z8530tty.c revision 1.74
1 /* $NetBSD: z8530tty.c,v 1.74 2001/03/12 15:46:56 tsutsui 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 zsioctl(dev, cmd, data, flag, p) 690 dev_t dev; 691 u_long cmd; 692 caddr_t data; 693 int flag; 694 struct proc *p; 695 { 696 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 697 struct zs_chanstate *cs = zst->zst_cs; 698 struct tty *tp = zst->zst_tty; 699 int error; 700 int s; 701 702 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, p); 703 if (error >= 0) 704 return (error); 705 706 error = ttioctl(tp, cmd, data, flag, p); 707 if (error >= 0) 708 return (error); 709 710 #ifdef ZS_MD_IOCTL 711 error = ZS_MD_IOCTL; 712 if (error >= 0) 713 return (error); 714 #endif /* ZS_MD_IOCTL */ 715 716 error = 0; 717 718 s = splzs(); 719 720 switch (cmd) { 721 case TIOCSBRK: 722 zs_break(cs, 1); 723 break; 724 725 case TIOCCBRK: 726 zs_break(cs, 0); 727 break; 728 729 case TIOCGFLAGS: 730 *(int *)data = zst->zst_swflags; 731 break; 732 733 case TIOCSFLAGS: 734 error = suser(p->p_ucred, &p->p_acflag); 735 if (error) 736 break; 737 zst->zst_swflags = *(int *)data; 738 break; 739 740 case TIOCSDTR: 741 zs_modem(zst, 1); 742 break; 743 744 case TIOCCDTR: 745 zs_modem(zst, 0); 746 break; 747 748 case TIOCMSET: 749 case TIOCMBIS: 750 case TIOCMBIC: 751 tiocm_to_zs(zst, cmd, *(int *)data); 752 break; 753 754 case TIOCMGET: 755 *(int *)data = zs_to_tiocm(zst); 756 break; 757 758 case PPS_IOC_CREATE: 759 break; 760 761 case PPS_IOC_DESTROY: 762 break; 763 764 case PPS_IOC_GETPARAMS: { 765 pps_params_t *pp; 766 pp = (pps_params_t *)data; 767 *pp = zst->ppsparam; 768 break; 769 } 770 771 case PPS_IOC_SETPARAMS: { 772 pps_params_t *pp; 773 int mode; 774 if (cs->cs_rr0_pps == 0) { 775 error = EINVAL; 776 break; 777 } 778 pp = (pps_params_t *)data; 779 if (pp->mode & ~zsppscap) { 780 error = EINVAL; 781 break; 782 } 783 zst->ppsparam = *pp; 784 /* 785 * compute masks from user-specified timestamp state. 786 */ 787 mode = zst->ppsparam.mode; 788 #ifdef PPS_SYNC 789 if (mode & PPS_HARDPPSONASSERT) { 790 mode |= PPS_CAPTUREASSERT; 791 /* XXX revoke any previous HARDPPS source */ 792 } 793 if (mode & PPS_HARDPPSONCLEAR) { 794 mode |= PPS_CAPTURECLEAR; 795 /* XXX revoke any previous HARDPPS source */ 796 } 797 #endif /* PPS_SYNC */ 798 switch (mode & PPS_CAPTUREBOTH) { 799 case 0: 800 zst->zst_ppsmask = 0; 801 break; 802 803 case PPS_CAPTUREASSERT: 804 zst->zst_ppsmask = ZSRR0_DCD; 805 zst->zst_ppsassert = ZSRR0_DCD; 806 zst->zst_ppsclear = -1; 807 break; 808 809 case PPS_CAPTURECLEAR: 810 zst->zst_ppsmask = ZSRR0_DCD; 811 zst->zst_ppsassert = -1; 812 zst->zst_ppsclear = 0; 813 break; 814 815 case PPS_CAPTUREBOTH: 816 zst->zst_ppsmask = ZSRR0_DCD; 817 zst->zst_ppsassert = ZSRR0_DCD; 818 zst->zst_ppsclear = 0; 819 break; 820 821 default: 822 error = EINVAL; 823 break; 824 } 825 826 /* 827 * Now update interrupts. 828 */ 829 zs_maskintr(zst); 830 /* 831 * If nothing is being transmitted, set up new current values, 832 * else mark them as pending. 833 */ 834 if (!cs->cs_heldchange) { 835 if (zst->zst_tx_busy) { 836 zst->zst_heldtbc = zst->zst_tbc; 837 zst->zst_tbc = 0; 838 cs->cs_heldchange = 1; 839 } else 840 zs_loadchannelregs(cs); 841 } 842 843 break; 844 } 845 846 case PPS_IOC_GETCAP: 847 *(int *)data = zsppscap; 848 break; 849 850 case PPS_IOC_FETCH: { 851 pps_info_t *pi; 852 pi = (pps_info_t *)data; 853 *pi = zst->ppsinfo; 854 break; 855 } 856 857 case TIOCDCDTIMESTAMP: /* XXX old, overloaded API used by xntpd v3 */ 858 if (cs->cs_rr0_pps == 0) { 859 error = EINVAL; 860 break; 861 } 862 /* 863 * Some GPS clocks models use the falling rather than 864 * rising edge as the on-the-second signal. 