com.c revision 1.135
1 /* $NetBSD: com.c,v 1.135 1998/02/09 10:22:45 thorpej 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 /* 676 * Turn on DTR. We must always do this, even if carrier is not 677 * present, because otherwise we'd have to use TIOCSDTR 678 * immediately after setting CLOCAL, which applications do not 679 * expect. We always assert DTR while the device is open 680 * unless explicitly requested to deassert it. 681 */ 682 com_modem(sc, 1); 683 684 s2 = splserial(); 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 com_modem(sc, 0); 716 CLR(tp->t_state, TS_WOPEN); 717 ttwakeup(tp); 718 } 719 break; 720 } 721 SET(tp->t_state, TS_WOPEN); 722 } 723 724 splx(s); 725 if (error == 0) 726 error = (*linesw[tp->t_line].l_open)(dev, tp); 727 return (error); 728 } 729 730 int 731 comclose(dev, flag, mode, p) 732 dev_t dev; 733 int flag, mode; 734 struct proc *p; 735 { 736 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 737 struct tty *tp = sc->sc_tty; 738 int s; 739 740 /* XXX This is for cons.c. */ 741 if (!ISSET(tp->t_state, TS_ISOPEN)) 742 return (0); 743 744 (*linesw[tp->t_line].l_close)(tp, flag); 745 ttyclose(tp); 746 747 s = splserial(); 748 749 /* If we were asserting flow control, then deassert it. */ 750 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 751 com_hwiflow(sc); 752 753 splx(s); 754 755 /* Clear any break condition set with TIOCSBRK. */ 756 com_break(sc, 0); 757 758 /* 759 * Hang up if necessary. Wait a bit, so the other side has time to 760 * notice even if we immediately open the port again. 761 */ 762 if (ISSET(tp->t_cflag, HUPCL)) { 763 com_modem(sc, 0); 764 (void) tsleep(sc, TTIPRI, ttclos, hz); 765 } 766 767 s = splserial(); 768 769 /* Turn off interrupts. */ 770 #ifdef DDB 771 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) 772 sc->sc_ier = IER_ERXRDY; /* interrupt on break */ 773 else 774 #endif 775 sc->sc_ier = 0; 776 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 777 778 if (sc->disable) { 779 if (sc->enabled) { 780 (*sc->disable)(sc); 781 sc->enabled = 0; 782 } 783 } 784 785 splx(s); 786 787 return (0); 788 } 789 790 int 791 comread(dev, uio, flag) 792 dev_t dev; 793 struct uio *uio; 794 int flag; 795 { 796 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 797 struct tty *tp = sc->sc_tty; 798 799 return ((*linesw[tp->t_line].l_read)(tp, uio, flag)); 800 } 801 802 int 803 comwrite(dev, uio, flag) 804 dev_t dev; 805 struct uio *uio; 806 int flag; 807 { 808 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 809 struct tty *tp = sc->sc_tty; 810 811 return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 812 } 813 814 struct tty * 815 comtty(dev) 816 dev_t dev; 817 { 818 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 819 struct tty *tp = sc->sc_tty; 820 821 return (tp); 822 } 823 824 static u_char 825 tiocm_xxx2mcr(data) 826 int data; 827 { 828 u_char m = 0; 829 830 if (ISSET(data, TIOCM_DTR)) 831 SET(m, MCR_DTR); 832 if (ISSET(data, TIOCM_RTS)) 833 SET(m, MCR_RTS); 834 return m; 835 } 836 837 int 838 comioctl(dev, cmd, data, flag, p) 839 dev_t dev; 840 u_long cmd; 841 caddr_t data; 842 int flag; 843 struct proc *p; 844 { 845 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 846 struct tty *tp = sc->sc_tty; 847 int error; 848 849 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); 850 if (error >= 0) 851 return (error); 852 853 error = ttioctl(tp, cmd, data, flag, p); 854 if (error >= 0) 855 return (error); 856 857 switch (cmd) { 858 case TIOCSBRK: 859 com_break(sc, 1); 860 break; 861 862 case TIOCCBRK: 863 com_break(sc, 0); 864 break; 865 866 case TIOCSDTR: 867 com_modem(sc, 1); 868 break; 869 870 case TIOCCDTR: 871 com_modem(sc, 0); 872 break; 873 874 case TIOCGFLAGS: 875 *(int *)data = sc->sc_swflags; 876 break; 877 878 case TIOCSFLAGS: 879 error = suser(p->p_ucred, &p->p_acflag); 880 if (error) 881 return (error); 882 sc->sc_swflags = *(int *)data; 883 break; 884 885 case TIOCMSET: 886 CLR(sc->sc_mcr, MCR_DTR | MCR_RTS); 887 /*FALLTHROUGH*/ 888 889 case TIOCMBIS: 890 SET(sc->sc_mcr, tiocm_xxx2mcr(*(int *)data)); 891 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_mcr, sc->sc_mcr); 892 break; 893 894 case TIOCMBIC: 895 CLR(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 TIOCMGET: { 900 u_char m; 901 int bits = 0; 902 903 m = sc->sc_mcr; 904 if (ISSET(m, MCR_DTR)) 905 SET(bits, TIOCM_DTR); 906 if (ISSET(m, MCR_RTS)) 907 SET(bits, TIOCM_RTS); 908 m = sc->sc_msr; 909 if (ISSET(m, MSR_DCD)) 910 SET(bits, TIOCM_CD); 911 if (ISSET(m, MSR_CTS)) 912 SET(bits, TIOCM_CTS); 913 if (ISSET(m, MSR_DSR)) 914 SET(bits, TIOCM_DSR); 915 if (ISSET(m, MSR_RI | MSR_TERI)) 916 SET(bits, TIOCM_RI); 917 if (bus_space_read_1(sc->sc_iot, sc->sc_ioh, com_ier)) 918 SET(bits, TIOCM_LE); 919 *(int *)data = bits; 920 break; 921 } 922 default: 923 return (ENOTTY); 924 } 925 926 #ifdef COM_DEBUG 927 if (com_debug) 928 comstatus(sc, "comioctl "); 929 #endif 930 931 return (0); 932 } 933 934 integrate void 935 com_schedrx(sc) 936 struct com_softc *sc; 937 { 938 939 sc->sc_rx_ready = 1; 940 941 /* Wake up the poller. */ 942 #ifdef __GENERIC_SOFT_INTERRUPTS 943 softintr_schedule(sc->sc_si); 944 #else 945 #ifndef __NO_SOFT_SERIAL_INTERRUPT 946 setsoftserial(); 947 #else 948 if (!com_softintr_scheduled) { 949 com_softintr_scheduled = 1; 950 timeout(comsoft, NULL, 1); 951 } 952 #endif 953 #endif 954 } 955 956 void 957 com_break(sc, onoff) 958 struct com_softc *sc; 959 int onoff; 960 { 961 int s; 962 963 s = splserial(); 964 if (onoff) 965 SET(sc->sc_lcr, LCR_SBREAK); 966 else 967 CLR(sc->sc_lcr, LCR_SBREAK); 968 969 if (!sc->sc_heldchange) { 970 if (sc->sc_tx_busy) { 971 sc->sc_heldtbc = sc->sc_tbc; 972 sc->sc_tbc = 0; 973 sc->sc_heldchange = 1; 974 } else 975 com_loadchannelregs(sc); 976 } 977 splx(s); 978 } 979 980 void 981 com_modem(sc, onoff) 982 struct com_softc *sc; 983 int onoff; 984 { 985 int s; 986 987 s = splserial(); 988 if (onoff) 989 SET(sc->sc_mcr, sc->sc_mcr_dtr); 990 else 991 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 992 993 if (!sc->sc_heldchange) { 994 if (sc->sc_tx_busy) { 995 sc->sc_heldtbc = sc->sc_tbc; 996 sc->sc_tbc = 0; 997 sc->sc_heldchange = 1; 998 } else 999 com_loadchannelregs(sc); 1000 } 1001 splx(s); 1002 } 1003 1004 static u_char 1005 cflag2lcr(cflag) 1006 tcflag_t cflag; 1007 { 1008 u_char lcr = 0; 1009 1010 switch (ISSET(cflag, CSIZE)) { 1011 case CS5: 1012 SET(lcr, LCR_5BITS); 1013 break; 1014 case CS6: 1015 SET(lcr, LCR_6BITS); 1016 break; 1017 case CS7: 1018 SET(lcr, LCR_7BITS); 1019 break; 1020 case CS8: 1021 SET(lcr, LCR_8BITS); 1022 break; 1023 } 1024 if (ISSET(cflag, PARENB)) { 1025 SET(lcr, LCR_PENAB); 1026 if (!ISSET(cflag, PARODD)) 1027 SET(lcr, LCR_PEVEN); 1028 } 1029 if (ISSET(cflag, CSTOPB)) 1030 SET(lcr, LCR_STOPB); 1031 1032 return (lcr); 1033 } 1034 1035 int 1036 comparam(tp, t) 1037 struct tty *tp; 1038 struct termios *t; 1039 { 1040 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1041 int ospeed = comspeed(t->c_ospeed, sc->sc_frequency); 1042 u_char lcr; 1043 int s; 1044 1045 /* Check requested parameters. */ 1046 if (ospeed < 0) 1047 return (EINVAL); 1048 if (t->c_ispeed && t->c_ispeed != t->c_ospeed) 1049 return (EINVAL); 1050 1051 /* 1052 * For the console, always force CLOCAL and !HUPCL, so that the port 1053 * is always active. 1054 */ 1055 if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) || 1056 ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 1057 SET(t->c_cflag, CLOCAL); 1058 CLR(t->c_cflag, HUPCL); 1059 } 1060 1061 /* 1062 * If there were no changes, don't do anything. This avoids dropping 1063 * input and improves performance when all we did was frob things like 1064 * VMIN and VTIME. 