linux-imx
Public
Source
committed 34b1fcaeb21x
spi_finalize_current_transfer(master); return ret;}static int a3700_spi_transfer_one_full_duplex(struct spi_master *master, struct spi_device *spi, struct spi_transfer *xfer){ struct a3700_spi *a3700_spi = spi_master_get_devdata(master); u32 val_in, val_out; u32 val; /* Disable FIFO mode */ a3700_spi_fifo_mode_set(a3700_spi, false); while (a3700_spi->buf_len) { /* When we have less than 4 bytes to transfer, switch to 1 byte * mode. This is reset after each transfer */ if (a3700_spi->buf_len < 4) a3700_spi_bytelen_set(a3700_spi, 1); if (a3700_spi->byte_len == 1) val_out = *a3700_spi->tx_buf; val = *a3700_spi->tx_buf; else val_out = cpu_to_le32(*(u32 *)a3700_spi->tx_buf); val = *(u32 *)a3700_spi->tx_buf; spireg_write(a3700_spi, A3700_SPI_DATA_OUT_REG, val_out); spireg_write(a3700_spi, A3700_SPI_DATA_OUT_REG, val); /* Wait for all the data to be shifted in / out */ while (!(spireg_read(a3700_spi, A3700_SPI_IF_CTRL_REG) & A3700_SPI_XFER_DONE)) cpu_relax(); val_in = le32_to_cpu(spireg_read(a3700_spi, A3700_SPI_DATA_IN_REG)); val = spireg_read(a3700_spi, A3700_SPI_DATA_IN_REG); memcpy(a3700_spi->rx_buf, &val_in, a3700_spi->byte_len); memcpy(a3700_spi->rx_buf, &val, a3700_spi->byte_len); a3700_spi->buf_len -= a3700_spi->byte_len; a3700_spi->tx_buf += a3700_spi->byte_len; a3700_spi->rx_buf += a3700_spi->byte_len; } spi_finalize_current_transfer(master); return 0;