865 * The old API has no way to specify PPS polarity. 866 */ 867 zst->zst_ppsmask = ZSRR0_DCD; 868 #ifndef PPS_TRAILING_EDGE 869 zst->zst_ppsassert = ZSRR0_DCD; 870 zst->zst_ppsclear = -1; 871 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 872 &zst->ppsinfo.assert_timestamp); 873 #else 874 zst->zst_ppsassert = -1; 875 zst->zst_ppsclear = 01; 876 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 877 &zst->ppsinfo.clear_timestamp); 878 #endif 879 /* 880 * Now update interrupts. 881 */ 882 zs_maskintr(zst); 883 /* 884 * If nothing is being transmitted, set up new current values, 885 * else mark them as pending. 886 */ 887 if (!cs->cs_heldchange) { 888 if (zst->zst_tx_busy) { 889 zst->zst_heldtbc = zst->zst_tbc; 890 zst->zst_tbc = 0; 891 cs->cs_heldchange = 1; 892 } else 893 zs_loadchannelregs(cs); 894 } 895 896 break; 897 898 default: 899 error = ENOTTY; 900 break; 901 } 902 903 splx(s); 904 905 return (error); 906 } 907 908 /* 909 * Start or restart transmission. 910 */ 911 static void 912 zsstart(tp) 913 struct tty *tp; 914 { 915 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(tp->t_dev)); 916 struct zs_chanstate *cs = zst->zst_cs; 917 int s; 918 919 s = spltty(); 920 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 921 goto out; 922 if (zst->zst_tx_stopped) 923 goto out; 924 925 if (tp->t_outq.c_cc <= tp->t_lowat) { 926 if (ISSET(tp->t_state, TS_ASLEEP)) { 927 CLR(tp->t_state, TS_ASLEEP); 928 wakeup((caddr_t)&tp->t_outq); 929 } 930 selwakeup(&tp->t_wsel); 931 if (tp->t_outq.c_cc == 0) 932 goto out; 933 } 934 935 /* Grab the first contiguous region of buffer space. */ 936 { 937 u_char *tba; 938 int tbc; 939 940 tba = tp->t_outq.c_cf; 941 tbc = ndqb(&tp->t_outq, 0); 942 943 (void) splzs(); 944 945 zst->zst_tba = tba; 946 zst->zst_tbc = tbc; 947 } 948 949 SET(tp->t_state, TS_BUSY); 950 zst->zst_tx_busy = 1; 951 952 /* Enable transmit completion interrupts if necessary. */ 953 if (!ISSET(cs->cs_preg[1], ZSWR1_TIE)) { 954 SET(cs->cs_preg[1], ZSWR1_TIE); 955 cs->cs_creg[1] = cs->cs_preg[1]; 956 zs_write_reg(cs, 1, cs->cs_creg[1]); 957 } 958 959 /* Output the first character of the contiguous buffer. */ 960 { 961 zs_write_data(cs, *zst->zst_tba); 962 zst->zst_tbc--; 963 zst->zst_tba++; 964 } 965 out: 966 splx(s); 967 return; 968 } 969 970 /* 971 * Stop output, e.g., for ^S or output flush. 972 */ 973 void 974 zsstop(tp, flag) 975 struct tty *tp; 976 int flag; 977 { 978 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(tp->t_dev)); 979 int s; 980 981 s = splzs(); 982 if (ISSET(tp->t_state, TS_BUSY)) { 983 /* Stop transmitting at the next chunk. */ 984 zst->zst_tbc = 0; 985 zst->zst_heldtbc = 0; 986 if (!ISSET(tp->t_state, TS_TTSTOP)) 987 SET(tp->t_state, TS_FLUSH); 988 } 989 splx(s); 990 } 991 992 /* 993 * Set ZS tty parameters from termios. 