/*      $NetBSD: ct.c,v 1.8 2021/07/05 14:51:23 tsutsui Exp $   */

/*
 * Copyright (c) 1982, 1990, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * 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.
 *
 *      @(#)ct.c        8.1 (Berkeley) 7/15/93
 */

/*
 * CS80 tape driver
 */
#include <sys/param.h>

#include <hp300/dev/ctreg.h>

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

struct  ct_iocmd ct_ioc;
struct  ct_rscmd ct_rsc;
struct  ct_stat ct_stat;
struct  ct_ssmcmd ct_ssmc;

struct  ct_softc {
        int     sc_ctlr;
        int     sc_unit;
        char    sc_retry;
        char    sc_alive;
        short   sc_punit;
        int     sc_blkno;
} ct_softc[NHPIB][NCT];

#define CTRETRY         5
#define MTFSF           10
#define MTREW           11

char ctio_buf[MAXBSIZE];

struct  ctinfo {
        short   hwid;
        short   punit;
} ctinfo[] = {
        { CT7946ID,     1 },
        { CT7912PID,    1 },
        { CT7914PID,    1 },
        { CT9144ID,     0 },
        { CT9145ID,     0 },
};
int     nctinfo = sizeof(ctinfo) / sizeof(ctinfo[0]);

static int ctinit(int, int);
static int ctident(int, int);
static int cterror(int, int);

int
ctinit(int ctlr, int unit)
{
        struct ct_softc *rs = &ct_softc[ctlr][unit];
        uint8_t stat;

        if (hpibrecv(ctlr, unit, C_QSTAT, &stat, 1) != 1 || stat)
                return 0;
        if (ctident(ctlr, unit) < 0)
                return 0;
        memset(&ct_ssmc, 0, sizeof(ct_ssmc));
        ct_ssmc.unit = C_SUNIT(rs->sc_punit);
        ct_ssmc.cmd = C_SSM;
        ct_ssmc.fefm = FEF_MASK;
        ct_ssmc.refm = REF_MASK;
        ct_ssmc.aefm = AEF_MASK;
        ct_ssmc.iefm = IEF_MASK;
        hpibsend(ctlr, unit, C_CMD, (uint8_t *)&ct_ssmc, sizeof(ct_ssmc));
        hpibswait(ctlr, unit);
        hpibrecv(ctlr, unit, C_QSTAT, &stat, 1);
        rs->sc_alive = 1;
        return 1;
}

int
ctident(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 < nctinfo; i++)
                if (id == ctinfo[i].hwid)
                        break;
        if (i == nctinfo)
                return -1;
        ct_softc[ctlr][unit].sc_punit = ctinfo[i].punit;
        id = i;

        /*
         * Collect device description.
         * Right now we only need this to differentiate 7945 from 7946.
         * Note that we always issue the describe command to unit 0.
         */
        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;
                }
        }
        switch (ctinfo[id].hwid) {
        case CT7946ID:
                if (memcmp(name, "079450", 6) == 0)
                        id = -1;                /* not really a 7946 */
                break;
        default:
                break;
        }
        return id;
}

int
ctpunit(int ctlr, int slave, int *punit)
{
        struct ct_softc *rs;

        if (ctlr >= NHPIB || hpibalive(ctlr) == 0)
                return EADAPT;
        if (slave >= NCT)
                return ECTLR;
        rs = &ct_softc[ctlr][slave];

        if (rs->sc_alive == 0)
                return ENXIO;

        *punit = rs->sc_punit;
        return 0;
}

int
ctopen(struct open_file *f, ...)
{
        va_list ap;
        int ctlr, unit, part;
        struct ct_softc *rs;
        int skip;
        size_t resid;

