Add API to detect SCU base address from CP15.
Signed-off-by: Hiroshi Doyu <[email protected]>
Acked-by: Santosh Shilimkar <[email protected]>
---
For usage: http://patchwork.ozlabs.org/patch/212013/
---
arch/arm/include/asm/smp_scu.h | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/arch/arm/include/asm/smp_scu.h b/arch/arm/include/asm/smp_scu.h
index 4eb6d00..1733ec7 100644
--- a/arch/arm/include/asm/smp_scu.h
+++ b/arch/arm/include/asm/smp_scu.h
@@ -6,6 +6,18 @@
#define SCU_PM_POWEROFF 3
#ifndef __ASSEMBLER__
+
+#include <asm/cputype.h>
+
+static inline phys_addr_t scu_get_base(void)
+{
+ if (read_cpuid_part_number() == ARM_CPU_PART_CORTEX_A9) {
+ phys_addr_t pa;
+ asm("mrc p15, 4, %0, c15, c0, 0" : "=r" (pa));
+ return pa;
+ }
+ return 0;
+}
unsigned int scu_get_core_count(void __iomem *);
void scu_enable(void __iomem *);
int scu_power_mode(void __iomem *, unsigned int);
--
1.7.9.5
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