z8530tty.c revision 1.119
1/* $NetBSD: z8530tty.c,v 1.119 2007/12/22 15:45:15 ad 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 1.119 2007/12/22 15:45:15 ad Exp $"); 141 142#include "opt_kgdb.h" 143#include "opt_ntp.h" 144 145#include <sys/param.h> 146#include <sys/systm.h> 147#include <sys/proc.h> 148#include <sys/device.h> 149#include <sys/conf.h> 150#include <sys/file.h> 151#include <sys/ioctl.h> 152#include <sys/malloc.h> 153#include <sys/timepps.h> 154#include <sys/tty.h> 155#include <sys/time.h> 156#include <sys/kernel.h> 157#include <sys/syslog.h> 158#include <sys/kauth.h> 159 160#include <dev/ic/z8530reg.h> 161#include <machine/z8530var.h> 162 163#include <dev/cons.h> 164 165#include "locators.h" 166 167/* 168 * How many input characters we can buffer. 169 * The port-specific var.h may override this. 170 * Note: must be a power of two! 171 */ 172#ifndef ZSTTY_RING_SIZE 173#define ZSTTY_RING_SIZE 2048 174#endif 175 176static struct cnm_state zstty_cnm_state; 177/* 178 * Make this an option variable one can patch. 179 * But be warned: this must be a power of 2! 180 */ 181u_int zstty_rbuf_size = ZSTTY_RING_SIZE; 182 183/* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */ 184u_int zstty_rbuf_hiwat = (ZSTTY_RING_SIZE * 1) / 4; 185u_int zstty_rbuf_lowat = (ZSTTY_RING_SIZE * 3) / 4; 186 187#ifndef __HAVE_TIMECOUNTER 188static int zsppscap = 189 PPS_TSFMT_TSPEC | 190 PPS_CAPTUREASSERT | 191 PPS_CAPTURECLEAR | 192 PPS_OFFSETASSERT | PPS_OFFSETCLEAR; 193#endif /* __HAVE_TIMECOUNTER */ 194 195struct zstty_softc { 196 struct device zst_dev; /* required first: base device */ 197 struct tty *zst_tty; 198 struct zs_chanstate *zst_cs; 199 200 struct callout zst_diag_ch; 201 202 u_int zst_overflows, 203 zst_floods, 204 zst_errors; 205 206 int zst_hwflags, /* see z8530var.h */ 207 zst_swflags; /* TIOCFLAG_SOFTCAR, ... <ttycom.h> */ 208 209 u_int zst_r_hiwat, 210 zst_r_lowat; 211 u_char *volatile zst_rbget, 212 *volatile zst_rbput; 213 volatile u_int zst_rbavail; 214 u_char *zst_rbuf, 215 *zst_ebuf; 216 217 /* 218 * The transmit byte count and address are used for pseudo-DMA 219 * output in the hardware interrupt code. PDMA can be suspended 220 * to get pending changes done; heldtbc is used for this. It can 221 * also be stopped for ^S; this sets TS_TTSTOP in tp->t_state. 222 */ 223 u_char *zst_tba; /* transmit buffer address */ 224 u_int zst_tbc, /* transmit byte count */ 225 zst_heldtbc; /* held tbc while xmission stopped */ 226 227 /* Flags to communicate with zstty_softint() */ 228 volatile u_char zst_rx_flags, /* receiver blocked */ 229#define RX_TTY_BLOCKED 0x01 230#define RX_TTY_OVERFLOWED 0x02 231#define RX_IBUF_BLOCKED 0x04 232#define RX_IBUF_OVERFLOWED 0x08 233#define RX_ANY_BLOCK 0x0f 234 zst_tx_busy, /* working on an output chunk */ 235 zst_tx_done, /* done with one output chunk */ 236 zst_tx_stopped, /* H/W level stop (lost CTS) */ 237 zst_st_check, /* got a status interrupt */ 238 zst_rx_ready; 239 240 /* PPS signal on DCD, with or without inkernel clock disciplining */ 241 u_char zst_ppsmask; /* pps signal mask */ 242#ifdef __HAVE_TIMECOUNTER 243 struct pps_state zst_pps_state; 244#else /* !__HAVE_TIMECOUNTER */ 245 u_char zst_ppsassert; /* pps leading edge */ 246 u_char zst_ppsclear; /* pps trailing edge */ 247 pps_info_t ppsinfo; 248 pps_params_t ppsparam; 249#endif /* !__HAVE_TIMECOUNTER */ 250}; 251 252/* Definition of the driver for autoconfig. */ 253static int zstty_match(struct device *, struct cfdata *, void *); 254static void zstty_attach(struct device *, struct device *, void *); 255 256CFATTACH_DECL(zstty, sizeof(struct zstty_softc), 257 zstty_match, zstty_attach, NULL, NULL); 258 259extern struct cfdriver zstty_cd; 260 261dev_type_open(zsopen); 262dev_type_close(zsclose); 263dev_type_read(zsread); 264dev_type_write(zswrite); 265dev_type_ioctl(zsioctl); 266dev_type_stop(zsstop); 267dev_type_tty(zstty); 268dev_type_poll(zspoll); 269 270const struct cdevsw zstty_cdevsw = { 271 zsopen, zsclose, zsread, zswrite, zsioctl, 272 zsstop, zstty, zspoll, nommap, ttykqfilter, D_TTY 273}; 274 275struct zsops zsops_tty; 276 277static void zs_shutdown(struct zstty_softc *); 278static void zsstart(struct tty *); 279static int zsparam(struct tty *, struct termios *); 280static void zs_modem(struct zstty_softc *, int); 281static void tiocm_to_zs(struct zstty_softc *, u_long, int); 282static int zs_to_tiocm(struct zstty_softc *); 283static int zshwiflow(struct tty *, int); 284static void zs_hwiflow(struct zstty_softc *); 285static void zs_maskintr(struct zstty_softc *); 286 287/* Low-level routines. */ 288static void zstty_rxint (struct zs_chanstate *); 289static void zstty_stint (struct zs_chanstate *, int); 290static void zstty_txint (struct zs_chanstate *); 291static void zstty_softint(struct zs_chanstate *); 292static void zstty_softint1(struct zs_chanstate *); 293 294#define ZSUNIT(x) (minor(x) & 0x7ffff) 295#define ZSDIALOUT(x) (minor(x) & 0x80000) 296 297struct tty *zstty_get_tty_from_dev(struct device *); 298 299/* 300 * XXX get the (struct tty *) out of a (struct device *) we trust to be a 301 * (struct zstty_softc *) - needed by sparc/dev/zs.c, sparc64/dev/zs.c, 302 * sun3/dev/zs.c and sun2/dev/zs.c will probably need it at some point 303 */ 304 305struct tty * 306zstty_get_tty_from_dev(struct device *dev) 307{ 308 struct zstty_softc *sc = (struct zstty_softc *)dev; 309 310 return sc->zst_tty; 311} 312 313/* 314 * zstty_match: how is this zs channel configured? 