1 // SPDX-License-Identifier: GPL-2.0 1 // SPDX-License-Identifier: GPL-2.0
2 /* 2 /*
3 * Copyright (C) 2009 Rafael J. Wysocki <rjw@s 3 * Copyright (C) 2009 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
4 * 4 *
5 * This file contains power management functio 5 * This file contains power management functions related to interrupts.
6 */ 6 */
7 7
8 #include <linux/irq.h> 8 #include <linux/irq.h>
9 #include <linux/module.h> 9 #include <linux/module.h>
10 #include <linux/interrupt.h> 10 #include <linux/interrupt.h>
11 #include <linux/suspend.h> 11 #include <linux/suspend.h>
12 #include <linux/syscore_ops.h> 12 #include <linux/syscore_ops.h>
13 13
14 #include "internals.h" 14 #include "internals.h"
15 15
16 bool irq_pm_check_wakeup(struct irq_desc *desc 16 bool irq_pm_check_wakeup(struct irq_desc *desc)
17 { 17 {
18 if (irqd_is_wakeup_armed(&desc->irq_da 18 if (irqd_is_wakeup_armed(&desc->irq_data)) {
19 irqd_clear(&desc->irq_data, IR 19 irqd_clear(&desc->irq_data, IRQD_WAKEUP_ARMED);
20 desc->istate |= IRQS_SUSPENDED 20 desc->istate |= IRQS_SUSPENDED | IRQS_PENDING;
21 desc->depth++; 21 desc->depth++;
22 irq_disable(desc); 22 irq_disable(desc);
23 pm_system_irq_wakeup(irq_desc_ 23 pm_system_irq_wakeup(irq_desc_get_irq(desc));
24 return true; 24 return true;
25 } 25 }
26 return false; 26 return false;
27 } 27 }
28 28
29 /* 29 /*
30 * Called from __setup_irq() with desc->lock h 30 * Called from __setup_irq() with desc->lock held after @action has
31 * been installed in the action chain. 31 * been installed in the action chain.
32 */ 32 */
33 void irq_pm_install_action(struct irq_desc *de 33 void irq_pm_install_action(struct irq_desc *desc, struct irqaction *action)
34 { 34 {
35 desc->nr_actions++; 35 desc->nr_actions++;
36 36
37 if (action->flags & IRQF_FORCE_RESUME) 37 if (action->flags & IRQF_FORCE_RESUME)
38 desc->force_resume_depth++; 38 desc->force_resume_depth++;
39 39
40 WARN_ON_ONCE(desc->force_resume_depth 40 WARN_ON_ONCE(desc->force_resume_depth &&
41 desc->force_resume_depth 41 desc->force_resume_depth != desc->nr_actions);
42 42
43 if (action->flags & IRQF_NO_SUSPEND) 43 if (action->flags & IRQF_NO_SUSPEND)
44 desc->no_suspend_depth++; 44 desc->no_suspend_depth++;
45 else if (action->flags & IRQF_COND_SUS 45 else if (action->flags & IRQF_COND_SUSPEND)
46 desc->cond_suspend_depth++; 46 desc->cond_suspend_depth++;
47 47
48 WARN_ON_ONCE(desc->no_suspend_depth && 48 WARN_ON_ONCE(desc->no_suspend_depth &&
49 (desc->no_suspend_depth + 49 (desc->no_suspend_depth +
50 desc->cond_suspend_dep 50 desc->cond_suspend_depth) != desc->nr_actions);
51 } 51 }
52 52
53 /* 53 /*
54 * Called from __free_irq() with desc->lock he 54 * Called from __free_irq() with desc->lock held after @action has
55 * been removed from the action chain. 55 * been removed from the action chain.
