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 #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