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Annotation of Net2/arch/hp300/stand/sd.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1988 University of Utah.
        !             3:  * Copyright (c) 1990 The Regents of the University of California.
        !             4:  * All rights reserved.
        !             5:  *
        !             6:  * This code is derived from software contributed to Berkeley by
        !             7:  * Van Jacobson of Lawrence Berkeley Laboratory and the Systems
        !             8:  * Programming Group of the University of Utah Computer Science Department.
        !             9:  *
        !            10:  * Redistribution and use in source and binary forms, with or without
        !            11:  * modification, are permitted provided that the following conditions
        !            12:  * are met:
        !            13:  * 1. Redistributions of source code must retain the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer.
        !            15:  * 2. Redistributions in binary form must reproduce the above copyright
        !            16:  *    notice, this list of conditions and the following disclaimer in the
        !            17:  *    documentation and/or other materials provided with the distribution.
        !            18:  * 3. All advertising materials mentioning features or use of this software
        !            19:  *    must display the following acknowledgement:
        !            20:  *     This product includes software developed by the University of
        !            21:  *     California, Berkeley and its contributors.
        !            22:  * 4. Neither the name of the University nor the names of its contributors
        !            23:  *    may be used to endorse or promote products derived from this software
        !            24:  *    without specific prior written permission.
        !            25:  *
        !            26:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            27:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            28:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            29:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            30:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            31:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            32:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            33:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            34:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            35:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            36:  * SUCH DAMAGE.
        !            37:  *
        !            38:  * from: Utah $Hdr: sd.c 1.2 90/01/23$
        !            39:  *
        !            40:  *     @(#)sd.c        7.4 (Berkeley) 5/5/91
        !            41:  */
        !            42: 
        !            43: /*
        !            44:  * SCSI CCS disk driver
        !            45:  */
        !            46: 
        !            47: #include <sys/param.h>
        !            48: #include "saio.h"
        !            49: #include "samachdep.h"
        !            50: 
        !            51: #include "../dev/scsireg.h"
        !            52: 
        !            53: struct sd_softc {
        !            54:        char    sc_retry;
        !            55:        char    sc_alive;
        !            56:        short   sc_blkshift;
        !            57: } sd_softc[NSD];
        !            58: 
        !            59: int sdpartoff[] = {
        !            60:        1024,   17408,  0,      17408,
        !            61:        115712, 218112, 82944,  0
        !            62: };
        !            63: 
        !            64: #define        SDRETRY         2
        !            65: 
        !            66: sdinit(unit)
        !            67:        register int unit;
        !            68: {
        !            69:        register struct sd_softc *ss;
        !            70:        u_char stat;
        !            71:        int capbuf[2];
        !            72: 
        !            73:        if (unit > NSD)
        !            74:                return (0);
        !            75:        ss = &sd_softc[unit];
        !            76:        /* NB: HP6300 won't boot if next printf is removed (???) - vj */
        !            77:        printf("sd%d: ", unit);
        !            78:        if ((stat = scsi_test_unit_rdy(unit)) == 0) {
        !            79:                /* drive may be doing RTZ - wait a bit */
        !            80:                printf("not ready - retrying ... ");
        !            81:                if (stat == STS_CHECKCOND) {
        !            82:                        DELAY(1000000);
        !            83:                        if (scsi_test_unit_rdy(unit) == 0) {
        !            84:                                printf("giving up.\n");
        !            85:                                return (0);
        !            86:                        }
        !            87:                }
        !            88:        }
        !            89:        printf("unit ready.\n");
        !            90:        /*
        !            91:         * try to get the drive block size.
        !            92:         */
        !            93:        capbuf[0] = 0;
        !            94:        capbuf[1] = 0;
        !            95:        if (scsi_read_capacity(unit, (u_char *)capbuf, sizeof(capbuf)) != 0) {
        !            96:                if (capbuf[1] > DEV_BSIZE)
        !            97:                        for (; capbuf[1] > DEV_BSIZE; capbuf[1] >>= 1)
        !            98:                                ++ss->sc_blkshift;
        !            99:        }
        !           100:        ss->sc_alive = 1;
        !           101:        return (1);
        !           102: }
        !           103: 
        !           104: sdreset(unit)
        !           105: {
        !           106: }
        !           107: 
        !           108: sdopen(io)
        !           109:        struct iob *io;
        !           110: {
        !           111:        register int unit = io->i_unit;
        !           112:        register struct sd_softc *ss = &sd_softc[unit];
        !           113:        struct sdinfo *ri;
        !           114: 
        !           115:        if (scsialive(unit) == 0)
        !           116:                _stop("scsi controller not configured");
        !           117:        if (ss->sc_alive == 0)
        !           118:                if (sdinit(unit) == 0)
        !           119:                        _stop("sd init failed");
        !           120:        if (io->i_boff < 0 || io->i_boff > 7)
        !           121:                _stop("sd bad minor");
        !           122:        io->i_boff = sdpartoff[io->i_boff];
        !           123: }
        !           124: 
        !           125: sdstrategy(io, func)
        !           126:        register struct iob *io;
        !           127:        register int func;
        !           128: {
        !           129:        register int unit = io->i_unit;
        !           130:        register struct sd_softc *ss = &sd_softc[unit];
        !           131:        char stat;
        !           132:        daddr_t blk = io->i_bn >> ss->sc_blkshift;
        !           133:        u_int nblk = io->i_cc >> ss->sc_blkshift;
        !           134: 
        !           135:        ss->sc_retry = 0;
        !           136: retry:
        !           137:        if (func == F_READ)
        !           138:                stat = scsi_tt_read(unit, io->i_ma, io->i_cc, blk, nblk);
        !           139:        else
        !           140:                stat = scsi_tt_write(unit, io->i_ma, io->i_cc, blk, nblk);
        !           141:        if (stat) {
        !           142:                printf("sd(%d,?) err: 0x%x\n", unit, stat);
        !           143:                if (++ss->sc_retry > SDRETRY)
        !           144:                        return(-1);
        !           145:                else
        !           146:                        goto retry;
        !           147:        }
        !           148:        return(io->i_cc);
        !           149: }

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