994 * XXX - Should just copy the whole termios after 995 * making sure all the changes could be done. 996 */ 997 static int 998 zsparam(tp, t) 999 struct tty *tp; 1000 struct termios *t; 1001 { 1002 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(tp->t_dev)); 1003 struct zs_chanstate *cs = zst->zst_cs; 1004 int ospeed, cflag; 1005 u_char tmp3, tmp4, tmp5; 1006 int s, error; 1007 1008 ospeed = t->c_ospeed; 1009 cflag = t->c_cflag; 1010 1011 /* Check requested parameters. */ 1012 if (ospeed < 0) 1013 return (EINVAL); 1014 if (t->c_ispeed && t->c_ispeed != ospeed) 1015 return (EINVAL); 1016 1017 /* 1018 * For the console, always force CLOCAL and !HUPCL, so that the port 1019 * is always active. 1020 */ 1021 if (ISSET(zst->zst_swflags, TIOCFLAG_SOFTCAR) || 1022 ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 1023 SET(cflag, CLOCAL); 1024 CLR(cflag, HUPCL); 1025 } 1026 1027 /* 1028 * Only whack the UART when params change. 1029 * Some callers need to clear tp->t_ospeed 1030 * to make sure initialization gets done. 1031 */ 1032 if (tp->t_ospeed == ospeed && 1033 tp->t_cflag == cflag) 1034 return (0); 1035 1036 /* 1037 * Call MD functions to deal with changed 1038 * clock modes or H/W flow control modes. 1039 * The BRG divisor is set now. (reg 12,13) 1040 */ 1041 error = zs_set_speed(cs, ospeed); 1042 if (error) 1043 return (error); 1044 error = zs_set_modes(cs, cflag); 1045 if (error) 1046 return (error); 1047 1048 /* 1049 * Block interrupts so that state will not 1050 * be altered until we are done setting it up. 1051 * 1052 * Initial values in cs_preg are set before 1053 * our attach routine is called. The master 1054 * interrupt enable is handled by zsc.c 1055 * 1056 */ 1057 s = splzs(); 1058 1059 /* 1060 * Recalculate which status ints to enable. 1061 */ 1062 zs_maskintr(zst); 1063 1064 /* Recompute character size bits. */ 1065 tmp3 = cs->cs_preg[3]; 1066 tmp5 = cs->cs_preg[5]; 1067 CLR(tmp3, ZSWR3_RXSIZE); 1068 CLR(tmp5, ZSWR5_TXSIZE); 1069 switch (ISSET(cflag, CSIZE)) { 1070 case CS5: 1071 SET(tmp3, ZSWR3_RX_5); 1072 SET(tmp5, ZSWR5_TX_5); 1073 break; 1074 case CS6: 1075 SET(tmp3, ZSWR3_RX_6); 1076 SET(tmp5, ZSWR5_TX_6); 1077 break; 1078 case CS7: 1079 SET(tmp3, ZSWR3_RX_7); 1080 SET(tmp5, ZSWR5_TX_7); 1081 break; 1082 case CS8: 1083 SET(tmp3, ZSWR3_RX_8); 1084 SET(tmp5, ZSWR5_TX_8); 1085 break; 1086 } 1087 cs->cs_preg[3] = tmp3; 1088 cs->cs_preg[5] = tmp5; 1089 1090 /* 1091 * Recompute the stop bits and parity bits. Note that 1092 * zs_set_speed() may have set clock selection bits etc. 1093 * in wr4, so those must preserved. 1094 */ 1095 tmp4 = cs->cs_preg[4]; 1096 CLR(tmp4, ZSWR4_SBMASK | ZSWR4_PARMASK); 1097 if (ISSET(cflag, CSTOPB)) 1098 SET(tmp4, ZSWR4_TWOSB); 1099 else 1100 SET(tmp4, ZSWR4_ONESB); 1101 if (!ISSET(cflag, PARODD)) 1102 SET(tmp4, ZSWR4_EVENP); 1103 if (ISSET(cflag, PARENB)) 1104 SET(tmp4, ZSWR4_PARENB); 1105 cs->cs_preg[4] = tmp4; 1106 1107 /* And copy to tty. */ 1108 tp->t_ispeed = 0; 1109 tp->t_ospeed = ospeed; 1110 tp->t_cflag = cflag; 1111 1112 /* 1113 * If nothing is being transmitted, set up new current values, 1114 * else mark them as pending. 1115 */ 1116 if (!cs->cs_heldchange) { 1117 if (zst->zst_tx_busy) { 1118 zst->zst_heldtbc = zst->zst_tbc; 1119 zst->zst_tbc = 0; 1120 cs->cs_heldchange = 1; 1121 } else 1122 zs_loadchannelregs(cs); 1123 } 1124 1125 /* 1126 * If hardware flow control is disabled, turn off the buffer water 1127 * marks and unblock any soft flow control state. Otherwise, enable 1128 * the water marks. 