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NetBSD/sys/arch/hp300/dev/mt.c
thorpej d6f4511690 All interrupt routines (except the HIL; don't ask) now take a pointer 
to a softc, rather than a unit number.  Add a "dq_softc" member
to struct devqueue; this is a temporary measure until the
dma/controller/device callback spaghetti is untangled.

YAY!  No more need for dcafastservice!

HIL: squish instances of "(void) splhil()" and "(void) spl0();".
1996-02-14 02:43:54 +00:00

933 lines
22 KiB
C
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/* $NetBSD: mt.c,v 1.3 1996/02/14 02:44:40 thorpej Exp $ */
/*
* Copyright (c) 1992, The University of Utah and
* the Computer Systems Laboratory at the University of Utah (CSL).
* All rights reserved.
*
* Permission to use, copy, modify and distribute this software is hereby
* granted provided that (1) source code retains these copyright, permission,
* and disclaimer notices, and (2) redistributions including binaries
* reproduce the notices in supporting documentation, and (3) all advertising
* materials mentioning features or use of this software display the following
* acknowledgement: ``This product includes software developed by the
* Computer Systems Laboratory at the University of Utah.''
*
* THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
* IS" CONDITION. THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
* ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* CSL requests users of this software to return to csl-dist@cs.utah.edu any
* improvements that they make and grant CSL redistribution rights.
*
* Utah $Hdr: mt.c 1.8 95/09/12$
*/
/* @(#)mt.c 3.9 90/07/10 mt Xinu
*
* Magnetic tape driver (7974a, 7978a/b, 7979a, 7980a, 7980xc)
* Original version contributed by Mt. Xinu.
* Modified for 4.4BSD by Mark Davies and Andrew Vignaux, Department of
* Computer Science, Victoria University of Wellington
*/
#include "mt.h"
#if NMT > 0
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/ioctl.h>
#include <sys/mtio.h>
#include <sys/file.h>
#include <sys/proc.h>
#include <sys/errno.h>
#include <sys/syslog.h>
#include <sys/tty.h>
#include <sys/kernel.h>
#include <sys/tprintf.h>
#include <hp300/dev/device.h>
#include <hp300/dev/hpibvar.h>
#include <hp300/dev/mtreg.h>
struct mtinfo {
u_short hwid;
char *desc;
} mtinfo[] = {
MT7978ID, "7978",
MT7979AID, "7979A",
MT7980ID, "7980",
MT7974AID, "7974A",
};
int nmtinfo = sizeof(mtinfo) / sizeof(mtinfo[0]);
struct mt_softc {
struct hp_device *sc_hd;
short sc_hpibno; /* logical HPIB this slave it attached to */
short sc_slave; /* HPIB slave address (0-6) */
short sc_flags; /* see below */
u_char sc_lastdsj; /* place for DSJ in mtreaddsj() */
u_char sc_lastecmd; /* place for End Command in mtreaddsj() */
short sc_recvtimeo; /* count of hpibsend timeouts to prevent hang */
short sc_statindex; /* index for next sc_stat when MTF_STATTIMEO */
struct mt_stat sc_stat;/* status bytes last read from device */
short sc_density; /* current density of tape (mtio.h format) */
short sc_type; /* tape drive model (hardware IDs) */
struct devqueue sc_dq; /* HPIB device queue member */
tpr_t sc_ttyp;
} mt_softc[NMT];
struct buf mttab[NMT];
struct buf mtbuf[NMT];
#ifdef DEBUG
int mtdebug = 0;
#define dlog if (mtdebug) log
#else
#define dlog if (0) log
#endif
#define UNIT(x) (minor(x) & 3)
#define B_CMD B_XXX /* command buf instead of data */
