z8530tty.c revision 1.75
1 /* $NetBSD: z8530tty.c,v 1.75 2001/05/02 10:32:09 scw 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 static struct cnm_state zstty_cnm_state; 132 /* 133 * Make this an option variable one can patch. 134 * But be warned: this must be a power of 2! 135 */ 136 u_int zstty_rbuf_size = ZSTTY_RING_SIZE; 137 138 /* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */ 139 u_int zstty_rbuf_hiwat = (ZSTTY_RING_SIZE * 1) / 4; 140 u_int zstty_rbuf_lowat = (ZSTTY_RING_SIZE * 3) / 4; 141 142 static int zsppscap = 143 PPS_TSFMT_TSPEC | 144 PPS_CAPTUREASSERT | 145 PPS_CAPTURECLEAR | 146 #ifdef PPS_SYNC 147 PPS_HARDPPSONASSERT | PPS_HARDPPSONCLEAR | 148 #endif /* PPS_SYNC */ 149 PPS_OFFSETASSERT | PPS_OFFSETCLEAR; 150 151 struct zstty_softc { 152 struct device zst_dev; /* required first: base device */ 153 struct tty *zst_tty; 154 struct zs_chanstate *zst_cs; 155 156 struct callout zst_diag_ch; 157 158 u_int zst_overflows, 159 zst_floods, 160 zst_errors; 161 162 int zst_hwflags, /* see z8530var.h */ 163 zst_swflags; /* TIOCFLAG_SOFTCAR, ... <ttycom.h> */ 164 165 u_int zst_r_hiwat, 166 zst_r_lowat; 167 u_char *volatile zst_rbget, 168 *volatile zst_rbput; 169 volatile u_int zst_rbavail; 170 u_char *zst_rbuf, 171 *zst_ebuf; 172 173 /* 174 * The transmit byte count and address are used for pseudo-DMA 175 * output in the hardware interrupt code. PDMA can be suspended 176 * to get pending changes done; heldtbc is used for this. It can 177 * also be stopped for ^S; this sets TS_TTSTOP in tp->t_state. 178 */ 179 u_char *zst_tba; /* transmit buffer address */ 180 u_int zst_tbc, /* transmit byte count */ 181 zst_heldtbc; /* held tbc while xmission stopped */ 182 183 /* Flags to communicate with zstty_softint() */ 184 volatile u_char zst_rx_flags, /* receiver blocked */ 185 #define RX_TTY_BLOCKED 0x01 186 #define RX_TTY_OVERFLOWED 0x02 187 #define RX_IBUF_BLOCKED 0x04 188 #define RX_IBUF_OVERFLOWED 0x08 189 #define RX_ANY_BLOCK 0x0f 190 zst_tx_busy, /* working on an output chunk */ 191 zst_tx_done, /* done with one output chunk */ 192 zst_tx_stopped, /* H/W level stop (lost CTS) */ 193 zst_st_check, /* got a status interrupt */ 194 zst_rx_ready; 195 196 /* PPS signal on DCD, with or without inkernel clock disciplining */ 197 u_char zst_ppsmask; /* pps signal mask */ 198 u_char zst_ppsassert; /* pps leading edge */ 199 u_char zst_ppsclear; /* pps trailing edge */ 200 pps_info_t ppsinfo; 201 pps_params_t ppsparam; 202 }; 203 204 /* Macros to clear/set/test flags. */ 205 #define SET(t, f) (t) |= (f) 206 #define CLR(t, f) (t) &= ~(f) 207 #define ISSET(t, f) ((t) & (f)) 208 209 /* Definition of the driver for autoconfig. */ 210 static int zstty_match(struct device *, struct cfdata *, void *); 211 static void zstty_attach(struct device *, struct device *, void *); 212 213 struct cfattach zstty_ca = { 214 sizeof(struct zstty_softc), zstty_match, zstty_attach 215 }; 216 217 extern struct cfdriver zstty_cd; 218 219 struct zsops zsops_tty; 220 221 /* Routines called from other code. */ 222 cdev_decl(zs); /* open, close, read, write, ioctl, stop, ... */ 223 224 static void zs_shutdown __P((struct zstty_softc *)); 225 static void zsstart __P((struct tty *)); 226 static int zsparam __P((struct tty *, struct termios *)); 227 static void zs_modem __P((struct zstty_softc *, int)); 228 static void tiocm_to_zs __P((struct zstty_softc *, u_long, int)); 229 static int zs_to_tiocm __P((struct zstty_softc *)); 230 static int zshwiflow __P((struct tty *, int)); 231 static void zs_hwiflow __P((struct zstty_softc *)); 232 static void zs_maskintr __P((struct zstty_softc *)); 233 234 /* Low-level routines. */ 235 static void zstty_rxint __P((struct zs_chanstate *)); 236 static void zstty_stint __P((struct zs_chanstate *, int)); 237 static void zstty_txint __P((struct zs_chanstate *)); 238 static void zstty_softint __P((struct zs_chanstate *)); 239 240 #define ZSUNIT(x) (minor(x) & 0x7ffff) 241 #define ZSDIALOUT(x) (minor(x) & 0x80000) 242 243 /* 244 * zstty_match: how is this zs channel configured? 245 */ 246 int 247 zstty_match(parent, cf, aux) 248 struct device *parent; 249 struct cfdata *cf; 250 void *aux; 251 { 252 struct zsc_attach_args *args = aux; 253 254 /* Exact match is better than wildcard. */ 255 if (cf->cf_loc[ZSCCF_CHANNEL] == args->channel) 256 return 2; 257 258 /* This driver accepts wildcard. */ 259 if (cf->cf_loc[ZSCCF_CHANNEL] == ZSCCF_CHANNEL_DEFAULT) 260 return 1; 261 262 return 0; 263 } 264 265 void 266 zstty_attach(parent, self, aux) 267 struct device *parent, *self; 268 void *aux; 269 270 { 271 struct zsc_softc *zsc = (void *) parent; 272 struct zstty_softc *zst = (void *) self; 273 struct cfdata *cf = self->dv_cfdata; 274 struct zsc_attach_args *args = aux; 275 struct zs_chanstate *cs; 276 struct tty *tp; 277 int channel, s, tty_unit; 278 dev_t dev; 279 char *i, *o; 280 281 callout_init(&zst->zst_diag_ch); 282 cn_init_magic(&zstty_cnm_state); 283 284 tty_unit = zst->zst_dev.dv_unit; 285 channel = args->channel; 286 cs = zsc->zsc_cs[channel]; 287 cs->cs_private = zst; 288 cs->cs_ops = &zsops_tty; 289 290 zst->zst_cs = cs; 291 zst->zst_swflags = cf->cf_flags; /* softcar, etc. */ 292 zst->zst_hwflags = args->hwflags; 293 dev = makedev(zs_major, tty_unit); 294 295 if (zst->zst_swflags) 296 printf(" flags 0x%x", zst->zst_swflags); 297 298 /* 299 * Check whether we serve as a console device. 