olpt.c revision 126076
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 * $FreeBSD: head/sys/pc98/cbus/olpt.c 126076 2004-02-21 19:42:58Z phk $ 50 */ 51 52/* 53 * Device Driver for AT parallel printer port 54 * Written by William Jolitz 12/18/90 55 */ 56 57/* 58 * Parallel port TCP/IP interfaces added. I looked at the driver from 59 * MACH but this is a complete rewrite, and btw. incompatible, and it 60 * should perform better too. I have never run the MACH driver though. 61 * 62 * This driver sends two bytes (0x08, 0x00) in front of each packet, 63 * to allow us to distinguish another format later. 64 * 65 * Now added a Linux/Crynwr compatibility mode which is enabled using 66 * IF_LINK0 - Tim Wilkinson. 67 * 68 * TODO: 69 * Make HDLC/PPP mode, use IF_LLC1 to enable. 70 * 71 * Connect the two computers using a Laplink parallel cable to use this 72 * feature: 73 * 74 * +----------------------------------------+ 75 * |A-name A-End B-End Descr. Port/Bit | 76 * +----------------------------------------+ 77 * |DATA0 2 15 Data 0/0x01 | 78 * |-ERROR 15 2 1/0x08 | 79 * +----------------------------------------+ 80 * |DATA1 3 13 Data 0/0x02 | 81 * |+SLCT 13 3 1/0x10 | 82 * +----------------------------------------+ 83 * |DATA2 4 12 Data 0/0x04 | 84 * |+PE 12 4 1/0x20 | 85 * +----------------------------------------+ 86 * |DATA3 5 10 Strobe 0/0x08 | 87 * |-ACK 10 5 1/0x40 | 88 * +----------------------------------------+ 89 * |DATA4 6 11 Data 0/0x10 | 90 * |BUSY 11 6 1/~0x80 | 91 * +----------------------------------------+ 92 * |GND 18-25 18-25 GND - | 93 * +----------------------------------------+ 94 * 95 * Expect transfer-rates up to 75 kbyte/sec. 96 * 97 * If GCC could correctly grok 98 * register int port asm("edx") 99 * the code would be cleaner 100 * 101 * Poul-Henning Kamp <phk@freebsd.org> 102 */ 103 104#include <sys/param.h> 105#include <sys/systm.h> 106#include <sys/conf.h> 107#include <sys/bus.h> 108#include <sys/kernel.h> 109#include <sys/uio.h> 110#include <sys/syslog.h> 111#include <sys/malloc.h> 112 113#include <machine/clock.h> 114#include <machine/bus.h> 115#include <machine/resource.h> 116#include <sys/rman.h> 117 118#include <isa/isavar.h> 119 120#include <i386/isa/lptreg.h> 121#include <dev/ppbus/lptio.h> 122 123#define LPINITRDY 4 /* wait up to 4 seconds for a ready */ 124#define LPTOUTINITIAL 10 /* initial timeout to wait for ready 1/10 s */ 125#define LPTOUTMAX 1 /* maximal timeout 1 s */ 126#define LPPRI (PZERO+8) 127#define BUFSIZE 1024 128 129#ifndef PC98 130/* BIOS printer list - used by BIOS probe*/ 131#define BIOS_LPT_PORTS 0x408 132#define BIOS_PORTS (short *)(KERNBASE+BIOS_LPT_PORTS) 133#define BIOS_MAX_LPT 4 134#endif 135 136 137#ifndef DEBUG 138#define lprintf(args) 139#else 140#define lprintf(args) do { \ 141 if (lptflag) \ 142 printf args; \ 143 } while (0) 144static int volatile lptflag = 1; 145#endif 146 147#define LPTUNIT(s) ((s)&0x03) 148#define LPTFLAGS(s) ((s)&0xfc) 149 150struct lpt_softc { 151 struct