#define b_cmd b_blkno /* blkno holds cmd when B_CMD */
int mtmatch(), mtintr();
void mtattach(), mtustart(), mtstart(), mtgo(), mtstrategy();
struct driver mtdriver = {
mtmatch, mtattach, "mt", (int (*)()) mtstart, (int (*)()) mtgo, mtintr,
};
int
mtmatch(hd)
register struct hp_device *hd;
{
register int unit;
register int hpibno = hd->hp_ctlr;
register int slave = hd->hp_slave;
register struct mt_softc *sc = &mt_softc[hd->hp_unit];
register int id;
register struct buf *bp;
sc->sc_hd = hd;
for (bp = mttab; bp < &mttab[NMT]; bp++)
bp->b_actb = &bp->b_actf;
unit = hpibid(hpibno, slave);
for (id = 0; id < nmtinfo; id++)
if (unit == mtinfo[id].hwid)
return (1);
return (0); /* not a known HP magtape */
}
void
mtattach(hd)
register struct hp_device *hd;
{
register int unit;
register int hpibno = hd->hp_ctlr;
register int slave = hd->hp_slave;
register struct mt_softc *sc;
register int id;
register struct buf *bp;
/* XXX Ick. */
unit = hpibid(hpibno, slave);
for (id = 0; id < nmtinfo; id++)
if (unit == mtinfo[id].hwid)
break;
unit = hd->hp_unit;
sc = &mt_softc[unit];
sc->sc_type = mtinfo[id].hwid;
printf(": %s tape\n", mtinfo[id].desc);
sc->sc_hpibno = hpibno;
sc->sc_slave = slave;
sc->sc_flags = MTF_EXISTS;
sc->sc_dq.dq_softc = sc;
sc->sc_dq.dq_ctlr = hpibno;
sc->sc_dq.dq_unit = unit;
sc->sc_dq.dq_slave = slave;
sc->sc_dq.dq_driver = &mtdriver;
}
/*
* Perform a read of "Device Status Jump" register and update the
* status if necessary. If status is read, the given "ecmd" is also
* performed, unless "ecmd" is zero. Returns DSJ value, -1 on failure
* and -2 on "temporary" failure.
*/
mtreaddsj(unit, ecmd)
register int unit;
int ecmd;
{
register struct mt_softc *sc = &mt_softc[unit];
int retval;
if (sc->sc_flags & MTF_STATTIMEO)
goto getstats;
retval = hpibrecv(sc->sc_hpibno,
(sc->sc_flags & MTF_DSJTIMEO) ? -1 : sc->sc_slave,
MTT_DSJ, &(sc->sc_lastdsj), 1);
sc->sc_flags &= ~MTF_DSJTIMEO;
if (retval != 1) {
dlog(LOG_DEBUG, "mt%d can't hpibrecv DSJ\n", unit);
if (sc->sc_recvtimeo == 0)
sc->sc_recvtimeo = hz;
if (--sc->sc_recvtimeo == 0)
return (-1);
if (retval == 0)
sc->sc_flags |= MTF_DSJTIMEO;
return (-2);
}
sc->sc_recvtimeo = 0;
sc->sc_statindex = 0;
dlog(LOG_DEBUG, "mt%d readdsj: 0x%x\n", unit, sc->sc_lastdsj);
sc->sc_lastecmd = ecmd;
switch (sc->sc_lastdsj) {
case 0:
if (ecmd & MTE_DSJ_FORCE)
break;
return (0);
case 2:
sc->sc_lastecmd = MTE_COMPLETE;
case 1:
break;
default:
log(LOG_ERR, "mt%d readdsj: DSJ 0x%x\n", unit, sc->sc_lastdsj);
return (-1);
}
getstats:
retval = hpibrecv(sc->sc_hpibno,
(sc->sc_flags & MTF_STATCONT) ? -1 : sc->sc_slave,
MTT_STAT, ((char *)&(sc->sc_stat)) + sc->sc_statindex,
sizeof(sc->sc_stat) - sc->sc_statindex);
sc->sc_flags &= ~(MTF_STATTIMEO | MTF_STATCONT);
if (retval != sizeof(sc->sc_stat) - sc->sc_statindex) {
if (sc->sc_recvtimeo == 0)
sc->sc_recvtimeo = hz;
if (--sc->sc_recvtimeo != 0) {
if (retval >= 0) {
sc->sc_statindex += retval;
sc->sc_flags |= MTF_STATCONT;
}
sc->sc_flags |= MTF_STATTIMEO;
return (-2);
}
log(LOG_ERR, "mt%d readdsj: can't read status\n", unit);
return (-1);
}
sc->sc_recvtimeo = 0;
sc->sc_statindex = 0;
dlog(LOG_DEBUG, "mt%d readdsj: status is %x %x %x %x %x %x\n", unit,
sc->sc_stat1, sc->sc_stat2, sc->sc_stat3,
sc->sc_stat4, sc->sc_stat5, sc->sc_stat6);
if (sc->sc_lastecmd)
(void) hpibsend(sc->sc_hpibno, sc->sc_slave,
MTL_ECMD, &(sc->sc_lastecmd), 1);
return ((int) sc->sc_lastdsj);
