 1157 if (sc->sc_tbc > 0) { 1158 ixpcom_filltx(sc); 1159 } else { 1160 /* Disable transmit completion interrupts if necessary. */ 1161 if (ISSET(sc->sc_xie, CR_XIE)) { 1162 CLR(sc->sc_xie, CR_XIE); 1163 ixpcom_set_cr(sc); 1164 } 1165 if (sc->sc_tx_busy) { 1166 sc->sc_tx_busy = 0; 1167 sc->sc_tx_done = 1; 1168 } 1169 } 1170 } 1171 COM_UNLOCK(sc); 1172 1173 /* Wake up the poller. */ 1174 softint_schedule(sc->sc_si); 1175 1176 #if NRND > 0 && defined(RND_COM) 1177 rnd_add_uint32(&sc->rnd_source, iir | lsr); 1178 #endif 1179 return (1); 1180 } 1181