epcom.c revision 1.6
1 /* $NetBSD: epcom.c,v 1.6 2005/12/14 00:32:29 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 1.6 2005/12/14 00:32:29 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> 118 119 #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 ISSET((sc)->sc_dev.dv_flags, DVF_ACTIVE)) 192 193 #define SET(t, f) (t) |= (f) 194 #define CLR(t, f) (t) &= ~(f) 195 #define ISSET(t, f) ((t) & (f)) 196 197 void 198 epcom_attach_subr(struct epcom_softc *sc) 199 { 200 struct tty *tp; 201 202 if (sc->sc_iot == epcomcn_sc.sc_iot 203 && sc->sc_hwbase == epcomcn_sc.sc_hwbase) { 204 epcomcn_sc.sc_attached = 1; 205 sc->sc_lcrlo = EPCOMSPEED2BRD(epcomcn_sc.sc_ospeed) & 0xff; 206 sc->sc_lcrmid = EPCOMSPEED2BRD(epcomcn_sc.sc_ospeed) >> 8; 207 208 /* Make sure the console is always "hardwired". */ 209 delay(10000); /* wait for output to finish */ 210 SET(sc->sc_hwflags, COM_HW_CONSOLE); 211 SET(sc->sc_swflags, TIOCFLAG_SOFTCAR); 212 } 213 214 tp = ttymalloc(); 215 tp->t_oproc = epcomstart; 216 tp->t_param = epcomparam; 217 tp->t_hwiflow = epcomhwiflow; 218 219 sc->sc_tty = tp; 220 sc->sc_rbuf = malloc(EPCOM_RING_SIZE << 1, M_DEVBUF, M_NOWAIT); 221 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 222 sc->sc_rbavail = EPCOM_RING_SIZE; 223 if (sc->sc_rbuf == NULL) { 224 printf("%s: unable to allocate ring buffer\n", 225 sc->sc_dev.dv_xname); 226 return; 227 } 228 sc->sc_ebuf = sc->sc_rbuf + (EPCOM_RING_SIZE << 1); 229 sc->sc_tbc = 0; 230 231 sc->sc_lcrlo = EPCOMSPEED2BRD(DEFAULT_COMSPEED) & 0xff; 232 sc->sc_lcrmid = EPCOMSPEED2BRD(DEFAULT_COMSPEED) >> 8; 233 sc->sc_lcrhi = cflag2lcrhi(CS8); /* 8N1 */ 234 235 tty_attach(tp); 236 237 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 238 int maj; 239 240 /* locate the major number */ 241 maj = cdevsw_lookup_major(&epcom_cdevsw); 242 243 cn_tab->cn_dev = makedev(maj, sc->sc_dev.dv_unit); 244 245 aprint_normal("%s: console\n", sc->sc_dev.dv_xname); 246 } 247 248 sc->sc_si = softintr_establish(IPL_SOFTSERIAL, epcomsoft, sc); 249 250 #if NRND > 0 && defined(RND_COM) 251 rnd_attach_source(&sc->rnd_source, sc->sc_dev.dv_xname, 252 RND_TYPE_TTY, 0); 253 #endif 254 255 /* if there are no enable/disable functions, assume the device 256 is always enabled */ 257 if (!sc->enable) 258 sc->enabled = 1; 259 260 /* XXX configure register */ 261 /* xxx_config(sc) */ 262 263 SET(sc->sc_hwflags, COM_HW_DEV_OK); 264 } 265 266 static int 267 epcomparam(struct tty *tp, struct termios *t) 268 { 269 struct epcom_softc *sc 270 = device_lookup(&epcom_cd, COMUNIT(tp->t_dev)); 271 int s; 272 273 if (COM_ISALIVE(sc) == 0) 274 return (EIO); 275 276 if (t->c_ispeed && t->c_ispeed != t->c_ospeed) 277 return (EINVAL); 278 279 /* 280 * For the console, always force CLOCAL and !HUPCL, so that the port 281 * is always active. 