1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * Tegra ACONNECT Bus Driver
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * Copyright (C) 2016, NVIDIA CORPORATION. All rights reserved.
5*4882a593Smuzhiyun *
6*4882a593Smuzhiyun * This file is subject to the terms and conditions of the GNU General Public
7*4882a593Smuzhiyun * License. See the file "COPYING" in the main directory of this archive
8*4882a593Smuzhiyun * for more details.
9*4882a593Smuzhiyun */
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun #include <linux/clk.h>
12*4882a593Smuzhiyun #include <linux/module.h>
13*4882a593Smuzhiyun #include <linux/of_platform.h>
14*4882a593Smuzhiyun #include <linux/platform_device.h>
15*4882a593Smuzhiyun #include <linux/pm_runtime.h>
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun struct tegra_aconnect {
18*4882a593Smuzhiyun struct clk *ape_clk;
19*4882a593Smuzhiyun struct clk *apb2ape_clk;
20*4882a593Smuzhiyun };
21*4882a593Smuzhiyun
tegra_aconnect_probe(struct platform_device * pdev)22*4882a593Smuzhiyun static int tegra_aconnect_probe(struct platform_device *pdev)
23*4882a593Smuzhiyun {
24*4882a593Smuzhiyun struct tegra_aconnect *aconnect;
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun if (!pdev->dev.of_node)
27*4882a593Smuzhiyun return -EINVAL;
28*4882a593Smuzhiyun
29*4882a593Smuzhiyun aconnect = devm_kzalloc(&pdev->dev, sizeof(struct tegra_aconnect),
30*4882a593Smuzhiyun GFP_KERNEL);
31*4882a593Smuzhiyun if (!aconnect)
32*4882a593Smuzhiyun return -ENOMEM;
33*4882a593Smuzhiyun
34*4882a593Smuzhiyun aconnect->ape_clk = devm_clk_get(&pdev->dev, "ape");
35*4882a593Smuzhiyun if (IS_ERR(aconnect->ape_clk)) {
36*4882a593Smuzhiyun dev_err(&pdev->dev, "Can't retrieve ape clock\n");
37*4882a593Smuzhiyun return PTR_ERR(aconnect->ape_clk);
38*4882a593Smuzhiyun }
39*4882a593Smuzhiyun
40*4882a593Smuzhiyun aconnect->apb2ape_clk = devm_clk_get(&pdev->dev, "apb2ape");
41*4882a593Smuzhiyun if (IS_ERR(aconnect->apb2ape_clk)) {
42*4882a593Smuzhiyun dev_err(&pdev->dev, "Can't retrieve apb2ape clock\n");
43*4882a593Smuzhiyun return PTR_ERR(aconnect->apb2ape_clk);
44*4882a593Smuzhiyun }
45*4882a593Smuzhiyun
46*4882a593Smuzhiyun dev_set_drvdata(&pdev->dev, aconnect);
47*4882a593Smuzhiyun pm_runtime_enable(&pdev->dev);
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);
50*4882a593Smuzhiyun
51*4882a593Smuzhiyun dev_info(&pdev->dev, "Tegra ACONNECT bus registered\n");
52*4882a593Smuzhiyun
53*4882a593Smuzhiyun return 0;
54*4882a593Smuzhiyun }
55*4882a593Smuzhiyun
tegra_aconnect_remove(struct platform_device * pdev)56*4882a593Smuzhiyun static int tegra_aconnect_remove(struct platform_device *pdev)
57*4882a593Smuzhiyun {
58*4882a593Smuzhiyun pm_runtime_disable(&pdev->dev);
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun return 0;
61*4882a593Smuzhiyun }
