NetBSD-5.0.2/sys/arch/hp300/dev/fhpib.c
/* $NetBSD: fhpib.c,v 1.39 2008/04/28 20:23:19 martin 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.
*
* @(#)fhpib.c 8.2 (Berkeley) 1/12/94
*/
/*
* 98625A/B HPIB driver
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: fhpib.c,v 1.39 2008/04/28 20:23:19 martin Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/callout.h>
#include <sys/kernel.h>
#include <sys/buf.h>
#include <sys/device.h>
#include <machine/autoconf.h>
#include <machine/intr.h>
#include <hp300/dev/diovar.h>
#include <hp300/dev/diodevs.h>
#include <hp300/dev/dmavar.h>
#include <hp300/dev/fhpibreg.h>
#include <hp300/dev/hpibvar.h>
/*
* Inline version of fhpibwait to be used in places where
* we don't worry about getting hung.
*/
#define FHPIBWAIT(hd, m) while (((hd)->hpib_intr & (m)) == 0) DELAY(1)
#ifdef DEBUG
int fhpibdebugunit = -1;
int fhpibdebug = 0;
#define FDB_FAIL 0x01
#define FDB_DMA 0x02
#define FDB_WAIT 0x04
#define FDB_PPOLL 0x08
int dopriodma = 0; /* use high priority DMA */
int doworddma = 1; /* non-zero if we should attempt word DMA */
int doppollint = 1; /* use ppoll interrupts instead of watchdog */
int fhpibppolldelay = 50;
#endif
static void fhpibifc(struct fhpibdevice *);
static void fhpibdmadone(void *);
static int fhpibwait(struct fhpibdevice *, int);
static void fhpibreset(struct hpibbus_softc *);
static int fhpibsend(struct hpibbus_softc *, int, int, void *, int);
static int fhpibrecv(struct hpibbus_softc *, int, int, void *, int);
static int fhpibppoll(struct hpibbus_softc *);
static void fhpibppwatch(void *);
static void fhpibgo(struct hpibbus_softc *, int, int, void *, int, int,
int);
static void fhpibdone(struct hpibbus_softc *);
static int fhpibintr(void *);
/*
* Our controller ops structure.
*/
static struct hpib_controller fhpib_controller = {
fhpibreset,
fhpibsend,
fhpibrecv,
fhpibppoll,
fhpibppwatch,
fhpibgo,
fhpibdone,
fhpibintr
};
struct fhpib_softc {
device_t sc_dev; /* generic device glue */
struct fhpibdevice *sc_regs; /* device registers */
int sc_cmd;
struct hpibbus_softc *sc_hpibbus; /* XXX */
struct callout sc_dmadone_ch;
struct callout sc_ppwatch_ch;
};
static int fhpibmatch(device_t, cfdata_t, void *);
static void fhpibattach(device_t, device_t, void *);
CFATTACH_DECL_NEW(fhpib, sizeof(struct fhpib_softc),
fhpibmatch, fhpibattach, NULL, NULL);
static int
fhpibmatch(device_t parent, cfdata_t cf, void *aux)
{
struct dio_attach_args *da = aux;
if (da->da_id == DIO_DEVICE_ID_FHPIB)
return 1;
return 0;
}
static void
fhpibattach(device_t parent, device_t self, void *aux)
{
struct fhpib_softc *sc = device_private(self);
struct dio_attach_args *da = aux;
struct hpibdev_attach_args ha;
bus_space_handle_t bsh;
sc->sc_dev = self;
if (bus_space_map(da->da_bst, da->da_addr, da->da_size, 0, &bsh)) {
aprint_error(": can't map registers\n");
return;
}
sc->sc_regs = bus_space_vaddr(da->da_bst, bsh);
aprint_normal(": %s\n", DIO_DEVICE_DESC_FHPIB);
/* Establish the interrupt handler. */
(void)dio_intr_establish(fhpibintr, sc, da->da_ipl, IPL_BIO);
callout_init(&sc->sc_dmadone_ch, 0);
callout_init(&sc->sc_ppwatch_ch, 0);
ha.ha_ops = &fhpib_controller;
ha.ha_type = HPIBC; /* XXX */
ha.ha_ba = HPIBC_BA;
ha.ha_softcpp = &sc->sc_hpibbus; /* XXX */
(void)config_found(self, &ha, hpibdevprint);
}
static void
fhpibreset(struct hpibbus_softc *hs)
{
struct fhpib_softc *sc = device_private(device_parent(hs->sc_dev));
struct fhpibdevice *hd = sc->sc_regs;
hd->hpib_cid = 0xFF;
DELAY(100);
hd->hpib_cmd = CT_8BIT;
hd->hpib_ar = AR_ARONC;
fhpibifc(hd);
hd->hpib_ie = IDS_IE;
hd->hpib_data = C_DCL;
DELAY(100000);
/*
* See if we can do word DMA.
