summaryrefslogtreecommitdiffstats
path: root/drivers/usb/chipidea/ci13xxx_imx.c
blob: 8c291220be7f9ffd1117eb0fe0bd0cc7b6df4a5b (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
/*
 * Copyright 2012 Freescale Semiconductor, Inc.
 * Copyright (C) 2012 Marek Vasut <marex@denx.de>
 * on behalf of DENX Software Engineering GmbH
 *
 * The code contained herein is licensed under the GNU General Public
 * License. You may obtain a copy of the GNU General Public License
 * Version 2 or later at the following locations:
 *
 * http://www.opensource.org/licenses/gpl-license.html
 * http://www.gnu.org/copyleft/gpl.html
 */

#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/of_gpio.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/dma-mapping.h>
#include <linux/usb/chipidea.h>
#include <linux/clk.h>
#include <linux/regulator/consumer.h>
#include <linux/pinctrl/consumer.h>

#include "ci.h"
#include "ci13xxx_imx.h"

#define pdev_to_phy(pdev) \
	((struct usb_phy *)platform_get_drvdata(pdev))

struct ci13xxx_imx_data {
	struct device_node *phy_np;
	struct usb_phy *phy;
	struct platform_device *ci_pdev;
	struct clk *clk;
	struct regulator *reg_vbus;
};

static const struct usbmisc_ops *usbmisc_ops;

/* Common functions shared by usbmisc drivers */

int usbmisc_set_ops(const struct usbmisc_ops *ops)
{
	if (usbmisc_ops)
		return -EBUSY;

	usbmisc_ops = ops;

	return 0;
}
EXPORT_SYMBOL_GPL(usbmisc_set_ops);

void usbmisc_unset_ops(const struct usbmisc_ops *ops)
{
	usbmisc_ops = NULL;
}
EXPORT_SYMBOL_GPL(usbmisc_unset_ops);

int usbmisc_get_init_data(struct device *dev, struct usbmisc_usb_device *usbdev)
{
	struct device_node *np = dev->of_node;
	struct of_phandle_args args;
	int ret;

	usbdev->dev = dev;

	ret = of_parse_phandle_with_args(np, "fsl,usbmisc", "#index-cells",
					0, &args);
	if (ret) {
		dev_err(dev, "Failed to parse property fsl,usbmisc, errno %d\n",
			ret);
		memset(usbdev, 0, sizeof(*usbdev));
		return ret;
	}
	usbdev->index = args.args[0];
	of_node_put(args.np);

	if (of_find_property(np, "disable-over-current", NULL))
		usbdev->disable_oc = 1;

	return 0;
}
EXPORT_SYMBOL_GPL(usbmisc_get_init_data);

/* End of common functions shared by usbmisc drivers*/

static struct ci13xxx_platform_data ci13xxx_imx_platdata  = {
	.name			= "ci13xxx_imx",
	.flags			= CI13XXX_REQUIRE_TRANSCEIVER |
				  CI13XXX_PULLUP_ON_VBUS |
				  CI13XXX_DISABLE_STREAMING,
	.capoffset		= DEF_CAPOFFSET,
};

static int ci13xxx_imx_probe(struct platform_device *pdev)
{
	struct ci13xxx_imx_data *data;
	struct platform_device *plat_ci, *phy_pdev;
	struct device_node *phy_np;
	struct resource *res;
	struct regulator *reg_vbus;
	struct pinctrl *pinctrl;
	int ret;

	if (of_find_property(pdev->dev.of_node, "fsl,usbmisc", NULL)
		&& !usbmisc_ops)
		return -EPROBE_DEFER;

	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
	if (!data) {
		dev_err(&pdev->dev, "Failed to allocate CI13xxx-IMX data!\n");
		return -ENOMEM;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		dev_err(&pdev->dev, "Can't get device resources!\n");
		return -ENOENT;
	}

	pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
	if (IS_ERR(pinctrl))
		dev_warn(&pdev->dev, "pinctrl get/select failed, err=%ld\n",
			PTR_ERR(pinctrl));

	data->clk = devm_clk_get(&pdev->dev, NULL);
	if (IS_ERR(data->clk)) {
		dev_err(&pdev->dev,
			"Failed to get clock, err=%ld\n", PTR_ERR(data->clk));
		return PTR_ERR(data->clk);
	}

