com.c revision 1.170
1 /* $NetBSD: com.c,v 1.170 2000/03/23 07:01:29 thorpej 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 #include "opt_com.h" 81 82 #include "rnd.h" 83 #if NRND > 0 && defined(RND_COM) 84 #include <sys/rnd.h> 85 #endif 86 87 #include <sys/param.h> 88 #include <sys/systm.h> 89 #include <sys/ioctl.h> 90 #include <sys/select.h> 91 #include <sys/tty.h> 92 #include <sys/proc.h> 93 #include <sys/user.h> 94 #include <sys/conf.h> 95 #include <sys/file.h> 96 #include <sys/uio.h> 97 #include <sys/kernel.h> 98 #include <sys/syslog.h> 99 #include <sys/types.h> 100 #include <sys/device.h> 101 #include <sys/malloc.h> 102 #include <sys/timepps.h> 103 #include <sys/vnode.h> 104 105 #include <machine/intr.h> 106 #include <machine/bus.h> 107 108 #include <dev/ic/comreg.h> 109 #include <dev/ic/comvar.h> 110 #include <dev/ic/ns16550reg.h> 111 #include <dev/ic/st16650reg.h> 112 #ifdef COM_HAYESP 113 #include <dev/ic/hayespreg.h> 114 #endif 115 #define com_lcr com_cfcr 116 #include <dev/cons.h> 117 118 #include "com.h" 119 120 #ifdef COM_HAYESP 121 int comprobeHAYESP __P((bus_space_handle_t hayespioh, struct com_softc *sc)); 122 #endif 123 124 #if defined(DDB) || defined(KGDB) 125 static void com_enable_debugport __P((struct com_softc *)); 126 #endif 127 void com_attach_subr __P((struct com_softc *sc)); 128 void com_config __P((struct com_softc *)); 129 void com_shutdown __P((struct com_softc *)); 130 int comspeed __P((long, long)); 131 static u_char cflag2lcr __P((tcflag_t)); 132 int comparam __P((struct tty *, struct termios *)); 133 void comstart __P((struct tty *)); 134 void comstop __P((struct tty *, int)); 135 int comhwiflow __P((struct tty *, int)); 136 137 void com_loadchannelregs __P((struct com_softc *)); 138 void com_hwiflow __P((struct com_softc *)); 139 void com_break __P((struct com_softc *, int)); 140 void com_modem __P((struct com_softc *, int)); 141 void tiocm_to_com __P((struct com_softc *, int, int)); 142 int com_to_tiocm __P((struct com_softc *)); 143 void com_iflush __P((struct com_softc *)); 144 145 int com_common_getc __P((bus_space_tag_t, bus_space_handle_t)); 146 void com_common_putc __P((bus_space_tag_t, bus_space_handle_t, int)); 147 148 /* XXX: These belong elsewhere */ 149 cdev_decl(com); 150 bdev_decl(com); 151 152 int comcngetc __P((dev_t)); 153 void comcnputc __P((dev_t, int)); 154 void comcnpollc __P((dev_t, int)); 155 156 #define integrate static inline 157 #ifdef __GENERIC_SOFT_INTERRUPTS 158 void comsoft __P((void *)); 159 #else 160 #ifndef __NO_SOFT_SERIAL_INTERRUPT 161 void comsoft __P((void)); 162 #else 163 void comsoft __P((void *)); 164 struct callout comsoft_callout = CALLOUT_INITIALIZER; 165 #endif 166 #endif 167 integrate void com_rxsoft __P((struct com_softc *, struct tty *)); 168 integrate void com_txsoft __P((struct com_softc *, struct tty *)); 169 integrate void com_stsoft __P((struct com_softc *, struct tty *)); 170 integrate void com_schedrx __P((struct com_softc *)); 171 void comdiag __P((void *)); 172 173 extern struct cfdriver com_cd; 174 175 /* 176 * Make this an option variable one can patch. 177 * But be warned: this must be a power of 2! 178 */ 179 u_int com_rbuf_size = COM_RING_SIZE; 180 181 /* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */ 182 u_int com_rbuf_hiwat = (COM_RING_SIZE * 1) / 4; 183 u_int com_rbuf_lowat = (COM_RING_SIZE * 3) / 4; 184 185 static int comconsaddr; 186 static bus_space_tag_t comconstag; 187 static bus_space_handle_t comconsioh; 188 static int comconsattached; 189 static int comconsrate; 190 static tcflag_t comconscflag; 191 192 static int ppscap = 193 PPS_TSFMT_TSPEC | 194 PPS_CAPTUREASSERT | 195 PPS_CAPTURECLEAR | 196 #ifdef PPS_SYNC 197 PPS_HARDPPSONASSERT | PPS_HARDPPSONCLEAR | 198 #endif /* PPS_SYNC */ 199 PPS_OFFSETASSERT | PPS_OFFSETCLEAR; 200 201 #ifndef __GENERIC_SOFT_INTERRUPTS 202 #ifdef __NO_SOFT_SERIAL_INTERRUPT 203 volatile int com_softintr_scheduled; 204 #endif 205 #endif 206 207 #ifdef KGDB 208 #include <sys/kgdb.h> 209 210 static int com_kgdb_addr; 211 static bus_space_tag_t com_kgdb_iot; 212 static bus_space_handle_t com_kgdb_ioh; 213 static int com_kgdb_attached; 214 215 int com_kgdb_getc __P((void *)); 216 void com_kgdb_putc __P((void *, int)); 217 #endif /* KGDB */ 218 219 #define COMUNIT_MASK 0x7ffff 220 #define COMDIALOUT_MASK 0x80000 221 222 #define COMUNIT(x) (minor(x) & COMUNIT_MASK) 223 #define COMDIALOUT(x) (minor(x) & COMDIALOUT_MASK) 224 225 #define COM_ISALIVE(sc) ((sc)->enabled != 0 && \ 226 ISSET((sc)->sc_dev.dv_flags, DVF_ACTIVE)) 227 228 #define BR BUS_SPACE_BARRIER_READ 229 #define BW BUS_SPACE_BARRIER_WRITE 230 #define COM_BARRIER(t, h, f) bus_space_barrier((t), (h), 0, COM_NPORTS, (f)) 231 232 int 233 comspeed(speed, frequency) 234 long speed, frequency; 235 { 236 #define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */ 237 238 int x, err; 239 240 #if 0 241 if (speed == 0) 242 return (0); 243 #endif 244 if (speed <= 0) 245 return (-1); 246 x = divrnd(frequency / 16, speed); 247 if (x <= 0) 248 return (-1); 249 err = divrnd(((quad_t)frequency) * 1000 / 16, speed * x) - 1000; 250 if (err < 0) 251 err = -err; 252 if (err > COM_TOLERANCE) 253 return (-1); 254 return (x); 255 256 #undef divrnd(n, q) 257 } 258 259 #ifdef COM_DEBUG 260 int com_debug = 0; 261 262 void comstatus __P((struct com_softc *, char *)); 263 void 264 comstatus(sc, str) 265 struct com_softc *sc; 266 char *str; 267 { 268 struct tty *tp = sc->sc_tty; 269 270 printf("%s: %s %sclocal %sdcd %sts_carr_on %sdtr %stx_stopped\n", 271 sc->sc_dev.dv_xname, str, 272 ISSET(tp->t_cflag, CLOCAL) ? "+" : "-", 273 ISSET(sc->sc_msr, MSR_DCD) ? "+" : "-", 274 ISSET(tp->t_state, TS_CARR_ON) ? "+" : "-", 275 ISSET(sc->sc_mcr, MCR_DTR) ? "+" : "-", 276 sc->sc_tx_stopped ? "+" : "-"); 277 278 printf("%s: %s %scrtscts %scts %sts_ttstop %srts %xrx_flags\n", 279 sc->sc_dev.dv_xname, str, 280 ISSET(tp->t_cflag, CRTSCTS) ? "+" : "-", 281 ISSET(sc->sc_msr, MSR_CTS) ? "+" : "-", 282 ISSET(tp->t_state, TS_TTSTOP) ? "+" : "-", 283 ISSET(sc->sc_mcr, MCR_RTS) ? "+" : "-", 284 sc->sc_rx_flags); 285 } 286 #endif 287 288 int 289 comprobe1(iot, ioh) 290 bus_space_tag_t iot; 291 bus_space_handle_t ioh; 292 { 293 294 /* force access to id reg */ 295 bus_space_write_1(iot, ioh, com_lcr, LCR_8BITS); 296 bus_space_write_1(iot, ioh, com_iir, 0); 297 if ((bus_space_read_1(iot, ioh, com_lcr) != LCR_8BITS) || 298 (bus_space_read_1(iot, ioh, com_iir) & 0x38)) 299 return (0); 300 301 return (1); 302 } 303 304 #ifdef COM_HAYESP 305 int 306 comprobeHAYESP(hayespioh, sc) 307 bus_space_handle_t hayespioh; 308 struct com_softc *sc; 309 { 310 char val, dips; 311 int combaselist[] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8 }; 312 bus_space_tag_t iot = sc->sc_iot; 313 314 /* 315 * Hayes ESP cards have two iobases. One is for compatibility with 316 * 16550 serial chips, and at the same ISA PC base addresses. The 317 * other is for ESP-specific enhanced features, and lies at a 318 * different addressing range entirely (0x140, 0x180, 0x280, or 0x300). 