300 * XXX - split console input/output channels aren't 301 * supported yet on /dev/console 302 */ 303 i = o = NULL; 304 if ((zst->zst_hwflags & ZS_HWFLAG_CONSOLE_INPUT) != 0) { 305 i = "input"; 306 if ((args->hwflags & ZS_HWFLAG_USE_CONSDEV) != 0) { 307 args->consdev->cn_dev = dev; 308 cn_tab->cn_pollc = args->consdev->cn_pollc; 309 cn_tab->cn_getc = args->consdev->cn_getc; 310 } 311 cn_tab->cn_dev = dev; 312 /* Set console magic to BREAK */ 313 cn_set_magic("\047\001"); 314 } 315 if ((zst->zst_hwflags & ZS_HWFLAG_CONSOLE_OUTPUT) != 0) { 316 o = "output"; 317 if ((args->hwflags & ZS_HWFLAG_USE_CONSDEV) != 0) { 318 cn_tab->cn_putc = args->consdev->cn_putc; 319 } 320 cn_tab->cn_dev = dev; 321 } 322 if (i != NULL || o != NULL) 323 printf(" (console %s)", i ? (o ? "i/o" : i) : o); 324 325 #ifdef KGDB 326 if (zs_check_kgdb(cs, dev)) { 327 /* 328 * Allow kgdb to "take over" this port. Returns true 329 * if this serial port is in-use by kgdb. 330 */ 331 printf(" (kgdb)\n"); 332 /* 333 * This is the kgdb port (exclusive use) 334 * so skip the normal attach code. 335 */ 336 return; 337 } 338 #endif 339 printf("\n"); 340 341 tp = ttymalloc(); 342 tp->t_dev = dev; 343 tp->t_oproc = zsstart; 344 tp->t_param = zsparam; 345 tp->t_hwiflow = zshwiflow; 346 tty_attach(tp); 347 348 zst->zst_tty = tp; 349 zst->zst_rbuf = malloc(zstty_rbuf_size << 1, M_DEVBUF, M_WAITOK); 350 zst->zst_ebuf = zst->zst_rbuf + (zstty_rbuf_size << 1); 351 /* Disable the high water mark. */ 352 zst->zst_r_hiwat = 0; 353 zst->zst_r_lowat = 0; 354 zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf; 355 zst->zst_rbavail = zstty_rbuf_size; 356 357 /* if there are no enable/disable functions, assume the device 358 is always enabled */ 359 if (!cs->enable) 360 cs->enabled = 1; 361 362 /* 363 * Hardware init 364 */ 365 if (ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 366 /* Call zsparam similar to open. */ 367 struct termios t; 368 369 /* Wait a while for previous console output to complete */ 370 DELAY(10000); 371 372 /* Setup the "new" parameters in t. */ 373 t.c_ispeed = 0; 374 t.c_ospeed = cs->cs_defspeed; 375 t.c_cflag = cs->cs_defcflag; 376 377 s = splzs(); 378 379 /* 380 * Turn on receiver and status interrupts. 381 * We defer the actual write of the register to zsparam(), 382 * but we must make sure status interrupts are turned on by 383 * the time zsparam() reads the initial rr0 state. 384 */ 385 SET(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE); 386 387 splx(s); 388 389 /* Make sure zsparam will see changes. */ 390 tp->t_ospeed = 0; 391 (void) zsparam(tp, &t); 392 393 s = splzs(); 394 395 /* Make sure DTR is on now. */ 396 zs_modem(zst, 1); 397 398 splx(s); 399 } else { 400 /* Not the console; may need reset. */ 401 int reset; 402 403 reset = (channel == 0) ? ZSWR9_A_RESET : ZSWR9_B_RESET; 404 405 s = splzs(); 406 407 zs_write_reg(cs, 9, reset); 408 409 /* Will raise DTR in open. */ 410 zs_modem(zst, 0); 411 412 splx(s); 413 } 414 } 415 416 417 /* 418 * Return pointer to our tty. 419 */ 420 struct tty * 421 zstty(dev) 422 dev_t dev; 423 { 424 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 425 426 return (zst->zst_tty); 427 } 428 429 430 void 431 zs_shutdown(zst) 432 struct zstty_softc *zst; 433 { 434 struct zs_chanstate *cs = zst->zst_cs; 435 struct tty *tp = zst->zst_tty; 436 int s; 437 438 s = splzs(); 439 440 /* If we were asserting flow control, then deassert it. */ 441 SET(zst->zst_rx_flags, RX_IBUF_BLOCKED); 442 zs_hwiflow(zst); 443 444 /* Clear any break condition set with TIOCSBRK. */ 445 zs_break(cs, 0); 446 447 /* Turn off PPS capture on last close. */ 448 zst->zst_ppsmask = 0; 449 zst->ppsparam.mode = 0; 450 451 /* 452 * Hang up if necessary. Wait a bit, so the other side has time to 453 * notice even if we immediately open the port again. 454 */ 455 if (ISSET(tp->t_cflag, HUPCL)) { 456 zs_modem(zst, 0); 457 (void) tsleep(cs, TTIPRI, ttclos, hz); 458 } 459 460 /* Turn off interrupts if not the console. */ 461 if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 462 CLR(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE); 463 cs->cs_creg[1] = cs->cs_preg[1]; 464 zs_write_reg(cs, 1, cs->cs_creg[1]); 465 } 466 467 /* Call the power management hook. */ 468 if (cs->disable) { 469 #ifdef DIAGNOSTIC 470 if (!cs->enabled) 471 panic("zs_shutdown: not enabled?"); 472 #endif 473 (*cs->disable)(zst->zst_cs); 474 } 475 476 splx(s); 477 } 478 479 /* 480 * Open a zs serial (tty) port. 481 */ 482 int 483 zsopen(dev, flags, mode, p) 484 dev_t dev; 485 int flags; 486 int mode; 487 struct proc *p; 488 { 489 struct zstty_softc *zst; 490 struct zs_chanstate *cs; 491 struct tty *tp; 492 int s, s2; 493 int error; 494 495 zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 496 if (zst == NULL) 497 return (ENXIO); 498 499 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(s); 525 printf("%s: device enable failed\n", 526 zst->zst_dev.dv_xname); 527 return (EIO); 528 } 529 } 530 531 /* 532 * Initialize the termios status to the defaults. Add in the 533 * sticky bits from TIOCSFLAGS. 