AW_SPI_GCR
reg = AW_SPI_READ_4(sc, AW_SPI_GCR);
AW_SPI_WRITE_4(sc, AW_SPI_GCR, reg);
reg = AW_SPI_READ_4(sc, AW_SPI_GCR);
AW_SPI_WRITE_4(sc, AW_SPI_GCR, reg);
reg = AW_SPI_READ_4(sc, AW_SPI_GCR);
AW_SPI_WRITE_4(sc, AW_SPI_GCR, reg);