LXR linux/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
  16static 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
  32static 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
  52int __init imx6sl_cpuidle_init(void)
  53{
  54        return cpuidle_register(&imx6sl_cpuidle_driver, NULL);
  55}
  56