diff options
author | Geert Uytterhoeven <geert+renesas@glider.be> | 2014-06-02 15:38:07 +0200 |
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committer | Mark Brown <broonie@linaro.org> | 2014-06-02 15:49:33 +0100 |
commit | 6837b8e91d2a080293c30d5fe42d9692390091fa (patch) | |
tree | 81a3f605a81ff224e0267364461245c47cf2d85d /drivers | |
parent | b42e03596db3d45980c976c8124fdc323f031dc4 (diff) | |
download | op-kernel-dev-6837b8e91d2a080293c30d5fe42d9692390091fa.zip op-kernel-dev-6837b8e91d2a080293c30d5fe42d9692390091fa.tar.gz |
spi: rspi: Extract rspi_pio_transfer()
The various PIO loops are very similar. Consolidate into a single
function rspi_pio_transfer().
Both buffer pointers can be NULL, as RSPI supports TX-only mode, and
Dual/Quad SPI Transfers are unidirectional.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Mark Brown <broonie@linaro.org>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/spi/spi-rspi.c | 95 |
1 files changed, 33 insertions, 62 deletions
diff --git a/drivers/spi/spi-rspi.c b/drivers/spi/spi-rspi.c index ece8f60..fdbd46d 100644 --- a/drivers/spi/spi-rspi.c +++ b/drivers/spi/spi-rspi.c @@ -438,15 +438,24 @@ static int rspi_data_in(struct rspi_data *rspi) return data; } -static int rspi_data_out_in(struct rspi_data *rspi, u8 data) +static int rspi_pio_transfer(struct rspi_data *rspi, const u8 *tx, u8 *rx, + unsigned int n) { - int ret; - - ret = rspi_data_out(rspi, data); - if (ret < 0) - return ret; + while (n-- > 0) { + if (tx) { + int ret = rspi_data_out(rspi, *tx++); + if (ret < 0) + return ret; + } + if (rx) { + int ret = rspi_data_in(rspi); + if (ret < 0) + return ret; + *rx++ = ret; + } + } - return rspi_data_in(rspi); + return 0; } static void rspi_dma_complete(void *arg) @@ -644,13 +653,11 @@ static int rspi_is_dma(const struct rspi_data *rspi, struct spi_transfer *t) 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; + int ret; spcr = rspi_read8(rspi, RSPI_SPCR); - if (rx_buf) { + if (xfer->rx_buf) { rspi_receive_init(rspi); spcr &= ~SPCR_TXMD; } else { @@ -658,18 +665,9 @@ static int rspi_transfer_out_in(struct rspi_data *rspi, } rspi_write8(rspi, spcr, RSPI_SPCR); - while (remain > 0) { - ret = rspi_data_out(rspi, *tx_buf++); - if (ret < 0) - return ret; - if (rx_buf) { - ret = rspi_data_in(rspi); - if (ret < 0) - return ret; - *rx_buf++ = ret; - } - remain--; - } + 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); @@ -694,19 +692,13 @@ static int rspi_transfer_one(struct spi_master *master, struct spi_device *spi, static int rspi_rz_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; + int ret; rspi_rz_receive_init(rspi); - while (remain > 0) { - ret = rspi_data_out_in(rspi, *tx_buf++); - if (ret < 0) - return ret; - *rx_buf++ = ret; - remain--; - } + 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); @@ -726,19 +718,13 @@ static int rspi_rz_transfer_one(struct spi_master *master, static int qspi_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; + int ret; qspi_receive_init(rspi); - while (remain > 0) { - ret = rspi_data_out_in(rspi, *tx_buf++); - if (ret < 0) - return ret; - *rx_buf++ = ret; - remain--; - } + 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); @@ -748,15 +734,11 @@ static int qspi_transfer_out_in(struct rspi_data *rspi, static int qspi_transfer_out(struct rspi_data *rspi, struct spi_transfer *xfer) { - const u8 *buf = xfer->tx_buf; - unsigned int i; int ret; - for (i = 0; i < xfer->len; i++) { - ret = rspi_data_out(rspi, *buf++); - if (ret < 0) - return ret; - } + ret = rspi_pio_transfer(rspi, xfer->tx_buf, NULL, xfer->len); + if (ret < 0) + return ret; /* Wait for the last transmission */ rspi_wait_for_tx_empty(rspi); @@ -766,18 +748,7 @@ static int qspi_transfer_out(struct rspi_data *rspi, struct spi_transfer *xfer) static int qspi_transfer_in(struct rspi_data *rspi, struct spi_transfer *xfer) { - u8 *buf = xfer->rx_buf; - unsigned int i; - int ret; - - for (i = 0; i < xfer->len; i++) { - ret = rspi_data_in(rspi); - if (ret < 0) - return ret; - *buf++ = ret; - } - - return 0; + return rspi_pio_transfer(rspi, NULL, xfer->rx_buf, xfer->len); } static int qspi_transfer_one(struct spi_master *master, struct spi_device *spi, |