z8530tty.c revision 1.31
1/* $NetBSD: z8530tty.c,v 1.31 1997/11/02 08:50:31 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 /* 452 * Turn on DTR. We must always do this, even if carrier is not 453 * present, because otherwise we'd have to use TIOCSDTR 454 * immediately after setting CLOCAL, which applications do not 455 * expect. We always assert DTR while the device is open 456 * unless explicitly requested to deassert it. 457 */ 458 zs_modem(zst, 1); 459 460 s2 = splzs(); 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); 531 532 splx(s); 533 534 /* Clear any break condition set with TIOCSBRK. */ 535 zs_break(cs, 0); 536 537 /* 538 * Hang up if necessary. Wait a bit, so the other side has time to 539 * notice even if we immediately open the port again. 540 */ 541 if ((tp->t_cflag & HUPCL) != 0) { 542 zs_modem(zst, 0); 543 (void) tsleep(cs, TTIPRI, ttclos, hz); 544 } 545 546 s = splzs(); 547 548 /* Turn off interrupts. */ 549 cs->cs_creg[1] = cs->cs_preg[1] = 0; 550 zs_write_reg(cs, 1, cs->cs_creg[1]); 551 552 splx(s); 553 554 return (0); 555} 556 557/* 558 * Read/write zs serial port. 559 */ 560int 561zsread(dev, uio, flags) 562 dev_t dev; 563 struct uio *uio; 564 int flags; 565{ 566 register struct zstty_softc *zst; 567 register struct tty *tp; 568 569 zst = zstty_cd.cd_devs[minor(dev)]; 570 tp = zst->zst_tty; 571 return (linesw[tp->t_line].l_read(tp, uio, flags)); 572} 573 574int 575zswrite(dev, uio, flags) 576 dev_t dev; 577 struct uio *uio; 578 int flags; 579{ 580 register struct zstty_softc *zst; 581 register struct tty *tp; 582 583 zst = zstty_cd.cd_devs[minor(dev)]; 584 tp = zst->zst_tty; 585 return (linesw[tp->t_line].l_write(tp, uio, flags)); 586} 587 588int 589zsioctl(dev, cmd, data, flag, p) 590 dev_t dev; 591 u_long cmd; 592 caddr_t data; 593 int flag; 594 struct proc *p; 595{ 596 register struct zstty_softc *zst; 597 register struct zs_chanstate *cs; 598 register struct tty *tp; 599 register struct linesw *line; 600 register int error; 601 602 zst = zstty_cd.cd_devs[minor(dev)]; 603 cs = zst->zst_cs; 604 tp = zst->zst_tty; 605 line = &linesw[tp->t_line]; 606 607 error = (*line->l_ioctl)(tp, cmd, data, flag, p); 608 if (error >= 0) 609 return (error); 610 611 error = ttioctl(tp, cmd, data, flag, p); 612 if (error >= 0) 613 return (error); 614 615#ifdef ZS_MD_IOCTL 616 error = ZS_MD_IOCTL; 617 if (error >= 0) 618 return (error); 619#endif /* ZS_MD_IOCTL */ 620 621 switch (cmd) { 622 case TIOCSBRK: 623 zs_break(cs, 1); 624 break; 625 626 case TIOCCBRK: 627 zs_break(cs, 0); 628 break; 629 630 case TIOCGFLAGS: 631 *(int *)data = zst->zst_swflags; 632 break; 633 634 case TIOCSFLAGS: 635 error = suser(p->p_ucred, &p->p_acflag); 636 if (error) 637 return (error); 638 zst->zst_swflags = *(int *)data; 639 break; 640 641 case TIOCSDTR: 642 zs_modem(zst, 1); 643 break; 644 645 case TIOCCDTR: 646 zs_modem(zst, 0); 647 break; 648 649 case TIOCMSET: 650 case TIOCMBIS: 651 case TIOCMBIC: 652 case TIOCMGET: 653 default: 654 return (ENOTTY); 655 } 656 return (0); 657} 658 659/* 660 * Start or restart transmission. 