Expand PMF_FN_* macros.

[netbsd-mini2440.git] / sys / dev / gpib / ct.c

/*      $NetBSD: ct.c,v 1.21 2009/05/12 14:21:58 cegger Exp $ */

/*-
 * Copyright (c) 1996-2003 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jason R. Thorpe.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
 */

/*
 * 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 $Hdr: rd.c 1.44 92/12/26$
 *
 *      @(#)rd.c        8.2 (Berkeley) 5/19/94
 */

/*
 * Copyright (c) 1988 University of Utah.
 *
 * 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. 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 $Hdr: rd.c 1.44 92/12/26$
 *
 *      @(#)rd.c        8.2 (Berkeley) 5/19/94
 */

/*
 * CS/80 cartridge tape driver (HP9144, HP88140, HP9145)
 *
 * Reminder:
 *      C_CC bit (character count option) when used in the CS/80 command
 *      'set options' will cause the tape not to stream.
 *
 * TODO:
 *      make filesystem compatible
 *      make block mode work according to mtio(4) spec. (if possible)
 *      merge with CS/80 disk driver
 *      finish support of HP9145
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ct.c,v 1.21 2009/05/12 14:21:58 cegger Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/bufq.h>
#include <sys/conf.h>
#include <sys/device.h>
#include <sys/ioctl.h>
#include <sys/mtio.h>
#include <sys/proc.h>
#include <sys/tprintf.h>

#include <dev/gpib/ctreg.h>     /* XXX must be before cs80busvar.h ATM */

#include <dev/gpib/gpibvar.h>
#include <dev/gpib/cs80busvar.h>

/* number of eof marks to remember */
#define EOFS    128

#ifdef DEBUG
int ctdebug = 0xff;
#define CDB_FILES       0x01
#define CDB_BSF         0x02
#define CDB_IDENT       0x04
#define CDB_FAIL        0x08
#define CDB_FOLLOW      0x10
#define DPRINTF(mask, str)      if (ctdebug & (mask)) printf str
#else
#define DPRINTF(mask, str)      /* nothing */
#endif

struct  ct_softc {
        struct  device sc_dev;

        gpib_chipset_tag_t sc_ic;
        gpib_handle_t sc_hdl;

        int     sc_slave;               /* GPIB slave ID */
        int     sc_punit;               /* physical unit */
        struct  ct_iocmd sc_ioc;
        struct  ct_rscmd sc_rsc;
        struct  cs80_stat sc_stat;
        struct  bufq_state *sc_tab;
        int     sc_active;
        struct  buf *sc_bp;
        struct  buf sc_bufstore;        /* XXX */
        int     sc_blkno;
        int     sc_cmd;
        int     sc_resid;
        char    *sc_addr;
        int     sc_flags;
#define CTF_OPEN        0x01
#define CTF_ALIVE       0x02
#define CTF_WRT         0x04
#define CTF_CMD         0x08
#define CTF_IO          0x10
#define CTF_BEOF        0x20
#define CTF_AEOF        0x40
#define CTF_EOT         0x80
#define CTF_STATWAIT    0x100
#define CTF_CANSTREAM   0x200
#define CTF_WRTTN       0x400
        short   sc_type;
        tpr_t   sc_tpr;
        int     sc_eofp;
        int     sc_eofs[EOFS];
};

int     ctmatch(device_t, cfdata_t, void *);
void    ctattach(device_t, device_t, void *);

CFATTACH_DECL(ct, sizeof(struct ct_softc),
        ctmatch, ctattach, NULL, NULL);

int     ctident(device_t, struct ct_softc *,
            struct cs80bus_attach_args *);

int     ctlookup(int, int, int);
void    ctaddeof(struct ct_softc *);
void    ctustart(struct ct_softc *);
void    cteof(struct ct_softc *, struct buf *);
void    ctdone(struct ct_softc *, struct buf *);

void    ctcallback(void *, int);
void    ctstart(struct ct_softc *);
void    ctintr(struct ct_softc *);

void    ctcommand(dev_t, int, int);

dev_type_open(ctopen);
dev_type_close(ctclose);
dev_type_read(ctread);
dev_type_write(ctwrite);
dev_type_ioctl(ctioctl);
dev_type_strategy(ctstrategy);

