1/* $OpenBSD: z8530tty.c,v 1.32 2020/01/09 14:35:19 mpi Exp $ */ 2/* $NetBSD: z8530tty.c,v 1.77 2001/05/30 15:24:24 lukem Exp $ */ 3 4/*- 5 * Copyright (c) 1993, 1994, 1995, 1996, 1997, 1998, 1999 6 * Charles M. Hannum. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by Charles M. Hannum. 19 * 4. The name of the author may not be used to endorse or promote products 20 * derived from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34/* 35 * Copyright (c) 1994 Gordon W. Ross 36 * Copyright (c) 1992, 1993 37 * The Regents of the University of California. All rights reserved. 38 * 39 * This software was developed by the Computer Systems Engineering group 40 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 41 * contributed to Berkeley. 42 * 43 * All advertising materials mentioning features or use of this software 44 * must display the following acknowledgement: 45 * This product includes software developed by the University of 46 * California, Lawrence Berkeley Laboratory. 47 * 48 * Redistribution and use in source and binary forms, with or without 49 * modification, are permitted provided that the following conditions 50 * are met: 51 * 1. Redistributions of source code must retain the above copyright 52 * notice, this list of conditions and the following disclaimer. 53 * 2. Redistributions in binary form must reproduce the above copyright 54 * notice, this list of conditions and the following disclaimer in the 55 * documentation and/or other materials provided with the distribution. 56 * 3. Neither the name of the University nor the names of its contributors 57 * may be used to endorse or promote products derived from this software 58 * without specific prior written permission. 59 * 60 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 61 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 62 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 63 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 64 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 65 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 66 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 67 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 68 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 69 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 70 * SUCH DAMAGE. 71 * 72 * @(#)zs.c 8.1 (Berkeley) 7/19/93 73 */ 74 75/* 76 * Zilog Z8530 Dual UART driver (tty interface) 77 * 78 * This is the "slave" driver that will be attached to 79 * the "zsc" driver for plain "tty" async. serial lines. 80 * 81 * Credits, history: 82 * 83 * The original version of this code was the sparc/dev/zs.c driver 84 * as distributed with the Berkeley 4.4 Lite release. Since then, 85 * Gordon Ross reorganized the code into the current parent/child 86 * driver scheme, separating the Sun keyboard and mouse support 87 * into independent child drivers. 88 * 89 * RTS/CTS flow-control support was a collaboration of: 90 * Gordon Ross <gwr@NetBSD.org>, 91 * Bill Studenmund <wrstuden@loki.stanford.edu> 92 * Ian Dall <Ian.Dall@dsto.defence.gov.au> 93 * 94 * The driver was massively overhauled in November 1997 by Charles Hannum, 95 * fixing *many* bugs, and substantially improving performance. 96 */ 97 98#include <sys/param.h> 99#include <sys/systm.h> 100#include <sys/proc.h> 101#include <sys/device.h> 102#include <sys/conf.h> 103#include <sys/fcntl.h> 104#include <sys/ioctl.h> 105#include <sys/malloc.h> 106#include <sys/tty.h> 107#include <sys/time.h> 108#include <sys/kernel.h> 109#include <sys/syslog.h> 110 111#include <dev/ic/z8530reg.h> 112#include <machine/z8530var.h> 113 114#include <dev/cons.h> 115 116/* 117 * Allow the MD var.h to override the default CFLAG so that 118 * console messages during boot come out with correct parity. 119 */ 120#ifndef ZSTTY_DEF_CFLAG 121#define ZSTTY_DEF_CFLAG TTYDEF_CFLAG 122#endif 123 124/* 125 * How many input characters we can buffer. 126 * The port-specific var.h may override this. 127 * Note: must be a power of two! 128 */ 129#ifndef ZSTTY_RING_SIZE 130#define ZSTTY_RING_SIZE 2048 131#endif 132 133struct cfdriver zstty_cd = { 134 NULL, "zstty", DV_TTY 135}; 136 137/* 138 * Make this an option variable one can patch. 139 * But be warned: this must be a power of 2! 140 */ 141u_int zstty_rbuf_size = ZSTTY_RING_SIZE; 142 143/* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */ 144u_int zstty_rbuf_hiwat = (ZSTTY_RING_SIZE * 1) / 4; 145u_int zstty_rbuf_lowat = (ZSTTY_RING_SIZE * 3) / 4; 146 147struct zstty_softc { 148 struct device zst_dev; /* required first: base device */ 149 struct tty *zst_tty; 150 struct zs_chanstate *zst_cs; 151 152 struct timeout zst_diag_ch; 153 154 u_int zst_overflows, 155 zst_floods, 156 zst_errors; 157 158 int zst_hwflags, /* see z8530var.h */ 159 zst_swflags; /* TIOCFLAG_SOFTCAR, ... <ttycom.h> */ 160 161 u_int zst_r_hiwat, 162 zst_r_lowat; 163 uint8_t *volatile zst_rbget, 164 *volatile zst_rbput; 165 volatile u_int zst_rbavail; 166 uint8_t *zst_rbuf, 167 *zst_ebuf; 168 169 /* 170 * The transmit byte count and address are used for pseudo-DMA 171 * output in the hardware interrupt code. PDMA can be suspended 172 * to get pending changes done; heldtbc is used for this. It can 173 * also be stopped for ^S; this sets TS_TTSTOP in tp->t_state. 