z8530tty.c revision 1.110
1/* $NetBSD: z8530tty.c,v 1.110 2006/07/22 15:09:09 martin 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) 1992, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * This software was developed by the Computer Systems Engineering group 38 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 39 * contributed to Berkeley. 40 * 41 * All advertising materials mentioning features or use of this software 42 * must display the following acknowledgement: 43 * This product includes software developed by the University of 44 * California, Lawrence Berkeley Laboratory. 45 * 46 * Redistribution and use in source and binary forms, with or without 47 * modification, are permitted provided that the following conditions 48 * are met: 49 * 1. Redistributions of source code must retain the above copyright 50 * notice, this list of conditions and the following disclaimer. 51 * 2. Redistributions in binary form must reproduce the above copyright 52 * notice, this list of conditions and the following disclaimer in the 53 * documentation and/or other materials provided with the distribution. 54 * 3. Neither the name of the University nor the names of its contributors 55 * may be used to endorse or promote products derived from this software 56 * without specific prior written permission. 57 * 58 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 59 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 60 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 61 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 62 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 63 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 64 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 65 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 66 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 67 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 68 * SUCH DAMAGE. 69 * 70 * @(#)zs.c 8.1 (Berkeley) 7/19/93 71 */ 72 73/* 74 * Copyright (c) 1994 Gordon W. Ross 75 * 76 * This software was developed by the Computer Systems Engineering group 77 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 78 * contributed to Berkeley. 79 * 80 * All advertising materials mentioning features or use of this software 81 * must display the following acknowledgement: 82 * This product includes software developed by the University of 83 * California, Lawrence Berkeley Laboratory. 84 * 85 * Redistribution and use in source and binary forms, with or without 86 * modification, are permitted provided that the following conditions 87 * are met: 88 * 1. Redistributions of source code must retain the above copyright 89 * notice, this list of conditions and the following disclaimer. 90 * 2. Redistributions in binary form must reproduce the above copyright 91 * notice, this list of conditions and the following disclaimer in the 92 * documentation and/or other materials provided with the distribution. 93 * 3. All advertising materials mentioning features or use of this software 94 * must display the following acknowledgement: 95 * This product includes software developed by the University of 96 * California, Berkeley and its contributors. 97 * 4. Neither the name of the University nor the names of its contributors 98 * may be used to endorse or promote products derived from this software 99 * without specific prior written permission. 100 * 101 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 102 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 103 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 104 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 105 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 106 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 107 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 108 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 109 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 110 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 111 * SUCH DAMAGE. 112 * 113 * @(#)zs.c 8.1 (Berkeley) 7/19/93 114 */ 115 116/* 117 * Zilog Z8530 Dual UART driver (tty interface) 118 * 119 * This is the "slave" driver that will be attached to 120 * the "zsc" driver for plain "tty" async. serial lines. 121 * 122 * Credits, history: 123 * 124 * The original version of this code was the sparc/dev/zs.c driver 125 * as distributed with the Berkeley 4.4 Lite release. Since then, 126 * Gordon Ross reorganized the code into the current parent/child 127 * driver scheme, separating the Sun keyboard and mouse support 128 * into independent child drivers. 129 * 130 * RTS/CTS flow-control support was a collaboration of: 131 * Gordon Ross <gwr@NetBSD.org>, 132 * Bill Studenmund <wrstuden@loki.stanford.edu> 133 * Ian Dall <Ian.Dall@dsto.defence.gov.au> 134 * 135 * The driver was massively overhauled in November 1997 by Charles Hannum, 136 * fixing *many* bugs, and substantially improving performance. 137 */ 138 139#include <sys/cdefs.h> 140__KERNEL_RCSID(0, "$NetBSD: z8530tty.c,v 1.110 2006/07/22 15:09:09 martin Exp $"); 141 142#include "opt_kgdb.h" 143#include "opt_ntp.h" 144 145#include <sys/param.h> 146#include <sys/systm.h> 147#include <sys/proc.h> 148#include <sys/device.h> 149#include <sys/conf.h> 150#include <sys/file.h> 151#include <sys/ioctl.h> 152#include <sys/malloc.h> 153#include <sys/timepps.h> 154#include <sys/tty.h> 155#include <sys/time.h> 156#include <sys/kernel.h> 157#include <sys/syslog.h> 158#include <sys/kauth.h> 159 160#include <dev/ic/z8530reg.h> 161#include <machine/z8530var.h> 162 163#include <dev/cons.h> 164 165#include "locators.h" 166 167/* 168 * How many input characters we can buffer. 169 * The port-specific var.h may override this. 170 * Note: must be a power of two! 171 */ 172#ifndef ZSTTY_RING_SIZE 173#define ZSTTY_RING_SIZE 2048 174#endif 175 176static struct cnm_state zstty_cnm_state; 177/* 178 * Make this an option variable one can patch. 179 * But be warned: this must be a power of 2! 180 */ 181u_int zstty_rbuf_size = ZSTTY_RING_SIZE; 182 183/* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */ 184u_int zstty_rbuf_hiwat = (ZSTTY_RING_SIZE * 1) / 4; 185u_int zstty_rbuf_lowat = (ZSTTY_RING_SIZE * 3) / 4; 186 187#ifndef __HAVE_TIMECOUNTER 188static int zsppscap = 189 PPS_TSFMT_TSPEC | 190 PPS_CAPTUREASSERT | 191 PPS_CAPTURECLEAR | 192 PPS_OFFSETASSERT | PPS_OFFSETCLEAR; 193#endif /* __HAVE_TIMECOUNTER */ 194 195struct zstty_softc { 196 struct device zst_dev; /* required first: base device */ 197 struct tty *zst_tty; 198 struct zs_chanstate *zst_cs; 199 200 struct callout zst_diag_ch; 201 202 u_int zst_overflows, 203 zst_floods, 204 zst_errors; 205 206 int zst_hwflags, /* see z8530var.h */ 207 zst_swflags; /* TIOCFLAG_SOFTCAR, ... <ttycom.h> */ 208 209 u_int zst_r_hiwat, 210 zst_r_lowat; 211 u_char *volatile zst_rbget, 212 *volatile zst_rbput; 213 volatile u_int zst_rbavail; 214 u_char *zst_rbuf, 215 *zst_ebuf; 216 217 /* 218 * The transmit byte count and address are used for pseudo-DMA 219 * output in the hardware interrupt code. PDMA can be suspended 220 * to get pending changes done; heldtbc is used for this. It can 221 * also be stopped for ^S; this sets TS_TTSTOP in tp->t_state. 