NetBSD/sys/arch/mvme68k/dev/lpt.c

497 lines
11 KiB
C

/* $NetBSD: lpt.c,v 1.1 1996/11/09 03:52:51 chuck Exp $ */
/*
* Copyright (c) 1996 Steve Woodford
* Copyright (c) 1993, 1994 Charles 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 the MVME147's parallel printer port
* Based mostly on the AT parallel port driver by Charles Hannum and
* William F. Jolitz.
* Some additional code is based on the NetBSD/atari parallel port
* driver, by Leo Weppelman.
*/
#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 <machine/cpu.h>
#include <mvme68k/dev/lptreg.h>
#include <mvme68k/dev/pccreg.h>
#include <mvme68k/dev/pccvar.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) printf a
int lptdebug = 1;
#endif
struct lpt_softc {
struct device sc_dev;
union lpt_regs *sc_regs;
size_t sc_count;
struct buf *sc_inbuf;
u_char *sc_cp;
int sc_spinmax;
int sc_ipl;
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_FAST_STROBE 0x10 /* Select 1.6uS strobe pulse */
#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_prir;
u_char sc_laststatus;
};
/* {b,c}devsw[] function prototypes */
dev_type_open(lptopen);
dev_type_close(lptclose);
dev_type_write(lptwrite);
dev_type_ioctl(lptioctl);
int lptintr __P((void *));
/*
* Autoconfig stuff
*/
static int lpt_pcc_match __P((struct device *, void *, void *));
static void lpt_pcc_attach __P((struct device *, struct device *, void *));
struct cfattach lpt_pcc_ca = {
sizeof(struct lpt_softc), lpt_pcc_match, lpt_pcc_attach
};
struct cfdriver lpt_cd = {
NULL, "lpt", DV_DULL, NULL, 0
};
#define LPTUNIT(s) (minor(s) & 0x0f)
#define LPTFLAGS(s) (minor(s) & 0xf0)
#define LPS_INVERT (LPS_SELECT)
#define LPS_MASK (LPS_SELECT|LPS_FAULT|LPS_BUSY|LPS_PAPER_EMPTY)
#define NOT_READY() ((sc->sc_regs->pr_status ^ LPS_INVERT) & LPS_MASK)
#define NOT_READY_ERR() not_ready(sc->sc_regs->pr_status, sc)
static int not_ready __P((u_char, struct lpt_softc *));
static void lptwakeup __P((void *arg));
static int pushbytes __P((struct lpt_softc *));
/*ARGSUSED*/
static int
lpt_pcc_match(pdp, match, auxp)
struct device *pdp;
void *match, *auxp;
{
struct cfdata *cf = match;
struct pcc_attach_args *pa = auxp;
if (strcmp(pa->pa_name, lpt_cd.cd_name))
return (0);
pa->pa_ipl = cf->pcccf_ipl;
return (1);
}
/*ARGSUSED*/
static void
lpt_pcc_attach(pdp, dp, auxp)
struct device *pdp, *dp;
void *auxp;
{
struct lpt_softc *sc = (void *)dp;
struct pcc_attach_args *pa = auxp;
/*
* Get pointer to regs
*/
sc->sc_regs = (union lpt_regs *) PCC_VADDR(pa->pa_offset);
sc->sc_ipl = pa->pa_ipl & PCC_IMASK;
sc->sc_state = 0;
sc->sc_laststatus = 0;
/*
* Hook into the printer interrupt
*/
pccintr_establish(PCCV_PRINTER, lptintr, sc->sc_ipl, sc);
/*
* Disable interrupts until device is opened
*/
sys_pcc->pr_int = 0;
printf("\n");
}
/*
* Reset the printer, then wait until it's selected and not busy.