661 */ 662static void 663zsstart(tp) 664 register struct tty *tp; 665{ 666 register struct zstty_softc *zst; 667 register struct zs_chanstate *cs; 668 register int s; 669 670 zst = zstty_cd.cd_devs[minor(tp->t_dev)]; 671 cs = zst->zst_cs; 672 673 s = spltty(); 674 if ((tp->t_state & TS_BUSY) != 0) 675 goto out; 676 if ((tp->t_state & (TS_TIMEOUT | TS_TTSTOP)) != 0) 677 goto stopped; 678 679 if (zst->zst_tx_stopped) 680 goto stopped; 681 682 if (tp->t_outq.c_cc <= tp->t_lowat) { 683 if ((tp->t_state & TS_ASLEEP) != 0) { 684 tp->t_state &= ~TS_ASLEEP; 685 wakeup((caddr_t)&tp->t_outq); 686 } 687 selwakeup(&tp->t_wsel); 688 if (tp->t_outq.c_cc == 0) 689 goto stopped; 690 } 691 692 /* Grab the first contiguous region of buffer space. */ 693 { 694 u_char *tba; 695 int tbc; 696 697 tba = tp->t_outq.c_cf; 698 tbc = ndqb(&tp->t_outq, 0); 699 700 (void) splzs(); 701 702 zst->zst_tba = tba; 703 zst->zst_tbc = tbc; 704 } 705 706 tp->t_state |= TS_BUSY; 707 zst->zst_tx_busy = 1; 708 709 /* Enable transmit completion interrupts if necessary. */ 710 if ((cs->cs_preg[1] & ZSWR1_TIE) == 0) { 711 cs->cs_preg[1] |= ZSWR1_TIE; 712 cs->cs_creg[1] = cs->cs_preg[1]; 713 zs_write_reg(cs, 1, cs->cs_creg[1]); 714 } 715 716 /* Output the first character of the contiguous buffer. */ 717 zs_write_data(cs, *zst->zst_tba); 718 zst->zst_tbc--; 719 zst->zst_tba++; 720 splx(s); 721 return; 722 723stopped: 724 /* Disable transmit completion interrupts if necessary. */ 725 if ((cs->cs_preg[1] & ZSWR1_TIE) != 0) { 726 cs->cs_preg[1] &= ~ZSWR1_TIE; 727 cs->cs_creg[1] = cs->cs_preg[1]; 728 zs_write_reg(cs, 1, cs->cs_creg[1]); 729 } 730out: 731 splx(s); 732 return; 733} 734 735/* 736 * Stop output, e.g., for ^S or output flush. 737 */ 738void 739zsstop(tp, flag) 740 struct tty *tp; 741 int flag; 742{ 743 register struct zstty_softc *zst; 744 register struct zs_chanstate *cs; 745 register int s; 746 747 zst = zstty_cd.cd_devs[minor(tp->t_dev)]; 748 cs = zst->zst_cs; 749 750 s = splzs(); 751 if (tp->t_state & TS_BUSY) { 752 /* 753 * Device is transmitting; must stop it. 754 * Also clear _heldtbc to prevent any 755 * flow-control event from resuming. 756 */ 757 zst->zst_tbc = 0; 758 zst->zst_heldtbc = 0; 759 if ((tp->t_state & TS_TTSTOP) == 0) 760 tp->t_state |= TS_FLUSH; 761 } 762 splx(s); 763} 764 765/* 766 * Set ZS tty parameters from termios. 