1129 */ 1130 if (!ISSET(cflag, CHWFLOW)) { 1131 zst->zst_r_hiwat = 0; 1132 zst->zst_r_lowat = 0; 1133 if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1134 CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1135 zst->zst_rx_ready = 1; 1136 cs->cs_softreq = 1; 1137 } 1138 if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 1139 CLR(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 1140 zs_hwiflow(zst); 1141 } 1142 } else { 1143 zst->zst_r_hiwat = zstty_rbuf_hiwat; 1144 zst->zst_r_lowat = zstty_rbuf_lowat; 1145 } 1146 1147 /* 1148 * Force a recheck of the hardware carrier and flow control status, 1149 * since we may have changed which bits we're looking at. 1150 */ 1151 zstty_stint(cs, 1); 1152 1153 splx(s); 1154 1155 /* 1156 * If hardware flow control is disabled, unblock any hard flow control 1157 * state. 1158 */ 1159 if (!ISSET(cflag, CHWFLOW)) { 1160 if (zst->zst_tx_stopped) { 1161 zst->zst_tx_stopped = 0; 1162 zsstart(tp); 1163 } 1164 } 1165 1166 zstty_softint(cs); 1167 1168 return (0); 1169 } 1170 1171 /* 1172 * Compute interupt enable bits and set in the pending bits. Called both 1173 * in zsparam() and when PPS (pulse per second timing) state changes. 1174 * Must be called at splzs(). 1175 */ 1176 static void 1177 zs_maskintr(zst) 1178 struct zstty_softc *zst; 1179 { 1180 struct zs_chanstate *cs = zst->zst_cs; 1181 int tmp15; 1182 1183 cs->cs_rr0_mask = cs->cs_rr0_cts | cs->cs_rr0_dcd; 1184 if (zst->zst_ppsmask != 0) 1185 cs->cs_rr0_mask |= cs->cs_rr0_pps; 1186 tmp15 = cs->cs_preg[15]; 1187 if (ISSET(cs->cs_rr0_mask, ZSRR0_DCD)) 1188 SET(tmp15, ZSWR15_DCD_IE); 1189 else 1190 CLR(tmp15, ZSWR15_DCD_IE); 1191 if (ISSET(cs->cs_rr0_mask, ZSRR0_CTS)) 1192 SET(tmp15, ZSWR15_CTS_IE); 1193 else 1194 CLR(tmp15, ZSWR15_CTS_IE); 1195 cs->cs_preg[15] = tmp15; 1196 } 1197 1198 1199 /* 1200 * Raise or lower modem control (DTR/RTS) signals. If a character is 1201 * in transmission, the change is deferred. 1202 */ 1203 static void 1204 zs_modem(zst, onoff) 1205 struct zstty_softc *zst; 1206 int onoff; 1207 { 1208 struct zs_chanstate *cs = zst->zst_cs; 1209 1210 if (cs->cs_wr5_dtr == 0) 1211 return; 1212 1213 if (onoff) 1214 SET(cs->cs_preg[5], cs->cs_wr5_dtr); 1215 else 1216 CLR(cs->cs_preg[5], cs->cs_wr5_dtr); 1217 1218 if (!cs->cs_heldchange) { 1219 if (zst->zst_tx_busy) { 1220 zst->zst_heldtbc = zst->zst_tbc; 1221 zst->zst_tbc = 0; 1222 cs->cs_heldchange = 1; 1223 } else 1224 zs_loadchannelregs(cs); 1225 } 1226 } 1227 1228 static void 1229 tiocm_to_zs(zst, how, ttybits) 1230 struct zstty_softc *zst; 1231 u_long how; 1232 int ttybits; 1233 { 1234 struct zs_chanstate *cs = zst->zst_cs; 1235 u_char zsbits; 1236 1237 zsbits = 0; 1238 if (ISSET(ttybits, TIOCM_DTR)) 1239 SET(zsbits, ZSWR5_DTR); 1240 if (ISSET(ttybits, TIOCM_RTS)) 1241 SET(zsbits, ZSWR5_RTS); 1242 1243 switch (how) { 1244 case TIOCMBIC: 1245 CLR(cs->cs_preg[5], zsbits); 1246 break; 1247 1248 case TIOCMBIS: 1249 SET(cs->cs_preg[5], zsbits); 1250 break; 1251 1252 case TIOCMSET: 1253 CLR(cs->cs_preg[5], ZSWR5_RTS | ZSWR5_DTR); 1254 SET(cs->cs_preg[5], zsbits); 1255 break; 1256 } 1257 1258 if (!cs->cs_heldchange) { 1259 if (zst->zst_tx_busy) { 1260 zst->zst_heldtbc = zst->zst_tbc; 1261 zst->zst_tbc = 0; 1262 cs->cs_heldchange = 1; 1263 } else 1264 zs_loadchannelregs(cs); 1265 } 1266 } 1267 1268 static int 1269 zs_to_tiocm(zst) 1270 struct zstty_softc *zst; 1271 { 1272 struct zs_chanstate *cs = zst->zst_cs; 1273 u_char zsbits; 1274 int ttybits = 0; 1275 1276 zsbits = cs->cs_preg[5]; 1277 if (ISSET(zsbits, ZSWR5_DTR)) 1278 SET(ttybits, TIOCM_DTR); 1279 if (ISSET(zsbits, ZSWR5_RTS)) 1280 SET(ttybits, TIOCM_RTS); 1281 1282 zsbits = cs->cs_rr0; 1283 if (ISSET(zsbits, ZSRR0_DCD)) 1284 SET(ttybits, TIOCM_CD); 1285 if (ISSET(zsbits, ZSRR0_CTS)) 1286 SET(ttybits, TIOCM_CTS); 1287 1288 return (ttybits); 1289 } 1290 1291 /* 1292 * Try to block or unblock input using hardware flow-control. 