com.c revision 1.152
1 /* $NetBSD: com.c,v 1.152 1999/02/03 23:22:11 mycroft Exp $ */ 2 3 /*- 4 * Copyright (c) 1998 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 com_iflush __P((struct com_softc *)); 141 142 int com_common_getc __P((bus_space_tag_t, bus_space_handle_t)); 143 void com_common_putc __P((bus_space_tag_t, bus_space_handle_t, int)); 144 145 /* XXX: These belong elsewhere */ 146 cdev_decl(com); 147 bdev_decl(com); 148 149 int comcngetc __P((dev_t)); 150 void comcnputc __P((dev_t, int)); 151 void comcnpollc __P((dev_t, int)); 152 153 #define integrate static inline 154 #ifdef __GENERIC_SOFT_INTERRUPTS 155 void comsoft __P((void *)); 156 #else 157 #ifndef __NO_SOFT_SERIAL_INTERRUPT 158 void comsoft __P((void)); 159 #else 160 void comsoft __P((void *)); 161 #endif 162 #endif 163 integrate void com_rxsoft __P((struct com_softc *, struct tty *)); 164 integrate void com_txsoft __P((struct com_softc *, struct tty *)); 165 integrate void com_stsoft __P((struct com_softc *, struct tty *)); 166 integrate void com_schedrx __P((struct com_softc *)); 167 void comdiag __P((void *)); 168 169 extern struct cfdriver com_cd; 170 171 /* 172 * Make this an option variable one can patch. 173 * But be warned: this must be a power of 2! 174 */ 175 u_int com_rbuf_size = COM_RING_SIZE; 176 177 /* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */ 178 u_int com_rbuf_hiwat = (COM_RING_SIZE * 1) / 4; 179 u_int com_rbuf_lowat = (COM_RING_SIZE * 3) / 4; 180 181 static int comconsaddr; 182 static bus_space_tag_t comconstag; 183 static bus_space_handle_t comconsioh; 184 static int comconsattached; 185 static int comconsrate; 186 static tcflag_t comconscflag; 187 188 static int ppscap = 189 PPS_TSFMT_TSPEC | 190 PPS_CAPTUREASSERT | 191 PPS_CAPTURECLEAR | 192 #ifdef PPS_SYNC 193 PPS_HARDPPSONASSERT | PPS_HARDPPSONCLEAR | 194 #endif /* PPS_SYNC */ 195 PPS_OFFSETASSERT | PPS_OFFSETCLEAR; 196 197 static u_char tiocm_xxx2mcr __P((int)); 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 static u_char 952 tiocm_xxx2mcr(data) 953 int data; 954 { 955 u_char m = 0; 956 957 if (ISSET(data, TIOCM_DTR)) 958 SET(m, MCR_DTR); 959 if (ISSET(data, TIOCM_RTS)) 960 SET(m, MCR_RTS); 961 return m; 962 } 963 964 int 965 comioctl(dev, cmd, data, flag, p) 966 dev_t dev; 967 u_long cmd; 968 caddr_t data; 969 int flag; 970 struct proc *p; 971 { 972 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 973 struct tty *tp = sc->sc_tty; 974 int error; 975 int s; 976 977 if (COM_ISALIVE(sc) == 0) 978 return (EIO); 979 980 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); 981 if (error >= 0) 982 return (error); 983 984 error = ttioctl(tp, cmd, data, flag, p); 985 if (error >= 0) 986 return (error); 987 988 error = 0; 989 990 s = splserial(); 991 992 switch (cmd) { 993 case TIOCSBRK: 994 com_break(sc, 1); 995 break; 996 997 case TIOCCBRK: 998 com_break(sc, 0); 999 break; 1000 1001 case TIOCSDTR: 1002 com_modem(sc, 1); 1003 break; 1004 1005 case TIOCCDTR: 1006 com_modem(sc, 0); 1007 break; 1008 1009 case TIOCGFLAGS: 1010 *(int *)data = sc->sc_swflags; 1011 break; 1012 1013 case TIOCSFLAGS: 1014 error = suser(p->p_ucred, &p->p_acflag); 1015 if (error) 1016 break; 1017 sc->sc_swflags = *(int *)data; 1018 break; 1019 1020 case TIOCMSET: 1021 CLR(sc->sc_mcr, MCR_DTR | MCR_RTS); 1022 /*FALLTHROUGH*/ 1023 1024 case TIOCMBIS: 1025 SET(sc->sc_mcr, tiocm_xxx2mcr(*(int *)data)); 1026 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_mcr, sc->sc_mcr); 1027 break; 1028 1029 case TIOCMBIC: 1030 CLR(sc->sc_mcr, tiocm_xxx2mcr(*(int *)data)); 1031 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_mcr, sc->sc_mcr); 1032 break; 1033 1034 case TIOCMGET: { 1035 u_char m; 1036 int bits = 0; 1037 1038 m = sc->sc_mcr; 1039 if (ISSET(m, MCR_DTR)) 1040 SET(bits, TIOCM_DTR); 1041 if (ISSET(m, MCR_RTS)) 1042 SET(bits, TIOCM_RTS); 1043 m = sc->sc_msr; 1044 if (ISSET(m, MSR_DCD)) 1045 SET(bits, TIOCM_CD); 1046 if (ISSET(m, MSR_CTS)) 1047 SET(bits, TIOCM_CTS); 1048 if (ISSET(m, MSR_DSR)) 1049 SET(bits, TIOCM_DSR); 1050 if (ISSET(m, MSR_RI | MSR_TERI)) 1051 SET(bits, TIOCM_RI); 1052 if (bus_space_read_1(sc->sc_iot, sc->sc_ioh, com_ier)) 1053 SET(bits, TIOCM_LE); 1054 *(int *)data = bits; 1055 break; 1056 } 1057 1058 case PPS_CREATE: 1059 break; 1060 1061 case PPS_DESTROY: 1062 break; 1063 1064 case PPS_GETPARAMS: { 1065 pps_params_t *pp; 1066 pp = (pps_params_t *)data; 1067 *pp = sc->ppsparam; 1068 break; 1069 } 1070 1071 case PPS_SETPARAMS: { 1072 pps_params_t *pp; 1073 int mode; 1074 pp = (pps_params_t *)data; 1075 if (pp->mode & ~ppscap) { 1076 error = EINVAL; 1077 break; 1078 } 1079 sc->ppsparam = *pp; 1080 /* 1081 * Compute msr masks from user-specified timestamp state. 