com.c revision 1.197
1 /* $NetBSD: com.c,v 1.197 2002/07/29 05:54:09 simonb 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 <sys/cdefs.h> 80 __KERNEL_RCSID(0, "$NetBSD: com.c,v 1.197 2002/07/29 05:54:09 simonb Exp $"); 81 82 #include "opt_com.h" 83 #include "opt_ddb.h" 84 #include "opt_kgdb.h" 85 86 #include "rnd.h" 87 #if NRND > 0 && defined(RND_COM) 88 #include <sys/rnd.h> 89 #endif 90 91 /* 92 * Override cnmagic(9) macro before including <sys/systm.h>. 93 * We need to know if cn_check_magic triggered debugger, so set a flag. 94 * Callers of cn_check_magic must declare int cn_trapped = 0; 95 * XXX: this is *ugly*! 96 */ 97 #define cn_trap() \ 98 do { \ 99 console_debugger(); \ 100 cn_trapped = 1; \ 101 } while (/* CONSTCOND */ 0) 102 103 #include <sys/param.h> 104 #include <sys/systm.h> 105 #include <sys/ioctl.h> 106 #include <sys/select.h> 107 #include <sys/tty.h> 108 #include <sys/proc.h> 109 #include <sys/user.h> 110 #include <sys/conf.h> 111 #include <sys/file.h> 112 #include <sys/uio.h> 113 #include <sys/kernel.h> 114 #include <sys/syslog.h> 115 #include <sys/device.h> 116 #include <sys/malloc.h> 117 #include <sys/timepps.h> 118 #include <sys/vnode.h> 119 120 #include <machine/intr.h> 121 #include <machine/bus.h> 122 123 #include <dev/ic/comreg.h> 124 #include <dev/ic/comvar.h> 125 #include <dev/ic/ns16550reg.h> 126 #include <dev/ic/st16650reg.h> 127 #ifdef COM_HAYESP 128 #include <dev/ic/hayespreg.h> 129 #endif 130 #define com_lcr com_cfcr 131 #include <dev/cons.h> 132 133 #ifdef COM_HAYESP 134 int comprobeHAYESP(bus_space_handle_t hayespioh, struct com_softc *sc); 135 #endif 136 137 static void com_enable_debugport(struct com_softc *); 138 139 void com_config(struct com_softc *); 140 void com_shutdown(struct com_softc *); 141 int comspeed(long, long); 142 static u_char cflag2lcr(tcflag_t); 143 int comparam(struct tty *, struct termios *); 144 void comstart(struct tty *); 145 int comhwiflow(struct tty *, int); 146 147 void com_loadchannelregs(struct com_softc *); 148 void com_hwiflow(struct com_softc *); 149 void com_break(struct com_softc *, int); 150 void com_modem(struct com_softc *, int); 151 void tiocm_to_com(struct com_softc *, u_long, int); 152 int com_to_tiocm(struct com_softc *); 153 void com_iflush(struct com_softc *); 154 155 int com_common_getc(dev_t, bus_space_tag_t, bus_space_handle_t); 156 void com_common_putc(dev_t, bus_space_tag_t, bus_space_handle_t, int); 157 158 int cominit(bus_space_tag_t, bus_addr_t, int, int, tcflag_t, 159 bus_space_handle_t *); 160 161 /* XXX: This belongs elsewhere */ 162 cdev_decl(com); 163 164 int comcngetc(dev_t); 165 void comcnputc(dev_t, int); 166 void comcnpollc(dev_t, int); 167 168 #define integrate static inline 169 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 170 void comsoft(void *); 171 #else 172 #ifndef __NO_SOFT_SERIAL_INTERRUPT 173 void comsoft(void); 174 #else 175 void comsoft(void *); 176 struct callout comsoft_callout = CALLOUT_INITIALIZER; 177 #endif 178 #endif 179 integrate void com_rxsoft(struct com_softc *, struct tty *); 180 integrate void com_txsoft(struct com_softc *, struct tty *); 181 integrate void com_stsoft(struct com_softc *, struct tty *); 182 integrate void com_schedrx(struct com_softc *); 183 void comdiag(void *); 184 185 extern struct cfdriver com_cd; 186 187 /* 188 * Make this an option variable one can patch. 189 * But be warned: this must be a power of 2! 190 */ 191 u_int com_rbuf_size = COM_RING_SIZE; 192 193 /* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */ 194 u_int com_rbuf_hiwat = (COM_RING_SIZE * 1) / 4; 195 u_int com_rbuf_lowat = (COM_RING_SIZE * 3) / 4; 196 197 static bus_addr_t comconsaddr; 198 static bus_space_tag_t comconstag; 199 static bus_space_handle_t comconsioh; 200 static int comconsattached; 201 static int comconsrate; 202 static tcflag_t comconscflag; 203 static struct cnm_state com_cnm_state; 204 205 static int ppscap = 206 PPS_TSFMT_TSPEC | 207 PPS_CAPTUREASSERT | 208 PPS_CAPTURECLEAR | 209 #ifdef PPS_SYNC 210 PPS_HARDPPSONASSERT | PPS_HARDPPSONCLEAR | 211 #endif /* PPS_SYNC */ 212 PPS_OFFSETASSERT | PPS_OFFSETCLEAR; 213 214 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS 215 #ifdef __NO_SOFT_SERIAL_INTERRUPT 216 volatile int com_softintr_scheduled; 217 #endif 218 #endif 219 220 #ifdef KGDB 221 #include <sys/kgdb.h> 222 223 static bus_addr_t com_kgdb_addr; 224 static bus_space_tag_t com_kgdb_iot; 225 static bus_space_handle_t com_kgdb_ioh; 226 static int com_kgdb_attached; 227 228 int com_kgdb_getc(void *); 229 void com_kgdb_putc(void *, int); 230 #endif /* KGDB */ 231 232 #define COMUNIT_MASK 0x7ffff 233 #define COMDIALOUT_MASK 0x80000 234 235 #define COMUNIT(x) (minor(x) & COMUNIT_MASK) 236 #define COMDIALOUT(x) (minor(x) & COMDIALOUT_MASK) 237 238 #define COM_ISALIVE(sc) ((sc)->enabled != 0 && \ 239 ISSET((sc)->sc_dev.dv_flags, DVF_ACTIVE)) 240 241 #define BR BUS_SPACE_BARRIER_READ 242 #define BW BUS_SPACE_BARRIER_WRITE 243 #define COM_BARRIER(t, h, f) bus_space_barrier((t), (h), 0, COM_NPORTS, (f)) 244 245 #if (defined(MULTIPROCESSOR) || defined(LOCKDEBUG)) && defined(COM_MPLOCK) 246 247 #define COM_LOCK(sc) simple_lock(&(sc)->sc_lock) 248 #define COM_UNLOCK(sc) simple_unlock(&(sc)->sc_lock) 249 250 #else 251 252 #define COM_LOCK(sc) 253 #define COM_UNLOCK(sc) 254 255 #endif 256 257 int 258 comspeed(long speed, long frequency) 259 { 260 #define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */ 261 262 int x, err; 263 264 #if 0 265 if (speed == 0) 266 return (0); 267 #endif 268 if (speed <= 0) 269 return (-1); 270 x = divrnd(frequency / 16, speed); 271 if (x <= 0) 272 return (-1); 273 err = divrnd(((quad_t)frequency) * 1000 / 16, speed * x) - 1000; 274 if (err < 0) 275 err = -err; 276 if (err > COM_TOLERANCE) 277 return (-1); 278 return (x); 279 280 #undef divrnd 281 } 282 283 #ifdef COM_DEBUG 284 int com_debug = 0; 285 286 void comstatus(struct com_softc *, char *); 287 void 288 comstatus(struct com_softc *sc, char *str) 289 { 290 struct tty *tp = sc->sc_tty; 291 292 printf("%s: %s %sclocal %sdcd %sts_carr_on %sdtr %stx_stopped\n", 293 sc->sc_dev.dv_xname, str, 294 ISSET(tp->t_cflag, CLOCAL) ? "+" : "-", 295 ISSET(sc->sc_msr, MSR_DCD) ? "+" : "-", 296 ISSET(tp->t_state, TS_CARR_ON) ? "+" : "-", 297 ISSET(sc->sc_mcr, MCR_DTR) ? "+" : "-", 298 sc->sc_tx_stopped ? "+" : "-"); 299 300 printf("%s: %s %scrtscts %scts %sts_ttstop %srts %xrx_flags\n", 301 sc->sc_dev.dv_xname, str, 302 ISSET(tp->t_cflag, CRTSCTS) ? "+" : "-", 303 ISSET(sc->sc_msr, MSR_CTS) ? "+" : "-", 304 ISSET(tp->t_state, TS_TTSTOP) ? "+" : "-", 305 ISSET(sc->sc_mcr, MCR_RTS) ? "+" : "-", 306 sc->sc_rx_flags); 307 } 308 #endif 309 310 int 311 comprobe1(bus_space_tag_t iot, bus_space_handle_t ioh) 312 { 313 314 /* force access to id reg */ 315 bus_space_write_1(iot, ioh, com_lcr, LCR_8BITS); 316 bus_space_write_1(iot, ioh, com_iir, 0); 317 if ((bus_space_read_1(iot, ioh, com_lcr) != LCR_8BITS) || 318 (bus_space_read_1(iot, ioh, com_iir) & 0x38)) 319 return (0); 320 321 return (1); 322 } 323 324 #ifdef COM_HAYESP 325 int 326 comprobeHAYESP(bus_space_handle_t hayespioh, struct com_softc *sc) 327 { 328 char val, dips; 329 int combaselist[] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8 }; 330 bus_space_tag_t iot = sc->sc_iot; 331 332 /* 333 * Hayes ESP cards have two iobases. One is for compatibility with 334 * 16550 serial chips, and at the same ISA PC base addresses. The 335 * other is for ESP-specific enhanced features, and lies at a 336 * different addressing range entirely (0x140, 0x180, 0x280, or 0x300). 