222 */ 223 u_char *zst_tba; /* transmit buffer address */ 224 u_int zst_tbc, /* transmit byte count */ 225 zst_heldtbc; /* held tbc while xmission stopped */ 226 227 /* Flags to communicate with zstty_softint() */ 228 volatile u_char zst_rx_flags, /* receiver blocked */ 229#define RX_TTY_BLOCKED 0x01 230#define RX_TTY_OVERFLOWED 0x02 231#define RX_IBUF_BLOCKED 0x04 232#define RX_IBUF_OVERFLOWED 0x08 233#define RX_ANY_BLOCK 0x0f 234 zst_tx_busy, /* working on an output chunk */ 235 zst_tx_done, /* done with one output chunk */ 236 zst_tx_stopped, /* H/W level stop (lost CTS) */ 237 zst_st_check, /* got a status interrupt */ 238 zst_rx_ready; 239 240 /* PPS signal on DCD, with or without inkernel clock disciplining */ 241 u_char zst_ppsmask; /* pps signal mask */ 242#ifdef __HAVE_TIMECOUNTER 243 struct pps_state zst_pps_state; 244#else /* !__HAVE_TIMECOUNTER */ 245 u_char zst_ppsassert; /* pps leading edge */ 246 u_char zst_ppsclear; /* pps trailing edge */ 247 pps_info_t ppsinfo; 248 pps_params_t ppsparam; 249#endif /* !__HAVE_TIMECOUNTER */ 250}; 251 252/* Definition of the driver for autoconfig. */ 253static int zstty_match(struct device *, struct cfdata *, void *); 254static void zstty_attach(struct device *, struct device *, void *); 255 256CFATTACH_DECL(zstty, sizeof(struct zstty_softc), 257 zstty_match, zstty_attach, NULL, NULL); 258 259extern struct cfdriver zstty_cd; 260 261dev_type_open(zsopen); 262dev_type_close(zsclose); 263dev_type_read(zsread); 264dev_type_write(zswrite); 265dev_type_ioctl(zsioctl); 266dev_type_stop(zsstop); 267dev_type_tty(zstty); 268dev_type_poll(zspoll); 269 270const struct cdevsw zstty_cdevsw = { 271 zsopen, zsclose, zsread, zswrite, zsioctl, 272 zsstop, zstty, zspoll, nommap, ttykqfilter, D_TTY 273}; 274 275struct zsops zsops_tty; 276 277static void zs_shutdown(struct zstty_softc *); 278static void zsstart(struct tty *); 279static int zsparam(struct tty *, struct termios *); 280static void zs_modem(struct zstty_softc *, int); 281static void tiocm_to_zs(struct zstty_softc *, u_long, int); 282static int zs_to_tiocm(struct zstty_softc *); 283static int zshwiflow(struct tty *, int); 284static void zs_hwiflow(struct zstty_softc *); 285static void zs_maskintr(struct zstty_softc *); 286 287/* Low-level routines. */ 288static void zstty_rxint (struct zs_chanstate *); 289static void zstty_stint (struct zs_chanstate *, int); 290static void zstty_txint (struct zs_chanstate *); 291static void zstty_softint(struct zs_chanstate *); 292 293#define ZSUNIT(x) (minor(x) & 0x7ffff) 294#define ZSDIALOUT(x) (minor(x) & 0x80000) 295 296struct tty *zstty_get_tty_from_dev(struct device *); 297 298/* 299 * XXX get the (struct tty *) out of a (struct device *) we trust to be a 300 * (struct zstty_softc *) - needed by sparc/dev/zs.c, sparc64/dev/zs.c, 301 * sun3/dev/zs.c and sun2/dev/zs.c will probably need it at some point 302 */ 303 304struct tty * 305zstty_get_tty_from_dev(struct device *dev) 306{ 307 struct zstty_softc *sc = (struct zstty_softc *)dev; 308 309 return sc->zst_tty; 310} 311 312/* 313 * zstty_match: how is this zs channel configured? 314 */ 315int 316zstty_match(parent, cf, aux) 317 struct device *parent; 318 struct cfdata *cf; 319 void *aux; 320{ 321 struct zsc_attach_args *args = aux; 322 323 /* Exact match is better than wildcard. */ 324 if (cf->zsccf_channel == args->channel) 325 return 2; 326 327 /* This driver accepts wildcard. */ 328 if (cf->zsccf_channel == ZSCCF_CHANNEL_DEFAULT) 329 return 1; 330 331 return 0; 332} 333 334void 335zstty_attach(parent, self, aux) 336 struct device *parent, *self; 337 void *aux; 338 339{ 340 struct zsc_softc *zsc = (void *) parent; 341 struct zstty_softc *zst = (void *) self; 342 struct cfdata *cf = device_cfdata(self); 343 struct zsc_attach_args *args = aux; 344 struct zs_chanstate *cs; 345 struct tty *tp; 346 int channel, s, tty_unit; 347 dev_t dev; 348 const char *i, *o; 349 int dtr_on; 350 int resetbit; 351 352 callout_init(&zst->zst_diag_ch); 353 cn_init_magic(&zstty_cnm_state); 354 355 tty_unit = device_unit(&zst->zst_dev); 356 channel = args->channel; 357 cs = zsc->zsc_cs[channel]; 358 cs->cs_private = zst; 359 cs->cs_ops = &zsops_tty; 360 361 zst->zst_cs = cs; 362 zst->zst_swflags = cf->cf_flags; /* softcar, etc. */ 363 zst->zst_hwflags = args->hwflags; 364 dev = makedev(cdevsw_lookup_major(&zstty_cdevsw), tty_unit); 365 366 if (zst->zst_swflags) 367 printf(" flags 0x%x", zst->zst_swflags); 368 369 /* 370 * Check whether we serve as a console device. 371 * XXX - split console input/output channels aren't 372 * supported yet on /dev/console 373 */ 374 i = o = NULL; 375 if ((zst->zst_hwflags & ZS_HWFLAG_CONSOLE_INPUT) != 0) { 376 i = "input"; 377 if ((args->hwflags & ZS_HWFLAG_USE_CONSDEV) != 0) { 378 args->consdev->cn_dev = dev; 379 cn_tab->cn_pollc = args->consdev->cn_pollc; 380 cn_tab->cn_getc = args->consdev->cn_getc; 381 } 382 cn_tab->cn_dev = dev; 383 /* Set console magic to BREAK */ 384 cn_set_magic("\047\001"); 385 } 386 if ((zst->zst_hwflags & ZS_HWFLAG_CONSOLE_OUTPUT) != 0) { 387 o = "output"; 388 if ((args->hwflags & ZS_HWFLAG_USE_CONSDEV) != 0) { 389 cn_tab->cn_putc = args->consdev->cn_putc; 390 } 391 cn_tab->cn_dev = dev; 392 } 393 if (i != NULL || o != NULL) 394 printf(" (console %s)", i ? (o ? "i/o" : i) : o); 395 396#ifdef KGDB 397 if (zs_check_kgdb(cs, dev)) { 398 /* 399 * Allow kgdb to "take over" this port. Returns true 400 * if this serial port is in-use by kgdb. 401 */ 402 printf(" (kgdb)\n"); 403 /* 404 * This is the kgdb port (exclusive use) 405 * so skip the normal attach code. 406 */ 407 return; 408 } 409#endif 410 printf("\n"); 411 412 tp = ttymalloc(); 413 tp->t_dev = dev; 414 tp->t_oproc = zsstart; 415 tp->t_param = zsparam; 416 tp->t_hwiflow = zshwiflow; 417 tty_attach(tp); 418 419 zst->zst_tty = tp; 420 zst->zst_rbuf = malloc(zstty_rbuf_size << 1, M_DEVBUF, M_NOWAIT); 421 if (zst->zst_rbuf == NULL) { 422 aprint_error("%s: unable to allocate ring buffer\n", 423 zst->zst_dev.dv_xname); 424 return; 425 } 426 zst->zst_ebuf = zst->zst_rbuf + (zstty_rbuf_size << 1); 427 /* Disable the high water mark. */ 428 zst->zst_r_hiwat = 0; 429 zst->zst_r_lowat = 0; 430 zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf; 431 zst->zst_rbavail = zstty_rbuf_size; 432 433 /* if there are no enable/disable functions, assume the device 434 is always enabled */ 435 if (!cs->enable) 436 cs->enabled = 1; 437 438 /* 439 * Hardware init 440 */ 441 dtr_on = 0; 442 resetbit = 0; 443 if (ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 444 /* Call zsparam similar to open. */ 445 struct termios t; 446 447 /* Wait a while for previous console output to complete */ 448 DELAY(10000); 449 450 /* Setup the "new" parameters in t. */ 451 t.c_ispeed = 0; 452 t.c_ospeed = cs->cs_defspeed; 453 t.c_cflag = cs->cs_defcflag; 454 455 /* 456 * Turn on receiver and status interrupts. 