/*	$OpenBSD: ac.c,v 1.7 1997/04/20 07:01:11 downsj Exp $	*/
/*	$NetBSD: ac.c,v 1.9 1997/04/02 22:37:21 scottr Exp $	*/

/*
 * Copyright (c) 1996, 1997 Jason R. Thorpe.  All rights reserved.
 * Copyright (c) 1991 University of Utah.
 * Copyright (c) 1990, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * the Systems Programming Group of the University of Utah Computer
 * Science Department.
 *
 * 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 product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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: Utah $Hdr: ac.c 1.5 92/01/21$
 *
 *	@(#)ac.c	8.2 (Berkeley) 1/12/94
 */

/*
 * SCSI driver for MO autochanger.
 *
 * Very crude.  Because of the lack of connect/disconnect support in the
 * scsi driver, this driver can tie up the SCSI bus for a long time.  It
 * also grabs a DMA channel and holds it for the duration even though it
 * never uses it.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/device.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/kernel.h>
#include <sys/malloc.h>

#include <hp300/dev/scsireg.h>
#include <hp300/dev/scsivar.h>
#include <hp300/dev/acioctl.h>
#include <hp300/dev/acvar.h>

/* cdev_decl(ac); */
/* XXX we should use macros to do these... */
int	acopen __P((dev_t, int, int, struct proc *));
int	acclose __P((dev_t, int, int, struct proc *));
int	acioctl __P((dev_t, u_long, caddr_t, int, struct proc *));

static int	acmatch __P((struct device *, void *, void *));
static void	acattach __P((struct device *, struct device *, void *));

struct cfattach ac_ca = {
	sizeof(struct ac_softc), acmatch, acattach
};

struct cfdriver ac_cd = {
	NULL, "ac", DV_DULL
};

void	acstart __P((void *));
void	acgo __P((void *));
void	acintr __P((void *, int));

#ifdef DEBUG
int ac_debug = 0x0000;
#define ACD_FOLLOW	0x0001
#define ACD_OPEN	0x0002
#endif

static int
acmatch(parent, match, aux)
	struct device *parent;
	void *match, *aux;
{
	struct oscsi_attach_args *osa = aux;

	if (osa->osa_inqbuf->type != 8 || osa->osa_inqbuf->qual != 0x80 ||
	    osa->osa_inqbuf->version != 2)
		return (0);

	return (1);
}

static void
acattach(parent, self, aux)
	struct device *parent, *self;
	void *aux;
{
	struct ac_softc *sc = (struct ac_softc *)self;
	struct oscsi_attach_args *osa = aux;

	printf("\n");

	sc->sc_target = osa->osa_target;
	sc->sc_lun = osa->osa_lun;

	/* Initialize SCSI queue entry. */
	sc->sc_sq.sq_softc = sc;
	sc->sc_sq.sq_target = sc->sc_target;
	sc->sc_sq.sq_lun = sc->sc_lun;
	sc->sc_sq.sq_start = acstart;
	sc->sc_sq.sq_go = acgo;
	sc->sc_sq.sq_intr = acintr;

	sc->sc_bp = (struct buf *)malloc(sizeof(struct buf),
	    M_DEVBUF, M_NOWAIT);
	sc->sc_cmd = (struct scsi_fmt_cdb *)malloc(sizeof(struct scsi_fmt_cdb),
	    M_DEVBUF, M_NOWAIT);

	if (sc->sc_bp == NULL || sc->sc_cmd == NULL) {
		printf("%s: memory allocation failed\n", sc->sc_dev.dv_xname);
		return;
	}

	sc->sc_flags = ACF_ALIVE;
}

/*ARGSUSED*/
int
acopen(dev, flag, mode, p)
	dev_t dev;
	int flag, mode;
	struct proc *p;
{
	int unit = minor(dev);
	struct ac_softc *sc;

	if (unit >= ac_cd.cd_ndevs ||
	    (sc = ac_cd.cd_devs[unit]) == NULL ||
	    (sc->sc_flags & ACF_ALIVE) == 0)
		return (ENXIO);

	if (sc->sc_flags & ACF_OPEN)
		return (EBUSY);

	/*
	 * Since acgeteinfo can block we mark the changer open now.
	 */
	sc->sc_flags |= ACF_OPEN;
	if (acgeteinfo(dev)) {
		sc->sc_flags &= ~ACF_OPEN;
		return(EIO);
	}
	return (0);
}

/*ARGSUSED*/
int
acclose(dev, flag, mode, p)
	dev_t dev;
	int flag, mode;
	struct proc *p;
{
	struct ac_softc *sc = ac_cd.cd_devs[minor(dev)];

	sc->sc_flags &= ~ACF_OPEN;
	return (0);
}

#define ACRESLEN(ep)	\
	(8 + (ep)->nmte*12 + (ep)->nse*12 + (ep)->niee*12 + (ep)->ndte*20)

/*ARGSUSED*/
int
acioctl(dev, cmd, data, flag, p)
	dev_t dev;
	u_long cmd;
	caddr_t data; 
	int flag;
	struct proc *p;
{
	struct ac_softc *sc = ac_cd.cd_devs[minor(dev)];
	char *dp;
	int dlen, error = 0;

	switch (cmd) {

	default:
		return (EINVAL);

