com.c revision 1.136
1 /* $NetBSD: com.c,v 1.136 1998/02/19 09:23:38 mycroft Exp $ */ 2 3 /*- 4 * Copyright (c) 1993, 1994, 1995, 1996, 1997 5 * Charles M. Hannum. All rights reserved. 6 * 7 * Interrupt processing and hardware flow control partly based on code from 8 * Onno van der Linden and Gordon Ross. 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 Charles M. Hannum. 21 * 4. The name of the author may not be used to endorse or promote products 22 * derived from this software without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 27 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 28 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 29 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 30 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 33 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 /* 37 * Copyright (c) 1991 The Regents of the University of California. 38 * All rights reserved. 39 * 40 * Redistribution and use in source and binary forms, with or without 41 * modification, are permitted provided that the following conditions 42 * are met: 43 * 1. Redistributions of source code must retain the above copyright 44 * notice, this list of conditions and the following disclaimer. 45 * 2. Redistributions in binary form must reproduce the above copyright 46 * notice, this list of conditions and the following disclaimer in the 47 * documentation and/or other materials provided with the distribution. 48 * 3. All advertising materials mentioning features or use of this software 49 * must display the following acknowledgement: 50 * This product includes software developed by the University of 51 * California, Berkeley and its contributors. 52 * 4. Neither the name of the University nor the names of its contributors 53 * may be used to endorse or promote products derived from this software 54 * without specific prior written permission. 55 * 56 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 57 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 58 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 59 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 60 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 61 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 62 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 63 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 64 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 65 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 66 * SUCH DAMAGE. 67 * 68 * @(#)com.c 7.5 (Berkeley) 5/16/91 69 */ 70 71 /* 72 * COM driver, uses National Semiconductor NS16450/NS16550AF UART 73 * Supports automatic hardware flow control on StarTech ST16C650A UART 74 */ 75 76 #include "rnd.h" 77 #if NRND > 0 && defined(RND_COM) 78 #include <sys/rnd.h> 79 #endif 80 81 #include <sys/param.h> 82 #include <sys/systm.h> 83 #include <sys/ioctl.h> 84 #include <sys/select.h> 85 #include <sys/tty.h> 86 #include <sys/proc.h> 87 #include <sys/user.h> 88 #include <sys/conf.h> 89 #include <sys/file.h> 90 #include <sys/uio.h> 91 #include <sys/kernel.h> 92 #include <sys/syslog.h> 93 #include <sys/types.h> 94 #include <sys/device.h> 95 #include <sys/malloc.h> 96 97 #include <machine/intr.h> 98 #include <machine/bus.h> 99 100 #include <dev/ic/comreg.h> 101 #include <dev/ic/comvar.h> 102 #include <dev/ic/ns16550reg.h> 103 #include <dev/ic/st16650reg.h> 104 #ifdef COM_HAYESP 105 #include <dev/ic/hayespreg.h> 106 #endif 107 #define com_lcr com_cfcr 108 #include <dev/cons.h> 109 110 #include "com.h" 111 112 #ifdef COM_HAYESP 113 int comprobeHAYESP __P((bus_space_handle_t hayespioh, struct com_softc *sc)); 114 #endif 115 116 #if defined(DDB) || defined(KGDB) 117 static void com_enable_debugport __P((struct com_softc *)); 118 #endif 119 void com_attach_subr __P((struct com_softc *sc)); 120 void com_config __P((struct com_softc *)); 121 int comspeed __P((long, long)); 122 static u_char cflag2lcr __P((tcflag_t)); 123 int comparam __P((struct tty *, struct termios *)); 124 void comstart __P((struct tty *)); 125 void comstop __P((struct tty *, int)); 126 int comhwiflow __P((struct tty *, int)); 127 128 void com_loadchannelregs __P((struct com_softc *)); 129 void com_hwiflow __P((struct com_softc *)); 130 void com_break __P((struct com_softc *, int)); 131 void com_modem __P((struct com_softc *, int)); 132 void com_iflush __P((struct com_softc *)); 133 134 int com_common_getc __P((bus_space_tag_t, bus_space_handle_t)); 135 void com_common_putc __P((bus_space_tag_t, bus_space_handle_t, int)); 136 137 /* XXX: These belong elsewhere */ 138 cdev_decl(com); 139 bdev_decl(com); 140 141 int comcngetc __P((dev_t)); 142 void comcnputc __P((dev_t, int)); 143 void comcnpollc __P((dev_t, int)); 144 145 #define integrate static inline 146 #ifdef __GENERIC_SOFT_INTERRUPTS 147 void comsoft __P((void *)); 148 #else 149 #ifndef __NO_SOFT_SERIAL_INTERRUPT 150 void comsoft __P((void)); 151 #else 152 void comsoft __P((void *)); 153 #endif 154 #endif 155 integrate void com_rxsoft __P((struct com_softc *, struct tty *)); 156 integrate void com_txsoft __P((struct com_softc *, struct tty *)); 157 integrate void com_stsoft __P((struct com_softc *, struct tty *)); 158 integrate void com_schedrx __P((struct com_softc *)); 159 void comdiag __P((void *)); 160 161 extern struct cfdriver com_cd; 162 163 /* 164 * Make this an option variable one can patch. 165 * But be warned: this must be a power of 2! 166 */ 167 u_int com_rbuf_size = COM_RING_SIZE; 168 169 /* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */ 170 u_int com_rbuf_hiwat = (COM_RING_SIZE * 1) / 4; 171 u_int com_rbuf_lowat = (COM_RING_SIZE * 3) / 4; 172 173 static int comconsaddr; 174 static bus_space_tag_t comconstag; 175 static bus_space_handle_t comconsioh; 176 static int comconsattached; 177 static int comconsrate; 178 static tcflag_t comconscflag; 179 180 static u_char tiocm_xxx2mcr __P((int)); 181 182 #ifndef __GENERIC_SOFT_INTERRUPTS 183 #ifdef __NO_SOFT_SERIAL_INTERRUPT 184 volatile int com_softintr_scheduled; 185 #endif 186 #endif 187 188 #ifdef KGDB 189 #include <sys/kgdb.h> 190 191 static int com_kgdb_addr; 192 static bus_space_tag_t com_kgdb_iot; 193 static bus_space_handle_t com_kgdb_ioh; 194 static int com_kgdb_attached; 195 196 int com_kgdb_getc __P((void *)); 197 void com_kgdb_putc __P((void *, int)); 198 #endif /* KGDB */ 199 200 #define COMUNIT(x) (minor(x)) 201 202 int 203 