com.c revision 1.132
1 /* $NetBSD: com.c,v 1.132 1998/02/02 22:54:55 cgd 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 alpha 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 alpha 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 printf("%s: device enable failed\n", 631 sc->sc_dev.dv_xname); 632 return (EIO); 633 } 634 sc->enabled = 1; 635 com_config(sc); 636 } 637 638 /* Turn on interrupts. */ 639 sc->sc_ier = IER_ERXRDY | IER_ERLS | IER_EMSC; 640 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 641 642 /* Fetch the current modem control status, needed later. */ 643 sc->sc_msr = bus_space_read_1(sc->sc_iot, sc->sc_ioh, com_msr); 644 645 splx(s2); 646 647 /* 648 * Initialize the termios status to the defaults. Add in the 649 * sticky bits from TIOCSFLAGS. 650 */ 651 t.c_ispeed = 0; 652 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 653 t.c_ospeed = comconsrate; 654 t.c_cflag = comconscflag; 655 } else { 656 t.c_ospeed = TTYDEF_SPEED; 657 t.c_cflag = TTYDEF_CFLAG; 658 } 659 if (ISSET(sc->sc_swflags, TIOCFLAG_CLOCAL)) 660 SET(t.c_cflag, CLOCAL); 661 if (ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS)) 662 SET(t.c_cflag, CRTSCTS); 663 if (ISSET(sc->sc_swflags, TIOCFLAG_MDMBUF)) 664 SET(t.c_cflag, MDMBUF); 665 /* Make sure comparam() will do something. */ 666 tp->t_ospeed = 0; 667 (void) comparam(tp, &t); 668 tp->t_iflag = TTYDEF_IFLAG; 669 tp->t_oflag = TTYDEF_OFLAG; 670 tp->t_lflag = TTYDEF_LFLAG; 671 ttychars(tp); 672 ttsetwater(tp); 673 674 /* 675 * Turn on DTR. We must always do this, even if carrier is not 676 * present, because otherwise we'd have to use TIOCSDTR 677 * immediately after setting CLOCAL, which applications do not 678 * expect. We always assert DTR while the device is open 679 * unless explicitly requested to deassert it. 680 */ 681 com_modem(sc, 1); 682 683 s2 = splserial(); 684 685 /* Clear the input ring, and unblock. */ 686 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 687 sc->sc_rbavail = com_rbuf_size; 688 com_iflush(sc); 689 CLR(sc->sc_rx_flags, RX_ANY_BLOCK); 690 com_hwiflow(sc); 691 692 #ifdef COM_DEBUG 693 if (com_debug) 694 comstatus(sc, "comopen "); 695 #endif 696 697 splx(s2); 698 } 699 error = 0; 700 701 /* If we're doing a blocking open... */ 702 if (!ISSET(flag, O_NONBLOCK)) 703 /* ...then wait for carrier. */ 704 while (!ISSET(tp->t_state, TS_CARR_ON) && 705 !ISSET(tp->t_cflag, CLOCAL | MDMBUF)) { 706 error = ttysleep(tp, &tp->t_rawq, TTIPRI | PCATCH, 707 ttopen, 0); 708 if (error) { 709 /* 710 * If the open was interrupted and nobody 711 * else has the device open, then hang up. 712 */ 713 if (!ISSET(tp->t_state, TS_ISOPEN)) { 714 com_modem(sc, 0); 715 CLR(tp->t_state, TS_WOPEN); 716 ttwakeup(tp); 717 } 718 break; 719 } 720 SET(tp->t_state, TS_WOPEN); 721 } 722 723 splx(s); 724 if (error == 0) 725 error = (*linesw[tp->t_line].l_open)(dev, tp); 726 return (error); 727 } 728 729 int 730 comclose(dev, flag, mode, p) 731 dev_t dev; 732 int flag, mode; 733 struct proc *p; 734 { 735 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 736 struct tty *tp = sc->sc_tty; 737 int s; 738 739 /* XXX This is for cons.c. */ 740 if (!ISSET(tp->t_state, TS_ISOPEN)) 741 return (0); 742 743 (*linesw[tp->t_line].l_close)(tp, flag); 744 ttyclose(tp); 745 746 s = splserial(); 747 748 /* If we were asserting flow control, then deassert it. */ 749 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 750 com_hwiflow(sc); 751 752 splx(s); 753 754 /* Clear any break condition set with TIOCSBRK. */ 755 com_break(sc, 0); 756 757 /* 758 * Hang up if necessary. Wait a bit, so the other side has time to 759 * notice even if we immediately open the port again. 