/*	$NetBSD: ofdisk.c,v 1.8 1997/10/08 23:35:41 thorpej Exp $	*/

/*
 * Copyright (C) 1995, 1996 Wolfgang Solfrank.
 * Copyright (C) 1995, 1996 TooLs GmbH.
 * 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 product includes software developed by TooLs GmbH.
 * 4. The name of TooLs GmbH may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``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 TOOLS GMBH 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.
 */

#include <sys/param.h>
#include <sys/buf.h>
#include <sys/device.h>
#include <sys/disklabel.h>
#include <sys/disk.h>
#include <sys/fcntl.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/systm.h>
#include <sys/proc.h>

#include <dev/ofw/openfirm.h>

struct ofd_softc {
	struct device sc_dev;
	int sc_phandle;
	int sc_unit;
	int sc_flags;
	struct disk sc_dk;
	int sc_ihandle;
	u_long max_transfer;
	char sc_name[16];
};

/* sc_flags */
#define OFDF_ISFLOPPY	0x01		/* we are a floppy drive */

static int ofdprobe __P((struct device *, struct cfdata *, void *));
static void ofdattach __P((struct device *, struct device *, void *));

struct cfattach ofdisk_ca = {
	sizeof(struct ofd_softc), ofdprobe, ofdattach
};

struct cfdriver ofdisk_cd = {
	NULL, "ofdisk", DV_DISK
};

void ofdstrategy __P((struct buf *));

struct dkdriver ofdkdriver = { ofdstrategy };

void ofdgetdefaultlabel __P((struct ofd_softc *, struct disklabel *));
void ofdgetdisklabel __P((dev_t));

static int
ofdprobe(parent, match, aux)
	struct device *parent;
	struct cfdata *match;
	void *aux;
{
	struct ofprobe *ofp = aux;
	char type[8];
	int l;
	
	if ((l = OF_getprop(ofp->phandle, "device_type", type,
	    sizeof type - 1)) < 0)
		return 0;
	if (l >= sizeof type)
		return 0;
	type[l] = 0;
	return !strcmp(type, "block");
}

static void
ofdattach(parent, self, aux)
	struct device *parent, *self;
	void *aux;
{
	struct ofd_softc *of = (void *)self;
	struct ofprobe *ofp = aux;
	char child[64];
	int l;

	if ((l = OF_getprop(ofp->phandle, "name", child,
	    sizeof child - 1)) < 0)
		panic("device without name?");
	if (l >= sizeof child)
		l = sizeof child - 1;
	child[l] = 0;

	of->sc_flags = 0;
	of->sc_phandle = ofp->phandle;
	of->sc_unit = ofp->unit;
	of->sc_ihandle = 0;
	of->sc_dk.dk_driver = &ofdkdriver;
	of->sc_dk.dk_name = of->sc_name;
	strcpy(of->sc_name, of->sc_dev.dv_xname);
	disk_attach(&of->sc_dk);
	dk_establish(&of->sc_dk, self);				/* XXX */
	printf("\n");

	if (strcmp(child, "floppy") == 0)
		of->sc_flags |= OFDF_ISFLOPPY;
}

int
ofdopen(dev, flags, fmt, p)
	dev_t dev;
	int flags;
	int fmt;
	struct proc *p;
{
	int unit = DISKUNIT(dev);
	struct ofd_softc *of;
	char path[256];
	struct disklabel *lp;
	int l;
	
	if (unit >= ofdisk_cd.cd_ndevs)
		return ENXIO;
	if (!(of = ofdisk_cd.cd_devs[unit]))
		return ENXIO;

	if (!of->sc_ihandle) {
		if ((l = OF_package_to_path(of->sc_phandle, path,
		    sizeof path - 3)) < 0)
			return ENXIO;
		if (l >= sizeof path - 3)
			return ENXIO;
		path[l] = 0;

		/*
		 * XXX This is for the benefit of SCSI/IDE disks that don't
		 * XXX have all their childs in the device tree.
		 * XXX YES, I DO THINK THIS IS A BUG IN OPENFIRMWARE!!!
		 * XXX And yes, this is a very gross hack!
		 * XXX See also ofscsi.c
		 */
		if (!strcmp(path + l - 4, "disk")) {
			path[l++] = '@';
			path[l++] = '0' + of->sc_unit;
			path[l] = 0;
		}

		strcat(path, ":0");

		if (!(of->sc_ihandle = OF_open(path)))
			return ENXIO;

