343 lines
7.6 KiB
C
343 lines
7.6 KiB
C
/* $NetBSD: lpt.c,v 1.5 1999/02/14 17:54:28 scw Exp $ */
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/*-
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* Copyright (c) 1999 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Steve C. Woodford.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Device Driver for an MVME1xx board's parallel printer port
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* This driver attaches above the board-specific back-end.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/user.h>
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#include <sys/buf.h>
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#include <sys/kernel.h>
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#include <sys/ioctl.h>
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#include <sys/uio.h>
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#include <sys/device.h>
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#include <sys/conf.h>
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#include <sys/syslog.h>
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#include <machine/cpu.h>
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#include <mvme68k/dev/lptvar.h>
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#define TIMEOUT hz*16 /* wait up to 16 seconds for a ready */
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#define STEP hz/4
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#define LPTPRI (PZERO+8)
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#define LPT_BSIZE 1024
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#if !defined(DEBUG) || !defined(notdef)
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#define LPRINTF(a)
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#else
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#define LPRINTF if (lptdebug) printf a
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int lptdebug = 1;
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#endif
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/* {b,c}devsw[] function prototypes */
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dev_type_open(lptopen);
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dev_type_close(lptclose);
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dev_type_write(lptwrite);
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dev_type_ioctl(lptioctl);
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#define LPTUNIT(s) (minor(s) & 0x0f)
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#define LPTFLAGS(s) (minor(s) & 0xf0)
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static void lpt_wakeup __P((void *arg));
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static int pushbytes __P((struct lpt_softc *));
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extern struct cfdriver lpt_cd;
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void
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lpt_attach_subr(sc)
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struct lpt_softc *sc;
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{
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sc->sc_state = 0;
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}
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/*
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* Reset the printer, then wait until it's selected and not busy.
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*/
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int
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lptopen(dev, flag, mode, p)
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dev_t dev;
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int flag;
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int mode;
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struct proc *p;
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{
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int unit = LPTUNIT(dev);
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u_char flags = LPTFLAGS(dev);
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struct lpt_softc *sc;
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int error;
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int spin;
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if (unit >= lpt_cd.cd_ndevs)
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return ENXIO;
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sc = lpt_cd.cd_devs[unit];
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if (!sc)
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return ENXIO;
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#ifdef DIAGNOSTIC
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if (sc->sc_state)
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printf("%s: stat=0x%x not zero\n", sc->sc_dev.dv_xname,
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sc->sc_state);
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#endif
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if (sc->sc_state)
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return EBUSY;
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sc->sc_state = LPT_INIT;
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sc->sc_flags = flags;
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LPRINTF(("%s: open: flags=0x%x\n", sc->sc_dev.dv_xname, flags));
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if ((flags & LPT_NOPRIME) == 0) {
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/* assert Input Prime for 100 usec to start up printer */
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(sc->sc_funcs->lf_iprime)(sc);
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}
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/* select fast or slow strobe depending on minor device number */
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if ( flags & LPT_FAST_STROBE )
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(sc->sc_funcs->lf_speed)(sc, LPT_STROBE_FAST);
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else
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(sc->sc_funcs->lf_speed)(sc, LPT_STROBE_SLOW);
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/* wait till ready (printer running diagnostics) */
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for (spin = 0; (sc->sc_funcs->lf_notrdy)(sc, 1); spin += STEP) {
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if (spin >= TIMEOUT) {
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sc->sc_state = 0;
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return EBUSY;
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}
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/* wait 1/4 second, give up if we get a signal */
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error = tsleep((caddr_t)sc, LPTPRI | PCATCH, "lptopen", STEP);
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if (error != EWOULDBLOCK) {
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sc->sc_state = 0;
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return error;
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}
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}
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sc->sc_inbuf = geteblk(LPT_BSIZE);
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sc->sc_count = 0;
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sc->sc_state = LPT_OPEN;
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if ( (sc->sc_flags & LPT_NOINTR) == 0 )
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lpt_wakeup(sc);
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(sc->sc_funcs->lf_open)(sc, sc->sc_flags & LPT_NOINTR);
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LPRINTF(("%s: opened\n", sc->sc_dev.dv_xname));
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return 0;
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}
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void
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lpt_wakeup(arg)
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void *arg;
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{
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struct lpt_softc *sc = arg;
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int s;
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s = spltty();
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lpt_intr(sc);
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splx(s);
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timeout(lpt_wakeup, sc, STEP);
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}
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/*
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* Close the device, and free the local line buffer.
