IPD_CTL_STATUS_OFFSET
ctl_status = _IPD_RD8(sc, IPD_CTL_STATUS_OFFSET);
_IPD_WR8(sc, IPD_CTL_STATUS_OFFSET, ctl_status);
ctl_status = _IPD_RD8(sc, IPD_CTL_STATUS_OFFSET);
_IPD_WR8(sc, IPD_CTL_STATUS_OFFSET, ctl_status);