usb: dwc2: add support for external vbus supply

[people/ms/u-boot.git] / drivers / usb / host / dwc2.c

diff --git a/drivers/usb/host/dwc2.c b/drivers/usb/host/dwc2.c
index b2f4bc685af165c535eb0ecc2e73f583a333a862..ae7d8fb1da7153d4994b08f31deaa051f91a5eea 100644 (file)
--- a/drivers/usb/host/dwc2.c
+++ b/drivers/usb/host/dwc2.c
@@ -15,9 +15,12 @@
 #include <usbroothubdes.h>
 #include <wait_bit.h>
 #include <asm/io.h>
+#include <power/regulator.h>
 
 #include "dwc2.h"
 
+DECLARE_GLOBAL_DATA_PTR;
+
 /* Use only HC channel 0. */
 #define DWC2_HC_CHANNEL                        0
 
@@ -39,6 +42,8 @@ struct dwc2_priv {
        u8 out_data_toggle[MAX_DEVICE][MAX_ENDPOINT];
        struct dwc2_core_regs *regs;
        int root_hub_devnum;
+       bool ext_vbus;
+       bool oc_disable;
 };
 
 #ifndef CONFIG_DM_USB
@@ -155,6 +160,33 @@ static void dwc_otg_core_reset(struct dwc2_core_regs *regs)
        mdelay(100);
 }
 
+#if defined(CONFIG_DM_USB) && defined(CONFIG_DM_REGULATOR)
+static int dwc_vbus_supply_init(struct udevice *dev)
+{
+       struct udevice *vbus_supply;
+       int ret;
+
+       ret = device_get_supply_regulator(dev, "vbus-supply", &vbus_supply);
+       if (ret) {
+               debug("%s: No vbus supply\n", dev->name);
+               return 0;
+       }
+
+       ret = regulator_set_enable(vbus_supply, true);
+       if (ret) {
+               error("Error enabling vbus supply\n");
+               return ret;
+       }
+
+       return 0;
+}
+#else
+static int dwc_vbus_supply_init(struct udevice *dev)
+{
+       return 0;
+}
+#endif
+
 /*
  * This function initializes the DWC_otg controller registers for
  * host mode.
@@ -163,10 +195,12 @@ static void dwc_otg_core_reset(struct dwc2_core_regs *regs)
  * request queues. Host channels are reset to ensure that they are ready for
  * performing transfers.
  *
+ * @param dev USB Device (NULL if driver model is not being used)
  * @param regs Programming view of DWC_otg controller
  *
  */
-static void dwc_otg_core_host_init(struct dwc2_core_regs *regs)
+static void dwc_otg_core_host_init(struct udevice *dev,
+                                  struct dwc2_core_regs *regs)
 {
        uint32_t nptxfifosize = 0;
        uint32_t ptxfifosize = 0;
@@ -244,6 +278,9 @@ static void dwc_otg_core_host_init(struct dwc2_core_regs *regs)
                        writel(hprt0, &regs->hprt0);
                }
        }
+
+       if (dev)
+               dwc_vbus_supply_init(dev);
 }
 
 /*
@@ -252,8 +289,9 @@ static void dwc_otg_core_host_init(struct dwc2_core_regs *regs)
  *
  * @param regs Programming view of the DWC_otg controller
  */
-static void dwc_otg_core_init(struct dwc2_core_regs *regs)
+static void dwc_otg_core_init(struct dwc2_priv *priv)
 {
+       struct dwc2_core_regs *regs = priv->regs;
        uint32_t ahbcfg = 0;
        uint32_t usbcfg = 0;
        uint8_t brst_sz = CONFIG_DWC2_DMA_BURST_SIZE;
@@ -262,13 +300,15 @@ static void dwc_otg_core_init(struct dwc2_core_regs *regs)
        usbcfg = readl(&regs->gusbcfg);
 
