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/*
*
* (C) COPYRIGHT 2011-2016 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/devfreq_cooling.h>
#include <linux/thermal.h>
#include <linux/of.h>
#include <mali_kbase.h>
#include <mali_kbase_defs.h>
#include <backend/gpu/mali_kbase_power_model_simple.h>
/*
* This model is primarily designed for the Juno platform. It may not be
* suitable for other platforms.
*/
#define FALLBACK_STATIC_TEMPERATURE 55000
static u32 dynamic_coefficient;
static u32 static_coefficient;
static s32 ts[4];
static struct thermal_zone_device *gpu_tz;
static unsigned long model_static_power(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;
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 =
(ts[3] * temp_cubed)
+ (ts[2] * temp_squared)
+ (ts[1] * temp)
+ ts[0];
return (((static_coefficient * voltage_cubed) >> 20)
* temp_scaling_factor)
/ 1000000;
}
static unsigned long model_dynamic_power(unsigned long freq,
unsigned long voltage)
{
/* The inputs: freq (f) is in Hz, and voltage (v) in mV.
* The coefficient (c) is in mW/(MHz mV mV).
*
* This function calculates the dynamic power after this formula:
* Pdyn (mW) = c (mW/(MHz*mV*mV)) * v (mV) * v (mV) * f (MHz)
*/
const unsigned long v2 = (voltage * voltage) / 1000; /* m*(V*V) */
const unsigned long f_mhz = freq / 1000000; /* MHz */
return (dynamic_coefficient * v2 * f_mhz) / 1000000; /* mW */
}
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 4, 0)
struct devfreq_cooling_ops power_model_simple_ops = {
#else
struct devfreq_cooling_power power_model_simple_ops = {
#endif
.get_static_power = model_static_power,
.get_dynamic_power = model_dynamic_power,
};
int kbase_power_model_simple_init(struct kbase_device *kbdev)
{
struct device_node *power_model_node;
const char *tz_name;
u32 static_power, dynamic_power;
u32 voltage, voltage_squared, voltage_cubed, frequency;
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");
return -ENODEV;
}
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");
return -ENODEV;
}
if (of_property_read_string(power_model_node, "thermal-zone",
&tz_name)) {
dev_err(kbdev->dev, "ts in power_model not available\n");
return -EINVAL;
}
gpu_tz = thermal_zone_get_zone_by_name(tz_name);
if (IS_ERR(gpu_tz)) {
pr_warn_ratelimited("Error getting gpu thermal zone (%ld), not yet ready?\n",
PTR_ERR(gpu_tz));
gpu_tz = NULL;
return -EPROBE_DEFER;
}
if (of_property_read_u32(power_model_node, "static-power",
&static_power)) {
dev_err(kbdev->dev, "static-power in power_model not available\n");
return -EINVAL;
}
if (of_property_read_u32(power_model_node, "dynamic-power",
&dynamic_power)) {
dev_err(kbdev->dev, "dynamic-power in power_model not available\n");
return -EINVAL;
}
if (of_property_read_u32(power_model_node, "voltage",
&voltage)) {
dev_err(kbdev->dev, "voltage in power_model not available\n");
return -EINVAL;
}
if (of_property_read_u32(power_model_node, "frequency",
&frequency)) {
dev_err(kbdev->dev, "frequency in power_model not available\n");
return -EINVAL;
}
voltage_squared = (voltage * voltage) / 1000;
voltage_cubed = voltage * voltage * voltage;
static_coefficient = (static_power << 20) / (voltage_cubed >> 10);
dynamic_coefficient = (((dynamic_power * 1000) / voltage_squared)
* 1000) / frequency;
if (of_property_read_u32_array(power_model_node, "ts", (u32 *)ts, 4)) {
dev_err(kbdev->dev, "ts in power_model not available\n");
return -EINVAL;
}
return 0;
}
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