forked from Minki/linux
5a611ed969
This patch adds appropriate callbacks to support ACPI Low Power Idle (LPI) on ARM64. Acked-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
60 lines
1.3 KiB
C
60 lines
1.3 KiB
C
/*
|
|
* 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;
|
|
}
|
|
|
|
/**
|
|
* cpu_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>
|
|
|
|
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)
|
|
{
|
|
return CPU_PM_CPU_IDLE_ENTER(arm_cpuidle_suspend, lpi->index);
|
|
}
|
|
#endif
|