XPS2_IPIER_OFFSET
out_be32(drvdata->base_address + XPS2_IPIER_OFFSET, XPS2_IPIXR_RX_ALL);
out_be32(drvdata->base_address + XPS2_IPIER_OFFSET, 0x00);
out_be32(drvdata->base_address + XPS2_IPIER_OFFSET, 0);