z8530tty.c revision 1.63
1 /* $NetBSD: z8530tty.c,v 1.63 2000/03/14 21:20:52 jdc Exp $ */ 2 3 /*- 4 * Copyright (c) 1993, 1994, 1995, 1996, 1997, 1998, 1999 5 * Charles M. Hannum. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by Charles M. Hannum. 18 * 4. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1994 Gordon W. Ross 35 * Copyright (c) 1992, 1993 36 * The Regents of the University of California. All rights reserved. 37 * 38 * This software was developed by the Computer Systems Engineering group 39 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 40 * contributed to Berkeley. 41 * 42 * All advertising materials mentioning features or use of this software 43 * must display the following acknowledgement: 44 * This product includes software developed by the University of 45 * California, Lawrence Berkeley Laboratory. 46 * 47 * Redistribution and use in source and binary forms, with or without 48 * modification, are permitted provided that the following conditions 49 * are met: 50 * 1. Redistributions of source code must retain the above copyright 51 * notice, this list of conditions and the following disclaimer. 52 * 2. Redistributions in binary form must reproduce the above copyright 53 * notice, this list of conditions and the following disclaimer in the 54 * documentation and/or other materials provided with the distribution. 55 * 3. All advertising materials mentioning features or use of this software 56 * must display the following acknowledgement: 57 * This product includes software developed by the University of 58 * California, Berkeley and its contributors. 59 * 4. Neither the name of the University nor the names of its contributors 60 * may be used to endorse or promote products derived from this software 61 * without specific prior written permission. 62 * 63 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 64 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 65 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 66 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 67 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 68 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 69 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 70 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 71 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 72 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 73 * SUCH DAMAGE. 74 * 75 * @(#)zs.c 8.1 (Berkeley) 7/19/93 76 */ 77 78 /* 79 * Zilog Z8530 Dual UART driver (tty interface) 80 * 81 * This is the "slave" driver that will be attached to 82 * the "zsc" driver for plain "tty" async. serial lines. 83 * 84 * Credits, history: 85 * 86 * The original version of this code was the sparc/dev/zs.c driver 87 * as distributed with the Berkeley 4.4 Lite release. Since then, 88 * Gordon Ross reorganized the code into the current parent/child 89 * driver scheme, separating the Sun keyboard and mouse support 90 * into independent child drivers. 91 * 92 * RTS/CTS flow-control support was a collaboration of: 93 * Gordon Ross <gwr (at) netbsd.org>, 94 * Bill Studenmund <wrstuden (at) loki.stanford.edu> 95 * Ian Dall <Ian.Dall (at) dsto.defence.gov.au> 96 * 97 * The driver was massively overhauled in November 1997 by Charles Hannum, 98 * fixing *many* bugs, and substantially improving performance. 99 */ 100 101 #include <sys/param.h> 102 #include <sys/systm.h> 103 #include <sys/proc.h> 104 #include <sys/device.h> 105 #include <sys/conf.h> 106 #include <sys/file.h> 107 #include <sys/ioctl.h> 108 #include <sys/malloc.h> 109 #include <sys/timepps.h> 110 #include <sys/tty.h> 111 #include <sys/time.h> 112 #include <sys/kernel.h> 113 #include <sys/syslog.h> 114 115 #include <dev/ic/z8530reg.h> 116 #include <machine/z8530var.h> 117 118 #include <dev/cons.h> 119 120 #include "locators.h" 121 122 /* 123 * How many input characters we can buffer. 124 * The port-specific var.h may override this. 125 * Note: must be a power of two! 126 */ 127 #ifndef ZSTTY_RING_SIZE 128 #define ZSTTY_RING_SIZE 2048 129 #endif 130 131 /* 132 * Make this an option variable one can patch. 133 * But be warned: this must be a power of 2! 134 */ 135 u_int zstty_rbuf_size = ZSTTY_RING_SIZE; 136 137 /* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */ 138 u_int zstty_rbuf_hiwat = (ZSTTY_RING_SIZE * 1) / 4; 139 u_int zstty_rbuf_lowat = (ZSTTY_RING_SIZE * 3) / 4; 140 141 static int zsppscap = 142 PPS_TSFMT_TSPEC | 143 PPS_CAPTUREASSERT | 144 PPS_CAPTURECLEAR | 145 #ifdef PPS_SYNC 146 PPS_HARDPPSONASSERT | PPS_HARDPPSONCLEAR | 147 #endif /* PPS_SYNC */ 148 PPS_OFFSETASSERT | PPS_OFFSETCLEAR; 149 150 struct zstty_softc { 151 struct device zst_dev; /* required first: base device */ 152 struct tty *zst_tty; 153 struct zs_chanstate *zst_cs; 154 155 u_int zst_overflows, 156 zst_floods, 157 zst_errors; 158 159 int zst_hwflags, /* see z8530var.h */ 160 zst_swflags; /* TIOCFLAG_SOFTCAR, ... <ttycom.h> */ 161 162 u_int zst_r_hiwat, 163 zst_r_lowat; 164 u_char *volatile zst_rbget, 165 *volatile zst_rbput; 166 volatile u_int zst_rbavail; 167 u_char *zst_rbuf, 168 *zst_ebuf; 169 170 /* 171 * The transmit byte count and address are used for pseudo-DMA 172 * output in the hardware interrupt code. PDMA can be suspended 173 * to get pending changes done; heldtbc is used for this. It can 174 * also be stopped for ^S; this sets TS_TTSTOP in tp->t_state. 