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freebsd-skq/sys/i386/isa/lpt.c
joerg e20b650550 Work around a braindead signal handling in many newer HP printers. 
They don't have BUSY de-asserted by the time they ACK (and thus cause
an interrupt).  The workaround is to try seeing if the BUSY will be
de-asserted soon, and if not, to use an incremental backoff and
semi-polled mode instead of the fixed timeout with 1/2 s we've been
using previously (that caused the printer to run really slooow).

Printers that have been working previously should not be affected by
this.
1996-04-04 12:28:36 +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 1.52 1996/03/29 11:54:56 bde Exp $
*/
/*
* Device Driver for AT parallel printer port
* Written by William Jolitz 12/18/90
*/
/*
* Parallel port TCP/IP interfaces added. I looked at the driver from
* MACH but this is a complete rewrite, and btw. incompatible, and it
* should perform better too. I have never run the MACH driver though.
*
* This driver sends two bytes (0x08, 0x00) in front of each packet,
* to allow us to distinguish another format later.
*
* Now added an Linux/Crynwr compatibility mode which is enabled using
* IF_LINK0 - Tim Wilkinson.
*
* TODO:
* Make HDLC/PPP mode, use IF_LLC1 to enable.
*
* Connect the two computers using a Laplink parallel cable to use this
* feature:
*
* +----------------------------------------+
* |A-name A-End B-End Descr. Port/Bit |
* +----------------------------------------+
* |DATA0 2 15 Data 0/0x01 |
* |-ERROR 15 2 1/0x08 |
* +----------------------------------------+
* |DATA1 3 13 Data 0/0x02 |
* |+SLCT 13 3 1/0x10 |
* +----------------------------------------+
* |DATA2 4 12 Data 0/0x04 |
* |+PE 12 4 1/0x20 |
* +----------------------------------------+
* |DATA3 5 10 Strobe 0/0x08 |
* |-ACK 10 5 1/0x40 |
* +----------------------------------------+
* |DATA4 6 11 Data 0/0x10 |
* |BUSY 11 6 1/~0x80 |
* +----------------------------------------+
* |GND 18-25 18-25 GND - |
* +----------------------------------------+
*
* Expect transfer-rates up to 75 kbyte/sec.
*
* If GCC could correctly grok
* register int port asm("edx")
* the code would be cleaner
*
* Poul-Henning Kamp <phk@freebsd.org>
*/
#include "lpt.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/proc.h>
#include <sys/buf.h>
#include <sys/kernel.h>
#include <sys/ioctl.h>
#include <sys/uio.h>
#include <sys/syslog.h>
#include <sys/devconf.h>
#ifdef DEVFS
#include <sys/devfsext.h>
#endif /*DEVFS*/
#include <machine/clock.h>
#include <machine/lpt.h>
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/pmap.h>
#include <i386/isa/isa.h>
#include <i386/isa/isa_device.h>
#include <i386/isa/lptreg.h>
#ifdef INET
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/netisr.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#include <netinet/if_ether.h>
#include "bpfilter.h"
#if NBPFILTER > 0
#include <net/bpf.h>
#include <net/bpfdesc.h>
#endif
#endif /* INET */
#define LPINITRDY 4 /* wait up to 4 seconds for a ready */
#define LPTOUTINITIAL 10 /* initial timeout to wait for ready 1/10 s */
#define LPTOUTMAX 1 /* maximal timeout 1 s */
#define LPPRI (PZERO+8)
#define BUFSIZE 1024
#ifdef INET
#ifndef LPMTU /* MTU for the lp# interfaces */
#define LPMTU 1500
#endif
#ifndef LPMAXSPIN1 /* DELAY factor for the lp# interfaces */
#define LPMAXSPIN1 8000 /* Spinning for remote intr to happen */
#endif
#ifndef LPMAXSPIN2 /* DELAY factor for the lp# interfaces */
