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 #include <linux/delay.h>
7 #include "am35x-phy-control.h"
8 
9 struct am335x_control_usb {
10 	struct device *dev;
11 	void __iomem *phy_reg;
12 	void __iomem *wkup;
13 	spinlock_t lock;
14 	struct phy_control phy_ctrl;
15 };
16 
17 #define AM335X_USB0_CTRL		0x0
18 #define AM335X_USB1_CTRL		0x8
19 #define AM335x_USB_WKUP			0x0
20 
21 #define USBPHY_CM_PWRDN		(1 << 0)
22 #define USBPHY_OTG_PWRDN	(1 << 1)
23 #define USBPHY_OTGVDET_EN	(1 << 19)
24 #define USBPHY_OTGSESSEND_EN	(1 << 20)
25 
26 #define AM335X_PHY0_WK_EN	(1 << 0)
27 #define AM335X_PHY1_WK_EN	(1 << 8)
28 
29 static void am335x_phy_wkup(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_PHY0_WK_EN;
40 		break;
41 	case 1:
42 		reg = AM335X_PHY1_WK_EN;
43 		break;
44 	default:
45 		WARN_ON(1);
46 		return;
47 	}
48 
49 	spin_lock(&usb_ctrl->lock);
50 	val = readl(usb_ctrl->wkup);
51 
52 	if (on)
53 		val |= reg;
54 	else
55 		val &= ~reg;
56 
57 	writel(val, usb_ctrl->wkup);
58 	spin_unlock(&usb_ctrl->lock);
59 }
60 
61 static void am335x_phy_power(struct phy_control *phy_ctrl, u32 id, bool on)
62 {
63 	struct am335x_control_usb *usb_ctrl;
64 	u32 val;
65 	u32 reg;
66 
67 	usb_ctrl = container_of(phy_ctrl, struct am335x_control_usb, phy_ctrl);
68 
69 	switch (id) {
70 	case 0:
71 		reg = AM335X_USB0_CTRL;
72 		break;
73 	case 1:
74 		reg = AM335X_USB1_CTRL;
75 		break;
76 	default:
77 		WARN_ON(1);
78 		return;
79 	}
80 
81 	val = readl(usb_ctrl->phy_reg + reg);
82 	if (on) {
83 		val &= ~(USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN);
84 		val |= USBPHY_OTGVDET_EN | USBPHY_OTGSESSEND_EN;
85 	} else {
86 		val |= USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN;
87 	}
88 
89 	writel(val, usb_ctrl->phy_reg + reg);
90 
91 	/*
92 	 * Give the PHY ~1ms to complete the power up operation.
93 	 * Tests have shown unstable behaviour if other USB PHY related
94 	 * registers are written too shortly after such a transition.
95 	 */
96 	if (on)
97 		mdelay(1);
98 }
99 
100 static const struct phy_control ctrl_am335x = {
101 	.phy_power = am335x_phy_power,
102 	.phy_wkup = am335x_phy_wkup,
103 };
104 
105 static const struct of_device_id omap_control_usb_id_table[] = {
106 	{ .compatible = "ti,am335x-usb-ctrl-module", .data = &ctrl_am335x },
107 	{}
108 };
109 MODULE_DEVICE_TABLE(of, omap_control_usb_id_table);
110 
111 static struct platform_driver am335x_control_driver;
112 static int match(struct device *dev, void *data)
113 {
114 	struct device_node *node = (struct device_node *)data;
115 	return dev->of_node == node &&
116 		dev->driver == &am335x_control_driver.driver;
117 }
118 
119 struct phy_control *am335x_get_phy_control(struct device *dev)
120 {
121 	struct device_node *node;
122 	struct am335x_control_usb *ctrl_usb;
123 
124 	node = of_parse_phandle(dev->of_node, "ti,ctrl_mod", 0);
125 	if (!node)
126 		return NULL;
127 
128 	dev = bus_find_device(&platform_bus_type, NULL, node, match);
129 	if (!dev)
130 		return NULL;
131 
132 	ctrl_usb = dev_get_drvdata(dev);
133 	if (!ctrl_usb)
134 		return NULL;
135 	return &ctrl_usb->phy_ctrl;
136 }
137 EXPORT_SYMBOL_GPL(am335x_get_phy_control);
138 
139 static int am335x_control_usb_probe(struct platform_device *pdev)
140 {
141 	struct resource	*res;
142 	struct am335x_control_usb *ctrl_usb;
143 	const struct of_device_id *of_id;
144 	const struct phy_control *phy_ctrl;
145 
146 	of_id = of_match_node(omap_control_usb_id_table, pdev->dev.of_node);
147 	if (!of_id)
148 		return -EINVAL;
149 
150 	phy_ctrl = of_id->data;
151 
152 	ctrl_usb = devm_kzalloc(&pdev->dev, sizeof(*ctrl_usb), GFP_KERNEL);
153 	if (!ctrl_usb)
154 		return -ENOMEM;
155 
156 	ctrl_usb->dev = &pdev->dev;
157 
158 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy_ctrl");
159 	ctrl_usb->phy_reg = devm_ioremap_resource(&pdev->dev, res);
160 	if (IS_ERR(ctrl_usb->phy_reg))
161 		return PTR_ERR(ctrl_usb->phy_reg);
162 
163 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "wakeup");
164 	ctrl_usb->wkup = devm_ioremap_resource(&pdev->dev, res);
165 	if (IS_ERR(ctrl_usb->wkup))
166 		return PTR_ERR(ctrl_usb->wkup);
167 
168 	spin_lock_init(&ctrl_usb->lock);
169 	ctrl_usb->phy_ctrl = *phy_ctrl;
170 
171 	dev_set_drvdata(ctrl_usb->dev, ctrl_usb);
172 	return 0;
173 }
174 
175 static struct platform_driver am335x_control_driver = {
176 	.probe		= am335x_control_usb_probe,
177 	.driver		= {
178 		.name	= "am335x-control-usb",
179 		.of_match_table = omap_control_usb_id_table,
180 	},
181 };
182 
183 module_platform_driver(am335x_control_driver);
184 MODULE_LICENSE("GPL v2");
185