EMC_MRR
writel_relaxed(val, emc->regs + EMC_MRR);
val = readl_relaxed(emc->regs + EMC_MRR);
emc_writel(emc, value, EMC_MRR);
value = emc_channel_readl(emc, i, EMC_MRR);
writel_relaxed(val, emc->regs + EMC_MRR);
val = readl_relaxed(emc->regs + EMC_MRR);