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sys/dev/ic/z8530tty.c
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1 /* $NetBSD: z8530tty.c,v 1.112 2006/10/01 20:31:50 elad 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 1.112 2006/10/01 20:31:50 elad 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 175 176 static 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 */ 181 u_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. */ 184 u_int zstty_rbuf_hiwat = (ZSTTY_RING_SIZE * 1) / 4; 185 u_int zstty_rbuf_lowat = (ZSTTY_RING_SIZE * 3) / 4; 186 187 #ifndef __HAVE_TIMECOUNTER 188 static int zsppscap = 189 PPS_TSFMT_TSPEC | 190 PPS_CAPTUREASSERT | 191 PPS_CAPTURECLEAR | 192 PPS_OFFSETASSERT | PPS_OFFSETCLEAR; 193 #endif /* __HAVE_TIMECOUNTER */ 194 195 struct 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. */ 253 static int zstty_match(struct device *, struct cfdata *, void *); 254 static void zstty_attach(struct device *, struct device *, void *); 255 256 CFATTACH_DECL(zstty, sizeof(struct zstty_softc), 257 zstty_match, zstty_attach, NULL, NULL); 258 259 extern struct cfdriver zstty_cd; 260 261 dev_type_open(zsopen); 262 dev_type_close(zsclose); 263 dev_type_read(zsread); 264 dev_type_write(zswrite); 265 dev_type_ioctl(zsioctl); 266 dev_type_stop(zsstop); 267 dev_type_tty(zstty); 268 dev_type_poll(zspoll); 269 270 const struct cdevsw zstty_cdevsw = { 271 zsopen, zsclose, zsread, zswrite, zsioctl, 272 zsstop, zstty, zspoll, nommap, ttykqfilter, D_TTY 273 }; 274 275 struct zsops zsops_tty; 276 277 static void zs_shutdown(struct zstty_softc *); 278 static void zsstart(struct tty *); 279 static int zsparam(struct tty *, struct termios *); 280 static void zs_modem(struct zstty_softc *, int); 281 static void tiocm_to_zs(struct zstty_softc *, u_long, int); 282 static int zs_to_tiocm(struct zstty_softc *); 283 static int zshwiflow(struct tty *, int); 284 static void zs_hwiflow(struct zstty_softc *); 285 static void zs_maskintr(struct zstty_softc *); 286 287 /* Low-level routines. */ 288 static void zstty_rxint (struct zs_chanstate *); 289 static void zstty_stint (struct zs_chanstate *, int); 290 static void zstty_txint (struct zs_chanstate *); 291 static void zstty_softint(struct zs_chanstate *); 292 293 #define ZSUNIT(x) (minor(x) & 0x7ffff) 294 #define ZSDIALOUT(x) (minor(x) & 0x80000) 295 296 struct 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 */ 303 304 struct tty * 305 zstty_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 */ 315 int 316 zstty_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 } 333 334 void 335 zstty_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 */ 488 struct tty * 489 zstty(dev) 490 dev_t dev; 491 { 492 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 493 494 return (zst->zst_tty); 495 } 496 497 498 void 499 zs_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 */ 566 int 567 zsopen(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 (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp)) 591 return (EBUSY); 592 593 s = spltty(); 594 595 /* 596 * Do the following iff this is a first open. 597 */ 598 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 599 struct termios t; 600 601 tp->t_dev = dev; 602 603 /* Call the power management hook. */ 604 if (cs->enable) { 605 if ((*cs->enable)(cs)) { 606 splx(s); 607 printf("%s: device enable failed\n", 608 zst->zst_dev.dv_xname); 609 return (EIO); 610 } 611 } 612 613 /* 614 * Initialize the termios status to the defaults. Add in the 615 * sticky bits from TIOCSFLAGS. 616 */ 617 t.c_ispeed = 0; 618 t.c_ospeed = cs->cs_defspeed; 619 t.c_cflag = cs->cs_defcflag; 620 if (ISSET(zst->zst_swflags, TIOCFLAG_CLOCAL)) 621 SET(t.c_cflag, CLOCAL); 622 if (ISSET(zst->zst_swflags, TIOCFLAG_CRTSCTS)) 623 SET(t.c_cflag, CRTSCTS); 624 if (ISSET(zst->zst_swflags, TIOCFLAG_CDTRCTS)) 625 SET(t.c_cflag, CDTRCTS); 626 if (ISSET(zst->zst_swflags, TIOCFLAG_MDMBUF)) 627 SET(t.c_cflag, MDMBUF); 628 629 s2 = splzs(); 630 simple_lock(&cs->cs_lock); 631 632 /* 633 * Turn on receiver and status interrupts. 634 * We defer the actual write of the register to zsparam(), 635 * but we must make sure status interrupts are turned on by 636 * the time zsparam() reads the initial rr0 state. 637 */ 638 SET(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE); 639 640 /* Clear PPS capture state on first open. */ 641 zst->zst_ppsmask = 0; 642 #ifdef __HAVE_TIMECOUNTER 643 memset(&zst->zst_pps_state, 0, sizeof(zst->zst_pps_state)); 644 zst->zst_pps_state.ppscap = PPS_CAPTUREASSERT | PPS_CAPTURECLEAR; 645 pps_init(&zst->zst_pps_state); 646 #else /* !__HAVE_TIMECOUNTER */ 647 zst->ppsparam.mode = 0; 648 #endif /* !