138 lines
3.3 KiB
C
138 lines
3.3 KiB
C
#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/err.h>
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#include <linux/of.h>
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#include <linux/io.h>
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struct phy_control {
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void (*phy_power)(struct phy_control *phy_ctrl, u32 id, bool on);
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void (*phy_wkup)(struct phy_control *phy_ctrl, u32 id, bool on);
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};
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struct am335x_control_usb {
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struct device *dev;
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void __iomem *phy_reg;
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void __iomem *wkup;
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spinlock_t lock;
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struct phy_control phy_ctrl;
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};
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#define AM335X_USB0_CTRL 0x0
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#define AM335X_USB1_CTRL 0x8
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#define AM335x_USB_WKUP 0x0
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#define USBPHY_CM_PWRDN (1 << 0)
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#define USBPHY_OTG_PWRDN (1 << 1)
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#define USBPHY_OTGVDET_EN (1 << 19)
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#define USBPHY_OTGSESSEND_EN (1 << 20)
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static void am335x_phy_power(struct phy_control *phy_ctrl, u32 id, bool on)
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{
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struct am335x_control_usb *usb_ctrl;
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u32 val;
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u32 reg;
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usb_ctrl = container_of(phy_ctrl, struct am335x_control_usb, phy_ctrl);
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switch (id) {
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case 0:
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reg = AM335X_USB0_CTRL;
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break;
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case 1:
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reg = AM335X_USB1_CTRL;
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break;
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default:
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WARN_ON(1);
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return;
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}
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val = readl(usb_ctrl->phy_reg + reg);
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if (on) {
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val &= ~(USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN);
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val |= USBPHY_OTGVDET_EN | USBPHY_OTGSESSEND_EN;
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} else {
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val |= USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN;
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}
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writel(val, usb_ctrl->phy_reg + reg);
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}
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static const struct phy_control ctrl_am335x = {
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.phy_power = am335x_phy_power,
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};
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static const struct of_device_id omap_control_usb_id_table[] = {
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{ .compatible = "ti,am335x-usb-ctrl-module", .data = &ctrl_am335x },
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{}
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};
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MODULE_DEVICE_TABLE(of, omap_control_usb_id_table);
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static struct platform_driver am335x_control_driver;
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static int match(struct device *dev, void *data)
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{
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struct device_node *node = (struct device_node *)data;
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return dev->of_node == node &&
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dev->driver == &am335x_control_driver.driver;
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}
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struct phy_control *am335x_get_phy_control(struct device *dev)
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{
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struct device_node *node;
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struct am335x_control_usb *ctrl_usb;
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node = of_parse_phandle(dev->of_node, "ti,ctrl_mod", 0);
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if (!node)
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return NULL;
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dev = bus_find_device(&platform_bus_type, NULL, node, match);
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ctrl_usb = dev_get_drvdata(dev);
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if (!ctrl_usb)
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return NULL;
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return &ctrl_usb->phy_ctrl;
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}
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EXPORT_SYMBOL_GPL(am335x_get_phy_control);
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static int am335x_control_usb_probe(struct platform_device *pdev)
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{
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struct resource *res;
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struct am335x_control_usb *ctrl_usb;
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const struct of_device_id *of_id;
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const struct phy_control *phy_ctrl;
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of_id = of_match_node(omap_control_usb_id_table, pdev->dev.of_node);
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if (!of_id)
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return -EINVAL;
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phy_ctrl = of_id->data;
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ctrl_usb = devm_kzalloc(&pdev->dev, sizeof(*ctrl_usb), GFP_KERNEL);
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if (!ctrl_usb) {
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dev_err(&pdev->dev, "unable to alloc memory for control usb\n");
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return -ENOMEM;
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}
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ctrl_usb->dev = &pdev->dev;
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res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy_ctrl");
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ctrl_usb->phy_reg = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(ctrl_usb->phy_reg))
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return PTR_ERR(ctrl_usb->phy_reg);
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spin_lock_init(&ctrl_usb->lock);
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ctrl_usb->phy_ctrl = *phy_ctrl;
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dev_set_drvdata(ctrl_usb->dev, ctrl_usb);
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return 0;
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}
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static struct platform_driver am335x_control_driver = {
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.probe = am335x_control_usb_probe,
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.driver = {
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.name = "am335x-control-usb",
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.owner = THIS_MODULE,
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.of_match_table = of_match_ptr(omap_control_usb_id_table),
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},
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};
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module_platform_driver(am335x_control_driver);
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MODULE_LICENSE("GPL v2");
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