z8530tty.c revision 1.133
1/* $NetBSD: z8530tty.c,v 1.133 2019/07/21 16:10:37 rin 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@NetBSD.org>, 132 * Bill Studenmund <wrstuden@loki.stanford.edu> 133 * Ian Dall <Ian.Dall@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 1.133 2019/07/21 16:10:37 rin Exp $"); 141 142#include "opt_kgdb.h" 143#include "opt_ntp.h" 144 145#include <sys/param.h> 146#include <sys/systm.h> 147#include <sys/proc.h> 148#include <sys/device.h> 149#include <sys/conf.h> 150#include <sys/file.h> 151#include <sys/ioctl.h> 152#include <sys/malloc.h> 153#include <sys/timepps.h> 154#include <sys/tty.h> 155#include <sys/time.h> 156#include <sys/kernel.h> 157#include <sys/syslog.h> 158#include <sys/kauth.h> 159 160#include <dev/ic/z8530reg.h> 161#include <machine/z8530var.h> 162 163#include <dev/cons.h> 164 165#include "ioconf.h" 166#include "locators.h" 167 168/* 169 * How many input characters we can buffer. 170 * The port-specific var.h may override this. 171 * Note: must be a power of two! 172 */ 173#ifndef ZSTTY_RING_SIZE 174#define ZSTTY_RING_SIZE 2048 175#endif 176 177static struct cnm_state zstty_cnm_state; 178/* 179 * Make this an option variable one can patch. 180 * But be warned: this must be a power of 2! 181 */ 182u_int zstty_rbuf_size = ZSTTY_RING_SIZE; 183 184/* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */ 185u_int zstty_rbuf_hiwat = (ZSTTY_RING_SIZE * 1) / 4; 186u_int zstty_rbuf_lowat = (ZSTTY_RING_SIZE * 3) / 4; 187 188struct zstty_softc { 189 device_t zst_dev; /* required first: base device */ 190 struct tty *zst_tty; 191 struct zs_chanstate *zst_cs; 192 193 struct callout zst_diag_ch; 194 195 u_int zst_overflows, 196 zst_floods, 197 zst_errors; 198 199 int zst_hwflags, /* see z8530var.h */ 200 zst_swflags; /* TIOCFLAG_SOFTCAR, ... <ttycom.h> */ 201 202 u_int zst_r_hiwat, 203 zst_r_lowat; 204 uint8_t *volatile zst_rbget, 205 *volatile zst_rbput; 206 volatile u_int zst_rbavail; 207 uint8_t *zst_rbuf, 208 *zst_ebuf; 209 210 /* 211 * The transmit byte count and address are used for pseudo-DMA 212 * output in the hardware interrupt code. PDMA can be suspended 213 * to get pending changes done; heldtbc is used for this. It can 214 * also be stopped for ^S; this sets TS_TTSTOP in tp->t_state. 215 */ 216 uint8_t *zst_tba; /* transmit buffer address */ 217 u_int zst_tbc, /* transmit byte count */ 218 zst_heldtbc; /* held tbc while xmission stopped */ 219 220 /* Flags to communicate with zstty_softint() */ 221 volatile uint8_t zst_rx_flags, /* receiver blocked */ 222#define RX_TTY_BLOCKED 0x01 223#define RX_TTY_OVERFLOWED 0x02 224#define RX_IBUF_BLOCKED 0x04 225#define RX_IBUF_OVERFLOWED 0x08 226#define RX_ANY_BLOCK 0x0f 227 zst_tx_busy, /* working on an output chunk */ 228 zst_tx_done, /* done with one output chunk */ 229 zst_tx_stopped, /* H/W level stop (lost CTS) */ 230 zst_st_check, /* got a status interrupt */ 231 zst_rx_ready; 232 233 /* PPS signal on DCD, with or without inkernel clock disciplining */ 234 uint8_t zst_ppsmask; /* pps signal mask */ 235 struct pps_state zst_pps_state; 236}; 237 238/* Definition of the driver for autoconfig. */ 239static int zstty_match(device_t, cfdata_t, void *); 240static void zstty_attach(device_t, device_t, void *); 241 242CFATTACH_DECL_NEW(zstty, sizeof(struct zstty_softc), 243 zstty_match, zstty_attach, NULL, NULL); 244 245dev_type_open(zsopen); 246dev_type_close(zsclose); 247dev_type_read(zsread); 248dev_type_write(zswrite); 249dev_type_ioctl(zsioctl); 250dev_type_stop(zsstop); 251dev_type_tty(zstty); 252dev_type_poll(zspoll); 253 254const struct cdevsw zstty_cdevsw = { 255 .d_open = zsopen, 256 .d_close = zsclose, 257 .d_read = zsread, 258 .d_write = zswrite, 259 .d_ioctl = zsioctl, 260 .d_stop = zsstop, 261 .d_tty = zstty, 262 .d_poll = zspoll, 263 .d_mmap = nommap, 264 .d_kqfilter = ttykqfilter, 265 .d_discard = nodiscard, 266 .d_flag = D_TTY 267}; 268 269struct zsops zsops_tty; 270 271static void zs_shutdown(struct zstty_softc *); 272static void zsstart(struct tty *); 273static int zsparam(struct tty *, struct termios *); 274static void zs_modem(struct zstty_softc *, int); 275static void tiocm_to_zs(struct zstty_softc *, u_long, int); 276static int zs_to_tiocm(struct zstty_softc *); 277static int zshwiflow(struct tty *, int); 278static void zs_hwiflow(struct zstty_softc *); 279static void zs_maskintr(struct zstty_softc *); 280 281/* Low-level routines. */ 282static void zstty_rxint (struct zs_chanstate *); 283static void zstty_stint (struct zs_chanstate *, int); 284static void zstty_txint (struct zs_chanstate *); 285static void zstty_softint(struct zs_chanstate *); 286static void zstty_softint1(struct zs_chanstate *); 287 288#define ZSUNIT(x) TTUNIT(x) 289#define ZSDIALOUT(x) TTDIALOUT(x) 290 291struct tty *zstty_get_tty_from_dev(device_t); 292 293/* 294 * XXX get the (struct tty *) out of a (device_t) we trust to be a 295 * (struct zstty_softc *) - needed by sparc/dev/zs.c, sparc64/dev/zs.c, 296 * sun3/dev/zs.c and sun2/dev/zs.c will probably need it at some point 297 */ 298 299struct tty * 300zstty_get_tty_from_dev(device_t dev) 301{ 302 struct zstty_softc *sc = device_private(dev); 303 304 return sc->zst_tty; 305} 306 307/* 308 * zstty_match: how is this zs channel configured? 