com.c revision 1.159.2.4
1 /* $NetBSD: com.c,v 1.159.2.4 2000/02/08 22:14:27 he 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 #define BR BUS_SPACE_BARRIER_READ 227 #define BW BUS_SPACE_BARRIER_WRITE 228 #define COM_BARRIER(t, h, f) bus_space_barrier((t), (h), 0, COM_NPORTS, (f)) 229 230 int 231 comspeed(speed, frequency) 232 long speed, frequency; 233 { 234 #define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */ 235 236 int x, err; 237 238 #if 0 239 if (speed == 0) 240 return (0); 241 #endif 242 if (speed <= 0) 243 return (-1); 244 x = divrnd(frequency / 16, speed); 245 if (x <= 0) 246 return (-1); 247 err = divrnd(((quad_t)frequency) * 1000 / 16, speed * x) - 1000; 248 if (err < 0) 249 err = -err; 250 if (err > COM_TOLERANCE) 251 return (-1); 252 return (x); 253 254 #undef divrnd(n, q) 255 } 256 257 #ifdef COM_DEBUG 258 int com_debug = 0; 259 260 void comstatus __P((struct com_softc *, char *)); 261 void 262 comstatus(sc, str) 263 struct com_softc *sc; 264 char *str; 265 { 266 struct tty *tp = sc->sc_tty; 267 268 printf("%s: %s %sclocal %sdcd %sts_carr_on %sdtr %stx_stopped\n", 269 sc->sc_dev.dv_xname, str, 270 ISSET(tp->t_cflag, CLOCAL) ? "+" : "-", 271 ISSET(sc->sc_msr, MSR_DCD) ? "+" : "-", 272 ISSET(tp->t_state, TS_CARR_ON) ? "+" : "-", 273 ISSET(sc->sc_mcr, MCR_DTR) ? "+" : "-", 274 sc->sc_tx_stopped ? "+" : "-"); 275 276 printf("%s: %s %scrtscts %scts %sts_ttstop %srts %xrx_flags\n", 277 sc->sc_dev.dv_xname, str, 278 ISSET(tp->t_cflag, CRTSCTS) ? "+" : "-", 279 ISSET(sc->sc_msr, MSR_CTS) ? "+" : "-", 280 ISSET(tp->t_state, TS_TTSTOP) ? "+" : "-", 281 ISSET(sc->sc_mcr, MCR_RTS) ? "+" : "-", 282 sc->sc_rx_flags); 283 } 284 #endif 285 286 int 287 comprobe1(iot, ioh) 288 bus_space_tag_t iot; 289 bus_space_handle_t ioh; 290 { 291 292 /* force access to id reg */ 293 bus_space_write_1(iot, ioh, com_lcr, LCR_8BITS); 294 bus_space_write_1(iot, ioh, com_iir, 0); 295 if ((bus_space_read_1(iot, ioh, com_lcr) != LCR_8BITS) || 296 (bus_space_read_1(iot, ioh, com_iir) & 0x38)) 297 return (0); 298 299 return (1); 300 } 301 302 #ifdef COM_HAYESP 303 int 304 comprobeHAYESP(hayespioh, sc) 305 bus_space_handle_t hayespioh; 306 struct com_softc *sc; 307 { 308 char val, dips; 309 int combaselist[] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8 }; 310 bus_space_tag_t iot = sc->sc_iot; 311 312 /* 313 * Hayes ESP cards have two iobases. One is for compatibility with 314 * 16550 serial chips, and at the same ISA PC base addresses. The 315 * other is for ESP-specific enhanced features, and lies at a 316 * different addressing range entirely (0x140, 0x180, 0x280, or 0x300). 317 */ 318 319 /* Test for ESP signature */ 320 if ((bus_space_read_1(iot, hayespioh, 0) & 0xf3) == 0) 321 return (0); 322 323 /* 324 * ESP is present at ESP enhanced base address; unknown com port 325 */ 326 327 /* Get the dip-switch configurations */ 328 bus_space_write_1(iot, hayespioh, HAYESP_CMD1, HAYESP_GETDIPS); 329 dips = bus_space_read_1(iot, hayespioh, HAYESP_STATUS1); 330 331 /* Determine which com port this ESP card services: bits 0,1 of */ 332 /* dips is the port # (0-3); combaselist[val] is the com_iobase */ 333 if (sc->sc_iobase != combaselist[dips & 0x03]) 334 return (0); 335 336 printf(": ESP"); 337 338 /* Check ESP Self Test bits. */ 339 /* Check for ESP version 2.0: bits 4,5,6 == 010 */ 340 bus_space_write_1(iot, hayespioh, HAYESP_CMD1, HAYESP_GETTEST); 341 val = bus_space_read_1(iot, hayespioh, HAYESP_STATUS1); /* Clear reg1 */ 342 val = bus_space_read_1(iot, hayespioh, HAYESP_STATUS2); 343 if ((val & 0x70) < 0x20) { 344 printf("-old (%o)", val & 0x70); 345 /* we do not support the necessary features */ 346 return (0); 347 } 348 349 /* Check for ability to emulate 16550: bit 8 == 1 */ 350 if ((dips & 0x80) == 0) { 351 printf(" slave"); 352 /* XXX Does slave really mean no 16550 support?? */ 353 return (0); 354 } 355 356 /* 357 * If we made it this far, we are a full-featured ESP v2.0 (or 358 * better), at the correct com port address. 