arch/arm/mach-shmobile/cpuidle.c

   1 /*
   2  * CPUIdle support code for SH-Mobile ARM
   3  *
   4  *  Copyright (C) 2011 Magnus Damm
   5  *
   6  * This file is subject to the terms and conditions of the GNU General Public
   7  * License.  See the file "COPYING" in the main directory of this archive
   8  * for more details.
   9  */
  10
  11 #include <linux/pm.h>
  12 #include <linux/cpuidle.h>
  13 #include <linux/suspend.h>
  14 #include <linux/module.h>
  15 #include <linux/err.h>
  16 #include <asm/cpuidle.h>
  17 #include <asm/io.h>
  18
  19 int shmobile_enter_wfi(struct cpuidle_device *dev, struct cpuidle_driver *drv,
  20                        int index)
  21 {
  22         cpu_do_idle();
  23         return 0;
  24 }
  25
  26 static struct cpuidle_device shmobile_cpuidle_dev;
  27 static struct cpuidle_driver shmobile_cpuidle_default_driver = {
  28         .name                   = "shmobile_cpuidle",
  29         .owner                  = THIS_MODULE,
  30         .en_core_tk_irqen       = 1,
  31         .states[0]              = ARM_CPUIDLE_WFI_STATE,
  32         .states[0].enter        = shmobile_enter_wfi,
  33         .safe_state_index       = 0, /* C1 */
  34         .state_count            = 1,
  35 };
  36
  37 static struct cpuidle_driver *cpuidle_drv = &shmobile_cpuidle_default_driver;
  38
  39 void shmobile_cpuidle_set_driver(struct cpuidle_driver *drv)
  40 {
  41         cpuidle_drv = drv;
  42 }
  43
  44 int shmobile_cpuidle_init(void)
  45 {
  46         struct cpuidle_device *dev = &shmobile_cpuidle_dev;
  47
  48         cpuidle_register_driver(cpuidle_drv);
  49
  50         dev->state_count = cpuidle_drv->state_count;
  51         cpuidle_register_device(dev);
  52
  53         return 0;
  54 }