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
tegra_udc_probe(struct platform_device * pdev)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 /* setup and register ChipIdea HDRC device */
87 udc->data.name = "tegra-udc";
88 udc->data.flags = soc->flags;
89 udc->data.usb_phy = udc->phy;
90 udc->data.capoffset = DEF_CAPOFFSET;
91
92 udc->dev = ci_hdrc_add_device(&pdev->dev, pdev->resource,
93 pdev->num_resources, &udc->data);
94 if (IS_ERR(udc->dev)) {
95 err = PTR_ERR(udc->dev);
96 dev_err(&pdev->dev, "failed to add HDRC device: %d\n", err);
97 goto fail_power_off;
98 }
99
100 platform_set_drvdata(pdev, udc);
101
102 return 0;
103
104 fail_power_off:
105 clk_disable_unprepare(udc->clk);
106 return err;
107 }
108
tegra_udc_remove(struct platform_device * pdev)109 static int tegra_udc_remove(struct platform_device *pdev)
110 {
111 struct tegra_udc *udc = platform_get_drvdata(pdev);
112
113 ci_hdrc_remove_device(udc->dev);
114 clk_disable_unprepare(udc->clk);
115
116 return 0;
117 }
118
119 static struct platform_driver tegra_udc_driver = {
120 .driver = {
121 .name = "tegra-udc",
122 .of_match_table = tegra_udc_of_match,
123 },
124 .probe = tegra_udc_probe,
125 .remove = tegra_udc_remove,
126 };
127 module_platform_driver(tegra_udc_driver);
128
129 MODULE_DESCRIPTION("NVIDIA Tegra USB device mode driver");
130 MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");
131 MODULE_ALIAS("platform:tegra-udc");
132 MODULE_LICENSE("GPL v2");
133