summaryrefslogtreecommitdiff
path: root/drivers/usb/chipidea/ci_hdrc_tegra.c
blob: bfcee2702d50360b04e698d97a083bb55a6b9346 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
/*
 * Copyright (c) 2016, NVIDIA Corporation
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 */

#include <linux/clk.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/reset.h>

#include <linux/usb/chipidea.h>

#include "ci.h"

struct tegra_udc {
	struct ci_hdrc_platform_data data;
	struct platform_device *dev;

	struct usb_phy *phy;
	struct clk *clk;
};

struct tegra_udc_soc_info {
	unsigned long flags;
};

static const struct tegra_udc_soc_info tegra20_udc_soc_info = {
	.flags = CI_HDRC_REQUIRES_ALIGNED_DMA,
};

static const struct tegra_udc_soc_info tegra30_udc_soc_info = {
	.flags = 0,
};

static const struct tegra_udc_soc_info tegra114_udc_soc_info = {
	.flags = 0,
};

static const struct tegra_udc_soc_info tegra124_udc_soc_info = {
	.flags = 0,
};

static const struct of_device_id tegra_udc_of_match[] = {
	{
		.compatible = "nvidia,tegra20-udc",
		.data = &tegra20_udc_soc_info,
	}, {
		.compatible = "nvidia,tegra30-udc",
		.data = &tegra30_udc_soc_info,
	}, {
		.compatible = "nvidia,tegra114-udc",
		.data = &tegra114_udc_soc_info,
	}, {
		.compatible = "nvidia,tegra124-udc",
		.data = &tegra124_udc_soc_info,
	}, {
		/* sentinel */
	}
};
MODULE_DEVICE_TABLE(of, tegra_udc_of_match);

static int tegra_udc_probe(struct platform_device *pdev)
{
	const struct tegra_udc_soc_info *soc;
	struct tegra_udc *udc;
	int err;

	udc = devm_kzalloc(&pdev->dev, sizeof(*udc), GFP_KERNEL);
	if (!udc)
		return -ENOMEM;

	soc = of_device_get_match_data(&pdev->dev);
	if (!soc) {
		dev_err(&pdev->dev, "failed to match OF data\n");
		return -EINVAL;
	}

	udc->phy = devm_usb_get_phy_by_phandle(&pdev->dev, "nvidia,phy", 0);
	if (IS_ERR(udc->phy)) {
		err = PTR_ERR(udc->phy);
		dev_err(&pdev->dev, "failed to get PHY: %d\n", err);
		return err;
	}

	udc->clk = devm_clk_get(&pdev->dev, NULL);
	if (IS_ERR(udc->clk)) {
		err = PTR_ERR(udc->clk);
		dev_err(&pdev->dev, "failed to get clock: %d\n", err);
		return err;
	}

	err = clk_prepare_enable(udc->clk);
	if (err < 0) {
		dev_err(&pdev->dev, "failed to enable clock: %d\n", err);
		return err;
	}

	/*
	 * Tegra's USB PHY driver doesn't implement optional phy_init()
	 * hook, so we have to power on UDC controller before ChipIdea
	 * driver initialization kicks in.
	 */
	usb_phy_set_suspend(udc->phy, 0);

	/* setup and register ChipIdea HDRC device */
	udc->data.name = "tegra-udc";
	udc->data.flags = soc->flags;
	udc->data.usb_phy = udc->phy;
	udc->data.capoffset = DEF_CAPOFFSET;

	udc->dev = ci_hdrc_add_device(&pdev->dev, pdev->resource,
				      pdev->num_resources, &udc->data);
	if (IS_ERR(udc->dev)) {
		err = PTR_ERR(udc->dev);
		dev_err(&pdev->dev, "failed to add HDRC device: %d\n", err);
		goto fail_power_off;
	}

	platform_set_drvdata(pdev, udc);

	return 0;

fail_power_off:
	usb_phy_set_suspend(udc->phy, 1);
	clk_disable_unprepare(udc->clk);
	return err;
}

static int tegra_udc_remove(struct platform_device *pdev)
{
	struct tegra_udc *udc = platform_get_drvdata(pdev);

	usb_phy_set_suspend(udc->phy, 1);
	clk_disable_unprepare(udc->clk);

	return 0;
}

static struct platform_driver tegra_udc_driver = {
	.driver = {
		.name = "tegra-udc",
		.of_match_table = tegra_udc_of_match,
	},
	.probe = tegra_udc_probe,
	.remove = tegra_udc_remove,
};
module_platform_driver(tegra_udc_driver);

MODULE_DESCRIPTION("NVIDIA Tegra USB device mode driver");
MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");
MODULE_ALIAS("platform:tegra-udc");
MODULE_LICENSE("GPL v2");