BWI_MAC_INTR_STATUS
CSR_WRITE_4(sc, BWI_MAC_INTR_STATUS, BWI_ALL_INTRS);
intr_status = CSR_READ_4(sc, BWI_MAC_INTR_STATUS);
CSR_READ_4(sc, BWI_MAC_INTR_STATUS); /* dummy read */
CSR_WRITE_4(sc, BWI_MAC_INTR_STATUS, BWI_INTR_READY);
CSR_READ_4(sc, BWI_MAC_INTR_STATUS);
if (CSR_READ_4(sc, BWI_MAC_INTR_STATUS) & BWI_INTR_READY)
CSR_WRITE_4(sc, BWI_MAC_INTR_STATUS, BWI_INTR_TIMER1);
val = CSR_READ_4(sc, BWI_MAC_INTR_STATUS);
intr_status = CSR_READ_4(sc, BWI_MAC_INTR_STATUS);
CSR_WRITE_4(sc, BWI_MAC_INTR_STATUS, intr_status);
intr_status = CSR_READ_4(sc, BWI_MAC_INTR_STATUS);