175 */ 176 u_char *zst_tba; /* transmit buffer address */ 177 u_int zst_tbc, /* transmit byte count */ 178 zst_heldtbc; /* held tbc while xmission stopped */ 179 180 /* Flags to communicate with zstty_softint() */ 181 volatile u_char zst_rx_flags, /* receiver blocked */ 182 #define RX_TTY_BLOCKED 0x01 183 #define RX_TTY_OVERFLOWED 0x02 184 #define RX_IBUF_BLOCKED 0x04 185 #define RX_IBUF_OVERFLOWED 0x08 186 #define RX_ANY_BLOCK 0x0f 187 zst_tx_busy, /* working on an output chunk */ 188 zst_tx_done, /* done with one output chunk */ 189 zst_tx_stopped, /* H/W level stop (lost CTS) */ 190 zst_st_check, /* got a status interrupt */ 191 zst_rx_ready; 192 193 /* PPS signal on DCD, with or without inkernel clock disciplining */ 194 u_char zst_ppsmask; /* pps signal mask */ 195 u_char zst_ppsassert; /* pps leading edge */ 196 u_char zst_ppsclear; /* pps trailing edge */ 197 pps_info_t ppsinfo; 198 pps_params_t ppsparam; 199 }; 200 201 /* Macros to clear/set/test flags. */ 202 #define SET(t, f) (t) |= (f) 203 #define CLR(t, f) (t) &= ~(f) 204 #define ISSET(t, f) ((t) & (f)) 205 206 /* Definition of the driver for autoconfig. */ 207 static int zstty_match(struct device *, struct cfdata *, void *); 208 static void zstty_attach(struct device *, struct device *, void *); 209 210 struct cfattach zstty_ca = { 211 sizeof(struct zstty_softc), zstty_match, zstty_attach 212 }; 213 214 extern struct cfdriver zstty_cd; 215 216 struct zsops zsops_tty; 217 218 /* Routines called from other code. */ 219 cdev_decl(zs); /* open, close, read, write, ioctl, stop, ... */ 220 221 static void zs_shutdown __P((struct zstty_softc *)); 222 static void zsstart __P((struct tty *)); 223 static int zsparam __P((struct tty *, struct termios *)); 224 static void zs_modem __P((struct zstty_softc *, int)); 225 static void tiocm_to_zs __P((struct zstty_softc *, int, int)); 226 static int zs_to_tiocm __P((struct zstty_softc *)); 227 static int zshwiflow __P((struct tty *, int)); 228 static void zs_hwiflow __P((struct zstty_softc *)); 229 static void zs_maskintr __P((struct zstty_softc *)); 230 231 /* Low-level routines. */ 232 static void zstty_rxint __P((struct zs_chanstate *)); 233 static void zstty_stint __P((struct zs_chanstate *, int)); 234 static void zstty_txint __P((struct zs_chanstate *)); 235 static void zstty_softint __P((struct zs_chanstate *)); 236 237 #define ZSUNIT(x) (minor(x) & 0x7ffff) 238 #define ZSDIALOUT(x) (minor(x) & 0x80000) 239 240 /* 241 * zstty_match: how is this zs channel configured? 242 */ 243 int 244 zstty_match(parent, cf, aux) 245 struct device *parent; 246 struct cfdata *cf; 247 void *aux; 248 { 249 struct zsc_attach_args *args = aux; 250 251 /* Exact match is better than wildcard. */ 252 if (cf->cf_loc[ZSCCF_CHANNEL] == args->channel) 253 return 2; 254 255 /* This driver accepts wildcard. */ 256 if (cf->cf_loc[ZSCCF_CHANNEL] == ZSCCF_CHANNEL_DEFAULT) 257 return 1; 258 259 return 0; 260 } 261 262 void 263 zstty_attach(parent, self, aux) 264 struct device *parent, *self; 265 void *aux; 266 267 { 268 struct zsc_softc *zsc = (void *) parent; 269 struct zstty_softc *zst = (void *) self; 270 struct cfdata *cf = self->dv_cfdata; 271 struct zsc_attach_args *args = aux; 272 struct zs_chanstate *cs; 273 struct tty *tp; 274 int channel, s, tty_unit; 275 dev_t dev; 276 277 tty_unit = zst->zst_dev.dv_unit; 278 channel = args->channel; 279 cs = zsc->zsc_cs[channel]; 280 cs->cs_private = zst; 281 cs->cs_ops = &zsops_tty; 282 283 zst->zst_cs = cs; 284 zst->zst_swflags = cf->cf_flags; /* softcar, etc. */ 285 zst->zst_hwflags = args->hwflags; 286 dev = makedev(zs_major, tty_unit); 287 288 if (zst->zst_swflags) 289 printf(" flags 0x%x", zst->zst_swflags); 290 291 if (ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 292 printf(" (console)\n"); 293 DELAY(20000); 294 cn_tab->cn_dev = dev; 295 } else 296 #ifdef KGDB 297 if (zs_check_kgdb(cs, dev)) { 298 /* 299 * Allow kgdb to "take over" this port. Returns true 300 * if this serial port is in-use by kgdb. 301 */ 302 printf(" (kgdb)\n"); 303 /* 304 * This is the kgdb port (exclusive use) 305 * so skip the normal attach code. 306 */ 307 return; 308 } else 309 #endif 310 printf("\n"); 311 312 tp = ttymalloc(); 313 tp->t_dev = dev; 314 tp->t_oproc = zsstart; 315 tp->t_param = zsparam; 316 tp->t_hwiflow = zshwiflow; 317 tty_attach(tp); 318 319 zst->zst_tty = tp; 320 zst->zst_rbuf = malloc(zstty_rbuf_size << 1, M_DEVBUF, M_WAITOK); 321 zst->zst_ebuf = zst->zst_rbuf + (zstty_rbuf_size << 1); 322 /* Disable the high water mark. */ 323 zst->zst_r_hiwat = 0; 324 zst->zst_r_lowat = 0; 325 zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf; 326 zst->zst_rbavail = zstty_rbuf_size; 327 328 /* if there are no enable/disable functions, assume the device 329 is always enabled */ 330 if (!cs->enable) 331 cs->enabled = 1; 332 333 /* 334 * Hardware init 335 */ 336 if (ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 337 /* Call zsparam similar to open. */ 338 struct termios t; 339 340 /* Setup the "new" parameters in t. */ 341 t.c_ispeed = 0; 342 t.c_ospeed = cs->cs_defspeed; 343 t.c_cflag = cs->cs_defcflag; 344 345 s = splzs(); 346 347 /* 348 * Turn on receiver and status interrupts. 349 * We defer the actual write of the register to zsparam(), 350 * but we must make sure status interrupts are turned on by 351 * the time zsparam() reads the initial rr0 state. 