From: Geert Uytterhoeven <[email protected]> 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 <[email protected]> --- drivers/spi/spi-rspi.c | 79 +++++++++++++++++------------------------------- 1 file 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) -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