* If so, we should be able to write and read back the appropos bit.
*/
hd->hpib_ie |= IDS_WDMA;
if (hd->hpib_ie & IDS_WDMA) {
hd->hpib_ie &= ~IDS_WDMA;
hs->sc_flags |= HPIBF_DMA16;
#ifdef DEBUG
if (fhpibdebug & FDB_DMA)
printf("fhpibtype: %s has word DMA\n",
device_xname(sc->sc_dev));
#endif
}
}
static void
fhpibifc(struct fhpibdevice *hd)
{
hd->hpib_cmd |= CT_IFC;
hd->hpib_cmd |= CT_INITFIFO;
DELAY(100);
hd->hpib_cmd &= ~CT_IFC;
hd->hpib_cmd |= CT_REN;
hd->hpib_stat = ST_ATN;
}
static int
fhpibsend(struct hpibbus_softc *hs, int slave, int sec, void *ptr, int origcnt)
{
struct fhpib_softc *sc = device_private(device_parent(hs->sc_dev));
struct fhpibdevice *hd = sc->sc_regs;
int cnt = origcnt;
int timo;
char *addr = ptr;
hd->hpib_stat = 0;
hd->hpib_imask = IM_IDLE | IM_ROOM;
if (fhpibwait(hd, IM_IDLE) < 0)
goto senderr;
hd->hpib_stat = ST_ATN;
hd->hpib_data = C_UNL;
hd->hpib_data = C_TAG + hs->sc_ba;
hd->hpib_data = C_LAG + slave;
if (sec < 0) {
if (sec == -2) /* selected device clear KLUDGE */
hd->hpib_data = C_SDC;
} else
hd->hpib_data = C_SCG + sec;
if (fhpibwait(hd, IM_IDLE) < 0)
goto senderr;
if (cnt) {
hd->hpib_stat = ST_WRITE;
while (--cnt) {
hd->hpib_data = *addr++;
timo = hpibtimeout;
while ((hd->hpib_intr & IM_ROOM) == 0) {
if (--timo <= 0)
goto senderr;
DELAY(1);
}
}
hd->hpib_stat = ST_EOI;
hd->hpib_data = *addr;
FHPIBWAIT(hd, IM_ROOM);
hd->hpib_stat = ST_ATN;
/* XXX: HP-UX claims bug with CS80 transparent messages */
if (sec == 0x12)
DELAY(150);
hd->hpib_data = C_UNL;
(void) fhpibwait(hd, IM_IDLE);
}
hd->hpib_imask = 0;
return origcnt;
senderr:
hd->hpib_imask = 0;
fhpibifc(hd);
#ifdef DEBUG
if (fhpibdebug & FDB_FAIL) {
printf("%s: fhpibsend failed: slave %d, sec %x, ",
device_xname(sc->sc_dev), slave, sec);
printf("sent %d of %d bytes\n", origcnt-cnt-1, origcnt);
}
#endif
return origcnt - cnt - 1;
}
static int
fhpibrecv(struct hpibbus_softc *hs, int slave, int sec, void *ptr, int origcnt)
{
struct fhpib_softc *sc = device_private(device_parent(hs->sc_dev));
struct fhpibdevice *hd = sc->sc_regs;
int cnt = origcnt;
int timo;
char *addr = ptr;
/*
* Slave < 0 implies continuation of a previous receive
* that probably timed out.