56 */ 56 */
57 void irq_pm_remove_action(struct irq_desc *des 57 void irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action)
58 { 58 {
59 desc->nr_actions--; 59 desc->nr_actions--;
60 60
61 if (action->flags & IRQF_FORCE_RESUME) 61 if (action->flags & IRQF_FORCE_RESUME)
62 desc->force_resume_depth--; 62 desc->force_resume_depth--;
63 63
64 if (action->flags & IRQF_NO_SUSPEND) 64 if (action->flags & IRQF_NO_SUSPEND)
65 desc->no_suspend_depth--; 65 desc->no_suspend_depth--;
66 else if (action->flags & IRQF_COND_SUS 66 else if (action->flags & IRQF_COND_SUSPEND)
67 desc->cond_suspend_depth--; 67 desc->cond_suspend_depth--;
68 } 68 }
69 69
70 static bool suspend_device_irq(struct irq_desc 70 static bool suspend_device_irq(struct irq_desc *desc)
71 { 71 {
72 unsigned long chipflags = irq_desc_get 72 unsigned long chipflags = irq_desc_get_chip(desc)->flags;
73 struct irq_data *irqd = &desc->irq_dat 73 struct irq_data *irqd = &desc->irq_data;
74 74
75 if (!desc->action || irq_desc_is_chain 75 if (!desc->action || irq_desc_is_chained(desc) ||
76 desc->no_suspend_depth) 76 desc->no_suspend_depth)
77 return false; 77 return false;
78 78
79 if (irqd_is_wakeup_set(irqd)) { 79 if (irqd_is_wakeup_set(irqd)) {
80 irqd_set(irqd, IRQD_WAKEUP_ARM 80 irqd_set(irqd, IRQD_WAKEUP_ARMED);
81 81
82 if ((chipflags & IRQCHIP_ENABL 82 if ((chipflags & IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND) &&
83 irqd_irq_disabled(irqd)) 83 irqd_irq_disabled(irqd)) {
84 /* 84 /*
85 * Interrupt marked fo 85 * Interrupt marked for wakeup is in disabled state.
86 * Enable interrupt he 86 * Enable interrupt here to unmask/enable in irqchip
87 * to be able to resum 87 * to be able to resume with such interrupts.
88 */ 88 */
89 __enable_irq(desc); 89 __enable_irq(desc);
90 irqd_set(irqd, IRQD_IR 90 irqd_set(irqd, IRQD_IRQ_ENABLED_ON_SUSPEND);
91 } 91 }
92 /* 92 /*
93 * We return true here to forc 93 * We return true here to force the caller to issue
94 * synchronize_irq(). We need 94 * synchronize_irq(). We need to make sure that the
95 * IRQD_WAKEUP_ARMED is visibl 95 * IRQD_WAKEUP_ARMED is visible before we return from
96 * suspend_device_irqs(). 96 * suspend_device_irqs().
97 */ 97 */
98 return true; 98 return true;
99 } 99 }
100 100
101 desc->istate |= IRQS_SUSPENDED; 101 desc->istate |= IRQS_SUSPENDED;
102 __disable_irq(desc); 102 __disable_irq(desc);
103 103
104 /* 104 /*
105 * Hardware which has no wakeup source 105 * Hardware which has no wakeup source configuration facility
106 * requires that the non wakeup interr 106 * requires that the non wakeup interrupts are masked at the
107 * chip level. The chip implementation 107 * chip level. The chip implementation indicates that with
108 * IRQCHIP_MASK_ON_SUSPEND. 108 * IRQCHIP_MASK_ON_SUSPEND.
109 */ 109 */
110 if (chipflags & IRQCHIP_MASK_ON_SUSPEN 110 if (chipflags & IRQCHIP_MASK_ON_SUSPEND)
111 mask_irq(desc); 111 mask_irq(desc);
112 return true; 112 return true;
113 } 113 }
114 114
115 /** 115 /**
116 * suspend_device_irqs - disable all currently 116 * suspend_device_irqs - disable all currently enabled interrupt lines
117 * 117 *
118 * During system-wide suspend or hibernation d 118 * During system-wide suspend or hibernation device drivers need to be
119 * prevented from receiving interrupts and thi 119 * prevented from receiving interrupts and this function is provided
120 * for this purpose. 120 * for this purpose.
121 * 121 *
122 * So we disable all interrupts and mark them 122 * So we disable all interrupts and mark them IRQS_SUSPENDED except
123 * for those which are unused, those which are 123 * for those which are unused, those which are marked as not
124 * suspendable via an interrupt request with t 124 * suspendable via an interrupt request with the flag IRQF_NO_SUSPEND
125 * set and those which are marked as active wa 125 * set and those which are marked as active wakeup sources.
