z8530tty.c revision 1.28
1/* $NetBSD: z8530tty.c,v 1.28 1997/11/01 20:40:36 mycroft Exp $ */ 2 3/*- 4 * Copyright (c) 1993, 1994, 1995, 1996, 1997 5 * Charles M. Hannum. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by Charles M. Hannum. 18 * 4. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33/* 34 * Copyright (c) 1994 Gordon W. Ross 35 * Copyright (c) 1992, 1993 36 * The Regents of the University of California. All rights reserved. 37 * 38 * This software was developed by the Computer Systems Engineering group 39 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 40 * contributed to Berkeley. 41 * 42 * All advertising materials mentioning features or use of this software 43 * must display the following acknowledgement: 44 * This product includes software developed by the University of 45 * California, Lawrence Berkeley Laboratory. 46 * 47 * Redistribution and use in source and binary forms, with or without 48 * modification, are permitted provided that the following conditions 49 * are met: 50 * 1. Redistributions of source code must retain the above copyright 51 * notice, this list of conditions and the following disclaimer. 52 * 2. Redistributions in binary form must reproduce the above copyright 53 * notice, this list of conditions and the following disclaimer in the 54 * documentation and/or other materials provided with the distribution. 55 * 3. All advertising materials mentioning features or use of this software 56 * must display the following acknowledgement: 57 * This product includes software developed by the University of 58 * California, Berkeley and its contributors. 59 * 4. 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 * @(#)zs.c 8.1 (Berkeley) 7/19/93 76 */ 77 78/* 79 * Zilog Z8530 Dual UART driver (tty interface) 80 * 81 * This is the "slave" driver that will be attached to 82 * the "zsc" driver for plain "tty" async. serial lines. 83 * 84 * Credits, history: 85 * 86 * The original version of this code was the sparc/dev/zs.c driver 87 * as distributed with the Berkeley 4.4 Lite release. Since then, 88 * Gordon Ross reorganized the code into the current parent/child 89 * driver scheme, separating the Sun keyboard and mouse support 90 * into independent child drivers. 91 * 92 * RTS/CTS flow-control support was a collaboration of: 93 * Gordon Ross <gwr@netbsd.org>, 94 * Bill Studenmund <wrstuden@loki.stanford.edu> 95 * Ian Dall <Ian.Dall@dsto.defence.gov.au> 96 */ 97 98#include <sys/param.h> 99#include <sys/systm.h> 100#include <sys/proc.h> 101#include <sys/device.h> 102#include <sys/conf.h> 103#include <sys/file.h> 104#include <sys/ioctl.h> 105#include <sys/malloc.h> 106#include <sys/tty.h> 107#include <sys/time.h> 108#include <sys/kernel.h> 109#include <sys/syslog.h> 110 111#include <dev/ic/z8530reg.h> 112#include <machine/z8530var.h> 113 114#include "locators.h" 115 116/* 117 * How many input characters we can buffer. 118 * The port-specific var.h may override this. 119 * Note: must be a power of two! 120 */ 121#ifndef ZSTTY_RING_SIZE 122#define ZSTTY_RING_SIZE 2048 123#endif 124 125/* 126 * Make this an option variable one can patch. 127 * But be warned: this must be a power of 2! 128 */ 129int zstty_rbuf_size = ZSTTY_RING_SIZE; 130 131/* This should usually be 3/4 of ZSTTY_RING_SIZE */ 132int zstty_rbuf_hiwat = (ZSTTY_RING_SIZE - (ZSTTY_RING_SIZE >> 2)); 133 134struct zstty_softc { 135 struct device zst_dev; /* required first: base device */ 136 struct tty *zst_tty; 137 struct zs_chanstate *zst_cs; 138 139 int zst_hwflags; /* see z8530var.h */ 140 int zst_swflags; /* TIOCFLAG_SOFTCAR, ... <ttycom.h> */ 141 142 /* 143 * Printing an overrun error message often takes long enough to 144 * cause another overrun, so we only print one per second. 145 */ 146 long zst_rotime; /* time of last ring overrun */ 147 long zst_fotime; /* time of last fifo overrun */ 148 149 /* 150 * The receive ring buffer. 151 */ 152 int zst_rbget; /* ring buffer `get' index */ 153 volatile int zst_rbput; /* ring buffer `put' index */ 154 int zst_ringmask; 155 int zst_rbhiwat; 156 157 u_short *zst_rbuf; /* rr1, data pairs */ 158 159 /* 160 * The transmit byte count and address are used for pseudo-DMA 161 * output in the hardware interrupt code. PDMA can be suspended 162 * to get pending changes done; heldtbc is used for this. It can 163 * also be stopped for ^S; this sets TS_TTSTOP in tp->t_state. 