309 */ 310int 311zstty_match(device_t parent, cfdata_t cf, void *aux) 312{ 313 struct zsc_attach_args *args = aux; 314 315 /* Exact match is better than wildcard. */ 316 if (cf->zsccf_channel == args->channel) 317 return 2; 318 319 /* This driver accepts wildcard. */ 320 if (cf->zsccf_channel == ZSCCF_CHANNEL_DEFAULT) 321 return 1; 322 323 return 0; 324} 325 326void 327zstty_attach(device_t parent, device_t self, void *aux) 328{ 329 struct zstty_softc *zst = device_private(self); 330 struct zsc_softc *zsc = device_private(parent); 331 cfdata_t cf = device_cfdata(self); 332 struct zsc_attach_args *args = aux; 333 struct zs_chanstate *cs; 334 struct tty *tp; 335 int channel, tty_unit; 336 dev_t dev; 337 const char *i, *o; 338 int dtr_on; 339 int resetbit; 340 341 zst->zst_dev = self; 342 343 callout_init(&zst->zst_diag_ch, 0); 344 cn_init_magic(&zstty_cnm_state); 345 346 tty_unit = device_unit(self); 347 channel = args->channel; 348 cs = zsc->zsc_cs[channel]; 349 cs->cs_private = zst; 350 cs->cs_ops = &zsops_tty; 351 352 zst->zst_cs = cs; 353 zst->zst_swflags = cf->cf_flags; /* softcar, etc. */ 354 zst->zst_hwflags = args->hwflags; 355 dev = makedev(cdevsw_lookup_major(&zstty_cdevsw), tty_unit); 356 357 if (zst->zst_swflags) 358 aprint_normal(" flags 0x%x", zst->zst_swflags); 359 360 /* 361 * Check whether we serve as a console device. 362 * XXX - split console input/output channels aren't 363 * supported yet on /dev/console 364 */ 365 i = o = NULL; 366 if ((zst->zst_hwflags & ZS_HWFLAG_CONSOLE_INPUT) != 0) { 367 i = "input"; 368 if ((args->hwflags & ZS_HWFLAG_USE_CONSDEV) != 0) { 369 args->consdev->cn_dev = dev; 370 cn_tab->cn_pollc = args->consdev->cn_pollc; 371 cn_tab->cn_getc = args->consdev->cn_getc; 372 } 373 cn_tab->cn_dev = dev; 374 /* Set console magic to BREAK */ 375 cn_set_magic("\047\001"); 376 } 377 if ((zst->zst_hwflags & ZS_HWFLAG_CONSOLE_OUTPUT) != 0) { 378 o = "output"; 379 if ((args->hwflags & ZS_HWFLAG_USE_CONSDEV) != 0) { 380 cn_tab->cn_putc = args->consdev->cn_putc; 381 } 382 cn_tab->cn_dev = dev; 383 } 384 if (i != NULL || o != NULL) 385 aprint_normal(" (console %s)", i ? (o ? "i/o" : i) : o); 386 387#ifdef KGDB 388 if (zs_check_kgdb(cs, dev)) { 389 /* 390 * Allow kgdb to "take over" this port. Returns true 391 * if this serial port is in-use by kgdb. 392 */ 393 aprint_normal(" (kgdb)\n"); 394 /* 395 * This is the kgdb port (exclusive use) 396 * so skip the normal attach code. 397 */ 398 return; 399 } 400#endif 401 aprint_normal("\n"); 402 403 tp = tty_alloc(); 404 tp->t_dev = dev; 405 tp->t_oproc = zsstart; 406 tp->t_param = zsparam; 407 tp->t_hwiflow = zshwiflow; 408 tty_attach(tp); 409 410 zst->zst_tty = tp; 411 zst->zst_rbuf = malloc(zstty_rbuf_size << 1, M_DEVBUF, M_NOWAIT); 412 if (zst->zst_rbuf == NULL) { 413 aprint_error_dev(zst->zst_dev, 414 "unable to allocate ring buffer\n"); 415 return; 416 } 417 zst->zst_ebuf = zst->zst_rbuf + (zstty_rbuf_size << 1); 418 /* Disable the high water mark. */ 419 zst->zst_r_hiwat = 0; 420 zst->zst_r_lowat = 0; 421 zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf; 422 zst->zst_rbavail = zstty_rbuf_size; 423 424 /* if there are no enable/disable functions, assume the device 425 is always enabled */ 426 if (!cs->enable) 427 cs->enabled = 1; 428 429 /* 430 * Hardware init 431 */ 432 dtr_on = 0; 433 resetbit = 0; 434 if (ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 435 /* Call zsparam similar to open. */ 436 struct termios t; 437 438 /* Wait a while for previous console output to complete */ 439 DELAY(10000); 440 441 /* Setup the "new" parameters in t. */ 442 t.c_ispeed = 0; 443 t.c_ospeed = cs->cs_defspeed; 444 t.c_cflag = cs->cs_defcflag; 445 446 /* 447 * Turn on receiver and status interrupts. 448 * We defer the actual write of the register to zsparam(), 449 * but we must make sure status interrupts are turned on by 450 * the time zsparam() reads the initial rr0 state. 451 */ 452 SET(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_TIE | ZSWR1_SIE); 453 454 /* Make sure zsparam will see changes. */ 455 tp->t_ospeed = 0; 456 (void) zsparam(tp, &t); 457 458 /* Make sure DTR is on now. */ 459 dtr_on = 1; 460 461 } else if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_NORESET)) { 462 /* Not the console; may need reset. */ 463 resetbit = (channel == 0) ? ZSWR9_A_RESET : ZSWR9_B_RESET; 464 } 465 466 mutex_spin_enter(&cs->cs_lock); 467 if (resetbit) 468 zs_write_reg(cs, 9, resetbit); 469 zs_modem(zst, dtr_on); 470 mutex_spin_exit(&cs->cs_lock); 471} 472 473 474/* 475 * Return pointer to our tty. 476 */ 477struct tty * 478zstty(dev_t dev) 479{ 480 struct zstty_softc *zst; 481 482 zst = device_lookup_private(&zstty_cd, ZSUNIT(dev)); 483 484 return (zst->zst_tty); 485} 486 487 488void 489zs_shutdown(struct zstty_softc *zst) 490{ 491 struct zs_chanstate *cs = zst->zst_cs; 492 struct tty *tp = zst->zst_tty; 493 494 mutex_spin_enter(&cs->cs_lock); 495 496 /* If we were asserting flow control, then deassert it. */ 497 SET(zst->zst_rx_flags, RX_IBUF_BLOCKED); 498 zs_hwiflow(zst); 499 500 /* Clear any break condition set with TIOCSBRK. */ 501 zs_break(cs, 0); 502 503 /* 504 * Hang up if necessary. Wait a bit, so the other side has time to 505 * notice even if we immediately open the port again. 