1 /* 2 * Copyright (c) 1990 William F. Jolitz, TeleMuse 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This software is a component of "386BSD" developed by 16 * William F. Jolitz, TeleMuse. 17 * 4. Neither the name of the developer nor the name "386BSD" 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS A COMPONENT OF 386BSD DEVELOPED BY WILLIAM F. JOLITZ 22 * AND IS INTENDED FOR RESEARCH AND EDUCATIONAL PURPOSES ONLY. THIS 23 * SOFTWARE SHOULD NOT BE CONSIDERED TO BE A COMMERCIAL PRODUCT. 24 * THE DEVELOPER URGES THAT USERS WHO REQUIRE A COMMERCIAL PRODUCT 25 * NOT MAKE USE OF THIS WORK. 26 * 27 * FOR USERS WHO WISH TO UNDERSTAND THE 386BSD SYSTEM DEVELOPED 28 * BY WILLIAM F. JOLITZ, WE RECOMMEND THE USER STUDY WRITTEN 29 * REFERENCES SUCH AS THE "PORTING UNIX TO THE 386" SERIES 30 * (BEGINNING JANUARY 1991 "DR. DOBBS JOURNAL", USA AND BEGINNING 31 * JUNE 1991 "UNIX MAGAZIN", GERMANY) BY WILLIAM F. JOLITZ AND 32 * LYNNE GREER JOLITZ, AS WELL AS OTHER BOOKS ON UNIX AND THE 33 * ON-LINE 386BSD USER MANUAL BEFORE USE. A BOOK DISCUSSING THE INTERNALS 34 * OF 386BSD ENTITLED "386BSD FROM THE INSIDE OUT" WILL BE AVAILABLE LATE 1992. 35 * 36 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPER ``AS IS'' AND 37 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 38 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 39 * ARE DISCLAIMED. IN NO EVENT SHALL THE DEVELOPER BE LIABLE 40 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 41 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 42 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 43 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 44 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 45 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 46 * SUCH DAMAGE. 47 * 48 * from: unknown origin, 386BSD 0.1 49 * From Id: lpt.c,v 1.55.2.1 1996/11/12 09:08:38 phk Exp 50 * From Id: nlpt.c,v 1.14 1999/02/08 13:55:43 des Exp 51 * $FreeBSD$ 52 */ 53 54 /* 55 * Device Driver for AT parallel printer port 56 * Written by William Jolitz 12/18/90 57 */ 58 59 /* 60 * Updated for ppbus by Nicolas Souchu 61 * [Mon Jul 28 1997] 62 */ 63 64 #include "opt_lpt.h" 65 66 #include <sys/param.h> 67 #include <sys/systm.h> 68 #include <sys/module.h> 69 #include <sys/bus.h> 70 #include <sys/conf.h> 71 #include <sys/kernel.h> 72 #include <sys/uio.h> 73 #include <sys/syslog.h> 74 #include <sys/malloc.h> 75 76 #include <machine/clock.h> 77 #include <machine/bus.h> 78 #include <machine/resource.h> 79 #include <sys/rman.h> 80 81 #include <dev/ppbus/lptio.h> 82 #include <dev/ppbus/ppbconf.h> 83 #include <dev/ppbus/ppb_1284.h> 84 #include <dev/ppbus/lpt.h> 85 #include "ppbus_if.h" 86 #include <dev/ppbus/ppbio.h> 87 88 MALLOC_DEFINE(M_LPT, "lpt", "LPT buffers"); 89 90 #ifndef LPT_DEBUG 91 #define lprintf(args) 92 #else 93 #define lprintf(args) \ 94 do { \ 95 if (lptflag) \ 96 printf args; \ 97 } while (0) 98 static int volatile lptflag = 1; 99 #endif 100 101 #define LPINITRDY 4 /* wait up to 4 seconds for a ready */ 102 #define LPTOUTINITIAL 10 /* initial timeout to wait for ready 1/10 s */ 103 #define LPTOUTMAX 1 /* maximal timeout 1 s */ 104 #define LPPRI (PZERO+8) 105 #define BUFSIZE 1024 106 #define BUFSTATSIZE 32 107 108 #define LPTUNIT(s) ((s)&0x03) 109 #define LPTFLAGS(s) ((s)&0xfc) 110 111 struct lpt_data { 112 113 short