126 lines
2.9 KiB
C
126 lines
2.9 KiB
C
/*
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* linux/kernel/irq/pm.c
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*
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* Copyright (C) 2009 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
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*
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* This file contains power management functions related to interrupts.
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*/
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#include <linux/irq.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/syscore_ops.h>
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#include "internals.h"
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/**
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* suspend_device_irqs - disable all currently enabled interrupt lines
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*
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* During system-wide suspend or hibernation device drivers need to be prevented
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* from receiving interrupts and this function is provided for this purpose.
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* It marks all interrupt lines in use, except for the timer ones, as disabled
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* and sets the IRQS_SUSPENDED flag for each of them.
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*/
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void suspend_device_irqs(void)
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{
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struct irq_desc *desc;
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int irq;
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for_each_irq_desc(irq, desc) {
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unsigned long flags;
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raw_spin_lock_irqsave(&desc->lock, flags);
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__disable_irq(desc, irq, true);
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raw_spin_unlock_irqrestore(&desc->lock, flags);
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}
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for_each_irq_desc(irq, desc)
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if (desc->istate & IRQS_SUSPENDED)
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synchronize_irq(irq);
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}
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EXPORT_SYMBOL_GPL(suspend_device_irqs);
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static void resume_irqs(bool want_early)
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{
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struct irq_desc *desc;
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int irq;
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for_each_irq_desc(irq, desc) {
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unsigned long flags;
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bool is_early = desc->action &&
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desc->action->flags & IRQF_EARLY_RESUME;
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if (is_early != want_early)
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continue;
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raw_spin_lock_irqsave(&desc->lock, flags);
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__enable_irq(desc, irq, true);
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raw_spin_unlock_irqrestore(&desc->lock, flags);
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}
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}
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/**
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* irq_pm_syscore_ops - enable interrupt lines early
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*
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* Enable all interrupt lines with %IRQF_EARLY_RESUME set.
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*/
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static void irq_pm_syscore_resume(void)
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{
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resume_irqs(true);
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}
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static struct syscore_ops irq_pm_syscore_ops = {
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.resume = irq_pm_syscore_resume,
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};
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static int __init irq_pm_init_ops(void)
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{
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register_syscore_ops(&irq_pm_syscore_ops);
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return 0;
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}
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device_initcall(irq_pm_init_ops);
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/**
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* resume_device_irqs - enable interrupt lines disabled by suspend_device_irqs()
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*
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* Enable all non-%IRQF_EARLY_RESUME interrupt lines previously
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* disabled by suspend_device_irqs() that have the IRQS_SUSPENDED flag
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* set as well as those with %IRQF_FORCE_RESUME.
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*/
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void resume_device_irqs(void)
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{
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resume_irqs(false);
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}
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EXPORT_SYMBOL_GPL(resume_device_irqs);
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/**
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* check_wakeup_irqs - check if any wake-up interrupts are pending
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*/
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int check_wakeup_irqs(void)
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{
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struct irq_desc *desc;
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int irq;
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for_each_irq_desc(irq, desc) {
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if (irqd_is_wakeup_set(&desc->irq_data)) {
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if (desc->istate & IRQS_PENDING)
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return -EBUSY;
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continue;
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}
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/*
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* Check the non wakeup interrupts whether they need
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* to be masked before finally going into suspend
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* state. That's for hardware which has no wakeup
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* source configuration facility. The chip
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* implementation indicates that with
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* IRQCHIP_MASK_ON_SUSPEND.
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*/
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if (desc->istate & IRQS_SUSPENDED &&
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irq_desc_get_chip(desc)->flags & IRQCHIP_MASK_ON_SUSPEND)
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mask_irq(desc);
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}
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return 0;
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}
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