z8530tty.c revision 1.65
1 /* $NetBSD: z8530tty.c,v 1.65 2000/03/23 07:01:34 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 1993, 1994, 1995, 1996, 1997, 1998, 1999 5 * Charles M. Hannum. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by Charles M. Hannum. 18 * 4. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 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/param.h> 102 #include <sys/systm.h> 103 #include <sys/proc.h> 104 #include <sys/device.h> 105 #include <sys/conf.h> 106 #include <sys/file.h> 107 #include <sys/ioctl.h> 108 #include <sys/malloc.h> 109 #include <sys/timepps.h> 110 #include <sys/tty.h> 111 #include <sys/time.h> 112 #include <sys/kernel.h> 113 #include <sys/syslog.h> 114 115 #include <dev/ic/z8530reg.h> 116 #include <machine/z8530var.h> 117 118 #include <dev/cons.h> 119 120 #include "locators.h" 121 122 /* 123 * How many input characters we can buffer. 124 * The port-specific var.h may override this. 125 * Note: must be a power of two! 126 */ 127 #ifndef ZSTTY_RING_SIZE 128 #define ZSTTY_RING_SIZE 2048 129 #endif 130 131 /* 132 * Make this an option variable one can patch. 133 * But be warned: this must be a power of 2! 134 */ 135 u_int zstty_rbuf_size = ZSTTY_RING_SIZE; 136 137 /* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */ 138 u_int zstty_rbuf_hiwat = (ZSTTY_RING_SIZE * 1) / 4; 139 u_int zstty_rbuf_lowat = (ZSTTY_RING_SIZE * 3) / 4; 140 141 static int zsppscap = 142 PPS_TSFMT_TSPEC | 143 PPS_CAPTUREASSERT | 144 PPS_CAPTURECLEAR | 145 #ifdef PPS_SYNC 146 PPS_HARDPPSONASSERT | PPS_HARDPPSONCLEAR | 147 #endif /* PPS_SYNC */ 148 PPS_OFFSETASSERT | PPS_OFFSETCLEAR; 149 150 struct zstty_softc { 151 struct device zst_dev; /* required first: base device */ 152 struct tty *zst_tty; 153 struct zs_chanstate *zst_cs; 154 155 struct callout zst_diag_ch; 156 157 u_int zst_overflows, 158 zst_floods, 159 zst_errors; 160 161 int zst_hwflags, /* see z8530var.h */ 162 zst_swflags; /* TIOCFLAG_SOFTCAR, ... <ttycom.h> */ 163 164 u_int zst_r_hiwat, 165 zst_r_lowat; 166 u_char *volatile zst_rbget, 167 *volatile zst_rbput; 168 volatile u_int zst_rbavail; 169 u_char *zst_rbuf, 170 *zst_ebuf; 171 172 /* 173 * The transmit byte count and address are used for pseudo-DMA 174 * output in the hardware interrupt code. PDMA can be suspended 175 * to get pending changes done; heldtbc is used for this. It can 176 * also be stopped for ^S; this sets TS_TTSTOP in tp->t_state. 177 */ 178 u_char *zst_tba; /* transmit buffer address */ 179 u_int zst_tbc, /* transmit byte count */ 180 zst_heldtbc; /* held tbc while xmission stopped */ 181 182 /* Flags to communicate with zstty_softint() */ 183 volatile u_char zst_rx_flags, /* receiver blocked */ 184 #define RX_TTY_BLOCKED 0x01 185 #define RX_TTY_OVERFLOWED 0x02 186 #define RX_IBUF_BLOCKED 0x04 187 #define RX_IBUF_OVERFLOWED 0x08 188 #define RX_ANY_BLOCK 0x0f 189 zst_tx_busy, /* working on an output chunk */ 190 zst_tx_done, /* done with one output chunk */ 191 zst_tx_stopped, /* H/W level stop (lost CTS) */ 192 zst_st_check, /* got a status interrupt */ 193 zst_rx_ready; 194 195 /* PPS signal on DCD, with or without inkernel clock disciplining */ 196 u_char zst_ppsmask; /* pps signal mask */ 197 u_char zst_ppsassert; /* pps leading edge */ 198 u_char zst_ppsclear; /* pps trailing edge */ 199 pps_info_t ppsinfo; 200 pps_params_t ppsparam; 201 }; 202 203 /* Macros to clear/set/test flags. */ 204 #define SET(t, f) (t) |= (f) 205 #define CLR(t, f) (t) &= ~(f) 206 #define ISSET(t, f) ((t) & (f)) 207 208 /* Definition of the driver for autoconfig. */ 209 static int zstty_match(struct device *, struct cfdata *, void *); 210 static void zstty_attach(struct device *, struct device *, void *); 211 212 struct cfattach zstty_ca = { 213 sizeof(struct zstty_softc), zstty_match, zstty_attach 214 }; 215 216 extern struct cfdriver zstty_cd; 217 218 struct zsops zsops_tty; 219 220 /* Routines called from other code. */ 221 cdev_decl(zs); /* open, close, read, write, ioctl, stop, ... */ 222 223 static void zs_shutdown __P((struct zstty_softc *)); 224 static void zsstart __P((struct tty *)); 225 static int zsparam __P((struct tty *, struct termios *)); 226 static void zs_modem __P((struct zstty_softc *, int)); 227 static void tiocm_to_zs __P((struct zstty_softc *, int, int)); 228 static int zs_to_tiocm __P((struct zstty_softc *)); 229 static int zshwiflow __P((struct tty *, int)); 230 static void zs_hwiflow __P((struct zstty_softc *)); 231 static void zs_maskintr __P((struct zstty_softc *)); 232 233 /* Low-level routines. */ 234 static void zstty_rxint __P((struct zs_chanstate *)); 235 static void zstty_stint __P((struct zs_chanstate *, int)); 236 static void zstty_txint __P((struct zs_chanstate *)); 237 static void zstty_softint __P((struct zs_chanstate *)); 238 239 #define ZSUNIT(x) (minor(x) & 0x7ffff) 240 #define ZSDIALOUT(x) (minor(x) & 0x80000) 241 242 /* 243 * zstty_match: how is this zs channel configured? 