        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 >= NCT)
                return ECTLR;
        rs = &ct_softc[ctlr][unit];
        rs->sc_blkno = 0;
        rs->sc_unit = unit;
        rs->sc_ctlr = ctlr;
        if (rs->sc_alive == 0)
                if (ctinit(ctlr, unit) == 0)
                        return ENXIO;
        f->f_devdata = (void *)rs;
        ctstrategy(f->f_devdata, MTREW, 0, 0, ctio_buf, &resid);
        skip = part;
        while (skip--)
                ctstrategy(f->f_devdata, MTFSF, 0, 0, ctio_buf, &resid);
        return 0;
}

int
ctclose(struct open_file *f)
{
        size_t resid;

        ctstrategy(f->f_devdata, MTREW, 0, 0, ctio_buf, &resid);
        return 0;
}

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

        if (size == 0 && (func == F_READ || func == F_WRITE))
                return 0;

        rs->sc_retry = 0;
        memset(&ct_ioc, 0, sizeof(ct_ioc));
        ct_ioc.unit = C_SUNIT(rs->sc_punit);
        ct_ioc.saddr = C_SADDR;
        ct_ioc.nop2 = C_NOP;
        ct_ioc.slen = C_SLEN;
        ct_ioc.nop3 = C_NOP;
top:
        if (func == F_READ) {
                ct_ioc.cmd = C_READ;
                ct_ioc.addr = rs->sc_blkno;
                ct_ioc.len = size;
        }
        else if (func == F_WRITE) {
                ct_ioc.cmd = C_WRITE;
                ct_ioc.addr = rs->sc_blkno;
                ct_ioc.len = size;
        }
        else if (func == MTFSF) {
                ct_ioc.cmd = C_READ;
                ct_ioc.addr = rs->sc_blkno;
                ct_ioc.len = size = MAXBSIZE;
        }
        else {
                ct_ioc.cmd = C_READ;
                ct_ioc.addr = 0;
                ct_ioc.len = 0;
                rs->sc_blkno = 0;
                size = 0;
        }
retry:
        hpibsend(ctlr, unit, C_CMD, (uint8_t *)&ct_ioc, sizeof(ct_ioc));
        if (func != MTREW) {
                hpibswait(ctlr, unit);
                hpibgo(ctlr, unit, C_EXEC, buf, size,
                        func != F_WRITE ? F_READ : F_WRITE);
                hpibswait(ctlr, unit);
        } else {
                while (hpibswait(ctlr, unit) < 0)
                        ;
        }
        hpibrecv(ctlr, unit, C_QSTAT, &stat, 1);
        if (stat) {
                stat = cterror(ctlr, unit);
                if (stat == 0)
                        return -1;
                if (stat == 2)
                        return 0;
                if (++rs->sc_retry > CTRETRY)
                        return -1;
                goto retry;
        }
        rs->sc_blkno += CTBTOK(size);
        if (func == MTFSF)
                goto top;
        *rsize = size;

        return 0;
}

int
cterror(int ctlr, int unit)
{
        struct ct_softc *rs = &ct_softc[ctlr][unit];
        uint8_t stat;

        memset(&ct_rsc, 0, sizeof(ct_rsc));
        memset(&ct_stat, 0, sizeof(ct_stat));
        ct_rsc.unit = C_SUNIT(rs->sc_punit);
        ct_rsc.cmd = C_STATUS;
        hpibsend(ctlr, unit, C_CMD, (uint8_t *)&ct_rsc, sizeof(ct_rsc));
        hpibrecv(ctlr, unit, C_EXEC, (uint8_t *)&ct_stat, sizeof(ct_stat));
        hpibrecv(ctlr, unit, C_QSTAT, &stat, 1);
        if (stat) {
                printf("ct%d: request status fail %d\n", unit, stat);
                return 0;
        }
        if (ct_stat.c_aef & AEF_EOF) {
                /* 9145 drives don't increment block number at EOF */
                if ((ct_stat.c_blk - rs->sc_blkno) == 0)
                        rs->sc_blkno++;
                else
                        rs->sc_blkno = ct_stat.c_blk;
                return 2;
        }
        printf("ct%d err: vu 0x%x, pend 0x%x, bn%ld", unit,
            ct_stat.c_vu, ct_stat.c_pend, ct_stat.c_blk);
        printf(", R 0x%x F 0x%x A 0x%x I 0x%x\n", ct_stat.c_ref,
            ct_stat.c_fef, ct_stat.c_aef, ct_stat.c_ief);
        return 1;
}