z8530tty.c revision 1.70
1 /* $NetBSD: z8530tty.c,v 1.70 2000/11/01 23:54:57 eeh 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 *, u_long, 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 = device_lookup(&zstty_cd, ZSUNIT(dev)); 417 418 return (zst->zst_tty); 419 } 420 421 422 void 423 zs_shutdown(zst) 424 struct zstty_softc *zst; 425 { 426 struct zs_chanstate *cs = zst->zst_cs; 427 struct tty *tp = zst->zst_tty; 428 int s; 429 430 s = splzs(); 431 432 /* If we were asserting flow control, then deassert it. */ 433 SET(zst->zst_rx_flags, RX_IBUF_BLOCKED); 434 zs_hwiflow(zst); 435 436 /* Clear any break condition set with TIOCSBRK. */ 437 zs_break(cs, 0); 438 439 /* Turn off PPS capture on last close. */ 440 zst->zst_ppsmask = 0; 441 zst->ppsparam.mode = 0; 442 443 /* 444 * Hang up if necessary. Wait a bit, so the other side has time to 445 * notice even if we immediately open the port again. 446 */ 447 if (ISSET(tp->t_cflag, HUPCL)) { 448 zs_modem(zst, 0); 449 (void) tsleep(cs, TTIPRI, ttclos, hz); 450 } 451 452 /* Turn off interrupts if not the console. */ 453 if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 454 CLR(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE); 455 cs->cs_creg[1] = cs->cs_preg[1]; 456 zs_write_reg(cs, 1, cs->cs_creg[1]); 457 } 458 459 /* Call the power management hook. */ 460 if (cs->disable) { 461 #ifdef DIAGNOSTIC 462 if (!cs->enabled) 463 panic("zs_shutdown: not enabled?"); 464 #endif 465 (*cs->disable)(zst->zst_cs); 466 } 467 468 splx(s); 469 } 470 471 /* 472 * Open a zs serial (tty) port. 473 */ 474 int 475 zsopen(dev, flags, mode, p) 476 dev_t dev; 477 int flags; 478 int mode; 479 struct proc *p; 480 { 481 struct zstty_softc *zst; 482 struct zs_chanstate *cs; 483 struct tty *tp; 484 int s, s2; 485 int error; 486 487 zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 488 if (zst == NULL) 489 return (ENXIO); 490 491 tp = zst->zst_tty; 492 cs = zst->zst_cs; 493 494 /* If KGDB took the line, then tp==NULL */ 495 if (tp == NULL) 496 return (EBUSY); 497 498 if (ISSET(tp->t_state, TS_ISOPEN) && 499 ISSET(tp->t_state, TS_XCLUDE) && 500 p->p_ucred->cr_uid != 0) 501 return (EBUSY); 502 503 s = spltty(); 504 505 /* 506 * Do the following iff this is a first open. 507 */ 508 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 509 struct termios t; 510 511 tp->t_dev = dev; 512 513 /* Call the power management hook. */ 514 if (cs->enable) { 515 if ((*cs->enable)(cs)) { 516 splx(s); 517 printf("%s: device enable failed\n", 518 zst->zst_dev.dv_xname); 519 return (EIO); 520 } 521 } 522 523 /* 524 * Initialize the termios status to the defaults. Add in the 525 * sticky bits from TIOCSFLAGS. 526 */ 527 t.c_ispeed = 0; 528 t.c_ospeed = cs->cs_defspeed; 529 t.c_cflag = cs->cs_defcflag; 530 if (ISSET(zst->zst_swflags, TIOCFLAG_CLOCAL)) 531 SET(t.c_cflag, CLOCAL); 532 if (ISSET(zst->zst_swflags, TIOCFLAG_CRTSCTS)) 533 SET(t.c_cflag, CRTSCTS); 534 if (ISSET(zst->zst_swflags, TIOCFLAG_CDTRCTS)) 535 SET(t.c_cflag, CDTRCTS); 536 if (ISSET(zst->zst_swflags, TIOCFLAG_MDMBUF)) 537 SET(t.c_cflag, MDMBUF); 538 539 s2 = splzs(); 540 541 /* 542 * Turn on receiver and status interrupts. 543 * We defer the actual write of the register to zsparam(), 544 * but we must make sure status interrupts are turned on by 545 * the time zsparam() reads the initial rr0 state. 546 */ 547 SET(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE); 548 549 /* Clear PPS capture state on first open. */ 550 zst->zst_ppsmask = 0; 551 zst->ppsparam.mode = 0; 552 553 splx(s2); 554 555 /* Make sure zsparam will see changes. */ 556 tp->t_ospeed = 0; 557 (void) zsparam(tp, &t); 558 559 /* 560 * Note: zsparam has done: cflag, ispeed, ospeed 561 * so we just need to do: iflag, oflag, lflag, cc 562 * For "raw" mode, just leave all zeros. 