z8530tty.c revision 1.132
1/* $NetBSD: z8530tty.c,v 1.132 2017/10/31 10:45:19 martin 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 1.132 2017/10/31 10:45:19 martin 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 (void) zsparam(tp, &t); 633 634 /* 635 * Note: zsparam has done: cflag, ispeed, ospeed 636 * so we just need to do: iflag, oflag, lflag, cc 637 * For "raw" mode, just leave all zeros. 638 */ 639 if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_RAW)) { 640 tp->t_iflag = TTYDEF_IFLAG; 641 tp->t_oflag = TTYDEF_OFLAG; 642 tp->t_lflag = TTYDEF_LFLAG; 643 } else { 644 tp->t_iflag = 0; 645 tp->t_oflag = 0; 646 tp->t_lflag = 0; 647 } 648 ttychars(tp); 649 ttsetwater(tp); 650 651 mutex_spin_enter(&cs->cs_lock); 652 653 /* 654 * Turn on DTR. We must always do this, even if carrier is not 655 * present, because otherwise we'd have to use TIOCSDTR 656 * immediately after setting CLOCAL, which applications do not 657 * expect. We always assert DTR while the device is open 658 * unless explicitly requested to deassert it. 659 */ 660 zs_modem(zst, 1); 661 662 /* Clear the input ring, and unblock. */ 663 zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf; 664 zst->zst_rbavail = zstty_rbuf_size; 665 zs_iflush(cs); 666 CLR(zst->zst_rx_flags, RX_ANY_BLOCK); 667 zs_hwiflow(zst); 668 669 mutex_spin_exit(&cs->cs_lock); 670 } 671 672 mutex_spin_exit(&tty_lock); 673 674 error = ttyopen(tp, ZSDIALOUT(dev), ISSET(flags, O_NONBLOCK)); 675 if (error) 676 goto bad; 677 678 error = (*tp->t_linesw->l_open)(dev, tp); 679 if (error) 680 goto bad; 681 682 return (0); 683 684bad: 685 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 686 /* 687 * We failed to open the device, and nobody else had it opened. 688 * Clean up the state as appropriate. 689 */ 690 zs_shutdown(zst); 691 } 692 693 return (error); 694} 695 696/* 697 * Close a zs serial port. 698 */ 699int 700zsclose(dev_t dev, int flags, int mode, struct lwp *l) 701{ 702 struct zstty_softc *zst; 703 struct tty *tp; 704 705 zst = device_lookup_private(&zstty_cd, ZSUNIT(dev)); 706 tp = zst->zst_tty; 707 708 /* XXX This is for cons.c. */ 709 if (!ISSET(tp->t_state, TS_ISOPEN)) 710 return 0; 711 712 (*tp->t_linesw->l_close)(tp, flags); 713 ttyclose(tp); 714 715 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 716 /* 717 * Although we got a last close, the device may still be in 718 * use; e.g. if this was the dialout node, and there are still 719 * processes waiting for carrier on the non-dialout node. 720 */ 721 zs_shutdown(zst); 722 } 723 724 return (0); 725} 726 727/* 728 * Read/write zs serial port. 729 */ 730int 731zsread(dev_t dev, struct uio *uio, int flags) 732{ 733 struct zstty_softc *zst; 734 struct tty *tp; 735 736 zst = device_lookup_private(&zstty_cd, ZSUNIT(dev)); 737 tp = zst->zst_tty; 738 739 return ((*tp->t_linesw->l_read)(tp, uio, flags)); 740} 741 742int 743zswrite(dev_t dev, struct uio *uio, int flags) 744{ 745 struct zstty_softc *zst; 746 struct tty *tp; 747 748 zst = device_lookup_private(&zstty_cd, ZSUNIT(dev)); 749 tp = zst->zst_tty; 750 751 return ((*tp->t_linesw->l_write)(tp, uio, flags)); 752} 753 754int 755zspoll(dev_t dev, int events, struct lwp *l) 756{ 757 struct zstty_softc *zst; 758 struct tty *tp; 759 760 zst = device_lookup_private(&zstty_cd, ZSUNIT(dev)); 