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sys/dev/ic/z8530tty.c
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1 /* $NetBSD: z8530tty.c,v 1.123.12.1 2011/01/16 12:54:43 bouyer 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 1.123.12.1 2011/01/16 12:54:43 bouyer 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 zsopen, zsclose, zsread, zswrite, zsioctl, 256 zsstop, zstty, zspoll, nommap, ttykqfilter, D_TTY 257 }; 258 259 struct zsops zsops_tty; 260 261 static void zs_shutdown(struct zstty_softc *); 262 static void zsstart(struct tty *); 263 static int zsparam(struct tty *, struct termios *); 264 static void zs_modem(struct zstty_softc *, int); 265 static void tiocm_to_zs(struct zstty_softc *, u_long, int); 266 static int zs_to_tiocm(struct zstty_softc *); 267 static int zshwiflow(struct tty *, int); 268 static void zs_hwiflow(struct zstty_softc *); 269 static void zs_maskintr(struct zstty_softc *); 270 271 /* Low-level routines. */ 272 static void zstty_rxint (struct zs_chanstate *); 273 static void zstty_stint (struct zs_chanstate *, int); 274 static void zstty_txint (struct zs_chanstate *); 275 static void zstty_softint(struct zs_chanstate *); 276 static void zstty_softint1(struct zs_chanstate *); 277 278 #define ZSUNIT(x) (minor(x) & 0x7ffff) 279 #define ZSDIALOUT(x) (minor(x) & 0x80000) 280 281 struct tty *zstty_get_tty_from_dev(struct device *); 282 283 /* 284 * XXX get the (struct tty *) out of a (struct device *) we trust to be a 285 * (struct zstty_softc *) - needed by sparc/dev/zs.c, sparc64/dev/zs.c, 286 * sun3/dev/zs.c and sun2/dev/zs.c will probably need it at some point 287 */ 288 289 struct tty * 290 zstty_get_tty_from_dev(struct device *dev) 291 { 292 struct zstty_softc *sc = device_private(dev); 293 294 return sc->zst_tty; 295 } 296 297 /* 298 * zstty_match: how is this zs channel configured? 299 */ 300 int 301 zstty_match(device_t parent, cfdata_t cf, void *aux) 302 { 303 struct zsc_attach_args *args = aux; 304 305 /* Exact match is better than wildcard. */ 306 if (cf->zsccf_channel == args->channel) 307 return 2; 308 309 /* This driver accepts wildcard. */ 310 if (cf->zsccf_channel == ZSCCF_CHANNEL_DEFAULT) 311 return 1; 312 313 return 0; 314 } 315 316 void 317 zstty_attach(device_t parent, device_t self, void *aux) 318 { 319 struct zstty_softc *zst = device_private(self); 320 struct zsc_softc *zsc = device_private(parent); 321 struct cfdata *cf = device_cfdata(self); 322 struct zsc_attach_args *args = aux; 323 struct zs_chanstate *cs; 324 struct tty *tp; 325 int channel, tty_unit; 326 dev_t dev; 327 const char *i, *o; 328 int dtr_on; 329 int resetbit; 330 331 zst->zst_dev = self; 332 333 callout_init(&zst->zst_diag_ch, 0); 334 cn_init_magic(&zstty_cnm_state); 335 336 tty_unit = device_unit(self); 337 channel = args->channel; 338 cs = zsc->zsc_cs[channel]; 339 cs->cs_private = zst; 340 cs->cs_ops = &zsops_tty; 341 342 zst->zst_cs = cs; 343 zst->zst_swflags = cf->cf_flags; /* softcar, etc. */ 344 zst->zst_hwflags = args->hwflags; 345 dev = makedev(cdevsw_lookup_major(&zstty_cdevsw), tty_unit); 346 347 if (zst->zst_swflags) 348 aprint_normal(" flags 0x%x", zst->zst_swflags); 349 350 /* 351 * Check whether we serve as a console device. 352 * XXX - split console input/output channels aren't 353 * supported yet on /dev/console 354 */ 355 i = o = NULL; 356 if ((zst->zst_hwflags & ZS_HWFLAG_CONSOLE_INPUT) != 0) { 357 i = "input"; 358 if ((args->hwflags & ZS_HWFLAG_USE_CONSDEV) != 0) { 359 args->consdev->cn_dev = dev; 360 cn_tab->cn_pollc = args->consdev->cn_pollc; 361 cn_tab->cn_getc = args->consdev->cn_getc; 362 } 363 cn_tab->cn_dev = dev; 364 /* Set console magic to BREAK */ 365 cn_set_magic("\047\001"); 366 } 367 if ((zst->zst_hwflags & ZS_HWFLAG_CONSOLE_OUTPUT) != 0) { 368 o = "output"; 369 if ((args->hwflags & ZS_HWFLAG_USE_CONSDEV) != 0) { 370 cn_tab->cn_putc = args->consdev->cn_putc; 371 } 372 cn_tab->cn_dev = dev; 373 } 374 if (i != NULL || o != NULL) 375 aprint_normal(" (console %s)", i ? (o ? "i/o" : i) : o); 376 377 #ifdef KGDB 378 if (zs_check_kgdb(cs, dev)) { 379 /* 380 * Allow kgdb to "take over" this port. Returns true 381 * if this serial port is in-use by kgdb. 382 */ 383 aprint_normal(" (kgdb)\n"); 384 /* 385 * This is the kgdb port (exclusive use) 386 * so skip the normal attach code. 387 */ 388 return; 389 } 390 #endif 391 aprint_normal("\n"); 392 393 tp = ttymalloc(); 394 tp->t_dev = dev; 395 tp->t_oproc = zsstart; 396 tp->t_param = zsparam; 397 tp->t_hwiflow = zshwiflow; 398 tty_attach(tp); 399 400 zst->zst_tty = tp; 401 zst->zst_rbuf = malloc(zstty_rbuf_size << 1, M_DEVBUF, M_NOWAIT); 402 if (zst->zst_rbuf == NULL) { 403 aprint_error_dev(zst->zst_dev, 404 "unable to allocate ring buffer\n"); 405 return; 406 } 407 zst->zst_ebuf = zst->zst_rbuf + (zstty_rbuf_size << 1); 408 /* Disable the high water mark. */ 409 zst->zst_r_hiwat = 0; 410 zst->zst_r_lowat = 0; 411 zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf; 412 zst->zst_rbavail = zstty_rbuf_size; 413 414 /* if there are no enable/disable functions, assume the device 415 is always enabled */ 416 if (!cs->enable) 417 cs->enabled = 1; 418 419 /* 420 * Hardware init 421 */ 422 dtr_on = 0; 423 resetbit = 0; 424 if (ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 425 /* Call zsparam similar to open. */ 426 struct termios t; 427 428 /* Wait a while for previous console output to complete */ 429 DELAY(10000); 430 431 /* Setup the "new" parameters in t. */ 432 t.c_ispeed = 0; 433 t.c_ospeed = cs->cs_defspeed; 434 t.c_cflag = cs->cs_defcflag; 435 436 /* 437 * Turn on receiver and status interrupts. 