1293 * This is called by kern/tty.c if MDMBUF|CRTSCTS is set, and 1294 * if this function returns non-zero, the TS_TBLOCK flag will 1295 * be set or cleared according to the "block" arg passed. 1296 */ 1297 int 1298 zshwiflow(tp, block) 1299 struct tty *tp; 1300 int block; 1301 { 1302 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(tp->t_dev)); 1303 struct zs_chanstate *cs = zst->zst_cs; 1304 int s; 1305 1306 if (cs->cs_wr5_rts == 0) 1307 return (0); 1308 1309 s = splzs(); 1310 if (block) { 1311 if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1312 SET(zst->zst_rx_flags, RX_TTY_BLOCKED); 1313 zs_hwiflow(zst); 1314 } 1315 } else { 1316 if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1317 CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1318 zst->zst_rx_ready = 1; 1319 cs->cs_softreq = 1; 1320 } 1321 if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1322 CLR(zst->zst_rx_flags, RX_TTY_BLOCKED); 1323 zs_hwiflow(zst); 1324 } 1325 } 1326 splx(s); 1327 return (1); 1328 } 1329 1330 /* 1331 * Internal version of zshwiflow 1332 * called at splzs 1333 */ 1334 static void 1335 zs_hwiflow(zst) 1336 struct zstty_softc *zst; 1337 { 1338 struct zs_chanstate *cs = zst->zst_cs; 1339 1340 if (cs->cs_wr5_rts == 0) 1341 return; 1342 1343 if (ISSET(zst->zst_rx_flags, RX_ANY_BLOCK)) { 1344 CLR(cs->cs_preg[5], cs->cs_wr5_rts); 1345 CLR(cs->cs_creg[5], cs->cs_wr5_rts); 1346 } else { 1347 SET(cs->cs_preg[5], cs->cs_wr5_rts); 1348 SET(cs->cs_creg[5], cs->cs_wr5_rts); 1349 } 1350 zs_write_reg(cs, 5, cs->cs_creg[5]); 1351 } 1352 1353 1354 /**************************************************************** 1355 * Interface to the lower layer (zscc) 1356 ****************************************************************/ 1357 1358 #define integrate static inline 1359 integrate void zstty_rxsoft __P((struct zstty_softc *, struct tty *)); 1360 integrate void zstty_txsoft __P((struct zstty_softc *, struct tty *)); 1361 integrate void zstty_stsoft __P((struct zstty_softc *, struct tty *)); 1362 static void zstty_diag __P((void *)); 1363 1364 /* 1365 * receiver ready interrupt. 1366 * called at splzs 1367 */ 1368 static void 1369 zstty_rxint(cs) 1370 struct zs_chanstate *cs; 1371 { 1372 struct zstty_softc *zst = cs->cs_private; 1373 u_char *put, *end; 1374 u_int cc; 1375 u_char rr0, rr1, c; 1376 1377 end = zst->zst_ebuf; 1378 put = zst->zst_rbput; 1379 cc = zst->zst_rbavail; 1380 1381 while (cc > 0) { 1382 /* 1383 * First read the status, because reading the received char 1384 * destroys the status of this char. 1385 */ 1386 rr1 = zs_read_reg(cs, 1); 1387 c = zs_read_data(cs); 1388 1389 if (ISSET(rr1, ZSRR1_FE | ZSRR1_DO | ZSRR1_PE)) { 1390 /* Clear the receive error. */ 1391 zs_write_csr(cs, ZSWR0_RESET_ERRORS); 1392 } 1393 1394 cn_check_magic(zst->zst_tty->t_dev, c, zstty_cnm_state); 1395 put[0] = c; 1396 put[1] = rr1; 1397 put += 2; 1398 if (put >= end) 1399 put = zst->zst_rbuf; 1400 cc--; 1401 1402 rr0 = zs_read_csr(cs); 1403 if (!ISSET(rr0, ZSRR0_RX_READY)) 1404 break; 1405 } 1406 1407 /* 1408 * Current string of incoming characters ended because 1409 * no more data was available or we ran out of space. 