z8530tty.c revision 1.93
1 /* $NetBSD: z8530tty.c,v 1.93 2003/12/04 13:57:30 keihan 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) 1992, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * This software was developed by the Computer Systems Engineering group 38 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 39 * contributed to Berkeley. 40 * 41 * All advertising materials mentioning features or use of this software 42 * must display the following acknowledgement: 43 * This product includes software developed by the University of 44 * California, Lawrence Berkeley Laboratory. 45 * 46 * Redistribution and use in source and binary forms, with or without 47 * modification, are permitted provided that the following conditions 48 * are met: 49 * 1. Redistributions of source code must retain the above copyright 50 * notice, this list of conditions and the following disclaimer. 51 * 2. Redistributions in binary form must reproduce the above copyright 52 * notice, this list of conditions and the following disclaimer in the 53 * documentation and/or other materials provided with the distribution. 54 * 3. Neither the name of the University nor the names of its contributors 55 * may be used to endorse or promote products derived from this software 56 * without specific prior written permission. 57 * 58 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 59 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 60 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 61 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 62 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 63 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 64 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 65 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 66 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 67 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 68 * SUCH DAMAGE. 69 * 70 * @(#)zs.c 8.1 (Berkeley) 7/19/93 71 */ 72 73 /* 74 * Copyright (c) 1994 Gordon W. Ross 75 * 76 * This software was developed by the Computer Systems Engineering group 77 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 78 * contributed to Berkeley. 79 * 80 * All advertising materials mentioning features or use of this software 81 * must display the following acknowledgement: 82 * This product includes software developed by the University of 83 * California, Lawrence Berkeley Laboratory. 84 * 85 * Redistribution and use in source and binary forms, with or without 86 * modification, are permitted provided that the following conditions 87 * are met: 88 * 1. Redistributions of source code must retain the above copyright 89 * notice, this list of conditions and the following disclaimer. 90 * 2. Redistributions in binary form must reproduce the above copyright 91 * notice, this list of conditions and the following disclaimer in the 92 * documentation and/or other materials provided with the distribution. 93 * 3. All advertising materials mentioning features or use of this software 94 * must display the following acknowledgement: 95 * This product includes software developed by the University of 96 * California, Berkeley and its contributors. 97 * 4. Neither the name of the University nor the names of its contributors 98 * may be used to endorse or promote products derived from this software 99 * without specific prior written permission. 100 * 101 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 102 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 103 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 104 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 105 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 106 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 107 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 108 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 109 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 110 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 111 * SUCH DAMAGE. 112 * 113 * @(#)zs.c 8.1 (Berkeley) 7/19/93 114 */ 115 116 /* 117 * Zilog Z8530 Dual UART driver (tty interface) 118 * 119 * This is the "slave" driver that will be attached to 120 * the "zsc" driver for plain "tty" async. serial lines. 121 * 122 * Credits, history: 123 * 124 * The original version of this code was the sparc/dev/zs.c driver 125 * as distributed with the Berkeley 4.4 Lite release. Since then, 126 * Gordon Ross reorganized the code into the current parent/child 127 * driver scheme, separating the Sun keyboard and mouse support 128 * into independent child drivers. 129 * 130 * RTS/CTS flow-control support was a collaboration of: 131 * Gordon Ross <gwr (at) NetBSD.org>, 132 * Bill Studenmund <wrstuden (at) loki.stanford.edu> 133 * Ian Dall <Ian.Dall (at) dsto.defence.gov.au> 134 * 135 * The driver was massively overhauled in November 1997 by Charles Hannum, 136 * fixing *many* bugs, and substantially improving performance. 137 */ 138 139 #include <sys/cdefs.h> 140 __KERNEL_RCSID(0, "$NetBSD: z8530tty.c,v 1.93 2003/12/04 13:57:30 keihan Exp $"); 141 142 #include "opt_kgdb.h" 143 144 #include <sys/param.h> 145 #include <sys/systm.h> 146 #include <sys/proc.h> 147 #include <sys/device.h> 148 #include <sys/conf.h> 149 #include <sys/file.h> 150 #include <sys/ioctl.h> 151 #include <sys/malloc.h> 152 #include <sys/timepps.h> 153 #include <sys/tty.h> 154 #include <sys/time.h> 155 #include <sys/kernel.h> 156 #include <sys/syslog.h> 157 158 #include <dev/ic/z8530reg.h> 159 #include <machine/z8530var.h> 160 161 #include <dev/cons.h> 162 163 #include "locators.h" 164 165 /* 166 * How many input characters we can buffer. 167 * The port-specific var.h may override this. 168 * Note: must be a power of two! 169 */ 170 #ifndef ZSTTY_RING_SIZE 171 #define ZSTTY_RING_SIZE 2048 172 #endif 173 174 static struct cnm_state zstty_cnm_state; 175 /* 176 * Make this an option variable one can patch. 177 * But be warned: this must be a power of 2! 