epcom.c revision 1.9
1 /* $NetBSD: epcom.c,v 1.9 2006/03/26 04:38:52 thorpej 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 1.9 2006/03/26 04:38:52 thorpej 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> 118 119 #include <machine/intr.h> 120 #include <machine/bus.h> 121 122 #include <arm/ep93xx/epcomreg.h> 123 #include <arm/ep93xx/epcomvar.h> 124 #include <arm/ep93xx/ep93xxreg.h> 125 #include <arm/ep93xx/ep93xxvar.h> 126 127 #include <dev/cons.h> 128 129 static int epcomparam(struct tty *, struct termios *); 130 static void epcomstart(struct tty *); 131 static int epcomhwiflow(struct tty *, int); 132 133 static u_int cflag2lcrhi(tcflag_t); 134 static void epcom_iflush(struct epcom_softc *); 135 static void epcom_set(struct epcom_softc *); 136 137 int epcomcngetc(dev_t); 138 void epcomcnputc(dev_t, int); 139 void epcomcnpollc(dev_t, int); 140 141 static void epcomsoft(void* arg); 142 inline static void epcom_txsoft(struct epcom_softc *, struct tty *); 143 inline static void epcom_rxsoft(struct epcom_softc *, struct tty *); 144 145 void epcomcnprobe(struct consdev *); 146 void epcomcninit(struct consdev *); 147 148 static struct epcom_cons_softc { 149 bus_space_tag_t sc_iot; 150 bus_space_handle_t sc_ioh; 151 bus_addr_t sc_hwbase; 152 int sc_ospeed; 153 tcflag_t sc_cflag; 154 int sc_attached; 155 } epcomcn_sc; 156 157 static struct cnm_state epcom_cnm_state; 158 159 extern struct cfdriver epcom_cd; 160 161 dev_type_open(epcomopen); 162 dev_type_close(epcomclose); 163 dev_type_read(epcomread); 164 dev_type_write(epcomwrite); 165 dev_type_ioctl(epcomioctl); 166 dev_type_stop(epcomstop); 167 dev_type_tty(epcomtty); 168 dev_type_poll(epcompoll); 169 170 const struct cdevsw epcom_cdevsw = { 171 epcomopen, epcomclose, epcomread, epcomwrite, epcomioctl, 172 epcomstop, epcomtty, epcompoll, nommap, ttykqfilter, D_TTY 173 }; 174 175 struct consdev epcomcons = { 176 NULL, NULL, epcomcngetc, epcomcnputc, epcomcnpollc, NULL, 177 NULL, NULL, NODEV, CN_NORMAL 178 }; 179 180 #ifndef DEFAULT_COMSPEED 181 #define DEFAULT_COMSPEED 115200 182 #endif 183 184 #define COMUNIT_MASK 0x7ffff 185 #define COMDIALOUT_MASK 0x80000 186 187 #define COMUNIT(x) (minor(x) & COMUNIT_MASK) 188 #define COMDIALOUT(x) (minor(x) & COMDIALOUT_MASK) 189 190 #define COM_ISALIVE(sc) ((sc)->enabled != 0 && \ 191 device_is_active(&(sc)->sc_dev)) 192 193 void 194 epcom_attach_subr(struct epcom_softc *sc) 195 { 196 struct tty *tp; 197 198 if (sc->sc_iot == epcomcn_sc.sc_iot 199 && sc->sc_hwbase == epcomcn_sc.sc_hwbase) { 200 epcomcn_sc.sc_attached = 1; 201 sc->sc_lcrlo = EPCOMSPEED2BRD(epcomcn_sc.sc_ospeed) & 0xff; 202 sc->sc_lcrmid = EPCOMSPEED2BRD(epcomcn_sc.sc_ospeed) >> 8; 203 204 /* Make sure the console is always "hardwired". */ 205 delay(10000); /* wait for output to finish */ 206 SET(sc->sc_hwflags, COM_HW_CONSOLE); 