lpt.c revision 1.42
1 /* $NetBSD: lpt.c,v 1.42 1996/10/21 22:41:14 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 1993, 1994 Charles Hannum. 5 * Copyright (c) 1990 William F. Jolitz, TeleMuse 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This software is a component of "386BSD" developed by 19 * William F. Jolitz, TeleMuse. 20 * 4. Neither the name of the developer nor the name "386BSD" 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS A COMPONENT OF 386BSD DEVELOPED BY WILLIAM F. JOLITZ 25 * AND IS INTENDED FOR RESEARCH AND EDUCATIONAL PURPOSES ONLY. THIS 26 * SOFTWARE SHOULD NOT BE CONSIDERED TO BE A COMMERCIAL PRODUCT. 27 * THE DEVELOPER URGES THAT USERS WHO REQUIRE A COMMERCIAL PRODUCT 28 * NOT MAKE USE OF THIS WORK. 29 * 30 * FOR USERS WHO WISH TO UNDERSTAND THE 386BSD SYSTEM DEVELOPED 31 * BY WILLIAM F. JOLITZ, WE RECOMMEND THE USER STUDY WRITTEN 32 * REFERENCES SUCH AS THE "PORTING UNIX TO THE 386" SERIES 33 * (BEGINNING JANUARY 1991 "DR. DOBBS JOURNAL", USA AND BEGINNING 34 * JUNE 1991 "UNIX MAGAZIN", GERMANY) BY WILLIAM F. JOLITZ AND 35 * LYNNE GREER JOLITZ, AS WELL AS OTHER BOOKS ON UNIX AND THE 36 * ON-LINE 386BSD USER MANUAL BEFORE USE. A BOOK DISCUSSING THE INTERNALS 37 * OF 386BSD ENTITLED "386BSD FROM THE INSIDE OUT" WILL BE AVAILABLE LATE 1992. 38 * 39 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPER ``AS IS'' AND 40 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 42 * ARE DISCLAIMED. IN NO EVENT SHALL THE DEVELOPER BE LIABLE 43 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 44 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 45 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 46 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 47 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 48 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 49 * SUCH DAMAGE. 50 */ 51 52 /* 53 * Device Driver for AT parallel printer port 54 */ 55 56 #include <sys/param.h> 57 #include <sys/systm.h> 58 #include <sys/proc.h> 59 #include <sys/user.h> 60 #include <sys/buf.h> 61 #include <sys/kernel.h> 62 #include <sys/ioctl.h> 63 #include <sys/uio.h> 64 #include <sys/device.h> 65 #include <sys/conf.h> 66 #include <sys/syslog.h> 67 68 #include <machine/bus.h> 69 #include <machine/intr.h> 70 71 #include <dev/isa/isavar.h> 72 #include <dev/isa/lptreg.h> 73 74 #define TIMEOUT hz*16 /* wait up to 16 seconds for a ready */ 75 #define STEP hz/4 76 77 #define LPTPRI (PZERO+8) 78 #define LPT_BSIZE 1024 79 80 #if !defined(DEBUG) || !defined(notdef) 81 #define LPRINTF(a) 82 #else 83 #define LPRINTF if (lptdebug) printf a 84 int lptdebug = 1; 85 #endif 86 87 struct lpt_softc { 88 struct device sc_dev; 89 void *sc_ih; 90 91 size_t sc_count; 92 struct buf *sc_inbuf; 93 u_char *sc_cp; 94 int sc_spinmax; 95 int sc_iobase; 96 bus_space_tag_t sc_iot; 97 bus_space_handle_t sc_ioh; 98 int sc_irq; 99 u_char sc_state; 100 #define LPT_OPEN 0x01 /* device is open */ 101 #define LPT_OBUSY 0x02 /* printer is busy doing output */ 102 #define