244 */ 245 int 246 zstty_match(parent, cf, aux) 247 struct device *parent; 248 struct cfdata *cf; 249 void *aux; 250 { 251 struct zsc_attach_args *args = aux; 252 253 /* Exact match is better than wildcard. */ 254 if (cf->cf_loc[ZSCCF_CHANNEL] == args->channel) 255 return 2; 256 257 /* This driver accepts wildcard. */ 258 if (cf->cf_loc[ZSCCF_CHANNEL] == ZSCCF_CHANNEL_DEFAULT) 259 return 1; 260 261 return 0; 262 } 263 264 void 265 zstty_attach(parent, self, aux) 266 struct device *parent, *self; 267 void *aux; 268 269 { 270 struct zsc_softc *zsc = (void *) parent; 271 struct zstty_softc *zst = (void *) self; 272 struct cfdata *cf = self->dv_cfdata; 273 struct zsc_attach_args *args = aux; 274 struct zs_chanstate *cs; 275 struct tty *tp; 276 int channel, s, tty_unit; 277 dev_t dev; 278 char *i, *o; 279 280 callout_init(&zst->zst_diag_ch); 281 282 tty_unit = zst->zst_dev.dv_unit; 283 channel = args->channel; 284 cs = zsc->zsc_cs[channel]; 285 cs->cs_private = zst; 286 cs->cs_ops = &zsops_tty; 287 288 zst->zst_cs = cs; 289 zst->zst_swflags = cf->cf_flags; /* softcar, etc. */ 290 zst->zst_hwflags = args->hwflags; 291 dev = makedev(zs_major, tty_unit); 292 293 if (zst->zst_swflags) 294 printf(" flags 0x%x", zst->zst_swflags); 295 296 /* 297 * Check whether we serve as a console device. 298 * XXX - split console input/output channels aren't 299 * supported yet on /dev/console 300 */ 301 i = o = NULL; 302 if ((zst->zst_hwflags & ZS_HWFLAG_CONSOLE_INPUT) != 0) { 303 i = "input"; 304 if ((args->hwflags & ZS_HWFLAG_USE_CONSDEV) != 0) { 305 cn_tab->cn_pollc = args->consdev->cn_pollc; 306 cn_tab->cn_getc = args->consdev->cn_getc; 307 } 308 cn_tab->cn_dev = dev; 309 } 310 if ((zst->zst_hwflags & ZS_HWFLAG_CONSOLE_OUTPUT) != 0) { 311 o = "output"; 312 if ((args->hwflags & ZS_HWFLAG_USE_CONSDEV) != 0) { 313 cn_tab->cn_putc = args->consdev->cn_putc; 314 } 315 cn_tab->cn_dev = dev; 316 } 317 if (i != NULL || o != NULL) 318 printf(" (console %s)", i ? (o ? "i/o" : i) : o); 319 320 #ifdef KGDB 321 if (zs_check_kgdb(cs, dev)) { 322 /* 323 * Allow kgdb to "take over" this port. Returns true 324 * if this serial port is in-use by kgdb. 325 */ 326 printf(" (kgdb)"); 327 /* 328 * This is the kgdb port (exclusive use) 329 * so skip the normal attach code. 330 */ 331 return; 332 } 333 #endif 334 printf("\n"); 335 336 tp = ttymalloc(); 337 tp->t_dev = dev; 338 tp->t_oproc = zsstart; 339 tp->t_param = zsparam; 340 tp->t_hwiflow = zshwiflow; 341 tty_attach(tp); 342 343 zst->zst_tty = tp; 344 zst->zst_rbuf = malloc(zstty_rbuf_size << 1, M_DEVBUF, M_WAITOK); 345 zst->zst_ebuf = zst->zst_rbuf + (zstty_rbuf_size << 1); 346 /* Disable the high water mark. */ 347 zst->zst_r_hiwat = 0; 348 zst->zst_r_lowat = 0; 349 zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf; 350 zst->zst_rbavail = zstty_rbuf_size; 351 352 /* if there are no enable/disable functions, assume the device 353 is always enabled */ 354 if (!cs->enable) 355 cs->enabled = 1; 356 357 /* 358 * Hardware init 359 */ 360 if (ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 361 /* Call zsparam similar to open. */ 362 struct termios t; 363 364 /* Setup the "new" parameters in t. */ 365 t.c_ispeed = 0; 366 t.c_ospeed = cs->cs_defspeed; 367 t.c_cflag = cs->cs_defcflag; 368 369 s = splzs(); 370 371 /* 372 * Turn on receiver and status interrupts. 373 * We defer the actual write of the register to zsparam(), 374 * but we must make sure status interrupts are turned on by 375 * the time zsparam() reads the initial rr0 state. 376 */ 377 SET(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE); 378 379 splx(s); 380 381 /* Make sure zsparam will see changes. */ 382 tp->t_ospeed = 0; 383 (void) zsparam(tp, &t); 384 385 s = splzs(); 386 387 /* Make sure DTR is on now. */ 388 zs_modem(zst, 1); 389 390 splx(s); 391 } else { 392 /* Not the console; may need reset. */ 393 int reset; 394 395 reset = (channel == 0) ? ZSWR9_A_RESET : ZSWR9_B_RESET; 396 397 s = splzs(); 398 399 zs_write_reg(cs, 9, reset); 400 401 /* Will raise DTR in open. */ 402 zs_modem(zst, 0); 403 404 splx(s); 405 } 406 } 407 408 409 /* 410 * Return pointer to our tty. 411 */ 412 struct tty * 413 zstty(dev) 414 dev_t dev; 415 { 416 struct zstty_softc *zst; 417 int unit = ZSUNIT(dev); 418 419 #ifdef DIAGNOSTIC 420 if (unit >= zstty_cd.cd_ndevs) 421 panic("zstty"); 422 #endif 423 zst = zstty_cd.cd_devs[unit]; 424 return (zst->zst_tty); 425 } 426 427 428 void 429 zs_shutdown(zst) 430 struct zstty_softc *zst; 431 { 432 struct zs_chanstate *cs = zst->zst_cs; 433 struct tty *tp = zst->zst_tty; 434 int s; 435 436 s = splzs(); 437 438 /* If we were asserting flow control, then deassert it. */ 439 SET(zst->zst_rx_flags, RX_IBUF_BLOCKED); 440 zs_hwiflow(zst); 441 442 /* Clear any break condition set with TIOCSBRK. */ 443 zs_break(cs, 0); 444 445 /* Turn off PPS capture on last close. */ 446 zst->zst_ppsmask = 0; 447 zst->ppsparam.mode = 0; 448 449 /* 450 * Hang up if necessary. Wait a bit, so the other side has time to 451 * notice even if we immediately open the port again. 