z8530tty.c revision 1.91
1 /* $NetBSD: z8530tty.c,v 1.91 2003/06/29 22:30:15 fvdl 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 (at) netbsd.org>, 94 * Bill Studenmund <wrstuden (at) loki.stanford.edu> 95 * Ian Dall <Ian.Dall (at) 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/cdefs.h> 102 __KERNEL_RCSID(0, "$NetBSD: z8530tty.c,v 1.91 2003/06/29 22:30:15 fvdl Exp $"); 103 104 #include "opt_kgdb.h" 105 106 #include <sys/param.h> 107 #include <sys/systm.h> 108 #include <sys/proc.h> 109 #include <sys/device.h> 110 #include <sys/conf.h> 111 #include <sys/file.h> 112 #include <sys/ioctl.h> 113 #include <sys/malloc.h> 114 #include <sys/timepps.h> 115 #include <sys/tty.h> 116 #include <sys/time.h> 117 #include <sys/kernel.h> 118 #include <sys/syslog.h> 119 120 #include <dev/ic/z8530reg.h> 121 #include <machine/z8530var.h> 122 123 #include <dev/cons.h> 124 125 #include "locators.h" 126 127 /* 128 * How many input characters we can buffer. 129 * The port-specific var.h may override this. 130 * Note: must be a power of two! 131 */ 132 #ifndef ZSTTY_RING_SIZE 133 #define ZSTTY_RING_SIZE 2048 134 #endif 135 136 static struct cnm_state zstty_cnm_state; 137 /* 138 * Make this an option variable one can patch. 139 * But be warned: this must be a power of 2! 140 */ 141 u_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. */ 144 u_int zstty_rbuf_hiwat = (ZSTTY_RING_SIZE * 1) / 4; 145 u_int zstty_rbuf_lowat = (ZSTTY_RING_SIZE * 3) / 4; 146 147 static int zsppscap = 148 PPS_TSFMT_TSPEC | 149 PPS_CAPTUREASSERT | 150 PPS_CAPTURECLEAR | 151 #ifdef PPS_SYNC 152 PPS_HARDPPSONASSERT | PPS_HARDPPSONCLEAR | 153 #endif /* PPS_SYNC */ 154 PPS_OFFSETASSERT | PPS_OFFSETCLEAR; 155 156 struct zstty_softc { 157 struct device zst_dev; /* required first: base device */ 158 struct tty *zst_tty; 159 struct zs_chanstate *zst_cs; 160 161 struct callout zst_diag_ch; 162 163 u_int zst_overflows, 164 zst_floods, 165 zst_errors; 166 167 int zst_hwflags, /* see z8530var.h */ 168 zst_swflags; /* TIOCFLAG_SOFTCAR, ... <ttycom.h> */ 169 170 u_int zst_r_hiwat, 171 zst_r_lowat; 172 u_char *volatile zst_rbget, 173 *volatile zst_rbput; 174 volatile u_int zst_rbavail; 175 u_char *zst_rbuf, 176 *zst_ebuf; 177 178 /* 179 * The transmit byte count and address are used for pseudo-DMA 180 * output in the hardware interrupt code. PDMA can be suspended 181 * to get pending changes done; heldtbc is used for this. It can 182 * also be stopped for ^S; this sets TS_TTSTOP in tp->t_state. 183 */ 184 u_char *zst_tba; /* transmit buffer address */ 185 u_int zst_tbc, /* transmit byte count */ 186 zst_heldtbc; /* held tbc while xmission stopped */ 187 188 /* Flags to communicate with zstty_softint() */ 189 volatile u_char zst_rx_flags, /* receiver blocked */ 190 #define RX_TTY_BLOCKED 0x01 191 #define RX_TTY_OVERFLOWED 0x02 192 #define RX_IBUF_BLOCKED 0x04 193 #define RX_IBUF_OVERFLOWED 0x08 194 #define RX_ANY_BLOCK 0x0f 195 zst_tx_busy, /* working on an output chunk */ 196 zst_tx_done, /* done with one output chunk */ 197 zst_tx_stopped, /* H/W level stop (lost CTS) */ 198 zst_st_check, /* got a status interrupt */ 199 zst_rx_ready; 200 201 /* PPS signal on DCD, with or without inkernel clock disciplining */ 202 u_char zst_ppsmask; /* pps signal mask */ 203 u_char zst_ppsassert; /* pps leading edge */ 204 u_char zst_ppsclear; /* pps trailing edge */ 205 pps_info_t ppsinfo; 206 pps_params_t ppsparam; 207 }; 208 209 /* Macros to clear/set/test flags. */ 210 #define SET(t, f) (t) |= (f) 211 #define CLR(t, f) (t) &= ~(f) 212 #define ISSET(t, f) ((t) & (f)) 213 214 /* Definition of the driver for autoconfig. */ 215 static int zstty_match(struct device *, struct cfdata *, void *); 216 static void zstty_attach(struct device *, struct device *, void *); 217 218 CFATTACH_DECL(zstty, sizeof(struct zstty_softc), 219 zstty_match, zstty_attach, NULL, NULL); 220 221 extern struct cfdriver zstty_cd; 222 223 dev_type_open(zsopen); 224 dev_type_close(zsclose); 225 dev_type_read(zsread); 226 dev_type_write(zswrite); 227 dev_type_ioctl(zsioctl); 228 dev_type_stop(zsstop); 229 dev_type_tty(zstty); 230 dev_type_poll(zspoll); 231 232 const struct cdevsw zstty_cdevsw = { 233 zsopen, zsclose, zsread, zswrite, zsioctl, 234 zsstop, zstty, zspoll, nommap, ttykqfilter, D_TTY 235 }; 236 237 struct zsops zsops_tty; 238 239 static void zs_shutdown __P((struct zstty_softc *)); 240 static void zsstart __P((struct tty *)); 241 static int zsparam __P((struct tty *, struct termios *)); 242 static void zs_modem __P((struct zstty_softc *, int)); 243 static void tiocm_to_zs __P((struct zstty_softc *, u_long, int)); 244 static int zs_to_tiocm __P((struct zstty_softc *)); 245 static int zshwiflow __P((struct tty *, int)); 246 static void zs_hwiflow __P((struct zstty_softc *)); 247 static void zs_maskintr __P((struct zstty_softc *)); 248 249 /* Low-level routines. */ 250 static void zstty_rxint __P((struct zs_chanstate *)); 251 static void zstty_stint __P((struct zs_chanstate *, int)); 252 static void zstty_txint __P((struct zs_chanstate *)); 253 static void zstty_softint __P((struct zs_chanstate *)); 254 255 #define ZSUNIT(x) (minor(x) & 0x7ffff) 256 #define ZSDIALOUT(x) (minor(x) & 0x80000) 257 258 /* 259 * zstty_match: how is this zs channel configured? 