Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/dev/ic/z8530tty.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
1 /* $NetBSD: z8530tty.c,v 1.135 2022/10/26 23:45:25 riastradh 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 1.135 2022/10/26 23:45:25 riastradh 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 176 177 static 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 */ 182 u_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. */ 185 u_int zstty_rbuf_hiwat = (ZSTTY_RING_SIZE * 1) / 4; 186 u_int zstty_rbuf_lowat = (ZSTTY_RING_SIZE * 3) / 4; 187 188 struct 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. */ 239 static int zstty_match(device_t, cfdata_t, void *); 240 static void zstty_attach(device_t, device_t, void *); 241 242 CFATTACH_DECL_NEW(zstty, sizeof(struct zstty_softc), 243 zstty_match, zstty_attach, NULL, NULL); 244 245 dev_type_open(zsopen); 246 dev_type_close(zsclose); 247 dev_type_read(zsread); 248 dev_type_write(zswrite); 249 dev_type_ioctl(zsioctl); 250 dev_type_stop(zsstop); 251 dev_type_tty(zstty); 252 dev_type_poll(zspoll); 253 254 const 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 }; 268 269 struct zsops zsops_tty; 270 271 static void zs_shutdown(struct zstty_softc *); 272 static void zsstart(struct tty *); 273 static int zsparam(struct tty *, struct termios *); 274 static void zs_modem(struct zstty_softc *, int); 275 static void tiocm_to_zs(struct zstty_softc *, u_long, int); 276 static int zs_to_tiocm(struct zstty_softc *); 277 static int zshwiflow(struct tty *, int); 278 static void zs_hwiflow(struct zstty_softc *); 279 static void zs_maskintr(struct zstty_softc *); 280 281 /* Low-level routines. */ 282 static void zstty_rxint (struct zs_chanstate *); 283 static void zstty_stint (struct zs_chanstate *, int); 284 static void zstty_txint (struct zs_chanstate *); 285 static void zstty_softint(struct zs_chanstate *); 286 static void zstty_softint1(struct zs_chanstate *); 287 288 #define ZSUNIT(x) TTUNIT(x) 289 #define ZSDIALOUT(x) TTDIALOUT(x) 290 291 struct 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 */ 298 299 struct tty * 300 zstty_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 */ 310 int 311 zstty_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 } 325 326 void 327 zstty_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_WAITOK); 412 zst->zst_ebuf = zst->zst_rbuf + (zstty_rbuf_size << 1); 413 /* Disable the high water mark. */ 414 zst->zst_r_hiwat = 0; 415 zst->zst_r_lowat = 0; 416 zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf; 417 zst->zst_rbavail = zstty_rbuf_size; 418 419 /* if there are no enable/disable functions, assume the device 420 is always enabled */ 421 if (!cs->enable) 422 cs->enabled = 1; 423 424 /* 425 * Hardware init 426 */ 427 dtr_on = 0; 428 resetbit = 0; 429 if (ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 430 /* Call zsparam similar to open. */ 431 struct termios t; 432 433 /* Wait a while for previous console output to complete */ 434 DELAY(10000); 435 436 /* Setup the "new" parameters in t. */ 437 t.c_ispeed = 0; 438 t.c_ospeed = cs->cs_defspeed; 439 t.c_cflag = cs->cs_defcflag; 440 441 /* 442 * Turn on receiver and status interrupts. 443 * We defer the actual write of the register to zsparam(), 444 * but we must make sure status interrupts are turned on by 445 * the time zsparam() reads the initial rr0 state. 446 */ 447 SET(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_TIE | ZSWR1_SIE); 448 449 /* Make sure zsparam will see changes. */ 450 tp->t_ospeed = 0; 451 (void) zsparam(tp, &t); 452 453 /* Make sure DTR is on now. */ 454 dtr_on = 1; 455 456 } else if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_NORESET)) { 457 /* Not the console; may need reset. */ 458 resetbit = (channel == 0) ? ZSWR9_A_RESET : ZSWR9_B_RESET; 459 } 460 461 mutex_spin_enter(&cs->cs_lock); 462 if (resetbit) 463 zs_write_reg(cs, 9, resetbit); 464 zs_modem(zst, dtr_on); 465 mutex_spin_exit(&cs->cs_lock); 466 } 467 468 469 /* 470 * Return pointer to our tty. 471 */ 472 struct tty * 473 zstty(dev_t dev) 474 { 475 struct zstty_softc *zst; 476 477 zst = device_lookup_private(&zstty_cd, ZSUNIT(dev)); 478 479 return (zst->zst_tty); 480 } 481 482 483 void 484 zs_shutdown(struct zstty_softc *zst) 485 { 486 struct zs_chanstate *cs = zst->zst_cs; 487 struct tty *tp = zst->zst_tty; 488 489 mutex_spin_enter(&cs->cs_lock); 490 491 /* If we were asserting flow control, then deassert it. */ 492 SET(zst->zst_rx_flags, RX_IBUF_BLOCKED); 493 zs_hwiflow(zst); 494 495 /* Clear any break condition set with TIOCSBRK. */ 496 zs_break(cs, 0); 497 498 /* 499 * Hang up if necessary. Wait a bit, so the other side has time to 500 * notice even if we immediately open the port again. 