534 */ 535 t.c_ispeed = 0; 536 t.c_ospeed = cs->cs_defspeed; 537 t.c_cflag = cs->cs_defcflag; 538 if (ISSET(zst->zst_swflags, TIOCFLAG_CLOCAL)) 539 SET(t.c_cflag, CLOCAL); 540 if (ISSET(zst->zst_swflags, TIOCFLAG_CRTSCTS)) 541 SET(t.c_cflag, CRTSCTS); 542 if (ISSET(zst->zst_swflags, TIOCFLAG_CDTRCTS)) 543 SET(t.c_cflag, CDTRCTS); 544 if (ISSET(zst->zst_swflags, TIOCFLAG_MDMBUF)) 545 SET(t.c_cflag, MDMBUF); 546 547 s2 = splzs(); 548 549 /* 550 * Turn on receiver and status interrupts. 551 * We defer the actual write of the register to zsparam(), 552 * but we must make sure status interrupts are turned on by 553 * the time zsparam() reads the initial rr0 state. 554 */ 555 SET(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE); 556 557 /* Clear PPS capture state on first open. */ 558 zst->zst_ppsmask = 0; 559 zst->ppsparam.mode = 0; 560 561 splx(s2); 562 563 /* Make sure zsparam will see changes. */ 564 tp->t_ospeed = 0; 565 (void) zsparam(tp, &t); 566 567 /* 568 * Note: zsparam has done: cflag, ispeed, ospeed 569 * so we just need to do: iflag, oflag, lflag, cc 570 * For "raw" mode, just leave all zeros. 571 */ 572 if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_RAW)) { 573 tp->t_iflag = TTYDEF_IFLAG; 574 tp->t_oflag = TTYDEF_OFLAG; 575 tp->t_lflag = TTYDEF_LFLAG; 576 } else { 577 tp->t_iflag = 0; 578 tp->t_oflag = 0; 579 tp->t_lflag = 0; 580 } 581 ttychars(tp); 582 ttsetwater(tp); 583 584 s2 = splzs(); 585 586 /* 587 * Turn on DTR. We must always do this, even if carrier is not 588 * present, because otherwise we'd have to use TIOCSDTR 589 * immediately after setting CLOCAL, which applications do not 590 * expect. We always assert DTR while the device is open 591 * unless explicitly requested to deassert it. 592 */ 593 zs_modem(zst, 1); 594 595 /* Clear the input ring, and unblock. */ 596 zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf; 597 zst->zst_rbavail = zstty_rbuf_size; 598 zs_iflush(cs); 599 CLR(zst->zst_rx_flags, RX_ANY_BLOCK); 600 zs_hwiflow(zst); 601 602 splx(s2); 603 } 604 605 splx(s); 606 607 error = ttyopen(tp, ZSDIALOUT(dev), ISSET(flags, O_NONBLOCK)); 608 if (error) 609 goto bad; 610 611 error = (*tp->t_linesw->l_open)(dev, tp); 612 if (error) 613 goto bad; 614 615 return (0); 616 617 bad: 618 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 619 /* 620 * We failed to open the device, and nobody else had it opened. 621 * Clean up the state as appropriate. 622 */ 623 zs_shutdown(zst); 624 } 625 626 return (error); 627 } 628 629 /* 630 * Close a zs serial port. 631 */ 632 int 633 zsclose(dev, flags, mode, p) 634 dev_t dev; 635 int flags; 636 int mode; 637 struct proc *p; 638 { 639 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 640 struct tty *tp = zst->zst_tty; 641 642 /* XXX This is for cons.c. */ 643 if (!ISSET(tp->t_state, TS_ISOPEN)) 644 return 0; 645 646 (*tp->t_linesw->l_close)(tp, flags); 647 ttyclose(tp); 648 649 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 650 /* 651 * Although we got a last close, the device may still be in 652 * use; e.g. if this was the dialout node, and there are still 653 * processes waiting for carrier on the non-dialout node. 654 */ 655 zs_shutdown(zst); 656 } 657 658 return (0); 659 } 660 661 /* 662 * Read/write zs serial port. 663 */ 664 int 665 zsread(dev, uio, flags) 666 dev_t dev; 667 struct uio *uio; 668 int flags; 669 { 670 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 671 struct tty *tp = zst->zst_tty; 672 673 return ((*tp->t_linesw->l_read)(tp, uio, flags)); 674 } 675 676 int 677 zswrite(dev, uio, flags) 678 dev_t dev; 679 struct uio *uio; 680 int flags; 681 { 682 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 683 struct tty *tp = zst->zst_tty; 684 685 return ((*tp->t_linesw->l_write)(tp, uio, flags)); 686 } 687 688 int 689 zspoll(dev, events, p) 690 dev_t dev; 691 int events; 692 struct proc *p; 693 { 694 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 695 struct tty *tp = zst->zst_tty; 696 697 return ((*tp->t_linesw->l_poll)(tp, events, p)); 698 } 699 700 int 701 zsioctl(dev, cmd, data, flag, p) 702 dev_t dev; 703 u_long cmd; 704 caddr_t data; 705 int flag; 706 struct proc *p; 707 { 708 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 709 struct zs_chanstate *cs = zst->zst_cs; 710 struct tty *tp = zst->zst_tty; 711 int error; 712 int s; 713 714 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, p); 715 if (error >= 0) 716 return (error); 717 718 error = ttioctl(tp, cmd, data, flag, p); 719 if (error >= 0) 720 return (error); 721 722 #ifdef ZS_MD_IOCTL 723 error = ZS_MD_IOCTL; 724 if (error >= 0) 725 return (error); 726 #endif /* ZS_MD_IOCTL */ 727 728 error = 0; 729 730 s = splzs(); 731 732 switch (cmd) { 733 case TIOCSBRK: 734 zs_break(cs, 1); 735 break; 736 737 case TIOCCBRK: 738 zs_break(cs, 0); 739 break; 740 741 case TIOCGFLAGS: 742 *(int *)data = zst->zst_swflags; 743 break; 744 745 case TIOCSFLAGS: 746 error = suser(p->p_ucred, &p->p_acflag); 747 if (error) 748 break; 749 zst->zst_swflags = *(int *)data; 750 break; 751 752 case TIOCSDTR: 753 zs_modem(zst, 1); 754 break; 755 756 case TIOCCDTR: 757 zs_modem(zst, 0); 758 break; 759 760 case TIOCMSET: 761 case TIOCMBIS: 762 case TIOCMBIC: 763 tiocm_to_zs(zst, cmd, *(int *)data); 764 break; 765 766 case TIOCMGET: 767 *(int *)data = zs_to_tiocm(zst); 768 break; 769 770 case PPS_IOC_CREATE: 771 break; 772 773 case PPS_IOC_DESTROY: 774 break; 775 776 case PPS_IOC_GETPARAMS: { 777 pps_params_t *pp; 778 pp = (pps_params_t *)data; 779 *pp = zst->ppsparam; 780 break; 781 } 782 783 case PPS_IOC_SETPARAMS: { 784 pps_params_t *pp; 785 int mode; 786 if (cs->cs_rr0_pps == 0) { 787 error = EINVAL; 788 break; 789 } 790 pp = (pps_params_t *)data; 791 if (pp->mode & ~zsppscap) { 792 error = EINVAL; 793 break; 794 } 795 zst->ppsparam = *pp; 796 /* 797 * compute masks from user-specified timestamp state. 