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/*
* Tegra ACONNECT Bus Driver
*
* Copyright (C) 2016, NVIDIA CORPORATION. All rights reserved.
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
struct tegra_aconnect {
struct clk *ape_clk;
struct clk *apb2ape_clk;
};
static int tegra_aconnect_probe(struct platform_device *pdev)
{
struct tegra_aconnect *aconnect;
if (!pdev->dev.of_node)
return -EINVAL;
aconnect = devm_kzalloc(&pdev->dev, sizeof(struct tegra_aconnect),
GFP_KERNEL);
if (!aconnect)
return -ENOMEM;
aconnect->ape_clk = devm_clk_get(&pdev->dev, "ape");
if (IS_ERR(aconnect->ape_clk)) {
dev_err(&pdev->dev, "Can't retrieve ape clock\n");
return PTR_ERR(aconnect->ape_clk);
}
aconnect->apb2ape_clk = devm_clk_get(&pdev->dev, "apb2ape");
if (IS_ERR(aconnect->apb2ape_clk)) {
dev_err(&pdev->dev, "Can't retrieve apb2ape clock\n");
return PTR_ERR(aconnect->apb2ape_clk);
}
dev_set_drvdata(&pdev->dev, aconnect);
pm_runtime_enable(&pdev->dev);
of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);
dev_info(&pdev->dev, "Tegra ACONNECT bus registered\n");
return 0;
}
static int tegra_aconnect_remove(struct platform_device *pdev)
{
pm_runtime_disable(&pdev->dev);
return 0;
}
static int tegra_aconnect_runtime_resume(struct device *dev)
{
struct tegra_aconnect *aconnect = dev_get_drvdata(dev);
int ret;
ret = clk_prepare_enable(aconnect->ape_clk);
if (ret) {
dev_err(dev, "ape clk_enable failed: %d\n", ret);
return ret;
}
ret = clk_prepare_enable(aconnect->apb2ape_clk);
if (ret) {
clk_disable_unprepare(aconnect->ape_clk);
dev_err(dev, "apb2ape clk_enable failed: %d\n", ret);
return ret;
}
return 0;
}
static int tegra_aconnect_runtime_suspend(struct device *dev)
{
struct tegra_aconnect *aconnect = dev_get_drvdata(dev);
clk_disable_unprepare(aconnect->ape_clk);
clk_disable_unprepare(aconnect->apb2ape_clk);
return 0;
}
static const struct dev_pm_ops tegra_aconnect_pm_ops = {
SET_RUNTIME_PM_OPS(tegra_aconnect_runtime_suspend,
tegra_aconnect_runtime_resume, NULL)
SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
pm_runtime_force_resume)
};
static const struct of_device_id tegra_aconnect_of_match[] = {
{ .compatible = "nvidia,tegra210-aconnect", },
{ }
};
MODULE_DEVICE_TABLE(of, tegra_aconnect_of_match);
static struct platform_driver tegra_aconnect_driver = {
.probe = tegra_aconnect_probe,
.remove = tegra_aconnect_remove,
.driver = {
.name = "tegra-aconnect",
.of_match_table = tegra_aconnect_of_match,
.pm = &tegra_aconnect_pm_ops,
},
};
module_platform_driver(tegra_aconnect_driver);
MODULE_DESCRIPTION("NVIDIA Tegra ACONNECT Bus Driver");
MODULE_AUTHOR("Jon Hunter <jonathanh@nvidia.com>");
MODULE_LICENSE("GPL v2");
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