[RESEND][v3 4/9] ARM: Add API to detect SCU base address from CP15
Hiroshi Doyu
hdoyu at nvidia.com
Fri Jan 18 05:54:40 EST 2013
Add API to detect SCU base address from CP15.
Signed-off-by: Hiroshi Doyu <hdoyu at nvidia.com>
---
NOTE:
This wasn't delivered to linux-arm-kernel at lists.infradead.org, resending....
For usage: http://patchwork.ozlabs.org/patch/212013/
---
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..f619eef 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 phys_addr_t scu_get_base(void)
+{
+ phys_addr_t pa;
+ unsigned long part_number = read_cpuid_part_number();
+
+ switch (part_number) {
+ case ARM_CPU_PART_CORTEX_A9:
+ /* Get SCU physical base */
+ asm("mrc p15, 4, %0, c15, c0, 0" : "=r" (pa));
+ return pa;
+ default:
+ 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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