	/* perform an init element status and mode sense to reset state */
	case ACIOCINIT:
		error = accommand(dev, ACCMD_INITES, (caddr_t)0, 0);
		if (!error)
			error = acgeteinfo(dev);
		break;

	/* copy internal element information */
	case ACIOCGINFO:
		*(struct acinfo *)data = sc->sc_einfo;
		break;

	case ACIOCRAWES:
	{
		struct acbuffer *acbp = (struct acbuffer *)data;

		dlen = ACRESLEN(&sc->sc_einfo);
		dp = (char *) malloc(dlen, M_DEVBUF, M_WAITOK);
		error = accommand(dev, ACCMD_READES, dp, dlen);
		if (!error) {
			dlen = *(int *)&dp[4] + 8;
			if (dlen > acbp->buflen)
				dlen = acbp->buflen;
			error = copyout(dp, acbp->bufptr, dlen);
		}
		break;
	}

	case ACIOCGSTAT:
	{
		struct acbuffer *acbp = (struct acbuffer *)data;

		dlen = ACRESLEN(&sc->sc_einfo);
		dp = (char *) malloc(dlen, M_DEVBUF, M_WAITOK);
		error = accommand(dev, ACCMD_READES, dp, dlen);
		if (!error) {
			int ne;
			char *tbuf;

			ne = sc->sc_einfo.nmte + sc->sc_einfo.nse +
				sc->sc_einfo.niee + sc->sc_einfo.ndte;
			dlen = ne * sizeof(struct aceltstat);
			tbuf = (char *) malloc(dlen, M_DEVBUF, M_WAITOK);
			acconvert(dp, tbuf, ne);
			if (dlen > acbp->buflen)
				dlen = acbp->buflen;
			error = copyout(tbuf, acbp->bufptr, dlen);
			free(tbuf, M_DEVBUF);
		}
		free(dp, M_DEVBUF);
		break;
	}

	case ACIOCMOVE:
		error = accommand(dev, ACCMD_MOVEM, data,
				  sizeof(struct acmove));
		break;
	}
	return(error);
}

int
accommand(dev, command, bufp, buflen)
	dev_t dev;
	int command;
	char *bufp;
	int buflen;
{
	int unit = minor(dev);
	struct ac_softc *sc = ac_cd.cd_devs[unit];
	struct buf *bp = sc->sc_bp;
	struct scsi_fmt_cdb *cmd = sc->sc_cmd;
	int error;

#ifdef DEBUG
	if (ac_debug & ACD_FOLLOW)
		printf("accommand(dev=%x, cmd=%x, buf=%p, buflen=%x)\n",
		       dev, command, bufp, buflen);
#endif
	if (sc->sc_flags & ACF_ACTIVE)
		panic("accommand: active!");

	sc->sc_flags |= ACF_ACTIVE;
	bzero((caddr_t)cmd->cdb, sizeof(cmd->cdb));
	cmd->cdb[0] = command;

	switch (command) {
	case ACCMD_INITES:
		cmd->len = 6;
		break;
	case ACCMD_READES:
		cmd->len = 12;
		*(short *)&cmd->cdb[2] = 0;
		*(short *)&cmd->cdb[4] =
			sc->sc_einfo.nmte + sc->sc_einfo.nse +
			sc->sc_einfo.niee + sc->sc_einfo.ndte;
		cmd->cdb[7] = buflen >> 16;
		cmd->cdb[8] = buflen >> 8;
		cmd->cdb[9] = buflen;
		break;
	case ACCMD_MODESENSE:
		cmd->len = 6;
		cmd->cdb[2] = 0x3F;	/* all pages */
		cmd->cdb[4] = buflen;
		break;
	case ACCMD_MOVEM:
		cmd->len = 12;
		*(short *)&cmd->cdb[2] = sc->sc_picker;
		*(short *)&cmd->cdb[4] = *(short *)&bufp[0];
		*(short *)&cmd->cdb[6] = *(short *)&bufp[2];
		if (*(short *)&bufp[4] & AC_INVERT)
			cmd->cdb[10] = 1;
		bufp = 0;
		buflen = 0;
		break;
	default:
		panic("accommand: bad command");
	}
	bp->b_flags = B_BUSY|B_READ;
	bp->b_dev = dev;
	bp->b_un.b_addr = bufp;
	bp->b_bcount = buflen;
	bp->b_resid = 0;
	bp->b_blkno = 0;
	bp->b_error = 0;
	if (scsireq(sc->sc_dev.dv_parent, &sc->sc_sq))
		acstart(sc);
	error = biowait(bp);
	sc->sc_flags &= ~ACF_ACTIVE;
	return (error);
}

void
acstart(arg)
	void *arg;
{
	struct ac_softc *sc = arg;

#ifdef DEBUG
	if (ac_debug & ACD_FOLLOW)
		printf("acstart(unit=%x)\n", sc->sc_dev.dv_unit);
#endif
	if (scsiustart(sc->sc_dev.dv_parent->dv_unit))
		acgo(arg);
}

void
acgo(arg)
	void *arg;
{
	struct ac_softc *sc = arg;
	struct buf *bp = sc->sc_bp;
	int stat;

