lpt.c revision 1.30
1 /* $NetBSD: lpt.c,v 1.30 1995/04/17 12:09:17 cgd 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/syslog.h> 66 67 #include <machine/cpu.h> 68 #include <machine/pio.h> 69 70 #include <dev/isa/isavar.h> 71 #include <dev/isa/lptreg.h> 72 73 #define TIMEOUT hz*16 /* wait up to 16 seconds for a ready */ 74 #define STEP hz/4 75 76 #define LPTPRI (PZERO+8) 77 #define LPT_BSIZE 1024 78 79 #if !defined(DEBUG) || !defined(notdef) 80 #define lprintf 81 #else 82 #define lprintf if (lptdebug) printf 83 int lptdebug = 1; 84 #endif 85 86 struct lpt_softc { 87 struct device sc_dev; 88 void *sc_ih; 89 90 size_t sc_count; 91 struct buf *sc_inbuf; 92 u_char *sc_cp; 93 int sc_spinmax; 94 int sc_iobase; 95 int 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 u_char sc_laststatus; 106 }; 107 108 int lptprobe __P((struct device *, void *, void *)); 109 void lptattach __P((struct device *, struct device *, void *)); 110 int lptintr __P((void *)); 111 112 struct cfdriver lptcd = { 113 NULL, "lpt", lptprobe, lptattach, DV_TTY, sizeof(struct lpt_softc) 114 }; 115 116 #define LPTUNIT(s) (minor(s) & 0x1f) 117 #define LPTFLAGS(s) (minor(s) & 0xe0) 118 119 #define LPS_INVERT (LPS_SELECT|LPS_NERR|LPS_NBSY|LPS_NACK) 120 #define LPS_MASK (LPS_SELECT|LPS_NERR|LPS_NBSY|LPS_NACK|LPS_NOPAPER) 121 #define NOT_READY() ((inb(iobase + lpt_status) ^ LPS_INVERT) & LPS_MASK) 122 #define NOT_READY_ERR() not_ready(inb(iobase + lpt_status), sc) 123 static int not_ready __P((u_char, struct lpt_softc *)); 124 125 static void lptwakeup __P((void *arg)); 126 static int pushbytes __P((struct lpt_softc *)); 127 128 /* 129 * Internal routine to lptprobe to do port tests of one byte value. 130 */ 131 int 132 lpt_port_test(port, data, mask) 133 int port; 134 u_char data, mask; 135 { 136 int timeout; 137 u_char temp; 138 139 data &= mask; 140 outb(port, data); 141 timeout = 1000; 142 do { 143 delay(10); 144 temp = inb(port) & mask; 145 } while (temp != data && --timeout); 146 lprintf("lpt: port=0x%x out=0x%x in=0x%x timeout=%d\n", port, data, 147 temp, timeout); 148 return (temp == data); 149 } 150 151 /* 152 * Logic: 153 * 1) You should be able to write to and read back the same value 154 * to the data port. Do an alternating zeros, alternating ones, 155 * walking zero, and walking one test to check for stuck bits. 156 * 157 * 2) You should be able to write to and read back the same value 158 * to the control port lower 5 bits, the upper 3 bits are reserved 159 * per the IBM PC technical reference manauls and different boards 160 * do different things with them. Do an alternating zeros, alternating 161 * ones, walking zero, and walking one test to check for stuck bits. 162 * 163 * Some printers drag the strobe line down when the are powered off 164 * so this bit has been masked out of the control port test. 165 * 166 * XXX Some printers may not like a fast pulse on init or strobe, I 167 * don't know at this point, if that becomes a problem these bits 168 * should be turned off in the mask byte for the control port test. 169 * 170 * 3) Set the data and control ports to a value of 0 171 */ 172 int 173 lptprobe(parent, match, aux) 174 struct device *parent; 175 void *match, *aux; 176 { 177 struct isa_attach_args *ia = aux; 178 int iobase = ia->ia_iobase; 179 int port; 180 u_char mask, data; 181 int i; 182 183 #ifdef DEBUG 184 #define ABORT do {printf("lptprobe: mask %x data %x failed\n", mask, data); \ 185 return 0;} while (0) 186 #else 187 #define ABORT return 0 188 #endif 189 190 port = iobase + lpt_data; 191 mask = 0xff; 192 193 data = 0x55; /* Alternating zeros */ 194 if (!lpt_port_test(port, data, mask)) 195 ABORT; 196 197 data = 0xaa; /* Alternating ones */ 198 if (!lpt_port_test(port, data, mask)) 199 ABORT; 200 201 for (i = 0; i < CHAR_BIT; i++) { /* Walking zero */ 202 data = ~(1 << i); 203 if (!lpt_port_test(port, data, mask)) 204 ABORT; 205 } 206 207 for (i = 0; i < CHAR_BIT; i++) { /* Walking one */ 208 data = (1 << i); 209 if (!lpt_port_test(port, data, mask)) 210 ABORT; 211 } 212 213 outb(iobase + lpt_data, 0); 214 outb(iobase + lpt_control, 0); 215 216 ia->ia_iosize = LPT_NPORTS; 217 ia->ia_msize = 0; 218 return 1; 219 } 220 221 void 222 lptattach(parent, self, aux) 223 struct device *parent, *self; 224 void *aux; 225 { 226 struct lpt_softc *sc = (void *)self; 227 struct isa_attach_args *ia = aux; 228 int iobase = ia->ia_iobase; 229 230 if (ia->ia_irq != IRQUNK) 231 printf("\n"); 232 else 233 printf(": polled\n"); 234 235 sc->sc_iobase = iobase; 236 sc->sc_irq = ia->ia_irq; 237 sc->sc_state = 0; 238 outb(iobase + lpt_control, LPC_NINIT); 239 240 if (ia->ia_irq != IRQUNK) 241 sc->sc_ih = isa_intr_establish(ia->ia_irq, ISA_IST_EDGE, 242 ISA_IPL_NONE, lptintr, sc); 243 } 244 245 /* 246 * Reset the printer, then wait until it's selected and not busy. 247 */ 248 int 249 lptopen(dev, flag) 250 dev_t dev; 251 int flag; 252 { 253 int unit = LPTUNIT(dev); 254 u_char flags = LPTFLAGS(dev); 255 struct lpt_softc *sc; 256 int iobase; 257 u_char control; 258 int error; 259 int spin; 260 261 if (unit >= lptcd.cd_ndevs) 262 return ENXIO; 263 sc = lptcd.cd_devs[unit]; 264 if (!sc) 265 return ENXIO; 266 267 if (sc->sc_irq == IRQUNK && (flags & LPT_NOINTR) == 0) 268 return ENXIO; 269 270 #ifdef DIAGNOSTIC 271 if (sc->sc_state) 272 printf("%s: stat=0x%x not zero\n", sc->sc_dev.dv_xname, 273 sc->sc_state); 274 #endif 275 276 if (sc->sc_state) 277 return EBUSY; 278 279 sc->sc_state = LPT_INIT; 280 sc->sc_flags = flags; 281 lprintf("%s: open: flags=0x%x\n", sc->sc_dev.dv_xname, flags); 282 iobase = sc->sc_iobase; 283 284 if ((flags & LPT_NOPRIME) == 0) { 285 /* assert INIT for 100 usec to start up printer */ 286 outb(iobase + lpt_control, LPC_SELECT); 287 delay(100); 288 } 289 290 control = LPC_SELECT | LPC_NINIT; 291 outb(iobase + lpt_control, control); 292 293 /* wait till ready (printer running diagnostics) */ 294 for (spin = 0; NOT_READY_ERR(); spin += STEP) { 295 if (spin >= TIMEOUT) { 296 sc->sc_state = 0; 297 return EBUSY; 298 } 299 300 /* wait 1/4 second, give up if we get a signal */ 301 if (error = tsleep((caddr_t)sc, LPTPRI | PCATCH, "lptopen", 302 STEP) != EWOULDBLOCK) { 303 sc->sc_state = 0; 304 return error; 305 } 306 } 307 308 if ((flags & LPT_NOINTR) == 0) 309 control |= LPC_IENABLE; 310 if (flags & LPT_AUTOLF) 311 control |= LPC_AUTOLF; 312 sc->sc_control = control; 313 outb(iobase + lpt_control, control); 314 315 sc->sc_inbuf = geteblk(LPT_BSIZE); 316 sc->sc_count = 0; 317 sc->sc_state = LPT_OPEN; 318 319 if ((sc->sc_flags & LPT_NOINTR) == 0) 320 lptwakeup(sc); 321 322 lprintf("%s: opened\n", sc->sc_dev.dv_xname); 323 return 0; 324 } 325 326 int 327 not_ready(status, sc) 328 u_char status; 329 struct lpt_softc *sc; 330 { 331 u_char new; 332 333 status = (status ^ LPS_INVERT) & LPS_MASK; 334 new = status & ~sc->sc_laststatus; 335 sc->sc_laststatus = status; 336 337 if (new & LPS_SELECT) 338 log(LOG_NOTICE, "%s: offline\n", sc->sc_dev.dv_xname); 339 else if (new & LPS_NOPAPER) 340 log(LOG_NOTICE, "%s: out of paper\n", sc->sc_dev.dv_xname); 341 else if (new & LPS_NERR) 342 log(LOG_NOTICE, "%s: output error\n", sc->sc_dev.dv_xname); 343 344 return status; 345 } 346 347 void 348 lptwakeup(arg) 349 void *arg; 350 { 351 struct lpt_softc *sc = arg; 352 int s; 353 354 s = spltty(); 355 lptintr(sc); 356 splx(s); 357 358 timeout(lptwakeup, sc, STEP); 359 } 360 361 /* 362 * Close the device, and free the local line buffer. 