This patch updates the driver to support 64-bit DMA addressing. Signed-off-by: Nava kishore Manne <navam@xxxxxxxxxx> --- 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 | 39 ++++++++++++++++++++-- 2 files changed, 40 insertions(+), 4 deletions(-) diff --git a/Documentation/devicetree/bindings/usb/udc-xilinx.txt b/Documentation/devicetree/bindings/usb/udc-xilinx.txt index 47b4e39..850d792 100644 --- a/Documentation/devicetree/bindings/usb/udc-xilinx.txt +++ b/Documentation/devicetree/bindings/usb/udc-xilinx.txt @@ -7,12 +7,15 @@ Required properties: - interrupts : Should contain single irq line of USB2 device controller - xlnx,has-builtin-dma : if DMA is included - +- dma-ranges: Should be as the following <dma_addr cpu_addr max_len>. +- 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>; + dma-ranges = <0x00000000 0x00000000 0x40000000>; 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..702ab9e 100644 --- a/drivers/usb/gadget/udc/udc-xilinx.c +++ b/drivers/usb/gadget/udc/udc-xilinx.c @@ -28,6 +28,7 @@ #include <linux/of_irq.h> #include <linux/prefetch.h> #include <linux/usb/ch9.h> +#include <linux/io-64-nonatomic-lo-hi.h> #include <linux/usb/gadget.h> /* Register offsets for the USB device.*/ @@ -47,6 +48,15 @@ #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 +186,7 @@ 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 +204,7 @@ 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 +226,17 @@ 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) +{ + lo_hi_writeq(val, addr + offset); +} + +/** * xudc_write32 - little endian write to device registers * @addr: base addr of device registers * @offset: register offset @@ -330,8 +352,13 @@ 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 +2124,12 @@ 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"); + + /* Set the dma mask bits */ + dma_set_mask(&pdev->dev, DMA_BIT_MASK(udc->dma_addrwidth)); /* Setup gadget structure */ udc->gadget.ops = &xusb_udc_ops; udc->gadget.max_speed = USB_SPEED_HIGH; -- 2.1.2 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html