[PATCH v9 00/16] iommu/exynos: Fixes and Enhancements of System MMU driver with DT
t.figa at samsung.com
Thu Aug 8 08:13:57 EDT 2013
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On Thursday 08 of August 2013 18:37:10 Cho KyongHo wrote:
> 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
> In addition, this patchset also includes several bug fixes and
> enhancements of the current driver.
> Change log:
> - Rebased on the following branches
> 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.
> - 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...
> - 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.)
> - Rebased on the branch, next/iommu-exynos of
> - 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
> - 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.
> - 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.
> - Split the patch to iommu/exynos into 9 patches
> - Support for System MMU 3.3
> - Some code compaction
> Patch summary:
> .../devicetree/bindings/clock/exynos5250-clock.txt | 26 +
> .../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 | 82 ++
> arch/arm/boot/dts/exynos5250.dtsi | 290 ++++++
> drivers/clk/samsung/clk-exynos4.c | 27 +-
> drivers/clk/samsung/clk-exynos5250.c | 57 +-
> drivers/iommu/Kconfig | 5 +-
> drivers/iommu/exynos-iommu.c | 1061
> +++++++++++++------- 10 files changed, 1423 insertions(+), 375
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