1065 */ 1066 if (tp->t_ospeed == t->c_ospeed && 1067 tp->t_cflag == t->c_cflag) 1068 return (0); 1069 1070 lcr = ISSET(sc->sc_lcr, LCR_SBREAK) | cflag2lcr(t->c_cflag); 1071 1072 s = splserial(); 1073 1074 sc->sc_lcr = lcr; 1075 1076 /* 1077 * If we're not in a mode that assumes a connection is present, then 1078 * ignore carrier changes. 1079 */ 1080 if (ISSET(t->c_cflag, CLOCAL | MDMBUF)) 1081 sc->sc_msr_dcd = 0; 1082 else 1083 sc->sc_msr_dcd = MSR_DCD; 1084 /* 1085 * Set the flow control pins depending on the current flow control 1086 * mode. 1087 */ 1088 if (ISSET(t->c_cflag, CRTSCTS)) { 1089 sc->sc_mcr_dtr = MCR_DTR; 1090 sc->sc_mcr_rts = MCR_RTS; 1091 sc->sc_msr_cts = MSR_CTS; 1092 sc->sc_efr = EFR_AUTORTS | EFR_AUTOCTS; 1093 } else if (ISSET(t->c_cflag, MDMBUF)) { 1094 /* 1095 * For DTR/DCD flow control, make sure we don't toggle DTR for 1096 * carrier detection. 1097 */ 1098 sc->sc_mcr_dtr = 0; 1099 sc->sc_mcr_rts = MCR_DTR; 1100 sc->sc_msr_cts = MSR_DCD; 1101 sc->sc_efr = 0; 1102 } else { 1103 /* 1104 * If no flow control, then always set RTS. This will make 1105 * the other side happy if it mistakenly thinks we're doing 1106 * RTS/CTS flow control. 1107 */ 1108 sc->sc_mcr_dtr = MCR_DTR | MCR_RTS; 1109 sc->sc_mcr_rts = 0; 1110 sc->sc_msr_cts = 0; 1111 sc->sc_efr = 0; 1112 if (ISSET(sc->sc_mcr, MCR_DTR)) 1113 SET(sc->sc_mcr, MCR_RTS); 1114 else 1115 CLR(sc->sc_mcr, MCR_RTS); 1116 } 1117 sc->sc_msr_mask = sc->sc_msr_cts | sc->sc_msr_dcd; 1118 1119 #if 0 1120 if (ospeed == 0) 1121 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 1122 else 1123 SET(sc->sc_mcr, sc->sc_mcr_dtr); 1124 #endif 1125 1126 sc->sc_dlbl = ospeed; 1127 sc->sc_dlbh = ospeed >> 8; 1128 1129 /* 1130 * Set the FIFO threshold based on the receive speed. 1131 * 1132 * * If it's a low speed, it's probably a mouse or some other 1133 * interactive device, so set the threshold low. 1134 * * If it's a high speed, trim the trigger level down to prevent 1135 * overflows. 1136 * * Otherwise set it a bit higher. 1137 */ 1138 if (ISSET(sc->sc_hwflags, COM_HW_HAYESP)) 1139 sc->sc_fifo = FIFO_DMA_MODE | FIFO_ENABLE | FIFO_TRIGGER_8; 1140 else if (ISSET(sc->sc_hwflags, COM_HW_FIFO)) 1141 sc->sc_fifo = FIFO_ENABLE | 1142 (t->c_ospeed <= 1200 ? FIFO_TRIGGER_1 : 1143 t->c_ospeed <= 38400 ? FIFO_TRIGGER_8 : FIFO_TRIGGER_4); 1144 else 1145 sc->sc_fifo = 0; 1146 1147 /* And copy to tty. */ 1148 tp->t_ispeed = 0; 1149 tp->t_ospeed = t->c_ospeed; 1150 tp->t_cflag = t->c_cflag; 1151 1152 if (!sc->sc_heldchange) { 1153 if (sc->sc_tx_busy) { 1154 sc->sc_heldtbc = sc->sc_tbc; 1155 sc->sc_tbc = 0; 1156 sc->sc_heldchange = 1; 1157 } else 1158 com_loadchannelregs(sc); 1159 } 1160 1161 if (!ISSET(t->c_cflag, CHWFLOW)) { 1162 /* Disable the high water mark. */ 1163 sc->sc_r_hiwat = 0; 1164 sc->sc_r_lowat = 0; 1165 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1166 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1167 com_schedrx(sc); 1168 } 1169 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 1170 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 1171 com_hwiflow(sc); 1172 } 1173 } else { 1174 sc->sc_r_hiwat = com_rbuf_hiwat; 1175 sc->sc_r_lowat = com_rbuf_lowat; 1176 } 1177 1178 splx(s); 1179 1180 /* 1181 * Update the tty layer's idea of the carrier bit, in case we changed 1182 * CLOCAL or MDMBUF. We don't hang up here; we only do that by 1183 * explicit request. 1184 */ 1185 (void) (*linesw[tp->t_line].l_modem)(tp, ISSET(sc->sc_msr, MSR_DCD)); 1186 1187 #ifdef COM_DEBUG 1188 if (com_debug) 1189 comstatus(sc, "comparam "); 1190 #endif 1191 1192 if (!ISSET(t->c_cflag, CHWFLOW)) { 1193 if (sc->sc_tx_stopped) { 1194 sc->sc_tx_stopped = 0; 1195 comstart(tp); 1196 } 1197 } 1198 1199 return (0); 1200 } 1201 1202 void 1203 com_iflush(sc) 1204 struct com_softc *sc; 1205 { 1206 bus_space_tag_t iot = sc->sc_iot; 1207 bus_space_handle_t ioh = sc->sc_ioh; 1208 #ifdef DIAGNOSTIC 1209 int reg; 1210 #endif 1211 int timo; 1212 1213 #ifdef DIAGNOSTIC 1214 reg = 0xffff; 1215 #endif 1216 timo = 50000; 1217 /* flush any pending I/O */ 1218 while (ISSET(bus_space_read_1(iot, ioh, com_lsr), LSR_RXRDY) 1219 && --timo) 1220 #ifdef DIAGNOSTIC 1221 reg = 1222 #else 1223 (void) 1224 #endif 1225 bus_space_read_1(iot, ioh, com_data); 1226 #ifdef DIAGNOSTIC 1227 if (!timo) 1228 printf("%s: com_iflush timeout %02x\n", sc->sc_dev.dv_xname, 1229 reg); 1230 #endif 1231 } 1232 1233 void 1234 com_loadchannelregs(sc) 1235 struct com_softc *sc; 1236 { 1237 bus_space_tag_t iot = sc->sc_iot; 1238 bus_space_handle_t ioh = sc->sc_ioh; 1239 1240 /* XXXXX necessary? */ 1241 com_iflush(sc); 1242 1243 bus_space_write_1(iot, ioh, com_ier, 0); 1244 1245 if (ISSET(sc->sc_hwflags, COM_HW_FLOW)) { 1246 bus_space_write_1(iot, ioh, com_lcr, LCR_EERS); 1247 bus_space_write_1(iot, ioh, com_efr, sc->sc_efr); 1248 } 1249 bus_space_write_1(iot, ioh, com_lcr, sc->sc_lcr | LCR_DLAB); 1250 bus_space_write_1(iot, ioh, com_dlbl, sc->sc_dlbl); 1251 bus_space_write_1(iot, ioh, com_dlbh, sc->sc_dlbh); 1252 bus_space_write_1(iot, ioh, com_lcr, sc->sc_lcr); 1253 bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr_active = sc->sc_mcr); 1254 bus_space_write_1(iot, ioh, com_fifo, sc->sc_fifo); 1255 1256 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1257 } 1258 1259 int 1260 comhwiflow(tp, block) 1261 struct tty *tp; 1262 int block; 1263 { 1264 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1265 int s; 1266 1267 if (sc->sc_mcr_rts == 0) 1268 return (0); 1269 1270 s = splserial(); 1271 if (block) { 1272 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1273 SET(sc->sc_rx_flags, RX_TTY_BLOCKED); 1274 com_hwiflow(sc); 1275 } 1276 } else { 1277 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1278 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1279 com_schedrx(sc); 1280 } 1281 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1282 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED); 1283 com_hwiflow(sc); 1284 } 1285 } 1286 splx(s); 1287 return (1); 1288 } 1289 1290 /* 1291 * (un)block input via hw flowcontrol 1292 */ 1293 void 1294 com_hwiflow(sc) 1295 struct com_softc *sc; 1296 { 1297 bus_space_tag_t iot = sc->sc_iot; 1298 bus_space_handle_t ioh = sc->sc_ioh; 1299 1300 if (sc->sc_mcr_rts == 0) 1301 return; 1302 1303 if (ISSET(sc->sc_rx_flags, RX_ANY_BLOCK)) { 1304 CLR(sc->sc_mcr, sc->sc_mcr_rts); 1305 CLR(sc->sc_mcr_active, sc->sc_mcr_rts); 1306 } else { 1307 SET(sc->sc_mcr, sc->sc_mcr_rts); 1308 SET(sc->sc_mcr_active, sc->sc_mcr_rts); 1309 } 1310 bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr_active); 1311 } 1312 1313 1314 void 1315 comstart(tp) 1316 struct tty *tp; 1317 { 1318 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1319 bus_space_tag_t iot = sc->sc_iot; 1320 bus_space_handle_t ioh = sc->sc_ioh; 1321 int s; 1322 1323 s = spltty(); 1324 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 1325 goto out; 1326 if (sc->sc_tx_stopped) 1327 goto out; 1328 1329 if (tp->t_outq.c_cc <= tp->t_lowat) { 1330 if (ISSET(tp->t_state, TS_ASLEEP)) { 1331 CLR(tp->t_state, TS_ASLEEP); 1332 wakeup(&tp->t_outq); 1333 } 1334 selwakeup(&tp->t_wsel); 1335 if (tp->t_outq.c_cc == 0) 1336 goto out; 1337 } 1338 1339 /* Grab the first contiguous region of buffer space. */ 1340 { 1341 u_char *tba; 1342 int tbc; 1343 1344 tba = tp->t_outq.c_cf; 1345 tbc = ndqb(&tp->t_outq, 0); 1346 1347 (void)splserial(); 1348 1349 sc->sc_tba = tba; 1350 sc->sc_tbc = tbc; 1351 } 1352 1353 SET(tp->t_state, TS_BUSY); 1354 sc->sc_tx_busy = 1; 1355 1356 /* Enable transmit completion interrupts if necessary. */ 1357 if (!ISSET(sc->sc_ier, IER_ETXRDY)) { 1358 SET(sc->sc_ier, IER_ETXRDY); 1359 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1360 } 1361 1362 /* Output the first chunk of the contiguous buffer. */ 1363 { 1364 int n; 1365 1366 n = sc->sc_tbc; 1367 if (n > sc->sc_fifolen) 1368 n = sc->sc_fifolen; 1369 