comspeed(speed, frequency) 204 long speed, frequency; 205 { 206 #define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */ 207 208 int x, err; 209 210 #if 0 211 if (speed == 0) 212 return (0); 213 #endif 214 if (speed <= 0) 215 return (-1); 216 x = divrnd(frequency / 16, speed); 217 if (x <= 0) 218 return (-1); 219 err = divrnd(((quad_t)frequency) * 1000 / 16, speed * x) - 1000; 220 if (err < 0) 221 err = -err; 222 if (err > COM_TOLERANCE) 223 return (-1); 224 return (x); 225 226 #undef divrnd(n, q) 227 } 228 229 #ifdef COM_DEBUG 230 int com_debug = 0; 231 232 void comstatus __P((struct com_softc *, char *)); 233 void 234 comstatus(sc, str) 235 struct com_softc *sc; 236 char *str; 237 { 238 struct tty *tp = sc->sc_tty; 239 240 printf("%s: %s %sclocal %sdcd %sts_carr_on %sdtr %stx_stopped\n", 241 sc->sc_dev.dv_xname, str, 242 ISSET(tp->t_cflag, CLOCAL) ? "+" : "-", 243 ISSET(sc->sc_msr, MSR_DCD) ? "+" : "-", 244 ISSET(tp->t_state, TS_CARR_ON) ? "+" : "-", 245 ISSET(sc->sc_mcr, MCR_DTR) ? "+" : "-", 246 sc->sc_tx_stopped ? "+" : "-"); 247 248 printf("%s: %s %scrtscts %scts %sts_ttstop %srts %xrx_flags\n", 249 sc->sc_dev.dv_xname, str, 250 ISSET(tp->t_cflag, CRTSCTS) ? "+" : "-", 251 ISSET(sc->sc_msr, MSR_CTS) ? "+" : "-", 252 ISSET(tp->t_state, TS_TTSTOP) ? "+" : "-", 253 ISSET(sc->sc_mcr, MCR_RTS) ? "+" : "-", 254 sc->sc_rx_flags); 255 } 256 #endif 257 258 int 259 comprobe1(iot, ioh, iobase) 260 bus_space_tag_t iot; 261 bus_space_handle_t ioh; 262 int iobase; 263 { 264 265 /* force access to id reg */ 266 bus_space_write_1(iot, ioh, com_lcr, 0); 267 bus_space_write_1(iot, ioh, com_iir, 0); 268 if (bus_space_read_1(iot, ioh, com_iir) & 0x38) 269 return (0); 270 271 return (1); 272 } 273 274 #ifdef COM_HAYESP 275 int 276 comprobeHAYESP(hayespioh, sc) 277 bus_space_handle_t hayespioh; 278 struct com_softc *sc; 279 { 280 char val, dips; 281 int combaselist[] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8 }; 282 bus_space_tag_t iot = sc->sc_iot; 283 284 /* 285 * Hayes ESP cards have two iobases. One is for compatibility with 286 * 16550 serial chips, and at the same ISA PC base addresses. The 287 * other is for ESP-specific enhanced features, and lies at a 288 * different addressing range entirely (0x140, 0x180, 0x280, or 0x300). 289 */ 290 291 /* Test for ESP signature */ 292 if ((bus_space_read_1(iot, hayespioh, 0) & 0xf3) == 0) 293 return (0); 294 295 /* 296 * ESP is present at ESP enhanced base address; unknown com port 297 */ 298 299 /* Get the dip-switch configurations */ 300 bus_space_write_1(iot, hayespioh, HAYESP_CMD1, HAYESP_GETDIPS); 301 dips = bus_space_read_1(iot, hayespioh, HAYESP_STATUS1); 302 303 /* Determine which com port this ESP card services: bits 0,1 of */ 304 /* dips is the port # (0-3); combaselist[val] is the com_iobase */ 305 if (sc->sc_iobase != combaselist[dips & 0x03]) 306 return (0); 307 308 printf(": ESP"); 309 310 /* Check ESP Self Test bits. */ 311 /* Check for ESP version 2.0: bits 4,5,6 == 010 */ 312 bus_space_write_1(iot, hayespioh, HAYESP_CMD1, HAYESP_GETTEST); 313 val = bus_space_read_1(iot, hayespioh, HAYESP_STATUS1); /* Clear reg1 */ 314 val = bus_space_read_1(iot, hayespioh, HAYESP_STATUS2); 315 if ((val & 0x70) < 0x20) { 316 printf("-old (%o)", val & 0x70); 317 /* we do not support the necessary features */ 318 return (0); 319 } 320 321 /* Check for ability to emulate 16550: bit 8 == 1 */ 322 if ((dips & 0x80) == 0) { 323 printf(" slave"); 324 /* XXX Does slave really mean no 16550 support?? */ 325 return (0); 326 } 327 328 /* 329 * If we made it this far, we are a full-featured ESP v2.0 (or 330 * better), at the correct com port address. 331 */ 332 333 SET(sc->sc_hwflags, COM_HW_HAYESP); 334 printf(", 1024 byte fifo\n"); 335 return (1); 336 } 337 #endif 338 339 #if defined(DDB) || defined(KGDB) 340 static void 341 com_enable_debugport(sc) 342 struct com_softc *sc; 343 { 344 int s; 345 346 /* Turn on line break interrupt, set carrier. */ 347 s = splserial(); 348 sc->sc_ier = IER_ERXRDY; 349 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 350 SET(sc->sc_mcr, MCR_DTR | MCR_RTS); 351 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_mcr, sc->sc_mcr); 352 splx(s); 353 } 354 #endif 355 356 void 357 com_attach_subr(sc) 358 struct com_softc *sc; 359 { 360 int iobase = sc->sc_iobase; 361 bus_space_tag_t iot = sc->sc_iot; 362 bus_space_handle_t ioh = sc->sc_ioh; 363 struct tty *tp; 364 #ifdef COM16650 365 u_int8_t lcr; 366 #endif 367 #ifdef COM_HAYESP 368 int hayesp_ports[] = { 0x140, 0x180, 0x280, 0x300, 0 }; 369 int *hayespp; 370 #endif 371 372 /* Disable interrupts before configuring the device. */ 373 sc->sc_ier = 0; 374 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 375 376 if (iot == comconstag && iobase == comconsaddr) { 377 comconsattached = 1; 378 379 /* Make sure the console is always "hardwired". */ 380 delay(1000); /* wait for output to finish */ 381 SET(sc->sc_hwflags, COM_HW_CONSOLE); 382 SET(sc->sc_swflags, TIOCFLAG_SOFTCAR); 383 } 384 385 #ifdef COM_HAYESP 386 /* Look for a Hayes ESP board. */ 387 for (hayespp = hayesp_ports; *hayespp != 0; hayespp++) { 388 bus_space_handle_t hayespioh; 389 390 #define HAYESP_NPORTS 8 /* XXX XXX XXX ??? ??? ??? */ 391 if (bus_space_map(iot, *hayespp, HAYESP_NPORTS, 0, &hayespioh)) 392 continue; 393 if (comprobeHAYESP(hayespioh, sc)) { 394 sc->sc_hayespioh = hayespioh; 395 sc->sc_fifolen = 1024; 396 397 break; 398 } 399 bus_space_unmap(iot, hayespioh, HAYESP_NPORTS); 400 } 401 /* No ESP; look for other things. */ 402 if (!ISSET(sc->sc_hwflags, COM_HW_HAYESP)) { 403 #endif 404 sc->sc_fifolen = 1; 405 /* look for a NS 16550AF UART with FIFOs */ 406 bus_space_write_1(iot, ioh, com_fifo, 407 FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_14); 408 delay(100); 409 if (ISSET(bus_space_read_1(iot, ioh, com_iir), IIR_FIFO_MASK) 410 == IIR_FIFO_MASK) 411 if (ISSET(bus_space_read_1(iot, ioh, com_fifo), FIFO_TRIGGER_14) 412 == FIFO_TRIGGER_14) { 413 SET(sc->sc_hwflags, COM_HW_FIFO); 414 415 #ifdef COM16650 416 /* 417 * IIR changes into the EFR if LCR is set to LCR_EERS 418 * on 16650s. We also know IIR != 0 at this point. 419 * Write 0 into the EFR, and read it. If the result 420 * is 0, we have a 16650. 421 * 422 * Older 16650s were broken; the test to detect them 423 * is taken from the Linux driver. Apparently 424 * setting DLAB enable gives access to the EFR on 425 * these chips. 