761 tp = zst->zst_tty; 762 763 return ((*tp->t_linesw->l_poll)(tp, events, l)); 764} 765 766int 767zsioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 768{ 769 struct zstty_softc *zst; 770 struct zs_chanstate *cs; 771 struct tty *tp; 772 int error; 773 774 zst = device_lookup_private(&zstty_cd, ZSUNIT(dev)); 775 cs = zst->zst_cs; 776 tp = zst->zst_tty; 777 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 778 if (error != EPASSTHROUGH) 779 return (error); 780 781 error = ttioctl(tp, cmd, data, flag, l); 782 if (error != EPASSTHROUGH) 783 return (error); 784 785#ifdef ZS_MD_IOCTL 786 error = ZS_MD_IOCTL(cs, cmd, data); 787 if (error != EPASSTHROUGH) 788 return (error); 789#endif /* ZS_MD_IOCTL */ 790 791 error = 0; 792 793 mutex_spin_enter(&cs->cs_lock); 794 795 switch (cmd) { 796 case TIOCSBRK: 797 zs_break(cs, 1); 798 break; 799 800 case TIOCCBRK: 801 zs_break(cs, 0); 802 break; 803 804 case TIOCGFLAGS: 805 *(int *)data = zst->zst_swflags; 806 break; 807 808 case TIOCSFLAGS: 809 error = kauth_authorize_device_tty(l->l_cred, 810 KAUTH_DEVICE_TTY_PRIVSET, tp); 811 if (error) 812 break; 813 zst->zst_swflags = *(int *)data; 814 break; 815 816 case TIOCSDTR: 817 zs_modem(zst, 1); 818 break; 819 820 case TIOCCDTR: 821 zs_modem(zst, 0); 822 break; 823 824 case TIOCMSET: 825 case TIOCMBIS: 826 case TIOCMBIC: 827 tiocm_to_zs(zst, cmd, *(int *)data); 828 break; 829 830 case TIOCMGET: 831 *(int *)data = zs_to_tiocm(zst); 832 break; 833 834 case PPS_IOC_CREATE: 835 case PPS_IOC_DESTROY: 836 case PPS_IOC_GETPARAMS: 837 case PPS_IOC_SETPARAMS: 838 case PPS_IOC_GETCAP: 839 case PPS_IOC_FETCH: 840#ifdef PPS_SYNC 841 case PPS_IOC_KCBIND: 842#endif 843 mutex_spin_enter(&timecounter_lock); 844 error = pps_ioctl(cmd, data, &zst->zst_pps_state); 845 if (zst->zst_pps_state.ppsparam.mode & PPS_CAPTUREBOTH) 846 zst->zst_ppsmask = ZSRR0_DCD; 847 else 848 zst->zst_ppsmask = 0; 849 mutex_spin_exit(&timecounter_lock); 850 break; 851 852 case TIOCDCDTIMESTAMP: /* XXX old, overloaded API used by xntpd v3 */ 853 if (cs->cs_rr0_pps == 0) { 854 error = EINVAL; 855 break; 856 } 857 mutex_spin_enter(&timecounter_lock); 858#ifndef PPS_TRAILING_EDGE 859 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 860 &zst->zst_pps_state.ppsinfo.assert_timestamp); 861#else 862 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 863 &zst->zst_pps_state.ppsinfo.clear_timestamp); 864#endif 865 mutex_spin_exit(&timecounter_lock); 866 /* 867 * Now update interrupts. 868 */ 869 zs_maskintr(zst); 870 /* 871 * If nothing is being transmitted, set up new current values, 872 * else mark them as pending. 873 */ 874 if (!cs->cs_heldchange) { 875 if (zst->zst_tx_busy) { 876 zst->zst_heldtbc = zst->zst_tbc; 877 zst->zst_tbc = 0; 878 cs->cs_heldchange = 1; 879 } else 880 zs_loadchannelregs(cs); 881 } 882 883 break; 884 885 default: 886 error = EPASSTHROUGH; 887 break; 888 } 889 890 mutex_spin_exit(&cs->cs_lock); 891 892 return (error); 893} 894 895/* 896 * Start or restart transmission. 