From: Geert Uytterhoeven <geert+renesas@glider.be>
Date: Mon, 2 Jun 2014 13:38:17 +0000 (+0200)
Subject: spi: rspi: Add DMA support for QSPI on R-Car Gen2
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~39^2~29^2~1^4~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4f12b5e529e4ff274eb478ec1c2ef41358ed9577;p=pandora-kernel.git

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>
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