#define LPMAXSPIN2 500 /* Spinning for remote handshake to happen */
#endif
#ifndef LPMAXERRS /* Max errors before !RUNNING */
#define LPMAXERRS 100
#endif
#define CLPIPHDRLEN 14 /* We send dummy ethernet addresses (two) + packet type in front of packet */
#define CLPIP_SHAKE 0x80 /* This bit toggles between nibble reception */
#define MLPIPHDRLEN CLPIPHDRLEN
#define LPIPHDRLEN 2 /* We send 0x08, 0x00 in front of packet */
#define LPIP_SHAKE 0x40 /* This bit toggles between nibble reception */
#if !defined(MLPIPHDRLEN) || LPIPHDRLEN > MLPIPHDRLEN
#define MLPIPHDRLEN LPIPHDRLEN
#endif
#define LPIPTBLSIZE 256 /* Size of octet translation table */
#endif /* INET */
/* 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)
static 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 */
u_char sc_backoff ; /* time to call lptout() again */
#ifdef INET
struct ifnet sc_if;
u_char *sc_ifbuf;
int sc_iferrs;
#endif
#ifdef DEVFS
void *devfs_token;
void *devfs_token_ctl;
#endif
} 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);
static int lptprobe (struct isa_device *dvp);
static int lptattach (struct isa_device *isdp);
#ifdef INET
/* Tables for the lp# interface */
static u_char *txmith;
#define txmitl (txmith+(1*LPIPTBLSIZE))
#define trecvh (txmith+(2*LPIPTBLSIZE))
#define trecvl (txmith+(3*LPIPTBLSIZE))
static u_char *ctxmith;
#define ctxmitl (ctxmith+(1*LPIPTBLSIZE))
#define ctrecvh (ctxmith+(2*LPIPTBLSIZE))
#define ctrecvl (ctxmith+(3*LPIPTBLSIZE))
/* Functions for the lp# interface */
static void lpattach(struct lpt_softc *,int);
static int lpinittables(void);
static int lpioctl(struct ifnet *, int, caddr_t);
static int lpoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
struct rtentry *);
static void lpintr(int);
#endif /* INET */
struct isa_driver lptdriver = {
lptprobe, lptattach, "lpt"
};
static d_open_t lptopen;
static d_close_t lptclose;
static d_write_t lptwrite;
static d_ioctl_t lptioctl;
#define CDEV_MAJOR 16
static struct cdevsw lpt_cdevsw =
{ lptopen, lptclose, noread, lptwrite, /*16*/
lptioctl, nullstop, nullreset, nodevtotty,/* lpt */
seltrue, nommap, nostrat, "lpt", NULL, -1 };
static struct kern_devconf kdc_lpt[NLPT] = { {
0, 0, 0, /* filled in by dev_attach */
"lpt", 0, { MDDT_ISA, 0, "tty" },
isa_generic_externalize, 0, 0, ISA_EXTERNALLEN,
&kdc_isa0, /* parent */
0, /* parentdata */
DC_UNCONFIGURED, /* state */
"Parallel printer adapter",
DC_CLS_PARALLEL | DC_CLS_NETIF /* class */
} };
static inline void
lpt_registerdev(struct isa_device *id)
{
if(id->id_unit)
kdc_lpt[id->id_unit] = kdc_lpt[0];
kdc_lpt[id->id_unit].kdc_unit = id->id_unit;
kdc_lpt[id->id_unit].kdc_isa = id;
dev_attach(&kdc_lpt[id->id_unit]);
}
/*
* 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;
lpt_registerdev(dvp);
/*
* 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;
int unit;
unit = isdp->id_unit;
sc = lpt_sc + 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", unit);
#ifdef INET
lpattach(sc, unit);
#endif
} else {
sc->sc_irq = 0;
lprintf("lpt%d: Polled port\n", unit);
}
lprintf("irq %x\n", sc->sc_irq);
kdc_lpt[unit].kdc_state = DC_IDLE;
#ifdef DEVFS
/* XXX what to do about the flags in the minor number? */
sc->devfs_token = devfs_add_devswf(&lpt_cdevsw,
unit, DV_CHR,
UID_ROOT, GID_WHEEL, 0600, "lpt%d", unit);
sc->devfs_token_ctl = devfs_add_devswf(&lpt_cdevsw,
unit | LP_BYPASS, DV_CHR,
UID_ROOT, GID_WHEEL, 0600, "lpctl%d", unit);
#endif
return (1);
}
/*
* lptopen -- reset the printer, then wait until it's selected and not busy.