760 */ 761 if (ISSET(tp->t_cflag, HUPCL)) { 762 com_modem(sc, 0); 763 (void) tsleep(sc, TTIPRI, ttclos, hz); 764 } 765 766 s = splserial(); 767 768 /* Turn off interrupts. */ 769 #ifdef DDB 770 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) 771 sc->sc_ier = IER_ERXRDY; /* interrupt on break */ 772 else 773 #endif 774 sc->sc_ier = 0; 775 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 776 777 if (sc->disable) { 778 if (sc->enabled) { 779 (*sc->disable)(sc); 780 sc->enabled = 0; 781 } 782 } 783 784 splx(s); 785 786 return (0); 787 } 788 789 int 790 comread(dev, uio, flag) 791 dev_t dev; 792 struct uio *uio; 793 int flag; 794 { 795 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 796 struct tty *tp = sc->sc_tty; 797 798 return ((*linesw[tp->t_line].l_read)(tp, uio, flag)); 799 } 800 801 int 802 comwrite(dev, uio, flag) 803 dev_t dev; 804 struct uio *uio; 805 int flag; 806 { 807 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 808 struct tty *tp = sc->sc_tty; 809 810 return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 811 } 812 813 struct tty * 814 comtty(dev) 815 dev_t dev; 816 { 817 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 818 struct tty *tp = sc->sc_tty; 819 820 return (tp); 821 } 822 823 static u_char 824 tiocm_xxx2mcr(data) 825 int data; 826 { 827 u_char m = 0; 828 829 if (ISSET(data, TIOCM_DTR)) 830 SET(m, MCR_DTR); 831 if (ISSET(data, TIOCM_RTS)) 832 SET(m, MCR_RTS); 833 return m; 834 } 835 836 int 837 comioctl(dev, cmd, data, flag, p) 838 dev_t dev; 839 u_long cmd; 840 caddr_t data; 841 int flag; 842 struct proc *p; 843 { 844 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 845 struct tty *tp = sc->sc_tty; 846 int error; 847 848 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); 849 if (error >= 0) 850 return (error); 851 852 error = ttioctl(tp, cmd, data, flag, p); 853 if (error >= 0) 854 return (error); 855 856 switch (cmd) { 857 case TIOCSBRK: 858 com_break(sc, 1); 859 break; 860 861 case TIOCCBRK: 862 com_break(sc, 0); 863 break; 864 865 case TIOCSDTR: 866 com_modem(sc, 1); 867 break; 868 869 case TIOCCDTR: 870 com_modem(sc, 0); 871 break; 872 873 case TIOCGFLAGS: 874 *(int *)data = sc->sc_swflags; 875 break; 876 877 case TIOCSFLAGS: 878 error = suser(p->p_ucred, &p->p_acflag); 879 if (error) 880 return (error); 881 sc->sc_swflags = *(int *)data; 882 break; 883 884 case TIOCMSET: 885 CLR(sc->sc_mcr, MCR_DTR | MCR_RTS); 886 /*FALLTHROUGH*/ 887 888 case TIOCMBIS: 889 SET(sc->sc_mcr, tiocm_xxx2mcr(*(int *)data)); 890 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_mcr, sc->sc_mcr); 891 break; 892 893 case TIOCMBIC: 894 CLR(sc->sc_mcr, tiocm_xxx2mcr(*(int *)data)); 895 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_mcr, sc->sc_mcr); 896 break; 897 898 case TIOCMGET: { 899 u_char m; 900 int bits = 0; 901 902 m = sc->sc_mcr; 903 if (ISSET(m, MCR_DTR)) 904 SET(bits, TIOCM_DTR); 905 if (ISSET(m, MCR_RTS)) 906 SET(bits, TIOCM_RTS); 907 m = sc->sc_msr; 908 if (ISSET(m, MSR_DCD)) 909 SET(bits, TIOCM_CD); 910 if (ISSET(m, MSR_CTS)) 911 SET(bits, TIOCM_CTS); 912 if (ISSET(m, MSR_DSR)) 913 SET(bits, TIOCM_DSR); 914 if (ISSET(m, MSR_RI | MSR_TERI)) 915 SET(bits, TIOCM_RI); 916 if (bus_space_read_1(sc->sc_iot, sc->sc_ioh, com_ier)) 917 SET(bits, TIOCM_LE); 918 *(int *)data = bits; 919 break; 920 } 921 default: 922 return (ENOTTY); 923 } 924 925 #ifdef COM_DEBUG 926 if (com_debug) 927 comstatus(sc, "comioctl "); 928 #endif 929 930 return (0); 931 } 932 933 integrate void 934 com_schedrx(sc) 935 struct com_softc *sc; 936 { 937 938 sc->sc_rx_ready = 1; 939 940 /* Wake up the poller. */ 941 #ifdef __GENERIC_SOFT_INTERRUPTS 942 softintr_schedule(sc->sc_si); 943 #else 944 #ifndef alpha 945 setsoftserial(); 946 #else 947 if (!com_softintr_scheduled) { 948 com_softintr_scheduled = 1; 949 timeout(comsoft, NULL, 1); 950 } 951 #endif 952 #endif 953 } 954 955 void 956 com_break(sc, onoff) 957 struct com_softc *sc; 958 int onoff; 959 { 960 int s; 961 962 s = splserial(); 963 if (onoff) 964 SET(sc->sc_lcr, LCR_SBREAK); 965 else 966 CLR(sc->sc_lcr, LCR_SBREAK); 967 968 if (!sc->sc_heldchange) { 969 if (sc->sc_tx_busy) { 970 sc->sc_heldtbc = sc->sc_tbc; 971 sc->sc_tbc = 0; 972 sc->sc_heldchange = 1; 973 } else 974 com_loadchannelregs(sc); 975 } 976 splx(s); 977 } 978 979 void 980 com_modem(sc, onoff) 981 struct com_softc *sc; 982 int onoff; 983 { 984 int s; 985 986 s = splserial(); 987 if (onoff) 988 SET(sc->sc_mcr, sc->sc_mcr_dtr); 989 else 990 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 991 992 if (!sc->sc_heldchange) { 993 if (sc->sc_tx_busy) { 994 