NetBSD/sys/dev/isa/lpt.c

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/*
* Copyright (c) 1993, 1994 Charles Hannum.
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* 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.
*
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* $Id: lpt.c,v 1.13 1994/02/19 03:36:12 mycroft Exp $
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*/
/*
* Device Driver for AT parallel printer port
*/
#include "lpt.h"
#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/syslog.h>
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#include <machine/cpu.h>
#include <machine/pio.h>
#include <i386/isa/isa.h>
#include <i386/isa/isa_device.h>
#include <i386/isa/lptreg.h>
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#define TIMEOUT hz*16 /* wait up to 16 seconds for a ready */
#define STEP hz/4
#define LPTPRI (PZERO+8)
#define LPT_BSIZE 1024
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#ifndef DEBUG
#define lprintf
#else
#define lprintf if (lptdebug) printf
int lptdebug = 1;
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#endif
struct lpt_softc {
struct device sc_dev;
size_t sc_count;
struct buf *sc_inbuf;
u_char *sc_cp;
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int sc_spinmax;
u_short sc_iobase;
u_short sc_irq;
u_char sc_state;
#define LPT_OPEN 0x01 /* device is open */
#define LPT_OBUSY 0x02 /* printer is busy doing output */
#define LPT_INIT 0x04 /* waiting to initialize for open */
u_char sc_flags;
#define LPT_AUTOLF 0x20 /* automatic LF on CR */
#define LPT_NOPRIME 0x40 /* don't prime on open */
#define LPT_NOINTR 0x80 /* do not use interrupt */
u_char sc_control;
} lpt_softc[NLPT];
int lptprobe __P((struct isa_device *));
int lptattach __P((struct isa_device *));
int lptintr __P((int));
struct isa_driver lptdriver = {
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lptprobe, lptattach, "lpt"
};
#define LPTUNIT(s) (minor(s) & 0x1f)
#define LPTFLAGS(s) (minor(s) & 0xe0)
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#define LPS_INVERT (LPS_SELECT|LPS_NERR|LPS_NBSY|LPS_NACK)
#define LPS_MASK (LPS_SELECT|LPS_NERR|LPS_NBSY|LPS_NACK|LPS_NOPAPER)
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#ifndef DIAGNOSTIC
#define NOT_READY() ((inb(iobase + lpt_status) ^ LPS_INVERT) & LPS_MASK)
#else
#define NOT_READY() notready(inb(iobase + lpt_status), sc)
static int notready __P((u_char, struct lpt_softc *));
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#endif
static void lptout __P((struct lpt_softc *));
static int pushbytes __P((struct lpt_softc *));
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/*
* Internal routine to lptprobe to do port tests of one byte value.
*/
int
lpt_port_test(port, data, mask)
u_short port;
u_char data, mask;
{
int timeout;
u_char temp;
data &= mask;
outb(port, data);
timeout = 1000;
do {
DELAY(10);
temp = inb(port) & mask;
} while (temp != data && --timeout);
lprintf("lpt: port=0x%x out=0x%x in=0x%x timeout=%d\n", port, data,
temp, timeout);
return (temp == data);
}
/*
* Logic:
* 1) You should be able to write to and read back the same value
* to the data port. Do an alternating zeros, alternating ones,
* walking zero, and walking one test to check for stuck bits.
*
* 2) You should be able to write to and read back the same value
* to the control port lower 5 bits, the upper 3 bits are reserved
* per the IBM PC technical reference manauls and different boards
* do different things with them. Do an alternating zeros, alternating
* ones, walking zero, and walking one test to check for stuck bits.
*
* Some printers drag the strobe line down when the are powered off
* so this bit has been masked out of the control port test.
*
* XXX Some printers may not like a fast pulse on init or strobe, I
* don't know at this point, if that becomes a problem these bits
* should be turned off in the mask byte for the control port test.