457 * We defer the actual write of the register to zsparam(), 458 * but we must make sure status interrupts are turned on by 459 * the time zsparam() reads the initial rr0 state. 460 */ 461 SET(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE); 462 463 /* Make sure zsparam will see changes. */ 464 tp->t_ospeed = 0; 465 (void) zsparam(tp, &t); 466 467 /* Make sure DTR is on now. */ 468 dtr_on = 1; 469 470 } else if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_NORESET)) { 471 /* Not the console; may need reset. */ 472 resetbit = (channel == 0) ? ZSWR9_A_RESET : ZSWR9_B_RESET; 473 } 474 475 s = splzs(); 476 simple_lock(&cs->cs_lock); 477 if (resetbit) 478 zs_write_reg(cs, 9, resetbit); 479 zs_modem(zst, dtr_on); 480 simple_unlock(&cs->cs_lock); 481 splx(s); 482} 483 484 485/* 486 * Return pointer to our tty. 487 */ 488struct tty * 489zstty(dev) 490 dev_t dev; 491{ 492 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 493 494 return (zst->zst_tty); 495} 496 497 498void 499zs_shutdown(zst) 500 struct zstty_softc *zst; 501{ 502 struct zs_chanstate *cs = zst->zst_cs; 503 struct tty *tp = zst->zst_tty; 504 int s; 505 506 s = splzs(); 507 simple_lock(&cs->cs_lock); 508 509 /* If we were asserting flow control, then deassert it. */ 510 SET(zst->zst_rx_flags, RX_IBUF_BLOCKED); 511 zs_hwiflow(zst); 512 513 /* Clear any break condition set with TIOCSBRK. */ 514 zs_break(cs, 0); 515 516#ifndef __HAVE_TIMECOUNTER 517 /* Turn off PPS capture on last close. */ 518 zst->zst_ppsmask = 0; 519 zst->ppsparam.mode = 0; 520#endif /* __HAVE_TIMECOUNTER */ 521 522 /* 523 * Hang up if necessary. Wait a bit, so the other side has time to 524 * notice even if we immediately open the port again. 525 */ 526 if (ISSET(tp->t_cflag, HUPCL)) { 527 zs_modem(zst, 0); 528 simple_unlock(&cs->cs_lock); 529 splx(s); 530 /* 531 * XXX - another process is not prevented from opening 532 * the device during our sleep. 533 */ 534 (void) tsleep(cs, TTIPRI, ttclos, hz); 535 /* Re-check state in case we were opened during our sleep */ 536 if (ISSET(tp->t_state, TS_ISOPEN) || tp->t_wopen != 0) 537 return; 538 539 s = splzs(); 540 simple_lock(&cs->cs_lock); 541 } 542 543 /* Turn off interrupts if not the console. */ 544 if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 545 CLR(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE); 546 cs->cs_creg[1] = cs->cs_preg[1]; 547 zs_write_reg(cs, 1, cs->cs_creg[1]); 548 } 549 550 /* Call the power management hook. */ 551 if (cs->disable) { 552#ifdef DIAGNOSTIC 553 if (!cs->enabled) 554 panic("zs_shutdown: not enabled?"); 555#endif 556 (*cs->disable)(zst->zst_cs); 557 } 558 559 simple_unlock(&cs->cs_lock); 560 splx(s); 561} 562 563/* 564 * Open a zs serial (tty) port. 565 */ 566int 567zsopen(dev, flags, mode, l) 568 dev_t dev; 569 int flags; 570 int mode; 571 struct lwp *l; 572{ 573 struct zstty_softc *zst; 574 struct zs_chanstate *cs; 575 struct tty *tp; 576 int s, s2; 577 int error; 578 579 zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 580 if (zst == NULL) 581 return (ENXIO); 582 583 tp = zst->zst_tty; 584 cs = zst->zst_cs; 585 586 /* If KGDB took the line, then tp==NULL */ 587 if (tp == NULL) 588 return (EBUSY); 589 590 if (ISSET(tp->t_state, TS_ISOPEN) && 591 ISSET(tp->t_state, TS_XCLUDE) && 592 kauth_authorize_generic(l->l_cred, KAUTH_GENERIC_ISSUSER, 593 &l->l_acflag) != 0) 594 return (EBUSY); 595 596 s = spltty(); 597 598 /* 599 * Do the following iff this is a first open. 600 */ 601 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 602 struct termios t; 603 604 tp->t_dev = dev; 605 606 /* Call the power management hook. */ 607 if (cs->enable) { 608 if ((*cs->enable)(cs)) { 609 splx(s); 610 printf("%s: device enable failed\n", 611 zst->zst_dev.dv_xname); 612 return (EIO); 613 } 614 } 615 616 /* 617 * Initialize the termios status to the defaults. Add in the 618 * sticky bits from TIOCSFLAGS. 619 */ 620 t.c_ispeed = 0; 621 t.c_ospeed = cs->cs_defspeed; 622 t.c_cflag = cs->cs_defcflag; 623 if (ISSET(zst->zst_swflags, TIOCFLAG_CLOCAL)) 624 SET(t.c_cflag, CLOCAL); 625 if (ISSET(zst->zst_swflags, TIOCFLAG_CRTSCTS)) 626 SET(t.c_cflag, CRTSCTS); 627 if (ISSET(zst->zst_swflags, TIOCFLAG_CDTRCTS)) 628 SET(t.c_cflag, CDTRCTS); 629 if (ISSET(zst->zst_swflags, TIOCFLAG_MDMBUF)) 630 SET(t.c_cflag, MDMBUF); 631 632 s2 = splzs(); 633 simple_lock(&cs->cs_lock); 634 635 /* 636 * Turn on receiver and status interrupts. 637 * We defer the actual write of the register to zsparam(), 638 * but we must make sure status interrupts are turned on by 639 * the time zsparam() reads the initial rr0 state. 640 */ 641 SET(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE); 642 643 /* Clear PPS capture state on first open. */ 644 zst->zst_ppsmask = 0; 645#ifdef __HAVE_TIMECOUNTER 646 memset(&zst->zst_pps_state, 0, sizeof(zst->zst_pps_state)); 647 zst->zst_pps_state.ppscap = PPS_CAPTUREASSERT | PPS_CAPTURECLEAR; 648 pps_init(&zst->zst_pps_state); 649#else /* !__HAVE_TIMECOUNTER */ 650 zst->ppsparam.mode = 0; 651#endif /* !__HAVE_TIMECOUNTER */ 652 653 simple_unlock(&cs->cs_lock); 654 splx(s2); 655 656 /* Make sure zsparam will see changes. */ 657 tp->t_ospeed = 0; 658 (void) zsparam(tp, &t); 659 660 /* 661 * Note: zsparam has done: cflag, ispeed, ospeed 662 * so we just need to do: iflag, oflag, lflag, cc 663 * For "raw" mode, just leave all zeros. 