#include <linux/cpufreq.h>
#include <linux/suspend.h>
-#include <mach/cpufreq.h>
-
#include <plat/cpu.h>
+#include "exynos-cpufreq.h"
+
static struct exynos_dvfs_info *exynos_info;
static struct regulator *arm_regulator;
return clk_get_rate(exynos_info->cpu_clk) / 1000;
}
-static int exynos_target(struct cpufreq_policy *policy,
- unsigned int target_freq,
- unsigned int relation)
+static int exynos_cpufreq_get_index(unsigned int freq)
+{
+ struct cpufreq_frequency_table *freq_table = exynos_info->freq_table;
+ int index;
+
+ for (index = 0;
+ freq_table[index].frequency != CPUFREQ_TABLE_END; index++)
+ if (freq_table[index].frequency == freq)
+ break;
+
+ if (freq_table[index].frequency == CPUFREQ_TABLE_END)
+ return -EINVAL;
+
+ return index;
+}
+
+static int exynos_cpufreq_scale(unsigned int target_freq)
{
- unsigned int index, old_index;
- unsigned int arm_volt, safe_arm_volt = 0;
- int ret = 0;
struct cpufreq_frequency_table *freq_table = exynos_info->freq_table;
unsigned int *volt_table = exynos_info->volt_table;
+ struct cpufreq_policy *policy = cpufreq_cpu_get(0);
+ unsigned int arm_volt, safe_arm_volt = 0;
unsigned int mpll_freq_khz = exynos_info->mpll_freq_khz;
-
- mutex_lock(&cpufreq_lock);
+ int index, old_index;
+ int ret = 0;
freqs.old = policy->cur;
+ freqs.new = target_freq;
+ freqs.cpu = policy->cpu;
- if (frequency_locked && target_freq != locking_frequency) {
- ret = -EAGAIN;
+ if (freqs.new == freqs.old)
goto out;
- }
/*
* The policy max have been changed so that we cannot get proper
* old_index with cpufreq_frequency_table_target(). Thus, ignore
* policy and get the index from the raw freqeuncy table.
*/
- for (old_index = 0;
- freq_table[old_index].frequency != CPUFREQ_TABLE_END;
- old_index++)
- if (freq_table[old_index].frequency == freqs.old)
- break;
-
- if (freq_table[old_index].frequency == CPUFREQ_TABLE_END) {
- ret = -EINVAL;
+ old_index = exynos_cpufreq_get_index(freqs.old);
+ if (old_index < 0) {
+ ret = old_index;
goto out;
}
- if (cpufreq_frequency_table_target(policy, freq_table,
- target_freq, relation, &index)) {
- ret = -EINVAL;
+ index = exynos_cpufreq_get_index(target_freq);
+ if (index < 0) {
+ ret = index;
goto out;
}
- freqs.new = freq_table[index].frequency;
- freqs.cpu = policy->cpu;
-
/*
* ARM clock source will be changed APLL to MPLL temporary
* To support this level, need to control regulator for
/* When the new frequency is higher than current frequency */
if ((freqs.new > freqs.old) && !safe_arm_volt) {
/* Firstly, voltage up to increase frequency */
- regulator_set_voltage(arm_regulator, arm_volt,
- arm_volt);
+ ret = regulator_set_voltage(arm_regulator, arm_volt, arm_volt);
+ if (ret) {
+ pr_err("%s: failed to set cpu voltage to %d\n",
+ __func__, arm_volt);
+ goto out;
+ }
}
- if (safe_arm_volt)
- regulator_set_voltage(arm_regulator, safe_arm_volt,
+ if (safe_arm_volt) {
+ ret = regulator_set_voltage(arm_regulator, safe_arm_volt,
safe_arm_volt);
- if (freqs.new != freqs.old)
- exynos_info->set_freq(old_index, index);
+ if (ret) {
+ pr_err("%s: failed to set cpu voltage to %d\n",
+ __func__, safe_arm_volt);
+ goto out;
+ }
+ }
+
+ exynos_info->set_freq(old_index, index);
for_each_cpu(freqs.cpu, policy->cpus)
cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
/* down the voltage after frequency change */
regulator_set_voltage(arm_regulator, arm_volt,
arm_volt);
+ if (ret) {
+ pr_err("%s: failed to set cpu voltage to %d\n",
+ __func__, arm_volt);
+ goto out;
+ }
+ }
+
+out:
+
+ cpufreq_cpu_put(policy);
+
+ return ret;
+}
+
+static int exynos_target(struct cpufreq_policy *policy,
+ unsigned int target_freq,