359 */ 360 361 SET(sc->sc_hwflags, COM_HW_HAYESP); 362 printf(", 1024 byte fifo\n"); 363 return (1); 364 } 365 #endif 366 367 #if defined(DDB) || defined(KGDB) 368 static void 369 com_enable_debugport(sc) 370 struct com_softc *sc; 371 { 372 int s; 373 374 /* Turn on line break interrupt, set carrier. */ 375 s = splserial(); 376 sc->sc_ier = IER_ERXRDY; 377 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 378 SET(sc->sc_mcr, MCR_DTR | MCR_RTS); 379 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_mcr, sc->sc_mcr); 380 splx(s); 381 } 382 #endif 383 384 void 385 com_attach_subr(sc) 386 struct com_softc *sc; 387 { 388 int iobase = sc->sc_iobase; 389 bus_space_tag_t iot = sc->sc_iot; 390 bus_space_handle_t ioh = sc->sc_ioh; 391 struct tty *tp; 392 #ifdef COM16650 393 u_int8_t lcr; 394 #endif 395 #ifdef COM_HAYESP 396 int hayesp_ports[] = { 0x140, 0x180, 0x280, 0x300, 0 }; 397 int *hayespp; 398 #endif 399 400 /* Disable interrupts before configuring the device. */ 401 sc->sc_ier = 0; 402 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 403 404 if (iot == comconstag && iobase == comconsaddr) { 405 comconsattached = 1; 406 407 /* Make sure the console is always "hardwired". */ 408 delay(1000); /* wait for output to finish */ 409 SET(sc->sc_hwflags, COM_HW_CONSOLE); 410 SET(sc->sc_swflags, TIOCFLAG_SOFTCAR); 411 } 412 413 #ifdef COM_HAYESP 414 /* Look for a Hayes ESP board. */ 415 for (hayespp = hayesp_ports; *hayespp != 0; hayespp++) { 416 bus_space_handle_t hayespioh; 417 418 #define HAYESP_NPORTS 8 /* XXX XXX XXX ??? ??? ??? */ 419 if (bus_space_map(iot, *hayespp, HAYESP_NPORTS, 0, &hayespioh)) 420 continue; 421 if (comprobeHAYESP(hayespioh, sc)) { 422 sc->sc_hayespioh = hayespioh; 423 sc->sc_fifolen = 1024; 424 425 break; 426 } 427 bus_space_unmap(iot, hayespioh, HAYESP_NPORTS); 428 } 429 /* No ESP; look for other things. */ 430 if (!ISSET(sc->sc_hwflags, COM_HW_HAYESP)) { 431 #endif 432 sc->sc_fifolen = 1; 433 /* look for a NS 16550AF UART with FIFOs */ 434 bus_space_write_1(iot, ioh, com_fifo, 435 FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_14); 436 delay(100); 437 if (ISSET(bus_space_read_1(iot, ioh, com_iir), IIR_FIFO_MASK) 438 == IIR_FIFO_MASK) 439 if (ISSET(bus_space_read_1(iot, ioh, com_fifo), FIFO_TRIGGER_14) 440 == FIFO_TRIGGER_14) { 441 SET(sc->sc_hwflags, COM_HW_FIFO); 442 443 #ifdef COM16650 444 /* 445 * IIR changes into the EFR if LCR is set to LCR_EERS 446 * on 16650s. We also know IIR != 0 at this point. 447 * Write 0 into the EFR, and read it. If the result 448 * is 0, we have a 16650. 449 * 450 * Older 16650s were broken; the test to detect them 451 * is taken from the Linux driver. Apparently 452 * setting DLAB enable gives access to the EFR on 453 * these chips. 454 */ 455 lcr = bus_space_read_1(iot, ioh, com_lcr); 456 bus_space_write_1(iot, ioh, com_lcr, LCR_EERS); 457 bus_space_write_1(iot, ioh, com_efr, 0); 458 if (bus_space_read_1(iot, ioh, com_efr) == 0) { 459 bus_space_write_1(iot, ioh, com_lcr, 460 lcr | LCR_DLAB); 461 if (bus_space_read_1(iot, ioh, com_efr) == 0) { 462 CLR(sc->sc_hwflags, COM_HW_FIFO); 463 sc->sc_fifolen = 0; 464 } else { 465 SET(sc->sc_hwflags, COM_HW_FLOW); 466 sc->sc_fifolen = 32; 467 } 468 } else 469 #endif 470 sc->sc_fifolen = 16; 471 472 #ifdef COM16650 473 bus_space_write_1(iot, ioh, com_lcr, lcr); 474 if (sc->sc_fifolen == 0) 475 printf(": st16650, broken fifo\n"); 476 else if (sc->sc_fifolen == 32) 477 printf(": st16650a, working fifo\n"); 478 else 479 #endif 480 printf(": ns16550a, working