Annotation of sys/dev/ic/lpt.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: lpt.c,v 1.5 2002/03/14 01:26:54 millert Exp $ */
! 2: /* $NetBSD: lpt.c,v 1.42 1996/10/21 22:41:14 thorpej Exp $ */
! 3:
! 4: /*
! 5: * Copyright (c) 1993, 1994 Charles Hannum.
! 6: * Copyright (c) 1990 William F. Jolitz, TeleMuse
! 7: * All rights reserved.
! 8: *
! 9: * Redistribution and use in source and binary forms, with or without
! 10: * modification, are permitted provided that the following conditions
! 11: * are met:
! 12: * 1. Redistributions of source code must retain the above copyright
! 13: * notice, this list of conditions and the following disclaimer.
! 14: * 2. Redistributions in binary form must reproduce the above copyright
! 15: * notice, this list of conditions and the following disclaimer in the
! 16: * documentation and/or other materials provided with the distribution.
! 17: * 3. All advertising materials mentioning features or use of this software
! 18: * must display the following acknowledgement:
! 19: * This software is a component of "386BSD" developed by
! 20: * William F. Jolitz, TeleMuse.
! 21: * 4. Neither the name of the developer nor the name "386BSD"
! 22: * may be used to endorse or promote products derived from this software
! 23: * without specific prior written permission.
! 24: *
! 25: * THIS SOFTWARE IS A COMPONENT OF 386BSD DEVELOPED BY WILLIAM F. JOLITZ
! 26: * AND IS INTENDED FOR RESEARCH AND EDUCATIONAL PURPOSES ONLY. THIS
! 27: * SOFTWARE SHOULD NOT BE CONSIDERED TO BE A COMMERCIAL PRODUCT.
! 28: * THE DEVELOPER URGES THAT USERS WHO REQUIRE A COMMERCIAL PRODUCT
! 29: * NOT MAKE USE OF THIS WORK.
! 30: *
! 31: * FOR USERS WHO WISH TO UNDERSTAND THE 386BSD SYSTEM DEVELOPED
! 32: * BY WILLIAM F. JOLITZ, WE RECOMMEND THE USER STUDY WRITTEN
! 33: * REFERENCES SUCH AS THE "PORTING UNIX TO THE 386" SERIES
! 34: * (BEGINNING JANUARY 1991 "DR. DOBBS JOURNAL", USA AND BEGINNING
! 35: * JUNE 1991 "UNIX MAGAZIN", GERMANY) BY WILLIAM F. JOLITZ AND
! 36: * LYNNE GREER JOLITZ, AS WELL AS OTHER BOOKS ON UNIX AND THE
! 37: * ON-LINE 386BSD USER MANUAL BEFORE USE. A BOOK DISCUSSING THE INTERNALS
! 38: * OF 386BSD ENTITLED "386BSD FROM THE INSIDE OUT" WILL BE AVAILABLE LATE 1992.
! 39: *
! 40: * THIS SOFTWARE IS PROVIDED BY THE DEVELOPER ``AS IS'' AND
! 41: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 42: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 43: * ARE DISCLAIMED. IN NO EVENT SHALL THE DEVELOPER BE LIABLE
! 44: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 45: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 46: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 47: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 48: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 49: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 50: * SUCH DAMAGE.
! 51: */
! 52:
! 53: /*
! 54: * Device Driver for AT parallel printer port
! 55: */
! 56:
! 57: #include <sys/param.h>
! 58: #include <sys/systm.h>
! 59: #include <sys/proc.h>
! 60: #include <sys/user.h>
! 61: #include <sys/buf.h>
! 62: #include <sys/kernel.h>
! 63: #include <sys/ioctl.h>
! 64: #include <sys/uio.h>
! 65: #include <sys/device.h>
! 66: #include <sys/conf.h>
! 67: #include <sys/syslog.h>
! 68:
! 69: #include <machine/bus.h>
! 70: #include <machine/intr.h>
! 71:
! 72: #include <dev/ic/lptreg.h>
! 73: #include <dev/ic/lptvar.h>
! 74:
! 75: #include "lpt.h"
! 76:
! 77: #define TIMEOUT hz*16 /* wait up to 16 seconds for a ready */
! 78: #define STEP hz/4
! 79:
! 80: #define LPTPRI (PZERO+8)
! 81: #define LPT_BSIZE 1024
! 82:
! 83: #if !defined(DEBUG) || !defined(notdef)
! 84: #define LPRINTF(a)
! 85: #else
! 86: #define LPRINTF(a) if (lptdebug) printf a
! 87: int lptdebug = 1;
! 88: #endif
! 89:
! 90: /* XXX does not belong here */
! 91: cdev_decl(lpt);
! 92:
! 93: struct cfdriver lpt_cd = {
! 94: NULL, "lpt", DV_TTY
! 95: };
! 96:
! 97: #define LPTUNIT(s) (minor(s) & 0x1f)
! 98: #define LPTFLAGS(s) (minor(s) & 0xe0)
! 99:
! 100: #define LPS_INVERT (LPS_SELECT|LPS_NERR|LPS_NBSY|LPS_NACK)
! 101: #define LPS_MASK (LPS_SELECT|LPS_NERR|LPS_NBSY|LPS_NACK|LPS_NOPAPER)
! 102: #define NOT_READY() \
! 103: ((bus_space_read_1(iot, ioh, lpt_status) ^ LPS_INVERT) & LPS_MASK)
! 104: #define NOT_READY_ERR() \
! 105: lpt_not_ready(bus_space_read_1(iot, ioh, lpt_status), sc)
! 106:
! 107: int lpt_not_ready(u_int8_t, struct lpt_softc *);
! 108: void lptwakeup(void *arg);
! 109: int lptpushbytes(struct lpt_softc *);
! 110:
! 111: /*
! 112: * Internal routine to lptprobe to do port tests of one byte value.
