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BSD 4_4 release
[unix-history] / usr / src / sys / hp300 / dev / fhpib.c
/*
* 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. 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.
*
* @(#)fhpib.c 8.1 (Berkeley) 6/10/93
*/
/*
* 98625A/B HPIB driver
*/
#include "hpib.h"
#if NHPIB > 0
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <hp/dev/device.h>
#include <hp300/dev/fhpibreg.h>
#include <hp300/dev/hpibvar.h>
#include <hp300/dev/dmavar.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;
long fhpibbadint[2] = { 0 };
long fhpibtransfer[NHPIB] = { 0 };
long fhpibnondma[NHPIB] = { 0 };
long fhpibworddma[NHPIB] = { 0 };
long fhpibppollfail[NHPIB] = { 0 };
#endif
int fhpibcmd[NHPIB];
fhpibtype(hc)
register struct hp_ctlr *hc;
{
register struct hpib_softc *hs = &hpib_softc[hc->hp_unit];
register struct fhpibdevice *hd = (struct fhpibdevice *)hc->hp_addr;
if (hd->hpib_cid != HPIBC)
return(0);
hs->sc_type = HPIBC;
hs->sc_ba = HPIBC_BA;
hc->hp_ipl = HPIB_IPL(hd->hpib_ids);
return(1);
}
fhpibreset(unit)
{
register struct hpib_softc *hs = &hpib_softc[unit];
register struct fhpibdevice *hd;
hd = (struct fhpibdevice *)hs->sc_hc->hp_addr;
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: unit %d has word dma\n", unit);
#endif
}
}
fhpibifc(hd)
register 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;
}
fhpibsend(unit, slave, sec, addr, origcnt)
register char *addr;
{
register struct hpib_softc *hs = &hpib_softc[unit];
register struct fhpibdevice *hd;
register int cnt = origcnt;
register int timo;
hd = (struct fhpibdevice *)hs->sc_hc->hp_addr;
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 != -1)
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("hpib%d: fhpibsend failed: slave %d, sec %x, ",
unit, slave, sec);
printf("sent %d of %d bytes\n", origcnt-cnt-1, origcnt);
}
#endif
return(origcnt - cnt - 1);
}
fhpibrecv(unit, slave, sec, addr, origcnt)
register char *addr;
{
register struct hpib_softc *hs = &hpib_softc[unit];
register struct fhpibdevice *hd;
register int cnt = origcnt;
register int timo;
hd = (struct fhpibdevice *)hs->sc_hc->hp_addr;
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("hpib%d: fhpibrecv failed: slave %d, sec %x, ",
unit, slave, sec);
printf("got %d of %d bytes\n", origcnt-cnt-1, origcnt);
}
#endif
return(origcnt - cnt - 1);
}
fhpibgo(unit, slave, sec, addr, count, rw)
register int unit;
char *addr;
{
register struct hpib_softc *hs = &hpib_softc[unit];
register struct fhpibdevice *hd;
register int i;
int flags = 0;
#ifdef lint
i = unit; if (i) return;
#endif
hd = (struct fhpibdevice *)hs->sc_hc->hp_addr;
hs->sc_flags |= HPIBF_IO;
if (rw == B_READ)
hs->sc_flags |= HPIBF_READ;
#ifdef DEBUG
else if (hs->sc_flags & HPIBF_READ) {
printf("fhpibgo: HPIBF_READ still set\n");
hs->sc_flags &= ~HPIBF_READ;
}
#endif
hs->sc_count = count;
hs->sc_addr = addr;
#ifdef DEBUG
fhpibtransfer[unit]++;
#endif
if ((hs->sc_flags & HPIBF_DMA16) &&
((int)addr & 1) == 0 && count && (count & 1) == 0
#ifdef DEBUG
&& doworddma
#endif
) {
#ifdef DEBUG
fhpibworddma[unit]++;
#endif
flags |= DMAGO_WORD;
hd->hpib_latch = 0;
}
#ifdef DEBUG
if (dopriodma)
flags |= DMAGO_PRI;
#endif
if (hs->sc_flags & HPIBF_READ) {
fhpibcmd[unit] = CT_REN | CT_8BIT;
hs->sc_curcnt = count;
dmago(hs->sc_dq.dq_ctlr, addr, count, flags|DMAGO_READ);
if (fhpibrecv(unit, slave, sec, 0, 0) < 0) {
#ifdef DEBUG
printf("fhpibgo: recv failed, retrying...\n");
#endif
(void) fhpibrecv(unit, slave, sec, 0, 0);
}
i = hd->hpib_cmd;
hd->hpib_cmd = fhpibcmd[unit];
hd->hpib_ie = IDS_DMA(hs->sc_dq.dq_ctlr) |
((flags & DMAGO_WORD) ? IDS_WDMA : 0);
return;
}
fhpibcmd[unit] = CT_REN | CT_8BIT | CT_FIFOSEL;
if (count < hpibdmathresh) {
#ifdef DEBUG
fhpibnondma[unit]++;
if (flags & DMAGO_WORD)
fhpibworddma[unit]--;
#endif
hs->sc_curcnt = count;
