SPI_SPSTA
reg = bus_space_read_4(sc->iot, sc->ioh, SPI_SPSTA);
reg = bus_space_read_4(sc->iot, sc->ioh, SPI_SPSTA);
reg = bus_space_read_4(sc->iot, sc->ioh, SPI_SPSTA);
if (!(bus_space_read_1(sc->iot, sc->ioh, SPI_SPSTA) & SPSTA_REDY))