452 */ 453 if (ISSET(tp->t_cflag, HUPCL)) { 454 zs_modem(zst, 0); 455 (void) tsleep(cs, TTIPRI, ttclos, hz); 456 } 457 458 /* Turn off interrupts if not the console. */ 459 if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 460 CLR(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE); 461 cs->cs_creg[1] = cs->cs_preg[1]; 462 zs_write_reg(cs, 1, cs->cs_creg[1]); 463 } 464 465 /* Call the power management hook. */ 466 if (cs->disable) { 467 #ifdef DIAGNOSTIC 468 if (!cs->enabled) 469 panic("zs_shutdown: not enabled?"); 470 #endif 471 (*cs->disable)(zst->zst_cs); 472 } 473 474 splx(s); 475 } 476 477 /* 478 * Open a zs serial (tty) port. 479 */ 480 int 481 zsopen(dev, flags, mode, p) 482 dev_t dev; 483 int flags; 484 int mode; 485 struct proc *p; 486 { 487 int unit = ZSUNIT(dev); 488 struct zstty_softc *zst; 489 struct zs_chanstate *cs; 490 struct tty *tp; 491 int s, s2; 492 int error; 493 494 if (unit >= zstty_cd.cd_ndevs) 495 return (ENXIO); 496 zst = zstty_cd.cd_devs[unit]; 497 if (zst == 0) 498 return (ENXIO); 499 tp = zst->zst_tty; 500 cs = zst->zst_cs; 501 502 /* If KGDB took the line, then tp==NULL */ 503 if (tp == NULL) 504 return (EBUSY); 505 506 if (ISSET(tp->t_state, TS_ISOPEN) && 507 ISSET(tp->t_state, TS_XCLUDE) && 508 p->p_ucred->cr_uid != 0) 509 return (EBUSY); 510 511 s = spltty(); 512 513 /* 514 * Do the following iff this is a first open. 515 */ 516 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 517 struct termios t; 518 519 tp->t_dev = dev; 520 521 /* Call the power management hook. */ 522 if (cs->enable) { 523 if ((*cs->enable)(cs)) { 524 splx(s2); 525 splx(s); 526 printf("%s: device enable failed\n", 527 zst->zst_dev.dv_xname); 528 return (EIO); 529 } 530 } 531 532 /* 533 * Initialize the termios status to the defaults. Add in the 534 * sticky bits from TIOCSFLAGS. 535 */ 536 t.c_ispeed = 0; 537 t.c_ospeed = cs->cs_defspeed; 538 t.c_cflag = cs->cs_defcflag; 539 if (ISSET(zst->zst_swflags, TIOCFLAG_CLOCAL)) 540 SET(t.c_cflag, CLOCAL); 541 if (ISSET(zst->zst_swflags, TIOCFLAG_CRTSCTS)) 542 SET(t.c_cflag, CRTSCTS); 543 if (ISSET(zst->zst_swflags, TIOCFLAG_CDTRCTS)) 544 SET(t.c_cflag, CDTRCTS); 545 if (ISSET(zst->zst_swflags, TIOCFLAG_MDMBUF)) 546 SET(t.c_cflag, MDMBUF); 547 548 s2 = splzs(); 549 550 /* 551 * Turn on receiver and status interrupts. 552 * We defer the actual write of the register to zsparam(), 553 * but we must make sure status interrupts are turned on by 554 * the time zsparam() reads the initial rr0 state. 555 */ 556 SET(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE); 557 558 /* Clear PPS capture state on first open. */ 559 zst->zst_ppsmask = 0; 560 zst->ppsparam.mode = 0; 561 562 splx(s2); 563 564 /* Make sure zsparam will see changes. */ 565 tp->t_ospeed = 0; 566 (void) zsparam(tp, &t); 567 568 /* 569 * Note: zsparam has done: cflag, ispeed, ospeed 570 * so we just need to do: iflag, oflag, lflag, cc 571 * For "raw" mode, just leave all zeros. 572 */ 573 if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_RAW)) { 574 tp->t_iflag = TTYDEF_IFLAG; 575 tp->t_oflag = TTYDEF_OFLAG; 576 tp->t_lflag = TTYDEF_LFLAG; 577 } else { 578 tp->t_iflag = 0; 579 tp->t_oflag = 0; 580 tp->t_lflag = 0; 581 } 582 ttychars(tp); 583 ttsetwater(tp); 584 585 s2 = splzs(); 586 587 /* 588 * Turn on DTR. We must always do this, even if carrier is not 589 * present, because otherwise we'd have to use TIOCSDTR 590 * immediately after setting CLOCAL, which applications do not 591 * expect. We always assert DTR while the device is open 592 * unless explicitly requested to deassert it. 593 */ 594 zs_modem(zst, 1); 595 596 /* Clear the input ring, and unblock. */ 597 zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf; 598 zst->zst_rbavail = zstty_rbuf_size; 599 zs_iflush(cs); 600 CLR(zst->zst_rx_flags, RX_ANY_BLOCK); 601 zs_hwiflow(zst); 602 603 splx(s2); 604 } 605 606 splx(s); 607 608 error = ttyopen(tp, ZSDIALOUT(dev), ISSET(flags, O_NONBLOCK)); 609 if (error) 610 goto bad; 611 612 error = (*linesw[tp->t_line].l_open)(dev, tp); 613 if (error) 614 goto bad; 615 616 return (0); 617 618 bad: 619 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 620 /* 621 * We failed to open the device, and nobody else had it opened. 622 * Clean up the state as appropriate. 623 */ 624 zs_shutdown(zst); 625 } 626 627 return (error); 628 } 629 630 /* 631 * Close a zs serial port. 632 */ 633 int 634 zsclose(dev, flags, mode, p) 635 dev_t dev; 636 int flags; 637 int mode; 638 struct proc *p; 639 { 640 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(dev)]; 641 struct tty *tp = zst->zst_tty; 642 643 /* XXX This is for cons.c. */ 644 if (!ISSET(tp->t_state, TS_ISOPEN)) 645 return 0; 646 647 (*linesw[tp->t_line].l_close)(tp, flags); 648 ttyclose(tp); 649 650 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 651 /* 652 * Although we got a last close, the device may still be in 653 * use; e.g. if this was the dialout node, and there are still 654 * processes waiting for carrier on the non-dialout node. 655 */ 656 zs_shutdown(zst); 657 } 658 659 return (0); 660 } 661 662 /* 663 * Read/write zs serial port. 664 */ 665 int 666 zsread(dev, uio, flags) 667 dev_t dev; 668 struct uio *uio; 669 int flags; 670 { 671 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(dev)]; 672 struct tty *tp = zst->zst_tty; 673 674 return ((*linesw[tp->t_line].l_read)(tp, uio, flags)); 675 } 676 677 int 678 zswrite(dev, uio, flags) 679 dev_t dev; 680 struct uio *uio; 681 int flags; 682 { 683 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(dev)]; 684 struct tty *tp = zst->zst_tty; 685 686 return ((*linesw[tp->t_line].l_write)(tp, uio, flags)); 687 } 688 689 int 690 zsioctl(dev, cmd, data, flag, p) 691 dev_t dev; 692 u_long cmd; 693 caddr_t data; 694 int flag; 695 struct proc *p; 696 { 697 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(dev)]; 698 struct zs_chanstate *cs = zst->zst_cs; 699 struct tty *tp = zst->zst_tty; 700 int error; 701 int s; 702 703 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); 704 if (error >= 0) 705 return (error); 706 707 error = ttioctl(tp, cmd, data, flag, p); 708 if (error >= 0) 709 return (error); 710 711 #ifdef ZS_MD_IOCTL 712 error = ZS_MD_IOCTL; 713 if (error >= 0) 714 return (error); 715 #endif /* ZS_MD_IOCTL */ 716 717 error = 0; 718 719 s = splzs(); 720 721 switch (cmd) { 722 case TIOCSBRK: 723 zs_break(cs, 1); 724 break; 725 726 case TIOCCBRK: 727 zs_break(cs, 0); 728 break; 729 730 case TIOCGFLAGS: 731 *(int *)data = zst->zst_swflags; 732 break; 733 734 case TIOCSFLAGS: 735 error = suser(p->p_ucred, &p->p_acflag); 736 if (error) 737 break; 738 zst->zst_swflags = *(int *)data; 739 break; 740 741 case TIOCSDTR: 742 zs_modem(zst, 1); 743 break; 744 745 case TIOCCDTR: 746 zs_modem(zst, 0); 747 break; 748 749 case TIOCMSET: 750 case TIOCMBIS: 751 case TIOCMBIC: 752 tiocm_to_zs(zst, cmd, *(int *)data); 753 break; 754 755 case TIOCMGET: 756 *(int *)data = zs_to_tiocm(zst); 757 break; 758 759 case PPS_IOC_CREATE: 760 break; 761 762 case PPS_IOC_DESTROY: 763 break; 764 765 case PPS_IOC_GETPARAMS: { 766 pps_params_t *pp; 767 pp = (pps_params_t *)data; 768 *pp = zst->ppsparam; 769 break; 770 } 771 772 case PPS_IOC_SETPARAMS: { 773 pps_params_t *pp; 774 int mode; 775 if (cs->cs_rr0_pps == 0) { 776 error = EINVAL; 777 break; 778 } 779 pp = (pps_params_t *)data; 780 if (pp->mode & ~zsppscap) { 781 error = EINVAL; 782 break; 783 } 784 zst->ppsparam = *pp; 785 /* 786 * compute masks from user-specified timestamp state. 787 */ 788 mode = zst->ppsparam.mode; 789 #ifdef PPS_SYNC 790 if (mode & PPS_HARDPPSONASSERT) { 791 mode |= PPS_CAPTUREASSERT; 792 /* XXX revoke any previous HARDPPS source */ 793 } 794 if (mode & PPS_HARDPPSONCLEAR) { 795 mode |= PPS_CAPTURECLEAR; 796 /* XXX revoke any previous HARDPPS source */ 797 } 798 #endif /* PPS_SYNC */ 799 switch (mode & PPS_CAPTUREBOTH) { 800 case 0: 801 zst->zst_ppsmask = 0; 802 break; 803 804 case PPS_CAPTUREASSERT: 805 zst->zst_ppsmask = ZSRR0_DCD; 806 zst->zst_ppsassert = ZSRR0_DCD; 807 zst->zst_ppsclear = -1; 808 break; 809 810 case PPS_CAPTURECLEAR: 811 zst->zst_ppsmask = ZSRR0_DCD; 812 zst->zst_ppsassert = -1; 813 zst->zst_ppsclear = 0; 814 break; 815 816 case PPS_CAPTUREBOTH: 817 zst->zst_ppsmask = ZSRR0_DCD; 818 zst->zst_ppsassert = ZSRR0_DCD; 819 zst->zst_ppsclear = 0; 820 break; 821 822 default: 823 error = EINVAL; 824 break; 825 } 826 827 /* 828 * Now update interrupts. 829 */ 830 zs_maskintr(zst); 831 /* 832 * If nothing is being transmitted, set up new current values, 833 * else mark them as pending. 834 */ 835 if (!cs->cs_heldchange) { 836 if (zst->zst_tx_busy) { 837 zst->zst_heldtbc = zst->zst_tbc; 838 zst->zst_tbc = 0; 839 cs->cs_heldchange = 1; 840 } else 841 zs_loadchannelregs(cs); 842 } 843 844 break; 845 } 846 847 case PPS_IOC_GETCAP: 848 *(int *)data = zsppscap; 849 break; 850 851 case PPS_IOC_FETCH: { 852 pps_info_t *pi; 853 pi = (pps_info_t *)data; 854 *pi = zst->ppsinfo; 855 break; 856 } 857 858 case TIOCDCDTIMESTAMP: /* XXX old, overloaded API used by xntpd v3 */ 859 if (cs->cs_rr0_pps == 0) { 860 error = EINVAL; 861 break; 862 } 863 /* 864 * Some GPS clocks models use the falling rather than 865 * rising edge as the on-the-second signal. 866 * The old API has no way to specify PPS polarity. 867 */ 868 zst->zst_ppsmask = ZSRR0_DCD; 869 #ifndef PPS_TRAILING_EDGE 870 zst->zst_ppsassert = ZSRR0_DCD; 871 zst->zst_ppsclear = -1; 872 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 873 &zst->ppsinfo.assert_timestamp); 874 #else 875 zst->zst_ppsassert = -1; 876 zst->zst_ppsclear = 01; 877 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 878 &zst->ppsinfo.clear_timestamp); 879 #endif 880 /* 881 * Now update interrupts. 882 */ 883 zs_maskintr(zst); 884 /* 885 * If nothing is being transmitted, set up new current values, 886 * else mark them as pending. 887 */ 888 if (!cs->cs_heldchange) { 889 if (zst->zst_tx_busy) { 890 zst->zst_heldtbc = zst->zst_tbc; 891 zst->zst_tbc = 0; 892 cs->cs_heldchange = 1; 893 } else 894 zs_loadchannelregs(cs); 895 } 896 897 break; 898 899 default: 900 error = ENOTTY; 901 break; 902 } 903 904 splx(s); 905 906 return (error); 907 } 908 909 /* 910 * Start or restart transmission. 911 */ 912 static void 913 zsstart(tp) 914 struct tty *tp; 915 { 916 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(tp->t_dev)]; 917 struct zs_chanstate *cs = zst->zst_cs; 918 int s; 919 920 s = spltty(); 921 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 922 goto out; 923 if (zst->zst_tx_stopped) 924 goto out; 925 926 if (tp->t_outq.c_cc <= tp->t_lowat) { 927 if (ISSET(tp->t_state, TS_ASLEEP)) { 928 CLR(tp->t_state, TS_ASLEEP); 929 wakeup((caddr_t)&tp->t_outq); 930 } 931 selwakeup(&tp->t_wsel); 932 if (tp->t_outq.c_cc == 0) 933 goto out; 934 } 935 936 /* Grab the first contiguous region of buffer space. */ 937 { 938 u_char *tba; 939 int tbc; 940 941 tba = tp->t_outq.c_cf; 942 tbc = ndqb(&tp->t_outq, 0); 943 944 (void) splzs(); 945 946 zst->zst_tba = tba; 947 zst->zst_tbc = tbc; 948 } 949 950 SET(tp->t_state, TS_BUSY); 951 zst->zst_tx_busy = 1; 952 953 /* Enable transmit completion interrupts if necessary. */ 954 if (!ISSET(cs->cs_preg[1], ZSWR1_TIE)) { 955 SET(cs->cs_preg[1], ZSWR1_TIE); 956 cs->cs_creg[1] = cs->cs_preg[1]; 957 zs_write_reg(cs, 1, cs->cs_creg[1]); 958 } 959 960 /* Output the first character of the contiguous buffer. */ 961 { 962 zs_write_data(cs, *zst->zst_tba); 963 zst->zst_tbc--; 964 zst->zst_tba++; 965 } 966 out: 967 splx(s); 968 return; 969 } 970 971 /* 972 * Stop output, e.g., for ^S or output flush. 