337 */ 338 339 /* Test for ESP signature */ 340 if ((bus_space_read_1(iot, hayespioh, 0) & 0xf3) == 0) 341 return (0); 342 343 /* 344 * ESP is present at ESP enhanced base address; unknown com port 345 */ 346 347 /* Get the dip-switch configurations */ 348 bus_space_write_1(iot, hayespioh, HAYESP_CMD1, HAYESP_GETDIPS); 349 dips = bus_space_read_1(iot, hayespioh, HAYESP_STATUS1); 350 351 /* Determine which com port this ESP card services: bits 0,1 of */ 352 /* dips is the port # (0-3); combaselist[val] is the com_iobase */ 353 if (sc->sc_iobase != combaselist[dips & 0x03]) 354 return (0); 355 356 printf(": ESP"); 357 358 /* Check ESP Self Test bits. */ 359 /* Check for ESP version 2.0: bits 4,5,6 == 010 */ 360 bus_space_write_1(iot, hayespioh, HAYESP_CMD1, HAYESP_GETTEST); 361 val = bus_space_read_1(iot, hayespioh, HAYESP_STATUS1); /* Clear reg1 */ 362 val = bus_space_read_1(iot, hayespioh, HAYESP_STATUS2); 363 if ((val & 0x70) < 0x20) { 364 printf("-old (%o)", val & 0x70); 365 /* we do not support the necessary features */ 366 return (0); 367 } 368 369 /* Check for ability to emulate 16550: bit 8 == 1 */ 370 if ((dips & 0x80) == 0) { 371 printf(" slave"); 372 /* XXX Does slave really mean no 16550 support?? */ 373 return (0); 374 } 375 376 /* 377 * If we made it this far, we are a full-featured ESP v2.0 (or 378 * better), at the correct com port address. 379 */ 380 381 SET(sc->sc_hwflags, COM_HW_HAYESP); 382 printf(", 1024 byte fifo\n"); 383 return (1); 384 } 385 #endif 386 387 static void 388 com_enable_debugport(struct com_softc *sc) 389 { 390 int s; 391 392 /* Turn on line break interrupt, set carrier. */ 393 s = splserial(); 394 COM_LOCK(sc); 395 sc->sc_ier = IER_ERXRDY; 396 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 397 SET(sc->sc_mcr, MCR_DTR | MCR_RTS); 398 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_mcr, sc->sc_mcr); 399 COM_UNLOCK(sc); 400 splx(s); 401 } 402 403 void 404 com_attach_subr(struct com_softc *sc) 405 { 406 bus_addr_t iobase = sc->sc_iobase; 407 bus_space_tag_t iot = sc->sc_iot; 408 bus_space_handle_t ioh = sc->sc_ioh; 409 struct tty *tp; 410 #ifdef COM16650 411 u_int8_t lcr; 412 #endif 413 #ifdef COM_HAYESP 414 int hayesp_ports[] = { 0x140, 0x180, 0x280, 0x300, 0 }; 415 int *hayespp; 416 #endif 417 418 callout_init(&sc->sc_diag_callout); 419 #if (defined(MULTIPROCESSOR) || defined(LOCKDEBUG)) && defined(COM_MPLOCK) 420 simple_lock_init(&sc->sc_lock); 421 #endif 422 423 /* Disable interrupts before configuring the device. */ 424 sc->sc_ier = 0; 425 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 426 427 if (iot == comconstag && iobase == comconsaddr) { 428 comconsattached = 1; 429 430 /* Make sure the console is always "hardwired". */ 431 delay(1000); /* wait for output to finish */ 432 SET(sc->sc_hwflags, COM_HW_CONSOLE); 433 SET(sc->sc_swflags, TIOCFLAG_SOFTCAR); 434 } 435 436 #ifdef COM_HAYESP 437 sc->sc_prescaler = 0; /* set prescaler to x1. */ 438 439 /* Look for a Hayes ESP board. */ 440 for (hayespp = hayesp_ports; *hayespp != 0; hayespp++) { 441 bus_space_handle_t hayespioh; 442 443 #define HAYESP_NPORTS 8 /* XXX XXX XXX ??? ??? ??? */ 444 if (bus_space_map(iot, *hayespp, HAYESP_NPORTS, 0, &hayespioh)) 445 continue; 446 if (comprobeHAYESP(hayespioh, sc)) { 447 sc->sc_hayespioh = hayespioh; 448 sc->sc_fifolen = 1024; 449 450 break; 451 } 452 bus_space_unmap(iot, hayespioh, HAYESP_NPORTS); 453 } 454 /* No ESP; look for other things. */ 455 if (!ISSET(sc->sc_hwflags, COM_HW_HAYESP)) { 456 #endif 457 sc->sc_fifolen = 1; 458 /* look for a NS 16550AF UART with FIFOs */ 459 bus_space_write_1(iot, ioh, com_fifo, 460 FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_14); 461 delay(100); 462 if (ISSET(bus_space_read_1(iot, ioh, com_iir), IIR_FIFO_MASK) 463 == IIR_FIFO_MASK) 464 if (ISSET(bus_space_read_1(iot, ioh, com_fifo), FIFO_TRIGGER_14) 465 == FIFO_TRIGGER_14) { 466 SET(sc->sc_hwflags, COM_HW_FIFO); 467 468 #ifdef COM16650 469 /* 470 * IIR changes into the EFR if LCR is set to LCR_EERS 471 * on 16650s. We also know IIR != 0 at this point. 472 * Write 0 into the EFR, and read it. If the result 473 * is 0, we have a 16650. 474 * 475 * Older 16650s were broken; the test to detect them 476 * is taken from the Linux driver. Apparently 477 * setting DLAB enable gives access to the EFR on 478 * these chips. 479 */ 480 lcr = bus_space_read_1(iot, ioh, com_lcr); 481 bus_space_write_1(iot, ioh, com_lcr, LCR_EERS); 482 bus_space_write_1(iot, ioh, com_efr, 0); 483 if (bus_space_read_1(iot, ioh, com_efr) == 0) { 484 bus_space_write_1(iot, ioh, com_lcr, 485 lcr | LCR_DLAB); 486 if (bus_space_read_1(iot, ioh, com_efr) == 0) { 487 CLR(sc->sc_hwflags, COM_HW_FIFO); 488 sc->sc_fifolen = 0; 489 } else { 490 SET(sc->sc_hwflags, COM_HW_FLOW); 491 sc->sc_fifolen = 32; 492 } 493 } else 494 #endif 495 sc->sc_fifolen = 16; 496 497 #ifdef COM16650 498 bus_space_write_1(iot, ioh, com_lcr, lcr); 499 if (sc->sc_fifolen == 0) 500 printf(": st16650, broken fifo\n"); 501 else if (sc->sc_fifolen == 32) 502 printf(": st16650a, working fifo\n"); 503 else 504 #endif 505 printf(": ns16550a, working fifo\n"); 506 } else 507 printf(": ns16550, broken fifo\n"); 508 else 509 printf(": ns8250 or ns16450, no fifo\n"); 510 bus_space_write_1(iot, ioh, com_fifo, 0); 511 if (ISSET(sc->sc_hwflags, COM_HW_TXFIFO_DISABLE)) { 512 sc->sc_fifolen = 1; 513 printf("%s: txfifo disabled\n", sc->sc_dev.dv_xname); 514 } 515 #ifdef COM_HAYESP 516 } 517 #endif 518 519 tp = ttymalloc(); 520 tp->t_oproc = comstart; 521 tp->t_param = comparam; 522 tp->t_hwiflow = comhwiflow; 523 524 sc->sc_tty = tp; 525 sc->sc_rbuf = malloc(com_rbuf_size << 1, M_DEVBUF, M_NOWAIT); 526 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 527 sc->sc_rbavail = com_rbuf_size; 528 if (sc->sc_rbuf == NULL) { 529 printf("%s: unable to allocate ring buffer\n", 530 sc->sc_dev.dv_xname); 531 return; 532 } 533 sc->sc_ebuf = sc->sc_rbuf + (com_rbuf_size << 1); 534 535 tty_attach(tp); 536 537 if (!ISSET(sc->sc_hwflags, COM_HW_NOIEN)) 538 SET(sc->sc_mcr, MCR_IENABLE); 539 540 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 541 int maj; 542 543 /* locate the major number */ 544 for (maj = 0; maj < nchrdev; maj++) 545 if (cdevsw[maj].d_open == comopen) 546 break; 547 548 cn_tab->cn_dev = makedev(maj, sc->sc_dev.dv_unit); 549 550 printf("%s: console\n", sc->sc_dev.dv_xname); 551 } 552 553 #ifdef KGDB 554 /* 555 * Allow kgdb to "take over" this port. If this is 556 * the kgdb device, it has exclusive use. 557 */ 558 if (iot == com_kgdb_iot && iobase == com_kgdb_addr) { 559 com_kgdb_attached = 1; 560 561 SET(sc->sc_hwflags, COM_HW_KGDB); 562 printf("%s: kgdb\n", sc->sc_dev.dv_xname); 563 } 564 #endif 565 566 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 567 sc->sc_si = softintr_establish(IPL_SOFTSERIAL, comsoft, sc); 568 #endif 569 570 #if NRND > 0 && defined(RND_COM) 571 rnd_attach_source(&sc->rnd_source, sc->sc_dev.dv_xname, 572 RND_TYPE_TTY, 0); 573 #endif 574 575 /* if there are no enable/disable functions, assume the device 576 is always enabled */ 577 if (!sc->enable) 578 sc->enabled = 1; 579 580 com_config(sc); 581 582 SET(sc->sc_hwflags, COM_HW_DEV_OK); 583 } 584 585 void 586 com_config(struct com_softc *sc) 587 { 588 bus_space_tag_t iot = sc->sc_iot; 589 bus_space_handle_t ioh = sc->sc_ioh; 590 591 /* Disable interrupts before configuring the device. */ 592 sc->sc_ier = 0; 593 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 594 595 #ifdef COM_HAYESP 596 /* Look for a Hayes ESP board. */ 597 