z8530tty.c revision 1.36
1/* $NetBSD: z8530tty.c,v 1.36 1997/11/03 06:56:28 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 */ 129u_int zstty_rbuf_size = ZSTTY_RING_SIZE; 130 131/* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */ 132u_int zstty_rbuf_hiwat = (ZSTTY_RING_SIZE * 1) / 4; 133u_int zstty_rbuf_lowat = (ZSTTY_RING_SIZE * 3) / 4; 134 135struct zstty_softc { 136 struct device zst_dev; /* required first: base device */ 137 struct tty *zst_tty; 138 struct zs_chanstate *zst_cs; 139 140 u_int zst_overflows, 141 zst_floods, 142 zst_errors; 143 144 int zst_hwflags, /* see z8530var.h */ 145 zst_swflags; /* TIOCFLAG_SOFTCAR, ... <ttycom.h> */ 146 147 u_int zst_r_hiwat, 148 zst_r_lowat; 149 u_char *volatile zst_rbget, 150 *volatile zst_rbput; 151 volatile u_int zst_rbavail; 152 u_char *zst_rbuf, 153 *zst_ebuf; 154 155 /* 156 * The transmit byte count and address are used for pseudo-DMA 157 * output in the hardware interrupt code. PDMA can be suspended 158 * to get pending changes done; heldtbc is used for this. It can 159 * also be stopped for ^S; this sets TS_TTSTOP in tp->t_state. 160 */ 161 u_char *zst_tba; /* transmit buffer address */ 162 u_int zst_tbc, /* transmit byte count */ 163 zst_heldtbc; /* held tbc while xmission stopped */ 164 165 /* Flags to communicate with zstty_softint() */ 166 volatile u_char zst_rx_flags, /* receiver blocked */ 167#define RX_TTY_BLOCKED 0x01 168#define RX_TTY_OVERFLOWED 0x02 169#define RX_IBUF_BLOCKED 0x04 170#define RX_IBUF_OVERFLOWED 0x08 171#define RX_ANY_BLOCK 0x0f 172 zst_tx_busy, /* working on an output chunk */ 173 zst_tx_done, /* done with one output chunk */ 174 zst_tx_stopped, /* H/W level stop (lost CTS) */ 175 zst_st_check, /* got a status interrupt */ 176 zst_rx_ready; 177}; 178 179/* Macros to clear/set/test flags. */ 180#define SET(t, f) (t) |= (f) 181#define CLR(t, f) (t) &= ~(f) 182#define ISSET(t, f) ((t) & (f)) 183 184/* Definition of the driver for autoconfig. */ 185#ifdef __BROKEN_INDIRECT_CONFIG 186static int zstty_match(struct device *, void *, void *); 187#else 188static int zstty_match(struct device *, struct cfdata *, void *); 189#endif 190static void zstty_attach(struct device *, struct device *, void *); 191 192struct cfattach zstty_ca = { 193 sizeof(struct zstty_softc), zstty_match, zstty_attach 194}; 195 196struct cfdriver zstty_cd = { 197 NULL, "zstty", DV_TTY 198}; 199 200struct zsops zsops_tty; 201 202/* Routines called from other code. */ 203cdev_decl(zs); /* open, close, read, write, ioctl, stop, ... */ 204 205static void zsstart __P((struct tty *)); 206static int zsparam __P((struct tty *, struct termios *)); 207static void zs_modem __P((struct zstty_softc *zst, int onoff)); 208static int zshwiflow __P((struct tty *, int)); 209static void zs_hwiflow __P((struct zstty_softc *)); 210 211/* 212 * zstty_match: how is this zs channel configured? 213 */ 214#ifdef __BROKEN_INDIRECT_CONFIG 215int 216zstty_match(parent, vcf, aux) 217 struct device *parent; 218 void *vcf, *aux; 219{ 220 struct cfdata *cf = vcf; 221 struct zsc_attach_args *args = aux; 222 223 /* Exact match is better than wildcard. */ 224 if (cf->cf_loc[ZSCCF_CHANNEL] == args->channel) 225 return 2; 226 227 /* This driver accepts wildcard. */ 228 if (cf->cf_loc[ZSCCF_CHANNEL] == ZSCCF_CHANNEL_DEFAULT) 229 return 1; 230 231 return 0; 232} 233#else /* __BROKEN_INDIRECT_CONFIG */ 234int 235zstty_match(parent, cf, aux) 236 struct device *parent; 237 struct cfdata *cf; 238 void *aux; 239{ 240 struct zsc_attach_args *args = aux; 241 242 /* Exact match is better than wildcard. */ 243 if (cf->cf_loc[ZSCCF_CHANNEL] == args->channel) 244 return 2; 245 246 /* This driver accepts wildcard. */ 247 if (cf->cf_loc[ZSCCF_CHANNEL] == ZSCCF_CHANNEL_DEFAULT) 248 return 1; 249 250 return 0; 251} 252#endif /* __BROKEN_INDIRECT_CONFIG */ 253 254void 255zstty_attach(parent, self, aux) 256 struct device *parent, *self; 257 void *aux; 258 259{ 260 struct zsc_softc *zsc = (void *) parent; 261 struct zstty_softc *zst = (void *) self; 262 struct cfdata *cf = self->dv_cfdata; 263 struct zsc_attach_args *args = aux; 264 struct zs_chanstate *cs; 265 struct tty *tp; 266 int channel, s, tty_unit; 267 dev_t dev; 268 269 tty_unit = zst->zst_dev.dv_unit; 270 channel = args->channel; 271 cs = zsc->zsc_cs[channel]; 272 cs->cs_private = zst; 273 cs->cs_ops = &zsops_tty; 274 275 zst->zst_cs = cs; 276 zst->zst_swflags = cf->cf_flags; /* softcar, etc. */ 277 zst->zst_hwflags = args->hwflags; 278 dev = makedev(zs_major, tty_unit); 279 280 if (zst->zst_swflags) 281 printf(" flags 0x%x", zst->zst_swflags); 282 283 if (ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) 284 printf(" (console)"); 285 else { 286#ifdef KGDB 287 /* 288 * Allow kgdb to "take over" this port. Returns true 289 * if this serial port is in-use by kgdb. 290 */ 291 if (zs_check_kgdb(cs, dev)) { 292 printf(" (kgdb)\n"); 293 /* 294 * This is the kgdb port (exclusive use) 295 * so skip the normal attach code. 296 */ 297 return; 298 } 299#endif 300 } 301 printf("\n"); 302 303 tp = ttymalloc(); 304 tp->t_oproc = zsstart; 305 tp->t_param = zsparam; 306 tp->t_hwiflow = zshwiflow; 307 tty_attach(tp); 308 309 zst->zst_tty = tp; 310 zst->zst_rbuf = malloc(zstty_rbuf_size << 1, M_DEVBUF, M_WAITOK); 311 zst->zst_ebuf = zst->zst_rbuf + (zstty_rbuf_size << 1); 312 /* Disable the high water mark. */ 313 zst->zst_r_hiwat = 0; 314 zst->zst_r_lowat = 0; 315 zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf; 316 zst->zst_rbavail = zstty_rbuf_size; 317 318 /* XXX - Do we need an MD hook here? */ 319 320 /* 321 * Hardware init 322 */ 323 if (ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 324 /* Call zsparam similar to open. */ 325 struct termios t; 326 327 s = splzs(); 328 329 /* Turn on interrupts. */ 330 cs->cs_creg[1] = cs->cs_preg[1] = ZSWR1_RIE | ZSWR1_SIE; 331 zs_write_reg(cs, 1, cs->cs_creg[1]); 332 333 /* Fetch the current modem control status, needed later. */ 334 cs->cs_rr0 = zs_read_csr(cs); 335 336 splx(s); 337 338 /* Setup the "new" parameters in t. */ 339 t.c_ispeed = 0; 340 t.c_ospeed = cs->cs_defspeed; 341 t.c_cflag = cs->cs_defcflag; 342 /* Make sure zsparam will see changes. */ 343 tp->t_ospeed = 0; 344 (void) zsparam(tp, &t); 345 346 /* Make sure DTR is on now. */ 347 zs_modem(zst, 1); 348 } else { 349 /* Not the console; may need reset. */ 350 int reset; 351 reset = (channel == 0) ? 352 ZSWR9_A_RESET : ZSWR9_B_RESET; 353 s = splzs(); 354 zs_write_reg(cs, 9, reset); 355 splx(s); 356 357 /* Will raise DTR in open. */ 358 zs_modem(zst, 0); 359 } 360} 361 362 363/* 364 * Return pointer to our tty. 365 */ 366struct tty * 367zstty(dev) 368 dev_t dev; 369{ 370 struct zstty_softc *zst; 371 int unit = minor(dev); 372 373#ifdef DIAGNOSTIC 374 if (unit >= zstty_cd.cd_ndevs) 375 panic("zstty"); 376#endif 377 zst = zstty_cd.cd_devs[unit]; 378 return (zst->zst_tty); 379} 380 381 382/* 383 * Open a zs serial (tty) port. 384 */ 385int 386zsopen(dev, flags, mode, p) 387 dev_t dev; 388 int flags; 389 int mode; 390 struct proc *p; 391{ 392 struct tty *tp; 393 struct zs_chanstate *cs; 394 struct zstty_softc *zst; 395 int error, s, s2, unit; 396 397 unit = minor(dev); 398 if (unit >= zstty_cd.cd_ndevs) 399 return (ENXIO); 400 zst = zstty_cd.cd_devs[unit]; 401 if (zst == NULL) 402 return (ENXIO); 403 tp = zst->zst_tty; 404 cs = zst->zst_cs; 405 406 /* If KGDB took the line, then tp==NULL */ 407 if (tp == NULL) 408 return (EBUSY); 409 410 if (ISSET(tp->t_state, TS_ISOPEN) && 411 ISSET(tp->t_state, TS_XCLUDE) && 412 p->p_ucred->cr_uid != 0) 413 return (EBUSY); 414 415 s = spltty(); 416 417 /* We need to set this early for the benefit of zssoft(). */ 418 SET(tp->t_state, TS_WOPEN); 419 420 /* 421 * Do the following iff this is a first open. 422 */ 423 if (!ISSET(tp->t_state, TS_ISOPEN)) { 424 struct termios t; 425 426 tp->t_dev = dev; 427 428 s2 = splzs(); 429 430 /* Turn on interrupts. */ 431 cs->cs_creg[1] = cs->cs_preg[1] = ZSWR1_RIE | ZSWR1_SIE; 432 zs_write_reg(cs, 1, cs->cs_creg[1]); 433 434 /* Fetch the current modem control status, needed later. */ 435 cs->cs_rr0 = zs_read_csr(cs); 436 437 splx(s2); 438 439 /* 440 * Initialize the termios status to the defaults. Add in the 441 * sticky bits from TIOCSFLAGS. 