summaryrefslogtreecommitdiffstats
path: root/drivers/usb/phy/omap-control-usb.c
blob: 5323b71c3521f4ebe41ad74260787103e6933ce5 (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
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
/*
 * omap-control-usb.c - The USB part of control module.
 *
 * Copyright (C) 2013 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/err.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/usb/omap_control_usb.h>

static struct omap_control_usb *control_usb;

/**
 * omap_get_control_dev - returns the device pointer for this control device
 *
 * This API should be called to get the device pointer for this control
 * module device. This device pointer should be used for called other
 * exported API's in this driver.
 *
 * To be used by PHY driver and glue driver.
 */
struct device *omap_get_control_dev(void)
{
	if (!control_usb)
		return ERR_PTR(-ENODEV);

	return control_usb->dev;
}
EXPORT_SYMBOL_GPL(omap_get_control_dev);

/**
 * omap_control_usb3_phy_power - power on/off the serializer using control
 *	module
 * @dev: the control module device
 * @on: 0 to off and 1 to on based on powering on or off the PHY
 *
 * usb3 PHY driver should call this API to power on or off the PHY.
 */
void omap_control_usb3_phy_power(struct device *dev, bool on)
{
	u32 val;
	unsigned long rate;
	struct omap_control_usb	*control_usb = dev_get_drvdata(dev);

	if (control_usb->type != OMAP_CTRL_DEV_TYPE2)
		return;

	rate = clk_get_rate(control_usb->sys_clk);
	rate = rate/1000000;

	val = readl(control_usb->phy_power);

	if (on) {
		val &= ~(OMAP_CTRL_USB_PWRCTL_CLK_CMD_MASK |
			OMAP_CTRL_USB_PWRCTL_CLK_FREQ_MASK);
		val |= OMAP_CTRL_USB3_PHY_TX_RX_POWERON <<
			OMAP_CTRL_USB_PWRCTL_CLK_CMD_SHIFT;
		val |= rate << OMAP_CTRL_USB_PWRCTL_CLK_FREQ_SHIFT;
	} else {
		val &= ~OMAP_CTRL_USB_PWRCTL_CLK_CMD_MASK;
		val |= OMAP_CTRL_USB3_PHY_TX_RX_POWEROFF <<
			OMAP_CTRL_USB_PWRCTL_CLK_CMD_SHIFT;
	}

	writel(val, control_usb->phy_power);
}
EXPORT_SYMBOL_GPL(omap_control_usb3_phy_power);

/**
 * omap_control_usb_phy_power - power on/off the phy using control module reg
 * @dev: the control module device
 * @on: 0 or 1, based on powering on or off the PHY
 */
void omap_control_usb_phy_power(struct device *dev, int on)
{
	u32 val;
	struct omap_control_usb	*control_usb = dev_get_drvdata(dev);

	val = readl(control_usb->dev_conf);

	if (on)
		val &= ~OMAP_CTRL_DEV_PHY_PD;
	else
		val |= OMAP_CTRL_DEV_PHY_PD;

	writel(val, control_usb->dev_conf);
}
EXPORT_SYMBOL_GPL(omap_control_usb_phy_power);

/**
 * omap_control_usb_host_mode - set AVALID, VBUSVALID and ID pin in grounded
 * @ctrl_usb: struct omap_control_usb *
 *
 * Writes to the mailbox register to notify the usb core that a usb
 * device has been connected.
 */
static void omap_control_usb_host_mode(struct omap_control_usb *ctrl_usb)
{
	u32 val;

	val = readl(ctrl_usb->otghs_control);
	val &= ~(OMAP_CTRL_DEV_IDDIG | OMAP_CTRL_DEV_SESSEND);
	val |= OMAP_CTRL_DEV_AVALID | OMAP_CTRL_DEV_VBUSVALID;
	writel(val, ctrl_usb->otghs_control);
}

/**
 * omap_control_usb_device_mode - set AVALID, VBUSVALID and ID pin in high
 * impedance
 * @ctrl_usb: struct omap_control_usb *
 *
 * Writes to the mailbox register to notify the usb core that it has been
 * connected to a usb host.
 */
static void omap_control_usb_device_mode(struct omap_control_usb *ctrl_usb)
{
	u32 val;

	val = readl(ctrl_usb->otghs_control);
	val &= ~OMAP_CTRL_DEV_SESSEND;
	val |= OMAP_CTRL_DEV_IDDIG | OMAP_CTRL_DEV_AVALID |
		OMAP_CTRL_DEV_VBUSVALID;
	writel(val, ctrl_usb->otghs_control);
}

