z8530tty.c revision 1.53
1 /* $NetBSD: z8530tty.c,v 1.53 1998/11/23 22:10:09 wrstuden Exp $ */ 2 3 /*- 4 * Copyright (c) 1993, 1994, 1995, 1996, 1997, 1998 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 (at) netbsd.org>, 94 * Bill Studenmund <wrstuden (at) loki.stanford.edu> 95 * Ian Dall <Ian.Dall (at) 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 <dev/cons.h> 115 116 #include "locators.h" 117 118 /* 119 * How many input characters we can buffer. 120 * The port-specific var.h may override this. 121 * Note: must be a power of two! 122 */ 123 #ifndef ZSTTY_RING_SIZE 124 #define ZSTTY_RING_SIZE 2048 125 #endif 126 127 /* 128 * Make this an option variable one can patch. 129 * But be warned: this must be a power of 2! 130 */ 131 u_int zstty_rbuf_size = ZSTTY_RING_SIZE; 132 133 /* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */ 134 u_int zstty_rbuf_hiwat = (ZSTTY_RING_SIZE * 1) / 4; 135 u_int zstty_rbuf_lowat = (ZSTTY_RING_SIZE * 3) / 4; 136 137 struct zstty_softc { 138 struct device zst_dev; /* required first: base device */ 139 struct tty *zst_tty; 140 struct zs_chanstate *zst_cs; 141 142 u_int zst_overflows, 143 zst_floods, 144 zst_errors; 145 146 int zst_hwflags, /* see z8530var.h */ 147 zst_swflags; /* TIOCFLAG_SOFTCAR, ... <ttycom.h> */ 148 149 u_int zst_r_hiwat, 150 zst_r_lowat; 151 u_char *volatile zst_rbget, 152 *volatile zst_rbput; 153 volatile u_int zst_rbavail; 154 u_char *zst_rbuf, 155 *zst_ebuf; 156 157 /* 158 * The transmit byte count and address are used for pseudo-DMA 159 * output in the hardware interrupt code. PDMA can be suspended 160 * to get pending changes done; heldtbc is used for this. It can 161 * also be stopped for ^S; this sets TS_TTSTOP in tp->t_state. 162 */ 163 u_char *zst_tba; /* transmit buffer address */ 164 u_int zst_tbc, /* transmit byte count */ 165 zst_heldtbc; /* held tbc while xmission stopped */ 166 167 /* Flags to communicate with zstty_softint() */ 168 volatile u_char zst_rx_flags, /* receiver blocked */ 169 #define RX_TTY_BLOCKED 0x01 170 #define RX_TTY_OVERFLOWED 0x02 171 #define RX_IBUF_BLOCKED 0x04 172 #define RX_IBUF_OVERFLOWED 0x08 173 #define RX_ANY_BLOCK 0x0f 174 zst_tx_busy, /* working on an output chunk */ 175 zst_tx_done, /* done with one output chunk */ 176 zst_tx_stopped, /* H/W level stop (lost CTS) */ 177 zst_st_check, /* got a status interrupt */ 178 zst_rx_ready; 179 }; 180 181 /* Macros to clear/set/test flags. */ 182 #define SET(t, f) (t) |= (f) 183 #define CLR(t, f) (t) &= ~(f) 184 #define ISSET(t, f) ((t) & (f)) 185 186 /* Definition of the driver for autoconfig. */ 187 static int zstty_match(struct device *, struct cfdata *, void *); 188 static void zstty_attach(struct device *, struct device *, void *); 189 190 struct cfattach zstty_ca = { 191 sizeof(struct zstty_softc), zstty_match, zstty_attach 192 }; 193 194 extern struct cfdriver zstty_cd; 195 196 struct zsops zsops_tty; 197 198 /* Routines called from other code. */ 199 cdev_decl(zs); /* open, close, read, write, ioctl, stop, ... */ 200 201 static void zs_shutdown __P((struct zstty_softc *)); 202 static void zsstart __P((struct tty *)); 203 static int zsparam __P((struct tty *, struct termios *)); 204 static void zs_modem __P((struct zstty_softc *zst, int onoff)); 205 static int zshwiflow __P((struct tty *, int)); 206 static void zs_hwiflow __P((struct zstty_softc *)); 207 208 #define ZSUNIT(x) (minor(x) & 0x7ffff) 209 #define ZSDIALOUT(x) (minor(x) & 0x80000) 210 211 /* 212 * zstty_match: how is this zs channel configured? 