z8530tty.c revision 1.57
1/* $NetBSD: z8530tty.c,v 1.57 1999/02/03 20:15:51 mycroft Exp $ */ 2 3/*- 4 * Copyright (c) 1993, 1994, 1995, 1996, 1997, 1998, 1999 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 * The driver was massively overhauled in November 1997 by Charles Hannum, 98 * fixing *many* bugs, and substantially improving performance. 99 */ 100 101#include <sys/param.h> 102#include <sys/systm.h> 103#include <sys/proc.h> 104#include <sys/device.h> 105#include <sys/conf.h> 106#include <sys/file.h> 107#include <sys/ioctl.h> 108#include <sys/malloc.h> 109#include <sys/tty.h> 110#include <sys/time.h> 111#include <sys/kernel.h> 112#include <sys/syslog.h> 113 114#include <dev/ic/z8530reg.h> 115#include <machine/z8530var.h> 116 117#include <dev/cons.h> 118 119#include "locators.h" 120 121/* 122 * How many input characters we can buffer. 123 * The port-specific var.h may override this. 124 * Note: must be a power of two! 125 */ 126#ifndef ZSTTY_RING_SIZE 127#define ZSTTY_RING_SIZE 2048 128#endif 129 130/* 131 * Make this an option variable one can patch. 132 * But be warned: this must be a power of 2! 133 */ 134u_int zstty_rbuf_size = ZSTTY_RING_SIZE; 135 136/* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */ 137u_int zstty_rbuf_hiwat = (ZSTTY_RING_SIZE * 1) / 4; 138u_int zstty_rbuf_lowat = (ZSTTY_RING_SIZE * 3) / 4; 139 140struct zstty_softc { 141 struct device zst_dev; /* required first: base device */ 142 struct tty *zst_tty; 143 struct zs_chanstate *zst_cs; 144 145 u_int zst_overflows, 146 zst_floods, 147 zst_errors; 148 149 int zst_hwflags, /* see z8530var.h */ 150 zst_swflags; /* TIOCFLAG_SOFTCAR, ... <ttycom.h> */ 151 152 u_int zst_r_hiwat, 153 zst_r_lowat; 154 u_char *volatile zst_rbget, 155 *volatile zst_rbput; 156 volatile u_int zst_rbavail; 157 u_char *zst_rbuf, 158 *zst_ebuf; 159 160 /* 161 * The transmit byte count and address are used for pseudo-DMA 162 * output in the hardware interrupt code. PDMA can be suspended 163 * to get pending changes done; heldtbc is used for this. It can 164 * also be stopped for ^S; this sets TS_TTSTOP in tp->t_state. 165 */ 166 u_char *zst_tba; /* transmit buffer address */ 167 u_int zst_tbc, /* transmit byte count */ 168 zst_heldtbc; /* held tbc while xmission stopped */ 169 170 /* Flags to communicate with zstty_softint() */ 171 volatile u_char zst_rx_flags, /* receiver blocked */ 172#define RX_TTY_BLOCKED 0x01 173#define RX_TTY_OVERFLOWED 0x02 174#define RX_IBUF_BLOCKED 0x04 175#define RX_IBUF_OVERFLOWED 0x08 176#define RX_ANY_BLOCK 0x0f 177 zst_tx_busy, /* working on an output chunk */ 178 zst_tx_done, /* done with one output chunk */ 179 zst_tx_stopped, /* H/W level stop (lost CTS) */ 180 zst_st_check, /* got a status interrupt */ 181 zst_rx_ready; 182}; 183 184/* Macros to clear/set/test flags. */ 185#define SET(t, f) (t) |= (f) 186#define CLR(t, f) (t) &= ~(f) 187#define ISSET(t, f) ((t) & (f)) 188 189/* Definition of the driver for autoconfig. */ 190static int zstty_match(struct device *, struct cfdata *, void *); 191static void zstty_attach(struct device *, struct device *, void *); 192 193struct cfattach zstty_ca = { 194 sizeof(struct zstty_softc), zstty_match, zstty_attach 195}; 196 197extern struct cfdriver zstty_cd; 198 199struct zsops zsops_tty; 200 201/* Routines called from other code. */ 202cdev_decl(zs); /* open, close, read, write, ioctl, stop, ... */ 203 204static void zs_shutdown __P((struct zstty_softc *)); 205static void zsstart __P((struct tty *)); 206static int zsparam __P((struct tty *, struct termios *)); 207static void zs_modem __P((struct zstty_softc *, int)); 208static void tiocm_to_zs __P((struct zstty_softc *, struct zs_chanstate *, 209 int, int)); 210static int zs_to_tiocm __P((struct zs_chanstate *)); 211static int zshwiflow __P((struct tty *, int)); 212static void zs_hwiflow __P((struct zstty_softc *)); 213 214/* Low-level routines. */ 215static void zstty_rxint __P((struct zs_chanstate *)); 216static void zstty_stint __P((struct zs_chanstate *, int)); 217static void zstty_txint __P((struct zs_chanstate *)); 218static void zstty_softint __P((struct zs_chanstate *)); 219 220#define ZSUNIT(x) (minor(x) & 0x7ffff) 221#define ZSDIALOUT(x) (minor(x) & 0x80000) 222 223/* 224 * zstty_match: how is this zs channel configured? 