/**
 * omap_control_usb_set_sessionend - Enable SESSIONEND and IDIG to high
 * impedance
 * @ctrl_usb: struct omap_control_usb *
 *
 * Writes to the mailbox register to notify the usb core it's now in
 * disconnected state.
 */
static void omap_control_usb_set_sessionend(struct omap_control_usb *ctrl_usb)
{
	u32 val;

	val = readl(ctrl_usb->otghs_control);
	val &= ~(OMAP_CTRL_DEV_AVALID | OMAP_CTRL_DEV_VBUSVALID);
	val |= OMAP_CTRL_DEV_IDDIG | OMAP_CTRL_DEV_SESSEND;
	writel(val, ctrl_usb->otghs_control);
}

/**
 * omap_control_usb_set_mode - Calls to functions to set USB in one of host mode
 * or device mode or to denote disconnected state
 * @dev: the control module device
 * @mode: The mode to which usb should be configured
 *
 * This is an API to write to the mailbox register to notify the usb core that
 * a usb device has been connected.
 */
void omap_control_usb_set_mode(struct device *dev,
	enum omap_control_usb_mode mode)
{
	struct omap_control_usb	*ctrl_usb;

	if (IS_ERR(dev) || control_usb->type != OMAP_CTRL_DEV_TYPE1)
		return;

	ctrl_usb = dev_get_drvdata(dev);

	switch (mode) {
	case USB_MODE_HOST:
		omap_control_usb_host_mode(ctrl_usb);
		break;
	case USB_MODE_DEVICE:
		omap_control_usb_device_mode(ctrl_usb);
		break;
	case USB_MODE_DISCONNECT:
		omap_control_usb_set_sessionend(ctrl_usb);
		break;
	default:
		dev_vdbg(dev, "invalid omap control usb mode\n");
	}
}
EXPORT_SYMBOL_GPL(omap_control_usb_set_mode);

static int omap_control_usb_probe(struct platform_device *pdev)
{
	struct resource	*res;
	struct device_node *np = pdev->dev.of_node;
	struct omap_control_usb_platform_data *pdata = pdev->dev.platform_data;

	control_usb = devm_kzalloc(&pdev->dev, sizeof(*control_usb),
		GFP_KERNEL);
	if (!control_usb) {
		dev_err(&pdev->dev, "unable to alloc memory for control usb\n");
		return -ENOMEM;
	}

	if (np) {
		of_property_read_u32(np, "ti,type", &control_usb->type);
	} else if (pdata) {
		control_usb->type = pdata->type;
	} else {
		dev_err(&pdev->dev, "no pdata present\n");
		return -EINVAL;
	}

	control_usb->dev	= &pdev->dev;

	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
		"control_dev_conf");
	control_usb->dev_conf = devm_request_and_ioremap(&pdev->dev, res);
	if (!control_usb->dev_conf) {
		dev_err(&pdev->dev, "Failed to obtain io memory\n");
		return -EADDRNOTAVAIL;
	}

	if (control_usb->type == OMAP_CTRL_DEV_TYPE1) {
		res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
			"otghs_control");
		control_usb->otghs_control = devm_request_and_ioremap(
			&pdev->dev, res);
		if (!control_usb->otghs_control) {
			dev_err(&pdev->dev, "Failed to obtain io memory\n");
			return -EADDRNOTAVAIL;
		}
	}

	if (control_usb->type == OMAP_CTRL_DEV_TYPE2) {
		res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
			"phy_power_usb");
		control_usb->phy_power = devm_request_and_ioremap(
			&pdev->dev, res);
		if (!control_usb->phy_power) {
			dev_dbg(&pdev->dev, "Failed to obtain io memory\n");
			return -EADDRNOTAVAIL;
		}

		control_usb->sys_clk = devm_clk_get(control_usb->dev,
			"sys_clkin");
		if (IS_ERR(control_usb->sys_clk)) {
			pr_err("%s: unable to get sys_clkin\n", __func__);
			return -EINVAL;
		}
	}


	dev_set_drvdata(control_usb->dev, control_usb);

	return 0;
}

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

static struct platform_driver omap_control_usb_driver = {
	.probe		= omap_control_usb_probe,
	.driver		= {
		.name	= "omap-control-usb",
		.owner	= THIS_MODULE,
		.of_match_table = of_match_ptr(omap_control_usb_id_table),
	},
};

static int __init omap_control_usb_init(void)
{
	return platform_driver_register(&omap_control_usb_driver);
}
subsys_initcall(omap_control_usb_init);

static void __exit omap_control_usb_exit(void)
{
	platform_driver_unregister(&omap_control_usb_driver);
}
module_exit(omap_control_usb_exit);

MODULE_ALIAS("platform: omap_control_usb");
MODULE_AUTHOR("Texas Instruments Inc.");
MODULE_DESCRIPTION("OMAP Control Module USB Driver");
MODULE_LICENSE("GPL v2");
OpenPOWER on IntegriCloud