SUN4I_INT_STA_REG
sun4i_spi_write(sspi, SUN4I_INT_STA_REG, ~0);
u32 status = sun4i_spi_read(sspi, SUN4I_INT_STA_REG);
sun4i_spi_write(sspi, SUN4I_INT_STA_REG, SUN4I_INT_CTL_TC);
sun4i_spi_write(sspi, SUN4I_INT_STA_REG, SUN4I_INT_CTL_RF_F34);
sun4i_spi_write(sspi, SUN4I_INT_STA_REG, SUN4I_INT_CTL_TF_E34);