798 */ 799 mode = zst->ppsparam.mode; 800 #ifdef PPS_SYNC 801 if (mode & PPS_HARDPPSONASSERT) { 802 mode |= PPS_CAPTUREASSERT; 803 /* XXX revoke any previous HARDPPS source */ 804 } 805 if (mode & PPS_HARDPPSONCLEAR) { 806 mode |= PPS_CAPTURECLEAR; 807 /* XXX revoke any previous HARDPPS source */ 808 } 809 #endif /* PPS_SYNC */ 810 switch (mode & PPS_CAPTUREBOTH) { 811 case 0: 812 zst->zst_ppsmask = 0; 813 break; 814 815 case PPS_CAPTUREASSERT: 816 zst->zst_ppsmask = ZSRR0_DCD; 817 zst->zst_ppsassert = ZSRR0_DCD; 818 zst->zst_ppsclear = -1; 819 break; 820 821 case PPS_CAPTURECLEAR: 822 zst->zst_ppsmask = ZSRR0_DCD; 823 zst->zst_ppsassert = -1; 824 zst->zst_ppsclear = 0; 825 break; 826 827 case PPS_CAPTUREBOTH: 828 zst->zst_ppsmask = ZSRR0_DCD; 829 zst->zst_ppsassert = ZSRR0_DCD; 830 zst->zst_ppsclear = 0; 831 break; 832 833 default: 834 error = EINVAL; 835 break; 836 } 837 838 /* 839 * Now update interrupts. 840 */ 841 zs_maskintr(zst); 842 /* 843 * If nothing is being transmitted, set up new current values, 844 * else mark them as pending. 845 */ 846 if (!cs->cs_heldchange) { 847 if (zst->zst_tx_busy) { 848 zst->zst_heldtbc = zst->zst_tbc; 849 zst->zst_tbc = 0; 850 cs->cs_heldchange = 1; 851 } else 852 zs_loadchannelregs(cs); 853 } 854 855 break; 856 } 857 858 case PPS_IOC_GETCAP: 859 *(int *)data = zsppscap; 860 break; 861 862 case PPS_IOC_FETCH: { 863 pps_info_t *pi; 864 pi = (pps_info_t *)data; 865 *pi = zst->ppsinfo; 866 break; 867 } 868 869 case TIOCDCDTIMESTAMP: /* XXX old, overloaded API used by xntpd v3 */ 870 if (cs->cs_rr0_pps == 0) { 871 error = EINVAL; 872 break; 873 } 874 /* 875 * Some GPS clocks models use the falling rather than 876 * rising edge as the on-the-second signal. 877 * The old API has no way to specify PPS polarity. 878 */ 879 zst->zst_ppsmask = ZSRR0_DCD; 880 #ifndef PPS_TRAILING_EDGE 881 zst->zst_ppsassert = ZSRR0_DCD; 882 zst->zst_ppsclear = -1; 883 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 884 &zst->ppsinfo.assert_timestamp); 885 #else 886 zst->zst_ppsassert = -1; 887 zst->zst_ppsclear = 01; 888 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 889 &zst->ppsinfo.clear_timestamp); 890 #endif 891 /* 892 * Now update interrupts. 893 */ 894 zs_maskintr(zst); 895 /* 896 * If nothing is being transmitted, set up new current values, 897 * else mark them as pending. 898 */ 899 if (!cs->cs_heldchange) { 900 if (zst->zst_tx_busy) { 901 zst->zst_heldtbc = zst->zst_tbc; 902 zst->zst_tbc = 0; 903 cs->cs_heldchange = 1; 904 } else 905 zs_loadchannelregs(cs); 906 } 907 908 break; 909 910 default: 911 error = ENOTTY; 912 break; 913 } 914 915 splx(s); 916 917 return (error); 918 } 919 920 /* 921 * Start or restart transmission. 922 */ 923 static void 924 zsstart(tp) 925 struct tty *tp; 926 { 927 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(tp->t_dev)); 928 struct zs_chanstate *cs = zst->zst_cs; 929 int s; 930 931 s = spltty(); 932 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 933 goto out; 934 if (zst->zst_tx_stopped) 935 goto out; 936 937 if (tp->t_outq.c_cc <= tp->t_lowat) { 938 if (ISSET(tp->t_state, TS_ASLEEP)) { 939 CLR(tp->t_state, TS_ASLEEP); 940 wakeup((caddr_t)&tp->t_outq); 941 } 942 selwakeup(&tp->t_wsel); 943 if (tp->t_outq.c_cc == 0) 944 goto out; 945 } 946 947 /* Grab the first contiguous region of buffer space. */ 948 { 949 u_char *tba; 950 int tbc; 951 952 tba = tp->t_outq.c_cf; 953 tbc = ndqb(&tp->t_outq, 0); 954 955 (void) splzs(); 956 957 zst->zst_tba = tba; 958 zst->zst_tbc = tbc; 959 } 960 961 SET(tp->t_state, TS_BUSY); 962 zst->zst_tx_busy = 1; 963 964 /* Enable transmit completion interrupts if necessary. */ 965 if (!ISSET(cs->cs_preg[1], ZSWR1_TIE)) { 966 SET(cs->cs_preg[1], ZSWR1_TIE); 967 cs->cs_creg[1] = cs->cs_preg[1]; 968 zs_write_reg(cs, 1, cs->cs_creg[1]); 969 } 970 971 /* Output the first character of the contiguous buffer. */ 972 { 973 zs_write_data(cs, *zst->zst_tba); 974 zst->zst_tbc--; 975 zst->zst_tba++; 976 } 977 out: 978 splx(s); 979 return; 980 } 981 982 /* 983 * Stop output, e.g., for ^S or output flush. 984 */ 985 void 986 zsstop(tp, flag) 987 struct tty *tp; 988 int flag; 989 { 990 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(tp->t_dev)); 991 int s; 992 993 s = splzs(); 994 if (ISSET(tp->t_state, TS_BUSY)) { 995 /* Stop transmitting at the next chunk. */ 996 zst->zst_tbc = 0; 997 zst->zst_heldtbc = 0; 998 if (!ISSET(tp->t_state, TS_TTSTOP)) 999 SET(tp->t_state, TS_FLUSH); 1000 } 1001 splx(s); 1002 } 1003 1004 /* 1005 * Set ZS tty parameters from termios. 