442 */ 443 t.c_ispeed = 0; 444 t.c_ospeed = cs->cs_defspeed; 445 t.c_cflag = cs->cs_defcflag; 446 if (ISSET(zst->zst_swflags, TIOCFLAG_CLOCAL)) 447 SET(t.c_cflag, CLOCAL); 448 if (ISSET(zst->zst_swflags, TIOCFLAG_CRTSCTS)) 449 SET(t.c_cflag, CRTSCTS); 450 if (ISSET(zst->zst_swflags, TIOCFLAG_MDMBUF)) 451 SET(t.c_cflag, MDMBUF); 452 /* Make sure zsparam will see changes. */ 453 tp->t_ospeed = 0; 454 (void) zsparam(tp, &t); 455 /* 456 * Note: zsparam has done: cflag, ispeed, ospeed 457 * so we just need to do: iflag, oflag, lflag, cc 458 * For "raw" mode, just leave all zeros. 459 */ 460 if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_RAW)) { 461 tp->t_iflag = TTYDEF_IFLAG; 462 tp->t_oflag = TTYDEF_OFLAG; 463 tp->t_lflag = TTYDEF_LFLAG; 464 } else { 465 tp->t_iflag = 0; 466 tp->t_oflag = 0; 467 tp->t_lflag = 0; 468 } 469 ttychars(tp); 470 ttsetwater(tp); 471 472 /* 473 * Turn on DTR. We must always do this, even if carrier is not 474 * present, because otherwise we'd have to use TIOCSDTR 475 * immediately after setting CLOCAL, which applications do not 476 * expect. We always assert DTR while the device is open 477 * unless explicitly requested to deassert it. 478 */ 479 zs_modem(zst, 1); 480 481 s2 = splzs(); 482 483 /* Clear the input ring, and unblock. */ 484 zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf; 485 zst->zst_rbavail = zstty_rbuf_size; 486 zs_iflush(cs); 487 CLR(zst->zst_rx_flags, RX_ANY_BLOCK); 488 zs_hwiflow(zst); 489 490 splx(s2); 491 } 492 error = 0; 493 494 /* If we're doing a blocking open... */ 495 if (!ISSET(flags, O_NONBLOCK)) 496 /* ...then wait for carrier. */ 497 while (!ISSET(tp->t_state, TS_CARR_ON) && 498 !ISSET(tp->t_cflag, CLOCAL | MDMBUF)) { 499 error = ttysleep(tp, &tp->t_rawq, TTIPRI | PCATCH, 500 ttopen, 0); 501 if (error) { 502 /* 503 * If the open was interrupted and nobody 504 * else has the device open, then hang up. 505 */ 506 if (!ISSET(tp->t_state, TS_ISOPEN)) { 507 zs_modem(zst, 0); 508 CLR(tp->t_state, TS_WOPEN); 509 ttwakeup(tp); 510 } 511 break; 512 } 513 SET(tp->t_state, TS_WOPEN); 514 } 515 516 splx(s); 517 if (error == 0) 518 error = (*linesw[tp->t_line].l_open)(dev, tp); 519 return (error); 520} 521 522/* 523 * Close a zs serial port. 524 */ 525int 526zsclose(dev, flags, mode, p) 527 dev_t dev; 528 int flags; 529 int mode; 530 struct proc *p; 531{ 532 struct zstty_softc *zst = zstty_cd.cd_devs[minor(dev)]; 533 struct zs_chanstate *cs = zst->zst_cs; 534 struct tty *tp = zst->zst_tty; 535 int s; 536 537 /* XXX This is for cons.c. */ 538 if (!ISSET(tp->t_state, TS_ISOPEN)) 539 return 0; 540 541 (*linesw[tp->t_line].l_close)(tp, flags); 542 ttyclose(tp); 543 544 s = splzs(); 545 546 /* If we were asserting flow control, then deassert it. */ 547 SET(zst->zst_rx_flags, RX_IBUF_BLOCKED); 548 zs_hwiflow(zst); 549 550 splx(s); 551 552 /* Clear any break condition set with TIOCSBRK. */ 553 zs_break(cs, 0); 554 555 /* 556 * Hang up if necessary. Wait a bit, so the other side has time to 557 * notice even if we immediately open the port again. 558 */ 559 if (ISSET(tp->t_cflag, HUPCL)) { 560 zs_modem(zst, 0); 561 (void) tsleep(cs, TTIPRI, ttclos, hz); 562 } 563 564 s = splzs(); 565 566 /* Turn off interrupts. */ 567#ifdef DDB 568 if (ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) 569 cs->cs_creg[1] = cs->cs_preg[1] = ZSWR1_RIE | ZSWR1_SIE; 570 else 571#endif 572 cs->cs_creg[1] = cs->cs_preg[1] = 0; 573 zs_write_reg(cs, 1, cs->cs_creg[1]); 574 575 splx(s); 576 577 return (0); 578} 579 580/* 581 * Read/write zs serial port. 582 */ 583int 584zsread(dev, uio, flags) 585 dev_t dev; 586 struct uio *uio; 587 int flags; 588{ 589 struct zstty_softc *zst = zstty_cd.cd_devs[minor(dev)]; 590 struct tty *tp = zst->zst_tty; 591 592 return ((*linesw[tp->t_line].l_read)(tp, uio, flags)); 