RK_SPI_IMR
RK_SPI_WRITE_4(sc, RK_SPI_IMR, sc->intreg);
RK_SPI_WRITE_4(sc, RK_SPI_IMR, 0);
intreg = RK_SPI_READ_4(sc, RK_SPI_IMR);
(void)RK_SPI_WRITE_4(sc, RK_SPI_IMR, sc->intreg);
(void)RK_SPI_READ_4(sc, RK_SPI_IMR);