| From 019e3a201fcc178b58e63806c37353e7055df877 Mon Sep 17 00:00:00 2001 |
| From: Geert Uytterhoeven <geert+renesas@glider.be> |
| Date: Mon, 2 Jun 2014 15:38:17 +0200 |
| Subject: 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> |
| (cherry picked from commit 4f12b5e529e4ff274eb478ec1c2ef41358ed9577) |
| Signed-off-by: Simon Horman <horms+renesas@verge.net.au> |
| --- |
| drivers/spi/spi-rspi.c | 9 +++++++++ |
| 1 file changed, 9 insertions(+) |
| |
| 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); |
| } |
| |
| -- |
| 2.1.2 |
| |
