z8530tty.c revision 1.49
1 /* $NetBSD: z8530tty.c,v 1.49 1998/08/09 06:17:07 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 "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 */ 129 u_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. */ 132 u_int zstty_rbuf_hiwat = (ZSTTY_RING_SIZE * 1) / 4; 133 u_int zstty_rbuf_lowat = (ZSTTY_RING_SIZE * 3) / 4; 134 135 struct 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 186 static int zstty_match(struct device *, void *, void *); 187 #else 188 static int zstty_match(struct device *, struct cfdata *, void *); 189 #endif 190 static void zstty_attach(struct device *, struct device *, void *); 191 192 struct cfattach zstty_ca = { 193 sizeof(struct zstty_softc), zstty_match, zstty_attach 194 }; 195 196 extern struct cfdriver zstty_cd; 197 198 struct zsops zsops_tty; 199 200 /* Routines called from other code. */ 201 cdev_decl(zs); /* open, close, read, write, ioctl, stop, ... */ 202 203 static void zs_shutdown __P((struct zstty_softc *)); 204 static void zsstart __P((struct tty *)); 205 static int zsparam __P((struct tty *, struct termios *)); 206 static void zs_modem __P((struct zstty_softc *zst, int onoff)); 207 static int zshwiflow __P((struct tty *, int)); 208 static void zs_hwiflow __P((struct zstty_softc *)); 209 210 #define ZSUNIT(x) (minor(x) & 0x7ffff) 211 #define ZSDIALOUT(x) (minor(x) & 0x80000) 212 213 /* 214 * zstty_match: how is this zs channel configured? 215 */ 216 #ifdef __BROKEN_INDIRECT_CONFIG 217 int 218 zstty_match(parent, vcf, aux) 219 struct device *parent; 220 void *vcf, *aux; 221 { 222 struct cfdata *cf = vcf; 223 struct zsc_attach_args *args = aux; 224 225 /* Exact match is better than wildcard. */ 226 if (cf->cf_loc[ZSCCF_CHANNEL] == args->channel) 227 return 2; 228 229 /* This driver accepts wildcard. */ 230 if (cf->cf_loc[ZSCCF_CHANNEL] == ZSCCF_CHANNEL_DEFAULT) 231 return 1; 232 233 return 0; 234 } 235 #else /* __BROKEN_INDIRECT_CONFIG */ 236 int 237 zstty_match(parent, cf, aux) 238 struct device *parent; 239 struct cfdata *cf; 240 void *aux; 241 { 242 struct zsc_attach_args *args = aux; 243 244 /* Exact match is better than wildcard. */ 245 if (cf->cf_loc[ZSCCF_CHANNEL] == args->channel) 246 return 2; 247 248 /* This driver accepts wildcard. */ 249 if (cf->cf_loc[ZSCCF_CHANNEL] == ZSCCF_CHANNEL_DEFAULT) 250 return 1; 251 252 return 0; 253 } 254 #endif /* __BROKEN_INDIRECT_CONFIG */ 255 256 void 257 zstty_attach(parent, self, aux) 258 struct device *parent, *self; 259 void *aux; 260 261 { 262 struct zsc_softc *zsc = (void *) parent; 263 struct zstty_softc *zst = (void *) self; 264 struct cfdata *cf = self->dv_cfdata; 265 struct zsc_attach_args *args = aux; 266 struct zs_chanstate *cs; 267 struct tty *tp; 268 int channel, s, tty_unit; 269 dev_t dev; 270 271 tty_unit = zst->zst_dev.dv_unit; 272 channel = args->channel; 273 cs = zsc->zsc_cs[channel]; 274 cs->cs_private = zst; 275 cs->cs_ops = &zsops_tty; 276 277 zst->zst_cs = cs; 278 zst->zst_swflags = cf->cf_flags; /* softcar, etc. */ 279 zst->zst_hwflags = args->hwflags; 280 dev = makedev(zs_major, tty_unit); 281 282 if (zst->zst_swflags) 283 printf(" flags 0x%x", zst->zst_swflags); 284 285 if (ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) 286 printf(" (console)"); 287 else { 288 #ifdef KGDB 289 /* 290 * Allow kgdb to "take over" this port. Returns true 291 * if this serial port is in-use by kgdb. 292 */ 293 if (zs_check_kgdb(cs, dev)) { 294 printf(" (kgdb)\n"); 295 /* 296 * This is the kgdb port (exclusive use) 297 * so skip the normal attach code. 298 */ 299 return; 300 } 301 #endif 302 } 303 printf("\n"); 304 305 tp = ttymalloc(); 306 tp->t_dev = dev; 307 tp->t_oproc = zsstart; 308 tp->t_param = zsparam; 309 tp->t_hwiflow = zshwiflow; 310 tty_attach(tp); 311 312 zst->zst_tty = tp; 313 zst->zst_rbuf = malloc(zstty_rbuf_size << 1, M_DEVBUF, M_WAITOK); 314 zst->zst_ebuf = zst->zst_rbuf + (zstty_rbuf_size << 