126 * 126 *
127 * The active wakeup sources are handled by th 127 * The active wakeup sources are handled by the flow handler entry
128 * code which checks for the IRQD_WAKEUP_ARMED 128 * code which checks for the IRQD_WAKEUP_ARMED flag, suspends the
129 * interrupt and notifies the pm core about th 129 * interrupt and notifies the pm core about the wakeup.
130 */ 130 */
131 void suspend_device_irqs(void) 131 void suspend_device_irqs(void)
132 { 132 {
133 struct irq_desc *desc; 133 struct irq_desc *desc;
134 int irq; 134 int irq;
135 135
136 for_each_irq_desc(irq, desc) { 136 for_each_irq_desc(irq, desc) {
137 unsigned long flags; 137 unsigned long flags;
138 bool sync; 138 bool sync;
139 139
140 if (irq_settings_is_nested_thr 140 if (irq_settings_is_nested_thread(desc))
141 continue; 141 continue;
142 raw_spin_lock_irqsave(&desc->l 142 raw_spin_lock_irqsave(&desc->lock, flags);
143 sync = suspend_device_irq(desc 143 sync = suspend_device_irq(desc);
144 raw_spin_unlock_irqrestore(&de 144 raw_spin_unlock_irqrestore(&desc->lock, flags);
145 145
146 if (sync) 146 if (sync)
147 synchronize_irq(irq); 147 synchronize_irq(irq);
148 } 148 }
149 } 149 }
150 150
151 static void resume_irq(struct irq_desc *desc) 151 static void resume_irq(struct irq_desc *desc)
152 { 152 {
153 struct irq_data *irqd = &desc->irq_dat 153 struct irq_data *irqd = &desc->irq_data;
154 154
155 irqd_clear(irqd, IRQD_WAKEUP_ARMED); 155 irqd_clear(irqd, IRQD_WAKEUP_ARMED);
156 156
157 if (irqd_is_enabled_on_suspend(irqd)) 157 if (irqd_is_enabled_on_suspend(irqd)) {
158 /* 158 /*
159 * Interrupt marked for wakeup 159 * Interrupt marked for wakeup was enabled during suspend
160 * entry. Disable such interru 160 * entry. Disable such interrupts to restore them back to
161 * original state. 161 * original state.
162 */ 162 */
163 __disable_irq(desc); 163 __disable_irq(desc);
164 irqd_clear(irqd, IRQD_IRQ_ENAB 164 irqd_clear(irqd, IRQD_IRQ_ENABLED_ON_SUSPEND);
165 } 165 }
166 166
167 if (desc->istate & IRQS_SUSPENDED) 167 if (desc->istate & IRQS_SUSPENDED)
168 goto resume; 168 goto resume;
169 169
170 /* Force resume the interrupt? */ 170 /* Force resume the interrupt? */
171 if (!desc->force_resume_depth) 171 if (!desc->force_resume_depth)
172 return; 172 return;
173 173
174 /* Pretend that it got disabled ! */ 174 /* Pretend that it got disabled ! */
175 desc->depth++; 175 desc->depth++;
176 irq_state_set_disabled(desc); 176 irq_state_set_disabled(desc);
177 irq_state_set_masked(desc); 177 irq_state_set_masked(desc);
178 resume: 178 resume:
179 desc->istate &= ~IRQS_SUSPENDED; 179 desc->istate &= ~IRQS_SUSPENDED;
180 __enable_irq(desc); 180 __enable_irq(desc);
181 } 181 }
182 182
183 static void resume_irqs(bool want_early) 183 static void resume_irqs(bool want_early)
184 { 184 {
185 struct irq_desc *desc; 185 struct irq_desc *desc;
186 int irq; 186 int irq;
187 187
188 for_each_irq_desc(irq, desc) { 188 for_each_irq_desc(irq, desc) {
189 unsigned long flags; 189 unsigned long flags;
190 bool is_early = desc->action & 190 bool is_early = desc->action &&
191 desc->action->flags & 191 desc->action->flags & IRQF_EARLY_RESUME;
192 192
193 if (!is_early && want_early) 193 if (!is_early && want_early)
