IWX_CSR_HW_REV_STEP
mac_step = IWX_CSR_HW_REV_STEP(sc->sc_hw_rev << 2);
(IWX_CSR_HW_REV_STEP(sc->sc_hw_rev << 2) << 2);
reg_val |= IWX_CSR_HW_REV_STEP(sc->sc_hw_rev) <<