z8530tty.c revision 1.104
1 /* $NetBSD: z8530tty.c,v 1.104 2006/03/28 17:38:30 thorpej 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 (at) NetBSD.org>, 132 * Bill Studenmund <wrstuden (at) loki.stanford.edu> 133 * Ian Dall <Ian.Dall (at) 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 1.104 2006/03/28 17:38:30 thorpej 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> 158 159 #include <dev/ic/z8530reg.h> 160 #include <machine/z8530var.h> 161 162 #include <dev/cons.h> 163 164 #include "locators.h" 165 166 /* 167 * How many input characters we can buffer. 168 * The port-specific var.h may override this. 169 * Note: must be a power of two! 170 */ 171 #ifndef ZSTTY_RING_SIZE 172 #define ZSTTY_RING_SIZE 2048 173 #endif 174 175 static struct cnm_state zstty_cnm_state; 176 /* 177 * Make this an option variable one can patch. 178 * But be warned: this must be a power of 2! 179 */ 180 u_int zstty_rbuf_size = ZSTTY_RING_SIZE; 181 182 /* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */ 183 u_int zstty_rbuf_hiwat = (ZSTTY_RING_SIZE * 1) / 4; 184 u_int zstty_rbuf_lowat = (ZSTTY_RING_SIZE * 3) / 4; 185 186 static int zsppscap = 187 PPS_TSFMT_TSPEC | 188 PPS_CAPTUREASSERT | 189 PPS_CAPTURECLEAR | 190 PPS_OFFSETASSERT | PPS_OFFSETCLEAR; 191 192 struct zstty_softc { 193 struct device zst_dev; /* required first: base device */ 194 struct tty *zst_tty; 195 struct zs_chanstate *zst_cs; 196 197 struct callout zst_diag_ch; 198 199 u_int zst_overflows, 200 zst_floods, 201 zst_errors; 202 203 int zst_hwflags, /* see z8530var.h */ 204 zst_swflags; /* TIOCFLAG_SOFTCAR, ... <ttycom.h> */ 205 206 u_int zst_r_hiwat, 207 zst_r_lowat; 208 u_char *volatile zst_rbget, 209 *volatile zst_rbput; 210 volatile u_int zst_rbavail; 211 u_char *zst_rbuf, 212 *zst_ebuf; 213 214 /* 215 * The transmit byte count and address are used for pseudo-DMA 216 * output in the hardware interrupt code. PDMA can be suspended 217 * to get pending changes done; heldtbc is used for this. It can 218 * also be stopped for ^S; this sets TS_TTSTOP in tp->t_state. 219 */ 220 u_char *zst_tba; /* transmit buffer address */ 221 u_int zst_tbc, /* transmit byte count */ 222 zst_heldtbc; /* held tbc while xmission stopped */ 223 224 /* Flags to communicate with zstty_softint() */ 225 volatile u_char zst_rx_flags, /* receiver blocked */ 226 #define RX_TTY_BLOCKED 0x01 227 #define RX_TTY_OVERFLOWED 0x02 228 #define RX_IBUF_BLOCKED 0x04 229 #define RX_IBUF_OVERFLOWED 0x08 230 #define RX_ANY_BLOCK 0x0f 231 zst_tx_busy, /* working on an output chunk */ 232 zst_tx_done, /* done with one output chunk */ 233 zst_tx_stopped, /* H/W level stop (lost CTS) */ 234 zst_st_check, /* got a status interrupt */ 235 zst_rx_ready; 236 237 /* PPS signal on DCD, with or without inkernel clock disciplining */ 238 u_char zst_ppsmask; /* pps signal mask */ 239 u_char zst_ppsassert; /* pps leading edge */ 240 u_char zst_ppsclear; /* pps trailing edge */ 241 pps_info_t ppsinfo; 242 pps_params_t ppsparam; 243 }; 244 245 /* Definition of the driver for autoconfig. */ 246 static int zstty_match(struct device *, struct cfdata *, void *); 247 static void zstty_attach(struct device *, struct device *, void *); 248 249 CFATTACH_DECL(zstty, sizeof(struct zstty_softc), 250 zstty_match, zstty_attach, NULL, NULL); 251 252 extern struct cfdriver zstty_cd; 253 254 dev_type_open(zsopen); 255 dev_type_close(zsclose); 256 dev_type_read(zsread); 257 dev_type_write(zswrite); 258 dev_type_ioctl(zsioctl); 259 dev_type_stop(zsstop); 260 dev_type_tty(zstty); 261 dev_type_poll(zspoll); 262 263 const struct cdevsw zstty_cdevsw = { 264 zsopen, zsclose, zsread, zswrite, zsioctl, 265 zsstop, zstty, zspoll, nommap, ttykqfilter, D_TTY 266 }; 267 268 struct zsops zsops_tty; 269 270 static void zs_shutdown(struct zstty_softc *); 271 static void zsstart(struct tty *); 272 static int zsparam(struct tty *, struct termios *); 273 static void zs_modem(struct zstty_softc *, int); 274 static void tiocm_to_zs(struct zstty_softc *, u_long, int); 275 static int zs_to_tiocm(struct zstty_softc *); 276 static int zshwiflow(struct tty *, int); 277 static void zs_hwiflow(struct zstty_softc *); 278 static void zs_maskintr(struct zstty_softc *); 279 280 /* Low-level routines. */ 281 static void zstty_rxint (struct zs_chanstate *); 282 static void zstty_stint (struct zs_chanstate *, int); 283 static void zstty_txint (struct zs_chanstate *); 284 static void zstty_softint(struct zs_chanstate *); 285 286 #define ZSUNIT(x) (minor(x) & 0x7ffff) 287 #define ZSDIALOUT(x) (minor(x) & 0x80000) 288 289 struct tty *zstty_get_tty_from_dev(struct device *); 290 291 /* 292 * XXX get the (struct tty *) out of a (struct device *) we trust to be a 293 * (struct zstty_softc *) - needed by sparc/dev/zs.c, sparc64/dev/zs.c, 294 * sun3/dev/zs.c and sun2/dev/zs.c will probably need it at some point 295 */ 296 297 struct tty * 298 zstty_get_tty_from_dev(struct device *dev) 299 { 300 struct zstty_softc *sc = (struct zstty_softc *)dev; 301 302 return sc->zst_tty; 303 } 304 305 /* 306 * zstty_match: how is this zs channel configured? 