260 */ 261 int 262 zstty_match(parent, cf, aux) 263 struct device *parent; 264 struct cfdata *cf; 265 void *aux; 266 { 267 struct zsc_attach_args *args = aux; 268 269 /* Exact match is better than wildcard. */ 270 if (cf->cf_loc[ZSCCF_CHANNEL] == args->channel) 271 return 2; 272 273 /* This driver accepts wildcard. */ 274 if (cf->cf_loc[ZSCCF_CHANNEL] == ZSCCF_CHANNEL_DEFAULT) 275 return 1; 276 277 return 0; 278 } 279 280 void 281 zstty_attach(parent, self, aux) 282 struct device *parent, *self; 283 void *aux; 284 285 { 286 struct zsc_softc *zsc = (void *) parent; 287 struct zstty_softc *zst = (void *) self; 288 struct cfdata *cf = self->dv_cfdata; 289 struct zsc_attach_args *args = aux; 290 struct zs_chanstate *cs; 291 struct tty *tp; 292 int channel, s, tty_unit; 293 dev_t dev; 294 char *i, *o; 295 int dtr_on; 296 int resetbit; 297 298 callout_init(&zst->zst_diag_ch); 299 cn_init_magic(&zstty_cnm_state); 300 301 tty_unit = zst->zst_dev.dv_unit; 302 channel = args->channel; 303 cs = zsc->zsc_cs[channel]; 304 cs->cs_private = zst; 305 cs->cs_ops = &zsops_tty; 306 307 zst->zst_cs = cs; 308 zst->zst_swflags = cf->cf_flags; /* softcar, etc. */ 309 zst->zst_hwflags = args->hwflags; 310 dev = makedev(cdevsw_lookup_major(&zstty_cdevsw), tty_unit); 311 312 if (zst->zst_swflags) 313 printf(" flags 0x%x", zst->zst_swflags); 314 315 /* 316 * Check whether we serve as a console device. 317 * XXX - split console input/output channels aren't 318 * supported yet on /dev/console 319 */ 320 i = o = NULL; 321 if ((zst->zst_hwflags & ZS_HWFLAG_CONSOLE_INPUT) != 0) { 322 i = "input"; 323 if ((args->hwflags & ZS_HWFLAG_USE_CONSDEV) != 0) { 324 args->consdev->cn_dev = dev; 325 cn_tab->cn_pollc = args->consdev->cn_pollc; 326 cn_tab->cn_getc = args->consdev->cn_getc; 327 } 328 cn_tab->cn_dev = dev; 329 /* Set console magic to BREAK */ 330 cn_set_magic("\047\001"); 331 } 332 if ((zst->zst_hwflags & ZS_HWFLAG_CONSOLE_OUTPUT) != 0) { 333 o = "output"; 334 if ((args->hwflags & ZS_HWFLAG_USE_CONSDEV) != 0) { 335 cn_tab->cn_putc = args->consdev->cn_putc; 336 } 337 cn_tab->cn_dev = dev; 338 } 339 if (i != NULL || o != NULL) 340 printf(" (console %s)", i ? (o ? "i/o" : i) : o); 341 342 #ifdef KGDB 343 if (zs_check_kgdb(cs, dev)) { 344 /* 345 * Allow kgdb to "take over" this port. Returns true 346 * if this serial port is in-use by kgdb. 347 */ 348 printf(" (kgdb)\n"); 349 /* 350 * This is the kgdb port (exclusive use) 351 * so skip the normal attach code. 352 */ 353 return; 354 } 355 #endif 356 printf("\n"); 357 358 tp = ttymalloc(); 359 tp->t_dev = dev; 360 tp->t_oproc = zsstart; 361 tp->t_param = zsparam; 362 tp->t_hwiflow = zshwiflow; 363 tty_attach(tp); 364 365 zst->zst_tty = tp; 366 zst->zst_rbuf = malloc(zstty_rbuf_size << 1, M_DEVBUF, M_WAITOK); 367 zst->zst_ebuf = zst->zst_rbuf + (zstty_rbuf_size << 1); 368 /* Disable the high water mark. */ 369 zst->zst_r_hiwat = 0; 370 zst->zst_r_lowat = 0; 371 zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf; 372 zst->zst_rbavail = zstty_rbuf_size; 373 374 /* if there are no enable/disable functions, assume the device 375 is always enabled */ 376 if (!cs->enable) 377 cs->enabled = 1; 378 379 /* 380 * Hardware init 381 */ 382 dtr_on = 0; 383 resetbit = 0; 384 if (ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 385 /* Call zsparam similar to open. */ 386 struct termios t; 387 388 /* Wait a while for previous console output to complete */ 389 DELAY(10000); 390 391 /* Setup the "new" parameters in t. */ 392 t.c_ispeed = 0; 393 t.c_ospeed = cs->cs_defspeed; 394 t.c_cflag = cs->cs_defcflag; 395 396 /* 397 * Turn on receiver and status interrupts. 398 * We defer the actual write of the register to zsparam(), 399 * but we must make sure status interrupts are turned on by 400 * the time zsparam() reads the initial rr0 state. 401 */ 402 SET(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE); 403 404 /* Make sure zsparam will see changes. */ 405 tp->t_ospeed = 0; 406 (void) zsparam(tp, &t); 407 408 /* Make sure DTR is on now. */ 409 dtr_on = 1; 410 411 } else if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_NORESET)) { 412 /* Not the console; may need reset. */ 413 resetbit = (channel == 0) ? ZSWR9_A_RESET : ZSWR9_B_RESET; 414 } 415 416 s = splzs(); 417 simple_lock(&cs->cs_lock); 418 if (resetbit) 419 zs_write_reg(cs, 9, resetbit); 420 zs_modem(zst, dtr_on); 421 simple_unlock(&cs->cs_lock); 422 splx(s); 423 } 424 425 426 /* 427 * Return pointer to our tty. 428 */ 429 struct tty * 430 zstty(dev) 431 dev_t dev; 432 { 433 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 434 435 return (zst->zst_tty); 436 } 437 438 439 void 440 zs_shutdown(zst) 441 struct zstty_softc *zst; 442 { 443 struct zs_chanstate *cs = zst->zst_cs; 444 struct tty *tp = zst->zst_tty; 445 int s; 446 447 s = splzs(); 448 simple_lock(&cs->cs_lock); 449 450 /* If we were asserting flow control, then deassert it. */ 451 SET(zst->zst_rx_flags, RX_IBUF_BLOCKED); 452 zs_hwiflow(zst); 453 454 /* Clear any break condition set with TIOCSBRK. */ 455 zs_break(cs, 0); 456 457 /* Turn off PPS capture on last close. */ 458 zst->zst_ppsmask = 0; 459 zst->ppsparam.mode = 0; 460 461 /* 462 * Hang up if necessary. Wait a bit, so the other side has time to 463 * notice even if we immediately open the port again. 464 */ 465 if (ISSET(tp->t_cflag, HUPCL)) { 466 zs_modem(zst, 0); 467 simple_unlock(&cs->cs_lock); 468 splx(s); 469 /* 470 * XXX - another process is not prevented from opening 471 * the device during our sleep. 