1082 */ 1083 mode = sc->ppsparam.mode; 1084 #ifdef PPS_SYNC 1085 if (mode & PPS_HARDPPSONASSERT) { 1086 mode |= PPS_CAPTUREASSERT; 1087 /* XXX revoke any previous HARDPPS source */ 1088 } 1089 if (mode & PPS_HARDPPSONCLEAR) { 1090 mode |= PPS_CAPTURECLEAR; 1091 /* XXX revoke any previous HARDPPS source */ 1092 } 1093 #endif /* PPS_SYNC */ 1094 switch (mode & PPS_CAPTUREBOTH) { 1095 case 0: 1096 sc->sc_ppsmask = 0; 1097 break; 1098 1099 case PPS_CAPTUREASSERT: 1100 sc->sc_ppsmask = MSR_DCD; 1101 sc->sc_ppsassert = MSR_DCD; 1102 sc->sc_ppsclear = -1; 1103 break; 1104 1105 case PPS_CAPTURECLEAR: 1106 sc->sc_ppsmask = MSR_DCD; 1107 sc->sc_ppsassert = -1; 1108 sc->sc_ppsclear = 0; 1109 break; 1110 1111 case PPS_CAPTUREBOTH: 1112 sc->sc_ppsmask = MSR_DCD; 1113 sc->sc_ppsassert = MSR_DCD; 1114 sc->sc_ppsclear = 0; 1115 break; 1116 1117 default: 1118 error = EINVAL; 1119 break; 1120 } 1121 break; 1122 } 1123 1124 case PPS_GETCAP: 1125 *(int*)data = ppscap; 1126 break; 1127 1128 case PPS_FETCH: { 1129 pps_info_t *pi; 1130 pi = (pps_info_t *)data; 1131 *pi = sc->ppsinfo; 1132 break; 1133 } 1134 1135 case PPS_WAIT: 1136 /* XXX */ 1137 error = EOPNOTSUPP; 1138 break; 1139 1140 case TIOCDCDTIMESTAMP: /* XXX old, overloaded API used by xntpd v3 */ 1141 /* 1142 * Some GPS clocks models use the falling rather than 1143 * rising edge as the on-the-second signal. 1144 * The old API has no way to specify PPS polarity. 1145 */ 1146 sc->sc_ppsmask = MSR_DCD; 1147 #ifndef PPS_TRAILING_EDGE 1148 sc->sc_ppsassert = MSR_DCD; 1149 sc->sc_ppsclear = -1; 1150 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 1151 &sc->ppsinfo.assert_timestamp); 1152 #else 1153 sc->sc_ppsassert = -1 1154 sc->sc_ppsclear = 0; 1155 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 1156 &sc->ppsinfo.clear_timestamp); 1157 #endif 1158 break; 1159 1160 default: 1161 error = ENOTTY; 1162 break; 1163 } 1164 1165 splx(s); 1166 1167 #ifdef COM_DEBUG 1168 if (com_debug) 1169 comstatus(sc, "comioctl "); 1170 #endif 1171 1172 return (error); 1173 } 1174 1175 integrate void 1176 com_schedrx(sc) 1177 struct com_softc *sc; 1178 { 1179 1180 sc->sc_rx_ready = 1; 1181 1182 /* Wake up the poller. */ 1183 #ifdef __GENERIC_SOFT_INTERRUPTS 1184 softintr_schedule(sc->sc_si); 1185 #else 1186 #ifndef __NO_SOFT_SERIAL_INTERRUPT 1187 setsoftserial(); 1188 #else 1189 if (!com_softintr_scheduled) { 1190 com_softintr_scheduled = 1; 1191 timeout(comsoft, NULL, 1); 1192 } 1193 #endif 1194 #endif 1195 } 1196 1197 void 1198 com_break(sc, onoff) 1199 struct com_softc *sc; 1200 int onoff; 1201 { 1202 1203 if (onoff) 1204 SET(sc->sc_lcr, LCR_SBREAK); 1205 else 1206 CLR(sc->sc_lcr, LCR_SBREAK); 1207 1208 if (!sc->sc_heldchange) { 1209 if (sc->sc_tx_busy) { 1210 sc->sc_heldtbc = sc->sc_tbc; 1211 sc->sc_tbc = 0; 1212 sc->sc_heldchange = 1; 1213 } else 1214 com_loadchannelregs(sc); 1215 } 1216 } 1217 1218 void 1219 com_modem(sc, onoff) 1220 struct com_softc *sc; 1221 int onoff; 1222 { 1223 1224 if (onoff) 1225 SET(sc->sc_mcr, sc->sc_mcr_dtr); 1226 else 1227 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 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 static u_char 1240 cflag2lcr(cflag) 1241 tcflag_t cflag; 1242 { 1243 u_char lcr = 0; 1244 1245 switch (ISSET(cflag, CSIZE)) { 1246 case CS5: 1247 SET(lcr, LCR_5BITS); 1248 break; 1249 case CS6: 1250 SET(lcr, LCR_6BITS); 1251 break; 1252 case CS7: 1253 SET(lcr, LCR_7BITS); 1254 break; 1255 case CS8: 1256 SET(lcr, LCR_8BITS); 1257 break; 1258 } 1259 if (ISSET(cflag, PARENB)) { 1260 SET(lcr, LCR_PENAB); 1261 if (!ISSET(cflag, PARODD)) 1262 SET(lcr, LCR_PEVEN); 1263 } 1264 if (ISSET(cflag, CSTOPB)) 1265 SET(lcr, LCR_STOPB); 1266 1267 return (lcr); 1268 } 1269 1270 int 1271 comparam(tp, t) 1272 struct tty *tp; 1273 struct termios *t; 1274 { 1275 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1276 int ospeed = comspeed(t->c_ospeed, sc->sc_frequency); 1277 u_char lcr; 1278 int s; 1279 1280 if (COM_ISALIVE(sc) == 0) 1281 return (EIO); 1282 1283 /* Check requested parameters. */ 1284 if (ospeed < 0) 1285 return (EINVAL); 1286 if (t->c_ispeed && t->c_ispeed != t->c_ospeed) 1287 return (EINVAL); 1288 1289 /* 1290 * For the console, always force CLOCAL and !HUPCL, so that the port 1291 * is always active. 