207 SET(sc->sc_swflags, TIOCFLAG_SOFTCAR); 208 } 209 210 tp = ttymalloc(); 211 tp->t_oproc = epcomstart; 212 tp->t_param = epcomparam; 213 tp->t_hwiflow = epcomhwiflow; 214 215 sc->sc_tty = tp; 216 sc->sc_rbuf = malloc(EPCOM_RING_SIZE << 1, M_DEVBUF, M_NOWAIT); 217 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 218 sc->sc_rbavail = EPCOM_RING_SIZE; 219 if (sc->sc_rbuf == NULL) { 220 printf("%s: unable to allocate ring buffer\n", 221 sc->sc_dev.dv_xname); 222 return; 223 } 224 sc->sc_ebuf = sc->sc_rbuf + (EPCOM_RING_SIZE << 1); 225 sc->sc_tbc = 0; 226 227 sc->sc_lcrlo = EPCOMSPEED2BRD(DEFAULT_COMSPEED) & 0xff; 228 sc->sc_lcrmid = EPCOMSPEED2BRD(DEFAULT_COMSPEED) >> 8; 229 sc->sc_lcrhi = cflag2lcrhi(CS8); /* 8N1 */ 230 231 tty_attach(tp); 232 233 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 234 int maj; 235 236 /* locate the major number */ 237 maj = cdevsw_lookup_major(&epcom_cdevsw); 238 239 cn_tab->cn_dev = makedev(maj, device_unit(&sc->sc_dev)); 240 241 aprint_normal("%s: console\n", sc->sc_dev.dv_xname); 242 } 243 244 sc->sc_si = softintr_establish(IPL_SOFTSERIAL, epcomsoft, sc); 245 246 #if NRND > 0 && defined(RND_COM) 247 rnd_attach_source(&sc->rnd_source, sc->sc_dev.dv_xname, 248 RND_TYPE_TTY, 0); 249 #endif 250 251 /* if there are no enable/disable functions, assume the device 252 is always enabled */ 253 if (!sc->enable) 254 sc->enabled = 1; 255 256 /* XXX configure register */ 257 /* xxx_config(sc) */ 258 259 SET(sc->sc_hwflags, COM_HW_DEV_OK); 260 } 261 262 static int 263 epcomparam(struct tty *tp, struct termios *t) 264 { 265 struct epcom_softc *sc 266 = device_lookup(&epcom_cd, COMUNIT(tp->t_dev)); 267 int s; 268 269 if (COM_ISALIVE(sc) == 0) 270 return (EIO); 271 272 if (t->c_ispeed && t->c_ispeed != t->c_ospeed) 273 return (EINVAL); 274 275 /* 276 * For the console, always force CLOCAL and !HUPCL, so that the port 277 * is always active. 278 */ 279 if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) || 280 ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 281 SET(t->c_cflag, CLOCAL); 282 CLR(t->c_cflag, HUPCL); 283 } 284 285 /* 286 * If there were no changes, don't do anything. This avoids dropping 287 * input and improves performance when all we did was frob things like 288 * VMIN and VTIME. 289 */ 290 if (tp->t_ospeed == t->c_ospeed && 291 tp->t_cflag == t->c_cflag) 292 return (0); 293 294 s = splserial(); 295 296 sc->sc_lcrhi = cflag2lcrhi(t->c_cflag); 297 sc->sc_lcrlo = EPCOMSPEED2BRD(t->c_ospeed) & 0xff; 298 sc->sc_lcrmid = EPCOMSPEED2BRD(t->c_ospeed) >> 8; 299 300 /* And copy to tty. */ 301 tp->t_ispeed = 0; 302 tp->t_ospeed = t->c_ospeed; 303 tp->t_cflag = t->c_cflag; 304 epcom_set(sc); 305 306 splx(s); 307 308 /* 309 * Update the tty layer's idea of the carrier bit. 310 * We tell tty the carrier is always on. 311 */ 312 (void) (*tp->t_linesw->l_modem)(tp, 1); 313 314 #ifdef COM_DEBUG 315 if (com_debug) 316 comstatus(sc, "comparam "); 317 #endif 318 319 if (!ISSET(t->c_cflag, CHWFLOW)) { 320 if (sc->sc_tx_stopped) { 321 sc->sc_tx_stopped = 0; 322 epcomstart(tp); 323 } 324 } 325 326 return (0); 327 } 328 329 static int 330 epcomhwiflow(struct tty *tp, int block) 331 { 332 return (0); 333 } 334 335 static void 336 epcom_filltx(struct epcom_softc *sc) 337 { 338 bus_space_tag_t iot = sc->sc_iot; 339 bus_space_handle_t ioh = sc->sc_ioh; 340 int n; 341 342 n = 0; 343 while ((bus_space_read_4(iot, ioh, EPCOM_Flag) & Flag_TXFF) == 0) { 344 if (n >= sc->sc_tbc) 345 break; 346 bus_space_write_4(iot, ioh, EPCOM_Data, 347 0xff & *(sc->sc_tba + n)); 348 n++; 349 } 350 sc->sc_tbc -= n; 351 sc->sc_tba += n; 352 } 353 354 static void 355 epcomstart(struct tty *tp) 356 { 357 struct epcom_softc *sc 358 = device_lookup(&epcom_cd, COMUNIT(tp->t_dev)); 359 int s; 360 361 if (COM_ISALIVE(sc) == 0) 362 return; 363 364 s = spltty(); 365 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 366 goto out; 367 if (sc->sc_tx_stopped) 368 goto out; 369 370 if (tp->t_outq.c_cc <= tp->t_lowat) { 371 if (ISSET(tp->t_state, TS_ASLEEP)) { 372 CLR(tp->t_state, TS_ASLEEP); 373 wakeup(&tp->t_outq); 374 } 375 selwakeup(&tp->t_wsel); 376 if (tp->t_outq.c_cc == 0) 377 goto out; 378 } 379 380 /* Grab the first contiguous region of buffer space. */ 381 { 382 u_char *tba; 383 int tbc; 384 385 tba = tp->t_outq.c_cf; 386 tbc = ndqb(&tp->t_outq, 0); 387 388 (void)splserial(); 389 390 sc->sc_tba = tba; 391 sc->sc_tbc = tbc; 392 } 393 394 SET(tp->t_state, TS_BUSY); 395 sc->sc_tx_busy = 1; 396 397 /* Output the first chunk of the contiguous buffer. */ 398 epcom_filltx(sc); 399 400 if (!ISSET(sc->sc_ctrl, Ctrl_TIE)) { 401 SET(sc->sc_ctrl, Ctrl_TIE); 402 epcom_set(sc); 403 } 404 405 out: 406 splx(s); 407 return; 408 } 409 410 static void 411 epcom_break(struct epcom_softc *sc, int onoff) 412 { 413 if (onoff) 414 SET(sc->sc_lcrhi, LinCtrlHigh_BRK); 415 else 416 CLR(sc->sc_lcrhi, LinCtrlHigh_BRK); 417 epcom_set(sc); 418 } 419 420 static void 421 epcom_shutdown(struct epcom_softc *sc) 422 { 423 int s; 424 425 s = splserial(); 426 427 /* Turn off interrupts. */ 428 CLR(sc->sc_ctrl, (Ctrl_TIE|Ctrl_RTIE|Ctrl_RIE)); 429 430 /* Clear any break condition set with TIOCSBRK. */ 431 epcom_break(sc, 0); 432 epcom_set(sc); 433 434 if (sc->disable) { 435 #ifdef DIAGNOSTIC 436 if (!sc->enabled) 437 panic("epcom_shutdown: not enabled?"); 438 #endif 439 (*sc->disable)(sc); 440 sc->enabled = 0; 441 } 442 splx(s); 443 } 444 445 int 446 epcomopen(dev_t dev, int flag, int mode, struct lwp *l) 447 { 448 struct epcom_softc *sc; 449 struct tty *tp; 450 int s, s2; 451 int error; 452 453 sc = device_lookup(&epcom_cd, COMUNIT(dev)); 454 if (sc == NULL || !ISSET(sc->sc_hwflags, COM_HW_DEV_OK) || 455 sc->sc_rbuf == NULL) 456 return (ENXIO); 457 458 if (!device_is_active(&sc->sc_dev)) 459 return (ENXIO); 460 461 #ifdef KGDB 462 /* 463 * If this is the kgdb port, no other use is permitted. 