z8530tty.c revision 1.34
1/* $NetBSD: z8530tty.c,v 1.34 1997/11/03 04:34:18 gwr 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, s, 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 s = splzs(); 322 323 /* Turn on interrupts. */ 324 cs->cs_creg[1] = cs->cs_preg[1] = ZSWR1_RIE | ZSWR1_SIE; 325 zs_write_reg(cs, 1, cs->cs_creg[1]); 326 327 /* Fetch the current modem control status, needed later. */ 328 cs->cs_rr0 = zs_read_csr(cs); 329 330 splx(s); 331 332 /* Setup the "new" parameters in t. */ 333 t.c_ispeed = 0; 334 t.c_ospeed = cs->cs_defspeed; 335 t.c_cflag = cs->cs_defcflag; 336 /* Make sure zsparam will see changes. */ 337 tp->t_ospeed = 0; 338 (void) zsparam(tp, &t); 339 /* Make sure DTR is on now. */ 340 zs_modem(zst, 1); 341 } else { 342 /* Not the console; may need reset. */ 343 int reset; 344 reset = (channel == 0) ? 345 ZSWR9_A_RESET : ZSWR9_B_RESET; 346 s = splzs(); 347 zs_write_reg(cs, 9, reset); 348 splx(s); 349 /* Will raise DTR in open. */ 350 zs_modem(zst, 0); 351 } 352} 353 354 355/* 356 * Return pointer to our tty. 357 */ 358struct tty * 359zstty(dev) 360 dev_t dev; 361{ 362 struct zstty_softc *zst; 363 int unit = minor(dev); 364 365#ifdef DIAGNOSTIC 366 if (unit >= zstty_cd.cd_ndevs) 367 panic("zstty"); 368#endif 369 zst = zstty_cd.cd_devs[unit]; 370 return (zst->zst_tty); 371} 372 373 374/* 375 * Open a zs serial (tty) port. 376 */ 377int 378zsopen(dev, flags, mode, p) 379 dev_t dev; 380 int flags; 381 int mode; 382 struct proc *p; 383{ 384 register struct tty *tp; 385 register struct zs_chanstate *cs; 386 struct zstty_softc *zst; 387 int error, s, s2, unit; 388 389 unit = minor(dev); 390 if (unit >= zstty_cd.cd_ndevs) 391 return (ENXIO); 392 zst = zstty_cd.cd_devs[unit]; 393 if (zst == NULL) 394 return (ENXIO); 395 tp = zst->zst_tty; 396 cs = zst->zst_cs; 397 398 /* If KGDB took the line, then tp==NULL */ 399 if (tp == NULL) 400 return (EBUSY); 401 402 if ((tp->t_state & TS_ISOPEN) != 0 && 403 (tp->t_state & TS_XCLUDE) != 0 && 404 p->p_ucred->cr_uid != 0) 405 return (EBUSY); 406 407 s = spltty(); 408 409 if ((tp->t_state & TS_ISOPEN) == 0) { 410 /* First open. */ 411 struct termios t; 412 413 s2 = splzs(); 414 415 /* Turn on interrupts. */ 416 cs->cs_creg[1] = cs->cs_preg[1] = ZSWR1_RIE | ZSWR1_SIE; 417 zs_write_reg(cs, 1, cs->cs_creg[1]); 418 419 /* Fetch the current modem control status, needed later. */ 420 cs->cs_rr0 = zs_read_csr(cs); 421 422 splx(s2); 423 424 /* 425 * Setup the "new" parameters in t. 426 * Can not use tp->t because zsparam 427 * deals only with what has changed. 428 */ 429 t.c_ispeed = 0; 430 t.c_ospeed = cs->cs_defspeed; 431 t.c_cflag = cs->cs_defcflag; 432 if (zst->zst_swflags & TIOCFLAG_CLOCAL) 433 t.c_cflag |= CLOCAL; 434 if (zst->zst_swflags & TIOCFLAG_CRTSCTS) 435 t.c_cflag |= CRTSCTS; 436 if (zst->zst_swflags & TIOCFLAG_MDMBUF) 437 t.c_cflag |= MDMBUF; 438 /* Make sure zsparam will see changes. */ 439 tp->t_ospeed = 0; 440 (void) zsparam(tp, &t); 441 /* 442 * Note: zsparam has done: cflag, ispeed, ospeed 443 * so we just need to do: iflag, oflag, lflag, cc 444 * For "raw" mode, just leave all zeros. 