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
9struct 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
29static 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
61static 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
100static const struct phy_control ctrl_am335x = {
101	.phy_power = am335x_phy_power,
102	.phy_wkup = am335x_phy_wkup,
103};
104
105static const struct of_device_id omap_control_usb_id_table[] = {
106	{ .compatible = "ti,am335x-usb-ctrl-module", .data = &ctrl_am335x },
107	{}
108};
109MODULE_DEVICE_TABLE(of, omap_control_usb_id_table);
110
111static struct platform_driver am335x_control_driver;
112static 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
119struct 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}
137EXPORT_SYMBOL_GPL(am335x_get_phy_control);
138
139static 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
175static 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
183module_platform_driver(am335x_control_driver);
184MODULE_LICENSE("GPL v2");
185