352 */ 353 SET(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE); 354 355 splx(s); 356 357 /* Make sure zsparam will see changes. */ 358 tp->t_ospeed = 0; 359 (void) zsparam(tp, &t); 360 361 s = splzs(); 362 363 /* Make sure DTR is on now. */ 364 zs_modem(zst, 1); 365 366 splx(s); 367 } else { 368 /* Not the console; may need reset. */ 369 int reset; 370 371 reset = (channel == 0) ? ZSWR9_A_RESET : ZSWR9_B_RESET; 372 373 s = splzs(); 374 375 zs_write_reg(cs, 9, reset); 376 377 /* Will raise DTR in open. */ 378 zs_modem(zst, 0); 379 380 splx(s); 381 } 382 } 383 384 385 /* 386 * Return pointer to our tty. 387 */ 388 struct tty * 389 zstty(dev) 390 dev_t dev; 391 { 392 struct zstty_softc *zst; 393 int unit = ZSUNIT(dev); 394 395 #ifdef DIAGNOSTIC 396 if (unit >= zstty_cd.cd_ndevs) 397 panic("zstty"); 398 #endif 399 zst = zstty_cd.cd_devs[unit]; 400 return (zst->zst_tty); 401 } 402 403 404 void 405 zs_shutdown(zst) 406 struct zstty_softc *zst; 407 { 408 struct zs_chanstate *cs = zst->zst_cs; 409 struct tty *tp = zst->zst_tty; 410 int s; 411 412 s = splzs(); 413 414 /* If we were asserting flow control, then deassert it. */ 415 SET(zst->zst_rx_flags, RX_IBUF_BLOCKED); 416 zs_hwiflow(zst); 417 418 /* Clear any break condition set with TIOCSBRK. */ 419 zs_break(cs, 0); 420 421 /* Turn off PPS capture on last close. */ 422 zst->zst_ppsmask = 0; 423 zst->ppsparam.mode = 0; 424 425 /* 426 * Hang up if necessary. Wait a bit, so the other side has time to 427 * notice even if we immediately open the port again. 428 */ 429 if (ISSET(tp->t_cflag, HUPCL)) { 430 zs_modem(zst, 0); 431 (void) tsleep(cs, TTIPRI, ttclos, hz); 432 } 433 434 /* Turn off interrupts if not the console. */ 435 if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 436 CLR(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE); 437 cs->cs_creg[1] = cs->cs_preg[1]; 438 zs_write_reg(cs, 1, cs->cs_creg[1]); 439 } 440 441 /* Call the power management hook. */ 442 if (cs->disable) { 443 #ifdef DIAGNOSTIC 444 if (!cs->enabled) 445 panic("zs_shutdown: not enabled?"); 446 #endif 447 (*cs->disable)(zst->zst_cs); 448 } 449 450 splx(s); 451 } 452 453 /* 454 * Open a zs serial (tty) port. 455 */ 456 int 457 zsopen(dev, flags, mode, p) 458 dev_t dev; 459 int flags; 460 int mode; 461 struct proc *p; 462 { 463 int unit = ZSUNIT(dev); 464 struct zstty_softc *zst; 465 struct zs_chanstate *cs; 466 struct tty *tp; 467 int s, s2; 468 int error; 469 470 if (unit >= zstty_cd.cd_ndevs) 471 return (ENXIO); 472 zst = zstty_cd.cd_devs[unit]; 473 if (zst == 0) 474 return (ENXIO); 475 tp = zst->zst_tty; 476 cs = zst->zst_cs; 477 478 /* If KGDB took the line, then tp==NULL */ 479 if (tp == NULL) 480 return (EBUSY); 481 482 if (ISSET(tp->t_state, TS_ISOPEN) && 483 ISSET(tp->t_state, TS_XCLUDE) && 484 p->p_ucred->cr_uid != 0) 485 return (EBUSY); 486 487 s = spltty(); 488 489 /* 490 * Do the following iff this is a first open. 491 */ 492 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 493 struct termios t; 494 495 tp->t_dev = dev; 496 497 /* Call the power management hook. */ 498 if (cs->enable) { 499 if ((*cs->enable)(cs)) { 500 splx(s2); 501 splx(s); 502 printf("%s: device enable failed\n", 503 zst->zst_dev.dv_xname); 504 return (EIO); 505 } 506 } 507 508 /* 509 * Initialize the termios status to the defaults. Add in the 510 * sticky bits from TIOCSFLAGS. 511 */ 512 t.c_ispeed = 0; 513 t.c_ospeed = cs->cs_defspeed; 514 t.c_cflag = cs->cs_defcflag; 515 if (ISSET(zst->zst_swflags, TIOCFLAG_CLOCAL)) 516 SET(t.c_cflag, CLOCAL); 517 if (ISSET(zst->zst_swflags, TIOCFLAG_CRTSCTS)) 518 SET(t.c_cflag, CRTSCTS); 519 if (ISSET(zst->zst_swflags, TIOCFLAG_CDTRCTS)) 520 SET(t.c_cflag, CDTRCTS); 521 if (ISSET(zst->zst_swflags, TIOCFLAG_MDMBUF)) 522 SET(t.c_cflag, MDMBUF); 523 524 s2 = splzs(); 525 526 /* 527 * Turn on receiver and status interrupts. 528 * We defer the actual write of the register to zsparam(), 529 * but we must make sure status interrupts are turned on by 530 * the time zsparam() reads the initial rr0 state. 531 */ 532 SET(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE); 533 534 /* Clear PPS capture state on first open. */ 535 zst->zst_ppsmask = 0; 536 zst->ppsparam.mode = 0; 537 538 splx(s2); 539 540 /* Make sure zsparam will see changes. */ 541 tp->t_ospeed = 0; 542 (void) zsparam(tp, &t); 543 544 /* 545 * Note: zsparam has done: cflag, ispeed, ospeed 546 * so we just need to do: iflag, oflag, lflag, cc 547 * For "raw" mode, just leave all zeros. 548 */ 549 if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_RAW)) { 550 tp->t_iflag = TTYDEF_IFLAG; 551 tp->t_oflag = TTYDEF_OFLAG; 552 tp->t_lflag = TTYDEF_LFLAG; 553 } else { 554 tp->t_iflag = 0; 555 tp->t_oflag = 0; 556 tp->t_lflag = 0; 557 } 558 ttychars(tp); 559 ttsetwater(tp); 560 561 s2 = splzs(); 562 563 /* 564 * Turn on DTR. We must always do this, even if carrier is not 565 * present, because otherwise we'd have to use TIOCSDTR 566 * immediately after setting CLOCAL, which applications do not 567 * expect. We always assert DTR while the device is open 568 * unless explicitly requested to deassert it. 569 */ 570 zs_modem(zst, 1); 571 572 /* Clear the input ring, and unblock. */ 573 zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf; 574 zst->zst_rbavail = zstty_rbuf_size; 575 zs_iflush(cs); 576 CLR(zst->zst_rx_flags, RX_ANY_BLOCK); 577 zs_hwiflow(zst); 578 579 splx(s2); 580 } 581 582 splx(s); 583 584 error = ttyopen(tp, ZSDIALOUT(dev), ISSET(flags, O_NONBLOCK)); 585 if (error) 586 goto bad; 587 588 error = (*linesw[tp->t_line].l_open)(dev, tp); 589 if (error) 590 goto bad; 591 592 return (0); 593 594 bad: 595 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 596 /* 597 * We failed to open the device, and nobody else had it opened. 598 * Clean up the state as appropriate. 