fifo\n"); 481 } else 482 printf(": ns16550, broken fifo\n"); 483 else 484 printf(": ns8250 or ns16450, no fifo\n"); 485 bus_space_write_1(iot, ioh, com_fifo, 0); 486 #ifdef COM_HAYESP 487 } 488 #endif 489 490 tp = ttymalloc(); 491 tp->t_oproc = comstart; 492 tp->t_param = comparam; 493 tp->t_hwiflow = comhwiflow; 494 495 sc->sc_tty = tp; 496 sc->sc_rbuf = malloc(com_rbuf_size << 1, M_DEVBUF, M_NOWAIT); 497 if (sc->sc_rbuf == NULL) { 498 printf("%s: unable to allocate ring buffer\n", 499 sc->sc_dev.dv_xname); 500 return; 501 } 502 sc->sc_ebuf = sc->sc_rbuf + (com_rbuf_size << 1); 503 504 tty_attach(tp); 505 506 if (!ISSET(sc->sc_hwflags, COM_HW_NOIEN)) 507 SET(sc->sc_mcr, MCR_IENABLE); 508 509 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 510 int maj; 511 512 /* locate the major number */ 513 for (maj = 0; maj < nchrdev; maj++) 514 if (cdevsw[maj].d_open == comopen) 515 break; 516 517 cn_tab->cn_dev = makedev(maj, sc->sc_dev.dv_unit); 518 519 printf("%s: console\n", sc->sc_dev.dv_xname); 520 } 521 522 #ifdef KGDB 523 /* 524 * Allow kgdb to "take over" this port. If this is 525 * the kgdb device, it has exclusive use. 526 */ 527 if (iot == com_kgdb_iot && iobase == com_kgdb_addr) { 528 com_kgdb_attached = 1; 529 530 SET(sc->sc_hwflags, COM_HW_KGDB); 531 printf("%s: kgdb\n", sc->sc_dev.dv_xname); 532 } 533 #endif 534 535 #ifdef __GENERIC_SOFT_INTERRUPTS 536 sc->sc_si = softintr_establish(IPL_SOFTSERIAL, comsoft, sc); 537 #endif 538 539 #if NRND > 0 && defined(RND_COM) 540 rnd_attach_source(&sc->rnd_source, sc->sc_dev.dv_xname, 541 RND_TYPE_TTY, 0); 542 #endif 543 544 /* if there are no enable/disable functions, assume the device 545 is always enabled */ 546 if (!sc->enable) 547 sc->enabled = 1; 548 549 com_config(sc); 550 551 SET(sc->sc_hwflags, COM_HW_DEV_OK); 552 } 553 554 void 555 com_config(sc) 556 struct com_softc *sc; 557 { 558 bus_space_tag_t iot = sc->sc_iot; 559 bus_space_handle_t ioh = sc->sc_ioh; 560 561 /* Disable interrupts before configuring the device. */ 562 sc->sc_ier = 0; 563 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 564 565 #ifdef COM_HAYESP 566 /* Look for a Hayes ESP board. */ 567 if (ISSET(sc->sc_hwflags, COM_HW_HAYESP)) { 568 sc->sc_fifolen = 1024; 569 570 /* Set 16550 compatibility mode */ 571 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD1, 572 HAYESP_SETMODE); 573 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 574 HAYESP_MODE_FIFO|HAYESP_MODE_RTS| 575 HAYESP_MODE_SCALE); 576 577 /* Set RTS/CTS flow control */ 578 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD1, 579 HAYESP_SETFLOWTYPE); 580 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 581 HAYESP_FLOW_RTS); 582 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 583 HAYESP_FLOW_CTS); 584 585 /* Set flow control levels */ 586 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD1, 587 HAYESP_SETRXFLOW); 588 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 589 HAYESP_HIBYTE(HAYESP_RXHIWMARK)); 590 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 591 HAYESP_LOBYTE(HAYESP_RXHIWMARK)); 592 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 593 HAYESP_HIBYTE(HAYESP_RXLOWMARK)); 594 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 595 HAYESP_LOBYTE(HAYESP_RXLOWMARK)); 596 } 597 #endif 598 599 #ifdef DDB 600 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) 601 com_enable_debugport(sc); 602 #endif 603 604 #ifdef KGDB 605 /* 606 * Allow kgdb to "take over" this port. If this is 607 * the kgdb device, it has exclusive use. 608 */ 609 if (ISSET(sc->sc_hwflags, COM_HW_KGDB)) 610 com_enable_debugport(sc); 611 #endif 612 } 613 614 int 615 com_detach(self, flags) 616 struct device *self; 617 int flags; 618 { 619 struct com_softc *sc = (struct com_softc *)self; 620 