399 lines
10 KiB
C
399 lines
10 KiB
C
/* $NetBSD: lpt_mvme.c,v 1.2 2002/09/06 13:18:43 gehenna Exp $ */
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/*-
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* Copyright (c) 1999, 2002 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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* Copyright (c) 1993, 1994 Charles M. Hannum.
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* Copyright (c) 1990 William F. Jolitz, TeleMuse
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* All rights reserved.
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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 software is a component of "386BSD" developed by
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* William F. Jolitz, TeleMuse.
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* 4. Neither the name of the developer nor the name "386BSD"
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS A COMPONENT OF 386BSD DEVELOPED BY WILLIAM F. JOLITZ
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* AND IS INTENDED FOR RESEARCH AND EDUCATIONAL PURPOSES ONLY. THIS
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* SOFTWARE SHOULD NOT BE CONSIDERED TO BE A COMMERCIAL PRODUCT.
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* THE DEVELOPER URGES THAT USERS WHO REQUIRE A COMMERCIAL PRODUCT
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* NOT MAKE USE OF THIS WORK.
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*
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* FOR USERS WHO WISH TO UNDERSTAND THE 386BSD SYSTEM DEVELOPED
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* BY WILLIAM F. JOLITZ, WE RECOMMEND THE USER STUDY WRITTEN
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* REFERENCES SUCH AS THE "PORTING UNIX TO THE 386" SERIES
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* (BEGINNING JANUARY 1991 "DR. DOBBS JOURNAL", USA AND BEGINNING
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* JUNE 1991 "UNIX MAGAZIN", GERMANY) BY WILLIAM F. JOLITZ AND
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* LYNNE GREER JOLITZ, AS WELL AS OTHER BOOKS ON UNIX AND THE
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* ON-LINE 386BSD USER MANUAL BEFORE USE. A BOOK DISCUSSING THE INTERNALS
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* OF 386BSD ENTITLED "386BSD FROM THE INSIDE OUT" WILL BE AVAILABLE LATE 1992.
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*
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* THIS SOFTWARE IS PROVIDED BY THE DEVELOPER ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE DEVELOPER BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Device Driver for an MVME68K/MVME88K 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 <machine/bus.h>
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#include <dev/mvme/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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#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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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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const struct cdevsw lpt_cdevsw = {
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lptopen, lptclose, noread, lptwrite, lptioctl,
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nostop, notty, nopoll, nommap,
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};
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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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callout_init(&sc->sc_wakeup_ch);
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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;
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u_char flags;
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struct lpt_softc *sc;
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int error;
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int spin;
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unit = LPTUNIT(dev);
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flags = LPTFLAGS(dev);
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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;
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int s;
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sc = arg;
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s = spltty();
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lpt_intr(sc);
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splx(s);
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callout_reset(&sc->sc_wakeup_ch, STEP, lpt_wakeup, sc);
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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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struct lpt_softc *sc;
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int unit;
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unit = LPTUNIT(dev);
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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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callout_stop(&sc->sc_wakeup_ch);
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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 s, error, spin, tic;
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if (sc->sc_flags & LPT_NOINTR) {
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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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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;
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size_t n;
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int error;
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sc = lpt_cd.cd_devs[LPTUNIT(dev)];
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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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/* ARGSUSED */
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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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return (ENODEV);
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}
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