summaryrefslogtreecommitdiff
path: root/drivers/usb/dwc3/dwc3-exynos.c
blob: d19030198086ad9395e2e2629919d53b4ec163e2 (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
/**
 * dwc3-exynos.c - Samsung EXYNOS DWC3 Specific Glue layer
 *
 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
 *		http://www.samsung.com
 *
 * Author: Anton Tikhomirov <av.tikhomirov@samsung.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/platform_data/dwc3-exynos.h>
#include <linux/dma-mapping.h>
#include <linux/module.h>
#include <linux/clk.h>

#include "core.h"

struct dwc3_exynos {
	struct platform_device	*dwc3;
	struct device		*dev;

	struct clk		*clk;
};

static int __devinit dwc3_exynos_probe(struct platform_device *pdev)
{
	struct dwc3_exynos_data	*pdata = pdev->dev.platform_data;
	struct platform_device	*dwc3;
	struct dwc3_exynos	*exynos;
	struct clk		*clk;

	int			devid;
	int			ret = -ENOMEM;

	exynos = kzalloc(sizeof(*exynos), GFP_KERNEL);
	if (!exynos) {
		dev_err(&pdev->dev, "not enough memory\n");
		goto err0;
	}

	platform_set_drvdata(pdev, exynos);

	devid = dwc3_get_device_id();
	if (devid < 0)
		goto err1;

	dwc3 = platform_device_alloc("dwc3", devid);
	if (!dwc3) {
		dev_err(&pdev->dev, "couldn't allocate dwc3 device\n");
		goto err2;
	}

	clk = clk_get(&pdev->dev, "usbdrd30");
	if (IS_ERR(clk)) {
		dev_err(&pdev->dev, "couldn't get clock\n");
		ret = -EINVAL;
		goto err3;
	}

	dma_set_coherent_mask(&dwc3->dev, pdev->dev.coherent_dma_mask);

	dwc3->dev.parent = &pdev->dev;
	dwc3->dev.dma_mask = pdev->dev.dma_mask;
	dwc3->dev.dma_parms = pdev->dev.dma_parms;
	exynos->dwc3	= dwc3;
	exynos->dev	= &pdev->dev;
	exynos->clk	= clk;

	clk_enable(exynos->clk);

	/* PHY initialization */
	if (!pdata) {
		dev_dbg(&pdev->dev, "missing platform data\n");
	} else {
		if (pdata->phy_init)
			pdata->phy_init(pdev, pdata->phy_type);
	}

	ret = platform_device_add_resources(dwc3, pdev->resource,
			pdev->num_resources);
	if (ret) {
		dev_err(&pdev->dev, "couldn't add resources to dwc3 device\n");
		goto err4;
	}

	ret = platform_device_add(dwc3);
	if (ret) {
		dev_err(&pdev->dev, "failed to register dwc3 device\n");
		goto err4;
	}

	return 0;

err4:
	if (pdata && pdata->phy_exit)
		pdata->phy_exit(pdev, pdata->phy_type);

	clk_disable(clk);
	clk_put(clk);
err3:
	platform_device_put(dwc3);
err2:
	dwc3_put_device_id(devid);
err1:
	kfree(exynos);
err0:
	return ret;
}

static int __devexit dwc3_exynos_remove(struct platform_device *pdev)
{
	struct dwc3_exynos	*exynos = platform_get_drvdata(pdev);
	struct dwc3_exynos_data *pdata = pdev->dev.platform_data;

	platform_device_unregister(exynos->dwc3);

	dwc3_put_device_id(exynos->dwc3->id);

	if (pdata && pdata->phy_exit)
		pdata->phy_exit(pdev, pdata->phy_type);

	clk_disable(exynos->clk);
	clk_put(exynos->clk);

	kfree(exynos);

	return 0;
}

static struct platform_driver dwc3_exynos_driver = {
	.probe		= dwc3_exynos_probe,
	.remove		= __devexit_p(dwc3_exynos_remove),
	.driver		= {
		.name	= "exynos-dwc3",
	},
};

module_platform_driver(dwc3_exynos_driver);

MODULE_ALIAS("platform:exynos-dwc3");
MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("DesignWare USB3 EXYNOS Glue Layer");