LPT_INIT 0x04 /* waiting to initialize for open */ 103 u_char sc_flags; 104 #define LPT_AUTOLF 0x20 /* automatic LF on CR */ 105 #define LPT_NOPRIME 0x40 /* don't prime on open */ 106 #define LPT_NOINTR 0x80 /* do not use interrupt */ 107 u_char sc_control; 108 u_char sc_laststatus; 109 }; 110 111 /* XXX does not belong here */ 112 cdev_decl(lpt); 113 114 int lptprobe __P((struct device *, void *, void *)); 115 void lptattach __P((struct device *, struct device *, void *)); 116 int lptintr __P((void *)); 117 118 struct cfattach lpt_ca = { 119 sizeof(struct lpt_softc), lptprobe, lptattach 120 }; 121 122 struct cfdriver lpt_cd = { 123 NULL, "lpt", DV_TTY 124 }; 125 126 #define LPTUNIT(s) (minor(s) & 0x1f) 127 #define LPTFLAGS(s) (minor(s) & 0xe0) 128 129 #define LPS_INVERT (LPS_SELECT|LPS_NERR|LPS_NBSY|LPS_NACK) 130 #define LPS_MASK (LPS_SELECT|LPS_NERR|LPS_NBSY|LPS_NACK|LPS_NOPAPER) 131 #define NOT_READY() ((bus_space_read_1(iot, ioh, lpt_status) ^ LPS_INVERT) & LPS_MASK) 132 #define NOT_READY_ERR() not_ready(bus_space_read_1(iot, ioh, lpt_status), sc) 133 static int not_ready __P((u_char, struct lpt_softc *)); 134 135 static void lptwakeup __P((void *arg)); 136 static int pushbytes __P((struct lpt_softc *)); 137 138 int lpt_port_test __P((bus_space_tag_t, bus_space_handle_t, bus_addr_t, 139 bus_size_t, u_char, u_char)); 140 141 /* 142 * Internal routine to lptprobe to do port tests of one byte value. 143 */ 144 int 145 lpt_port_test(iot, ioh, base, off, data, mask) 146 bus_space_tag_t iot; 147 bus_space_handle_t ioh; 148 bus_addr_t base; 149 bus_size_t off; 150 u_char data, mask; 151 { 152 int timeout; 153 u_char temp; 154 155 data &= mask; 156 bus_space_write_1(iot, ioh, off, data); 157 timeout = 1000; 158 do { 159 delay(10); 160 temp = bus_space_read_1(iot, ioh, off) & mask; 161 } while (temp != data && --timeout); 162 LPRINTF(("lpt: port=0x%x out=0x%x in=0x%x timeout=%d\n", base + off, 163 data, temp, timeout)); 164 return (temp == data); 165 } 166 167 /* 168 * Logic: 169 * 1) You should be able to write to and read back the same value 170 * to the data port. Do an alternating zeros, alternating ones, 171 * walking zero, and walking one test to check for stuck bits. 172 * 173 * 2) You should be able to write to and read back the same value 174 * to the control port lower 5 bits, the upper 3 bits are reserved 175 * per the IBM PC technical reference manauls and different boards 176 * do different things with them. Do an alternating zeros, alternating 177 * ones, walking zero, and walking one test to check for stuck bits. 178 * 179 * Some printers drag the strobe line down when the are powered off 180 * so this bit has been masked out of the control port test. 181 * 182 * XXX Some printers may not like a fast pulse on init or strobe, I 183 * don't know at this point, if that becomes a problem these bits 184 * should be turned off in the mask byte for the control port test. 185 * 186 * 3) Set the data and control ports to a value of 0 187 */ 188 int 189 