EDMA_IEM
MVSATA_EDMA_WRITE_4(mvport, EDMA_IEM, 0);
MVSATA_EDMA_WRITE_4(mvport, EDMA_IEM, reg);
mvport->port, cause, MVSATA_EDMA_READ_4(mvport, EDMA_IEM),
cause &= MVSATA_EDMA_READ_4(mvport, EDMA_IEM);