const struct bdevsw ct_bdevsw = {
        ctopen, ctclose, ctstrategy, ctioctl, nodump, nosize, D_TAPE
};

const struct cdevsw ct_cdevsw = {
        ctopen, ctclose, ctread, ctwrite, ctioctl,
        nostop, notty, nopoll, nommap, nokqfilter, D_TAPE
};

extern struct cfdriver ct_cd;

struct  ctinfo {
        short   hwid;
        short   punit;
        const char      *desc;
} ctinfo[] = {
        { CT7946ID,     1,      "7946A" },
        { CT7912PID,    1,      "7912P" },
        { CT7914PID,    1,      "7914P" },
        { CT9144ID,     0,      "9144"  },
        { CT9145ID,     0,      "9145"  },
        { CT35401ID,    0,      "35401A"},
};
int     nctinfo = sizeof(ctinfo) / sizeof(ctinfo[0]);

#define CT_NOREW        4
#define CT_STREAM       8
#define CTUNIT(x)       (minor(x) & 0x03)

int
ctlookup(int id, int slave, int punit)
{
        int i;

        for (i = 0; i < nctinfo; i++)
                if (ctinfo[i].hwid == id)
                        break;
        if (i == nctinfo)
                return (-1);
        return (i);
}

int
ctmatch(device_t parent, cfdata_t match, void *aux)
{
        struct cs80bus_attach_args *ca = aux;
        int i;

        if ((i = ctlookup(ca->ca_id, ca->ca_slave, ca->ca_punit)) < 0)
                return (0);
        ca->ca_punit = ctinfo[i].punit;
        return (1);
}

void
ctattach(device_t parent, device_t self, void *aux)
{
        struct ct_softc *sc = device_private(self);
        struct cs80bus_attach_args *ca = aux;
        struct cs80_description csd;
        char name[7];
        int type, i, n, canstream = 0;

        sc->sc_ic = ca->ca_ic;
        sc->sc_slave = ca->ca_slave;
        sc->sc_punit = ca->ca_punit;

        if ((type = ctlookup(ca->ca_id, ca->ca_slave, ca->ca_punit)) < 0)
                return;

        if (cs80reset(parent, sc->sc_slave, sc->sc_punit)) {
                aprint_normal("\n");
                aprint_error_dev(&sc->sc_dev, "can't reset device\n");
                return;
        }

        if (cs80describe(parent, sc->sc_slave, sc->sc_punit, &csd)) {
                aprint_normal("\n");
                aprint_error_dev(&sc->sc_dev, "didn't respond to describe command\n");
                return;
        }
        memset(name, 0, sizeof(name));
        for (i=0, n=0; i<3; i++) {
                name[n++] = (csd.d_name[i] >> 4) + '0';
                name[n++] = (csd.d_name[i] & 0x0f) + '0';
        }

#ifdef DEBUG
        if (ctdebug & CDB_IDENT) {
                printf("\n%s: name: ('%s')\n",
                    device_xname(&sc->sc_dev),name);
                printf("  iuw %x, maxxfr %d, ctype %d\n",
                    csd.d_iuw, csd.d_cmaxxfr, csd.d_ctype);
                printf("  utype %d, bps %d, blkbuf %d, burst %d, blktime %d\n",
                    csd.d_utype, csd.d_sectsize,
                    csd.d_blkbuf, csd.d_burstsize, csd.d_blocktime);
                printf("  avxfr %d, ort %d, atp %d, maxint %d, fv %x, rv %x\n",
                    csd.d_uavexfr, csd.d_retry, csd.d_access,
                    csd.d_maxint, csd.d_fvbyte, csd.d_rvbyte);
                printf("  maxcyl/head/sect %d/%d/%d, maxvsect %d, inter %d\n",
                    csd.d_maxcylhead >> 8 , csd.d_maxcylhead & 0xff,
                    csd.d_maxsect, csd.d_maxvsectl, csd.d_interleave);
                printf("%s", device_xname(&sc->sc_dev));
        }
#endif

        switch (ca->ca_id) {
        case CT7946ID:
                if (memcmp(name, "079450", 6) == 0)
                        return;                 /* not really a 7946 */
                /* fall into... */
        case CT9144ID:
        case CT9145ID:
        case CT35401ID:
                sc->sc_type = CT9144;
                canstream = 1;
                break;