445 */ 446 if ((zst->zst_hwflags & ZS_HWFLAG_RAW) == 0) { 447 tp->t_iflag = TTYDEF_IFLAG; 448 tp->t_oflag = TTYDEF_OFLAG; 449 tp->t_lflag = TTYDEF_LFLAG; 450 } 451 ttychars(tp); 452 ttsetwater(tp); 453 454 /* 455 * Turn on DTR. We must always do this, even if carrier is not 456 * present, because otherwise we'd have to use TIOCSDTR 457 * immediately after setting CLOCAL, which applications do not 458 * expect. We always assert DTR while the device is open 459 * unless explicitly requested to deassert it. 460 */ 461 zs_modem(zst, 1); 462 463 s2 = splzs(); 464 465 /* Clear the input ring, and unblock. */ 466 zst->zst_rbget = zst->zst_rbput; 467 zs_iflush(cs); 468 zst->zst_rx_blocked = 0; 469 zs_hwiflow(zst); 470 471 splx(s2); 472 } 473 error = 0; 474 475 /* If we're doing a blocking open... */ 476 if ((flags & O_NONBLOCK) == 0) 477 /* ...then wait for carrier. */ 478 while ((tp->t_state & TS_CARR_ON) == 0 && 479 (tp->t_cflag & (CLOCAL | MDMBUF)) == 0) { 480 error = ttysleep(tp, &tp->t_rawq, TTIPRI | PCATCH, 481 ttopen, 0); 482 if (error) { 483 /* 484 * If the open was interrupted and nobody 485 * else has the device open, then hang up. 486 */ 487 if ((tp->t_state & TS_ISOPEN) == 0) { 488 zs_modem(zst, 0); 489 tp->t_state &= ~TS_WOPEN; 490 ttwakeup(tp); 491 } 492 break; 493 } 494 tp->t_state |= TS_WOPEN; 495 } 496 497 splx(s); 498 if (error == 0) 499 error = (*linesw[tp->t_line].l_open)(dev, tp); 500 return (error); 501} 502 503/* 504 * Close a zs serial port. 505 */ 506int 507zsclose(dev, flags, mode, p) 508 dev_t dev; 509 int flags; 510 int mode; 511 struct proc *p; 512{ 513 struct zstty_softc *zst; 514 register struct zs_chanstate *cs; 515 register struct tty *tp; 516 int s; 517 518 zst = zstty_cd.cd_devs[minor(dev)]; 519 cs = zst->zst_cs; 520 tp = zst->zst_tty; 521 522 /* XXX This is for cons.c. */ 523 if ((tp->t_state & TS_ISOPEN) == 0) 524 return 0; 525 526 (*linesw[tp->t_line].l_close)(tp, flags); 527 ttyclose(tp); 528 529 s = splzs(); 530 531 /* If we were asserting flow control, then deassert it. */ 532 zst->zst_rx_blocked = 1; 533 zs_hwiflow(zst); 534 535 splx(s); 536 537 /* Clear any break condition set with TIOCSBRK. */ 538 zs_break(cs, 0); 539 540 /* 541 * Hang up if necessary. Wait a bit, so the other side has time to 542 * notice even if we immediately open the port again. 543 */ 544 if ((tp->t_cflag & HUPCL) != 0) { 545 zs_modem(zst, 0); 546 (void) tsleep(cs, TTIPRI, ttclos, hz); 547 } 548 549 s = splzs(); 550 551 /* Turn off interrupts. */ 552 cs->cs_creg[1] = cs->cs_preg[1] = 0; 553 zs_write_reg(cs, 1, cs->cs_creg[1]); 554 555 splx(s); 556 557 return (0); 558} 559 560/* 561 * Read/write zs serial port. 562 */ 563int 564zsread(dev, uio, flags) 565 dev_t dev; 566 struct uio *uio; 567 int flags; 568{ 569 register struct zstty_softc *zst; 570 register struct tty *tp; 571 572 zst = zstty_cd.cd_devs[minor(dev)]; 573 tp = zst->zst_tty; 574 return (linesw[tp->t_line].l_read(tp, uio, flags)); 575} 576 577int 578zswrite(dev, uio, flags) 579 dev_t dev; 580 struct uio *uio; 581 int flags; 582{ 583 register struct zstty_softc *zst; 584 register struct tty *tp; 585 586 zst = zstty_cd.cd_devs[minor(dev)]; 