593} 594 595int 596zswrite(dev, uio, flags) 597 dev_t dev; 598 struct uio *uio; 599 int flags; 600{ 601 struct zstty_softc *zst = zstty_cd.cd_devs[minor(dev)]; 602 struct tty *tp = zst->zst_tty; 603 604 return ((*linesw[tp->t_line].l_write)(tp, uio, flags)); 605} 606 607int 608zsioctl(dev, cmd, data, flag, p) 609 dev_t dev; 610 u_long cmd; 611 caddr_t data; 612 int flag; 613 struct proc *p; 614{ 615 struct zstty_softc *zst = zstty_cd.cd_devs[minor(dev)]; 616 struct zs_chanstate *cs = zst->zst_cs; 617 struct tty *tp = zst->zst_tty; 618 int error; 619 620 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); 621 if (error >= 0) 622 return (error); 623 624 error = ttioctl(tp, cmd, data, flag, p); 625 if (error >= 0) 626 return (error); 627 628#ifdef ZS_MD_IOCTL 629 error = ZS_MD_IOCTL; 630 if (error >= 0) 631 return (error); 632#endif /* ZS_MD_IOCTL */ 633 634 switch (cmd) { 635 case TIOCSBRK: 636 zs_break(cs, 1); 637 break; 638 639 case TIOCCBRK: 640 zs_break(cs, 0); 641 break; 642 643 case TIOCGFLAGS: 644 *(int *)data = zst->zst_swflags; 645 break; 646 647 case TIOCSFLAGS: 648 error = suser(p->p_ucred, &p->p_acflag); 649 if (error) 650 return (error); 651 zst->zst_swflags = *(int *)data; 652 break; 653 654 case TIOCSDTR: 655 zs_modem(zst, 1); 656 break; 657 658 case TIOCCDTR: 659 zs_modem(zst, 0); 660 break; 661 662 case TIOCMSET: 663 case TIOCMBIS: 664 case TIOCMBIC: 665 case TIOCMGET: 666 default: 667 return (ENOTTY); 668 } 669 return (0); 670} 671 672/* 673 * Start or restart transmission. 674 */ 675static void 676zsstart(tp) 677 struct tty *tp; 678{ 679 struct zstty_softc *zst = zstty_cd.cd_devs[minor(tp->t_dev)]; 680 struct zs_chanstate *cs = zst->zst_cs; 681 int s; 682 683 s = spltty(); 684 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 685 goto out; 686 if (zst->zst_tx_stopped) 687 goto out; 688 689 if (tp->t_outq.c_cc <= tp->t_lowat) { 690 if (ISSET(tp->t_state, TS_ASLEEP)) { 691 CLR(tp->t_state, TS_ASLEEP); 692 wakeup((caddr_t)&tp->t_outq); 693 } 694 selwakeup(&tp->t_wsel); 695 if (tp->t_outq.c_cc == 0) 696 goto out; 697 } 698 699 /* Grab the first contiguous region of buffer space. */ 700 { 701 u_char *tba; 702 int tbc; 703 704 tba = tp->t_outq.c_cf; 705 tbc = ndqb(&tp->t_outq, 0); 706 707 (void) splzs(); 708 709 zst->zst_tba = tba; 710 zst->zst_tbc = tbc; 711 } 712 713 SET(tp->t_state, TS_BUSY); 714 zst->zst_tx_busy = 1; 715 716 /* Enable transmit completion interrupts if necessary. */ 717 if (!ISSET(cs->cs_preg[1], ZSWR1_TIE)) { 718 SET(cs->cs_preg[1], ZSWR1_TIE); 719 cs->cs_creg[1] = cs->cs_preg[1]; 720 zs_write_reg(cs, 1, cs->cs_creg[1]); 721 } 722 723 /* Output the first character of the contiguous buffer. */ 724 { 725 zs_write_data(cs, *zst->zst_tba); 726 zst->zst_tbc--; 727 zst->zst_tba++; 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 struct zstty_softc *zst = zstty_cd.cd_devs[minor(tp->t_dev)]; 743 int s; 744 745 s = splzs(); 746 if (ISSET(tp->t_state, TS_BUSY)) { 747 /* Stop transmitting at the next chunk. */ 748 zst->zst_tbc = 0; 749 zst->zst_heldtbc = 0; 750 if (!ISSET(tp->t_state, TS_TTSTOP)) 751 SET(tp->t_state, TS_FLUSH); 752 } 753 splx(s); 754} 755 756/* 757 * Set ZS tty parameters from termios. 758 * XXX - Should just copy the whole termios after 759 * making sure all the changes could be done. 760 */ 761static int 762zsparam(tp, t) 763 struct tty *tp; 764 struct termios *t; 765{ 766 struct zstty_softc *zst = zstty_cd.cd_devs[minor(tp->t_dev)]; 767 struct zs_chanstate *cs = zst->zst_cs; 768 int ospeed, cflag; 769 u_char tmp3, tmp4, tmp5, tmp15; 770 int s, error; 771 772 ospeed = t->c_ospeed; 773 cflag = t->c_cflag; 774 775 /* Check requested parameters. */ 776 if (ospeed < 0) 777 return (EINVAL); 778 if (t->c_ispeed && t->c_ispeed != ospeed) 779 return (EINVAL); 780 781 /* 782 * For the console, always force CLOCAL and !HUPCL, so that the port 783 * is always active. 