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Reset the DMA control register whenever we reset the sequencer.

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Clear LASTPHASE on busfree so the kernel driver can tell that the
   sequencer is idle.
Fix some comments to reflect reality.
This commit is contained in:
gibbs 1996-03-10 07:02:32 +00:00
parent 8eddee8c6e
commit 14667740f1
2 changed files with 24 additions and 50 deletions
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66
sys/dev/aic7xxx/aic7xxx.seq
View File

@ -41,7 +41,7 @@
*
*-M************************************************************************/
VERSION AIC7XXX_SEQ_VER "$Id: aic7xxx.seq,v 1.29 1996/01/11 06:17:46 gibbs Exp $"
VERSION AIC7XXX_SEQ_VER "$Id: aic7xxx.seq,v 1.30 1996/01/29 03:12:02 gibbs Exp $"
#include "../../dev/aic7xxx/aic7xxx_reg.h"
@ -69,8 +69,14 @@ A = ACCUM
*/
/*
* Initialize any state valid during the idle loop here. This code is
* executed on startup and after every bus free.
* We assume that the kernel driver may reset us at any time, even in the
* middle of a DMA, so clear DFCNTRL too.
*/
reset:
clr DFCNTRL
clr SCSISIGO /* De-assert BSY */
/*
* We jump to start after every bus free.
*/
start:
mvi SCSISEQ,ENRSELI /* Always allow reselection */
@ -373,7 +379,7 @@ dma_finish2:
/*
* Copy data from FIFO into SCB data pointer and data count. This assumes
* that the struct scatterlist has this structure (this and sizeof(struct
* scatterlist) == 12 are asserted in aic7xxx.c):
* scatterlist) == 12 are asserted in aic7xxx.c for the Linux driver):
*
* struct scatterlist {
* char *address; four bytes, little-endian order
@ -382,7 +388,7 @@ dma_finish2:
* }
*
*
* Not in FreeBSD. the scatter list entry is only 8 bytes.
* In FreeBSD, the scatter list entry is only 8 bytes.
*
* struct ahc_dma_seg {
* physaddr addr; four bytes, little-endian order
@ -390,34 +396,23 @@ dma_finish2:
* };
*/
mov HADDR0,DFDAT
mov HADDR1,DFDAT
mov HADDR2,DFDAT
mov HADDR3,DFDAT
/*
* For Linux, we must throw away four bytes since there is a 32bit gap
* in the middle of a struct scatterlist
* in the middle of a struct scatterlist.
*/
#ifdef linux
mov HADDR0,DFDAT
mov HADDR1,DFDAT
mov HADDR2,DFDAT
mov HADDR3,DFDAT
mov NONE,DFDAT
mov NONE,DFDAT
mov NONE,DFDAT
mov NONE,DFDAT
mov HCNT0,DFDAT
mov HCNT1,DFDAT
mov HCNT2,DFDAT
#else
/*
* For FreeBSD, just copy it wholesale
*/
mov HADDR0,DFDAT
mov HADDR1,DFDAT
mov HADDR2,DFDAT
mov HADDR3,DFDAT
mov HCNT0,DFDAT
mov HCNT1,DFDAT
mov HCNT2,DFDAT
#endif
mov HCNT0,DFDAT
mov HCNT1,DFDAT
mov HCNT2,DFDAT
/* Load STCNT as well. It is a mirror of HCNT */
mov STCNT0,HCNT0
@ -787,6 +782,7 @@ mesgin_reject:
*/
p_busfree:
mvi CLRSINT1,CLRATNO
clr LASTPHASE
/*
* if this is an immediate command, perform a psuedo command complete to
@ -795,28 +791,6 @@ p_busfree:
test SCB_CMDLEN,0xff jz status_ok
jmp start
#if 0
/*
* Instead of a generic bcopy routine that requires an argument, we unroll
* the cases that are actually used, and call them explicitly. This
* not only reduces the overhead of doing a bcopy, but ends up saving space
* in the program since you don't have to put the argument into the accumulator
* before the call. Both functions expect DINDEX to contain the destination
* address and SINDEX to contain the source address.
*/
bcopy_7:
mov DINDIR,SINDIR
mov DINDIR,SINDIR
bcopy_5:
mov DINDIR,SINDIR
bcopy_4:
mov DINDIR,SINDIR
bcopy_3:
mov DINDIR,SINDIR
mov DINDIR,SINDIR
mov DINDIR,SINDIR ret
#endif
/*
* Locking the driver out, build a one-byte message passed in SINDEX
* if there is no active message already. SINDEX is returned intact.

8
sys/dev/aic7xxx/aic7xxx_reg.h
View File

@ -18,7 +18,7 @@
* 4. Modifications may be freely made to this file if the above conditions
* are met.
*
* $Id: aic7xxx_reg.h,v 1.4 1996/01/11 06:17:49 gibbs Exp $
* $Id: aic7xxx_reg.h,v 1.5 1996/01/29 03:12:06 gibbs Exp $
*/
/*
@ -397,9 +397,9 @@
#define SEND_REJECT 0x11 /* sending a message reject */
#define NO_IDENT 0x21 /* no IDENTIFY after reconnect*/
#define NO_MATCH 0x31 /* no cmd match for reconnect */
#define SDTR_MSG 0x41 /* SDTR message recieved */
#define WDTR_MSG 0x51 /* WDTR message recieved */
#define REJECT_MSG 0x61 /* Reject message recieved */
#define SDTR_MSG 0x41 /* SDTR message received */
#define WDTR_MSG 0x51 /* WDTR message received */
#define REJECT_MSG 0x61 /* Reject message received */
#define BAD_STATUS 0x71 /* Bad status from target */
#define RESIDUAL 0x81 /* Residual byte count != 0 */
#define ABORT_TAG 0x91 /* Sent an ABORT_TAG message */