        case CT7912PID:
        case CT7914PID:
                sc->sc_type = CT88140;
                break;
        default:
                sc->sc_type = type;
                break;
        }

        sc->sc_type = type;
        sc->sc_flags = canstream ? CTF_CANSTREAM : 0;
        printf(": %s %stape\n", ctinfo[type].desc,
            canstream ? "streaming " : "");

        bufq_alloc(&sc->sc_tab, "fcfs", 0);

        if (gpibregister(sc->sc_ic, sc->sc_slave, ctcallback, sc,
            &sc->sc_hdl)) {
                aprint_error_dev(&sc->sc_dev, "can't register callback\n");
                return;
        }

        sc->sc_flags |= CTF_ALIVE;
}

/*ARGSUSED*/
int
ctopen(dev_t dev, int flag, int type, struct lwp *l)
{
        struct ct_softc *sc;
        u_int8_t opt;

        sc = device_lookup_private(&ct_cd, CTUNIT(dev));
        if (sc == NULL || (sc->sc_flags & CTF_ALIVE) == 0)
                return (ENXIO);

        if (sc->sc_flags & CTF_OPEN)
                return (EBUSY);

        if ((dev & CT_STREAM) && (sc->sc_flags & CTF_CANSTREAM))
                opt = C_SPAR | C_IMRPT;
        else
                opt = C_SPAR;

        if (cs80setoptions(device_parent(&sc->sc_dev), sc->sc_slave,
            sc->sc_punit, opt))
                return (EBUSY);

        sc->sc_tpr = tprintf_open(l->l_proc);
        sc->sc_flags |= CTF_OPEN;

        return (0);
}

/*ARGSUSED*/
int
ctclose(dev_t dev, int flag, int fmt, struct lwp *l)
{
        struct ct_softc *sc;

        sc = device_lookup_private(&ct_cd, CTUNIT(dev));
        if (sc == NULL)
                return (ENXIO);

        if ((sc->sc_flags & (CTF_WRT|CTF_WRTTN)) == (CTF_WRT|CTF_WRTTN) &&
            (sc->sc_flags & CTF_EOT) == 0 ) { /* XXX return error if EOT ?? */
                ctcommand(dev, MTWEOF, 2);
                ctcommand(dev, MTBSR, 1);
                if (sc->sc_eofp == EOFS - 1)
                        sc->sc_eofs[EOFS - 1]--;
                else
                        sc->sc_eofp--;
                DPRINTF(CDB_BSF, ("%s: ctclose backup eofs prt %d blk %d\n",
                    device_xname(&sc->sc_dev), sc->sc_eofp,
                    sc->sc_eofs[sc->sc_eofp]));
        }

        if ((minor(dev) & CT_NOREW) == 0)
                ctcommand(dev, MTREW, 1);
        sc->sc_flags &= ~(CTF_OPEN | CTF_WRT | CTF_WRTTN);
        tprintf_close(sc->sc_tpr);
        DPRINTF(CDB_FILES, ("ctclose: flags %x\n", sc->sc_flags));

        return (0);     /* XXX */
}

void
ctcommand(dev_t dev, int cmd, int cnt)
{
        struct ct_softc *sc;
        struct buf *bp;
        struct buf *nbp = 0;

        sc = device_lookup_private(&ct_cd, CTUNIT(dev));
        bp = &sc->sc_bufstore;

        DPRINTF(CDB_FOLLOW, ("ctcommand: called\n"));

        if (cmd == MTBSF && sc->sc_eofp == EOFS - 1) {
                cnt = sc->sc_eofs[EOFS - 1] - cnt;
                ctcommand(dev, MTREW, 1);
                ctcommand(dev, MTFSF, cnt);
                cnt = 2;
                cmd = MTBSR;
        }

        if (cmd == MTBSF && sc->sc_eofp - cnt < 0) {
                cnt = 1;
                cmd = MTREW;
        }

        sc->sc_flags |= CTF_CMD;
        sc->sc_bp = bp;
        sc->sc_cmd = cmd;
        bp->b_dev = dev;
        bp->b_objlock = &buffer_lock;
        if (cmd == MTFSF) {
                nbp = (struct buf *)geteblk(MAXBSIZE);
                bp->b_data = nbp->b_data;
                bp->b_bcount = MAXBSIZE;
        }

