lpt.c revision 1.15
1 /* 2 * Copyright (c) 1993, 1994 Charles Hannum. 3 * Copyright (c) 1990 William F. Jolitz, TeleMuse 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This software is a component of "386BSD" developed by 17 * William F. Jolitz, TeleMuse. 18 * 4. Neither the name of the developer nor the name "386BSD" 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS A COMPONENT OF 386BSD DEVELOPED BY WILLIAM F. JOLITZ 23 * AND IS INTENDED FOR RESEARCH AND EDUCATIONAL PURPOSES ONLY. THIS 24 * SOFTWARE SHOULD NOT BE CONSIDERED TO BE A COMMERCIAL PRODUCT. 25 * THE DEVELOPER URGES THAT USERS WHO REQUIRE A COMMERCIAL PRODUCT 26 * NOT MAKE USE OF THIS WORK. 27 * 28 * FOR USERS WHO WISH TO UNDERSTAND THE 386BSD SYSTEM DEVELOPED 29 * BY WILLIAM F. JOLITZ, WE RECOMMEND THE USER STUDY WRITTEN 30 * REFERENCES SUCH AS THE "PORTING UNIX TO THE 386" SERIES 31 * (BEGINNING JANUARY 1991 "DR. DOBBS JOURNAL", USA AND BEGINNING 32 * JUNE 1991 "UNIX MAGAZIN", GERMANY) BY WILLIAM F. JOLITZ AND 33 * LYNNE GREER JOLITZ, AS WELL AS OTHER BOOKS ON UNIX AND THE 34 * ON-LINE 386BSD USER MANUAL BEFORE USE. A BOOK DISCUSSING THE INTERNALS 35 * OF 386BSD ENTITLED "386BSD FROM THE INSIDE OUT" WILL BE AVAILABLE LATE 1992. 36 * 37 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPER ``AS IS'' AND 38 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 39 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 40 * ARE DISCLAIMED. IN NO EVENT SHALL THE DEVELOPER BE LIABLE 41 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 42 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 43 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 44 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 45 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 46 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 47 * SUCH DAMAGE. 48 * 49 * $Id: lpt.c,v 1.15 1994/03/29 04:36:08 mycroft Exp $ 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/syslog.h> 66 67 #include <machine/cpu.h> 68 #include <machine/pio.h> 69 70 #include <i386/isa/isa.h> 71 #include <i386/isa/isavar.h> 72 #include <i386/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 #ifndef DEBUG 81 #define lprintf 82 #else 83 #define lprintf if (lptdebug) printf 84 int lptdebug = 1; 85 #endif 86 87 struct lpt_softc { 88 struct device sc_dev; 89 90 size_t sc_count; 91 struct buf *sc_inbuf; 92 u_char *sc_cp; 93 int sc_spinmax; 94 u_short sc_iobase; 95 u_short sc_irq; 96 u_char sc_state; 97 #define LPT_OPEN 0x01 /* device is open */ 98 #define LPT_OBUSY 0x02 /* printer is busy doing output */ 99 #define LPT_INIT 0x04 /* waiting to initialize for open */ 100 u_char sc_flags; 101 #define LPT_AUTOLF 0x20 /* automatic LF on CR */ 102 #define LPT_NOPRIME 0x40 /* don't prime on open */ 103 #define LPT_NOINTR 0x80 /* do not use interrupt */ 104 u_char sc_control; 105 }; 106 107 int lptprobe(); 108 void lptattach(); 109 int lptintr __P((int)); 110 111 struct cfdriver lptcd = { 112 NULL, "lpt", lptprobe, lptattach, DV_TTY, sizeof(struct lpt_softc) 113 }; 114 115 #define LPTUNIT(s) (minor(s) & 0x1f) 116 #define LPTFLAGS(s) (minor(s) & 0xe0) 117 118 #define LPS_INVERT (LPS_SELECT|LPS_NERR|LPS_NBSY|LPS_NACK) 119 #define LPS_MASK (LPS_SELECT|LPS_NERR|LPS_NBSY|LPS_NACK|LPS_NOPAPER) 120 #ifndef DIAGNOSTIC 121 #define NOT_READY() ((inb(iobase + lpt_status) ^ LPS_INVERT) & LPS_MASK) 122 #else 123 #define NOT_READY() notready(inb(iobase + lpt_status), sc) 124 static int notready __P((u_char, struct lpt_softc *)); 125 #endif 126 127 static void lptout __P((struct lpt_softc *)); 128 static int pushbytes __P((struct lpt_softc *)); 129 130 /* 131 * Internal routine to lptprobe to do port tests of one byte value. 