472 */ 473 (void) tsleep(cs, TTIPRI, ttclos, hz); 474 /* Re-check state in case we were opened during our sleep */ 475 if (ISSET(tp->t_state, TS_ISOPEN) || tp->t_wopen != 0) 476 return; 477 478 s = splzs(); 479 simple_lock(&cs->cs_lock); 480 } 481 482 /* Turn off interrupts if not the console. */ 483 if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 484 CLR(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE); 485 cs->cs_creg[1] = cs->cs_preg[1]; 486 zs_write_reg(cs, 1, cs->cs_creg[1]); 487 } 488 489 /* Call the power management hook. */ 490 if (cs->disable) { 491 #ifdef DIAGNOSTIC 492 if (!cs->enabled) 493 panic("zs_shutdown: not enabled?"); 494 #endif 495 (*cs->disable)(zst->zst_cs); 496 } 497 498 simple_unlock(&cs->cs_lock); 499 splx(s); 500 } 501 502 /* 503 * Open a zs serial (tty) port. 504 */ 505 int 506 zsopen(dev, flags, mode, p) 507 dev_t dev; 508 int flags; 509 int mode; 510 struct proc *p; 511 { 512 struct zstty_softc *zst; 513 struct zs_chanstate *cs; 514 struct tty *tp; 515 int s, s2; 516 int error; 517 518 zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 519 if (zst == NULL) 520 return (ENXIO); 521 522 tp = zst->zst_tty; 523 cs = zst->zst_cs; 524 525 /* If KGDB took the line, then tp==NULL */ 526 if (tp == NULL) 527 return (EBUSY); 528 529 if (ISSET(tp->t_state, TS_ISOPEN) && 530 ISSET(tp->t_state, TS_XCLUDE) && 531 p->p_ucred->cr_uid != 0) 532 return (EBUSY); 533 534 s = spltty(); 535 536 /* 537 * Do the following iff this is a first open. 538 */ 539 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 540 struct termios t; 541 542 tp->t_dev = dev; 543 544 /* Call the power management hook. */ 545 if (cs->enable) { 546 if ((*cs->enable)(cs)) { 547 splx(s); 548 printf("%s: device enable failed\n", 549 zst->zst_dev.dv_xname); 550 return (EIO); 551 } 552 } 553 554 /* 555 * Initialize the termios status to the defaults. Add in the 556 * sticky bits from TIOCSFLAGS. 557 */ 558 t.c_ispeed = 0; 559 t.c_ospeed = cs->cs_defspeed; 560 t.c_cflag = cs->cs_defcflag; 561 if (ISSET(zst->zst_swflags, TIOCFLAG_CLOCAL)) 562 SET(t.c_cflag, CLOCAL); 563 if (ISSET(zst->zst_swflags, TIOCFLAG_CRTSCTS)) 564 SET(t.c_cflag, CRTSCTS); 565 if (ISSET(zst->zst_swflags, TIOCFLAG_CDTRCTS)) 566 SET(t.c_cflag, CDTRCTS); 567 if (ISSET(zst->zst_swflags, TIOCFLAG_MDMBUF)) 568 SET(t.c_cflag, MDMBUF); 569 570 s2 = splzs(); 571 simple_lock(&cs->cs_lock); 572 573 /* 574 * Turn on receiver and status interrupts. 575 * We defer the actual write of the register to zsparam(), 576 * but we must make sure status interrupts are turned on by 577 * the time zsparam() reads the initial rr0 state. 578 */ 579 SET(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE); 580 581 /* Clear PPS capture state on first open. */ 582 zst->zst_ppsmask = 0; 583 zst->ppsparam.mode = 0; 584 585 simple_unlock(&cs->cs_lock); 586 splx(s2); 587 588 /* Make sure zsparam will see changes. */ 589 tp->t_ospeed = 0; 590 (void) zsparam(tp, &t); 591 592 /* 593 * Note: zsparam has done: cflag, ispeed, ospeed 594 * so we just need to do: iflag, oflag, lflag, cc 595 * For "raw" mode, just leave all zeros. 596 */ 597 if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_RAW)) { 598 tp->t_iflag = TTYDEF_IFLAG; 599 tp->t_oflag = TTYDEF_OFLAG; 600 tp->t_lflag = TTYDEF_LFLAG; 601 } else { 602 tp->t_iflag = 0; 603 tp->t_oflag = 0; 604 tp->t_lflag = 0; 605 } 606 ttychars(tp); 607 ttsetwater(tp); 608 609 s2 = splzs(); 610 simple_lock(&cs->cs_lock); 611 612 /* 613 * Turn on DTR. We must always do this, even if carrier is not 614 * present, because otherwise we'd have to use TIOCSDTR 615 * immediately after setting CLOCAL, which applications do not 616 * expect. We always assert DTR while the device is open 617 * unless explicitly requested to deassert it. 618 */ 619 zs_modem(zst, 1); 620 621 /* Clear the input ring, and unblock. */ 622 zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf; 623 zst->zst_rbavail = zstty_rbuf_size; 624 zs_iflush(cs); 625 CLR(zst->zst_rx_flags, RX_ANY_BLOCK); 626 zs_hwiflow(zst); 627 628 simple_unlock(&cs->cs_lock); 629 splx(s2); 630 } 631 632 splx(s); 633 634 error = ttyopen(tp, ZSDIALOUT(dev), ISSET(flags, O_NONBLOCK)); 635 if (error) 636 goto bad; 637 638 error = (*tp->t_linesw->l_open)(dev, tp); 639 if (error) 640 goto bad; 641 642 return (0); 643 644 bad: 645 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 646 /* 647 * We failed to open the device, and nobody else had it opened. 648 * Clean up the state as appropriate. 649 */ 650 zs_shutdown(zst); 651 } 652 653 return (error); 654 } 655 656 /* 657 * Close a zs serial port. 658 */ 659 int 660 zsclose(dev, flags, mode, p) 661 dev_t dev; 662 int flags; 663 int mode; 664 struct proc *p; 665 { 666 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 667 struct tty *tp = zst->zst_tty; 668 669 /* XXX This is for cons.c. */ 670 if (!ISSET(tp->t_state, TS_ISOPEN)) 671 return 0; 672 673 (*tp->t_linesw->l_close)(tp, flags); 674 ttyclose(tp); 675 676 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 677 /* 678 * Although we got a last close, the device may still be in 679 * use; e.g. if this was the dialout node, and there are still 680 * processes waiting for carrier on the non-dialout node. 681 */ 682 zs_shutdown(zst); 683 } 684 685 return (0); 686 } 687 688 /* 689 * Read/write zs serial port. 690 */ 691 int 692 zsread(dev, uio, flags) 693 dev_t dev; 694 struct uio *uio; 695 int flags; 696 { 697 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 698 struct tty *tp = zst->zst_tty; 699 700 return ((*tp->t_linesw->l_read)(tp, uio, flags)); 701 } 702 703 int 704 zswrite(dev, uio, flags) 705 dev_t dev; 706 struct uio *uio; 707 int flags; 708 { 709 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 710 struct tty *tp = zst->zst_tty; 711 712 return ((*tp->t_linesw->l_write)(tp, uio, flags)); 713 } 714 715 int 716 zspoll(dev, events, p) 717 dev_t dev; 718 int events; 719 struct proc *p; 720 { 721 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 722 struct tty *tp = zst->zst_tty; 723 724 return ((*tp->t_linesw->l_poll)(tp, events, p)); 725 } 726 727 int 728 zsioctl(dev, cmd, data, flag, p) 729 dev_t dev; 730 u_long cmd; 731 caddr_t data; 732 int flag; 733 struct proc *p; 734 { 735 