spi: rspi: Add DMA support for QSPI on R-Car Gen2

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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>

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Geert Uytterhoeven 2014-06-02 15:38:17 +02:00 • committed by Mark Brown

parent 03e627c557

commit 4f12b5e529

1 changed files with 9 additions and 0 deletions

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drivers/spi/spi-rspi.c

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