973 */ 974 void 975 zsstop(tp, flag) 976 struct tty *tp; 977 int flag; 978 { 979 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(tp->t_dev)]; 980 int s; 981 982 s = splzs(); 983 if (ISSET(tp->t_state, TS_BUSY)) { 984 /* Stop transmitting at the next chunk. */ 985 zst->zst_tbc = 0; 986 zst->zst_heldtbc = 0; 987 if (!ISSET(tp->t_state, TS_TTSTOP)) 988 SET(tp->t_state, TS_FLUSH); 989 } 990 splx(s); 991 } 992 993 /* 994 * Set ZS tty parameters from termios. 995 * XXX - Should just copy the whole termios after 996 * making sure all the changes could be done. 997 */ 998 static int 999 zsparam(tp, t) 1000 struct tty *tp; 1001 struct termios *t; 1002 { 1003 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(tp->t_dev)]; 1004 struct zs_chanstate *cs = zst->zst_cs; 1005 int ospeed, cflag; 1006 u_char tmp3, tmp4, tmp5; 1007 int s, error; 1008 1009 ospeed = t->c_ospeed; 1010 cflag = t->c_cflag; 1011 1012 /* Check requested parameters. */ 1013 if (ospeed < 0) 1014 return (EINVAL); 1015 if (t->c_ispeed && t->c_ispeed != ospeed) 1016 return (EINVAL); 1017 1018 /* 1019 * For the console, always force CLOCAL and !HUPCL, so that the port 1020 * is always active. 1021 */ 1022 if (ISSET(zst->zst_swflags, TIOCFLAG_SOFTCAR) || 1023 ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 1024 SET(cflag, CLOCAL); 1025 CLR(cflag, HUPCL); 1026 } 1027 1028 /* 1029 * Only whack the UART when params change. 1030 * Some callers need to clear tp->t_ospeed 1031 * to make sure initialization gets done. 1032 */ 1033 if (tp->t_ospeed == ospeed && 1034 tp->t_cflag == cflag) 1035 return (0); 1036 1037 /* 1038 * Call MD functions to deal with changed 1039 * clock modes or H/W flow control modes. 1040 * The BRG divisor is set now. (reg 12,13) 1041 */ 1042 error = zs_set_speed(cs, ospeed); 1043 if (error) 1044 return (error); 1045 error = zs_set_modes(cs, cflag); 1046 if (error) 1047 return (error); 1048 1049 /* 1050 * Block interrupts so that state will not 1051 * be altered until we are done setting it up. 1052 * 1053 * Initial values in cs_preg are set before 1054 * our attach routine is called. The master 1055 * interrupt enable is handled by zsc.c 1056 * 1057 */ 1058 s = splzs(); 1059 1060 /* 1061 * Recalculate which status ints to enable. 1062 */ 1063 zs_maskintr(zst); 1064 1065 /* Recompute character size bits. */ 1066 tmp3 = cs->cs_preg[3]; 1067 tmp5 = cs->cs_preg[5]; 1068 CLR(tmp3, ZSWR3_RXSIZE); 1069 CLR(tmp5, ZSWR5_TXSIZE); 1070 switch (ISSET(cflag, CSIZE)) { 1071 case CS5: 1072 SET(tmp3, ZSWR3_RX_5); 1073 SET(tmp5, ZSWR5_TX_5); 1074 break; 1075 case CS6: 1076 SET(tmp3, ZSWR3_RX_6); 1077 SET(tmp5, ZSWR5_TX_6); 1078 break; 1079 case CS7: 1080 SET(tmp3, ZSWR3_RX_7); 1081 SET(tmp5, ZSWR5_TX_7); 1082 break; 1083 case CS8: 1084 SET(tmp3, ZSWR3_RX_8); 1085 SET(tmp5, ZSWR5_TX_8); 1086 break; 1087 } 1088 cs->cs_preg[3] = tmp3; 1089 cs->cs_preg[5] = tmp5; 1090 1091 /* 1092 * Recompute the stop bits and parity bits. Note that 1093 * zs_set_speed() may have set clock selection bits etc. 1094 * in wr4, so those must preserved. 1095 */ 1096 tmp4 = cs->cs_preg[4]; 1097 CLR(tmp4, ZSWR4_SBMASK | ZSWR4_PARMASK); 1098 if (ISSET(cflag, CSTOPB)) 1099 SET(tmp4, ZSWR4_TWOSB); 1100 else 1101 SET(tmp4, ZSWR4_ONESB); 1102 if (!ISSET(cflag, PARODD)) 1103 SET(tmp4, ZSWR4_EVENP); 1104 if (ISSET(cflag, PARENB)) 1105 SET(tmp4, ZSWR4_PARENB); 1106 cs->cs_preg[4] = tmp4; 1107 1108 /* And copy to tty. */ 1109 tp->t_ispeed = 0; 1110 tp->t_ospeed = ospeed; 1111 tp->t_cflag = cflag; 1112 1113 /* 1114 * If nothing is being transmitted, set up new current values, 1115 * else mark them as pending. 1116 */ 1117 if (!cs->cs_heldchange) { 1118 if (zst->zst_tx_busy) { 1119 zst->zst_heldtbc = zst->zst_tbc; 1120 zst->zst_tbc = 0; 1121 cs->cs_heldchange = 1; 1122 } else 1123 zs_loadchannelregs(cs); 1124 } 1125 1126 /* 1127 * If hardware flow control is disabled, turn off the buffer water 1128 * marks and unblock any soft flow control state. Otherwise, enable 1129 * the water marks. 1130 */ 1131 if (!ISSET(cflag, CHWFLOW)) { 1132 zst->zst_r_hiwat = 0; 1133 zst->zst_r_lowat = 0; 1134 if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1135 CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1136 zst->zst_rx_ready = 1; 1137 cs->cs_softreq = 1; 1138 } 1139 if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 1140 CLR(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 1141 zs_hwiflow(zst); 1142 } 1143 } else { 1144 zst->zst_r_hiwat = zstty_rbuf_hiwat; 1145 zst->zst_r_lowat = zstty_rbuf_lowat; 1146 } 1147 1148 /* 1149 * Force a recheck of the hardware carrier and flow control status, 1150 * since we may have changed which bits we're looking at. 1151 */ 1152 zstty_stint(cs, 1); 1153 1154 splx(s); 1155 1156 /* 1157 * If hardware flow control is disabled, unblock any hard flow control 1158 * state. 1159 */ 1160 if (!ISSET(cflag, CHWFLOW)) { 1161 if (zst->zst_tx_stopped) { 1162 zst->zst_tx_stopped = 0; 1163 zsstart(tp); 1164 } 1165 } 1166 1167 zstty_softint(cs); 1168 1169 return (0); 1170 } 1171 1172 /* 1173 * Compute interupt enable bits and set in the pending bits. Called both 1174 * in zsparam() and when PPS (pulse per second timing) state changes. 