897 */ 898static void 899zsstart(struct tty *tp) 900{ 901 struct zstty_softc *zst; 902 struct zs_chanstate *cs; 903 u_char *tba; 904 int tbc; 905 906 zst = device_lookup_private(&zstty_cd, ZSUNIT(tp->t_dev)); 907 cs = zst->zst_cs; 908 909 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 910 return; 911 if (zst->zst_tx_stopped) 912 return; 913 if (!ttypull(tp)) 914 return; 915 916 /* Grab the first contiguous region of buffer space. */ 917 tba = tp->t_outq.c_cf; 918 tbc = ndqb(&tp->t_outq, 0); 919 920 mutex_spin_enter(&cs->cs_lock); 921 922 zst->zst_tba = tba; 923 zst->zst_tbc = tbc; 924 SET(tp->t_state, TS_BUSY); 925 zst->zst_tx_busy = 1; 926 927#ifdef ZS_TXDMA 928 if (zst->zst_tbc > 1) { 929 zs_dma_setup(cs, zst->zst_tba, zst->zst_tbc); 930 mutex_spin_exit(&cs->cs_lock); 931 return; 932 } 933#endif 934 935 /* Output the first character of the contiguous buffer. */ 936 zs_write_data(cs, *zst->zst_tba); 937 zst->zst_tbc--; 938 zst->zst_tba++; 939 940 mutex_spin_exit(&cs->cs_lock); 941} 942 943/* 944 * Stop output, e.g., for ^S or output flush. 945 */ 946void 947zsstop(struct tty *tp, int flag) 948{ 949 struct zstty_softc *zst; 950 951 zst = device_lookup_private(&zstty_cd, ZSUNIT(tp->t_dev)); 952 953 mutex_spin_enter(&zst->zst_cs->cs_lock); 954 if (ISSET(tp->t_state, TS_BUSY)) { 955 /* Stop transmitting at the next chunk. */ 956 zst->zst_tbc = 0; 957 zst->zst_heldtbc = 0; 958 if (!ISSET(tp->t_state, TS_TTSTOP)) 959 SET(tp->t_state, TS_FLUSH); 960 } 961 mutex_spin_exit(&zst->zst_cs->cs_lock); 962} 963 964/* 965 * Set ZS tty parameters from termios. 966 * XXX - Should just copy the whole termios after 967 * making sure all the changes could be done. 968 */ 969static int 970zsparam(struct tty *tp, struct termios *t) 971{ 972 struct zstty_softc *zst; 973 struct zs_chanstate *cs; 974 int ospeed; 975 tcflag_t cflag; 976 uint8_t tmp3, tmp4, tmp5; 977 int error; 978 979 zst = device_lookup_private(&zstty_cd, ZSUNIT(tp->t_dev)); 980 cs = zst->zst_cs; 981 ospeed = t->c_ospeed; 982 cflag = t->c_cflag; 983 984 /* Check requested parameters. */ 985 if (ospeed < 0) 986 return (EINVAL); 987 if (t->c_ispeed && t->c_ispeed != ospeed) 988 return (EINVAL); 989 990 /* 991 * For the console, always force CLOCAL and !HUPCL, so that the port 992 * is always active. 993 */ 994 if (ISSET(zst->zst_swflags, TIOCFLAG_SOFTCAR) || 995 ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 996 SET(cflag, CLOCAL); 997 CLR(cflag, HUPCL); 998 } 999 1000 /* 1001 * Only whack the UART when params change. 1002 * Some callers need to clear tp->t_ospeed 1003 * to make sure initialization gets done. 1004 */ 1005 if (tp->t_ospeed == ospeed && 1006 tp->t_cflag == cflag) 1007 return (0); 1008 1009 /* 1010 * Call MD functions to deal with changed 1011 * clock modes or H/W flow control modes. 1012 * The BRG divisor is set now. (reg 12,13) 1013 */ 1014 error = zs_set_speed(cs, ospeed); 1015 if (error) 1016 return (error); 1017 error = zs_set_modes(cs, cflag); 1018 if (error) 1019 return (error); 1020 1021 /* 1022 * Block interrupts so that state will not 1023 * be altered until we are done setting it up. 1024 * 1025 * Initial values in cs_preg are set before 1026 * our attach routine is called. The master 1027 * interrupt enable is handled by zsc.c 1028 * 1029 */ 1030 mutex_spin_enter(&cs->cs_lock); 1031 1032 /* 1033 * Recalculate which status ints to enable. 