* Copyright (c) 1996-2003 The NetBSD Foundation, Inc.

/* $NetBSD: rd.c,v 1.45 2023/02/12 16:04:57 andvar 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) 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 $Hdr: rd.c 1.44 92/12/26$
*
* @(#)rd.c 8.2 (Berkeley) 5/19/94
*/

/*
* CS80/SS80 disk driver
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: rd.c,v 1.45 2023/02/12 16:04:57 andvar Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/bufq.h>
#include <sys/callout.h>
#include <sys/conf.h>
#include <sys/device.h>
#include <sys/disk.h>
#include <sys/disklabel.h>
#include <sys/endian.h>
#include <sys/fcntl.h>
#include <sys/ioctl.h>
#include <sys/proc.h>
#include <sys/stat.h>

#include <sys/rndsource.h>

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

#include <dev/gpib/rdreg.h>

#include "ioconf.h"

#ifdef DEBUG
int rddebug = 0xff;
#define RDB_FOLLOW 0x01
#define RDB_STATUS 0x02
#define RDB_IDENT 0x04
#define RDB_IO 0x08
#define RDB_ASYNC 0x10
#define RDB_ERROR 0x80
#define DPRINTF(mask, str) if (rddebug & (mask)) printf str
#else
#define DPRINTF(mask, str) /* nothing */
#endif

struct rd_softc {
device_t sc_dev;
gpib_chipset_tag_t sc_ic;
gpib_handle_t sc_hdl;

struct disk sc_dk;

int sc_slave; /* GPIB slave */
int sc_punit; /* physical unit on slave */

int sc_flags;
#define RDF_ALIVE 0x01
#define RDF_SEEK 0x02
#define RDF_SWAIT 0x04
#define RDF_OPENING 0x08
#define RDF_CLOSING 0x10
#define RDF_WANTED 0x20
#define RDF_WLABEL 0x40

u_int16_t sc_type;
u_int8_t *sc_addr;
int sc_resid;
struct rd_iocmd sc_ioc;
struct bufq_state *sc_tab;
int sc_active;
int sc_errcnt;

struct callout sc_restart_ch;

krndsource_t rnd_source;
};

#define RDUNIT(dev) DISKUNIT(dev)
#define RDPART(dev) DISKPART(dev)
#define RDMAKEDEV(maj, unit, part) MAKEDISKDEV(maj, unit, part)
#define RDLABELDEV(dev) (RDMAKEDEV(major(dev), RDUNIT(dev), RAW_PART))

#define RDRETRY 5
#define RDWAITC 1 /* min time for timeout in seconds */

int rderrthresh = RDRETRY-1; /* when to start reporting errors */

/*
* Misc. HW description, indexed by sc_type.
* Used for mapping 256-byte sectors for 512-byte sectors
*/
const struct rdidentinfo {
u_int16_t ri_hwid; /* 2 byte HW id */
u_int16_t ri_maxunum; /* maximum allowed unit number */
const char *ri_desc; /* drive type description */
int ri_nbpt; /* DEV_BSIZE blocks per track */
int ri_ntpc; /* tracks per cylinder */
int ri_ncyl; /* cylinders per unit */
int ri_nblocks; /* DEV_BSIZE blocks on disk */
} rdidentinfo[] = {
{ RD7946AID, 0, "7945A", NRD7945ABPT,
NRD7945ATRK, 968, 108416 },