501 */ 502 if (ISSET(tp->t_cflag, HUPCL)) { 503 zs_modem(zst, 0); 504 mutex_spin_exit(&cs->cs_lock); 505 /* 506 * XXX - another process is not prevented from opening 507 * the device during our sleep. 508 */ 509 (void) tsleep(cs, TTIPRI, ttclos, hz); 510 /* Re-check state in case we were opened during our sleep */ 511 if (ISSET(tp->t_state, TS_ISOPEN) || tp->t_wopen != 0) 512 return; 513 514 mutex_spin_enter(&cs->cs_lock); 515 } 516 517 /* Turn off interrupts if not the console. */ 518 if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 519 CLR(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_TIE | ZSWR1_SIE); 520 cs->cs_creg[1] = cs->cs_preg[1]; 521 zs_write_reg(cs, 1, cs->cs_creg[1]); 522 } 523 524 /* Call the power management hook. */ 525 if (cs->disable) { 526 #ifdef DIAGNOSTIC 527 if (!cs->enabled) 528 panic("%s: not enabled?", __func__); 529 #endif 530 (*cs->disable)(zst->zst_cs); 531 } 532 533 mutex_spin_exit(&cs->cs_lock); 534 } 535 536 /* 537 * Open a zs serial (tty) port. 538 */ 539 int 540 zsopen(dev_t dev, int flags, int mode, struct lwp *l) 541 { 542 struct zstty_softc *zst; 543 struct zs_chanstate *cs; 544 struct tty *tp; 545 int error; 546 547 zst = device_lookup_private(&zstty_cd, ZSUNIT(dev)); 548 if (zst == NULL) 549 return (ENXIO); 550 551 tp = zst->zst_tty; 552 cs = zst->zst_cs; 553 554 /* If KGDB took the line, then tp==NULL */ 555 if (tp == NULL) 556 return (EBUSY); 557 558 /* 559 * If the device is exclusively for kernel use, deny userland 560 * open. 561 */ 562 if (ISSET(tp->t_state, TS_KERN_ONLY)) 563 return (EBUSY); 564 565 if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp)) 566 return (EBUSY); 567 568 ttylock(tp); 569 570 /* 571 * Do the following iff this is a first open. 572 */ 573 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 574 struct termios t; 575 576 tp->t_dev = dev; 577 578 /* Call the power management hook. */ 579 if (cs->enable) { 580 if ((*cs->enable)(cs)) { 581 ttyunlock(tp); 582 printf("%s: device enable failed\n", 583 device_xname(zst->zst_dev)); 584 return (EIO); 585 } 586 } 587 588 /* 589 * Initialize the termios status to the defaults. Add in the 590 * sticky bits from TIOCSFLAGS. 591 */ 592 t.c_ispeed = 0; 593 t.c_ospeed = cs->cs_defspeed; 594 t.c_cflag = cs->cs_defcflag; 595 if (ISSET(zst->zst_swflags, TIOCFLAG_CLOCAL)) 596 SET(t.c_cflag, CLOCAL); 597 if (ISSET(zst->zst_swflags, TIOCFLAG_CRTSCTS)) 598 SET(t.c_cflag, CRTSCTS); 599 if (ISSET(zst->zst_swflags, TIOCFLAG_CDTRCTS)) 600 SET(t.c_cflag, CDTRCTS); 601 if (ISSET(zst->zst_swflags, TIOCFLAG_MDMBUF)) 602 SET(t.c_cflag, MDMBUF); 603 604 mutex_spin_enter(&cs->cs_lock); 605 606 /* 607 * Turn on receiver and status interrupts. 608 * We defer the actual write of the register to zsparam(), 609 * but we must make sure status interrupts are turned on by 610 * the time zsparam() reads the initial rr0 state. 611 */ 612 SET(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_TIE | ZSWR1_SIE); 613 614 /* Clear PPS capture state on first open. */ 615 mutex_spin_enter(&timecounter_lock); 616 zst->zst_ppsmask = 0; 617 memset(&zst->zst_pps_state, 0, sizeof(zst->zst_pps_state)); 618 zst->zst_pps_state.ppscap = 619 PPS_CAPTUREASSERT | PPS_CAPTURECLEAR; 620 pps_init(&zst->zst_pps_state); 621 mutex_spin_exit(&timecounter_lock); 622 623 mutex_spin_exit(&cs->cs_lock); 624 625 /* Make sure zsparam will see changes. */ 626 tp->t_ospeed = 0; 627 ttyunlock(tp); 628 (void) zsparam(tp, &t); 629 ttylock(tp); 630 631 /* 632 * Note: zsparam has done: cflag, ispeed, ospeed 633 * so we just need to do: iflag, oflag, lflag, cc 634 * For "raw" mode, just leave all zeros. 635 */ 636 if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_RAW)) { 637 tp->t_iflag = TTYDEF_IFLAG; 638 tp->t_oflag = TTYDEF_OFLAG; 639 tp->t_lflag = TTYDEF_LFLAG; 640 } else { 641 tp->t_iflag = 0; 642 tp->t_oflag = 0; 643 tp->t_lflag = 0; 644 } 645 ttychars(tp); 646 ttsetwater(tp); 647 648 mutex_spin_enter(&cs->cs_lock); 649 650 /* 651 * Turn on DTR. We must always do this, even if carrier is not 652 * present, because otherwise we'd have to use TIOCSDTR 653 * immediately after setting CLOCAL, which applications do not 654 * expect. We always assert DTR while the device is open 655 * unless explicitly requested to deassert it. 656 */ 657 zs_modem(zst, 1); 658 659 /* Clear the input ring, and unblock. */ 660 zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf; 661 zst->zst_rbavail = zstty_rbuf_size; 662 zs_iflush(cs); 663 CLR(zst->zst_rx_flags, RX_ANY_BLOCK); 664 zs_hwiflow(zst); 665 666 mutex_spin_exit(&cs->cs_lock); 667 } 668 669 ttyunlock(tp); 670 671 error = ttyopen(tp, ZSDIALOUT(dev), ISSET(flags, O_NONBLOCK)); 672 if (error) 673 goto bad; 674 675 error = (*tp->t_linesw->l_open)(dev, tp); 676 if (error) 677 goto bad; 678 679 return (0); 680 681 bad: 682 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 683 /* 684 * We failed to open the device, and nobody else had it opened. 