__HAVE_TIMECOUNTER */ 649 650 simple_unlock(&cs->cs_lock); 651 splx(s2); 652 653 /* Make sure zsparam will see changes. */ 654 tp->t_ospeed = 0; 655 (void) zsparam(tp, &t); 656 657 /* 658 * Note: zsparam has done: cflag, ispeed, ospeed 659 * so we just need to do: iflag, oflag, lflag, cc 660 * For "raw" mode, just leave all zeros. 661 */ 662 if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_RAW)) { 663 tp->t_iflag = TTYDEF_IFLAG; 664 tp->t_oflag = TTYDEF_OFLAG; 665 tp->t_lflag = TTYDEF_LFLAG; 666 } else { 667 tp->t_iflag = 0; 668 tp->t_oflag = 0; 669 tp->t_lflag = 0; 670 } 671 ttychars(tp); 672 ttsetwater(tp); 673 674 s2 = splzs(); 675 simple_lock(&cs->cs_lock); 676 677 /* 678 * Turn on DTR. We must always do this, even if carrier is not 679 * present, because otherwise we'd have to use TIOCSDTR 680 * immediately after setting CLOCAL, which applications do not 681 * expect. We always assert DTR while the device is open 682 * unless explicitly requested to deassert it. 683 */ 684 zs_modem(zst, 1); 685 686 /* Clear the input ring, and unblock. */ 687 zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf; 688 zst->zst_rbavail = zstty_rbuf_size; 689 zs_iflush(cs); 690 CLR(zst->zst_rx_flags, RX_ANY_BLOCK); 691 zs_hwiflow(zst); 692 693 simple_unlock(&cs->cs_lock); 694 splx(s2); 695 } 696 697 splx(s); 698 699 error = ttyopen(tp, ZSDIALOUT(dev), ISSET(flags, O_NONBLOCK)); 700 if (error) 701 goto bad; 702 703 error = (*tp->t_linesw->l_open)(dev, tp); 704 if (error) 705 goto bad; 706 707 return (0); 708 709 bad: 710 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 711 /* 712 * We failed to open the device, and nobody else had it opened. 713 * Clean up the state as appropriate. 714 */ 715 zs_shutdown(zst); 716 } 717 718 return (error); 719 } 720 721 /* 722 * Close a zs serial port. 723 */ 724 int 725 zsclose(dev, flags, mode, l) 726 dev_t dev; 727 int flags; 728 int mode; 729 struct lwp *l; 730 { 731 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 732 struct tty *tp = zst->zst_tty; 733 734 /* XXX This is for cons.c. */ 735 if (!ISSET(tp->t_state, TS_ISOPEN)) 736 return 0; 737 738 (*tp->t_linesw->l_close)(tp, flags); 739 ttyclose(tp); 740 741 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 742 /* 743 * Although we got a last close, the device may still be in 744 * use; e.g. if this was the dialout node, and there are still 745 * processes waiting for carrier on the non-dialout node. 746 */ 747 zs_shutdown(zst); 748 } 749 750 return (0); 751 } 752 753 /* 754 * Read/write zs serial port. 755 */ 756 int 757 zsread(dev, uio, flags) 758 dev_t dev; 759 struct uio *uio; 760 int flags; 761 { 762 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 763 struct tty *tp = zst->zst_tty; 764 765 return ((*tp->t_linesw->l_read)(tp, uio, flags)); 766 } 767 768 int 769 zswrite(dev, uio, flags) 770 dev_t dev; 771 struct uio *uio; 772 int flags; 773 { 774 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 775 struct tty *tp = zst->zst_tty; 776 777 return ((*tp->t_linesw->l_write)(tp, uio, flags)); 778 } 779 780 int 781 zspoll(dev, events, l) 782 dev_t dev; 783 int events; 784 struct lwp *l; 785 { 786 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 787 struct tty *tp = zst->zst_tty; 788 789 return ((*tp->t_linesw->l_poll)(tp, events, l)); 790 } 791 792 int 793 zsioctl(dev, cmd, data, flag, l) 794 dev_t dev; 795 u_long cmd; 796 caddr_t data; 797 int flag; 798 struct lwp *l; 799 { 800 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 801 struct zs_chanstate *cs = zst->zst_cs; 802 struct tty *tp = zst->zst_tty; 803 int error; 804 int s; 805 806 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 807 if (error != EPASSTHROUGH) 808 return (error); 809 810 error = ttioctl(tp, cmd, data, flag, l); 811 if (error != EPASSTHROUGH) 812 return (error); 813 814 #ifdef ZS_MD_IOCTL 815 error = ZS_MD_IOCTL(cs, cmd, data); 816 if (error != EPASSTHROUGH) 817 return (error); 818 #endif /* ZS_MD_IOCTL */ 819 820 error = 0; 821 822 s = splzs(); 823 simple_lock(&cs->cs_lock); 824 825 switch (cmd) { 826 case TIOCSBRK: 827 zs_break(cs, 1); 828 break; 829 830 case TIOCCBRK: 831 zs_break(cs, 0); 832 break; 833 834 case TIOCGFLAGS: 835 *(int *)data = zst->zst_swflags; 836 break; 837 838 case TIOCSFLAGS: 839 error = kauth_authorize_device_tty(l->l_cred, 840 KAUTH_DEVICE_TTY_PRIVSET, tp); 841 if (error) 842 break; 843 zst->zst_swflags = *(int *)data; 844 break; 845 846 case TIOCSDTR: 847 zs_modem(zst, 1); 848 break; 849 850 case TIOCCDTR: 851 zs_modem(zst, 0); 852 break; 853 854 case TIOCMSET: 855 case TIOCMBIS: 856 case TIOCMBIC: 857 tiocm_to_zs(zst, cmd, *(int *)data); 858 break; 859 860 case TIOCMGET: 861 *(int *)data = zs_to_tiocm(zst); 862 break; 863 864 #ifdef __HAVE_TIMECOUNTER 865 case PPS_IOC_CREATE: 866 case PPS_IOC_DESTROY: 867 case PPS_IOC_GETPARAMS: 868 case PPS_IOC_SETPARAMS: 869 case PPS_IOC_GETCAP: 870 case PPS_IOC_FETCH: 871 #ifdef PPS_SYNC 872 case PPS_IOC_KCBIND: 873 #endif 874 error = pps_ioctl(cmd, data, &zst->zst_pps_state); 875 if (zst->zst_pps_state.ppsparam.mode & PPS_CAPTUREBOTH) 876 zst->zst_ppsmask = ZSRR0_DCD; 877 else 878 zst->zst_ppsmask = 0; 879 break; 880 #else /* !