(void) fhpibsend(unit, slave, sec, addr, count);
fhpibdone(unit);
return;
}
count -= (flags & DMAGO_WORD) ? 2 : 1;
hs->sc_curcnt = count;
dmago(hs->sc_dq.dq_ctlr, addr, count, flags);
if (fhpibsend(unit, slave, sec, 0, 0) < 0) {
#ifdef DEBUG
printf("fhpibgo: send failed, retrying...\n");
#endif
(void) fhpibsend(unit, slave, sec, 0, 0);
}
i = hd->hpib_cmd;
hd->hpib_cmd = fhpibcmd[unit];
hd->hpib_ie = IDS_DMA(hs->sc_dq.dq_ctlr) | IDS_WRITE |
((flags & DMAGO_WORD) ? IDS_WDMA : 0);
}
fhpibdone(unit)
{
register struct hpib_softc *hs = &hpib_softc[unit];
register struct fhpibdevice *hd;
register char *addr;
register int cnt;
hd = (struct fhpibdevice *)hs->sc_hc->hp_addr;
cnt = hs->sc_curcnt;
hs->sc_addr += cnt;
hs->sc_count -= cnt;
#ifdef DEBUG
if ((fhpibdebug & FDB_DMA) && fhpibdebugunit == unit)
printf("fhpibdone: addr %x cnt %d\n",
hs->sc_addr, hs->sc_count);
#endif
if (hs->sc_flags & HPIBF_READ)
hd->hpib_imask = IM_IDLE | IM_BYTE;
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;
}
fhpibintr(unit)
register int unit;
{
register struct hpib_softc *hs = &hpib_softc[unit];
register struct fhpibdevice *hd;
register struct devqueue *dq;
register int stat0;
hd = (struct fhpibdevice *)hs->sc_hc->hp_addr;
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("hpib%d: fhpibintr: bad status %x\n",
unit, stat0);
fhpibbadint[0]++;
#endif
return(0);
}
if ((hs->sc_flags & (HPIBF_IO|HPIBF_DONE)) == HPIBF_IO) {
#ifdef DEBUG
fhpibbadint[1]++;
#endif
return(0);
}
#ifdef DEBUG
if ((fhpibdebug & FDB_DMA) && fhpibdebugunit == unit)
printf("fhpibintr: flags %x\n", hs->sc_flags);
#endif
dq = hs->sc_sq.dq_forw;
if (hs->sc_flags & HPIBF_IO) {
stat0 = hd->hpib_cmd;
hd->hpib_cmd = fhpibcmd[unit] & ~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);
dmafree(&hs->sc_dq);
(dq->dq_driver->d_intr)(dq->dq_unit);
} else if (hs->sc_flags & HPIBF_PPOLL) {
stat0 = hd->hpib_intr;
#ifdef DEBUG
if ((fhpibdebug & FDB_FAIL) &&
doppollint && (stat0 & IM_PPRESP) == 0)
printf("hpib%d: fhpibintr: bad intr reg %x\n",
unit, stat0);
#endif
hd->hpib_stat = 0;
hd->hpib_imask = 0;
#ifdef DEBUG
stat0 = fhpibppoll(unit);
if ((fhpibdebug & FDB_PPOLL) && unit == fhpibdebugunit)
printf("fhpibintr: got PPOLL status %x\n", stat0);
if ((stat0 & (0x80 >> dq->dq_slave)) == 0) {
/*
* XXX give it another shot (68040)
*/
fhpibppollfail[unit]++;
DELAY(fhpibppolldelay);
stat0 = fhpibppoll(unit);
if ((stat0 & (0x80 >> dq->dq_slave)) == 0 &&
(fhpibdebug & FDB_PPOLL) && unit == fhpibdebugunit)
printf("fhpibintr: PPOLL: unit %d slave %d stat %x\n",
unit, dq->dq_slave, stat0);
}
#endif
hs->sc_flags &= ~HPIBF_PPOLL;
(dq->dq_driver->d_intr)(dq->dq_unit);
}
return(1);
}
fhpibppoll(unit)
{
register struct fhpibdevice *hd;
register int ppoll;
hd = (struct fhpibdevice *)hpib_softc[unit].sc_hc->hp_addr;
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);
}
fhpibwait(hd, x)
register struct fhpibdevice *hd;
{
register int timo = hpibtimeout;
while ((hd->hpib_intr & x) == 0 && --timo)
DELAY(1);
if (timo == 0) {
#ifdef DEBUG
if (fhpibdebug & FDB_FAIL)
printf("fhpibwait(%x, %x) timeout\n", 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.
*/
void
fhpibppwatch(arg)
void *arg;
{
register int unit;
register struct hpib_softc *hs;
register struct fhpibdevice *hd;
register int slave;
unit = (int)arg;
hs = &hpib_softc[unit];
if ((hs->sc_flags & HPIBF_PPOLL) == 0)
return;
hd = (struct fhpibdevice *)hs->sc_hc->hp_addr;
slave = (0x80 >> hs->sc_sq.dq_forw->dq_slave);
#ifdef DEBUG
if (!doppollint) {
if (fhpibppoll(unit) & slave) {
hd->hpib_stat = ST_IENAB;
hd->hpib_imask = IM_IDLE | IM_ROOM;
} else
timeout(fhpibppwatch, (void *)unit, 1);
return;
}
if ((fhpibdebug & FDB_PPOLL) && unit == fhpibdebugunit)
printf("fhpibppwatch: sense request on %d\n", unit);
#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;
}
#endif
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.