225 */ 226int 227zstty_match(parent, cf, aux) 228 struct device *parent; 229 struct cfdata *cf; 230 void *aux; 231{ 232 struct zsc_attach_args *args = aux; 233 234 /* Exact match is better than wildcard. */ 235 if (cf->cf_loc[ZSCCF_CHANNEL] == args->channel) 236 return 2; 237 238 /* This driver accepts wildcard. */ 239 if (cf->cf_loc[ZSCCF_CHANNEL] == ZSCCF_CHANNEL_DEFAULT) 240 return 1; 241 242 return 0; 243} 244 245void 246zstty_attach(parent, self, aux) 247 struct device *parent, *self; 248 void *aux; 249 250{ 251 struct zsc_softc *zsc = (void *) parent; 252 struct zstty_softc *zst = (void *) self; 253 struct cfdata *cf = self->dv_cfdata; 254 struct zsc_attach_args *args = aux; 255 struct zs_chanstate *cs; 256 struct tty *tp; 257 int channel, s, tty_unit; 258 dev_t dev; 259 260 tty_unit = zst->zst_dev.dv_unit; 261 channel = args->channel; 262 cs = zsc->zsc_cs[channel]; 263 cs->cs_private = zst; 264 cs->cs_ops = &zsops_tty; 265 266 zst->zst_cs = cs; 267 zst->zst_swflags = cf->cf_flags; /* softcar, etc. */ 268 zst->zst_hwflags = args->hwflags; 269 dev = makedev(zs_major, tty_unit); 270 271 if (zst->zst_swflags) 272 printf(" flags 0x%x", zst->zst_swflags); 273 274 if (ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 275 printf(" (console)\n"); 276 DELAY(20000); 277 cn_tab->cn_dev = dev; 278 } else 279#ifdef KGDB 280 if (zs_check_kgdb(cs, dev)) { 281 /* 282 * Allow kgdb to "take over" this port. Returns true 283 * if this serial port is in-use by kgdb. 284 */ 285 printf(" (kgdb)\n"); 286 /* 287 * This is the kgdb port (exclusive use) 288 * so skip the normal attach code. 289 */ 290 return; 291 } else 292#endif 293 printf("\n"); 294 295 tp = ttymalloc(); 296 tp->t_dev = dev; 297 tp->t_oproc = zsstart; 298 tp->t_param = zsparam; 299 tp->t_hwiflow = zshwiflow; 300 tty_attach(tp); 301 302 zst->zst_tty = tp; 303 zst->zst_rbuf = malloc(zstty_rbuf_size << 1, M_DEVBUF, M_WAITOK); 304 zst->zst_ebuf = zst->zst_rbuf + (zstty_rbuf_size << 1); 305 /* Disable the high water mark. */ 306 zst->zst_r_hiwat = 0; 307 zst->zst_r_lowat = 0; 308 zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf; 309 zst->zst_rbavail = zstty_rbuf_size; 310 311 /* XXX - Do we need an MD hook here? */ 312 313 /* 314 * Hardware init 315 */ 316 if (ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 317 /* Call zsparam similar to open. */ 318 struct termios t; 319 320 /* Setup the "new" parameters in t. */ 321 t.c_ispeed = 0; 322 t.c_ospeed = cs->cs_defspeed; 323 t.c_cflag = cs->cs_defcflag; 324 325 s = splzs(); 326 327 /* 328 * Turn on receiver and status interrupts. 329 * We defer the actual write of the register to zsparam(), 330 * but we must make sure status interrupts are turned on by 331 * the time zsparam() reads the initial rr0 state. 332 */ 333 SET(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE); 334 335 splx(s); 336 337 /* Make sure zsparam will see changes. */ 338 tp->t_ospeed = 0; 339 (void) zsparam(tp, &t); 340 341 s = splzs(); 342 343 /* Make sure DTR is on now. */ 344 zs_modem(zst, 1); 345 346 splx(s); 347 } else { 348 /* Not the console; may need reset. */ 349 int reset; 350 351 reset = (channel == 0) ? ZSWR9_A_RESET : ZSWR9_B_RESET; 352 353 s = splzs(); 354 355 zs_write_reg(cs, 9, reset); 356 357 /* Will raise DTR in open. */ 358 zs_modem(zst, 0); 359 360 splx(s); 361 } 362} 363 364 365/* 366 * Return pointer to our tty. 367 */ 368struct tty * 369zstty(dev) 370 dev_t dev; 371{ 372 struct zstty_softc *zst; 373 int unit = ZSUNIT(dev); 374 375#ifdef DIAGNOSTIC 376 if (unit >= zstty_cd.cd_ndevs) 377 panic("zstty"); 378#endif 379 zst = zstty_cd.cd_devs[unit]; 380 return (zst->zst_tty); 381} 382 383 384void 385zs_shutdown(zst) 386 struct zstty_softc *zst; 387{ 388 struct zs_chanstate *cs = zst->zst_cs; 389 struct tty *tp = zst->zst_tty; 390 int s; 391 392 s = splzs(); 393 394 /* If we were asserting flow control, then deassert it. */ 395 SET(zst->zst_rx_flags, RX_IBUF_BLOCKED); 396 zs_hwiflow(zst); 397 398 /* Clear any break condition set with TIOCSBRK. */ 399 zs_break(cs, 0); 400 401 /* 402 * Hang up if necessary. Wait a bit, so the other side has time to 403 * notice even if we immediately open the port again. 