epcom.c revision 1.14
1 /* $NetBSD: epcom.c,v 1.14 2007/03/04 05:59:37 christos Exp $ */ 2 /* 3 * Copyright (c) 1998, 1999, 2001, 2002, 2004 The NetBSD Foundation, Inc. 4 * All rights reserved. 5 * 6 * This code is derived from software contributed to The NetBSD Foundation 7 * by Jesse Off 8 * 9 * This code is derived from software contributed to The NetBSD Foundation 10 * by Ichiro FUKUHARA and Naoto Shimazaki. 11 * 12 * This code is derived from software contributed to The NetBSD Foundation 13 * by IWAMOTO Toshihiro. 14 * 15 * This code is derived from software contributed to The NetBSD Foundation 16 * by Charles M. Hannum. 17 * 18 * Redistribution and use in source and binary forms, with or without 19 * modification, are permitted provided that the following conditions 20 * are met: 21 * 1. Redistributions of source code must retain the above copyright 22 * notice, this list of conditions and the following disclaimer. 23 * 2. Redistributions in binary form must reproduce the above copyright 24 * notice, this list of conditions and the following disclaimer in the 25 * documentation and/or other materials provided with the distribution. 26 * 3. All advertising materials mentioning features or use of this software 27 * must display the following acknowledgement: 28 * This product includes software developed by the NetBSD 29 * Foundation, Inc. and its contributors. 30 * 4. Neither the name of The NetBSD Foundation nor the names of its 31 * contributors may be used to endorse or promote products derived 32 * from this software without specific prior written permission. 33 * 34 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 35 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 36 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 37 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 38 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 39 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 40 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 41 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 42 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 43 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 44 * POSSIBILITY OF SUCH DAMAGE. 45 */ 46 47 /* 48 * Copyright (c) 1991 The Regents of the University of California. 49 * All rights reserved. 50 * 51 * Redistribution and use in source and binary forms, with or without 52 * modification, are permitted provided that the following conditions 53 * are met: 54 * 1. Redistributions of source code must retain the above copyright 55 * notice, this list of conditions and the following disclaimer. 56 * 2. Redistributions in binary form must reproduce the above copyright 57 * notice, this list of conditions and the following disclaimer in the 58 * documentation and/or other materials provided with the distribution. 59 * 3. Neither the name of the University nor the names of its contributors 60 * may be used to endorse or promote products derived from this software 61 * without specific prior written permission. 62 * 63 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 64 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 65 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 66 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 67 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 68 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 69 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 70 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 71 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 72 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 73 * SUCH DAMAGE. 