563 */ 564 if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_RAW)) { 565 tp->t_iflag = TTYDEF_IFLAG; 566 tp->t_oflag = TTYDEF_OFLAG; 567 tp->t_lflag = TTYDEF_LFLAG; 568 } else { 569 tp->t_iflag = 0; 570 tp->t_oflag = 0; 571 tp->t_lflag = 0; 572 } 573 ttychars(tp); 574 ttsetwater(tp); 575 576 s2 = splzs(); 577 578 /* 579 * Turn on DTR. We must always do this, even if carrier is not 580 * present, because otherwise we'd have to use TIOCSDTR 581 * immediately after setting CLOCAL, which applications do not 582 * expect. We always assert DTR while the device is open 583 * unless explicitly requested to deassert it. 584 */ 585 zs_modem(zst, 1); 586 587 /* Clear the input ring, and unblock. */ 588 zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf; 589 zst->zst_rbavail = zstty_rbuf_size; 590 zs_iflush(cs); 591 CLR(zst->zst_rx_flags, RX_ANY_BLOCK); 592 zs_hwiflow(zst); 593 594 splx(s2); 595 } 596 597 splx(s); 598 599 error = ttyopen(tp, ZSDIALOUT(dev), ISSET(flags, O_NONBLOCK)); 600 if (error) 601 goto bad; 602 603 error = (*tp->t_linesw->l_open)(dev, tp); 604 if (error) 605 goto bad; 606 607 return (0); 608 609 bad: 610 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 611 /* 612 * We failed to open the device, and nobody else had it opened. 613 * Clean up the state as appropriate. 614 */ 615 zs_shutdown(zst); 616 } 617 618 return (error); 619 } 620 621 /* 622 * Close a zs serial port. 623 */ 624 int 625 zsclose(dev, flags, mode, p) 626 dev_t dev; 627 int flags; 628 int mode; 629 struct proc *p; 630 { 631 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 632 struct tty *tp = zst->zst_tty; 633 634 /* XXX This is for cons.c. */ 635 if (!ISSET(tp->t_state, TS_ISOPEN)) 636 return 0; 637 638 (*tp->t_linesw->l_close)(tp, flags); 639 ttyclose(tp); 640 641 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 642 /* 643 * Although we got a last close, the device may still be in 644 * use; e.g. if this was the dialout node, and there are still 645 * processes waiting for carrier on the non-dialout node. 646 */ 647 zs_shutdown(zst); 648 } 649 650 return (0); 651 } 652 653 /* 654 * Read/write zs serial port. 655 */ 656 int 657 zsread(dev, uio, flags) 658 dev_t dev; 659 struct uio *uio; 660 int flags; 661 { 662 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 663 struct tty *tp = zst->zst_tty; 664 665 return ((*tp->t_linesw->l_read)(tp, uio, flags)); 666 } 667 668 int 669 zswrite(dev, uio, flags) 670 dev_t dev; 671 struct uio *uio; 672 int flags; 673 { 674 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 675 struct tty *tp = zst->zst_tty; 676 677 return ((*tp->t_linesw->l_write)(tp, uio, flags)); 678 } 679 680 int 681 zsioctl(dev, cmd, data, flag, p) 682 dev_t dev; 683 u_long cmd; 684 caddr_t data; 685 int flag; 686 struct proc *p; 687 { 688 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 689 struct zs_chanstate *cs = zst->zst_cs; 690 struct tty *tp = zst->zst_tty; 691 int error; 692 int s; 693 694 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, p); 695 if (error >= 0) 696 return (error); 697 698 error = ttioctl(tp, cmd, data, flag, p); 699 if (error >= 0) 700 return (error); 701 702 #ifdef ZS_MD_IOCTL 703 error = ZS_MD_IOCTL; 704 if (error >= 0) 705 return (error); 706 #endif /* ZS_MD_IOCTL */ 707 708 error = 0; 709 710 s = splzs(); 711 712 switch (cmd) { 713 case TIOCSBRK: 714 zs_break(cs, 1); 715 break; 716 717 case TIOCCBRK: 718 zs_break(cs, 0); 719 break; 720 721 case TIOCGFLAGS: 722 *(int *)data = zst->zst_swflags; 723 break; 724 725 case TIOCSFLAGS: 726 error = suser(p->p_ucred, &p->p_acflag); 727 if (error) 728 break; 729 zst->zst_swflags = *(int *)data; 730 break; 731 732 case TIOCSDTR: 733 zs_modem(zst, 1); 734 break; 735 736 case TIOCCDTR: 737 zs_modem(zst, 0); 738 break; 739 740 case TIOCMSET: 741 case TIOCMBIS: 742 case TIOCMBIC: 743 tiocm_to_zs(zst, cmd, *(int *)data); 744 break; 745 746 case TIOCMGET: 747 *(int *)data = zs_to_tiocm(zst); 748 break; 749 750 case PPS_IOC_CREATE: 751 break; 752 753 case PPS_IOC_DESTROY: 754 break; 755 756 case PPS_IOC_GETPARAMS: { 757 pps_params_t *pp; 758 pp = (pps_params_t *)data; 759 *pp = zst->ppsparam; 760 break; 761 } 762 763 case PPS_IOC_SETPARAMS: { 764 pps_params_t *pp; 765 int mode; 766 if (cs->cs_rr0_pps == 0) { 767 error = EINVAL; 768 break; 769 } 770 pp = (pps_params_t *)data; 771 if (pp->mode & ~zsppscap) { 772 error = EINVAL; 773 break; 774 } 775 zst->ppsparam = *pp; 776 /* 777 * compute masks from user-specified timestamp state. 