1034 */ 1035 zs_maskintr(zst); 1036 1037 /* Recompute character size bits. */ 1038 tmp3 = cs->cs_preg[3]; 1039 tmp5 = cs->cs_preg[5]; 1040 CLR(tmp3, ZSWR3_RXSIZE); 1041 CLR(tmp5, ZSWR5_TXSIZE); 1042 switch (ISSET(cflag, CSIZE)) { 1043 case CS5: 1044 SET(tmp3, ZSWR3_RX_5); 1045 SET(tmp5, ZSWR5_TX_5); 1046 break; 1047 case CS6: 1048 SET(tmp3, ZSWR3_RX_6); 1049 SET(tmp5, ZSWR5_TX_6); 1050 break; 1051 case CS7: 1052 SET(tmp3, ZSWR3_RX_7); 1053 SET(tmp5, ZSWR5_TX_7); 1054 break; 1055 case CS8: 1056 SET(tmp3, ZSWR3_RX_8); 1057 SET(tmp5, ZSWR5_TX_8); 1058 break; 1059 } 1060 cs->cs_preg[3] = tmp3; 1061 cs->cs_preg[5] = tmp5; 1062 1063 /* 1064 * Recompute the stop bits and parity bits. Note that 1065 * zs_set_speed() may have set clock selection bits etc. 1066 * in wr4, so those must preserved. 1067 */ 1068 tmp4 = cs->cs_preg[4]; 1069 CLR(tmp4, ZSWR4_SBMASK | ZSWR4_PARMASK); 1070 if (ISSET(cflag, CSTOPB)) 1071 SET(tmp4, ZSWR4_TWOSB); 1072 else 1073 SET(tmp4, ZSWR4_ONESB); 1074 if (!ISSET(cflag, PARODD)) 1075 SET(tmp4, ZSWR4_EVENP); 1076 if (ISSET(cflag, PARENB)) 1077 SET(tmp4, ZSWR4_PARENB); 1078 cs->cs_preg[4] = tmp4; 1079 1080 /* And copy to tty. */ 1081 tp->t_ispeed = 0; 1082 tp->t_ospeed = ospeed; 1083 tp->t_cflag = cflag; 1084 1085 /* 1086 * If nothing is being transmitted, set up new current values, 1087 * else mark them as pending. 1088 */ 1089 if (!cs->cs_heldchange) { 1090 if (zst->zst_tx_busy) { 1091 zst->zst_heldtbc = zst->zst_tbc; 1092 zst->zst_tbc = 0; 1093 cs->cs_heldchange = 1; 1094 } else 1095 zs_loadchannelregs(cs); 1096 } 1097 1098 /* 1099 * If hardware flow control is disabled, turn off the buffer water 1100 * marks and unblock any soft flow control state. Otherwise, enable 1101 * the water marks. 1102 */ 1103 if (!ISSET(cflag, CHWFLOW)) { 1104 zst->zst_r_hiwat = 0; 1105 zst->zst_r_lowat = 0; 1106 if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1107 CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1108 zst->zst_rx_ready = 1; 1109 cs->cs_softreq = 1; 1110 } 1111 if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 1112 CLR(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 1113 zs_hwiflow(zst); 1114 } 1115 } else { 1116 zst->zst_r_hiwat = zstty_rbuf_hiwat; 1117 zst->zst_r_lowat = zstty_rbuf_lowat; 1118 } 1119 1120 /* 1121 * Force a recheck of the hardware carrier and flow control status, 1122 * since we may have changed which bits we're looking at. 1123 */ 1124 zstty_stint(cs, 1); 1125 1126 mutex_spin_exit(&cs->cs_lock); 1127 1128 /* 1129 * If hardware flow control is disabled, unblock any hard flow control 1130 * state. 1131 */ 1132 if (!ISSET(cflag, CHWFLOW)) { 1133 if (zst->zst_tx_stopped) { 1134 zst->zst_tx_stopped = 0; 1135 zsstart(tp); 1136 } 1137 } 1138 1139 zstty_softint1(cs); 1140 1141 return (0); 1142} 1143 1144/* 1145 * Compute interrupt enable bits and set in the pending bits. Called both 1146 * in zsparam() and when PPS (pulse per second timing) state changes. 1147 * Must be called at splzs(). 1148 */ 1149static void 1150zs_maskintr(struct zstty_softc *zst) 1151{ 1152 struct zs_chanstate *cs = zst->zst_cs; 1153 uint8_t tmp15; 1154 1155 cs->cs_rr0_mask = cs->cs_rr0_cts | cs->cs_rr0_dcd; 1156 if (zst->zst_ppsmask != 0) 1157 cs->cs_rr0_mask |= cs->cs_rr0_pps; 1158 tmp15 = cs->cs_preg[15]; 1159 if (ISSET(cs->cs_rr0_mask, ZSRR0_DCD)) 1160 SET(tmp15, ZSWR15_DCD_IE); 1161 else 1162 CLR(tmp15, ZSWR15_DCD_IE); 1163 if (ISSET(cs->cs_rr0_mask, ZSRR0_CTS)) 1164 SET(tmp15, ZSWR15_CTS_IE); 1165 else 1166 CLR(tmp15, ZSWR15_CTS_IE); 1167 cs->cs_preg[15] = tmp15; 1168} 1169 1170 1171/* 1172 * Raise or lower modem control (DTR/RTS) signals. If a character is 1173 * in transmission, the change is deferred. 