1); 315 /* Disable the high water mark. */ 316 zst->zst_r_hiwat = 0; 317 zst->zst_r_lowat = 0; 318 zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf; 319 zst->zst_rbavail = zstty_rbuf_size; 320 321 /* XXX - Do we need an MD hook here? */ 322 323 /* 324 * Hardware init 325 */ 326 if (ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 327 /* Call zsparam similar to open. */ 328 struct termios t; 329 330 s = splzs(); 331 332 /* Turn on interrupts. */ 333 cs->cs_creg[1] = cs->cs_preg[1] = ZSWR1_RIE | ZSWR1_SIE; 334 zs_write_reg(cs, 1, cs->cs_creg[1]); 335 336 /* Fetch the current modem control status, needed later. */ 337 cs->cs_rr0 = zs_read_csr(cs); 338 339 splx(s); 340 341 /* Setup the "new" parameters in t. */ 342 t.c_ispeed = 0; 343 t.c_ospeed = cs->cs_defspeed; 344 t.c_cflag = cs->cs_defcflag; 345 /* Make sure zsparam will see changes. */ 346 tp->t_ospeed = 0; 347 (void) zsparam(tp, &t); 348 349 s = splzs(); 350 351 /* Make sure DTR is on now. */ 352 zs_modem(zst, 1); 353 354 splx(s); 355 } else { 356 /* Not the console; may need reset. */ 357 int reset; 358 359 reset = (channel == 0) ? ZSWR9_A_RESET : ZSWR9_B_RESET; 360 361 s = splzs(); 362 363 zs_write_reg(cs, 9, reset); 364 365 /* Will raise DTR in open. */ 366 zs_modem(zst, 0); 367 368 splx(s); 369 } 370 } 371 372 373 /* 374 * Return pointer to our tty. 375 */ 376 struct tty * 377 zstty(dev) 378 dev_t dev; 379 { 380 struct zstty_softc *zst; 381 int unit = ZSUNIT(dev); 382 383 #ifdef DIAGNOSTIC 384 if (unit >= zstty_cd.cd_ndevs) 385 panic("zstty"); 386 #endif 387 zst = zstty_cd.cd_devs[unit]; 388 return (zst->zst_tty); 389 } 390 391 392 void 393 zs_shutdown(zst) 394 struct zstty_softc *zst; 395 { 396 struct zs_chanstate *cs = zst->zst_cs; 397 struct tty *tp = zst->zst_tty; 398 int s; 399 400 s = splzs(); 401 402 /* If we were asserting flow control, then deassert it. */ 403 SET(zst->zst_rx_flags, RX_IBUF_BLOCKED); 404 zs_hwiflow(zst); 405 406 /* Clear any break condition set with TIOCSBRK. */ 407 zs_break(cs, 0); 408 409 /* 410 * Hang up if necessary. Wait a bit, so the other side has time to 411 * notice even if we immediately open the port again. 412 */ 413 if (ISSET(tp->t_cflag, HUPCL)) { 414 zs_modem(zst, 0); 415 (void) tsleep(cs, TTIPRI, ttclos, hz); 416 } 417 418 /* Turn off interrupts if not the console. */ 419 if (ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) 420 cs->cs_creg[1] = cs->cs_preg[1] = ZSWR1_RIE | ZSWR1_SIE; 421 else 422 cs->cs_creg[1] = cs->cs_preg[1] = 0; 423 zs_write_reg(cs, 1, cs->cs_creg[1]); 424 425 splx(s); 426 } 427 428 /* 429 * Open a zs serial (tty) port. 430 */ 431 int 432 zsopen(dev, flags, mode, p) 433 dev_t dev; 434 int flags; 435 int mode; 436 struct proc *p; 437 { 438 int unit = ZSUNIT(dev); 439 struct zstty_softc *zst; 440 struct zs_chanstate *cs; 441 struct tty *tp; 442 int s, s2; 443 int error; 444 445 if (unit >= zstty_cd.cd_ndevs) 446 return (ENXIO); 447 zst = zstty_cd.cd_devs[unit]; 448 if (zst == 0) 449 return (ENXIO); 450 tp = zst->zst_tty; 451 cs = zst->zst_cs; 452 453 /* If KGDB took the line, then tp==NULL */ 454 if (tp == NULL) 455 return (EBUSY); 456 457 if (ISSET(tp->t_state, TS_ISOPEN) && 458 ISSET(tp->t_state, TS_XCLUDE) && 459 p->p_ucred->cr_uid != 0) 460 return (EBUSY); 461 462 s = spltty(); 463 464 /* 465 * Do the following iff this is a first open. 466 */ 467 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 468 struct termios t; 469 470 s2 = splzs(); 471 472 /* Turn on interrupts. */ 473 cs->cs_creg[1] = cs->cs_preg[1] = ZSWR1_RIE | ZSWR1_SIE; 474 zs_write_reg(cs, 1, cs->cs_creg[1]); 475 476 /* Fetch the current modem control status, needed later. */ 477 cs->cs_rr0 = zs_read_csr(cs); 478 479 splx(s2); 480 481 /* 482 * Initialize the termios status to the defaults. Add in the 483 * sticky bits from TIOCSFLAGS. 