RXDP
dev->base + RXDP);
writel(dev->rx_info.phy_descs, dev->base + RXDP);
writel(0, dev->base + RXDP);
readl(dev->base + RXDP),
} else if (isr & (RXDP))
while (ioread32(port->membase + TIMBUART_ISR) & RXDP) {
#define RXFLAGS (RXDP | RXBAF | RXBF | RXTT | RXBNAE)