RTSX_HAIMR
WRITE4(sc, RTSX_HAIMR, RTSX_HAIMR_BUSY |
reg = READ4(sc, RTSX_HAIMR);
WRITE4(sc, RTSX_HAIMR,
reg = READ4(sc, RTSX_HAIMR);
sc->regs4[4] = READ4(sc, RTSX_HAIMR);
WRITE4(sc, RTSX_HAIMR, sc->regs4[4]);