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: src/sys/dev/ppbus/lpt.c,v 1.15.2.3 2000/07/07 00:30:40 obrien Exp $ 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/device.h> 72 #include <sys/kernel.h> 73 #include <sys/uio.h> 74 #include <sys/syslog.h> 75 #include <sys/thread2.h> 76 #include <sys/malloc.h> 77 #include <sys/rman.h> 78 79 #include <machine/clock.h> 80 #include <machine/inttypes.h> 81 82 #include "lptio.h" 83 #include <bus/ppbus/ppbconf.h> 84 #include <bus/ppbus/ppb_1284.h> 85 #include "lpt.h" 86 #include "ppbus_if.h" 87 #include <bus/ppbus/ppbio.h> 88 89 MALLOC_DEFINE(M_LPT, "lpt", "LPT buffers"); 90 91 #ifndef LPT_DEBUG 92 #define lprintf(args) 93 #else 94 #define lprintf(args) \ 95 do { \ 96 if (lptflag) \ 97 kprintf args; \ 98 } while (0) 99 static int volatile lptflag = 1; 100 #endif 101 102 #define LPINITRDY 4 /* wait up to 4 seconds for a ready */ 103 #define LPTOUTINITIAL 10 /* initial timeout to wait for ready 1/10 s */ 104 #define LPTOUTMAX 1 /* maximal timeout 1 s */ 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 short sc_state; 113 /* default case: negative prime, negative ack, handshake strobe, 114 prime once */ 115 u_char sc_control; 116 char sc_flags; 117 #define LP_UNITMASK 0x03 /* up to 4 units */ 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 struct callout sc_callout; 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 #define HAVEBUS (1<<8) /* the driver owns the bus */ 170 171 /* status masks to interrogate printer status */ 172 #define RDY_MASK (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR) /* ready ? */ 173 #define LP_READY (LPS_SEL|LPS_NBSY|LPS_NERR) 174 175 /* Printer Ready condition - from lpa.c */ 176 /* Only used in polling code */ 177 #define LPS_INVERT (LPS_NBSY | LPS_NACK | LPS_SEL | LPS_NERR) 178 #define LPS_MASK (LPS_NBSY | LPS_NACK | LPS_OUT | LPS_SEL | LPS_NERR) 179 #define NOT_READY(ppbus) ((ppb_rstr(ppbus)^LPS_INVERT)&LPS_MASK) 180 181 #define MAX_SLEEP (hz*5) /* Timeout while waiting for device ready */ 182 #define MAX_SPIN 20 /* Max delay for device ready in usecs */ 183 184 185 static d_open_t lptopen; 186 static d_close_t lptclose; 187 static d_write_t lptwrite; 188 static d_read_t lptread; 189 static d_ioctl_t lptioctl; 190 191 static struct dev_ops lpt_ops = { 192 { LPT_NAME, 0, 0 }, 193 .d_open = lptopen, 194 .d_close = lptclose, 195 .d_read = lptread, 196 .d_write = lptwrite, 197 .d_ioctl = lptioctl, 198 }; 199 200 static int 201 lpt_request_ppbus(device_t dev, int how) 202 { 203 device_t ppbus = device_get_parent(dev); 204 struct lpt_data *sc = DEVTOSOFTC(dev); 205 int error; 206 207 if (sc->sc_state & HAVEBUS) 208 return (0); 209 210 /* we have the bus only if the request succeeded */ 211 if ((error = ppb_request_bus(ppbus, dev, how)) == 0) 212 sc->sc_state |= HAVEBUS; 213 214 return (error); 215 } 216 217 static int 218 lpt_release_ppbus(device_t dev) 219 { 220 device_t ppbus = device_get_parent(dev); 221 struct lpt_data *sc = DEVTOSOFTC(dev); 222 int error = 0; 223 224 if ((error = ppb_release_bus(ppbus, dev)) == 0) 225 sc->sc_state &= ~HAVEBUS; 226 227 return (error); 228 } 229 230 /* 231 * Internal routine to lptprobe to do port tests of one byte value 232 */ 233 static int 234 