* Copyright (c) 1996, 1997 The NetBSD Foundation, Inc.

/* $NetBSD: ct.c,v 1.64 2023/04/21 23:01:59 tsutsui Exp $ */

/*-
* Copyright (c) 1996, 1997 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.
*
* 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 8.2 (Berkeley) 1/12/94
*/

/*
* CS80 cartridge tape driver (9144, 88140, 9145)
*
* 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 cs80 disk driver
* finish support of 9145
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ct.c,v 1.64 2023/04/21 23:01:59 tsutsui 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 <hp300/dev/hpibvar.h>

#include <hp300/dev/ctreg.h>

#include "ioconf.h"

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

struct ct_softc {
device_t sc_dev;
int sc_slave; /* HP-IB slave ID */
int sc_punit; /* physical unit */
struct ct_iocmd sc_ioc;
struct ct_rscmd sc_rsc;
struct ct_stat sc_stat;
struct ct_ssmcmd sc_ssmc;
struct ct_srcmd sc_src;
struct ct_soptcmd sc_soptc;
struct ct_ulcmd sc_ul;
struct ct_wfmcmd sc_wfm;
struct ct_clearcmd sc_clear;
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;
short sc_type;
tpr_t sc_tpr;
struct hpibqueue sc_hq; /* entry on hpib job queue */
int sc_eofp;
int sc_eofs[EOFS];
};

/* 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

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

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

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

const struct bdevsw ct_bdevsw = {
.d_open = ctopen,
.d_close = ctclose,
.d_strategy = ctstrategy,
.d_ioctl = ctioctl,
.d_dump = nodump,
.d_psize = nosize,
.d_discard = nodiscard,
.d_flag = D_TAPE
};

const struct cdevsw ct_cdevsw = {
.d_open = ctopen,
.d_close = ctclose,
.d_read = ctread,
.d_write = ctwrite,
.d_ioctl = ctioctl,
.d_stop = nostop,
.d_tty = notty,
.d_poll = nopoll,
.d_mmap = nommap,
.d_kqfilter = nokqfilter,
.d_discard = nodiscard,
.d_flag = D_TAPE
};

static int ctident(device_t, struct ct_softc *,
struct hpibbus_attach_args *);

static void ctreset(struct ct_softc *);
static void ctaddeof(struct ct_softc *);
static void ctustart(struct ct_softc *);
static void cteof(struct ct_softc *, struct buf *);
static void ctdone(struct ct_softc *, struct buf *);

static void ctstart(void *);
static void ctgo(void *);
static void ctintr(void *);

static void ctcommand(dev_t, int, int);

static const 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"},
};
static const int nctinfo = __arraycount(ctinfo);

#define CT_NOREW 4
#define CT_STREAM 8
#define UNIT(x) (minor(x) & 3)
#define ctpunit(x) ((x) & 7)

#ifdef DEBUG
int ctdebug = 0;
#define CDB_FILES 0x01
#define CT_BSF 0x02
#endif

static int
ctmatch(device_t parent, cfdata_t cf, void *aux)
{
struct hpibbus_attach_args *ha = aux;

return ctident(parent, NULL, ha);
}

static void
ctattach(device_t parent, device_t self, void *aux)
{
struct ct_softc *sc = device_private(self);
struct hpibbus_attach_args *ha = aux;

sc->sc_dev = self;
if (ctident(parent, sc, ha) == 0) {
aprint_error(": didn't respond to describe command!\n");
return;
}

sc->sc_slave = ha->ha_slave;
sc->sc_punit = ha->ha_punit;

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

/* Initialize hpib job queue entry. */
sc->sc_hq.hq_softc = sc;
sc->sc_hq.hq_slave = sc->sc_slave;
sc->sc_hq.hq_start = ctstart;
sc->sc_hq.hq_go = ctgo;
sc->sc_hq.hq_intr = ctintr;

ctreset(sc);
sc->sc_flags |= CTF_ALIVE;
}

static int
ctident(device_t parent, struct ct_softc *sc, struct hpibbus_attach_args *ha)
{
struct cs80_describe desc;
u_char stat, cmd[3];
char name[7];
int i, id, n, type, canstream;

type = canstream = 0;

/* Verify that we have a CS80 device. */
if ((ha->ha_id & 0x200) == 0)
return 0;

/* Is it one of the tapes we support? */
for (id = 0; id < nctinfo; id++)
if (ha->ha_id == ctinfo[id].hwid &&
ha->ha_punit == ctinfo[id].punit)
break;
if (id == nctinfo)
return 0;

