com.c revision 1.138
1 /* $NetBSD: com.c,v 1.138 1998/02/22 03:24:58 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 error = 0; 861 862 s = splserial(); 863 864 switch (cmd) { 865 case TIOCSBRK: 866 com_break(sc, 1); 867 break; 868 869 case TIOCCBRK: 870 com_break(sc, 0); 871 break; 872 873 case TIOCSDTR: 874 com_modem(sc, 1); 875 break; 876 877 case TIOCCDTR: 878 com_modem(sc, 0); 879 break; 880 881 case TIOCGFLAGS: 882 *(int *)data = sc->sc_swflags; 883 break; 884 885 case TIOCSFLAGS: 886 error = suser(p->p_ucred, &p->p_acflag); 887 if (error) 888 break; 889 sc->sc_swflags = *(int *)data; 890 break; 891 892 case TIOCMSET: 893 CLR(sc->sc_mcr, MCR_DTR | MCR_RTS); 894 /*FALLTHROUGH*/ 895 896 case TIOCMBIS: 897 SET(sc->sc_mcr, tiocm_xxx2mcr(*(int *)data)); 898 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_mcr, sc->sc_mcr); 899 break; 900 901 case TIOCMBIC: 902 CLR(sc->sc_mcr, tiocm_xxx2mcr(*(int *)data)); 903 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_mcr, sc->sc_mcr); 904 break; 905 906 case TIOCMGET: { 907 u_char m; 908 int bits = 0; 909 910 m = sc->sc_mcr; 911 if (ISSET(m, MCR_DTR)) 912 SET(bits, TIOCM_DTR); 913 if (ISSET(m, MCR_RTS)) 914 SET(bits, TIOCM_RTS); 915 m = sc->sc_msr; 916 if (ISSET(m, MSR_DCD)) 917 SET(bits, TIOCM_CD); 918 if (ISSET(m, MSR_CTS)) 919 SET(bits, TIOCM_CTS); 920 if (ISSET(m, MSR_DSR)) 921 SET(bits, TIOCM_DSR); 922 if (ISSET(m, MSR_RI | MSR_TERI)) 923 SET(bits, TIOCM_RI); 924 if (bus_space_read_1(sc->sc_iot, sc->sc_ioh, com_ier)) 925 SET(bits, TIOCM_LE); 926 *(int *)data = bits; 927 break; 928 } 929 default: 930 error = ENOTTY; 931 break; 932 } 933 934 splx(s); 935 936 #ifdef COM_DEBUG 937 if (com_debug) 938 comstatus(sc, "comioctl "); 939 #endif 940 941 return (error); 942 } 943 944 integrate void 945 com_schedrx(sc) 946 struct com_softc *sc; 947 { 948 949 sc->sc_rx_ready = 1; 950 951 /* Wake up the poller. */ 952 #ifdef __GENERIC_SOFT_INTERRUPTS 953 softintr_schedule(sc->sc_si); 954 #else 955 #ifndef __NO_SOFT_SERIAL_INTERRUPT 956 setsoftserial(); 957 #else 958 if (!com_softintr_scheduled) { 959 com_softintr_scheduled = 1; 960 timeout(comsoft, NULL, 1); 961 } 962 #endif 963 #endif 964 } 965 966 void 967 com_break(sc, onoff) 968 struct com_softc *sc; 969 int onoff; 970 { 971 972 if (onoff) 973 SET(sc->sc_lcr, LCR_SBREAK); 974 else 975 CLR(sc->sc_lcr, LCR_SBREAK); 976 977 if (!sc->sc_heldchange) { 978 if (sc->sc_tx_busy) { 979 sc->sc_heldtbc = sc->sc_tbc; 980 sc->sc_tbc = 0; 981 sc->sc_heldchange = 1; 982 } else 983 com_loadchannelregs(sc); 984 } 985 } 986 987 void 988 com_modem(sc, onoff) 989 struct com_softc *sc; 990 int onoff; 991 { 992 993 if (onoff) 994 SET(sc->sc_mcr, sc->sc_mcr_dtr); 995 else 996 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 997 998 if (!sc->sc_heldchange) { 999 if (sc->sc_tx_busy) { 1000 sc->sc_heldtbc = sc->sc_tbc; 1001 sc->sc_tbc = 0; 1002 sc->sc_heldchange = 1; 1003 } else 1004 com_loadchannelregs(sc); 1005 } 1006 } 1007 1008 static u_char 1009 cflag2lcr(cflag) 1010 tcflag_t cflag; 1011 { 1012 u_char lcr = 0; 1013 1014 switch (ISSET(cflag, CSIZE)) { 1015 case CS5: 1016 SET(lcr, LCR_5BITS); 1017 break; 1018 case CS6: 1019 SET(lcr, LCR_6BITS); 1020 break; 1021 case CS7: 1022 SET(lcr, LCR_7BITS); 1023 break; 1024 case CS8: 1025 SET(lcr, LCR_8BITS); 1026 break; 1027 } 1028 if (ISSET(cflag, PARENB)) { 1029 SET(lcr, LCR_PENAB); 1030 if (!ISSET(cflag, PARODD)) 1031 SET(lcr, LCR_PEVEN); 1032 } 1033 if (ISSET(cflag, CSTOPB)) 1034 SET(lcr, LCR_STOPB); 