[PATCH v4 00/18] Exynos SYSMMU (IOMMU) integration with DT and DMA-mapping subsystem

Marek Szyprowski m.szyprowski at samsung.com
Fri Jan 16 01:12:54 PST 2015

Hello Everyone,

This is yet another attempt to get Exynos SYSMMU driver with integrated
with IOMMU & DMA-mapping subsystems. The main change from previous
version is a rebase onto latest v3.19-rc4 kernel base, which includes
"automatic DMA configuration for IOMMU masters" patches developed by
Will Deacon. The other change is long avaited addition of DTS patches
for Exynos 5250 and 5420/5422/5800.

Merge plan for this patchset:

1. All iommu related patches (with 'iommu: exynos') can be merged to
iommu tree. They don't have any direct dependencies on the DTS, DRM and
power domain initialization change - without them the driver will simply
not initialize, when no exynos,sysmmu nodes are provided in device tree.
Joerg, could you merge those patches?

2. DTS and power domain patches should go to Samsung Exynos tree. Those
patches depends on my earlier DTS patches for Exynos SoCs, which make
this patchset really complete:
- 'ARM: DTS: Exynos: convert to generic power domain bindings'
- '[PATCH v3 0/7] Enable HDMI support on Exynos platforms'
Kukjin, could you merge those patches?

3. Exynos DRM fix. This patch in my opinion should go Exynos DRM tree.
Inki, could you merge it?

Best regards
Marek Szyprowski
Samsung R&D Institute Poland

- rebased onto v3.19-rc4 and other Exynos DTS queued patches
- added DTS patch for Exynos 5250 & 5420/5422/5800

v3: http://www.spinics.net/lists/linux-samsung-soc/msg39168.html
- rebased onto "[RFC PATCH v4 0/8] Introduce automatic DMA
  configuration for IOMMU masters"
- added some minor fixes for iommu and dma-mapping frameworks

v2: http://thread.gmane.org/gmane.linux.kernel.iommu/6472/
- rebased onto "[RFC PATCH v3 0/7] Introduce automatic DMA
  configuration for IOMMU masters" patches:
- changed initialization from bus notifiers to DT related callbacks
- removed support for separate IO address spaces - this will be
  discussed separately after the basic support gets merged
- removed support for power domain notifier-based runtime power
  management - this also will be discussed separately later

v1: https://lkml.org/lkml/2014/8/5/183
- initial version, feature complete, completely rewrote integration

Patch summary:

Marek Szyprowski (18):
  drm: exynos: detach from default dma-mapping domain on init
  arm: exynos: pm_domains: add support for devices registered before
  ARM: dts: exynos4: add sysmmu nodes
  ARM: dts: exynos5250: add sysmmu nodes
  ARM: dts: exynos5420: add sysmmu nodes
  iommu: exynos: don't read version register on every tlb operation
  iommu: exynos: remove unused functions
  iommu: exynos: remove useless spinlock
  iommu: exynos: refactor function parameters to simplify code
  iommu: exynos: remove unused functions, part 2
  iommu: exynos: remove useless device_add/remove callbacks
  iommu: exynos: add support for binding more than one sysmmu to master
  iommu: exynos: add support for runtime_pm
  iommu: exynos: rename variables to reflect their purpose
  iommu: exynos: document internal structures
  iommu: exynos: remove excessive includes and sort others
  iommu: exynos: init from dt-specific callback instead of initcall
  iommu: exynos: add callback for initializing devices from device tree

 arch/arm/boot/dts/exynos4.dtsi            | 118 +++++++
 arch/arm/boot/dts/exynos4210.dtsi         |  23 ++
 arch/arm/boot/dts/exynos4x12.dtsi         |  82 +++++
 arch/arm/boot/dts/exynos5250.dtsi         | 250 +++++++++++++++
 arch/arm/boot/dts/exynos5420.dtsi         | 178 +++++++++++
 arch/arm/mach-exynos/pm_domains.c         |   9 +-
 drivers/gpu/drm/exynos/exynos_drm_iommu.c |   3 +
 drivers/iommu/exynos-iommu.c              | 490 ++++++++++++++----------------
 8 files changed, 884 insertions(+), 269 deletions(-)


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