lptprobe(parent, match, aux) 190 struct device *parent; 191 void *match, *aux; 192 { 193 struct isa_attach_args *ia = aux; 194 bus_space_tag_t iot; 195 bus_space_handle_t ioh; 196 u_long base; 197 u_char mask, data; 198 int i, rv; 199 200 #ifdef DEBUG 201 #define ABORT do {printf("lptprobe: mask %x data %x failed\n", mask, data); \ 202 goto out;} while (0) 203 #else 204 #define ABORT goto out 205 #endif 206 207 iot = ia->ia_iot; 208 base = ia->ia_iobase; 209 if (bus_space_map(iot, base, LPT_NPORTS, 0, &ioh)) 210 return 0; 211 212 rv = 0; 213 mask = 0xff; 214 215 data = 0x55; /* Alternating zeros */ 216 if (!lpt_port_test(iot, ioh, base, lpt_data, data, mask)) 217 ABORT; 218 219 data = 0xaa; /* Alternating ones */ 220 if (!lpt_port_test(iot, ioh, base, lpt_data, data, mask)) 221 ABORT; 222 223 for (i = 0; i < CHAR_BIT; i++) { /* Walking zero */ 224 data = ~(1 << i); 225 if (!lpt_port_test(iot, ioh, base, lpt_data, data, mask)) 226 ABORT; 227 } 228 229 for (i = 0; i < CHAR_BIT; i++) { /* Walking one */ 230 data = (1 << i); 231 if (!lpt_port_test(iot, ioh, base, lpt_data, data, mask)) 232 ABORT; 233 } 234 235 bus_space_write_1(iot, ioh, lpt_data, 0); 236 bus_space_write_1(iot, ioh, lpt_control, 0); 237 238 ia->ia_iosize = LPT_NPORTS; 239 ia->ia_msize = 0; 240 241 rv = 1; 242 243 out: 244 bus_space_unmap(iot, ioh, LPT_NPORTS); 245 return rv; 246 } 247 248 void 249 lptattach(parent, self, aux) 250 struct device *parent, *self; 251 void *aux; 252 { 253 struct lpt_softc *sc = (void *)self; 254 struct isa_attach_args *ia = aux; 255 bus_space_tag_t iot; 256 bus_space_handle_t ioh; 257 258 if (ia->ia_irq != IRQUNK) 259 printf("\n"); 260 else 261 printf(": polled\n"); 262 263 sc->sc_iobase = ia->ia_iobase; 264 sc->sc_irq = ia->ia_irq; 265 sc->sc_state = 0; 266 267 iot = sc->sc_iot = ia->ia_iot; 268 if (bus_space_map(iot, sc->sc_iobase, LPT_NPORTS, 0, &ioh)) 269 panic("lptattach: couldn't map I/O ports"); 270 sc->sc_ioh = ioh; 271 272 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 273 274 if (ia->ia_irq != IRQUNK) 275 sc->sc_ih = isa_intr_establish(ia->ia_ic, ia->ia_irq, IST_EDGE, 276 IPL_TTY, lptintr, sc); 277 } 278 279 /* 280 * Reset the printer, then wait until it's selected and not busy. 281 */ 282 int 283 lptopen(dev, flag, mode, p) 284 dev_t dev; 285 int flag; 286 int mode; 287 struct proc *p; 288 { 289 int unit = LPTUNIT(dev); 290 u_char flags = LPTFLAGS(dev); 291 struct lpt_softc *sc; 292 bus_space_tag_t iot; 293 bus_space_handle_t ioh; 294 u_char control; 295 int error; 296 int spin; 297 298 if (unit >= lpt_cd.cd_ndevs) 299 return ENXIO; 300 sc = lpt_cd.cd_devs[unit]; 301 if (!sc) 302 return ENXIO; 303 304 if (sc->sc_irq == IRQUNK && (flags & LPT_NOINTR) == 0) 305 return ENXIO; 306 307 #ifdef DIAGNOSTIC 308 if (sc->sc_state) 309 printf("%s: stat=0x%x not zero\n", sc->sc_dev.dv_xname, 310 sc->sc_state); 311 #endif 312 313 if (sc->sc_state) 314 return EBUSY; 315 316 sc->sc_state = LPT_INIT; 317 sc->sc_flags = flags; 318 LPRINTF(("%s: open: flags=0x%x\n", sc->sc_dev.dv_xname, flags)); 