        while (cnt-- > 0) {
                bp->b_flags = 0;
                bp->b_cflags = BC_BUSY;
                bp->b_oflags = 0;
                if (cmd == MTBSF) {
                        sc->sc_blkno = sc->sc_eofs[sc->sc_eofp];
                        sc->sc_eofp--;
                        DPRINTF(CDB_BSF, ("%s: backup eof pos %d blk %d\n",
                            device_xname(&sc->sc_dev), sc->sc_eofp,
                            sc->sc_eofs[sc->sc_eofp]));
                }
                ctstrategy(bp);
                biowait(bp);
        }
        bp->b_flags = 0;
        sc->sc_flags &= ~CTF_CMD;
        if (nbp)
                brelse(nbp, 0);
}

void
ctstrategy(struct buf *bp)
{
        struct ct_softc *sc;
        int s;

        DPRINTF(CDB_FOLLOW, ("cdstrategy(%p): dev %" PRIx64 ", bn %" PRIx64
            ", bcount %x, %c\n",
            bp, bp->b_dev, bp->b_blkno, bp->b_bcount,
            (bp->b_flags & B_READ) ? 'R' : 'W'));

        sc = device_lookup_private(&ct_cd, CTUNIT(bp->b_dev));

        s = splbio();
        bufq_put(sc->sc_tab, bp);
        if (sc->sc_active == 0) {
                sc->sc_active = 1;
                ctustart(sc);
        }
        splx(s);
}

void
ctustart(struct ct_softc *sc)
{
        struct buf *bp;

        bp = bufq_peek(sc->sc_tab);
        sc->sc_addr = bp->b_data;
        sc->sc_resid = bp->b_bcount;
        if (gpibrequest(sc->sc_ic, sc->sc_hdl))
                ctstart(sc);
}

void
ctstart(struct ct_softc *sc)
{
        struct buf *bp;
        struct ct_ulcmd ul;
        struct ct_wfmcmd wfm;
        int i, slave, punit;

        slave = sc->sc_slave;
        punit = sc->sc_punit;

        bp = bufq_peek(sc->sc_tab);
        if ((sc->sc_flags & CTF_CMD) && sc->sc_bp == bp) {
                switch(sc->sc_cmd) {
                case MTFSF:
                        bp->b_flags |= B_READ;
                        goto mustio;

                case MTBSF:
                        goto gotaddr;

                case MTOFFL:
                        sc->sc_blkno = 0;
                        ul.unit = CS80CMD_SUNIT(punit);
                        ul.cmd = CS80CMD_UNLOAD;
                        (void) cs80send(device_parent(&sc->sc_dev), slave,
                            punit, CS80CMD_SCMD, &ul, sizeof(ul));
                        break;

                case MTWEOF:
                        sc->sc_blkno++;
                        sc->sc_flags |= CTF_WRT;
                        wfm.unit = CS80CMD_SUNIT(sc->sc_punit);
                        wfm.cmd = CS80CMD_WFM;
                        (void) cs80send(device_parent(&sc->sc_dev), slave,
                            punit, CS80CMD_SCMD, &wfm, sizeof(wfm));
                        ctaddeof(sc);
                        break;

                case MTBSR:
                        sc->sc_blkno--;
                        goto gotaddr;

                case MTFSR:
                        sc->sc_blkno++;
                        goto gotaddr;

                case MTREW:
                        sc->sc_blkno = 0;
                        DPRINTF(CDB_BSF, ("%s: clearing eofs\n",
                            device_xname(&sc->sc_dev)));
                        for (i=0; i<EOFS; i++)
                                sc->sc_eofs[i] = 0;
                        sc->sc_eofp = 0;