1006 * XXX - Should just copy the whole termios after 1007 * making sure all the changes could be done. 1008 */ 1009 static int 1010 zsparam(tp, t) 1011 struct tty *tp; 1012 struct termios *t; 1013 { 1014 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(tp->t_dev)); 1015 struct zs_chanstate *cs = zst->zst_cs; 1016 int ospeed, cflag; 1017 u_char tmp3, tmp4, tmp5; 1018 int s, error; 1019 1020 ospeed = t->c_ospeed; 1021 cflag = t->c_cflag; 1022 1023 /* Check requested parameters. */ 1024 if (ospeed < 0) 1025 return (EINVAL); 1026 if (t->c_ispeed && t->c_ispeed != ospeed) 1027 return (EINVAL); 1028 1029 /* 1030 * For the console, always force CLOCAL and !HUPCL, so that the port 1031 * is always active. 1032 */ 1033 if (ISSET(zst->zst_swflags, TIOCFLAG_SOFTCAR) || 1034 ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 1035 SET(cflag, CLOCAL); 1036 CLR(cflag, HUPCL); 1037 } 1038 1039 /* 1040 * Only whack the UART when params change. 1041 * Some callers need to clear tp->t_ospeed 1042 * to make sure initialization gets done. 1043 */ 1044 if (tp->t_ospeed == ospeed && 1045 tp->t_cflag == cflag) 1046 return (0); 1047 1048 /* 1049 * Call MD functions to deal with changed 1050 * clock modes or H/W flow control modes. 1051 * The BRG divisor is set now. (reg 12,13) 1052 */ 1053 error = zs_set_speed(cs, ospeed); 1054 if (error) 1055 return (error); 1056 error = zs_set_modes(cs, cflag); 1057 if (error) 1058 return (error); 1059 1060 /* 1061 * Block interrupts so that state will not 1062 * be altered until we are done setting it up. 1063 * 1064 * Initial values in cs_preg are set before 1065 * our attach routine is called. The master 1066 * interrupt enable is handled by zsc.c 1067 * 1068 */ 1069 s = splzs(); 1070 1071 /* 1072 * Recalculate which status ints to enable. 1073 */ 1074 zs_maskintr(zst); 1075 1076 /* Recompute character size bits. */ 1077 tmp3 = cs->cs_preg[3]; 1078 tmp5 = cs->cs_preg[5]; 1079 CLR(tmp3, ZSWR3_RXSIZE); 1080 CLR(tmp5, ZSWR5_TXSIZE); 1081 switch (ISSET(cflag, CSIZE)) { 1082 case CS5: 1083 SET(tmp3, ZSWR3_RX_5); 1084 SET(tmp5, ZSWR5_TX_5); 1085 break; 1086 case CS6: 1087 SET(tmp3, ZSWR3_RX_6); 1088 SET(tmp5, ZSWR5_TX_6); 1089 break; 1090 case CS7: 1091 SET(tmp3, ZSWR3_RX_7); 1092 SET(tmp5, ZSWR5_TX_7); 1093 break; 1094 case CS8: 1095 SET(tmp3, ZSWR3_RX_8); 1096 SET(tmp5, ZSWR5_TX_8); 1097 break; 1098 } 1099 cs->cs_preg[3] = tmp3; 1100 cs->cs_preg[5] = tmp5; 1101 1102 /* 1103 * Recompute the stop bits and parity bits. Note that 1104 * zs_set_speed() may have set clock selection bits etc. 1105 * in wr4, so those must preserved. 1106 */ 1107 tmp4 = cs->cs_preg[4]; 1108 CLR(tmp4, ZSWR4_SBMASK | ZSWR4_PARMASK); 1109 if (ISSET(cflag, CSTOPB)) 1110 SET(tmp4, ZSWR4_TWOSB); 1111 else 1112 SET(tmp4, ZSWR4_ONESB); 1113 if (!ISSET(cflag, PARODD)) 1114 SET(tmp4, ZSWR4_EVENP); 1115 if (ISSET(cflag, PARENB)) 1116 SET(tmp4, ZSWR4_PARENB); 1117 cs->cs_preg[4] = tmp4; 1118 1119 /* And copy to tty. */ 1120 tp->t_ispeed = 0; 1121 tp->t_ospeed = ospeed; 1122 tp->t_cflag = cflag; 1123 1124 /* 1125 * If nothing is being transmitted, set up new current values, 1126 * else mark them as pending. 1127 */ 1128 if (!cs->cs_heldchange) { 1129 if (zst->zst_tx_busy) { 1130 zst->zst_heldtbc = zst->zst_tbc; 1131 zst->zst_tbc = 0; 1132 cs->cs_heldchange = 1; 1133 } else 1134 zs_loadchannelregs(cs); 1135 } 1136 1137 /* 1138 * If hardware flow control is disabled, turn off the buffer water 1139 * marks and unblock any soft flow control state. Otherwise, enable 1140 * the water marks. 1141 */ 1142 if (!ISSET(cflag, CHWFLOW)) { 1143 zst->zst_r_hiwat = 0; 1144 zst->zst_r_lowat = 0; 1145 if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1146 CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1147 zst->zst_rx_ready = 1; 1148 cs->cs_softreq = 1; 1149 } 1150 if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 1151 CLR(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 1152 zs_hwiflow(zst); 1153 } 1154 } else { 1155 zst->zst_r_hiwat = zstty_rbuf_hiwat; 1156 zst->zst_r_lowat = zstty_rbuf_lowat; 1157 } 1158 1159 /* 1160 * Force a recheck of the hardware carrier and flow control status, 1161 * since we may have changed which bits we're looking at. 1162 */ 1163 zstty_stint(cs, 1); 1164 1165 splx(s); 1166 1167 /* 1168 * If hardware flow control is disabled, unblock any hard flow control 1169 * state. 1170 */ 1171 if (!ISSET(cflag, CHWFLOW)) { 1172 if (zst->zst_tx_stopped) { 1173 zst->zst_tx_stopped = 0; 1174 zsstart(tp); 1175 } 1176 } 1177 1178 zstty_softint(cs); 1179 1180 return (0); 1181 } 1182 1183 /* 1184 * Compute interupt enable bits and set in the pending bits. Called both 1185 * in zsparam() and when PPS (pulse per second timing) state changes. 1186 * Must be called at splzs(). 1187 */ 1188 static void 1189 zs_maskintr(zst) 1190 struct zstty_softc *zst; 1191 { 1192 struct zs_chanstate *cs = zst->zst_cs; 1193 int tmp15; 1194 1195 cs->cs_rr0_mask = cs->cs_rr0_cts | cs->cs_rr0_dcd; 1196 if (zst->zst_ppsmask != 0) 1197 cs->cs_rr0_mask |= cs->cs_rr0_pps; 1198 tmp15 = cs->cs_preg[15]; 1199 if (ISSET(cs->cs_rr0_mask, ZSRR0_DCD)) 1200 SET(tmp15, ZSWR15_DCD_IE); 1201 else 1202 CLR(tmp15, ZSWR15_DCD_IE); 1203 if (ISSET(cs->cs_rr0_mask, ZSRR0_CTS)) 1204 SET(tmp15, ZSWR15_CTS_IE); 1205 else 1206 CLR(tmp15, ZSWR15_CTS_IE); 1207 cs->cs_preg[15] = tmp15; 1208 } 1209 1210 1211 /* 1212 * Raise or lower modem control (DTR/RTS) signals. If a character is 1213 * in transmission, the change is deferred. 