ATW_BBPCTL_WR
if (ATW_ISSET(sc, ATW_BBPCTL, ATW_BBPCTL_WR) == 0)
if (ATW_ISSET(sc, ATW_BBPCTL, ATW_BBPCTL_RD | ATW_BBPCTL_WR)
sc->sc_bbpctl_wr = reg | ATW_BBPCTL_WR;