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Code Issues Releases Activity

Re-arrange the code to upload an SCB to ensure that there is at least

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on instruction between the last load into the DFIFO and enabling the DMA.
During back to back SCB DMA, it was possible to hang the card.
This commit is contained in:
Justin T. Gibbs 1997-03-24 05:02:55 +00:00
parent 9505c10438
commit 23e11becca
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=24175
1 changed files with 12 additions and 14 deletions
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26
sys/dev/aic7xxx/aic7xxx.seq
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@ -1039,7 +1039,18 @@ dma_scb:
mov DFCNTRL, DMAPARAMS;
test DMAPARAMS, DIRECTION jnz dma_scb_fromhost;
/* Fill it with the SCB data */
call copy_scb_tofifo;
copy_scb_tofifo:
mvi SINDEX, SCB_CONTROL;
add A, 28, SINDEX;
copy_scb_tofifo_loop:
mov DFDAT,SINDIR;
mov DFDAT,SINDIR;
mov DFDAT,SINDIR;
mov DFDAT,SINDIR;
mov DFDAT,SINDIR;
mov DFDAT,SINDIR;
mov DFDAT,SINDIR;
cmp SINDEX, A jne copy_scb_tofifo_loop;
or DFCNTRL, HDMAEN|FIFOFLUSH;
dma_scb_fromhost:
call dma_finish;
@ -1060,19 +1071,6 @@ dfdat_in_7_continued:
mov DINDIR,DFDAT;
mov DINDIR,DFDAT ret;
copy_scb_tofifo:
mvi SCB_CONTROL call dfdat_out_7;
call dfdat_out_7;
call dfdat_out_7;
dfdat_out_7:
mov DFDAT,SINDIR;
mov DFDAT,SINDIR;
mov DFDAT,SINDIR;
mov DFDAT,SINDIR;
mov DFDAT,SINDIR;
mov DFDAT,SINDIR;
mov DFDAT,SINDIR ret;
/*
* Wait for DMA from host memory to data FIFO to complete, then disable
* DMA and wait for it to acknowledge that it's off.