164 */ 165 int zst_tbc; /* transmit byte count */ 166 u_char *zst_tba; /* transmit buffer address */ 167 int zst_heldtbc; /* held tbc while xmission stopped */ 168 169 /* Flags to communicate with zstty_softint() */ 170 volatile char zst_rx_blocked; /* input block at ring */ 171 volatile char zst_rx_overrun; /* ring overrun */ 172 volatile char zst_tx_busy; /* working on an output chunk */ 173 volatile char zst_tx_done; /* done with one output chunk */ 174 volatile char zst_tx_stopped; /* H/W level stop (lost CTS) */ 175 volatile char zst_st_check; /* got a status interrupt */ 176 char pad[2]; 177}; 178 179 180/* Definition of the driver for autoconfig. */ 181#ifdef __BROKEN_INDIRECT_CONFIG 182static int zstty_match(struct device *, void *, void *); 183#else 184static int zstty_match(struct device *, struct cfdata *, void *); 185#endif 186static void zstty_attach(struct device *, struct device *, void *); 187 188struct cfattach zstty_ca = { 189 sizeof(struct zstty_softc), zstty_match, zstty_attach 190}; 191 192struct cfdriver zstty_cd = { 193 NULL, "zstty", DV_TTY 194}; 195 196struct zsops zsops_tty; 197 198/* Routines called from other code. */ 199cdev_decl(zs); /* open, close, read, write, ioctl, stop, ... */ 200 201static void zsstart __P((struct tty *)); 202static int zsparam __P((struct tty *, struct termios *)); 203static void zs_modem __P((struct zstty_softc *zst, int onoff)); 204static int zshwiflow __P((struct tty *, int)); 205static void zs_hwiflow __P((struct zstty_softc *)); 206 207/* 208 * zstty_match: how is this zs channel configured? 209 */ 210#ifdef __BROKEN_INDIRECT_CONFIG 211int 212zstty_match(parent, vcf, aux) 213 struct device *parent; 214 void *vcf, *aux; 215{ 216 struct cfdata *cf = vcf; 217 struct zsc_attach_args *args = aux; 218 219 /* Exact match is better than wildcard. */ 220 if (cf->cf_loc[ZSCCF_CHANNEL] == args->channel) 221 return 2; 222 223 /* This driver accepts wildcard. */ 224 if (cf->cf_loc[ZSCCF_CHANNEL] == ZSCCF_CHANNEL_DEFAULT) 225 return 1; 226 227 return 0; 228} 229#else /* __BROKEN_INDIRECT_CONFIG */ 230int 231zstty_match(parent, cf, aux) 232 struct device *parent; 233 struct cfdata *cf; 234 void *aux; 235{ 236 struct zsc_attach_args *args = aux; 237 238 /* Exact match is better than wildcard. */ 239 if (cf->cf_loc[ZSCCF_CHANNEL] == args->channel) 240 return 2; 241 242 /* This driver accepts wildcard. */ 243 if (cf->cf_loc[ZSCCF_CHANNEL] == ZSCCF_CHANNEL_DEFAULT) 244 return 1; 245 246 return 0; 247} 248#endif /* __BROKEN_INDIRECT_CONFIG */ 249 250void 251zstty_attach(parent, self, aux) 252 struct device *parent, *self; 253 void *aux; 254 255{ 256 struct zsc_softc *zsc = (void *) parent; 257 struct zstty_softc *zst = (void *) self; 258 struct cfdata *cf = self->dv_cfdata; 259 struct zsc_attach_args *args = aux; 260 struct zs_chanstate *cs; 261 struct tty *tp; 262 int channel, tty_unit; 263 dev_t dev; 264 265 tty_unit = zst->zst_dev.dv_unit; 266 channel = args->channel; 267 cs = zsc->zsc_cs[channel]; 268 cs->cs_private = zst; 269 cs->cs_ops = &zsops_tty; 270 271 zst->zst_cs = cs; 272 zst->zst_swflags = cf->cf_flags; /* softcar, etc. */ 273 zst->zst_hwflags = args->hwflags; 274 dev = makedev(zs_major, tty_unit); 275 276 if (zst->zst_swflags) 277 printf(" flags 0x%x", zst->zst_swflags); 278 279 if (zst->zst_hwflags & ZS_HWFLAG_CONSOLE) 280 printf(" (console)"); 281 else { 282#ifdef KGDB 283 /* 284 * Allow kgdb to "take over" this port. Returns true 285 * if this serial port is in-use by kgdb. 286 */ 287 if (zs_check_kgdb(cs, dev)) { 288 printf(" (kgdb)\n"); 289 /* 290 * This is the kgdb port (exclusive use) 291 * so skip the normal attach code. 292 */ 293 return; 294 } 295#endif 296 } 297 printf("\n"); 298 299 tp = ttymalloc(); 300 tp->t_dev = dev; 301 tp->t_oproc = zsstart; 302 tp->t_param = zsparam; 303 tp->t_hwiflow = zshwiflow; 304 tty_attach(tp); 305 306 zst->zst_tty = tp; 307 zst->zst_rbhiwat = zstty_rbuf_size; /* impossible value */ 308 zst->zst_ringmask = zstty_rbuf_size - 1; 309 zst->zst_rbuf = malloc(zstty_rbuf_size * sizeof(zst->zst_rbuf[0]), 310 M_DEVBUF, M_WAITOK); 311 312 /* XXX - Do we need an MD hook here? */ 313 314 /* 315 * Hardware init 316 */ 317 if (zst->zst_hwflags & ZS_HWFLAG_CONSOLE) { 318 /* Call zsparam similar to open. */ 319 struct termios t; 320 321 /* Make console output work while closed. */ 322 zst->zst_swflags |= TIOCFLAG_SOFTCAR; 323 /* Setup the "new" parameters in t. */ 324 bzero((void*)&t, sizeof(t)); 325 t.c_cflag = cs->cs_defcflag; 326 t.c_ospeed = cs->cs_defspeed; 327 /* Enable interrupts. */ 328 cs->cs_preg[1] = ZSWR1_RIE | ZSWR1_SIE; 329 /* Make sure zsparam will see changes. */ 330 tp->t_ospeed = 0; 331 (void)zsparam(tp, &t); 332 } else { 333 /* Not the console; may need reset. */ 334 int reset, s; 335 reset = (channel == 0) ? 336 ZSWR9_A_RESET : ZSWR9_B_RESET; 337 s = splzs(); 338 zs_write_reg(cs, 9, reset); 339 splx(s); 340 } 341 342 /* 343 * Initialize state of modem control lines (DTR). 344 * If softcar is set, turn on DTR now and leave it. 345 * otherwise, turn off DTR now, and raise in open. 346 * (Keeps modem from answering too early.) 347 */ 348 zs_modem(zst, (zst->zst_swflags & TIOCFLAG_SOFTCAR) ? 1 : 0); 349} 350 351 352/* 353 * Return pointer to our tty. 354 */ 355struct tty * 356zstty(dev) 357 dev_t dev; 358{ 359 struct zstty_softc *zst; 360 int unit = minor(dev); 361 362#ifdef DIAGNOSTIC 363 if (unit >= zstty_cd.cd_ndevs) 364 panic("zstty"); 365#endif 366 zst = zstty_cd.cd_devs[unit]; 367 return (zst->zst_tty); 368} 369 370 371/* 372 * Open a zs serial (tty) port. 373 */ 374int 375zsopen(dev, flags, mode, p) 376 dev_t dev; 377 int flags; 378 int mode; 379 struct proc *p; 380{ 381 register struct tty *tp; 382 register struct zs_chanstate *cs; 383 struct zstty_softc *zst; 384 int error, s, s2, unit; 385 386 unit = minor(dev); 387 if (unit >= zstty_cd.cd_ndevs) 388 return (ENXIO); 389 zst = zstty_cd.cd_devs[unit]; 390 if (zst == NULL) 391 return (ENXIO); 392 tp = zst->zst_tty; 393 cs = zst->zst_cs; 394 395 /* If KGDB took the line, then tp==NULL */ 396 if (tp == NULL) 397 return (EBUSY); 398 399 if ((tp->t_state & TS_ISOPEN) != 0 && 400 (tp->t_state & TS_XCLUDE) != 0 && 401 p->p_ucred->cr_uid != 0) 402 return (EBUSY); 403 404 s = spltty(); 405 406 if ((tp->t_state & TS_ISOPEN) == 0) { 407 /* First open. */ 408 struct termios t; 409 410 s2 = splzs(); 411 412 /* Turn on interrupts. */ 413 cs->cs_creg[1] = cs->cs_preg[1] = ZSWR1_RIE | ZSWR1_SIE; 414 zs_write_reg(cs, 1, cs->cs_creg[1]); 415 416 /* Fetch the current modem control status, needed later. */ 417 cs->cs_rr0 = zs_read_csr(cs); 418 419 splx(s2); 420 421 /* 422 * Setup the "new" parameters in t. 423 * Can not use tp->t because zsparam 424 * deals only with what has changed. 425 */ 426 t.c_ispeed = 0; 427 t.c_ospeed = cs->cs_defspeed; 428 t.c_cflag = cs->cs_defcflag; 429 if (zst->zst_swflags & TIOCFLAG_CLOCAL) 430 t.c_cflag |= CLOCAL; 431 if (zst->zst_swflags & TIOCFLAG_CRTSCTS) 432 t.c_cflag |= CRTSCTS; 433 if (zst->zst_swflags & TIOCFLAG_MDMBUF) 434 t.c_cflag |= MDMBUF; 435 /* Make sure zsparam will see changes. */ 436 tp->t_ospeed = 0; 437 (void) zsparam(tp, &t); 438 /* 439 * Note: zsparam has done: cflag, ispeed, ospeed 440 * so we just need to do: iflag, oflag, lflag, cc 441 * For "raw" mode, just leave all zeros. 442 */ 443 if ((zst->zst_hwflags & ZS_HWFLAG_RAW) == 0) { 444 tp->t_iflag = TTYDEF_IFLAG; 445 tp->t_oflag = TTYDEF_OFLAG; 446 tp->t_lflag = TTYDEF_LFLAG; 447 } 448 ttychars(tp); 449 ttsetwater(tp); 450 451 s2 = splzs(); 452 453 /* 454 * Turn on DTR. We must always do this, even if carrier is not 455 * present, because otherwise we'd have to use TIOCSDTR 456 * immediately after setting CLOCAL, which applications do not 457 * expect. We always assert DTR while the device is open 458 * unless explicitly requested to deassert it. 459 */ 460 zs_modem(zst, 1); 461 462 /* Clear the input ring, and unblock. */ 463 zst->zst_rbget = zst->zst_rbput; 464 zs_iflush(cs); 465 zst->zst_rx_blocked = 0; 466 zs_hwiflow(zst); 467 468 splx(s2); 469 } 470 error = 0; 471 472 /* If we're doing a blocking open... */ 473 if ((flags & O_NONBLOCK) == 0) 474 /* ...then