if (ISSET(sc->sc_hwflags, COM_HW_HAYESP)) { 598 sc->sc_fifolen = 1024; 599 600 /* Set 16550 compatibility mode */ 601 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD1, 602 HAYESP_SETMODE); 603 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 604 HAYESP_MODE_FIFO|HAYESP_MODE_RTS| 605 HAYESP_MODE_SCALE); 606 607 /* Set RTS/CTS flow control */ 608 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD1, 609 HAYESP_SETFLOWTYPE); 610 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 611 HAYESP_FLOW_RTS); 612 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 613 HAYESP_FLOW_CTS); 614 615 /* Set flow control levels */ 616 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD1, 617 HAYESP_SETRXFLOW); 618 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 619 HAYESP_HIBYTE(HAYESP_RXHIWMARK)); 620 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 621 HAYESP_LOBYTE(HAYESP_RXHIWMARK)); 622 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 623 HAYESP_HIBYTE(HAYESP_RXLOWMARK)); 624 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 625 HAYESP_LOBYTE(HAYESP_RXLOWMARK)); 626 } 627 #endif 628 629 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE|COM_HW_KGDB)) 630 com_enable_debugport(sc); 631 } 632 633 int 634 com_detach(struct device *self, int flags) 635 { 636 struct com_softc *sc = (struct com_softc *)self; 637 int maj, mn; 638 639 /* locate the major number */ 640 for (maj = 0; maj < nchrdev; maj++) 641 if (cdevsw[maj].d_open == comopen) 642 break; 643 644 /* Nuke the vnodes for any open instances. */ 645 mn = self->dv_unit; 646 vdevgone(maj, mn, mn, VCHR); 647 648 mn |= COMDIALOUT_MASK; 649 vdevgone(maj, mn, mn, VCHR); 650 651 if (sc->sc_rbuf == NULL) { 652 /* 653 * Ring buffer allocation failed in the com_attach_subr, 654 * only the tty is allocated, and nothing else. 655 */ 656 ttyfree(sc->sc_tty); 657 return 0; 658 } 659 660 /* Free the receive buffer. */ 661 free(sc->sc_rbuf, M_DEVBUF); 662 663 /* Detach and free the tty. */ 664 tty_detach(sc->sc_tty); 665 ttyfree(sc->sc_tty); 666 667 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 668 /* Unhook the soft interrupt handler. */ 669 softintr_disestablish(sc->sc_si); 670 #endif 671 672 #if NRND > 0 && defined(RND_COM) 673 /* Unhook the entropy source. */ 674 rnd_detach_source(&sc->rnd_source); 675 #endif 676 677 return (0); 678 } 679 680 int 681 com_activate(struct device *self, enum devact act) 682 { 683 struct com_softc *sc = (struct com_softc *)self; 684 int s, rv = 0; 685 686 s = splserial(); 687 COM_LOCK(sc); 688 switch (act) { 689 case DVACT_ACTIVATE: 690 rv = EOPNOTSUPP; 691 break; 692 693 case DVACT_DEACTIVATE: 694 if (sc->sc_hwflags & (COM_HW_CONSOLE|COM_HW_KGDB)) { 695 rv = EBUSY; 696 break; 697 } 698 699 if (sc->disable != NULL && sc->enabled != 0) { 700 (*sc->disable)(sc); 701 sc->enabled = 0; 702 } 703 break; 704 } 705 706 COM_UNLOCK(sc); 707 splx(s); 708 return (rv); 709 } 710 711 void 712 com_shutdown(struct com_softc *sc) 713 { 714 struct tty *tp = sc->sc_tty; 715 int s; 716 717 s = splserial(); 718 COM_LOCK(sc); 719 720 /* If we were asserting flow control, then deassert it. */ 721 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 722 com_hwiflow(sc); 723 724 /* Clear any break condition set with TIOCSBRK. */ 725 com_break(sc, 0); 726 727 /* Turn off PPS capture on last close. */ 728 sc->sc_ppsmask = 0; 729 sc->ppsparam.mode = 0; 730 731 /* 732 * Hang up if necessary. Wait a bit, so the other side has time to 733 * notice even if we immediately open the port again. 734 * Avoid tsleeping above splhigh(). 735 */ 736 if (ISSET(tp->t_cflag, HUPCL)) { 737 com_modem(sc, 0); 738 COM_UNLOCK(sc); 739 splx(s); 740 /* XXX tsleep will only timeout */ 741 (void) tsleep(sc, TTIPRI, ttclos, hz); 742 s = splserial(); 743 COM_LOCK(sc); 744 } 745 746 /* Turn off interrupts. */ 747 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) 748 sc->sc_ier = IER_ERXRDY; /* interrupt on break */ 749 else 750 sc->sc_ier = 0; 751 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 752 753 if (sc->disable) { 754 #ifdef DIAGNOSTIC 755 if (!sc->enabled) 756 panic("com_shutdown: not enabled?"); 757 #endif 758 (*sc->disable)(sc); 759 sc->enabled = 0; 760 } 761 COM_UNLOCK(sc); 762 splx(s); 763 } 764 765 int 766 comopen(dev_t dev, int flag, int mode, struct proc *p) 767 { 768 struct com_softc *sc; 769 struct tty *tp; 770 int s, s2; 771 int error; 772 773 sc = device_lookup(&com_cd, COMUNIT(dev)); 774 if (sc == NULL || !ISSET(sc->sc_hwflags, COM_HW_DEV_OK) || 775 sc->sc_rbuf == NULL) 776 return (ENXIO); 777 778 if (ISSET(sc->sc_dev.dv_flags, DVF_ACTIVE) == 0) 779 return (ENXIO); 780 781 #ifdef KGDB 782 /* 783 * If this is the kgdb port, no other use is permitted. 784 */ 785 if (ISSET(sc->sc_hwflags, COM_HW_KGDB)) 786 return (EBUSY); 787 #endif 788 789 tp = sc->sc_tty; 790 791 if (ISSET(tp->t_state, TS_ISOPEN) && 792 ISSET(tp->t_state, TS_XCLUDE) && 793 p->p_ucred->cr_uid != 0) 794 return (EBUSY); 795 796 s = spltty(); 797 798 /* 799 * Do the following iff this is a first open. 800 */ 801 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 802 struct termios t; 803 804 tp->t_dev = dev; 805 806 s2 = splserial(); 807 COM_LOCK(sc); 808 809 if (sc->enable) { 810 if ((*sc->enable)(sc)) { 811 COM_UNLOCK(sc); 812 splx(s2); 813 splx(s); 814 printf("%s: device enable failed\n", 815 sc->sc_dev.dv_xname); 816 return (EIO); 817 } 818 sc->enabled = 1; 819 com_config(sc); 820 } 821 822 /* Turn on interrupts. */ 823 sc->sc_ier = IER_ERXRDY | IER_ERLS | IER_EMSC; 824 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 825 826 /* Fetch the current modem control status, needed later. */ 827 sc->sc_msr = bus_space_read_1(sc->sc_iot, sc->sc_ioh, com_msr); 828 829 /* Clear PPS capture state on first open. */ 830 sc->sc_ppsmask = 0; 831 sc->ppsparam.mode = 0; 832 833 COM_UNLOCK(sc); 834 splx(s2); 835 836 /* 837 * Initialize the termios status to the defaults. Add in the 838 * sticky bits from TIOCSFLAGS. 839 */ 840 t.c_ispeed = 0; 841 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 842 t.c_ospeed = comconsrate; 843 t.c_cflag = comconscflag; 844 } else { 845 t.c_ospeed = TTYDEF_SPEED; 846 t.c_cflag = TTYDEF_CFLAG; 847 } 848 if (ISSET(sc->sc_swflags, TIOCFLAG_CLOCAL)) 849 SET(t.c_cflag, CLOCAL); 850 if (ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS)) 851 SET(t.c_cflag, CRTSCTS); 852 if (ISSET(sc->sc_swflags, TIOCFLAG_MDMBUF)) 853 SET(t.c_cflag, MDMBUF); 854 /* Make sure comparam() will do something. */ 855 tp->t_ospeed = 0; 856 (void) comparam(tp, &t); 857 tp->t_iflag = TTYDEF_IFLAG; 858 tp->t_oflag = TTYDEF_OFLAG; 859 tp->t_lflag = TTYDEF_LFLAG; 860 ttychars(tp); 861 ttsetwater(tp); 862 863 s2 = splserial(); 864 COM_LOCK(sc); 865 866 /* 867 * Turn on DTR. We must always do this, even if carrier is not 868 * present, because otherwise we'd have to use TIOCSDTR 869 * immediately after setting CLOCAL, which applications do not 870 * expect. We always assert DTR while the device is open 871 * unless explicitly requested to deassert it. 872 */ 873 com_modem(sc, 1); 874 875 /* Clear the input ring, and unblock. */ 876 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 877 sc->sc_rbavail = com_rbuf_size; 878 com_iflush(sc); 879 CLR(sc->sc_rx_flags, RX_ANY_BLOCK); 880 com_hwiflow(sc); 881 882 #ifdef COM_DEBUG 883 if (com_debug) 884 comstatus(sc, "comopen "); 885 #endif 886 887 COM_UNLOCK(sc); 888 splx(s2); 889 } 890 891 splx(s); 892 893 error = ttyopen(tp, COMDIALOUT(dev), ISSET(flag, O_NONBLOCK)); 894 if (error) 895 goto bad; 896 897 error = (*tp->t_linesw->l_open)(dev, tp); 898 if (error) 899 goto bad; 900 901 return (0); 902 903 bad: 904 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 905 /* 906 * We failed to open the device, and nobody else had it opened. 