664 */ 665 if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_RAW)) { 666 tp->t_iflag = TTYDEF_IFLAG; 667 tp->t_oflag = TTYDEF_OFLAG; 668 tp->t_lflag = TTYDEF_LFLAG; 669 } else { 670 tp->t_iflag = 0; 671 tp->t_oflag = 0; 672 tp->t_lflag = 0; 673 } 674 ttychars(tp); 675 ttsetwater(tp); 676 677 s2 = splzs(); 678 simple_lock(&cs->cs_lock); 679 680 /* 681 * Turn on DTR. We must always do this, even if carrier is not 682 * present, because otherwise we'd have to use TIOCSDTR 683 * immediately after setting CLOCAL, which applications do not 684 * expect. We always assert DTR while the device is open 685 * unless explicitly requested to deassert it. 686 */ 687 zs_modem(zst, 1); 688 689 /* Clear the input ring, and unblock. */ 690 zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf; 691 zst->zst_rbavail = zstty_rbuf_size; 692 zs_iflush(cs); 693 CLR(zst->zst_rx_flags, RX_ANY_BLOCK); 694 zs_hwiflow(zst); 695 696 simple_unlock(&cs->cs_lock); 697 splx(s2); 698 } 699 700 splx(s); 701 702 error = ttyopen(tp, ZSDIALOUT(dev), ISSET(flags, O_NONBLOCK)); 703 if (error) 704 goto bad; 705 706 error = (*tp->t_linesw->l_open)(dev, tp); 707 if (error) 708 goto bad; 709 710 return (0); 711 712bad: 713 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 714 /* 715 * We failed to open the device, and nobody else had it opened. 716 * Clean up the state as appropriate. 717 */ 718 zs_shutdown(zst); 719 } 720 721 return (error); 722} 723 724/* 725 * Close a zs serial port. 726 */ 727int 728zsclose(dev, flags, mode, l) 729 dev_t dev; 730 int flags; 731 int mode; 732 struct lwp *l; 733{ 734 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 735 struct tty *tp = zst->zst_tty; 736 737 /* XXX This is for cons.c. */ 738 if (!ISSET(tp->t_state, TS_ISOPEN)) 739 return 0; 740 741 (*tp->t_linesw->l_close)(tp, flags); 742 ttyclose(tp); 743 744 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 745 /* 746 * Although we got a last close, the device may still be in 747 * use; e.g. if this was the dialout node, and there are still 748 * processes waiting for carrier on the non-dialout node. 749 */ 750 zs_shutdown(zst); 751 } 752 753 return (0); 754} 755 756/* 757 * Read/write zs serial port. 758 */ 759int 760zsread(dev, uio, flags) 761 dev_t dev; 762 struct uio *uio; 763 int flags; 764{ 765 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 766 struct tty *tp = zst->zst_tty; 767 768 return ((*tp->t_linesw->l_read)(tp, uio, flags)); 769} 770 771int 772zswrite(dev, uio, flags) 773 dev_t dev; 774 struct uio *uio; 775 int flags; 776{ 777 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 778 struct tty *tp = zst->zst_tty; 779 780 return ((*tp->t_linesw->l_write)(tp, uio, flags)); 781} 782 783int 784zspoll(dev, events, l) 785 dev_t dev; 786 int events; 787 struct lwp *l; 788{ 789 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 790 struct tty *tp = zst->zst_tty; 791 792 return ((*tp->t_linesw->l_poll)(tp, events, l)); 793} 794 795int 796zsioctl(dev, cmd, data, flag, l) 797 dev_t dev; 798 u_long cmd; 799 caddr_t data; 800 int flag; 801 struct lwp *l; 802{ 803 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 804 struct zs_chanstate *cs = zst->zst_cs; 805 struct tty *tp = zst->zst_tty; 806 int error; 807 int s; 808 809 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 810 if (error != EPASSTHROUGH) 811 return (error); 812 813 error = ttioctl(tp, cmd, data, flag, l); 814 if (error != EPASSTHROUGH) 815 return (error); 816 817#ifdef ZS_MD_IOCTL 818 error = ZS_MD_IOCTL(cs, cmd, data); 819 if (error != EPASSTHROUGH) 820 return (error); 821#endif /* ZS_MD_IOCTL */ 822 823 error = 0; 824 825 s = splzs(); 826 simple_lock(&cs->cs_lock); 827 828 switch (cmd) { 829 case TIOCSBRK: 830 zs_break(cs, 1); 831 break; 832 833 case TIOCCBRK: 834 zs_break(cs, 0); 835 break; 836 837 case TIOCGFLAGS: 838 *(int *)data = zst->zst_swflags; 839 break; 840 841 case TIOCSFLAGS: 842 error = kauth_authorize_generic(l->l_cred, KAUTH_GENERIC_ISSUSER, 843 &l->l_acflag); 844 if (error) 845 break; 846 zst->zst_swflags = *(int *)data; 847 break; 848 849 case TIOCSDTR: 850 zs_modem(zst, 1); 851 break; 852 853 case TIOCCDTR: 854 zs_modem(zst, 0); 855 break; 856 857 case TIOCMSET: 858 case TIOCMBIS: 859 case TIOCMBIC: 860 tiocm_to_zs(zst, cmd, *(int *)data); 861 break; 862 863 case TIOCMGET: 864 *(int *)data = zs_to_tiocm(zst); 865 break; 866 867#ifdef __HAVE_TIMECOUNTER 868 case PPS_IOC_CREATE: 869 case PPS_IOC_DESTROY: 870 case PPS_IOC_GETPARAMS: 871 case PPS_IOC_SETPARAMS: 872 case PPS_IOC_GETCAP: 873 case PPS_IOC_FETCH: 874#ifdef PPS_SYNC 875 case PPS_IOC_KCBIND: 876#endif 877 error = pps_ioctl(cmd, data, &zst->zst_pps_state); 878 if (zst->zst_pps_state.ppsparam.mode & PPS_CAPTUREBOTH) 879 zst->zst_ppsmask = ZSRR0_DCD; 880 else 881 zst->zst_ppsmask = 0; 882 break; 883#else /* !__HAVE_TIMECOUNTER */ 884 case PPS_IOC_CREATE: 885 break; 886 887 case PPS_IOC_DESTROY: 888 break; 889 890 case PPS_IOC_GETPARAMS: { 891 pps_params_t *pp; 892 pp = (pps_params_t *)data; 893 *pp = zst->ppsparam; 894 break; 895 } 896 897 case PPS_IOC_SETPARAMS: { 898 pps_params_t *pp; 899 int mode; 900 if (cs->cs_rr0_pps == 0) { 901 error = EINVAL; 902 break; 903 } 904 pp = (pps_params_t *)data; 905 if (pp->mode & ~zsppscap) { 906 error = EINVAL; 907 break; 908 } 909 zst->ppsparam = *pp; 910 /* 911 * compute masks from user-specified timestamp state. 912 */ 913 mode = zst->ppsparam.mode; 914 switch (mode & PPS_CAPTUREBOTH) { 915 case 0: 916 zst->zst_ppsmask = 0; 917 break; 918 919 case PPS_CAPTUREASSERT: 920 zst->zst_ppsmask = ZSRR0_DCD; 921 zst->zst_ppsassert = ZSRR0_DCD; 922 zst->zst_ppsclear = -1; 923 break; 924 925 case PPS_CAPTURECLEAR: 926 zst->zst_ppsmask = ZSRR0_DCD; 927 zst->zst_ppsassert = -1; 928 zst->zst_ppsclear = 0; 929 break; 930 931 case PPS_CAPTUREBOTH: 932 zst->zst_ppsmask = ZSRR0_DCD; 933 zst->zst_ppsassert = ZSRR0_DCD; 934 zst->zst_ppsclear = 0; 935 break; 936 937 default: 938 error = EINVAL; 939 break; 940 } 941 942 /* 943 * Now update interrupts. 944 */ 945 zs_maskintr(zst); 946 /* 947 * If nothing is being transmitted, set up new current values, 948 * else mark them as pending. 949 */ 950 if (!cs->cs_heldchange) { 951 if (zst->zst_tx_busy) { 952 zst->zst_heldtbc = zst->zst_tbc; 953 zst->zst_tbc = 0; 954 cs->cs_heldchange = 1; 955 } else 956 zs_loadchannelregs(cs); 957 } 958 959 break; 960 } 961 962 case PPS_IOC_GETCAP: 963 *(int *)data = zsppscap; 964 break; 965 966 case PPS_IOC_FETCH: { 967 pps_info_t *pi; 968 pi = (pps_info_t *)data; 969 *pi = zst->ppsinfo; 970 break; 971 } 972 973#ifdef PPS_SYNC 974 case PPS_IOC_KCBIND: { 975 int edge = (*(int *)data) & PPS_CAPTUREBOTH; 976 977 if (edge == 0) { 978 /* 979 * remove binding for this source; ignore 980 * the request if this is not the current 981 * hardpps source 982 */ 983 if (pps_kc_hardpps_source == zst) { 984 pps_kc_hardpps_source = NULL; 985 pps_kc_hardpps_mode = 0; 986 } 987 } else { 988 /* 989 * bind hardpps to this source, replacing any 990 * previously specified source or edges 991 */ 992 pps_kc_hardpps_source = zst; 993 pps_kc_hardpps_mode = edge; 994 } 995 break; 996 } 997#endif /* PPS_SYNC */ 998#endif /* !