}
mtopen(dev, flag, mode, p)
dev_t dev;
int flag, mode;
struct proc *p;
{
register int unit = UNIT(dev);
register struct mt_softc *sc = &mt_softc[unit];
register int req_den;
int error;
dlog(LOG_DEBUG, "mt%d open: flags 0x%x\n", unit, sc->sc_flags);
if (unit >= NMT || (sc->sc_flags & MTF_EXISTS) == 0)
return (ENXIO);
if (sc->sc_flags & MTF_OPEN)
return (EBUSY);
sc->sc_flags |= MTF_OPEN;
sc->sc_ttyp = tprintf_open(p);
if ((sc->sc_flags & MTF_ALIVE) == 0) {
error = mtcommand(dev, MTRESET, 0);
if (error != 0 || (sc->sc_flags & MTF_ALIVE) == 0)
goto errout;
if ((sc->sc_stat1 & (SR1_BOT | SR1_ONLINE)) == SR1_ONLINE)
(void) mtcommand(dev, MTREW, 0);
}
for (;;) {
if ((error = mtcommand(dev, MTNOP, 0)) != 0)
goto errout;
if (!(sc->sc_flags & MTF_REW))
break;
if (tsleep((caddr_t) &lbolt, PCATCH | (PZERO + 1), "mt", 0) != 0) {
error = EINTR;
goto errout;
}
}
if ((flag & FWRITE) && (sc->sc_stat1 & SR1_RO)) {
error = EROFS;
goto errout;
}
if (!(sc->sc_stat1 & SR1_ONLINE)) {
uprintf("%s: not online\n", sc->sc_hd->hp_xname);
error = EIO;
goto errout;
}
/*
* Select density:
* - find out what density the drive is set to
* (i.e. the density of the current tape)
* - if we are going to write
* - if we're not at the beginning of the tape
* - complain if we want to change densities
* - otherwise, select the mtcommand to set the density
*
* If the drive doesn't support it then don't change the recorded
* density.
*
* The original MOREbsd code had these additional conditions
* for the mid-tape change
*
* req_den != T_BADBPI &&
* sc->sc_density != T_6250BPI
*
* which suggests that it would be possible to write multiple
* densities if req_den == T_BAD_BPI or the current tape
* density was 6250. Testing of our 7980 suggests that the
* device cannot change densities mid-tape.
*
* ajv@comp.vuw.ac.nz
*/
sc->sc_density = (sc->sc_stat2 & SR2_6250) ? T_6250BPI : (
(sc->sc_stat3 & SR3_1600) ? T_1600BPI : (
(sc->sc_stat3 & SR3_800) ? T_800BPI : -1));
req_den = (dev & T_DENSEL);
if (flag & FWRITE) {
if (!(sc->sc_stat1 & SR1_BOT)) {
if (sc->sc_density != req_den) {
uprintf("%s: can't change density mid-tape\n",
sc->sc_hd->hp_xname);
error = EIO;
goto errout;
}
}
else {
int mtset_density =
(req_den == T_800BPI ? MTSET800BPI : (
req_den == T_1600BPI ? MTSET1600BPI : (
req_den == T_6250BPI ? MTSET6250BPI : (
sc->sc_type == MT7980ID
? MTSET6250DC
: MTSET6250BPI))));
if (mtcommand(dev, mtset_density, 0) == 0)
sc->sc_density = req_den;
}
}
return (0);
errout:
sc->sc_flags &= ~MTF_OPEN;
return (error);
}
mtclose(dev, flag)
dev_t dev;
int flag;
{
register struct mt_softc *sc = &mt_softc[UNIT(dev)];
if (sc->sc_flags & MTF_WRT) {
(void) mtcommand(dev, MTWEOF, 2);
(void) mtcommand(dev, MTBSF, 0);
}
if ((minor(dev) & T_NOREWIND) == 0)
(void) mtcommand(dev, MTREW, 0);
sc->sc_flags &= ~MTF_OPEN;
tprintf_close(sc->sc_ttyp);
return (0);
}
mtcommand(dev, cmd, cnt)
dev_t dev;
int cmd;
int cnt;
{
register struct buf *bp = &mtbuf[UNIT(dev)];
int error = 0;
#if 1
if (bp->b_flags & B_BUSY)
return (EBUSY);
#endif
bp->b_cmd = cmd;
bp->b_dev = dev;
do {
bp->b_flags = B_BUSY | B_CMD;
mtstrategy(bp);
iowait(bp);
if (bp->b_flags & B_ERROR) {
error = (int) (unsigned) bp->b_error;
break;
}
} while (--cnt > 0);
#if 0
bp->b_flags = 0 /*&= ~B_BUSY*/;
#else
bp->b_flags &= ~B_BUSY;
#endif
return (error);
}
/*
* Only thing to check here is for legal record lengths (writes only).