363 */ 364 lptclose(dev, flag) 365 dev_t dev; 366 int flag; 367 { 368 int unit = LPTUNIT(dev); 369 struct lpt_softc *sc = lptcd.cd_devs[unit]; 370 int iobase = sc->sc_iobase; 371 372 if (sc->sc_count) 373 (void) pushbytes(sc); 374 375 if ((sc->sc_flags & LPT_NOINTR) == 0) 376 untimeout(lptwakeup, sc); 377 378 outb(iobase + lpt_control, LPC_NINIT); 379 sc->sc_state = 0; 380 outb(iobase + lpt_control, LPC_NINIT); 381 brelse(sc->sc_inbuf); 382 383 lprintf("%s: closed\n", sc->sc_dev.dv_xname); 384 return 0; 385 } 386 387 int 388 pushbytes(sc) 389 struct lpt_softc *sc; 390 { 391 int iobase = sc->sc_iobase; 392 int error; 393 394 if (sc->sc_flags & LPT_NOINTR) { 395 int spin, tic; 396 u_char control = sc->sc_control; 397 398 while (sc->sc_count > 0) { 399 spin = 0; 400 while (NOT_READY()) { 401 if (++spin < sc->sc_spinmax) 402 continue; 403 tic = 0; 404 /* adapt busy-wait algorithm */ 405 sc->sc_spinmax++; 406 while (NOT_READY_ERR()) { 407 /* exponential backoff */ 408 tic = tic + tic + 1; 409 if (tic > TIMEOUT) 410 tic = TIMEOUT; 411 error = tsleep((caddr_t)sc, 412 LPTPRI | PCATCH, "lptpsh", tic); 413 if (error != EWOULDBLOCK) 414 return error; 415 } 416 break; 417 } 418 419 outb(iobase + lpt_data, *sc->sc_cp++); 420 outb(iobase + lpt_control, control | LPC_STROBE); 421 sc->sc_count--; 422 outb(iobase + lpt_control, control); 423 424 /* adapt busy-wait algorithm */ 425 if (spin*2 + 16 < sc->sc_spinmax) 426 sc->sc_spinmax--; 427 } 428 } else { 429 int s; 430 431 while (sc->sc_count > 0) { 432 /* if the printer is ready for a char, give it one */ 433 if ((sc->sc_state & LPT_OBUSY) == 0) { 434 lprintf("%s: write %d\n", sc->sc_dev.dv_xname, 435 sc->sc_count); 436 s = spltty(); 437 (void) lptintr(sc); 438 splx(s); 439 } 440 if (error = tsleep((caddr_t)sc, LPTPRI | PCATCH, 441 "lptwrite2", 0)) 442 return error; 443 } 444 } 445 return 0; 446 } 447 448 /* 449 * Copy a line from user space to a local buffer, then call putc to get the 450 * chars moved to the output queue. 451 */ 452 lptwrite(dev, uio) 453 dev_t dev; 454 struct uio *uio; 455 { 456 struct lpt_softc *sc = lptcd.cd_devs[LPTUNIT(dev)]; 457 size_t n; 458 int error = 0; 459 460 while (n = min(LPT_BSIZE, uio->uio_resid)) { 461 uiomove(sc->sc_cp = sc->sc_inbuf->b_data, n, uio); 462 sc->sc_count = n; 463 error = pushbytes(sc); 464 if (error) { 465 /* 466 * Return accurate residual if interrupted or timed 467 * out. 468 */ 469 uio->uio_resid += sc->sc_count; 470 sc->sc_count = 0; 471 return error; 472 } 473 } 474 return 0; 475 } 476 477 /* 478 * Handle printer interrupts which occur when the printer is ready to accept 479 * another char. 480 */ 481 int 482 lptintr(arg) 483 void *arg; 484 { 485 struct lpt_softc *sc = arg; 486 int iobase = sc->sc_iobase; 487 488 #if 0 489 if ((sc->sc_state & LPT_OPEN) == 0) 490 return 0; 491 #endif 492 493 /* is printer online and ready for output */ 494 if (NOT_READY() && NOT_READY_ERR()) 495 return 0; 496 497 if (sc->sc_count) { 498 u_char control = sc->sc_control; 499 /* send char */ 500 outb(iobase + lpt_data, *sc->sc_cp++); 501 outb(iobase + lpt_control, control | LPC_STROBE); 502 sc->sc_count--; 503 outb(iobase + lpt_control, control); 504 sc->sc_state |= LPT_OBUSY; 505 } else 506 sc->sc_state &= ~LPT_OBUSY; 507 508 if (sc->sc_count == 0) { 509 /* none, wake up the top half to get more */ 510 wakeup((caddr_t)sc); 511 } 512 513 return 1; 514 } 515 516 int 517 lptioctl(dev, cmd, data, flag) 518 dev_t dev; 519 u_long cmd; 520 caddr_t data; 521 int flag; 522 { 523 int error = 0; 524 525 switch (cmd) { 526 default: 527 error = ENODEV; 528 } 529 530 return error; 531 } 532
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