On 07/30/16 17:07, Ran Shalit wrote: > > בתאריך 25 ביול 2016 09:49, "Peter Ujfalusi" <peter.ujfalusi@xxxxxx > <mailto:peter.ujfalusi@xxxxxx>> כתב: >> >> On 07/23/16 17:39, Ran Shalit wrote: >> > Hello, >> > >> > I try to use DMA in a ethernet driver I am writing (for OMAP4460). >> > I know there is the edma API which can be used with OMAP: >> > http://processors.wiki.ti.com/index.php/EDMA_sample_test_application >> >> eDMA is not available on OMAPs. We have sDMA (system DMA, or DMA4). >> >> > But on viewing the ethernet driver in the kernel tree, I can't find >> > anywhere using these APIs. >> > I assume there is some framework in between which is used instead (and >> > probably calls the edma APIs directly). >> > >> > 1. Do you think for simplicity I can use the edma APIs directly ? >> >> You should not use direct API. eDMA does not have it anymore and while sDMA >> still have legacy API, we are working on to remove it. > > Just for understanding, > What is these sDMA API? > I could not find these APIs. Please use dmaengine only. Avoid using the sDMA legacy API (include/linux/omap-dma.h) it is going to be removed hopefully sooner than later. >> Please use the dmaengine API to configure the DMA. This way your driver will >> be portable also. > >> >> > 2.Is there any example which shows how to use DMA (which shall call >> > the edma, and shall result in triggering a dma trsnaction in OMAP) ? >> >> git grep dmaengine_prep_dma_sg >> or >> git grep dmaengine_terminate_all >> >> will show you the drivers using dmaengine. >> >> -- >> Péter > -- Péter -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