438 * We defer the actual write of the register to zsparam(), 439 * but we must make sure status interrupts are turned on by 440 * the time zsparam() reads the initial rr0 state. 441 */ 442 SET(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE); 443 444 /* Make sure zsparam will see changes. */ 445 tp->t_ospeed = 0; 446 (void) zsparam(tp, &t); 447 448 /* Make sure DTR is on now. */ 449 dtr_on = 1; 450 451 } else if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_NORESET)) { 452 /* Not the console; may need reset. */ 453 resetbit = (channel == 0) ? ZSWR9_A_RESET : ZSWR9_B_RESET; 454 } 455 456 mutex_spin_enter(&cs->cs_lock); 457 if (resetbit) 458 zs_write_reg(cs, 9, resetbit); 459 zs_modem(zst, dtr_on); 460 mutex_spin_exit(&cs->cs_lock); 461 } 462 463 464 /* 465 * Return pointer to our tty. 466 */ 467 struct tty * 468 zstty(dev_t dev) 469 { 470 struct zstty_softc *zst; 471 472 zst = device_lookup_private(&zstty_cd, ZSUNIT(dev)); 473 474 return (zst->zst_tty); 475 } 476 477 478 void 479 zs_shutdown(struct zstty_softc *zst) 480 { 481 struct zs_chanstate *cs = zst->zst_cs; 482 struct tty *tp = zst->zst_tty; 483 484 mutex_spin_enter(&cs->cs_lock); 485 486 /* If we were asserting flow control, then deassert it. */ 487 SET(zst->zst_rx_flags, RX_IBUF_BLOCKED); 488 zs_hwiflow(zst); 489 490 /* Clear any break condition set with TIOCSBRK. */ 491 zs_break(cs, 0); 492 493 /* 494 * Hang up if necessary. Wait a bit, so the other side has time to 495 * notice even if we immediately open the port again. 496 */ 497 if (ISSET(tp->t_cflag, HUPCL)) { 498 zs_modem(zst, 0); 499 mutex_spin_exit(&cs->cs_lock); 500 /* 501 * XXX - another process is not prevented from opening 502 * the device during our sleep. 503 */ 504 (void) tsleep(cs, TTIPRI, ttclos, hz); 505 /* Re-check state in case we were opened during our sleep */ 506 if (ISSET(tp->t_state, TS_ISOPEN) || tp->t_wopen != 0) 507 return; 508 509 mutex_spin_enter(&cs->cs_lock); 510 } 511 512 /* Turn off interrupts if not the console. */ 513 if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 514 CLR(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE); 515 cs->cs_creg[1] = cs->cs_preg[1]; 516 zs_write_reg(cs, 1, cs->cs_creg[1]); 517 } 518 519 /* Call the power management hook. */ 520 if (cs->disable) { 521 #ifdef DIAGNOSTIC 522 if (!cs->enabled) 523 panic("%s: not enabled?", __func__); 524 #endif 525 (*cs->disable)(zst->zst_cs); 526 } 527 528 mutex_spin_exit(&cs->cs_lock); 529 } 530 531 /* 532 * Open a zs serial (tty) port. 533 */ 534 int 535 zsopen(dev_t dev, int flags, int mode, struct lwp *l) 536 { 537 struct zstty_softc *zst; 538 struct zs_chanstate *cs; 539 struct tty *tp; 540 int error; 541 542 zst = device_lookup_private(&zstty_cd, ZSUNIT(dev)); 543 if (zst == NULL) 544 return (ENXIO); 545 546 tp = zst->zst_tty; 547 cs = zst->zst_cs; 548 549 /* If KGDB took the line, then tp==NULL */ 550 if (tp == NULL) 551 return (EBUSY); 552 553 if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp)) 554 return (EBUSY); 555 556 mutex_spin_enter(&tty_lock); 557 558 /* 559 * Do the following iff this is a first open. 560 */ 561 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 562 struct termios t; 563 564 tp->t_dev = dev; 565 566 /* Call the power management hook. */ 567 if (cs->enable) { 568 if ((*cs->enable)(cs)) { 569 mutex_spin_exit(&tty_lock); 570 printf("%s: device enable failed\n", 571 device_xname(zst->zst_dev)); 572 return (EIO); 573 } 574 } 575 576 /* 577 * Initialize the termios status to the defaults. Add in the 578 * sticky bits from TIOCSFLAGS. 579 */ 580 t.c_ispeed = 0; 581 t.c_ospeed = cs->cs_defspeed; 582 t.c_cflag = cs->cs_defcflag; 583 if (ISSET(zst->zst_swflags, TIOCFLAG_CLOCAL)) 584 SET(t.c_cflag, CLOCAL); 585 if (ISSET(zst->zst_swflags, TIOCFLAG_CRTSCTS)) 586 SET(t.c_cflag, CRTSCTS); 587 if (ISSET(zst->zst_swflags, TIOCFLAG_CDTRCTS)) 588 SET(t.c_cflag, CDTRCTS); 589 if (ISSET(zst->zst_swflags, TIOCFLAG_MDMBUF)) 590 SET(t.c_cflag, MDMBUF); 591 592 mutex_spin_enter(&cs->cs_lock); 593 594 /* 595 * Turn on receiver and status interrupts. 596 * We defer the actual write of the register to zsparam(), 597 * but we must make sure status interrupts are turned on by 598 * the time zsparam() reads the initial rr0 state. 