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 736 struct zs_chanstate *cs = zst->zst_cs; 737 struct tty *tp = zst->zst_tty; 738 int error; 739 int s; 740 741 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, p); 742 if (error != EPASSTHROUGH) 743 return (error); 744 745 error = ttioctl(tp, cmd, data, flag, p); 746 if (error != EPASSTHROUGH) 747 return (error); 748 749 #ifdef ZS_MD_IOCTL 750 error = ZS_MD_IOCTL(cs, cmd, data); 751 if (error != EPASSTHROUGH) 752 return (error); 753 #endif /* ZS_MD_IOCTL */ 754 755 error = 0; 756 757 s = splzs(); 758 simple_lock(&cs->cs_lock); 759 760 switch (cmd) { 761 case TIOCSBRK: 762 zs_break(cs, 1); 763 break; 764 765 case TIOCCBRK: 766 zs_break(cs, 0); 767 break; 768 769 case TIOCGFLAGS: 770 *(int *)data = zst->zst_swflags; 771 break; 772 773 case TIOCSFLAGS: 774 error = suser(p->p_ucred, &p->p_acflag); 775 if (error) 776 break; 777 zst->zst_swflags = *(int *)data; 778 break; 779 780 case TIOCSDTR: 781 zs_modem(zst, 1); 782 break; 783 784 case TIOCCDTR: 785 zs_modem(zst, 0); 786 break; 787 788 case TIOCMSET: 789 case TIOCMBIS: 790 case TIOCMBIC: 791 tiocm_to_zs(zst, cmd, *(int *)data); 792 break; 793 794 case TIOCMGET: 795 *(int *)data = zs_to_tiocm(zst); 796 break; 797 798 case PPS_IOC_CREATE: 799 break; 800 801 case PPS_IOC_DESTROY: 802 break; 803 804 case PPS_IOC_GETPARAMS: { 805 pps_params_t *pp; 806 pp = (pps_params_t *)data; 807 *pp = zst->ppsparam; 808 break; 809 } 810 811 case PPS_IOC_SETPARAMS: { 812 pps_params_t *pp; 813 int mode; 814 if (cs->cs_rr0_pps == 0) { 815 error = EINVAL; 816 break; 817 } 818 pp = (pps_params_t *)data; 819 if (pp->mode & ~zsppscap) { 820 error = EINVAL; 821 break; 822 } 823 zst->ppsparam = *pp; 824 /* 825 * compute masks from user-specified timestamp state. 826 */ 827 mode = zst->ppsparam.mode; 828 #ifdef PPS_SYNC 829 if (mode & PPS_HARDPPSONASSERT) { 830 mode |= PPS_CAPTUREASSERT; 831 /* XXX revoke any previous HARDPPS source */ 832 } 833 if (mode & PPS_HARDPPSONCLEAR) { 834 mode |= PPS_CAPTURECLEAR; 835 /* XXX revoke any previous HARDPPS source */ 836 } 837 #endif /* PPS_SYNC */ 838 switch (mode & PPS_CAPTUREBOTH) { 839 case 0: 840 zst->zst_ppsmask = 0; 841 break; 842 843 case PPS_CAPTUREASSERT: 844 zst->zst_ppsmask = ZSRR0_DCD; 845 zst->zst_ppsassert = ZSRR0_DCD; 846 zst->zst_ppsclear = -1; 847 break; 848 849 case PPS_CAPTURECLEAR: 850 zst->zst_ppsmask = ZSRR0_DCD; 851 zst->zst_ppsassert = -1; 852 zst->zst_ppsclear = 0; 853 break; 854 855 case PPS_CAPTUREBOTH: 856 zst->zst_ppsmask = ZSRR0_DCD; 857 zst->zst_ppsassert = ZSRR0_DCD; 858 zst->zst_ppsclear = 0; 859 break; 860 861 default: 862 error = EINVAL; 863 break; 864 } 865 866 /* 867 * Now update interrupts. 868 */ 869 zs_maskintr(zst); 870 /* 871 * If nothing is being transmitted, set up new current values, 872 * else mark them as pending. 873 */ 874 if (!cs->cs_heldchange) { 875 if (zst->zst_tx_busy) { 876 zst->zst_heldtbc = zst->zst_tbc; 877 zst->zst_tbc = 0; 878 cs->cs_heldchange = 1; 879 } else 880 zs_loadchannelregs(cs); 881 } 882 883 break; 884 } 885 886 case PPS_IOC_GETCAP: 887 *(int *)data = zsppscap; 888 break; 889 890 case PPS_IOC_FETCH: { 891 pps_info_t *pi; 892 pi = (pps_info_t *)data; 893 *pi = zst->ppsinfo; 894 break; 895 } 896 897 case TIOCDCDTIMESTAMP: /* XXX old, overloaded API used by xntpd v3 */ 898 if (cs->cs_rr0_pps == 0) { 899 error = EINVAL; 900 break; 901 } 902 /* 903 * Some GPS clocks models use the falling rather than 904 * rising edge as the on-the-second signal. 905 * The old API has no way to specify PPS polarity. 906 */ 907 zst->zst_ppsmask = ZSRR0_DCD; 908 #ifndef PPS_TRAILING_EDGE 909 zst->zst_ppsassert = ZSRR0_DCD; 910 zst->zst_ppsclear = -1; 911 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 912 &zst->ppsinfo.assert_timestamp); 913 #else 914 zst->zst_ppsassert = -1; 915 zst->zst_ppsclear = 01; 916 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 917 &zst->ppsinfo.clear_timestamp); 918 #endif 919 /* 920 * Now update interrupts. 921 */ 922 zs_maskintr(zst); 923 /* 924 * If nothing is being transmitted, set up new current values, 925 * else mark them as pending. 926 */ 927 if (!cs->cs_heldchange) { 928 if (zst->zst_tx_busy) { 929 zst->zst_heldtbc = zst->zst_tbc; 930 zst->zst_tbc = 0; 931 cs->cs_heldchange = 1; 932 } else 933 zs_loadchannelregs(cs); 934 } 935 936 break; 937 938 default: 939 error = EPASSTHROUGH; 940 break; 941 } 942 943 simple_unlock(&cs->cs_lock); 944 splx(s); 945 946 return (error); 947 } 948 949 /* 950 * Start or restart transmission. 951 */ 952 static void 953 zsstart(tp) 954 struct tty *tp; 955 { 956 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(tp->t_dev)); 957 struct zs_chanstate *cs = zst->zst_cs; 958 int s; 959 960 s = spltty(); 961 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 962 goto out; 963 if (zst->zst_tx_stopped) 964 goto out; 965 966 if (tp->t_outq.c_cc <= tp->t_lowat) { 967 if (ISSET(tp->t_state, TS_ASLEEP)) { 968 CLR(tp->t_state, TS_ASLEEP); 969 wakeup((caddr_t)&tp->t_outq); 970 } 971 selwakeup(&tp->t_wsel); 972 if (tp->t_outq.c_cc == 0) 973 goto out; 974 } 975 976 /* Grab the first contiguous region of buffer space. */ 977 { 978 u_char *tba; 979 int tbc; 980 981 tba = tp->t_outq.c_cf; 982 tbc = ndqb(&tp->t_outq, 0); 983 984 (void) splzs(); 985 simple_lock(&cs->cs_lock); 986 987 zst->zst_tba = tba; 988 zst->zst_tbc = tbc; 989 } 990 991 SET(tp->t_state, TS_BUSY); 992 zst->zst_tx_busy = 1; 993 994 /* Enable transmit completion interrupts if necessary. */ 995 if (!ISSET(cs->cs_preg[1], ZSWR1_TIE)) { 996 SET(cs->cs_preg[1], ZSWR1_TIE); 997 cs->cs_creg[1] = cs->cs_preg[1]; 998 zs_write_reg(cs, 1, cs->cs_creg[1]); 999 } 1000 1001 /* Output the first character of the contiguous buffer. */ 1002 { 1003 zs_write_data(cs, *zst->zst_tba); 1004 zst->zst_tbc--; 1005 zst->zst_tba++; 1006 } 1007 simple_unlock(&cs->cs_lock); 1008 out: 1009 splx(s); 1010 return; 1011 } 1012 1013 /* 1014 * Stop output, e.g., for ^S or output flush. 