tested-by: Prakash Burla <prakash.burla@xxxxxxxxxxxxxxx> This driver is tested on IFC6410. > > From: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx> > Date: Fri, Jul 11, 2014 at 5:18 PM > Subject: [RFC PATCH] mmc: mmci: Add qcom dml support to the driver. > To: linux-mmc@xxxxxxxxxxxxxxx > Cc: Linus Walleij <linus.walleij@xxxxxxxxxx>, Chris Ball > <chris@xxxxxxxxxx>, Ulf Hansson <ulf.hansson@xxxxxxxxxx>, Russell King > <linux@xxxxxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, Srinivas > Kandagatla <srinivas.kandagatla@xxxxxxxxxx> > > > On Qualcomm APQ8064 SOCs, SD card controller has an additional glue > called DML (Data Mover Local/Lite) to assist dma transfers. > This hardware needs to be setup before any dma transfer is requested. > DML itself is not a DMA engine, its just a gule between the SD card > controller and dma controller. > > Most of this code has been ported from qualcomm's 3.4 kernel. > > This patch adds the code necessary to intialize the hardware and setup > before doing any dma transfers. > > Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx> > --- > > Hi All, > > DMA support for Qualcomm SD card controller is missing in my last patchset, the > reason to post this patch separately is because of the unusual glue logic > between card controller and the dma-controller. This glue logic is called DML > (Data mover local/lite). > > DML assists dma transfers between sd card controller and dma-controller. As this > DML gule is part of SD controller IP and needs configuring for every transfer, > So I thought of keeping it close to driver in drivers/mmc/ directory is more > usefull, than trying to find a infrastructure to fit it. DML itself is not a DMA > controller but an logic present on SD card controller and it resides in SD card > controller IP. > > I would like to get your opnion on overall correctness of the approch. > > Thanks in advance. > srini > > > drivers/mmc/host/Kconfig | 11 +++ > drivers/mmc/host/Makefile | 1 + > drivers/mmc/host/mmci.c | 19 ++++- > drivers/mmc/host/qcom_dml.c | 171 ++++++++++++++++++++++++++++++++++++++++++++ > drivers/mmc/host/qcom_dml.h | 17 +++++ > 5 files changed, 218 insertions(+), 1 deletion(-) > create mode 100644 drivers/mmc/host/qcom_dml.c > create mode 100644 drivers/mmc/host/qcom_dml.h > . [SNIP] . > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > > -- 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
