tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
15struct 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
23struct tegra_udc_soc_info {
24 unsigned long flags;
25};
26
27static const struct tegra_udc_soc_info tegra20_udc_soc_info = {
28 .flags = CI_HDRC_REQUIRES_ALIGNED_DMA,
29};
30
31static const struct tegra_udc_soc_info tegra30_udc_soc_info = {
32 .flags = CI_HDRC_REQUIRES_ALIGNED_DMA,
33};
34
35static const struct tegra_udc_soc_info tegra114_udc_soc_info = {
36 .flags = 0,
37};
38
39static const struct tegra_udc_soc_info tegra124_udc_soc_info = {
40 .flags = 0,
41};
42
43static const struct of_device_id tegra_udc_of_match[] = {
44 {
45 .compatible = "nvidia,tegra20-udc",
46 .data = &tegra20_udc_soc_info,
47 }, {
48 .compatible = "nvidia,tegra30-udc",
49 .data = &tegra30_udc_soc_info,
50 }, {
51 .compatible = "nvidia,tegra114-udc",
52 .data = &tegra114_udc_soc_info,
53 }, {
54 .compatible = "nvidia,tegra124-udc",
55 .data = &tegra124_udc_soc_info,
56 }, {
57 /* sentinel */
58 }
59};
60MODULE_DEVICE_TABLE(of, tegra_udc_of_match);
61
62static int tegra_udc_probe(struct platform_device *pdev)
63{
64 const struct tegra_udc_soc_info *soc;
65 struct tegra_udc *udc;
66 int err;
67
68 udc = devm_kzalloc(&pdev->dev, sizeof(*udc), GFP_KERNEL);
69 if (!udc)
70 return -ENOMEM;
71
72 soc = of_device_get_match_data(&pdev->dev);
73 if (!soc) {
74 dev_err(&pdev->dev, "failed to match OF data\n");
75 return -EINVAL;
76 }
77
78 udc->phy = devm_usb_get_phy_by_phandle(&pdev->dev, "nvidia,phy", 0);
79 if (IS_ERR(udc->phy)) {
80 err = PTR_ERR(udc->phy);
81 dev_err(&pdev->dev, "failed to get PHY: %d\n", err);
82 return err;
83 }
84
85 udc->clk = devm_clk_get(&pdev->dev, NULL);
86 if (IS_ERR(udc->clk)) {
87 err = PTR_ERR(udc->clk);
88 dev_err(&pdev->dev, "failed to get clock: %d\n", err);
89 return err;
90 }
91
92 err = clk_prepare_enable(udc->clk);
93 if (err < 0) {
94 dev_err(&pdev->dev, "failed to enable clock: %d\n", err);
95 return err;
96 }
97
98 /*
99 * Tegra's USB PHY driver doesn't implement optional phy_init()
100 * hook, so we have to power on UDC controller before ChipIdea
101 * driver initialization kicks in.
102 */
103 usb_phy_set_suspend(udc->phy, 0);
104
105 /* setup and register ChipIdea HDRC device */
106 udc->data.name = "tegra-udc";
107 udc->data.flags = soc->flags;
108 udc->data.usb_phy = udc->phy;
109 udc->data.capoffset = DEF_CAPOFFSET;
110
111 udc->dev = ci_hdrc_add_device(&pdev->dev, pdev->resource,
112 pdev->num_resources, &udc->data);
113 if (IS_ERR(udc->dev)) {
114 err = PTR_ERR(udc->dev);
115 dev_err(&pdev->dev, "failed to add HDRC device: %d\n", err);
116 goto fail_power_off;
117 }
118
119 platform_set_drvdata(pdev, udc);
120
121 return 0;
122
123fail_power_off:
124 usb_phy_set_suspend(udc->phy, 1);
125 clk_disable_unprepare(udc->clk);
126 return err;
127}
128
129static int tegra_udc_remove(struct platform_device *pdev)
130{
131 struct tegra_udc *udc = platform_get_drvdata(pdev);
132
133 usb_phy_set_suspend(udc->phy, 1);
134 clk_disable_unprepare(udc->clk);
135
136 return 0;
137}
138
139static struct platform_driver tegra_udc_driver = {
140 .driver = {
141 .name = "tegra-udc",
142 .of_match_table = tegra_udc_of_match,
143 },
144 .probe = tegra_udc_probe,
145 .remove = tegra_udc_remove,
146};
147module_platform_driver(tegra_udc_driver);
148
149MODULE_DESCRIPTION("NVIDIA Tegra USB device mode driver");
150MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");
151MODULE_ALIAS("platform:tegra-udc");
152MODULE_LICENSE("GPL v2");