307 */ 308 int 309 zstty_match(parent, cf, aux) 310 struct device *parent; 311 struct cfdata *cf; 312 void *aux; 313 { 314 struct zsc_attach_args *args = aux; 315 316 /* Exact match is better than wildcard. */ 317 if (cf->zsccf_channel == args->channel) 318 return 2; 319 320 /* This driver accepts wildcard. */ 321 if (cf->zsccf_channel == ZSCCF_CHANNEL_DEFAULT) 322 return 1; 323 324 return 0; 325 } 326 327 void 328 zstty_attach(parent, self, aux) 329 struct device *parent, *self; 330 void *aux; 331 332 { 333 struct zsc_softc *zsc = (void *) parent; 334 struct zstty_softc *zst = (void *) self; 335 struct cfdata *cf = self->dv_cfdata; 336 struct zsc_attach_args *args = aux; 337 struct zs_chanstate *cs; 338 struct tty *tp; 339 int channel, s, tty_unit; 340 dev_t dev; 341 const char *i, *o; 342 int dtr_on; 343 int resetbit; 344 345 callout_init(&zst->zst_diag_ch); 346 cn_init_magic(&zstty_cnm_state); 347 348 tty_unit = device_unit(&zst->zst_dev); 349 channel = args->channel; 350 cs = zsc->zsc_cs[channel]; 351 cs->cs_private = zst; 352 cs->cs_ops = &zsops_tty; 353 354 zst->zst_cs = cs; 355 zst->zst_swflags = cf->cf_flags; /* softcar, etc. */ 356 zst->zst_hwflags = args->hwflags; 357 dev = makedev(cdevsw_lookup_major(&zstty_cdevsw), tty_unit); 358 359 if (zst->zst_swflags) 360 printf(" flags 0x%x", zst->zst_swflags); 361 362 /* 363 * Check whether we serve as a console device. 364 * XXX - split console input/output channels aren't 365 * supported yet on /dev/console 366 */ 367 i = o = NULL; 368 if ((zst->zst_hwflags & ZS_HWFLAG_CONSOLE_INPUT) != 0) { 369 i = "input"; 370 if ((args->hwflags & ZS_HWFLAG_USE_CONSDEV) != 0) { 371 args->consdev->cn_dev = dev; 372 cn_tab->cn_pollc = args->consdev->cn_pollc; 373 cn_tab->cn_getc = args->consdev->cn_getc; 374 } 375 cn_tab->cn_dev = dev; 376 /* Set console magic to BREAK */ 377 cn_set_magic("\047\001"); 378 } 379 if ((zst->zst_hwflags & ZS_HWFLAG_CONSOLE_OUTPUT) != 0) { 380 o = "output"; 381 if ((args->hwflags & ZS_HWFLAG_USE_CONSDEV) != 0) { 382 cn_tab->cn_putc = args->consdev->cn_putc; 383 } 384 cn_tab->cn_dev = dev; 385 } 386 if (i != NULL || o != NULL) 387 printf(" (console %s)", i ? (o ? "i/o" : i) : o); 388 389 #ifdef KGDB 390 if (zs_check_kgdb(cs, dev)) { 391 /* 392 * Allow kgdb to "take over" this port. Returns true 393 * if this serial port is in-use by kgdb. 394 */ 395 printf(" (kgdb)\n"); 396 /* 397 * This is the kgdb port (exclusive use) 398 * so skip the normal attach code. 399 */ 400 return; 401 } 402 #endif 403 printf("\n"); 404 405 tp = ttymalloc(); 406 tp->t_dev = dev; 407 tp->t_oproc = zsstart; 408 tp->t_param = zsparam; 409 tp->t_hwiflow = zshwiflow; 410 tty_attach(tp); 411 412 zst->zst_tty = tp; 413 zst->zst_rbuf = malloc(zstty_rbuf_size << 1, M_DEVBUF, M_WAITOK); 414 zst->zst_ebuf = zst->zst_rbuf + (zstty_rbuf_size << 1); 415 /* Disable the high water mark. */ 416 zst->zst_r_hiwat = 0; 417 zst->zst_r_lowat = 0; 418 zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf; 419 zst->zst_rbavail = zstty_rbuf_size; 420 421 /* if there are no enable/disable functions, assume the device 422 is always enabled */ 423 if (!cs->enable) 424 cs->enabled = 1; 425 426 /* 427 * Hardware init 428 */ 429 dtr_on = 0; 430 resetbit = 0; 431 if (ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 432 /* Call zsparam similar to open. */ 433 struct termios t; 434 435 /* Wait a while for previous console output to complete */ 436 DELAY(10000); 437 438 /* Setup the "new" parameters in t. */ 439 t.c_ispeed = 0; 440 t.c_ospeed = cs->cs_defspeed; 441 t.c_cflag = cs->cs_defcflag; 442 443 /* 444 * Turn on receiver and status interrupts. 445 * We defer the actual write of the register to zsparam(), 446 * but we must make sure status interrupts are turned on by 447 * the time zsparam() reads the initial rr0 state. 448 */ 449 SET(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE); 450 451 /* Make sure zsparam will see changes. */ 452 tp->t_ospeed = 0; 453 (void) zsparam(tp, &t); 454 455 /* Make sure DTR is on now. */ 456 dtr_on = 1; 457 458 } else if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_NORESET)) { 459 /* Not the console; may need reset. */ 460 resetbit = (channel == 0) ? ZSWR9_A_RESET : ZSWR9_B_RESET; 461 } 462 463 s = splzs(); 464 simple_lock(&cs->cs_lock); 465 if (resetbit) 466 zs_write_reg(cs, 9, resetbit); 467 zs_modem(zst, dtr_on); 468 simple_unlock(&cs->cs_lock); 469 splx(s); 470 } 471 472 473 /* 474 * Return pointer to our tty. 475 */ 476 struct tty * 477 zstty(dev) 478 dev_t dev; 479 { 480 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 481 482 return (zst->zst_tty); 483 } 484 485 486 void 487 zs_shutdown(zst) 488 struct zstty_softc *zst; 489 { 490 struct zs_chanstate *cs = zst->zst_cs; 491 struct tty *tp = zst->zst_tty; 492 int s; 493 494 s = splzs(); 495 simple_lock(&cs->cs_lock); 496 497 /* If we were asserting flow control, then deassert it. */ 498 SET(zst->zst_rx_flags, RX_IBUF_BLOCKED); 499 zs_hwiflow(zst); 500 501 /* Clear any break condition set with TIOCSBRK. */ 502 zs_break(cs, 0); 503 504 /* Turn off PPS capture on last close. */ 505 zst->zst_ppsmask = 0; 506 zst->ppsparam.mode = 0; 507 508 /* 509 * Hang up if necessary. Wait a bit, so the other side has time to 510 * notice even if we immediately open the port again. 511 */ 512 if (ISSET(tp->t_cflag, HUPCL)) { 513 zs_modem(zst, 0); 514 simple_unlock(&cs->cs_lock); 515 splx(s); 516 /* 517 * XXX - another process is not prevented from opening 518 * the device during our sleep. 519 */ 520 (void) tsleep(cs, TTIPRI, ttclos, hz); 521 /* Re-check state in case we were opened during our sleep */ 522 if (ISSET(tp->t_state, TS_ISOPEN) || tp->t_wopen != 0) 523 return; 524 525 s = splzs(); 526 simple_lock(&cs->cs_lock); 527 } 528 529 /* Turn off interrupts if not the console. */ 530 if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 531 CLR(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE); 532 cs->cs_creg[1] = cs->cs_preg[1]; 533 zs_write_reg(cs, 1, cs->cs_creg[1]); 534 } 535 536 /* Call the power management hook. */ 537 if (cs->disable) { 538 #ifdef DIAGNOSTIC 539 if (!cs->enabled) 540 panic("zs_shutdown: not enabled?"); 541 #endif 542 (*cs->disable)(zst->zst_cs); 543 } 544 545 simple_unlock(&cs->cs_lock); 546 splx(s); 547 } 548 549 /* 550 * Open a zs serial (tty) port. 551 */ 552 int 553 zsopen(dev, flags, mode, l) 554 dev_t dev; 555 int flags; 556 int mode; 557 struct lwp *l; 558 { 559 struct zstty_softc *zst; 560 struct zs_chanstate *cs; 561 struct tty *tp; 562 struct proc *p; 563 int s, s2; 564 int error; 565 566 zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 567 if (zst == NULL) 568 return (ENXIO); 569 570 tp = zst->zst_tty; 571 cs = zst->zst_cs; 572 p = l->l_proc; 573 574 /* If KGDB took the line, then tp==NULL */ 575 if (tp == NULL) 576 return (EBUSY); 577 578 if (ISSET(tp->t_state, TS_ISOPEN) && 579 ISSET(tp->t_state, TS_XCLUDE) && 580 suser(p->p_ucred, &p->p_acflag) != 0) 581 return (EBUSY); 582 583 s = spltty(); 584 585 /* 586 * Do the following iff this is a first open. 587 */ 588 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 589 struct termios t; 590 591 tp->t_dev = dev; 592 593 /* Call the power management hook. */ 594 if (cs->enable) { 595 if ((*cs->enable)(cs)) { 596 splx(s); 597 printf("%s: device enable failed\n", 598 zst->zst_dev.dv_xname); 599 return (EIO); 600 } 601 } 602 603 /* 604 * Initialize the termios status to the defaults. Add in the 605 * sticky bits from TIOCSFLAGS. 606 */ 607 t.c_ispeed = 0; 608 t.c_ospeed = cs->cs_defspeed; 609 t.c_cflag = cs->cs_defcflag; 610 if (ISSET(zst->zst_swflags, TIOCFLAG_CLOCAL)) 611 SET(t.c_cflag, CLOCAL); 612 if (ISSET(zst->zst_swflags, TIOCFLAG_CRTSCTS)) 613 SET(t.c_cflag, CRTSCTS); 614 if (ISSET(zst->zst_swflags, TIOCFLAG_CDTRCTS)) 615 SET(t.c_cflag, CDTRCTS); 616 if (ISSET(zst->zst_swflags, TIOCFLAG_MDMBUF)) 617 SET(t.c_cflag, MDMBUF); 618 619 s2 = splzs(); 620 simple_lock(&cs->cs_lock); 621 622 /* 623 * Turn on receiver and status interrupts. 624 * We defer the actual write of the register to zsparam(), 625 * but we must make sure status interrupts are turned on by 626 * the time zsparam() reads the initial rr0 state. 627 */ 628 SET(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE); 629 630 /* Clear PPS capture state on first open. */ 631 zst->zst_ppsmask = 0; 632 zst->ppsparam.mode = 0; 633 634 simple_unlock(&cs->cs_lock); 635 splx(s2); 636 637 /* Make sure zsparam will see changes. */ 638 tp->t_ospeed = 0; 639 (void) zsparam(tp, &t); 640 641 /* 642 * Note: zsparam has done: cflag, ispeed, ospeed 643 * so we just need to do: iflag, oflag, lflag, cc 644 * For "raw" mode, just leave all zeros. 645 */ 646 if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_RAW)) { 647 tp->t_iflag = TTYDEF_IFLAG; 648 tp->t_oflag = TTYDEF_OFLAG; 649 tp->t_lflag = TTYDEF_LFLAG; 650 } else { 651 tp->t_iflag = 0; 652 tp->t_oflag = 0; 653 tp->t_lflag = 0; 654 } 655 ttychars(tp); 656 ttsetwater(tp); 657 658 s2 = splzs(); 659 simple_lock(&cs->cs_lock); 660 661 /* 662 * Turn on DTR. We must always do this, even if carrier is not 663 * present, because otherwise we'd have to use TIOCSDTR 664 * immediately after setting CLOCAL, which applications do not 665 * expect. We always assert DTR while the device is open 666 * unless explicitly requested to deassert it. 667 */ 668 zs_modem(zst, 1); 669 670 /* Clear the input ring, and unblock. */ 671 zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf; 672 zst->zst_rbavail = zstty_rbuf_size; 673 zs_iflush(cs); 674 CLR(zst->zst_rx_flags, RX_ANY_BLOCK); 675 zs_hwiflow(zst); 676 677 simple_unlock(&cs->cs_lock); 678 splx(s2); 679 } 680 681 splx(s); 682 683 error = ttyopen(tp, ZSDIALOUT(dev), ISSET(flags, O_NONBLOCK)); 684 if (error) 685 goto bad; 686 687 error = (*tp->t_linesw->l_open)(dev, tp); 688 if (error) 689 goto bad; 690 691 return (0); 692 693 bad: 694 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 695 /* 696 * We failed to open the device, and nobody else had it opened. 697 * Clean up the state as appropriate. 698 */ 699 zs_shutdown(zst); 700 } 701 702 return (error); 703 } 704 705 /* 706 * Close a zs serial port. 707 */ 708 int 709 zsclose(dev, flags, mode, l) 710 dev_t dev; 711 int flags; 712 int mode; 713 struct lwp *l; 714 { 715 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 716 struct tty *tp = zst->zst_tty; 717 718 /* XXX This is for cons.c. */ 719 if (!ISSET(tp->t_state, TS_ISOPEN)) 720 return 0; 721 722 (*tp->t_linesw->l_close)(tp, flags); 723 ttyclose(tp); 724 725 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 726 /* 727 * Although we got a last close, the device may still be in 728 * use; e.g. if this was the dialout node, and there are still 729 * processes waiting for carrier on the non-dialout node. 730 */ 731 zs_shutdown(zst); 732 } 733 734 return (0); 735 } 736 737 /* 738 * Read/write zs serial port. 739 */ 740 int 741 zsread(dev, uio, flags) 742 dev_t dev; 743 struct uio *uio; 744 int flags; 745 { 746 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 747 struct tty *tp = zst->zst_tty; 748 749 return ((*tp->t_linesw->l_read)(tp, uio, flags)); 750 } 751 752 int 753 zswrite(dev, uio, flags) 754 dev_t dev; 755 struct uio *uio; 756 int flags; 757 { 758 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 759 struct tty *tp = zst->zst_tty; 760 761 return ((*tp->t_linesw->l_write)(tp, uio, flags)); 762 } 763 764 int 765 zspoll(dev, events, l) 766 dev_t dev; 767 int events; 768 struct lwp *l; 769 { 770 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 771 struct tty *tp = zst->zst_tty; 772 773 return ((*tp->t_linesw->l_poll)(tp, events, l)); 774 } 775 776 int 777 zsioctl(dev, cmd, data, flag, l) 778 dev_t dev; 779 u_long cmd; 780 caddr_t data; 781 int flag; 782 struct lwp *l; 783 { 784 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 785 struct zs_chanstate *cs = zst->zst_cs; 786 struct tty *tp = zst->zst_tty; 787 struct proc *p = l->l_proc; 788 int error; 789 int s; 790 791 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 792 if (error != EPASSTHROUGH) 793 return (error); 794 795 error = ttioctl(tp, cmd, data, flag, l); 796 if (error != EPASSTHROUGH) 797 return (error); 798 799 #ifdef ZS_MD_IOCTL 