		/*
		 * Try to get characteristics of the disk.
		 */
		of->max_transfer = OF_call_method_1("max-transfer",
		    of->sc_ihandle, 0);
		if (of->max_transfer > MAXPHYS)
			of->max_transfer = MAXPHYS;

		ofdgetdisklabel(dev);
	}

	switch (fmt) {
	case S_IFCHR:
		of->sc_dk.dk_copenmask |= 1 << DISKPART(dev);
		break;
	case S_IFBLK:
		of->sc_dk.dk_bopenmask |= 1 << DISKPART(dev);
		break;
	}
	of->sc_dk.dk_openmask =
	    of->sc_dk.dk_copenmask | of->sc_dk.dk_bopenmask;
	
	return 0;
}

int
ofdclose(dev, flags, fmt, p)
	dev_t dev;
	int flags;
	int fmt;
	struct proc *p;
{
	struct ofd_softc *of = ofdisk_cd.cd_devs[DISKUNIT(dev)];

	switch (fmt) {
	case S_IFCHR:
		of->sc_dk.dk_copenmask &= ~(1 << DISKPART(dev));
		break;
	case S_IFBLK:
		of->sc_dk.dk_bopenmask &= ~(1 << DISKPART(dev));
		break;
	}
	of->sc_dk.dk_openmask = of->sc_dk.dk_copenmask | of->sc_dk.dk_bopenmask;
	
#ifdef	FIRMWORKSBUGS
	/*
	 * This is a hack to get the firmware to flush its buffers.
	 */
	OF_seek(of->sc_ihandle, 0);
#endif
	if (!of->sc_dk.dk_openmask) {
		OF_close(of->sc_ihandle);
		of->sc_ihandle = 0;
	}

	return 0;
}

void
ofdstrategy(bp)
	struct buf *bp;
{
	struct ofd_softc *of = ofdisk_cd.cd_devs[DISKUNIT(bp->b_dev)];
	struct partition *p;
	u_quad_t off;
	int read;
	int (*OF_io)(int, void *, int);
	daddr_t blkno = bp->b_blkno;

	bp->b_resid = 0;
	if (bp->b_bcount == 0)
		goto done;
	
	OF_io = bp->b_flags & B_READ ? OF_read : OF_write;

	if (DISKPART(bp->b_dev) != RAW_PART) {
		if (bounds_check_with_label(bp, of->sc_dk.dk_label, 0) <= 0) {
			bp->b_resid = bp->b_bcount;
			goto done;
		}
		p = &of->sc_dk.dk_label->d_partitions[DISKPART(bp->b_dev)];
		blkno = bp->b_blkno + p->p_offset;
	}

	disk_busy(&of->sc_dk);

	off = (u_quad_t)blkno * DEV_BSIZE;
	read = -1;
	do {
		if (OF_seek(of->sc_ihandle, off) < 0)
			break;
		read = OF_io(of->sc_ihandle, bp->b_data, bp->b_bcount);
	} while (read == -2);

	if (read < 0) {
		bp->b_error = EIO;
		bp->b_flags |= B_ERROR;
		bp->b_resid = bp->b_bcount;
	} else
		bp->b_resid = bp->b_bcount - read;

	disk_unbusy(&of->sc_dk, bp->b_bcount - bp->b_resid);

done:
	biodone(bp);
}

static void
ofminphys(bp)
	struct buf *bp;
{
	struct ofd_softc *of = ofdisk_cd.cd_devs[DISKUNIT(bp->b_dev)];
	
	if (bp->b_bcount > of->max_transfer)
		bp->b_bcount = of->max_transfer;
}

int
ofdread(dev, uio)
	dev_t dev;
	struct uio *uio;
{
	return physio(ofdstrategy, NULL, dev, B_READ, ofminphys, uio);
}

int
ofdwrite(dev, uio)
	dev_t dev;
	struct uio *uio;
{
	return physio(ofdstrategy, NULL, dev, B_WRITE, ofminphys, uio);
}

int
ofdioctl(dev, cmd, data, flag, p)
	dev_t dev;
	u_long cmd;
	caddr_t data;
	int flag;
	struct proc *p;
{
	struct ofd_softc *of = ofdisk_cd.cd_devs[DISKUNIT(dev)];
	int error;
	
	switch (cmd) {
	case DIOCGDINFO:
		*(struct disklabel *)data = *of->sc_dk.dk_label;
		return 0;
		
