z8530tty.c revision 1.64
1/* $NetBSD: z8530tty.c,v 1.64 2000/03/19 12:42:45 pk 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) 1994 Gordon W. Ross 35 * Copyright (c) 1992, 1993 36 * The Regents of the University of California. All rights reserved. 37 * 38 * This software was developed by the Computer Systems Engineering group 39 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 40 * contributed to Berkeley. 41 * 42 * All advertising materials mentioning features or use of this software 43 * must display the following acknowledgement: 44 * This product includes software developed by the University of 45 * California, Lawrence Berkeley Laboratory. 46 * 47 * Redistribution and use in source and binary forms, with or without 48 * modification, are permitted provided that the following conditions 49 * are met: 50 * 1. Redistributions of source code must retain the above copyright 51 * notice, this list of conditions and the following disclaimer. 52 * 2. Redistributions in binary form must reproduce the above copyright 53 * notice, this list of conditions and the following disclaimer in the 54 * documentation and/or other materials provided with the distribution. 55 * 3. All advertising materials mentioning features or use of this software 56 * must display the following acknowledgement: 57 * This product includes software developed by the University of 58 * California, Berkeley and its contributors. 59 * 4. Neither the name of the University nor the names of its contributors 60 * may be used to endorse or promote products derived from this software 61 * without specific prior written permission. 62 * 63 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 64 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 65 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 66 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 67 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 68 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 69 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 70 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 71 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 72 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 73 * SUCH DAMAGE. 74 * 75 * @(#)zs.c 8.1 (Berkeley) 7/19/93 76 */ 77 78/* 79 * Zilog Z8530 Dual UART driver (tty interface) 80 * 81 * This is the "slave" driver that will be attached to 82 * the "zsc" driver for plain "tty" async. serial lines. 83 * 84 * Credits, history: 85 * 86 * The original version of this code was the sparc/dev/zs.c driver 87 * as distributed with the Berkeley 4.4 Lite release. Since then, 88 * Gordon Ross reorganized the code into the current parent/child 89 * driver scheme, separating the Sun keyboard and mouse support 90 * into independent child drivers. 91 * 92 * RTS/CTS flow-control support was a collaboration of: 93 * Gordon Ross <gwr@netbsd.org>, 94 * Bill Studenmund <wrstuden@loki.stanford.edu> 95 * Ian Dall <Ian.Dall@dsto.defence.gov.au> 96 * 97 * The driver was massively overhauled in November 1997 by Charles Hannum, 98 * fixing *many* bugs, and substantially improving performance. 99 */ 100 101#include <sys/param.h> 102#include <sys/systm.h> 103#include <sys/proc.h> 104#include <sys/device.h> 105#include <sys/conf.h> 106#include <sys/file.h> 107#include <sys/ioctl.h> 108#include <sys/malloc.h> 109#include <sys/timepps.h> 110#include <sys/tty.h> 111#include <sys/time.h> 112#include <sys/kernel.h> 113#include <sys/syslog.h> 114 115#include <dev/ic/z8530reg.h> 116#include <machine/z8530var.h> 117 118#include <dev/cons.h> 119 120#include "locators.h" 121 122/* 123 * How many input characters we can buffer. 124 * The port-specific var.h may override this. 125 * Note: must be a power of two! 126 */ 127#ifndef ZSTTY_RING_SIZE 128#define ZSTTY_RING_SIZE 2048 129#endif 130 131/* 132 * Make this an option variable one can patch. 133 * But be warned: this must be a power of 2! 134 */ 135u_int zstty_rbuf_size = ZSTTY_RING_SIZE; 136 137/* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */ 138u_int zstty_rbuf_hiwat = (ZSTTY_RING_SIZE * 1) / 4; 139u_int zstty_rbuf_lowat = (ZSTTY_RING_SIZE * 3) / 4; 140 141static int zsppscap = 142 PPS_TSFMT_TSPEC | 143 PPS_CAPTUREASSERT | 144 PPS_CAPTURECLEAR | 145#ifdef PPS_SYNC 146 PPS_HARDPPSONASSERT | PPS_HARDPPSONCLEAR | 147#endif /* PPS_SYNC */ 148 PPS_OFFSETASSERT | PPS_OFFSETCLEAR; 149 150struct zstty_softc { 151 struct device zst_dev; /* required first: base device */ 152 struct tty *zst_tty; 153 struct zs_chanstate *zst_cs; 154 155 u_int zst_overflows, 156 zst_floods, 157 zst_errors; 158 159 int zst_hwflags, /* see z8530var.h */ 160 zst_swflags; /* TIOCFLAG_SOFTCAR, ... <ttycom.h> */ 161 162 u_int zst_r_hiwat, 163 zst_r_lowat; 164 u_char *volatile zst_rbget, 165 *volatile zst_rbput; 166 volatile u_int zst_rbavail; 167 u_char *zst_rbuf, 168 *zst_ebuf; 169 170 /* 171 * The transmit byte count and address are used for pseudo-DMA 172 * output in the hardware interrupt code. PDMA can be suspended 173 * to get pending changes done; heldtbc is used for this. It can 174 * also be stopped for ^S; this sets TS_TTSTOP in tp->t_state. 