587 tp = zst->zst_tty; 588 return (linesw[tp->t_line].l_write(tp, uio, flags)); 589} 590 591int 592zsioctl(dev, cmd, data, flag, p) 593 dev_t dev; 594 u_long cmd; 595 caddr_t data; 596 int flag; 597 struct proc *p; 598{ 599 register struct zstty_softc *zst; 600 register struct zs_chanstate *cs; 601 register struct tty *tp; 602 register struct linesw *line; 603 register int error; 604 605 zst = zstty_cd.cd_devs[minor(dev)]; 606 cs = zst->zst_cs; 607 tp = zst->zst_tty; 608 line = &linesw[tp->t_line]; 609 610 error = (*line->l_ioctl)(tp, cmd, data, flag, p); 611 if (error >= 0) 612 return (error); 613 614 error = ttioctl(tp, cmd, data, flag, p); 615 if (error >= 0) 616 return (error); 617 618#ifdef ZS_MD_IOCTL 619 error = ZS_MD_IOCTL; 620 if (error >= 0) 621 return (error); 622#endif /* ZS_MD_IOCTL */ 623 624 switch (cmd) { 625 case TIOCSBRK: 626 zs_break(cs, 1); 627 break; 628 629 case TIOCCBRK: 630 zs_break(cs, 0); 631 break; 632 633 case TIOCGFLAGS: 634 *(int *)data = zst->zst_swflags; 635 break; 636 637 case TIOCSFLAGS: 638 error = suser(p->p_ucred, &p->p_acflag); 639 if (error) 640 return (error); 641 zst->zst_swflags = *(int *)data; 642 break; 643 644 case TIOCSDTR: 645 zs_modem(zst, 1); 646 break; 647 648 case TIOCCDTR: 649 zs_modem(zst, 0); 650 break; 651 652 case TIOCMSET: 653 case TIOCMBIS: 654 case TIOCMBIC: 655 case TIOCMGET: 656 default: 657 return (ENOTTY); 658 } 659 return (0); 660} 661 662/* 663 * Start or restart transmission. 664 */ 665static void 666zsstart(tp) 667 register struct tty *tp; 668{ 669 register struct zstty_softc *zst; 670 register struct zs_chanstate *cs; 671 register int s; 672 673 zst = zstty_cd.cd_devs[minor(tp->t_dev)]; 674 cs = zst->zst_cs; 675 676 s = spltty(); 677 if ((tp->t_state & TS_BUSY) != 0) 678 goto out; 679 if ((tp->t_state & (TS_TIMEOUT | TS_TTSTOP)) != 0) 680 goto stopped; 681 682 if (zst->zst_tx_stopped) 683 goto stopped; 684 685 if (tp->t_outq.c_cc <= tp->t_lowat) { 686 if ((tp->t_state & TS_ASLEEP) != 0) { 687 tp->t_state &= ~TS_ASLEEP; 688 wakeup((caddr_t)&tp->t_outq); 689 } 690 selwakeup(&tp->t_wsel); 691 if (tp->t_outq.c_cc == 0) 692 goto stopped; 693 } 694 695 /* Grab the first contiguous region of buffer space. */ 696 { 697 u_char *tba; 698 int tbc; 699 700 tba = tp->t_outq.c_cf; 701 tbc = ndqb(&tp->t_outq, 0); 702 703 (void) splzs(); 704 705 zst->zst_tba = tba; 706 zst->zst_tbc = tbc; 707 } 708 709 tp->t_state |= TS_BUSY; 710 zst->zst_tx_busy = 1; 711 712 /* Enable transmit completion interrupts if necessary. */ 713 if ((cs->cs_preg[1] & ZSWR1_TIE) == 0) { 714 cs->cs_preg[1] |= ZSWR1_TIE; 715 cs->cs_creg[1] = cs->cs_preg[1]; 716 zs_write_reg(cs, 1, cs->cs_creg[1]); 717 } 718 719 /* Output the first character of the contiguous buffer. */ 720 zs_write_data(cs, *zst->zst_tba); 721 zst->zst_tbc--; 722 zst->zst_tba++; 723 splx(s); 724 return; 725 726stopped: 727 /* Disable transmit completion interrupts if necessary. */ 728 if ((cs->cs_preg[1] & ZSWR1_TIE) != 0) { 729 cs->cs_preg[1] &= ~ZSWR1_TIE; 730 cs->cs_creg[1] = cs->cs_preg[1]; 731 zs_write_reg(cs, 1, cs->cs_creg[1]); 732 } 733out: 734 splx(s); 735 return; 736} 737 738/* 739 * Stop output, e.g., for ^S or output flush. 