282 */ 283 if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) || 284 ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 285 SET(t->c_cflag, CLOCAL); 286 CLR(t->c_cflag, HUPCL); 287 } 288 289 /* 290 * If there were no changes, don't do anything. This avoids dropping 291 * input and improves performance when all we did was frob things like 292 * VMIN and VTIME. 293 */ 294 if (tp->t_ospeed == t->c_ospeed && 295 tp->t_cflag == t->c_cflag) 296 return (0); 297 298 s = splserial(); 299 300 sc->sc_lcrhi = cflag2lcrhi(t->c_cflag); 301 sc->sc_lcrlo = EPCOMSPEED2BRD(t->c_ospeed) & 0xff; 302 sc->sc_lcrmid = EPCOMSPEED2BRD(t->c_ospeed) >> 8; 303 304 /* And copy to tty. */ 305 tp->t_ispeed = 0; 306 tp->t_ospeed = t->c_ospeed; 307 tp->t_cflag = t->c_cflag; 308 epcom_set(sc); 309 310 splx(s); 311 312 /* 313 * Update the tty layer's idea of the carrier bit. 314 * We tell tty the carrier is always on. 315 */ 316 (void) (*tp->t_linesw->l_modem)(tp, 1); 317 318 #ifdef COM_DEBUG 319 if (com_debug) 320 comstatus(sc, "comparam "); 321 #endif 322 323 if (!ISSET(t->c_cflag, CHWFLOW)) { 324 if (sc->sc_tx_stopped) { 325 sc->sc_tx_stopped = 0; 326 epcomstart(tp); 327 } 328 } 329 330 return (0); 331 } 332 333 static int 334 epcomhwiflow(struct tty *tp, int block) 335 { 336 return (0); 337 } 338 339 static void 340 epcom_filltx(struct epcom_softc *sc) 341 { 342 bus_space_tag_t iot = sc->sc_iot; 343 bus_space_handle_t ioh = sc->sc_ioh; 344 int n; 345 346 n = 0; 347 while ((bus_space_read_4(iot, ioh, EPCOM_Flag) & Flag_TXFF) == 0) { 348 if (n >= sc->sc_tbc) 349 break; 350 bus_space_write_4(iot, ioh, EPCOM_Data, 351 0xff & *(sc->sc_tba + n)); 352 n++; 353 } 354 sc->sc_tbc -= n; 355 sc->sc_tba += n; 356 } 357 358 static void 359 epcomstart(struct tty *tp) 360 { 361 struct epcom_softc *sc 362 = device_lookup(&epcom_cd, COMUNIT(tp->t_dev)); 363 int s; 364 365 if (COM_ISALIVE(sc) == 0) 366 return; 367 368 s = spltty(); 369 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 370 goto out; 371 if (sc->sc_tx_stopped) 372 goto out; 373 374 if (tp->t_outq.c_cc <= tp->t_lowat) { 375 if (ISSET(tp->t_state, TS_ASLEEP)) { 376 CLR(tp->t_state, TS_ASLEEP); 377 wakeup(&tp->t_outq); 378 } 379 selwakeup(&tp->t_wsel); 380 if (tp->t_outq.c_cc == 0) 381 goto out; 382 } 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(); 393 394 sc->sc_tba = tba; 395 sc->sc_tbc = tbc; 396 } 397 398 SET(tp->t_state, TS_BUSY); 399 sc->sc_tx_busy = 1; 400 401 /* Output the first chunk of the contiguous buffer. */ 402 epcom_filltx(sc); 403 404 if (!ISSET(sc->sc_ctrl, Ctrl_TIE)) { 405 SET(sc->sc_ctrl, Ctrl_TIE); 406 epcom_set(sc); 407 } 408 409 out: 410 splx(s); 411 return; 412 } 413 414 static void 415 epcom_break(struct epcom_softc *sc, int onoff) 416 { 417 if (onoff) 418 SET(sc->sc_lcrhi, LinCtrlHigh_BRK); 419 else 420 CLR(sc->sc_lcrhi, LinCtrlHigh_BRK); 421 epcom_set(sc); 422 } 423 424 static void 425 epcom_shutdown(struct epcom_softc *sc) 