175 */ 176 u_char *zst_tba; /* transmit buffer address */ 177 u_int zst_tbc, /* transmit byte count */ 178 zst_heldtbc; /* held tbc while xmission stopped */ 179 180 /* Flags to communicate with zstty_softint() */ 181 volatile u_char zst_rx_flags, /* receiver blocked */ 182#define RX_TTY_BLOCKED 0x01 183#define RX_TTY_OVERFLOWED 0x02 184#define RX_IBUF_BLOCKED 0x04 185#define RX_IBUF_OVERFLOWED 0x08 186#define RX_ANY_BLOCK 0x0f 187 zst_tx_busy, /* working on an output chunk */ 188 zst_tx_done, /* done with one output chunk */ 189 zst_tx_stopped, /* H/W level stop (lost CTS) */ 190 zst_st_check, /* got a status interrupt */ 191 zst_rx_ready; 192 193 /* PPS signal on DCD, with or without inkernel clock disciplining */ 194 u_char zst_ppsmask; /* pps signal mask */ 195 u_char zst_ppsassert; /* pps leading edge */ 196 u_char zst_ppsclear; /* pps trailing edge */ 197 pps_info_t ppsinfo; 198 pps_params_t ppsparam; 199}; 200 201/* Macros to clear/set/test flags. */ 202#define SET(t, f) (t) |= (f) 203#define CLR(t, f) (t) &= ~(f) 204#define ISSET(t, f) ((t) & (f)) 205 206/* Definition of the driver for autoconfig. */ 207static int zstty_match(struct device *, struct cfdata *, void *); 208static void zstty_attach(struct device *, struct device *, void *); 209 210struct cfattach zstty_ca = { 211 sizeof(struct zstty_softc), zstty_match, zstty_attach 212}; 213 214extern struct cfdriver zstty_cd; 215 216struct zsops zsops_tty; 217 218/* Routines called from other code. */ 219cdev_decl(zs); /* open, close, read, write, ioctl, stop, ... */ 220 221static void zs_shutdown __P((struct zstty_softc *)); 222static void zsstart __P((struct tty *)); 223static int zsparam __P((struct tty *, struct termios *)); 224static void zs_modem __P((struct zstty_softc *, int)); 225static void tiocm_to_zs __P((struct zstty_softc *, int, int)); 226static int zs_to_tiocm __P((struct zstty_softc *)); 227static int zshwiflow __P((struct tty *, int)); 228static void zs_hwiflow __P((struct zstty_softc *)); 229static void zs_maskintr __P((struct zstty_softc *)); 230 231/* Low-level routines. */ 232static void zstty_rxint __P((struct zs_chanstate *)); 233static void zstty_stint __P((struct zs_chanstate *, int)); 234static void zstty_txint __P((struct zs_chanstate *)); 235static void zstty_softint __P((struct zs_chanstate *)); 236 237#define ZSUNIT(x) (minor(x) & 0x7ffff) 238#define ZSDIALOUT(x) (minor(x) & 0x80000) 239 240/* 241 * zstty_match: how is this zs channel configured? 242 */ 243int 244zstty_match(parent, cf, aux) 245 struct device *parent; 246 struct cfdata *cf; 247 void *aux; 248{ 249 struct zsc_attach_args *args = aux; 250 251 /* Exact match is better than wildcard. */ 252 if (cf->cf_loc[ZSCCF_CHANNEL] == args->channel) 253 return 2; 254 255 /* This driver accepts wildcard. */ 256 if (cf->cf_loc[ZSCCF_CHANNEL] == ZSCCF_CHANNEL_DEFAULT) 257 return 1; 258 259 return 0; 260} 261 262void 263zstty_attach(parent, self, aux) 264 struct device *parent, *self; 265 void *aux; 266 267{ 268 struct zsc_softc *zsc = (void *) parent; 269 struct zstty_softc *zst = (void *) self; 270 struct cfdata *cf = self->dv_cfdata; 271 struct zsc_attach_args *args = aux; 272 struct zs_chanstate *cs; 273 struct tty *tp; 274 int channel, s, tty_unit; 275 dev_t dev; 276 char *i, *o; 277 278 tty_unit = zst->zst_dev.dv_unit; 279 channel = args->channel; 280 cs = zsc->zsc_cs[channel]; 281 cs->cs_private = zst; 282 cs->cs_ops = &zsops_tty; 283 284 zst->zst_cs = cs; 285 zst->zst_swflags = cf->cf_flags; /* softcar, etc. */ 286 zst->zst_hwflags = args->hwflags; 287 dev = makedev(zs_major, tty_unit); 288 289 if (zst->zst_swflags) 290 printf(" flags 0x%x", zst->zst_swflags); 291 292 /* 293 * Check whether we serve as a console device. 294 * XXX - split console input/output channels aren't 295 * supported yet on /dev/console 296 */ 297 i = o = NULL; 298 if ((zst->zst_hwflags & ZS_HWFLAG_CONSOLE_INPUT) != 0) { 299 i = "input"; 300 if ((args->hwflags & ZS_HWFLAG_USE_CONSDEV) != 0) { 301 cn_tab->cn_pollc = args->consdev->cn_pollc; 302 cn_tab->cn_getc = args->consdev->cn_getc; 303 } 304 cn_tab->cn_dev = dev; 305 } 306 if ((zst->zst_hwflags & ZS_HWFLAG_CONSOLE_OUTPUT) != 0) { 307 o = "output"; 308 if ((args->hwflags & ZS_HWFLAG_USE_CONSDEV) != 0) { 309 cn_tab->cn_putc = args->consdev->cn_putc; 310 } 311 cn_tab->cn_dev = dev; 312 } 313 if (i != NULL || o != NULL) 314 printf(" (console %s)", i ? (o ? "i/o" : i) : o); 315 316#ifdef KGDB 317 if (zs_check_kgdb(cs, dev)) { 318 /* 319 * Allow kgdb to "take over" this port. Returns true 320 * if this serial port is in-use by kgdb. 321 */ 322 printf(" (kgdb)"); 323 /* 324 * This is the kgdb port (exclusive use) 325 * so skip the normal attach code. 326 */ 327 return; 328 } 329#endif 330 printf("\n"); 331 332 tp = ttymalloc(); 333 tp->t_dev = dev; 334 tp->t_oproc = zsstart; 335 tp->t_param = zsparam; 336 tp->t_hwiflow = zshwiflow; 337 tty_attach(tp); 338 339 zst->zst_tty = tp; 340 zst->zst_rbuf = malloc(zstty_rbuf_size << 1, M_DEVBUF, M_WAITOK); 341 zst->zst_ebuf = zst->zst_rbuf + (zstty_rbuf_size << 1); 342 /* Disable the high water mark. */ 343 zst->zst_r_hiwat = 0; 344 zst->zst_r_lowat = 0; 345 zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf; 346 zst->zst_rbavail = zstty_rbuf_size; 347 348 /* if there are no enable/disable functions, assume the device 349 is always enabled */ 350 if (!cs->enable) 351 cs->enabled = 1; 352 353 /* 354 * Hardware init 355 */ 356 if (ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 357 /* Call zsparam similar to open. */ 358 struct termios t; 359 360 /* Setup the "new" parameters in t. */ 361 t.c_ispeed = 0; 362 t.c_ospeed = cs->cs_defspeed; 363 t.c_cflag = cs->cs_defcflag; 364 365 s = splzs(); 366 367 /* 368 * Turn on receiver and status interrupts. 369 * We defer the actual write of the register to zsparam(), 370 * but we must make sure status interrupts are turned on by 371 * the time zsparam() reads the initial rr0 state. 