1035 1036 return (lcr); 1037 } 1038 1039 int 1040 comparam(tp, t) 1041 struct tty *tp; 1042 struct termios *t; 1043 { 1044 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1045 int ospeed = comspeed(t->c_ospeed, sc->sc_frequency); 1046 u_char lcr; 1047 int s; 1048 1049 /* Check requested parameters. */ 1050 if (ospeed < 0) 1051 return (EINVAL); 1052 if (t->c_ispeed && t->c_ispeed != t->c_ospeed) 1053 return (EINVAL); 1054 1055 /* 1056 * For the console, always force CLOCAL and !HUPCL, so that the port 1057 * is always active. 1058 */ 1059 if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) || 1060 ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 1061 SET(t->c_cflag, CLOCAL); 1062 CLR(t->c_cflag, HUPCL); 1063 } 1064 1065 /* 1066 * If there were no changes, don't do anything. This avoids dropping 1067 * input and improves performance when all we did was frob things like 1068 * VMIN and VTIME. 1069 */ 1070 if (tp->t_ospeed == t->c_ospeed && 1071 tp->t_cflag == t->c_cflag) 1072 return (0); 1073 1074 lcr = ISSET(sc->sc_lcr, LCR_SBREAK) | cflag2lcr(t->c_cflag); 1075 1076 s = splserial(); 1077 1078 sc->sc_lcr = lcr; 1079 1080 /* 1081 * If we're not in a mode that assumes a connection is present, then 1082 * ignore carrier changes. 1083 */ 1084 if (ISSET(t->c_cflag, CLOCAL | MDMBUF)) 1085 sc->sc_msr_dcd = 0; 1086 else 1087 sc->sc_msr_dcd = MSR_DCD; 1088 /* 1089 * Set the flow control pins depending on the current flow control 1090 * mode. 1091 */ 1092 if (ISSET(t->c_cflag, CRTSCTS)) { 1093 sc->sc_mcr_dtr = MCR_DTR; 1094 sc->sc_mcr_rts = MCR_RTS; 1095 sc->sc_msr_cts = MSR_CTS; 1096 sc->sc_efr = EFR_AUTORTS | EFR_AUTOCTS; 1097 } else if (ISSET(t->c_cflag, MDMBUF)) { 1098 /* 1099 * For DTR/DCD flow control, make sure we don't toggle DTR for 1100 * carrier detection. 1101 */ 1102 sc->sc_mcr_dtr = 0; 1103 sc->sc_mcr_rts = MCR_DTR; 1104 sc->sc_msr_cts = MSR_DCD; 1105 sc->sc_efr = 0; 1106 } else { 1107 /* 1108 * If no flow control, then always set RTS. This will make 1109 * the other side happy if it mistakenly thinks we're doing 1110 * RTS/CTS flow control. 1111 */ 1112 sc->sc_mcr_dtr = MCR_DTR | MCR_RTS; 1113 sc->sc_mcr_rts = 0; 1114 sc->sc_msr_cts = 0; 1115 sc->sc_efr = 0; 1116 if (ISSET(sc->sc_mcr, MCR_DTR)) 1117 SET(sc->sc_mcr, MCR_RTS); 1118 else 1119 CLR(sc->sc_mcr, MCR_RTS); 1120 } 1121 sc->sc_msr_mask = sc->sc_msr_cts | sc->sc_msr_dcd; 1122 1123 #if 0 1124 if (ospeed == 0) 1125 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 1126 else 1127 SET(sc->sc_mcr, sc->sc_mcr_dtr); 1128 #endif 1129 1130 sc->sc_dlbl = ospeed; 1131 sc->sc_dlbh = ospeed >> 8; 1132 1133 /* 1134 * Set the FIFO threshold based on the receive speed. 1135 * 1136 * * If it's a low speed, it's probably a mouse or some other 1137 * interactive device, so set the threshold low. 1138 * * If it's a high speed, trim the trigger level down to prevent 1139 * overflows. 1140 * * Otherwise set it a bit higher. 1141 */ 1142 if (ISSET(sc->sc_hwflags, COM_HW_HAYESP)) 1143 sc->sc_fifo = FIFO_DMA_MODE | FIFO_ENABLE | FIFO_TRIGGER_8; 1144 else if (ISSET(sc->sc_hwflags, COM_HW_FIFO)) 1145 sc->sc_fifo = FIFO_ENABLE | 1146 (t->c_ospeed <= 1200 ? FIFO_TRIGGER_1 : 1147 t->c_ospeed <= 38400 ? FIFO_TRIGGER_8 : FIFO_TRIGGER_4); 1148 else 1149 sc->sc_fifo = 0; 1150 1151 /* And copy to tty. */ 1152 tp->t_ispeed = 0; 1153 tp->t_ospeed = t->c_ospeed; 1154 tp->t_cflag = t->c_cflag; 1155 1156 if (!sc->sc_heldchange) { 1157 if (sc->sc_tx_busy) { 1158 sc->sc_heldtbc = sc->sc_tbc; 1159 sc->sc_tbc = 0; 1160 sc->sc_heldchange = 1; 1161 } else 1162 com_loadchannelregs(sc); 1163 } 1164 1165 if (!ISSET(t->c_cflag, CHWFLOW)) { 1166 /* Disable the high water mark. */ 1167 sc->sc_r_hiwat = 0; 1168 sc->sc_r_lowat = 0; 1169 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1170 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1171 com_schedrx(sc); 1172 } 1173 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 1174 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 1175 com_hwiflow(sc); 1176 } 1177 } else { 1178 sc->sc_r_hiwat = com_rbuf_hiwat; 1179 sc->sc_r_lowat = com_rbuf_lowat; 1180 } 1181 1182 splx(s); 1183 1184 /* 1185 * Update the tty layer's idea of the carrier bit, in case we changed 1186 * CLOCAL or MDMBUF. We don't hang up here; we only do that by 1187 * explicit request. 1188 */ 1189 (void) (*linesw[tp->t_line].l_modem)(tp, ISSET(sc->sc_msr, MSR_DCD)); 1190 1191 #ifdef COM_DEBUG 1192 if (com_debug) 1193 comstatus(sc, "comparam "); 1194 #endif 1195 1196 if (!ISSET(t->c_cflag, CHWFLOW)) { 1197 if (sc->sc_tx_stopped) { 1198 sc->sc_tx_stopped = 0; 1199 comstart(tp); 1200 } 1201 } 1202 1203 return (0); 1204 } 1205 1206 void 1207 com_iflush(sc) 1208 struct com_softc *sc; 1209 { 1210 bus_space_tag_t iot = sc->sc_iot; 1211 bus_space_handle_t ioh = sc->sc_ioh; 1212 #ifdef DIAGNOSTIC 1213 int reg; 1214 #endif 1215 int timo; 1216 1217 #ifdef DIAGNOSTIC 1218 reg = 0xffff; 1219 #endif 1220 timo = 50000; 1221 /* flush any pending I/O */ 1222 while (ISSET(bus_space_read_1(iot, ioh, com_lsr), LSR_RXRDY) 1223 && --timo) 1224 #ifdef DIAGNOSTIC 1225 reg = 1226 #else 1227 (void) 1228 #endif 1229 bus_space_read_1(iot, ioh, com_data); 1230 #ifdef DIAGNOSTIC 1231 if (!timo) 1232 printf("%s: com_iflush timeout %02x\n", sc->sc_dev.dv_xname, 1233 reg); 1234 #endif 1235 } 1236 1237 void 1238 com_loadchannelregs(sc) 1239 struct com_softc *sc; 1240 { 1241 bus_space_tag_t iot = sc->sc_iot; 1242 bus_space_handle_t ioh = sc->sc_ioh; 1243 1244 /* XXXXX necessary? */ 1245 com_iflush(sc); 1246 1247 bus_space_write_1(iot, ioh, com_ier, 0); 1248 1249 if (ISSET(sc->sc_hwflags, COM_HW_FLOW)) { 1250 bus_space_write_1(iot, ioh, com_lcr, LCR_EERS); 1251 bus_space_write_1(iot, ioh, com_efr, sc->sc_efr); 1252 } 1253 bus_space_write_1(iot, ioh, com_lcr, sc->sc_lcr | LCR_DLAB); 1254 bus_space_write_1(iot, ioh, com_dlbl, sc->sc_dlbl); 1255 bus_space_write_1(iot, ioh, com_dlbh, sc->sc_dlbh); 1256 bus_space_write_1(iot, ioh, com_lcr, sc->sc_lcr); 1257 bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr_active = sc->sc_mcr); 1258 bus_space_write_1(iot, ioh, com_fifo, sc->sc_fifo); 1259 1260 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1261 } 1262 1263 int 1264 comhwiflow(tp, block) 1265 struct tty *tp; 1266 int block; 1267 { 1268 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1269 int s; 1270 1271 if (sc->sc_mcr_rts == 0) 1272 return (0); 1273 1274 s = splserial(); 1275 if (block) { 1276 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1277 SET(sc->sc_rx_flags, RX_TTY_BLOCKED); 1278 com_hwiflow(sc); 1279 } 1280 } else { 1281 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1282 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1283 com_schedrx(sc); 1284 } 1285 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1286 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED); 1287 com_hwiflow(sc); 1288 } 1289 } 1290 splx(s); 1291 return (1); 1292 } 1293 1294 /* 1295 * (un)block input via hw