784 */ 785 if (ISSET(zst->zst_swflags, TIOCFLAG_SOFTCAR) || 786 ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 787 SET(cflag, CLOCAL); 788 CLR(cflag, HUPCL); 789 } 790 791 /* 792 * Only whack the UART when params change. 793 * Some callers need to clear tp->t_ospeed 794 * to make sure initialization gets done. 795 */ 796 if (tp->t_ospeed == ospeed && 797 tp->t_cflag == cflag) 798 return (0); 799 800 /* 801 * Call MD functions to deal with changed 802 * clock modes or H/W flow control modes. 803 * The BRG divisor is set now. (reg 12,13) 804 */ 805 error = zs_set_speed(cs, ospeed); 806 if (error) 807 return (error); 808 error = zs_set_modes(cs, cflag); 809 if (error) 810 return (error); 811 812 /* 813 * Block interrupts so that state will not 814 * be altered until we are done setting it up. 815 * 816 * Initial values in cs_preg are set before 817 * our attach routine is called. The master 818 * interrupt enable is handled by zsc.c 819 * 820 */ 821 s = splzs(); 822 823 cs->cs_rr0_mask = cs->cs_rr0_cts | cs->cs_rr0_dcd; 824 tmp15 = cs->cs_preg[15]; 825 if (ISSET(cs->cs_rr0_mask, ZSRR0_DCD)) 826 SET(tmp15, ZSWR15_DCD_IE); 827 else 828 CLR(tmp15, ZSWR15_DCD_IE); 829 if (ISSET(cs->cs_rr0_mask, ZSRR0_CTS)) 830 SET(tmp15, ZSWR15_CTS_IE); 831 else 832 CLR(tmp15, ZSWR15_CTS_IE); 833 cs->cs_preg[15] = tmp15; 834 835 /* Recompute character size bits. */ 836 tmp3 = cs->cs_preg[3]; 837 tmp5 = cs->cs_preg[5]; 838 CLR(tmp3, ZSWR3_RXSIZE); 839 CLR(tmp5, ZSWR5_TXSIZE); 840 switch (ISSET(cflag, CSIZE)) { 841 case CS5: 842 SET(tmp3, ZSWR3_RX_5); 843 SET(tmp5, ZSWR5_TX_5); 844 break; 845 case CS6: 846 SET(tmp3, ZSWR3_RX_6); 847 SET(tmp5, ZSWR5_TX_6); 848 break; 849 case CS7: 850 SET(tmp3, ZSWR3_RX_7); 851 SET(tmp5, ZSWR5_TX_7); 852 break; 853 case CS8: 854 SET(tmp3, ZSWR3_RX_8); 855 SET(tmp5, ZSWR5_TX_8); 856 break; 857 } 858 cs->cs_preg[3] = tmp3; 859 cs->cs_preg[5] = tmp5; 860 861 /* 862 * Recompute the stop bits and parity bits. Note that 863 * zs_set_speed() may have set clock selection bits etc. 864 * in wr4, so those must preserved. 865 */ 866 tmp4 = cs->cs_preg[4]; 867 CLR(tmp4, ZSWR4_SBMASK | ZSWR4_PARMASK); 868 if (ISSET(cflag, CSTOPB)) 869 SET(tmp4, ZSWR4_TWOSB); 870 else 871 SET(tmp4, ZSWR4_ONESB); 872 if (!ISSET(cflag, PARODD)) 873 SET(tmp4, ZSWR4_EVENP); 874 if (ISSET(cflag, PARENB)) 875 SET(tmp4, ZSWR4_PARENB); 876 cs->cs_preg[4] = tmp4; 877 878 /* And copy to tty. */ 879 tp->t_ispeed = 0; 880 tp->t_ospeed = ospeed; 881 tp->t_cflag = cflag; 882 883 /* 884 * If nothing is being transmitted, set up new current values, 885 * else mark them as pending. 886 */ 887 if (!cs->cs_heldchange) { 888 if (zst->zst_tx_busy) { 889 zst->zst_heldtbc = zst->zst_tbc; 890 zst->zst_tbc = 0; 891 cs->cs_heldchange = 1; 892 } else 893 zs_loadchannelregs(cs); 894 } 895 896 if (!ISSET(cflag, CHWFLOW)) { 897 /* Disable the high water mark. */ 898 zst->zst_r_hiwat = 0; 899 zst->zst_r_lowat = 0; 900 if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 901 CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 902 zst->zst_rx_ready = 1; 903 cs->cs_softreq = 1; 904 } 905 if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 906 CLR(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 907 zs_hwiflow(zst); 908 } 909 } else { 910 zst->zst_r_hiwat = zstty_rbuf_hiwat; 911 zst->zst_r_lowat = zstty_rbuf_lowat; 912 } 913 914 splx(s); 915 916 /* 917 * Update the tty layer's idea of the carrier bit, in case we changed 918 * CLOCAL or MDMBUF. We don't hang up here; we only do that by 919 * explicit request. 920 */ 921 (void) (*linesw[tp->t_line].l_modem)(tp, ISSET(cs->cs_rr0, ZSRR0_DCD)); 922 923 if (!ISSET(cflag, CHWFLOW)) { 924 if (zst->zst_tx_stopped) { 925 zst->zst_tx_stopped = 0; 926 zsstart(tp); 927 } 928 } 929 930 return (0); 931} 932 933/* 934 * Raise or lower modem control (DTR/RTS) signals. If a character is 935 * in transmission, the change is deferred. 