aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/usb/phy/phy-omap-usb2.c
blob: d266861d24f73978c682fed2a1e59518106f3758 (plain) (blame)
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
268
269
270
271
272
/*
 * omap-usb2.c - USB PHY, talking to musb controller in OMAP.
 *
 * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.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.
 *
 * Author: Kishon Vijay Abraham I <kishon@ti.com>
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */

#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/io.h>
#include <linux/usb/omap_usb.h>
#include <linux/usb/phy_companion.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/pm_runtime.h>
#include <linux/delay.h>
#include <linux/usb/omap_control_usb.h>

/**
 * omap_usb2_set_comparator - links the comparator present in the sytem with
 *	this phy
 * @comparator - the companion phy(comparator) for this phy
 *
 * The phy companion driver should call this API passing the phy_companion
 * filled with set_vbus and start_srp to be used by usb phy.
 *
 * For use by phy companion driver
 */
int omap_usb2_set_comparator(struct phy_companion *comparator)
{
	struct omap_usb	*phy;
	struct usb_phy	*x = usb_get_phy(USB_PHY_TYPE_USB2);

	if (IS_ERR(x))
		return -ENODEV;

	phy = phy_to_omapusb(x);
	phy->comparator = comparator;
	return 0;
}
EXPORT_SYMBOL_GPL(omap_usb2_set_comparator);

static int omap_usb_set_vbus(struct usb_otg *otg, bool enabled)
{
	struct omap_usb *phy = phy_to_omapusb(otg->phy);

	if (!phy->comparator)
		return -ENODEV;

	return phy->comparator->set_vbus(phy->comparator, enabled);
}

static int omap_usb_start_srp(struct usb_otg *otg)
{
	struct omap_usb *phy = phy_to_omapusb(otg->phy);

	if (!phy->comparator)
		return -ENODEV;

	return phy->comparator->start_srp(phy->comparator);
}

static int omap_usb_set_host(struct usb_otg *otg, struct usb_bus *host)
{
	struct usb_phy	*phy = otg->phy;

	otg->host = host;
	if (!host)
		phy->state = OTG_STATE_UNDEFINED;

	return 0;
}

static int omap_usb_set_peripheral(struct usb_otg *otg,
		struct usb_gadget *gadget)
{
	struct usb_phy	*phy = otg->phy;

	otg->gadget = gadget;
	if (!gadget)
		phy->state = OTG_STATE_UNDEFINED;

	return 0;
}

static int omap_usb2_suspend(struct usb_phy *x, int suspend)
{
	struct omap_usb *phy = phy_to_omapusb(x);
	int ret;

	if (suspend && !phy->is_suspended) {
		omap_control_usb_phy_power(phy->control_dev, 0);
		pm_runtime_put_sync(phy->dev);
		phy->is_suspended = 1;
	} else if (!suspend && phy->is_suspended) {
		ret = pm_runtime_get_sync(phy->dev);
		if (ret < 0) {
			dev_err(phy->dev, "get_sync failed with err %d\n", ret);
			return ret;
		}
		omap_control_usb_phy_power(phy->control_dev, 1);
		phy->is_suspended = 0;
	}

	return 0;
}

static int omap_usb2_probe(struct platform_device *pdev)
{
	struct omap_usb			*phy;
	struct usb_otg			*otg;

	phy = devm_kzalloc(&pdev->dev, sizeof(*phy), GFP_KERNEL);
	if (!phy) {
		dev_err(&pdev->dev, "unable to allocate memory for USB2 PHY\n");
		return -ENOMEM;
	}

	otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
	if (!otg) {
		dev_err(&pdev->dev, "unable to allocate memory for USB OTG\n");
		return -ENOMEM;
	}

	phy->dev		= &pdev->dev;

	phy->phy.dev		= phy->dev;
	phy->phy.label		= "omap-usb2";
	phy->phy.set_suspend	= omap_usb2_suspend;
	phy->phy.otg		= otg;
	phy->phy.type		= USB_PHY_TYPE_USB2;