* If LP_BYPASS flag is selected, then we do not try to select the
* printer -- this is just used for passing ioctls.
*/
static int
lptopen (dev_t dev, int flags, int fmt, struct proc *p)
{
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);
#ifdef INET
if (sc->sc_if.if_flags & IFF_UP)
return(EBUSY);
#endif
if (sc->sc_state) {
lprintf("lp: still open %x\n", sc->sc_state);
return(EBUSY);
} else
sc->sc_state |= INIT;
sc->sc_flags = LPTFLAGS(minor(dev));
/* Check for open with BYPASS flag set. */
if (sc->sc_flags & LP_BYPASS) {
sc->sc_state = OPEN;
return(0);
}
s = spltty();
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;
kdc_lpt[unit].kdc_state = DC_BUSY;
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,
(sc->sc_backoff = hz/LPTOUTINITIAL));
}
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) {
sc->sc_backoff++;
if (sc->sc_backoff > hz/LPTOUTMAX)
sc->sc_backoff = sc->sc_backoff > hz/LPTOUTMAX;
timeout ((timeout_func_t)lptout, (caddr_t)sc, sc->sc_backoff);
} 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.
*/
static int
lptclose(dev_t dev, int flags, int fmt, struct proc *p)
{
struct lpt_softc *sc = lpt_sc + LPTUNIT(minor(dev));
int port = sc->sc_port;
if(sc->sc_flags & LP_BYPASS)
goto end_close;
sc->sc_state &= ~OPEN;
kdc_lpt[minor(dev)].kdc_state = DC_IDLE;
/* 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;
outb(sc->sc_port+lpt_control, LPC_NINIT);
brelse(sc->sc_inbuf);
end_close:
sc->sc_state = 0;
sc->sc_xfercnt = 0;
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.
*/
static int
lptwrite(dev_t dev, struct uio * uio, int ioflag)
{
register unsigned n;
int pl, err;
struct lpt_softc *sc = lpt_sc + LPTUNIT(minor(dev));
if(sc->sc_flags & LP_BYPASS) {
/* we can't do writes in bypass mode */
return(EPERM);
}
sc->sc_state &= ~INTERRUPTED;
while ((n = min(BUFSIZE, uio->uio_resid)) != 0) {
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;
int i;
#ifdef INET
if(sc->sc_if.if_flags & IFF_UP) {
lpintr(unit);
return;
}
#endif /* INET */
/*
* Is printer online and ready for output?
*
* Avoid falling back to lptout() too quickly. First spin-loop
* to see if the printer will become ready ``really soon now''.
*/
for (i = 0;
i < 100 &&
((sts=inb(port+lpt_status)) & RDY_MASK) != LP_READY;
i++) ;
if ((sts & RDY_MASK) == LP_READY) {
sc->sc_state = (sc->sc_state | OBUSY) & ~ERROR;
sc->sc_backoff = hz/LPTOUTINITIAL;
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;
/* lptout() will jump in and try to restart. */
}
lprintf("sts %x ", sts);
}
static int
lptioctl(dev_t dev, int cmd, caddr_t data, int flags, struct proc *p)
{
int error = 0;
struct lpt_softc *sc;
u_int unit = LPTUNIT(minor(dev));
u_char old_sc_irq; /* old printer IRQ status */
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 interrupt status changes,
* this gets syslog'd.
