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 #define AM335X_PHY0_WK_EN       (1 << 0)
  30 #define AM335X_PHY1_WK_EN       (1 << 8)
  31
  32 static void am335x_phy_wkup(struct  phy_control *phy_ctrl, u32 id, bool on)
  33 {
  34         struct am335x_control_usb *usb_ctrl;
  35         u32 val;
  36         u32 reg;
  37
  38         usb_ctrl = container_of(phy_ctrl, struct am335x_control_usb, phy_ctrl);
  39
  40         switch (id) {
  41         case 0:
  42                 reg = AM335X_PHY0_WK_EN;
  43                 break;
  44         case 1:
  45                 reg = AM335X_PHY1_WK_EN;
  46                 break;
  47         default:
  48                 WARN_ON(1);
  49                 return;
  50         }
  51
  52         spin_lock(&usb_ctrl->lock);
  53         val = readl(usb_ctrl->wkup);
  54
  55         if (on)
  56                 val |= reg;
  57         else
  58                 val &= ~reg;
  59
  60         writel(val, usb_ctrl->wkup);
  61         spin_unlock(&usb_ctrl->lock);
  62 }
  63
  64 static void am335x_phy_power(struct phy_control *phy_ctrl, u32 id, 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                 val &= ~(USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN);
  87                 val |= USBPHY_OTGVDET_EN | USBPHY_OTGSESSEND_EN;
  88         } else {
  89                 val |= USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN;
  90         }
  91
  92         writel(val, usb_ctrl->phy_reg + reg);
  93 }
  94
  95 static const struct phy_control ctrl_am335x = {
  96         .phy_power = am335x_phy_power,
  97         .phy_wkup = am335x_phy_wkup,
  98 };
  99
 100 static const struct of_device_id omap_control_usb_id_table[] = {
 101         { .compatible = "ti,am335x-usb-ctrl-module", .data = &ctrl_am335x },
 102         {}
 103 };
 104 MODULE_DEVICE_TABLE(of, omap_control_usb_id_table);
 105
 106 static struct platform_driver am335x_control_driver;
 107 static int match(struct device *dev, void *data)
 108 {
 109         struct device_node *node = (struct device_node *)data;
 110         return dev->of_node == node &&
 111                 dev->driver == &am335x_control_driver.driver;
 112 }
 113
 114 struct phy_control *am335x_get_phy_control(struct device *dev)
 115 {
 116         struct device_node *node;
 117         struct am335x_control_usb *ctrl_usb;
 118
 119         node = of_parse_phandle(dev->of_node, "ti,ctrl_mod", 0);
 120         if (!node)
 121                 return NULL;
 122
 123         dev = bus_find_device(&platform_bus_type, NULL, node, match);
 124         ctrl_usb = dev_get_drvdata(dev);
 125         if (!ctrl_usb)
 126                 return NULL;
 127         return &ctrl_usb->phy_ctrl;
 128 }
 129 EXPORT_SYMBOL_GPL(am335x_get_phy_control);
 130
 131 static int am335x_control_usb_probe(struct platform_device *pdev)
 132 {
 133         struct resource *res;
 134         struct am335x_control_usb *ctrl_usb;
 135         const struct of_device_id *of_id;
 136         const struct phy_control *phy_ctrl;
 137
 138         of_id = of_match_node(omap_control_usb_id_table, pdev->dev.of_node);
 139         if (!of_id)
 140                 return -EINVAL;
 141
 142         phy_ctrl = of_id->data;
 143
 144         ctrl_usb = devm_kzalloc(&pdev->dev, sizeof(*ctrl_usb), GFP_KERNEL);
 145         if (!ctrl_usb) {
 146                 dev_err(&pdev->dev, "unable to alloc memory for control usb\n");
 147                 return -ENOMEM;
 148         }
 149
 150         ctrl_usb->dev = &pdev->dev;
 151
 152         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy_ctrl");
 153         ctrl_usb->phy_reg = devm_ioremap_resource(&pdev->dev, res);
 154         if (IS_ERR(ctrl_usb->phy_reg))
 155                 return PTR_ERR(ctrl_usb->phy_reg);
 156
 157         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "wakeup");
 158         ctrl_usb->wkup = devm_ioremap_resource(&pdev->dev, res);
 159         if (IS_ERR(ctrl_usb->wkup))
 160                 return PTR_ERR(ctrl_usb->wkup);
 161
 162         spin_lock_init(&ctrl_usb->lock);
 163         ctrl_usb->phy_ctrl = *phy_ctrl;
 164
 165         dev_set_drvdata(ctrl_usb->dev, ctrl_usb);
 166         return 0;
 167 }
 168
 169 static struct platform_driver am335x_control_driver = {
 170         .probe          = am335x_control_usb_probe,
 171         .driver         = {
 172                 .name   = "am335x-control-usb",
 173                 .owner  = THIS_MODULE,
 174                 .of_match_table = omap_control_usb_id_table,
 175         },
 176 };
 177
 178 module_platform_driver(am335x_control_driver);
 179 MODULE_LICENSE("GPL v2");