int maj, mn; 621 622 /* locate the major number */ 623 for (maj = 0; maj < nchrdev; maj++) 624 if (cdevsw[maj].d_open == comopen) 625 break; 626 627 /* Nuke the vnodes for any open instances. */ 628 mn = self->dv_unit; 629 vdevgone(maj, mn, mn, VCHR); 630 631 mn |= COMDIALOUT_MASK; 632 vdevgone(maj, mn, mn, VCHR); 633 634 /* Free the receive buffer. */ 635 free(sc->sc_rbuf, M_DEVBUF); 636 637 /* Detach and free the tty. */ 638 tty_detach(sc->sc_tty); 639 ttyfree(sc->sc_tty); 640 641 #ifdef __GENERIC_SOFT_INTERRUPTS 642 /* Unhook the soft interrupt handler. */ 643 softintr_disestablish(sc->sc_si); 644 #endif 645 646 #if NRND > 0 && defined(RND_COM) 647 /* Unhook the entropy source. */ 648 rnd_detach_source(&sc->rnd_source); 649 #endif 650 651 return (0); 652 } 653 654 int 655 com_activate(self, act) 656 struct device *self; 657 enum devact act; 658 { 659 struct com_softc *sc = (struct com_softc *)self; 660 int s, rv = 0; 661 662 s = splserial(); 663 switch (act) { 664 case DVACT_ACTIVATE: 665 rv = EOPNOTSUPP; 666 break; 667 668 case DVACT_DEACTIVATE: 669 if (sc->sc_hwflags & (COM_HW_CONSOLE|COM_HW_KGDB)) { 670 rv = EBUSY; 671 break; 672 } 673 674 if (sc->disable != NULL && sc->enabled != 0) { 675 (*sc->disable)(sc); 676 sc->enabled = 0; 677 } 678 break; 679 } 680 splx(s); 681 return (rv); 682 } 683 684 void 685 com_shutdown(sc) 686 struct com_softc *sc; 687 { 688 struct tty *tp = sc->sc_tty; 689 int s; 690 691 s = splserial(); 692 693 /* If we were asserting flow control, then deassert it. */ 694 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 695 com_hwiflow(sc); 696 697 /* Clear any break condition set with TIOCSBRK. */ 698 com_break(sc, 0); 699 700 /* Turn off PPS capture on last close. */ 701 sc->sc_ppsmask = 0; 702 sc->ppsparam.mode = 0; 703 704 /* 705 * Hang up if necessary. Wait a bit, so the other side has time to 706 * notice even if we immediately open the port again. 707 */ 708 if (ISSET(tp->t_cflag, HUPCL)) { 709 com_modem(sc, 0); 710 (void) tsleep(sc, TTIPRI, ttclos, hz); 711 } 712 713 /* Turn off interrupts. */ 714 #ifdef DDB 715 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) 716 sc->sc_ier = IER_ERXRDY; /* interrupt on break */ 717 else 718 #endif 719 sc->sc_ier = 0; 720 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 721 722 if (sc->disable) { 723 #ifdef DIAGNOSTIC 724 if (!sc->enabled) 725 panic("com_shutdown: not enabled?"); 726 #endif 727 (*sc->disable)(sc); 728 sc->enabled = 0; 729 } 730 731 splx(s); 732 } 733 734 int 735 comopen(dev, flag, mode, p) 736 dev_t dev; 737 int flag, mode; 738 struct proc *p; 739 { 740 int unit = COMUNIT(dev); 741 struct com_softc *sc; 742 struct tty *tp; 743 int s, s2; 744 int error; 745 746 if (unit >= com_cd.cd_ndevs) 747 return (ENXIO); 748 sc = com_cd.cd_devs[unit]; 749 if (sc == 0 || !ISSET(sc->sc_hwflags, COM_HW_DEV_OK) || 750 sc->sc_rbuf == NULL) 751 return (ENXIO); 752 753 if (ISSET(sc->sc_dev.dv_flags, DVF_ACTIVE) == 0) 754 return (ENXIO); 755 756 #ifdef KGDB 757 /* 758 * If this is the kgdb port, no other use is permitted. 759 */ 760 if (ISSET(sc->sc_hwflags, COM_HW_KGDB)) 761 return (EBUSY); 762 #endif 763 764 tp = sc->sc_tty; 765 766 if (ISSET(tp->t_state, TS_ISOPEN) && 767 ISSET(tp->t_state, TS_XCLUDE) && 768 p->p_ucred->cr_uid != 0) 769 return (EBUSY); 770 771 s = spltty(); 772 773 /* 774 * Do the following iff this is a first open. 775 */ 776 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 777 struct termios t; 778 779 tp->t_dev = dev; 780 781 s2 = splserial(); 782 783 if (sc->enable) { 784 if ((*sc->enable)(sc)) { 785 splx(s2); 786 splx(s); 787 printf("%s: device enable failed\n", 788 sc->sc_dev.dv_xname); 789 return (EIO); 790 } 791 sc->enabled = 1; 792 com_config(sc); 793 } 794 795 /* Turn on interrupts. */ 796 sc->sc_ier = IER_ERXRDY | IER_ERLS | IER_EMSC; 797 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 798 799 /* Fetch the current modem control status, needed later. */ 800 sc->sc_msr = bus_space_read_1(sc->sc_iot, sc->sc_ioh, com_msr); 801 802 /* Clear PPS capture state on first open. */ 803 sc->sc_ppsmask = 0; 804 sc->ppsparam.mode = 0; 805 806 splx(s2); 807 808 /* 809 * Initialize the termios status to the defaults. Add in the 810 * sticky bits from TIOCSFLAGS. 