1174 * Called at splzs() and with the channel lock held. 1175 */ 1176static void 1177zs_modem(struct zstty_softc *zst, int onoff) 1178{ 1179 struct zs_chanstate *cs = zst->zst_cs, *ccs; 1180 1181 if (cs->cs_wr5_dtr == 0) 1182 return; 1183 1184 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs); 1185 1186 if (onoff) 1187 SET(ccs->cs_preg[5], cs->cs_wr5_dtr); 1188 else 1189 CLR(ccs->cs_preg[5], cs->cs_wr5_dtr); 1190 1191 if (!cs->cs_heldchange) { 1192 if (zst->zst_tx_busy) { 1193 zst->zst_heldtbc = zst->zst_tbc; 1194 zst->zst_tbc = 0; 1195 cs->cs_heldchange = 1; 1196 } else 1197 zs_loadchannelregs(cs); 1198 } 1199} 1200 1201/* 1202 * Set modem bits. 1203 * Called at splzs() and with the channel lock held. 1204 */ 1205static void 1206tiocm_to_zs(struct zstty_softc *zst, u_long how, int ttybits) 1207{ 1208 struct zs_chanstate *cs = zst->zst_cs, *ccs; 1209 uint8_t zsbits; 1210 1211 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs); 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(ccs->cs_preg[5], zsbits); 1222 break; 1223 1224 case TIOCMBIS: 1225 SET(ccs->cs_preg[5], zsbits); 1226 break; 1227 1228 case TIOCMSET: 1229 CLR(ccs->cs_preg[5], ZSWR5_RTS | ZSWR5_DTR); 1230 SET(ccs->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/* 1245 * Get modem bits. 1246 * Called at splzs() and with the channel lock held. 1247 */ 1248static int 1249zs_to_tiocm(struct zstty_softc *zst) 1250{ 1251 struct zs_chanstate *cs = zst->zst_cs, *ccs; 1252 uint8_t zsbits; 1253 int ttybits = 0; 1254 1255 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs); 1256 1257 zsbits = ccs->cs_preg[5]; 1258 if (ISSET(zsbits, ZSWR5_DTR)) 1259 SET(ttybits, TIOCM_DTR); 1260 if (ISSET(zsbits, ZSWR5_RTS)) 1261 SET(ttybits, TIOCM_RTS); 1262 1263 zsbits = cs->cs_rr0; 1264 if (ISSET(zsbits, ZSRR0_DCD)) 1265 SET(ttybits, TIOCM_CD); 1266 if (ISSET(zsbits, ZSRR0_CTS)) 1267 SET(ttybits, TIOCM_CTS); 1268 1269 return (ttybits); 1270} 1271 1272/* 1273 * Try to block or unblock input using hardware flow-control. 1274 * This is called by kern/tty.c if MDMBUF|CRTSCTS is set, and 1275 * if this function returns non-zero, the TS_TBLOCK flag will 1276 * be set or cleared according to the "block" arg passed. 1277 */ 1278int 1279zshwiflow(struct tty *tp, int block) 1280{ 1281 struct zstty_softc *zst; 1282 struct zs_chanstate *cs; 1283 1284 zst = device_lookup_private(&zstty_cd, ZSUNIT(tp->t_dev)); 1285 cs = zst->zst_cs; 1286 1287 if (cs->cs_wr5_rts == 0) 1288 return (0); 1289 1290 mutex_spin_enter(&cs->cs_lock); 1291 if (block) { 1292 if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1293 SET(zst->zst_rx_flags, RX_TTY_BLOCKED); 1294 zs_hwiflow(zst); 1295 } 1296 } else { 1297 if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1298 CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1299 zst->zst_rx_ready = 1; 1300 cs->cs_softreq = 1; 1301 } 1302 if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1303 CLR(zst->zst_rx_flags, RX_TTY_BLOCKED); 1304 zs_hwiflow(zst); 1305 } 1306 } 1307 mutex_spin_exit(&cs->cs_lock); 1308 return (1); 1309} 1310 1311/* 1312 * Internal version of zshwiflow 1313 * Called at splzs() and with the channel lock held. 1314 */ 1315static