resource *res_port; 152 struct resource *res_irq; 153 void *sc_ih; 154 155 int sc_port; 156 short sc_state; 157 /* default case: negative prime, negative ack, handshake strobe, 158 prime once */ 159 u_char sc_control; 160 char sc_flags; 161#define LP_POS_INIT 0x04 /* if we are a postive init signal */ 162#define LP_POS_ACK 0x08 /* if we are a positive going ack */ 163#define LP_NO_PRIME 0x10 /* don't prime the printer at all */ 164#define LP_PRIMEOPEN 0x20 /* prime on every open */ 165#define LP_AUTOLF 0x40 /* tell printer to do an automatic lf */ 166#define LP_BYPASS 0x80 /* bypass printer ready checks */ 167 void *sc_inbuf; 168 short sc_xfercnt ; 169 char sc_primed; 170 char *sc_cp ; 171 u_char sc_irq ; /* IRQ status of port */ 172#define LP_HAS_IRQ 0x01 /* we have an irq available */ 173#define LP_USE_IRQ 0x02 /* we are using our irq */ 174#define LP_ENABLE_IRQ 0x04 /* enable IRQ on open */ 175 u_char sc_backoff ; /* time to call lptout() again */ 176}; 177 178/* bits for state */ 179#define OPEN (1<<0) /* device is open */ 180#define ASLP (1<<1) /* awaiting draining of printer */ 181#define ERROR (1<<2) /* error was received from printer */ 182#define OBUSY (1<<3) /* printer is busy doing output */ 183#define LPTOUT (1<<4) /* timeout while not selected */ 184#define TOUT (1<<5) /* timeout while not selected */ 185#define INIT (1<<6) /* waiting to initialize for open */ 186#define INTERRUPTED (1<<7) /* write call was interrupted */ 187 188 189/* status masks to interrogate printer status */ 190#define RDY_MASK (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR) /* ready ? */ 191#define LP_READY (LPS_SEL|LPS_NBSY|LPS_NERR) 192 193/* Printer Ready condition - from lpa.c */ 194/* Only used in polling code */ 195#ifdef PC98 196#define NOT_READY(x) ((inb(x) & LPS_NBSY) != LPS_NBSY) 197#else /* IBM-PC */ 198#define LPS_INVERT (LPS_NBSY | LPS_NACK | LPS_SEL | LPS_NERR) 199#define LPS_MASK (LPS_NBSY | LPS_NACK | LPS_OUT | LPS_SEL | LPS_NERR) 200#define NOT_READY(x) ((inb(x)^LPS_INVERT)&LPS_MASK) 201#endif 202 203#define MAX_SLEEP (hz*5) /* Timeout while waiting for device ready */ 204#define MAX_SPIN 20 /* Max delay for device ready in usecs */ 205 206static timeout_t lptout; 207static int lpt_probe(device_t); 208static int lpt_attach(device_t); 209static void lpt_intr(void *); 210 211static devclass_t olpt_devclass; 212 213static device_method_t olpt_methods[] = { 214 DEVMETHOD(device_probe, lpt_probe), 215 DEVMETHOD(device_attach, lpt_attach), 216 { 0, 0 } 217}; 218 219static driver_t olpt_driver = { 220 "olpt", 221 olpt_methods, 222 sizeof (struct lpt_softc), 223}; 224 225DRIVER_MODULE(olpt, isa, olpt_driver, olpt_devclass, 0, 0); 226 227static d_open_t lptopen; 228static d_close_t lptclose; 229static d_write_t lptwrite; 230static d_ioctl_t lptioctl; 231 232static struct cdevsw lpt_cdevsw = { 233 .d_open = lptopen, 234 .d_close = lptclose, 235 .d_write = lptwrite, 236 .d_ioctl = lptioctl, 237 .d_name = "lpt", 238}; 239 240static bus_addr_t