*/
void
mtstrategy(bp)
register struct buf *bp;
{
register struct mt_softc *sc;
register struct buf *dp;
register int unit;
register int s;
unit = UNIT(bp->b_dev);
sc = &mt_softc[unit];
dlog(LOG_DEBUG, "mt%d strategy\n", unit);
if ((bp->b_flags & (B_CMD | B_READ)) == 0) {
#define WRITE_BITS_IGNORED 8
#if 0
if (bp->b_bcount & ((1 << WRITE_BITS_IGNORED) - 1)) {
tprintf(sc->sc_ttyp,
"%s: write record must be multiple of %d\n",
sc->sc_hd->hp_xname, 1 << WRITE_BITS_IGNORED);
goto error;
}
#endif
s = 16 * 1024;
if (sc->sc_stat2 & SR2_LONGREC) {
switch (sc->sc_density) {
case T_1600BPI:
s = 32 * 1024;
break;
case T_6250BPI:
case T_BADBPI:
s = 60 * 1024;
break;
}
}
if (bp->b_bcount > s) {
tprintf(sc->sc_ttyp,
"%s: write record (%d) too big: limit (%d)\n",
sc->sc_hd->hp_xname, bp->b_bcount, s);
error:
bp->b_flags |= B_ERROR;
bp->b_error = EIO;
iodone(bp);
return;
}
}
dp = &mttab[unit];
bp->b_actf = NULL;
s = splbio();
bp->b_actb = dp->b_actb;
*dp->b_actb = bp;
dp->b_actb = &bp->b_actf;
if (dp->b_active == 0) {
dp->b_active = 1;
mtustart(unit);
}
splx(s);
}
void
mtustart(unit)
register int unit;
{
dlog(LOG_DEBUG, "mt%d ustart\n", unit);
if (hpibreq(&(mt_softc[unit].sc_dq)))
mtstart(unit);
}
#define hpibppclear(unit) \
{ hpib_softc[unit].sc_flags &= ~HPIBF_PPOLL; }
void
spl_mtintr(arg)
void *arg;
{
struct mt_softc *sc = arg;
int s = splbio();
hpibppclear(sc->sc_hpibno);
mtintr(sc);
(void) splx(s);
}
void
spl_mtstart(unit)
int unit;
{
int s = splbio();
mtstart(unit);
(void) splx(s);
}
void
mtstart(unit)
register int unit;
{
register struct mt_softc *sc = &mt_softc[unit];
register struct buf *bp, *dp;
short cmdcount = 1;
u_char cmdbuf[2];
dlog(LOG_DEBUG, "mt%d start\n", unit);
sc->sc_flags &= ~MTF_WRT;
bp = mttab[unit].b_actf;
if ((sc->sc_flags & MTF_ALIVE) == 0 &&
((bp->b_flags & B_CMD) == 0 || bp->b_cmd != MTRESET))
goto fatalerror;
if (sc->sc_flags & MTF_REW) {
if (!hpibpptest(sc->sc_hpibno, sc->sc_slave))
goto stillrew;
switch (mtreaddsj(unit, MTE_DSJ_FORCE|MTE_COMPLETE|MTE_IDLE)) {
case 0:
case 1:
stillrew:
if ((sc->sc_stat1 & SR1_BOT) ||
!(sc->sc_stat1 & SR1_ONLINE)) {
sc->sc_flags &= ~MTF_REW;
break;
}
case -2:
/*
* -2 means "timeout" reading DSJ, which is probably
* temporary. This is considered OK when doing a NOP,
* but not otherwise.