sc_state; 114 /* default case: negative prime, negative ack, handshake strobe, 115 prime once */ 116 u_char sc_control; 117 char sc_flags; 118 #define LP_POS_INIT 0x04 /* if we are a postive init signal */ 119 #define LP_POS_ACK 0x08 /* if we are a positive going ack */ 120 #define LP_NO_PRIME 0x10 /* don't prime the printer at all */ 121 #define LP_PRIMEOPEN 0x20 /* prime on every open */ 122 #define LP_AUTOLF 0x40 /* tell printer to do an automatic lf */ 123 #define LP_BYPASS 0x80 /* bypass printer ready checks */ 124 void *sc_inbuf; 125 void *sc_statbuf; 126 short sc_xfercnt ; 127 char sc_primed; 128 char *sc_cp ; 129 u_short sc_irq ; /* IRQ status of port */ 130 #define LP_HAS_IRQ 0x01 /* we have an irq available */ 131 #define LP_USE_IRQ 0x02 /* we are using our irq */ 132 #define LP_ENABLE_IRQ 0x04 /* enable IRQ on open */ 133 #define LP_ENABLE_EXT 0x10 /* we shall use advanced mode when possible */ 134 u_char sc_backoff ; /* time to call lptout() again */ 135 136 struct resource *intr_resource; /* interrupt resource */ 137 void *intr_cookie; /* interrupt registration cookie */ 138 139 }; 140 141 #define LPT_NAME "lpt" /* our official name */ 142 143 static timeout_t lptout; 144 static int lpt_port_test(device_t dev, u_char data, u_char mask); 145 static int lpt_detect(device_t dev); 146 147 #define DEVTOSOFTC(dev) \ 148 ((struct lpt_data *)device_get_softc(dev)) 149 #define UNITOSOFTC(unit) \ 150 ((struct lpt_data *)devclass_get_softc(lpt_devclass, (unit))) 151 #define UNITODEVICE(unit) \ 152 (devclass_get_device(lpt_devclass, (unit))) 153 154 static void lptintr(device_t dev); 155 static void lpt_intr(void *arg); /* without spls */ 156 157 static devclass_t lpt_devclass; 158 159 160 /* bits for state */ 161 #define OPEN (1<<0) /* device is open */ 162 #define ASLP (1<<1) /* awaiting draining of printer */ 163 #define EERROR (1<<2) /* error was received from printer */ 164 #define OBUSY (1<<3) /* printer is busy doing output */ 165 #define LPTOUT (1<<4) /* timeout while not selected */ 166 #define TOUT (1<<5) /* timeout while not selected */ 167 #define LPTINIT (1<<6) /* waiting to initialize for open */ 168 #define INTERRUPTED (1<<7) /* write call was interrupted */ 169 170 #define HAVEBUS (1<<8) /* the driver owns the bus */ 171 172 173 /* status masks to interrogate printer status */ 174 #define RDY_MASK (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR) /* ready ? */ 175 #define LP_READY (LPS_SEL|LPS_NBSY|LPS_NERR) 176 177 /* Printer Ready condition - from lpa.c */ 178 /* Only used in polling code */ 179 #define LPS_INVERT (LPS_NBSY | LPS_NACK | LPS_SEL | LPS_NERR) 180 #define LPS_MASK (LPS_NBSY | LPS_NACK | LPS_OUT | LPS_SEL | LPS_NERR) 181 #define NOT_READY(ppbus) ((ppb_rstr(ppbus)^LPS_INVERT)&LPS_MASK) 182 183 #define MAX_SLEEP (hz*5) /* Timeout while waiting for device ready */ 184 #define MAX_SPIN 20 /* Max delay for device ready in usecs */ 185 186 187 static d_open_t lptopen; 188 static d_close_t lptclose; 189 static d_write_t lptwrite; 190 static d_read_t lptread; 191 static d_ioctl_t lptioctl; 192 193 #define CDEV_MAJOR 16 194 static struct cdevsw lpt_cdevsw = { 195 /* open */ lptopen, 196 /* close */ lptclose, 197 /* read */ lptread, 198 /* write */ lptwrite, 199 /* ioctl */ lptioctl, 200 /* poll */ nopoll, 201 /* mmap */ nommap, 202 /* strategy */ nostrategy, 