lpt.c

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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 1.30.4.9 1996/04/15 17:14:12 joerg 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 <[e-mail]>
 */

#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 /* ENDIF */
#ifdef	DEVFS
	void	*devfs_token;
#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"
};

d_open_t	lptopen;
d_close_t	lptclose;
d_write_t	lptwrite;
d_ioctl_t	lptioctl;
void		lptintr(int unit);

#define CDEV_MAJOR 16
#if 0
static struct cdevsw lpt_cdevsw = 
	{ lptopen,	lptclose,	noread,		lptwrite,	/*16*/
	  lptioctl,	nullstop,	nullreset,	nodevtotty,/* lpt */
	  seltrue,	nommap,		nostrat,	"lpt",	NULL,	-1 };
#endif

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;
	char	name[32];

	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);