gotaddr:
                        sc->sc_ioc.unit = CS80CMD_SUNIT(sc->sc_punit);
                        sc->sc_ioc.saddr = CS80CMD_SADDR;
                        sc->sc_ioc.addr0 = 0;
                        sc->sc_ioc.addr = htobe32(sc->sc_blkno);
                        sc->sc_ioc.nop2 = CS80CMD_NOP;
                        sc->sc_ioc.slen = CS80CMD_SLEN;
                        sc->sc_ioc.len = htobe32(0);
                        sc->sc_ioc.nop3 = CS80CMD_NOP;
                        sc->sc_ioc.cmd = CS80CMD_READ;
                        (void) cs80send(device_parent(&sc->sc_dev), slave,
                            punit, CS80CMD_SCMD, &sc->sc_ioc,
                            sizeof(sc->sc_ioc));
                        break;
                }
        } else {
mustio:
                if ((bp->b_flags & B_READ) &&
                    sc->sc_flags & (CTF_BEOF|CTF_EOT)) {
                        DPRINTF(CDB_FILES, ("ctstart: before %x\n",
                                    sc->sc_flags));
                        if (sc->sc_flags & CTF_BEOF) {
                                sc->sc_flags &= ~CTF_BEOF;
                                sc->sc_flags |= CTF_AEOF;
                                DPRINTF(CDB_FILES, ("ctstart: after %x\n",
                                    sc->sc_flags));
                        }
                        bp->b_resid = bp->b_bcount;
                        ctdone(sc, bp);
                        return;
                }
                sc->sc_flags |= CTF_IO;
                sc->sc_ioc.unit = CS80CMD_SUNIT(sc->sc_punit);
                sc->sc_ioc.saddr = CS80CMD_SADDR;
                sc->sc_ioc.addr0 = 0;
                sc->sc_ioc.addr = htobe32(sc->sc_blkno);
                sc->sc_ioc.nop2 = CS80CMD_NOP;
                sc->sc_ioc.slen = CS80CMD_SLEN;
                sc->sc_ioc.len = htobe32(sc->sc_resid);
                sc->sc_ioc.nop3 = CS80CMD_NOP;
                if (bp->b_flags & B_READ)
                        sc->sc_ioc.cmd = CS80CMD_READ;
                else {
                        sc->sc_ioc.cmd = CS80CMD_WRITE;
                        sc->sc_flags |= (CTF_WRT | CTF_WRTTN);
                }
                (void) cs80send(device_parent(&sc->sc_dev), slave, punit,
                    CS80CMD_SCMD, &sc->sc_ioc, sizeof(sc->sc_ioc));
        }
        gpibawait(sc->sc_ic);
}

/*
 * Hideous grue to handle EOF/EOT (mostly for reads)
 */
void
cteof(struct ct_softc *sc, struct buf *bp)
{
        long blks;

        /*
         * EOT on a write is an error.
         */
        if ((bp->b_flags & B_READ) == 0) {
                bp->b_resid = bp->b_bcount;
                bp->b_error = ENOSPC;
                sc->sc_flags |= CTF_EOT;
                return;
        }
        /*
         * Use returned block position to determine how many blocks
         * we really read and update b_resid.
         */
        blks = sc->sc_stat.c_blk - sc->sc_blkno - 1;
        DPRINTF(CDB_FILES, ("cteof: bc %d oblk %d nblk %d read %ld, resid %ld\n",
            bp->b_bcount, sc->sc_blkno, sc->sc_stat.c_blk,
            blks, bp->b_bcount - CTKTOB(blks)));
        if (blks == -1) { /* 9145 on EOF does not change sc_stat.c_blk */
                blks = 0;
                sc->sc_blkno++;
        }
        else {
                sc->sc_blkno = sc->sc_stat.c_blk;
        }
        bp->b_resid = bp->b_bcount - CTKTOB(blks);
        /*
         * If we are at physical EOV or were after an EOF,
         * we are now at logical EOT.
         */
        if ((sc->sc_stat.c_aef & AEF_EOV) ||
            (sc->sc_flags & CTF_AEOF)) {
                sc->sc_flags |= CTF_EOT;
                sc->sc_flags &= ~(CTF_AEOF|CTF_BEOF);
        }
        /*
         * If we were before an EOF or we have just completed a FSF,
         * we are now after EOF.
         */
        else if ((sc->sc_flags & CTF_BEOF) ||
                 ((sc->sc_flags & CTF_CMD) && sc->sc_cmd == MTFSF)) {
                sc->sc_flags |= CTF_AEOF;
                sc->sc_flags &= ~CTF_BEOF;
        }
        /*
         * Otherwise if we read something we are now before EOF
         * (and no longer after EOF).
         */
        else if (blks) {
                sc->sc_flags |= CTF_BEOF;
                sc->sc_flags &= ~CTF_AEOF;
        }
        /*
         * Finally, if we didn't read anything we just passed an EOF
         */
        else
                sc->sc_flags |= CTF_AEOF;
        DPRINTF(CDB_FILES, ("cteof: leaving flags %x\n", sc->sc_flags));
}


void
ctcallback(void *v, int action)
{
        struct ct_softc *sc = v;

