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 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