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Annotation of 43BSDReno/sys/hpstand/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 is only permitted until one year after the first shipment
        !            11:  * of 4.4BSD by the Regents.  Otherwise, redistribution and use in source and
        !            12:  * binary forms are permitted provided that: (1) source distributions retain
        !            13:  * this entire copyright notice and comment, and (2) distributions including
        !            14:  * binaries display the following acknowledgement:  This product includes
        !            15:  * software developed by the University of California, Berkeley and its
        !            16:  * contributors'' in the documentation or other materials provided with the
        !            17:  * distribution and in all advertising materials mentioning features or use
        !            18:  * of this software.  Neither the name of the University nor the names of
        !            19:  * its contributors may be used to endorse or promote products derived from
        !            20:  * this software without specific prior written permission.
        !            21:  * THIS SOFTWARE IS PROVIDED AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            22:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            23:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            24:  *
        !            25:  * from: Utah $Hdr: sd.c 1.2 90/01/23$
        !            26:  *
        !            27:  *     @(#)sd.c        7.2 (Berkeley) 5/25/90
        !            28:  */
        !            29: 
        !            30: /*
        !            31:  * SCSI CCS disk driver
        !            32:  */
        !            33: 
        !            34: #include "saio.h"
        !            35: #include "samachdep.h"
        !            36: 
        !            37: #include "../hpdev/scsireg.h"
        !            38: 
        !            39: struct sd_softc {
        !            40:        char    sc_retry;
        !            41:        char    sc_alive;
        !            42:        short   sc_blkshift;
        !            43: } sd_softc[NSD];
        !            44: 
        !            45: int sdpartoff[] = {
        !            46:        1024,   17408,  0,      17408,
        !            47:        115712, 218112, 82944,  0
        !            48: };
        !            49: 
        !            50: #define        SDRETRY         2
        !            51: 
        !            52: sdinit(unit)
        !            53:        register int unit;
        !            54: {
        !            55:        register struct sd_softc *ss;
        !            56:        u_char stat;
        !            57:        int capbuf[2];
        !            58: 
        !            59:        if (unit > NSD)
        !            60:                return (0);
        !            61:        ss = &sd_softc[unit];
        !            62:        /* NB: HP6300 won't boot if next printf is removed (???) - vj */
        !            63:        printf("sd%d: ", unit);
        !            64:        if ((stat = scsi_test_unit_rdy(unit)) == 0) {
        !            65:                /* drive may be doing RTZ - wait a bit */
        !            66:                printf("not ready - retrying ... ");
        !            67:                if (stat == STS_CHECKCOND) {
        !            68:                        DELAY(1000000);
        !            69:                        if (scsi_test_unit_rdy(unit) == 0) {
        !            70:                                printf("giving up.\n");
        !            71:                                return (0);
        !            72:                        }
        !            73:                }
        !            74:        }
        !            75:        printf("unit ready.\n");
        !            76:        /*
        !            77:         * try to get the drive block size.
        !            78:         */
        !            79:        capbuf[0] = 0;
        !            80:        capbuf[1] = 0;
        !            81:        if (scsi_read_capacity(unit, (u_char *)capbuf, sizeof(capbuf)) != 0) {
        !            82:                if (capbuf[1] > DEV_BSIZE)
        !            83:                        for (; capbuf[1] > DEV_BSIZE; capbuf[1] >>= 1)
        !            84:                                ++ss->sc_blkshift;
        !            85:        }
        !            86:        ss->sc_alive = 1;
        !            87:        return (1);
        !            88: }
        !            89: 
        !            90: sdreset(unit)
        !            91: {
        !            92: }
        !            93: 
        !            94: sdopen(io)
        !            95:        struct iob *io;
        !            96: {
        !            97:        register int unit = io->i_unit;
        !            98:        register struct sd_softc *ss = &sd_softc[unit];
        !            99:        struct sdinfo *ri;
        !           100: 
        !           101:        if (scsialive(unit) == 0)
        !           102:                _stop("scsi controller not configured");
        !           103:        if (ss->sc_alive == 0)
        !           104:                if (sdinit(unit) == 0)
        !           105:                        _stop("sd init failed");
        !           106:        if (io->i_boff < 0 || io->i_boff > 7)
        !           107:                _stop("sd bad minor");
        !           108:        io->i_boff = sdpartoff[io->i_boff];
        !           109: }
        !           110: 
        !           111: sdstrategy(io, func)
        !           112:        register struct iob *io;
        !           113:        register int func;
        !           114: {
        !           115:        register int unit = io->i_unit;
        !           116:        register struct sd_softc *ss = &sd_softc[unit];
        !           117:        char stat;
        !           118:        daddr_t blk = io->i_bn >> ss->sc_blkshift;
        !           119:        u_int nblk = io->i_cc >> ss->sc_blkshift;
        !           120: 
        !           121:        ss->sc_retry = 0;
        !           122: retry:
        !           123:        if (func == READ)
        !           124:                stat = scsi_tt_read(unit, io->i_ma, io->i_cc, blk, nblk);
        !           125:        else
        !           126:                stat = scsi_tt_write(unit, io->i_ma, io->i_cc, blk, nblk);
        !           127:        if (stat) {
        !           128:                printf("sd(%d,?) err: 0x%x\n", unit, stat);
        !           129:                if (++ss->sc_retry > SDRETRY)
        !           130:                        return(-1);
        !           131:                else
        !           132:                        goto retry;
        !           133:        }
        !           134:        return(io->i_cc);
        !           135: }

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