com.c revision 1.130
1 /* $NetBSD: com.c,v 1.130 1998/01/12 09:23:19 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 int comspeed __P((long, long)); 121 static u_char cflag2lcr __P((tcflag_t)); 122 int comparam __P((struct tty *, struct termios *)); 123 void comstart __P((struct tty *)); 124 void comstop __P((struct tty *, int)); 125 int comhwiflow __P((struct tty *, int)); 126 127 void com_loadchannelregs __P((struct com_softc *)); 128 void com_hwiflow __P((struct com_softc *)); 129 void com_break __P((struct com_softc *, int)); 130 void com_modem __P((struct com_softc *, int)); 131 void com_iflush __P((struct com_softc *)); 132 133 int com_common_getc __P((bus_space_tag_t, bus_space_handle_t)); 134 void com_common_putc __P((bus_space_tag_t, bus_space_handle_t, int)); 135 136 /* XXX: These belong elsewhere */ 137 cdev_decl(com); 138 bdev_decl(com); 139 140 int comcngetc __P((dev_t)); 141 void comcnputc __P((dev_t, int)); 142 void comcnpollc __P((dev_t, int)); 143 144 #define integrate static inline 145 #ifdef __GENERIC_SOFT_INTERRUPTS 146 void comsoft __P((void *)); 147 #else 148 #ifndef alpha 149 void comsoft __P((void)); 150 #else 151 void comsoft __P((void *)); 152 #endif 153 #endif 154 integrate void com_rxsoft __P((struct com_softc *, struct tty *)); 155 integrate void com_txsoft __P((struct com_softc *, struct tty *)); 156 integrate void com_stsoft __P((struct com_softc *, struct tty *)); 157 integrate void com_schedrx __P((struct com_softc *)); 158 void comdiag __P((void *)); 159 160 extern struct cfdriver com_cd; 161 162 /* 163 * Make this an option variable one can patch. 164 * But be warned: this must be a power of 2! 165 */ 166 u_int com_rbuf_size = COM_RING_SIZE; 167 168 /* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */ 169 u_int com_rbuf_hiwat = (COM_RING_SIZE * 1) / 4; 170 u_int com_rbuf_lowat = (COM_RING_SIZE * 3) / 4; 171 172 static int comconsaddr; 173 static bus_space_tag_t comconstag; 174 static bus_space_handle_t comconsioh; 175 static int comconsattached; 176 static int comconsrate; 177 static tcflag_t comconscflag; 178 179 static u_char tiocm_xxx2mcr __P((int)); 180 181 #ifndef __GENERIC_SOFT_INTERRUPTS 182 #ifdef alpha 183 volatile int com_softintr_scheduled; 184 #endif 185 #endif 186 187 #ifdef KGDB 188 #include <sys/kgdb.h> 189 190 static int com_kgdb_addr; 191 static bus_space_tag_t com_kgdb_iot; 192 static bus_space_handle_t com_kgdb_ioh; 193 static int com_kgdb_attached; 194 195 int com_kgdb_getc __P((void *)); 196 void com_kgdb_putc __P((void *, int)); 197 #endif /* KGDB */ 198 199 #define COMUNIT(x) (minor(x)) 200 201 int 202 comspeed(speed, frequency) 203 long speed, frequency; 204 { 205 #define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */ 206 207 int x, err; 208 209 #if 0 210 if (speed == 0) 211 return (0); 212 #endif 213 if (speed <= 0) 214 return (-1); 215 x = divrnd(frequency / 16, speed); 216 if (x <= 0) 217 return (-1); 218 err = divrnd(((quad_t)frequency) * 1000 / 16, speed * x) - 1000; 219 if (err < 0) 220 err = -err; 221 if (err > COM_TOLERANCE) 222 return (-1); 223 return (x); 224 225 #undef divrnd(n, q) 226 } 227 228 #ifdef COM_DEBUG 229 int com_debug = 0; 230 231 void comstatus __P((struct com_softc *, char *)); 232 void 233 comstatus(sc, str) 234 struct com_softc *sc; 235 char *str; 236 { 237 struct tty *tp = sc->sc_tty; 238 239 printf("%s: %s %sclocal %sdcd %sts_carr_on %sdtr %stx_stopped\n", 240 sc->sc_dev.dv_xname, str, 241 ISSET(tp->t_cflag, CLOCAL) ? "+" : "-", 242 ISSET(sc->sc_msr, MSR_DCD) ? "+" : "-", 243 ISSET(tp->t_state, TS_CARR_ON) ? "+" : "-", 244 ISSET(sc->sc_mcr, MCR_DTR) ? "+" : "-", 245 sc->sc_tx_stopped ? "+" : "-"); 246 247 printf("%s: %s %scrtscts %scts %sts_ttstop %srts %xrx_flags\n", 248 sc->sc_dev.dv_xname, str, 249 ISSET(tp->t_cflag, CRTSCTS) ? "+" : "-", 250 ISSET(sc->sc_msr, MSR_CTS) ? "+" : "-", 251 ISSET(tp->t_state, TS_TTSTOP) ? "+" : "-", 252 ISSET(sc->sc_mcr, MCR_RTS) ? "+" : "-", 253 sc->sc_rx_flags); 254 } 255 #endif 256 257 int 258 comprobe1(iot, ioh, iobase) 259 bus_space_tag_t iot; 260 bus_space_handle_t ioh; 261 int iobase; 262 { 263 264 /* force access to id reg */ 265 bus_space_write_1(iot, ioh, com_lcr, 0); 266 bus_space_write_1(iot, ioh, com_iir, 0); 267 if (bus_space_read_1(iot, ioh, com_iir) & 0x38) 268 return (0); 269 270 return (1); 271 } 272 273 #ifdef COM_HAYESP 274 int 275 comprobeHAYESP(hayespioh, sc) 276 bus_space_handle_t hayespioh; 277 struct com_softc *sc; 278 { 279 char val, dips; 280 int combaselist[] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8 }; 281 bus_space_tag_t iot = sc->sc_iot; 282 283 /* 284 * Hayes ESP cards have two iobases. One is for compatibility with 285 * 16550 serial chips, and at the same ISA PC base addresses. The 286 * other is for ESP-specific enhanced features, and lies at a 287 * different addressing range entirely (0x140, 0x180, 0x280, or 0x300). 288 */ 289 290 /* Test for ESP signature */ 291 if ((bus_space_read_1(iot, hayespioh, 0) & 0xf3) == 0) 292 return (0); 293 294 /* 295 * ESP is present at ESP enhanced base address; unknown com port 296 */ 297 298 /* Get the dip-switch configurations */ 299 bus_space_write_1(iot, hayespioh, HAYESP_CMD1, HAYESP_GETDIPS); 300 dips = bus_space_read_1(iot, hayespioh, HAYESP_STATUS1); 301 302 /* Determine which com port this ESP card services: bits 0,1 of */ 303 /* dips is the port # (0-3); combaselist[val] is the com_iobase */ 304 if (sc->sc_iobase != combaselist[dips & 0x03]) 305 return (0); 306 307 printf(": ESP"); 308 309 /* Check ESP Self Test bits. */ 310 /* Check for ESP version 2.0: bits 4,5,6 == 010 */ 311 bus_space_write_1(iot, hayespioh, HAYESP_CMD1, HAYESP_GETTEST); 312 val = bus_space_read_1(iot, hayespioh, HAYESP_STATUS1); /* Clear reg1 */ 313 val = bus_space_read_1(iot, hayespioh, HAYESP_STATUS2); 314 if ((val & 0x70) < 0x20) { 315 printf("-old (%o)", val & 0x70); 316 /* we do not support the necessary features */ 317 return (0); 318 } 319 320 /* Check for ability to emulate 16550: bit 8 == 1 */ 321 if ((dips & 0x80) == 0) { 322 printf(" slave"); 323 /* XXX Does slave really mean no 16550 support?? */ 324 return (0); 325 } 326 327 /* 328 * If we made it this far, we are a full-featured ESP v2.0 (or 329 * better), at the correct com port address. 