sc->sc_heldtbc = sc->sc_tbc; 995 sc->sc_tbc = 0; 996 sc->sc_heldchange = 1; 997 } else 998 com_loadchannelregs(sc); 999 } 1000 splx(s); 1001 } 1002 1003 static u_char 1004 cflag2lcr(cflag) 1005 tcflag_t cflag; 1006 { 1007 u_char lcr = 0; 1008 1009 switch (ISSET(cflag, CSIZE)) { 1010 case CS5: 1011 SET(lcr, LCR_5BITS); 1012 break; 1013 case CS6: 1014 SET(lcr, LCR_6BITS); 1015 break; 1016 case CS7: 1017 SET(lcr, LCR_7BITS); 1018 break; 1019 case CS8: 1020 SET(lcr, LCR_8BITS); 1021 break; 1022 } 1023 if (ISSET(cflag, PARENB)) { 1024 SET(lcr, LCR_PENAB); 1025 if (!ISSET(cflag, PARODD)) 1026 SET(lcr, LCR_PEVEN); 1027 } 1028 if (ISSET(cflag, CSTOPB)) 1029 SET(lcr, LCR_STOPB); 1030 1031 return (lcr); 1032 } 1033 1034 int 1035 comparam(tp, t) 1036 struct tty *tp; 1037 struct termios *t; 1038 { 1039 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1040 int ospeed = comspeed(t->c_ospeed, sc->sc_frequency); 1041 u_char lcr; 1042 int s; 1043 1044 /* Check requested parameters. */ 1045 if (ospeed < 0) 1046 return (EINVAL); 1047 if (t->c_ispeed && t->c_ispeed != t->c_ospeed) 1048 return (EINVAL); 1049 1050 /* 1051 * For the console, always force CLOCAL and !HUPCL, so that the port 1052 * is always active. 1053 */ 1054 if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) || 1055 ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 1056 SET(t->c_cflag, CLOCAL); 1057 CLR(t->c_cflag, HUPCL); 1058 } 1059 1060 /* 1061 * If there were no changes, don't do anything. This avoids dropping 1062 * input and improves performance when all we did was frob things like 1063 * VMIN and VTIME. 1064 */ 1065 if (tp->t_ospeed == t->c_ospeed && 1066 tp->t_cflag == t->c_cflag) 1067 return (0); 1068 1069 lcr = ISSET(sc->sc_lcr, LCR_SBREAK) | cflag2lcr(t->c_cflag); 1070 1071 s = splserial(); 1072 1073 sc->sc_lcr = lcr; 1074 1075 /* 1076 * If we're not in a mode that assumes a connection is present, then 1077 * ignore carrier changes. 1078 */ 1079 if (ISSET(t->c_cflag, CLOCAL | MDMBUF)) 1080 sc->sc_msr_dcd = 0; 1081 else 1082 sc->sc_msr_dcd = MSR_DCD; 1083 /* 1084 * Set the flow control pins depending on the current flow control 1085 * mode. 1086 */ 1087 if (ISSET(t->c_cflag, CRTSCTS)) { 1088 sc->sc_mcr_dtr = MCR_DTR; 1089 sc->sc_mcr_rts = MCR_RTS; 1090 sc->sc_msr_cts = MSR_CTS; 1091 sc->sc_efr = EFR_AUTORTS | EFR_AUTOCTS; 1092 } else if (ISSET(t->c_cflag, MDMBUF)) { 1093 /* 1094 * For DTR/DCD flow control, make sure we don't toggle DTR for 1095 * carrier detection. 1096 */ 1097 sc->sc_mcr_dtr = 0; 1098 sc->sc_mcr_rts = MCR_DTR; 1099 sc->sc_msr_cts = MSR_DCD; 1100 sc->sc_efr = 0; 1101 } else { 1102 /* 1103 * If no flow control, then always set RTS. This will make 1104 * the other side happy if it mistakenly thinks we're doing 1105 * RTS/CTS flow control. 1106 */ 1107 sc->sc_mcr_dtr = MCR_DTR | MCR_RTS; 1108 sc->sc_mcr_rts = 0; 1109 sc->sc_msr_cts = 0; 1110 sc->sc_efr = 0; 1111 if (ISSET(sc->sc_mcr, MCR_DTR)) 1112 SET(sc->sc_mcr, MCR_RTS); 1113 else 1114 CLR(sc->sc_mcr, MCR_RTS); 1115 } 1116 sc->sc_msr_mask = sc->sc_msr_cts | sc->sc_msr_dcd; 1117 1118 #if 0 1119 if (ospeed == 0) 1120 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 1121 else 1122 SET(sc->sc_mcr, sc->sc_mcr_dtr); 1123 #endif 1124 1125 sc->sc_dlbl = ospeed; 1126 sc->sc_dlbh = ospeed >> 8; 1127 1128 /* 1129 * Set the FIFO threshold based on the receive speed. 1130 * 1131 * * If it's a low speed, it's probably a mouse or some other 1132 * interactive device, so set the threshold low. 1133 * * If it's a high speed, trim the trigger level down to prevent 1134 * overflows. 1135 * * Otherwise set it a bit higher. 