426 */ 427 lcr = bus_space_read_1(iot, ioh, com_lcr); 428 bus_space_write_1(iot, ioh, com_lcr, LCR_EERS); 429 bus_space_write_1(iot, ioh, com_efr, 0); 430 if (bus_space_read_1(iot, ioh, com_efr) == 0) { 431 bus_space_write_1(iot, ioh, com_lcr, 432 lcr | LCR_DLAB); 433 if (bus_space_read_1(iot, ioh, com_efr) == 0) { 434 CLR(sc->sc_hwflags, COM_HW_FIFO); 435 sc->sc_fifolen = 0; 436 } else { 437 SET(sc->sc_hwflags, COM_HW_FLOW); 438 sc->sc_fifolen = 32; 439 } 440 } else 441 #endif 442 sc->sc_fifolen = 16; 443 444 #ifdef COM16650 445 bus_space_write_1(iot, ioh, com_lcr, lcr); 446 if (sc->sc_fifolen == 0) 447 printf(": st16650, broken fifo\n"); 448 else if (sc->sc_fifolen == 32) 449 printf(": st16650a, working fifo\n"); 450 else 451 #endif 452 printf(": ns16550a, working fifo\n"); 453 } else 454 printf(": ns16550, broken fifo\n"); 455 else 456 printf(": ns8250 or ns16450, no fifo\n"); 457 bus_space_write_1(iot, ioh, com_fifo, 0); 458 #ifdef COM_HAYESP 459 } 460 #endif 461 462 tp = ttymalloc(); 463 tp->t_oproc = comstart; 464 tp->t_param = comparam; 465 tp->t_hwiflow = comhwiflow; 466 tty_attach(tp); 467 468 sc->sc_tty = tp; 469 sc->sc_rbuf = malloc(com_rbuf_size << 1, M_DEVBUF, M_WAITOK); 470 sc->sc_ebuf = sc->sc_rbuf + (com_rbuf_size << 1); 471 472 if (!ISSET(sc->sc_hwflags, COM_HW_NOIEN)) 473 SET(sc->sc_mcr, MCR_IENABLE); 474 475 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 476 int maj; 477 478 /* locate the major number */ 479 for (maj = 0; maj < nchrdev; maj++) 480 if (cdevsw[maj].d_open == comopen) 481 break; 482 483 cn_tab->cn_dev = makedev(maj, sc->sc_dev.dv_unit); 484 485 printf("%s: console\n", sc->sc_dev.dv_xname); 486 } 487 488 #ifdef KGDB 489 /* 490 * Allow kgdb to "take over" this port. If this is 491 * the kgdb device, it has exclusive use. 492 */ 493 if (iot == com_kgdb_iot && iobase == com_kgdb_addr) { 494 com_kgdb_attached = 1; 495 496 SET(sc->sc_hwflags, COM_HW_KGDB); 497 printf("%s: kgdb\n", sc->sc_dev.dv_xname); 498 } 499 #endif 500 501 #ifdef __GENERIC_SOFT_INTERRUPTS 502 sc->sc_si = softintr_establish(IPL_SOFTSERIAL, comsoft, sc); 503 #endif 504 505 #if NRND > 0 && defined(RND_COM) 506 rnd_attach_source(&sc->rnd_source, sc->sc_dev.dv_xname, 507 RND_TYPE_TTY); 508 #endif 509 510 /* if there are no enable/disable functions, assume the device 511 is always enabled */ 512 if (!sc->enable) 513 sc->enabled = 1; 514 515 com_config(sc); 516 517 SET(sc->sc_hwflags, COM_HW_DEV_OK); 518 } 519 520 void 521 com_config(sc) 522 struct com_softc *sc; 523 { 524 bus_space_tag_t iot = sc->sc_iot; 525 bus_space_handle_t ioh = sc->sc_ioh; 526 527 /* Disable interrupts before configuring the device. */ 528 sc->sc_ier = 0; 529 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 530 531 #ifdef COM_HAYESP 532 /* Look for a Hayes ESP board. */ 533 if (ISSET(sc->sc_hwflags, COM_HW_HAYESP)) { 534 sc->sc_fifolen = 1024; 535 536 /* Set 16550 compatibility mode */ 537 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD1, 538 HAYESP_SETMODE); 539 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 540 HAYESP_MODE_FIFO|HAYESP_MODE_RTS| 541 HAYESP_MODE_SCALE); 542 543 /* Set RTS/CTS flow control */ 544 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD1, 545 HAYESP_SETFLOWTYPE); 546 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 547 HAYESP_FLOW_RTS); 548 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 549 HAYESP_FLOW_CTS); 550 551 /* Set flow control levels */ 552 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD1, 553 HAYESP_SETRXFLOW); 554 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 555 HAYESP_HIBYTE(HAYESP_RXHIWMARK)); 556 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 557 HAYESP_LOBYTE(HAYESP_RXHIWMARK)); 558 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 559 HAYESP_HIBYTE(HAYESP_RXLOWMARK)); 560 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 561 HAYESP_LOBYTE(HAYESP_RXLOWMARK)); 562 } 563 #endif 564 565 #ifdef DDB 566 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) 567 com_enable_debugport(sc); 568 #endif 569 570 #ifdef KGDB 571 /* 572 * Allow kgdb to "take over" this port. If this is 573 * the kgdb device, it has exclusive use. 574 */ 575 if (ISSET(sc->sc_hwflags, COM_HW_KGDB)) 576 com_enable_debugport(sc); 577 #endif 578 } 579 580 int 581 comopen(dev, flag, mode, p) 582 dev_t dev; 583 int flag, mode; 584 struct proc *p; 585 { 586 int unit = COMUNIT(dev); 587 struct com_softc *sc; 588 struct tty *tp; 589 int s, s2; 590 int error = 0; 591 592 if (unit >= com_cd.cd_ndevs) 593 return (ENXIO); 594 sc = com_cd.cd_devs[unit]; 595 if (!sc || !ISSET(sc->sc_hwflags, COM_HW_DEV_OK)) 596 return (ENXIO); 597 598 #ifdef KGDB 599 /* 600 * If this is the kgdb port, no other use is permitted. 601 */ 602 if (ISSET(sc->sc_hwflags, COM_HW_KGDB)) 603 return (EBUSY); 604 #endif 605 606 tp = sc->sc_tty; 607 608 if (ISSET(tp->t_state, TS_ISOPEN) && 609 ISSET(tp->t_state, TS_XCLUDE) && 610 p->p_ucred->cr_uid != 0) 611 return (EBUSY); 612 613 s = spltty(); 614 615 /* We need to set this early for the benefit of comsoft(). */ 616 SET(tp->t_state, TS_WOPEN); 617 618 /* 619 * Do the following iff this is a first open. 620 */ 621 if (!ISSET(tp->t_state, TS_ISOPEN)) { 622 struct termios t; 623 624 tp->t_dev = dev; 625 626 s2 = splserial(); 627 628 if (sc->enable) { 629 if ((*sc->enable)(sc)) { 630 splx(s); 631 printf("%s: device enable failed\n", 632 sc->sc_dev.dv_xname); 633 return (EIO); 634 } 635 sc->enabled = 1; 636 com_config(sc); 637 } 638 639 /* Turn on interrupts. */ 640 sc->sc_ier = IER_ERXRDY | IER_ERLS | IER_EMSC; 641 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 642 643 /* Fetch the current modem control status, needed later. */ 644 sc->sc_msr = bus_space_read_1(sc->sc_iot, sc->sc_ioh, com_msr); 645 646 splx(s2); 647 648 /* 649 * Initialize the termios status to the defaults. Add in the 650 * sticky bits from TIOCSFLAGS. 