767 * XXX - Should just copy the whole termios after 768 * making sure all the changes could be done. 769 */ 770static int 771zsparam(tp, t) 772 register struct tty *tp; 773 register struct termios *t; 774{ 775 struct zstty_softc *zst; 776 struct zs_chanstate *cs; 777 register struct linesw *line; 778 int s, bps, cflag, error; 779 u_char tmp3, tmp4, tmp5; 780 781 zst = zstty_cd.cd_devs[minor(tp->t_dev)]; 782 cs = zst->zst_cs; 783 line = &linesw[tp->t_line]; 784 bps = t->c_ospeed; 785 cflag = t->c_cflag; 786 787 if (bps < 0 || (t->c_ispeed && t->c_ispeed != bps)) 788 return (EINVAL); 789 790 /* 791 * For the console, always force CLOCAL and !HUPCL, so that the port 792 * is always active. 793 */ 794 if ((zst->zst_swflags & TIOCFLAG_SOFTCAR) != 0 || 795 (zst->zst_hwflags & (ZS_HWFLAG_NO_DCD | ZS_HWFLAG_CONSOLE)) != 0) { 796 t->c_cflag |= CLOCAL; 797 t->c_cflag &= ~HUPCL; 798 } 799 800 /* 801 * Only whack the UART when params change. 802 * Some callers need to clear tp->t_ospeed 803 * to make sure initialization gets done. 804 */ 805 if (tp->t_ospeed == bps && 806 tp->t_cflag == cflag) 807 return (0); 808 809 /* 810 * Call MD functions to deal with changed 811 * clock modes or H/W flow control modes. 812 * The BRG divisor is set now. (reg 12,13) 813 */ 814 error = zs_set_speed(cs, bps); 815 if (error) 816 return (error); 817 error = zs_set_modes(cs, cflag); 818 if (error) 819 return (error); 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 cs->cs_rr0_mask = cs->cs_rr0_cts | cs->cs_rr0_dcd; 838 if ((cs->cs_rr0_mask & ZSRR0_DCD) != 0) 839 cs->cs_preg[15] |= ZSWR15_DCD_IE; 840 else 841 cs->cs_preg[15] &= ~ZSWR15_DCD_IE; 842 if ((cs->cs_rr0_mask & ZSRR0_CTS) != 0) 843 cs->cs_preg[15] |= ZSWR15_CTS_IE; 844 else 845 cs->cs_preg[15] &= ~ZSWR15_CTS_IE; 846 847 /* Recompute character size bits. */ 848 tmp3 = cs->cs_preg[3] & ~ZSWR3_RXSIZE; 849 tmp5 = cs->cs_preg[5] & ~ZSWR5_TXSIZE; 850 switch (cflag & CSIZE) { 851 case CS5: 852 /* These are |= 0 but let the optimizer deal with it. */ 853 tmp3 |= ZSWR3_RX_5; 854 tmp5 |= ZSWR5_TX_5; 855 break; 856 case CS6: 857 tmp3 |= ZSWR3_RX_6; 858 tmp5 |= ZSWR5_TX_6; 859 break; 860 case CS7: 861 tmp3 |= ZSWR3_RX_7; 862 tmp5 |= ZSWR5_TX_7; 863 break; 864 case CS8: 865 default: 866 tmp3 |= ZSWR3_RX_8; 867 tmp5 |= ZSWR5_TX_8; 868 break; 869 } 870 871#if 0 872 /* Raise or lower DTR and RTS as appropriate. */ 873 if (bps) { 874 /* Raise DTR and RTS */ 875 tmp5 |= cs->cs_wr5_dtr; 876 } else { 877 /* Drop DTR and RTS */ 878 /* XXX: Should SOFTCAR prevent this? */ 879 tmp5 &= ~cs->cs_wr5_dtr; 880 } 881#endif 882 883 cs->cs_preg[3] = tmp3; 884 cs->cs_preg[5] = tmp5; 885 886 /* 887 * Recompute the stop bits and parity bits. Note that 888 * zs_set_speed() may have set clock selection bits etc. 889 * in wr4, so those must preserved. 890 */ 891 tmp4 = cs->cs_preg[4]; 892 /* Recompute stop bits. */ 893 tmp4 &= ~ZSWR4_SBMASK; 894 tmp4 |= (cflag & CSTOPB) ? 895 ZSWR4_TWOSB : ZSWR4_ONESB; 896 /* Recompute parity bits. */ 897 tmp4 &= ~ZSWR4_PARMASK; 898 if ((cflag & PARODD) == 0) 899 tmp4 |= ZSWR4_EVENP; 900 if (cflag & PARENB) 901 tmp4 |= ZSWR4_PARENB; 902 cs->cs_preg[4] = tmp4; 903 904 /* The MD function zs_set_modes handled CRTSCTS, etc. */ 905 906 /* 907 * If nothing is being transmitted, set up new current values, 908 * else mark them as pending. 