linux-imx

/*

 *  linux/drivers/cpufreq/cpufreq.c

 *

 *  Copyright (C) 2001 Russell King

 *            (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>

 *            (C) 2013 Viresh Kumar <viresh.kumar@linaro.org>

 *

 *  Oct 2005 - Ashok Raj <ashok.raj@intel.com>

 *  Added handling for CPU hotplug

 *  Feb 2006 - Jacob Shin <jacob.shin@amd.com>

 *  Fix handling for CPU hotplug -- affected CPUs

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */

​

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

​

#include <linux/cpu.h>

#include <linux/cpufreq.h>

#include <linux/cpu_cooling.h>

#include <linux/delay.h>

#include <linux/device.h>

#include <linux/init.h>

#include <linux/kernel_stat.h>

#include <linux/module.h>

#include <linux/mutex.h>

#include <linux/slab.h>

#include <linux/suspend.h>

#include <linux/syscore_ops.h>

#include <linux/tick.h>

#include <trace/events/power.h>

​

static LIST_HEAD(cpufreq_policy_list);

​

static inline bool policy_is_inactive(struct cpufreq_policy *policy)

{

    return cpumask_empty(policy->cpus);

}

​

/* Macros to iterate over CPU policies */

#define for_each_suitable_policy(__policy, __active)             \

    list_for_each_entry(__policy, &cpufreq_policy_list, policy_list) \

        if ((__active) == !policy_is_inactive(__policy))

​

#define for_each_active_policy(__policy)        \

    for_each_suitable_policy(__policy, true)

#define for_each_inactive_policy(__policy)      \

    for_each_suitable_policy(__policy, false)

​

#define for_each_policy(__policy)           \

    list_for_each_entry(__policy, &cpufreq_policy_list, policy_list)

​

/* Iterate over governors */

static LIST_HEAD(cpufreq_governor_list);

#define for_each_governor(__governor)               \

    list_for_each_entry(__governor, &cpufreq_governor_list, governor_list)

​

/**

 * The "cpufreq driver" - the arch- or hardware-dependent low

 * level driver of CPUFreq support, and its spinlock. This lock

 * also protects the cpufreq_cpu_data array.