1015 */ 1016 void 1017 zsstop(tp, flag) 1018 struct tty *tp; 1019 int flag; 1020 { 1021 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(tp->t_dev)); 1022 int s; 1023 1024 s = splzs(); 1025 if (ISSET(tp->t_state, TS_BUSY)) { 1026 /* Stop transmitting at the next chunk. */ 1027 zst->zst_tbc = 0; 1028 zst->zst_heldtbc = 0; 1029 if (!ISSET(tp->t_state, TS_TTSTOP)) 1030 SET(tp->t_state, TS_FLUSH); 1031 } 1032 splx(s); 1033 } 1034 1035 /* 1036 * Set ZS tty parameters from termios. 1037 * XXX - Should just copy the whole termios after 1038 * making sure all the changes could be done. 1039 */ 1040 static int 1041 zsparam(tp, t) 1042 struct tty *tp; 1043 struct termios *t; 1044 { 1045 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(tp->t_dev)); 1046 struct zs_chanstate *cs = zst->zst_cs; 1047 int ospeed; 1048 tcflag_t cflag; 1049 u_char tmp3, tmp4, tmp5; 1050 int s, error; 1051 1052 ospeed = t->c_ospeed; 1053 cflag = t->c_cflag; 1054 1055 /* Check requested parameters. */ 1056 if (ospeed < 0) 1057 return (EINVAL); 1058 if (t->c_ispeed && t->c_ispeed != ospeed) 1059 return (EINVAL); 1060 1061 /* 1062 * For the console, always force CLOCAL and !HUPCL, so that the port 1063 * is always active. 1064 */ 1065 if (ISSET(zst->zst_swflags, TIOCFLAG_SOFTCAR) || 1066 ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 1067 SET(cflag, CLOCAL); 1068 CLR(cflag, HUPCL); 1069 } 1070 1071 /* 1072 * Only whack the UART when params change. 1073 * Some callers need to clear tp->t_ospeed 1074 * to make sure initialization gets done. 1075 */ 1076 if (tp->t_ospeed == ospeed && 1077 tp->t_cflag == cflag) 1078 return (0); 1079 1080 /* 1081 * Call MD functions to deal with changed 1082 * clock modes or H/W flow control modes. 1083 * The BRG divisor is set now. (reg 12,13) 1084 */ 1085 error = zs_set_speed(cs, ospeed); 1086 if (error) 1087 return (error); 1088 error = zs_set_modes(cs, cflag); 1089 if (error) 1090 return (error); 1091 1092 /* 1093 * Block interrupts so that state will not 1094 * be altered until we are done setting it up. 1095 * 1096 * Initial values in cs_preg are set before 1097 * our attach routine is called. The master 1098 * interrupt enable is handled by zsc.c 1099 * 1100 */ 1101 s = splzs(); 1102 simple_lock(&cs->cs_lock); 1103 1104 /* 1105 * Recalculate which status ints to enable. 1106 */ 1107 zs_maskintr(zst); 1108 1109 /* Recompute character size bits. */ 1110 tmp3 = cs->cs_preg[3]; 1111 tmp5 = cs->cs_preg[5]; 1112 CLR(tmp3, ZSWR3_RXSIZE); 1113 CLR(tmp5, ZSWR5_TXSIZE); 1114 switch (ISSET(cflag, CSIZE)) { 1115 case CS5: 1116 SET(tmp3, ZSWR3_RX_5); 1117 SET(tmp5, ZSWR5_TX_5); 1118 break; 1119 case CS6: 1120 SET(tmp3, ZSWR3_RX_6); 1121 SET(tmp5, ZSWR5_TX_6); 1122 break; 1123 case CS7: 1124 SET(tmp3, ZSWR3_RX_7); 1125 SET(tmp5, ZSWR5_TX_7); 1126 break; 1127 case CS8: 1128 SET(tmp3, ZSWR3_RX_8); 1129 SET(tmp5, ZSWR5_TX_8); 1130 break; 1131 } 1132 cs->cs_preg[3] = tmp3; 1133 cs->cs_preg[5] = tmp5; 1134 1135 /* 1136 * Recompute the stop bits and parity bits. Note that 1137 * zs_set_speed() may have set clock selection bits etc. 1138 * in wr4, so those must preserved. 1139 */ 1140 tmp4 = cs->cs_preg[4]; 1141 CLR(tmp4, ZSWR4_SBMASK | ZSWR4_PARMASK); 1142 if (ISSET(cflag, CSTOPB)) 1143 SET(tmp4, ZSWR4_TWOSB); 1144 else 1145 SET(tmp4, ZSWR4_ONESB); 1146 if (!ISSET(cflag, PARODD)) 1147 SET(tmp4, ZSWR4_EVENP); 1148 if (ISSET(cflag, PARENB)) 1149 SET(tmp4, ZSWR4_PARENB); 1150 cs->cs_preg[4] = tmp4; 1151 1152 /* And copy to tty. */ 1153 tp->t_ispeed = 0; 1154 tp->t_ospeed = ospeed; 1155 tp->t_cflag = cflag; 1156 1157 /* 1158 * If nothing is being transmitted, set up new current values, 1159 * else mark them as pending. 1160 */ 1161 if (!cs->cs_heldchange) { 1162 if (zst->zst_tx_busy) { 1163 zst->zst_heldtbc = zst->zst_tbc; 1164 zst->zst_tbc = 0; 1165 cs->cs_heldchange = 1; 1166 } else 1167 zs_loadchannelregs(cs); 1168 } 1169 1170 /* 1171 * If hardware flow control is disabled, turn off the buffer water 1172 * marks and unblock any soft flow control state. Otherwise, enable 1173 * the water marks. 1174 */ 1175 if (!ISSET(cflag, CHWFLOW)) { 1176 zst->zst_r_hiwat = 0; 1177 zst->zst_r_lowat = 0; 1178 if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1179 CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1180 zst->zst_rx_ready = 1; 1181 cs->cs_softreq = 1; 1182 } 1183 if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 1184 CLR(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 1185 zs_hwiflow(zst); 1186 } 1187 } else { 1188 zst->zst_r_hiwat = zstty_rbuf_hiwat; 1189 zst->zst_r_lowat = zstty_rbuf_lowat; 1190 } 1191 1192 /* 1193 * Force a recheck of the hardware carrier and flow control status, 1194 * since we may have changed which bits we're looking at. 1195 */ 1196 zstty_stint(cs, 1); 1197 1198 simple_unlock(&cs->cs_lock); 1199 splx(s); 1200 1201 /* 1202 * If hardware flow control is disabled, unblock any hard flow control 1203 * state. 1204 */ 1205 if (!ISSET(cflag, CHWFLOW)) { 1206 if (zst->zst_tx_stopped) { 1207 zst->zst_tx_stopped = 0; 1208 zsstart(tp); 1209 } 1210 } 1211 1212 zstty_softint(cs); 1213 1214 return (0); 1215 } 1216 1217 /* 1218 * Compute interrupt enable bits and set in the pending bits. Called both 1219 * in zsparam() and when PPS (pulse per second timing) state changes. 1220 * Must be called at splzs(). 