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*/
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int
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lptclose(dev, flag, mode, p)
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dev_t dev;
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int flag;
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int mode;
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struct proc *p;
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{
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int unit = LPTUNIT(dev);
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struct lpt_softc *sc = lpt_cd.cd_devs[unit];
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if (sc->sc_count)
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(void) pushbytes(sc);
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if ( (sc->sc_flags & LPT_NOINTR) == 0 )
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untimeout(lpt_wakeup, sc);
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(sc->sc_funcs->lf_close)(sc);
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sc->sc_state = 0;
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brelse(sc->sc_inbuf);
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LPRINTF(("%s: closed\n", sc->sc_dev.dv_xname));
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return 0;
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}
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int
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pushbytes(sc)
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struct lpt_softc *sc;
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{
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int error;
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if (sc->sc_flags & LPT_NOINTR) {
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int spin, tic;
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while (sc->sc_count > 0) {
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spin = 0;
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while ( (sc->sc_funcs->lf_notrdy)(sc, 0) ) {
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if (++spin < sc->sc_spinmax)
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continue;
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tic = 0;
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/* adapt busy-wait algorithm */
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sc->sc_spinmax++;
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while((sc->sc_funcs->lf_notrdy)(sc,1)) {
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/* exponential backoff */
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tic = tic + tic + 1;
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if (tic > TIMEOUT)
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tic = TIMEOUT;
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error = tsleep((caddr_t)sc,
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LPTPRI | PCATCH, "lptpsh", tic);
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if (error != EWOULDBLOCK)
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return error;
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}
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break;
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}
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(sc->sc_funcs->lf_wrdata)(sc, *sc->sc_cp++);
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sc->sc_count--;
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/* adapt busy-wait algorithm */
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if (spin*2 + 16 < sc->sc_spinmax)
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sc->sc_spinmax--;
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}
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} else {
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int s;
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while (sc->sc_count > 0) {
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/* if the printer is ready for a char, give it one */
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if ((sc->sc_state & LPT_OBUSY) == 0) {
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LPRINTF(("%s: write %d\n", sc->sc_dev.dv_xname,
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sc->sc_count));
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s = spltty();
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(void) lpt_intr(sc);
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splx(s);
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}
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error = tsleep((caddr_t)sc, LPTPRI | PCATCH,
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"lptwrite2", 0);
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if (error)
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return error;
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}
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}
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return 0;
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}
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/*
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* Copy a line from user space to a local buffer, then call putc to get the
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* chars moved to the output queue.
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*/
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int
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lptwrite(dev, uio, flags)
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dev_t dev;
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struct uio *uio;
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int flags;
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{
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struct lpt_softc *sc = lpt_cd.cd_devs[LPTUNIT(dev)];
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size_t n;
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int error = 0;
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while ((n = min(LPT_BSIZE, uio->uio_resid)) != 0) {
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uiomove(sc->sc_cp = sc->sc_inbuf->b_data, n, uio);
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sc->sc_count = n;
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error = pushbytes(sc);
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if (error) {
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/*
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* Return accurate residual if interrupted or timed
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* out.
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*/
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uio->uio_resid += sc->sc_count;
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sc->sc_count = 0;
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return error;
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}
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}
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return 0;
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}
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/*
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* Handle printer interrupts which occur when the printer is ready to accept
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* another char.
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*/
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int
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lpt_intr(sc)
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struct lpt_softc *sc;
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{
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if (sc->sc_count) {
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/* send char */
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(sc->sc_funcs->lf_wrdata)(sc, *sc->sc_cp++);
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sc->sc_count--;
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sc->sc_state |= LPT_OBUSY;
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} else
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sc->sc_state &= ~LPT_OBUSY;
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if (sc->sc_count == 0) {
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/* none, wake up the top half to get more */
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wakeup((caddr_t)sc);
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}
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return 1;
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}
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int
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lptioctl(dev, cmd, data, flag, p)
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dev_t dev;
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u_long cmd;
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caddr_t data;
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int flag;
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struct proc *p;
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{
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int error = 0;
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switch (cmd) {
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default:
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error = ENODEV;
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}
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return error;
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}
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