740 */ 741void 742zsstop(tp, flag) 743 struct tty *tp; 744 int flag; 745{ 746 register struct zstty_softc *zst; 747 register struct zs_chanstate *cs; 748 register int s; 749 750 zst = zstty_cd.cd_devs[minor(tp->t_dev)]; 751 cs = zst->zst_cs; 752 753 s = splzs(); 754 if (tp->t_state & TS_BUSY) { 755 /* 756 * Device is transmitting; must stop it. 757 * Also clear _heldtbc to prevent any 758 * flow-control event from resuming. 759 */ 760 zst->zst_tbc = 0; 761 zst->zst_heldtbc = 0; 762 if ((tp->t_state & TS_TTSTOP) == 0) 763 tp->t_state |= TS_FLUSH; 764 } 765 splx(s); 766} 767 768/* 769 * Set ZS tty parameters from termios. 770 * XXX - Should just copy the whole termios after 771 * making sure all the changes could be done. 772 */ 773static int 774zsparam(tp, t) 775 register struct tty *tp; 776 register struct termios *t; 777{ 778 struct zstty_softc *zst; 779 struct zs_chanstate *cs; 780 register struct linesw *line; 781 int s, bps, cflag, error; 782 u_char tmp3, tmp4, tmp5; 783 784 zst = zstty_cd.cd_devs[minor(tp->t_dev)]; 785 cs = zst->zst_cs; 786 line = &linesw[tp->t_line]; 787 bps = t->c_ospeed; 788 cflag = t->c_cflag; 789 790 if (bps < 0 || (t->c_ispeed && t->c_ispeed != bps)) 791 return (EINVAL); 792 793 /* 794 * For the console, always force CLOCAL and !HUPCL, so that the port 795 * is always active. 796 */ 797 if ((zst->zst_swflags & TIOCFLAG_SOFTCAR) != 0 || 798 (zst->zst_hwflags & (ZS_HWFLAG_NO_DCD | ZS_HWFLAG_CONSOLE)) != 0) { 799 cflag |= CLOCAL; 800 cflag &= ~HUPCL; 801 } 802 803 /* 804 * Only whack the UART when params change. 805 * Some callers need to clear tp->t_ospeed 806 * to make sure initialization gets done. 807 */ 808 if (tp->t_ospeed == bps && 809 tp->t_cflag == cflag) 810 return (0); 811 812 /* 813 * Call MD functions to deal with changed 814 * clock modes or H/W flow control modes. 815 * The BRG divisor is set now. (reg 12,13) 816 */ 817 error = zs_set_speed(cs, bps); 818 if (error) 819 return (error); 820 error = zs_set_modes(cs, cflag); 821 if (error) 822 return (error); 823 824 /* OK, we are now committed to do it. */ 825 tp->t_cflag = cflag; 826 tp->t_ospeed = bps; 827 tp->t_ispeed = bps; 828 829 /* 830 * Block interrupts so that state will not 831 * be altered until we are done setting it up. 832 * 833 * Initial values in cs_preg are set before 834 * our attach routine is called. The master 835 * interrupt enable is handled by zsc.c 836 * 837 */ 838 s = splzs(); 839 840 cs->cs_rr0_mask = cs->cs_rr0_cts | cs->cs_rr0_dcd; 841 if ((cs->cs_rr0_mask & ZSRR0_DCD) != 0) 842 cs->cs_preg[15] |= ZSWR15_DCD_IE; 843 else 844 cs->cs_preg[15] &= ~ZSWR15_DCD_IE; 845 if ((cs->cs_rr0_mask & ZSRR0_CTS) != 0) 846 cs->cs_preg[15] |= ZSWR15_CTS_IE; 847 else 848 cs->cs_preg[15] &= ~ZSWR15_CTS_IE; 849 850 /* Recompute character size bits. */ 851 tmp3 = cs->cs_preg[3] & ~ZSWR3_RXSIZE; 852 tmp5 = cs->cs_preg[5] & ~ZSWR5_TXSIZE; 853 switch (cflag & CSIZE) { 854 case CS5: 855 /* These are |= 0 but let the optimizer deal with it. */ 856 tmp3 |= ZSWR3_RX_5; 857 tmp5 |= ZSWR5_TX_5; 858 break; 859 case CS6: 860 tmp3 |= ZSWR3_RX_6; 861 