178 */ 179 u_int zstty_rbuf_size = ZSTTY_RING_SIZE; 180 181 /* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */ 182 u_int zstty_rbuf_hiwat = (ZSTTY_RING_SIZE * 1) / 4; 183 u_int zstty_rbuf_lowat = (ZSTTY_RING_SIZE * 3) / 4; 184 185 static int zsppscap = 186 PPS_TSFMT_TSPEC | 187 PPS_CAPTUREASSERT | 188 PPS_CAPTURECLEAR | 189 #ifdef PPS_SYNC 190 PPS_HARDPPSONASSERT | PPS_HARDPPSONCLEAR | 191 #endif /* PPS_SYNC */ 192 PPS_OFFSETASSERT | PPS_OFFSETCLEAR; 193 194 struct zstty_softc { 195 struct device zst_dev; /* required first: base device */ 196 struct tty *zst_tty; 197 struct zs_chanstate *zst_cs; 198 199 struct callout zst_diag_ch; 200 201 u_int zst_overflows, 202 zst_floods, 203 zst_errors; 204 205 int zst_hwflags, /* see z8530var.h */ 206 zst_swflags; /* TIOCFLAG_SOFTCAR, ... <ttycom.h> */ 207 208 u_int zst_r_hiwat, 209 zst_r_lowat; 210 u_char *volatile zst_rbget, 211 *volatile zst_rbput; 212 volatile u_int zst_rbavail; 213 u_char *zst_rbuf, 214 *zst_ebuf; 215 216 /* 217 * The transmit byte count and address are used for pseudo-DMA 218 * output in the hardware interrupt code. PDMA can be suspended 219 * to get pending changes done; heldtbc is used for this. It can 220 * also be stopped for ^S; this sets TS_TTSTOP in tp->t_state. 221 */ 222 u_char *zst_tba; /* transmit buffer address */ 223 u_int zst_tbc, /* transmit byte count */ 224 zst_heldtbc; /* held tbc while xmission stopped */ 225 226 /* Flags to communicate with zstty_softint() */ 227 volatile u_char zst_rx_flags, /* receiver blocked */ 228 #define RX_TTY_BLOCKED 0x01 229 #define RX_TTY_OVERFLOWED 0x02 230 #define RX_IBUF_BLOCKED 0x04 231 #define RX_IBUF_OVERFLOWED 0x08 232 #define RX_ANY_BLOCK 0x0f 233 zst_tx_busy, /* working on an output chunk */ 234 zst_tx_done, /* done with one output chunk */ 235 zst_tx_stopped, /* H/W level stop (lost CTS) */ 236 zst_st_check, /* got a status interrupt */ 237 zst_rx_ready; 238 239 /* PPS signal on DCD, with or without inkernel clock disciplining */ 240 u_char zst_ppsmask; /* pps signal mask */ 241 u_char zst_ppsassert; /* pps leading edge */ 242 u_char zst_ppsclear; /* pps trailing edge */ 243 pps_info_t ppsinfo; 244 pps_params_t ppsparam; 245 }; 246 247 /* Macros to clear/set/test flags. */ 248 #define SET(t, f) (t) |= (f) 249 #define CLR(t, f) (t) &= ~(f) 250 #define ISSET(t, f) ((t) & (f)) 251 252 /* Definition of the driver for autoconfig. */ 253 static int zstty_match(struct device *, struct cfdata *, void *); 254 static void zstty_attach(struct device *, struct device *, void *); 255 256 CFATTACH_DECL(zstty, sizeof(struct zstty_softc), 257 zstty_match, zstty_attach, NULL, NULL); 258 259 extern struct cfdriver zstty_cd; 260 261 dev_type_open(zsopen); 262 dev_type_close(zsclose); 263 dev_type_read(zsread); 264 dev_type_write(zswrite); 265 dev_type_ioctl(zsioctl); 266 dev_type_stop(zsstop); 267 dev_type_tty(zstty); 268 dev_type_poll(zspoll); 269 270 const struct cdevsw zstty_cdevsw = { 271 zsopen, zsclose, zsread, zswrite, zsioctl, 272 zsstop, zstty, zspoll, nommap, ttykqfilter, D_TTY 273 }; 274 275 struct zsops zsops_tty; 276 277 static void zs_shutdown __P((struct zstty_softc *)); 278 static void zsstart __P((struct tty *)); 279 static int zsparam __P((struct tty *, struct termios *)); 280 static void zs_modem __P((struct zstty_softc *, int)); 281 static void tiocm_to_zs __P((struct zstty_softc *, u_long, int)); 282 static int zs_to_tiocm __P((struct zstty_softc *)); 283 static int zshwiflow __P((struct tty *, int)); 284 static void zs_hwiflow __P((struct zstty_softc *)); 285 static void zs_maskintr __P((struct zstty_softc *)); 286 287 /* Low-level routines. */ 288 static void zstty_rxint __P((struct zs_chanstate *)); 289 static void zstty_stint __P((struct zs_chanstate *, int)); 290 static void zstty_txint __P((struct zs_chanstate *)); 291 static void zstty_softint __P((struct zs_chanstate *)); 292 293 #define ZSUNIT(x) (minor(x) & 0x7ffff) 294 #define ZSDIALOUT(x) (minor(x) & 0x80000) 295 296 /* 297 * zstty_match: how is this zs channel configured? 298 */ 299 int 300 zstty_match(parent, cf, aux) 301 struct device *parent; 302 struct cfdata *cf; 303 void *aux; 304 { 305 struct zsc_attach_args *args = aux; 306 307 /* Exact match is better than wildcard. */ 308 if (cf->cf_loc[ZSCCF_CHANNEL] == args->channel) 309 return 2; 310 311 /* This driver accepts wildcard. */ 312 if (cf->cf_loc[ZSCCF_CHANNEL] == ZSCCF_CHANNEL_DEFAULT) 313 return 1; 314 315 return 0; 316 } 317 318 void 319 zstty_attach(parent, self, aux) 320 struct device *parent, *self; 321 void *aux; 322 323 { 324 struct zsc_softc *zsc = (void *) parent; 325 struct zstty_softc *zst = (void *) self; 326 struct cfdata *cf = self->dv_cfdata; 327 struct zsc_attach_args *args = aux; 328 struct zs_chanstate *cs; 329 struct tty *tp; 330 int channel, s, tty_unit; 331 dev_t dev; 332 char *i, *o; 333 int dtr_on; 334 int resetbit; 335 336 callout_init(&zst->zst_diag_ch); 337 cn_init_magic(&zstty_cnm_state); 338 339 tty_unit = zst->zst_dev.dv_unit; 340 channel = args->channel; 341 cs = zsc->zsc_cs[channel]; 342 cs->cs_private = zst; 343 cs->cs_ops = &zsops_tty; 344 345 zst->zst_cs = cs; 346 zst->zst_swflags = cf->cf_flags; /* softcar, etc. */ 347 zst->zst_hwflags = args->hwflags; 348 dev = makedev(cdevsw_lookup_major(&zstty_cdevsw), tty_unit); 349 350 if (zst->zst_swflags) 351 printf(" flags 0x%x", zst->zst_swflags); 352 353 /* 354 * Check whether we serve as a console device. 355 * XXX - split console input/output channels aren't 356 * supported yet on /dev/console 357 */ 358 i = o = NULL; 359 if ((zst->zst_hwflags & ZS_HWFLAG_CONSOLE_INPUT) != 0) { 360 i = "input"; 361 if ((args->hwflags & ZS_HWFLAG_USE_CONSDEV) != 0) { 362 args->consdev->cn_dev = dev; 363 cn_tab->cn_pollc = args->consdev->cn_pollc; 364 cn_tab->cn_getc = args->consdev->cn_getc; 365 } 366 cn_tab->cn_dev = dev; 367 /* Set console magic to BREAK */ 368 cn_set_magic("\047\001"); 369 } 370 if ((zst->zst_hwflags & ZS_HWFLAG_CONSOLE_OUTPUT) != 0) { 371 o = "output"; 372 if ((args->hwflags & ZS_HWFLAG_USE_CONSDEV) != 0) { 373 cn_tab->cn_putc = args->consdev->cn_putc; 374 } 375 cn_tab->cn_dev = dev; 376 } 377 if (i != NULL || o != NULL) 378 printf(" (console %s)", i ? (o ? "i/o" : i) : o); 379 380 #ifdef KGDB 381 if (zs_check_kgdb(cs, dev)) { 382 /* 383 * Allow kgdb to "take over" this port. Returns true 384 * if this serial port is in-use by kgdb. 385 */ 386 printf(" (kgdb)\n"); 387 /* 388 * This is the kgdb port (exclusive use) 389 * so skip the normal attach code. 390 */ 391 return; 392 } 393 #endif 394 printf("\n"); 395 396 tp = ttymalloc(); 397 tp->t_dev = dev; 398 tp->t_oproc = zsstart; 399 tp->t_param = zsparam; 400 tp->t_hwiflow = zshwiflow; 401 tty_attach(tp); 402 403 zst->zst_tty = tp; 404 zst->zst_rbuf = malloc(zstty_rbuf_size << 1, M_DEVBUF, M_WAITOK); 405 zst->zst_ebuf = zst->zst_rbuf + (zstty_rbuf_size << 1); 406 /* Disable the high water mark. */ 407 zst->zst_r_hiwat = 0; 408 zst->zst_r_lowat = 0; 409 zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf; 410 zst->zst_rbavail = zstty_rbuf_size; 411 412 /* if there are no enable/disable functions, assume the device 413 is always enabled */ 414 if (!cs->enable) 415 cs->enabled = 1; 416 417 /* 418 * Hardware init 419 */ 420 dtr_on = 0; 421 resetbit = 0; 422 if (ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 423 /* Call zsparam similar to open. */ 424 struct termios t; 425 426 /* Wait a while for previous console output to complete */ 427 DELAY(10000); 428 429 /* Setup the "new" parameters in t. */ 430 t.c_ispeed = 0; 431 t.c_ospeed = cs->cs_defspeed; 432 t.c_cflag = cs->cs_defcflag; 433 434 /* 435 * Turn on receiver and status interrupts. 436 * We defer the actual write of the register to zsparam(), 437 * but we must make sure status interrupts are turned on by 438 * the time zsparam() reads the initial rr0 state. 439 */ 440 SET(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE); 441 442 /* Make sure zsparam will see changes. */ 443 tp->t_ospeed = 0; 444 (void) zsparam(tp, &t); 445 446 /* Make sure DTR is on now. */ 447 dtr_on = 1; 448 449 } else if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_NORESET)) { 450 /* Not the console; may need reset. */ 451 resetbit = (channel == 0) ? ZSWR9_A_RESET : ZSWR9_B_RESET; 452 } 453 454 s = splzs(); 455 simple_lock(&cs->cs_lock); 456 if (resetbit) 457 zs_write_reg(cs, 9, resetbit); 458 zs_modem(zst, dtr_on); 459 simple_unlock(&cs->cs_lock); 460 splx(s); 461 } 462 463 464 /* 465 * Return pointer to our tty. 466 */ 467 struct tty * 468 zstty(dev) 469 dev_t dev; 470 { 471 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 472 473 return (zst->zst_tty); 474 } 475 476 477 void 478 zs_shutdown(zst) 479 struct zstty_softc *zst; 480 { 481 struct zs_chanstate *cs = zst->zst_cs; 482 struct tty *tp = zst->zst_tty; 483 int s; 484 485 s = splzs(); 486 simple_lock(&cs->cs_lock); 487 488 /* If we were asserting flow control, then deassert it. */ 489 SET(zst->zst_rx_flags, RX_IBUF_BLOCKED); 490 zs_hwiflow(zst); 491 492 /* Clear any break condition set with TIOCSBRK. */ 493 zs_break(cs, 0); 494 495 /* Turn off PPS capture on last close. */ 496 zst->zst_ppsmask = 0; 497 zst->ppsparam.mode = 0; 498 499 /* 500 * Hang up if necessary. Wait a bit, so the other side has time to 501 * notice even if we immediately open the port again. 502 */ 503 if (ISSET(tp->t_cflag, HUPCL)) { 504 zs_modem(zst, 0); 505 simple_unlock(&cs->cs_lock); 506 splx(s); 507 /* 508 * XXX - another process is not prevented from opening 509 * the device during our sleep. 510 */ 511 (void) tsleep(cs, TTIPRI, ttclos, hz); 512 /* Re-check state in case we were opened during our sleep */ 513 if (ISSET(tp->t_state, TS_ISOPEN) || tp->t_wopen != 0) 514 return; 515 516 s = splzs(); 517 simple_lock(&cs->cs_lock); 518 } 519 520 /* Turn off interrupts if not the console. */ 521 if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 522 CLR(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE); 523 cs->cs_creg[1] = cs->cs_preg[1]; 524 zs_write_reg(cs, 1, cs->cs_creg[1]); 525 } 526 527 /* Call the power management hook. */ 528 if (cs->disable) { 529 #ifdef DIAGNOSTIC 530 if (!cs->enabled) 531 panic("zs_shutdown: not enabled?"); 532 #endif 533 (*cs->disable)(zst->zst_cs); 534 } 535 536 simple_unlock(&cs->cs_lock); 537 splx(s); 538 } 539 540 /* 541 * Open a zs serial (tty) port. 542 */ 543 int 544 zsopen(dev, flags, mode, p) 545 dev_t dev; 546 int flags; 547 int mode; 548 struct proc *p; 549 { 550 struct zstty_softc *zst; 551 struct zs_chanstate *cs; 552 struct tty *tp; 553 int s, s2; 554 int error; 555 556 zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 557 if (zst == NULL) 558 return (ENXIO); 559 560 tp = zst->zst_tty; 561 cs = zst->zst_cs; 562 563 /* If KGDB took the line, then tp==NULL */ 564 if (tp == NULL) 565 return (EBUSY); 566 567 if (ISSET(tp->t_state, TS_ISOPEN) && 568 ISSET(tp->t_state, TS_XCLUDE) && 569 p->p_ucred->cr_uid != 0) 570 return (EBUSY); 571 572 s = spltty(); 573 574 /* 575 * Do the following iff this is a first open. 576 */ 577 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 578 struct termios t; 579 580 tp->t_dev = dev; 581 582 /* Call the power management hook. */ 583 if (cs->enable) { 584 if ((*cs->enable)(cs)) { 585 splx(s); 586 printf("%s: device enable failed\n", 587 zst->zst_dev.dv_xname); 588 return (EIO); 589 } 590 } 591 592 /* 593 * Initialize the termios status to the defaults. Add in the 594 * sticky bits from TIOCSFLAGS. 595 */ 596 t.c_ispeed = 0; 597 t.c_ospeed = cs->cs_defspeed; 598 t.c_cflag = cs->cs_defcflag; 599 if (ISSET(zst->zst_swflags, TIOCFLAG_CLOCAL)) 600 SET(t.c_cflag, CLOCAL); 601 if (ISSET(zst->zst_swflags, TIOCFLAG_CRTSCTS)) 602 SET(t.c_cflag, CRTSCTS); 603 if (ISSET(zst->zst_swflags, TIOCFLAG_CDTRCTS)) 604 SET(t.c_cflag, CDTRCTS); 605 if (ISSET(zst->zst_swflags, TIOCFLAG_MDMBUF)) 606 SET(t.c_cflag, MDMBUF); 607 608 s2 = splzs(); 609 simple_lock(&cs->cs_lock); 610 611 /* 612 * Turn on receiver and status interrupts. 613 * We defer the actual write of the register to zsparam(), 614 * but we must make sure status interrupts are turned on by 615 * the time zsparam() reads the initial rr0 state. 616 */ 617 SET(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE); 618 619 /* Clear PPS capture state on first open. */ 620 zst->zst_ppsmask = 0; 621 zst->ppsparam.mode = 0; 622 623 simple_unlock(&cs->cs_lock); 624 splx(s2); 625 626 /* Make sure zsparam will see changes. */ 627 tp->t_ospeed = 0; 628 (void) zsparam(tp, &t); 629 630 /* 631 * Note: zsparam has done: cflag, ispeed, ospeed 632 * so we just need to do: iflag, oflag, lflag, cc 633 * For "raw" mode, just leave all zeros. 