MSHC2_EMMC_CTRL
value = sdhci_readb(host, MSHC2_EMMC_CTRL);
sdhci_writeb(host, value, MSHC2_EMMC_CTRL);
value = sdhci_readb(host, MSHC2_EMMC_CTRL) &
sdhci_writeb(host, value, MSHC2_EMMC_CTRL);
MSHC2_EMMC_CTRL);