319 iot = sc->sc_iot; 320 ioh = sc->sc_ioh; 321 322 if ((flags & LPT_NOPRIME) == 0) { 323 /* assert INIT for 100 usec to start up printer */ 324 bus_space_write_1(iot, ioh, lpt_control, LPC_SELECT); 325 delay(100); 326 } 327 328 control = LPC_SELECT | LPC_NINIT; 329 bus_space_write_1(iot, ioh, lpt_control, control); 330 331 /* wait till ready (printer running diagnostics) */ 332 for (spin = 0; NOT_READY_ERR(); spin += STEP) { 333 if (spin >= TIMEOUT) { 334 sc->sc_state = 0; 335 return EBUSY; 336 } 337 338 /* wait 1/4 second, give up if we get a signal */ 339 error = tsleep((caddr_t)sc, LPTPRI | PCATCH, "lptopen", STEP); 340 if (error != EWOULDBLOCK) { 341 sc->sc_state = 0; 342 return error; 343 } 344 } 345 346 if ((flags & LPT_NOINTR) == 0) 347 control |= LPC_IENABLE; 348 if (flags & LPT_AUTOLF) 349 control |= LPC_AUTOLF; 350 sc->sc_control = control; 351 bus_space_write_1(iot, ioh, lpt_control, control); 352 353 sc->sc_inbuf = geteblk(LPT_BSIZE); 354 sc->sc_count = 0; 355 sc->sc_state = LPT_OPEN; 356 357 if ((sc->sc_flags & LPT_NOINTR) == 0) 358 lptwakeup(sc); 359 360 LPRINTF(("%s: opened\n", sc->sc_dev.dv_xname)); 361 return 0; 362 } 363 364 int 365 not_ready(status, sc) 366 u_char status; 367 struct lpt_softc *sc; 368 { 369 u_char new; 370 371 status = (status ^ LPS_INVERT) & LPS_MASK; 372 new = status & ~sc->sc_laststatus; 373 sc->sc_laststatus = status; 374 375 if (new & LPS_SELECT) 376 log(LOG_NOTICE, "%s: offline\n", sc->sc_dev.dv_xname); 377 else if (new & LPS_NOPAPER) 378 log(LOG_NOTICE, "%s: out of paper\n", sc->sc_dev.dv_xname); 379 else if (new & LPS_NERR) 380 log(LOG_NOTICE, "%s: output error\n", sc->sc_dev.dv_xname); 381 382 return status; 383 } 384 385 void 386 lptwakeup(arg) 387 void *arg; 388 { 389 struct lpt_softc *sc = arg; 390 int s; 391 392 s = spltty(); 393 lptintr(sc); 394 splx(s); 395 396 timeout(lptwakeup, sc, STEP); 397 } 398 399 /* 400 * Close the device, and free the local line buffer. 401 */ 402 int 403 lptclose(dev, flag, mode, p) 404 dev_t dev; 405 int flag; 406 int mode; 407 struct proc *p; 408 { 409 int unit = LPTUNIT(dev); 410 struct lpt_softc *sc = lpt_cd.cd_devs[unit]; 411 bus_space_tag_t iot = sc->sc_iot; 412 bus_space_handle_t ioh = sc->sc_ioh; 413 414 if (sc->sc_count) 415 (void) pushbytes(sc); 416 417 if ((sc->sc_flags & LPT_NOINTR) == 0) 418 untimeout(lptwakeup, sc); 419 420 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 421 sc->sc_state = 0; 422 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 423 brelse(sc->sc_inbuf); 424 425 LPRINTF(("%s: closed\n", sc->sc_dev.dv_xname)); 426 return 0; 427 } 428 429 int 430 pushbytes(sc) 431 struct lpt_softc *sc; 432 { 433 bus_space_tag_t iot = sc->sc_iot; 434 bus_space_handle_t ioh = sc->sc_ioh; 435 int error; 436 437 if (sc->sc_flags & LPT_NOINTR) { 438 int spin, tic; 439 u_char control = sc->sc_control; 440 441 while (sc->sc_count > 0) { 442 spin = 0; 443 while (NOT_READY()) { 444 if (++spin < sc->sc_spinmax) 445 continue; 446 tic = 0; 447 /* adapt