319 */ 320 321 /* Test for ESP signature */ 322 if ((bus_space_read_1(iot, hayespioh, 0) & 0xf3) == 0) 323 return (0); 324 325 /* 326 * ESP is present at ESP enhanced base address; unknown com port 327 */ 328 329 /* Get the dip-switch configurations */ 330 bus_space_write_1(iot, hayespioh, HAYESP_CMD1, HAYESP_GETDIPS); 331 dips = bus_space_read_1(iot, hayespioh, HAYESP_STATUS1); 332 333 /* Determine which com port this ESP card services: bits 0,1 of */ 334 /* dips is the port # (0-3); combaselist[val] is the com_iobase */ 335 if (sc->sc_iobase != combaselist[dips & 0x03]) 336 return (0); 337 338 printf(": ESP"); 339 340 /* Check ESP Self Test bits. */ 341 /* Check for ESP version 2.0: bits 4,5,6 == 010 */ 342 bus_space_write_1(iot, hayespioh, HAYESP_CMD1, HAYESP_GETTEST); 343 val = bus_space_read_1(iot, hayespioh, HAYESP_STATUS1); /* Clear reg1 */ 344 val = bus_space_read_1(iot, hayespioh, HAYESP_STATUS2); 345 if ((val & 0x70) < 0x20) { 346 printf("-old (%o)", val & 0x70); 347 /* we do not support the necessary features */ 348 return (0); 349 } 350 351 /* Check for ability to emulate 16550: bit 8 == 1 */ 352 if ((dips & 0x80) == 0) { 353 printf(" slave"); 354 /* XXX Does slave really mean no 16550 support?? */ 355 return (0); 356 } 357 358 /* 359 * If we made it this far, we are a full-featured ESP v2.0 (or 360 * better), at the correct com port address. 361 */ 362 363 SET(sc->sc_hwflags, COM_HW_HAYESP); 364 printf(", 1024 byte fifo\n"); 365 return (1); 366 } 367 #endif 368 369 #if defined(DDB) || defined(KGDB) 370 static void 371 com_enable_debugport(sc) 372 struct com_softc *sc; 373 { 374 int s; 375 376 /* Turn on line break interrupt, set carrier. */ 377 s = splserial(); 378 sc->sc_ier = IER_ERXRDY; 379 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 380 SET(sc->sc_mcr, MCR_DTR | MCR_RTS); 381 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_mcr, sc->sc_mcr); 382 splx(s); 383 } 384 #endif 385 386 void 387 com_attach_subr(sc) 388 struct com_softc *sc; 389 { 390 int iobase = sc->sc_iobase; 391 bus_space_tag_t iot = sc->sc_iot; 392 bus_space_handle_t ioh = sc->sc_ioh; 393 struct tty *tp; 394 #ifdef COM16650 395 u_int8_t lcr; 396 #endif 397 #ifdef COM_HAYESP 398 int hayesp_ports[] = { 0x140, 0x180, 0x280, 0x300, 0 }; 399 int *hayespp; 400 #endif 401 402 callout_init(&sc->sc_diag_callout); 403 404 /* Disable interrupts before configuring the device. */ 405 sc->sc_ier = 0; 406 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 407 408 if (iot == comconstag && iobase == comconsaddr) { 409 comconsattached = 1; 410 411 /* Make sure the console is always "hardwired". */ 412 delay(1000); /* wait for output to finish */ 413 SET(sc->sc_hwflags, COM_HW_CONSOLE); 414 SET(sc->sc_swflags, TIOCFLAG_SOFTCAR); 415 } 416 417 #ifdef COM_HAYESP 418 /* Look for a Hayes ESP board. */ 419 for (hayespp = hayesp_ports; *hayespp != 0; hayespp++) { 420 bus_space_handle_t hayespioh; 421 422 #define HAYESP_NPORTS 8 /* XXX XXX XXX ??? ??? ??? */ 423 if (bus_space_map(iot, *hayespp, HAYESP_NPORTS, 0, &hayespioh)) 424 continue; 425 if (comprobeHAYESP(hayespioh, sc)) { 426 sc->sc_hayespioh = hayespioh; 427 sc->sc_fifolen = 1024; 428 429 break; 430 } 431 bus_space_unmap(iot, hayespioh, HAYESP_NPORTS); 432 } 433 /* No ESP; look for other things. */ 434 if (!ISSET(sc->sc_hwflags, COM_HW_HAYESP)) { 435 #endif 436 sc->sc_fifolen = 1; 437 /* look for a NS 16550AF UART with FIFOs */ 438 bus_space_write_1(iot, ioh, com_fifo, 439 FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_14); 440 delay(100); 441 if (ISSET(bus_space_read_1(iot, ioh, com_iir), IIR_FIFO_MASK) 442 == IIR_FIFO_MASK) 443 if (ISSET(bus_space_read_1(iot, ioh, com_fifo), FIFO_TRIGGER_14) 444 == FIFO_TRIGGER_14) { 445 SET(sc->sc_hwflags, COM_HW_FIFO); 446 447 #ifdef COM16650 448 /* 449 * IIR changes into the EFR if LCR is set to LCR_EERS 450 * on 16650s. We also know IIR != 0 at this point. 451 * Write 0 into the EFR, and read it. If the result 452 * is 0, we have a 16650. 453 * 454 * Older 16650s were broken; the test to detect them 455 * is taken from the Linux driver. Apparently 456 * setting DLAB enable gives access to the EFR on 457 * these chips. 458 */ 459 lcr = bus_space_read_1(iot, ioh, com_lcr); 460 bus_space_write_1(iot, ioh, com_lcr, LCR_EERS); 461 bus_space_write_1(iot, ioh, com_efr, 0); 462 if (bus_space_read_1(iot, ioh, com_efr) == 0) { 463 bus_space_write_1(iot, ioh, com_lcr, 464 lcr | LCR_DLAB); 465 if (bus_space_read_1(iot, ioh, com_efr) == 0) { 466 CLR(sc->sc_hwflags, COM_HW_FIFO); 467 sc->sc_fifolen = 0; 468 } else { 469 SET(sc->sc_hwflags, COM_HW_FLOW); 470 sc->sc_fifolen = 32; 471 } 472 } else 473 #endif 474 sc->sc_fifolen = 16; 475 476 #ifdef COM16650 477 bus_space_write_1(iot, ioh, com_lcr, lcr); 478 if (sc->sc_fifolen == 0) 479 printf(": st16650, broken fifo\n"); 480 else if (sc->sc_fifolen == 32) 481 printf(": st16650a, working fifo\n"); 482 else 483 #endif 484 printf(": ns16550a, working fifo\n"); 485 } else 486 printf(": ns16550, broken fifo\n"); 487 else 488 printf(": ns8250 or ns16450, no fifo\n"); 489 bus_space_write_1(iot, ioh, com_fifo, 0); 490 if (ISSET(sc->sc_hwflags, COM_HW_TXFIFO_DISABLE)) { 491 sc->sc_fifolen = 1; 492 printf("%s: txfifo disabled\n", sc->sc_dev.dv_xname); 493 } 494 #ifdef COM_HAYESP 495 } 496 #endif 497 498 tp = ttymalloc(); 499 tp->t_oproc = comstart; 500 tp->t_param = comparam; 501 tp->t_hwiflow = comhwiflow; 502 503 sc->sc_tty = tp; 504 sc->sc_rbuf = malloc(com_rbuf_size << 1, M_DEVBUF, M_NOWAIT); 505 if (sc->sc_rbuf == NULL) { 506 printf("%s: unable to allocate ring buffer\n", 507 sc->sc_dev.dv_xname); 508 return; 509 } 510 sc->sc_ebuf = sc->sc_rbuf + (com_rbuf_size << 1); 511 512 tty_attach(tp); 513 514 if (!ISSET(sc->sc_hwflags, COM_HW_NOIEN)) 515 SET(sc->sc_mcr, MCR_IENABLE); 516 517 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 518 int maj; 519 520 /* locate the major number */ 521 for (maj = 0; maj < nchrdev; maj++) 522 if (cdevsw[maj].d_open == comopen) 523 break; 524 525 cn_tab->cn_dev = makedev(maj, sc->sc_dev.dv_unit); 526 527 printf("%s: console\n", sc->sc_dev.dv_xname); 528 } 529 530 #ifdef KGDB 531 /* 532 * Allow kgdb to "take over" this port. If this is 533 * the kgdb device, it has exclusive use. 534 */ 535 if (iot == com_kgdb_iot && iobase == com_kgdb_addr) { 536 com_kgdb_attached = 1; 537 538 SET(sc->sc_hwflags, COM_HW_KGDB); 539 printf("%s: kgdb\n", sc->sc_dev.dv_xname); 540 } 541 #endif 542 543 #ifdef __GENERIC_SOFT_INTERRUPTS 544 sc->sc_si = softintr_establish(IPL_SOFTSERIAL, comsoft, sc); 545 #endif 546 547 #if NRND > 0 && defined(RND_COM) 548 rnd_attach_source(&sc->rnd_source, sc->sc_dev.dv_xname, 549 RND_TYPE_TTY, 0); 550 #endif 551 552 /* if there are no enable/disable functions, assume the device 553 is always enabled */ 554 if (!sc->enable) 555 sc->enabled = 1; 556 557 com_config(sc); 558 559 SET(sc->sc_hwflags, COM_HW_DEV_OK); 560 } 561 562 void 563 com_config(sc) 564 struct com_softc *sc; 565 { 566 bus_space_tag_t iot = sc->sc_iot; 567 bus_space_handle_t ioh = sc->sc_ioh; 568 569 /* Disable interrupts before configuring the device. */ 570 sc->sc_ier = 0; 