1136 */ 1137 if (ISSET(sc->sc_hwflags, COM_HW_HAYESP)) 1138 sc->sc_fifo = FIFO_DMA_MODE | FIFO_ENABLE | FIFO_TRIGGER_8; 1139 else if (ISSET(sc->sc_hwflags, COM_HW_FIFO)) 1140 sc->sc_fifo = FIFO_ENABLE | 1141 (t->c_ospeed <= 1200 ? FIFO_TRIGGER_1 : 1142 t->c_ospeed <= 38400 ? FIFO_TRIGGER_8 : FIFO_TRIGGER_4); 1143 else 1144 sc->sc_fifo = 0; 1145 1146 /* And copy to tty. */ 1147 tp->t_ispeed = 0; 1148 tp->t_ospeed = t->c_ospeed; 1149 tp->t_cflag = t->c_cflag; 1150 1151 if (!sc->sc_heldchange) { 1152 if (sc->sc_tx_busy) { 1153 sc->sc_heldtbc = sc->sc_tbc; 1154 sc->sc_tbc = 0; 1155 sc->sc_heldchange = 1; 1156 } else 1157 com_loadchannelregs(sc); 1158 } 1159 1160 if (!ISSET(t->c_cflag, CHWFLOW)) { 1161 /* Disable the high water mark. */ 1162 sc->sc_r_hiwat = 0; 1163 sc->sc_r_lowat = 0; 1164 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1165 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1166 com_schedrx(sc); 1167 } 1168 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 1169 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 1170 com_hwiflow(sc); 1171 } 1172 } else { 1173 sc->sc_r_hiwat = com_rbuf_hiwat; 1174 sc->sc_r_lowat = com_rbuf_lowat; 1175 } 1176 1177 splx(s); 1178 1179 /* 1180 * Update the tty layer's idea of the carrier bit, in case we changed 1181 * CLOCAL or MDMBUF. We don't hang up here; we only do that by 1182 * explicit request. 1183 */ 1184 (void) (*linesw[tp->t_line].l_modem)(tp, ISSET(sc->sc_msr, MSR_DCD)); 1185 1186 #ifdef COM_DEBUG 1187 if (com_debug) 1188 comstatus(sc, "comparam "); 1189 #endif 1190 1191 if (!ISSET(t->c_cflag, CHWFLOW)) { 1192 if (sc->sc_tx_stopped) { 1193 sc->sc_tx_stopped = 0; 1194 comstart(tp); 1195 } 1196 } 1197 1198 return (0); 1199 } 1200 1201 void 1202 com_iflush(sc) 1203 struct com_softc *sc; 1204 { 1205 bus_space_tag_t iot = sc->sc_iot; 1206 bus_space_handle_t ioh = sc->sc_ioh; 1207 #ifdef DIAGNOSTIC 1208 int reg; 1209 #endif 1210 int timo; 1211 1212 #ifdef DIAGNOSTIC 1213 reg = 0xffff; 1214 #endif 1215 timo = 50000; 1216 /* flush any pending I/O */ 1217 while (ISSET(bus_space_read_1(iot, ioh, com_lsr), LSR_RXRDY) 1218 && --timo) 1219 #ifdef DIAGNOSTIC 1220 reg = 1221 #else 1222 (void) 1223 #endif 1224 bus_space_read_1(iot, ioh, com_data); 1225 #ifdef DIAGNOSTIC 1226 if (!timo) 1227 printf("%s: com_iflush timeout %02x\n", sc->sc_dev.dv_xname, 1228 reg); 1229 #endif 1230 } 1231 1232 void 1233 com_loadchannelregs(sc) 1234 struct com_softc *sc; 1235 { 1236 bus_space_tag_t iot = sc->sc_iot; 1237 bus_space_handle_t ioh = sc->sc_ioh; 1238 1239 /* XXXXX necessary? */ 1240 com_iflush(sc); 1241 1242 bus_space_write_1(iot, ioh, com_ier, 0); 1243 1244 if (ISSET(sc->sc_hwflags, COM_HW_FLOW)) { 1245 bus_space_write_1(iot, ioh, com_lcr, LCR_EERS); 1246 bus_space_write_1(iot, ioh, com_efr, sc->sc_efr); 1247 } 1248 bus_space_write_1(iot, ioh, com_lcr, sc->sc_lcr | LCR_DLAB); 1249 bus_space_write_1(iot, ioh, com_dlbl, sc->sc_dlbl); 1250 bus_space_write_1(iot, ioh, com_dlbh, sc->sc_dlbh); 1251 bus_space_write_1(iot, ioh, com_lcr, sc->sc_lcr); 1252 bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr_active = sc->sc_mcr); 1253 bus_space_write_1(iot, ioh, com_fifo, sc->sc_fifo); 1254 1255 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1256 } 1257 1258 int 1259 comhwiflow(tp, block) 1260 struct tty *tp; 1261 int block; 1262 { 1263 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1264 int s; 1265 1266 if (sc->sc_mcr_rts == 0) 1267 return (0); 1268 1269 s = splserial(); 1270 if (block) { 1271 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1272 SET(sc->sc_rx_flags, RX_TTY_BLOCKED); 1273 com_hwiflow(sc); 1274 } 1275 } else { 1276 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1277 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1278 com_schedrx(sc); 1279 } 1280 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1281 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED); 1282 com_hwiflow(sc); 1283 } 1284 } 1285 splx(s); 1286 return (1); 1287 } 1288 1289 /* 1290 * (un)block input via hw flowcontrol 1291 */ 1292 void 1293 com_hwiflow(sc) 1294 struct com_softc *sc; 1295 { 1296 bus_space_tag_t iot = sc->sc_iot; 1297 bus_space_handle_t ioh = sc->sc_ioh; 1298 1299 if (sc->sc_mcr_rts == 0) 1300 return; 1301 1302 if (ISSET(sc->sc_rx_flags, RX_ANY_BLOCK)) { 1303 CLR(sc->sc_mcr, sc->sc_mcr_rts); 1304 CLR(sc->sc_mcr_active, sc->sc_mcr_rts); 1305 } else { 1306 SET(sc->sc_mcr, sc->sc_mcr_rts); 1307 SET(sc->sc_mcr_active, sc->sc_mcr_rts); 1308 } 1309 bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr_active); 1310 } 1311 1312 1313 void 1314 comstart(tp) 1315 struct tty *tp; 1316 { 1317 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1318 