__HAVE_TIMECOUNTER */ 881 case PPS_IOC_CREATE: 882 break; 883 884 case PPS_IOC_DESTROY: 885 break; 886 887 case PPS_IOC_GETPARAMS: { 888 pps_params_t *pp; 889 pp = (pps_params_t *)data; 890 *pp = zst->ppsparam; 891 break; 892 } 893 894 case PPS_IOC_SETPARAMS: { 895 pps_params_t *pp; 896 int mode; 897 if (cs->cs_rr0_pps == 0) { 898 error = EINVAL; 899 break; 900 } 901 pp = (pps_params_t *)data; 902 if (pp->mode & ~zsppscap) { 903 error = EINVAL; 904 break; 905 } 906 zst->ppsparam = *pp; 907 /* 908 * compute masks from user-specified timestamp state. 909 */ 910 mode = zst->ppsparam.mode; 911 switch (mode & PPS_CAPTUREBOTH) { 912 case 0: 913 zst->zst_ppsmask = 0; 914 break; 915 916 case PPS_CAPTUREASSERT: 917 zst->zst_ppsmask = ZSRR0_DCD; 918 zst->zst_ppsassert = ZSRR0_DCD; 919 zst->zst_ppsclear = -1; 920 break; 921 922 case PPS_CAPTURECLEAR: 923 zst->zst_ppsmask = ZSRR0_DCD; 924 zst->zst_ppsassert = -1; 925 zst->zst_ppsclear = 0; 926 break; 927 928 case PPS_CAPTUREBOTH: 929 zst->zst_ppsmask = ZSRR0_DCD; 930 zst->zst_ppsassert = ZSRR0_DCD; 931 zst->zst_ppsclear = 0; 932 break; 933 934 default: 935 error = EINVAL; 936 break; 937 } 938 939 /* 940 * Now update interrupts. 941 */ 942 zs_maskintr(zst); 943 /* 944 * If nothing is being transmitted, set up new current values, 945 * else mark them as pending. 946 */ 947 if (!cs->cs_heldchange) { 948 if (zst->zst_tx_busy) { 949 zst->zst_heldtbc = zst->zst_tbc; 950 zst->zst_tbc = 0; 951 cs->cs_heldchange = 1; 952 } else 953 zs_loadchannelregs(cs); 954 } 955 956 break; 957 } 958 959 case PPS_IOC_GETCAP: 960 *(int *)data = zsppscap; 961 break; 962 963 case PPS_IOC_FETCH: { 964 pps_info_t *pi; 965 pi = (pps_info_t *)data; 966 *pi = zst->ppsinfo; 967 break; 968 } 969 970 #ifdef PPS_SYNC 971 case PPS_IOC_KCBIND: { 972 int edge = (*(int *)data) & PPS_CAPTUREBOTH; 973 974 if (edge == 0) { 975 /* 976 * remove binding for this source; ignore 977 * the request if this is not the current 978 * hardpps source 979 */ 980 if (pps_kc_hardpps_source == zst) { 981 pps_kc_hardpps_source = NULL; 982 pps_kc_hardpps_mode = 0; 983 } 984 } else { 985 /* 986 * bind hardpps to this source, replacing any 987 * previously specified source or edges 988 */ 989 pps_kc_hardpps_source = zst; 990 pps_kc_hardpps_mode = edge; 991 } 992 break; 993 } 994 #endif /* PPS_SYNC */ 995 #endif /* !__HAVE_TIMECOUNTER */ 996 997 case TIOCDCDTIMESTAMP: /* XXX old, overloaded API used by xntpd v3 */ 998 if (cs->cs_rr0_pps == 0) { 999 error = EINVAL; 1000 break; 1001 } 1002 #ifdef __HAVE_TIMECOUNTER 1003 #ifndef PPS_TRAILING_EDGE 1004 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 1005 &zst->zst_pps_state.ppsinfo.assert_timestamp); 1006 #else 1007 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 1008 &zst->zst_pps_state.ppsinfo.clear_timestamp); 1009 #endif 1010 #else /* !__HAVE_TIMECOUNTER */ 1011 zst->zst_ppsmask = ZSRR0_DCD; 1012 #ifndef PPS_TRAILING_EDGE 1013 zst->zst_ppsassert = ZSRR0_DCD; 1014 zst->zst_ppsclear = -1; 1015 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 1016 &zst->ppsinfo.assert_timestamp); 1017 #else 1018 zst->zst_ppsassert = -1; 1019 zst->zst_ppsclear = 01; 1020 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 1021 &zst->ppsinfo.clear_timestamp); 1022 #endif 1023 #endif /* !__HAVE_TIMECOUNTER */ 1024 /* 1025 * Now update interrupts. 1026 */ 1027 zs_maskintr(zst); 1028 /* 1029 * If nothing is being transmitted, set up new current values, 1030 * else mark them as pending. 1031 */ 1032 if (!cs->cs_heldchange) { 1033 if (zst->zst_tx_busy) { 1034 zst->zst_heldtbc = zst->zst_tbc; 1035 zst->zst_tbc = 0; 1036 cs->cs_heldchange = 1; 1037 } else 1038 zs_loadchannelregs(cs); 1039 } 1040 1041 break; 1042 1043 default: 1044 error = EPASSTHROUGH; 1045 break; 1046 } 1047 1048 simple_unlock(&cs->cs_lock); 1049 splx(s); 1050 1051 return (error); 1052 } 1053 1054 /* 1055 * Start or restart transmission. 