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0a0c5168 RW |
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 | ||
13 | #include "internals.h" | |
14 | ||
15 | /** | |
16 | * suspend_device_irqs - disable all currently enabled interrupt lines | |
17 | * | |
c71320d0 RW |
18 | * During system-wide suspend or hibernation device drivers need to be prevented |
19 | * from receiving interrupts and this function is provided for this purpose. | |
20 | * It marks all interrupt lines in use, except for the timer ones, as disabled | |
c531e836 | 21 | * and sets the IRQS_SUSPENDED flag for each of them. |
0a0c5168 RW |
22 | */ |
23 | void suspend_device_irqs(void) | |
24 | { | |
25 | struct irq_desc *desc; | |
26 | int irq; | |
27 | ||
28 | for_each_irq_desc(irq, desc) { | |
29 | unsigned long flags; | |
30 | ||
239007b8 | 31 | raw_spin_lock_irqsave(&desc->lock, flags); |
0a0c5168 | 32 | __disable_irq(desc, irq, true); |
239007b8 | 33 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
0a0c5168 RW |
34 | } |
35 | ||
36 | for_each_irq_desc(irq, desc) | |
c531e836 | 37 | if (desc->istate & IRQS_SUSPENDED) |
0a0c5168 RW |
38 | synchronize_irq(irq); |
39 | } | |
40 | EXPORT_SYMBOL_GPL(suspend_device_irqs); | |
41 | ||
42 | /** | |
43 | * resume_device_irqs - enable interrupt lines disabled by suspend_device_irqs() | |
44 | * | |
45 | * Enable all interrupt lines previously disabled by suspend_device_irqs() that | |
c531e836 | 46 | * have the IRQS_SUSPENDED flag set. |
0a0c5168 RW |
47 | */ |
48 | void resume_device_irqs(void) | |
49 | { | |
50 | struct irq_desc *desc; | |
51 | int irq; | |
52 | ||
53 | for_each_irq_desc(irq, desc) { | |
54 | unsigned long flags; | |
55 | ||
239007b8 | 56 | raw_spin_lock_irqsave(&desc->lock, flags); |
0a0c5168 | 57 | __enable_irq(desc, irq, true); |
239007b8 | 58 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
0a0c5168 RW |
59 | } |
60 | } | |
61 | EXPORT_SYMBOL_GPL(resume_device_irqs); | |
62 | ||
63 | /** | |
64 | * check_wakeup_irqs - check if any wake-up interrupts are pending | |
65 | */ | |
66 | int check_wakeup_irqs(void) | |
67 | { | |
68 | struct irq_desc *desc; | |
69 | int irq; | |
70 | ||
d209a699 TG |
71 | for_each_irq_desc(irq, desc) { |
72 | if (irqd_is_wakeup_set(&desc->irq_data)) { | |
73 | if (desc->istate & IRQS_PENDING) | |
74 | return -EBUSY; | |
75 | continue; | |
76 | } | |
77 | /* | |
78 | * Check the non wakeup interrupts whether they need | |
79 | * to be masked before finally going into suspend | |
80 | * state. That's for hardware which has no wakeup | |
81 | * source configuration facility. The chip | |
82 | * implementation indicates that with | |
83 | * IRQCHIP_MASK_ON_SUSPEND. | |
84 | */ | |
85 | if (desc->istate & IRQS_SUSPENDED && | |
86 | irq_desc_get_chip(desc)->flags & IRQCHIP_MASK_ON_SUSPEND) | |
87 | mask_irq(desc); | |
88 | } | |
0a0c5168 RW |
89 | |
90 | return 0; | |
91 | } |