1175 * Must be called at splzs(). 1176 */ 1177 static void 1178 zs_maskintr(zst) 1179 struct zstty_softc *zst; 1180 { 1181 struct zs_chanstate *cs = zst->zst_cs; 1182 int tmp15; 1183 1184 cs->cs_rr0_mask = cs->cs_rr0_cts | cs->cs_rr0_dcd; 1185 if (zst->zst_ppsmask != 0) 1186 cs->cs_rr0_mask |= cs->cs_rr0_pps; 1187 tmp15 = cs->cs_preg[15]; 1188 if (ISSET(cs->cs_rr0_mask, ZSRR0_DCD)) 1189 SET(tmp15, ZSWR15_DCD_IE); 1190 else 1191 CLR(tmp15, ZSWR15_DCD_IE); 1192 if (ISSET(cs->cs_rr0_mask, ZSRR0_CTS)) 1193 SET(tmp15, ZSWR15_CTS_IE); 1194 else 1195 CLR(tmp15, ZSWR15_CTS_IE); 1196 cs->cs_preg[15] = tmp15; 1197 } 1198 1199 1200 /* 1201 * Raise or lower modem control (DTR/RTS) signals. If a character is 1202 * in transmission, the change is deferred. 1203 */ 1204 static void 1205 zs_modem(zst, onoff) 1206 struct zstty_softc *zst; 1207 int onoff; 1208 { 1209 struct zs_chanstate *cs = zst->zst_cs; 1210 1211 if (cs->cs_wr5_dtr == 0) 1212 return; 1213 1214 if (onoff) 1215 SET(cs->cs_preg[5], cs->cs_wr5_dtr); 1216 else 1217 CLR(cs->cs_preg[5], cs->cs_wr5_dtr); 1218 1219 if (!cs->cs_heldchange) { 1220 if (zst->zst_tx_busy) { 1221 zst->zst_heldtbc = zst->zst_tbc; 1222 zst->zst_tbc = 0; 1223 cs->cs_heldchange = 1; 1224 } else 1225 zs_loadchannelregs(cs); 1226 } 1227 } 1228 1229 static void 1230 tiocm_to_zs(zst, how, ttybits) 1231 struct zstty_softc *zst; 1232 int how, ttybits; 1233 { 1234 struct zs_chanstate *cs = zst->zst_cs; 1235 u_char zsbits; 1236 1237 zsbits = 0; 1238 if (ISSET(ttybits, TIOCM_DTR)) 1239 SET(zsbits, ZSWR5_DTR); 1240 if (ISSET(ttybits, TIOCM_RTS)) 1241 SET(zsbits, ZSWR5_RTS); 1242 1243 switch (how) { 1244 case TIOCMBIC: 1245 CLR(cs->cs_preg[5], zsbits); 1246 break; 1247 1248 case TIOCMBIS: 1249 SET(cs->cs_preg[5], zsbits); 1250 break; 1251 1252 case TIOCMSET: 1253 CLR(cs->cs_preg[5], ZSWR5_RTS | ZSWR5_DTR); 1254 SET(cs->cs_preg[5], zsbits); 1255 break; 1256 } 1257 1258 if (!cs->cs_heldchange) { 1259 if (zst->zst_tx_busy) { 1260 zst->zst_heldtbc = zst->zst_tbc; 1261 zst->zst_tbc = 0; 1262 cs->cs_heldchange = 1; 1263 } else 1264 zs_loadchannelregs(cs); 1265 } 1266 } 1267 1268 static int 1269 zs_to_tiocm(zst) 1270 struct zstty_softc *zst; 1271 { 1272 struct zs_chanstate *cs = zst->zst_cs; 1273 u_char zsbits; 1274 int ttybits = 0; 1275 1276 zsbits = cs->cs_preg[5]; 1277 if (ISSET(zsbits, ZSWR5_DTR)) 1278 SET(ttybits, TIOCM_DTR); 1279 if (ISSET(zsbits, ZSWR5_RTS)) 1280 SET(ttybits, TIOCM_RTS); 1281 1282 zsbits = cs->cs_rr0; 1283 if (ISSET(zsbits, ZSRR0_DCD)) 1284 SET(ttybits, TIOCM_CD); 1285 if (ISSET(zsbits, ZSRR0_CTS)) 1286 SET(ttybits, TIOCM_CTS); 1287 1288 return (ttybits); 1289 } 1290 1291 /* 1292 * Try to block or unblock input using hardware flow-control. 1293 * This is called by kern/tty.c if MDMBUF|CRTSCTS is set, and 1294 * if this function returns non-zero, the TS_TBLOCK flag will 1295 * be set or cleared according to the "block" arg passed. 1296 */ 1297 int 1298 zshwiflow(tp, block) 1299 struct tty *tp; 1300 int block; 1301 { 1302 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(tp->t_dev)]; 1303 struct zs_chanstate *cs = zst->zst_cs; 1304 int s; 1305 1306 if (cs->cs_wr5_rts == 0) 1307 return (0); 1308 1309 s = splzs(); 1310 if (block) { 1311 if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1312 SET(zst->zst_rx_flags, RX_TTY_BLOCKED); 1313 zs_hwiflow(zst); 1314 } 1315 } else { 1316 if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1317 CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1318 zst->zst_rx_ready = 1; 1319 cs->cs_softreq = 1; 1320 } 1321 if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1322 CLR(zst->zst_rx_flags, RX_TTY_BLOCKED); 1323 zs_hwiflow(zst); 1324 } 1325 } 1326 splx(s); 1327 return (1); 1328 } 1329 1330 /* 1331 * Internal version of zshwiflow 1332 * called at splzs 1333 */ 1334 static void 1335 zs_hwiflow(zst) 1336 struct zstty_softc *zst; 1337 { 1338 struct zs_chanstate *cs = zst->zst_cs; 1339 1340 if (cs->cs_wr5_rts == 0) 1341 return; 1342 1343 if (ISSET(zst->zst_rx_flags, RX_ANY_BLOCK)) { 1344 CLR(cs->cs_preg[5], cs->cs_wr5_rts); 1345 CLR(cs->cs_creg[5], cs->cs_wr5_rts); 1346 } else { 1347 SET(cs->cs_preg[5], cs->cs_wr5_rts); 1348 SET(cs->cs_creg[5], cs->cs_wr5_rts); 1349 } 1350 zs_write_reg(cs, 5, cs->cs_creg[5]); 1351 } 1352 1353 1354 /**************************************************************** 1355 * Interface to the lower layer (zscc) 1356 ****************************************************************/ 1357 1358 #define integrate static inline 1359 integrate void zstty_rxsoft __P((struct zstty_softc *, struct tty *)); 1360 integrate void zstty_txsoft __P((struct zstty_softc *, struct tty *)); 1361 integrate void zstty_stsoft __P((struct zstty_softc *, struct tty *)); 1362 static void zstty_diag __P((void *)); 1363 1364 /* 1365 * receiver ready interrupt. 1366 * called at splzs 1367 */ 1368 static void 1369 zstty_rxint(cs) 1370 struct zs_chanstate *cs; 1371 { 1372 struct zstty_softc *zst = cs->cs_private; 1373 u_char *put, *end; 1374 u_int cc; 1375 u_char rr0, rr1, c; 1376 1377 end = zst->zst_ebuf; 1378 put = zst->zst_rbput; 1379 cc = zst->zst_rbavail; 1380 1381 while (cc > 0) { 1382 /* 1383 * First read the status, because reading the received char 1384 * destroys the status of this char. 1385 */ 1386 rr1 = zs_read_reg(cs, 1); 1387 c = zs_read_data(cs); 1388 1389 if (ISSET(rr1, ZSRR1_FE | ZSRR1_DO | ZSRR1_PE)) { 1390 /* Clear the receive error. */ 1391 zs_write_csr(cs, ZSWR0_RESET_ERRORS); 1392 } 1393 1394 put[0] = c; 1395 put[1] = rr1; 1396 put += 2; 1397 if (put >= end) 1398 put = zst->zst_rbuf; 1399 cc--; 1400 1401 rr0 = zs_read_csr(cs); 1402 if (!ISSET(rr0, ZSRR0_RX_READY)) 1403 break; 1404 } 1405 1406 /* 1407 * Current string of incoming characters ended because 1408 * no more data was available or we ran out of space. 