linux-imx

/*

 * Copyright 2009 Wolfson Microelectronics plc

 *

 * S3C64xx CPUfreq Support

 *

 * 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) "cpufreq: " fmt

​

#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/module.h>

​

static struct regulator *vddarm;

static unsigned long regulator_latency;

​

#ifdef CONFIG_CPU_S3C6410

struct s3c64xx_dvfs {

    unsigned int vddarm_min;

    unsigned int vddarm_max;

};

​

static struct s3c64xx_dvfs s3c64xx_dvfs_table[] = {

    [0] = { 1000000, 1150000 },

    [1] = { 1050000, 1150000 },

    [2] = { 1100000, 1150000 },

    [3] = { 1200000, 1350000 },

    [4] = { 1300000, 1350000 },

};

​

static struct cpufreq_frequency_table s3c64xx_freq_table[] = {

    { 0, 0,  66000 },

    { 0, 0, 100000 },

    { 0, 0, 133000 },

    { 0, 1, 200000 },

    { 0, 1, 222000 },

    { 0, 1, 266000 },

    { 0, 2, 333000 },

    { 0, 2, 400000 },

    { 0, 2, 532000 },

    { 0, 2, 533000 },

    { 0, 3, 667000 },

    { 0, 4, 800000 },

    { 0, 0, CPUFREQ_TABLE_END },

};

#endif

​

static int s3c64xx_cpufreq_set_target(struct cpufreq_policy *policy,

                      unsigned int index)

{

    struct s3c64xx_dvfs *dvfs;

    unsigned int old_freq, new_freq;

    int ret;

​

    old_freq = clk_get_rate(policy->clk) / 1000;

    new_freq = s3c64xx_freq_table[index].frequency;

    dvfs = &s3c64xx_dvfs_table[s3c64xx_freq_table[index].driver_data];

​

#ifdef CONFIG_REGULATOR

    if (vddarm && new_freq > old_freq) {

        ret = regulator_set_voltage(vddarm,

                        dvfs->vddarm_min,

                        dvfs->vddarm_max);

        if (ret != 0) {

            pr_err("Failed to set VDDARM for %dkHz: %d\n",

                   new_freq, ret);

            return ret;

        }

    }

#endif

​

    ret = clk_set_rate(policy->clk, new_freq * 1000);

    if (ret < 0) {

        pr_err("Failed to set rate %dkHz: %d\n",

               new_freq, ret);

        return ret;

    }

​

#ifdef CONFIG_REGULATOR

    if (vddarm && new_freq < old_freq) {

        ret = regulator_set_voltage(vddarm,

                        dvfs->vddarm_min,

                        dvfs->vddarm_max);

        if (ret != 0) {