Release 4.7 drivers/cpufreq/omap-cpufreq.c
/*
* CPU frequency scaling for OMAP using OPP information
*
* Copyright (C) 2005 Nokia Corporation
* Written by Tony Lindgren <tony@atomide.com>
*
* Based on cpu-sa1110.c, Copyright (C) 2001 Russell King
*
* Copyright (C) 2007-2011 Texas Instruments, Inc.
* - OMAP3/4 support by Rajendra Nayak, Santosh Shilimkar
*
* 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/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/cpufreq.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/pm_opp.h>
#include <linux/cpu.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <asm/smp_plat.h>
#include <asm/cpu.h>
/* OPP tolerance in percentage */
#define OPP_TOLERANCE 4
static struct cpufreq_frequency_table *freq_table;
static atomic_t freq_table_users = ATOMIC_INIT(0);
static struct device *mpu_dev;
static struct regulator *mpu_reg;
static int omap_target(struct cpufreq_policy *policy, unsigned int index)
{
int r, ret;
struct dev_pm_opp *opp;
unsigned long freq, volt = 0, volt_old = 0, tol = 0;
unsigned int old_freq, new_freq;
old_freq = policy->cur;
new_freq = freq_table[index].frequency;
freq = new_freq * 1000;
ret = clk_round_rate(policy->clk, freq);
if (ret < 0) {
dev_warn(mpu_dev,
"CPUfreq: Cannot find matching frequency for %lu\n",
freq);
return ret;
}
freq = ret;
if (mpu_reg) {
rcu_read_lock();
opp = dev_pm_opp_find_freq_ceil(mpu_dev, &freq);
if (IS_ERR(opp)) {
rcu_read_unlock();
dev_err(mpu_dev, "%s: unable to find MPU OPP for %d\n",
__func__, new_freq);
return -EINVAL;
}
volt = dev_pm_opp_get_voltage(opp);
rcu_read_unlock();
tol = volt * OPP_TOLERANCE / 100;
volt_old = regulator_get_voltage(mpu_reg);
}
dev_dbg(mpu_dev, "cpufreq-omap: %u MHz, %ld mV --> %u MHz, %ld mV\n",
old_freq / 1000, volt_old ? volt_old / 1000 : -1,
new_freq / 1000, volt ? volt / 1000 : -1);
/* scaling up? scale voltage before frequency */
if (mpu_reg && (new_freq > old_freq)) {
r = regulator_set_voltage(mpu_reg, volt - tol, volt + tol);
if (r < 0) {
dev_warn(mpu_dev, "%s: unable to scale voltage up.\n",
__func__);
return r;
}
}
ret = clk_set_rate(policy->clk, new_freq * 1000);
/* scaling down? scale voltage after frequency */
if (mpu_reg && (new_freq < old_freq)) {
r = regulator_set_voltage(mpu_reg, volt - tol, volt + tol);
if (r < 0) {
dev_warn(mpu_dev, "%s: unable to scale voltage down.\n",
__func__);
clk_set_rate(policy->clk, old_freq * 1000);
return r;
}
}
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| kevin hilman | kevin hilman | 222 | 67.27% | 3 | 21.43% |
| viresh kumar | viresh kumar | 41 | 12.42% | 4 | 28.57% |
| tony lindgren | tony lindgren | 27 | 8.18% | 1 | 7.14% |
| afzal mohammed | afzal mohammed | 20 | 6.06% | 1 | 7.14% |
| nishanth menon | nishanth menon | 18 | 5.45% | 4 | 28.57% |
| arnd bergmann | arnd bergmann | 2 | 0.61% | 1 | 7.14% |
| Total | 330 | 100.00% | 14 | 100.00% |
static inline void freq_table_free(void)
{
if (atomic_dec_and_test(&freq_table_users))
dev_pm_opp_free_cpufreq_table(mpu_dev, &freq_table);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| nishanth menon | nishanth menon | 25 | 100.00% | 2 | 100.00% |
| Total | 25 | 100.00% | 2 | 100.00% |
static int omap_cpu_init(struct cpufreq_policy *policy)
{
int result;
policy->clk = clk_get(NULL, "cpufreq_ck");
if (IS_ERR(policy->clk))
return PTR_ERR(policy->clk);
if (!freq_table) {
result = dev_pm_opp_init_cpufreq_table(mpu_dev, &freq_table);
if (result) {
dev_err(mpu_dev,
"%s: cpu%d: failed creating freq table[%d]\n",
__func__, policy->cpu, result);
goto fail;
}
}
atomic_inc_return(&freq_table_users);
/* FIXME: what's the actual transition time? */
result = cpufreq_generic_init(policy, freq_table, 300 * 1000);
if (!result)
return 0;
freq_table_free();
fail:
clk_put(policy->clk);
