Arria10 SOC Linux driver for HPS DMA Controller?

[dudu1102]

Hi ,

I’m using Arria10 SOCFPGA with Linux Kenrel （branch aletra 4.14 ）.

In my application, there‘re bulks of data moving from one place to another place every 1ms，currently I have to use memcpy() which occupys CPU heavily.

​Is there any example to use HPS DMA Controller to implement this data moving, to avoid use cpu memcpy() . Any code example ?

Thanks for help

[JanKonecny]

Hello @dudu1102,
You are looking for Linux DMA Engine. Information sources are:

• https://www.kernel.org/doc/html/latest/driver-api/dmaengine/client.html
• https://elixir.bootlin.com/linux/latest/source/Documentation/devicetree/bindings/dma/dma.txt
• https://github.com/robertofem/CycloneVSoC-examples/blob/master/Linux-modules/DMA_PL330_LKM_basic/DMA_PL330_LKM_basic.c.

The last one is very good code example from @roberbot. You could also find older discusions about DMA, e.g. Using HPS DMA in De1-SoC.
Hope this help You a bit.
Yours sincerely
Jan Konečný.

[dudu1102]

Hello @Jan Konecny

Appreciate your kindly help. I will check these materials. Best Regards