epcom.c revision 1.11
1 /* $NetBSD: epcom.c,v 1.11 2006/07/23 22:06:04 ad 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 1.11 2006/07/23 22:06:04 ad 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 (ISSET(tp->t_state, TS_ISOPEN) && 473 ISSET(tp->t_state, TS_XCLUDE) && 474 kauth_authorize_generic(l->l_cred, KAUTH_GENERIC_ISSUSER, 475 &l->l_acflag) != 0) 476 return (EBUSY); 477 478 s = spltty(); 479 480 /* 481 * Do the following iff this is a first open. 482 */ 483 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 484 struct termios t; 485 486 tp->t_dev = dev; 487 488 s2 = splserial(); 489 490 if (sc->enable) { 491 if ((*sc->enable)(sc)) { 492 splx(s2); 493 splx(s); 494 printf("%s: device enable failed\n", 495 sc->sc_dev.dv_xname); 496 return (EIO); 497 } 498 sc->enabled = 1; 499 #if 0 500 /* XXXXXXXXXXXXXXX */ 501 com_config(sc); 502 #endif 503 } 504 505 /* Turn on interrupts. */ 506 SET(sc->sc_ctrl, (Ctrl_UARTE|Ctrl_RIE|Ctrl_RTIE)); 507 epcom_set(sc); 508 509 #if 0 510 /* Fetch the current modem control status, needed later. */ 511 sc->sc_msr = bus_space_read_1(sc->sc_iot, sc->sc_ioh, com_msr); 512 513 /* Clear PPS capture state on first open. */ 514 sc->sc_ppsmask = 0; 515 sc->ppsparam.mode = 0; 516 #endif 517 518 splx(s2); 519 520 /* 521 * Initialize the termios status to the defaults. Add in the 522 * sticky bits from TIOCSFLAGS. 523 */ 524 t.c_ispeed = 0; 525 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 526 t.c_ospeed = epcomcn_sc.sc_ospeed; 527 t.c_cflag = epcomcn_sc.sc_cflag; 528 } else { 529 t.c_ospeed = TTYDEF_SPEED; 530 t.c_cflag = TTYDEF_CFLAG; 531 } 532 if (ISSET(sc->sc_swflags, TIOCFLAG_CLOCAL)) 533 SET(t.c_cflag, CLOCAL); 534 if (ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS)) 535 SET(t.c_cflag, CRTSCTS); 536 if (ISSET(sc->sc_swflags, TIOCFLAG_MDMBUF)) 537 SET(t.c_cflag, MDMBUF); 538 /* Make sure epcomparam() will do something. */ 539 tp->t_ospeed = 0; 540 (void) epcomparam(tp, &t); 541 tp->t_iflag = TTYDEF_IFLAG; 542 tp->t_oflag = TTYDEF_OFLAG; 543 tp->t_lflag = TTYDEF_LFLAG; 544 ttychars(tp); 545 ttsetwater(tp); 546 547 s2 = splserial(); 548 549 /* Clear the input ring, and unblock. */ 550 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 551 sc->sc_rbavail = EPCOM_RING_SIZE; 552 epcom_iflush(sc); 553 CLR(sc->sc_rx_flags, RX_ANY_BLOCK); 554 555 #ifdef COM_DEBUG 556 if (epcom_debug) 557 comstatus(sc, "epcomopen "); 558 #endif 559 560 splx(s2); 561 } 562 563 splx(s); 564 565 error = ttyopen(tp, COMDIALOUT(dev), ISSET(flag, O_NONBLOCK)); 566 if (error) 567 goto bad; 568 569 error = (*tp->t_linesw->l_open)(dev, tp); 570 if (error) 571 goto bad; 572 573 return (0); 574 575 bad: 576 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 577 /* 578 * We failed to open the device, and nobody else had it opened. 