330 */ 331 332 SET(sc->sc_hwflags, COM_HW_HAYESP); 333 printf(", 1024 byte fifo\n"); 334 return (1); 335 } 336 #endif 337 338 #if defined(DDB) || defined(KGDB) 339 static void 340 com_enable_debugport(sc) 341 struct com_softc *sc; 342 { 343 int s; 344 345 /* Turn on line break interrupt, set carrier. */ 346 s = splserial(); 347 sc->sc_ier = IER_ERXRDY; 348 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 349 SET(sc->sc_mcr, MCR_DTR | MCR_RTS); 350 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_mcr, sc->sc_mcr); 351 splx(s); 352 } 353 #endif 354 355 void 356 com_attach_subr(sc) 357 struct com_softc *sc; 358 { 359 int iobase = sc->sc_iobase; 360 bus_space_tag_t iot = sc->sc_iot; 361 bus_space_handle_t ioh = sc->sc_ioh; 362 struct tty *tp; 363 #ifdef COM16650 364 u_int8_t lcr; 365 #endif 366 #ifdef COM_HAYESP 367 int hayesp_ports[] = { 0x140, 0x180, 0x280, 0x300, 0 }; 368 int *hayespp; 369 #endif 370 371 /* Disable interrupts before configuring the device. */ 372 sc->sc_ier = 0; 373 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 374 375 if (iot == comconstag && iobase == comconsaddr) { 376 comconsattached = 1; 377 378 /* Make sure the console is always "hardwired". */ 379 delay(1000); /* wait for output to finish */ 380 SET(sc->sc_hwflags, COM_HW_CONSOLE); 381 SET(sc->sc_swflags, TIOCFLAG_SOFTCAR); 382 } 383 384 #ifdef COM_HAYESP 385 /* Look for a Hayes ESP board. */ 386 for (hayespp = hayesp_ports; *hayespp != 0; hayespp++) { 387 bus_space_handle_t hayespioh; 388 389 #define HAYESP_NPORTS 8 /* XXX XXX XXX ??? ??? ??? */ 390 if (bus_space_map(iot, *hayespp, HAYESP_NPORTS, 0, &hayespioh)) 391 continue; 392 if (comprobeHAYESP(hayespioh, sc)) { 393 sc->sc_hayespioh = hayespioh; 394 sc->sc_fifolen = 1024; 395 396 /* Set 16550 compatibility mode */ 397 bus_space_write_1(iot, hayespioh, HAYESP_CMD1, HAYESP_SETMODE); 398 bus_space_write_1(iot, hayespioh, HAYESP_CMD2, 399 HAYESP_MODE_FIFO|HAYESP_MODE_RTS| 400 HAYESP_MODE_SCALE); 401 402 /* Set RTS/CTS flow control */ 403 bus_space_write_1(iot, hayespioh, HAYESP_CMD1, HAYESP_SETFLOWTYPE); 404 bus_space_write_1(iot, hayespioh, HAYESP_CMD2, HAYESP_FLOW_RTS); 405 bus_space_write_1(iot, hayespioh, HAYESP_CMD2, HAYESP_FLOW_CTS); 406 407 /* Set flow control levels */ 408 bus_space_write_1(iot, hayespioh, HAYESP_CMD1, HAYESP_SETRXFLOW); 409 bus_space_write_1(iot, hayespioh, HAYESP_CMD2, 410 HAYESP_HIBYTE(HAYESP_RXHIWMARK)); 411 bus_space_write_1(iot, hayespioh, HAYESP_CMD2, 412 HAYESP_LOBYTE(HAYESP_RXHIWMARK)); 413 bus_space_write_1(iot, hayespioh, HAYESP_CMD2, 414 HAYESP_HIBYTE(HAYESP_RXLOWMARK)); 415 bus_space_write_1(iot, hayespioh, HAYESP_CMD2, 416 HAYESP_LOBYTE(HAYESP_RXLOWMARK)); 417 418 break; 419 } 420 bus_space_unmap(iot, hayespioh, HAYESP_NPORTS); 421 } 422 /* No ESP; look for other things. */ 423 if (*hayespp == 0) { 424 #endif 425 sc->sc_fifolen = 1; 426 /* look for a NS 16550AF UART with FIFOs */ 427 bus_space_write_1(iot, ioh, com_fifo, 428 FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_14); 429 delay(100); 430 if (ISSET(bus_space_read_1(iot, ioh, com_iir), IIR_FIFO_MASK) 431 == IIR_FIFO_MASK) 432 if (ISSET(bus_space_read_1(iot, ioh, com_fifo), FIFO_TRIGGER_14) 433 == FIFO_TRIGGER_14) { 434 SET(sc->sc_hwflags, COM_HW_FIFO); 435 436 #ifdef COM16650 437 /* 438 * IIR changes into the EFR if LCR is set to LCR_EERS 439 * on 16650s. We also know IIR != 0 at this point. 440 * Write 0 into the EFR, and read it. If the result 441 * is 0, we have a 16650. 442 * 443 * Older 16650s were broken; the test to detect them 444 * is taken from the Linux driver. Apparently 445 * setting DLAB enable gives access to the EFR on 446 * these chips. 447 */ 448 lcr = bus_space_read_1(iot, ioh, com_lcr); 449 bus_space_write_1(iot, ioh, com_lcr, LCR_EERS); 450 bus_space_write_1(iot, ioh, com_efr, 0); 451 if (bus_space_read_1(iot, ioh, com_efr) == 0) { 452 bus_space_write_1(iot, ioh, com_lcr, 453 lcr | LCR_DLAB); 454 if (bus_space_read_1(iot, ioh, com_efr) == 0) { 455 CLR(sc->sc_hwflags, COM_HW_FIFO); 456 sc->sc_fifolen = 0; 457 } else { 458 SET(sc->sc_hwflags, COM_HW_FLOW); 459 sc->sc_fifolen = 32; 460 } 461 } else 462 #endif 463 sc->sc_fifolen = 16; 464 465 #ifdef COM16650 466 bus_space_write_1(iot, ioh, com_lcr, lcr); 467 if (sc->sc_fifolen == 0) 468 printf(": st16650, broken fifo\n"); 469 else if (sc->sc_fifolen == 32) 470 printf(": st16650a, working fifo\n"); 471 else 472 #endif 473 printf(": ns16550a, working fifo\n"); 474 } else 475 printf(": ns16550, broken fifo\n"); 476 else 477 printf(": ns8250 or ns16450, no fifo\n"); 478 bus_space_write_1(iot, ioh, com_fifo, 0); 479 #ifdef COM_HAYESP 480 } 481 #endif 482 483 tp = ttymalloc(); 484 tp->t_oproc = comstart; 485 tp->t_param = comparam; 486 tp->t_hwiflow = comhwiflow; 487 tty_attach(tp); 488 489 sc->sc_tty = tp; 490 sc->sc_rbuf = malloc(com_rbuf_size << 1, M_DEVBUF, M_WAITOK); 491 sc->sc_ebuf = sc->sc_rbuf + (com_rbuf_size << 1); 492 493 if (!ISSET(sc->sc_hwflags, COM_HW_NOIEN)) 494 SET(sc->sc_mcr, MCR_IENABLE); 495 496 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 