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sh: Make associative cache writes fatal on all SH-4A parts.

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Now that associative cache writes are no longer needed by the SH-4/SH-4A
cache flush code, associative write support can be explicitly disabled
for all SH-4A parts. This makes any associative write throw an exception,
as this behaviour can not be assumed to exist on future parts.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt 2009-12-04 16:22:11 +09:00
parent a781d1e5ff
commit 6e8a0d11a0
1 changed files with 4 additions and 9 deletions
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13
arch/sh/kernel/cpu/init.c
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@ -75,16 +75,11 @@ static void __init expmask_init(void)
/*
* Future proofing.
*
* Disable support for slottable sleep instruction
* and non-nop instructions in the rte delay slot.
* Disable support for slottable sleep instruction, non-nop
* instructions in the rte delay slot, and associative writes to
* the memory-mapped cache array.
*/
expmask &= ~(EXPMASK_RTEDS | EXPMASK_BRDSSLP);
/*
* Enable associative writes to the memory-mapped cache array
* until the cache flush ops have been rewritten.
*/
expmask |= EXPMASK_MMCAW;
expmask &= ~(EXPMASK_RTEDS | EXPMASK_BRDSSLP | EXPMASK_MMCAW);
__raw_writel(expmask, EXPMASK);
ctrl_barrier();