213 */ 214 int 215 zstty_match(parent, cf, aux) 216 struct device *parent; 217 struct cfdata *cf; 218 void *aux; 219 { 220 struct zsc_attach_args *args = aux; 221 222 /* Exact match is better than wildcard. */ 223 if (cf->cf_loc[ZSCCF_CHANNEL] == args->channel) 224 return 2; 225 226 /* This driver accepts wildcard. */ 227 if (cf->cf_loc[ZSCCF_CHANNEL] == ZSCCF_CHANNEL_DEFAULT) 228 return 1; 229 230 return 0; 231 } 232 233 void 234 zstty_attach(parent, self, aux) 235 struct device *parent, *self; 236 void *aux; 237 238 { 239 struct zsc_softc *zsc = (void *) parent; 240 struct zstty_softc *zst = (void *) self; 241 struct cfdata *cf = self->dv_cfdata; 242 struct zsc_attach_args *args = aux; 243 struct zs_chanstate *cs; 244 struct tty *tp; 245 int channel, s, tty_unit; 246 dev_t dev; 247 248 tty_unit = zst->zst_dev.dv_unit; 249 channel = args->channel; 250 cs = zsc->zsc_cs[channel]; 251 cs->cs_private = zst; 252 cs->cs_ops = &zsops_tty; 253 254 zst->zst_cs = cs; 255 zst->zst_swflags = cf->cf_flags; /* softcar, etc. */ 256 zst->zst_hwflags = args->hwflags; 257 dev = makedev(zs_major, tty_unit); 258 259 if (zst->zst_swflags) 260 printf(" flags 0x%x", zst->zst_swflags); 261 262 if (ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 263 printf(" (console)"); 264 cn_tab->cn_dev = dev; 265 } else { 266 #ifdef KGDB 267 /* 268 * Allow kgdb to "take over" this port. Returns true 269 * if this serial port is in-use by kgdb. 270 */ 271 if (zs_check_kgdb(cs, dev)) { 272 printf(" (kgdb)\n"); 273 /* 274 * This is the kgdb port (exclusive use) 275 * so skip the normal attach code. 276 */ 277 return; 278 } 279 #endif 280 } 281 printf("\n"); 282 283 tp = ttymalloc(); 284 tp->t_dev = dev; 285 tp->t_oproc = zsstart; 286 tp->t_param = zsparam; 287 tp->t_hwiflow = zshwiflow; 288 tty_attach(tp); 289 290 zst->zst_tty = tp; 291 zst->zst_rbuf = malloc(zstty_rbuf_size << 1, M_DEVBUF, M_WAITOK); 292 zst->zst_ebuf = zst->zst_rbuf + (zstty_rbuf_size << 1); 293 /* Disable the high water mark. */ 294 zst->zst_r_hiwat = 0; 295 zst->zst_r_lowat = 0; 296 zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf; 297 zst->zst_rbavail = zstty_rbuf_size; 298 299 /* XXX - Do we need an MD hook here? */ 300 301 /* 302 * Hardware init 303 */ 304 if (ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 305 /* Call zsparam similar to open. */ 306 struct termios t; 307 308 DELAY(20000); 309 310 s = splzs(); 311 312 /* Fetch the current modem control status, needed later. */ 313 cs->cs_rr0 = zs_read_csr(cs); 314 315 splx(s); 316 317 /* Setup the "new" parameters in t. */ 318 t.c_ispeed = 0; 319 t.c_ospeed = cs->cs_defspeed; 320 t.c_cflag = cs->cs_defcflag; 321 /* Make sure zsparam will see changes. */ 322 tp->t_ospeed = 0; 323 324 /* Turn on interrupts when zsparam writes the chip. */ 325 cs->cs_creg[1] = cs->cs_preg[1] = ZSWR1_RIE | ZSWR1_SIE; 326 327 (void) zsparam(tp, &t); 328 329 s = splzs(); 330 331 /* Make sure DTR is on now. */ 332 zs_modem(zst, 1); 333 334 splx(s); 335 } else { 336 /* Not the console; may need reset. */ 337 int reset; 338 339 reset = (channel == 0) ? ZSWR9_A_RESET : ZSWR9_B_RESET; 340 341 s = splzs(); 342 343 zs_write_reg(cs, 9, reset); 344 345 /* Will raise DTR in open. */ 346 zs_modem(zst, 0); 347 348 splx(s); 349 } 350 } 351 352 353 /* 354 * Return pointer to our tty. 355 */ 356 struct tty * 357 zstty(dev) 358 dev_t dev; 359 { 360 struct zstty_softc *zst; 361 int unit = ZSUNIT(dev); 362 363 #ifdef DIAGNOSTIC 364 if (unit >= zstty_cd.cd_ndevs) 365 panic("zstty"); 366 #endif 367 zst = zstty_cd.cd_devs[unit]; 368 return (zst->zst_tty); 369 } 370 371 372 void 373 zs_shutdown(zst) 374 struct zstty_softc *zst; 375 { 376 struct zs_chanstate *cs = zst->zst_cs; 377 struct tty *tp = zst->zst_tty; 378 int s; 379 380 s = splzs(); 381 382 /* If we were asserting flow control, then deassert it. */ 383 SET(zst->zst_rx_flags, RX_IBUF_BLOCKED); 384 zs_hwiflow(zst); 385 386 /* Clear any break condition set with TIOCSBRK. */ 387 zs_break(cs, 0); 388 389 /* 390 * Hang up if necessary. Wait a bit, so the other side has time to 391 * notice even if we immediately open the port again. 