com.c revision 1.153
1 /* $NetBSD: com.c,v 1.153 1999/02/03 23:57:27 mycroft Exp $ */ 2 3 /*- 4 * Copyright (c) 1998, 1999 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Charles M. Hannum. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * Copyright (c) 1991 The Regents of the University of California. 41 * All rights reserved. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 3. All advertising materials mentioning features or use of this software 52 * must display the following acknowledgement: 53 * This product includes software developed by the University of 54 * California, Berkeley and its contributors. 55 * 4. Neither the name of the University nor the names of its contributors 56 * may be used to endorse or promote products derived from this software 57 * without specific prior written permission. 58 * 59 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 60 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 61 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 62 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 63 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 64 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 65 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 66 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 67 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 68 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 69 * SUCH DAMAGE. 70 * 71 * @(#)com.c 7.5 (Berkeley) 5/16/91 72 */ 73 74 /* 75 * COM driver, uses National Semiconductor NS16450/NS16550AF UART 76 * Supports automatic hardware flow control on StarTech ST16C650A UART 77 */ 78 79 #include "opt_ddb.h" 80 81 #include "rnd.h" 82 #if NRND > 0 && defined(RND_COM) 83 #include <sys/rnd.h> 84 #endif 85 86 #include <sys/param.h> 87 #include <sys/systm.h> 88 #include <sys/ioctl.h> 89 #include <sys/select.h> 90 #include <sys/tty.h> 91 #include <sys/proc.h> 92 #include <sys/user.h> 93 #include <sys/conf.h> 94 #include <sys/file.h> 95 #include <sys/uio.h> 96 #include <sys/kernel.h> 97 #include <sys/syslog.h> 98 #include <sys/types.h> 99 #include <sys/device.h> 100 #include <sys/malloc.h> 101 #include <sys/timepps.h> 102 #include <sys/vnode.h> 103 104 #include <machine/intr.h> 105 #include <machine/bus.h> 106 107 #include <dev/ic/comreg.h> 108 #include <dev/ic/comvar.h> 109 #include <dev/ic/ns16550reg.h> 110 #include <dev/ic/st16650reg.h> 111 #ifdef COM_HAYESP 112 #include <dev/ic/hayespreg.h> 113 #endif 114 #define com_lcr com_cfcr 115 #include <dev/cons.h> 116 117 #include "com.h" 118 119 #ifdef COM_HAYESP 120 int comprobeHAYESP __P((bus_space_handle_t hayespioh, struct com_softc *sc)); 121 #endif 122 123 #if defined(DDB) || defined(KGDB) 124 static void com_enable_debugport __P((struct com_softc *)); 125 #endif 126 void com_attach_subr __P((struct com_softc *sc)); 127 void com_config __P((struct com_softc *)); 128 void com_shutdown __P((struct com_softc *)); 129 int comspeed __P((long, long)); 130 static u_char cflag2lcr __P((tcflag_t)); 131 int comparam __P((struct tty *, struct termios *)); 132 void comstart __P((struct tty *)); 133 void comstop __P((struct tty *, int)); 134 int comhwiflow __P((struct tty *, int)); 135 136 void com_loadchannelregs __P((struct com_softc *)); 137 void com_hwiflow __P((struct com_softc *)); 138 void com_break __P((struct com_softc *, int)); 139 void com_modem __P((struct com_softc *, int)); 140 void tiocm_to_com __P((struct com_softc *, int, int)); 141 int com_to_tiocm __P((struct com_softc *)); 142 void com_iflush __P((struct com_softc *)); 143 144 int com_common_getc __P((bus_space_tag_t, bus_space_handle_t)); 145 void com_common_putc __P((bus_space_tag_t, bus_space_handle_t, int)); 146 147 /* XXX: These belong elsewhere */ 148 cdev_decl(com); 149 bdev_decl(com); 150 151 int comcngetc __P((dev_t)); 152 void comcnputc __P((dev_t, int)); 153 void comcnpollc __P((dev_t, int)); 154 155 #define integrate static inline 156 #ifdef __GENERIC_SOFT_INTERRUPTS 157 void comsoft __P((void *)); 158 #else 159 #ifndef __NO_SOFT_SERIAL_INTERRUPT 160 void comsoft __P((void)); 161 #else 162 void comsoft __P((void *)); 163 #endif 164 #endif 165 integrate void com_rxsoft __P((struct com_softc *, struct tty *)); 166 integrate void com_txsoft __P((struct com_softc *, struct tty *)); 167 integrate void com_stsoft __P((struct com_softc *, struct tty *)); 168 integrate void com_schedrx __P((struct com_softc *)); 169 void comdiag __P((void *)); 170 171 extern struct cfdriver com_cd; 172 173 /* 174 * Make this an option variable one can patch. 175 * But be warned: this must be a power of 2! 176 */ 177 u_int com_rbuf_size = COM_RING_SIZE; 178 179 /* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */ 180 u_int com_rbuf_hiwat = (COM_RING_SIZE * 1) / 4; 181 u_int com_rbuf_lowat = (COM_RING_SIZE * 3) / 4; 182 183 static int comconsaddr; 184 static bus_space_tag_t comconstag; 185 static bus_space_handle_t comconsioh; 186 static int comconsattached; 187 static int comconsrate; 188 static tcflag_t comconscflag; 189 190 static int ppscap = 191 PPS_TSFMT_TSPEC | 192 PPS_CAPTUREASSERT | 193 PPS_CAPTURECLEAR | 194 #ifdef PPS_SYNC 195 PPS_HARDPPSONASSERT | PPS_HARDPPSONCLEAR | 196 #endif /* PPS_SYNC */ 197 PPS_OFFSETASSERT | PPS_OFFSETCLEAR; 198 199 #ifndef __GENERIC_SOFT_INTERRUPTS 200 #ifdef __NO_SOFT_SERIAL_INTERRUPT 201 volatile int com_softintr_scheduled; 202 #endif 203 #endif 204 205 #ifdef KGDB 206 #include <sys/kgdb.h> 207 208 static int com_kgdb_addr; 209 static bus_space_tag_t com_kgdb_iot; 210 static bus_space_handle_t com_kgdb_ioh; 211 static int com_kgdb_attached; 212 213 int com_kgdb_getc __P((void *)); 214 void com_kgdb_putc __P((void *, int)); 215 #endif /* KGDB */ 216 217 #define COMUNIT_MASK 0x7ffff 218 #define COMDIALOUT_MASK 0x80000 219 220 #define COMUNIT(x) (minor(x) & COMUNIT_MASK) 221 #define COMDIALOUT(x) (minor(x) & COMDIALOUT_MASK) 222 223 #define COM_ISALIVE(sc) ((sc)->enabled != 0 && \ 224 ISSET((sc)->sc_dev.dv_flags, DVF_ACTIVE)) 225 226 int 227 comspeed(speed, frequency) 228 long speed, frequency; 229 { 230 #define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */ 231 232 int x, err; 233 234 #if 0 235 if (speed == 0) 236 return (0); 237 #endif 238 if (speed <= 0) 239 return (-1); 240 x = divrnd(frequency / 16, speed); 241 if (x <= 0) 242 return (-1); 243 err = divrnd(((quad_t)frequency) * 1000 / 16, speed * x) - 1000; 244 if (err < 0) 245 err = -err; 246 if (err > COM_TOLERANCE) 247 return (-1); 248 return (x); 249 250 #undef divrnd(n, q) 251 } 252 253 #ifdef COM_DEBUG 254 int com_debug = 0; 255 256 void comstatus __P((struct com_softc *, char *)); 257 void 258 comstatus(sc, str) 259 struct com_softc *sc; 260 char *str; 261 { 262 struct tty *tp = sc->sc_tty; 263 264 printf("%s: %s %sclocal %sdcd %sts_carr_on %sdtr %stx_stopped\n", 265 sc->sc_dev.dv_xname, str, 266 ISSET(tp->t_cflag, CLOCAL) ? "+" : "-", 267 ISSET(sc->sc_msr, MSR_DCD) ? "+" : "-", 268 ISSET(tp->t_state, TS_CARR_ON) ? "+" : "-", 269 ISSET(sc->sc_mcr, MCR_DTR) ? "+" : "-", 270 sc->sc_tx_stopped ? "+" : "-"); 271 272 printf("%s: %s %scrtscts %scts %sts_ttstop %srts %xrx_flags\n", 273 sc->sc_dev.dv_xname, str, 274 ISSET(tp->t_cflag, CRTSCTS) ? "+" : "-", 275 ISSET(sc->sc_msr, MSR_CTS) ? "+" : "-", 276 ISSET(tp->t_state, TS_TTSTOP) ? "+" : "-", 277 ISSET(sc->sc_mcr, MCR_RTS) ? "+" : "-", 278 sc->sc_rx_flags); 279 } 280 #endif 281 282 int 283 comprobe1(iot, ioh) 284 bus_space_tag_t iot; 285 bus_space_handle_t ioh; 286 { 287 288 /* force access to id reg */ 289 bus_space_write_1(iot, ioh, com_lcr, 0); 290 bus_space_write_1(iot, ioh, com_iir, 0); 291 if (bus_space_read_1(iot, ioh, com_iir) & 0x38) 292 return (0); 293 294 return (1); 295 } 296 297 #ifdef COM_HAYESP 298 int 299 comprobeHAYESP(hayespioh, sc) 300 bus_space_handle_t hayespioh; 301 struct com_softc *sc; 302 { 303 char val, dips; 304 int combaselist[] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8 }; 305 bus_space_tag_t iot = sc->sc_iot; 306 307 /* 308 * Hayes ESP cards have two iobases. One is for compatibility with 309 * 16550 serial chips, and at the same ISA PC base addresses. The 310 * other is for ESP-specific enhanced features, and lies at a 311 * different addressing range entirely (0x140, 0x180, 0x280, or 0x300). 