*/
if (slave >= 0) {
hd->hpib_stat = 0;
hd->hpib_imask = IM_IDLE | IM_ROOM | IM_BYTE;
if (fhpibwait(hd, IM_IDLE) < 0)
goto recverror;
hd->hpib_stat = ST_ATN;
hd->hpib_data = C_UNL;
hd->hpib_data = C_LAG + hs->sc_ba;
hd->hpib_data = C_TAG + slave;
if (sec != -1)
hd->hpib_data = C_SCG + sec;
if (fhpibwait(hd, IM_IDLE) < 0)
goto recverror;
hd->hpib_stat = ST_READ0;
hd->hpib_data = 0;
}
if (cnt) {
while (--cnt >= 0) {
timo = hpibtimeout;
while ((hd->hpib_intr & IM_BYTE) == 0) {
if (--timo == 0)
goto recvbyteserror;
DELAY(1);
}
*addr++ = hd->hpib_data;
}
FHPIBWAIT(hd, IM_ROOM);
hd->hpib_stat = ST_ATN;
hd->hpib_data = (slave == 31) ? C_UNA : C_UNT;
(void) fhpibwait(hd, IM_IDLE);
}
hd->hpib_imask = 0;
return origcnt;
recverror:
fhpibifc(hd);
recvbyteserror:
hd->hpib_imask = 0;
#ifdef DEBUG
if (fhpibdebug & FDB_FAIL) {
printf("%s: fhpibrecv failed: slave %d, sec %x, ",
device_xname(sc->sc_dev), slave, sec);
printf("got %d of %d bytes\n", origcnt-cnt-1, origcnt);
}
#endif
return origcnt - cnt - 1;
}
static void
fhpibgo(struct hpibbus_softc *hs, int slave, int sec, void *ptr, int count,
int rw, int timo)
{
struct fhpib_softc *sc = device_private(device_parent(hs->sc_dev));
struct fhpibdevice *hd = sc->sc_regs;
int i;
char *addr = ptr;
int flags = 0;
hs->sc_flags |= HPIBF_IO;
if (timo)
hs->sc_flags |= HPIBF_TIMO;
if (rw == B_READ)
hs->sc_flags |= HPIBF_READ;
#ifdef DEBUG
else if (hs->sc_flags & HPIBF_READ) {
printf("%s: HPIBF_READ still set\n", __func__);
hs->sc_flags &= ~HPIBF_READ;
}
#endif
hs->sc_count = count;
hs->sc_addr = addr;
#ifdef DEBUG
/* fhpibtransfer[unit]++; XXX */
#endif
if ((hs->sc_flags & HPIBF_DMA16) &&
((int)addr & 1) == 0 && count && (count & 1) == 0
#ifdef DEBUG
&& doworddma
#endif
) {
#ifdef DEBUG
/* fhpibworddma[unit]++; XXX */
#endif
flags |= DMAGO_WORD;
hd->hpib_latch = 0;
}
#ifdef DEBUG
if (dopriodma)
flags |= DMAGO_PRI;
#endif
if (hs->sc_flags & HPIBF_READ) {
sc->sc_cmd = CT_REN | CT_8BIT;
hs->sc_curcnt = count;
dmago(hs->sc_dq->dq_chan, addr, count, flags|DMAGO_READ);
if (fhpibrecv(hs, slave, sec, 0, 0) < 0) {
#ifdef DEBUG
printf("%s: recv failed, retrying...\n", __func__);
#endif
(void)fhpibrecv(hs, slave, sec, 0, 0);
}
i = hd->hpib_cmd;
hd->hpib_cmd = sc->sc_cmd;
hd->hpib_ie = IDS_DMA(hs->sc_dq->dq_chan) |
((flags & DMAGO_WORD) ? IDS_WDMA : 0);
return;
}
sc->sc_cmd = CT_REN | CT_8BIT | CT_FIFOSEL;
if (count < hpibdmathresh) {
#ifdef DEBUG
/* fhpibnondma[unit]++; XXX */
if (flags & DMAGO_WORD)
/* fhpibworddma[unit]--; XXX */ ;
#endif
hs->sc_curcnt = count;
(void) fhpibsend(hs, slave, sec, addr, count);
fhpibdone(hs);
return;
}
count -= (flags & DMAGO_WORD) ? 2 : 1;
hs->sc_curcnt = count;
dmago(hs->sc_dq->dq_chan, addr, count, flags);
if (fhpibsend(hs, slave, sec, 0, 0) < 0) {
#ifdef DEBUG
printf("%s: send failed, retrying...\n", __func__);
#endif
(void)fhpibsend(hs, slave, sec, 0, 0);
}
i = hd->hpib_cmd;
hd->hpib_cmd = sc->sc_cmd;
hd->hpib_ie = IDS_DMA(hs->sc_dq->dq_chan) | IDS_WRITE |
((flags & DMAGO_WORD) ? IDS_WDMA : 0);
}
/*
* A DMA read can finish but the device can still be waiting (MAG-tape
* with more data than we're waiting for). This timeout routine
* takes care of that. Somehow, the thing gets hosed. For now, since
* this should be a very rare occurence, we RESET it.