392 */ 393 if (ISSET(tp->t_cflag, HUPCL)) { 394 zs_modem(zst, 0); 395 (void) tsleep(cs, TTIPRI, ttclos, hz); 396 } 397 398 /* Turn off interrupts if not the console. */ 399 if (ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) 400 cs->cs_creg[1] = cs->cs_preg[1] = ZSWR1_RIE | ZSWR1_SIE; 401 else 402 cs->cs_creg[1] = cs->cs_preg[1] = 0; 403 zs_write_reg(cs, 1, cs->cs_creg[1]); 404 405 splx(s); 406 } 407 408 /* 409 * Open a zs serial (tty) port. 410 */ 411 int 412 zsopen(dev, flags, mode, p) 413 dev_t dev; 414 int flags; 415 int mode; 416 struct proc *p; 417 { 418 int unit = ZSUNIT(dev); 419 struct zstty_softc *zst; 420 struct zs_chanstate *cs; 421 struct tty *tp; 422 int s, s2; 423 int error; 424 425 if (unit >= zstty_cd.cd_ndevs) 426 return (ENXIO); 427 zst = zstty_cd.cd_devs[unit]; 428 if (zst == 0) 429 return (ENXIO); 430 tp = zst->zst_tty; 431 cs = zst->zst_cs; 432 433 /* If KGDB took the line, then tp==NULL */ 434 if (tp == NULL) 435 return (EBUSY); 436 437 if (ISSET(tp->t_state, TS_ISOPEN) && 438 ISSET(tp->t_state, TS_XCLUDE) && 439 p->p_ucred->cr_uid != 0) 440 return (EBUSY); 441 442 s = spltty(); 443 444 /* 445 * Do the following iff this is a first open. 446 */ 447 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 448 struct termios t; 449 450 tp->t_dev = dev; 451 452 s2 = splzs(); 453 454 /* Turn on interrupts. */ 455 cs->cs_creg[1] = cs->cs_preg[1] = ZSWR1_RIE | ZSWR1_SIE; 456 zs_write_reg(cs, 1, cs->cs_creg[1]); 457 458 /* Fetch the current modem control status, needed later. */ 459 cs->cs_rr0 = zs_read_csr(cs); 460 461 splx(s2); 462 463 /* 464 * Initialize the termios status to the defaults. Add in the 465 * sticky bits from TIOCSFLAGS. 466 */ 467 t.c_ispeed = 0; 468 t.c_ospeed = cs->cs_defspeed; 469 t.c_cflag = cs->cs_defcflag; 470 if (ISSET(zst->zst_swflags, TIOCFLAG_CLOCAL)) 471 SET(t.c_cflag, CLOCAL); 472 if (ISSET(zst->zst_swflags, TIOCFLAG_CRTSCTS)) 473 SET(t.c_cflag, CRTSCTS); 474 if (ISSET(zst->zst_swflags, TIOCFLAG_CDTRCTS)) 475 SET(t.c_cflag, CDTRCTS); 476 if (ISSET(zst->zst_swflags, TIOCFLAG_MDMBUF)) 477 SET(t.c_cflag, MDMBUF); 478 /* Make sure zsparam will see changes. */ 479 tp->t_ospeed = 0; 480 (void) zsparam(tp, &t); 481 /* 482 * Note: zsparam has done: cflag, ispeed, ospeed 483 * so we just need to do: iflag, oflag, lflag, cc 484 * For "raw" mode, just leave all zeros. 485 */ 486 if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_RAW)) { 487 tp->t_iflag = TTYDEF_IFLAG; 488 tp->t_oflag = TTYDEF_OFLAG; 489 tp->t_lflag = TTYDEF_LFLAG; 490 } else { 491 tp->t_iflag = 0; 492 tp->t_oflag = 0; 493 tp->t_lflag = 0; 494 } 495 ttychars(tp); 496 ttsetwater(tp); 497 498 s2 = splzs(); 499 500 /* 501 * Turn on DTR. We must always do this, even if carrier is not 502 * present, because otherwise we'd have to use TIOCSDTR 503 * immediately after setting CLOCAL, which applications do not 504 * expect. We always assert DTR while the device is open 505 * unless explicitly requested to deassert it. 506 */ 507 zs_modem(zst, 1); 508 509 /* Clear the input ring, and unblock. */ 510 zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf; 511 zst->zst_rbavail = zstty_rbuf_size; 512 zs_iflush(cs); 513 CLR(zst->zst_rx_flags, RX_ANY_BLOCK); 514 zs_hwiflow(zst); 515 516 splx(s2); 517 } 518 519 splx(s); 520 521 error = ttyopen(tp, ZSDIALOUT(dev), ISSET(flags, O_NONBLOCK)); 522 if (error) 523 goto bad; 524 525 error = (*linesw[tp->t_line].l_open)(dev, tp); 526 if (error) 527 goto bad; 528 529 return (0); 530 531 bad: 532 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 533 /* 534 * We failed to open the device, and nobody else had it opened. 535 * Clean up the state as appropriate. 536 */ 537 zs_shutdown(zst); 538 } 539 540 return (error); 541 } 542 543 /* 544 * Close a zs serial port. 545 */ 546 int 547 zsclose(dev, flags, mode, p) 548 dev_t dev; 549 int flags; 550 int mode; 551 struct proc *p; 552 { 553 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(dev)]; 554 struct tty *tp = zst->zst_tty; 555 556 /* XXX This is for cons.c. */ 557 if (!ISSET(tp->t_state, TS_ISOPEN)) 558 return 0; 559 560 (*linesw[tp->t_line].l_close)(tp, flags); 561 ttyclose(tp); 562 563 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 564 /* 565 * Although we got a last close, the device may still be in 566 * use; e.g. if this was the dialout node, and there are still 567 * processes waiting for carrier on the non-dialout node. 568 */ 569 zs_shutdown(zst); 570 } 571 572 return (0); 573 } 574 575 /* 576 * Read/write zs serial port. 577 */ 578 int 579 zsread(dev, uio, flags) 580 dev_t dev; 581 struct uio *uio; 582 int flags; 583 { 584 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(dev)]; 