{ RD9134DID, 1, "9134D", NRD9134DBPT,
NRD9134DTRK, 303, 29088 },

{ RD9134LID, 1, "9122S", NRD9122SBPT,
NRD9122STRK, 77, 1232 },

{ RD7912PID, 0, "7912P", NRD7912PBPT,
NRD7912PTRK, 572, 128128 },

{ RD7914PID, 0, "7914P", NRD7914PBPT,
NRD7914PTRK, 1152, 258048 },

{ RD7958AID, 0, "7958A", NRD7958ABPT,
NRD7958ATRK, 1013, 255276 },

{ RD7957AID, 0, "7957A", NRD7957ABPT,
NRD7957ATRK, 1036, 159544 },

{ RD7933HID, 0, "7933H", NRD7933HBPT,
NRD7933HTRK, 1321, 789958 },

{ RD9134LID, 1, "9134L", NRD9134LBPT,
NRD9134LTRK, 973, 77840 },

{ RD7936HID, 0, "7936H", NRD7936HBPT,
NRD7936HTRK, 698, 600978 },

{ RD7937HID, 0, "7937H", NRD7937HBPT,
NRD7937HTRK, 698, 1116102 },

{ RD7914CTID, 0, "7914CT", NRD7914PBPT,
NRD7914PTRK, 1152, 258048 },

{ RD7946AID, 0, "7946A", NRD7945ABPT,
NRD7945ATRK, 968, 108416 },

{ RD9134LID, 1, "9122D", NRD9122SBPT,
NRD9122STRK, 77, 1232 },

{ RD7957BID, 0, "7957B", NRD7957BBPT,
NRD7957BTRK, 1269, 159894 },

{ RD7958BID, 0, "7958B", NRD7958BBPT,
NRD7958BTRK, 786, 297108 },

{ RD7959BID, 0, "7959B", NRD7959BBPT,
NRD7959BTRK, 1572, 594216 },

{ RD2200AID, 0, "2200A", NRD2200ABPT,
NRD2200ATRK, 1449, 654948 },

{ RD2203AID, 0, "2203A", NRD2203ABPT,
NRD2203ATRK, 1449, 1309896 }
};
int numrdidentinfo = sizeof(rdidentinfo) / sizeof(rdidentinfo[0]);

int rdlookup(int, int, int);
int rdgetinfo(struct rd_softc *);
void rdrestart(void *);
struct buf *rdfinish(struct rd_softc *, struct buf *);

void rdgetcompatlabel(struct rd_softc *, struct disklabel *);
void rdgetdefaultlabel(struct rd_softc *, struct disklabel *);
void rdrestart(void *);
void rdustart(struct rd_softc *);
struct buf *rdfinish(struct rd_softc *, struct buf *);
void rdcallback(void *, int);
void rdstart(struct rd_softc *);
void rdintr(struct rd_softc *);
int rderror(struct rd_softc *);

int rdmatch(device_t, cfdata_t, void *);
void rdattach(device_t, device_t, void *);

CFATTACH_DECL_NEW(rd, sizeof(struct rd_softc),
rdmatch, rdattach, NULL, NULL);

dev_type_open(rdopen);
dev_type_close(rdclose);
dev_type_read(rdread);
dev_type_write(rdwrite);
dev_type_ioctl(rdioctl);
dev_type_strategy(rdstrategy);
dev_type_dump(rddump);
dev_type_size(rdsize);

const struct bdevsw rd_bdevsw = {
.d_open = rdopen,
.d_close = rdclose,
.d_strategy = rdstrategy,
.d_ioctl = rdioctl,
.d_dump = rddump,
.d_psize = rdsize,
.d_discard = nodiscard,
.d_flag = D_DISK
};

const struct cdevsw rd_cdevsw = {
.d_open = rdopen,
.d_close = rdclose,
.d_read = rdread,
.d_write = rdwrite,
.d_ioctl = rdioctl,
.d_stop = nostop,
.d_tty = notty,
.d_poll = nopoll,
.d_mmap = nommap,
.d_kqfilter = nokqfilter,
.d_discard = nodiscard,
.d_flag = D_DISK
};

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

for (i = 0; i < numrdidentinfo; i++) {
if (rdidentinfo[i].ri_hwid == id)
break;
}
if (i == numrdidentinfo || punit > rdidentinfo[i].ri_maxunum)
return (-1);
return (i);
}

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

if (rdlookup(ca->ca_id, ca->ca_slave, ca->ca_punit) < 0)
return (0);
return (1);
}

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

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

if ((type = rdlookup(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 (rddebug & RDB_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

/*
* 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 (ca->ca_id) {
case RD7946AID:
if (memcmp(name, "079450", 6) == 0)
type = RD7945A;
else
type = RD7946A;
break;

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

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

sc->sc_type = type;

/*
* XXX We use DEV_BSIZE instead of the sector size value pulled
* XXX off the driver because all of this code assumes 512 byte
* XXX blocks. ICK!
*/
printf(": %s\n", rdidentinfo[type].ri_desc);
printf("%s: %d cylinders, %d heads, %d blocks, %d bytes/block\n",
device_xname(sc->sc_dev), rdidentinfo[type].ri_ncyl,
rdidentinfo[type].ri_ntpc, rdidentinfo[type].ri_nblocks,
DEV_BSIZE);

