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 static void shmobile_enter_wfi(void)
  20 {
  21         cpu_do_idle();
  22 }
  23
  24 void (*shmobile_cpuidle_modes[CPUIDLE_STATE_MAX])(void) = {
  25         shmobile_enter_wfi, /* regular sleep mode */
  26 };
  27
  28 static int shmobile_cpuidle_enter(struct cpuidle_device *dev,
  29                                   struct cpuidle_driver *drv,
  30                                   int index)
  31 {
  32         shmobile_cpuidle_modes[index]();
  33
  34         return index;
  35 }
  36
  37 static struct cpuidle_device shmobile_cpuidle_dev;
  38 static struct cpuidle_driver shmobile_cpuidle_driver = {
  39         .name                   = "shmobile_cpuidle",
  40         .owner                  = THIS_MODULE,
  41         .en_core_tk_irqen       = 1,
  42         .states[0]              = ARM_CPUIDLE_WFI_STATE,
  43         .safe_state_index       = 0, /* C1 */
  44         .state_count            = 1,
  45 };
  46
  47 void (*shmobile_cpuidle_setup)(struct cpuidle_driver *drv);
  48
  49 int shmobile_cpuidle_init(void)
  50 {
  51         struct cpuidle_device *dev = &shmobile_cpuidle_dev;
  52         struct cpuidle_driver *drv = &shmobile_cpuidle_driver;
  53         int i;
  54
  55         for (i = 0; i < CPUIDLE_STATE_MAX; i++)
  56                 drv->states[i].enter = shmobile_cpuidle_enter;
  57
  58         if (shmobile_cpuidle_setup)
  59                 shmobile_cpuidle_setup(drv);
  60
  61         cpuidle_register_driver(drv);
  62
  63         dev->state_count = drv->state_count;
  64         cpuidle_register_device(dev);
  65
  66         return 0;
  67 }