NetBSD/sys/dev/isa/lpt_isa.c

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1993-03-21 12:45:37 +03:00
/*
* 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 parallel printer port
* Written by William Jolitz 12/18/90
*/
#include "lpt.h"
#if NLPT > 0
#include "param.h"
#include "user.h"
#include "buf.h"
#include "systm.h"
#include "kernel.h"
#include "ioctl.h"
#include "tty.h"
#include "uio.h"
#include "i386/isa/isa_device.h"
#include "i386/isa/lptreg.h"
#define LPINITRDY 4 /* wait up to 4 seconds for a ready */
#define LPTOUTTIME 4 /* wait up to 4 seconds for a ready */
#define LPPRI (PZERO+8)
#define BUFSIZE 1024
#ifndef DEBUG
#define lprintf
#else
#define lprintf if (lpflag) printf
#endif
int lptout();
#ifdef DEBUG
int lpflag = 1;
#endif
int lptprobe(), lptattach(), lptintr();
struct isa_driver lptdriver = {
lptprobe, lptattach, "lpt"
};
#define LPTUNIT(s) (((s)>>6)&0x3)
#define LPTFLAGS(s) ((s)&0x3f)
struct lpt_softc {
short sc_port;
short sc_state;
/* default case: negative prime, negative ack, handshake strobe,
prime once */
u_char sc_control;
char sc_flags;
#define LP_POS_INIT 0x01 /* if we are a postive init signal */
#define LP_POS_ACK 0x02 /* if we are a positive going ack */
#define LP_NO_PRIME 0x04 /* don't prime the printer at all */
#define LP_PRIMEOPEN 0x08 /* prime on every open */
#define LP_AUTOLF 0x10 /* tell printer to do an automatic lf */
#define LP_BYPASS 0x20 /* bypass printer ready checks */
struct buf *sc_inbuf;
short sc_xfercnt ;
char sc_primed;
char *sc_cp ;
} lpt_sc[NLPT] ;
/* bits for state */
#define OPEN (1<<0) /* device is open */
#define ASLP (1<<1) /* awaiting draining of printer */
#define ERROR (1<<2) /* error was received from printer */
#define OBUSY (1<<3) /* printer is busy doing output */
#define LPTOUT (1<<4) /* timeout while not selected */
#define TOUT (1<<5) /* timeout while not selected */
#define INIT (1<<6) /* waiting to initialize for open */
lptprobe(idp)
struct isa_device *idp;
{ unsigned v;
outb(idp->id_iobase+lpt_status,0xf0);
v = inb(idp->id_iobase+lpt_status);
outb(idp->id_iobase+lpt_status,0);
if (inb(idp->id_iobase+lpt_status) == v) {
outb(idp->id_iobase+lpt_control,0xff);
DELAY(100);
if (inb(idp->id_iobase+lpt_control) != 0xff)
return(0);
outb(idp->id_iobase+lpt_control,0);
DELAY(100);
if (inb(idp->id_iobase+lpt_control) != 0xe0)
return(0);
return(1);
}
return(0);
}
lptattach(isdp)
struct isa_device *isdp;
{
struct lpt_softc *sc;
sc = lpt_sc + isdp->id_unit;
sc->sc_port = isdp->id_iobase;
outb(sc->sc_port+lpt_control, LPC_NINIT);
return (1);
}
/*
* lptopen -- reset the printer, then wait until it's selected and not busy.