634 */ 635 if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_RAW)) { 636 tp->t_iflag = TTYDEF_IFLAG; 637 tp->t_oflag = TTYDEF_OFLAG; 638 tp->t_lflag = TTYDEF_LFLAG; 639 } else { 640 tp->t_iflag = 0; 641 tp->t_oflag = 0; 642 tp->t_lflag = 0; 643 } 644 ttychars(tp); 645 ttsetwater(tp); 646 647 s2 = splzs(); 648 simple_lock(&cs->cs_lock); 649 650 /* 651 * Turn on DTR. We must always do this, even if carrier is not 652 * present, because otherwise we'd have to use TIOCSDTR 653 * immediately after setting CLOCAL, which applications do not 654 * expect. We always assert DTR while the device is open 655 * unless explicitly requested to deassert it. 656 */ 657 zs_modem(zst, 1); 658 659 /* Clear the input ring, and unblock. */ 660 zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf; 661 zst->zst_rbavail = zstty_rbuf_size; 662 zs_iflush(cs); 663 CLR(zst->zst_rx_flags, RX_ANY_BLOCK); 664 zs_hwiflow(zst); 665 666 simple_unlock(&cs->cs_lock); 667 splx(s2); 668 } 669 670 splx(s); 671 672 error = ttyopen(tp, ZSDIALOUT(dev), ISSET(flags, O_NONBLOCK)); 673 if (error) 674 goto bad; 675 676 error = (*tp->t_linesw->l_open)(dev, tp); 677 if (error) 678 goto bad; 679 680 return (0); 681 682 bad: 683 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 684 /* 685 * We failed to open the device, and nobody else had it opened. 686 * Clean up the state as appropriate. 687 */ 688 zs_shutdown(zst); 689 } 690 691 return (error); 692 } 693 694 /* 695 * Close a zs serial port. 696 */ 697 int 698 zsclose(dev, flags, mode, p) 699 dev_t dev; 700 int flags; 701 int mode; 702 struct proc *p; 703 { 704 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 705 struct tty *tp = zst->zst_tty; 706 707 /* XXX This is for cons.c. */ 708 if (!ISSET(tp->t_state, TS_ISOPEN)) 709 return 0; 710 711 (*tp->t_linesw->l_close)(tp, flags); 712 ttyclose(tp); 713 714 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 715 /* 716 * Although we got a last close, the device may still be in 717 * use; e.g. if this was the dialout node, and there are still 718 * processes waiting for carrier on the non-dialout node. 719 */ 720 zs_shutdown(zst); 721 } 722 723 return (0); 724 } 725 726 /* 727 * Read/write zs serial port. 728 */ 729 int 730 zsread(dev, uio, flags) 731 dev_t dev; 732 struct uio *uio; 733 int flags; 734 { 735 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 736 struct tty *tp = zst->zst_tty; 737 738 return ((*tp->t_linesw->l_read)(tp, uio, flags)); 739 } 740 741 int 742 zswrite(dev, uio, flags) 743 dev_t dev; 744 struct uio *uio; 745 int flags; 746 { 747 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 748 struct tty *tp = zst->zst_tty; 749 750 return ((*tp->t_linesw->l_write)(tp, uio, flags)); 751 } 752 753 int 754 zspoll(dev, events, p) 755 dev_t dev; 756 int events; 757 struct proc *p; 758 { 759 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 760 struct tty *tp = zst->zst_tty; 761 762 return ((*tp->t_linesw->l_poll)(tp, events, p)); 763 } 764 765 int 766 zsioctl(dev, cmd, data, flag, p) 767 dev_t dev; 768 u_long cmd; 769 caddr_t data; 770 int flag; 771 struct proc *p; 772 { 773 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(dev)); 774 struct zs_chanstate *cs = zst->zst_cs; 775 struct tty *tp = zst->zst_tty; 776 int error; 777 int s; 778 779 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, p); 780 if (error != EPASSTHROUGH) 781 return (error); 782 783 error = ttioctl(tp, cmd, data, flag, p); 784 if (error != EPASSTHROUGH) 785 return (error); 786 787 #ifdef ZS_MD_IOCTL 788 error = ZS_MD_IOCTL(cs, cmd, data); 789 if (error != EPASSTHROUGH) 790 return (error); 791 #endif /* ZS_MD_IOCTL */ 792 793 error = 0; 794 795 s = splzs(); 796 simple_lock(&cs->cs_lock); 797 798 switch (cmd) { 799 case TIOCSBRK: 800 zs_break(cs, 1); 801 break; 802 803 case TIOCCBRK: 804 zs_break(cs, 0); 805 break; 806 807 case TIOCGFLAGS: 808 *(int *)data = zst->zst_swflags; 809 break; 810 811 case TIOCSFLAGS: 812 error = suser(p->p_ucred, &p->p_acflag); 813 if (error) 814 break; 815 zst->zst_swflags = *(int *)data; 816 break; 817 818 case TIOCSDTR: 819 zs_modem(zst, 1); 820 break; 821 822 case TIOCCDTR: 823 zs_modem(zst, 0); 824 break; 825 826 case TIOCMSET: 827 case TIOCMBIS: 828 case TIOCMBIC: 829 tiocm_to_zs(zst, cmd, *(int *)data); 830 break; 831 832 case TIOCMGET: 833 *(int *)data = zs_to_tiocm(zst); 834 break; 835 836 case PPS_IOC_CREATE: 837 break; 838 839 case PPS_IOC_DESTROY: 840 break; 841 842 case PPS_IOC_GETPARAMS: { 843 pps_params_t *pp; 844 pp = (pps_params_t *)data; 845 *pp = zst->ppsparam; 846 break; 847 } 848 849 case PPS_IOC_SETPARAMS: { 850 pps_params_t *pp; 851 int mode; 852 if (cs->cs_rr0_pps == 0) { 853 error = EINVAL; 854 break; 855 } 856 pp = (pps_params_t *)data; 857 if (pp->mode & ~zsppscap) { 858 error = EINVAL; 859 break; 860 } 861 zst->ppsparam = *pp; 862 /* 863 * compute masks from user-specified timestamp state. 864 */ 865 mode = zst->ppsparam.mode; 866 #ifdef PPS_SYNC 867 if (mode & PPS_HARDPPSONASSERT) { 868 mode |= PPS_CAPTUREASSERT; 869 /* XXX revoke any previous HARDPPS source */ 870 } 871 if (mode & PPS_HARDPPSONCLEAR) { 872 mode |= PPS_CAPTURECLEAR; 873 /* XXX revoke any previous HARDPPS source */ 874 } 875 #endif /* PPS_SYNC */ 876 switch (mode & PPS_CAPTUREBOTH) { 877 case 0: 878 zst->zst_ppsmask = 0; 879 break; 880 881 case PPS_CAPTUREASSERT: 882 zst->zst_ppsmask = ZSRR0_DCD; 883 zst->zst_ppsassert = ZSRR0_DCD; 884 zst->zst_ppsclear = -1; 885 break; 886 887 case PPS_CAPTURECLEAR: 888 zst->zst_ppsmask = ZSRR0_DCD; 889 zst->zst_ppsassert = -1; 890 zst->zst_ppsclear = 0; 891 break; 892 893 case PPS_CAPTUREBOTH: 894 zst->zst_ppsmask = ZSRR0_DCD; 895 zst->zst_ppsassert = ZSRR0_DCD; 896 zst->zst_ppsclear = 0; 897 break; 898 899 default: 900 error = EINVAL; 901 break; 902 } 903 904 /* 905 * Now update interrupts. 906 */ 907 zs_maskintr(zst); 908 /* 909 * If nothing is being transmitted, set up new current values, 910 * else mark them as pending. 911 */ 912 if (!cs->cs_heldchange) { 913 if (zst->zst_tx_busy) { 914 zst->zst_heldtbc = zst->zst_tbc; 915 zst->zst_tbc = 0; 916 cs->cs_heldchange = 1; 917 } else 918 zs_loadchannelregs(cs); 919 } 920 921 break; 922 } 923 924 case PPS_IOC_GETCAP: 925 *(int *)data = zsppscap; 926 break; 927 928 case PPS_IOC_FETCH: { 929 pps_info_t *pi; 930 pi = (pps_info_t *)data; 931 *pi = zst->ppsinfo; 932 break; 933 } 934 935 case TIOCDCDTIMESTAMP: /* XXX old, overloaded API used by xntpd v3 */ 936 if (cs->cs_rr0_pps == 0) { 937 error = EINVAL; 938 break; 939 } 940 /* 941 * Some GPS clocks models use the falling rather than 942 * rising edge as the on-the-second signal. 