[PATCH] Axi-usb: Add support for 64-bit addressing.

Nava kishore Manne
2016-04-11T07:41:46Z

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

Signed-off-by: Nava kishore Manne <navam@xilinx.com>
---
.../devicetree/bindings/usb/udc-xilinx.txt | 3 +-
drivers/usb/gadget/udc/udc-xilinx.c | 38 ++++++++++++++++++++--
2 files changed, 37 insertions(+), 4 deletions(-)

diff --git a/Documentation/devicetree/bindings/usb/udc-xilinx.txt b/Documentation/devicetree/bindings/usb/udc-xilinx.txt
index 47b4e39..d417872 100644
--- a/Documentation/devicetree/bindings/usb/udc-xilinx.txt
+++ b/Documentation/devicetree/bindings/usb/udc-xilinx.txt
@@ -7,12 +7,13 @@ Required properties:
- interrupts : Should contain single irq line of USB2 device
controller
- xlnx,has-builtin-dma : if DMA is included
-
+- xlnx,addrwidth : Should be the dma addressing size in bits(ex: 40 bits).
Example:
axi-usb2-device@42e00000 {
compatible = "xlnx,usb2-device-4.00.a";
interrupts = <0x0 0x39 0x1>;
reg = <0x42e00000 0x10000>;
xlnx,has-builtin-dma;
+ xlnx,addrwidth = <0x28>;
};

diff --git a/drivers/usb/gadget/udc/udc-xilinx.c b/drivers/usb/gadget/udc/udc-xilinx.c
index 1cbb0ac..eeb1401 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 */
@@ -176,6 +185,7 @@ struct xusb_ep {
* @addr: the usb device base address
* @lock: instance of spinlock
* @dma_enabled: flag indicating whether the dma is included in the system
+ * @dma_addrwidth:Indicate the DMA address width.
* @read_fn: function pointer to read device registers
* @write_fn: function pointer to write to device registers
*/
@@ -193,7 +203,7 @@ struct xusb_udc {
void __iomem *addr;
spinlock_t lock;
bool dma_enabled;
-
+ u32 dma_addrwidth;
unsigned int (*read_fn)(void __iomem *);
void (*write_fn)(void __iomem *, u32, u32);
};
@@ -215,6 +225,19 @@ static const struct usb_endpoint_descriptor config_bulk_out_desc = {
};

/**
+ * xudc_write64 - write 64bit value to device registers
+ * @addr: base addr of device registers
+ * @offset: register offset
+ * @val: data to be written
+ **/
+static void xudc_write64(void __iomem *addr, u32 offset, u64 val)
+{
+#if defined(CONFIG_PHYS_ADDR_T_64BIT)
+ writeq(val, addr + offset);
+#endif
+}
+
+/**
* xudc_write32 - little endian write to device registers
* @addr: base addr of device registers
* @offset: register offset
@@ -330,8 +353,13 @@ static int xudc_start_dma(struct xusb_ep *ep, dma_addr_t src,
* destination registers and then set the length
* into the DMA length register.
*/
- udc->write_fn(udc->addr, XUSB_DMA_DSAR_ADDR_OFFSET, src);
- udc->write_fn(udc->addr, XUSB_DMA_DDAR_ADDR_OFFSET, dst);
+ if (udc->dma_addrwidth > 32) {
+ xudc_write64(udc->addr, XUSB_DMA_DSAR_ADDR_OFFSET_LSB, src);
+ xudc_write64(udc->addr, XUSB_DMA_DDAR_ADDR_OFFSET_LSB, dst);
+ } else {
+ udc->write_fn(udc->addr, XUSB_DMA_DSAR_ADDR_OFFSET, src);
+ udc->write_fn(udc->addr, XUSB_DMA_DDAR_ADDR_OFFSET, dst);
+ }
udc->write_fn(udc->addr, XUSB_DMA_LENGTH_OFFSET, length);

/*
@@ -2097,6 +2125,10 @@ static int xudc_probe(struct platform_device *pdev)

udc->dma_enabled = of_property_read_bool(np, "xlnx,has-builtin-dma");

+ ret = of_property_read_u32(np, "xlnx,addrwidth", &udc->dma_addrwidth);
+ if (ret < 0)
+ dev_warn(&pdev->dev, "missing xlnx,addrwidth property\n");
+
/* Setup gadget structure */
udc->gadget.ops = &xusb_udc_ops;
udc->gadget.max_speed = USB_SPEED_HIGH;
--
2.1.2