800 error = ZS_MD_IOCTL(cs, cmd, data); 801 if (error != EPASSTHROUGH) 802 return (error); 803 #endif /* ZS_MD_IOCTL */ 804 805 error = 0; 806 807 s = splzs(); 808 simple_lock(&cs->cs_lock); 809 810 switch (cmd) { 811 case TIOCSBRK: 812 zs_break(cs, 1); 813 break; 814 815 case TIOCCBRK: 816 zs_break(cs, 0); 817 break; 818 819 case TIOCGFLAGS: 820 *(int *)data = zst->zst_swflags; 821 break; 822 823 case TIOCSFLAGS: 824 error = suser(p->p_ucred, &p->p_acflag); 825 if (error) 826 break; 827 zst->zst_swflags = *(int *)data; 828 break; 829 830 case TIOCSDTR: 831 zs_modem(zst, 1); 832 break; 833 834 case TIOCCDTR: 835 zs_modem(zst, 0); 836 break; 837 838 case TIOCMSET: 839 case TIOCMBIS: 840 case TIOCMBIC: 841 tiocm_to_zs(zst, cmd, *(int *)data); 842 break; 843 844 case TIOCMGET: 845 *(int *)data = zs_to_tiocm(zst); 846 break; 847 848 case PPS_IOC_CREATE: 849 break; 850 851 case PPS_IOC_DESTROY: 852 break; 853 854 case PPS_IOC_GETPARAMS: { 855 pps_params_t *pp; 856 pp = (pps_params_t *)data; 857 *pp = zst->ppsparam; 858 break; 859 } 860 861 case PPS_IOC_SETPARAMS: { 862 pps_params_t *pp; 863 int mode; 864 if (cs->cs_rr0_pps == 0) { 865 error = EINVAL; 866 break; 867 } 868 pp = (pps_params_t *)data; 869 if (pp->mode & ~zsppscap) { 870 error = EINVAL; 871 break; 872 } 873 zst->ppsparam = *pp; 874 /* 875 * compute masks from user-specified timestamp state. 876 */ 877 mode = zst->ppsparam.mode; 878 switch (mode & PPS_CAPTUREBOTH) { 879 case 0: 880 zst->zst_ppsmask = 0; 881 break; 882 883 case PPS_CAPTUREASSERT: 884 zst->zst_ppsmask = ZSRR0_DCD; 885 zst->zst_ppsassert = ZSRR0_DCD; 886 zst->zst_ppsclear = -1; 887 break; 888 889 case PPS_CAPTURECLEAR: 890 zst->zst_ppsmask = ZSRR0_DCD; 891 zst->zst_ppsassert = -1; 892 zst->zst_ppsclear = 0; 893 break; 894 895 case PPS_CAPTUREBOTH: 896 zst->zst_ppsmask = ZSRR0_DCD; 897 zst->zst_ppsassert = ZSRR0_DCD; 898 zst->zst_ppsclear = 0; 899 break; 900 901 default: 902 error = EINVAL; 903 break; 904 } 905 906 /* 907 * Now update interrupts. 908 */ 909 zs_maskintr(zst); 910 /* 911 * If nothing is being transmitted, set up new current values, 912 * else mark them as pending. 913 */ 914 if (!cs->cs_heldchange) { 915 if (zst->zst_tx_busy) { 916 zst->zst_heldtbc = zst->zst_tbc; 917 zst->zst_tbc = 0; 918 cs->cs_heldchange = 1; 919 } else 920 zs_loadchannelregs(cs); 921 } 922 923 break; 924 } 925 926 case PPS_IOC_GETCAP: 927 *(int *)data = zsppscap; 928 break; 929 930 case PPS_IOC_FETCH: { 931 pps_info_t *pi; 932 pi = (pps_info_t *)data; 933 *pi = zst->ppsinfo; 934 break; 935 } 936 937 #ifdef PPS_SYNC 938 case PPS_IOC_KCBIND: { 939 int edge = (*(int *)data) & PPS_CAPTUREBOTH; 940 941 if (edge == 0) { 942 /* 943 * remove binding for this source; ignore 944 * the request if this is not the current 945 * hardpps source 946 */ 947 if (pps_kc_hardpps_source == zst) { 948 pps_kc_hardpps_source = NULL; 949 pps_kc_hardpps_mode = 0; 950 } 951 } else { 952 /* 953 * bind hardpps to this source, replacing any 954 * previously specified source or edges 955 */ 956 pps_kc_hardpps_source = zst; 957 pps_kc_hardpps_mode = edge; 958 } 959 break; 960 } 961 #endif /* PPS_SYNC */ 962 963 case TIOCDCDTIMESTAMP: /* XXX old, overloaded API used by xntpd v3 */ 964 if (cs->cs_rr0_pps == 0) { 965 error = EINVAL; 966 break; 967 } 968 /* 969 * Some GPS clocks models use the falling rather than 970 * rising edge as the on-the-second signal. 971 * The old API has no way to specify PPS polarity. 972 */ 973 zst->zst_ppsmask = ZSRR0_DCD; 974 #ifndef PPS_TRAILING_EDGE 975 zst->zst_ppsassert = ZSRR0_DCD; 976 zst->zst_ppsclear = -1; 977 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 978 &zst->ppsinfo.assert_timestamp); 979 #else 980 zst->zst_ppsassert = -1; 981 zst->zst_ppsclear = 01; 982 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 983 &zst->ppsinfo.clear_timestamp); 984 #endif 985 /* 986 * Now update interrupts. 987 */ 988 zs_maskintr(zst); 989 /* 990 * If nothing is being transmitted, set up new current values, 991 * else mark them as pending. 992 */ 993 if (!cs->cs_heldchange) { 994 if (zst->zst_tx_busy) { 995 zst->zst_heldtbc = zst->zst_tbc; 996 zst->zst_tbc = 0; 997 cs->cs_heldchange = 1; 998 } else 999 zs_loadchannelregs(cs); 1000 } 1001 1002 break; 1003 1004 default: 1005 error = EPASSTHROUGH; 1006 break; 1007 } 1008 1009 simple_unlock(&cs->cs_lock); 1010 splx(s); 1011 1012 return (error); 1013 } 1014 1015 /* 1016 * Start or restart transmission. 1017 */ 1018 static void 1019 zsstart(tp) 1020 struct tty *tp; 1021 { 1022 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(tp->t_dev)); 1023 struct zs_chanstate *cs = zst->zst_cs; 1024 u_char *tba; 1025 int s, tbc; 1026 1027 s = spltty(); 1028 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 1029 goto out; 1030 if (zst->zst_tx_stopped) 1031 goto out; 1032 1033 if (tp->t_outq.c_cc <= tp->t_lowat) { 1034 if (ISSET(tp->t_state, TS_ASLEEP)) { 1035 CLR(tp->t_state, TS_ASLEEP); 1036 wakeup((caddr_t)&tp->t_outq); 1037 } 1038 selwakeup(&tp->t_wsel); 1039 if (tp->t_outq.c_cc == 0) 1040 goto out; 1041 } 1042 1043 /* Grab the first contiguous region of buffer space. */ 1044 tba = tp->t_outq.c_cf; 1045 tbc = ndqb(&tp->t_outq, 0); 1046 1047 (void) splzs(); 1048 simple_lock(&cs->cs_lock); 1049 1050 zst->zst_tba = tba; 1051 zst->zst_tbc = tbc; 1052 SET(tp->t_state, TS_BUSY); 1053 zst->zst_tx_busy = 1; 1054 1055 #ifdef ZS_TXDMA 1056 if (zst->zst_tbc > 1) { 1057 zs_dma_setup(cs, zst->zst_tba, zst->zst_tbc); 1058 goto out; 1059 } 1060 #endif 1061 1062 /* Enable transmit completion interrupts if necessary. */ 1063 if (!ISSET(cs->cs_preg[1], ZSWR1_TIE)) { 1064 SET(cs->cs_preg[1], ZSWR1_TIE); 1065 cs->cs_creg[1] = cs->cs_preg[1]; 1066 zs_write_reg(cs, 1, cs->cs_creg[1]); 1067 } 1068 1069 /* Output the first character of the contiguous buffer. */ 1070 zs_write_data(cs, *zst->zst_tba); 1071 zst->zst_tbc--; 1072 zst->zst_tba++; 1073 1074 simple_unlock(&cs->cs_lock); 1075 out: 1076 splx(s); 1077 return; 1078 } 1079 1080 /* 1081 * Stop output, e.g., for ^S or output flush. 