lpt_iat[] = {0, 2, 4, 6}; 241 242#ifndef PC98 243/* 244 * Internal routine to lptprobe to do port tests of one byte value 245 */ 246static int 247lpt_port_test (int port, u_char data, u_char mask) 248{ 249 int temp, timeout; 250 251 data = data & mask; 252 outb(port, data); 253 timeout = 10000; 254 do { 255 DELAY(10); 256 temp = inb(port) & mask; 257 } 258 while (temp != data && --timeout); 259 lprintf(("Port 0x%x\tout=%x\tin=%x\ttout=%d\n", 260 port, data, temp, timeout)); 261 return (temp == data); 262} 263#endif /* PC98 */ 264 265/* 266 * New lpt port probe Geoff Rehmet - Rhodes University - 14/2/94 267 * Based partially on Rod Grimes' printer probe 268 * 269 * Logic: 270 * 1) If no port address was given, use the bios detected ports 271 * and autodetect what ports the printers are on. 272 * 2) Otherwise, probe the data port at the address given, 273 * using the method in Rod Grimes' port probe. 274 * (Much code ripped off directly from Rod's probe.) 275 * 276 * Comments from Rod's probe: 277 * Logic: 278 * 1) You should be able to write to and read back the same value 279 * to the data port. Do an alternating zeros, alternating ones, 280 * walking zero, and walking one test to check for stuck bits. 281 * 282 * 2) You should be able to write to and read back the same value 283 * to the control port lower 5 bits, the upper 3 bits are reserved 284 * per the IBM PC technical reference manauls and different boards 285 * do different things with them. Do an alternating zeros, alternating 286 * ones, walking zero, and walking one test to check for stuck bits. 287 * 288 * Some printers drag the strobe line down when the are powered off 289 * so this bit has been masked out of the control port test. 290 * 291 * XXX Some printers may not like a fast pulse on init or strobe, I 292 * don't know at this point, if that becomes a problem these bits 293 * should be turned off in the mask byte for the control port test. 294 * 295 * We are finally left with a mask of 0x14, due to some printers 296 * being adamant about holding other bits high ........ 297 * 298 * Before probing the control port, we write a 0 to the data port - 299 * If not, some printers chuck out garbage when the strobe line 300 * gets toggled. 301 * 302 * 3) Set the data and control ports to a value of 0 303 * 304 * This probe routine has been tested on Epson Lx-800, HP LJ3P, 305 * Epson FX-1170 and C.Itoh 8510RM 306 * printers. 307 * Quick exit on fail added. 308 */ 309 310int 311lpt_probe(device_t dev) 312{ 313#ifdef PC98 314#define PC98_OLD_LPT 0x40 315#define PC98_IEEE_1284_FUNCTION 0x149 316 int rid; 317 struct resource *res; 318 319 /* Check isapnp ids */ 320 if (isa_get_vendorid(dev)) 321 return ENXIO; 322 323 rid = 0; 324 res = isa_alloc_resourcev(dev, SYS_RES_IOPORT, &rid, lpt_iat, 4, 325 RF_ACTIVE); 326 if (res == NULL) 327 return ENXIO; 328 isa_load_resourcev(res, lpt_iat, 4); 329 330 if (isa_get_port(dev) == PC98_OLD_LPT) { 331 unsigned int pc98_ieee_mode, tmp; 332 333 tmp = inb(PC98_IEEE_1284_FUNCTION); 334 pc98_ieee_mode = tmp; 335 if ((tmp & 0x10) == 0x10) { 336 outb(PC98_IEEE_1284_FUNCTION, tmp & ~0x10); 337 tmp = inb(PC98_IEEE_1284_FUNCTION); 338 if ((tmp & 0x10) != 0x10) { 339 outb(PC98_IEEE_1284_FUNCTION, pc98_ieee_mode); 340 bus_release_resource(dev, SYS_RES_IOPORT, rid, 341 res); 342 return ENXIO; 343 } 344 } 345 } 346 347 bus_release_resource(dev, SYS_RES_IOPORT, rid, res); 348 return 0; 349#else 350 int port; 351 static short next_bios_lpt = 0; 352 int status; 353 static u_char testbyte[18] = { 354 0x55, /* alternating zeros */ 355 0xaa, /* alternating ones */ 356 0xfe, 0xfd, 0xfb, 0xf7, 357 0xef, 0xdf, 0xbf, 0x7f, /* walking zero */ 358 0x01, 0x02, 0x04, 0x08, 359 0x10, 0x20, 0x40, 0x80 /* walking one */ 360 }; 361 int i; 362 363 /* 364 * Make sure there is some way for lptopen to see that 365 * the port is not configured 366 * This 0 will remain if the port isn't attached 367 */ 368 (lpt_sc + dvp->id_unit)->sc_port = 0; 369 370 status = IO_LPTSIZE; 371 /* If port not specified, use bios list */ 372 if(dvp->id_iobase < 0) { /* port? */ 373 if((next_bios_lpt < BIOS_MAX_LPT) && 374 (*(BIOS_PORTS+next_bios_lpt) != 0) ) { 375 dvp->id_iobase = *(BIOS_PORTS+next_bios_lpt++); 376 goto end_probe; 377 } else 378 return (0); 379 } 380 381 /* Port was explicitly specified */ 382 /* This allows probing of ports unknown to the BIOS */ 383 port = dvp->id_iobase + lpt_data; 384 for (i = 0; i < 18; i++) { 385 if (!lpt_port_test(port, testbyte[i], 0xff)) { 386 status = 0; 387 goto end_probe; 388 } 389 } 390 391end_probe: 392 /* write 0's to control and data ports */ 393 outb(dvp->id_iobase+lpt_data, 0); 394 outb(dvp->id_iobase+lpt_control, 0); 395 396 return (status); 397#endif 398} 399 400/* XXX Todo - try and detect if interrupt is working */ 401int 402lpt_attach(device_t dev) 403{ 404 int rid, unit; 405 struct lpt_softc *sc; 406 407 unit = device_get_unit(dev); 408 sc = device_get_softc(dev); 409 410 rid = 0; 411 sc->res_port = isa_alloc_resourcev(dev, SYS_RES_IOPORT, &rid, 412 lpt_iat, 4, RF_ACTIVE); 413 if (sc->res_port == NULL) 414 return ENXIO; 415 isa_load_resourcev(sc->res_port, lpt_iat, 4); 416 417 sc->sc_port = rman_get_start(sc->res_port); 418 sc->sc_primed = 0; /* not primed yet */ 419#ifdef PC98 420 outb(sc->sc_port+lpt_pstb_ctrl, LPC_DIS_PSTB); /* PSTB disable */ 421 outb(sc->sc_port+lpt_control, LPC_MODE8255); /* 8255 mode set */ 422 outb(sc->sc_port+lpt_control, LPC_NIRQ8); /* IRQ8 inactive */ 423 outb(sc->sc_port+lpt_control, LPC_NPSTB); /* PSTB inactive */ 424 outb(sc->sc_port+lpt_pstb_ctrl, LPC_EN_PSTB); /* PSTB enable */ 425#else 426 outb(sc->sc_port+lpt_control, LPC_NINIT); 427#endif 428 429 sc->sc_irq = 0; 430 if (isa_get_irq(dev) != -1) { 431 rid = 0; 432 sc->res_irq = bus_alloc_resource(dev, SYS_RES_IRQ, &rid, 433 0, ~0, 1, RF_ACTIVE); 434 if (sc->res_irq == NULL) { 435 bus_release_resource(dev, SYS_RES_IOPORT, 0, 436 sc->res_port); 437 return ENXIO; 438 } 439 if (bus_setup_intr(dev, sc->res_irq, INTR_TYPE_TTY, lpt_intr, 440 sc, &sc->sc_ih)) { 441 bus_release_resource(dev, SYS_RES_IOPORT, 0, 442 sc->res_port); 443 bus_release_resource(dev, SYS_RES_IRQ, 0, 444 sc->res_irq); 445 return ENXIO; 446 } 447 sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ; 448 device_printf(dev, "Interrupt-driven port"); 449 } 450 451 /* XXX what to do about the flags in the minor number? */ 452 make_dev(&lpt_cdevsw, unit, UID_ROOT, GID_WHEEL, 0600, "lpt%d", unit); 453 make_dev(&lpt_cdevsw, unit | LP_BYPASS, 454 UID_ROOT, GID_WHEEL, 0600, "lpctl%d", unit); 455 456 return 0; 457} 458 459/* 460 * lptopen -- reset the printer, then wait until it's selected and not busy. 461 * If LP_BYPASS flag is selected, then we do not try to select the 462 * printer -- this is just used for passing ioctls. 463 */ 464 465static int 466lptopen (dev_t dev, int flags, int fmt, struct thread *td) 467{ 468 struct lpt_softc *sc; 469 int s; 470#ifdef PC98 471 int port; 472#else 473 int trys, port; 474#endif 475 476 sc = devclass_get_softc(olpt_devclass, LPTUNIT(minor(dev))); 477 if (sc->sc_port == 0) 478 return (ENXIO); 479 480 if (sc->sc_state) { 481 lprintf(("lp: still open %x\n", sc->sc_state)); 482 return(EBUSY); 483 } else 484 sc->sc_state |= INIT; 485 486 sc->sc_flags = LPTFLAGS(minor(dev)); 487 488 /* Check for open with BYPASS flag set. */ 489 if (sc->sc_flags & LP_BYPASS) { 490 sc->sc_state = OPEN; 491 return(0); 492 } 493 494 s = spltty(); 495 lprintf(("lp flags 0x%x\n", sc->sc_flags)); 496 port = sc->sc_port; 497 498 /* set IRQ status according to ENABLE_IRQ flag */ 499 if (sc->sc_irq & LP_ENABLE_IRQ) 500 sc->sc_irq |= LP_USE_IRQ; 501 else 502 sc->sc_irq &= ~LP_USE_IRQ; 503 504 /* init printer */ 505#ifndef PC98 506 if ((sc->sc_flags & LP_NO_PRIME) == 0) { 507 if((sc->sc_flags & LP_PRIMEOPEN) || sc->sc_primed == 0) { 508 outb(port+lpt_control, 0); 509 sc->sc_primed++; 510 DELAY(500); 511 } 512 } 513 514 outb (port+lpt_control, 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", inb(port+lpt_status))); 524 return (EBUSY); 525 } 526 527 /* wait 1/4 second, give up if we get a signal */ 528 if (tsleep (sc, LPPRI|PCATCH, "lptinit", hz/4) != 529 EWOULDBLOCK) { 530 sc->sc_state = 0; 531 splx(s); 532 return (EBUSY); 533 } 534 535 /* is printer online and ready for output */ 536 } while ((inb(port+lpt_status) & (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 537 (LPS_SEL|LPS_NBSY|LPS_NERR)); 538 539 sc->sc_control = LPC_SEL|LPC_NINIT; 540 if (sc->sc_flags & LP_AUTOLF) 541 sc->sc_control |= LPC_AUTOL; 542 543 /* enable interrupt if interrupt-driven */ 544 if (sc->sc_irq & LP_USE_IRQ) 545 sc->sc_control |= LPC_ENA; 546 547 outb(port+lpt_control, sc->sc_control); 548#endif 549 550 sc->sc_state = OPEN; 551 sc->sc_inbuf = malloc(BUFSIZE, M_DEVBUF, M_WAITOK); 552 sc->sc_xfercnt = 0; 553 splx(s); 554 555 /* only use timeout if using interrupt */ 556 lprintf(("irq %x\n", sc->sc_irq)); 557 if (sc->sc_irq & LP_USE_IRQ) { 558 sc->sc_state |= TOUT; 559 timeout (lptout, (caddr_t)sc, 560 (sc->sc_backoff = hz/LPTOUTINITIAL)); 561 } 562 563 lprintf(("opened.