203 /* name */ LPT_NAME, 204 /* maj */ CDEV_MAJOR, 205 /* dump */ nodump, 206 /* psize */ nopsize, 207 /* flags */ 0, 208 /* bmaj */ -1 209 }; 210 211 static int 212 lpt_request_ppbus(device_t dev, int how) 213 { 214 device_t ppbus = device_get_parent(dev); 215 struct lpt_data *sc = DEVTOSOFTC(dev); 216 int error; 217 218 if (sc->sc_state & HAVEBUS) 219 return (0); 220 221 /* we have the bus only if the request succeded */ 222 if ((error = ppb_request_bus(ppbus, dev, how)) == 0) 223 sc->sc_state |= HAVEBUS; 224 225 return (error); 226 } 227 228 static int 229 lpt_release_ppbus(device_t dev) 230 { 231 device_t ppbus = device_get_parent(dev); 232 struct lpt_data *sc = DEVTOSOFTC(dev); 233 int error = 0; 234 235 if ((error = ppb_release_bus(ppbus, dev)) == 0) 236 sc->sc_state &= ~HAVEBUS; 237 238 return (error); 239 } 240 241 /* 242 * Internal routine to lptprobe to do port tests of one byte value 243 */ 244 static int 245 lpt_port_test(device_t ppbus, u_char data, u_char mask) 246 { 247 int temp, timeout; 248 249 data = data & mask; 250 ppb_wdtr(ppbus, data); 251 timeout = 10000; 252 do { 253 DELAY(10); 254 temp = ppb_rdtr(ppbus) & mask; 255 } 256 while (temp != data && --timeout); 257 lprintf(("out=%x\tin=%x\ttout=%d\n", data, temp, timeout)); 258 return (temp == data); 259 } 260 261 /* 262 * Probe simplified by replacing multiple loops with a hardcoded 263 * test pattern - 1999/02/08 des@freebsd.org 264 * 265 * New lpt port probe Geoff Rehmet - Rhodes University - 14/2/94 266 * Based partially on Rod Grimes' printer probe 267 * 268 * Logic: 269 * 1) If no port address was given, use the bios detected ports 270 * and autodetect what ports the printers are on. 271 * 2) Otherwise, probe the data port at the address given, 272 * using the method in Rod Grimes' port probe. 273 * (Much code ripped off directly from Rod's probe.) 274 * 275 * Comments from Rod's probe: 276 * Logic: 277 * 1) You should be able to write to and read back the same value 278 * to the data port. Do an alternating zeros, alternating ones, 279 * walking zero, and walking one test to check for stuck bits. 280 * 281 * 2) You should be able to write to and read back the same value 282 * to the control port lower 5 bits, the upper 3 bits are reserved 283 * per the IBM PC technical reference manauls and different boards 284 * do different things with them. Do an alternating zeros, alternating 285 * ones, walking zero, and walking one test to check for stuck bits. 286 * 287 * Some printers drag the strobe line down when the are powered off 288 * so this bit has been masked out of the control port test. 289 * 290 * XXX Some printers may not like a fast pulse on init or strobe, I 291 * don't know at this point, if that becomes a problem these bits 292 * should be turned off in the mask byte for the control port test. 293 * 294 * We are finally left with a mask of 0x14, due to some printers 295 * being adamant about holding other bits high ........ 296 * 297 * Before probing the control port, we write a 0 to the data port - 298 * If not, some printers chuck out garbage when the strobe line 299 * gets toggled. 300 * 301 * 3) Set the data and control ports to a value of 0 302 * 303 * This probe routine has been tested on Epson Lx-800, HP LJ3P, 304 * Epson FX-1170 and C.Itoh 8510RM 305 * printers. 306 * Quick exit on fail added. 