312 */ 313 314 /* Test for ESP signature */ 315 if ((bus_space_read_1(iot, hayespioh, 0) & 0xf3) == 0) 316 return (0); 317 318 /* 319 * ESP is present at ESP enhanced base address; unknown com port 320 */ 321 322 /* Get the dip-switch configurations */ 323 bus_space_write_1(iot, hayespioh, HAYESP_CMD1, HAYESP_GETDIPS); 324 dips = bus_space_read_1(iot, hayespioh, HAYESP_STATUS1); 325 326 /* Determine which com port this ESP card services: bits 0,1 of */ 327 /* dips is the port # (0-3); combaselist[val] is the com_iobase */ 328 if (sc->sc_iobase != combaselist[dips & 0x03]) 329 return (0); 330 331 printf(": ESP"); 332 333 /* Check ESP Self Test bits. */ 334 /* Check for ESP version 2.0: bits 4,5,6 == 010 */ 335 bus_space_write_1(iot, hayespioh, HAYESP_CMD1, HAYESP_GETTEST); 336 val = bus_space_read_1(iot, hayespioh, HAYESP_STATUS1); /* Clear reg1 */ 337 val = bus_space_read_1(iot, hayespioh, HAYESP_STATUS2); 338 if ((val & 0x70) < 0x20) { 339 printf("-old (%o)", val & 0x70); 340 /* we do not support the necessary features */ 341 return (0); 342 } 343 344 /* Check for ability to emulate 16550: bit 8 == 1 */ 345 if ((dips & 0x80) == 0) { 346 printf(" slave"); 347 /* XXX Does slave really mean no 16550 support?? */ 348 return (0); 349 } 350 351 /* 352 * If we made it this far, we are a full-featured ESP v2.0 (or 353 * better), at the correct com port address. 354 */ 355 356 SET(sc->sc_hwflags, COM_HW_HAYESP); 357 printf(", 1024 byte fifo\n"); 358 return (1); 359 } 360 #endif 361 362 #if defined(DDB) || defined(KGDB) 363 static void 364 com_enable_debugport(sc) 365 struct com_softc *sc; 366 { 367 int s; 368 369 /* Turn on line break interrupt, set carrier. */ 370 s = splserial(); 371 sc->sc_ier = IER_ERXRDY; 372 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 373 SET(sc->sc_mcr, MCR_DTR | MCR_RTS); 374 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_mcr, sc->sc_mcr); 375 splx(s); 376 } 377 #endif 378 379 void 380 com_attach_subr(sc) 381 struct com_softc *sc; 382 { 383 int iobase = sc->sc_iobase; 384 bus_space_tag_t iot = sc->sc_iot; 385 bus_space_handle_t ioh = sc->sc_ioh; 386 struct tty *tp; 387 #ifdef COM16650 388 u_int8_t lcr; 389 #endif 390 #ifdef COM_HAYESP 391 int hayesp_ports[] = { 0x140, 0x180, 0x280, 0x300, 0 }; 392 int *hayespp; 393 #endif 394 395 /* Disable interrupts before configuring the device. */ 396 sc->sc_ier = 0; 397 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 398 399 if (iot == comconstag && iobase == comconsaddr) { 400 comconsattached = 1; 401 402 /* Make sure the console is always "hardwired". */ 403 delay(1000); /* wait for output to finish */ 404 SET(sc->sc_hwflags, COM_HW_CONSOLE); 405 SET(sc->sc_swflags, TIOCFLAG_SOFTCAR); 406 } 407 408 #ifdef COM_HAYESP 409 /* Look for a Hayes ESP board. */ 410 for (hayespp = hayesp_ports; *hayespp != 0; hayespp++) { 411 bus_space_handle_t hayespioh; 412 413 #define HAYESP_NPORTS 8 /* XXX XXX XXX ??? ??? ??? */ 414 if (bus_space_map(iot, *hayespp, HAYESP_NPORTS, 0, &hayespioh)) 415 continue; 416 if (comprobeHAYESP(hayespioh, sc)) { 417 sc->sc_hayespioh = hayespioh; 418 sc->sc_fifolen = 1024; 419 420 break; 421 } 422 bus_space_unmap(iot, hayespioh, HAYESP_NPORTS); 423 } 424 /* No ESP; look for other things. */ 425 if (!ISSET(sc->sc_hwflags, COM_HW_HAYESP)) { 426 #endif 427 sc->sc_fifolen = 1; 428 /* look for a NS 16550AF UART with FIFOs */ 429 bus_space_write_1(iot, ioh, com_fifo, 430 FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_14); 431 delay(100); 432 if (ISSET(bus_space_read_1(iot, ioh, com_iir), IIR_FIFO_MASK) 433 == IIR_FIFO_MASK) 434 if (ISSET(bus_space_read_1(iot, ioh, com_fifo), FIFO_TRIGGER_14) 435 == FIFO_TRIGGER_14) { 436 SET(sc->sc_hwflags, COM_HW_FIFO); 437 438 #ifdef COM16650 439 /* 440 * IIR changes into the EFR if LCR is set to LCR_EERS 441 * on 16650s. We also know IIR != 0 at this point. 442 * Write 0 into the EFR, and read it. If the result 443 * is 0, we have a 16650. 444 * 445 * Older 16650s were broken; the test to detect them 446 * is taken from the Linux driver. Apparently 447 * setting DLAB enable gives access to the EFR on 448 * these chips. 449 */ 450 lcr = bus_space_read_1(iot, ioh, com_lcr); 451 bus_space_write_1(iot, ioh, com_lcr, LCR_EERS); 452 bus_space_write_1(iot, ioh, com_efr, 0); 453 if (bus_space_read_1(iot, ioh, com_efr) == 0) { 454 bus_space_write_1(iot, ioh, com_lcr, 455 lcr | LCR_DLAB); 456 if (bus_space_read_1(iot, ioh, com_efr) == 0) { 457 CLR(sc->sc_hwflags, COM_HW_FIFO); 458 sc->sc_fifolen = 0; 459 } else { 460 SET(sc->sc_hwflags, COM_HW_FLOW); 461 sc->sc_fifolen = 32; 462 } 463 } else 464 #endif 465 sc->sc_fifolen = 16; 466 467 #ifdef COM16650 468 bus_space_write_1(iot, ioh, com_lcr, lcr); 469 if (sc->sc_fifolen == 0) 470 printf(": st16650, broken fifo\n"); 471 else if (sc->sc_fifolen == 32) 472 printf(": st16650a, working fifo\n"); 473 else 474 #endif 475 printf(": ns16550a, working fifo\n"); 476 } else 477 printf(": ns16550, broken fifo\n"); 478 else 479 printf(": ns8250 or ns16450, no fifo\n"); 480 bus_space_write_1(iot, ioh, com_fifo, 0); 481 #ifdef COM_HAYESP 482 } 483 #endif 484 485 tp = ttymalloc(); 486 tp->t_oproc = comstart; 487 tp->t_param = comparam; 488 tp->t_hwiflow = comhwiflow; 489 490 sc->sc_tty = tp; 491 sc->sc_rbuf = malloc(com_rbuf_size << 1, M_DEVBUF, M_NOWAIT); 492 if (sc->sc_rbuf == NULL) { 493 printf("%s: unable to allocate ring buffer\n", 494 sc->sc_dev.dv_xname); 495 return; 496 } 497 sc->sc_ebuf = sc->sc_rbuf + (com_rbuf_size << 1); 498 499 tty_attach(tp); 500 501 if (!ISSET(sc->sc_hwflags, COM_HW_NOIEN)) 502 SET(sc->sc_mcr, MCR_IENABLE); 503 504 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 505 int maj; 506 507 /* locate the major number */ 508 for (maj = 0; maj < nchrdev; maj++) 509 if (cdevsw[maj].d_open == comopen) 510 break; 511 512 cn_tab->cn_dev = makedev(maj, sc->sc_dev.dv_unit); 513 514 printf("%s: console\n", sc->sc_dev.dv_xname); 515 } 516 517 #ifdef KGDB 518 /* 519 * Allow kgdb to "take over" this port. If this is 520 * the kgdb device, it has exclusive use. 521 */ 522 if (iot == com_kgdb_iot && iobase == com_kgdb_addr) { 523 com_kgdb_attached = 1; 524 525 SET(sc->sc_hwflags, COM_HW_KGDB); 