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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 <rtthread.h>
#include <rtdevice.h>
#define DBG_TAG "dvfs.rockchip.dmc"
#define DBG_LVL DBG_INFO
#include <rtdbg.h>
struct rockchip_dmcfreq
{
struct rt_dvfs_devfreq devfreq;
struct rt_platform_device *pdev;
};
static const struct rt_ofw_node_id dfi_compat_ids[] =
{
{ .compatible = "rockchip,rk3568-dfi" },
{ .compatible = "rockchip,rk3562-dfi" },
{ .compatible = "rockchip,px30-dfi" },
{ /* sentinel */ }
};
static rt_err_t rockchip_dmc_bind_dfi_event(struct rockchip_dmcfreq *dmc,
struct rt_device *dev)
{
struct rt_ofw_node *np = dev->ofw_node, *ev_np;
for (int i = 0; ; ++i)
{
if (!(ev_np = rt_ofw_parse_phandle(np, "devfreq-events", i)))
{
break;
}
if (rt_ofw_node_match(ev_np, dfi_compat_ids))
{
dmc->devfreq.ev = rt_ofw_data(ev_np);
}
rt_ofw_node_put(ev_np);
if (dmc->devfreq.ev)
{
break;
}
}
if (!dmc->devfreq.ev)
{
LOG_W("%s: no DFI devfreq-event", rt_dm_dev_get_name(dev));
return -RT_ENOENT;
}
return RT_EOK;
}
static rt_err_t rockchip_dmc_probe(struct rt_platform_device *pdev)
{
rt_err_t err;
struct rt_device *dev = &pdev->parent;
struct rockchip_dmcfreq *dmc;
struct rt_dvfs_scaling *scaling;
if (!(dmc = rt_calloc(1, sizeof(*dmc))))
{
return -RT_ENOMEM;
}
dmc->pdev = pdev;
scaling = rt_dvfs_devfreq_to_scaling(&dmc->devfreq);
rt_dm_dev_set_name_auto(dev, "dmc");
if ((err = rt_device_register(dev, rt_dm_dev_get_name(dev), RT_DEVICE_FLAG_DEACTIVATE)))
{
rt_free(dmc);
return err;
}
scaling->dev = dev;
scaling->ops = &rt_dvfs_devfreq_ops;
scaling->clk = rt_clk_get_by_index(dev, 0);
if (rt_is_err(scaling->clk))
{
LOG_W("%s: no dmc clk, event test only", rt_dm_dev_get_name(dev));
scaling->clk = RT_NULL;
}
scaling->supply = rt_regulator_get(dev, "center");
if (rt_is_err(scaling->supply))
{
scaling->supply = RT_NULL;
}
if ((err = rockchip_dmc_bind_dfi_event(dmc, dev)))
{
goto _fail;
}
if ((err = rt_dvfs_devfreq_register(&dmc->devfreq)))
{
goto _fail;
}
if ((err = rt_dvfs_scaling_set_governor(scaling, RT_DVFS_GOVERNOR_TYPE_ONDEMAND)))
{
LOG_W("%s: ondemand failed: %s", rt_dm_dev_get_name(dev), rt_strerror(err));
}
pdev->priv = dmc;
LOG_I("%s: event-only devfreq ready, freq %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);
}
if (scaling->supply)
{
rt_regulator_put(scaling->supply);
}
rt_device_unregister(dev);
rt_free(dmc);
return err;
}
static rt_err_t rockchip_dmc_remove(struct rt_platform_device *pdev)
{
struct rockchip_dmcfreq *dmc = pdev->priv;
if (!dmc)
{
return RT_EOK;
}
rt_dvfs_devfreq_unregister(&dmc->devfreq);
struct rt_dvfs_scaling *scaling = rt_dvfs_devfreq_to_scaling(&dmc->devfreq);
if (scaling->clk)
{
rt_clk_put(scaling->clk);
}
if (scaling->supply)
{
rt_regulator_put(scaling->supply);
}
rt_device_unregister(&pdev->parent);
rt_free(dmc);
pdev->priv = RT_NULL;
return RT_EOK;
}
static const struct rt_ofw_node_id rockchip_dmc_ofw_ids[] =
{
{ .compatible = "rockchip,rk3568-dmc" },
{ .compatible = "rockchip,rk3562-dmc" },
{ /* sentinel */ }
};
static struct rt_platform_driver rockchip_dmc_driver =
{
.name = "rockchip-dmc",
.ids = rockchip_dmc_ofw_ids,
.probe = rockchip_dmc_probe,
.remove = rockchip_dmc_remove,
};
RT_PLATFORM_DRIVER_EXPORT(rockchip_dmc_driver);
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