        DPRINTF(CDB_FOLLOW, ("ctcallback: v=%p, action=%d\n", v, action));

        switch (action) {
        case GPIBCBF_START:
                ctstart(sc);
                break;
        case GPIBCBF_INTR:
                ctintr(sc);
                break;
#ifdef DEBUG
        default:
                DPRINTF(CDB_FAIL, ("ctcallback: unknown action %d\n", action));
                break;
#endif
        }
}

void
ctintr(struct ct_softc *sc)
{
        struct buf *bp;
        u_int8_t stat;
        int slave, punit;
        int dir;

        slave = sc->sc_slave;
        punit = sc->sc_punit;

        bp = bufq_peek(sc->sc_tab);
        if (bp == NULL) {
                aprint_error_dev(&sc->sc_dev, "bp == NULL\n");
                return;
        }
        if (sc->sc_flags & CTF_IO) {
                sc->sc_flags &= ~CTF_IO;
                dir = (bp->b_flags & B_READ ? GPIB_READ : GPIB_WRITE);
                gpibxfer(sc->sc_ic, slave, CS80CMD_EXEC, sc->sc_addr,
                    sc->sc_resid, dir, dir == GPIB_READ);
                return;
        }
        if ((sc->sc_flags & CTF_STATWAIT) == 0) {
                if (gpibpptest(sc->sc_ic, slave) == 0) {
                        sc->sc_flags |= CTF_STATWAIT;
                        gpibawait(sc->sc_ic);
                        return;
                }
        } else
                sc->sc_flags &= ~CTF_STATWAIT;
        (void) gpibrecv(sc->sc_ic, slave, CS80CMD_QSTAT, &stat, 1);
        DPRINTF(CDB_FILES, ("ctintr: before flags %x\n", sc->sc_flags));
        if (stat) {
                sc->sc_rsc.unit = CS80CMD_SUNIT(punit);
                sc->sc_rsc.cmd = CS80CMD_STATUS;
                (void) gpibsend(sc->sc_ic, slave, CS80CMD_SCMD, &sc->sc_rsc,
                    sizeof(sc->sc_rsc));
                (void) gpibrecv(sc->sc_ic, slave, CS80CMD_EXEC, &sc->sc_stat,
                    sizeof(sc->sc_stat));
                (void) gpibrecv(sc->sc_ic, slave, CS80CMD_QSTAT, &stat, 1);
                DPRINTF(CDB_FILES, ("ctintr: return stat 0x%x, A%x F%x blk %d\n",
                               stat, sc->sc_stat.c_aef,
                               sc->sc_stat.c_fef, sc->sc_stat.c_blk));
                if (stat == 0) {
                        if (sc->sc_stat.c_aef & (AEF_EOF | AEF_EOV)) {
                                cteof(sc, bp);
                                ctaddeof(sc);
                                goto done;
                        }
                        if (sc->sc_stat.c_fef & FEF_PF) {
                                cs80reset(sc, slave, punit);
                                ctstart(sc);
                                return;
                        }
                        if (sc->sc_stat.c_fef & FEF_REXMT) {
                                ctstart(sc);
                                return;
                        }
                        if (sc->sc_stat.c_aef & 0x5800) {
                                if (sc->sc_stat.c_aef & 0x4000)
                                        tprintf(sc->sc_tpr,
                                            "%s: uninitialized media\n",
                                            device_xname(&sc->sc_dev));
                                if (sc->sc_stat.c_aef & 0x1000)
                                        tprintf(sc->sc_tpr,
                                            "%s: not ready\n",
                                            device_xname(&sc->sc_dev));
                                if (sc->sc_stat.c_aef & 0x0800)
                                        tprintf(sc->sc_tpr,
                                            "%s: write protect\n",
                                            device_xname(&sc->sc_dev));
                        } else {
                                printf("%s err: v%d u%d ru%d bn%d, ",
                                    device_xname(&sc->sc_dev),
                                    (sc->sc_stat.c_vu>>4)&0xF,
                                    sc->sc_stat.c_vu&0xF,
                                    sc->sc_stat.c_pend,
                                    sc->sc_stat.c_blk);
                                printf("R0x%x F0x%x A0x%x I0x%x\n",
                                    sc->sc_stat.c_ref,
                                    sc->sc_stat.c_fef,
                                    sc->sc_stat.c_aef,
                                    sc->sc_stat.c_ief);
                        }
                } else
                        aprint_error_dev(&sc->sc_dev, "request status failed\n");
                bp->b_error = EIO;
                goto done;
        } else
                bp->b_resid = 0;
        if (sc->sc_flags & CTF_CMD) {
                switch (sc->sc_cmd) {
                case MTFSF:
                        sc->sc_flags &= ~(CTF_BEOF|CTF_AEOF);
                        sc->sc_blkno += CTBTOK(sc->sc_resid);
                        ctstart(sc);
                        return;
                case MTBSF:
                        sc->sc_flags &= ~(CTF_AEOF|CTF_BEOF|CTF_EOT);
                        break;
                case MTBSR:
                        sc->sc_flags &= ~CTF_BEOF;
                        if (sc->sc_flags & CTF_EOT) {
                                sc->sc_flags |= CTF_AEOF;
                                sc->sc_flags &= ~CTF_EOT;
                        } else if (sc->sc_flags & CTF_AEOF) {
                                sc->sc_flags |= CTF_BEOF;
                                sc->sc_flags &= ~CTF_AEOF;
                        }
                        break;
                case MTWEOF:
                        sc->sc_flags &= ~CTF_BEOF;
                        if (sc->sc_flags & (CTF_AEOF|CTF_EOT)) {
                                sc->sc_flags |= CTF_EOT;
                                sc->sc_flags &= ~CTF_AEOF;
                        } else
                                sc->sc_flags |= CTF_AEOF;
                        break;
                case MTREW:
                case MTOFFL:
                        sc->sc_flags &= ~(CTF_BEOF|CTF_AEOF|CTF_EOT);
                        break;
                }
        } else {
                sc->sc_flags &= ~CTF_AEOF;
                sc->sc_blkno += CTBTOK(sc->sc_resid);
        }
done:
        DPRINTF(CDB_FILES, ("ctintr: after flags %x\n", sc->sc_flags));
        ctdone(sc, bp);
}