315 */ 316int 317zstty_match(parent, cf, aux) 318 struct device *parent; 319 struct cfdata *cf; 320 void *aux; 321{ 322 struct zsc_attach_args *args = aux; 323 324 /* Exact match is better than wildcard. */ 325 if (cf->zsccf_channel == args->channel) 326 return 2; 327 328 /* This driver accepts wildcard. */ 329 if (cf->zsccf_channel == ZSCCF_CHANNEL_DEFAULT) 330 return 1; 331 332 return 0; 333} 334 335void 336zstty_attach(parent, self, aux) 337 struct device *parent, *self; 338 void *aux; 339 340{ 341 struct zsc_softc *zsc = (void *) parent; 342 struct zstty_softc *zst = (void *) self; 343 struct cfdata *cf = device_cfdata(self); 344 struct zsc_attach_args *args = aux; 345 struct zs_chanstate *cs; 346 struct tty *tp; 347 int channel, tty_unit; 348 dev_t dev; 349 const char *i, *o; 350 int dtr_on; 351 int resetbit; 352 353 callout_init(&zst->zst_diag_ch, 0); 354 cn_init_magic(&zstty_cnm_state); 355 356 tty_unit = device_unit(&zst->zst_dev); 357 channel = args->channel; 358 cs = zsc->zsc_cs[channel]; 359 cs->cs_private = zst; 360 cs->cs_ops = &zsops_tty; 361 362 zst->zst_cs = cs; 363 zst->zst_swflags = cf->cf_flags; /* softcar, etc. */ 364 zst->zst_hwflags = args->hwflags; 365 dev = makedev(cdevsw_lookup_major(&zstty_cdevsw), tty_unit); 366 367 if (zst->zst_swflags) 368 printf(" flags 0x%x", zst->zst_swflags); 369 370 /* 371 * Check whether we serve as a console device. 372 * XXX - split console input/output channels aren't 373 * supported yet on /dev/console 374 */ 375 i = o = NULL; 376 if ((zst->zst_hwflags & ZS_HWFLAG_CONSOLE_INPUT) != 0) { 377 i = "input"; 378 if ((args->hwflags & ZS_HWFLAG_USE_CONSDEV) != 0) { 379 args->consdev->cn_dev = dev; 380 cn_tab->cn_pollc = args->consdev->cn_pollc; 381 cn_tab->cn_getc = args->consdev->cn_getc; 382 } 383 cn_tab->cn_dev = dev; 384 /* Set console magic to BREAK */ 385 cn_set_magic("\047\001"); 386 } 387 if ((zst->zst_hwflags & ZS_HWFLAG_CONSOLE_OUTPUT) != 0) { 388 o = "output"; 389 if ((args->hwflags & ZS_HWFLAG_USE_CONSDEV) != 0) { 390 cn_tab->cn_putc = args->consdev->cn_putc; 391 } 392 cn_tab->cn_dev = dev; 393 } 394 if (i != NULL || o != NULL) 395 printf(" (console %s)", i ? (o ? "i/o" : i) : o); 396 397#ifdef KGDB 398 if (zs_check_kgdb(cs, dev)) { 399 /* 400 * Allow kgdb to "take over" this port. Returns true 401 * if this serial port is in-use by kgdb. 402 */ 403 printf(" (kgdb)\n"); 404 /* 405 * This is the kgdb port (exclusive use) 406 * so skip the normal attach code. 407 */ 408 return; 409 } 410#endif 411 printf("\n"); 412 413 tp = ttymalloc(); 414 tp->t_dev = dev; 415 tp->t_oproc = zsstart; 416 tp->t_param = zsparam; 417 tp->t_hwiflow = zshwiflow; 418 tty_attach(tp); 419 420 zst->zst_tty = tp; 421 zst->zst_rbuf = malloc(zstty_rbuf_size << 1, M_DEVBUF, M_NOWAIT); 422 if (zst->zst_rbuf == NULL) { 423 aprint_error("%s: unable to allocate ring buffer\n", 424 zst->zst_dev.dv_xname); 425 return; 426 } 427 zst->zst_ebuf = zst->zst_rbuf + (zstty_rbuf_size << 1); 428 /* Disable the high water mark. */ 429 zst->zst_r_hiwat = 0; 430 zst->zst_r_lowat = 0; 431 zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf; 432 zst->zst_rbavail = zstty_rbuf_size; 433 434 /* if there are no enable/disable functions, assume the device 435 is always enabled */ 436 if (!cs->enable) 437 cs->enabled = 1; 438 439 /* 440 * Hardware init 441 */ 442 dtr_on = 0; 443 resetbit = 0; 444 if (ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 445 /* Call zsparam similar to open. */ 446 struct termios t; 447 448 /* Wait a while for previous console output to complete */ 449 DELAY(10000); 450 451 /* Setup the "new" parameters in t. */ 452 t.c_ispeed = 0; 453 t.c_ospeed = cs->cs_defspeed; 454 t.c_cflag = cs->cs_defcflag; 455 456 /* 457 * Turn on receiver and status interrupts. 458 * We defer the actual write of the register to zsparam(), 459 * but we must make sure status interrupts are turned on by 460 * the time zsparam() reads the initial rr0 state. 461 */ 462 SET(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE); 463 464 /* Make sure zsparam will see changes. */ 465 tp->t_ospeed = 0; 466 (void) zsparam(tp, &t); 467 468 /* Make sure DTR is on now. */ 469 dtr_on = 1; 470 471 } else if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_NORESET)) { 472 /* Not the console; may need reset. */ 473 resetbit = (channel == 0) ? ZSWR9_A_RESET : ZSWR9_B_RESET; 474 } 475 476 mutex_spin_enter(&cs->cs_lock); 477 if (resetbit) 478 zs_write_reg(cs, 9, resetbit); 479 zs_modem(zst, dtr_on); 480 mutex_spin_exit(&cs->cs_lock); 481} 482 483 484/* 485 * Return pointer to our tty. 486 */ 487struct tty * 488zstty(dev) 489 dev_t dev; 490{ 491 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 492 493 return (zst->zst_tty); 494} 495 496 497void 498zs_shutdown(zst) 499 struct zstty_softc *zst; 500{ 501 struct zs_chanstate *cs = zst->zst_cs; 502 struct tty *tp = zst->zst_tty; 503 504 mutex_spin_enter(&cs->cs_lock); 505 506 /* If we were asserting flow control, then deassert it. */ 507 SET(zst->zst_rx_flags, RX_IBUF_BLOCKED); 508 zs_hwiflow(zst); 509 510 /* Clear any break condition set with TIOCSBRK. */ 511 zs_break(cs, 0); 512 513#ifndef __HAVE_TIMECOUNTER 514 /* Turn off PPS capture on last close. */ 515 zst->zst_ppsmask = 0; 516 zst->ppsparam.mode = 0; 517#endif /* __HAVE_TIMECOUNTER */ 518 519 /* 520 * Hang up if necessary. Wait a bit, so the other side has time to 521 * notice even if we immediately open the port again. 522 */ 523 if (ISSET(tp->t_cflag, HUPCL)) { 524 zs_modem(zst, 0); 525 mutex_spin_exit(&cs->cs_lock); 526 /* 527 * XXX - another process is not prevented from opening 528 * the device during our sleep. 