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  1/*
  2 * Tegra ACONNECT Bus Driver
  3 *
  4 * Copyright (C) 2016, NVIDIA CORPORATION.  All rights reserved.
  5 *
  6 * This file is subject to the terms and conditions of the GNU General Public
  7 * License.  See the file "COPYING" in the main directory of this archive
  8 * for more details.
  9 */
 10
 11#include <linux/clk.h>
 12#include <linux/module.h>
 13#include <linux/of_platform.h>
 14#include <linux/platform_device.h>
 15#include <linux/pm_runtime.h>
 16
 17struct tegra_aconnect {
 18	struct clk	*ape_clk;
 19	struct clk	*apb2ape_clk;
 20};
 21
 22static int tegra_aconnect_probe(struct platform_device *pdev)
 23{
 24	struct tegra_aconnect *aconnect;
 25
 26	if (!pdev->dev.of_node)
 27		return -EINVAL;
 28
 29	aconnect = devm_kzalloc(&pdev->dev, sizeof(struct tegra_aconnect),
 30				GFP_KERNEL);
 31	if (!aconnect)
 32		return -ENOMEM;
 33
 34	aconnect->ape_clk = devm_clk_get(&pdev->dev, "ape");
 35	if (IS_ERR(aconnect->ape_clk)) {
 36		dev_err(&pdev->dev, "Can't retrieve ape clock\n");
 37		return PTR_ERR(aconnect->ape_clk);
 38	}
 39
 40	aconnect->apb2ape_clk = devm_clk_get(&pdev->dev, "apb2ape");
 41	if (IS_ERR(aconnect->apb2ape_clk)) {
 42		dev_err(&pdev->dev, "Can't retrieve apb2ape clock\n");
 43		return PTR_ERR(aconnect->apb2ape_clk);
 44	}
 45
 46	dev_set_drvdata(&pdev->dev, aconnect);
 47	pm_runtime_enable(&pdev->dev);
 48
 49	of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);
 50
 51	dev_info(&pdev->dev, "Tegra ACONNECT bus registered\n");
 52
 53	return 0;
 54}
 55
 56static void tegra_aconnect_remove(struct platform_device *pdev)
 57{
 58	pm_runtime_disable(&pdev->dev);
 59}
 60
 61static int tegra_aconnect_runtime_resume(struct device *dev)
 62{
 63	struct tegra_aconnect *aconnect = dev_get_drvdata(dev);
 64	int ret;
 65
 66	ret = clk_prepare_enable(aconnect->ape_clk);
 67	if (ret) {
 68		dev_err(dev, "ape clk_enable failed: %d\n", ret);
 69		return ret;
 70	}
 71
 72	ret = clk_prepare_enable(aconnect->apb2ape_clk);
 73	if (ret) {
 74		clk_disable_unprepare(aconnect->ape_clk);
 75		dev_err(dev, "apb2ape clk_enable failed: %d\n", ret);
 76		return ret;
 77	}
 78
 79	return 0;
 80}
 81
 82static int tegra_aconnect_runtime_suspend(struct device *dev)
 83{
 84	struct tegra_aconnect *aconnect = dev_get_drvdata(dev);
 85
 86	clk_disable_unprepare(aconnect->ape_clk);
 87	clk_disable_unprepare(aconnect->apb2ape_clk);
 88
 89	return 0;
 90}
 91
 92static const struct dev_pm_ops tegra_aconnect_pm_ops = {
 93	SET_RUNTIME_PM_OPS(tegra_aconnect_runtime_suspend,
 94			   tegra_aconnect_runtime_resume, NULL)
 95	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
 96				      pm_runtime_force_resume)
 97};
 98
 99static const struct of_device_id tegra_aconnect_of_match[] = {
100	{ .compatible = "nvidia,tegra210-aconnect", },
101	{ }
102};
103MODULE_DEVICE_TABLE(of, tegra_aconnect_of_match);
104
105static struct platform_driver tegra_aconnect_driver = {
106	.probe = tegra_aconnect_probe,
107	.remove = tegra_aconnect_remove,
108	.driver = {
109		.name = "tegra-aconnect",
110		.of_match_table = tegra_aconnect_of_match,
111		.pm = &tegra_aconnect_pm_ops,
112	},
113};
114module_platform_driver(tegra_aconnect_driver);
115
116MODULE_DESCRIPTION("NVIDIA Tegra ACONNECT Bus Driver");
117MODULE_AUTHOR("Jon Hunter <jonathanh@nvidia.com>");
118MODULE_LICENSE("GPL v2");