z8530tty.c revision 1.42
1/* $NetBSD: z8530tty.c,v 1.42 1998/01/12 09:23:38 thorpej 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 196extern struct cfdriver zstty_cd; 197 198struct zsops zsops_tty; 199 200/* Routines called from other code. */ 201cdev_decl(zs); /* open, close, read, write, ioctl, stop, ... */ 202 203static void zsstart __P((struct tty *)); 204static int zsparam __P((struct tty *, struct termios *)); 205static void zs_modem __P((struct zstty_softc *zst, int onoff)); 206static int zshwiflow __P((struct tty *, int)); 207static void zs_hwiflow __P((struct zstty_softc *)); 208 209/* 210 * zstty_match: how is this zs channel configured? 211 */ 212#ifdef __BROKEN_INDIRECT_CONFIG 213int 214zstty_match(parent, vcf, aux) 215 struct device *parent; 216 void *vcf, *aux; 217{ 218 struct cfdata *cf = vcf; 219 struct zsc_attach_args *args = aux; 220 221 /* Exact match is better than wildcard. */ 222 if (cf->cf_loc[ZSCCF_CHANNEL] == args->channel) 223 return 2; 224 225 /* This driver accepts wildcard. */ 226 if (cf->cf_loc[ZSCCF_CHANNEL] == ZSCCF_CHANNEL_DEFAULT) 227 return 1; 228 229 return 0; 230} 231#else /* __BROKEN_INDIRECT_CONFIG */ 232int 233zstty_match(parent, cf, aux) 234 struct device *parent; 235 struct cfdata *cf; 236 void *aux; 237{ 238 struct zsc_attach_args *args = aux; 239 240 /* Exact match is better than wildcard. */ 241 if (cf->cf_loc[ZSCCF_CHANNEL] == args->channel) 242 return 2; 243 244 /* This driver accepts wildcard. */ 245 if (cf->cf_loc[ZSCCF_CHANNEL] == ZSCCF_CHANNEL_DEFAULT) 246 return 1; 247 248 return 0; 249} 250#endif /* __BROKEN_INDIRECT_CONFIG */ 251 252void 253zstty_attach(parent, self, aux) 254 struct device *parent, *self; 255 void *aux; 256 257{ 258 struct zsc_softc *zsc = (void *) parent; 259 struct zstty_softc *zst = (void *) self; 260 struct cfdata *cf = self->dv_cfdata; 261 struct zsc_attach_args *args = aux; 262 struct zs_chanstate *cs; 263 struct tty *tp; 264 int channel, s, tty_unit; 265 dev_t dev; 266 267 tty_unit = zst->zst_dev.dv_unit; 268 channel = args->channel; 269 cs = zsc->zsc_cs[channel]; 270 cs->cs_private = zst; 271 cs->cs_ops = &zsops_tty; 272 273 zst->zst_cs = cs; 274 zst->zst_swflags = cf->cf_flags; /* softcar, etc. */ 275 zst->zst_hwflags = args->hwflags; 276 dev = makedev(zs_major, tty_unit); 277 278 if (zst->zst_swflags) 279 printf(" flags 0x%x", zst->zst_swflags); 280 281 if (ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) 282 printf(" (console)"); 283 else { 284#ifdef KGDB 285 /* 286 * Allow kgdb to "take over" this port. Returns true 287 * if this serial port is in-use by kgdb. 288 */ 289 if (zs_check_kgdb(cs, dev)) { 290 printf(" (kgdb)\n"); 291 /* 292 * This is the kgdb port (exclusive use) 293 * so skip the normal attach code. 294 */ 295 return; 296 } 297#endif 298 } 299 printf("\n"); 300 301 tp = ttymalloc(); 302 tp->t_oproc = zsstart; 303 tp->t_param = zsparam; 304 tp->t_hwiflow = zshwiflow; 305 tty_attach(tp); 306 307 zst->zst_tty = tp; 308 zst->zst_rbuf = malloc(zstty_rbuf_size << 1, M_DEVBUF, M_WAITOK); 309 zst->zst_ebuf = zst->zst_rbuf + (zstty_rbuf_size << 1); 310 /* Disable the high water mark. */ 311 zst->zst_r_hiwat = 0; 312 zst->zst_r_lowat = 0; 313 zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf; 314 zst->zst_rbavail = zstty_rbuf_size; 315 316 /* XXX - Do we need an MD hook here? */ 317 318 /* 319 * Hardware init 320 */ 321 if (ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 