/*      $NetBSD: rd.c,v 1.17 2023/02/12 16:04:57 andvar Exp $   */

/*
 * Copyright (c) 1988 University of Utah.
 * Copyright (c) 1982, 1990, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * 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. 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: rd.c 1.20 92/12/21
 *
 *      @(#)rd.c        8.1 (Berkeley) 7/15/93
 */

/*
 * CS80/SS80 disk driver
 */
#include <sys/param.h>
#include <sys/disklabel.h>

#include <lib/libsa/stand.h>

#include <hp300/dev/rdreg.h>

#include <hp300/stand/common/conf.h>
#include <hp300/stand/common/hpibvar.h>
#include <hp300/stand/common/samachdep.h>

static struct   rd_iocmd rd_ioc;
static struct   rd_rscmd rd_rsc;
static struct   rd_stat rd_stat;
static struct   rd_ssmcmd rd_ssmc;

static struct   disklabel rdlabel;

struct  rdminilabel {
        u_short npart;
        u_long  offset[MAXPARTITIONS];
};

struct  rd_softc {
        int     sc_ctlr;
        int     sc_unit;
        int     sc_part;
        char    sc_retry;
        char    sc_alive;
        short   sc_type;
        struct  rdminilabel sc_pinfo;
};

#define RDRETRY         5

struct  rdidentinfo {
        short   ri_hwid;
        short   ri_maxunum;
        int     ri_nblocks;
};

static int rdinit(int, int);
static int rdident(int, int);
static void rdreset(int, int);
static int rdgetinfo(struct rd_softc *);
static int rderror(int, int, int);

static struct rd_softc rd_softc[NHPIB][NRD];

static const struct rdidentinfo rdidentinfo[] = {
        [RD7945A]  = { RD7946AID,       0,      NRD7945ABLK },
        [RD9134D]  = { RD9134DID,       1,      NRD9134DBLK },
        [RD9122S]  = { RD9134LID,       1,      NRD9122SBLK },
        [RD7912P]  = { RD7912PID,       0,      NRD7912PBLK },
        [RD7914P]  = { RD7914PID,       0,      NRD7914PBLK },
        [RD7958A]  = { RD7958AID,       0,      NRD7958ABLK },
        [RD7957A]  = { RD7957AID,       0,      NRD7957ABLK },
        [RD7933H]  = { RD7933HID,       0,      NRD7933HBLK },
        [RD9134L]  = { RD9134LID,       1,      NRD9134LBLK },
        [RD7936H]  = { RD7936HID,       0,      NRD7936HBLK },
        [RD7937H]  = { RD7937HID,       0,      NRD7937HBLK },
        [RD7914CT] = { RD7914CTID,      0,      NRD7914PBLK },
        [RD7946A]  = { RD7946AID,       0,      NRD7945ABLK },
        [RD9122D]  = { RD9134LID,       1,      NRD9122SBLK },
        [RD7957B]  = { RD7957BID,       0,      NRD7957BBLK },
        [RD7958B]  = { RD7958BID,       0,      NRD7958BBLK },
        [RD7959B]  = { RD7959BID,       0,      NRD7959BBLK },
        [RD2200A]  = { RD2200AID,       0,      NRD2200ABLK },
        [RD2203A]  = { RD2203AID,       0,      NRD2203ABLK },
        [RD2202A]  = { RD2202AID,       0,      NRD2202ABLK },
        [RD7908A]  = { RD7908AID,       0,      NRD7908ABLK },
        [RD7911A]  = { RD7911AID,       0,      NRD7911ABLK },
        [RD7941A]  = { RD7946AID,       0,      NRD7941ABLK }
};
static const int numrdidentinfo = sizeof(rdidentinfo) / sizeof(rdidentinfo[0]);

static int
rdinit(int ctlr, int unit)
{
        struct rd_softc *rs = &rd_softc[ctlr][unit];

        rs->sc_type = rdident(ctlr, unit);
        if (rs->sc_type < 0)
                return 0;
        rs->sc_alive = 1;
        return 1;
}

static void
rdreset(int ctlr, int unit)
{
        uint8_t stat;