464 */ 465 if (ISSET(sc->sc_hwflags, COM_HW_KGDB)) 466 return (EBUSY); 467 #endif 468 469 tp = sc->sc_tty; 470 471 if (ISSET(tp->t_state, TS_ISOPEN) && 472 ISSET(tp->t_state, TS_XCLUDE) && 473 suser(l->l_proc->p_ucred, &l->l_proc->p_acflag) != 0) 474 return (EBUSY); 475 476 s = spltty(); 477 478 /* 479 * Do the following iff this is a first open. 480 */ 481 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 482 struct termios t; 483 484 tp->t_dev = dev; 485 486 s2 = splserial(); 487 488 if (sc->enable) { 489 if ((*sc->enable)(sc)) { 490 splx(s2); 491 splx(s); 492 printf("%s: device enable failed\n", 493 sc->sc_dev.dv_xname); 494 return (EIO); 495 } 496 sc->enabled = 1; 497 #if 0 498 /* XXXXXXXXXXXXXXX */ 499 com_config(sc); 500 #endif 501 } 502 503 /* Turn on interrupts. */ 504 SET(sc->sc_ctrl, (Ctrl_UARTE|Ctrl_RIE|Ctrl_RTIE)); 505 epcom_set(sc); 506 507 #if 0 508 /* Fetch the current modem control status, needed later. */ 509 sc->sc_msr = bus_space_read_1(sc->sc_iot, sc->sc_ioh, com_msr); 510 511 /* Clear PPS capture state on first open. */ 512 sc->sc_ppsmask = 0; 513 sc->ppsparam.mode = 0; 514 #endif 515 516 splx(s2); 517 518 /* 519 * Initialize the termios status to the defaults. Add in the 520 * sticky bits from TIOCSFLAGS. 521 */ 522 t.c_ispeed = 0; 523 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 524 t.c_ospeed = epcomcn_sc.sc_ospeed; 525 t.c_cflag = epcomcn_sc.sc_cflag; 526 } else { 527 t.c_ospeed = TTYDEF_SPEED; 528 t.c_cflag = TTYDEF_CFLAG; 529 } 530 if (ISSET(sc->sc_swflags, TIOCFLAG_CLOCAL)) 531 SET(t.c_cflag, CLOCAL); 532 if (ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS)) 533 SET(t.c_cflag, CRTSCTS); 534 if (ISSET(sc->sc_swflags, TIOCFLAG_MDMBUF)) 535 SET(t.c_cflag, MDMBUF); 536 /* Make sure epcomparam() will do something. */ 537 tp->t_ospeed = 0; 538 (void) epcomparam(tp, &t); 539 tp->t_iflag = TTYDEF_IFLAG; 540 tp->t_oflag = TTYDEF_OFLAG; 541 tp->t_lflag = TTYDEF_LFLAG; 542 ttychars(tp); 543 ttsetwater(tp); 544 545 s2 = splserial(); 546 547 /* Clear the input ring, and unblock. */ 548 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 549 sc->sc_rbavail = EPCOM_RING_SIZE; 550 epcom_iflush(sc); 551 CLR(sc->sc_rx_flags, RX_ANY_BLOCK); 552 553 #ifdef COM_DEBUG 554 if (epcom_debug) 555 comstatus(sc, "epcomopen "); 556 #endif 557 558 splx(s2); 559 } 560 561 splx(s); 562 563 error = ttyopen(tp, COMDIALOUT(dev), ISSET(flag, O_NONBLOCK)); 564 if (error) 565 goto bad; 566 567 error = (*tp->t_linesw->l_open)(dev, tp); 568 if (error) 569 goto bad; 570 571 return (0); 572 573 bad: 574 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 575 /* 576 * We failed to open the device, and nobody else had it opened. 