__HAVE_TIMECOUNTER */ 999 1000 case TIOCDCDTIMESTAMP: /* XXX old, overloaded API used by xntpd v3 */ 1001 if (cs->cs_rr0_pps == 0) { 1002 error = EINVAL; 1003 break; 1004 } 1005#ifdef __HAVE_TIMECOUNTER 1006#ifndef PPS_TRAILING_EDGE 1007 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 1008 &zst->zst_pps_state.ppsinfo.assert_timestamp); 1009#else 1010 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 1011 &zst->zst_pps_state.ppsinfo.clear_timestamp); 1012#endif 1013#else /* !__HAVE_TIMECOUNTER */ 1014 zst->zst_ppsmask = ZSRR0_DCD; 1015#ifndef PPS_TRAILING_EDGE 1016 zst->zst_ppsassert = ZSRR0_DCD; 1017 zst->zst_ppsclear = -1; 1018 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 1019 &zst->ppsinfo.assert_timestamp); 1020#else 1021 zst->zst_ppsassert = -1; 1022 zst->zst_ppsclear = 01; 1023 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 1024 &zst->ppsinfo.clear_timestamp); 1025#endif 1026#endif /* !__HAVE_TIMECOUNTER */ 1027 /* 1028 * Now update interrupts. 1029 */ 1030 zs_maskintr(zst); 1031 /* 1032 * If nothing is being transmitted, set up new current values, 1033 * else mark them as pending. 1034 */ 1035 if (!cs->cs_heldchange) { 1036 if (zst->zst_tx_busy) { 1037 zst->zst_heldtbc = zst->zst_tbc; 1038 zst->zst_tbc = 0; 1039 cs->cs_heldchange = 1; 1040 } else 1041 zs_loadchannelregs(cs); 1042 } 1043 1044 break; 1045 1046 default: 1047 error = EPASSTHROUGH; 1048 break; 1049 } 1050 1051 simple_unlock(&cs->cs_lock); 1052 splx(s); 1053 1054 return (error); 1055} 1056 1057/* 1058 * Start or restart transmission. 1059 */ 1060static void 1061zsstart(tp) 1062 struct tty *tp; 1063{ 1064 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(tp->t_dev)); 1065 struct zs_chanstate *cs = zst->zst_cs; 1066 u_char *tba; 1067 int s, tbc; 1068 1069 s = spltty(); 1070 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 1071 goto out; 1072 if (zst->zst_tx_stopped) 1073 goto out; 1074 1075 if (tp->t_outq.c_cc <= tp->t_lowat) { 1076 if (ISSET(tp->t_state, TS_ASLEEP)) { 1077 CLR(tp->t_state, TS_ASLEEP); 1078 wakeup((caddr_t)&tp->t_outq); 1079 } 1080 selwakeup(&tp->t_wsel); 1081 if (tp->t_outq.c_cc == 0) 1082 goto out; 1083 } 1084 1085 /* Grab the first contiguous region of buffer space. */ 1086 tba = tp->t_outq.c_cf; 1087 tbc = ndqb(&tp->t_outq, 0); 1088 1089 (void) splzs(); 1090 simple_lock(&cs->cs_lock); 1091 1092 zst->zst_tba = tba; 1093 zst->zst_tbc = tbc; 1094 SET(tp->t_state, TS_BUSY); 1095 zst->zst_tx_busy = 1; 1096 1097#ifdef ZS_TXDMA 1098 if (zst->zst_tbc > 1) { 1099 zs_dma_setup(cs, zst->zst_tba, zst->zst_tbc); 1100 goto out; 1101 } 1102#endif 1103 1104 /* Enable transmit completion interrupts if necessary. */ 1105 if (!ISSET(cs->cs_preg[1], ZSWR1_TIE)) { 1106 SET(cs->cs_preg[1], ZSWR1_TIE); 1107 cs->cs_creg[1] = cs->cs_preg[1]; 1108 zs_write_reg(cs, 1, cs->cs_creg[1]); 1109 } 1110 1111 /* Output the first character of the contiguous buffer. */ 1112 zs_write_data(cs, *zst->zst_tba); 1113 zst->zst_tbc--; 1114 zst->zst_tba++; 1115 1116 simple_unlock(&cs->cs_lock); 1117out: 1118 splx(s); 1119 return; 1120} 1121 1122/* 1123 * Stop output, e.g., for ^S or output flush. 1124 */ 1125void 1126zsstop(tp, flag) 1127 struct tty *tp; 1128 int flag; 1129{ 1130 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(tp->t_dev)); 1131 int s; 1132 1133 s = splzs(); 1134 if (ISSET(tp->t_state, TS_BUSY)) { 1135 /* Stop transmitting at the next chunk. */ 1136 zst->zst_tbc = 0; 1137 zst->zst_heldtbc = 0; 1138 if (!ISSET(tp->t_state, TS_TTSTOP)) 1139 SET(tp->t_state, TS_FLUSH); 1140 } 1141 splx(s); 1142} 1143 1144/* 1145 * Set ZS tty parameters from termios. 1146 * XXX - Should just copy the whole termios after 1147 * making sure all the changes could be done. 1148 */ 1149static int 1150zsparam(tp, t) 1151 struct tty *tp; 1152 struct termios *t; 1153{ 1154 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(tp->t_dev)); 1155 struct zs_chanstate *cs = zst->zst_cs; 1156 int ospeed; 1157 tcflag_t cflag; 1158 u_char tmp3, tmp4, tmp5; 1159 int s, error; 1160 1161 ospeed = t->c_ospeed; 1162 cflag = t->c_cflag; 1163 1164 /* Check requested parameters. */ 1165 if (ospeed < 0) 1166 return (EINVAL); 1167 if (t->c_ispeed && t->c_ispeed != ospeed) 1168 return (EINVAL); 1169 1170 /* 1171 * For the console, always force CLOCAL and !HUPCL, so that the port 1172 * is always active. 1173 */ 1174 if (ISSET(zst->zst_swflags, TIOCFLAG_SOFTCAR) || 1175 ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 1176 SET(cflag, CLOCAL); 1177 CLR(cflag, HUPCL); 1178 } 1179 1180 /* 1181 * Only whack the UART when params change. 1182 * Some callers need to clear tp->t_ospeed 1183 * to make sure initialization gets done. 1184 */ 1185 if (tp->t_ospeed == ospeed && 1186 tp->t_cflag == cflag) 1187 return (0); 1188 1189 /* 1190 * Call MD functions to deal with changed 1191 * clock modes or H/W flow control modes. 1192 * The BRG divisor is set now. (reg 12,13) 1193 */ 1194 error = zs_set_speed(cs, ospeed); 1195 if (error) 1196 return (error); 1197 error = zs_set_modes(cs, cflag); 1198 if (error) 1199 return (error); 1200 1201 /* 1202 * Block interrupts so that state will not 1203 * be altered until we are done setting it up. 1204 * 1205 * Initial values in cs_preg are set before 1206 * our attach routine is called. The master 1207 * interrupt enable is handled by zsc.c 1208 * 1209 */ 1210 s = splzs(); 1211 simple_lock(&cs->cs_lock); 1212 1213 /* 1214 * Recalculate which status ints to enable. 1215 */ 1216 zs_maskintr(zst); 1217 1218 /* Recompute character size bits. */ 1219 tmp3 = cs->cs_preg[3]; 1220 tmp5 = cs->cs_preg[5]; 1221 CLR(tmp3, ZSWR3_RXSIZE); 1222 CLR(tmp5, ZSWR5_TXSIZE); 1223 switch (ISSET(cflag, CSIZE)) { 1224 case CS5: 1225 SET(tmp3, ZSWR3_RX_5); 1226 SET(tmp5, ZSWR5_TX_5); 1227 break; 1228 case CS6: 1229 SET(tmp3, ZSWR3_RX_6); 1230 SET(tmp5, ZSWR5_TX_6); 1231 break; 1232 case CS7: 1233 SET(tmp3, ZSWR3_RX_7); 1234 SET(tmp5, ZSWR5_TX_7); 1235 break; 1236 case CS8: 1237 SET(tmp3, ZSWR3_RX_8); 1238 SET(tmp5, ZSWR5_TX_8); 1239 break; 1240 } 1241 cs->cs_preg[3] = tmp3; 1242 cs->cs_preg[5] = tmp5; 1243 1244 /* 1245 * Recompute the stop bits and parity bits. Note that 1246 * zs_set_speed() may have set clock selection bits etc. 1247 * in wr4, so those must preserved. 