497 int maj; 498 499 /* locate the major number */ 500 for (maj = 0; maj < nchrdev; maj++) 501 if (cdevsw[maj].d_open == comopen) 502 break; 503 504 cn_tab->cn_dev = makedev(maj, sc->sc_dev.dv_unit); 505 #ifdef DDB 506 com_enable_debugport(sc); 507 #endif 508 printf("%s: console\n", sc->sc_dev.dv_xname); 509 } 510 511 #ifdef KGDB 512 /* 513 * Allow kgdb to "take over" this port. If this is 514 * the kgdb device, it has exclusive use. 515 */ 516 if (iot == com_kgdb_iot && iobase == com_kgdb_addr) { 517 com_kgdb_attached = 1; 518 519 SET(sc->sc_hwflags, COM_HW_KGDB); 520 com_enable_debugport(sc); 521 printf("%s: kgdb\n", sc->sc_dev.dv_xname); 522 } 523 #endif 524 525 #ifdef __GENERIC_SOFT_INTERRUPTS 526 sc->sc_si = softintr_establish(IPL_SOFTSERIAL, comsoft, sc); 527 #endif 528 529 #if NRND > 0 && defined(RND_COM) 530 rnd_attach_source(&sc->rnd_source, sc->sc_dev.dv_xname, 531 RND_TYPE_TTY); 532 #endif 533 } 534 535 int 536 comopen(dev, flag, mode, p) 537 dev_t dev; 538 int flag, mode; 539 struct proc *p; 540 { 541 int unit = COMUNIT(dev); 542 struct com_softc *sc; 543 struct tty *tp; 544 int s, s2; 545 int error = 0; 546 547 if (unit >= com_cd.cd_ndevs) 548 return (ENXIO); 549 sc = com_cd.cd_devs[unit]; 550 if (!sc) 551 return (ENXIO); 552 553 #ifdef KGDB 554 /* 555 * If this is the kgdb port, no other use is permitted. 556 */ 557 if (ISSET(sc->sc_hwflags, COM_HW_KGDB)) 558 return (EBUSY); 559 #endif 560 561 tp = sc->sc_tty; 562 563 if (ISSET(tp->t_state, TS_ISOPEN) && 564 ISSET(tp->t_state, TS_XCLUDE) && 565 p->p_ucred->cr_uid != 0) 566 return (EBUSY); 567 568 s = spltty(); 569 570 /* We need to set this early for the benefit of comsoft(). */ 571 SET(tp->t_state, TS_WOPEN); 572 573 /* 574 * Do the following iff this is a first open. 575 */ 576 if (!ISSET(tp->t_state, TS_ISOPEN)) { 577 struct termios t; 578 579 tp->t_dev = dev; 580 581 s2 = splserial(); 582 583 /* Turn on interrupts. */ 584 sc->sc_ier = IER_ERXRDY | IER_ERLS | IER_EMSC; 585 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 586 587 /* Fetch the current modem control status, needed later. */ 588 sc->sc_msr = bus_space_read_1(sc->sc_iot, sc->sc_ioh, com_msr); 589 590 splx(s2); 591 592 /* 593 * Initialize the termios status to the defaults. Add in the 594 * sticky bits from TIOCSFLAGS. 595 */ 596 t.c_ispeed = 0; 597 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 598 t.c_ospeed = comconsrate; 599 t.c_cflag = comconscflag; 600 } else { 601 t.c_ospeed = TTYDEF_SPEED; 602 t.c_cflag = TTYDEF_CFLAG; 603 } 604 if (ISSET(sc->sc_swflags, TIOCFLAG_CLOCAL)) 605 SET(t.c_cflag, CLOCAL); 606 if (ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS)) 607 SET(t.c_cflag, CRTSCTS); 608 if (ISSET(sc->sc_swflags, TIOCFLAG_MDMBUF)) 609 SET(t.c_cflag, MDMBUF); 610 /* Make sure comparam() will do something. */ 611 tp->t_ospeed = 0; 612 (void) comparam(tp, &t); 613 tp->t_iflag = TTYDEF_IFLAG; 614 tp->t_oflag = TTYDEF_OFLAG; 615 tp->t_lflag = TTYDEF_LFLAG; 616 ttychars(tp); 617 ttsetwater(tp); 618 619 /* 620 * Turn on DTR. We must always do this, even if carrier is not 621 * present, because otherwise we'd have to use TIOCSDTR 622 * immediately after setting CLOCAL, which applications do not 623 * expect. We always assert DTR while the device is open 624 * unless explicitly requested to deassert it. 625 */ 626 com_modem(sc, 1); 627 628 s2 = splserial(); 629 630 /* Clear the input ring, and unblock. */ 631 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 632 sc->sc_rbavail = com_rbuf_size; 633 com_iflush(sc); 634 CLR(sc->sc_rx_flags, RX_ANY_BLOCK); 635 com_hwiflow(sc); 636 637 #ifdef COM_DEBUG 638 if (com_debug) 639 comstatus(sc, "comopen "); 640 #endif 641 642 splx(s2); 643 } 644 error = 0; 645 646 /* If we're doing a blocking open... */ 647 if (!ISSET(flag, O_NONBLOCK)) 648 /* ...then wait for carrier. */ 649 while (!ISSET(tp->t_state, TS_CARR_ON) && 650 !ISSET(tp->t_cflag, CLOCAL | MDMBUF)) { 651 error = ttysleep(tp, &tp->t_rawq, TTIPRI | PCATCH, 652 ttopen, 0); 653 if (error) { 654 /* 655 * If the open was interrupted and nobody 656 * else has the device open, then hang up. 657 */ 658 if (!ISSET(tp->t_state, TS_ISOPEN)) { 659 com_modem(sc, 0); 660 CLR(tp->t_state, TS_WOPEN); 661 ttwakeup(tp); 662 } 663 break; 664 } 665 SET(tp->t_state, TS_WOPEN); 666 } 667 668 splx(s); 669 if (error == 0) 670 error = (*linesw[tp->t_line].l_open)(dev, tp); 671 return (error); 672 } 673 674 int 675 comclose(dev, flag, mode, p) 676 dev_t dev; 677 int flag, mode; 678 struct proc *p; 679 { 680 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 681 struct tty *tp = sc->sc_tty; 682 int s; 683 684 /* XXX This is for cons.c. */ 685 if (!ISSET(tp->t_state, TS_ISOPEN)) 686 return (0); 687 688 (*linesw[tp->t_line].l_close)(tp, flag); 689 ttyclose(tp); 690 691 s = splserial(); 692 693 /* If we were asserting flow control, then deassert it. */ 694 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 695 com_hwiflow(sc); 696 697 splx(s); 698 699 /* Clear any break condition set with TIOCSBRK. */ 700 com_break(sc, 0); 701 702 /* 703 * Hang up if necessary. Wait a bit, so the other side has time to 704 * notice even if we immediately open the port again. 