174 */ 175 uint8_t *zst_tba; /* transmit buffer address */ 176 u_int zst_tbc, /* transmit byte count */ 177 zst_heldtbc; /* held tbc while xmission stopped */ 178 179 /* Flags to communicate with zstty_softint() */ 180 volatile uint8_t zst_rx_flags, /* receiver blocked */ 181#define RX_TTY_BLOCKED 0x01 182#define RX_TTY_OVERFLOWED 0x02 183#define RX_IBUF_BLOCKED 0x04 184#define RX_IBUF_OVERFLOWED 0x08 185#define RX_ANY_BLOCK 0x0f 186 zst_tx_busy, /* working on an output chunk */ 187 zst_tx_done, /* done with one output chunk */ 188 zst_tx_stopped, /* H/W level stop (lost CTS) */ 189 zst_st_check, /* got a status interrupt */ 190 zst_rx_ready; 191 192 /* PPS signal on DCD, with or without inkernel clock disciplining */ 193 uint8_t zst_ppsmask; /* pps signal mask */ 194 uint8_t zst_ppsassert; /* pps leading edge */ 195 uint8_t zst_ppsclear; /* pps trailing edge */ 196}; 197 198/* Definition of the driver for autoconfig. */ 199int zstty_match(struct device *, void *, void *); 200void zstty_attach(struct device *, struct device *, void *); 201 202const struct cfattach zstty_ca = { 203 sizeof(struct zstty_softc), zstty_match, zstty_attach 204}; 205 206cdev_decl(zs); 207 208struct zsops zsops_tty; 209 210void zs_shutdown(struct zstty_softc *); 211void zsstart(struct tty *); 212int zsparam(struct tty *, struct termios *); 213void zs_modem(struct zstty_softc *, int); 214void tiocm_to_zs(struct zstty_softc *, u_long, int); 215int zs_to_tiocm(struct zstty_softc *); 216int zshwiflow(struct tty *, int); 217void zs_hwiflow(struct zstty_softc *); 218void zs_maskintr(struct zstty_softc *); 219 220struct zstty_softc *zs_device_lookup(struct cfdriver *, int); 221 222/* Low-level routines. */ 223void zstty_rxint(struct zs_chanstate *); 224void zstty_stint(struct zs_chanstate *, int); 225void zstty_txint(struct zs_chanstate *); 226void zstty_softint(struct zs_chanstate *); 227void zstty_diag(void *); 228 229#define ZSUNIT(x) (minor(x) & 0x7f) 230#define ZSDIALOUT(x) (minor(x) & 0x80) 231 232struct zstty_softc * 233zs_device_lookup(struct cfdriver *cf, int unit) 234{ 235 return (struct zstty_softc *)device_lookup(cf, unit); 236} 237 238/* 239 * zstty_match: how is this zs channel configured? 240 */ 241int 242zstty_match(struct device *parent, void *vcf, void *aux) 243{ 244 struct cfdata *cf = vcf; 245 struct zsc_attach_args *args = aux; 246 247 /* Exact match is better than wildcard. */ 248 if (cf->cf_loc[0] == args->channel) 249 return 2; 250 251 /* This driver accepts wildcard. */ 252 if (cf->cf_loc[0] == -1) 253 return 1; 254 255 return 0; 256} 257 258void 259zstty_attach(struct device *parent, struct device *self, void *aux) 260{ 261 struct zsc_softc *zsc = (struct zsc_softc *)parent; 262 struct zstty_softc *zst = (struct zstty_softc *)self; 263 struct cfdata *cf = self->dv_cfdata; 264 struct zsc_attach_args *args = aux; 265 struct zs_chanstate *cs; 266 struct tty *tp; 267 int channel, s, tty_unit; 268 dev_t dev; 269 const char *i, *o; 270 int dtr_on; 271 int resetbit; 272 273 timeout_set(&zst->zst_diag_ch, zstty_diag, zst); 274 275 tty_unit = zst->zst_dev.dv_unit; 276 channel = args->channel; 277 cs = zsc->zsc_cs[channel]; 278 cs->cs_private = zst; 279 cs->cs_ops = &zsops_tty; 280 281 zst->zst_cs = cs; 282 zst->zst_swflags = cf->cf_flags; /* softcar, etc. */ 283 zst->zst_hwflags = args->hwflags; 284 dev = makedev(zs_major, tty_unit); 285 286 if (zst->zst_swflags) 287 printf(" flags 0x%x", zst->zst_swflags); 288 289 if (ISSET(zst->zst_hwflags, ZS_HWFLAG_NO_DCD)) 290 SET(zst->zst_swflags, TIOCFLAG_SOFTCAR); 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 args->consdev->cn_dev = dev; 302 cn_tab->cn_pollc = args->consdev->cn_pollc; 303 cn_tab->cn_getc = args->consdev->cn_getc; 304 } 305 cn_tab->cn_dev = dev; 306 } 307 if ((zst->zst_hwflags & ZS_HWFLAG_CONSOLE_OUTPUT) != 0) { 308 o = " output"; 309 if ((args->hwflags & ZS_HWFLAG_USE_CONSDEV) != 0) { 310 cn_tab->cn_putc = args->consdev->cn_putc; 311 } 312 cn_tab->cn_dev = dev; 313 } 314 if (i != NULL || o != NULL) { 315 printf(": console%s", i ? (o ? "" : i) : o); 316 } 317 318#if defined(__sparc64__) 319 if (strcmp(args->type, "keyboard") == 0 || 320 strcmp(args->type, "mouse") == 0) 321 printf(": %s", args->type); 322#endif 323 324 printf("\n"); 325 326 tp = ttymalloc(0); 327 tp->t_dev = dev; 328 tp->t_oproc = zsstart; 329 tp->t_param = zsparam; 330 tp->t_hwiflow = zshwiflow; 331 332 zst->zst_tty = tp; 333 zst->zst_rbuf = mallocarray(zstty_rbuf_size, 2, M_DEVBUF, M_WAITOK); 334 zst->zst_ebuf = zst->zst_rbuf + (zstty_rbuf_size * 2); 335 /* Disable the high water mark. */ 336 zst->zst_r_hiwat = 0; 337 zst->zst_r_lowat = 0; 338 zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf; 339 zst->zst_rbavail = zstty_rbuf_size; 340 341 /* if there are no enable/disable functions, assume the device 342 is always enabled */ 343 if (!cs->enable) 344 cs->enabled = 1; 345 346 /* 347 * Hardware init 348 */ 349 dtr_on = 0; 350 resetbit = 0; 351 if (ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 352 /* Call zsparam similar to open. */ 353 struct termios t; 354 355 /* Wait a while for previous console output to complete */ 356 DELAY(10000); 357 358 /* Setup the "new" parameters in t. */ 359 t.c_ispeed = 0; 360 t.c_ospeed = cs->cs_defspeed; 361 t.c_cflag = cs->cs_defcflag; 362 363 s = splzs(); 364 365 /* 366 * Turn on receiver and status interrupts. 