909 */ 910 if (!cs->cs_heldchange) { 911 if (zst->zst_tx_busy) { 912 zst->zst_heldtbc = zst->zst_tbc; 913 zst->zst_tbc = 0; 914 cs->cs_heldchange = 1; 915 } else 916 zs_loadchannelregs(cs); 917 } 918 919 splx(s); 920 921 /* 922 * Update the tty layer's idea of the carrier bit, in case we changed 923 * CLOCAL or MDMBUF. We don't hang up here; we only do that if we 924 * lose carrier while carrier detection is on. 925 */ 926 (void) (*line->l_modem)(tp, (cs->cs_rr0 & cs->cs_rr0_dcd) != 0); 927 928 /* If we can throttle input, enable "high water" detection. */ 929 if (cflag & CHWFLOW) { 930 zst->zst_rbhiwat = zstty_rbuf_hiwat; 931 } else { 932 /* This impossible value prevents a "high water" trigger. */ 933 zst->zst_rbhiwat = zstty_rbuf_size; 934 if (zst->zst_rx_blocked) { 935 zst->zst_rx_blocked = 0; 936 zs_hwiflow(zst); 937 } 938 if (zst->zst_tx_stopped) { 939 zst->zst_tx_stopped = 0; 940 zsstart(tp); 941 } 942 } 943 944 return (0); 945} 946 947/* 948 * Raise or lower modem control (DTR/RTS) signals. If a character is 949 * in transmission, the change is deferred. 950 */ 951static void 952zs_modem(zst, onoff) 953 struct zstty_softc *zst; 954 int onoff; 955{ 956 struct zs_chanstate *cs; 957 int s; 958 959 cs = zst->zst_cs; 960 if (cs->cs_wr5_dtr == 0) 961 return; 962 963 s = splzs(); 964 if (onoff) 965 cs->cs_preg[5] |= cs->cs_wr5_dtr; 966 else 967 cs->cs_preg[5] &= ~cs->cs_wr5_dtr; 968 969 if (!cs->cs_heldchange) { 970 if (zst->zst_tx_busy) { 971 zst->zst_heldtbc = zst->zst_tbc; 972 zst->zst_tbc = 0; 973 cs->cs_heldchange = 1; 974 } else 975 zs_loadchannelregs(cs); 976 } 977 splx(s); 978} 979 980/* 981 * Try to block or unblock input using hardware flow-control. 982 * This is called by kern/tty.c if MDMBUF|CRTSCTS is set, and 983 * if this function returns non-zero, the TS_TBLOCK flag will 984 * be set or cleared according to the "block" arg passed. 985 */ 986int 987zshwiflow(tp, block) 988 struct tty *tp; 989 int block; 990{ 991 register struct zstty_softc *zst; 992 register struct zs_chanstate *cs; 993 int s; 994 995 zst = zstty_cd.cd_devs[minor(tp->t_dev)]; 996 cs = zst->zst_cs; 997 if (cs->cs_wr5_rts == 0) 998 return (0); 999 1000 s = splzs(); 1001 if (block) { 1002 if (!zst->zst_rx_blocked) { 1003 zst->zst_rx_blocked = 1; 1004 zs_hwiflow(zst); 1005 } 1006 } else { 1007 if (zst->zst_rx_blocked) { 1008 zst->zst_rx_blocked = 0; 1009 zs_hwiflow(zst); 1010 } 1011 } 1012 splx(s); 1013 return 1; 1014} 1015 1016/* 1017 * Internal version of zshwiflow 1018 * called at splzs 1019 */ 1020static void 1021zs_hwiflow(zst) 1022 register struct zstty_softc *zst; 1023{ 1024 register struct zs_chanstate *cs; 1025 1026 cs = zst->zst_cs; 1027 if (cs->cs_wr5_rts == 0) 1028 return; 1029 1030 if (zst->zst_rx_blocked) { 1031 