705 */ 706 if (ISSET(tp->t_cflag, HUPCL)) { 707 com_modem(sc, 0); 708 (void) tsleep(sc, TTIPRI, ttclos, hz); 709 } 710 711 s = splserial(); 712 713 /* Turn off interrupts. */ 714 #ifdef DDB 715 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) 716 sc->sc_ier = IER_ERXRDY; /* interrupt on break */ 717 else 718 #endif 719 sc->sc_ier = 0; 720 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 721 722 splx(s); 723 724 return (0); 725 } 726 727 int 728 comread(dev, uio, flag) 729 dev_t dev; 730 struct uio *uio; 731 int flag; 732 { 733 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 734 struct tty *tp = sc->sc_tty; 735 736 return ((*linesw[tp->t_line].l_read)(tp, uio, flag)); 737 } 738 739 int 740 comwrite(dev, uio, flag) 741 dev_t dev; 742 struct uio *uio; 743 int flag; 744 { 745 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 746 struct tty *tp = sc->sc_tty; 747 748 return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 749 } 750 751 struct tty * 752 comtty(dev) 753 dev_t dev; 754 { 755 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 756 struct tty *tp = sc->sc_tty; 757 758 return (tp); 759 } 760 761 static u_char 762 tiocm_xxx2mcr(data) 763 int data; 764 { 765 u_char m = 0; 766 767 if (ISSET(data, TIOCM_DTR)) 768 SET(m, MCR_DTR); 769 if (ISSET(data, TIOCM_RTS)) 770 SET(m, MCR_RTS); 771 return m; 772 } 773 774 int 775 comioctl(dev, cmd, data, flag, p) 776 dev_t dev; 777 u_long cmd; 778 caddr_t data; 779 int flag; 780 struct proc *p; 781 { 782 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 783 struct tty *tp = sc->sc_tty; 784 int error; 785 786 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); 787 if (error >= 0) 788 return (error); 789 790 error = ttioctl(tp, cmd, data, flag, p); 791 if (error >= 0) 792 return (error); 793 794 switch (cmd) { 795 case TIOCSBRK: 796 com_break(sc, 1); 797 break; 798 799 case TIOCCBRK: 800 com_break(sc, 0); 801 break; 802 803 case TIOCSDTR: 804 com_modem(sc, 1); 805 break; 806 807 case TIOCCDTR: 808 com_modem(sc, 0); 809 break; 810 811 case TIOCGFLAGS: 812 *(int *)data = sc->sc_swflags; 813 break; 814 815 case TIOCSFLAGS: 816 error = suser(p->p_ucred, &p->p_acflag); 817 if (error) 818 return (error); 819 sc->sc_swflags = *(int *)data; 820 break; 821 822 case TIOCMSET: 823 CLR(sc->sc_mcr, MCR_DTR | MCR_RTS); 824 /*FALLTHROUGH*/ 825 826 case TIOCMBIS: 827 SET(sc->sc_mcr, tiocm_xxx2mcr(*(int *)data)); 828 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_mcr, sc->sc_mcr); 829 break; 830 831 case TIOCMBIC: 832 CLR(sc->sc_mcr, tiocm_xxx2mcr(*(int *)data)); 833 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_mcr, sc->sc_mcr); 834 break; 835 836 case TIOCMGET: { 837 u_char m; 838 int bits = 0; 839 840 m = sc->sc_mcr; 841 if (ISSET(m, MCR_DTR)) 842 SET(bits, TIOCM_DTR); 843 if (ISSET(m, MCR_RTS)) 844 SET(bits, TIOCM_RTS); 845 m = sc->sc_msr; 846 if (ISSET(m, MSR_DCD)) 847 SET(bits, TIOCM_CD); 848 if (ISSET(m, MSR_CTS)) 849 SET(bits, TIOCM_CTS); 850 if (ISSET(m, MSR_DSR)) 851 SET(bits, TIOCM_DSR); 852 if (ISSET(m, MSR_RI | MSR_TERI)) 853 SET(bits, TIOCM_RI); 854 if (bus_space_read_1(sc->sc_iot, sc->sc_ioh, com_ier)) 855 SET(bits, TIOCM_LE); 856 *(int *)data = bits; 857 break; 858 } 859 default: 860 return (ENOTTY); 861 } 862 863 #ifdef COM_DEBUG 864 if (com_debug) 865 comstatus(sc, "comioctl "); 866 #endif 867 868 return (0); 869 } 870 871 integrate void 872 com_schedrx(sc) 873 struct com_softc *sc; 874 { 875 876 sc->sc_rx_ready = 1; 877 878 /* Wake up the poller. */ 879 #ifdef __GENERIC_SOFT_INTERRUPTS 880 softintr_schedule(sc->sc_si); 881 #else 882 #ifndef alpha 883 setsoftserial(); 884 #else 885 if (!com_softintr_scheduled) { 886 com_softintr_scheduled = 1; 887 timeout(comsoft, NULL, 1); 888 } 889 #endif 890 #endif 891 } 892 893 void 894 com_break(sc, onoff) 895 struct com_softc *sc; 896 int onoff; 897 { 898 int s; 899 900 s = splserial(); 901 if (onoff) 902 SET(sc->sc_lcr, LCR_SBREAK); 903 else 904 CLR(sc->sc_lcr, LCR_SBREAK); 905 906 if (!sc->sc_heldchange) { 907 if (sc->sc_tx_busy) { 908 sc->sc_heldtbc = sc->sc_tbc; 909 sc->sc_tbc = 0; 910 sc->sc_heldchange = 1; 911 } else 912 com_loadchannelregs(sc); 913 } 914 splx(s); 915 } 916 917 void 918 com_modem(sc, onoff) 919 struct com_softc *sc; 920 int onoff; 921 { 922 int s; 923 924 s = splserial(); 925 if (onoff) 926 SET(sc->sc_mcr, sc->sc_mcr_dtr); 927 else 928 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 929 930 if (!sc->sc_heldchange) { 931 if (sc->sc_tx_busy) { 932 sc->sc_heldtbc = sc->sc_tbc; 933 sc->sc_tbc = 0; 934 sc->sc_heldchange = 1; 935 } else 936 com_loadchannelregs(sc); 937 } 938 splx(s); 939 } 940 941 static u_char 942 cflag2lcr(cflag) 943 tcflag_t cflag; 944 { 945 u_char lcr = 0; 946 947 switch (ISSET(cflag, CSIZE)) { 948 case CS5: 949 SET(lcr, LCR_5BITS); 950 break; 951 case CS6: 952 SET(lcr, LCR_6BITS); 953 break; 954 case CS7: 955 SET(lcr, LCR_7BITS); 956 break; 957 case CS8: 958 SET(lcr, LCR_8BITS); 959 break; 960 } 961 if (ISSET(cflag, PARENB)) { 962 SET(lcr, LCR_PENAB); 963 if (!ISSET(cflag, PARODD)) 964 SET(lcr, LCR_PEVEN); 965 } 966 if (ISSET(cflag, CSTOPB)) 967 SET(lcr, LCR_STOPB); 968 969 return (lcr); 970 } 971 972 int 973 comparam(tp, t) 974 struct tty *tp; 975 struct termios *t; 976 { 977 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 978 int ospeed = comspeed(t->c_ospeed, sc->sc_frequency); 979 u_char lcr; 980 int s; 981 982 /* Check requested parameters. */ 983 if (ospeed < 0) 984 return (EINVAL); 985 if (t->c_ispeed && t->c_ispeed != t->c_ospeed) 986 return (EINVAL); 987 988 /* 989 * For the console, always force CLOCAL and !HUPCL, so that the port 990 * is always active. 991 */ 992 if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) || 993 ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 994 SET(t->c_cflag, CLOCAL); 995 CLR(t->c_cflag, HUPCL); 996 } 997 998 /* 999 * If there were no changes, don't do anything. This avoids dropping 1000 * input and improves performance when all we did was frob things like 1001 * VMIN and VTIME. 