summaryrefslogtreecommitdiffstats
path: root/drivers/usb/phy/phy-am335x-control.c
blob: 634f49acd20e58154d02177c4e49781e51754c8d (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
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/err.h>
#include <linux/of.h>
#include <linux/io.h>

struct phy_control {
	void (*phy_power)(struct phy_control *phy_ctrl, u32 id, bool on);
	void (*phy_wkup)(struct phy_control *phy_ctrl, u32 id, bool on);
};

struct am335x_control_usb {
	struct device *dev;
	void __iomem *phy_reg;
	void __iomem *wkup;
	spinlock_t lock;
	struct phy_control phy_ctrl;
};

#define AM335X_USB0_CTRL		0x0
#define AM335X_USB1_CTRL		0x8
#define AM335x_USB_WKUP			0x0

#define USBPHY_CM_PWRDN		(1 << 0)
#define USBPHY_OTG_PWRDN	(1 << 1)
#define USBPHY_OTGVDET_EN	(1 << 19)
#define USBPHY_OTGSESSEND_EN	(1 << 20)

#define AM335X_PHY0_WK_EN	(1 << 0)
#define AM335X_PHY1_WK_EN	(1 << 8)

static void am335x_phy_wkup(struct  phy_control *phy_ctrl, u32 id, bool on)
{
	struct am335x_control_usb *usb_ctrl;
	u32 val;
	u32 reg;

	usb_ctrl = container_of(phy_ctrl, struct am335x_control_usb, phy_ctrl);

	switch (id) {
	case 0:
		reg = AM335X_PHY0_WK_EN;
		break;
	case 1:
		reg = AM335X_PHY1_WK_EN;
		break;
	default:
		WARN_ON(1);
		return;
	}

	spin_lock(&usb_ctrl->lock);
	val = readl(usb_ctrl->wkup);

	if (on)
		val |= reg;
	else
		val &= ~reg;

	writel(val, usb_ctrl->wkup);
	spin_unlock(&usb_ctrl->lock);
}

static void am335x_phy_power(struct phy_control *phy_ctrl, u32 id, bool on)
{
	struct am335x_control_usb *usb_ctrl;
	u32 val;
	u32 reg;

	usb_ctrl = container_of(phy_ctrl, struct am335x_control_usb, phy_ctrl);

	switch (id) {
	case 0:
		reg = AM335X_USB0_CTRL;
		break;
	case 1:
		reg = AM335X_USB1_CTRL;
		break;
	default:
		WARN_ON(1);
		return;
	}

	val = readl(usb_ctrl->phy_reg + reg);
	if (on) {
		val &= ~(USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN);
		val |= USBPHY_OTGVDET_EN | USBPHY_OTGSESSEND_EN;
	} else {
		val |= USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN;
	}

	writel(val, usb_ctrl->phy_reg + reg);
}

static const struct phy_control ctrl_am335x = {
	.phy_power = am335x_phy_power,
	.phy_wkup = am335x_phy_wkup,
};

static const struct of_device_id omap_control_usb_id_table[] = {
	{ .compatible = "ti,am335x-usb-ctrl-module", .data = &ctrl_am335x },
	{}
};
MODULE_DEVICE_TABLE(of, omap_control_usb_id_table);

static struct platform_driver am335x_control_driver;
static int match(struct device *dev, void *data)
{
	struct device_node *node = (struct device_node *)data;
	return dev->of_node == node &&
		dev->driver == &am335x_control_driver.driver;
}

struct phy_control *am335x_get_phy_control(struct device *dev)
{
	struct device_node *node;
	struct am335x_control_usb *ctrl_usb;

	node = of_parse_phandle(dev->of_node, "ti,ctrl_mod", 0);
	if (!node)
		return NULL;

	dev = bus_find_device(&platform_bus_type, NULL, node, match);
	ctrl_usb = dev_get_drvdata(dev);
	if (!ctrl_usb)
		return NULL;
	return &ctrl_usb->phy_ctrl;
}
EXPORT_SYMBOL_GPL(am335x_get_phy_control);

static int am335x_control_usb_probe(struct platform_device *pdev)
{
	struct resource	*res;
	struct am335x_control_usb *ctrl_usb;
	const struct of_device_id *of_id;
	const struct phy_control *phy_ctrl;

	of_id = of_match_node(omap_control_usb_id_table, pdev->dev.of_node);
	if (!of_id)
		return -EINVAL;

	phy_ctrl = of_id->data;

	ctrl_usb = devm_kzalloc(&pdev->dev, sizeof(*ctrl_usb), GFP_KERNEL);
	if (!ctrl_usb) {
		dev_err(&pdev->dev, "unable to alloc memory for control usb\n");
		return -ENOMEM;
	}

	ctrl_usb->dev = &pdev->dev;

	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy_ctrl");
	ctrl_usb->phy_reg = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(ctrl_usb->phy_reg))
		return PTR_ERR(ctrl_usb->phy_reg);

	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "wakeup");
	ctrl_usb->wkup = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(ctrl_usb->wkup))
		return PTR_ERR(ctrl_usb->wkup);

	spin_lock_init(&ctrl_usb->lock);
	ctrl_usb->phy_ctrl = *phy_ctrl;

	dev_set_drvdata(ctrl_usb->dev, ctrl_usb);
	return 0;
}

static struct platform_driver am335x_control_driver = {
	.probe		= am335x_control_usb_probe,
	.driver		= {
		.name	= "am335x-control-usb",
		.owner	= THIS_MODULE,
		.of_match_table = omap_control_usb_id_table,
	},
};

module_platform_driver(am335x_control_driver);
MODULE_LICENSE("GPL v2");