599 */ 600 SET(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_SIE); 601 602 /* Clear PPS capture state on first open. */ 603 mutex_spin_enter(&timecounter_lock); 604 zst->zst_ppsmask = 0; 605 memset(&zst->zst_pps_state, 0, sizeof(zst->zst_pps_state)); 606 zst->zst_pps_state.ppscap = 607 PPS_CAPTUREASSERT | PPS_CAPTURECLEAR; 608 pps_init(&zst->zst_pps_state); 609 mutex_spin_exit(&timecounter_lock); 610 611 mutex_spin_exit(&cs->cs_lock); 612 613 /* Make sure zsparam will see changes. */ 614 tp->t_ospeed = 0; 615 (void) zsparam(tp, &t); 616 617 /* 618 * Note: zsparam has done: cflag, ispeed, ospeed 619 * so we just need to do: iflag, oflag, lflag, cc 620 * For "raw" mode, just leave all zeros. 621 */ 622 if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_RAW)) { 623 tp->t_iflag = TTYDEF_IFLAG; 624 tp->t_oflag = TTYDEF_OFLAG; 625 tp->t_lflag = TTYDEF_LFLAG; 626 } else { 627 tp->t_iflag = 0; 628 tp->t_oflag = 0; 629 tp->t_lflag = 0; 630 } 631 ttychars(tp); 632 ttsetwater(tp); 633 634 mutex_spin_enter(&cs->cs_lock); 635 636 /* 637 * Turn on DTR. We must always do this, even if carrier is not 638 * present, because otherwise we'd have to use TIOCSDTR 639 * immediately after setting CLOCAL, which applications do not 640 * expect. We always assert DTR while the device is open 641 * unless explicitly requested to deassert it. 642 */ 643 zs_modem(zst, 1); 644 645 /* Clear the input ring, and unblock. */ 646 zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf; 647 zst->zst_rbavail = zstty_rbuf_size; 648 zs_iflush(cs); 649 CLR(zst->zst_rx_flags, RX_ANY_BLOCK); 650 zs_hwiflow(zst); 651 652 mutex_spin_exit(&cs->cs_lock); 653 } 654 655 mutex_spin_exit(&tty_lock); 656 657 error = ttyopen(tp, ZSDIALOUT(dev), ISSET(flags, O_NONBLOCK)); 658 if (error) 659 goto bad; 660 661 error = (*tp->t_linesw->l_open)(dev, tp); 662 if (error) 663 goto bad; 664 665 return (0); 666 667 bad: 668 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 669 /* 670 * We failed to open the device, and nobody else had it opened. 671 * Clean up the state as appropriate. 672 */ 673 zs_shutdown(zst); 674 } 675 676 return (error); 677 } 678 679 /* 680 * Close a zs serial port. 681 */ 682 int 683 zsclose(dev_t dev, int flags, int mode, struct lwp *l) 684 { 685 struct zstty_softc *zst; 686 struct tty *tp; 687 688 zst = device_lookup_private(&zstty_cd, ZSUNIT(dev)); 689 tp = zst->zst_tty; 690 691 /* XXX This is for cons.c. */ 692 if (!ISSET(tp->t_state, TS_ISOPEN)) 693 return 0; 694 695 (*tp->t_linesw->l_close)(tp, flags); 696 ttyclose(tp); 697 698 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 699 /* 700 * Although we got a last close, the device may still be in 701 * use; e.g. if this was the dialout node, and there are still 702 * processes waiting for carrier on the non-dialout node. 703 */ 704 zs_shutdown(zst); 705 } 706 707 return (0); 708 } 709 710 /* 711 * Read/write zs serial port. 712 */ 713 int 714 zsread(dev_t dev, struct uio *uio, int flags) 715 { 716 struct zstty_softc *zst; 717 struct tty *tp; 718 719 zst = device_lookup_private(&zstty_cd, ZSUNIT(dev)); 720 tp = zst->zst_tty; 721 722 return ((*tp->t_linesw->l_read)(tp, uio, flags)); 723 } 724 725 int 726 zswrite(dev_t dev, struct uio *uio, int flags) 727 { 728 struct zstty_softc *zst; 729 struct tty *tp; 730 731 zst = device_lookup_private(&zstty_cd, ZSUNIT(dev)); 732 tp = zst->zst_tty; 733 734 return ((*tp->t_linesw->l_write)(tp, uio, flags)); 735 } 736 737 int 738 zspoll(dev_t dev, int events, struct lwp *l) 739 { 740 struct zstty_softc *zst; 741 struct tty *tp; 742 743 zst = device_lookup_private(&zstty_cd, ZSUNIT(dev)); 744 tp = zst->zst_tty; 745 746 return ((*tp->t_linesw->l_poll)(tp, events, l)); 747 } 748 749 int 750 zsioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 751 { 752 struct zstty_softc *zst; 753 struct zs_chanstate *cs; 754 struct tty *tp; 755 int error; 756 757 zst = device_lookup_private(&zstty_cd, ZSUNIT(dev)); 758 cs = zst->zst_cs; 759 tp = zst->zst_tty; 760 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 761 if (error != EPASSTHROUGH) 762 return (error); 763 764 error = ttioctl(tp, cmd, data, flag, l); 765 if (error != EPASSTHROUGH) 766 return (error); 767 768 #ifdef ZS_MD_IOCTL 769 error = ZS_MD_IOCTL(cs, cmd, data); 770 if (error != EPASSTHROUGH) 771 return (error); 772 #endif /* ZS_MD_IOCTL */ 773 774 error = 0; 775 776 mutex_spin_enter(&cs->cs_lock); 777 778 switch (cmd) { 779 case TIOCSBRK: 780 zs_break(cs, 1); 781 break; 782 783 case TIOCCBRK: 784 zs_break(cs, 0); 785 break; 786 787 case TIOCGFLAGS: 788 *(int *)data = zst->zst_swflags; 789 break; 790 791 case TIOCSFLAGS: 792 error = kauth_authorize_device_tty(l->l_cred, 793 KAUTH_DEVICE_TTY_PRIVSET, tp); 794 if (error) 795 break; 796 zst->zst_swflags = *(int *)data; 797 break; 798 799 case TIOCSDTR: 800 zs_modem(zst, 1); 801 break; 802 803 case TIOCCDTR: 804 zs_modem(zst, 0); 805 break; 806 807 case TIOCMSET: 808 case TIOCMBIS: 