367 * We defer the actual write of the register to zsparam(), 368 * but we must make sure status interrupts are turned on by 369 * the time zsparam() reads the initial rr0 state. 370 */ 371 SET(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_TIE | ZSWR1_SIE); 372 373 splx(s); 374 375 /* Make sure zsparam will see changes. */ 376 tp->t_ospeed = 0; 377 (void)zsparam(tp, &t); 378 379 /* Make sure DTR is on now. */ 380 dtr_on = 1; 381 } else if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_NORESET)) { 382 /* Not the console; may need reset. */ 383 resetbit = (channel == 0) ? ZSWR9_A_RESET : ZSWR9_B_RESET; 384 } 385 386 s = splzs(); 387 if (resetbit) 388 zs_write_reg(cs, 9, resetbit); 389 zs_modem(zst, dtr_on); 390 splx(s); 391} 392 393 394/* 395 * Return pointer to our tty. 396 */ 397struct tty * 398zstty(dev_t dev) 399{ 400 struct zstty_softc *zst = zs_device_lookup(&zstty_cd, ZSUNIT(dev)); 401 402 return (zst->zst_tty); 403} 404 405 406void 407zs_shutdown(struct zstty_softc *zst) 408{ 409 struct zs_chanstate *cs = zst->zst_cs; 410 struct tty *tp = zst->zst_tty; 411 int s; 412 413 s = splzs(); 414 415 /* If we were asserting flow control, then deassert it. */ 416 SET(zst->zst_rx_flags, RX_IBUF_BLOCKED); 417 zs_hwiflow(zst); 418 419 /* Clear any break condition set with TIOCSBRK. */ 420 zs_break(cs, 0); 421 422 /* Turn off PPS capture on last close. */ 423 zst->zst_ppsmask = 0; 424 425 /* 426 * Hang up if necessary. Wait a bit, so the other side has time to 427 * notice even if we immediately open the port again. 428 */ 429 if (ISSET(tp->t_cflag, HUPCL) || ISSET(tp->t_state, TS_WOPEN)) { 430 zs_modem(zst, 0); 431 /* hold low for 1 second */ 432 tsleep_nsec(cs, TTIPRI, ttclos, SEC_TO_NSEC(1)); 433 } 434 435 /* Turn off interrupts if not the console. */ 436 if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 437 CLR(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_TIE | ZSWR1_SIE); 438 cs->cs_creg[1] = cs->cs_preg[1]; 439 zs_write_reg(cs, 1, cs->cs_creg[1]); 440 } 441 442 /* Call the power management hook. */ 443 if (cs->disable) { 444#ifdef DIAGNOSTIC 445 if (!cs->enabled) 446 panic("%s: not enabled?", __func__); 447#endif 448 (*cs->disable)(zst->zst_cs); 449 } 450 451 splx(s); 452} 453 454/* 455 * Open a zs serial (tty) port. 456 */ 457int 458zsopen(dev_t dev, int flags, int mode, struct proc *p) 459{ 460 struct zstty_softc *zst; 461 struct zs_chanstate *cs; 462 struct tty *tp; 463 int s; 464#if IPL_ZS != IPL_TTY 465 int s2; 466#endif 467 int error; 468 469 zst = zs_device_lookup(&zstty_cd, ZSUNIT(dev)); 470 if (zst == NULL) 471 return (ENXIO); 472 473 tp = zst->zst_tty; 474 cs = zst->zst_cs; 475 476 /* If KGDB took the line, then tp==NULL */ 477 if (tp == NULL) 478 return (EBUSY); 479 480 if (ISSET(tp->t_state, TS_ISOPEN) && 481 ISSET(tp->t_state, TS_XCLUDE) && 482 suser(p) != 0) 483 return (EBUSY); 484 485 s = spltty(); 486 487 /* 488 * Do the following iff this is a first open. 489 */ 490 if (!ISSET(tp->t_state, TS_ISOPEN)) { 491 struct termios t; 492 493 tp->t_dev = dev; 494 495 /* Call the power management hook. */ 496 if (cs->enable) { 497 if ((*cs->enable)(cs)) { 498 splx(s); 499 printf("%s: device enable failed\n", 500 zst->zst_dev.dv_xname); 501 return (EIO); 502 } 503 } 504 505 /* 506 * Initialize the termios status to the defaults. Add in the 507 * sticky bits from TIOCSFLAGS. 508 */ 509 t.c_ispeed = 0; 510 t.c_ospeed = cs->cs_defspeed; 511 t.c_cflag = cs->cs_defcflag; 512 if (ISSET(zst->zst_swflags, TIOCFLAG_CLOCAL)) 513 SET(t.c_cflag, CLOCAL); 514 if (ISSET(zst->zst_swflags, TIOCFLAG_CRTSCTS)) 515 SET(t.c_cflag, CRTSCTS); 516 if (ISSET(zst->zst_swflags, TIOCFLAG_MDMBUF)) 517 SET(t.c_cflag, MDMBUF); 518 519#if IPL_ZS != IPL_TTY 520 s2 = splzs(); 521#endif 522 523 /* 524 * Turn on receiver and status interrupts. 525 * We defer the actual write of the register to zsparam(), 526 * but we must make sure status interrupts are turned on by 527 * the time zsparam() reads the initial rr0 state. 528 */ 529 SET(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_TIE | ZSWR1_SIE); 530 531 /* Clear PPS capture state on first open. */ 532 zst->zst_ppsmask = 0; 533 534#if IPL_ZS != IPL_TTY 535 splx(s2); 536#endif 537 538 /* Make sure zsparam will see changes. */ 539 tp->t_ospeed = 0; 540 (void)zsparam(tp, &t); 541 542 /* 543 * Note: zsparam has done: cflag, ispeed, ospeed 544 * so we just need to do: iflag, oflag, lflag, cc 545 * For "raw" mode, just leave all zeros. 