Hi Matt, On 23.08.2012 03:09, Matt Porter wrote: > This series begins the conversion of the DaVinci private EDMA API > implementation to a DMA engine driver and converts two of the three > in-kernel users of the private EDMA API to DMA engine. > > The approach taken is similar to the recent OMAP DMA Engine > conversion. The EDMA DMA Engine driver is a wrapper around the existing > private EDMA implementation and registers the platform device within > the driver. This allows the conversion series to stand alone with just > the drivers and no changes to platform code. It also allows peripheral > drivers to continue to use the private EDMA implementation until they > are converted. > > The EDMA DMA Engine driver supports slave transfers only at this time. It > is planned to add cyclic transfers in support of audio peripherals. > > There are three users of the private EDMA API in the kernel now: > davinci_mmc, spi-davinci, and davinci-mcasp. This series provides DMA > Engine conversions for the davinci_mmc and spi-davinci drivers which > use the supported slave transfers. > > This series has been tested on an AM18x EVM and Hawkboard with > driver performance comparable to that of the private EDMA API > implementations. Both MMC0 and MMC1 are tested which handles the > DA850/OMAP-L138/AM18x specific case where MMC1 uses DMA channels on > a second EDMA channel controller. All other platforms have a simpler > design with just a single EDMA channel controller. > > For those wanting to easily test this series, I've pushed a branch for > each version to my github tree at https://github.com/ohporter/linux. The > current branch is edma-dmaengine-v3. > > After this series, the current plan is to complete the mcasp driver > conversion which includes adding cyclic dma support. This will then > enable the removal and refactoring of the private EDMA API functionality > into the EDMA DMA Engine driver. Since EDMA is also used on the AM33xx > family of parts in mach-omap2/, the plan is to enable this driver on > that platform as well. Once you have a patch for the McASP driver conversion, I can happily test this on a AM33xx board, together with Gururaja's latest McASP refactoring series. Let me know how I can help you here. Thanks, Daniel -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