1248 */ 1249 tmp4 = cs->cs_preg[4]; 1250 CLR(tmp4, ZSWR4_SBMASK | ZSWR4_PARMASK); 1251 if (ISSET(cflag, CSTOPB)) 1252 SET(tmp4, ZSWR4_TWOSB); 1253 else 1254 SET(tmp4, ZSWR4_ONESB); 1255 if (!ISSET(cflag, PARODD)) 1256 SET(tmp4, ZSWR4_EVENP); 1257 if (ISSET(cflag, PARENB)) 1258 SET(tmp4, ZSWR4_PARENB); 1259 cs->cs_preg[4] = tmp4; 1260 1261 /* And copy to tty. */ 1262 tp->t_ispeed = 0; 1263 tp->t_ospeed = ospeed; 1264 tp->t_cflag = cflag; 1265 1266 /* 1267 * If nothing is being transmitted, set up new current values, 1268 * else mark them as pending. 1269 */ 1270 if (!cs->cs_heldchange) { 1271 if (zst->zst_tx_busy) { 1272 zst->zst_heldtbc = zst->zst_tbc; 1273 zst->zst_tbc = 0; 1274 cs->cs_heldchange = 1; 1275 } else 1276 zs_loadchannelregs(cs); 1277 } 1278 1279 /* 1280 * If hardware flow control is disabled, turn off the buffer water 1281 * marks and unblock any soft flow control state. Otherwise, enable 1282 * the water marks. 1283 */ 1284 if (!ISSET(cflag, CHWFLOW)) { 1285 zst->zst_r_hiwat = 0; 1286 zst->zst_r_lowat = 0; 1287 if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1288 CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1289 zst->zst_rx_ready = 1; 1290 cs->cs_softreq = 1; 1291 } 1292 if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 1293 CLR(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 1294 zs_hwiflow(zst); 1295 } 1296 } else { 1297 zst->zst_r_hiwat = zstty_rbuf_hiwat; 1298 zst->zst_r_lowat = zstty_rbuf_lowat; 1299 } 1300 1301 /* 1302 * Force a recheck of the hardware carrier and flow control status, 1303 * since we may have changed which bits we're looking at. 1304 */ 1305 zstty_stint(cs, 1); 1306 1307 simple_unlock(&cs->cs_lock); 1308 splx(s); 1309 1310 /* 1311 * If hardware flow control is disabled, unblock any hard flow control 1312 * state. 1313 */ 1314 if (!ISSET(cflag, CHWFLOW)) { 1315 if (zst->zst_tx_stopped) { 1316 zst->zst_tx_stopped = 0; 1317 zsstart(tp); 1318 } 1319 } 1320 1321 zstty_softint(cs); 1322 1323 return (0); 1324} 1325 1326/* 1327 * Compute interrupt enable bits and set in the pending bits. Called both 1328 * in zsparam() and when PPS (pulse per second timing) state changes. 1329 * Must be called at splzs(). 1330 */ 1331static void 1332zs_maskintr(zst) 1333 struct zstty_softc *zst; 1334{ 1335 struct zs_chanstate *cs = zst->zst_cs; 1336 int tmp15; 1337 1338 cs->cs_rr0_mask = cs->cs_rr0_cts | cs->cs_rr0_dcd; 1339 if (zst->zst_ppsmask != 0) 1340 cs->cs_rr0_mask |= cs->cs_rr0_pps; 1341 tmp15 = cs->cs_preg[15]; 1342 if (ISSET(cs->cs_rr0_mask, ZSRR0_DCD)) 1343 SET(tmp15, ZSWR15_DCD_IE); 1344 else 1345 CLR(tmp15, ZSWR15_DCD_IE); 1346 if (ISSET(cs->cs_rr0_mask, ZSRR0_CTS)) 1347 SET(tmp15, ZSWR15_CTS_IE); 1348 else 1349 CLR(tmp15, ZSWR15_CTS_IE); 1350 cs->cs_preg[15] = tmp15; 1351} 1352 1353 1354/* 1355 * Raise or lower modem control (DTR/RTS) signals. If a character is 1356 * in transmission, the change is deferred. 1357 * Called at splzs() and with the channel lock held. 1358 */ 1359static void 1360zs_modem(zst, onoff) 1361 struct zstty_softc *zst; 1362 int onoff; 1363{ 1364 struct zs_chanstate *cs = zst->zst_cs, *ccs; 1365 1366 if (cs->cs_wr5_dtr == 0) 1367 return; 1368 1369 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs); 1370 1371 if (onoff) 1372 SET(ccs->cs_preg[5], cs->cs_wr5_dtr); 1373 else 1374 CLR(ccs->cs_preg[5], cs->cs_wr5_dtr); 1375 1376 if (!cs->cs_heldchange) { 1377 if (zst->zst_tx_busy) { 1378 zst->zst_heldtbc = zst->zst_tbc; 1379 zst->zst_tbc = 0; 1380 cs->cs_heldchange = 1; 1381 } else 1382 zs_loadchannelregs(cs); 1383 } 1384} 1385 1386/* 1387 * Set modem bits. 1388 * Called at splzs() and with the channel lock held. 1389 */ 1390static void 1391tiocm_to_zs(zst, how, ttybits) 1392 struct zstty_softc *zst; 1393 u_long how; 1394 int ttybits; 1395{ 1396 struct zs_chanstate *cs = zst->zst_cs, *ccs; 1397 u_char zsbits; 1398 1399 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs); 1400 1401 zsbits = 0; 1402 if (ISSET(ttybits, TIOCM_DTR)) 1403 SET(zsbits, ZSWR5_DTR); 1404 if (ISSET(ttybits, TIOCM_RTS)) 1405 SET(zsbits, ZSWR5_RTS); 1406 1407 switch (how) { 1408 case TIOCMBIC: 1409 CLR(ccs->cs_preg[5], zsbits); 1410 break; 1411 1412 case TIOCMBIS: 1413 SET(ccs->cs_preg[5], zsbits); 1414 break; 1415 1416 case TIOCMSET: 1417 CLR(ccs->cs_preg[5], ZSWR5_RTS | ZSWR5_DTR); 1418 SET(ccs->cs_preg[5], zsbits); 1419 break; 1420 } 1421 1422 if (!cs->cs_heldchange) { 1423 if (zst->zst_tx_busy) { 1424 zst->zst_heldtbc = zst->zst_tbc; 1425 zst->zst_tbc = 0; 1426 cs->cs_heldchange = 1; 1427 } else 1428 zs_loadchannelregs(cs); 1429 } 1430} 1431 1432/* 1433 * Get modem bits. 1434 * Called at splzs() and with the channel lock held. 1435 */ 1436static int 1437zs_to_tiocm(zst) 1438 struct zstty_softc *zst; 1439{ 1440 struct zs_chanstate *cs = zst->zst_cs, *ccs; 1441 u_char zsbits; 1442 int ttybits = 0; 1443 1444 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs); 1445 1446 zsbits = ccs->cs_preg[5]; 1447 if (ISSET(zsbits, ZSWR5_DTR)) 1448 SET(ttybits, TIOCM_DTR); 1449 if (ISSET(zsbits, ZSWR5_RTS)) 1450 SET(ttybits, TIOCM_RTS); 1451 1452 zsbits = cs->cs_rr0; 1453 if (ISSET(zsbits, ZSRR0_DCD)) 1454 SET(ttybits, TIOCM_CD); 1455 if (ISSET(zsbits, ZSRR0_CTS)) 1456 SET(ttybits, TIOCM_CTS); 1457 1458 return (ttybits); 1459} 1460 1461/* 1462 * Try to block or unblock input using hardware flow-control. 1463 * This is called by kern/tty.c if MDMBUF|CRTSCTS is set, and 1464 * if this function returns non-zero, the TS_TBLOCK flag will 1465 * be set or cleared according to the "block" arg passed. 1466 */ 1467int 1468zshwiflow(tp, block) 1469 struct tty *tp; 1470 int block; 1471{ 1472 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(tp->t_dev)); 1473 struct zs_chanstate *cs = zst->zst_cs; 1474 int s; 1475 1476 if (cs->cs_wr5_rts == 0) 1477 return (0); 1478 1479 s = splzs(); 1480 simple_lock(&cs->cs_lock); 1481 if (block) { 1482 if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1483 SET(zst->zst_rx_flags, RX_TTY_BLOCKED); 1484 zs_hwiflow(zst); 1485 } 1486 } else { 1487 if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1488 CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1489 zst->zst_rx_ready = 1; 1490 cs->cs_softreq = 1; 1491 } 1492 if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1493 CLR(zst->zst_rx_flags, RX_TTY_BLOCKED); 1494 zs_hwiflow(zst); 1495 } 1496 } 1497 simple_unlock(&cs->cs_lock); 1498 splx(s); 1499 return (1); 1500} 1501 1502/* 1503 * Internal version of zshwiflow 1504 * Called at splzs() and with the channel lock held. 1505 */ 1506static void 1507zs_hwiflow(zst) 1508 struct zstty_softc *zst; 1509{ 1510 struct zs_chanstate *cs = zst->zst_cs, *ccs; 1511 1512 if (cs->cs_wr5_rts == 0) 1513 return; 1514 1515 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs); 1516 1517 if (ISSET(zst->zst_rx_flags, RX_ANY_BLOCK)) { 1518 CLR(ccs->cs_preg[5], cs->cs_wr5_rts); 1519 CLR(ccs->cs_creg[5], cs->cs_wr5_rts); 1520 } else { 1521 SET(ccs->cs_preg[5], cs->cs_wr5_rts); 1522 SET(ccs->cs_creg[5], cs->cs_wr5_rts); 1523 } 1524 zs_write_reg(ccs, 5, ccs->cs_creg[5]); 1525} 1526 1527 1528/**************************************************************** 1529 * Interface to the lower layer (zscc) 1530 ****************************************************************/ 1531 1532#define integrate static inline 1533integrate void zstty_rxsoft(struct zstty_softc *, struct tty *); 1534integrate void zstty_txsoft(struct zstty_softc *, struct tty *); 1535integrate void zstty_stsoft(struct zstty_softc *, struct tty *); 1536static void zstty_diag(void *); 1537 1538/* 1539 * Receiver Ready interrupt. 