1002 */ 1003 if (tp->t_ospeed == t->c_ospeed && 1004 tp->t_cflag == t->c_cflag) 1005 return (0); 1006 1007 lcr = ISSET(sc->sc_lcr, LCR_SBREAK) | cflag2lcr(t->c_cflag); 1008 1009 s = splserial(); 1010 1011 sc->sc_lcr = lcr; 1012 1013 /* 1014 * If we're not in a mode that assumes a connection is present, then 1015 * ignore carrier changes. 1016 */ 1017 if (ISSET(t->c_cflag, CLOCAL | MDMBUF)) 1018 sc->sc_msr_dcd = 0; 1019 else 1020 sc->sc_msr_dcd = MSR_DCD; 1021 /* 1022 * Set the flow control pins depending on the current flow control 1023 * mode. 1024 */ 1025 if (ISSET(t->c_cflag, CRTSCTS)) { 1026 sc->sc_mcr_dtr = MCR_DTR; 1027 sc->sc_mcr_rts = MCR_RTS; 1028 sc->sc_msr_cts = MSR_CTS; 1029 sc->sc_efr = EFR_AUTORTS | EFR_AUTOCTS; 1030 } else if (ISSET(t->c_cflag, MDMBUF)) { 1031 /* 1032 * For DTR/DCD flow control, make sure we don't toggle DTR for 1033 * carrier detection. 1034 */ 1035 sc->sc_mcr_dtr = 0; 1036 sc->sc_mcr_rts = MCR_DTR; 1037 sc->sc_msr_cts = MSR_DCD; 1038 sc->sc_efr = 0; 1039 } else { 1040 /* 1041 * If no flow control, then always set RTS. This will make 1042 * the other side happy if it mistakenly thinks we're doing 1043 * RTS/CTS flow control. 1044 */ 1045 sc->sc_mcr_dtr = MCR_DTR | MCR_RTS; 1046 sc->sc_mcr_rts = 0; 1047 sc->sc_msr_cts = 0; 1048 sc->sc_efr = 0; 1049 if (ISSET(sc->sc_mcr, MCR_DTR)) 1050 SET(sc->sc_mcr, MCR_RTS); 1051 else 1052 CLR(sc->sc_mcr, MCR_RTS); 1053 } 1054 sc->sc_msr_mask = sc->sc_msr_cts | sc->sc_msr_dcd; 1055 1056 #if 0 1057 if (ospeed == 0) 1058 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 1059 else 1060 SET(sc->sc_mcr, sc->sc_mcr_dtr); 1061 #endif 1062 1063 sc->sc_dlbl = ospeed; 1064 sc->sc_dlbh = ospeed >> 8; 1065 1066 /* 1067 * Set the FIFO threshold based on the receive speed. 1068 * 1069 * * If it's a low speed, it's probably a mouse or some other 1070 * interactive device, so set the threshold low. 1071 * * If it's a high speed, trim the trigger level down to prevent 1072 * overflows. 1073 * * Otherwise set it a bit higher. 1074 */ 1075 if (ISSET(sc->sc_hwflags, COM_HW_HAYESP)) 1076 sc->sc_fifo = FIFO_DMA_MODE | FIFO_ENABLE | FIFO_TRIGGER_8; 1077 else if (ISSET(sc->sc_hwflags, COM_HW_FIFO)) 1078 sc->sc_fifo = FIFO_ENABLE | 1079 (t->c_ospeed <= 1200 ? FIFO_TRIGGER_1 : 1080 t->c_ospeed <= 38400 ? FIFO_TRIGGER_8 : FIFO_TRIGGER_4); 1081 else 1082 sc->sc_fifo = 0; 1083 1084 /* And copy to tty. */ 1085 tp->t_ispeed = 0; 1086 tp->t_ospeed = t->c_ospeed; 1087 tp->t_cflag = t->c_cflag; 1088 1089 if (!sc->sc_heldchange) { 1090 if (sc->sc_tx_busy) { 1091 sc->sc_heldtbc = sc->sc_tbc; 1092 sc->sc_tbc = 0; 1093 sc->sc_heldchange = 1; 1094 } else 1095 com_loadchannelregs(sc); 1096 } 1097 1098 if (!ISSET(t->c_cflag, CHWFLOW)) { 1099 /* Disable the high water mark. */ 1100 sc->sc_r_hiwat = 0; 1101 sc->sc_r_lowat = 0; 1102 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1103 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1104 com_schedrx(sc); 1105 } 1106 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 1107 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 1108 com_hwiflow(sc); 1109 } 1110 } else { 1111 sc->sc_r_hiwat = com_rbuf_hiwat; 1112 sc->sc_r_lowat = com_rbuf_lowat; 1113 } 1114 1115 splx(s); 1116 1117 /* 1118 * Update the tty layer's idea of the carrier bit, in case we changed 1119 * CLOCAL or MDMBUF. We don't hang up here; we only do that by 1120 * explicit request. 1121 */ 1122 (void) (*linesw[tp->t_line].l_modem)(tp, ISSET(sc->sc_msr, MSR_DCD)); 1123 1124 #ifdef COM_DEBUG 1125 if (com_debug) 1126 comstatus(sc, "comparam "); 1127 #endif 1128 1129 if (!ISSET(t->c_cflag, CHWFLOW)) { 1130 if (sc->sc_tx_stopped) { 1131 sc->sc_tx_stopped = 0; 1132 comstart(tp); 1133 } 1134 } 1135 1136 return (0); 1137 } 1138 1139 void 1140 com_iflush(sc) 1141 struct com_softc *sc; 1142 { 1143 bus_space_tag_t iot = sc->sc_iot; 1144 bus_space_handle_t ioh = sc->sc_ioh; 1145 1146 /* flush any pending I/O */ 1147 while (ISSET(bus_space_read_1(iot, ioh, com_lsr), LSR_RXRDY)) 1148 (void) bus_space_read_1(iot, ioh, com_data); 1149 } 1150 1151 void 1152 com_loadchannelregs(sc) 1153 struct com_softc *sc; 1154 { 1155 bus_space_tag_t iot = sc->sc_iot; 1156 bus_space_handle_t ioh = sc->sc_ioh; 1157 1158 /* XXXXX necessary? */ 1159 com_iflush(sc); 1160 1161 bus_space_write_1(iot, ioh, com_ier, 0); 1162 1163 if (ISSET(sc->sc_hwflags, COM_HW_FLOW)) { 1164 bus_space_write_1(iot, ioh, com_lcr, LCR_EERS); 1165 bus_space_write_1(iot, ioh, com_efr, sc->sc_efr); 1166 } 1167 bus_space_write_1(iot, ioh, com_lcr, sc->sc_lcr | LCR_DLAB); 1168 bus_space_write_1(iot, ioh, com_dlbl, sc->sc_dlbl); 1169 bus_space_write_1(iot, ioh, com_dlbh, sc->sc_dlbh); 1170 bus_space_write_1(iot, ioh, com_lcr, sc->sc_lcr); 1171 bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr_active = sc->sc_mcr); 1172 bus_space_write_1(iot, ioh, com_fifo, sc->sc_fifo); 1173 1174 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1175 } 1176 1177 int 1178 comhwiflow(tp, block) 1179 struct tty *tp; 1180 int block; 1181 { 1182 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1183 int s; 1184 1185 if (sc->sc_mcr_rts == 0) 1186 return (0); 1187 1188 s = splserial(); 1189 if (block) { 1190 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1191 SET(sc->sc_rx_flags, RX_TTY_BLOCKED); 1192 com_hwiflow(sc); 1193 } 1194 } else { 1195 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1196 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1197 com_schedrx(sc); 1198 } 1199 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1200 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED); 1201 com_hwiflow(sc); 1202 } 1203 } 1204 splx(s); 1205 return (1); 1206 } 1207 1208 /* 1209 * (un)block input via hw flowcontrol 1210 */ 1211 void 1212 com_hwiflow(sc) 1213 struct com_softc *sc; 1214 { 1215 bus_space_tag_t