NetBSD-5.0.2/sys/arch/acorn26/ioc/arcpp.c
/* $NetBSD: arcpp.c,v 1.9 2008/06/11 22:07:49 cegger Exp $ */
/*-
* Copyright (c) 2001 Ben Harris
* 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.
*/
#include <sys/param.h>
__KERNEL_RCSID(0, "$NetBSD: arcpp.c,v 1.9 2008/06/11 22:07:49 cegger Exp $");
#include <sys/conf.h>
#include <sys/device.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/proc.h>
#include <sys/systm.h>
#include <machine/bus.h>
#include <machine/intr.h>
#include <machine/irq.h>
#include <arch/acorn26/iobus/iocvar.h>
#include <arch/acorn26/ioc/arcppreg.h>
#include <arch/acorn26/ioc/latchreg.h>
#include <arch/acorn26/ioc/latchvar.h>
#include <arch/acorn26/ioc/ioebvar.h>
#include "ioeb.h"
struct arcpp_softc {
struct device sc_dev;
void *sc_aih; /* ACK interrupt handler */
struct evcnt sc_aintrcnt; /* ... and count */
void *sc_bih; /* BUSY interrupt handler */
struct evcnt sc_bintrcnt; /* ... and count */
size_t sc_count;
void *sc_inbuf;
u_char *sc_cp;
int sc_spinmax;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
u_char sc_state;
#define ARCPP_OPEN 0x01 /* device is open */
#define ARCPP_OBUSY 0x02 /* printer is busy doing output */
#define ARCPP_INIT 0x04 /* waiting to initialize for open */
u_char sc_flags;
/*#define ARCPP_AUTOLF 0x20 * automatic LF on CR */
/*#define ARCPP_NOPRIME 0x40 * don't prime on open */
/*#define ARCPP_NOINTR 0x80 * do not use interrupt */
u_char sc_laststatus;
};
#define TIMEOUT (hz*16) /* wait up to 16 seconds for a ready */
#define STEP (hz/4)
#define ARCPPPRI (PZERO+8)
#define ARCPP_BSIZE 1024
extern struct cfdriver arcpp_cd;
dev_type_open(arcppopen);
dev_type_close(arcppclose);
dev_type_write(arcppwrite);
const struct cdevsw arcpp_cdevsw = {
arcppopen, arcppclose, noread, arcppwrite, noioctl,
nostop, notty, nopoll, nommap, nokqfilter,
};
#define ARCPPUNIT(s) (minor(s) & 0x1f)
#define ARCPPFLAGS(s) (minor(s) & 0xe0)
static int arcpp_match(struct device *, struct cfdata *, void *);
static void arcpp_attach(struct device *, struct device *, void *);
static int arcppintr(void *);
static int arcpppushbytes(struct arcpp_softc *);
CFATTACH_DECL(arcpp, sizeof(struct arcpp_softc),
arcpp_match, arcpp_attach, NULL, NULL);
static int
arcpp_match(struct device *parent, struct cfdata *cf, void *aux)
{
/*
* The parallel port is write-only, so we can't probe for it.
* Happily, the set of machines it exists on is precisely the
* set that doesn't have IOEBs, so...
*/
#if NIOEB > 0
if (the_ioeb != NULL)
return 0;
#endif
return 1;
}
static void
arcpp_attach(struct device *parent, struct device *self, void *aux)
{
struct arcpp_softc *sc = (void *)self;
struct ioc_attach_args *ioc = aux;
bus_space_tag_t iot;
bus_space_handle_t ioh;
iot = sc->sc_iot = ioc->ioc_fast_t;
ioh = sc->sc_ioh = ioc->ioc_fast_h;
evcnt_attach_dynamic(&sc->sc_aintrcnt, EVCNT_TYPE_INTR, NULL,
self->dv_xname, "ack intr");
evcnt_attach_dynamic(&sc->sc_bintrcnt, EVCNT_TYPE_INTR, NULL,
self->dv_xname, "busy intr");
sc->sc_aih = irq_establish(IRQ_PACK, IPL_LPT, arcppintr, sc,
&sc->sc_aintrcnt);
sc->sc_bih = irq_establish(IRQ_PBSY, IPL_LPT, arcppintr, sc,
&sc->sc_bintrcnt);
/* We're not interested in interrupts while the device is closed. */
irq_disable(sc->sc_aih);
irq_disable(sc->sc_bih);
printf("\n");
}
/*
* Wait until the printer's selected and not busy.