778 */ 779 mode = zst->ppsparam.mode; 780 #ifdef PPS_SYNC 781 if (mode & PPS_HARDPPSONASSERT) { 782 mode |= PPS_CAPTUREASSERT; 783 /* XXX revoke any previous HARDPPS source */ 784 } 785 if (mode & PPS_HARDPPSONCLEAR) { 786 mode |= PPS_CAPTURECLEAR; 787 /* XXX revoke any previous HARDPPS source */ 788 } 789 #endif /* PPS_SYNC */ 790 switch (mode & PPS_CAPTUREBOTH) { 791 case 0: 792 zst->zst_ppsmask = 0; 793 break; 794 795 case PPS_CAPTUREASSERT: 796 zst->zst_ppsmask = ZSRR0_DCD; 797 zst->zst_ppsassert = ZSRR0_DCD; 798 zst->zst_ppsclear = -1; 799 break; 800 801 case PPS_CAPTURECLEAR: 802 zst->zst_ppsmask = ZSRR0_DCD; 803 zst->zst_ppsassert = -1; 804 zst->zst_ppsclear = 0; 805 break; 806 807 case PPS_CAPTUREBOTH: 808 zst->zst_ppsmask = ZSRR0_DCD; 809 zst->zst_ppsassert = ZSRR0_DCD; 810 zst->zst_ppsclear = 0; 811 break; 812 813 default: 814 error = EINVAL; 815 break; 816 } 817 818 /* 819 * Now update interrupts. 820 */ 821 zs_maskintr(zst); 822 /* 823 * If nothing is being transmitted, set up new current values, 824 * else mark them as pending. 825 */ 826 if (!cs->cs_heldchange) { 827 if (zst->zst_tx_busy) { 828 zst->zst_heldtbc = zst->zst_tbc; 829 zst->zst_tbc = 0; 830 cs->cs_heldchange = 1; 831 } else 832 zs_loadchannelregs(cs); 833 } 834 835 break; 836 } 837 838 case PPS_IOC_GETCAP: 839 *(int *)data = zsppscap; 840 break; 841 842 case PPS_IOC_FETCH: { 843 pps_info_t *pi; 844 pi = (pps_info_t *)data; 845 *pi = zst->ppsinfo; 846 break; 847 } 848 849 case TIOCDCDTIMESTAMP: /* XXX old, overloaded API used by xntpd v3 */ 850 if (cs->cs_rr0_pps == 0) { 851 error = EINVAL; 852 break; 853 } 854 /* 855 * Some GPS clocks models use the falling rather than 856 * rising edge as the on-the-second signal. 857 * The old API has no way to specify PPS polarity. 858 */ 859 zst->zst_ppsmask = ZSRR0_DCD; 860 #ifndef PPS_TRAILING_EDGE 861 zst->zst_ppsassert = ZSRR0_DCD; 862 zst->zst_ppsclear = -1; 863 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 864 &zst->ppsinfo.assert_timestamp); 865 #else 866 zst->zst_ppsassert = -1; 867 zst->zst_ppsclear = 01; 868 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 869 &zst->ppsinfo.clear_timestamp); 870 #endif 871 /* 872 * Now update interrupts. 873 */ 874 zs_maskintr(zst); 875 /* 876 * If nothing is being transmitted, set up new current values, 877 * else mark them as pending. 878 */ 879 if (!cs->cs_heldchange) { 880 if (zst->zst_tx_busy) { 881 zst->zst_heldtbc = zst->zst_tbc; 882 zst->zst_tbc = 0; 883 cs->cs_heldchange = 1; 884 } else 885 zs_loadchannelregs(cs); 886 } 887 888 break; 889 890 default: 891 error = ENOTTY; 892 break; 893 } 894 895 splx(s); 896 897 return (error); 898 } 899 900 /* 901 * Start or restart transmission. 902 */ 903 static void 904 zsstart(tp) 905 struct tty *tp; 906 { 907 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(tp->t_dev)); 908 struct zs_chanstate *cs = zst->zst_cs; 909 int s; 910 911 s = spltty(); 912 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 913 goto out; 914 if (zst->zst_tx_stopped) 915 goto out; 916 917 if (tp->t_outq.c_cc <= tp->t_lowat) { 918 if (ISSET(tp->t_state, TS_ASLEEP)) { 919 CLR(tp->t_state, TS_ASLEEP); 920 wakeup((caddr_t)&tp->t_outq); 921 } 922 selwakeup(&tp->t_wsel); 923 if (tp->t_outq.c_cc == 0) 924 goto out; 925 } 926 927 /* Grab the first contiguous region of buffer space. */ 928 { 929 u_char *tba; 930 int tbc; 931 932 tba = tp->t_outq.c_cf; 933 tbc = ndqb(&tp->t_outq, 0); 934 935 (void) splzs(); 936 937 zst->zst_tba = tba; 938 zst->zst_tbc = tbc; 939 } 940 941 SET(tp->t_state, TS_BUSY); 942 zst->zst_tx_busy = 1; 943 944 /* Enable transmit completion interrupts if necessary. */ 945 if (!ISSET(cs->cs_preg[1], ZSWR1_TIE)) { 946 SET(cs->cs_preg[1], ZSWR1_TIE); 947 cs->cs_creg[1] = cs->cs_preg[1]; 948 zs_write_reg(cs, 1, cs->cs_creg[1]); 949 } 950 951 /* Output the first character of the contiguous buffer. */ 952 { 953 zs_write_data(cs, *zst->zst_tba); 954 zst->zst_tbc--; 955 zst->zst_tba++; 956 } 957 out: 958 splx(s); 959 return; 960 } 961 962 /* 963 * Stop output, e.g., for ^S or output flush. 