943 * The old API has no way to specify PPS polarity. 944 */ 945 zst->zst_ppsmask = ZSRR0_DCD; 946 #ifndef PPS_TRAILING_EDGE 947 zst->zst_ppsassert = ZSRR0_DCD; 948 zst->zst_ppsclear = -1; 949 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 950 &zst->ppsinfo.assert_timestamp); 951 #else 952 zst->zst_ppsassert = -1; 953 zst->zst_ppsclear = 01; 954 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 955 &zst->ppsinfo.clear_timestamp); 956 #endif 957 /* 958 * Now update interrupts. 959 */ 960 zs_maskintr(zst); 961 /* 962 * If nothing is being transmitted, set up new current values, 963 * else mark them as pending. 964 */ 965 if (!cs->cs_heldchange) { 966 if (zst->zst_tx_busy) { 967 zst->zst_heldtbc = zst->zst_tbc; 968 zst->zst_tbc = 0; 969 cs->cs_heldchange = 1; 970 } else 971 zs_loadchannelregs(cs); 972 } 973 974 break; 975 976 default: 977 error = EPASSTHROUGH; 978 break; 979 } 980 981 simple_unlock(&cs->cs_lock); 982 splx(s); 983 984 return (error); 985 } 986 987 /* 988 * Start or restart transmission. 989 */ 990 static void 991 zsstart(tp) 992 struct tty *tp; 993 { 994 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(tp->t_dev)); 995 struct zs_chanstate *cs = zst->zst_cs; 996 int s; 997 998 s = spltty(); 999 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 1000 goto out; 1001 if (zst->zst_tx_stopped) 1002 goto out; 1003 1004 if (tp->t_outq.c_cc <= tp->t_lowat) { 1005 if (ISSET(tp->t_state, TS_ASLEEP)) { 1006 CLR(tp->t_state, TS_ASLEEP); 1007 wakeup((caddr_t)&tp->t_outq); 1008 } 1009 selwakeup(&tp->t_wsel); 1010 if (tp->t_outq.c_cc == 0) 1011 goto out; 1012 } 1013 1014 /* Grab the first contiguous region of buffer space. */ 1015 { 1016 u_char *tba; 1017 int tbc; 1018 1019 tba = tp->t_outq.c_cf; 1020 tbc = ndqb(&tp->t_outq, 0); 1021 1022 (void) splzs(); 1023 simple_lock(&cs->cs_lock); 1024 1025 zst->zst_tba = tba; 1026 zst->zst_tbc = tbc; 1027 } 1028 1029 SET(tp->t_state, TS_BUSY); 1030 zst->zst_tx_busy = 1; 1031 1032 /* Enable transmit completion interrupts if necessary. */ 1033 if (!ISSET(cs->cs_preg[1], ZSWR1_TIE)) { 1034 SET(cs->cs_preg[1], ZSWR1_TIE); 1035 cs->cs_creg[1] = cs->cs_preg[1]; 1036 zs_write_reg(cs, 1, cs->cs_creg[1]); 1037 } 1038 1039 /* Output the first character of the contiguous buffer. */ 1040 { 1041 zs_write_data(cs, *zst->zst_tba); 1042 zst->zst_tbc--; 1043 zst->zst_tba++; 1044 } 1045 simple_unlock(&cs->cs_lock); 1046 out: 1047 splx(s); 1048 return; 1049 } 1050 1051 /* 1052 * Stop output, e.g., for ^S or output flush. 1053 */ 1054 void 1055 zsstop(tp, flag) 1056 struct tty *tp; 1057 int flag; 1058 { 1059 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(tp->t_dev)); 1060 int s; 1061 1062 s = splzs(); 1063 if (ISSET(tp->t_state, TS_BUSY)) { 1064 /* Stop transmitting at the next chunk. */ 1065 zst->zst_tbc = 0; 1066 zst->zst_heldtbc = 0; 1067 if (!ISSET(tp->t_state, TS_TTSTOP)) 1068 SET(tp->t_state, TS_FLUSH); 1069 } 1070 splx(s); 1071 } 1072 1073 /* 1074 * Set ZS tty parameters from termios. 1075 * XXX - Should just copy the whole termios after 1076 * making sure all the changes could be done. 1077 */ 1078 static int 1079 zsparam(tp, t) 1080 struct tty *tp; 1081 struct termios *t; 1082 { 1083 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(tp->t_dev)); 1084 struct zs_chanstate *cs = zst->zst_cs; 1085 int ospeed; 1086 tcflag_t cflag; 1087 u_char tmp3, tmp4, tmp5; 1088 int s, error; 1089 1090 ospeed = t->c_ospeed; 1091 cflag = t->c_cflag; 1092 1093 /* Check requested parameters. */ 1094 if (ospeed < 0) 1095 return (EINVAL); 1096 if (t->c_ispeed && t->c_ispeed != ospeed) 1097 return (EINVAL); 1098 1099 /* 1100 * For the console, always force CLOCAL and !HUPCL, so that the port 1101 * is always active. 1102 */ 1103 if (ISSET(zst->zst_swflags, TIOCFLAG_SOFTCAR) || 1104 ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 1105 SET(cflag, CLOCAL); 1106 CLR(cflag, HUPCL); 1107 } 1108 1109 /* 1110 * Only whack the UART when params change. 1111 * Some callers need to clear tp->t_ospeed 1112 * to make sure initialization gets done. 1113 */ 1114 if (tp->t_ospeed == ospeed && 1115 tp->t_cflag == cflag) 1116 return (0); 1117 1118 /* 1119 * Call MD functions to deal with changed 1120 * clock modes or H/W flow control modes. 1121 * The BRG divisor is set now. (reg 12,13) 1122 */ 1123 error = zs_set_speed(cs, ospeed); 1124 if (error) 1125 return (error); 1126 error = zs_set_modes(cs, cflag); 1127 if (error) 1128 return (error); 1129 1130 /* 1131 * Block interrupts so that state will not 1132 * be altered until we are done setting it up. 1133 * 1134 * Initial values in cs_preg are set before 1135 * our attach routine is called. The master 1136 * interrupt enable is handled by zsc.c 1137 * 1138 */ 1139 s = splzs(); 1140 simple_lock(&cs->cs_lock); 1141 1142 /* 1143 * Recalculate which status ints to enable. 1144 */ 1145 zs_maskintr(zst); 1146 1147 /* Recompute character size bits. */ 1148 tmp3 = cs->cs_preg[3]; 1149 tmp5 = cs->cs_preg[5]; 1150 CLR(tmp3, ZSWR3_RXSIZE); 1151 CLR(tmp5, ZSWR5_TXSIZE); 1152 switch (ISSET(cflag, CSIZE)) { 1153 case CS5: 1154 SET(tmp3, ZSWR3_RX_5); 1155 SET(tmp5, ZSWR5_TX_5); 1156 break; 1157 case CS6: 1158 SET(tmp3, ZSWR3_RX_6); 1159 SET(tmp5, ZSWR5_TX_6); 1160 break; 1161 case CS7: 1162 SET(tmp3, ZSWR3_RX_7); 1163 SET(tmp5, ZSWR5_TX_7); 1164 break; 1165 case CS8: 1166 SET(tmp3, ZSWR3_RX_8); 1167 SET(tmp5, ZSWR5_TX_8); 1168 break; 1169 } 1170 cs->cs_preg[3] = tmp3; 1171 cs->cs_preg[5] = tmp5; 1172 1173 /* 1174 * Recompute the stop bits and parity bits. Note that 1175 * zs_set_speed() may have set clock selection bits etc. 1176 * in wr4, so those must preserved. 1177 */ 1178 tmp4 = cs->cs_preg[4]; 1179 CLR(tmp4, ZSWR4_SBMASK | ZSWR4_PARMASK); 1180 if (ISSET(cflag, CSTOPB)) 1181 SET(tmp4, ZSWR4_TWOSB); 1182 else 1183 SET(tmp4, ZSWR4_ONESB); 1184 if (!ISSET(cflag, PARODD)) 1185 SET(tmp4, ZSWR4_EVENP); 1186 if (ISSET(cflag, PARENB)) 1187 SET(tmp4, ZSWR4_PARENB); 1188 cs->cs_preg[4] = tmp4; 1189 1190 /* And copy to tty. */ 1191 tp->t_ispeed = 0; 1192 tp->t_ospeed = ospeed; 1193 tp->t_cflag = cflag; 1194 1195 /* 1196 * If nothing is being transmitted, set up new current values, 1197 * else mark them as pending. 