809 case TIOCMBIC: 810 tiocm_to_zs(zst, cmd, *(int *)data); 811 break; 812 813 case TIOCMGET: 814 *(int *)data = zs_to_tiocm(zst); 815 break; 816 817 case PPS_IOC_CREATE: 818 case PPS_IOC_DESTROY: 819 case PPS_IOC_GETPARAMS: 820 case PPS_IOC_SETPARAMS: 821 case PPS_IOC_GETCAP: 822 case PPS_IOC_FETCH: 823 #ifdef PPS_SYNC 824 case PPS_IOC_KCBIND: 825 #endif 826 mutex_spin_enter(&timecounter_lock); 827 error = pps_ioctl(cmd, data, &zst->zst_pps_state); 828 if (zst->zst_pps_state.ppsparam.mode & PPS_CAPTUREBOTH) 829 zst->zst_ppsmask = ZSRR0_DCD; 830 else 831 zst->zst_ppsmask = 0; 832 mutex_spin_exit(&timecounter_lock); 833 break; 834 835 case TIOCDCDTIMESTAMP: /* XXX old, overloaded API used by xntpd v3 */ 836 if (cs->cs_rr0_pps == 0) { 837 error = EINVAL; 838 break; 839 } 840 mutex_spin_enter(&timecounter_lock); 841 #ifndef PPS_TRAILING_EDGE 842 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 843 &zst->zst_pps_state.ppsinfo.assert_timestamp); 844 #else 845 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 846 &zst->zst_pps_state.ppsinfo.clear_timestamp); 847 #endif 848 mutex_spin_exit(&timecounter_lock); 849 /* 850 * Now update interrupts. 851 */ 852 zs_maskintr(zst); 853 /* 854 * If nothing is being transmitted, set up new current values, 855 * else mark them as pending. 856 */ 857 if (!cs->cs_heldchange) { 858 if (zst->zst_tx_busy) { 859 zst->zst_heldtbc = zst->zst_tbc; 860 zst->zst_tbc = 0; 861 cs->cs_heldchange = 1; 862 } else 863 zs_loadchannelregs(cs); 864 } 865 866 break; 867 868 default: 869 error = EPASSTHROUGH; 870 break; 871 } 872 873 mutex_spin_exit(&cs->cs_lock); 874 875 return (error); 876 } 877 878 /* 879 * Start or restart transmission. 880 */ 881 static void 882 zsstart(struct tty *tp) 883 { 884 struct zstty_softc *zst; 885 struct zs_chanstate *cs; 886 u_char *tba; 887 int tbc; 888 889 zst = device_lookup_private(&zstty_cd, ZSUNIT(tp->t_dev)); 890 cs = zst->zst_cs; 891 892 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 893 return; 894 if (zst->zst_tx_stopped) 895 return; 896 if (!ttypull(tp)) 897 return; 898 899 /* Grab the first contiguous region of buffer space. */ 900 tba = tp->t_outq.c_cf; 901 tbc = ndqb(&tp->t_outq, 0); 902 903 mutex_spin_enter(&cs->cs_lock); 904 905 zst->zst_tba = tba; 906 zst->zst_tbc = tbc; 907 SET(tp->t_state, TS_BUSY); 908 zst->zst_tx_busy = 1; 909 910 #ifdef ZS_TXDMA 911 if (zst->zst_tbc > 1) { 912 zs_dma_setup(cs, zst->zst_tba, zst->zst_tbc); 913 mutex_spin_exit(&cs->cs_lock); 914 return; 915 } 916 #endif 917 918 /* Enable transmit completion interrupts if necessary. */ 919 if (!ISSET(cs->cs_preg[1], ZSWR1_TIE)) { 920 SET(cs->cs_preg[1], ZSWR1_TIE); 921 cs->cs_creg[1] = cs->cs_preg[1]; 922 zs_write_reg(cs, 1, cs->cs_creg[1]); 923 } 924 925 /* Output the first character of the contiguous buffer. */ 926 zs_write_data(cs, *zst->zst_tba); 927 zst->zst_tbc--; 928 zst->zst_tba++; 929 930 mutex_spin_exit(&cs->cs_lock); 931 } 932 933 /* 934 * Stop output, e.g., for ^S or output flush. 935 */ 936 void 937 zsstop(struct tty *tp, int flag) 938 { 939 struct zstty_softc *zst; 940 941 zst = device_lookup_private(&zstty_cd, ZSUNIT(tp->t_dev)); 942 943 mutex_spin_enter(&zst->zst_cs->cs_lock); 944 if (ISSET(tp->t_state, TS_BUSY)) { 945 /* Stop transmitting at the next chunk. */ 946 zst->zst_tbc = 0; 947 zst->zst_heldtbc = 0; 948 if (!ISSET(tp->t_state, TS_TTSTOP)) 949 SET(tp->t_state, TS_FLUSH); 950 } 951 mutex_spin_exit(&zst->zst_cs->cs_lock); 952 } 953 954 /* 955 * Set ZS tty parameters from termios. 956 * XXX - Should just copy the whole termios after 957 * making sure all the changes could be done. 958 */ 959 static int 960 zsparam(struct tty *tp, struct termios *t) 961 { 962 struct zstty_softc *zst; 963 struct zs_chanstate *cs; 964 int ospeed; 965 tcflag_t cflag; 966 uint8_t tmp3, tmp4, tmp5; 967 int error; 968 969 zst = device_lookup_private(&zstty_cd, ZSUNIT(tp->t_dev)); 970 cs = zst->zst_cs; 971 ospeed = t->c_ospeed; 972 cflag = t->c_cflag; 973 974 /* Check requested parameters. */ 975 if (ospeed < 0) 976 return (EINVAL); 977 if (t->c_ispeed && t->c_ispeed != ospeed) 978 return (EINVAL); 979 980 /* 981 * For the console, always force CLOCAL and !HUPCL, so that the port 982 * is always active. 983 */ 984 if (ISSET(zst->zst_swflags, TIOCFLAG_SOFTCAR) || 985 ISSET(zst->zst_hwflags, ZS_HWFLAG_CONSOLE)) { 986 SET(cflag, CLOCAL); 987 CLR(cflag, HUPCL); 988 } 989 990 /* 991 * Only whack the UART when params change. 992 * Some callers need to clear tp->t_ospeed 993 * to make sure initialization gets done. 994 */ 995 if (tp->t_ospeed == ospeed && 996 tp->t_cflag == cflag) 997 return (0); 998 999 /* 1000 * Call MD functions to deal with changed 1001 * clock modes or H/W flow control modes. 