1082 */ 1083 void 1084 zsstop(tp, flag) 1085 struct tty *tp; 1086 int flag; 1087 { 1088 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(tp->t_dev)); 1089 int s; 1090 1091 s = splzs(); 1092 if (ISSET(tp->t_state, TS_BUSY)) { 1093 /* Stop transmitting at the next chunk. */ 1094 zst->zst_tbc = 0; 1095 zst->zst_heldtbc = 0; 1096 if (!ISSET(tp->t_state, TS_TTSTOP)) 1097 SET(tp->t_state, TS_FLUSH); 1098 } 1099 splx(s); 1100 } 1101 1102 /* 1103 * Set ZS tty parameters from termios. 1104 * XXX - Should just copy the whole termios after 1105 * making sure all the changes could be done. 1106 */ 1107 static int 1108 zsparam(tp, t) 1109 struct tty *tp; 1110 struct termios *t; 1111 { 1112 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(tp->t_dev)); 1113 struct zs_chanstate *cs = zst->zst_cs; 1114 int ospeed; 1115 tcflag_t cflag; 1116 u_char tmp3, tmp4, tmp5; 1117 int s, error; 1118 1119 ospeed = t->c_ospeed; 1120 cflag = t->c_cflag; 1121 1122 /* Check requested parameters. */ 1123 if (ospeed < 0) 1124 return (EINVAL); 1125 if (t->c_ispeed && t->c_ispeed != ospeed) 1126 return (EINVAL); 1127 1128 /* 1129 * For the console, always force CLOCAL and !HUPCL, so that the port 1130 * is always active. 1131 */ 1132 if (ISSET(zst->zst_swflags, TIOCFLAG_SOFTCAR) || 1133 ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 1134 SET(cflag, CLOCAL); 1135 CLR(cflag, HUPCL); 1136 } 1137 1138 /* 1139 * Only whack the UART when params change. 1140 * Some callers need to clear tp->t_ospeed 1141 * to make sure initialization gets done. 1142 */ 1143 if (tp->t_ospeed == ospeed && 1144 tp->t_cflag == cflag) 1145 return (0); 1146 1147 /* 1148 * Call MD functions to deal with changed 1149 * clock modes or H/W flow control modes. 1150 * The BRG divisor is set now. (reg 12,13) 1151 */ 1152 error = zs_set_speed(cs, ospeed); 1153 if (error) 1154 return (error); 1155 error = zs_set_modes(cs, cflag); 1156 if (error) 1157 return (error); 1158 1159 /* 1160 * Block interrupts so that state will not 1161 * be altered until we are done setting it up. 1162 * 1163 * Initial values in cs_preg are set before 1164 * our attach routine is called. The master 1165 * interrupt enable is handled by zsc.c 1166 * 1167 */ 1168 s = splzs(); 1169 simple_lock(&cs->cs_lock); 1170 1171 /* 1172 * Recalculate which status ints to enable. 1173 */ 1174 zs_maskintr(zst); 1175 1176 /* Recompute character size bits. */ 1177 tmp3 = cs->cs_preg[3]; 1178 tmp5 = cs->cs_preg[5]; 1179 CLR(tmp3, ZSWR3_RXSIZE); 1180 CLR(tmp5, ZSWR5_TXSIZE); 1181 switch (ISSET(cflag, CSIZE)) { 1182 case CS5: 1183 SET(tmp3, ZSWR3_RX_5); 1184 SET(tmp5, ZSWR5_TX_5); 1185 break; 1186 case CS6: 1187 SET(tmp3, ZSWR3_RX_6); 1188 SET(tmp5, ZSWR5_TX_6); 1189 break; 1190 case CS7: 1191 SET(tmp3, ZSWR3_RX_7); 1192 SET(tmp5, ZSWR5_TX_7); 1193 break; 1194 case CS8: 1195 SET(tmp3, ZSWR3_RX_8); 1196 SET(tmp5, ZSWR5_TX_8); 1197 break; 1198 } 1199 cs->cs_preg[3] = tmp3; 1200 cs->cs_preg[5] = tmp5; 1201 1202 /* 1203 * Recompute the stop bits and parity bits. Note that 1204 * zs_set_speed() may have set clock selection bits etc. 1205 * in wr4, so those must preserved. 1206 */ 1207 tmp4 = cs->cs_preg[4]; 1208 CLR(tmp4, ZSWR4_SBMASK | ZSWR4_PARMASK); 1209 if (ISSET(cflag, CSTOPB)) 1210 SET(tmp4, ZSWR4_TWOSB); 1211 else 1212 SET(tmp4, ZSWR4_ONESB); 1213 if (!ISSET(cflag, PARODD)) 1214 SET(tmp4, ZSWR4_EVENP); 1215 if (ISSET(cflag, PARENB)) 1216 SET(tmp4, ZSWR4_PARENB); 1217 cs->cs_preg[4] = tmp4; 1218 1219 /* And copy to tty. */ 1220 tp->t_ispeed = 0; 1221 tp->t_ospeed = ospeed; 1222 tp->t_cflag = cflag; 1223 1224 /* 1225 * If nothing is being transmitted, set up new current values, 1226 * else mark them as pending. 1227 */ 1228 if (!cs->cs_heldchange) { 1229 if (zst->zst_tx_busy) { 1230 zst->zst_heldtbc = zst->zst_tbc; 1231 zst->zst_tbc = 0; 1232 cs->cs_heldchange = 1; 1233 } else 1234 zs_loadchannelregs(cs); 1235 } 1236 1237 /* 1238 * If hardware flow control is disabled, turn off the buffer water 1239 * marks and unblock any soft flow control state. Otherwise, enable 1240 * the water marks. 1241 */ 1242 if (!ISSET(cflag, CHWFLOW)) { 1243 zst->zst_r_hiwat = 0; 1244 zst->zst_r_lowat = 0; 1245 if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1246 CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1247 zst->zst_rx_ready = 1; 1248 cs->cs_softreq = 1; 1249 } 1250 if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 1251 CLR(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 1252 zs_hwiflow(zst); 1253 } 1254 } else { 1255 zst->zst_r_hiwat = zstty_rbuf_hiwat; 1256 zst->zst_r_lowat = zstty_rbuf_lowat; 1257 } 1258 1259 /* 1260 * Force a recheck of the hardware carrier and flow control status, 1261 * since we may have changed which bits we're looking at. 1262 */ 1263 zstty_stint(cs, 1); 1264 1265 simple_unlock(&cs->cs_lock); 1266 splx(s); 1267 1268 /* 1269 * If hardware flow control is disabled, unblock any hard flow control 1270 * state. 1271 */ 1272 if (!ISSET(cflag, CHWFLOW)) { 1273 if (zst->zst_tx_stopped) { 1274 zst->zst_tx_stopped = 0; 1275 zsstart(tp); 1276 } 1277 } 1278 1279 zstty_softint(cs); 1280 1281 return (0); 1282 } 1283 1284 /* 1285 * Compute interrupt enable bits and set in the pending bits. Called both 1286 * in zsparam() and when PPS (pulse per second timing) state changes. 1287 * Must be called at splzs(). 