651 */ 652 t.c_ispeed = 0; 653 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 654 t.c_ospeed = comconsrate; 655 t.c_cflag = comconscflag; 656 } else { 657 t.c_ospeed = TTYDEF_SPEED; 658 t.c_cflag = TTYDEF_CFLAG; 659 } 660 if (ISSET(sc->sc_swflags, TIOCFLAG_CLOCAL)) 661 SET(t.c_cflag, CLOCAL); 662 if (ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS)) 663 SET(t.c_cflag, CRTSCTS); 664 if (ISSET(sc->sc_swflags, TIOCFLAG_MDMBUF)) 665 SET(t.c_cflag, MDMBUF); 666 /* Make sure comparam() will do something. */ 667 tp->t_ospeed = 0; 668 (void) comparam(tp, &t); 669 tp->t_iflag = TTYDEF_IFLAG; 670 tp->t_oflag = TTYDEF_OFLAG; 671 tp->t_lflag = TTYDEF_LFLAG; 672 ttychars(tp); 673 ttsetwater(tp); 674 675 s2 = splserial(); 676 677 /* 678 * Turn on DTR. We must always do this, even if carrier is not 679 * present, because otherwise we'd have to use TIOCSDTR 680 * immediately after setting CLOCAL, which applications do not 681 * expect. We always assert DTR while the device is open 682 * unless explicitly requested to deassert it. 683 */ 684 com_modem(sc, 1); 685 686 /* Clear the input ring, and unblock. */ 687 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 688 sc->sc_rbavail = com_rbuf_size; 689 com_iflush(sc); 690 CLR(sc->sc_rx_flags, RX_ANY_BLOCK); 691 com_hwiflow(sc); 692 693 #ifdef COM_DEBUG 694 if (com_debug) 695 comstatus(sc, "comopen "); 696 #endif 697 698 splx(s2); 699 } 700 error = 0; 701 702 /* If we're doing a blocking open... */ 703 if (!ISSET(flag, O_NONBLOCK)) 704 /* ...then wait for carrier. */ 705 while (!ISSET(tp->t_state, TS_CARR_ON) && 706 !ISSET(tp->t_cflag, CLOCAL | MDMBUF)) { 707 error = ttysleep(tp, &tp->t_rawq, TTIPRI | PCATCH, 708 ttopen, 0); 709 if (error) { 710 /* 711 * If the open was interrupted and nobody 712 * else has the device open, then hang up. 713 */ 714 if (!ISSET(tp->t_state, TS_ISOPEN)) { 715 s2 = splserial(); 716 717 /* Hang up. */ 718 com_modem(sc, 0); 719 720 CLR(tp->t_state, TS_WOPEN); 721 ttwakeup(tp); 722 723 splx(s2); 724 } 725 break; 726 } 727 SET(tp->t_state, TS_WOPEN); 728 } 729 730 splx(s); 731 if (error == 0) 732 error = (*linesw[tp->t_line].l_open)(dev, tp); 733 return (error); 734 } 735 736 int 737 comclose(dev, flag, mode, p) 738 dev_t dev; 739 int flag, mode; 740 struct proc *p; 741 { 742 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 743 struct tty *tp = sc->sc_tty; 744 int s; 745 746 /* XXX This is for cons.c. */ 747 if (!ISSET(tp->t_state, TS_ISOPEN)) 748 return (0); 749 750 (*linesw[tp->t_line].l_close)(tp, flag); 751 ttyclose(tp); 752 753 s = splserial(); 754 755 /* If we were asserting flow control, then deassert it. */ 756 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 757 com_hwiflow(sc); 758 759 /* Clear any break condition set with TIOCSBRK. */ 760 com_break(sc, 0); 761 762 /* 763 * Hang up if necessary. Wait a bit, so the other side has time to 764 * notice even if we immediately open the port again. 765 */ 766 if (ISSET(tp->t_cflag, HUPCL)) { 767 com_modem(sc, 0); 768 (void) tsleep(sc, TTIPRI, ttclos, hz); 769 } 770 771 /* Turn off interrupts. */ 772 #ifdef DDB 773 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) 774 sc->sc_ier = IER_ERXRDY; /* interrupt on break */ 775 else 776 #endif 777 sc->sc_ier = 0; 778 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 779 780 if (sc->disable) { 781 if (sc->enabled) { 782 (*sc->disable)(sc); 783 sc->enabled = 0; 784 } 785 } 786 787 splx(s); 788 789 return (0); 790 } 791 792 int 793 comread(dev, uio, flag) 794 dev_t dev; 795 struct uio *uio; 796 int flag; 797 { 798 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 799 struct tty *tp = sc->sc_tty; 800 801 return ((*linesw[tp->t_line].l_read)(tp, uio, flag)); 802 } 803 804 int 805 comwrite(dev, uio, flag) 806 dev_t dev; 807 struct uio *uio; 808 int flag; 809 { 810 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 811 struct tty *tp = sc->sc_tty; 812 813 return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 814 } 815 816 struct tty * 817 comtty(dev) 818 dev_t dev; 819 { 820 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 821 struct tty *tp = sc->sc_tty; 822 823 return (tp); 824 } 825 826 static u_char 827 tiocm_xxx2mcr(data) 828 int data; 829 { 830 u_char m = 0; 831 832 if (ISSET(data, TIOCM_DTR)) 833 SET(m, MCR_DTR); 834 if (ISSET(data, TIOCM_RTS)) 835 SET(m, MCR_RTS); 836 return m; 837 } 838 839 int 840 comioctl(dev, cmd, data, flag, p) 841 dev_t dev; 842 u_long cmd; 843 caddr_t data; 844 int flag; 845 struct proc *p; 846 { 847 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 848 struct tty *tp = sc->sc_tty; 849 int error; 850 int s; 851 852 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); 853 if (error >= 0) 854 return (error); 855 856 error = ttioctl(tp, cmd, data, flag, p); 857 if (error >= 0) 858 return (error); 859 860 s = splserial(); 861 862 switch (cmd) { 863 case TIOCSBRK: 864 com_break(sc, 1); 865 break; 866 867 case TIOCCBRK: 868 com_break(sc, 0); 869 break; 870 871 case TIOCSDTR: 872 com_modem(sc, 1); 873 break; 874 875 case TIOCCDTR: 876 com_modem(sc, 0); 877 break; 878 879 case TIOCGFLAGS: 880 *(int *)data = sc->sc_swflags; 881 break; 882 883 case TIOCSFLAGS: 884 error = suser(p->p_ucred, &p->p_acflag); 885 if (error) 886 break; 887 sc->sc_swflags = *(int *)data; 888 break; 889 890 case TIOCMSET: 891 CLR(sc->sc_mcr, MCR_DTR | MCR_RTS); 892 /*FALLTHROUGH*/ 893 894 case TIOCMBIS: 895 SET(sc->sc_mcr, tiocm_xxx2mcr(*(int *)data)); 896 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_mcr, sc->sc_mcr); 897 break; 898 899 case TIOCMBIC: 900 CLR(sc->sc_mcr, tiocm_xxx2mcr(*(int *)data)); 901 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_mcr, sc->sc_mcr); 902 break; 903 904 case TIOCMGET: { 905 u_char m; 906 int bits = 0; 907 908 m = sc->sc_mcr; 909 if (ISSET(m, MCR_DTR)) 910 SET(bits, TIOCM_DTR); 911 if (ISSET(m, MCR_RTS)) 912 SET(bits, TIOCM_RTS); 913 m = sc->sc_msr; 914 if (ISSET(m, MSR_DCD)) 915 SET(bits, TIOCM_CD); 916 if (ISSET(m, MSR_CTS)) 917 SET(bits, TIOCM_CTS); 918 if (ISSET(m, MSR_DSR)) 919 SET(bits, TIOCM_DSR); 920 if (ISSET(m, MSR_RI | MSR_TERI)) 921 SET(bits, TIOCM_RI); 922 if (bus_space_read_1(sc->sc_iot, sc->sc_ioh, com_ier)) 923 SET(bits, TIOCM_LE); 924 *(int *)data = bits; 925 break; 926 } 927 default: 928 error = ENOTTY; 929 break; 930 } 931 932 splx(s); 933 934 #ifdef COM_DEBUG 935 if (com_debug) 936 comstatus(sc, "comioctl "); 937 #endif 938 939 return (error); 940 } 941 942 integrate void 943 com_schedrx(sc) 944 struct com_softc *sc; 945 { 946 947 sc->sc_rx_ready = 1; 948 949 /* Wake up the poller. */ 950 #ifdef __GENERIC_SOFT_INTERRUPTS 951 softintr_schedule(sc->sc_si); 952 #else 953 #ifndef __NO_SOFT_SERIAL_INTERRUPT 954 setsoftserial(); 955 #else 956 if (!com_softintr_scheduled) { 957 com_softintr_scheduled = 1; 958 timeout(comsoft, NULL, 1); 959 } 960 #endif 961 #endif 962 } 963 964 void 965 com_break(sc, onoff) 966 struct com_softc *sc; 967 int onoff; 