1198 */ 1199 if (!cs->cs_heldchange) { 1200 if (zst->zst_tx_busy) { 1201 zst->zst_heldtbc = zst->zst_tbc; 1202 zst->zst_tbc = 0; 1203 cs->cs_heldchange = 1; 1204 } else 1205 zs_loadchannelregs(cs); 1206 } 1207 1208 /* 1209 * If hardware flow control is disabled, turn off the buffer water 1210 * marks and unblock any soft flow control state. Otherwise, enable 1211 * the water marks. 1212 */ 1213 if (!ISSET(cflag, CHWFLOW)) { 1214 zst->zst_r_hiwat = 0; 1215 zst->zst_r_lowat = 0; 1216 if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1217 CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1218 zst->zst_rx_ready = 1; 1219 cs->cs_softreq = 1; 1220 } 1221 if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 1222 CLR(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 1223 zs_hwiflow(zst); 1224 } 1225 } else { 1226 zst->zst_r_hiwat = zstty_rbuf_hiwat; 1227 zst->zst_r_lowat = zstty_rbuf_lowat; 1228 } 1229 1230 /* 1231 * Force a recheck of the hardware carrier and flow control status, 1232 * since we may have changed which bits we're looking at. 1233 */ 1234 zstty_stint(cs, 1); 1235 1236 simple_unlock(&cs->cs_lock); 1237 splx(s); 1238 1239 /* 1240 * If hardware flow control is disabled, unblock any hard flow control 1241 * state. 1242 */ 1243 if (!ISSET(cflag, CHWFLOW)) { 1244 if (zst->zst_tx_stopped) { 1245 zst->zst_tx_stopped = 0; 1246 zsstart(tp); 1247 } 1248 } 1249 1250 zstty_softint(cs); 1251 1252 return (0); 1253 } 1254 1255 /* 1256 * Compute interrupt enable bits and set in the pending bits. Called both 1257 * in zsparam() and when PPS (pulse per second timing) state changes. 1258 * Must be called at splzs(). 1259 */ 1260 static void 1261 zs_maskintr(zst) 1262 struct zstty_softc *zst; 1263 { 1264 struct zs_chanstate *cs = zst->zst_cs; 1265 int tmp15; 1266 1267 cs->cs_rr0_mask = cs->cs_rr0_cts | cs->cs_rr0_dcd; 1268 if (zst->zst_ppsmask != 0) 1269 cs->cs_rr0_mask |= cs->cs_rr0_pps; 1270 tmp15 = cs->cs_preg[15]; 1271 if (ISSET(cs->cs_rr0_mask, ZSRR0_DCD)) 1272 SET(tmp15, ZSWR15_DCD_IE); 1273 else 1274 CLR(tmp15, ZSWR15_DCD_IE); 1275 if (ISSET(cs->cs_rr0_mask, ZSRR0_CTS)) 1276 SET(tmp15, ZSWR15_CTS_IE); 1277 else 1278 CLR(tmp15, ZSWR15_CTS_IE); 1279 cs->cs_preg[15] = tmp15; 1280 } 1281 1282 1283 /* 1284 * Raise or lower modem control (DTR/RTS) signals. If a character is 1285 * in transmission, the change is deferred. 1286 * Called at splzs() and with the channel lock held. 1287 */ 1288 static void 1289 zs_modem(zst, onoff) 1290 struct zstty_softc *zst; 1291 int onoff; 1292 { 1293 struct zs_chanstate *cs = zst->zst_cs, *ccs; 1294 1295 if (cs->cs_wr5_dtr == 0) 1296 return; 1297 1298 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs); 1299 1300 if (onoff) 1301 SET(ccs->cs_preg[5], cs->cs_wr5_dtr); 1302 else 1303 CLR(ccs->cs_preg[5], cs->cs_wr5_dtr); 1304 1305 if (!cs->cs_heldchange) { 1306 if (zst->zst_tx_busy) { 1307 zst->zst_heldtbc = zst->zst_tbc; 1308 zst->zst_tbc = 0; 1309 cs->cs_heldchange = 1; 1310 } else 1311 zs_loadchannelregs(cs); 1312 } 1313 } 1314 1315 /* 1316 * Set modem bits. 1317 * Called at splzs() and with the channel lock held. 1318 */ 1319 static void 1320 tiocm_to_zs(zst, how, ttybits) 1321 struct zstty_softc *zst; 1322 u_long how; 1323 int ttybits; 1324 { 1325 struct zs_chanstate *cs = zst->zst_cs, *ccs; 1326 u_char zsbits; 1327 1328 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs); 1329 1330 zsbits = 0; 1331 if (ISSET(ttybits, TIOCM_DTR)) 1332 SET(zsbits, ZSWR5_DTR); 1333 if (ISSET(ttybits, TIOCM_RTS)) 1334 SET(zsbits, ZSWR5_RTS); 1335 1336 switch (how) { 1337 case TIOCMBIC: 1338 CLR(ccs->cs_preg[5], zsbits); 1339 break; 1340 1341 case TIOCMBIS: 1342 SET(ccs->cs_preg[5], zsbits); 1343 break; 1344 1345 case TIOCMSET: 1346 CLR(ccs->cs_preg[5], ZSWR5_RTS | ZSWR5_DTR); 1347 SET(ccs->cs_preg[5], zsbits); 1348 break; 1349 } 1350 1351 if (!cs->cs_heldchange) { 1352 if (zst->zst_tx_busy) { 1353 zst->zst_heldtbc = zst->zst_tbc; 1354 zst->zst_tbc = 0; 1355 cs->cs_heldchange = 1; 1356 } else 1357 zs_loadchannelregs(cs); 1358 } 1359 } 1360 1361 /* 1362 * Get modem bits. 1363 * Called at splzs() and with the channel lock held. 1364 */ 1365 static int 1366 zs_to_tiocm(zst) 1367 struct zstty_softc *zst; 1368 { 1369 struct zs_chanstate *cs = zst->zst_cs, *ccs; 1370 u_char zsbits; 1371 int ttybits = 0; 1372 1373 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs); 1374 1375 zsbits = ccs->cs_preg[5]; 1376 if (ISSET(zsbits, ZSWR5_DTR)) 1377 SET(ttybits, TIOCM_DTR); 1378 if (ISSET(zsbits, ZSWR5_RTS)) 1379 SET(ttybits, TIOCM_RTS); 1380 1381 zsbits = cs->cs_rr0; 1382 if (ISSET(zsbits, ZSRR0_DCD)) 1383 SET(ttybits, TIOCM_CD); 1384 if (ISSET(zsbits, ZSRR0_CTS)) 1385 SET(ttybits, TIOCM_CTS); 1386 1387 return (ttybits); 1388 } 1389 1390 /* 1391 * Try to block or unblock input using hardware flow-control. 1392 * This is called by kern/tty.c if MDMBUF|CRTSCTS is set, and 1393 * if this function returns non-zero, the TS_TBLOCK flag will 1394 * be set or cleared according to the "block" arg passed. 1395 */ 1396 int 1397 zshwiflow(tp, block) 1398 struct tty *tp; 1399 int block; 1400 { 1401 struct zstty_softc *zst = device_lookup(&zstty_cd, ZSUNIT(tp->t_dev)); 1402 struct zs_chanstate *cs = zst->zst_cs; 1403 int s; 1404 1405 if (cs->cs_wr5_rts == 0) 1406 return (0); 1407 1408 s = splzs(); 1409 simple_lock(&cs->cs_lock); 1410 if (block) { 1411 if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1412 SET(zst->zst_rx_flags, RX_TTY_BLOCKED); 1413 zs_hwiflow(zst); 1414 } 1415 } else { 1416 if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1417 CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1418 zst->zst_rx_ready = 1; 1419 cs->cs_softreq = 1; 1420 } 1421 if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1422 CLR(zst->zst_rx_flags, RX_TTY_BLOCKED); 1423 zs_hwiflow(zst); 1424 } 1425 } 1426 simple_unlock(&cs->cs_lock); 1427 splx(s); 1428 return (1); 1429 } 1430 1431 /* 1432 * Internal version of zshwiflow 1433 * Called at splzs() and with the channel lock held. 1434 */ 1435 static void 1436 zs_hwiflow(zst) 1437 struct zstty_softc *zst; 1438 { 1439 struct zs_chanstate *cs = zst->zst_cs, *ccs; 1440 1441 if (cs->cs_wr5_rts == 0) 1442 return; 1443 1444 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs); 1445 1446 if (ISSET(zst->zst_rx_flags, RX_ANY_BLOCK)) { 1447 CLR(ccs->cs_preg[5], cs->cs_wr5_rts); 1448 CLR(ccs->cs_creg[5], cs->cs_wr5_rts); 1449 } else { 1450 SET(ccs->cs_preg[5], cs->cs_wr5_rts); 1451 SET(ccs->cs_creg[5], cs->cs_wr5_rts); 1452 } 1453 zs_write_reg(ccs, 5, ccs->cs_creg[5]); 1454 } 1455 1456 1457 /**************************************************************** 1458 * Interface to the lower layer (zscc) 1459 ****************************************************************/ 1460 1461 #define integrate static inline 1462 integrate void zstty_rxsoft __P((struct zstty_softc *, struct tty *)); 1463 integrate void zstty_txsoft __P((struct zstty_softc *, struct tty *)); 1464 integrate void zstty_stsoft __P((struct zstty_softc *, struct tty *)); 1465 static void zstty_diag __P((void *)); 1466 1467 /* 1468 * Receiver Ready interrupt. 