936 */ 937static void 938zs_modem(zst, onoff) 939 struct zstty_softc *zst; 940 int onoff; 941{ 942 struct zs_chanstate *cs = zst->zst_cs; 943 int s; 944 945 if (cs->cs_wr5_dtr == 0) 946 return; 947 948 s = splzs(); 949 if (onoff) 950 SET(cs->cs_preg[5], cs->cs_wr5_dtr); 951 else 952 CLR(cs->cs_preg[5], cs->cs_wr5_dtr); 953 954 if (!cs->cs_heldchange) { 955 if (zst->zst_tx_busy) { 956 zst->zst_heldtbc = zst->zst_tbc; 957 zst->zst_tbc = 0; 958 cs->cs_heldchange = 1; 959 } else 960 zs_loadchannelregs(cs); 961 } 962 splx(s); 963} 964 965/* 966 * Try to block or unblock input using hardware flow-control. 967 * This is called by kern/tty.c if MDMBUF|CRTSCTS is set, and 968 * if this function returns non-zero, the TS_TBLOCK flag will 969 * be set or cleared according to the "block" arg passed. 970 */ 971int 972zshwiflow(tp, block) 973 struct tty *tp; 974 int block; 975{ 976 struct zstty_softc *zst = zstty_cd.cd_devs[minor(tp->t_dev)]; 977 struct zs_chanstate *cs = zst->zst_cs; 978 int s; 979 980 if (cs->cs_wr5_rts == 0) 981 return (0); 982 983 s = splzs(); 984 if (block) { 985 if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 986 SET(zst->zst_rx_flags, RX_TTY_BLOCKED); 987 zs_hwiflow(zst); 988 } 989 } else { 990 if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 991 CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 992 zst->zst_rx_ready = 1; 993 cs->cs_softreq = 1; 994 } 995 if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 996 CLR(zst->zst_rx_flags, RX_TTY_BLOCKED); 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 struct zstty_softc *zst; 1011{ 1012 struct zs_chanstate *cs = zst->zst_cs; 1013 1014 if (cs->cs_wr5_rts == 0) 1015 return; 1016 1017 if (ISSET(zst->zst_rx_flags, RX_ANY_BLOCK)) { 1018 CLR(cs->cs_preg[5], cs->cs_wr5_rts); 1019 CLR(cs->cs_creg[5], cs->cs_wr5_rts); 1020 } else { 1021 SET(cs->cs_preg[5], cs->cs_wr5_rts); 1022 SET(cs->cs_creg[5], cs->cs_wr5_rts); 1023 } 1024 zs_write_reg(cs, 5, cs->cs_creg[5]); 1025} 1026 1027 1028/**************************************************************** 1029 * Interface to the lower layer (zscc) 1030 ****************************************************************/ 1031 1032static void zstty_rxint __P((struct zs_chanstate *)); 1033static void zstty_txint __P((struct zs_chanstate *)); 1034static void zstty_stint __P((struct zs_chanstate *)); 1035 1036#define integrate static inline 1037static void zstty_softint __P((struct zs_chanstate *)); 1038integrate void zstty_rxsoft __P((struct zstty_softc *, struct tty *)); 1039integrate void zstty_txsoft __P((struct zstty_softc *, struct tty *)); 1040integrate void zstty_stsoft __P((struct zstty_softc *, struct tty *)); 1041static void zstty_diag __P((void *)); 1042 1043/* 1044 * receiver ready interrupt. 1045 * called at splzs 1046 */ 1047static void 1048zstty_rxint(cs) 1049 struct zs_chanstate *cs; 1050{ 1051 struct zstty_softc *zst = cs->cs_private; 1052 u_char *put, *end; 1053 u_int cc; 1054 u_char rr0, rr1, c; 1055 1056 end = zst->zst_ebuf; 1057 put = zst->zst_rbput; 1058 cc = zst->zst_rbavail; 1059 1060 while (cc > 0) { 1061 /* 1062 * First read the status, because reading the received char 1063 * destroys the status of this char. 1064 */ 1065 rr1 = zs_read_reg(cs, 1); 1066 c = zs_read_data(cs); 1067 1068 if (ISSET(rr1, ZSRR1_FE | ZSRR1_DO | ZSRR1_PE)) { 1069 /* Clear the receive error. */ 1070 zs_write_csr(cs, ZSWR0_RESET_ERRORS); 1071 } 1072 1073 put[0] = c; 1074 put[1] = rr1; 1075 put += 2; 1076 if (put >= end) 1077 put = zst->zst_rbuf; 1078 cc--; 1079 1080 rr0 = zs_read_csr(cs); 1081 if (!ISSET(rr0, ZSRR0_RX_READY)) 1082 break; 1083 } 1084 1085 /* 1086 * Current string of incoming characters ended because 1087 * no more data was available or we ran out of space. 1088 * Schedule a receive event if any data was received. 1089 * If we're out of space, turn off receive interrupts. 1090 */ 1091 zst->zst_rbput = put; 1092 zst->zst_rbavail = cc; 1093 if (!ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1094 zst->zst_rx_ready = 1; 1095 cs->cs_softreq = 1; 1096 } 1097 1098 /* 1099 * See if we are in danger of overflowing a buffer. If 1100 * so, use hardware flow control to ease the pressure. 1101 */ 1102 if (!ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED) && 1103 cc < zst->zst_r_hiwat) { 1104 SET(zst->zst_rx_flags, RX_IBUF_BLOCKED); 1105 zs_hwiflow(zst); 1106 } 1107 1108 /* 1109 * If we're out of space, disable receive interrupts 1110 * until the queue has drained a bit. 1111 */ 1112 if (!cc) { 1113 SET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED); 1114 CLR(cs->cs_preg[1], ZSWR1_RIE); 1115 cs->cs_creg[1] = cs->cs_preg[1]; 1116 zs_write_reg(cs, 1, cs->cs_creg[1]); 1117 } 1118 1119#if 0 1120 printf("%xH%04d\n", zst->zst_rx_flags, zst->zst_rbavail); 1121#endif 1122} 1123 1124/* 1125 * transmitter ready interrupt. (splzs) 1126 */ 1127static void 1128zstty_txint(cs) 1129 struct zs_chanstate *cs; 1130{ 1131 struct zstty_softc *zst = cs->cs_private; 1132 1133 /* 1134 * If we've delayed a parameter change, do it now, and restart 1135 * output. 1136 */ 1137 if (cs->cs_heldchange) { 1138 zs_loadchannelregs(cs); 1139 cs->cs_heldchange = 0; 1140 zst->zst_tbc = zst->zst_heldtbc; 1141 zst->zst_heldtbc = 0; 1142 } 1143 1144 /* Output the next character in the buffer, if any. */ 1145 if (zst->zst_tbc > 0) { 1146 zs_write_data(cs, *zst->zst_tba); 1147 zst->zst_tbc--; 1148 zst->zst_tba++; 1149 } else { 1150 /* Disable transmit completion interrupts if necessary. */ 1151 if (ISSET(cs->cs_preg[1], ZSWR1_TIE)) { 1152 CLR(cs->cs_preg[1], ZSWR1_TIE); 1153 cs->cs_creg[1] = cs->cs_preg[1]; 1154 zs_write_reg(cs, 1, cs->cs_creg[1]); 1155 } 1156 if (zst->zst_tx_busy) { 1157 zst->zst_tx_busy = 0; 1158 zst->zst_tx_done = 1; 1159 cs->cs_softreq = 1; 1160 } 1161 } 1162} 1163 1164/* 1165 * status change interrupt. (splzs) 1166 */ 1167static void 1168zstty_stint(cs) 1169 struct zs_chanstate *cs; 1170{ 1171 struct zstty_softc *zst = cs->cs_private; 1172 u_char rr0, delta; 1173 1174 rr0 = zs_read_csr(cs); 1175 zs_write_csr(cs, ZSWR0_RESET_STATUS); 1176 1177 /* 1178 * Check here for console break, so that we can abort 1179 * even when interrupts are locking up the machine. 1180 */ 1181 if (ISSET(rr0, ZSRR0_BREAK) && 1182 ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 1183 zs_abort(cs); 1184 return; 1185 } 1186 1187 delta = rr0 ^ cs->cs_rr0; 1188 cs->cs_rr0 = rr0; 1189 if (ISSET(delta, cs->cs_rr0_mask)) { 1190 SET(cs->cs_rr0_delta, delta); 1191 1192 /* 1193 * Stop output immediately if we lose the output 1194 * flow control signal or carrier detect. 1195 */ 1196 if (ISSET(~rr0, cs->cs_rr0_mask)) { 1197 zst->zst_tbc = 0; 1198 zst->zst_heldtbc = 0; 1199 } 1200 1201 zst->zst_st_check = 1; 1202 cs->cs_softreq = 1; 1203 } 1204} 1205 1206void 1207zstty_diag(arg) 1208 void *arg; 1209{ 1210 struct zstty_softc *zst = arg; 1211 int overflows, floods; 1212 int s; 1213 1214 s = splzs(); 1215 overflows = zst->zst_overflows; 1216 zst->zst_overflows = 0; 1217 floods = zst->zst_floods; 1218 zst->zst_floods = 0; 1219 zst->zst_errors = 0; 1220 splx(s); 1221 1222 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1223 zst->zst_dev.dv_xname, 1224 overflows, overflows == 1 ? "" : "s", 1225 floods, floods == 1 ? "" : "s"); 1226} 1227 1228integrate void 1229zstty_rxsoft(zst, tp) 1230 struct zstty_softc *zst; 1231 struct tty *tp; 1232{ 1233 struct zs_chanstate *cs = zst->zst_cs; 1234 int (*rint) __P((int c, struct tty *tp)) = linesw[tp->t_line].l_rint; 1235 u_char *get, *end; 1236 u_int cc, scc; 1237 u_char rr1; 1238 int code; 1239 int s; 1240 1241 end = zst->zst_ebuf; 1242 get = zst->zst_rbget; 1243 scc = cc = zstty_rbuf_size - zst->zst_rbavail; 1244 1245 if (cc == zstty_rbuf_size) { 1246 zst->zst_floods++; 1247 if (zst->zst_errors++ == 0) 1248 timeout(zstty_diag, zst, 60 * hz); 1249 } 1250 1251 while (cc) { 1252 rr1 = get[1]; 1253 if (ISSET(rr1, ZSRR1_DO)) { 1254 zst->zst_overflows++; 1255 if (zst->zst_errors++ == 0) 1256 timeout(zstty_diag, zst, 60 * hz); 1257 } 1258 code = get[0]; 1259 if (ISSET(rr1, ZSRR1_FE | ZSRR1_PE)) { 1260 if (ISSET(rr1, ZSRR1_FE)) 1261 SET(code, TTY_FE); 1262 if (ISSET(rr1, ZSRR1_PE)) 1263 SET(code, TTY_PE); 1264 } 1265 if ((*rint)(code, tp) == -1) { 1266 /* 1267 * The line discipline's buffer is out of space. 