322 /* Call zsparam similar to open. */ 323 struct termios t; 324 325 s = splzs(); 326 327 /* Turn on interrupts. */ 328 cs->cs_creg[1] = cs->cs_preg[1] = ZSWR1_RIE | ZSWR1_SIE; 329 zs_write_reg(cs, 1, cs->cs_creg[1]); 330 331 /* Fetch the current modem control status, needed later. */ 332 cs->cs_rr0 = zs_read_csr(cs); 333 334 splx(s); 335 336 /* Setup the "new" parameters in t. */ 337 t.c_ispeed = 0; 338 t.c_ospeed = cs->cs_defspeed; 339 t.c_cflag = cs->cs_defcflag; 340 /* Make sure zsparam will see changes. */ 341 tp->t_ospeed = 0; 342 (void) zsparam(tp, &t); 343 344 /* Make sure DTR is on now. */ 345 zs_modem(zst, 1); 346 } else { 347 /* Not the console; may need reset. */ 348 int reset; 349 reset = (channel == 0) ? 350 ZSWR9_A_RESET : ZSWR9_B_RESET; 351 s = splzs(); 352 zs_write_reg(cs, 9, reset); 353 splx(s); 354 355 /* Will raise DTR in open. */ 356 zs_modem(zst, 0); 357 } 358} 359 360 361/* 362 * Return pointer to our tty. 363 */ 364struct tty * 365zstty(dev) 366 dev_t dev; 367{ 368 struct zstty_softc *zst; 369 int unit = minor(dev); 370 371#ifdef DIAGNOSTIC 372 if (unit >= zstty_cd.cd_ndevs) 373 panic("zstty"); 374#endif 375 zst = zstty_cd.cd_devs[unit]; 376 return (zst->zst_tty); 377} 378 379 380/* 381 * Open a zs serial (tty) port. 382 */ 383int 384zsopen(dev, flags, mode, p) 385 dev_t dev; 386 int flags; 387 int mode; 388 struct proc *p; 389{ 390 struct tty *tp; 391 struct zs_chanstate *cs; 392 struct zstty_softc *zst; 393 int error, s, s2, unit; 394 395 unit = minor(dev); 396 if (unit >= zstty_cd.cd_ndevs) 397 return (ENXIO); 398 zst = zstty_cd.cd_devs[unit]; 399 if (zst == NULL) 400 return (ENXIO); 401 tp = zst->zst_tty; 402 cs = zst->zst_cs; 403 404 /* If KGDB took the line, then tp==NULL */ 405 if (tp == NULL) 406 return (EBUSY); 407 408 if (ISSET(tp->t_state, TS_ISOPEN) && 409 ISSET(tp->t_state, TS_XCLUDE) && 410 p->p_ucred->cr_uid != 0) 411 return (EBUSY); 412 413 s = spltty(); 414 415 /* We need to set this early for the benefit of zssoft(). */ 416 SET(tp->t_state, TS_WOPEN); 417 418 /* 419 * Do the following iff this is a first open. 420 */ 421 if (!ISSET(tp->t_state, TS_ISOPEN)) { 422 struct termios t; 423 424 tp->t_dev = dev; 425 426 s2 = splzs(); 427 428 /* Turn on interrupts. */ 429 cs->cs_creg[1] = cs->cs_preg[1] = ZSWR1_RIE | ZSWR1_SIE; 430 zs_write_reg(cs, 1, cs->cs_creg[1]); 431 432 /* Fetch the current modem control status, needed later. */ 433 cs->cs_rr0 = zs_read_csr(cs); 434 435 splx(s2); 436 437 /* 438 * Initialize the termios status to the defaults. Add in the 439 * sticky bits from TIOCSFLAGS. 440 */ 441 t.c_ispeed = 0; 442 t.c_ospeed = cs->cs_defspeed; 443 t.c_cflag = cs->cs_defcflag; 444 if (ISSET(zst->zst_swflags, TIOCFLAG_CLOCAL)) 445 SET(t.c_cflag, CLOCAL); 446 if (ISSET(zst->zst_swflags, TIOCFLAG_CRTSCTS)) 447 SET(t.c_cflag, CRTSCTS); 448 if (ISSET(zst->zst_swflags, TIOCFLAG_CDTRCTS)) 449 SET(t.c_cflag, CDTRCTS); 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 if not the console. */ 567 if (ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) 568 cs->cs_creg[1] = cs->cs_preg[1] = ZSWR1_RIE | ZSWR1_SIE; 569 else 570 cs->cs_creg[1] = cs->cs_preg[1] = 0; 571 zs_write_reg(cs, 1, cs->cs_creg[1]); 572 573 splx(s); 574 575 return (0); 576} 577 578/* 579 * Read/write zs serial port. 580 */ 581int 582zsread(dev, uio, flags) 583 dev_t dev; 584 struct uio *uio; 585 int flags; 586{ 587 struct zstty_softc *zst = zstty_cd.cd_devs[minor(dev)]; 588 struct tty *tp = zst->zst_tty; 589 590 return ((*linesw[tp->t_line].l_read)(tp, uio, flags)); 591} 592 593int 594zswrite(dev, uio, flags) 595 dev_t dev; 596 struct uio *uio; 597 int flags; 598{ 599 struct zstty_softc *zst = zstty_cd.cd_devs[minor(dev)]; 600 struct tty *tp = zst->zst_tty; 601 602 return ((*linesw[tp->t_line].l_write)(tp, uio, flags)); 603} 604 605int 606zsioctl(dev, cmd, data, flag, p) 607 dev_t dev; 608 u_long cmd; 609 caddr_t data; 610 int flag; 611 struct proc *p; 612{ 613 struct zstty_softc *zst = zstty_cd.cd_devs[minor(dev)]; 614 struct zs_chanstate *cs = zst->zst_cs; 615 struct tty *tp = zst->zst_tty; 616 int error; 617 618 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); 619 if (error >= 0) 620 return (error); 621 622 error = ttioctl(tp, cmd, data, flag, p); 623 if (error >= 0) 624 return (error); 625 626#ifdef ZS_MD_IOCTL 627 error = ZS_MD_IOCTL; 628 if (error >= 0) 629 return (error); 630#endif /* ZS_MD_IOCTL */ 631 632 switch (cmd) { 633 case TIOCSBRK: 634 zs_break(cs, 1); 635 break; 636 637 case TIOCCBRK: 638 zs_break(cs, 0); 639 break; 640 641 case TIOCGFLAGS: 642 *(int *)data = zst->zst_swflags; 643 break; 644 645 case TIOCSFLAGS: 646 error = suser(p->p_ucred, &p->p_acflag); 647 if (error) 648 return (error); 649 zst->zst_swflags = *(int *)data; 650 break; 651 652 case TIOCSDTR: 653 zs_modem(zst, 1); 654 break; 655 656 case TIOCCDTR: 657 zs_modem(zst, 0); 658 break; 659 660 case TIOCMSET: 661 case TIOCMBIS: 662 case TIOCMBIC: 663 case TIOCMGET: 664 default: 665 return (ENOTTY); 666 } 667 return (0); 668} 669 670/* 671 * Start or restart transmission. 672 */ 673static void 674zsstart(tp) 675 struct tty *tp; 676{ 677 struct zstty_softc *zst = zstty_cd.cd_devs[minor(tp->t_dev)]; 678 struct zs_chanstate *cs = zst->zst_cs; 679 int s; 680 681 s = spltty(); 682 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 683 goto out; 684 if (zst->zst_tx_stopped) 685 goto out; 686 687 if (tp->t_outq.c_cc <= tp->t_lowat) { 688 if (ISSET(tp->t_state, TS_ASLEEP)) { 689 CLR(tp->t_state, TS_ASLEEP); 690 wakeup((caddr_t)&tp->t_outq); 691 } 692 selwakeup(&tp->t_wsel); 693 if (tp->t_outq.c_cc == 0) 694 goto out; 695 } 696 697 /* Grab the first contiguous region of buffer space. */ 698 { 699 u_char *tba; 700 int tbc; 701 702 tba = tp->t_outq.c_cf; 703 tbc = ndqb(&tp->t_outq, 0); 704 705 (void) splzs(); 706 707 zst->zst_tba = tba; 708 zst->zst_tbc = tbc; 709 } 710 711 SET(tp->t_state, TS_BUSY); 712 zst->zst_tx_busy = 1; 713 714 /* Enable transmit completion interrupts if necessary. */ 715 if (!ISSET(cs->cs_preg[1], ZSWR1_TIE)) { 716 SET(cs->cs_preg[1], ZSWR1_TIE); 717 cs->cs_creg[1] = cs->cs_preg[1]; 718 zs_write_reg(cs, 1, cs->cs_creg[1]); 719 } 720 721 /* Output the first character of the contiguous buffer. */ 722 { 723 zs_write_data(cs, *zst->zst_tba); 724 zst->zst_tbc--; 725 zst->zst_tba++; 726 } 727out: 728 splx(s); 729 return; 730} 731 732/* 733 * Stop output, e.g., for ^S or output flush. 734 */ 735void 736zsstop(tp, flag) 737 struct tty *tp; 738 int flag; 739{ 740 struct zstty_softc *zst = zstty_cd.cd_devs[minor(tp->t_dev)]; 741 int s; 742 743 s = splzs(); 744 if (ISSET(tp->t_state, TS_BUSY)) { 745 /* Stop transmitting at the next chunk. */ 746 zst->zst_tbc = 0; 747 zst->zst_heldtbc = 0; 748 if (!ISSET(tp->t_state, TS_TTSTOP)) 749 SET(tp->t_state, TS_FLUSH); 750 } 751 splx(s); 752} 753 754/* 755 * Set ZS tty parameters from termios. 