| /* |
| * |
| * (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; |
| } |
| |