571 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 572 573 #ifdef COM_HAYESP 574 /* Look for a Hayes ESP board. */ 575 if (ISSET(sc->sc_hwflags, COM_HW_HAYESP)) { 576 sc->sc_fifolen = 1024; 577 578 /* Set 16550 compatibility mode */ 579 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD1, 580 HAYESP_SETMODE); 581 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 582 HAYESP_MODE_FIFO|HAYESP_MODE_RTS| 583 HAYESP_MODE_SCALE); 584 585 /* Set RTS/CTS flow control */ 586 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD1, 587 HAYESP_SETFLOWTYPE); 588 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 589 HAYESP_FLOW_RTS); 590 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 591 HAYESP_FLOW_CTS); 592 593 /* Set flow control levels */ 594 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD1, 595 HAYESP_SETRXFLOW); 596 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 597 HAYESP_HIBYTE(HAYESP_RXHIWMARK)); 598 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 599 HAYESP_LOBYTE(HAYESP_RXHIWMARK)); 600 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 601 HAYESP_HIBYTE(HAYESP_RXLOWMARK)); 602 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 603 HAYESP_LOBYTE(HAYESP_RXLOWMARK)); 604 } 605 #endif 606 607 #ifdef DDB 608 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) 609 com_enable_debugport(sc); 610 #endif 611 612 #ifdef KGDB 613 /* 614 * Allow kgdb to "take over" this port. If this is 615 * the kgdb device, it has exclusive use. 616 */ 617 if (ISSET(sc->sc_hwflags, COM_HW_KGDB)) 618 com_enable_debugport(sc); 619 #endif 620 } 621 622 int 623 com_detach(self, flags) 624 struct device *self; 625 int flags; 626 { 627 struct com_softc *sc = (struct com_softc *)self; 628 int maj, mn; 629 630 /* locate the major number */ 631 for (maj = 0; maj < nchrdev; maj++) 632 if (cdevsw[maj].d_open == comopen) 633 break; 634 635 /* Nuke the vnodes for any open instances. */ 636 mn = self->dv_unit; 637 vdevgone(maj, mn, mn, VCHR); 638 639 mn |= COMDIALOUT_MASK; 640 vdevgone(maj, mn, mn, VCHR); 641 642 /* Free the receive buffer. */ 643 free(sc->sc_rbuf, M_DEVBUF); 644 645 /* Detach and free the tty. */ 646 tty_detach(sc->sc_tty); 647 ttyfree(sc->sc_tty); 648 649 #ifdef __GENERIC_SOFT_INTERRUPTS 650 /* Unhook the soft interrupt handler. */ 651 softintr_disestablish(sc->sc_si); 652 #endif 653 654 #if NRND > 0 && defined(RND_COM) 655 /* Unhook the entropy source. */ 656 rnd_detach_source(&sc->rnd_source); 657 #endif 658 659 return (0); 660 } 661 662 int 663 com_activate(self, act) 664 struct device *self; 665 enum devact act; 666 { 667 struct com_softc *sc = (struct com_softc *)self; 668 int s, rv = 0; 669 670 s = splserial(); 671 switch (act) { 672 case DVACT_ACTIVATE: 673 rv = EOPNOTSUPP; 674 break; 675 676 case DVACT_DEACTIVATE: 677 if (sc->sc_hwflags & (COM_HW_CONSOLE|COM_HW_KGDB)) { 678 rv = EBUSY; 679 break; 680 } 681 682 if (sc->disable != NULL && sc->enabled != 0) { 683 (*sc->disable)(sc); 684 sc->enabled = 0; 685 } 686 break; 687 } 688 splx(s); 689 return (rv); 690 } 691 692 void 693 com_shutdown(sc) 694 struct com_softc *sc; 695 { 696 struct tty *tp = sc->sc_tty; 697 int s; 698 699 s = splserial(); 700 701 /* If we were asserting flow control, then deassert it. */ 702 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 703 com_hwiflow(sc); 704 705 /* Clear any break condition set with TIOCSBRK. */ 706 com_break(sc, 0); 707 708 /* Turn off PPS capture on last close. */ 709 sc->sc_ppsmask = 0; 710 sc->ppsparam.mode = 0; 711 712 /* 713 * Hang up if necessary. Wait a bit, so the other side has time to 714 * notice even if we immediately open the port again. 715 */ 716 if (ISSET(tp->t_cflag, HUPCL)) { 717 com_modem(sc, 0); 718 (void) tsleep(sc, TTIPRI, ttclos, hz); 719 } 720 721 /* Turn off interrupts. */ 722 #ifdef DDB 723 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) 724 sc->sc_ier = IER_ERXRDY; /* interrupt on break */ 725 else 726 #endif 727 sc->sc_ier = 0; 728 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 729 730 if (sc->disable) { 731 #ifdef DIAGNOSTIC 732 if (!sc->enabled) 733 panic("com_shutdown: not enabled?"); 734 #endif 735 (*sc->disable)(sc); 736 sc->enabled = 0; 737 } 738 739 splx(s); 740 } 741 742 int 743 comopen(dev, flag, mode, p) 744 dev_t dev; 745 int flag, mode; 746 struct proc *p; 747 { 748 int unit = COMUNIT(dev); 749 struct com_softc *sc; 750 struct tty *tp; 751 int s, s2; 752 int error; 753 754 if (unit >= com_cd.cd_ndevs) 755 return (ENXIO); 756 sc = com_cd.cd_devs[unit]; 757 if (sc == 0 || !ISSET(sc->sc_hwflags, COM_HW_DEV_OK) || 758 sc->sc_rbuf == NULL) 759 return (ENXIO); 760 761 if (ISSET(sc->sc_dev.dv_flags, DVF_ACTIVE) == 0) 762 return (ENXIO); 763 764 #ifdef KGDB 765 /* 766 * If this is the kgdb port, no other use is permitted. 767 */ 768 if (ISSET(sc->sc_hwflags, COM_HW_KGDB)) 769 return (EBUSY); 770 #endif 771 772 tp = sc->sc_tty; 773 774 if (ISSET(tp->t_state, TS_ISOPEN) && 775 ISSET(tp->t_state, TS_XCLUDE) && 776 p->p_ucred->cr_uid != 0) 777 return (EBUSY); 778 779 s = spltty(); 780 781 /* 782 * Do the following iff this is a first open. 783 */ 784 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 785 struct termios t; 786 787 tp->t_dev = dev; 788 789 s2 = splserial(); 790 791 if (sc->enable) { 792 if ((*sc->enable)(sc)) { 793 splx(s2); 794 splx(s); 795 printf("%s: device enable failed\n", 796 sc->sc_dev.dv_xname); 797 return (EIO); 798 } 799 sc->enabled = 1; 800 com_config(sc); 801 } 802 803 /* Turn on interrupts. */ 804 sc->sc_ier = IER_ERXRDY | IER_ERLS | IER_EMSC; 805 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 806 807 /* Fetch the current modem control status, needed later. */ 808 sc->sc_msr = bus_space_read_1(sc->sc_iot, sc->sc_ioh, com_msr); 809 810 /* Clear PPS capture state on first open. */ 811 sc->sc_ppsmask = 0; 812 sc->ppsparam.mode = 0; 813 814 splx(s2); 815 816 /* 817 * Initialize the termios status to the defaults. Add in the 818 * sticky bits from TIOCSFLAGS. 819 */ 820 t.c_ispeed = 0; 821 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 822 t.c_ospeed = comconsrate; 823 t.c_cflag = comconscflag; 824 } else { 825 t.c_ospeed = TTYDEF_SPEED; 826 t.c_cflag = TTYDEF_CFLAG; 827 } 828 if (ISSET(sc->sc_swflags, TIOCFLAG_CLOCAL)) 829 SET(t.c_cflag, CLOCAL); 830 if (ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS)) 831 SET(t.c_cflag, CRTSCTS); 832 if (ISSET(sc->sc_swflags, TIOCFLAG_MDMBUF)) 833 SET(t.c_cflag, MDMBUF); 834 /* Make sure comparam() will do something. */ 835 tp->t_ospeed = 0; 836 (void) comparam(tp, &t); 837 tp->t_iflag = TTYDEF_IFLAG; 838 tp->t_oflag = TTYDEF_OFLAG; 839 tp->t_lflag = TTYDEF_LFLAG; 840 ttychars(tp); 841 ttsetwater(tp); 842 843 s2 = splserial(); 844 845 /* 846 * Turn on DTR. We must always do this, even if carrier is not 847 * present, because otherwise we'd have to use TIOCSDTR 848 * immediately after setting CLOCAL, which applications do not 849 * expect. We always assert DTR while the device is open 850 * unless explicitly requested to deassert it. 851 */ 852 com_modem(sc, 1); 853 854 /* Clear the input ring, and unblock. */ 855 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 856 sc->sc_rbavail = com_rbuf_size; 857 com_iflush(sc); 858 CLR(sc->sc_rx_flags, RX_ANY_BLOCK); 859 com_hwiflow(sc); 860 861 #ifdef COM_DEBUG 862 if (com_debug) 863 comstatus(sc, "comopen "); 864 #endif 865 866 splx(s2); 867 } 868 869 splx(s); 870 871 error = ttyopen(tp, COMDIALOUT(dev), ISSET(flag, O_NONBLOCK)); 872 if (error) 873 goto bad; 874 875 error = (*linesw[tp->t_line].l_open)(dev, tp); 876 if (error) 877 goto bad; 878 879 return (0); 880 881 bad: 882 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 883 /* 884 * We failed to open the device, and nobody else had it opened. 