linux-imx

/*

 * intel_pstate.c: Native P state management for Intel processors

 *

 * (C) Copyright 2012 Intel Corporation

 * Author: Dirk Brandewie <dirk.j.brandewie@intel.com>

 *

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

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; version 2

 * of the License.

 */

​

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

​

#include <linux/kernel.h>

#include <linux/kernel_stat.h>

#include <linux/module.h>

#include <linux/ktime.h>

#include <linux/hrtimer.h>

#include <linux/tick.h>

#include <linux/slab.h>

#include <linux/sched/cpufreq.h>

#include <linux/list.h>

#include <linux/cpu.h>

#include <linux/cpufreq.h>

#include <linux/sysfs.h>

#include <linux/types.h>

#include <linux/fs.h>

#include <linux/acpi.h>

#include <linux/vmalloc.h>

#include <trace/events/power.h>

​

#include <asm/div64.h>

#include <asm/msr.h>

#include <asm/cpu_device_id.h>

#include <asm/cpufeature.h>

#include <asm/intel-family.h>

​

#define INTEL_PSTATE_SAMPLING_INTERVAL  (10 * NSEC_PER_MSEC)

​

#define INTEL_CPUFREQ_TRANSITION_LATENCY    20000

#define INTEL_CPUFREQ_TRANSITION_DELAY      500

​

#ifdef CONFIG_ACPI

#include <acpi/processor.h>

#include <acpi/cppc_acpi.h>

#endif

​

#define FRAC_BITS 8

#define int_tofp(X) ((int64_t)(X) << FRAC_BITS)

#define fp_toint(X) ((X) >> FRAC_BITS)

​

#define ONE_EIGHTH_FP ((int64_t)1 << (FRAC_BITS - 3))

​

#define EXT_BITS 6

#define EXT_FRAC_BITS (EXT_BITS + FRAC_BITS)

#define fp_ext_toint(X) ((X) >> EXT_FRAC_BITS)

#define int_ext_tofp(X) ((int64_t)(X) << EXT_FRAC_BITS)

​

static inline int32_t mul_fp(int32_t x, int32_t y)

{

    return ((int64_t)x * (int64_t)y) >> FRAC_BITS;

}