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Linux/kernel/irq/pm.c

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  1 /*
  2  * linux/kernel/irq/pm.c
  3  *
  4  * Copyright (C) 2009 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
  5  *
  6  * This file contains power management functions related to interrupts.
  7  */
  8 
  9 #include <linux/irq.h>
 10 #include <linux/module.h>
 11 #include <linux/interrupt.h>
 12 #include <linux/syscore_ops.h>
 13 
 14 #include "internals.h"
 15 
 16 /**
 17  * suspend_device_irqs - disable all currently enabled interrupt lines
 18  *
 19  * During system-wide suspend or hibernation device drivers need to be prevented
 20  * from receiving interrupts and this function is provided for this purpose.
 21  * It marks all interrupt lines in use, except for the timer ones, as disabled
 22  * and sets the IRQS_SUSPENDED flag for each of them.
 23  */
 24 void suspend_device_irqs(void)
 25 {
 26         struct irq_desc *desc;
 27         int irq;
 28 
 29         for_each_irq_desc(irq, desc) {
 30                 unsigned long flags;
 31 
 32                 raw_spin_lock_irqsave(&desc->lock, flags);
 33                 __disable_irq(desc, irq, true);
 34                 raw_spin_unlock_irqrestore(&desc->lock, flags);
 35         }
 36 
 37         for_each_irq_desc(irq, desc)
 38                 if (desc->istate & IRQS_SUSPENDED)
 39                         synchronize_irq(irq);
 40 }
 41 EXPORT_SYMBOL_GPL(suspend_device_irqs);
 42 
 43 static void resume_irqs(bool want_early)
 44 {
 45         struct irq_desc *desc;
 46         int irq;
 47 
 48         for_each_irq_desc(irq, desc) {
 49                 unsigned long flags;
 50                 bool is_early = desc->action &&
 51                         desc->action->flags & IRQF_EARLY_RESUME;
 52 
 53                 if (!is_early && want_early)
 54                         continue;
 55 
 56                 raw_spin_lock_irqsave(&desc->lock, flags);
 57                 __enable_irq(desc, irq, true);
 58                 raw_spin_unlock_irqrestore(&desc->lock, flags);
 59         }
 60 }
 61 
 62 /**
 63  * irq_pm_syscore_ops - enable interrupt lines early
 64  *
 65  * Enable all interrupt lines with %IRQF_EARLY_RESUME set.
 66  */
 67 static void irq_pm_syscore_resume(void)
 68 {
 69         resume_irqs(true);
 70 }
 71 
 72 static struct syscore_ops irq_pm_syscore_ops = {
 73         .resume         = irq_pm_syscore_resume,
 74 };
 75 
 76 static int __init irq_pm_init_ops(void)
 77 {
 78         register_syscore_ops(&irq_pm_syscore_ops);
 79         return 0;
 80 }
 81 
 82 device_initcall(irq_pm_init_ops);
 83 
 84 /**
 85  * resume_device_irqs - enable interrupt lines disabled by suspend_device_irqs()
 86  *
 87  * Enable all non-%IRQF_EARLY_RESUME interrupt lines previously
 88  * disabled by suspend_device_irqs() that have the IRQS_SUSPENDED flag
 89  * set as well as those with %IRQF_FORCE_RESUME.
 90  */
 91 void resume_device_irqs(void)
 92 {
 93         resume_irqs(false);
 94 }
 95 EXPORT_SYMBOL_GPL(resume_device_irqs);
 96 
 97 /**
 98  * check_wakeup_irqs - check if any wake-up interrupts are pending
 99  */
100 int check_wakeup_irqs(void)
101 {
102         struct irq_desc *desc;
103         int irq;
104 
105         for_each_irq_desc(irq, desc) {
106                 /*
107                  * Only interrupts which are marked as wakeup source
108                  * and have not been disabled before the suspend check
109                  * can abort suspend.
110                  */
111                 if (irqd_is_wakeup_set(&desc->irq_data)) {
112                         if (desc->depth == 1 && desc->istate & IRQS_PENDING)
113                                 return -EBUSY;
114                         continue;
115                 }
116                 /*
117                  * Check the non wakeup interrupts whether they need
118                  * to be masked before finally going into suspend
119                  * state. That's for hardware which has no wakeup
120                  * source configuration facility. The chip
121                  * implementation indicates that with
122                  * IRQCHIP_MASK_ON_SUSPEND.
123                  */
124                 if (desc->istate & IRQS_SUSPENDED &&
125                     irq_desc_get_chip(desc)->flags & IRQCHIP_MASK_ON_SUSPEND)
126                         mask_irq(desc);
127         }
128 
129         return 0;
130 }
131 

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