964 */ 965 void 966 zsstop(tp, flag) 967 struct tty *tp; 968 int flag; 969 { 970 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(tp->t_dev)); 971 int s; 972 973 s = splzs(); 974 if (ISSET(tp->t_state, TS_BUSY)) { 975 /* Stop transmitting at the next chunk. */ 976 zst->zst_tbc = 0; 977 zst->zst_heldtbc = 0; 978 if (!ISSET(tp->t_state, TS_TTSTOP)) 979 SET(tp->t_state, TS_FLUSH); 980 } 981 splx(s); 982 } 983 984 /* 985 * Set ZS tty parameters from termios. 986 * XXX - Should just copy the whole termios after 987 * making sure all the changes could be done. 988 */ 989 static int 990 zsparam(tp, t) 991 struct tty *tp; 992 struct termios *t; 993 { 994 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(tp->t_dev)); 995 struct zs_chanstate *cs = zst->zst_cs; 996 int ospeed, cflag; 997 u_char tmp3, tmp4, tmp5; 998 int s, error; 999 1000 ospeed = t->c_ospeed; 1001 cflag = t->c_cflag; 1002 1003 /* Check requested parameters. */ 1004 if (ospeed < 0) 1005 return (EINVAL); 1006 if (t->c_ispeed && t->c_ispeed != ospeed) 1007 return (EINVAL); 1008 1009 /* 1010 * For the console, always force CLOCAL and !HUPCL, so that the port 1011 * is always active. 1012 */ 1013 if (ISSET(zst->zst_swflags, TIOCFLAG_SOFTCAR) || 1014 ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 1015 SET(cflag, CLOCAL); 1016 CLR(cflag, HUPCL); 1017 } 1018 1019 /* 1020 * Only whack the UART when params change. 1021 * Some callers need to clear tp->t_ospeed 1022 * to make sure initialization gets done. 1023 */ 1024 if (tp->t_ospeed == ospeed && 1025 tp->t_cflag == cflag) 1026 return (0); 1027 1028 /* 1029 * Call MD functions to deal with changed 1030 * clock modes or H/W flow control modes. 1031 * The BRG divisor is set now. (reg 12,13) 1032 */ 1033 error = zs_set_speed(cs, ospeed); 1034 if (error) 1035 return (error); 1036 error = zs_set_modes(cs, cflag); 1037 if (error) 1038 return (error); 1039 1040 /* 1041 * Block interrupts so that state will not 1042 * be altered until we are done setting it up. 1043 * 1044 * Initial values in cs_preg are set before 1045 * our attach routine is called. The master 1046 * interrupt enable is handled by zsc.c 1047 * 1048 */ 1049 s = splzs(); 1050 1051 /* 1052 * Recalculate which status ints to enable. 1053 */ 1054 zs_maskintr(zst); 1055 1056 /* Recompute character size bits. */ 1057 tmp3 = cs->cs_preg[3]; 1058 tmp5 = cs->cs_preg[5]; 1059 CLR(tmp3, ZSWR3_RXSIZE); 1060 CLR(tmp5, ZSWR5_TXSIZE); 1061 switch (ISSET(cflag, CSIZE)) { 1062 case CS5: 1063 SET(tmp3, ZSWR3_RX_5); 1064 SET(tmp5, ZSWR5_TX_5); 1065 break; 1066 case CS6: 1067 SET(tmp3, ZSWR3_RX_6); 1068 SET(tmp5, ZSWR5_TX_6); 1069 break; 1070 case CS7: 1071 SET(tmp3, ZSWR3_RX_7); 1072 SET(tmp5, ZSWR5_TX_7); 1073 break; 1074 case CS8: 1075 SET(tmp3, ZSWR3_RX_8); 1076 SET(tmp5, ZSWR5_TX_8); 1077 break; 1078 } 1079 cs->cs_preg[3] = tmp3; 1080 cs->cs_preg[5] = tmp5; 1081 1082 /* 1083 * Recompute the stop bits and parity bits. Note that 1084 * zs_set_speed() may have set clock selection bits etc. 1085 * in wr4, so those must preserved. 1086 */ 1087 tmp4 = cs->cs_preg[4]; 1088 CLR(tmp4, ZSWR4_SBMASK | ZSWR4_PARMASK); 1089 if (ISSET(cflag, CSTOPB)) 1090 SET(tmp4, ZSWR4_TWOSB); 1091 else 1092 SET(tmp4, ZSWR4_ONESB); 1093 if (!ISSET(cflag, PARODD)) 1094 SET(tmp4, ZSWR4_EVENP); 1095 if (ISSET(cflag, PARENB)) 1096 SET(tmp4, ZSWR4_PARENB); 1097 cs->cs_preg[4] = tmp4; 1098 1099 /* And copy to tty. */ 1100 tp->t_ispeed = 0; 1101 tp->t_ospeed = ospeed; 1102 tp->t_cflag = cflag; 1103 1104 /* 1105 * If nothing is being transmitted, set up new current values, 1106 * else mark them as pending. 1107 */ 1108 if (!cs->cs_heldchange) { 1109 if (zst->zst_tx_busy) { 1110 zst->zst_heldtbc = zst->zst_tbc; 1111 zst->zst_tbc = 0; 1112 cs->cs_heldchange = 1; 1113 } else 1114 zs_loadchannelregs(cs); 1115 } 1116 1117 /* 1118 * If hardware flow control is disabled, turn off the buffer water 1119 * marks and unblock any soft flow control state. Otherwise, enable 1120 * the water marks. 1121 */ 1122 if (!ISSET(cflag, CHWFLOW)) { 1123 zst->zst_r_hiwat = 0; 1124 zst->zst_r_lowat = 0; 1125 if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1126 CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1127 zst->zst_rx_ready = 1; 1128 cs->cs_softreq = 1; 1129 } 1130 if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 1131 CLR(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 1132 zs_hwiflow(zst); 1133 } 1134 } else { 1135 zst->zst_r_hiwat = zstty_rbuf_hiwat; 1136 zst->zst_r_lowat = zstty_rbuf_lowat; 1137 } 1138 1139 /* 1140 * Force a recheck of the hardware carrier and flow control status, 1141 * since we may have changed which bits we're looking at. 1142 */ 1143 zstty_stint(cs, 1); 1144 1145 splx(s); 1146 1147 /* 1148 * If hardware flow control is disabled, unblock any hard flow control 1149 * state. 