484 */ 485 t.c_ispeed = 0; 486 t.c_ospeed = cs->cs_defspeed; 487 t.c_cflag = cs->cs_defcflag; 488 if (ISSET(zst->zst_swflags, TIOCFLAG_CLOCAL)) 489 SET(t.c_cflag, CLOCAL); 490 if (ISSET(zst->zst_swflags, TIOCFLAG_CRTSCTS)) 491 SET(t.c_cflag, CRTSCTS); 492 if (ISSET(zst->zst_swflags, TIOCFLAG_CDTRCTS)) 493 SET(t.c_cflag, CDTRCTS); 494 if (ISSET(zst->zst_swflags, TIOCFLAG_MDMBUF)) 495 SET(t.c_cflag, MDMBUF); 496 /* Make sure zsparam will see changes. */ 497 tp->t_ospeed = 0; 498 (void) zsparam(tp, &t); 499 /* 500 * Note: zsparam has done: cflag, ispeed, ospeed 501 * so we just need to do: iflag, oflag, lflag, cc 502 * For "raw" mode, just leave all zeros. 503 */ 504 if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_RAW)) { 505 tp->t_iflag = TTYDEF_IFLAG; 506 tp->t_oflag = TTYDEF_OFLAG; 507 tp->t_lflag = TTYDEF_LFLAG; 508 } else { 509 tp->t_iflag = 0; 510 tp->t_oflag = 0; 511 tp->t_lflag = 0; 512 } 513 ttychars(tp); 514 ttsetwater(tp); 515 516 s2 = splzs(); 517 518 /* 519 * Turn on DTR. We must always do this, even if carrier is not 520 * present, because otherwise we'd have to use TIOCSDTR 521 * immediately after setting CLOCAL, which applications do not 522 * expect. We always assert DTR while the device is open 523 * unless explicitly requested to deassert it. 524 */ 525 zs_modem(zst, 1); 526 527 /* Clear the input ring, and unblock. */ 528 zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf; 529 zst->zst_rbavail = zstty_rbuf_size; 530 zs_iflush(cs); 531 CLR(zst->zst_rx_flags, RX_ANY_BLOCK); 532 zs_hwiflow(zst); 533 534 splx(s2); 535 } 536 537 splx(s); 538 539 error = ttyopen(tp, ZSDIALOUT(dev), ISSET(flags, O_NONBLOCK)); 540 if (error) 541 goto bad; 542 543 error = (*linesw[tp->t_line].l_open)(dev, tp); 544 if (error) 545 goto bad; 546 547 return (0); 548 549 bad: 550 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 551 /* 552 * We failed to open the device, and nobody else had it opened. 553 * Clean up the state as appropriate. 554 */ 555 zs_shutdown(zst); 556 } 557 558 return (error); 559 } 560 561 /* 562 * Close a zs serial port. 563 */ 564 int 565 zsclose(dev, flags, mode, p) 566 dev_t dev; 567 int flags; 568 int mode; 569 struct proc *p; 570 { 571 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(dev)]; 572 struct tty *tp = zst->zst_tty; 573 574 /* XXX This is for cons.c. */ 575 if (!ISSET(tp->t_state, TS_ISOPEN)) 576 return 0; 577 578 (*linesw[tp->t_line].l_close)(tp, flags); 579 ttyclose(tp); 580 581 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 582 /* 583 * Although we got a last close, the device may still be in 584 * use; e.g. if this was the dialout node, and there are still 585 * processes waiting for carrier on the non-dialout node. 586 */ 587 zs_shutdown(zst); 588 } 589 590 return (0); 591 } 592 593 /* 594 * Read/write zs serial port. 595 */ 596 int 597 zsread(dev, uio, flags) 598 dev_t dev; 599 struct uio *uio; 600 int flags; 601 { 602 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(dev)]; 603 struct tty *tp = zst->zst_tty; 604 605 return ((*linesw[tp->t_line].l_read)(tp, uio, flags)); 606 } 607 608 int 609 zswrite(dev, uio, flags) 610 dev_t dev; 611 struct uio *uio; 612 int flags; 613 { 614 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(dev)]; 615 struct tty *tp = zst->zst_tty; 616 617 return ((*linesw[tp->t_line].l_write)(tp, uio, flags)); 618 } 619 620 int 621 zsioctl(dev, cmd, data, flag, p) 622 dev_t dev; 623 u_long cmd; 624 caddr_t data; 625 int flag; 626 struct proc *p; 627 { 628 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(dev)]; 629 struct zs_chanstate *cs = zst->zst_cs; 630 struct tty *tp = zst->zst_tty; 631 int error; 632 int s; 633 634 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); 635 if (error >= 0) 636 return (error); 637 638 error = ttioctl(tp, cmd, data, flag, p); 639 if (error >= 0) 640 return (error); 641 642 #ifdef ZS_MD_IOCTL 643 error = ZS_MD_IOCTL; 644 if (error >= 0) 645 return (error); 646 #endif /* ZS_MD_IOCTL */ 647 648 error = 0; 649 650 s = splzs(); 651 652 switch (cmd) { 653 case TIOCSBRK: 654 zs_break(cs, 1); 655 break; 656 657 case TIOCCBRK: 658 zs_break(cs, 0); 659 break; 660 661 case TIOCGFLAGS: 662 *(int *)data = zst->zst_swflags; 663 break; 664 665 case TIOCSFLAGS: 666 error = suser(p->p_ucred, &p->p_acflag); 667 if (error) 668 break; 669 zst->zst_swflags = *(int *)data; 670 break; 671 672 case TIOCSDTR: 673 zs_modem(zst, 1); 674 break; 675 676 case TIOCCDTR: 677 zs_modem(zst, 0); 678 break; 679 680 case TIOCMSET: 681 case TIOCMBIS: 682 case TIOCMBIC: 683 case TIOCMGET: 684 default: 685 error = ENOTTY; 686 break; 687 } 688 689 splx(s); 690 691 return (error); 692 } 693 694 /* 695 * Start or restart transmission. 696 */ 697 static void 698 zsstart(tp) 699 struct tty *tp; 700 { 701 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(tp->t_dev)]; 702 struct zs_chanstate *cs = zst->zst_cs; 703 int s; 704 705 s = spltty(); 706 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 707 goto out; 708 if (zst->zst_tx_stopped) 709 goto out; 710 711 if (tp->t_outq.c_cc <= tp->t_lowat) { 712 if (ISSET(tp->t_state, TS_ASLEEP)) { 713 CLR(tp->t_state, TS_ASLEEP); 714 wakeup((caddr_t)&tp->t_outq); 715 } 716 selwakeup(&tp->t_wsel); 717 if (tp->t_outq.c_cc == 0) 718 goto out; 719 } 720 721 /* Grab the first contiguous region of buffer space. */ 722 { 723 u_char *tba; 724 int tbc; 725 726 tba = tp->t_outq.c_cf; 727 tbc = ndqb(&tp->t_outq, 0); 728 729 (void) splzs(); 730 731 zst->zst_tba = tba; 732 zst->zst_tbc = tbc; 733 } 734 735 SET(tp->t_state, TS_BUSY); 736 zst->zst_tx_busy = 1; 737 738 /* Enable transmit completion interrupts if necessary. */ 739 if (!ISSET(cs->cs_preg[1], ZSWR1_TIE)) { 740 SET(cs->cs_preg[1], ZSWR1_TIE); 741 cs->cs_creg[1] = cs->cs_preg[1]; 742 zs_write_reg(cs, 1, cs->cs_creg[1]); 743 } 744 745 /* Output the first character of the contiguous buffer. */ 746 { 747 zs_write_data(cs, *zst->zst_tba); 748 zst->zst_tbc--; 749 zst->zst_tba++; 750 } 751 out: 752 splx(s); 753 return; 754 } 755 756 /* 757 * Stop output, e.g., for ^S or output flush. 758 */ 759 void 760 zsstop(tp, flag) 761 struct tty *tp; 762 int flag; 763 { 764 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(tp->t_dev)]; 765 int s; 766 767 s = splzs(); 768 if (ISSET(tp->t_state, TS_BUSY)) { 769 /* Stop transmitting at the next chunk. */ 770 zst->zst_tbc = 0; 771 zst->zst_heldtbc = 0; 772 if (!ISSET(tp->t_state, TS_TTSTOP)) 773 SET(tp->t_state, TS_FLUSH); 774 } 775 splx(s); 776 } 777 778 /* 779 * Set ZS tty parameters from termios. 780 * XXX - Should just copy the whole termios after 781 * making sure all the changes could be done. 782 */ 783 static int 784 zsparam(tp, t) 785 struct tty *tp; 786 struct termios *t; 787 { 788 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(tp->t_dev)]; 789 struct zs_chanstate *cs = zst->zst_cs; 790 int ospeed, cflag; 791 u_char tmp3, tmp4, tmp5, tmp15; 792 int s, error; 793 794 ospeed = t->c_ospeed; 795 cflag = t->c_cflag; 796 797 /* Check requested parameters. */ 798 if (ospeed < 0) 799 return (EINVAL); 800 if (t->c_ispeed && t->c_ispeed != ospeed) 801 return (EINVAL); 802 803 /* 804 * For the console, always force CLOCAL and !HUPCL, so that the port 805 * is always active. 806 */ 807 if (ISSET(zst->zst_swflags, TIOCFLAG_SOFTCAR) || 808 ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 809 SET(cflag, CLOCAL); 810 CLR(cflag, HUPCL); 811 } 812 813 /* 814 * Only whack the UART when params change. 815 * Some callers need to clear tp->t_ospeed 816 * to make sure initialization gets done. 817 */ 818 if (tp->t_ospeed == ospeed && 819 tp->t_cflag == cflag) 820 return (0); 821 822 /* 823 * Call MD functions to deal with changed 824 * clock modes or H/W flow control modes. 