426 { 427 int s; 428 429 s = splserial(); 430 431 /* Turn off interrupts. */ 432 CLR(sc->sc_ctrl, (Ctrl_TIE|Ctrl_RTIE|Ctrl_RIE)); 433 434 /* Clear any break condition set with TIOCSBRK. */ 435 epcom_break(sc, 0); 436 epcom_set(sc); 437 438 if (sc->disable) { 439 #ifdef DIAGNOSTIC 440 if (!sc->enabled) 441 panic("epcom_shutdown: not enabled?"); 442 #endif 443 (*sc->disable)(sc); 444 sc->enabled = 0; 445 } 446 splx(s); 447 } 448 449 int 450 epcomopen(dev_t dev, int flag, int mode, struct lwp *l) 451 { 452 struct epcom_softc *sc; 453 struct tty *tp; 454 int s, s2; 455 int error; 456 457 sc = device_lookup(&epcom_cd, COMUNIT(dev)); 458 if (sc == NULL || !ISSET(sc->sc_hwflags, COM_HW_DEV_OK) || 459 sc->sc_rbuf == NULL) 460 return (ENXIO); 461 462 if (ISSET(sc->sc_dev.dv_flags, DVF_ACTIVE) == 0) 463 return (ENXIO); 464 465 #ifdef KGDB 466 /* 467 * If this is the kgdb port, no other use is permitted. 468 */ 469 if (ISSET(sc->sc_hwflags, COM_HW_KGDB)) 470 return (EBUSY); 471 #endif 472 473 tp = sc->sc_tty; 474 475 if (ISSET(tp->t_state, TS_ISOPEN) && 476 ISSET(tp->t_state, TS_XCLUDE) && 477 suser(l->l_proc->p_ucred, &l->l_proc->p_acflag) != 0) 478 return (EBUSY); 479 480 s = spltty(); 481 482 /* 483 * Do the following iff this is a first open. 484 */ 485 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 486 struct termios t; 487 488 tp->t_dev = dev; 489 490 s2 = splserial(); 491 492 if (sc->enable) { 493 if ((*sc->enable)(sc)) { 494 splx(s2); 495 splx(s); 496 printf("%s: device enable failed\n", 497 sc->sc_dev.dv_xname); 498 return (EIO); 499 } 500 sc->enabled = 1; 501 #if 0 502 /* XXXXXXXXXXXXXXX */ 503 com_config(sc); 504 #endif 505 } 506 507 /* Turn on interrupts. */ 508 SET(sc->sc_ctrl, (Ctrl_UARTE|Ctrl_RIE|Ctrl_RTIE)); 509 epcom_set(sc); 510 511 #if 0 512 /* Fetch the current modem control status, needed later. */ 513 sc->sc_msr = bus_space_read_1(sc->sc_iot, sc->sc_ioh, com_msr); 514 515 /* Clear PPS capture state on first open. */ 516 sc->sc_ppsmask = 0; 517 sc->ppsparam.mode = 0; 518 #endif 519 520 splx(s2); 521 522 /* 523 * Initialize the termios status to the defaults. Add in the 524 * sticky bits from TIOCSFLAGS. 525 */ 526 t.c_ispeed = 0; 527 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 528 t.c_ospeed = epcomcn_sc.sc_ospeed; 529 t.c_cflag = epcomcn_sc.sc_cflag; 530 } else { 531 t.c_ospeed = TTYDEF_SPEED; 532 t.c_cflag = TTYDEF_CFLAG; 533 } 534 if (ISSET(sc->sc_swflags, TIOCFLAG_CLOCAL)) 535 SET(t.c_cflag, CLOCAL); 536 if (ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS)) 537 SET(t.c_cflag, CRTSCTS); 538 if (ISSET(sc->sc_swflags, TIOCFLAG_MDMBUF)) 539 SET(t.c_cflag, MDMBUF); 540 /* Make sure epcomparam() will do something. */ 541 tp->t_ospeed = 0; 542 (void) epcomparam(tp, &t); 543 tp->t_iflag = TTYDEF_IFLAG; 544 tp->t_oflag = TTYDEF_OFLAG; 545 tp->t_lflag = TTYDEF_LFLAG; 546 ttychars(tp); 547 