linux-imx

/*

 * S3C2416/2450 CPUfreq Support

 *

 * Copyright 2011 Heiko Stuebner <heiko@sntech.de>

 *

 * based on s3c64xx_cpufreq.c

 *

 * Copyright 2009 Wolfson Microelectronics plc

 *

 * 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.

 */

​

#include <linux/kernel.h>

#include <linux/types.h>

#include <linux/init.h>

#include <linux/cpufreq.h>

#include <linux/clk.h>

#include <linux/err.h>

#include <linux/regulator/consumer.h>

#include <linux/reboot.h>

#include <linux/module.h>

​

static DEFINE_MUTEX(cpufreq_lock);

​

struct s3c2416_data {

    struct clk *armdiv;

    struct clk *armclk;

    struct clk *hclk;

​

    unsigned long regulator_latency;

#ifdef CONFIG_ARM_S3C2416_CPUFREQ_VCORESCALE

    struct regulator *vddarm;

#endif

​

    struct cpufreq_frequency_table *freq_table;

​

    bool is_dvs;

    bool disable_dvs;

};

​

static struct s3c2416_data s3c2416_cpufreq;

​

struct s3c2416_dvfs {

    unsigned int vddarm_min;

    unsigned int vddarm_max;

};

​

/* pseudo-frequency for dvs mode */

#define FREQ_DVS    132333

​

/* frequency to sleep and reboot in

 * it's essential to leave dvs, as some boards do not reconfigure the

 * regulator on reboot

 */

#define FREQ_SLEEP  133333

​

/* Sources for the ARMCLK */

#define SOURCE_HCLK 0

#define SOURCE_ARMDIV   1

​

#ifdef CONFIG_ARM_S3C2416_CPUFREQ_VCORESCALE

/* S3C2416 only supports changing the voltage in the dvs-mode.

 * Voltages down to 1.0V seem to work, so we take what the regulator

 * can get us.

 */

static struct s3c2416_dvfs s3c2416_dvfs_table[] = {

    [SOURCE_HCLK] = {  950000, 1250000 },

    [SOURCE_ARMDIV] = { 1250000, 1350000 },

};

#endif

​

static struct cpufreq_frequency_table s3c2416_freq_table[] = {

    { 0, SOURCE_HCLK, FREQ_DVS },

    { 0, SOURCE_ARMDIV, 133333 },

    { 0, SOURCE_ARMDIV, 266666 },

    { 0, SOURCE_ARMDIV, 400000 },

    { 0, 0, CPUFREQ_TABLE_END },

};

​

static struct cpufreq_frequency_table s3c2450_freq_table[] = {

    { 0, SOURCE_HCLK, FREQ_DVS },

    { 0, SOURCE_ARMDIV, 133500 },

    { 0, SOURCE_ARMDIV, 267000 },

    { 0, SOURCE_ARMDIV, 534000 },

    { 0, 0, CPUFREQ_TABLE_END },

};

​

static unsigned int s3c2416_cpufreq_get_speed(unsigned int cpu)

{

    struct s3c2416_data *s3c_freq = &s3c2416_cpufreq;