IXP42x: Identify Intel IXP425 rev. A0 processors.

Signed-off-by: Krzysztof Hałasa <khc@pm.waw.pl>

1 files changed, 6 insertions, 1 deletions

diff --git a/arch/arm/mach-ixp4xx/include/mach/cpu.h b/arch/arm/mach-ixp4xx/include/mach/cpu.h
index def7773be67..b2ef65db0e9 100644
--- a/arch/arm/mach-ixp4xx/include/mach/cpu.h
+++ b/arch/arm/mach-ixp4xx/include/mach/cpu.h
@@ -26,6 +26,8 @@
 #define IXP46X_PROCESSOR_ID_VALUE       0x69054200 /* including IXP455 */
 #define IXP46X_PROCESSOR_ID_MASK        0xfffffff0
 
+#define cpu_is_ixp42x_rev_a0() ((read_cpuid_id() & (IXP42X_PROCESSOR_ID_MASK | 0xF)) == \
+                                IXP42X_PROCESSOR_ID_VALUE)
 #define cpu_is_ixp42x() ((read_cpuid_id() & IXP42X_PROCESSOR_ID_MASK) == \
                          IXP42X_PROCESSOR_ID_VALUE)
 #define cpu_is_ixp43x() ((read_cpuid_id() & IXP43X_PROCESSOR_ID_MASK) == \
@@ -35,8 +37,11 @@
 
 static inline u32 ixp4xx_read_feature_bits(void)
 {
-        unsigned int val = ~*IXP4XX_EXP_CFG2;
+        u32 val = ~*IXP4XX_EXP_CFG2;
 
+        if (cpu_is_ixp42x_rev_a0())
+                return IXP42X_FEATURE_MASK & ~(IXP4XX_FEATURE_RCOMP |
+                                               IXP4XX_FEATURE_AES);
         if (cpu_is_ixp42x())
                 return val & IXP42X_FEATURE_MASK;
         if (cpu_is_ixp43x())