885 * Clean up the state as appropriate. 886 */ 887 com_shutdown(sc); 888 } 889 890 return (error); 891 } 892 893 int 894 comclose(dev, flag, mode, p) 895 dev_t dev; 896 int flag, mode; 897 struct proc *p; 898 { 899 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 900 struct tty *tp = sc->sc_tty; 901 902 /* XXX This is for cons.c. */ 903 if (!ISSET(tp->t_state, TS_ISOPEN)) 904 return (0); 905 906 (*linesw[tp->t_line].l_close)(tp, flag); 907 ttyclose(tp); 908 909 if (COM_ISALIVE(sc) == 0) 910 return (0); 911 912 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 913 /* 914 * Although we got a last close, the device may still be in 915 * use; e.g. if this was the dialout node, and there are still 916 * processes waiting for carrier on the non-dialout node. 917 */ 918 com_shutdown(sc); 919 } 920 921 return (0); 922 } 923 924 int 925 comread(dev, uio, flag) 926 dev_t dev; 927 struct uio *uio; 928 int flag; 929 { 930 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 931 struct tty *tp = sc->sc_tty; 932 933 if (COM_ISALIVE(sc) == 0) 934 return (EIO); 935 936 return ((*linesw[tp->t_line].l_read)(tp, uio, flag)); 937 } 938 939 int 940 comwrite(dev, uio, flag) 941 dev_t dev; 942 struct uio *uio; 943 int flag; 944 { 945 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 946 struct tty *tp = sc->sc_tty; 947 948 if (COM_ISALIVE(sc) == 0) 949 return (EIO); 950 951 return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 952 } 953 954 struct tty * 955 comtty(dev) 956 dev_t dev; 957 { 958 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 959 struct tty *tp = sc->sc_tty; 960 961 return (tp); 962 } 963 964 int 965 comioctl(dev, cmd, data, flag, p) 966 dev_t dev; 967 u_long cmd; 968 caddr_t data; 969 int flag; 970 struct proc *p; 971 { 972 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 973 struct tty *tp = sc->sc_tty; 974 int error; 975 int s; 976 977 if (COM_ISALIVE(sc) == 0) 978 return (EIO); 979 980 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); 981 if (error >= 0) 982 return (error); 983 984 error = ttioctl(tp, cmd, data, flag, p); 985 if (error >= 0) 986 return (error); 987 988 error = 0; 989 990 s = splserial(); 991 992 switch (cmd) { 993 case TIOCSBRK: 994 com_break(sc, 1); 995 break; 996 997 case TIOCCBRK: 998 com_break(sc, 0); 999 break; 1000 1001 case TIOCSDTR: 1002 com_modem(sc, 1); 1003 break; 1004 1005 case TIOCCDTR: 1006 com_modem(sc, 0); 1007 break; 1008 1009 case TIOCGFLAGS: 1010 *(int *)data = sc->sc_swflags; 1011 break; 1012 1013 case TIOCSFLAGS: 1014 error = suser(p->p_ucred, &p->p_acflag); 1015 if (error) 1016 break; 1017 sc->sc_swflags = *(int *)data; 1018 break; 1019 1020 case TIOCMSET: 1021 case TIOCMBIS: 1022 case TIOCMBIC: 1023 tiocm_to_com(sc, cmd, *(int *)data); 1024 break; 1025 1026 case TIOCMGET: 1027 *(int *)data = com_to_tiocm(sc); 1028 break; 1029 1030 case PPS_IOC_CREATE: 1031 break; 1032 1033 case PPS_IOC_DESTROY: 1034 break; 1035 1036 case PPS_IOC_GETPARAMS: { 1037 pps_params_t *pp; 1038 pp = (pps_params_t *)data; 1039 *pp = sc->ppsparam; 1040 break; 1041 } 1042 1043 case PPS_IOC_SETPARAMS: { 1044 pps_params_t *pp; 1045 int mode; 1046 pp = (pps_params_t *)data; 1047 if (pp->mode & ~ppscap) { 1048 error = EINVAL; 1049 break; 1050 } 1051 sc->ppsparam = *pp; 1052 /* 1053 * Compute msr masks from user-specified timestamp state. 1054 */ 1055 mode = sc->ppsparam.mode; 1056 #ifdef PPS_SYNC 1057 if (mode & PPS_HARDPPSONASSERT) { 1058 mode |= PPS_CAPTUREASSERT; 1059 /* XXX revoke any previous HARDPPS source */ 1060 } 1061 if (mode & PPS_HARDPPSONCLEAR) { 1062 mode |= PPS_CAPTURECLEAR; 1063 /* XXX revoke any previous HARDPPS source */ 1064 } 1065 #endif /* PPS_SYNC */ 1066 switch (mode & PPS_CAPTUREBOTH) { 1067 case 0: 1068 sc->sc_ppsmask = 0; 1069 break; 1070 1071 case PPS_CAPTUREASSERT: 1072 sc->sc_ppsmask = MSR_DCD; 1073 sc->sc_ppsassert = MSR_DCD; 1074 sc->sc_ppsclear = -1; 1075 break; 1076 1077 case PPS_CAPTURECLEAR: 1078 sc->sc_ppsmask = MSR_DCD; 1079 sc->sc_ppsassert = -1; 1080 sc->sc_ppsclear = 0; 1081 break; 1082 1083 case PPS_CAPTUREBOTH: 1084 sc->sc_ppsmask = MSR_DCD; 1085 sc->sc_ppsassert = MSR_DCD; 1086 sc->sc_ppsclear = 0; 1087 break; 1088 1089 default: 1090 error = EINVAL; 1091 break; 1092 } 1093 break; 1094 } 1095 1096 case PPS_IOC_GETCAP: 1097 *(int*)data = ppscap; 1098 break; 1099 1100 case PPS_IOC_FETCH: { 1101 pps_info_t *pi; 1102 pi = (pps_info_t *)data; 1103 *pi = sc->ppsinfo; 1104 break; 1105 } 1106 1107 case TIOCDCDTIMESTAMP: /* XXX old, overloaded API used by xntpd v3 */ 1108 /* 1109 * Some GPS clocks models use the falling rather than 1110 * rising edge as the on-the-second signal. 1111 * The old API has no way to specify PPS polarity. 1112 */ 1113 sc->sc_ppsmask = MSR_DCD; 1114 #ifndef PPS_TRAILING_EDGE 1115 sc->sc_ppsassert = MSR_DCD; 1116 sc->sc_ppsclear = -1; 1117 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 1118 &sc->ppsinfo.assert_timestamp); 1119 #else 1120 sc->sc_ppsassert = -1 1121 sc->sc_ppsclear = 0; 1122 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 1123 &sc->ppsinfo.clear_timestamp); 1124 #endif 1125 break; 1126 1127 default: 1128 error = ENOTTY; 1129 break; 1130 } 1131 1132 splx(s); 1133 1134 #ifdef COM_DEBUG 1135 if (com_debug) 1136 comstatus(sc, "comioctl "); 1137 #endif 1138 1139 return (error); 1140 } 1141 1142 integrate void 1143 com_schedrx(sc) 1144 struct com_softc *sc; 1145 { 1146 1147 sc->sc_rx_ready = 1; 1148 1149 /* Wake up the poller. */ 1150 #ifdef __GENERIC_SOFT_INTERRUPTS 1151 softintr_schedule(sc->sc_si); 1152 #else 1153 #ifndef __NO_SOFT_SERIAL_INTERRUPT 1154 setsoftserial(); 1155 #else 1156 if (!com_softintr_scheduled) { 1157 com_softintr_scheduled = 1; 1158 callout_reset(&comsoft_callout, 1, comsoft, NULL); 1159 } 1160 #endif 1161 #endif 1162 } 1163 1164 void 1165 com_break(sc, onoff) 1166 struct com_softc *sc; 1167 int onoff; 1168 { 1169 1170 if (onoff) 1171 SET(sc->sc_lcr, LCR_SBREAK); 1172 else 1173 CLR(sc->sc_lcr, LCR_SBREAK); 1174 1175 if (!sc->sc_heldchange) { 1176 if (sc->sc_tx_busy) { 1177 sc->sc_heldtbc = sc->sc_tbc; 1178 sc->sc_tbc = 0; 1179 sc->sc_heldchange = 1; 1180 } else 1181 com_loadchannelregs(sc); 1182 } 1183 } 1184 1185 void 1186 com_modem(sc, onoff) 1187 struct com_softc *sc; 1188 int onoff; 1189 { 1190 1191 if (sc->sc_mcr_dtr == 0) 1192 return; 1193 1194 if (onoff) 1195 SET(sc->sc_mcr, sc->sc_mcr_dtr); 1196 else 1197 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 