404 */ 405 if (ISSET(tp->t_cflag, HUPCL)) { 406 zs_modem(zst, 0); 407 (void) tsleep(cs, TTIPRI, ttclos, hz); 408 } 409 410 /* Turn off interrupts if not the console. */ 411 if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 412 CLR(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE); 413 cs->cs_creg[1] = cs->cs_preg[1]; 414 zs_write_reg(cs, 1, cs->cs_creg[1]); 415 } 416 417 splx(s); 418} 419 420/* 421 * Open a zs serial (tty) port. 422 */ 423int 424zsopen(dev, flags, mode, p) 425 dev_t dev; 426 int flags; 427 int mode; 428 struct proc *p; 429{ 430 int unit = ZSUNIT(dev); 431 struct zstty_softc *zst; 432 struct zs_chanstate *cs; 433 struct tty *tp; 434 int s, s2; 435 int error; 436 437 if (unit >= zstty_cd.cd_ndevs) 438 return (ENXIO); 439 zst = zstty_cd.cd_devs[unit]; 440 if (zst == 0) 441 return (ENXIO); 442 tp = zst->zst_tty; 443 cs = zst->zst_cs; 444 445 /* If KGDB took the line, then tp==NULL */ 446 if (tp == NULL) 447 return (EBUSY); 448 449 if (ISSET(tp->t_state, TS_ISOPEN) && 450 ISSET(tp->t_state, TS_XCLUDE) && 451 p->p_ucred->cr_uid != 0) 452 return (EBUSY); 453 454 s = spltty(); 455 456 /* 457 * Do the following iff this is a first open. 458 */ 459 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 460 struct termios t; 461 462 tp->t_dev = dev; 463 464 /* 465 * Initialize the termios status to the defaults. Add in the 466 * sticky bits from TIOCSFLAGS. 467 */ 468 t.c_ispeed = 0; 469 t.c_ospeed = cs->cs_defspeed; 470 t.c_cflag = cs->cs_defcflag; 471 if (ISSET(zst->zst_swflags, TIOCFLAG_CLOCAL)) 472 SET(t.c_cflag, CLOCAL); 473 if (ISSET(zst->zst_swflags, TIOCFLAG_CRTSCTS)) 474 SET(t.c_cflag, CRTSCTS); 475 if (ISSET(zst->zst_swflags, TIOCFLAG_CDTRCTS)) 476 SET(t.c_cflag, CDTRCTS); 477 if (ISSET(zst->zst_swflags, TIOCFLAG_MDMBUF)) 478 SET(t.c_cflag, MDMBUF); 479 480 s2 = splzs(); 481 482 /* 483 * Turn on receiver and status interrupts. 484 * We defer the actual write of the register to zsparam(), 485 * but we must make sure status interrupts are turned on by 486 * the time zsparam() reads the initial rr0 state. 487 */ 488 SET(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE); 489 490 splx(s2); 491 492 /* Make sure zsparam will see changes. */ 493 tp->t_ospeed = 0; 494 (void) zsparam(tp, &t); 495 496 /* 497 * Note: zsparam has done: cflag, ispeed, ospeed 498 * so we just need to do: iflag, oflag, lflag, cc 499 * For "raw" mode, just leave all zeros. 500 */ 501 if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_RAW)) { 502 tp->t_iflag = TTYDEF_IFLAG; 503 tp->t_oflag = TTYDEF_OFLAG; 504 tp->t_lflag = TTYDEF_LFLAG; 505 } else { 506 tp->t_iflag = 0; 507 tp->t_oflag = 0; 508 tp->t_lflag = 0; 509 } 510 ttychars(tp); 511 ttsetwater(tp); 512 513 s2 = splzs(); 514 515 /* 516 * Turn on DTR. We must always do this, even if carrier is not 517 * present, because otherwise we'd have to use TIOCSDTR 518 * immediately after setting CLOCAL, which applications do not 519 * expect. We always assert DTR while the device is open 520 * unless explicitly requested to deassert it. 521 */ 522 zs_modem(zst, 1); 523 524 /* Clear the input ring, and unblock. */ 525 zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf; 526 zst->zst_rbavail = zstty_rbuf_size; 527 zs_iflush(cs); 528 CLR(zst->zst_rx_flags, RX_ANY_BLOCK); 529 zs_hwiflow(zst); 530 531 splx(s2); 532 } 533 534 splx(s); 535 536 error = ttyopen(tp, ZSDIALOUT(dev), ISSET(flags, O_NONBLOCK)); 537 if (error) 538 goto bad; 539 540 error = (*linesw[tp->t_line].l_open)(dev, tp); 541 if (error) 542 goto bad; 543 544 return (0); 545 546bad: 547 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 548 /* 549 * We failed to open the device, and nobody else had it opened. 550 * Clean up the state as appropriate. 551 */ 552 zs_shutdown(zst); 553 } 554 555 return (error); 556} 557 558/* 559 * Close a zs serial port. 560 */ 561int 562zsclose(dev, flags, mode, p) 563 dev_t dev; 564 int flags; 565 int mode; 566 struct proc *p; 567{ 568 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(dev)]; 569 struct tty *tp = zst->zst_tty; 570 571 /* XXX This is for cons.c. */ 572 if (!ISSET(tp->t_state, TS_ISOPEN)) 573 return 0; 574 575 (*linesw[tp->t_line].l_close)(tp, flags); 576 ttyclose(tp); 577 578 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 579 /* 580 * Although we got a last close, the device may still be in 581 * use; e.g. if this was the dialout node, and there are still 582 * processes waiting for carrier on the non-dialout node. 583 */ 584 zs_shutdown(zst); 585 } 586 587 return (0); 588} 589 590/* 591 * Read/write zs serial port. 592 */ 593int 594zsread(dev, uio, flags) 595 dev_t dev; 596 struct uio *uio; 597 int flags; 598{ 599 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(dev)]; 