1469 * Called at splzs() and with the channel lock held. 1470 */ 1471 static void 1472 zstty_rxint(cs) 1473 struct zs_chanstate *cs; 1474 { 1475 struct zstty_softc *zst = cs->cs_private; 1476 u_char *put, *end; 1477 u_int cc; 1478 u_char rr0, rr1, c; 1479 1480 end = zst->zst_ebuf; 1481 put = zst->zst_rbput; 1482 cc = zst->zst_rbavail; 1483 1484 while (cc > 0) { 1485 /* 1486 * First read the status, because reading the received char 1487 * destroys the status of this char. 1488 */ 1489 rr1 = zs_read_reg(cs, 1); 1490 c = zs_read_data(cs); 1491 1492 if (ISSET(rr1, ZSRR1_FE | ZSRR1_DO | ZSRR1_PE)) { 1493 /* Clear the receive error. */ 1494 zs_write_csr(cs, ZSWR0_RESET_ERRORS); 1495 } 1496 1497 cn_check_magic(zst->zst_tty->t_dev, c, zstty_cnm_state); 1498 put[0] = c; 1499 put[1] = rr1; 1500 put += 2; 1501 if (put >= end) 1502 put = zst->zst_rbuf; 1503 cc--; 1504 1505 rr0 = zs_read_csr(cs); 1506 if (!ISSET(rr0, ZSRR0_RX_READY)) 1507 break; 1508 } 1509 1510 /* 1511 * Current string of incoming characters ended because 1512 * no more data was available or we ran out of space. 1513 * Schedule a receive event if any data was received. 1514 * If we're out of space, turn off receive interrupts. 1515 */ 1516 zst->zst_rbput = put; 1517 zst->zst_rbavail = cc; 1518 if (!ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1519 zst->zst_rx_ready = 1; 1520 cs->cs_softreq = 1; 1521 } 1522 1523 /* 1524 * See if we are in danger of overflowing a buffer. If 1525 * so, use hardware flow control to ease the pressure. 1526 */ 1527 if (!ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED) && 1528 cc < zst->zst_r_hiwat) { 1529 SET(zst->zst_rx_flags, RX_IBUF_BLOCKED); 1530 zs_hwiflow(zst); 1531 } 1532 1533 /* 1534 * If we're out of space, disable receive interrupts 1535 * until the queue has drained a bit. 1536 */ 1537 if (!cc) { 1538 SET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED); 1539 CLR(cs->cs_preg[1], ZSWR1_RIE); 1540 cs->cs_creg[1] = cs->cs_preg[1]; 1541 zs_write_reg(cs, 1, cs->cs_creg[1]); 1542 } 1543 1544 #if 0 1545 printf("%xH%04d\n", zst->zst_rx_flags, zst->zst_rbavail); 1546 #endif 1547 } 1548 1549 /* 1550 * Transmitter Ready interrupt. 1551 * Called at splzs() and with the channel lock held. 1552 */ 1553 static void 1554 zstty_txint(cs) 1555 struct zs_chanstate *cs; 1556 { 1557 struct zstty_softc *zst = cs->cs_private; 1558 1559 /* 1560 * If we've delayed a parameter change, do it now, and restart 1561 * output. 1562 */ 1563 if (cs->cs_heldchange) { 1564 zs_loadchannelregs(cs); 1565 cs->cs_heldchange = 0; 1566 zst->zst_tbc = zst->zst_heldtbc; 1567 zst->zst_heldtbc = 0; 1568 } 1569 1570 /* Output the next character in the buffer, if any. */ 1571 if (zst->zst_tbc > 0) { 1572 zs_write_data(cs, *zst->zst_tba); 1573 zst->zst_tbc--; 1574 zst->zst_tba++; 1575 } else { 1576 /* Disable transmit completion interrupts if necessary. */ 1577 if (ISSET(cs->cs_preg[1], ZSWR1_TIE)) { 1578 CLR(cs->cs_preg[1], ZSWR1_TIE); 1579 cs->cs_creg[1] = cs->cs_preg[1]; 1580 zs_write_reg(cs, 1, cs->cs_creg[1]); 1581 } 1582 if (zst->zst_tx_busy) { 1583 zst->zst_tx_busy = 0; 1584 zst->zst_tx_done = 1; 1585 cs->cs_softreq = 1; 1586 } 1587 } 1588 } 1589 1590 /* 1591 * Status Change interrupt. 1592 * Called at splzs() and with the channel lock held. 1593 */ 1594 static void 1595 zstty_stint(cs, force) 1596 struct zs_chanstate *cs; 1597 int force; 1598 { 1599 struct zstty_softc *zst = cs->cs_private; 1600 u_char rr0, delta; 1601 1602 rr0 = zs_read_csr(cs); 1603 zs_write_csr(cs, ZSWR0_RESET_STATUS); 1604 1605 /* 1606 * Check here for console break, so that we can abort 1607 * even when interrupts are locking up the machine. 1608 */ 1609 if (ISSET(rr0, ZSRR0_BREAK)) 1610 cn_check_magic(zst->zst_tty->t_dev, CNC_BREAK, zstty_cnm_state); 1611 1612 if (!force) 1613 delta = rr0 ^ cs->cs_rr0; 1614 else 1615 delta = cs->cs_rr0_mask; 1616 cs->cs_rr0 = rr0; 1617 1618 if (ISSET(delta, cs->cs_rr0_mask)) { 1619 SET(cs->cs_rr0_delta, delta); 1620 1621 /* 1622 * Pulse-per-second clock signal on edge of DCD? 1623 */ 1624 if (ISSET(delta, zst->zst_ppsmask)) { 1625 struct timeval tv; 1626 if (ISSET(rr0, zst->zst_ppsmask) == zst->zst_ppsassert) { 1627 /* XXX nanotime() */ 1628 microtime(&tv); 1629 TIMEVAL_TO_TIMESPEC(&tv, 1630 &zst->ppsinfo.assert_timestamp); 1631 if (zst->ppsparam.mode & PPS_OFFSETASSERT) { 1632 timespecadd(&zst->ppsinfo.assert_timestamp, 1633 &zst->ppsparam.assert_offset, 1634 &zst->ppsinfo.assert_timestamp); 1635 } 1636 1637 #ifdef PPS_SYNC 1638 if (zst->ppsparam.mode & PPS_HARDPPSONASSERT) 1639 hardpps(&tv, tv.tv_usec); 1640 #endif 1641 zst->ppsinfo.assert_sequence++; 1642 zst->ppsinfo.current_mode = zst->ppsparam.mode; 1643 } else if (ISSET(rr0, zst->zst_ppsmask) == 1644 zst->zst_ppsclear) { 1645 /* XXX nanotime() */ 1646 microtime(&tv); 1647 TIMEVAL_TO_TIMESPEC(&tv, 1648 &zst->ppsinfo.clear_timestamp); 1649 if (zst->ppsparam.mode & PPS_OFFSETCLEAR) { 1650 timespecadd(&zst->ppsinfo.clear_timestamp, 1651 &zst->ppsparam.clear_offset, 1652 &zst->ppsinfo.clear_timestamp); 1653 } 1654 1655 #ifdef PPS_SYNC 1656 if (zst->ppsparam.mode & PPS_HARDPPSONCLEAR) 1657 hardpps(&tv, tv.tv_usec); 1658 #endif 1659 zst->ppsinfo.clear_sequence++; 1660 zst->ppsinfo.current_mode = zst->ppsparam.mode; 1661 } 1662 } 1663 1664 /* 1665 * Stop output immediately if we lose the output 1666 * flow control signal or carrier detect. 