wait for carrier. */ 475 while ((tp->t_state & TS_CARR_ON) == 0 && 476 (tp->t_cflag & (CLOCAL | MDMBUF)) == 0) { 477 error = ttysleep(tp, &tp->t_rawq, TTIPRI | PCATCH, 478 ttopen, 0); 479 if (error) { 480 /* 481 * If the open was interrupted and nobody 482 * else has the device open, then hang up. 483 */ 484 if ((tp->t_state & TS_ISOPEN) == 0) { 485 zs_modem(zst, 0); 486 tp->t_state &= ~TS_WOPEN; 487 ttwakeup(tp); 488 } 489 break; 490 } 491 tp->t_state |= TS_WOPEN; 492 } 493 494 splx(s); 495 if (error == 0) 496 error = (*linesw[tp->t_line].l_open)(dev, tp); 497 return (error); 498} 499 500/* 501 * Close a zs serial port. 502 */ 503int 504zsclose(dev, flags, mode, p) 505 dev_t dev; 506 int flags; 507 int mode; 508 struct proc *p; 509{ 510 struct zstty_softc *zst; 511 register struct zs_chanstate *cs; 512 register struct tty *tp; 513 int s; 514 515 zst = zstty_cd.cd_devs[minor(dev)]; 516 cs = zst->zst_cs; 517 tp = zst->zst_tty; 518 519 /* XXX This is for cons.c. */ 520 if ((tp->t_state & TS_ISOPEN) == 0) 521 return 0; 522 523 (*linesw[tp->t_line].l_close)(tp, flags); 524 ttyclose(tp); 525 526 s = splzs(); 527 528 /* If we were asserting flow control, then deassert it. */ 529 zst->zst_rx_blocked = 1; 530 zs_hwiflow(zst); 531 /* Clear any break condition set with TIOCSBRK. */ 532 zs_break(cs, 0); 533 534 splx(s); 535 536 /* 537 * Hang up if necessary. Wait a bit, so the other side has time to 538 * notice even if we immediately open the port again. 539 */ 540 if ((tp->t_cflag & HUPCL) != 0) { 541 zs_modem(zst, 0); 542 (void) tsleep(cs, TTIPRI, ttclos, hz); 543 } 544 545 s = splzs(); 546 547 /* Turn off interrupts. */ 548 cs->cs_creg[1] = cs->cs_preg[1] = 0; 549 zs_write_reg(cs, 1, cs->cs_creg[1]); 550 551 splx(s); 552 553 return (0); 554} 555 556/* 557 * Read/write zs serial port. 558 */ 559int 560zsread(dev, uio, flags) 561 dev_t dev; 562 struct uio *uio; 563 int flags; 564{ 565 register struct zstty_softc *zst; 566 register struct tty *tp; 567 568 zst = zstty_cd.cd_devs[minor(dev)]; 569 tp = zst->zst_tty; 570 return (linesw[tp->t_line].l_read(tp, uio, flags)); 571} 572 573int 574zswrite(dev, uio, flags) 575 dev_t dev; 576 struct uio *uio; 577 int flags; 578{ 579 register struct zstty_softc *zst; 580 register struct tty *tp; 581 582 zst = zstty_cd.cd_devs[minor(dev)]; 583 tp = zst->zst_tty; 584 return (linesw[tp->t_line].l_write(tp, uio, flags)); 585} 586 587int 588zsioctl(dev, cmd, data, flag, p) 589 dev_t dev; 590 u_long cmd; 591 caddr_t data; 592 int flag; 593 struct proc *p; 594{ 595 register struct zstty_softc *zst; 596 register struct zs_chanstate *cs; 597 register struct tty *tp; 598 register struct linesw *line; 599 register int error; 600 601 zst = zstty_cd.cd_devs[minor(dev)]; 602 cs = zst->zst_cs; 603 tp = zst->zst_tty; 604 line = &linesw[tp->t_line]; 605 606 error = (*line->l_ioctl)(tp, cmd, data, flag, p); 607 if (error >= 0) 608 return (error); 609 610 error = ttioctl(tp, cmd, data, flag, p); 611 if (error >= 0) 612 return (error); 613 614#ifdef ZS_MD_IOCTL 615 error = ZS_MD_IOCTL; 616 if (error >= 0) 617 return (error); 618#endif /* ZS_MD_IOCTL */ 619 620 switch (cmd) { 621 case TIOCSBRK: 622 zs_break(cs, 1); 623 break; 624 625 case TIOCCBRK: 626 zs_break(cs, 0); 627 break; 628 629 case TIOCGFLAGS: 630 *(int *)data = zst->zst_swflags; 631 break; 632 633 case TIOCSFLAGS: 634 error = suser(p->p_ucred, &p->p_acflag); 635 if (error) 636 return (error); 637 zst->zst_swflags = *(int *)data; 638 break; 639 640 case TIOCSDTR: 641 zs_modem(zst, 1); 642 break; 643 644 case TIOCCDTR: 645 zs_modem(zst, 0); 646 break; 647 648 case TIOCMSET: 649 case TIOCMBIS: 650 case TIOCMBIC: 651 case TIOCMGET: 652 default: 653 return (ENOTTY); 654 } 655 return (0); 656} 657 658/* 659 * Start or restart transmission. 