1540 * Called at splzs() and with the channel lock held. 1541 */ 1542static void 1543zstty_rxint(cs) 1544 struct zs_chanstate *cs; 1545{ 1546 struct zstty_softc *zst = cs->cs_private; 1547 u_char *put, *end; 1548 u_int cc; 1549 u_char rr0, rr1, c; 1550 1551 end = zst->zst_ebuf; 1552 put = zst->zst_rbput; 1553 cc = zst->zst_rbavail; 1554 1555 while (cc > 0) { 1556 /* 1557 * First read the status, because reading the received char 1558 * destroys the status of this char. 1559 */ 1560 rr1 = zs_read_reg(cs, 1); 1561 c = zs_read_data(cs); 1562 1563 if (ISSET(rr1, ZSRR1_FE | ZSRR1_DO | ZSRR1_PE)) { 1564 /* Clear the receive error. */ 1565 zs_write_csr(cs, ZSWR0_RESET_ERRORS); 1566 } 1567 1568 cn_check_magic(zst->zst_tty->t_dev, c, zstty_cnm_state); 1569 put[0] = c; 1570 put[1] = rr1; 1571 put += 2; 1572 if (put >= end) 1573 put = zst->zst_rbuf; 1574 cc--; 1575 1576 rr0 = zs_read_csr(cs); 1577 if (!ISSET(rr0, ZSRR0_RX_READY)) 1578 break; 1579 } 1580 1581 /* 1582 * Current string of incoming characters ended because 1583 * no more data was available or we ran out of space. 1584 * Schedule a receive event if any data was received. 1585 * If we're out of space, turn off receive interrupts. 1586 */ 1587 zst->zst_rbput = put; 1588 zst->zst_rbavail = cc; 1589 if (!ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1590 zst->zst_rx_ready = 1; 1591 cs->cs_softreq = 1; 1592 } 1593 1594 /* 1595 * See if we are in danger of overflowing a buffer. If 1596 * so, use hardware flow control to ease the pressure. 1597 */ 1598 if (!ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED) && 1599 cc < zst->zst_r_hiwat) { 1600 SET(zst->zst_rx_flags, RX_IBUF_BLOCKED); 1601 zs_hwiflow(zst); 1602 } 1603 1604 /* 1605 * If we're out of space, disable receive interrupts 1606 * until the queue has drained a bit. 1607 */ 1608 if (!cc) { 1609 SET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED); 1610 CLR(cs->cs_preg[1], ZSWR1_RIE); 1611 cs->cs_creg[1] = cs->cs_preg[1]; 1612 zs_write_reg(cs, 1, cs->cs_creg[1]); 1613 } 1614 1615#if 0 1616 printf("%xH%04d\n", zst->zst_rx_flags, zst->zst_rbavail); 1617#endif 1618} 1619 1620/* 1621 * Transmitter Ready interrupt. 1622 * Called at splzs() and with the channel lock held. 1623 */ 1624static void 1625zstty_txint(cs) 1626 struct zs_chanstate *cs; 1627{ 1628 struct zstty_softc *zst = cs->cs_private; 1629 1630 /* 1631 * If we've delayed a parameter change, do it now, and restart 1632 * output. 1633 */ 1634 if (cs->cs_heldchange) { 1635 zs_loadchannelregs(cs); 1636 cs->cs_heldchange = 0; 1637 zst->zst_tbc = zst->zst_heldtbc; 1638 zst->zst_heldtbc = 0; 1639 } 1640 1641 /* Output the next character in the buffer, if any. */ 1642 if (zst->zst_tbc > 0) { 1643 zs_write_data(cs, *zst->zst_tba); 1644 zst->zst_tbc--; 1645 zst->zst_tba++; 1646 } else { 1647 /* Disable transmit completion interrupts if necessary. */ 1648 if (ISSET(cs->cs_preg[1], ZSWR1_TIE)) { 1649 CLR(cs->cs_preg[1], ZSWR1_TIE); 1650 cs->cs_creg[1] = cs->cs_preg[1]; 1651 zs_write_reg(cs, 1, cs->cs_creg[1]); 1652 } 1653 if (zst->zst_tx_busy) { 1654 zst->zst_tx_busy = 0; 1655 zst->zst_tx_done = 1; 1656 cs->cs_softreq = 1; 1657 } 1658 } 1659} 1660 1661/* 1662 * Status Change interrupt. 1663 * Called at splzs() and with the channel lock held. 1664 */ 1665static void 1666zstty_stint(cs, force) 1667 struct zs_chanstate *cs; 1668 int force; 1669{ 1670 struct zstty_softc *zst = cs->cs_private; 1671 u_char rr0, delta; 1672 1673 rr0 = zs_read_csr(cs); 1674 zs_write_csr(cs, ZSWR0_RESET_STATUS); 1675 1676 /* 1677 * Check here for console break, so that we can abort 1678 * even when interrupts are locking up the machine. 1679 */ 1680 if (ISSET(rr0, ZSRR0_BREAK)) 1681 cn_check_magic(zst->zst_tty->t_dev, CNC_BREAK, zstty_cnm_state); 1682 1683 if (!force) 1684 delta = rr0 ^ cs->cs_rr0; 1685 else 1686 delta = cs->cs_rr0_mask; 1687 cs->cs_rr0 = rr0; 1688 1689 if (ISSET(delta, cs->cs_rr0_mask)) { 1690 SET(cs->cs_rr0_delta, delta); 1691 1692 /* 1693 * Pulse-per-second clock signal on edge of DCD? 1694 */ 1695 if (ISSET(delta, zst->zst_ppsmask)) { 1696#ifdef __HAVE_TIMECOUNTER 1697 if (zst->zst_pps_state.ppsparam.mode & PPS_CAPTUREBOTH) { 1698 pps_capture(&zst->zst_pps_state); 1699 pps_event(&zst->zst_pps_state, 1700 (ISSET(cs->cs_rr0, zst->zst_ppsmask)) 1701 ? PPS_CAPTUREASSERT 1702 : PPS_CAPTURECLEAR); 1703 } 1704#else /* !__HAVE_TIMECOUNTER */ 1705 struct timeval tv; 1706 if (ISSET(rr0, zst->zst_ppsmask) == zst->zst_ppsassert) { 1707 /* XXX nanotime() */ 1708 microtime(&tv); 1709 TIMEVAL_TO_TIMESPEC(&tv, 1710 &zst->ppsinfo.assert_timestamp); 1711 if (zst->ppsparam.mode & PPS_OFFSETASSERT) { 1712 timespecadd(&zst->ppsinfo.assert_timestamp, 1713 &zst->ppsparam.assert_offset, 1714 &zst->ppsinfo.assert_timestamp); 1715 } 1716 1717#ifdef PPS_SYNC 1718 if (pps_kc_hardpps_source == zst && 1719 pps_kc_hardpps_mode & PPS_CAPTUREASSERT) { 1720 hardpps(&tv, tv.tv_usec); 1721 } 1722#endif 1723 zst->ppsinfo.assert_sequence++; 1724 zst->ppsinfo.current_mode = zst->ppsparam.mode; 1725 } else if (ISSET(rr0, zst->zst_ppsmask) == 1726 zst->zst_ppsclear) { 1727 /* XXX nanotime() */ 1728 microtime(&tv); 1729 TIMEVAL_TO_TIMESPEC(&tv, 1730 &zst->ppsinfo.clear_timestamp); 1731 if (zst->ppsparam.mode & PPS_OFFSETCLEAR) { 1732 timespecadd(&zst->ppsinfo.clear_timestamp, 1733 &zst->ppsparam.clear_offset, 1734 &zst->ppsinfo.clear_timestamp); 1735 } 1736 1737#ifdef PPS_SYNC 1738 if (pps_kc_hardpps_source == zst && 1739 pps_kc_hardpps_mode & PPS_CAPTURECLEAR) { 1740 hardpps(&tv, tv.tv_usec); 1741 } 1742#endif 1743 zst->ppsinfo.clear_sequence++; 1744 zst->ppsinfo.current_mode = zst->ppsparam.mode; 1745 } 1746#endif /* !__HAVE_TIMECOUNTER */ 1747 } 1748 1749 /* 1750 * Stop output immediately if we lose the output 1751 * flow control signal or carrier detect. 