[PATCH/RFC] ARM: Exynos4: Integrate IOMMU aware DMA-mapping

[Marek Szyprowski]

Hi!

This is an example of the IOMMU aware DMA-mapping implementation usage
on a Samsung Exynos4 based NURI board. The ARM DMA-mapping IOMMU aware
implementation is available in the [1] thread: 

This patch essentially registers DMA-mmaping/IOMMU support for FIMC and
MFC devices and performs some tweaks in clocks hierarchy to get SYSMMU
driver working correctly.

The drivers have been tested with mainline V4L2 drivers for FIMC and MFC
hardware.

For easier testing I've created a separate kernel branch with all
required prerequisite patches. It is based on lastest kgene/for-next
branch and is available on my git repository:

git://git.linaro.org/people/mszyprowski/linux-dma-mapping.git 3.4-rc2-arm-dma-v8-samsung

This patch requires the following items:
1. ARM DMA-mapping patches [1]
2. Exynos SYSMMU driver v12 [2]
3. Exynos SYSMMU driver runtime pm fixes
4. Exynos4 gen_pd power domain driver fixes

Runtime pm and power domain patches are required on Samsung Nuri board,
but might be optional on boards where bootloader doesn't disable all
devices on boot.

[1] http://www.spinics.net/lists/linux-arch/msg17331.html
[2] https://lkml.org/lkml/2012/3/15/51

Best regards
Marek Szyprowski
Samsung Poland R&D Center


Patch summary:

Marek Szyprowski (1):
  ARM: Exynos4: integrate SYSMMU driver with DMA-mapping interface

 arch/arm/mach-exynos/Kconfig               |    1 +
 arch/arm/mach-exynos/clock-exynos4.c       |   64 +++++++++++++++-------------
 arch/arm/mach-exynos/dev-sysmmu.c          |   44 +++++++++++++++++++
 arch/arm/mach-exynos/include/mach/sysmmu.h |    3 +
 drivers/iommu/Kconfig                      |    1 +
 5 files changed, 84 insertions(+), 29 deletions(-)

-- 
1.7.1.569.g6f426