756 * XXX - Should just copy the whole termios after 757 * making sure all the changes could be done. 758 */ 759static int 760zsparam(tp, t) 761 struct tty *tp; 762 struct termios *t; 763{ 764 struct zstty_softc *zst = zstty_cd.cd_devs[minor(tp->t_dev)]; 765 struct zs_chanstate *cs = zst->zst_cs; 766 int ospeed, cflag; 767 u_char tmp3, tmp4, tmp5, tmp15; 768 int s, error; 769 770 ospeed = t->c_ospeed; 771 cflag = t->c_cflag; 772 773 /* Check requested parameters. */ 774 if (ospeed < 0) 775 return (EINVAL); 776 if (t->c_ispeed && t->c_ispeed != ospeed) 777 return (EINVAL); 778 779 /* 780 * For the console, always force CLOCAL and !HUPCL, so that the port 781 * is always active. 782 */ 783 if (ISSET(zst->zst_swflags, TIOCFLAG_SOFTCAR) || 784 ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 785 SET(cflag, CLOCAL); 786 CLR(cflag, HUPCL); 787 } 788 789 /* 790 * Only whack the UART when params change. 791 * Some callers need to clear tp->t_ospeed 792 * to make sure initialization gets done. 793 */ 794 if (tp->t_ospeed == ospeed && 795 tp->t_cflag == cflag) 796 return (0); 797 798 /* 799 * Call MD functions to deal with changed 800 * clock modes or H/W flow control modes. 801 * The BRG divisor is set now. (reg 12,13) 802 */ 803 error = zs_set_speed(cs, ospeed); 804 if (error) 805 return (error); 806 error = zs_set_modes(cs, cflag); 807 if (error) 808 return (error); 809 810 /* 811 * Block interrupts so that state will not 812 * be altered until we are done setting it up. 813 * 814 * Initial values in cs_preg are set before 815 * our attach routine is called. The master 816 * interrupt enable is handled by zsc.c 817 * 818 */ 819 s = splzs(); 820 821 cs->cs_rr0_mask = cs->cs_rr0_cts | cs->cs_rr0_dcd; 822 tmp15 = cs->cs_preg[15]; 823#if 0 824 if (ISSET(cs->cs_rr0_mask, ZSRR0_DCD)) 825 SET(tmp15, ZSWR15_DCD_IE); 826 else 827 CLR(tmp15, ZSWR15_DCD_IE); 828 if (ISSET(cs->cs_rr0_mask, ZSRR0_CTS)) 829 SET(tmp15, ZSWR15_CTS_IE); 830 else 831 CLR(tmp15, ZSWR15_CTS_IE); 832#else 833 SET(tmp15, ZSWR15_DCD_IE | ZSWR15_CTS_IE); 834#endif 835 cs->cs_preg[15] = tmp15; 836 837 /* Recompute character size bits. */ 838 tmp3 = cs->cs_preg[3]; 839 tmp5 = cs->cs_preg[5]; 840 CLR(tmp3, ZSWR3_RXSIZE); 841 CLR(tmp5, ZSWR5_TXSIZE); 842 switch (ISSET(cflag, CSIZE)) { 843 case CS5: 844 SET(tmp3, ZSWR3_RX_5); 845 SET(tmp5, ZSWR5_TX_5); 846 break; 847 case CS6: 848 SET(tmp3, ZSWR3_RX_6); 849 SET(tmp5, ZSWR5_TX_6); 850 break; 851 case CS7: 852 SET(tmp3, ZSWR3_RX_7); 853 SET(tmp5, ZSWR5_TX_7); 854 break; 855 case CS8: 856 SET(tmp3, ZSWR3_RX_8); 857 SET(tmp5, ZSWR5_TX_8); 858 break; 859 } 860 cs->cs_preg[3] = tmp3; 861 cs->cs_preg[5] = tmp5; 862 863 /* 864 * Recompute the stop bits and parity bits. Note that 865 * zs_set_speed() may have set clock selection bits etc. 866 * in wr4, so those must preserved. 867 */ 868 tmp4 = cs->cs_preg[4]; 869 CLR(tmp4, ZSWR4_SBMASK | ZSWR4_PARMASK); 870 if (ISSET(cflag, CSTOPB)) 871 SET(tmp4, ZSWR4_TWOSB); 872 else 873 SET(tmp4, ZSWR4_ONESB); 874 if (!ISSET(cflag, PARODD)) 875 SET(tmp4, ZSWR4_EVENP); 876 if (ISSET(cflag, PARENB)) 877 SET(tmp4, ZSWR4_PARENB); 878 cs->cs_preg[4] = tmp4; 879 880 /* And copy to tty. */ 881 tp->t_ispeed = 0; 882 tp->t_ospeed = ospeed; 883 tp->t_cflag = cflag; 884 885 /* 886 * If nothing is being transmitted, set up new current values, 887 * else mark them as pending. 