1752 */ 1753 if (ISSET(~rr0, cs->cs_rr0_mask)) { 1754 zst->zst_tbc = 0; 1755 zst->zst_heldtbc = 0; 1756 } 1757 1758 zst->zst_st_check = 1; 1759 cs->cs_softreq = 1; 1760 } 1761} 1762 1763void 1764zstty_diag(arg) 1765 void *arg; 1766{ 1767 struct zstty_softc *zst = arg; 1768 int overflows, floods; 1769 int s; 1770 1771 s = splzs(); 1772 overflows = zst->zst_overflows; 1773 zst->zst_overflows = 0; 1774 floods = zst->zst_floods; 1775 zst->zst_floods = 0; 1776 zst->zst_errors = 0; 1777 splx(s); 1778 1779 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1780 zst->zst_dev.dv_xname, 1781 overflows, overflows == 1 ? "" : "s", 1782 floods, floods == 1 ? "" : "s"); 1783} 1784 1785integrate void 1786zstty_rxsoft(zst, tp) 1787 struct zstty_softc *zst; 1788 struct tty *tp; 1789{ 1790 struct zs_chanstate *cs = zst->zst_cs; 1791 int (*rint)(int, struct tty *) = tp->t_linesw->l_rint; 1792 u_char *get, *end; 1793 u_int cc, scc; 1794 u_char rr1; 1795 int code; 1796 int s; 1797 1798 end = zst->zst_ebuf; 1799 get = zst->zst_rbget; 1800 scc = cc = zstty_rbuf_size - zst->zst_rbavail; 1801 1802 if (cc == zstty_rbuf_size) { 1803 zst->zst_floods++; 1804 if (zst->zst_errors++ == 0) 1805 callout_reset(&zst->zst_diag_ch, 60 * hz, 1806 zstty_diag, zst); 1807 } 1808 1809 /* If not yet open, drop the entire buffer content here */ 1810 if (!ISSET(tp->t_state, TS_ISOPEN)) { 1811 get += cc << 1; 1812 if (get >= end) 1813 get -= zstty_rbuf_size << 1; 1814 cc = 0; 1815 } 1816 while (cc) { 1817 code = get[0]; 1818 rr1 = get[1]; 1819 if (ISSET(rr1, ZSRR1_DO | ZSRR1_FE | ZSRR1_PE)) { 1820 if (ISSET(rr1, ZSRR1_DO)) { 1821 zst->zst_overflows++; 1822 if (zst->zst_errors++ == 0) 1823 callout_reset(&zst->zst_diag_ch, 1824 60 * hz, zstty_diag, zst); 1825 } 1826 if (ISSET(rr1, ZSRR1_FE)) 1827 SET(code, TTY_FE); 1828 if (ISSET(rr1, ZSRR1_PE)) 1829 SET(code, TTY_PE); 1830 } 1831 if ((*rint)(code, tp) == -1) { 1832 /* 1833 * The line discipline's buffer is out of space. 1834 */ 1835 if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1836 /* 1837 * We're either not using flow control, or the 1838 * line discipline didn't tell us to block for 1839 * some reason. Either way, we have no way to 1840 * know when there's more space available, so 1841 * just drop the rest of the data. 1842 */ 1843 get += cc << 1; 1844 if (get >= end) 1845 get -= zstty_rbuf_size << 1; 1846 cc = 0; 1847 } else { 1848 /* 1849 * Don't schedule any more receive processing 1850 * until the line discipline tells us there's 1851 * space available (through comhwiflow()). 1852 * Leave the rest of the data in the input 1853 * buffer. 1854 */ 1855 SET(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1856 } 1857 break; 1858 } 1859 get += 2; 1860 if (get >= end) 1861 get = zst->zst_rbuf; 1862 cc--; 1863 } 1864 1865 if (cc != scc) { 1866 zst->zst_rbget = get; 1867 s = splzs(); 1868 simple_lock(&cs->cs_lock); 1869 cc = zst->zst_rbavail += scc - cc; 1870 /* Buffers should be ok again, release possible block. */ 1871 if (cc >= zst->zst_r_lowat) { 1872 if (ISSET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED)) { 1873 CLR(zst->zst_rx_flags, RX_IBUF_OVERFLOWED); 1874 SET(cs->cs_preg[1], ZSWR1_RIE); 1875 cs->cs_creg[1] = cs->cs_preg[1]; 1876 zs_write_reg(cs, 1, cs->cs_creg[1]); 1877 } 1878 if (ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED)) { 1879 CLR(zst->zst_rx_flags, RX_IBUF_BLOCKED); 1880 zs_hwiflow(zst); 1881 } 1882 } 1883 simple_unlock(&cs->cs_lock); 1884 splx(s); 1885 } 1886 1887#if 0 1888 printf("%xS%04d\n", zst->zst_rx_flags, zst->zst_rbavail); 1889#endif 1890} 1891 1892integrate void 1893zstty_txsoft(zst, tp) 1894 struct zstty_softc *zst; 1895 struct tty *tp; 1896{ 1897 struct zs_chanstate *cs = zst->zst_cs; 1898 int s; 1899 1900 s = splzs(); 1901 simple_lock(&cs->cs_lock); 1902 CLR(tp->t_state, TS_BUSY); 1903 if (ISSET(tp->t_state, TS_FLUSH)) 1904 CLR(tp->t_state, TS_FLUSH); 1905 else 1906 ndflush(&tp->t_outq, (int)(zst->zst_tba - tp->t_outq.c_cf)); 1907 simple_unlock(&cs->cs_lock); 1908 splx(s); 1909 (*tp->t_linesw->l_start)(tp); 1910} 1911 1912integrate void 1913zstty_stsoft(zst, tp) 1914 struct zstty_softc *zst; 1915 struct tty *tp; 1916{ 1917 struct zs_chanstate *cs = zst->zst_cs; 1918 u_char rr0, delta; 1919 int s; 1920 1921 s = splzs(); 1922 simple_lock(&cs->cs_lock); 1923 rr0 = cs->cs_rr0; 1924 delta = cs->cs_rr0_delta; 1925 cs->cs_rr0_delta = 0; 1926 simple_unlock(&cs->cs_lock); 1927 splx(s); 1928 1929 if (ISSET(delta, cs->cs_rr0_dcd)) { 1930 /* 1931 * Inform the tty layer that carrier detect changed. 1932 */ 1933 (void) (*tp->t_linesw->l_modem)(tp, ISSET(rr0, ZSRR0_DCD)); 1934 } 1935 1936 if (ISSET(delta, cs->cs_rr0_cts)) { 1937 /* Block or unblock output according to flow control. */ 1938 if (ISSET(rr0, cs->cs_rr0_cts)) { 1939 zst->zst_tx_stopped = 0; 1940 (*tp->t_linesw->l_start)(tp); 1941 } else { 1942 zst->zst_tx_stopped = 1; 1943 } 1944 } 1945} 1946 1947/* 1948 * Software interrupt. Called at zssoft 1949 * 1950 * The main job to be done here is to empty the input ring 1951 * by passing its contents up to the tty layer. The ring is 1952 * always emptied during this operation, therefore the ring 1953 * must not be larger than the space after "high water" in 1954 * the tty layer, or the tty layer might drop our input. 1955 * 1956 * Note: an "input blockage" condition is assumed to exist if 1957 * EITHER the TS_TBLOCK flag or zst_rx_blocked flag is set. 1958 */ 1959static void 1960zstty_softint(cs) 1961 struct zs_chanstate *cs; 1962{ 1963 struct zstty_softc *zst = cs->cs_private; 1964 struct tty *tp = zst->zst_tty; 1965 int s; 1966 1967 s = spltty(); 1968 1969 if (zst->zst_rx_ready) { 1970 zst->zst_rx_ready = 0; 1971 zstty_rxsoft(zst, tp); 1972 } 1973 1974 if (zst->zst_st_check) { 1975 zst->zst_st_check = 0; 1976 zstty_stsoft(zst, tp); 1977 } 1978 1979 if (zst->zst_tx_done) { 1980 zst->zst_tx_done = 0; 1981 zstty_txsoft(zst, tp); 1982 } 1983 1984 splx(s); 1985} 1986 1987struct zsops zsops_tty = { 1988 zstty_rxint, /* receive char available */ 1989 zstty_stint, /* external/status */ 1990 zstty_txint, /* xmit buffer empty */ 1991 zstty_softint, /* process software interrupt */ 1992}; 1993 1994#ifdef ZS_TXDMA 1995void 1996zstty_txdma_int(arg) 1997 void *arg; 1998{ 1999 struct zs_chanstate *cs = arg; 2000 struct zstty_softc *zst = cs->cs_private; 2001 2002 zst->zst_tba += zst->zst_tbc; 2003 zst->zst_tbc = 0; 2004 2005 if (zst->zst_tx_busy) { 2006 zst->zst_tx_busy = 0; 2007 zst->zst_tx_done = 1; 2008 cs->cs_softreq = 1; 2009 } 2010} 2011#endif 2012