GPIO_PBCON
reg = bus_space_read_4(s3sc->sc_iot, s3sc->sc_gpio_ioh, GPIO_PBCON);
bus_space_write_4(s3sc->sc_iot, s3sc->sc_gpio_ioh, GPIO_PBCON, reg);
reg = bus_space_read_4(iot, gpioh, GPIO_PBCON);
bus_space_write_4(iot, gpioh, GPIO_PBCON, reg);
IOW(S3C2410_GPIO_BASE+GPIO_PBCON, _C(_,_,_,_,_,I,O,I,O,I,O,O,O,O,O,O));