685 * Clean up the state as appropriate. 686 */ 687 zs_shutdown(zst); 688 } 689 690 return (error); 691 } 692 693 /* 694 * Close a zs serial port. 695 */ 696 int 697 zsclose(dev_t dev, int flags, int mode, struct lwp *l) 698 { 699 struct zstty_softc *zst; 700 struct tty *tp; 701 702 zst = device_lookup_private(&zstty_cd, ZSUNIT(dev)); 703 tp = zst->zst_tty; 704 705 /* XXX This is for cons.c. */ 706 if (!ISSET(tp->t_state, TS_ISOPEN)) 707 return 0; 708 709 (*tp->t_linesw->l_close)(tp, flags); 710 ttyclose(tp); 711 712 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 713 /* 714 * Although we got a last close, the device may still be in 715 * use; e.g. if this was the dialout node, and there are still 716 * processes waiting for carrier on the non-dialout node. 717 */ 718 zs_shutdown(zst); 719 } 720 721 return (0); 722 } 723 724 /* 725 * Read/write zs serial port. 726 */ 727 int 728 zsread(dev_t dev, struct uio *uio, int flags) 729 { 730 struct zstty_softc *zst; 731 struct tty *tp; 732 733 zst = device_lookup_private(&zstty_cd, ZSUNIT(dev)); 734 tp = zst->zst_tty; 735 736 return ((*tp->t_linesw->l_read)(tp, uio, flags)); 737 } 738 739 int 740 zswrite(dev_t dev, struct uio *uio, int flags) 741 { 742 struct zstty_softc *zst; 743 struct tty *tp; 744 745 zst = device_lookup_private(&zstty_cd, ZSUNIT(dev)); 746 tp = zst->zst_tty; 747 748 return ((*tp->t_linesw->l_write)(tp, uio, flags)); 749 } 750 751 int 752 zspoll(dev_t dev, int events, struct lwp *l) 753 { 754 struct zstty_softc *zst; 755 struct tty *tp; 756 757 zst = device_lookup_private(&zstty_cd, ZSUNIT(dev)); 758 tp = zst->zst_tty; 759 760 return ((*tp->t_linesw->l_poll)(tp, events, l)); 761 } 762 763 int 764 zsioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 765 { 766 struct zstty_softc *zst; 767 struct zs_chanstate *cs; 768 struct tty *tp; 769 int error; 770 771 zst = device_lookup_private(&zstty_cd, ZSUNIT(dev)); 772 cs = zst->zst_cs; 773 tp = zst->zst_tty; 774 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 775 if (error != EPASSTHROUGH) 776 return (error); 777 778 error = ttioctl(tp, cmd, data, flag, l); 779 if (error != EPASSTHROUGH) 780 return (error); 781 782 #ifdef ZS_MD_IOCTL 783 error = ZS_MD_IOCTL(cs, cmd, data); 784 if (error != EPASSTHROUGH) 785 return (error); 786 #endif /* ZS_MD_IOCTL */ 787 788 error = 0; 789 790 mutex_spin_enter(&cs->cs_lock); 791 792 switch (cmd) { 793 case TIOCSBRK: 794 zs_break(cs, 1); 795 break; 796 797 case TIOCCBRK: 798 zs_break(cs, 0); 799 break; 800 801 case TIOCGFLAGS: 802 *(int *)data = zst->zst_swflags; 803 break; 804 805 case TIOCSFLAGS: 806 error = kauth_authorize_device_tty(l->l_cred, 807 KAUTH_DEVICE_TTY_PRIVSET, tp); 808 if (error) 809 break; 810 zst->zst_swflags = *(int *)data; 811 break; 812 813 case TIOCSDTR: 814 zs_modem(zst, 1); 815 break; 816 817 case TIOCCDTR: 818 zs_modem(zst, 0); 819 break; 820 821 case TIOCMSET: 822 case TIOCMBIS: 823 case TIOCMBIC: 824 tiocm_to_zs(zst, cmd, *(int *)data); 825 break; 826 827 case TIOCMGET: 828 *(int *)data = zs_to_tiocm(zst); 829 break; 830 831 case PPS_IOC_CREATE: 832 case PPS_IOC_DESTROY: 833 case PPS_IOC_GETPARAMS: 834 case PPS_IOC_SETPARAMS: 835 case PPS_IOC_GETCAP: 836 case PPS_IOC_FETCH: 837 #ifdef PPS_SYNC 838 case PPS_IOC_KCBIND: 839 #endif 840 mutex_spin_enter(&timecounter_lock); 841 error = pps_ioctl(cmd, data, &zst->zst_pps_state); 842 if (zst->zst_pps_state.ppsparam.mode & PPS_CAPTUREBOTH) 843 zst->zst_ppsmask = ZSRR0_DCD; 844 else 845 zst->zst_ppsmask = 0; 846 mutex_spin_exit(&timecounter_lock); 847 break; 848 849 case TIOCDCDTIMESTAMP: /* XXX old, overloaded API used by xntpd v3 */ 850 if (cs->cs_rr0_pps == 0) { 851 error = EINVAL; 852 break; 853 } 854 mutex_spin_enter(&timecounter_lock); 855 #ifndef PPS_TRAILING_EDGE 856 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 857 &zst->zst_pps_state.ppsinfo.assert_timestamp); 858 #else 859 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 860 &zst->zst_pps_state.ppsinfo.clear_timestamp); 861 #endif 862 mutex_spin_exit(&timecounter_lock); 863 /* 864 * Now update interrupts. 