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If, during an SDTR negotiation, the target comes back with a response

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that is too low for the aic7xxx chip to handle with sync transfers,
negotiate async transfers.
This commit is contained in:
Justin T. Gibbs 1996-10-06 19:43:36 +00:00
parent fa79187367
commit 020f6d4ee5
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=18772
1 changed files with 24 additions and 10 deletions
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34
sys/i386/scsi/aic7xxx.c
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@ -31,7 +31,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: aic7xxx.c,v 1.76 1996/10/01 03:01:06 pst Exp $
* $Id: aic7xxx.c,v 1.77 1996/10/06 16:38:25 gibbs Exp $
*/
/*
* TODO:
@ -1361,6 +1361,7 @@ ahc_handle_seqint(ahc, intstat)
{
u_int8_t period;
u_int8_t offset;
u_int8_t saved_offset;
u_int8_t targ_scratch;
u_int8_t maxoffset;
u_int8_t rate;
@ -1371,14 +1372,14 @@ ahc_handle_seqint(ahc, intstat)
break;
}
period = AHC_INB(ahc, MSGIN_EXT_BYTE0);
offset = AHC_INB(ahc, MSGIN_EXT_BYTE1);
saved_offset = AHC_INB(ahc, MSGIN_EXT_BYTE1);
targ_scratch = AHC_INB(ahc, TARG_SCRATCH
+ scratch_offset);
if (targ_scratch & WIDEXFER)
maxoffset = MAX_OFFSET_16BIT;
else
maxoffset = MAX_OFFSET_8BIT;
offset = MIN(offset, maxoffset);
offset = MIN(saved_offset, maxoffset);
ahc_scsirate(ahc, &rate, &period, &offset,
channel, target);
/* Preserve the WideXfer flag */
@ -1392,13 +1393,20 @@ ahc_handle_seqint(ahc, intstat)
targ_scratch);
AHC_OUTB(ahc, SCSIRATE, targ_scratch);
/* See if we initiated Sync Negotiation */
if (ahc->sdtrpending & targ_mask) {
/*
* See if we initiated Sync Negotiation
* and didn't have to fall down to async
* transfers.
*/
if ((ahc->sdtrpending & targ_mask) != 0
&& (saved_offset == offset)) {
/*
* Don't send an SDTR back to
* the target
*/
AHC_OUTB(ahc, RETURN_1, 0);
ahc->needsdtr &= ~targ_mask;
ahc->sdtrpending &= ~targ_mask;
} else {
/*
* Send our own SDTR in reply
@ -1410,12 +1418,18 @@ ahc_handle_seqint(ahc, intstat)
ahc_construct_sdtr(ahc, /*start_byte*/0,
period, offset);
AHC_OUTB(ahc, RETURN_1, SEND_MSG);
/*
* If we aren't starting a re-negotiation
* because we had to go async in response
* to a "too low" response from the target
* clear the needsdtr flag for this target.
*/
if ((ahc->sdtrpending & targ_mask) == 0)
ahc->needsdtr &= ~targ_mask;
else
ahc->sdtrpending |= targ_mask;
}
/*
* Negate the flags
*/
ahc->needsdtr &= ~targ_mask;
ahc->sdtrpending &= ~targ_mask;
break;
}
case MSG_EXT_WDTR: