summaryrefslogtreecommitdiffstats
path: root/drivers/usb/chipidea/usbmisc_imx6q.c
blob: 416e3fc58fd0608c0e74e8d4db05be8c74a301ce (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
/*
 * Copyright 2012 Freescale Semiconductor, Inc.
 *
 * 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/clk.h>
#include <linux/err.h>
#include <linux/io.h>

#include "ci13xxx_imx.h"

#define USB_DEV_MAX 4

#define BM_OVER_CUR_DIS		BIT(7)

struct imx6q_usbmisc {
	void __iomem *base;
	spinlock_t lock;
	struct clk *clk;
	struct usbmisc_usb_device usbdev[USB_DEV_MAX];
};

static struct imx6q_usbmisc *usbmisc;

static struct usbmisc_usb_device *get_usbdev(struct device *dev)
{
	int i, ret;

	for (i = 0; i < USB_DEV_MAX; i++) {
		if (usbmisc->usbdev[i].dev == dev)
			return &usbmisc->usbdev[i];
		else if (!usbmisc->usbdev[i].dev)
			break;
	}

	if (i >= USB_DEV_MAX)
		return ERR_PTR(-EBUSY);

	ret = usbmisc_get_init_data(dev, &usbmisc->usbdev[i]);
	if (ret)
		return ERR_PTR(ret);

	return &usbmisc->usbdev[i];
}

static int usbmisc_imx6q_init(struct device *dev)
{

	struct usbmisc_usb_device *usbdev;
	unsigned long flags;
	u32 reg;

	usbdev = get_usbdev(dev);
	if (IS_ERR(usbdev))
		return PTR_ERR(usbdev);

	if (usbdev->disable_oc) {
		spin_lock_irqsave(&usbmisc->lock, flags);
		reg = readl(usbmisc->base + usbdev->index * 4);
		writel(reg | BM_OVER_CUR_DIS,
			usbmisc->base + usbdev->index * 4);
		spin_unlock_irqrestore(&usbmisc->lock, flags);
	}

	return 0;
}

static const struct usbmisc_ops imx6q_usbmisc_ops = {
	.init = usbmisc_imx6q_init,
};

static const struct of_device_id usbmisc_imx6q_dt_ids[] = {
	{ .compatible = "fsl,imx6q-usbmisc"},
	{ /* sentinel */ }
};

static int __devinit usbmisc_imx6q_probe(struct platform_device *pdev)
{
	struct resource	*res;
	struct imx6q_usbmisc *data;
	int ret;

	if (usbmisc)
		return -EBUSY;

	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	spin_lock_init(&data->lock);

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	data->base = devm_request_and_ioremap(&pdev->dev, res);
	if (!data->base)
		return -EADDRNOTAVAIL;

	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,
			"clk_prepare_enable failed, err=%d\n", ret);
		return ret;
	}

	ret = usbmisc_set_ops(&imx6q_usbmisc_ops);
	if (ret) {
		clk_disable_unprepare(data->clk);
		return ret;
	}

	usbmisc = data;

	return 0;
}

static int __devexit usbmisc_imx6q_remove(struct platform_device *pdev)
{
	usbmisc_unset_ops(&imx6q_usbmisc_ops);
	clk_disable_unprepare(usbmisc->clk);
	return 0;
}

static struct platform_driver usbmisc_imx6q_driver = {
	.probe = usbmisc_imx6q_probe,
	.remove = __devexit_p(usbmisc_imx6q_remove),
	.driver = {
		.name = "usbmisc_imx6q",
		.owner = THIS_MODULE,
		.of_match_table = usbmisc_imx6q_dt_ids,
	 },
};

int __init usbmisc_imx6q_drv_init(void)
{
	return platform_driver_register(&usbmisc_imx6q_driver);
}
subsys_initcall(usbmisc_imx6q_drv_init);

void __exit usbmisc_imx6q_drv_exit(void)
{
	platform_driver_unregister(&usbmisc_imx6q_driver);
}
module_exit(usbmisc_imx6q_drv_exit);

MODULE_ALIAS("platform:usbmisc-imx6q");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("driver for imx6q usb non-core registers");
MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>");