PTIMER_CTRL
bus_space_write_4(sc->sc_iot, sc->sc_pioh, PTIMER_CTRL, 0);
reg = bus_space_read_4(sc->sc_iot, sc->sc_pioh, PTIMER_CTRL);
bus_space_write_4(sc->sc_iot, sc->sc_pioh, PTIMER_CTRL,
bus_space_write_4(sc->sc_iot, sc->sc_pioh, PTIMER_CTRL,