spin_unlock_irqrestore(&sdd->lock, flags);
 }
 
-static int prepare_dma(struct s3c64xx_spi_dma_data *dma,
-                       struct sg_table *sgt)
+static int s3c64xx_prepare_dma(struct s3c64xx_spi_dma_data *dma,
+                              struct sg_table *sgt)
 {
        struct s3c64xx_spi_driver_data *sdd;
        struct dma_slave_config config;
                chcfg |= S3C64XX_SPI_CH_TXCH_ON;
                if (dma_mode) {
                        modecfg |= S3C64XX_SPI_MODE_TXDMA_ON;
-                       ret = prepare_dma(&sdd->tx_dma, &xfer->tx_sg);
+                       ret = s3c64xx_prepare_dma(&sdd->tx_dma, &xfer->tx_sg);
                } else {
                        switch (sdd->cur_bpw) {
                        case 32:
                        writel(((xfer->len * 8 / sdd->cur_bpw) & 0xffff)
                                        | S3C64XX_SPI_PACKET_CNT_EN,
                                        regs + S3C64XX_SPI_PACKET_CNT);
-                       ret = prepare_dma(&sdd->rx_dma, &xfer->rx_sg);
+                       ret = s3c64xx_prepare_dma(&sdd->rx_dma, &xfer->rx_sg);
                }
        }