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Diffstat (limited to 'sys/dev/ic/lpt.c')
| -rw-r--r-- | sys/dev/ic/lpt.c | 438 |
1 files changed, 438 insertions, 0 deletions
diff --git a/sys/dev/ic/lpt.c b/sys/dev/ic/lpt.c new file mode 100644 index 00000000000..9dc974779f1 --- /dev/null +++ b/sys/dev/ic/lpt.c @@ -0,0 +1,438 @@ +/* $OpenBSD: lpt.c,v 1.1 1996/11/30 00:53:35 niklas Exp $ */ +/* $NetBSD: lpt.c,v 1.42 1996/10/21 22:41:14 thorpej Exp $ */ + +/* + * Copyright (c) 1993, 1994 Charles Hannum. + * Copyright (c) 1990 William F. Jolitz, TeleMuse + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This software is a component of "386BSD" developed by + * William F. Jolitz, TeleMuse. + * 4. Neither the name of the developer nor the name "386BSD" + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS A COMPONENT OF 386BSD DEVELOPED BY WILLIAM F. JOLITZ + * AND IS INTENDED FOR RESEARCH AND EDUCATIONAL PURPOSES ONLY. THIS + * SOFTWARE SHOULD NOT BE CONSIDERED TO BE A COMMERCIAL PRODUCT. + * THE DEVELOPER URGES THAT USERS WHO REQUIRE A COMMERCIAL PRODUCT + * NOT MAKE USE OF THIS WORK. + * + * FOR USERS WHO WISH TO UNDERSTAND THE 386BSD SYSTEM DEVELOPED + * BY WILLIAM F. JOLITZ, WE RECOMMEND THE USER STUDY WRITTEN + * REFERENCES SUCH AS THE "PORTING UNIX TO THE 386" SERIES + * (BEGINNING JANUARY 1991 "DR. DOBBS JOURNAL", USA AND BEGINNING + * JUNE 1991 "UNIX MAGAZIN", GERMANY) BY WILLIAM F. JOLITZ AND + * LYNNE GREER JOLITZ, AS WELL AS OTHER BOOKS ON UNIX AND THE + * ON-LINE 386BSD USER MANUAL BEFORE USE. A BOOK DISCUSSING THE INTERNALS + * OF 386BSD ENTITLED "386BSD FROM THE INSIDE OUT" WILL BE AVAILABLE LATE 1992. + * + * THIS SOFTWARE IS PROVIDED BY THE DEVELOPER ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE DEVELOPER BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +/* + * Device Driver for AT parallel printer port + */ + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/proc.h> +#include <sys/user.h> +#include <sys/buf.h> +#include <sys/kernel.h> +#include <sys/ioctl.h> +#include <sys/uio.h> +#include <sys/device.h> +#include <sys/conf.h> +#include <sys/syslog.h> + +#include <machine/bus.h> +#include <machine/intr.h> + +#include <dev/ic/lptreg.h> +#include <dev/ic/lptvar.h> + +#include "lpt.h" + +#define TIMEOUT hz*16 /* wait up to 16 seconds for a ready */ +#define STEP hz/4 + +#define LPTPRI (PZERO+8) +#define LPT_BSIZE 1024 + +#if !defined(DEBUG) || !defined(notdef) +#define LPRINTF(a) +#else +#define LPRINTF if (lptdebug) printf a +int lptdebug = 1; +#endif + +/* XXX does not belong here */ +cdev_decl(lpt); + +struct cfdriver lpt_cd = { + NULL, "lpt", DV_TTY +}; + +#define LPTUNIT(s) (minor(s) & 0x1f) +#define LPTFLAGS(s) (minor(s) & 0xe0) + +#define LPS_INVERT (LPS_SELECT|LPS_NERR|LPS_NBSY|LPS_NACK) +#define LPS_MASK (LPS_SELECT|LPS_NERR|LPS_NBSY|LPS_NACK|LPS_NOPAPER) +#define NOT_READY() \ + ((bus_space_read_1(iot, ioh, lpt_status) ^ LPS_INVERT) & LPS_MASK) +#define NOT_READY_ERR() \ + lpt_not_ready(bus_space_read_1(iot, ioh, lpt_status), sc) + +int lpt_not_ready __P((u_int8_t, struct lpt_softc *)); +void lptwakeup __P((void *arg)); +int lptpushbytes __P((struct lpt_softc *)); + +/* + * Internal routine to lptprobe to do port tests of one byte value. + */ +int +lpt_port_test(iot, ioh, base, off, data, mask) + bus_space_tag_t iot; + bus_space_handle_t