546 */ 547 if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_RAW)) { 548 tp->t_iflag = TTYDEF_IFLAG; 549 tp->t_oflag = TTYDEF_OFLAG; 550 tp->t_lflag = TTYDEF_LFLAG; 551 } else { 552 tp->t_iflag = 0; 553 tp->t_oflag = 0; 554 tp->t_lflag = 0; 555 } 556 ttychars(tp); 557 ttsetwater(tp); 558 559 if (ZSDIALOUT(dev)) 560 SET(tp->t_state, TS_CARR_ON); 561 else 562 CLR(tp->t_state, TS_CARR_ON); 563 564#if IPL_ZS != IPL_TTY 565 s2 = splzs(); 566#endif 567 568 /* Clear the input ring, and unblock. */ 569 zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf; 570 zst->zst_rbavail = zstty_rbuf_size; 571 zs_iflush(cs); 572 CLR(zst->zst_rx_flags, RX_ANY_BLOCK); 573 zs_hwiflow(zst); 574 575#if IPL_ZS != IPL_TTY 576 splx(s2); 577#endif 578 } 579 580 if (ZSDIALOUT(dev)) { 581 if (ISSET(tp->t_state, TS_ISOPEN)) { 582 /* someone already is dialed in... */ 583 splx(s); 584 return EBUSY; 585 } 586 cs->cs_cua = 1; 587 } 588 589 error = 0; 590 /* wait for carrier if necessary */ 591 if (ISSET(flags, O_NONBLOCK)) { 592 if (!ZSDIALOUT(dev) && cs->cs_cua) { 593 /* Opening TTY non-blocking... but the CUA is busy */ 594 error = EBUSY; 595 } 596 } else 597 while (cs->cs_cua || 598 (!ISSET(tp->t_cflag, CLOCAL) && !ISSET(tp->t_state, TS_CARR_ON))) { 599 int rr0; 600 601 error = 0; 602 SET(tp->t_state, TS_WOPEN); 603 604 if (!ZSDIALOUT(dev) && !cs->cs_cua) { 605 /* 606 * Turn on DTR. We must always do this on non-CUA 607 * devices, even if carrier is not present, because 608 * otherwise we'd have to use TIOCSDTR immediately 609 * after setting CLOCAL, which applications do not 610 * expect. We always assert DTR while the device is 611 * open unless explicitly requested to deassert it. 612 */ 613#if IPL_ZS != IPL_TTY 614 s2 = splzs(); 615#endif 616 zs_modem(zst, 1); 617 rr0 = zs_read_csr(cs); 618#if IPL_ZS != IPL_TTY 619 splx(s2); 620#endif 621 622 /* loop, turning on the device, until carrier present */ 623 if (ISSET(rr0, ZSRR0_DCD) || 624 ISSET(zst->zst_swflags, TIOCFLAG_SOFTCAR)) 625 SET(tp->t_state, TS_CARR_ON); 626 } 627 628 if ((ISSET(tp->t_cflag, CLOCAL) || 629 ISSET(tp->t_state, TS_CARR_ON)) && !cs->cs_cua) 630 break; 631 632 error = ttysleep(tp, (caddr_t)&tp->t_rawq, TTIPRI | PCATCH, 633 ttopen); 634 635 if (!ZSDIALOUT(dev) && cs->cs_cua && error == EINTR) { 636 error = 0; 637 continue; 638 } 639 640 if (error) { 641 if (!ISSET(tp->t_state, TS_ISOPEN)) { 642#if IPL_ZS != IPL_TTY 643 s2 = splzs(); 644#endif 645 zs_modem(zst, 0); 646#if IPL_ZS != IPL_TTY 647 splx(s2); 648#endif 649 CLR(tp->t_state, TS_WOPEN); 650 ttwakeup(tp); 651 } 652 if (ZSDIALOUT(dev)) 653 cs->cs_cua = 0; 654 CLR(tp->t_state, TS_WOPEN); 655 break; 656 } 657 if (!ZSDIALOUT(dev) && cs->cs_cua) 658 continue; 659 } 660 661 splx(s); 662 663 if (error == 0) 664 error = ((*linesw[tp->t_line].l_open)(dev, tp, p)); 665 if (error) 666 goto bad; 667 668 return (0); 669 670bad: 671 if (!ISSET(tp->t_state, TS_ISOPEN)) { 672 /* 673 * We failed to open the device, and nobody else had it opened. 674 * Clean up the state as appropriate. 675 */ 676 zs_shutdown(zst); 677 } 678 679 return (error); 680} 681 682/* 683 * Close a zs serial port. 684 */ 685int 686zsclose(dev_t dev, int flags, int mode, struct proc *p) 687{ 688 struct zstty_softc *zst = zs_device_lookup(&zstty_cd, ZSUNIT(dev)); 689 struct zs_chanstate *cs = zst->zst_cs; 690 struct tty *tp = zst->zst_tty; 691 int s; 692 693 /* XXX This is for cons.c. */ 694 if (!ISSET(tp->t_state, TS_ISOPEN)) 695 return 0; 696 697 (*linesw[tp->t_line].l_close)(tp, flags, p); 698 699 s = spltty(); 700 cs->cs_cua = 0; 701 ttyclose(tp); 702 splx(s); 703 704 if (!ISSET(tp->t_state, TS_ISOPEN)) { 705 /* 706 * Although we got a last close, the device may still be in 707 * use; e.g. if this was the dialout node, and there are still 708 * processes waiting for carrier on the non-dialout node. 709 */ 710 zs_shutdown(zst); 711 } 712 713 return (0); 714} 715 716/* 717 * Read/write zs serial port. 718 */ 719int 720zsread(dev_t dev, struct uio *uio, int flags) 721{ 722 struct zstty_softc *zst = zs_device_lookup(&zstty_cd, ZSUNIT(dev)); 723 struct tty *tp = zst->zst_tty; 724 725 return (*linesw[tp->t_line].l_read)(tp, uio, flags); 726} 727 728int 729zswrite(dev_t dev, struct uio *uio, int flags) 730{ 731 struct zstty_softc *zst = zs_device_lookup(&zstty_cd, ZSUNIT(dev)); 732 struct tty *tp = zst->zst_tty; 733 734 return (*linesw[tp->t_line].l_write)(tp, uio, flags); 735} 736 737int 738zsioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p) 739{ 740 struct zstty_softc *zst = zs_device_lookup(&zstty_cd, ZSUNIT(dev)); 741 struct zs_chanstate *cs = zst->zst_cs; 742 struct tty *tp = zst->zst_tty; 743 int error; 744 int s; 745 746 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); 747 if (error >= 0) 748 return (error); 749 750 error = ttioctl(tp, cmd, data, flag, p); 751 if (error >= 0) 752 return (error); 753 754#ifdef ZS_MD_IOCTL 755 error = ZS_MD_IOCTL; 756 if (error >= 0) 757 return (error); 758#endif /* ZS_MD_IOCTL */ 759 760 error = 0; 761 762 s = splzs(); 763 764 switch (cmd) { 765 case TIOCSBRK: 766 zs_break(cs, 1); 767 break; 768 769 case TIOCCBRK: 770 zs_break(cs, 0); 771 break; 772 773 case TIOCGFLAGS: 774 *(int *)data = zst->zst_swflags; 775 break; 776 777 case TIOCSFLAGS: 778 error = suser(p); 779 if (error) 780 break; 781 zst->zst_swflags = *(int *)data; 782 if (ISSET(zst->zst_hwflags, ZS_HWFLAG_NO_DCD)) 783 SET(zst->zst_swflags, TIOCFLAG_SOFTCAR); 784 break; 785 786 case TIOCSDTR: 787 zs_modem(zst, 1); 788 break; 789 790 case TIOCCDTR: 791 zs_modem(zst, 0); 792 break; 793 794 case TIOCMSET: 795 case TIOCMBIS: 796 case TIOCMBIC: 797 tiocm_to_zs(zst, cmd, *(int *)data); 798 break; 799 800 case TIOCMGET: 801 *(int *)data = zs_to_tiocm(zst); 802 break; 803 804 default: 805 error = ENOTTY; 806 break; 807 } 808 809 splx(s); 810 811 return (error); 812} 813 814/* 815 * Start or restart transmission. 