TXDMA_CFG
val = readl(gp->regs + TXDMA_CFG);
writel(val | TXDMA_CFG_ENABLE, gp->regs + TXDMA_CFG);
val = readl(gp->regs + TXDMA_CFG);
writel(val & ~TXDMA_CFG_ENABLE, gp->regs + TXDMA_CFG);
writel(val, gp->regs + TXDMA_CFG);
writel(0, gp->regs + TXDMA_CFG);
readl(gp->regs + TXDMA_CFG),