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

/*
* Initialize and attach the disk structure.
*/
memset(&sc->sc_dk, 0, sizeof(sc->sc_dk));
disk_init(&sc->sc_dk, device_xname(sc->sc_dev), NULL);
disk_attach(&sc->sc_dk);

callout_init(&sc->sc_restart_ch, 0);

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

sc->sc_flags = RDF_ALIVE;
#ifdef DEBUG
/* always report errors */
if (rddebug & RDB_ERROR)
rderrthresh = 0;
#endif
/*
* attach the device into the random source list
*/
rnd_attach_source(&sc->rnd_source, device_xname(sc->sc_dev),
RND_TYPE_DISK, RND_FLAG_DEFAULT);
}

/*
* Read or construct a disklabel
*/
int
rdgetinfo(struct rd_softc *sc)
{
struct disklabel *lp = sc->sc_dk.dk_label;
struct partition *pi;
const char *msg;

memset(sc->sc_dk.dk_cpulabel, 0, sizeof(struct cpu_disklabel));

rdgetdefaultlabel(sc, lp);

/*
* Call the generic disklabel extraction routine
*/
msg = readdisklabel(RDMAKEDEV(0, device_unit(sc->sc_dev), RAW_PART),
rdstrategy, lp, NULL);
if (msg == NULL)
return (0);

pi = lp->d_partitions;
printf("%s: WARNING: %s\n", device_xname(sc->sc_dev), msg);

pi[RAW_PART].p_size = rdidentinfo[sc->sc_type].ri_nblocks;
lp->d_npartitions = RAW_PART+1;
pi[0].p_size = 0;

return (0);
}

int
rdopen(dev_t dev, int flags, int mode, struct lwp *l)
{
struct rd_softc *sc;
int error, mask, part;

sc = device_lookup_private(&rd_cd, RDUNIT(dev));
if (sc == NULL || (sc->sc_flags & RDF_ALIVE) ==0)
return (ENXIO);

/*
* Wait for any pending opens/closes to complete
*/
while (sc->sc_flags & (RDF_OPENING | RDF_CLOSING))
(void) tsleep(sc, PRIBIO, "rdopen", 0);

/*
* On first open, get label and partition info.
* We may block reading the label, so be careful
* to stop any other opens.
*/
if (sc->sc_dk.dk_openmask == 0) {
sc->sc_flags |= RDF_OPENING;
error = rdgetinfo(sc);
sc->sc_flags &= ~RDF_OPENING;
wakeup((void *)sc);
if (error)
return (error);
}

part = RDPART(dev);
mask = 1 << part;

/* Check that the partition exists. */
if (part != RAW_PART && (part > sc->sc_dk.dk_label->d_npartitions ||
sc->sc_dk.dk_label->d_partitions[part].p_fstype == FS_UNUSED))
return (ENXIO);

/* Ensure only one open at a time. */
switch (mode) {
case S_IFCHR:
sc->sc_dk.dk_copenmask |= mask;
break;
case S_IFBLK:
sc->sc_dk.dk_bopenmask |= mask;
break;
}
sc->sc_dk.dk_openmask =
sc->sc_dk.dk_copenmask | sc->sc_dk.dk_bopenmask;

return (0);
}

int
rdclose(dev_t dev, int flag, int mode, struct lwp *l)
{
struct rd_softc *sc;
struct disk *dk;
int mask, s;

sc = device_lookup_private(&rd_cd, RDUNIT(dev));
if (sc == NULL)
return (ENXIO);

dk = &sc->sc_dk;

mask = 1 << RDPART(dev);
if (mode == S_IFCHR)
dk->dk_copenmask &= ~mask;
else
dk->dk_bopenmask &= ~mask;
dk->dk_openmask = dk->dk_copenmask | dk->dk_bopenmask;
/*
* On last close, we wait for all activity to cease since
* the label/partition info will become invalid. Since we
* might sleep, we must block any opens while we are here.
* Note we don't have to about other closes since we know
* we are the last one.
*/
if (dk->dk_openmask == 0) {
sc->sc_flags |= RDF_CLOSING;
s = splbio();
while (sc->sc_active) {
sc->sc_flags |= RDF_WANTED;
(void) tsleep(&sc->sc_tab, PRIBIO, "rdclose", 0);
}
splx(s);
sc->sc_flags &= ~(RDF_CLOSING | RDF_WLABEL);
wakeup((void *)sc);
}
return (0);
}

void
rdstrategy(struct buf *bp)
{
struct rd_softc *sc;
struct partition *pinfo;
daddr_t bn;
int sz, s;
int offset;

sc = device_lookup_private(&rd_cd, RDUNIT(bp->b_dev));