526 printf("%s: kgdb\n", sc->sc_dev.dv_xname); 527 } 528 #endif 529 530 #ifdef __GENERIC_SOFT_INTERRUPTS 531 sc->sc_si = softintr_establish(IPL_SOFTSERIAL, comsoft, sc); 532 #endif 533 534 #if NRND > 0 && defined(RND_COM) 535 rnd_attach_source(&sc->rnd_source, sc->sc_dev.dv_xname, 536 RND_TYPE_TTY); 537 #endif 538 539 /* if there are no enable/disable functions, assume the device 540 is always enabled */ 541 if (!sc->enable) 542 sc->enabled = 1; 543 544 com_config(sc); 545 546 SET(sc->sc_hwflags, COM_HW_DEV_OK); 547 } 548 549 void 550 com_config(sc) 551 struct com_softc *sc; 552 { 553 bus_space_tag_t iot = sc->sc_iot; 554 bus_space_handle_t ioh = sc->sc_ioh; 555 556 /* Disable interrupts before configuring the device. */ 557 sc->sc_ier = 0; 558 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 559 560 #ifdef COM_HAYESP 561 /* Look for a Hayes ESP board. */ 562 if (ISSET(sc->sc_hwflags, COM_HW_HAYESP)) { 563 sc->sc_fifolen = 1024; 564 565 /* Set 16550 compatibility mode */ 566 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD1, 567 HAYESP_SETMODE); 568 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 569 HAYESP_MODE_FIFO|HAYESP_MODE_RTS| 570 HAYESP_MODE_SCALE); 571 572 /* Set RTS/CTS flow control */ 573 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD1, 574 HAYESP_SETFLOWTYPE); 575 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 576 HAYESP_FLOW_RTS); 577 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 578 HAYESP_FLOW_CTS); 579 580 /* Set flow control levels */ 581 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD1, 582 HAYESP_SETRXFLOW); 583 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 584 HAYESP_HIBYTE(HAYESP_RXHIWMARK)); 585 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 586 HAYESP_LOBYTE(HAYESP_RXHIWMARK)); 587 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 588 HAYESP_HIBYTE(HAYESP_RXLOWMARK)); 589 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 590 HAYESP_LOBYTE(HAYESP_RXLOWMARK)); 591 } 592 #endif 593 594 #ifdef DDB 595 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) 596 com_enable_debugport(sc); 597 #endif 598 599 #ifdef KGDB 600 /* 601 * Allow kgdb to "take over" this port. If this is 602 * the kgdb device, it has exclusive use. 603 */ 604 if (ISSET(sc->sc_hwflags, COM_HW_KGDB)) 605 com_enable_debugport(sc); 606 #endif 607 } 608 609 int 610 com_detach(self, flags) 611 struct device *self; 612 int flags; 613 { 614 struct com_softc *sc = (struct com_softc *)self; 615 int maj, mn; 616 617 /* locate the major number */ 618 for (maj = 0; maj < nchrdev; maj++) 619 if (cdevsw[maj].d_open == comopen) 620 break; 621 622 /* Nuke the vnodes for any open instances. */ 623 mn = self->dv_unit; 624 vdevgone(maj, mn, mn, VCHR); 625 626 mn |= COMDIALOUT_MASK; 627 vdevgone(maj, mn, mn, VCHR); 628 629 /* Free the receive buffer. */ 630 free(sc->sc_rbuf, M_DEVBUF); 631 632 /* Detach and free the tty. */ 633 tty_detach(sc->sc_tty); 634 ttyfree(sc->sc_tty); 635 636 #ifdef __GENERIC_SOFT_INTERRUPTS 637 /* Unhook the soft interrupt handler. */ 638 softintr_disestablish(sc->sc_si); 639 #endif 640 641 #if NRND > 0 && defined(RND_COM) 642 /* Unhook the entropy source. */ 643 rnd_detach_source(&sc->rnd_source); 644 #endif 645 646 return (0); 647 } 648 649 int 650 com_activate(self, act) 651 struct device *self; 652 enum devact act; 653 { 654 struct com_softc *sc = (struct com_softc *)self; 655 int s, rv = 0; 656 657 s = splserial(); 658 switch (act) { 659 case DVACT_ACTIVATE: 660 rv = EOPNOTSUPP; 661 break; 662 663 case DVACT_DEACTIVATE: 664 if (sc->sc_hwflags & (COM_HW_CONSOLE|COM_HW_KGDB)) { 665 rv = EBUSY; 666 break; 667 } 668 669 if (sc->disable != NULL && sc->enabled != 0) { 670 (*sc->disable)(sc); 671 sc->enabled = 0; 672 } 673 break; 674 } 675 splx(s); 676 return (rv); 677 } 678 679 void 680 com_shutdown(sc) 681 struct com_softc *sc; 682 { 683 struct tty *tp = sc->sc_tty; 684 int s; 685 686 s = splserial(); 687 688 /* If we were asserting flow control, then deassert it. */ 689 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 690 com_hwiflow(sc); 691 692 /* Clear any break condition set with TIOCSBRK. */ 693 com_break(sc, 0); 694 695 /* Turn off PPS capture on last close. */ 696 sc->sc_ppsmask = 0; 697 sc->ppsparam.mode = 0; 698 699 /* 700 * Hang up if necessary. Wait a bit, so the other side has time to 701 * notice even if we immediately open the port again. 702 */ 703 if (ISSET(tp->t_cflag, HUPCL)) { 704 com_modem(sc, 0); 705 (void) tsleep(sc, TTIPRI, ttclos, hz); 706 } 707 708 /* Turn off interrupts. */ 709 #ifdef DDB 710 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) 711 sc->sc_ier = IER_ERXRDY; /* interrupt on break */ 712 else 713 #endif 714 sc->sc_ier = 0; 715 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 716 717 if (sc->disable) { 718 #ifdef DIAGNOSTIC 719 if (!sc->enabled) 720 panic("com_shutdown: not enabled?"); 721 #endif 722 (*sc->disable)(sc); 723 sc->enabled = 0; 724 } 725 726 splx(s); 727 } 728 729 int 730 comopen(dev, flag, mode, p) 731 dev_t dev; 732 int flag, mode; 733 struct proc *p; 734 { 735 int unit = COMUNIT(dev); 736 struct com_softc *sc; 737 struct tty *tp; 738 int s, s2; 739 int error; 740 741 if (unit >= com_cd.cd_ndevs) 742 return (ENXIO); 743 sc = com_cd.cd_devs[unit]; 744 if (sc == 0 || !ISSET(sc->sc_hwflags, COM_HW_DEV_OK) || 745 sc->sc_rbuf == NULL) 746 return (ENXIO); 747 748 if (ISSET(sc->sc_dev.dv_flags, DVF_ACTIVE) == 0) 749 return (ENXIO); 750 751 #ifdef KGDB 752 /* 753 * If this is the kgdb port, no other use is permitted. 754 */ 755 if (ISSET(sc->sc_hwflags, COM_HW_KGDB)) 756 return (EBUSY); 757 #endif 758 759 tp = sc->sc_tty; 760 761 if (ISSET(tp->t_state, TS_ISOPEN) && 762 ISSET(tp->t_state, TS_XCLUDE) && 763 p->p_ucred->cr_uid != 0) 764 return (EBUSY); 765 766 s = spltty(); 767 768 /* 769 * Do the following iff this is a first open. 770 */ 771 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 772 struct termios t; 773 774 tp->t_dev = dev; 775 776 s2 = splserial(); 777 778 if (sc->enable) { 779 if ((*sc->enable)(sc)) { 780 splx(s2); 781 splx(s); 782 printf("%s: device enable failed\n", 783 sc->sc_dev.dv_xname); 784 return (EIO); 785 } 786 sc->enabled = 1; 787 com_config(sc); 788 } 789 790 /* Turn on interrupts. */ 791 sc->sc_ier = IER_ERXRDY | IER_ERLS | IER_EMSC; 792 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 793 794 /* Fetch the current modem control status, needed later. */ 795 sc->sc_msr = bus_space_read_1(sc->sc_iot, sc->sc_ioh, com_msr); 796 797 /* Clear PPS capture state on first open. */ 798 sc->sc_ppsmask = 0; 799 sc->ppsparam.mode = 0; 800 801 splx(s2); 802 803 /* 804 * Initialize the termios status to the defaults. Add in the 805 * sticky bits from TIOCSFLAGS. 