865 */ 866 zs_maskintr(zst); 867 /* 868 * If nothing is being transmitted, set up new current values, 869 * else mark them as pending. 870 */ 871 if (!cs->cs_heldchange) { 872 if (zst->zst_tx_busy) { 873 zst->zst_heldtbc = zst->zst_tbc; 874 zst->zst_tbc = 0; 875 cs->cs_heldchange = 1; 876 } else 877 zs_loadchannelregs(cs); 878 } 879 880 break; 881 882 default: 883 error = EPASSTHROUGH; 884 break; 885 } 886 887 mutex_spin_exit(&cs->cs_lock); 888 889 return (error); 890 } 891 892 /* 893 * Start or restart transmission. 894 */ 895 static void 896 zsstart(struct tty *tp) 897 { 898 struct zstty_softc *zst; 899 struct zs_chanstate *cs; 900 u_char *tba; 901 int tbc; 902 903 zst = device_lookup_private(&zstty_cd, ZSUNIT(tp->t_dev)); 904 cs = zst->zst_cs; 905 906 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 907 return; 908 if (zst->zst_tx_stopped) 909 return; 910 if (!ttypull(tp)) 911 return; 912 913 /* Grab the first contiguous region of buffer space. */ 914 tba = tp->t_outq.c_cf; 915 tbc = ndqb(&tp->t_outq, 0); 916 917 mutex_spin_enter(&cs->cs_lock); 918 919 zst->zst_tba = tba; 920 zst->zst_tbc = tbc; 921 SET(tp->t_state, TS_BUSY); 922 zst->zst_tx_busy = 1; 923 924 #ifdef ZS_TXDMA 925 if (zst->zst_tbc > 1) { 926 zs_dma_setup(cs, zst->zst_tba, zst->zst_tbc); 927 mutex_spin_exit(&cs->cs_lock); 928 return; 929 } 930 #endif 931 932 /* Output the first character of the contiguous buffer. */ 933 zs_write_data(cs, *zst->zst_tba); 934 zst->zst_tbc--; 935 zst->zst_tba++; 936 937 mutex_spin_exit(&cs->cs_lock); 938 } 939 940 /* 941 * Stop output, e.g., for ^S or output flush. 942 */ 943 void 944 zsstop(struct tty *tp, int flag) 945 { 946 struct zstty_softc *zst; 947 948 zst = device_lookup_private(&zstty_cd, ZSUNIT(tp->t_dev)); 949 950 mutex_spin_enter(&zst->zst_cs->cs_lock); 951 if (ISSET(tp->t_state, TS_BUSY)) { 952 /* Stop transmitting at the next chunk. */ 953 zst->zst_tbc = 0; 954 zst->zst_heldtbc = 0; 955 if (!ISSET(tp->t_state, TS_TTSTOP)) 956 SET(tp->t_state, TS_FLUSH); 957 } 958 mutex_spin_exit(&zst->zst_cs->cs_lock); 959 } 960 961 /* 962 * Set ZS tty parameters from termios. 963 * XXX - Should just copy the whole termios after 964 * making sure all the changes could be done. 965 */ 966 static int 967 zsparam(struct tty *tp, struct termios *t) 968 { 969 struct zstty_softc *zst; 970 struct zs_chanstate *cs; 971 int ospeed; 972 tcflag_t cflag; 973 uint8_t tmp3, tmp4, tmp5; 974 int error; 975 976 zst = device_lookup_private(&zstty_cd, ZSUNIT(tp->t_dev)); 977 cs = zst->zst_cs; 978 ospeed = t->c_ospeed; 979 cflag = t->c_cflag; 980 981 /* Check requested parameters. */ 982 if (ospeed < 0) 983 return (EINVAL); 984 if (t->c_ispeed && t->c_ispeed != ospeed) 985 return (EINVAL); 986 987 /* 988 * For the console, always force CLOCAL and !HUPCL, so that the port 989 * is always active. 990 */ 991 if (ISSET(zst->zst_swflags, TIOCFLAG_SOFTCAR) || 992 ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 993 SET(cflag, CLOCAL); 994 CLR(cflag, HUPCL); 995 } 996 997 /* 998 * Only whack the UART when params change. 999 * Some callers need to clear tp->t_ospeed 1000 * to make sure initialization gets done. 1001 */ 1002 if (tp->t_ospeed == ospeed && 1003 tp->t_cflag == cflag) 1004 return (0); 1005 1006 /* 1007 * Call MD functions to deal with changed 1008 * clock modes or H/W flow control modes. 1009 * The BRG divisor is set now. (reg 12,13) 1010 */ 1011 error = zs_set_speed(cs, ospeed); 1012 if (error) 1013 return (error); 1014 error = zs_set_modes(cs, cflag); 1015 if (error) 1016 return (error); 1017 1018 /* 1019 * Block interrupts so that state will not 1020 * be altered until we are done setting it up. 1021 * 1022 * Initial values in cs_preg are set before 1023 * our attach routine is called. The master 1024 * interrupt enable is handled by zsc.c 1025 * 1026 */ 1027 mutex_spin_enter(&cs->cs_lock); 1028 1029 /* 1030 * Recalculate which status ints to enable. 1031 */ 1032 zs_maskintr(zst); 1033 1034 /* Recompute character size bits. */ 1035 tmp3 = cs->cs_preg[3]; 1036 tmp5 = cs->cs_preg[5]; 1037 CLR(tmp3, ZSWR3_RXSIZE); 1038 CLR(tmp5, ZSWR5_TXSIZE); 1039 switch (ISSET(cflag, CSIZE)) { 1040 case CS5: 1041 SET(tmp3, ZSWR3_RX_5); 1042 SET(tmp5, ZSWR5_TX_5); 1043 break; 1044 case CS6: 1045 SET(tmp3, ZSWR3_RX_6); 1046 SET(tmp5, ZSWR5_TX_6); 1047 break; 1048 case CS7: 1049 SET(tmp3, ZSWR3_RX_7); 1050 SET(tmp5, ZSWR5_TX_7); 1051 break; 1052 case CS8: 1053 SET(tmp3, ZSWR3_RX_8); 1054 SET(tmp5, ZSWR5_TX_8); 1055 break; 1056 } 1057 cs->cs_preg[3] = tmp3; 1058 cs->cs_preg[5] = tmp5; 1059 1060 /* 1061 * Recompute the stop bits and parity bits. Note that 1062 * zs_set_speed() may have set clock selection bits etc. 1063 * in wr4, so those must preserved. 