On Wed, Sep 26, 2012 at 08:26:19AM +0000, Hebbar, Gururaja wrote: > On Fri, Sep 21, 2012 at 23:52:11, Porter, Matt wrote: > > 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. > > Yesterday I tested edma patches on latest linux-next/master + merge of > linux-omap/for_3.7/dts_part2. Below are my observations > > 1. baseline = linux-next/master + merge of linux-omap/for_3.7/dts_part2 > 2. on top of above branch, I applied patches [1-9]/13 of your edma > patches > 3. few patches required trivial changes before applying > 4. Applied dma of patches as you mentioned > 5. add custom patch (ARM: CUSTOM: Build a uImage with dtb already > appended) > From https://github.com/hvaibhav/am335x-linux/commit/ > 7e72f5ed4b702c9373d19f7626f07ae31a381d53#arch/arm/Makefile Alternatively you can run a current u-boot master build for am335x and the appended dtb is no longer required. > 6. Modified 9/13 patch to apply properly on latest am33xx.dtsi. > a. Edma portion as it is > b. mmc portion as below > mmc1: mmc@48060000 { > compatible = "ti,omap3-hsmmc"; > ti,hwmods = "mmc1"; > ti,dual-volt; > ti,needs-special-reset; > bus-width = <4>; > vmmc-supply = <&vmmc_reg>; > dmas = <&edma 24 > &edma 25>; > dma-names = "tx", "rx"; > }; > c. added mmc pinmux as-well > > 7. make CROSS_COMPILE=arm-arago-linux-gnueabi- ARCH=arm distclean > make CROSS_COMPILE=arm-arago-linux-gnueabi- ARCH=arm > omap2plus_defconfig > > 8. enabled TI_EDMA from menuconfig (since it was not enabled for > omap2plus_defconfig > > 9. make CROSS_COMPILE=arm-arago-linux-gnueabi- ARCH=arm uImage > make CROSS_COMPILE=arm-arago-linux-gnueabi- ARCH=arm > uImage-dtb.am335x-evm > > With above changes, edma probe was failing at request_mem_region() > Inside linux-next/arch/arm/common/edma.c --> edma_probe() > > I had to modify edma_probe as below > > > diff --git a/arch/arm/common/edma.c b/arch/arm/common/edma.c > index f337f81..efe2673 100644 > --- a/arch/arm/common/edma.c > +++ b/arch/arm/common/edma.c > @@ -1589,11 +1589,11 @@ static int __init edma_probe(struct platform_device *pdev) > for (j = 0; j < EDMA_MAX_CC; j++) { > if (node) { > int err; > - err = of_address_to_resource(node, 0, &res[j]); > + err = of_address_to_resource(node, j, &res[j]); > if (err) { > dev_err(dev, > "unable to find 'reg' property\n"); > - return -EIO; > + //return -EIO; > } > r[j] = &res[j]; Hrm, looks like a dts issue if it can't find the reg resource on your integration of this. In any case, I'll look at it in v2. > With this I was able to boot on am335x-evm and do a successful MMC > copy-md5sum-compare test. Great! Thanks for testing this. > I believe you are looking into above issue in your v2 version. Yes. -Matt -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