\n")); 564 return(0); 565} 566 567static void 568lptout (void *arg) 569{ 570 struct lpt_softc *sc = arg; 571 int pl; 572 573 lprintf(("T %x ", inb(sc->sc_port+lpt_status))); 574 if (sc->sc_state & OPEN) { 575 sc->sc_backoff++; 576 if (sc->sc_backoff > hz/LPTOUTMAX) 577 sc->sc_backoff = sc->sc_backoff > hz/LPTOUTMAX; 578 timeout (lptout, (caddr_t)sc, sc->sc_backoff); 579 } else 580 sc->sc_state &= ~TOUT; 581 582 if (sc->sc_state & ERROR) 583 sc->sc_state &= ~ERROR; 584 585 /* 586 * Avoid possible hangs do to missed interrupts 587 */ 588 if (sc->sc_xfercnt) { 589 pl = spltty(); 590 lpt_intr(sc); 591 splx(pl); 592 } else { 593 sc->sc_state &= ~OBUSY; 594 wakeup(sc); 595 } 596} 597 598/* 599 * lptclose -- close the device, free the local line buffer. 600 * 601 * Check for interrupted write call added. 602 */ 603 604static int 605lptclose(dev_t dev, int flags, int fmt, struct thread *td) 606{ 607 struct lpt_softc *sc; 608#ifndef PC98 609 int port; 610#endif 611 612 sc = devclass_get_softc(olpt_devclass, LPTUNIT(minor(dev))); 613 if(sc->sc_flags & LP_BYPASS) 614 goto end_close; 615 616#ifndef PC98 617 port = sc->sc_port; 618#endif 619 sc->sc_state &= ~OPEN; 620 621#ifndef PC98 622 /* if the last write was interrupted, don't complete it */ 623 if((!(sc->sc_state & INTERRUPTED)) && (sc->sc_irq & LP_USE_IRQ)) 624 while ((inb(port+lpt_status) & (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 625 (LPS_SEL|LPS_NBSY|LPS_NERR) || sc->sc_xfercnt) 626 /* wait 1/4 second, give up if we get a signal */ 627 if (tsleep (sc, LPPRI|PCATCH, 628 "lpclose", hz) != EWOULDBLOCK) 629 break; 630 631 outb(sc->sc_port+lpt_control, LPC_NINIT); 632#endif 633 free(sc->sc_inbuf, M_DEVBUF); 634 635end_close: 636 sc->sc_state = 0; 637 sc->sc_xfercnt = 0; 638 lprintf(("closed.\n")); 639 return(0); 640} 641 642/* 643 * pushbytes() 644 * Workhorse for actually spinning and writing bytes to printer 645 * Derived from lpa.c 646 * Originally by ? 647 * 648 * This code is only used when we are polling the port 649 */ 650static int 651pushbytes(struct lpt_softc * sc) 652{ 653 int spin, err, tic; 654 char ch; 655 int port = sc->sc_port; 656 657 lprintf(("p")); 658 /* loop for every character .. */ 659 while (sc->sc_xfercnt > 0) { 660 /* printer data */ 661 ch = *(sc->sc_cp); 662 sc->sc_cp++; 663 sc->sc_xfercnt--; 664 665 /* 666 * Wait for printer ready. 667 * Loop 20 usecs testing BUSY bit, then sleep 668 * for exponentially increasing timeout. (vak) 669 */ 670 for (spin=0; NOT_READY(port+lpt_status) && spin<MAX_SPIN; ++spin) 671 DELAY(1); /* XXX delay is NOT this accurate! */ 672 if (spin >= MAX_SPIN) { 673 tic = 0; 674 while (NOT_READY(port+lpt_status)) { 675 /* 676 * Now sleep, every cycle a 677 * little longer .. 