ioh; + bus_addr_t base; + bus_size_t off; + u_int8_t data, mask; +{ + int timeout; + u_int8_t temp; + + data &= mask; + bus_space_write_1(iot, ioh, off, data); + timeout = 1000; + do { + delay(10); + temp = bus_space_read_1(iot, ioh, off) & mask; + } while (temp != data && --timeout); + LPRINTF(("lpt: port=0x%x out=0x%x in=0x%x timeout=%d\n", base + off, + data, temp, timeout)); + return (temp == data); +} + +/* + * Reset the printer, then wait until it's selected and not busy. + */ +int +lptopen(dev, flag, mode, p) + dev_t dev; + int flag; + int mode; + struct proc *p; +{ + int unit = LPTUNIT(dev); + u_int8_t flags = LPTFLAGS(dev); + struct lpt_softc *sc; + bus_space_tag_t iot; + bus_space_handle_t ioh; + u_int8_t control; + int error; + int spin; + + if (unit >= lpt_cd.cd_ndevs) + return ENXIO; + sc = lpt_cd.cd_devs[unit]; + if (!sc) + return ENXIO; + + if ((sc->sc_flags & (LPT_POLLED|LPT_NOINTR)) == LPT_POLLED) + return ENXIO; + +#ifdef DIAGNOSTIC + if (sc->sc_state) + printf("%s: stat=0x%x not zero\n", sc->sc_dev.dv_xname, + sc->sc_state); +#endif + + if (sc->sc_state) + return EBUSY; + + sc->sc_state = LPT_INIT; + sc->sc_flags = flags; + LPRINTF(("%s: open: flags=0x%x\n", sc->sc_dev.dv_xname, flags)); + iot = sc->sc_iot; + ioh = sc->sc_ioh; + + if ((flags & LPT_NOPRIME) == 0) { + /* assert INIT for 100 usec to start up printer */ + bus_space_write_1(iot, ioh, lpt_control, LPC_SELECT); + delay(100); + } + + control = LPC_SELECT | LPC_NINIT; + bus_space_write_1(iot, ioh, lpt_control, control); + + /* wait till ready (printer running diagnostics) */ + for (spin = 0; NOT_READY_ERR(); spin += STEP) { + if (spin >= TIMEOUT) { + sc->sc_state = 0; + return EBUSY; + } + + /* wait 1/4 second, give up if we get a signal */ + error = tsleep((caddr_t)sc, LPTPRI | PCATCH, "lptopen", STEP); + if (error != EWOULDBLOCK) { + sc->sc_state = 0; + return error; + } + } + + if ((flags & LPT_NOINTR) == 0) + control |= LPC_IENABLE; + if (flags & LPT_AUTOLF) + control |= LPC_AUTOLF; + sc->sc_control = control; + bus_space_write_1(iot, ioh, lpt_control, control); + + sc->sc_inbuf = geteblk(LPT_BSIZE); + sc->sc_count = 0; + sc->sc_state = LPT_OPEN; + + if ((sc->sc_flags & LPT_NOINTR) == 0) + lptwakeup(sc); + + LPRINTF(("%s: opened\n", sc->sc_dev.dv_xname)); + return 0; +} + +int +lpt_not_ready(status, sc) + u_int8_t status; + struct lpt_softc *sc; +{ + u_int8_t new; + + status = (status ^ LPS_INVERT) & LPS_MASK; + new = status & ~sc->sc_laststatus; + sc->sc_laststatus = status; + + if (new & LPS_SELECT) + log(LOG_NOTICE, "%s: offline\n", sc->sc_dev.dv_xname); + else if (new & LPS_NOPAPER) + log(LOG_NOTICE, "%s: out of paper\n", sc->sc_dev.dv_xname); + else if (new & LPS_NERR) + log(LOG_NOTICE, "%s: output error\n", sc->sc_dev.dv_xname); + + return status; +} + +void +lptwakeup(arg) + void *arg; +{ + struct lpt_softc *sc = arg; + int s; + + s = spltty(); + lptintr(sc); + splx(s); + + timeout(lptwakeup, sc, STEP); +} + +/* + * Close the device, and free the local line buffer. + */ +int +lptclose(dev, flag, mode, p) + dev_t dev; + int flag; + int mode; + struct proc *p; +{ + int unit = LPTUNIT(dev); + struct lpt_softc *sc = lpt_cd.cd_devs[unit]; + bus_space_tag_t iot = sc->sc_iot; + bus_space_handle_t ioh = sc->sc_ioh; + + if (sc->sc_count) + (void) lptpushbytes(sc); + + if ((sc->sc_flags & LPT_NOINTR) == 