1288 */ 1289 static void 1290 zs_maskintr(zst) 1291 struct zstty_softc *zst; 1292 { 1293 struct zs_chanstate *cs = zst->zst_cs; 1294 int tmp15; 1295 1296 cs->cs_rr0_mask = cs->cs_rr0_cts | cs->cs_rr0_dcd; 1297 if (zst->zst_ppsmask != 0) 1298 cs->cs_rr0_mask |= cs->cs_rr0_pps; 1299 tmp15 = cs->cs_preg[15]; 1300 if (ISSET(cs->cs_rr0_mask, ZSRR0_DCD)) 1301 SET(tmp15, ZSWR15_DCD_IE); 1302 else 1303 CLR(tmp15, ZSWR15_DCD_IE); 1304 if (ISSET(cs->cs_rr0_mask, ZSRR0_CTS)) 1305 SET(tmp15, ZSWR15_CTS_IE); 1306 else 1307 CLR(tmp15, ZSWR15_CTS_IE); 1308 cs->cs_preg[15] = tmp15; 1309 } 1310 1311 1312 /* 1313 * Raise or lower modem control (DTR/RTS) signals. If a character is 1314 * in transmission, the change is deferred. 1315 * Called at splzs() and with the channel lock held. 1316 */ 1317 static void 1318 zs_modem(zst, onoff) 1319 struct zstty_softc *zst; 1320 int onoff; 1321 { 1322 struct zs_chanstate *cs = zst->zst_cs, *ccs; 1323 1324 if (cs->cs_wr5_dtr == 0) 1325 return; 1326 1327 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs); 1328 1329 if (onoff) 1330 SET(ccs->cs_preg[5], cs->cs_wr5_dtr); 1331 else 1332 CLR(ccs->cs_preg[5], cs->cs_wr5_dtr); 1333 1334 if (!cs->cs_heldchange) { 1335 if (zst->zst_tx_busy) { 1336 zst->zst_heldtbc = zst->zst_tbc; 1337 zst->zst_tbc = 0; 1338 cs->cs_heldchange = 1; 1339 } else 1340 zs_loadchannelregs(cs); 1341 } 1342 } 1343 1344 /* 1345 * Set modem bits. 1346 * Called at splzs() and with the channel lock held. 1347 */ 1348 static void 1349 tiocm_to_zs(zst, how, ttybits) 1350 struct zstty_softc *zst; 1351 u_long how; 1352 int ttybits; 1353 { 1354 struct zs_chanstate *cs = zst->zst_cs, *ccs; 1355 u_char zsbits; 1356 1357 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs); 1358 1359 zsbits = 0; 1360 if (ISSET(ttybits, TIOCM_DTR)) 1361 SET(zsbits, ZSWR5_DTR); 1362 if (ISSET(ttybits, TIOCM_RTS)) 1363 SET(zsbits, ZSWR5_RTS); 1364 1365 switch (how) { 1366 case TIOCMBIC: 1367 CLR(ccs->cs_preg[5], zsbits); 1368 break; 1369 1370 case TIOCMBIS: 1371 SET(ccs->cs_preg[5], zsbits); 1372 break; 1373 1374 case TIOCMSET: 1375 CLR(ccs->cs_preg[5], ZSWR5_RTS | ZSWR5_DTR); 1376 SET(ccs->cs_preg[5], zsbits); 1377 break; 1378 } 1379 1380 if (!cs->cs_heldchange) { 1381 if (zst->zst_tx_busy) { 1382 zst->zst_heldtbc = zst->zst_tbc; 1383 zst->zst_tbc = 0; 1384 cs->cs_heldchange = 1; 1385 } else 1386 zs_loadchannelregs(cs); 1387 } 1388 } 1389 1390 /* 1391 * Get modem bits. 1392 * Called at splzs() and with the channel lock held. 1393 */ 1394 static int 1395 zs_to_tiocm(zst) 1396 struct zstty_softc *zst; 1397 { 1398 struct zs_chanstate *cs = zst->zst_cs, *ccs; 1399 u_char zsbits; 1400 int ttybits = 0; 1401 1402 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs); 1403 1404 zsbits = ccs->cs_preg[5]; 1405 if (ISSET(zsbits, ZSWR5_DTR)) 1406 SET(ttybits, TIOCM_DTR); 1407 if (ISSET(zsbits, ZSWR5_RTS)) 1408 SET(ttybits, TIOCM_RTS); 1409 1410 zsbits = cs->cs_rr0; 1411 if (ISSET(zsbits, ZSRR0_DCD)) 1412 SET(ttybits, TIOCM_CD); 1413 if (ISSET(zsbits, ZSRR0_CTS)) 1414 SET(ttybits, TIOCM_CTS); 1415 1416 return (ttybits); 1417 } 1418 1419 /* 1420 * Try to block or unblock input using hardware flow-control. 1421 * This is called by kern/tty.c if MDMBUF|CRTSCTS is set, and 1422 * if this function returns non-zero, the TS_TBLOCK flag will 1423 * be set or cleared according to the "block" arg passed. 1424 */ 1425 int 1426 zshwiflow(tp, block) 1427 struct tty *tp; 1428 int block; 1429 { 1430 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(tp->t_dev)); 1431 struct zs_chanstate *cs = zst->zst_cs; 1432 int s; 1433 1434 if (cs->cs_wr5_rts == 0) 1435 return (0); 1436 1437 s = splzs(); 1438 simple_lock(&cs->cs_lock); 1439 if (block) { 1440 if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1441 SET(zst->zst_rx_flags, RX_TTY_BLOCKED); 1442 zs_hwiflow(zst); 1443 } 1444 } else { 1445 if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1446 CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1447 zst->zst_rx_ready = 1; 1448 cs->cs_softreq = 1; 1449 } 1450 if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1451 CLR(zst->zst_rx_flags, RX_TTY_BLOCKED); 1452 zs_hwiflow(zst); 1453 } 1454 } 1455 simple_unlock(&cs->cs_lock); 1456 splx(s); 1457 return (1); 1458 } 1459 1460 /* 1461 * Internal version of zshwiflow 1462 * Called at splzs() and with the channel lock held. 1463 */ 1464 static void 1465 zs_hwiflow(zst) 1466 struct zstty_softc *zst; 1467 { 1468 struct zs_chanstate *cs = zst->zst_cs, *ccs; 1469 1470 if (cs->cs_wr5_rts == 0) 1471 return; 1472 1473 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs); 1474 1475 if (ISSET(zst->zst_rx_flags, RX_ANY_BLOCK)) { 1476 CLR(ccs->cs_preg[5], cs->cs_wr5_rts); 1477 CLR(ccs->cs_creg[5], cs->cs_wr5_rts); 1478 } else { 1479 SET(ccs->cs_preg[5], cs->cs_wr5_rts); 1480 SET(ccs->cs_creg[5], cs->cs_wr5_rts); 1481 } 1482 zs_write_reg(ccs, 5, ccs->cs_creg[5]); 1483 } 1484 1485 1486 /**************************************************************** 1487 * Interface to the lower layer (zscc) 1488 ****************************************************************/ 1489 1490 #define integrate static inline 1491 integrate void zstty_rxsoft(struct zstty_softc *, struct tty *); 1492 integrate void zstty_txsoft(struct zstty_softc *, struct tty *); 1493 integrate void zstty_stsoft(struct zstty_softc *, struct tty *); 1494 static void zstty_diag(void *); 1495 1496 /* 1497 * Receiver Ready interrupt. 