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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> | |
9ce7a258 | 12 | #include <linux/suspend.h> |
9bab0b7f | 13 | #include <linux/syscore_ops.h> |
0a0c5168 RW |
14 | |
15 | #include "internals.h" | |
16 | ||
9ce7a258 TG |
17 | bool irq_pm_check_wakeup(struct irq_desc *desc) |
18 | { | |
19 | if (irqd_is_wakeup_armed(&desc->irq_data)) { | |
20 | irqd_clear(&desc->irq_data, IRQD_WAKEUP_ARMED); | |
21 | desc->istate |= IRQS_SUSPENDED | IRQS_PENDING; | |
22 | desc->depth++; | |
23 | irq_disable(desc); | |
24 | pm_system_wakeup(); | |
25 | return true; | |
26 | } | |
27 | return false; | |
28 | } | |
29 | ||
cab303be TG |
30 | /* |
31 | * Called from __setup_irq() with desc->lock held after @action has | |
32 | * been installed in the action chain. | |
33 | */ | |
34 | void irq_pm_install_action(struct irq_desc *desc, struct irqaction *action) | |
35 | { | |
36 | desc->nr_actions++; | |
37 | ||
38 | if (action->flags & IRQF_FORCE_RESUME) | |
39 | desc->force_resume_depth++; | |
40 | ||
41 | WARN_ON_ONCE(desc->force_resume_depth && | |
42 | desc->force_resume_depth != desc->nr_actions); | |
43 | ||
44 | if (action->flags & IRQF_NO_SUSPEND) | |
45 | desc->no_suspend_depth++; | |
17f48034 RW |
46 | else if (action->flags & IRQF_COND_SUSPEND) |
47 | desc->cond_suspend_depth++; | |
cab303be TG |
48 | |
49 | WARN_ON_ONCE(desc->no_suspend_depth && | |
17f48034 RW |
50 | (desc->no_suspend_depth + |
51 | desc->cond_suspend_depth) != desc->nr_actions); | |
cab303be TG |
52 | } |
53 | ||
54 | /* | |
55 | * Called from __free_irq() with desc->lock held after @action has | |
56 | * been removed from the action chain. | |
57 | */ | |
58 | void irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action) | |
59 | { | |
60 | desc->nr_actions--; | |
61 | ||
62 | if (action->flags & IRQF_FORCE_RESUME) | |
63 | desc->force_resume_depth--; | |
64 | ||
65 | if (action->flags & IRQF_NO_SUSPEND) | |
66 | desc->no_suspend_depth--; | |
17f48034 RW |
67 | else if (action->flags & IRQF_COND_SUSPEND) |
68 | desc->cond_suspend_depth--; | |
cab303be TG |
69 | } |
70 | ||
c4df606c | 71 | static bool suspend_device_irq(struct irq_desc *desc, int irq) |
8df2e02c | 72 | { |
5417de22 | 73 | if (!desc->action || desc->no_suspend_depth) |
c4df606c | 74 | return false; |
8df2e02c | 75 | |
9ce7a258 | 76 | if (irqd_is_wakeup_set(&desc->irq_data)) { |
b76f1674 | 77 | irqd_set(&desc->irq_data, IRQD_WAKEUP_ARMED); |
9ce7a258 TG |
78 | /* |
79 | * We return true here to force the caller to issue | |
80 | * synchronize_irq(). We need to make sure that the | |
81 | * IRQD_WAKEUP_ARMED is visible before we return from | |
82 | * suspend_device_irqs(). | |
83 | */ | |
84 | return true; | |
85 | } | |
b76f1674 | 86 | |
8df2e02c TG |
87 | desc->istate |= IRQS_SUSPENDED; |
88 | __disable_irq(desc, irq); | |
092fadd5 TG |
89 | |
90 | /* | |
91 | * Hardware which has no wakeup source configuration facility | |
92 | * requires that the non wakeup interrupts are masked at the | |
93 | * chip level. The chip implementation indicates that with | |
94 | * IRQCHIP_MASK_ON_SUSPEND. | |
95 | */ | |
96 | if (irq_desc_get_chip(desc)->flags & IRQCHIP_MASK_ON_SUSPEND) | |
97 | mask_irq(desc); | |
c4df606c | 98 | return true; |
8df2e02c TG |
99 | } |
100 | ||
0a0c5168 RW |
101 | /** |
102 | * suspend_device_irqs - disable all currently enabled interrupt lines | |
103 | * | |
8df2e02c TG |
104 | * During system-wide suspend or hibernation device drivers need to be |
105 | * prevented from receiving interrupts and this function is provided | |
