rx_doorbell
bus_addr_t rx_doorbell;
rx->rx_doorbell = MCX_WQ_DOORBELL_BASE +
rx->rx_doorbell);
rx->rx_doorbell, sizeof(uint32_t), BUS_DMASYNC_PREWRITE);
rx->rx_doorbell, sizeof(uint32_t), BUS_DMASYNC_POSTWRITE);
rx->rx_doorbell, sizeof(uint32_t), BUS_DMASYNC_POSTWRITE);
htobem32(MCX_DMA_OFF(&sc->sc_doorbell_mem, rx->rx_doorbell),
rx->rx_doorbell, sizeof(uint32_t), BUS_DMASYNC_PREWRITE);