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
10struct 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
30static 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
62static 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
101
102
103
104 if (on)
105 mdelay(1);
106}
107
108static const struct phy_control ctrl_am335x = {
109 .phy_power = am335x_phy_power,
110 .phy_wkup = am335x_phy_wkup,
111};
112
113static const struct of_device_id omap_control_usb_id_table[] = {
114 { .compatible = "ti,am335x-usb-ctrl-module", .data = &ctrl_am335x },
115 {}
116};
117MODULE_DEVICE_TABLE(of, omap_control_usb_id_table);
118
119static struct platform_driver am335x_control_driver;
120static 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
127struct 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 of_node_put(node);
138 if (!dev)
139 return NULL;
140
141 ctrl_usb = dev_get_drvdata(dev);
142 put_device(dev);
143 if (!ctrl_usb)
144 return NULL;
145 return &ctrl_usb->phy_ctrl;
146}
147EXPORT_SYMBOL_GPL(am335x_get_phy_control);
148
149static int am335x_control_usb_probe(struct platform_device *pdev)
150{
151 struct resource *res;
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 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy_ctrl");
169 ctrl_usb->phy_reg = devm_ioremap_resource(&pdev->dev, res);
170 if (IS_ERR(ctrl_usb->phy_reg))
171 return PTR_ERR(ctrl_usb->phy_reg);
172
173 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "wakeup");
174 ctrl_usb->wkup = devm_ioremap_resource(&pdev->dev, res);
175 if (IS_ERR(ctrl_usb->wkup))
176 return PTR_ERR(ctrl_usb->wkup);
177
178 spin_lock_init(&ctrl_usb->lock);
179 ctrl_usb->phy_ctrl = *phy_ctrl;
180
181 dev_set_drvdata(ctrl_usb->dev, ctrl_usb);
182 return 0;
183}
184
185static struct platform_driver am335x_control_driver = {
186 .probe = am335x_control_usb_probe,
187 .driver = {
188 .name = "am335x-control-usb",
189 .of_match_table = omap_control_usb_id_table,
190 },
191};
192
193module_platform_driver(am335x_control_driver);
194MODULE_LICENSE("GPL v2");
195