*/
if (sc->sc_flags & (MTF_DSJTIMEO | MTF_STATTIMEO)) {
timeout(spl_mtstart, (void *)unit, hz >> 5);
return;
}
case 2:
if (bp->b_cmd != MTNOP || !(bp->b_flags & B_CMD)) {
bp->b_error = EBUSY;
goto errdone;
}
goto done;
default:
goto fatalerror;
}
}
if (bp->b_flags & B_CMD) {
if (sc->sc_flags & MTF_PASTEOT) {
switch(bp->b_cmd) {
case MTFSF:
case MTWEOF:
case MTFSR:
bp->b_error = ENOSPC;
goto errdone;
case MTBSF:
case MTOFFL:
case MTBSR:
case MTREW:
sc->sc_flags &= ~(MTF_PASTEOT | MTF_ATEOT);
break;
}
}
switch(bp->b_cmd) {
case MTFSF:
if (sc->sc_flags & MTF_HITEOF)
goto done;
cmdbuf[0] = MTTC_FSF;
break;
case MTBSF:
if (sc->sc_flags & MTF_HITBOF)
goto done;
cmdbuf[0] = MTTC_BSF;
break;
case MTOFFL:
sc->sc_flags |= MTF_REW;
cmdbuf[0] = MTTC_REWOFF;
break;
case MTWEOF:
cmdbuf[0] = MTTC_WFM;
break;
case MTBSR:
cmdbuf[0] = MTTC_BSR;
break;
case MTFSR:
cmdbuf[0] = MTTC_FSR;
break;
case MTREW:
sc->sc_flags |= MTF_REW;
cmdbuf[0] = MTTC_REW;
break;
case MTNOP:
/*
* NOP is supposed to set status bits.
* Force readdsj to do it.
*/
switch (mtreaddsj(unit,
MTE_DSJ_FORCE | MTE_COMPLETE | MTE_IDLE)) {
default:
goto done;
case -1:
/*
* If this fails, perform a device clear
* to fix any protocol problems and (most
* likely) get the status.
*/
bp->b_cmd = MTRESET;
break;
case -2:
timeout(spl_mtstart, (void *)unit, hz >> 5);
return;
}
case MTRESET:
/*
* 1) selected device clear (send with "-2" secondary)
* 2) set timeout, then wait for "service request"
* 3) interrupt will read DSJ (and END COMPLETE-IDLE)
*/
if (hpibsend(sc->sc_hpibno, sc->sc_slave, -2, NULL, 0)){
log(LOG_ERR, "mt%d can't reset\n", unit);
goto fatalerror;
}
timeout(spl_mtintr, (void *)sc, 4 * hz);
hpibawait(sc->sc_hpibno, sc->sc_slave);
return;
case MTSET800BPI:
cmdbuf[0] = MTTC_800;
break;
case MTSET1600BPI:
cmdbuf[0] = MTTC_1600;
break;
case MTSET6250BPI:
cmdbuf[0] = MTTC_6250;
break;
case MTSET6250DC:
cmdbuf[0] = MTTC_DC6250;
break;
}
} else {
if (sc->sc_flags & MTF_PASTEOT) {
bp->b_error = ENOSPC;
goto errdone;
}
if (bp->b_flags & B_READ) {
sc->sc_flags |= MTF_IO;
cmdbuf[0] = MTTC_READ;
} else {
sc->sc_flags |= MTF_WRT | MTF_IO;
cmdbuf[0] = MTTC_WRITE;
cmdbuf[1] = (bp->b_bcount + ((1 << WRITE_BITS_IGNORED) - 1)) >> WRITE_BITS_IGNORED;
cmdcount = 2;
}
}
if (hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_TCMD, cmdbuf, cmdcount)
== cmdcount) {
if (sc->sc_flags & MTF_REW)
goto done;
hpibawait(sc->sc_hpibno);
return;
}
fatalerror:
/*
* If anything fails, the drive is probably hosed, so mark it not
* "ALIVE" (but it EXISTS and is OPEN or we wouldn't be here, and
* if, last we heard, it was REWinding, remember that).