1268 */ 1269 if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1270 /* 1271 * We're either not using flow control, or the 1272 * line discipline didn't tell us to block for 1273 * some reason. Either way, we have no way to 1274 * know when there's more space available, so 1275 * just drop the rest of the data. 1276 */ 1277 get += cc << 1; 1278 if (get >= end) 1279 get -= zstty_rbuf_size << 1; 1280 cc = 0; 1281 } else { 1282 /* 1283 * Don't schedule any more receive processing 1284 * until the line discipline tells us there's 1285 * space available (through comhwiflow()). 1286 * Leave the rest of the data in the input 1287 * buffer. 1288 */ 1289 SET(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1290 } 1291 break; 1292 } 1293 get += 2; 1294 if (get >= end) 1295 get = zst->zst_rbuf; 1296 cc--; 1297 } 1298 1299 if (cc != scc) { 1300 zst->zst_rbget = get; 1301 s = splzs(); 1302 cc = zst->zst_rbavail += scc - cc; 1303 /* Buffers should be ok again, release possible block. */ 1304 if (cc >= zst->zst_r_lowat) { 1305 if (ISSET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED)) { 1306 CLR(zst->zst_rx_flags, RX_IBUF_OVERFLOWED); 1307 SET(cs->cs_preg[1], ZSWR1_RIE); 1308 cs->cs_creg[1] = cs->cs_preg[1]; 1309 zs_write_reg(cs, 1, cs->cs_creg[1]); 1310 } 1311 if (ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED)) { 1312 CLR(zst->zst_rx_flags, RX_IBUF_BLOCKED); 1313 zs_hwiflow(zst); 1314 } 1315 } 1316 splx(s); 1317 } 1318 1319#if 0 1320 printf("%xS%04d\n", zst->zst_rx_flags, zst->zst_rbavail); 1321#endif 1322} 1323 1324integrate void 1325zstty_txsoft(zst, tp) 1326 struct zstty_softc *zst; 1327 struct tty *tp; 1328{ 1329 1330 CLR(tp->t_state, TS_BUSY); 1331 if (ISSET(tp->t_state, TS_FLUSH)) 1332 CLR(tp->t_state, TS_FLUSH); 1333 else 1334 ndflush(&tp->t_outq, (int)(zst->zst_tba - tp->t_outq.c_cf)); 1335 (*linesw[tp->t_line].l_start)(tp); 1336} 1337 1338integrate void 1339zstty_stsoft(zst, tp) 1340 struct zstty_softc *zst; 1341 struct tty *tp; 1342{ 1343 struct zs_chanstate *cs = zst->zst_cs; 1344 u_char rr0, delta; 1345 int s; 1346 1347 s = splzs(); 1348 rr0 = cs->cs_rr0; 1349 delta = cs->cs_rr0_delta; 1350 cs->cs_rr0_delta = 0; 1351 splx(s); 1352 1353 if (ISSET(delta, cs->cs_rr0_dcd)) { 1354 /* 1355 * Inform the tty layer that carrier detect changed. 1356 */ 1357 (void) (*linesw[tp->t_line].l_modem)(tp, ISSET(rr0, ZSRR0_DCD)); 1358 } 1359 1360 if (ISSET(delta, cs->cs_rr0_cts)) { 1361 /* Block or unblock output according to flow control. */ 1362 if (ISSET(rr0, cs->cs_rr0_cts)) { 1363 zst->zst_tx_stopped = 0; 1364 (*linesw[tp->t_line].l_start)(tp); 1365 } else { 1366 zst->zst_tx_stopped = 1; 1367 } 1368 } 1369} 1370 1371/* 1372 * Software interrupt. Called at zssoft 1373 * 1374 * The main job to be done here is to empty the input ring 1375 * by passing its contents up to the tty layer. The ring is 1376 * always emptied during this operation, therefore the ring 1377 * must not be larger than the space after "high water" in 1378 * the tty layer, or the tty layer might drop our input. 1379 * 1380 * Note: an "input blockage" condition is assumed to exist if 1381 * EITHER the TS_TBLOCK flag or zst_rx_blocked flag is set. 1382 */ 1383static void 1384zstty_softint(cs) 1385 struct zs_chanstate *cs; 1386{ 1387 struct zstty_softc *zst = cs->cs_private; 1388 struct tty *tp = zst->zst_tty; 1389 int s; 1390 1391 s = spltty(); 1392 1393 if (zst->zst_rx_ready) { 1394 zst->zst_rx_ready = 0; 1395 zstty_rxsoft(zst, tp); 1396 } 1397 1398 if (zst->zst_st_check) { 1399 zst->zst_st_check = 0; 1400 zstty_stsoft(zst, tp); 1401 } 1402 1403 if (zst->zst_tx_done) { 1404 zst->zst_tx_done = 0; 1405 zstty_txsoft(zst, tp); 1406 } 1407 1408 splx(s); 1409} 1410 1411struct zsops zsops_tty = { 1412 zstty_rxint, /* receive char available */ 1413 zstty_stint, /* external/status */ 1414 zstty_txint, /* xmit buffer empty */ 1415 zstty_softint, /* process software interrupt */ 1416}; 1417