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ARM: EXYNOS: Add generic cpu power control functions for exynos SoCs

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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>
This commit is contained in:
Leela Krishna Amudala 2014-05-16 04:23:24 +09:00 committed by Kukjin Kim
parent d7067f1c5f
commit d3af6976a2
3 changed files with 45 additions and 0 deletions
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3
arch/arm/mach-exynos/common.h
View file

@ -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 */

36
arch/arm/mach-exynos/pm.c
View file

@ -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];

6
arch/arm/mach-exynos/regs-pmu.h
View file

@ -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)