1292 */ 1293 if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) || 1294 ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 1295 SET(t->c_cflag, CLOCAL); 1296 CLR(t->c_cflag, HUPCL); 1297 } 1298 1299 /* 1300 * If there were no changes, don't do anything. This avoids dropping 1301 * input and improves performance when all we did was frob things like 1302 * VMIN and VTIME. 1303 */ 1304 if (tp->t_ospeed == t->c_ospeed && 1305 tp->t_cflag == t->c_cflag) 1306 return (0); 1307 1308 lcr = ISSET(sc->sc_lcr, LCR_SBREAK) | cflag2lcr(t->c_cflag); 1309 1310 s = splserial(); 1311 1312 sc->sc_lcr = lcr; 1313 1314 /* 1315 * If we're not in a mode that assumes a connection is present, then 1316 * ignore carrier changes. 1317 */ 1318 if (ISSET(t->c_cflag, CLOCAL | MDMBUF)) 1319 sc->sc_msr_dcd = 0; 1320 else 1321 sc->sc_msr_dcd = MSR_DCD; 1322 /* 1323 * Set the flow control pins depending on the current flow control 1324 * mode. 1325 */ 1326 if (ISSET(t->c_cflag, CRTSCTS)) { 1327 sc->sc_mcr_dtr = MCR_DTR; 1328 sc->sc_mcr_rts = MCR_RTS; 1329 sc->sc_msr_cts = MSR_CTS; 1330 sc->sc_efr = EFR_AUTORTS | EFR_AUTOCTS; 1331 } else if (ISSET(t->c_cflag, MDMBUF)) { 1332 /* 1333 * For DTR/DCD flow control, make sure we don't toggle DTR for 1334 * carrier detection. 1335 */ 1336 sc->sc_mcr_dtr = 0; 1337 sc->sc_mcr_rts = MCR_DTR; 1338 sc->sc_msr_cts = MSR_DCD; 1339 sc->sc_efr = 0; 1340 } else { 1341 /* 1342 * If no flow control, then always set RTS. This will make 1343 * the other side happy if it mistakenly thinks we're doing 1344 * RTS/CTS flow control. 1345 */ 1346 sc->sc_mcr_dtr = MCR_DTR | MCR_RTS; 1347 sc->sc_mcr_rts = 0; 1348 sc->sc_msr_cts = 0; 1349 sc->sc_efr = 0; 1350 if (ISSET(sc->sc_mcr, MCR_DTR)) 1351 SET(sc->sc_mcr, MCR_RTS); 1352 else 1353 CLR(sc->sc_mcr, MCR_RTS); 1354 } 1355 sc->sc_msr_mask = sc->sc_msr_cts | sc->sc_msr_dcd; 1356 1357 #if 0 1358 if (ospeed == 0) 1359 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 1360 else 1361 SET(sc->sc_mcr, sc->sc_mcr_dtr); 1362 #endif 1363 1364 sc->sc_dlbl = ospeed; 1365 sc->sc_dlbh = ospeed >> 8; 1366 1367 /* 1368 * Set the FIFO threshold based on the receive speed. 1369 * 1370 * * If it's a low speed, it's probably a mouse or some other 1371 * interactive device, so set the threshold low. 1372 * * If it's a high speed, trim the trigger level down to prevent 1373 * overflows. 1374 * * Otherwise set it a bit higher. 1375 */ 1376 if (ISSET(sc->sc_hwflags, COM_HW_HAYESP)) 1377 sc->sc_fifo = FIFO_DMA_MODE | FIFO_ENABLE | FIFO_TRIGGER_8; 1378 else if (ISSET(sc->sc_hwflags, COM_HW_FIFO)) 1379 sc->sc_fifo = FIFO_ENABLE | 1380 (t->c_ospeed <= 1200 ? FIFO_TRIGGER_1 : 1381 t->c_ospeed <= 38400 ? FIFO_TRIGGER_8 : FIFO_TRIGGER_4); 1382 else 1383 sc->sc_fifo = 0; 1384 1385 /* And copy to tty. */ 1386 tp->t_ispeed = 0; 1387 tp->t_ospeed = t->c_ospeed; 1388 tp->t_cflag = t->c_cflag; 1389 1390 if (!sc->sc_heldchange) { 1391 if (sc->sc_tx_busy) { 1392 sc->sc_heldtbc = sc->sc_tbc; 1393 sc->sc_tbc = 0; 1394 sc->sc_heldchange = 1; 1395 } else 1396 com_loadchannelregs(sc); 1397 } 1398 1399 if (!ISSET(t->c_cflag, CHWFLOW)) { 1400 /* Disable the high water mark. */ 1401 sc->sc_r_hiwat = 0; 1402 sc->sc_r_lowat = 0; 1403 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1404 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1405 com_schedrx(sc); 1406 } 1407 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 1408 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 1409 com_hwiflow(sc); 1410 } 1411 } else { 1412 sc->sc_r_hiwat = com_rbuf_hiwat; 1413 sc->sc_r_lowat = com_rbuf_lowat; 1414 } 1415 1416 splx(s); 1417 1418 /* 1419 * Update the tty layer's idea of the carrier bit, in case we changed 1420 * CLOCAL or MDMBUF. We don't hang up here; we only do that by 1421 * explicit request. 