506 */ 507 if (ISSET(tp->t_cflag, HUPCL)) { 508 zs_modem(zst, 0); 509 mutex_spin_exit(&cs->cs_lock); 510 /* 511 * XXX - another process is not prevented from opening 512 * the device during our sleep. 513 */ 514 (void) tsleep(cs, TTIPRI, ttclos, hz); 515 /* Re-check state in case we were opened during our sleep */ 516 if (ISSET(tp->t_state, TS_ISOPEN) || tp->t_wopen != 0) 517 return; 518 519 mutex_spin_enter(&cs->cs_lock); 520 } 521 522 /* Turn off interrupts if not the console. */ 523 if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 524 CLR(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_TIE | ZSWR1_SIE); 525 cs->cs_creg[1] = cs->cs_preg[1]; 526 zs_write_reg(cs, 1, cs->cs_creg[1]); 527 } 528 529 /* Call the power management hook. */ 530 if (cs->disable) { 531#ifdef DIAGNOSTIC 532 if (!cs->enabled) 533 panic("%s: not enabled?", __func__); 534#endif 535 (*cs->disable)(zst->zst_cs); 536 } 537 538 mutex_spin_exit(&cs->cs_lock); 539} 540 541/* 542 * Open a zs serial (tty) port. 543 */ 544int 545zsopen(dev_t dev, int flags, int mode, struct lwp *l) 546{ 547 struct zstty_softc *zst; 548 struct zs_chanstate *cs; 549 struct tty *tp; 550 int error; 551 552 zst = device_lookup_private(&zstty_cd, ZSUNIT(dev)); 553 if (zst == NULL) 554 return (ENXIO); 555 556 tp = zst->zst_tty; 557 cs = zst->zst_cs; 558 559 /* If KGDB took the line, then tp==NULL */ 560 if (tp == NULL) 561 return (EBUSY); 562 563 /* 564 * If the device is exclusively for kernel use, deny userland 565 * open. 566 */ 567 if (ISSET(tp->t_state, TS_KERN_ONLY)) 568 return (EBUSY); 569 570 if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp)) 571 return (EBUSY); 572 573 mutex_spin_enter(&tty_lock); 574 575 /* 576 * Do the following iff this is a first open. 577 */ 578 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 579 struct termios t; 580 581 tp->t_dev = dev; 582 583 /* Call the power management hook. */ 584 if (cs->enable) { 585 if ((*cs->enable)(cs)) { 586 mutex_spin_exit(&tty_lock); 587 printf("%s: device enable failed\n", 588 device_xname(zst->zst_dev)); 589 return (EIO); 590 } 591 } 592 593 /* 594 * Initialize the termios status to the defaults. Add in the 595 * sticky bits from TIOCSFLAGS. 596 */ 597 t.c_ispeed = 0; 598 t.c_ospeed = cs->cs_defspeed; 599 t.c_cflag = cs->cs_defcflag; 600 if (ISSET(zst->zst_swflags, TIOCFLAG_CLOCAL)) 601 SET(t.c_cflag, CLOCAL); 602 if (ISSET(zst->zst_swflags, TIOCFLAG_CRTSCTS)) 603 SET(t.c_cflag, CRTSCTS); 604 if (ISSET(zst->zst_swflags, TIOCFLAG_CDTRCTS)) 605 SET(t.c_cflag, CDTRCTS); 606 if (ISSET(zst->zst_swflags, TIOCFLAG_MDMBUF)) 607 SET(t.c_cflag, MDMBUF); 608 609 mutex_spin_enter(&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_TIE | ZSWR1_SIE); 618 619 /* Clear PPS capture state on first open. */ 620 mutex_spin_enter(&timecounter_lock); 621 zst->zst_ppsmask = 0; 622 memset(&zst->zst_pps_state, 0, sizeof(zst->zst_pps_state)); 623 zst->zst_pps_state.ppscap = 624 PPS_CAPTUREASSERT | PPS_CAPTURECLEAR; 625 pps_init(&zst->zst_pps_state); 626 mutex_spin_exit(&timecounter_lock); 627 628 mutex_spin_exit(&cs->cs_lock); 629 630 /* Make sure zsparam will see changes. */ 631 tp->t_ospeed = 0; 632 mutex_spin_exit(&tty_lock); 633 (void) zsparam(tp, &t); 634 mutex_spin_enter(&tty_lock); 635 636 /* 637 * Note: zsparam has done: cflag, ispeed, ospeed 638 * so we just need to do: iflag, oflag, lflag, cc 639 * For "raw" mode, just leave all zeros. 640 */ 641 if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_RAW)) { 642 tp->t_iflag = TTYDEF_IFLAG; 643 tp->t_oflag = TTYDEF_OFLAG; 644 tp->t_lflag = TTYDEF_LFLAG; 645 } else { 646 tp->t_iflag = 0; 647 tp->t_oflag = 0; 648 tp->t_lflag = 0; 649 } 650 ttychars(tp); 651 ttsetwater(tp); 652 653 mutex_spin_enter(&cs->cs_lock); 654 655 /* 656 * Turn on DTR. We must always do this, even if carrier is not 657 * present, because otherwise we'd have to use TIOCSDTR 658 * immediately after setting CLOCAL, which applications do not 659 * expect. We always assert DTR while the device is open 660 * unless explicitly requested to deassert it. 661 */ 662 zs_modem(zst, 1); 663 664 /* Clear the input ring, and unblock. */ 665 zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf; 666 zst->zst_rbavail = zstty_rbuf_size; 667 zs_iflush(cs); 668 CLR(zst->zst_rx_flags, RX_ANY_BLOCK); 669 zs_hwiflow(zst); 670 671 mutex_spin_exit(&cs->cs_lock); 672 } 673 674 mutex_spin_exit(&tty_lock); 675 676 error = ttyopen(tp, ZSDIALOUT(dev), ISSET(flags, O_NONBLOCK)); 677 if (error) 678 goto bad; 679 680 error = (*tp->t_linesw->l_open)(dev, tp); 681 if (error) 682 goto bad; 683 684 return (0); 685 686bad: 687 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 688 /* 689 * We failed to open the device, and nobody else had it opened. 690 * Clean up the state as appropriate. 