585 struct tty *tp = zst->zst_tty; 586 587 return ((*linesw[tp->t_line].l_read)(tp, uio, flags)); 588 } 589 590 int 591 zswrite(dev, uio, flags) 592 dev_t dev; 593 struct uio *uio; 594 int flags; 595 { 596 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(dev)]; 597 struct tty *tp = zst->zst_tty; 598 599 return ((*linesw[tp->t_line].l_write)(tp, uio, flags)); 600 } 601 602 int 603 zsioctl(dev, cmd, data, flag, p) 604 dev_t dev; 605 u_long cmd; 606 caddr_t data; 607 int flag; 608 struct proc *p; 609 { 610 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(dev)]; 611 struct zs_chanstate *cs = zst->zst_cs; 612 struct tty *tp = zst->zst_tty; 613 int error; 614 int s; 615 616 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); 617 if (error >= 0) 618 return (error); 619 620 error = ttioctl(tp, cmd, data, flag, p); 621 if (error >= 0) 622 return (error); 623 624 #ifdef ZS_MD_IOCTL 625 error = ZS_MD_IOCTL; 626 if (error >= 0) 627 return (error); 628 #endif /* ZS_MD_IOCTL */ 629 630 error = 0; 631 632 s = splzs(); 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 break; 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 error = ENOTTY; 668 break; 669 } 670 671 splx(s); 672 673 return (error); 674 } 675 676 /* 677 * Start or restart transmission. 678 */ 679 static void 680 zsstart(tp) 681 struct tty *tp; 682 { 683 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(tp->t_dev)]; 684 struct zs_chanstate *cs = zst->zst_cs; 685 int s; 686 687 s = spltty(); 688 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 689 goto out; 690 if (zst->zst_tx_stopped) 691 goto out; 692 693 if (tp->t_outq.c_cc <= tp->t_lowat) { 694 if (ISSET(tp->t_state, TS_ASLEEP)) { 695 CLR(tp->t_state, TS_ASLEEP); 696 wakeup((caddr_t)&tp->t_outq); 697 } 698 selwakeup(&tp->t_wsel); 699 if (tp->t_outq.c_cc == 0) 700 goto out; 701 } 702 703 /* Grab the first contiguous region of buffer space. */ 704 { 705 u_char *tba; 706 int tbc; 707 708 tba = tp->t_outq.c_cf; 709 tbc = ndqb(&tp->t_outq, 0); 710 711 (void) splzs(); 712 713 zst->zst_tba = tba; 714 zst->zst_tbc = tbc; 715 } 716 717 SET(tp->t_state, TS_BUSY); 718 zst->zst_tx_busy = 1; 719 720 /* Enable transmit completion interrupts if necessary. */ 721 if (!ISSET(cs->cs_preg[1], ZSWR1_TIE)) { 722 SET(cs->cs_preg[1], ZSWR1_TIE); 723 cs->cs_creg[1] = cs->cs_preg[1]; 724 zs_write_reg(cs, 1, cs->cs_creg[1]); 725 } 726 727 /* Output the first character of the contiguous buffer. */ 728 { 729 zs_write_data(cs, *zst->zst_tba); 730 zst->zst_tbc--; 731 zst->zst_tba++; 732 } 733 out: 734 splx(s); 735 return; 736 } 737 738 /* 739 * Stop output, e.g., for ^S or output flush. 740 */ 741 void 742 zsstop(tp, flag) 743 struct tty *tp; 744 int flag; 745 { 746 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(tp->t_dev)]; 747 int s; 748 749 s = splzs(); 750 if (ISSET(tp->t_state, TS_BUSY)) { 751 /* Stop transmitting at the next chunk. */ 752 zst->zst_tbc = 0; 753 zst->zst_heldtbc = 0; 754 if (!ISSET(tp->t_state, TS_TTSTOP)) 755 SET(tp->t_state, TS_FLUSH); 756 } 757 splx(s); 758 } 759 760 /* 761 * Set ZS tty parameters from termios. 762 * XXX - Should just copy the whole termios after 763 * making sure all the changes could be done. 764 */ 765 static int 766 zsparam(tp, t) 767 struct tty *tp; 768 struct termios *t; 769 { 770 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(tp->t_dev)]; 771 struct zs_chanstate *cs = zst->zst_cs; 772 int ospeed, cflag; 773 u_char tmp3, tmp4, tmp5, tmp15; 774 int s, error; 775 776 ospeed = t->c_ospeed; 777 cflag = t->c_cflag; 778 779 /* Check requested parameters. */ 780 if (ospeed < 0) 781 return (EINVAL); 782 if (t->c_ispeed && t->c_ispeed != ospeed) 783 return (EINVAL); 784 785 /* 786 * For the console, always force CLOCAL and !HUPCL, so that the port 787 * is always active. 788 */ 789 if (ISSET(zst->zst_swflags, TIOCFLAG_SOFTCAR) || 790 ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 791 SET(cflag, CLOCAL); 792 CLR(cflag, HUPCL); 793 } 794 795 /* 796 * Only whack the UART when params change. 