! 113: */
! 114: int
! 115: lpt_port_test(iot, ioh, base, off, data, mask)
! 116: bus_space_tag_t iot;
! 117: bus_space_handle_t ioh;
! 118: bus_addr_t base;
! 119: bus_size_t off;
! 120: u_int8_t data, mask;
! 121: {
! 122: int timeout;
! 123: u_int8_t temp;
! 124:
! 125: data &= mask;
! 126: bus_space_write_1(iot, ioh, off, data);
! 127: timeout = 1000;
! 128: do {
! 129: delay(10);
! 130: temp = bus_space_read_1(iot, ioh, off) & mask;
! 131: } while (temp != data && --timeout);
! 132: LPRINTF(("lpt: port=0x%x out=0x%x in=0x%x timeout=%d\n", base + off,
! 133: data, temp, timeout));
! 134: return (temp == data);
! 135: }
! 136:
! 137: void
! 138: lpt_attach_common(sc)
! 139: struct lpt_softc *sc;
! 140: {
! 141: printf("\n");
! 142:
! 143: bus_space_write_1(sc->sc_iot, sc->sc_ioh, lpt_control, LPC_NINIT);
! 144:
! 145: timeout_set(&sc->sc_wakeup_tmo, lptwakeup, sc);
! 146: }
! 147:
! 148: /*
! 149: * Reset the printer, then wait until it's selected and not busy.
! 150: */
! 151: int
! 152: lptopen(dev, flag, mode, p)
! 153: dev_t dev;
! 154: int flag;
! 155: int mode;
! 156: struct proc *p;
! 157: {
! 158: int unit = LPTUNIT(dev);
! 159: u_int8_t flags = LPTFLAGS(dev);
! 160: struct lpt_softc *sc;
! 161: bus_space_tag_t iot;
! 162: bus_space_handle_t ioh;
! 163: u_int8_t control;
! 164: int error;
! 165: int spin;
! 166:
! 167: if (unit >= lpt_cd.cd_ndevs)
! 168: return ENXIO;
! 169: sc = lpt_cd.cd_devs[unit];
! 170: if (!sc)
! 171: return ENXIO;
! 172:
! 173: sc->sc_flags = (sc->sc_flags & LPT_POLLED) | flags;
! 174: if ((sc->sc_flags & (LPT_POLLED|LPT_NOINTR)) == LPT_POLLED)
! 175: return ENXIO;
! 176:
! 177: #ifdef DIAGNOSTIC
! 178: if (sc->sc_state)
! 179: printf("%s: stat=0x%x not zero\n", sc->sc_dev.dv_xname,
! 180: sc->sc_state);
! 181: #endif
! 182:
! 183: if (sc->sc_state)
! 184: return EBUSY;
! 185:
! 186: sc->sc_state = LPT_INIT;
! 187: LPRINTF(("%s: open: flags=0x%x\n", sc->sc_dev.dv_xname, flags));
! 188: iot = sc->sc_iot;
! 189: ioh = sc->sc_ioh;
! 190:
! 191: if ((flags & LPT_NOPRIME) == 0) {
! 192: /* assert INIT for 100 usec to start up printer */
! 193: bus_space_write_1(iot, ioh, lpt_control, LPC_SELECT);
! 194: delay(100);
! 195: }
! 196:
! 197: control = LPC_SELECT | LPC_NINIT;
! 198: bus_space_write_1(iot, ioh, lpt_control, control);
! 199:
! 200: /* wait till ready (printer running diagnostics) */
! 201: for (spin = 0; NOT_READY_ERR(); spin += STEP) {
! 202: if (spin >= TIMEOUT) {
! 203: sc->sc_state = 0;
! 204: return EBUSY;
! 205: }
! 206:
! 207: /* wait 1/4 second, give up if we get a signal */
! 208: error = tsleep((caddr_t)sc, LPTPRI | PCATCH, "lptopen", STEP);
! 209: if (error != EWOULDBLOCK) {
! 210: sc->sc_state = 0;
! 211: return error;
! 212: }
! 213: }
! 214:
! 215: if ((flags & LPT_NOINTR) == 0)
! 216: control |= LPC_IENABLE;
! 217: if (flags & LPT_AUTOLF)
! 218: control |= LPC_AUTOLF;
! 219: sc->sc_control = control;
! 220: bus_space_write_1(iot, ioh, lpt_control, control);
! 221:
! 222: sc->sc_inbuf = geteblk(LPT_BSIZE);
! 223: sc->sc_count = 0;
! 224: sc->sc_state = LPT_OPEN;
! 225:
! 226: if ((sc->sc_flags & LPT_NOINTR) == 0)
! 227: lptwakeup(sc);
! 228:
! 229: LPRINTF(("%s: opened\n", sc->sc_dev.dv_xname));
! 230: return 0;
! 231: }
! 232:
! 233: int
! 234: lpt_not_ready(status, sc)
! 235: u_int8_t status;
! 236: struct lpt_softc *sc;
! 237: {
! 238: u_int8_t new;
! 239:
! 240: status = (status ^ LPS_INVERT) & LPS_MASK;
! 241: new = status & ~sc->sc_laststatus;
! 242: sc->sc_laststatus = status;
! 243:
! 244: if (new & LPS_SELECT)
! 245: log(LOG_NOTICE, "%s: offline\n", sc->sc_dev.dv_xname);
! 246: else if (new & LPS_NOPAPER)
! 247: log(LOG_NOTICE, "%s: out of paper\n", sc->sc_dev.dv_xname);
! 248: else if (new & LPS_NERR)
! 249: log(LOG_NOTICE, "%s: output error\n", sc->sc_dev.dv_xname);
! 250:
! 251: return status;
! 252: }
! 253:
! 254: void
! 255: lptwakeup(arg)
! 256: void *arg;
! 257: {
! 258: struct lpt_softc *sc = arg;
! 259: int s;
! 260:
! 261: s = spltty();
! 262: lptintr(sc);
! 263: splx(s);
! 264:
! 265: timeout_add(&sc->sc_wakeup_tmo, STEP);
! 266: }
! 267:
! 268: /*
! 269: * Close the device, and free the local line buffer.
! 270: */
! 271: int
! 272: lptclose(dev, flag, mode, p)
! 273: dev_t dev;
! 274: int flag;
! 275: int mode;
! 276: struct proc *p;
! 277: {
! 278: int unit = LPTUNIT(dev);
! 279: struct lpt_softc *sc = lpt_cd.cd_devs[unit];
! 280: bus_space_tag_t iot = sc->sc_iot;
! 281: bus_space_handle_t ioh = sc->sc_ioh;
! 282:
! 283: if (sc->sc_count)
! 284: (void) lptpushbytes(sc);
! 285:
! 286: if ((sc->sc_flags & LPT_NOINTR) == 0)
! 287: timeout_del(&sc->sc_wakeup_tmo);
! 288:
! 289: bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT);
! 290: sc->sc_state = 0;
! 291: bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT);
! 292: brelse(sc->sc_inbuf);
! 293:
! 294: LPRINTF(("%s: closed\n", sc->sc_dev.dv_xname));
! 295: return 0;
! 296: }
! 297:
! 298: int
! 299: lptpushbytes(sc)
! 300: struct lpt_softc *sc;
! 301: {
! 302: bus_space_tag_t iot = sc->sc_iot;
! 303: bus_space_handle_t ioh = sc->sc_ioh;
! 304: int error;
! 305:
! 306: if (sc->sc_flags & LPT_NOINTR) {
! 307: int spin, tic;
! 308: u_int8_t control = sc->sc_control;
! 309:
! 310: while (sc->sc_count > 0) {
! 311: spin = 0;
! 312: while (NOT_READY()) {
! 313: if (++spin < sc->sc_spinmax)
! 314: continue;
! 315: tic = 0;
! 316: /* adapt busy-wait algorithm */
! 317: sc->sc_spinmax++;
! 318: while (NOT_READY_ERR()) {
! 319: /* exponential backoff */
! 320: tic = tic + tic + 1;
! 321: if (tic > TIMEOUT)
! 322: tic = TIMEOUT;
! 323: error = tsleep((caddr_t)sc,
! 324: LPTPRI | PCATCH, "lptpsh", tic);
! 325: if (error != EWOULDBLOCK)
! 326: return error;
! 327: }
! 328: break;
! 329: }
! 330:
! 331: bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++);
! 332: bus_space_write_1(iot, ioh, lpt_control,
! 333: control | LPC_STROBE);
! 334: sc->sc_count--;
! 335: bus_space_write_1(iot, ioh, lpt_control, control);
