XDMA_DESC_SIZE
#define XDMA_DESC_BLOCK_SIZE (XDMA_DESC_SIZE * XDMA_DESC_ADJACENT)
return block->virt_addr + (XDMA_DESC_ADJACENT - 1) * XDMA_DESC_SIZE;
desc = block->virt_addr + last_blk_desc * XDMA_DESC_SIZE;
desc = block->virt_addr + i * XDMA_DESC_SIZE;
desc->next_desc = cpu_to_le64(block->dma_addr + ((i + 1) * XDMA_DESC_SIZE));
desc = block->virt_addr + i * XDMA_DESC_SIZE;