*/
static void
fhpibdmadone(void *arg)
{
struct hpibbus_softc *hs = arg;
struct fhpib_softc *sc = device_private(device_parent(hs->sc_dev));
int s = splbio();
if (hs->sc_flags & HPIBF_IO) {
struct fhpibdevice *hd = sc->sc_regs;
struct hpibqueue *hq;
hd->hpib_imask = 0;
hd->hpib_cid = 0xFF;
DELAY(100);
hd->hpib_cmd = CT_8BIT;
hd->hpib_ar = AR_ARONC;
fhpibifc(hd);
hd->hpib_ie = IDS_IE;
hs->sc_flags &= ~(HPIBF_DONE|HPIBF_IO|HPIBF_READ|HPIBF_TIMO);
dmafree(hs->sc_dq);
hq = TAILQ_FIRST(&hs->sc_queue);
(hq->hq_intr)(hq->hq_softc);
}
splx(s);
}
static void
fhpibdone(struct hpibbus_softc *hs)
{
struct fhpib_softc *sc = device_private(device_parent(hs->sc_dev));
struct fhpibdevice *hd = sc->sc_regs;
char *addr;
int cnt;
cnt = hs->sc_curcnt;
hs->sc_addr += cnt;
hs->sc_count -= cnt;
#ifdef DEBUG
if ((fhpibdebug & FDB_DMA) &&
fhpibdebugunit == device_unit(sc->sc_dev))
printf("%s: addr %p cnt %d\n",
__func__, hs->sc_addr, hs->sc_count);
#endif
if (hs->sc_flags & HPIBF_READ) {
hd->hpib_imask = IM_IDLE | IM_BYTE;
if (hs->sc_flags & HPIBF_TIMO)
callout_reset(&sc->sc_dmadone_ch, hz >> 2,
fhpibdmadone, hs);
} else {
cnt = hs->sc_count;
if (cnt) {
addr = hs->sc_addr;
hd->hpib_imask = IM_IDLE | IM_ROOM;
FHPIBWAIT(hd, IM_IDLE);
hd->hpib_stat = ST_WRITE;
while (--cnt) {
hd->hpib_data = *addr++;
FHPIBWAIT(hd, IM_ROOM);
}
hd->hpib_stat = ST_EOI;
hd->hpib_data = *addr;
}
hd->hpib_imask = IM_IDLE;
}
hs->sc_flags |= HPIBF_DONE;
hd->hpib_stat = ST_IENAB;
hd->hpib_ie = IDS_IE;
}
static int
fhpibintr(void *arg)
{
struct fhpib_softc *sc = arg;
struct hpibbus_softc *hs = sc->sc_hpibbus;
struct fhpibdevice *hd = sc->sc_regs;
struct hpibqueue *hq;
int stat0;
stat0 = hd->hpib_ids;
if ((stat0 & (IDS_IE|IDS_IR)) != (IDS_IE|IDS_IR)) {
#ifdef DEBUG
if ((fhpibdebug & FDB_FAIL) && (stat0 & IDS_IR) &&
(hs->sc_flags & (HPIBF_IO|HPIBF_DONE)) != HPIBF_IO)
printf("%s: fhpibintr: bad status %x\n",
device_xname(sc->sc_dev), stat0);
/* fhpibbadint[0]++; XXX */
#endif
return 0;
}
if ((hs->sc_flags & (HPIBF_IO|HPIBF_DONE)) == HPIBF_IO) {
#ifdef DEBUG
/* fhpibbadint[1]++; XXX */
#endif
return 0;
}
#ifdef DEBUG
if ((fhpibdebug & FDB_DMA) &&
fhpibdebugunit == device_unit(sc->sc_dev))
printf("%s: flags %x\n", __func__, hs->sc_flags);
#endif
hq = TAILQ_FIRST(&hs->sc_queue);
if (hs->sc_flags & HPIBF_IO) {
if (hs->sc_flags & HPIBF_TIMO)
callout_stop(&sc->sc_dmadone_ch);
stat0 = hd->hpib_cmd;
hd->hpib_cmd = sc->sc_cmd & ~CT_8BIT;
hd->hpib_stat = 0;
hd->hpib_cmd = CT_REN | CT_8BIT;
stat0 = hd->hpib_intr;
hd->hpib_imask = 0;
hs->sc_flags &= ~(HPIBF_DONE|HPIBF_IO|HPIBF_READ|HPIBF_TIMO);