691 */ 692 zs_shutdown(zst); 693 } 694 695 return (error); 696} 697 698/* 699 * Close a zs serial port. 700 */ 701int 702zsclose(dev_t dev, int flags, int mode, struct lwp *l) 703{ 704 struct zstty_softc *zst; 705 struct tty *tp; 706 707 zst = device_lookup_private(&zstty_cd, ZSUNIT(dev)); 708 tp = zst->zst_tty; 709 710 /* XXX This is for cons.c. */ 711 if (!ISSET(tp->t_state, TS_ISOPEN)) 712 return 0; 713 714 (*tp->t_linesw->l_close)(tp, flags); 715 ttyclose(tp); 716 717 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 718 /* 719 * Although we got a last close, the device may still be in 720 * use; e.g. if this was the dialout node, and there are still 721 * processes waiting for carrier on the non-dialout node. 722 */ 723 zs_shutdown(zst); 724 } 725 726 return (0); 727} 728 729/* 730 * Read/write zs serial port. 731 */ 732int 733zsread(dev_t dev, struct uio *uio, int flags) 734{ 735 struct zstty_softc *zst; 736 struct tty *tp; 737 738 zst = device_lookup_private(&zstty_cd, ZSUNIT(dev)); 739 tp = zst->zst_tty; 740 741 return ((*tp->t_linesw->l_read)(tp, uio, flags)); 742} 743 744int 745zswrite(dev_t dev, struct uio *uio, int flags) 746{ 747 struct zstty_softc *zst; 748 struct tty *tp; 749 750 zst = device_lookup_private(&zstty_cd, ZSUNIT(dev)); 751 tp = zst->zst_tty; 752 753 return ((*tp->t_linesw->l_write)(tp, uio, flags)); 754} 755 756int 757zspoll(dev_t dev, int events, struct lwp *l) 758{ 759 struct zstty_softc *zst; 760 struct tty *tp; 761 762 zst = device_lookup_private(&zstty_cd, ZSUNIT(dev)); 763 tp = zst->zst_tty; 764 765 return ((*tp->t_linesw->l_poll)(tp, events, l)); 766} 767 768int 769zsioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 770{ 771 struct zstty_softc *zst; 772 struct zs_chanstate *cs; 773 struct tty *tp; 774 int error; 775 776 zst = device_lookup_private(&zstty_cd, ZSUNIT(dev)); 777 cs = zst->zst_cs; 778 tp = zst->zst_tty; 779 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 780 if (error != EPASSTHROUGH) 781 return (error); 782 783 error = ttioctl(tp, cmd, data, flag, l); 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 mutex_spin_enter(&cs->cs_lock); 796 797 switch (cmd) { 798 case TIOCSBRK: 799 zs_break(cs, 1); 800 break; 801 802 case TIOCCBRK: 803 zs_break(cs, 0); 804 break; 805 806 case TIOCGFLAGS: 807 *(int *)data = zst->zst_swflags; 808 break; 809 810 case TIOCSFLAGS: 811 error = kauth_authorize_device_tty(l->l_cred, 812 KAUTH_DEVICE_TTY_PRIVSET, tp); 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 case PPS_IOC_DESTROY: 838 case PPS_IOC_GETPARAMS: 839 case PPS_IOC_SETPARAMS: 840 case PPS_IOC_GETCAP: 841 case PPS_IOC_FETCH: 842#ifdef PPS_SYNC 843 case PPS_IOC_KCBIND: 844#endif 845 mutex_spin_enter(&timecounter_lock); 846 error = pps_ioctl(cmd, data, &zst->zst_pps_state); 847 if (zst->zst_pps_state.ppsparam.mode & PPS_CAPTUREBOTH) 848 zst->zst_ppsmask = ZSRR0_DCD; 849 else 850 zst->zst_ppsmask = 0; 851 mutex_spin_exit(&timecounter_lock); 852 break; 853 854 case TIOCDCDTIMESTAMP: /* XXX old, overloaded API used by xntpd v3 */ 855 if (cs->cs_rr0_pps == 0) { 856 error = EINVAL; 857 break; 858 } 859 mutex_spin_enter(&timecounter_lock); 860#ifndef PPS_TRAILING_EDGE 861 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 862 &zst->zst_pps_state.ppsinfo.assert_timestamp); 863#else 864 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 865 &zst->zst_pps_state.ppsinfo.clear_timestamp); 866#endif 867 mutex_spin_exit(&timecounter_lock); 868 /* 869 * Now update interrupts. 870 */ 871 zs_maskintr(zst); 872 /* 873 * If nothing is being transmitted, set up new current values, 874 * else mark them as pending. 875 */ 876 if (!cs->cs_heldchange) { 877 if (zst->zst_tx_busy) { 878 zst->zst_heldtbc = zst->zst_tbc; 879 zst->zst_tbc = 0; 880 cs->cs_heldchange = 1; 881 } else 882 zs_loadchannelregs(cs); 883 } 884 885 break; 886 887 default: 888 error = EPASSTHROUGH; 889 break; 890 } 891 892 mutex_spin_exit(&cs->cs_lock); 893 894 return (error); 895} 896 897/* 898 * Start or restart transmission. 899 */ 900static void 901zsstart(struct tty *tp) 902{ 903 struct zstty_softc *zst; 904 struct zs_chanstate *cs; 905 u_char *tba; 906 int tbc; 907 908 zst = device_lookup_private(&zstty_cd, ZSUNIT(tp->t_dev)); 909 cs = zst->zst_cs; 910 911 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 912 return; 913 if (zst->zst_tx_stopped) 914 return; 915 if (!ttypull(tp)) 916 return; 917 918 /* Grab the first contiguous region of buffer space. */ 919 tba = tp->t_outq.c_cf; 920 tbc = ndqb(&tp->t_outq, 0); 921 922 mutex_spin_enter(&cs->cs_lock); 923 924 zst->zst_tba = tba; 925 zst->zst_tbc = tbc; 926 SET(tp->t_state, TS_BUSY); 927 zst->zst_tx_busy = 1; 928 929#ifdef ZS_TXDMA 930 if (zst->zst_tbc > 1) { 931 zs_dma_setup(cs, zst->zst_tba, zst->zst_tbc); 932 mutex_spin_exit(&cs->cs_lock); 933 return; 934 } 935#endif 936 937 /* Output the first character of the contiguous buffer. */ 938 zs_write_data(cs, *zst->zst_tba); 939 zst->zst_tbc--; 940 zst->zst_tba++; 941 942 mutex_spin_exit(&cs->cs_lock); 943} 944 945/* 946 * Stop output, e.g., for ^S or output flush. 947 */ 948void 949zsstop(struct tty *tp, int flag) 950{ 951 struct zstty_softc *zst; 952 953 zst = device_lookup_private(&zstty_cd, ZSUNIT(tp->t_dev)); 954 955 mutex_spin_enter(&zst->zst_cs->cs_lock); 956 if (ISSET(tp->t_state, TS_BUSY)) { 957 /* Stop transmitting at the next chunk. */ 958 zst->zst_tbc = 0; 959 zst->zst_heldtbc = 0; 960 if (!ISSET(tp->t_state, TS_TTSTOP)) 961 SET(tp->t_state, TS_FLUSH); 962 } 963 mutex_spin_exit(&zst->zst_cs->cs_lock); 964} 965 966/* 967 * Set ZS tty parameters from termios. 