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LEON3: change d-cache snoop detect implementation

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PR 2010/bsps

The previous code only checked if d-cache snooping was implemented,
however snooping may be available but not enabled which may lead
to driver bugs.

Signed-off-by: Daniel Hellstrom <daniel@gaisler.com>
This commit is contained in:
Daniel Hellstrom
2012-02-02 08:46:27 -06:00
committed by Joel Sherrill
parent 45eaf8ccb4
commit 9591970856
1 changed files with 5 additions and 7 deletions
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12
c/src/lib/libbsp/sparc/leon3/startup/bspstart.c
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@@ -36,19 +36,17 @@ extern void amba_initialize(void);
* set_snooping
*
* Read the data cache configuration register to determine if
* bus snooping is available. This is needed for some drivers so
* that they can select the most efficient copy routines.
*
* bus snooping is available and enabled. This is needed for some
* drivers so that they can select the most efficient copy routines.
*/
static inline int set_snooping(void)
{
int tmp;
asm(" lda [%1] 2, %0 "
__asm__ (" lda [%%g0] 2, %0 "
: "=r"(tmp)
: "r"(0xC)
:
);
return (tmp >> 27) & 1;
return (tmp >> 23) & 1;
}
/* ASM-function used to get the CPU-Index on calling LEON3 CPUs */