cs->cs_preg[5] &= ~cs->cs_wr5_rts; 1032 cs->cs_creg[5] &= ~cs->cs_wr5_rts; 1033 } else { 1034 cs->cs_preg[5] |= cs->cs_wr5_rts; 1035 cs->cs_creg[5] |= cs->cs_wr5_rts; 1036 } 1037 zs_write_reg(cs, 5, cs->cs_creg[5]); 1038} 1039 1040 1041/**************************************************************** 1042 * Interface to the lower layer (zscc) 1043 ****************************************************************/ 1044 1045static void zstty_rxint __P((struct zs_chanstate *)); 1046static void zstty_txint __P((struct zs_chanstate *)); 1047static void zstty_stint __P((struct zs_chanstate *)); 1048static void zstty_softint __P((struct zs_chanstate *)); 1049 1050static void zsoverrun __P((struct zstty_softc *, long *, char *)); 1051 1052/* 1053 * receiver ready interrupt. 1054 * called at splzs 1055 */ 1056static void 1057zstty_rxint(cs) 1058 register struct zs_chanstate *cs; 1059{ 1060 register struct zstty_softc *zst; 1061 register int cc, put, put_next, ringmask; 1062 register u_char c, rr0, rr1; 1063 register u_short ch_rr1; 1064 1065 zst = cs->cs_private; 1066 put = zst->zst_rbput; 1067 ringmask = zst->zst_ringmask; 1068 1069nextchar: 1070 1071 /* 1072 * First read the status, because reading the received char 1073 * destroys the status of this char. 1074 */ 1075 rr1 = zs_read_reg(cs, 1); 1076 c = zs_read_data(cs); 1077 ch_rr1 = (c << 8) | rr1; 1078 1079 if (ch_rr1 & (ZSRR1_FE | ZSRR1_DO | ZSRR1_PE)) { 1080 /* Clear the receive error. */ 1081 zs_write_csr(cs, ZSWR0_RESET_ERRORS); 1082 } 1083 1084 /* XXX: Check for the stop character? */ 1085 1086 zst->zst_rbuf[put] = ch_rr1; 1087 put_next = (put + 1) & ringmask; 1088 1089 /* Would overrun if increment makes (put==get). */ 1090 if (put_next == zst->zst_rbget) { 1091 zst->zst_rx_overrun = 1; 1092 } else { 1093 /* OK, really increment. */ 1094 put = put_next; 1095 } 1096 1097 /* Keep reading until the FIFO is empty. */ 1098 rr0 = zs_read_csr(cs); 1099 if (rr0 & ZSRR0_RX_READY) 1100 goto nextchar; 1101 1102 /* Done reading. */ 1103 zst->zst_rbput = put; 1104 1105 /* 1106 * If ring is getting too full, try to block input. 1107 */ 1108 cc = put - zst->zst_rbget; 1109 if (cc < 0) 1110 cc += zstty_rbuf_size; 1111 if ((cc > zst->zst_rbhiwat) && (zst->zst_rx_blocked == 0)) { 1112 zst->zst_rx_blocked = 1; 1113 zs_hwiflow(zst); 1114 } 1115 1116 /* Ask for softint() call. */ 1117 cs->cs_softreq = 1; 1118} 1119 1120/* 1121 * transmitter ready interrupt. (splzs) 1122 */ 1123static void 1124zstty_txint(cs) 1125 register struct zs_chanstate *cs; 1126{ 1127 register struct zstty_softc *zst; 1128 register int count; 1129 1130 zst = cs->cs_private; 1131 1132 /* 1133 * If we suspended output for a "held" change, 1134 * then handle that now and resume. 1135 * Do flow-control changes ASAP. 1136 * When the only change is for flow control, 1137 * avoid hitting other registers, because that 1138 * often makes the stupid zs drop input... 