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
|
/*
* 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/kernel.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/usb/otg.h>
#include <linux/stmp_device.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/io.h>
#define DRIVER_NAME "mxs_phy"
#define HW_USBPHY_PWD 0x00
#define HW_USBPHY_CTRL 0x30
#define HW_USBPHY_CTRL_SET 0x34
#define HW_USBPHY_CTRL_CLR 0x38
#define BM_USBPHY_CTRL_SFTRST BIT(31)
#define BM_USBPHY_CTRL_CLKGATE BIT(30)
#define BM_USBPHY_CTRL_ENUTMILEVEL3 BIT(15)
#define BM_USBPHY_CTRL_ENUTMILEVEL2 BIT(14)
#define BM_USBPHY_CTRL_ENHOSTDISCONDETECT BIT(1)
struct mxs_phy {
struct usb_phy phy;
struct clk *clk;
};
#define to_mxs_phy(p) container_of((p), struct mxs_phy, phy)
static int mxs_phy_hw_init(struct mxs_phy *mxs_phy)
{
int ret;
void __iomem *base = mxs_phy->phy.io_priv;
ret = stmp_reset_block(base + HW_USBPHY_CTRL);
if (ret)
return ret;
/* Power up the PHY */
writel(0, base + HW_USBPHY_PWD);
/* enable FS/LS device */
writel(BM_USBPHY_CTRL_ENUTMILEVEL2 |
BM_USBPHY_CTRL_ENUTMILEVEL3,
base + HW_USBPHY_CTRL_SET);
return 0;
}
static int mxs_phy_init(struct usb_phy *phy)
{
struct mxs_phy *mxs_phy = to_mxs_phy(phy);
clk_prepare_enable(mxs_phy->clk);
return mxs_phy_hw_init(mxs_phy);
}
static void mxs_phy_shutdown(struct usb_phy *phy)
{
struct mxs_phy *mxs_phy = to_mxs_phy(phy);
writel(BM_USBPHY_CTRL_CLKGATE,
phy->io_priv + HW_USBPHY_CTRL_SET);
clk_disable_unprepare(mxs_phy->clk);
}
static int mxs_phy_suspend(struct usb_phy *x, int suspend)
{
struct mxs_phy *mxs_phy = to_mxs_phy(x);
if (suspend) {
writel(0xffffffff, x->io_priv + HW_USBPHY_PWD);
writel(BM_USBPHY_CTRL_CLKGATE,
x->io_priv + HW_USBPHY_CTRL_SET);
clk_disable_unprepare(mxs_phy->clk);
} else {
clk_prepare_enable(mxs_phy->clk);
writel(BM_USBPHY_CTRL_CLKGATE,
x->io_priv + HW_USBPHY_CTRL_CLR);
writel(0, x->io_priv + HW_USBPHY_PWD);
}
return 0;
}
static int mxs_phy_on_connect(struct usb_phy *phy,
enum usb_device_speed speed)
{
dev_dbg(phy->dev, "%s speed device has connected\n",
(speed == USB_SPEED_HIGH) ? "high" : "non-high");
if (speed == USB_SPEED_HIGH)
writel(BM_USBPHY_CTRL_ENHOSTDISCONDETECT,
phy->io_priv + HW_USBPHY_CTRL_SET);
return 0;
}
static int mxs_phy_on_disconnect(struct usb_phy *phy,
enum usb_device_speed speed)
{
dev_dbg(phy->dev, "%s speed device has disconnected\n",
(speed == USB_SPEED_HIGH) ? "high" : "non-high");
if (speed == USB_SPEED_HIGH)
writel(BM_USBPHY_CTRL_ENHOSTDISCONDETECT,
phy->io_priv + HW_USBPHY_CTRL_CLR);
return 0;
}
static int mxs_phy_probe(struct platform_device *pdev)
{
struct resource *res;
void __iomem *base;
struct clk *clk;
struct mxs_phy *mxs_phy;
int ret;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(base))
return PTR_ERR(base);
clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(clk)) {
dev_err(&pdev->dev,
"can't get the clock, err=%ld", PTR_ERR(clk));
return PTR_ERR(clk);
}
mxs_phy = devm_kzalloc(&pdev->dev, sizeof(*mxs_phy), GFP_KERNEL);
if (!mxs_phy) {
dev_err(&pdev->dev, "Failed to allocate USB PHY structure!\n");
return -ENOMEM;
}
mxs_phy->phy.io_priv = base;
mxs_phy->phy.dev = &pdev->dev;
mxs_phy->phy.label = DRIVER_NAME;
mxs_phy->phy.init = mxs_phy_init;
mxs_phy->phy.shutdown = mxs_phy_shutdown;
mxs_phy->phy.set_suspend = mxs_phy_suspend;
mxs_phy->phy.notify_connect = mxs_phy_on_connect;
mxs_phy->phy.notify_disconnect = mxs_phy_on_disconnect;
mxs_phy->phy.type = USB_PHY_TYPE_USB2;
ATOMIC_INIT_NOTIFIER_HEAD(&mxs_phy->phy.notifier);
mxs_phy->clk = clk;
platform_set_drvdata(pdev, mxs_phy);
ret = usb_add_phy_dev(&mxs_phy->phy);
if (ret)
return ret;
return 0;
}
static int mxs_phy_remove(struct platform_device *pdev)
{
struct mxs_phy *mxs_phy = platform_get_drvdata(pdev);
usb_remove_phy(&mxs_phy->phy);
return 0;
}
static const struct of_device_id mxs_phy_dt_ids[] = {
{ .compatible = "fsl,imx23-usbphy", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, mxs_phy_dt_ids);
static struct platform_driver mxs_phy_driver = {
.probe = mxs_phy_probe,
.remove = mxs_phy_remove,
.driver = {
.name = DRIVER_NAME,
.owner = THIS_MODULE,
.of_match_table = mxs_phy_dt_ids,
},
};
static int __init mxs_phy_module_init(void)
{
return platform_driver_register(&mxs_phy_driver);
}
postcore_initcall(mxs_phy_module_init);
static void __exit mxs_phy_module_exit(void)
{
platform_driver_unregister(&mxs_phy_driver);
}
module_exit(mxs_phy_module_exit);
MODULE_ALIAS("platform:mxs-usb-phy");
MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>");
MODULE_DESCRIPTION("Freescale MXS USB PHY driver");
MODULE_LICENSE("GPL");
|