lpt_port_test(device_t ppbus, u_char data, u_char mask) 235 { 236 int temp, timeout; 237 238 data = data & mask; 239 ppb_wdtr(ppbus, data); 240 timeout = 10000; 241 do { 242 DELAY(10); 243 temp = ppb_rdtr(ppbus) & mask; 244 } 245 while (temp != data && --timeout); 246 lprintf(("out=%x\tin=%x\ttout=%d\n", data, temp, timeout)); 247 return (temp == data); 248 } 249 250 /* 251 * Probe simplified by replacing multiple loops with a hardcoded 252 * test pattern - 1999/02/08 des@freebsd.org 253 * 254 * New lpt port probe Geoff Rehmet - Rhodes University - 14/2/94 255 * Based partially on Rod Grimes' printer probe 256 * 257 * Logic: 258 * 1) If no port address was given, use the bios detected ports 259 * and autodetect what ports the printers are on. 260 * 2) Otherwise, probe the data port at the address given, 261 * using the method in Rod Grimes' port probe. 262 * (Much code ripped off directly from Rod's probe.) 263 * 264 * Comments from Rod's probe: 265 * Logic: 266 * 1) You should be able to write to and read back the same value 267 * to the data port. Do an alternating zeros, alternating ones, 268 * walking zero, and walking one test to check for stuck bits. 269 * 270 * 2) You should be able to write to and read back the same value 271 * to the control port lower 5 bits, the upper 3 bits are reserved 272 * per the IBM PC technical reference manauls and different boards 273 * do different things with them. Do an alternating zeros, alternating 274 * ones, walking zero, and walking one test to check for stuck bits. 275 * 276 * Some printers drag the strobe line down when the are powered off 277 * so this bit has been masked out of the control port test. 278 * 279 * XXX Some printers may not like a fast pulse on init or strobe, I 280 * don't know at this point, if that becomes a problem these bits 281 * should be turned off in the mask byte for the control port test. 282 * 283 * We are finally left with a mask of 0x14, due to some printers 284 * being adamant about holding other bits high ........ 285 * 286 * Before probing the control port, we write a 0 to the data port - 287 * If not, some printers chuck out garbage when the strobe line 288 * gets toggled. 289 * 290 * 3) Set the data and control ports to a value of 0 291 * 292 * This probe routine has been tested on Epson Lx-800, HP LJ3P, 293 * Epson FX-1170 and C.Itoh 8510RM 294 * printers. 295 * Quick exit on fail added. 296 */ 297 static int 298 lpt_detect(device_t dev) 299 { 300 device_t ppbus = device_get_parent(dev); 301 302 static u_char testbyte[18] = { 303 0x55, /* alternating zeros */ 304 0xaa, /* alternating ones */ 305 0xfe, 0xfd, 0xfb, 0xf7, 306 0xef, 0xdf, 0xbf, 0x7f, /* walking zero */ 307 0x01, 0x02, 0x04, 0x08, 308 0x10, 0x20, 0x40, 0x80 /* walking one */ 309 }; 310 int i, error, status; 311 312 status = 1; /* assume success */ 313 314 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) { 315 kprintf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error); 316 status = 0; 317 goto end_probe; 318 } 319 320 for (i = 0; i < 18 && status; i++) 321 if (!lpt_port_test(ppbus, testbyte[i], 0xff)) { 322 status = 0; 323 goto end_probe; 324 } 325 326 end_probe: 327 /* write 0's to control and data ports */ 328 ppb_wdtr(ppbus, 0); 329 ppb_wctr(ppbus, 0); 330 331 lpt_release_ppbus(dev); 332 333 return (status); 334 } 335 336 /* 337 * lpt_probe() 338 */ 339 static int 340 lpt_probe(device_t dev) 341 { 342 struct lpt_data *sc; 343 344 sc = DEVTOSOFTC(dev); 345 bzero(sc, sizeof(struct lpt_data)); 346 347 /* 348 * Now, try to detect the printer. 