307 */ 308 static int 309 lpt_detect(device_t dev) 310 { 311 device_t ppbus = device_get_parent(dev); 312 313 static u_char testbyte[18] = { 314 0x55, /* alternating zeros */ 315 0xaa, /* alternating ones */ 316 0xfe, 0xfd, 0xfb, 0xf7, 317 0xef, 0xdf, 0xbf, 0x7f, /* walking zero */ 318 0x01, 0x02, 0x04, 0x08, 319 0x10, 0x20, 0x40, 0x80 /* walking one */ 320 }; 321 int i, error, status; 322 323 status = 1; /* assume success */ 324 325 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) { 326 printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error); 327 status = 0; 328 goto end_probe; 329 } 330 331 for (i = 0; i < 18 && status; i++) 332 if (!lpt_port_test(ppbus, testbyte[i], 0xff)) { 333 status = 0; 334 goto end_probe; 335 } 336 337 end_probe: 338 /* write 0's to control and data ports */ 339 ppb_wdtr(ppbus, 0); 340 ppb_wctr(ppbus, 0); 341 342 lpt_release_ppbus(dev); 343 344 return (status); 345 } 346 347 static void 348 lpt_identify(driver_t *driver, device_t parent) 349 { 350 351 BUS_ADD_CHILD(parent, 0, LPT_NAME, 0); 352 } 353 354 /* 355 * lpt_probe() 356 */ 357 static int 358 lpt_probe(device_t dev) 359 { 360 struct lpt_data *sc; 361 362 sc = DEVTOSOFTC(dev); 363 bzero(sc, sizeof(struct lpt_data)); 364 365 /* 366 * Now, try to detect the printer. 367 */ 368 if (!lpt_detect(dev)) 369 return (ENXIO); 370 371 device_set_desc(dev, "Printer"); 372 373 return (0); 374 } 375 376 static int 377 lpt_attach(device_t dev) 378 { 379 device_t ppbus = device_get_parent(dev); 380 struct lpt_data *sc = DEVTOSOFTC(dev); 381 int zero = 0, unit = device_get_unit(dev); 382 int error; 383 uintptr_t irq; 384 385 sc->sc_primed = 0; /* not primed yet */ 386 387 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) { 388 printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error); 389 return (0); 390 } 391 392 ppb_wctr(ppbus, LPC_NINIT); 393 394 /* check if we can use interrupt, should be done by ppc stuff */ 395 lprintf(("oldirq %x\n", sc->sc_irq)); 396 397 /* retrieve the ppbus irq */ 398 BUS_READ_IVAR(ppbus, dev, PPBUS_IVAR_IRQ, &irq); 399 400 if (irq > 0) { 401 /* declare our interrupt handler */ 402 sc->intr_resource = bus_alloc_resource(dev, SYS_RES_IRQ, 403 &zero, irq, irq, 1, RF_SHAREABLE); 404 } 405 if (sc->intr_resource) { 406 sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ; 407 device_printf(dev, "Interrupt-driven port\n"); 408 } else { 409 sc->sc_irq = 0; 410 device_printf(dev, "Polled port\n"); 411 } 412 lprintf(("irq %x %x\n", irq, sc->sc_irq)); 413 414 lpt_release_ppbus(dev); 415 416 make_dev(&lpt_cdevsw, unit, 417 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d", unit); 418 make_dev(&lpt_cdevsw, unit | LP_BYPASS, 419 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d.ctl", unit); 420 return (0); 421 } 422 423 static void 424 lptout(void *arg) 425 { 426 device_t dev = (device_t)arg; 427 struct lpt_data *sc = DEVTOSOFTC(dev); 428 #ifdef LPT_DEBUG 429 device_t ppbus = device_get_parent(dev); 430 #endif 431 432 lprintf(("T %x ", ppb_rstr(ppbus))); 433 if (sc->sc_state & OPEN) { 434 sc->sc_backoff++; 435 if (sc->sc_backoff > hz/LPTOUTMAX) 436 sc->sc_backoff = sc->sc_backoff > hz/LPTOUTMAX; 437 timeout(lptout, (caddr_t)dev, sc->sc_backoff); 438 } else 439 sc->sc_state &= ~TOUT; 440 441 if (sc->sc_state & EERROR) 442 sc->sc_state &= ~EERROR; 443 444 /* 445 * Avoid possible hangs due to missed interrupts 446 */ 447 if (sc->sc_xfercnt) { 448 lptintr(dev); 449 } else { 450 sc->sc_state &= ~OBUSY; 451 wakeup((caddr_t)dev); 452 } 453 } 454 455 /* 456 * lptopen -- reset the printer, then wait until it's selected and not busy. 457 * If LP_BYPASS flag is selected, then we do not try to select the 458 * printer -- this is just used for passing ioctls. 