	ret = clk_prepare_enable(data->clk);
	if (ret) {
		dev_err(&pdev->dev,
			"Failed to prepare or enable clock, err=%d\n", ret);
		return ret;
	}

	phy_np = of_parse_phandle(pdev->dev.of_node, "fsl,usbphy", 0);
	if (phy_np) {
		data->phy_np = phy_np;
		phy_pdev = of_find_device_by_node(phy_np);
		if (phy_pdev) {
			struct usb_phy *phy;
			phy = pdev_to_phy(phy_pdev);
			if (phy &&
			    try_module_get(phy_pdev->dev.driver->owner)) {
				usb_phy_init(phy);
				data->phy = phy;
			}
		}
	}

	/* we only support host now, so enable vbus here */
	reg_vbus = devm_regulator_get(&pdev->dev, "vbus");
	if (!IS_ERR(reg_vbus)) {
		ret = regulator_enable(reg_vbus);
		if (ret) {
			dev_err(&pdev->dev,
				"Failed to enable vbus regulator, err=%d\n",
				ret);
			goto put_np;
		}
		data->reg_vbus = reg_vbus;
	} else {
		reg_vbus = NULL;
	}

	ci13xxx_imx_platdata.phy = data->phy;

	if (!pdev->dev.dma_mask) {
		pdev->dev.dma_mask = devm_kzalloc(&pdev->dev,
				      sizeof(*pdev->dev.dma_mask), GFP_KERNEL);
		if (!pdev->dev.dma_mask) {
			ret = -ENOMEM;
			dev_err(&pdev->dev, "Failed to alloc dma_mask!\n");
			goto err;
		}
		*pdev->dev.dma_mask = DMA_BIT_MASK(32);
		dma_set_coherent_mask(&pdev->dev, *pdev->dev.dma_mask);
	}

	if (usbmisc_ops && usbmisc_ops->init) {
		ret = usbmisc_ops->init(&pdev->dev);
		if (ret) {
			dev_err(&pdev->dev,
				"usbmisc init failed, ret=%d\n", ret);
			goto err;
		}
	}

	plat_ci = ci13xxx_add_device(&pdev->dev,
				pdev->resource, pdev->num_resources,
				&ci13xxx_imx_platdata);
	if (IS_ERR(plat_ci)) {
		ret = PTR_ERR(plat_ci);
		dev_err(&pdev->dev,
			"Can't register ci_hdrc platform device, err=%d\n",
			ret);
		goto err;
	}

	data->ci_pdev = plat_ci;
	platform_set_drvdata(pdev, data);

	pm_runtime_no_callbacks(&pdev->dev);
	pm_runtime_enable(&pdev->dev);

	return 0;

err:
	if (reg_vbus)
		regulator_disable(reg_vbus);
put_np:
	if (phy_np)
		of_node_put(phy_np);
	clk_disable_unprepare(data->clk);
	return ret;
}

static int ci13xxx_imx_remove(struct platform_device *pdev)
{
	struct ci13xxx_imx_data *data = platform_get_drvdata(pdev);

	pm_runtime_disable(&pdev->dev);
	ci13xxx_remove_device(data->ci_pdev);

	if (data->reg_vbus)
		regulator_disable(data->reg_vbus);

	if (data->phy) {
		usb_phy_shutdown(data->phy);
		module_put(data->phy->dev->driver->owner);
	}

	of_node_put(data->phy_np);

	clk_disable_unprepare(data->clk);

	platform_set_drvdata(pdev, NULL);

	return 0;
}

static const struct of_device_id ci13xxx_imx_dt_ids[] = {
	{ .compatible = "fsl,imx27-usb", },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, ci13xxx_imx_dt_ids);

static struct platform_driver ci13xxx_imx_driver = {
	.probe = ci13xxx_imx_probe,
	.remove = ci13xxx_imx_remove,
	.driver = {
		.name = "imx_usb",
		.owner = THIS_MODULE,
		.of_match_table = ci13xxx_imx_dt_ids,
	 },
};

module_platform_driver(ci13xxx_imx_driver);

MODULE_ALIAS("platform:imx-usb");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("CI13xxx i.MX USB binding");
MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>");