*/
int
arcppopen(dev_t dev, int flag, int mode, struct lwp *l)
{
u_char flags = ARCPPFLAGS(dev);
struct arcpp_softc *sc;
bus_space_tag_t iot;
bus_space_handle_t ioh;
int error, s;
sc = device_lookup_private(&arcpp_cd, ARCPPUNIT(dev));
if (sc == NULL)
return ENXIO;
#ifdef DIAGNOSTIC
if (sc->sc_state)
printf("%s: stat=0x%x not zero\n", sc->sc_dev.dv_xname,
sc->sc_state);
#endif
if (sc->sc_state)
return EBUSY;
sc->sc_state = ARCPP_INIT;
sc->sc_flags = flags;
iot = sc->sc_iot;
ioh = sc->sc_ioh;
s = spllpt();
/* wait till ready (printer running diagnostics) */
irq_enable(sc->sc_bih);
/* XXX Is it really appropriate to time out? */
error = tsleep((void *)sc, ARCPPPRI | PCATCH, "arcppopen", TIMEOUT);
if (error == EWOULDBLOCK) {
sc->sc_state = 0;
return EBUSY;
}
if (error) {
sc->sc_state = 0;
return error;
}
sc->sc_inbuf = malloc(ARCPP_BSIZE, M_DEVBUF, M_WAITOK);
sc->sc_count = 0;
sc->sc_state = ARCPP_OPEN;
arcppintr(sc);
splx(s);
return 0;
}
/*
* Close the device, and free the local line buffer.
*/
int
arcppclose(dev_t dev, int flag, int mode, struct lwp *l)
{
struct arcpp_softc *sc = device_lookup_private(&arcpp_cd, ARCPPUNIT(dev));
if (sc->sc_count)
(void) arcpppushbytes(sc);
irq_disable(sc->sc_aih);
irq_disable(sc->sc_bih);
sc->sc_state = 0;
free(sc->sc_inbuf, M_DEVBUF);
return 0;
}
static int
arcpppushbytes(sc)
struct arcpp_softc *sc;
{
int error;
int s;
while (sc->sc_count > 0) {
/* if the printer is ready for a char, give it one */
if ((sc->sc_state & ARCPP_OBUSY) == 0) {
s = spllpt();
arcppintr(sc);
splx(s);
}
error = tsleep((void *)sc, ARCPPPRI | PCATCH, "arcppwr", 0);
if (error)
return error;
}
return 0;
}
int
arcppwrite(dev_t dev, struct uio *uio, int flags)
{
struct arcpp_softc *sc = device_lookup_private(&arcpp_cd, ARCPPUNIT(dev));
size_t n;
int error = 0;
while ((n = min(ARCPP_BSIZE, uio->uio_resid)) != 0) {
uiomove(sc->sc_cp = sc->sc_inbuf, n, uio);
sc->sc_count = n;
error = arcpppushbytes(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
arcppintr(void *arg)
{
struct arcpp_softc *sc = arg;
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
/* is printer online and ready for output */
if (!ioc_irq_status(IRQ_PBSY)) {
return 0;
}
if (sc->sc_count) {
/* send char */
bus_space_write_1(iot, ioh, ARCPP_DATA, *sc->sc_cp++);
DELAY(1);
latchb_update(LATCHB_NPSTB, 0);
DELAY(1);
sc->sc_count--;
latchb_update(LATCHB_NPSTB, LATCHB_NPSTB);
DELAY(1);
sc->sc_state |= ARCPP_OBUSY;
} else
sc->sc_state &= ~ARCPP_OBUSY;
if (sc->sc_count == 0)
/* none, wake up the top half to get more */
wakeup((void *)sc);
return 1;
}