825 * The BRG divisor is set now. (reg 12,13) 826 */ 827 error = zs_set_speed(cs, ospeed); 828 if (error) 829 return (error); 830 error = zs_set_modes(cs, cflag); 831 if (error) 832 return (error); 833 834 /* 835 * Block interrupts so that state will not 836 * be altered until we are done setting it up. 837 * 838 * Initial values in cs_preg are set before 839 * our attach routine is called. The master 840 * interrupt enable is handled by zsc.c 841 * 842 */ 843 s = splzs(); 844 845 cs->cs_rr0_mask = cs->cs_rr0_cts | cs->cs_rr0_dcd; 846 tmp15 = cs->cs_preg[15]; 847 #if 0 848 if (ISSET(cs->cs_rr0_mask, ZSRR0_DCD)) 849 SET(tmp15, ZSWR15_DCD_IE); 850 else 851 CLR(tmp15, ZSWR15_DCD_IE); 852 if (ISSET(cs->cs_rr0_mask, ZSRR0_CTS)) 853 SET(tmp15, ZSWR15_CTS_IE); 854 else 855 CLR(tmp15, ZSWR15_CTS_IE); 856 #else 857 SET(tmp15, ZSWR15_DCD_IE | ZSWR15_CTS_IE); 858 #endif 859 cs->cs_preg[15] = tmp15; 860 861 /* Recompute character size bits. */ 862 tmp3 = cs->cs_preg[3]; 863 tmp5 = cs->cs_preg[5]; 864 CLR(tmp3, ZSWR3_RXSIZE); 865 CLR(tmp5, ZSWR5_TXSIZE); 866 switch (ISSET(cflag, CSIZE)) { 867 case CS5: 868 SET(tmp3, ZSWR3_RX_5); 869 SET(tmp5, ZSWR5_TX_5); 870 break; 871 case CS6: 872 SET(tmp3, ZSWR3_RX_6); 873 SET(tmp5, ZSWR5_TX_6); 874 break; 875 case CS7: 876 SET(tmp3, ZSWR3_RX_7); 877 SET(tmp5, ZSWR5_TX_7); 878 break; 879 case CS8: 880 SET(tmp3, ZSWR3_RX_8); 881 SET(tmp5, ZSWR5_TX_8); 882 break; 883 } 884 cs->cs_preg[3] = tmp3; 885 cs->cs_preg[5] = tmp5; 886 887 /* 888 * Recompute the stop bits and parity bits. Note that 889 * zs_set_speed() may have set clock selection bits etc. 890 * in wr4, so those must preserved. 891 */ 892 tmp4 = cs->cs_preg[4]; 893 CLR(tmp4, ZSWR4_SBMASK | ZSWR4_PARMASK); 894 if (ISSET(cflag, CSTOPB)) 895 SET(tmp4, ZSWR4_TWOSB); 896 else 897 SET(tmp4, ZSWR4_ONESB); 898 if (!ISSET(cflag, PARODD)) 899 SET(tmp4, ZSWR4_EVENP); 900 if (ISSET(cflag, PARENB)) 901 SET(tmp4, ZSWR4_PARENB); 902 cs->cs_preg[4] = tmp4; 903 904 /* And copy to tty. */ 905 tp->t_ispeed = 0; 906 tp->t_ospeed = ospeed; 907 tp->t_cflag = cflag; 908 909 /* 910 * If nothing is being transmitted, set up new current values, 911 * else mark them as pending. 912 */ 913 if (!cs->cs_heldchange) { 914 if (zst->zst_tx_busy) { 915 zst->zst_heldtbc = zst->zst_tbc; 916 zst->zst_tbc = 0; 917 cs->cs_heldchange = 1; 918 } else 919 zs_loadchannelregs(cs); 920 } 921 922 if (!ISSET(cflag, CHWFLOW)) { 923 /* Disable the high water mark. */ 924 zst->zst_r_hiwat = 0; 925 zst->zst_r_lowat = 0; 926 if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 927 CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 928 zst->zst_rx_ready = 1; 929 cs->cs_softreq = 1; 930 } 931 if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 932 CLR(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 933 zs_hwiflow(zst); 934 } 935 } else { 936 zst->zst_r_hiwat = zstty_rbuf_hiwat; 937 zst->zst_r_lowat = zstty_rbuf_lowat; 938 } 939 940 splx(s); 941 942 /* 943 * Update the tty layer's idea of the carrier bit, in case we changed 944 * CLOCAL or MDMBUF. We don't hang up here; we only do that by 945 * explicit request. 946 */ 947 (void) (*linesw[tp->t_line].l_modem)(tp, ISSET(cs->cs_rr0, ZSRR0_DCD)); 948 949 if (!ISSET(cflag, CHWFLOW)) { 950 if (zst->zst_tx_stopped) { 951 zst->zst_tx_stopped = 0; 952 zsstart(tp); 953 } 954 } 955 956 return (0); 957 } 958 959 /* 960 * Raise or lower modem control (DTR/RTS) signals. If a character is 961 * in transmission, the change is deferred. 962 */ 963 static void 964 zs_modem(zst, onoff) 965 struct zstty_softc *zst; 966 int onoff; 967 { 968 struct zs_chanstate *cs = zst->zst_cs; 969 970 if (cs->cs_wr5_dtr == 0) 971 return; 972 973 if (onoff) 974 SET(cs->cs_preg[5], cs->cs_wr5_dtr); 975 else 976 CLR(cs->cs_preg[5], cs->cs_wr5_dtr); 977 978 if (!cs->cs_heldchange) { 979 if (zst->zst_tx_busy) { 980 zst->zst_heldtbc = zst->zst_tbc; 981 zst->zst_tbc = 0; 982 cs->cs_heldchange = 1; 983 } else 984 zs_loadchannelregs(cs); 985 } 986 } 987 988 /* 989 * Try to block or unblock input using hardware flow-control. 990 * This is called by kern/tty.c if MDMBUF|CRTSCTS is set, and 991 * if this function returns non-zero, the TS_TBLOCK flag will 992 * be set or cleared according to the "block" arg passed. 