816 */ 817void 818zsstart(struct tty *tp) 819{ 820 struct zstty_softc *zst = zs_device_lookup(&zstty_cd, ZSUNIT(tp->t_dev)); 821 struct zs_chanstate *cs = zst->zst_cs; 822 u_char *tba; 823 int tbc, rr0; 824 int s; 825 826 s = spltty(); 827 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 828 goto out; 829 if (zst->zst_tx_stopped) 830 goto out; 831 832 ttwakeupwr(tp); 833 if (tp->t_outq.c_cc == 0) 834 goto out; 835 836 /* Grab the first contiguous region of buffer space. */ 837 tba = tp->t_outq.c_cf; 838 tbc = ndqb(&tp->t_outq, 0); 839 840#if IPL_ZS != IPL_TTY 841 (void)splzs(); 842#endif 843 844 zst->zst_tba = tba; 845 zst->zst_tbc = tbc; 846 SET(tp->t_state, TS_BUSY); 847 zst->zst_tx_busy = 1; 848 849 do { 850 rr0 = zs_read_csr(cs); 851 if ((rr0 & ZSRR0_TX_READY) == 0) 852 break; 853 854 zs_write_data(cs, *zst->zst_tba); 855 zst->zst_tbc--; 856 zst->zst_tba++; 857 } while (zst->zst_tbc > 0); 858 859out: 860 splx(s); 861} 862 863/* 864 * Stop output, e.g., for ^S or output flush. 865 */ 866int 867zsstop(struct tty *tp, int flag) 868{ 869 struct zstty_softc *zst = zs_device_lookup(&zstty_cd, ZSUNIT(tp->t_dev)); 870 int s; 871 872 s = splzs(); 873 if (ISSET(tp->t_state, TS_BUSY)) { 874 /* Stop transmitting at the next chunk. */ 875 zst->zst_tbc = 0; 876 zst->zst_heldtbc = 0; 877 if (!ISSET(tp->t_state, TS_TTSTOP)) 878 SET(tp->t_state, TS_FLUSH); 879 } 880 splx(s); 881 return 0; 882} 883 884/* 885 * Set ZS tty parameters from termios. 886 * XXX - Should just copy the whole termios after 887 * making sure all the changes could be done. 888 */ 889int 890zsparam(struct tty *tp, struct termios *t) 891{ 892 struct zstty_softc *zst = zs_device_lookup(&zstty_cd, ZSUNIT(tp->t_dev)); 893 struct zs_chanstate *cs = zst->zst_cs; 894 int ospeed; 895 tcflag_t cflag; 896 uint8_t tmp3, tmp4, tmp5; 897 int s, error; 898 899 ospeed = t->c_ospeed; 900 cflag = t->c_cflag; 901 902 /* Check requested parameters. */ 903 if (ospeed < 0) 904 return (EINVAL); 905 if (t->c_ispeed && t->c_ispeed != ospeed) 906 return (EINVAL); 907 908 /* 909 * For the console, always force CLOCAL and !HUPCL, so that the port 910 * is always active. 911 */ 912 if (ISSET(zst->zst_swflags, TIOCFLAG_SOFTCAR) || 913 ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 914 SET(cflag, CLOCAL); 915 CLR(cflag, HUPCL); 916 } 917 918 /* 919 * Only whack the UART when params change. 920 * Some callers need to clear tp->t_ospeed 921 * to make sure initialization gets done. 922 */ 923 if (tp->t_ospeed == ospeed && 924 tp->t_cflag == cflag) 925 return (0); 926 927 /* 928 * Call MD functions to deal with changed 929 * clock modes or H/W flow control modes. 930 * The BRG divisor is set now. (reg 12,13) 931 */ 932 error = zs_set_speed(cs, ospeed); 933 if (error) 934 return (error); 935 error = zs_set_modes(cs, cflag); 936 if (error) 937 return (error); 938 939 /* 940 * Block interrupts so that state will not 941 * be altered until we are done setting it up. 942 * 943 * Initial values in cs_preg are set before 944 * our attach routine is called. The master 945 * interrupt enable is handled by zsc.c 946 * 947 */ 948 s = splzs(); 949 950 /* 951 * Recalculate which status ints to enable. 952 */ 953 zs_maskintr(zst); 954 955 /* Recompute character size bits. */ 956 tmp3 = cs->cs_preg[3]; 957 tmp5 = cs->cs_preg[5]; 958 CLR(tmp3, ZSWR3_RXSIZE); 959 CLR(tmp5, ZSWR5_TXSIZE); 960 switch (ISSET(cflag, CSIZE)) { 961 case CS5: 962 SET(tmp3, ZSWR3_RX_5); 963 SET(tmp5, ZSWR5_TX_5); 964 break; 965 case CS6: 966 SET(tmp3, ZSWR3_RX_6); 967 SET(tmp5, ZSWR5_TX_6); 968 break; 969 case CS7: 970 SET(tmp3, ZSWR3_RX_7); 971 SET(tmp5, ZSWR5_TX_7); 972 break; 973 case CS8: 974 SET(tmp3, ZSWR3_RX_8); 975 SET(tmp5, ZSWR5_TX_8); 976 break; 977 } 978 cs->cs_preg[3] = tmp3; 979 cs->cs_preg[5] = tmp5; 980 981 /* 982 * Recompute the stop bits and parity bits. Note that 983 * zs_set_speed() may have set clock selection bits etc. 984 * in wr4, so those must preserved. 985 */ 986 tmp4 = cs->cs_preg[4]; 987 CLR(tmp4, ZSWR4_SBMASK | ZSWR4_PARMASK); 988 if (ISSET(cflag, CSTOPB)) 989 SET(tmp4, ZSWR4_TWOSB); 990 else 991 SET(tmp4, ZSWR4_ONESB); 992 if (!ISSET(cflag, PARODD)) 993 SET(tmp4, ZSWR4_EVENP); 994 if (ISSET(cflag, PARENB)) 995 SET(tmp4, ZSWR4_PARENB); 996 cs->cs_preg[4] = tmp4; 997 998 /* And copy to tty. */ 999 tp->t_ispeed = 0; 1000 tp->t_ospeed = ospeed; 1001 tp->t_cflag = cflag; 1002 1003 /* 1004 * If nothing is being transmitted, set up new current values, 1005 * else mark them as pending. 1006 */ 1007 if (!cs->cs_heldchange) { 1008 if (zst->zst_tx_busy) { 1009 zst->zst_heldtbc = zst->zst_tbc; 1010 zst->zst_tbc = 0; 1011 cs->cs_heldchange = 1; 1012 } else 1013 zs_loadchannelregs(cs); 1014 } 1015 1016 /* 1017 * If hardware flow control is disabled, turn off the buffer water 1018 * marks and unblock any soft flow control state. Otherwise, enable 1019 * the water marks. 