579 * Clean up the state as appropriate. 580 */ 581 epcom_shutdown(sc); 582 } 583 584 return (error); 585 } 586 587 int 588 epcomclose(dev_t dev, int flag, int mode, struct lwp *l) 589 { 590 struct epcom_softc *sc = device_lookup(&epcom_cd, COMUNIT(dev)); 591 struct tty *tp = sc->sc_tty; 592 593 /* XXX This is for cons.c. */ 594 if (!ISSET(tp->t_state, TS_ISOPEN)) 595 return (0); 596 597 (*tp->t_linesw->l_close)(tp, flag); 598 ttyclose(tp); 599 600 if (COM_ISALIVE(sc) == 0) 601 return (0); 602 603 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 604 /* 605 * Although we got a last close, the device may still be in 606 * use; e.g. if this was the dialout node, and there are still 607 * processes waiting for carrier on the non-dialout node. 608 */ 609 epcom_shutdown(sc); 610 } 611 612 return (0); 613 } 614 615 int 616 epcomread(dev_t dev, struct uio *uio, int flag) 617 { 618 struct epcom_softc *sc = device_lookup(&epcom_cd, COMUNIT(dev)); 619 struct tty *tp = sc->sc_tty; 620 621 if (COM_ISALIVE(sc) == 0) 622 return (EIO); 623 624 return ((*tp->t_linesw->l_read)(tp, uio, flag)); 625 } 626 627 int 628 epcomwrite(dev_t dev, struct uio *uio, int flag) 629 { 630 struct epcom_softc *sc = device_lookup(&epcom_cd, COMUNIT(dev)); 631 struct tty *tp = sc->sc_tty; 632 633 if (COM_ISALIVE(sc) == 0) 634 return (EIO); 635 636 return ((*tp->t_linesw->l_write)(tp, uio, flag)); 637 } 638 639 int 640 epcompoll(dev_t dev, int events, struct lwp *l) 641 { 642 struct epcom_softc *sc = device_lookup(&epcom_cd, COMUNIT(dev)); 643 struct tty *tp = sc->sc_tty; 644 645 if (COM_ISALIVE(sc) == 0) 646 return (EIO); 647 648 return ((*tp->t_linesw->l_poll)(tp, events, l)); 649 } 650 651 struct tty * 652 epcomtty(dev_t dev) 653 { 654 struct epcom_softc *sc = device_lookup(&epcom_cd, COMUNIT(dev)); 655 struct tty *tp = sc->sc_tty; 656 657 return (tp); 658 } 659 660 int 661 epcomioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct lwp *l) 662 { 663 struct epcom_softc *sc = device_lookup(&epcom_cd, COMUNIT(dev)); 664 struct tty *tp = sc->sc_tty; 665 int error; 666 int s; 667 668 if (COM_ISALIVE(sc) == 0) 669 return (EIO); 670 671 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 672 if (error != EPASSTHROUGH) 673 return (error); 674 675 error = ttioctl(tp, cmd, data, flag, l); 676 if (error != EPASSTHROUGH) 677 return (error); 678 679 error = 0; 680 681 s = splserial(); 682 683 switch (cmd) { 684 case TIOCSBRK: 685 epcom_break(sc, 1); 686 break; 687 688 case TIOCCBRK: 689 epcom_break(sc, 0); 690 break; 691 692 case TIOCGFLAGS: 693 *(int *)data = sc->sc_swflags; 694 break; 695 696 case