void 1316zs_hwiflow(struct zstty_softc *zst) 1317{ 1318 struct zs_chanstate *cs = zst->zst_cs, *ccs; 1319 1320 if (cs->cs_wr5_rts == 0) 1321 return; 1322 1323 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs); 1324 1325 if (ISSET(zst->zst_rx_flags, RX_ANY_BLOCK)) { 1326 CLR(ccs->cs_preg[5], cs->cs_wr5_rts); 1327 CLR(ccs->cs_creg[5], cs->cs_wr5_rts); 1328 } else { 1329 SET(ccs->cs_preg[5], cs->cs_wr5_rts); 1330 SET(ccs->cs_creg[5], cs->cs_wr5_rts); 1331 } 1332 zs_write_reg(ccs, 5, ccs->cs_creg[5]); 1333} 1334 1335 1336/**************************************************************** 1337 * Interface to the lower layer (zscc) 1338 ****************************************************************/ 1339 1340#define integrate static inline 1341integrate void zstty_rxsoft(struct zstty_softc *, struct tty *); 1342integrate void zstty_txsoft(struct zstty_softc *, struct tty *); 1343integrate void zstty_stsoft(struct zstty_softc *, struct tty *); 1344static void zstty_diag(void *); 1345 1346/* 1347 * Receiver Ready interrupt. 1348 * Called at splzs() and with the channel lock held. 1349 */ 1350static void 1351zstty_rxint(struct zs_chanstate *cs) 1352{ 1353 struct zstty_softc *zst = cs->cs_private; 1354 uint8_t *put, *end; 1355 u_int cc; 1356 uint8_t rr0, rr1, c; 1357 1358 end = zst->zst_ebuf; 1359 put = zst->zst_rbput; 1360 cc = zst->zst_rbavail; 1361 1362 while (cc > 0) { 1363 /* 1364 * First read the status, because reading the received char 1365 * destroys the status of this char. 1366 */ 1367 rr1 = zs_read_reg(cs, 1); 1368 c = zs_read_data(cs); 1369 1370 if (ISSET(rr1, ZSRR1_FE | ZSRR1_DO | ZSRR1_PE)) { 1371 /* Clear the receive error. */ 1372 zs_write_csr(cs, ZSWR0_RESET_ERRORS); 1373 } 1374 1375 cn_check_magic(zst->zst_tty->t_dev, c, zstty_cnm_state); 1376 put[0] = c; 1377 put[1] = rr1; 1378 put += 2; 1379 if (put >= end) 1380 put = zst->zst_rbuf; 1381 cc--; 1382 1383 rr0 = zs_read_csr(cs); 1384 if (!ISSET(rr0, ZSRR0_RX_READY)) 1385 break; 1386 } 1387 1388 /* 1389 * Current string of incoming characters ended because 1390 * no more data was available or we ran out of space. 1391 * Schedule a receive event if any data was received. 1392 * If we're out of space, turn off receive interrupts. 1393 */ 1394 zst->zst_rbput = put; 1395 zst->zst_rbavail = cc; 1396 if (!ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1397 zst->zst_rx_ready = 1; 1398 cs->cs_softreq = 1; 1399 } 1400 1401 /* 1402 * See if we are in danger of overflowing a buffer. If 1403 * so, use hardware flow control to ease the pressure. 1404 */ 1405 if (!ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED) && 1406 cc < zst->zst_r_hiwat) { 1407 SET(zst->zst_rx_flags, RX_IBUF_BLOCKED); 1408 zs_hwiflow(zst); 1409 } 1410 1411 /* 1412 * If we're out of space, disable receive interrupts 1413 * until the queue has drained a bit. 1414 */ 1415 if (!cc) { 1416 SET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED); 1417 CLR(cs->cs_preg[1], ZSWR1_RIE); 1418 cs->cs_creg[1] = cs->cs_preg[1]; 1419 zs_write_reg(cs, 1, cs->cs_creg[1]); 1420 } 1421 1422#if 0 1423 printf("%xH%04d\n", zst->zst_rx_flags, zst->zst_rbavail); 1424#endif 1425} 1426 1427/* 1428 * Transmitter Ready interrupt. 