1422 */ 1423 (void) (*linesw[tp->t_line].l_modem)(tp, ISSET(sc->sc_msr, MSR_DCD)); 1424 1425 #ifdef COM_DEBUG 1426 if (com_debug) 1427 comstatus(sc, "comparam "); 1428 #endif 1429 1430 if (!ISSET(t->c_cflag, CHWFLOW)) { 1431 if (sc->sc_tx_stopped) { 1432 sc->sc_tx_stopped = 0; 1433 comstart(tp); 1434 } 1435 } 1436 1437 return (0); 1438 } 1439 1440 void 1441 com_iflush(sc) 1442 struct com_softc *sc; 1443 { 1444 bus_space_tag_t iot = sc->sc_iot; 1445 bus_space_handle_t ioh = sc->sc_ioh; 1446 #ifdef DIAGNOSTIC 1447 int reg; 1448 #endif 1449 int timo; 1450 1451 #ifdef DIAGNOSTIC 1452 reg = 0xffff; 1453 #endif 1454 timo = 50000; 1455 /* flush any pending I/O */ 1456 while (ISSET(bus_space_read_1(iot, ioh, com_lsr), LSR_RXRDY) 1457 && --timo) 1458 #ifdef DIAGNOSTIC 1459 reg = 1460 #else 1461 (void) 1462 #endif 1463 bus_space_read_1(iot, ioh, com_data); 1464 #ifdef DIAGNOSTIC 1465 if (!timo) 1466 printf("%s: com_iflush timeout %02x\n", sc->sc_dev.dv_xname, 1467 reg); 1468 #endif 1469 } 1470 1471 void 1472 com_loadchannelregs(sc) 1473 struct com_softc *sc; 1474 { 1475 bus_space_tag_t iot = sc->sc_iot; 1476 bus_space_handle_t ioh = sc->sc_ioh; 1477 1478 /* XXXXX necessary? */ 1479 com_iflush(sc); 1480 1481 bus_space_write_1(iot, ioh, com_ier, 0); 1482 1483 if (ISSET(sc->sc_hwflags, COM_HW_FLOW)) { 1484 bus_space_write_1(iot, ioh, com_lcr, LCR_EERS); 1485 bus_space_write_1(iot, ioh, com_efr, sc->sc_efr); 1486 } 1487 bus_space_write_1(iot, ioh, com_lcr, sc->sc_lcr | LCR_DLAB); 1488 bus_space_write_1(iot, ioh, com_dlbl, sc->sc_dlbl); 1489 bus_space_write_1(iot, ioh, com_dlbh, sc->sc_dlbh); 1490 bus_space_write_1(iot, ioh, com_lcr, sc->sc_lcr); 1491 bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr_active = sc->sc_mcr); 1492 bus_space_write_1(iot, ioh, com_fifo, sc->sc_fifo); 1493 1494 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1495 } 1496 1497 int 1498 comhwiflow(tp, block) 1499 struct tty *tp; 1500 int block; 1501 { 1502 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1503 int s; 1504 1505 if (COM_ISALIVE(sc) == 0) 1506 return (0); 1507 1508 if (sc->sc_mcr_rts == 0) 1509 return (0); 1510 1511 s = splserial(); 1512 if (block) { 1513 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1514 SET(sc->sc_rx_flags, RX_TTY_BLOCKED); 1515 com_hwiflow(sc); 1516 } 1517 } else { 1518 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1519 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1520 com_schedrx(sc); 1521 } 1522 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1523 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED); 1524 com_hwiflow(sc); 1525 } 1526 } 1527 splx(s); 1528 return (1); 1529 } 1530 1531 /* 1532 * (un)block input via hw flowcontrol 1533 */ 1534 void 1535 com_hwiflow(sc) 1536 struct com_softc *sc; 1537 { 1538 bus_space_tag_t iot = sc->sc_iot; 1539 bus_space_handle_t ioh = sc->sc_ioh; 1540 1541 if (sc->sc_mcr_rts == 0) 1542 return; 1543 1544 if (ISSET(sc->sc_rx_flags, RX_ANY_BLOCK)) { 1545 CLR(sc->sc_mcr, sc->sc_mcr_rts); 1546 CLR(sc->sc_mcr_active, sc->sc_mcr_rts); 1547 } else { 1548 SET(sc->sc_mcr, sc->sc_mcr_rts); 1549 SET(sc->sc_mcr_active, sc->sc_mcr_rts); 1550 } 1551 bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr_active); 1552 } 1553 1554 1555 void 1556 comstart(tp) 1557 struct tty *tp; 1558 { 1559 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1560 bus_space_tag_t iot = sc->sc_iot; 1561 bus_space_handle_t ioh = sc->sc_ioh; 1562 int s; 1563 1564 if (COM_ISALIVE(sc) == 0) 1565 return; 1566 1567 s = spltty(); 1568 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 1569 goto out; 1570 if (sc->sc_tx_stopped) 1571 goto out; 1572 1573 if (tp->t_outq.c_cc <= tp->t_lowat) { 1574 if (ISSET(tp->t_state, TS_ASLEEP)) { 1575 CLR(tp->t_state, TS_ASLEEP); 1576 wakeup(&tp->t_outq); 1577 } 1578 selwakeup(&tp->t_wsel); 1579 if (tp->t_outq.c_cc == 0) 1580 goto out; 1581 } 1582 1583 /* Grab the first contiguous region of buffer space. */ 1584 { 1585 u_char *tba; 1586 int tbc; 1587 1588 tba = tp->t_outq.c_cf; 1589 tbc = ndqb(&tp->t_outq, 0); 1590 1591 (void)splserial(); 1592 1593 sc->sc_tba = tba; 1594 sc->sc_tbc = tbc; 1595 } 1596 1597 SET(tp->t_state, TS_BUSY); 1598 sc->sc_tx_busy = 1; 1599 1600 /* Enable transmit completion interrupts if necessary. */ 1601 if (!ISSET(sc->sc_ier, IER_ETXRDY)) { 1602 SET(sc->sc_ier, IER_ETXRDY); 1603 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1604 } 1605 1606 /* Output the first chunk of the contiguous buffer. */ 1607 { 1608 int n; 1609 1610 n = sc->sc_tbc; 