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
 *	From Id: lpt.c,v 1.55.2.1 1996/11/12 09:08:38 phk Exp
 *	From Id: nlpt.c,v 1.14 1999/02/08 13:55:43 des Exp
 *	$Id: lpt.c,v 1.2.2.1 1999/04/24 02:20:22 obrien Exp $
 */

/*
 * Device Driver for AT parallel printer port
 * Written by William Jolitz 12/18/90
 */

/*
 * Updated for ppbus by Nicolas Souchu
 * [Mon Jul 28 1997]
 */


#ifdef KERNEL
#include "opt_devfs.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/buf.h>
#include <sys/kernel.h>
#include <sys/uio.h>
#include <sys/syslog.h>
#ifdef DEVFS
#include <sys/devfsext.h>
#endif /*DEVFS*/
#include <sys/malloc.h>

#include <machine/clock.h>
#include <machine/lpt.h>
#endif /*KERNEL*/

#include <dev/ppbus/ppbconf.h>
#include <dev/ppbus/ppb_1284.h>
#include <dev/ppbus/lpt.h>

#include "opt_lpt.h"

#ifndef LPT_DEBUG
#define lprintf(args)
#else
#define lprintf(args)						\
		do {						\
			if (lptflag)				\
				printf args;			\
		} while (0)
static int volatile lptflag = 1;
#endif

#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
#define	BUFSTATSIZE	32

#define	LPTUNIT(s)	((s)&0x03)
#define	LPTFLAGS(s)	((s)&0xfc)

struct lpt_data {
	unsigned short lpt_unit;

	struct ppb_device lpt_dev;

	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;
	struct	buf *sc_statbuf;
	short	sc_xfercnt ;
	char	sc_primed;
	char	*sc_cp ;
	u_short	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 */
#define LP_ENABLE_EXT	0x10	/* we shall use advanced mode when possible */
	u_char	sc_backoff ;	/* time to call lptout() again */

#ifdef DEVFS
	void	*devfs_token;
	void	*devfs_token_ctl;
#endif
};

static int	nlpt = 0;
#define MAXLPT	8			/* XXX not much better! */
static struct lpt_data *lptdata[MAXLPT];

#define LPT_NAME	"lpt"		/* our official name */

static timeout_t lptout;
static int	lpt_port_test(struct lpt_data *sc, u_char data, u_char mask);
static int	lpt_detect(struct lpt_data *sc);

/*
 * Make ourselves visible as a ppbus driver
 */

static struct ppb_device	*lptprobe(struct ppb_data *ppb);
static int			lptattach(struct ppb_device *dev);
static void			lptintr(int unit);
static void			lpt_drvinit(void *unused);

static void			lpt_intr(int unit);	/* without spls */

#ifdef KERNEL

static struct ppb_driver lptdriver = {
    lptprobe, lptattach, LPT_NAME
};
DATA_SET(ppbdriver_set, lptdriver);

#endif /* KERNEL */

/* bits for state */
#define	OPEN		(1<<0)	/* device is open */
#define	ASLP		(1<<1)	/* awaiting draining of printer */
#define	EERROR		(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 LPTINIT		(1<<6)	/* waiting to initialize for open */
#define INTERRUPTED	(1<<7)	/* write call was interrupted */

#define HAVEBUS		(1<<8)	/* the driver owns the bus */


/* 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(lpt)	((ppb_rstr(&(lpt)->lpt_dev)^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	d_open_t	lptopen;
static	d_close_t	lptclose;
static	d_write_t	lptwrite;
static	d_read_t	lptread;
static	d_ioctl_t	lptioctl;

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

static int
lpt_request_ppbus(struct lpt_data *sc, int how)
{
	int error;

	if (sc->sc_state & HAVEBUS)
		return (0);

	/* we have the bus only if the request succeded */
	if ((error = ppb_request_bus(&sc->lpt_dev, how)) == 0)
		sc->sc_state |= HAVEBUS;

	return (error);
}

static int
lpt_release_ppbus(struct lpt_data *sc)
{
	ppb_release_bus(&sc->lpt_dev);
	sc->sc_state &= ~HAVEBUS;

	return (0);
}

/*
 * Internal routine to lptprobe to do port tests of one byte value
 */
static int
lpt_port_test(struct lpt_data *sc, u_char data, u_char mask)
{
	int	temp, timeout;

	data = data & mask;
	ppb_wdtr(&sc->lpt_dev, data);
	timeout = 10000;
	do {
		DELAY(10);
		temp = ppb_rdtr(&sc->lpt_dev) & mask;
	}
	while (temp != data && --timeout);
	lprintf(("out=%x\tin=%x\ttout=%d\n", data, temp, timeout));
	return (temp == data);
}