529 */ 530 (void) tsleep(cs, TTIPRI, ttclos, hz); 531 /* Re-check state in case we were opened during our sleep */ 532 if (ISSET(tp->t_state, TS_ISOPEN) || tp->t_wopen != 0) 533 return; 534 535 mutex_spin_enter(&cs->cs_lock); 536 } 537 538 /* Turn off interrupts if not the console. */ 539 if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 540 CLR(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE); 541 cs->cs_creg[1] = cs->cs_preg[1]; 542 zs_write_reg(cs, 1, cs->cs_creg[1]); 543 } 544 545 /* Call the power management hook. */ 546 if (cs->disable) { 547#ifdef DIAGNOSTIC 548 if (!cs->enabled) 549 panic("zs_shutdown: not enabled?"); 550#endif 551 (*cs->disable)(zst->zst_cs); 552 } 553 554 mutex_spin_exit(&cs->cs_lock); 555} 556 557/* 558 * Open a zs serial (tty) port. 559 */ 560int 561zsopen(dev, flags, mode, l) 562 dev_t dev; 563 int flags; 564 int mode; 565 struct lwp *l; 566{ 567 struct zstty_softc *zst; 568 struct zs_chanstate *cs; 569 struct tty *tp; 570 int error; 571 572 zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 573 if (zst == NULL) 574 return (ENXIO); 575 576 tp = zst->zst_tty; 577 cs = zst->zst_cs; 578 579 /* If KGDB took the line, then tp==NULL */ 580 if (tp == NULL) 581 return (EBUSY); 582 583 if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp)) 584 return (EBUSY); 585 586 mutex_spin_enter(&tty_lock); 587 588 /* 589 * Do the following iff this is a first open. 590 */ 591 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 592 struct termios t; 593 594 tp->t_dev = dev; 595 596 /* Call the power management hook. */ 597 if (cs->enable) { 598 if ((*cs->enable)(cs)) { 599 mutex_spin_exit(&tty_lock); 600 printf("%s: device enable failed\n", 601 zst->zst_dev.dv_xname); 602 return (EIO); 603 } 604 } 605 606 /* 607 * Initialize the termios status to the defaults. Add in the 608 * sticky bits from TIOCSFLAGS. 609 */ 610 t.c_ispeed = 0; 611 t.c_ospeed = cs->cs_defspeed; 612 t.c_cflag = cs->cs_defcflag; 613 if (ISSET(zst->zst_swflags, TIOCFLAG_CLOCAL)) 614 SET(t.c_cflag, CLOCAL); 615 if (ISSET(zst->zst_swflags, TIOCFLAG_CRTSCTS)) 616 SET(t.c_cflag, CRTSCTS); 617 if (ISSET(zst->zst_swflags, TIOCFLAG_CDTRCTS)) 618 SET(t.c_cflag, CDTRCTS); 619 if (ISSET(zst->zst_swflags, TIOCFLAG_MDMBUF)) 620 SET(t.c_cflag, MDMBUF); 621 622 mutex_spin_enter(&cs->cs_lock); 623 624 /* 625 * Turn on receiver and status interrupts. 626 * We defer the actual write of the register to zsparam(), 627 * but we must make sure status interrupts are turned on by 628 * the time zsparam() reads the initial rr0 state. 629 */ 630 SET(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE); 631 632 /* Clear PPS capture state on first open. */ 633 zst->zst_ppsmask = 0; 634#ifdef __HAVE_TIMECOUNTER 635 memset(&zst->zst_pps_state, 0, sizeof(zst->zst_pps_state)); 636 zst->zst_pps_state.ppscap = PPS_CAPTUREASSERT | PPS_CAPTURECLEAR; 637 pps_init(&zst->zst_pps_state); 638#else /* !__HAVE_TIMECOUNTER */ 639 zst->ppsparam.mode = 0; 640#endif /* !__HAVE_TIMECOUNTER */ 641 642 mutex_spin_exit(&cs->cs_lock); 643 644 /* Make sure zsparam will see changes. */ 645 tp->t_ospeed = 0; 646 (void) zsparam(tp, &t); 647 648 /* 649 * Note: zsparam has done: cflag, ispeed, ospeed 650 * so we just need to do: iflag, oflag, lflag, cc 651 * For "raw" mode, just leave all zeros. 652 */ 653 if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_RAW)) { 654 tp->t_iflag = TTYDEF_IFLAG; 655 tp->t_oflag = TTYDEF_OFLAG; 656 tp->t_lflag = TTYDEF_LFLAG; 657 } else { 658 tp->t_iflag = 0; 659 tp->t_oflag = 0; 660 tp->t_lflag = 0; 661 } 662 ttychars(tp); 663 ttsetwater(tp); 664 665 mutex_spin_enter(&cs->cs_lock); 666 667 /* 668 * Turn on DTR. We must always do this, even if carrier is not 669 * present, because otherwise we'd have to use TIOCSDTR 670 * immediately after setting CLOCAL, which applications do not 671 * expect. We always assert DTR while the device is open 672 * unless explicitly requested to deassert it. 673 */ 674 zs_modem(zst, 1); 675 676 /* Clear the input ring, and unblock. */ 677 zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf; 678 zst->zst_rbavail = zstty_rbuf_size; 679 zs_iflush(cs); 680 CLR(zst->zst_rx_flags, RX_ANY_BLOCK); 681 zs_hwiflow(zst); 682 683 mutex_spin_exit(&cs->cs_lock); 684 } 685 686 mutex_spin_exit(&tty_lock); 687 688 error = ttyopen(tp, ZSDIALOUT(dev), ISSET(flags, O_NONBLOCK)); 689 if (error) 690 goto bad; 691 692 error = (*tp->t_linesw->l_open)(dev, tp); 693 if (error) 694 goto bad; 695 696 return (0); 697 698bad: 699 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 700 /* 701 * We failed to open the device, and nobody else had it opened. 702 * Clean up the state as appropriate. 703 */ 704 zs_shutdown(zst); 705 } 706 707 return (error); 708} 709 710/* 711 * Close a zs serial port. 712 */ 713int 714zsclose(dev, flags, mode, l) 715 dev_t dev; 716 int flags; 717 int mode; 718 struct lwp *l; 719{ 720 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 721 struct tty *tp = zst->zst_tty; 722 723 /* XXX This is for cons.c. */ 724 if (!ISSET(tp->t_state, TS_ISOPEN)) 725 return 0; 726 727 (*tp->t_linesw->l_close)(tp, flags); 728 ttyclose(tp); 729 730 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 731 /* 732 * Although we got a last close, the device may still be in 733 * use; e.g. if this was the dialout node, and there are still 734 * processes waiting for carrier on the non-dialout node. 735 */ 736 zs_shutdown(zst); 737 } 738 739 return (0); 740} 741 742/* 743 * Read/write zs serial port. 744 */ 745int 746zsread(dev, uio, flags) 747 dev_t dev; 748 struct uio *uio; 749 int flags; 750{ 751 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 752 struct tty *tp = zst->zst_tty; 753 754 return ((*tp->t_linesw->l_read)(tp, uio, flags)); 755} 756 757int 758zswrite(dev, uio, flags) 759 dev_t dev; 760 struct uio *uio; 761 int flags; 762{ 763 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 764 struct tty *tp = zst->zst_tty; 765 766 return ((*tp->t_linesw->l_write)(tp, uio, flags)); 767} 768 769int 770zspoll(dev, events, l) 771 dev_t dev; 772 int events; 773 struct lwp *l; 774{ 775 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 776 struct tty *tp = zst->zst_tty; 777 778 return ((*tp->t_linesw->l_poll)(tp, events, l)); 779} 780 781int 782zsioctl(dev, cmd, data, flag, l) 783 dev_t dev; 784 u_long cmd; 785 void *data; 786 int flag; 787 struct lwp *l; 788{ 789 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 790 struct zs_chanstate *cs = zst->zst_cs; 791 struct tty *tp = zst->zst_tty; 792 int error; 793 794 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 795 if (error != EPASSTHROUGH) 796 return (error); 797 798 error = ttioctl(tp, cmd, data, flag, l); 799 if (error != EPASSTHROUGH) 800 return (error); 801 802#ifdef ZS_MD_IOCTL 803 error = ZS_MD_IOCTL(cs, cmd, data); 804 if (error != EPASSTHROUGH) 805 return (error); 806#endif /* ZS_MD_IOCTL */ 807 808 error = 0; 809 810 mutex_spin_enter(&cs->cs_lock); 811 812 switch (cmd) { 813 case TIOCSBRK: 814 zs_break(cs, 1); 815 break; 816 817 case TIOCCBRK: 818 zs_break(cs, 0); 819 break; 820 821 case TIOCGFLAGS: 822 *(int *)data = zst->zst_swflags; 823 break; 824 825 case TIOCSFLAGS: 826 error = kauth_authorize_device_tty(l->l_cred, 827 KAUTH_DEVICE_TTY_PRIVSET, tp); 828 if (error) 829 break; 830 zst->zst_swflags = *(int *)data; 831 break; 832 833 case TIOCSDTR: 834 zs_modem(zst, 1); 835 break; 836 837 case TIOCCDTR: 838 zs_modem(zst, 0); 839 break; 840 841 case TIOCMSET: 842 case TIOCMBIS: 843 case TIOCMBIC: 844 tiocm_to_zs(zst, cmd, *(int *)data); 845 break; 846 847 case TIOCMGET: 848 *(int *)data = zs_to_tiocm(zst); 849 break; 850 851#ifdef __HAVE_TIMECOUNTER 852 case PPS_IOC_CREATE: 853 case PPS_IOC_DESTROY: 854 case PPS_IOC_GETPARAMS: 855 case PPS_IOC_SETPARAMS: 856 case PPS_IOC_GETCAP: 857 case PPS_IOC_FETCH: 858#ifdef PPS_SYNC 859 case PPS_IOC_KCBIND: 860#endif 861 error = pps_ioctl(cmd, data, &zst->zst_pps_state); 862 if (zst->zst_pps_state.ppsparam.mode & PPS_CAPTUREBOTH) 863 zst->zst_ppsmask = ZSRR0_DCD; 864 else 865 zst->zst_ppsmask = 0; 866 break; 867#else /* !__HAVE_TIMECOUNTER */ 868 case PPS_IOC_CREATE: 869 break; 870 871 case PPS_IOC_DESTROY: 872 break; 873 874 case PPS_IOC_GETPARAMS: { 875 pps_params_t *pp; 876 pp = (pps_params_t *)data; 877 *pp = zst->ppsparam; 878 break; 879 } 880 881 case PPS_IOC_SETPARAMS: { 882 pps_params_t *pp; 883 int mode; 884 if (cs->cs_rr0_pps == 0) { 885 error = EINVAL; 886 break; 887 } 888 pp = (pps_params_t *)data; 889 if (pp->mode & ~zsppscap) { 890 error = EINVAL; 891 break; 892 } 893 zst->ppsparam = *pp; 894 /* 895 * compute masks from user-specified timestamp state. 896 */ 897 mode = zst->ppsparam.mode; 898 switch (mode & PPS_CAPTUREBOTH) { 899 case 0: 900 zst->zst_ppsmask = 0; 901 break; 902 903 case PPS_CAPTUREASSERT: 904 zst->zst_ppsmask = ZSRR0_DCD; 905 zst->zst_ppsassert = ZSRR0_DCD; 906 zst->zst_ppsclear = -1; 907 break; 908 909 case PPS_CAPTURECLEAR: 910 zst->zst_ppsmask = ZSRR0_DCD; 911 zst->zst_ppsassert = -1; 912 zst->zst_ppsclear = 0; 913 break; 914 915 case PPS_CAPTUREBOTH: 916 zst->zst_ppsmask = ZSRR0_DCD; 917 zst->zst_ppsassert = ZSRR0_DCD; 918 zst->zst_ppsclear = 0; 919 break; 920 921 default: 922 error = EINVAL; 923 break; 924 } 925 926 /* 927 * Now update interrupts. 928 */ 929 zs_maskintr(zst); 930 /* 931 * If nothing is being transmitted, set up new current values, 932 * else mark them as pending. 933 */ 934 if (!cs->cs_heldchange) { 935 if (zst->zst_tx_busy) { 936 zst->zst_heldtbc = zst->zst_tbc; 937 zst->zst_tbc = 0; 938 cs->cs_heldchange = 1; 939 } else 940 zs_loadchannelregs(cs); 941 } 942 943 break; 944 } 945 946 case PPS_IOC_GETCAP: 947 *(int *)data = zsppscap; 948 break; 949 950 case PPS_IOC_FETCH: { 951 pps_info_t *pi; 952 pi = (pps_info_t *)data; 953 *pi = zst->ppsinfo; 954 break; 955 } 956 957#ifdef PPS_SYNC 958 case PPS_IOC_KCBIND: { 959 int edge = (*(int *)data) & PPS_CAPTUREBOTH; 960 961 if (edge == 0) { 962 /* 963 * remove binding for this source; ignore 964 * the request if this is not the current 965 * hardpps source 966 */ 967 if (pps_kc_hardpps_source == zst) { 968 pps_kc_hardpps_source = NULL; 969 pps_kc_hardpps_mode = 0; 970 } 971 } else { 972 /* 973 * bind hardpps to this source, replacing any 974 * previously specified source or edges 975 */ 976 pps_kc_hardpps_source = zst; 977 pps_kc_hardpps_mode = edge; 978 } 979 break; 980 } 981#endif /* PPS_SYNC */ 982#endif /* !__HAVE_TIMECOUNTER */ 983 984 case TIOCDCDTIMESTAMP: /* XXX old, overloaded API used by xntpd v3 */ 985 if (cs->cs_rr0_pps == 0) { 986 error = EINVAL; 987 break; 988 } 989#ifdef __HAVE_TIMECOUNTER 990#ifndef PPS_TRAILING_EDGE 991 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 992 &zst->zst_pps_state.ppsinfo.assert_timestamp); 993#else 994 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 995 &zst->zst_pps_state.ppsinfo.clear_timestamp); 996#endif 997#else /* !__HAVE_TIMECOUNTER */ 998 zst->zst_ppsmask = ZSRR0_DCD; 999#ifndef PPS_TRAILING_EDGE 1000 zst->zst_ppsassert = ZSRR0_DCD; 1001 zst->zst_ppsclear = -1; 1002 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 1003 &zst->ppsinfo.assert_timestamp); 1004#else 1005 zst->zst_ppsassert = -1; 1006 zst->zst_ppsclear = 01; 1007 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 1008 &zst->ppsinfo.clear_timestamp); 1009#endif 1010#endif /* !__HAVE_TIMECOUNTER */ 1011 /* 1012 * Now update interrupts. 1013 */ 1014 zs_maskintr(zst); 1015 /* 1016 * If nothing is being transmitted, set up new current values, 1017 * else mark them as pending. 1018 */ 1019 if (!cs->cs_heldchange) { 1020 if (zst->zst_tx_busy) { 1021 zst->zst_heldtbc = zst->zst_tbc; 1022 zst->zst_tbc = 0; 1023 cs->cs_heldchange = 1; 1024 } else 1025 zs_loadchannelregs(cs); 1026 } 1027 1028 break; 1029 1030 default: 1031 error = EPASSTHROUGH; 1032 break; 1033 } 1034 1035 mutex_spin_exit(&cs->cs_lock); 1036 1037 return (error); 1038} 1039 1040/* 1041 * Start or restart transmission. 