flowcontrol 1296 */ 1297 void 1298 com_hwiflow(sc) 1299 struct com_softc *sc; 1300 { 1301 bus_space_tag_t iot = sc->sc_iot; 1302 bus_space_handle_t ioh = sc->sc_ioh; 1303 1304 if (sc->sc_mcr_rts == 0) 1305 return; 1306 1307 if (ISSET(sc->sc_rx_flags, RX_ANY_BLOCK)) { 1308 CLR(sc->sc_mcr, sc->sc_mcr_rts); 1309 CLR(sc->sc_mcr_active, sc->sc_mcr_rts); 1310 } else { 1311 SET(sc->sc_mcr, sc->sc_mcr_rts); 1312 SET(sc->sc_mcr_active, sc->sc_mcr_rts); 1313 } 1314 bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr_active); 1315 } 1316 1317 1318 void 1319 comstart(tp) 1320 struct tty *tp; 1321 { 1322 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1323 bus_space_tag_t iot = sc->sc_iot; 1324 bus_space_handle_t ioh = sc->sc_ioh; 1325 int s; 1326 1327 s = spltty(); 1328 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 1329 goto out; 1330 if (sc->sc_tx_stopped) 1331 goto out; 1332 1333 if (tp->t_outq.c_cc <= tp->t_lowat) { 1334 if (ISSET(tp->t_state, TS_ASLEEP)) { 1335 CLR(tp->t_state, TS_ASLEEP); 1336 wakeup(&tp->t_outq); 1337 } 1338 selwakeup(&tp->t_wsel); 1339 if (tp->t_outq.c_cc == 0) 1340 goto out; 1341 } 1342 1343 /* Grab the first contiguous region of buffer space. */ 1344 { 1345 u_char *tba; 1346 int tbc; 1347 1348 tba = tp->t_outq.c_cf; 1349 tbc = ndqb(&tp->t_outq, 0); 1350 1351 (void)splserial(); 1352 1353 sc->sc_tba = tba; 1354 sc->sc_tbc = tbc; 1355 } 1356 1357 SET(tp->t_state, TS_BUSY); 1358 sc->sc_tx_busy = 1; 1359 1360 /* Enable transmit completion interrupts if necessary. */ 1361 if (!ISSET(sc->sc_ier, IER_ETXRDY)) { 1362 SET(sc->sc_ier, IER_ETXRDY); 1363 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1364 } 1365 1366 /* Output the first chunk of the contiguous buffer. */ 1367 { 1368 int n; 1369 1370 n = sc->sc_tbc; 1371 if (n > sc->sc_fifolen) 1372 n = sc->sc_fifolen; 1373 bus_space_write_multi_1(iot, ioh, com_data, sc->sc_tba, n); 1374 sc->sc_tbc -= n; 1375 sc->sc_tba += n; 1376 } 1377 out: 1378 splx(s); 1379 return; 1380 } 1381 1382 /* 1383 * Stop output on a line. 1384 */ 1385 void 1386 comstop(tp, flag) 1387 struct tty *tp; 1388 int flag; 1389 { 1390 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1391 int s; 1392 1393 s = splserial(); 1394 if (ISSET(tp->t_state, TS_BUSY)) { 1395 /* Stop transmitting at the next chunk. */ 1396 sc->sc_tbc = 0; 1397 sc->sc_heldtbc = 0; 1398 if (!ISSET(tp->t_state, TS_TTSTOP)) 1399 SET(tp->t_state, TS_FLUSH); 1400 } 1401 splx(s); 1402 } 1403 1404 void 1405 comdiag(arg) 1406 void *arg; 1407 { 1408 struct com_softc *sc = arg; 1409 int overflows, floods; 1410 int s; 1411 1412 s = splserial(); 1413 overflows = sc->sc_overflows; 1414 sc->sc_overflows = 0; 1415 floods = sc->sc_floods; 1416 sc->sc_floods = 0; 1417 sc->sc_errors = 0; 1418 splx(s); 1419 1420 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1421 sc->sc_dev.dv_xname, 1422 overflows, overflows == 1 ? "" : "s", 1423 floods, floods == 1 ? "" : "s"); 1424 } 1425 1426 integrate void 1427 com_rxsoft(sc, tp) 1428 struct com_softc *sc; 1429 struct tty *tp; 1430 { 1431 int (*rint) __P((int c, struct tty *tp)) = linesw[tp->t_line].l_rint; 1432 u_char *get, *end; 1433 u_int cc, scc; 1434 u_char lsr; 1435 int code; 1436 int s; 1437 1438 end = sc->sc_ebuf; 1439 get = sc->sc_rbget; 1440 scc = cc = com_rbuf_size - sc->sc_rbavail; 1441 1442 if (cc == com_rbuf_size) { 1443 sc->sc_floods++; 1444 if (sc->sc_errors++ == 0) 1445 timeout(comdiag, sc, 60 * hz); 1446 } 1447 1448 while (cc) { 1449 code = get[0]; 1450 lsr = get[1]; 1451 if (ISSET(lsr, LSR_OE | LSR_BI | LSR_FE | LSR_PE)) { 1452 if (ISSET(lsr, LSR_OE)) { 1453 sc->sc_overflows++; 1454 if (sc->sc_errors++ == 0) 1455 timeout(comdiag, sc, 60 * hz); 1456 } 1457 if (ISSET(lsr, LSR_BI | LSR_FE)) 1458 SET(code, TTY_FE); 1459 if (ISSET(lsr, LSR_PE)) 1460 SET(code, TTY_PE); 1461 } 1462 if ((*rint)(code, tp) == -1) { 1463 /* 1464 * The line discipline's buffer is out of space. 