62*4882a593Smuzhiyun
tegra_aconnect_runtime_resume(struct device * dev)63*4882a593Smuzhiyun static int tegra_aconnect_runtime_resume(struct device *dev)
64*4882a593Smuzhiyun {
65*4882a593Smuzhiyun struct tegra_aconnect *aconnect = dev_get_drvdata(dev);
66*4882a593Smuzhiyun int ret;
67*4882a593Smuzhiyun
68*4882a593Smuzhiyun ret = clk_prepare_enable(aconnect->ape_clk);
69*4882a593Smuzhiyun if (ret) {
70*4882a593Smuzhiyun dev_err(dev, "ape clk_enable failed: %d\n", ret);
71*4882a593Smuzhiyun return ret;
72*4882a593Smuzhiyun }
73*4882a593Smuzhiyun
74*4882a593Smuzhiyun ret = clk_prepare_enable(aconnect->apb2ape_clk);
75*4882a593Smuzhiyun if (ret) {
76*4882a593Smuzhiyun clk_disable_unprepare(aconnect->ape_clk);
77*4882a593Smuzhiyun dev_err(dev, "apb2ape clk_enable failed: %d\n", ret);
78*4882a593Smuzhiyun return ret;
79*4882a593Smuzhiyun }
80*4882a593Smuzhiyun
81*4882a593Smuzhiyun return 0;
82*4882a593Smuzhiyun }
83*4882a593Smuzhiyun
tegra_aconnect_runtime_suspend(struct device * dev)84*4882a593Smuzhiyun static int tegra_aconnect_runtime_suspend(struct device *dev)
85*4882a593Smuzhiyun {
86*4882a593Smuzhiyun struct tegra_aconnect *aconnect = dev_get_drvdata(dev);
87*4882a593Smuzhiyun
88*4882a593Smuzhiyun clk_disable_unprepare(aconnect->ape_clk);
89*4882a593Smuzhiyun clk_disable_unprepare(aconnect->apb2ape_clk);
90*4882a593Smuzhiyun
91*4882a593Smuzhiyun return 0;
92*4882a593Smuzhiyun }
93*4882a593Smuzhiyun
94*4882a593Smuzhiyun static const struct dev_pm_ops tegra_aconnect_pm_ops = {
95*4882a593Smuzhiyun SET_RUNTIME_PM_OPS(tegra_aconnect_runtime_suspend,
96*4882a593Smuzhiyun tegra_aconnect_runtime_resume, NULL)
97*4882a593Smuzhiyun SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
98*4882a593Smuzhiyun pm_runtime_force_resume)
99*4882a593Smuzhiyun };
100*4882a593Smuzhiyun
101*4882a593Smuzhiyun static const struct of_device_id tegra_aconnect_of_match[] = {
102*4882a593Smuzhiyun { .compatible = "nvidia,tegra210-aconnect", },
103*4882a593Smuzhiyun { }
104*4882a593Smuzhiyun };
105*4882a593Smuzhiyun MODULE_DEVICE_TABLE(of, tegra_aconnect_of_match);
106*4882a593Smuzhiyun
107*4882a593Smuzhiyun static struct platform_driver tegra_aconnect_driver = {
108*4882a593Smuzhiyun .probe = tegra_aconnect_probe,
109*4882a593Smuzhiyun .remove = tegra_aconnect_remove,
110*4882a593Smuzhiyun .driver = {
111*4882a593Smuzhiyun .name = "tegra-aconnect",
112*4882a593Smuzhiyun .of_match_table = tegra_aconnect_of_match,
113*4882a593Smuzhiyun .pm = &tegra_aconnect_pm_ops,
114*4882a593Smuzhiyun },
115*4882a593Smuzhiyun };
116*4882a593Smuzhiyun module_platform_driver(tegra_aconnect_driver);
117*4882a593Smuzhiyun
118*4882a593Smuzhiyun MODULE_DESCRIPTION("NVIDIA Tegra ACONNECT Bus Driver");
119*4882a593Smuzhiyun MODULE_AUTHOR("Jon Hunter <jonathanh@nvidia.com>");
120*4882a593Smuzhiyun MODULE_LICENSE("GPL v2");
121