TIOCSFLAGS: 697 error = kauth_authorize_generic(l->l_cred, 698 KAUTH_GENERIC_ISSUSER, &l->l_acflag); 699 if (error) 700 break; 701 sc->sc_swflags = *(int *)data; 702 break; 703 704 default: 705 error = EPASSTHROUGH; 706 break; 707 } 708 709 splx(s); 710 711 return (error); 712 } 713 714 /* 715 * Stop output on a line. 716 */ 717 void 718 epcomstop(struct tty *tp, int flag) 719 { 720 struct epcom_softc *sc 721 = device_lookup(&epcom_cd, COMUNIT(tp->t_dev)); 722 int s; 723 724 s = splserial(); 725 if (ISSET(tp->t_state, TS_BUSY)) { 726 /* Stop transmitting at the next chunk. */ 727 sc->sc_tbc = 0; 728 if (!ISSET(tp->t_state, TS_TTSTOP)) 729 SET(tp->t_state, TS_FLUSH); 730 } 731 splx(s); 732 } 733 734 static u_int 735 cflag2lcrhi(tcflag_t cflag) 736 { 737 u_int lcrhi; 738 739 switch (cflag & CSIZE) { 740 case CS7: 741 lcrhi = 0x40; 742 break; 743 case CS6: 744 lcrhi = 0x20; 745 break; 746 case CS8: 747 default: 748 lcrhi = 0x60; 749 break; 750 } 751 lcrhi |= (cflag & PARENB) ? LinCtrlHigh_PEN : 0; 752 lcrhi |= (cflag & PARODD) ? 0 : LinCtrlHigh_EPS; 753 lcrhi |= (cflag & CSTOPB) ? LinCtrlHigh_STP2 : 0; 754 lcrhi |= LinCtrlHigh_FEN; /* FIFO always enabled */ 755 756 return (lcrhi); 757 } 758 759 static void 760 epcom_iflush(struct epcom_softc *sc) 761 { 762 bus_space_tag_t iot = sc->sc_iot; 763 bus_space_handle_t ioh = sc->sc_ioh; 764 #ifdef DIAGNOSTIC 765 int reg; 766 #endif 767 int timo; 768 769 #ifdef DIAGNOSTIC 770 reg = 0xffff; 771 #endif 772 timo = 50000; 773 /* flush any pending I/O */ 774 while ((bus_space_read_4(iot, ioh, EPCOM_Flag) & Flag_RXFE) == 0 775 && --timo) 776 #ifdef DIAGNOSTIC 777 reg = 778 #else 779 (void) 780 #endif 781 bus_space_read_4(iot, ioh, EPCOM_Data); 782 #ifdef DIAGNOSTIC 783 if (!timo) 784 printf("%s: com_iflush timeout %02x\n", sc->sc_dev.dv_xname, 785 reg); 786 #endif 787 } 788 789 static void 790 epcom_set(struct epcom_softc *sc) 791 { 792 bus_space_write_4(sc->sc_iot, sc->sc_ioh, EPCOM_LinCtrlLow, 793 sc->sc_lcrlo); 794 bus_space_write_4(sc->sc_iot, sc->sc_ioh, EPCOM_LinCtrlMid, 795 sc->sc_lcrmid); 796 bus_space_write_4(sc->sc_iot, sc->sc_ioh, EPCOM_LinCtrlHigh, 797 sc->sc_lcrhi); 798 bus_space_write_4(sc->sc_iot, sc->sc_ioh, EPCOM_Ctrl, 799 sc->sc_ctrl); 800 } 801 802 int 803 epcomcnattach(bus_space_tag_t iot, bus_addr_t iobase, bus_space_handle_t ioh, 804 int ospeed, tcflag_t cflag) 805 { 806 u_int lcrlo, lcrmid, lcrhi, ctrl, pwrcnt; 807 bus_space_handle_t syscon_ioh; 808 809 cn_tab = &epcomcons; 810 cn_init_magic(&epcom_cnm_state); 811 cn_set_magic("\047\001"); 812 813 epcomcn_sc.sc_iot = iot; 814 epcomcn_sc.sc_ioh = ioh; 815 epcomcn_sc.sc_hwbase = iobase; 816 epcomcn_sc.sc_ospeed = ospeed; 817 epcomcn_sc.sc_cflag = cflag; 818 