DPRINTF(RDB_FOLLOW,
("rdstrategy(%p): dev %" PRIx64 ", bn %" PRId64 ", bcount %d, %c\n",
bp, bp->b_dev, bp->b_blkno, bp->b_bcount,
(bp->b_flags & B_READ) ? 'R' : 'W'));

bn = bp->b_blkno;
sz = howmany(bp->b_bcount, DEV_BSIZE);
pinfo = &sc->sc_dk.dk_label->d_partitions[RDPART(bp->b_dev)];

/* Don't perform partition translation on RAW_PART. */
offset = (RDPART(bp->b_dev) == RAW_PART) ? 0 : pinfo->p_offset;

if (RDPART(bp->b_dev) != RAW_PART) {
/*
* XXX This block of code belongs in
* XXX bounds_check_with_label()
*/

if (bn < 0 || bn + sz > pinfo->p_size) {
sz = pinfo->p_size - bn;
if (sz == 0) {
bp->b_resid = bp->b_bcount;
goto done;
}
if (sz < 0) {
bp->b_error = EINVAL;
goto done;
}
bp->b_bcount = dbtob(sz);
}
/*
* Check for write to write protected label
*/
if (bn + offset <= LABELSECTOR &&
#if LABELSECTOR != 0
bn + offset + sz > LABELSECTOR &&
#endif
!(bp->b_flags & B_READ) && !(sc->sc_flags & RDF_WLABEL)) {
bp->b_error = EROFS;
goto done;
}
}
bp->b_rawblkno = bn + offset;
s = splbio();
bufq_put(sc->sc_tab, bp);
if (sc->sc_active == 0) {
sc->sc_active = 1;
rdustart(sc);
}
splx(s);
return;
done:
biodone(bp);
}

/*
* Called from timeout() when handling maintenance releases
* callout from timeouts
*/
void
rdrestart(void *arg)
{
int s = splbio();
rdustart((struct rd_softc *)arg);
splx(s);
}

/* called by rdstrategy() to start a block transfer */
/* called by rdrestart() when handingly timeouts */
/* called by rdintr() */
void
rdustart(struct rd_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))
rdstart(sc);
}

struct buf *
rdfinish(struct rd_softc *sc, struct buf *bp)
{

sc->sc_errcnt = 0;
(void)bufq_get(sc->sc_tab);
bp->b_resid = 0;
biodone(bp);
gpibrelease(sc->sc_ic, sc->sc_hdl);
if ((bp = bufq_peek(sc->sc_tab)) != NULL)
return (bp);
sc->sc_active = 0;
if (sc->sc_flags & RDF_WANTED) {
sc->sc_flags &= ~RDF_WANTED;
wakeup((void *)&sc->sc_tab);
}
return (NULL);
}

void
rdcallback(void *v, int action)
{
struct rd_softc *sc = v;

DPRINTF(RDB_FOLLOW, ("rdcallback: v=%p, action=%d\n", v, action));

switch (action) {
case GPIBCBF_START:
rdstart(sc);
break;
case GPIBCBF_INTR:
rdintr(sc);
break;
#ifdef DEBUG
default:
DPRINTF(RDB_ERROR, ("rdcallback: unknown action %d\n",
action));
break;
#endif
}
}

/* called from rdustart() to start a transfer */
/* called from gpib interface as the initiator */
void
rdstart(struct rd_softc *sc)
{
struct buf *bp = bufq_peek(sc->sc_tab);
int slave, punit;

