NvRegReceiverControl
u32 rx_ctrl = readl(base + NvRegReceiverControl);
if ((readl(base + NvRegReceiverControl) & NVREG_RCVCTL_START) && !np->mac_in_use) {
writel(rx_ctrl, base + NvRegReceiverControl);
writel(rx_ctrl, base + NvRegReceiverControl);
u32 rx_ctrl = readl(base + NvRegReceiverControl);
writel(rx_ctrl, base + NvRegReceiverControl);
if (readl(base + NvRegReceiverControl) & NVREG_RCVCTL_START) {
writel(0, base + NvRegReceiverControl);