*/
old_sc_irq = sc->sc_irq;
if(*(int*)data == 0)
sc->sc_irq &= (~LP_ENABLE_IRQ);
else
sc->sc_irq |= LP_ENABLE_IRQ;
if (old_sc_irq != sc->sc_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);
}
#ifdef INET
static void
lpattach (struct lpt_softc *sc, int unit)
{
struct ifnet *ifp = &sc->sc_if;
ifp->if_softc = sc;
ifp->if_name = "lp";
ifp->if_unit = unit;
ifp->if_mtu = LPMTU;
ifp->if_flags = IFF_SIMPLEX | IFF_POINTOPOINT | IFF_MULTICAST;
ifp->if_ioctl = lpioctl;
ifp->if_output = lpoutput;
ifp->if_type = IFT_PARA;
ifp->if_hdrlen = 0;
ifp->if_addrlen = 0;
ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
if_attach(ifp);
printf("lp%d: TCP/IP capable interface\n", unit);
#if NBPFILTER > 0
bpfattach(ifp, DLT_NULL, LPIPHDRLEN);
#endif
}
/*
* Build the translation tables for the LPIP (BSD unix) protocol.
* We don't want to calculate these nasties in our tight loop, so we
* precalculate them when we initialize.
*/
static int
lpinittables (void)
{
int i;
if (!txmith)
txmith = malloc(4*LPIPTBLSIZE, M_DEVBUF, M_NOWAIT);
if (!txmith)
return 1;
if (!ctxmith)
ctxmith = malloc(4*LPIPTBLSIZE, M_DEVBUF, M_NOWAIT);
if (!ctxmith)
return 1;
for (i=0; i < LPIPTBLSIZE; i++) {
ctxmith[i] = (i & 0xF0) >> 4;
ctxmitl[i] = 0x10 | (i & 0x0F);
ctrecvh[i] = (i & 0x78) << 1;
ctrecvl[i] = (i & 0x78) >> 3;
}
for (i=0; i < LPIPTBLSIZE; i++) {
txmith[i] = ((i & 0x80) >> 3) | ((i & 0x70) >> 4) | 0x08;
txmitl[i] = ((i & 0x08) << 1) | (i & 0x07);
trecvh[i] = ((~i) & 0x80) | ((i & 0x38) << 1);
trecvl[i] = (((~i) & 0x80) >> 4) | ((i & 0x38) >> 3);
}
return 0;
}
/*
* Process an ioctl request.
*/
static int
lpioctl (struct ifnet *ifp, int cmd, caddr_t data)
{
struct lpt_softc *sc = lpt_sc + ifp->if_unit;
struct ifaddr *ifa = (struct ifaddr *)data;
struct ifreq *ifr = (struct ifreq *)data;
u_char *ptr;
switch (cmd) {
case SIOCSIFDSTADDR:
case SIOCAIFADDR:
case SIOCSIFADDR:
if (ifa->ifa_addr->sa_family != AF_INET)
return EAFNOSUPPORT;
ifp->if_flags |= IFF_UP;
/* FALLTHROUGH */
case SIOCSIFFLAGS:
if ((!(ifp->if_flags & IFF_UP)) && (ifp->if_flags & IFF_RUNNING)) {
outb(sc->sc_port + lpt_control, 0x00);
ifp->if_flags &= ~IFF_RUNNING;
break;
}
if (((ifp->if_flags & IFF_UP)) && (!(ifp->if_flags & IFF_RUNNING))) {
if (lpinittables())
return ENOBUFS;
sc->sc_ifbuf = malloc(sc->sc_if.if_mtu + MLPIPHDRLEN,
M_DEVBUF, M_WAITOK);
if (!sc->sc_ifbuf)
return ENOBUFS;
outb(sc->sc_port + lpt_control, LPC_ENA);
ifp->if_flags |= IFF_RUNNING;
}
break;
case SIOCSIFMTU:
ptr = sc->sc_ifbuf;
sc->sc_ifbuf = malloc(ifr->ifr_mtu+MLPIPHDRLEN, M_DEVBUF, M_NOWAIT);
if (!sc->sc_ifbuf) {
