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Diffstat (limited to '')
| -rw-r--r-- | arch/arm64/kernel/cpuidle.c | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/arch/arm64/kernel/cpuidle.c b/arch/arm64/kernel/cpuidle.c new file mode 100644 index 000000000..f2d13810d --- /dev/null +++ b/arch/arm64/kernel/cpuidle.c @@ -0,0 +1,65 @@ +/* + * ARM64 CPU idle arch support + * + * Copyright (C) 2014 ARM Ltd. + * Author: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/acpi.h> +#include <linux/cpuidle.h> +#include <linux/cpu_pm.h> +#include <linux/of.h> +#include <linux/of_device.h> + +#include <asm/cpuidle.h> +#include <asm/cpu_ops.h> + +int arm_cpuidle_init(unsigned int cpu) +{ + int ret = -EOPNOTSUPP; + + if (cpu_ops[cpu] && cpu_ops[cpu]->cpu_suspend && + cpu_ops[cpu]->cpu_init_idle) + ret = cpu_ops[cpu]->cpu_init_idle(cpu); + + return ret; +} + +/** + * arm_cpuidle_suspend() - function to enter a low-power idle state + * @arg: argument to pass to CPU suspend operations + * + * Return: 0 on success, -EOPNOTSUPP if CPU suspend hook not initialized, CPU + * operations back-end error code otherwise. + */ +int arm_cpuidle_suspend(int index) +{ + int cpu = smp_processor_id(); + + return cpu_ops[cpu]->cpu_suspend(index); +} + +#ifdef CONFIG_ACPI + +#include <acpi/processor.h> + +#define ARM64_LPI_IS_RETENTION_STATE(arch_flags) (!(arch_flags)) + +int acpi_processor_ffh_lpi_probe(unsigned int cpu) +{ + return arm_cpuidle_init(cpu); +} + +int acpi_processor_ffh_lpi_enter(struct acpi_lpi_state *lpi) +{ + if (ARM64_LPI_IS_RETENTION_STATE(lpi->arch_flags)) + return CPU_PM_CPU_IDLE_ENTER_RETENTION(arm_cpuidle_suspend, + lpi->index); + else + return CPU_PM_CPU_IDLE_ENTER(arm_cpuidle_suspend, lpi->index); +} +#endif |