600 struct tty *tp = zst->zst_tty; 601 602 return ((*linesw[tp->t_line].l_read)(tp, uio, flags)); 603} 604 605int 606zswrite(dev, uio, flags) 607 dev_t dev; 608 struct uio *uio; 609 int flags; 610{ 611 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(dev)]; 612 struct tty *tp = zst->zst_tty; 613 614 return ((*linesw[tp->t_line].l_write)(tp, uio, flags)); 615} 616 617int 618zsioctl(dev, cmd, data, flag, p) 619 dev_t dev; 620 u_long cmd; 621 caddr_t data; 622 int flag; 623 struct proc *p; 624{ 625 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(dev)]; 626 struct zs_chanstate *cs = zst->zst_cs; 627 struct tty *tp = zst->zst_tty; 628 int error; 629 int s; 630 631 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); 632 if (error >= 0) 633 return (error); 634 635 error = ttioctl(tp, cmd, data, flag, p); 636 if (error >= 0) 637 return (error); 638 639#ifdef ZS_MD_IOCTL 640 error = ZS_MD_IOCTL; 641 if (error >= 0) 642 return (error); 643#endif /* ZS_MD_IOCTL */ 644 645 error = 0; 646 647 s = splzs(); 648 649 switch (cmd) { 650 case TIOCSBRK: 651 zs_break(cs, 1); 652 break; 653 654 case TIOCCBRK: 655 zs_break(cs, 0); 656 break; 657 658 case TIOCGFLAGS: 659 *(int *)data = zst->zst_swflags; 660 break; 661 662 case TIOCSFLAGS: 663 error = suser(p->p_ucred, &p->p_acflag); 664 if (error) 665 break; 666 zst->zst_swflags = *(int *)data; 667 break; 668 669 case TIOCSDTR: 670 zs_modem(zst, 1); 671 break; 672 673 case TIOCCDTR: 674 zs_modem(zst, 0); 675 break; 676 677 case TIOCMSET: 678 case TIOCMBIS: 679 case TIOCMBIC: 680 tiocm_to_zs(zst, cs, cmd, *(int *)data); 681 break; 682 683 case TIOCMGET: 684 *(int *)data = zs_to_tiocm(cs); 685 break; 686 687 default: 688 error = ENOTTY; 689 break; 690 } 691 692 splx(s); 693 694 return (error); 695} 696 697/* 698 * Start or restart transmission. 699 */ 700static void 701zsstart(tp) 702 struct tty *tp; 703{ 704 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(tp->t_dev)]; 705 struct zs_chanstate *cs = zst->zst_cs; 706 int s; 707 708 s = spltty(); 709 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 710 goto out; 711 if (zst->zst_tx_stopped) 712 goto out; 713 714 if (tp->t_outq.c_cc <= tp->t_lowat) { 715 if (ISSET(tp->t_state, TS_ASLEEP)) { 716 CLR(tp->t_state, TS_ASLEEP); 717 wakeup((caddr_t)&tp->t_outq); 718 } 719 selwakeup(&tp->t_wsel); 720 if (tp->t_outq.c_cc == 0) 721 goto out; 722 } 723 724 /* Grab the first contiguous region of buffer space. */ 725 { 726 u_char *tba; 727 int tbc; 728 729 tba = tp->t_outq.c_cf; 730 tbc = ndqb(&tp->t_outq, 0); 731 732 (void) splzs(); 733 734 zst->zst_tba = tba; 735 zst->zst_tbc = tbc; 736 } 737 738 SET(tp->t_state, TS_BUSY); 739 zst->zst_tx_busy = 1; 740 741 /* Enable transmit completion interrupts if necessary. */ 742 if (!ISSET(cs->cs_preg[1], ZSWR1_TIE)) { 743 SET(cs->cs_preg[1], ZSWR1_TIE); 744 cs->cs_creg[1] = cs->cs_preg[1]; 745 zs_write_reg(cs, 1, cs->cs_creg[1]); 746 } 747 748 /* Output the first character of the contiguous buffer. */ 749 { 750 zs_write_data(cs, *zst->zst_tba); 751 zst->zst_tbc--; 752 zst->zst_tba++; 753 } 754out: 755 splx(s); 756 return; 757} 758 759/* 760 * Stop output, e.g., for ^S or output flush. 761 */ 762void 763zsstop(tp, flag) 764 struct tty *tp; 765 int flag; 766{ 767 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(tp->t_dev)]; 768 int s; 769 770 s = splzs(); 771 if (ISSET(tp->t_state, TS_BUSY)) { 772 /* Stop transmitting at the next chunk. */ 773 zst->zst_tbc = 0; 774 zst->zst_heldtbc = 0; 775 if (!ISSET(tp->t_state, TS_TTSTOP)) 776 SET(tp->t_state, TS_FLUSH); 777 } 778 splx(s); 779} 780 781/* 782 * Set ZS tty parameters from termios. 783 * XXX - Should just copy the whole termios after 784 * making sure all the changes could be done. 785 */ 786static int 787zsparam(tp, t) 788 struct tty *tp; 789 struct termios *t; 790{ 791 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(tp->t_dev)]; 792 struct zs_chanstate *cs = zst->zst_cs; 793 int ospeed, cflag; 794 u_char tmp3, tmp4, tmp5, tmp15; 795 int s, error; 796 797 ospeed = t->c_ospeed; 798 cflag = t->c_cflag; 799 800 /* Check requested parameters. */ 801 if (ospeed < 0) 802 return (EINVAL); 803 if (t->c_ispeed && t->c_ispeed != ospeed) 804 return (EINVAL); 805 806 /* 807 * For the console, always force CLOCAL and !HUPCL, so that the port 808 * is always active. 