819 lcrhi = cflag2lcrhi(cflag); 820 lcrlo = EPCOMSPEED2BRD(ospeed) & 0xff; 821 lcrmid = EPCOMSPEED2BRD(ospeed) >> 8; 822 ctrl = Ctrl_UARTE; 823 824 bus_space_map(iot, EP93XX_APB_HWBASE + EP93XX_APB_SYSCON, 825 EP93XX_APB_SYSCON_SIZE, 0, &syscon_ioh); 826 pwrcnt = bus_space_read_4(iot, syscon_ioh, EP93XX_SYSCON_PwrCnt); 827 pwrcnt &= ~(PwrCnt_UARTBAUD); 828 bus_space_write_4(iot, syscon_ioh, EP93XX_SYSCON_PwrCnt, pwrcnt); 829 bus_space_unmap(iot, syscon_ioh, EP93XX_APB_SYSCON_SIZE); 830 831 bus_space_write_4(iot, ioh, EPCOM_LinCtrlLow, lcrlo); 832 bus_space_write_4(iot, ioh, EPCOM_LinCtrlMid, lcrmid); 833 bus_space_write_4(iot, ioh, EPCOM_LinCtrlHigh, lcrhi); 834 bus_space_write_4(iot, ioh, EPCOM_Ctrl, ctrl); 835 836 return (0); 837 } 838 839 void 840 epcomcnprobe(struct consdev *cp) 841 { 842 cp->cn_pri = CN_REMOTE; 843 } 844 845 void 846 epcomcnpollc(dev_t dev, int on) 847 { 848 } 849 850 void 851 epcomcnputc(dev_t dev, int c) 852 { 853 int s; 854 bus_space_tag_t iot = epcomcn_sc.sc_iot; 855 bus_space_handle_t ioh = epcomcn_sc.sc_ioh; 856 857 s = splserial(); 858 859 while((bus_space_read_4(iot, ioh, EPCOM_Flag) & Flag_TXFF) != 0) 860 ; 861 862 bus_space_write_4(iot, ioh, EPCOM_Data, c); 863 864 #ifdef DEBUG 865 if (c == '\r') { 866 while((bus_space_read_4(iot, ioh, EPCOM_Flag) & Flag_TXFE) == 0) 867 ; 868 } 869 #endif 870 871 splx(s); 872 } 873 874 int 875 epcomcngetc(dev_t dev) 876 { 877 int c, sts; 878 int s; 879 bus_space_tag_t iot = epcomcn_sc.sc_iot; 880 bus_space_handle_t ioh = epcomcn_sc.sc_ioh; 881 882 s = splserial(); 883 884 while((bus_space_read_4(iot, ioh, EPCOM_Flag) & Flag_RXFE) != 0) 885 ; 886 887 c = bus_space_read_4(iot, ioh, EPCOM_Data); 888 sts = bus_space_read_4(iot, ioh, EPCOM_RXSts); 889 if (ISSET(sts, RXSts_BE)) c = CNC_BREAK; 890 #ifdef DDB 891 extern int db_active; 892 if (!db_active) 893 #endif 894 { 895 int cn_trapped = 0; /* unused */ 896 897 cn_check_magic(dev, c, epcom_cnm_state); 898 } 899 c &= 0xff; 900 splx(s); 901 902 return (c); 903 } 904 905 inline static void 906 epcom_txsoft(struct epcom_softc *sc, struct tty *tp) 907 { 908 CLR(tp->t_state, TS_BUSY); 909 if (ISSET(tp->t_state, TS_FLUSH)) 910 CLR(tp->t_state, TS_FLUSH); 911 else 912 ndflush(&tp->t_outq, (int)(sc->sc_tba - tp->t_outq.c_cf)); 913 (*tp->t_linesw->l_start)(tp); 914 } 915 916 inline static void 917 epcom_rxsoft(struct epcom_softc *sc, struct tty *tp) 918 { 919 int (*rint) __P((int, struct tty *)) = tp->t_linesw->l_rint; 920 u_char *get, *end; 921 u_int cc, scc; 922 u_char sts; 923 int code; 924 int s; 925 926 end = sc->sc_ebuf; 927 get = sc->sc_rbget; 928 scc = cc = EPCOM_RING_SIZE - sc->sc_rbavail; 929 #if 0 930 if (cc == EPCOM_RING_SIZE) { 931 sc->sc_floods++; 