bus_space_tag_t iot = sc->sc_iot; 1319 bus_space_handle_t ioh = sc->sc_ioh; 1320 int s; 1321 1322 s = spltty(); 1323 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 1324 goto out; 1325 if (sc->sc_tx_stopped) 1326 goto out; 1327 1328 if (tp->t_outq.c_cc <= tp->t_lowat) { 1329 if (ISSET(tp->t_state, TS_ASLEEP)) { 1330 CLR(tp->t_state, TS_ASLEEP); 1331 wakeup(&tp->t_outq); 1332 } 1333 selwakeup(&tp->t_wsel); 1334 if (tp->t_outq.c_cc == 0) 1335 goto out; 1336 } 1337 1338 /* Grab the first contiguous region of buffer space. */ 1339 { 1340 u_char *tba; 1341 int tbc; 1342 1343 tba = tp->t_outq.c_cf; 1344 tbc = ndqb(&tp->t_outq, 0); 1345 1346 (void)splserial(); 1347 1348 sc->sc_tba = tba; 1349 sc->sc_tbc = tbc; 1350 } 1351 1352 SET(tp->t_state, TS_BUSY); 1353 sc->sc_tx_busy = 1; 1354 1355 /* Enable transmit completion interrupts if necessary. */ 1356 if (!ISSET(sc->sc_ier, IER_ETXRDY)) { 1357 SET(sc->sc_ier, IER_ETXRDY); 1358 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1359 } 1360 1361 /* Output the first chunk of the contiguous buffer. */ 1362 { 1363 int n; 1364 1365 n = sc->sc_tbc; 1366 if (n > sc->sc_fifolen) 1367 n = sc->sc_fifolen; 1368 bus_space_write_multi_1(iot, ioh, com_data, sc->sc_tba, n); 1369 sc->sc_tbc -= n; 1370 sc->sc_tba += n; 1371 } 1372 out: 1373 splx(s); 1374 return; 1375 } 1376 1377 /* 1378 * Stop output on a line. 1379 */ 1380 void 1381 comstop(tp, flag) 1382 struct tty *tp; 1383 int flag; 1384 { 1385 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1386 int s; 1387 1388 s = splserial(); 1389 if (ISSET(tp->t_state, TS_BUSY)) { 1390 /* Stop transmitting at the next chunk. */ 1391 sc->sc_tbc = 0; 1392 sc->sc_heldtbc = 0; 1393 if (!ISSET(tp->t_state, TS_TTSTOP)) 1394 SET(tp->t_state, TS_FLUSH); 1395 } 1396 splx(s); 1397 } 1398 1399 void 1400 comdiag(arg) 1401 void *arg; 1402 { 1403 struct com_softc *sc = arg; 1404 int overflows, floods; 1405 int s; 1406 1407 s = splserial(); 1408 overflows = sc->sc_overflows; 1409 sc->sc_overflows = 0; 1410 floods = sc->sc_floods; 1411 sc->sc_floods = 0; 1412 sc->sc_errors = 0; 1413 splx(s); 1414 1415 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1416 sc->sc_dev.dv_xname, 1417 overflows, overflows == 1 ? "" : "s", 1418 floods, floods == 1 ? "" : "s"); 1419 } 1420 1421 integrate void 1422 com_rxsoft(sc, tp) 1423 struct com_softc *sc; 1424 struct tty *tp; 1425 { 1426 int (*rint) __P((int c, struct tty *tp)) = linesw[tp->t_line].l_rint; 1427 u_char *get, *end; 1428 u_int cc, scc; 1429 u_char lsr; 1430 int code; 1431 int s; 1432 1433 end = sc->sc_ebuf; 1434 get = sc->sc_rbget; 1435 scc = cc = com_rbuf_size - sc->sc_rbavail; 1436 1437 if (cc == com_rbuf_size) { 1438 sc->sc_floods++; 1439 if (sc->sc_errors++ == 0) 1440 timeout(comdiag, sc, 60 * hz); 1441 } 1442 1443 while (cc) { 1444 code = get[0]; 1445 lsr = get[1]; 1446 if (ISSET(lsr, LSR_OE | LSR_BI | LSR_FE | LSR_PE)) { 1447 if (ISSET(lsr, LSR_OE)) { 1448 sc->sc_overflows++; 1449 if (sc->sc_errors++ == 0) 1450 timeout(comdiag, sc, 60 * hz); 1451 } 1452 if (ISSET(lsr, LSR_BI | LSR_FE)) 1453 SET(code, TTY_FE); 1454 if (ISSET(lsr, LSR_PE)) 1455 SET(code, TTY_PE); 1456 } 1457 if ((*rint)(code, tp) == -1) { 1458 /* 1459 * The line discipline's buffer is out of space. 1460 */ 1461 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1462 /* 1463 * We're either not using flow control, or the 1464 * line discipline didn't tell us to block for 1465 * some reason. Either way, we have no way to 1466 * know when there's more space available, so 1467 * just drop the rest of the data. 1468 */ 1469 get += cc << 1; 1470 if (get >= end) 1471 get -= com_rbuf_size << 1; 1472 cc = 0; 1473 } else { 1474 /* 1475 * Don't schedule any more receive processing 1476 * until the line discipline tells us there's 1477 * space available (through comhwiflow()). 1478 * Leave the rest of the data in the input 1479 * buffer. 