iot = sc->sc_iot; 1216 bus_space_handle_t ioh = sc->sc_ioh; 1217 1218 if (sc->sc_mcr_rts == 0) 1219 return; 1220 1221 if (ISSET(sc->sc_rx_flags, RX_ANY_BLOCK)) { 1222 CLR(sc->sc_mcr, sc->sc_mcr_rts); 1223 CLR(sc->sc_mcr_active, sc->sc_mcr_rts); 1224 } else { 1225 SET(sc->sc_mcr, sc->sc_mcr_rts); 1226 SET(sc->sc_mcr_active, sc->sc_mcr_rts); 1227 } 1228 bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr_active); 1229 } 1230 1231 1232 void 1233 comstart(tp) 1234 struct tty *tp; 1235 { 1236 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1237 bus_space_tag_t iot = sc->sc_iot; 1238 bus_space_handle_t ioh = sc->sc_ioh; 1239 int s; 1240 1241 s = spltty(); 1242 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 1243 goto out; 1244 if (sc->sc_tx_stopped) 1245 goto out; 1246 1247 if (tp->t_outq.c_cc <= tp->t_lowat) { 1248 if (ISSET(tp->t_state, TS_ASLEEP)) { 1249 CLR(tp->t_state, TS_ASLEEP); 1250 wakeup(&tp->t_outq); 1251 } 1252 selwakeup(&tp->t_wsel); 1253 if (tp->t_outq.c_cc == 0) 1254 goto out; 1255 } 1256 1257 /* Grab the first contiguous region of buffer space. */ 1258 { 1259 u_char *tba; 1260 int tbc; 1261 1262 tba = tp->t_outq.c_cf; 1263 tbc = ndqb(&tp->t_outq, 0); 1264 1265 (void)splserial(); 1266 1267 sc->sc_tba = tba; 1268 sc->sc_tbc = tbc; 1269 } 1270 1271 SET(tp->t_state, TS_BUSY); 1272 sc->sc_tx_busy = 1; 1273 1274 /* Enable transmit completion interrupts if necessary. */ 1275 if (!ISSET(sc->sc_ier, IER_ETXRDY)) { 1276 SET(sc->sc_ier, IER_ETXRDY); 1277 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1278 } 1279 1280 /* Output the first chunk of the contiguous buffer. */ 1281 { 1282 int n; 1283 1284 n = sc->sc_tbc; 1285 if (n > sc->sc_fifolen) 1286 n = sc->sc_fifolen; 1287 bus_space_write_multi_1(iot, ioh, com_data, sc->sc_tba, n); 1288 sc->sc_tbc -= n; 1289 sc->sc_tba += n; 1290 } 1291 out: 1292 splx(s); 1293 return; 1294 } 1295 1296 /* 1297 * Stop output on a line. 1298 */ 1299 void 1300 comstop(tp, flag) 1301 struct tty *tp; 1302 int flag; 1303 { 1304 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1305 int s; 1306 1307 s = splserial(); 1308 if (ISSET(tp->t_state, TS_BUSY)) { 1309 /* Stop transmitting at the next chunk. */ 1310 sc->sc_tbc = 0; 1311 sc->sc_heldtbc = 0; 1312 if (!ISSET(tp->t_state, TS_TTSTOP)) 1313 SET(tp->t_state, TS_FLUSH); 1314 } 1315 splx(s); 1316 } 1317 1318 void 1319 comdiag(arg) 1320 void *arg; 1321 { 1322 struct com_softc *sc = arg; 1323 int overflows, floods; 1324 int s; 1325 1326 s = splserial(); 1327 overflows = sc->sc_overflows; 1328 sc->sc_overflows = 0; 1329 floods = sc->sc_floods; 1330 sc->sc_floods = 0; 1331 sc->sc_errors = 0; 1332 splx(s); 1333 1334 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1335 sc->sc_dev.dv_xname, 1336 overflows, overflows == 1 ? "" : "s", 1337 floods, floods == 1 ? "" : "s"); 1338 } 1339 1340 integrate void 1341 com_rxsoft(sc, tp) 1342 struct com_softc *sc; 1343 struct tty *tp; 1344 { 1345 int (*rint) __P((int c, struct tty *tp)) = linesw[tp->t_line].l_rint; 1346 u_char *get, *end; 1347 u_int cc, scc; 1348 u_char lsr; 1349 int code; 1350 int s; 1351 1352 end = sc->sc_ebuf; 1353 get = sc->sc_rbget; 1354 scc = cc = com_rbuf_size - sc->sc_rbavail; 1355 1356 if (cc == com_rbuf_size) { 1357 sc->sc_floods++; 1358 if (sc->sc_errors++ == 0) 1359 timeout(comdiag, sc, 60 * hz); 1360 } 1361 1362 while (cc) { 1363 code = get[0]; 1364 lsr = get[1]; 1365 if (ISSET(lsr, LSR_OE | LSR_BI | LSR_FE | LSR_PE)) { 1366 if (ISSET(lsr, LSR_OE)) { 1367 sc->sc_overflows++; 1368 if (sc->sc_errors++ == 0) 1369 timeout(comdiag, sc, 60 * hz); 1370 } 1371 if (ISSET(lsr, LSR_BI | LSR_FE)) 1372 SET(code, TTY_FE); 1373 if (ISSET(lsr, LSR_PE)) 1374 SET(code, TTY_PE); 1375 } 1376 if ((*rint)(code, tp) == -1) { 1377 /* 1378 * The line discipline's buffer is out of space. 1379 */ 1380 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1381 /* 1382 * We're either not using flow control, or the 1383 * line discipline didn't tell us to block for 1384 * some reason. Either way, we have no way to 1385 * know when there's more space available, so 1386 * just drop the rest of the data. 1387 */ 1388 get += cc << 1; 1389 if (get >= end) 1390 get -= com_rbuf_size << 1; 1391 cc = 0; 1392 } else { 1393 /* 1394 * Don't schedule any more receive processing 1395 * until the line discipline tells us there's 1396 * space available (through comhwiflow()). 1397 * Leave the rest of the data in the input 1398 * buffer. 1399 */ 1400 SET(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1401 } 1402 break; 1403 } 1404 get += 2; 1405 if (get >= end) 1406 get = sc->sc_rbuf; 1407 cc--; 1408 } 1409 1410 if (cc != scc) { 1411 sc->sc_rbget = get; 1412 s = splserial(); 1413 cc = sc->sc_rbavail += scc - cc; 1414 /* Buffers should be ok again, release possible block. */ 1415 if (cc >= sc->sc_r_lowat) { 1416 if (ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1417 CLR(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1418 SET(sc->sc_ier, IER_ERXRDY); 1419 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 1420 } 1421 if (ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED)) { 1422 CLR(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1423 com_hwiflow(sc); 1424 } 1425 } 1426 splx(s); 1427 } 1428 } 1429 1430 integrate void 1431 com_txsoft(sc, tp) 1432 struct com_softc *sc; 1433 struct tty *tp; 1434 { 1435 1436 CLR(tp->t_state, TS_BUSY); 1437 if (ISSET(tp->t_state, TS_FLUSH)) 1438 CLR(tp->t_state, TS_FLUSH); 1439 else 1440 ndflush(&tp->t_outq, (int)(sc->sc_tba - tp->t_outq.c_cf)); 1441 (*linesw[tp->t_line].l_start)(tp); 1442 } 1443 1444 integrate void 1445 com_stsoft(sc, tp) 1446 struct com_softc *sc; 1447 struct tty *tp; 1448 { 1449 u_char msr, delta; 1450 int s; 1451 1452 s = splserial(); 1453 msr = sc->sc_msr; 1454 delta = sc->sc_msr_delta; 1455 sc->sc_msr_delta = 0; 1456 splx(s); 1457 1458 if (ISSET(delta, sc->sc_msr_dcd)) { 1459 /* 1460 * Inform the tty layer that carrier detect changed. 