e0cc03a09b
kqueue provides a stateful and efficient event notification framework currently supported events include socket, file, directory, fifo, pipe, tty and device changes, and monitoring of processes and signals kqueue is supported by all writable filesystems in NetBSD tree (with exception of Coda) and all device drivers supporting poll(2) based on work done by Jonathan Lemon for FreeBSD initial NetBSD port done by Luke Mewburn and Jason Thorpe
399 lines
10 KiB
C
399 lines
10 KiB
C
/* $NetBSD: lpt_mvme.c,v 1.3 2002/10/23 09:13:28 jdolecek 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, nokqfilter,
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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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