1150 */ 1151 if (!ISSET(cflag, CHWFLOW)) { 1152 if (zst->zst_tx_stopped) { 1153 zst->zst_tx_stopped = 0; 1154 zsstart(tp); 1155 } 1156 } 1157 1158 zstty_softint(cs); 1159 1160 return (0); 1161 } 1162 1163 /* 1164 * Compute interupt enable bits and set in the pending bits. Called both 1165 * in zsparam() and when PPS (pulse per second timing) state changes. 1166 * Must be called at splzs(). 1167 */ 1168 static void 1169 zs_maskintr(zst) 1170 struct zstty_softc *zst; 1171 { 1172 struct zs_chanstate *cs = zst->zst_cs; 1173 int tmp15; 1174 1175 cs->cs_rr0_mask = cs->cs_rr0_cts | cs->cs_rr0_dcd; 1176 if (zst->zst_ppsmask != 0) 1177 cs->cs_rr0_mask |= cs->cs_rr0_pps; 1178 tmp15 = cs->cs_preg[15]; 1179 if (ISSET(cs->cs_rr0_mask, ZSRR0_DCD)) 1180 SET(tmp15, ZSWR15_DCD_IE); 1181 else 1182 CLR(tmp15, ZSWR15_DCD_IE); 1183 if (ISSET(cs->cs_rr0_mask, ZSRR0_CTS)) 1184 SET(tmp15, ZSWR15_CTS_IE); 1185 else 1186 CLR(tmp15, ZSWR15_CTS_IE); 1187 cs->cs_preg[15] = tmp15; 1188 } 1189 1190 1191 /* 1192 * Raise or lower modem control (DTR/RTS) signals. If a character is 1193 * in transmission, the change is deferred. 1194 */ 1195 static void 1196 zs_modem(zst, onoff) 1197 struct zstty_softc *zst; 1198 int onoff; 1199 { 1200 struct zs_chanstate *cs = zst->zst_cs; 1201 1202 if (cs->cs_wr5_dtr == 0) 1203 return; 1204 1205 if (onoff) 1206 SET(cs->cs_preg[5], cs->cs_wr5_dtr); 1207 else 1208 CLR(cs->cs_preg[5], cs->cs_wr5_dtr); 1209 1210 if (!cs->cs_heldchange) { 1211 if (zst->zst_tx_busy) { 1212 zst->zst_heldtbc = zst->zst_tbc; 1213 zst->zst_tbc = 0; 1214 cs->cs_heldchange = 1; 1215 } else 1216 zs_loadchannelregs(cs); 1217 } 1218 } 1219 1220 static void 1221 tiocm_to_zs(zst, how, ttybits) 1222 struct zstty_softc *zst; 1223 u_long how; 1224 int ttybits; 1225 { 1226 struct zs_chanstate *cs = zst->zst_cs; 1227 u_char zsbits; 1228 1229 zsbits = 0; 1230 if (ISSET(ttybits, TIOCM_DTR)) 1231 SET(zsbits, ZSWR5_DTR); 1232 if (ISSET(ttybits, TIOCM_RTS)) 1233 SET(zsbits, ZSWR5_RTS); 1234 1235 switch (how) { 1236 case TIOCMBIC: 1237 CLR(cs->cs_preg[5], zsbits); 1238 break; 1239 1240 case TIOCMBIS: 1241 SET(cs->cs_preg[5], zsbits); 1242 break; 1243 1244 case TIOCMSET: 1245 CLR(cs->cs_preg[5], ZSWR5_RTS | ZSWR5_DTR); 1246 SET(cs->cs_preg[5], zsbits); 1247 break; 1248 } 1249 1250 if (!cs->cs_heldchange) { 1251 if (zst->zst_tx_busy) { 1252 zst->zst_heldtbc = zst->zst_tbc; 1253 zst->zst_tbc = 0; 1254 cs->cs_heldchange = 1; 1255 } else 1256 zs_loadchannelregs(cs); 1257 } 1258 } 1259 1260 static int 1261 zs_to_tiocm(zst) 1262 struct zstty_softc *zst; 1263 { 1264 struct zs_chanstate *cs = zst->zst_cs; 1265 u_char zsbits; 1266 int ttybits = 0; 1267 1268 zsbits = cs->cs_preg[5]; 1269 if (ISSET(zsbits, ZSWR5_DTR)) 1270 SET(ttybits, TIOCM_DTR); 1271 if (ISSET(zsbits, ZSWR5_RTS)) 1272 SET(ttybits, TIOCM_RTS); 1273 1274 zsbits = cs->cs_rr0; 1275 if (ISSET(zsbits, ZSRR0_DCD)) 1276 SET(ttybits, TIOCM_CD); 1277 if (ISSET(zsbits, ZSRR0_CTS)) 1278 SET(ttybits, TIOCM_CTS); 1279 1280 return (ttybits); 1281 } 1282 1283 /* 1284 * Try to block or unblock input using hardware flow-control. 1285 * This is called by kern/tty.c if MDMBUF|CRTSCTS is set, and 1286 * if this function returns non-zero, the TS_TBLOCK flag will 1287 * be set or cleared according to the "block" arg passed. 