*
* 3) Set the data and control ports to a value of 0
*/
int
lptprobe(isa_dev)
struct isa_device *isa_dev;
{
u_short iobase = isa_dev->id_iobase;
u_short port;
u_char mask, data;
int i;
#ifdef DEBUG
#define ABORT do {printf("lptprobe: mask %x data %x failed\n", mask, data); \
return 0;} while (0)
#else
#define ABORT return 0
#endif
port = iobase + lpt_data;
mask = 0xff;
for (;;) {
data = 0x55; /* Alternating zeros */
if (!lpt_port_test(port, data, mask))
ABORT;
data = 0xaa; /* Alternating ones */
if (!lpt_port_test(port, data, mask))
ABORT;
for (i = 0; i < CHAR_BIT; i++) { /* Walking zero */
data = ~(1 << i);
if (!lpt_port_test(port, data, mask))
ABORT;
}
for (i = 0; i < CHAR_BIT; i++) { /* Walking one */
data = (1 << i);
if (!lpt_port_test(port, data, mask))
ABORT;
}
if (port == iobase + lpt_data) {
port = iobase + lpt_control;
#if 1 /* XXX */
mask = 0x04;
#else
mask = 0x1e;
#endif
} else
break;
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}
outb(iobase + lpt_data, 0);
outb(iobase + lpt_control, 0);
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return LPT_NPORTS;
}
int
lptattach(isa_dev)
struct isa_device *isa_dev;
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{
struct lpt_softc *sc = &lpt_softc[isa_dev->id_unit];
u_short iobase = isa_dev->id_iobase;
u_short irq = isa_dev->id_irq;
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/* XXX HACK */
sprintf(sc->sc_dev.dv_xname, "%s%d", lptdriver.name, isa_dev->id_unit);
sc->sc_dev.dv_unit = isa_dev->id_unit;
if (!irq)
printf("%s: polled\n", sc->sc_dev.dv_xname);
sc->sc_iobase = iobase;
sc->sc_irq = irq;
sc->sc_state = 0;
outb(iobase + lpt_control, LPC_NINIT);
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}
/*
* Reset the printer, then wait until it's selected and not busy.
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*/
int
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lptopen(dev, flag)
dev_t dev;
int flag;
{
int unit = LPTUNIT(dev);
u_char flags = LPTFLAGS(dev);
struct lpt_softc *sc;
u_short iobase;
u_char control;
int error;
int spin;
if (unit >= NLPT)
return ENXIO;
sc = &lpt_softc[unit];
if (!sc->sc_iobase)
return ENXIO;
if (sc->sc_irq == 0 && (flags & LPT_NOINTR) == 0)
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 = LPT_INIT;
sc->sc_flags = flags;
lprintf("%s: open: flags=0x%x\n", sc->sc_dev.dv_xname, flags);
iobase = sc->sc_iobase;
if ((flags & LPT_NOPRIME) == 0) {
/* assert INIT for 100 usec to start up printer */
outb(iobase + lpt_control, LPC_SELECT);
DELAY(100);
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}
control = LPC_SELECT | LPC_NINIT;
outb(iobase + lpt_control, control);
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/* wait till ready (printer running diagnostics) */
for (spin = 0; NOT_READY(); spin += STEP) {
if (spin >= TIMEOUT) {
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sc->sc_state = 0;
return EBUSY;
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}
/* wait 1/4 second, give up if we get a signal */
if (error = tsleep((caddr_t)sc, LPTPRI | PCATCH, "lptopen",
STEP) != EWOULDBLOCK) {
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sc->sc_state = 0;
return error;
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}
}
if ((flags & LPT_NOINTR) == 0)
control |= LPC_IENABLE;
if (flags & LPT_AUTOLF)
control |= LPC_AUTOLF;
sc->sc_control = control;
outb(iobase + lpt_control, control);
sc->sc_inbuf = geteblk(LPT_BSIZE);
sc->sc_count = 0;
sc->sc_state = LPT_OPEN;
lptout(sc);
lprintf("%s: opened\n", sc->sc_dev.dv_xname);
return 0;
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}
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#ifdef DIAGNOSTIC
int
notready(status, sc)
u_char status;
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struct lpt_softc *sc;
{
status ^= LPS_INVERT;
if (status & LPS_NOPAPER)
log(LOG_NOTICE, "%s: out of paper\n", sc->sc_dev.dv_xname);
else if (status & LPS_SELECT)
log(LOG_NOTICE, "%s: offline\n", sc->sc_dev.dv_xname);
else if (status & LPS_NERR)
log(LOG_NOTICE, "%s: output error\n", sc->sc_dev.dv_xname);
return status & LPS_MASK;
}
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#endif
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void
lptout(sc)
struct lpt_softc *sc;
{
int s;
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if (sc->sc_flags & LPT_NOINTR)
return;
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s = spltty();
lptintr(sc->sc_dev.dv_unit);
splx(s);
timeout((timeout_t)lptout, (caddr_t)sc, STEP);
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}
/*
* Close the device, and free the local line buffer.