1198 1199 if (!sc->sc_heldchange) { 1200 if (sc->sc_tx_busy) { 1201 sc->sc_heldtbc = sc->sc_tbc; 1202 sc->sc_tbc = 0; 1203 sc->sc_heldchange = 1; 1204 } else 1205 com_loadchannelregs(sc); 1206 } 1207 } 1208 1209 void 1210 tiocm_to_com(sc, how, ttybits) 1211 struct com_softc *sc; 1212 int how, ttybits; 1213 { 1214 u_char combits; 1215 1216 combits = 0; 1217 if (ISSET(ttybits, TIOCM_DTR)) 1218 SET(combits, MCR_DTR); 1219 if (ISSET(ttybits, TIOCM_RTS)) 1220 SET(combits, MCR_RTS); 1221 1222 switch (how) { 1223 case TIOCMBIC: 1224 CLR(sc->sc_mcr, combits); 1225 break; 1226 1227 case TIOCMBIS: 1228 SET(sc->sc_mcr, combits); 1229 break; 1230 1231 case TIOCMSET: 1232 CLR(sc->sc_mcr, MCR_DTR | MCR_RTS); 1233 SET(sc->sc_mcr, combits); 1234 break; 1235 } 1236 1237 if (!sc->sc_heldchange) { 1238 if (sc->sc_tx_busy) { 1239 sc->sc_heldtbc = sc->sc_tbc; 1240 sc->sc_tbc = 0; 1241 sc->sc_heldchange = 1; 1242 } else 1243 com_loadchannelregs(sc); 1244 } 1245 } 1246 1247 int 1248 com_to_tiocm(sc) 1249 struct com_softc *sc; 1250 { 1251 u_char combits; 1252 int ttybits = 0; 1253 1254 combits = sc->sc_mcr; 1255 if (ISSET(combits, MCR_DTR)) 1256 SET(ttybits, TIOCM_DTR); 1257 if (ISSET(combits, MCR_RTS)) 1258 SET(ttybits, TIOCM_RTS); 1259 1260 combits = sc->sc_msr; 1261 if (ISSET(combits, MSR_DCD)) 1262 SET(ttybits, TIOCM_CD); 1263 if (ISSET(combits, MSR_CTS)) 1264 SET(ttybits, TIOCM_CTS); 1265 if (ISSET(combits, MSR_DSR)) 1266 SET(ttybits, TIOCM_DSR); 1267 if (ISSET(combits, MSR_RI | MSR_TERI)) 1268 SET(ttybits, TIOCM_RI); 1269 1270 if (sc->sc_ier != 0) 1271 SET(ttybits, TIOCM_LE); 1272 1273 return (ttybits); 1274 } 1275 1276 static u_char 1277 cflag2lcr(cflag) 1278 tcflag_t cflag; 1279 { 1280 u_char lcr = 0; 1281 1282 switch (ISSET(cflag, CSIZE)) { 1283 case CS5: 1284 SET(lcr, LCR_5BITS); 1285 break; 1286 case CS6: 1287 SET(lcr, LCR_6BITS); 1288 break; 1289 case CS7: 1290 SET(lcr, LCR_7BITS); 1291 break; 1292 case CS8: 1293 SET(lcr, LCR_8BITS); 1294 break; 1295 } 1296 if (ISSET(cflag, PARENB)) { 1297 SET(lcr, LCR_PENAB); 1298 if (!ISSET(cflag, PARODD)) 1299 SET(lcr, LCR_PEVEN); 1300 } 1301 if (ISSET(cflag, CSTOPB)) 1302 SET(lcr, LCR_STOPB); 1303 1304 return (lcr); 1305 } 1306 1307 int 1308 comparam(tp, t) 1309 struct tty *tp; 1310 struct termios *t; 1311 { 1312 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1313 int ospeed = comspeed(t->c_ospeed, sc->sc_frequency); 1314 u_char lcr; 1315 int s; 1316 1317 if (COM_ISALIVE(sc) == 0) 1318 return (EIO); 1319 1320 /* Check requested parameters. */ 1321 if (ospeed < 0) 1322 return (EINVAL); 1323 if (t->c_ispeed && t->c_ispeed != t->c_ospeed) 1324 return (EINVAL); 1325 1326 /* 1327 * For the console, always force CLOCAL and !HUPCL, so that the port 1328 * is always active. 1329 */ 1330 if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) || 1331 ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 1332 SET(t->c_cflag, CLOCAL); 1333 CLR(t->c_cflag, HUPCL); 1334 } 1335 1336 /* 1337 * If there were no changes, don't do anything. This avoids dropping 1338 * input and improves performance when all we did was frob things like 1339 * VMIN and VTIME. 1340 */ 1341 if (tp->t_ospeed == t->c_ospeed && 1342 tp->t_cflag == t->c_cflag) 1343 return (0); 1344 1345 lcr = ISSET(sc->sc_lcr, LCR_SBREAK) | cflag2lcr(t->c_cflag); 1346 1347 s = splserial(); 1348 1349 sc->sc_lcr = lcr; 1350 1351 /* 1352 * If we're not in a mode that assumes a connection is present, then 1353 * ignore carrier changes. 1354 */ 1355 if (ISSET(t->c_cflag, CLOCAL | MDMBUF)) 1356 sc->sc_msr_dcd = 0; 1357 else 1358 sc->sc_msr_dcd = MSR_DCD; 1359 /* 1360 * Set the flow control pins depending on the current flow control 1361 * mode. 1362 */ 1363 if (ISSET(t->c_cflag, CRTSCTS)) { 1364 sc->sc_mcr_dtr = MCR_DTR; 1365 sc->sc_mcr_rts = MCR_RTS; 1366 sc->sc_msr_cts = MSR_CTS; 1367 sc->sc_efr = EFR_AUTORTS | EFR_AUTOCTS; 1368 } else if (ISSET(t->c_cflag, MDMBUF)) { 1369 /* 1370 * For DTR/DCD flow control, make sure we don't toggle DTR for 1371 * carrier detection. 1372 */ 1373 sc->sc_mcr_dtr = 0; 1374 sc->sc_mcr_rts = MCR_DTR; 1375 sc->sc_msr_cts = MSR_DCD; 1376 sc->sc_efr = 0; 1377 } else { 1378 /* 1379 * If no flow control, then always set RTS. This will make 1380 * the other side happy if it mistakenly thinks we're doing 1381 * RTS/CTS flow control. 1382 */ 1383 sc->sc_mcr_dtr = MCR_DTR | MCR_RTS; 1384 sc->sc_mcr_rts = 0; 1385 sc->sc_msr_cts = 0; 1386 sc->sc_efr = 0; 1387 if (ISSET(sc->sc_mcr, MCR_DTR)) 1388 SET(sc->sc_mcr, MCR_RTS); 1389 else 1390 CLR(sc->sc_mcr, MCR_RTS); 1391 } 1392 sc->sc_msr_mask = sc->sc_msr_cts | sc->sc_msr_dcd; 1393 1394 #if 0 1395 if (ospeed == 0) 1396 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 1397 else 1398 SET(sc->sc_mcr, sc->sc_mcr_dtr); 1399 #endif 1400 1401 sc->sc_dlbl = ospeed; 1402 sc->sc_dlbh = ospeed >> 8; 1403 1404 /* 1405 * Set the FIFO threshold based on the receive speed. 1406 * 1407 * * If it's a low speed, it's probably a mouse or some other 1408 * interactive device, so set the threshold low. 1409 * * If it's a high speed, trim the trigger level down to prevent 1410 * overflows. 1411 * * Otherwise set it a bit higher. 1412 */ 1413 if (ISSET(sc->sc_hwflags, COM_HW_HAYESP)) 1414 sc->sc_fifo = FIFO_DMA_MODE | FIFO_ENABLE | FIFO_TRIGGER_8; 1415 else if (ISSET(sc->sc_hwflags, COM_HW_FIFO)) 1416 sc->sc_fifo = FIFO_ENABLE | 1417 (t->c_ospeed <= 1200 ? FIFO_TRIGGER_1 : 1418 t->c_ospeed <= 38400 ? FIFO_TRIGGER_8 : FIFO_TRIGGER_4); 1419 else 1420 sc->sc_fifo = 0; 1421 1422 /* And copy to tty. */ 1423 tp->t_ispeed = 0; 1424 tp->t_ospeed = t->c_ospeed; 1425 tp->t_cflag = t->c_cflag; 1426 1427 if (!sc->sc_heldchange) { 1428 if (sc->sc_tx_busy) { 1429 sc->sc_heldtbc = sc->sc_tbc; 1430 sc->sc_tbc = 0; 1431 sc->sc_heldchange = 1; 1432 } else 1433 com_loadchannelregs(sc); 1434 } 1435 1436 if (!ISSET(t->c_cflag, CHWFLOW)) { 1437 /* Disable the high water mark. */ 1438 sc->sc_r_hiwat = 0; 1439 sc->sc_r_lowat = 0; 1440 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1441 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1442 com_schedrx(sc); 1443 } 1444 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 1445 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 1446 com_hwiflow(sc); 1447 } 1448 } else { 1449 sc->sc_r_hiwat = com_rbuf_hiwat; 1450 sc->sc_r_lowat = com_rbuf_lowat; 1451 } 1452 1453 splx(s); 1454 1455 /* 1456 * Update the tty layer's idea of the carrier bit, in case we changed 1457 * CLOCAL or MDMBUF. We don't hang up here; we only do that by 1458 * explicit request. 