1409 * Schedule a receive event if any data was received. 1410 * If we're out of space, turn off receive interrupts. 1411 */ 1412 zst->zst_rbput = put; 1413 zst->zst_rbavail = cc; 1414 if (!ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1415 zst->zst_rx_ready = 1; 1416 cs->cs_softreq = 1; 1417 } 1418 1419 /* 1420 * See if we are in danger of overflowing a buffer. If 1421 * so, use hardware flow control to ease the pressure. 1422 */ 1423 if (!ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED) && 1424 cc < zst->zst_r_hiwat) { 1425 SET(zst->zst_rx_flags, RX_IBUF_BLOCKED); 1426 zs_hwiflow(zst); 1427 } 1428 1429 /* 1430 * If we're out of space, disable receive interrupts 1431 * until the queue has drained a bit. 1432 */ 1433 if (!cc) { 1434 SET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED); 1435 CLR(cs->cs_preg[1], ZSWR1_RIE); 1436 cs->cs_creg[1] = cs->cs_preg[1]; 1437 zs_write_reg(cs, 1, cs->cs_creg[1]); 1438 } 1439 1440 #if 0 1441 printf("%xH%04d\n", zst->zst_rx_flags, zst->zst_rbavail); 1442 #endif 1443 } 1444 1445 /* 1446 * transmitter ready interrupt. (splzs) 1447 */ 1448 static void 1449 zstty_txint(cs) 1450 struct zs_chanstate *cs; 1451 { 1452 struct zstty_softc *zst = cs->cs_private; 1453 1454 /* 1455 * If we've delayed a parameter change, do it now, and restart 1456 * output. 1457 */ 1458 if (cs->cs_heldchange) { 1459 zs_loadchannelregs(cs); 1460 cs->cs_heldchange = 0; 1461 zst->zst_tbc = zst->zst_heldtbc; 1462 zst->zst_heldtbc = 0; 1463 } 1464 1465 /* Output the next character in the buffer, if any. */ 1466 if (zst->zst_tbc > 0) { 1467 zs_write_data(cs, *zst->zst_tba); 1468 zst->zst_tbc--; 1469 zst->zst_tba++; 1470 } else { 1471 /* Disable transmit completion interrupts if necessary. */ 1472 if (ISSET(cs->cs_preg[1], ZSWR1_TIE)) { 1473 CLR(cs->cs_preg[1], ZSWR1_TIE); 1474 cs->cs_creg[1] = cs->cs_preg[1]; 1475 zs_write_reg(cs, 1, cs->cs_creg[1]); 1476 } 1477 if (zst->zst_tx_busy) { 1478 zst->zst_tx_busy = 0; 1479 zst->zst_tx_done = 1; 1480 cs->cs_softreq = 1; 1481 } 1482 } 1483 } 1484 1485 /* 1486 * status change interrupt. (splzs) 1487 */ 1488 static void 1489 zstty_stint(cs, force) 1490 struct zs_chanstate *cs; 1491 int force; 1492 { 1493 struct zstty_softc *zst = cs->cs_private; 1494 u_char rr0, delta; 1495 1496 rr0 = zs_read_csr(cs); 1497 zs_write_csr(cs, ZSWR0_RESET_STATUS); 1498 1499 /* 1500 * Check here for console break, so that we can abort 1501 * even when interrupts are locking up the machine. 1502 */ 1503 if (ISSET(rr0, ZSRR0_BREAK) && 1504 ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE_INPUT)) { 1505 zs_abort(cs); 1506 return; 1507 } 1508 1509 if (!force) 1510 delta = rr0 ^ cs->cs_rr0; 1511 else 1512 delta = cs->cs_rr0_mask; 1513 cs->cs_rr0 = rr0; 1514 1515 if (ISSET(delta, cs->cs_rr0_mask)) { 1516 SET(cs->cs_rr0_delta, delta); 1517 1518 /* 1519 * Pulse-per-second clock signal on edge of DCD? 1520 */ 1521 if (ISSET(delta, zst->zst_ppsmask)) { 1522 struct timeval tv; 1523 if (ISSET(rr0, zst->zst_ppsmask) == zst->zst_ppsassert) { 1524 /* XXX nanotime() */ 1525 microtime(&tv); 1526 TIMEVAL_TO_TIMESPEC(&tv, 1527 &zst->ppsinfo.assert_timestamp); 1528 if (zst->ppsparam.mode & PPS_OFFSETASSERT) { 1529 timespecadd(&zst->ppsinfo.assert_timestamp, 1530 &zst->ppsparam.assert_offset, 1531 &zst->ppsinfo.assert_timestamp); 1532 } 1533 1534 #ifdef PPS_SYNC 1535 if (zst->ppsparam.mode & PPS_HARDPPSONASSERT) 1536 hardpps(&tv, tv.tv_usec); 1537 #endif 1538 zst->ppsinfo.assert_sequence++; 1539 zst->ppsinfo.current_mode = zst->ppsparam.mode; 1540 } else if (ISSET(rr0, zst->zst_ppsmask) == 1541 zst->zst_ppsclear) { 1542 /* XXX nanotime() */ 1543 microtime(&tv); 1544 TIMEVAL_TO_TIMESPEC(&tv, 1545 &zst->ppsinfo.clear_timestamp); 1546 if (zst->ppsparam.mode & PPS_OFFSETCLEAR) { 1547 timespecadd(&zst->ppsinfo.clear_timestamp, 1548 &zst->ppsparam.clear_offset, 1549 &zst->ppsinfo.clear_timestamp); 1550 } 1551 1552 #ifdef PPS_SYNC 1553 if (zst->ppsparam.mode & PPS_HARDPPSONCLEAR) 1554 hardpps(&tv, tv.tv_usec); 1555 #endif 1556 zst->ppsinfo.clear_sequence++; 1557 zst->ppsinfo.current_mode = zst->ppsparam.mode; 1558 } 1559 } 1560 1561 /* 1562 * Stop output immediately if we lose the output 1563 * flow control signal or carrier detect. 