1410 * Schedule a receive event if any data was received. 1411 * If we're out of space, turn off receive interrupts. 1412 */ 1413 zst->zst_rbput = put; 1414 zst->zst_rbavail = cc; 1415 if (!ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1416 zst->zst_rx_ready = 1; 1417 cs->cs_softreq = 1; 1418 } 1419 1420 /* 1421 * See if we are in danger of overflowing a buffer. If 1422 * so, use hardware flow control to ease the pressure. 1423 */ 1424 if (!ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED) && 1425 cc < zst->zst_r_hiwat) { 1426 SET(zst->zst_rx_flags, RX_IBUF_BLOCKED); 1427 zs_hwiflow(zst); 1428 } 1429 1430 /* 1431 * If we're out of space, disable receive interrupts 1432 * until the queue has drained a bit. 1433 */ 1434 if (!cc) { 1435 SET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED); 1436 CLR(cs->cs_preg[1], ZSWR1_RIE); 1437 cs->cs_creg[1] = cs->cs_preg[1]; 1438 zs_write_reg(cs, 1, cs->cs_creg[1]); 1439 } 1440 1441 #if 0 1442 printf("%xH%04d\n", zst->zst_rx_flags, zst->zst_rbavail); 1443 #endif 1444 } 1445 1446 /* 1447 * transmitter ready interrupt. (splzs) 1448 */ 1449 static void 1450 zstty_txint(cs) 1451 struct zs_chanstate *cs; 1452 { 1453 struct zstty_softc *zst = cs->cs_private; 1454 1455 /* 1456 * If we've delayed a parameter change, do it now, and restart 1457 * output. 1458 */ 1459 if (cs->cs_heldchange) { 1460 zs_loadchannelregs(cs); 1461 cs->cs_heldchange = 0; 1462 zst->zst_tbc = zst->zst_heldtbc; 1463 zst->zst_heldtbc = 0; 1464 } 1465 1466 /* Output the next character in the buffer, if any. */ 1467 if (zst->zst_tbc > 0) { 1468 zs_write_data(cs, *zst->zst_tba); 1469 zst->zst_tbc--; 1470 zst->zst_tba++; 1471 } else { 1472 /* Disable transmit completion interrupts if necessary. */ 1473 if (ISSET(cs->cs_preg[1], ZSWR1_TIE)) { 1474 CLR(cs->cs_preg[1], ZSWR1_TIE); 1475 cs->cs_creg[1] = cs->cs_preg[1]; 1476 zs_write_reg(cs, 1, cs->cs_creg[1]); 1477 } 1478 if (zst->zst_tx_busy) { 1479 zst->zst_tx_busy = 0; 1480 zst->zst_tx_done = 1; 1481 cs->cs_softreq = 1; 1482 } 1483 } 1484 } 1485 1486 /* 1487 * status change interrupt. (splzs) 1488 */ 1489 static void 1490 zstty_stint(cs, force) 1491 struct zs_chanstate *cs; 1492 int force; 1493 { 1494 struct zstty_softc *zst = cs->cs_private; 1495 u_char rr0, delta; 1496 1497 rr0 = zs_read_csr(cs); 1498 zs_write_csr(cs, ZSWR0_RESET_STATUS); 1499 1500 /* 1501 * Check here for console break, so that we can abort 1502 * even when interrupts are locking up the machine. 1503 */ 1504 if (ISSET(rr0, ZSRR0_BREAK)) 1505 cn_check_magic(zst->zst_tty->t_dev, CNC_BREAK, zstty_cnm_state); 1506 1507 if (!force) 1508 delta = rr0 ^ cs->cs_rr0; 1509 else 1510 delta = cs->cs_rr0_mask; 1511 cs->cs_rr0 = rr0; 1512 1513 if (ISSET(delta, cs->cs_rr0_mask)) { 1514 SET(cs->cs_rr0_delta, delta); 1515 1516 /* 1517 * Pulse-per-second clock signal on edge of DCD? 1518 */ 1519 if (ISSET(delta, zst->zst_ppsmask)) { 1520 struct timeval tv; 1521 if (ISSET(rr0, zst->zst_ppsmask) == zst->zst_ppsassert) { 1522 /* XXX nanotime() */ 1523 microtime(&tv); 1524 TIMEVAL_TO_TIMESPEC(&tv, 1525 &zst->ppsinfo.assert_timestamp); 1526 if (zst->ppsparam.mode & PPS_OFFSETASSERT) { 1527 timespecadd(&zst->ppsinfo.assert_timestamp, 1528 &zst->ppsparam.assert_offset, 1529 &zst->ppsinfo.assert_timestamp); 1530 } 1531 1532 #ifdef PPS_SYNC 1533 if (zst->ppsparam.mode & PPS_HARDPPSONASSERT) 1534 hardpps(&tv, tv.tv_usec); 1535 #endif 1536 zst->ppsinfo.assert_sequence++; 1537 zst->ppsinfo.current_mode = zst->ppsparam.mode; 1538 } else if (ISSET(rr0, zst->zst_ppsmask) == 1539 zst->zst_ppsclear) { 1540 /* XXX nanotime() */ 1541 microtime(&tv); 1542 TIMEVAL_TO_TIMESPEC(&tv, 1543 &zst->ppsinfo.clear_timestamp); 1544 if (zst->ppsparam.mode & PPS_OFFSETCLEAR) { 1545 timespecadd(&zst->ppsinfo.clear_timestamp, 1546 &zst->ppsparam.clear_offset, 1547 &zst->ppsinfo.clear_timestamp); 1548 } 1549 1550 #ifdef PPS_SYNC 1551 if (zst->ppsparam.mode & PPS_HARDPPSONCLEAR) 1552 hardpps(&tv, tv.tv_usec); 1553 #endif 1554 zst->ppsinfo.clear_sequence++; 1555 zst->ppsinfo.current_mode = zst->ppsparam.mode; 1556 } 1557 } 1558 1559 /* 1560 * Stop output immediately if we lose the output 1561 * flow control signal or carrier detect. 1562 */ 1563 if (ISSET(~rr0, cs->cs_rr0_mask)) { 1564 zst->zst_tbc = 0; 1565 zst->zst_heldtbc = 0; 1566 } 1567 1568 zst->zst_st_check = 1; 1569 cs->cs_softreq = 1; 1570 } 1571 } 1572 1573 void 1574 zstty_diag(arg) 1575 void *arg; 1576 { 1577 struct zstty_softc *zst = arg; 1578 int overflows, floods; 1579 int s; 1580 1581 s = splzs(); 1582 overflows = zst->zst_overflows; 1583 zst->zst_overflows = 0; 1584 floods = zst->zst_floods; 1585 zst->zst_floods = 0; 1586 zst->zst_errors = 0; 1587 splx(s); 1588 1589 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1590 zst->zst_dev.dv_xname, 1591 overflows, overflows == 1 ? "" : "s", 1592 floods, floods == 1 ? "" : "s"); 1593 } 1594 1595 integrate void 1596 zstty_rxsoft(zst, tp) 1597 struct zstty_softc *zst; 1598 struct tty *tp; 1599 { 1600 struct zs_chanstate *cs = zst->zst_cs; 1601 int (*rint) __P((int c, struct tty *tp)) = tp->t_linesw->l_rint; 1602 u_char *get, *end; 1603 u_int cc, scc; 1604 u_char rr1; 1605 int code; 1606 int s; 1607 1608 end = zst->zst_ebuf; 1609 get = zst->zst_rbget; 1610 scc = cc = zstty_rbuf_size - zst->zst_rbavail; 1611 1612 if (cc == zstty_rbuf_size) { 1613 zst->zst_floods++; 1614 if (zst->zst_errors++ == 0) 1615 callout_reset(&zst->zst_diag_ch, 60 * hz, 1616 zstty_diag, zst); 1617 } 1618 1619 /* If not yet open, drop the entire buffer content here */ 1620 if (!ISSET(tp->t_state, TS_ISOPEN)) { 1621 get += cc << 1; 1622 if (get >= end) 1623 get -= zstty_rbuf_size << 1; 1624 cc = 0; 1625 } 1626 while (cc) { 1627 code = get[0]; 1628 rr1 = get[1]; 1629 if (ISSET(rr1, ZSRR1_DO | ZSRR1_FE | ZSRR1_PE)) { 1630 if (ISSET(rr1, ZSRR1_DO)) { 1631 zst->zst_overflows++; 1632 if (zst->zst_errors++ == 0) 1633 callout_reset(&zst->zst_diag_ch, 1634 60 * hz, zstty_diag, zst); 1635 } 1636 if (ISSET(rr1, ZSRR1_FE)) 1637 SET(code, TTY_FE); 1638 if (ISSET(rr1, ZSRR1_PE)) 1639 SET(code, TTY_PE); 1640 } 1641 if ((*rint)(code, tp) == -1) { 1642 /* 1643 * The line discipline's buffer is out of space. 1644 */ 1645 if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1646 /* 1647 * We're either not using flow control, or the 1648 * line discipline didn't tell us to block for 1649 * some reason. Either way, we have no way to 1650 * know when there's more space available, so 1651 * just drop the rest of the data. 1652 */ 1653 get += cc << 1; 1654 if (get >= end) 1655 get -= zstty_rbuf_size << 1; 1656 cc = 0; 1657 } else { 1658 /* 1659 * Don't schedule any more receive processing 1660 * until the line discipline tells us there's 1661 * space available (through comhwiflow()). 