1 #include <linux/module.h>
2 #include <linux/platform_device.h>
3 #include <linux/err.h>
4 #include <linux/of.h>
5 #include <linux/io.h>
6 
7 struct phy_control {
8 	void (*phy_power)(struct phy_control *phy_ctrl, u32 id, bool on);
9 	void (*phy_wkup)(struct phy_control *phy_ctrl, u32 id, bool on);
10 };
11 
12 struct am335x_control_usb {
13 	struct device *dev;
14 	void __iomem *phy_reg;
15 	void __iomem *wkup;
16 	spinlock_t lock;
17 	struct phy_control phy_ctrl;
18 };
19 
20 #define AM335X_USB0_CTRL		0x0
21 #define AM335X_USB1_CTRL		0x8
22 #define AM335x_USB_WKUP			0x0
23 
24 #define USBPHY_CM_PWRDN		(1 << 0)
25 #define USBPHY_OTG_PWRDN	(1 << 1)
26 #define USBPHY_OTGVDET_EN	(1 << 19)
27 #define USBPHY_OTGSESSEND_EN	(1 << 20)
28 
29 static void am335x_phy_power(struct phy_control *phy_ctrl, u32 id, bool on)
30 {
31 	struct am335x_control_usb *usb_ctrl;
32 	u32 val;
33 	u32 reg;
34 
35 	usb_ctrl = container_of(phy_ctrl, struct am335x_control_usb, phy_ctrl);
36 
37 	switch (id) {
38 	case 0:
39 		reg = AM335X_USB0_CTRL;
40 		break;
41 	case 1:
42 		reg = AM335X_USB1_CTRL;
43 		break;
44 	default:
45 		WARN_ON(1);
46 		return;
47 	}
48 
49 	val = readl(usb_ctrl->phy_reg + reg);
50 	if (on) {
51 		val &= ~(USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN);
52 		val |= USBPHY_OTGVDET_EN | USBPHY_OTGSESSEND_EN;
53 	} else {
54 		val |= USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN;
55 	}
56 
57 	writel(val, usb_ctrl->phy_reg + reg);
58 }
59 
60 static const struct phy_control ctrl_am335x = {
61 	.phy_power = am335x_phy_power,
62 };
63 
64 static const struct of_device_id omap_control_usb_id_table[] = {
65 	{ .compatible = "ti,am335x-usb-ctrl-module", .data = &ctrl_am335x },
66 	{}
67 };
68 MODULE_DEVICE_TABLE(of, omap_control_usb_id_table);
69 
70 static struct platform_driver am335x_control_driver;
71 static int match(struct device *dev, void *data)
72 {
73 	struct device_node *node = (struct device_node *)data;
74 	return dev->of_node == node &&
75 		dev->driver == &am335x_control_driver.driver;
76 }
77 
78 struct phy_control *am335x_get_phy_control(struct device *dev)
79 {
80 	struct device_node *node;
81 	struct am335x_control_usb *ctrl_usb;
82 
83 	node = of_parse_phandle(dev->of_node, "ti,ctrl_mod", 0);
84 	if (!node)
85 		return NULL;
86 
87 	dev = bus_find_device(&platform_bus_type, NULL, node, match);
88 	ctrl_usb = dev_get_drvdata(dev);
89 	if (!ctrl_usb)
90 		return NULL;
91 	return &ctrl_usb->phy_ctrl;
92 }
93 EXPORT_SYMBOL_GPL(am335x_get_phy_control);
94 
95 static int am335x_control_usb_probe(struct platform_device *pdev)
96 {
97 	struct resource	*res;
98 	struct am335x_control_usb *ctrl_usb;
99 	const struct of_device_id *of_id;
100 	const struct phy_control *phy_ctrl;
101 
102 	of_id = of_match_node(omap_control_usb_id_table, pdev->dev.of_node);
103 	if (!of_id)
104 		return -EINVAL;
105 
106 	phy_ctrl = of_id->data;
107 
108 	ctrl_usb = devm_kzalloc(&pdev->dev, sizeof(*ctrl_usb), GFP_KERNEL);
109 	if (!ctrl_usb) {
110 		dev_err(&pdev->dev, "unable to alloc memory for control usb\n");
111 		return -ENOMEM;
112 	}
113 
114 	ctrl_usb->dev = &pdev->dev;
115 
116 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy_ctrl");
117 	ctrl_usb->phy_reg = devm_ioremap_resource(&pdev->dev, res);
118 	if (IS_ERR(ctrl_usb->phy_reg))
119 		return PTR_ERR(ctrl_usb->phy_reg);
120 	spin_lock_init(&ctrl_usb->lock);
121 	ctrl_usb->phy_ctrl = *phy_ctrl;
122 
123 	dev_set_drvdata(ctrl_usb->dev, ctrl_usb);
124 	return 0;
125 }
126 
127 static struct platform_driver am335x_control_driver = {
128 	.probe		= am335x_control_usb_probe,
129 	.driver		= {
130 		.name	= "am335x-control-usb",
131 		.owner	= THIS_MODULE,
132 		.of_match_table = of_match_ptr(omap_control_usb_id_table),
133 	},
134 };
135 
136 module_platform_driver(am335x_control_driver);
137 MODULE_LICENSE("GPL v2");
138