1 #include <linux/module.h>
2 #include <linux/platform_device.h>
6 #include <linux/delay.h>
7 #include "am35x-phy-control.h"
9 struct am335x_control_usb {
11 void __iomem *phy_reg;
14 struct phy_control phy_ctrl;
17 #define AM335X_USB0_CTRL 0x0
18 #define AM335X_USB1_CTRL 0x8
19 #define AM335x_USB_WKUP 0x0
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)
26 #define AM335X_PHY0_WK_EN (1 << 0)
27 #define AM335X_PHY1_WK_EN (1 << 8)
29 static void am335x_phy_wkup(struct phy_control *phy_ctrl, u32 id, bool on)
31 struct am335x_control_usb *usb_ctrl;
35 usb_ctrl = container_of(phy_ctrl, struct am335x_control_usb, phy_ctrl);
39 reg = AM335X_PHY0_WK_EN;
42 reg = AM335X_PHY1_WK_EN;
49 spin_lock(&usb_ctrl->lock);
50 val = readl(usb_ctrl->wkup);
57 writel(val, usb_ctrl->wkup);
58 spin_unlock(&usb_ctrl->lock);
61 static void am335x_phy_power(struct phy_control *phy_ctrl, u32 id, bool on)
63 struct am335x_control_usb *usb_ctrl;
67 usb_ctrl = container_of(phy_ctrl, struct am335x_control_usb, phy_ctrl);
71 reg = AM335X_USB0_CTRL;
74 reg = AM335X_USB1_CTRL;
81 val = readl(usb_ctrl->phy_reg + reg);
83 val &= ~(USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN);
84 val |= USBPHY_OTGVDET_EN | USBPHY_OTGSESSEND_EN;
86 val |= USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN;
89 writel(val, usb_ctrl->phy_reg + reg);
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.
100 static const struct phy_control ctrl_am335x = {
101 .phy_power = am335x_phy_power,
102 .phy_wkup = am335x_phy_wkup,
105 static const struct of_device_id omap_control_usb_id_table[] = {
106 { .compatible = "ti,am335x-usb-ctrl-module", .data = &ctrl_am335x },
109 MODULE_DEVICE_TABLE(of, omap_control_usb_id_table);
111 static struct platform_driver am335x_control_driver;
112 static int match(struct device *dev, void *data)
114 struct device_node *node = (struct device_node *)data;
115 return dev->of_node == node &&
116 dev->driver == &am335x_control_driver.driver;
119 struct phy_control *am335x_get_phy_control(struct device *dev)
121 struct device_node *node;
122 struct am335x_control_usb *ctrl_usb;
124 node = of_parse_phandle(dev->of_node, "ti,ctrl_mod", 0);
128 dev = bus_find_device(&platform_bus_type, NULL, node, match);
132 ctrl_usb = dev_get_drvdata(dev);
135 return &ctrl_usb->phy_ctrl;
137 EXPORT_SYMBOL_GPL(am335x_get_phy_control);
139 static int am335x_control_usb_probe(struct platform_device *pdev)
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;
146 of_id = of_match_node(omap_control_usb_id_table, pdev->dev.of_node);
150 phy_ctrl = of_id->data;
152 ctrl_usb = devm_kzalloc(&pdev->dev, sizeof(*ctrl_usb), GFP_KERNEL);
156 ctrl_usb->dev = &pdev->dev;
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);
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);
168 spin_lock_init(&ctrl_usb->lock);
169 ctrl_usb->phy_ctrl = *phy_ctrl;
171 dev_set_drvdata(ctrl_usb->dev, ctrl_usb);
175 static struct platform_driver am335x_control_driver = {
176 .probe = am335x_control_usb_probe,
178 .name = "am335x-control-usb",
179 .of_match_table = omap_control_usb_id_table,
183 module_platform_driver(am335x_control_driver);
184 MODULE_LICENSE("GPL v2");