599 */ 600 zs_shutdown(zst); 601 } 602 603 return (error); 604 } 605 606 /* 607 * Close a zs serial port. 608 */ 609 int 610 zsclose(dev, flags, mode, p) 611 dev_t dev; 612 int flags; 613 int mode; 614 struct proc *p; 615 { 616 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(dev)]; 617 struct tty *tp = zst->zst_tty; 618 619 /* XXX This is for cons.c. */ 620 if (!ISSET(tp->t_state, TS_ISOPEN)) 621 return 0; 622 623 (*linesw[tp->t_line].l_close)(tp, flags); 624 ttyclose(tp); 625 626 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 627 /* 628 * Although we got a last close, the device may still be in 629 * use; e.g. if this was the dialout node, and there are still 630 * processes waiting for carrier on the non-dialout node. 631 */ 632 zs_shutdown(zst); 633 } 634 635 return (0); 636 } 637 638 /* 639 * Read/write zs serial port. 640 */ 641 int 642 zsread(dev, uio, flags) 643 dev_t dev; 644 struct uio *uio; 645 int flags; 646 { 647 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(dev)]; 648 struct tty *tp = zst->zst_tty; 649 650 return ((*linesw[tp->t_line].l_read)(tp, uio, flags)); 651 } 652 653 int 654 zswrite(dev, uio, flags) 655 dev_t dev; 656 struct uio *uio; 657 int flags; 658 { 659 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(dev)]; 660 struct tty *tp = zst->zst_tty; 661 662 return ((*linesw[tp->t_line].l_write)(tp, uio, flags)); 663 } 664 665 int 666 zsioctl(dev, cmd, data, flag, p) 667 dev_t dev; 668 u_long cmd; 669 caddr_t data; 670 int flag; 671 struct proc *p; 672 { 673 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(dev)]; 674 struct zs_chanstate *cs = zst->zst_cs; 675 struct tty *tp = zst->zst_tty; 676 int error; 677 int s; 678 679 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); 680 if (error >= 0) 681 return (error); 682 683 error = ttioctl(tp, cmd, data, flag, p); 684 if (error >= 0) 685 return (error); 686 687 #ifdef ZS_MD_IOCTL 688 error = ZS_MD_IOCTL; 689 if (error >= 0) 690 return (error); 691 #endif /* ZS_MD_IOCTL */ 692 693 error = 0; 694 695 s = splzs(); 696 697 switch (cmd) { 698 case TIOCSBRK: 699 zs_break(cs, 1); 700 break; 701 702 case TIOCCBRK: 703 zs_break(cs, 0); 704 break; 705 706 case TIOCGFLAGS: 707 *(int *)data = zst->zst_swflags; 708 break; 709 710 case TIOCSFLAGS: 711 error = suser(p->p_ucred, &p->p_acflag); 712 if (error) 713 break; 714 zst->zst_swflags = *(int *)data; 715 break; 716 717 case TIOCSDTR: 718 zs_modem(zst, 1); 719 break; 720 721 case TIOCCDTR: 722 zs_modem(zst, 0); 723 break; 724 725 case TIOCMSET: 726 case TIOCMBIS: 727 case TIOCMBIC: 728 tiocm_to_zs(zst, cmd, *(int *)data); 729 break; 730 731 case TIOCMGET: 732 *(int *)data = zs_to_tiocm(zst); 733 break; 734 735 case PPS_IOC_CREATE: 736 break; 737 738 case PPS_IOC_DESTROY: 739 break; 740 741 case PPS_IOC_GETPARAMS: { 742 pps_params_t *pp; 743 pp = (pps_params_t *)data; 744 *pp = zst->ppsparam; 745 break; 746 } 747 748 case PPS_IOC_SETPARAMS: { 749 pps_params_t *pp; 750 int mode; 751 if (cs->cs_rr0_pps == 0) { 752 error = EINVAL; 753 break; 754 } 755 pp = (pps_params_t *)data; 756 if (pp->mode & ~zsppscap) { 757 error = EINVAL; 758 break; 759 } 760 zst->ppsparam = *pp; 761 /* 762 * compute masks from user-specified timestamp state. 763 */ 764 mode = zst->ppsparam.mode; 765 #ifdef PPS_SYNC 766 if (mode & PPS_HARDPPSONASSERT) { 767 mode |= PPS_CAPTUREASSERT; 768 /* XXX revoke any previous HARDPPS source */ 769 } 770 if (mode & PPS_HARDPPSONCLEAR) { 771 mode |= PPS_CAPTURECLEAR; 772 /* XXX revoke any previous HARDPPS source */ 773 } 774 #endif /* PPS_SYNC */ 775 switch (mode & PPS_CAPTUREBOTH) { 776 case 0: 777 zst->zst_ppsmask = 0; 778 break; 779 780 case PPS_CAPTUREASSERT: 781 zst->zst_ppsmask = ZSRR0_DCD; 782 zst->zst_ppsassert = ZSRR0_DCD; 783 zst->zst_ppsclear = -1; 784 break; 785 786 case PPS_CAPTURECLEAR: 787 zst->zst_ppsmask = ZSRR0_DCD; 788 zst->zst_ppsassert = -1; 789 zst->zst_ppsclear = 0; 790 break; 791 792 case PPS_CAPTUREBOTH: 793 zst->zst_ppsmask = ZSRR0_DCD; 794 zst->zst_ppsassert = ZSRR0_DCD; 795 zst->zst_ppsclear = 0; 796 break; 797 798 default: 799 error = EINVAL; 800 break; 801 } 802 803 /* 804 * Now update interrupts. 805 */ 806 zs_maskintr(zst); 807 /* 808 * If nothing is being transmitted, set up new current values, 809 * else mark them as pending. 810 */ 811 if (!cs->cs_heldchange) { 812 if (zst->zst_tx_busy) { 813 zst->zst_heldtbc = zst->zst_tbc; 814 zst->zst_tbc = 0; 815 cs->cs_heldchange = 1; 816 } else 817 zs_loadchannelregs(cs); 818 } 819 820 break; 821 } 822 823 case PPS_IOC_GETCAP: 824 *(int *)data = zsppscap; 825 break; 826 827 case PPS_IOC_FETCH: { 828 pps_info_t *pi; 829 pi = (pps_info_t *)data; 830 *pi = zst->ppsinfo; 831 break; 832 } 833 834 case TIOCDCDTIMESTAMP: /* XXX old, overloaded API used by xntpd v3 */ 835 if (cs->cs_rr0_pps == 0) { 836 error = EINVAL; 837 break; 838 } 839 /* 840 * Some GPS clocks models use the falling rather than 841 * rising edge as the on-the-second signal. 842 * The old API has no way to specify PPS polarity. 843 */ 844 zst->zst_ppsmask = ZSRR0_DCD; 845 #ifndef PPS_TRAILING_EDGE 846 zst->zst_ppsassert = ZSRR0_DCD; 847 zst->zst_ppsclear = -1; 848 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 849 &zst->ppsinfo.assert_timestamp); 850 #else 851 zst->zst_ppsassert = -1; 852 zst->zst_ppsclear = 01; 853 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 854 &zst->ppsinfo.clear_timestamp); 855 #endif 856 /* 857 * Now update interrupts. 858 */ 859 zs_maskintr(zst); 860 /* 861 * If nothing is being transmitted, set up new current values, 862 * else mark them as pending. 863 */ 864 if (!cs->cs_heldchange) { 865 if (zst->zst_tx_busy) { 866 zst->zst_heldtbc = zst->zst_tbc; 867 zst->zst_tbc = 0; 868 cs->cs_heldchange = 1; 869 } else 870 zs_loadchannelregs(cs); 871 } 872 873 break; 874 875 default: 876 error = ENOTTY; 877 break; 878 } 879 880 splx(s); 881 882 return (error); 883 } 884 885 /* 886 * Start or restart transmission. 