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Linux/arch/arm/include/asm/cpuidle.h

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

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