806 */ 807 t.c_ispeed = 0; 808 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 809 t.c_ospeed = comconsrate; 810 t.c_cflag = comconscflag; 811 } else { 812 t.c_ospeed = TTYDEF_SPEED; 813 t.c_cflag = TTYDEF_CFLAG; 814 } 815 if (ISSET(sc->sc_swflags, TIOCFLAG_CLOCAL)) 816 SET(t.c_cflag, CLOCAL); 817 if (ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS)) 818 SET(t.c_cflag, CRTSCTS); 819 if (ISSET(sc->sc_swflags, TIOCFLAG_MDMBUF)) 820 SET(t.c_cflag, MDMBUF); 821 /* Make sure comparam() will do something. */ 822 tp->t_ospeed = 0; 823 (void) comparam(tp, &t); 824 tp->t_iflag = TTYDEF_IFLAG; 825 tp->t_oflag = TTYDEF_OFLAG; 826 tp->t_lflag = TTYDEF_LFLAG; 827 ttychars(tp); 828 ttsetwater(tp); 829 830 s2 = splserial(); 831 832 /* 833 * Turn on DTR. We must always do this, even if carrier is not 834 * present, because otherwise we'd have to use TIOCSDTR 835 * immediately after setting CLOCAL, which applications do not 836 * expect. We always assert DTR while the device is open 837 * unless explicitly requested to deassert it. 838 */ 839 com_modem(sc, 1); 840 841 /* Clear the input ring, and unblock. */ 842 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 843 sc->sc_rbavail = com_rbuf_size; 844 com_iflush(sc); 845 CLR(sc->sc_rx_flags, RX_ANY_BLOCK); 846 com_hwiflow(sc); 847 848 #ifdef COM_DEBUG 849 if (com_debug) 850 comstatus(sc, "comopen "); 851 #endif 852 853 splx(s2); 854 } 855 856 splx(s); 857 858 error = ttyopen(tp, COMDIALOUT(dev), ISSET(flag, O_NONBLOCK)); 859 if (error) 860 goto bad; 861 862 error = (*linesw[tp->t_line].l_open)(dev, tp); 863 if (error) 864 goto bad; 865 866 return (0); 867 868 bad: 869 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 870 /* 871 * We failed to open the device, and nobody else had it opened. 872 * Clean up the state as appropriate. 873 */ 874 com_shutdown(sc); 875 } 876 877 return (error); 878 } 879 880 int 881 comclose(dev, flag, mode, p) 882 dev_t dev; 883 int flag, mode; 884 struct proc *p; 885 { 886 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 887 struct tty *tp = sc->sc_tty; 888 889 /* XXX This is for cons.c. */ 890 if (!ISSET(tp->t_state, TS_ISOPEN)) 891 return (0); 892 893 (*linesw[tp->t_line].l_close)(tp, flag); 894 ttyclose(tp); 895 896 if (COM_ISALIVE(sc) == 0) 897 return (0); 898 899 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 900 /* 901 * Although we got a last close, the device may still be in 902 * use; e.g. if this was the dialout node, and there are still 903 * processes waiting for carrier on the non-dialout node. 904 */ 905 com_shutdown(sc); 906 } 907 908 return (0); 909 } 910 911 int 912 comread(dev, uio, flag) 913 dev_t dev; 914 struct uio *uio; 915 int flag; 916 { 917 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 918 struct tty *tp = sc->sc_tty; 919 920 if (COM_ISALIVE(sc) == 0) 921 return (EIO); 922 923 return ((*linesw[tp->t_line].l_read)(tp, uio, flag)); 924 } 925 926 int 927 comwrite(dev, uio, flag) 928 dev_t dev; 929 struct uio *uio; 930 int flag; 931 { 932 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 933 struct tty *tp = sc->sc_tty; 934 935 if (COM_ISALIVE(sc) == 0) 936 return (EIO); 937 938 return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 939 } 940 941 struct tty * 942 comtty(dev) 943 dev_t dev; 944 { 945 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 946 struct tty *tp = sc->sc_tty; 947 948 return (tp); 949 } 950 951 int 952 comioctl(dev, cmd, data, flag, p) 953 dev_t dev; 954 u_long cmd; 955 caddr_t data; 956 int flag; 957 struct proc *p; 958 { 959 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 960 struct tty *tp = sc->sc_tty; 961 int error; 962 int s; 963 964 if (COM_ISALIVE(sc) == 0) 965 return (EIO); 966 967 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); 968 if (error >= 0) 969 return (error); 970 971 error = ttioctl(tp, cmd, data, flag, p); 972 if (error >= 0) 973 return (error); 974 975 error = 0; 976 977 s = splserial(); 978 979 switch (cmd) { 980 case TIOCSBRK: 981 com_break(sc, 1); 982 break; 983 984 case TIOCCBRK: 985 com_break(sc, 0); 986 break; 987 988 case TIOCSDTR: 989 com_modem(sc, 1); 990 break; 991 992 case TIOCCDTR: 993 com_modem(sc, 0); 994 break; 995 996 case TIOCGFLAGS: 997 *(int *)data = sc->sc_swflags; 998 break; 999 1000 case TIOCSFLAGS: 1001 error = suser(p->p_ucred, &p->p_acflag); 1002 if (error) 1003 break; 1004 sc->sc_swflags = *(int *)data; 1005 break; 1006 1007 case TIOCMSET: 1008 case TIOCMBIS: 1009 case TIOCMBIC: 1010 tiocm_to_com(sc, cmd, *(int *)data); 1011 break; 1012 1013 case TIOCMGET: 1014 *(int *)data = com_to_tiocm(sc); 1015 break; 1016 1017 case PPS_CREATE: 1018 break; 1019 1020 case PPS_DESTROY: 1021 break; 1022 1023 case PPS_GETPARAMS: { 1024 pps_params_t *pp; 1025 pp = (pps_params_t *)data; 1026 *pp = sc->ppsparam; 1027 break; 1028 } 1029 1030 case PPS_SETPARAMS: { 1031 pps_params_t *pp; 1032 int mode; 1033 pp = (pps_params_t *)data; 1034 if (pp->mode & ~ppscap) { 1035 error = EINVAL; 1036 break; 1037 } 1038 sc->ppsparam = *pp; 1039 /* 1040 * Compute msr masks from user-specified timestamp state. 1041 */ 1042 mode = sc->ppsparam.mode; 1043 #ifdef PPS_SYNC 1044 if (mode & PPS_HARDPPSONASSERT) { 1045 mode |= PPS_CAPTUREASSERT; 1046 /* XXX revoke any previous HARDPPS source */ 1047 } 1048 if (mode & PPS_HARDPPSONCLEAR) { 1049 mode |= PPS_CAPTURECLEAR; 1050 /* XXX revoke any previous HARDPPS source */ 1051 } 1052 #endif /* PPS_SYNC */ 1053 switch (mode & PPS_CAPTUREBOTH) { 1054 case 0: 1055 sc->sc_ppsmask = 0; 1056 break; 1057 1058 case PPS_CAPTUREASSERT: 1059 sc->sc_ppsmask = MSR_DCD; 1060 sc->sc_ppsassert = MSR_DCD; 1061 sc->sc_ppsclear = -1; 1062 break; 1063 1064 case PPS_CAPTURECLEAR: 1065 sc->sc_ppsmask = MSR_DCD; 1066 sc->sc_ppsassert = -1; 1067 sc->sc_ppsclear = 0; 1068 break; 1069 1070 case PPS_CAPTUREBOTH: 1071 sc->sc_ppsmask = MSR_DCD; 1072 sc->sc_ppsassert = MSR_DCD; 1073 sc->sc_ppsclear = 0; 1074 break; 1075 1076 default: 1077 error = EINVAL; 1078 break; 1079 } 1080 break; 1081 } 1082 1083 case PPS_GETCAP: 1084 *(int*)data = ppscap; 1085 break; 1086 1087 case PPS_FETCH: { 1088 pps_info_t *pi; 1089 pi = (pps_info_t *)data; 1090 *pi = sc->ppsinfo; 1091 break; 1092 } 1093 1094 case PPS_WAIT: 1095 /* XXX */ 1096 error = EOPNOTSUPP; 1097 break; 1098 1099 case TIOCDCDTIMESTAMP: /* XXX old, overloaded API used by xntpd v3 */ 1100 /* 1101 * Some GPS clocks models use the falling rather than 1102 * rising edge as the on-the-second signal. 1103 * The old API has no way to specify PPS polarity. 1104 */ 1105 sc->sc_ppsmask = MSR_DCD; 1106 #ifndef PPS_TRAILING_EDGE 1107 sc->sc_ppsassert = MSR_DCD; 1108 sc->sc_ppsclear = -1; 1109 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 1110 &sc->ppsinfo.assert_timestamp); 1111 #else 1112 sc->sc_ppsassert = -1 1113 sc->sc_ppsclear = 0; 1114 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 1115 &sc->ppsinfo.clear_timestamp); 1116 #endif 1117 break; 1118 1119 default: 1120 error = ENOTTY; 1121 break; 1122 } 1123 1124 splx(s); 1125 1126 #ifdef COM_DEBUG 1127 if (com_debug) 1128 comstatus(sc, "comioctl "); 1129 #endif 1130 1131 return (error); 1132 } 1133 1134 integrate void 1135 com_schedrx(sc) 1136 struct com_softc *sc; 1137 { 1138 1139 sc->sc_rx_ready = 1; 1140 1141 /* Wake up the poller. */ 1142 #ifdef __GENERIC_SOFT_INTERRUPTS 1143 softintr_schedule(sc->sc_si); 1144 #else 1145 #ifndef __NO_SOFT_SERIAL_INTERRUPT 1146 setsoftserial(); 1147 #else 1148 if (!com_softintr_scheduled) { 1149 com_softintr_scheduled = 1; 1150 timeout(comsoft, NULL, 1); 1151 } 1152 #endif 1153 #endif 1154 } 1155 1156 void 1157 com_break(sc, onoff) 1158 struct com_softc *sc; 1159 int onoff; 1160 { 1161 1162 if (onoff) 1163 