ISMT_MSTR_MCTRL
val = bus_read_4(sc->mmio_res, ISMT_MSTR_MCTRL);
bus_write_4(sc->mmio_res, ISMT_MSTR_MCTRL, val);
val = bus_read_4(sc->mmio_res, ISMT_MSTR_MCTRL);
bus_write_4(sc->mmio_res, ISMT_MSTR_MCTRL, val);
bus_write_4(sc->mmio_res, ISMT_MSTR_MCTRL, ISMT_MCTRL_MEIE);