1002 * The BRG divisor is set now. (reg 12,13) 1003 */ 1004 error = zs_set_speed(cs, ospeed); 1005 if (error) 1006 return (error); 1007 error = zs_set_modes(cs, cflag); 1008 if (error) 1009 return (error); 1010 1011 /* 1012 * Block interrupts so that state will not 1013 * be altered until we are done setting it up. 1014 * 1015 * Initial values in cs_preg are set before 1016 * our attach routine is called. The master 1017 * interrupt enable is handled by zsc.c 1018 * 1019 */ 1020 mutex_spin_enter(&cs->cs_lock); 1021 1022 /* 1023 * Recalculate which status ints to enable. 1024 */ 1025 zs_maskintr(zst); 1026 1027 /* Recompute character size bits. */ 1028 tmp3 = cs->cs_preg[3]; 1029 tmp5 = cs->cs_preg[5]; 1030 CLR(tmp3, ZSWR3_RXSIZE); 1031 CLR(tmp5, ZSWR5_TXSIZE); 1032 switch (ISSET(cflag, CSIZE)) { 1033 case CS5: 1034 SET(tmp3, ZSWR3_RX_5); 1035 SET(tmp5, ZSWR5_TX_5); 1036 break; 1037 case CS6: 1038 SET(tmp3, ZSWR3_RX_6); 1039 SET(tmp5, ZSWR5_TX_6); 1040 break; 1041 case CS7: 1042 SET(tmp3, ZSWR3_RX_7); 1043 SET(tmp5, ZSWR5_TX_7); 1044 break; 1045 case CS8: 1046 SET(tmp3, ZSWR3_RX_8); 1047 SET(tmp5, ZSWR5_TX_8); 1048 break; 1049 } 1050 cs->cs_preg[3] = tmp3; 1051 cs->cs_preg[5] = tmp5; 1052 1053 /* 1054 * Recompute the stop bits and parity bits. Note that 1055 * zs_set_speed() may have set clock selection bits etc. 1056 * in wr4, so those must preserved. 1057 */ 1058 tmp4 = cs->cs_preg[4]; 1059 CLR(tmp4, ZSWR4_SBMASK | ZSWR4_PARMASK); 1060 if (ISSET(cflag, CSTOPB)) 1061 SET(tmp4, ZSWR4_TWOSB); 1062 else 1063 SET(tmp4, ZSWR4_ONESB); 1064 if (!ISSET(cflag, PARODD)) 1065 SET(tmp4, ZSWR4_EVENP); 1066 if (ISSET(cflag, PARENB)) 1067 SET(tmp4, ZSWR4_PARENB); 1068 cs->cs_preg[4] = tmp4; 1069 1070 /* And copy to tty. */ 1071 tp->t_ispeed = 0; 1072 tp->t_ospeed = ospeed; 1073 tp->t_cflag = cflag; 1074 1075 /* 1076 * If nothing is being transmitted, set up new current values, 1077 * else mark them as pending. 1078 */ 1079 if (!cs->cs_heldchange) { 1080 if (zst->zst_tx_busy) { 1081 zst->zst_heldtbc = zst->zst_tbc; 1082 zst->zst_tbc = 0; 1083 cs->cs_heldchange = 1; 1084 } else 1085 zs_loadchannelregs(cs); 1086 } 1087 1088 /* 1089 * If hardware flow control is disabled, turn off the buffer water 1090 * marks and unblock any soft flow control state. Otherwise, enable 1091 * the water marks. 1092 */ 1093 if (!ISSET(cflag, CHWFLOW)) { 1094 zst->zst_r_hiwat = 0; 1095 zst->zst_r_lowat = 0; 1096 if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1097 CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1098 zst->zst_rx_ready = 1; 1099 cs->cs_softreq = 1; 1100 } 1101 if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 1102 CLR(zst->zst_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 1103 zs_hwiflow(zst); 1104 } 1105 } else { 1106 zst->zst_r_hiwat = zstty_rbuf_hiwat; 1107 zst->zst_r_lowat = zstty_rbuf_lowat; 1108 } 1109 1110 /* 1111 * Force a recheck of the hardware carrier and flow control status, 1112 * since we may have changed which bits we're looking at. 1113 */ 1114 zstty_stint(cs, 1); 1115 1116 mutex_spin_exit(&cs->cs_lock); 1117 1118 /* 1119 * If hardware flow control is disabled, unblock any hard flow control 1120 * state. 1121 */ 1122 if (!ISSET(cflag, CHWFLOW)) { 1123 if (zst->zst_tx_stopped) { 1124 zst->zst_tx_stopped = 0; 1125 zsstart(tp); 1126 } 1127 } 1128 1129 zstty_softint1(cs); 1130 1131 return (0); 1132 } 1133 1134 /* 1135 * Compute interrupt enable bits and set in the pending bits. Called both 1136 * in zsparam() and when PPS (pulse per second timing) state changes. 1137 * Must be called at splzs(). 1138 */ 1139 static void 1140 zs_maskintr(struct zstty_softc *zst) 1141 { 1142 struct zs_chanstate *cs = zst->zst_cs; 1143 uint8_t tmp15; 1144 1145 cs->cs_rr0_mask = cs->cs_rr0_cts | cs->cs_rr0_dcd; 1146 if (zst->zst_ppsmask != 0) 1147 cs->cs_rr0_mask |= cs->cs_rr0_pps; 1148 tmp15 = cs->cs_preg[15]; 1149 if (ISSET(cs->cs_rr0_mask, ZSRR0_DCD)) 1150 SET(tmp15, ZSWR15_DCD_IE); 1151 else 1152 CLR(tmp15, ZSWR15_DCD_IE); 1153 if (ISSET(cs->cs_rr0_mask, ZSRR0_CTS)) 1154 SET(tmp15, ZSWR15_CTS_IE); 1155 else 1156 CLR(tmp15, ZSWR15_CTS_IE); 1157 cs->cs_preg[15] = tmp15; 1158 } 1159 1160 1161 /* 1162 * Raise or lower modem control (DTR/RTS) signals. If a character is 1163 * in transmission, the change is deferred. 1164 * Called at splzs() and with the channel lock held. 1165 */ 1166 static void 1167 zs_modem(struct zstty_softc *zst, int onoff) 1168 { 1169 struct zs_chanstate *cs = zst->zst_cs, *ccs; 1170 1171 if (cs->cs_wr5_dtr == 0) 1172 return; 1173 1174 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs); 1175 1176 if (onoff) 1177 SET(ccs->cs_preg[5], cs->cs_wr5_dtr); 1178 else 1179 CLR(ccs->cs_preg[5], cs->cs_wr5_dtr); 1180 1181 if (!cs->cs_heldchange) { 1182 if (zst->zst_tx_busy) { 1183 zst->zst_heldtbc = zst->zst_tbc; 1184 zst->zst_tbc = 0; 1185 cs->cs_heldchange = 1; 1186 } else 1187 zs_loadchannelregs(cs); 1188 } 1189 } 1190 1191 /* 1192 * Set modem bits. 1193 * Called at splzs() and with the channel lock held. 1194 */ 1195 static void 1196 tiocm_to_zs(struct zstty_softc *zst, u_long how, int ttybits) 1197 { 1198 struct zs_chanstate *cs = zst->zst_cs, *ccs; 