UARTDM_TF
msm_write(port, c, msm_port->is_uartdm ? UARTDM_TF : MSM_UART_TF);
tf = port->membase + UARTDM_TF;
conf.dst_addr = base + UARTDM_TF;
tf = port->membase + UARTDM_TF;
tf = port->membase + UARTDM_TF;