811 */ 812 t.c_ispeed = 0; 813 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 814 t.c_ospeed = comconsrate; 815 t.c_cflag = comconscflag; 816 } else { 817 t.c_ospeed = TTYDEF_SPEED; 818 t.c_cflag = TTYDEF_CFLAG; 819 } 820 if (ISSET(sc->sc_swflags, TIOCFLAG_CLOCAL)) 821 SET(t.c_cflag, CLOCAL); 822 if (ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS)) 823 SET(t.c_cflag, CRTSCTS); 824 if (ISSET(sc->sc_swflags, TIOCFLAG_MDMBUF)) 825 SET(t.c_cflag, MDMBUF); 826 /* Make sure comparam() will do something. */ 827 tp->t_ospeed = 0; 828 (void) comparam(tp, &t); 829 tp->t_iflag = TTYDEF_IFLAG; 830 tp->t_oflag = TTYDEF_OFLAG; 831 tp->t_lflag = TTYDEF_LFLAG; 832 ttychars(tp); 833 ttsetwater(tp); 834 835 s2 = splserial(); 836 837 /* 838 * Turn on DTR. We must always do this, even if carrier is not 839 * present, because otherwise we'd have to use TIOCSDTR 840 * immediately after setting CLOCAL, which applications do not 841 * expect. We always assert DTR while the device is open 842 * unless explicitly requested to deassert it. 843 */ 844 com_modem(sc, 1); 845 846 /* Clear the input ring, and unblock. */ 847 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 848 sc->sc_rbavail = com_rbuf_size; 849 com_iflush(sc); 850 CLR(sc->sc_rx_flags, RX_ANY_BLOCK); 851 com_hwiflow(sc); 852 853 #ifdef COM_DEBUG 854 if (com_debug) 855 comstatus(sc, "comopen "); 856 #endif 857 858 splx(s2); 859 } 860 861 splx(s); 862 863 error = ttyopen(tp, COMDIALOUT(dev), ISSET(flag, O_NONBLOCK)); 864 if (error) 865 goto bad; 866 867 error = (*linesw[tp->t_line].l_open)(dev, tp); 868 if (error) 869 goto bad; 870 871 return (0); 872 873 bad: 874 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 875 /* 876 * We failed to open the device, and nobody else had it opened. 877 * Clean up the state as appropriate. 878 */ 879 com_shutdown(sc); 880 } 881 882 return (error); 883 } 884 885 int 886 comclose(dev, flag, mode, p) 887 dev_t dev; 888 int flag, mode; 889 struct proc *p; 890 { 891 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 892 struct tty *tp = sc->sc_tty; 893 894 /* XXX This is for cons.c. */ 895 if (!ISSET(tp->t_state, TS_ISOPEN)) 896 return (0); 897 898 (*linesw[tp->t_line].l_close)(tp, flag); 899 ttyclose(tp); 900 901 if (COM_ISALIVE(sc) == 0) 902 return (0); 903 904 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 905 /* 906 * Although we got a last close, the device may still be in 907 * use; e.g. if this was the dialout node, and there are still 908 * processes waiting for carrier on the non-dialout node. 909 */ 910 com_shutdown(sc); 911 } 912 913 return (0); 914 } 915 916 int 917 comread(dev, uio, flag) 918 dev_t dev; 919 struct uio *uio; 920 int flag; 921 { 922 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 923 struct tty *tp = sc->sc_tty; 924 925 if (COM_ISALIVE(sc) == 0) 926 return (EIO); 927 928 return ((*linesw[tp->t_line].l_read)(tp, uio, flag)); 929 } 930 931 int 932 comwrite(dev, uio, flag) 933 dev_t dev; 934 struct uio *uio; 935 int flag; 936 { 937 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 938 struct tty *tp = sc->sc_tty; 939 940 if (COM_ISALIVE(sc) == 0) 941 return (EIO); 942 943 return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 944 } 945 946 struct tty * 947 comtty(dev) 948 dev_t dev; 949 { 950 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 951 struct tty *tp = sc->sc_tty; 952 953 return (tp); 954 } 955 956 int 957 comioctl(dev, cmd, data, flag, p) 958 dev_t dev; 959 u_long cmd; 960 caddr_t data; 961 int flag; 962 struct proc *p; 963 { 964 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 965 struct tty *tp = sc->sc_tty; 966 int error; 967 int s; 968 969 if (COM_ISALIVE(sc) == 0) 970 return (EIO); 971 972 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); 973 if (error >= 0) 974 return (error); 975 976 error = ttioctl(tp, cmd, data, flag, p); 977 if (error >= 0) 978 return (error); 979 980 error = 0; 981 982 s = splserial(); 983 984 switch (cmd) { 985 case TIOCSBRK: 986 com_break(sc, 1); 987 break; 988 989 case TIOCCBRK: 990 com_break(sc, 0); 991 break; 992 993 case TIOCSDTR: 994 com_modem(sc, 1); 995 break; 996 997 case TIOCCDTR: 998 com_modem(sc, 0); 999 break; 1000 1001 case TIOCGFLAGS: 1002 *(int *)data = sc->sc_swflags; 1003 break; 1004 1005 case TIOCSFLAGS: 1006 error = suser(p->p_ucred, &p->p_acflag); 1007 if (error) 1008 break; 1009 sc->sc_swflags = *(int *)data; 1010 break; 1011 1012 case TIOCMSET: 1013 case TIOCMBIS: 1014 case TIOCMBIC: 1015 tiocm_to_com(sc, cmd, *(int *)data); 1016 break; 1017 1018 case TIOCMGET: 1019 *(int *)data = com_to_tiocm(sc); 1020 break; 1021 1022 case PPS_IOC_CREATE: 1023 break; 1024 1025 case PPS_IOC_DESTROY: 1026 break; 1027 1028 case PPS_IOC_GETPARAMS: { 1029 pps_params_t *pp; 1030 pp = (pps_params_t *)data; 1031 *pp = sc->ppsparam; 1032 break; 1033 } 1034 1035 case PPS_IOC_SETPARAMS: { 1036 pps_params_t *pp; 1037 int mode; 1038 pp = (pps_params_t *)data; 1039 if (pp->mode & ~ppscap) { 1040 error = EINVAL; 1041 break; 1042 } 1043 sc->ppsparam = *pp; 1044 /* 1045 * Compute msr masks from user-specified timestamp state. 1046 */ 1047 mode = sc->ppsparam.mode; 1048 #ifdef PPS_SYNC 1049 if (mode & PPS_HARDPPSONASSERT) { 1050 mode |= PPS_CAPTUREASSERT; 1051 /* XXX revoke any previous HARDPPS source */ 1052 } 1053 if (mode & PPS_HARDPPSONCLEAR) { 1054 mode |= PPS_CAPTURECLEAR; 1055 /* XXX revoke any previous HARDPPS source */ 1056 } 1057 #endif /* PPS_SYNC */ 1058 switch (mode & PPS_CAPTUREBOTH) { 1059 case 0: 1060 sc->sc_ppsmask = 0; 1061 break; 1062 1063 case PPS_CAPTUREASSERT: 1064 sc->sc_ppsmask = MSR_DCD; 1065 sc->sc_ppsassert = MSR_DCD; 1066 sc->sc_ppsclear = -1; 1067 break; 1068 1069 case PPS_CAPTURECLEAR: 1070 sc->sc_ppsmask = MSR_DCD; 1071 sc->sc_ppsassert = -1; 1072 sc->sc_ppsclear = 0; 1073 break; 1074 1075 case PPS_CAPTUREBOTH: 1076 sc->sc_ppsmask = MSR_DCD; 1077 sc->sc_ppsassert = MSR_DCD; 1078 sc->sc_ppsclear = 0; 1079 break; 1080 1081 default: 1082 error = EINVAL; 1083 break; 1084 } 1085 break; 1086 } 1087 1088 case PPS_IOC_GETCAP: 1089 *(int*)data = ppscap; 1090 break; 1091 1092 case PPS_IOC_FETCH: { 1093 pps_info_t *pi; 1094 pi = (pps_info_t *)data; 1095 *pi = sc->ppsinfo; 1096 break; 1097 } 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 /* 2013 * Pulse-per-second (PSS) signals on edge of DCD? 2014 * Process these even if line discipline is ignoring DCD. 2015 */ 2016 if (delta & sc->sc_ppsmask) { 2017 struct timeval tv; 2018 if ((msr & sc->sc_ppsmask) == sc->sc_ppsassert) { 2019 /* XXX nanotime() */ 2020 microtime(&tv); 2021 TIMEVAL_TO_TIMESPEC(&tv, 2022 &sc->ppsinfo.assert_timestamp); 2023 if (sc->ppsparam.mode & PPS_OFFSETASSERT) { 2024 timespecadd(&sc->ppsinfo.assert_timestamp, 2025 &sc->ppsparam.assert_offset, 2026 &sc->ppsinfo.assert_timestamp); 2027 } 2028 2029 #ifdef PPS_SYNC 2030 if (sc->ppsparam.mode & PPS_HARDPPSONASSERT) 2031 hardpps(&tv, tv.tv_usec); 2032 #endif 2033 sc->ppsinfo.assert_sequence++; 2034 sc->ppsinfo.current_mode = sc->ppsparam.mode; 2035 2036 } else if ((msr & sc->sc_ppsmask) == sc->sc_ppsclear) { 