1199 uint8_t zsbits; 1200 1201 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs); 1202 1203 zsbits = 0; 1204 if (ISSET(ttybits, TIOCM_DTR)) 1205 SET(zsbits, ZSWR5_DTR); 1206 if (ISSET(ttybits, TIOCM_RTS)) 1207 SET(zsbits, ZSWR5_RTS); 1208 1209 switch (how) { 1210 case TIOCMBIC: 1211 CLR(ccs->cs_preg[5], zsbits); 1212 break; 1213 1214 case TIOCMBIS: 1215 SET(ccs->cs_preg[5], zsbits); 1216 break; 1217 1218 case TIOCMSET: 1219 CLR(ccs->cs_preg[5], ZSWR5_RTS | ZSWR5_DTR); 1220 SET(ccs->cs_preg[5], zsbits); 1221 break; 1222 } 1223 1224 if (!cs->cs_heldchange) { 1225 if (zst->zst_tx_busy) { 1226 zst->zst_heldtbc = zst->zst_tbc; 1227 zst->zst_tbc = 0; 1228 cs->cs_heldchange = 1; 1229 } else 1230 zs_loadchannelregs(cs); 1231 } 1232 } 1233 1234 /* 1235 * Get modem bits. 1236 * Called at splzs() and with the channel lock held. 1237 */ 1238 static int 1239 zs_to_tiocm(struct zstty_softc *zst) 1240 { 1241 struct zs_chanstate *cs = zst->zst_cs, *ccs; 1242 uint8_t zsbits; 1243 int ttybits = 0; 1244 1245 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs); 1246 1247 zsbits = ccs->cs_preg[5]; 1248 if (ISSET(zsbits, ZSWR5_DTR)) 1249 SET(ttybits, TIOCM_DTR); 1250 if (ISSET(zsbits, ZSWR5_RTS)) 1251 SET(ttybits, TIOCM_RTS); 1252 1253 zsbits = cs->cs_rr0; 1254 if (ISSET(zsbits, ZSRR0_DCD)) 1255 SET(ttybits, TIOCM_CD); 1256 if (ISSET(zsbits, ZSRR0_CTS)) 1257 SET(ttybits, TIOCM_CTS); 1258 1259 return (ttybits); 1260 } 1261 1262 /* 1263 * Try to block or unblock input using hardware flow-control. 1264 * This is called by kern/tty.c if MDMBUF|CRTSCTS is set, and 1265 * if this function returns non-zero, the TS_TBLOCK flag will 1266 * be set or cleared according to the "block" arg passed. 1267 */ 1268 int 1269 zshwiflow(struct tty *tp, int block) 1270 { 1271 struct zstty_softc *zst; 1272 struct zs_chanstate *cs; 1273 1274 zst = device_lookup_private(&zstty_cd, ZSUNIT(tp->t_dev)); 1275 cs = zst->zst_cs; 1276 1277 if (cs->cs_wr5_rts == 0) 1278 return (0); 1279 1280 mutex_spin_enter(&cs->cs_lock); 1281 if (block) { 1282 if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1283 SET(zst->zst_rx_flags, RX_TTY_BLOCKED); 1284 zs_hwiflow(zst); 1285 } 1286 } else { 1287 if (ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1288 CLR(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1289 zst->zst_rx_ready = 1; 1290 cs->cs_softreq = 1; 1291 } 1292 if (ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1293 CLR(zst->zst_rx_flags, RX_TTY_BLOCKED); 1294 zs_hwiflow(zst); 1295 } 1296 } 1297 mutex_spin_exit(&cs->cs_lock); 1298 return (1); 1299 } 1300 1301 /* 1302 * Internal version of zshwiflow 1303 * Called at splzs() and with the channel lock held. 1304 */ 1305 static void 1306 zs_hwiflow(struct zstty_softc *zst) 1307 { 1308 struct zs_chanstate *cs = zst->zst_cs, *ccs; 1309 1310 if (cs->cs_wr5_rts == 0) 1311 return; 1312 1313 ccs = (cs->cs_ctl_chan != NULL ? cs->cs_ctl_chan : cs); 1314 1315 if (ISSET(zst->zst_rx_flags, RX_ANY_BLOCK)) { 1316 CLR(ccs->cs_preg[5], cs->cs_wr5_rts); 1317 CLR(ccs->cs_creg[5], cs->cs_wr5_rts); 1318 } else { 1319 SET(ccs->cs_preg[5], cs->cs_wr5_rts); 1320 SET(ccs->cs_creg[5], cs->cs_wr5_rts); 1321 } 1322 zs_write_reg(ccs, 5, ccs->cs_creg[5]); 1323 } 1324 1325 1326 /**************************************************************** 1327 * Interface to the lower layer (zscc) 1328 ****************************************************************/ 1329 1330 #define integrate static inline 1331 integrate void zstty_rxsoft(struct zstty_softc *, struct tty *); 1332 integrate void zstty_txsoft(struct zstty_softc *, struct tty *); 1333 integrate void zstty_stsoft(struct zstty_softc *, struct tty *); 1334 static void zstty_diag(void *); 1335 1336 /* 1337 * Receiver Ready interrupt. 1338 * Called at splzs() and with the channel lock held. 1339 */ 1340 static void 1341 zstty_rxint(struct zs_chanstate *cs) 1342 { 1343 struct zstty_softc *zst = cs->cs_private; 1344 uint8_t *put, *end; 1345 u_int cc; 1346 uint8_t rr0, rr1, c; 1347 1348 end = zst->zst_ebuf; 1349 put = zst->zst_rbput; 1350 cc = zst->zst_rbavail; 1351 1352 while (cc > 0) { 1353 /* 1354 * First read the status, because reading the received char 1355 * destroys the status of this char. 1356 */ 1357 rr1 = zs_read_reg(cs, 1); 1358 c = zs_read_data(cs); 1359 1360 if (ISSET(rr1, ZSRR1_FE | ZSRR1_DO | ZSRR1_PE)) { 1361 /* Clear the receive error. */ 1362 zs_write_csr(cs, ZSWR0_RESET_ERRORS); 1363 } 1364 1365 cn_check_magic(zst->zst_tty->t_dev, c, zstty_cnm_state); 1366 put[0] = c; 1367 put[1] = rr1; 1368 put += 2; 1369 if (put >= end) 1370 put = zst->zst_rbuf; 1371 cc--; 1372 1373 rr0 = zs_read_csr(cs); 1374 if (!ISSET(rr0, ZSRR0_RX_READY)) 1375 break; 1376 } 1377 1378 /* 1379 * Current string of incoming characters ended because 1380 * no more data was available or we ran out of space. 1381 * Schedule a receive event if any data was received. 1382 * If we're out of space, turn off receive interrupts. 