1056 */ 1057 static void 1058 zsstart(tp) 1059 struct tty *tp; 1060 { 1061 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(tp->t_dev)); 1062 struct zs_chanstate *cs = zst->zst_cs; 1063 u_char *tba; 1064 int s, tbc; 1065 1066 s = spltty(); 1067 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 1068 goto out; 1069 if (zst->zst_tx_stopped) 1070 goto out; 1071 1072 if (tp->t_outq.c_cc <= tp->t_lowat) { 1073 if (ISSET(tp->t_state, TS_ASLEEP)) { 1074 CLR(tp->t_state, TS_ASLEEP); 1075 wakeup((caddr_t)&tp->t_outq); 1076 } 1077 selwakeup(&tp->t_wsel); 1078 if (tp->t_outq.c_cc == 0) 1079 goto out; 1080 } 1081 1082 /* Grab the first contiguous region of buffer space. */ 1083 tba = tp->t_outq.c_cf; 1084 tbc = ndqb(&tp->t_outq, 0); 1085 1086 (void) splzs(); 1087 simple_lock(&cs->cs_lock); 1088 1089 zst->zst_tba = tba; 1090 zst->zst_tbc = tbc; 1091 SET(tp->t_state, TS_BUSY); 1092 zst->zst_tx_busy = 1; 1093 1094 #ifdef ZS_TXDMA 1095 if (zst->zst_tbc > 1) { 1096 zs_dma_setup(cs, zst->zst_tba, zst->zst_tbc); 1097 goto out; 1098 } 1099 #endif 1100 1101 /* Enable transmit completion interrupts if necessary. */ 1102 if (!ISSET(cs->cs_preg[1], ZSWR1_TIE)) { 1103 SET(cs->cs_preg[1], ZSWR1_TIE); 1104 cs->cs_creg[1] = cs->cs_preg[1]; 1105 zs_write_reg(cs, 1, cs->cs_creg[1]); 1106 } 1107 1108 /* Output the first character of the contiguous buffer. */ 1109 zs_write_data(cs, *zst->zst_tba); 1110 zst->zst_tbc--; 1111 zst->zst_tba++; 1112 1113 simple_unlock(&cs->cs_lock); 1114 out: 1115 splx(s); 1116 return; 1117 } 1118 1119 /* 1120 * Stop output, e.g., for ^S or output flush. 1121 */ 1122 void 1123 zsstop(tp, flag) 1124 struct tty *tp; 1125 int flag; 1126 { 1127 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(tp->t_dev)); 1128 int s; 1129 1130 s = splzs(); 1131 if (ISSET(tp->t_state, TS_BUSY)) { 1132 /* Stop transmitting at the next chunk. */ 1133 zst->zst_tbc = 0; 1134 zst->zst_heldtbc = 0; 1135 if (!ISSET(tp->t_state, TS_TTSTOP)) 1136 SET(tp->t_state, TS_FLUSH); 1137 } 1138 splx(s); 1139 } 1140 1141 /* 1142 * Set ZS tty parameters from termios. 1143 * XXX - Should just copy the whole termios after 1144 * making sure all the changes could be done. 1145 */ 1146 static int 1147 zsparam(tp, t) 1148 struct tty *tp; 1149 struct termios *t; 1150 { 1151 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(tp->t_dev)); 1152 struct zs_chanstate *cs = zst->zst_cs; 1153 int ospeed; 1154 tcflag_t cflag; 1155 u_char tmp3, tmp4, tmp5; 1156 int s, error; 1157 1158 ospeed = t->c_ospeed; 1159 cflag = t->c_cflag; 1160 1161 /* Check requested parameters. */ 1162 if (ospeed < 0) 1163 return (EINVAL); 1164 if (t->c_ispeed && t->c_ispeed != ospeed) 1165 return (EINVAL); 1166 1167 /* 1168 * For the console, always force CLOCAL and !HUPCL, so that the port 1169 * is always active. 1170 */ 1171 if (ISSET(zst->zst_swflags, TIOCFLAG_SOFTCAR) || 1172 ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 1173 SET(cflag, CLOCAL); 1174 CLR(cflag, HUPCL); 1175 } 1176 1177 /* 1178 * Only whack the UART when params change. 1179 * Some callers need to clear tp->t_ospeed 1180 * to make sure initialization gets done. 1181 */ 1182 if (tp->t_ospeed == ospeed && 1183 tp->t_cflag == cflag) 1184 return (0); 1185 1186 /* 1187 * Call MD functions to deal with changed 1188 * clock modes or H/W flow control modes. 1189 * The BRG divisor is set now. (reg 12,13) 1190 */ 1191 error = zs_set_speed(cs, ospeed); 1192 if (error) 1193 return (error); 1194 error = zs_set_modes(cs, cflag); 1195 if (error) 1196 return (error); 1197 1198 /* 1199 * Block interrupts so that state will not 1200 * be altered until we are done setting it up. 1201 * 1202 * Initial values in cs_preg are set before 1203 * our attach routine is called. The master 1204 * interrupt enable is handled by zsc.c 1205 * 1206 */ 1207 s = splzs(); 1208 simple_lock(&cs->cs_lock); 1209 1210 /* 1211 * Recalculate which status ints to enable. 1212 */ 1213 zs_maskintr(zst); 1214 1215 /* Recompute character size bits. */ 1216 tmp3 = cs->cs_preg[3]; 1217 tmp5 = cs->cs_preg[5]; 1218 CLR(tmp3, ZSWR3_RXSIZE); 1219 CLR(tmp5, ZSWR5_TXSIZE); 1220 switch (ISSET(cflag, CSIZE)) { 1221 case CS5: 1222 SET(tmp3, ZSWR3_RX_5); 1223 SET(tmp5, ZSWR5_TX_5); 1224 break; 1225 case CS6: 1226 SET(tmp3, ZSWR3_RX_6); 1227 SET(tmp5, ZSWR5_TX_6); 1228 break; 1229 case CS7: 1230 SET(tmp3, ZSWR3_RX_7); 1231 SET(tmp5, ZSWR5_TX_7); 1232 break; 1233 case CS8: 1234 SET(tmp3, ZSWR3_RX_8); 1235 SET(tmp5, ZSWR5_TX_8); 1236 break; 1237 } 1238 cs->cs_preg[3] = tmp3; 1239 cs->cs_preg[5] = tmp5; 1240 1241 /* 1242 * Recompute the stop bits and parity bits. Note that 1243 * zs_set_speed() may have set clock selection bits etc. 1244 * in wr4, so those must preserved. 1245 */ 1246 tmp4 = cs->cs_preg[4]; 1247 CLR(tmp4, ZSWR4_SBMASK | ZSWR4_PARMASK); 1248 if (ISSET(cflag, CSTOPB)) 1249 SET(tmp4, ZSWR4_TWOSB); 1250 else 1251 SET(tmp4, ZSWR4_ONESB); 1252 if (!ISSET(cflag, PARODD)) 1253 SET(tmp4, ZSWR4_EVENP); 1254 if (ISSET(cflag, PARENB)) 1255 SET(tmp4, ZSWR4_PARENB); 1256 cs->cs_preg[4] = tmp4; 1257 1258 /* And copy to tty. */ 1259 tp->t_ispeed = 0; 1260 tp->t_ospeed = ospeed; 1261 tp->t_cflag = cflag; 1262 1263 /* 1264 * If nothing is being transmitted, set up new current values, 1265 * else mark them as pending. 1266 */ 1267 if (!cs->cs_heldchange) { 1268 if (zst->zst_tx_busy) { 1269 zst->zst_heldtbc = zst->zst_tbc; 1270 zst->zst_tbc = 0; 1271 cs->cs_heldchange = 1; 1272 } else 1273 zs_loadchannelregs(cs); 1274 } 1275 1276 /* 1277 * If hardware flow control is disabled, turn off the buffer water 1278 * marks and unblock any soft flow control state. Otherwise, enable 1279 * the water marks. 