*/
sc->sc_flags &= MTF_EXISTS | MTF_OPEN | MTF_REW;
bp->b_error = EIO;
errdone:
bp->b_flags |= B_ERROR;
done:
sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF);
iodone(bp);
if (dp = bp->b_actf)
dp->b_actb = bp->b_actb;
else
mttab[unit].b_actb = bp->b_actb;
*bp->b_actb = dp;
hpibfree(&(sc->sc_dq));
if ((bp = dp) == NULL)
mttab[unit].b_active = 0;
else
mtustart(unit);
}
/*
* The Utah code had a bug which meant that the driver was unable to read.
* "rw" was initialized to bp->b_flags & B_READ before "bp" was initialized.
* -- ajv@comp.vuw.ac.nz
*/
void
mtgo(unit)
register int unit;
{
register struct mt_softc *sc = &mt_softc[unit];
register struct buf *bp;
int rw;
dlog(LOG_DEBUG, "mt%d go\n", unit);
bp = mttab[unit].b_actf;
rw = bp->b_flags & B_READ;
hpibgo(sc->sc_hpibno, sc->sc_slave, rw ? MTT_READ : MTL_WRITE,
bp->b_un.b_addr, bp->b_bcount, rw, rw != 0);
}
int
mtintr(arg)
void *arg;
{
register struct mt_softc *sc = arg;
register struct buf *bp, *dp;
register int i;
int unit = sc->sc_hd->hp_unit;
u_char cmdbuf[4];
bp = mttab[unit].b_actf;
if (bp == NULL) {
log(LOG_ERR, "mt%d intr: bp == NULL\n", unit);
return;
}
dlog(LOG_DEBUG, "mt%d intr\n", unit);
/*
* Some operation completed. Read status bytes and report errors.
* Clear EOF flags here `cause they're set once on specific conditions
* below when a command succeeds.
* A DSJ of 2 always means keep waiting. If the command was READ
* (and we're in data DMA phase) stop data transfer first.
*/
sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF);
if ((bp->b_flags & (B_CMD|B_READ)) == B_READ &&
!(sc->sc_flags & (MTF_IO | MTF_STATTIMEO | MTF_DSJTIMEO))){
cmdbuf[0] = MTE_STOP;
(void) hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_ECMD,cmdbuf,1);
}
switch (mtreaddsj(unit, 0)) {
case 0:
break;
case 1:
/*
* If we're in the middle of a READ/WRITE and have yet to
* start the data transfer, a DSJ of one should terminate it.
*/
sc->sc_flags &= ~MTF_IO;
break;
case 2:
(void) hpibawait(sc->sc_hpibno);
return;
case -2:
/*
* -2 means that the drive failed to respond quickly enough
* to the request for DSJ. It's probably just "busy" figuring
* it out and will know in a little bit...
*/
timeout(spl_mtintr, (void *)sc, hz >> 5);
return;
default:
log(LOG_ERR, "mt%d intr: can't get drive stat\n", unit);
goto error;
}
if (sc->sc_stat1 & (SR1_ERR | SR1_REJECT)) {
i = sc->sc_stat4 & SR4_ERCLMASK;
log(LOG_ERR, "%s: %s error, retry %d, SR2/3 %x/%x, code %d\n",
sc->sc_hd->hp_xname, i == SR4_DEVICE ? "device" :
(i == SR4_PROTOCOL ? "protocol" :
(i == SR4_SELFTEST ? "selftest" : "unknown")),
sc->sc_stat4 & SR4_RETRYMASK, sc->sc_stat2,
sc->sc_stat3, sc->sc_stat5);
if ((bp->b_flags & B_CMD) && bp->b_cmd == MTRESET)
untimeout(spl_mtintr, (void *)sc);
if (sc->sc_stat3 & SR3_POWERUP)
sc->sc_flags &= MTF_OPEN | MTF_EXISTS;
goto error;
}
/*
* Report and clear any soft errors.