1459 */ 1460 (void) (*linesw[tp->t_line].l_modem)(tp, ISSET(sc->sc_msr, MSR_DCD)); 1461 1462 #ifdef COM_DEBUG 1463 if (com_debug) 1464 comstatus(sc, "comparam "); 1465 #endif 1466 1467 if (!ISSET(t->c_cflag, CHWFLOW)) { 1468 if (sc->sc_tx_stopped) { 1469 sc->sc_tx_stopped = 0; 1470 comstart(tp); 1471 } 1472 } 1473 1474 return (0); 1475 } 1476 1477 void 1478 com_iflush(sc) 1479 struct com_softc *sc; 1480 { 1481 bus_space_tag_t iot = sc->sc_iot; 1482 bus_space_handle_t ioh = sc->sc_ioh; 1483 #ifdef DIAGNOSTIC 1484 int reg; 1485 #endif 1486 int timo; 1487 1488 #ifdef DIAGNOSTIC 1489 reg = 0xffff; 1490 #endif 1491 timo = 50000; 1492 /* flush any pending I/O */ 1493 while (ISSET(bus_space_read_1(iot, ioh, com_lsr), LSR_RXRDY) 1494 && --timo) 1495 #ifdef DIAGNOSTIC 1496 reg = 1497 #else 1498 (void) 1499 #endif 1500 bus_space_read_1(iot, ioh, com_data); 1501 #ifdef DIAGNOSTIC 1502 if (!timo) 1503 printf("%s: com_iflush timeout %02x\n", sc->sc_dev.dv_xname, 1504 reg); 1505 #endif 1506 } 1507 1508 void 1509 com_loadchannelregs(sc) 1510 struct com_softc *sc; 1511 { 1512 bus_space_tag_t iot = sc->sc_iot; 1513 bus_space_handle_t ioh = sc->sc_ioh; 1514 1515 /* XXXXX necessary? */ 1516 com_iflush(sc); 1517 1518 bus_space_write_1(iot, ioh, com_ier, 0); 1519 1520 if (ISSET(sc->sc_hwflags, COM_HW_FLOW)) { 1521 bus_space_write_1(iot, ioh, com_lcr, LCR_EERS); 1522 bus_space_write_1(iot, ioh, com_efr, sc->sc_efr); 1523 } 1524 bus_space_write_1(iot, ioh, com_lcr, sc->sc_lcr | LCR_DLAB); 1525 bus_space_write_1(iot, ioh, com_dlbl, sc->sc_dlbl); 1526 bus_space_write_1(iot, ioh, com_dlbh, sc->sc_dlbh); 1527 bus_space_write_1(iot, ioh, com_lcr, sc->sc_lcr); 1528 bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr_active = sc->sc_mcr); 1529 bus_space_write_1(iot, ioh, com_fifo, sc->sc_fifo); 1530 1531 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1532 } 1533 1534 int 1535 comhwiflow(tp, block) 1536 struct tty *tp; 1537 int block; 1538 { 1539 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1540 int s; 1541 1542 if (COM_ISALIVE(sc) == 0) 1543 return (0); 1544 1545 if (sc->sc_mcr_rts == 0) 1546 return (0); 1547 1548 s = splserial(); 1549 if (block) { 1550 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1551 SET(sc->sc_rx_flags, RX_TTY_BLOCKED); 1552 com_hwiflow(sc); 1553 } 1554 } else { 1555 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1556 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1557 com_schedrx(sc); 1558 } 1559 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1560 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED); 1561 com_hwiflow(sc); 1562 } 1563 } 1564 splx(s); 1565 return (1); 1566 } 1567 1568 /* 1569 * (un)block input via hw flowcontrol 1570 */ 1571 void 1572 com_hwiflow(sc) 1573 struct com_softc *sc; 1574 { 1575 bus_space_tag_t iot = sc->sc_iot; 1576 bus_space_handle_t ioh = sc->sc_ioh; 1577 1578 if (sc->sc_mcr_rts == 0) 1579 return; 1580 1581 if (ISSET(sc->sc_rx_flags, RX_ANY_BLOCK)) { 1582 CLR(sc->sc_mcr, sc->sc_mcr_rts); 1583 CLR(sc->sc_mcr_active, sc->sc_mcr_rts); 1584 } else { 1585 SET(sc->sc_mcr, sc->sc_mcr_rts); 1586 SET(sc->sc_mcr_active, sc->sc_mcr_rts); 1587 } 1588 bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr_active); 1589 } 1590 1591 1592 void 1593 comstart(tp) 1594 struct tty *tp; 1595 { 1596 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1597 bus_space_tag_t iot = sc->sc_iot; 1598 bus_space_handle_t ioh = sc->sc_ioh; 1599 int s; 1600 1601 if (COM_ISALIVE(sc) == 0) 1602 return; 1603 1604 s = spltty(); 1605 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 1606 goto out; 1607 if (sc->sc_tx_stopped) 1608 goto out; 1609 1610 if (tp->t_outq.c_cc <= tp->t_lowat) { 1611 if (ISSET(tp->t_state, TS_ASLEEP)) { 1612 CLR(tp->t_state, TS_ASLEEP); 1613 wakeup(&tp->t_outq); 1614 } 1615 selwakeup(&tp->t_wsel); 1616 if (tp->t_outq.c_cc == 0) 1617 goto out; 1618 } 1619 1620 /* Grab the first contiguous region of buffer space. */ 1621 { 1622 u_char *tba; 1623 int tbc; 1624 1625 tba = tp->t_outq.c_cf; 1626 tbc = ndqb(&tp->t_outq, 0); 1627 1628 (void)splserial(); 1629 1630 sc->sc_tba = tba; 1631 sc->sc_tbc = tbc; 1632 } 1633 1634 SET(tp->t_state, TS_BUSY); 1635 sc->sc_tx_busy = 1; 1636 1637 /* Enable transmit completion interrupts if necessary. */ 1638 if (!ISSET(sc->sc_ier, IER_ETXRDY)) { 1639 SET(sc->sc_ier, IER_ETXRDY); 1640 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1641 } 1642 1643 /* Output the first chunk of the contiguous buffer. */ 1644 { 1645 int n; 1646 1647 n = sc->sc_tbc; 1648 if (n > sc->sc_fifolen) 1649 n = sc->sc_fifolen; 1650 bus_space_write_multi_1(iot, ioh, com_data, sc->sc_tba, n); 1651 sc->sc_tbc -= n; 1652 sc->sc_tba += n; 1653 } 1654 out: 1655 splx(s); 1656 return; 1657 } 1658 1659 /* 1660 * Stop output on a line. 1661 */ 1662 void 1663 comstop(tp, flag) 1664 struct tty *tp; 1665 int flag; 1666 { 1667 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1668 int s; 1669 1670 s = splserial(); 1671 if (ISSET(tp->t_state, TS_BUSY)) { 1672 /* Stop transmitting at the next chunk. */ 1673 sc->sc_tbc = 0; 1674 sc->sc_heldtbc = 0; 1675 if (!ISSET(tp->t_state, TS_TTSTOP)) 1676 SET(tp->t_state, TS_FLUSH); 1677 } 1678 splx(s); 1679 } 1680 1681 void 1682 comdiag(arg) 1683 void *arg; 1684 { 1685 struct com_softc *sc = arg; 1686 int overflows, floods; 1687 int s; 1688 1689 s = splserial(); 1690 overflows = sc->sc_overflows; 1691 sc->sc_overflows = 0; 1692 floods = sc->sc_floods; 1693 sc->sc_floods = 0; 1694 sc->sc_errors = 0; 1695 splx(s); 1696 1697 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1698 sc->sc_dev.dv_xname, 1699 overflows, overflows == 1 ? "" : "s", 1700 floods, floods == 1 ? "" : "s"); 1701 } 1702 1703 integrate void 1704 com_rxsoft(sc, tp) 1705 struct com_softc *sc; 1706 struct tty *tp; 1707 { 1708 int (*rint) __P((int c, struct tty *tp)) = linesw[tp->t_line].l_rint; 1709 u_char *get, *end; 1710 u_int cc, scc; 1711 u_char lsr; 1712 int code; 1713 int s; 1714 1715 end = sc->sc_ebuf; 1716 get = sc->sc_rbget; 1717 scc = cc = com_rbuf_size - sc->sc_rbavail; 1718 1719 if (cc == com_rbuf_size) { 1720 sc->sc_floods++; 1721 if (sc->sc_errors++ == 0) 1722 callout_reset(&sc->sc_diag_callout, 60 * hz, 1723 comdiag, sc); 1724 } 1725 1726 while (cc) { 1727 code = get[0]; 1728 lsr = get[1]; 1729 if (ISSET(lsr, LSR_OE | LSR_BI | LSR_FE | LSR_PE)) { 1730 if (ISSET(lsr, LSR_OE)) { 1731 sc->sc_overflows++; 1732 if (sc->sc_errors++ == 0) 1733 callout_reset(&sc->sc_diag_callout, 1734 60 * hz, comdiag, sc); 1735 } 1736 if (ISSET(lsr, LSR_BI | LSR_FE)) 1737 SET(code, TTY_FE); 1738 if (ISSET(lsr, LSR_PE)) 1739 SET(code, TTY_PE); 1740 } 1741 if ((*rint)(code, tp) == -1) { 1742 /* 1743 * The line discipline's buffer is out of space. 1744 */ 1745 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1746 /* 1747 * We're either not using flow control, or the 1748 * line discipline didn't tell us to block for 1749 * some reason. Either way, we have no way to 1750 * know when there's more space available, so 1751 * just drop the rest of the data. 1752 */ 1753 get += cc << 1; 1754 if (get >= end) 1755 get -= com_rbuf_size << 1; 1756 cc = 0; 1757 } else { 1758 /* 1759 * Don't schedule any more receive processing 1760 * until the line discipline tells us there's 1761 * space available (through comhwiflow()). 1762 * Leave the rest of the data in the input 1763 * buffer. 