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*/
lptclose(dev, flag)
dev_t dev;
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int flag;
{
int unit = LPTUNIT(dev);
struct lpt_softc *sc = &lpt_softc[unit];
u_short iobase = sc->sc_iobase;
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if (sc->sc_count)
(void) pushbytes(sc);
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outb(iobase + lpt_control, LPC_NINIT);
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sc->sc_state = 0;
outb(iobase + lpt_control, LPC_NINIT);
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brelse(sc->sc_inbuf);
lprintf("%s: closed\n", sc->sc_dev.dv_xname);
return 0;
}
int
pushbytes(sc)
struct lpt_softc *sc;
{
u_short iobase = sc->sc_iobase;
int error;
if (sc->sc_flags & LPT_NOINTR) {
int spin, tic;
u_char control = sc->sc_control;
while (sc->sc_count > 0) {
spin = 0;
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while (NOT_READY() && spin++ < sc->sc_spinmax);
if (spin >= sc->sc_spinmax) {
tic = 0;
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/* adapt busy-wait algorithm */
sc->sc_spinmax++;
while (NOT_READY()) {
/* exponential backoff */
tic = tic + tic + 1;
if (tic > TIMEOUT)
tic = TIMEOUT;
error = tsleep((caddr_t)sc,
LPTPRI | PCATCH, "lptpsh", tic);
if (error != EWOULDBLOCK)
return error;
}
}
outb(iobase + lpt_data, *sc->sc_cp++);
outb(iobase + lpt_control, control | LPC_STROBE);
sc->sc_count--;
outb(iobase + lpt_control, control);
/* adapt busy-wait algorithm */
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if (spin*2 < 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 %d\n", sc->sc_dev.dv_xname,
sc->sc_count);
s = spltty();
(void) lptintr(sc->sc_dev.dv_unit);
splx(s);
}
if (error = tsleep((caddr_t)sc, LPTPRI | PCATCH,
"lptwrite2", 0))
return error;
}
}
return 0;
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}
/*
* Copy a line from user space to a local buffer, then call putc to get the
* chars moved to the output queue.
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*/
lptwrite(dev, uio)
dev_t dev;
struct uio *uio;
{
struct lpt_softc *sc = &lpt_softc[LPTUNIT(dev)];
size_t n;
int error = 0;
while (n = min(LPT_BSIZE, uio->uio_resid)) {
uiomove(sc->sc_cp = sc->sc_inbuf->b_un.b_addr, 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;
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}
}
return 0;
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}
/*
* Handle printer interrupts which occur when the printer is ready to accept
* another char.
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*/
int
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lptintr(unit)
int unit;
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{
struct lpt_softc *sc = &lpt_softc[unit];
u_short iobase = sc->sc_iobase;
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#if 0
if ((sc->sc_state & LPT_OPEN) == 0)
return 0;
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#endif
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/* is printer online and ready for output */
if (NOT_READY())
return 0;
if (sc->sc_count) {
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u_char control = sc->sc_control;
/* send char */
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outb(iobase + lpt_data, *sc->sc_cp++);
outb(iobase + lpt_control, control | LPC_STROBE);
sc->sc_count--;
outb(iobase + lpt_control, control);
sc->sc_state |= LPT_OBUSY;
} else
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 */
wakeup((caddr_t)sc);
}
return 1;
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}
int
lptioctl(dev, cmd, data, flag)
dev_t dev;
int cmd;
caddr_t data;
int flag;
{
int error = 0;
switch (cmd) {
default:
error = ENODEV;
}
return error;
}