660 */ 661static void 662zsstart(tp) 663 register struct tty *tp; 664{ 665 register struct zstty_softc *zst; 666 register struct zs_chanstate *cs; 667 register int s; 668 669 zst = zstty_cd.cd_devs[minor(tp->t_dev)]; 670 cs = zst->zst_cs; 671 672 s = spltty(); 673 if ((tp->t_state & TS_BUSY) != 0) 674 goto out; 675 if ((tp->t_state & (TS_TIMEOUT | TS_TTSTOP)) != 0) 676 goto stopped; 677 678 if (zst->zst_tx_stopped) 679 goto stopped; 680 681 if (tp->t_outq.c_cc <= tp->t_lowat) { 682 if ((tp->t_state & TS_ASLEEP) != 0) { 683 tp->t_state &= ~TS_ASLEEP; 684 wakeup((caddr_t)&tp->t_outq); 685 } 686 selwakeup(&tp->t_wsel); 687 if (tp->t_outq.c_cc == 0) 688 goto stopped; 689 } 690 691 /* Grab the first contiguous region of buffer space. */ 692 { 693 u_char *tba; 694 int tbc; 695 696 tba = tp->t_outq.c_cf; 697 tbc = ndqb(&tp->t_outq, 0); 698 699 (void) splzs(); 700 701 zst->zst_tba = tba; 702 zst->zst_tbc = tbc; 703 } 704 705 tp->t_state |= TS_BUSY; 706 zst->zst_tx_busy = 1; 707 708 /* Enable transmit completion interrupts if necessary. */ 709 if ((cs->cs_preg[1] & ZSWR1_TIE) == 0) { 710 cs->cs_preg[1] |= ZSWR1_TIE; 711 cs->cs_creg[1] = cs->cs_preg[1]; 712 zs_write_reg(cs, 1, cs->cs_creg[1]); 713 } 714 715 /* Output the first character of the contiguous buffer. */ 716 zs_write_data(cs, *zst->zst_tba); 717 zst->zst_tbc--; 718 zst->zst_tba++; 719 splx(s); 720 return; 721 722stopped: 723 /* Disable transmit completion interrupts if necessary. */ 724 if ((cs->cs_preg[1] & ZSWR1_TIE) != 0) { 725 cs->cs_preg[1] &= ~ZSWR1_TIE; 726 cs->cs_creg[1] = cs->cs_preg[1]; 727 zs_write_reg(cs, 1, cs->cs_creg[1]); 728 } 729out: 730 splx(s); 731 return; 732} 733 734/* 735 * Stop output, e.g., for ^S or output flush. 736 */ 737void 738zsstop(tp, flag) 739 struct tty *tp; 740 int flag; 741{ 742 register struct zstty_softc *zst; 743 register struct zs_chanstate *cs; 744 register int s; 745 746 zst = zstty_cd.cd_devs[minor(tp->t_dev)]; 747 cs = zst->zst_cs; 748 749 s = splzs(); 750 if (tp->t_state & TS_BUSY) { 751 /* 752 * Device is transmitting; must stop it. 753 * Also clear _heldtbc to prevent any 754 * flow-control event from resuming. 755 */ 756 zst->zst_tbc = 0; 757 zst->zst_heldtbc = 0; 758 if ((tp->t_state & TS_TTSTOP) == 0) 759 tp->t_state |= TS_FLUSH; 760 } 761 splx(s); 762} 763 764/* 765 * Set ZS tty parameters from termios. 766 * XXX - Should just copy the whole termios after 767 * making sure all the changes could be done. 768 */ 769static int 770zsparam(tp, t) 771 register struct tty *tp; 772 register struct termios *t; 773{ 774 struct zstty_softc *zst; 775 struct zs_chanstate *cs; 776 register struct linesw *line; 777 int s, bps, cflag, error; 778 u_char tmp3, tmp4, tmp5; 779 780 zst = zstty_cd.cd_devs[minor(tp->t_dev)]; 781 cs = zst->zst_cs; 782 line = &linesw[tp->t_line]; 783 bps = t->c_ospeed; 784 cflag = t->c_cflag; 785 786 if (bps < 0 || (t->c_ispeed && t->c_ispeed != bps)) 787 return (EINVAL); 788 789 /* 790 * For the console, always force CLOCAL and !HUPCL, so that the port 791 * is always active. 792 */ 793 if ((zst->zst_swflags & TIOCFLAG_SOFTCAR) != 0 || 794 (zst->zst_hwflags & (ZS_HWFLAG_NO_DCD | ZS_HWFLAG_CONSOLE)) != 0) { 795 t->c_cflag |= CLOCAL; 796 t->c_cflag &= ~HUPCL; 797 } 798 799 /* 800 * Only whack the UART when params change. 801 * Some callers need to clear tp->t_ospeed 802 * to make sure initialization gets done. 803 */ 804 if (tp->t_ospeed == bps && 805 tp->t_cflag == cflag) 806 return (0); 807 808 /* 809 * Call MD functions to deal with changed 810 * clock modes or H/W flow control modes. 811 * The BRG divisor is set now. (reg 12,13) 812 */ 813 error = zs_set_speed(cs, bps); 814 if (error) 815 return (error); 816 error = zs_set_modes(cs, cflag); 817 if (error) 818 return (error); 819 cs->cs_rr0_mask = cs->cs_rr0_cts | cs->cs_rr0_dcd; 820 821 /* OK, we are now committed to do it. */ 822 tp->t_cflag = cflag; 823 tp->t_ospeed = bps; 824 tp->t_ispeed = bps; 825 826 /* 827 * Block interrupts so that state will not 828 * be altered until we are done setting it up. 829 * 830 * Initial values in cs_preg are set before 831 * our attach routine is called. The master 832 * interrupt enable is handled by zsc.c 833 * 834 */ 835 s = splzs(); 836 837 /* Recompute character size bits. */ 838 tmp3 = cs->cs_preg[3] & ~ZSWR3_RXSIZE; 839 tmp5 = cs->cs_preg[5] & ~ZSWR5_TXSIZE; 840 switch (cflag & CSIZE) { 841 case CS5: 842 /* These are |= 0 but let the optimizer deal with it. */ 843 tmp3 |= ZSWR3_RX_5; 844 tmp5 |= ZSWR5_TX_5; 845 break; 846 case CS6: 847 tmp3 |= ZSWR3_RX_6; 848 tmp5 |= ZSWR5_TX_6; 849 break; 850 