BWI_MAC_GPIO_CTRL
val = CSR_READ_2(sc, BWI_MAC_GPIO_CTRL);
CSR_WRITE_2(sc, BWI_MAC_GPIO_CTRL, val);
val = CSR_READ_2(sc, BWI_MAC_GPIO_CTRL);
CSR_WRITE_2(sc, BWI_MAC_GPIO_CTRL, val);
val = CSR_READ_2(sc, BWI_MAC_GPIO_CTRL);
CSR_WRITE_2(sc, BWI_MAC_GPIO_CTRL, val);