arch/arm/mach-imx/cpuidle-imx6sl.c

   1 /*
   2  * Copyright (C) 2014 Freescale Semiconductor, Inc.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8
   9 #include <linux/cpuidle.h>
  10 #include <linux/module.h>
  11 #include <asm/cpuidle.h>
  12
  13 #include "common.h"
  14 #include "cpuidle.h"
  15
  16 static int imx6sl_enter_wait(struct cpuidle_device *dev,
  17                             struct cpuidle_driver *drv, int index)
  18 {
  19         imx6_set_lpm(WAIT_UNCLOCKED);
  20         /*
  21          * Software workaround for ERR005311, see function
  22          * description for details.
  23          */
  24         imx6sl_set_wait_clk(true);
  25         cpu_do_idle();
  26         imx6sl_set_wait_clk(false);
  27         imx6_set_lpm(WAIT_CLOCKED);
  28
  29         return index;
  30 }
  31
  32 static struct cpuidle_driver imx6sl_cpuidle_driver = {
  33         .name = "imx6sl_cpuidle",
  34         .owner = THIS_MODULE,
  35         .states = {
  36                 /* WFI */
  37                 ARM_CPUIDLE_WFI_STATE,
  38                 /* WAIT */
  39                 {
  40                         .exit_latency = 50,
  41                         .target_residency = 75,
  42                         .flags = CPUIDLE_FLAG_TIMER_STOP,
  43                         .enter = imx6sl_enter_wait,
  44                         .name = "WAIT",
  45                         .desc = "Clock off",
  46                 },
  47         },
  48         .state_count = 2,
  49         .safe_state_index = 0,
  50 };
  51
  52 int __init imx6sl_cpuidle_init(void)
  53 {
  54         return cpuidle_register(&imx6sl_cpuidle_driver, NULL);
  55 }