1461 */ 1462 (void) (*linesw[tp->t_line].l_modem)(tp, ISSET(msr, MSR_DCD)); 1463 } 1464 1465 if (ISSET(delta, sc->sc_msr_cts)) { 1466 /* Block or unblock output according to flow control. */ 1467 if (ISSET(msr, sc->sc_msr_cts)) { 1468 sc->sc_tx_stopped = 0; 1469 (*linesw[tp->t_line].l_start)(tp); 1470 } else { 1471 sc->sc_tx_stopped = 1; 1472 } 1473 } 1474 1475 #ifdef COM_DEBUG 1476 if (com_debug) 1477 comstatus(sc, "com_stsoft"); 1478 #endif 1479 } 1480 1481 #ifdef __GENERIC_SOFT_INTERRUPTS 1482 void 1483 comsoft(arg) 1484 void *arg; 1485 { 1486 struct com_softc *sc = arg; 1487 struct tty *tp; 1488 1489 { 1490 #else 1491 void 1492 #ifndef alpha 1493 comsoft() 1494 #else 1495 comsoft(arg) 1496 void *arg; 1497 #endif 1498 { 1499 struct com_softc *sc; 1500 struct tty *tp; 1501 int unit; 1502 #ifdef alpha 1503 int s; 1504 1505 s = splsoftserial(); 1506 com_softintr_scheduled = 0; 1507 #endif 1508 1509 for (unit = 0; unit < com_cd.cd_ndevs; unit++) { 1510 sc = com_cd.cd_devs[unit]; 1511 if (sc == NULL) 1512 continue; 1513 1514 tp = sc->sc_tty; 1515 if (tp == NULL || !ISSET(tp->t_state, TS_ISOPEN | TS_WOPEN)) 1516 continue; 1517 #endif 1518 tp = sc->sc_tty; 1519 1520 if (sc->sc_rx_ready) { 1521 sc->sc_rx_ready = 0; 1522 com_rxsoft(sc, tp); 1523 } 1524 1525 if (sc->sc_st_check) { 1526 sc->sc_st_check = 0; 1527 com_stsoft(sc, tp); 1528 } 1529 1530 if (sc->sc_tx_done) { 1531 sc->sc_tx_done = 0; 1532 com_txsoft(sc, tp); 1533 } 1534 } 1535 1536 #ifndef __GENERIC_SOFT_INTERRUPTS 1537 #ifdef alpha 1538 splx(s); 1539 #endif 1540 #endif 1541 } 1542 1543 int 1544 comintr(arg) 1545 void *arg; 1546 { 1547 struct com_softc *sc = arg; 1548 bus_space_tag_t iot = sc->sc_iot; 1549 bus_space_handle_t ioh = sc->sc_ioh; 1550 u_char *put, *end; 1551 u_int cc; 1552 u_char lsr, iir; 1553 1554 iir = bus_space_read_1(iot, ioh, com_iir); 1555 if (ISSET(iir, IIR_NOPEND)) 1556 return (0); 1557 1558 end = sc->sc_ebuf; 1559 put = sc->sc_rbput; 1560 cc = sc->sc_rbavail; 1561 1562 do { 1563 u_char msr, delta; 1564 1565 lsr = bus_space_read_1(iot, ioh, com_lsr); 1566 #if defined(DDB) || defined(KGDB) 1567 if (ISSET(lsr, LSR_BI)) { 1568 #ifdef DDB 1569 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 1570 Debugger(); 1571 continue; 1572 } 1573 #endif 1574 #ifdef KGDB 1575 if (ISSET(sc->sc_hwflags, COM_HW_KGDB)) { 1576 kgdb_connect(1); 1577 continue; 1578 } 1579 #endif 1580 } 1581 #endif /* DDB || KGDB */ 1582 1583 if (ISSET(lsr, LSR_RCV_MASK) && 1584 !ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1585 while (cc > 0) { 1586 put[0] = bus_space_read_1(iot, ioh, com_data); 1587 put[1] = lsr; 1588 put += 2; 1589 if (put >= end) 1590 put = sc->sc_rbuf; 1591 cc--; 1592 1593 lsr = bus_space_read_1(iot, ioh, com_lsr); 1594 if (!ISSET(lsr, LSR_RCV_MASK)) 1595 break; 1596 } 1597 1598 /* 1599 * Current string of incoming characters ended because 1600 * no more data was available or we ran out of space. 1601 * Schedule a receive event if any data was received. 1602 * If we're out of space, turn off receive interrupts. 1603 */ 1604 sc->sc_rbput = put; 1605 sc->sc_rbavail = cc; 1606 if (!ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) 1607 sc->sc_rx_ready = 1; 1608 1609 /* 1610 * See if we are in danger of overflowing a buffer. If 1611 * so, use hardware flow control to ease the pressure. 1612 */ 1613 if (!ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED) && 1614 cc < sc->sc_r_hiwat) { 1615 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1616 com_hwiflow(sc); 1617 } 1618 1619 /* 1620 * If we're out of space, disable receive interrupts 1621 * until the queue has drained a bit. 1622 */ 1623 if (!cc) { 1624 SET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1625 CLR(sc->sc_ier, IER_ERXRDY); 1626 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1627 } 1628 } else { 1629 if ((iir & IIR_IMASK) == IIR_RXRDY) { 1630 bus_space_write_1(iot, ioh, com_ier, 0); 1631 delay(10); 1632 bus_space_write_1(iot, ioh, com_ier,sc->sc_ier); 1633 iir = IIR_NOPEND; 1634 continue; 1635 } 1636 } 1637 1638 msr = bus_space_read_1(iot, ioh, com_msr); 1639 delta = msr ^ sc->sc_msr; 1640 sc->sc_msr = msr; 1641 if (ISSET(delta, sc->sc_msr_mask)) { 1642 SET(sc->sc_msr_delta, delta); 1643 1644 /* 1645 * Stop output immediately if we lose the output 1646 * flow control signal or carrier detect. 1647 */ 1648 if (ISSET(~msr, sc->sc_msr_mask)) { 1649 sc->sc_tbc = 0; 1650 sc->sc_heldtbc = 0; 1651 #ifdef COM_DEBUG 1652 if (com_debug) 1653 comstatus(sc, "comintr "); 1654 #endif 1655 } 1656 1657 sc->sc_st_check = 1; 1658 } 1659 } while (!ISSET((iir = bus_space_read_1(iot, ioh, com_iir)), IIR_NOPEND)); 1660 1661 /* 1662 * Done handling any receive interrupts. See if data can be 1663 * transmitted as well. Schedule tx done event if no data left 1664 * and tty was marked busy. 1665 */ 1666 if (ISSET(lsr, LSR_TXRDY)) { 1667 /* 1668 * If we've delayed a parameter change, do it now, and restart 1669 * output. 