132 */ 133 int 134 lpt_port_test(port, data, mask) 135 u_short port; 136 u_char data, mask; 137 { 138 int timeout; 139 u_char temp; 140 141 data &= mask; 142 outb(port, data); 143 timeout = 1000; 144 do { 145 delay(10); 146 temp = inb(port) & mask; 147 } while (temp != data && --timeout); 148 lprintf("lpt: port=0x%x out=0x%x in=0x%x timeout=%d\n", port, data, 149 temp, timeout); 150 return (temp == data); 151 } 152 153 /* 154 * Logic: 155 * 1) You should be able to write to and read back the same value 156 * to the data port. Do an alternating zeros, alternating ones, 157 * walking zero, and walking one test to check for stuck bits. 158 * 159 * 2) You should be able to write to and read back the same value 160 * to the control port lower 5 bits, the upper 3 bits are reserved 161 * per the IBM PC technical reference manauls and different boards 162 * do different things with them. Do an alternating zeros, alternating 163 * ones, walking zero, and walking one test to check for stuck bits. 164 * 165 * Some printers drag the strobe line down when the are powered off 166 * so this bit has been masked out of the control port test. 167 * 168 * XXX Some printers may not like a fast pulse on init or strobe, I 169 * don't know at this point, if that becomes a problem these bits 170 * should be turned off in the mask byte for the control port test. 171 * 172 * 3) Set the data and control ports to a value of 0 173 */ 174 int 175 lptprobe(parent, self, aux) 176 struct device *parent, *self; 177 void *aux; 178 { 179 struct isa_attach_args *ia = aux; 180 u_short iobase = ia->ia_iobase; 181 u_short port; 182 u_char mask, data; 183 int i; 184 185 #ifdef DEBUG 186 #define ABORT do {printf("lptprobe: mask %x data %x failed\n", mask, data); \ 187 return 0;} while (0) 188 #else 189 #define ABORT return 0 190 #endif 191 192 port = iobase + lpt_data; 193 mask = 0xff; 194 195 for (;;) { 196 data = 0x55; /* Alternating zeros */ 197 if (!lpt_port_test(port, data, mask)) 198 ABORT; 199 200 data = 0xaa; /* Alternating ones */ 201 if (!lpt_port_test(port, data, mask)) 202 ABORT; 203 204 for (i = 0; i < CHAR_BIT; i++) { /* Walking zero */ 205 data = ~(1 << i); 206 if (!lpt_port_test(port, data, mask)) 207 ABORT; 208 } 209 210 for (i = 0; i < CHAR_BIT; i++) { /* Walking one */ 211 data = (1 << i); 212 if (!lpt_port_test(port, data, mask)) 213 ABORT; 214 } 215 216 if (port == iobase + lpt_data) { 217 port = iobase + lpt_control; 218 #if 1 /* XXX */ 219 mask = 0x04; 220 #else 221 mask = 0x1e; 222 #endif 223 } else 224 break; 225 } 226 outb(iobase + lpt_data, 0); 227 outb(iobase + lpt_control, 0); 228 229 ia->ia_iosize = LPT_NPORTS; 230 ia->ia_msize = 0; 231 return 1; 232 } 233 234 void 235 lptattach(parent, self, aux) 236 struct device *parent, *self; 237 void *aux; 238 { 239 struct lpt_softc *sc = (void *)self; 240 