1214 */ 1215 static void 1216 zs_modem(zst, onoff) 1217 struct zstty_softc *zst; 1218 int onoff; 1219 { 1220 struct zs_chanstate *cs = zst->zst_cs; 1221 1222 if (cs->cs_wr5_dtr == 0) 1223 return; 1224 1225 if (onoff) 1226 SET(cs->cs_preg[5], cs->cs_wr5_dtr); 1227 else 1228 CLR(cs->cs_preg[5], cs->cs_wr5_dtr); 1229 1230 if (!cs->cs_heldchange) { 1231 if (zst->zst_tx_busy) { 1232 zst->zst_heldtbc = zst->zst_tbc; 1233 zst->zst_tbc = 0; 1234 cs->cs_heldchange = 1; 1235 } else 1236 zs_loadchannelregs(cs); 1237 } 1238 } 1239 1240 static void 1241 tiocm_to_zs(zst, how, ttybits) 1242 struct zstty_softc *zst; 1243 u_long how; 1244 int ttybits; 1245 { 1246 struct zs_chanstate *cs = zst->zst_cs; 1247 u_char zsbits; 1248 1249 zsbits = 0; 1250 if (ISSET(ttybits, TIOCM_DTR)) 1251 SET(zsbits, ZSWR5_DTR); 1252 if (ISSET(ttybits, TIOCM_RTS)) 1253 SET(zsbits, ZSWR5_RTS); 1254 1255 switch (how) { 1256 case TIOCMBIC: 1257 CLR(cs->cs_preg[5], zsbits); 1258 break; 1259 1260 case TIOCMBIS: 1261 SET(cs->cs_preg[5], zsbits); 1262 break; 1263 1264 case TIOCMSET: 1265 CLR(cs->cs_preg[5], ZSWR5_RTS | ZSWR5_DTR); 1266 SET(cs->cs_preg[5], zsbits); 1267 break; 1268 } 1269 1270 if (!cs->cs_heldchange) { 1271 if (zst->zst_tx_busy) { 1272 zst->zst_heldtbc = zst->zst_tbc; 1273 zst->zst_tbc = 0; 1274 cs->cs_heldchange = 1; 1275 } else 1276 zs_loadchannelregs(cs); 1277 } 1278 } 1279 1280 static int 1281 zs_to_tiocm(zst) 1282 struct zstty_softc *zst; 1283 { 1284 struct zs_chanstate *cs = zst->zst_cs; 1285 u_char zsbits; 1286 int ttybits = 0; 1287 1288 zsbits = cs->cs_preg[5]; 1289 if (ISSET(zsbits, ZSWR5_DTR)) 1290 SET(ttybits, TIOCM_DTR); 1291 if (ISSET(zsbits, ZSWR5_RTS)) 1292 SET(ttybits, TIOCM_RTS); 1293 1294 zsbits = cs->cs_rr0; 1295 if (ISSET(zsbits, ZSRR0_DCD)) 1296 SET(ttybits, TIOCM_CD); 1297 if (ISSET(zsbits, ZSRR0_CTS)) 1298 SET(ttybits, TIOCM_CTS); 1299 1300 return (ttybits); 1301 } 1302 1303 /* 1304 * Try to block or unblock input using hardware flow-control. 1305 * This is called by kern/tty.c if MDMBUF|CRTSCTS is set, and 1306 * if this function returns non-zero, the TS_TBLOCK flag will 1307 * be set or cleared according to the "block" arg passed. 1308 */ 1309 int 1310 zshwiflow(tp, block) 1311 struct tty *tp; 1312 int block; 1313 { 1314 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(tp->t_dev)); 1315 struct zs_chanstate *cs = zst->zst_cs; 1316 int s; 1317 1318 if (cs->cs_wr5_rts == 0) 1319 return (0); 1320 1321 s = splzs(); 1322 if (block) { 1323 if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1324 SET(zst->zst_rx_flags, RX_TTY_BLOCKED); 1325 zs_hwiflow(zst); 1326 } 1327 } else { 1328 if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1329 CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1330 zst->zst_rx_ready = 1; 1331 cs->cs_softreq = 1; 1332 } 1333 if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1334 CLR(zst->zst_rx_flags, RX_TTY_BLOCKED); 1335 zs_hwiflow(zst); 1336 } 1337 } 1338 splx(s); 1339 return (1); 1340 } 1341 1342 /* 1343 * Internal version of zshwiflow 1344 * called at splzs 1345 */ 1346 static void 1347 zs_hwiflow(zst) 1348 struct zstty_softc *zst; 1349 { 1350 struct zs_chanstate *cs = zst->zst_cs; 1351 1352 if (cs->cs_wr5_rts == 0) 1353 return; 1354 1355 if (ISSET(zst->zst_rx_flags, RX_ANY_BLOCK)) { 1356 CLR(cs->cs_preg[5], cs->cs_wr5_rts); 1357 CLR(cs->cs_creg[5], cs->cs_wr5_rts); 1358 } else { 1359 SET(cs->cs_preg[5], cs->cs_wr5_rts); 1360 SET(cs->cs_creg[5], cs->cs_wr5_rts); 1361 } 1362 zs_write_reg(cs, 5, cs->cs_creg[5]); 1363 } 1364 1365 1366 /**************************************************************** 1367 * Interface to the lower layer (zscc) 1368 ****************************************************************/ 1369 1370 #define integrate static inline 1371 integrate void zstty_rxsoft __P((struct zstty_softc *, struct tty *)); 1372 integrate void zstty_txsoft __P((struct zstty_softc *, struct tty *)); 1373 integrate void zstty_stsoft __P((struct zstty_softc *, struct tty *)); 1374 static void zstty_diag __P((void *)); 1375 1376 /* 1377 * receiver ready interrupt. 1378 * called at splzs 1379 */ 1380 static void 1381 zstty_rxint(cs) 1382 struct zs_chanstate *cs; 1383 { 1384 struct zstty_softc *zst = cs->cs_private; 1385 u_char *put, *end; 1386 u_int cc; 1387 u_char rr0, rr1, c; 1388 1389 end = zst->zst_ebuf; 1390 put = zst->zst_rbput; 1391 cc = zst->zst_rbavail; 1392 1393 while (cc > 0) { 1394 /* 1395 * First read the status, because reading the received char 1396 * destroys the status of this char. 1397 */ 1398 rr1 = zs_read_reg(cs, 1); 1399 c = zs_read_data(cs); 1400 1401 if (ISSET(rr1, ZSRR1_FE | ZSRR1_DO | ZSRR1_PE)) { 1402 /* Clear the receive error. */ 1403 zs_write_csr(cs, ZSWR0_RESET_ERRORS); 1404 } 1405 1406 cn_check_magic(zst->zst_tty->t_dev, c, zstty_cnm_state); 1407 put[0] = c; 1408 put[1] = rr1; 1409 put += 2; 1410 if (put >= end) 1411 put = zst->zst_rbuf; 1412 cc--; 1413 1414 rr0 = zs_read_csr(cs); 1415 if (!ISSET(rr0, ZSRR0_RX_READY)) 1416 break; 1417 } 1418 1419 /* 1420 * Current string of incoming characters ended because 1421 * no more data was available or we ran out of space. 