52 строки
1.2 KiB
C
52 строки
1.2 KiB
C
/*
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* ARM64 CPU idle arch support
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*
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* Copyright (C) 2014 ARM Ltd.
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* Author: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <asm/cpuidle.h>
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#include <asm/cpu_ops.h>
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int cpu_init_idle(unsigned int cpu)
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{
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int ret = -EOPNOTSUPP;
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struct device_node *cpu_node = of_cpu_device_node_get(cpu);
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if (!cpu_node)
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return -ENODEV;
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if (cpu_ops[cpu] && cpu_ops[cpu]->cpu_init_idle)
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ret = cpu_ops[cpu]->cpu_init_idle(cpu_node, cpu);
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of_node_put(cpu_node);
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return ret;
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}
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/**
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* cpu_suspend() - function to enter a low-power idle state
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* @arg: argument to pass to CPU suspend operations
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*
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* Return: 0 on success, -EOPNOTSUPP if CPU suspend hook not initialized, CPU
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* operations back-end error code otherwise.
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*/
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int cpu_suspend(unsigned long arg)
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{
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int cpu = smp_processor_id();
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/*
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* If cpu_ops have not been registered or suspend
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* has not been initialized, cpu_suspend call fails early.
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*/
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if (!cpu_ops[cpu] || !cpu_ops[cpu]->cpu_suspend)
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return -EOPNOTSUPP;
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return cpu_ops[cpu]->cpu_suspend(arg);
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}
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