1429 * Called at splzs() and with the channel lock held. 1430 */ 1431static void 1432zstty_txint(struct zs_chanstate *cs) 1433{ 1434 struct zstty_softc *zst = cs->cs_private; 1435 1436 zs_write_csr(cs, ZSWR0_RESET_TXINT); 1437 1438 /* 1439 * If we've delayed a parameter change, do it now, and restart 1440 * output. 1441 */ 1442 if (cs->cs_heldchange) { 1443 zs_loadchannelregs(cs); 1444 cs->cs_heldchange = 0; 1445 zst->zst_tbc = zst->zst_heldtbc; 1446 zst->zst_heldtbc = 0; 1447 } 1448 1449 /* Output the next character in the buffer, if any. */ 1450 if (zst->zst_tbc > 0) { 1451 zs_write_data(cs, *zst->zst_tba); 1452 zst->zst_tbc--; 1453 zst->zst_tba++; 1454 } else { 1455 if (zst->zst_tx_busy) { 1456 zst->zst_tx_busy = 0; 1457 zst->zst_tx_done = 1; 1458 cs->cs_softreq = 1; 1459 } 1460 } 1461} 1462 1463/* 1464 * Status Change interrupt. 1465 * Called at splzs() and with the channel lock held. 1466 */ 1467static void 1468zstty_stint(struct zs_chanstate *cs, int force) 1469{ 1470 struct zstty_softc *zst = cs->cs_private; 1471 uint8_t rr0, delta; 1472 1473 rr0 = zs_read_csr(cs); 1474 zs_write_csr(cs, ZSWR0_RESET_STATUS); 1475 1476 /* 1477 * Check here for console break, so that we can abort 1478 * even when interrupts are locking up the machine. 1479 */ 1480 if (ISSET(rr0, ZSRR0_BREAK)) 1481 cn_check_magic(zst->zst_tty->t_dev, CNC_BREAK, zstty_cnm_state); 1482 1483 if (!force) 1484 delta = rr0 ^ cs->cs_rr0; 1485 else 1486 delta = cs->cs_rr0_mask; 1487 cs->cs_rr0 = rr0; 1488 1489 if (ISSET(delta, cs->cs_rr0_mask)) { 1490 SET(cs->cs_rr0_delta, delta); 1491 1492 /* 1493 * Pulse-per-second clock signal on edge of DCD? 1494 */ 1495 if (ISSET(delta, zst->zst_ppsmask)) { 1496 if (zst->zst_pps_state.ppsparam.mode & 1497 PPS_CAPTUREBOTH) { 1498 mutex_spin_enter(&timecounter_lock); 1499 pps_capture(&zst->zst_pps_state); 1500 pps_event(&zst->zst_pps_state, 1501 (ISSET(cs->cs_rr0, zst->zst_ppsmask)) 1502 ? PPS_CAPTUREASSERT 1503 : PPS_CAPTURECLEAR); 1504 mutex_spin_exit(&timecounter_lock); 1505 } 1506 } 1507 1508 /* 1509 * Stop output immediately if we lose the output 1510 * flow control signal or carrier detect. 1511 */ 1512 if (ISSET(~rr0, cs->cs_rr0_mask)) { 1513 zst->zst_tbc = 0; 1514 zst->zst_heldtbc = 0; 1515 } 1516 1517 zst->zst_st_check = 1; 1518 cs->cs_softreq = 1; 1519 } 1520} 1521 1522void 1523zstty_diag(void *arg) 1524{ 1525 struct zstty_softc *zst = arg; 1526 int overflows, floods; 1527 1528 mutex_spin_enter(&zst->zst_cs->cs_lock); 1529 overflows = zst->zst_overflows; 1530 zst->zst_overflows = 0; 1531 floods = zst->zst_floods; 1532 zst->zst_floods = 0; 1533 zst->zst_errors = 0; 1534 mutex_spin_exit(&zst->zst_cs->cs_lock); 1535 1536 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1537 device_xname(zst->zst_dev), 1538 overflows, overflows == 1 ? "" : "s", 1539 floods, floods == 1 ? "" : "s"); 1540} 1541 1542integrate void 1543zstty_rxsoft(struct zstty_softc *zst, struct tty *tp) 1544{ 1545 struct zs_chanstate *cs = zst->zst_cs; 1546 int (*rint)(int, struct tty *) = tp->t_linesw->l_rint; 1547 uint8_t *get, *end; 1548 u_int cc, scc; 1549 uint8_t rr1; 1550 int code; 1551 1552 end = zst->zst_ebuf; 1553 get = zst->zst_rbget; 1554 scc = cc = zstty_rbuf_size - zst->zst_rbavail; 1555 1556 if (cc == zstty_rbuf_size) { 1557 zst->zst_floods++; 1558 if (zst->zst_errors++ == 0) 1559 callout_reset(&zst->zst_diag_ch, 60 * hz, 1560 zstty_diag, zst); 1561 } 1562 1563 /* If not yet