349 */ 350 if (!lpt_detect(dev)) 351 return (ENXIO); 352 353 device_set_desc(dev, "Printer"); 354 355 return (0); 356 } 357 358 static int 359 lpt_attach(device_t dev) 360 { 361 device_t ppbus = device_get_parent(dev); 362 struct lpt_data *sc = DEVTOSOFTC(dev); 363 int zero = 0, unit = device_get_unit(dev); 364 int error; 365 uintptr_t irq; 366 367 sc->sc_primed = 0; /* not primed yet */ 368 callout_init(&sc->sc_callout); 369 370 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) { 371 kprintf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error); 372 return (0); 373 } 374 375 ppb_wctr(ppbus, LPC_NINIT); 376 377 /* check if we can use interrupt, should be done by ppc stuff */ 378 lprintf(("oldirq %x\n", sc->sc_irq)); 379 380 /* retrieve the ppbus irq */ 381 BUS_READ_IVAR(ppbus, dev, PPBUS_IVAR_IRQ, &irq); 382 383 if (irq > 0) { 384 /* declare our interrupt handler */ 385 sc->intr_resource = bus_alloc_legacy_irq_resource(dev, &zero, 386 irq, RF_SHAREABLE); 387 } 388 if (sc->intr_resource) { 389 sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ; 390 device_printf(dev, "Interrupt-driven port\n"); 391 } else { 392 sc->sc_irq = 0; 393 device_printf(dev, "Polled port\n"); 394 } 395 lprintf(("irq %"PRIxPTR" %x\n", irq, sc->sc_irq)); 396 397 lpt_release_ppbus(dev); 398 399 make_dev(&lpt_ops, unit, UID_ROOT, GID_WHEEL, 400 0600, LPT_NAME "%d", unit); 401 make_dev(&lpt_ops, unit | LP_BYPASS, UID_ROOT, GID_WHEEL, 402 0600, LPT_NAME "%d.ctl", unit); 403 return (0); 404 } 405 406 static void 407 lptout(void *arg) 408 { 409 device_t dev = (device_t)arg; 410 struct lpt_data *sc = DEVTOSOFTC(dev); 411 #ifdef LPT_DEBUG 412 device_t ppbus = device_get_parent(dev); 413 #endif 414 415 lprintf(("T %x ", ppb_rstr(ppbus))); 416 if (sc->sc_state & OPEN) { 417 sc->sc_backoff++; 418 if (sc->sc_backoff > hz/LPTOUTMAX) 419 sc->sc_backoff = sc->sc_backoff > hz/LPTOUTMAX; 420 callout_reset(&sc->sc_callout, sc->sc_backoff, lptout, dev); 421 } else { 422 sc->sc_state &= ~TOUT; 423 } 424 425 if (sc->sc_state & EERROR) 426 sc->sc_state &= ~EERROR; 427 428 /* 429 * Avoid possible hangs due to missed interrupts 430 */ 431 if (sc->sc_xfercnt) { 432 lptintr(dev); 433 } else { 434 sc->sc_state &= ~OBUSY; 435 wakeup((caddr_t)dev); 436 } 437 } 438 439 /* 440 * lptopen -- reset the printer, then wait until it's selected and not busy. 441 * If LP_BYPASS flag is selected, then we do not try to select the 442 * printer -- this is just used for passing ioctls. 