1465 */ 1466 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1467 /* 1468 * We're either not using flow control, or the 1469 * line discipline didn't tell us to block for 1470 * some reason. Either way, we have no way to 1471 * know when there's more space available, so 1472 * just drop the rest of the data. 1473 */ 1474 get += cc << 1; 1475 if (get >= end) 1476 get -= com_rbuf_size << 1; 1477 cc = 0; 1478 } else { 1479 /* 1480 * Don't schedule any more receive processing 1481 * until the line discipline tells us there's 1482 * space available (through comhwiflow()). 1483 * Leave the rest of the data in the input 1484 * buffer. 1485 */ 1486 SET(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1487 } 1488 break; 1489 } 1490 get += 2; 1491 if (get >= end) 1492 get = sc->sc_rbuf; 1493 cc--; 1494 } 1495 1496 if (cc != scc) { 1497 sc->sc_rbget = get; 1498 s = splserial(); 1499 cc = sc->sc_rbavail += scc - cc; 1500 /* Buffers should be ok again, release possible block. */ 1501 if (cc >= sc->sc_r_lowat) { 1502 if (ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1503 CLR(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1504 SET(sc->sc_ier, IER_ERXRDY); 1505 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 1506 } 1507 if (ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED)) { 1508 CLR(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1509 com_hwiflow(sc); 1510 } 1511 } 1512 splx(s); 1513 } 1514 } 1515 1516 integrate void 1517 com_txsoft(sc, tp) 1518 struct com_softc *sc; 1519 struct tty *tp; 1520 { 1521 1522 CLR(tp->t_state, TS_BUSY); 1523 if (ISSET(tp->t_state, TS_FLUSH)) 1524 CLR(tp->t_state, TS_FLUSH); 1525 else 1526 ndflush(&tp->t_outq, (int)(sc->sc_tba - tp->t_outq.c_cf)); 1527 (*linesw[tp->t_line].l_start)(tp); 1528 } 1529 1530 integrate void 1531 com_stsoft(sc, tp) 1532 struct com_softc *sc; 1533 struct tty *tp; 1534 { 1535 u_char msr, delta; 1536 int s; 1537 1538 s = splserial(); 1539 msr = sc->sc_msr; 1540 delta = sc->sc_msr_delta; 1541 sc->sc_msr_delta = 0; 1542 splx(s); 1543 1544 if (ISSET(delta, sc->sc_msr_dcd)) { 1545 /* 1546 * Inform the tty layer that carrier detect changed. 1547 */ 1548 (void) (*linesw[tp->t_line].l_modem)(tp, ISSET(msr, MSR_DCD)); 1549 } 1550 1551 if (ISSET(delta, sc->sc_msr_cts)) { 1552 /* Block or unblock output according to flow control. */ 1553 if (ISSET(msr, sc->sc_msr_cts)) { 1554 sc->sc_tx_stopped = 0; 1555 (*linesw[tp->t_line].l_start)(tp); 1556 } else { 1557 sc->sc_tx_stopped = 1; 1558 } 1559 } 1560 1561 #ifdef COM_DEBUG 1562 if (com_debug) 1563 comstatus(sc, "com_stsoft"); 1564 #endif 1565 } 1566 1567 #ifdef __GENERIC_SOFT_INTERRUPTS 1568 void 1569 comsoft(arg) 1570 void *arg; 1571 { 1572 struct com_softc *sc = arg; 1573 struct tty *tp; 1574 1575 if (!sc->enabled) 1576 return; 1577 1578 { 1579 #else 1580 void 1581 #ifndef __NO_SOFT_SERIAL_INTERRUPT 1582 comsoft() 1583 #else 1584 comsoft(arg) 1585 void *arg; 1586 #endif 1587 { 1588 struct com_softc *sc; 1589 struct tty *tp; 1590 int unit; 1591 #ifdef __NO_SOFT_SERIAL_INTERRUPT 1592 int s; 1593 1594 s = splsoftserial(); 1595 com_softintr_scheduled = 0; 1596 #endif 1597 1598 for (unit = 0; unit < com_cd.cd_ndevs; unit++) { 1599 sc = com_cd.cd_devs[unit]; 1600 if (sc == NULL || !ISSET(sc->sc_hwflags, COM_HW_DEV_OK)) 1601 continue; 1602 1603 if (!sc->enabled) 1604 continue; 1605 1606 tp = sc->sc_tty; 1607 if (tp == NULL || !ISSET(tp->t_state, TS_ISOPEN | TS_WOPEN)) 1608 continue; 1609 #endif 1610 tp = sc->sc_tty; 1611 1612 if (sc->sc_rx_ready) { 1613 sc->sc_rx_ready = 0; 1614 com_rxsoft(sc, tp); 1615 } 1616 1617 if (sc->sc_st_check) { 1618 sc->sc_st_check = 0; 1619 com_stsoft(sc, tp); 1620 } 1621 1622 if (sc->sc_tx_done) { 1623 sc->sc_tx_done = 0; 1624 com_txsoft(sc, tp); 1625 } 1626 } 1627 1628 #ifndef __GENERIC_SOFT_INTERRUPTS 1629 #ifdef __NO_SOFT_SERIAL_INTERRUPT 1630 splx(s); 1631 #endif 1632 #endif 1633 } 1634 1635 int 1636 comintr(arg) 1637 void *arg; 1638 { 1639 struct com_softc *sc = arg; 1640 bus_space_tag_t iot = sc->sc_iot; 1641 bus_space_handle_t ioh = sc->sc_ioh; 1642 u_char *put, *end; 1643 u_int cc; 1644 u_char lsr, iir; 1645 1646 if (!sc->enabled) 1647 return (0); 1648 1649 iir = bus_space_read_1(iot, ioh, com_iir); 1650 if (ISSET(iir, IIR_NOPEND)) 1651 return (0); 1652 1653 end = sc->sc_ebuf; 1654 put = sc->sc_rbput; 1655 cc = sc->sc_rbavail; 1656 1657 do { 1658 u_char msr, delta; 1659 1660 lsr = bus_space_read_1(iot, ioh, com_lsr); 1661 #if defined(DDB) || defined(KGDB) 1662 if (ISSET(lsr, LSR_BI)) { 1663 #ifdef DDB 1664 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 1665 Debugger(); 1666 continue; 1667 } 1668 #endif 1669 #ifdef KGDB 1670 if (ISSET(sc->sc_hwflags, COM_HW_KGDB)) { 1671 kgdb_connect(1); 1672 continue; 1673 } 1674 #endif 1675 } 1676 #endif /* DDB || KGDB */ 1677 1678 if (ISSET(lsr, LSR_RCV_MASK) && 1679 !ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1680 while (cc > 0) { 1681 put[0] = bus_space_read_1(iot, ioh, com_data); 1682 put[1] = lsr; 1683 put += 2; 1684 if (put >= end) 1685 put = sc->sc_rbuf; 1686 cc--; 1687 1688 lsr = bus_space_read_1(iot, ioh, com_lsr); 1689 if (!ISSET(lsr, LSR_RCV_MASK)) 1690 break; 1691 } 1692 1693 /* 1694 * Current string of incoming characters ended because 1695 * no more data was available or we ran out of space. 1696 * Schedule a receive event if any data was received. 1697 * If we're out of space, turn off receive interrupts. 1698 */ 1699 sc->sc_rbput = put; 1700 sc->sc_rbavail = cc; 1701 if (!ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) 1702 sc->sc_rx_ready = 1; 1703 1704 /* 1705 * See if we are in danger of overflowing a buffer. If 1706 * so, use hardware flow control to ease the pressure. 1707 */ 1708 if (!ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED) && 1709 cc < sc->sc_r_hiwat) { 1710 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1711 com_hwiflow(sc); 1712 } 1713 1714 /* 1715 * If we're out of space, disable receive interrupts 1716 * until the queue has drained a bit. 1717 */ 1718 if (!cc) { 1719 SET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1720 CLR(sc->sc_ier, IER_ERXRDY); 1721 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1722 } 1723 } else { 1724 if ((iir & IIR_IMASK) == IIR_RXRDY) { 1725 bus_space_write_1(iot, ioh, com_ier, 0); 1726 delay(10); 1727 bus_space_write_1(iot, ioh, com_ier,sc->sc_ier); 1728 iir = IIR_NOPEND; 1729 continue; 1730 } 1731 } 1732 1733 msr = bus_space_read_1(iot, ioh, com_msr); 1734 delta = msr ^ sc->sc_msr; 1735 sc->sc_msr = msr; 1736 if (ISSET(delta, sc->sc_msr_mask)) { 1737 SET(sc->sc_msr_delta, delta); 1738 1739 /* 1740 * Stop output immediately if we lose the output 1741 * flow control signal or carrier detect. 