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| author | Geert Uytterhoeven <geert+renesas@glider.be> | 2014-06-02 15:38:17 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@linaro.org> | 2014-06-02 15:49:35 +0100 |
| commit | 4f12b5e529e4ff274eb478ec1c2ef41358ed9577 (patch) | |
| tree | 20d86f05f6256125bc0004ec57da9d0be3b4cc7b /drivers/spi/spi-rspi.c | |
| parent | 03e627c55752fa434d5b3eba5ee3e489c51672b6 (diff) | |
| download | linux-4f12b5e529e4ff274eb478ec1c2ef41358ed9577.tar.gz linux-4f12b5e529e4ff274eb478ec1c2ef41358ed9577.tar.bz2 linux-4f12b5e529e4ff274eb478ec1c2ef41358ed9577.zip | |
spi: rspi: Add DMA support for QSPI on R-Car Gen2
Enable DMA support for QSPI on R-Car Gen2, for Single, Dual, and Quad SPI
Transfers.
Performance figures for reading from a QSPI FLASH driven at 24.375 MHz
on r8a7791/koelsch:
- Single: 1.1 Mbps PIO, 23 Mbps DMA
- Dual : 12.7 Mbps PIO, 48 Mbps DMA
- Quad : 13 Mbps PIO, 70 Mbps DMA
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Mark Brown <broonie@linaro.org>
Diffstat (limited to 'drivers/spi/spi-rspi.c')
| -rw-r--r-- | drivers/spi/spi-rspi.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/spi/spi-rspi.c b/drivers/spi/spi-rspi.c index b7f8be81423b..bec81470dd9c 100644 --- a/drivers/spi/spi-rspi.c +++ b/drivers/spi/spi-rspi.c @@ -642,6 +642,9 @@ static int qspi_transfer_out_in(struct rspi_data *rspi, 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; @@ -656,6 +659,9 @@ static int qspi_transfer_out(struct rspi_data *rspi, struct spi_transfer *xfer) { int ret; + if (rspi->master->can_dma && __rspi_can_dma(rspi, xfer)) + return rspi_dma_transfer(rspi, &xfer->tx_sg, NULL); + ret = rspi_pio_transfer(rspi, xfer->tx_buf, NULL, xfer->len); if (ret < 0) return ret; @@ -668,6 +674,9 @@ 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) { + if (rspi->master->can_dma && __rspi_can_dma(rspi, xfer)) + return rspi_dma_transfer(rspi, NULL, &xfer->rx_sg); + return rspi_pio_transfer(rspi, NULL, xfer->rx_buf, xfer->len); } |