888 */ 889 if (!cs->cs_heldchange) { 890 if (zst->zst_tx_busy) { 891 zst->zst_heldtbc = zst->zst_tbc; 892 zst->zst_tbc = 0; 893 cs->cs_heldchange = 1; 894 } else 895 zs_loadchannelregs(cs); 896 } 897 898 if (!ISSET(cflag, CHWFLOW)) { 899 /* Disable the high water mark. */ 900 zst->zst_r_hiwat = 0; 901 zst->zst_r_lowat = 0; 902 if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 903 CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 904 zst->zst_rx_ready = 1; 905 cs->cs_softreq = 1; 906 } 907 if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 908 CLR(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 909 zs_hwiflow(zst); 910 } 911 } else { 912 zst->zst_r_hiwat = zstty_rbuf_hiwat; 913 zst->zst_r_lowat = zstty_rbuf_lowat; 914 } 915 916 splx(s); 917 918 /* 919 * Update the tty layer's idea of the carrier bit, in case we changed 920 * CLOCAL or MDMBUF. We don't hang up here; we only do that by 921 * explicit request. 922 */ 923 (void) (*linesw[tp->t_line].l_modem)(tp, ISSET(cs->cs_rr0, ZSRR0_DCD)); 924 925 if (!ISSET(cflag, CHWFLOW)) { 926 if (zst->zst_tx_stopped) { 927 zst->zst_tx_stopped = 0; 928 zsstart(tp); 929 } 930 } 931 932 return (0); 933} 934 935/* 936 * Raise or lower modem control (DTR/RTS) signals. If a character is 937 * in transmission, the change is deferred. 938 */ 939static void 940zs_modem(zst, onoff) 941 struct zstty_softc *zst; 942 int onoff; 943{ 944 struct zs_chanstate *cs = zst->zst_cs; 945 int s; 946 947 if (cs->cs_wr5_dtr == 0) 948 return; 949 950 s = splzs(); 951 if (onoff) 952 SET(cs->cs_preg[5], cs->cs_wr5_dtr); 953 else 954 CLR(cs->cs_preg[5], cs->cs_wr5_dtr); 955 956 if (!cs->cs_heldchange) { 957 if (zst->zst_tx_busy) { 958 zst->zst_heldtbc = zst->zst_tbc; 959 zst->zst_tbc = 0; 960 cs->cs_heldchange = 1; 961 } else 962 zs_loadchannelregs(cs); 963 } 964 splx(s); 965} 966 967/* 968 * Try to block or unblock input using hardware flow-control. 969 * This is called by kern/tty.c if MDMBUF|CRTSCTS is set, and 970 * if this function returns non-zero, the TS_TBLOCK flag will 971 * be set or cleared according to the "block" arg passed. 972 */ 973int 974zshwiflow(tp, block) 975 struct tty *tp; 976 int block; 977{ 978 struct zstty_softc *zst = zstty_cd.cd_devs[minor(tp->t_dev)]; 979 struct zs_chanstate *cs = zst->zst_cs; 980 int s; 981 982 if (cs->cs_wr5_rts == 0) 983 return (0); 984 985 s = splzs(); 986 if (block) { 987 if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 988 SET(zst->zst_rx_flags, RX_TTY_BLOCKED); 989 zs_hwiflow(zst); 990 } 991 } else { 992 if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 993 CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 994 zst->zst_rx_ready = 1; 995 cs->cs_softreq = 1; 996 } 997 if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 998 CLR(zst->zst_rx_flags, RX_TTY_BLOCKED); 999 zs_hwiflow(zst); 1000 } 1001 } 1002 splx(s); 1003 return (1); 1004} 1005 1006/* 1007 * Internal version of zshwiflow 1008 * called at splzs 1009 */ 1010static void 1011zs_hwiflow(zst) 1012 struct zstty_softc *zst; 1013{ 1014 struct zs_chanstate *cs = zst->zst_cs; 1015 1016 if (cs->cs_wr5_rts == 0) 1017 return; 1018 1019 if (ISSET(zst->zst_rx_flags, RX_ANY_BLOCK)) { 1020 CLR(cs->cs_preg[5], cs->cs_wr5_rts); 1021 CLR(cs->cs_creg[5], cs->cs_wr5_rts); 1022 } else { 1023 SET(cs->cs_preg[5], cs->cs_wr5_rts); 1024 SET(cs->cs_creg[5], cs->cs_wr5_rts); 1025 } 1026 zs_write_reg(cs, 5, cs->cs_creg[5]); 1027} 1028 1029 