dmafree(hs->sc_dq);
(hq->hq_intr)(hq->hq_softc);
} else if (hs->sc_flags & HPIBF_PPOLL) {
stat0 = hd->hpib_intr;
#ifdef DEBUG
if ((fhpibdebug & FDB_FAIL) &&
doppollint && (stat0 & IM_PPRESP) == 0)
printf("%s: fhpibintr: bad intr reg %x\n",
device_xname(sc->sc_dev), stat0);
#endif
hd->hpib_stat = 0;
hd->hpib_imask = 0;
#ifdef DEBUG
stat0 = fhpibppoll(hs);
if ((fhpibdebug & FDB_PPOLL) &&
fhpibdebugunit == device_unit(sc->sc_dev))
printf("%s: got PPOLL status %x\n", __func__, stat0);
if ((stat0 & (0x80 >> hq->hq_slave)) == 0) {
/*
* XXX give it another shot (68040)
*/
/* fhpibppollfail[unit]++; XXX */
DELAY(fhpibppolldelay);
stat0 = fhpibppoll(hs);
if ((stat0 & (0x80 >> hq->hq_slave)) == 0 &&
(fhpibdebug & FDB_PPOLL) &&
fhpibdebugunit == device_unit(sc->sc_dev))
printf("%s: PPOLL: unit %d slave %d stat %x\n",
__func__, device_unit(sc->sc_dev),
hq->hq_slave, stat0);
}
#endif
hs->sc_flags &= ~HPIBF_PPOLL;
(hq->hq_intr)(hq->hq_softc);
}
return 1;
}
static int
fhpibppoll(struct hpibbus_softc *hs)
{
struct fhpib_softc *sc = device_private(device_parent(hs->sc_dev));
struct fhpibdevice *hd = sc->sc_regs;
int ppoll;
hd->hpib_stat = 0;
hd->hpib_psense = 0;
hd->hpib_pmask = 0xFF;
hd->hpib_imask = IM_PPRESP | IM_PABORT;
DELAY(25);
hd->hpib_intr = IM_PABORT;
ppoll = hd->hpib_data;
if (hd->hpib_intr & IM_PABORT)
ppoll = 0;
hd->hpib_imask = 0;
hd->hpib_pmask = 0;
hd->hpib_stat = ST_IENAB;
return ppoll;
}
static int
fhpibwait(struct fhpibdevice *hd, int x)
{
int timo = hpibtimeout;
while ((hd->hpib_intr & x) == 0 && --timo)
DELAY(1);
if (timo == 0) {
#ifdef DEBUG
if (fhpibdebug & FDB_FAIL)
printf("%s(%p, %x) timeout\n", __func__, hd, x);
#endif
return -1;
}
return 0;
}
/*
* XXX: this will have to change if we ever allow more than one
* pending operation per HP-IB.
*/
static void
fhpibppwatch(void *arg)
{
struct hpibbus_softc *hs = arg;
struct fhpib_softc *sc = device_private(device_parent(hs->sc_dev));
struct fhpibdevice *hd = sc->sc_regs;
int slave;
if ((hs->sc_flags & HPIBF_PPOLL) == 0)
return;
slave = (0x80 >> TAILQ_FIRST(&hs->sc_queue)->hq_slave);
#ifdef DEBUG
if (!doppollint) {
if (fhpibppoll(hs) & slave) {
hd->hpib_stat = ST_IENAB;
hd->hpib_imask = IM_IDLE | IM_ROOM;
} else
callout_reset(&sc->sc_ppwatch_ch, 1, fhpibppwatch, sc);
return;
}
if ((fhpibdebug & FDB_PPOLL) &&
device_unit(sc->sc_dev) == fhpibdebugunit)
printf("%s: sense request on %s\n",
__func__, device_xname(sc->sc_dev));
#endif
hd->hpib_psense = ~slave;
hd->hpib_pmask = slave;
hd->hpib_stat = ST_IENAB;
hd->hpib_imask = IM_PPRESP | IM_PABORT;
hd->hpib_ie = IDS_IE;
}