spi: rspi: Extract rspi_common_transfer()

Extract the common parts of rspi_transfer_one(), rspi_rz_transfer_one(),
and qspi_transfer_out_in() into the new function rspi_common_transfer().

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Mark Brown <broonie@linaro.org>

1 files changed, 24 insertions, 37 deletions

diff --git a/drivers/spi/spi-rspi.c b/drivers/spi/spi-rspi.c
index 4bc4138e002b..10112745bb17 100644
--- a/drivers/spi/spi-rspi.c
+++ b/drivers/spi/spi-rspi.c
@@ -586,12 +586,32 @@ static bool rspi_can_dma(struct spi_master *master, struct spi_device *spi,
         return __rspi_can_dma(rspi, xfer);
 }
 
+static int rspi_common_transfer(struct rspi_data *rspi,
+                                struct spi_transfer *xfer)
+{
+        int ret;
+
+        if (rspi->master->can_dma && __rspi_can_dma(rspi, xfer)) {
+                /* rx_buf can be NULL on RSPI on SH in TX-only Mode */
+                return rspi_dma_transfer(rspi, &xfer->tx_sg,
+                                         xfer->rx_buf ? &xfer->rx_sg : NULL);
+        }
+
+        ret = rspi_pio_transfer(rspi, xfer->tx_buf, xfer->rx_buf, xfer->len);
+        if (ret < 0)
+                return ret;
+
+        /* Wait for the last transmission */
+        rspi_wait_for_tx_empty(rspi);
+
+        return 0;
+}
+
 static int rspi_transfer_one(struct spi_master *master, struct spi_device *spi,
                              struct spi_transfer *xfer)
 {
         struct rspi_data *rspi = spi_master_get_devdata(master);
         u8 spcr;
-        int ret;
 
         spcr = rspi_read8(rspi, RSPI_SPCR);
         if (xfer->rx_buf) {
@@ -602,18 +622,7 @@ static int rspi_transfer_one(struct spi_master *master, struct spi_device *spi,
         }
         rspi_write8(rspi, spcr, RSPI_SPCR);
 
-        if (master->can_dma && __rspi_can_dma(rspi, xfer))
-                return rspi_dma_transfer(rspi, &xfer->tx_sg,
-                                         xfer->rx_buf ? &xfer->rx_sg : NULL);
-
-        ret = rspi_pio_transfer(rspi, xfer->tx_buf, xfer->rx_buf, xfer->len);
-        if (ret < 0)
-                return ret;
-
-        /* Wait for the last transmission */
-        rspi_wait_for_tx_empty(rspi);
-
-        return 0;
+        return rspi_common_transfer(rspi, xfer);
 }
 
 static int rspi_rz_transfer_one(struct spi_master *master,
@@ -625,37 +634,15 @@ static int rspi_rz_transfer_one(struct spi_master *master,
 
         rspi_rz_receive_init(rspi);
 
-        if (master->can_dma && __rspi_can_dma(rspi, xfer))
-                return rspi_dma_transfer(rspi, &xfer->tx_sg, &xfer->rx_sg);
-
-        ret = rspi_pio_transfer(rspi, xfer->tx_buf, xfer->rx_buf, xfer->len);
-        if (ret < 0)
-                return ret;
-
-        /* Wait for the last transmission */
-        rspi_wait_for_tx_empty(rspi);
-
-        return 0;
+        return rspi_common_transfer(rspi, xfer);
 }
 
 static int qspi_transfer_out_in(struct rspi_data *rspi,
                                 struct spi_transfer *xfer)
 {
-        int ret;
-
         qspi_receive_init(rspi);
 
-        if (rspi->master->can_dma && __rspi_can_dma(rspi, xfer))
-                return rspi_dma_transfer(rspi, &xfer->tx_sg, &xfer->rx_sg);
-
-        ret = rspi_pio_transfer(rspi, xfer->tx_buf, xfer->rx_buf, xfer->len);
-        if (ret < 0)
-                return ret;
-
-        /* Wait for the last transmission */
-        rspi_wait_for_tx_empty(rspi);
-
-        return 0;
+        return rspi_common_transfer(rspi, xfer);
 }
 
 static int qspi_transfer_out(struct rspi_data *rspi, struct spi_transfer *xfer)