907 * Clean up the state as appropriate. 908 */ 909 com_shutdown(sc); 910 } 911 912 return (error); 913 } 914 915 int 916 comclose(dev_t dev, int flag, int mode, struct proc *p) 917 { 918 struct com_softc *sc = device_lookup(&com_cd, COMUNIT(dev)); 919 struct tty *tp = sc->sc_tty; 920 921 /* XXX This is for cons.c. */ 922 if (!ISSET(tp->t_state, TS_ISOPEN)) 923 return (0); 924 925 (*tp->t_linesw->l_close)(tp, flag); 926 ttyclose(tp); 927 928 if (COM_ISALIVE(sc) == 0) 929 return (0); 930 931 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 932 /* 933 * Although we got a last close, the device may still be in 934 * use; e.g. if this was the dialout node, and there are still 935 * processes waiting for carrier on the non-dialout node. 936 */ 937 com_shutdown(sc); 938 } 939 940 return (0); 941 } 942 943 int 944 comread(dev_t dev, struct uio *uio, int flag) 945 { 946 struct com_softc *sc = device_lookup(&com_cd, COMUNIT(dev)); 947 struct tty *tp = sc->sc_tty; 948 949 if (COM_ISALIVE(sc) == 0) 950 return (EIO); 951 952 return ((*tp->t_linesw->l_read)(tp, uio, flag)); 953 } 954 955 int 956 comwrite(dev_t dev, struct uio *uio, int flag) 957 { 958 struct com_softc *sc = device_lookup(&com_cd, COMUNIT(dev)); 959 struct tty *tp = sc->sc_tty; 960 961 if (COM_ISALIVE(sc) == 0) 962 return (EIO); 963 964 return ((*tp->t_linesw->l_write)(tp, uio, flag)); 965 } 966 967 int 968 compoll(dev_t dev, int events, struct proc *p) 969 { 970 struct com_softc *sc = device_lookup(&com_cd, COMUNIT(dev)); 971 struct tty *tp = sc->sc_tty; 972 973 if (COM_ISALIVE(sc) == 0) 974 return (EIO); 975 976 return ((*tp->t_linesw->l_poll)(tp, events, p)); 977 } 978 979 struct tty * 980 comtty(dev_t dev) 981 { 982 struct com_softc *sc = device_lookup(&com_cd, COMUNIT(dev)); 983 struct tty *tp = sc->sc_tty; 984 985 return (tp); 986 } 987 988 int 989 comioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p) 990 { 991 struct com_softc *sc = device_lookup(&com_cd, COMUNIT(dev)); 992 struct tty *tp = sc->sc_tty; 993 int error; 994 int s; 995 996 if (COM_ISALIVE(sc) == 0) 997 return (EIO); 998 999 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, p); 1000 if (error != EPASSTHROUGH) 1001 return (error); 1002 1003 error = ttioctl(tp, cmd, data, flag, p); 1004 if (error != EPASSTHROUGH) 1005 return (error); 1006 1007 error = 0; 1008 1009 s = splserial(); 1010 COM_LOCK(sc); 1011 1012 switch (cmd) { 1013 case TIOCSBRK: 1014 com_break(sc, 1); 1015 break; 1016 1017 case TIOCCBRK: 1018 com_break(sc, 0); 1019 break; 1020 1021 case TIOCSDTR: 1022 com_modem(sc, 1); 1023 break; 1024 1025 case TIOCCDTR: 1026 com_modem(sc, 0); 1027 break; 1028 1029 case TIOCGFLAGS: 1030 *(int *)data = sc->sc_swflags; 1031 break; 1032 1033 case TIOCSFLAGS: 1034 error = suser(p->p_ucred, &p->p_acflag); 1035 if (error) 1036 break; 1037 sc->sc_swflags = *(int *)data; 1038 break; 1039 1040 case TIOCMSET: 1041 case TIOCMBIS: 1042 case TIOCMBIC: 1043 tiocm_to_com(sc, cmd, *(int *)data); 1044 break; 1045 1046 case TIOCMGET: 1047 *(int *)data = com_to_tiocm(sc); 1048 break; 1049 1050 case PPS_IOC_CREATE: 1051 break; 1052 1053 case PPS_IOC_DESTROY: 1054 break; 1055 1056 case PPS_IOC_GETPARAMS: { 1057 pps_params_t *pp; 1058 pp = (pps_params_t *)data; 1059 *pp = sc->ppsparam; 1060 break; 1061 } 1062 1063 case PPS_IOC_SETPARAMS: { 1064 pps_params_t *pp; 1065 int mode; 1066 pp = (pps_params_t *)data; 1067 if (pp->mode & ~ppscap) { 1068 error = EINVAL; 1069 break; 1070 } 1071 sc->ppsparam = *pp; 1072 /* 1073 * Compute msr masks from user-specified timestamp state. 1074 */ 1075 mode = sc->ppsparam.mode; 1076 #ifdef PPS_SYNC 1077 if (mode & PPS_HARDPPSONASSERT) { 1078 mode |= PPS_CAPTUREASSERT; 1079 /* XXX revoke any previous HARDPPS source */ 1080 } 1081 if (mode & PPS_HARDPPSONCLEAR) { 1082 mode |= PPS_CAPTURECLEAR; 1083 /* XXX revoke any previous HARDPPS source */ 1084 } 1085 #endif /* PPS_SYNC */ 1086 switch (mode & PPS_CAPTUREBOTH) { 1087 case 0: 1088 sc->sc_ppsmask = 0; 1089 break; 1090 1091 case PPS_CAPTUREASSERT: 1092 sc->sc_ppsmask = MSR_DCD; 1093 sc->sc_ppsassert = MSR_DCD; 1094 sc->sc_ppsclear = -1; 1095 break; 1096 1097 case PPS_CAPTURECLEAR: 1098 sc->sc_ppsmask = MSR_DCD; 1099 sc->sc_ppsassert = -1; 1100 sc->sc_ppsclear = 0; 1101 break; 1102 1103 case PPS_CAPTUREBOTH: 1104 sc->sc_ppsmask = MSR_DCD; 1105 sc->sc_ppsassert = MSR_DCD; 1106 sc->sc_ppsclear = 0; 1107 break; 1108 1109 default: 1110 error = EINVAL; 1111 break; 1112 } 1113 break; 1114 } 1115 1116 case PPS_IOC_GETCAP: 1117 *(int*)data = ppscap; 1118 break; 1119 1120 case PPS_IOC_FETCH: { 1121 pps_info_t *pi; 1122 pi = (pps_info_t *)data; 1123 *pi = sc->ppsinfo; 1124 break; 1125 } 1126 1127 case TIOCDCDTIMESTAMP: /* XXX old, overloaded API used by xntpd v3 */ 1128 /* 1129 * Some GPS clocks models use the falling rather than 1130 * rising edge as the on-the-second signal. 1131 * The old API has no way to specify PPS polarity. 1132 */ 1133 sc->sc_ppsmask = MSR_DCD; 1134 #ifndef PPS_TRAILING_EDGE 1135 sc->sc_ppsassert = MSR_DCD; 1136 sc->sc_ppsclear = -1; 1137 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 1138 &sc->ppsinfo.assert_timestamp); 1139 #else 1140 sc->sc_ppsassert = -1 1141 sc->sc_ppsclear = 0; 1142 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 1143 &sc->ppsinfo.clear_timestamp); 1144 #endif 1145 break; 1146 1147 default: 1148 error = EPASSTHROUGH; 1149 break; 1150 } 1151 1152 COM_UNLOCK(sc); 1153 splx(s); 1154 1155 #ifdef COM_DEBUG 1156 if (com_debug) 1157 comstatus(sc, "comioctl "); 1158 #endif 1159 1160 return (error); 1161 } 1162 1163 integrate void 1164 com_schedrx(struct com_softc *sc) 1165 { 1166 1167 sc->sc_rx_ready = 1; 1168 1169 /* Wake up the poller. */ 1170 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 1171 softintr_schedule(sc->sc_si); 1172 #else 1173 #ifndef __NO_SOFT_SERIAL_INTERRUPT 1174 setsoftserial(); 1175 #else 1176 if (!com_softintr_scheduled) { 1177 com_softintr_scheduled = 1; 1178 callout_reset(&comsoft_callout, 1, comsoft, NULL); 1179 } 1180 #endif 1181 #endif 1182 } 1183 1184 void 1185 com_break(struct com_softc *sc, int onoff) 1186 { 1187 1188 if (onoff) 1189 SET(sc->sc_lcr, LCR_SBREAK); 1190 else 1191 CLR(sc->sc_lcr, LCR_SBREAK); 1192 1193 if (!sc->sc_heldchange) { 1194 if (sc->sc_tx_busy) { 1195 sc->sc_heldtbc = sc->sc_tbc; 1196 sc->sc_tbc = 0; 1197 sc->sc_heldchange = 1; 1198 } else 1199 com_loadchannelregs(sc); 1200 } 1201 } 1202 1203 void 1204 com_modem(struct com_softc *sc, int onoff) 1205 { 1206 1207 if (sc->sc_mcr_dtr == 0) 1208 return; 1209 1210 if (onoff) 1211 SET(sc->sc_mcr, sc->sc_mcr_dtr); 1212 else 1213 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 1214 1215 if (!sc->sc_heldchange) { 1216 if (sc->sc_tx_busy) { 1217 sc->sc_heldtbc = sc->sc_tbc; 1218 sc->sc_tbc = 0; 1219 sc->sc_heldchange = 1; 1220 } else 1221 com_loadchannelregs(sc); 1222 } 1223 } 1224 1225 void 1226 tiocm_to_com(struct com_softc *sc, u_long how, int ttybits) 1227 { 1228 u_char combits; 1229 1230 combits = 0; 1231 if (ISSET(ttybits, TIOCM_DTR)) 1232 SET(combits, MCR_DTR); 1233 if (ISSET(ttybits, TIOCM_RTS)) 1234 SET(combits, MCR_RTS); 1235 1236 switch (how) { 1237 case TIOCMBIC: 1238 CLR(sc->sc_mcr, combits); 1239 break; 1240 1241 case TIOCMBIS: 1242 SET(sc->sc_mcr, combits); 1243 break; 1244 1245 case TIOCMSET: 1246 CLR(sc->sc_mcr, MCR_DTR | MCR_RTS); 1247 SET(sc->sc_mcr, combits); 1248 break; 1249 } 1250 1251 if (!sc->sc_heldchange) { 1252 if (sc->sc_tx_busy) { 1253 sc->sc_heldtbc = sc->sc_tbc; 1254 sc->sc_tbc = 0; 1255 sc->sc_heldchange = 1; 1256 } else 1257 com_loadchannelregs(sc); 1258 } 1259 } 1260 1261 int 1262 com_to_tiocm(struct com_softc *sc) 1263 { 1264 u_char combits; 1265 int ttybits = 0; 1266 1267 combits = sc->sc_mcr; 1268 if (ISSET(combits, MCR_DTR)) 1269 SET(ttybits, TIOCM_DTR); 1270 if (ISSET(combits, MCR_RTS)) 1271 SET(ttybits, TIOCM_RTS); 1272 1273 combits = sc->sc_msr; 1274 if (ISSET(combits, MSR_DCD)) 1275 SET(ttybits, TIOCM_CD); 1276 if (ISSET(combits, MSR_CTS)) 1277 SET(ttybits, TIOCM_CTS); 1278 if (ISSET(combits, MSR_DSR)) 1279 SET(ttybits, TIOCM_DSR); 1280 if (ISSET(combits, MSR_RI | MSR_TERI)) 1281 SET(ttybits, TIOCM_RI); 1282 1283 if (sc->sc_ier != 0) 1284 SET(ttybits, TIOCM_LE); 1285 1286 return (ttybits); 1287 } 1288 1289 static u_char 1290 cflag2lcr(tcflag_t cflag) 1291 { 1292 u_char lcr = 0; 1293 1294 switch (ISSET(cflag, CSIZE)) { 1295 case CS5: 1296 SET(lcr, LCR_5BITS); 1297 break; 1298 case CS6: 1299 SET(lcr, LCR_6BITS); 1300 break; 1301 case CS7: 1302 SET(lcr, LCR_7BITS); 1303 break; 1304 case CS8: 1305 SET(lcr, LCR_8BITS); 1306 break; 1307 } 1308 if (ISSET(cflag, PARENB)) { 1309 SET(lcr, LCR_PENAB); 1310 if (!ISSET(cflag, PARODD)) 1311 SET(lcr, LCR_PEVEN); 1312 } 1313 if (ISSET(cflag, CSTOPB)) 1314 SET(lcr, LCR_STOPB); 1315 1316 return (lcr); 1317 } 1318 1319 int 1320 comparam(struct tty *tp, struct termios *t) 1321 { 1322 struct com_softc *sc = device_lookup(&com_cd, COMUNIT(tp->t_dev)); 1323 int ospeed; 1324 u_char lcr; 1325 int s; 1326 1327 if (COM_ISALIVE(sc) == 0) 1328 return (EIO); 1329 1330 #ifdef COM_HAYESP 1331 if (ISSET(sc->sc_hwflags, COM_HW_HAYESP)) { 1332 int prescaler, speed; 1333 1334 /* 1335 * Calculate UART clock prescaler. It should be in 1336 * range of 0 .. 3. 1337 */ 1338 for (prescaler = 0, speed = t->c_ospeed; prescaler < 4; 1339 prescaler++, speed /= 2) 1340 if ((ospeed = comspeed(speed, sc->sc_frequency)) > 0) 1341 break; 1342 1343 if (prescaler == 4) 1344 return (EINVAL); 1345 sc->sc_prescaler = prescaler; 1346 } else 1347 #endif 1348 ospeed = comspeed(t->c_ospeed, sc->sc_frequency); 1349 1350 /* Check requested parameters. */ 1351 if (ospeed < 0) 1352 return (EINVAL); 1353 if (t->c_ispeed && t->c_ispeed != t->c_ospeed) 1354 return (EINVAL); 1355 1356 /* 1357 * For the console, always force CLOCAL and !HUPCL, so that the port 1358 * is always active. 1359 */ 1360 if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) || 1361 ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 1362 SET(t->c_cflag, CLOCAL); 1363 CLR(t->c_cflag, HUPCL); 1364 } 1365 1366 /* 1367 * If there were no changes, don't do anything. This avoids dropping 1368 * input and improves performance when all we did was frob things like 1369 * VMIN and VTIME. 1370 */ 1371 if (tp->t_ospeed == t->c_ospeed && 1372 tp->t_cflag == t->c_cflag) 1373 return (0); 1374 1375 lcr = ISSET(sc->sc_lcr, LCR_SBREAK) | cflag2lcr(t->c_cflag); 1376 1377 s = splserial(); 1378 COM_LOCK(sc); 1379 1380 sc->sc_lcr = lcr; 1381 1382 /* 1383 * If we're not in a mode that assumes a connection is present, then 1384 * ignore carrier changes. 1385 */ 1386 if (ISSET(t->c_cflag, CLOCAL | MDMBUF)) 1387 sc->sc_msr_dcd = 0; 1388 else 1389 sc->sc_msr_dcd = MSR_DCD; 1390 /* 1391 * Set the flow control pins depending on the current flow control 1392 * mode. 1393 */ 1394 if (ISSET(t->c_cflag, CRTSCTS)) { 1395 sc->sc_mcr_dtr = MCR_DTR; 1396 sc->sc_mcr_rts = MCR_RTS; 1397 sc->sc_msr_cts = MSR_CTS; 1398 sc->sc_efr = EFR_AUTORTS | EFR_AUTOCTS; 1399 } else if (ISSET(t->c_cflag, MDMBUF)) { 1400 /* 1401 * For DTR/DCD flow control, make sure we don't toggle DTR for 1402 * carrier detection. 1403 */ 1404 sc->sc_mcr_dtr = 0; 1405 sc->sc_mcr_rts = MCR_DTR; 1406 sc->sc_msr_cts = MSR_DCD; 1407 sc->sc_efr = 0; 1408 } else { 1409 /* 1410 * If no flow control, then always set RTS. This will make 1411 * the other side happy if it mistakenly thinks we're doing 1412 * RTS/CTS flow control. 1413 */ 1414 sc->sc_mcr_dtr = MCR_DTR | MCR_RTS; 1415 sc->sc_mcr_rts = 0; 1416 sc->sc_msr_cts = 0; 1417 sc->sc_efr = 0; 1418 if (ISSET(sc->sc_mcr, MCR_DTR)) 1419 SET(sc->sc_mcr, MCR_RTS); 1420 else 1421 CLR(sc->sc_mcr, MCR_RTS); 1422 } 1423 sc->sc_msr_mask = sc->sc_msr_cts | sc->sc_msr_dcd; 1424 1425 #if 0 1426 if (ospeed == 0) 1427 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 1428 else 1429 SET(sc->sc_mcr, sc->sc_mcr_dtr); 1430 #endif 1431 1432 sc->sc_dlbl = ospeed; 1433 sc->sc_dlbh = ospeed >> 8; 1434 1435 /* 1436 * Set the FIFO threshold based on the receive speed. 1437 * 1438 * * If it's a low speed, it's probably a mouse or some other 1439 * interactive device, so set the threshold low. 1440 * * If it's a high speed, trim the trigger level down to prevent 1441 * overflows. 1442 * * Otherwise set it a bit higher. 1443 */ 1444 if (ISSET(sc->sc_hwflags, COM_HW_HAYESP)) 1445 sc->sc_fifo = FIFO_DMA_MODE | FIFO_ENABLE | FIFO_TRIGGER_8; 1446 else if (ISSET(sc->sc_hwflags, COM_HW_FIFO)) 1447 sc->sc_fifo = FIFO_ENABLE | 1448 (t->c_ospeed <= 1200 ? FIFO_TRIGGER_1 : 1449 t->c_ospeed <= 38400 ? FIFO_TRIGGER_8 : FIFO_TRIGGER_4); 1450 else 1451 sc->sc_fifo = 0; 1452 1453 /* And copy to tty. */ 1454 tp->t_ispeed = 0; 1455 tp->t_ospeed = t->c_ospeed; 1456 tp->t_cflag = t->c_cflag; 1457 1458 if (!sc->sc_heldchange) { 1459 if (sc->sc_tx_busy) { 1460 sc->sc_heldtbc = sc->sc_tbc; 1461 sc->sc_tbc = 0; 1462 sc->sc_heldchange = 1; 1463 } else 1464 com_loadchannelregs(sc); 1465 } 1466 1467 if (!ISSET(t->c_cflag, CHWFLOW)) { 1468 /* Disable the high water mark. */ 1469 sc->sc_r_hiwat = 0; 1470 sc->sc_r_lowat = 0; 1471 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1472 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1473 com_schedrx(sc); 1474 } 1475 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 1476 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 1477 com_hwiflow(sc); 1478 } 1479 } else { 1480 sc->sc_r_hiwat = com_rbuf_hiwat; 1481 sc->sc_r_lowat = com_rbuf_lowat; 1482 } 1483 1484 COM_UNLOCK(sc); 1485 splx(s); 1486 1487 /* 1488 * Update the tty layer's idea of the carrier bit, in case we changed 1489 * CLOCAL or MDMBUF. We don't hang up here; we only do that by 1490 * explicit request. 1491 */ 1492 (void) (*tp->t_linesw->l_modem)(tp, ISSET(sc->sc_msr, MSR_DCD)); 1493 1494 #ifdef COM_DEBUG 1495 if (com_debug) 1496 comstatus(sc, "comparam "); 1497 #endif 1498 1499 if (!ISSET(t->c_cflag, CHWFLOW)) { 1500 if (sc->sc_tx_stopped) { 1501 sc->sc_tx_stopped = 0; 1502 comstart(tp); 1503 } 1504 } 1505 1506 return (0); 1507 } 1508 1509 void 1510 com_iflush(struct com_softc *sc) 1511 { 1512 bus_space_tag_t iot = sc->sc_iot; 1513 bus_space_handle_t ioh = sc->sc_ioh; 1514 #ifdef DIAGNOSTIC 1515 int reg; 1516 #endif 1517 int timo; 1518 1519 #ifdef DIAGNOSTIC 1520 reg = 0xffff; 1521 #endif 1522 timo = 50000; 1523 /* flush any pending I/O */ 1524 while (ISSET(bus_space_read_1(iot, ioh, com_lsr), LSR_RXRDY) 1525 && --timo) 1526 #ifdef DIAGNOSTIC 1527 reg = 1528 #else 1529 (void) 1530 #endif 1531 bus_space_read_1(iot, ioh, com_data); 1532 #ifdef DIAGNOSTIC 1533 if (!timo) 1534 printf("%s: com_iflush timeout %02x\n", sc->sc_dev.dv_xname, 1535 reg); 1536 #endif 1537 } 1538 1539 void 1540 com_loadchannelregs(struct com_softc *sc) 1541 { 1542 bus_space_tag_t iot = sc->sc_iot; 1543 bus_space_handle_t ioh = sc->sc_ioh; 1544 1545 /* XXXXX necessary? */ 1546 com_iflush(sc); 1547 1548 