372 */ 373 SET(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE); 374 375 splx(s); 376 377 /* Make sure zsparam will see changes. */ 378 tp->t_ospeed = 0; 379 (void) zsparam(tp, &t); 380 381 s = splzs(); 382 383 /* Make sure DTR is on now. */ 384 zs_modem(zst, 1); 385 386 splx(s); 387 } else { 388 /* Not the console; may need reset. */ 389 int reset; 390 391 reset = (channel == 0) ? ZSWR9_A_RESET : ZSWR9_B_RESET; 392 393 s = splzs(); 394 395 zs_write_reg(cs, 9, reset); 396 397 /* Will raise DTR in open. */ 398 zs_modem(zst, 0); 399 400 splx(s); 401 } 402} 403 404 405/* 406 * Return pointer to our tty. 407 */ 408struct tty * 409zstty(dev) 410 dev_t dev; 411{ 412 struct zstty_softc *zst; 413 int unit = ZSUNIT(dev); 414 415#ifdef DIAGNOSTIC 416 if (unit >= zstty_cd.cd_ndevs) 417 panic("zstty"); 418#endif 419 zst = zstty_cd.cd_devs[unit]; 420 return (zst->zst_tty); 421} 422 423 424void 425zs_shutdown(zst) 426 struct zstty_softc *zst; 427{ 428 struct zs_chanstate *cs = zst->zst_cs; 429 struct tty *tp = zst->zst_tty; 430 int s; 431 432 s = splzs(); 433 434 /* If we were asserting flow control, then deassert it. */ 435 SET(zst->zst_rx_flags, RX_IBUF_BLOCKED); 436 zs_hwiflow(zst); 437 438 /* Clear any break condition set with TIOCSBRK. */ 439 zs_break(cs, 0); 440 441 /* Turn off PPS capture on last close. */ 442 zst->zst_ppsmask = 0; 443 zst->ppsparam.mode = 0; 444 445 /* 446 * Hang up if necessary. Wait a bit, so the other side has time to 447 * notice even if we immediately open the port again. 448 */ 449 if (ISSET(tp->t_cflag, HUPCL)) { 450 zs_modem(zst, 0); 451 (void) tsleep(cs, TTIPRI, ttclos, hz); 452 } 453 454 /* Turn off interrupts if not the console. */ 455 if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 456 CLR(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE); 457 cs->cs_creg[1] = cs->cs_preg[1]; 458 zs_write_reg(cs, 1, cs->cs_creg[1]); 459 } 460 461 /* Call the power management hook. */ 462 if (cs->disable) { 463#ifdef DIAGNOSTIC 464 if (!cs->enabled) 465 panic("zs_shutdown: not enabled?"); 466#endif 467 (*cs->disable)(zst->zst_cs); 468 } 469 470 splx(s); 471} 472 473/* 474 * Open a zs serial (tty) port. 475 */ 476int 477zsopen(dev, flags, mode, p) 478 dev_t dev; 479 int flags; 480 int mode; 481 struct proc *p; 482{ 483 int unit = ZSUNIT(dev); 484 struct zstty_softc *zst; 485 struct zs_chanstate *cs; 486 struct tty *tp; 487 int s, s2; 488 int error; 489 490 if (unit >= zstty_cd.cd_ndevs) 491 return (ENXIO); 492 zst = zstty_cd.cd_devs[unit]; 493 if (zst == 0) 494 return (ENXIO); 495 tp = zst->zst_tty; 496 cs = zst->zst_cs; 497 498 /* If KGDB took the line, then tp==NULL */ 499 if (tp == NULL) 500 return (EBUSY); 501 502 if (ISSET(tp->t_state, TS_ISOPEN) && 503 ISSET(tp->t_state, TS_XCLUDE) && 504 p->p_ucred->cr_uid != 0) 505 return (EBUSY); 506 507 s = spltty(); 508 509 /* 510 * Do the following iff this is a first open. 511 */ 512 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 513 struct termios t; 514 515 tp->t_dev = dev; 516 517 /* Call the power management hook. */ 518 if (cs->enable) { 519 if ((*cs->enable)(cs)) { 520 splx(s2); 521 splx(s); 522 printf("%s: device enable failed\n", 523 zst->zst_dev.dv_xname); 524 return (EIO); 525 } 526 } 527 528 /* 529 * Initialize the termios status to the defaults. Add in the 530 * sticky bits from TIOCSFLAGS. 531 */ 532 t.c_ispeed = 0; 533 t.c_ospeed = cs->cs_defspeed; 534 t.c_cflag = cs->cs_defcflag; 535 if (ISSET(zst->zst_swflags, TIOCFLAG_CLOCAL)) 536 SET(t.c_cflag, CLOCAL); 537 if (ISSET(zst->zst_swflags, TIOCFLAG_CRTSCTS)) 538 SET(t.c_cflag, CRTSCTS); 539 if (ISSET(zst->zst_swflags, TIOCFLAG_CDTRCTS)) 540 SET(t.c_cflag, CDTRCTS); 541 if (ISSET(zst->zst_swflags, TIOCFLAG_MDMBUF)) 542 SET(t.c_cflag, MDMBUF); 543 544 s2 = splzs(); 545 546 /* 547 * Turn on receiver and status interrupts. 548 * We defer the actual write of the register to zsparam(), 549 * but we must make sure status interrupts are turned on by 550 * the time zsparam() reads the initial rr0 state. 551 */ 552 SET(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE); 553 554 /* Clear PPS capture state on first open. */ 555 zst->zst_ppsmask = 0; 556 zst->ppsparam.mode = 0; 557 558 splx(s2); 559 560 /* Make sure zsparam will see changes. */ 561 tp->t_ospeed = 0; 562 (void) zsparam(tp, &t); 563 564 /* 565 * Note: zsparam has done: cflag, ispeed, ospeed 566 * so we just need to do: iflag, oflag, lflag, cc 567 * For "raw" mode, just leave all zeros. 568 */ 569 if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_RAW)) { 570 tp->t_iflag = TTYDEF_IFLAG; 571 tp->t_oflag = TTYDEF_OFLAG; 572 tp->t_lflag = TTYDEF_LFLAG; 573 } else { 574 tp->t_iflag = 0; 575 tp->t_oflag = 0; 576 tp->t_lflag = 0; 577 } 578 ttychars(tp); 579 ttsetwater(tp); 580 581 s2 = splzs(); 582 583 /* 584 * Turn on DTR. We must always do this, even if carrier is not 585 * present, because otherwise we'd have to use TIOCSDTR 586 * immediately after setting CLOCAL, which applications do not 587 * expect. We always assert DTR while the device is open 588 * unless explicitly requested to deassert it. 589 */ 590 zs_modem(zst, 1); 591 592 /* Clear the input ring, and unblock. */ 593 zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf; 594 zst->zst_rbavail = zstty_rbuf_size; 595 zs_iflush(cs); 596 CLR(zst->zst_rx_flags, RX_ANY_BLOCK); 597 zs_hwiflow(zst); 598 599 splx(s2); 600 } 601 602 splx(s); 603 604 error = ttyopen(tp, ZSDIALOUT(dev), ISSET(flags, O_NONBLOCK)); 605 if (error) 606 goto bad; 607 608 error = (*linesw[tp->t_line].l_open)(dev, tp); 609 if (error) 610 goto bad; 611 612 return (0); 613 614bad: 615 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 616 /* 617 * We failed to open the device, and nobody else had it opened. 618 * Clean up the state as appropriate. 