struct isa_attach_args *ia = aux; 241 u_short iobase = ia->ia_iobase; 242 u_short irq = ia->ia_irq; 243 244 if (irq) 245 printf("\n"); 246 else 247 printf(": polled\n"); 248 249 sc->sc_iobase = iobase; 250 sc->sc_irq = irq; 251 sc->sc_state = 0; 252 outb(iobase + lpt_control, LPC_NINIT); 253 } 254 255 /* 256 * Reset the printer, then wait until it's selected and not busy. 257 */ 258 int 259 lptopen(dev, flag) 260 dev_t dev; 261 int flag; 262 { 263 int unit = LPTUNIT(dev); 264 u_char flags = LPTFLAGS(dev); 265 struct lpt_softc *sc; 266 u_short iobase; 267 u_char control; 268 int error; 269 int spin; 270 271 if (unit >= lptcd.cd_ndevs) 272 return ENXIO; 273 sc = lptcd.cd_devs[unit]; 274 if (!sc) 275 return ENXIO; 276 277 if (sc->sc_irq == 0 && (flags & LPT_NOINTR) == 0) 278 return ENXIO; 279 280 #ifdef DIAGNOSTIC 281 if (sc->sc_state) 282 printf("%s: stat=0x%x not zero\n", sc->sc_dev.dv_xname, 283 sc->sc_state); 284 #endif 285 286 if (sc->sc_state) 287 return EBUSY; 288 289 sc->sc_state = LPT_INIT; 290 sc->sc_flags = flags; 291 lprintf("%s: open: flags=0x%x\n", sc->sc_dev.dv_xname, flags); 292 iobase = sc->sc_iobase; 293 294 if ((flags & LPT_NOPRIME) == 0) { 295 /* assert INIT for 100 usec to start up printer */ 296 outb(iobase + lpt_control, LPC_SELECT); 297 delay(100); 298 } 299 300 control = LPC_SELECT | LPC_NINIT; 301 outb(iobase + lpt_control, control); 302 303 /* wait till ready (printer running diagnostics) */ 304 for (spin = 0; NOT_READY(); spin += STEP) { 305 if (spin >= TIMEOUT) { 306 sc->sc_state = 0; 307 return EBUSY; 308 } 309 310 /* wait 1/4 second, give up if we get a signal */ 311 if (error = tsleep((caddr_t)sc, LPTPRI | PCATCH, "lptopen", 312 STEP) != EWOULDBLOCK) { 313 sc->sc_state = 0; 314 return error; 315 } 316 } 317 318 if ((flags & LPT_NOINTR) == 0) 319 control |= LPC_IENABLE; 320 if (flags & LPT_AUTOLF) 321 control |= LPC_AUTOLF; 322 sc->sc_control = control; 323 outb(iobase + lpt_control, control); 324 325 sc->sc_inbuf = geteblk(LPT_BSIZE); 326 sc->sc_count = 0; 327 sc->sc_state = LPT_OPEN; 328 lptout(sc); 329 330 lprintf("%s: opened\n", sc->sc_dev.dv_xname); 331 return 0; 332 } 333 334 #ifdef DIAGNOSTIC 335 int 336 notready(status, sc) 337 u_char status; 338 struct lpt_softc *sc; 339 { 340 status ^= LPS_INVERT; 341 342 if (status & LPS_NOPAPER) 343 log(LOG_NOTICE, "%s: out of paper\n", sc->sc_dev.dv_xname); 344 else if (status & LPS_SELECT) 345 log(LOG_NOTICE, "%s: offline\n", sc->sc_dev.dv_xname); 346 else if (status & LPS_NERR) 347 log(LOG_NOTICE, "%s: output error\n", sc->sc_dev.dv_xname); 348 349 return status & LPS_MASK; 350 } 351 #endif 352 353 void 354 lptout(sc) 355 struct lpt_softc *sc; 356 { 357 int s; 358 359 if (sc->sc_flags & LPT_NOINTR) 360 return; 361 362 s = spltty(); 363 lptintr(sc->sc_dev.dv_unit); 364 splx(s); 365 366 timeout((timeout_t)lptout, (caddr_t)sc, STEP); 367 } 368 369 /* 370 * Close the device, and free the local line buffer. 