LPC32XX_UART_DLL_FIFO
__raw_writel(0x00, LPC32XX_UART_DLL_FIFO(puart));
LPC32XX_UART_DLL_FIFO(puart));
__raw_writel(0x00, LPC32XX_UART_DLL_FIFO(puart));
tmp = __raw_readl(LPC32XX_UART_DLL_FIFO(puart));