NetBSD-5.0.2/sys/dev/mvme/lpt_mvme.c
/* $NetBSD: lpt_mvme.c,v 1.14 2008/06/12 22:45:46 cegger Exp $ */
/*-
* Copyright (c) 1999, 2002 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Steve C. Woodford.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Copyright (c) 1993, 1994 Charles M. Hannum.
* Copyright (c) 1990 William F. Jolitz, TeleMuse
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This software is a component of "386BSD" developed by
* William F. Jolitz, TeleMuse.
* 4. Neither the name of the developer nor the name "386BSD"
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS A COMPONENT OF 386BSD DEVELOPED BY WILLIAM F. JOLITZ
* AND IS INTENDED FOR RESEARCH AND EDUCATIONAL PURPOSES ONLY. THIS
* SOFTWARE SHOULD NOT BE CONSIDERED TO BE A COMMERCIAL PRODUCT.
* THE DEVELOPER URGES THAT USERS WHO REQUIRE A COMMERCIAL PRODUCT
* NOT MAKE USE OF THIS WORK.
*
* FOR USERS WHO WISH TO UNDERSTAND THE 386BSD SYSTEM DEVELOPED
* BY WILLIAM F. JOLITZ, WE RECOMMEND THE USER STUDY WRITTEN
* REFERENCES SUCH AS THE "PORTING UNIX TO THE 386" SERIES
* (BEGINNING JANUARY 1991 "DR. DOBBS JOURNAL", USA AND BEGINNING
* JUNE 1991 "UNIX MAGAZIN", GERMANY) BY WILLIAM F. JOLITZ AND
* LYNNE GREER JOLITZ, AS WELL AS OTHER BOOKS ON UNIX AND THE
* ON-LINE 386BSD USER MANUAL BEFORE USE. A BOOK DISCUSSING THE INTERNALS
* OF 386BSD ENTITLED "386BSD FROM THE INSIDE OUT" WILL BE AVAILABLE LATE 1992.
*
* THIS SOFTWARE IS PROVIDED BY THE DEVELOPER ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE DEVELOPER BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* Device Driver for an MVME68K/MVME88K board's parallel printer port
* This driver attaches above the board-specific back-end.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: lpt_mvme.c,v 1.14 2008/06/12 22:45:46 cegger Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <sys/buf.h>
#include <sys/kernel.h>
#include <sys/ioctl.h>
#include <sys/uio.h>
#include <sys/device.h>
#include <sys/conf.h>
#include <sys/syslog.h>
#include <sys/cpu.h>
#include <sys/bus.h>
#include <dev/mvme/lptvar.h>
#define TIMEOUT hz*16 /* wait up to 16 seconds for a ready */
#define STEP hz/4
#define LPTPRI (PZERO+8)
#define LPT_BSIZE 1024
#if !defined(DEBUG) || !defined(notdef)
#define LPRINTF(a)
#else
#define LPRINTF if (lptdebug) aprint_verbose_dev a
int lptdebug = 1;
#endif
#define LPTUNIT(s) (minor(s) & 0x0f)
#define LPTFLAGS(s) (minor(s) & 0xf0)
static void lpt_wakeup(void *arg);
static int pushbytes(struct lpt_softc *);
extern struct cfdriver lpt_cd;
dev_type_open(lptopen);
dev_type_close(lptclose);
dev_type_write(lptwrite);
dev_type_ioctl(lptioctl);
const struct cdevsw lpt_cdevsw = {
lptopen, lptclose, noread, lptwrite, lptioctl,
nostop, notty, nopoll, nommap, nokqfilter,
};
void
lpt_attach_subr(sc)
struct lpt_softc *sc;
{
sc->sc_state = 0;
callout_init(&sc->sc_wakeup_ch, 0);
}
/*
* Reset the printer, then wait until it's selected and not busy.