1064 */ 1065 tmp4 = cs->cs_preg[4]; 1066 CLR(tmp4, ZSWR4_SBMASK | ZSWR4_PARMASK); 1067 if (ISSET(cflag, CSTOPB)) 1068 SET(tmp4, ZSWR4_TWOSB); 1069 else 1070 SET(tmp4, ZSWR4_ONESB); 1071 if (!ISSET(cflag, PARODD)) 1072 SET(tmp4, ZSWR4_EVENP); 1073 if (ISSET(cflag, PARENB)) 1074 SET(tmp4, ZSWR4_PARENB); 1075 cs->cs_preg[4] = tmp4; 1076 1077 /* And copy to tty. */ 1078 tp->t_ispeed = 0; 1079 tp->t_ospeed = ospeed; 1080 tp->t_cflag = cflag; 1081 1082 /* 1083 * If nothing is being transmitted, set up new current values, 1084 * else mark them as pending. 1085 */ 1086 if (!cs->cs_heldchange) { 1087 if (zst->zst_tx_busy) { 1088 zst->zst_heldtbc = zst->zst_tbc; 1089 zst->zst_tbc = 0; 1090 cs->cs_heldchange = 1; 1091 } else 1092 zs_loadchannelregs(cs); 1093 } 1094 1095 /* 1096 * If hardware flow control is disabled, turn off the buffer water 1097 * marks and unblock any soft flow control state. Otherwise, enable 1098 * the water marks. 1099 */ 1100 if (!ISSET(cflag, CHWFLOW)) { 1101 zst->zst_r_hiwat = 0; 1102 zst->zst_r_lowat = 0; 1103 if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1104 CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1105 zst->zst_rx_ready = 1; 1106 cs->cs_softreq = 1; 1107 } 1108 if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 1109 CLR(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 1110 zs_hwiflow(zst); 1111 } 1112 } else { 1113 zst->zst_r_hiwat = zstty_rbuf_hiwat; 1114 zst->zst_r_lowat = zstty_rbuf_lowat; 1115 } 1116 1117 /* 1118 * Force a recheck of the hardware carrier and flow control status, 1119 * since we may have changed which bits we're looking at. 1120 */ 1121 zstty_stint(cs, 1); 1122 1123 mutex_spin_exit(&cs->cs_lock); 1124 1125 /* 1126 * If hardware flow control is disabled, unblock any hard flow control 1127 * state. 1128 */ 1129 if (!ISSET(cflag, CHWFLOW)) { 1130 if (zst->zst_tx_stopped) { 1131 zst->zst_tx_stopped = 0; 1132 zsstart(tp); 1133 } 1134 } 1135 1136 zstty_softint1(cs); 1137 1138 return (0); 1139 } 1140 1141 /* 1142 * Compute interrupt enable bits and set in the pending bits. Called both 1143 * in zsparam() and when PPS (pulse per second timing) state changes. 1144 * Must be called at splzs(). 1145 */ 1146 static void 1147 zs_maskintr(struct zstty_softc *zst) 1148 { 1149 struct zs_chanstate *cs = zst->zst_cs; 1150 uint8_t tmp15; 1151 1152 cs->cs_rr0_mask = cs->cs_rr0_cts | cs->cs_rr0_dcd; 1153 if (zst->zst_ppsmask != 0) 1154 cs->cs_rr0_mask |= cs->cs_rr0_pps; 1155 tmp15 = cs->cs_preg[15]; 1156 if (ISSET(cs->cs_rr0_mask, ZSRR0_DCD)) 1157 SET(tmp15, ZSWR15_DCD_IE); 1158 else 1159 CLR(tmp15, ZSWR15_DCD_IE); 1160 if (ISSET(cs->cs_rr0_mask, ZSRR0_CTS)) 1161 SET(tmp15, ZSWR15_CTS_IE); 1162 else 1163 CLR(tmp15, ZSWR15_CTS_IE); 1164 cs->cs_preg[15] = tmp15; 1165 } 1166 1167 1168 /* 1169 * Raise or lower modem control (DTR/RTS) signals. If a character is 1170 * in transmission, the change is deferred. 1171 * Called at splzs() and with the channel lock held. 1172 */ 1173 static void 1174 zs_modem(struct zstty_softc *zst, int onoff) 1175 { 1176 struct zs_chanstate *cs = zst->zst_cs, *ccs; 1177 1178 if (cs->cs_wr5_dtr == 0) 1179 return; 1180 1181 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs); 1182 1183 if (onoff) 1184 SET(ccs->cs_preg[5], cs->cs_wr5_dtr); 1185 else 1186 CLR(ccs->cs_preg[5], cs->cs_wr5_dtr); 1187 1188 if (!cs->cs_heldchange) { 1189 if (zst->zst_tx_busy) { 1190 zst->zst_heldtbc = zst->zst_tbc; 1191 zst->zst_tbc = 0; 1192 cs->cs_heldchange = 1; 1193 } else 1194 zs_loadchannelregs(cs); 1195 } 1196 } 1197 1198 /* 1199 * Set modem bits. 1200 * Called at splzs() and with the channel lock held. 1201 */ 1202 static void 1203 tiocm_to_zs(struct zstty_softc *zst, u_long how, int ttybits) 1204 { 1205 struct zs_chanstate *cs = zst->zst_cs, *ccs; 1206 uint8_t zsbits; 1207 1208 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs); 1209 1210 zsbits = 0; 1211 if (ISSET(ttybits, TIOCM_DTR)) 1212 SET(zsbits, ZSWR5_DTR); 1213 if (ISSET(ttybits, TIOCM_RTS)) 1214 SET(zsbits, ZSWR5_RTS); 1215 1216 switch (how) { 1217 case TIOCMBIC: 1218 CLR(ccs->cs_preg[5], zsbits); 1219 break; 1220 1221 case TIOCMBIS: 1222 SET(ccs->cs_preg[5], zsbits); 1223 break; 1224 1225 case TIOCMSET: 1226 CLR(ccs->cs_preg[5], ZSWR5_RTS | ZSWR5_DTR); 1227 SET(ccs->cs_preg[5], zsbits); 1228 break; 1229 } 1230 1231 if (!cs->cs_heldchange) { 1232 if (zst->zst_tx_busy) { 1233 zst->zst_heldtbc = zst->zst_tbc; 1234 zst->zst_tbc = 0; 1235 cs->cs_heldchange = 1; 1236 } else 1237 zs_loadchannelregs(cs); 1238 } 1239 } 1240 1241 /* 1242 * Get modem bits. 1243 * Called at splzs() and with the channel lock held. 1244 */ 1245 static int 1246 zs_to_tiocm(struct zstty_softc *zst) 1247 { 1248 struct zs_chanstate *cs = zst->zst_cs, *ccs; 1249 uint8_t zsbits; 1250 int ttybits = 0; 1251 1252 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs); 1253 1254 zsbits = ccs->cs_preg[5]; 1255 if (ISSET(zsbits, ZSWR5_DTR)) 1256 SET(ttybits, TIOCM_DTR); 1257 if (ISSET(zsbits, ZSWR5_RTS)) 1258 SET(ttybits, TIOCM_RTS); 1259 1260 zsbits = cs->cs_rr0; 1261 if (ISSET(zsbits, ZSRR0_DCD)) 1262 SET(ttybits, TIOCM_CD); 1263 if (ISSET(zsbits, ZSRR0_CTS)) 1264 SET(ttybits, TIOCM_CTS); 1265 1266 return (ttybits); 1267 } 1268 1269 /* 1270 * Try to block or unblock input using hardware flow-control. 1271 * This is called by kern/tty.c if MDMBUF|CRTSCTS is set, and 1272 * if this function returns non-zero, the TS_TBLOCK flag will 1273 * be set or cleared according to the "block" arg passed. 1274 */ 1275 int 1276 zshwiflow(struct tty *tp, int block) 1277 { 1278 struct zstty_softc *zst; 1279 struct zs_chanstate *cs; 1280 1281 zst = device_lookup_private(&zstty_cd, ZSUNIT(tp->t_dev)); 1282 cs = zst->zst_cs; 1283 1284 if (cs->cs_wr5_rts == 0) 1285 return (0); 1286 1287 mutex_spin_enter(&cs->cs_lock); 1288 if (block) { 1289 if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1290 SET(zst->zst_rx_flags, RX_TTY_BLOCKED); 1291 zs_hwiflow(zst); 1292 } 1293 } else { 1294 if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1295 CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1296 zst->zst_rx_ready = 1; 1297 cs->cs_softreq = 1; 1298 } 1299 if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1300 CLR(zst->zst_rx_flags, RX_TTY_BLOCKED); 1301 zs_hwiflow(zst); 1302 } 1303 } 1304 mutex_spin_exit(&cs->cs_lock); 1305 return (1); 1306 } 1307 1308 /* 1309 * Internal version of zshwiflow 1310 * Called at splzs() and with the channel lock held. 1311 */ 1312 static void 1313 zs_hwiflow(struct zstty_softc *zst) 1314 { 1315 struct zs_chanstate *cs = zst->zst_cs, *ccs; 1316 1317 if (cs->cs_wr5_rts == 0) 1318 return; 1319 1320 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs); 1321 1322 if (ISSET(zst->zst_rx_flags, RX_ANY_BLOCK)) { 1323 CLR(ccs->cs_preg[5], cs->cs_wr5_rts); 1324 CLR(ccs->cs_creg[5], cs->cs_wr5_rts); 1325 } else { 1326 SET(ccs->cs_preg[5], cs->cs_wr5_rts); 1327 SET(ccs->cs_creg[5], cs->cs_wr5_rts); 1328 } 1329 zs_write_reg(ccs, 5, ccs->cs_creg[5]); 1330 } 1331 1332 1333 /**************************************************************** 1334 * Interface to the lower layer (zscc) 1335 ****************************************************************/ 1336 1337 #define integrate static inline 1338 integrate void zstty_rxsoft(struct zstty_softc *, struct tty *); 1339 integrate void zstty_txsoft(struct zstty_softc *, struct tty *); 1340 integrate void zstty_stsoft(struct zstty_softc *, struct tty *); 1341 static void zstty_diag(void *); 1342 1343 /* 1344 * Receiver Ready interrupt. 1345 * Called at splzs() and with the channel lock held. 1346 */ 1347 static void 1348 zstty_rxint(struct zs_chanstate *cs) 1349 { 1350 struct zstty_softc *zst = cs->cs_private; 1351 uint8_t *put, *end; 1352 u_int cc; 1353 uint8_t rr0, rr1, c; 1354 1355 end = zst->zst_ebuf; 1356 put = zst->zst_rbput; 1357 cc = zst->zst_rbavail; 1358 1359 while (cc > 0) { 1360 /* 1361 * First read the status, because reading the received char 1362 * destroys the status of this char. 1363 */ 1364 rr1 = zs_read_reg(cs, 1); 1365 c = zs_read_data(cs); 1366 1367 if (ISSET(rr1, ZSRR1_FE | ZSRR1_DO | ZSRR1_PE)) { 1368 /* Clear the receive error. */ 1369 zs_write_csr(cs, ZSWR0_RESET_ERRORS); 1370 } 1371 1372 cn_check_magic(zst->zst_tty->t_dev, c, zstty_cnm_state); 1373 put[0] = c; 1374 put[1] = rr1; 1375 put += 2; 1376 if (put >= end) 1377 put = zst->zst_rbuf; 1378 cc--; 1379 1380 rr0 = zs_read_csr(cs); 1381 if (!ISSET(rr0, ZSRR0_RX_READY)) 1382 break; 1383 } 1384 1385 /* 1386 * Current string of incoming characters ended because 1387 * no more data was available or we ran out of space. 1388 * Schedule a receive event if any data was received. 1389 * If we're out of space, turn off receive interrupts. 1390 */ 1391 zst->zst_rbput = put; 1392 zst->zst_rbavail = cc; 1393 if (!ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1394 zst->zst_rx_ready = 1; 1395 cs->cs_softreq = 1; 1396 } 1397 1398 /* 1399 * See if we are in danger of overflowing a buffer. If 1400 * so, use hardware flow control to ease the pressure. 1401 */ 1402 if (!ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED) && 1403 cc < zst->zst_r_hiwat) { 1404 SET(zst->zst_rx_flags, RX_IBUF_BLOCKED); 1405 zs_hwiflow(zst); 1406 } 1407 1408 /* 1409 * If we're out of space, disable receive interrupts 1410 * until the queue has drained a bit. 1411 */ 1412 if (!cc) { 1413 SET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED); 1414 CLR(cs->cs_preg[1], ZSWR1_RIE); 1415 cs->cs_creg[1] = cs->cs_preg[1]; 1416 zs_write_reg(cs, 1, cs->cs_creg[1]); 1417 } 1418 1419 #if 0 1420 printf("%xH%04d\n", zst->zst_rx_flags, zst->zst_rbavail); 1421 #endif 1422 } 1423 1424 /* 1425 * Transmitter Ready interrupt. 1426 * Called at splzs() and with the channel lock held. 1427 */ 1428 static void 1429 zstty_txint(struct zs_chanstate *cs) 1430 { 1431 struct zstty_softc *zst = cs->cs_private; 1432 1433 zs_write_csr(cs, ZSWR0_RESET_TXINT); 1434 1435 /* 1436 * If we've delayed a parameter change, do it now, and restart 1437 * output. 1438 */ 1439 if (cs->cs_heldchange) { 1440 zs_loadchannelregs(cs); 1441 cs->cs_heldchange = 0; 1442 zst->zst_tbc = zst->zst_heldtbc; 1443 zst->zst_heldtbc = 0; 1444 } 1445 1446 /* Output the next character in the buffer, if any. */ 1447 if (zst->zst_tbc > 0) { 1448 zs_write_data(cs, *zst->zst_tba); 1449 zst->zst_tbc--; 1450 zst->zst_tba++; 1451 } else { 1452 if (zst->zst_tx_busy) { 1453 zst->zst_tx_busy = 0; 1454 zst->zst_tx_done = 1; 1455 cs->cs_softreq = 1; 1456 } 1457 } 1458 } 1459 1460 /* 1461 * Status Change interrupt. 1462 * Called at splzs() and with the channel lock held. 1463 */ 1464 static void 1465 zstty_stint(struct zs_chanstate *cs, int force) 1466 { 1467 struct zstty_softc *zst = cs->cs_private; 1468 uint8_t rr0, delta; 1469 1470 rr0 = zs_read_csr(cs); 1471 zs_write_csr(cs, ZSWR0_RESET_STATUS); 1472 1473 /* 1474 * Check here for console break, so that we can abort 1475 * even when interrupts are locking up the machine. 1476 */ 1477 if (ISSET(rr0, ZSRR0_BREAK)) 1478 cn_check_magic(zst->zst_tty->t_dev, CNC_BREAK, zstty_cnm_state); 1479 1480 if (!force) 1481 delta = rr0 ^ cs->cs_rr0; 1482 else 1483 delta = cs->cs_rr0_mask; 1484 cs->cs_rr0 = rr0; 1485 1486 if (ISSET(delta, cs->cs_rr0_mask)) { 1487 SET(cs->cs_rr0_delta, delta); 1488 1489 /* 1490 * Pulse-per-second clock signal on edge of DCD? 1491 */ 1492 if (ISSET(delta, zst->zst_ppsmask)) { 1493 if (zst->zst_pps_state.ppsparam.mode & 1494 PPS_CAPTUREBOTH) { 1495 mutex_spin_enter(&timecounter_lock); 1496 pps_capture(&zst->zst_pps_state); 1497 pps_event(&zst->zst_pps_state, 1498 (ISSET(cs->cs_rr0, zst->zst_ppsmask)) 1499 ? PPS_CAPTUREASSERT 1500 : PPS_CAPTURECLEAR); 1501 mutex_spin_exit(&timecounter_lock); 1502 } 1503 } 1504 1505 /* 1506 * Stop output immediately if we lose the output 1507 * flow control signal or carrier detect. 1508 */ 1509 if (ISSET(~rr0, cs->cs_rr0_mask)) { 1510 zst->zst_tbc = 0; 1511 zst->zst_heldtbc = 0; 1512 } 1513 1514 zst->zst_st_check = 1; 1515 cs->cs_softreq = 1; 1516 } 1517 } 1518 1519 void 1520 zstty_diag(void *arg) 1521 { 1522 struct zstty_softc *zst = arg; 1523 int overflows, floods; 1524 1525 mutex_spin_enter(&zst->zst_cs->cs_lock); 1526 overflows = zst->zst_overflows; 1527 zst->zst_overflows = 0; 1528 floods = zst->zst_floods; 1529 zst->zst_floods = 0; 1530 zst->zst_errors = 0; 1531 mutex_spin_exit(&zst->zst_cs->cs_lock); 1532 1533 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1534 device_xname(zst->zst_dev), 1535 overflows, overflows == 1 ? "" : "s", 1536 floods, floods == 1 ? "" : "s"); 1537 } 1538 1539 integrate void 1540 zstty_rxsoft(struct zstty_softc *zst, struct tty *tp) 1541 { 1542 struct zs_chanstate *cs = zst->zst_cs; 1543 int (*rint)(int, struct tty *) = tp->t_linesw->l_rint; 1544 uint8_t *get, *end; 1545 u_int cc, scc; 1546 uint8_t rr1; 1547 int code; 1548 1549 end = zst->zst_ebuf; 1550 get = zst->zst_rbget; 1551 scc = cc = zstty_rbuf_size - zst->zst_rbavail; 1552 1553 if (cc == zstty_rbuf_size) { 1554 zst->zst_floods++; 1555 if (zst->zst_errors++ == 0) 1556 callout_reset(&zst->zst_diag_ch, 60 * hz, 1557 zstty_diag, zst); 1558 } 1559 1560 /* If not yet open, drop the entire buffer content here */ 1561 if (!ISSET(tp->t_state, TS_ISOPEN)) { 1562 get += cc << 1; 1563 if (get >= end) 1564 get -= zstty_rbuf_size << 1; 1565 cc = 0; 1566 } 1567 while (cc) { 1568 code = get[0]; 1569 rr1 = get[1]; 1570 if (ISSET(rr1, ZSRR1_DO | ZSRR1_FE | ZSRR1_PE)) { 1571 if (ISSET(rr1, ZSRR1_DO)) { 1572 zst->zst_overflows++; 1573 if (zst->zst_errors++ == 0) 1574 callout_reset(&zst->zst_diag_ch, 1575 60 * hz, zstty_diag, zst); 1576 } 1577 if (ISSET(rr1, ZSRR1_FE)) 1578 SET(code, TTY_FE); 1579 if (ISSET(rr1, ZSRR1_PE)) 1580 SET(code, TTY_PE); 1581 } 1582 if ((*rint)(code, tp) == -1) { 1583 /* 1584 * The line discipline's buffer is out of space. 