74 * 75 * @(#)com.c 7.5 (Berkeley) 5/16/91 76 */ 77 78 /* 79 * TODO: hardware flow control 80 */ 81 82 #include <sys/cdefs.h> 83 __KERNEL_RCSID(0, "$NetBSD: epcom.c,v 1.14 2007/03/04 05:59:37 christos Exp $"); 84 85 #include "opt_ddb.h" 86 #include "opt_kgdb.h" 87 #include "epcom.h" 88 89 #include "rnd.h" 90 #if NRND > 0 && defined(RND_COM) 91 #include <sys/rnd.h> 92 #endif 93 94 /* 95 * Override cnmagic(9) macro before including <sys/systm.h>. 96 * We need to know if cn_check_magic triggered debugger, so set a flag. 97 * Callers of cn_check_magic must declare int cn_trapped = 0; 98 * XXX: this is *ugly*! 99 */ 100 #define cn_trap() \ 101 do { \ 102 console_debugger(); \ 103 cn_trapped = 1; \ 104 } while (/* CONSTCOND */ 0) 105 106 107 #include <sys/param.h> 108 #include <sys/systm.h> 109 #include <sys/types.h> 110 #include <sys/conf.h> 111 #include <sys/file.h> 112 #include <sys/device.h> 113 #include <sys/kernel.h> 114 #include <sys/malloc.h> 115 #include <sys/tty.h> 116 #include <sys/uio.h> 117 #include <sys/vnode.h> 118 #include <sys/kauth.h> 119 120 #include <machine/intr.h> 121 #include <machine/bus.h> 122 123 #include <arm/ep93xx/epcomreg.h> 124 #include <arm/ep93xx/epcomvar.h> 125 #include <arm/ep93xx/ep93xxreg.h> 126 #include <arm/ep93xx/ep93xxvar.h> 127 128 #include <dev/cons.h> 129 130 static int epcomparam(struct tty *, struct termios *); 131 static void epcomstart(struct tty *); 132 static int epcomhwiflow(struct tty *, int); 133 134 static u_int cflag2lcrhi(tcflag_t); 135 static void epcom_iflush(struct epcom_softc *); 136 static void epcom_set(struct epcom_softc *); 137 138 int epcomcngetc(dev_t); 139 void epcomcnputc(dev_t, int); 140 void epcomcnpollc(dev_t, int); 141 142 static void epcomsoft(void* arg); 143 inline static void epcom_txsoft(struct epcom_softc *, struct tty *); 144 inline static void epcom_rxsoft(struct epcom_softc *, struct tty *); 145 146 void epcomcnprobe(struct consdev *); 147 void epcomcninit(struct consdev *); 148 149 static struct epcom_cons_softc { 150 bus_space_tag_t sc_iot; 151 bus_space_handle_t sc_ioh; 152 bus_addr_t sc_hwbase; 153 int sc_ospeed; 154 tcflag_t sc_cflag; 155 int sc_attached; 156 } epcomcn_sc; 157 158 static struct cnm_state epcom_cnm_state; 159 160 extern struct cfdriver epcom_cd; 161 162 dev_type_open(epcomopen); 163 dev_type_close(epcomclose); 164 dev_type_read(epcomread); 165 dev_type_write(epcomwrite); 166 dev_type_ioctl(epcomioctl); 167 dev_type_stop(epcomstop); 168 dev_type_tty(epcomtty); 169 dev_type_poll(epcompoll); 170 171 const struct cdevsw epcom_cdevsw = { 172 epcomopen, epcomclose, epcomread, epcomwrite, epcomioctl, 173 epcomstop, epcomtty, epcompoll, nommap, ttykqfilter, D_TTY 174 }; 175 176 struct consdev epcomcons = { 177 NULL, NULL, epcomcngetc, epcomcnputc, epcomcnpollc, NULL, 178 NULL, NULL, NODEV, CN_NORMAL 179 }; 180 181 #ifndef DEFAULT_COMSPEED 182 #define DEFAULT_COMSPEED 115200 183 #endif 184 185 #define COMUNIT_MASK 0x7ffff 186 #define COMDIALOUT_MASK 0x80000 187 188 #define COMUNIT(x) (minor(x) & COMUNIT_MASK) 189 #define COMDIALOUT(x) (minor(x) & COMDIALOUT_MASK) 190 191 #define COM_ISALIVE(sc) ((sc)->enabled != 0 && \ 192 device_is_active(&(sc)->sc_dev)) 193 194 void 195 epcom_attach_subr(struct epcom_softc *sc) 196 { 197 struct tty *tp; 198 199 if (sc->sc_iot == epcomcn_sc.sc_iot 200 && sc->sc_hwbase == epcomcn_sc.sc_hwbase) { 201 epcomcn_sc.sc_attached = 1; 202 sc->sc_lcrlo = EPCOMSPEED2BRD(epcomcn_sc.sc_ospeed) & 0xff; 203 sc->sc_lcrmid = EPCOMSPEED2BRD(epcomcn_sc.sc_ospeed) >> 8; 204 205 /* Make sure the console is always "hardwired". */ 206 delay(10000); /* wait for output to finish */ 207 SET(sc->sc_hwflags, COM_HW_CONSOLE); 208 SET(sc->sc_swflags, TIOCFLAG_SOFTCAR); 209 } 210 211 tp = ttymalloc(); 212 