968 { 969 970 if (onoff) 971 SET(sc->sc_lcr, LCR_SBREAK); 972 else 973 CLR(sc->sc_lcr, LCR_SBREAK); 974 975 if (!sc->sc_heldchange) { 976 if (sc->sc_tx_busy) { 977 sc->sc_heldtbc = sc->sc_tbc; 978 sc->sc_tbc = 0; 979 sc->sc_heldchange = 1; 980 } else 981 com_loadchannelregs(sc); 982 } 983 } 984 985 void 986 com_modem(sc, onoff) 987 struct com_softc *sc; 988 int onoff; 989 { 990 991 if (onoff) 992 SET(sc->sc_mcr, sc->sc_mcr_dtr); 993 else 994 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 995 996 if (!sc->sc_heldchange) { 997 if (sc->sc_tx_busy) { 998 sc->sc_heldtbc = sc->sc_tbc; 999 sc->sc_tbc = 0; 1000 sc->sc_heldchange = 1; 1001 } else 1002 com_loadchannelregs(sc); 1003 } 1004 } 1005 1006 static u_char 1007 cflag2lcr(cflag) 1008 tcflag_t cflag; 1009 { 1010 u_char lcr = 0; 1011 1012 switch (ISSET(cflag, CSIZE)) { 1013 case CS5: 1014 SET(lcr, LCR_5BITS); 1015 break; 1016 case CS6: 1017 SET(lcr, LCR_6BITS); 1018 break; 1019 case CS7: 1020 SET(lcr, LCR_7BITS); 1021 break; 1022 case CS8: 1023 SET(lcr, LCR_8BITS); 1024 break; 1025 } 1026 if (ISSET(cflag, PARENB)) { 1027 SET(lcr, LCR_PENAB); 1028 if (!ISSET(cflag, PARODD)) 1029 SET(lcr, LCR_PEVEN); 1030 } 1031 if (ISSET(cflag, CSTOPB)) 1032 SET(lcr, LCR_STOPB); 1033 1034 return (lcr); 1035 } 1036 1037 int 1038 comparam(tp, t) 1039 struct tty *tp; 1040 struct termios *t; 1041 { 1042 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1043 int ospeed = comspeed(t->c_ospeed, sc->sc_frequency); 1044 u_char lcr; 1045 int s; 1046 1047 /* Check requested parameters. */ 1048 if (ospeed < 0) 1049 return (EINVAL); 1050 if (t->c_ispeed && t->c_ispeed != t->c_ospeed) 1051 return (EINVAL); 1052 1053 /* 1054 * For the console, always force CLOCAL and !HUPCL, so that the port 1055 * is always active. 1056 */ 1057 if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) || 1058 ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 1059 SET(t->c_cflag, CLOCAL); 1060 CLR(t->c_cflag, HUPCL); 1061 } 1062 1063 /* 1064 * If there were no changes, don't do anything. This avoids dropping 1065 * input and improves performance when all we did was frob things like 1066 * VMIN and VTIME. 1067 */ 1068 if (tp->t_ospeed == t->c_ospeed && 1069 tp->t_cflag == t->c_cflag) 1070 return (0); 1071 1072 lcr = ISSET(sc->sc_lcr, LCR_SBREAK) | cflag2lcr(t->c_cflag); 1073 1074 s = splserial(); 1075 1076 sc->sc_lcr = lcr; 1077 1078 /* 1079 * If we're not in a mode that assumes a connection is present, then 1080 * ignore carrier changes. 1081 */ 1082 if (ISSET(t->c_cflag, CLOCAL | MDMBUF)) 1083 sc->sc_msr_dcd = 0; 1084 else 1085 sc->sc_msr_dcd = MSR_DCD; 1086 /* 1087 * Set the flow control pins depending on the current flow control 1088 * mode. 1089 */ 1090 if (ISSET(t->c_cflag, CRTSCTS)) { 1091 sc->sc_mcr_dtr = MCR_DTR; 1092 sc->sc_mcr_rts = MCR_RTS; 1093 sc->sc_msr_cts = MSR_CTS; 1094 sc->sc_efr = EFR_AUTORTS | EFR_AUTOCTS; 1095 } else if (ISSET(t->c_cflag, MDMBUF)) { 1096 /* 1097 * For DTR/DCD flow control, make sure we don't toggle DTR for 1098 * carrier detection. 1099 */ 1100 sc->sc_mcr_dtr = 0; 1101 sc->sc_mcr_rts = MCR_DTR; 1102 sc->sc_msr_cts = MSR_DCD; 1103 sc->sc_efr = 0; 1104 } else { 1105 /* 1106 * If no flow control, then always set RTS. This will make 1107 * the other side happy if it mistakenly thinks we're doing 1108 * RTS/CTS flow control. 1109 */ 1110 sc->sc_mcr_dtr = MCR_DTR | MCR_RTS; 1111 sc->sc_mcr_rts = 0; 1112 sc->sc_msr_cts = 0; 1113 sc->sc_efr = 0; 1114 if (ISSET(sc->sc_mcr, MCR_DTR)) 1115 SET(sc->sc_mcr, MCR_RTS); 1116 else 1117 CLR(sc->sc_mcr, MCR_RTS); 1118 } 1119 sc->sc_msr_mask = sc->sc_msr_cts | sc->sc_msr_dcd; 1120 1121 #if 0 1122 if (ospeed == 0) 1123 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 1124 else 1125 SET(sc->sc_mcr, sc->sc_mcr_dtr); 1126 #endif 1127 1128 sc->sc_dlbl = ospeed; 1129 sc->sc_dlbh = ospeed >> 8; 1130 1131 /* 1132 * Set the FIFO threshold based on the receive speed. 1133 * 1134 * * If it's a low speed, it's probably a mouse or some other 1135 * interactive device, so set the threshold low. 1136 * * If it's a high speed, trim the trigger level down to prevent 1137 * overflows. 1138 * * Otherwise set it a bit higher. 1139 */ 1140 if (ISSET(sc->sc_hwflags, COM_HW_HAYESP)) 1141 sc->sc_fifo = FIFO_DMA_MODE | FIFO_ENABLE | FIFO_TRIGGER_8; 1142 else if (ISSET(sc->sc_hwflags, COM_HW_FIFO)) 1143 sc->sc_fifo = FIFO_ENABLE | 1144 (t->c_ospeed <= 1200 ? FIFO_TRIGGER_1 : 1145 t->c_ospeed <= 38400 ? FIFO_TRIGGER_8 : FIFO_TRIGGER_4); 1146 else 1147 sc->sc_fifo = 0; 1148 1149 /* And copy to tty. */ 1150 tp->t_ispeed = 0; 1151 tp->t_ospeed = t->c_ospeed; 1152 tp->t_cflag = t->c_cflag; 1153 1154 if (!sc->sc_heldchange) { 1155 if (sc->sc_tx_busy) { 1156 sc->sc_heldtbc = sc->sc_tbc; 1157 sc->sc_tbc = 0; 1158 sc->sc_heldchange = 1; 1159 } else 1160 com_loadchannelregs(sc); 1161 } 1162 1163 if (!ISSET(t->c_cflag, CHWFLOW)) { 1164 /* Disable the high water mark. */ 1165 sc->sc_r_hiwat = 0; 1166 sc->sc_r_lowat = 0; 1167 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1168 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1169 com_schedrx(sc); 1170 } 1171 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 1172 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 1173 com_hwiflow(sc); 1174 } 1175 } else { 1176 sc->sc_r_hiwat = com_rbuf_hiwat; 1177 sc->sc_r_lowat = com_rbuf_lowat; 1178 } 1179 1180 splx(s); 1181 1182 skip: 1183 /* 1184 * Update the tty layer's idea of the carrier bit, in case we changed 1185 * CLOCAL or MDMBUF. We don't hang up here; we only do that by 1186 * explicit request. 