1764 */ 1765 SET(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1766 } 1767 break; 1768 } 1769 get += 2; 1770 if (get >= end) 1771 get = sc->sc_rbuf; 1772 cc--; 1773 } 1774 1775 if (cc != scc) { 1776 sc->sc_rbget = get; 1777 s = splserial(); 1778 cc = sc->sc_rbavail += scc - cc; 1779 /* Buffers should be ok again, release possible block. */ 1780 if (cc >= sc->sc_r_lowat) { 1781 if (ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1782 CLR(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1783 SET(sc->sc_ier, IER_ERXRDY); 1784 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 1785 } 1786 if (ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED)) { 1787 CLR(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1788 com_hwiflow(sc); 1789 } 1790 } 1791 splx(s); 1792 } 1793 } 1794 1795 integrate void 1796 com_txsoft(sc, tp) 1797 struct com_softc *sc; 1798 struct tty *tp; 1799 { 1800 1801 CLR(tp->t_state, TS_BUSY); 1802 if (ISSET(tp->t_state, TS_FLUSH)) 1803 CLR(tp->t_state, TS_FLUSH); 1804 else 1805 ndflush(&tp->t_outq, (int)(sc->sc_tba - tp->t_outq.c_cf)); 1806 (*linesw[tp->t_line].l_start)(tp); 1807 } 1808 1809 integrate void 1810 com_stsoft(sc, tp) 1811 struct com_softc *sc; 1812 struct tty *tp; 1813 { 1814 u_char msr, delta; 1815 int s; 1816 1817 s = splserial(); 1818 msr = sc->sc_msr; 1819 delta = sc->sc_msr_delta; 1820 sc->sc_msr_delta = 0; 1821 splx(s); 1822 1823 if (ISSET(delta, sc->sc_msr_dcd)) { 1824 /* 1825 * Inform the tty layer that carrier detect changed. 1826 */ 1827 (void) (*linesw[tp->t_line].l_modem)(tp, ISSET(msr, MSR_DCD)); 1828 } 1829 1830 if (ISSET(delta, sc->sc_msr_cts)) { 1831 /* Block or unblock output according to flow control. */ 1832 if (ISSET(msr, sc->sc_msr_cts)) { 1833 sc->sc_tx_stopped = 0; 1834 (*linesw[tp->t_line].l_start)(tp); 1835 } else { 1836 sc->sc_tx_stopped = 1; 1837 } 1838 } 1839 1840 #ifdef COM_DEBUG 1841 if (com_debug) 1842 comstatus(sc, "com_stsoft"); 1843 #endif 1844 } 1845 1846 #ifdef __GENERIC_SOFT_INTERRUPTS 1847 void 1848 comsoft(arg) 1849 void *arg; 1850 { 1851 struct com_softc *sc = arg; 1852 struct tty *tp; 1853 1854 if (COM_ISALIVE(sc) == 0) 1855 return; 1856 1857 { 1858 #else 1859 void 1860 #ifndef __NO_SOFT_SERIAL_INTERRUPT 1861 comsoft() 1862 #else 1863 comsoft(arg) 1864 void *arg; 1865 #endif 1866 { 1867 struct com_softc *sc; 1868 struct tty *tp; 1869 int unit; 1870 #ifdef __NO_SOFT_SERIAL_INTERRUPT 1871 int s; 1872 1873 s = splsoftserial(); 1874 com_softintr_scheduled = 0; 1875 #endif 1876 1877 for (unit = 0; unit < com_cd.cd_ndevs; unit++) { 1878 sc = com_cd.cd_devs[unit]; 1879 if (sc == NULL || !ISSET(sc->sc_hwflags, COM_HW_DEV_OK)) 1880 continue; 1881 1882 if (COM_ISALIVE(sc) == 0) 1883 continue; 1884 1885 tp = sc->sc_tty; 1886 if (tp == NULL) 1887 continue; 1888 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) 1889 continue; 1890 #endif 1891 tp = sc->sc_tty; 1892 1893 if (sc->sc_rx_ready) { 1894 sc->sc_rx_ready = 0; 1895 com_rxsoft(sc, tp); 1896 } 1897 1898 if (sc->sc_st_check) { 1899 sc->sc_st_check = 0; 1900 com_stsoft(sc, tp); 1901 } 1902 1903 if (sc->sc_tx_done) { 1904 sc->sc_tx_done = 0; 1905 com_txsoft(sc, tp); 1906 } 1907 } 1908 1909 #ifndef __GENERIC_SOFT_INTERRUPTS 1910 #ifdef __NO_SOFT_SERIAL_INTERRUPT 1911 splx(s); 1912 #endif 1913 #endif 1914 } 1915 1916 #ifdef __ALIGN_BRACKET_LEVEL_FOR_CTAGS 1917 /* there has got to be a better way to do comsoft() */ 1918 }} 1919 #endif 1920 1921 int 1922 comintr(arg) 1923 void *arg; 1924 { 1925 struct com_softc *sc = arg; 1926 bus_space_tag_t iot = sc->sc_iot; 1927 bus_space_handle_t ioh = sc->sc_ioh; 1928 u_char *put, *end; 1929 u_int cc; 1930 u_char lsr, iir; 1931 1932 if (COM_ISALIVE(sc) == 0) 1933 return (0); 1934 1935 iir = bus_space_read_1(iot, ioh, com_iir); 1936 if (ISSET(iir, IIR_NOPEND)) 1937 return (0); 1938 1939 end = sc->sc_ebuf; 1940 put = sc->sc_rbput; 1941 cc = sc->sc_rbavail; 1942 1943 do { 1944 u_char msr, delta; 1945 1946 lsr = bus_space_read_1(iot, ioh, com_lsr); 1947 #if defined(DDB) || defined(KGDB) 1948 if (ISSET(lsr, LSR_BI)) { 1949 #ifdef DDB 1950 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 1951 console_debugger(); 1952 continue; 1953 } 1954 #endif 1955 #ifdef KGDB 1956 if (ISSET(sc->sc_hwflags, COM_HW_KGDB)) { 1957 kgdb_connect(1); 1958 continue; 1959 } 1960 #endif 1961 } 1962 #endif /* DDB || KGDB */ 1963 1964 if (ISSET(lsr, LSR_RCV_MASK) && 1965 !ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1966 while (cc > 0) { 1967 put[0] = bus_space_read_1(iot, ioh, com_data); 1968 put[1] = lsr; 1969 put += 2; 1970 if (put >= end) 1971 put = sc->sc_rbuf; 1972 cc--; 1973 1974 lsr = bus_space_read_1(iot, ioh, com_lsr); 1975 if (!ISSET(lsr, LSR_RCV_MASK)) 1976 break; 1977 } 1978 1979 /* 1980 * Current string of incoming characters ended because 1981 * no more data was available or we ran out of space. 1982 * Schedule a receive event if any data was received. 1983 * If we're out of space, turn off receive interrupts. 1984 */ 1985 sc->sc_rbput = put; 1986 sc->sc_rbavail = cc; 1987 if (!ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) 1988 sc->sc_rx_ready = 1; 1989 1990 /* 1991 * See if we are in danger of overflowing a buffer. If 1992 * so, use hardware flow control to ease the pressure. 1993 */ 1994 if (!ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED) && 1995 cc < sc->sc_r_hiwat) { 1996 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1997 com_hwiflow(sc); 1998 } 1999 2000 /* 2001 * If we're out of space, disable receive interrupts 2002 * until the queue has drained a bit. 2003 */ 2004 if (!cc) { 2005 SET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 2006 CLR(sc->sc_ier, IER_ERXRDY); 2007 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 2008 } 2009 } else { 2010 if ((iir & IIR_IMASK) == IIR_RXRDY) { 2011 bus_space_write_1(iot, ioh, com_ier, 0); 2012 delay(10); 2013 bus_space_write_1(iot, ioh, com_ier,sc->sc_ier); 2014 iir = IIR_NOPEND; 2015 continue; 2016 } 2017 } 2018 2019 msr = bus_space_read_1(iot, ioh, com_msr); 2020 delta = msr ^ sc->sc_msr; 2021 sc->sc_msr = msr; 2022 /* 2023 * Pulse-per-second (PSS) signals on edge of DCD? 2024 * Process these even if line discipline is ignoring DCD. 2025 */ 2026 if (delta & sc->sc_ppsmask) { 2027 struct timeval tv; 2028 if ((msr & sc->sc_ppsmask) == sc->sc_ppsassert) { 2029 /* XXX nanotime() */ 2030 microtime(&tv); 2031 TIMEVAL_TO_TIMESPEC(&tv, 2032 &sc->ppsinfo.assert_timestamp); 2033 if (sc->ppsparam.mode & PPS_OFFSETASSERT) { 2034 timespecadd(&sc->ppsinfo.assert_timestamp, 2035 &sc->ppsparam.assert_offset, 2036 &sc->ppsinfo.assert_timestamp); 2037 } 2038 2039 #ifdef PPS_SYNC 2040 if (sc->ppsparam.mode & PPS_HARDPPSONASSERT) 2041 hardpps(&tv, tv.tv_usec); 2042 #endif 2043 sc->ppsinfo.assert_sequence++; 2044 sc->ppsinfo.current_mode = sc->ppsparam.mode; 2045 2046 } else if ((msr & sc->sc_ppsmask) == sc->sc_ppsclear) { 2047 /* XXX nanotime() */ 2048 microtime(&tv); 2049 TIMEVAL_TO_TIMESPEC(&tv, 2050 &sc->ppsinfo.clear_timestamp); 2051 if (sc->ppsparam.mode & PPS_OFFSETCLEAR) { 2052 timespecadd(&sc->ppsinfo.clear_timestamp, 2053 &sc->ppsparam.clear_offset, 2054 &sc->ppsinfo.clear_timestamp); 2055 } 2056 2057 #ifdef PPS_SYNC 2058 if (sc->ppsparam.mode & PPS_HARDPPSONCLEAR) 2059 hardpps(&tv, tv.tv_usec); 2060 #endif 2061 sc->ppsinfo.clear_sequence++; 2062 sc->ppsinfo.current_mode = sc->ppsparam.mode; 2063 } 2064 } 2065 2066 /* 2067 * Process normal status changes 2068 */ 2069 if (ISSET(delta, sc->sc_msr_mask)) { 2070 SET(sc->sc_msr_delta, delta); 2071 2072 /* 2073 * Stop output immediately if we lose the output 2074 * flow control signal or carrier detect. 