summaryrefslogtreecommitdiff
path: root/drivers/usb/dwc3/dwc3-exynos.c
blob: 48b68b6f0dc82186368028334ac1d6ec32622912 (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
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
// SPDX-License-Identifier: GPL-2.0
/**
 * 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>
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/regulator/consumer.h>

#define DWC3_EXYNOS_MAX_CLOCKS	4

struct dwc3_exynos_driverdata {
	const char		*clk_names[DWC3_EXYNOS_MAX_CLOCKS];
	int			num_clks;
	int			suspend_clk_idx;
};

struct dwc3_exynos {
	struct device		*dev;

	const char		**clk_names;
	struct clk		*clks[DWC3_EXYNOS_MAX_CLOCKS];
	int			num_clks;
	int			suspend_clk_idx;

	struct regulator	*vdd33;
	struct regulator	*vdd10;
};

static int dwc3_exynos_remove_child(struct device *dev, void *unused)
{
	struct platform_device *pdev = to_platform_device(dev);

	platform_device_unregister(pdev);

	return 0;
}

static int dwc3_exynos_probe(struct platform_device *pdev)
{
	struct dwc3_exynos	*exynos;
	struct device		*dev = &pdev->dev;
	struct device_node	*node = dev->of_node;
	const struct dwc3_exynos_driverdata *driver_data;
	int			i, ret;

	exynos = devm_kzalloc(dev, sizeof(*exynos), GFP_KERNEL);
	if (!exynos)
		return -ENOMEM;

	driver_data = of_device_get_match_data(dev);
	exynos->dev = dev;
	exynos->num_clks = driver_data->num_clks;
	exynos->clk_names = (const char **)driver_data->clk_names;
	exynos->suspend_clk_idx = driver_data->suspend_clk_idx;

	platform_set_drvdata(pdev, exynos);

	for (i = 0; i < exynos->num_clks; i++) {
		exynos->clks[i] = devm_clk_get(dev, exynos->clk_names[i]);
		if (IS_ERR(exynos->clks[i])) {
			dev_err(dev, "failed to get clock: %s\n",
				exynos->clk_names[i]);
			return PTR_ERR(exynos->clks[i]);
		}
	}

	for (i = 0; i < exynos->num_clks; i++) {
		ret = clk_prepare_enable(exynos->clks[i]);
		if (ret) {
			while (i-- > 0)
				clk_disable_unprepare(exynos->clks[i]);
			return ret;
		}
	}

	if (exynos->suspend_clk_idx >= 0)
		clk_prepare_enable(exynos->clks[exynos->suspend_clk_idx]);

	exynos->vdd33 = devm_regulator_get(dev, "vdd33");
	if (IS_ERR(exynos->vdd33)) {
		ret = PTR_ERR(exynos->vdd33);
		goto vdd33_err;
	}
	ret = regulator_enable(exynos->vdd33);
	if (ret) {
		dev_err(dev, "Failed to enable VDD33 supply\n");
		goto vdd33_err;
	}

	exynos->vdd10 = devm_regulator_get(dev, "vdd10");
	if (IS_ERR(exynos->vdd10)) {
		ret = PTR_ERR(exynos->vdd10);
		goto vdd10_err;
	}
	ret = regulator_enable(exynos->vdd10);
	if (ret) {
		dev_err(dev, "Failed to enable VDD10 supply\n");
		goto vdd10_err;
	}

	if (node) {
		ret = of_platform_populate(node, NULL, NULL, dev);
		if (ret) {
			dev_err(dev, "failed to add dwc3 core\n");
			goto populate_err;
		}
	} else {
		dev_err(dev, "no device node, failed to add dwc3 core\n");
		ret = -ENODEV;
		goto populate_err;
	}

	return 0;

populate_err:
	regulator_disable(exynos->vdd10);
vdd10_err:
	regulator_disable(exynos->vdd33);
vdd33_err:
	for (i = exynos->num_clks - 1; i >= 0; i--)
		clk_disable_unprepare(exynos->clks[i]);

	if (exynos->suspend_clk_idx >= 0)
		clk_disable_unprepare(exynos->clks[exynos->suspend_clk_idx]);