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

DPRINTF(RDB_FOLLOW, ("rdstart(%s): bp %p, %c\n",
device_xname(sc->sc_dev), bp, (bp->b_flags & B_READ) ? 'R' : 'W'));

again:

sc->sc_flags |= RDF_SEEK;
sc->sc_ioc.c_unit = CS80CMD_SUNIT(punit);
sc->sc_ioc.c_volume = CS80CMD_SVOL(0);
sc->sc_ioc.c_saddr = CS80CMD_SADDR;
sc->sc_ioc.c_hiaddr = htobe16(0);
sc->sc_ioc.c_addr = htobe32(RDBTOS(bp->b_rawblkno));
sc->sc_ioc.c_nop2 = CS80CMD_NOP;
sc->sc_ioc.c_slen = CS80CMD_SLEN;
sc->sc_ioc.c_len = htobe32(sc->sc_resid);
sc->sc_ioc.c_cmd = bp->b_flags & B_READ ? CS80CMD_READ : CS80CMD_WRITE;

if (gpibsend(sc->sc_ic, slave, CS80CMD_SCMD, &sc->sc_ioc.c_unit,
sizeof(sc->sc_ioc)-1) == sizeof(sc->sc_ioc)-1) {
/* Instrumentation. */
disk_busy(&sc->sc_dk);
iostat_seek(sc->sc_dk.dk_stats);
gpibawait(sc->sc_ic);
return;
}
/*
* Experience has shown that the gpibwait in this gpibsend will
* occasionally timeout. It appears to occur mostly on old 7914
* drives with full maintenance tracks. We should probably
* integrate this with the backoff code in rderror.
*/

DPRINTF(RDB_ERROR,
("rdstart: cmd %x adr %ul blk %" PRId64 " len %d ecnt %d\n",
sc->sc_ioc.c_cmd, sc->sc_ioc.c_addr, bp->b_blkno, sc->sc_resid,
sc->sc_errcnt));

sc->sc_flags &= ~RDF_SEEK;
cs80reset(device_parent(sc->sc_dev), slave, punit);
if (sc->sc_errcnt++ < RDRETRY)
goto again;
printf("%s: rdstart err: cmd 0x%x sect %uld blk %" PRId64 " len %d\n",
device_xname(sc->sc_dev), sc->sc_ioc.c_cmd, sc->sc_ioc.c_addr,
bp->b_blkno, sc->sc_resid);
bp->b_error = EIO;
bp = rdfinish(sc, bp);
if (bp) {
sc->sc_addr = bp->b_data;
sc->sc_resid = bp->b_bcount;
if (gpibrequest(sc->sc_ic, sc->sc_hdl))
goto again;
}
}

void
rdintr(struct rd_softc *sc)
{
struct buf *bp;
u_int8_t stat = 13; /* in case gpibrecv fails */
int rv, dir, restart, slave;

slave = sc->sc_slave;
bp = bufq_peek(sc->sc_tab);

DPRINTF(RDB_FOLLOW, ("rdintr(%s): bp %p, %c, flags %x\n",
device_xname(sc->sc_dev), bp, (bp->b_flags & B_READ) ? 'R' : 'W',
sc->sc_flags));

disk_unbusy(&sc->sc_dk, (bp->b_bcount - bp->b_resid),
(bp->b_flags & B_READ));

if (sc->sc_flags & RDF_SEEK) {
sc->sc_flags &= ~RDF_SEEK;
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);
disk_busy(&sc->sc_dk);
return;
}
if ((sc->sc_flags & RDF_SWAIT) == 0) {
if (gpibpptest(sc->sc_ic, slave) == 0) {
/* Instrumentation. */
disk_busy(&sc->sc_dk);
sc->sc_flags |= RDF_SWAIT;
gpibawait(sc->sc_ic);
return;
}
} else
sc->sc_flags &= ~RDF_SWAIT;
rv = gpibrecv(sc->sc_ic, slave, CS80CMD_QSTAT, &stat, 1);
if (rv != 1 || stat) {
DPRINTF(RDB_ERROR,
("rdintr: receive failed (rv=%d) or bad stat %d\n", rv,
stat));
restart = rderror(sc);
if (sc->sc_errcnt++ < RDRETRY) {
if (restart)
rdstart(sc);
return;
}
bp->b_error = EIO;
}
if (rdfinish(sc, bp) != NULL)
rdustart(sc);
rnd_add_uint32(&sc->rnd_source, bp->b_blkno);
}

/*
* Deal with errors.
* Returns 1 if request should be restarted,
* 0 if we should just quietly give up.
*/
int
rderror(struct rd_softc *sc)
{
struct cs80_stat css;
struct buf *bp;
daddr_t hwbn, pbn;

