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freebsd-nq/sys/i386/isa/lpt.c
Geoff Rehmet ee5ae27f05 Changes to lpt driver: 
- ansi prototypes in lpt.c
- a bit of tidying in lpt.c
- ioctl in lpt.c for switching between polling and using interrupts
- added lpt.h - needed for ioctl to allow switching between polling
        and interrupt-driven modes.
1994-04-06 16:42:33 +00:00

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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.
*
* from: unknown origin, 386BSD 0.1
* $Id: lpt.c,v 1.9 1994/02/22 09:05:13 rgrimes Exp $
*/
/*
* Device Driver for AT parallel printer port
* Written by William Jolitz 12/18/90
*/
#include "lpt.h"
#if NLPT > 0
#include "param.h"
#include "systm.h"
#include "proc.h"
#include "user.h"
#include "buf.h"
#include "kernel.h"
#include "ioctl.h"
#include "tty.h"
#include "uio.h"
#include "syslog.h"
#include "i386/isa/isa.h"
#include "i386/isa/isa_device.h"
#include "i386/isa/lptreg.h"
#include "i386/include/lpt.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
/* BIOS printer list - used by BIOS probe*/
#define BIOS_LPT_PORTS 0x408
#define BIOS_PORTS (short *)(KERNBASE+BIOS_LPT_PORTS)
#define BIOS_MAX_LPT 4
#ifndef DEBUG
#define lprintf (void)
#else
#define lprintf if (lptflag) printf
int lptflag = 1;
#endif
#define LPTUNIT(s) ((s)&0x03)
#define LPTFLAGS(s) ((s)&0xfc)
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 0x04 /* if we are a postive init signal */
#define LP_POS_ACK 0x08 /* if we are a positive going ack */
#define LP_NO_PRIME 0x10 /* don't prime the printer at all */
#define LP_PRIMEOPEN 0x20 /* prime on every open */
#define LP_AUTOLF 0x40 /* tell printer to do an automatic lf */
#define LP_BYPASS 0x80 /* bypass printer ready checks */
struct buf *sc_inbuf;
short sc_xfercnt ;
char sc_primed;
char *sc_cp ;
u_char sc_irq ; /* IRQ status of port */
#define LP_HAS_IRQ 0x01 /* we have an irq available */
#define LP_USE_IRQ 0x02 /* we are using our irq */
#define LP_ENABLE_IRQ 0x04 /* enable IRQ on open */
} 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 */
#define INTERRUPTED (1<<7) /* write call was interrupted */
/* status masks to interrogate printer status */
#define RDY_MASK (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR) /* ready ? */
#define LP_READY (LPS_SEL|LPS_NBSY|LPS_NERR)
/* Printer Ready condition - from lpa.c */
/* Only used in polling code */
#define LPS_INVERT (LPS_NBSY | LPS_NACK | LPS_SEL | LPS_NERR)
#define LPS_MASK (LPS_NBSY | LPS_NACK | LPS_OUT | LPS_SEL | LPS_NERR)
#define NOT_READY(x) ((inb(x)^LPS_INVERT)&LPS_MASK)
#define MAX_SLEEP (hz*5) /* Timeout while waiting for device ready */
#define MAX_SPIN 20 /* Max delay for device ready in usecs */
static void lptout (struct lpt_softc * sc);
int lptprobe (struct isa_device *dvp);
int lptattach (struct isa_device *isdp);
void lptintr (int unit);
struct isa_driver lptdriver = {
lptprobe, lptattach, "lpt"
};
/*
* Internal routine to lptprobe to do port tests of one byte value
*/
static int
lpt_port_test(short port, u_char data, u_char mask)
{
int temp, timeout;
data = data & mask;
outb(port, data);
timeout = 10000;
do {
DELAY(10);
temp = inb(port) & mask;
}
while (temp != data && --timeout);
lprintf("Port 0x%x\tout=%x\tin=%x\ttout=%d\n",
port, data, temp, timeout);
return (temp == data);
}
/*
* New lpt port probe Geoff Rehmet - Rhodes University - 14/2/94
* Based partially on Rod Grimes' printer probe
*
* Logic:
* 1) If no port address was given, use the bios detected ports
* and autodetect what ports the printers are on.
* 2) Otherwise, probe the data port at the address given,
* using the method in Rod Grimes' port probe.
* (Much code ripped off directly from Rod's probe.)
*
* Comments from Rod's probe:
* 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.
*
* We are finally left with a mask of 0x14, due to some printers
* being adamant about holding other bits high ........
*
* Before probing the control port, we write a 0 to the data port -
* If not, some printers chuck out garbage when the strobe line
* gets toggled.
*
* 3) Set the data and control ports to a value of 0
*
* This probe routine has been tested on Epson Lx-800, HP LJ3P,
* Epson FX-1170 and C.Itoh 8510RM
* printers.