1020 */ 1021 if (!ISSET(cflag, CHWFLOW)) { 1022 zst->zst_r_hiwat = 0; 1023 zst->zst_r_lowat = 0; 1024 if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1025 CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1026 zst->zst_rx_ready = 1; 1027 cs->cs_softreq = 1; 1028 } 1029 if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 1030 CLR(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 1031 zs_hwiflow(zst); 1032 } 1033 } else { 1034 zst->zst_r_hiwat = zstty_rbuf_hiwat; 1035 zst->zst_r_lowat = zstty_rbuf_lowat; 1036 } 1037 1038 /* 1039 * Force a recheck of the hardware carrier and flow control status, 1040 * since we may have changed which bits we're looking at. 1041 */ 1042 zstty_stint(cs, 1); 1043 1044 splx(s); 1045 1046 /* 1047 * If hardware flow control is disabled, unblock any hard flow control 1048 * state. 1049 */ 1050 if (!ISSET(cflag, CHWFLOW)) { 1051 if (zst->zst_tx_stopped) { 1052 zst->zst_tx_stopped = 0; 1053 zsstart(tp); 1054 } 1055 } 1056 1057 zstty_softint(cs); 1058 1059 return (0); 1060} 1061 1062/* 1063 * Compute interrupt enable bits and set in the pending bits. Called both 1064 * in zsparam() and when PPS (pulse per second timing) state changes. 1065 * Must be called at splzs(). 1066 */ 1067void 1068zs_maskintr(struct zstty_softc *zst) 1069{ 1070 struct zs_chanstate *cs = zst->zst_cs; 1071 uint8_t tmp15; 1072 1073 cs->cs_rr0_mask = cs->cs_rr0_cts | cs->cs_rr0_dcd; 1074 if (zst->zst_ppsmask != 0) 1075 cs->cs_rr0_mask |= cs->cs_rr0_pps; 1076 tmp15 = cs->cs_preg[15]; 1077 if (ISSET(cs->cs_rr0_mask, ZSRR0_DCD)) 1078 SET(tmp15, ZSWR15_DCD_IE); 1079 else 1080 CLR(tmp15, ZSWR15_DCD_IE); 1081 if (ISSET(cs->cs_rr0_mask, ZSRR0_CTS)) 1082 SET(tmp15, ZSWR15_CTS_IE); 1083 else 1084 CLR(tmp15, ZSWR15_CTS_IE); 1085 cs->cs_preg[15] = tmp15; 1086} 1087 1088 1089/* 1090 * Raise or lower modem control (DTR/RTS) signals. If a character is 1091 * in transmission, the change is deferred. 1092 * Called at splzs(). 1093 */ 1094void 1095zs_modem(struct zstty_softc *zst, int onoff) 1096{ 1097 struct zs_chanstate *cs = zst->zst_cs, *ccs; 1098 1099 if (cs->cs_wr5_dtr == 0) 1100 return; 1101 1102 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs); 1103 1104 if (onoff) 1105 SET(ccs->cs_preg[5], cs->cs_wr5_dtr); 1106 else 1107 CLR(ccs->cs_preg[5], cs->cs_wr5_dtr); 1108 1109 if (!cs->cs_heldchange) { 1110 if (zst->zst_tx_busy) { 1111 zst->zst_heldtbc = zst->zst_tbc; 1112 zst->zst_tbc = 0; 1113 cs->cs_heldchange = 1; 1114 } else 1115 zs_loadchannelregs(cs); 1116 } 1117} 1118 1119/* 1120 * Set modem bits. 1121 * Called at splzs(). 1122 */ 1123void 1124tiocm_to_zs(struct zstty_softc *zst, u_long how, int ttybits) 1125{ 1126 struct zs_chanstate *cs = zst->zst_cs, *ccs; 1127 uint8_t zsbits; 1128 1129 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs); 1130 1131 zsbits = 0; 1132 if (ISSET(ttybits, TIOCM_DTR)) 1133 SET(zsbits, ZSWR5_DTR); 1134 if (ISSET(ttybits, TIOCM_RTS)) 1135 SET(zsbits, ZSWR5_RTS); 1136 1137 switch (how) { 1138 case TIOCMBIC: 1139 CLR(ccs->cs_preg[5], zsbits); 1140 break; 1141 1142 case TIOCMBIS: 1143 SET(ccs->cs_preg[5], zsbits); 1144 break; 1145 1146 case TIOCMSET: 1147 CLR(ccs->cs_preg[5], ZSWR5_RTS | ZSWR5_DTR); 1148 SET(ccs->cs_preg[5], zsbits); 1149 break; 1150 } 1151 1152 if (!cs->cs_heldchange) { 1153 if (zst->zst_tx_busy) { 1154 zst->zst_heldtbc = zst->zst_tbc; 1155 zst->zst_tbc = 0; 1156 cs->cs_heldchange = 1; 1157 } else 1158 zs_loadchannelregs(cs); 1159 } 1160} 1161 1162/* 1163 * Get modem bits. 1164 * Called at splzs(). 1165 */ 1166int 1167zs_to_tiocm(struct zstty_softc *zst) 1168{ 1169 struct zs_chanstate *cs = zst->zst_cs, *ccs; 1170 uint8_t zsbits; 1171 int ttybits = 0; 1172 1173 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs); 1174 1175 zsbits = ccs->cs_preg[5]; 1176 if (ISSET(zsbits, ZSWR5_DTR)) 1177 SET(ttybits, TIOCM_DTR); 1178 if (ISSET(zsbits, ZSWR5_RTS)) 1179 SET(ttybits, TIOCM_RTS); 1180 1181 zsbits = cs->cs_rr0; 1182 if (ISSET(zsbits, ZSRR0_DCD)) 1183 SET(ttybits, TIOCM_CD); 1184 if (ISSET(zsbits, ZSRR0_CTS)) 1185 SET(ttybits, TIOCM_CTS); 1186 1187 return (ttybits); 1188} 1189 1190/* 1191 * Try to block or unblock input using hardware flow-control. 1192 * This is called by kern/tty.c if MDMBUF|CRTSCTS is set, and 1193 * if this function returns non-zero, the TS_TBLOCK flag will 1194 * be set or cleared according to the "block" arg passed. 1195 */ 1196int 1197zshwiflow(struct tty *tp, int block) 1198{ 1199 struct zstty_softc *zst = zs_device_lookup(&zstty_cd, ZSUNIT(tp->t_dev)); 1200 struct zs_chanstate *cs = zst->zst_cs; 1201 int s; 1202 1203 if (cs->cs_wr5_rts == 0) 1204 return (0); 1205 1206 s = splzs(); 1207 if (block) { 1208 if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1209 SET(zst->zst_rx_flags, RX_TTY_BLOCKED); 1210 zs_hwiflow(zst); 1211 } 1212 } else { 1213 if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1214 CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1215 zst->zst_rx_ready = 1; 1216 cs->cs_softreq = 1; 1217 } 1218 if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1219 CLR(zst->zst_rx_flags, RX_TTY_BLOCKED); 1220 zs_hwiflow(zst); 1221 } 1222 } 1223 splx(s); 1224 return (1); 1225} 1226 1227/* 1228 * Internal version of zshwiflow 1229 * Called at splzs() 1230 */ 1231void 1232zs_hwiflow(struct zstty_softc *zst) 1233{ 1234 struct zs_chanstate *cs = zst->zst_cs, *ccs; 1235 1236 if (cs->cs_wr5_rts == 0) 1237 return; 1238 1239 