tp->t_oproc = epcomstart; 213 tp->t_param = epcomparam; 214 tp->t_hwiflow = epcomhwiflow; 215 216 sc->sc_tty = tp; 217 sc->sc_rbuf = malloc(EPCOM_RING_SIZE << 1, M_DEVBUF, M_NOWAIT); 218 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 219 sc->sc_rbavail = EPCOM_RING_SIZE; 220 if (sc->sc_rbuf == NULL) { 221 printf("%s: unable to allocate ring buffer\n", 222 sc->sc_dev.dv_xname); 223 return; 224 } 225 sc->sc_ebuf = sc->sc_rbuf + (EPCOM_RING_SIZE << 1); 226 sc->sc_tbc = 0; 227 228 sc->sc_lcrlo = EPCOMSPEED2BRD(DEFAULT_COMSPEED) & 0xff; 229 sc->sc_lcrmid = EPCOMSPEED2BRD(DEFAULT_COMSPEED) >> 8; 230 sc->sc_lcrhi = cflag2lcrhi(CS8); /* 8N1 */ 231 232 tty_attach(tp); 233 234 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 235 int maj; 236 237 /* locate the major number */ 238 maj = cdevsw_lookup_major(&epcom_cdevsw); 239 240 cn_tab->cn_dev = makedev(maj, device_unit(&sc->sc_dev)); 241 242 aprint_normal("%s: console\n", sc->sc_dev.dv_xname); 243 } 244 245 sc->sc_si = softintr_establish(IPL_SOFTSERIAL, epcomsoft, sc); 246 247 #if NRND > 0 && defined(RND_COM) 248 rnd_attach_source(&sc->rnd_source, sc->sc_dev.dv_xname, 249 RND_TYPE_TTY, 0); 250 #endif 251 252 /* if there are no enable/disable functions, assume the device 253 is always enabled */ 254 if (!sc->enable) 255 sc->enabled = 1; 256 257 /* XXX configure register */ 258 /* xxx_config(sc) */ 259 260 SET(sc->sc_hwflags, COM_HW_DEV_OK); 261 } 262 263 static int 264 epcomparam(struct tty *tp, struct termios *t) 265 { 266 struct epcom_softc *sc 267 = device_lookup(&epcom_cd, COMUNIT(tp->t_dev)); 268 int s; 269 270 if (COM_ISALIVE(sc) == 0) 271 return (EIO); 272 273 if (t->c_ispeed && t->c_ispeed != t->c_ospeed) 274 return (EINVAL); 275 276 /* 277 * For the console, always force CLOCAL and !HUPCL, so that the port 278 * is always active. 279 */ 280 if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) || 281 ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 282 SET(t->c_cflag, CLOCAL); 283 CLR(t->c_cflag, HUPCL); 284 } 285 286 /* 287 * If there were no changes, don't do anything. This avoids dropping 288 * input and improves performance when all we did was frob things like 289 * VMIN and VTIME. 290 */ 291 if (tp->t_ospeed == t->c_ospeed && 292 tp->t_cflag == t->c_cflag) 293 return (0); 294 295 s = splserial(); 296 297 sc->sc_lcrhi = cflag2lcrhi(t->c_cflag); 298 sc->sc_lcrlo = EPCOMSPEED2BRD(t->c_ospeed) & 0xff; 299 sc->sc_lcrmid = EPCOMSPEED2BRD(t->c_ospeed) >> 8; 300 301 /* And copy to tty. */ 302 tp->t_ispeed = 0; 303 tp->t_ospeed = t->c_ospeed; 304 tp->t_cflag = t->c_cflag; 305 epcom_set(sc); 306 307 splx(s); 308 309 /* 310 * Update the tty layer's idea of the carrier bit. 311 * We tell tty the carrier is always on. 312 */ 313 (void) (*tp->t_linesw->l_modem)(tp, 1); 314 315 #ifdef COM_DEBUG 316 if (com_debug) 317 comstatus(sc, "comparam "); 318 #endif 319 320 if (!ISSET(t->c_cflag, CHWFLOW)) { 321 if (sc->sc_tx_stopped) { 322 sc->sc_tx_stopped = 0; 323 epcomstart(tp); 324 } 325 } 326 327 return (0); 328 } 329 330 static int 331 epcomhwiflow(struct tty *tp, int block) 332 { 333 return (0); 334 } 335 336 static void 337 epcom_filltx(struct epcom_softc *sc) 338 { 339 bus_space_tag_t iot = sc->sc_iot; 340 bus_space_handle_t ioh = sc->sc_ioh; 341 int n; 342 343 n = 0; 344 while ((bus_space_read_4(iot, ioh, EPCOM_Flag) & Flag_TXFF) == 0) { 345 if (n >= sc->sc_tbc) 346 break; 347 bus_space_write_4(iot, ioh, EPCOM_Data, 348 0xff & *(sc->sc_tba + n)); 349 n++; 350 } 351 sc->sc_tbc -= n; 352 sc->sc_tba += n; 353 } 354 355 static void 356 epcomstart(struct tty *tp) 357 { 358 struct epcom_softc *sc 359 = device_lookup(&epcom_cd, COMUNIT(tp->t_dev)); 360 int s; 361 362 if (COM_ISALIVE(sc) == 0) 363 return; 364 365 s = spltty(); 366 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 367 goto out; 368 if (sc->sc_tx_stopped) 369 goto out; 370 371 if (tp->t_outq.c_cc <= tp->t_lowat) { 372 if (ISSET(tp->t_state, TS_ASLEEP)) { 373 CLR(tp->t_state, TS_ASLEEP); 374 wakeup(&tp->t_outq); 375 } 376 selwakeup(&tp->t_wsel); 377 if (tp->t_outq.c_cc == 0) 378 goto out; 379 } 380 381 /* Grab the first contiguous region of buffer space. */ 382 { 383 u_char *tba; 384 int tbc; 385 386 tba = tp->t_outq.c_cf; 387 tbc = ndqb(&tp->t_outq, 0); 388 389 (void)splserial(); 390 391 sc->sc_tba = tba; 392 sc->sc_tbc = tbc; 393 } 394 395 SET(tp->t_state, TS_BUSY); 396 sc->sc_tx_busy = 1; 397 398 /* Output the first chunk of the contiguous buffer. */ 399 epcom_filltx(sc); 400 401 if (!ISSET(sc->sc_ctrl, Ctrl_TIE)) { 402 SET(sc->sc_ctrl, Ctrl_TIE); 403 epcom_set(sc); 404 } 405 406 out: 407 splx(s); 408 return; 409 } 410 411 static void 412 epcom_break(struct epcom_softc *sc, int onoff) 413 { 414 if (onoff) 415 SET(sc->sc_lcrhi, LinCtrlHigh_BRK); 416 else 417 CLR(sc->sc_lcrhi, LinCtrlHigh_BRK); 418 epcom_set(sc); 419 } 420 421 static void 422 epcom_shutdown(struct epcom_softc *sc) 423 { 424 int s; 425 426 s = splserial(); 427 428 /* Turn off interrupts. */ 429 CLR(sc->sc_ctrl, (Ctrl_TIE|Ctrl_RTIE|Ctrl_RIE)); 430 431 /* Clear any break condition set with TIOCSBRK. */ 432 epcom_break(sc, 0); 433 epcom_set(sc); 434 435 if (sc->disable) { 436 #ifdef DIAGNOSTIC 437 if (!sc->enabled) 438 panic("epcom_shutdown: not enabled?"); 439 #endif 440 (*sc->disable)(sc); 441 sc->enabled = 0; 442 } 443 splx(s); 444 } 445 446 int 447 epcomopen(dev_t dev, int flag, int mode, struct lwp *l) 448 { 449 struct epcom_softc *sc; 450 struct tty *tp; 451 int s, s2; 452 int error; 453 454 sc = device_lookup(&epcom_cd, COMUNIT(dev)); 455 if (sc == NULL || !ISSET(sc->sc_hwflags, COM_HW_DEV_OK) || 456 sc->sc_rbuf == NULL) 457 return (ENXIO); 458 459 if (!device_is_active(&sc->sc_dev)) 460 return (ENXIO); 461 462 #ifdef KGDB 463 /* 464 * If this is the kgdb port, no other use is permitted. 465 */ 466 if (ISSET(sc->sc_hwflags, COM_HW_KGDB)) 467 return (EBUSY); 468 #endif 469 470 tp = sc->sc_tty; 471 472 if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp)) 473 return (EBUSY); 474 475 s = spltty(); 476 477 /* 478 * Do the following iff this is a first open. 479 */ 480 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 481 struct termios t; 482 483 tp->t_dev = dev; 484 485 s2 = splserial(); 486 487 if (sc->enable) { 488 if ((*sc->enable)(sc)) { 489 splx(s2); 490 splx(s); 491 printf("%s: device enable failed\n", 492 sc->sc_dev.dv_xname); 493 return (EIO); 494 } 495 sc->enabled = 1; 496 #if 0 497 /* XXXXXXXXXXXXXXX */ 498 com_config(sc); 499 #endif 500 } 501 502 /* Turn on interrupts. */ 503 SET(sc->sc_ctrl, (Ctrl_UARTE|Ctrl_RIE|Ctrl_RTIE)); 504 epcom_set(sc); 505 506 #if 0 507 /* Fetch the current modem control status, needed later. */ 508 sc->sc_msr = bus_space_read_1(sc->sc_iot, sc->sc_ioh, com_msr); 509 510 /* Clear PPS capture state on first open. */ 511 sc->sc_ppsmask = 0; 512 sc->ppsparam.mode = 0; 513 #endif 514 515 splx(s2); 516 517 /* 518 * Initialize the termios status to the defaults. Add in the 519 * sticky bits from TIOCSFLAGS. 