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 #include "am35x-phy-control.h"
   7
   8 struct am335x_control_usb {
   9         struct device *dev;
  10         void __iomem *phy_reg;
  11         void __iomem *wkup;
  12         spinlock_t lock;
  13         struct phy_control phy_ctrl;
  14 };
  15
  16 #define AM335X_USB0_CTRL                0x0
  17 #define AM335X_USB1_CTRL                0x8
  18 #define AM335x_USB_WKUP                 0x0
  19
  20 #define USBPHY_CM_PWRDN         (1 << 0)
  21 #define USBPHY_OTG_PWRDN        (1 << 1)
  22 #define USBPHY_OTGVDET_EN       (1 << 19)
  23 #define USBPHY_OTGSESSEND_EN    (1 << 20)
  24
  25 #define AM335X_PHY0_WK_EN       (1 << 0)
  26 #define AM335X_PHY1_WK_EN       (1 << 8)
  27
  28 static void am335x_phy_wkup(struct  phy_control *phy_ctrl, u32 id, bool on)
  29 {
  30         struct am335x_control_usb *usb_ctrl;
  31         u32 val;
  32         u32 reg;
  33
  34         usb_ctrl = container_of(phy_ctrl, struct am335x_control_usb, phy_ctrl);
  35
  36         switch (id) {
  37         case 0:
  38                 reg = AM335X_PHY0_WK_EN;
  39                 break;
  40         case 1:
  41                 reg = AM335X_PHY1_WK_EN;
  42                 break;
  43         default:
  44                 WARN_ON(1);
  45                 return;
  46         }
  47
  48         spin_lock(&usb_ctrl->lock);
  49         val = readl(usb_ctrl->wkup);
  50
  51         if (on)
  52                 val |= reg;
  53         else
  54                 val &= ~reg;
  55
  56         writel(val, usb_ctrl->wkup);
  57         spin_unlock(&usb_ctrl->lock);
  58 }
  59
  60 static void am335x_phy_power(struct phy_control *phy_ctrl, u32 id, bool on)
  61 {
  62         struct am335x_control_usb *usb_ctrl;
  63         u32 val;
  64         u32 reg;
  65
  66         usb_ctrl = container_of(phy_ctrl, struct am335x_control_usb, phy_ctrl);
  67
  68         switch (id) {
  69         case 0:
  70                 reg = AM335X_USB0_CTRL;
  71                 break;
  72         case 1:
  73                 reg = AM335X_USB1_CTRL;
  74                 break;
  75         default:
  76                 WARN_ON(1);
  77                 return;
  78         }
  79
  80         val = readl(usb_ctrl->phy_reg + reg);
  81         if (on) {
  82                 val &= ~(USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN);
  83                 val |= USBPHY_OTGVDET_EN | USBPHY_OTGSESSEND_EN;
  84         } else {
  85                 val |= USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN;
  86         }
  87
  88         writel(val, usb_ctrl->phy_reg + reg);
  89 }
  90
  91 static const struct phy_control ctrl_am335x = {
  92         .phy_power = am335x_phy_power,
  93         .phy_wkup = am335x_phy_wkup,
  94 };
  95
  96 static const struct of_device_id omap_control_usb_id_table[] = {
  97         { .compatible = "ti,am335x-usb-ctrl-module", .data = &ctrl_am335x },
  98         {}
  99 };
 100 MODULE_DEVICE_TABLE(of, omap_control_usb_id_table);
 101
 102 static struct platform_driver am335x_control_driver;
 103 static int match(struct device *dev, void *data)
 104 {
 105         struct device_node *node = (struct device_node *)data;
 106         return dev->of_node == node &&
 107                 dev->driver == &am335x_control_driver.driver;
 108 }
 109
 110 struct phy_control *am335x_get_phy_control(struct device *dev)
 111 {
 112         struct device_node *node;
 113         struct am335x_control_usb *ctrl_usb;
 114
 115         node = of_parse_phandle(dev->of_node, "ti,ctrl_mod", 0);
 116         if (!node)
 117                 return NULL;
 118
 119         dev = bus_find_device(&platform_bus_type, NULL, node, match);
 120         ctrl_usb = dev_get_drvdata(dev);
 121         if (!ctrl_usb)
 122                 return NULL;
 123         return &ctrl_usb->phy_ctrl;
 124 }
 125 EXPORT_SYMBOL_GPL(am335x_get_phy_control);
 126
 127 static int am335x_control_usb_probe(struct platform_device *pdev)
 128 {
 129         struct resource *res;
 130         struct am335x_control_usb *ctrl_usb;
 131         const struct of_device_id *of_id;
 132         const struct phy_control *phy_ctrl;
 133
 134         of_id = of_match_node(omap_control_usb_id_table, pdev->dev.of_node);
 135         if (!of_id)
 136                 return -EINVAL;
 137
 138         phy_ctrl = of_id->data;
 139
 140         ctrl_usb = devm_kzalloc(&pdev->dev, sizeof(*ctrl_usb), GFP_KERNEL);
 141         if (!ctrl_usb) {
 142                 dev_err(&pdev->dev, "unable to alloc memory for control usb\n");
 143                 return -ENOMEM;
 144         }
 145
 146         ctrl_usb->dev = &pdev->dev;
 147
 148         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy_ctrl");
 149         ctrl_usb->phy_reg = devm_ioremap_resource(&pdev->dev, res);
 150         if (IS_ERR(ctrl_usb->phy_reg))
 151                 return PTR_ERR(ctrl_usb->phy_reg);
 152
 153         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "wakeup");
 154         ctrl_usb->wkup = devm_ioremap_resource(&pdev->dev, res);
 155         if (IS_ERR(ctrl_usb->wkup))
 156                 return PTR_ERR(ctrl_usb->wkup);
 157
 158         spin_lock_init(&ctrl_usb->lock);
 159         ctrl_usb->phy_ctrl = *phy_ctrl;
 160
 161         dev_set_drvdata(ctrl_usb->dev, ctrl_usb);
 162         return 0;
 163 }
 164
 165 static struct platform_driver am335x_control_driver = {
 166         .probe          = am335x_control_usb_probe,
 167         .driver         = {
 168                 .name   = "am335x-control-usb",
 169                 .owner  = THIS_MODULE,
 170                 .of_match_table = omap_control_usb_id_table,
 171         },
 172 };
 173
 174 module_platform_driver(am335x_control_driver);
 175 MODULE_LICENSE("GPL v2");