194 continue; 194 continue;
195 if (irq_settings_is_nested_thr 195 if (irq_settings_is_nested_thread(desc))
196 continue; 196 continue;
197 197
198 raw_spin_lock_irqsave(&desc->l 198 raw_spin_lock_irqsave(&desc->lock, flags);
199 resume_irq(desc); 199 resume_irq(desc);
200 raw_spin_unlock_irqrestore(&de 200 raw_spin_unlock_irqrestore(&desc->lock, flags);
201 } 201 }
202 } 202 }
203 203
204 /** 204 /**
205 * rearm_wake_irq - rearm a wakeup interrupt l 205 * rearm_wake_irq - rearm a wakeup interrupt line after signaling wakeup
206 * @irq: Interrupt to rearm 206 * @irq: Interrupt to rearm
207 */ 207 */
208 void rearm_wake_irq(unsigned int irq) 208 void rearm_wake_irq(unsigned int irq)
209 { 209 {
210 unsigned long flags; 210 unsigned long flags;
211 struct irq_desc *desc = irq_get_desc_b 211 struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
212 212
213 if (!desc) 213 if (!desc)
214 return; 214 return;
215 215
216 if (!(desc->istate & IRQS_SUSPENDED) | 216 if (!(desc->istate & IRQS_SUSPENDED) ||
217 !irqd_is_wakeup_set(&desc->irq_dat 217 !irqd_is_wakeup_set(&desc->irq_data))
218 goto unlock; 218 goto unlock;
219 219
220 desc->istate &= ~IRQS_SUSPENDED; 220 desc->istate &= ~IRQS_SUSPENDED;
221 irqd_set(&desc->irq_data, IRQD_WAKEUP_ 221 irqd_set(&desc->irq_data, IRQD_WAKEUP_ARMED);
222 __enable_irq(desc); 222 __enable_irq(desc);
223 223
224 unlock: 224 unlock:
225 irq_put_desc_busunlock(desc, flags); 225 irq_put_desc_busunlock(desc, flags);
226 } 226 }
227 227
228 /** 228 /**
229 * irq_pm_syscore_resume - enable interrupt li 229 * irq_pm_syscore_resume - enable interrupt lines early
230 * 230 *
231 * Enable all interrupt lines with %IRQF_EARLY 231 * Enable all interrupt lines with %IRQF_EARLY_RESUME set.
232 */ 232 */
233 static void irq_pm_syscore_resume(void) 233 static void irq_pm_syscore_resume(void)
234 { 234 {
235 resume_irqs(true); 235 resume_irqs(true);
236 } 236 }
237 237
238 static struct syscore_ops irq_pm_syscore_ops = 238 static struct syscore_ops irq_pm_syscore_ops = {
239 .resume = irq_pm_syscore_resum 239 .resume = irq_pm_syscore_resume,
240 }; 240 };
241 241
242 static int __init irq_pm_init_ops(void) 242 static int __init irq_pm_init_ops(void)
243 { 243 {
244 register_syscore_ops(&irq_pm_syscore_o 244 register_syscore_ops(&irq_pm_syscore_ops);
245 return 0; 245 return 0;
246 } 246 }
247 247
248 device_initcall(irq_pm_init_ops); 248 device_initcall(irq_pm_init_ops);
249 249
250 /** 250 /**
251 * resume_device_irqs - enable interrupt lines 251 * resume_device_irqs - enable interrupt lines disabled by suspend_device_irqs()
252 * 252 *
253 * Enable all non-%IRQF_EARLY_RESUME interrupt 253 * Enable all non-%IRQF_EARLY_RESUME interrupt lines previously
254 * disabled by suspend_device_irqs() that have 254 * disabled by suspend_device_irqs() that have the IRQS_SUSPENDED flag
255 * set as well as those with %IRQF_FORCE_RESUM 255 * set as well as those with %IRQF_FORCE_RESUME.
256 */ 256 */
257 void resume_device_irqs(void) 257 void resume_device_irqs(void)
258 { 258 {
259 resume_irqs(false); 259 resume_irqs(false);
260 } 260 }
261 261
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