ENETC_PORT_BASE
bus_read_8((sc)->regs, ENETC_PORT_BASE + (reg))
bus_read_4((sc)->regs, ENETC_PORT_BASE + (reg))
bus_write_4((sc)->regs, ENETC_PORT_BASE + (reg), value)
bus_read_2((sc)->regs, ENETC_PORT_BASE + (reg))
bus_write_2((sc)->regs, ENETC_PORT_BASE + (reg), value)
val = enetc_mdio_read(sc->regs, ENETC_PORT_BASE + ENETC_EMDIO_BASE,
ret = enetc_mdio_write(sc->regs, ENETC_PORT_BASE + ENETC_EMDIO_BASE,