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/*
* Copyright (c) 2006-2022, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2022-11-21 GuEe-GUI first version
*/
#include <rthw.h>
#include <rtthread.h>
#include <rtdevice.h>
#define DBG_TAG "dvfs.ofw"
#define DBG_LVL DBG_INFO
#include <rtdbg.h>
static rt_err_t ofw_dvfs_setup(struct rt_platform_device *pdev,
struct rt_dvfs_devfreq *devfreq, rt_bool_t is_cpu)
{
struct rt_device *dev = &pdev->parent;
struct rt_dvfs_scaling *scaling = rt_dvfs_devfreq_to_scaling(devfreq);
rt_err_t err;
if (!devfreq)
{
return -RT_EINVAL;
}
scaling->dev = dev;
scaling->ops = &rt_dvfs_devfreq_ops;
if (!scaling->clk)
{
scaling->clk = rt_clk_get_by_index(dev, 0);
if (rt_is_err(scaling->clk))
{
LOG_E("Get clock failed");
return rt_ptr_err(scaling->clk);
}
}
if (!scaling->supply)
{
if (is_cpu)
{
scaling->supply = rt_regulator_get(dev, "cpu");
}
else
{
scaling->supply = rt_regulator_get(dev, "dev");
if (rt_is_err(scaling->supply))
{
scaling->supply = rt_regulator_get(dev, "mem");
}
}
if (rt_is_err(scaling->supply))
{
scaling->supply = RT_NULL;
}
}
if (!scaling->transition_latency)
{
scaling->transition_latency = 1000000;
}
if (!scaling->retry_delay)
{
scaling->retry_delay = 100000;
}
#ifdef RT_USING_DVFS_EVENT
if (!is_cpu && !devfreq->ev && dev->ofw_node)
{
devfreq->ev = rt_dvfs_event_get(dev, "devfreq-event", 0);
if (rt_is_err_or_null(devfreq->ev))
{
devfreq->ev = RT_NULL;
LOG_D("%s: no devfreq-event", rt_dm_dev_get_name(dev));
}
}
#endif
err = rt_dvfs_devfreq_register(devfreq);
if (err)
{
LOG_E("Register devfreq failed: %s", rt_strerror(err));
goto fail;
}
err = rt_dvfs_scaling_set_governor(scaling, RT_DVFS_GOVERNOR_TYPE_ONDEMAND);
if (err)
{
LOG_W("Set ondemand governor failed: %s", rt_strerror(err));
err = rt_dvfs_scaling_set_governor(scaling, RT_DVFS_GOVERNOR_TYPE_PERFORMANCE);
}
LOG_D("Devfreq registered for %s, freq range: %lu-%lu Hz",
rt_dm_dev_get_name(dev), scaling->min_freq, scaling->max_freq);
return RT_EOK;
fail:
if (scaling->clk)
{
rt_clk_put(scaling->clk);
scaling->clk = RT_NULL;
}
if (scaling->supply)
{
rt_regulator_put(scaling->supply);
scaling->supply = RT_NULL;
}
return err;
}
static rt_err_t ofw_cpufreq_probe(struct rt_platform_device *pdev)
{
struct rt_dvfs_cpufreq *cpufreq = pdev->priv;
if (!cpufreq)
{
LOG_E("No cpufreq data");
return -RT_EINVAL;
}
return ofw_dvfs_setup(pdev, rt_dvfs_cpufreq_to_devfreq(cpufreq), RT_TRUE);
}
static rt_err_t ofw_cpufreq_remove(struct rt_platform_device *pdev)
{
struct rt_dvfs_cpufreq *cpufreq = pdev->priv;
if (cpufreq)
{
rt_dvfs_cpufreq_unregister(cpufreq);
pdev->priv = RT_NULL;
}
return RT_EOK;
}
static rt_err_t ofw_devfreq_probe(struct rt_platform_device *pdev)
{
struct rt_dvfs_devfreq *devfreq = pdev->priv;
if (!devfreq)
{
LOG_E("No devfreq data");
return -RT_EINVAL;
}
return ofw_dvfs_setup(pdev, devfreq, RT_FALSE);
}
static rt_err_t ofw_devfreq_remove(struct rt_platform_device *pdev)
{
struct rt_dvfs_devfreq *devfreq = pdev->priv;
if (devfreq)
{
rt_dvfs_devfreq_unregister(devfreq);
pdev->priv = RT_NULL;
}
return RT_EOK;
}
static struct rt_platform_driver ofw_cpufreq_driver =
{
.name = "ofw-cpufreq",
.probe = ofw_cpufreq_probe,
.remove = ofw_cpufreq_remove,
};
RT_PLATFORM_DRIVER_EXPORT(ofw_cpufreq_driver);
static struct rt_platform_driver ofw_devfreq_driver =
{
.name = "ofw-devfreq",
.probe = ofw_devfreq_probe,
.remove = ofw_devfreq_remove,
};
RT_PLATFORM_DRIVER_EXPORT(ofw_devfreq_driver);
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