bus_space_write_multi_1(iot, ioh, com_data, sc->sc_tba, n); 1370 sc->sc_tbc -= n; 1371 sc->sc_tba += n; 1372 } 1373 out: 1374 splx(s); 1375 return; 1376 } 1377 1378 /* 1379 * Stop output on a line. 1380 */ 1381 void 1382 comstop(tp, flag) 1383 struct tty *tp; 1384 int flag; 1385 { 1386 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1387 int s; 1388 1389 s = splserial(); 1390 if (ISSET(tp->t_state, TS_BUSY)) { 1391 /* Stop transmitting at the next chunk. */ 1392 sc->sc_tbc = 0; 1393 sc->sc_heldtbc = 0; 1394 if (!ISSET(tp->t_state, TS_TTSTOP)) 1395 SET(tp->t_state, TS_FLUSH); 1396 } 1397 splx(s); 1398 } 1399 1400 void 1401 comdiag(arg) 1402 void *arg; 1403 { 1404 struct com_softc *sc = arg; 1405 int overflows, floods; 1406 int s; 1407 1408 s = splserial(); 1409 overflows = sc->sc_overflows; 1410 sc->sc_overflows = 0; 1411 floods = sc->sc_floods; 1412 sc->sc_floods = 0; 1413 sc->sc_errors = 0; 1414 splx(s); 1415 1416 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1417 sc->sc_dev.dv_xname, 1418 overflows, overflows == 1 ? "" : "s", 1419 floods, floods == 1 ? "" : "s"); 1420 } 1421 1422 integrate void 1423 com_rxsoft(sc, tp) 1424 struct com_softc *sc; 1425 struct tty *tp; 1426 { 1427 int (*rint) __P((int c, struct tty *tp)) = linesw[tp->t_line].l_rint; 1428 u_char *get, *end; 1429 u_int cc, scc; 1430 u_char lsr; 1431 int code; 1432 int s; 1433 1434 end = sc->sc_ebuf; 1435 get = sc->sc_rbget; 1436 scc = cc = com_rbuf_size - sc->sc_rbavail; 1437 1438 if (cc == com_rbuf_size) { 1439 sc->sc_floods++; 1440 if (sc->sc_errors++ == 0) 1441 timeout(comdiag, sc, 60 * hz); 1442 } 1443 1444 while (cc) { 1445 code = get[0]; 1446 lsr = get[1]; 1447 if (ISSET(lsr, LSR_OE | LSR_BI | LSR_FE | LSR_PE)) { 1448 if (ISSET(lsr, LSR_OE)) { 1449 sc->sc_overflows++; 1450 if (sc->sc_errors++ == 0) 1451 timeout(comdiag, sc, 60 * hz); 1452 } 1453 if (ISSET(lsr, LSR_BI | LSR_FE)) 1454 SET(code, TTY_FE); 1455 if (ISSET(lsr, LSR_PE)) 1456 SET(code, TTY_PE); 1457 } 1458 if ((*rint)(code, tp) == -1) { 1459 /* 1460 * The line discipline's buffer is out of space. 1461 */ 1462 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1463 /* 1464 * We're either not using flow control, or the 1465 * line discipline didn't tell us to block for 1466 * some reason. Either way, we have no way to 1467 * know when there's more space available, so 1468 * just drop the rest of the data. 1469 */ 1470 get += cc << 1; 1471 if (get >= end) 1472 get -= com_rbuf_size << 1; 1473 cc = 0; 1474 } else { 1475 /* 1476 * Don't schedule any more receive processing 1477 * until the line discipline tells us there's 1478 * space available (through comhwiflow()). 1479 * Leave the rest of the data in the input 1480 * buffer. 1481 */ 1482 SET(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1483 } 1484 break; 1485 } 1486 get += 2; 1487 if (get >= end) 1488 get = sc->sc_rbuf; 1489 cc--; 1490 } 1491 1492 if (cc != scc) { 1493 sc->sc_rbget = get; 1494 s = splserial(); 1495 cc = sc->sc_rbavail += scc - cc; 1496 /* Buffers should be ok again, release possible block. */ 1497 if (cc >= sc->sc_r_lowat) { 1498 if (ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1499 CLR(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1500 SET(sc->sc_ier, IER_ERXRDY); 1501 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 1502 } 1503 if (ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED)) { 1504 CLR(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1505 com_hwiflow(sc); 1506 } 1507 } 1508 splx(s); 1509 } 1510 } 1511 1512 integrate void 1513 com_txsoft(sc, tp) 1514 struct com_softc *sc; 1515 struct tty *tp; 1516 { 1517 1518 CLR(tp->t_state, TS_BUSY); 1519 if (ISSET(tp->t_state, TS_FLUSH)) 1520 CLR(tp->t_state, TS_FLUSH); 1521 else 1522 ndflush(&tp->t_outq, (int)(sc->sc_tba - tp->t_outq.c_cf)); 1523 (*linesw[tp->t_line].l_start)(tp); 1524 } 1525 1526 integrate void 1527 com_stsoft(sc, tp) 1528 struct com_softc *sc; 1529 struct tty *tp; 1530 { 1531 u_char msr, delta; 1532 int s; 1533 1534 s = splserial(); 1535 msr = sc->sc_msr; 1536 delta = sc->sc_msr_delta; 1537 sc->sc_msr_delta = 0; 1538 splx(s); 1539 1540 if (ISSET(delta, sc->sc_msr_dcd)) { 1541 /* 1542 * Inform the tty layer that carrier detect changed. 