[v3 1/2] ARM: Add API to detect SCU base address from CP15

Hiroshi Doyu
2013-01-22T05:52:42Z

Add API to detect SCU base address from CP15.

Signed-off-by: Hiroshi Doyu <hdoyu@nvidia.com>
---
Update: Use Russell's suggestion,
http://lists.infradead.org/pipermail/linux-arm-kernel/2013-January/143321.html
---
arch/arm/include/asm/smp_scu.h | 17 +++++++++++++++++
1 file changed, 17 insertions(+)

diff --git a/arch/arm/include/asm/smp_scu.h b/arch/arm/include/asm/smp_scu.h
index 4eb6d00..006f026 100644
--- a/arch/arm/include/asm/smp_scu.h
+++ b/arch/arm/include/asm/smp_scu.h
@@ -6,6 +6,23 @@
#define SCU_PM_POWEROFF 3

#ifndef __ASSEMBLER__
+
+#include <asm/cputype.h>
+
+static inline bool scu_a9_has_base(void)
+{
+ return read_cpuid_part_number() == ARM_CPU_PART_CORTEX_A9;
+}
+
+static inline unsigned long scu_a9_get_base(void)
+{
+ unsigned long pa;
+
+ asm("mrc p15, 4, %0, c15, c0, 0" : "=r" (pa));
+
+ return pa;
+}
+
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