968 * XXX - Should just copy the whole termios after 969 * making sure all the changes could be done. 970 */ 971static int 972zsparam(struct tty *tp, struct termios *t) 973{ 974 struct zstty_softc *zst; 975 struct zs_chanstate *cs; 976 int ospeed; 977 tcflag_t cflag; 978 uint8_t tmp3, tmp4, tmp5; 979 int error; 980 981 zst = device_lookup_private(&zstty_cd, ZSUNIT(tp->t_dev)); 982 cs = zst->zst_cs; 983 ospeed = t->c_ospeed; 984 cflag = t->c_cflag; 985 986 /* Check requested parameters. */ 987 if (ospeed < 0) 988 return (EINVAL); 989 if (t->c_ispeed && t->c_ispeed != ospeed) 990 return (EINVAL); 991 992 /* 993 * For the console, always force CLOCAL and !HUPCL, so that the port 994 * is always active. 995 */ 996 if (ISSET(zst->zst_swflags, TIOCFLAG_SOFTCAR) || 997 ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 998 SET(cflag, CLOCAL); 999 CLR(cflag, HUPCL); 1000 } 1001 1002 /* 1003 * Only whack the UART when params change. 1004 * Some callers need to clear tp->t_ospeed 1005 * to make sure initialization gets done. 1006 */ 1007 if (tp->t_ospeed == ospeed && 1008 tp->t_cflag == cflag) 1009 return (0); 1010 1011 /* 1012 * Call MD functions to deal with changed 1013 * clock modes or H/W flow control modes. 1014 * The BRG divisor is set now. (reg 12,13) 1015 */ 1016 error = zs_set_speed(cs, ospeed); 1017 if (error) 1018 return (error); 1019 error = zs_set_modes(cs, cflag); 1020 if (error) 1021 return (error); 1022 1023 /* 1024 * Block interrupts so that state will not 1025 * be altered until we are done setting it up. 1026 * 1027 * Initial values in cs_preg are set before 1028 * our attach routine is called. The master 1029 * interrupt enable is handled by zsc.c 1030 * 1031 */ 1032 mutex_spin_enter(&cs->cs_lock); 1033 1034 /* 1035 * Recalculate which status ints to enable. 1036 */ 1037 zs_maskintr(zst); 1038 1039 /* Recompute character size bits. */ 1040 tmp3 = cs->cs_preg[3]; 1041 tmp5 = cs->cs_preg[5]; 1042 CLR(tmp3, ZSWR3_RXSIZE); 1043 CLR(tmp5, ZSWR5_TXSIZE); 1044 switch (ISSET(cflag, CSIZE)) { 1045 case CS5: 1046 SET(tmp3, ZSWR3_RX_5); 1047 SET(tmp5, ZSWR5_TX_5); 1048 break; 1049 case CS6: 1050 SET(tmp3, ZSWR3_RX_6); 1051 SET(tmp5, ZSWR5_TX_6); 1052 break; 1053 case CS7: 1054 SET(tmp3, ZSWR3_RX_7); 1055 SET(tmp5, ZSWR5_TX_7); 1056 break; 1057 case CS8: 1058 SET(tmp3, ZSWR3_RX_8); 1059 SET(tmp5, ZSWR5_TX_8); 1060 break; 1061 } 1062 cs->cs_preg[3] = tmp3; 1063 cs->cs_preg[5] = tmp5; 1064 1065 /* 1066 * Recompute the stop bits and parity bits. Note that 1067 * zs_set_speed() may have set clock selection bits etc. 1068 * in wr4, so those must preserved. 1069 */ 1070 tmp4 = cs->cs_preg[4]; 1071 CLR(tmp4, ZSWR4_SBMASK | ZSWR4_PARMASK); 1072 if (ISSET(cflag, CSTOPB)) 1073 SET(tmp4, ZSWR4_TWOSB); 1074 else 1075 SET(tmp4, ZSWR4_ONESB); 1076 if (!ISSET(cflag, PARODD)) 1077 SET(tmp4, ZSWR4_EVENP); 1078 if (ISSET(cflag, PARENB)) 1079 SET(tmp4, ZSWR4_PARENB); 1080 cs->cs_preg[4] = tmp4; 1081 1082 /* And copy to tty. */ 1083 tp->t_ispeed = 0; 1084 tp->t_ospeed = ospeed; 1085 tp->t_cflag = cflag; 1086 1087 /* 1088 * If nothing is being transmitted, set up new current values, 1089 * else mark them as pending. 1090 */ 1091 if (!cs->cs_heldchange) { 1092 if (zst->zst_tx_busy) { 1093 zst->zst_heldtbc = zst->zst_tbc; 1094 zst->zst_tbc = 0; 1095 cs->cs_heldchange = 1; 1096 } else 1097 zs_loadchannelregs(cs); 1098 } 1099 1100 /* 1101 * If hardware flow control is disabled, turn off the buffer water 1102 * marks and unblock any soft flow control state. Otherwise, enable 1103 * the water marks. 1104 */ 1105 if (!ISSET(cflag, CHWFLOW)) { 1106 zst->zst_r_hiwat = 0; 1107 zst->zst_r_lowat = 0; 1108 if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1109 CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1110 zst->zst_rx_ready = 1; 1111 cs->cs_softreq = 1; 1112 } 1113 if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 1114 CLR(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 1115 zs_hwiflow(zst); 1116 } 1117 } else { 1118 zst->zst_r_hiwat = zstty_rbuf_hiwat; 1119 zst->zst_r_lowat = zstty_rbuf_lowat; 1120 } 1121 1122 /* 1123 * Force a recheck of the hardware carrier and flow control status, 1124 * since we may have changed which bits we're looking at. 1125 */ 1126 zstty_stint(cs, 1); 1127 1128 mutex_spin_exit(&cs->cs_lock); 1129 1130 /* 1131 * If hardware flow control is disabled, unblock any hard flow control 1132 * state. 1133 */ 1134 if (!ISSET(cflag, CHWFLOW)) { 1135 if (zst->zst_tx_stopped) { 1136 zst->zst_tx_stopped = 0; 1137 zsstart(tp); 1138 } 1139 } 1140 1141 zstty_softint1(cs); 1142 1143 return (0); 1144} 1145 1146/* 1147 * Compute interrupt enable bits and set in the pending bits. Called both 1148 * in zsparam() and when PPS (pulse per second timing) state changes. 1149 * Must be called at splzs(). 