// SPDX-License-Identifier: GPL-2.0-only

  /*
   * Copyright 2012 Calxeda, Inc.
   *

   * Based on arch/arm/plat-mxc/cpuidle.c: #v3.7

   * Copyright 2012 Freescale Semiconductor, Inc.
   * Copyright 2012 Linaro Ltd.
   *

   * Maintainer: Rob Herring <rob.herring@calxeda.com>

   */
  
  #include <linux/cpuidle.h>

  #include <linux/cpu_pm.h>

  #include <linux/init.h>

  #include <linux/mm.h>

  #include <linux/platform_device.h>

  #include <linux/psci.h>

  #include <asm/cpuidle.h>

  #include <asm/suspend.h>

  
  #include <uapi/linux/psci.h>
  
  #define CALXEDA_IDLE_PARAM \
  	((0 << PSCI_0_2_POWER_STATE_ID_SHIFT) | \
  	 (0 << PSCI_0_2_POWER_STATE_AFFL_SHIFT) | \
  	 (PSCI_POWER_STATE_TYPE_POWER_DOWN << PSCI_0_2_POWER_STATE_TYPE_SHIFT))

  
  static int calxeda_idle_finish(unsigned long val)
  {

  	return psci_ops.cpu_suspend(CALXEDA_IDLE_PARAM, __pa(cpu_resume));

  }
  
  static int calxeda_pwrdown_idle(struct cpuidle_device *dev,
  				struct cpuidle_driver *drv,
  				int index)
  {

  	cpu_pm_enter();

  	cpu_suspend(0, calxeda_idle_finish);

  	cpu_pm_exit();

  	return index;
  }

  static struct cpuidle_driver calxeda_idle_driver = {
  	.name = "calxeda_idle",

  	.states = {
  		ARM_CPUIDLE_WFI_STATE,
  		{
  			.name = "PG",
  			.desc = "Power Gate",

  			.exit_latency = 30,
  			.power_usage = 50,
  			.target_residency = 200,
  			.enter = calxeda_pwrdown_idle,
  		},
  	},
  	.state_count = 2,
  };

  static int calxeda_cpuidle_probe(struct platform_device *pdev)

  {

  	return cpuidle_register(&calxeda_idle_driver, NULL);

  }

  
  static struct platform_driver calxeda_cpuidle_plat_driver = {
          .driver = {
                  .name = "cpuidle-calxeda",

          },
          .probe = calxeda_cpuidle_probe,
  };

  builtin_platform_driver(calxeda_cpuidle_plat_driver);