619 */ 620 zs_shutdown(zst); 621 } 622 623 return (error); 624} 625 626/* 627 * Close a zs serial port. 628 */ 629int 630zsclose(dev, flags, mode, p) 631 dev_t dev; 632 int flags; 633 int mode; 634 struct proc *p; 635{ 636 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(dev)]; 637 struct tty *tp = zst->zst_tty; 638 639 /* XXX This is for cons.c. */ 640 if (!ISSET(tp->t_state, TS_ISOPEN)) 641 return 0; 642 643 (*linesw[tp->t_line].l_close)(tp, flags); 644 ttyclose(tp); 645 646 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 647 /* 648 * Although we got a last close, the device may still be in 649 * use; e.g. if this was the dialout node, and there are still 650 * processes waiting for carrier on the non-dialout node. 651 */ 652 zs_shutdown(zst); 653 } 654 655 return (0); 656} 657 658/* 659 * Read/write zs serial port. 660 */ 661int 662zsread(dev, uio, flags) 663 dev_t dev; 664 struct uio *uio; 665 int flags; 666{ 667 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(dev)]; 668 struct tty *tp = zst->zst_tty; 669 670 return ((*linesw[tp->t_line].l_read)(tp, uio, flags)); 671} 672 673int 674zswrite(dev, uio, flags) 675 dev_t dev; 676 struct uio *uio; 677 int flags; 678{ 679 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(dev)]; 680 struct tty *tp = zst->zst_tty; 681 682 return ((*linesw[tp->t_line].l_write)(tp, uio, flags)); 683} 684 685int 686zsioctl(dev, cmd, data, flag, p) 687 dev_t dev; 688 u_long cmd; 689 caddr_t data; 690 int flag; 691 struct proc *p; 692{ 693 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(dev)]; 694 struct zs_chanstate *cs = zst->zst_cs; 695 struct tty *tp = zst->zst_tty; 696 int error; 697 int s; 698 699 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); 700 if (error >= 0) 701 return (error); 702 703 error = ttioctl(tp, cmd, data, flag, p); 704 if (error >= 0) 705 return (error); 706 707#ifdef ZS_MD_IOCTL 708 error = ZS_MD_IOCTL; 709 if (error >= 0) 710 return (error); 711#endif /* ZS_MD_IOCTL */ 712 713 error = 0; 714 715 s = splzs(); 716 717 switch (cmd) { 718 case TIOCSBRK: 719 zs_break(cs, 1); 720 break; 721 722 case TIOCCBRK: 723 zs_break(cs, 0); 724 break; 725 726 case TIOCGFLAGS: 727 *(int *)data = zst->zst_swflags; 728 break; 729 730 case TIOCSFLAGS: 731 error = suser(p->p_ucred, &p->p_acflag); 732 if (error) 733 break; 734 zst->zst_swflags = *(int *)data; 735 break; 736 737 case TIOCSDTR: 738 zs_modem(zst, 1); 739 break; 740 741 case TIOCCDTR: 742 zs_modem(zst, 0); 743 break; 744 745 case TIOCMSET: 746 case TIOCMBIS: 747 case TIOCMBIC: 748 tiocm_to_zs(zst, cmd, *(int *)data); 749 break; 750 751 case TIOCMGET: 752 *(int *)data = zs_to_tiocm(zst); 753 break; 754 755 case PPS_IOC_CREATE: 756 break; 757 758 case PPS_IOC_DESTROY: 759 break; 760 761 case PPS_IOC_GETPARAMS: { 762 pps_params_t *pp; 763 pp = (pps_params_t *)data; 764 *pp = zst->ppsparam; 765 break; 766 } 767 768 case PPS_IOC_SETPARAMS: { 769 pps_params_t *pp; 770 int mode; 771 if (cs->cs_rr0_pps == 0) { 772 error = EINVAL; 773 break; 774 } 775 pp = (pps_params_t *)data; 776 if (pp->mode & ~zsppscap) { 777 error = EINVAL; 778 break; 779 } 780 zst->ppsparam = *pp; 781 /* 782 * compute masks from user-specified timestamp state. 783 */ 784 mode = zst->ppsparam.mode; 785#ifdef PPS_SYNC 786 if (mode & PPS_HARDPPSONASSERT) { 787 mode |= PPS_CAPTUREASSERT; 788 /* XXX revoke any previous HARDPPS source */ 789 } 790 if (mode & PPS_HARDPPSONCLEAR) { 791 mode |= PPS_CAPTURECLEAR; 792 /* XXX revoke any previous HARDPPS source */ 793 } 794#endif /* PPS_SYNC */ 795 switch (mode & PPS_CAPTUREBOTH) { 796 case 0: 797 zst->zst_ppsmask = 0; 798 break; 799 800 case PPS_CAPTUREASSERT: 801 zst->zst_ppsmask = ZSRR0_DCD; 802 zst->zst_ppsassert = ZSRR0_DCD; 803 zst->zst_ppsclear = -1; 804 break; 805 806 case PPS_CAPTURECLEAR: 807 zst->zst_ppsmask = ZSRR0_DCD; 808 zst->zst_ppsassert = -1; 809 zst->zst_ppsclear = 0; 810 break; 811 812 case PPS_CAPTUREBOTH: 813 zst->zst_ppsmask = ZSRR0_DCD; 814 zst->zst_ppsassert = ZSRR0_DCD; 815 zst->zst_ppsclear = 0; 816 break; 817 818 default: 819 error = EINVAL; 820 break; 821 } 822 823 /* 824 * Now update interrupts. 825 */ 826 zs_maskintr(zst); 827 /* 828 * If nothing is being transmitted, set up new current values, 829 * else mark them as pending. 830 */ 831 if (!cs->cs_heldchange) { 832 if (zst->zst_tx_busy) { 833 zst->zst_heldtbc = zst->zst_tbc; 834 zst->zst_tbc = 0; 835 cs->cs_heldchange = 1; 836 } else 837 zs_loadchannelregs(cs); 838 } 839 840 break; 841 } 842 843 case PPS_IOC_GETCAP: 844 *(int *)data = zsppscap; 845 break; 846 847 case PPS_IOC_FETCH: { 848 pps_info_t *pi; 849 pi = (pps_info_t *)data; 850 *pi = zst->ppsinfo; 851 break; 852 } 853 854 case TIOCDCDTIMESTAMP: /* XXX old, overloaded API used by xntpd v3 */ 855 if (cs->cs_rr0_pps == 0) { 856 error = EINVAL; 857 break; 858 } 859 /* 860 * Some GPS clocks models use the falling rather than 861 * rising edge as the on-the-second signal. 862 * The old API has no way to specify PPS polarity. 863 */ 864 zst->zst_ppsmask = ZSRR0_DCD; 865#ifndef PPS_TRAILING_EDGE 866 zst->zst_ppsassert = ZSRR0_DCD; 867 zst->zst_ppsclear = -1; 868 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 869 &zst->ppsinfo.assert_timestamp); 870#else 871 zst->zst_ppsassert = -1; 872 zst->zst_ppsclear = 01; 873 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 874 &zst->ppsinfo.clear_timestamp); 875#endif 876 /* 877 * Now update interrupts. 878 */ 879 zs_maskintr(zst); 880 /* 881 * If nothing is being transmitted, set up new current values, 882 * else mark them as pending. 