1042 */ 1043static void 1044zsstart(tp) 1045 struct tty *tp; 1046{ 1047 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(tp->t_dev)); 1048 struct zs_chanstate *cs = zst->zst_cs; 1049 u_char *tba; 1050 int tbc; 1051 1052 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 1053 return; 1054 if (zst->zst_tx_stopped) 1055 return; 1056 if (!ttypull(tp)) 1057 return; 1058 1059 /* Grab the first contiguous region of buffer space. */ 1060 tba = tp->t_outq.c_cf; 1061 tbc = ndqb(&tp->t_outq, 0); 1062 1063 mutex_spin_enter(&cs->cs_lock); 1064 1065 zst->zst_tba = tba; 1066 zst->zst_tbc = tbc; 1067 SET(tp->t_state, TS_BUSY); 1068 zst->zst_tx_busy = 1; 1069 1070#ifdef ZS_TXDMA 1071 if (zst->zst_tbc > 1) { 1072 zs_dma_setup(cs, zst->zst_tba, zst->zst_tbc); 1073 mutex_spin_exit(&cs->cs_lock); 1074 return; 1075 } 1076#endif 1077 1078 /* Enable transmit completion interrupts if necessary. */ 1079 if (!ISSET(cs->cs_preg[1], ZSWR1_TIE)) { 1080 SET(cs->cs_preg[1], ZSWR1_TIE); 1081 cs->cs_creg[1] = cs->cs_preg[1]; 1082 zs_write_reg(cs, 1, cs->cs_creg[1]); 1083 } 1084 1085 /* Output the first character of the contiguous buffer. */ 1086 zs_write_data(cs, *zst->zst_tba); 1087 zst->zst_tbc--; 1088 zst->zst_tba++; 1089 1090 mutex_spin_exit(&cs->cs_lock); 1091} 1092 1093/* 1094 * Stop output, e.g., for ^S or output flush. 1095 */ 1096void 1097zsstop(tp, flag) 1098 struct tty *tp; 1099 int flag; 1100{ 1101 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(tp->t_dev)); 1102 int s; 1103 1104 s = splzs(); 1105 if (ISSET(tp->t_state, TS_BUSY)) { 1106 /* Stop transmitting at the next chunk. */ 1107 zst->zst_tbc = 0; 1108 zst->zst_heldtbc = 0; 1109 if (!ISSET(tp->t_state, TS_TTSTOP)) 1110 SET(tp->t_state, TS_FLUSH); 1111 } 1112 splx(s); 1113} 1114 1115/* 1116 * Set ZS tty parameters from termios. 1117 * XXX - Should just copy the whole termios after 1118 * making sure all the changes could be done. 1119 */ 1120static int 1121zsparam(tp, t) 1122 struct tty *tp; 1123 struct termios *t; 1124{ 1125 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(tp->t_dev)); 1126 struct zs_chanstate *cs = zst->zst_cs; 1127 int ospeed; 1128 tcflag_t cflag; 1129 u_char tmp3, tmp4, tmp5; 1130 int error; 1131 1132 ospeed = t->c_ospeed; 1133 cflag = t->c_cflag; 1134 1135 /* Check requested parameters. */ 1136 if (ospeed < 0) 1137 return (EINVAL); 1138 if (t->c_ispeed && t->c_ispeed != ospeed) 1139 return (EINVAL); 1140 1141 /* 1142 * For the console, always force CLOCAL and !HUPCL, so that the port 1143 * is always active. 1144 */ 1145 if (ISSET(zst->zst_swflags, TIOCFLAG_SOFTCAR) || 1146 ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 1147 SET(cflag, CLOCAL); 1148 CLR(cflag, HUPCL); 1149 } 1150 1151 /* 1152 * Only whack the UART when params change. 1153 * Some callers need to clear tp->t_ospeed 1154 * to make sure initialization gets done. 1155 */ 1156 if (tp->t_ospeed == ospeed && 1157 tp->t_cflag == cflag) 1158 return (0); 1159 1160 /* 1161 * Call MD functions to deal with changed 1162 * clock modes or H/W flow control modes. 1163 * The BRG divisor is set now. (reg 12,13) 1164 */ 1165 error = zs_set_speed(cs, ospeed); 1166 if (error) 1167 return (error); 1168 error = zs_set_modes(cs, cflag); 1169 if (error) 1170 return (error); 1171 1172 /* 1173 * Block interrupts so that state will not 1174 * be altered until we are done setting it up. 1175 * 1176 * Initial values in cs_preg are set before 1177 * our attach routine is called. The master 1178 * interrupt enable is handled by zsc.c 1179 * 1180 */ 1181 mutex_spin_enter(&cs->cs_lock); 1182 1183 /* 1184 * Recalculate which status ints to enable. 1185 */ 1186 zs_maskintr(zst); 1187 1188 /* Recompute character size bits. */ 1189 tmp3 = cs->cs_preg[3]; 1190 tmp5 = cs->cs_preg[5]; 1191 CLR(tmp3, ZSWR3_RXSIZE); 1192 CLR(tmp5, ZSWR5_TXSIZE); 1193 switch (ISSET(cflag, CSIZE)) { 1194 case CS5: 1195 SET(tmp3, ZSWR3_RX_5); 1196 SET(tmp5, ZSWR5_TX_5); 1197 break; 1198 case CS6: 1199 SET(tmp3, ZSWR3_RX_6); 1200 SET(tmp5, ZSWR5_TX_6); 1201 break; 1202 case CS7: 1203 SET(tmp3, ZSWR3_RX_7); 1204 SET(tmp5, ZSWR5_TX_7); 1205 break; 1206 case CS8: 1207 SET(tmp3, ZSWR3_RX_8); 1208 SET(tmp5, ZSWR5_TX_8); 1209 break; 1210 } 1211 cs->cs_preg[3] = tmp3; 1212 cs->cs_preg[5] = tmp5; 1213 1214 /* 1215 * Recompute the stop bits and parity bits. Note that 1216 * zs_set_speed() may have set clock selection bits etc. 1217 * in wr4, so those must preserved. 1218 */ 1219 tmp4 = cs->cs_preg[4]; 1220 CLR(tmp4, ZSWR4_SBMASK | ZSWR4_PARMASK); 1221 if (ISSET(cflag, CSTOPB)) 1222 SET(tmp4, ZSWR4_TWOSB); 1223 else 1224 SET(tmp4, ZSWR4_ONESB); 1225 if (!ISSET(cflag, PARODD)) 1226 SET(tmp4, ZSWR4_EVENP); 1227 if (ISSET(cflag, PARENB)) 1228 SET(tmp4, ZSWR4_PARENB); 1229 cs->cs_preg[4] = tmp4; 1230 1231 /* And copy to tty. */ 1232 tp->t_ispeed = 0; 1233 tp->t_ospeed = ospeed; 1234 tp->t_cflag = cflag; 1235 1236 /* 1237 * If nothing is being transmitted, set up new current values, 1238 * else mark them as pending. 1239 */ 1240 if (!cs->cs_heldchange) { 1241 if (zst->zst_tx_busy) { 1242 zst->zst_heldtbc = zst->zst_tbc; 1243 zst->zst_tbc = 0; 1244 cs->cs_heldchange = 1; 1245 } else 1246 zs_loadchannelregs(cs); 1247 } 1248 1249 /* 1250 * If hardware flow control is disabled, turn off the buffer water 1251 * marks and unblock any soft flow control state. Otherwise, enable 1252 * the water marks. 1253 */ 1254 if (!ISSET(cflag, CHWFLOW)) { 1255 zst->zst_r_hiwat = 0; 1256 zst->zst_r_lowat = 0; 1257 if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1258 CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1259 zst->zst_rx_ready = 1; 1260 cs->cs_softreq = 1; 1261 } 1262 if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 1263 CLR(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 1264 zs_hwiflow(zst); 1265 } 1266 } else { 1267 zst->zst_r_hiwat = zstty_rbuf_hiwat; 1268 zst->zst_r_lowat = zstty_rbuf_lowat; 1269 } 1270 1271 /* 1272 * Force a recheck of the hardware carrier and flow control status, 1273 * since we may have changed which bits we're looking at. 1274 */ 1275 zstty_stint(cs, 1); 1276 1277 mutex_spin_exit(&cs->cs_lock); 1278 1279 /* 1280 * If hardware flow control is disabled, unblock any hard flow control 1281 * state. 1282 */ 1283 if (!ISSET(cflag, CHWFLOW)) { 1284 if (zst->zst_tx_stopped) { 1285 zst->zst_tx_stopped = 0; 1286 zsstart(tp); 1287 } 1288 } 1289 1290 zstty_softint1(cs); 1291 1292 return (0); 1293} 1294 1295/* 1296 * Compute interrupt enable bits and set in the pending bits. Called both 1297 * in zsparam() and when PPS (pulse per second timing) state changes. 