	case DIOCGPART:
		((struct partinfo *)data)->disklab = of->sc_dk.dk_label;
		((struct partinfo *)data)->part =
			&of->sc_dk.dk_label->d_partitions[DISKPART(dev)];
		return 0;
		
	case DIOCWDINFO:
	case DIOCSDINFO:
		if ((flag & FWRITE) == 0)
			return EBADF;
		
		error = setdisklabel(of->sc_dk.dk_label,
		    (struct disklabel *)data, /*of->sc_dk.dk_openmask */0,
		    of->sc_dk.dk_cpulabel);
		if (error == 0 && cmd == DIOCWDINFO)
			error = writedisklabel(MAKEDISKDEV(major(dev),
			    DISKUNIT(dev), RAW_PART), ofdstrategy,
			    of->sc_dk.dk_label, of->sc_dk.dk_cpulabel);

		return error;

	case DIOCGDEFLABEL:
		ofdgetdefaultlabel(of, (struct disklabel *)data);
		return 0;

	default:
		return ENOTTY;
	}
}

int
ofddump(dev, blkno, va, size)
	dev_t dev;
	daddr_t blkno;
	caddr_t va;
	size_t size;
{
	return EINVAL;
}

int
ofdsize(dev)
	dev_t dev;
{
	struct ofd_softc *of;
	struct disklabel *lp;
	int size, part, omask, unit;

	unit = DISKUNIT(dev);
	if (unit >= ofdisk_cd.cd_ndevs ||
	    (of = ofdisk_cd.cd_devs[unit]) == NULL)
		return -1;

	part = DISKPART(dev);
	omask = of->sc_dk.dk_openmask & (1 << part);
	lp = of->sc_dk.dk_label;

	if (omask == 0 && ofdopen(dev, 0, S_IFBLK, curproc) != 0)
		return -1;

	if (lp->d_partitions[part].p_fstype != FS_SWAP)
		size = -1;
	else
		size = lp->d_partitions[part].p_size *
		    (lp->d_secsize / DEV_BSIZE);

	if (omask == 0 && ofdclose(dev, 0, S_IFBLK, curproc) != 0)
		return -1;

	return size;
}

void
ofdgetdefaultlabel(of, lp)
	struct ofd_softc *of;
	struct disklabel *lp;
{

	bzero(lp, sizeof *lp);

	/*
	 * XXX Firmware bug?  Asking for block size gives a
	 * XXX rediculous number!  So we use what the boot program
	 * XXX uses.
	 */
	lp->d_secsize = DEV_BSIZE;

	lp->d_secperunit = OF_call_method_1("#blocks",
	    of->sc_ihandle, 0);
	if (lp->d_secperunit == (u_int32_t)-1)
		lp->d_secperunit = 0x7fffffff;

	lp->d_secpercyl = 1;
	lp->d_nsectors = 1;
	lp->d_ntracks = 1;
	lp->d_ncylinders = lp->d_secperunit;

	lp->d_partitions[RAW_PART].p_offset = 0;
	lp->d_partitions[RAW_PART].p_size = lp->d_secperunit;
	lp->d_npartitions = RAW_PART + 1;

	lp->d_magic = DISKMAGIC;
	lp->d_magic2 = DISKMAGIC;
	lp->d_checksum = dkcksum(lp);
}

void
ofdgetdisklabel(dev)
	dev_t dev;
{
	int unit = DISKUNIT(dev);
	struct ofd_softc *of = ofdisk_cd.cd_devs[unit];
	struct disklabel *lp = of->sc_dk.dk_label;
	char *errmes;
	int l;

	ofdgetdefaultlabel(of, lp);

	/*
	 * Don't read the disklabel on a floppy; simply
	 * assign all partitions the same size/offset as
	 * RAW_PART.  (This is essentially what the ISA
	 * floppy driver does, but we don't deal with
	 * density stuff.)
	 */
	if (of->sc_flags & OFDF_ISFLOPPY) {
		lp->d_npartitions = MAXPARTITIONS;
		for (l = 0; l < lp->d_npartitions; l++) {
			if (l == RAW_PART)
				continue;
			/* struct copy */
			lp->d_partitions[l] =
			    lp->d_partitions[RAW_PART];
		}
		lp->d_checksum = dkcksum(lp);
	} else {
		errmes = readdisklabel(MAKEDISKDEV(major(dev),
		    unit, RAW_PART), ofdstrategy, lp,
		    of->sc_dk.dk_cpulabel);
		if (errmes != NULL)
			printf("%s: %s\n", errmes);
	}
}