1667 */ 1668 if (ISSET(~rr0, cs->cs_rr0_mask)) { 1669 zst->zst_tbc = 0; 1670 zst->zst_heldtbc = 0; 1671 } 1672 1673 zst->zst_st_check = 1; 1674 cs->cs_softreq = 1; 1675 } 1676 } 1677 1678 void 1679 zstty_diag(arg) 1680 void *arg; 1681 { 1682 struct zstty_softc *zst = arg; 1683 int overflows, floods; 1684 int s; 1685 1686 s = splzs(); 1687 overflows = zst->zst_overflows; 1688 zst->zst_overflows = 0; 1689 floods = zst->zst_floods; 1690 zst->zst_floods = 0; 1691 zst->zst_errors = 0; 1692 splx(s); 1693 1694 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1695 zst->zst_dev.dv_xname, 1696 overflows, overflows == 1 ? "" : "s", 1697 floods, floods == 1 ? "" : "s"); 1698 } 1699 1700 integrate void 1701 zstty_rxsoft(zst, tp) 1702 struct zstty_softc *zst; 1703 struct tty *tp; 1704 { 1705 struct zs_chanstate *cs = zst->zst_cs; 1706 int (*rint) __P((int c, struct tty *tp)) = tp->t_linesw->l_rint; 1707 u_char *get, *end; 1708 u_int cc, scc; 1709 u_char rr1; 1710 int code; 1711 int s; 1712 1713 end = zst->zst_ebuf; 1714 get = zst->zst_rbget; 1715 scc = cc = zstty_rbuf_size - zst->zst_rbavail; 1716 1717 if (cc == zstty_rbuf_size) { 1718 zst->zst_floods++; 1719 if (zst->zst_errors++ == 0) 1720 callout_reset(&zst->zst_diag_ch, 60 * hz, 1721 zstty_diag, zst); 1722 } 1723 1724 /* If not yet open, drop the entire buffer content here */ 1725 if (!ISSET(tp->t_state, TS_ISOPEN)) { 1726 get += cc << 1; 1727 if (get >= end) 1728 get -= zstty_rbuf_size << 1; 1729 cc = 0; 1730 } 1731 while (cc) { 1732 code = get[0]; 1733 rr1 = get[1]; 1734 if (ISSET(rr1, ZSRR1_DO | ZSRR1_FE | ZSRR1_PE)) { 1735 if (ISSET(rr1, ZSRR1_DO)) { 1736 zst->zst_overflows++; 1737 if (zst->zst_errors++ == 0) 1738 callout_reset(&zst->zst_diag_ch, 1739 60 * hz, zstty_diag, zst); 1740 } 1741 if (ISSET(rr1, ZSRR1_FE)) 1742 SET(code, TTY_FE); 1743 if (ISSET(rr1, ZSRR1_PE)) 1744 SET(code, TTY_PE); 1745 } 1746 if ((*rint)(code, tp) == -1) { 1747 /* 1748 * The line discipline's buffer is out of space. 1749 */ 1750 if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1751 /* 1752 * We're either not using flow control, or the 1753 * line discipline didn't tell us to block for 1754 * some reason. Either way, we have no way to 1755 * know when there's more space available, so 1756 * just drop the rest of the data. 1757 */ 1758 get += cc << 1; 1759 if (get >= end) 1760 get -= zstty_rbuf_size << 1; 1761 cc = 0; 1762 } else { 1763 /* 1764 * Don't schedule any more receive processing 1765 * until the line discipline tells us there's 1766 * space available (through comhwiflow()). 1767 * Leave the rest of the data in the input 1768 * buffer. 1769 */ 1770 SET(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1771 } 1772 break; 1773 } 1774 get += 2; 1775 if (get >= end) 1776 get = zst->zst_rbuf; 1777 cc--; 1778 } 1779 1780 if (cc != scc) { 1781 zst->zst_rbget = get; 1782 s = splzs(); 1783 simple_lock(&cs->cs_lock); 1784 cc = zst->zst_rbavail += scc - cc; 1785 /* Buffers should be ok again, release possible block. */ 1786 if (cc >= zst->zst_r_lowat) { 1787 if (ISSET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED)) { 1788 CLR(zst->zst_rx_flags, RX_IBUF_OVERFLOWED); 1789 SET(cs->cs_preg[1], ZSWR1_RIE); 1790 cs->cs_creg[1] = cs->cs_preg[1]; 1791 zs_write_reg(cs, 1, cs->cs_creg[1]); 1792 } 1793 if (ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED)) { 1794 CLR(zst->zst_rx_flags, RX_IBUF_BLOCKED); 1795 zs_hwiflow(zst); 1796 } 1797 } 1798 simple_unlock(&cs->cs_lock); 1799 splx(s); 1800 } 1801 1802 #if 0 1803 printf("%xS%04d\n", zst->zst_rx_flags, zst->zst_rbavail); 1804 #endif 1805 } 1806 1807 integrate void 1808 zstty_txsoft(zst, tp) 1809 struct zstty_softc *zst; 1810 struct tty *tp; 1811 { 1812 struct zs_chanstate *cs = zst->zst_cs; 1813 int s; 1814 1815 s = splzs(); 1816 simple_lock(&cs->cs_lock); 1817 CLR(tp->t_state, TS_BUSY); 1818 if (ISSET(tp->t_state, TS_FLUSH)) 1819 CLR(tp->t_state, TS_FLUSH); 1820 else 1821 ndflush(&tp->t_outq, (int)(zst->zst_tba - tp->t_outq.c_cf)); 1822 simple_unlock(&cs->cs_lock); 1823 splx(s); 1824 (*tp->t_linesw->l_start)(tp); 1825 } 1826 1827 integrate void 1828 zstty_stsoft(zst, tp) 1829 struct zstty_softc *zst; 1830 struct tty *tp; 1831 { 1832 struct zs_chanstate *cs = zst->zst_cs; 1833 u_char rr0, delta; 1834 int s; 1835 1836 s = splzs(); 1837 simple_lock(&cs->cs_lock); 1838 rr0 = cs->cs_rr0; 1839 delta = cs->cs_rr0_delta; 1840 cs->cs_rr0_delta = 0; 1841 simple_unlock(&cs->cs_lock); 1842 splx(s); 1843 1844 if (ISSET(delta, cs->cs_rr0_dcd)) { 1845 /* 1846 * Inform the tty layer that carrier detect changed. 1847 */ 1848 (void) (*tp->t_linesw->l_modem)(tp, ISSET(rr0, ZSRR0_DCD)); 1849 } 1850 1851 if (ISSET(delta, cs->cs_rr0_cts)) { 1852 /* Block or unblock output according to flow control. */ 1853 if (ISSET(rr0, cs->cs_rr0_cts)) { 1854 zst->zst_tx_stopped = 0; 1855 (*tp->t_linesw->l_start)(tp); 1856 } else { 1857 zst->zst_tx_stopped = 1; 1858 } 1859 } 1860 } 1861 1862 /* 1863 * Software interrupt. Called at zssoft 1864 * 1865 * The main job to be done here is to empty the input ring 1866 * by passing its contents up to the tty layer. The ring is 1867 * always emptied during this operation, therefore the ring 1868 * must not be larger than the space after "high water" in 1869 * the tty layer, or the tty layer might drop our input. 1870 * 1871 * Note: an "input blockage" condition is assumed to exist if 1872 * EITHER the TS_TBLOCK flag or zst_rx_blocked flag is set. 1873 */ 1874 static void 1875 zstty_softint(cs) 1876 struct zs_chanstate *cs; 1877 { 1878 struct zstty_softc *zst = cs->cs_private; 1879 struct tty *tp = zst->zst_tty; 1880 int s; 1881 1882 s = spltty(); 1883 1884 if (zst->zst_rx_ready) { 1885 zst->zst_rx_ready = 0; 1886 zstty_rxsoft(zst, tp); 1887 } 1888 1889 if (zst->zst_st_check) { 1890 zst->zst_st_check = 0; 1891 zstty_stsoft(zst, tp); 1892 } 1893 1894 if (zst->zst_tx_done) { 1895 zst->zst_tx_done = 0; 1896 zstty_txsoft(zst, tp); 1897 } 1898 1899 splx(s); 1900 } 1901 1902 struct zsops zsops_tty = { 1903 zstty_rxint, /* receive char available */ 1904 zstty_stint, /* external/status */ 1905 zstty_txint, /* xmit buffer empty */ 1906 zstty_softint, /* process software interrupt */ 1907 }; 1908
Indexes created Sat Sep 27 14:09:57 GMT 2025