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 <linux/delay.h>
   7 #include <linux/usb/otg.h>
   8 #include "phy-am335x-control.h"
   9
  10 struct am335x_control_usb {
  11         struct device *dev;
  12         void __iomem *phy_reg;
  13         void __iomem *wkup;
  14         spinlock_t lock;
  15         struct phy_control phy_ctrl;
  16 };
  17
  18 #define AM335X_USB0_CTRL                0x0
  19 #define AM335X_USB1_CTRL                0x8
  20 #define AM335x_USB_WKUP                 0x0
  21
  22 #define USBPHY_CM_PWRDN         (1 << 0)
  23 #define USBPHY_OTG_PWRDN        (1 << 1)
  24 #define USBPHY_OTGVDET_EN       (1 << 19)
  25 #define USBPHY_OTGSESSEND_EN    (1 << 20)
  26
  27 #define AM335X_PHY0_WK_EN       (1 << 0)
  28 #define AM335X_PHY1_WK_EN       (1 << 8)
  29
  30 static void am335x_phy_wkup(struct  phy_control *phy_ctrl, u32 id, bool on)
  31 {
  32         struct am335x_control_usb *usb_ctrl;
  33         u32 val;
  34         u32 reg;
  35
  36         usb_ctrl = container_of(phy_ctrl, struct am335x_control_usb, phy_ctrl);
  37
  38         switch (id) {
  39         case 0:
  40                 reg = AM335X_PHY0_WK_EN;
  41                 break;
  42         case 1:
  43                 reg = AM335X_PHY1_WK_EN;
  44                 break;
  45         default:
  46                 WARN_ON(1);
  47                 return;
  48         }
  49
  50         spin_lock(&usb_ctrl->lock);
  51         val = readl(usb_ctrl->wkup);
  52
  53         if (on)
  54                 val |= reg;
  55         else
  56                 val &= ~reg;
  57
  58         writel(val, usb_ctrl->wkup);
  59         spin_unlock(&usb_ctrl->lock);
  60 }
  61
  62 static void am335x_phy_power(struct phy_control *phy_ctrl, u32 id,
  63                                 enum usb_dr_mode dr_mode, bool on)
  64 {
  65         struct am335x_control_usb *usb_ctrl;
  66         u32 val;
  67         u32 reg;
  68
  69         usb_ctrl = container_of(phy_ctrl, struct am335x_control_usb, phy_ctrl);
  70
  71         switch (id) {
  72         case 0:
  73                 reg = AM335X_USB0_CTRL;
  74                 break;
  75         case 1:
  76                 reg = AM335X_USB1_CTRL;
  77                 break;
  78         default:
  79                 WARN_ON(1);
  80                 return;
  81         }
  82
  83         val = readl(usb_ctrl->phy_reg + reg);
  84         if (on) {
  85                 if (dr_mode == USB_DR_MODE_HOST) {
  86                         val &= ~(USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN |
  87                                         USBPHY_OTGVDET_EN);
  88                         val |= USBPHY_OTGSESSEND_EN;
  89                 } else {
  90                         val &= ~(USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN);
  91                         val |= USBPHY_OTGVDET_EN | USBPHY_OTGSESSEND_EN;
  92                 }
  93         } else {
  94                 val |= USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN;
  95         }
  96
  97         writel(val, usb_ctrl->phy_reg + reg);
  98
  99         /*
 100          * Give the PHY ~1ms to complete the power up operation.
 101          * Tests have shown unstable behaviour if other USB PHY related
 102          * registers are written too shortly after such a transition.
 103          */
 104         if (on)
 105                 mdelay(1);
 106 }
 107
 108 static const struct phy_control ctrl_am335x = {
 109         .phy_power = am335x_phy_power,
 110         .phy_wkup = am335x_phy_wkup,
 111 };
 112
 113 static const struct of_device_id omap_control_usb_id_table[] = {
 114         { .compatible = "ti,am335x-usb-ctrl-module", .data = &ctrl_am335x },
 115         {}
 116 };
 117 MODULE_DEVICE_TABLE(of, omap_control_usb_id_table);
 118
 119 static struct platform_driver am335x_control_driver;
 120 static int match(struct device *dev, void *data)
 121 {
 122         struct device_node *node = (struct device_node *)data;
 123         return dev->of_node == node &&
 124                 dev->driver == &am335x_control_driver.driver;
 125 }
 126
 127 struct phy_control *am335x_get_phy_control(struct device *dev)
 128 {
 129         struct device_node *node;
 130         struct am335x_control_usb *ctrl_usb;
 131
 132         node = of_parse_phandle(dev->of_node, "ti,ctrl_mod", 0);
 133         if (!node)
 134                 return NULL;
 135
 136         dev = bus_find_device(&platform_bus_type, NULL, node, match);
 137         of_node_put(node);
 138         if (!dev)
 139                 return NULL;
 140
 141         ctrl_usb = dev_get_drvdata(dev);
 142         put_device(dev);
 143         if (!ctrl_usb)
 144                 return NULL;
 145         return &ctrl_usb->phy_ctrl;
 146 }
 147 EXPORT_SYMBOL_GPL(am335x_get_phy_control);
 148
 149 static int am335x_control_usb_probe(struct platform_device *pdev)
 150 {
 151         struct resource *res;
 152         struct am335x_control_usb *ctrl_usb;
 153         const struct of_device_id *of_id;
 154         const struct phy_control *phy_ctrl;
 155
 156         of_id = of_match_node(omap_control_usb_id_table, pdev->dev.of_node);
 157         if (!of_id)
 158                 return -EINVAL;
 159
 160         phy_ctrl = of_id->data;
 161
 162         ctrl_usb = devm_kzalloc(&pdev->dev, sizeof(*ctrl_usb), GFP_KERNEL);
 163         if (!ctrl_usb)
 164                 return -ENOMEM;
 165
 166         ctrl_usb->dev = &pdev->dev;
 167
 168         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy_ctrl");
 169         ctrl_usb->phy_reg = devm_ioremap_resource(&pdev->dev, res);
 170         if (IS_ERR(ctrl_usb->phy_reg))
 171                 return PTR_ERR(ctrl_usb->phy_reg);
 172
 173         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "wakeup");
 174         ctrl_usb->wkup = devm_ioremap_resource(&pdev->dev, res);
 175         if (IS_ERR(ctrl_usb->wkup))
 176                 return PTR_ERR(ctrl_usb->wkup);
 177
 178         spin_lock_init(&ctrl_usb->lock);
 179         ctrl_usb->phy_ctrl = *phy_ctrl;
 180
 181         dev_set_drvdata(ctrl_usb->dev, ctrl_usb);
 182         return 0;
 183 }
 184
 185 static struct platform_driver am335x_control_driver = {
 186         .probe          = am335x_control_usb_probe,
 187         .driver         = {
 188                 .name   = "am335x-control-usb",
 189                 .of_match_table = omap_control_usb_id_table,
 190         },
 191 };
 192
 193 module_platform_driver(am335x_control_driver);
 194 MODULE_LICENSE("GPL v2");