DPRINTF(RDB_FOLLOW, ("rderror: sc=%p\n", sc));

if (cs80status(device_parent(sc->sc_dev), sc->sc_slave,
sc->sc_punit, &css)) {
cs80reset(device_parent(sc->sc_dev), sc->sc_slave,
sc->sc_punit);
return (1);
}
#ifdef DEBUG
if (rddebug & RDB_ERROR) { /* status info */
printf("\n volume: %d, unit: %d\n",
(css.c_vu>>4)&0xF, css.c_vu&0xF);
printf(" reject 0x%x\n", css.c_ref);
printf(" fault 0x%x\n", css.c_fef);
printf(" access 0x%x\n", css.c_aef);
printf(" info 0x%x\n", css.c_ief);
printf(" block, P1-P10: ");
printf("0x%x", *(u_int32_t *)&css.c_raw[0]);
printf("0x%x", *(u_int32_t *)&css.c_raw[4]);
printf("0x%x\n", *(u_int16_t *)&css.c_raw[8]);
}
#endif
if (css.c_fef & FEF_REXMT)
return (1);
if (css.c_fef & FEF_PF) {
cs80reset(device_parent(sc->sc_dev), sc->sc_slave,
sc->sc_punit);
return (1);
}
/*
* Unit requests release for internal maintenance.
* We just delay awhile and try again later. Use exponentially
* increasing backoff ala ethernet drivers since we don't really
* know how long the maintenance will take. With RDWAITC and
* RDRETRY as defined, the range is 1 to 32 seconds.
*/
if (css.c_fef & FEF_IMR) {
extern int hz;
int rdtimo = RDWAITC << sc->sc_errcnt;
DPRINTF(RDB_STATUS,
("%s: internal maintenance, %d-second timeout\n",
device_xname(sc->sc_dev), rdtimo));
gpibrelease(sc->sc_ic, sc->sc_hdl);
callout_reset(&sc->sc_restart_ch, rdtimo * hz, rdrestart, sc);
return (0);
}
/*
* Only report error if we have reached the error reporting
* threshold. By default, this will only report after the
* retry limit has been exceeded.
*/
if (sc->sc_errcnt < rderrthresh)
return (1);

/*
* First conjure up the block number at which the error occurred.
*/
bp = bufq_peek(sc->sc_tab);
pbn = sc->sc_dk.dk_label->d_partitions[RDPART(bp->b_dev)].p_offset;
if ((css.c_fef & FEF_CU) || (css.c_fef & FEF_DR) ||
(css.c_ief & IEF_RRMASK)) {
/*
* Not all errors report a block number, just use b_blkno.
*/
hwbn = RDBTOS(pbn + bp->b_blkno);
pbn = bp->b_blkno;
} else {
hwbn = css.c_blk;
pbn = RDSTOB(hwbn) - pbn;
}
#ifdef DEBUG
if (rddebug & RDB_ERROR) { /* status info */
printf("\n volume: %d, unit: %d\n",
(css.c_vu>>4)&0xF, css.c_vu&0xF);
printf(" reject 0x%x\n", css.c_ref);
printf(" fault 0x%x\n", css.c_fef);
printf(" access 0x%x\n", css.c_aef);
printf(" info 0x%x\n", css.c_ief);
printf(" block, P1-P10: ");
printf(" block: %" PRId64 ", P1-P10: ", hwbn);
printf("0x%x", *(u_int32_t *)&css.c_raw[0]);
printf("0x%x", *(u_int32_t *)&css.c_raw[4]);
printf("0x%x\n", *(u_int16_t *)&css.c_raw[8]);
}
#endif
#ifdef DEBUG
if (rddebug & RDB_ERROR) { /* command */
printf(" ioc: ");
printf("0x%x", *(u_int32_t *)&sc->sc_ioc.c_pad);
printf("0x%x", *(u_int16_t *)&sc->sc_ioc.c_hiaddr);
printf("0x%x", *(u_int32_t *)&sc->sc_ioc.c_addr);
printf("0x%x", *(u_int16_t *)&sc->sc_ioc.c_nop2);
printf("0x%x", *(u_int32_t *)&sc->sc_ioc.c_len);
printf("0x%x\n", *(u_int16_t *)&sc->sc_ioc.c_cmd);
return (1);
}
#endif
/*
* Now output a generic message suitable for badsect.
* Note that we don't use harderr because it just prints
* out b_blkno which is just the beginning block number
* of the transfer, not necessary where the error occurred.
*/
printf("%s%c: hard error, sector number %" PRId64 "\n",
device_xname(sc->sc_dev), 'a'+RDPART(bp->b_dev), pbn);
/*
* Now report the status as returned by the hardware with
* attempt at interpretation.
*/
printf("%s %s error:", device_xname(sc->sc_dev),
(bp->b_flags & B_READ) ? "read" : "write");
printf(" unit %d, volume %d R0x%x F0x%x A0x%x I0x%x\n",
css.c_vu&0xF, (css.c_vu>>4)&0xF,
css.c_ref, css.c_fef, css.c_aef, css.c_ief);
printf("P1-P10: ");
printf("0x%x ", *(u_int32_t *)&css.c_raw[0]);
printf("0x%x ", *(u_int32_t *)&css.c_raw[4]);
printf("0x%x\n", *(u_int16_t *)&css.c_raw[8]);