1030/**************************************************************** 1031 * Interface to the lower layer (zscc) 1032 ****************************************************************/ 1033 1034static void zstty_rxint __P((struct zs_chanstate *)); 1035static void zstty_txint __P((struct zs_chanstate *)); 1036static void zstty_stint __P((struct zs_chanstate *)); 1037 1038#define integrate static inline 1039static void zstty_softint __P((struct zs_chanstate *)); 1040integrate void zstty_rxsoft __P((struct zstty_softc *, struct tty *)); 1041integrate void zstty_txsoft __P((struct zstty_softc *, struct tty *)); 1042integrate void zstty_stsoft __P((struct zstty_softc *, struct tty *)); 1043static void zstty_diag __P((void *)); 1044 1045/* 1046 * receiver ready interrupt. 1047 * called at splzs 1048 */ 1049static void 1050zstty_rxint(cs) 1051 struct zs_chanstate *cs; 1052{ 1053 struct zstty_softc *zst = cs->cs_private; 1054 u_char *put, *end; 1055 u_int cc; 1056 u_char rr0, rr1, c; 1057 1058 end = zst->zst_ebuf; 1059 put = zst->zst_rbput; 1060 cc = zst->zst_rbavail; 1061 1062 while (cc > 0) { 1063 /* 1064 * First read the status, because reading the received char 1065 * destroys the status of this char. 1066 */ 1067 rr1 = zs_read_reg(cs, 1); 1068 c = zs_read_data(cs); 1069 1070 if (ISSET(rr1, ZSRR1_FE | ZSRR1_DO | ZSRR1_PE)) { 1071 /* Clear the receive error. */ 1072 zs_write_csr(cs, ZSWR0_RESET_ERRORS); 1073 } 1074 1075 put[0] = c; 1076 put[1] = rr1; 1077 put += 2; 1078 if (put >= end) 1079 put = zst->zst_rbuf; 1080 cc--; 1081 1082 rr0 = zs_read_csr(cs); 1083 if (!ISSET(rr0, ZSRR0_RX_READY)) 1084 break; 1085 } 1086 1087 /* 1088 * Current string of incoming characters ended because 1089 * no more data was available or we ran out of space. 1090 * Schedule a receive event if any data was received. 1091 * If we're out of space, turn off receive interrupts. 1092 */ 1093 zst->zst_rbput = put; 1094 zst->zst_rbavail = cc; 1095 if (!ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1096 zst->zst_rx_ready = 1; 1097 cs->cs_softreq = 1; 1098 } 1099 1100 /* 1101 * See if we are in danger of overflowing a buffer. If 1102 * so, use hardware flow control to ease the pressure. 1103 */ 1104 if (!ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED) && 1105 cc < zst->zst_r_hiwat) { 1106 SET(zst->zst_rx_flags, RX_IBUF_BLOCKED); 1107 zs_hwiflow(zst); 1108 } 1109 1110 /* 1111 * If we're out of space, disable receive interrupts 1112 * until the queue has drained a bit. 1113 */ 1114 if (!cc) { 1115 SET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED); 1116 CLR(cs->cs_preg[1], ZSWR1_RIE); 1117 cs->cs_creg[1] = cs->cs_preg[1]; 1118 zs_write_reg(cs, 1, cs->cs_creg[1]); 1119 } 1120 1121#if 0 1122 printf("%xH%04d\n", zst->zst_rx_flags, zst->zst_rbavail); 1123#endif 1124} 1125 1126/* 1127 * transmitter ready interrupt. (splzs) 1128 */ 1129static void 1130zstty_txint(cs) 1131 struct zs_chanstate *cs; 1132{ 1133 struct zstty_softc *zst = cs->cs_private; 1134 1135 /* 1136 * If we've delayed a parameter change, do it now, and restart 1137 * output. 