+ unsigned int relation)
+{
+ struct cpufreq_frequency_table *freq_table = exynos_info->freq_table;
+ unsigned int index;
+ unsigned int new_freq;
+ int ret = 0;
+
+ mutex_lock(&cpufreq_lock);
+
+ if (frequency_locked)
+ goto out;
+
+ if (cpufreq_frequency_table_target(policy, freq_table,
+ target_freq, relation, &index)) {
+ ret = -EINVAL;
+ goto out;
}
+ new_freq = freq_table[index].frequency;
+
+ ret = exynos_cpufreq_scale(new_freq);
+
out:
mutex_unlock(&cpufreq_lock);
static int exynos_cpufreq_pm_notifier(struct notifier_block *notifier,
unsigned long pm_event, void *v)
{
- struct cpufreq_policy *policy = cpufreq_cpu_get(0); /* boot CPU */
- static unsigned int saved_frequency;
- unsigned int temp;
+ int ret;
- mutex_lock(&cpufreq_lock);
switch (pm_event) {
case PM_SUSPEND_PREPARE:
- if (frequency_locked)
- goto out;
-
+ mutex_lock(&cpufreq_lock);
frequency_locked = true;
+ mutex_unlock(&cpufreq_lock);
- if (locking_frequency) {
- saved_frequency = exynos_getspeed(0);
+ ret = exynos_cpufreq_scale(locking_frequency);
+ if (ret < 0)
+ return NOTIFY_BAD;
- mutex_unlock(&cpufreq_lock);
- exynos_target(policy, locking_frequency,
- CPUFREQ_RELATION_H);
- mutex_lock(&cpufreq_lock);
- }
break;
case PM_POST_SUSPEND:
- if (saved_frequency) {
- /*
- * While frequency_locked, only locking_frequency
- * is valid for target(). In order to use
- * saved_frequency while keeping frequency_locked,
- * we temporarly overwrite locking_frequency.
- */
- temp = locking_frequency;
- locking_frequency = saved_frequency;
-
- mutex_unlock(&cpufreq_lock);
- exynos_target(policy, locking_frequency,
- CPUFREQ_RELATION_H);
- mutex_lock(&cpufreq_lock);
-
- locking_frequency = temp;
- }
+ mutex_lock(&cpufreq_lock);
frequency_locked = false;
+ mutex_unlock(&cpufreq_lock);
break;
}
-out:
- mutex_unlock(&cpufreq_lock);
return NOTIFY_OK;
}
cpufreq_frequency_table_get_attr(exynos_info->freq_table, policy->cpu);
- locking_frequency = exynos_getspeed(0);
-
/* set the transition latency value */
policy->cpuinfo.transition_latency = 100000;
- /*
- * EXYNOS4 multi-core processors has 2 cores
- * that the frequency cannot be set independently.
- * Each cpu is bound to the same speed.
- * So the affected cpu is all of the cpus.
- */
- if (num_online_cpus() == 1) {
- cpumask_copy(policy->related_cpus, cpu_possible_mask);
- cpumask_copy(policy->cpus, cpu_online_mask);
- } else {
- policy->shared_type = CPUFREQ_SHARED_TYPE_ANY;
- cpumask_setall(policy->cpus);
- }
+ cpumask_setall(policy->cpus);
return cpufreq_frequency_table_cpuinfo(policy, exynos_info->freq_table);
}
+static int exynos_cpufreq_cpu_exit(struct cpufreq_policy *policy)
+{
+ cpufreq_frequency_table_put_attr(policy->cpu);
+ return 0;
+}
+
+static struct freq_attr *exynos_cpufreq_attr[] = {
+ &cpufreq_freq_attr_scaling_available_freqs,
+ NULL,
+};
+
static struct cpufreq_driver exynos_driver = {
.flags = CPUFREQ_STICKY,
.verify = exynos_verify_speed,
.target = exynos_target,
.get = exynos_getspeed,
.init = exynos_cpufreq_cpu_init,
+ .exit = exynos_cpufreq_cpu_exit,
.name = "exynos_cpufreq",
+ .attr = exynos_cpufreq_attr,
#ifdef CONFIG_PM
.suspend = exynos_cpufreq_suspend,
.resume = exynos_cpufreq_resume,
goto err_vdd_arm;
}
+ locking_frequency = exynos_getspeed(0);
+
register_pm_notifier(&exynos_cpufreq_nb);
if (cpufreq_register_driver(&exynos_driver)) {
err_cpufreq:
unregister_pm_notifier(&exynos_cpufreq_nb);
- if (!IS_ERR(arm_regulator))
- regulator_put(arm_regulator);
+ regulator_put(arm_regulator);
err_vdd_arm:
kfree(exynos_info);
pr_debug("%s: failed initialization\n", __func__);
projects / karo-tx-linux.git / blobdiff