1280 */ 1281 if (!ISSET(cflag, CHWFLOW)) { 1282 zst->zst_r_hiwat = 0; 1283 zst->zst_r_lowat = 0; 1284 if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1285 CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1286 zst->zst_rx_ready = 1; 1287 cs->cs_softreq = 1; 1288 } 1289 if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 1290 CLR(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 1291 zs_hwiflow(zst); 1292 } 1293 } else { 1294 zst->zst_r_hiwat = zstty_rbuf_hiwat; 1295 zst->zst_r_lowat = zstty_rbuf_lowat; 1296 } 1297 1298 /* 1299 * Force a recheck of the hardware carrier and flow control status, 1300 * since we may have changed which bits we're looking at. 1301 */ 1302 zstty_stint(cs, 1); 1303 1304 simple_unlock(&cs->cs_lock); 1305 splx(s); 1306 1307 /* 1308 * If hardware flow control is disabled, unblock any hard flow control 1309 * state. 1310 */ 1311 if (!ISSET(cflag, CHWFLOW)) { 1312 if (zst->zst_tx_stopped) { 1313 zst->zst_tx_stopped = 0; 1314 zsstart(tp); 1315 } 1316 } 1317 1318 zstty_softint(cs); 1319 1320 return (0); 1321 } 1322 1323 /* 1324 * Compute interrupt enable bits and set in the pending bits. Called both 1325 * in zsparam() and when PPS (pulse per second timing) state changes. 1326 * Must be called at splzs(). 1327 */ 1328 static void 1329 zs_maskintr(zst) 1330 struct zstty_softc *zst; 1331 { 1332 struct zs_chanstate *cs = zst->zst_cs; 1333 int tmp15; 1334 1335 cs->cs_rr0_mask = cs->cs_rr0_cts | cs->cs_rr0_dcd; 1336 if (zst->zst_ppsmask != 0) 1337 cs->cs_rr0_mask |= cs->cs_rr0_pps; 1338 tmp15 = cs->cs_preg[15]; 1339 if (ISSET(cs->cs_rr0_mask, ZSRR0_DCD)) 1340 SET(tmp15, ZSWR15_DCD_IE); 1341 else 1342 CLR(tmp15, ZSWR15_DCD_IE); 1343 if (ISSET(cs->cs_rr0_mask, ZSRR0_CTS)) 1344 SET(tmp15, ZSWR15_CTS_IE); 1345 else 1346 CLR(tmp15, ZSWR15_CTS_IE); 1347 cs->cs_preg[15] = tmp15; 1348 } 1349 1350 1351 /* 1352 * Raise or lower modem control (DTR/RTS) signals. If a character is 1353 * in transmission, the change is deferred. 1354 * Called at splzs() and with the channel lock held. 1355 */ 1356 static void 1357 zs_modem(zst, onoff) 1358 struct zstty_softc *zst; 1359 int onoff; 1360 { 1361 struct zs_chanstate *cs = zst->zst_cs, *ccs; 1362 1363 if (cs->cs_wr5_dtr == 0) 1364 return; 1365 1366 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs); 1367 1368 if (onoff) 1369 SET(ccs->cs_preg[5], cs->cs_wr5_dtr); 1370 else 1371 CLR(ccs->cs_preg[5], cs->cs_wr5_dtr); 1372 1373 if (!cs->cs_heldchange) { 1374 if (zst->zst_tx_busy) { 1375 zst->zst_heldtbc = zst->zst_tbc; 1376 zst->zst_tbc = 0; 1377 cs->cs_heldchange = 1; 1378 } else 1379 zs_loadchannelregs(cs); 1380 } 1381 } 1382 1383 /* 1384 * Set modem bits. 1385 * Called at splzs() and with the channel lock held. 1386 */ 1387 static void 1388 tiocm_to_zs(zst, how, ttybits) 1389 struct zstty_softc *zst; 1390 u_long how; 1391 int ttybits; 1392 { 1393 struct zs_chanstate *cs = zst->zst_cs, *ccs; 1394 u_char zsbits; 1395 1396 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs); 1397 1398 zsbits = 0; 1399 if (ISSET(ttybits, TIOCM_DTR)) 1400 SET(zsbits, ZSWR5_DTR); 1401 if (ISSET(ttybits, TIOCM_RTS)) 1402 SET(zsbits, ZSWR5_RTS); 1403 1404 switch (how) { 1405 case TIOCMBIC: 1406 CLR(ccs->cs_preg[5], zsbits); 1407 break; 1408 1409 case TIOCMBIS: 1410 SET(ccs->cs_preg[5], zsbits); 1411 break; 1412 1413 case TIOCMSET: 1414 CLR(ccs->cs_preg[5], ZSWR5_RTS | ZSWR5_DTR); 1415 SET(ccs->cs_preg[5], zsbits); 1416 break; 1417 } 1418 1419 if (!cs->cs_heldchange) { 1420 if (zst->zst_tx_busy) { 1421 zst->zst_heldtbc = zst->zst_tbc; 1422 zst->zst_tbc = 0; 1423 cs->cs_heldchange = 1; 1424 } else 1425 zs_loadchannelregs(cs); 1426 } 1427 } 1428 1429 /* 1430 * Get modem bits. 1431 * Called at splzs() and with the channel lock held. 1432 */ 1433 static int 1434 zs_to_tiocm(zst) 1435 struct zstty_softc *zst; 1436 { 1437 struct zs_chanstate *cs = zst->zst_cs, *ccs; 1438 u_char zsbits; 1439 int ttybits = 0; 1440 1441 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs); 1442 1443 zsbits = ccs->cs_preg[5]; 1444 if (ISSET(zsbits, ZSWR5_DTR)) 1445 SET(ttybits, TIOCM_DTR); 1446 if (ISSET(zsbits, ZSWR5_RTS)) 1447 SET(ttybits, TIOCM_RTS); 1448 1449 zsbits = cs->cs_rr0; 1450 if (ISSET(zsbits, ZSRR0_DCD)) 1451 SET(ttybits, TIOCM_CD); 1452 if (ISSET(zsbits, ZSRR0_CTS)) 1453 SET(ttybits, TIOCM_CTS); 1454 1455 return (ttybits); 1456 } 1457 1458 /* 1459 * Try to block or unblock input using hardware flow-control. 1460 * This is called by kern/tty.c if MDMBUF|CRTSCTS is set, and 1461 * if this function returns non-zero, the TS_TBLOCK flag will 1462 * be set or cleared according to the "block" arg passed. 