106 | * for this purpose. | |
107 | * | |
108 | * So we disable all interrupts and mark them IRQS_SUSPENDED except | |
9ce7a258 | 109 | * for those which are unused, those which are marked as not |
8df2e02c | 110 | * suspendable via an interrupt request with the flag IRQF_NO_SUSPEND |
9ce7a258 TG |
111 | * set and those which are marked as active wakeup sources. |
112 | * | |
113 | * The active wakeup sources are handled by the flow handler entry | |
114 | * code which checks for the IRQD_WAKEUP_ARMED flag, suspends the | |
115 | * interrupt and notifies the pm core about the wakeup. | |
0a0c5168 RW |
116 | */ |
117 | void suspend_device_irqs(void) | |
118 | { | |
119 | struct irq_desc *desc; | |
120 | int irq; | |
121 | ||
122 | for_each_irq_desc(irq, desc) { | |
123 | unsigned long flags; | |
c4df606c | 124 | bool sync; |
0a0c5168 | 125 | |
239007b8 | 126 | raw_spin_lock_irqsave(&desc->lock, flags); |
c4df606c | 127 | sync = suspend_device_irq(desc, irq); |
239007b8 | 128 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
0a0c5168 | 129 | |
c4df606c | 130 | if (sync) |
0a0c5168 | 131 | synchronize_irq(irq); |
c4df606c | 132 | } |
0a0c5168 RW |
133 | } |
134 | EXPORT_SYMBOL_GPL(suspend_device_irqs); | |
135 | ||
8df2e02c TG |
136 | static void resume_irq(struct irq_desc *desc, int irq) |
137 | { | |
b76f1674 TG |
138 | irqd_clear(&desc->irq_data, IRQD_WAKEUP_ARMED); |
139 | ||
8df2e02c TG |
140 | if (desc->istate & IRQS_SUSPENDED) |
141 | goto resume; | |
142 | ||
5417de22 TG |
143 | /* Force resume the interrupt? */ |
144 | if (!desc->force_resume_depth) | |
8df2e02c TG |
145 | return; |
146 | ||
147 | /* Pretend that it got disabled ! */ | |
148 | desc->depth++; | |
149 | resume: | |
150 | desc->istate &= ~IRQS_SUSPENDED; | |
151 | __enable_irq(desc, irq); | |
152 | } | |
153 | ||
9bab0b7f | 154 | static void resume_irqs(bool want_early) |
0a0c5168 RW |
155 | { |
156 | struct irq_desc *desc; | |
157 | int irq; | |
158 | ||
159 | for_each_irq_desc(irq, desc) { | |
160 | unsigned long flags; | |
9bab0b7f IC |
161 | bool is_early = desc->action && |
162 | desc->action->flags & IRQF_EARLY_RESUME; | |
163 | ||
ac01810c | 164 | if (!is_early && want_early) |
9bab0b7f | 165 | continue; |
0a0c5168 | 166 | |
239007b8 | 167 | raw_spin_lock_irqsave(&desc->lock, flags); |
8df2e02c | 168 | resume_irq(desc, irq); |
239007b8 | 169 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
0a0c5168 RW |
170 | } |
171 | } | |
9bab0b7f IC |
172 | |
173 | /** | |
174 | * irq_pm_syscore_ops - enable interrupt lines early | |
175 | * | |
176 | * Enable all interrupt lines with %IRQF_EARLY_RESUME set. | |
177 | */ | |
178 | static void irq_pm_syscore_resume(void) | |
179 | { | |
180 | resume_irqs(true); | |
181 | } | |
182 | ||
183 | static struct syscore_ops irq_pm_syscore_ops = { | |
184 | .resume = irq_pm_syscore_resume, | |
185 | }; | |
186 | ||
187 | static int __init irq_pm_init_ops(void) | |
188 | { | |
189 | register_syscore_ops(&irq_pm_syscore_ops); | |
190 | return 0; | |
191 | } | |
192 | ||
193 | device_initcall(irq_pm_init_ops); | |
194 | ||
195 | /** | |
196 | * resume_device_irqs - enable interrupt lines disabled by suspend_device_irqs() | |
197 | * | |
198 | * Enable all non-%IRQF_EARLY_RESUME interrupt lines previously | |
199 | * disabled by suspend_device_irqs() that have the IRQS_SUSPENDED flag | |
200 | * set as well as those with %IRQF_FORCE_RESUME. | |
201 | */ | |
202 | void resume_device_irqs(void) | |
203 | { | |
204 | resume_irqs(false); | |
205 | } | |
0a0c5168 | 206 | EXPORT_SYMBOL_GPL(resume_device_irqs); |