887 */ 888 static void 889 zsstart(tp) 890 struct tty *tp; 891 { 892 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(tp->t_dev)]; 893 struct zs_chanstate *cs = zst->zst_cs; 894 int s; 895 896 s = spltty(); 897 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 898 goto out; 899 if (zst->zst_tx_stopped) 900 goto out; 901 902 if (tp->t_outq.c_cc <= tp->t_lowat) { 903 if (ISSET(tp->t_state, TS_ASLEEP)) { 904 CLR(tp->t_state, TS_ASLEEP); 905 wakeup((caddr_t)&tp->t_outq); 906 } 907 selwakeup(&tp->t_wsel); 908 if (tp->t_outq.c_cc == 0) 909 goto out; 910 } 911 912 /* Grab the first contiguous region of buffer space. */ 913 { 914 u_char *tba; 915 int tbc; 916 917 tba = tp->t_outq.c_cf; 918 tbc = ndqb(&tp->t_outq, 0); 919 920 (void) splzs(); 921 922 zst->zst_tba = tba; 923 zst->zst_tbc = tbc; 924 } 925 926 SET(tp->t_state, TS_BUSY); 927 zst->zst_tx_busy = 1; 928 929 /* Enable transmit completion interrupts if necessary. */ 930 if (!ISSET(cs->cs_preg[1], ZSWR1_TIE)) { 931 SET(cs->cs_preg[1], ZSWR1_TIE); 932 cs->cs_creg[1] = cs->cs_preg[1]; 933 zs_write_reg(cs, 1, cs->cs_creg[1]); 934 } 935 936 /* Output the first character of the contiguous buffer. */ 937 { 938 zs_write_data(cs, *zst->zst_tba); 939 zst->zst_tbc--; 940 zst->zst_tba++; 941 } 942 out: 943 splx(s); 944 return; 945 } 946 947 /* 948 * Stop output, e.g., for ^S or output flush. 949 */ 950 void 951 zsstop(tp, flag) 952 struct tty *tp; 953 int flag; 954 { 955 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(tp->t_dev)]; 956 int s; 957 958 s = splzs(); 959 if (ISSET(tp->t_state, TS_BUSY)) { 960 /* Stop transmitting at the next chunk. */ 961 zst->zst_tbc = 0; 962 zst->zst_heldtbc = 0; 963 if (!ISSET(tp->t_state, TS_TTSTOP)) 964 SET(tp->t_state, TS_FLUSH); 965 } 966 splx(s); 967 } 968 969 /* 970 * Set ZS tty parameters from termios. 971 * XXX - Should just copy the whole termios after 972 * making sure all the changes could be done. 973 */ 974 static int 975 zsparam(tp, t) 976 struct tty *tp; 977 struct termios *t; 978 { 979 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(tp->t_dev)]; 980 struct zs_chanstate *cs = zst->zst_cs; 981 int ospeed, cflag; 982 u_char tmp3, tmp4, tmp5; 983 int s, error; 984 985 ospeed = t->c_ospeed; 986 cflag = t->c_cflag; 987 988 /* Check requested parameters. */ 989 if (ospeed < 0) 990 return (EINVAL); 991 if (t->c_ispeed && t->c_ispeed != ospeed) 992 return (EINVAL); 993 994 /* 995 * For the console, always force CLOCAL and !HUPCL, so that the port 996 * is always active. 997 */ 998 if (ISSET(zst->zst_swflags, TIOCFLAG_SOFTCAR) || 999 ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 1000 SET(cflag, CLOCAL); 1001 CLR(cflag, HUPCL); 1002 } 1003 1004 /* 1005 * Only whack the UART when params change. 1006 * Some callers need to clear tp->t_ospeed 1007 * to make sure initialization gets done. 1008 */ 1009 if (tp->t_ospeed == ospeed && 1010 tp->t_cflag == cflag) 1011 return (0); 1012 1013 /* 1014 * Call MD functions to deal with changed 1015 * clock modes or H/W flow control modes. 1016 * The BRG divisor is set now. (reg 12,13) 1017 */ 1018 error = zs_set_speed(cs, ospeed); 1019 if (error) 1020 return (error); 1021 error = zs_set_modes(cs, cflag); 1022 if (error) 1023 return (error); 1024 1025 /* 1026 * Block interrupts so that state will not 1027 * be altered until we are done setting it up. 1028 * 1029 * Initial values in cs_preg are set before 1030 * our attach routine is called. The master 1031 * interrupt enable is handled by zsc.c 1032 * 1033 */ 1034 s = splzs(); 1035 1036 /* 1037 * Recalculate which status ints to enable. 1038 */ 1039 zs_maskintr(zst); 1040 1041 /* Recompute character size bits. */ 1042 tmp3 = cs->cs_preg[3]; 1043 tmp5 = cs->cs_preg[5]; 1044 CLR(tmp3, ZSWR3_RXSIZE); 1045 CLR(tmp5, ZSWR5_TXSIZE); 1046 switch (ISSET(cflag, CSIZE)) { 1047 case CS5: 1048 SET(tmp3, ZSWR3_RX_5); 1049 SET(tmp5, ZSWR5_TX_5); 1050 break; 1051 case CS6: 1052 SET(tmp3, ZSWR3_RX_6); 1053 SET(tmp5, ZSWR5_TX_6); 1054 break; 1055 case CS7: 1056 SET(tmp3, ZSWR3_RX_7); 1057 SET(tmp5, ZSWR5_TX_7); 1058 break; 1059 case CS8: 1060 SET(tmp3, ZSWR3_RX_8); 1061 SET(tmp5, ZSWR5_TX_8); 1062 break; 1063 } 1064 cs->cs_preg[3] = tmp3; 1065 cs->cs_preg[5] = tmp5; 1066 1067 /* 1068 * Recompute the stop bits and parity bits. Note that 1069 * zs_set_speed() may have set clock selection bits etc. 1070 * in wr4, so those must preserved. 1071 */ 1072 tmp4 = cs->cs_preg[4]; 1073 CLR(tmp4, ZSWR4_SBMASK | ZSWR4_PARMASK); 1074 if (ISSET(cflag, CSTOPB)) 1075 SET(tmp4, ZSWR4_TWOSB); 1076 else 1077 SET(tmp4, ZSWR4_ONESB); 1078 if (!ISSET(cflag, PARODD)) 1079 SET(tmp4, ZSWR4_EVENP); 1080 if (ISSET(cflag, PARENB)) 1081 SET(tmp4, ZSWR4_PARENB); 1082 cs->cs_preg[4] = tmp4; 1083 1084 /* And copy to tty. */ 1085 tp->t_ispeed = 0; 1086 tp->t_ospeed = ospeed; 1087 tp->t_cflag = cflag; 1088 1089 /* 1090 * If nothing is being transmitted, set up new current values, 1091 * else mark them as pending. 1092 */ 1093 if (!cs->cs_heldchange) { 1094 if (zst->zst_tx_busy) { 1095 zst->zst_heldtbc = zst->zst_tbc; 1096 zst->zst_tbc = 0; 1097 cs->cs_heldchange = 1; 1098 } else 1099 zs_loadchannelregs(cs); 1100 } 1101 1102 /* 1103 * If hardware flow control is disabled, turn off the buffer water 1104 * marks and unblock any soft flow control state. Otherwise, enable 1105 * the water marks. 