883 */ 884 if (!cs->cs_heldchange) { 885 if (zst->zst_tx_busy) { 886 zst->zst_heldtbc = zst->zst_tbc; 887 zst->zst_tbc = 0; 888 cs->cs_heldchange = 1; 889 } else 890 zs_loadchannelregs(cs); 891 } 892 893 break; 894 895 default: 896 error = ENOTTY; 897 break; 898 } 899 900 splx(s); 901 902 return (error); 903} 904 905/* 906 * Start or restart transmission. 907 */ 908static void 909zsstart(tp) 910 struct tty *tp; 911{ 912 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(tp->t_dev)]; 913 struct zs_chanstate *cs = zst->zst_cs; 914 int s; 915 916 s = spltty(); 917 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 918 goto out; 919 if (zst->zst_tx_stopped) 920 goto out; 921 922 if (tp->t_outq.c_cc <= tp->t_lowat) { 923 if (ISSET(tp->t_state, TS_ASLEEP)) { 924 CLR(tp->t_state, TS_ASLEEP); 925 wakeup((caddr_t)&tp->t_outq); 926 } 927 selwakeup(&tp->t_wsel); 928 if (tp->t_outq.c_cc == 0) 929 goto out; 930 } 931 932 /* Grab the first contiguous region of buffer space. */ 933 { 934 u_char *tba; 935 int tbc; 936 937 tba = tp->t_outq.c_cf; 938 tbc = ndqb(&tp->t_outq, 0); 939 940 (void) splzs(); 941 942 zst->zst_tba = tba; 943 zst->zst_tbc = tbc; 944 } 945 946 SET(tp->t_state, TS_BUSY); 947 zst->zst_tx_busy = 1; 948 949 /* Enable transmit completion interrupts if necessary. */ 950 if (!ISSET(cs->cs_preg[1], ZSWR1_TIE)) { 951 SET(cs->cs_preg[1], ZSWR1_TIE); 952 cs->cs_creg[1] = cs->cs_preg[1]; 953 zs_write_reg(cs, 1, cs->cs_creg[1]); 954 } 955 956 /* Output the first character of the contiguous buffer. */ 957 { 958 zs_write_data(cs, *zst->zst_tba); 959 zst->zst_tbc--; 960 zst->zst_tba++; 961 } 962out: 963 splx(s); 964 return; 965} 966 967/* 968 * Stop output, e.g., for ^S or output flush. 969 */ 970void 971zsstop(tp, flag) 972 struct tty *tp; 973 int flag; 974{ 975 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(tp->t_dev)]; 976 int s; 977 978 s = splzs(); 979 if (ISSET(tp->t_state, TS_BUSY)) { 980 /* Stop transmitting at the next chunk. */ 981 zst->zst_tbc = 0; 982 zst->zst_heldtbc = 0; 983 if (!ISSET(tp->t_state, TS_TTSTOP)) 984 SET(tp->t_state, TS_FLUSH); 985 } 986 splx(s); 987} 988 989/* 990 * Set ZS tty parameters from termios. 991 * XXX - Should just copy the whole termios after 992 * making sure all the changes could be done. 993 */ 994static int 995zsparam(tp, t) 996 struct tty *tp; 997 struct termios *t; 998{ 999 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(tp->t_dev)]; 1000 struct zs_chanstate *cs = zst->zst_cs; 1001 int ospeed, cflag; 1002 u_char tmp3, tmp4, tmp5; 1003 int s, error; 1004 1005 ospeed = t->c_ospeed; 1006 cflag = t->c_cflag; 1007 1008 /* Check requested parameters. */ 1009 if (ospeed < 0) 1010 return (EINVAL); 1011 if (t->c_ispeed && t->c_ispeed != ospeed) 1012 return (EINVAL); 1013 1014 /* 1015 * For the console, always force CLOCAL and !HUPCL, so that the port 1016 * is always active. 1017 */ 1018 if (ISSET(zst->zst_swflags, TIOCFLAG_SOFTCAR) || 1019 ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 1020 SET(cflag, CLOCAL); 1021 CLR(cflag, HUPCL); 1022 } 1023 1024 /* 1025 * Only whack the UART when params change. 1026 * Some callers need to clear tp->t_ospeed 1027 * to make sure initialization gets done. 1028 */ 1029 if (tp->t_ospeed == ospeed && 1030 tp->t_cflag == cflag) 1031 return (0); 1032 1033 /* 1034 * Call MD functions to deal with changed 1035 * clock modes or H/W flow control modes. 1036 * The BRG divisor is set now. (reg 12,13) 1037 */ 1038 error = zs_set_speed(cs, ospeed); 1039 if (error) 1040 return (error); 1041 error = zs_set_modes(cs, cflag); 1042 if (error) 1043 return (error); 1044 1045 /* 1046 * Block interrupts so that state will not 1047 * be altered until we are done setting it up. 1048 * 1049 * Initial values in cs_preg are set before 1050 * our attach routine is called. The master 1051 * interrupt enable is handled by zsc.c 1052 * 1053 */ 1054 s = splzs(); 1055 1056 /* 1057 * Recalculate which status ints to enable. 1058 */ 1059 zs_maskintr(zst); 1060 1061 /* Recompute character size bits. */ 1062 tmp3 = cs->cs_preg[3]; 1063 tmp5 = cs->cs_preg[5]; 1064 CLR(tmp3, ZSWR3_RXSIZE); 1065 CLR(tmp5, ZSWR5_TXSIZE); 1066 switch (ISSET(cflag, CSIZE)) { 1067 case CS5: 1068 SET(tmp3, ZSWR3_RX_5); 1069 SET(tmp5, ZSWR5_TX_5); 1070 break; 1071 case CS6: 1072 SET(tmp3, ZSWR3_RX_6); 1073 SET(tmp5, ZSWR5_TX_6); 1074 break; 1075 case CS7: 1076 SET(tmp3, ZSWR3_RX_7); 1077 SET(tmp5, ZSWR5_TX_7); 1078 break; 1079 case CS8: 1080 SET(tmp3, ZSWR3_RX_8); 1081 SET(tmp5, ZSWR5_TX_8); 1082 break; 1083 } 1084 cs->cs_preg[3] = tmp3; 1085 cs->cs_preg[5] = tmp5; 1086 1087 /* 1088 * Recompute the stop bits and parity bits. Note that 1089 * zs_set_speed() may have set clock selection bits etc. 1090 * in wr4, so those must preserved. 1091 */ 1092 tmp4 = cs->cs_preg[4]; 1093 CLR(tmp4, ZSWR4_SBMASK | ZSWR4_PARMASK); 1094 if (ISSET(cflag, CSTOPB)) 1095 SET(tmp4, ZSWR4_TWOSB); 1096 else 1097 SET(tmp4, ZSWR4_ONESB); 1098 if (!ISSET(cflag, PARODD)) 1099 SET(tmp4, ZSWR4_EVENP); 1100 if (ISSET(cflag, PARENB)) 1101 SET(tmp4, ZSWR4_PARENB); 1102 cs->cs_preg[4] = tmp4; 1103 1104 /* And copy to tty. */ 1105 tp->t_ispeed = 0; 1106 tp->t_ospeed = ospeed; 1107 tp->t_cflag = cflag; 1108 1109 /* 1110 * If nothing is being transmitted, set up new current values, 1111 * else mark them as pending. 1112 */ 1113 if (!cs->cs_heldchange) { 1114 if (zst->zst_tx_busy) { 1115 zst->zst_heldtbc = zst->zst_tbc; 1116 zst->zst_tbc = 0; 1117 cs->cs_heldchange = 1; 1118 } else 1119 zs_loadchannelregs(cs); 1120 } 1121 1122 /* 1123 * If hardware flow control is disabled, turn off the buffer water 1124 * marks and unblock any soft flow control state. Otherwise, enable 1125 * the water marks. 