AC97_BUSY
if ((YREAD2(sc, AC97_STAT_ADDR1) & AC97_BUSY) == 0)
if ((YREAD2(sc, AC97_STAT_ADDR2) & AC97_BUSY) == 0)
if ((YREAD2(sc, AC97_STAT_ADDR2) & AC97_BUSY)
if ((YREAD2(sc, AC97_STAT_ADDR1) & AC97_BUSY) == 0)
if ((YREAD2(sc->sc, sc->status_addr) & AC97_BUSY) == 0)