/*
* So far, so good. Get drive parameters. Note command
* is always issued to unit 0.
*/
cmd[0] = C_SUNIT(0);
cmd[1] = C_SVOL(0);
cmd[2] = C_DESC;
hpibsend(device_unit(parent), ha->ha_slave, C_CMD, cmd, sizeof(cmd));
hpibrecv(device_unit(parent), ha->ha_slave, C_EXEC, &desc,
sizeof(desc));
hpibrecv(device_unit(parent), ha->ha_slave, C_QSTAT, &stat,
sizeof(stat));

memset(name, 0, sizeof(name));
if (stat == 0) {
n = desc.d_name;
for (i = 5; i >= 0; i--) {
name[i] = (n & 0xf) + '0';
n >>= 4;
}
}

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

case CT7912PID:
case CT7914PID:
type = CT88140;
break;
}

if (sc != NULL) {
sc->sc_type = type;
sc->sc_flags = canstream ? CTF_CANSTREAM : 0;
aprint_normal(": %s %stape\n", ctinfo[id].desc,
canstream ? "streaming " : "");
}

return 1;
}

static void
ctreset(struct ct_softc *sc)
{
int ctlr, slave;
uint8_t stat;

ctlr = device_unit(device_parent(sc->sc_dev));
slave = sc->sc_slave;

sc->sc_clear.unit = C_SUNIT(sc->sc_punit);
sc->sc_clear.cmd = C_CLEAR;
hpibsend(ctlr, slave, C_TCMD, &sc->sc_clear, sizeof(sc->sc_clear));
hpibswait(ctlr, slave);
hpibrecv(ctlr, slave, C_QSTAT, &stat, sizeof(stat));

sc->sc_src.unit = C_SUNIT(CTCTLR);
sc->sc_src.nop = C_NOP;
sc->sc_src.cmd = C_SREL;
sc->sc_src.param = C_REL;
hpibsend(ctlr, slave, C_CMD, &sc->sc_src, sizeof(sc->sc_src));
hpibswait(ctlr, slave);
hpibrecv(ctlr, slave, C_QSTAT, &stat, sizeof(stat));

sc->sc_ssmc.unit = C_SUNIT(sc->sc_punit);
sc->sc_ssmc.cmd = C_SSM;
sc->sc_ssmc.refm = REF_MASK;
sc->sc_ssmc.fefm = FEF_MASK;
sc->sc_ssmc.aefm = AEF_MASK;
sc->sc_ssmc.iefm = IEF_MASK;
hpibsend(ctlr, slave, C_CMD, &sc->sc_ssmc, sizeof(sc->sc_ssmc));
hpibswait(ctlr, slave);
hpibrecv(ctlr, slave, C_QSTAT, &stat, sizeof(stat));

sc->sc_soptc.unit = C_SUNIT(sc->sc_punit);
sc->sc_soptc.nop = C_NOP;
sc->sc_soptc.cmd = C_SOPT;
sc->sc_soptc.opt = C_SPAR;
hpibsend(ctlr, slave, C_CMD, &sc->sc_soptc, sizeof(sc->sc_soptc));
hpibswait(ctlr, slave);
hpibrecv(ctlr, slave, C_QSTAT, &stat, sizeof(stat));
}

static int
ctopen(dev_t dev, int flag, int type, struct lwp *l)
{
struct ct_softc *sc;
uint8_t stat;
int cc, ctlr, slave;

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

if ((sc->sc_flags & CTF_ALIVE) == 0)
return ENXIO;

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

ctlr = device_unit(device_parent(sc->sc_dev));
slave = sc->sc_slave;

sc->sc_soptc.unit = C_SUNIT(sc->sc_punit);
sc->sc_soptc.nop = C_NOP;
sc->sc_soptc.cmd = C_SOPT;
if ((dev & CT_STREAM) && (sc->sc_flags & CTF_CANSTREAM))
sc->sc_soptc.opt = C_SPAR | C_IMRPT;
else
sc->sc_soptc.opt = C_SPAR;

/*
* Check the return of hpibsend() and hpibswait().
* Drive could be loading/unloading a tape. If not checked,
* driver hangs.
*/
cc = hpibsend(ctlr, slave, C_CMD, &sc->sc_soptc, sizeof(sc->sc_soptc));
if (cc != sizeof(sc->sc_soptc))
return EBUSY;

hpibswait(ctlr, slave);
cc = hpibrecv(ctlr, slave, C_QSTAT, &stat, sizeof(stat));
if (cc != sizeof(stat))
return EBUSY;

sc->sc_tpr = tprintf_open(l->l_proc);
sc->sc_flags |= CTF_OPEN;
return 0;
}

static int
ctclose(dev_t dev, int flag, int fmt, struct lwp *l)
{
struct ct_softc *sc = device_lookup_private(&ct_cd,UNIT(dev));

