GPIO_PECON
pecon = bus_space_read_4(iot, gpioh, GPIO_PECON);
bus_space_write_4(iot, gpioh, GPIO_PECON, pecon);
reg = bus_space_read_4(sc->sc_iot, sc->sc_gpio_ioh, GPIO_PECON);
bus_space_write_4(sc->sc_iot, sc->sc_gpio_ioh, GPIO_PECON, reg);
pecon = bus_space_read_4(iot, gpioh, GPIO_PECON);
bus_space_write_4(iot, gpioh, GPIO_PECON, pecon);
IOW(S3C2410_GPIO_BASE+GPIO_PECON, _C(A,A,A,A,A,A,A,A,A,A,A,A,A,A,A,A));