fpga: zynqpl: Add dcache flush support

Buffers must be cache and dma aligned.

Signed-off-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>

drivers/fpga/zynqpl.c

@@ -177,8 +177,8 @@ int zynq_load(Xilinx_desc *desc, const void *buf, size_t bsize)
 		return FPGA_FAIL;
 	}
 
-	if ((u32)buf_start & 0x3) {
-		u32 *new_buf = (u32 *)((u32)buf & ~0x3);
+	if ((u32)buf != ALIGN((u32)buf, ARCH_DMA_MINALIGN)) {
+		u32 *new_buf = (u32 *)ALIGN((u32)buf, ARCH_DMA_MINALIGN);
 
 		printf("%s: Align buffer at %x to %x(swap %d)\n", __func__,
 		       (u32)buf_start, (u32)new_buf, swap);
@@ -284,6 +284,10 @@ int zynq_load(Xilinx_desc *desc, const void *buf, size_t bsize)
 	debug("%s: Source = 0x%08X\n", __func__, (u32)buf);
 	debug("%s: Size = %zu\n", __func__, bsize);
 
+	/* flush(clean & invalidate) d-cache range buf */
+	flush_dcache_range((u32)buf, (u32)buf +
+			   roundup(bsize, ARCH_DMA_MINALIGN));
+
 	/* Set up the transfer */
 	writel((u32)buf | 1, &devcfg_base->dma_src_addr);
 	writel(0xFFFFFFFF, &devcfg_base->dma_dst_addr);