sc->sc_ifbuf = ptr;
return ENOBUFS;
}
if (ptr)
free(ptr,M_DEVBUF);
sc->sc_if.if_mtu = ifr->ifr_mtu;
break;
case SIOCGIFMTU:
ifr->ifr_mtu = sc->sc_if.if_mtu;
break;
case SIOCADDMULTI:
case SIOCDELMULTI:
if (ifr == 0) {
return EAFNOSUPPORT; /* XXX */
}
switch (ifr->ifr_addr.sa_family) {
#ifdef INET
case AF_INET:
break;
#endif
default:
return EAFNOSUPPORT;
}
break;
default:
lprintf("LP:ioctl(0x%x)\n",cmd);
return EINVAL;
}
return 0;
}
static inline int
clpoutbyte (u_char byte, int spin, int data_port, int status_port)
{
outb(data_port, ctxmitl[byte]);
while (inb(status_port) & CLPIP_SHAKE)
if (--spin == 0) {
return 1;
}
outb(data_port, ctxmith[byte]);
while (!(inb(status_port) & CLPIP_SHAKE))
if (--spin == 0) {
return 1;
}
return 0;
}
static inline int
clpinbyte (int spin, int data_port, int status_port)
{
int c, cl;
while((inb(status_port) & CLPIP_SHAKE))
if(!--spin) {
return -1;
}
cl = inb(status_port);
outb(data_port, 0x10);
while(!(inb(status_port) & CLPIP_SHAKE))
if(!--spin) {
return -1;
}
c = inb(status_port);
outb(data_port, 0x00);
return (ctrecvl[cl] | ctrecvh[c]);
}
static void
lpintr (int unit)
{
struct lpt_softc *sc = lpt_sc + unit;
register int lpt_data_port = sc->sc_port + lpt_data;
register int lpt_stat_port = sc->sc_port + lpt_status;
int lpt_ctrl_port = sc->sc_port + lpt_control;
int len, s, j;
u_char *bp;
u_char c, cl;
struct mbuf *top;
s = splhigh();
if (sc->sc_if.if_flags & IFF_LINK0) {
/* Ack. the request */
outb(lpt_data_port, 0x01);
/* Get the packet length */
j = clpinbyte(LPMAXSPIN2, lpt_data_port, lpt_stat_port);
if (j == -1)
goto err;
len = j;
j = clpinbyte(LPMAXSPIN2, lpt_data_port, lpt_stat_port);
if (j == -1)
goto err;
len = len + (j << 8);
if (len > sc->sc_if.if_mtu + MLPIPHDRLEN)
goto err;
bp = sc->sc_ifbuf;
while (len--) {
j = clpinbyte(LPMAXSPIN2, lpt_data_port, lpt_stat_port);
if (j == -1) {
goto err;
}
*bp++ = j;
}
/* Get and ignore checksum */
j = clpinbyte(LPMAXSPIN2, lpt_data_port, lpt_stat_port);
if (j == -1) {
goto err;
}
len = bp - sc->sc_ifbuf;
if (len <= CLPIPHDRLEN)
goto err;
sc->sc_iferrs = 0;
if (IF_QFULL(&ipintrq)) {
lprintf("DROP");
IF_DROP(&ipintrq);
goto done;
}
len -= CLPIPHDRLEN;
sc->sc_if.if_ipackets++;
sc->sc_if.if_ibytes += len;
top = m_devget(sc->sc_ifbuf + CLPIPHDRLEN, len, 0, &sc->sc_if, 0);
if (top) {
IF_ENQUEUE(&ipintrq, top);
schednetisr(NETISR_IP);
}
goto done;
}
while ((inb(lpt_stat_port) & LPIP_SHAKE)) {
len = sc->sc_if.if_mtu + LPIPHDRLEN;
bp = sc->sc_ifbuf;
while (len--) {
cl = inb(lpt_stat_port);
outb(lpt_data_port, 8);
j = LPMAXSPIN2;