1187 */ 1188 (void) (*linesw[tp->t_line].l_modem)(tp, ISSET(sc->sc_msr, MSR_DCD)); 1189 1190 #ifdef COM_DEBUG 1191 if (com_debug) 1192 comstatus(sc, "comparam "); 1193 #endif 1194 1195 if (!ISSET(t->c_cflag, CHWFLOW)) { 1196 if (sc->sc_tx_stopped) { 1197 sc->sc_tx_stopped = 0; 1198 comstart(tp); 1199 } 1200 } 1201 1202 return (0); 1203 } 1204 1205 void 1206 com_iflush(sc) 1207 struct com_softc *sc; 1208 { 1209 bus_space_tag_t iot = sc->sc_iot; 1210 bus_space_handle_t ioh = sc->sc_ioh; 1211 #ifdef DIAGNOSTIC 1212 int reg; 1213 #endif 1214 int timo; 1215 1216 #ifdef DIAGNOSTIC 1217 reg = 0xffff; 1218 #endif 1219 timo = 50000; 1220 /* flush any pending I/O */ 1221 while (ISSET(bus_space_read_1(iot, ioh, com_lsr), LSR_RXRDY) 1222 && --timo) 1223 #ifdef DIAGNOSTIC 1224 reg = 1225 #else 1226 (void) 1227 #endif 1228 bus_space_read_1(iot, ioh, com_data); 1229 #ifdef DIAGNOSTIC 1230 if (!timo) 1231 printf("%s: com_iflush timeout %02x\n", sc->sc_dev.dv_xname, 1232 reg); 1233 #endif 1234 } 1235 1236 void 1237 com_loadchannelregs(sc) 1238 struct com_softc *sc; 1239 { 1240 bus_space_tag_t iot = sc->sc_iot; 1241 bus_space_handle_t ioh = sc->sc_ioh; 1242 1243 /* XXXXX necessary? */ 1244 com_iflush(sc); 1245 1246 bus_space_write_1(iot, ioh, com_ier, 0); 1247 1248 if (ISSET(sc->sc_hwflags, COM_HW_FLOW)) { 1249 bus_space_write_1(iot, ioh, com_lcr, LCR_EERS); 1250 bus_space_write_1(iot, ioh, com_efr, sc->sc_efr); 1251 } 1252 bus_space_write_1(iot, ioh, com_lcr, sc->sc_lcr | LCR_DLAB); 1253 bus_space_write_1(iot, ioh, com_dlbl, sc->sc_dlbl); 1254 bus_space_write_1(iot, ioh, com_dlbh, sc->sc_dlbh); 1255 bus_space_write_1(iot, ioh, com_lcr, sc->sc_lcr); 1256 bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr_active = sc->sc_mcr); 1257 bus_space_write_1(iot, ioh, com_fifo, sc->sc_fifo); 1258 1259 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1260 } 1261 1262 int 1263 comhwiflow(tp, block) 1264 struct tty *tp; 1265 int block; 1266 { 1267 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1268 int s; 1269 1270 if (sc->sc_mcr_rts == 0) 1271 return (0); 1272 1273 s = splserial(); 1274 if (block) { 1275 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1276 SET(sc->sc_rx_flags, RX_TTY_BLOCKED); 1277 com_hwiflow(sc); 1278 } 1279 } else { 1280 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1281 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1282 com_schedrx(sc); 1283 } 1284 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1285 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED); 1286 com_hwiflow(sc); 1287 } 1288 } 1289 splx(s); 1290 return (1); 1291 } 1292 1293 /* 1294 * (un)block input via hw flowcontrol 1295 */ 1296 void 1297 com_hwiflow(sc) 1298 struct com_softc *sc; 1299 { 1300 bus_space_tag_t iot = sc->sc_iot; 1301 bus_space_handle_t ioh = sc->sc_ioh; 1302 1303 if (sc->sc_mcr_rts == 0) 1304 return; 1305 1306 if (ISSET(sc->sc_rx_flags, RX_ANY_BLOCK)) { 1307 CLR(sc->sc_mcr, sc->sc_mcr_rts); 1308 CLR(sc->sc_mcr_active, sc->sc_mcr_rts); 1309 } else { 1310 SET(sc->sc_mcr, sc->sc_mcr_rts); 1311 SET(sc->sc_mcr_active, sc->sc_mcr_rts); 1312 } 1313 bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr_active); 1314 } 1315 1316 1317 void 1318 comstart(tp) 1319 struct tty *tp; 1320 { 1321 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1322 bus_space_tag_t iot = sc->sc_iot; 1323 bus_space_handle_t ioh = sc->sc_ioh; 1324 int s; 1325 1326 s = spltty(); 1327 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 1328 goto out; 1329 if (sc->sc_tx_stopped) 1330 goto out; 1331 1332 if (tp->t_outq.c_cc <= tp->t_lowat) { 1333 if (ISSET(tp->t_state, TS_ASLEEP)) { 1334 CLR(tp->t_state, TS_ASLEEP); 1335 wakeup(&tp->t_outq); 1336 } 1337 selwakeup(&tp->t_wsel); 1338 if (tp->t_outq.c_cc == 0) 1339 goto out; 1340 } 1341 1342 /* Grab the first contiguous region of buffer space. */ 1343 { 1344 u_char *tba; 1345 int tbc; 1346 1347 tba = tp->t_outq.c_cf; 1348 tbc = ndqb(&tp->t_outq, 0); 1349 1350 (void)splserial(); 1351 1352 sc->sc_tba = tba; 1353 sc->sc_tbc = tbc; 1354 } 1355 1356 SET(tp->t_state, TS_BUSY); 1357 sc->sc_tx_busy = 1; 1358 1359 /* Enable transmit completion interrupts if necessary. */ 1360 if (!ISSET(sc->sc_ier, IER_ETXRDY)) { 1361 SET(sc->sc_ier, IER_ETXRDY); 1362 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1363 } 1364 1365 /* Output the first chunk of the contiguous buffer. */ 1366 { 1367 int n; 1368 1369 n = sc->sc_tbc; 1370 if (n > sc->sc_fifolen) 1371 n = sc->sc_fifolen; 1372 bus_space_write_multi_1(iot, ioh, com_data, sc->sc_tba, n); 1373 sc->sc_tbc -= n; 1374 sc->sc_tba += n; 1375 } 1376 out: 1377 splx(s); 1378 return; 1379 } 1380 1381 /* 1382 * Stop output on a line. 1383 */ 1384 void 1385 comstop(tp, flag) 1386 struct tty *tp; 1387 int flag; 1388 { 1389 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1390 int s; 1391 1392 s = splserial(); 1393 if (ISSET(tp->t_state, TS_BUSY)) { 1394 /* Stop transmitting at the next chunk. */ 1395 sc->sc_tbc = 0; 1396 sc->sc_heldtbc = 0; 1397 if (!ISSET(tp->t_state, TS_TTSTOP)) 1398 SET(tp->t_state, TS_FLUSH); 1399 } 1400 splx(s); 1401 } 1402 1403 void 1404 comdiag(arg) 1405 void *arg; 1406 { 1407 struct com_softc *sc = arg; 1408 int overflows, floods; 1409 int s; 1410 1411 s = splserial(); 1412 overflows = sc->sc_overflows; 1413 sc->sc_overflows = 0; 1414 floods = sc->sc_floods; 1415 sc->sc_floods = 0; 1416 sc->sc_errors = 0; 1417 splx(s); 1418 1419 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1420 sc->sc_dev.dv_xname, 1421 overflows, overflows == 1 ? "" : "s", 1422 floods, floods == 1 ? "" : "s"); 1423 } 1424 1425 integrate void 1426 com_rxsoft(sc, tp) 1427 struct com_softc *sc; 1428 struct tty *tp; 1429 { 1430 int (*rint) __P((int c, struct tty *tp)) = linesw[tp->t_line].l_rint; 1431 u_char *get, *end; 1432 u_int cc, scc; 1433 u_char lsr; 1434 int code; 1435 int s; 1436 1437 end = sc->sc_ebuf; 1438 get = sc->sc_rbget; 1439 scc = cc = com_rbuf_size - sc->sc_rbavail; 1440 1441 if (cc == com_rbuf_size) { 1442 sc->sc_floods++; 1443 if (sc->sc_errors++ == 0) 1444 timeout(comdiag, sc, 60 * hz); 1445 } 1446 1447 while (cc) { 1448 code = get[0]; 1449 lsr = get[1]; 1450 if (ISSET(lsr, LSR_OE | LSR_BI | LSR_FE | LSR_PE)) { 1451 if (ISSET(lsr, LSR_OE)) { 1452 sc->sc_overflows++; 1453 if (sc->sc_errors++ == 0) 1454 timeout(comdiag, sc, 60 * hz); 1455 } 1456 if (ISSET(lsr, LSR_BI | LSR_FE)) 1457 SET(code, TTY_FE); 1458 if (ISSET(lsr, LSR_PE)) 1459 SET(code, TTY_PE); 1460 } 1461 if ((*rint)(code, tp) == -1) { 1462 /* 1463 * The line discipline's buffer is out of space. 1464 */ 1465 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1466 /* 1467 * We're either not using flow control, or the 1468 * line discipline didn't tell us to block for 1469 * some reason. Either way, we have no way to 1470 * know when there's more space available, so 1471 * just drop the rest of the data. 1472 */ 1473 get += cc << 1; 1474 if (get >= end) 1475 get -= com_rbuf_size << 1; 1476 cc = 0; 1477 } else { 1478 /* 1479 * Don't schedule any more receive processing 1480 * until the line discipline tells us there's 1481 * space available (through comhwiflow()). 1482 * Leave the rest of the data in the input 1483 * buffer. 