459 */ 460 461 static int 462 lptopen(dev_t dev, int flags, int fmt, struct proc *p) 463 { 464 int s; 465 int trys, err; 466 u_int unit = LPTUNIT(minor(dev)); 467 struct lpt_data *sc = UNITOSOFTC(unit); 468 device_t lptdev = UNITODEVICE(unit); 469 device_t ppbus = device_get_parent(lptdev); 470 471 if (!sc) 472 return (ENXIO); 473 474 if (sc->sc_state) { 475 lprintf((LPT_NAME ": still open %x\n", sc->sc_state)); 476 return(EBUSY); 477 } else 478 sc->sc_state |= LPTINIT; 479 480 sc->sc_flags = LPTFLAGS(minor(dev)); 481 482 /* Check for open with BYPASS flag set. */ 483 if (sc->sc_flags & LP_BYPASS) { 484 sc->sc_state = OPEN; 485 return(0); 486 } 487 488 /* request the ppbus only if we don't have it already */ 489 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) { 490 /* give it a chance to try later */ 491 sc->sc_state = 0; 492 return (err); 493 } 494 495 s = spltty(); 496 lprintf((LPT_NAME " flags 0x%x\n", sc->sc_flags)); 497 498 /* set IRQ status according to ENABLE_IRQ flag 499 */ 500 if (sc->sc_irq & LP_ENABLE_IRQ) 501 sc->sc_irq |= LP_USE_IRQ; 502 else 503 sc->sc_irq &= ~LP_USE_IRQ; 504 505 /* init printer */ 506 if ((sc->sc_flags & LP_NO_PRIME) == 0) { 507 if((sc->sc_flags & LP_PRIMEOPEN) || sc->sc_primed == 0) { 508 ppb_wctr(ppbus, 0); 509 sc->sc_primed++; 510 DELAY(500); 511 } 512 } 513 514 ppb_wctr(ppbus, LPC_SEL|LPC_NINIT); 515 516 /* wait till ready (printer running diagnostics) */ 517 trys = 0; 518 do { 519 /* ran out of waiting for the printer */ 520 if (trys++ >= LPINITRDY*4) { 521 splx(s); 522 sc->sc_state = 0; 523 lprintf(("status %x\n", ppb_rstr(ppbus))); 524 525 lpt_release_ppbus(lptdev); 526 return (EBUSY); 527 } 528 529 /* wait 1/4 second, give up if we get a signal */ 530 if (tsleep((caddr_t)lptdev, LPPRI|PCATCH, "lptinit", hz/4) != 531 EWOULDBLOCK) { 532 sc->sc_state = 0; 533 splx(s); 534 535 lpt_release_ppbus(lptdev); 536 return (EBUSY); 537 } 538 539 /* is printer online and ready for output */ 540 } while ((ppb_rstr(ppbus) & 541 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 542 (LPS_SEL|LPS_NBSY|LPS_NERR)); 543 544 sc->sc_control = LPC_SEL|LPC_NINIT; 545 if (sc->sc_flags & LP_AUTOLF) 546 sc->sc_control |= LPC_AUTOL; 547 548 /* enable interrupt if interrupt-driven */ 549 if (sc->sc_irq & LP_USE_IRQ) 550 sc->sc_control |= LPC_ENA; 551 552 ppb_wctr(ppbus, sc->sc_control); 553 554 sc->sc_state = OPEN; 555 sc->sc_inbuf = malloc(BUFSIZE, M_LPT, M_WAITOK); 556 sc->sc_statbuf = malloc(BUFSTATSIZE, M_LPT, M_WAITOK); 557 sc->sc_xfercnt = 0; 558 splx(s); 559 560 /* release the ppbus */ 561 lpt_release_ppbus(lptdev); 562 563 /* only use timeout if using interrupt */ 564 lprintf(("irq %x\n", sc->sc_irq)); 565 if (sc->sc_irq & LP_USE_IRQ) { 566 sc->sc_state |= TOUT; 567 timeout(lptout, (caddr_t)lptdev, 568 (sc->sc_backoff = hz/LPTOUTINITIAL)); 569 } 570 571 lprintf(("opened.\n")); 572 return(0); 573 } 574 575 /* 576 * lptclose -- close the device, free the local line buffer. 