tmp5 |= ZSWR5_TX_6; 862 break; 863 case CS7: 864 tmp3 |= ZSWR3_RX_7; 865 tmp5 |= ZSWR5_TX_7; 866 break; 867 case CS8: 868 default: 869 tmp3 |= ZSWR3_RX_8; 870 tmp5 |= ZSWR5_TX_8; 871 break; 872 } 873 874#if 0 875 /* Raise or lower DTR and RTS as appropriate. */ 876 if (bps) { 877 /* Raise DTR and RTS */ 878 tmp5 |= cs->cs_wr5_dtr; 879 } else { 880 /* Drop DTR and RTS */ 881 /* XXX: Should SOFTCAR prevent this? */ 882 tmp5 &= ~cs->cs_wr5_dtr; 883 } 884#endif 885 886 cs->cs_preg[3] = tmp3; 887 cs->cs_preg[5] = tmp5; 888 889 /* 890 * Recompute the stop bits and parity bits. Note that 891 * zs_set_speed() may have set clock selection bits etc. 892 * in wr4, so those must preserved. 893 */ 894 tmp4 = cs->cs_preg[4]; 895 /* Recompute stop bits. */ 896 tmp4 &= ~ZSWR4_SBMASK; 897 tmp4 |= (cflag & CSTOPB) ? 898 ZSWR4_TWOSB : ZSWR4_ONESB; 899 /* Recompute parity bits. */ 900 tmp4 &= ~ZSWR4_PARMASK; 901 if ((cflag & PARODD) == 0) 902 tmp4 |= ZSWR4_EVENP; 903 if (cflag & PARENB) 904 tmp4 |= ZSWR4_PARENB; 905 cs->cs_preg[4] = tmp4; 906 907 /* The MD function zs_set_modes handled CRTSCTS, etc. */ 908 909 /* 910 * If nothing is being transmitted, set up new current values, 911 * else mark them as pending. 912 */ 913 if (!cs->cs_heldchange) { 914 if (zst->zst_tx_busy) { 915 zst->zst_heldtbc = zst->zst_tbc; 916 zst->zst_tbc = 0; 917 cs->cs_heldchange = 1; 918 } else 919 zs_loadchannelregs(cs); 920 } 921 922 if ((cflag & CHWFLOW) == 0) { 923 /* This impossible value prevents a "high water" trigger. */ 924 zst->zst_rbhiwat = zstty_rbuf_size; 925 if (zst->zst_rx_blocked) { 926 zst->zst_rx_blocked = 0; 927 zs_hwiflow(zst); 928 } 929 } else { 930 zst->zst_rbhiwat = zstty_rbuf_hiwat; 931 } 932 933 splx(s); 934 935 /* 936 * Update the tty layer's idea of the carrier bit, in case we changed 937 * CLOCAL or MDMBUF. We don't hang up here; we only do that by 938 * explicit request. 939 */ 940 (void) (*line->l_modem)(tp, (cs->cs_rr0 & cs->cs_rr0_dcd) != 0); 941 942 if ((cflag & CHWFLOW) == 0) { 943 if (zst->zst_tx_stopped) { 944 zst->zst_tx_stopped = 0; 945 zsstart(tp); 946 } 947 } 948 949 return (0); 950} 951 952/* 953 * Raise or lower modem control (DTR/RTS) signals. If a character is 954 * in transmission, the change is deferred. 955 */ 956static void 957zs_modem(zst, onoff) 958 struct zstty_softc *zst; 959 int onoff; 960{ 961 struct zs_chanstate *cs; 962 int s; 963 964 cs = zst->zst_cs; 965 if (cs->cs_wr5_dtr == 0) 966 return; 967 968 s = splzs(); 969 if (onoff) 970 cs->cs_preg[5] |= cs->cs_wr5_dtr; 971 else 972 cs->cs_preg[5] &= ~cs->cs_wr5_dtr; 973 974 if (!cs->cs_heldchange) { 975 if (zst->zst_tx_busy) { 976 zst->zst_heldtbc = zst->zst_tbc; 977 zst->zst_tbc = 0; 978 cs->cs_heldchange = 1; 979 } else 980 zs_loadchannelregs(cs); 981 } 982 splx(s); 983} 984 985/* 986 * Try to block or unblock input using hardware flow-control. 987 * This is called by kern/tty.c if MDMBUF|CRTSCTS is set, and 988 * if this function returns non-zero, the TS_TBLOCK flag will 989 * be set or cleared according to the "block" arg passed. 