LPC32XX_HSUART_FIFO
writel((u32)ch, LPC32XX_HSUART_FIFO(port->membase));
readl(LPC32XX_HSUART_FIFO(port->membase));
tmp = readl(LPC32XX_HSUART_FIFO(port->membase));
tmp = readl(LPC32XX_HSUART_FIFO(port->membase));
writel(ch, LPC32XX_HSUART_FIFO(port->membase)));