678 */ 679 tic = tic + tic + 1; 680 /* 681 * But no more than 10 seconds. (vak) 682 */ 683 if (tic > MAX_SLEEP) 684 tic = MAX_SLEEP; 685 err = tsleep(sc, LPPRI, 686 "lptpoll", tic); 687 if (err != EWOULDBLOCK) { 688 return (err); 689 } 690 } 691 } 692 693 /* output data */ 694 outb(port+lpt_data, ch); 695#ifdef PC98 696 DELAY(1); 697 outb(port+lpt_control, LPC_PSTB); 698 DELAY(1); 699 outb(port+lpt_control, LPC_NPSTB); 700#else 701 /* strobe */ 702 outb(port+lpt_control, sc->sc_control|LPC_STB); 703 outb(port+lpt_control, sc->sc_control); 704#endif 705 706 } 707 return(0); 708} 709 710/* 711 * lptwrite --copy a line from user space to a local buffer, then call 712 * putc to get the chars moved to the output queue. 713 * 714 * Flagging of interrupted write added. 715 */ 716 717static int 718lptwrite(dev_t dev, struct uio * uio, int ioflag) 719{ 720 register unsigned n; 721 int pl, err; 722 struct lpt_softc *sc; 723 724 sc = devclass_get_softc(olpt_devclass, LPTUNIT(minor(dev))); 725 if(sc->sc_flags & LP_BYPASS) { 726 /* we can't do writes in bypass mode */ 727 return(EPERM); 728 } 729 730 sc->sc_state &= ~INTERRUPTED; 731 while ((n = min(BUFSIZE, uio->uio_resid)) != 0) { 732 sc->sc_cp = sc->sc_inbuf; 733 uiomove(sc->sc_cp, n, uio); 734 sc->sc_xfercnt = n ; 735 while ((sc->sc_xfercnt > 0)&&(sc->sc_irq & LP_USE_IRQ)) { 736 lprintf(("i")); 737 /* if the printer is ready for a char, */ 738 /* give it one */ 739 if ((sc->sc_state & OBUSY) == 0){ 740 lprintf(("\nC %d. ", sc->sc_xfercnt)); 741 pl = spltty(); 742 lpt_intr(sc); 743 (void) splx(pl); 744 } 745 lprintf(("W ")); 746 if (sc->sc_state & OBUSY) 747 if ((err = tsleep (sc, 748 LPPRI|PCATCH, "lpwrite", 0))) { 749 sc->sc_state |= INTERRUPTED; 750 return(err); 751 } 752 } 753 /* check to see if we must do a polled write */ 754 if(!(sc->sc_irq & LP_USE_IRQ) && (sc->sc_xfercnt)) { 755 lprintf(("p")); 756 if((err = pushbytes(sc))) 757 return(err); 758 } 759 } 760 return(0); 761} 762 763/* 764 * lptintr -- handle printer interrupts which occur when the printer is 765 * ready to accept another char. 766 * 767 * do checking for interrupted write call. 768 */ 769 770static void 771lpt_intr(void *arg) 772{ 773} 774 775static int 776lptioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct thread *td) 777{ 778 int error = 0; 779 struct lpt_softc *sc; 780 u_int unit = LPTUNIT(minor(dev)); 781 u_char old_sc_irq; /* old printer IRQ status */ 782 783 sc = devclass_get_softc(olpt_devclass, unit); 784 785 switch (cmd) { 786 case LPT_IRQ : 787 if(sc->sc_irq & LP_HAS_IRQ) { 788 /* 789 * NOTE: 790 * If the IRQ status is changed, 791 * this will only be visible on the 792 * next open. 793 * 794 * If interrupt status changes, 795 * this gets syslog'd. 796 */ 797 old_sc_irq = sc->sc_irq; 798 if(*(int*)data == 0) 799 sc->sc_irq &= (~LP_ENABLE_IRQ); 800 else 801 sc->sc_irq |= LP_ENABLE_IRQ; 802 if (old_sc_irq != sc->sc_irq ) 803 log(LOG_NOTICE, "lpt%c switched to %s mode\n", 804 (char)unit+'0', 805 (sc->sc_irq & LP_ENABLE_IRQ)? 806 "interrupt-driven":"polled"); 807 } else /* polled port */ 808 error = EOPNOTSUPP; 809 break; 810 default: 811 error = ENODEV; 812 } 813 814 return(error); 815} 816