AW_SPI_FCR
AW_SPI_WRITE_4(sc, AW_SPI_FCR, AW_SPI_FCR_TX_RST | AW_SPI_FCR_RX_RST);
reg = AW_SPI_READ_4(sc, AW_SPI_FCR);
AW_SPI_WRITE_4(sc, AW_SPI_FCR,