2075 */ 2076 if (ISSET(~msr, sc->sc_msr_mask)) { 2077 sc->sc_tbc = 0; 2078 sc->sc_heldtbc = 0; 2079 #ifdef COM_DEBUG 2080 if (com_debug) 2081 comstatus(sc, "comintr "); 2082 #endif 2083 } 2084 2085 sc->sc_st_check = 1; 2086 } 2087 } while (!ISSET((iir = bus_space_read_1(iot, ioh, com_iir)), IIR_NOPEND)); 2088 2089 /* 2090 * Done handling any receive interrupts. See if data can be 2091 * transmitted as well. Schedule tx done event if no data left 2092 * and tty was marked busy. 2093 */ 2094 if (ISSET(lsr, LSR_TXRDY)) { 2095 /* 2096 * If we've delayed a parameter change, do it now, and restart 2097 * output. 2098 */ 2099 if (sc->sc_heldchange) { 2100 com_loadchannelregs(sc); 2101 sc->sc_heldchange = 0; 2102 sc->sc_tbc = sc->sc_heldtbc; 2103 sc->sc_heldtbc = 0; 2104 } 2105 2106 /* Output the next chunk of the contiguous buffer, if any. */ 2107 if (sc->sc_tbc > 0) { 2108 int n; 2109 2110 n = sc->sc_tbc; 2111 if (n > sc->sc_fifolen) 2112 n = sc->sc_fifolen; 2113 bus_space_write_multi_1(iot, ioh, com_data, sc->sc_tba, n); 2114 sc->sc_tbc -= n; 2115 sc->sc_tba += n; 2116 } else { 2117 /* Disable transmit completion interrupts if necessary. */ 2118 if (ISSET(sc->sc_ier, IER_ETXRDY)) { 2119 CLR(sc->sc_ier, IER_ETXRDY); 2120 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 2121 } 2122 if (sc->sc_tx_busy) { 2123 sc->sc_tx_busy = 0; 2124 sc->sc_tx_done = 1; 2125 } 2126 } 2127 } 2128 2129 /* Wake up the poller. */ 2130 #ifdef __GENERIC_SOFT_INTERRUPTS 2131 softintr_schedule(sc->sc_si); 2132 #else 2133 #ifndef __NO_SOFT_SERIAL_INTERRUPT 2134 setsoftserial(); 2135 #else 2136 if (!com_softintr_scheduled) { 2137 com_softintr_scheduled = 1; 2138 callout_reset(&comsoft_callout, 1, comsoft, NULL); 2139 } 2140 #endif 2141 #endif 2142 2143 #if NRND > 0 && defined(RND_COM) 2144 rnd_add_uint32(&sc->rnd_source, iir | lsr); 2145 #endif 2146 2147 return (1); 2148 } 2149 2150 /* 2151 * The following functions are polled getc and putc routines, shared 2152 * by the console and kgdb glue. 2153 */ 2154 2155 int 2156 com_common_getc(iot, ioh) 2157 bus_space_tag_t iot; 2158 bus_space_handle_t ioh; 2159 { 2160 int s = splserial(); 2161 u_char stat, c; 2162 2163 /* block until a character becomes available */ 2164 while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_RXRDY)) 2165 ; 2166 2167 c = bus_space_read_1(iot, ioh, com_data); 2168 stat = bus_space_read_1(iot, ioh, com_iir); 2169 splx(s); 2170 return (c); 2171 } 2172 2173 void 2174 com_common_putc(iot, ioh, c) 2175 bus_space_tag_t iot; 2176 bus_space_handle_t ioh; 2177 int c; 2178 { 2179 int s = splserial(); 2180 int timo; 2181 2182 /* wait for any pending transmission to finish */ 2183 timo = 150000; 2184 while (!ISSET(bus_space_read_1(iot, ioh, com_lsr), LSR_TXRDY) && --timo) 2185 continue; 2186 2187 bus_space_write_1(iot, ioh, com_data, c); 2188 COM_BARRIER(iot, ioh, BR | BW); 2189 2190 /* wait for this transmission to complete */ 2191 timo = 1500000; 2192 while (!ISSET(bus_space_read_1(iot, ioh, com_lsr), LSR_TXRDY) && --timo) 2193 continue; 2194 2195 splx(s); 2196 } 2197 2198 /* 2199 * Initialize UART for use as console or KGDB line. 2200 */ 2201 int 2202 cominit(iot, iobase, rate, frequency, cflag, iohp) 2203 bus_space_tag_t iot; 2204 int iobase; 2205 int rate, frequency; 2206 tcflag_t cflag; 2207 bus_space_handle_t *iohp; 2208 { 2209 bus_space_handle_t ioh; 2210 2211 if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) 2212 return (ENOMEM); /* ??? */ 2213 2214 bus_space_write_1(iot, ioh, com_lcr, LCR_EERS); 2215 bus_space_write_1(iot, ioh, com_efr, 0); 2216 bus_space_write_1(iot, ioh, com_lcr, LCR_DLAB); 2217 rate = comspeed(rate, frequency); 2218 bus_space_write_1(iot, ioh, com_dlbl, rate); 2219 bus_space_write_1(iot, ioh, com_dlbh, rate >> 8); 2220 bus_space_write_1(iot, ioh, com_lcr, cflag2lcr(cflag)); 2221 bus_space_write_1(iot, ioh, com_mcr, MCR_DTR | MCR_RTS); 2222 bus_space_write_1(iot, ioh, com_fifo, 2223 FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_1); 2224 bus_space_write_1(iot, ioh, com_ier, 0); 2225 2226 *iohp = ioh; 2227 return (0); 2228 } 2229 2230 /* 2231 * Following are all routines needed for COM to act as console 2232 */ 2233 2234 int 2235 comcnattach(iot, iobase, rate, frequency, cflag) 2236 bus_space_tag_t iot; 2237 int iobase; 2238 int rate, frequency; 2239 tcflag_t cflag; 2240 { 2241 int res; 2242 static struct consdev comcons = { 2243 NULL, NULL, comcngetc, comcnputc, comcnpollc, NULL, 2244 NODEV, CN_NORMAL 2245 }; 2246 2247 res = cominit(iot, iobase, rate, frequency, cflag, &comconsioh); 2248 if (res) 2249 return (res); 2250 2251 cn_tab = &comcons; 2252 2253 comconstag = iot; 2254 comconsaddr = iobase; 2255 comconsrate = rate; 2256 comconscflag = cflag; 2257 2258 return (0); 2259 } 2260 2261 int 2262 comcngetc(dev) 2263 dev_t dev; 2264 { 2265 2266 return (com_common_getc(comconstag, comconsioh)); 2267 } 2268 2269 /* 2270 * Console kernel output character routine. 2271 */ 2272 void 2273 comcnputc(dev, c) 2274 dev_t dev; 2275 int c; 2276 { 2277 2278 com_common_putc(comconstag, comconsioh, c); 2279 } 2280 2281 void 2282 comcnpollc(dev, on) 2283 dev_t dev; 2284 int on; 2285 { 2286 2287 } 2288 2289 #ifdef KGDB 2290 int 2291 com_kgdb_attach(iot, iobase, rate, frequency, cflag) 2292 bus_space_tag_t iot; 2293 int iobase; 2294 int rate, frequency; 2295 tcflag_t cflag; 2296 { 2297 int res; 2298 2299 if (iot == comconstag && iobase == comconsaddr) 2300 return (EBUSY); /* cannot share with console */ 2301 2302 res = cominit(iot, iobase, rate, frequency, cflag, &com_kgdb_ioh); 2303 if (res) 2304 return (res); 2305 2306 kgdb_attach(com_kgdb_getc, com_kgdb_putc, NULL); 2307 kgdb_dev = 123; /* unneeded, only to satisfy some tests */ 2308 2309 com_kgdb_iot = iot; 2310 com_kgdb_addr = iobase; 2311 2312 return (0); 2313 } 2314 2315 /* ARGSUSED */ 2316 int 2317 com_kgdb_getc(arg) 2318 void *arg; 2319 { 2320 2321 return (com_common_getc(com_kgdb_iot, com_kgdb_ioh)); 2322 } 2323 2324 /* ARGSUSED */ 2325 void 2326 com_kgdb_putc(arg, c) 2327 void *arg; 2328 int c; 2329 { 2330 2331 return (com_common_putc(com_kgdb_iot, com_kgdb_ioh, c)); 2332 } 2333 #endif /* KGDB */ 2334 2335 /* helper function to identify the com ports used by 2336 console or KGDB (and not yet autoconf attached) */ 2337 int 2338 com_is_console(iot, iobase, ioh) 2339 bus_space_tag_t iot; 2340 int iobase; 2341 bus_space_handle_t *ioh; 2342 { 2343 bus_space_handle_t help; 2344 2345 if (!comconsattached && 2346 iot == comconstag && iobase == comconsaddr) 2347 help = comconsioh; 2348 #ifdef KGDB 2349 else if (!com_kgdb_attached && 2350 iot == com_kgdb_iot && iobase == com_kgdb_addr) 2351 help = com_kgdb_ioh; 2352 #endif 2353 else 2354 return (0); 2355 2356 if (ioh) 2357 *ioh = help; 2358 return (1); 2359 } 2360
Indexes created Thu Sep 25 16:09:42 GMT 2025