d/freebsd-nq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Re-arange the selection and reselection code to hopefully kill the

Browse Source 
spurious selection timeouts that have been reported.
This commit is contained in:
Justin T. Gibbs 1997-04-14 02:26:59 +00:00
parent d7f7f3f20e
commit 45b7cf8750
2 changed files with 31 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
sys/dev/aic7xxx/aic7xxx.reg
View File

@ -28,7 +28,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id$
* $Id: aic7xxx.reg,v 1.1 1997/03/16 07:08:11 gibbs Exp $
*/
/*
@ -773,6 +773,7 @@ scb {
size 1
bit SELBUSB 0x08
mask TID 0xf0
mask LID 0x07
}
SCB_TARGET_STATUS {
size 1

44
sys/dev/aic7xxx/aic7xxx.seq
View File

@ -37,7 +37,7 @@
*OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
*SUCH DAMAGE.
*
* $Id: aic7xxx.seq,v 1.69 1997/04/05 22:03:47 gibbs Exp $
* $Id: aic7xxx.seq,v 1.70 1997/04/10 19:13:05 gibbs Exp $
*
*-M************************************************************************/
@ -71,6 +71,8 @@ reset:
/* Always allow reselection */
mvi SCSISEQ, ENRSELI|ENAUTOATNP;
call clear_target_state;
repoll_for_work:
and SIMODE1, ~ENBUSFREE;
poll_for_work:
test SSTAT0,SELDO jnz select;
test SSTAT0,SELDI jnz reselect;
@ -207,6 +209,14 @@ initialize_scsiid:
*/
reselect:
clr MSG_LEN; /* Don't have anything in the mesg buffer */
mvi CLRSINT1,CLRBUSFREE;
or SIMODE1, ENBUSFREE; /*
* We aren't expecting a
* bus free, so interrupt
* the kernel driver if it
* happens.
*/
test SSTAT0, SELDI jz repoll_for_work;/* False alarm? */
mvi CLRSINT0, CLRSELDI;
/* XXX test for and handle ONE BIT condition */
and SAVED_TCL, SELID_MASK, SELID;
@ -220,14 +230,25 @@ reselect:
* SCB is used, so don't bother with it now.
*/
select:
/* Turn off the selection hardware */
mov SCBPTR, WAITING_SCBH;
mvi CLRSINT1,CLRBUSFREE;
mvi SCSISEQ, ENRSELI|ENAUTOATNP; /*
* ATN on parity errors
* for "in" phases
*/
mvi CLRSINT0, CLRSELDO;
mov SCBPTR, WAITING_SCBH;
or SIMODE1, ENBUSFREE; /*
* We aren't expecting a
* bus free, so interrupt
* the kernel driver if it
* happens.
*/
test SSTAT0, SELDO jnz select_good;
mvi SCSISEQ, ENSELO|ENAUTOATNO|ENRSELI|ENAUTOATNP;
jmp repoll_for_work;
select_good:
mov WAITING_SCBH,SCB_NEXT;
/* Turn off the selection hardware */
mvi CLRSINT0, CLRSELDO;
mov SAVED_TCL, SCB_TCL;
/*
* As soon as we get a successful selection, the target should go
@ -264,13 +285,6 @@ mk_message:
mvi INTSTAT,AWAITING_MSG;
select2:
mvi CLRSINT1,CLRBUSFREE;
or SIMODE1, ENBUSFREE; /*
* We aren't expecting a
* bus free, so interrupt
* the kernel driver if it
* happens.
*/
/*
* Initialize Ultra mode setting and clear the SCSI channel.
*/
@ -547,13 +561,13 @@ p_mesgout_loop:
* If the next bus phase after ATN drops is a message out, it means
* that the target is requesting that the last message(s) be resent.
*/
p_mesgout_dropatn:
cmp DINDEX,1 jne p_mesgout_testretry;/* last byte? */
mvi CLRSINT1,CLRATNO; /* drop ATN */
p_mesgout_testretry:
test DINDEX,0xff jnz p_mesgout_outb;
test DINDEX,0xff jnz p_mesgout_dropatn;
or SCSISIGO,ATNO,LASTPHASE;/* turn on ATN for the retry */
jmp p_mesgout_start;
p_mesgout_dropatn:
cmp DINDEX,1 jne p_mesgout_outb; /* last byte? */
mvi CLRSINT1,CLRATNO; /* drop ATN */
p_mesgout_outb:
dec DINDEX;
mov SCSIDATL,SINDIR;