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 <linux/usb/otg.h>
8 #include "phy-am335x-control.h"
9 
10 struct am335x_control_usb {
11 	struct device *dev;
12 	void __iomem *phy_reg;
13 	void __iomem *wkup;
14 	spinlock_t lock;
15 	struct phy_control phy_ctrl;
16 };
17 
18 #define AM335X_USB0_CTRL		0x0
19 #define AM335X_USB1_CTRL		0x8
20 #define AM335x_USB_WKUP			0x0
21 
22 #define USBPHY_CM_PWRDN		(1 << 0)
23 #define USBPHY_OTG_PWRDN	(1 << 1)
24 #define USBPHY_OTGVDET_EN	(1 << 19)
25 #define USBPHY_OTGSESSEND_EN	(1 << 20)
26 
27 #define AM335X_PHY0_WK_EN	(1 << 0)
28 #define AM335X_PHY1_WK_EN	(1 << 8)
29 
30 static void am335x_phy_wkup(struct  phy_control *phy_ctrl, u32 id, bool on)
31 {
32 	struct am335x_control_usb *usb_ctrl;
33 	u32 val;
34 	u32 reg;
35 
36 	usb_ctrl = container_of(phy_ctrl, struct am335x_control_usb, phy_ctrl);
37 
38 	switch (id) {
39 	case 0:
40 		reg = AM335X_PHY0_WK_EN;
41 		break;
42 	case 1:
43 		reg = AM335X_PHY1_WK_EN;
44 		break;
45 	default:
46 		WARN_ON(1);
47 		return;
48 	}
49 
50 	spin_lock(&usb_ctrl->lock);
51 	val = readl(usb_ctrl->wkup);
52 
53 	if (on)
54 		val |= reg;
55 	else
56 		val &= ~reg;
57 
58 	writel(val, usb_ctrl->wkup);
59 	spin_unlock(&usb_ctrl->lock);
60 }
61 
62 static void am335x_phy_power(struct phy_control *phy_ctrl, u32 id,
63 				enum usb_dr_mode dr_mode, bool on)
64 {
65 	struct am335x_control_usb *usb_ctrl;
66 	u32 val;
67 	u32 reg;
68 
69 	usb_ctrl = container_of(phy_ctrl, struct am335x_control_usb, phy_ctrl);
70 
71 	switch (id) {
72 	case 0:
73 		reg = AM335X_USB0_CTRL;
74 		break;
75 	case 1:
76 		reg = AM335X_USB1_CTRL;
77 		break;
78 	default:
79 		WARN_ON(1);
80 		return;
81 	}
82 
83 	val = readl(usb_ctrl->phy_reg + reg);
84 	if (on) {
85 		if (dr_mode == USB_DR_MODE_HOST) {
86 			val &= ~(USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN |
87 					USBPHY_OTGVDET_EN);
88 			val |= USBPHY_OTGSESSEND_EN;
89 		} else {
90 			val &= ~(USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN);
91 			val |= USBPHY_OTGVDET_EN | USBPHY_OTGSESSEND_EN;
92 		}
93 	} else {
94 		val |= USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN;
95 	}
96 
97 	writel(val, usb_ctrl->phy_reg + reg);
98 
99 	/*
100 	 * Give the PHY ~1ms to complete the power up operation.
101 	 * Tests have shown unstable behaviour if other USB PHY related
102 	 * registers are written too shortly after such a transition.
103 	 */
104 	if (on)
105 		mdelay(1);
106 }
107 
108 static const struct phy_control ctrl_am335x = {
109 	.phy_power = am335x_phy_power,
110 	.phy_wkup = am335x_phy_wkup,
111 };
112 
113 static const struct of_device_id omap_control_usb_id_table[] = {
114 	{ .compatible = "ti,am335x-usb-ctrl-module", .data = &ctrl_am335x },
115 	{}
116 };
117 MODULE_DEVICE_TABLE(of, omap_control_usb_id_table);
118 
119 static struct platform_driver am335x_control_driver;
120 static int match(struct device *dev, void *data)
121 {
122 	struct device_node *node = (struct device_node *)data;
123 	return dev->of_node == node &&
124 		dev->driver == &am335x_control_driver.driver;
125 }
126 
127 struct phy_control *am335x_get_phy_control(struct device *dev)
128 {
129 	struct device_node *node;
130 	struct am335x_control_usb *ctrl_usb;
131 
132 	node = of_parse_phandle(dev->of_node, "ti,ctrl_mod", 0);
133 	if (!node)
134 		return NULL;
135 
136 	dev = bus_find_device(&platform_bus_type, NULL, node, match);
137 	if (!dev)
138 		return NULL;
139 
140 	ctrl_usb = dev_get_drvdata(dev);
141 	if (!ctrl_usb)
142 		return NULL;
143 	return &ctrl_usb->phy_ctrl;
144 }
145 EXPORT_SYMBOL_GPL(am335x_get_phy_control);
146 
147 static int am335x_control_usb_probe(struct platform_device *pdev)
148 {
149 	struct resource	*res;
150 	struct am335x_control_usb *ctrl_usb;
151 	const struct of_device_id *of_id;
152 	const struct phy_control *phy_ctrl;
153 
154 	of_id = of_match_node(omap_control_usb_id_table, pdev->dev.of_node);
155 	if (!of_id)
156 		return -EINVAL;
157 
158 	phy_ctrl = of_id->data;
159 
160 	ctrl_usb = devm_kzalloc(&pdev->dev, sizeof(*ctrl_usb), GFP_KERNEL);
161 	if (!ctrl_usb)
162 		return -ENOMEM;
163 
164 	ctrl_usb->dev = &pdev->dev;
165 
166 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy_ctrl");
167 	ctrl_usb->phy_reg = devm_ioremap_resource(&pdev->dev, res);
168 	if (IS_ERR(ctrl_usb->phy_reg))
169 		return PTR_ERR(ctrl_usb->phy_reg);
170 
171 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "wakeup");
172 	ctrl_usb->wkup = devm_ioremap_resource(&pdev->dev, res);
173 	if (IS_ERR(ctrl_usb->wkup))
174 		return PTR_ERR(ctrl_usb->wkup);
175 
176 	spin_lock_init(&ctrl_usb->lock);
177 	ctrl_usb->phy_ctrl = *phy_ctrl;
178 
179 	dev_set_drvdata(ctrl_usb->dev, ctrl_usb);
180 	return 0;
181 }
182 
183 static struct platform_driver am335x_control_driver = {
184 	.probe		= am335x_control_usb_probe,
185 	.driver		= {
186 		.name	= "am335x-control-usb",
187 		.of_match_table = omap_control_usb_id_table,
188 	},
189 };
190 
191 module_platform_driver(am335x_control_driver);
192 MODULE_LICENSE("GPL v2");
193