ttsetwater(tp); 548 549 s2 = splserial(); 550 551 /* Clear the input ring, and unblock. */ 552 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 553 sc->sc_rbavail = EPCOM_RING_SIZE; 554 epcom_iflush(sc); 555 CLR(sc->sc_rx_flags, RX_ANY_BLOCK); 556 557 #ifdef COM_DEBUG 558 if (epcom_debug) 559 comstatus(sc, "epcomopen "); 560 #endif 561 562 splx(s2); 563 } 564 565 splx(s); 566 567 error = ttyopen(tp, COMDIALOUT(dev), ISSET(flag, O_NONBLOCK)); 568 if (error) 569 goto bad; 570 571 error = (*tp->t_linesw->l_open)(dev, tp); 572 if (error) 573 goto bad; 574 575 return (0); 576 577 bad: 578 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 579 /* 580 * We failed to open the device, and nobody else had it opened. 581 * Clean up the state as appropriate. 582 */ 583 epcom_shutdown(sc); 584 } 585 586 return (error); 587 } 588 589 int 590 epcomclose(dev_t dev, int flag, int mode, struct lwp *l) 591 { 592 struct epcom_softc *sc = device_lookup(&epcom_cd, COMUNIT(dev)); 593 struct tty *tp = sc->sc_tty; 594 595 /* XXX This is for cons.c. */ 596 if (!ISSET(tp->t_state, TS_ISOPEN)) 597 return (0); 598 599 (*tp->t_linesw->l_close)(tp, flag); 600 ttyclose(tp); 601 602 if (COM_ISALIVE(sc) == 0) 603 return (0); 604 605 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 606 /* 607 * Although we got a last close, the device may still be in 608 * use; e.g. if this was the dialout node, and there are still 609 * processes waiting for carrier on the non-dialout node. 610 */ 611 epcom_shutdown(sc); 612 } 613 614 return (0); 615 } 616 617 int 618 epcomread(dev_t dev, struct uio *uio, int flag) 619 { 620 struct epcom_softc *sc = device_lookup(&epcom_cd, COMUNIT(dev)); 621 struct tty *tp = sc->sc_tty; 622 623 if (COM_ISALIVE(sc) == 0) 624 return (EIO); 625 626 return ((*tp->t_linesw->l_read)(tp, uio, flag)); 627 } 628 629 int 630 epcomwrite(dev_t dev, struct uio *uio, int flag) 631 { 632 struct epcom_softc *sc = device_lookup(&epcom_cd, COMUNIT(dev)); 633 struct tty *tp = sc->sc_tty; 634 635 if (COM_ISALIVE(sc) == 0) 636 return (EIO); 637 638 return ((*tp->t_linesw->l_write)(tp, uio, flag)); 639 } 640 641 int 642 epcompoll(dev_t dev, int events, struct lwp *l) 643 { 644 struct epcom_softc *sc = device_lookup(&epcom_cd, COMUNIT(dev)); 645 struct tty *tp = sc->sc_tty; 646 647 if (COM_ISALIVE(sc) == 0) 648 return (EIO); 649 650 return ((*tp->t_linesw->l_poll)(tp, events, l)); 651 } 652 653 struct tty * 654 epcomtty(dev_t dev) 655 { 656 struct epcom_softc *sc = device_lookup(&epcom_cd, COMUNIT(dev)); 657 struct tty *tp = sc->sc_tty; 658 659 return (tp); 660 } 661 662 int 663 epcomioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct lwp *l) 664 { 665 struct epcom_softc *sc = device_lookup(&epcom_cd, COMUNIT(dev)); 666 struct tty *tp = sc->sc_tty; 667 int error; 668 int s; 669 670 if (COM_ISALIVE(sc) == 0) 671 return (EIO); 672 673 