1383 */ 1384 zst->zst_rbput = put; 1385 zst->zst_rbavail = cc; 1386 if (!ISSET(zst->zst_rx_flags, RX_TTY_OVERFLOWED)) { 1387 zst->zst_rx_ready = 1; 1388 cs->cs_softreq = 1; 1389 } 1390 1391 /* 1392 * See if we are in danger of overflowing a buffer. If 1393 * so, use hardware flow control to ease the pressure. 1394 */ 1395 if (!ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED) && 1396 cc < zst->zst_r_hiwat) { 1397 SET(zst->zst_rx_flags, RX_IBUF_BLOCKED); 1398 zs_hwiflow(zst); 1399 } 1400 1401 /* 1402 * If we're out of space, disable receive interrupts 1403 * until the queue has drained a bit. 1404 */ 1405 if (!cc) { 1406 SET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED); 1407 CLR(cs->cs_preg[1], ZSWR1_RIE); 1408 cs->cs_creg[1] = cs->cs_preg[1]; 1409 zs_write_reg(cs, 1, cs->cs_creg[1]); 1410 } 1411 1412 #if 0 1413 printf("%xH%04d\n", zst->zst_rx_flags, zst->zst_rbavail); 1414 #endif 1415 } 1416 1417 /* 1418 * Transmitter Ready interrupt. 1419 * Called at splzs() and with the channel lock held. 1420 */ 1421 static void 1422 zstty_txint(struct zs_chanstate *cs) 1423 { 1424 struct zstty_softc *zst = cs->cs_private; 1425 1426 /* 1427 * If we've delayed a parameter change, do it now, and restart 1428 * output. 1429 */ 1430 if (cs->cs_heldchange) { 1431 zs_loadchannelregs(cs); 1432 cs->cs_heldchange = 0; 1433 zst->zst_tbc = zst->zst_heldtbc; 1434 zst->zst_heldtbc = 0; 1435 } 1436 1437 /* Output the next character in the buffer, if any. */ 1438 if (zst->zst_tbc > 0) { 1439 zs_write_data(cs, *zst->zst_tba); 1440 zst->zst_tbc--; 1441 zst->zst_tba++; 1442 } else { 1443 /* Disable transmit completion interrupts if necessary. */ 1444 if (ISSET(cs->cs_preg[1], ZSWR1_TIE)) { 1445 CLR(cs->cs_preg[1], ZSWR1_TIE); 1446 cs->cs_creg[1] = cs->cs_preg[1]; 1447 zs_write_reg(cs, 1, cs->cs_creg[1]); 1448 } 1449 if (zst->zst_tx_busy) { 1450 zst->zst_tx_busy = 0; 1451 zst->zst_tx_done = 1; 1452 cs->cs_softreq = 1; 1453 } 1454 } 1455 } 1456 1457 /* 1458 * Status Change interrupt. 1459 * Called at splzs() and with the channel lock held. 1460 */ 1461 static void 1462 zstty_stint(struct zs_chanstate *cs, int force) 1463 { 1464 struct zstty_softc *zst = cs->cs_private; 1465 uint8_t rr0, delta; 1466 1467 rr0 = zs_read_csr(cs); 1468 zs_write_csr(cs, ZSWR0_RESET_STATUS); 1469 1470 /* 1471 * Check here for console break, so that we can abort 1472 * even when interrupts are locking up the machine. 1473 */ 1474 if (ISSET(rr0, ZSRR0_BREAK)) 1475 cn_check_magic(zst->zst_tty->t_dev, CNC_BREAK, zstty_cnm_state); 1476 1477 if (!force) 1478 delta = rr0 ^ cs->cs_rr0; 1479 else 1480 delta = cs->cs_rr0_mask; 1481 cs->cs_rr0 = rr0; 1482 1483 if (ISSET(delta, cs->cs_rr0_mask)) { 1484 SET(cs->cs_rr0_delta, delta); 1485 1486 /* 1487 * Pulse-per-second clock signal on edge of DCD? 1488 */ 1489 if (ISSET(delta, zst->zst_ppsmask)) { 1490 if (zst->zst_pps_state.ppsparam.mode & 1491 PPS_CAPTUREBOTH) { 1492 mutex_spin_enter(&timecounter_lock); 1493 pps_capture(&zst->zst_pps_state); 1494 pps_event(&zst->zst_pps_state, 1495 (ISSET(cs->cs_rr0, zst->zst_ppsmask)) 1496 ? PPS_CAPTUREASSERT 1497 : PPS_CAPTURECLEAR); 1498 mutex_spin_exit(&timecounter_lock); 1499 } 1500 } 1501 1502 /* 1503 * Stop output immediately if we lose the output 1504 * flow control signal or carrier detect. 1505 */ 1506 if (ISSET(~rr0, cs->cs_rr0_mask)) { 1507 zst->zst_tbc = 0; 1508 zst->zst_heldtbc = 0; 1509 } 1510 1511 zst->zst_st_check = 1; 1512 cs->cs_softreq = 1; 1513 } 1514 } 1515 1516 void 1517 zstty_diag(void *arg) 1518 { 1519 struct zstty_softc *zst = arg; 1520 int overflows, floods; 1521 1522 mutex_spin_enter(&zst->zst_cs->cs_lock); 1523 overflows = zst->zst_overflows; 1524 zst->zst_overflows = 0; 1525 floods = zst->zst_floods; 1526 zst->zst_floods = 0; 1527 zst->zst_errors = 0; 1528 mutex_spin_exit(&zst->zst_cs->cs_lock); 1529 1530 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1531 device_xname(zst->zst_dev), 1532 overflows, overflows == 1 ? "" : "s", 1533 floods, floods == 1 ? "" : "s"); 1534 } 1535 1536 integrate void 1537 zstty_rxsoft(struct zstty_softc *zst, struct tty *tp) 1538 { 1539 struct zs_chanstate *cs = zst->zst_cs; 1540 int (*rint)(int, struct tty *) = tp->t_linesw->l_rint; 1541 uint8_t *get, *end; 1542 u_int cc, scc; 1543 uint8_t rr1; 1544 int code; 1545 1546 end = zst->zst_ebuf; 1547 get = zst->zst_rbget; 1548 scc = cc = zstty_rbuf_size - zst->zst_rbavail; 1549 1550 if (cc == zstty_rbuf_size) { 1551 zst->zst_floods++; 1552 if (zst->zst_errors++ == 0) 1553 callout_reset(&zst->zst_diag_ch, 60 * hz, 1554 zstty_diag, zst); 1555 } 1556 1557 /* If not yet open, drop the entire buffer content here */ 1558 if (!ISSET(tp->t_state, TS_ISOPEN)) { 1559 get += cc << 1; 1560 if (get >= end) 1561 get -= zstty_rbuf_size << 1; 1562 cc = 0; 1563 } 1564 while (cc) { 1565 code = get[0]; 1566 rr1 = get[1]; 1567 if (ISSET(rr1, ZSRR1_DO | ZSRR1_FE | ZSRR1_PE)) { 1568 if (ISSET(rr1, ZSRR1_DO)) { 1569 zst->zst_overflows++; 1570 if (zst->zst_errors++ == 0) 1571 callout_reset(&zst->zst_diag_ch, 1572 60 * hz, zstty_diag, zst); 1573 } 1574 if (ISSET(rr1, ZSRR1_FE)) 1575 SET(code, TTY_FE); 1576 if (ISSET(rr1, ZSRR1_PE)) 1577 SET(code, TTY_PE); 1578 } 1579 if ((*rint)(code, tp) == -1) { 1580 /* 1581 * The line discipline's buffer is out of space. 