[PATCH v9 0/2] iommu/exynos: Add IOMMU/System MMU driver for Samsung Exynos

[KyongHo Cho]

Changes since v8:
- exynos_iommu_map/unmap() just works for the page sizes
   that System MMU supports. (Joerg's comment)
- 1 platform device for 1 H/W though a multimedia accelerator
   with several System MMUs attached.
   This make controlling System MMU simpler.
- Information between System MMU and the accelerators:
   Shifted to accelerator's device structure from System MMU's

Changes since v7:
- Rebased with the recent commits of the following git branches
  * git.kernel.org/pub/scm/linux/kernel/git/joro/iommu.git/next
  * git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung.git/for-next
- Changed magic numbers into macros
- Setting owner of a System MMU in 'iommu' field of dev_archdata
- Verbose message in the default fault handler
- Some bug fixes.

Changes since v6:
- Totally rewrite exynos_iommu_map() and exynos_iommu_unmap() according
  to the change in iommu_map() and iommu_unmap().
- Change special slab for Lv2 page table to kmalloc().

Changes since v5:
- Relation between device and a domain become n:1 (Joerg's comment)
- Implements iommu_commit(). --> Removed

Changes since v4:
- exynos_iommu_unmap()returns unmapped size in page order
  (Ohad Ben-Cohen's comment)
- Fixed typo error of resource names
- Fixed missing #include<mach/sysmmu.h>
  in arch/arm/mach-exynos4/mach-armlex4210.c

Changes since v3:
- Used DEFINE_RES_MEM and DEFINE_RES_IRQ macros
  to define resources of System MMU (Russell King's comment)
- Fixed removal of CONFIG_S5P_SLEEP definition
 (Sylwester Nawrocki's comment)

Changes since v2:
- Add lock for System MMU private data.
  And fixes the following problems pointed by Joerg Rodel:
- Fix wrong argument to kmalloc() and get_free_pages()
- Merged patches into 2 due to bisectability

Changes since v1:
Fixes of the following problems pointed by Russell King.:
 - Missing unlocking a spinlock in exynos_iommu_attach_dev().
 - atomic_t -> int in sysmmu_drvdata.activations
 - sysmmu_platdata -> sysmmu_drvdata
 - Change in error messages in irq handler
 - Removed casting in format of error message
 - omap_iommu_ops -> exynos_iommu_ops in the last patch

Patch Summary:
[PATCH v8 1/2] ARM: EXYNOS: Change System MMU platform device definitions
[PATCH v8 2/2] iommu/exynos: Add iommu driver for Exynos Platforms

The first patche enhances System MMU platform device definition:
 - Removed System MMU for MDMA0 in TOP block because it is not
   used. Use MDMA2 in LCD block.
 - Removed System MMU ID. Instead, a System MMU is bound to a device
   that the System MMU is dedicated during machin initialization.
   If a device driver wants to handle System MMU, it must bind its
   device with System MMU with sysmmu_set_owner().
 - clkdev

The last patch implements IOMMU API:
 - System MMU device driver is removed from arch/arm/plat-s5p
    to move it to driver/iommu directory.
 - Implements IOMMU API and System MMU driver that is moved from
    arch/arm/plat-s5p.

Diffstats:
arch/arm/mach-exynos/Kconfig                    |   11 +-
 arch/arm/mach-exynos/Makefile                   |    2 +-
 arch/arm/mach-exynos/clock-exynos4.c            |   74 +-
 arch/arm/mach-exynos/clock-exynos4.h            |    2 +
 arch/arm/mach-exynos/clock-exynos4210.c         |   11 +
 arch/arm/mach-exynos/clock-exynos4212.c         |   28 +-
 arch/arm/mach-exynos/clock-exynos5.c            |   85 ++
 arch/arm/mach-exynos/dev-sysmmu.c               |  454 ++++++-----
 arch/arm/mach-exynos/include/mach/irqs.h        |  179 ++--
 arch/arm/mach-exynos/include/mach/map.h         |   38 +
 arch/arm/mach-exynos/include/mach/memory.h      |    1 +
 arch/arm/mach-exynos/include/mach/regs-clock.h  |    5 +
 arch/arm/mach-exynos/include/mach/regs-sysmmu.h |   28 -
 arch/arm/mach-exynos/include/mach/sysmmu.h      |   83 +-
 arch/arm/mach-exynos/mach-armlex4210.c          |    1 -
 arch/arm/mach-exynos/mach-smdkv310.c            |    1 -
 arch/arm/plat-s5p/Kconfig                       |    8 -
 arch/arm/plat-s5p/Makefile                      |    1 -
 arch/arm/plat-s5p/sysmmu.c                      |  313 -------
 arch/arm/plat-samsung/include/plat/devs.h       |    1 -
 arch/arm/plat-samsung/include/plat/sysmmu.h     |   95 --
 drivers/iommu/Kconfig                           |   22 +
 drivers/iommu/Makefile                          |    1 +
 drivers/iommu/exynos-iommu.c                    | 1076 +++++++++++++++++++++++
 24 files changed, 1698 insertions(+), 822 deletions(-)