*/
if (sc->sc_stat1 & SR1_SOFTERR) {
log(LOG_WARNING, "%s: soft error, retry %d\n",
sc->sc_hd->hp_xname, sc->sc_stat4 & SR4_RETRYMASK);
sc->sc_stat1 &= ~SR1_SOFTERR;
}
/*
* We've initiated a read or write, but haven't actually started to
* DMA the data yet. At this point, the drive's ready.
*/
if (sc->sc_flags & MTF_IO) {
sc->sc_flags &= ~MTF_IO;
if (hpibustart(sc->sc_hpibno))
mtgo(unit);
return;
}
/*
* Check for End Of Tape - we're allowed to hit EOT and then write (or
* read) one more record. If we get here and have not already hit EOT,
* return ENOSPC to inform the process that it's hit it. If we get
* here and HAVE already hit EOT, don't allow any more operations that
* move the tape forward.
*/
if (sc->sc_stat1 & SR1_EOT) {
if (sc->sc_flags & MTF_ATEOT)
sc->sc_flags |= MTF_PASTEOT;
else {
bp->b_flags |= B_ERROR;
bp->b_error = ENOSPC;
sc->sc_flags |= MTF_ATEOT;
}
}
/*
* If a motion command was being executed, check for Tape Marks.
* If we were doing data, make sure we got the right amount, and
* check for hitting tape marks on reads.
*/
if (bp->b_flags & B_CMD) {
if (sc->sc_stat1 & SR1_EOF) {
if (bp->b_cmd == MTFSR)
sc->sc_flags |= MTF_HITEOF;
if (bp->b_cmd == MTBSR)
sc->sc_flags |= MTF_HITBOF;
}
if (bp->b_cmd == MTRESET) {
untimeout(spl_mtintr, (void *)sc);
sc->sc_flags |= MTF_ALIVE;
}
} else {
i = hpibrecv(sc->sc_hpibno, sc->sc_slave, MTT_BCNT, cmdbuf, 2);
if (i != 2) {
log(LOG_ERR, "mt%d intr: can't get xfer length\n");
goto error;
}
i = (int) *((u_short *) cmdbuf);
if (i <= bp->b_bcount) {
if (i == 0)
sc->sc_flags |= MTF_HITEOF;
bp->b_resid = bp->b_bcount - i;
dlog(LOG_DEBUG, "mt%d intr: bcount %d, resid %d\n",
unit, bp->b_bcount, bp->b_resid);
} else {
tprintf(sc->sc_ttyp,
"%s: record (%d) larger than wanted (%d)\n",
sc->sc_hd->hp_xname, i, bp->b_bcount);
error:
sc->sc_flags &= ~MTF_IO;
bp->b_error = EIO;
bp->b_flags |= B_ERROR;
}
}
/*
* The operation is completely done.
* Let the drive know with an END command.
*/
cmdbuf[0] = MTE_COMPLETE | MTE_IDLE;
(void) hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_ECMD, cmdbuf, 1);
bp->b_flags &= ~B_CMD;
iodone(bp);
if (dp = bp->b_actf)
dp->b_actb = bp->b_actb;
else
mttab[unit].b_actb = bp->b_actb;
*bp->b_actb = dp;
hpibfree(&(sc->sc_dq));
#if 0
if (bp /*mttab[unit].b_actf*/ == NULL)
#else
if (mttab[unit].b_actf == NULL)
#endif
mttab[unit].b_active = 0;
else
mtustart(unit);
}
mtread(dev, uio)
dev_t dev;
struct uio *uio;
{
return(physio(mtstrategy, &mtbuf[UNIT(dev)], dev, B_READ, minphys, uio));
}
mtwrite(dev, uio)
dev_t dev;
struct uio *uio;
{
return(physio(mtstrategy, &mtbuf[UNIT(dev)], dev, B_WRITE, minphys, uio));
}
mtioctl(dev, cmd, data, flag)
dev_t dev;
u_long cmd;
caddr_t data;
int flag;
{
register 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 MTOFFL:
case MTREW:
case MTNOP:
cnt = 0;
break;
default:
return (EINVAL);
}
return (mtcommand(dev, op->mt_op, cnt));
case MTIOCGET:
break;
default:
return (EINVAL);
}
return (0);
}
/*ARGSUSED*/
mtdump(dev)
dev_t dev;
{
return(ENXIO);
}
#endif /* NMT > 0 */
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