1298 * Must be called at splzs(). 1299 */ 1300static void 1301zs_maskintr(zst) 1302 struct zstty_softc *zst; 1303{ 1304 struct zs_chanstate *cs = zst->zst_cs; 1305 int tmp15; 1306 1307 cs->cs_rr0_mask = cs->cs_rr0_cts | cs->cs_rr0_dcd; 1308 if (zst->zst_ppsmask != 0) 1309 cs->cs_rr0_mask |= cs->cs_rr0_pps; 1310 tmp15 = cs->cs_preg[15]; 1311 if (ISSET(cs->cs_rr0_mask, ZSRR0_DCD)) 1312 SET(tmp15, ZSWR15_DCD_IE); 1313 else 1314 CLR(tmp15, ZSWR15_DCD_IE); 1315 if (ISSET(cs->cs_rr0_mask, ZSRR0_CTS)) 1316 SET(tmp15, ZSWR15_CTS_IE); 1317 else 1318 CLR(tmp15, ZSWR15_CTS_IE); 1319 cs->cs_preg[15] = tmp15; 1320} 1321 1322 1323/* 1324 * Raise or lower modem control (DTR/RTS) signals. If a character is 1325 * in transmission, the change is deferred. 1326 * Called at splzs() and with the channel lock held. 1327 */ 1328static void 1329zs_modem(zst, onoff) 1330 struct zstty_softc *zst; 1331 int onoff; 1332{ 1333 struct zs_chanstate *cs = zst->zst_cs, *ccs; 1334 1335 if (cs->cs_wr5_dtr == 0) 1336 return; 1337 1338 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs); 1339 1340 if (onoff) 1341 SET(ccs->cs_preg[5], cs->cs_wr5_dtr); 1342 else 1343 CLR(ccs->cs_preg[5], cs->cs_wr5_dtr); 1344 1345 if (!cs->cs_heldchange) { 1346 if (zst->zst_tx_busy) { 1347 zst->zst_heldtbc = zst->zst_tbc; 1348 zst->zst_tbc = 0; 1349 cs->cs_heldchange = 1; 1350 } else 1351 zs_loadchannelregs(cs); 1352 } 1353} 1354 1355/* 1356 * Set modem bits. 1357 * Called at splzs() and with the channel lock held. 1358 */ 1359static void 1360tiocm_to_zs(zst, how, ttybits) 1361 struct zstty_softc *zst; 1362 u_long how; 1363 int ttybits; 1364{ 1365 struct zs_chanstate *cs = zst->zst_cs, *ccs; 1366 u_char zsbits; 1367 1368 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs); 1369 1370 zsbits = 0; 1371 if (ISSET(ttybits, TIOCM_DTR)) 1372 SET(zsbits, ZSWR5_DTR); 1373 if (ISSET(ttybits, TIOCM_RTS)) 1374 SET(zsbits, ZSWR5_RTS); 1375 1376 switch (how) { 1377 case TIOCMBIC: 1378 CLR(ccs->cs_preg[5], zsbits); 1379 break; 1380 1381 case TIOCMBIS: 1382 SET(ccs->cs_preg[5], zsbits); 1383 break; 1384 1385 case TIOCMSET: 1386 CLR(ccs->cs_preg[5], ZSWR5_RTS | ZSWR5_DTR); 1387 SET(ccs->cs_preg[5], zsbits); 1388 break; 1389 } 1390 1391 if (!cs->cs_heldchange) { 1392 if (zst->zst_tx_busy) { 1393 zst->zst_heldtbc = zst->zst_tbc; 1394 zst->zst_tbc = 0; 1395 cs->cs_heldchange = 1; 1396 } else 1397 zs_loadchannelregs(cs); 1398 } 1399} 1400 1401/* 1402 * Get modem bits. 1403 * Called at splzs() and with the channel lock held. 1404 */ 1405static int 1406zs_to_tiocm(zst) 1407 struct zstty_softc *zst; 1408{ 1409 struct zs_chanstate *cs = zst->zst_cs, *ccs; 1410 u_char zsbits; 1411 int ttybits = 0; 1412 1413 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs); 1414 1415 zsbits = ccs->cs_preg[5]; 1416 if (ISSET(zsbits, ZSWR5_DTR)) 1417 SET(ttybits, TIOCM_DTR); 1418 if (ISSET(zsbits, ZSWR5_RTS)) 1419 SET(ttybits, TIOCM_RTS); 1420 1421 zsbits = cs->cs_rr0; 1422 if (ISSET(zsbits, ZSRR0_DCD)) 1423 SET(ttybits, TIOCM_CD); 1424 if (ISSET(zsbits, ZSRR0_CTS)) 1425 SET(ttybits, TIOCM_CTS); 1426 1427 return (ttybits); 1428} 1429 1430/* 1431 * Try to block or unblock input using hardware flow-control. 1432 * This is called by kern/tty.c if MDMBUF|CRTSCTS is set, and 1433 * if this function returns non-zero, the TS_TBLOCK flag will 1434 * be set or cleared according to the "block" arg passed. 1435 */ 1436int 1437zshwiflow(tp, block) 1438 struct tty *tp; 1439 int block; 1440{ 1441 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(tp->t_dev)); 1442 struct zs_chanstate *cs = zst->zst_cs; 1443 1444 if (cs->cs_wr5_rts == 0) 1445 return (0); 1446 1447 mutex_spin_enter(&cs->cs_lock); 1448 if (block) { 1449 if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1450 SET(zst->zst_rx_flags, RX_TTY_BLOCKED); 1451 zs_hwiflow(zst); 1452 } 1453 } else { 1454 if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1455 CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1456 zst->zst_rx_ready = 1; 1457 cs->cs_softreq = 1; 1458 } 1459 if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1460 CLR(zst->zst_rx_flags, RX_TTY_BLOCKED); 1461 zs_hwiflow(zst); 1462 } 1463 } 1464 mutex_spin_exit(&cs->cs_lock); 1465 return (1); 1466} 1467 1468/* 1469 * Internal version of zshwiflow 1470 * Called at splzs() and with the channel lock held. 1471 */ 1472static void 1473zs_hwiflow(zst) 1474 struct zstty_softc *zst; 1475{ 1476 struct zs_chanstate *cs = zst->zst_cs, *ccs; 1477 1478 if (cs->cs_wr5_rts == 0) 1479 return; 1480 1481 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs); 1482 1483 if (ISSET(zst->zst_rx_flags, RX_ANY_BLOCK)) { 1484 CLR(ccs->cs_preg[5], cs->cs_wr5_rts); 1485 CLR(ccs->cs_creg[5], cs->cs_wr5_rts); 1486 } else { 1487 SET(ccs->cs_preg[5], cs->cs_wr5_rts); 1488 SET(ccs->cs_creg[5], cs->cs_wr5_rts); 1489 } 1490 zs_write_reg(ccs, 5, ccs->cs_creg[5]); 1491} 1492 1493 1494/**************************************************************** 1495 * Interface to the lower layer (zscc) 1496 ****************************************************************/ 1497 1498#define integrate static inline 1499integrate void zstty_rxsoft(struct zstty_softc *, struct tty *); 1500integrate void zstty_txsoft(struct zstty_softc *, struct tty *); 1501integrate void zstty_stsoft(struct zstty_softc *, struct tty *); 1502static void zstty_diag(void *); 1503 1504/* 1505 * Receiver Ready interrupt. 1506 * Called at splzs() and with the channel lock held. 1507 */ 1508static void 1509zstty_rxint(cs) 1510 struct zs_chanstate *cs; 1511{ 1512 struct zstty_softc *zst = cs->cs_private; 1513 u_char *put, *end; 1514 u_int cc; 1515 u_char rr0, rr1, c; 1516 1517 end = zst->zst_ebuf; 1518 put = zst->zst_rbput; 1519 cc = zst->zst_rbavail; 1520 1521 while (cc > 0) { 1522 /* 1523 * First read the status, because reading the received char 1524 * destroys the status of this char. 1525 */ 1526 rr1 = zs_read_reg(cs, 1); 1527 c = zs_read_data(cs); 1528 1529 if (ISSET(rr1, ZSRR1_FE | ZSRR1_DO | ZSRR1_PE)) { 1530 /* Clear the receive error. */ 1531 zs_write_csr(cs, ZSWR0_RESET_ERRORS); 1532 } 1533 1534 cn_check_magic(zst->zst_tty->t_dev, c, zstty_cnm_state); 1535 put[0] = c; 1536 put[1] = rr1; 1537 put += 2; 1538 if (put >= end) 1539 put = zst->zst_rbuf; 1540 cc--; 1541 1542 rr0 = zs_read_csr(cs); 1543 if (!ISSET(rr0, ZSRR0_RX_READY)) 1544 break; 1545 } 1546 1547 /* 1548 * Current string of incoming characters ended because 1549 * no more data was available or we ran out of space. 