520 */ 521 t.c_ispeed = 0; 522 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 523 t.c_ospeed = epcomcn_sc.sc_ospeed; 524 t.c_cflag = epcomcn_sc.sc_cflag; 525 } else { 526 t.c_ospeed = TTYDEF_SPEED; 527 t.c_cflag = TTYDEF_CFLAG; 528 } 529 if (ISSET(sc->sc_swflags, TIOCFLAG_CLOCAL)) 530 SET(t.c_cflag, CLOCAL); 531 if (ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS)) 532 SET(t.c_cflag, CRTSCTS); 533 if (ISSET(sc->sc_swflags, TIOCFLAG_MDMBUF)) 534 SET(t.c_cflag, MDMBUF); 535 /* Make sure epcomparam() will do something. */ 536 tp->t_ospeed = 0; 537 (void) epcomparam(tp, &t); 538 tp->t_iflag = TTYDEF_IFLAG; 539 tp->t_oflag = TTYDEF_OFLAG; 540 tp->t_lflag = TTYDEF_LFLAG; 541 ttychars(tp); 542 ttsetwater(tp); 543 544 s2 = splserial(); 545 546 /* Clear the input ring, and unblock. */ 547 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 548 sc->sc_rbavail = EPCOM_RING_SIZE; 549 epcom_iflush(sc); 550 CLR(sc->sc_rx_flags, RX_ANY_BLOCK); 551 552 #ifdef COM_DEBUG 553 if (epcom_debug) 554 comstatus(sc, "epcomopen "); 555 #endif 556 557 splx(s2); 558 } 559 560 splx(s); 561 562 error = ttyopen(tp, COMDIALOUT(dev), ISSET(flag, O_NONBLOCK)); 563 if (error) 564 goto bad; 565 566 error = (*tp->t_linesw->l_open)(dev, tp); 567 if (error) 568 goto bad; 569 570 return (0); 571 572 bad: 573 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 574 /* 575 * We failed to open the device, and nobody else had it opened. 576 * Clean up the state as appropriate. 577 */ 578 epcom_shutdown(sc); 579 } 580 581 return (error); 582 } 583 584 int 585 epcomclose(dev_t dev, int flag, int mode, struct lwp *l) 586 { 587 struct epcom_softc *sc = device_lookup(&epcom_cd, COMUNIT(dev)); 588 struct tty *tp = sc->sc_tty; 589 590 /* XXX This is for cons.c. */ 591 if (!ISSET(tp->t_state, TS_ISOPEN)) 592 return (0); 593 594 (*tp->t_linesw->l_close)(tp, flag); 595 ttyclose(tp); 596 597 if (COM_ISALIVE(sc) == 0) 598 return (0); 599 600 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 601 /* 602 * Although we got a last close, the device may still be in 603 * use; e.g. if this was the dialout node, and there are still 604 * processes waiting for carrier on the non-dialout node. 605 */ 606 epcom_shutdown(sc); 607 } 608 609 return (0); 610 } 611 612 int 613 epcomread(dev_t dev, struct uio *uio, int flag) 614 { 615 struct epcom_softc *sc = device_lookup(&epcom_cd, COMUNIT(dev)); 616 struct tty *tp = sc->sc_tty; 617 618 if (COM_ISALIVE(sc) == 0) 619 return (EIO); 620 621 return ((*tp->t_linesw->l_read)(tp, uio, flag)); 622 } 623 624 int 625 epcomwrite(dev_t dev, struct uio *uio, int flag) 626 { 627 struct epcom_softc *sc = device_lookup(&epcom_cd, COMUNIT(dev)); 628 struct tty *tp = sc->sc_tty; 629 630 if (COM_ISALIVE(sc) == 0) 631 return (EIO); 632 633 return ((*tp->t_linesw->l_write)(tp, uio, flag)); 634 } 635 636 int 637 epcompoll(dev_t dev, int events, struct lwp *l) 638 { 639 struct epcom_softc *sc = device_lookup(&epcom_cd, COMUNIT(dev)); 640 struct tty *tp = sc->sc_tty; 641 642 if (COM_ISALIVE(sc) == 0) 643 return (EIO); 644 645 return ((*tp->t_linesw->l_poll)(tp, events, l)); 646 } 647 648 struct tty * 649 epcomtty(dev_t dev) 650 { 651 struct epcom_softc *sc = device_lookup(&epcom_cd, COMUNIT(dev)); 652 struct tty *tp = sc->sc_tty; 653 654 return (tp); 655 } 656 657 int 658 epcomioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 659 { 660 struct epcom_softc *sc = device_lookup(&epcom_cd, COMUNIT(dev)); 661 struct tty *tp = sc->sc_tty; 662 int error; 663 int s; 664 665 if (COM_ISALIVE(sc) == 0) 666 return (EIO); 667 668 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 669 if (error != EPASSTHROUGH) 670 return (error); 671 672 error = ttioctl(tp, cmd, data, flag, l); 673 if (error != EPASSTHROUGH) 674 return (error); 675 676 error = 0; 677 678 s = splserial(); 679 680 switch (cmd) { 681 case TIOCSBRK: 682 epcom_break(sc, 1); 683 break; 684 685 case TIOCCBRK: 686 epcom_break(sc, 0); 687 break; 688 689 case TIOCGFLAGS: 690 *(int *)data = sc->sc_swflags; 691 break; 692 693 case TIOCSFLAGS: 694 error = kauth_authorize_device_tty(l->l_cred, 695 KAUTH_DEVICE_TTY_PRIVSET, tp); 