932 if (sc->sc_errors++ == 0) 933 callout_reset(&sc->sc_diag_callout, 60 * hz, 934 comdiag, sc); 935 } 936 #endif 937 while (cc) { 938 code = get[0]; 939 sts = get[1]; 940 if (ISSET(sts, RXSts_OE | RXSts_FE | RXSts_PE | RXSts_BE)) { 941 #if 0 942 if (ISSET(lsr, DR_ROR)) { 943 sc->sc_overflows++; 944 if (sc->sc_errors++ == 0) 945 callout_reset(&sc->sc_diag_callout, 946 60 * hz, comdiag, sc); 947 } 948 #endif 949 if (ISSET(sts, (RXSts_FE|RXSts_BE))) 950 SET(code, TTY_FE); 951 if (ISSET(sts, RXSts_PE)) 952 SET(code, TTY_PE); 953 } 954 if ((*rint)(code, tp) == -1) { 955 /* 956 * The line discipline's buffer is out of space. 957 */ 958 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 959 /* 960 * We're either not using flow control, or the 961 * line discipline didn't tell us to block for 962 * some reason. Either way, we have no way to 963 * know when there's more space available, so 964 * just drop the rest of the data. 965 */ 966 get += cc << 1; 967 if (get >= end) 968 get -= EPCOM_RING_SIZE << 1; 969 cc = 0; 970 } else { 971 /* 972 * Don't schedule any more receive processing 973 * until the line discipline tells us there's 974 * space available (through comhwiflow()). 975 * Leave the rest of the data in the input 976 * buffer. 977 */ 978 SET(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 979 } 980 break; 981 } 982 get += 2; 983 if (get >= end) 984 get = sc->sc_rbuf; 985 cc--; 986 } 987 988 if (cc != scc) { 989 sc->sc_rbget = get; 990 s = splserial(); 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_ctrl, (Ctrl_RIE|Ctrl_RTIE)); 998 epcom_set(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 splx(s); 1008 } 1009 } 1010 1011 static void 1012 epcomsoft(void* arg) 1013 { 1014 struct epcom_softc *sc = arg; 1015 1016 if (COM_ISALIVE(sc) == 0) 1017 return; 1018 1019 if (sc->sc_rx_ready) { 1020 sc->sc_rx_ready = 0; 1021 epcom_rxsoft(sc, sc->sc_tty); 1022 } 1023 if (sc->sc_tx_done) { 1024 sc->sc_tx_done = 0; 1025 epcom_txsoft(sc, sc->sc_tty); 1026 } 1027 } 1028 1029 int 1030 epcomintr(void* arg) 1031 { 1032 struct epcom_softc *sc = arg; 1033 bus_space_tag_t iot = sc->sc_iot; 1034 bus_space_handle_t ioh = sc->sc_ioh; 1035 u_char *put, *end; 1036 u_int cc; 1037 u_int flagr; 1038 u_int intr; 1039 u_int32_t c, csts; 1040 1041 intr = bus_space_read_4(iot, ioh, EPCOM_IntIDIntClr); 1042 1043 if (COM_ISALIVE(sc) == 0) 1044 panic("intr on disabled epcom"); 1045 1046 flagr = bus_space_read_4(iot, ioh, EPCOM_Flag); 1047 1048 end = sc->sc_ebuf; 1049 put = sc->sc_rbput; 1050 cc = sc->sc_rbavail; 1051 1052 if (!(ISSET(flagr, Flag_RXFE))) { 1053 if (!ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1054 while (cc > 0) { 1055 if (ISSET(flagr, Flag_RXFE)) 1056 break; 1057 c = bus_space_read_4(iot, ioh, EPCOM_Data); 1058 csts = bus_space_read_4(iot, ioh, EPCOM_RXSts); 1059 if (ISSET(csts, RXSts_BE)) { 1060 int cn_trapped = 0; 1061 1062 cn_check_magic(sc->sc_tty->t_dev, 1063 CNC_BREAK, epcom_cnm_state); 1064 if (cn_trapped) 1065 goto next; 1066 #if defined(KGDB) && !defined(DDB) 1067 if (ISSET(sc->sc_hwflags, COM_HW_KGDB)){ 1068 kgdb_connect(1); 1069 goto next; 1070 } 1071 #endif 1072 } else { 1073 int cn_trapped = 0; 1074 1075 cn_check_magic(sc->sc_tty->t_dev, 1076 (c & 0xff), epcom_cnm_state); 1077 if (cn_trapped) 1078 goto next; 1079 } 1080 1081 1082 put[0] = c & 0xff; 1083 put[1] = csts & 0xf; 1084 put += 2; 1085 if (put >= end) 1086 put = sc->sc_rbuf; 1087 cc--; 1088 next: 1089 flagr = bus_space_read_4(iot, ioh, EPCOM_Flag); 1090 } 1091 1092 /* 1093 * Current string of incoming characters ended because 1094 * no more data was available or we ran out of space. 1095 * Schedule a receive event if any data was received. 1096 * If we're out of space, turn off receive interrupts. 1097 */ 1098 sc->sc_rbput = put; 1099 sc->sc_rbavail = cc; 1100 if (!ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) 1101 sc->sc_rx_ready = 1; 1102 1103 /* 1104 * See if we are in danger of overflowing a buffer. If 1105 * so, use hardware flow control to ease the pressure. 1106 */ 1107 1108 /* but epcom cannot. X-( */ 1109 1110 /* 1111 * If we're out of space, disable receive interrupts 1112 * until the queue has drained a bit. 1113 */ 1114 if (!cc) { 1115 SET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1116 CLR(sc->sc_ctrl, (Ctrl_RIE|Ctrl_RTIE)); 1117 epcom_set(sc); 1118 } 1119 } else { 1120 #ifdef DIAGNOSTIC 1121 panic("epcomintr: we shouldn't reach here"); 1122 #endif 1123 CLR(sc->sc_ctrl, (Ctrl_RIE|Ctrl_RTIE)); 1124 epcom_set(sc); 1125 } 1126 } 1127 1128 /* 1129 * Done handling any receive interrupts. See if data can be 1130 * transmitted as well. Schedule tx done event if no data left 1131 * and tty was marked busy. 1132 */ 1133 1134 if (!ISSET(flagr, Flag_TXFF) && sc->sc_tbc > 0) { 1135 /* Output the next chunk of the contiguous buffer, if any. */ 1136 epcom_filltx(sc); 1137 } else { 1138 /* Disable transmit completion interrupts if necessary. */ 1139 if (ISSET(sc->sc_ctrl, Ctrl_TIE)) { 1140 CLR(sc->sc_ctrl, Ctrl_TIE); 1141 epcom_set(sc); 1142 } 1143 if (sc->sc_tx_busy) { 1144 sc->sc_tx_busy = 0; 1145 sc->sc_tx_done = 1; 1146 } 1147 } 1148 1149 /* Wake up the poller. */ 1150 softintr_schedule(sc->sc_si); 1151 1152 #if 0 /* XXX: broken */ 1153 #if NRND > 0 && defined(RND_COM) 1154 rnd_add_uint32(&sc->rnd_source, intr ^ flagr); 1155 #endif 1156 #endif 1157 return (1); 1158 } 1159
Indexes created Fri Sep 26 08:10:20 GMT 2025