1550 * Schedule a receive event if any data was received. 1551 * If we're out of space, turn off receive interrupts. 1552 */ 1553 zst->zst_rbput = put; 1554 zst->zst_rbavail = cc; 1555 if (!ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1556 zst->zst_rx_ready = 1; 1557 cs->cs_softreq = 1; 1558 } 1559 1560 /* 1561 * See if we are in danger of overflowing a buffer. If 1562 * so, use hardware flow control to ease the pressure. 1563 */ 1564 if (!ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED) && 1565 cc < zst->zst_r_hiwat) { 1566 SET(zst->zst_rx_flags, RX_IBUF_BLOCKED); 1567 zs_hwiflow(zst); 1568 } 1569 1570 /* 1571 * If we're out of space, disable receive interrupts 1572 * until the queue has drained a bit. 1573 */ 1574 if (!cc) { 1575 SET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED); 1576 CLR(cs->cs_preg[1], ZSWR1_RIE); 1577 cs->cs_creg[1] = cs->cs_preg[1]; 1578 zs_write_reg(cs, 1, cs->cs_creg[1]); 1579 } 1580 1581#if 0 1582 printf("%xH%04d\n", zst->zst_rx_flags, zst->zst_rbavail); 1583#endif 1584} 1585 1586/* 1587 * Transmitter Ready interrupt. 1588 * Called at splzs() and with the channel lock held. 1589 */ 1590static void 1591zstty_txint(cs) 1592 struct zs_chanstate *cs; 1593{ 1594 struct zstty_softc *zst = cs->cs_private; 1595 1596 /* 1597 * If we've delayed a parameter change, do it now, and restart 1598 * output. 1599 */ 1600 if (cs->cs_heldchange) { 1601 zs_loadchannelregs(cs); 1602 cs->cs_heldchange = 0; 1603 zst->zst_tbc = zst->zst_heldtbc; 1604 zst->zst_heldtbc = 0; 1605 } 1606 1607 /* Output the next character in the buffer, if any. */ 1608 if (zst->zst_tbc > 0) { 1609 zs_write_data(cs, *zst->zst_tba); 1610 zst->zst_tbc--; 1611 zst->zst_tba++; 1612 } else { 1613 /* Disable transmit completion interrupts if necessary. */ 1614 if (ISSET(cs->cs_preg[1], ZSWR1_TIE)) { 1615 CLR(cs->cs_preg[1], ZSWR1_TIE); 1616 cs->cs_creg[1] = cs->cs_preg[1]; 1617 zs_write_reg(cs, 1, cs->cs_creg[1]); 1618 } 1619 if (zst->zst_tx_busy) { 1620 zst->zst_tx_busy = 0; 1621 zst->zst_tx_done = 1; 1622 cs->cs_softreq = 1; 1623 } 1624 } 1625} 1626 1627/* 1628 * Status Change interrupt. 1629 * Called at splzs() and with the channel lock held. 1630 */ 1631static void 1632zstty_stint(cs, force) 1633 struct zs_chanstate *cs; 1634 int force; 1635{ 1636 struct zstty_softc *zst = cs->cs_private; 1637 u_char rr0, delta; 1638 1639 rr0 = zs_read_csr(cs); 1640 zs_write_csr(cs, ZSWR0_RESET_STATUS); 1641 1642 /* 1643 * Check here for console break, so that we can abort 1644 * even when interrupts are locking up the machine. 1645 */ 1646 if (ISSET(rr0, ZSRR0_BREAK)) 1647 cn_check_magic(zst->zst_tty->t_dev, CNC_BREAK, zstty_cnm_state); 1648 1649 if (!force) 1650 delta = rr0 ^ cs->cs_rr0; 1651 else 1652 delta = cs->cs_rr0_mask; 1653 cs->cs_rr0 = rr0; 1654 1655 if (ISSET(delta, cs->cs_rr0_mask)) { 1656 SET(cs->cs_rr0_delta, delta); 1657 1658 /* 1659 * Pulse-per-second clock signal on edge of DCD? 1660 */ 1661 if (ISSET(delta, zst->zst_ppsmask)) { 1662#ifdef __HAVE_TIMECOUNTER 1663 if (zst->zst_pps_state.ppsparam.mode & PPS_CAPTUREBOTH) { 1664 pps_capture(&zst->zst_pps_state); 1665 pps_event(&zst->zst_pps_state, 1666 (ISSET(cs->cs_rr0, zst->zst_ppsmask)) 1667 ? PPS_CAPTUREASSERT 1668 : PPS_CAPTURECLEAR); 1669 } 1670#else /* !__HAVE_TIMECOUNTER */ 1671 struct timeval tv; 1672 if (ISSET(rr0, zst->zst_ppsmask) == zst->zst_ppsassert) { 1673 /* XXX nanotime() */ 1674 microtime(&tv); 1675 TIMEVAL_TO_TIMESPEC(&tv, 1676 &zst->ppsinfo.assert_timestamp); 1677 if (zst->ppsparam.mode & PPS_OFFSETASSERT) { 1678 timespecadd(&zst->ppsinfo.assert_timestamp, 1679 &zst->ppsparam.assert_offset, 1680 &zst->ppsinfo.assert_timestamp); 1681 } 1682 1683#ifdef PPS_SYNC 1684 if (pps_kc_hardpps_source == zst && 1685 pps_kc_hardpps_mode & PPS_CAPTUREASSERT) { 1686 hardpps(&tv, tv.tv_usec); 1687 } 1688#endif 1689 zst->ppsinfo.assert_sequence++; 1690 zst->ppsinfo.current_mode = zst->ppsparam.mode; 1691 } else if (ISSET(rr0, zst->zst_ppsmask) == 1692 zst->zst_ppsclear) { 1693 /* XXX nanotime() */ 1694 microtime(&tv); 1695 TIMEVAL_TO_TIMESPEC(&tv, 1696 &zst->ppsinfo.clear_timestamp); 1697 if (zst->ppsparam.mode & PPS_OFFSETCLEAR) { 1698 timespecadd(&zst->ppsinfo.clear_timestamp, 1699 &zst->ppsparam.clear_offset, 1700 &zst->ppsinfo.clear_timestamp); 1701 } 1702 1703#ifdef PPS_SYNC 1704 if (pps_kc_hardpps_source == zst && 1705 pps_kc_hardpps_mode & PPS_CAPTURECLEAR) { 1706 hardpps(&tv, tv.tv_usec); 1707 } 1708#endif 1709 zst->ppsinfo.clear_sequence++; 1710 zst->ppsinfo.current_mode = zst->ppsparam.mode; 1711 } 1712#endif /* !__HAVE_TIMECOUNTER */ 1713 } 1714 1715 /* 1716 * Stop output immediately if we lose the output 1717 * flow control signal or carrier detect. 