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/*
*
* (C) COPYRIGHT 2016 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 <linux/thermal.h>
#ifdef CONFIG_DEVFREQ_THERMAL
#include <linux/devfreq_cooling.h>
#endif
#include <linux/of.h>
#include "mali_kbase.h"
#include "mali_kbase_defs.h"
/*
* This model is primarily designed for the Juno platform. It may not be
* suitable for other platforms. The additional resources in this model
* should preferably be minimal, as this model is rarely used when a dynamic
* model is available.
*/
/**
* struct kbase_ipa_model_generic_data - IPA context per device
* @dynamic_coefficient: dynamic coefficient of the model
* @static_coefficient: static coefficient of the model
* @ts: ts of the model
* @gpu_tz: thermal zone device
* @ipa_lock: protects the entire IPA context
*/
struct kbase_ipa_model_generic_data {
u32 dynamic_coefficient;
u32 static_coefficient;
s32 ts[4];
struct thermal_zone_device *gpu_tz;
struct mutex ipa_lock;
};
#define FALLBACK_STATIC_TEMPERATURE 55000
static unsigned long model_static_power(struct kbase_ipa_model *model,
unsigned long voltage)
{
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 3, 0)
unsigned long temperature;
#else
int temperature;
#endif
unsigned long temp;
unsigned long temp_squared, temp_cubed, temp_scaling_factor;
const unsigned long voltage_cubed = (voltage * voltage * voltage) >> 10;
struct kbase_ipa_model_generic_data *model_data =
(struct kbase_ipa_model_generic_data *) model->model_data;
struct thermal_zone_device *gpu_tz = model_data->gpu_tz;
if (gpu_tz) {
int ret;
ret = gpu_tz->ops->get_temp(gpu_tz, &temperature);
if (ret) {
pr_warn_ratelimited("Error reading temperature for gpu thermal zone: %d\n",
ret);
temperature = FALLBACK_STATIC_TEMPERATURE;
}
} else {
temperature = FALLBACK_STATIC_TEMPERATURE;
}
/* Calculate the temperature scaling factor. To be applied to the
* voltage scaled power.
*/
temp = temperature / 1000;
temp_squared = temp * temp;
temp_cubed = temp_squared * temp;
temp_scaling_factor =
(model_data->ts[3] * temp_cubed)
+ (model_data->ts[2] * temp_squared)
+ (model_data->ts[1] * temp)
+ model_data->ts[0];
return (((model_data->static_coefficient * voltage_cubed) >> 20)
* temp_scaling_factor)
/ 1000000;
}
static unsigned long model_dynamic_power(struct kbase_ipa_model *model)
{
struct kbase_ipa_model_generic_data *model_data =
(struct kbase_ipa_model_generic_data *) model->model_data;
return model_data->dynamic_coefficient;
}
static int kbase_generic_power_model_init(struct kbase_ipa_model *model)
{
struct kbase_device *kbdev = model->kbdev;
struct device_node *power_model_node;
const char *tz_name;
u32 static_power, dynamic_power;
u32 voltage, voltage_squared, voltage_cubed, frequency;
struct kbase_ipa_model_generic_data *model_data;
int err;
model_data = kzalloc(sizeof(struct kbase_ipa_model_generic_data),
GFP_KERNEL);
if (!model_data)
return -ENOMEM;
power_model_node = of_get_child_by_name(kbdev->dev->of_node,
"power_model");
if (!power_model_node) {
dev_err(kbdev->dev, "could not find power_model node\n");
err = -ENODEV;
goto error;
}
if (!of_device_is_compatible(power_model_node,
"arm,mali-simple-power-model")) {
dev_err(kbdev->dev, "power_model incompatible with simple power model\n");
err = -ENODEV;
goto error;
}
err = of_property_read_string(power_model_node, "thermal-zone",
&tz_name);
if (err) {
dev_err(kbdev->dev, "thermal zone in power_model not available\n");
goto error;
}
model_data->gpu_tz = thermal_zone_get_zone_by_name(tz_name);
if (IS_ERR(model_data->gpu_tz)) {
pr_warn_ratelimited("Error getting gpu thermal zone (%ld), not yet ready?\n",
PTR_ERR(model_data->gpu_tz));
model_data->gpu_tz = NULL;
err = -EPROBE_DEFER;
goto error;
}
err = of_property_read_u32(power_model_node, "static-power",
&static_power);
if (err) {
dev_err(kbdev->dev, "static-power in power_model not available\n");
goto error;
}
err = of_property_read_u32(power_model_node, "dynamic-power",
&dynamic_power);
if (err) {
dev_err(kbdev->dev, "dynamic-power in power_model not available\n");
goto error;
}
err = of_property_read_u32(power_model_node, "voltage",
&voltage);
if (err) {
dev_err(kbdev->dev, "voltage in power_model not available\n");
goto error;
}
err = of_property_read_u32(power_model_node, "frequency",
&frequency);
if (err) {
dev_err(kbdev->dev, "frequency in power_model not available\n");
goto error;
}
voltage_squared = (voltage * voltage) / 1000;
voltage_cubed = voltage * voltage * voltage;
model_data->static_coefficient =
(static_power << 20) / (voltage_cubed >> 10);
model_data->dynamic_coefficient =
(((dynamic_power * 1000) / voltage_squared) * 1000) / frequency;
err = of_property_read_u32_array(power_model_node,
"ts",
(u32 *)model_data->ts,
4);
if (err) {
dev_err(kbdev->dev, "ts in power_model not available\n");
goto error;
}
model->model_data = (void *) model_data;
return 0;
error:
kfree(model_data);
return err;
}
static void kbase_generic_power_model_term(struct kbase_ipa_model *model)
{
struct kbase_ipa_model_generic_data *model_data =
(struct kbase_ipa_model_generic_data *)model->model_data;
kfree(model_data);
}
struct kbase_ipa_model_ops kbase_generic_ipa_model_ops = {
.name = "generic_ipa_model",
.init = &kbase_generic_power_model_init,
.term = &kbase_generic_power_model_term,
.get_dynamic_power = &model_dynamic_power,
.get_static_power = &model_static_power,
.power_to_state = NULL
};
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