1611 if (n > sc->sc_fifolen) 1612 n = sc->sc_fifolen; 1613 bus_space_write_multi_1(iot, ioh, com_data, sc->sc_tba, n); 1614 sc->sc_tbc -= n; 1615 sc->sc_tba += n; 1616 } 1617 out: 1618 splx(s); 1619 return; 1620 } 1621 1622 /* 1623 * Stop output on a line. 1624 */ 1625 void 1626 comstop(tp, flag) 1627 struct tty *tp; 1628 int flag; 1629 { 1630 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1631 int s; 1632 1633 s = splserial(); 1634 if (ISSET(tp->t_state, TS_BUSY)) { 1635 /* Stop transmitting at the next chunk. */ 1636 sc->sc_tbc = 0; 1637 sc->sc_heldtbc = 0; 1638 if (!ISSET(tp->t_state, TS_TTSTOP)) 1639 SET(tp->t_state, TS_FLUSH); 1640 } 1641 splx(s); 1642 } 1643 1644 void 1645 comdiag(arg) 1646 void *arg; 1647 { 1648 struct com_softc *sc = arg; 1649 int overflows, floods; 1650 int s; 1651 1652 s = splserial(); 1653 overflows = sc->sc_overflows; 1654 sc->sc_overflows = 0; 1655 floods = sc->sc_floods; 1656 sc->sc_floods = 0; 1657 sc->sc_errors = 0; 1658 splx(s); 1659 1660 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1661 sc->sc_dev.dv_xname, 1662 overflows, overflows == 1 ? "" : "s", 1663 floods, floods == 1 ? "" : "s"); 1664 } 1665 1666 integrate void 1667 com_rxsoft(sc, tp) 1668 struct com_softc *sc; 1669 struct tty *tp; 1670 { 1671 int (*rint) __P((int c, struct tty *tp)) = linesw[tp->t_line].l_rint; 1672 u_char *get, *end; 1673 u_int cc, scc; 1674 u_char lsr; 1675 int code; 1676 int s; 1677 1678 end = sc->sc_ebuf; 1679 get = sc->sc_rbget; 1680 scc = cc = com_rbuf_size - sc->sc_rbavail; 1681 1682 if (cc == com_rbuf_size) { 1683 sc->sc_floods++; 1684 if (sc->sc_errors++ == 0) 1685 timeout(comdiag, sc, 60 * hz); 1686 } 1687 1688 while (cc) { 1689 code = get[0]; 1690 lsr = get[1]; 1691 if (ISSET(lsr, LSR_OE | LSR_BI | LSR_FE | LSR_PE)) { 1692 if (ISSET(lsr, LSR_OE)) { 1693 sc->sc_overflows++; 1694 if (sc->sc_errors++ == 0) 1695 timeout(comdiag, sc, 60 * hz); 1696 } 1697 if (ISSET(lsr, LSR_BI | LSR_FE)) 1698 SET(code, TTY_FE); 1699 if (ISSET(lsr, LSR_PE)) 1700 SET(code, TTY_PE); 1701 } 1702 if ((*rint)(code, tp) == -1) { 1703 /* 1704 * The line discipline's buffer is out of space. 1705 */ 1706 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1707 /* 1708 * We're either not using flow control, or the 1709 * line discipline didn't tell us to block for 1710 * some reason. Either way, we have no way to 1711 * know when there's more space available, so 1712 * just drop the rest of the data. 1713 */ 1714 get += cc << 1; 1715 if (get >= end) 1716 get -= com_rbuf_size << 1; 1717 cc = 0; 1718 } else { 1719 /* 1720 * Don't schedule any more receive processing 1721 * until the line discipline tells us there's 1722 * space available (through comhwiflow()). 1723 * Leave the rest of the data in the input 1724 * buffer. 1725 */ 1726 SET(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1727 } 1728 break; 1729 } 1730 get += 2; 1731 if (get >= end) 1732 get = sc->sc_rbuf; 1733 cc--; 1734 } 1735 1736 if (cc != scc) { 1737 sc->sc_rbget = get; 1738 s = splserial(); 1739 cc = sc->sc_rbavail += scc - cc; 1740 /* Buffers should be ok again, release possible block. */ 1741 if (cc >= sc->sc_r_lowat) { 1742 if (ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1743 CLR(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1744 SET(sc->sc_ier, IER_ERXRDY); 1745 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 1746 } 1747 if (ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED)) { 1748 CLR(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1749 com_hwiflow(sc); 1750 } 1751 } 1752 splx(s); 1753 } 1754 } 1755 1756 integrate void 1757 com_txsoft(sc, tp) 1758 struct com_softc *sc; 1759 struct tty *tp; 1760 { 1761 1762 CLR(tp->t_state, TS_BUSY); 1763 if (ISSET(tp->t_state, TS_FLUSH)) 1764 CLR(tp->t_state, TS_FLUSH); 1765 else 1766 ndflush(&tp->t_outq, (int)(sc->sc_tba - tp->t_outq.c_cf)); 1767 (*linesw[tp->t_line].l_start)(tp); 1768 } 1769 1770 integrate void 1771 com_stsoft(sc, tp) 1772 struct com_softc *sc; 1773 struct tty *tp; 1774 { 1775 u_char msr, delta; 1776 int s; 1777 1778 s = splserial(); 1779 msr = sc->sc_msr; 1780 delta = sc->sc_msr_delta; 1781 sc->sc_msr_delta = 0; 1782 splx(s); 1783 1784 if (ISSET(delta, sc->sc_msr_dcd)) { 1785 /* 1786 * Inform the tty layer that carrier detect changed. 