809 */ 810 if (ISSET(zst->zst_swflags, TIOCFLAG_SOFTCAR) || 811 ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 812 SET(cflag, CLOCAL); 813 CLR(cflag, HUPCL); 814 } 815 816 /* 817 * Only whack the UART when params change. 818 * Some callers need to clear tp->t_ospeed 819 * to make sure initialization gets done. 820 */ 821 if (tp->t_ospeed == ospeed && 822 tp->t_cflag == cflag) 823 return (0); 824 825 /* 826 * Call MD functions to deal with changed 827 * clock modes or H/W flow control modes. 828 * The BRG divisor is set now. (reg 12,13) 829 */ 830 error = zs_set_speed(cs, ospeed); 831 if (error) 832 return (error); 833 error = zs_set_modes(cs, cflag); 834 if (error) 835 return (error); 836 837 /* 838 * Block interrupts so that state will not 839 * be altered until we are done setting it up. 840 * 841 * Initial values in cs_preg are set before 842 * our attach routine is called. The master 843 * interrupt enable is handled by zsc.c 844 * 845 */ 846 s = splzs(); 847 848 cs->cs_rr0_mask = cs->cs_rr0_cts | cs->cs_rr0_dcd; 849 tmp15 = cs->cs_preg[15]; 850 if (ISSET(cs->cs_rr0_mask, ZSRR0_DCD)) 851 SET(tmp15, ZSWR15_DCD_IE); 852 else 853 CLR(tmp15, ZSWR15_DCD_IE); 854 if (ISSET(cs->cs_rr0_mask, ZSRR0_CTS)) 855 SET(tmp15, ZSWR15_CTS_IE); 856 else 857 CLR(tmp15, ZSWR15_CTS_IE); 858 cs->cs_preg[15] = tmp15; 859 860 /* Recompute character size bits. */ 861 tmp3 = cs->cs_preg[3]; 862 tmp5 = cs->cs_preg[5]; 863 CLR(tmp3, ZSWR3_RXSIZE); 864 CLR(tmp5, ZSWR5_TXSIZE); 865 switch (ISSET(cflag, CSIZE)) { 866 case CS5: 867 SET(tmp3, ZSWR3_RX_5); 868 SET(tmp5, ZSWR5_TX_5); 869 break; 870 case CS6: 871 SET(tmp3, ZSWR3_RX_6); 872 SET(tmp5, ZSWR5_TX_6); 873 break; 874 case CS7: 875 SET(tmp3, ZSWR3_RX_7); 876 SET(tmp5, ZSWR5_TX_7); 877 break; 878 case CS8: 879 SET(tmp3, ZSWR3_RX_8); 880 SET(tmp5, ZSWR5_TX_8); 881 break; 882 } 883 cs->cs_preg[3] = tmp3; 884 cs->cs_preg[5] = tmp5; 885 886 /* 887 * Recompute the stop bits and parity bits. Note that 888 * zs_set_speed() may have set clock selection bits etc. 889 * in wr4, so those must preserved. 890 */ 891 tmp4 = cs->cs_preg[4]; 892 CLR(tmp4, ZSWR4_SBMASK | ZSWR4_PARMASK); 893 if (ISSET(cflag, CSTOPB)) 894 SET(tmp4, ZSWR4_TWOSB); 895 else 896 SET(tmp4, ZSWR4_ONESB); 897 if (!ISSET(cflag, PARODD)) 898 SET(tmp4, ZSWR4_EVENP); 899 if (ISSET(cflag, PARENB)) 900 SET(tmp4, ZSWR4_PARENB); 901 cs->cs_preg[4] = tmp4; 902 903 /* And copy to tty. */ 904 tp->t_ispeed = 0; 905 tp->t_ospeed = ospeed; 906 tp->t_cflag = cflag; 907 908 /* 909 * If nothing is being transmitted, set up new current values, 910 * else mark them as pending. 911 */ 912 if (!cs->cs_heldchange) { 913 if (zst->zst_tx_busy) { 914 zst->zst_heldtbc = zst->zst_tbc; 915 zst->zst_tbc = 0; 916 cs->cs_heldchange = 1; 917 } else 918 zs_loadchannelregs(cs); 919 } 920 921 /* 922 * If hardware flow control is disabled, turn off the buffer water 923 * marks and unblock any soft flow control state. Otherwise, enable 924 * the water marks. 925 */ 926 if (!ISSET(cflag, CHWFLOW)) { 927 zst->zst_r_hiwat = 0; 928 zst->zst_r_lowat = 0; 929 if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 930 CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 931 zst->zst_rx_ready = 1; 932 cs->cs_softreq = 1; 933 } 934 if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 935 CLR(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 936 zs_hwiflow(zst); 937 } 938 } else { 939 zst->zst_r_hiwat = zstty_rbuf_hiwat; 940 zst->zst_r_lowat = zstty_rbuf_lowat; 941 } 942 943 /* 944 * Force a recheck of the hardware carrier and flow control status, 945 * since we may have changed which bits we're looking at. 946 */ 947 zstty_stint(cs, 1); 948 949 splx(s); 950 951 /* 952 * If hardware flow control is disabled, unblock any hard flow control 953 * state. 954 */ 955 if (!ISSET(cflag, CHWFLOW)) { 956 if (zst->zst_tx_stopped) { 957 zst->zst_tx_stopped = 0; 958 zsstart(tp); 959 } 960 } 961 962 zstty_softint(cs); 963 964 return (0); 965} 966 967/* 968 * Raise or lower modem control (DTR/RTS) signals. If a character is 969 * in transmission, the change is deferred. 