arch/arm/include/asm/cpuidle.h

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