1480 */ 1481 SET(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1482 } 1483 break; 1484 } 1485 get += 2; 1486 if (get >= end) 1487 get = sc->sc_rbuf; 1488 cc--; 1489 } 1490 1491 if (cc != scc) { 1492 sc->sc_rbget = get; 1493 s = splserial(); 1494 cc = sc->sc_rbavail += scc - cc; 1495 /* Buffers should be ok again, release possible block. */ 1496 if (cc >= sc->sc_r_lowat) { 1497 if (ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1498 CLR(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1499 SET(sc->sc_ier, IER_ERXRDY); 1500 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 1501 } 1502 if (ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED)) { 1503 CLR(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1504 com_hwiflow(sc); 1505 } 1506 } 1507 splx(s); 1508 } 1509 } 1510 1511 integrate void 1512 com_txsoft(sc, tp) 1513 struct com_softc *sc; 1514 struct tty *tp; 1515 { 1516 1517 CLR(tp->t_state, TS_BUSY); 1518 if (ISSET(tp->t_state, TS_FLUSH)) 1519 CLR(tp->t_state, TS_FLUSH); 1520 else 1521 ndflush(&tp->t_outq, (int)(sc->sc_tba - tp->t_outq.c_cf)); 1522 (*linesw[tp->t_line].l_start)(tp); 1523 } 1524 1525 integrate void 1526 com_stsoft(sc, tp) 1527 struct com_softc *sc; 1528 struct tty *tp; 1529 { 1530 u_char msr, delta; 1531 int s; 1532 1533 s = splserial(); 1534 msr = sc->sc_msr; 1535 delta = sc->sc_msr_delta; 1536 sc->sc_msr_delta = 0; 1537 splx(s); 1538 1539 if (ISSET(delta, sc->sc_msr_dcd)) { 1540 /* 1541 * Inform the tty layer that carrier detect changed. 1542 */ 1543 (void) (*linesw[tp->t_line].l_modem)(tp, ISSET(msr, MSR_DCD)); 1544 } 1545 1546 if (ISSET(delta, sc->sc_msr_cts)) { 1547 /* Block or unblock output according to flow control. */ 1548 if (ISSET(msr, sc->sc_msr_cts)) { 1549 sc->sc_tx_stopped = 0; 1550 (*linesw[tp->t_line].l_start)(tp); 1551 } else { 1552 sc->sc_tx_stopped = 1; 1553 } 1554 } 1555 1556 #ifdef COM_DEBUG 1557 if (com_debug) 1558 comstatus(sc, "com_stsoft"); 1559 #endif 1560 } 1561 1562 #ifdef __GENERIC_SOFT_INTERRUPTS 1563 void 1564 comsoft(arg) 1565 void *arg; 1566 { 1567 struct com_softc *sc = arg; 1568 struct tty *tp; 1569 1570 if (!sc->enabled) 1571 return; 1572 1573 { 1574 #else 1575 void 1576 #ifndef alpha 1577 comsoft() 1578 #else 1579 comsoft(arg) 1580 void *arg; 1581 #endif 1582 { 1583 struct com_softc *sc; 1584 struct tty *tp; 1585 int unit; 1586 #ifdef alpha 1587 int s; 1588 1589 s = splsoftserial(); 1590 com_softintr_scheduled = 0; 1591 #endif 1592 1593 for (unit = 0; unit < com_cd.cd_ndevs; unit++) { 1594 sc = com_cd.cd_devs[unit]; 1595 if (sc == NULL || !ISSET(sc->sc_hwflags, COM_HW_DEV_OK)) 1596 continue; 1597 1598 if (!sc->enabled) 1599 continue; 1600 1601 tp = sc->sc_tty; 1602 if (tp == NULL || !ISSET(tp->t_state, TS_ISOPEN | TS_WOPEN)) 1603 continue; 1604 #endif 1605 tp = sc->sc_tty; 1606 1607 if (sc->sc_rx_ready) { 1608 sc->sc_rx_ready = 0; 1609 com_rxsoft(sc, tp); 1610 } 1611 1612 if (sc->sc_st_check) { 1613 sc->sc_st_check = 0; 1614 com_stsoft(sc, tp); 1615 } 1616 1617 if (sc->sc_tx_done) { 1618 sc->sc_tx_done = 0; 1619 com_txsoft(sc, tp); 1620 } 1621 } 1622 1623 #ifndef __GENERIC_SOFT_INTERRUPTS 1624 #ifdef alpha 1625 splx(s); 1626 #endif 1627 #endif 1628 } 1629 1630 int 1631 comintr(arg) 1632 void *arg; 1633 { 1634 struct com_softc *sc = arg; 1635 bus_space_tag_t iot = sc->sc_iot; 1636 bus_space_handle_t ioh = sc->sc_ioh; 1637 u_char *put, *end; 1638 u_int cc; 1639 u_char lsr, iir; 1640 1641 if (!sc->enabled) 1642 return (0); 1643 1644 iir = bus_space_read_1(iot, ioh, com_iir); 1645 if (ISSET(iir, IIR_NOPEND)) 1646 return (0); 1647 1648 end = sc->sc_ebuf; 1649 put = sc->sc_rbput; 1650 cc = sc->sc_rbavail; 1651 1652 do { 1653 u_char msr, delta; 1654 1655 lsr = bus_space_read_1(iot, ioh, com_lsr); 1656 #if defined(DDB) || defined(KGDB) 1657 if (ISSET(lsr, LSR_BI)) { 1658 #ifdef DDB 1659 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 1660 Debugger(); 1661 continue; 1662 } 1663 #endif 1664 #ifdef KGDB 1665 if (ISSET(sc->sc_hwflags, COM_HW_KGDB)) { 1666 kgdb_connect(1); 1667 continue; 1668 } 1669 #endif 1670 } 1671 #endif /* DDB || KGDB */ 1672 1673 if (ISSET(lsr, LSR_RCV_MASK) && 1674 !ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1675 while (cc > 0) { 1676 put[0] = bus_space_read_1(iot, ioh, com_data); 1677 put[1] = lsr; 1678 put += 2; 1679 if (put >= end) 1680 put = sc->sc_rbuf; 1681 cc--; 1682 1683 lsr = bus_space_read_1(iot, ioh, com_lsr); 1684 if (!ISSET(lsr, LSR_RCV_MASK)) 1685 break; 1686 } 1687 1688 /* 1689 * Current string of incoming characters ended because 1690 * no more data was available or we ran out of space. 1691 * Schedule a receive event if any data was received. 1692 * If we're out of space, turn off receive interrupts. 1693 */ 1694 sc->sc_rbput = put; 1695 sc->sc_rbavail = cc; 1696 if (!ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) 1697 sc->sc_rx_ready = 1; 1698 1699 /* 1700 * See if we are in danger of overflowing a buffer. If 1701 * so, use hardware flow control to ease the pressure. 1702 */ 1703 if (!ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED) && 1704 cc < sc->sc_r_hiwat) { 1705 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1706 com_hwiflow(sc); 1707 } 1708 1709 /* 1710 * If we're out of space, disable receive interrupts 1711 * until the queue has drained a bit. 1712 */ 1713 if (!cc) { 1714 SET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1715 CLR(sc->sc_ier, IER_ERXRDY); 1716 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1717 } 1718 } else { 1719 if ((iir & IIR_IMASK) == IIR_RXRDY) { 1720 bus_space_write_1(iot, ioh, com_ier, 0); 1721 delay(10); 1722 bus_space_write_1(iot, ioh, com_ier,sc->sc_ier); 1723 iir = IIR_NOPEND; 1724 continue; 1725 } 1726 } 1727 1728 msr = bus_space_read_1(iot, ioh, com_msr); 1729 delta = msr ^ sc->sc_msr; 1730 sc->sc_msr = msr; 1731 if (ISSET(delta, sc->sc_msr_mask)) { 1732 SET(sc->sc_msr_delta, delta); 1733 1734 /* 1735 * Stop output immediately if we lose the output 1736 * flow control signal or carrier detect. 1737 */ 1738 if (ISSET(~msr, sc->sc_msr_mask)) { 1739 sc->sc_tbc = 0; 1740 sc->sc_heldtbc = 0; 1741 #ifdef COM_DEBUG 1742 if (com_debug) 1743 comstatus(sc, "comintr "); 1744 #endif 1745 } 1746 1747 sc->sc_st_check = 1; 1748 } 1749 } while (!ISSET((iir = bus_space_read_1(iot, ioh, com_iir)), IIR_NOPEND)); 1750 1751 /* 1752 * Done handling any receive interrupts. See if data can be 1753 * transmitted as well. Schedule tx done event if no data left 1754 * and tty was marked busy. 1755 */ 1756 if (ISSET(lsr, LSR_TXRDY)) { 1757 /* 1758 * If we've delayed a parameter change, do it now, and restart 1759 * output. 1760 */ 1761 if (sc->sc_heldchange) { 1762 com_loadchannelregs(sc); 1763 sc->sc_heldchange = 0; 1764 sc->sc_tbc = sc->sc_heldtbc; 1765 sc->sc_heldtbc = 0; 1766 } 1767 1768 /* Output the next chunk of the contiguous buffer, if any. */ 1769 if (sc->sc_tbc > 0) { 1770 int n; 1771 1772 n = sc->sc_tbc; 1773 if (n > sc->sc_fifolen) 1774 n = sc->sc_fifolen; 1775 bus_space_write_multi_1(iot, ioh, com_data, sc->sc_tba, n); 1776 sc->sc_tbc -= n; 1777 sc->sc_tba += n; 1778 } else { 1779 /* Disable transmit completion interrupts if necessary. */ 1780 if (ISSET(sc->sc_ier, IER_ETXRDY)) { 1781 CLR(sc->sc_ier, IER_ETXRDY); 1782 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1783 } 1784 if (sc->sc_tx_busy) { 1785 sc->sc_tx_busy = 0; 1786 sc->sc_tx_done = 1; 1787 } 1788 } 1789 } 1790 1791 /* Wake up the poller. */ 1792 #ifdef __GENERIC_SOFT_INTERRUPTS 1793 softintr_schedule(sc->sc_si); 1794 #else 1795 #ifndef alpha 1796 setsoftserial(); 1797 #else 1798 if (!com_softintr_scheduled) { 1799 com_softintr_scheduled = 1; 1800 timeout(comsoft, NULL, 1); 1801 } 1802 #endif 1803 #endif 1804 1805 #if NRND > 0 && defined(RND_COM) 1806 rnd_add_uint32(&sc->rnd_source, iir | lsr); 1807 #endif 1808 1809 return (1); 1810 } 1811 1812 /* 1813 * The following functions are polled getc and putc routines, shared 1814 * by the console and kgdb glue. 1815 */ 1816 1817 int 1818 com_common_getc(iot, ioh) 1819 bus_space_tag_t iot; 1820 bus_space_handle_t ioh; 1821 { 1822 int s = splserial(); 1823 u_char stat, c; 1824 int timo; 1825 1826 timo = 50000; 1827 while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_RXRDY) 1828 && --timo) 1829 ; 1830 #ifdef DIAGNOSTIC 1831 if (!timo) 1832 printf("com_common_getc timeout\n"); 1833 #endif 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 #ifdef DIAGNOSTIC 1856 if (!timo) 1857 printf("com_common_putc flush timeout\n"); 1858 #endif 1859 bus_space_write_1(iot, ioh, com_data, c); 1860 /* wait for this transmission to complete */ 1861 timo = 1500000; 1862 while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_TXRDY) 1863 && --timo) 1864 ; 1865 #ifdef DIAGNOSTIC 1866 if (!timo) 1867 printf("com_common_putc wait timeout\n"); 1868 #endif 1869 /* clear any interrupts generated by this transmission */ 1870 stat = bus_space_read_1(iot, ioh, com_iir); 1871 splx(s); 1872 } 1873 1874 /* 1875 * Initialize UART to known state. 