1106 */ 1107 if (!ISSET(cflag, CHWFLOW)) { 1108 zst->zst_r_hiwat = 0; 1109 zst->zst_r_lowat = 0; 1110 if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1111 CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1112 zst->zst_rx_ready = 1; 1113 cs->cs_softreq = 1; 1114 } 1115 if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 1116 CLR(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 1117 zs_hwiflow(zst); 1118 } 1119 } else { 1120 zst->zst_r_hiwat = zstty_rbuf_hiwat; 1121 zst->zst_r_lowat = zstty_rbuf_lowat; 1122 } 1123 1124 /* 1125 * Force a recheck of the hardware carrier and flow control status, 1126 * since we may have changed which bits we're looking at. 1127 */ 1128 zstty_stint(cs, 1); 1129 1130 splx(s); 1131 1132 /* 1133 * If hardware flow control is disabled, unblock any hard flow control 1134 * state. 1135 */ 1136 if (!ISSET(cflag, CHWFLOW)) { 1137 if (zst->zst_tx_stopped) { 1138 zst->zst_tx_stopped = 0; 1139 zsstart(tp); 1140 } 1141 } 1142 1143 zstty_softint(cs); 1144 1145 return (0); 1146 } 1147 1148 /* 1149 * Compute interupt enable bits and set in the pending bits. Called both 1150 * in zsparam() and when PPS (pulse per second timing) state changes. 1151 * Must be called at splzs(). 1152 */ 1153 static void 1154 zs_maskintr(zst) 1155 struct zstty_softc *zst; 1156 { 1157 struct zs_chanstate *cs = zst->zst_cs; 1158 int tmp15; 1159 1160 cs->cs_rr0_mask = cs->cs_rr0_cts | cs->cs_rr0_dcd; 1161 if (zst->zst_ppsmask != 0) 1162 cs->cs_rr0_mask |= cs->cs_rr0_pps; 1163 tmp15 = cs->cs_preg[15]; 1164 if (ISSET(cs->cs_rr0_mask, ZSRR0_DCD)) 1165 SET(tmp15, ZSWR15_DCD_IE); 1166 else 1167 CLR(tmp15, ZSWR15_DCD_IE); 1168 if (ISSET(cs->cs_rr0_mask, ZSRR0_CTS)) 1169 SET(tmp15, ZSWR15_CTS_IE); 1170 else 1171 CLR(tmp15, ZSWR15_CTS_IE); 1172 cs->cs_preg[15] = tmp15; 1173 } 1174 1175 1176 /* 1177 * Raise or lower modem control (DTR/RTS) signals. If a character is 1178 * in transmission, the change is deferred. 1179 */ 1180 static void 1181 zs_modem(zst, onoff) 1182 struct zstty_softc *zst; 1183 int onoff; 1184 { 1185 struct zs_chanstate *cs = zst->zst_cs; 1186 1187 if (cs->cs_wr5_dtr == 0) 1188 return; 1189 1190 if (onoff) 1191 SET(cs->cs_preg[5], cs->cs_wr5_dtr); 1192 else 1193 CLR(cs->cs_preg[5], cs->cs_wr5_dtr); 1194 1195 if (!cs->cs_heldchange) { 1196 if (zst->zst_tx_busy) { 1197 zst->zst_heldtbc = zst->zst_tbc; 1198 zst->zst_tbc = 0; 1199 cs->cs_heldchange = 1; 1200 } else 1201 zs_loadchannelregs(cs); 1202 } 1203 } 1204 1205 static void 1206 tiocm_to_zs(zst, how, ttybits) 1207 struct zstty_softc *zst; 1208 int how, ttybits; 1209 { 1210 struct zs_chanstate *cs = zst->zst_cs; 1211 u_char zsbits; 1212 1213 zsbits = 0; 1214 if (ISSET(ttybits, TIOCM_DTR)) 1215 SET(zsbits, ZSWR5_DTR); 1216 if (ISSET(ttybits, TIOCM_RTS)) 1217 SET(zsbits, ZSWR5_RTS); 1218 1219 switch (how) { 1220 case TIOCMBIC: 1221 CLR(cs->cs_preg[5], zsbits); 1222 break; 1223 1224 case TIOCMBIS: 1225 SET(cs->cs_preg[5], zsbits); 1226 break; 1227 1228 case TIOCMSET: 1229 CLR(cs->cs_preg[5], ZSWR5_RTS | ZSWR5_DTR); 1230 SET(cs->cs_preg[5], zsbits); 1231 break; 1232 } 1233 1234 if (!cs->cs_heldchange) { 1235 if (zst->zst_tx_busy) { 1236 zst->zst_heldtbc = zst->zst_tbc; 1237 zst->zst_tbc = 0; 1238 cs->cs_heldchange = 1; 1239 } else 1240 zs_loadchannelregs(cs); 1241 } 1242 } 1243 1244 static int 1245 zs_to_tiocm(zst) 1246 struct zstty_softc *zst; 1247 { 1248 struct zs_chanstate *cs = zst->zst_cs; 1249 u_char zsbits; 1250 int ttybits = 0; 1251 1252 zsbits = cs->cs_preg[5]; 1253 if (ISSET(zsbits, ZSWR5_DTR)) 1254 SET(ttybits, TIOCM_DTR); 1255 if (ISSET(zsbits, ZSWR5_RTS)) 1256 SET(ttybits, TIOCM_RTS); 1257 1258 zsbits = cs->cs_rr0; 1259 if (ISSET(zsbits, ZSRR0_DCD)) 1260 SET(ttybits, TIOCM_CD); 1261 if (ISSET(zsbits, ZSRR0_CTS)) 1262 SET(ttybits, TIOCM_CTS); 1263 1264 return (ttybits); 1265 } 1266 1267 /* 1268 * Try to block or unblock input using hardware flow-control. 1269 * This is called by kern/tty.c if MDMBUF|CRTSCTS is set, and 1270 * if this function returns non-zero, the TS_TBLOCK flag will 1271 * be set or cleared according to the "block" arg passed. 1272 */ 1273 int 1274 zshwiflow(tp, block) 1275 struct tty *tp; 1276 int block; 1277 { 1278 struct zstty_softc *zst = zstty_cd.cd_devs[ZSUNIT(tp->t_dev)]; 1279 struct zs_chanstate *cs = zst->zst_cs; 1280 int s; 1281 1282 if (cs->cs_wr5_rts == 0) 1283 return (0); 1284 1285 s = splzs(); 1286 if (block) { 1287 if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1288 SET(zst->zst_rx_flags, RX_TTY_BLOCKED); 1289 zs_hwiflow(zst); 1290 } 1291 } else { 1292 if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1293 CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1294 zst->zst_rx_ready = 1; 1295 cs->cs_softreq = 1; 1296 } 1297 if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1298 CLR(zst->zst_rx_flags, RX_TTY_BLOCKED); 1299 zs_hwiflow(zst); 1300 } 1301 } 1302 splx(s); 1303 return (1); 1304 } 1305 1306 /* 1307 * Internal version of zshwiflow 1308 * called at splzs 1309 */ 1310 static void 1311 zs_hwiflow(zst) 1312 struct zstty_softc *zst; 1313 { 1314 struct zs_chanstate *cs = zst->zst_cs; 1315 1316 if (cs->cs_wr5_rts == 0) 1317 return; 1318 1319 if (ISSET(zst->zst_rx_flags, RX_ANY_BLOCK)) { 1320 CLR(cs->cs_preg[5], cs->cs_wr5_rts); 1321 CLR(cs->cs_creg[5], cs->cs_wr5_rts); 1322 } else { 1323 SET(cs->cs_preg[5], cs->cs_wr5_rts); 1324 SET(cs->cs_creg[5], cs->cs_wr5_rts); 1325 } 1326 zs_write_reg(cs, 5, cs->cs_creg[5]); 1327 } 1328 1329 1330 /**************************************************************** 1331 * Interface to the lower layer (zscc) 1332 ****************************************************************/ 1333 1334 #define integrate static inline 1335 integrate void zstty_rxsoft __P((struct zstty_softc *, struct tty *)); 1336 integrate void zstty_txsoft __P((struct zstty_softc *, struct tty *)); 1337 integrate void zstty_stsoft __P((struct zstty_softc *, struct tty *)); 1338 static void zstty_diag __P((void *)); 1339 1340 /* 1341 * receiver ready interrupt. 