990 */ 991int 992zshwiflow(tp, block) 993 struct tty *tp; 994 int block; 995{ 996 register struct zstty_softc *zst; 997 register struct zs_chanstate *cs; 998 int s; 999 1000 zst = zstty_cd.cd_devs[minor(tp->t_dev)]; 1001 cs = zst->zst_cs; 1002 if (cs->cs_wr5_rts == 0) 1003 return (0); 1004 1005 s = splzs(); 1006 if (block) { 1007 if (!zst->zst_rx_blocked) { 1008 zst->zst_rx_blocked = 1; 1009 zs_hwiflow(zst); 1010 } 1011 } else { 1012 if (zst->zst_rx_blocked) { 1013 zst->zst_rx_blocked = 0; 1014 zs_hwiflow(zst); 1015 } 1016 } 1017 splx(s); 1018 return 1; 1019} 1020 1021/* 1022 * Internal version of zshwiflow 1023 * called at splzs 1024 */ 1025static void 1026zs_hwiflow(zst) 1027 register struct zstty_softc *zst; 1028{ 1029 register struct zs_chanstate *cs; 1030 1031 cs = zst->zst_cs; 1032 if (cs->cs_wr5_rts == 0) 1033 return; 1034 1035 if (zst->zst_rx_blocked) { 1036 cs->cs_preg[5] &= ~cs->cs_wr5_rts; 1037 cs->cs_creg[5] &= ~cs->cs_wr5_rts; 1038 } else { 1039 cs->cs_preg[5] |= cs->cs_wr5_rts; 1040 cs->cs_creg[5] |= cs->cs_wr5_rts; 1041 } 1042 zs_write_reg(cs, 5, cs->cs_creg[5]); 1043} 1044 1045 1046/**************************************************************** 1047 * Interface to the lower layer (zscc) 1048 ****************************************************************/ 1049 1050static void zstty_rxint __P((struct zs_chanstate *)); 1051static void zstty_txint __P((struct zs_chanstate *)); 1052static void zstty_stint __P((struct zs_chanstate *)); 1053static void zstty_softint __P((struct zs_chanstate *)); 1054 1055static void zsoverrun __P((struct zstty_softc *, long *, char *)); 1056 1057/* 1058 * receiver ready interrupt. 1059 * called at splzs 1060 */ 1061static void 1062zstty_rxint(cs) 1063 register struct zs_chanstate *cs; 1064{ 1065 register struct zstty_softc *zst; 1066 register int cc, put, put_next, ringmask; 1067 register u_char c, rr0, rr1; 1068 register u_short ch_rr1; 1069 1070 zst = cs->cs_private; 1071 put = zst->zst_rbput; 1072 ringmask = zst->zst_ringmask; 1073 1074nextchar: 1075 1076 /* 1077 * First read the status, because reading the received char 1078 * destroys the status of this char. 1079 */ 1080 rr1 = zs_read_reg(cs, 1); 1081 c = zs_read_data(cs); 1082 ch_rr1 = (c << 8) | rr1; 1083 1084 if (ch_rr1 & (ZSRR1_FE | ZSRR1_DO | ZSRR1_PE)) { 1085 /* Clear the receive error. */ 1086 zs_write_csr(cs, ZSWR0_RESET_ERRORS); 1087 } 1088 1089 /* XXX: Check for the stop character? */ 1090 1091 zst->zst_rbuf[put] = ch_rr1; 1092 put_next = (put + 1) & ringmask; 1093 1094 /* Would overrun if increment makes (put==get). */ 1095 if (put_next == zst->zst_rbget) { 1096 zst->zst_rx_overrun = 1; 1097 } else { 1098 /* OK, really increment. */ 1099 put = put_next; 1100 } 1101 1102 /* Keep reading until the FIFO is empty. */ 1103 rr0 = zs_read_csr(cs); 1104 if (rr0 & ZSRR0_RX_READY) 1105 goto nextchar; 1106 1107 /* Done reading. */ 1108 zst->zst_rbput = put; 1109 1110 /* 1111 * If ring is getting too full, try to block input. 