From: Cho KyongHo <pullip.cho@samsung.com>
To: "'Linux ARM Kernel'" <linux-arm-kernel@lists.infradead.org>,
        "'Linux IOMMU'" <iommu@lists.linux-foundation.org>,
        "'Linux Kernel'" <linux-kernel@vger.kernel.org>,
        "'Linux Samsung SOC'" <linux-samsung-soc@vger.kernel.org>
Cc: "'Hyunwoong Kim'" <khw0178.kim@samsung.com>,
        "'Joerg Roedel'" <joro@8bytes.org>,
        "'Kukjin Kim'" <kgene.kim@samsung.com>,
        "'Prathyush'" <prathyush.k@samsung.com>,
        "'Rahul Sharma'" <rahul.sharma@samsung.com>,
        "'Subash Patel'" <supash.ramaswamy@linaro.org>,
        "'Keyyoung Park'" <keyyoung.park@samsung.com>,
        "'Grant Grundler'" <grundler@chromium.org>
Subject: [PATCH v7 00/12] iommu/exynos: Fixes and Enhancements of System MMU
 driver with DT
Date: Fri, 05 Jul 2013 21:29:05 +0900
Message-id: <002801ce797b$3d2fbc80$b78f3580$@samsung.com>
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The current exynos-iommu(System MMU) driver does not work autonomously
since it is lack of support for power management of peripheral blocks.
For example, MFC device driver must ensure that its System MMU is disabled
before MFC block is power-down not to invalidate IOTLB in the System MMU
when I/O memory mapping is changed. Because A System MMU is resides in the
same H/W block, access to control registers of System MMU while the H/W
block is turned off must be prohibited.

This set of changes solves the above problem with setting each System MMUs
as the parent of the device which owns the System MMU to recieve the
information when the device is turned off or turned on.

Another big change to the driver is the support for devicetree.
The bindings for System MMU is described in
Documentation/devicetree/bindings/arm/samsung/system-mmu.txt

In addition, this patchset also includes several bug fixes and enhancements
of the current driver.

Change log:
v7:
- Rebased on the stable 3.10
- Registered PM domains and gate clocks with DT
- Changed connection method between a System MMU and its master H/W
   'mmu-master' property in the node of System MMU
   --> 'iommu' property in the node of master H/W
- Marking device descriptor of master H/W of a System MMU with bus notifier.
- Power management (PM_RUNTIME, PM_SLEEP) of System MMUs with gpd_dev_ops
   of Generic IO Powerdomain. gpd_dev_ops are set to the master H/Ws
   before they are probed in the bus notifier.
- Removed additional debugging features like debugfs entries and
   version names.
- Removed support for advanced features of System MMU 3.2 and 3.3
   the current IOMMU API cannot handle the feature
  (A kind of L2 TLB that fetches several consequence page table entries.
   It must be initialized by the driver of master H/W whenever it works.)

v6:
- Rebased on the branch, next/iommu-exynos of
  git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung.git

v5:
- new bugfix: patch 01
- Reordered patches
  * patch 01 ~ 05: Bugfix and enhancements of the existing driver
  * patch 06 ~ 10: Device Tree support and callbacks for power management
  * patch 11     : System MMU 3.2 and 3.3 support
  * patch 12 ~ 14: Debugging features
- Additional code compaction

v4:
- Remove Change-Id from v3 patches
- Change the order of the third and the first patch
  Thanks to Kukjin Kim.
- Fix memory leak when allocating and assigning exynos_iommu_owner to client
  device if the client device has multiple System MMUs.
  Thanks to Rahul Sharma.

v3:
- Fix prefetch buffer flag definition for System MMU 3.3 (patch 10/12)
- Fix incorrect setting for SET_RUNTIME_PM_OPS (patch 09/12)
  Thanks to Prathyush.

v2:
- Split the patch to iommu/exynos into 9 patches
- Support for System MMU 3.3
- Some code compaction

Patch summary:
[PATCH v7 1/9] iommu/exynos: do not include removed header
[PATCH v7 2/9] iommu/exynos: add missing cache flush for removed page table entries
[PATCH v7 3/9] iommu/exynos: fix page table maintenance
[PATCH v7 4/9] iommu/exynos: allocate lv2 page table from own slab
[PATCH v7 5/9] iommu/exynos: change rwlock to spinlock
[PATCH v7 6/9] clk: exynos5250: add gate clock descriptions of System MMU
[PATCH v7 7/9] ARM: dts: Add description of System MMU of Exynos SoCs
[PATCH v7 8/9] iommu/exynos: support for device tree
[PATCH v7 9/9] iommu/exynos: add bus notifier for registering System MMU

Diffstats:
.../devicetree/bindings/clock/exynos5250-clock.txt |   28 +-
.../bindings/iommu/samsung,exynos4210-sysmmu.txt   |  103 ++
arch/arm/boot/dts/exynos4.dtsi                     |  122 +++
arch/arm/boot/dts/exynos4210.dtsi                  |   25 +
arch/arm/boot/dts/exynos4x12.dtsi                  |   76 ++
arch/arm/boot/dts/exynos5250.dtsi                  |  291 ++++++
drivers/clk/samsung/clk-exynos5250.c               |   57 +-
drivers/iommu/Kconfig                              |    5 +-
drivers/iommu/exynos-iommu.c                       | 1011 +++++++++++++-------
9 files changed, 1382 insertions(+), 336 deletions(-)

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