1564 */ 1565 if (ISSET(~rr0, cs->cs_rr0_mask)) { 1566 zst->zst_tbc = 0; 1567 zst->zst_heldtbc = 0; 1568 } 1569 1570 zst->zst_st_check = 1; 1571 cs->cs_softreq = 1; 1572 } 1573 } 1574 1575 void 1576 zstty_diag(arg) 1577 void *arg; 1578 { 1579 struct zstty_softc *zst = arg; 1580 int overflows, floods; 1581 int s; 1582 1583 s = splzs(); 1584 overflows = zst->zst_overflows; 1585 zst->zst_overflows = 0; 1586 floods = zst->zst_floods; 1587 zst->zst_floods = 0; 1588 zst->zst_errors = 0; 1589 splx(s); 1590 1591 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1592 zst->zst_dev.dv_xname, 1593 overflows, overflows == 1 ? "" : "s", 1594 floods, floods == 1 ? "" : "s"); 1595 } 1596 1597 integrate void 1598 zstty_rxsoft(zst, tp) 1599 struct zstty_softc *zst; 1600 struct tty *tp; 1601 { 1602 struct zs_chanstate *cs = zst->zst_cs; 1603 int (*rint) __P((int c, struct tty *tp)) = linesw[tp->t_line].l_rint; 1604 u_char *get, *end; 1605 u_int cc, scc; 1606 u_char rr1; 1607 int code; 1608 int s; 1609 1610 end = zst->zst_ebuf; 1611 get = zst->zst_rbget; 1612 scc = cc = zstty_rbuf_size - zst->zst_rbavail; 1613 1614 if (cc == zstty_rbuf_size) { 1615 zst->zst_floods++; 1616 if (zst->zst_errors++ == 0) 1617 callout_start(&zst->zst_diag_ch, 60 * hz, 1618 zstty_diag, zst); 1619 } 1620 1621 /* If not yet open, drop the entire buffer content here */ 1622 if (!ISSET(tp->t_state, TS_ISOPEN)) { 1623 get += cc << 1; 1624 if (get >= end) 1625 get -= zstty_rbuf_size << 1; 1626 cc = 0; 1627 } 1628 while (cc) { 1629 code = get[0]; 1630 rr1 = get[1]; 1631 if (ISSET(rr1, ZSRR1_DO | ZSRR1_FE | ZSRR1_PE)) { 1632 if (ISSET(rr1, ZSRR1_DO)) { 1633 zst->zst_overflows++; 1634 if (zst->zst_errors++ == 0) 1635 callout_start(&zst->zst_diag_ch, 1636 60 * hz, zstty_diag, zst); 1637 } 1638 if (ISSET(rr1, ZSRR1_FE)) 1639 SET(code, TTY_FE); 1640 if (ISSET(rr1, ZSRR1_PE)) 1641 SET(code, TTY_PE); 1642 } 1643 if ((*rint)(code, tp) == -1) { 1644 /* 1645 * The line discipline's buffer is out of space. 1646 */ 1647 if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1648 /* 1649 * We're either not using flow control, or the 1650 * line discipline didn't tell us to block for 1651 * some reason. Either way, we have no way to 1652 * know when there's more space available, so 1653 * just drop the rest of the data. 1654 */ 1655 get += cc << 1; 1656 if (get >= end) 1657 get -= zstty_rbuf_size << 1; 1658 cc = 0; 1659 } else { 1660 /* 1661 * Don't schedule any more receive processing 1662 * until the line discipline tells us there's 1663 * space available (through comhwiflow()). 1664 * Leave the rest of the data in the input 1665 * buffer. 1666 */ 1667 SET(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1668 } 1669 break; 1670 } 1671 get += 2; 1672 if (get >= end) 1673 get = zst->zst_rbuf; 1674 cc--; 1675 } 1676 1677 if (cc != scc) { 1678 zst->zst_rbget = get; 1679 s = splzs(); 1680 cc = zst->zst_rbavail += scc - cc; 1681 /* Buffers should be ok again, release possible block. */ 1682 if (cc >= zst->zst_r_lowat) { 1683 if (ISSET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED)) { 1684 CLR(zst->zst_rx_flags, RX_IBUF_OVERFLOWED); 1685 SET(cs->cs_preg[1], ZSWR1_RIE); 1686 cs->cs_creg[1] = cs->cs_preg[1]; 1687 zs_write_reg(cs, 1, cs->cs_creg[1]); 1688 } 1689 if (ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED)) { 1690 CLR(zst->zst_rx_flags, RX_IBUF_BLOCKED); 1691 zs_hwiflow(zst); 1692 } 1693 } 1694 splx(s); 1695 } 1696 1697 #if 0 1698 printf("%xS%04d\n", zst->zst_rx_flags, zst->zst_rbavail); 1699 #endif 1700 } 1701 1702 integrate void 1703 zstty_txsoft(zst, tp) 1704 struct zstty_softc *zst; 1705 struct tty *tp; 1706 { 1707 1708 CLR(tp->t_state, TS_BUSY); 1709 if (ISSET(tp->t_state, TS_FLUSH)) 1710 CLR(tp->t_state, TS_FLUSH); 1711 else 1712 ndflush(&tp->t_outq, (int)(zst->zst_tba - tp->t_outq.c_cf)); 1713 (*linesw[tp->t_line].l_start)(tp); 1714 } 1715 1716 integrate void 1717 zstty_stsoft(zst, tp) 1718 struct zstty_softc *zst; 1719 struct tty *tp; 1720 { 1721 struct zs_chanstate *cs = zst->zst_cs; 1722 u_char rr0, delta; 1723 int s; 1724 1725 s = splzs(); 1726 rr0 = cs->cs_rr0; 1727 delta = cs->cs_rr0_delta; 1728 cs->cs_rr0_delta = 0; 1729 splx(s); 1730 1731 if (ISSET(delta, cs->cs_rr0_dcd)) { 1732 /* 1733 * Inform the tty layer that carrier detect changed. 1734 */ 1735 (void) (*linesw[tp->t_line].l_modem)(tp, ISSET(rr0, ZSRR0_DCD)); 1736 } 1737 1738 if (ISSET(delta, cs->cs_rr0_cts)) { 1739 /* Block or unblock output according to flow control. */ 1740 if (ISSET(rr0, cs->cs_rr0_cts)) { 1741 zst->zst_tx_stopped = 0; 1742 (*linesw[tp->t_line].l_start)(tp); 1743 } else { 1744 zst->zst_tx_stopped = 1; 1745 } 1746 } 1747 } 1748 1749 /* 1750 * Software interrupt. Called at zssoft 1751 * 1752 * The main job to be done here is to empty the input ring 1753 * by passing its contents up to the tty layer. The ring is 1754 * always emptied during this operation, therefore the ring 1755 * must not be larger than the space after "high water" in 1756 * the tty layer, or the tty layer might drop our input. 1757 * 1758 * Note: an "input blockage" condition is assumed to exist if 1759 * EITHER the TS_TBLOCK flag or zst_rx_blocked flag is set. 1760 */ 1761 static void 1762 zstty_softint(cs) 1763 struct zs_chanstate *cs; 1764 { 1765 struct zstty_softc *zst = cs->cs_private; 1766 struct tty *tp = zst->zst_tty; 1767 int s; 1768 1769 s = spltty(); 1770 1771 if (zst->zst_rx_ready) { 1772 zst->zst_rx_ready = 0; 1773 zstty_rxsoft(zst, tp); 1774 } 1775 1776 if (zst->zst_st_check) { 1777 zst->zst_st_check = 0; 1778 zstty_stsoft(zst, tp); 1779 } 1780 1781 if (zst->zst_tx_done) { 1782 zst->zst_tx_done = 0; 1783 zstty_txsoft(zst, tp); 1784 } 1785 1786 splx(s); 1787 } 1788 1789 struct zsops zsops_tty = { 1790 zstty_rxint, /* receive char available */ 1791 zstty_stint, /* external/status */ 1792 zstty_txint, /* xmit buffer empty */ 1793 zstty_softint, /* process software interrupt */ 1794 }; 1795
Indexes created Mon Sep 29 13:09:55 GMT 2025