1484 */ 1485 SET(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1486 } 1487 break; 1488 } 1489 get += 2; 1490 if (get >= end) 1491 get = sc->sc_rbuf; 1492 cc--; 1493 } 1494 1495 if (cc != scc) { 1496 sc->sc_rbget = get; 1497 s = splserial(); 1498 cc = sc->sc_rbavail += scc - cc; 1499 /* Buffers should be ok again, release possible block. */ 1500 if (cc >= sc->sc_r_lowat) { 1501 if (ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1502 CLR(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1503 SET(sc->sc_ier, IER_ERXRDY); 1504 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 1505 } 1506 if (ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED)) { 1507 CLR(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1508 com_hwiflow(sc); 1509 } 1510 } 1511 splx(s); 1512 } 1513 } 1514 1515 integrate void 1516 com_txsoft(sc, tp) 1517 struct com_softc *sc; 1518 struct tty *tp; 1519 { 1520 1521 CLR(tp->t_state, TS_BUSY); 1522 if (ISSET(tp->t_state, TS_FLUSH)) 1523 CLR(tp->t_state, TS_FLUSH); 1524 else 1525 ndflush(&tp->t_outq, (int)(sc->sc_tba - tp->t_outq.c_cf)); 1526 (*linesw[tp->t_line].l_start)(tp); 1527 } 1528 1529 integrate void 1530 com_stsoft(sc, tp) 1531 struct com_softc *sc; 1532 struct tty *tp; 1533 { 1534 u_char msr, delta; 1535 int s; 1536 1537 s = splserial(); 1538 msr = sc->sc_msr; 1539 delta = sc->sc_msr_delta; 1540 sc->sc_msr_delta = 0; 1541 splx(s); 1542 1543 if (ISSET(delta, sc->sc_msr_dcd)) { 1544 /* 1545 * Inform the tty layer that carrier detect changed. 1546 */ 1547 (void) (*linesw[tp->t_line].l_modem)(tp, ISSET(msr, MSR_DCD)); 1548 } 1549 1550 if (ISSET(delta, sc->sc_msr_cts)) { 1551 /* Block or unblock output according to flow control. */ 1552 if (ISSET(msr, sc->sc_msr_cts)) { 1553 sc->sc_tx_stopped = 0; 1554 (*linesw[tp->t_line].l_start)(tp); 1555 } else { 1556 sc->sc_tx_stopped = 1; 1557 } 1558 } 1559 1560 #ifdef COM_DEBUG 1561 if (com_debug) 1562 comstatus(sc, "com_stsoft"); 1563 #endif 1564 } 1565 1566 #ifdef __GENERIC_SOFT_INTERRUPTS 1567 void 1568 comsoft(arg) 1569 void *arg; 1570 { 1571 struct com_softc *sc = arg; 1572 struct tty *tp; 1573 1574 if (!sc->enabled) 1575 return; 1576 1577 { 1578 #else 1579 void 1580 #ifndef __NO_SOFT_SERIAL_INTERRUPT 1581 comsoft() 1582 #else 1583 comsoft(arg) 1584 void *arg; 1585 #endif 1586 { 1587 struct com_softc *sc; 1588 struct tty *tp; 1589 int unit; 1590 #ifdef __NO_SOFT_SERIAL_INTERRUPT 1591 int s; 1592 1593 s = splsoftserial(); 1594 com_softintr_scheduled = 0; 1595 #endif 1596 1597 for (unit = 0; unit < com_cd.cd_ndevs; unit++) { 1598 sc = com_cd.cd_devs[unit]; 1599 if (sc == NULL || !ISSET(sc->sc_hwflags, COM_HW_DEV_OK)) 1600 continue; 1601 1602 if (!sc->enabled) 1603 continue; 1604 1605 tp = sc->sc_tty; 1606 if (tp == NULL || !ISSET(tp->t_state, TS_ISOPEN | TS_WOPEN)) 1607 continue; 1608 #endif 1609 tp = sc->sc_tty; 1610 1611 if (sc->sc_rx_ready) { 1612 sc->sc_rx_ready = 0; 1613 com_rxsoft(sc, tp); 1614 } 1615 1616 if (sc->sc_st_check) { 1617 sc->sc_st_check = 0; 1618 com_stsoft(sc, tp); 1619 } 1620 1621 if (sc->sc_tx_done) { 1622 sc->sc_tx_done = 0; 1623 com_txsoft(sc, tp); 1624 } 1625 } 1626 1627 #ifndef __GENERIC_SOFT_INTERRUPTS 1628 #ifdef __NO_SOFT_SERIAL_INTERRUPT 1629 splx(s); 1630 #endif 1631 #endif 1632 } 1633 1634 int 1635 comintr(arg) 1636 void *arg; 1637 { 1638 struct com_softc *sc = arg; 1639 bus_space_tag_t iot = sc->sc_iot; 1640 bus_space_handle_t ioh = sc->sc_ioh; 1641 u_char *put, *end; 1642 u_int cc; 1643 u_char lsr, iir; 1644 1645 if (!sc->enabled) 1646 return (0); 1647 1648 iir = bus_space_read_1(iot, ioh, com_iir); 1649 if (ISSET(iir, IIR_NOPEND)) 1650 return (0); 1651 1652 end = sc->sc_ebuf; 1653 put = sc->sc_rbput; 1654 cc = sc->sc_rbavail; 1655 1656 do { 1657 u_char msr, delta; 1658 1659 lsr = bus_space_read_1(iot, ioh, com_lsr); 1660 #if defined(DDB) || defined(KGDB) 1661 if (ISSET(lsr, LSR_BI)) { 1662 #ifdef DDB 1663 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 1664 Debugger(); 1665 continue; 1666 } 1667 #endif 1668 #ifdef KGDB 1669 if (ISSET(sc->sc_hwflags, COM_HW_KGDB)) { 1670 kgdb_connect(1); 1671 continue; 1672 } 1673 #endif 1674 } 1675 #endif /* DDB || KGDB */ 1676 1677 if (ISSET(lsr, LSR_RCV_MASK) && 1678 !ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1679 while (cc > 0) { 1680 put[0] = bus_space_read_1(iot, ioh, com_data); 1681 put[1] = lsr; 1682 put += 2; 1683 if (put >= end) 1684 put = sc->sc_rbuf; 1685 cc--; 1686 1687 lsr = bus_space_read_1(iot, ioh, com_lsr); 1688 if (!ISSET(lsr, LSR_RCV_MASK)) 1689 break; 1690 } 1691 1692 /* 1693 * Current string of incoming characters ended because 1694 * no more data was available or we ran out of space. 1695 * Schedule a receive event if any data was received. 1696 * If we're out of space, turn off receive interrupts. 1697 */ 1698 sc->sc_rbput = put; 1699 sc->sc_rbavail = cc; 1700 if (!ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) 1701 sc->sc_rx_ready = 1; 1702 1703 /* 1704 * See if we are in danger of overflowing a buffer. If 1705 * so, use hardware flow control to ease the pressure. 1706 */ 1707 if (!ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED) && 1708 cc < sc->sc_r_hiwat) { 1709 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1710 com_hwiflow(sc); 1711 } 1712 1713 /* 1714 * If we're out of space, disable receive interrupts 1715 * until the queue has drained a bit. 1716 */ 1717 if (!cc) { 1718 SET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1719 CLR(sc->sc_ier, IER_ERXRDY); 1720 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1721 } 1722 } else { 1723 if ((iir & IIR_IMASK) == IIR_RXRDY) { 1724 bus_space_write_1(iot, ioh, com_ier, 0); 1725 delay(10); 1726 bus_space_write_1(iot, ioh, com_ier,sc->sc_ier); 1727 iir = IIR_NOPEND; 1728 continue; 1729 } 1730 } 1731 1732 msr = bus_space_read_1(iot, ioh, com_msr); 1733 delta = msr ^ sc->sc_msr; 1734 sc->sc_msr = msr; 1735 if (ISSET(delta, sc->sc_msr_mask)) { 1736 SET(sc->sc_msr_delta, delta); 1737 1738 /* 1739 * Stop output immediately if we lose the output 1740 * flow control signal or carrier detect. 1741 */ 1742 if (ISSET(~msr, sc->sc_msr_mask)) { 1743 sc->sc_tbc = 0; 1744 sc->sc_heldtbc = 0; 1745 #ifdef COM_DEBUG 1746 if (com_debug) 1747 comstatus(sc, "comintr "); 1748 #endif 1749 } 1750 1751 sc->sc_st_check = 1; 1752 } 1753 } while (!ISSET((iir = bus_space_read_1(iot, ioh, com_iir)), IIR_NOPEND)); 1754 1755 /* 1756 * Done handling any receive interrupts. See if data can be 1757 * transmitted as well. Schedule tx done event if no data left 1758 * and tty was marked busy. 1759 */ 1760 if (ISSET(lsr, LSR_TXRDY)) { 1761 /* 1762 * If we've delayed a parameter change, do it now, and restart 1763 * output. 