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
442 lines
10 KiB
C
442 lines
10 KiB
C
/* $NetBSD: lpt.c,v 1.22 2002/10/23 09:10:52 jdolecek Exp $ */
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/*
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* Copyright (c) 1996 Leo Weppelman
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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 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 originally written for AT parallel printer port. Now
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* drives the printer port on the YM2149.
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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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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/callout.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/iomap.h>
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#include <machine/mfp.h>
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#include <atari/dev/ym2149reg.h>
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#include <atari/atari/intr.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 if (0) printf
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#else
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#define lprintf if (lptdebug) printf
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int lptdebug = 1;
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#endif
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struct lpt_softc {
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struct device sc_dev;
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struct callout sc_wakeup_ch;
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size_t sc_count;
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struct buf *sc_inbuf;
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u_char *sc_cp;
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int sc_spinmax;
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u_char sc_state;
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#define LPT_OPEN 0x01 /* device is open */
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#define LPT_OBUSY 0x02 /* printer is busy doing output */
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#define LPT_INIT 0x04 /* waiting to initialize for open */
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u_char sc_flags;
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#define LPT_AUTOLF 0x20 /* automatic LF on CR XXX: LWP - not yet... */
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#define LPT_NOINTR 0x40 /* do not use interrupt */
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};
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#define LPTUNIT(s) (minor(s) & 0x1f)
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#define LPTFLAGS(s) (minor(s) & 0xe0)
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#define NOT_READY() (MFP->mf_gpip & IO_PBSY)
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/* {b,c}devsw[] function prototypes */
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dev_type_open(lpopen);
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dev_type_close(lpclose);
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dev_type_write(lpwrite);
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dev_type_ioctl(lpioctl);
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static void lptwakeup __P((void *arg));
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static int pushbytes __P((struct lpt_softc *));
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static void lptpseudointr __P((struct lpt_softc *));
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int lptintr __P((struct lpt_softc *));
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int lpthwintr __P((struct lpt_softc *, int));
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/*
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* Autoconfig stuff
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*/
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static void lpattach __P((struct device *, struct device *, void *));
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static int lpmatch __P((struct device *, struct cfdata *, void *));
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CFATTACH_DECL(lp, sizeof(struct lpt_softc),
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lpmatch, lpattach, NULL, NULL);
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extern struct cfdriver lp_cd;
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const struct cdevsw lp_cdevsw = {
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lpopen, lpclose, noread, lpwrite, lpioctl,
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nostop, notty, nopoll, nommap, nokqfilter,
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};
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/*ARGSUSED*/
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static int
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lpmatch(pdp, cfp, auxp)
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struct device *pdp;
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struct cfdata *cfp;
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void *auxp;
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{
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static int lpt_matched = 0;
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/* Match at most 1 lpt unit */
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if (strcmp((char *)auxp, "lpt") || lpt_matched)
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return 0;
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lpt_matched = 1;
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return (1);
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}
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/*ARGSUSED*/
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static void
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lpattach(pdp, dp, auxp)
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struct device *pdp, *dp;
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void *auxp;
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{
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struct lpt_softc *sc = (void *)dp;
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sc->sc_state = 0;
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if (intr_establish(0, USER_VEC, 0, (hw_ifun_t)lpthwintr, sc) == NULL)
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printf("lptattach: Can't establish interrupt\n");
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ym2149_strobe(1);
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printf("\n");
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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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lpopen(dev, flag, mode, p)
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dev_t dev;
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int flag, 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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int sps;
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if (unit >= lp_cd.cd_ndevs)
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return ENXIO;
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sc = lp_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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/* wait till ready (printer running diagnostics) */
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for (spin = 0; NOT_READY(); 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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if ((error = tsleep((caddr_t)sc, LPTPRI | PCATCH, "lptopen",
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STEP)) != 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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lptwakeup(sc);
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sps = splhigh();
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MFP->mf_imrb |= IB_PBSY;
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MFP->mf_ierb |= IB_PBSY;
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splx(sps);
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}
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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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lptwakeup(arg)
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void *arg;
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{
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struct lpt_softc *sc = arg;
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lptpseudointr(sc);
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callout_reset(&sc->sc_wakeup_ch, STEP, lptwakeup, 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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lpclose(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 = lp_cd.cd_devs[unit];
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int sps;
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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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sps = splhigh();
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MFP->mf_ierb &= ~IB_PBSY;
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MFP->mf_imrb &= ~IB_PBSY;
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splx(sps);
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}
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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 (NOT_READY()) {
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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 (NOT_READY()) {
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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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ym2149_write_ioport(YM_IOB, *sc->sc_cp++);
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ym2149_strobe(0);
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sc->sc_count--;
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ym2149_strobe(1);
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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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(void) lptpseudointr(sc);
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}
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if ((error = tsleep((caddr_t)sc, LPTPRI | PCATCH,
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"lptwrite2", 0)) != 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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* 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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lpwrite(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 = lp_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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lptintr(sc)
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struct lpt_softc *sc;
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{
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/* is printer online and ready for output */
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if (NOT_READY())
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return 0;
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if (sc->sc_count) {
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/* send char */
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ym2149_write_ioport(YM_IOB, *sc->sc_cp++);
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ym2149_strobe(0);
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sc->sc_count--;
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ym2149_strobe(1);
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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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static void
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lptpseudointr(sc)
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struct lpt_softc *sc;
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{
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int s;
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s = spltty();
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lptintr(sc);
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splx(s);
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}
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int
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lpthwintr(sc, sr)
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struct lpt_softc *sc;
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int sr;
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{
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if (!BASEPRI(sr))
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add_sicallback((si_farg)lptpseudointr, sc, 0);
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else lptpseudointr(sc);
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return 1;
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}
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int
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lpioctl(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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