summaryrefslogtreecommitdiff
path: root/drivers/usb/dwc3/dwc3-exynos.c
blob: ca6597853f90339358bf670e37e1cad2f65cf4cc (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
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
/**
 * 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/clk.h>
#include <linux/usb/otg.h>
#include <linux/usb/nop-usb-xceiv.h>

#include "core.h"

struct dwc3_exynos {
	struct platform_device	*dwc3;
	struct platform_device	*usb2_phy;
	struct platform_device	*usb3_phy;
	struct device		*dev;

	struct clk		*clk;
};

static int __devinit dwc3_exynos_register_phys(struct dwc3_exynos *exynos)
{
	struct nop_usb_xceiv_platform_data pdata;
	struct platform_device	*pdev;
	int			ret;

	memset(&pdata, 0x00, sizeof(pdata));

	pdev = platform_device_alloc("nop_usb_xceiv", 0);
	if (!pdev)
		return -ENOMEM;

	exynos->usb2_phy = pdev;
	pdata.type = USB_PHY_TYPE_USB2;

	ret = platform_device_add_data(exynos->usb2_phy, &pdata, sizeof(pdata));
	if (ret)
		goto err1;

	pdev = platform_device_alloc("nop_usb_xceiv", 1);
	if (!pdev) {
		ret = -ENOMEM;
		goto err1;
	}

	exynos->usb3_phy = pdev;
	pdata.type = USB_PHY_TYPE_USB3;

	ret = platform_device_add_data(exynos->usb3_phy, &pdata, sizeof(pdata));
	if (ret)
		goto err2;

	ret = platform_device_add(exynos->usb2_phy);
	if (ret)
		goto err2;

	ret = platform_device_add(exynos->usb3_phy);
	if (ret)
		goto err3;

	return 0;

err3:
	platform_device_del(exynos->usb2_phy);

err2:
	platform_device_put(exynos->usb3_phy);

err1:
	platform_device_put(exynos->usb2_phy);

	return ret;
}

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;

	ret = dwc3_exynos_register_phys(exynos);
	if (ret) {
		dev_err(&pdev->dev, "couldn't register PHYs\n");
		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);
	platform_device_unregister(exynos->usb2_phy);
	platform_device_unregister(exynos->usb3_phy);

	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");