1718 */ 1719 if (ISSET(~rr0, cs->cs_rr0_mask)) { 1720 zst->zst_tbc = 0; 1721 zst->zst_heldtbc = 0; 1722 } 1723 1724 zst->zst_st_check = 1; 1725 cs->cs_softreq = 1; 1726 } 1727} 1728 1729void 1730zstty_diag(arg) 1731 void *arg; 1732{ 1733 struct zstty_softc *zst = arg; 1734 int overflows, floods; 1735 int s; 1736 1737 s = splzs(); 1738 overflows = zst->zst_overflows; 1739 zst->zst_overflows = 0; 1740 floods = zst->zst_floods; 1741 zst->zst_floods = 0; 1742 zst->zst_errors = 0; 1743 splx(s); 1744 1745 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1746 zst->zst_dev.dv_xname, 1747 overflows, overflows == 1 ? "" : "s", 1748 floods, floods == 1 ? "" : "s"); 1749} 1750 1751integrate void 1752zstty_rxsoft(zst, tp) 1753 struct zstty_softc *zst; 1754 struct tty *tp; 1755{ 1756 struct zs_chanstate *cs = zst->zst_cs; 1757 int (*rint)(int, struct tty *) = tp->t_linesw->l_rint; 1758 u_char *get, *end; 1759 u_int cc, scc; 1760 u_char rr1; 1761 int code; 1762 1763 end = zst->zst_ebuf; 1764 get = zst->zst_rbget; 1765 scc = cc = zstty_rbuf_size - zst->zst_rbavail; 1766 1767 if (cc == zstty_rbuf_size) { 1768 zst->zst_floods++; 1769 if (zst->zst_errors++ == 0) 1770 callout_reset(&zst->zst_diag_ch, 60 * hz, 1771 zstty_diag, zst); 1772 } 1773 1774 /* If not yet open, drop the entire buffer content here */ 1775 if (!ISSET(tp->t_state, TS_ISOPEN)) { 1776 get += cc << 1; 1777 if (get >= end) 1778 get -= zstty_rbuf_size << 1; 1779 cc = 0; 1780 } 1781 while (cc) { 1782 code = get[0]; 1783 rr1 = get[1]; 1784 if (ISSET(rr1, ZSRR1_DO | ZSRR1_FE | ZSRR1_PE)) { 1785 if (ISSET(rr1, ZSRR1_DO)) { 1786 zst->zst_overflows++; 1787 if (zst->zst_errors++ == 0) 1788 callout_reset(&zst->zst_diag_ch, 1789 60 * hz, zstty_diag, zst); 1790 } 1791 if (ISSET(rr1, ZSRR1_FE)) 1792 SET(code, TTY_FE); 1793 if (ISSET(rr1, ZSRR1_PE)) 1794 SET(code, TTY_PE); 1795 } 1796 if ((*rint)(code, tp) == -1) { 1797 /* 1798 * The line discipline's buffer is out of space. 1799 */ 1800 if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1801 /* 1802 * We're either not using flow control, or the 1803 * line discipline didn't tell us to block for 1804 * some reason. Either way, we have no way to 1805 * know when there's more space available, so 1806 * just drop the rest of the data. 1807 */ 1808 get += cc << 1; 1809 if (get >= end) 1810 get -= zstty_rbuf_size << 1; 1811 cc = 0; 1812 } else { 1813 /* 1814 * Don't schedule any more receive processing 1815 * until the line discipline tells us there's 1816 * space available (through comhwiflow()). 1817 * Leave the rest of the data in the input 1818 * buffer. 1819 */ 1820 SET(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1821 } 1822 break; 1823 } 1824 get += 2; 1825 if (get >= end) 1826 get = zst->zst_rbuf; 1827 cc--; 1828 } 1829 1830 if (cc != scc) { 1831 zst->zst_rbget = get; 1832 mutex_spin_enter(&cs->cs_lock); 1833 cc = zst->zst_rbavail += scc - cc; 1834 /* Buffers should be ok again, release possible block. */ 1835 if (cc >= zst->zst_r_lowat) { 1836 if (ISSET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED)) { 1837 CLR(zst->zst_rx_flags, RX_IBUF_OVERFLOWED); 1838 SET(cs->cs_preg[1], ZSWR1_RIE); 1839 cs->cs_creg[1] = cs->cs_preg[1]; 1840 zs_write_reg(cs, 1, cs->cs_creg[1]); 1841 } 1842 if (ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED)) { 1843 CLR(zst->zst_rx_flags, RX_IBUF_BLOCKED); 1844 zs_hwiflow(zst); 1845 } 1846 } 1847 mutex_spin_exit(&cs->cs_lock); 1848 } 1849 1850#if 0 1851 printf("%xS%04d\n", zst->zst_rx_flags, zst->zst_rbavail); 1852#endif 1853} 1854 1855integrate void 1856zstty_txsoft(zst, tp) 1857 struct zstty_softc *zst; 1858 struct tty *tp; 1859{ 1860 struct zs_chanstate *cs = zst->zst_cs; 1861 1862 mutex_spin_enter(&cs->cs_lock); 1863 CLR(tp->t_state, TS_BUSY); 1864 if (ISSET(tp->t_state, TS_FLUSH)) 1865 CLR(tp->t_state, TS_FLUSH); 1866 else 1867 ndflush(&tp->t_outq, (int)(zst->zst_tba - tp->t_outq.c_cf)); 1868 mutex_spin_exit(&cs->cs_lock); 1869 (*tp->t_linesw->l_start)(tp); 1870} 1871 1872integrate void 1873zstty_stsoft(zst, tp) 1874 struct zstty_softc *zst; 1875 struct tty *tp; 1876{ 1877 struct zs_chanstate *cs = zst->zst_cs; 1878 u_char rr0, delta; 1879 1880 mutex_spin_enter(&cs->cs_lock); 1881 rr0 = cs->cs_rr0; 1882 delta = cs->cs_rr0_delta; 1883 cs->cs_rr0_delta = 0; 1884 mutex_spin_exit(&cs->cs_lock); 1885 1886 if (ISSET(delta, cs->cs_rr0_dcd)) { 1887 /* 1888 * Inform the tty layer that carrier detect changed. 1889 */ 1890 mutex_spin_exit(&tty_lock); 1891 (void) (*tp->t_linesw->l_modem)(tp, ISSET(rr0, ZSRR0_DCD)); 1892 mutex_spin_enter(&tty_lock); 1893 } 1894 1895 if (ISSET(delta, cs->cs_rr0_cts)) { 1896 /* Block or unblock output according to flow control. */ 1897 if (ISSET(rr0, cs->cs_rr0_cts)) { 1898 zst->zst_tx_stopped = 0; 1899 (*tp->t_linesw->l_start)(tp); 1900 } else { 1901 zst->zst_tx_stopped = 1; 1902 } 1903 } 1904} 1905 1906/* 1907 * Software interrupt. Called at zssoft 1908 * 1909 * The main job to be done here is to empty the input ring 1910 * by passing its contents up to the tty layer. The ring is 1911 * always emptied during this operation, therefore the ring 1912 * must not be larger than the space after "high water" in 1913 * the tty layer, or the tty layer might drop our input. 1914 * 1915 * Note: an "input blockage" condition is assumed to exist if 1916 * EITHER the TS_TBLOCK flag or zst_rx_blocked flag is set. 1917 */ 1918static void 1919zstty_softint(cs) 1920 struct zs_chanstate *cs; 1921{ 1922 1923 mutex_spin_enter(&tty_lock); 1924 zstty_softint1(cs); 1925 mutex_spin_exit(&tty_lock); 1926} 1927 1928static void 1929zstty_softint1(cs) 1930 struct zs_chanstate *cs; 1931{ 1932 struct zstty_softc *zst = cs->cs_private; 1933 struct tty *tp = zst->zst_tty; 1934 1935 1936 if (zst->zst_rx_ready) { 1937 zst->zst_rx_ready = 0; 1938 zstty_rxsoft(zst, tp); 1939 } 1940 1941 if (zst->zst_st_check) { 1942 zst->zst_st_check = 0; 1943 zstty_stsoft(zst, tp); 1944 } 1945 1946 if (zst->zst_tx_done) { 1947 zst->zst_tx_done = 0; 1948 zstty_txsoft(zst, tp); 1949 } 1950} 1951 1952struct zsops zsops_tty = { 1953 zstty_rxint, /* receive char available */ 1954 zstty_stint, /* external/status */ 1955 zstty_txint, /* xmit buffer empty */ 1956 zstty_softint, /* process software interrupt */ 1957}; 1958 1959#ifdef ZS_TXDMA 1960void 1961zstty_txdma_int(arg) 1962 void *arg; 1963{ 1964 struct zs_chanstate *cs = arg; 1965 struct zstty_softc *zst = cs->cs_private; 1966 1967 zst->zst_tba += zst->zst_tbc; 1968 zst->zst_tbc = 0; 1969 1970 if (zst->zst_tx_busy) { 1971 zst->zst_tx_busy = 0; 1972 zst->zst_tx_done = 1; 1973 cs->cs_softreq = 1; 1974 } 1975} 1976#endif 1977