        rd_ssmc.c_unit = C_SUNIT(0);
        rd_ssmc.c_cmd = C_SSM;
        rd_ssmc.c_refm = REF_MASK;
        rd_ssmc.c_fefm = FEF_MASK;
        rd_ssmc.c_aefm = AEF_MASK;
        rd_ssmc.c_iefm = IEF_MASK;
        hpibsend(ctlr, unit, C_CMD, (uint8_t *)&rd_ssmc, sizeof(rd_ssmc));
        hpibswait(ctlr, unit);
        hpibrecv(ctlr, unit, C_QSTAT, &stat, 1);
}

static int
rdident(int ctlr, int unit)
{
        struct cs80_describe desc;
        uint8_t stat, cmd[3];
        char name[7];
        int id, i;

        id = hpibid(ctlr, unit);
        if ((id & 0x200) == 0)
                return -1;
        for (i = 0; i < numrdidentinfo; i++)
                if (id == rdidentinfo[i].ri_hwid)
                        break;
        if (i == numrdidentinfo)
                return -1;
        id = i;
        rdreset(ctlr, unit);
        cmd[0] = C_SUNIT(0);
        cmd[1] = C_SVOL(0);
        cmd[2] = C_DESC;
        hpibsend(ctlr, unit, C_CMD, cmd, sizeof(cmd));
        hpibrecv(ctlr, unit, C_EXEC, (uint8_t *)&desc, sizeof(desc));
        hpibrecv(ctlr, unit, C_QSTAT, &stat, sizeof(stat));
        memset(name, 0, sizeof(name));
        if (!stat) {
                int n = desc.d_name;
                for (i = 5; i >= 0; i--) {
                        name[i] = (n & 0xf) + '0';
                        n >>= 4;
                }
        }
        /*
         * Take care of a couple of anomalies:
         * 1. 7945A and 7946A both return same HW id
         * 2. 9122S and 9134D both return same HW id
         * 3. 9122D and 9134L both return same HW id
         */
        switch (rdidentinfo[id].ri_hwid) {
        case RD7946AID:
                if (memcmp(name, "079450", 6) == 0)
                        id = RD7945A;
                else if (memcmp(name, "079410", 6) == 0)
                        id = RD7941A;
                else
                        id = RD7946A;
                break;

        case RD9134LID:
                if (memcmp(name, "091340", 6) == 0)
                        id = RD9134L;
                else
                        id = RD9122D;
                break;

        case RD9134DID:
                if (memcmp(name, "091220", 6) == 0)
                        id = RD9122S;
                else
                        id = RD9134D;
                break;
        }
        return id;
}

static char io_buf[MAXBSIZE];

static int
rdgetinfo(struct rd_softc *rs)
{
        struct rdminilabel *pi = &rs->sc_pinfo;
        struct disklabel *lp = &rdlabel;
        char *msg;
        int err, savepart;
        size_t i;

        memset((void *)lp, 0, sizeof *lp);
        lp->d_secsize = DEV_BSIZE;

        /* Disklabel is always from RAW_PART. */
        savepart = rs->sc_part;
        rs->sc_part = RAW_PART;
        err = rdstrategy(rs, F_READ, LABELSECTOR,
            lp->d_secsize ? lp->d_secsize : DEV_BSIZE, io_buf, &i);
        rs->sc_part = savepart;

        if (err) {
                printf("rdgetinfo: rdstrategy error %d\n", err);
                return 0;
        }

        msg = getdisklabel(io_buf, lp);
        if (msg) {
                printf("rd(%d,%d,%d): WARNING: %s\n",
                       rs->sc_ctlr, rs->sc_unit, rs->sc_part, msg);
                pi->npart = 3;
                pi->offset[0] = pi->offset[1] = -1;
                pi->offset[2] = 0;
        } else {
                pi->npart = lp->d_npartitions;
                for (i = 0; i < pi->npart; i++)
                        pi->offset[i] = lp->d_partitions[i].p_size == 0 ?
                                -1 : lp->d_partitions[i].p_offset;
        }
        return 1;
}

int
rdopen(struct open_file *f, ...)
{
        va_list ap;
        int ctlr, unit, part;
        struct rd_softc *rs;

        va_start(ap, f);
        ctlr = va_arg(ap, int);
        unit = va_arg(ap, int);
        part = va_arg(ap, int);
        va_end(ap);