return result;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| nishanth menon | nishanth menon | 34 | 26.98% | 4 | 30.77% |
| tony lindgren | tony lindgren | 30 | 23.81% | 1 | 7.69% |
| viresh kumar | viresh kumar | 22 | 17.46% | 2 | 15.38% |
| kevin hilman | kevin hilman | 19 | 15.08% | 1 | 7.69% |
| rajendra nayak | rajendra nayak | 8 | 6.35% | 1 | 7.69% |
| russell king | russell king | 5 | 3.97% | 1 | 7.69% |
| hiroshi doyu | hiroshi doyu | 4 | 3.17% | 1 | 7.69% |
| santosh shilimkar | santosh shilimkar | 3 | 2.38% | 1 | 7.69% |
| paul walmsley | paul walmsley | 1 | 0.79% | 1 | 7.69% |
| Total | 126 | 100.00% | 13 | 100.00% |
static int omap_cpu_exit(struct cpufreq_policy *policy)
{
freq_table_free();
clk_put(policy->clk);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| hiroshi doyu | hiroshi doyu | 10 | 41.67% | 1 | 25.00% |
| tony lindgren | tony lindgren | 8 | 33.33% | 1 | 25.00% |
| viresh kumar | viresh kumar | 3 | 12.50% | 1 | 25.00% |
| nishanth menon | nishanth menon | 3 | 12.50% | 1 | 25.00% |
| Total | 24 | 100.00% | 4 | 100.00% |
static struct cpufreq_driver omap_driver = {
.flags = CPUFREQ_STICKY | CPUFREQ_NEED_INITIAL_FREQ_CHECK,
.verify = cpufreq_generic_frequency_table_verify,
.target_index = omap_target,
.get = cpufreq_generic_get,
.init = omap_cpu_init,
.exit = omap_cpu_exit,
.name = "omap",
.attr = cpufreq_generic_attr,
};
static int omap_cpufreq_probe(struct platform_device *pdev)
{
mpu_dev = get_cpu_device(0);
if (!mpu_dev) {
pr_warn("%s: unable to get the MPU device\n", __func__);
return -EINVAL;
}
mpu_reg = regulator_get(mpu_dev, "vcc");
if (IS_ERR(mpu_reg)) {
pr_warn("%s: unable to get MPU regulator\n", __func__);
mpu_reg = NULL;
} else {
/*
* Ensure physical regulator is present.
* (e.g. could be dummy regulator.)
*/
if (regulator_get_voltage(mpu_reg) < 0) {
pr_warn("%s: physical regulator not present for MPU\n",
__func__);
regulator_put(mpu_reg);
mpu_reg = NULL;
}
}
return cpufreq_register_driver(&omap_driver);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| kevin hilman | kevin hilman | 66 | 64.08% | 3 | 33.33% |
| nishanth menon | nishanth menon | 21 | 20.39% | 3 | 33.33% |
| tony lindgren | tony lindgren | 13 | 12.62% | 1 | 11.11% |
| joe perches | joe perches | 3 | 2.91% | 2 | 22.22% |
| Total | 103 | 100.00% | 9 | 100.00% |
static int omap_cpufreq_remove(struct platform_device *pdev)
{
return cpufreq_unregister_driver(&omap_driver);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| santosh shilimkar | santosh shilimkar | 10 | 55.56% | 1 | 50.00% |
| nishanth menon | nishanth menon | 8 | 44.44% | 1 | 50.00% |
| Total | 18 | 100.00% | 2 | 100.00% |
static struct platform_driver omap_cpufreq_platdrv = {
.driver = {
.name = "omap-cpufreq",
},
.probe = omap_cpufreq_probe,
.remove = omap_cpufreq_remove,
};
module_platform_driver(omap_cpufreq_platdrv);
MODULE_DESCRIPTION("cpufreq driver for OMAP SoCs");
MODULE_LICENSE("GPL");
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| kevin hilman | kevin hilman | 329 | 40.87% | 5 | 14.29% |
| nishanth menon | nishanth menon | 162 | 20.12% | 11 | 31.43% |
| tony lindgren | tony lindgren | 144 | 17.89% | 1 | 2.86% |
| viresh kumar | viresh kumar | 72 | 8.94% | 7 | 20.00% |
| afzal mohammed | afzal mohammed | 25 | 3.11% | 1 | 2.86% |
| santosh shilimkar | santosh shilimkar | 22 | 2.73% | 1 | 2.86% |
| hiroshi doyu | hiroshi doyu | 19 | 2.36% | 1 | 2.86% |
| russell king | russell king | 11 | 1.37% | 3 | 8.57% |
| joe perches | joe perches | 10 | 1.24% | 2 | 5.71% |
| rajendra nayak | rajendra nayak | 8 | 0.99% | 1 | 2.86% |
| arnd bergmann | arnd bergmann | 2 | 0.25% | 1 | 2.86% |
| paul walmsley | paul walmsley | 1 | 0.12% | 1 | 2.86% |
| Total | 805 | 100.00% | 35 | 100.00% |
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