spi: rspi: Merge rspi_send_pio() and rspi_receive_pio()
rspi_send_pio() and rspi_receive_pio() are very similar:
- the former only sends data, using TX Only Mode,
- the latter sends and receives full duplex data to/from the hardware,
but uses dummy transmit data.
Merge them into rspi_transfer_out_in(), now supporting full duplex if
needed.
Signed-off-by: Geert Uytterhoeven <geert+renesas@linux-m68k.org>
Signed-off-by: Mark Brown <broonie@linaro.org>
diff --git a/drivers/spi/spi-rspi.c b/drivers/spi/spi-rspi.c
index d837c50..cc90136 100644
--- a/drivers/spi/spi-rspi.c
+++ b/drivers/spi/spi-rspi.c
@@ -389,27 +389,6 @@
return rspi_data_in(rspi);
}
-static int rspi_send_pio(struct rspi_data *rspi, struct spi_transfer *t)
-{
- int remain = t->len, ret;
- const u8 *data = t->tx_buf;
-
- while (remain > 0) {
- rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) | SPCR_TXMD,
- RSPI_SPCR);
-
- ret = rspi_data_out(rspi, *data++);
- if (ret < 0)
- return ret;
- remain--;
- }
-
- /* Waiting for the last transmission */
- rspi_wait_for_interrupt(rspi, SPSR_SPTEF, SPCR_SPTIE);
-
- return 0;
-}
-
static int qspi_send_pio(struct rspi_data *rspi, struct spi_transfer *t)
{
int remain = t->len, ret;
@@ -563,28 +542,6 @@
RSPI_SPSR);
}
-static int rspi_receive_pio(struct rspi_data *rspi, struct spi_transfer *t)
-{
- int remain = t->len, ret;
- u8 *data = t->rx_buf;
-
- rspi_receive_init(rspi);
-
- while (remain > 0) {
- rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) & ~SPCR_TXMD,
- RSPI_SPCR);
-
- /* dummy write data for generate clock */
- ret = rspi_data_out_in(rspi, DUMMY_DATA);
- if (ret < 0)
- return ret;
- *data++ = ret;
- remain--;
- }
-
- return 0;
-}
-
static void qspi_receive_init(const struct rspi_data *rspi)
{
u8 spsr;
@@ -729,27 +686,61 @@
return 0;
}
+static int rspi_transfer_out_in(struct rspi_data *rspi,
+ struct spi_transfer *xfer)
+{
+ int remain = xfer->len, ret;
+ const u8 *tx_buf = xfer->tx_buf;
+ u8 *rx_buf = xfer->rx_buf;
+ u8 spcr, data;
+
+ rspi_receive_init(rspi);
+
+ spcr = rspi_read8(rspi, RSPI_SPCR);
+ if (rx_buf)
+ spcr &= ~SPCR_TXMD;
+ else
+ spcr |= SPCR_TXMD;
+ rspi_write8(rspi, spcr, RSPI_SPCR);
+
+ while (remain > 0) {
+ data = tx_buf ? *tx_buf++ : DUMMY_DATA;
+ ret = rspi_data_out(rspi, data);
+ if (ret < 0)
+ return ret;
+ if (rx_buf) {
+ ret = rspi_data_in(rspi);
+ if (ret < 0)
+ return ret;
+ *rx_buf++ = ret;
+ }
+ remain--;
+ }
+
+ /* Wait for the last transmission */
+ rspi_wait_for_interrupt(rspi, SPSR_SPTEF, SPCR_SPTIE);
+
+ 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);
- int ret = 0;
+ int ret;
+
+ if (!rspi_is_dma(rspi, xfer))
+ return rspi_transfer_out_in(rspi, xfer);
if (xfer->tx_buf) {
- if (rspi_is_dma(rspi, xfer))
- ret = rspi_send_dma(rspi, xfer);
- else
- ret = rspi_send_pio(rspi, xfer);
+ ret = rspi_send_dma(rspi, xfer);
if (ret < 0)
return ret;
}
- if (xfer->rx_buf) {
- if (rspi_is_dma(rspi, xfer))
- ret = rspi_receive_dma(rspi, xfer);
- else
- ret = rspi_receive_pio(rspi, xfer);
- }
- return ret;
+ if (xfer->rx_buf)
+ return rspi_receive_dma(rspi, xfer);
+
+ return 0;
}
static int qspi_transfer_one(struct spi_master *master, struct spi_device *spi,