1498 * Called at splzs() and with the channel lock held. 1499 */ 1500 static void 1501 zstty_rxint(cs) 1502 struct zs_chanstate *cs; 1503 { 1504 struct zstty_softc *zst = cs->cs_private; 1505 u_char *put, *end; 1506 u_int cc; 1507 u_char rr0, rr1, c; 1508 1509 end = zst->zst_ebuf; 1510 put = zst->zst_rbput; 1511 cc = zst->zst_rbavail; 1512 1513 while (cc > 0) { 1514 /* 1515 * First read the status, because reading the received char 1516 * destroys the status of this char. 1517 */ 1518 rr1 = zs_read_reg(cs, 1); 1519 c = zs_read_data(cs); 1520 1521 if (ISSET(rr1, ZSRR1_FE | ZSRR1_DO | ZSRR1_PE)) { 1522 /* Clear the receive error. */ 1523 zs_write_csr(cs, ZSWR0_RESET_ERRORS); 1524 } 1525 1526 cn_check_magic(zst->zst_tty->t_dev, c, zstty_cnm_state); 1527 put[0] = c; 1528 put[1] = rr1; 1529 put += 2; 1530 if (put >= end) 1531 put = zst->zst_rbuf; 1532 cc--; 1533 1534 rr0 = zs_read_csr(cs); 1535 if (!ISSET(rr0, ZSRR0_RX_READY)) 1536 break; 1537 } 1538 1539 /* 1540 * Current string of incoming characters ended because 1541 * no more data was available or we ran out of space. 1542 * Schedule a receive event if any data was received. 1543 * If we're out of space, turn off receive interrupts. 1544 */ 1545 zst->zst_rbput = put; 1546 zst->zst_rbavail = cc; 1547 if (!ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1548 zst->zst_rx_ready = 1; 1549 cs->cs_softreq = 1; 1550 } 1551 1552 /* 1553 * See if we are in danger of overflowing a buffer. If 1554 * so, use hardware flow control to ease the pressure. 1555 */ 1556 if (!ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED) && 1557 cc < zst->zst_r_hiwat) { 1558 SET(zst->zst_rx_flags, RX_IBUF_BLOCKED); 1559 zs_hwiflow(zst); 1560 } 1561 1562 /* 1563 * If we're out of space, disable receive interrupts 1564 * until the queue has drained a bit. 1565 */ 1566 if (!cc) { 1567 SET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED); 1568 CLR(cs->cs_preg[1], ZSWR1_RIE); 1569 cs->cs_creg[1] = cs->cs_preg[1]; 1570 zs_write_reg(cs, 1, cs->cs_creg[1]); 1571 } 1572 1573 #if 0 1574 printf("%xH%04d\n", zst->zst_rx_flags, zst->zst_rbavail); 1575 #endif 1576 } 1577 1578 /* 1579 * Transmitter Ready interrupt. 1580 * Called at splzs() and with the channel lock held. 1581 */ 1582 static void 1583 zstty_txint(cs) 1584 struct zs_chanstate *cs; 1585 { 1586 struct zstty_softc *zst = cs->cs_private; 1587 1588 /* 1589 * If we've delayed a parameter change, do it now, and restart 1590 * output. 1591 */ 1592 if (cs->cs_heldchange) { 1593 zs_loadchannelregs(cs); 1594 cs->cs_heldchange = 0; 1595 zst->zst_tbc = zst->zst_heldtbc; 1596 zst->zst_heldtbc = 0; 1597 } 1598 1599 /* Output the next character in the buffer, if any. */ 1600 if (zst->zst_tbc > 0) { 1601 zs_write_data(cs, *zst->zst_tba); 1602 zst->zst_tbc--; 1603 zst->zst_tba++; 1604 } else { 1605 /* Disable transmit completion interrupts if necessary. */ 1606 if (ISSET(cs->cs_preg[1], ZSWR1_TIE)) { 1607 CLR(cs->cs_preg[1], ZSWR1_TIE); 1608 cs->cs_creg[1] = cs->cs_preg[1]; 1609 zs_write_reg(cs, 1, cs->cs_creg[1]); 1610 } 1611 if (zst->zst_tx_busy) { 1612 zst->zst_tx_busy = 0; 1613 zst->zst_tx_done = 1; 1614 cs->cs_softreq = 1; 1615 } 1616 } 1617 } 1618 1619 /* 1620 * Status Change interrupt. 1621 * Called at splzs() and with the channel lock held. 1622 */ 1623 static void 1624 zstty_stint(cs, force) 1625 struct zs_chanstate *cs; 1626 int force; 1627 { 1628 struct zstty_softc *zst = cs->cs_private; 1629 u_char rr0, delta; 1630 1631 rr0 = zs_read_csr(cs); 1632 zs_write_csr(cs, ZSWR0_RESET_STATUS); 1633 1634 /* 1635 * Check here for console break, so that we can abort 1636 * even when interrupts are locking up the machine. 1637 */ 1638 if (ISSET(rr0, ZSRR0_BREAK)) 1639 cn_check_magic(zst->zst_tty->t_dev, CNC_BREAK, zstty_cnm_state); 1640 1641 if (!force) 1642 delta = rr0 ^ cs->cs_rr0; 1643 else 1644 delta = cs->cs_rr0_mask; 1645 cs->cs_rr0 = rr0; 1646 1647 if (ISSET(delta, cs->cs_rr0_mask)) { 1648 SET(cs->cs_rr0_delta, delta); 1649 1650 /* 1651 * Pulse-per-second clock signal on edge of DCD? 1652 */ 1653 if (ISSET(delta, zst->zst_ppsmask)) { 1654 struct timeval tv; 1655 if (ISSET(rr0, zst->zst_ppsmask) == zst->zst_ppsassert) { 1656 /* XXX nanotime() */ 1657 microtime(&tv); 1658 TIMEVAL_TO_TIMESPEC(&tv, 1659 &zst->ppsinfo.assert_timestamp); 1660 if (zst->ppsparam.mode & PPS_OFFSETASSERT) { 1661 timespecadd(&zst->ppsinfo.assert_timestamp, 1662 &zst->ppsparam.assert_offset, 1663 &zst->ppsinfo.assert_timestamp); 1664 } 1665 1666 #ifdef PPS_SYNC 1667 if (pps_kc_hardpps_source == zst && 1668 pps_kc_hardpps_mode & PPS_CAPTUREASSERT) { 1669 hardpps(&tv, tv.tv_usec); 1670 } 1671 #endif 1672 zst->ppsinfo.assert_sequence++; 1673 zst->ppsinfo.current_mode = zst->ppsparam.mode; 1674 } else if (ISSET(rr0, zst->zst_ppsmask) == 1675 zst->zst_ppsclear) { 1676 /* XXX nanotime() */ 1677 microtime(&tv); 1678 TIMEVAL_TO_TIMESPEC(&tv, 1679 &zst->ppsinfo.clear_timestamp); 1680 if (zst->ppsparam.mode & PPS_OFFSETCLEAR) { 1681 timespecadd(&zst->ppsinfo.clear_timestamp, 1682 &zst->ppsparam.clear_offset, 1683 &zst->ppsinfo.clear_timestamp); 1684 } 1685 1686 #ifdef PPS_SYNC 1687 if (pps_kc_hardpps_source == zst && 1688 pps_kc_hardpps_mode & PPS_CAPTURECLEAR) { 1689 hardpps(&tv, tv.tv_usec); 1690 } 1691 #endif 1692 zst->ppsinfo.clear_sequence++; 1693 zst->ppsinfo.current_mode = zst->ppsparam.mode; 1694 } 1695 } 1696 1697 /* 1698 * Stop output immediately if we lose the output 1699 * flow control signal or carrier detect. 