SET(sc->sc_lcr, LCR_SBREAK); 1164 else 1165 CLR(sc->sc_lcr, LCR_SBREAK); 1166 1167 if (!sc->sc_heldchange) { 1168 if (sc->sc_tx_busy) { 1169 sc->sc_heldtbc = sc->sc_tbc; 1170 sc->sc_tbc = 0; 1171 sc->sc_heldchange = 1; 1172 } else 1173 com_loadchannelregs(sc); 1174 } 1175 } 1176 1177 void 1178 com_modem(sc, onoff) 1179 struct com_softc *sc; 1180 int onoff; 1181 { 1182 1183 if (sc->sc_mcr_dtr == 0) 1184 return; 1185 1186 if (onoff) 1187 SET(sc->sc_mcr, sc->sc_mcr_dtr); 1188 else 1189 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 1190 1191 if (!sc->sc_heldchange) { 1192 if (sc->sc_tx_busy) { 1193 sc->sc_heldtbc = sc->sc_tbc; 1194 sc->sc_tbc = 0; 1195 sc->sc_heldchange = 1; 1196 } else 1197 com_loadchannelregs(sc); 1198 } 1199 } 1200 1201 void 1202 tiocm_to_com(sc, how, ttybits) 1203 struct com_softc *sc; 1204 int how, ttybits; 1205 { 1206 u_char combits; 1207 1208 combits = 0; 1209 if (ISSET(ttybits, TIOCM_DTR)) 1210 SET(combits, MCR_DTR); 1211 if (ISSET(ttybits, TIOCM_RTS)) 1212 SET(combits, MCR_RTS); 1213 1214 switch (how) { 1215 case TIOCMBIC: 1216 CLR(sc->sc_mcr, combits); 1217 break; 1218 1219 case TIOCMBIS: 1220 SET(sc->sc_mcr, combits); 1221 break; 1222 1223 case TIOCMSET: 1224 CLR(sc->sc_mcr, MCR_DTR | MCR_RTS); 1225 SET(sc->sc_mcr, combits); 1226 break; 1227 } 1228 1229 if (!sc->sc_heldchange) { 1230 if (sc->sc_tx_busy) { 1231 sc->sc_heldtbc = sc->sc_tbc; 1232 sc->sc_tbc = 0; 1233 sc->sc_heldchange = 1; 1234 } else 1235 com_loadchannelregs(sc); 1236 } 1237 } 1238 1239 int 1240 com_to_tiocm(sc) 1241 struct com_softc *sc; 1242 { 1243 u_char combits; 1244 int ttybits = 0; 1245 1246 combits = sc->sc_mcr; 1247 if (ISSET(combits, MCR_DTR)) 1248 SET(ttybits, TIOCM_DTR); 1249 if (ISSET(combits, MCR_RTS)) 1250 SET(ttybits, TIOCM_RTS); 1251 1252 combits = sc->sc_msr; 1253 if (ISSET(combits, MSR_DCD)) 1254 SET(ttybits, TIOCM_CD); 1255 if (ISSET(combits, MSR_CTS)) 1256 SET(ttybits, TIOCM_CTS); 1257 if (ISSET(combits, MSR_DSR)) 1258 SET(ttybits, TIOCM_DSR); 1259 if (ISSET(combits, MSR_RI | MSR_TERI)) 1260 SET(ttybits, TIOCM_RI); 1261 1262 if (sc->sc_ier != 0) 1263 SET(ttybits, TIOCM_LE); 1264 1265 return (ttybits); 1266 } 1267 1268 static u_char 1269 cflag2lcr(cflag) 1270 tcflag_t cflag; 1271 { 1272 u_char lcr = 0; 1273 1274 switch (ISSET(cflag, CSIZE)) { 1275 case CS5: 1276 SET(lcr, LCR_5BITS); 1277 break; 1278 case CS6: 1279 SET(lcr, LCR_6BITS); 1280 break; 1281 case CS7: 1282 SET(lcr, LCR_7BITS); 1283 break; 1284 case CS8: 1285 SET(lcr, LCR_8BITS); 1286 break; 1287 } 1288 if (ISSET(cflag, PARENB)) { 1289 SET(lcr, LCR_PENAB); 1290 if (!ISSET(cflag, PARODD)) 1291 SET(lcr, LCR_PEVEN); 1292 } 1293 if (ISSET(cflag, CSTOPB)) 1294 SET(lcr, LCR_STOPB); 1295 1296 return (lcr); 1297 } 1298 1299 int 1300 comparam(tp, t) 1301 struct tty *tp; 1302 struct termios *t; 1303 { 1304 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1305 int ospeed = comspeed(t->c_ospeed, sc->sc_frequency); 1306 u_char lcr; 1307 int s; 1308 1309 if (COM_ISALIVE(sc) == 0) 1310 return (EIO); 1311 1312 /* Check requested parameters. */ 1313 if (ospeed < 0) 1314 return (EINVAL); 1315 if (t->c_ispeed && t->c_ispeed != t->c_ospeed) 1316 return (EINVAL); 1317 1318 /* 1319 * For the console, always force CLOCAL and !HUPCL, so that the port 1320 * is always active. 1321 */ 1322 if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) || 1323 ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 1324 SET(t->c_cflag, CLOCAL); 1325 CLR(t->c_cflag, HUPCL); 1326 } 1327 1328 /* 1329 * If there were no changes, don't do anything. This avoids dropping 1330 * input and improves performance when all we did was frob things like 1331 * VMIN and VTIME. 1332 */ 1333 if (tp->t_ospeed == t->c_ospeed && 1334 tp->t_cflag == t->c_cflag) 1335 return (0); 1336 1337 lcr = ISSET(sc->sc_lcr, LCR_SBREAK) | cflag2lcr(t->c_cflag); 1338 1339 s = splserial(); 1340 1341 sc->sc_lcr = lcr; 1342 1343 /* 1344 * If we're not in a mode that assumes a connection is present, then 1345 * ignore carrier changes. 1346 */ 1347 if (ISSET(t->c_cflag, CLOCAL | MDMBUF)) 1348 sc->sc_msr_dcd = 0; 1349 else 1350 sc->sc_msr_dcd = MSR_DCD; 1351 /* 1352 * Set the flow control pins depending on the current flow control 1353 * mode. 1354 */ 1355 if (ISSET(t->c_cflag, CRTSCTS)) { 1356 sc->sc_mcr_dtr = MCR_DTR; 1357 sc->sc_mcr_rts = MCR_RTS; 1358 sc->sc_msr_cts = MSR_CTS; 1359 sc->sc_efr = EFR_AUTORTS | EFR_AUTOCTS; 1360 } else if (ISSET(t->c_cflag, MDMBUF)) { 1361 /* 1362 * For DTR/DCD flow control, make sure we don't toggle DTR for 1363 * carrier detection. 1364 */ 1365 sc->sc_mcr_dtr = 0; 1366 sc->sc_mcr_rts = MCR_DTR; 1367 sc->sc_msr_cts = MSR_DCD; 1368 sc->sc_efr = 0; 1369 } else { 1370 /* 1371 * If no flow control, then always set RTS. This will make 1372 * the other side happy if it mistakenly thinks we're doing 1373 * RTS/CTS flow control. 1374 */ 1375 sc->sc_mcr_dtr = MCR_DTR | MCR_RTS; 1376 sc->sc_mcr_rts = 0; 1377 sc->sc_msr_cts = 0; 1378 sc->sc_efr = 0; 1379 if (ISSET(sc->sc_mcr, MCR_DTR)) 1380 SET(sc->sc_mcr, MCR_RTS); 1381 else 1382 CLR(sc->sc_mcr, MCR_RTS); 1383 } 1384 sc->sc_msr_mask = sc->sc_msr_cts | sc->sc_msr_dcd; 1385 1386 #if 0 1387 if (ospeed == 0) 1388 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 1389 else 1390 SET(sc->sc_mcr, sc->sc_mcr_dtr); 1391 #endif 1392 1393 sc->sc_dlbl = ospeed; 1394 sc->sc_dlbh = ospeed >> 8; 1395 1396 /* 1397 * Set the FIFO threshold based on the receive speed. 1398 * 1399 * * If it's a low speed, it's probably a mouse or some other 1400 * interactive device, so set the threshold low. 1401 * * If it's a high speed, trim the trigger level down to prevent 1402 * overflows. 1403 * * Otherwise set it a bit higher. 1404 */ 1405 if (ISSET(sc->sc_hwflags, COM_HW_HAYESP)) 1406 sc->sc_fifo = FIFO_DMA_MODE | FIFO_ENABLE | FIFO_TRIGGER_8; 1407 else if (ISSET(sc->sc_hwflags, COM_HW_FIFO)) 1408 sc->sc_fifo = FIFO_ENABLE | 1409 (t->c_ospeed <= 1200 ? FIFO_TRIGGER_1 : 1410 t->c_ospeed <= 38400 ? FIFO_TRIGGER_8 : FIFO_TRIGGER_4); 1411 else 1412 sc->sc_fifo = 0; 1413 1414 /* And copy to tty. */ 1415 tp->t_ispeed = 0; 1416 tp->t_ospeed = t->c_ospeed; 1417 tp->t_cflag = t->c_cflag; 1418 1419 if (!sc->sc_heldchange) { 1420 if (sc->sc_tx_busy) { 1421 sc->sc_heldtbc = sc->sc_tbc; 1422 sc->sc_tbc = 0; 1423 sc->sc_heldchange = 1; 1424 } else 1425 com_loadchannelregs(sc); 1426 } 1427 1428 if (!ISSET(t->c_cflag, CHWFLOW)) { 1429 /* Disable the high water mark. */ 1430 sc->sc_r_hiwat = 0; 1431 sc->sc_r_lowat = 0; 1432 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1433 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1434 com_schedrx(sc); 1435 } 1436 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 1437 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 1438 com_hwiflow(sc); 1439 } 1440 } else { 1441 sc->sc_r_hiwat = com_rbuf_hiwat; 1442 sc->sc_r_lowat = com_rbuf_lowat; 1443 } 1444 1445 splx(s); 1446 1447 /* 1448 * Update the tty layer's idea of the carrier bit, in case we changed 1449 * CLOCAL or MDMBUF. We don't hang up here; we only do that by 1450 * explicit request. 