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authorCatalin Marinas <catalin.marinas@arm.com>2009-04-30 17:06:03 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2009-04-30 20:12:47 +0100
commit9cba3ccc8fe77b67aff2db8f5827d7cb752ce11f (patch)
treecb73cbaa3c197180b7f9d829561121197a8c69db /arch/arm/mm/cache-v6.S
parent10993374f84cc1c4100aea9eca7fa154518ffc5e (diff)
[ARM] 5488/1: ARM errata: Invalidation of the Instruction Cache operation can fail
This patch implements the recommended workaround for erratum 411920 (ARM1136, ARM1156, ARM1176). Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mm/cache-v6.S')
-rw-r--r--arch/arm/mm/cache-v6.S33
1 files changed, 33 insertions, 0 deletions
diff --git a/arch/arm/mm/cache-v6.S b/arch/arm/mm/cache-v6.S
index 2c6c2a7c05a0..8f5c13f4c936 100644
--- a/arch/arm/mm/cache-v6.S
+++ b/arch/arm/mm/cache-v6.S
@@ -20,6 +20,31 @@
#define D_CACHE_LINE_SIZE 32
#define BTB_FLUSH_SIZE 8
+#ifdef CONFIG_ARM_ERRATA_411920
+/*
+ * Invalidate the entire I cache (this code is a workaround for the ARM1136
+ * erratum 411920 - Invalidate Instruction Cache operation can fail. This
+ * erratum is present in 1136, 1156 and 1176. It does not affect the MPCore.
+ *
+ * Registers:
+ * r0 - set to 0
+ * r1 - corrupted
+ */
+ENTRY(v6_icache_inval_all)
+ mov r0, #0
+ mrs r1, cpsr
+ cpsid ifa @ disable interrupts
+ mcr p15, 0, r0, c7, c5, 0 @ invalidate entire I-cache
+ mcr p15, 0, r0, c7, c5, 0 @ invalidate entire I-cache
+ mcr p15, 0, r0, c7, c5, 0 @ invalidate entire I-cache
+ mcr p15, 0, r0, c7, c5, 0 @ invalidate entire I-cache
+ msr cpsr_cx, r1 @ restore interrupts
+ .rept 11 @ ARM Ltd recommends at least
+ nop @ 11 NOPs
+ .endr
+ mov pc, lr
+#endif
+
/*
* v6_flush_cache_all()
*
@@ -31,8 +56,12 @@ ENTRY(v6_flush_kern_cache_all)
mov r0, #0
#ifdef HARVARD_CACHE
mcr p15, 0, r0, c7, c14, 0 @ D cache clean+invalidate
+#ifndef CONFIG_ARM_ERRATA_411920
mcr p15, 0, r0, c7, c5, 0 @ I+BTB cache invalidate
#else
+ b v6_icache_inval_all
+#endif
+#else
mcr p15, 0, r0, c7, c15, 0 @ Cache clean+invalidate
#endif
mov pc, lr
@@ -103,8 +132,12 @@ ENTRY(v6_coherent_user_range)
mov r0, #0
#ifdef HARVARD_CACHE
mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
+#ifndef CONFIG_ARM_ERRATA_411920
mcr p15, 0, r0, c7, c5, 0 @ I+BTB cache invalidate
#else
+ b v6_icache_inval_all
+#endif
+#else
mcr p15, 0, r0, c7, c5, 6 @ invalidate BTB
#endif
mov pc, lr

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