797 * Some callers need to clear tp->t_ospeed 798 * to make sure initialization gets done. 799 */ 800 if (tp->t_ospeed == ospeed && 801 tp->t_cflag == cflag) 802 return (0); 803 804 /* 805 * Call MD functions to deal with changed 806 * clock modes or H/W flow control modes. 807 * The BRG divisor is set now. (reg 12,13) 808 */ 809 error = zs_set_speed(cs, ospeed); 810 if (error) 811 return (error); 812 error = zs_set_modes(cs, cflag); 813 if (error) 814 return (error); 815 816 /* 817 * Block interrupts so that state will not 818 * be altered until we are done setting it up. 819 * 820 * Initial values in cs_preg are set before 821 * our attach routine is called. The master 822 * interrupt enable is handled by zsc.c 823 * 824 */ 825 s = splzs(); 826 827 cs->cs_rr0_mask = cs->cs_rr0_cts | cs->cs_rr0_dcd; 828 tmp15 = cs->cs_preg[15]; 829 #if 1 830 if (ISSET(cs->cs_rr0_mask, ZSRR0_DCD)) 831 SET(tmp15, ZSWR15_DCD_IE); 832 else 833 CLR(tmp15, ZSWR15_DCD_IE); 834 if (ISSET(cs->cs_rr0_mask, ZSRR0_CTS)) 835 SET(tmp15, ZSWR15_CTS_IE); 836 else 837 CLR(tmp15, ZSWR15_CTS_IE); 838 #else 839 SET(tmp15, ZSWR15_DCD_IE | ZSWR15_CTS_IE); 840 #endif 841 cs->cs_preg[15] = tmp15; 842 843 /* Recompute character size bits. */ 844 tmp3 = cs->cs_preg[3]; 845 tmp5 = cs->cs_preg[5]; 846 CLR(tmp3, ZSWR3_RXSIZE); 847 CLR(tmp5, ZSWR5_TXSIZE); 848 switch (ISSET(cflag, CSIZE)) { 849 case CS5: 850 SET(tmp3, ZSWR3_RX_5); 851 SET(tmp5, ZSWR5_TX_5); 852 break; 853 case CS6: 854 SET(tmp3, ZSWR3_RX_6); 855 SET(tmp5, ZSWR5_TX_6); 856 break; 857 case CS7: 858 SET(tmp3, ZSWR3_RX_7); 859 SET(tmp5, ZSWR5_TX_7); 860 break; 861 case CS8: 862 SET(tmp3, ZSWR3_RX_8); 863 SET(tmp5, ZSWR5_TX_8); 864 break; 865 } 866 cs->cs_preg[3] = tmp3; 867 cs->cs_preg[5] = tmp5; 868 869 /* 870 * Recompute the stop bits and parity bits. Note that 871 * zs_set_speed() may have set clock selection bits etc. 872 * in wr4, so those must preserved. 873 */ 874 tmp4 = cs->cs_preg[4]; 875 CLR(tmp4, ZSWR4_SBMASK | ZSWR4_PARMASK); 876 if (ISSET(cflag, CSTOPB)) 877 SET(tmp4, ZSWR4_TWOSB); 878 else 879 SET(tmp4, ZSWR4_ONESB); 880 if (!ISSET(cflag, PARODD)) 881 SET(tmp4, ZSWR4_EVENP); 882 if (ISSET(cflag, PARENB)) 883 SET(tmp4, ZSWR4_PARENB); 884 cs->cs_preg[4] = tmp4; 885 886 /* And copy to tty. */ 887 tp->t_ispeed = 0; 888 tp->t_ospeed = ospeed; 889 tp->t_cflag = cflag; 890 891 /* 892 * If nothing is being transmitted, set up new current values, 893 * else mark them as pending. 894 */ 895 if (!cs->cs_heldchange) { 896 if (zst->zst_tx_busy) { 897 zst->zst_heldtbc = zst->zst_tbc; 898 zst->zst_tbc = 0; 899 cs->cs_heldchange = 1; 900 } else 901 zs_loadchannelregs(cs); 902 } 903 904 if (!ISSET(cflag, CHWFLOW)) { 905 /* Disable the high water mark. */ 906 zst->zst_r_hiwat = 0; 907 zst->zst_r_lowat = 0; 908 if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 909 CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 910 zst->zst_rx_ready = 1; 911 cs->cs_softreq = 1; 912 } 913 if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 914 CLR(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 915 zs_hwiflow(zst); 916 } 917 } else { 918 zst->zst_r_hiwat = zstty_rbuf_hiwat; 919 zst->zst_r_lowat = zstty_rbuf_lowat; 920 } 921 922 splx(s); 923 924 /* 925 * Update the tty layer's idea of the carrier bit, in case we changed 926 * CLOCAL or MDMBUF. We don't hang up here; we only do that by 927 * explicit request. Do this only if we have enabled interrupts on 928 * this pin. mac68k and macppc serial ports might have a clock on 929 * DCD, and so it makes no sense to pass the clock state further up 930 * the tty system. 931 */ 932 if (ISSET(cs->cs_rr0_mask, ZSRR0_DCD)) { 933 (void) (*linesw[tp->t_line].l_modem)(tp, 934 ISSET(cs->cs_rr0, ZSRR0_DCD)); 935 } 936 937 if (!ISSET(cflag, CHWFLOW)) { 938 if (zst->zst_tx_stopped) { 939 zst->zst_tx_stopped = 0; 940 zsstart(tp); 941 } 942 } 943 944 return (0); 945 } 946 947 /* 948 * Raise or lower modem control (DTR/RTS) signals. If a character is 949 * in transmission, the change is deferred. 