return (1);
}

int
rdread(dev_t dev, struct uio *uio, int flags)
{

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

int
rdwrite(dev_t dev, struct uio *uio, int flags)
{

return (physio(rdstrategy, NULL, dev, B_WRITE, minphys, uio));
}

int
rdioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
{
struct rd_softc *sc;
struct disklabel *lp;
int error, flags;

sc = device_lookup_private(&rd_cd, RDUNIT(dev));
if (sc == NULL)
return (ENXIO);
lp = sc->sc_dk.dk_label;

DPRINTF(RDB_FOLLOW, ("rdioctl: sc=%p\n", sc));

error = disk_ioctl(&sc->sc_dk, dev, cmd, data, flag, l);
if (error != EPASSTHROUGH)
return error;

switch (cmd) {
case DIOCWLABEL:
if ((flag & FWRITE) == 0)
return (EBADF);
if (*(int *)data)
sc->sc_flags |= RDF_WLABEL;
else
sc->sc_flags &= ~RDF_WLABEL;
return (0);

case DIOCSDINFO:
if ((flag & FWRITE) == 0)
return (EBADF);
return (setdisklabel(lp, (struct disklabel *)data,
(sc->sc_flags & RDF_WLABEL) ? 0 : sc->sc_dk.dk_openmask,
(struct cpu_disklabel *)0));

case DIOCWDINFO:
if ((flag & FWRITE) == 0)
return (EBADF);
error = setdisklabel(lp, (struct disklabel *)data,
(sc->sc_flags & RDF_WLABEL) ? 0 : sc->sc_dk.dk_openmask,
(struct cpu_disklabel *)0);
if (error)
return (error);
flags = sc->sc_flags;
sc->sc_flags = RDF_ALIVE | RDF_WLABEL;
error = writedisklabel(RDLABELDEV(dev), rdstrategy, lp,
(struct cpu_disklabel *)0);
sc->sc_flags = flags;
return (error);

case DIOCGDEFLABEL:
rdgetdefaultlabel(sc, (struct disklabel *)data);
return (0);
}
return (EINVAL);
}

void
rdgetdefaultlabel(struct rd_softc *sc, struct disklabel *lp)
{
int type = sc->sc_type;

memset((void *)lp, 0, sizeof(struct disklabel));

lp->d_type = DKTYPE_HPIB /* DKTYPE_GPIB */;
lp->d_secsize = DEV_BSIZE;
lp->d_nsectors = rdidentinfo[type].ri_nbpt;
lp->d_ntracks = rdidentinfo[type].ri_ntpc;
lp->d_ncylinders = rdidentinfo[type].ri_ncyl;
lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors;
lp->d_secperunit = lp->d_ncylinders * lp->d_secpercyl;

strncpy(lp->d_typename, rdidentinfo[type].ri_desc, 16);
strncpy(lp->d_packname, "fictitious", 16);
lp->d_rpm = 3000;
lp->d_interleave = 1;
lp->d_flags = 0;

lp->d_partitions[RAW_PART].p_offset = 0;
lp->d_partitions[RAW_PART].p_size =
lp->d_secperunit * (lp->d_secsize / DEV_BSIZE);
lp->d_partitions[RAW_PART].p_fstype = FS_UNUSED;
lp->d_npartitions = RAW_PART + 1;

lp->d_magic = DISKMAGIC;
lp->d_magic2 = DISKMAGIC;
lp->d_checksum = dkcksum(lp);
}

int
rdsize(dev_t dev)
{
struct rd_softc *sc;
int psize, didopen = 0;

sc = device_lookup_private(&rd_cd, RDUNIT(dev));
if (sc == NULL || (sc->sc_flags & RDF_ALIVE) == 0)
return (-1);