443 */ 444 445 static int 446 lptopen(struct dev_open_args *ap) 447 { 448 cdev_t dev = ap->a_head.a_dev; 449 int trys, err; 450 u_int unit = LPTUNIT(minor(dev)); 451 struct lpt_data *sc = UNITOSOFTC(unit); 452 device_t lptdev = UNITODEVICE(unit); 453 device_t ppbus = device_get_parent(lptdev); 454 455 if (!sc) 456 return (ENXIO); 457 458 if (sc->sc_state) { 459 lprintf((LPT_NAME ": still open %x\n", sc->sc_state)); 460 return(EBUSY); 461 } else 462 sc->sc_state |= LPTINIT; 463 464 sc->sc_flags = LPTFLAGS(minor(dev)); 465 466 /* Check for open with BYPASS flag set. */ 467 if (sc->sc_flags & LP_BYPASS) { 468 sc->sc_state = OPEN; 469 return(0); 470 } 471 472 /* request the ppbus only if we don't have it already */ 473 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) { 474 /* give it a chance to try later */ 475 sc->sc_state = 0; 476 return (err); 477 } 478 479 crit_enter(); 480 lprintf((LPT_NAME " flags 0x%x\n", sc->sc_flags)); 481 482 /* set IRQ status according to ENABLE_IRQ flag 483 */ 484 if (sc->sc_irq & LP_ENABLE_IRQ) 485 sc->sc_irq |= LP_USE_IRQ; 486 else 487 sc->sc_irq &= ~LP_USE_IRQ; 488 489 /* init printer */ 490 if ((sc->sc_flags & LP_NO_PRIME) == 0) { 491 if ((sc->sc_flags & LP_PRIMEOPEN) || sc->sc_primed == 0) { 492 ppb_wctr(ppbus, 0); 493 sc->sc_primed++; 494 DELAY(500); 495 } 496 } 497 498 ppb_wctr(ppbus, LPC_SEL|LPC_NINIT); 499 500 /* wait till ready (printer running diagnostics) */ 501 trys = 0; 502 do { 503 /* ran out of waiting for the printer */ 504 if (trys++ >= LPINITRDY*4) { 505 crit_exit(); 506 sc->sc_state = 0; 507 lprintf(("status %x\n", ppb_rstr(ppbus))); 508 509 lpt_release_ppbus(lptdev); 510 return (EBUSY); 511 } 512 513 /* wait 1/4 second, give up if we get a signal */ 514 if (tsleep((caddr_t)lptdev, PCATCH, "lptinit", hz/4) != 515 EWOULDBLOCK) { 516 sc->sc_state = 0; 517 crit_exit(); 518 519 lpt_release_ppbus(lptdev); 520 return (EBUSY); 521 } 522 523 /* is printer online and ready for output */ 524 } while ((ppb_rstr(ppbus) & 525 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 526 (LPS_SEL|LPS_NBSY|LPS_NERR)); 527 528 sc->sc_control = LPC_SEL|LPC_NINIT; 529 if (sc->sc_flags & LP_AUTOLF) 530 sc->sc_control |= LPC_AUTOL; 531 532 /* enable interrupt if interrupt-driven */ 533 if (sc->sc_irq & LP_USE_IRQ) 534 sc->sc_control |= LPC_ENA; 535 536 ppb_wctr(ppbus, sc->sc_control); 537 538 sc->sc_state = OPEN; 539 sc->sc_inbuf = kmalloc(BUFSIZE, M_LPT, M_WAITOK); 540 sc->sc_statbuf = kmalloc(BUFSTATSIZE, M_LPT, M_WAITOK); 541 sc->sc_xfercnt = 0; 542 543 crit_exit(); 544 545 /* release the ppbus */ 546 lpt_release_ppbus(lptdev); 547 548 /* only use timeout if using interrupt */ 549 lprintf(("irq %x\n", sc->sc_irq)); 550 if (sc->sc_irq & LP_USE_IRQ) { 551 sc->sc_state |= TOUT; 552 sc->sc_backoff = hz / LPTOUTINITIAL; 553 callout_reset(&sc->sc_callout, sc->sc_backoff, lptout, lptdev); 554 } 555 556 lprintf(("opened.\n")); 557 return(0); 558 } 559 560 /* 561 * lptclose -- close the device, free the local line buffer. 562 * 563 * Check for interrupted write call added. 564 */ 565 566 static int 567 lptclose(struct dev_close_args *ap) 568 { 569 cdev_t dev = ap->a_head.a_dev; 570 u_int unit = LPTUNIT(minor(dev)); 571 struct lpt_data *sc = UNITOSOFTC(unit); 572 device_t lptdev = UNITODEVICE(unit); 573 device_t ppbus = device_get_parent(lptdev); 574 int err; 575 576 if(sc->sc_flags & LP_BYPASS) 577 goto end_close; 578 579 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) 580 return (err); 581 582 sc->sc_state &= ~OPEN; 583 584 /* if the last write was interrupted, don't complete it */ 585 if((!