970 */ 971static void 972zs_modem(zst, onoff) 973 struct zstty_softc *zst; 974 int onoff; 975{ 976 struct zs_chanstate *cs = zst->zst_cs; 977 978 if (cs->cs_wr5_dtr == 0) 979 return; 980 981 if (onoff) 982 SET(cs->cs_preg[5], cs->cs_wr5_dtr); 983 else 984 CLR(cs->cs_preg[5], cs->cs_wr5_dtr); 985 986 if (!cs->cs_heldchange) { 987 if (zst->zst_tx_busy) { 988 zst->zst_heldtbc = zst->zst_tbc; 989 zst->zst_tbc = 0; 990 cs->cs_heldchange = 1; 991 } else 992 zs_loadchannelregs(cs); 993 } 994} 995 996static void 997tiocm_to_zs(zst, cs, how, ttybits) 998 struct zstty_softc *zst; 999 struct zs_chanstate *cs; 1000 int how, ttybits; 1001{ 1002 int s; 1003 u_char zsbits, tmp5; 1004 1005 zsbits = 0; 1006 if (ISSET(ttybits, TIOCM_DTR)) 1007 SET(zsbits, ZSWR5_DTR); 1008 if (ISSET(ttybits, TIOCM_RTS)) 1009 SET(zsbits, ZSWR5_RTS); 1010 1011 s = splzs(); 1012 1013 tmp5 = cs->cs_preg[5]; 1014 switch (how) { 1015 case TIOCMBIC: 1016 CLR(tmp5, zsbits); 1017 break; 1018 1019 case TIOCMBIS: 1020 SET(tmp5, zsbits); 1021 break; 1022 1023 case TIOCMSET: 1024 CLR(tmp5, ZSWR5_RTS | ZSWR5_DTR); 1025 SET(tmp5, zsbits); 1026 break; 1027 } 1028 cs->cs_preg[5] = tmp5; 1029 1030 if (!cs->cs_heldchange) { 1031 if (zst->zst_tx_busy) { 1032 zst->zst_heldtbc = zst->zst_tbc; 1033 zst->zst_tbc = 0; 1034 cs->cs_heldchange = 1; 1035 } else 1036 zs_loadchannelregs(cs); 1037 } 1038 1039 splx(s); 1040} 1041 1042static int 1043zs_to_tiocm(cs) 1044 struct zs_chanstate *cs; 1045{ 1046 u_char zsbits; 1047 int ttybits = 0; 1048 1049 zsbits = cs->cs_preg[5]; 1050 if (ISSET(zsbits, ZSWR5_DTR)) 1051 SET(ttybits, TIOCM_DTR); 1052 if (ISSET(zsbits, ZSWR5_RTS)) 1053 SET(ttybits, TIOCM_RTS); 1054 1055 zsbits = cs->cs_rr0; 1056 if (ISSET(zsbits, ZSRR0_DCD)) 1057 SET(ttybits, TIOCM_CD); 1058 if (ISSET(zsbits, ZSRR0_CTS)) 1059 SET(ttybits, TIOCM_CTS); 1060 1061 return (ttybits); 1062} 1063 1064/* 1065 * Try to block or unblock input using hardware flow-control. 1066 * This is called by kern/tty.c if MDMBUF|CRTSCTS is set, and 1067 * if this function returns non-zero, the TS_TBLOCK flag will 1068 * be set or cleared according to the "block" arg passed. 1069 */ 1070int 1071zshwiflow(tp, block) 1072 struct tty *tp; 1073 int block; 1074{ 1075 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(tp->t_dev)]; 1076 struct zs_chanstate *cs = zst->zst_cs; 1077 int s; 1078 1079 if (cs->cs_wr5_rts == 0) 1080 return (0); 1081 1082 s = splzs(); 1083 if (block) { 1084 if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1085 SET(zst->zst_rx_flags, RX_TTY_BLOCKED); 1086 zs_hwiflow(zst); 1087 } 1088 } else { 1089 if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1090 CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1091 zst->zst_rx_ready = 1; 1092 cs->cs_softreq = 1; 1093 } 1094 if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1095 CLR(zst->zst_rx_flags, RX_TTY_BLOCKED); 1096 zs_hwiflow(zst); 1097 } 1098 } 1099 splx(s); 1100 return (1); 1101} 1102 1103/* 1104 * Internal version of zshwiflow 1105 * called at splzs 1106 */ 1107static void 1108zs_hwiflow(zst) 1109 struct zstty_softc *zst; 1110{ 1111 struct zs_chanstate *cs = zst->zst_cs; 1112 1113 if (cs->cs_wr5_rts == 0) 1114 return; 1115 1116 if (ISSET(zst->zst_rx_flags, RX_ANY_BLOCK)) { 1117 CLR(cs->cs_preg[5], cs->cs_wr5_rts); 1118 CLR(cs->cs_creg[5], cs->cs_wr5_rts); 1119 } else { 1120 SET(cs->cs_preg[5], cs->cs_wr5_rts); 1121 SET(cs->cs_creg[5], cs->cs_wr5_rts); 1122 } 1123 zs_write_reg(cs, 5, cs->cs_creg[5]); 1124} 1125 1126 1127/**************************************************************** 1128 * Interface to the lower layer (zscc) 1129 ****************************************************************/ 1130 1131#define integrate static inline 1132integrate void zstty_rxsoft __P((struct zstty_softc *, struct tty *)); 1133integrate void zstty_txsoft __P((struct zstty_softc *, struct tty *)); 1134integrate void zstty_stsoft __P((struct zstty_softc *, struct tty *)); 1135static void zstty_diag __P((void *)); 1136 1137/* 1138 * receiver ready interrupt. 1139 * called at splzs 1140 */ 1141static void 1142zstty_rxint(cs) 1143 struct zs_chanstate *cs; 1144{ 1145 struct zstty_softc *zst = cs->cs_private; 1146 u_char *put, *end; 1147 u_int cc; 1148 u_char rr0, rr1, c; 1149 1150 end = zst->zst_ebuf; 1151 put = zst->zst_rbput; 1152 cc = zst->zst_rbavail; 1153 1154 while (cc > 0) { 1155 /* 1156 * First read the status, because reading the received char 1157 * destroys the status of this char. 1158 */ 1159 rr1 = zs_read_reg(cs, 1); 1160 c = zs_read_data(cs); 1161 1162 if (ISSET(rr1, ZSRR1_FE | ZSRR1_DO | ZSRR1_PE)) { 1163 /* Clear the receive error. */ 1164 zs_write_csr(cs, ZSWR0_RESET_ERRORS); 1165 } 1166 1167 put[0] = c; 1168 put[1] = rr1; 1169 put += 2; 1170 if (put >= end) 1171 put = zst->zst_rbuf; 1172 cc--; 1173 1174 rr0 = zs_read_csr(cs); 1175 if (!ISSET(rr0, ZSRR0_RX_READY)) 1176 break; 1177 } 1178 1179 /* 1180 * Current string of incoming characters ended because 1181 * no more data was available or we ran out of space. 