1582 */ 1583 if (!ISSET(zst->zst_rx_flags, RX_TTY_BLOCKED)) { 1584 /* 1585 * We're either not using flow control, or the 1586 * line discipline didn't tell us to block for 1587 * some reason. Either way, we have no way to 1588 * know when there's more space available, so 1589 * just drop the rest of the data. 1590 */ 1591 get += cc << 1; 1592 if (get >= end) 1593 get -= zstty_rbuf_size << 1; 1594 cc = 0; 1595 } else { 1596 /* 1597 * Don't schedule any more receive processing 1598 * until the line discipline tells us there's 1599 * space available (through comhwiflow()). 1600 * Leave the rest of the data in the input 1601 * buffer. 1602 */ 1603 SET(zst->zst_rx_flags, RX_TTY_OVERFLOWED); 1604 } 1605 break; 1606 } 1607 get += 2; 1608 if (get >= end) 1609 get = zst->zst_rbuf; 1610 cc--; 1611 } 1612 1613 if (cc != scc) { 1614 zst->zst_rbget = get; 1615 mutex_spin_enter(&cs->cs_lock); 1616 cc = zst->zst_rbavail += scc - cc; 1617 /* Buffers should be ok again, release possible block. */ 1618 if (cc >= zst->zst_r_lowat) { 1619 if (ISSET(zst->zst_rx_flags, RX_IBUF_OVERFLOWED)) { 1620 CLR(zst->zst_rx_flags, RX_IBUF_OVERFLOWED); 1621 SET(cs->cs_preg[1], ZSWR1_RIE); 1622 cs->cs_creg[1] = cs->cs_preg[1]; 1623 zs_write_reg(cs, 1, cs->cs_creg[1]); 1624 } 1625 if (ISSET(zst->zst_rx_flags, RX_IBUF_BLOCKED)) { 1626 CLR(zst->zst_rx_flags, RX_IBUF_BLOCKED); 1627 zs_hwiflow(zst); 1628 } 1629 } 1630 mutex_spin_exit(&cs->cs_lock); 1631 } 1632 1633 #if 0 1634 printf("%xS%04d\n", zst->zst_rx_flags, zst->zst_rbavail); 1635 #endif 1636 } 1637 1638 integrate void 1639 zstty_txsoft(struct zstty_softc *zst, struct tty *tp) 1640 { 1641 struct zs_chanstate *cs = zst->zst_cs; 1642 1643 mutex_spin_enter(&cs->cs_lock); 1644 CLR(tp->t_state, TS_BUSY); 1645 if (ISSET(tp->t_state, TS_FLUSH)) 1646 CLR(tp->t_state, TS_FLUSH); 1647 else 1648 ndflush(&tp->t_outq, (int)(zst->zst_tba - tp->t_outq.c_cf)); 1649 mutex_spin_exit(&cs->cs_lock); 1650 (*tp->t_linesw->l_start)(tp); 1651 } 1652 1653 integrate void 1654 zstty_stsoft(struct zstty_softc *zst, struct tty *tp) 1655 { 1656 struct zs_chanstate *cs = zst->zst_cs; 1657 uint8_t rr0, delta; 1658 1659 mutex_spin_enter(&cs->cs_lock); 1660 rr0 = cs->cs_rr0; 1661 delta = cs->cs_rr0_delta; 1662 cs->cs_rr0_delta = 0; 1663 mutex_spin_exit(&cs->cs_lock); 1664 1665 if (ISSET(delta, cs->cs_rr0_dcd)) { 1666 /* 1667 * Inform the tty layer that carrier detect changed. 1668 */ 1669 mutex_spin_exit(&tty_lock); 1670 (void) (*tp->t_linesw->l_modem)(tp, ISSET(rr0, ZSRR0_DCD)); 1671 mutex_spin_enter(&tty_lock); 1672 } 1673 1674 if (ISSET(delta, cs->cs_rr0_cts)) { 1675 /* Block or unblock output according to flow control. */ 1676 if (ISSET(rr0, cs->cs_rr0_cts)) { 1677 zst->zst_tx_stopped = 0; 1678 (*tp->t_linesw->l_start)(tp); 1679 } else { 1680 zst->zst_tx_stopped = 1; 1681 } 1682 } 1683 } 1684 1685 /* 1686 * Software interrupt. Called at zssoft 1687 * 1688 * The main job to be done here is to empty the input ring 1689 * by passing its contents up to the tty layer. The ring is 1690 * always emptied during this operation, therefore the ring 1691 * must not be larger than the space after "high water" in 1692 * the tty layer, or the tty layer might drop our input. 1693 * 1694 * Note: an "input blockage" condition is assumed to exist if 1695 * EITHER the TS_TBLOCK flag or zst_rx_blocked flag is set. 1696 */ 1697 static void 1698 zstty_softint(struct zs_chanstate *cs) 1699 { 1700 1701 zstty_softint1(cs); 1702 } 1703 1704 static void 1705 zstty_softint1(struct zs_chanstate *cs) 1706 { 1707 struct zstty_softc *zst = cs->cs_private; 1708 struct tty *tp = zst->zst_tty; 1709 1710 1711 if (zst->zst_rx_ready) { 1712 zst->zst_rx_ready = 0; 1713 zstty_rxsoft(zst, tp); 1714 } 1715 1716 if (zst->zst_st_check) { 1717 zst->zst_st_check = 0; 1718 zstty_stsoft(zst, tp); 1719 } 1720 1721 if (zst->zst_tx_done) { 1722 zst->zst_tx_done = 0; 1723 zstty_txsoft(zst, tp); 1724 } 1725 } 1726 1727 struct zsops zsops_tty = { 1728 zstty_rxint, /* receive char available */ 1729 zstty_stint, /* external/status */ 1730 zstty_txint, /* xmit buffer empty */ 1731 zstty_softint, /* process software interrupt */ 1732 }; 1733 1734 #ifdef ZS_TXDMA 1735 void 1736 zstty_txdma_int(void *arg) 1737 { 1738 struct zs_chanstate *cs = arg; 1739 struct zstty_softc *zst = cs->cs_private; 1740 1741 zst->zst_tba += zst->zst_tbc; 1742 zst->zst_tbc = 0; 1743 1744 if (zst->zst_tx_busy) { 1745 zst->zst_tx_busy = 0; 1746 zst->zst_tx_done = 1; 1747 cs->cs_softreq = 1; 1748 } 1749 } 1750 #endif
Cache object: c90be0c5efc6745524c0da860d7ca809
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