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author | Geert Uytterhoeven <geert+renesas@linux-m68k.org> | 2014-01-24 09:43:57 +0100 |
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committer | Mark Brown <broonie@linaro.org> | 2014-01-27 21:02:10 +0100 |
commit | 340a15e6f0d6cd436c55693f7328a1de02fcdb96 (patch) | |
tree | d31b1ad41c22494b94114081001131ad404dd9ab /drivers/spi/spi-rspi.c | |
parent | spi: rspi: Merge rspi_send_pio() and rspi_receive_pio() (diff) | |
download | linux-340a15e6f0d6cd436c55693f7328a1de02fcdb96.tar.xz linux-340a15e6f0d6cd436c55693f7328a1de02fcdb96.zip |
spi: rspi: Merge qspi_send_pio() and qspi_receive_pio()
qspi_send_pio() and qspi_receive_pio() are very similar: they both send
and receive full duplex data to/from the hardware, but ignore the data
stream in the unused direction.
Merge them into qspi_transfer_out_in(), now supporting real full duplex.
Signed-off-by: Geert Uytterhoeven <geert+renesas@linux-m68k.org>
Signed-off-by: Mark Brown <broonie@linaro.org>
Diffstat (limited to 'drivers/spi/spi-rspi.c')
-rw-r--r-- | drivers/spi/spi-rspi.c | 79 |
1 files changed, 28 insertions, 51 deletions
diff --git a/drivers/spi/spi-rspi.c b/drivers/spi/spi-rspi.c index cc90136d02c8..5d39cd3eba62 100644 --- a/drivers/spi/spi-rspi.c +++ b/drivers/spi/spi-rspi.c @@ -389,28 +389,6 @@ static int rspi_data_out_in(struct rspi_data *rspi, u8 data) return rspi_data_in(rspi); } -static int qspi_send_pio(struct rspi_data *rspi, struct spi_transfer *t) -{ - int remain = t->len, ret; - const u8 *data = t->tx_buf; - - rspi_write8(rspi, SPBFCR_TXRST, QSPI_SPBFCR); - rspi_write8(rspi, 0x00, QSPI_SPBFCR); - - while (remain > 0) { - /* dummy read */ - ret = rspi_data_out_in(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 void rspi_dma_complete(void *arg) { struct rspi_data *rspi = arg; @@ -550,26 +528,7 @@ static void qspi_receive_init(const struct rspi_data *rspi) if (spsr & SPSR_SPRF) rspi_read_data(rspi); /* dummy read */ rspi_write8(rspi, SPBFCR_TXRST | SPBFCR_RXRST, QSPI_SPBFCR); - rspi_write8(rspi, 0x00, QSPI_SPBFCR); -} - -static int qspi_receive_pio(struct rspi_data *rspi, struct spi_transfer *t) -{ - int remain = t->len, ret; - u8 *data = t->rx_buf; - - qspi_receive_init(rspi); - - while (remain > 0) { - /* dummy write for generate clock */ - ret = rspi_data_out_in(rspi, DUMMY_DATA); - if (ret < 0) - return ret; - *data++ = ret; - remain--; - } - - return 0; + rspi_write8(rspi, 0, QSPI_SPBFCR); } static int rspi_receive_dma(struct rspi_data *rspi, struct spi_transfer *t) @@ -743,20 +702,38 @@ static int rspi_transfer_one(struct spi_master *master, struct spi_device *spi, return 0; } -static int qspi_transfer_one(struct spi_master *master, struct spi_device *spi, - struct spi_transfer *xfer) +static int qspi_transfer_out_in(struct rspi_data *rspi, + struct spi_transfer *xfer) { - struct rspi_data *rspi = spi_master_get_devdata(master); - int ret = 0; + int remain = xfer->len, ret; + const u8 *tx_buf = xfer->tx_buf; + u8 *rx_buf = xfer->rx_buf; + u8 data; - if (xfer->tx_buf) { - ret = qspi_send_pio(rspi, xfer); + qspi_receive_init(rspi); + + while (remain > 0) { + data = tx_buf ? *tx_buf++ : DUMMY_DATA; + ret = rspi_data_out_in(rspi, data); if (ret < 0) return ret; + if (rx_buf) + *rx_buf++ = ret; + remain--; } - if (xfer->rx_buf) - ret = qspi_receive_pio(rspi, xfer); - return ret; + + /* Wait for the last transmission */ + rspi_wait_for_interrupt(rspi, SPSR_SPTEF, SPCR_SPTIE); + + return 0; +} + +static int qspi_transfer_one(struct spi_master *master, struct spi_device *spi, + struct spi_transfer *xfer) +{ + struct rspi_data *rspi = spi_master_get_devdata(master); + + return qspi_transfer_out_in(rspi, xfer); } static int rspi_setup(struct spi_device *spi) |