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authorLeela Krishna Amudala <leela.krishna@linaro.org>2014-05-16 04:23:24 +0900
committerKukjin Kim <kgene.kim@samsung.com>2014-05-16 04:24:24 +0900
commitd3af6976a24f8cebef23e72ade6d91ddd781c12b (patch)
treec58b18b88766f42b97c4d74440dac61cabc1664d
parentd7067f1c5fa0232001502569c6878d22308da268 (diff)
ARM: EXYNOS: Add generic cpu power control functions for exynos SoCs
Add generic cpu power control functions for exynos based SoCS for cpu power up/down and to know the cpu status. Signed-off-by: Leela Krishna Amudala <leela.krishna@linaro.org> Signed-off-by: Abhilash Kesavan <a.kesavan@samsung.com> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
-rw-r--r--arch/arm/mach-exynos/common.h3
-rw-r--r--arch/arm/mach-exynos/pm.c36
-rw-r--r--arch/arm/mach-exynos/regs-pmu.h6
3 files changed, 45 insertions, 0 deletions
diff --git a/arch/arm/mach-exynos/common.h b/arch/arm/mach-exynos/common.h
index 963c51fb606c..4d815a511bc1 100644
--- a/arch/arm/mach-exynos/common.h
+++ b/arch/arm/mach-exynos/common.h
@@ -63,5 +63,8 @@ struct exynos_pmu_conf {
};
extern void exynos_sys_powerdown_conf(enum sys_powerdown mode);
+extern void exynos_cpu_power_down(int cpu);
+extern void exynos_cpu_power_up(int cpu);
+extern int exynos_cpu_power_state(int cpu);
#endif /* __ARCH_ARM_MACH_EXYNOS_COMMON_H */
diff --git a/arch/arm/mach-exynos/pm.c b/arch/arm/mach-exynos/pm.c
index 15af0ceb0a66..cbfe23598236 100644
--- a/arch/arm/mach-exynos/pm.c
+++ b/arch/arm/mach-exynos/pm.c
@@ -100,6 +100,42 @@ static int exynos_irq_set_wake(struct irq_data *data, unsigned int state)
return -ENOENT;
}
+/**
+ * exynos_core_power_down : power down the specified cpu
+ * @cpu : the cpu to power down
+ *
+ * Power down the specified cpu. The sequence must be finished by a
+ * call to cpu_do_idle()
+ *
+ */
+void exynos_cpu_power_down(int cpu)
+{
+ __raw_writel(0, EXYNOS_ARM_CORE_CONFIGURATION(cpu));
+}
+
+/**
+ * exynos_cpu_power_up : power up the specified cpu
+ * @cpu : the cpu to power up
+ *
+ * Power up the specified cpu
+ */
+void exynos_cpu_power_up(int cpu)
+{
+ __raw_writel(S5P_CORE_LOCAL_PWR_EN,
+ EXYNOS_ARM_CORE_CONFIGURATION(cpu));
+}
+
+/**
+ * exynos_cpu_power_state : returns the power state of the cpu
+ * @cpu : the cpu to retrieve the power state from
+ *
+ */
+int exynos_cpu_power_state(int cpu)
+{
+ return (__raw_readl(EXYNOS_ARM_CORE_STATUS(cpu)) &
+ S5P_CORE_LOCAL_PWR_EN);
+}
+
/* For Cortex-A9 Diagnostic and Power control register */
static unsigned int save_arm_register[2];
diff --git a/arch/arm/mach-exynos/regs-pmu.h b/arch/arm/mach-exynos/regs-pmu.h
index 4f6a2560d022..84634ac5b127 100644
--- a/arch/arm/mach-exynos/regs-pmu.h
+++ b/arch/arm/mach-exynos/regs-pmu.h
@@ -105,6 +105,12 @@
#define S5P_GPS_LOWPWR S5P_PMUREG(0x139C)
#define S5P_GPS_ALIVE_LOWPWR S5P_PMUREG(0x13A0)
+#define EXYNOS_ARM_CORE0_CONFIGURATION S5P_PMUREG(0x2000)
+#define EXYNOS_ARM_CORE_CONFIGURATION(_nr) \
+ (EXYNOS_ARM_CORE0_CONFIGURATION + (0x80 * (_nr)))
+#define EXYNOS_ARM_CORE_STATUS(_nr) \
+ (EXYNOS_ARM_CORE_CONFIGURATION(_nr) + 0x4)
+
#define S5P_ARM_CORE1_CONFIGURATION S5P_PMUREG(0x2080)
#define S5P_ARM_CORE1_STATUS S5P_PMUREG(0x2084)