1139 */ 1140 if (cs->cs_heldchange) { 1141 zs_loadchannelregs(cs); 1142 cs->cs_heldchange = 0; 1143 count = zst->zst_heldtbc; 1144 } else 1145 count = zst->zst_tbc; 1146 1147 /* 1148 * If our transmit buffer still has data, 1149 * just send the next character. 1150 */ 1151 if (count > 0) { 1152 /* Send the next char. */ 1153 zst->zst_tbc = --count; 1154 zs_write_data(cs, *zst->zst_tba); 1155 zst->zst_tba++; 1156 return; 1157 } 1158 1159 zs_write_csr(cs, ZSWR0_RESET_TXINT); 1160 1161 /* Ask the softint routine for more output. */ 1162 zst->zst_tx_busy = 0; 1163 zst->zst_tx_done = 1; 1164 cs->cs_softreq = 1; 1165} 1166 1167/* 1168 * status change interrupt. (splzs) 1169 */ 1170static void 1171zstty_stint(cs) 1172 register struct zs_chanstate *cs; 1173{ 1174 register struct zstty_softc *zst; 1175 register u_char rr0, delta; 1176 1177 zst = cs->cs_private; 1178 1179 rr0 = zs_read_csr(cs); 1180 zs_write_csr(cs, ZSWR0_RESET_STATUS); 1181 1182 /* 1183 * Check here for console break, so that we can abort 1184 * even when interrupts are locking up the machine. 1185 */ 1186 if ((rr0 & ZSRR0_BREAK) && 1187 (zst->zst_hwflags & ZS_HWFLAG_CONSOLE)) 1188 { 1189 zs_abort(cs); 1190 return; 1191 } 1192 1193 delta = rr0 ^ cs->cs_rr0; 1194 cs->cs_rr0 = rr0; 1195 if ((delta & cs->cs_rr0_mask) != 0) { 1196 cs->cs_rr0_delta |= delta; 1197 1198 /* 1199 * Stop output immediately if we lose the output 1200 * flow control signal or carrier detect. 1201 */ 1202 if ((~rr0 & cs->cs_rr0_mask) != 0) { 1203 zst->zst_tbc = 0; 1204 zst->zst_heldtbc = 0; 1205 } 1206 1207 zst->zst_st_check = 1; 1208 } 1209 1210 /* Ask for softint() call. */ 1211 cs->cs_softreq = 1; 1212} 1213 1214/* 1215 * Print out a ring or fifo overrun error message. 1216 */ 1217static void 1218zsoverrun(zst, ptime, what) 1219 struct zstty_softc *zst; 1220 long *ptime; 1221 char *what; 1222{ 1223 1224 if (*ptime != time.tv_sec) { 1225 *ptime = time.tv_sec; 1226 log(LOG_WARNING, "%s: %s overrun\n", 1227 zst->zst_dev.dv_xname, what); 1228 } 1229} 1230 1231/* 1232 * Software interrupt. Called at zssoft 1233 * 1234 * The main job to be done here is to empty the input ring 1235 * by passing its contents up to the tty layer. The ring is 1236 * always emptied during this operation, therefore the ring 1237 * must not be larger than the space after "high water" in 1238 * the tty layer, or the tty layer might drop our input. 1239 * 1240 * Note: an "input blockage" condition is assumed to exist if 1241 * EITHER the TS_TBLOCK flag or zst_rx_blocked flag is set. 1242 */ 1243static void 1244zstty_softint(cs) 1245 struct zs_chanstate *cs; 1246{ 1247 register struct zstty_softc *zst; 1248 register struct tty *tp; 1249 register struct linesw *line; 1250 register int get, c, s, t; 1251 int ringmask, overrun; 1252 register u_short ring_data; 1253 register u_char rr0, delta; 