1543 */ 1544 (void) (*linesw[tp->t_line].l_modem)(tp, ISSET(msr, MSR_DCD)); 1545 } 1546 1547 if (ISSET(delta, sc->sc_msr_cts)) { 1548 /* Block or unblock output according to flow control. */ 1549 if (ISSET(msr, sc->sc_msr_cts)) { 1550 sc->sc_tx_stopped = 0; 1551 (*linesw[tp->t_line].l_start)(tp); 1552 } else { 1553 sc->sc_tx_stopped = 1; 1554 } 1555 } 1556 1557 #ifdef COM_DEBUG 1558 if (com_debug) 1559 comstatus(sc, "com_stsoft"); 1560 #endif 1561 } 1562 1563 #ifdef __GENERIC_SOFT_INTERRUPTS 1564 void 1565 comsoft(arg) 1566 void *arg; 1567 { 1568 struct com_softc *sc = arg; 1569 struct tty *tp; 1570 1571 if (!sc->enabled) 1572 return; 1573 1574 { 1575 #else 1576 void 1577 #ifndef __NO_SOFT_SERIAL_INTERRUPT 1578 comsoft() 1579 #else 1580 comsoft(arg) 1581 void *arg; 1582 #endif 1583 { 1584 struct com_softc *sc; 1585 struct tty *tp; 1586 int unit; 1587 #ifdef __NO_SOFT_SERIAL_INTERRUPT 1588 int s; 1589 1590 s = splsoftserial(); 1591 com_softintr_scheduled = 0; 1592 #endif 1593 1594 for (unit = 0; unit < com_cd.cd_ndevs; unit++) { 1595 sc = com_cd.cd_devs[unit]; 1596 if (sc == NULL || !ISSET(sc->sc_hwflags, COM_HW_DEV_OK)) 1597 continue; 1598 1599 if (!sc->enabled) 1600 continue; 1601 1602 tp = sc->sc_tty; 1603 if (tp == NULL || !ISSET(tp->t_state, TS_ISOPEN | TS_WOPEN)) 1604 continue; 1605 #endif 1606 tp = sc->sc_tty; 1607 1608 if (sc->sc_rx_ready) { 1609 sc->sc_rx_ready = 0; 1610 com_rxsoft(sc, tp); 1611 } 1612 1613 if (sc->sc_st_check) { 1614 sc->sc_st_check = 0; 1615 com_stsoft(sc, tp); 1616 } 1617 1618 if (sc->sc_tx_done) { 1619 sc->sc_tx_done = 0; 1620 com_txsoft(sc, tp); 1621 } 1622 } 1623 1624 #ifndef __GENERIC_SOFT_INTERRUPTS 1625 #ifdef __NO_SOFT_SERIAL_INTERRUPT 1626 splx(s); 1627 #endif 1628 #endif 1629 } 1630 1631 int 1632 comintr(arg) 1633 void *arg; 1634 { 1635 struct com_softc *sc = arg; 1636 bus_space_tag_t iot = sc->sc_iot; 1637 bus_space_handle_t ioh = sc->sc_ioh; 1638 u_char *put, *end; 1639 u_int cc; 1640 u_char lsr, iir; 1641 1642 if (!sc->enabled) 1643 return (0); 1644 1645 iir = bus_space_read_1(iot, ioh, com_iir); 1646 if (ISSET(iir, IIR_NOPEND)) 1647 return (0); 1648 1649 end = sc->sc_ebuf; 1650 put = sc->sc_rbput; 1651 cc = sc->sc_rbavail; 1652 1653 do { 1654 u_char msr, delta; 1655 1656 lsr = bus_space_read_1(iot, ioh, com_lsr); 1657 #if defined(DDB) || defined(KGDB) 1658 if (ISSET(lsr, LSR_BI)) { 1659 #ifdef DDB 1660 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 1661 Debugger(); 1662 continue; 1663 } 1664 #endif 1665 #ifdef KGDB 1666 if (ISSET(sc->sc_hwflags, COM_HW_KGDB)) { 1667 kgdb_connect(1); 1668 continue; 1669 } 1670 #endif 1671 } 1672 #endif /* DDB || KGDB */ 1673 1674 if (ISSET(lsr, LSR_RCV_MASK) && 1675 !ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1676 while (cc > 0) { 1677 put[0] = bus_space_read_1(iot, ioh, com_data); 1678 put[1] = lsr; 1679 put += 2; 1680 if (put >= end) 1681 put = sc->sc_rbuf; 1682 cc--; 1683 1684 lsr = bus_space_read_1(iot, ioh, com_lsr); 1685 if (!ISSET(lsr, LSR_RCV_MASK)) 1686 break; 1687 } 1688 1689 /* 1690 * Current string of incoming characters ended because 1691 * no more data was available or we ran out of space. 1692 * Schedule a receive event if any data was received. 1693 * If we're out of space, turn off receive interrupts. 1694 */ 1695 sc->sc_rbput = put; 1696 sc->sc_rbavail = cc; 1697 if (!ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) 1698 sc->sc_rx_ready = 1; 1699 1700 /* 1701 * See if we are in danger of overflowing a buffer. If 1702 * so, use hardware flow control to ease the pressure. 1703 */ 1704 if (!ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED) && 1705 cc < sc->sc_r_hiwat) { 1706 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1707 com_hwiflow(sc); 1708 } 1709 1710 /* 1711 * If we're out of space, disable receive interrupts 1712 * until the queue has drained a bit. 1713 */ 1714 if (!cc) { 1715 SET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1716 CLR(sc->sc_ier, IER_ERXRDY); 1717 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1718 } 1719 } else { 1720 if ((iir & IIR_IMASK) == IIR_RXRDY) { 1721 bus_space_write_1(iot, ioh, com_ier, 0); 1722 delay(10); 1723 bus_space_write_1(iot, ioh, com_ier,sc->sc_ier); 1724 iir = IIR_NOPEND; 1725 continue; 1726 } 1727 } 1728 1729 msr = bus_space_read_1(iot, ioh, com_msr); 1730 delta = msr ^ sc->sc_msr; 1731 sc->sc_msr = msr; 1732 if (ISSET(delta, sc->sc_msr_mask)) { 1733 SET(sc->sc_msr_delta, delta); 1734 1735 /* 1736 * Stop output immediately if we lose the output 1737 * flow control signal or carrier detect. 1738 */ 1739 if (ISSET(~msr, sc->sc_msr_mask)) { 1740 sc->sc_tbc = 0; 1741 sc->sc_heldtbc = 0; 1742 #ifdef COM_DEBUG 1743 if (com_debug) 1744 comstatus(sc, "comintr "); 1745 #endif 1746 } 1747 1748 sc->sc_st_check = 1; 1749 } 1750 } while (!ISSET((iir = bus_space_read_1(iot, ioh, com_iir)), IIR_NOPEND)); 1751 1752 /* 1753 * Done handling any receive interrupts. See if data can be 1754 * transmitted as well. Schedule tx done event if no data left 1755 * and tty was marked busy. 1756 */ 1757 if (ISSET(lsr, LSR_TXRDY)) { 1758 /* 1759 * If we've delayed a parameter change, do it now, and restart 1760 * output. 1761 */ 1762 if (sc->sc_heldchange) { 1763 com_loadchannelregs(sc); 1764 sc->sc_heldchange = 0; 1765 sc->sc_tbc = sc->sc_heldtbc; 1766 sc->sc_heldtbc = 0; 1767 } 1768 1769 /* Output the next chunk of the contiguous buffer, if any. */ 1770 if (sc->sc_tbc > 0) { 1771 int n; 1772 1773 n = sc->sc_tbc; 1774 if (n > sc->sc_fifolen) 1775 n = sc->sc_fifolen; 1776 bus_space_write_multi_1(iot, ioh, com_data, sc->sc_tba, n); 1777 sc->sc_tbc -= n; 1778 sc->sc_tba += n; 1779 } else { 1780 /* Disable transmit completion interrupts if necessary. */ 1781 if (ISSET(sc->sc_ier, IER_ETXRDY)) { 1782 CLR(sc->sc_ier, IER_ETXRDY); 1783 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1784 } 1785 if (sc->sc_tx_busy) { 1786 sc->sc_tx_busy = 0; 1787 sc->sc_tx_done = 1; 1788 } 1789 } 1790 } 1791 1792 /* Wake up the poller. */ 1793 #ifdef __GENERIC_SOFT_INTERRUPTS 1794 softintr_schedule(sc->sc_si); 1795 #else 1796 #ifndef __NO_SOFT_SERIAL_INTERRUPT 1797 setsoftserial(); 1798 #else 1799 if (!com_softintr_scheduled) { 1800 com_softintr_scheduled = 1; 1801 timeout(comsoft, NULL, 1); 1802 } 1803 #endif 1804 #endif 1805 1806 #if NRND > 0 && defined(RND_COM) 1807 rnd_add_uint32(&sc->rnd_source, iir | lsr); 1808 #endif 1809 1810 return (1); 1811 } 1812 1813 /* 1814 * The following functions are polled getc and putc routines, shared 1815 * by the console and kgdb glue. 1816 */ 1817 1818 int 1819 com_common_getc(iot, ioh) 1820 bus_space_tag_t iot; 1821 bus_space_handle_t ioh; 1822 { 1823 int s = splserial(); 1824 u_char stat, c; 1825 1826 /* block until a character becomes available */ 1827 while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_RXRDY)) 1828 ; 1829 1830 c = bus_space_read_1(iot, ioh, com_data); 1831 stat = bus_space_read_1(iot, ioh, com_iir); 1832 splx(s); 1833 return (c); 1834 } 1835 1836 void 1837 com_common_putc(iot, ioh, c) 1838 bus_space_tag_t iot; 1839 bus_space_handle_t ioh; 1840 int c; 1841 { 1842 int s = splserial(); 1843 u_char stat; 1844 int timo; 1845 1846 /* wait for any pending transmission to finish */ 1847 timo = 50000; 1848 while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_TXRDY) 1849 && --timo) 1850 ; 1851 1852 bus_space_write_1(iot, ioh, com_data, c); 1853 /* wait for this transmission to complete */ 1854 timo = 1500000; 1855 while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_TXRDY) 1856 && --timo) 1857 ; 1858 1859 /* clear any interrupts generated by this transmission */ 1860 stat = bus_space_read_1(iot, ioh, com_iir); 1861 splx(s); 1862 } 1863 1864 /* 1865 * Initialize UART to known state. 