1876 */ 1877 int 1878 cominit(iot, iobase, rate, frequency, cflag, iohp) 1879 bus_space_tag_t iot; 1880 int iobase; 1881 int rate, frequency; 1882 tcflag_t cflag; 1883 bus_space_handle_t *iohp; 1884 { 1885 bus_space_handle_t ioh; 1886 1887 if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) 1888 return (ENOMEM); /* ??? */ 1889 1890 bus_space_write_1(iot, ioh, com_lcr, LCR_EERS); 1891 bus_space_write_1(iot, ioh, com_efr, 0); 1892 bus_space_write_1(iot, ioh, com_lcr, LCR_DLAB); 1893 rate = comspeed(rate, frequency); 1894 bus_space_write_1(iot, ioh, com_dlbl, rate); 1895 bus_space_write_1(iot, ioh, com_dlbh, rate >> 8); 1896 bus_space_write_1(iot, ioh, com_lcr, cflag2lcr(cflag)); 1897 bus_space_write_1(iot, ioh, com_mcr, 0); 1898 bus_space_write_1(iot, ioh, com_fifo, 1899 FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_1); 1900 bus_space_write_1(iot, ioh, com_ier, 0); 1901 1902 *iohp = ioh; 1903 return (0); 1904 } 1905 1906 /* 1907 * Following are all routines needed for COM to act as console 1908 */ 1909 1910 int 1911 comcnattach(iot, iobase, rate, frequency, cflag) 1912 bus_space_tag_t iot; 1913 int iobase; 1914 int rate, frequency; 1915 tcflag_t cflag; 1916 { 1917 int res; 1918 static struct consdev comcons = { 1919 NULL, NULL, comcngetc, comcnputc, comcnpollc, NODEV, CN_NORMAL 1920 }; 1921 1922 res = cominit(iot, iobase, rate, frequency, cflag, &comconsioh); 1923 if (res) 1924 return (res); 1925 1926 cn_tab = &comcons; 1927 1928 comconstag = iot; 1929 comconsaddr = iobase; 1930 comconsrate = rate; 1931 comconscflag = cflag; 1932 1933 return (0); 1934 } 1935 1936 int 1937 comcngetc(dev) 1938 dev_t dev; 1939 { 1940 1941 return (com_common_getc(comconstag, comconsioh)); 1942 } 1943 1944 /* 1945 * Console kernel output character routine. 1946 */ 1947 void 1948 comcnputc(dev, c) 1949 dev_t dev; 1950 int c; 1951 { 1952 1953 com_common_putc(comconstag, comconsioh, c); 1954 } 1955 1956 void 1957 comcnpollc(dev, on) 1958 dev_t dev; 1959 int on; 1960 { 1961 1962 } 1963 1964 #ifdef KGDB 1965 int 1966 com_kgdb_attach(iot, iobase, rate, frequency, cflag) 1967 bus_space_tag_t iot; 1968 int iobase; 1969 int rate, frequency; 1970 tcflag_t cflag; 1971 { 1972 int res; 1973 1974 if (iot == comconstag && iobase == comconsaddr) 1975 return (EBUSY); /* cannot share with console */ 1976 1977 res = cominit(iot, iobase, rate, frequency, cflag, &com_kgdb_ioh); 1978 if (res) 1979 return (res); 1980 1981 kgdb_attach(com_kgdb_getc, com_kgdb_putc, NULL); 1982 kgdb_dev = 123; /* unneeded, only to satisfy some tests */ 1983 1984 com_kgdb_iot = iot; 1985 com_kgdb_addr = iobase; 1986 1987 return (0); 1988 } 1989 1990 /* ARGSUSED */ 1991 int 1992 com_kgdb_getc(arg) 1993 void *arg; 1994 { 1995 1996 return (com_common_getc(com_kgdb_iot, com_kgdb_ioh)); 1997 } 1998 1999 /* ARGSUSED */ 2000 void 2001 com_kgdb_putc(arg, c) 2002 void *arg; 2003 int c; 2004 { 2005 2006 return (com_common_putc(com_kgdb_iot, com_kgdb_ioh, c)); 2007 } 2008 #endif /* KGDB */ 2009 2010 /* helper function to identify the com ports used by 2011 console or KGDB (and not yet autoconf attached) */ 2012 int 2013 com_is_console(iot, iobase, ioh) 2014 bus_space_tag_t iot; 2015 int iobase; 2016 bus_space_handle_t *ioh; 2017 { 2018 bus_space_handle_t help; 2019 2020 if (!comconsattached && 2021 iot == comconstag && iobase == comconsaddr) 2022 help = comconsioh; 2023 #ifdef KGDB 2024 else if (!com_kgdb_attached && 2025 iot == com_kgdb_iot && iobase == com_kgdb_addr) 2026 help = com_kgdb_ioh; 2027 #endif 2028 else 2029 return (0); 2030 2031 if (ioh) 2032 *ioh = help; 2033 return (1); 2034 } 2035
Indexes created Tue Sep 23 20:09:58 GMT 2025