696 if (error) 697 break; 698 sc->sc_swflags = *(int *)data; 699 break; 700 701 default: 702 error = EPASSTHROUGH; 703 break; 704 } 705 706 splx(s); 707 708 return (error); 709 } 710 711 /* 712 * Stop output on a line. 713 */ 714 void 715 epcomstop(struct tty *tp, int flag) 716 { 717 struct epcom_softc *sc 718 = device_lookup(&epcom_cd, COMUNIT(tp->t_dev)); 719 int s; 720 721 s = splserial(); 722 if (ISSET(tp->t_state, TS_BUSY)) { 723 /* Stop transmitting at the next chunk. */ 724 sc->sc_tbc = 0; 725 if (!ISSET(tp->t_state, TS_TTSTOP)) 726 SET(tp->t_state, TS_FLUSH); 727 } 728 splx(s); 729 } 730 731 static u_int 732 cflag2lcrhi(tcflag_t cflag) 733 { 734 u_int lcrhi; 735 736 switch (cflag & CSIZE) { 737 case CS7: 738 lcrhi = 0x40; 739 break; 740 case CS6: 741 lcrhi = 0x20; 742 break; 743 case CS8: 744 default: 745 lcrhi = 0x60; 746 break; 747 } 748 lcrhi |= (cflag & PARENB) ? LinCtrlHigh_PEN : 0; 749 lcrhi |= (cflag & PARODD) ? 0 : LinCtrlHigh_EPS; 750 lcrhi |= (cflag & CSTOPB) ? LinCtrlHigh_STP2 : 0; 751 lcrhi |= LinCtrlHigh_FEN; /* FIFO always enabled */ 752 753 return (lcrhi); 754 } 755 756 static void 757 epcom_iflush(struct epcom_softc *sc) 758 { 759 bus_space_tag_t iot = sc->sc_iot; 760 bus_space_handle_t ioh = sc->sc_ioh; 761 #ifdef DIAGNOSTIC 762 int reg; 763 #endif 764 int timo; 765 766 #ifdef DIAGNOSTIC 767 reg = 0xffff; 768 #endif 769 timo = 50000; 770 /* flush any pending I/O */ 771 while ((bus_space_read_4(iot, ioh, EPCOM_Flag) & Flag_RXFE) == 0 772 && --timo) 773 #ifdef DIAGNOSTIC 774 reg = 775 #else 776 (void) 777 #endif 778 bus_space_read_4(iot, ioh, EPCOM_Data); 779 #ifdef DIAGNOSTIC 780 if (!timo) 781 printf("%s: com_iflush timeout %02x\n", sc->sc_dev.dv_xname, 782 reg); 783 #endif 784 } 785 786 static void 787 epcom_set(struct epcom_softc *sc) 788 { 789 bus_space_write_4(sc->sc_iot, sc->sc_ioh, EPCOM_LinCtrlLow, 790 sc->sc_lcrlo); 791 bus_space_write_4(sc->sc_iot, sc->sc_ioh, EPCOM_LinCtrlMid, 792 sc->sc_lcrmid); 793 bus_space_write_4(sc->sc_iot, sc->sc_ioh, EPCOM_LinCtrlHigh, 794 sc->sc_lcrhi); 795 bus_space_write_4(sc->sc_iot, sc->sc_ioh, EPCOM_Ctrl, 796 sc->sc_ctrl); 797 } 798 799 int 800 epcomcnattach(bus_space_tag_t iot, bus_addr_t iobase, bus_space_handle_t ioh, 801 int ospeed, tcflag_t cflag) 802 { 803 u_int lcrlo, lcrmid, lcrhi, ctrl, pwrcnt; 804 bus_space_handle_t syscon_ioh; 805 806 cn_tab = &epcomcons; 807 cn_init_magic(&epcom_cnm_state); 808 cn_set_magic("\047\001"); 809 810 epcomcn_sc.sc_iot = iot; 811 epcomcn_sc.sc_ioh = ioh; 812 epcomcn_sc.sc_hwbase = iobase; 813 epcomcn_sc.sc_ospeed = ospeed; 814 epcomcn_sc.sc_cflag = cflag; 815 816 lcrhi = cflag2lcrhi(cflag); 817 lcrlo = EPCOMSPEED2BRD(ospeed) & 0xff; 818 lcrmid = EPCOMSPEED2BRD(ospeed) >> 8; 819 ctrl = Ctrl_UARTE; 820 821 bus_space_map(iot, EP93XX_APB_HWBASE + EP93XX_APB_SYSCON, 822 EP93XX_APB_SYSCON_SIZE, 0, &syscon_ioh); 823 pwrcnt = bus_space_read_4(iot, syscon_ioh, EP93XX_SYSCON_PwrCnt); 824 pwrcnt &= ~(PwrCnt_UARTBAUD); 825 bus_space_write_4(iot, syscon_ioh, EP93XX_SYSCON_PwrCnt, pwrcnt); 826 bus_space_unmap(iot, syscon_ioh, EP93XX_APB_SYSCON_SIZE); 827 828 bus_space_write_4(iot, ioh, EPCOM_LinCtrlLow, lcrlo); 829 bus_space_write_4(iot, ioh, EPCOM_LinCtrlMid, lcrmid); 830 bus_space_write_4(iot, ioh, EPCOM_LinCtrlHigh, lcrhi); 831 bus_space_write_4(iot, ioh, EPCOM_Ctrl, ctrl); 832 833 return (0); 834 } 835 836 void 837 epcomcnprobe(struct consdev *cp) 838 { 839 cp->cn_pri = CN_REMOTE; 840 } 841 842 void 843 epcomcnpollc(dev_t dev, int on) 844 { 845 } 846 847 void 848 epcomcnputc(dev_t dev, int c) 849 { 850 int s; 851 bus_space_tag_t iot = epcomcn_sc.sc_iot; 852 bus_space_handle_t ioh = epcomcn_sc.sc_ioh; 853 854 s = splserial(); 