1764 */ 1765 if (sc->sc_heldchange) { 1766 com_loadchannelregs(sc); 1767 sc->sc_heldchange = 0; 1768 sc->sc_tbc = sc->sc_heldtbc; 1769 sc->sc_heldtbc = 0; 1770 } 1771 1772 /* Output the next chunk of the contiguous buffer, if any. */ 1773 if (sc->sc_tbc > 0) { 1774 int n; 1775 1776 n = sc->sc_tbc; 1777 if (n > sc->sc_fifolen) 1778 n = sc->sc_fifolen; 1779 bus_space_write_multi_1(iot, ioh, com_data, sc->sc_tba, n); 1780 sc->sc_tbc -= n; 1781 sc->sc_tba += n; 1782 } else { 1783 /* Disable transmit completion interrupts if necessary. */ 1784 if (ISSET(sc->sc_ier, IER_ETXRDY)) { 1785 CLR(sc->sc_ier, IER_ETXRDY); 1786 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1787 } 1788 if (sc->sc_tx_busy) { 1789 sc->sc_tx_busy = 0; 1790 sc->sc_tx_done = 1; 1791 } 1792 } 1793 } 1794 1795 /* Wake up the poller. */ 1796 #ifdef __GENERIC_SOFT_INTERRUPTS 1797 softintr_schedule(sc->sc_si); 1798 #else 1799 #ifndef __NO_SOFT_SERIAL_INTERRUPT 1800 setsoftserial(); 1801 #else 1802 if (!com_softintr_scheduled) { 1803 com_softintr_scheduled = 1; 1804 timeout(comsoft, NULL, 1); 1805 } 1806 #endif 1807 #endif 1808 1809 #if NRND > 0 && defined(RND_COM) 1810 rnd_add_uint32(&sc->rnd_source, iir | lsr); 1811 #endif 1812 1813 return (1); 1814 } 1815 1816 /* 1817 * The following functions are polled getc and putc routines, shared 1818 * by the console and kgdb glue. 1819 */ 1820 1821 int 1822 com_common_getc(iot, ioh) 1823 bus_space_tag_t iot; 1824 bus_space_handle_t ioh; 1825 { 1826 int s = splserial(); 1827 u_char stat, c; 1828 1829 /* block until a character becomes available */ 1830 while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_RXRDY)) 1831 ; 1832 1833 c = bus_space_read_1(iot, ioh, com_data); 1834 stat = bus_space_read_1(iot, ioh, com_iir); 1835 splx(s); 1836 return (c); 1837 } 1838 1839 void 1840 com_common_putc(iot, ioh, c) 1841 bus_space_tag_t iot; 1842 bus_space_handle_t ioh; 1843 int c; 1844 { 1845 int s = splserial(); 1846 u_char stat; 1847 int timo; 1848 1849 /* wait for any pending transmission to finish */ 1850 timo = 50000; 1851 while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_TXRDY) 1852 && --timo) 1853 ; 1854 1855 bus_space_write_1(iot, ioh, com_data, c); 1856 /* wait for this transmission to complete */ 1857 timo = 1500000; 1858 while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_TXRDY) 1859 && --timo) 1860 ; 1861 1862 /* clear any interrupts generated by this transmission */ 1863 stat = bus_space_read_1(iot, ioh, com_iir); 1864 splx(s); 1865 } 1866 1867 /* 1868 * Initialize UART to known state. 1869 */ 1870 int 1871 cominit(iot, iobase, rate, frequency, cflag, iohp) 1872 bus_space_tag_t iot; 1873 int iobase; 1874 int rate, frequency; 1875 tcflag_t cflag; 1876 bus_space_handle_t *iohp; 1877 { 1878 bus_space_handle_t ioh; 1879 1880 if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) 1881 return (ENOMEM); /* ??? */ 1882 1883 bus_space_write_1(iot, ioh, com_lcr, LCR_EERS); 1884 bus_space_write_1(iot, ioh, com_efr, 0); 1885 bus_space_write_1(iot, ioh, com_lcr, LCR_DLAB); 1886 rate = comspeed(rate, frequency); 1887 bus_space_write_1(iot, ioh, com_dlbl, rate); 1888 bus_space_write_1(iot, ioh, com_dlbh, rate >> 8); 1889 bus_space_write_1(iot, ioh, com_lcr, cflag2lcr(cflag)); 1890 bus_space_write_1(iot, ioh, com_mcr, 0); 1891 bus_space_write_1(iot, ioh, com_fifo, 1892 FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_1); 1893 bus_space_write_1(iot, ioh, com_ier, 0); 1894 1895 *iohp = ioh; 1896 return (0); 1897 } 1898 1899 /* 1900 * Following are all routines needed for COM to act as console 1901 */ 1902 1903 int 1904 comcnattach(iot, iobase, rate, frequency, cflag) 1905 bus_space_tag_t iot; 1906 int iobase; 1907 int rate, frequency; 1908 tcflag_t cflag; 1909 { 1910 int res; 1911 static struct consdev comcons = { 1912 NULL, NULL, comcngetc, comcnputc, comcnpollc, NODEV, CN_NORMAL 1913 }; 1914 1915 res = cominit(iot, iobase, rate, frequency, cflag, &comconsioh); 1916 if (res) 1917 return (res); 1918 1919 cn_tab = &comcons; 1920 1921 comconstag = iot; 1922 comconsaddr = iobase; 1923 comconsrate = rate; 1924 comconscflag = cflag; 1925 1926 return (0); 1927 } 1928 1929 int 1930 comcngetc(dev) 1931 dev_t dev; 1932 { 1933 1934 return (com_common_getc(comconstag, comconsioh)); 1935 } 1936 1937 /* 1938 * Console kernel output character routine. 1939 */ 1940 void 1941 comcnputc(dev, c) 1942 dev_t dev; 1943 int c; 1944 { 1945 1946 com_common_putc(comconstag, comconsioh, c); 1947 } 1948 1949 void 1950 comcnpollc(dev, on) 1951 dev_t dev; 1952 int on; 1953 { 1954 1955 } 1956 1957 #ifdef KGDB 1958 int 1959 com_kgdb_attach(iot, iobase, rate, frequency, cflag) 1960 bus_space_tag_t iot; 1961 int iobase; 1962 int rate, frequency; 1963 tcflag_t cflag; 1964 { 1965 int res; 1966 1967 if (iot == comconstag && iobase == comconsaddr) 1968 return (EBUSY); /* cannot share with console */ 1969 1970 res = cominit(iot, iobase, rate, frequency, cflag, &com_kgdb_ioh); 1971 if (res) 1972 return (res); 1973 1974 kgdb_attach(com_kgdb_getc, com_kgdb_putc, NULL); 1975 kgdb_dev = 123; /* unneeded, only to satisfy some tests */ 1976 1977 com_kgdb_iot = iot; 1978 com_kgdb_addr = iobase; 1979 1980 return (0); 1981 } 1982 1983 /* ARGSUSED */ 1984 int 1985 com_kgdb_getc(arg) 1986 void *arg; 1987 { 1988 1989 return (com_common_getc(com_kgdb_iot, com_kgdb_ioh)); 1990 } 1991 1992 /* ARGSUSED */ 1993 void 1994 com_kgdb_putc(arg, c) 1995 void *arg; 1996 int c; 1997 { 1998 1999 return (com_common_putc(com_kgdb_iot, com_kgdb_ioh, c)); 2000 } 2001 #endif /* KGDB */ 2002 2003 /* helper function to identify the com ports used by 2004 console or KGDB (and not yet autoconf attached) */ 2005 int 2006 com_is_console(iot, iobase, ioh) 2007 bus_space_tag_t iot; 2008 int iobase; 2009 bus_space_handle_t *ioh; 2010 { 2011 bus_space_handle_t help; 2012 2013 if (!comconsattached && 2014 iot == comconstag && iobase == comconsaddr) 2015 help = comconsioh; 2016 #ifdef KGDB 2017 else if (!com_kgdb_attached && 2018 iot == com_kgdb_iot && iobase == com_kgdb_addr) 2019 help = com_kgdb_ioh; 2020 #endif 2021 else 2022 return (0); 2023 2024 if (ioh) 2025 *ioh = help; 2026 return (1); 2027 } 2028
Indexes created Mon Sep 22 13:09:51 GMT 2025