#ifdef DEBUG
	if (ac_debug & ACD_FOLLOW)
		printf("acgo(unit=%x): ", sc->sc_dev.dv_unit);
#endif
	stat = scsigo(sc->sc_dev.dv_parent->dv_unit, sc->sc_target,
	    sc->sc_lun, bp, sc->sc_cmd, 0);
#ifdef DEBUG
	if (ac_debug & ACD_FOLLOW)
		printf("scsigo returns %x\n", stat);
#endif
	if (stat) {
		bp->b_error = EIO;
		bp->b_flags |= B_ERROR;
		(void) biodone(bp);
		scsifree(sc->sc_dev.dv_parent, &sc->sc_sq);
	}
}

void
acintr(arg, stat)
	void *arg;
	int stat;
{
	struct ac_softc *sc = arg;
	struct buf *bp = sc->sc_bp;
	u_char sensebuf[78];
	struct scsi_xsense *sp;

#ifdef DEBUG
	if (ac_debug & ACD_FOLLOW)
		printf("acintr(unit=%x, stat=%x)\n", sc->sc_dev.dv_unit, stat);
#endif
	switch (stat) {
	case 0:
		bp->b_resid = 0;
		break;
	case STS_CHECKCOND:
		scsi_request_sense(sc->sc_dev.dv_parent->dv_unit,
		    sc->sc_target, sc->sc_lun, sensebuf, sizeof sensebuf);
		sp = (struct scsi_xsense *)sensebuf;
		printf("%s: acintr sense key=%x, ac=%x, acq=%x\n",
		       sc->sc_dev.dv_xname, sp->key, sp->info4, sp->len);
		bp->b_flags |= B_ERROR;
		bp->b_error = EIO;
		break;
	default:
		printf("%s: acintr unknown status 0x%x\n", sc->sc_dev.dv_xname,
		    stat);
		break;
	}
	(void) biodone(sc->sc_bp);
	scsifree(sc->sc_dev.dv_parent, &sc->sc_sq);
}

int
acgeteinfo(dev)
	dev_t dev;
{
	struct ac_softc *sc = ac_cd.cd_devs[minor(dev)];
	char *bp;
	char msbuf[48];
	int error;

	bzero(msbuf, sizeof msbuf);
	error = accommand(dev, ACCMD_MODESENSE, msbuf, sizeof msbuf);
	if (error)
		return(error);
	bp = &msbuf[4];
	while (bp < &msbuf[48]) {
		switch (bp[0] & 0x3F) {
		case 0x1D:
			sc->sc_einfo = *(struct acinfo *)&bp[2];
			sc->sc_picker = sc->sc_einfo.fmte;	/* XXX */
			return(0);
		case 0x1E:
			bp += 4;
			break;
		case 0x1F:
			bp += 20;
			break;
		default:
			printf("acgeteinfo: bad page type %x\n", bp[0]);
			return(EIO);
		}
	}
	return(EIO);
}

void
acconvert(sbuf, dbuf, ne)
	char *sbuf, *dbuf;
	int ne;
{
	struct aceltstat *ep = (struct aceltstat *)dbuf;
	struct ac_restatphdr *phdr;
	struct ac_restatdb *dbp;
	struct ac_restathdr *hdr;
#ifdef DEBUG
	int bcount;
#endif

	hdr = (struct ac_restathdr *)&sbuf[0];
	sbuf += sizeof *hdr;
#ifdef DEBUG
	if (ac_debug & ACD_FOLLOW)
		printf("element status: first=%d, num=%d, len=%ld\n",
		       hdr->ac_felt, hdr->ac_nelt, hdr->ac_bcount);
	if (hdr->ac_nelt != ne) {
		printf("acconvert: # of elements, %d != %d\n",
		       hdr->ac_nelt, ne);
		if (hdr->ac_nelt < ne)
			ne = hdr->ac_nelt;
	}
	bcount = hdr->ac_bcount;
#endif
	while (ne) {
		phdr = (struct ac_restatphdr *)sbuf;
		sbuf += sizeof *phdr;
#ifdef DEBUG
		bcount -= sizeof *phdr;
#endif
		dbp = (struct ac_restatdb *)sbuf;
		sbuf += phdr->ac_bcount;
#ifdef DEBUG
		bcount -= phdr->ac_bcount;
#endif
		while (dbp < (struct ac_restatdb *)sbuf) {
			ep->type = phdr->ac_type;
			ep->eaddr = dbp->ac_eaddr;
			ep->flags = 0;
			if (dbp->ac_full)
				ep->flags |= AC_FULL;
			if (dbp->ac_exc)
				ep->flags |= AC_ERROR;
			if (dbp->ac_acc)
				ep->flags |= AC_ACCESS;
			dbp = (struct ac_restatdb *)
				((char *)dbp + phdr->ac_dlen);
			ep++;
			ne--;
		}
#ifdef DEBUG
		if (ne < 0 || bcount < 0)
			panic("acconvert: inconsistant");
#endif
	}
}