case CS7: 851 tmp3 |= ZSWR3_RX_7; 852 tmp5 |= ZSWR5_TX_7; 853 break; 854 case CS8: 855 default: 856 tmp3 |= ZSWR3_RX_8; 857 tmp5 |= ZSWR5_TX_8; 858 break; 859 } 860 861#if 0 862 /* Raise or lower DTR and RTS as appropriate. */ 863 if (bps) { 864 /* Raise DTR and RTS */ 865 tmp5 |= cs->cs_wr5_dtr; 866 } else { 867 /* Drop DTR and RTS */ 868 /* XXX: Should SOFTCAR prevent this? */ 869 tmp5 &= ~cs->cs_wr5_dtr; 870 } 871#endif 872 873 cs->cs_preg[3] = tmp3; 874 cs->cs_preg[5] = tmp5; 875 876 /* 877 * Recompute the stop bits and parity bits. Note that 878 * zs_set_speed() may have set clock selection bits etc. 879 * in wr4, so those must preserved. 880 */ 881 tmp4 = cs->cs_preg[4]; 882 /* Recompute stop bits. */ 883 tmp4 &= ~ZSWR4_SBMASK; 884 tmp4 |= (cflag & CSTOPB) ? 885 ZSWR4_TWOSB : ZSWR4_ONESB; 886 /* Recompute parity bits. */ 887 tmp4 &= ~ZSWR4_PARMASK; 888 if ((cflag & PARODD) == 0) 889 tmp4 |= ZSWR4_EVENP; 890 if (cflag & PARENB) 891 tmp4 |= ZSWR4_PARENB; 892 cs->cs_preg[4] = tmp4; 893 894 /* The MD function zs_set_modes handled CRTSCTS, etc. */ 895 896 /* 897 * If nothing is being transmitted, set up new current values, 898 * else mark them as pending. 899 */ 900 if (!cs->cs_heldchange) { 901 if (zst->zst_tx_busy) { 902 zst->zst_heldtbc = zst->zst_tbc; 903 zst->zst_tbc = 0; 904 cs->cs_heldchange = 1; 905 } else 906 zs_loadchannelregs(cs); 907 } 908 909 splx(s); 910 911 /* 912 * Update the tty layer's idea of the carrier bit, in case we changed 913 * CLOCAL or MDMBUF. We don't hang up here; we only do that if we 914 * lose carrier while carrier detection is on. 915 */ 916 (void) (*line->l_modem)(tp, (cs->cs_rr0 & cs->cs_rr0_dcd) != 0); 917 918 /* If we can throttle input, enable "high water" detection. */ 919 if (cflag & CHWFLOW) { 920 zst->zst_rbhiwat = zstty_rbuf_hiwat; 921 } else { 922 /* This impossible value prevents a "high water" trigger. */ 923 zst->zst_rbhiwat = zstty_rbuf_size; 924 /* XXX: Lost hwi ability, so unblock and restart. */ 925 zst->zst_rx_blocked = 0; 926 if (zst->zst_tx_stopped) { 927 zst->zst_tx_stopped = 0; 928 zsstart(tp); 929 } 930 } 931 932 return (0); 933} 934 935/* 936 * Raise or lower modem control (DTR/RTS) signals. If a character is 937 * in transmission, the change is deferred. 938 */ 939static void 940zs_modem(zst, onoff) 941 struct zstty_softc *zst; 942 int onoff; 943{ 944 struct zs_chanstate *cs; 945 int s; 946 947 cs = zst->zst_cs; 948 if (cs->cs_wr5_dtr == 0) 949 return; 950 951 s = splzs(); 952 if (onoff) 953 cs->cs_preg[5] |= cs->cs_wr5_dtr; 954 else 955 cs->cs_preg[5] &= ~cs->cs_wr5_dtr; 956 957 if (!cs->cs_heldchange) { 958 if (zst->zst_tx_busy) { 959 zst->zst_heldtbc = zst->zst_tbc; 960 zst->zst_tbc = 0; 961 cs->cs_heldchange = 1; 962 } else 963 zs_loadchannelregs(cs); 964 } 965 splx(s); 966} 967 968/* 969 * Try to block or unblock input using hardware flow-control. 970 * This is called by kern/tty.c if MDMBUF|CRTSCTS is set, and 971 * if this function returns non-zero, the TS_TBLOCK flag will 972 * be set or cleared according to the "block" arg passed. 973 */ 974int 975zshwiflow(tp, block) 976 struct tty *tp; 977 int block; 978{ 979 register struct zstty_softc *zst; 980 register struct zs_chanstate *cs; 981 int s; 982 983 zst = zstty_cd.cd_devs[minor(tp->t_dev)]; 984 cs = zst->zst_cs; 985 if (cs->cs_wr5_rts == 0) 986 return (0); 987 988 s = splzs(); 989 if (block) { 990 if (!zst->zst_rx_blocked) { 991 zst->zst_rx_blocked = 1; 992 zs_hwiflow(zst); 993 } 994 } else { 995 if (zst->zst_rx_blocked) { 996 zst->zst_rx_blocked = 0; 997 zs_hwiflow(zst); 998 } 999 } 1000 splx(s); 1001 return 1; 1002} 1003 1004/* 1005 * Internal version of zshwiflow 1006 * called at splzs 1007 */ 1008static void 1009zs_hwiflow(zst) 1010 register struct zstty_softc *zst; 1011{ 1012 register struct zs_chanstate *cs; 1013 1014 cs = zst->zst_cs; 1015 if (cs->cs_wr5_rts == 0) 1016 return; 1017 1018 if (zst->zst_rx_blocked) { 1019 cs->cs_preg[5] &= ~cs->cs_wr5_rts; 1020 cs->cs_creg[5] &= ~cs->cs_wr5_rts; 1021 } else { 1022 cs->cs_preg[5] |= cs->cs_wr5_rts; 1023 cs->cs_creg[5] |= cs->cs_wr5_rts; 1024 } 1025 zs_write_reg(cs, 5, cs->cs_creg[5]); 1026} 1027 1028 1029/**************************************************************** 1030 * Interface to the lower layer (zscc) 1031 ****************************************************************/ 1032 1033static void zstty_rxint __P((struct zs_chanstate *)); 1034static void zstty_txint __P((struct zs_chanstate *)); 1035static void zstty_stint __P((struct zs_chanstate *)); 1036static void zstty_softint __P((struct zs_chanstate *)); 1037 1038static void zsoverrun __P((struct zstty_softc *, long *, char *)); 1039 1040/* 1041 * receiver ready interrupt. 