open, drop the entire buffer content here */ 1564 if (!ISSET(tp->t_state, TS_ISOPEN)) { 1565 get += cc << 1; 1566 if (get >= end) 1567 get -= zstty_rbuf_size << 1; 1568 cc = 0; 1569 } 1570 while (cc) { 1571 code = get[0]; 1572 rr1 = get[1]; 1573 if (ISSET(rr1, ZSRR1_DO | ZSRR1_FE | ZSRR1_PE)) { 1574 if (ISSET(rr1, ZSRR1_DO)) { 1575 zst->zst_overflows++; 1576 if (zst->zst_errors++ == 0) 1577 callout_reset(&zst->zst_diag_ch, 1578 60 * hz, zstty_diag, zst); 1579 } 1580 if (ISSET(rr1, ZSRR1_FE)) 1581 SET(code, TTY_FE); 1582 if (ISSET(rr1, ZSRR1_PE)) 1583 SET(code, TTY_PE); 1584 } 1585 if ((*rint)(code, tp) == -1) { 1586 /* 1587 * The line discipline's buffer is out of space. 1588 */ 1589 if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1590 /* 1591 * We're either not using flow control, or the 1592 * line discipline didn't tell us to block for 1593 * some reason. Either way, we have no way to 1594 * know when there's more space available, so 1595 * just drop the rest of the data. 1596 */ 1597 get += cc << 1; 1598 if (get >= end) 1599 get -= zstty_rbuf_size << 1; 1600 cc = 0; 1601 } else { 1602 /* 1603 * Don't schedule any more receive processing 1604 * until the line discipline tells us there's 1605 * space available (through comhwiflow()). 1606 * Leave the rest of the data in the input 1607 * buffer. 1608 */ 1609 SET(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1610 } 1611 break; 1612 } 1613 get += 2; 1614 if (get >= end) 1615 get = zst->zst_rbuf; 1616 cc--; 1617 } 1618 1619 if (cc != scc) { 1620 zst->zst_rbget = get; 1621 mutex_spin_enter(&cs->cs_lock); 1622 cc = zst->zst_rbavail += scc - cc; 1623 /* Buffers should be ok again, release possible block. */ 1624 if (cc >= zst->zst_r_lowat) { 1625 if (ISSET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED)) { 1626 CLR(zst->zst_rx_flags, RX_IBUF_OVERFLOWED); 1627 SET(cs->cs_preg[1], ZSWR1_RIE); 1628 cs->cs_creg[1] = cs->cs_preg[1]; 1629 zs_write_reg(cs, 1, cs->cs_creg[1]); 1630 } 1631 if (ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED)) { 1632 CLR(zst->zst_rx_flags, RX_IBUF_BLOCKED); 1633 zs_hwiflow(zst); 1634 } 1635 } 1636 mutex_spin_exit(&cs->cs_lock); 1637 } 1638 1639#if 0 1640 printf("%xS%04d\n", zst->zst_rx_flags, zst->zst_rbavail); 1641#endif 1642} 1643 1644integrate void 1645zstty_txsoft(struct zstty_softc *zst, struct tty *tp) 1646{ 1647 struct zs_chanstate *cs = zst->zst_cs; 1648 1649 mutex_spin_enter(&cs->cs_lock); 1650 CLR(tp->t_state, TS_BUSY); 1651 if (ISSET(tp->t_state, TS_FLUSH)) 1652 CLR(tp->t_state, TS_FLUSH); 1653 else 1654 ndflush(&tp->t_outq, (int)(zst->zst_tba - tp->t_outq.c_cf)); 1655 mutex_spin_exit(&cs->cs_lock); 1656 (*tp->t_linesw->l_start)(tp); 1657} 1658 1659integrate void 1660zstty_stsoft(struct zstty_softc *zst, struct tty *tp) 1661{ 1662 struct zs_chanstate *cs = zst->zst_cs; 1663 uint8_t rr0, delta; 1664 1665 mutex_spin_enter(&cs->cs_lock); 1666 rr0 = cs->cs_rr0; 1667 delta = cs->cs_rr0_delta; 1668 cs->cs_rr0_delta = 0; 1669 mutex_spin_exit(&cs->cs_lock); 1670 1671 if (ISSET(delta, cs->cs_rr0_dcd)) { 1672 /* 1673 * Inform the tty layer that carrier detect changed. 1674 */ 1675 mutex_spin_exit(&tty_lock); 1676 (void) (*tp->t_linesw->l_modem)(tp, ISSET(rr0, ZSRR0_DCD)); 1677 mutex_spin_enter(&tty_lock); 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