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
|
/*
* Copyright (c) 2013 Sascha Hauer <s.hauer@pengutronix.de>
*
* 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.
*
* 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 <common.h>
#include <init.h>
#include <io.h>
#include <of.h>
#include <errno.h>
#include <driver.h>
#include <malloc.h>
#include <linux/clk.h>
#include <linux/err.h>
#define SET 0x4
#define CLR 0x8
#define USBPHY_CTRL 0x30
#define USBPHY_CTRL_SFTRST (1 << 31)
#define USBPHY_CTRL_CLKGATE (1 << 30)
#define USBPHY_CTRL_ENUTMILEVEL3 (1 << 15)
#define USBPHY_CTRL_ENUTMILEVEL2 (1 << 14)
struct imx_usbphy {
void __iomem *base;
struct clk *clk;
};
static int imx_usbphy_enable(struct imx_usbphy *imxphy)
{
u32 val;
clk_enable(imxphy->clk);
/* reset usbphy */
writel(USBPHY_CTRL_SFTRST, imxphy->base + USBPHY_CTRL + SET);
udelay(10);
/* clr reset and clkgate */
writel(USBPHY_CTRL_SFTRST | USBPHY_CTRL_CLKGATE,
imxphy->base + USBPHY_CTRL + CLR);
/* clr all pwd bits => power up phy */
writel(0xffffffff, imxphy->base + CLR);
/* set utmilvl2/3 */
val = readl(imxphy->base + USBPHY_CTRL);
val |= USBPHY_CTRL_ENUTMILEVEL3 | USBPHY_CTRL_ENUTMILEVEL2;
writel(val, imxphy->base + USBPHY_CTRL + SET);
return 0;
}
static int imx_usbphy_probe(struct device_d *dev)
{
int ret;
struct imx_usbphy *imxphy;
imxphy = xzalloc(sizeof(*imxphy));
imxphy->base = dev_request_mem_region(dev, 0);
if (IS_ERR(imxphy->base)) {
ret = PTR_ERR(imxphy->base);
goto err_free;
}
imxphy->clk = clk_get(dev, NULL);
if (IS_ERR(imxphy->clk)) {
dev_err(dev, "could not get clk: %s\n", strerrorp(imxphy->clk));
goto err_clk;
}
imx_usbphy_enable(imxphy);
dev_dbg(dev, "phy enabled\n");
return 0;
err_clk:
err_free:
free(imxphy);
return ret;
};
static __maybe_unused struct of_device_id imx_usbphy_dt_ids[] = {
{
.compatible = "fsl,imx23-usbphy",
}, {
/* sentinel */
},
};
static struct driver_d imx_usbphy_driver = {
.name = "imx-usb-phy",
.probe = imx_usbphy_probe,
.of_compatible = DRV_OF_COMPAT(imx_usbphy_dt_ids),
};
static int imx_usbphy_init(void)
{
return platform_driver_register(&imx_usbphy_driver);
}
fs_initcall(imx_usbphy_init);
|