1126 */ 1127 if (!ISSET(cflag, CHWFLOW)) { 1128 zst->zst_r_hiwat = 0; 1129 zst->zst_r_lowat = 0; 1130 if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1131 CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1132 zst->zst_rx_ready = 1; 1133 cs->cs_softreq = 1; 1134 } 1135 if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 1136 CLR(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 1137 zs_hwiflow(zst); 1138 } 1139 } else { 1140 zst->zst_r_hiwat = zstty_rbuf_hiwat; 1141 zst->zst_r_lowat = zstty_rbuf_lowat; 1142 } 1143 1144 /* 1145 * Force a recheck of the hardware carrier and flow control status, 1146 * since we may have changed which bits we're looking at. 1147 */ 1148 zstty_stint(cs, 1); 1149 1150 splx(s); 1151 1152 /* 1153 * If hardware flow control is disabled, unblock any hard flow control 1154 * state. 1155 */ 1156 if (!ISSET(cflag, CHWFLOW)) { 1157 if (zst->zst_tx_stopped) { 1158 zst->zst_tx_stopped = 0; 1159 zsstart(tp); 1160 } 1161 } 1162 1163 zstty_softint(cs); 1164 1165 return (0); 1166} 1167 1168/* 1169 * Compute interupt enable bits and set in the pending bits. Called both 1170 * in zsparam() and when PPS (pulse per second timing) state changes. 1171 * Must be called at splzs(). 1172 */ 1173static void 1174zs_maskintr(zst) 1175 struct zstty_softc *zst; 1176{ 1177 struct zs_chanstate *cs = zst->zst_cs; 1178 int tmp15; 1179 1180 cs->cs_rr0_mask = cs->cs_rr0_cts | cs->cs_rr0_dcd; 1181 if (zst->zst_ppsmask != 0) 1182 cs->cs_rr0_mask |= cs->cs_rr0_pps; 1183 tmp15 = cs->cs_preg[15]; 1184 if (ISSET(cs->cs_rr0_mask, ZSRR0_DCD)) 1185 SET(tmp15, ZSWR15_DCD_IE); 1186 else 1187 CLR(tmp15, ZSWR15_DCD_IE); 1188 if (ISSET(cs->cs_rr0_mask, ZSRR0_CTS)) 1189 SET(tmp15, ZSWR15_CTS_IE); 1190 else 1191 CLR(tmp15, ZSWR15_CTS_IE); 1192 cs->cs_preg[15] = tmp15; 1193} 1194 1195 1196/* 1197 * Raise or lower modem control (DTR/RTS) signals. If a character is 1198 * in transmission, the change is deferred. 1199 */ 1200static void 1201zs_modem(zst, onoff) 1202 struct zstty_softc *zst; 1203 int onoff; 1204{ 1205 struct zs_chanstate *cs = zst->zst_cs; 1206 1207 if (cs->cs_wr5_dtr == 0) 1208 return; 1209 1210 if (onoff) 1211 SET(cs->cs_preg[5], cs->cs_wr5_dtr); 1212 else 1213 CLR(cs->cs_preg[5], cs->cs_wr5_dtr); 1214 1215 if (!cs->cs_heldchange) { 1216 if (zst->zst_tx_busy) { 1217 zst->zst_heldtbc = zst->zst_tbc; 1218 zst->zst_tbc = 0; 1219 cs->cs_heldchange = 1; 1220 } else 1221 zs_loadchannelregs(cs); 1222 } 1223} 1224 1225static void 1226tiocm_to_zs(zst, how, ttybits) 1227 struct zstty_softc *zst; 1228 int how, ttybits; 1229{ 1230 struct zs_chanstate *cs = zst->zst_cs; 1231 u_char zsbits; 1232 1233 zsbits = 0; 1234 if (ISSET(ttybits, TIOCM_DTR)) 1235 SET(zsbits, ZSWR5_DTR); 1236 if (ISSET(ttybits, TIOCM_RTS)) 1237 SET(zsbits, ZSWR5_RTS); 1238 1239 switch (how) { 1240 case TIOCMBIC: 1241 CLR(cs->cs_preg[5], zsbits); 1242 break; 1243 1244 case TIOCMBIS: 1245 SET(cs->cs_preg[5], zsbits); 1246 break; 1247 1248 case TIOCMSET: 1249 CLR(cs->cs_preg[5], ZSWR5_RTS | ZSWR5_DTR); 1250 SET(cs->cs_preg[5], zsbits); 1251 break; 1252 } 1253 1254 if (!cs->cs_heldchange) { 1255 if (zst->zst_tx_busy) { 1256 zst->zst_heldtbc = zst->zst_tbc; 1257 zst->zst_tbc = 0; 1258 cs->cs_heldchange = 1; 1259 } else 1260 zs_loadchannelregs(cs); 1261 } 1262} 1263 1264static int 1265zs_to_tiocm(zst) 1266 struct zstty_softc *zst; 1267{ 1268 struct zs_chanstate *cs = zst->zst_cs; 1269 u_char zsbits; 1270 int ttybits = 0; 1271 1272 zsbits = cs->cs_preg[5]; 1273 if (ISSET(zsbits, ZSWR5_DTR)) 1274 SET(ttybits, TIOCM_DTR); 1275 if (ISSET(zsbits, ZSWR5_RTS)) 1276 SET(ttybits, TIOCM_RTS); 1277 1278 zsbits = cs->cs_rr0; 1279 if (ISSET(zsbits, ZSRR0_DCD)) 1280 SET(ttybits, TIOCM_CD); 1281 if (ISSET(zsbits, ZSRR0_CTS)) 1282 SET(ttybits, TIOCM_CTS); 1283 1284 return (ttybits); 1285} 1286 1287/* 1288 * Try to block or unblock input using hardware flow-control. 1289 * This is called by kern/tty.c if MDMBUF|CRTSCTS is set, and 1290 * if this function returns non-zero, the TS_TBLOCK flag will 1291 * be set or cleared according to the "block" arg passed. 1292 */ 1293int 1294zshwiflow(tp, block) 1295 struct tty *tp; 1296 int block; 1297{ 1298 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(tp->t_dev)]; 1299 struct zs_chanstate *cs = zst->zst_cs; 1300 int s; 1301 1302 if (cs->cs_wr5_rts == 0) 1303 return (0); 1304 1305 s = splzs(); 1306 if (block) { 1307 if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1308 SET(zst->zst_rx_flags, RX_TTY_BLOCKED); 1309 zs_hwiflow(zst); 1310 } 1311 } else { 1312 if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1313 CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1314 zst->zst_rx_ready = 1; 1315 cs->cs_softreq = 1; 1316 } 1317 if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1318 CLR(zst->zst_rx_flags, RX_TTY_BLOCKED); 1319 zs_hwiflow(zst); 1320 } 1321 } 1322 splx(s); 1323 return (1); 1324} 1325 1326/* 1327 * Internal version of zshwiflow 1328 * called at splzs 1329 */ 1330static void 1331zs_hwiflow(zst) 1332 struct zstty_softc *zst; 1333{ 1334 struct zs_chanstate *cs = zst->zst_cs; 1335 1336 if (cs->cs_wr5_rts == 0) 1337 return; 1338 1339 if (ISSET(zst->zst_rx_flags, RX_ANY_BLOCK)) { 1340 CLR(cs->cs_preg[5], cs->cs_wr5_rts); 1341 CLR(cs->cs_creg[5], cs->cs_wr5_rts); 1342 } else { 1343 SET(cs->cs_preg[5], cs->cs_wr5_rts); 1344 SET(cs->cs_creg[5], cs->cs_wr5_rts); 1345 } 1346 zs_write_reg(cs, 5, cs->cs_creg[5]); 1347} 1348 1349 1350/**************************************************************** 1351 * Interface to the lower layer (zscc) 1352 ****************************************************************/ 1353 1354#define integrate static inline 1355integrate void zstty_rxsoft __P((struct zstty_softc *, struct tty *)); 1356integrate void zstty_txsoft __P((struct zstty_softc *, struct tty *)); 1357integrate void zstty_stsoft __P((struct zstty_softc *, struct tty *)); 1358static void zstty_diag __P((void *)); 1359 1360/* 1361 * receiver ready interrupt. 