1787 */ 1788 (void) (*linesw[tp->t_line].l_modem)(tp, ISSET(msr, MSR_DCD)); 1789 } 1790 1791 if (ISSET(delta, sc->sc_msr_cts)) { 1792 /* Block or unblock output according to flow control. */ 1793 if (ISSET(msr, sc->sc_msr_cts)) { 1794 sc->sc_tx_stopped = 0; 1795 (*linesw[tp->t_line].l_start)(tp); 1796 } else { 1797 sc->sc_tx_stopped = 1; 1798 } 1799 } 1800 1801 #ifdef COM_DEBUG 1802 if (com_debug) 1803 comstatus(sc, "com_stsoft"); 1804 #endif 1805 } 1806 1807 #ifdef __GENERIC_SOFT_INTERRUPTS 1808 void 1809 comsoft(arg) 1810 void *arg; 1811 { 1812 struct com_softc *sc = arg; 1813 struct tty *tp; 1814 1815 if (COM_ISALIVE(sc) == 0) 1816 return; 1817 1818 { 1819 #else 1820 void 1821 #ifndef __NO_SOFT_SERIAL_INTERRUPT 1822 comsoft() 1823 #else 1824 comsoft(arg) 1825 void *arg; 1826 #endif 1827 { 1828 struct com_softc *sc; 1829 struct tty *tp; 1830 int unit; 1831 #ifdef __NO_SOFT_SERIAL_INTERRUPT 1832 int s; 1833 1834 s = splsoftserial(); 1835 com_softintr_scheduled = 0; 1836 #endif 1837 1838 for (unit = 0; unit < com_cd.cd_ndevs; unit++) { 1839 sc = com_cd.cd_devs[unit]; 1840 if (sc == NULL || !ISSET(sc->sc_hwflags, COM_HW_DEV_OK)) 1841 continue; 1842 1843 if (COM_ISALIVE(sc) == 0) 1844 continue; 1845 1846 tp = sc->sc_tty; 1847 if (tp == NULL) 1848 continue; 1849 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) 1850 continue; 1851 #endif 1852 tp = sc->sc_tty; 1853 1854 if (sc->sc_rx_ready) { 1855 sc->sc_rx_ready = 0; 1856 com_rxsoft(sc, tp); 1857 } 1858 1859 if (sc->sc_st_check) { 1860 sc->sc_st_check = 0; 1861 com_stsoft(sc, tp); 1862 } 1863 1864 if (sc->sc_tx_done) { 1865 sc->sc_tx_done = 0; 1866 com_txsoft(sc, tp); 1867 } 1868 } 1869 1870 #ifndef __GENERIC_SOFT_INTERRUPTS 1871 #ifdef __NO_SOFT_SERIAL_INTERRUPT 1872 splx(s); 1873 #endif 1874 #endif 1875 } 1876 1877 #ifdef __ALIGN_BRACKET_LEVEL_FOR_CTAGS 1878 /* there has got to be a better way to do comsoft() */ 1879 }} 1880 #endif 1881 1882 int 1883 comintr(arg) 1884 void *arg; 1885 { 1886 struct com_softc *sc = arg; 1887 bus_space_tag_t iot = sc->sc_iot; 1888 bus_space_handle_t ioh = sc->sc_ioh; 1889 u_char *put, *end; 1890 u_int cc; 1891 u_char lsr, iir; 1892 1893 if (COM_ISALIVE(sc) == 0) 1894 return (0); 1895 1896 iir = bus_space_read_1(iot, ioh, com_iir); 1897 if (ISSET(iir, IIR_NOPEND)) 1898 return (0); 1899 1900 end = sc->sc_ebuf; 1901 put = sc->sc_rbput; 1902 cc = sc->sc_rbavail; 1903 1904 do { 1905 u_char msr, delta; 1906 1907 lsr = bus_space_read_1(iot, ioh, com_lsr); 1908 #if defined(DDB) || defined(KGDB) 1909 if (ISSET(lsr, LSR_BI)) { 1910 #ifdef DDB 1911 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 1912 console_debugger(); 1913 continue; 1914 } 1915 #endif 1916 #ifdef KGDB 1917 if (ISSET(sc->sc_hwflags, COM_HW_KGDB)) { 1918 kgdb_connect(1); 1919 continue; 1920 } 1921 #endif 1922 } 1923 #endif /* DDB || KGDB */ 1924 1925 if (ISSET(lsr, LSR_RCV_MASK) && 1926 !ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1927 while (cc > 0) { 1928 put[0] = bus_space_read_1(iot, ioh, com_data); 1929 put[1] = lsr; 1930 put += 2; 1931 if (put >= end) 1932 put = sc->sc_rbuf; 1933 cc--; 1934 1935 lsr = bus_space_read_1(iot, ioh, com_lsr); 1936 if (!ISSET(lsr, LSR_RCV_MASK)) 1937 break; 1938 } 1939 1940 /* 1941 * Current string of incoming characters ended because 1942 * no more data was available or we ran out of space. 1943 * Schedule a receive event if any data was received. 1944 * If we're out of space, turn off receive interrupts. 1945 */ 1946 sc->sc_rbput = put; 1947 sc->sc_rbavail = cc; 1948 if (!ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) 1949 sc->sc_rx_ready = 1; 1950 1951 /* 1952 * See if we are in danger of overflowing a buffer. If 1953 * so, use hardware flow control to ease the pressure. 1954 */ 1955 if (!ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED) && 1956 cc < sc->sc_r_hiwat) { 1957 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1958 com_hwiflow(sc); 1959 } 1960 1961 /* 1962 * If we're out of space, disable receive interrupts 1963 * until the queue has drained a bit. 1964 */ 1965 if (!cc) { 1966 SET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1967 CLR(sc->sc_ier, IER_ERXRDY); 1968 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1969 } 1970 } else { 1971 if ((iir & IIR_IMASK) == IIR_RXRDY) { 1972 bus_space_write_1(iot, ioh, com_ier, 0); 1973 delay(10); 1974 bus_space_write_1(iot, ioh, com_ier,sc->sc_ier); 1975 iir = IIR_NOPEND; 1976 continue; 1977 } 1978 } 1979 1980 msr = bus_space_read_1(iot, ioh, com_msr); 1981 delta = msr ^ sc->sc_msr; 1982 sc->sc_msr = msr; 1983 if (ISSET(delta, sc->sc_msr_mask)) { 1984 SET(sc->sc_msr_delta, delta); 1985 1986 /* 1987 * Pulse-per-second clock signal on edge of DCD? 1988 */ 1989 if (ISSET(delta, sc->sc_ppsmask)) { 1990 struct timeval tv; 1991 if (ISSET(msr, sc->sc_ppsmask) == 1992 sc->sc_ppsassert) { 1993 /* XXX nanotime() */ 1994 microtime(&tv); 1995 TIMEVAL_TO_TIMESPEC(&tv, 1996 &sc->ppsinfo.assert_timestamp); 1997 if (sc->ppsparam.mode & PPS_OFFSETASSERT) { 1998 timespecadd(&sc->ppsinfo.assert_timestamp, 1999 &sc->ppsparam.assert_offset, 2000 &sc->ppsinfo.assert_timestamp); 2001 TIMESPEC_TO_TIMEVAL(&tv, &sc->ppsinfo.assert_timestamp); 2002 } 2003 2004 #ifdef PPS_SYNC 2005 if (sc->ppsparam.mode & PPS_HARDPPSONASSERT) 2006 hardpps(&tv, tv.tv_usec); 2007 #endif 2008 sc->ppsinfo.assert_sequence++; 2009 sc->ppsinfo.current_mode = 2010 sc->ppsparam.mode; 2011 2012 } else if (ISSET(msr, sc->sc_ppsmask) == 2013 sc->sc_ppsclear) { 2014 /* XXX nanotime() */ 2015 microtime(&tv); 2016 TIMEVAL_TO_TIMESPEC(&tv, 2017 &sc->ppsinfo.clear_timestamp); 2018 if (sc->ppsparam.mode & PPS_OFFSETCLEAR) { 2019 timespecadd(&sc->ppsinfo.clear_timestamp, 2020 &sc->ppsparam.clear_offset, 2021 &sc->ppsinfo.clear_timestamp); 2022 TIMESPEC_TO_TIMEVAL(&tv, &sc->ppsinfo.clear_timestamp); 2023 } 2024 2025 #ifdef PPS_SYNC 2026 if (sc->ppsparam.mode & PPS_HARDPPSONCLEAR) 2027 hardpps(&tv, tv.tv_usec); 2028 #endif 2029 sc->ppsinfo.clear_sequence++; 2030 sc->ppsinfo.current_mode = 2031 sc->ppsparam.mode; 2032 } 2033 } 2034 2035 /* 2036 * Stop output immediately if we lose the output 2037 * flow control signal or carrier detect. 2038 */ 2039 if (ISSET(~msr, sc->sc_msr_mask)) { 2040 sc->sc_tbc = 0; 2041 sc->sc_heldtbc = 0; 2042 #ifdef COM_DEBUG 2043 if (com_debug) 2044 comstatus(sc, "comintr "); 2045 #endif 2046 } 2047 2048 sc->sc_st_check = 1; 2049 } 2050 } while (!ISSET((iir = bus_space_read_1(iot, ioh, com_iir)), IIR_NOPEND)); 2051 2052 /* 2053 * Done handling any receive interrupts. See if data can be 2054 * transmitted as well. Schedule tx done event if no data left 2055 * and tty was marked busy. 2056 */ 2057 if (ISSET(lsr, LSR_TXRDY)) { 2058 /* 2059 * If we've delayed a parameter change, do it now, and restart 2060 * output. 2061 */ 2062 if (sc->sc_heldchange) { 2063 com_loadchannelregs(sc); 2064 sc->sc_heldchange = 0; 2065 sc->sc_tbc = sc->sc_heldtbc; 2066 sc->sc_heldtbc = 0; 2067 } 2068 2069 /* Output the next chunk of the contiguous buffer, if any. */ 2070 if (sc->sc_tbc > 0) { 2071 int n; 2072 2073 n = sc->sc_tbc; 2074 if (n > sc->sc_fifolen) 2075 n = sc->sc_fifolen; 2076 bus_space_write_multi_1(iot, ioh, com_data, sc->sc_tba, n); 2077 sc->sc_tbc -= n; 2078 sc->sc_tba += n; 2079 } else { 2080 /* Disable transmit completion interrupts if necessary. */ 2081 if (ISSET(sc->sc_ier, IER_ETXRDY)) { 2082 CLR(sc->sc_ier, IER_ETXRDY); 2083 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 2084 } 2085 if (sc->sc_tx_busy) { 2086 sc->sc_tx_busy = 0; 2087 sc->sc_tx_done = 1; 2088 } 2089 } 2090 } 2091 2092 /* Wake up the poller. */ 2093 #ifdef __GENERIC_SOFT_INTERRUPTS 2094 softintr_schedule(sc->sc_si); 2095 #else 2096 #ifndef __NO_SOFT_SERIAL_INTERRUPT 2097 setsoftserial(); 2098 #else 2099 if (!com_softintr_scheduled) { 2100 com_softintr_scheduled = 1; 2101 timeout(comsoft, NULL, 1); 2102 } 2103 #endif 2104 #endif 2105 2106 #if NRND > 0 && defined(RND_COM) 2107 rnd_add_uint32(&sc->rnd_source, iir | lsr); 2108 #endif 2109 2110 return (1); 2111 } 2112 2113 /* 2114 * The following functions are polled getc and putc routines, shared 2115 * by the console and kgdb glue. 2116 */ 2117 2118 int 2119 com_common_getc(iot, ioh) 2120 bus_space_tag_t iot; 2121 bus_space_handle_t ioh; 2122 { 2123 int s = splserial(); 2124 u_char stat, c; 2125 2126 /* block until a character becomes available */ 2127 while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_RXRDY)) 2128 ; 2129 2130 c = bus_space_read_1(iot, ioh, com_data); 2131 stat = bus_space_read_1(iot, ioh, com_iir); 2132 splx(s); 2133 return (c); 2134 } 2135 2136 void 2137 com_common_putc(iot, ioh, c) 2138 bus_space_tag_t iot; 2139 bus_space_handle_t