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 674 if (error != EPASSTHROUGH) 675 return (error); 676 677 error = ttioctl(tp, cmd, data, flag, l); 678 if (error != EPASSTHROUGH) 679 return (error); 680 681 error = 0; 682 683 s = splserial(); 684 685 switch (cmd) { 686 case TIOCSBRK: 687 epcom_break(sc, 1); 688 break; 689 690 case TIOCCBRK: 691 epcom_break(sc, 0); 692 break; 693 694 case TIOCGFLAGS: 695 *(int *)data = sc->sc_swflags; 696 break; 697 698 case TIOCSFLAGS: 699 error = suser(l->l_proc->p_ucred, &l->l_proc->p_acflag); 700 if (error) 701 break; 702 sc->sc_swflags = *(int *)data; 703 break; 704 705 default: 706 error = EPASSTHROUGH; 707 break; 708 } 709 710 splx(s); 711 712 return (error); 713 } 714 715 /* 716 * Stop output on a line. 717 */ 718 void 719 epcomstop(struct tty *tp, int flag) 720 { 721 struct epcom_softc *sc 722 = device_lookup(&epcom_cd, COMUNIT(tp->t_dev)); 723 int s; 724 725 s = splserial(); 726 if (ISSET(tp->t_state, TS_BUSY)) { 727 /* Stop transmitting at the next chunk. */ 728 sc->sc_tbc = 0; 729 if (!ISSET(tp->t_state, TS_TTSTOP)) 730 SET(tp->t_state, TS_FLUSH); 731 } 732 splx(s); 733 } 734 735 static u_int 736 cflag2lcrhi(tcflag_t cflag) 737 { 738 u_int lcrhi; 739 740 switch (cflag & CSIZE) { 741 case CS7: 742 lcrhi = 0x40; 743 break; 744 case CS6: 745 lcrhi = 0x20; 746 break; 747 case CS8: 748 default: 749 lcrhi = 0x60; 750 break; 751 } 752 lcrhi |= (cflag & PARENB) ? LinCtrlHigh_PEN : 0; 753 lcrhi |= (cflag & PARODD) ? 0 : LinCtrlHigh_EPS; 754 lcrhi |= (cflag & CSTOPB) ? LinCtrlHigh_STP2 : 0; 755 lcrhi |= LinCtrlHigh_FEN; /* FIFO always enabled */ 756 757 return (lcrhi); 758 } 759 760 static void 761 epcom_iflush(struct epcom_softc *sc) 762 { 763 bus_space_tag_t iot = sc->sc_iot; 764 bus_space_handle_t ioh = sc->sc_ioh; 765 #ifdef DIAGNOSTIC 766 int reg; 767 #endif 768 int timo; 769 770 #ifdef DIAGNOSTIC 771 reg = 0xffff; 772 #endif 773 timo = 50000; 774 /* flush any pending I/O */ 775 while ((bus_space_read_4(iot, ioh, EPCOM_Flag) & Flag_RXFE) == 0 776 && --timo) 777 #ifdef DIAGNOSTIC 778 reg = 779 #else 780 (void) 781 #endif 782 bus_space_read_4(iot, ioh, EPCOM_Data); 783 #ifdef DIAGNOSTIC 784 if (!timo) 785 printf("%s: com_iflush timeout %02x\n", sc->sc_dev.dv_xname, 786 reg); 787 #endif 788 } 789 790 static void 791 epcom_set(struct epcom_softc *sc) 792 { 793 bus_space_write_4(sc->sc_iot, sc->sc_ioh, EPCOM_LinCtrlLow, 794 sc->sc_lcrlo); 795 bus_space_write_4(sc->sc_iot, sc->sc_ioh, EPCOM_LinCtrlMid, 796 sc->sc_lcrmid); 797 bus_space_write_4(sc->sc_iot, sc->sc_ioh, EPCOM_LinCtrlHigh, 798 sc->sc_lcrhi); 799 bus_space_write_4(sc->sc_iot, sc->sc_ioh, EPCOM_Ctrl, 800 sc->sc_ctrl); 801 } 802 803 int 804 epcomcnattach(bus_space_tag_t iot, bus_addr_t iobase, bus_space_handle_t ioh, 805 int ospeed, tcflag_t cflag) 806 { 807 u_int lcrlo, lcrmid, lcrhi, ctrl, pwrcnt; 808 bus_space_handle_t