1463 */ 1464 int 1465 zshwiflow(tp, block) 1466 struct tty *tp; 1467 int block; 1468 { 1469 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(tp->t_dev)); 1470 struct zs_chanstate *cs = zst->zst_cs; 1471 int s; 1472 1473 if (cs->cs_wr5_rts == 0) 1474 return (0); 1475 1476 s = splzs(); 1477 simple_lock(&cs->cs_lock); 1478 if (block) { 1479 if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1480 SET(zst->zst_rx_flags, RX_TTY_BLOCKED); 1481 zs_hwiflow(zst); 1482 } 1483 } else { 1484 if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1485 CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1486 zst->zst_rx_ready = 1; 1487 cs->cs_softreq = 1; 1488 } 1489 if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1490 CLR(zst->zst_rx_flags, RX_TTY_BLOCKED); 1491 zs_hwiflow(zst); 1492 } 1493 } 1494 simple_unlock(&cs->cs_lock); 1495 splx(s); 1496 return (1); 1497 } 1498 1499 /* 1500 * Internal version of zshwiflow 1501 * Called at splzs() and with the channel lock held. 1502 */ 1503 static void 1504 zs_hwiflow(zst) 1505 struct zstty_softc *zst; 1506 { 1507 struct zs_chanstate *cs = zst->zst_cs, *ccs; 1508 1509 if (cs->cs_wr5_rts == 0) 1510 return; 1511 1512 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs); 1513 1514 if (ISSET(zst->zst_rx_flags, RX_ANY_BLOCK)) { 1515 CLR(ccs->cs_preg[5], cs->cs_wr5_rts); 1516 CLR(ccs->cs_creg[5], cs->cs_wr5_rts); 1517 } else { 1518 SET(ccs->cs_preg[5], cs->cs_wr5_rts); 1519 SET(ccs->cs_creg[5], cs->cs_wr5_rts); 1520 } 1521 zs_write_reg(ccs, 5, ccs->cs_creg[5]); 1522 } 1523 1524 1525 /**************************************************************** 1526 * Interface to the lower layer (zscc) 1527 ****************************************************************/ 1528 1529 #define integrate static inline 1530 integrate void zstty_rxsoft(struct zstty_softc *, struct tty *); 1531 integrate void zstty_txsoft(struct zstty_softc *, struct tty *); 1532 integrate void zstty_stsoft(struct zstty_softc *, struct tty *); 1533 static void zstty_diag(void *); 1534 1535 /* 1536 * Receiver Ready interrupt. 1537 * Called at splzs() and with the channel lock held. 1538 */ 1539 static void 1540 zstty_rxint(cs) 1541 struct zs_chanstate *cs; 1542 { 1543 struct zstty_softc *zst = cs->cs_private; 1544 u_char *put, *end; 1545 u_int cc; 1546 u_char rr0, rr1, c; 1547 1548 end = zst->zst_ebuf; 1549 put = zst->zst_rbput; 1550 cc = zst->zst_rbavail; 1551 1552 while (cc > 0) { 1553 /* 1554 * First read the status, because reading the received char 1555 * destroys the status of this char. 1556 */ 1557 rr1 = zs_read_reg(cs, 1); 1558 c = zs_read_data(cs); 1559 1560 if (ISSET(rr1, ZSRR1_FE | ZSRR1_DO | ZSRR1_PE)) { 1561 /* Clear the receive error. */ 1562 zs_write_csr(cs, ZSWR0_RESET_ERRORS); 1563 } 1564 1565 cn_check_magic(zst->zst_tty->t_dev, c, zstty_cnm_state); 1566 put[0] = c; 1567 put[1] = rr1; 1568 put += 2; 1569 if (put >= end) 1570 put = zst->zst_rbuf; 1571 cc--; 1572 1573 rr0 = zs_read_csr(cs); 1574 if (!ISSET(rr0, ZSRR0_RX_READY)) 1575 break; 1576 } 1577 1578 /* 1579 * Current string of incoming characters ended because 1580 * no more data was available or we ran out of space. 1581 * Schedule a receive event if any data was received. 1582 * If we're out of space, turn off receive interrupts. 1583 */ 1584 zst->zst_rbput = put; 1585 zst->zst_rbavail = cc; 1586 if (!ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1587 zst->zst_rx_ready = 1; 1588 cs->cs_softreq = 1; 1589 } 1590 1591 /* 1592 * See if we are in danger of overflowing a buffer. If 1593 * so, use hardware flow control to ease the pressure. 1594 */ 1595 if (!ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED) && 1596 cc < zst->zst_r_hiwat) { 1597 SET(zst->zst_rx_flags, RX_IBUF_BLOCKED); 1598 zs_hwiflow(zst); 1599 } 1600 1601 /* 1602 * If we're out of space, disable receive interrupts 1603 * until the queue has drained a bit. 1604 */ 1605 if (!cc) { 1606 SET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED); 1607 CLR(cs->cs_preg[1], ZSWR1_RIE); 1608 cs->cs_creg[1] = cs->cs_preg[1]; 1609 zs_write_reg(cs, 1, cs->cs_creg[1]); 1610 } 1611 1612 #if 0 1613 printf("%xH%04d\n", zst->zst_rx_flags, zst->zst_rbavail); 1614 #endif 1615 } 1616 1617 /* 1618 * Transmitter Ready interrupt. 1619 * Called at splzs() and with the channel lock held. 1620 */ 1621 static void 1622 zstty_txint(cs) 1623 struct zs_chanstate *cs; 1624 { 1625 struct zstty_softc *zst = cs->cs_private; 1626 1627 /* 1628 * If we've delayed a parameter change, do it now, and restart 1629 * output. 