1700 */ 1701 if (ISSET(~rr0, cs->cs_rr0_mask)) { 1702 zst->zst_tbc = 0; 1703 zst->zst_heldtbc = 0; 1704 } 1705 1706 zst->zst_st_check = 1; 1707 cs->cs_softreq = 1; 1708 } 1709 } 1710 1711 void 1712 zstty_diag(arg) 1713 void *arg; 1714 { 1715 struct zstty_softc *zst = arg; 1716 int overflows, floods; 1717 int s; 1718 1719 s = splzs(); 1720 overflows = zst->zst_overflows; 1721 zst->zst_overflows = 0; 1722 floods = zst->zst_floods; 1723 zst->zst_floods = 0; 1724 zst->zst_errors = 0; 1725 splx(s); 1726 1727 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1728 zst->zst_dev.dv_xname, 1729 overflows, overflows == 1 ? "" : "s", 1730 floods, floods == 1 ? "" : "s"); 1731 } 1732 1733 integrate void 1734 zstty_rxsoft(zst, tp) 1735 struct zstty_softc *zst; 1736 struct tty *tp; 1737 { 1738 struct zs_chanstate *cs = zst->zst_cs; 1739 int (*rint)(int, struct tty *) = tp->t_linesw->l_rint; 1740 u_char *get, *end; 1741 u_int cc, scc; 1742 u_char rr1; 1743 int code; 1744 int s; 1745 1746 end = zst->zst_ebuf; 1747 get = zst->zst_rbget; 1748 scc = cc = zstty_rbuf_size - zst->zst_rbavail; 1749 1750 if (cc == zstty_rbuf_size) { 1751 zst->zst_floods++; 1752 if (zst->zst_errors++ == 0) 1753 callout_reset(&zst->zst_diag_ch, 60 * hz, 1754 zstty_diag, zst); 1755 } 1756 1757 /* If not yet open, drop the entire buffer content here */ 1758 if (!ISSET(tp->t_state, TS_ISOPEN)) { 1759 get += cc << 1; 1760 if (get >= end) 1761 get -= zstty_rbuf_size << 1; 1762 cc = 0; 1763 } 1764 while (cc) { 1765 code = get[0]; 1766 rr1 = get[1]; 1767 if (ISSET(rr1, ZSRR1_DO | ZSRR1_FE | ZSRR1_PE)) { 1768 if (ISSET(rr1, ZSRR1_DO)) { 1769 zst->zst_overflows++; 1770 if (zst->zst_errors++ == 0) 1771 callout_reset(&zst->zst_diag_ch, 1772 60 * hz, zstty_diag, zst); 1773 } 1774 if (ISSET(rr1, ZSRR1_FE)) 1775 SET(code, TTY_FE); 1776 if (ISSET(rr1, ZSRR1_PE)) 1777 SET(code, TTY_PE); 1778 } 1779 if ((*rint)(code, tp) == -1) { 1780 /* 1781 * The line discipline's buffer is out of space. 1782 */ 1783 if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1784 /* 1785 * We're either not using flow control, or the 1786 * line discipline didn't tell us to block for 1787 * some reason. Either way, we have no way to 1788 * know when there's more space available, so 1789 * just drop the rest of the data. 1790 */ 1791 get += cc << 1; 1792 if (get >= end) 1793 get -= zstty_rbuf_size << 1; 1794 cc = 0; 1795 } else { 1796 /* 1797 * Don't schedule any more receive processing 1798 * until the line discipline tells us there's 1799 * space available (through comhwiflow()). 1800 * Leave the rest of the data in the input 1801 * buffer. 1802 */ 1803 SET(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1804 } 1805 break; 1806 } 1807 get += 2; 1808 if (get >= end) 1809 get = zst->zst_rbuf; 1810 cc--; 1811 } 1812 1813 if (cc != scc) { 1814 zst->zst_rbget = get; 1815 s = splzs(); 1816 simple_lock(&cs->cs_lock); 1817 cc = zst->zst_rbavail += scc - cc; 1818 /* Buffers should be ok again, release possible block. */ 1819 if (cc >= zst->zst_r_lowat) { 1820 if (ISSET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED)) { 1821 CLR(zst->zst_rx_flags, RX_IBUF_OVERFLOWED); 1822 SET(cs->cs_preg[1], ZSWR1_RIE); 1823 cs->cs_creg[1] = cs->cs_preg[1]; 1824 zs_write_reg(cs, 1, cs->cs_creg[1]); 1825 } 1826 if (ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED)) { 1827 CLR(zst->zst_rx_flags, RX_IBUF_BLOCKED); 1828 zs_hwiflow(zst); 1829 } 1830 } 1831 simple_unlock(&cs->cs_lock); 1832 splx(s); 1833 } 1834 1835 #if 0 1836 printf("%xS%04d\n", zst->zst_rx_flags, zst->zst_rbavail); 1837 #endif 1838 } 1839 1840 integrate void 1841 zstty_txsoft(zst, tp) 1842 struct zstty_softc *zst; 1843 struct tty *tp; 1844 { 1845 struct zs_chanstate *cs = zst->zst_cs; 1846 int s; 1847 1848 s = splzs(); 1849 simple_lock(&cs->cs_lock); 1850 CLR(tp->t_state, TS_BUSY); 1851 if (ISSET(tp->t_state, TS_FLUSH)) 1852 CLR(tp->t_state, TS_FLUSH); 1853 else 1854 ndflush(&tp->t_outq, (int)(zst->zst_tba - tp->t_outq.c_cf)); 1855 simple_unlock(&cs->cs_lock); 1856 splx(s); 1857 (*tp->t_linesw->l_start)(tp); 1858 } 1859 1860 integrate void 1861 zstty_stsoft(zst, tp) 1862 struct zstty_softc *zst; 1863 struct tty *tp; 1864 { 1865 struct zs_chanstate *cs = zst->zst_cs; 1866 u_char rr0, delta; 1867 int s; 1868 1869 s = splzs(); 1870 simple_lock(&cs->cs_lock); 1871 rr0 = cs->cs_rr0; 1872 delta = cs->cs_rr0_delta; 1873 cs->cs_rr0_delta = 0; 1874 simple_unlock(&cs->cs_lock); 1875 splx(s); 1876 1877 if (ISSET(delta, cs->cs_rr0_dcd)) { 1878 /* 1879 * Inform the tty layer that carrier detect changed. 1880 */ 1881 (void) (*tp->t_linesw->l_modem)(tp, ISSET(rr0, ZSRR0_DCD)); 1882 } 1883 1884 if (ISSET(delta, cs->cs_rr0_cts)) { 1885 /* Block or unblock output according to flow control. */ 1886 if (ISSET(rr0, cs->cs_rr0_cts)) { 1887 zst->zst_tx_stopped = 0; 1888 (*tp->t_linesw->l_start)(tp); 1889 } else { 1890 zst->zst_tx_stopped = 1; 1891 } 1892 } 1893 } 1894 1895 /* 1896 * Software interrupt. Called at zssoft 1897 * 1898 * The main job to be done here is to empty the input ring 1899 * by passing its contents up to the tty layer. The ring is 1900 * always emptied during this operation, therefore the ring 1901 * must not be larger than the space after "high water" in 1902 * the tty layer, or the tty layer might drop our input. 1903 * 1904 * Note: an "input blockage" condition is assumed to exist if 1905 * EITHER the TS_TBLOCK flag or zst_rx_blocked flag is set. 1906 */ 1907 static void 1908 zstty_softint(cs) 1909 struct zs_chanstate *cs; 1910 { 1911 struct zstty_softc *zst = cs->cs_private; 1912 struct tty *tp = zst->zst_tty; 1913 int s; 1914 1915 s = spltty(); 1916 1917 if (zst->zst_rx_ready) { 1918 zst->zst_rx_ready = 0; 1919 zstty_rxsoft(zst, tp); 1920 } 1921 1922 if (zst->zst_st_check) { 1923 zst->zst_st_check = 0; 1924 zstty_stsoft(zst, tp); 1925 } 1926 1927 if (zst->zst_tx_done) { 1928 zst->zst_tx_done = 0; 1929 zstty_txsoft(zst, tp); 1930 } 1931 1932 splx(s); 1933 } 1934 1935 struct zsops zsops_tty = { 1936 zstty_rxint, /* receive char available */ 1937 zstty_stint, /* external/status */ 1938 zstty_txint, /* xmit buffer empty */ 1939 zstty_softint, /* process software interrupt */ 1940 }; 1941 1942 #ifdef ZS_TXDMA 1943 void 1944 zstty_txdma_int(arg) 1945 void *arg; 1946 { 1947 struct zs_chanstate *cs = arg; 1948 struct zstty_softc *zst = cs->cs_private; 1949 1950 zst->zst_tba += zst->zst_tbc; 1951 zst->zst_tbc = 0; 1952 1953 if (zst->zst_tx_busy) { 1954 zst->zst_tx_busy = 0; 1955 zst->zst_tx_done = 1; 1956 cs->cs_softreq = 1; 1957 } 1958 } 1959 #endif 1960
Indexes created Sun Sep 28 16:09:52 GMT 2025