LXR linux/arch/arm/mach-imx/cpuidle-imx7ulp.c

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Copyright (C) 2016 Freescale Semiconductor, Inc.
   4 * Copyright 2017-2018 NXP
   5 *   Anson Huang <Anson.Huang@nxp.com>
   6 */
   7
   8#include <linux/cpuidle.h>
   9#include <linux/module.h>
  10#include <asm/cpuidle.h>
  11
  12#include "common.h"
  13#include "cpuidle.h"
  14
  15static int imx7ulp_enter_wait(struct cpuidle_device *dev,
  16                            struct cpuidle_driver *drv, int index)
  17{
  18        if (index == 1)
  19                imx7ulp_set_lpm(ULP_PM_WAIT);
  20        else
  21                imx7ulp_set_lpm(ULP_PM_STOP);
  22
  23        cpu_do_idle();
  24
  25        imx7ulp_set_lpm(ULP_PM_RUN);
  26
  27        return index;
  28}
  29
  30static struct cpuidle_driver imx7ulp_cpuidle_driver = {
  31        .name = "imx7ulp_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                        .enter = imx7ulp_enter_wait,
  41                        .name = "WAIT",
  42                        .desc = "PSTOP2",
  43                },
  44                /* STOP */
  45                {
  46                        .exit_latency = 100,
  47                        .target_residency = 150,
  48                        .enter = imx7ulp_enter_wait,
  49                        .name = "STOP",
  50                        .desc = "PSTOP1",
  51                },
  52        },
  53        .state_count = 3,
  54        .safe_state_index = 0,
  55};
  56
  57int __init imx7ulp_cpuidle_init(void)
  58{
  59        return cpuidle_register(&imx7ulp_cpuidle_driver, NULL);
  60}
  61