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--;
#ifdef DEBUG
if(ctdebug & CT_BSF)
printf("%s: ctclose backup eofs prt %d blk %d\n",
device_xname(sc->sc_dev), sc->sc_eofp,
sc->sc_eofs[sc->sc_eofp]);
#endif
}
if ((minor(dev) & CT_NOREW) == 0)
ctcommand(dev, MTREW, 1);
sc->sc_flags &= ~(CTF_OPEN | CTF_WRT | CTF_WRTTN);
tprintf_close(sc->sc_tpr);
#ifdef DEBUG
if (ctdebug & CDB_FILES)
printf("ctclose: flags %x\n", sc->sc_flags);
#endif
return 0; /* XXX */
}

static void
ctcommand(dev_t dev, int cmd, int cnt)
{
struct ct_softc *sc = device_lookup_private(&ct_cd,UNIT(dev));
struct buf *bp = &sc->sc_bufstore;
struct buf *nbp = 0;

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;
if (cmd == MTFSF) {
nbp = (struct buf *)geteblk(MAXBSIZE);
bp->b_data = nbp->b_data;
bp->b_bcount = MAXBSIZE;
}

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

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

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

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

static 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 (hpibreq(device_parent(sc->sc_dev), &sc->sc_hq))
ctstart(sc);
}

static void
ctstart(void *arg)
{
struct ct_softc *sc = arg;
struct buf *bp;
int i, ctlr, slave;

ctlr = device_unit(device_parent(sc->sc_dev));
slave = sc->sc_slave;

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;
sc->sc_ul.unit = C_SUNIT(sc->sc_punit);
sc->sc_ul.cmd = C_UNLOAD;
hpibsend(ctlr, slave, C_CMD, &sc->sc_ul,
sizeof(sc->sc_ul));
break;

case MTWEOF:
sc->sc_blkno++;
sc->sc_flags |= CTF_WRT;
sc->sc_wfm.unit = C_SUNIT(sc->sc_punit);
sc->sc_wfm.cmd = C_WFM;
hpibsend(ctlr, slave, C_CMD, &sc->sc_wfm,
sizeof(sc->sc_wfm));
ctaddeof(sc);
break;

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

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

case MTREW:
sc->sc_blkno = 0;
#ifdef DEBUG
if(ctdebug & CT_BSF)
printf("%s: clearing eofs\n",
device_xname(sc->sc_dev));
#endif
for (i=0; i<EOFS; i++)
sc->sc_eofs[i] = 0;
sc->sc_eofp = 0;

gotaddr:
sc->sc_ioc.saddr = C_SADDR;
sc->sc_ioc.addr0 = 0;
sc->sc_ioc.addr = sc->sc_blkno;
sc->sc_ioc.unit = C_SUNIT(sc->sc_punit);
sc->sc_ioc.nop2 = C_NOP;
sc->sc_ioc.slen = C_SLEN;
sc->sc_ioc.len = 0;
sc->sc_ioc.nop3 = C_NOP;
sc->sc_ioc.cmd = C_READ;
hpibsend(ctlr, slave, C_CMD, &sc->sc_ioc,
sizeof(sc->sc_ioc));
break;
}
} else {
mustio:
if ((bp->b_flags & B_READ) &&
sc->sc_flags & (CTF_BEOF|CTF_EOT)) {
#ifdef DEBUG
if (ctdebug & CDB_FILES)
printf("ctstart: before flags %x\n",
sc->sc_flags);
#endif
if (sc->sc_flags & CTF_BEOF) {
sc->sc_flags &= ~CTF_BEOF;
sc->sc_flags |= CTF_AEOF;
#ifdef DEBUG
if (ctdebug & CDB_FILES)
printf("ctstart: after flags %x\n",
sc->sc_flags);
#endif
}
bp->b_resid = bp->b_bcount;
ctdone(sc, bp);
return;
}
sc->sc_flags |= CTF_IO;
sc->sc_ioc.unit = C_SUNIT(sc->sc_punit);
sc->sc_ioc.saddr = C_SADDR;
sc->sc_ioc.addr0 = 0;
sc->sc_ioc.addr = sc->sc_blkno;
sc->sc_ioc.nop2 = C_NOP;
sc->sc_ioc.slen = C_SLEN;
sc->sc_ioc.len = sc->sc_resid;
sc->sc_ioc.nop3 = C_NOP;
if (bp->b_flags & B_READ)
sc->sc_ioc.cmd = C_READ;
else {
sc->sc_ioc.cmd = C_WRITE;
sc->sc_flags |= (CTF_WRT | CTF_WRTTN);
}
hpibsend(ctlr, slave, C_CMD, &sc->sc_ioc, sizeof(sc->sc_ioc));
}
hpibawait(ctlr);
}