1422 * Schedule a receive event if any data was received. 1423 * If we're out of space, turn off receive interrupts. 1424 */ 1425 zst->zst_rbput = put; 1426 zst->zst_rbavail = cc; 1427 if (!ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1428 zst->zst_rx_ready = 1; 1429 cs->cs_softreq = 1; 1430 } 1431 1432 /* 1433 * See if we are in danger of overflowing a buffer. If 1434 * so, use hardware flow control to ease the pressure. 1435 */ 1436 if (!ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED) && 1437 cc < zst->zst_r_hiwat) { 1438 SET(zst->zst_rx_flags, RX_IBUF_BLOCKED); 1439 zs_hwiflow(zst); 1440 } 1441 1442 /* 1443 * If we're out of space, disable receive interrupts 1444 * until the queue has drained a bit. 1445 */ 1446 if (!cc) { 1447 SET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED); 1448 CLR(cs->cs_preg[1], ZSWR1_RIE); 1449 cs->cs_creg[1] = cs->cs_preg[1]; 1450 zs_write_reg(cs, 1, cs->cs_creg[1]); 1451 } 1452 1453 #if 0 1454 printf("%xH%04d\n", zst->zst_rx_flags, zst->zst_rbavail); 1455 #endif 1456 } 1457 1458 /* 1459 * transmitter ready interrupt. (splzs) 1460 */ 1461 static void 1462 zstty_txint(cs) 1463 struct zs_chanstate *cs; 1464 { 1465 struct zstty_softc *zst = cs->cs_private; 1466 1467 /* 1468 * If we've delayed a parameter change, do it now, and restart 1469 * output. 1470 */ 1471 if (cs->cs_heldchange) { 1472 zs_loadchannelregs(cs); 1473 cs->cs_heldchange = 0; 1474 zst->zst_tbc = zst->zst_heldtbc; 1475 zst->zst_heldtbc = 0; 1476 } 1477 1478 /* Output the next character in the buffer, if any. */ 1479 if (zst->zst_tbc > 0) { 1480 zs_write_data(cs, *zst->zst_tba); 1481 zst->zst_tbc--; 1482 zst->zst_tba++; 1483 } else { 1484 /* Disable transmit completion interrupts if necessary. */ 1485 if (ISSET(cs->cs_preg[1], ZSWR1_TIE)) { 1486 CLR(cs->cs_preg[1], ZSWR1_TIE); 1487 cs->cs_creg[1] = cs->cs_preg[1]; 1488 zs_write_reg(cs, 1, cs->cs_creg[1]); 1489 } 1490 if (zst->zst_tx_busy) { 1491 zst->zst_tx_busy = 0; 1492 zst->zst_tx_done = 1; 1493 cs->cs_softreq = 1; 1494 } 1495 } 1496 } 1497 1498 /* 1499 * status change interrupt. (splzs) 1500 */ 1501 static void 1502 zstty_stint(cs, force) 1503 struct zs_chanstate *cs; 1504 int force; 1505 { 1506 struct zstty_softc *zst = cs->cs_private; 1507 u_char rr0, delta; 1508 1509 rr0 = zs_read_csr(cs); 1510 zs_write_csr(cs, ZSWR0_RESET_STATUS); 1511 1512 /* 1513 * Check here for console break, so that we can abort 1514 * even when interrupts are locking up the machine. 1515 */ 1516 if (ISSET(rr0, ZSRR0_BREAK)) 1517 cn_check_magic(zst->zst_tty->t_dev, CNC_BREAK, zstty_cnm_state); 1518 1519 if (!force) 1520 delta = rr0 ^ cs->cs_rr0; 1521 else 1522 delta = cs->cs_rr0_mask; 1523 cs->cs_rr0 = rr0; 1524 1525 if (ISSET(delta, cs->cs_rr0_mask)) { 1526 SET(cs->cs_rr0_delta, delta); 1527 1528 /* 1529 * Pulse-per-second clock signal on edge of DCD? 1530 */ 1531 if (ISSET(delta, zst->zst_ppsmask)) { 1532 struct timeval tv; 1533 if (ISSET(rr0, zst->zst_ppsmask) == zst->zst_ppsassert) { 1534 /* XXX nanotime() */ 1535 microtime(&tv); 1536 TIMEVAL_TO_TIMESPEC(&tv, 1537 &zst->ppsinfo.assert_timestamp); 1538 if (zst->ppsparam.mode & PPS_OFFSETASSERT) { 1539 timespecadd(&zst->ppsinfo.assert_timestamp, 1540 &zst->ppsparam.assert_offset, 1541 &zst->ppsinfo.assert_timestamp); 1542 } 1543 1544 #ifdef PPS_SYNC 1545 if (zst->ppsparam.mode & PPS_HARDPPSONASSERT) 1546 hardpps(&tv, tv.tv_usec); 1547 #endif 1548 zst->ppsinfo.assert_sequence++; 1549 zst->ppsinfo.current_mode = zst->ppsparam.mode; 1550 } else if (ISSET(rr0, zst->zst_ppsmask) == 1551 zst->zst_ppsclear) { 1552 /* XXX nanotime() */ 1553 microtime(&tv); 1554 TIMEVAL_TO_TIMESPEC(&tv, 1555 &zst->ppsinfo.clear_timestamp); 1556 if (zst->ppsparam.mode & PPS_OFFSETCLEAR) { 1557 timespecadd(&zst->ppsinfo.clear_timestamp, 1558 &zst->ppsparam.clear_offset, 1559 &zst->ppsinfo.clear_timestamp); 1560 } 1561 1562 #ifdef PPS_SYNC 1563 if (zst->ppsparam.mode & PPS_HARDPPSONCLEAR) 1564 hardpps(&tv, tv.tv_usec); 1565 #endif 1566 zst->ppsinfo.clear_sequence++; 1567 zst->ppsinfo.current_mode = zst->ppsparam.mode; 1568 } 1569 } 1570 1571 /* 1572 * Stop output immediately if we lose the output 1573 * flow control signal or carrier detect. 