MMC_I_MASK
CSR_WRITE_4(sc, MMC_I_MASK, sc->sc_imask);
CSR_WRITE_4(sc, MMC_I_MASK, sc->sc_imask);
CSR_WRITE_4(sc, MMC_I_MASK, sc->sc_imask);
CSR_CLR_4(sc, MMC_I_MASK, MMC_I_CLK_IS_OFF);
status = CSR_READ_4(sc, MMC_I_REG) & ~CSR_READ_4(sc, MMC_I_MASK);