/*
 * Probe simplified by replacing multiple loops with a hardcoded
 * test pattern - 1999/02/08 [e-mail]
 *
 * 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.
 */
static int
lpt_detect(struct lpt_data *sc)
{
	static u_char	testbyte[18] = {
		0x55,			/* alternating zeros */
		0xaa,			/* alternating ones */
		0xfe, 0xfd, 0xfb, 0xf7,
		0xef, 0xdf, 0xbf, 0x7f,	/* walking zero */
		0x01, 0x02, 0x04, 0x08,
		0x10, 0x20, 0x40, 0x80	/* walking one */
	};
	int		i, error, status;

	status = 1;				/* assume success */

	if ((error = lpt_request_ppbus(sc, PPB_DONTWAIT))) {
		printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error);
		status = 0;
		goto end_probe;
	}

	for (i = 0; i < 18 && status; i++)
		if (!lpt_port_test(sc, testbyte[i], 0xff)) {
			status = 0;
			goto end_probe;
		}

end_probe:
	/* write 0's to control and data ports */
	ppb_wdtr(&sc->lpt_dev, 0);
	ppb_wctr(&sc->lpt_dev, 0);

	lpt_release_ppbus(sc);

	return (status);
}

/*
 * lptprobe()
 */
static struct ppb_device *
lptprobe(struct ppb_data *ppb)
{
	struct lpt_data *sc;

	sc = (struct lpt_data *) malloc(sizeof(struct lpt_data),
							M_TEMP, M_NOWAIT);
	if (!sc) {
		printf(LPT_NAME ": cannot malloc!\n");
		return (0);
	}
	bzero(sc, sizeof(struct lpt_data));

	lptdata[nlpt] = sc;

	/*
	 * lpt dependent initialisation.
	 */
	sc->lpt_unit = nlpt;

	/*
	 * ppbus dependent initialisation.
	 */
	sc->lpt_dev.id_unit = sc->lpt_unit;
	sc->lpt_dev.name = lptdriver.name;
	sc->lpt_dev.ppb = ppb;
	sc->lpt_dev.intr = lptintr;

	/*
	 * Now, try to detect the printer.
	 */
	if (!lpt_detect(sc)) {
		free(sc, M_TEMP);
		return (0);
	}

	/* Ok, go to next device on next probe */
	nlpt ++;

	return (&sc->lpt_dev);
}

static int
lptattach(struct ppb_device *dev)
{
	struct lpt_data *sc = lptdata[dev->id_unit];
	int error;

	/*
	 * Report ourselves
	 */
	printf(LPT_NAME "%d: <generic printer> on ppbus %d\n",
	       dev->id_unit, dev->ppb->ppb_link->adapter_unit);

	sc->sc_primed = 0;	/* not primed yet */

	if ((error = lpt_request_ppbus(sc, PPB_DONTWAIT))) {
		printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error);
		return (0);
	}

	ppb_wctr(&sc->lpt_dev, LPC_NINIT);

	/* check if we can use interrupt, should be done by ppc stuff */
	lprintf(("oldirq %x\n", sc->sc_irq));
	if (ppb_get_irq(&sc->lpt_dev)) {
		sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ;
		printf(LPT_NAME "%d: Interrupt-driven port\n", dev->id_unit);
	} else {
		sc->sc_irq = 0;
		lprintf((LPT_NAME "%d: Polled port\n", dev->id_unit));
	}
	lprintf(("irq %x\n", sc->sc_irq));

	lpt_release_ppbus(sc);

#ifdef DEVFS
	sc->devfs_token = devfs_add_devswf(&lpt_cdevsw,
		dev->id_unit, DV_CHR,
		UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d", dev->id_unit);
	sc->devfs_token_ctl = devfs_add_devswf(&lpt_cdevsw,
		dev->id_unit | LP_BYPASS, DV_CHR,
		UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d.ctl", dev->id_unit);
#endif

	return (1);
}

static void
lptout(void *arg)
{
	struct lpt_data *sc = arg;
	int pl;

	lprintf(("T %x ", ppb_rstr(&sc->lpt_dev)));
	if (sc->sc_state & OPEN) {
		sc->sc_backoff++;
		if (sc->sc_backoff > hz/LPTOUTMAX)
			sc->sc_backoff = sc->sc_backoff > hz/LPTOUTMAX;
		timeout(lptout, (caddr_t)sc, sc->sc_backoff);
	} else
		sc->sc_state &= ~TOUT;

	if (sc->sc_state & EERROR)
		sc->sc_state &= ~EERROR;

	/*
	 * Avoid possible hangs do to missed interrupts
	 */
	if (sc->sc_xfercnt) {
		pl = spltty();
		lpt_intr(sc->lpt_unit);
		splx(pl);
	} else {
		sc->sc_state &= ~OBUSY;
		wakeup((caddr_t)sc);
	}
}

/*
 * 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_data *sc;

	int s;
	int trys, err;
	u_int unit = LPTUNIT(minor(dev));