1221 */ 1222 static void 1223 zs_maskintr(zst) 1224 struct zstty_softc *zst; 1225 { 1226 struct zs_chanstate *cs = zst->zst_cs; 1227 int tmp15; 1228 1229 cs->cs_rr0_mask = cs->cs_rr0_cts | cs->cs_rr0_dcd; 1230 if (zst->zst_ppsmask != 0) 1231 cs->cs_rr0_mask |= cs->cs_rr0_pps; 1232 tmp15 = cs->cs_preg[15]; 1233 if (ISSET(cs->cs_rr0_mask, ZSRR0_DCD)) 1234 SET(tmp15, ZSWR15_DCD_IE); 1235 else 1236 CLR(tmp15, ZSWR15_DCD_IE); 1237 if (ISSET(cs->cs_rr0_mask, ZSRR0_CTS)) 1238 SET(tmp15, ZSWR15_CTS_IE); 1239 else 1240 CLR(tmp15, ZSWR15_CTS_IE); 1241 cs->cs_preg[15] = tmp15; 1242 } 1243 1244 1245 /* 1246 * Raise or lower modem control (DTR/RTS) signals. If a character is 1247 * in transmission, the change is deferred. 1248 * Called at splzs() and with the channel lock held. 1249 */ 1250 static void 1251 zs_modem(zst, onoff) 1252 struct zstty_softc *zst; 1253 int onoff; 1254 { 1255 struct zs_chanstate *cs = zst->zst_cs, *ccs; 1256 1257 if (cs->cs_wr5_dtr == 0) 1258 return; 1259 1260 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs); 1261 1262 if (onoff) 1263 SET(ccs->cs_preg[5], cs->cs_wr5_dtr); 1264 else 1265 CLR(ccs->cs_preg[5], cs->cs_wr5_dtr); 1266 1267 if (!cs->cs_heldchange) { 1268 if (zst->zst_tx_busy) { 1269 zst->zst_heldtbc = zst->zst_tbc; 1270 zst->zst_tbc = 0; 1271 cs->cs_heldchange = 1; 1272 } else 1273 zs_loadchannelregs(cs); 1274 } 1275 } 1276 1277 /* 1278 * Set modem bits. 1279 * Called at splzs() and with the channel lock held. 1280 */ 1281 static void 1282 tiocm_to_zs(zst, how, ttybits) 1283 struct zstty_softc *zst; 1284 u_long how; 1285 int ttybits; 1286 { 1287 struct zs_chanstate *cs = zst->zst_cs, *ccs; 1288 u_char zsbits; 1289 1290 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs); 1291 1292 zsbits = 0; 1293 if (ISSET(ttybits, TIOCM_DTR)) 1294 SET(zsbits, ZSWR5_DTR); 1295 if (ISSET(ttybits, TIOCM_RTS)) 1296 SET(zsbits, ZSWR5_RTS); 1297 1298 switch (how) { 1299 case TIOCMBIC: 1300 CLR(ccs->cs_preg[5], zsbits); 1301 break; 1302 1303 case TIOCMBIS: 1304 SET(ccs->cs_preg[5], zsbits); 1305 break; 1306 1307 case TIOCMSET: 1308 CLR(ccs->cs_preg[5], ZSWR5_RTS | ZSWR5_DTR); 1309 SET(ccs->cs_preg[5], zsbits); 1310 break; 1311 } 1312 1313 if (!cs->cs_heldchange) { 1314 if (zst->zst_tx_busy) { 1315 zst->zst_heldtbc = zst->zst_tbc; 1316 zst->zst_tbc = 0; 1317 cs->cs_heldchange = 1; 1318 } else 1319 zs_loadchannelregs(cs); 1320 } 1321 } 1322 1323 /* 1324 * Get modem bits. 1325 * Called at splzs() and with the channel lock held. 1326 */ 1327 static int 1328 zs_to_tiocm(zst) 1329 struct zstty_softc *zst; 1330 { 1331 struct zs_chanstate *cs = zst->zst_cs, *ccs; 1332 u_char zsbits; 1333 int ttybits = 0; 1334 1335 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs); 1336 1337 zsbits = ccs->cs_preg[5]; 1338 if (ISSET(zsbits, ZSWR5_DTR)) 1339 SET(ttybits, TIOCM_DTR); 1340 if (ISSET(zsbits, ZSWR5_RTS)) 1341 SET(ttybits, TIOCM_RTS); 1342 1343 zsbits = cs->cs_rr0; 1344 if (ISSET(zsbits, ZSRR0_DCD)) 1345 SET(ttybits, TIOCM_CD); 1346 if (ISSET(zsbits, ZSRR0_CTS)) 1347 SET(ttybits, TIOCM_CTS); 1348 1349 return (ttybits); 1350 } 1351 1352 /* 1353 * Try to block or unblock input using hardware flow-control. 1354 * This is called by kern/tty.c if MDMBUF|CRTSCTS is set, and 1355 * if this function returns non-zero, the TS_TBLOCK flag will 1356 * be set or cleared according to the "block" arg passed. 1357 */ 1358 int 1359 zshwiflow(tp, block) 1360 struct tty *tp; 1361 int block; 1362 { 1363 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(tp->t_dev)); 1364 struct zs_chanstate *cs = zst->zst_cs; 1365 int s; 1366 1367 if (cs->cs_wr5_rts == 0) 1368 return (0); 1369 1370 s = splzs(); 1371 simple_lock(&cs->cs_lock); 1372 if (block) { 1373 if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1374 SET(zst->zst_rx_flags, RX_TTY_BLOCKED); 1375 zs_hwiflow(zst); 1376 } 1377 } else { 1378 if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1379 CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1380 zst->zst_rx_ready = 1; 1381 cs->cs_softreq = 1; 1382 } 1383 if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1384 CLR(zst->zst_rx_flags, RX_TTY_BLOCKED); 1385 zs_hwiflow(zst); 1386 } 1387 } 1388 simple_unlock(&cs->cs_lock); 1389 splx(s); 1390 return (1); 1391 } 1392 1393 /* 1394 * Internal version of zshwiflow 1395 * Called at splzs() and with the channel lock held. 1396 */ 1397 static void 1398 zs_hwiflow(zst) 1399 struct zstty_softc *zst; 1400 { 1401 struct zs_chanstate *cs = zst->zst_cs, *ccs; 1402 1403 if (cs->cs_wr5_rts == 0) 1404 return; 1405 1406 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs); 1407 1408 if (ISSET(zst->zst_rx_flags, RX_ANY_BLOCK)) { 1409 CLR(ccs->cs_preg[5], cs->cs_wr5_rts); 1410 CLR(ccs->cs_creg[5], cs->cs_wr5_rts); 1411 } else { 1412 SET(ccs->cs_preg[5], cs->cs_wr5_rts); 1413 SET(ccs->cs_creg[5], cs->cs_wr5_rts); 1414 } 1415 zs_write_reg(ccs, 5, ccs->cs_creg[5]); 1416 } 1417 1418 1419 /**************************************************************** 1420 * Interface to the lower layer (zscc) 1421 ****************************************************************/ 1422 1423 #define integrate static inline 1424 integrate void zstty_rxsoft __P((struct zstty_softc *, struct tty *)); 1425 integrate void zstty_txsoft __P((struct zstty_softc *, struct tty *)); 1426 integrate void zstty_stsoft __P((struct zstty_softc *, struct tty *)); 1427 static void zstty_diag __P((void *)); 1428 1429 /* 1430 * Receiver Ready interrupt. 