NvRegTxRxControl
base + NvRegTxRxControl);
writel(NVREG_TXRXCTL_BIT2, base + NvRegTxRxControl);
writel(0, base + NvRegTxRxControl);
writel(NVREG_TXRXCTL_BIT1, base + NvRegTxRxControl);
writel(NVREG_TXRXCTL_KICK, base + NvRegTxRxControl);