*/
int
lptopen(dev_t dev, int flag, int mode, struct lwp *l)
{
u_char flags;
struct lpt_softc *sc;
int error;
int spin;
flags = LPTFLAGS(dev);
sc = device_lookup_private(&lpt_cd, LPTUNIT(dev));
if (!sc)
return (ENXIO);
#ifdef DIAGNOSTIC
if (sc->sc_state)
aprint_verbose_dev(sc->sc_dev, "stat=0x%x not zero\n",
sc->sc_state);
#endif
if (sc->sc_state)
return (EBUSY);
sc->sc_state = LPT_INIT;
sc->sc_flags = flags;
LPRINTF((sc->sc_dev, "open: flags=0x%x\n", flags));
if ((flags & LPT_NOPRIME) == 0) {
/* assert Input Prime for 100 usec to start up printer */
(sc->sc_funcs->lf_iprime) (sc);
}
/* select fast or slow strobe depending on minor device number */
if (flags & LPT_FAST_STROBE)
(sc->sc_funcs->lf_speed) (sc, LPT_STROBE_FAST);
else
(sc->sc_funcs->lf_speed) (sc, LPT_STROBE_SLOW);
/* wait till ready (printer running diagnostics) */
for (spin = 0; (sc->sc_funcs->lf_notrdy) (sc, 1); spin += STEP) {
if (spin >= TIMEOUT) {
sc->sc_state = 0;
return (EBUSY);
}
/* wait 1/4 second, give up if we get a signal */
error = tsleep((void *) sc, LPTPRI | PCATCH, "lptopen", STEP);
if (error != EWOULDBLOCK) {
sc->sc_state = 0;
return (error);
}
}
sc->sc_inbuf = geteblk(LPT_BSIZE);
sc->sc_count = 0;
sc->sc_state = LPT_OPEN;
if ((sc->sc_flags & LPT_NOINTR) == 0)
lpt_wakeup(sc);
(sc->sc_funcs->lf_open) (sc, sc->sc_flags & LPT_NOINTR);
LPRINTF((sc->sc_dev, "opened\n"));
return (0);
}
void
lpt_wakeup(arg)
void *arg;
{
struct lpt_softc *sc;
int s;
sc = arg;
s = spltty();
lpt_intr(sc);
splx(s);
callout_reset(&sc->sc_wakeup_ch, STEP, lpt_wakeup, sc);
}
/*
* Close the device, and free the local line buffer.
*/
int
lptclose(dev_t dev, int flag, int mode, struct lwp *l)
{
struct lpt_softc *sc;
sc = device_lookup_private(&lpt_cd, LPTUNIT(dev));
if (sc->sc_count)
(void) pushbytes(sc);
if ((sc->sc_flags & LPT_NOINTR) == 0)
callout_stop(&sc->sc_wakeup_ch);
(sc->sc_funcs->lf_close) (sc);
sc->sc_state = 0;
brelse(sc->sc_inbuf, 0);
LPRINTF((sc->sc_dev, "%s: closed\n"));
return (0);
}
int
pushbytes(sc)
struct lpt_softc *sc;
{
int s, error, spin, tic;
if (sc->sc_flags & LPT_NOINTR) {
while (sc->sc_count > 0) {
spin = 0;
while ((sc->sc_funcs->lf_notrdy) (sc, 0)) {
if (++spin < sc->sc_spinmax)
continue;
tic = 0;
/* adapt busy-wait algorithm */
sc->sc_spinmax++;
while ((sc->sc_funcs->lf_notrdy) (sc, 1)) {
/* exponential backoff */
tic = tic + tic + 1;
if (tic > TIMEOUT)
tic = TIMEOUT;
error = tsleep((void *) sc,
LPTPRI | PCATCH, "lptpsh", tic);
if (error != EWOULDBLOCK)
return (error);
}
break;
}
(sc->sc_funcs->lf_wrdata) (sc, *sc->sc_cp++);
sc->sc_count--;
/* adapt busy-wait algorithm */
if (spin * 2 + 16 < sc->sc_spinmax)
sc->sc_spinmax--;
}
} else {
while (sc->sc_count > 0) {
/* if the printer is ready for a char, give it one */
if ((sc->sc_state & LPT_OBUSY) == 0) {
LPRINTF((sc->sc_dev, "write %d\n",
sc->sc_count));
s = spltty();
(void) lpt_intr(sc);
splx(s);
}
error = tsleep((void *) sc, LPTPRI | PCATCH,
"lptwrite2", 0);
if (error)
return (error);
}
}
return (0);
}
/*
* Copy a line from user space to a local buffer, then call putc to get the
* chars moved to the output queue.
*/
int
lptwrite(dev_t dev, struct uio *uio, int flags)
{
struct lpt_softc *sc;
size_t n;
int error;
sc = device_lookup_private(&lpt_cd, LPTUNIT(dev));
error = 0;
while ((n = min(LPT_BSIZE, uio->uio_resid)) != 0) {
uiomove(sc->sc_cp = sc->sc_inbuf->b_data, n, uio);
sc->sc_count = n;
error = pushbytes(sc);
if (error) {
/*
* Return accurate residual if interrupted or timed
* out.
*/
uio->uio_resid += sc->sc_count;
sc->sc_count = 0;
return (error);
}
}
return (0);
}
/*
* Handle printer interrupts which occur when the printer is ready to accept
* another char.
*/
int
lpt_intr(sc)
struct lpt_softc *sc;
{
if (sc->sc_count) {
/* send char */
(sc->sc_funcs->lf_wrdata) (sc, *sc->sc_cp++);
sc->sc_count--;
sc->sc_state |= LPT_OBUSY;
} else
sc->sc_state &= ~LPT_OBUSY;
if (sc->sc_count == 0) {
/* none, wake up the top half to get more */
wakeup((void *) sc);
}
return (1);
}
/* ARGSUSED */
int
lptioctl(dev, cmd, data, flag, l)
dev_t dev;
u_long cmd;
void *data;
int flag;
struct lwp *l;
{
return (ENODEV);
}