1112 */ 1113 cc = put - zst->zst_rbget; 1114 if (cc < 0) 1115 cc += zstty_rbuf_size; 1116 if ((cc > zst->zst_rbhiwat) && (zst->zst_rx_blocked == 0)) { 1117 zst->zst_rx_blocked = 1; 1118 zs_hwiflow(zst); 1119 } 1120 1121 /* Ask for softint() call. */ 1122 cs->cs_softreq = 1; 1123} 1124 1125/* 1126 * transmitter ready interrupt. (splzs) 1127 */ 1128static void 1129zstty_txint(cs) 1130 register struct zs_chanstate *cs; 1131{ 1132 register struct zstty_softc *zst; 1133 register int count; 1134 1135 zst = cs->cs_private; 1136 1137 /* 1138 * If we suspended output for a "held" change, 1139 * then handle that now and resume. 1140 * Do flow-control changes ASAP. 1141 * When the only change is for flow control, 1142 * avoid hitting other registers, because that 1143 * often makes the stupid zs drop input... 1144 */ 1145 if (cs->cs_heldchange) { 1146 zs_loadchannelregs(cs); 1147 cs->cs_heldchange = 0; 1148 count = zst->zst_heldtbc; 1149 } else 1150 count = zst->zst_tbc; 1151 1152 /* 1153 * If our transmit buffer still has data, 1154 * just send the next character. 1155 */ 1156 if (count > 0) { 1157 /* Send the next char. */ 1158 zst->zst_tbc = --count; 1159 zs_write_data(cs, *zst->zst_tba); 1160 zst->zst_tba++; 1161 return; 1162 } 1163 1164 zs_write_csr(cs, ZSWR0_RESET_TXINT); 1165 1166 /* Ask the softint routine for more output. */ 1167 zst->zst_tx_busy = 0; 1168 zst->zst_tx_done = 1; 1169 cs->cs_softreq = 1; 1170} 1171 1172/* 1173 * status change interrupt. (splzs) 1174 */ 1175static void 1176zstty_stint(cs) 1177 register struct zs_chanstate *cs; 1178{ 1179 register struct zstty_softc *zst; 1180 register u_char rr0, delta; 1181 1182 zst = cs->cs_private; 1183 1184 rr0 = zs_read_csr(cs); 1185 zs_write_csr(cs, ZSWR0_RESET_STATUS); 1186 1187 /* 1188 * Check here for console break, so that we can abort 1189 * even when interrupts are locking up the machine. 1190 */ 1191 if ((rr0 & ZSRR0_BREAK) && 1192 (zst->zst_hwflags & ZS_HWFLAG_CONSOLE)) 1193 { 1194 zs_abort(cs); 1195 return; 1196 } 1197 1198 delta = rr0 ^ cs->cs_rr0; 1199 cs->cs_rr0 = rr0; 1200 if ((delta & cs->cs_rr0_mask) != 0) { 1201 cs->cs_rr0_delta |= delta; 1202 1203 /* 1204 * Stop output immediately if we lose the output 1205 * flow control signal or carrier detect. 1206 */ 1207 if ((~rr0 & cs->cs_rr0_mask) != 0) { 1208 zst->zst_tbc = 0; 1209 zst->zst_heldtbc = 0; 1210 } 1211 1212 zst->zst_st_check = 1; 1213 } 1214 1215 /* Ask for softint() call. */ 1216 cs->cs_softreq = 1; 1217} 1218 1219/* 1220 * Print out a ring or fifo overrun error message. 1221 */ 1222static void 1223zsoverrun(zst, ptime, what) 1224 struct zstty_softc *zst; 1225 long *ptime; 1226 char *what; 1227{ 1228 1229 if (*ptime != time.tv_sec) { 1230 *ptime = time.tv_sec; 1231 log(LOG_WARNING, "%s: %s overrun\n", 1232 zst->zst_dev.dv_xname, what); 1233 } 1234} 1235 1236/* 1237 * Software interrupt. Called at zssoft 1238 * 1239 * The main job to be done here is to empty the input ring 1240 * by passing its contents up to the tty layer. The ring is 1241 * always emptied during this operation, therefore the ring 1242 * must not be larger than the space after "high water" in 1243 * the tty layer, or the tty layer might drop our input. 