1670 */ 1671 if (sc->sc_heldchange) { 1672 com_loadchannelregs(sc); 1673 sc->sc_heldchange = 0; 1674 sc->sc_tbc = sc->sc_heldtbc; 1675 sc->sc_heldtbc = 0; 1676 } 1677 1678 /* Output the next chunk of the contiguous buffer, if any. */ 1679 if (sc->sc_tbc > 0) { 1680 int n; 1681 1682 n = sc->sc_tbc; 1683 if (n > sc->sc_fifolen) 1684 n = sc->sc_fifolen; 1685 bus_space_write_multi_1(iot, ioh, com_data, sc->sc_tba, n); 1686 sc->sc_tbc -= n; 1687 sc->sc_tba += n; 1688 } else { 1689 /* Disable transmit completion interrupts if necessary. */ 1690 if (ISSET(sc->sc_ier, IER_ETXRDY)) { 1691 CLR(sc->sc_ier, IER_ETXRDY); 1692 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1693 } 1694 if (sc->sc_tx_busy) { 1695 sc->sc_tx_busy = 0; 1696 sc->sc_tx_done = 1; 1697 } 1698 } 1699 } 1700 1701 /* Wake up the poller. */ 1702 #ifdef __GENERIC_SOFT_INTERRUPTS 1703 softintr_schedule(sc->sc_si); 1704 #else 1705 #ifndef alpha 1706 setsoftserial(); 1707 #else 1708 if (!com_softintr_scheduled) { 1709 com_softintr_scheduled = 1; 1710 timeout(comsoft, NULL, 1); 1711 } 1712 #endif 1713 #endif 1714 1715 #if NRND > 0 && defined(RND_COM) 1716 rnd_add_uint32(&sc->rnd_source, iir | lsr); 1717 #endif 1718 1719 return (1); 1720 } 1721 1722 /* 1723 * The following functions are polled getc and putc routines, shared 1724 * by the console and kgdb glue. 1725 */ 1726 1727 int 1728 com_common_getc(iot, ioh) 1729 bus_space_tag_t iot; 1730 bus_space_handle_t ioh; 1731 { 1732 int s = splserial(); 1733 u_char stat, c; 1734 1735 while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_RXRDY)) 1736 ; 1737 c = bus_space_read_1(iot, ioh, com_data); 1738 stat = bus_space_read_1(iot, ioh, com_iir); 1739 splx(s); 1740 return (c); 1741 } 1742 1743 void 1744 com_common_putc(iot, ioh, c) 1745 bus_space_tag_t iot; 1746 bus_space_handle_t ioh; 1747 int c; 1748 { 1749 int s = splserial(); 1750 u_char stat; 1751 int timo; 1752 1753 /* wait for any pending transmission to finish */ 1754 timo = 50000; 1755 while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_TXRDY) 1756 && --timo) 1757 ; 1758 bus_space_write_1(iot, ioh, com_data, c); 1759 /* wait for this transmission to complete */ 1760 timo = 1500000; 1761 while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_TXRDY) 1762 && --timo) 1763 ; 1764 /* clear any interrupts generated by this transmission */ 1765 stat = bus_space_read_1(iot, ioh, com_iir); 1766 splx(s); 1767 } 1768 1769 /* 1770 * Initialize UART to known state. 1771 */ 1772 int 1773 cominit(iot, iobase, rate, frequency, cflag, iohp) 1774 bus_space_tag_t iot; 1775 int iobase; 1776 int rate, frequency; 1777 tcflag_t cflag; 1778 bus_space_handle_t *iohp; 1779 { 1780 bus_space_handle_t ioh; 1781 1782 if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) 1783 return (ENOMEM); /* ??? */ 1784 1785 bus_space_write_1(iot, ioh, com_lcr, LCR_EERS); 1786 bus_space_write_1(iot, ioh, com_efr, 0); 1787 bus_space_write_1(iot, ioh, com_lcr, LCR_DLAB); 1788 rate = comspeed(rate, frequency); 1789 bus_space_write_1(iot, ioh, com_dlbl, rate); 1790 bus_space_write_1(iot, ioh, com_dlbh, rate >> 8); 1791 bus_space_write_1(iot, ioh, com_lcr, cflag2lcr(cflag)); 1792 bus_space_write_1(iot, ioh, com_mcr, 0); 1793 bus_space_write_1(iot, ioh, com_fifo, 1794 FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_1); 1795 bus_space_write_1(iot, ioh, com_ier, 0); 1796 1797 *iohp = ioh; 1798 return (0); 1799 } 1800 1801 /* 1802 * Following are all routines needed for COM to act as console 1803 */ 1804 1805 int 1806 comcnattach(iot, iobase, rate, frequency, cflag) 1807 bus_space_tag_t iot; 1808 int iobase; 1809 int rate, frequency; 1810 tcflag_t cflag; 1811 { 1812 int res; 1813 static struct consdev comcons = { 1814 NULL, NULL, comcngetc, comcnputc, comcnpollc, NODEV, CN_NORMAL 1815 }; 1816 1817 res = cominit(iot, iobase, rate, frequency, cflag, &comconsioh); 1818 if (res) 1819 return (res); 1820 1821 cn_tab = &comcons; 1822 1823 comconstag = iot; 1824 comconsaddr = iobase; 1825 comconsrate = rate; 1826 comconscflag = cflag; 1827 1828 return (0); 1829 } 1830 1831 int 1832 comcngetc(dev) 1833 dev_t dev; 1834 { 1835 1836 return (com_common_getc(comconstag, comconsioh)); 1837 } 1838 1839 /* 1840 * Console kernel output character routine. 1841 */ 1842 void 1843 comcnputc(dev, c) 1844 dev_t dev; 1845 int c; 1846 { 1847 1848 com_common_putc(comconstag, comconsioh, c); 1849 } 1850 1851 void 1852 comcnpollc(dev, on) 1853 dev_t dev; 1854 int on; 1855 { 1856 1857 } 1858 1859 #ifdef KGDB 1860 int 1861 com_kgdb_attach(iot, iobase, rate, frequency, cflag) 1862 bus_space_tag_t iot; 1863 int iobase; 1864 int rate, frequency; 1865 tcflag_t cflag; 1866 { 1867 int res; 1868 1869 if (iot == comconstag && iobase == comconsaddr) 1870 return (EBUSY); /* cannot share with console */ 1871 1872 res = cominit(iot, iobase, rate, frequency, cflag, &com_kgdb_ioh); 1873 if (res) 1874 return (res); 1875 1876 kgdb_attach(com_kgdb_getc, com_kgdb_putc, NULL); 1877 kgdb_dev = 123; /* unneeded, only to satisfy some tests */ 1878 1879 com_kgdb_iot = iot; 1880 com_kgdb_addr = iobase; 1881 1882 return (0); 1883 } 1884 1885 /* ARGSUSED */ 1886 int 1887 com_kgdb_getc(arg) 1888 void *arg; 1889 { 1890 1891 return (com_common_getc(com_kgdb_iot, com_kgdb_ioh)); 1892 } 1893 1894 /* ARGSUSED */ 1895 void 1896 com_kgdb_putc(arg, c) 1897 void *arg; 1898 int c; 1899 { 1900 1901 return (com_common_putc(com_kgdb_iot, com_kgdb_ioh, c)); 1902 } 1903 #endif /* KGDB */ 1904 1905 /* helper function to identify the com ports used by 1906 console or KGDB (and not yet autoconf attached) */ 1907 int 1908 com_is_console(iot, iobase, ioh) 1909 bus_space_tag_t iot; 1910 int iobase; 1911 bus_space_handle_t *ioh; 1912 { 1913 bus_space_handle_t help; 1914 1915 if (!comconsattached && 1916 iot == comconstag && iobase == comconsaddr) 1917 help = comconsioh; 1918 #ifdef KGDB 1919 else if (!com_kgdb_attached && 1920 iot == com_kgdb_iot && iobase == com_kgdb_addr) 1921 help = com_kgdb_ioh; 1922 #endif 1923 else 1924 return (0); 1925 1926 if (ioh) 1927 *ioh = help; 1928 return (1); 1929 } 1930
Indexes created Tue Sep 23 07:09:52 GMT 2025