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    Subject[PATCH v12 00/31] iommu/exynos: Fixes and Enhancements of System MMU driver with DT
    Date
    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 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 receive 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:
    v12:
    - Rebased to the latest 3.15-rc2 master branch
    git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/master (3.15-rc2)
    - Addressed v11 review comments from
    'Sachin Kamat', 'Tomasz Figa' and 'Shaik Ameer Basha'
    - Uses macro names instead of magic numbers for clock description in DT
    - Moved DT binding document to seperate patch
    - dtsi changes are separated into multiple patches
    - patch description of some patches are updated according to the review comments
    - removed the macros which hides the clock operations
    - review comments related to compatible strings will be fixed in followup patches

    v11:
    - Rebased on the latest works on clock, arm/samsung, iommu branches
    - Change the property to link System MMU and its master H/W
    'iommu' in the master's node -> 'mmu-masters' in the System MMU's node
    - Changed compatible string:
    "samsung,sysmmu-v1"
    "samsung,sysmmu-v2"
    "samsung,sysmmu-v3.1"
    "samsung,sysmmu-v3.2"
    "samsung,sysmmu-v3.3"
    - Change the implementation of retrieving System MMU version -> simpler
    - Check NULL pointer before call to clk_enable() and clk_disable()
    - Allow a single master to link to multiple System MMUs.
    (fimc-is, fimd/g2d/Scaler in Exynos5420)
    - Workarounds of known problems of System MMU
    - Code enhancements:
    * Compilable for 64-bit
    * Enhanced error messages

    v10:
    - Rebased on the following branches
    git.linaro.org/git-ro/people/mturquette/linux.git/clk-next
    git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung.git/for-next
    git.kernel.org/pub/scm/linux/kernel/git/joro/iommu.git/next
    git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/master (3.12-rc3)
    - Set parent clock to all System MMU clocks.
    - Add clock and DT descriptos for Exynos5420
    - Modified error handling in exynos_iommu_init()
    - Split "iommu/exynos: support for device tree" patch into the following 6 patches
    iommu/exynos: handle only one instance of System MMU
    iommu/exynos: always enable runtime PM
    iommu/exynos: always use a single clock descriptor
    iommu/exynos: remove dbgname from drvdata of a System MMU
    iommu/exynos: use managed driver helper functions
    iommu/exynos: support for device tree
    - Remove 'interrupt-names' and 'status' properties from DT
    - Change n:1 relationship between master:System MMU into 1:1 relationship.
    - Removed custom fault handler and print the status of System MMU
    whenever System MMU fault is occurred.
    - Post Antonios Motakis's commit together:
    "iommu/exynos: add devices attached to the System MMU to an IOMMU group"

    v9:
    - Rebased on the following branches
    git.linaro.org/git-ro/people/mturquette/linux.git/clk-next
    git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung.git/samsung-next
    git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/master (3.11-rc4)
    - Split "add bus notifier for registering System MMU" into 5 patches
    - Call clk_prepare() that was missing in v8.
    - Fixed base address of sysmmu_tv in exynos4210.dtsi
    - BUG_ON() instead of return -EADDRINUSE when trying mapping on an mapped area
    - Moved camif_top to 317 in drivers/clk/samsung/clk-exynos5250.c
    - Removed 'iommu' property from 'codec'(mfc) node
    - Does not make 'master' clock to be the parent of 'sysmmu' clock.
    'master' clock is enabled before accessing control registers of System MMU
    and disabled after the access.

    v8:
    - Reordered patch list: moved "change rwloc to spinlock" to the last.
    - Fixed remained bug in "fix page table maintenance".
    - Always return 0 from exynos_iommu_attach_device().
    - Removed prefetch buffer setting when System MMU is enabled
    due to the restriction of prefetch buffers:
    A prefetch buffer must not hit from more than one DMA.
    For instance with GScalers, if a single prefetch buffer is initialized
    with 0x0 ~ 0xFFFFFFFF and a GScaler works on source buffer at 0x10000000
    and target buffer @ 0x20000000, the System MMU may be got deadlock.
    Clients must initialize prefetch buffers with custom function defined
    in exynos-iommu drivers whenever they need to enable prefetch buffers.
    - The clock of System MMU has no relationship with the clock of its master H/W.
    The clock of master H/W is always enabled when exynos-iommu driver needs to
    access MMIO area and disabled as soon as the access finishes.
    - Removed err_page variable used in exynos_iommu_unmap() in the previous patch
    "fix page table maintenance".
    - Split a big patch "add bus notifier for registering System MMU".
    Extracted the following 2 patches: 9/12 and 10/12.
    - And some additional fixes...

    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

    Antonios Motakis (1):
    iommu/exynos: add devices attached to the System MMU to an IOMMU
    group

    Cho KyongHo (30):
    iommu/exynos: do not include removed header
    iommu/exynos: add missing cache flush for removed page table entries
    iommu/exynos: change error handling when page table update is failed
    iommu/exynos: fix L2TLB invalidation
    iommu/exynos: remove prefetch buffer setting
    iommu/exynos: allocate lv2 page table from own slab
    iommu/exynos: always enable runtime PM
    iommu/exynos: handle one instance of sysmmu with a device descriptor
    iommu/exynos: remove dbgname from drvdata of a System MMU
    iommu/exynos: use managed device helper functions
    documentation: iommu: add binding document of Exynos System MMU
    iommu/exynos: support for device tree
    iommu/exynos: gating clocks of master H/W
    iommu/exynos: remove custom fault handler
    iommu/exynos: handle 'mmu-masters' property of DT and improve
    handling sysmmu
    iommu/exynos: turn on useful configuration options
    iommu/exynos: add support for power management subsystems.
    iommu/exynos: allow having multiple System MMUs for a master H/W
    iommu/exynos: change rwlock to spinlock
    iommu/exynos: fix address handling
    iommu/exynos: use exynos-iommu specific typedef
    iommu/exynos: use simpler function to get MMU version
    iommu/exynos: apply workaround of caching fault page table entries
    iommu/exynos: enhanced error messages
    clk: exynos: add gate clock descriptions of System MMU
    ARM: dts: add System MMU nodes of exynos4 series
    ARM: dts: add System MMU nodes of exynos4210
    ARM: dts: add System MMU nodes of exynos4x12
    ARM: dts: add System MMU nodes of exynos5250
    ARM: dts: add System MMU nodes of exynos5420

    .../devicetree/bindings/iommu/samsung,sysmmu.txt | 79 ++
    arch/arm/Kconfig | 2 +
    arch/arm/boot/dts/exynos4.dtsi | 107 ++
    arch/arm/boot/dts/exynos4210.dtsi | 23 +-
    arch/arm/boot/dts/exynos4x12.dtsi | 78 +-
    arch/arm/boot/dts/exynos5250.dtsi | 270 +++-
    arch/arm/boot/dts/exynos5420.dtsi | 209 ++-
    drivers/clk/samsung/clk-exynos5250.c | 36 +
    drivers/clk/samsung/clk-exynos5420.c | 13 +-
    drivers/iommu/Kconfig | 8 +-
    drivers/iommu/exynos-iommu.c | 1436 ++++++++++++++------
    include/dt-bindings/clock/exynos5250.h | 17 +
    include/dt-bindings/clock/exynos5420.h | 6 +-
    13 files changed, 1852 insertions(+), 432 deletions(-)
    create mode 100644 Documentation/devicetree/bindings/iommu/samsung,sysmmu.txt
    mode change 100644 => 100755 drivers/iommu/exynos-iommu.c

    --
    1.7.9.5



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