/*      $NetBSD: rz.c,v 1.28 2021/07/24 21:31:34 andvar Exp $   */

/*
 * Copyright (c) 1992, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Van Jacobson of Lawrence Berkeley Laboratory and Ralph Campbell.
 *
 * 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. 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.
 *
 *      @(#)rz.c        8.1 (Berkeley) 6/10/93
 */

#include <lib/libsa/stand.h>
#include <lib/libkern/libkern.h>
#include <machine/dec_prom.h>

#include <sys/param.h>
#include <sys/disklabel.h>

#include "common.h"
#include "rz.h"

#define RF_PROTECTED_SECTORS    64      /* XXX refer to <.../rf_optnames.h> */


struct  rz_softc {
        int     sc_fd;                  /* PROM file id */
        int     sc_ctlr;                /* controller number */
        int     sc_unit;                /* disk unit number */
        int     sc_part;                /* disk partition number */
        struct  disklabel sc_label;     /* disk label for this disk */
};

int
rzstrategy(void *devdata, int rw, daddr_t bn, size_t reqcnt, void *addr, size_t *cnt)
        /* cnt:  out: number of bytes transferred */
{
        struct rz_softc *sc = (struct rz_softc *)devdata;
        int part = sc->sc_part;
        struct partition *pp = &sc->sc_label.d_partitions[part];
        int s;
        long offset;

        offset = bn;

        /*
         * Partial-block transfers not handled.
         */
        if (reqcnt & (DEV_BSIZE - 1)) {
                *cnt = 0;
                return (EINVAL);
        }

        offset += pp->p_offset;

        if (pp->p_fstype == FS_RAID)
                offset += RF_PROTECTED_SECTORS;

        /*
         * Convert from blocks to bytes.
         */
        offset *= DEV_BSIZE;

        if (callv == &callvec) {
                /* No REX on this machine */
                if (prom_lseek(sc->sc_fd, offset, 0) < 0)
                        return (EIO);
                s = prom_read(sc->sc_fd, addr, reqcnt);
        } else
                s = bootread (offset / 512, addr, reqcnt);
        if (s < 0)
                return (EIO);

        *cnt = s;
        return (0);
}

int
rzopen(struct open_file *f, ...)
{
        int ctlr, unit, part;

        struct rz_softc *sc;
        struct disklabel *lp;
        int i;
        char *msg;
        char buf[DEV_BSIZE];
        size_t cnt;
        static char device[] = "rz(0,0,0)";
        va_list ap;

        va_start(ap, f);

        ctlr = va_arg(ap, int);
        unit = va_arg(ap, int);
        part = va_arg(ap, int);
        va_end(ap);
        if (unit >= 8 || part >= 8)
                return (ENXIO);
        device[5] = '0' + unit;
        /* NOTE: only support reads for now */
        /* Another NOTE: bootinit on the TURBOchannel doesn't look at
           the device string - it's provided for compatibility with
           the DS3100 PROMs.   As a consequence, it may be possible to
           boot from some other drive with these bootblocks on the 3100,
           but will not be possible on any TURBOchannel machine. */

        if (callv == &callvec)
                i = prom_open(device, 0);
        else
                i = bootinit (device);
        if (i < 0) {
                printf("open failed\n");
                return (ENXIO);
        }

        sc = alloc(sizeof(struct rz_softc));
        memset(sc, 0, sizeof(struct rz_softc));
        f->f_devdata = (void *)sc;

        sc->sc_fd = i;
        sc->sc_ctlr = ctlr;
        sc->sc_unit = unit;
        sc->sc_part = part;

        /* try to read disk label and partition table information */
        lp = &sc->sc_label;
        lp->d_secsize = DEV_BSIZE;
        lp->d_secpercyl = 1;
        lp->d_npartitions = MAXPARTITIONS;
        lp->d_partitions[part].p_offset = 0;
        lp->d_partitions[part].p_size = 0x7fffffff;

        i = rzstrategy(sc, F_READ, (daddr_t)LABELSECTOR, DEV_BSIZE, buf, &cnt);
        if (i || cnt != DEV_BSIZE) {
                /* printf("rz%d: error reading disk label\n", unit); */
                goto bad;
        }
        msg = getdisklabel(buf, lp);
        if (msg) {
                /* If no label, just assume 0 and return */
                return (0);
        }

        if (part >= lp->d_npartitions || lp->d_partitions[part].p_size == 0) {
        bad:
                dealloc(sc, sizeof(struct rz_softc));
                return (ENXIO);
        }
        return (0);
}

#ifndef LIBSA_NO_DEV_CLOSE
int
rzclose(struct open_file *f)
{
        if (callv == &callvec)
                prom_close(((struct rz_softc *)f->f_devdata)->sc_fd);

        dealloc(f->f_devdata, sizeof(struct rz_softc));
        f->f_devdata = (void *)0;
        return (0);
}
#endif