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
|
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/usb/otg.h>
#include <linux/usb/usb_phy_generic.h>
#include <linux/slab.h>
#include <linux/clk.h>
#include <linux/regulator/consumer.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include "am35x-phy-control.h"
#include "phy-generic.h"
struct am335x_phy {
struct usb_phy_generic usb_phy_gen;
struct phy_control *phy_ctrl;
int id;
};
static int am335x_init(struct usb_phy *phy)
{
struct am335x_phy *am_phy = dev_get_drvdata(phy->dev);
phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, true);
return 0;
}
static void am335x_shutdown(struct usb_phy *phy)
{
struct am335x_phy *am_phy = dev_get_drvdata(phy->dev);
phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, false);
}
static int am335x_phy_probe(struct platform_device *pdev)
{
struct am335x_phy *am_phy;
struct device *dev = &pdev->dev;
int ret;
am_phy = devm_kzalloc(dev, sizeof(*am_phy), GFP_KERNEL);
if (!am_phy)
return -ENOMEM;
am_phy->phy_ctrl = am335x_get_phy_control(dev);
if (!am_phy->phy_ctrl)
return -EPROBE_DEFER;
am_phy->id = of_alias_get_id(pdev->dev.of_node, "phy");
if (am_phy->id < 0) {
dev_err(&pdev->dev, "Missing PHY id: %d\n", am_phy->id);
return am_phy->id;
}
ret = usb_phy_gen_create_phy(dev, &am_phy->usb_phy_gen, NULL);
if (ret)
return ret;
ret = usb_add_phy_dev(&am_phy->usb_phy_gen.phy);
if (ret)
return ret;
am_phy->usb_phy_gen.phy.init = am335x_init;
am_phy->usb_phy_gen.phy.shutdown = am335x_shutdown;
platform_set_drvdata(pdev, am_phy);
device_init_wakeup(dev, true);
/*
* If we leave PHY wakeup enabled then AM33XX wakes up
* immediately from DS0. To avoid this we mark dev->power.can_wakeup
* to false. The same is checked in suspend routine to decide
* on whether to enable PHY wakeup or not.
* PHY wakeup works fine in standby mode, there by allowing us to
* handle remote wakeup, wakeup on disconnect and connect.
*/
device_set_wakeup_enable(dev, false);
phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, false);
return 0;
}
static int am335x_phy_remove(struct platform_device *pdev)
{
struct am335x_phy *am_phy = platform_get_drvdata(pdev);
usb_remove_phy(&am_phy->usb_phy_gen.phy);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int am335x_phy_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct am335x_phy *am_phy = platform_get_drvdata(pdev);
/*
* Enable phy wakeup only if dev->power.can_wakeup is true.
* Make sure to enable wakeup to support remote wakeup in
* standby mode ( same is not supported in OFF(DS0) mode).
* Enable it by doing
* echo enabled > /sys/bus/platform/devices/<usb-phy-id>/power/wakeup
*/
if (device_may_wakeup(dev))
phy_ctrl_wkup(am_phy->phy_ctrl, am_phy->id, true);
phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, false);
return 0;
}
static int am335x_phy_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct am335x_phy *am_phy = platform_get_drvdata(pdev);
phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, true);
if (device_may_wakeup(dev))
phy_ctrl_wkup(am_phy->phy_ctrl, am_phy->id, false);
return 0;
}
static const struct dev_pm_ops am335x_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(am335x_phy_suspend, am335x_phy_resume)
};
#define DEV_PM_OPS (&am335x_pm_ops)
#else
#define DEV_PM_OPS NULL
#endif
static const struct of_device_id am335x_phy_ids[] = {
{ .compatible = "ti,am335x-usb-phy" },
{ }
};
MODULE_DEVICE_TABLE(of, am335x_phy_ids);
static struct platform_driver am335x_phy_driver = {
.probe = am335x_phy_probe,
.remove = am335x_phy_remove,
.driver = {
.name = "am335x-phy-driver",
.owner = THIS_MODULE,
.pm = DEV_PM_OPS,
.of_match_table = am335x_phy_ids,
},
};
module_platform_driver(am335x_phy_driver);
MODULE_LICENSE("GPL v2");
|