1150 */ 1151static void 1152zs_maskintr(struct zstty_softc *zst) 1153{ 1154 struct zs_chanstate *cs = zst->zst_cs; 1155 uint8_t tmp15; 1156 1157 cs->cs_rr0_mask = cs->cs_rr0_cts | cs->cs_rr0_dcd; 1158 if (zst->zst_ppsmask != 0) 1159 cs->cs_rr0_mask |= cs->cs_rr0_pps; 1160 tmp15 = cs->cs_preg[15]; 1161 if (ISSET(cs->cs_rr0_mask, ZSRR0_DCD)) 1162 SET(tmp15, ZSWR15_DCD_IE); 1163 else 1164 CLR(tmp15, ZSWR15_DCD_IE); 1165 if (ISSET(cs->cs_rr0_mask, ZSRR0_CTS)) 1166 SET(tmp15, ZSWR15_CTS_IE); 1167 else 1168 CLR(tmp15, ZSWR15_CTS_IE); 1169 cs->cs_preg[15] = tmp15; 1170} 1171 1172 1173/* 1174 * Raise or lower modem control (DTR/RTS) signals. If a character is 1175 * in transmission, the change is deferred. 1176 * Called at splzs() and with the channel lock held. 1177 */ 1178static void 1179zs_modem(struct zstty_softc *zst, int onoff) 1180{ 1181 struct zs_chanstate *cs = zst->zst_cs, *ccs; 1182 1183 if (cs->cs_wr5_dtr == 0) 1184 return; 1185 1186 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs); 1187 1188 if (onoff) 1189 SET(ccs->cs_preg[5], cs->cs_wr5_dtr); 1190 else 1191 CLR(ccs->cs_preg[5], cs->cs_wr5_dtr); 1192 1193 if (!cs->cs_heldchange) { 1194 if (zst->zst_tx_busy) { 1195 zst->zst_heldtbc = zst->zst_tbc; 1196 zst->zst_tbc = 0; 1197 cs->cs_heldchange = 1; 1198 } else 1199 zs_loadchannelregs(cs); 1200 } 1201} 1202 1203/* 1204 * Set modem bits. 1205 * Called at splzs() and with the channel lock held. 1206 */ 1207static void 1208tiocm_to_zs(struct zstty_softc *zst, u_long how, int ttybits) 1209{ 1210 struct zs_chanstate *cs = zst->zst_cs, *ccs; 1211 uint8_t zsbits; 1212 1213 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs); 1214 1215 zsbits = 0; 1216 if (ISSET(ttybits, TIOCM_DTR)) 1217 SET(zsbits, ZSWR5_DTR); 1218 if (ISSET(ttybits, TIOCM_RTS)) 1219 SET(zsbits, ZSWR5_RTS); 1220 1221 switch (how) { 1222 case TIOCMBIC: 1223 CLR(ccs->cs_preg[5], zsbits); 1224 break; 1225 1226 case TIOCMBIS: 1227 SET(ccs->cs_preg[5], zsbits); 1228 break; 1229 1230 case TIOCMSET: 1231 CLR(ccs->cs_preg[5], ZSWR5_RTS | ZSWR5_DTR); 1232 SET(ccs->cs_preg[5], zsbits); 1233 break; 1234 } 1235 1236 if (!cs->cs_heldchange) { 1237 if (zst->zst_tx_busy) { 1238 zst->zst_heldtbc = zst->zst_tbc; 1239 zst->zst_tbc = 0; 1240 cs->cs_heldchange = 1; 1241 } else 1242 zs_loadchannelregs(cs); 1243 } 1244} 1245 1246/* 1247 * Get modem bits. 1248 * Called at splzs() and with the channel lock held. 1249 */ 1250static int 1251zs_to_tiocm(struct zstty_softc *zst) 1252{ 1253 struct zs_chanstate *cs = zst->zst_cs, *ccs; 1254 uint8_t zsbits; 1255 int ttybits = 0; 1256 1257 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs); 1258 1259 zsbits = ccs->cs_preg[5]; 1260 if (ISSET(zsbits, ZSWR5_DTR)) 1261 SET(ttybits, TIOCM_DTR); 1262 if (ISSET(zsbits, ZSWR5_RTS)) 1263 SET(ttybits, TIOCM_RTS); 1264 1265 zsbits = cs->cs_rr0; 1266 if (ISSET(zsbits, ZSRR0_DCD)) 1267 SET(ttybits, TIOCM_CD); 1268 if (ISSET(zsbits, ZSRR0_CTS)) 1269 SET(ttybits, TIOCM_CTS); 1270 1271 return (ttybits); 1272} 1273 1274/* 1275 * Try to block or unblock input using hardware flow-control. 1276 * This is called by kern/tty.c if MDMBUF|CRTSCTS is set, and 1277 * if this function returns non-zero, the TS_TBLOCK flag will 1278 * be set or cleared according to the "block" arg passed. 1279 */ 1280int 1281zshwiflow(struct tty *tp, int block) 1282{ 1283 struct zstty_softc *zst; 1284 struct zs_chanstate *cs; 1285 1286 zst = device_lookup_private(&zstty_cd, ZSUNIT(tp->t_dev)); 1287 cs = zst->zst_cs; 1288 1289 if (cs->cs_wr5_rts == 0) 1290 return (0); 1291 1292 mutex_spin_enter(&cs->cs_lock); 1293 if (block) { 1294 if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1295 SET(zst->zst_rx_flags, RX_TTY_BLOCKED); 1296 zs_hwiflow(zst); 1297 } 1298 } else { 1299 if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1300 CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1301 zst->zst_rx_ready = 1; 1302 cs->cs_softreq = 1; 1303 } 1304 if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1305 CLR(zst->zst_rx_flags, RX_TTY_BLOCKED); 1306 zs_hwiflow(zst); 1307 } 1308 } 1309 mutex_spin_exit(&cs->cs_lock); 1310 return (1); 1311} 1312 1313/* 1314 * Internal version of zshwiflow 1315 * Called at splzs() and with the channel lock held. 1316 */ 1317static void 1318zs_hwiflow(struct zstty_softc *zst) 1319{ 1320 struct zs_chanstate *cs = zst->zst_cs, *ccs; 1321 1322 if (cs->cs_wr5_rts == 0) 1323 return; 1324 1325 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs); 1326 1327 if (ISSET(zst->zst_rx_flags, RX_ANY_BLOCK)) { 1328 CLR(ccs->cs_preg[5], cs->cs_wr5_rts); 1329 CLR(ccs->cs_creg[5], cs->cs_wr5_rts); 1330 } else { 1331 SET(ccs->cs_preg[5], cs->cs_wr5_rts); 1332 SET(ccs->cs_creg[5], cs->cs_wr5_rts); 1333 } 1334 zs_write_reg(ccs, 5, ccs->cs_creg[5]); 1335} 1336 1337 1338/**************************************************************** 1339 * Interface to the lower layer (zscc) 1340 ****************************************************************/ 1341 1342#define integrate static inline 1343integrate void zstty_rxsoft(struct zstty_softc *, struct tty *); 1344integrate void zstty_txsoft(struct zstty_softc *, struct tty *); 1345integrate void zstty_stsoft(struct zstty_softc *, struct tty *); 1346static void zstty_diag(void *); 1347 1348/* 1349 * Receiver Ready interrupt. 