1288 */ 1289 int 1290 zshwiflow(tp, block) 1291 struct tty *tp; 1292 int block; 1293 { 1294 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(tp->t_dev)); 1295 struct zs_chanstate *cs = zst->zst_cs; 1296 int s; 1297 1298 if (cs->cs_wr5_rts == 0) 1299 return (0); 1300 1301 s = splzs(); 1302 if (block) { 1303 if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1304 SET(zst->zst_rx_flags, RX_TTY_BLOCKED); 1305 zs_hwiflow(zst); 1306 } 1307 } else { 1308 if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1309 CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1310 zst->zst_rx_ready = 1; 1311 cs->cs_softreq = 1; 1312 } 1313 if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1314 CLR(zst->zst_rx_flags, RX_TTY_BLOCKED); 1315 zs_hwiflow(zst); 1316 } 1317 } 1318 splx(s); 1319 return (1); 1320 } 1321 1322 /* 1323 * Internal version of zshwiflow 1324 * called at splzs 1325 */ 1326 static void 1327 zs_hwiflow(zst) 1328 struct zstty_softc *zst; 1329 { 1330 struct zs_chanstate *cs = zst->zst_cs; 1331 1332 if (cs->cs_wr5_rts == 0) 1333 return; 1334 1335 if (ISSET(zst->zst_rx_flags, RX_ANY_BLOCK)) { 1336 CLR(cs->cs_preg[5], cs->cs_wr5_rts); 1337 CLR(cs->cs_creg[5], cs->cs_wr5_rts); 1338 } else { 1339 SET(cs->cs_preg[5], cs->cs_wr5_rts); 1340 SET(cs->cs_creg[5], cs->cs_wr5_rts); 1341 } 1342 zs_write_reg(cs, 5, cs->cs_creg[5]); 1343 } 1344 1345 1346 /**************************************************************** 1347 * Interface to the lower layer (zscc) 1348 ****************************************************************/ 1349 1350 #define integrate static inline 1351 integrate void zstty_rxsoft __P((struct zstty_softc *, struct tty *)); 1352 integrate void zstty_txsoft __P((struct zstty_softc *, struct tty *)); 1353 integrate void zstty_stsoft __P((struct zstty_softc *, struct tty *)); 1354 static void zstty_diag __P((void *)); 1355 1356 /* 1357 * receiver ready interrupt. 1358 * called at splzs 1359 */ 1360 static void 1361 zstty_rxint(cs) 1362 struct zs_chanstate *cs; 1363 { 1364 struct zstty_softc *zst = cs->cs_private; 1365 u_char *put, *end; 1366 u_int cc; 1367 u_char rr0, rr1, c; 1368 1369 end = zst->zst_ebuf; 1370 put = zst->zst_rbput; 1371 cc = zst->zst_rbavail; 1372 1373 while (cc > 0) { 1374 /* 1375 * First read the status, because reading the received char 1376 * destroys the status of this char. 1377 */ 1378 rr1 = zs_read_reg(cs, 1); 1379 c = zs_read_data(cs); 1380 1381 if (ISSET(rr1, ZSRR1_FE | ZSRR1_DO | ZSRR1_PE)) { 1382 /* Clear the receive error. */ 1383 zs_write_csr(cs, ZSWR0_RESET_ERRORS); 1384 } 1385 1386 if (ISSET(rr1, ZSRR1_DO)) Debugger(); 1387 put[0] = c; 1388 put[1] = rr1; 1389 put += 2; 1390 if (put >= end) 1391 put = zst->zst_rbuf; 1392 cc--; 1393 1394 rr0 = zs_read_csr(cs); 1395 if (!ISSET(rr0, ZSRR0_RX_READY)) 1396 break; 1397 } 1398 1399 /* 1400 * Current string of incoming characters ended because 1401 * no more data was available or we ran out of space. 1402 * Schedule a receive event if any data was received. 1403 * If we're out of space, turn off receive interrupts. 1404 */ 1405 zst->zst_rbput = put; 1406 zst->zst_rbavail = cc; 1407 if (!ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1408 zst->zst_rx_ready = 1; 1409 cs->cs_softreq = 1; 1410 } 1411 1412 /* 1413 * See if we are in danger of overflowing a buffer. If 1414 * so, use hardware flow control to ease the pressure. 1415 */ 1416 if (!ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED) && 1417 cc < zst->zst_r_hiwat) { 1418 SET(zst->zst_rx_flags, RX_IBUF_BLOCKED); 1419 zs_hwiflow(zst); 1420 } 1421 1422 /* 1423 * If we're out of space, disable receive interrupts 1424 * until the queue has drained a bit. 1425 */ 1426 if (!cc) { 1427 SET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED); 1428 CLR(cs->cs_preg[1], ZSWR1_RIE); 1429 cs->cs_creg[1] = cs->cs_preg[1]; 1430 zs_write_reg(cs, 1, cs->cs_creg[1]); 1431 } 1432 1433 #if 0 1434 printf("%xH%04d\n", zst->zst_rx_flags, zst->zst_rbavail); 1435 #endif 1436 } 1437 1438 /* 1439 * transmitter ready interrupt. (splzs) 1440 */ 1441 static void 1442 zstty_txint(cs) 1443 struct zs_chanstate *cs; 1444 { 1445 struct zstty_softc *zst = cs->cs_private; 1446 1447 /* 1448 * If we've delayed a parameter change, do it now, and restart 1449 * output. 