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/*
*
* (C) COPYRIGHT ARM Limited. All rights reserved.
*
* This program is free software and is provided to you under the terms of the
* GNU General Public License version 2 as published by the Free Software
* Foundation, and any use by you of this program is subject to the terms
* of such GNU licence.
*
* A copy of the licence is included with the program, and can also be obtained
* from Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#include <mali_kbase.h>
#include <mali_kbase_config_defaults.h>
#include <linux/clk.h>
#include <linux/devfreq.h>
#ifdef CONFIG_DEVFREQ_THERMAL
#include <linux/devfreq_cooling.h>
#endif
static int
kbase_devfreq_target(struct device *dev, unsigned long *target_freq, u32 flags)
{
struct kbase_device *kbdev = dev_get_drvdata(dev);
struct opp *opp;
unsigned long freq = 0;
int err;
freq = *target_freq;
rcu_read_lock();
opp = devfreq_recommended_opp(dev, &freq, flags);
rcu_read_unlock();
if (IS_ERR_OR_NULL(opp)) {
dev_err(dev, "Failed to get opp (%ld)\n", PTR_ERR(opp));
return PTR_ERR(opp);
}
/*
* Only update if there is a change of frequency
*/
if (kbdev->freq == freq) {
*target_freq = freq;
return 0;
}
err = clk_set_rate(kbdev->clock, freq);
if (err) {
dev_err(dev, "Failed to set clock %lu (target %lu)\n",
freq, *target_freq);
return err;
}
kbdev->freq = freq;
*target_freq = freq;
kbase_pm_reset_dvfs_utilisation(kbdev);
return 0;
}
static int
kbase_devfreq_cur_freq(struct device *dev, unsigned long *freq)
{
struct kbase_device *kbdev = dev_get_drvdata(dev);
*freq = kbdev->freq;
return 0;
}
static int
kbase_devfreq_status(struct device *dev, struct devfreq_dev_status *stat)
{
struct kbase_device *kbdev = dev_get_drvdata(dev);
stat->current_frequency = kbdev->freq;
kbase_pm_get_dvfs_utilisation(kbdev,
&stat->total_time, &stat->busy_time);
stat->private_data = NULL;
#ifdef CONFIG_DEVFREQ_THERMAL
memcpy(&kbdev->devfreq_cooling->last_status, stat, sizeof(*stat));
#endif
return 0;
}
/* Weak definition to be overriden by platforms */
int __weak setup_opps(void)
{
return 0;
}
static int kbase_devfreq_init_freq_table(struct kbase_device *kbdev,
struct devfreq_dev_profile *dp)
{
int err, count;
int i = 0;
unsigned long freq = 0;
struct opp *opp;
err = setup_opps();
if (err)
return err;
rcu_read_lock();
count = opp_get_opp_count(kbdev->dev);
if (count < 0) {
rcu_read_unlock();
return count;
}
rcu_read_unlock();
dp->freq_table = kmalloc_array(count, sizeof(dp->freq_table[0]),
GFP_KERNEL);
if (!dp->freq_table)
return -ENOMEM;
rcu_read_lock();
for (i = 0; i < count; i++, freq++) {
opp = opp_find_freq_ceil(kbdev->dev, &freq);
if (IS_ERR(opp))
break;
dp->freq_table[i] = freq;
}
rcu_read_unlock();
if (count != i)
dev_warn(kbdev->dev, "Unable to enumerate all OPPs (%d!=%d\n",
count, i);
dp->max_state = i;
return 0;
}
static void kbase_devfreq_term_freq_table(struct kbase_device *kbdev)
{
struct devfreq_dev_profile *dp = kbdev->devfreq->profile;
kfree(dp->freq_table);
}
static void kbase_devfreq_exit(struct device *dev)
{
struct kbase_device *kbdev = dev_get_drvdata(dev);
kbase_devfreq_term_freq_table(kbdev);
}
int kbase_devfreq_init(struct kbase_device *kbdev)
{
struct devfreq_dev_profile *dp;
int err;
dev_dbg(kbdev->dev, "Init Mali devfreq\n");
if (!kbdev->clock)
return -ENODEV;
kbdev->freq = clk_get_rate(kbdev->clock);
dp = &kbdev->devfreq_profile;
dp->initial_freq = kbdev->freq;
dp->polling_ms = 100;
dp->target = kbase_devfreq_target;
dp->get_dev_status = kbase_devfreq_status;
dp->get_cur_freq = kbase_devfreq_cur_freq;
dp->exit = kbase_devfreq_exit;
if (kbase_devfreq_init_freq_table(kbdev, dp))
return -EFAULT;
kbdev->devfreq = devfreq_add_device(kbdev->dev, dp,
"simple_ondemand", NULL);
if (IS_ERR_OR_NULL(kbdev->devfreq)) {
kbase_devfreq_term_freq_table(kbdev);
return PTR_ERR(kbdev->devfreq);
}
err = devfreq_register_opp_notifier(kbdev->dev, kbdev->devfreq);
if (err) {
dev_err(kbdev->dev,
"Failed to register OPP notifier (%d)\n", err);
goto opp_notifier_failed;
}
#ifdef CONFIG_DEVFREQ_THERMAL
{
struct devfreq_cooling_ops *callbacks;
callbacks = (void *)kbasep_get_config_value(kbdev,
kbdev->config_attributes,
KBASE_CONFIG_ATTR_POWER_MODEL_CALLBACKS);
kbdev->devfreq_cooling = of_devfreq_cooling_register_power(
kbdev->dev->of_node,
kbdev->devfreq,
callbacks);
if (IS_ERR_OR_NULL(kbdev->devfreq_cooling)) {
err = PTR_ERR(kbdev->devfreq_cooling);
dev_err(kbdev->dev,
"Failed to register cooling device (%d)\n",
err);
goto cooling_failed;
}
}
#endif
return 0;
#ifdef CONFIG_DEVFREQ_THERMAL
cooling_failed:
devfreq_unregister_opp_notifier(kbdev->dev, kbdev->devfreq);
#endif /* CONFIG_DEVFREQ_THERMAL */
opp_notifier_failed:
err = devfreq_remove_device(kbdev->devfreq);
if (err)
dev_err(kbdev->dev, "Failed to terminate devfreq (%d)\n", err);
else
kbdev->devfreq = NULL;
return err;
}
void kbase_devfreq_term(struct kbase_device *kbdev)
{
int err;
dev_dbg(kbdev->dev, "Term Mali devfreq\n");
#ifdef CONFIG_DEVFREQ_THERMAL
devfreq_cooling_unregister(kbdev->devfreq_cooling);
#endif
devfreq_unregister_opp_notifier(kbdev->dev, kbdev->devfreq);
err = devfreq_remove_device(kbdev->devfreq);
if (err)
dev_err(kbdev->dev, "Failed to terminate devfreq (%d)\n", err);
else
kbdev->devfreq = NULL;
}
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