void
ctdone(struct ct_softc *sc, struct buf *bp)
{

        (void)bufq_get(sc->sc_tab);
        biodone(bp);
        gpibrelease(sc->sc_ic, sc->sc_hdl);
        if (bufq_peek(sc->sc_tab) == NULL) {
                sc->sc_active = 0;
                return;
        }
        ctustart(sc);
}

int
ctread(dev_t dev, struct uio *uio, int flags)
{
        return (physio(ctstrategy, NULL, dev, B_READ, minphys, uio));
}

int
ctwrite(dev_t dev, struct uio *uio, int flags)
{
        /* XXX: check for hardware write-protect? */
        return (physio(ctstrategy, NULL, dev, B_WRITE, minphys, uio));
}

/*ARGSUSED*/
int
ctioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
{
        struct mtop *op;
        int cnt;

        switch (cmd) {

        case MTIOCTOP:
                op = (struct mtop *)data;
                switch(op->mt_op) {

                case MTWEOF:
                case MTFSF:
                case MTBSR:
                case MTBSF:
                case MTFSR:
                        cnt = op->mt_count;
                        break;

                case MTREW:
                case MTOFFL:
                        cnt = 1;
                        break;

                default:
                        return (EINVAL);
                }
                ctcommand(dev, op->mt_op, cnt);
                break;

        case MTIOCGET:
                break;

        default:
                return (EINVAL);
        }
        return (0);
}

void
ctaddeof(struct ct_softc *sc)
{

        if (sc->sc_eofp == EOFS - 1)
                sc->sc_eofs[EOFS - 1]++;
        else {
                sc->sc_eofp++;
                if (sc->sc_eofp == EOFS - 1)
                        sc->sc_eofs[EOFS - 1] = EOFS;
                else
                        /* save blkno */
                        sc->sc_eofs[sc->sc_eofp] = sc->sc_blkno - 1;
        }
        DPRINTF(CDB_BSF, ("%s: add eof pos %d blk %d\n",
                       device_xname(&sc->sc_dev), sc->sc_eofp,
                       sc->sc_eofs[sc->sc_eofp]));
}