1451 */ 1452 (void) (*linesw[tp->t_line].l_modem)(tp, ISSET(sc->sc_msr, MSR_DCD)); 1453 1454 #ifdef COM_DEBUG 1455 if (com_debug) 1456 comstatus(sc, "comparam "); 1457 #endif 1458 1459 if (!ISSET(t->c_cflag, CHWFLOW)) { 1460 if (sc->sc_tx_stopped) { 1461 sc->sc_tx_stopped = 0; 1462 comstart(tp); 1463 } 1464 } 1465 1466 return (0); 1467 } 1468 1469 void 1470 com_iflush(sc) 1471 struct com_softc *sc; 1472 { 1473 bus_space_tag_t iot = sc->sc_iot; 1474 bus_space_handle_t ioh = sc->sc_ioh; 1475 #ifdef DIAGNOSTIC 1476 int reg; 1477 #endif 1478 int timo; 1479 1480 #ifdef DIAGNOSTIC 1481 reg = 0xffff; 1482 #endif 1483 timo = 50000; 1484 /* flush any pending I/O */ 1485 while (ISSET(bus_space_read_1(iot, ioh, com_lsr), LSR_RXRDY) 1486 && --timo) 1487 #ifdef DIAGNOSTIC 1488 reg = 1489 #else 1490 (void) 1491 #endif 1492 bus_space_read_1(iot, ioh, com_data); 1493 #ifdef DIAGNOSTIC 1494 if (!timo) 1495 printf("%s: com_iflush timeout %02x\n", sc->sc_dev.dv_xname, 1496 reg); 1497 #endif 1498 } 1499 1500 void 1501 com_loadchannelregs(sc) 1502 struct com_softc *sc; 1503 { 1504 bus_space_tag_t iot = sc->sc_iot; 1505 bus_space_handle_t ioh = sc->sc_ioh; 1506 1507 /* XXXXX necessary? */ 1508 com_iflush(sc); 1509 1510 bus_space_write_1(iot, ioh, com_ier, 0); 1511 1512 if (ISSET(sc->sc_hwflags, COM_HW_FLOW)) { 1513 bus_space_write_1(iot, ioh, com_lcr, LCR_EERS); 1514 bus_space_write_1(iot, ioh, com_efr, sc->sc_efr); 1515 } 1516 bus_space_write_1(iot, ioh, com_lcr, sc->sc_lcr | LCR_DLAB); 1517 bus_space_write_1(iot, ioh, com_dlbl, sc->sc_dlbl); 1518 bus_space_write_1(iot, ioh, com_dlbh, sc->sc_dlbh); 1519 bus_space_write_1(iot, ioh, com_lcr, sc->sc_lcr); 1520 bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr_active = sc->sc_mcr); 1521 bus_space_write_1(iot, ioh, com_fifo, sc->sc_fifo); 1522 1523 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1524 } 1525 1526 int 1527 comhwiflow(tp, block) 1528 struct tty *tp; 1529 int block; 1530 { 1531 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1532 int s; 1533 1534 if (COM_ISALIVE(sc) == 0) 1535 return (0); 1536 1537 if (sc->sc_mcr_rts == 0) 1538 return (0); 1539 1540 s = splserial(); 1541 if (block) { 1542 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1543 SET(sc->sc_rx_flags, RX_TTY_BLOCKED); 1544 com_hwiflow(sc); 1545 } 1546 } else { 1547 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1548 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1549 com_schedrx(sc); 1550 } 1551 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1552 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED); 1553 com_hwiflow(sc); 1554 } 1555 } 1556 splx(s); 1557 return (1); 1558 } 1559 1560 /* 1561 * (un)block input via hw flowcontrol 1562 */ 1563 void 1564 com_hwiflow(sc) 1565 struct com_softc *sc; 1566 { 1567 bus_space_tag_t iot = sc->sc_iot; 1568 bus_space_handle_t ioh = sc->sc_ioh; 1569 1570 if (sc->sc_mcr_rts == 0) 1571 return; 1572 1573 if (ISSET(sc->sc_rx_flags, RX_ANY_BLOCK)) { 1574 CLR(sc->sc_mcr, sc->sc_mcr_rts); 1575 CLR(sc->sc_mcr_active, sc->sc_mcr_rts); 1576 } else { 1577 SET(sc->sc_mcr, sc->sc_mcr_rts); 1578 SET(sc->sc_mcr_active, sc->sc_mcr_rts); 1579 } 1580 bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr_active); 1581 } 1582 1583 1584 void 1585 comstart(tp) 1586 struct tty *tp; 1587 { 1588 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1589 bus_space_tag_t iot = sc->sc_iot; 1590 bus_space_handle_t ioh = sc->sc_ioh; 1591 int s; 1592 1593 if (COM_ISALIVE(sc) == 0) 1594 return; 1595 1596 s = spltty(); 1597 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 1598 goto out; 1599 if (sc->sc_tx_stopped) 1600 goto out; 1601 1602 if (tp->t_outq.c_cc <= tp->t_lowat) { 1603 if (ISSET(tp->t_state, TS_ASLEEP)) { 1604 CLR(tp->t_state, TS_ASLEEP); 1605 wakeup(&tp->t_outq); 1606 } 1607 selwakeup(&tp->t_wsel); 1608 if (tp->t_outq.c_cc == 0) 1609 goto out; 1610 } 1611 1612 /* Grab the first contiguous region of buffer space. */ 1613 { 1614 u_char *tba; 1615 int tbc; 1616 1617 tba = tp->t_outq.c_cf; 1618 tbc = ndqb(&tp->t_outq, 0); 1619 1620 (void)splserial(); 1621 1622 sc->sc_tba = tba; 1623 sc->sc_tbc = tbc; 1624 } 1625 1626 SET(tp->t_state, TS_BUSY); 1627 sc->sc_tx_busy = 1; 1628 1629 /* Enable transmit completion interrupts if necessary. */ 1630 if (!ISSET(sc->sc_ier, IER_ETXRDY)) { 1631 SET(sc->sc_ier, IER_ETXRDY); 1632 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1633 } 1634 1635 /* Output the first chunk of the contiguous buffer. */ 1636 { 1637 int n; 1638 1639 n = sc->sc_tbc; 1640 if (n > sc->sc_fifolen) 1641 n = sc->sc_fifolen; 1642 bus_space_write_multi_1(iot, ioh, com_data, sc->sc_tba, n); 1643 sc->sc_tbc -= n; 1644 sc->sc_tba += n; 1645 } 1646 out: 1647 splx(s); 1648 return; 1649 } 1650 1651 /* 1652 * Stop output on a line. 1653 */ 1654 void 1655 comstop(tp, flag) 1656 struct tty *tp; 1657 int flag; 1658 { 1659 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1660 int s; 1661 1662 s = splserial(); 1663 if (ISSET(tp->t_state, TS_BUSY)) { 1664 /* Stop transmitting at the next chunk. */ 1665 sc->sc_tbc = 0; 1666 sc->sc_heldtbc = 0; 1667 if (!ISSET(tp->t_state, TS_TTSTOP)) 1668 SET(tp->t_state, TS_FLUSH); 1669 } 1670 splx(s); 1671 } 1672 1673 void 1674 comdiag(arg) 1675 void *arg; 1676 { 1677 struct com_softc *sc = arg; 1678 int overflows, floods; 1679 int s; 1680 1681 s = splserial(); 1682 overflows = sc->sc_overflows; 1683 sc->sc_overflows = 0; 1684 floods = sc->sc_floods; 1685 sc->sc_floods = 0; 1686 sc->sc_errors = 0; 1687 splx(s); 1688 1689 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1690 sc->sc_dev.dv_xname, 1691 overflows, overflows == 1 ? "" : "s", 1692 floods, floods == 1 ? "" : "s"); 1693 } 1694 1695 integrate void 1696 com_rxsoft(sc, tp) 1697 struct com_softc *sc; 1698 struct tty *tp; 1699 { 1700 int (*rint) __P((int c, struct tty *tp)) = linesw[tp->t_line].l_rint; 1701 u_char *get, *end; 1702 u_int cc, scc; 1703 u_char lsr; 1704 int code; 1705 int s; 1706 1707 end = sc->sc_ebuf; 1708 get = sc->sc_rbget; 1709 scc = cc = com_rbuf_size - sc->sc_rbavail; 1710 1711 if (cc == com_rbuf_size) { 1712 sc->sc_floods++; 1713 if (sc->sc_errors++ == 0) 1714 timeout(comdiag, sc, 60 * hz); 1715 } 1716 1717 while (cc) { 1718 code = get[0]; 1719 lsr = get[1]; 1720 if (ISSET(lsr, LSR_OE | LSR_BI | LSR_FE | LSR_PE)) { 1721 if (ISSET(lsr, LSR_OE)) { 1722 sc->sc_overflows++; 1723 if (sc->sc_errors++ == 0) 1724 timeout(comdiag, sc, 60 * hz); 1725 } 1726 if (ISSET(lsr, LSR_BI | LSR_FE)) 1727 SET(code, TTY_FE); 1728 if (ISSET(lsr, LSR_PE)) 1729 SET(code, TTY_PE); 1730 } 1731 if ((*rint)(code, tp) == -1) { 1732 /* 1733 * The line discipline's buffer is out of space. 1734 */ 1735 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1736 /* 1737 * We're either not using flow control, or the 1738 * line discipline didn't tell us to block for 1739 * some reason. Either way, we have no way to 1740 * know when there's more space available, so 1741 * just drop the rest of the data. 1742 */ 1743 get += cc << 1; 1744 if (get >= end) 1745 get -= com_rbuf_size << 1; 1746 cc = 0; 1747 } else { 1748 /* 1749 * Don't schedule any more receive processing 1750 * until the line discipline tells us there's 1751 * space available (through comhwiflow()). 1752 * Leave the rest of the data in the input 1753 * buffer. 