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Message-ID: <20120921182211.GE16522@beef> Date: Fri, 21 Sep 2012 14:22:11 -0400 From: Matt Porter <mporter@...com> To: "Hebbar, Gururaja" <gururaja.hebbar@...com> Cc: Tony Lindgren <tony@...mide.com>, "Nori, Sekhar" <nsekhar@...com>, Grant Likely <grant.likely@...retlab.ca>, Mark Brown <broonie@...nsource.wolfsonmicro.com>, "Cousson, Benoit" <b-cousson@...com>, Russell King <linux@....linux.org.uk>, Vinod Koul <vinod.koul@...el.com>, Rob Landley <rob@...dley.net>, Chris Ball <cjb@...top.org>, Linux DaVinci Kernel List <davinci-linux-open-source@...ux.davincidsp.com>, Arnd Bergmann <arnd@...db.de>, Linux Documentation List <linux-doc@...r.kernel.org>, Devicetree Discuss <devicetree-discuss@...ts.ozlabs.org>, Linux MMC List <linux-mmc@...r.kernel.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Rob Herring <rob.herring@...xeda.com>, Dan Williams <djbw@...com>, Linux SPI Devel List <spi-devel-general@...ts.sourceforge.net>, Linux OMAP List <linux-omap@...r.kernel.org>, Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org> Subject: Re: [RFC PATCH 00/13] DMA Engine support for AM33xx On Fri, Sep 21, 2012 at 08:27:07AM +0000, Hebbar, Gururaja wrote: > On Thu, Sep 20, 2012 at 20:13:33, Porter, Matt wrote: > > This series adds DMA Engine support for AM33xx, which uses > > an EDMA DMAC. The EDMA DMAC has been previously supported by only > > a private API implementation (much like the situation with OMAP > > DMA) found on the DaVinci family of SoCs. > > > > There are a mind-boggling number of dependencies for this series: > > > > - Jon Hunter's OF DMA helpers series > > https://patchwork.kernel.org/patch/1461061/ > > https://patchwork.kernel.org/patch/1461051/ > > - Patch to address OF DMA helpers naming issues: > > https://patchwork.kernel.org/patch/1477921/ > > - EDMA DMA Engine wrapper driver in linux-next > > c2dde5f8f2095d7c623ff3565c1462e190272273 > > - EDMA DMA Engine wrapper driver bug fix: > > https://patchwork.kernel.org/patch/1474411/ > > - A huge number of patches in linux-next for AM33xx boot > > (too numerous to list) > > > > The approach taken is similar to how OMAP DMA is being converted to > > DMA Engine support. With the functional EDMA private API already > > existing in mach-davinci/dma.c, we first move that to an ARM common > > area so it can be shared. Adding DT and runtime PM support to the > > private EDMA API implementation allows it to run on AM33xx. AM33xx > > *only* boots using DT so we leverage Jon's generic DT DMA helpers to > > register EDMA DMAC with the of_dma framework and then add support > > for calling the dma_request_slave_channel() API to both the mmc > > and spi drivers. > > > > What works? Well, with this series we now have MMC and SPI support > > on AM33xx. The only caveat for MMC is that the mmc3 controller has > > its events on the crossbar and is not usable right now. > > > > This is tested on BeagleBone with a SPI framebuffer driver and SD > > card. > > > > After this series, the plan is to convert the last in-tree user > > of the private EDMA API (davinci-pcm/mcasp) and then eliminate > > the private EDMA API by folding its functionality into > > drivers/dma/edma.c. > > > > TODO: > > add AM33xx crossbar support to the private EDMA API > > (any EDMA events on the crossbar are not supported) > > > > > Can you please mention the base repo you have taken as starting point. > (repo + extra