bus_space_write_1(iot, ioh, com_ier, 0); 1549 1550 if (ISSET(sc->sc_hwflags, COM_HW_FLOW)) { 1551 bus_space_write_1(iot, ioh, com_lcr, LCR_EERS); 1552 bus_space_write_1(iot, ioh, com_efr, sc->sc_efr); 1553 } 1554 bus_space_write_1(iot, ioh, com_lcr, sc->sc_lcr | LCR_DLAB); 1555 bus_space_write_1(iot, ioh, com_dlbl, sc->sc_dlbl); 1556 bus_space_write_1(iot, ioh, com_dlbh, sc->sc_dlbh); 1557 bus_space_write_1(iot, ioh, com_lcr, sc->sc_lcr); 1558 bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr_active = sc->sc_mcr); 1559 bus_space_write_1(iot, ioh, com_fifo, sc->sc_fifo); 1560 #ifdef COM_HAYESP 1561 if (ISSET(sc->sc_hwflags, COM_HW_HAYESP)) { 1562 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD1, 1563 HAYESP_SETPRESCALER); 1564 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 1565 sc->sc_prescaler); 1566 } 1567 #endif 1568 1569 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1570 } 1571 1572 int 1573 comhwiflow(struct tty *tp, int block) 1574 { 1575 struct com_softc *sc = device_lookup(&com_cd, COMUNIT(tp->t_dev)); 1576 int s; 1577 1578 if (COM_ISALIVE(sc) == 0) 1579 return (0); 1580 1581 if (sc->sc_mcr_rts == 0) 1582 return (0); 1583 1584 s = splserial(); 1585 COM_LOCK(sc); 1586 1587 if (block) { 1588 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1589 SET(sc->sc_rx_flags, RX_TTY_BLOCKED); 1590 com_hwiflow(sc); 1591 } 1592 } else { 1593 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1594 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1595 com_schedrx(sc); 1596 } 1597 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1598 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED); 1599 com_hwiflow(sc); 1600 } 1601 } 1602 1603 COM_UNLOCK(sc); 1604 splx(s); 1605 return (1); 1606 } 1607 1608 /* 1609 * (un)block input via hw flowcontrol 1610 */ 1611 void 1612 com_hwiflow(struct com_softc *sc) 1613 { 1614 bus_space_tag_t iot = sc->sc_iot; 1615 bus_space_handle_t ioh = sc->sc_ioh; 1616 1617 if (sc->sc_mcr_rts == 0) 1618 return; 1619 1620 if (ISSET(sc->sc_rx_flags, RX_ANY_BLOCK)) { 1621 CLR(sc->sc_mcr, sc->sc_mcr_rts); 1622 CLR(sc->sc_mcr_active, sc->sc_mcr_rts); 1623 } else { 1624 SET(sc->sc_mcr, sc->sc_mcr_rts); 1625 SET(sc->sc_mcr_active, sc->sc_mcr_rts); 1626 } 1627 bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr_active); 1628 } 1629 1630 1631 void 1632 comstart(struct tty *tp) 1633 { 1634 struct com_softc *sc = device_lookup(&com_cd, COMUNIT(tp->t_dev)); 1635 bus_space_tag_t iot = sc->sc_iot; 1636 bus_space_handle_t ioh = sc->sc_ioh; 1637 int s; 1638 1639 if (COM_ISALIVE(sc) == 0) 1640 return; 1641 1642 s = spltty(); 1643 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 1644 goto out; 1645 if (sc->sc_tx_stopped) 1646 goto out; 1647 1648 if (tp->t_outq.c_cc <= tp->t_lowat) { 1649 if (ISSET(tp->t_state, TS_ASLEEP)) { 1650 CLR(tp->t_state, TS_ASLEEP); 1651 wakeup(&tp->t_outq); 1652 } 1653 selwakeup(&tp->t_wsel); 1654 if (tp->t_outq.c_cc == 0) 1655 goto out; 1656 } 1657 1658 /* Grab the first contiguous region of buffer space. */ 1659 { 1660 u_char *tba; 1661 int tbc; 1662 1663 tba = tp->t_outq.c_cf; 1664 tbc = ndqb(&tp->t_outq, 0); 1665 1666 (void)splserial(); 1667 COM_LOCK(sc); 1668 1669 sc->sc_tba = tba; 1670 sc->sc_tbc = tbc; 1671 } 1672 1673 SET(tp->t_state, TS_BUSY); 1674 sc->sc_tx_busy = 1; 1675 1676 /* Enable transmit completion interrupts if necessary. */ 1677 if (!ISSET(sc->sc_ier, IER_ETXRDY)) { 1678 SET(sc->sc_ier, IER_ETXRDY); 1679 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1680 } 1681 1682 /* Output the first chunk of the contiguous buffer. */ 1683 if (!ISSET(sc->sc_hwflags, COM_HW_NO_TXPRELOAD)) { 1684 int n; 1685 1686 n = sc->sc_tbc; 1687 if (n > sc->sc_fifolen) 1688 n = sc->sc_fifolen; 1689 bus_space_write_multi_1(iot, ioh, com_data, sc->sc_tba, n); 1690 sc->sc_tbc -= n; 1691 sc->sc_tba += n; 1692 } 1693 COM_UNLOCK(sc); 1694 out: 1695 splx(s); 1696 return; 1697 } 1698 1699 /* 1700 * Stop output on a line. 1701 */ 1702 void 1703 comstop(struct tty *tp, int flag) 1704 { 1705 struct com_softc *sc = device_lookup(&com_cd, COMUNIT(tp->t_dev)); 1706 int s; 1707 1708 s = splserial(); 1709 COM_LOCK(sc); 1710 if (ISSET(tp->t_state, TS_BUSY)) { 1711 /* Stop transmitting at the next chunk. */ 1712 sc->sc_tbc = 0; 1713 sc->sc_heldtbc = 0; 1714 if (!ISSET(tp->t_state, TS_TTSTOP)) 1715 SET(tp->t_state, TS_FLUSH); 1716 } 1717 COM_UNLOCK(sc); 1718 splx(s); 1719 } 1720 1721 void 1722 comdiag(void *arg) 1723 { 1724 struct com_softc *sc = arg; 1725 int overflows, floods; 1726 int s; 1727 1728 s = splserial(); 1729 COM_LOCK(sc); 1730 overflows = sc->sc_overflows; 1731 sc->sc_overflows = 0; 1732 floods = sc->sc_floods; 1733 sc->sc_floods = 0; 1734 sc->sc_errors = 0; 1735 COM_UNLOCK(sc); 1736 splx(s); 1737 1738 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1739 sc->sc_dev.dv_xname, 1740 overflows, overflows == 1 ? "" : "s", 1741 floods, floods == 1 ? "" : "s"); 1742 } 1743 1744 integrate void 1745 com_rxsoft(struct com_softc *sc, struct tty *tp) 1746 { 1747 int (*rint)(int c, struct tty *tp) = tp->t_linesw->l_rint; 1748 u_char *get, *end; 1749 u_int cc, scc; 1750 u_char lsr; 1751 int code; 1752 int s; 1753 1754 end = sc->sc_ebuf; 1755 get = sc->sc_rbget; 1756 scc = cc = com_rbuf_size - sc->sc_rbavail; 1757 1758 if (cc == com_rbuf_size) { 1759 sc->sc_floods++; 1760 if (sc->sc_errors++ == 0) 1761 callout_reset(&sc->sc_diag_callout, 60 * hz, 1762 comdiag, sc); 1763 } 1764 1765 while (cc) { 1766 code = get[0]; 1767 lsr = get[1]; 1768 if (ISSET(lsr, LSR_OE | LSR_BI | LSR_FE | LSR_PE)) { 1769 if (ISSET(lsr, LSR_OE)) { 1770 sc->sc_overflows++; 1771 if (sc->sc_errors++ == 0) 1772 callout_reset(&sc->sc_diag_callout, 1773 60 * hz, comdiag, sc); 1774 } 1775 if (ISSET(lsr, LSR_BI | LSR_FE)) 1776 SET(code, TTY_FE); 1777 if (ISSET(lsr, LSR_PE)) 1778 SET(code, TTY_PE); 1779 } 1780 if ((*rint)(code, tp) == -1) { 1781 /* 1782 * The line discipline's buffer is out of space. 1783 */ 1784 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1785 /* 1786 * We're either not using flow control, or the 1787 * line discipline didn't tell us to block for 1788 * some reason. Either way, we have no way to 1789 * know when there's more space available, so 1790 * just drop the rest of the data. 1791 */ 1792 get += cc << 1; 1793 if (get >= end) 1794 get -= com_rbuf_size << 1; 1795 cc = 0; 1796 } else { 1797 /* 1798 * Don't schedule any more receive processing 1799 * until the line discipline tells us there's 1800 * space available (through comhwiflow()). 1801 * Leave the rest of the data in the input 1802 * buffer. 1803 */ 1804 SET(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1805 } 1806 break; 1807 } 1808 get += 2; 1809 if (get >= end) 1810 get = sc->sc_rbuf; 1811 cc--; 1812 } 1813 1814 if (cc != scc) { 1815 sc->sc_rbget = get; 1816 s = splserial(); 1817 COM_LOCK(sc); 1818 1819 cc = sc->sc_rbavail += scc - cc; 1820 /* Buffers should be ok again, release possible block. */ 1821 if (cc >= sc->sc_r_lowat) { 1822 if (ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1823 CLR(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1824 SET(sc->sc_ier, IER_ERXRDY); 1825 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 1826 } 1827 if (ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED)) { 1828 CLR(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1829 com_hwiflow(sc); 1830 } 1831 } 1832 COM_UNLOCK(sc); 1833 splx(s); 1834 } 1835 } 1836 1837 integrate void 1838 com_txsoft(struct com_softc *sc, struct tty *tp) 1839 { 1840 1841 CLR(tp->t_state, TS_BUSY); 1842 if (ISSET(tp->t_state, TS_FLUSH)) 1843 CLR(tp->t_state, TS_FLUSH); 1844 else 1845 ndflush(&tp->t_outq, (int)(sc->sc_tba - tp->t_outq.c_cf)); 1846 (*tp->t_linesw->l_start)(tp); 1847 } 1848 1849 integrate void 1850 com_stsoft(struct com_softc *sc, struct tty *tp) 1851 { 1852 u_char msr, delta; 1853 int s; 1854 1855 s = splserial(); 1856 COM_LOCK(sc); 1857 msr = sc->sc_msr; 1858 delta = sc->sc_msr_delta; 1859 sc->sc_msr_delta = 0; 1860 COM_UNLOCK(sc); 1861 splx(s); 1862 1863 if (ISSET(delta, sc->sc_msr_dcd)) { 1864 /* 1865 * Inform the tty layer that carrier detect changed. 