SCIF_DR
#define SCIF_RDxF_CLEAR (u32)(~(SCIF_DR | SCIF_RDF))
ssr & ~(SCIF_DR | SCxSR_RDxF(port)));
#define SCxSR_RDxF(port) (((port)->type == PORT_SCI) ? SCI_RDRF : SCIF_DR | SCIF_RDF)