950 */ 951 static void 952 zs_modem(zst, onoff) 953 struct zstty_softc *zst; 954 int onoff; 955 { 956 struct zs_chanstate *cs = zst->zst_cs; 957 958 if (cs->cs_wr5_dtr == 0) 959 return; 960 961 if (onoff) 962 SET(cs->cs_preg[5], cs->cs_wr5_dtr); 963 else 964 CLR(cs->cs_preg[5], cs->cs_wr5_dtr); 965 966 if (!cs->cs_heldchange) { 967 if (zst->zst_tx_busy) { 968 zst->zst_heldtbc = zst->zst_tbc; 969 zst->zst_tbc = 0; 970 cs->cs_heldchange = 1; 971 } else 972 zs_loadchannelregs(cs); 973 } 974 } 975 976 /* 977 * Try to block or unblock input using hardware flow-control. 978 * This is called by kern/tty.c if MDMBUF|CRTSCTS is set, and 979 * if this function returns non-zero, the TS_TBLOCK flag will 980 * be set or cleared according to the "block" arg passed. 981 */ 982 int 983 zshwiflow(tp, block) 984 struct tty *tp; 985 int block; 986 { 987 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(tp->t_dev)]; 988 struct zs_chanstate *cs = zst->zst_cs; 989 int s; 990 991 if (cs->cs_wr5_rts == 0) 992 return (0); 993 994 s = splzs(); 995 if (block) { 996 if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 997 SET(zst->zst_rx_flags, RX_TTY_BLOCKED); 998 zs_hwiflow(zst); 999 } 1000 } else { 1001 if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1002 CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1003 zst->zst_rx_ready = 1; 1004 cs->cs_softreq = 1; 1005 } 1006 if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1007 CLR(zst->zst_rx_flags, RX_TTY_BLOCKED); 1008 zs_hwiflow(zst); 1009 } 1010 } 1011 splx(s); 1012 return (1); 1013 } 1014 1015 /* 1016 * Internal version of zshwiflow 1017 * called at splzs 1018 */ 1019 static void 1020 zs_hwiflow(zst) 1021 struct zstty_softc *zst; 1022 { 1023 struct zs_chanstate *cs = zst->zst_cs; 1024 1025 if (cs->cs_wr5_rts == 0) 1026 return; 1027 1028 if (ISSET(zst->zst_rx_flags, RX_ANY_BLOCK)) { 1029 CLR(cs->cs_preg[5], cs->cs_wr5_rts); 1030 CLR(cs->cs_creg[5], cs->cs_wr5_rts); 1031 } else { 1032 SET(cs->cs_preg[5], cs->cs_wr5_rts); 1033 SET(cs->cs_creg[5], cs->cs_wr5_rts); 1034 } 1035 zs_write_reg(cs, 5, cs->cs_creg[5]); 1036 } 1037 1038 1039 /**************************************************************** 1040 * Interface to the lower layer (zscc) 1041 ****************************************************************/ 1042 1043 static void zstty_rxint __P((struct zs_chanstate *)); 1044 static void zstty_txint __P((struct zs_chanstate *)); 1045 static void zstty_stint __P((struct zs_chanstate *)); 1046 1047 #define integrate static inline 1048 static void zstty_softint __P((struct zs_chanstate *)); 1049 integrate void zstty_rxsoft __P((struct zstty_softc *, struct tty *)); 1050 integrate void zstty_txsoft __P((struct zstty_softc *, struct tty *)); 1051 integrate void zstty_stsoft __P((struct zstty_softc *, struct tty *)); 1052 static void zstty_diag __P((void *)); 1053 1054 /* 1055 * receiver ready interrupt. 1056 * called at splzs 1057 */ 1058 static void 1059 zstty_rxint(cs) 1060 struct zs_chanstate *cs; 1061 { 1062 struct zstty_softc *zst = cs->cs_private; 1063 u_char *put, *end; 1064 u_int cc; 1065 u_char rr0, rr1, c; 1066 1067 end = zst->zst_ebuf; 1068 put = zst->zst_rbput; 1069 cc = zst->zst_rbavail; 1070 1071 while (cc > 0) { 1072 /* 1073 * First read the status, because reading the received char 1074 * destroys the status of this char. 1075 */ 1076 rr1 = zs_read_reg(cs, 1); 1077 c = zs_read_data(cs); 1078 1079 if (ISSET(rr1, ZSRR1_FE | ZSRR1_DO | ZSRR1_PE)) { 1080 /* Clear the receive error. */ 1081 zs_write_csr(cs, ZSWR0_RESET_ERRORS); 1082 } 1083 1084 put[0] = c; 1085 put[1] = rr1; 1086 put += 2; 1087 if (put >= end) 1088 put = zst->zst_rbuf; 1089 cc--; 1090 1091 rr0 = zs_read_csr(cs); 1092 if (!ISSET(rr0, ZSRR0_RX_READY)) 1093 break; 1094 } 1095 1096 /* 1097 * Current string of incoming characters ended because 1098 * no more data was available or we ran out of space. 1099 * Schedule a receive event if any data was received. 1100 * If we're out of space, turn off receive interrupts. 1101 */ 1102 zst->zst_rbput = put; 1103 zst->zst_rbavail = cc; 1104 if (!ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1105 zst->zst_rx_ready = 1; 1106 cs->cs_softreq = 1; 1107 } 1108 1109 /* 1110 * See if we are in danger of overflowing a buffer. If 1111 * so, use hardware flow control to ease the pressure. 