1342 * called at splzs 1343 */ 1344 static void 1345 zstty_rxint(cs) 1346 struct zs_chanstate *cs; 1347 { 1348 struct zstty_softc *zst = cs->cs_private; 1349 u_char *put, *end; 1350 u_int cc; 1351 u_char rr0, rr1, c; 1352 1353 end = zst->zst_ebuf; 1354 put = zst->zst_rbput; 1355 cc = zst->zst_rbavail; 1356 1357 while (cc > 0) { 1358 /* 1359 * First read the status, because reading the received char 1360 * destroys the status of this char. 1361 */ 1362 rr1 = zs_read_reg(cs, 1); 1363 c = zs_read_data(cs); 1364 1365 if (ISSET(rr1, ZSRR1_FE | ZSRR1_DO | ZSRR1_PE)) { 1366 /* Clear the receive error. */ 1367 zs_write_csr(cs, ZSWR0_RESET_ERRORS); 1368 } 1369 1370 put[0] = c; 1371 put[1] = rr1; 1372 put += 2; 1373 if (put >= end) 1374 put = zst->zst_rbuf; 1375 cc--; 1376 1377 rr0 = zs_read_csr(cs); 1378 if (!ISSET(rr0, ZSRR0_RX_READY)) 1379 break; 1380 } 1381 1382 /* 1383 * Current string of incoming characters ended because 1384 * no more data was available or we ran out of space. 1385 * Schedule a receive event if any data was received. 1386 * If we're out of space, turn off receive interrupts. 1387 */ 1388 zst->zst_rbput = put; 1389 zst->zst_rbavail = cc; 1390 if (!ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1391 zst->zst_rx_ready = 1; 1392 cs->cs_softreq = 1; 1393 } 1394 1395 /* 1396 * See if we are in danger of overflowing a buffer. If 1397 * so, use hardware flow control to ease the pressure. 1398 */ 1399 if (!ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED) && 1400 cc < zst->zst_r_hiwat) { 1401 SET(zst->zst_rx_flags, RX_IBUF_BLOCKED); 1402 zs_hwiflow(zst); 1403 } 1404 1405 /* 1406 * If we're out of space, disable receive interrupts 1407 * until the queue has drained a bit. 1408 */ 1409 if (!cc) { 1410 SET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED); 1411 CLR(cs->cs_preg[1], ZSWR1_RIE); 1412 cs->cs_creg[1] = cs->cs_preg[1]; 1413 zs_write_reg(cs, 1, cs->cs_creg[1]); 1414 } 1415 1416 #if 0 1417 printf("%xH%04d\n", zst->zst_rx_flags, zst->zst_rbavail); 1418 #endif 1419 } 1420 1421 /* 1422 * transmitter ready interrupt. (splzs) 1423 */ 1424 static void 1425 zstty_txint(cs) 1426 struct zs_chanstate *cs; 1427 { 1428 struct zstty_softc *zst = cs->cs_private; 1429 1430 /* 1431 * If we've delayed a parameter change, do it now, and restart 1432 * output. 1433 */ 1434 if (cs->cs_heldchange) { 1435 zs_loadchannelregs(cs); 1436 cs->cs_heldchange = 0; 1437 zst->zst_tbc = zst->zst_heldtbc; 1438 zst->zst_heldtbc = 0; 1439 } 1440 1441 /* Output the next character in the buffer, if any. */ 1442 if (zst->zst_tbc > 0) { 1443 zs_write_data(cs, *zst->zst_tba); 1444 zst->zst_tbc--; 1445 zst->zst_tba++; 1446 } else { 1447 /* Disable transmit completion interrupts if necessary. */ 1448 if (ISSET(cs->cs_preg[1], ZSWR1_TIE)) { 1449 CLR(cs->cs_preg[1], ZSWR1_TIE); 1450 cs->cs_creg[1] = cs->cs_preg[1]; 1451 zs_write_reg(cs, 1, cs->cs_creg[1]); 1452 } 1453 if (zst->zst_tx_busy) { 1454 zst->zst_tx_busy = 0; 1455 zst->zst_tx_done = 1; 1456 cs->cs_softreq = 1; 1457 } 1458 } 1459 } 1460 1461 /* 1462 * status change interrupt. (splzs) 1463 */ 1464 static void 1465 zstty_stint(cs, force) 1466 struct zs_chanstate *cs; 1467 int force; 1468 { 1469 struct zstty_softc *zst = cs->cs_private; 1470 u_char rr0, delta; 1471 1472 rr0 = zs_read_csr(cs); 1473 zs_write_csr(cs, ZSWR0_RESET_STATUS); 1474 1475 /* 1476 * Check here for console break, so that we can abort 1477 * even when interrupts are locking up the machine. 1478 */ 1479 if (ISSET(rr0, ZSRR0_BREAK) && 1480 ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 1481 zs_abort(cs); 1482 return; 1483 } 1484 1485 if (!force) 1486 delta = rr0 ^ cs->cs_rr0; 1487 else 1488 delta = cs->cs_rr0_mask; 1489 cs->cs_rr0 = rr0; 1490 1491 if (ISSET(delta, cs->cs_rr0_mask)) { 1492 SET(cs->cs_rr0_delta, delta); 1493 1494 /* 1495 * Pulse-per-second clock signal on edge of DCD? 1496 */ 1497 if (ISSET(delta, zst->zst_ppsmask)) { 1498 struct timeval tv; 1499 if (ISSET(rr0, zst->zst_ppsmask) == zst->zst_ppsassert) { 1500 /* XXX nanotime() */ 1501 microtime(&tv); 1502 TIMEVAL_TO_TIMESPEC(&tv, 1503 &zst->ppsinfo.assert_timestamp); 1504 if (zst->ppsparam.mode & PPS_OFFSETASSERT) { 1505 timespecadd(&zst->ppsinfo.assert_timestamp, 1506 &zst->ppsparam.assert_offset, 1507 &zst->ppsinfo.assert_timestamp); 1508 } 1509 1510 #ifdef PPS_SYNC 1511 if (zst->ppsparam.mode & PPS_HARDPPSONASSERT) 1512 hardpps(&tv, tv.tv_usec); 1513 #endif 1514 zst->ppsinfo.assert_sequence++; 1515 zst->ppsinfo.current_mode = zst->ppsparam.mode; 1516 } else if (ISSET(rr0, zst->zst_ppsmask) == 1517 zst->zst_ppsclear) { 1518 /* XXX nanotime() */ 1519 microtime(&tv); 1520 TIMEVAL_TO_TIMESPEC(&tv, 1521 &zst->ppsinfo.clear_timestamp); 1522 if (zst->ppsparam.mode & PPS_OFFSETCLEAR) { 1523 timespecadd(&zst->ppsinfo.clear_timestamp, 1524 &zst->ppsparam.clear_offset, 1525 &zst->ppsinfo.clear_timestamp); 1526 } 1527 1528 #ifdef PPS_SYNC 1529 if (zst->ppsparam.mode & PPS_HARDPPSONCLEAR) 1530 hardpps(&tv, tv.tv_usec); 1531 #endif 1532 zst->ppsinfo.clear_sequence++; 1533 zst->ppsinfo.current_mode = zst->ppsparam.mode; 1534 } 1535 } 1536 1537 /* 1538 * Stop output immediately if we lose the output 1539 * flow control signal or carrier detect. 