[PATCH] dmaengine: vdma: Add 64 bit addressing support to the driver

Anurag Kumar Vulisha
2015-08-05T11:47:37Z

This patch adds the 64 bit addressing support to the vdma driver.

Signed-off-by: Anurag Kumar Vulisha <anuragku@xilinx.com>
---
drivers/dma/Kconfig | 2 +-
drivers/dma/xilinx/xilinx_vdma.c | 36 ++++++++++++++++++++++++++++++------
2 files changed, 31 insertions(+), 7 deletions(-)

diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index bda2cb0..a7cd0a8 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -398,7 +398,7 @@ config FSL_EDMA

config XILINX_VDMA
tristate "Xilinx AXI VDMA Engine"
- depends on (ARCH_ZYNQ || MICROBLAZE)
+ depends on (ARCH_ZYNQ || MICROBLAZE || ARM64)
select DMA_ENGINE
help
Enable support for Xilinx AXI VDMA Soft IP.
diff --git a/drivers/dma/xilinx/xilinx_vdma.c b/drivers/dma/xilinx/xilinx_vdma.c
index d8434d4..3dcbd29 100644
--- a/drivers/dma/xilinx/xilinx_vdma.c
+++ b/drivers/dma/xilinx/xilinx_vdma.c
@@ -98,7 +98,11 @@
#define XILINX_VDMA_FRMDLY_STRIDE_FRMDLY_SHIFT 24
#define XILINX_VDMA_FRMDLY_STRIDE_STRIDE_SHIFT 0

+#if defined(CONFIG_PHYS_ADDR_T_64BIT)
+#define XILINX_VDMA_REG_START_ADDRESS(n) (0x000c + 8 * (n))
+#else
#define XILINX_VDMA_REG_START_ADDRESS(n) (0x000c + 4 * (n))
+#endif

/* HW specific definitions */
#define XILINX_VDMA_MAX_CHANS_PER_DEVICE 0x2
@@ -143,16 +147,16 @@
* @next_desc: Next Descriptor Pointer @0x00
* @pad1: Reserved @0x04
* @buf_addr: Buffer address @0x08
- * @pad2: Reserved @0x0C
- * @vsize: Vertical Size @0x10
- * @hsize: Horizontal Size @0x14
+ * @pad2: Reserved @0x10
+ * @vsize: Vertical Size @0x14
+ * @hsize: Horizontal Size @0x18
* @stride: Number of bytes between the first
- * pixels of each horizontal line @0x18
+ * pixels of each horizontal line @0x1C
*/
struct xilinx_vdma_desc_hw {
u32 next_desc;
u32 pad1;
- u32 buf_addr;
+ u64 buf_addr;
u32 pad2;
u32 vsize;
u32 hsize;
@@ -272,6 +276,20 @@ static inline void vdma_desc_write(struct xilinx_vdma_chan *chan, u32 reg,
vdma_write(chan, chan->desc_offset + reg, value);
}

+#if defined(CONFIG_PHYS_ADDR_T_64BIT)
+static inline void vdma_desc_write_64(struct xilinx_vdma_chan *chan, u32 reg,
+ u64 value)
+{
+ /* Write the lsb 32 bits*/
+ writel(lower_32_bits(value),
+ chan->xdev->regs + chan->desc_offset + reg);
+
+ /* Write the msb 32 bits */
+ writel(upper_32_bits(value),
+ chan->xdev->regs + chan->desc_offset + reg + 4);
+}
+#endif
+
static inline u32 vdma_ctrl_read(struct xilinx_vdma_chan *chan, u32 reg)
{
return vdma_read(chan, chan->ctrl_offset + reg);
@@ -700,9 +718,15 @@ static void xilinx_vdma_start_transfer(struct xilinx_vdma_chan *chan)
int i = 0;

list_for_each_entry(segment, &desc->segments, node) {
- vdma_desc_write(chan,
+#if defined(CONFIG_PHYS_ADDR_T_64BIT)
+ vdma_desc_write_64(chan,
XILINX_VDMA_REG_START_ADDRESS(i++),
segment->hw.buf_addr);
+#else
+ vdma_desc_write(chan,
+ XILINX_VDMA_REG_START_ADDRESS(i++),
+ (u32)segment->hw.buf_addr);
+#endif
last = segment;
}

--
1.7.4