NetBSD-5.0.2/sys/dev/ic/lpt.c
/* $NetBSD: lpt.c,v 1.75 2008/06/10 22:53:08 cegger Exp $ */
/*
* 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 AT style parallel printer port
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: lpt.c,v 1.75 2008/06/10 22:53:08 cegger Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <sys/malloc.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/intr.h>
#include <sys/bus.h>
#include <dev/ic/lptreg.h>
#include <dev/ic/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
#define LPTDEBUG
#ifndef LPTDEBUG
#define LPRINTF(a)
#else
#define LPRINTF(a) if (lptdebug) printf a
int lptdebug = 0;
#endif
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, D_OTHER,
};
#define LPTUNIT(s) (minor(s) & 0x1f)
#define LPTFLAGS(s) (minor(s) & 0xe0)
static void lptsoftintr(void *);
void
lpt_attach_subr(sc)
struct lpt_softc *sc;
{
bus_space_tag_t iot;
bus_space_handle_t ioh;
sc->sc_state = 0;
iot = sc->sc_iot;
ioh = sc->sc_ioh;
bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT);
callout_init(&sc->sc_wakeup_ch, 0);
sc->sc_sih = softint_establish(SOFTINT_SERIAL, lptsoftintr, sc);
sc->sc_dev_ok = 1;
}
int
lpt_detach_subr(device_t self, int flags)
{
struct lpt_softc *sc = device_private(self);
sc->sc_dev_ok = 0;
softint_disestablish(sc->sc_sih);
callout_destroy(&sc->sc_wakeup_ch);
return 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 = LPTFLAGS(dev);
struct lpt_softc *sc;
bus_space_tag_t iot;
bus_space_handle_t ioh;
u_char control;
int error;
int spin;
sc = device_lookup_private(&lpt_cd, LPTUNIT(dev));
if (!sc || !sc->sc_dev_ok)
return ENXIO;
#if 0 /* XXX what to do? */
if (sc->sc_irq == IRQUNK && (flags & LPT_NOINTR) == 0)
return ENXIO;
#endif
#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(("%s: open: flags=0x%x\n", device_xname(sc->sc_dev),
(unsigned)flags));
iot = sc->sc_iot;
ioh = sc->sc_ioh;
if ((flags & LPT_NOPRIME) == 0) {
/* assert INIT for 100 usec to start up printer */
bus_space_write_1(iot, ioh, lpt_control, LPC_SELECT);
delay(100);
}
control = LPC_SELECT | LPC_NINIT;
bus_space_write_1(iot, ioh, lpt_control, control);
/* wait till ready (printer running diagnostics) */
for (spin = 0; NOT_READY_ERR(); 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;
}
}
if ((flags & LPT_NOINTR) == 0)
control |= LPC_IENABLE;
if (flags & LPT_AUTOLF)
control |= LPC_AUTOLF;
sc->sc_control = control;
bus_space_write_1(iot, ioh, lpt_control, control);
sc->sc_inbuf = malloc(LPT_BSIZE, M_DEVBUF, M_WAITOK);
sc->sc_count = 0;
sc->sc_state = LPT_OPEN;
if ((sc->sc_flags & LPT_NOINTR) == 0)
lptwakeup(sc);
LPRINTF(("%s: opened\n", device_xname(sc->sc_dev)));
return 0;
}
int
lptnotready(status, sc)
u_char status;
struct lpt_softc *sc;
{
u_char new;
status = (status ^ LPS_INVERT) & LPS_MASK;
new = status & ~sc->sc_laststatus;
sc->sc_laststatus = status;
if (sc->sc_state & LPT_OPEN) {
if (new & LPS_SELECT)
log(LOG_NOTICE,
"%s: offline\n", device_xname(sc->sc_dev));
else if (new & LPS_NOPAPER)
log(LOG_NOTICE,
"%s: out of paper\n", device_xname(sc->sc_dev));
else if (new & LPS_NERR)
log(LOG_NOTICE,
"%s: output error\n", device_xname(sc->sc_dev));
}
return status;
}
void
lptwakeup(arg)
void *arg;
{
struct lpt_softc *sc = arg;
int s;
s = spllpt();
lptintr(sc);
splx(s);
callout_reset(&sc->sc_wakeup_ch, STEP, lptwakeup, 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 =
device_lookup_private(&lpt_cd, LPTUNIT(dev));
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
if (sc->sc_count)
(void) lptpushbytes(sc);
if ((sc->sc_flags & LPT_NOINTR) == 0)
callout_stop(&sc->sc_wakeup_ch);
bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT);
sc->sc_state = 0;
bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT);
free(sc->sc_inbuf, M_DEVBUF);
LPRINTF(("%s: closed\n", device_xname(sc->sc_dev)));
return 0;
}
int
lptpushbytes(sc)
struct lpt_softc *sc;
{
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
int error;
if (sc->sc_flags & LPT_NOINTR) {
int spin, tic;
u_char control = sc->sc_control;
while (sc->sc_count > 0) {
spin = 0;
while (NOT_READY()) {
if (++spin < sc->sc_spinmax)
continue;
tic = 0;
/* adapt busy-wait algorithm */
sc->sc_spinmax++;
while (NOT_READY_ERR()) {
/* 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;
}
bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++);
DELAY(1);
bus_space_write_1(iot, ioh, lpt_control,
control | LPC_STROBE);
DELAY(1);
sc->sc_count--;
bus_space_write_1(iot, ioh, lpt_control, control);
DELAY(1);
/* adapt busy-wait algorithm */
if (spin*2 + 16 < sc->sc_spinmax)
sc->sc_spinmax--;
}
} else {
int s;
while (sc->sc_count > 0) {
/* if the printer is ready for a char, give it one */
if ((sc->sc_state & LPT_OBUSY) == 0) {
LPRINTF(("%s: write %lu\n",
device_xname(sc->sc_dev),
(u_long)sc->sc_count));
s = spllpt();
(void) lptintr(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 =
device_lookup_private(&lpt_cd, LPTUNIT(dev));
size_t n;
int error = 0;
while ((n = min(LPT_BSIZE, uio->uio_resid)) != 0) {
uiomove(sc->sc_cp = sc->sc_inbuf, n, uio);
sc->sc_count = n;
error = lptpushbytes(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
lptintr(arg)
void *arg;
{
struct lpt_softc *sc = arg;
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
#if 0
if ((sc->sc_state & LPT_OPEN) == 0)
return 0;
#endif
/* is printer online and ready for output */
if (NOT_READY() && NOT_READY_ERR())
return 0;
if (sc->sc_count) {
u_char control = sc->sc_control;
/* send char */
bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++);
DELAY(1);
bus_space_write_1(iot, ioh, lpt_control, control | LPC_STROBE);
DELAY(1);
sc->sc_count--;
bus_space_write_1(iot, ioh, lpt_control, control);
DELAY(1);
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 */
softint_schedule(sc->sc_sih);
}
return 1;
}
static void
lptsoftintr(void *cookie)
{
wakeup(cookie);
}
int
lptioctl(dev_t dev, u_long cmd, void *data,
int flag, struct lwp *l)
{
return ENODEV;
}