SPMMC_CARD_MEDIATYPE_SRCDST_REG
srcdst = readl(host->base + SPMMC_CARD_MEDIATYPE_SRCDST_REG);
writel(srcdst, host->base + SPMMC_CARD_MEDIATYPE_SRCDST_REG);
srcdst = readl(host->base + SPMMC_CARD_MEDIATYPE_SRCDST_REG);
writel(srcdst, host->base + SPMMC_CARD_MEDIATYPE_SRCDST_REG);
value = readl(host->base + SPMMC_CARD_MEDIATYPE_SRCDST_REG);
writel(value, host->base + SPMMC_CARD_MEDIATYPE_SRCDST_REG);