1866 */ 1867 int 1868 cominit(iot, iobase, rate, frequency, cflag, iohp) 1869 bus_space_tag_t iot; 1870 int iobase; 1871 int rate, frequency; 1872 tcflag_t cflag; 1873 bus_space_handle_t *iohp; 1874 { 1875 bus_space_handle_t ioh; 1876 1877 if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) 1878 return (ENOMEM); /* ??? */ 1879 1880 bus_space_write_1(iot, ioh, com_lcr, LCR_EERS); 1881 bus_space_write_1(iot, ioh, com_efr, 0); 1882 bus_space_write_1(iot, ioh, com_lcr, LCR_DLAB); 1883 rate = comspeed(rate, frequency); 1884 bus_space_write_1(iot, ioh, com_dlbl, rate); 1885 bus_space_write_1(iot, ioh, com_dlbh, rate >> 8); 1886 bus_space_write_1(iot, ioh, com_lcr, cflag2lcr(cflag)); 1887 bus_space_write_1(iot, ioh, com_mcr, 0); 1888 bus_space_write_1(iot, ioh, com_fifo, 1889 FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_1); 1890 bus_space_write_1(iot, ioh, com_ier, 0); 1891 1892 *iohp = ioh; 1893 return (0); 1894 } 1895 1896 /* 1897 * Following are all routines needed for COM to act as console 1898 */ 1899 1900 int 1901 comcnattach(iot, iobase, rate, frequency, cflag) 1902 bus_space_tag_t iot; 1903 int iobase; 1904 int rate, frequency; 1905 tcflag_t cflag; 1906 { 1907 int res; 1908 static struct consdev comcons = { 1909 NULL, NULL, comcngetc, comcnputc, comcnpollc, NODEV, CN_NORMAL 1910 }; 1911 1912 res = cominit(iot, iobase, rate, frequency, cflag, &comconsioh); 1913 if (res) 1914 return (res); 1915 1916 cn_tab = &comcons; 1917 1918 comconstag = iot; 1919 comconsaddr = iobase; 1920 comconsrate = rate; 1921 comconscflag = cflag; 1922 1923 return (0); 1924 } 1925 1926 int 1927 comcngetc(dev) 1928 dev_t dev; 1929 { 1930 1931 return (com_common_getc(comconstag, comconsioh)); 1932 } 1933 1934 /* 1935 * Console kernel output character routine. 1936 */ 1937 void 1938 comcnputc(dev, c) 1939 dev_t dev; 1940 int c; 1941 { 1942 1943 com_common_putc(comconstag, comconsioh, c); 1944 } 1945 1946 void 1947 comcnpollc(dev, on) 1948 dev_t dev; 1949 int on; 1950 { 1951 1952 } 1953 1954 #ifdef KGDB 1955 int 1956 com_kgdb_attach(iot, iobase, rate, frequency, cflag) 1957 bus_space_tag_t iot; 1958 int iobase; 1959 int rate, frequency; 1960 tcflag_t cflag; 1961 { 1962 int res; 1963 1964 if (iot == comconstag && iobase == comconsaddr) 1965 return (EBUSY); /* cannot share with console */ 1966 1967 res = cominit(iot, iobase, rate, frequency, cflag, &com_kgdb_ioh); 1968 if (res) 1969 return (res); 1970 1971 kgdb_attach(com_kgdb_getc, com_kgdb_putc, NULL); 1972 kgdb_dev = 123; /* unneeded, only to satisfy some tests */ 1973 1974 com_kgdb_iot = iot; 1975 com_kgdb_addr = iobase; 1976 1977 return (0); 1978 } 1979 1980 /* ARGSUSED */ 1981 int 1982 com_kgdb_getc(arg) 1983 void *arg; 1984 { 1985 1986 return (com_common_getc(com_kgdb_iot, com_kgdb_ioh)); 1987 } 1988 1989 /* ARGSUSED */ 1990 void 1991 com_kgdb_putc(arg, c) 1992 void *arg; 1993 int c; 1994 { 1995 1996 return (com_common_putc(com_kgdb_iot, com_kgdb_ioh, c)); 1997 } 1998 #endif /* KGDB */ 1999 2000 /* helper function to identify the com ports used by 2001 console or KGDB (and not yet autoconf attached) */ 2002 int 2003 com_is_console(iot, iobase, ioh) 2004 bus_space_tag_t iot; 2005 int iobase; 2006 bus_space_handle_t *ioh; 2007 { 2008 bus_space_handle_t help; 2009 2010 if (!comconsattached && 2011 iot == comconstag && iobase == comconsaddr) 2012 help = comconsioh; 2013 #ifdef KGDB 2014 else if (!com_kgdb_attached && 2015 iot == com_kgdb_iot && iobase == com_kgdb_addr) 2016 help = com_kgdb_ioh; 2017 #endif 2018 else 2019 return (0); 2020 2021 if (ioh) 2022 *ioh = help; 2023 return (1); 2024 } 2025
Indexes created Tue Sep 23 13:09:54 GMT 2025