* Quick exit on fail added.
*/
int
lptprobe(struct isa_device *dvp)
{
short port;
static short next_bios_lpt = 0;
int status;
u_char data;
u_char mask;
int i;
/*
* Make sure there is some way for lptopen to see that
* the port is not configured
* This 0 will remain if the port isn't attached
*/
(lpt_sc + dvp->id_unit)->sc_port = 0;
status = IO_LPTSIZE;
/* If port not specified, use bios list */
if(dvp->id_iobase < 0) { /* port? */
if((next_bios_lpt < BIOS_MAX_LPT) &&
(*(BIOS_PORTS+next_bios_lpt) != 0) ) {
dvp->id_iobase = *(BIOS_PORTS+next_bios_lpt++);
goto end_probe;
} else
return (0);
}
/* Port was explicitly specified */
/* This allows probing of ports unknown to the BIOS */
port = dvp->id_iobase + lpt_data;
mask = 0xff;
data = 0x55; /* Alternating zeros */
if (!lpt_port_test(port, data, mask))
{ status = 0 ; goto end_probe ; }
data = 0xaa; /* Alternating ones */
if (!lpt_port_test(port, data, mask))
{ status = 0 ; goto end_probe ; }
for (i = 0; i < 8; i++) { /* Walking zero */
data = ~(1 << i);
if (!lpt_port_test(port, data, mask))
{ status = 0 ; goto end_probe ; }
}
for (i = 0; i < 8; i++) { /* Walking one */
data = (1 << i);
if (!lpt_port_test(port, data, mask))
{ status = 0 ; goto end_probe ; }
}
end_probe:
/* write 0's to control and data ports */
outb(dvp->id_iobase+lpt_data, 0);
outb(dvp->id_iobase+lpt_control, 0);
return (status);
}
/* XXX Todo - try and detect if interrupt is working */
int
lptattach(struct isa_device *isdp)
{
struct lpt_softc *sc;
sc = lpt_sc + isdp->id_unit;
sc->sc_port = isdp->id_iobase;
sc->sc_primed = 0; /* not primed yet */
outb(sc->sc_port+lpt_control, LPC_NINIT);
/* check if we can use interrupt */
lprintf("oldirq %x\n", sc->sc_irq);
if(isdp->id_irq) {
sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ;
printf("lpt%d: Interrupt-driven port\n", isdp->id_unit);
} else {
sc->sc_irq = 0;
lprintf("lpt%d: Polled port\n", isdp->id_unit);
}
lprintf("irq %x\n", sc->sc_irq);
return (1);
}
/*
* lptopen -- reset the printer, then wait until it's selected and not busy.
*/
int
lptopen(dev_t dev, int flag)
{
struct lpt_softc *sc;
int s;
int trys, port;
u_int unit = LPTUNIT(minor(dev));
sc = lpt_sc + unit;
if ((unit >= NLPT) || (sc->sc_port == 0))
return (ENXIO);
if (sc->sc_state) {
lprintf("lp: still open\n") ;
lprintf("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;
/* set IRQ status according to ENABLE_IRQ flag */
if(sc->sc_irq & LP_ENABLE_IRQ)
sc->sc_irq |= LP_USE_IRQ;
else
sc->sc_irq &= ~LP_USE_IRQ;
/* 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;
lprintf ("status %x\n", inb(port+lpt_status) );
return (EBUSY);
}
/* wait 1/4 second, give up if we get a signal */
if (tsleep ((caddr_t)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));
sc->sc_control = LPC_SEL|LPC_NINIT;
if(sc->sc_flags&LP_AUTOLF)
sc->sc_control |= LPC_AUTOL;
/* enable interrupt if interrupt-driven */
if(sc->sc_irq & LP_USE_IRQ)
sc->sc_control |= LPC_ENA;
outb(port+lpt_control, sc->sc_control);
sc->sc_state = OPEN;
sc->sc_inbuf = geteblk(BUFSIZE);
sc->sc_xfercnt = 0;
splx(s);
/* only use timeout if using interrupt */
lprintf("irq %x\n", sc->sc_irq);
if(sc->sc_irq & LP_USE_IRQ) {
sc->sc_state |= TOUT;
timeout ((timeout_func_t)lptout, (caddr_t)sc, hz/2);
}
lprintf("opened.\n");
return(0);
}
static void
lptout (struct lpt_softc * sc)
{ int pl;
lprintf ("T %x ", inb(sc->sc_port+lpt_status));
if (sc->sc_state&OPEN)
timeout ((timeout_func_t)lptout, (caddr_t)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.
*
* Check for interrupted write call added.
