This patch updates the driver to support 64-bit DMA addressing.

Signed-off-by: Nava kishore Manne <redacted>
---
Changes for v4:
                -Used boolen property insted of addrwith property in the DT
                 as suggested by Arnd Bergmann.
                -Adopt the DT relevant changes into the driver.

Changes for v3:
                -Added new compatable string for 5.00 IP version as suggested by
                 Arnd Bergmann.
                -Used write_fn() insted of lo_hi_writeq() as suggested by
                 Arnd Bergmann.

Changes for v2:
                -Added dma-ranges property in device tree as suggested by Arnd Bergmann.
                -Modified the driver code based on the xlnx,addrwidth.

 .../devicetree/bindings/usb/udc-xilinx.txt         |  5 ++-
 drivers/usb/gadget/udc/udc-xilinx.c                | 52 +++++++++++++++++++++-
 2 files changed, 54 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/usb/udc-xilinx.txt b/Documentation/devicetree/bindings/usb/udc-xilinx.txt
index 47b4e39..d08d972 100644
--- a/Documentation/devicetree/bindings/usb/udc-xilinx.txt
+++ b/Documentation/devicetree/bindings/usb/udc-xilinx.txt

@@ -1,12 +1,14 @@
 Xilinx USB2 device controller

 Required properties:
-- compatible           : Should be "xlnx,usb2-device-4.00.a"
+- compatible           : Should be "xlnx,usb2-device-4.00.a" or
+                         "xlnx,usb2-device-5.00"
 - reg                  : Physical base address and size of the USB2
                          device registers map.
 - interrupts           : Should contain single irq line of USB2 device
                          controller
 - xlnx,has-builtin-dma : if DMA is included
+- xlnx,has-64bit-dma   : if DMA is included 64-bit addressing support.

 Example:
                axi-usb2-device at 42e00000 {

@@ -14,5 +16,6 @@ Example:
                         interrupts = <0x0 0x39 0x1>;
                         reg = <0x42e00000 0x10000>;
                         xlnx,has-builtin-dma;
+                       xlnx,has-64bit-dma;
                 };

diff --git a/drivers/usb/gadget/udc/udc-xilinx.c b/drivers/usb/gadget/udc/udc-xilinx.c
index 1cbb0ac..6fb80c6 100644
--- a/drivers/usb/gadget/udc/udc-xilinx.c
+++ b/drivers/usb/gadget/udc/udc-xilinx.c

@@ -47,6 +47,15 @@
 #define XUSB_DMA_LENGTH_OFFSET         0x0210  /* DMA Length Register */
 #define XUSB_DMA_STATUS_OFFSET         0x0214  /* DMA Status Register */

+/* DMA source Address Reg for LSB */
+#define XUSB_DMA_DSAR_ADDR_OFFSET_LSB   0x0308
+/* DMA source Address Reg for MSB */
+#define XUSB_DMA_DSAR_ADDR_OFFSET_MSB   0x030C
+/* DMA destination Addr Reg LSB */
+#define XUSB_DMA_DDAR_ADDR_OFFSET_LSB   0x0310
+/* DMA destination Addr Reg MSB */
+#define XUSB_DMA_DDAR_ADDR_OFFSET_MSB   0x0314
+
 /* Endpoint Configuration Space offsets */
 #define XUSB_EP_CFGSTATUS_OFFSET       0x00    /* Endpoint Config Status  */
 #define XUSB_EP_BUF0COUNT_OFFSET       0x08    /* Buffer 0 Count */

@@ -169,6 +178,7 @@ struct xusb_ep {
  * @setup: usb_ctrlrequest structure for control requests
  * @req: pointer to dummy request for get status command
  * @dev: pointer to device structure in gadget
+ * @is_extend_dma: flag indiacting whether the dma is 64-bit support or not.
  * @usb_state: device in suspended state or not
  * @remote_wkp: remote wakeup enabled by host
  * @setupseqtx: tx status

@@ -186,6 +196,7 @@ struct xusb_udc {
        struct usb_ctrlrequest setup;
        struct xusb_req *req;
        struct device *dev;
+       bool is_extend_dma;
        u32 usb_state;
        u32 remote_wkp;
        u32 setupseqtx;

@@ -215,6 +226,20 @@ static const struct usb_endpoint_descriptor config_bulk_out_desc = {
 };

 /**
+ * xudc_write64 - write 64bit value to device registers
+ * @ep: pointer to the usb device endpoint structure.
+ * @offset: register offset
+ * @val: data to be written
+ **/
+static void xudc_write64(struct xusb_ep *ep, u32 offset, u64 val)
+{
+       struct xusb_udc *udc = ep->udc;
+
+       udc->write_fn(udc->addr, offset, lower_32_bits(val));
+       udc->write_fn(udc->addr, offset+0x04, upper_32_bits(val));