1182 * Schedule a receive event if any data was received. 1183 * If we're out of space, turn off receive interrupts. 1184 */ 1185 zst->zst_rbput = put; 1186 zst->zst_rbavail = cc; 1187 if (!ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1188 zst->zst_rx_ready = 1; 1189 cs->cs_softreq = 1; 1190 } 1191 1192 /* 1193 * See if we are in danger of overflowing a buffer. If 1194 * so, use hardware flow control to ease the pressure. 1195 */ 1196 if (!ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED) && 1197 cc < zst->zst_r_hiwat) { 1198 SET(zst->zst_rx_flags, RX_IBUF_BLOCKED); 1199 zs_hwiflow(zst); 1200 } 1201 1202 /* 1203 * If we're out of space, disable receive interrupts 1204 * until the queue has drained a bit. 1205 */ 1206 if (!cc) { 1207 SET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED); 1208 CLR(cs->cs_preg[1], ZSWR1_RIE); 1209 cs->cs_creg[1] = cs->cs_preg[1]; 1210 zs_write_reg(cs, 1, cs->cs_creg[1]); 1211 } 1212 1213#if 0 1214 printf("%xH%04d\n", zst->zst_rx_flags, zst->zst_rbavail); 1215#endif 1216} 1217 1218/* 1219 * transmitter ready interrupt. (splzs) 1220 */ 1221static void 1222zstty_txint(cs) 1223 struct zs_chanstate *cs; 1224{ 1225 struct zstty_softc *zst = cs->cs_private; 1226 1227 /* 1228 * If we've delayed a parameter change, do it now, and restart 1229 * output. 1230 */ 1231 if (cs->cs_heldchange) { 1232 zs_loadchannelregs(cs); 1233 cs->cs_heldchange = 0; 1234 zst->zst_tbc = zst->zst_heldtbc; 1235 zst->zst_heldtbc = 0; 1236 } 1237 1238 /* Output the next character in the buffer, if any. */ 1239 if (zst->zst_tbc > 0) { 1240 zs_write_data(cs, *zst->zst_tba); 1241 zst->zst_tbc--; 1242 zst->zst_tba++; 1243 } else { 1244 /* Disable transmit completion interrupts if necessary. */ 1245 if (ISSET(cs->cs_preg[1], ZSWR1_TIE)) { 1246 CLR(cs->cs_preg[1], ZSWR1_TIE); 1247 cs->cs_creg[1] = cs->cs_preg[1]; 1248 zs_write_reg(cs, 1, cs->cs_creg[1]); 1249 } 1250 if (zst->zst_tx_busy) { 1251 zst->zst_tx_busy = 0; 1252 zst->zst_tx_done = 1; 1253 cs->cs_softreq = 1; 1254 } 1255 } 1256} 1257 1258/* 1259 * status change interrupt. (splzs) 1260 */ 1261static void 1262zstty_stint(cs, force) 1263 struct zs_chanstate *cs; 1264 int force; 1265{ 1266 struct zstty_softc *zst = cs->cs_private; 1267 u_char rr0, delta; 1268 1269 rr0 = zs_read_csr(cs); 1270 zs_write_csr(cs, ZSWR0_RESET_STATUS); 1271 1272 /* 1273 * Check here for console break, so that we can abort 1274 * even when interrupts are locking up the machine. 1275 */ 1276 if (ISSET(rr0, ZSRR0_BREAK) && 1277 ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 1278 zs_abort(cs); 1279 return; 1280 } 1281 1282 if (!force) 1283 delta = rr0 ^ cs->cs_rr0; 1284 else 1285 delta = cs->cs_rr0_mask; 1286 cs->cs_rr0 = rr0; 1287 1288 if (ISSET(delta, cs->cs_rr0_mask)) { 1289 SET(cs->cs_rr0_delta, delta); 1290 1291 /* 1292 * Stop output immediately if we lose the output 1293 * flow control signal or carrier detect. 1294 */ 1295 if (ISSET(~rr0, cs->cs_rr0_mask)) { 1296 zst->zst_tbc = 0; 1297 zst->zst_heldtbc = 0; 1298 } 1299 1300 zst->zst_st_check = 1; 1301 cs->cs_softreq = 1; 1302 } 1303} 1304 1305void 1306zstty_diag(arg) 1307 void *arg; 1308{ 1309 struct zstty_softc *zst = arg; 1310 int overflows, floods; 1311 int s; 1312 1313 s = splzs(); 1314 overflows = zst->zst_overflows; 1315 zst->zst_overflows = 0; 1316 floods = zst->zst_floods; 1317 zst->zst_floods = 0; 1318 zst->zst_errors = 0; 1319 splx(s); 1320 1321 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1322 zst->zst_dev.dv_xname, 1323 overflows, overflows == 1 ? "" : "s", 1324 floods, floods == 1 ? "" : "s"); 1325} 1326 1327integrate void 1328zstty_rxsoft(zst, tp) 1329 struct zstty_softc *zst; 1330 struct tty *tp; 1331{ 1332 struct zs_chanstate *cs = zst->zst_cs; 1333 int (*rint) __P((int c, struct tty *tp)) = linesw[tp->t_line].l_rint; 1334 u_char *get, *end; 1335 u_int cc, scc; 1336 u_char rr1; 1337 int code; 1338 int s; 1339 1340 end = zst->zst_ebuf; 1341 get = zst->zst_rbget; 1342 scc = cc = zstty_rbuf_size - zst->zst_rbavail; 1343 1344 if (cc == zstty_rbuf_size) { 1345 zst->zst_floods++; 1346 if (zst->zst_errors++ == 0) 1347 timeout(zstty_diag, zst, 60 * hz); 1348 } 1349 1350 while (cc) { 1351 code = get[0]; 1352 rr1 = get[1]; 1353 if (ISSET(rr1, ZSRR1_DO | ZSRR1_FE | ZSRR1_PE)) { 1354 if (ISSET(rr1, ZSRR1_DO)) { 1355 zst->zst_overflows++; 1356 if (zst->zst_errors++ == 0) 1357 timeout(zstty_diag, zst, 60 * hz); 1358 } 1359 if (ISSET(rr1, ZSRR1_FE)) 1360 SET(code, TTY_FE); 1361 if (ISSET(rr1, ZSRR1_PE)) 1362 SET(code, TTY_PE); 1363 } 1364 if ((*rint)(code, tp) == -1) { 1365 /* 1366 * The line discipline's buffer is out of space. 