*/
lptopen(dev, flag)
dev_t dev;
int flag;
{
struct lpt_softc *sc = lpt_sc + LPTUNIT(minor(dev));
int s;
int trys, port;
if (sc->sc_state) {
lprintf("lp: still open\n") ;
printf("still open %x\n", sc->sc_state);
return(EBUSY);
} else sc->sc_state |= INIT;
s = spltty();
sc->sc_flags = LPTFLAGS(minor(dev));
lprintf("lp flags 0x%x\n", sc->sc_flags);
port = sc->sc_port;
/* init printer */
if((sc->sc_flags & LP_NO_PRIME) == 0) {
if((sc->sc_flags & LP_PRIMEOPEN) || sc->sc_primed == 0) {
outb(port+lpt_control, 0);
sc->sc_primed++;
DELAY(500);
}
}
outb(port+lpt_control, LPC_SEL|LPC_NINIT);
/* wait till ready (printer running diagnostics) */
trys = 0;
do {
/* ran out of waiting for the printer */
if (trys++ >= LPINITRDY*4) {
splx(s);
sc->sc_state = 0;
printf ("status %x\n", inb(port+lpt_status) );
return (EBUSY);
}
/* wait 1/4 second, give up if we get a signal */
if (tsleep (sc, LPPRI|PCATCH, "lptinit", hz/4) != EWOULDBLOCK) {
sc->sc_state = 0;
splx(s);
return (EBUSY);
}
/* is printer online and ready for output */
} while ((inb(port+lpt_status) & (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) !=
(LPS_SEL|LPS_NBSY|LPS_NERR));
if(sc->sc_flags&LP_AUTOLF) {
outb(port+lpt_control, LPC_SEL|LPC_NINIT|LPC_ENA|LPC_AUTOL);
sc->sc_control = LPC_SEL|LPC_NINIT|LPC_ENA|LPC_AUTOL;
} else {
outb(port+lpt_control, LPC_SEL|LPC_NINIT|LPC_ENA);
sc->sc_control = LPC_SEL|LPC_NINIT|LPC_ENA;
}
sc->sc_state = OPEN | TOUT;
sc->sc_inbuf = geteblk(BUFSIZE);
sc->sc_xfercnt = 0;
splx(s);
timeout (lptout, sc, hz/2);
lprintf("opened.\n");
return(0);
}
lptout (sc)
struct lpt_softc *sc;
{ int pl;
lprintf ("T %x ", inb(sc->sc_port+lpt_status));
if (sc->sc_state&OPEN)
timeout (lptout, sc, hz/2);
else sc->sc_state &= ~TOUT;
if (sc->sc_state & ERROR)
sc->sc_state &= ~ERROR;
/*
* Avoid possible hangs do to missed interrupts
*/
if (sc->sc_xfercnt) {
pl = spltty();
lptintr(sc - lpt_sc);
splx(pl);
} else {
sc->sc_state &= ~OBUSY;
wakeup((caddr_t)sc);
}
}
/*
* lptclose -- close the device, free the local line buffer.
*/
lptclose(dev, flag)
int flag;
{
struct lpt_softc *sc = lpt_sc + LPTUNIT(minor(dev));
int port = sc->sc_port;
sc->sc_state &= ~OPEN;
while ((inb(port+lpt_status) & (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) !=
(LPS_SEL|LPS_NBSY|LPS_NERR) || sc->sc_xfercnt)
/* wait 1/4 second, give up if we get a signal */
if (tsleep (sc, LPPRI|PCATCH, "lpclose", hz) != EWOULDBLOCK)
break;
sc->sc_state = 0;
sc->sc_xfercnt = 0;
outb(sc->sc_port+lpt_control, LPC_NINIT);
brelse(sc->sc_inbuf);
lprintf("closed.\n");
return(0);
}
/*
* lptwrite --copy a line from user space to a local buffer, then call
* putc to get the chars moved to the output queue.
*/
lptwrite(dev, uio)
dev_t dev;
struct uio *uio;
{
register unsigned n;
int pl, err;
struct lpt_softc *sc = lpt_sc + LPTUNIT(minor(dev));
while (n = MIN(BUFSIZE, uio->uio_resid)) {
sc->sc_cp = sc->sc_inbuf->b_un.b_addr ;
uiomove(sc->sc_cp, n, uio);
sc->sc_xfercnt = n ;
while (sc->sc_xfercnt > 0) {
/* if the printer is ready for a char, give it one */
if ((sc->sc_state & OBUSY) == 0){
lprintf("\nC %d. ", sc->sc_xfercnt);
pl = spltty();
lptintr(sc - lpt_sc);
(void) splx(pl);
}
lprintf("W ");
if (err = tsleep (sc, LPPRI|PCATCH, "lpwrite", 0))
return(err);
}
}
return(0);
}
/*
* lptintr -- handle printer interrupts which occur when the printer is
* ready to accept another char.
*/
lptintr(unit)
{
struct lpt_softc *sc = lpt_sc + unit;
int port = sc->sc_port,sts;
/* is printer online and ready for output */
if (((sts=inb(port+lpt_status)) & (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR/*|LPS_NACK*/)) ==
(LPS_SEL|LPS_NBSY|LPS_NERR)) {
/* is this a false interrupt ? */
if ((sc->sc_state & OBUSY)
&& (sts & LPS_NACK) == 0) return;
sc->sc_state |= OBUSY; sc->sc_state &= ~ERROR;
if (sc->sc_xfercnt) {
/* send char */
/*lprintf("%x ", *sc->sc_cp); */
outb(port+lpt_data, *sc->sc_cp++) ; sc->sc_xfercnt-- ;
outb(port+lpt_control, sc->sc_control|LPC_STB);
/* DELAY(X) */
outb(port+lpt_control, sc->sc_control);
}
/* any more bytes for the printer? */
if (sc->sc_xfercnt > 0) return;
/* none, wake up the top half to get more */
sc->sc_state &= ~OBUSY;
wakeup((caddr_t)sc);
lprintf("w ");
return;
} else sc->sc_state |= ERROR;
lprintf("sts %x ", sts);
}
#endif NLP