! 336:
! 337: /* adapt busy-wait algorithm */
! 338: if (spin*2 + 16 < sc->sc_spinmax)
! 339: sc->sc_spinmax--;
! 340: }
! 341: } else {
! 342: int s;
! 343:
! 344: while (sc->sc_count > 0) {
! 345: /* if the printer is ready for a char, give it one */
! 346: if ((sc->sc_state & LPT_OBUSY) == 0) {
! 347: LPRINTF(("%s: write %d\n", sc->sc_dev.dv_xname,
! 348: sc->sc_count));
! 349: s = spltty();
! 350: (void) lptintr(sc);
! 351: splx(s);
! 352: }
! 353: error = tsleep((caddr_t)sc, LPTPRI | PCATCH,
! 354: "lptwrite2", 0);
! 355: if (error)
! 356: return error;
! 357: }
! 358: }
! 359: return 0;
! 360: }
! 361:
! 362: /*
! 363: * Copy a line from user space to a local buffer, then call putc to get the
! 364: * chars moved to the output queue.
! 365: */
! 366: int
! 367: lptwrite(dev, uio, flags)
! 368: dev_t dev;
! 369: struct uio *uio;
! 370: int flags;
! 371: {
! 372: struct lpt_softc *sc = lpt_cd.cd_devs[LPTUNIT(dev)];
! 373: size_t n;
! 374: int error = 0;
! 375:
! 376: while ((n = min(LPT_BSIZE, uio->uio_resid)) != 0) {
! 377: uiomove(sc->sc_cp = sc->sc_inbuf->b_data, n, uio);
! 378: sc->sc_count = n;
! 379: error = lptpushbytes(sc);
! 380: if (error) {
! 381: /*
! 382: * Return accurate residual if interrupted or timed
! 383: * out.
! 384: */
! 385: uio->uio_resid += sc->sc_count;
! 386: sc->sc_count = 0;
! 387: return error;
! 388: }
! 389: }
! 390: return 0;
! 391: }
! 392:
! 393: /*
! 394: * Handle printer interrupts which occur when the printer is ready to accept
! 395: * another char.
! 396: */
! 397: int
! 398: lptintr(arg)
! 399: void *arg;
! 400: {
! 401: struct lpt_softc *sc = arg;
! 402: bus_space_tag_t iot = sc->sc_iot;
! 403: bus_space_handle_t ioh = sc->sc_ioh;
! 404:
! 405: if (((sc->sc_state & LPT_OPEN) == 0 && sc->sc_count == 0) ||
! 406: (sc->sc_flags & LPT_NOINTR))
! 407: return 0;
! 408:
! 409: /* is printer online and ready for output */
! 410: if (NOT_READY() && NOT_READY_ERR())
! 411: return -1;
! 412:
! 413: if (sc->sc_count) {
! 414: u_int8_t control = sc->sc_control;
! 415: /* send char */
! 416: bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++);
! 417: delay (50);
! 418: bus_space_write_1(iot, ioh, lpt_control, control | LPC_STROBE);
! 419: sc->sc_count--;
! 420: bus_space_write_1(iot, ioh, lpt_control, control);
! 421: sc->sc_state |= LPT_OBUSY;
! 422: } else
! 423: sc->sc_state &= ~LPT_OBUSY;
! 424:
! 425: if (sc->sc_count == 0) {
! 426: /* none, wake up the top half to get more */
! 427: wakeup((caddr_t)sc);
! 428: }
! 429:
! 430: return 1;
! 431: }
! 432:
! 433: int
! 434: lptioctl(dev, cmd, data, flag, p)
! 435: dev_t dev;
! 436: u_long cmd;
! 437: caddr_t data;
! 438: int flag;
! 439: struct proc *p;
! 440: {
! 441: int error = 0;
! 442:
! 443: switch (cmd) {
! 444: default:
! 445: error = ENODEV;
! 446: }
! 447:
! 448: return error;
! 449: }
CVSweb
![[BACK]](/icons/back.gif){kind=icon}
Return to lpt.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / sys / dev / ic