[v2 1/1] ARM: Add API to detect SCU base address from CP15
From: Hiroshi Doyu <hidden>
Date: 2013-01-21 07:42:55
Also in:
linux-tegra
Subsystem:
arm port, the rest · Maintainers:
Russell King, Linus Torvalds
Add API to detect SCU base address from CP15. Signed-off-by: Hiroshi Doyu <redacted> Acked-by: Santosh Shilimkar <redacted> --- 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