1742 */ 1743 if (ISSET(~msr, sc->sc_msr_mask)) { 1744 sc->sc_tbc = 0; 1745 sc->sc_heldtbc = 0; 1746 #ifdef COM_DEBUG 1747 if (com_debug) 1748 comstatus(sc, "comintr "); 1749 #endif 1750 } 1751 1752 sc->sc_st_check = 1; 1753 } 1754 } while (!ISSET((iir = bus_space_read_1(iot, ioh, com_iir)), IIR_NOPEND)); 1755 1756 /* 1757 * Done handling any receive interrupts. See if data can be 1758 * transmitted as well. Schedule tx done event if no data left 1759 * and tty was marked busy. 1760 */ 1761 if (ISSET(lsr, LSR_TXRDY)) { 1762 /* 1763 * If we've delayed a parameter change, do it now, and restart 1764 * output. 1765 */ 1766 if (sc->sc_heldchange) { 1767 com_loadchannelregs(sc); 1768 sc->sc_heldchange = 0; 1769 sc->sc_tbc = sc->sc_heldtbc; 1770 sc->sc_heldtbc = 0; 1771 } 1772 1773 /* Output the next chunk of the contiguous buffer, if any. */ 1774 if (sc->sc_tbc > 0) { 1775 int n; 1776 1777 n = sc->sc_tbc; 1778 if (n > sc->sc_fifolen) 1779 n = sc->sc_fifolen; 1780 bus_space_write_multi_1(iot, ioh, com_data, sc->sc_tba, n); 1781 sc->sc_tbc -= n; 1782 sc->sc_tba += n; 1783 } else { 1784 /* Disable transmit completion interrupts if necessary. */ 1785 if (ISSET(sc->sc_ier, IER_ETXRDY)) { 1786 CLR(sc->sc_ier, IER_ETXRDY); 1787 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1788 } 1789 if (sc->sc_tx_busy) { 1790 sc->sc_tx_busy = 0; 1791 sc->sc_tx_done = 1; 1792 } 1793 } 1794 } 1795 1796 /* Wake up the poller. */ 1797 #ifdef __GENERIC_SOFT_INTERRUPTS 1798 softintr_schedule(sc->sc_si); 1799 #else 1800 #ifndef __NO_SOFT_SERIAL_INTERRUPT 1801 setsoftserial(); 1802 #else 1803 if (!com_softintr_scheduled) { 1804 com_softintr_scheduled = 1; 1805 timeout(comsoft, NULL, 1); 1806 } 1807 #endif 1808 #endif 1809 1810 #if NRND > 0 && defined(RND_COM) 1811 rnd_add_uint32(&sc->rnd_source, iir | lsr); 1812 #endif 1813 1814 return (1); 1815 } 1816 1817 /* 1818 * The following functions are polled getc and putc routines, shared 1819 * by the console and kgdb glue. 1820 */ 1821 1822 int 1823 com_common_getc(iot, ioh) 1824 bus_space_tag_t iot; 1825 bus_space_handle_t ioh; 1826 { 1827 int s = splserial(); 1828 u_char stat, c; 1829 1830 /* block until a character becomes available */ 1831 while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_RXRDY)) 1832 ; 1833 1834 c = bus_space_read_1(iot, ioh, com_data); 1835 stat = bus_space_read_1(iot, ioh, com_iir); 1836 splx(s); 1837 return (c); 1838 } 1839 1840 void 1841 com_common_putc(iot, ioh, c) 1842 bus_space_tag_t iot; 1843 bus_space_handle_t ioh; 1844 int c; 1845 { 1846 int s = splserial(); 1847 u_char stat; 1848 int timo; 1849 1850 /* wait for any pending transmission to finish */ 1851 timo = 50000; 1852 while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_TXRDY) 1853 && --timo) 1854 ; 1855 1856 bus_space_write_1(iot, ioh, com_data, c); 1857 /* wait for this transmission to complete */ 1858 timo = 1500000; 1859 while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_TXRDY) 1860 && --timo) 1861 ; 1862 1863 /* clear any interrupts generated by this transmission */ 1864 stat = bus_space_read_1(iot, ioh, com_iir); 1865 splx(s); 1866 } 1867 1868 /* 1869 * Initialize UART to known state. 