1138 */ 1139 if (cs->cs_heldchange) { 1140 zs_loadchannelregs(cs); 1141 cs->cs_heldchange = 0; 1142 zst->zst_tbc = zst->zst_heldtbc; 1143 zst->zst_heldtbc = 0; 1144 } 1145 1146 /* Output the next character in the buffer, if any. */ 1147 if (cs->cs_heldchar != 0) { 1148 /* An "out-of-band" character is waiting to be output */ 1149 zs_write_data(cs, cs->cs_heldchar); 1150 cs->cs_heldchar = 0; 1151 } else if (zst->zst_tbc > 0) { 1152 zs_write_data(cs, *zst->zst_tba); 1153 zst->zst_tbc--; 1154 zst->zst_tba++; 1155 } else { 1156 /* Disable transmit completion interrupts if necessary. */ 1157 if (ISSET(cs->cs_preg[1], ZSWR1_TIE)) { 1158 CLR(cs->cs_preg[1], ZSWR1_TIE); 1159 cs->cs_creg[1] = cs->cs_preg[1]; 1160 zs_write_reg(cs, 1, cs->cs_creg[1]); 1161 } 1162 if (zst->zst_tx_busy) { 1163 zst->zst_tx_busy = 0; 1164 zst->zst_tx_done = 1; 1165 cs->cs_softreq = 1; 1166 } 1167 } 1168} 1169 1170/* 1171 * status change interrupt. (splzs) 1172 */ 1173static void 1174zstty_stint(cs) 1175 struct zs_chanstate *cs; 1176{ 1177 struct zstty_softc *zst = cs->cs_private; 1178 u_char rr0, delta; 1179 1180 rr0 = zs_read_csr(cs); 1181 zs_write_csr(cs, ZSWR0_RESET_STATUS); 1182 1183 /* 1184 * Check here for console break, so that we can abort 1185 * even when interrupts are locking up the machine. 1186 */ 1187 if (ISSET(rr0, ZSRR0_BREAK) && 1188 ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 1189 zs_abort(cs); 1190 return; 1191 } 1192 1193 delta = rr0 ^ cs->cs_rr0; 1194 cs->cs_rr0 = rr0; 1195 if (ISSET(delta, cs->cs_rr0_mask)) { 1196 SET(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 (ISSET(~rr0, cs->cs_rr0_mask)) { 1203 zst->zst_tbc = 0; 1204 zst->zst_heldtbc = 0; 1205 } 1206 1207 zst->zst_st_check = 1; 1208 cs->cs_softreq = 1; 1209 } 1210} 1211 1212void 1213zstty_diag(arg) 1214 void *arg; 1215{ 1216 struct zstty_softc *zst = arg; 1217 int overflows, floods; 1218 int s; 1219 1220 s = splzs(); 1221 overflows = zst->zst_overflows; 1222 zst->zst_overflows = 0; 1223 floods = zst->zst_floods; 1224 zst->zst_floods = 0; 1225 zst->zst_errors = 0; 1226 splx(s); 1227 1228 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1229 zst->zst_dev.dv_xname, 1230 overflows, overflows == 1 ? "" : "s", 1231 floods, floods == 1 ? "" : "s"); 1232} 1233 1234integrate void 1235zstty_rxsoft(zst, tp) 1236 struct zstty_softc *zst; 1237 struct tty *tp; 1238{ 1239 struct zs_chanstate *cs = zst->zst_cs; 1240 int (*rint) __P((int c, struct tty *tp)) = linesw[tp->t_line].l_rint; 1241 u_char *get, *end; 1242 u_int cc, scc; 1243 u_char rr1; 1244 int code; 1245 int s; 1246 1247 end = zst->zst_ebuf; 1248 get = zst->zst_rbget; 1249 scc = cc = zstty_rbuf_size - zst->zst_rbavail; 1250 1251 if (cc == zstty_rbuf_size) { 1252 zst->zst_floods++; 1253 if (zst->zst_errors++ == 0) 1254 timeout(zstty_diag, zst, 60 * hz); 1255 } 1256 1257 while (cc) { 1258 code = get[0]; 1259 rr1 = get[1]; 1260 if (ISSET(rr1, ZSRR1_DO | ZSRR1_FE | ZSRR1_PE)) { 1261 if (ISSET(rr1, ZSRR1_DO)) { 1262 zst->zst_overflows++; 1263 if (zst->zst_errors++ == 0) 1264 timeout(zstty_diag, zst, 60 * hz); 1265 } 1266 if (ISSET(rr1, ZSRR1_FE)) 1267 SET(code, TTY_FE); 1268 if (ISSET(rr1, ZSRR1_PE)) 1269 SET(code, TTY_PE); 1270 } 1271 if ((*rint)(code, tp) == -1) { 1272 /* 1273 * The line discipline's buffer is out of space. 1274 */ 1275 if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1276 /* 1277 * We're either not using flow control, or the 1278 * line discipline didn't tell us to block for 1279 * some reason. Either way, we have no way to 1280 * know when there's more space available, so 1281 * just drop the rest of the data. 1282 */ 1283 get += cc << 1; 1284 if (get >= end) 1285 get -= zstty_rbuf_size << 1; 1286 cc = 0; 1287 } else { 1288 /* 1289 * Don't schedule any more receive processing 1290 * until the line discipline tells us there's 1291 * space available (through comhwiflow()). 