1042 * called at splzs 1043 */ 1044static void 1045zstty_rxint(cs) 1046 register struct zs_chanstate *cs; 1047{ 1048 register struct zstty_softc *zst; 1049 register int cc, put, put_next, ringmask; 1050 register u_char c, rr0, rr1; 1051 register u_short ch_rr1; 1052 1053 zst = cs->cs_private; 1054 put = zst->zst_rbput; 1055 ringmask = zst->zst_ringmask; 1056 1057nextchar: 1058 1059 /* 1060 * First read the status, because reading the received char 1061 * destroys the status of this char. 1062 */ 1063 rr1 = zs_read_reg(cs, 1); 1064 c = zs_read_data(cs); 1065 ch_rr1 = (c << 8) | rr1; 1066 1067 if (ch_rr1 & (ZSRR1_FE | ZSRR1_DO | ZSRR1_PE)) { 1068 /* Clear the receive error. */ 1069 zs_write_csr(cs, ZSWR0_RESET_ERRORS); 1070 } 1071 1072 /* XXX: Check for the stop character? */ 1073 1074 zst->zst_rbuf[put] = ch_rr1; 1075 put_next = (put + 1) & ringmask; 1076 1077 /* Would overrun if increment makes (put==get). */ 1078 if (put_next == zst->zst_rbget) { 1079 zst->zst_rx_overrun = 1; 1080 } else { 1081 /* OK, really increment. */ 1082 put = put_next; 1083 } 1084 1085 /* Keep reading until the FIFO is empty. */ 1086 rr0 = zs_read_csr(cs); 1087 if (rr0 & ZSRR0_RX_READY) 1088 goto nextchar; 1089 1090 /* Done reading. */ 1091 zst->zst_rbput = put; 1092 1093 /* 1094 * If ring is getting too full, try to block input. 1095 */ 1096 cc = put - zst->zst_rbget; 1097 if (cc < 0) 1098 cc += zstty_rbuf_size; 1099 if ((cc > zst->zst_rbhiwat) && (zst->zst_rx_blocked == 0)) { 1100 zst->zst_rx_blocked = 1; 1101 zs_hwiflow(zst); 1102 } 1103 1104 /* Ask for softint() call. */ 1105 cs->cs_softreq = 1; 1106} 1107 1108/* 1109 * transmitter ready interrupt. (splzs) 1110 */ 1111static void 1112zstty_txint(cs) 1113 register struct zs_chanstate *cs; 1114{ 1115 register struct zstty_softc *zst; 1116 register int count; 1117 1118 zst = cs->cs_private; 1119 1120 /* 1121 * If we suspended output for a "held" change, 1122 * then handle that now and resume. 1123 * Do flow-control changes ASAP. 1124 * When the only change is for flow control, 1125 * avoid hitting other registers, because that 1126 * often makes the stupid zs drop input... 1127 */ 1128 if (cs->cs_heldchange) { 1129 zs_loadchannelregs(cs); 1130 cs->cs_heldchange = 0; 1131 count = zst->zst_heldtbc; 1132 } else 1133 count = zst->zst_tbc; 1134 1135 /* 1136 * If our transmit buffer still has data, 1137 * just send the next character. 1138 */ 1139 if (count > 0) { 1140 /* Send the next char. */ 1141 zst->zst_tbc = --count; 1142 zs_write_data(cs, *zst->zst_tba); 1143 zst->zst_tba++; 1144 return; 1145 } 1146 1147 zs_write_csr(cs, ZSWR0_RESET_TXINT); 1148 1149 /* Ask the softint routine for more output. */ 1150 zst->zst_tx_busy = 0; 1151 zst->zst_tx_done = 1; 1152 cs->cs_softreq = 1; 1153} 1154 1155/* 1156 * status change interrupt. (splzs) 1157 */ 1158static void 1159zstty_stint(cs) 1160 register struct zs_chanstate *cs; 1161{ 1162 register struct zstty_softc *zst; 1163 register u_char rr0, delta; 1164 1165 zst = cs->cs_private; 1166 1167 rr0 = zs_read_csr(cs); 1168 zs_write_csr(cs, ZSWR0_RESET_STATUS); 1169 1170 /* 1171 * Check here for console break, so that we can abort 1172 * even when interrupts are locking up the machine. 1173 */ 1174 if ((rr0 & ZSRR0_BREAK) && 1175 (zst->zst_hwflags & ZS_HWFLAG_CONSOLE)) 1176 { 1177 zs_abort(cs); 1178 return; 1179 } 1180 1181 delta = rr0 ^ cs->cs_rr0; 1182 cs->cs_rr0 = rr0; 1183 if ((delta & cs->cs_rr0_mask) != 0) { 1184 cs->cs_rr0_delta |= delta; 1185 1186 /* 1187 * Stop output immediately if we lose the output 1188 * flow control signal or carrier detect. 