371 */ 372 lptclose(dev, flag) 373 dev_t dev; 374 int flag; 375 { 376 int unit = LPTUNIT(dev); 377 struct lpt_softc *sc = lptcd.cd_devs[unit]; 378 u_short iobase = sc->sc_iobase; 379 380 if (sc->sc_count) 381 (void) pushbytes(sc); 382 383 outb(iobase + lpt_control, LPC_NINIT); 384 sc->sc_state = 0; 385 outb(iobase + lpt_control, LPC_NINIT); 386 brelse(sc->sc_inbuf); 387 388 lprintf("%s: closed\n", sc->sc_dev.dv_xname); 389 return 0; 390 } 391 392 int 393 pushbytes(sc) 394 struct lpt_softc *sc; 395 { 396 u_short iobase = sc->sc_iobase; 397 int error; 398 399 if (sc->sc_flags & LPT_NOINTR) { 400 int spin, tic; 401 u_char control = sc->sc_control; 402 403 while (sc->sc_count > 0) { 404 spin = 0; 405 while (NOT_READY() && spin++ < sc->sc_spinmax); 406 if (spin >= sc->sc_spinmax) { 407 tic = 0; 408 /* adapt busy-wait algorithm */ 409 sc->sc_spinmax++; 410 while (NOT_READY()) { 411 /* exponential backoff */ 412 tic = tic + tic + 1; 413 if (tic > TIMEOUT) 414 tic = TIMEOUT; 415 error = tsleep((caddr_t)sc, 416 LPTPRI | PCATCH, "lptpsh", tic); 417 if (error != EWOULDBLOCK) 418 return error; 419 } 420 } 421 422 outb(iobase + lpt_data, *sc->sc_cp++); 423 outb(iobase + lpt_control, control | LPC_STROBE); 424 sc->sc_count--; 425 outb(iobase + lpt_control, control); 426 427 /* adapt busy-wait algorithm */ 428 if (spin*2 < sc->sc_spinmax) 429 sc->sc_spinmax--; 430 } 431 } else { 432 int s; 433 434 while (sc->sc_count > 0) { 435 /* if the printer is ready for a char, give it one */ 436 if ((sc->sc_state & LPT_OBUSY) == 0) { 437 lprintf("%s: write %d\n", sc->sc_dev.dv_xname, 438 sc->sc_count); 439 s = spltty(); 440 (void) lptintr(sc->sc_dev.dv_unit); 441 splx(s); 442 } 443 if (error = tsleep((caddr_t)sc, LPTPRI | PCATCH, 444 "lptwrite2", 0)) 445 return error; 446 } 447 } 448 return 0; 449 } 450 451 /* 452 * Copy a line from user space to a local buffer, then call putc to get the 453 * chars moved to the output queue. 454 */ 455 lptwrite(dev, uio) 456 dev_t dev; 457 struct uio *uio; 458 { 459 struct lpt_softc *sc = lptcd.cd_devs[LPTUNIT(dev)]; 460 size_t n; 461 int error = 0; 462 463 while (n = min(LPT_BSIZE, uio->uio_resid)) { 464 uiomove(sc->sc_cp = sc->sc_inbuf->b_un.b_addr, n, uio); 465 sc->sc_count = n; 466 error = pushbytes(sc); 467 if (error) { 468 /* 469 * Return accurate residual if interrupted or timed 470 * out. 471 */ 472 uio->uio_resid += sc->sc_count; 473 sc->sc_count = 0; 474 return error; 475 } 476 } 477 return 0; 478 } 479 480 /* 481 * Handle printer interrupts which occur when the printer is ready to accept 482 * another char. 483 */ 484 int 485 lptintr(unit) 486 int unit; 487 { 488 struct lpt_softc *sc = lptcd.cd_devs[unit]; 489 u_short iobase = sc->sc_iobase; 490 491 #if 0 492 if ((sc->sc_state & LPT_OPEN) == 0) 493 return 0; 494 #endif 495 496 /* is printer online and ready for output */ 497 if (NOT_READY()) 498 return 0; 499 500 if (sc->sc_count) { 501 u_char control = sc->sc_control; 502 /* send char */ 503 outb(iobase + lpt_data, *sc->sc_cp++); 504 outb(iobase + lpt_control, control | LPC_STROBE); 505 sc->sc_count--; 506 outb(iobase + lpt_control, control); 507 sc->sc_state |= LPT_OBUSY; 508 } else 509 sc->sc_state &= ~LPT_OBUSY; 510 511 if (sc->sc_count == 0) { 512 /* none, wake up the top half to get more */ 513 wakeup((caddr_t)sc); 514 } 515 516 return 1; 517 } 518 519 int 520 lptioctl(dev, cmd, data, flag) 521 dev_t dev; 522 int cmd; 523 caddr_t data; 524 int flag; 525 { 526 int error = 0; 527 528 switch (cmd) { 529 default: 530 error = ENODEV; 531 } 532 533 return error; 534 } 535
Indexes created Mon Sep 22 10:09:38 GMT 2025