        if (ctlr >= NHPIB || hpibalive(ctlr) == 0)
                return EADAPT;
        if (unit >= NRD)
                return ECTLR;
        rs = &rd_softc[ctlr][unit];
        rs->sc_part = part;
        rs->sc_unit = unit;
        rs->sc_ctlr = ctlr;
        if (rs->sc_alive == 0) {
                if (rdinit(ctlr, unit) == 0)
                        return ENXIO;
                if (rdgetinfo(rs) == 0)
                        return ERDLAB;
        }
        if (part != RAW_PART &&     /* always allow RAW_PART to be opened */
            (part >= rs->sc_pinfo.npart || rs->sc_pinfo.offset[part] == -1))
                return EPART;
        f->f_devdata = (void *)rs;
        return 0;
}

int
rdclose(struct open_file *f)
{
        struct rd_softc *rs = f->f_devdata;

        /*
         * Mark the disk `not alive' so that the disklabel
         * will be re-loaded at next open.
         */
        memset(rs, 0, sizeof(struct rd_softc));
        f->f_devdata = NULL;

        return 0;
}

int
rdstrategy(void *devdata, int func, daddr_t dblk, size_t size, void *v_buf,
    size_t *rsize)
{
        uint8_t *buf = v_buf;
        struct rd_softc *rs = devdata;
        int ctlr = rs->sc_ctlr;
        int unit = rs->sc_unit;
        daddr_t blk;
        uint8_t stat;

        if (size == 0)
                return 0;

        /*
         * Don't do partition translation on the `raw partition'.
         */
        blk = (dblk + ((rs->sc_part == RAW_PART) ? 0 :
            rs->sc_pinfo.offset[rs->sc_part]));

        rs->sc_retry = 0;
        rd_ioc.c_unit = C_SUNIT(0);
        rd_ioc.c_volume = C_SVOL(0);
        rd_ioc.c_saddr = C_SADDR;
        rd_ioc.c_hiaddr = 0;
        rd_ioc.c_addr = RDBTOS(blk);
        rd_ioc.c_nop2 = C_NOP;
        rd_ioc.c_slen = C_SLEN;
        rd_ioc.c_len = size;
        rd_ioc.c_cmd = func == F_READ ? C_READ : C_WRITE;
retry:
        hpibsend(ctlr, unit, C_CMD, (uint8_t *)&rd_ioc.c_unit,
            sizeof(rd_ioc) - 2);
        hpibswait(ctlr, unit);
        hpibgo(ctlr, unit, C_EXEC, buf, size, func);
        hpibswait(ctlr, unit);
        hpibrecv(ctlr, unit, C_QSTAT, &stat, 1);
        if (stat) {
                if (rderror(ctlr, unit, rs->sc_part) == 0)
                        return EIO;
                if (++rs->sc_retry > RDRETRY)
                        return EIO;
                goto retry;
        }
        *rsize = size;

        return 0;
}

static int
rderror(int ctlr, int unit, int part)
{
        uint8_t stat;

        rd_rsc.c_unit = C_SUNIT(0);
        rd_rsc.c_sram = C_SRAM;
        rd_rsc.c_ram = C_RAM;
        rd_rsc.c_cmd = C_STATUS;
        hpibsend(ctlr, unit, C_CMD, (uint8_t *)&rd_rsc, sizeof(rd_rsc));
        hpibrecv(ctlr, unit, C_EXEC, (uint8_t *)&rd_stat, sizeof(rd_stat));
        hpibrecv(ctlr, unit, C_QSTAT, &stat, 1);
        if (stat) {
                printf("rd(%d,%d,0,%d): request status fail %d\n",
                       ctlr, unit, part, stat);
                return 0;
        }
        printf("rd(%d,%d,0,%d) err: vu 0x%x",
               ctlr, unit, part, rd_stat.c_vu);
        if ((rd_stat.c_aef & AEF_UD) || (rd_stat.c_ief & (IEF_MD|IEF_RD)))
                printf(", block %d", rd_stat.c_blk);
        printf(", R0x%x F0x%x A0x%x I0x%x\n",
               rd_stat.c_ref, rd_stat.c_fef, rd_stat.c_aef, rd_stat.c_ief);
        return 1;
}