arch/arm64/kernel/cpuidle.c

   1 /*
   2  * ARM64 CPU idle arch support
   3  *
   4  * Copyright (C) 2014 ARM Ltd.
   5  * Author: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/of.h>
  13 #include <linux/of_device.h>
  14
  15 #include <asm/cpuidle.h>
  16 #include <asm/cpu_ops.h>
  17
  18 int cpu_init_idle(unsigned int cpu)
  19 {
  20         int ret = -EOPNOTSUPP;
  21         struct device_node *cpu_node = of_cpu_device_node_get(cpu);
  22
  23         if (!cpu_node)
  24                 return -ENODEV;
  25
  26         if (cpu_ops[cpu] && cpu_ops[cpu]->cpu_init_idle)
  27                 ret = cpu_ops[cpu]->cpu_init_idle(cpu_node, cpu);
  28
  29         of_node_put(cpu_node);
  30         return ret;
  31 }