1585 */ 1586 if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1587 /* 1588 * We're either not using flow control, or the 1589 * line discipline didn't tell us to block for 1590 * some reason. Either way, we have no way to 1591 * know when there's more space available, so 1592 * just drop the rest of the data. 1593 */ 1594 get += cc << 1; 1595 if (get >= end) 1596 get -= zstty_rbuf_size << 1; 1597 cc = 0; 1598 } else { 1599 /* 1600 * Don't schedule any more receive processing 1601 * until the line discipline tells us there's 1602 * space available (through comhwiflow()). 1603 * Leave the rest of the data in the input 1604 * buffer. 1605 */ 1606 SET(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1607 } 1608 break; 1609 } 1610 get += 2; 1611 if (get >= end) 1612 get = zst->zst_rbuf; 1613 cc--; 1614 } 1615 1616 if (cc != scc) { 1617 zst->zst_rbget = get; 1618 mutex_spin_enter(&cs->cs_lock); 1619 cc = zst->zst_rbavail += scc - cc; 1620 /* Buffers should be ok again, release possible block. */ 1621 if (cc >= zst->zst_r_lowat) { 1622 if (ISSET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED)) { 1623 CLR(zst->zst_rx_flags, RX_IBUF_OVERFLOWED); 1624 SET(cs->cs_preg[1], ZSWR1_RIE); 1625 cs->cs_creg[1] = cs->cs_preg[1]; 1626 zs_write_reg(cs, 1, cs->cs_creg[1]); 1627 } 1628 if (ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED)) { 1629 CLR(zst->zst_rx_flags, RX_IBUF_BLOCKED); 1630 zs_hwiflow(zst); 1631 } 1632 } 1633 mutex_spin_exit(&cs->cs_lock); 1634 } 1635 1636 #if 0 1637 printf("%xS%04d\n", zst->zst_rx_flags, zst->zst_rbavail); 1638 #endif 1639 } 1640 1641 integrate void 1642 zstty_txsoft(struct zstty_softc *zst, struct tty *tp) 1643 { 1644 struct zs_chanstate *cs = zst->zst_cs; 1645 1646 mutex_spin_enter(&cs->cs_lock); 1647 CLR(tp->t_state, TS_BUSY); 1648 if (ISSET(tp->t_state, TS_FLUSH)) 1649 CLR(tp->t_state, TS_FLUSH); 1650 else 1651 ndflush(&tp->t_outq, (int)(zst->zst_tba - tp->t_outq.c_cf)); 1652 mutex_spin_exit(&cs->cs_lock); 1653 (*tp->t_linesw->l_start)(tp); 1654 } 1655 1656 integrate void 1657 zstty_stsoft(struct zstty_softc *zst, struct tty *tp) 1658 { 1659 struct zs_chanstate *cs = zst->zst_cs; 1660 uint8_t rr0, delta; 1661 1662 mutex_spin_enter(&cs->cs_lock); 1663 rr0 = cs->cs_rr0; 1664 delta = cs->cs_rr0_delta; 1665 cs->cs_rr0_delta = 0; 1666 mutex_spin_exit(&cs->cs_lock); 1667 1668 if (ISSET(delta, cs->cs_rr0_dcd)) { 1669 /* 1670 * Inform the tty layer that carrier detect changed. 1671 */ 1672 (void) (*tp->t_linesw->l_modem)(tp, ISSET(rr0, ZSRR0_DCD)); 1673 } 1674 1675 if (ISSET(delta, cs->cs_rr0_cts)) { 1676 /* Block or unblock output according to flow control. */ 1677 if (ISSET(rr0, cs->cs_rr0_cts)) { 1678 zst->zst_tx_stopped = 0; 1679 (*tp->t_linesw->l_start)(tp); 1680 } else { 1681 zst->zst_tx_stopped = 1; 1682 } 1683 } 1684 } 1685 1686 /* 1687 * Software interrupt. Called at zssoft 1688 * 1689 * The main job to be done here is to empty the input ring 1690 * by passing its contents up to the tty layer. The ring is 1691 * always emptied during this operation, therefore the ring 1692 * must not be larger than the space after "high water" in 1693 * the tty layer, or the tty layer might drop our input. 1694 * 1695 * Note: an "input blockage" condition is assumed to exist if 1696 * EITHER the TS_TBLOCK flag or zst_rx_blocked flag is set. 1697 */ 1698 static void 1699 zstty_softint(struct zs_chanstate *cs) 1700 { 1701 1702 zstty_softint1(cs); 1703 } 1704 1705 static void 1706 zstty_softint1(struct zs_chanstate *cs) 1707 { 1708 struct zstty_softc *zst = cs->cs_private; 1709 struct tty *tp = zst->zst_tty; 1710 1711 1712 if (zst->zst_rx_ready) { 1713 zst->zst_rx_ready = 0; 1714 zstty_rxsoft(zst, tp); 1715 } 1716 1717 if (zst->zst_st_check) { 1718 zst->zst_st_check = 0; 1719 zstty_stsoft(zst, tp); 1720 } 1721 1722 if (zst->zst_tx_done) { 1723 zst->zst_tx_done = 0; 1724 zstty_txsoft(zst, tp); 1725 } 1726 } 1727 1728 struct zsops zsops_tty = { 1729 zstty_rxint, /* receive char available */ 1730 zstty_stint, /* external/status */ 1731 zstty_txint, /* xmit buffer empty */ 1732 zstty_softint, /* process software interrupt */ 1733 }; 1734 1735 #ifdef ZS_TXDMA 1736 void 1737 zstty_txdma_int(void *arg) 1738 { 1739 struct zs_chanstate *cs = arg; 1740 struct zstty_softc *zst = cs->cs_private; 1741 1742 zst->zst_tba += zst->zst_tbc; 1743 zst->zst_tbc = 0; 1744 1745 if (zst->zst_tx_busy) { 1746 zst->zst_tx_busy = 0; 1747 zst->zst_tx_done = 1; 1748 cs->cs_softreq = 1; 1749 } 1750 } 1751 #endif
Cache object: b3804bd7f43a44beb1eea29987dc66e5
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]