1630 */ 1631 if (cs->cs_heldchange) { 1632 zs_loadchannelregs(cs); 1633 cs->cs_heldchange = 0; 1634 zst->zst_tbc = zst->zst_heldtbc; 1635 zst->zst_heldtbc = 0; 1636 } 1637 1638 /* Output the next character in the buffer, if any. */ 1639 if (zst->zst_tbc > 0) { 1640 zs_write_data(cs, *zst->zst_tba); 1641 zst->zst_tbc--; 1642 zst->zst_tba++; 1643 } else { 1644 /* Disable transmit completion interrupts if necessary. */ 1645 if (ISSET(cs->cs_preg[1], ZSWR1_TIE)) { 1646 CLR(cs->cs_preg[1], ZSWR1_TIE); 1647 cs->cs_creg[1] = cs->cs_preg[1]; 1648 zs_write_reg(cs, 1, cs->cs_creg[1]); 1649 } 1650 if (zst->zst_tx_busy) { 1651 zst->zst_tx_busy = 0; 1652 zst->zst_tx_done = 1; 1653 cs->cs_softreq = 1; 1654 } 1655 } 1656 } 1657 1658 /* 1659 * Status Change interrupt. 1660 * Called at splzs() and with the channel lock held. 1661 */ 1662 static void 1663 zstty_stint(cs, force) 1664 struct zs_chanstate *cs; 1665 int force; 1666 { 1667 struct zstty_softc *zst = cs->cs_private; 1668 u_char rr0, delta; 1669 1670 rr0 = zs_read_csr(cs); 1671 zs_write_csr(cs, ZSWR0_RESET_STATUS); 1672 1673 /* 1674 * Check here for console break, so that we can abort 1675 * even when interrupts are locking up the machine. 1676 */ 1677 if (ISSET(rr0, ZSRR0_BREAK)) 1678 cn_check_magic(zst->zst_tty->t_dev, CNC_BREAK, zstty_cnm_state); 1679 1680 if (!force) 1681 delta = rr0 ^ cs->cs_rr0; 1682 else 1683 delta = cs->cs_rr0_mask; 1684 cs->cs_rr0 = rr0; 1685 1686 if (ISSET(delta, cs->cs_rr0_mask)) { 1687 SET(cs->cs_rr0_delta, delta); 1688 1689 /* 1690 * Pulse-per-second clock signal on edge of DCD? 1691 */ 1692 if (ISSET(delta, zst->zst_ppsmask)) { 1693 #ifdef __HAVE_TIMECOUNTER 1694 if (zst->zst_pps_state.ppsparam.mode & PPS_CAPTUREBOTH) { 1695 pps_capture(&zst->zst_pps_state); 1696 pps_event(&zst->zst_pps_state, 1697 (ISSET(cs->cs_rr0, zst->zst_ppsmask)) 1698 ? PPS_CAPTUREASSERT 1699 : PPS_CAPTURECLEAR); 1700 } 1701 #else /* !__HAVE_TIMECOUNTER */ 1702 struct timeval tv; 1703 if (ISSET(rr0, zst->zst_ppsmask) == zst->zst_ppsassert) { 1704 /* XXX nanotime() */ 1705 microtime(&tv); 1706 TIMEVAL_TO_TIMESPEC(&tv, 1707 &zst->ppsinfo.assert_timestamp); 1708 if (zst->ppsparam.mode & PPS_OFFSETASSERT) { 1709 timespecadd(&zst->ppsinfo.assert_timestamp, 1710 &zst->ppsparam.assert_offset, 1711 &zst->ppsinfo.assert_timestamp); 1712 } 1713 1714 #ifdef PPS_SYNC 1715 if (pps_kc_hardpps_source == zst && 1716 pps_kc_hardpps_mode & PPS_CAPTUREASSERT) { 1717 hardpps(&tv, tv.tv_usec); 1718 } 1719 #endif 1720 zst->ppsinfo.assert_sequence++; 1721 zst->ppsinfo.current_mode = zst->ppsparam.mode; 1722 } else if (ISSET(rr0, zst->zst_ppsmask) == 1723 zst->zst_ppsclear) { 1724 /* XXX nanotime() */ 1725 microtime(&tv); 1726 TIMEVAL_TO_TIMESPEC(&tv, 1727 &zst->ppsinfo.clear_timestamp); 1728 if (zst->ppsparam.mode & PPS_OFFSETCLEAR) { 1729 timespecadd(&zst->ppsinfo.clear_timestamp, 1730 &zst->ppsparam.clear_offset, 1731 &zst->ppsinfo.clear_timestamp); 1732 } 1733 1734 #ifdef PPS_SYNC 1735 if (pps_kc_hardpps_source == zst && 1736 pps_kc_hardpps_mode & PPS_CAPTURECLEAR) { 1737 hardpps(&tv, tv.tv_usec); 1738 } 1739 #endif 1740 zst->ppsinfo.clear_sequence++; 1741 zst->ppsinfo.current_mode = zst->ppsparam.mode; 1742 } 1743 #endif /* !__HAVE_TIMECOUNTER */ 1744 } 1745 1746 /* 1747 * Stop output immediately if we lose the output 1748 * flow control signal or carrier detect. 1749 */ 1750 if (ISSET(~rr0, cs->cs_rr0_mask)) { 1751 zst->zst_tbc = 0; 1752 zst->zst_heldtbc = 0; 1753 } 1754 1755 zst->zst_st_check = 1; 1756 cs->cs_softreq = 1; 1757 } 1758 } 1759 1760 void 1761 zstty_diag(arg) 1762 void *arg; 1763 { 1764 struct zstty_softc *zst = arg; 1765 int overflows, floods; 1766 int s; 1767 1768 s = splzs(); 1769 overflows = zst->zst_overflows; 1770 zst->zst_overflows = 0; 1771 floods = zst->zst_floods; 1772 zst->zst_floods = 0; 1773 zst->zst_errors = 0; 1774 splx(s); 1775 1776 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1777 zst->zst_dev.dv_xname, 1778 overflows, overflows == 1 ? "" : "s", 1779 floods, floods == 1 ? "" : "s"); 1780 } 1781 1782 integrate void 1783 zstty_rxsoft(zst, tp) 1784 struct zstty_softc *zst; 1785 struct tty *tp; 1786 { 1787 struct zs_chanstate *cs = zst->zst_cs; 1788 int (*rint)(int, struct tty *) = tp->t_linesw->l_rint; 1789 u_char *get, *end; 1790 u_int cc, scc; 1791 u_char rr1; 1792 int code; 1793 int s; 1794 1795 end = zst->zst_ebuf; 1796 get = zst->zst_rbget; 1797 scc = cc = zstty_rbuf_size - zst->zst_rbavail; 1798 1799 if (cc == zstty_rbuf_size) { 1800 zst->zst_floods++; 1801 if (zst->zst_errors++ == 0) 1802 callout_reset(&zst->zst_diag_ch, 60 * hz, 1803 zstty_diag, zst); 1804 } 1805 1806 /* If not yet open, drop the entire buffer content here */ 1807 if (!ISSET(tp->t_state, TS_ISOPEN)) { 1808 get += cc << 1; 1809 if (get >= end) 1810 get -= zstty_rbuf_size << 1; 1811 cc = 0; 1812 } 1813 while (cc) { 1814 code = get[0]; 1815 rr1 = get[1]; 1816 if (ISSET(rr1, ZSRR1_DO | ZSRR1_FE | ZSRR1_PE)) { 1817 if (ISSET(rr1, ZSRR1_DO)) { 1818 zst->zst_overflows++; 1819 if (zst->zst_errors++ == 0) 1820 callout_reset(&zst->zst_diag_ch, 1821 60 * hz, zstty_diag, zst); 1822 } 1823 if (ISSET(rr1, ZSRR1_FE)) 1824 SET(code, TTY_FE); 1825 if (ISSET(rr1, ZSRR1_PE)) 1826 SET(code, TTY_PE); 1827 } 1828 if ((*rint)(code, tp) == -1) { 1829 /* 1830 * The line discipline's buffer is out of space. 