430 lines
10 KiB
C
430 lines
10 KiB
C
/* $NetBSD: lpt.c,v 1.37 2014/07/25 08:10:32 dholland 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/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: lpt.c,v 1.37 2014/07/25 08:10:32 dholland Exp $");
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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/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 <machine/intr.h>
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#include <atari/dev/ym2149reg.h>
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#include "ioconf.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) aprint_error_dev
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#else
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#define lprintf if (lptdebug) aprint_error_dev
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int lptdebug = 1;
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#endif
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struct lpt_softc {
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device_t 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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void *sc_sicookie;
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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 (void *arg);
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static int pushbytes (struct lpt_softc *);
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static void lptpseudointr (void *);
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int lptintr (struct lpt_softc *);
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int lpthwintr (void *);
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/*
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* Autoconfig stuff
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*/
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static void lpattach (device_t, device_t, void *);
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static int lpmatch (device_t, cfdata_t , void *);
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CFATTACH_DECL_NEW(lp, sizeof(struct lpt_softc),
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lpmatch, lpattach, NULL, NULL);
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const struct cdevsw lp_cdevsw = {
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.d_open = lpopen,
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.d_close = lpclose,
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.d_read = noread,
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.d_write = lpwrite,
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.d_ioctl = lpioctl,
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.d_stop = nostop,
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.d_tty = notty,
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.d_poll = nopoll,
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.d_mmap = nommap,
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.d_kqfilter = nokqfilter,
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.d_discard = nodiscard,
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.d_flag = 0
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};
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/*ARGSUSED*/
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static int
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lpmatch(device_t parent, cfdata_t cf, void *aux)
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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 *)aux, "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(device_t parent, device_t self, void *aux)
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{
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struct lpt_softc *sc = device_private(self);
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sc->sc_dev = self;
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sc->sc_state = 0;
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aprint_normal("\n");
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if (intr_establish(0, USER_VEC, 0, (hw_ifun_t)lpthwintr, sc) == NULL)
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aprint_error_dev(self, "Can't establish interrupt\n");
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ym2149_strobe(1);
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sc->sc_sicookie = softint_establish(SOFTINT_SERIAL, lptpseudointr, sc);
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callout_init(&sc->sc_wakeup_ch, 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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lpopen(dev_t dev, int flag, int mode, struct lwp *l)
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{
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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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sc = device_lookup_private(&lp_cd, LPTUNIT(dev));
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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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aprint_verbose_dev(sc->sc_dev, "stat=0x%x not zero\n",
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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(sc->sc_dev, "open: flags=0x%x\n", 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((void *)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(sc->sc_dev, "opened\n");
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return 0;
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}
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void
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lptwakeup(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_t dev, int flag, int mode, struct lwp *l)
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{
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struct lpt_softc *sc = device_lookup_private(&lp_cd, LPTUNIT(dev));
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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, 0);
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lprintf(sc->sc_dev, "closed\n");
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return 0;
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}
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int
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pushbytes(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((void *)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(sc->sc_dev, "write %d\n",
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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((void *)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_t dev, struct uio *uio, int flags)
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{
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struct lpt_softc *sc = device_lookup_private(&lp_cd,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(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((void *)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(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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lptintr(sc);
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splx(s);
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}
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int
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lpthwintr(void *arg)
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{
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struct lpt_softc *sc;
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sc = arg;
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softint_schedule(sc->sc_sicookie);
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return 1;
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}
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int
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lpioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
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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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