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

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Copyright (C) 2014 Freescale Semiconductor, Inc.
   4 */
   5
   6#include <linux/clk/imx.h>
   7#include <linux/cpuidle.h>
   8#include <linux/module.h>
   9#include <asm/cpuidle.h>
  10
  11#include "common.h"
  12#include "cpuidle.h"
  13
  14static int imx6sl_enter_wait(struct cpuidle_device *dev,
  15                            struct cpuidle_driver *drv, int index)
  16{
  17        imx6_set_lpm(WAIT_UNCLOCKED);
  18        /*
  19         * Software workaround for ERR005311, see function
  20         * description for details.
  21         */
  22        imx6sl_set_wait_clk(true);
  23        cpu_do_idle();
  24        imx6sl_set_wait_clk(false);
  25        imx6_set_lpm(WAIT_CLOCKED);
  26
  27        return index;
  28}
  29
  30static struct cpuidle_driver imx6sl_cpuidle_driver = {
  31        .name = "imx6sl_cpuidle",
  32        .owner = THIS_MODULE,
  33        .states = {
  34                /* WFI */
  35                ARM_CPUIDLE_WFI_STATE,
  36                /* WAIT */
  37                {
  38                        .exit_latency = 50,
  39                        .target_residency = 75,
  40                        .flags = CPUIDLE_FLAG_TIMER_STOP,
  41                        .enter = imx6sl_enter_wait,
  42                        .name = "WAIT",
  43                        .desc = "Clock off",
  44                },
  45        },
  46        .state_count = 2,
  47        .safe_state_index = 0,
  48};
  49
  50int __init imx6sl_cpuidle_init(void)
  51{
  52        return cpuidle_register(&imx6sl_cpuidle_driver, NULL);
  53}
  54