1450 */ 1451 if (cs->cs_heldchange) { 1452 zs_loadchannelregs(cs); 1453 cs->cs_heldchange = 0; 1454 zst->zst_tbc = zst->zst_heldtbc; 1455 zst->zst_heldtbc = 0; 1456 } 1457 1458 /* Output the next character in the buffer, if any. */ 1459 if (zst->zst_tbc > 0) { 1460 zs_write_data(cs, *zst->zst_tba); 1461 zst->zst_tbc--; 1462 zst->zst_tba++; 1463 } else { 1464 /* Disable transmit completion interrupts if necessary. */ 1465 if (ISSET(cs->cs_preg[1], ZSWR1_TIE)) { 1466 CLR(cs->cs_preg[1], ZSWR1_TIE); 1467 cs->cs_creg[1] = cs->cs_preg[1]; 1468 zs_write_reg(cs, 1, cs->cs_creg[1]); 1469 } 1470 if (zst->zst_tx_busy) { 1471 zst->zst_tx_busy = 0; 1472 zst->zst_tx_done = 1; 1473 cs->cs_softreq = 1; 1474 } 1475 } 1476 } 1477 1478 /* 1479 * status change interrupt. (splzs) 1480 */ 1481 static void 1482 zstty_stint(cs, force) 1483 struct zs_chanstate *cs; 1484 int force; 1485 { 1486 struct zstty_softc *zst = cs->cs_private; 1487 u_char rr0, delta; 1488 1489 rr0 = zs_read_csr(cs); 1490 zs_write_csr(cs, ZSWR0_RESET_STATUS); 1491 1492 /* 1493 * Check here for console break, so that we can abort 1494 * even when interrupts are locking up the machine. 1495 */ 1496 if (ISSET(rr0, ZSRR0_BREAK) && 1497 ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE_INPUT)) { 1498 zs_abort(cs); 1499 return; 1500 } 1501 1502 if (!force) 1503 delta = rr0 ^ cs->cs_rr0; 1504 else 1505 delta = cs->cs_rr0_mask; 1506 cs->cs_rr0 = rr0; 1507 1508 if (ISSET(delta, cs->cs_rr0_mask)) { 1509 SET(cs->cs_rr0_delta, delta); 1510 1511 /* 1512 * Pulse-per-second clock signal on edge of DCD? 1513 */ 1514 if (ISSET(delta, zst->zst_ppsmask)) { 1515 struct timeval tv; 1516 if (ISSET(rr0, zst->zst_ppsmask) == zst->zst_ppsassert) { 1517 /* XXX nanotime() */ 1518 microtime(&tv); 1519 TIMEVAL_TO_TIMESPEC(&tv, 1520 &zst->ppsinfo.assert_timestamp); 1521 if (zst->ppsparam.mode & PPS_OFFSETASSERT) { 1522 timespecadd(&zst->ppsinfo.assert_timestamp, 1523 &zst->ppsparam.assert_offset, 1524 &zst->ppsinfo.assert_timestamp); 1525 } 1526 1527 #ifdef PPS_SYNC 1528 if (zst->ppsparam.mode & PPS_HARDPPSONASSERT) 1529 hardpps(&tv, tv.tv_usec); 1530 #endif 1531 zst->ppsinfo.assert_sequence++; 1532 zst->ppsinfo.current_mode = zst->ppsparam.mode; 1533 } else if (ISSET(rr0, zst->zst_ppsmask) == 1534 zst->zst_ppsclear) { 1535 /* XXX nanotime() */ 1536 microtime(&tv); 1537 TIMEVAL_TO_TIMESPEC(&tv, 1538 &zst->ppsinfo.clear_timestamp); 1539 if (zst->ppsparam.mode & PPS_OFFSETCLEAR) { 1540 timespecadd(&zst->ppsinfo.clear_timestamp, 1541 &zst->ppsparam.clear_offset, 1542 &zst->ppsinfo.clear_timestamp); 1543 } 1544 1545 #ifdef PPS_SYNC 1546 if (zst->ppsparam.mode & PPS_HARDPPSONCLEAR) 1547 hardpps(&tv, tv.tv_usec); 1548 #endif 1549 zst->ppsinfo.clear_sequence++; 1550 zst->ppsinfo.current_mode = zst->ppsparam.mode; 1551 } 1552 } 1553 1554 /* 1555 * Stop output immediately if we lose the output 1556 * flow control signal or carrier detect. 1557 */ 1558 if (ISSET(~rr0, cs->cs_rr0_mask)) { 1559 zst->zst_tbc = 0; 1560 zst->zst_heldtbc = 0; 1561 } 1562 1563 zst->zst_st_check = 1; 1564 cs->cs_softreq = 1; 1565 } 1566 } 1567 1568 void 1569 zstty_diag(arg) 1570 void *arg; 1571 { 1572 struct zstty_softc *zst = arg; 1573 int overflows, floods; 1574 int s; 1575 1576 s = splzs(); 1577 overflows = zst->zst_overflows; 1578 zst->zst_overflows = 0; 1579 floods = zst->zst_floods; 1580 zst->zst_floods = 0; 1581 zst->zst_errors = 0; 1582 splx(s); 1583 1584 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1585 zst->zst_dev.dv_xname, 1586 overflows, overflows == 1 ? "" : "s", 1587 floods, floods == 1 ? "" : "s"); 1588 } 1589 1590 integrate void 1591 zstty_rxsoft(zst, tp) 1592 struct zstty_softc *zst; 1593 struct tty *tp; 1594 { 1595 struct zs_chanstate *cs = zst->zst_cs; 1596 int (*rint) __P((int c, struct tty *tp)) = tp->t_linesw->l_rint; 1597 u_char *get, *end; 1598 u_int cc, scc; 1599 u_char rr1; 1600 int code; 1601 int s; 1602 1603 end = zst->zst_ebuf; 1604 get = zst->zst_rbget; 1605 scc = cc = zstty_rbuf_size - zst->zst_rbavail; 1606 1607 if (cc == zstty_rbuf_size) { 1608 zst->zst_floods++; 1609 if (zst->zst_errors++ == 0) 1610 callout_reset(&zst->zst_diag_ch, 60 * hz, 1611 zstty_diag, zst); 1612 } 1613 1614 /* If not yet open, drop the entire buffer content here */ 1615 if (!ISSET(tp->t_state, TS_ISOPEN)) { 1616 get += cc << 1; 1617 if (get >= end) 1618 get -= zstty_rbuf_size << 1; 1619 cc = 0; 1620 } 1621 while (cc) { 1622 code = get[0]; 1623 rr1 = get[1]; 1624 if (ISSET(rr1, ZSRR1_DO | ZSRR1_FE | ZSRR1_PE)) { 1625 if (ISSET(rr1, ZSRR1_DO)) { 1626 zst->zst_overflows++; 1627 if (zst->zst_errors++ == 0) 1628 callout_reset(&zst->zst_diag_ch, 1629 60 * hz, zstty_diag, zst); 1630 } 1631 if (ISSET(rr1, ZSRR1_FE)) 1632 SET(code, TTY_FE); 1633 if (ISSET(rr1, ZSRR1_PE)) 1634 SET(code, TTY_PE); 1635 } 1636 if ((*rint)(code, tp) == -1) { 1637 /* 1638 * The line discipline's buffer is out of space. 