ioh; 2140 int c; 2141 { 2142 int s = splserial(); 2143 u_char stat; 2144 int timo; 2145 2146 /* wait for any pending transmission to finish */ 2147 timo = 50000; 2148 while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_TXRDY) 2149 && --timo) 2150 ; 2151 2152 bus_space_write_1(iot, ioh, com_data, c); 2153 /* wait for this transmission to complete */ 2154 timo = 1500000; 2155 while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_TXRDY) 2156 && --timo) 2157 ; 2158 2159 /* clear any interrupts generated by this transmission */ 2160 stat = bus_space_read_1(iot, ioh, com_iir); 2161 splx(s); 2162 } 2163 2164 /* 2165 * Initialize UART to known state. 2166 */ 2167 int 2168 cominit(iot, iobase, rate, frequency, cflag, iohp) 2169 bus_space_tag_t iot; 2170 int iobase; 2171 int rate, frequency; 2172 tcflag_t cflag; 2173 bus_space_handle_t *iohp; 2174 { 2175 bus_space_handle_t ioh; 2176 2177 if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) 2178 return (ENOMEM); /* ??? */ 2179 2180 bus_space_write_1(iot, ioh, com_lcr, LCR_EERS); 2181 bus_space_write_1(iot, ioh, com_efr, 0); 2182 bus_space_write_1(iot, ioh, com_lcr, LCR_DLAB); 2183 rate = comspeed(rate, frequency); 2184 bus_space_write_1(iot, ioh, com_dlbl, rate); 2185 bus_space_write_1(iot, ioh, com_dlbh, rate >> 8); 2186 bus_space_write_1(iot, ioh, com_lcr, cflag2lcr(cflag)); 2187 bus_space_write_1(iot, ioh, com_mcr, 0); 2188 bus_space_write_1(iot, ioh, com_fifo, 2189 FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_1); 2190 bus_space_write_1(iot, ioh, com_ier, 0); 2191 2192 *iohp = ioh; 2193 return (0); 2194 } 2195 2196 /* 2197 * Following are all routines needed for COM to act as console 2198 */ 2199 2200 int 2201 comcnattach(iot, iobase, rate, frequency, cflag) 2202 bus_space_tag_t iot; 2203 int iobase; 2204 int rate, frequency; 2205 tcflag_t cflag; 2206 { 2207 int res; 2208 static struct consdev comcons = { 2209 NULL, NULL, comcngetc, comcnputc, comcnpollc, NODEV, CN_NORMAL 2210 }; 2211 2212 res = cominit(iot, iobase, rate, frequency, cflag, &comconsioh); 2213 if (res) 2214 return (res); 2215 2216 cn_tab = &comcons; 2217 2218 comconstag = iot; 2219 comconsaddr = iobase; 2220 comconsrate = rate; 2221 comconscflag = cflag; 2222 2223 return (0); 2224 } 2225 2226 int 2227 comcngetc(dev) 2228 dev_t dev; 2229 { 2230 2231 return (com_common_getc(comconstag, comconsioh)); 2232 } 2233 2234 /* 2235 * Console kernel output character routine. 2236 */ 2237 void 2238 comcnputc(dev, c) 2239 dev_t dev; 2240 int c; 2241 { 2242 2243 com_common_putc(comconstag, comconsioh, c); 2244 } 2245 2246 void 2247 comcnpollc(dev, on) 2248 dev_t dev; 2249 int on; 2250 { 2251 2252 } 2253 2254 #ifdef KGDB 2255 int 2256 com_kgdb_attach(iot, iobase, rate, frequency, cflag) 2257 bus_space_tag_t iot; 2258 int iobase; 2259 int rate, frequency; 2260 tcflag_t cflag; 2261 { 2262 int res; 2263 2264 if (iot == comconstag && iobase == comconsaddr) 2265 return (EBUSY); /* cannot share with console */ 2266 2267 res = cominit(iot, iobase, rate, frequency, cflag, &com_kgdb_ioh); 2268 if (res) 2269 return (res); 2270 2271 kgdb_attach(com_kgdb_getc, com_kgdb_putc, NULL); 2272 kgdb_dev = 123; /* unneeded, only to satisfy some tests */ 2273 2274 com_kgdb_iot = iot; 2275 com_kgdb_addr = iobase; 2276 2277 return (0); 2278 } 2279 2280 /* ARGSUSED */ 2281 int 2282 com_kgdb_getc(arg) 2283 void *arg; 2284 { 2285 2286 return (com_common_getc(com_kgdb_iot, com_kgdb_ioh)); 2287 } 2288 2289 /* ARGSUSED */ 2290 void 2291 com_kgdb_putc(arg, c) 2292 void *arg; 2293 int c; 2294 { 2295 2296 return (com_common_putc(com_kgdb_iot, com_kgdb_ioh, c)); 2297 } 2298 #endif /* KGDB */ 2299 2300 /* helper function to identify the com ports used by 2301 console or KGDB (and not yet autoconf attached) */ 2302 int 2303 com_is_console(iot, iobase, ioh) 2304 bus_space_tag_t iot; 2305 int iobase; 2306 bus_space_handle_t *ioh; 2307 { 2308 bus_space_handle_t help; 2309 2310 if (!comconsattached && 2311 iot == comconstag && iobase == comconsaddr) 2312 help = comconsioh; 2313 #ifdef KGDB 2314 else if (!com_kgdb_attached && 2315 iot == com_kgdb_iot && iobase == com_kgdb_addr) 2316 help = com_kgdb_ioh; 2317 #endif 2318 else 2319 return (0); 2320 2321 if (ioh) 2322 *ioh = help; 2323 return (1); 2324 } 2325
Indexes created Wed Sep 24 05:09:52 GMT 2025