(sc->sc_state & INTERRUPTED)) && (sc->sc_irq & LP_USE_IRQ)) { 586 while ((ppb_rstr(ppbus) & 587 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 588 (LPS_SEL|LPS_NBSY|LPS_NERR) || sc->sc_xfercnt) { 589 /* wait 1/4 second, give up if we get a signal */ 590 if (tsleep((caddr_t)lptdev, PCATCH, 591 "lpclose", hz) != EWOULDBLOCK) { 592 break; 593 } 594 } 595 } 596 callout_stop(&sc->sc_callout); 597 ppb_wctr(ppbus, LPC_NINIT); 598 kfree(sc->sc_inbuf, M_LPT); 599 kfree(sc->sc_statbuf, M_LPT); 600 601 end_close: 602 /* release the bus anyway 603 * unregistration of interrupt forced by release 604 */ 605 lpt_release_ppbus(lptdev); 606 607 sc->sc_state = 0; 608 sc->sc_xfercnt = 0; 609 lprintf(("closed.\n")); 610 return(0); 611 } 612 613 /* 614 * lpt_pushbytes() 615 * Workhorse for actually spinning and writing bytes to printer 616 * Derived from lpa.c 617 * Originally by ? 618 * 619 * This code is only used when we are polling the port 620 */ 621 static int 622 lpt_pushbytes(device_t dev) 623 { 624 struct lpt_data *sc = DEVTOSOFTC(dev); 625 device_t ppbus = device_get_parent(dev); 626 int spin, err, tic; 627 char ch; 628 629 lprintf(("p")); 630 /* loop for every character .. */ 631 while (sc->sc_xfercnt > 0) { 632 /* printer data */ 633 ch = *(sc->sc_cp); 634 sc->sc_cp++; 635 sc->sc_xfercnt--; 636 637 /* 638 * Wait for printer ready. 639 * Loop 20 usecs testing BUSY bit, then sleep 640 * for exponentially increasing timeout. (vak) 641 */ 642 for (spin = 0; NOT_READY(ppbus) && spin < MAX_SPIN; ++spin) 643 DELAY(1); /* XXX delay is NOT this accurate! */ 644 if (spin >= MAX_SPIN) { 645 tic = 0; 646 while (NOT_READY(ppbus)) { 647 /* 648 * Now sleep, every cycle a 649 * little longer .. 650 */ 651 tic = tic + tic + 1; 652 /* 653 * But no more than 10 seconds. (vak) 654 */ 655 if (tic > MAX_SLEEP) 656 tic = MAX_SLEEP; 657 err = tsleep((caddr_t)dev, 0, 658 LPT_NAME "poll", tic); 659 if (err != EWOULDBLOCK) { 660 return (err); 661 } 662 } 663 } 664 665 /* output data */ 666 ppb_wdtr(ppbus, ch); 667 /* strobe */ 668 ppb_wctr(ppbus, sc->sc_control|LPC_STB); 669 ppb_wctr(ppbus, sc->sc_control); 670 671 } 672 return(0); 673 } 674 675 /* 676 * lptread --retrieve printer status in IEEE1284 NIBBLE mode 677 */ 678 679 static int 680 lptread(struct dev_read_args *ap) 681 { 682 cdev_t dev = ap->a_head.a_dev; 683 struct uio *uio = ap->a_uio; 684 u_int unit = LPTUNIT(minor(dev)); 685 struct lpt_data *sc = UNITOSOFTC(unit); 686 device_t lptdev = UNITODEVICE(unit); 687 device_t ppbus = device_get_parent(lptdev); 688 int error = 0, len; 689 690 if (sc->sc_flags & LP_BYPASS) { 691 /* we can't do reads in bypass mode */ 692 return (EPERM); 693 } 694 695 if ((error = ppb_1284_negotiate(ppbus, PPB_NIBBLE, 0))) 696 return (error); 697 698 /* read data in an other buffer, read/write may be simultaneous */ 699 len = 0; 700 while (uio->uio_resid) { 701 error = ppb_1284_read(ppbus, PPB_NIBBLE, sc->sc_statbuf, 702 (int)szmin(BUFSTATSIZE, uio->uio_resid), 703 &len); 704 if (error) 705 goto error; 706 707 if (!len) 708 goto error; /* no more data */ 709 710 if ((error = uiomove(sc->sc_statbuf, (size_t)len, uio))) 711 goto error; 712 } 713 714 error: 715 ppb_1284_terminate(ppbus); 716 return (error); 717 } 718 719 /* 720 * lptwrite --copy a line from user space to a local buffer, then call 721 * putc to get the chars moved to the output queue. 