1866 */ 1867 (void) (*tp->t_linesw->l_modem)(tp, ISSET(msr, MSR_DCD)); 1868 } 1869 1870 if (ISSET(delta, sc->sc_msr_cts)) { 1871 /* Block or unblock output according to flow control. */ 1872 if (ISSET(msr, sc->sc_msr_cts)) { 1873 sc->sc_tx_stopped = 0; 1874 (*tp->t_linesw->l_start)(tp); 1875 } else { 1876 sc->sc_tx_stopped = 1; 1877 } 1878 } 1879 1880 #ifdef COM_DEBUG 1881 if (com_debug) 1882 comstatus(sc, "com_stsoft"); 1883 #endif 1884 } 1885 1886 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 1887 void 1888 comsoft(void *arg) 1889 { 1890 struct com_softc *sc = arg; 1891 struct tty *tp; 1892 1893 if (COM_ISALIVE(sc) == 0) 1894 return; 1895 1896 { 1897 #else 1898 void 1899 #ifndef __NO_SOFT_SERIAL_INTERRUPT 1900 comsoft(void) 1901 #else 1902 comsoft(void *arg) 1903 #endif 1904 { 1905 struct com_softc *sc; 1906 struct tty *tp; 1907 int unit; 1908 #ifdef __NO_SOFT_SERIAL_INTERRUPT 1909 int s; 1910 1911 s = splsoftserial(); 1912 com_softintr_scheduled = 0; 1913 #endif 1914 1915 for (unit = 0; unit < com_cd.cd_ndevs; unit++) { 1916 sc = device_lookup(&com_cd, unit); 1917 if (sc == NULL || !ISSET(sc->sc_hwflags, COM_HW_DEV_OK)) 1918 continue; 1919 1920 if (COM_ISALIVE(sc) == 0) 1921 continue; 1922 1923 tp = sc->sc_tty; 1924 if (tp == NULL) 1925 continue; 1926 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) 1927 continue; 1928 #endif 1929 tp = sc->sc_tty; 1930 1931 if (sc->sc_rx_ready) { 1932 sc->sc_rx_ready = 0; 1933 com_rxsoft(sc, tp); 1934 } 1935 1936 if (sc->sc_st_check) { 1937 sc->sc_st_check = 0; 1938 com_stsoft(sc, tp); 1939 } 1940 1941 if (sc->sc_tx_done) { 1942 sc->sc_tx_done = 0; 1943 com_txsoft(sc, tp); 1944 } 1945 } 1946 1947 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS 1948 #ifdef __NO_SOFT_SERIAL_INTERRUPT 1949 splx(s); 1950 #endif 1951 #endif 1952 } 1953 1954 #ifdef __ALIGN_BRACKET_LEVEL_FOR_CTAGS 1955 /* there has got to be a better way to do comsoft() */ 1956 }} 1957 #endif 1958 1959 int 1960 comintr(void *arg) 1961 { 1962 struct com_softc *sc = arg; 1963 bus_space_tag_t iot = sc->sc_iot; 1964 bus_space_handle_t ioh = sc->sc_ioh; 1965 u_char *put, *end; 1966 u_int cc; 1967 u_char lsr, iir; 1968 1969 if (COM_ISALIVE(sc) == 0) 1970 return (0); 1971 1972 COM_LOCK(sc); 1973 iir = bus_space_read_1(iot, ioh, com_iir); 1974 if (ISSET(iir, IIR_NOPEND)) { 1975 COM_UNLOCK(sc); 1976 return (0); 1977 } 1978 1979 end = sc->sc_ebuf; 1980 put = sc->sc_rbput; 1981 cc = sc->sc_rbavail; 1982 1983 again: do { 1984 u_char msr, delta; 1985 1986 lsr = bus_space_read_1(iot, ioh, com_lsr); 1987 if (ISSET(lsr, LSR_BI)) { 1988 int cn_trapped = 0; 1989 cn_check_magic(sc->sc_tty->t_dev, 1990 CNC_BREAK, com_cnm_state); 1991 if (cn_trapped) 1992 continue; 1993 #if defined(KGDB) 1994 if (ISSET(sc->sc_hwflags, COM_HW_KGDB)) { 1995 kgdb_connect(1); 1996 continue; 1997 } 1998 #endif 1999 } 2000 2001 if (ISSET(lsr, LSR_RCV_MASK) && 2002 !ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 2003 while (cc > 0) { 2004 int cn_trapped = 0; 2005 put[0] = bus_space_read_1(iot, ioh, com_data); 2006 put[1] = lsr; 2007 cn_check_magic(sc->sc_tty->t_dev, 2008 put[0], com_cnm_state); 2009 if (cn_trapped) { 2010 lsr = bus_space_read_1(iot, ioh, com_lsr); 2011 if (!ISSET(lsr, LSR_RCV_MASK)) 2012 break; 2013 2014 continue; 2015 } 2016 put += 2; 2017 if (put >= end) 2018 put = sc->sc_rbuf; 2019 cc--; 2020 2021 lsr = bus_space_read_1(iot, ioh, com_lsr); 2022 if (!ISSET(lsr, LSR_RCV_MASK)) 2023 break; 2024 } 2025 2026 /* 2027 * Current string of incoming characters ended because 2028 * no more data was available or we ran out of space. 2029 * Schedule a receive event if any data was received. 2030 * If we're out of space, turn off receive interrupts. 2031 */ 2032 sc->sc_rbput = put; 2033 sc->sc_rbavail = cc; 2034 if (!ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) 2035 sc->sc_rx_ready = 1; 2036 2037 /* 2038 * See if we are in danger of overflowing a buffer. If 2039 * so, use hardware flow control to ease the pressure. 2040 */ 2041 if (!ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED) && 2042 cc < sc->sc_r_hiwat) { 2043 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 2044 com_hwiflow(sc); 2045 } 2046 2047 /* 2048 * If we're out of space, disable receive interrupts 2049 * until the queue has drained a bit. 2050 */ 2051 if (!cc) { 2052 SET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 2053 CLR(sc->sc_ier, IER_ERXRDY); 2054 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 2055 } 2056 } else { 2057 if ((iir & IIR_IMASK) == IIR_RXRDY) { 2058 bus_space_write_1(iot, ioh, com_ier, 0); 2059 delay(10); 2060 bus_space_write_1(iot, ioh, com_ier,sc->sc_ier); 2061 continue; 2062 } 2063 } 2064 2065 msr = bus_space_read_1(iot, ioh, com_msr); 2066 delta = msr ^ sc->sc_msr; 2067 sc->sc_msr = msr; 2068 /* 2069 * Pulse-per-second (PSS) signals on edge of DCD? 2070 * Process these even if line discipline is ignoring DCD. 2071 */ 2072 if (delta & sc->sc_ppsmask) { 2073 struct timeval tv; 2074 if ((msr & sc->sc_ppsmask) == sc->sc_ppsassert) { 2075 /* XXX nanotime() */ 2076 microtime(&tv); 2077 TIMEVAL_TO_TIMESPEC(&tv, 2078 &sc->ppsinfo.assert_timestamp); 2079 if (sc->ppsparam.mode & PPS_OFFSETASSERT) { 2080 timespecadd(&sc->ppsinfo.assert_timestamp, 2081 &sc->ppsparam.assert_offset, 2082 &sc->ppsinfo.assert_timestamp); 2083 } 2084 2085 #ifdef PPS_SYNC 2086 if (sc->ppsparam.mode & PPS_HARDPPSONASSERT) 2087 hardpps(&tv, tv.tv_usec); 2088 #endif 2089 sc->ppsinfo.assert_sequence++; 2090 sc->ppsinfo.current_mode = sc->ppsparam.mode; 2091 2092 } else if ((msr & sc->sc_ppsmask) == sc->sc_ppsclear) { 2093 /* XXX nanotime() */ 2094 microtime(&tv); 2095 TIMEVAL_TO_TIMESPEC(&tv, 2096 &sc->ppsinfo.clear_timestamp); 2097 if (sc->ppsparam.mode & PPS_OFFSETCLEAR) { 2098 timespecadd(&sc->ppsinfo.clear_timestamp, 2099 &sc->ppsparam.clear_offset, 2100 &sc->ppsinfo.clear_timestamp); 2101 } 2102 2103 #ifdef PPS_SYNC 2104 if (sc->ppsparam.mode & PPS_HARDPPSONCLEAR) 2105 hardpps(&tv, tv.tv_usec); 2106 #endif 2107 sc->ppsinfo.clear_sequence++; 2108 sc->ppsinfo.current_mode = sc->ppsparam.mode; 2109 } 2110 } 2111 2112 /* 2113 * Process normal status changes 2114 */ 2115 if (ISSET(delta, sc->sc_msr_mask)) { 2116 SET(sc->sc_msr_delta, delta); 2117 2118 /* 2119 * Stop output immediately if we lose the output 2120 * flow control signal or carrier detect. 2121 */ 2122 if (ISSET(~msr, sc->sc_msr_mask)) { 2123 sc->sc_tbc = 0; 2124 sc->sc_heldtbc = 0; 2125 #ifdef COM_DEBUG 2126 if (com_debug) 2127 comstatus(sc, "comintr "); 2128 #endif 2129 } 2130 2131 sc->sc_st_check = 1; 2132 } 2133 } while (ISSET((iir = bus_space_read_1(iot, ioh, com_iir)), IIR_RXRDY) 2134 || ((iir & IIR_IMASK) == 0)); 2135 2136 /* 2137 * Done handling any receive interrupts. See if data can be 2138 * transmitted as well. Schedule tx done event if no data left 2139 * and tty was marked busy. 2140 */ 2141 if (ISSET(lsr, LSR_TXRDY)) { 2142 /* 2143 * If we've delayed a parameter change, do it now, and restart 2144 * output. 