1431 * Called at splzs() and with the channel lock held. 1432 */ 1433 static void 1434 zstty_rxint(cs) 1435 struct zs_chanstate *cs; 1436 { 1437 struct zstty_softc *zst = cs->cs_private; 1438 u_char *put, *end; 1439 u_int cc; 1440 u_char rr0, rr1, c; 1441 1442 end = zst->zst_ebuf; 1443 put = zst->zst_rbput; 1444 cc = zst->zst_rbavail; 1445 1446 while (cc > 0) { 1447 /* 1448 * First read the status, because reading the received char 1449 * destroys the status of this char. 1450 */ 1451 rr1 = zs_read_reg(cs, 1); 1452 c = zs_read_data(cs); 1453 1454 if (ISSET(rr1, ZSRR1_FE | ZSRR1_DO | ZSRR1_PE)) { 1455 /* Clear the receive error. */ 1456 zs_write_csr(cs, ZSWR0_RESET_ERRORS); 1457 } 1458 1459 cn_check_magic(zst->zst_tty->t_dev, c, zstty_cnm_state); 1460 put[0] = c; 1461 put[1] = rr1; 1462 put += 2; 1463 if (put >= end) 1464 put = zst->zst_rbuf; 1465 cc--; 1466 1467 rr0 = zs_read_csr(cs); 1468 if (!ISSET(rr0, ZSRR0_RX_READY)) 1469 break; 1470 } 1471 1472 /* 1473 * Current string of incoming characters ended because 1474 * no more data was available or we ran out of space. 1475 * Schedule a receive event if any data was received. 1476 * If we're out of space, turn off receive interrupts. 1477 */ 1478 zst->zst_rbput = put; 1479 zst->zst_rbavail = cc; 1480 if (!ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1481 zst->zst_rx_ready = 1; 1482 cs->cs_softreq = 1; 1483 } 1484 1485 /* 1486 * See if we are in danger of overflowing a buffer. If 1487 * so, use hardware flow control to ease the pressure. 1488 */ 1489 if (!ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED) && 1490 cc < zst->zst_r_hiwat) { 1491 SET(zst->zst_rx_flags, RX_IBUF_BLOCKED); 1492 zs_hwiflow(zst); 1493 } 1494 1495 /* 1496 * If we're out of space, disable receive interrupts 1497 * until the queue has drained a bit. 1498 */ 1499 if (!cc) { 1500 SET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED); 1501 CLR(cs->cs_preg[1], ZSWR1_RIE); 1502 cs->cs_creg[1] = cs->cs_preg[1]; 1503 zs_write_reg(cs, 1, cs->cs_creg[1]); 1504 } 1505 1506 #if 0 1507 printf("%xH%04d\n", zst->zst_rx_flags, zst->zst_rbavail); 1508 #endif 1509 } 1510 1511 /* 1512 * Transmitter Ready interrupt. 1513 * Called at splzs() and with the channel lock held. 1514 */ 1515 static void 1516 zstty_txint(cs) 1517 struct zs_chanstate *cs; 1518 { 1519 struct zstty_softc *zst = cs->cs_private; 1520 1521 /* 1522 * If we've delayed a parameter change, do it now, and restart 1523 * output. 1524 */ 1525 if (cs->cs_heldchange) { 1526 zs_loadchannelregs(cs); 1527 cs->cs_heldchange = 0; 1528 zst->zst_tbc = zst->zst_heldtbc; 1529 zst->zst_heldtbc = 0; 1530 } 1531 1532 /* Output the next character in the buffer, if any. */ 1533 if (zst->zst_tbc > 0) { 1534 zs_write_data(cs, *zst->zst_tba); 1535 zst->zst_tbc--; 1536 zst->zst_tba++; 1537 } else { 1538 /* Disable transmit completion interrupts if necessary. */ 1539 if (ISSET(cs->cs_preg[1], ZSWR1_TIE)) { 1540 CLR(cs->cs_preg[1], ZSWR1_TIE); 1541 cs->cs_creg[1] = cs->cs_preg[1]; 1542 zs_write_reg(cs, 1, cs->cs_creg[1]); 1543 } 1544 if (zst->zst_tx_busy) { 1545 zst->zst_tx_busy = 0; 1546 zst->zst_tx_done = 1; 1547 cs->cs_softreq = 1; 1548 } 1549 } 1550 } 1551 1552 /* 1553 * Status Change interrupt. 1554 * Called at splzs() and with the channel lock held. 1555 */ 1556 static void 1557 zstty_stint(cs, force) 1558 struct zs_chanstate *cs; 1559 int force; 1560 { 1561 struct zstty_softc *zst = cs->cs_private; 1562 u_char rr0, delta; 1563 1564 rr0 = zs_read_csr(cs); 1565 zs_write_csr(cs, ZSWR0_RESET_STATUS); 1566 1567 /* 1568 * Check here for console break, so that we can abort 1569 * even when interrupts are locking up the machine. 1570 */ 1571 if (ISSET(rr0, ZSRR0_BREAK)) 1572 cn_check_magic(zst->zst_tty->t_dev, CNC_BREAK, zstty_cnm_state); 1573 1574 if (!force) 1575 delta = rr0 ^ cs->cs_rr0; 1576 else 1577 delta = cs->cs_rr0_mask; 1578 cs->cs_rr0 = rr0; 1579 1580 if (ISSET(delta, cs->cs_rr0_mask)) { 1581 SET(cs->cs_rr0_delta, delta); 1582 1583 /* 1584 * Pulse-per-second clock signal on edge of DCD? 1585 */ 1586 if (ISSET(delta, zst->zst_ppsmask)) { 1587 struct timeval tv; 1588 if (ISSET(rr0, zst->zst_ppsmask) == zst->zst_ppsassert) { 1589 /* XXX nanotime() */ 1590 microtime(&tv); 1591 TIMEVAL_TO_TIMESPEC(&tv, 1592 &zst->ppsinfo.assert_timestamp); 1593 if (zst->ppsparam.mode & PPS_OFFSETASSERT) { 1594 timespecadd(&zst->ppsinfo.assert_timestamp, 1595 &zst->ppsparam.assert_offset, 1596 &zst->ppsinfo.assert_timestamp); 1597 } 1598 1599 #ifdef PPS_SYNC 1600 if (zst->ppsparam.mode & PPS_HARDPPSONASSERT) 1601 hardpps(&tv, tv.tv_usec); 1602 #endif 1603 zst->ppsinfo.assert_sequence++; 1604 zst->ppsinfo.current_mode = zst->ppsparam.mode; 1605 } else if (ISSET(rr0, zst->zst_ppsmask) == 1606 zst->zst_ppsclear) { 1607 /* XXX nanotime() */ 1608 microtime(&tv); 1609 TIMEVAL_TO_TIMESPEC(&tv, 1610 &zst->ppsinfo.clear_timestamp); 1611 if (zst->ppsparam.mode & PPS_OFFSETCLEAR) { 1612 timespecadd(&zst->ppsinfo.clear_timestamp, 1613 &zst->ppsparam.clear_offset, 1614 &zst->ppsinfo.clear_timestamp); 1615 } 1616 1617 #ifdef PPS_SYNC 1618 if (zst->ppsparam.mode & PPS_HARDPPSONCLEAR) 1619 hardpps(&tv, tv.tv_usec); 1620 #endif 1621 zst->ppsinfo.clear_sequence++; 1622 zst->ppsinfo.current_mode = zst->ppsparam.mode; 1623 } 1624 } 1625 1626 /* 1627 * Stop output immediately if we lose the output 1628 * flow control signal or carrier detect. 