From 1e1cfc7213a37131a53e7dfada75dce77b8e043d Mon Sep 17 00:00:00 2001 From: Linus Walleij Date: Sat, 20 May 2017 23:42:53 +0200 Subject: dmaengine: pl08x: Add support for Faraday Technology FTDMAC020 After reading the specs for the Faraday Technology FTDMAC020 found in the Gemini platform, it becomes pretty evident that this is just another PL08x derivative, and should be handled like such by simply extending the existing PL08x driver to handle the quirks in this hardware. This patch makes memcpy work and has been tested on the Gemini and also regression-tested on the Nomadik NHK15 using dmatest with 10 threads per channel without a hinch for hours. I have not implemented slave DMA in those codepaths, because this device (Gemini) does not use slave DMA, and it seems like devices using FTDMAC020 for device DMA have a slightly different register layout so some real hardware is needed to proceed with this. I left some FIXME etc in the code for this. I had to do some refactorings of some helper functions, but I have not split those into separate patches because these refactorings do not make much sense without the increased complexity of handling the FTDMAC020. The DMA test would hang the platform on me on the Gemini after a few thousand iterations, however after turning of the caches the problem immediately disappeared and I could run the DMA engine with 10 threads pers physical channel for days in a row without a crash. I think there is no problem with the DMA driver: instead it is something fishy in the FA526 cache handling code that get pretty heavily exercised by the DMA engine and we need to go and fix that instead. Signed-off-by: Linus Walleij Signed-off-by: Vinod Koul --- drivers/dma/Kconfig | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'drivers/dma/Kconfig') diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig index 24e8597b2c3e..67ab15aa98c3 100644 --- a/drivers/dma/Kconfig +++ b/drivers/dma/Kconfig @@ -62,8 +62,10 @@ config AMBA_PL08X select DMA_ENGINE select DMA_VIRTUAL_CHANNELS help - Platform has a PL08x DMAC device - which can provide DMA engine support + Say yes if your platform has a PL08x DMAC device which can + provide DMA engine support. This includes the original ARM + PL080 and PL081, Samsungs PL080 derivative and Faraday + Technology's FTDMAC020 PL080 derivative. config AMCC_PPC440SPE_ADMA tristate "AMCC PPC440SPe ADMA support" -- cgit v1.2.3