On Mon, Aug 1, 2016 at 9:25 AM, Peter Ujfalusi <peter.ujfalusi@xxxxxx> wrote: > 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. Hi, I try to use dmaengine (using dart board), with dmatest.ko, but seems that nothing happens because /sys/class/dma is empty. Is there a way to register the dma channels (using dart board file probably) so that they appear ? Regards, Ran >> >>> >>> > 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