patches ...). It's mainline 3.6-rc6 and you can see the complete set of patches at https://github.com/ohporter/linux/tree/edma-dmaengine-am33xx-rfc-v1 after commit 5698bd757d55b1bb87edd1a9744ab09c142abfc2 > This will help us to test the code. > > This is because I looked at the patch 12/13 and I see that mmc > device-node is modified. But in mainline I don’t see device > node for mmc (yet). Oops. You'll need e62a3333ae450bcdefbe22229d7bc277ae0ef645 and fe97304557d2c6f7d0aaf1ea028ea48ffca366a9 which I forgot to include in this series. I'll have them in for v2. -Matt > > Matt Porter (13): > > ARM: davinci: move private EDMA API to arm/common > > ARM: edma: remove unused transfer controller handlers > > ARM: edma: add DT and runtime PM support for AM335x > > dmaengine: edma: enable build for AM335x > > dma: Add TI EDMA device tree binding > > ARM: omap: add hsmmc am33xx specific init > > mmc: omap_hsmmc: dma_request_slave_channel() support for DT platforms > > mmc: omap_hsmmc: limit max_segs with the EDMA DMAC > > mmc: omap_hsmmc: add generic DMA request support to the DT binding > > spi: omap2-mcspi: dma_request_slave_channel() support for DT > > platforms > > spi: omap2-mcspi: add generic DMA request support to the DT binding > > ARM: dts: add am33xx EDMA support > > Documentation: add schedule for removing private EDMA API > > > > Documentation/devicetree/bindings/dma/ti-edma.txt | 49 + > > .../devicetree/bindings/mmc/ti-omap-hsmmc.txt | 25 +- > > Documentation/devicetree/bindings/spi/omap-spi.txt | 27 +- > > Documentation/feature-removal-schedule.txt | 10 + > > arch/arm/Kconfig | 1 + > > arch/arm/boot/dts/am33xx.dtsi | 46 + > > arch/arm/common/Kconfig | 3 + > > arch/arm/common/Makefile | 1 + > > arch/arm/common/edma.c | 1779 ++++++++++++++++++++ > > arch/arm/include/asm/mach/edma.h | 267 +++ > > arch/arm/mach-davinci/Makefile | 2 +- > > arch/arm/mach-davinci/devices.c | 3 +- > > arch/arm/mach-davinci/dm355.c | 2 +- > > arch/arm/mach-davinci/dm365.c | 2 +- > > arch/arm/mach-davinci/dm644x.c | 2 +- > > arch/arm/mach-davinci/dm646x.c | 2 +- > > arch/arm/mach-davinci/dma.c | 1588 ----------------- > > arch/arm/mach-davinci/include/mach/asp.h | 2 +- > > arch/arm/mach-davinci/include/mach/da8xx.h | 3 +- > > arch/arm/mach-davinci/include/mach/edma.h | 267 --- > > arch/arm/mach-davinci/include/mach/spi.h | 2 +- > > arch/arm/mach-omap2/hsmmc.c | 7 +- > > arch/arm/plat-omap/Kconfig | 1 + > > drivers/dma/Kconfig | 2 +- > > drivers/dma/edma.c | 2 +- > > drivers/mmc/host/omap_hsmmc.c | 26 +- > > drivers/spi/spi-omap2-mcspi.c | 68 +- > > 27 files changed, 2296 insertions(+), 1893 deletions(-) > > create mode 100644 Documentation/devicetree/bindings/dma/ti-edma.txt > > create mode 100644 arch/arm/common/edma.c > > create mode 100644 arch/arm/include/asm/mach/edma.h > > delete mode 100644 arch/arm/mach-davinci/dma.c > > delete mode 100644 arch/arm/mach-davinci/include/mach/edma.h > > > > -- > > 1.7.9.5 > > > > _______________________________________________ > > Davinci-linux-open-source mailing list > > Davinci-linux-open-source@...ux.davincidsp.com > > http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source > > > > > Regards, > Gururaja > _______________________________________________ > Davinci-linux-open-source mailing list > Davinci-linux-open-source@...ux.davincidsp.com > http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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