1189 */ 1190 if ((~rr0 & cs->cs_rr0_mask) != 0) { 1191 zst->zst_tbc = 0; 1192 zst->zst_heldtbc = 0; 1193 } 1194 1195 zst->zst_st_check = 1; 1196 } 1197 1198 /* Ask for softint() call. */ 1199 cs->cs_softreq = 1; 1200} 1201 1202/* 1203 * Print out a ring or fifo overrun error message. 1204 */ 1205static void 1206zsoverrun(zst, ptime, what) 1207 struct zstty_softc *zst; 1208 long *ptime; 1209 char *what; 1210{ 1211 1212 if (*ptime != time.tv_sec) { 1213 *ptime = time.tv_sec; 1214 log(LOG_WARNING, "%s: %s overrun\n", 1215 zst->zst_dev.dv_xname, what); 1216 } 1217} 1218 1219/* 1220 * Software interrupt. Called at zssoft 1221 * 1222 * The main job to be done here is to empty the input ring 1223 * by passing its contents up to the tty layer. The ring is 1224 * always emptied during this operation, therefore the ring 1225 * must not be larger than the space after "high water" in 1226 * the tty layer, or the tty layer might drop our input. 1227 * 1228 * Note: an "input blockage" condition is assumed to exist if 1229 * EITHER the TS_TBLOCK flag or zst_rx_blocked flag is set. 1230 */ 1231static void 1232zstty_softint(cs) 1233 struct zs_chanstate *cs; 1234{ 1235 register struct zstty_softc *zst; 1236 register struct tty *tp; 1237 register struct linesw *line; 1238 register int get, c, s, t; 1239 int ringmask, overrun; 1240 register u_short ring_data; 1241 register u_char rr0, delta; 1242 1243 zst = cs->cs_private; 1244 tp = zst->zst_tty; 1245 line = &linesw[tp->t_line]; 1246 ringmask = zst->zst_ringmask; 1247 overrun = 0; 1248 1249 /* 1250 * Raise to tty priority while servicing the ring. 1251 */ 1252 s = spltty(); 1253 1254 if (zst->zst_rx_overrun) { 1255 zst->zst_rx_overrun = 0; 1256 zsoverrun(zst, &zst->zst_rotime, "ring"); 1257 } 1258 1259 /* 1260 * Copy data from the receive ring into the tty layer. 1261 */ 1262 get = zst->zst_rbget; 1263 while (get != zst->zst_rbput) { 1264 ring_data = zst->zst_rbuf[get]; 1265 get = (get + 1) & ringmask; 1266 1267 if (ring_data & ZSRR1_DO) 1268 overrun++; 1269 /* low byte of ring_data is rr1 */ 1270 c = (ring_data >> 8) & 0xff; 1271 if (ring_data & ZSRR1_FE) 1272 c |= TTY_FE; 1273 if (ring_data & ZSRR1_PE) 1274 c |= TTY_PE; 1275 1276 (*line->l_rint)(c, tp); 1277 } 1278 zst->zst_rbget = get; 1279 1280 /* 1281 * If the overrun flag is set now, it was set while 1282 * copying char/status pairs from the ring, which 1283 * means this was a hardware (fifo) overrun. 1284 */ 1285 if (overrun) { 1286 zsoverrun(zst, &zst->zst_fotime, "fifo"); 1287 } 1288 1289 /* 1290 * We have emptied the input ring. Maybe unblock input. 1291 * Note: an "input blockage" condition is assumed to exist 1292 * when EITHER zst_rx_blocked or the TS_TBLOCK flag is set, 1293 * so unblock here ONLY if TS_TBLOCK has not been set. 1294 */ 1295 if (zst->zst_rx_blocked && ((tp->t_state & TS_TBLOCK) == 0)) { 1296 t = splzs(); 1297 zst->zst_rx_blocked = 0; 1298 zs_hwiflow(zst); 1299 splx(t); 1300 } 1301 1302 /* 1303 * Do any deferred work for status interrupts. 1304 * The rr0 was saved in the h/w interrupt to 1305 * avoid another splzs in here. 1306 */ 1307 if (zst->zst_st_check) { 1308 zst->zst_st_check = 0; 1309 1310 t = splzs(); 1311 rr0 = cs->cs_rr0; 1312 delta = cs->cs_rr0_delta; 1313 cs->cs_rr0_delta = 0; 1314 splx(t); 1315 1316 if ((delta & cs->cs_rr0_dcd) != 0) { 1317 /* 1318 * Inform the tty layer that carrier detect changed. 1319 */ 1320 (void) (*line->l_modem)(tp, (rr0 & cs->cs_rr0_dcd) != 0); 1321 } 1322 1323 if ((delta & cs->cs_rr0_cts) != 0) { 1324 /* Block or unblock output according to flow control. */ 1325 if ((rr0 & cs->cs_rr0_cts) != 0) { 1326 zst->zst_tx_stopped = 0; 1327 (*line->l_start)(tp); 1328 } else { 1329 zst->zst_tx_stopped = 1; 1330 } 1331 } 1332 } 1333 1334 if (zst->zst_tx_done) { 1335 zst->zst_tx_done = 0; 1336 1337 tp->t_state &= ~TS_BUSY; 1338 if (tp->t_state & TS_FLUSH) 1339 tp->t_state &= ~TS_FLUSH; 1340 else 1341 ndflush(&tp->t_outq, 1342 (int)(zst->zst_tba - tp->t_outq.c_cf)); 1343 (*line->l_start)(tp); 1344 } 1345 1346 splx(s); 1347} 1348 1349struct zsops zsops_tty = { 1350 zstty_rxint, /* receive char available */ 1351 zstty_stint, /* external/status */ 1352 zstty_txint, /* xmit buffer empty */ 1353 zstty_softint, /* process software interrupt */ 1354}; 1355 1356