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