MCSPI_IRQSTATUS
TI_SPI_WRITE(sc, MCSPI_IRQSTATUS, 0xffff);
TI_SPI_WRITE(sc, MCSPI_IRQSTATUS, 0xffff);
status = TI_SPI_READ(sc, MCSPI_IRQSTATUS);
TI_SPI_WRITE(sc, MCSPI_IRQSTATUS, status);
TI_SPI_WRITE(sc, MCSPI_IRQSTATUS, 0xf);
reg = TI_SPI_READ(sc, MCSPI_IRQSTATUS);