arm64: add Cortex-A57 erratum 832075 workaround

The ARM erratum 832075 applies to certain revisions of Cortex-A57,
one of the workarounds is to change device loads into using
load-aquire semantics.
This is achieved using the alternatives framework.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c
index e107ed2d66dc..30935d2da55a 100644
--- a/arch/arm64/kernel/cpu_errata.c
+++ b/arch/arm64/kernel/cpu_errata.c
@@ -24,6 +24,7 @@
 #include <asm/cpufeature.h>
 
 #define MIDR_CORTEX_A53 MIDR_CPU_PART(ARM_CPU_IMP_ARM, ARM_CPU_PART_CORTEX_A53)
+#define MIDR_CORTEX_A57 MIDR_CPU_PART(ARM_CPU_IMP_ARM, ARM_CPU_PART_CORTEX_A57)
 
 /*
  * Add a struct or another datatype to the union below if you need
@@ -71,6 +72,12 @@ struct arm64_cpu_capabilities arm64_errata[] = {
                 MIDR_RANGE(MIDR_CORTEX_A53, 0x00, 0x02),
         },
         {
+        /* Cortex-A57 r0p0 - r1p2 */
+                .desc = "ARM erratum 832075",
+                .capability = ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE,
+                MIDR_RANGE(MIDR_CORTEX_A57, 0x00, 0x12),
+        },
+        {
         }
 };