usr/src/sys/hp300/stand/sd.c

/*
 * Copyright (c) 1988 University of Utah.
 * Copyright (c) 1990 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 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 $Hdr: sd.c 1.2 90/01/23$
 *
 *      @(#)sd.c        7.4 (Berkeley) 5/5/91
 */

/*
 * SCSI CCS disk driver
 */

#include <sys/param.h>
#include "saio.h"
#include "samachdep.h"

#include "../dev/scsireg.h"

struct  sd_softc {
        char    sc_retry;
        char    sc_alive;
        short   sc_blkshift;
} sd_softc[NSD];

int sdpartoff[] = {
        1024,   17408,  0,      17408,
        115712, 218112, 82944,  0
};

#define SDRETRY         2

sdinit(unit)
        register int unit;
{
        register struct sd_softc *ss;
        u_char stat;
        int capbuf[2];

        if (unit > NSD)
                return (0);
        ss = &sd_softc[unit];
        /* NB: HP6300 won't boot if next printf is removed (???) - vj */
        printf("sd%d: ", unit);
        if ((stat = scsi_test_unit_rdy(unit)) == 0) {
                /* drive may be doing RTZ - wait a bit */
                printf("not ready - retrying ... ");
                if (stat == STS_CHECKCOND) {
                        DELAY(1000000);
                        if (scsi_test_unit_rdy(unit) == 0) {
                                printf("giving up.\n");
                                return (0);
                        }
                }
        }
        printf("unit ready.\n");
        /*
         * try to get the drive block size.
         */
        capbuf[0] = 0;
        capbuf[1] = 0;
        if (scsi_read_capacity(unit, (u_char *)capbuf, sizeof(capbuf)) != 0) {
                if (capbuf[1] > DEV_BSIZE)
                        for (; capbuf[1] > DEV_BSIZE; capbuf[1] >>= 1)
                                ++ss->sc_blkshift;
        }
        ss->sc_alive = 1;
        return (1);
}

sdreset(unit)
{
}

sdopen(io)
        struct iob *io;
{
        register int unit = io->i_unit;
        register struct sd_softc *ss = &sd_softc[unit];
        struct sdinfo *ri;

        if (scsialive(unit) == 0)
                _stop("scsi controller not configured");
        if (ss->sc_alive == 0)
                if (sdinit(unit) == 0)
                        _stop("sd init failed");
        if (io->i_boff < 0 || io->i_boff > 7)
                _stop("sd bad minor");
        io->i_boff = sdpartoff[io->i_boff];
}

sdstrategy(io, func)
        register struct iob *io;
        register int func;
{
        register int unit = io->i_unit;
        register struct sd_softc *ss = &sd_softc[unit];
        char stat;
        daddr_t blk = io->i_bn >> ss->sc_blkshift;
        u_int nblk = io->i_cc >> ss->sc_blkshift;

        ss->sc_retry = 0;
retry:
        if (func == F_READ)
                stat = scsi_tt_read(unit, io->i_ma, io->i_cc, blk, nblk);
        else
                stat = scsi_tt_write(unit, io->i_ma, io->i_cc, blk, nblk);
        if (stat) {
                printf("sd(%d,?) err: 0x%x\n", unit, stat);
                if (++ss->sc_retry > SDRETRY)
                        return(-1);
                else
                        goto retry;
        }
        return(io->i_cc);
}