855 856 while((bus_space_read_4(iot, ioh, EPCOM_Flag) & Flag_TXFF) != 0) 857 ; 858 859 bus_space_write_4(iot, ioh, EPCOM_Data, c); 860 861 #ifdef DEBUG 862 if (c == '\r') { 863 while((bus_space_read_4(iot, ioh, EPCOM_Flag) & Flag_TXFE) == 0) 864 ; 865 } 866 #endif 867 868 splx(s); 869 } 870 871 int 872 epcomcngetc(dev_t dev) 873 { 874 int c, sts; 875 int s; 876 bus_space_tag_t iot = epcomcn_sc.sc_iot; 877 bus_space_handle_t ioh = epcomcn_sc.sc_ioh; 878 879 s = splserial(); 880 881 while((bus_space_read_4(iot, ioh, EPCOM_Flag) & Flag_RXFE) != 0) 882 ; 883 884 c = bus_space_read_4(iot, ioh, EPCOM_Data); 885 sts = bus_space_read_4(iot, ioh, EPCOM_RXSts); 886 if (ISSET(sts, RXSts_BE)) c = CNC_BREAK; 887 #ifdef DDB 888 extern int db_active; 889 if (!db_active) 890 #endif 891 { 892 int cn_trapped = 0; /* unused */ 893 894 cn_check_magic(dev, c, epcom_cnm_state); 895 } 896 c &= 0xff; 897 splx(s); 898 899 return (c); 900 } 901 902 inline static void 903 epcom_txsoft(struct epcom_softc *sc, struct tty *tp) 904 { 905 CLR(tp->t_state, TS_BUSY); 906 if (ISSET(tp->t_state, TS_FLUSH)) 907 CLR(tp->t_state, TS_FLUSH); 908 else 909 ndflush(&tp->t_outq, (int)(sc->sc_tba - tp->t_outq.c_cf)); 910 (*tp->t_linesw->l_start)(tp); 911 } 912 913 inline static void 914 epcom_rxsoft(struct epcom_softc *sc, struct tty *tp) 915 { 916 int (*rint) __P((int, struct tty *)) = tp->t_linesw->l_rint; 917 u_char *get, *end; 918 u_int cc, scc; 919 u_char sts; 920 int code; 921 int s; 922 923 end = sc->sc_ebuf; 924 get = sc->sc_rbget; 925 scc = cc = EPCOM_RING_SIZE - sc->sc_rbavail; 926 #if 0 927 if (cc == EPCOM_RING_SIZE) { 928 sc->sc_floods++; 929 if (sc->sc_errors++ == 0) 930 callout_reset(&sc->sc_diag_callout, 60 * hz, 931 comdiag, sc); 932 } 933 #endif 934 while (cc) { 935 code = get[0]; 936 sts = get[1]; 937 if (ISSET(sts, RXSts_OE | RXSts_FE | RXSts_PE | RXSts_BE)) { 938 #if 0 939 if (ISSET(lsr, DR_ROR)) { 940 sc->sc_overflows++; 941 if (sc->sc_errors++ == 0) 942 callout_reset(&sc->sc_diag_callout, 943 60 * hz, comdiag, sc); 944 } 945 #endif 946 if (ISSET(sts, (RXSts_FE|RXSts_BE))) 947 SET(code, TTY_FE); 948 if (ISSET(sts, RXSts_PE)) 949 SET(code, TTY_PE); 950 } 951 if ((*rint)(code, tp) == -1) { 952 /* 953 * The line discipline's buffer is out of space. 954 */ 955 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 956 /* 957 * We're either not using flow control, or the 958 * line discipline didn't tell us to block for 959 * some reason. Either way, we have no way to 960 * know when there's more space available, so 961 * just drop the rest of the data. 962 */ 963 get += cc << 1; 964 if (get >= end) 965 get -= EPCOM_RING_SIZE << 1; 966 cc = 0; 967 } else { 968 /* 969 * Don't schedule any more receive processing 970 * until the line discipline tells us there's 971 * space available (through comhwiflow()). 972 * Leave the rest of the data in the input 973 * buffer. 974 */ 975 SET(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 976 } 977 break; 978 } 979 get += 2; 980 if (get >= end) 981 get = sc->sc_rbuf; 982 cc--; 983 } 984 985 if (cc != scc) { 986 sc->sc_rbget = get; 987 s = splserial(); 988 989 cc = sc->sc_rbavail += scc - cc; 990 /* Buffers should be ok again, release possible block. */ 991 if (cc >= 1) { 992 if (ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 993 CLR(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 994 SET(sc->sc_ctrl, (Ctrl_RIE|Ctrl_RTIE)); 995 epcom_set(sc); 996 } 997 if (ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED)) { 998 CLR(sc->sc_rx_flags, RX_IBUF_BLOCKED); 999 #if 0 1000 com_hwiflow(sc); 1001 #endif 1002 } 1003 } 1004 splx(s); 1005 } 1006 } 1007 1008 static void 1009 epcomsoft(void* arg) 1010 { 1011 