drivers/usb/phy/phy-am335x-control.c

   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
   7 struct phy_control {
   8         void (*phy_power)(struct phy_control *phy_ctrl, u32 id, bool on);
   9         void (*phy_wkup)(struct phy_control *phy_ctrl, u32 id, bool on);
  10 };
  11
  12 struct am335x_control_usb {
  13         struct device *dev;
  14         void __iomem *phy_reg;
  15         void __iomem *wkup;
  16         spinlock_t lock;
  17         struct phy_control phy_ctrl;
  18 };
  19
  20 #define AM335X_USB0_CTRL                0x0
  21 #define AM335X_USB1_CTRL                0x8
  22 #define AM335x_USB_WKUP                 0x0
  23
  24 #define USBPHY_CM_PWRDN         (1 << 0)
  25 #define USBPHY_OTG_PWRDN        (1 << 1)
  26 #define USBPHY_OTGVDET_EN       (1 << 19)
  27 #define USBPHY_OTGSESSEND_EN    (1 << 20)
  28
  29 static void am335x_phy_power(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_USB0_CTRL;
  40                 break;
  41         case 1:
  42                 reg = AM335X_USB1_CTRL;
  43                 break;
  44         default:
  45                 WARN_ON(1);
  46                 return;
  47         }
  48
  49         val = readl(usb_ctrl->phy_reg + reg);
  50         if (on) {
  51                 val &= ~(USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN);
  52                 val |= USBPHY_OTGVDET_EN | USBPHY_OTGSESSEND_EN;
  53         } else {
  54                 val |= USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN;
  55         }
  56
  57         writel(val, usb_ctrl->phy_reg + reg);
  58 }
  59
  60 static const struct phy_control ctrl_am335x = {
  61         .phy_power = am335x_phy_power,
  62 };
  63
  64 static const struct of_device_id omap_control_usb_id_table[] = {
  65         { .compatible = "ti,am335x-usb-ctrl-module", .data = &ctrl_am335x },
  66         {}
  67 };
  68 MODULE_DEVICE_TABLE(of, omap_control_usb_id_table);
  69
  70 static struct platform_driver am335x_control_driver;
  71 static int match(struct device *dev, void *data)
  72 {
  73         struct device_node *node = (struct device_node *)data;
  74         return dev->of_node == node &&
  75                 dev->driver == &am335x_control_driver.driver;
  76 }
  77
  78 struct phy_control *am335x_get_phy_control(struct device *dev)
  79 {
  80         struct device_node *node;
  81         struct am335x_control_usb *ctrl_usb;
  82
  83         node = of_parse_phandle(dev->of_node, "ti,ctrl_mod", 0);
  84         if (!node)
  85                 return NULL;
  86
  87         dev = bus_find_device(&platform_bus_type, NULL, node, match);
  88         ctrl_usb = dev_get_drvdata(dev);
  89         if (!ctrl_usb)
  90                 return NULL;
  91         return &ctrl_usb->phy_ctrl;
  92 }
  93 EXPORT_SYMBOL_GPL(am335x_get_phy_control);
  94
  95 static int am335x_control_usb_probe(struct platform_device *pdev)
  96 {
  97         struct resource *res;
  98         struct am335x_control_usb *ctrl_usb;
  99         const struct of_device_id *of_id;
 100         const struct phy_control *phy_ctrl;
 101
 102         of_id = of_match_node(omap_control_usb_id_table, pdev->dev.of_node);
 103         if (!of_id)
 104                 return -EINVAL;
 105
 106         phy_ctrl = of_id->data;
 107
 108         ctrl_usb = devm_kzalloc(&pdev->dev, sizeof(*ctrl_usb), GFP_KERNEL);
 109         if (!ctrl_usb) {
 110                 dev_err(&pdev->dev, "unable to alloc memory for control usb\n");
 111                 return -ENOMEM;
 112         }
 113
 114         ctrl_usb->dev = &pdev->dev;
 115
 116         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy_ctrl");
 117         ctrl_usb->phy_reg = devm_ioremap_resource(&pdev->dev, res);
 118         if (IS_ERR(ctrl_usb->phy_reg))
 119                 return PTR_ERR(ctrl_usb->phy_reg);
 120         spin_lock_init(&ctrl_usb->lock);
 121         ctrl_usb->phy_ctrl = *phy_ctrl;
 122
 123         dev_set_drvdata(ctrl_usb->dev, ctrl_usb);
 124         return 0;
 125 }
 126
 127 static struct platform_driver am335x_control_driver = {
 128         .probe          = am335x_control_usb_probe,
 129         .driver         = {
 130                 .name   = "am335x-control-usb",
 131                 .owner  = THIS_MODULE,
 132                 .of_match_table = of_match_ptr(omap_control_usb_id_table),
 133         },
 134 };
 135
 136 module_platform_driver(am335x_control_driver);
 137 MODULE_LICENSE("GPL v2");