CDNS_UART_IDR
writel(status, port->membase + CDNS_UART_IDR);
writel(imr, port->membase + CDNS_UART_IDR);
writel(CDNS_UART_IXR_TOUT, port->membase + CDNS_UART_IDR);
writel(CDNS_UART_IXR_TXEMPTY, port->membase + CDNS_UART_IDR);
writel(CDNS_UART_RX_IRQS, port->membase + CDNS_UART_IDR);