1754 */ 1755 SET(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1756 } 1757 break; 1758 } 1759 get += 2; 1760 if (get >= end) 1761 get = sc->sc_rbuf; 1762 cc--; 1763 } 1764 1765 if (cc != scc) { 1766 sc->sc_rbget = get; 1767 s = splserial(); 1768 cc = sc->sc_rbavail += scc - cc; 1769 /* Buffers should be ok again, release possible block. */ 1770 if (cc >= sc->sc_r_lowat) { 1771 if (ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1772 CLR(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1773 SET(sc->sc_ier, IER_ERXRDY); 1774 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 1775 } 1776 if (ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED)) { 1777 CLR(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1778 com_hwiflow(sc); 1779 } 1780 } 1781 splx(s); 1782 } 1783 } 1784 1785 integrate void 1786 com_txsoft(sc, tp) 1787 struct com_softc *sc; 1788 struct tty *tp; 1789 { 1790 1791 CLR(tp->t_state, TS_BUSY); 1792 if (ISSET(tp->t_state, TS_FLUSH)) 1793 CLR(tp->t_state, TS_FLUSH); 1794 else 1795 ndflush(&tp->t_outq, (int)(sc->sc_tba - tp->t_outq.c_cf)); 1796 (*linesw[tp->t_line].l_start)(tp); 1797 } 1798 1799 integrate void 1800 com_stsoft(sc, tp) 1801 struct com_softc *sc; 1802 struct tty *tp; 1803 { 1804 u_char msr, delta; 1805 int s; 1806 1807 s = splserial(); 1808 msr = sc->sc_msr; 1809 delta = sc->sc_msr_delta; 1810 sc->sc_msr_delta = 0; 1811 splx(s); 1812 1813 if (ISSET(delta, sc->sc_msr_dcd)) { 1814 /* 1815 * Inform the tty layer that carrier detect changed. 1816 */ 1817 (void) (*linesw[tp->t_line].l_modem)(tp, ISSET(msr, MSR_DCD)); 1818 } 1819 1820 if (ISSET(delta, sc->sc_msr_cts)) { 1821 /* Block or unblock output according to flow control. */ 1822 if (ISSET(msr, sc->sc_msr_cts)) { 1823 sc->sc_tx_stopped = 0; 1824 (*linesw[tp->t_line].l_start)(tp); 1825 } else { 1826 sc->sc_tx_stopped = 1; 1827 } 1828 } 1829 1830 #ifdef COM_DEBUG 1831 if (com_debug) 1832 comstatus(sc, "com_stsoft"); 1833 #endif 1834 } 1835 1836 #ifdef __GENERIC_SOFT_INTERRUPTS 1837 void 1838 comsoft(arg) 1839 void *arg; 1840 { 1841 struct com_softc *sc = arg; 1842 struct tty *tp; 1843 1844 if (COM_ISALIVE(sc) == 0) 1845 return; 1846 1847 { 1848 #else 1849 void 1850 #ifndef __NO_SOFT_SERIAL_INTERRUPT 1851 comsoft() 1852 #else 1853 comsoft(arg) 1854 void *arg; 1855 #endif 1856 { 1857 struct com_softc *sc; 1858 struct tty *tp; 1859 int unit; 1860 #ifdef __NO_SOFT_SERIAL_INTERRUPT 1861 int s; 1862 1863 s = splsoftserial(); 1864 com_softintr_scheduled = 0; 1865 #endif 1866 1867 for (unit = 0; unit < com_cd.cd_ndevs; unit++) { 1868 sc = com_cd.cd_devs[unit]; 1869 if (sc == NULL || !ISSET(sc->sc_hwflags, COM_HW_DEV_OK)) 1870 continue; 1871 1872 if (COM_ISALIVE(sc) == 0) 1873 continue; 1874 1875 tp = sc->sc_tty; 1876 if (tp == NULL) 1877 continue; 1878 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) 1879 continue; 1880 #endif 1881 tp = sc->sc_tty; 1882 1883 if (sc->sc_rx_ready) { 1884 sc->sc_rx_ready = 0; 1885 com_rxsoft(sc, tp); 1886 } 1887 1888 if (sc->sc_st_check) { 1889 sc->sc_st_check = 0; 1890 com_stsoft(sc, tp); 1891 } 1892 1893 if (sc->sc_tx_done) { 1894 sc->sc_tx_done = 0; 1895 com_txsoft(sc, tp); 1896 } 1897 } 1898 1899 #ifndef __GENERIC_SOFT_INTERRUPTS 1900 #ifdef __NO_SOFT_SERIAL_INTERRUPT 1901 splx(s); 1902 #endif 1903 #endif 1904 } 1905 1906 #ifdef __ALIGN_BRACKET_LEVEL_FOR_CTAGS 1907 /* there has got to be a better way to do comsoft() */ 1908 }} 1909 #endif 1910 1911 int 1912 comintr(arg) 1913 void *arg; 1914 { 1915 struct com_softc *sc = arg; 1916 bus_space_tag_t iot = sc->sc_iot; 1917 bus_space_handle_t ioh = sc->sc_ioh; 1918 u_char *put, *end; 1919 u_int cc; 1920 u_char lsr, iir; 1921 1922 if (COM_ISALIVE(sc) == 0) 1923 return (0); 1924 1925 iir = bus_space_read_1(iot, ioh, com_iir); 1926 if (ISSET(iir, IIR_NOPEND)) 1927 return (0); 1928 1929 end = sc->sc_ebuf; 1930 put = sc->sc_rbput; 1931 cc = sc->sc_rbavail; 1932 1933 do { 1934 u_char msr, delta; 1935 1936 lsr = bus_space_read_1(iot, ioh, com_lsr); 1937 #if defined(DDB) || defined(KGDB) 1938 if (ISSET(lsr, LSR_BI)) { 1939 #ifdef DDB 1940 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 1941 console_debugger(); 1942 continue; 1943 } 1944 #endif 1945 #ifdef KGDB 1946 if (ISSET(sc->sc_hwflags, COM_HW_KGDB)) { 1947 kgdb_connect(1); 1948 continue; 1949 } 1950 #endif 1951 } 1952 #endif /* DDB || KGDB */ 1953 1954 if (ISSET(lsr, LSR_RCV_MASK) && 1955 !ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1956 while (cc > 0) { 1957 put[0] = bus_space_read_1(iot, ioh, com_data); 1958 put[1] = lsr; 1959 put += 2; 1960 if (put >= end) 1961 put = sc->sc_rbuf; 1962 cc--; 1963 1964 lsr = bus_space_read_1(iot, ioh, com_lsr); 1965 if (!ISSET(lsr, LSR_RCV_MASK)) 1966 break; 1967 } 1968 1969 /* 1970 * Current string of incoming characters ended because 1971 * no more data was available or we ran out of space. 1972 * Schedule a receive event if any data was received. 1973 * If we're out of space, turn off receive interrupts. 1974 */ 1975 sc->sc_rbput = put; 1976 sc->sc_rbavail = cc; 1977 if (!ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) 1978 sc->sc_rx_ready = 1; 1979 1980 /* 1981 * See if we are in danger of overflowing a buffer. If 1982 * so, use hardware flow control to ease the pressure. 1983 */ 1984 if (!ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED) && 1985 cc < sc->sc_r_hiwat) { 1986 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1987 com_hwiflow(sc); 1988 } 1989 1990 /* 1991 * If we're out of space, disable receive interrupts 1992 * until the queue has drained a bit. 1993 */ 1994 if (!cc) { 1995 SET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1996 CLR(sc->sc_ier, IER_ERXRDY); 1997 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1998 } 1999 } else { 2000 if ((iir & IIR_IMASK) == IIR_RXRDY) { 2001 bus_space_write_1(iot, ioh, com_ier, 0); 2002 delay(10); 2003 bus_space_write_1(iot, ioh, com_ier,sc->sc_ier); 2004 iir = IIR_NOPEND; 2005 continue; 2006 } 2007 } 2008 2009 msr = bus_space_read_1(iot, ioh, com_msr); 2010 delta = msr ^ sc->sc_msr; 2011 sc->sc_msr = msr; 2012 if (ISSET(delta, sc->sc_msr_mask)) { 2013 SET(sc->sc_msr_delta, delta); 2014 2015 /* 2016 * Pulse-per-second clock signal on edge of DCD? 2017 */ 2018 if (ISSET(delta, sc->sc_ppsmask)) { 2019 struct timeval tv; 2020 if (ISSET(msr, sc->sc_ppsmask) == 2021 sc->sc_ppsassert) { 2022 /* XXX nanotime() */ 2023 microtime(&tv); 2024 TIMEVAL_TO_TIMESPEC(&tv, 2025 &sc->ppsinfo.assert_timestamp); 2026 if (sc->ppsparam.mode & PPS_OFFSETASSERT) { 2027 timespecadd(&sc->ppsinfo.assert_timestamp, 2028 &sc->ppsparam.assert_offset, 2029 &sc->ppsinfo.assert_timestamp); 2030 TIMESPEC_TO_TIMEVAL(&tv, &sc->ppsinfo.assert_timestamp); 2031 } 2032 2033 #ifdef PPS_SYNC 2034 if (sc->ppsparam.mode & PPS_HARDPPSONASSERT) 2035 hardpps(&tv, tv.tv_usec); 2036 #endif 2037 sc->ppsinfo.assert_sequence++; 2038 sc->ppsinfo.current_mode = 2039 sc->ppsparam.mode; 2040 2041 } else if (ISSET(msr, sc->sc_ppsmask) == 2042 sc->sc_ppsclear) { 2043 /* XXX nanotime() */ 2044 microtime(&tv); 2045 TIMEVAL_TO_TIMESPEC(&tv, 2046 &sc->ppsinfo.clear_timestamp); 2047 if (sc->ppsparam.mode & PPS_OFFSETCLEAR) { 2048 timespecadd(&sc->ppsinfo.clear_timestamp, 2049 &sc->ppsparam.clear_offset, 2050 &sc->ppsinfo.clear_timestamp); 2051 TIMESPEC_TO_TIMEVAL(&tv, &sc->ppsinfo.clear_timestamp); 2052 } 2053 2054 #ifdef PPS_SYNC 2055 if (sc->ppsparam.mode & PPS_HARDPPSONCLEAR) 2056 hardpps(&tv, tv.tv_usec); 2057 #endif 2058 sc->ppsinfo.clear_sequence++; 2059 sc->ppsinfo.current_mode = 2060 sc->ppsparam.mode; 2061 } 2062 } 2063 2064 /* 2065 * Stop output immediately if we lose the output 2066 * flow control signal or carrier detect. 