static void
ctgo(void *arg)
{
struct ct_softc *sc = arg;
struct buf *bp;
int rw;

bp = bufq_peek(sc->sc_tab);
rw = bp->b_flags & B_READ;
hpibgo(device_unit(device_parent(sc->sc_dev)), sc->sc_slave, C_EXEC,
sc->sc_addr, sc->sc_resid, rw, rw != 0);
}

/*
* Hideous grue to handle EOF/EOT (mostly for reads)
*/
static 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;
#ifdef DEBUG
if (ctdebug & CDB_FILES)
printf("cteof: bc %d oblk %d nblk %ld read %ld, resid %ld\n",
bp->b_bcount, sc->sc_blkno, sc->sc_stat.c_blk,
blks, bp->b_bcount - CTKTOB(blks));
#endif
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;
#ifdef DEBUG
if (ctdebug & CDB_FILES)
printf("cteof: leaving flags %x\n", sc->sc_flags);
#endif
}

static void
ctintr(void *arg)
{
struct ct_softc *sc = arg;
struct buf *bp;
uint8_t stat;
int ctlr, slave;

ctlr = device_unit(device_parent(sc->sc_dev));
slave = sc->sc_slave;

bp = bufq_peek(sc->sc_tab);
if (bp == NULL) {
printf("%s: bp == NULL\n", device_xname(sc->sc_dev));
return;
}
if (sc->sc_flags & CTF_IO) {
sc->sc_flags &= ~CTF_IO;
if (hpibustart(ctlr))
ctgo(sc);
return;
}
if ((sc->sc_flags & CTF_STATWAIT) == 0) {
if (hpibpptest(ctlr, slave) == 0) {
sc->sc_flags |= CTF_STATWAIT;
hpibawait(ctlr);
return;
}
} else
sc->sc_flags &= ~CTF_STATWAIT;
hpibrecv(ctlr, slave, C_QSTAT, &stat, 1);
#ifdef DEBUG
if (ctdebug & CDB_FILES)
printf("ctintr: before flags %x\n", sc->sc_flags);
#endif
if (stat) {
sc->sc_rsc.unit = C_SUNIT(sc->sc_punit);
sc->sc_rsc.cmd = C_STATUS;
hpibsend(ctlr, slave, C_CMD, &sc->sc_rsc, sizeof(sc->sc_rsc));
hpibrecv(ctlr, slave, C_EXEC, &sc->sc_stat,
sizeof(sc->sc_stat));
hpibrecv(ctlr, slave, C_QSTAT, &stat, 1);
#ifdef DEBUG
if (ctdebug & CDB_FILES)
printf("ctintr: return stat 0x%x, A%x F%x blk %ld\n",
stat, sc->sc_stat.c_aef,
sc->sc_stat.c_fef, sc->sc_stat.c_blk);
#endif
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) {
ctreset(sc);
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%ld, ",
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
printf("%s: request status failed\n",
device_xname(sc->sc_dev));
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:
#ifdef DEBUG
if (ctdebug & CDB_FILES)
printf("ctintr: after flags %x\n", sc->sc_flags);
#endif
ctdone(sc, bp);
}

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

(void)bufq_get(sc->sc_tab);
biodone(bp);
hpibfree(device_parent(sc->sc_dev), &sc->sc_hq);
if (bufq_peek(sc->sc_tab) == NULL) {
sc->sc_active = 0;
return;
}
ctustart(sc);
}

static int
ctread(dev_t dev, struct uio *uio, int flags)
{

return physio(ctstrategy, NULL, dev, B_READ, minphys, uio);
}

static 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);
}

static 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;
}

static 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;
}
#ifdef DEBUG
if (ctdebug & CT_BSF)
printf("%s: add eof pos %d blk %d\n",
device_xname(sc->sc_dev), sc->sc_eofp,
sc->sc_eofs[sc->sc_eofp]);
#endif
}