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs); 1240 1241 if (ISSET(zst->zst_rx_flags, RX_ANY_BLOCK)) { 1242 CLR(ccs->cs_preg[5], cs->cs_wr5_rts); 1243 CLR(ccs->cs_creg[5], cs->cs_wr5_rts); 1244 } else { 1245 SET(ccs->cs_preg[5], cs->cs_wr5_rts); 1246 SET(ccs->cs_creg[5], cs->cs_wr5_rts); 1247 } 1248 zs_write_reg(ccs, 5, ccs->cs_creg[5]); 1249} 1250 1251 1252/**************************************************************** 1253 * Interface to the lower layer (zscc) 1254 ****************************************************************/ 1255 1256void zstty_rxsoft(struct zstty_softc *, struct tty *); 1257void zstty_txsoft(struct zstty_softc *, struct tty *); 1258void zstty_stsoft(struct zstty_softc *, struct tty *); 1259void zstty_diag(void *); 1260 1261/* 1262 * Receiver Ready interrupt. 1263 * Called at splzs(). 1264 */ 1265void 1266zstty_rxint(struct zs_chanstate *cs) 1267{ 1268 struct zstty_softc *zst = cs->cs_private; 1269 uint8_t *put, *end; 1270 u_int cc; 1271 uint8_t rr0, rr1, c; 1272 1273 end = zst->zst_ebuf; 1274 put = zst->zst_rbput; 1275 cc = zst->zst_rbavail; 1276 1277 while (cc > 0) { 1278 /* 1279 * First read the status, because reading the received char 1280 * destroys the status of this char. 1281 */ 1282 rr1 = zs_read_reg(cs, 1); 1283 c = zs_read_data(cs); 1284 1285 if (ISSET(rr1, ZSRR1_FE | ZSRR1_DO | ZSRR1_PE)) { 1286 /* Clear the receive error. */ 1287 zs_write_csr(cs, ZSWR0_RESET_ERRORS); 1288 } 1289 1290 put[0] = c; 1291 put[1] = rr1; 1292 put += 2; 1293 if (put >= end) 1294 put = zst->zst_rbuf; 1295 cc--; 1296 1297 rr0 = zs_read_csr(cs); 1298 if (!ISSET(rr0, ZSRR0_RX_READY)) 1299 break; 1300 } 1301 1302 /* 1303 * Current string of incoming characters ended because 1304 * no more data was available or we ran out of space. 1305 * Schedule a receive event if any data was received. 1306 * If we're out of space, turn off receive interrupts. 1307 */ 1308 zst->zst_rbput = put; 1309 zst->zst_rbavail = cc; 1310 if (!ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1311 zst->zst_rx_ready = 1; 1312 cs->cs_softreq = 1; 1313 } 1314 1315 /* 1316 * See if we are in danger of overflowing a buffer. If 1317 * so, use hardware flow control to ease the pressure. 1318 */ 1319 if (!ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED) && 1320 cc < zst->zst_r_hiwat) { 1321 SET(zst->zst_rx_flags, RX_IBUF_BLOCKED); 1322 zs_hwiflow(zst); 1323 } 1324 1325 /* 1326 * If we're out of space, disable receive interrupts 1327 * until the queue has drained a bit. 1328 */ 1329 if (!cc) { 1330 SET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED); 1331 CLR(cs->cs_preg[1], ZSWR1_RIE); 1332 cs->cs_creg[1] = cs->cs_preg[1]; 1333 zs_write_reg(cs, 1, cs->cs_creg[1]); 1334 } 1335} 1336 1337/* 1338 * Transmitter Ready interrupt. 1339 * Called at splzs(). 1340 */ 1341void 1342zstty_txint(struct zs_chanstate *cs) 1343{ 1344 struct zstty_softc *zst = cs->cs_private; 1345 int rr0; 1346 1347 zs_write_csr(cs, ZSWR0_RESET_TXINT); 1348 1349 /* 1350 * If we've delayed a parameter change, do it now, and restart 1351 * output. 1352 */ 1353 if (cs->cs_heldchange) { 1354 zs_loadchannelregs(cs); 1355 cs->cs_heldchange = 0; 1356 zst->zst_tbc = zst->zst_heldtbc; 1357 zst->zst_heldtbc = 0; 1358 } 1359 1360 while (zst->zst_tbc > 0) { 1361 rr0 = zs_read_csr(cs); 1362 if ((rr0 & ZSRR0_TX_READY) == 0) 1363 break; 1364 1365 zs_write_data(cs, *zst->zst_tba); 1366 zst->zst_tbc--; 1367 zst->zst_tba++; 1368 } 1369 1370 if (zst->zst_tbc == 0) { 1371 if (zst->zst_tx_busy) { 1372 zst->zst_tx_busy = 0; 1373 zst->zst_tx_done = 1; 1374 cs->cs_softreq = 1; 1375 } 1376 } 1377} 1378 1379#ifdef DDB 1380#include <ddb/db_var.h> 1381#define DB_CONSOLE db_console 1382#else 1383#define DB_CONSOLE 0 1384#endif 1385 1386/* 1387 * Status Change interrupt. 1388 * Called at splzs(). 1389 */ 1390void 1391zstty_stint(struct zs_chanstate *cs, int force) 1392{ 1393 struct zstty_softc *zst = cs->cs_private; 1394 struct tty *tp = zst->zst_tty; 1395 uint8_t rr0, delta; 1396 1397 rr0 = zs_read_csr(cs); 1398 zs_write_csr(cs, ZSWR0_RESET_STATUS); 1399 1400 /* 1401 * Check here for console break, so that we can abort 1402 * even when interrupts are locking up the machine. 1403 */ 1404 if ((zst->zst_hwflags & ZS_HWFLAG_CONSOLE_INPUT) && 1405 ISSET(rr0, ZSRR0_BREAK) && DB_CONSOLE) 1406 zs_abort(cs); 1407 1408 if (!force) 1409 delta = rr0 ^ cs->cs_rr0; 1410 else 1411 delta = cs->cs_rr0_mask; 1412 1413 ttytstamp(tp, cs->cs_rr0 & ZSRR0_CTS, rr0 & ZSRR0_CTS, 1414 cs->cs_rr0 & ZSRR0_DCD, rr0 & ZSRR0_DCD); 1415 1416 cs->cs_rr0 = rr0; 1417 1418 if (ISSET(delta, cs->cs_rr0_mask)) { 1419 SET(cs->cs_rr0_delta, delta); 1420 1421 /* 1422 * Stop output immediately if we lose the output 1423 * flow control signal or carrier detect. 