722 * 723 * Flagging of interrupted write added. 724 */ 725 726 static int 727 lptwrite(struct dev_write_args *ap) 728 { 729 cdev_t dev = ap->a_head.a_dev; 730 struct uio *uio = ap->a_uio; 731 unsigned n; 732 int err; 733 u_int unit = LPTUNIT(minor(dev)); 734 struct lpt_data *sc = UNITOSOFTC(unit); 735 device_t lptdev = UNITODEVICE(unit); 736 device_t ppbus = device_get_parent(lptdev); 737 738 if (sc->sc_flags & LP_BYPASS) { 739 /* we can't do writes in bypass mode */ 740 return (EPERM); 741 } 742 743 /* request the ppbus only if we don't have it already */ 744 /* XXX interrupt registration?! */ 745 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) 746 return (err); 747 748 /* if interrupts are working, register the handler */ 749 if (sc->sc_irq & LP_USE_IRQ) { 750 /* register our interrupt handler */ 751 err = BUS_SETUP_INTR(ppbus, lptdev, sc->intr_resource, 752 0, lpt_intr, lptdev, 753 &sc->intr_cookie, NULL, NULL); 754 if (err) { 755 device_printf(lptdev, "handler registration failed, polled mode.\n"); 756 sc->sc_irq &= ~LP_USE_IRQ; 757 } 758 } 759 760 sc->sc_state &= ~INTERRUPTED; 761 while ((n = (unsigned)szmin(BUFSIZE, uio->uio_resid)) != 0) { 762 sc->sc_cp = sc->sc_inbuf; 763 uiomove(sc->sc_cp, (size_t)n, uio); 764 sc->sc_xfercnt = n; 765 766 if (sc->sc_irq & LP_ENABLE_EXT) { 767 /* try any extended mode */ 768 err = ppb_write(ppbus, sc->sc_cp, 769 sc->sc_xfercnt, 0); 770 switch (err) { 771 case 0: 772 /* if not all data was sent, we could rely 773 * on polling for the last bytes */ 774 sc->sc_xfercnt = 0; 775 break; 776 case EINTR: 777 sc->sc_state |= INTERRUPTED; 778 return (err); 779 case EINVAL: 780 /* advanced mode not avail */ 781 log(LOG_NOTICE, LPT_NAME "%d: advanced mode not avail, polling\n", unit); 782 break; 783 default: 784 return (err); 785 } 786 } else while ((sc->sc_xfercnt > 0)&&(sc->sc_irq & LP_USE_IRQ)) { 787 lprintf(("i")); 788 /* if the printer is ready for a char, */ 789 /* give it one */ 790 if ((sc->sc_state & OBUSY) == 0){ 791 lprintf(("\nC %d. ", sc->sc_xfercnt)); 792 lptintr(lptdev); 793 } 794 lprintf(("W ")); 795 if (sc->sc_state & OBUSY) 796 if ((err = tsleep((caddr_t)lptdev, 797 PCATCH, LPT_NAME "write", 0))) { 798 sc->sc_state |= INTERRUPTED; 799 return(err); 800 } 801 } 802 803 /* check to see if we must do a polled write */ 804 if (!(sc->sc_irq & LP_USE_IRQ) && (sc->sc_xfercnt)) { 805 lprintf(("p")); 806 807 err = lpt_pushbytes(lptdev); 808 809 if (err) 810 return (err); 811 } 812 } 813 814 /* we have not been interrupted, release the ppbus */ 815 lpt_release_ppbus(lptdev); 816 817 return (0); 818 } 819 820 /* 821 * lpt_intr -- handle printer interrupts which occur when the printer is 822 * ready to accept another char. 823 * 824 * do checking for interrupted write call. 825 */ 826 827 static void 828 lpt_intr(void *arg) 829 { 830 device_t lptdev = (device_t)arg; 831 device_t ppbus = device_get_parent(lptdev); 832 struct lpt_data *sc = DEVTOSOFTC(lptdev); 833 int sts = 0; 834 int i; 835 836 /* we must own the bus to use it */ 837 if ((sc->sc_state & HAVEBUS) == 0) 838 return; 839 840 /* 841 * Is printer online and ready for output? 842 * 843 * Avoid falling back to lptout() too quickly. First spin-loop 844 * to see if the printer will become ready ``really soon now''. 