while((inb(lpt_stat_port) & LPIP_SHAKE))
if(!--j) goto err;
c = inb(lpt_stat_port);
outb(lpt_data_port, 0);
*bp++= trecvh[cl] | trecvl[c];
j = LPMAXSPIN2;
while (!((cl=inb(lpt_stat_port)) & LPIP_SHAKE)) {
if (cl != c &&
(((cl = inb(lpt_stat_port)) ^ 0xb8) & 0xf8) ==
(c & 0xf8))
goto end;
if (!--j) goto err;
}
}
end:
len = bp - sc->sc_ifbuf;
if (len <= LPIPHDRLEN)
goto err;
sc->sc_iferrs = 0;
if (IF_QFULL(&ipintrq)) {
lprintf("DROP");
IF_DROP(&ipintrq);
goto done;
}
#if NBPFILTER > 0
if (sc->sc_if.if_bpf) {
bpf_tap(&sc->sc_if, sc->sc_ifbuf, len);
}
#endif
len -= LPIPHDRLEN;
sc->sc_if.if_ipackets++;
sc->sc_if.if_ibytes += len;
top = m_devget(sc->sc_ifbuf + LPIPHDRLEN, len, 0, &sc->sc_if, 0);
if (top) {
IF_ENQUEUE(&ipintrq, top);
schednetisr(NETISR_IP);
}
}
goto done;
err:
outb(lpt_data_port, 0);
lprintf("R");
sc->sc_if.if_ierrors++;
sc->sc_iferrs++;
/*
* We are not able to send receive anything for now,
* so stop wasting our time
*/
if (sc->sc_iferrs > LPMAXERRS) {
printf("lp%d: Too many errors, Going off-line.\n", unit);
outb(lpt_ctrl_port, 0x00);
sc->sc_if.if_flags &= ~IFF_RUNNING;
sc->sc_iferrs=0;
}
done:
splx(s);
return;
}
static inline int
lpoutbyte (u_char byte, int spin, int data_port, int status_port)
{
outb(data_port, txmith[byte]);
while (!(inb(status_port) & LPIP_SHAKE))
if (--spin == 0)
return 1;
outb(data_port, txmitl[byte]);
while (inb(status_port) & LPIP_SHAKE)
if (--spin == 0)
return 1;
return 0;
}
static int
lpoutput (struct ifnet *ifp, struct mbuf *m,
struct sockaddr *dst, struct rtentry *rt)
{
register int lpt_data_port = lpt_sc[ifp->if_unit].sc_port + lpt_data;
register int lpt_stat_port = lpt_sc[ifp->if_unit].sc_port + lpt_status;
int lpt_ctrl_port = lpt_sc[ifp->if_unit].sc_port + lpt_control;
int s, err;
struct mbuf *mm;
u_char *cp = "\0\0";
u_char chksum = 0;
int count = 0;
int i;
int spin;
/* We need a sensible value if we abort */
cp++;
ifp->if_flags |= IFF_RUNNING;
err = 1; /* assume we're aborting because of an error */
s = splhigh();
/* Suspend (on laptops) or receive-errors might have taken us offline */
outb(lpt_ctrl_port, LPC_ENA);
if (ifp->if_flags & IFF_LINK0) {
if (!(inb(lpt_stat_port) & CLPIP_SHAKE)) {
lprintf("&");
lptintr(ifp->if_unit);
}
/* Alert other end to pending packet */
spin = LPMAXSPIN1;
outb(lpt_data_port, 0x08);
while ((inb(lpt_stat_port) & 0x08) == 0)
if (--spin == 0) {
goto nend;
}
/* Calculate length of packet, then send that */
count += 14; /* Ethernet header len */
mm = m;
for (mm = m; mm; mm = mm->m_next) {
count += mm->m_len;
}
if (clpoutbyte(count & 0xFF, LPMAXSPIN1, lpt_data_port, lpt_stat_port))