*/
int
lptopen(dev, flag, mode, p)
dev_t dev;
int flag;
int mode;
struct proc *p;
{
int unit = LPTUNIT(dev);
u_char flags = LPTFLAGS(dev);
struct lpt_softc *sc;
int error;
int spin;
if (unit >= lpt_cd.cd_ndevs)
return ENXIO;
sc = lpt_cd.cd_devs[unit];
if (!sc)
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));
if ((flags & LPT_NOPRIME) == 0) {
/* assert Input Prime for 100 usec to start up printer */
sys_pcc->pr_cr = LPC_INPUT_PRIME;
delay(100);
}
/* select fast or slow strobe depending on minor device number */
if ( flags & LPT_FAST_STROBE )
sys_pcc->pr_cr = LPC_FAST_STROBE;
else
sys_pcc->pr_cr = 0;
/* 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((caddr_t)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;
sc->sc_prir = 0;
sys_pcc->pr_int = LPI_ACKINT | LPI_FAULTINT;
if ((sc->sc_flags & LPT_NOINTR) == 0)
{
int sps;
lptwakeup(sc);
sc->sc_prir = sc->sc_ipl | LPI_ENABLE;
sps = splhigh();
sys_pcc->pr_int = sc->sc_prir;
splx(sps);
}
LPRINTF(("%s: opened\n", sc->sc_dev.dv_xname));
return 0;
}
int
not_ready(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 (new & LPS_SELECT)
log(LOG_NOTICE, "%s: offline\n", sc->sc_dev.dv_xname);
else if (new & LPS_PAPER_EMPTY)
log(LOG_NOTICE, "%s: out of paper\n", sc->sc_dev.dv_xname);
else if (new & LPS_FAULT)
log(LOG_NOTICE, "%s: output error\n", sc->sc_dev.dv_xname);
sys_pcc->pr_int = sc->sc_prir | LPI_FAULTINT;
return status;
}
void
lptwakeup(arg)
void *arg;
{
struct lpt_softc *sc = arg;
int s;
s = spltty();
lptintr(sc);
splx(s);
timeout(lptwakeup, sc, STEP);
}
/*
* Close the device, and free the local line buffer.
*/
int
lptclose(dev, flag, mode, p)
dev_t dev;
int flag;
int mode;
struct proc *p;
{
int unit = LPTUNIT(dev);
struct lpt_softc *sc = lpt_cd.cd_devs[unit];
if (sc->sc_count)
(void) pushbytes(sc);
if ((sc->sc_flags & LPT_NOINTR) == 0)
{
int sps;
untimeout(lptwakeup, sc);
sc->sc_prir = 0;
sps = splhigh();
sys_pcc->pr_int = LPI_ACKINT | LPI_FAULTINT;
splx(sps);
}
sc->sc_state = 0;
brelse(sc->sc_inbuf);
LPRINTF(("%s: closed\n", sc->sc_dev.dv_xname));
return 0;
}
int
pushbytes(sc)
struct lpt_softc *sc;
{
int error;
if (sc->sc_flags & LPT_NOINTR) {
int spin, tic;
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((caddr_t)sc,
LPTPRI | PCATCH, "lptpsh", tic);
if (error != EWOULDBLOCK)
return error;
}
break;
}
sc->sc_regs->pr_data = *sc->sc_cp++;
sc->sc_count--;
/* 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 %d\n", sc->sc_dev.dv_xname,
sc->sc_count));
s = spltty();
(void) lptintr(sc);
splx(s);
}
error = tsleep((caddr_t)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, uio, flags)
dev_t dev;
struct uio *uio;
int flags;
{
struct lpt_softc *sc = lpt_cd.cd_devs[LPTUNIT(dev)];
size_t n;
int 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
lptintr(arg)
void *arg;
{
struct lpt_softc *sc = arg;
#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) {
/* send char */
sc->sc_regs->pr_data = *sc->sc_cp++;
sc->sc_count--;
sc->sc_state |= LPT_OBUSY;
} else
sc->sc_state &= ~LPT_OBUSY;
if ( sys_pcc->pr_int & LPI_ACKINT )
sys_pcc->pr_int = sc->sc_prir | LPI_ACKINT;
if (sc->sc_count == 0) {
/* none, wake up the top half to get more */
wakeup((caddr_t)sc);
}
return 1;
}
int
lptioctl(dev, cmd, data, flag, p)
dev_t dev;
u_long cmd;
caddr_t data;
int flag;
struct proc *p;
{
int error = 0;
switch (cmd) {
default:
error = ENODEV;
}
return error;
}