blob: f2d13810daa8fc28449be12138e398a14275fc9a [file] [log] [blame]
* ARM64 CPU idle arch support
* Copyright (C) 2014 ARM Ltd.
* Author: Lorenzo Pieralisi <>
* 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 &&
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);
#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,
return CPU_PM_CPU_IDLE_ENTER(arm_cpuidle_suspend, lpi->index);