2037 /* XXX nanotime() */ 2038 microtime(&tv); 2039 TIMEVAL_TO_TIMESPEC(&tv, 2040 &sc->ppsinfo.clear_timestamp); 2041 if (sc->ppsparam.mode & PPS_OFFSETCLEAR) { 2042 timespecadd(&sc->ppsinfo.clear_timestamp, 2043 &sc->ppsparam.clear_offset, 2044 &sc->ppsinfo.clear_timestamp); 2045 } 2046 2047 #ifdef PPS_SYNC 2048 if (sc->ppsparam.mode & PPS_HARDPPSONCLEAR) 2049 hardpps(&tv, tv.tv_usec); 2050 #endif 2051 sc->ppsinfo.clear_sequence++; 2052 sc->ppsinfo.current_mode = sc->ppsparam.mode; 2053 } 2054 } 2055 2056 /* 2057 * Process normal status changes 2058 */ 2059 if (ISSET(delta, sc->sc_msr_mask)) { 2060 SET(sc->sc_msr_delta, delta); 2061 2062 /* 2063 * Stop output immediately if we lose the output 2064 * flow control signal or carrier detect. 2065 */ 2066 if (ISSET(~msr, sc->sc_msr_mask)) { 2067 sc->sc_tbc = 0; 2068 sc->sc_heldtbc = 0; 2069 #ifdef COM_DEBUG 2070 if (com_debug) 2071 comstatus(sc, "comintr "); 2072 #endif 2073 } 2074 2075 sc->sc_st_check = 1; 2076 } 2077 } while (!ISSET((iir = bus_space_read_1(iot, ioh, com_iir)), IIR_NOPEND)); 2078 2079 /* 2080 * Done handling any receive interrupts. See if data can be 2081 * transmitted as well. Schedule tx done event if no data left 2082 * and tty was marked busy. 2083 */ 2084 if (ISSET(lsr, LSR_TXRDY)) { 2085 /* 2086 * If we've delayed a parameter change, do it now, and restart 2087 * output. 2088 */ 2089 if (sc->sc_heldchange) { 2090 com_loadchannelregs(sc); 2091 sc->sc_heldchange = 0; 2092 sc->sc_tbc = sc->sc_heldtbc; 2093 sc->sc_heldtbc = 0; 2094 } 2095 2096 /* Output the next chunk of the contiguous buffer, if any. */ 2097 if (sc->sc_tbc > 0) { 2098 int n; 2099 2100 n = sc->sc_tbc; 2101 if (n > sc->sc_fifolen) 2102 n = sc->sc_fifolen; 2103 bus_space_write_multi_1(iot, ioh, com_data, sc->sc_tba, n); 2104 sc->sc_tbc -= n; 2105 sc->sc_tba += n; 2106 } else { 2107 /* Disable transmit completion interrupts if necessary. */ 2108 if (ISSET(sc->sc_ier, IER_ETXRDY)) { 2109 CLR(sc->sc_ier, IER_ETXRDY); 2110 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 2111 } 2112 if (sc->sc_tx_busy) { 2113 sc->sc_tx_busy = 0; 2114 sc->sc_tx_done = 1; 2115 } 2116 } 2117 } 2118 2119 /* Wake up the poller. */ 2120 #ifdef __GENERIC_SOFT_INTERRUPTS 2121 softintr_schedule(sc->sc_si); 2122 #else 2123 #ifndef __NO_SOFT_SERIAL_INTERRUPT 2124 setsoftserial(); 2125 #else 2126 if (!com_softintr_scheduled) { 2127 com_softintr_scheduled = 1; 2128 timeout(comsoft, NULL, 1); 2129 } 2130 #endif 2131 #endif 2132 2133 #if NRND > 0 && defined(RND_COM) 2134 rnd_add_uint32(&sc->rnd_source, iir | lsr); 2135 #endif 2136 2137 return (1); 2138 } 2139 2140 /* 2141 * The following functions are polled getc and putc routines, shared 2142 * by the console and kgdb glue. 2143 */ 2144 2145 int 2146 com_common_getc(iot, ioh) 2147 bus_space_tag_t iot; 2148 bus_space_handle_t ioh; 2149 { 2150 int s = splserial(); 2151 u_char stat, c; 2152 2153 /* block until a character becomes available */ 2154 while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_RXRDY)) 2155 ; 2156 2157 c = bus_space_read_1(iot, ioh, com_data); 2158 stat = bus_space_read_1(iot, ioh, com_iir); 2159 splx(s); 2160 return (c); 2161 } 2162 2163 void 2164 com_common_putc(iot, ioh, c) 2165 bus_space_tag_t iot; 2166 bus_space_handle_t ioh; 2167 int c; 2168 { 2169 int s = splserial(); 2170 int timo; 2171 2172 /* wait for any pending transmission to finish */ 2173 timo = 150000; 2174 while (!ISSET(bus_space_read_1(iot, ioh, com_lsr), LSR_TXRDY) && --timo) 2175 continue; 2176 2177 bus_space_write_1(iot, ioh, com_data, c); 2178 COM_BARRIER(iot, ioh, BR | BW); 2179 2180 /* wait for this transmission to complete */ 2181 timo = 1500000; 2182 while (!ISSET(bus_space_read_1(iot, ioh, com_lsr), LSR_TXRDY) && --timo) 2183 continue; 2184 2185 splx(s); 2186 } 2187 2188 /* 2189 * Initialize UART for use as console or KGDB line. 2190 */ 2191 int 2192 cominit(iot, iobase, rate, frequency, cflag, iohp) 2193 bus_space_tag_t iot; 2194 int iobase; 2195 int rate, frequency; 2196 tcflag_t cflag; 2197 bus_space_handle_t *iohp; 2198 { 2199 bus_space_handle_t ioh; 2200 2201 if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) 2202 return (ENOMEM); /* ??? */ 2203 2204 bus_space_write_1(iot, ioh, com_lcr, LCR_EERS); 2205 bus_space_write_1(iot, ioh, com_efr, 0); 2206 bus_space_write_1(iot, ioh, com_lcr, LCR_DLAB); 2207 rate = comspeed(rate, frequency); 2208 bus_space_write_1(iot, ioh, com_dlbl, rate); 2209 bus_space_write_1(iot, ioh, com_dlbh, rate >> 8); 2210 bus_space_write_1(iot, ioh, com_lcr, cflag2lcr(cflag)); 2211 bus_space_write_1(iot, ioh, com_mcr, MCR_DTR | MCR_RTS); 2212 bus_space_write_1(iot, ioh, com_fifo, 2213 FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_1); 2214 bus_space_write_1(iot, ioh, com_ier, 0); 2215 2216 *iohp = ioh; 2217 return (0); 2218 } 2219 2220 /* 2221 * Following are all routines needed for COM to act as console 2222 */ 2223 2224 int 2225 comcnattach(iot, iobase, rate, frequency, cflag) 2226 bus_space_tag_t iot; 2227 int iobase; 2228 int rate, frequency; 2229 tcflag_t cflag; 2230 { 2231 int res; 2232 static struct consdev comcons = { 2233 NULL, NULL, comcngetc, comcnputc, comcnpollc, NODEV, CN_NORMAL 2234 }; 2235 2236 res = cominit(iot, iobase, rate, frequency, cflag, &comconsioh); 2237 if (res) 2238 return (res); 2239 2240 cn_tab = &comcons; 2241 2242 comconstag = iot; 2243 comconsaddr = iobase; 2244 comconsrate = rate; 2245 comconscflag = cflag; 2246 2247 return (0); 2248 } 2249 2250 int 2251 comcngetc(dev) 2252 dev_t dev; 2253 { 2254 2255 return (com_common_getc(comconstag, comconsioh)); 2256 } 2257 2258 /* 2259 * Console kernel output character routine. 2260 */ 2261 void 2262 comcnputc(dev, c) 2263 dev_t dev; 2264 int c; 2265 { 2266 2267 com_common_putc(comconstag, comconsioh, c); 2268 } 2269 2270 void 2271 comcnpollc(dev, on) 2272 dev_t dev; 2273 int on; 2274 { 2275 2276 } 2277 2278 #ifdef KGDB 2279 int 2280 com_kgdb_attach(iot, iobase, rate, frequency, cflag) 2281 bus_space_tag_t iot; 2282 int iobase; 2283 int rate, frequency; 2284 tcflag_t cflag; 2285 { 2286 int res; 2287 2288 if (iot == comconstag && iobase == comconsaddr) 2289 return (EBUSY); /* cannot share with console */ 2290 2291 res = cominit(iot, iobase, rate, frequency, cflag, &com_kgdb_ioh); 2292 if (res) 2293 return (res); 2294 2295 kgdb_attach(com_kgdb_getc, com_kgdb_putc, NULL); 2296 kgdb_dev = 123; /* unneeded, only to satisfy some tests */ 2297 2298 com_kgdb_iot = iot; 2299 com_kgdb_addr = iobase; 2300 2301 return (0); 2302 } 2303 2304 /* ARGSUSED */ 2305 int 2306 com_kgdb_getc(arg) 2307 void *arg; 2308 { 2309 2310 return (com_common_getc(com_kgdb_iot, com_kgdb_ioh)); 2311 } 2312 2313 /* ARGSUSED */ 2314 void 2315 com_kgdb_putc(arg, c) 2316 void *arg; 2317 int c; 2318 { 2319 2320 return (com_common_putc(com_kgdb_iot, com_kgdb_ioh, c)); 2321 } 2322 #endif /* KGDB */ 2323 2324 /* helper function to identify the com ports used by 2325 console or KGDB (and not yet autoconf attached) */ 2326 int 2327 com_is_console(iot, iobase, ioh) 2328 bus_space_tag_t iot; 2329 int iobase; 2330 bus_space_handle_t *ioh; 2331 { 2332 bus_space_handle_t help; 2333 2334 if (!comconsattached && 2335 iot == comconstag && iobase == comconsaddr) 2336 help = comconsioh; 2337 #ifdef KGDB 2338 else if (!com_kgdb_attached && 2339 iot == com_kgdb_iot && iobase == com_kgdb_addr) 2340 help = com_kgdb_ioh; 2341 #endif 2342 else 2343 return (0); 2344 2345 if (ioh) 2346 *ioh = help; 2347 return (1); 2348 } 2349
Indexes created Mon Oct 20 11:09:49 GMT 2025