577 * 578 * Check for interrupted write call added. 579 */ 580 581 static int 582 lptclose(dev_t dev, int flags, int fmt, struct proc *p) 583 { 584 u_int unit = LPTUNIT(minor(dev)); 585 struct lpt_data *sc = UNITOSOFTC(unit); 586 device_t lptdev = UNITODEVICE(unit); 587 device_t ppbus = device_get_parent(lptdev); 588 int err; 589 590 if(sc->sc_flags & LP_BYPASS) 591 goto end_close; 592 593 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) 594 return (err); 595 596 sc->sc_state &= ~OPEN; 597 598 /* if the last write was interrupted, don't complete it */ 599 if((!(sc->sc_state & INTERRUPTED)) && (sc->sc_irq & LP_USE_IRQ)) 600 while ((ppb_rstr(ppbus) & 601 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 602 (LPS_SEL|LPS_NBSY|LPS_NERR) || sc->sc_xfercnt) 603 /* wait 1/4 second, give up if we get a signal */ 604 if (tsleep((caddr_t)lptdev, LPPRI|PCATCH, 605 "lpclose", hz) != EWOULDBLOCK) 606 break; 607 608 ppb_wctr(ppbus, LPC_NINIT); 609 free(sc->sc_inbuf, M_LPT); 610 free(sc->sc_statbuf, M_LPT); 611 612 end_close: 613 /* release the bus anyway 614 * unregistration of interrupt forced by release 615 */ 616 lpt_release_ppbus(lptdev); 617 618 sc->sc_state = 0; 619 sc->sc_xfercnt = 0; 620 lprintf(("closed.\n")); 621 return(0); 622 } 623 624 /* 625 * lpt_pushbytes() 626 * Workhorse for actually spinning and writing bytes to printer 627 * Derived from lpa.c 628 * Originally by ? 629 * 630 * This code is only used when we are polling the port 631 */ 632 static int 633 lpt_pushbytes(device_t dev) 634 { 635 struct lpt_data *sc = DEVTOSOFTC(dev); 636 device_t ppbus = device_get_parent(dev); 637 int spin, err, tic; 638 char ch; 639 640 lprintf(("p")); 641 /* loop for every character .. */ 642 while (sc->sc_xfercnt > 0) { 643 /* printer data */ 644 ch = *(sc->sc_cp); 645 sc->sc_cp++; 646 sc->sc_xfercnt--; 647 648 /* 649 * Wait for printer ready. 650 * Loop 20 usecs testing BUSY bit, then sleep 651 * for exponentially increasing timeout. (vak) 652 */ 653 for (spin = 0; NOT_READY(ppbus) && spin < MAX_SPIN; ++spin) 654 DELAY(1); /* XXX delay is NOT this accurate! */ 655 if (spin >= MAX_SPIN) { 656 tic = 0; 657 while (NOT_READY(ppbus)) { 658 /* 659 * Now sleep, every cycle a 660 * little longer .. 661 */ 662 tic = tic + tic + 1; 663 /* 664 * But no more than 10 seconds. (vak) 665 */ 666 if (tic > MAX_SLEEP) 667 tic = MAX_SLEEP; 668 err = tsleep((caddr_t)dev, LPPRI, 669 LPT_NAME "poll", tic); 670 if (err != EWOULDBLOCK) { 671 return (err); 672 } 673 } 674 } 675 676 /* output data */ 677 ppb_wdtr(ppbus, ch); 678 /* strobe */ 679 ppb_wctr(ppbus, sc->sc_control|LPC_STB); 680 ppb_wctr(ppbus, sc->sc_control); 681 682 } 683 return(0); 684 } 685 686 /* 687 * lptread --retrieve printer status in IEEE1284 NIBBLE mode 688 */ 689 690 static int 691 lptread(dev_t dev, struct uio *uio, int ioflag) 692 { 693 u_int unit = LPTUNIT(minor(dev)); 694 struct lpt_data *sc = UNITOSOFTC(unit); 695 device_t lptdev = UNITODEVICE(unit); 696 device_t ppbus = device_get_parent(lptdev); 697 int error = 0, len; 698 699 if (sc->sc_flags & LP_BYPASS) { 700 /* we can't do reads in bypass mode */ 701 return (EPERM); 702 } 703 704 if ((error = ppb_1284_negociate(ppbus, PPB_NIBBLE, 0))) 705 return (error); 706 707 /* read data in an other buffer, read/write may be simultaneous */ 708 len = 0; 709 while (uio->uio_resid) { 710 if ((error = ppb_1284_read(ppbus, PPB_NIBBLE, 711 sc->sc_statbuf, min(BUFSTATSIZE, 712 uio->uio_resid), &len))) { 713 goto error; 714 } 715 716 if (!len) 717 goto error; /* no more data */ 718 719 if ((error = uiomove(sc->sc_statbuf, len, uio))) 720 goto error; 721 } 722 723 error: 724 ppb_1284_terminate(ppbus); 725 return (error); 726 } 727 728 /* 729 * lptwrite --copy a line from user space to a local buffer, then call 730 * putc to get the chars moved to the output queue. 731 * 732 * Flagging of interrupted write added. 733 */ 734 735 static int 736 lptwrite(dev_t dev, struct uio *uio, int ioflag) 737 { 738 register unsigned n; 739 int err; 740 u_int unit = LPTUNIT(minor(dev)); 741 struct lpt_data *sc = UNITOSOFTC(unit); 742 device_t lptdev = UNITODEVICE(unit); 743 device_t ppbus = device_get_parent(lptdev); 744 745 if(sc->sc_flags & LP_BYPASS) { 746 /* we can't do writes in bypass mode */ 747 return(EPERM); 748 } 749 750 /* request the ppbus only if we don't have it already */ 751 /* XXX interrupt registration?! */ 752 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) 753 return (err); 754 755 /* if interrupts are working, register the handler */ 756 if (sc->sc_irq & LP_USE_IRQ) { 757 /* register our interrupt handler */ 758 err = BUS_SETUP_INTR(ppbus, lptdev, sc->intr_resource, 759 INTR_TYPE_TTY, lpt_intr, lptdev, 760 &sc->intr_cookie); 761 if (err) { 762 device_printf(lptdev, "handler registration failed, polled mode.\n"); 763 sc->sc_irq &= ~LP_USE_IRQ; 764 } 765 } 766 767 sc->sc_state &= ~INTERRUPTED; 768 while ((n = min(BUFSIZE, uio->uio_resid)) != 0) { 769 sc->sc_cp = sc->sc_inbuf; 770 uiomove(sc->sc_cp, n, uio); 771 sc->sc_xfercnt = n ; 772 773 if (sc->sc_irq & LP_ENABLE_EXT) { 774 /* try any extended mode */ 775 err = ppb_write(ppbus, sc->sc_cp, 776 sc->sc_xfercnt, 0); 777 switch (err) { 778 case 0: 779 /* if not all data was sent, we could rely 780 * on polling for the last bytes */ 781 sc->sc_xfercnt = 0; 782 break; 783 case EINTR: 784 sc->sc_state |= INTERRUPTED; 785 return(err); 786 case EINVAL: 787 /* advanced mode not avail */ 788 log(LOG_NOTICE, LPT_NAME "%d: advanced mode not avail, polling\n", unit); 789 break; 790 default: 791 return(err); 792 } 793 } else while ((sc->sc_xfercnt > 0)&&(sc->sc_irq & LP_USE_IRQ)) { 794 lprintf(("i")); 795 /* if the printer is ready for a char, */ 796 /* give it one */ 797 if ((sc->sc_state & OBUSY) == 0){ 798 lprintf(("\nC %d. ", sc->sc_xfercnt)); 799 lptintr(lptdev); 800 } 801 lprintf(("W ")); 802 if (sc->sc_state & OBUSY) 803 if ((err = tsleep((caddr_t)lptdev, 804 LPPRI|PCATCH, LPT_NAME "write", 0))) { 805 sc->sc_state |= INTERRUPTED; 806 return(err); 807 } 808 } 809 810 /* check to see if we must do a polled write */ 811 if(!(sc->sc_irq & LP_USE_IRQ) && (sc->sc_xfercnt)) { 812 lprintf(("p")); 813 814 err = lpt_pushbytes(lptdev); 815 816 if (err) 817 return(err); 818 } 819 } 820 821 /* we have not been interrupted, release the ppbus */ 822 lpt_release_ppbus(lptdev); 823 824 return(0); 825 } 826 827 /* 828 * lpt_intr -- handle printer interrupts which occur when the printer is 829 * ready to accept another char. 830 * 831 * do checking for interrupted write call. 832 */ 833 834 static void 835 lpt_intr(void *arg) 836 { 837 device_t lptdev = (device_t)arg; 838 device_t ppbus = device_get_parent(lptdev); 839 struct lpt_data *sc = DEVTOSOFTC(lptdev); 840 int sts = 0; 841 int i; 842 843 /* we must own the bus to use it */ 844 if ((sc->sc_state & HAVEBUS) == 0) 845 return; 846 847 /* 848 * Is printer online and ready for output? 