busy-wait algorithm */ 448 sc->sc_spinmax++; 449 while (NOT_READY_ERR()) { 450 /* exponential backoff */ 451 tic = tic + tic + 1; 452 if (tic > TIMEOUT) 453 tic = TIMEOUT; 454 error = tsleep((caddr_t)sc, 455 LPTPRI | PCATCH, "lptpsh", tic); 456 if (error != EWOULDBLOCK) 457 return error; 458 } 459 break; 460 } 461 462 bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++); 463 bus_space_write_1(iot, ioh, lpt_control, control | LPC_STROBE); 464 sc->sc_count--; 465 bus_space_write_1(iot, ioh, lpt_control, control); 466 467 /* adapt busy-wait algorithm */ 468 if (spin*2 + 16 < sc->sc_spinmax) 469 sc->sc_spinmax--; 470 } 471 } else { 472 int s; 473 474 while (sc->sc_count > 0) { 475 /* if the printer is ready for a char, give it one */ 476 if ((sc->sc_state & LPT_OBUSY) == 0) { 477 LPRINTF(("%s: write %d\n", sc->sc_dev.dv_xname, 478 sc->sc_count)); 479 s = spltty(); 480 (void) lptintr(sc); 481 splx(s); 482 } 483 error = tsleep((caddr_t)sc, LPTPRI | PCATCH, 484 "lptwrite2", 0); 485 if (error) 486 return error; 487 } 488 } 489 return 0; 490 } 491 492 /* 493 * Copy a line from user space to a local buffer, then call putc to get the 494 * chars moved to the output queue. 495 */ 496 int 497 lptwrite(dev, uio, flags) 498 dev_t dev; 499 struct uio *uio; 500 int flags; 501 { 502 struct lpt_softc *sc = lpt_cd.cd_devs[LPTUNIT(dev)]; 503 size_t n; 504 int error = 0; 505 506 while ((n = min(LPT_BSIZE, uio->uio_resid)) != 0) { 507 uiomove(sc->sc_cp = sc->sc_inbuf->b_data, n, uio); 508 sc->sc_count = n; 509 error = pushbytes(sc); 510 if (error) { 511 /* 512 * Return accurate residual if interrupted or timed 513 * out. 514 */ 515 uio->uio_resid += sc->sc_count; 516 sc->sc_count = 0; 517 return error; 518 } 519 } 520 return 0; 521 } 522 523 /* 524 * Handle printer interrupts which occur when the printer is ready to accept 525 * another char. 526 */ 527 int 528 lptintr(arg) 529 void *arg; 530 { 531 struct lpt_softc *sc = arg; 532 bus_space_tag_t iot = sc->sc_iot; 533 bus_space_handle_t ioh = sc->sc_ioh; 534 535 #if 0 536 if ((sc->sc_state & LPT_OPEN) == 0) 537 return 0; 538 #endif 539 540 /* is printer online and ready for output */ 541 if (NOT_READY() && NOT_READY_ERR()) 542 return 0; 543 544 if (sc->sc_count) { 545 u_char control = sc->sc_control; 546 /* send char */ 547 bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++); 548 bus_space_write_1(iot, ioh, lpt_control, control | LPC_STROBE); 549 sc->sc_count--; 550 bus_space_write_1(iot, ioh, lpt_control, control); 551 sc->sc_state |= LPT_OBUSY; 552 } else 553 sc->sc_state &= ~LPT_OBUSY; 554 555 if (sc->sc_count == 0) { 556 /* none, wake up the top half to get more */ 557 wakeup((caddr_t)sc); 558 } 559 560 return 1; 561 } 562 563 int 564 lptioctl(dev, cmd, data, flag, p) 565 dev_t dev; 566 u_long cmd; 567 caddr_t data; 568 int flag; 569 struct proc *p; 570 { 571 int error = 0; 572 573 switch (cmd) { 574 default: 575 error = ENODEV; 576 } 577 578 return error; 579 } 580
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