struct epcom_softc *sc = arg; 1012 1013 if (COM_ISALIVE(sc) == 0) 1014 return; 1015 1016 if (sc->sc_rx_ready) { 1017 sc->sc_rx_ready = 0; 1018 epcom_rxsoft(sc, sc->sc_tty); 1019 } 1020 if (sc->sc_tx_done) { 1021 sc->sc_tx_done = 0; 1022 epcom_txsoft(sc, sc->sc_tty); 1023 } 1024 } 1025 1026 int 1027 epcomintr(void* arg) 1028 { 1029 struct epcom_softc *sc = arg; 1030 bus_space_tag_t iot = sc->sc_iot; 1031 bus_space_handle_t ioh = sc->sc_ioh; 1032 u_char *put, *end; 1033 u_int cc; 1034 u_int flagr; 1035 u_int intr; 1036 u_int32_t c, csts; 1037 1038 intr = bus_space_read_4(iot, ioh, EPCOM_IntIDIntClr); 1039 1040 if (COM_ISALIVE(sc) == 0) 1041 panic("intr on disabled epcom"); 1042 1043 flagr = bus_space_read_4(iot, ioh, EPCOM_Flag); 1044 1045 end = sc->sc_ebuf; 1046 put = sc->sc_rbput; 1047 cc = sc->sc_rbavail; 1048 1049 if (!(ISSET(flagr, Flag_RXFE))) { 1050 if (!ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1051 while (cc > 0) { 1052 if (ISSET(flagr, Flag_RXFE)) 1053 break; 1054 c = bus_space_read_4(iot, ioh, EPCOM_Data); 1055 csts = bus_space_read_4(iot, ioh, EPCOM_RXSts); 1056 if (ISSET(csts, RXSts_BE)) { 1057 int cn_trapped = 0; 1058 1059 cn_check_magic(sc->sc_tty->t_dev, 1060 CNC_BREAK, epcom_cnm_state); 1061 if (cn_trapped) 1062 goto next; 1063 #if defined(KGDB) && !defined(DDB) 1064 if (ISSET(sc->sc_hwflags, COM_HW_KGDB)){ 1065 kgdb_connect(1); 1066 goto next; 1067 } 1068 #endif 1069 } else { 1070 int cn_trapped = 0; 1071 1072 cn_check_magic(sc->sc_tty->t_dev, 1073 (c & 0xff), epcom_cnm_state); 1074 if (cn_trapped) 1075 goto next; 1076 } 1077 1078 1079 put[0] = c & 0xff; 1080 put[1] = csts & 0xf; 1081 put += 2; 1082 if (put >= end) 1083 put = sc->sc_rbuf; 1084 cc--; 1085 next: 1086 flagr = bus_space_read_4(iot, ioh, EPCOM_Flag); 1087 } 1088 1089 /* 1090 * Current string of incoming characters ended because 1091 * no more data was available or we ran out of space. 1092 * Schedule a receive event if any data was received. 1093 * If we're out of space, turn off receive interrupts. 1094 */ 1095 sc->sc_rbput = put; 1096 sc->sc_rbavail = cc; 1097 if (!ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) 1098 sc->sc_rx_ready = 1; 1099 1100 /* 1101 * See if we are in danger of overflowing a buffer. If 1102 * so, use hardware flow control to ease the pressure. 1103 */ 1104 1105 /* but epcom cannot. X-( */ 1106 1107 /* 1108 * If we're out of space, disable receive interrupts 1109 * until the queue has drained a bit. 1110 */ 1111 if (!cc) { 1112 SET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1113 CLR(sc->sc_ctrl, (Ctrl_RIE|Ctrl_RTIE)); 1114 epcom_set(sc); 1115 } 1116 } else { 1117 #ifdef DIAGNOSTIC 1118 panic("epcomintr: we shouldn't reach here"); 1119 #endif 1120 CLR(sc->sc_ctrl, (Ctrl_RIE|Ctrl_RTIE)); 1121 epcom_set(sc); 1122 } 1123 } 1124 1125 /* 1126 * Done handling any receive interrupts. See if data can be 1127 * transmitted as well. Schedule tx done event if no data left 1128 * and tty was marked busy. 1129 */ 1130 1131 if (!ISSET(flagr, Flag_TXFF) && sc->sc_tbc > 0) { 1132 /* Output the next chunk of the contiguous buffer, if any. */ 1133 epcom_filltx(sc); 1134 } else { 1135 /* Disable transmit completion interrupts if necessary. */ 1136 if (ISSET(sc->sc_ctrl, Ctrl_TIE)) { 1137 CLR(sc->sc_ctrl, Ctrl_TIE); 1138 epcom_set(sc); 1139 } 1140 if (sc->sc_tx_busy) { 1141 sc->sc_tx_busy = 0; 1142 sc->sc_tx_done = 1; 1143 } 1144 } 1145 1146 /* Wake up the poller. */ 1147 softintr_schedule(sc->sc_si); 1148 1149 #if 0 /* XXX: broken */ 1150 #if NRND > 0 && defined(RND_COM) 1151 rnd_add_uint32(&sc->rnd_source, intr ^ flagr); 1152 #endif 1153 #endif 1154 return (1); 1155 } 1156
Indexes created Tue Sep 23 21:09:50 GMT 2025