1362 * called at splzs 1363 */ 1364static void 1365zstty_rxint(cs) 1366 struct zs_chanstate *cs; 1367{ 1368 struct zstty_softc *zst = cs->cs_private; 1369 u_char *put, *end; 1370 u_int cc; 1371 u_char rr0, rr1, c; 1372 1373 end = zst->zst_ebuf; 1374 put = zst->zst_rbput; 1375 cc = zst->zst_rbavail; 1376 1377 while (cc > 0) { 1378 /* 1379 * First read the status, because reading the received char 1380 * destroys the status of this char. 1381 */ 1382 rr1 = zs_read_reg(cs, 1); 1383 c = zs_read_data(cs); 1384 1385 if (ISSET(rr1, ZSRR1_FE | ZSRR1_DO | ZSRR1_PE)) { 1386 /* Clear the receive error. */ 1387 zs_write_csr(cs, ZSWR0_RESET_ERRORS); 1388 } 1389 1390 put[0] = c; 1391 put[1] = rr1; 1392 put += 2; 1393 if (put >= end) 1394 put = zst->zst_rbuf; 1395 cc--; 1396 1397 rr0 = zs_read_csr(cs); 1398 if (!ISSET(rr0, ZSRR0_RX_READY)) 1399 break; 1400 } 1401 1402 /* 1403 * Current string of incoming characters ended because 1404 * no more data was available or we ran out of space. 1405 * Schedule a receive event if any data was received. 1406 * If we're out of space, turn off receive interrupts. 1407 */ 1408 zst->zst_rbput = put; 1409 zst->zst_rbavail = cc; 1410 if (!ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1411 zst->zst_rx_ready = 1; 1412 cs->cs_softreq = 1; 1413 } 1414 1415 /* 1416 * See if we are in danger of overflowing a buffer. If 1417 * so, use hardware flow control to ease the pressure. 1418 */ 1419 if (!ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED) && 1420 cc < zst->zst_r_hiwat) { 1421 SET(zst->zst_rx_flags, RX_IBUF_BLOCKED); 1422 zs_hwiflow(zst); 1423 } 1424 1425 /* 1426 * If we're out of space, disable receive interrupts 1427 * until the queue has drained a bit. 1428 */ 1429 if (!cc) { 1430 SET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED); 1431 CLR(cs->cs_preg[1], ZSWR1_RIE); 1432 cs->cs_creg[1] = cs->cs_preg[1]; 1433 zs_write_reg(cs, 1, cs->cs_creg[1]); 1434 } 1435 1436#if 0 1437 printf("%xH%04d\n", zst->zst_rx_flags, zst->zst_rbavail); 1438#endif 1439} 1440 1441/* 1442 * transmitter ready interrupt. (splzs) 1443 */ 1444static void 1445zstty_txint(cs) 1446 struct zs_chanstate *cs; 1447{ 1448 struct zstty_softc *zst = cs->cs_private; 1449 1450 /* 1451 * If we've delayed a parameter change, do it now, and restart 1452 * output. 1453 */ 1454 if (cs->cs_heldchange) { 1455 zs_loadchannelregs(cs); 1456 cs->cs_heldchange = 0; 1457 zst->zst_tbc = zst->zst_heldtbc; 1458 zst->zst_heldtbc = 0; 1459 } 1460 1461 /* Output the next character in the buffer, if any. */ 1462 if (zst->zst_tbc > 0) { 1463 zs_write_data(cs, *zst->zst_tba); 1464 zst->zst_tbc--; 1465 zst->zst_tba++; 1466 } else { 1467 /* Disable transmit completion interrupts if necessary. */ 1468 if (ISSET(cs->cs_preg[1], ZSWR1_TIE)) { 1469 CLR(cs->cs_preg[1], ZSWR1_TIE); 1470 cs->cs_creg[1] = cs->cs_preg[1]; 1471 zs_write_reg(cs, 1, cs->cs_creg[1]); 1472 } 1473 if (zst->zst_tx_busy) { 1474 zst->zst_tx_busy = 0; 1475 zst->zst_tx_done = 1; 1476 cs->cs_softreq = 1; 1477 } 1478 } 1479} 1480 1481/* 1482 * status change interrupt. (splzs) 1483 */ 1484static void 1485zstty_stint(cs, force) 1486 struct zs_chanstate *cs; 1487 int force; 1488{ 1489 struct zstty_softc *zst = cs->cs_private; 1490 u_char rr0, delta; 1491 1492 rr0 = zs_read_csr(cs); 1493 zs_write_csr(cs, ZSWR0_RESET_STATUS); 1494 1495 /* 1496 * Check here for console break, so that we can abort 1497 * even when interrupts are locking up the machine. 1498 */ 1499 if (ISSET(rr0, ZSRR0_BREAK) && 1500 ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE_INPUT)) { 1501 zs_abort(cs); 1502 return; 1503 } 1504 1505 if (!force) 1506 delta = rr0 ^ cs->cs_rr0; 1507 else 1508 delta = cs->cs_rr0_mask; 1509 cs->cs_rr0 = rr0; 1510 1511 if (ISSET(delta, cs->cs_rr0_mask)) { 1512 SET(cs->cs_rr0_delta, delta); 1513 1514 /* 1515 * Pulse-per-second clock signal on edge of DCD? 1516 */ 1517 if (ISSET(delta, zst->zst_ppsmask)) { 1518 struct timeval tv; 1519 if (ISSET(rr0, zst->zst_ppsmask) == zst->zst_ppsassert) { 1520 /* XXX nanotime() */ 1521 microtime(&tv); 1522 TIMEVAL_TO_TIMESPEC(&tv, 1523 &zst->ppsinfo.assert_timestamp); 1524 if (zst->ppsparam.mode & PPS_OFFSETASSERT) { 1525 timespecadd(&zst->ppsinfo.assert_timestamp, 1526 &zst->ppsparam.assert_offset, 1527 &zst->ppsinfo.assert_timestamp); 1528 } 1529 1530#ifdef PPS_SYNC 1531 if (zst->ppsparam.mode & PPS_HARDPPSONASSERT) 1532 hardpps(&tv, tv.tv_usec); 1533#endif 1534 zst->ppsinfo.assert_sequence++; 1535 zst->ppsinfo.current_mode = zst->ppsparam.mode; 1536 } else if (ISSET(rr0, zst->zst_ppsmask) == 1537 zst->zst_ppsclear) { 1538 /* XXX nanotime() */ 1539 microtime(&tv); 1540 TIMEVAL_TO_TIMESPEC(&tv, 1541 &zst->ppsinfo.clear_timestamp); 1542 if (zst->ppsparam.mode & PPS_OFFSETCLEAR) { 1543 timespecadd(&zst->ppsinfo.clear_timestamp, 1544 &zst->ppsparam.clear_offset, 1545 &zst->ppsinfo.clear_timestamp); 1546 } 1547 1548#ifdef PPS_SYNC 1549 if (zst->ppsparam.mode & PPS_HARDPPSONCLEAR) 1550 hardpps(&tv, tv.tv_usec); 1551#endif 1552 zst->ppsinfo.clear_sequence++; 1553 zst->ppsinfo.current_mode = zst->ppsparam.mode; 1554 } 1555 } 1556 1557 /* 1558 * Stop output immediately if we lose the output 1559 * flow control signal or carrier detect. 