From: Leela Krishna Amudala <leela.krishna@xxxxxxxxxx> 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@xxxxxxxxxx> --- arch/arm/mach-exynos/common.h | 3 +++ arch/arm/mach-exynos/pm.c | 36 ++++++++++++++++++++++++++++++++++++ arch/arm/mach-exynos/regs-pmu.h | 6 ++++++ 3 files changed, 45 insertions(+) diff --git a/arch/arm/mach-exynos/common.h b/arch/arm/mach-exynos/common.h index 88c619d..dc6b9a6 100644 --- a/arch/arm/mach-exynos/common.h +++ b/arch/arm/mach-exynos/common.h @@ -61,5 +61,8 @@ struct exynos_pmu_conf { }; extern void exynos_sys_powerdown_conf(enum sys_powerdown mode); +extern void exynos_cpu_powerdown(int cpu); +extern void exynos_cpu_powerup(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 15af0ce..6651028 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_cpu_powerdown : power down the specified cpu + * @cpu : the cpu to power down + * + * Power downs the specified cpu. The sequence must be finished by a + * call to cpu_do_idle() + * + */ +void exynos_cpu_powerdown(int cpu) +{ + __raw_writel(0, EXYNOS_ARM_CORE_CONFIGURATION(cpu)); +} + +/** + * exynos_cpu_powerup : power up the specified cpu + * @cpu : the cpu to power up + * + * Power up the specified cpu + */ +void exynos_cpu_powerup(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 4f6a256..0bdfcbc 100644 --- a/arch/arm/mach-exynos/regs-pmu.h +++ b/arch/arm/mach-exynos/regs-pmu.h @@ -121,6 +121,12 @@ #define S5P_CHECK_SLEEP 0x00000BAD +#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) + /* Only for EXYNOS4210 */ #define S5P_CMU_CLKSTOP_LCD1_LOWPWR S5P_PMUREG(0x1154) #define S5P_CMU_RESET_LCD1_LOWPWR S5P_PMUREG(0x1174) -- 1.8.3.2 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html