goto nend;
if (clpoutbyte((count >> 8) & 0xFF, LPMAXSPIN1, lpt_data_port, lpt_stat_port))
goto nend;
/* Send dummy ethernet header */
for (i = 0; i < 12; i++) {
if (clpoutbyte(i, LPMAXSPIN1, lpt_data_port, lpt_stat_port))
goto nend;
chksum += i;
}
if (clpoutbyte(0x08, LPMAXSPIN1, lpt_data_port, lpt_stat_port))
goto nend;
if (clpoutbyte(0x00, LPMAXSPIN1, lpt_data_port, lpt_stat_port))
goto nend;
chksum += 0x08 + 0x00; /* Add into checksum */
mm = m;
do {
cp = mtod(mm, u_char *);
while (mm->m_len--) {
chksum += *cp;
if (clpoutbyte(*cp++, LPMAXSPIN2, lpt_data_port, lpt_stat_port))
goto nend;
}
} while ((mm = mm->m_next));
/* Send checksum */
if (clpoutbyte(chksum, LPMAXSPIN2, lpt_data_port, lpt_stat_port))
goto nend;
/* Go quiescent */
outb(lpt_data_port, 0);
err = 0; /* No errors */
nend:
if (err) { /* if we didn't timeout... */
ifp->if_oerrors++;
lprintf("X");
} else {
ifp->if_opackets++;
ifp->if_obytes += m->m_pkthdr.len;
}
m_freem(m);
if (!(inb(lpt_stat_port) & CLPIP_SHAKE)) {
lprintf("^");
lptintr(ifp->if_unit);
}
(void) splx(s);
return 0;
}
if (inb(lpt_stat_port) & LPIP_SHAKE) {
lprintf("&");
lptintr(ifp->if_unit);
}
if (lpoutbyte(0x08, LPMAXSPIN1, lpt_data_port, lpt_stat_port))
goto end;
if (lpoutbyte(0x00, LPMAXSPIN2, lpt_data_port, lpt_stat_port))
goto end;
mm = m;
do {
cp = mtod(mm,u_char *);
while (mm->m_len--)
if (lpoutbyte(*cp++, LPMAXSPIN2, lpt_data_port, lpt_stat_port))
goto end;
} while ((mm = mm->m_next));
err = 0; /* no errors were encountered */
end:
--cp;
outb(lpt_data_port, txmitl[*cp] ^ 0x17);
if (err) { /* if we didn't timeout... */
ifp->if_oerrors++;
lprintf("X");
} else {
ifp->if_opackets++;
ifp->if_obytes += m->m_pkthdr.len;
#if NBPFILTER > 0
if (ifp->if_bpf) {
/*
* We need to prepend the packet type as
* a two byte field. Cons up a dummy header
* to pacify bpf. This is safe because bpf
* will only read from the mbuf (i.e., it won't
* try to free it or keep a pointer to it).
*/
struct mbuf m0;
u_short hdr = 0x800;
m0.m_next = m;
m0.m_len = 2;
m0.m_data = (char *)&hdr;
bpf_mtap(ifp, &m0);
}
#endif
}
m_freem(m);
if (inb(lpt_stat_port) & LPIP_SHAKE) {
lprintf("^");
lptintr(ifp->if_unit);
}
(void) splx(s);
return 0;
}
#endif /* INET */
static lpt_devsw_installed = 0;
static void lpt_drvinit(void *unused)
{
dev_t dev;
if( ! lpt_devsw_installed ) {
dev = makedev(CDEV_MAJOR, 0);
cdevsw_add(&dev,&lpt_cdevsw, NULL);
lpt_devsw_installed = 1;
}
}
SYSINIT(lptdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,lpt_drvinit,NULL)
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