/*
* We get called very early on (via swapconf)
* without the device being open so we may need
* to handle it here.
*/
if (sc->sc_dk.dk_openmask == 0) {
if (rdopen(dev, FREAD | FWRITE, S_IFBLK, NULL))
return (-1);
didopen = 1;
}
psize = sc->sc_dk.dk_label->d_partitions[RDPART(dev)].p_size *
(sc->sc_dk.dk_label->d_secsize / DEV_BSIZE);
if (didopen)
(void) rdclose(dev, FREAD | FWRITE, S_IFBLK, NULL);
return (psize);
}

static int rddoingadump; /* simple mutex */

/*
* Non-interrupt driven, non-dma dump routine.
*/
int
rddump(dev_t dev, daddr_t blkno, void *va, size_t size)
{
struct rd_softc *sc;
int sectorsize; /* size of a disk sector */
int nsects; /* number of sectors in partition */
int sectoff; /* sector offset of partition */
int totwrt; /* total number of sectors left to write */
int nwrt; /* current number of sectors to write */
int slave;
struct disklabel *lp;
u_int8_t stat;

/* Check for recursive dump; if so, punt. */
if (rddoingadump)
return (EFAULT);
rddoingadump = 1;

sc = device_lookup_private(&rd_cd, RDUNIT(dev));
if (sc == NULL || (sc->sc_flags & RDF_ALIVE) == 0)
return (ENXIO);

DPRINTF(RDB_FOLLOW, ("rddump: sc=%p\n", sc));

slave = sc->sc_slave;

/*
* Convert to disk sectors. Request must be a multiple of size.
*/
lp = sc->sc_dk.dk_label;
sectorsize = lp->d_secsize;
if ((size % sectorsize) != 0)
return (EFAULT);
totwrt = size / sectorsize;
blkno = dbtob(blkno) / sectorsize; /* blkno in DEV_BSIZE units */

nsects = lp->d_partitions[RDPART(dev)].p_size;
sectoff = lp->d_partitions[RDPART(dev)].p_offset;

/* Check transfer bounds against partition size. */
if ((blkno < 0) || (blkno + totwrt) > nsects)
return (EINVAL);

/* Offset block number to start of partition. */
blkno += sectoff;

while (totwrt > 0) {
nwrt = totwrt; /* XXX */
#ifndef RD_DUMP_NOT_TRUSTED
/*
* Fill out and send GPIB command.
*/
sc->sc_ioc.c_unit = CS80CMD_SUNIT(sc->sc_punit);
sc->sc_ioc.c_volume = CS80CMD_SVOL(0);
sc->sc_ioc.c_saddr = CS80CMD_SADDR;
sc->sc_ioc.c_hiaddr = 0;
sc->sc_ioc.c_addr = RDBTOS(blkno);
sc->sc_ioc.c_nop2 = CS80CMD_NOP;
sc->sc_ioc.c_slen = CS80CMD_SLEN;
sc->sc_ioc.c_len = nwrt * sectorsize;
sc->sc_ioc.c_cmd = CS80CMD_WRITE;
(void) gpibsend(sc->sc_ic, slave, CS80CMD_SCMD,
&sc->sc_ioc.c_unit, sizeof(sc->sc_ioc)-3);
if (gpibswait(sc->sc_ic, slave))
return (EIO);
/*
* Send the data.
*/
(void) gpibsend(sc->sc_ic, slave, CS80CMD_EXEC, va,
nwrt * sectorsize);
(void) gpibswait(sc->sc_ic, slave);
(void) gpibrecv(sc->sc_ic, slave, CS80CMD_QSTAT, &stat, 1);
if (stat)
return (EIO);
#else /* RD_DUMP_NOT_TRUSTED */
/* Let's just talk about this first... */
printf("%s: dump addr %p, blk %d\n", device_xname(sc->sc_dev),
va, blkno);
delay(500 * 1000); /* half a second */
#endif /* RD_DUMP_NOT_TRUSTED */

/* update block count */
totwrt -= nwrt;
blkno += nwrt;
va = (char *)va + sectorsize * nwrt;
}
rddoingadump = 0;
return (0);
}