1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (c) 2016, NVIDIA Corporation
4  */
5 
6 #include <linux/clk.h>
7 #include <linux/module.h>
8 #include <linux/of_device.h>
9 #include <linux/reset.h>
10 
11 #include <linux/usb/chipidea.h>
12 
13 #include "ci.h"
14 
15 struct tegra_udc {
16 	struct ci_hdrc_platform_data data;
17 	struct platform_device *dev;
18 
19 	struct usb_phy *phy;
20 	struct clk *clk;
21 };
22 
23 struct tegra_udc_soc_info {
24 	unsigned long flags;
25 };
26 
27 static const struct tegra_udc_soc_info tegra_udc_soc_info = {
28 	.flags = CI_HDRC_REQUIRES_ALIGNED_DMA,
29 };
30 
31 static const struct of_device_id tegra_udc_of_match[] = {
32 	{
33 		.compatible = "nvidia,tegra20-udc",
34 		.data = &tegra_udc_soc_info,
35 	}, {
36 		.compatible = "nvidia,tegra30-udc",
37 		.data = &tegra_udc_soc_info,
38 	}, {
39 		.compatible = "nvidia,tegra114-udc",
40 		.data = &tegra_udc_soc_info,
41 	}, {
42 		.compatible = "nvidia,tegra124-udc",
43 		.data = &tegra_udc_soc_info,
44 	}, {
45 		/* sentinel */
46 	}
47 };
48 MODULE_DEVICE_TABLE(of, tegra_udc_of_match);
49 
50 static int tegra_udc_probe(struct platform_device *pdev)
51 {
52 	const struct tegra_udc_soc_info *soc;
53 	struct tegra_udc *udc;
54 	int err;
55 
56 	udc = devm_kzalloc(&pdev->dev, sizeof(*udc), GFP_KERNEL);
57 	if (!udc)
58 		return -ENOMEM;
59 
60 	soc = of_device_get_match_data(&pdev->dev);
61 	if (!soc) {
62 		dev_err(&pdev->dev, "failed to match OF data\n");
63 		return -EINVAL;
64 	}
65 
66 	udc->phy = devm_usb_get_phy_by_phandle(&pdev->dev, "nvidia,phy", 0);
67 	if (IS_ERR(udc->phy)) {
68 		err = PTR_ERR(udc->phy);
69 		dev_err(&pdev->dev, "failed to get PHY: %d\n", err);
70 		return err;
71 	}
72 
73 	udc->clk = devm_clk_get(&pdev->dev, NULL);
74 	if (IS_ERR(udc->clk)) {
75 		err = PTR_ERR(udc->clk);
76 		dev_err(&pdev->dev, "failed to get clock: %d\n", err);
77 		return err;
78 	}
79 
80 	err = clk_prepare_enable(udc->clk);
81 	if (err < 0) {
82 		dev_err(&pdev->dev, "failed to enable clock: %d\n", err);
83 		return err;
84 	}
85 
86 	/*
87 	 * Tegra's USB PHY driver doesn't implement optional phy_init()
88 	 * hook, so we have to power on UDC controller before ChipIdea
89 	 * driver initialization kicks in.
90 	 */
91 	usb_phy_set_suspend(udc->phy, 0);
92 
93 	/* setup and register ChipIdea HDRC device */
94 	udc->data.name = "tegra-udc";
95 	udc->data.flags = soc->flags;
96 	udc->data.usb_phy = udc->phy;
97 	udc->data.capoffset = DEF_CAPOFFSET;
98 
99 	udc->dev = ci_hdrc_add_device(&pdev->dev, pdev->resource,
100 				      pdev->num_resources, &udc->data);
101 	if (IS_ERR(udc->dev)) {
102 		err = PTR_ERR(udc->dev);
103 		dev_err(&pdev->dev, "failed to add HDRC device: %d\n", err);
104 		goto fail_power_off;
105 	}
106 
107 	platform_set_drvdata(pdev, udc);
108 
109 	return 0;
110 
111 fail_power_off:
112 	usb_phy_set_suspend(udc->phy, 1);
113 	clk_disable_unprepare(udc->clk);
114 	return err;
115 }
116 
117 static int tegra_udc_remove(struct platform_device *pdev)
118 {
119 	struct tegra_udc *udc = platform_get_drvdata(pdev);
120 
121 	ci_hdrc_remove_device(udc->dev);
122 	usb_phy_set_suspend(udc->phy, 1);
123 	clk_disable_unprepare(udc->clk);
124 
125 	return 0;
126 }
127 
128 static struct platform_driver tegra_udc_driver = {
129 	.driver = {
130 		.name = "tegra-udc",
131 		.of_match_table = tegra_udc_of_match,
132 	},
133 	.probe = tegra_udc_probe,
134 	.remove = tegra_udc_remove,
135 };
136 module_platform_driver(tegra_udc_driver);
137 
138 MODULE_DESCRIPTION("NVIDIA Tegra USB device mode driver");
139 MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");
140 MODULE_ALIAS("platform:tegra-udc");
141 MODULE_LICENSE("GPL v2");
142