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