1424 */ 1425 if (ISSET(~rr0, cs->cs_rr0_mask)) { 1426 zst->zst_tbc = 0; 1427 zst->zst_heldtbc = 0; 1428 } 1429 1430 zst->zst_st_check = 1; 1431 cs->cs_softreq = 1; 1432 } 1433} 1434 1435void 1436zstty_diag(void *arg) 1437{ 1438 struct zstty_softc *zst = arg; 1439 int overflows, floods; 1440 int s; 1441 1442 s = splzs(); 1443 overflows = zst->zst_overflows; 1444 zst->zst_overflows = 0; 1445 floods = zst->zst_floods; 1446 zst->zst_floods = 0; 1447 zst->zst_errors = 0; 1448 splx(s); 1449 1450 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1451 zst->zst_dev.dv_xname, 1452 overflows, overflows == 1 ? "" : "s", 1453 floods, floods == 1 ? "" : "s"); 1454} 1455 1456void 1457zstty_rxsoft(struct zstty_softc *zst, struct tty *tp) 1458{ 1459 struct zs_chanstate *cs = zst->zst_cs; 1460 int (*rint)(int, struct tty *) = linesw[tp->t_line].l_rint; 1461 uint8_t *get, *end; 1462 u_int cc, scc; 1463 uint8_t rr1; 1464 int code; 1465 int s; 1466 1467 end = zst->zst_ebuf; 1468 get = zst->zst_rbget; 1469 scc = cc = zstty_rbuf_size - zst->zst_rbavail; 1470 1471 if (cc == zstty_rbuf_size) { 1472 zst->zst_floods++; 1473 if (zst->zst_errors++ == 0) 1474 timeout_add_sec(&zst->zst_diag_ch, 60); 1475 } 1476 1477 /* If not yet open, drop the entire buffer content here */ 1478 if (!ISSET(tp->t_state, TS_ISOPEN)) { 1479 get += cc << 1; 1480 if (get >= end) 1481 get -= zstty_rbuf_size << 1; 1482 cc = 0; 1483 } 1484 while (cc) { 1485 code = get[0]; 1486 rr1 = get[1]; 1487 if (ISSET(rr1, ZSRR1_DO | ZSRR1_FE | ZSRR1_PE)) { 1488 if (ISSET(rr1, ZSRR1_DO)) { 1489 zst->zst_overflows++; 1490 if (zst->zst_errors++ == 0) 1491 timeout_add_sec(&zst->zst_diag_ch, 60); 1492 } 1493 if (ISSET(rr1, ZSRR1_FE)) 1494 SET(code, TTY_FE); 1495 if (ISSET(rr1, ZSRR1_PE)) 1496 SET(code, TTY_PE); 1497 } 1498 if ((*rint)(code, tp) == -1) { 1499 /* 1500 * The line discipline's buffer is out of space. 1501 */ 1502 if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1503 /* 1504 * We're either not using flow control, or the 1505 * line discipline didn't tell us to block for 1506 * some reason. Either way, we have no way to 1507 * know when there's more space available, so 1508 * just drop the rest of the data. 1509 */ 1510 get += cc << 1; 1511 if (get >= end) 1512 get -= zstty_rbuf_size << 1; 1513 cc = 0; 1514 } else { 1515 /* 1516 * Don't schedule any more receive processing 1517 * until the line discipline tells us there's 1518 * space available (through comhwiflow()). 1519 * Leave the rest of the data in the input 1520 * buffer. 1521 */ 1522 SET(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1523 } 1524 break; 1525 } 1526 get += 2; 1527 if (get >= end) 1528 get = zst->zst_rbuf; 1529 cc--; 1530 } 1531 1532 if (cc != scc) { 1533 zst->zst_rbget = get; 1534 s = splzs(); 1535 cc = zst->zst_rbavail += scc - cc; 1536 /* Buffers should be ok again, release possible block. */ 1537 if (cc >= zst->zst_r_lowat) { 1538 if (ISSET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED)) { 1539 CLR(zst->zst_rx_flags, RX_IBUF_OVERFLOWED); 1540 SET(cs->cs_preg[1], ZSWR1_RIE); 1541 cs->cs_creg[1] = cs->cs_preg[1]; 1542 zs_write_reg(cs, 1, cs->cs_creg[1]); 1543 } 1544 if (ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED)) { 1545 CLR(zst->zst_rx_flags, RX_IBUF_BLOCKED); 1546 zs_hwiflow(zst); 1547 } 1548 } 1549 splx(s); 1550 } 1551} 1552 1553void 1554zstty_txsoft(struct zstty_softc *zst, struct tty *tp) 1555{ 1556 int s; 1557 1558 CLR(tp->t_state, TS_BUSY); 1559 if (ISSET(tp->t_state, TS_FLUSH)) 1560 CLR(tp->t_state, TS_FLUSH); 1561 else { 1562 s = splzs(); 1563 ndflush(&tp->t_outq, (int)(zst->zst_tba - tp->t_outq.c_cf)); 1564 splx(s); 1565 } 1566 (*linesw[tp->t_line].l_start)(tp); 1567} 1568 1569void 1570zstty_stsoft(struct zstty_softc *zst, struct tty *tp) 1571{ 1572 struct zs_chanstate *cs = zst->zst_cs; 1573 uint8_t rr0, delta; 1574 int s; 1575 1576 s = splzs(); 1577 rr0 = cs->cs_rr0; 1578 delta = cs->cs_rr0_delta; 1579 cs->cs_rr0_delta = 0; 1580 splx(s); 1581 1582 if (ISSET(delta, cs->cs_rr0_dcd)) { 1583 /* 1584 * Inform the tty layer that carrier detect changed. 1585 */ 1586 (void)(*linesw[tp->t_line].l_modem)(tp, ISSET(rr0, ZSRR0_DCD)); 1587 } 1588 1589 if (ISSET(delta, cs->cs_rr0_cts)) { 1590 /* Block or unblock output according to flow control. */ 1591 if (ISSET(rr0, cs->cs_rr0_cts)) { 1592 zst->zst_tx_stopped = 0; 1593 (*linesw[tp->t_line].l_start)(tp); 1594 } else { 1595 zst->zst_tx_stopped = 1; 1596 } 1597 } 1598} 1599 1600/* 1601 * Software interrupt. Called at zssoft 1602 * 1603 * The main job to be done here is to empty the input ring 1604 * by passing its contents up to the tty layer. The ring is 1605 * always emptied during this operation, therefore the ring 1606 * must not be larger than the space after "high water" in 1607 * the tty layer, or the tty layer might drop our input. 1608 * 1609 * Note: an "input blockage" condition is assumed to exist if 1610 * EITHER the TS_TBLOCK flag or zst_rx_blocked flag is set. 1611 */ 1612void 1613zstty_softint(struct zs_chanstate *cs) 1614{ 1615 struct zstty_softc *zst = cs->cs_private; 1616 struct tty *tp = zst->zst_tty; 1617 int s; 1618 1619 s = spltty(); 1620 1621 if (zst->zst_rx_ready) { 1622 zst->zst_rx_ready = 0; 1623 zstty_rxsoft(zst, tp); 1624 } 1625 1626 if (zst->zst_st_check) { 1627 zst->zst_st_check = 0; 1628 zstty_stsoft(zst, tp); 1629 } 1630 1631 if (zst->zst_tx_done) { 1632 zst->zst_tx_done = 0; 1633 zstty_txsoft(zst, tp); 1634 } 1635 1636 splx(s); 1637} 1638 1639struct zsops zsops_tty = { 1640 zstty_rxint, /* receive char available */ 1641 zstty_stint, /* external/status */ 1642 zstty_txint, /* xmit buffer empty */ 1643 zstty_softint, /* process software interrupt */ 1644}; 1645