	phy->control_dev = omap_get_control_dev();
	if (IS_ERR(phy->control_dev)) {
		dev_dbg(&pdev->dev, "Failed to get control device\n");
		return -ENODEV;
	}

	phy->is_suspended	= 1;
	omap_control_usb_phy_power(phy->control_dev, 0);

	otg->set_host		= omap_usb_set_host;
	otg->set_peripheral	= omap_usb_set_peripheral;
	otg->set_vbus		= omap_usb_set_vbus;
	otg->start_srp		= omap_usb_start_srp;
	otg->phy		= &phy->phy;

	phy->wkupclk = devm_clk_get(phy->dev, "usb_phy_cm_clk32k");
	if (IS_ERR(phy->wkupclk)) {
		dev_err(&pdev->dev, "unable to get usb_phy_cm_clk32k\n");
		return PTR_ERR(phy->wkupclk);
	}
	clk_prepare(phy->wkupclk);

	phy->optclk = devm_clk_get(phy->dev, "usb_otg_ss_refclk960m");
	if (IS_ERR(phy->optclk))
		dev_vdbg(&pdev->dev, "unable to get refclk960m\n");
	else
		clk_prepare(phy->optclk);

	usb_add_phy_dev(&phy->phy);

	platform_set_drvdata(pdev, phy);

	pm_runtime_enable(phy->dev);

	return 0;
}

static int omap_usb2_remove(struct platform_device *pdev)
{
	struct omap_usb	*phy = platform_get_drvdata(pdev);

	clk_unprepare(phy->wkupclk);
	if (!IS_ERR(phy->optclk))
		clk_unprepare(phy->optclk);
	usb_remove_phy(&phy->phy);

	return 0;
}

#ifdef CONFIG_PM_RUNTIME

static int omap_usb2_runtime_suspend(struct device *dev)
{
	struct platform_device	*pdev = to_platform_device(dev);
	struct omap_usb	*phy = platform_get_drvdata(pdev);

	clk_disable(phy->wkupclk);
	if (!IS_ERR(phy->optclk))
		clk_disable(phy->optclk);

	return 0;
}

static int omap_usb2_runtime_resume(struct device *dev)
{
	struct platform_device	*pdev = to_platform_device(dev);
	struct omap_usb	*phy = platform_get_drvdata(pdev);
	int ret;

	ret = clk_enable(phy->wkupclk);
	if (ret < 0) {
		dev_err(phy->dev, "Failed to enable wkupclk %d\n", ret);
		goto err0;
	}

	if (!IS_ERR(phy->optclk)) {
		ret = clk_enable(phy->optclk);
		if (ret < 0) {
			dev_err(phy->dev, "Failed to enable optclk %d\n", ret);
			goto err1;
		}
	}

	return 0;

err1:
	clk_disable(phy->wkupclk);

err0:
	return ret;
}

static const struct dev_pm_ops omap_usb2_pm_ops = {
	SET_RUNTIME_PM_OPS(omap_usb2_runtime_suspend, omap_usb2_runtime_resume,
		NULL)
};

#define DEV_PM_OPS     (&omap_usb2_pm_ops)
#else
#define DEV_PM_OPS     NULL
#endif

#ifdef CONFIG_OF
static const struct of_device_id omap_usb2_id_table[] = {
	{ .compatible = "ti,omap-usb2" },
	{}
};
MODULE_DEVICE_TABLE(of, omap_usb2_id_table);
#endif

static struct platform_driver omap_usb2_driver = {
	.probe		= omap_usb2_probe,
	.remove		= omap_usb2_remove,
	.driver		= {
		.name	= "omap-usb2",
		.owner	= THIS_MODULE,
		.pm	= DEV_PM_OPS,
		.of_match_table = of_match_ptr(omap_usb2_id_table),
	},
};

module_platform_driver(omap_usb2_driver);

MODULE_ALIAS("platform: omap_usb2");
MODULE_AUTHOR("Texas Instruments Inc.");
MODULE_DESCRIPTION("OMAP USB2 phy driver");
MODULE_LICENSE("GPL v2");