1639 */ 1640 if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1641 /* 1642 * We're either not using flow control, or the 1643 * line discipline didn't tell us to block for 1644 * some reason. Either way, we have no way to 1645 * know when there's more space available, so 1646 * just drop the rest of the data. 1647 */ 1648 get += cc << 1; 1649 if (get >= end) 1650 get -= zstty_rbuf_size << 1; 1651 cc = 0; 1652 } else { 1653 /* 1654 * Don't schedule any more receive processing 1655 * until the line discipline tells us there's 1656 * space available (through comhwiflow()). 1657 * Leave the rest of the data in the input 1658 * buffer. 1659 */ 1660 SET(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1661 } 1662 break; 1663 } 1664 get += 2; 1665 if (get >= end) 1666 get = zst->zst_rbuf; 1667 cc--; 1668 } 1669 1670 if (cc != scc) { 1671 zst->zst_rbget = get; 1672 s = splzs(); 1673 cc = zst->zst_rbavail += scc - cc; 1674 /* Buffers should be ok again, release possible block. */ 1675 if (cc >= zst->zst_r_lowat) { 1676 if (ISSET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED)) { 1677 CLR(zst->zst_rx_flags, RX_IBUF_OVERFLOWED); 1678 SET(cs->cs_preg[1], ZSWR1_RIE); 1679 cs->cs_creg[1] = cs->cs_preg[1]; 1680 zs_write_reg(cs, 1, cs->cs_creg[1]); 1681 } 1682 if (ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED)) { 1683 CLR(zst->zst_rx_flags, RX_IBUF_BLOCKED); 1684 zs_hwiflow(zst); 1685 } 1686 } 1687 splx(s); 1688 } 1689 1690 #if 0 1691 printf("%xS%04d\n", zst->zst_rx_flags, zst->zst_rbavail); 1692 #endif 1693 } 1694 1695 integrate void 1696 zstty_txsoft(zst, tp) 1697 struct zstty_softc *zst; 1698 struct tty *tp; 1699 { 1700 1701 CLR(tp->t_state, TS_BUSY); 1702 if (ISSET(tp->t_state, TS_FLUSH)) 1703 CLR(tp->t_state, TS_FLUSH); 1704 else 1705 ndflush(&tp->t_outq, (int)(zst->zst_tba - tp->t_outq.c_cf)); 1706 (*tp->t_linesw->l_start)(tp); 1707 } 1708 1709 integrate void 1710 zstty_stsoft(zst, tp) 1711 struct zstty_softc *zst; 1712 struct tty *tp; 1713 { 1714 struct zs_chanstate *cs = zst->zst_cs; 1715 u_char rr0, delta; 1716 int s; 1717 1718 s = splzs(); 1719 rr0 = cs->cs_rr0; 1720 delta = cs->cs_rr0_delta; 1721 cs->cs_rr0_delta = 0; 1722 splx(s); 1723 1724 if (ISSET(delta, cs->cs_rr0_dcd)) { 1725 /* 1726 * Inform the tty layer that carrier detect changed. 1727 */ 1728 (void) (*tp->t_linesw->l_modem)(tp, ISSET(rr0, ZSRR0_DCD)); 1729 } 1730 1731 if (ISSET(delta, cs->cs_rr0_cts)) { 1732 /* Block or unblock output according to flow control. */ 1733 if (ISSET(rr0, cs->cs_rr0_cts)) { 1734 zst->zst_tx_stopped = 0; 1735 (*tp->t_linesw->l_start)(tp); 1736 } else { 1737 zst->zst_tx_stopped = 1; 1738 } 1739 } 1740 } 1741 1742 /* 1743 * Software interrupt. Called at zssoft 1744 * 1745 * The main job to be done here is to empty the input ring 1746 * by passing its contents up to the tty layer. The ring is 1747 * always emptied during this operation, therefore the ring 1748 * must not be larger than the space after "high water" in 1749 * the tty layer, or the tty layer might drop our input. 1750 * 1751 * Note: an "input blockage" condition is assumed to exist if 1752 * EITHER the TS_TBLOCK flag or zst_rx_blocked flag is set. 1753 */ 1754 static void 1755 zstty_softint(cs) 1756 struct zs_chanstate *cs; 1757 { 1758 struct zstty_softc *zst = cs->cs_private; 1759 struct tty *tp = zst->zst_tty; 1760 int s; 1761 1762 s = spltty(); 1763 1764 if (zst->zst_rx_ready) { 1765 zst->zst_rx_ready = 0; 1766 zstty_rxsoft(zst, tp); 1767 } 1768 1769 if (zst->zst_st_check) { 1770 zst->zst_st_check = 0; 1771 zstty_stsoft(zst, tp); 1772 } 1773 1774 if (zst->zst_tx_done) { 1775 zst->zst_tx_done = 0; 1776 zstty_txsoft(zst, tp); 1777 } 1778 1779 splx(s); 1780 } 1781 1782 struct zsops zsops_tty = { 1783 zstty_rxint, /* receive char available */ 1784 zstty_stint, /* external/status */ 1785 zstty_txint, /* xmit buffer empty */ 1786 zstty_softint, /* process software interrupt */ 1787 }; 1788
Indexes created Mon Sep 29 21:09:56 GMT 2025