1254 1255 zst = cs->cs_private; 1256 tp = zst->zst_tty; 1257 line = &linesw[tp->t_line]; 1258 ringmask = zst->zst_ringmask; 1259 overrun = 0; 1260 1261 /* 1262 * Raise to tty priority while servicing the ring. 1263 */ 1264 s = spltty(); 1265 1266 if (zst->zst_rx_overrun) { 1267 zst->zst_rx_overrun = 0; 1268 zsoverrun(zst, &zst->zst_rotime, "ring"); 1269 } 1270 1271 /* 1272 * Copy data from the receive ring into the tty layer. 1273 */ 1274 get = zst->zst_rbget; 1275 while (get != zst->zst_rbput) { 1276 ring_data = zst->zst_rbuf[get]; 1277 get = (get + 1) & ringmask; 1278 1279 if (ring_data & ZSRR1_DO) 1280 overrun++; 1281 /* low byte of ring_data is rr1 */ 1282 c = (ring_data >> 8) & 0xff; 1283 if (ring_data & ZSRR1_FE) 1284 c |= TTY_FE; 1285 if (ring_data & ZSRR1_PE) 1286 c |= TTY_PE; 1287 1288 (*line->l_rint)(c, tp); 1289 } 1290 zst->zst_rbget = get; 1291 1292 /* 1293 * If the overrun flag is set now, it was set while 1294 * copying char/status pairs from the ring, which 1295 * means this was a hardware (fifo) overrun. 1296 */ 1297 if (overrun) { 1298 zsoverrun(zst, &zst->zst_fotime, "fifo"); 1299 } 1300 1301 /* 1302 * We have emptied the input ring. Maybe unblock input. 1303 * Note: an "input blockage" condition is assumed to exist 1304 * when EITHER zst_rx_blocked or the TS_TBLOCK flag is set, 1305 * so unblock here ONLY if TS_TBLOCK has not been set. 1306 */ 1307 if (zst->zst_rx_blocked && ((tp->t_state & TS_TBLOCK) == 0)) { 1308 t = splzs(); 1309 zst->zst_rx_blocked = 0; 1310 zs_hwiflow(zst); 1311 splx(t); 1312 } 1313 1314 /* 1315 * Do any deferred work for status interrupts. 1316 * The rr0 was saved in the h/w interrupt to 1317 * avoid another splzs in here. 1318 */ 1319 if (zst->zst_st_check) { 1320 zst->zst_st_check = 0; 1321 1322 t = splzs(); 1323 rr0 = cs->cs_rr0; 1324 delta = cs->cs_rr0_delta; 1325 cs->cs_rr0_delta = 0; 1326 splx(t); 1327 1328 if ((delta & cs->cs_rr0_dcd) != 0) { 1329 /* 1330 * Inform the tty layer that carrier detect changed. 1331 */ 1332 (void) (*line->l_modem)(tp, (rr0 & cs->cs_rr0_dcd) != 0); 1333 } 1334 1335 if ((delta & cs->cs_rr0_cts) != 0) { 1336 /* Block or unblock output according to flow control. */ 1337 if ((rr0 & cs->cs_rr0_cts) != 0) { 1338 zst->zst_tx_stopped = 0; 1339 (*line->l_start)(tp); 1340 } else { 1341 zst->zst_tx_stopped = 1; 1342 } 1343 } 1344 } 1345 1346 if (zst->zst_tx_done) { 1347 zst->zst_tx_done = 0; 1348 1349 tp->t_state &= ~TS_BUSY; 1350 if (tp->t_state & TS_FLUSH) 1351 tp->t_state &= ~TS_FLUSH; 1352 else 1353 ndflush(&tp->t_outq, 1354 (int)(zst->zst_tba - tp->t_outq.c_cf)); 1355 (*line->l_start)(tp); 1356 } 1357 1358 splx(s); 1359} 1360 1361struct zsops zsops_tty = { 1362 zstty_rxint, /* receive char available */ 1363 zstty_stint, /* external/status */ 1364 zstty_txint, /* xmit buffer empty */ 1365 zstty_softint, /* process software interrupt */ 1366}; 1367 1368