1831 */ 1832 if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1833 /* 1834 * We're either not using flow control, or the 1835 * line discipline didn't tell us to block for 1836 * some reason. Either way, we have no way to 1837 * know when there's more space available, so 1838 * just drop the rest of the data. 1839 */ 1840 get += cc << 1; 1841 if (get >= end) 1842 get -= zstty_rbuf_size << 1; 1843 cc = 0; 1844 } else { 1845 /* 1846 * Don't schedule any more receive processing 1847 * until the line discipline tells us there's 1848 * space available (through comhwiflow()). 1849 * Leave the rest of the data in the input 1850 * buffer. 1851 */ 1852 SET(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1853 } 1854 break; 1855 } 1856 get += 2; 1857 if (get >= end) 1858 get = zst->zst_rbuf; 1859 cc--; 1860 } 1861 1862 if (cc != scc) { 1863 zst->zst_rbget = get; 1864 s = splzs(); 1865 simple_lock(&cs->cs_lock); 1866 cc = zst->zst_rbavail += scc - cc; 1867 /* Buffers should be ok again, release possible block. */ 1868 if (cc >= zst->zst_r_lowat) { 1869 if (ISSET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED)) { 1870 CLR(zst->zst_rx_flags, RX_IBUF_OVERFLOWED); 1871 SET(cs->cs_preg[1], ZSWR1_RIE); 1872 cs->cs_creg[1] = cs->cs_preg[1]; 1873 zs_write_reg(cs, 1, cs->cs_creg[1]); 1874 } 1875 if (ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED)) { 1876 CLR(zst->zst_rx_flags, RX_IBUF_BLOCKED); 1877 zs_hwiflow(zst); 1878 } 1879 } 1880 simple_unlock(&cs->cs_lock); 1881 splx(s); 1882 } 1883 1884 #if 0 1885 printf("%xS%04d\n", zst->zst_rx_flags, zst->zst_rbavail); 1886 #endif 1887 } 1888 1889 integrate void 1890 zstty_txsoft(zst, tp) 1891 struct zstty_softc *zst; 1892 struct tty *tp; 1893 { 1894 struct zs_chanstate *cs = zst->zst_cs; 1895 int s; 1896 1897 s = splzs(); 1898 simple_lock(&cs->cs_lock); 1899 CLR(tp->t_state, TS_BUSY); 1900 if (ISSET(tp->t_state, TS_FLUSH)) 1901 CLR(tp->t_state, TS_FLUSH); 1902 else 1903 ndflush(&tp->t_outq, (int)(zst->zst_tba - tp->t_outq.c_cf)); 1904 simple_unlock(&cs->cs_lock); 1905 splx(s); 1906 (*tp->t_linesw->l_start)(tp); 1907 } 1908 1909 integrate void 1910 zstty_stsoft(zst, tp) 1911 struct zstty_softc *zst; 1912 struct tty *tp; 1913 { 1914 struct zs_chanstate *cs = zst->zst_cs; 1915 u_char rr0, delta; 1916 int s; 1917 1918 s = splzs(); 1919 simple_lock(&cs->cs_lock); 1920 rr0 = cs->cs_rr0; 1921 delta = cs->cs_rr0_delta; 1922 cs->cs_rr0_delta = 0; 1923 simple_unlock(&cs->cs_lock); 1924 splx(s); 1925 1926 if (ISSET(delta, cs->cs_rr0_dcd)) { 1927 /* 1928 * Inform the tty layer that carrier detect changed. 1929 */ 1930 (void) (*tp->t_linesw->l_modem)(tp, ISSET(rr0, ZSRR0_DCD)); 1931 } 1932 1933 if (ISSET(delta, cs->cs_rr0_cts)) { 1934 /* Block or unblock output according to flow control. */ 1935 if (ISSET(rr0, cs->cs_rr0_cts)) { 1936 zst->zst_tx_stopped = 0; 1937 (*tp->t_linesw->l_start)(tp); 1938 } else { 1939 zst->zst_tx_stopped = 1; 1940 } 1941 } 1942 } 1943 1944 /* 1945 * Software interrupt. Called at zssoft 1946 * 1947 * The main job to be done here is to empty the input ring 1948 * by passing its contents up to the tty layer. The ring is 1949 * always emptied during this operation, therefore the ring 1950 * must not be larger than the space after "high water" in 1951 * the tty layer, or the tty layer might drop our input. 1952 * 1953 * Note: an "input blockage" condition is assumed to exist if 1954 * EITHER the TS_TBLOCK flag or zst_rx_blocked flag is set. 1955 */ 1956 static void 1957 zstty_softint(cs) 1958 struct zs_chanstate *cs; 1959 { 1960 struct zstty_softc *zst = cs->cs_private; 1961 struct tty *tp = zst->zst_tty; 1962 int s; 1963 1964 s = spltty(); 1965 1966 if (zst->zst_rx_ready) { 1967 zst->zst_rx_ready = 0; 1968 zstty_rxsoft(zst, tp); 1969 } 1970 1971 if (zst->zst_st_check) { 1972 zst->zst_st_check = 0; 1973 zstty_stsoft(zst, tp); 1974 } 1975 1976 if (zst->zst_tx_done) { 1977 zst->zst_tx_done = 0; 1978 zstty_txsoft(zst, tp); 1979 } 1980 1981 splx(s); 1982 } 1983 1984 struct zsops zsops_tty = { 1985 zstty_rxint, /* receive char available */ 1986 zstty_stint, /* external/status */ 1987 zstty_txint, /* xmit buffer empty */ 1988 zstty_softint, /* process software interrupt */ 1989 }; 1990 1991 #ifdef ZS_TXDMA 1992 void 1993 zstty_txdma_int(arg) 1994 void *arg; 1995 { 1996 struct zs_chanstate *cs = arg; 1997 struct zstty_softc *zst = cs->cs_private; 1998 1999 zst->zst_tba += zst->zst_tbc; 2000 zst->zst_tbc = 0; 2001 2002 if (zst->zst_tx_busy) { 2003 zst->zst_tx_busy = 0; 2004 zst->zst_tx_done = 1; 2005 cs->cs_softreq = 1; 2006 } 2007 } 2008 #endif
Cache object: 18c2f1bd4373861e00cf97f128f68624
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