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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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