1350 * Called at splzs() and with the channel lock held. 1351 */ 1352static void 1353zstty_rxint(struct zs_chanstate *cs) 1354{ 1355 struct zstty_softc *zst = cs->cs_private; 1356 uint8_t *put, *end; 1357 u_int cc; 1358 uint8_t rr0, rr1, c; 1359 1360 end = zst->zst_ebuf; 1361 put = zst->zst_rbput; 1362 cc = zst->zst_rbavail; 1363 1364 while (cc > 0) { 1365 /* 1366 * First read the status, because reading the received char 1367 * destroys the status of this char. 1368 */ 1369 rr1 = zs_read_reg(cs, 1); 1370 c = zs_read_data(cs); 1371 1372 if (ISSET(rr1, ZSRR1_FE | ZSRR1_DO | ZSRR1_PE)) { 1373 /* Clear the receive error. */ 1374 zs_write_csr(cs, ZSWR0_RESET_ERRORS); 1375 } 1376 1377 cn_check_magic(zst->zst_tty->t_dev, c, zstty_cnm_state); 1378 put[0] = c; 1379 put[1] = rr1; 1380 put += 2; 1381 if (put >= end) 1382 put = zst->zst_rbuf; 1383 cc--; 1384 1385 rr0 = zs_read_csr(cs); 1386 if (!ISSET(rr0, ZSRR0_RX_READY)) 1387 break; 1388 } 1389 1390 /* 1391 * Current string of incoming characters ended because 1392 * no more data was available or we ran out of space. 1393 * Schedule a receive event if any data was received. 1394 * If we're out of space, turn off receive interrupts. 1395 */ 1396 zst->zst_rbput = put; 1397 zst->zst_rbavail = cc; 1398 if (!ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1399 zst->zst_rx_ready = 1; 1400 cs->cs_softreq = 1; 1401 } 1402 1403 /* 1404 * See if we are in danger of overflowing a buffer. If 1405 * so, use hardware flow control to ease the pressure. 1406 */ 1407 if (!ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED) && 1408 cc < zst->zst_r_hiwat) { 1409 SET(zst->zst_rx_flags, RX_IBUF_BLOCKED); 1410 zs_hwiflow(zst); 1411 } 1412 1413 /* 1414 * If we're out of space, disable receive interrupts 1415 * until the queue has drained a bit. 1416 */ 1417 if (!cc) { 1418 SET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED); 1419 CLR(cs->cs_preg[1], ZSWR1_RIE); 1420 cs->cs_creg[1] = cs->cs_preg[1]; 1421 zs_write_reg(cs, 1, cs->cs_creg[1]); 1422 } 1423 1424#if 0 1425 printf("%xH%04d\n", zst->zst_rx_flags, zst->zst_rbavail); 1426#endif 1427} 1428 1429/* 1430 * Transmitter Ready interrupt. 1431 * Called at splzs() and with the channel lock held. 1432 */ 1433static void 1434zstty_txint(struct zs_chanstate *cs) 1435{ 1436 struct zstty_softc *zst = cs->cs_private; 1437 1438 zs_write_csr(cs, ZSWR0_RESET_TXINT); 1439 1440 /* 1441 * If we've delayed a parameter change, do it now, and restart 1442 * output. 1443 */ 1444 if (cs->cs_heldchange) { 1445 zs_loadchannelregs(cs); 1446 cs->cs_heldchange = 0; 1447 zst->zst_tbc = zst->zst_heldtbc; 1448 zst->zst_heldtbc = 0; 1449 } 1450 1451 /* Output the next character in the buffer, if any. */ 1452 if (zst->zst_tbc > 0) { 1453 zs_write_data(cs, *zst->zst_tba); 1454 zst->zst_tbc--; 1455 zst->zst_tba++; 1456 } else { 1457 if (zst->zst_tx_busy) { 1458 zst->zst_tx_busy = 0; 1459 zst->zst_tx_done = 1; 1460 cs->cs_softreq = 1; 1461 } 1462 } 1463} 1464 1465/* 1466 * Status Change interrupt. 1467 * Called at splzs() and with the channel lock held. 1468 */ 1469static void 1470zstty_stint(struct zs_chanstate *cs, int force) 1471{ 1472 struct zstty_softc *zst = cs->cs_private; 1473 uint8_t rr0, delta; 1474 1475 rr0 = zs_read_csr(cs); 1476 zs_write_csr(cs, ZSWR0_RESET_STATUS); 1477 1478 /* 1479 * Check here for console break, so that we can abort 1480 * even when interrupts are locking up the machine. 1481 */ 1482 if (ISSET(rr0, ZSRR0_BREAK)) 1483 cn_check_magic(zst->zst_tty->t_dev, CNC_BREAK, zstty_cnm_state); 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 if (zst->zst_pps_state.ppsparam.mode & 1499 PPS_CAPTUREBOTH) { 1500 mutex_spin_enter(&timecounter_lock); 1501 pps_capture(&zst->zst_pps_state); 1502 pps_event(&zst->zst_pps_state, 1503 (ISSET(cs->cs_rr0, zst->zst_ppsmask)) 1504 ? PPS_CAPTUREASSERT 1505 : PPS_CAPTURECLEAR); 1506 mutex_spin_exit(&timecounter_lock); 1507 } 1508 } 1509 1510 /* 1511 * Stop output immediately if we lose the output 1512 * flow control signal or carrier detect. 1513 */ 1514 if (ISSET(~rr0, cs->cs_rr0_mask)) { 1515 zst->zst_tbc = 0; 1516 zst->zst_heldtbc = 0; 1517 } 1518 1519 zst->zst_st_check = 1; 1520 cs->cs_softreq = 1; 1521 } 1522} 1523 1524void 1525zstty_diag(void *arg) 1526{ 1527 struct zstty_softc *zst = arg; 1528 int overflows, floods; 1529 1530 mutex_spin_enter(&zst->zst_cs->cs_lock); 1531 overflows = zst->zst_overflows; 1532 zst->zst_overflows = 0; 1533 floods = zst->zst_floods; 1534 zst->zst_floods = 0; 1535 zst->zst_errors = 0; 1536 mutex_spin_exit(&zst->zst_cs->cs_lock); 1537 1538 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1539 device_xname(zst->zst_dev), 1540 overflows, overflows == 1 ? "" : "s", 1541 floods, floods == 1 ? "" : "s"); 1542} 1543 1544integrate void 1545zstty_rxsoft(struct zstty_softc *zst, struct tty *tp) 1546{ 1547 struct zs_chanstate *cs = zst->zst_cs; 1548 int (*rint)(int, struct tty *) = tp->t_linesw->l_rint; 1549 uint8_t *get, *end; 1550 u_int cc, scc; 1551 uint8_t rr1; 1552 int code; 1553 1554 end = zst->zst_ebuf; 1555 get = zst->zst_rbget; 1556 scc = cc = zstty_rbuf_size - zst->zst_rbavail; 1557 1558 if (cc == zstty_rbuf_size) { 1559 zst->zst_floods++; 1560 if (zst->zst_errors++ == 0) 1561 callout_reset(&zst->zst_diag_ch, 60 * hz, 1562 zstty_diag, zst); 1563 } 1564 1565 /* If not yet open, drop the entire buffer content here */ 1566 if (!ISSET(tp->t_state, TS_ISOPEN)) { 1567 get += cc << 1; 1568 if (get >= end) 1569 get -= zstty_rbuf_size << 1; 1570 cc = 0; 1571 } 1572 while (cc) { 1573 code = get[0]; 1574 rr1 = get[1]; 1575 if (ISSET(rr1, ZSRR1_DO | ZSRR1_FE | ZSRR1_PE)) { 1576 if (ISSET(rr1, ZSRR1_DO)) { 1577 zst->zst_overflows++; 1578 if (zst->zst_errors++ == 0) 1579 callout_reset(&zst->zst_diag_ch, 1580 60 * hz, zstty_diag, zst); 1581 } 1582 if (ISSET(rr1, ZSRR1_FE)) 1583 SET(code, TTY_FE); 1584 if (ISSET(rr1, ZSRR1_PE)) 1585 SET(code, TTY_PE); 1586 } 1587 if ((*rint)(code, tp) == -1) { 1588 /* 1589 * The line discipline's buffer is out of space. 