1629 */ 1630 if (ISSET(~rr0, cs->cs_rr0_mask)) { 1631 zst->zst_tbc = 0; 1632 zst->zst_heldtbc = 0; 1633 } 1634 1635 zst->zst_st_check = 1; 1636 cs->cs_softreq = 1; 1637 } 1638 } 1639 1640 void 1641 zstty_diag(arg) 1642 void *arg; 1643 { 1644 struct zstty_softc *zst = arg; 1645 int overflows, floods; 1646 int s; 1647 1648 s = splzs(); 1649 overflows = zst->zst_overflows; 1650 zst->zst_overflows = 0; 1651 floods = zst->zst_floods; 1652 zst->zst_floods = 0; 1653 zst->zst_errors = 0; 1654 splx(s); 1655 1656 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1657 zst->zst_dev.dv_xname, 1658 overflows, overflows == 1 ? "" : "s", 1659 floods, floods == 1 ? "" : "s"); 1660 } 1661 1662 integrate void 1663 zstty_rxsoft(zst, tp) 1664 struct zstty_softc *zst; 1665 struct tty *tp; 1666 { 1667 struct zs_chanstate *cs = zst->zst_cs; 1668 int (*rint) __P((int c, struct tty *tp)) = tp->t_linesw->l_rint; 1669 u_char *get, *end; 1670 u_int cc, scc; 1671 u_char rr1; 1672 int code; 1673 int s; 1674 1675 end = zst->zst_ebuf; 1676 get = zst->zst_rbget; 1677 scc = cc = zstty_rbuf_size - zst->zst_rbavail; 1678 1679 if (cc == zstty_rbuf_size) { 1680 zst->zst_floods++; 1681 if (zst->zst_errors++ == 0) 1682 callout_reset(&zst->zst_diag_ch, 60 * hz, 1683 zstty_diag, zst); 1684 } 1685 1686 /* If not yet open, drop the entire buffer content here */ 1687 if (!ISSET(tp->t_state, TS_ISOPEN)) { 1688 get += cc << 1; 1689 if (get >= end) 1690 get -= zstty_rbuf_size << 1; 1691 cc = 0; 1692 } 1693 while (cc) { 1694 code = get[0]; 1695 rr1 = get[1]; 1696 if (ISSET(rr1, ZSRR1_DO | ZSRR1_FE | ZSRR1_PE)) { 1697 if (ISSET(rr1, ZSRR1_DO)) { 1698 zst->zst_overflows++; 1699 if (zst->zst_errors++ == 0) 1700 callout_reset(&zst->zst_diag_ch, 1701 60 * hz, zstty_diag, zst); 1702 } 1703 if (ISSET(rr1, ZSRR1_FE)) 1704 SET(code, TTY_FE); 1705 if (ISSET(rr1, ZSRR1_PE)) 1706 SET(code, TTY_PE); 1707 } 1708 if ((*rint)(code, tp) == -1) { 1709 /* 1710 * The line discipline's buffer is out of space. 1711 */ 1712 if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1713 /* 1714 * We're either not using flow control, or the 1715 * line discipline didn't tell us to block for 1716 * some reason. Either way, we have no way to 1717 * know when there's more space available, so 1718 * just drop the rest of the data. 1719 */ 1720 get += cc << 1; 1721 if (get >= end) 1722 get -= zstty_rbuf_size << 1; 1723 cc = 0; 1724 } else { 1725 /* 1726 * Don't schedule any more receive processing 1727 * until the line discipline tells us there's 1728 * space available (through comhwiflow()). 1729 * Leave the rest of the data in the input 1730 * buffer. 1731 */ 1732 SET(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1733 } 1734 break; 1735 } 1736 get += 2; 1737 if (get >= end) 1738 get = zst->zst_rbuf; 1739 cc--; 1740 } 1741 1742 if (cc != scc) { 1743 zst->zst_rbget = get; 1744 s = splzs(); 1745 simple_lock(&cs->cs_lock); 1746 cc = zst->zst_rbavail += scc - cc; 1747 /* Buffers should be ok again, release possible block. */ 1748 if (cc >= zst->zst_r_lowat) { 1749 if (ISSET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED)) { 1750 CLR(zst->zst_rx_flags, RX_IBUF_OVERFLOWED); 1751 SET(cs->cs_preg[1], ZSWR1_RIE); 1752 cs->cs_creg[1] = cs->cs_preg[1]; 1753 zs_write_reg(cs, 1, cs->cs_creg[1]); 1754 } 1755 if (ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED)) { 1756 CLR(zst->zst_rx_flags, RX_IBUF_BLOCKED); 1757 zs_hwiflow(zst); 1758 } 1759 } 1760 simple_unlock(&cs->cs_lock); 1761 splx(s); 1762 } 1763 1764 #if 0 1765 printf("%xS%04d\n", zst->zst_rx_flags, zst->zst_rbavail); 1766 #endif 1767 } 1768 1769 integrate void 1770 zstty_txsoft(zst, tp) 1771 struct zstty_softc *zst; 1772 struct tty *tp; 1773 { 1774 struct zs_chanstate *cs = zst->zst_cs; 1775 int s; 1776 1777 s = splzs(); 1778 simple_lock(&cs->cs_lock); 1779 CLR(tp->t_state, TS_BUSY); 1780 if (ISSET(tp->t_state, TS_FLUSH)) 1781 CLR(tp->t_state, TS_FLUSH); 1782 else 1783 ndflush(&tp->t_outq, (int)(zst->zst_tba - tp->t_outq.c_cf)); 1784 simple_unlock(&cs->cs_lock); 1785 splx(s); 1786 (*tp->t_linesw->l_start)(tp); 1787 } 1788 1789 integrate void 1790 zstty_stsoft(zst, tp) 1791 struct zstty_softc *zst; 1792 struct tty *tp; 1793 { 1794 struct zs_chanstate *cs = zst->zst_cs; 1795 u_char rr0, delta; 1796 int s; 1797 1798 s = splzs(); 1799 simple_lock(&cs->cs_lock); 1800 rr0 = cs->cs_rr0; 1801 delta = cs->cs_rr0_delta; 1802 cs->cs_rr0_delta = 0; 1803 simple_unlock(&cs->cs_lock); 1804 splx(s); 1805 1806 if (ISSET(delta, cs->cs_rr0_dcd)) { 1807 /* 1808 * Inform the tty layer that carrier detect changed. 1809 */ 1810 (void) (*tp->t_linesw->l_modem)(tp, ISSET(rr0, ZSRR0_DCD)); 1811 } 1812 1813 if (ISSET(delta, cs->cs_rr0_cts)) { 1814 /* Block or unblock output according to flow control. */ 1815 if (ISSET(rr0, cs->cs_rr0_cts)) { 1816 zst->zst_tx_stopped = 0; 1817 (*tp->t_linesw->l_start)(tp); 1818 } else { 1819 zst->zst_tx_stopped = 1; 1820 } 1821 } 1822 } 1823 1824 /* 1825 * Software interrupt. Called at zssoft 1826 * 1827 * The main job to be done here is to empty the input ring 1828 * by passing its contents up to the tty layer. The ring is 1829 * always emptied during this operation, therefore the ring 1830 * must not be larger than the space after "high water" in 1831 * the tty layer, or the tty layer might drop our input. 1832 * 1833 * Note: an "input blockage" condition is assumed to exist if 1834 * EITHER the TS_TBLOCK flag or zst_rx_blocked flag is set. 1835 */ 1836 static void 1837 zstty_softint(cs) 1838 struct zs_chanstate *cs; 1839 { 1840 struct zstty_softc *zst = cs->cs_private; 1841 struct tty *tp = zst->zst_tty; 1842 int s; 1843 1844 s = spltty(); 1845 1846 if (zst->zst_rx_ready) { 1847 zst->zst_rx_ready = 0; 1848 zstty_rxsoft(zst, tp); 1849 } 1850 1851 if (zst->zst_st_check) { 1852 zst->zst_st_check = 0; 1853 zstty_stsoft(zst, tp); 1854 } 1855 1856 if (zst->zst_tx_done) { 1857 zst->zst_tx_done = 0; 1858 zstty_txsoft(zst, tp); 1859 } 1860 1861 splx(s); 1862 } 1863 1864 struct zsops zsops_tty = { 1865 zstty_rxint, /* receive char available */ 1866 zstty_stint, /* external/status */ 1867 zstty_txint, /* xmit buffer empty */ 1868 zstty_softint, /* process software interrupt */ 1869 }; 1870
Indexes created Mon Sep 29 21:09:56 GMT 2025