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
|
/*
* USB cluster support for Armada 375 platform.
*
* Copyright (C) 2014 Marvell
*
* Gregory CLEMENT <gregory.clement@free-electrons.com>
*
* This file is licensed under the terms of the GNU General Public
* License version 2 or later. This program is licensed "as is"
* without any warranty of any kind, whether express or implied.
*
* Armada 375 comes with an USB2 host and device controller and an
* USB3 controller. The USB cluster control register allows to manage
* common features of both USB controllers.
*/
#include <dt-bindings/phy/phy.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#define USB2_PHY_CONFIG_DISABLE BIT(0)
struct armada375_cluster_phy {
struct phy *phy;
void __iomem *reg;
bool use_usb3;
int phy_provided;
};
static int armada375_usb_phy_init(struct phy *phy)
{
struct armada375_cluster_phy *cluster_phy;
u32 reg;
cluster_phy = dev_get_drvdata(phy->dev.parent);
if (!cluster_phy)
return -ENODEV;
reg = readl(cluster_phy->reg);
if (cluster_phy->use_usb3)
reg |= USB2_PHY_CONFIG_DISABLE;
else
reg &= ~USB2_PHY_CONFIG_DISABLE;
writel(reg, cluster_phy->reg);
return 0;
}
static struct phy_ops armada375_usb_phy_ops = {
.init = armada375_usb_phy_init,
.owner = THIS_MODULE,
};
/*
* Only one controller can use this PHY. We shouldn't have the case
* when two controllers want to use this PHY. But if this case occurs
* then we provide a phy to the first one and return an error for the
* next one. This error has also to be an error returned by
* devm_phy_optional_get() so different from ENODEV for USB2. In the
* USB3 case it still optional and we use ENODEV.
*/
static struct phy *armada375_usb_phy_xlate(struct device *dev,
struct of_phandle_args *args)
{
struct armada375_cluster_phy *cluster_phy = dev_get_drvdata(dev);
if (!cluster_phy)
return ERR_PTR(-ENODEV);
/*
* Either the phy had never been requested and then the first
* usb claiming it can get it, or it had already been
* requested in this case, we only allow to use it with the
* same configuration.
*/
if (WARN_ON((cluster_phy->phy_provided != PHY_NONE) &&
(cluster_phy->phy_provided != args->args[0]))) {
dev_err(dev, "This PHY has already been provided!\n");
dev_err(dev, "Check your device tree, only one controller can use it\n.");
if (args->args[0] == PHY_TYPE_USB2)
return ERR_PTR(-EBUSY);
else
return ERR_PTR(-ENODEV);
}
if (args->args[0] == PHY_TYPE_USB2)
cluster_phy->use_usb3 = false;
else if (args->args[0] == PHY_TYPE_USB3)
cluster_phy->use_usb3 = true;
else {
dev_err(dev, "Invalid PHY mode\n");
return ERR_PTR(-ENODEV);
}
/* Store which phy mode is used for next test */
cluster_phy->phy_provided = args->args[0];
return cluster_phy->phy;
}
static int armada375_usb_phy_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct phy *phy;
struct phy_provider *phy_provider;
void __iomem *usb_cluster_base;
struct resource *res;
struct armada375_cluster_phy *cluster_phy;
cluster_phy = devm_kzalloc(dev, sizeof(*cluster_phy), GFP_KERNEL);
if (!cluster_phy)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
usb_cluster_base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(usb_cluster_base))
return PTR_ERR(usb_cluster_base);
phy = devm_phy_create(dev, NULL, &armada375_usb_phy_ops);
if (IS_ERR(phy)) {
dev_err(dev, "failed to create PHY\n");
return PTR_ERR(phy);
}
cluster_phy->phy = phy;
cluster_phy->reg = usb_cluster_base;
dev_set_drvdata(dev, cluster_phy);
phy_provider = devm_of_phy_provider_register(&pdev->dev,
armada375_usb_phy_xlate);
return PTR_ERR_OR_ZERO(phy_provider);
}
static const struct of_device_id of_usb_cluster_table[] = {
{ .compatible = "marvell,armada-375-usb-cluster", },
{ /* end of list */ },
};
MODULE_DEVICE_TABLE(of, of_usb_cluster_table);
static struct platform_driver armada375_usb_phy_driver = {
.probe = armada375_usb_phy_probe,
.driver = {
.of_match_table = of_usb_cluster_table,
.name = "armada-375-usb-cluster",
.owner = THIS_MODULE,
}
};
module_platform_driver(armada375_usb_phy_driver);
MODULE_DESCRIPTION("Armada 375 USB cluster driver");
MODULE_AUTHOR("Gregory CLEMENT <gregory.clement@free-electrons.com>");
MODULE_LICENSE("GPL");
|
