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Change the way Automatic PIO is performed in the mesgin and mesgout phases.

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SPIORDY should go active on any REQ of the bus, so testing for REQINIT is
not necessary.  It also seems that testing for SPIORDY is more robust then
REQINIT since SPIORDY comes active after REQINIT and PHASEMIS seems to take
some time to come true after REQ is asserted if the phase has changed.  Of
course, none of this is documented.

This should give the code savings of my original changes, without breaking the
driver on fast peripherals.
This commit is contained in:
Justin T. Gibbs 1996-11-21 06:18:33 +00:00
parent dacc975297
commit ad34debda8
1 changed files with 18 additions and 27 deletions
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45
sys/dev/aic7xxx/aic7xxx.seq
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@ -39,7 +39,7 @@
*
*-M************************************************************************/
VERSION AIC7XXX_SEQ_VER "$Id: aic7xxx.seq,v 1.48 1996/11/11 05:16:36 gibbs Exp $"
VERSION AIC7XXX_SEQ_VER "$Id: aic7xxx.seq,v 1.49 1996/11/16 01:07:34 gibbs Exp $"
#if defined(__NetBSD__)
#include "../../../../dev/ic/aic7xxxreg.h"
@ -536,36 +536,27 @@ p_mesgout_start:
* a MESSAGE REJECT.
*/
p_mesgout_loop:
test SSTAT1,REQINIT jz p_mesgout_loop
test SSTAT1,PHASEMIS jnz p_mesgout_phasemis
cmp DINDEX,1 jne p_mesgout_outb /* last byte? */
mvi CLRSINT1,CLRATNO /* drop ATN */
p_mesgout_outb:
test SSTAT0, SPIORDY jz p_mesgout_outb
dec DINDEX
mvi CLRSINT1, CLRREQINIT
mov SCSIDATL,SINDIR
p_mesgout4:
test DINDEX,0xff jnz p_mesgout_loop
test SSTAT1,BUSFREE jnz p_mesgout_done
test SSTAT0,SPIORDY jz p_mesgout_loop
test SSTAT1,PHASEMIS jnz p_mesgout_done
/*
* 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_snoop:
test SSTAT1,BUSFREE jnz p_mesgout_done
test SSTAT1,REQINIT jz p_mesgout_snoop
test DINDEX,0xff jnz p_mesgout_outb
or SCSISIGO,ATNO /* turn on ATN for the retry */
jmp p_mesgout_start
p_mesgout_outb:
cmp DINDEX,1 jne p_mesgout_outb2 /* last byte? */
mvi CLRSINT1,CLRATNO /* drop ATN */
p_mesgout_outb2:
dec DINDEX
mvi CLRSINT0, CLRSPIORDY
mov SCSIDATL,SINDIR
jmp p_mesgout_loop
test SSTAT1,PHASEMIS jnz p_mesgout_done
or SCSISIGO,ATNO /* turn on ATNO */
jmp ITloop
p_mesgout_phasemis:
mvi CLRSINT1,CLRATNO /* Be sure to turn ATNO off */
p_mesgout_done:
mvi CLRSINT1,CLRATNO /* Be sure to turn ATNO off */
clr MSG_LEN /* no active msg */
jmp ITloop
@ -906,13 +897,13 @@ mk_mesg1:
inb_next:
call inb_last /* ACK */
inb_next_wait:
test SSTAT1, REQINIT jz inb_next_wait
test SSTAT0, SPIORDY jz inb_next_wait
test SSTAT1,PHASEMIS jnz mesgin_phasemis
inb_first:
mov DINDEX,SINDEX
mov DINDIR,SCSIBUSL ret /*read byte directly from bus*/
inb_last:
mvi CLRSINT1, CLRREQINIT
mvi CLRSINT0, CLRSPIORDY
mov NONE,SCSIDATL ret /*dummy read from latch to ACK*/
mesgin_phasemis: