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Commit 6e8a0d11 authored by Paul Mundt's avatar Paul Mundt
Browse files

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



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: default avatarPaul Mundt <lethal@linux-sh.org>
parent a781d1e5

arch/sh/kernel/cpu/init.c

+4 −9
Original line number Diff line number Diff line
@@ -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();