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ARM: 6859/1: Add writethrough dcache support for ARM926EJS processor

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The ARM kernel supports writethrough data cache via the
CONFIG_CPU_DCACHE_WRITETHROUGH option.  However, that
functionality wasn't implemented in the arch/arm/boot/compressed
code.  It is now necessary due to a new ARM926EJS processor
that has an issue with writeback data cache.

Signed-off-by: Mark A. Greer <mgreer@mvista.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Mark A. Greer 2011-04-01 15:41:26 +01:00 committed by Russell King
parent 111e9a5ce6
commit af3e4fd37a
1 changed files with 16 additions and 0 deletions
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16
arch/arm/boot/compressed/head.S
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@ -447,7 +447,11 @@ __setup_mmu: sub r3, r4, #16384 @ Page directory size
orr r1, r1, #3 << 10
add r2, r3, #16384
1: cmp r1, r9 @ if virt > start of RAM
#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
orrhs r1, r1, #0x08 @ set cacheable
#else
orrhs r1, r1, #0x0c @ set cacheable, bufferable
#endif
cmp r1, r10 @ if virt > end of RAM
bichs r1, r1, #0x0c @ clear cacheable, bufferable
str r1, [r0], #4 @ 1:1 mapping
@ -472,6 +476,12 @@ __setup_mmu: sub r3, r4, #16384 @ Page directory size
mov pc, lr
ENDPROC(__setup_mmu)
__arm926ejs_mmu_cache_on:
#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
mov r0, #4 @ put dcache in WT mode
mcr p15, 7, r0, c15, c0, 0
#endif
__armv4_mmu_cache_on:
mov r12, lr
#ifdef CONFIG_MMU
@ -653,6 +663,12 @@ proc_types:
W(b) __armv4_mpu_cache_off
W(b) __armv4_mpu_cache_flush
.word 0x41069260 @ ARM926EJ-S (v5TEJ)
.word 0xff0ffff0
b __arm926ejs_mmu_cache_on
b __armv4_mmu_cache_off
b __armv5tej_mmu_cache_flush
.word 0x00007000 @ ARM7 IDs
.word 0x0000f000
mov pc, lr