        /* Program the ULPI External VBUS bit if needed */
-#ifdef CONFIG_DWC2_PHY_ULPI_EXT_VBUS
-       usbcfg |= (DWC2_GUSBCFG_ULPI_EXT_VBUS_DRV |
-                  DWC2_GUSBCFG_ULPI_INT_VBUS_INDICATOR |
-                  DWC2_GUSBCFG_INDICATOR_PASSTHROUGH);
-#else
-       usbcfg &= ~DWC2_GUSBCFG_ULPI_EXT_VBUS_DRV;
-#endif
+       if (priv->ext_vbus) {
+               usbcfg |= DWC2_GUSBCFG_ULPI_EXT_VBUS_DRV;
+               if (!priv->oc_disable) {
+                       usbcfg |= DWC2_GUSBCFG_ULPI_INT_VBUS_INDICATOR |
+                                 DWC2_GUSBCFG_INDICATOR_PASSTHROUGH;
+               }
+       } else {
+               usbcfg &= ~DWC2_GUSBCFG_ULPI_EXT_VBUS_DRV;
+       }
 
        /* Set external TS Dline pulsing */
 #ifdef CONFIG_DWC2_TS_DLINE
@@ -1041,7 +1081,7 @@ int _submit_int_msg(struct dwc2_priv *priv, struct usb_device *dev,
        }
 }
 
-static int dwc2_init_common(struct dwc2_priv *priv)
+static int dwc2_init_common(struct udevice *dev, struct dwc2_priv *priv)
 {
        struct dwc2_core_regs *regs = priv->regs;
        uint32_t snpsid;
@@ -1056,8 +1096,14 @@ static int dwc2_init_common(struct dwc2_priv *priv)
                return -ENODEV;
        }
 
-       dwc_otg_core_init(regs);
-       dwc_otg_core_host_init(regs);
+#ifdef CONFIG_DWC2_PHY_ULPI_EXT_VBUS
+       priv->ext_vbus = 1;
+#else
+       priv->ext_vbus = 0;
+#endif
+
+       dwc_otg_core_init(priv);
+       dwc_otg_core_host_init(dev, regs);
 
        clrsetbits_le32(&regs->hprt0, DWC2_HPRT0_PRTENA |
                        DWC2_HPRT0_PRTCONNDET | DWC2_HPRT0_PRTENCHNG |
@@ -1075,6 +1121,15 @@ static int dwc2_init_common(struct dwc2_priv *priv)
                }
        }
 
+       /*
+        * Add a 1 second delay here. This gives the host controller
+        * a bit time before the comminucation with the USB devices
+        * is started (the bus is scanned) and  fixes the USB detection
+        * problems with some problematic USB keys.
+        */
+       if (readl(&regs->gintsts) & DWC2_GINTSTS_CURMODE_HOST)
+               mdelay(1000);
+
        return 0;
 }
 
@@ -1121,7 +1176,7 @@ int usb_lowlevel_init(int index, enum usb_init_type init, void **controller)
        if (board_usb_init(index, USB_INIT_HOST))
                return -1;
 
-       return dwc2_init_common(priv);
+       return dwc2_init_common(NULL, priv);
 }
 
 int usb_lowlevel_stop(int index)
@@ -1169,6 +1224,7 @@ static int dwc2_submit_int_msg(struct udevice *dev, struct usb_device *udev,
 static int dwc2_usb_ofdata_to_platdata(struct udevice *dev)
 {
        struct dwc2_priv *priv = dev_get_priv(dev);
+       const void *prop;
        fdt_addr_t addr;
 
        addr = dev_get_addr(dev);
@@ -1176,14 +1232,22 @@ static int dwc2_usb_ofdata_to_platdata(struct udevice *dev)
                return -EINVAL;
        priv->regs = (struct dwc2_core_regs *)addr;
 
+       prop = fdt_getprop(gd->fdt_blob, dev_of_offset(dev),
+                          "disable-over-current", NULL);
+       if (prop)
+               priv->oc_disable = true;
+
        return 0;
 }
 
 static int dwc2_usb_probe(struct udevice *dev)
 {
        struct dwc2_priv *priv = dev_get_priv(dev);
+       struct usb_bus_priv *bus_priv = dev_get_uclass_priv(dev);
+
+       bus_priv->desc_before_addr = true;
 
-       return dwc2_init_common(priv);
+       return dwc2_init_common(dev, priv);
 }
 
 static int dwc2_usb_remove(struct udevice *dev)