*/
int
lptclose(dev_t dev, int flag)
{
struct lpt_softc *sc = lpt_sc + LPTUNIT(minor(dev));
int port = sc->sc_port;
sc->sc_state &= ~OPEN;
/* if the last write was interrupted, don't complete it */
if((!(sc->sc_state & INTERRUPTED)) && (sc->sc_irq & LP_USE_IRQ))
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 ((caddr_t)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);
}
/*
* pushbytes()
* Workhorse for actually spinning and writing bytes to printer
* Derived from lpa.c
* Originally by ?
*
* This code is only used when we are polling the port
*/
static int
pushbytes(struct lpt_softc * sc)
{
int spin, err, tic;
char ch;
int port = sc->sc_port;
lprintf("p");
/* loop for every character .. */
while (sc->sc_xfercnt > 0) {
/* printer data */
ch = *(sc->sc_cp);
sc->sc_cp++;
sc->sc_xfercnt--;
/*
* Wait for printer ready.
* Loop 20 usecs testing BUSY bit, then sleep
* for exponentially increasing timeout. (vak)
*/
for (spin=0; NOT_READY(port+lpt_status) && spin<MAX_SPIN; ++spin)
DELAY(1); /* XXX delay is NOT this accurate! */
if (spin >= MAX_SPIN) {
tic = 0;
while (NOT_READY(port+lpt_status)) {
/*
* Now sleep, every cycle a
* little longer ..
*/
tic = tic + tic + 1;
/*
* But no more than 10 seconds. (vak)
*/
if (tic > MAX_SLEEP)
tic = MAX_SLEEP;
err = tsleep((caddr_t)sc, LPPRI,
"lptpoll", tic);
if (err != EWOULDBLOCK) {
return (err);
}
}
}
/* output data */
outb(port+lpt_data, ch);
/* strobe */
outb(port+lpt_control, sc->sc_control|LPC_STB);
outb(port+lpt_control, sc->sc_control);
}
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.
*
* Flagging of interrupted write added.
*/
int
lptwrite(dev_t dev, struct uio * uio)
{
register unsigned n;
int pl, err;
struct lpt_softc *sc = lpt_sc + LPTUNIT(minor(dev));
sc->sc_state &= ~INTERRUPTED;
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)&&(sc->sc_irq & LP_USE_IRQ)) {
lprintf("i");
/* 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 (sc->sc_state & OBUSY)
if (err = tsleep ((caddr_t)sc,
LPPRI|PCATCH, "lpwrite", 0)) {
sc->sc_state |= INTERRUPTED;
return(err);
}
}
/* check to see if we must do a polled write */
if(!(sc->sc_irq & LP_USE_IRQ) && (sc->sc_xfercnt)) {
lprintf("p");
if((err = pushbytes(sc)))
return(err);
}
}
return(0);
}
/*
* lptintr -- handle printer interrupts which occur when the printer is
* ready to accept another char.
*
* do checking for interrupted write call.
*/
void
lptintr(int 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)) & RDY_MASK) == LP_READY) {
sc->sc_state = (sc->sc_state | OBUSY) & ~ERROR;
if (sc->sc_xfercnt) {
/* send char */
/*lprintf("%x ", *sc->sc_cp); */
outb(port+lpt_data, *sc->sc_cp++) ;
outb(port+lpt_control, sc->sc_control|LPC_STB);
/* DELAY(X) */
outb(port+lpt_control, sc->sc_control);
/* any more data for printer */
if(--(sc->sc_xfercnt) > 0) return;
}
/*
* No more data waiting for printer.
* Wakeup is not done if write call was interrupted.
*/
sc->sc_state &= ~OBUSY;
if(!(sc->sc_state & INTERRUPTED))
wakeup((caddr_t)sc);
lprintf("w ");
return;
} else { /* check for error */
if(((sts & (LPS_NERR | LPS_OUT) ) != LPS_NERR) &&
(sc->sc_state & OPEN))
sc->sc_state |= ERROR;
}
lprintf("sts %x ", sts);
}
int
lptioctl(dev_t dev, int cmd, caddr_t data, int flag)
{
int error = 0;
struct lpt_softc *sc;
u_int unit = LPTUNIT(minor(dev));
sc = lpt_sc + unit;
switch (cmd) {
case LPT_IRQ :
if(sc->sc_irq & LP_HAS_IRQ) {
/*
* NOTE:
* If the IRQ status is changed,
* this will only be visible on the
* next open.
*/
if(*(int*)data == 0)
sc->sc_irq &= (~LP_ENABLE_IRQ);
else
sc->sc_irq |= LP_ENABLE_IRQ;
log(LOG_NOTICE, "lpt%c switched to %s mode\n",
(char)unit+'0', (sc->sc_irq & LP_ENABLE_IRQ)?
"interrupt-driven":"polled");
} else /* polled port */
error = EOPNOTSUPP;
break;
default:
error = ENODEV;
}
return(error);
}
#endif /* NLPT */
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