1244 * 1245 * Note: an "input blockage" condition is assumed to exist if 1246 * EITHER the TS_TBLOCK flag or zst_rx_blocked flag is set. 1247 */ 1248static void 1249zstty_softint(cs) 1250 struct zs_chanstate *cs; 1251{ 1252 register struct zstty_softc *zst; 1253 register struct tty *tp; 1254 register struct linesw *line; 1255 register int get, c, s, t; 1256 int ringmask, overrun; 1257 register u_short ring_data; 1258 register u_char rr0, delta; 1259 1260 zst = cs->cs_private; 1261 tp = zst->zst_tty; 1262 line = &linesw[tp->t_line]; 1263 ringmask = zst->zst_ringmask; 1264 overrun = 0; 1265 1266 /* 1267 * Raise to tty priority while servicing the ring. 1268 */ 1269 s = spltty(); 1270 1271 if (zst->zst_rx_overrun) { 1272 zst->zst_rx_overrun = 0; 1273 zsoverrun(zst, &zst->zst_rotime, "ring"); 1274 } 1275 1276 /* 1277 * Copy data from the receive ring into the tty layer. 1278 */ 1279 get = zst->zst_rbget; 1280 while (get != zst->zst_rbput) { 1281 ring_data = zst->zst_rbuf[get]; 1282 get = (get + 1) & ringmask; 1283 1284 if (ring_data & ZSRR1_DO) 1285 overrun++; 1286 /* low byte of ring_data is rr1 */ 1287 c = (ring_data >> 8) & 0xff; 1288 if (ring_data & ZSRR1_FE) 1289 c |= TTY_FE; 1290 if (ring_data & ZSRR1_PE) 1291 c |= TTY_PE; 1292 1293 (*line->l_rint)(c, tp); 1294 } 1295 zst->zst_rbget = get; 1296 1297 /* 1298 * If the overrun flag is set now, it was set while 1299 * copying char/status pairs from the ring, which 1300 * means this was a hardware (fifo) overrun. 1301 */ 1302 if (overrun) { 1303 zsoverrun(zst, &zst->zst_fotime, "fifo"); 1304 } 1305 1306 /* 1307 * We have emptied the input ring. Maybe unblock input. 1308 * Note: an "input blockage" condition is assumed to exist 1309 * when EITHER zst_rx_blocked or the TS_TBLOCK flag is set, 1310 * so unblock here ONLY if TS_TBLOCK has not been set. 1311 */ 1312 if (zst->zst_rx_blocked && ((tp->t_state & TS_TBLOCK) == 0)) { 1313 t = splzs(); 1314 zst->zst_rx_blocked = 0; 1315 zs_hwiflow(zst); 1316 splx(t); 1317 } 1318 1319 /* 1320 * Do any deferred work for status interrupts. 1321 * The rr0 was saved in the h/w interrupt to 1322 * avoid another splzs in here. 1323 */ 1324 if (zst->zst_st_check) { 1325 zst->zst_st_check = 0; 1326 1327 t = splzs(); 1328 rr0 = cs->cs_rr0; 1329 delta = cs->cs_rr0_delta; 1330 cs->cs_rr0_delta = 0; 1331 splx(t); 1332 1333 if ((delta & cs->cs_rr0_dcd) != 0) { 1334 /* 1335 * Inform the tty layer that carrier detect changed. 1336 */ 1337 (void) (*line->l_modem)(tp, (rr0 & cs->cs_rr0_dcd) != 0); 1338 } 1339 1340 if ((delta & cs->cs_rr0_cts) != 0) { 1341 /* Block or unblock output according to flow control. */ 1342 if ((rr0 & cs->cs_rr0_cts) != 0) { 1343 zst->zst_tx_stopped = 0; 1344 (*line->l_start)(tp); 1345 } else { 1346 zst->zst_tx_stopped = 1; 1347 } 1348 } 1349 } 1350 1351 if (zst->zst_tx_done) { 1352 zst->zst_tx_done = 0; 1353 1354 tp->t_state &= ~TS_BUSY; 1355 if (tp->t_state & TS_FLUSH) 1356 tp->t_state &= ~TS_FLUSH; 1357 else 1358 ndflush(&tp->t_outq, 1359 (int)(zst->zst_tba - tp->t_outq.c_cf)); 1360 (*line->l_start)(tp); 1361 } 1362 1363 splx(s); 1364} 1365 1366struct zsops zsops_tty = { 1367 zstty_rxint, /* receive char available */ 1368 zstty_stint, /* external/status */ 1369 zstty_txint, /* xmit buffer empty */ 1370 zstty_softint, /* process software interrupt */ 1371}; 1372 1373