849 * 850 * Avoid falling back to lptout() too quickly. First spin-loop 851 * to see if the printer will become ready ``really soon now''. 852 */ 853 for (i = 0; i < 100 && 854 ((sts=ppb_rstr(ppbus)) & RDY_MASK) != LP_READY; i++) ; 855 856 if ((sts & RDY_MASK) == LP_READY) { 857 sc->sc_state = (sc->sc_state | OBUSY) & ~EERROR; 858 sc->sc_backoff = hz/LPTOUTINITIAL; 859 860 if (sc->sc_xfercnt) { 861 /* send char */ 862 /*lprintf(("%x ", *sc->sc_cp)); */ 863 ppb_wdtr(ppbus, *sc->sc_cp++) ; 864 ppb_wctr(ppbus, sc->sc_control|LPC_STB); 865 /* DELAY(X) */ 866 ppb_wctr(ppbus, sc->sc_control); 867 868 /* any more data for printer */ 869 if(--(sc->sc_xfercnt) > 0) return; 870 } 871 872 /* 873 * No more data waiting for printer. 874 * Wakeup is not done if write call was not interrupted. 875 */ 876 sc->sc_state &= ~OBUSY; 877 878 if(!(sc->sc_state & INTERRUPTED)) 879 wakeup((caddr_t)lptdev); 880 lprintf(("w ")); 881 return; 882 } else { /* check for error */ 883 if(((sts & (LPS_NERR | LPS_OUT) ) != LPS_NERR) && 884 (sc->sc_state & OPEN)) 885 sc->sc_state |= EERROR; 886 /* lptout() will jump in and try to restart. */ 887 } 888 lprintf(("sts %x ", sts)); 889 } 890 891 static void 892 lptintr(device_t dev) 893 { 894 /* call the interrupt at required spl level */ 895 int s = spltty(); 896 897 lpt_intr(dev); 898 899 splx(s); 900 return; 901 } 902 903 static int 904 lptioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct proc *p) 905 { 906 int error = 0; 907 u_int unit = LPTUNIT(minor(dev)); 908 struct lpt_data *sc = UNITOSOFTC(unit); 909 u_char old_sc_irq; /* old printer IRQ status */ 910 911 switch (cmd) { 912 case LPT_IRQ : 913 if(sc->sc_irq & LP_HAS_IRQ) { 914 /* 915 * NOTE: 916 * If the IRQ status is changed, 917 * this will only be visible on the 918 * next open. 919 * 920 * If interrupt status changes, 921 * this gets syslog'd. 922 */ 923 old_sc_irq = sc->sc_irq; 924 switch(*(int*)data) { 925 case 0: 926 sc->sc_irq &= (~LP_ENABLE_IRQ); 927 break; 928 case 1: 929 sc->sc_irq &= (~LP_ENABLE_EXT); 930 sc->sc_irq |= LP_ENABLE_IRQ; 931 break; 932 case 2: 933 /* classic irq based transfer and advanced 934 * modes are in conflict 935 */ 936 sc->sc_irq &= (~LP_ENABLE_IRQ); 937 sc->sc_irq |= LP_ENABLE_EXT; 938 break; 939 case 3: 940 sc->sc_irq &= (~LP_ENABLE_EXT); 941 break; 942 default: 943 break; 944 } 945 946 if (old_sc_irq != sc->sc_irq ) 947 log(LOG_NOTICE, LPT_NAME "%d: switched to %s %s mode\n", 948 unit, 949 (sc->sc_irq & LP_ENABLE_IRQ)? 950 "interrupt-driven":"polled", 951 (sc->sc_irq & LP_ENABLE_EXT)? 952 "extended":"standard"); 953 } else /* polled port */ 954 error = EOPNOTSUPP; 955 break; 956 default: 957 error = ENODEV; 958 } 959 960 return(error); 961 } 962 963 static device_method_t lpt_methods[] = { 964 /* device interface */ 965 DEVMETHOD(device_identify, lpt_identify), 966 DEVMETHOD(device_probe, lpt_probe), 967 DEVMETHOD(device_attach, lpt_attach), 968 969 { 0, 0 } 970 }; 971 972 static driver_t lpt_driver = { 973 LPT_NAME, 974 lpt_methods, 975 sizeof(struct lpt_data), 976 }; 977 978 DRIVER_MODULE(lpt, ppbus, lpt_driver, lpt_devclass, 0, 0); 979