1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __ASM_ARM_CPUIDLE_H
3 #define __ASM_ARM_CPUIDLE_H
4
5 #include <asm/proc-fns.h>
6
7 #ifdef CONFIG_CPU_IDLE
8 extern int arm_cpuidle_simple_enter(struct cpuidle_device *dev,
9 struct cpuidle_driver *drv, int index);
10 #define __cpuidle_method_section __used __section("__cpuidle_method_of_table")
11 #else
arm_cpuidle_simple_enter(struct cpuidle_device * dev,struct cpuidle_driver * drv,int index)12 static inline int arm_cpuidle_simple_enter(struct cpuidle_device *dev,
13 struct cpuidle_driver *drv, int index) { return -ENODEV; }
14 #define __cpuidle_method_section __maybe_unused /* drop silently */
15 #endif
16
17 /* Common ARM WFI state */
18 #define ARM_CPUIDLE_WFI_STATE_PWR(p) {\
19 .enter = arm_cpuidle_simple_enter,\
20 .exit_latency = 1,\
21 .target_residency = 1,\
22 .power_usage = p,\
23 .name = "WFI",\
24 .desc = "ARM WFI",\
25 }
26
27 /*
28 * in case power_specified == 1, give a default WFI power value needed
29 * by some governors
30 */
31 #define ARM_CPUIDLE_WFI_STATE ARM_CPUIDLE_WFI_STATE_PWR(UINT_MAX)
32
33 struct device_node;
34
35 struct cpuidle_ops {
36 int (*suspend)(unsigned long arg);
37 int (*init)(struct device_node *, int cpu);
38 };
39
40 struct of_cpuidle_method {
41 const char *method;
42 const struct cpuidle_ops *ops;
43 };
44
45 #define CPUIDLE_METHOD_OF_DECLARE(name, _method, _ops) \
46 static const struct of_cpuidle_method __cpuidle_method_of_table_##name \
47 __cpuidle_method_section = { .method = _method, .ops = _ops }
48
49 extern int arm_cpuidle_suspend(int index);
50
51 extern int arm_cpuidle_init(int cpu);
52
53 struct arm_cpuidle_irq_context { };
54
55 #define arm_cpuidle_save_irq_context(c) (void)c
56 #define arm_cpuidle_restore_irq_context(c) (void)c
57
58 #endif
59