1662 * Leave the rest of the data in the input 1663 * buffer. 1664 */ 1665 SET(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1666 } 1667 break; 1668 } 1669 get += 2; 1670 if (get >= end) 1671 get = zst->zst_rbuf; 1672 cc--; 1673 } 1674 1675 if (cc != scc) { 1676 zst->zst_rbget = get; 1677 s = splzs(); 1678 cc = zst->zst_rbavail += scc - cc; 1679 /* Buffers should be ok again, release possible block. */ 1680 if (cc >= zst->zst_r_lowat) { 1681 if (ISSET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED)) { 1682 CLR(zst->zst_rx_flags, RX_IBUF_OVERFLOWED); 1683 SET(cs->cs_preg[1], ZSWR1_RIE); 1684 cs->cs_creg[1] = cs->cs_preg[1]; 1685 zs_write_reg(cs, 1, cs->cs_creg[1]); 1686 } 1687 if (ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED)) { 1688 CLR(zst->zst_rx_flags, RX_IBUF_BLOCKED); 1689 zs_hwiflow(zst); 1690 } 1691 } 1692 splx(s); 1693 } 1694 1695 #if 0 1696 printf("%xS%04d\n", zst->zst_rx_flags, zst->zst_rbavail); 1697 #endif 1698 } 1699 1700 integrate void 1701 zstty_txsoft(zst, tp) 1702 struct zstty_softc *zst; 1703 struct tty *tp; 1704 { 1705 1706 CLR(tp->t_state, TS_BUSY); 1707 if (ISSET(tp->t_state, TS_FLUSH)) 1708 CLR(tp->t_state, TS_FLUSH); 1709 else 1710 ndflush(&tp->t_outq, (int)(zst->zst_tba - tp->t_outq.c_cf)); 1711 (*tp->t_linesw->l_start)(tp); 1712 } 1713 1714 integrate void 1715 zstty_stsoft(zst, tp) 1716 struct zstty_softc *zst; 1717 struct tty *tp; 1718 { 1719 struct zs_chanstate *cs = zst->zst_cs; 1720 u_char rr0, delta; 1721 int s; 1722 1723 s = splzs(); 1724 rr0 = cs->cs_rr0; 1725 delta = cs->cs_rr0_delta; 1726 cs->cs_rr0_delta = 0; 1727 splx(s); 1728 1729 if (ISSET(delta, cs->cs_rr0_dcd)) { 1730 /* 1731 * Inform the tty layer that carrier detect changed. 1732 */ 1733 (void) (*tp->t_linesw->l_modem)(tp, ISSET(rr0, ZSRR0_DCD)); 1734 } 1735 1736 if (ISSET(delta, cs->cs_rr0_cts)) { 1737 /* Block or unblock output according to flow control. */ 1738 if (ISSET(rr0, cs->cs_rr0_cts)) { 1739 zst->zst_tx_stopped = 0; 1740 (*tp->t_linesw->l_start)(tp); 1741 } else { 1742 zst->zst_tx_stopped = 1; 1743 } 1744 } 1745 } 1746 1747 /* 1748 * Software interrupt. Called at zssoft 1749 * 1750 * The main job to be done here is to empty the input ring 1751 * by passing its contents up to the tty layer. The ring is 1752 * always emptied during this operation, therefore the ring 1753 * must not be larger than the space after "high water" in 1754 * the tty layer, or the tty layer might drop our input. 1755 * 1756 * Note: an "input blockage" condition is assumed to exist if 1757 * EITHER the TS_TBLOCK flag or zst_rx_blocked flag is set. 1758 */ 1759 static void 1760 zstty_softint(cs) 1761 struct zs_chanstate *cs; 1762 { 1763 struct zstty_softc *zst = cs->cs_private; 1764 struct tty *tp = zst->zst_tty; 1765 int s; 1766 1767 s = spltty(); 1768 1769 if (zst->zst_rx_ready) { 1770 zst->zst_rx_ready = 0; 1771 zstty_rxsoft(zst, tp); 1772 } 1773 1774 if (zst->zst_st_check) { 1775 zst->zst_st_check = 0; 1776 zstty_stsoft(zst, tp); 1777 } 1778 1779 if (zst->zst_tx_done) { 1780 zst->zst_tx_done = 0; 1781 zstty_txsoft(zst, tp); 1782 } 1783 1784 splx(s); 1785 } 1786 1787 struct zsops zsops_tty = { 1788 zstty_rxint, /* receive char available */ 1789 zstty_stint, /* external/status */ 1790 zstty_txint, /* xmit buffer empty */ 1791 zstty_softint, /* process software interrupt */ 1792 }; 1793
Indexes created Mon Sep 29 03:10:08 GMT 2025