0) + untimeout(lptwakeup, sc); + + bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); + sc->sc_state = 0; + bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); + brelse(sc->sc_inbuf); + + LPRINTF(("%s: closed\n", sc->sc_dev.dv_xname)); + return 0; +} + +int +lptpushbytes(sc) + struct lpt_softc *sc; +{ + bus_space_tag_t iot = sc->sc_iot; + bus_space_handle_t ioh = sc->sc_ioh; + int error; + + if (sc->sc_flags & LPT_NOINTR) { + int spin, tic; + u_int8_t control = sc->sc_control; + + while (sc->sc_count > 0) { + spin = 0; + while (NOT_READY()) { + if (++spin < sc->sc_spinmax) + continue; + tic = 0; + /* adapt busy-wait algorithm */ + sc->sc_spinmax++; + while (NOT_READY_ERR()) { + /* exponential backoff */ + tic = tic + tic + 1; + if (tic > TIMEOUT) + tic = TIMEOUT; + error = tsleep((caddr_t)sc, + LPTPRI | PCATCH, "lptpsh", tic); + if (error != EWOULDBLOCK) + return error; + } + break; + } + + bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++); + bus_space_write_1(iot, ioh, lpt_control, + control | LPC_STROBE); + sc->sc_count--; + bus_space_write_1(iot, ioh, lpt_control, control); + + /* adapt busy-wait algorithm */ + if (spin*2 + 16 < sc->sc_spinmax) + sc->sc_spinmax--; + } + } else { + int s; + + while (sc->sc_count > 0) { + /* if the printer is ready for a char, give it one */ + if ((sc->sc_state & LPT_OBUSY) == 0) { + LPRINTF(("%s: write %d\n", sc->sc_dev.dv_xname, + sc->sc_count)); + s = spltty(); + (void) lptintr(sc); + splx(s); + } + error = tsleep((caddr_t)sc, LPTPRI | PCATCH, + "lptwrite2", 0); + if (error) + return error; + } + } + return 0; +} + +/* + * Copy a line from user space to a local buffer, then call putc to get the + * chars moved to the output queue. + */ +int +lptwrite(dev, uio, flags) + dev_t dev; + struct uio *uio; + int flags; +{ + struct lpt_softc *sc = lpt_cd.cd_devs[LPTUNIT(dev)]; + size_t n; + int error = 0; + + while ((n = min(LPT_BSIZE, uio->uio_resid)) != 0) { + uiomove(sc->sc_cp = sc->sc_inbuf->b_data, n, uio); + sc->sc_count = n; + error = lptpushbytes(sc); + if (error) { + /* + * Return accurate residual if interrupted or timed + * out. + */ + uio->uio_resid += sc->sc_count; + sc->sc_count = 0; + return error; + } + } + return 0; +} + +/* + * Handle printer interrupts which occur when the printer is ready to accept + * another char. + */ +int +lptintr(arg) + void *arg; +{ + struct lpt_softc *sc = arg; + bus_space_tag_t iot = sc->sc_iot; + bus_space_handle_t ioh = sc->sc_ioh; + + if (((sc->sc_state & LPT_OPEN) == 0 && sc->sc_count == 0) || + (sc->sc_flags & LPT_NOINTR)) + return 0; + + /* is printer online and ready for output */ + if (NOT_READY() && NOT_READY_ERR()) + return -1; + + if (sc->sc_count) { + u_int8_t control = sc->sc_control; + /* send char */ + bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++); + delay (50); + bus_space_write_1(iot, ioh, lpt_control, control | LPC_STROBE); + sc->sc_count--; + bus_space_write_1(iot, ioh, lpt_control, control); + sc->sc_state |= LPT_OBUSY; + } else + sc->sc_state &= ~LPT_OBUSY; + + if (sc->sc_count == 0) { + /* none, wake up the top half to get more */ + wakeup((caddr_t)sc); + } + + return 1; +} + +int +lptioctl(dev, cmd, data, flag, p) + dev_t dev; + u_long cmd; + caddr_t data; + int flag; + struct proc *p; +{ + int error = 0; + + switch (cmd) { + default: + error = ENODEV; + } + + return error; +} |