1574 */ 1575 if (ISSET(~rr0, cs->cs_rr0_mask)) { 1576 zst->zst_tbc = 0; 1577 zst->zst_heldtbc = 0; 1578 } 1579 1580 zst->zst_st_check = 1; 1581 cs->cs_softreq = 1; 1582 } 1583 } 1584 1585 void 1586 zstty_diag(arg) 1587 void *arg; 1588 { 1589 struct zstty_softc *zst = arg; 1590 int overflows, floods; 1591 int s; 1592 1593 s = splzs(); 1594 overflows = zst->zst_overflows; 1595 zst->zst_overflows = 0; 1596 floods = zst->zst_floods; 1597 zst->zst_floods = 0; 1598 zst->zst_errors = 0; 1599 splx(s); 1600 1601 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1602 zst->zst_dev.dv_xname, 1603 overflows, overflows == 1 ? "" : "s", 1604 floods, floods == 1 ? "" : "s"); 1605 } 1606 1607 integrate void 1608 zstty_rxsoft(zst, tp) 1609 struct zstty_softc *zst; 1610 struct tty *tp; 1611 { 1612 struct zs_chanstate *cs = zst->zst_cs; 1613 int (*rint) __P((int c, struct tty *tp)) = tp->t_linesw->l_rint; 1614 u_char *get, *end; 1615 u_int cc, scc; 1616 u_char rr1; 1617 int code; 1618 int s; 1619 1620 end = zst->zst_ebuf; 1621 get = zst->zst_rbget; 1622 scc = cc = zstty_rbuf_size - zst->zst_rbavail; 1623 1624 if (cc == zstty_rbuf_size) { 1625 zst->zst_floods++; 1626 if (zst->zst_errors++ == 0) 1627 callout_reset(&zst->zst_diag_ch, 60 * hz, 1628 zstty_diag, zst); 1629 } 1630 1631 /* If not yet open, drop the entire buffer content here */ 1632 if (!ISSET(tp->t_state, TS_ISOPEN)) { 1633 get += cc << 1; 1634 if (get >= end) 1635 get -= zstty_rbuf_size << 1; 1636 cc = 0; 1637 } 1638 while (cc) { 1639 code = get[0]; 1640 rr1 = get[1]; 1641 if (ISSET(rr1, ZSRR1_DO | ZSRR1_FE | ZSRR1_PE)) { 1642 if (ISSET(rr1, ZSRR1_DO)) { 1643 zst->zst_overflows++; 1644 if (zst->zst_errors++ == 0) 1645 callout_reset(&zst->zst_diag_ch, 1646 60 * hz, zstty_diag, zst); 1647 } 1648 if (ISSET(rr1, ZSRR1_FE)) 1649 SET(code, TTY_FE); 1650 if (ISSET(rr1, ZSRR1_PE)) 1651 SET(code, TTY_PE); 1652 } 1653 if ((*rint)(code, tp) == -1) { 1654 /* 1655 * The line discipline's buffer is out of space. 1656 */ 1657 if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1658 /* 1659 * We're either not using flow control, or the 1660 * line discipline didn't tell us to block for 1661 * some reason. Either way, we have no way to 1662 * know when there's more space available, so 1663 * just drop the rest of the data. 1664 */ 1665 get += cc << 1; 1666 if (get >= end) 1667 get -= zstty_rbuf_size << 1; 1668 cc = 0; 1669 } else { 1670 /* 1671 * Don't schedule any more receive processing 1672 * until the line discipline tells us there's 1673 * space available (through comhwiflow()). 1674 * Leave the rest of the data in the input 1675 * buffer. 1676 */ 1677 SET(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1678 } 1679 break; 1680 } 1681 get += 2; 1682 if (get >= end) 1683 get = zst->zst_rbuf; 1684 cc--; 1685 } 1686 1687 if (cc != scc) { 1688 zst->zst_rbget = get; 1689 s = splzs(); 1690 cc = zst->zst_rbavail += scc - cc; 1691 /* Buffers should be ok again, release possible block. */ 1692 if (cc >= zst->zst_r_lowat) { 1693 if (ISSET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED)) { 1694 CLR(zst->zst_rx_flags, RX_IBUF_OVERFLOWED); 1695 SET(cs->cs_preg[1], ZSWR1_RIE); 1696 cs->cs_creg[1] = cs->cs_preg[1]; 1697 zs_write_reg(cs, 1, cs->cs_creg[1]); 1698 } 1699 if (ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED)) { 1700 CLR(zst->zst_rx_flags, RX_IBUF_BLOCKED); 1701 zs_hwiflow(zst); 1702 } 1703 } 1704 splx(s); 1705 } 1706 1707 #if 0 1708 printf("%xS%04d\n", zst->zst_rx_flags, zst->zst_rbavail); 1709 #endif 1710 } 1711 1712 integrate void 1713 zstty_txsoft(zst, tp) 1714 struct zstty_softc *zst; 1715 struct tty *tp; 1716 { 1717 1718 CLR(tp->t_state, TS_BUSY); 1719 if (ISSET(tp->t_state, TS_FLUSH)) 1720 CLR(tp->t_state, TS_FLUSH); 1721 else 1722 ndflush(&tp->t_outq, (int)(zst->zst_tba - tp->t_outq.c_cf)); 1723 (*tp->t_linesw->l_start)(tp); 1724 } 1725 1726 integrate void 1727 zstty_stsoft(zst, tp) 1728 struct zstty_softc *zst; 1729 struct tty *tp; 1730 { 1731 struct zs_chanstate *cs = zst->zst_cs; 1732 u_char rr0, delta; 1733 int s; 1734 1735 s = splzs(); 1736 rr0 = cs->cs_rr0; 1737 delta = cs->cs_rr0_delta; 1738 cs->cs_rr0_delta = 0; 1739 splx(s); 1740 1741 if (ISSET(delta, cs->cs_rr0_dcd)) { 1742 /* 1743 * Inform the tty layer that carrier detect changed. 1744 */ 1745 (void) (*tp->t_linesw->l_modem)(tp, ISSET(rr0, ZSRR0_DCD)); 1746 } 1747 1748 if (ISSET(delta, cs->cs_rr0_cts)) { 1749 /* Block or unblock output according to flow control. */ 1750 if (ISSET(rr0, cs->cs_rr0_cts)) { 1751 zst->zst_tx_stopped = 0; 1752 (*tp->t_linesw->l_start)(tp); 1753 } else { 1754 zst->zst_tx_stopped = 1; 1755 } 1756 } 1757 } 1758 1759 /* 1760 * Software interrupt. Called at zssoft 1761 * 1762 * The main job to be done here is to empty the input ring 1763 * by passing its contents up to the tty layer. The ring is 1764 * always emptied during this operation, therefore the ring 1765 * must not be larger than the space after "high water" in 1766 * the tty layer, or the tty layer might drop our input. 1767 * 1768 * Note: an "input blockage" condition is assumed to exist if 1769 * EITHER the TS_TBLOCK flag or zst_rx_blocked flag is set. 1770 */ 1771 static void 1772 zstty_softint(cs) 1773 struct zs_chanstate *cs; 1774 { 1775 struct zstty_softc *zst = cs->cs_private; 1776 struct tty *tp = zst->zst_tty; 1777 int s; 1778 1779 s = spltty(); 1780 1781 if (zst->zst_rx_ready) { 1782 zst->zst_rx_ready = 0; 1783 zstty_rxsoft(zst, tp); 1784 } 1785 1786 if (zst->zst_st_check) { 1787 zst->zst_st_check = 0; 1788 zstty_stsoft(zst, tp); 1789 } 1790 1791 if (zst->zst_tx_done) { 1792 zst->zst_tx_done = 0; 1793 zstty_txsoft(zst, tp); 1794 } 1795 1796 splx(s); 1797 } 1798 1799 struct zsops zsops_tty = { 1800 zstty_rxint, /* receive char available */ 1801 zstty_stint, /* external/status */ 1802 zstty_txint, /* xmit buffer empty */ 1803 zstty_softint, /* process software interrupt */ 1804 }; 1805
Indexes created Sat Sep 27 14:09:57 GMT 2025