1540 */ 1541 if (ISSET(~rr0, cs->cs_rr0_mask)) { 1542 zst->zst_tbc = 0; 1543 zst->zst_heldtbc = 0; 1544 } 1545 1546 zst->zst_st_check = 1; 1547 cs->cs_softreq = 1; 1548 } 1549 } 1550 1551 void 1552 zstty_diag(arg) 1553 void *arg; 1554 { 1555 struct zstty_softc *zst = arg; 1556 int overflows, floods; 1557 int s; 1558 1559 s = splzs(); 1560 overflows = zst->zst_overflows; 1561 zst->zst_overflows = 0; 1562 floods = zst->zst_floods; 1563 zst->zst_floods = 0; 1564 zst->zst_errors = 0; 1565 splx(s); 1566 1567 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1568 zst->zst_dev.dv_xname, 1569 overflows, overflows == 1 ? "" : "s", 1570 floods, floods == 1 ? "" : "s"); 1571 } 1572 1573 integrate void 1574 zstty_rxsoft(zst, tp) 1575 struct zstty_softc *zst; 1576 struct tty *tp; 1577 { 1578 struct zs_chanstate *cs = zst->zst_cs; 1579 int (*rint) __P((int c, struct tty *tp)) = linesw[tp->t_line].l_rint; 1580 u_char *get, *end; 1581 u_int cc, scc; 1582 u_char rr1; 1583 int code; 1584 int s; 1585 1586 end = zst->zst_ebuf; 1587 get = zst->zst_rbget; 1588 scc = cc = zstty_rbuf_size - zst->zst_rbavail; 1589 1590 if (cc == zstty_rbuf_size) { 1591 zst->zst_floods++; 1592 if (zst->zst_errors++ == 0) 1593 timeout(zstty_diag, zst, 60 * hz); 1594 } 1595 1596 /* If not yet open, drop the entire buffer content here */ 1597 if (!ISSET(tp->t_state, TS_ISOPEN)) { 1598 get += cc << 1; 1599 if (get >= end) 1600 get -= zstty_rbuf_size << 1; 1601 cc = 0; 1602 } 1603 while (cc) { 1604 code = get[0]; 1605 rr1 = get[1]; 1606 if (ISSET(rr1, ZSRR1_DO | ZSRR1_FE | ZSRR1_PE)) { 1607 if (ISSET(rr1, ZSRR1_DO)) { 1608 zst->zst_overflows++; 1609 if (zst->zst_errors++ == 0) 1610 timeout(zstty_diag, zst, 60 * hz); 1611 } 1612 if (ISSET(rr1, ZSRR1_FE)) 1613 SET(code, TTY_FE); 1614 if (ISSET(rr1, ZSRR1_PE)) 1615 SET(code, TTY_PE); 1616 } 1617 if ((*rint)(code, tp) == -1) { 1618 /* 1619 * The line discipline's buffer is out of space. 1620 */ 1621 if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1622 /* 1623 * We're either not using flow control, or the 1624 * line discipline didn't tell us to block for 1625 * some reason. Either way, we have no way to 1626 * know when there's more space available, so 1627 * just drop the rest of the data. 1628 */ 1629 get += cc << 1; 1630 if (get >= end) 1631 get -= zstty_rbuf_size << 1; 1632 cc = 0; 1633 } else { 1634 /* 1635 * Don't schedule any more receive processing 1636 * until the line discipline tells us there's 1637 * space available (through comhwiflow()). 1638 * Leave the rest of the data in the input 1639 * buffer. 1640 */ 1641 SET(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1642 } 1643 break; 1644 } 1645 get += 2; 1646 if (get >= end) 1647 get = zst->zst_rbuf; 1648 cc--; 1649 } 1650 1651 if (cc != scc) { 1652 zst->zst_rbget = get; 1653 s = splzs(); 1654 cc = zst->zst_rbavail += scc - cc; 1655 /* Buffers should be ok again, release possible block. */ 1656 if (cc >= zst->zst_r_lowat) { 1657 if (ISSET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED)) { 1658 CLR(zst->zst_rx_flags, RX_IBUF_OVERFLOWED); 1659 SET(cs->cs_preg[1], ZSWR1_RIE); 1660 cs->cs_creg[1] = cs->cs_preg[1]; 1661 zs_write_reg(cs, 1, cs->cs_creg[1]); 1662 } 1663 if (ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED)) { 1664 CLR(zst->zst_rx_flags, RX_IBUF_BLOCKED); 1665 zs_hwiflow(zst); 1666 } 1667 } 1668 splx(s); 1669 } 1670 1671 #if 0 1672 printf("%xS%04d\n", zst->zst_rx_flags, zst->zst_rbavail); 1673 #endif 1674 } 1675 1676 integrate void 1677 zstty_txsoft(zst, tp) 1678 struct zstty_softc *zst; 1679 struct tty *tp; 1680 { 1681 1682 CLR(tp->t_state, TS_BUSY); 1683 if (ISSET(tp->t_state, TS_FLUSH)) 1684 CLR(tp->t_state, TS_FLUSH); 1685 else 1686 ndflush(&tp->t_outq, (int)(zst->zst_tba - tp->t_outq.c_cf)); 1687 (*linesw[tp->t_line].l_start)(tp); 1688 } 1689 1690 integrate void 1691 zstty_stsoft(zst, tp) 1692 struct zstty_softc *zst; 1693 struct tty *tp; 1694 { 1695 struct zs_chanstate *cs = zst->zst_cs; 1696 u_char rr0, delta; 1697 int s; 1698 1699 s = splzs(); 1700 rr0 = cs->cs_rr0; 1701 delta = cs->cs_rr0_delta; 1702 cs->cs_rr0_delta = 0; 1703 splx(s); 1704 1705 if (ISSET(delta, cs->cs_rr0_dcd)) { 1706 /* 1707 * Inform the tty layer that carrier detect changed. 1708 */ 1709 (void) (*linesw[tp->t_line].l_modem)(tp, ISSET(rr0, ZSRR0_DCD)); 1710 } 1711 1712 if (ISSET(delta, cs->cs_rr0_cts)) { 1713 /* Block or unblock output according to flow control. */ 1714 if (ISSET(rr0, cs->cs_rr0_cts)) { 1715 zst->zst_tx_stopped = 0; 1716 (*linesw[tp->t_line].l_start)(tp); 1717 } else { 1718 zst->zst_tx_stopped = 1; 1719 } 1720 } 1721 } 1722 1723 /* 1724 * Software interrupt. Called at zssoft 1725 * 1726 * The main job to be done here is to empty the input ring 1727 * by passing its contents up to the tty layer. The ring is 1728 * always emptied during this operation, therefore the ring 1729 * must not be larger than the space after "high water" in 1730 * the tty layer, or the tty layer might drop our input. 1731 * 1732 * Note: an "input blockage" condition is assumed to exist if 1733 * EITHER the TS_TBLOCK flag or zst_rx_blocked flag is set. 1734 */ 1735 static void 1736 zstty_softint(cs) 1737 struct zs_chanstate *cs; 1738 { 1739 struct zstty_softc *zst = cs->cs_private; 1740 struct tty *tp = zst->zst_tty; 1741 int s; 1742 1743 s = spltty(); 1744 1745 if (zst->zst_rx_ready) { 1746 zst->zst_rx_ready = 0; 1747 zstty_rxsoft(zst, tp); 1748 } 1749 1750 if (zst->zst_st_check) { 1751 zst->zst_st_check = 0; 1752 zstty_stsoft(zst, tp); 1753 } 1754 1755 if (zst->zst_tx_done) { 1756 zst->zst_tx_done = 0; 1757 zstty_txsoft(zst, tp); 1758 } 1759 1760 splx(s); 1761 } 1762 1763 struct zsops zsops_tty = { 1764 zstty_rxint, /* receive char available */ 1765 zstty_stint, /* external/status */ 1766 zstty_txint, /* xmit buffer empty */ 1767 zstty_softint, /* process software interrupt */ 1768 }; 1769
Indexes created Mon Sep 29 18:09:42 GMT 2025