PDC_HDMA_CTLSTAT
tmp = readl(mmio + PDC_HDMA_CTLSTAT);
writel(tmp, mmio + PDC_HDMA_CTLSTAT);
readl(mmio + PDC_HDMA_CTLSTAT); /* flush */
tmp = readl(mmio + PDC_HDMA_CTLSTAT);
writel(tmp, mmio + PDC_HDMA_CTLSTAT);
readl(mmio + PDC_HDMA_CTLSTAT); /* flush */
readl(mmio + 0x104), readl(mmio + PDC_HDMA_CTLSTAT));
readl(mmio + 0x104), readl(mmio + PDC_HDMA_CTLSTAT));
readl(mmio + 0x104), readl(mmio + PDC_HDMA_CTLSTAT));
readl(mmio + 0x104), readl(mmio + PDC_HDMA_CTLSTAT));