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 int tegra_aconnect_remove(struct platform_device *pdev)
57{
58	pm_runtime_disable(&pdev->dev);
59
60	return 0;
61}
62
63static int tegra_aconnect_runtime_resume(struct device *dev)
64{
65	struct tegra_aconnect *aconnect = dev_get_drvdata(dev);
66	int ret;
67
68	ret = clk_prepare_enable(aconnect->ape_clk);
69	if (ret) {
70		dev_err(dev, "ape clk_enable failed: %d\n", ret);
71		return ret;
72	}
73
74	ret = clk_prepare_enable(aconnect->apb2ape_clk);
75	if (ret) {
76		clk_disable_unprepare(aconnect->ape_clk);
77		dev_err(dev, "apb2ape clk_enable failed: %d\n", ret);
78		return ret;
79	}
80
81	return 0;
82}
83
84static int tegra_aconnect_runtime_suspend(struct device *dev)
85{
86	struct tegra_aconnect *aconnect = dev_get_drvdata(dev);
87
88	clk_disable_unprepare(aconnect->ape_clk);
89	clk_disable_unprepare(aconnect->apb2ape_clk);
90
91	return 0;
92}
93
94static const struct dev_pm_ops tegra_aconnect_pm_ops = {
95	SET_RUNTIME_PM_OPS(tegra_aconnect_runtime_suspend,
96			   tegra_aconnect_runtime_resume, NULL)
97	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
98				      pm_runtime_force_resume)
99};
100
101static const struct of_device_id tegra_aconnect_of_match[] = {
102	{ .compatible = "nvidia,tegra210-aconnect", },
103	{ }
104};
105MODULE_DEVICE_TABLE(of, tegra_aconnect_of_match);
106
107static struct platform_driver tegra_aconnect_driver = {
108	.probe = tegra_aconnect_probe,
109	.remove = tegra_aconnect_remove,
110	.driver = {
111		.name = "tegra-aconnect",
112		.of_match_table = tegra_aconnect_of_match,
113		.pm = &tegra_aconnect_pm_ops,
114	},
115};
116module_platform_driver(tegra_aconnect_driver);
117
118MODULE_DESCRIPTION("NVIDIA Tegra ACONNECT Bus Driver");
119MODULE_AUTHOR("Jon Hunter <jonathanh@nvidia.com>");
120MODULE_LICENSE("GPL v2");
121