1590 */ 1591 if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1592 /* 1593 * We're either not using flow control, or the 1594 * line discipline didn't tell us to block for 1595 * some reason. Either way, we have no way to 1596 * know when there's more space available, so 1597 * just drop the rest of the data. 1598 */ 1599 get += cc << 1; 1600 if (get >= end) 1601 get -= zstty_rbuf_size << 1; 1602 cc = 0; 1603 } else { 1604 /* 1605 * Don't schedule any more receive processing 1606 * until the line discipline tells us there's 1607 * space available (through comhwiflow()). 1608 * Leave the rest of the data in the input 1609 * buffer. 1610 */ 1611 SET(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1612 } 1613 break; 1614 } 1615 get += 2; 1616 if (get >= end) 1617 get = zst->zst_rbuf; 1618 cc--; 1619 } 1620 1621 if (cc != scc) { 1622 zst->zst_rbget = get; 1623 mutex_spin_enter(&cs->cs_lock); 1624 cc = zst->zst_rbavail += scc - cc; 1625 /* Buffers should be ok again, release possible block. */ 1626 if (cc >= zst->zst_r_lowat) { 1627 if (ISSET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED)) { 1628 CLR(zst->zst_rx_flags, RX_IBUF_OVERFLOWED); 1629 SET(cs->cs_preg[1], ZSWR1_RIE); 1630 cs->cs_creg[1] = cs->cs_preg[1]; 1631 zs_write_reg(cs, 1, cs->cs_creg[1]); 1632 } 1633 if (ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED)) { 1634 CLR(zst->zst_rx_flags, RX_IBUF_BLOCKED); 1635 zs_hwiflow(zst); 1636 } 1637 } 1638 mutex_spin_exit(&cs->cs_lock); 1639 } 1640 1641#if 0 1642 printf("%xS%04d\n", zst->zst_rx_flags, zst->zst_rbavail); 1643#endif 1644} 1645 1646integrate void 1647zstty_txsoft(struct zstty_softc *zst, struct tty *tp) 1648{ 1649 struct zs_chanstate *cs = zst->zst_cs; 1650 1651 mutex_spin_enter(&cs->cs_lock); 1652 CLR(tp->t_state, TS_BUSY); 1653 if (ISSET(tp->t_state, TS_FLUSH)) 1654 CLR(tp->t_state, TS_FLUSH); 1655 else 1656 ndflush(&tp->t_outq, (int)(zst->zst_tba - tp->t_outq.c_cf)); 1657 mutex_spin_exit(&cs->cs_lock); 1658 (*tp->t_linesw->l_start)(tp); 1659} 1660 1661integrate void 1662zstty_stsoft(struct zstty_softc *zst, struct tty *tp) 1663{ 1664 struct zs_chanstate *cs = zst->zst_cs; 1665 uint8_t rr0, delta; 1666 1667 mutex_spin_enter(&cs->cs_lock); 1668 rr0 = cs->cs_rr0; 1669 delta = cs->cs_rr0_delta; 1670 cs->cs_rr0_delta = 0; 1671 mutex_spin_exit(&cs->cs_lock); 1672 1673 if (ISSET(delta, cs->cs_rr0_dcd)) { 1674 /* 1675 * Inform the tty layer that carrier detect changed. 1676 */ 1677 (void) (*tp->t_linesw->l_modem)(tp, ISSET(rr0, ZSRR0_DCD)); 1678 } 1679 1680 if (ISSET(delta, cs->cs_rr0_cts)) { 1681 /* Block or unblock output according to flow control. */ 1682 if (ISSET(rr0, cs->cs_rr0_cts)) { 1683 zst->zst_tx_stopped = 0; 1684 (*tp->t_linesw->l_start)(tp); 1685 } else { 1686 zst->zst_tx_stopped = 1; 1687 } 1688 } 1689} 1690 1691/* 1692 * Software interrupt. Called at zssoft 1693 * 1694 * The main job to be done here is to empty the input ring 1695 * by passing its contents up to the tty layer. The ring is 1696 * always emptied during this operation, therefore the ring 1697 * must not be larger than the space after "high water" in 1698 * the tty layer, or the tty layer might drop our input. 1699 * 1700 * Note: an "input blockage" condition is assumed to exist if 1701 * EITHER the TS_TBLOCK flag or zst_rx_blocked flag is set. 1702 */ 1703static void 1704zstty_softint(struct zs_chanstate *cs) 1705{ 1706 1707 zstty_softint1(cs); 1708} 1709 1710static void 1711zstty_softint1(struct zs_chanstate *cs) 1712{ 1713 struct zstty_softc *zst = cs->cs_private; 1714 struct tty *tp = zst->zst_tty; 1715 1716 1717 if (zst->zst_rx_ready) { 1718 zst->zst_rx_ready = 0; 1719 zstty_rxsoft(zst, tp); 1720 } 1721 1722 if (zst->zst_st_check) { 1723 zst->zst_st_check = 0; 1724 zstty_stsoft(zst, tp); 1725 } 1726 1727 if (zst->zst_tx_done) { 1728 zst->zst_tx_done = 0; 1729 zstty_txsoft(zst, tp); 1730 } 1731} 1732 1733struct zsops zsops_tty = { 1734 zstty_rxint, /* receive char available */ 1735 zstty_stint, /* external/status */ 1736 zstty_txint, /* xmit buffer empty */ 1737 zstty_softint, /* process software interrupt */ 1738}; 1739 1740#ifdef ZS_TXDMA 1741void 1742zstty_txdma_int(void *arg) 1743{ 1744 struct zs_chanstate *cs = arg; 1745 struct zstty_softc *zst = cs->cs_private; 1746 1747 zst->zst_tba += zst->zst_tbc; 1748 zst->zst_tbc = 0; 1749 1750 if (zst->zst_tx_busy) { 1751 zst->zst_tx_busy = 0; 1752 zst->zst_tx_done = 1; 1753 cs->cs_softreq = 1; 1754 } 1755} 1756#endif 1757