	return ret;
}

static int dwc3_exynos_remove(struct platform_device *pdev)
{
	struct dwc3_exynos	*exynos = platform_get_drvdata(pdev);
	int i;

	device_for_each_child(&pdev->dev, NULL, dwc3_exynos_remove_child);

	for (i = exynos->num_clks - 1; i >= 0; i--)
		clk_disable_unprepare(exynos->clks[i]);

	if (exynos->suspend_clk_idx >= 0)
		clk_disable_unprepare(exynos->clks[exynos->suspend_clk_idx]);

	regulator_disable(exynos->vdd33);
	regulator_disable(exynos->vdd10);

	return 0;
}

static const struct dwc3_exynos_driverdata exynos5250_drvdata = {
	.clk_names = { "usbdrd30" },
	.num_clks = 1,
	.suspend_clk_idx = -1,
};

static const struct dwc3_exynos_driverdata exynos5420_drvdata = {
	.clk_names = { "usbdrd30", "usbdrd30_susp_clk"},
	.num_clks = 2,
	.suspend_clk_idx = 1,
};

static const struct dwc3_exynos_driverdata exynos5433_drvdata = {
	.clk_names = { "aclk", "susp_clk", "pipe_pclk", "phyclk" },
	.num_clks = 4,
	.suspend_clk_idx = 1,
};

static const struct dwc3_exynos_driverdata exynos7_drvdata = {
	.clk_names = { "usbdrd30", "usbdrd30_susp_clk", "usbdrd30_axius_clk" },
	.num_clks = 3,
	.suspend_clk_idx = 1,
};

static const struct of_device_id exynos_dwc3_match[] = {
	{
		.compatible = "samsung,exynos5250-dwusb3",
		.data = &exynos5250_drvdata,
	}, {
		.compatible = "samsung,exynos5420-dwusb3",
		.data = &exynos5420_drvdata,
	}, {
		.compatible = "samsung,exynos5433-dwusb3",
		.data = &exynos5433_drvdata,
	}, {
		.compatible = "samsung,exynos7-dwusb3",
		.data = &exynos7_drvdata,
	}, {
	}
};
MODULE_DEVICE_TABLE(of, exynos_dwc3_match);

#ifdef CONFIG_PM_SLEEP
static int dwc3_exynos_suspend(struct device *dev)
{
	struct dwc3_exynos *exynos = dev_get_drvdata(dev);
	int i;

	for (i = exynos->num_clks - 1; i >= 0; i--)
		clk_disable_unprepare(exynos->clks[i]);

	regulator_disable(exynos->vdd33);
	regulator_disable(exynos->vdd10);

	return 0;
}

static int dwc3_exynos_resume(struct device *dev)
{
	struct dwc3_exynos *exynos = dev_get_drvdata(dev);
	int i, ret;

	ret = regulator_enable(exynos->vdd33);
	if (ret) {
		dev_err(dev, "Failed to enable VDD33 supply\n");
		return ret;
	}
	ret = regulator_enable(exynos->vdd10);
	if (ret) {
		dev_err(dev, "Failed to enable VDD10 supply\n");
		return ret;
	}

	for (i = 0; i < exynos->num_clks; i++) {
		ret = clk_prepare_enable(exynos->clks[i]);
		if (ret) {
			while (i-- > 0)
				clk_disable_unprepare(exynos->clks[i]);
			return ret;
		}
	}

	return 0;
}

static const struct dev_pm_ops dwc3_exynos_dev_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(dwc3_exynos_suspend, dwc3_exynos_resume)
};

#define DEV_PM_OPS	(&dwc3_exynos_dev_pm_ops)
#else
#define DEV_PM_OPS	NULL
#endif /* CONFIG_PM_SLEEP */

static struct platform_driver dwc3_exynos_driver = {
	.probe		= dwc3_exynos_probe,
	.remove		= dwc3_exynos_remove,
	.driver		= {
		.name	= "exynos-dwc3",
		.of_match_table = exynos_dwc3_match,
		.pm	= DEV_PM_OPS,
	},
};

module_platform_driver(dwc3_exynos_driver);

MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("DesignWare USB3 Exynos Glue Layer");