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/*
* Copyright (c) 2012 Samsung Electronics Co., Ltd.
* http://www.samsung.com/
*
* EXYNOS5 INT clock frequency scaling support using DEVFREQ framework
* Based on work done by Jonghwan Choi <jhbird.choi@samsung.com>
* Support for only EXYNOS5250 is present.
*
* 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/module.h>
#include <linux/devfreq.h>
#include <linux/io.h>
#include <linux/pm_opp.h>
#include <linux/slab.h>
#include <linux/suspend.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/pm_qos.h>
#include <linux/regulator/consumer.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include "exynos_ppmu.h"
#define MAX_SAFEVOLT 1100000 /* 1.10V */
/* Assume that the bus is saturated if the utilization is 25% */
#define INT_BUS_SATURATION_RATIO 25
enum int_level_idx {
LV_0,
LV_1,
LV_2,
LV_3,
LV_4,
_LV_END
};
enum exynos_ppmu_list {
PPMU_RIGHT,
PPMU_END,
};
struct busfreq_data_int {
struct device *dev;
struct devfreq *devfreq;
struct regulator *vdd_int;
struct busfreq_ppmu_data ppmu_data;
unsigned long curr_freq;
bool disabled;
struct notifier_block pm_notifier;
struct mutex lock;
struct pm_qos_request int_req;
struct clk *int_clk;
};
struct int_bus_opp_table {
unsigned int idx;
unsigned long clk;
unsigned long volt;
};
static struct int_bus_opp_table exynos5_int_opp_table[] = {
{LV_0, 266000, 1025000},
{LV_1, 200000, 1025000},
{LV_2, 160000, 1025000},
{LV_3, 133000, 1025000},
{LV_4, 100000, 1025000},
{0, 0, 0},
};
static int exynos5_int_setvolt(struct busfreq_data_int *data,
unsigned long volt)
{
return regulator_set_voltage(data->vdd_int, volt, MAX_SAFEVOLT);
}
static int exynos5_busfreq_int_target(struct device *dev, unsigned long *_freq,
u32 flags)
{
int err = 0;
struct platform_device *pdev = container_of(dev, struct platform_device,
dev);
struct busfreq_data_int *data = platform_get_drvdata(pdev);
struct dev_pm_opp *opp;
unsigned long old_freq, freq;
unsigned long volt;
rcu_read_lock();
opp = devfreq_recommended_opp(dev, _freq, flags);
if (IS_ERR(opp)) {
rcu_read_unlock();
dev_err(dev, "%s: Invalid OPP.\n", __func__);
return PTR_ERR(opp);
}
freq = dev_pm_opp_get_freq(opp);
volt = dev_pm_opp_get_voltage(opp);
rcu_read_unlock();
old_freq = data->curr_freq;
if (old_freq == freq)
return 0;
dev_dbg(dev, "targeting %lukHz %luuV\n", freq, volt);
mutex_lock(&data->lock);
if (data->disabled)
goto out;
if (freq > exynos5_int_opp_table[0].clk)
pm_qos_update_request(&data->int_req, freq * 16 / 1000);
else
pm_qos_update_request(&data->int_req, -1);
if (old_freq < freq)
err = exynos5_int_setvolt(data, volt);
if (err)
goto out;
err = clk_set_rate(data->int_clk, freq * 1000);
if (err)
goto out;
if (old_freq > freq)
err = exynos5_int_setvolt(data, volt);
if (err)
goto out;
data->curr_freq = freq;
out:
mutex_unlock(&data->lock);
return err;
}
static int exynos5_int_get_dev_status(struct device *dev,
struct devfreq_dev_status *stat)
{
struct platform_device *pdev = container_of(dev, struct platform_device,
dev);
struct busfreq_data_int *data = platform_get_drvdata(pdev);
struct busfreq_ppmu_data *ppmu_data = &data->ppmu_data;
int busier_dmc;
exynos_read_ppmu(ppmu_data);
busier_dmc = exynos_get_busier_ppmu(ppmu_data);
stat->current_frequency = data->curr_freq;
/* Number of cycles spent on memory access */
stat->busy_time = ppmu_data->ppmu[busier_dmc].count[PPMU_PMNCNT3];
stat->busy_time *= 100 / INT_BUS_SATURATION_RATIO;
stat->total_time = ppmu_data->ppmu[busier_dmc].ccnt;
return 0;
}
static struct devfreq_dev_profile exynos5_devfreq_int_profile = {
.initial_freq = 160000,
.polling_ms = 100,
.target = exynos5_busfreq_int_target,
.get_dev_status = exynos5_int_get_dev_status,
};
static int exynos5250_init_int_tables(struct busfreq_data_int *data)
{
int i, err = 0;
for (i = LV_0; i < _LV_END; i++) {
err = dev_pm_opp_add(data->dev, exynos5_int_opp_table[i].clk,
exynos5_int_opp_table[i].volt);
if (err) {
dev_err(data->dev, "Cannot add opp entries.\n");
return err;
}
}
return 0;
}
static int exynos5_busfreq_int_pm_notifier_event(struct
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