IGS_REG_SIZE
dc->dc_iobase + IGS_REG_BASE, IGS_REG_SIZE,
bus_space_unmap(dc->dc_iot, dc->dc_ioh, IGS_REG_SIZE);
bus_space_unmap(dc->dc_iot, dc->dc_ioh, IGS_REG_SIZE);
bus_space_unmap(iot, regh, IGS_REG_SIZE);
ret = bus_space_map(iot, iobase + IGS_REG_BASE, IGS_REG_SIZE, ioflags,
dc->dc_iobase + IGS_REG_BASE, IGS_REG_SIZE,