ENETC_TBMR
enetc_txbdr_wr(hw, idx, ENETC_TBMR, tbmr);
tbmr = enetc_txbdr_rd(hw, idx, ENETC_TBMR);
enetc_txbdr_wr(hw, idx, ENETC_TBMR, tbmr);
enetc_txbdr_wr(hw, idx, ENETC_TBMR, 0);
ENETC_TBMR, ENETC_TBSR, ENETC_TBBAR0, ENETC_TBBAR1,
u32 val = enetc_txbdr_rd(hw, idx, ENETC_TBMR);
enetc_txbdr_wr(hw, idx, ENETC_TBMR, val);
u32 val = enetc_txbdr_rd(hw, bdr_idx, ENETC_TBMR);
enetc_txbdr_wr(hw, bdr_idx, ENETC_TBMR, val);