syscon_ioh; 809 810 cn_tab = &epcomcons; 811 cn_init_magic(&epcom_cnm_state); 812 cn_set_magic("\047\001"); 813 814 epcomcn_sc.sc_iot = iot; 815 epcomcn_sc.sc_ioh = ioh; 816 epcomcn_sc.sc_hwbase = iobase; 817 epcomcn_sc.sc_ospeed = ospeed; 818 epcomcn_sc.sc_cflag = cflag; 819 820 lcrhi = cflag2lcrhi(cflag); 821 lcrlo = EPCOMSPEED2BRD(ospeed) & 0xff; 822 lcrmid = EPCOMSPEED2BRD(ospeed) >> 8; 823 ctrl = Ctrl_UARTE; 824 825 bus_space_map(iot, EP93XX_APB_HWBASE + EP93XX_APB_SYSCON, 826 EP93XX_APB_SYSCON_SIZE, 0, &syscon_ioh); 827 pwrcnt = bus_space_read_4(iot, syscon_ioh, EP93XX_SYSCON_PwrCnt); 828 pwrcnt &= ~(PwrCnt_UARTBAUD); 829 bus_space_write_4(iot, syscon_ioh, EP93XX_SYSCON_PwrCnt, pwrcnt); 830 bus_space_unmap(iot, syscon_ioh, EP93XX_APB_SYSCON_SIZE); 831 832 bus_space_write_4(iot, ioh, EPCOM_LinCtrlLow, lcrlo); 833 bus_space_write_4(iot, ioh, EPCOM_LinCtrlMid, lcrmid); 834 bus_space_write_4(iot, ioh, EPCOM_LinCtrlHigh, lcrhi); 835 bus_space_write_4(iot, ioh, EPCOM_Ctrl, ctrl); 836 837 return (0); 838 } 839 840 void 841 epcomcnprobe(struct consdev *cp) 842 { 843 cp->cn_pri = CN_REMOTE; 844 } 845 846 void 847 epcomcnpollc(dev_t dev, int on) 848 { 849 } 850 851 void 852 epcomcnputc(dev_t dev, int c) 853 { 854 int s; 855 bus_space_tag_t iot = epcomcn_sc.sc_iot; 856 bus_space_handle_t ioh = epcomcn_sc.sc_ioh; 857 858 s = splserial(); 859 860 while((bus_space_read_4(iot, ioh, EPCOM_Flag) & Flag_TXFF) != 0) 861 ; 862 863 bus_space_write_4(iot, ioh, EPCOM_Data, c); 864 865 #ifdef DEBUG 866 if (c == '\r') { 867 while((bus_space_read_4(iot, ioh, EPCOM_Flag) & Flag_TXFE) == 0) 868 ; 869 } 870 #endif 871 872 splx(s); 873 } 874 875 int 876 epcomcngetc(dev_t dev) 877 { 878 int c, sts; 879 int s; 880 bus_space_tag_t iot = epcomcn_sc.sc_iot; 881 bus_space_handle_t ioh = epcomcn_sc.sc_ioh; 882 883 s = splserial(); 884 885 while((bus_space_read_4(iot, ioh, EPCOM_Flag) & Flag_RXFE) != 0) 886 ; 887 888 c = bus_space_read_4(iot, ioh, EPCOM_Data); 889 sts = bus_space_read_4(iot, ioh, EPCOM_RXSts); 890 if (ISSET(sts, RXSts_BE)) c = CNC_BREAK; 891 #ifdef DDB 892 extern int db_active; 893 if (!db_active) 894 #endif 895 { 896 int cn_trapped = 0; /* unused */ 897 898 cn_check_magic(dev, c, epcom_cnm_state); 899 } 900 c &= 0xff; 901 splx(s); 902 903 return (c); 904 } 905 906 inline static void 907 epcom_txsoft(struct epcom_softc *sc, struct tty *tp) 908 { 909 CLR(tp->t_state, TS_BUSY); 910 if (ISSET(tp->t_state, TS_FLUSH)) 911 CLR(tp->t_state, TS_FLUSH); 912 else 913 ndflush(&tp->t_outq, (int)(sc->sc_tba - tp->t_outq.c_cf)); 914 (*tp->t_linesw->l_start)(tp); 915 } 916 917 inline static void 918 epcom_rxsoft(struct epcom_softc *sc, struct tty *tp) 919 { 920 int (*rint) __P((int, struct tty *)) = tp->t_linesw->l_rint; 921 u_char *get, *end; 922 u_int cc, scc; 923 u_char sts; 924 int code; 925 int s; 926 927 end = sc->sc_ebuf; 928 get = sc->sc_rbget; 929 scc = cc = EPCOM_RING_SIZE - sc->sc_rbavail; 930 #if 0 931 if (cc == EPCOM_RING_SIZE) { 932 sc->sc_floods++; 933 if (sc->sc_errors++ == 0) 934 callout_reset(&sc->sc_diag_callout, 60 * hz, 935 comdiag, sc); 936 } 937 #endif 938 while (cc) { 939 code = get[0]; 940 sts = get[1]; 941 if (ISSET(sts, RXSts_OE | RXSts_FE | RXSts_PE | RXSts_BE)) { 942 #if 0 943 if (ISSET(lsr, DR_ROR)) { 944 sc->sc_overflows++; 945 if (sc->sc_errors++ == 0) 946 callout_reset(&sc->sc_diag_callout, 947 60 * hz, comdiag, sc); 948 } 949 #endif 950 if (ISSET(sts, (RXSts_FE|RXSts_BE))) 951 SET(code, TTY_FE); 952 if (ISSET(sts, RXSts_PE)) 953 SET(code, TTY_PE); 954 } 955 if ((*rint)(code, tp) == -1) { 956 /* 957 * The line discipline's buffer is out of space. 958 */ 959 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 960 /* 961 * We're either not using flow control, or the 962 * line discipline didn't tell us to block for 963 * some reason. Either way, we have no way to 964 * know when there's more space available, so 965 * just drop the rest of the data. 966 */ 967 get += cc << 1; 968 if (get >= end) 969 get -= EPCOM_RING_SIZE << 1; 970 cc = 0; 971 } else { 972 /* 973 * Don't schedule any more receive processing 974 * until the line discipline tells us there's 975 * space available (through comhwiflow()). 976 * Leave the rest of the data in the input 977 * buffer. 978 */ 979 SET(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 980 } 981 break; 982 } 983 get += 2; 984 if (get >= end) 985 get = sc->sc_rbuf; 986 cc--; 987 } 988 989 if (cc != scc) { 990 sc->sc_rbget = get; 991 s = splserial(); 992 993 cc = sc->sc_rbavail += scc - cc; 994 /* Buffers should be ok again, release possible block. */ 995 if (cc >= 1) { 996 if (ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 997 CLR(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 998 SET(sc->sc_ctrl, (Ctrl_RIE|Ctrl_RTIE)); 999 epcom_set(sc); 1000 } 1001 if (ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED)) { 1002 CLR(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1003 #if 0 1004 com_hwiflow(sc); 1005 #endif 1006 } 1007 } 1008 splx(s); 1009 } 1010 } 1011 1012 static void 1013 epcomsoft(void* arg) 1014 { 1015 struct epcom_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 epcom_rxsoft(sc, sc->sc_tty); 1023 } 1024 if (sc->sc_tx_done) { 1025 sc->sc_tx_done = 0; 1026 epcom_txsoft(sc, sc->sc_tty); 1027 } 1028 } 1029 1030 int 1031 epcomintr(void* arg) 1032 { 1033 struct epcom_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 flagr; 1039 u_int intr; 1040 u_int32_t c, csts; 1041 1042 intr = bus_space_read_4(iot, ioh, EPCOM_IntIDIntClr); 1043 1044 if (COM_ISALIVE(sc) == 0) 1045 panic("intr on disabled epcom"); 1046 1047 flagr = bus_space_read_4(iot, ioh, EPCOM_Flag); 1048 1049 end = sc->sc_ebuf; 1050 put = sc->sc_rbput; 1051 cc = sc->sc_rbavail; 1052 1053 if (!