1367 */ 1368 if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1369 /* 1370 * We're either not using flow control, or the 1371 * line discipline didn't tell us to block for 1372 * some reason. Either way, we have no way to 1373 * know when there's more space available, so 1374 * just drop the rest of the data. 1375 */ 1376 get += cc << 1; 1377 if (get >= end) 1378 get -= zstty_rbuf_size << 1; 1379 cc = 0; 1380 } else { 1381 /* 1382 * Don't schedule any more receive processing 1383 * until the line discipline tells us there's 1384 * space available (through comhwiflow()). 1385 * Leave the rest of the data in the input 1386 * buffer. 1387 */ 1388 SET(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1389 } 1390 break; 1391 } 1392 get += 2; 1393 if (get >= end) 1394 get = zst->zst_rbuf; 1395 cc--; 1396 } 1397 1398 if (cc != scc) { 1399 zst->zst_rbget = get; 1400 s = splzs(); 1401 cc = zst->zst_rbavail += scc - cc; 1402 /* Buffers should be ok again, release possible block. */ 1403 if (cc >= zst->zst_r_lowat) { 1404 if (ISSET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED)) { 1405 CLR(zst->zst_rx_flags, RX_IBUF_OVERFLOWED); 1406 SET(cs->cs_preg[1], ZSWR1_RIE); 1407 cs->cs_creg[1] = cs->cs_preg[1]; 1408 zs_write_reg(cs, 1, cs->cs_creg[1]); 1409 } 1410 if (ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED)) { 1411 CLR(zst->zst_rx_flags, RX_IBUF_BLOCKED); 1412 zs_hwiflow(zst); 1413 } 1414 } 1415 splx(s); 1416 } 1417 1418#if 0 1419 printf("%xS%04d\n", zst->zst_rx_flags, zst->zst_rbavail); 1420#endif 1421} 1422 1423integrate void 1424zstty_txsoft(zst, tp) 1425 struct zstty_softc *zst; 1426 struct tty *tp; 1427{ 1428 1429 CLR(tp->t_state, TS_BUSY); 1430 if (ISSET(tp->t_state, TS_FLUSH)) 1431 CLR(tp->t_state, TS_FLUSH); 1432 else 1433 ndflush(&tp->t_outq, (int)(zst->zst_tba - tp->t_outq.c_cf)); 1434 (*linesw[tp->t_line].l_start)(tp); 1435} 1436 1437integrate void 1438zstty_stsoft(zst, tp) 1439 struct zstty_softc *zst; 1440 struct tty *tp; 1441{ 1442 struct zs_chanstate *cs = zst->zst_cs; 1443 u_char rr0, delta; 1444 int s; 1445 1446 s = splzs(); 1447 rr0 = cs->cs_rr0; 1448 delta = cs->cs_rr0_delta; 1449 cs->cs_rr0_delta = 0; 1450 splx(s); 1451 1452 if (ISSET(delta, cs->cs_rr0_dcd)) { 1453 /* 1454 * Inform the tty layer that carrier detect changed. 1455 */ 1456 (void) (*linesw[tp->t_line].l_modem)(tp, ISSET(rr0, ZSRR0_DCD)); 1457 } 1458 1459 if (ISSET(delta, cs->cs_rr0_cts)) { 1460 /* Block or unblock output according to flow control. */ 1461 if (ISSET(rr0, cs->cs_rr0_cts)) { 1462 zst->zst_tx_stopped = 0; 1463 (*linesw[tp->t_line].l_start)(tp); 1464 } else { 1465 zst->zst_tx_stopped = 1; 1466 } 1467 } 1468} 1469 1470/* 1471 * Software interrupt. Called at zssoft 1472 * 1473 * The main job to be done here is to empty the input ring 1474 * by passing its contents up to the tty layer. The ring is 1475 * always emptied during this operation, therefore the ring 1476 * must not be larger than the space after "high water" in 1477 * the tty layer, or the tty layer might drop our input. 1478 * 1479 * Note: an "input blockage" condition is assumed to exist if 1480 * EITHER the TS_TBLOCK flag or zst_rx_blocked flag is set. 1481 */ 1482static void 1483zstty_softint(cs) 1484 struct zs_chanstate *cs; 1485{ 1486 struct zstty_softc *zst = cs->cs_private; 1487 struct tty *tp = zst->zst_tty; 1488 int s; 1489 1490 s = spltty(); 1491 1492 if (zst->zst_rx_ready) { 1493 zst->zst_rx_ready = 0; 1494 zstty_rxsoft(zst, tp); 1495 } 1496 1497 if (zst->zst_st_check) { 1498 zst->zst_st_check = 0; 1499 zstty_stsoft(zst, tp); 1500 } 1501 1502 if (zst->zst_tx_done) { 1503 zst->zst_tx_done = 0; 1504 zstty_txsoft(zst, tp); 1505 } 1506 1507 splx(s); 1508} 1509 1510struct zsops zsops_tty = { 1511 zstty_rxint, /* receive char available */ 1512 zstty_stint, /* external/status */ 1513 zstty_txint, /* xmit buffer empty */ 1514 zstty_softint, /* process software interrupt */ 1515}; 1516