DMA_DBTA
p->dbt[1] = readl_relaxed(p->base + DMA_DBTA);
p->dbt[0] = readl_relaxed(p->base + DMA_DBTA);
writel_relaxed(p->dbt[0], p->base + DMA_DBTA);
dbtx = DMA_DBTA;
readl_relaxed(p->base + DMA_DBTA),