577 * Clean up the state as appropriate. 578 */ 579 epcom_shutdown(sc); 580 } 581 582 return (error); 583 } 584 585 int 586 epcomclose(dev_t dev, int flag, int mode, struct lwp *l) 587 { 588 struct epcom_softc *sc = device_lookup(&epcom_cd, COMUNIT(dev)); 589 struct tty *tp = sc->sc_tty; 590 591 /* XXX This is for cons.c. */ 592 if (!ISSET(tp->t_state, TS_ISOPEN)) 593 return (0); 594 595 (*tp->t_linesw->l_close)(tp, flag); 596 ttyclose(tp); 597 598 if (COM_ISALIVE(sc) == 0) 599 return (0); 600 601 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 602 /* 603 * Although we got a last close, the device may still be in 604 * use; e.g. if this was the dialout node, and there are still 605 * processes waiting for carrier on the non-dialout node. 606 */ 607 epcom_shutdown(sc); 608 } 609 610 return (0); 611 } 612 613 int 614 epcomread(dev_t dev, struct uio *uio, int flag) 615 { 616 struct epcom_softc *sc = device_lookup(&epcom_cd, COMUNIT(dev)); 617 struct tty *tp = sc->sc_tty; 618 619 if (COM_ISALIVE(sc) == 0) 620 return (EIO); 621 622 return ((*tp->t_linesw->l_read)(tp, uio, flag)); 623 } 624 625 int 626 epcomwrite(dev_t dev, struct uio *uio, int flag) 627 { 628 struct epcom_softc *sc = device_lookup(&epcom_cd, COMUNIT(dev)); 629 struct tty *tp = sc->sc_tty; 630 631 if (COM_ISALIVE(sc) == 0) 632 return (EIO); 633 634 return ((*tp->t_linesw->l_write)(tp, uio, flag)); 635 } 636 637 int 638 epcompoll(dev_t dev, int events, struct lwp *l) 639 { 640 struct epcom_softc *sc = device_lookup(&epcom_cd, COMUNIT(dev)); 641 struct tty *tp = sc->sc_tty; 642 643 if (COM_ISALIVE(sc) == 0) 644 return (EIO); 645 646 return ((*tp->t_linesw->l_poll)(tp, events, l)); 647 } 648 649 struct tty * 650 epcomtty(dev_t dev) 651 { 652 struct epcom_softc *sc = device_lookup(&epcom_cd, COMUNIT(dev)); 653 struct tty *tp = sc->sc_tty; 654 655 return (tp); 656 } 657 658 int 659 epcomioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct lwp *l) 660 { 661 struct epcom_softc *sc = device_lookup(&epcom_cd, COMUNIT(dev)); 662 struct tty *tp = sc->sc_tty; 663 int error; 664 int s; 665 666 if (COM_ISALIVE(sc) == 0) 667 return (EIO); 668 669 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 670 if (error != EPASSTHROUGH) 671 return (error); 672 673 error = ttioctl(tp, cmd, data, flag, l); 674 if (error != EPASSTHROUGH) 675 return (error); 676 677 error = 0; 678 679 s = splserial(); 680 681 switch (cmd) { 682 case TIOCSBRK: 683 epcom_break(sc, 1); 684 break; 685 686 case TIOCCBRK: 687 epcom_break(sc, 0); 688 break; 689 690 case TIOCGFLAGS: 691 *(int *)data = sc->sc_swflags; 692 break; 693 694 case TIOCSFLAGS: 695 error = suser(l->l_proc->p_ucred, &l->l_proc->p_acflag); 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 Fri Sep 26 20:09:58 GMT 2025