forked from rrcarlosr/Jetpack
153 lines
3.8 KiB
C
153 lines
3.8 KiB
C
/*
|
|
* Tegra ACONNECT Bus Driver
|
|
*
|
|
* Copyright (C) 2016-2019, 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;
|
|
const struct tegra_aconnect_soc_data *soc_data;
|
|
};
|
|
|
|
struct tegra_aconnect_soc_data {
|
|
bool is_hv;
|
|
};
|
|
|
|
static const struct tegra_aconnect_soc_data soc_data_tegra = {
|
|
.is_hv = false,
|
|
};
|
|
|
|
static const struct tegra_aconnect_soc_data soc_data_tegra_hv = {
|
|
.is_hv = true,
|
|
};
|
|
|
|
static const struct of_device_id tegra_aconnect_of_match[] = {
|
|
{ .compatible = "nvidia,tegra210-aconnect", .data = &soc_data_tegra },
|
|
{ .compatible = "nvidia,tegra186-aconnect-hv",
|
|
.data = &soc_data_tegra_hv },
|
|
{ }
|
|
};
|
|
static int tegra_aconnect_probe(struct platform_device *pdev)
|
|
{
|
|
struct tegra_aconnect *aconnect;
|
|
const struct of_device_id *match;
|
|
|
|
if (!pdev->dev.of_node)
|
|
return -EINVAL;
|
|
|
|
aconnect = devm_kzalloc(&pdev->dev, sizeof(struct tegra_aconnect),
|
|
GFP_KERNEL);
|
|
if (!aconnect)
|
|
return -ENOMEM;
|
|
|
|
match = of_match_device(tegra_aconnect_of_match, &pdev->dev);
|
|
if (!match) {
|
|
dev_err(&pdev->dev, "Error: No device match found\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
aconnect->soc_data = (struct tegra_aconnect_soc_data *)match->data;
|
|
if (!aconnect->soc_data->is_hv) {
|
|
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;
|
|
}
|
|
|
|
#if IS_MODULE(CONFIG_TEGRA_ACONNECT)
|
|
static int tegra_aconnect_remove(struct platform_device *pdev)
|
|
{
|
|
pm_runtime_disable(&pdev->dev);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static int tegra_aconnect_runtime_resume(struct device *dev)
|
|
{
|
|
struct tegra_aconnect *aconnect = dev_get_drvdata(dev);
|
|
int ret;
|
|
|
|
if (!aconnect->soc_data->is_hv) {
|
|
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);
|
|
if (!aconnect->soc_data->is_hv) {
|
|
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)
|
|
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(of, tegra_aconnect_of_match);
|
|
|
|
static struct platform_driver tegra_aconnect_driver = {
|
|
.probe = tegra_aconnect_probe,
|
|
#if IS_MODULE(CONFIG_TEGRA_ACONNECT)
|
|
.remove = tegra_aconnect_remove,
|
|
#endif
|
|
.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");
|