845 */ 846 for (i = 0; i < 100 && 847 ((sts=ppb_rstr(ppbus)) & RDY_MASK) != LP_READY; i++) ; 848 849 if ((sts & RDY_MASK) == LP_READY) { 850 sc->sc_state = (sc->sc_state | OBUSY) & ~EERROR; 851 sc->sc_backoff = hz / LPTOUTINITIAL; 852 853 if (sc->sc_xfercnt) { 854 /* send char */ 855 /*lprintf(("%x ", *sc->sc_cp)); */ 856 ppb_wdtr(ppbus, *sc->sc_cp++) ; 857 ppb_wctr(ppbus, sc->sc_control|LPC_STB); 858 /* DELAY(X) */ 859 ppb_wctr(ppbus, sc->sc_control); 860 861 /* any more data for printer */ 862 if (--(sc->sc_xfercnt) > 0) 863 return; 864 } 865 866 /* 867 * No more data waiting for printer. 868 * Wakeup is not done if write call was not interrupted. 869 */ 870 sc->sc_state &= ~OBUSY; 871 872 if (!(sc->sc_state & INTERRUPTED)) 873 wakeup((caddr_t)lptdev); 874 lprintf(("w ")); 875 return; 876 } else { /* check for error */ 877 if (((sts & (LPS_NERR | LPS_OUT) ) != LPS_NERR) && 878 (sc->sc_state & OPEN)) 879 sc->sc_state |= EERROR; 880 /* lptout() will jump in and try to restart. */ 881 } 882 lprintf(("sts %x ", sts)); 883 } 884 885 static void 886 lptintr(device_t dev) 887 { 888 /* call the interrupt at required spl level */ 889 crit_enter(); 890 891 lpt_intr(dev); 892 893 crit_exit(); 894 } 895 896 static int 897 lptioctl(struct dev_ioctl_args *ap) 898 { 899 cdev_t dev = ap->a_head.a_dev; 900 int error = 0; 901 u_int unit = LPTUNIT(minor(dev)); 902 struct lpt_data *sc = UNITOSOFTC(unit); 903 u_char old_sc_irq; /* old printer IRQ status */ 904 905 switch (ap->a_cmd) { 906 case LPT_IRQ : 907 if (sc->sc_irq & LP_HAS_IRQ) { 908 /* 909 * NOTE: 910 * If the IRQ status is changed, 911 * this will only be visible on the 912 * next open. 913 * 914 * If interrupt status changes, 915 * this gets syslog'd. 916 */ 917 old_sc_irq = sc->sc_irq; 918 switch (*(int*)ap->a_data) { 919 case 0: 920 sc->sc_irq &= (~LP_ENABLE_IRQ); 921 break; 922 case 1: 923 sc->sc_irq &= (~LP_ENABLE_EXT); 924 sc->sc_irq |= LP_ENABLE_IRQ; 925 break; 926 case 2: 927 /* classic irq based transfer and advanced 928 * modes are in conflict 929 */ 930 sc->sc_irq &= (~LP_ENABLE_IRQ); 931 sc->sc_irq |= LP_ENABLE_EXT; 932 break; 933 case 3: 934 sc->sc_irq &= (~LP_ENABLE_EXT); 935 break; 936 default: 937 break; 938 } 939 940 if (old_sc_irq != sc->sc_irq ) 941 log(LOG_NOTICE, LPT_NAME "%d: switched to %s %s mode\n", 942 unit, 943 (sc->sc_irq & LP_ENABLE_IRQ)? 944 "interrupt-driven":"polled", 945 (sc->sc_irq & LP_ENABLE_EXT)? 946 "extended":"standard"); 947 } else /* polled port */ 948 error = EOPNOTSUPP; 949 break; 950 default: 951 error = ENODEV; 952 } 953 954 return(error); 955 } 956 957 /* 958 * Because lpt is a static device that always exists under a ppbus device, 959 * and not scanned by the ppbus device, we need an identify function to 960 * install its device. 961 */ 962 static device_method_t lpt_methods[] = { 963 /* device interface */ 964 DEVMETHOD(device_identify, bus_generic_identify), 965 DEVMETHOD(device_probe, lpt_probe), 966 DEVMETHOD(device_attach, lpt_attach), 967 968 DEVMETHOD_END 969 }; 970 971 static driver_t lpt_driver = { 972 LPT_NAME, 973 lpt_methods, 974 sizeof(struct lpt_data), 975 }; 976 977 DRIVER_MODULE(lpt, ppbus, lpt_driver, lpt_devclass, NULL, NULL); 978