2067 */ 2068 if (ISSET(~msr, sc->sc_msr_mask)) { 2069 sc->sc_tbc = 0; 2070 sc->sc_heldtbc = 0; 2071 #ifdef COM_DEBUG 2072 if (com_debug) 2073 comstatus(sc, "comintr "); 2074 #endif 2075 } 2076 2077 sc->sc_st_check = 1; 2078 } 2079 } while (!ISSET((iir = bus_space_read_1(iot, ioh, com_iir)), IIR_NOPEND)); 2080 2081 /* 2082 * Done handling any receive interrupts. See if data can be 2083 * transmitted as well. Schedule tx done event if no data left 2084 * and tty was marked busy. 2085 */ 2086 if (ISSET(lsr, LSR_TXRDY)) { 2087 /* 2088 * If we've delayed a parameter change, do it now, and restart 2089 * output. 2090 */ 2091 if (sc->sc_heldchange) { 2092 com_loadchannelregs(sc); 2093 sc->sc_heldchange = 0; 2094 sc->sc_tbc = sc->sc_heldtbc; 2095 sc->sc_heldtbc = 0; 2096 } 2097 2098 /* Output the next chunk of the contiguous buffer, if any. */ 2099 if (sc->sc_tbc > 0) { 2100 int n; 2101 2102 n = sc->sc_tbc; 2103 if (n > sc->sc_fifolen) 2104 n = sc->sc_fifolen; 2105 bus_space_write_multi_1(iot, ioh, com_data, sc->sc_tba, n); 2106 sc->sc_tbc -= n; 2107 sc->sc_tba += n; 2108 } else { 2109 /* Disable transmit completion interrupts if necessary. */ 2110 if (ISSET(sc->sc_ier, IER_ETXRDY)) { 2111 CLR(sc->sc_ier, IER_ETXRDY); 2112 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 2113 } 2114 if (sc->sc_tx_busy) { 2115 sc->sc_tx_busy = 0; 2116 sc->sc_tx_done = 1; 2117 } 2118 } 2119 } 2120 2121 /* Wake up the poller. */ 2122 #ifdef __GENERIC_SOFT_INTERRUPTS 2123 softintr_schedule(sc->sc_si); 2124 #else 2125 #ifndef __NO_SOFT_SERIAL_INTERRUPT 2126 setsoftserial(); 2127 #else 2128 if (!com_softintr_scheduled) { 2129 com_softintr_scheduled = 1; 2130 timeout(comsoft, NULL, 1); 2131 } 2132 #endif 2133 #endif 2134 2135 #if NRND > 0 && defined(RND_COM) 2136 rnd_add_uint32(&sc->rnd_source, iir | lsr); 2137 #endif 2138 2139 return (1); 2140 } 2141 2142 /* 2143 * The following functions are polled getc and putc routines, shared 2144 * by the console and kgdb glue. 2145 */ 2146 2147 int 2148 com_common_getc(iot, ioh) 2149 bus_space_tag_t iot; 2150 bus_space_handle_t ioh; 2151 { 2152 int s = splserial(); 2153 u_char stat, c; 2154 2155 /* block until a character becomes available */ 2156 while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_RXRDY)) 2157 ; 2158 2159 c = bus_space_read_1(iot, ioh, com_data); 2160 stat = bus_space_read_1(iot, ioh, com_iir); 2161 splx(s); 2162 return (c); 2163 } 2164 2165 void 2166 com_common_putc(iot, ioh, c) 2167 bus_space_tag_t iot; 2168 bus_space_handle_t ioh; 2169 int c; 2170 { 2171 int s = splserial(); 2172 u_char stat; 2173 int timo; 2174 2175 /* wait for any pending transmission to finish */ 2176 timo = 50000; 2177 while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_TXRDY) 2178 && --timo) 2179 ; 2180 2181 bus_space_write_1(iot, ioh, com_data, c); 2182 /* wait for this transmission to complete */ 2183 timo = 1500000; 2184 while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_TXRDY) 2185 && --timo) 2186 ; 2187 2188 /* clear any interrupts generated by this transmission */ 2189 stat = bus_space_read_1(iot, ioh, com_iir); 2190 splx(s); 2191 } 2192 2193 /* 2194 * Initialize UART to known state. 2195 */ 2196 int 2197 cominit(iot, iobase, rate, frequency, cflag, iohp) 2198 bus_space_tag_t iot; 2199 int iobase; 2200 int rate, frequency; 2201 tcflag_t cflag; 2202 bus_space_handle_t *iohp; 2203 { 2204 bus_space_handle_t ioh; 2205 2206 if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) 2207 return (ENOMEM); /* ??? */ 2208 2209 bus_space_write_1(iot, ioh, com_lcr, LCR_EERS); 2210 bus_space_write_1(iot, ioh, com_efr, 0); 2211 bus_space_write_1(iot, ioh, com_lcr, LCR_DLAB); 2212 rate = comspeed(rate, frequency); 2213 bus_space_write_1(iot, ioh, com_dlbl, rate); 2214 bus_space_write_1(iot, ioh, com_dlbh, rate >> 8); 2215 bus_space_write_1(iot, ioh, com_lcr, cflag2lcr(cflag)); 2216 bus_space_write_1(iot, ioh, com_mcr, 0); 2217 bus_space_write_1(iot, ioh, com_fifo, 2218 FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_1); 2219 bus_space_write_1(iot, ioh, com_ier, 0); 2220 2221 *iohp = ioh; 2222 return (0); 2223 } 2224 2225 /* 2226 * Following are all routines needed for COM to act as console 2227 */ 2228 2229 int 2230 comcnattach(iot, iobase, rate, frequency, cflag) 2231 bus_space_tag_t iot; 2232 int iobase; 2233 int rate, frequency; 2234 tcflag_t cflag; 2235 { 2236 int res; 2237 static struct consdev comcons = { 2238 NULL, NULL, comcngetc, comcnputc, comcnpollc, NODEV, CN_NORMAL 2239 }; 2240 2241 res = cominit(iot, iobase, rate, frequency, cflag, &comconsioh); 2242 if (res) 2243 return (res); 2244 2245 cn_tab = &comcons; 2246 2247 comconstag = iot; 2248 comconsaddr = iobase; 2249 comconsrate = rate; 2250 comconscflag = cflag; 2251 2252 return (0); 2253 } 2254 2255 int 2256 comcngetc(dev) 2257 dev_t dev; 2258 { 2259 2260 return (com_common_getc(comconstag, comconsioh)); 2261 } 2262 2263 /* 2264 * Console kernel output character routine. 2265 */ 2266 void 2267 comcnputc(dev, c) 2268 dev_t dev; 2269 int c; 2270 { 2271 2272 com_common_putc(comconstag, comconsioh, c); 2273 } 2274 2275 void 2276 comcnpollc(dev, on) 2277 dev_t dev; 2278 int on; 2279 { 2280 2281 } 2282 2283 #ifdef KGDB 2284 int 2285 com_kgdb_attach(iot, iobase, rate, frequency, cflag) 2286 bus_space_tag_t iot; 2287 int iobase; 2288 int rate, frequency; 2289 tcflag_t cflag; 2290 { 2291 int res; 2292 2293 if (iot == comconstag && iobase == comconsaddr) 2294 return (EBUSY); /* cannot share with console */ 2295 2296 res = cominit(iot, iobase, rate, frequency, cflag, &com_kgdb_ioh); 2297 if (res) 2298 return (res); 2299 2300 kgdb_attach(com_kgdb_getc, com_kgdb_putc, NULL); 2301 kgdb_dev = 123; /* unneeded, only to satisfy some tests */ 2302 2303 com_kgdb_iot = iot; 2304 com_kgdb_addr = iobase; 2305 2306 return (0); 2307 } 2308 2309 /* ARGSUSED */ 2310 int 2311 com_kgdb_getc(arg) 2312 void *arg; 2313 { 2314 2315 return (com_common_getc(com_kgdb_iot, com_kgdb_ioh)); 2316 } 2317 2318 /* ARGSUSED */ 2319 void 2320 com_kgdb_putc(arg, c) 2321 void *arg; 2322 int c; 2323 { 2324 2325 return (com_common_putc(com_kgdb_iot, com_kgdb_ioh, c)); 2326 } 2327 #endif /* KGDB */ 2328 2329 /* helper function to identify the com ports used by 2330 console or KGDB (and not yet autoconf attached) */ 2331 int 2332 com_is_console(iot, iobase, ioh) 2333 bus_space_tag_t iot; 2334 int iobase; 2335 bus_space_handle_t *ioh; 2336 { 2337 bus_space_handle_t help; 2338 2339 if (!comconsattached && 2340 iot == comconstag && iobase == comconsaddr) 2341 help = comconsioh; 2342 #ifdef KGDB 2343 else if (!com_kgdb_attached && 2344 iot == com_kgdb_iot && iobase == com_kgdb_addr) 2345 help = com_kgdb_ioh; 2346 #endif 2347 else 2348 return (0); 2349 2350 if (ioh) 2351 *ioh = help; 2352 return (1); 2353 } 2354
Indexes created Fri Sep 26 20:09:58 GMT 2025