1560 */ 1561 if (ISSET(~rr0, cs->cs_rr0_mask)) { 1562 zst->zst_tbc = 0; 1563 zst->zst_heldtbc = 0; 1564 } 1565 1566 zst->zst_st_check = 1; 1567 cs->cs_softreq = 1; 1568 } 1569} 1570 1571void 1572zstty_diag(arg) 1573 void *arg; 1574{ 1575 struct zstty_softc *zst = arg; 1576 int overflows, floods; 1577 int s; 1578 1579 s = splzs(); 1580 overflows = zst->zst_overflows; 1581 zst->zst_overflows = 0; 1582 floods = zst->zst_floods; 1583 zst->zst_floods = 0; 1584 zst->zst_errors = 0; 1585 splx(s); 1586 1587 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1588 zst->zst_dev.dv_xname, 1589 overflows, overflows == 1 ? "" : "s", 1590 floods, floods == 1 ? "" : "s"); 1591} 1592 1593integrate void 1594zstty_rxsoft(zst, tp) 1595 struct zstty_softc *zst; 1596 struct tty *tp; 1597{ 1598 struct zs_chanstate *cs = zst->zst_cs; 1599 int (*rint) __P((int c, struct tty *tp)) = linesw[tp->t_line].l_rint; 1600 u_char *get, *end; 1601 u_int cc, scc; 1602 u_char rr1; 1603 int code; 1604 int s; 1605 1606 end = zst->zst_ebuf; 1607 get = zst->zst_rbget; 1608 scc = cc = zstty_rbuf_size - zst->zst_rbavail; 1609 1610 if (cc == zstty_rbuf_size) { 1611 zst->zst_floods++; 1612 if (zst->zst_errors++ == 0) 1613 timeout(zstty_diag, zst, 60 * hz); 1614 } 1615 1616 /* If not yet open, drop the entire buffer content here */ 1617 if (!ISSET(tp->t_state, TS_ISOPEN)) { 1618 get += cc << 1; 1619 if (get >= end) 1620 get -= zstty_rbuf_size << 1; 1621 cc = 0; 1622 } 1623 while (cc) { 1624 code = get[0]; 1625 rr1 = get[1]; 1626 if (ISSET(rr1, ZSRR1_DO | ZSRR1_FE | ZSRR1_PE)) { 1627 if (ISSET(rr1, ZSRR1_DO)) { 1628 zst->zst_overflows++; 1629 if (zst->zst_errors++ == 0) 1630 timeout(zstty_diag, zst, 60 * hz); 1631 } 1632 if (ISSET(rr1, ZSRR1_FE)) 1633 SET(code, TTY_FE); 1634 if (ISSET(rr1, ZSRR1_PE)) 1635 SET(code, TTY_PE); 1636 } 1637 if ((*rint)(code, tp) == -1) { 1638 /* 1639 * The line discipline's buffer is out of space. 1640 */ 1641 if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1642 /* 1643 * We're either not using flow control, or the 1644 * line discipline didn't tell us to block for 1645 * some reason. Either way, we have no way to 1646 * know when there's more space available, so 1647 * just drop the rest of the data. 1648 */ 1649 get += cc << 1; 1650 if (get >= end) 1651 get -= zstty_rbuf_size << 1; 1652 cc = 0; 1653 } else { 1654 /* 1655 * Don't schedule any more receive processing 1656 * until the line discipline tells us there's 1657 * space available (through comhwiflow()). 1658 * Leave the rest of the data in the input 1659 * buffer. 1660 */ 1661 SET(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1662 } 1663 break; 1664 } 1665 get += 2; 1666 if (get >= end) 1667 get = zst->zst_rbuf; 1668 cc--; 1669 } 1670 1671 if (cc != scc) { 1672 zst->zst_rbget = get; 1673 s = splzs(); 1674 cc = zst->zst_rbavail += scc - cc; 1675 /* Buffers should be ok again, release possible block. */ 1676 if (cc >= zst->zst_r_lowat) { 1677 if (ISSET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED)) { 1678 CLR(zst->zst_rx_flags, RX_IBUF_OVERFLOWED); 1679 SET(cs->cs_preg[1], ZSWR1_RIE); 1680 cs->cs_creg[1] = cs->cs_preg[1]; 1681 zs_write_reg(cs, 1, cs->cs_creg[1]); 1682 } 1683 if (ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED)) { 1684 CLR(zst->zst_rx_flags, RX_IBUF_BLOCKED); 1685 zs_hwiflow(zst); 1686 } 1687 } 1688 splx(s); 1689 } 1690 1691#if 0 1692 printf("%xS%04d\n", zst->zst_rx_flags, zst->zst_rbavail); 1693#endif 1694} 1695 1696integrate void 1697zstty_txsoft(zst, tp) 1698 struct zstty_softc *zst; 1699 struct tty *tp; 1700{ 1701 1702 CLR(tp->t_state, TS_BUSY); 1703 if (ISSET(tp->t_state, TS_FLUSH)) 1704 CLR(tp->t_state, TS_FLUSH); 1705 else 1706 ndflush(&tp->t_outq, (int)(zst->zst_tba - tp->t_outq.c_cf)); 1707 (*linesw[tp->t_line].l_start)(tp); 1708} 1709 1710integrate void 1711zstty_stsoft(zst, tp) 1712 struct zstty_softc *zst; 1713 struct tty *tp; 1714{ 1715 struct zs_chanstate *cs = zst->zst_cs; 1716 u_char rr0, delta; 1717 int s; 1718 1719 s = splzs(); 1720 rr0 = cs->cs_rr0; 1721 delta = cs->cs_rr0_delta; 1722 cs->cs_rr0_delta = 0; 1723 splx(s); 1724 1725 if (ISSET(delta, cs->cs_rr0_dcd)) { 1726 /* 1727 * Inform the tty layer that carrier detect changed. 1728 */ 1729 (void) (*linesw[tp->t_line].l_modem)(tp, ISSET(rr0, ZSRR0_DCD)); 1730 } 1731 1732 if (ISSET(delta, cs->cs_rr0_cts)) { 1733 /* Block or unblock output according to flow control. */ 1734 if (ISSET(rr0, cs->cs_rr0_cts)) { 1735 zst->zst_tx_stopped = 0; 1736 (*linesw[tp->t_line].l_start)(tp); 1737 } else { 1738 zst->zst_tx_stopped = 1; 1739 } 1740 } 1741} 1742 1743/* 1744 * Software interrupt. Called at zssoft 1745 * 1746 * The main job to be done here is to empty the input ring 1747 * by passing its contents up to the tty layer. The ring is 1748 * always emptied during this operation, therefore the ring 1749 * must not be larger than the space after "high water" in 1750 * the tty layer, or the tty layer might drop our input. 1751 * 1752 * Note: an "input blockage" condition is assumed to exist if 1753 * EITHER the TS_TBLOCK flag or zst_rx_blocked flag is set. 1754 */ 1755static void 1756zstty_softint(cs) 1757 struct zs_chanstate *cs; 1758{ 1759 struct zstty_softc *zst = cs->cs_private; 1760 struct tty *tp = zst->zst_tty; 1761 int s; 1762 1763 s = spltty(); 1764 1765 if (zst->zst_rx_ready) { 1766 zst->zst_rx_ready = 0; 1767 zstty_rxsoft(zst, tp); 1768 } 1769 1770 if (zst->zst_st_check) { 1771 zst->zst_st_check = 0; 1772 zstty_stsoft(zst, tp); 1773 } 1774 1775 if (zst->zst_tx_done) { 1776 zst->zst_tx_done = 0; 1777 zstty_txsoft(zst, tp); 1778 } 1779 1780 splx(s); 1781} 1782 1783struct zsops zsops_tty = { 1784 zstty_rxint, /* receive char available */ 1785 zstty_stint, /* external/status */ 1786 zstty_txint, /* xmit buffer empty */ 1787 zstty_softint, /* process software interrupt */ 1788}; 1789