2145 */ 2146 if (sc->sc_heldchange) { 2147 com_loadchannelregs(sc); 2148 sc->sc_heldchange = 0; 2149 sc->sc_tbc = sc->sc_heldtbc; 2150 sc->sc_heldtbc = 0; 2151 } 2152 2153 /* Output the next chunk of the contiguous buffer, if any. */ 2154 if (sc->sc_tbc > 0) { 2155 int n; 2156 2157 n = sc->sc_tbc; 2158 if (n > sc->sc_fifolen) 2159 n = sc->sc_fifolen; 2160 bus_space_write_multi_1(iot, ioh, com_data, sc->sc_tba, n); 2161 sc->sc_tbc -= n; 2162 sc->sc_tba += n; 2163 } else { 2164 /* Disable transmit completion interrupts if necessary. */ 2165 if (ISSET(sc->sc_ier, IER_ETXRDY)) { 2166 CLR(sc->sc_ier, IER_ETXRDY); 2167 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 2168 } 2169 if (sc->sc_tx_busy) { 2170 sc->sc_tx_busy = 0; 2171 sc->sc_tx_done = 1; 2172 } 2173 } 2174 } 2175 2176 if (!ISSET((iir = bus_space_read_1(iot, ioh, com_iir)), IIR_NOPEND)) 2177 goto again; 2178 2179 COM_UNLOCK(sc); 2180 2181 /* Wake up the poller. */ 2182 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 2183 softintr_schedule(sc->sc_si); 2184 #else 2185 #ifndef __NO_SOFT_SERIAL_INTERRUPT 2186 setsoftserial(); 2187 #else 2188 if (!com_softintr_scheduled) { 2189 com_softintr_scheduled = 1; 2190 callout_reset(&comsoft_callout, 1, comsoft, NULL); 2191 } 2192 #endif 2193 #endif 2194 2195 #if NRND > 0 && defined(RND_COM) 2196 rnd_add_uint32(&sc->rnd_source, iir | lsr); 2197 #endif 2198 2199 return (1); 2200 } 2201 2202 /* 2203 * The following functions are polled getc and putc routines, shared 2204 * by the console and kgdb glue. 2205 * 2206 * The read-ahead code is so that you can detect pending in-band 2207 * cn_magic in polled mode while doing output rather than having to 2208 * wait until the kernel decides it needs input. 2209 */ 2210 2211 #define MAX_READAHEAD 20 2212 static int com_readahead[MAX_READAHEAD]; 2213 static int com_readaheadcount = 0; 2214 2215 int 2216 com_common_getc(dev_t dev, bus_space_tag_t iot, bus_space_handle_t ioh) 2217 { 2218 int s = splserial(); 2219 u_char stat, c; 2220 2221 /* got a character from reading things earlier */ 2222 if (com_readaheadcount > 0) { 2223 int i; 2224 2225 c = com_readahead[0]; 2226 for (i = 1; i < com_readaheadcount; i++) { 2227 com_readahead[i-1] = com_readahead[i]; 2228 } 2229 com_readaheadcount--; 2230 splx(s); 2231 return (c); 2232 } 2233 2234 /* block until a character becomes available */ 2235 while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_RXRDY)) 2236 ; 2237 2238 c = bus_space_read_1(iot, ioh, com_data); 2239 stat = bus_space_read_1(iot, ioh, com_iir); 2240 { 2241 int cn_trapped = 0; /* unused */ 2242 #ifdef DDB 2243 extern int db_active; 2244 if (!db_active) 2245 #endif 2246 cn_check_magic(dev, c, com_cnm_state); 2247 } 2248 splx(s); 2249 return (c); 2250 } 2251 2252 void 2253 com_common_putc(dev_t dev, bus_space_tag_t iot, bus_space_handle_t ioh, int c) 2254 { 2255 int s = splserial(); 2256 int timo; 2257 2258 int cin, stat; 2259 if (com_readaheadcount < MAX_READAHEAD 2260 && ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_RXRDY)) { 2261 int cn_trapped = 0; 2262 cin = bus_space_read_1(iot, ioh, com_data); 2263 stat = bus_space_read_1(iot, ioh, com_iir); 2264 cn_check_magic(dev, cin, com_cnm_state); 2265 com_readahead[com_readaheadcount++] = cin; 2266 } 2267 2268 /* wait for any pending transmission to finish */ 2269 timo = 150000; 2270 while (!ISSET(bus_space_read_1(iot, ioh, com_lsr), LSR_TXRDY) && --timo) 2271 continue; 2272 2273 bus_space_write_1(iot, ioh, com_data, c); 2274 COM_BARRIER(iot, ioh, BR | BW); 2275 2276 /* wait for this transmission to complete */ 2277 timo = 1500000; 2278 while (!ISSET(bus_space_read_1(iot, ioh, com_lsr), LSR_TXRDY) && --timo) 2279 continue; 2280 2281 splx(s); 2282 } 2283 2284 /* 2285 * Initialize UART for use as console or KGDB line. 2286 */ 2287 int 2288 cominit(bus_space_tag_t iot, bus_addr_t iobase, int rate, int frequency, 2289 tcflag_t cflag, bus_space_handle_t *iohp) 2290 { 2291 bus_space_handle_t ioh; 2292 2293 if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) 2294 return (ENOMEM); /* ??? */ 2295 2296 bus_space_write_1(iot, ioh, com_lcr, LCR_EERS); 2297 bus_space_write_1(iot, ioh, com_efr, 0); 2298 bus_space_write_1(iot, ioh, com_lcr, LCR_DLAB); 2299 rate = comspeed(rate, frequency); 2300 bus_space_write_1(iot, ioh, com_dlbl, rate); 2301 bus_space_write_1(iot, ioh, com_dlbh, rate >> 8); 2302 bus_space_write_1(iot, ioh, com_lcr, cflag2lcr(cflag)); 2303 bus_space_write_1(iot, ioh, com_mcr, MCR_DTR | MCR_RTS); 2304 bus_space_write_1(iot, ioh, com_fifo, 2305 FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_1); 2306 bus_space_write_1(iot, ioh, com_ier, 0); 2307 2308 *iohp = ioh; 2309 return (0); 2310 } 2311 2312 /* 2313 * Following are all routines needed for COM to act as console 2314 */ 2315 struct consdev comcons = { 2316 NULL, NULL, comcngetc, comcnputc, comcnpollc, NULL, 2317 NODEV, CN_NORMAL 2318 }; 2319 2320 2321 int 2322 comcnattach(bus_space_tag_t iot, bus_addr_t iobase, int rate, int frequency, 2323 tcflag_t cflag) 2324 { 2325 int res; 2326 2327 res = cominit(iot, iobase, rate, frequency, cflag, &comconsioh); 2328 if (res) 2329 return (res); 2330 2331 cn_tab = &comcons; 2332 cn_init_magic(&com_cnm_state); 2333 cn_set_magic("\047\001"); /* default magic is BREAK */ 2334 2335 comconstag = iot; 2336 comconsaddr = iobase; 2337 comconsrate = rate; 2338 comconscflag = cflag; 2339 2340 return (0); 2341 } 2342 2343 int 2344 comcngetc(dev_t dev) 2345 { 2346 2347 return (com_common_getc(dev, comconstag, comconsioh)); 2348 } 2349 2350 /* 2351 * Console kernel output character routine. 2352 */ 2353 void 2354 comcnputc(dev_t dev, int c) 2355 { 2356 2357 com_common_putc(dev, comconstag, comconsioh, c); 2358 } 2359 2360 void 2361 comcnpollc(dev_t dev, int on) 2362 { 2363 2364 } 2365 2366 #ifdef KGDB 2367 int 2368 com_kgdb_attach(bus_space_tag_t iot, bus_addr_t iobase, int rate, 2369 int frequency, tcflag_t cflag) 2370 { 2371 int res; 2372 2373 if (iot == comconstag && iobase == comconsaddr) 2374 return (EBUSY); /* cannot share with console */ 2375 2376 res = cominit(iot, iobase, rate, frequency, cflag, &com_kgdb_ioh); 2377 if (res) 2378 return (res); 2379 2380 /* 2381 * XXXfvdl this shouldn't be needed, but the cn_magic goo 2382 * expects this to be initialized 2383 */ 2384 cn_init_magic(&com_cnm_state); 2385 cn_set_magic("\047\001"); 2386 2387 kgdb_attach(com_kgdb_getc, com_kgdb_putc, NULL); 2388 kgdb_dev = 123; /* unneeded, only to satisfy some tests */ 2389 2390 com_kgdb_iot = iot; 2391 com_kgdb_addr = iobase; 2392 2393 return (0); 2394 } 2395 2396 /* ARGSUSED */ 2397 int 2398 com_kgdb_getc(void *arg) 2399 { 2400 2401 return (com_common_getc(NODEV, com_kgdb_iot, com_kgdb_ioh)); 2402 } 2403 2404 /* ARGSUSED */ 2405 void 2406 com_kgdb_putc(void *arg, int c) 2407 { 2408 2409 com_common_putc(NODEV, com_kgdb_iot, com_kgdb_ioh, c); 2410 } 2411 #endif /* KGDB */ 2412 2413 /* helper function to identify the com ports used by 2414 console or KGDB (and not yet autoconf attached) */ 2415 int 2416 com_is_console(bus_space_tag_t iot, bus_addr_t iobase, bus_space_handle_t *ioh) 2417 { 2418 bus_space_handle_t help; 2419 2420 if (!comconsattached && 2421 iot == comconstag && iobase == comconsaddr) 2422 help = comconsioh; 2423 #ifdef KGDB 2424 else if (!com_kgdb_attached && 2425 iot == com_kgdb_iot && iobase == com_kgdb_addr) 2426 help = com_kgdb_ioh; 2427 #endif 2428 else 2429 return (0); 2430 2431 if (ioh) 2432 *ioh = help; 2433 return (1); 2434 } 2435
Indexes created Mon Sep 22 13:09:51 GMT 2025