993 */ 994 int 995 zshwiflow(tp, block) 996 struct tty *tp; 997 int block; 998 { 999 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(tp->t_dev)]; 1000 struct zs_chanstate *cs = zst->zst_cs; 1001 int s; 1002 1003 if (cs->cs_wr5_rts == 0) 1004 return (0); 1005 1006 s = splzs(); 1007 if (block) { 1008 if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1009 SET(zst->zst_rx_flags, RX_TTY_BLOCKED); 1010 zs_hwiflow(zst); 1011 } 1012 } else { 1013 if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1014 CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1015 zst->zst_rx_ready = 1; 1016 cs->cs_softreq = 1; 1017 } 1018 if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1019 CLR(zst->zst_rx_flags, RX_TTY_BLOCKED); 1020 zs_hwiflow(zst); 1021 } 1022 } 1023 splx(s); 1024 return (1); 1025 } 1026 1027 /* 1028 * Internal version of zshwiflow 1029 * called at splzs 1030 */ 1031 static void 1032 zs_hwiflow(zst) 1033 struct zstty_softc *zst; 1034 { 1035 struct zs_chanstate *cs = zst->zst_cs; 1036 1037 if (cs->cs_wr5_rts == 0) 1038 return; 1039 1040 if (ISSET(zst->zst_rx_flags, RX_ANY_BLOCK)) { 1041 CLR(cs->cs_preg[5], cs->cs_wr5_rts); 1042 CLR(cs->cs_creg[5], cs->cs_wr5_rts); 1043 } else { 1044 SET(cs->cs_preg[5], cs->cs_wr5_rts); 1045 SET(cs->cs_creg[5], cs->cs_wr5_rts); 1046 } 1047 zs_write_reg(cs, 5, cs->cs_creg[5]); 1048 } 1049 1050 1051 /**************************************************************** 1052 * Interface to the lower layer (zscc) 1053 ****************************************************************/ 1054 1055 static void zstty_rxint __P((struct zs_chanstate *)); 1056 static void zstty_txint __P((struct zs_chanstate *)); 1057 static void zstty_stint __P((struct zs_chanstate *)); 1058 1059 #define integrate static inline 1060 static void zstty_softint __P((struct zs_chanstate *)); 1061 integrate void zstty_rxsoft __P((struct zstty_softc *, struct tty *)); 1062 integrate void zstty_txsoft __P((struct zstty_softc *, struct tty *)); 1063 integrate void zstty_stsoft __P((struct zstty_softc *, struct tty *)); 1064 static void zstty_diag __P((void *)); 1065 1066 /* 1067 * receiver ready interrupt. 1068 * called at splzs 1069 */ 1070 static void 1071 zstty_rxint(cs) 1072 struct zs_chanstate *cs; 1073 { 1074 struct zstty_softc *zst = cs->cs_private; 1075 u_char *put, *end; 1076 u_int cc; 1077 u_char rr0, rr1, c; 1078 1079 end = zst->zst_ebuf; 1080 put = zst->zst_rbput; 1081 cc = zst->zst_rbavail; 1082 1083 while (cc > 0) { 1084 /* 1085 * First read the status, because reading the received char 1086 * destroys the status of this char. 1087 */ 1088 rr1 = zs_read_reg(cs, 1); 1089 c = zs_read_data(cs); 1090 1091 if (ISSET(rr1, ZSRR1_FE | ZSRR1_DO | ZSRR1_PE)) { 1092 /* Clear the receive error. */ 1093 zs_write_csr(cs, ZSWR0_RESET_ERRORS); 1094 } 1095 1096 put[0] = c; 1097 put[1] = rr1; 1098 put += 2; 1099 if (put >= end) 1100 put = zst->zst_rbuf; 1101 cc--; 1102 1103 rr0 = zs_read_csr(cs); 1104 if (!ISSET(rr0, ZSRR0_RX_READY)) 1105 break; 1106 } 1107 1108 /* 1109 * Current string of incoming characters ended because 1110 * no more data was available or we ran out of space. 1111 * Schedule a receive event if any data was received. 1112 * If we're out of space, turn off receive interrupts. 1113 */ 1114 zst->zst_rbput = put; 1115 zst->zst_rbavail = cc; 1116 if (!ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1117 zst->zst_rx_ready = 1; 1118 cs->cs_softreq = 1; 1119 } 1120 1121 /* 1122 * See if we are in danger of overflowing a buffer. If 1123 * so, use hardware flow control to ease the pressure. 1124 */ 1125 if (!ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED) && 1126 cc < zst->zst_r_hiwat) { 1127 SET(zst->zst_rx_flags, RX_IBUF_BLOCKED); 1128 zs_hwiflow(zst); 1129 } 1130 1131 /* 1132 * If we're out of space, disable receive interrupts 1133 * until the queue has drained a bit. 1134 */ 1135 if (!cc) { 1136 SET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED); 1137 CLR(cs->cs_preg[1], ZSWR1_RIE); 1138 cs->cs_creg[1] = cs->cs_preg[1]; 1139 zs_write_reg(cs, 1, cs->cs_creg[1]); 1140 } 1141 1142 #if 0 1143 printf("%xH%04d\n", zst->zst_rx_flags, zst->zst_rbavail); 1144 #endif 1145 } 1146 1147 /* 1148 * transmitter ready interrupt. (splzs) 1149 */ 1150 static void 1151 zstty_txint(cs) 1152 struct zs_chanstate *cs; 1153 { 1154 struct zstty_softc *zst = cs->cs_private; 1155 1156 /* 1157 * If we've delayed a parameter change, do it now, and restart 1158 * output. 1159 */ 1160 if (cs->cs_heldchange) { 1161 zs_loadchannelregs(cs); 1162 cs->cs_heldchange = 0; 1163 zst->zst_tbc = zst->zst_heldtbc; 1164 zst->zst_heldtbc = 0; 1165 } 1166 1167 /* Output the next character in the buffer, if any. */ 1168 if (zst->zst_tbc > 0) { 1169 zs_write_data(cs, *zst->zst_tba); 1170 zst->zst_tbc--; 1171 zst->zst_tba++; 1172 } else { 1173 /* Disable transmit completion interrupts if necessary. */ 1174 if (ISSET(cs->cs_preg[1], ZSWR1_TIE)) { 1175 CLR(cs->cs_preg[1], ZSWR1_TIE); 1176 cs->cs_creg[1] = cs->cs_preg[1]; 1177 zs_write_reg(cs, 1, cs->cs_creg[1]); 1178 } 1179 if (zst->zst_tx_busy) { 1180 zst->zst_tx_busy = 0; 1181 zst->zst_tx_done = 1; 1182 cs->cs_softreq = 1; 1183 } 1184 } 1185 } 1186 1187 /* 1188 * status change interrupt. (splzs) 1189 */ 1190 static void 1191 zstty_stint(cs) 1192 struct zs_chanstate *cs; 1193 { 1194 struct zstty_softc *zst = cs->cs_private; 1195 u_char rr0, delta; 1196 1197 rr0 = zs_read_csr(cs); 1198 zs_write_csr(cs, ZSWR0_RESET_STATUS); 1199 1200 /* 1201 * Check here for console break, so that we can abort 1202 * even when interrupts are locking up the machine. 1203 */ 1204 if (ISSET(rr0, ZSRR0_BREAK) && 1205 ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 1206 zs_abort(cs); 1207 return; 1208 } 1209 1210 delta = rr0 ^ cs->cs_rr0; 1211 cs->cs_rr0 = rr0; 1212 if (ISSET(delta, cs->cs_rr0_mask)) { 1213 SET(cs->cs_rr0_delta, delta); 1214 1215 /* 1216 * Stop output immediately if we lose the output 1217 * flow control signal or carrier detect. 1218 */ 1219 if (ISSET(~rr0, cs->cs_rr0_mask)) { 1220 zst->zst_tbc = 0; 1221 zst->zst_heldtbc = 0; 1222 } 1223 1224 zst->zst_st_check = 1; 1225 cs->cs_softreq = 1; 1226 } 1227 } 1228 1229 void 1230 zstty_diag(arg) 1231 void *arg; 1232 { 1233 struct zstty_softc *zst = arg; 1234 int overflows, floods; 1235 int s; 1236 1237 s = splzs(); 1238 overflows = zst->zst_overflows; 1239 zst->zst_overflows = 0; 1240 floods = zst->zst_floods; 1241 zst->zst_floods = 0; 1242 zst->zst_errors = 0; 1243 splx(s); 1244 1245 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1246 zst->zst_dev.dv_xname, 1247 overflows, overflows == 1 ? "" : "s", 1248 floods, floods == 1 ? "" : "s"); 1249 } 1250 1251 integrate void 1252 zstty_rxsoft(zst, tp) 1253 struct zstty_softc *zst; 1254 struct tty *tp; 1255 { 1256 struct zs_chanstate *cs = zst->zst_cs; 1257 int (*rint) __P((int c, struct tty *tp)) = linesw[tp->t_line].l_rint; 1258 u_char *get, *end; 1259 u_int cc, scc; 1260 u_char rr1; 1261 int code; 1262 int s; 1263 1264 end = zst->zst_ebuf; 1265 get = zst->zst_rbget; 1266 scc = cc = zstty_rbuf_size - zst->zst_rbavail; 1267 1268 if (cc == zstty_rbuf_size) { 1269 zst->zst_floods++; 1270 if (zst->zst_errors++ == 0) 1271 timeout(zstty_diag, zst, 60 * hz); 1272 } 1273 1274 while (cc) { 1275 code = get[0]; 1276 rr1 = get[1]; 1277 if (ISSET(rr1, ZSRR1_DO | ZSRR1_FE | ZSRR1_PE)) { 1278 if (ISSET(rr1, ZSRR1_DO)) { 1279 zst->zst_overflows++; 1280 if (zst->zst_errors++ == 0) 1281 timeout(zstty_diag, zst, 60 * hz); 1282 } 1283 if (ISSET(rr1, ZSRR1_FE)) 1284 SET(code, TTY_FE); 1285 if (ISSET(rr1, ZSRR1_PE)) 1286 SET(code, TTY_PE); 1287 } 1288 if ((*rint)(code, tp) == -1) { 1289 /* 1290 * The line discipline's buffer is out of space. 