1870 */ 1871 int 1872 cominit(iot, iobase, rate, frequency, cflag, iohp) 1873 bus_space_tag_t iot; 1874 int iobase; 1875 int rate, frequency; 1876 tcflag_t cflag; 1877 bus_space_handle_t *iohp; 1878 { 1879 bus_space_handle_t ioh; 1880 1881 if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) 1882 return (ENOMEM); /* ??? */ 1883 1884 bus_space_write_1(iot, ioh, com_lcr, LCR_EERS); 1885 bus_space_write_1(iot, ioh, com_efr, 0); 1886 bus_space_write_1(iot, ioh, com_lcr, LCR_DLAB); 1887 rate = comspeed(rate, frequency); 1888 bus_space_write_1(iot, ioh, com_dlbl, rate); 1889 bus_space_write_1(iot, ioh, com_dlbh, rate >> 8); 1890 bus_space_write_1(iot, ioh, com_lcr, cflag2lcr(cflag)); 1891 bus_space_write_1(iot, ioh, com_mcr, 0); 1892 bus_space_write_1(iot, ioh, com_fifo, 1893 FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_1); 1894 bus_space_write_1(iot, ioh, com_ier, 0); 1895 1896 *iohp = ioh; 1897 return (0); 1898 } 1899 1900 /* 1901 * Following are all routines needed for COM to act as console 1902 */ 1903 1904 int 1905 comcnattach(iot, iobase, rate, frequency, cflag) 1906 bus_space_tag_t iot; 1907 int iobase; 1908 int rate, frequency; 1909 tcflag_t cflag; 1910 { 1911 int res; 1912 static struct consdev comcons = { 1913 NULL, NULL, comcngetc, comcnputc, comcnpollc, NODEV, CN_NORMAL 1914 }; 1915 1916 res = cominit(iot, iobase, rate, frequency, cflag, &comconsioh); 1917 if (res) 1918 return (res); 1919 1920 cn_tab = &comcons; 1921 1922 comconstag = iot; 1923 comconsaddr = iobase; 1924 comconsrate = rate; 1925 comconscflag = cflag; 1926 1927 return (0); 1928 } 1929 1930 int 1931 comcngetc(dev) 1932 dev_t dev; 1933 { 1934 1935 return (com_common_getc(comconstag, comconsioh)); 1936 } 1937 1938 /* 1939 * Console kernel output character routine. 1940 */ 1941 void 1942 comcnputc(dev, c) 1943 dev_t dev; 1944 int c; 1945 { 1946 1947 com_common_putc(comconstag, comconsioh, c); 1948 } 1949 1950 void 1951 comcnpollc(dev, on) 1952 dev_t dev; 1953 int on; 1954 { 1955 1956 } 1957 1958 #ifdef KGDB 1959 int 1960 com_kgdb_attach(iot, iobase, rate, frequency, cflag) 1961 bus_space_tag_t iot; 1962 int iobase; 1963 int rate, frequency; 1964 tcflag_t cflag; 1965 { 1966 int res; 1967 1968 if (iot == comconstag && iobase == comconsaddr) 1969 return (EBUSY); /* cannot share with console */ 1970 1971 res = cominit(iot, iobase, rate, frequency, cflag, &com_kgdb_ioh); 1972 if (res) 1973 return (res); 1974 1975 kgdb_attach(com_kgdb_getc, com_kgdb_putc, NULL); 1976 kgdb_dev = 123; /* unneeded, only to satisfy some tests */ 1977 1978 com_kgdb_iot = iot; 1979 com_kgdb_addr = iobase; 1980 1981 return (0); 1982 } 1983 1984 /* ARGSUSED */ 1985 int 1986 com_kgdb_getc(arg) 1987 void *arg; 1988 { 1989 1990 return (com_common_getc(com_kgdb_iot, com_kgdb_ioh)); 1991 } 1992 1993 /* ARGSUSED */ 1994 void 1995 com_kgdb_putc(arg, c) 1996 void *arg; 1997 int c; 1998 { 1999 2000 return (com_common_putc(com_kgdb_iot, com_kgdb_ioh, c)); 2001 } 2002 #endif /* KGDB */ 2003 2004 /* helper function to identify the com ports used by 2005 console or KGDB (and not yet autoconf attached) */ 2006 int 2007 com_is_console(iot, iobase, ioh) 2008 bus_space_tag_t iot; 2009 int iobase; 2010 bus_space_handle_t *ioh; 2011 { 2012 bus_space_handle_t help; 2013 2014 if (!comconsattached && 2015 iot == comconstag && iobase == comconsaddr) 2016 help = comconsioh; 2017 #ifdef KGDB 2018 else if (!com_kgdb_attached && 2019 iot == com_kgdb_iot && iobase == com_kgdb_addr) 2020 help = com_kgdb_ioh; 2021 #endif 2022 else 2023 return (0); 2024 2025 if (ioh) 2026 *ioh = help; 2027 return (1); 2028 } 2029
Indexes created Wed Sep 24 05:09:52 GMT 2025