AST_UDC_EP_DMA_SIZE
ep->epn_buf = udc->ep0_buf + (i * AST_UDC_EP_DMA_SIZE);
ep->epn_buf_dma = udc->ep0_buf_dma + (i * AST_UDC_EP_DMA_SIZE);
AST_UDC_EP_DMA_SIZE * AST_UDC_NUM_ENDPOINTS,
AST_UDC_EP_DMA_SIZE *