1112 */ 1113 if (!ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED) && 1114 cc < zst->zst_r_hiwat) { 1115 SET(zst->zst_rx_flags, RX_IBUF_BLOCKED); 1116 zs_hwiflow(zst); 1117 } 1118 1119 /* 1120 * If we're out of space, disable receive interrupts 1121 * until the queue has drained a bit. 1122 */ 1123 if (!cc) { 1124 SET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED); 1125 CLR(cs->cs_preg[1], ZSWR1_RIE); 1126 cs->cs_creg[1] = cs->cs_preg[1]; 1127 zs_write_reg(cs, 1, cs->cs_creg[1]); 1128 } 1129 1130 #if 0 1131 printf("%xH%04d\n", zst->zst_rx_flags, zst->zst_rbavail); 1132 #endif 1133 } 1134 1135 /* 1136 * transmitter ready interrupt. (splzs) 1137 */ 1138 static void 1139 zstty_txint(cs) 1140 struct zs_chanstate *cs; 1141 { 1142 struct zstty_softc *zst = cs->cs_private; 1143 1144 /* 1145 * If we've delayed a parameter change, do it now, and restart 1146 * output. 1147 */ 1148 if (cs->cs_heldchange) { 1149 zs_loadchannelregs(cs); 1150 cs->cs_heldchange = 0; 1151 zst->zst_tbc = zst->zst_heldtbc; 1152 zst->zst_heldtbc = 0; 1153 } 1154 1155 /* Output the next character in the buffer, if any. */ 1156 if (zst->zst_tbc > 0) { 1157 zs_write_data(cs, *zst->zst_tba); 1158 zst->zst_tbc--; 1159 zst->zst_tba++; 1160 } else { 1161 /* Disable transmit completion interrupts if necessary. */ 1162 if (ISSET(cs->cs_preg[1], ZSWR1_TIE)) { 1163 CLR(cs->cs_preg[1], ZSWR1_TIE); 1164 cs->cs_creg[1] = cs->cs_preg[1]; 1165 zs_write_reg(cs, 1, cs->cs_creg[1]); 1166 } 1167 if (zst->zst_tx_busy) { 1168 zst->zst_tx_busy = 0; 1169 zst->zst_tx_done = 1; 1170 cs->cs_softreq = 1; 1171 } 1172 } 1173 } 1174 1175 /* 1176 * status change interrupt. (splzs) 1177 */ 1178 static void 1179 zstty_stint(cs) 1180 struct zs_chanstate *cs; 1181 { 1182 struct zstty_softc *zst = cs->cs_private; 1183 u_char rr0, delta; 1184 1185 rr0 = zs_read_csr(cs); 1186 zs_write_csr(cs, ZSWR0_RESET_STATUS); 1187 1188 /* 1189 * Check here for console break, so that we can abort 1190 * even when interrupts are locking up the machine. 1191 */ 1192 if (ISSET(rr0, ZSRR0_BREAK) && 1193 ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 1194 zs_abort(cs); 1195 return; 1196 } 1197 1198 delta = rr0 ^ cs->cs_rr0; 1199 cs->cs_rr0 = rr0; 1200 if (ISSET(delta, cs->cs_rr0_mask)) { 1201 SET(cs->cs_rr0_delta, delta); 1202 1203 /* 1204 * Stop output immediately if we lose the output 1205 * flow control signal or carrier detect. 1206 */ 1207 if (ISSET(~rr0, cs->cs_rr0_mask)) { 1208 zst->zst_tbc = 0; 1209 zst->zst_heldtbc = 0; 1210 } 1211 1212 zst->zst_st_check = 1; 1213 cs->cs_softreq = 1; 1214 } 1215 } 1216 1217 void 1218 zstty_diag(arg) 1219 void *arg; 1220 { 1221 struct zstty_softc *zst = arg; 1222 int overflows, floods; 1223 int s; 1224 1225 s = splzs(); 1226 overflows = zst->zst_overflows; 1227 zst->zst_overflows = 0; 1228 floods = zst->zst_floods; 1229 zst->zst_floods = 0; 1230 zst->zst_errors = 0; 1231 splx(s); 1232 1233 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1234 zst->zst_dev.dv_xname, 1235 overflows, overflows == 1 ? "" : "s", 1236 floods, floods == 1 ? "" : "s"); 1237 } 1238 1239 integrate void 1240 zstty_rxsoft(zst, tp) 1241 struct zstty_softc *zst; 1242 struct tty *tp; 1243 { 1244 struct zs_chanstate *cs = zst->zst_cs; 1245 int (*rint) __P((int c, struct tty *tp)) = linesw[tp->t_line].l_rint; 1246 u_char *get, *end; 1247 u_int cc, scc; 1248 u_char rr1; 1249 int code; 1250 int s; 1251 1252 end = zst->zst_ebuf; 1253 get = zst->zst_rbget; 1254 scc = cc = zstty_rbuf_size - zst->zst_rbavail; 1255 1256 if (cc == zstty_rbuf_size) { 1257 zst->zst_floods++; 1258 if (zst->zst_errors++ == 0) 1259 timeout(zstty_diag, zst, 60 * hz); 1260 } 1261 1262 while (cc) { 1263 code = get[0]; 1264 rr1 = get[1]; 1265 if (ISSET(rr1, ZSRR1_DO | ZSRR1_FE | ZSRR1_PE)) { 1266 if (ISSET(rr1, ZSRR1_DO)) { 1267 zst->zst_overflows++; 1268 if (zst->zst_errors++ == 0) 1269 timeout(zstty_diag, zst, 60 * hz); 1270 } 1271 if (ISSET(rr1, ZSRR1_FE)) 1272 SET(code, TTY_FE); 1273 if (ISSET(rr1, ZSRR1_PE)) 1274 SET(code, TTY_PE); 1275 } 1276 if ((*rint)(code, tp) == -1) { 1277 /* 1278 * The line discipline's buffer is out of space. 