(ISSET(flagr, Flag_RXFE))) { 1054 if (!ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1055 while (cc > 0) { 1056 if (ISSET(flagr, Flag_RXFE)) 1057 break; 1058 c = bus_space_read_4(iot, ioh, EPCOM_Data); 1059 csts = bus_space_read_4(iot, ioh, EPCOM_RXSts); 1060 if (ISSET(csts, RXSts_BE)) { 1061 int cn_trapped = 0; 1062 1063 cn_check_magic(sc->sc_tty->t_dev, 1064 CNC_BREAK, epcom_cnm_state); 1065 if (cn_trapped) 1066 goto next; 1067 #if defined(KGDB) && !defined(DDB) 1068 if (ISSET(sc->sc_hwflags, COM_HW_KGDB)){ 1069 kgdb_connect(1); 1070 goto next; 1071 } 1072 #endif 1073 } else { 1074 int cn_trapped = 0; 1075 1076 cn_check_magic(sc->sc_tty->t_dev, 1077 (c & 0xff), epcom_cnm_state); 1078 if (cn_trapped) 1079 goto next; 1080 } 1081 1082 1083 put[0] = c & 0xff; 1084 put[1] = csts & 0xf; 1085 put += 2; 1086 if (put >= end) 1087 put = sc->sc_rbuf; 1088 cc--; 1089 next: 1090 flagr = bus_space_read_4(iot, ioh, EPCOM_Flag); 1091 } 1092 1093 /* 1094 * Current string of incoming characters ended because 1095 * no more data was available or we ran out of space. 1096 * Schedule a receive event if any data was received. 1097 * If we're out of space, turn off receive interrupts. 1098 */ 1099 sc->sc_rbput = put; 1100 sc->sc_rbavail = cc; 1101 if (!ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) 1102 sc->sc_rx_ready = 1; 1103 1104 /* 1105 * See if we are in danger of overflowing a buffer. If 1106 * so, use hardware flow control to ease the pressure. 1107 */ 1108 1109 /* but epcom cannot. X-( */ 1110 1111 /* 1112 * If we're out of space, disable receive interrupts 1113 * until the queue has drained a bit. 1114 */ 1115 if (!cc) { 1116 SET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1117 CLR(sc->sc_ctrl, (Ctrl_RIE|Ctrl_RTIE)); 1118 epcom_set(sc); 1119 } 1120 } else { 1121 #ifdef DIAGNOSTIC 1122 panic("epcomintr: we shouldn't reach here"); 1123 #endif 1124 CLR(sc->sc_ctrl, (Ctrl_RIE|Ctrl_RTIE)); 1125 epcom_set(sc); 1126 } 1127 } 1128 1129 /* 1130 * Done handling any receive interrupts. See if data can be 1131 * transmitted as well. Schedule tx done event if no data left 1132 * and tty was marked busy. 1133 */ 1134 1135 if (!ISSET(flagr, Flag_TXFF) && sc->sc_tbc > 0) { 1136 /* Output the next chunk of the contiguous buffer, if any. */ 1137 epcom_filltx(sc); 1138 } else { 1139 /* Disable transmit completion interrupts if necessary. */ 1140 if (ISSET(sc->sc_ctrl, Ctrl_TIE)) { 1141 CLR(sc->sc_ctrl, Ctrl_TIE); 1142 epcom_set(sc); 1143 } 1144 if (sc->sc_tx_busy) { 1145 sc->sc_tx_busy = 0; 1146 sc->sc_tx_done = 1; 1147 } 1148 } 1149 1150 /* Wake up the poller. */ 1151 softintr_schedule(sc->sc_si); 1152 1153 #if 0 /* XXX: broken */ 1154 #if NRND > 0 && defined(RND_COM) 1155 rnd_add_uint32(&sc->rnd_source, intr ^ flagr); 1156 #endif 1157 #endif 1158 return (1); 1159 } 1160
Indexes created Tue Sep 23 13:09:54 GMT 2025