1292 * Leave the rest of the data in the input 1293 * buffer. 1294 */ 1295 SET(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1296 } 1297 break; 1298 } 1299 get += 2; 1300 if (get >= end) 1301 get = zst->zst_rbuf; 1302 cc--; 1303 } 1304 1305 if (cc != scc) { 1306 zst->zst_rbget = get; 1307 s = splzs(); 1308 cc = zst->zst_rbavail += scc - cc; 1309 /* Buffers should be ok again, release possible block. */ 1310 if (cc >= zst->zst_r_lowat) { 1311 if (ISSET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED)) { 1312 CLR(zst->zst_rx_flags, RX_IBUF_OVERFLOWED); 1313 SET(cs->cs_preg[1], ZSWR1_RIE); 1314 cs->cs_creg[1] = cs->cs_preg[1]; 1315 zs_write_reg(cs, 1, cs->cs_creg[1]); 1316 } 1317 if (ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED)) { 1318 CLR(zst->zst_rx_flags, RX_IBUF_BLOCKED); 1319 zs_hwiflow(zst); 1320 } 1321 } 1322 splx(s); 1323 } 1324 1325#if 0 1326 printf("%xS%04d\n", zst->zst_rx_flags, zst->zst_rbavail); 1327#endif 1328} 1329 1330integrate void 1331zstty_txsoft(zst, tp) 1332 struct zstty_softc *zst; 1333 struct tty *tp; 1334{ 1335 1336 CLR(tp->t_state, TS_BUSY); 1337 if (ISSET(tp->t_state, TS_FLUSH)) 1338 CLR(tp->t_state, TS_FLUSH); 1339 else 1340 ndflush(&tp->t_outq, (int)(zst->zst_tba - tp->t_outq.c_cf)); 1341 (*linesw[tp->t_line].l_start)(tp); 1342} 1343 1344integrate void 1345zstty_stsoft(zst, tp) 1346 struct zstty_softc *zst; 1347 struct tty *tp; 1348{ 1349 struct zs_chanstate *cs = zst->zst_cs; 1350 u_char rr0, delta; 1351 int s; 1352 1353 s = splzs(); 1354 rr0 = cs->cs_rr0; 1355 delta = cs->cs_rr0_delta; 1356 cs->cs_rr0_delta = 0; 1357 splx(s); 1358 1359 if (ISSET(delta, cs->cs_rr0_dcd)) { 1360 /* 1361 * Inform the tty layer that carrier detect changed. 1362 */ 1363 (void) (*linesw[tp->t_line].l_modem)(tp, ISSET(rr0, ZSRR0_DCD)); 1364 } 1365 1366 if (ISSET(delta, cs->cs_rr0_cts)) { 1367 /* Block or unblock output according to flow control. */ 1368 if (ISSET(rr0, cs->cs_rr0_cts)) { 1369 zst->zst_tx_stopped = 0; 1370 (*linesw[tp->t_line].l_start)(tp); 1371 } else { 1372 zst->zst_tx_stopped = 1; 1373 } 1374 } 1375} 1376 1377/* 1378 * Software interrupt. Called at zssoft 1379 * 1380 * The main job to be done here is to empty the input ring 1381 * by passing its contents up to the tty layer. The ring is 1382 * always emptied during this operation, therefore the ring 1383 * must not be larger than the space after "high water" in 1384 * the tty layer, or the tty layer might drop our input. 1385 * 1386 * Note: an "input blockage" condition is assumed to exist if 1387 * EITHER the TS_TBLOCK flag or zst_rx_blocked flag is set. 1388 */ 1389static void 1390zstty_softint(cs) 1391 struct zs_chanstate *cs; 1392{ 1393 struct zstty_softc *zst = cs->cs_private; 1394 struct tty *tp = zst->zst_tty; 1395 int s; 1396 1397 s = spltty(); 1398 1399 if (zst->zst_rx_ready) { 1400 zst->zst_rx_ready = 0; 1401 zstty_rxsoft(zst, tp); 1402 } 1403 1404 if (zst->zst_st_check) { 1405 zst->zst_st_check = 0; 1406 zstty_stsoft(zst, tp); 1407 } 1408 1409 if (zst->zst_tx_done) { 1410 zst->zst_tx_done = 0; 1411 zstty_txsoft(zst, tp); 1412 } 1413 1414 splx(s); 1415} 1416 1417struct zsops zsops_tty = { 1418 zstty_rxint, /* receive char available */ 1419 zstty_stint, /* external/status */ 1420 zstty_txint, /* xmit buffer empty */ 1421 zstty_softint, /* process software interrupt */ 1422}; 1423