1279 */ 1280 if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1281 /* 1282 * We're either not using flow control, or the 1283 * line discipline didn't tell us to block for 1284 * some reason. Either way, we have no way to 1285 * know when there's more space available, so 1286 * just drop the rest of the data. 1287 */ 1288 get += cc << 1; 1289 if (get >= end) 1290 get -= zstty_rbuf_size << 1; 1291 cc = 0; 1292 } else { 1293 /* 1294 * Don't schedule any more receive processing 1295 * until the line discipline tells us there's 1296 * space available (through comhwiflow()). 1297 * Leave the rest of the data in the input 1298 * buffer. 1299 */ 1300 SET(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1301 } 1302 break; 1303 } 1304 get += 2; 1305 if (get >= end) 1306 get = zst->zst_rbuf; 1307 cc--; 1308 } 1309 1310 if (cc != scc) { 1311 zst->zst_rbget = get; 1312 s = splzs(); 1313 cc = zst->zst_rbavail += scc - cc; 1314 /* Buffers should be ok again, release possible block. */ 1315 if (cc >= zst->zst_r_lowat) { 1316 if (ISSET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED)) { 1317 CLR(zst->zst_rx_flags, RX_IBUF_OVERFLOWED); 1318 SET(cs->cs_preg[1], ZSWR1_RIE); 1319 cs->cs_creg[1] = cs->cs_preg[1]; 1320 zs_write_reg(cs, 1, cs->cs_creg[1]); 1321 } 1322 if (ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED)) { 1323 CLR(zst->zst_rx_flags, RX_IBUF_BLOCKED); 1324 zs_hwiflow(zst); 1325 } 1326 } 1327 splx(s); 1328 } 1329 1330 #if 0 1331 printf("%xS%04d\n", zst->zst_rx_flags, zst->zst_rbavail); 1332 #endif 1333 } 1334 1335 integrate void 1336 zstty_txsoft(zst, tp) 1337 struct zstty_softc *zst; 1338 struct tty *tp; 1339 { 1340 1341 CLR(tp->t_state, TS_BUSY); 1342 if (ISSET(tp->t_state, TS_FLUSH)) 1343 CLR(tp->t_state, TS_FLUSH); 1344 else 1345 ndflush(&tp->t_outq, (int)(zst->zst_tba - tp->t_outq.c_cf)); 1346 (*linesw[tp->t_line].l_start)(tp); 1347 } 1348 1349 integrate void 1350 zstty_stsoft(zst, tp) 1351 struct zstty_softc *zst; 1352 struct tty *tp; 1353 { 1354 struct zs_chanstate *cs = zst->zst_cs; 1355 u_char rr0, delta; 1356 int s; 1357 1358 s = splzs(); 1359 rr0 = cs->cs_rr0; 1360 delta = cs->cs_rr0_delta; 1361 cs->cs_rr0_delta = 0; 1362 splx(s); 1363 1364 if (ISSET(delta, cs->cs_rr0_dcd)) { 1365 /* 1366 * Inform the tty layer that carrier detect changed. 1367 */ 1368 (void) (*linesw[tp->t_line].l_modem)(tp, ISSET(rr0, ZSRR0_DCD)); 1369 } 1370 1371 if (ISSET(delta, cs->cs_rr0_cts)) { 1372 /* Block or unblock output according to flow control. */ 1373 if (ISSET(rr0, cs->cs_rr0_cts)) { 1374 zst->zst_tx_stopped = 0; 1375 (*linesw[tp->t_line].l_start)(tp); 1376 } else { 1377 zst->zst_tx_stopped = 1; 1378 } 1379 } 1380 } 1381 1382 /* 1383 * Software interrupt. Called at zssoft 1384 * 1385 * The main job to be done here is to empty the input ring 1386 * by passing its contents up to the tty layer. The ring is 1387 * always emptied during this operation, therefore the ring 1388 * must not be larger than the space after "high water" in 1389 * the tty layer, or the tty layer might drop our input. 1390 * 1391 * Note: an "input blockage" condition is assumed to exist if 1392 * EITHER the TS_TBLOCK flag or zst_rx_blocked flag is set. 1393 */ 1394 static void 1395 zstty_softint(cs) 1396 struct zs_chanstate *cs; 1397 { 1398 struct zstty_softc *zst = cs->cs_private; 1399 struct tty *tp = zst->zst_tty; 1400 int s; 1401 1402 s = spltty(); 1403 1404 if (zst->zst_rx_ready) { 1405 zst->zst_rx_ready = 0; 1406 zstty_rxsoft(zst, tp); 1407 } 1408 1409 if (zst->zst_st_check) { 1410 zst->zst_st_check = 0; 1411 zstty_stsoft(zst, tp); 1412 } 1413 1414 if (zst->zst_tx_done) { 1415 zst->zst_tx_done = 0; 1416 zstty_txsoft(zst, tp); 1417 } 1418 1419 splx(s); 1420 } 1421 1422 struct zsops zsops_tty = { 1423 zstty_rxint, /* receive char available */ 1424 zstty_stint, /* external/status */ 1425 zstty_txint, /* xmit buffer empty */ 1426 zstty_softint, /* process software interrupt */ 1427 }; 1428
Indexes created Sun Sep 28 16:09:52 GMT 2025