1291 */ 1292 if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1293 /* 1294 * We're either not using flow control, or the 1295 * line discipline didn't tell us to block for 1296 * some reason. Either way, we have no way to 1297 * know when there's more space available, so 1298 * just drop the rest of the data. 1299 */ 1300 get += cc << 1; 1301 if (get >= end) 1302 get -= zstty_rbuf_size << 1; 1303 cc = 0; 1304 } else { 1305 /* 1306 * Don't schedule any more receive processing 1307 * until the line discipline tells us there's 1308 * space available (through comhwiflow()). 1309 * Leave the rest of the data in the input 1310 * buffer. 1311 */ 1312 SET(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1313 } 1314 break; 1315 } 1316 get += 2; 1317 if (get >= end) 1318 get = zst->zst_rbuf; 1319 cc--; 1320 } 1321 1322 if (cc != scc) { 1323 zst->zst_rbget = get; 1324 s = splzs(); 1325 cc = zst->zst_rbavail += scc - cc; 1326 /* Buffers should be ok again, release possible block. */ 1327 if (cc >= zst->zst_r_lowat) { 1328 if (ISSET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED)) { 1329 CLR(zst->zst_rx_flags, RX_IBUF_OVERFLOWED); 1330 SET(cs->cs_preg[1], ZSWR1_RIE); 1331 cs->cs_creg[1] = cs->cs_preg[1]; 1332 zs_write_reg(cs, 1, cs->cs_creg[1]); 1333 } 1334 if (ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED)) { 1335 CLR(zst->zst_rx_flags, RX_IBUF_BLOCKED); 1336 zs_hwiflow(zst); 1337 } 1338 } 1339 splx(s); 1340 } 1341 1342 #if 0 1343 printf("%xS%04d\n", zst->zst_rx_flags, zst->zst_rbavail); 1344 #endif 1345 } 1346 1347 integrate void 1348 zstty_txsoft(zst, tp) 1349 struct zstty_softc *zst; 1350 struct tty *tp; 1351 { 1352 1353 CLR(tp->t_state, TS_BUSY); 1354 if (ISSET(tp->t_state, TS_FLUSH)) 1355 CLR(tp->t_state, TS_FLUSH); 1356 else 1357 ndflush(&tp->t_outq, (int)(zst->zst_tba - tp->t_outq.c_cf)); 1358 (*linesw[tp->t_line].l_start)(tp); 1359 } 1360 1361 integrate void 1362 zstty_stsoft(zst, tp) 1363 struct zstty_softc *zst; 1364 struct tty *tp; 1365 { 1366 struct zs_chanstate *cs = zst->zst_cs; 1367 u_char rr0, delta; 1368 int s; 1369 1370 s = splzs(); 1371 rr0 = cs->cs_rr0; 1372 delta = cs->cs_rr0_delta; 1373 cs->cs_rr0_delta = 0; 1374 splx(s); 1375 1376 if (ISSET(delta, cs->cs_rr0_dcd)) { 1377 /* 1378 * Inform the tty layer that carrier detect changed. 1379 */ 1380 (void) (*linesw[tp->t_line].l_modem)(tp, ISSET(rr0, ZSRR0_DCD)); 1381 } 1382 1383 if (ISSET(delta, cs->cs_rr0_cts)) { 1384 /* Block or unblock output according to flow control. */ 1385 if (ISSET(rr0, cs->cs_rr0_cts)) { 1386 zst->zst_tx_stopped = 0; 1387 (*linesw[tp->t_line].l_start)(tp); 1388 } else { 1389 zst->zst_tx_stopped = 1; 1390 } 1391 } 1392 } 1393 1394 /* 1395 * Software interrupt. Called at zssoft 1396 * 1397 * The main job to be done here is to empty the input ring 1398 * by passing its contents up to the tty layer. The ring is 1399 * always emptied during this operation, therefore the ring 1400 * must not be larger than the space after "high water" in 1401 * the tty layer, or the tty layer might drop our input. 1402 * 1403 * Note: an "input blockage" condition is assumed to exist if 1404 * EITHER the TS_TBLOCK flag or zst_rx_blocked flag is set. 1405 */ 1406 static void 1407 zstty_softint(cs) 1408 struct zs_chanstate *cs; 1409 { 1410 struct zstty_softc *zst = cs->cs_private; 1411 struct tty *tp = zst->zst_tty; 1412 int s; 1413 1414 s = spltty(); 1415 1416 if (zst->zst_rx_ready) { 1417 zst->zst_rx_ready = 0; 1418 zstty_rxsoft(zst, tp); 1419 } 1420 1421 if (zst->zst_st_check) { 1422 zst->zst_st_check = 0; 1423 zstty_stsoft(zst, tp); 1424 } 1425 1426 if (zst->zst_tx_done) { 1427 zst->zst_tx_done = 0; 1428 zstty_txsoft(zst, tp); 1429 } 1430 1431 splx(s); 1432 } 1433 1434 struct zsops zsops_tty = { 1435 zstty_rxint, /* receive char available */ 1436 zstty_stint, /* external/status */ 1437 zstty_txint, /* xmit buffer empty */ 1438 zstty_softint, /* process software interrupt */ 1439 }; 1440
Indexes created Sun Sep 28 16:09:52 GMT 2025