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path: root/drivers/iommu/of_iommu.c
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2015-03-03of: iommu: Add ptr to OF node arg to of_iommu_configure()Murali Karicheri1-2/+8
of_iommu_configure() is called from of_dma_configure() to setup iommu ops using DT property. This API is currently used for platform devices for which DMA configuration (including IOMMU ops) may come from the device's parent. To extend this functionality for PCI devices, this API needs to take a parent node ptr as an argument instead of assuming device's parent. This is needed since for PCI, the DMA configuration may be defined in the DT node of the root bus bridge's parent device. Currently only dma-range is used for PCI and IOMMU is not supported. Return error if the device is PCI. Add "parent" parameter (a struct device_node *) to of_iommu_configure(). Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com> (AMD Seattle) Signed-off-by: Murali Karicheri <m-karicheri2@ti.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Rob Herring <robh+dt@kernel.org> Acked-by: Will Deacon <will.deacon@arm.com> CC: Joerg Roedel <joro@8bytes.org> CC: Grant Likely <grant.likely@linaro.org> CC: Russell King <linux@arm.linux.org.uk> CC: Arnd Bergmann <arnd@arndb.de>
2014-12-05iommu: store DT-probed IOMMU data privatelyRobin Murphy1-0/+39
Since the data pointer in the DT node is public and may be overwritten by conflicting code, move the DT-probed IOMMU ops to a private list where they will be safe. Acked-by: Grant Likely <grant.likely@linaro.org> Signed-off-by: Robin Murphy <robin.murphy@arm.com> [will: added missing #include and missing ')'] Signed-off-by: Will Deacon <will.deacon@arm.com>
2014-12-01iommu: provide helper function to configure an IOMMU for an of masterWill Deacon1-0/+33
The generic IOMMU device-tree bindings can be used to add arbitrary OF masters to an IOMMU with a compliant binding. This patch introduces of_iommu_configure, which does exactly that. Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Joerg Roedel <jroedel@suse.de> Acked-by: Marek Szyprowski <m.szyprowski@samsung.com> Tested-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
2014-12-01iommu: provide early initialisation hook for IOMMU driversWill Deacon1-0/+17
IOMMU drivers must be initialised before any of their upstream devices, otherwise the relevant iommu_ops won't be configured for the bus in question. To solve this, a number of IOMMU drivers use initcalls to initialise the driver before anything has a chance to be probed. Whilst this solves the immediate problem, it leaves the job of probing the IOMMU completely separate from the iommu_ops to configure the IOMMU, which are called on a per-bus basis and require the driver to figure out exactly which instance of the IOMMU is being requested. In particular, the add_device callback simply passes a struct device to the driver, which then has to parse firmware tables or probe buses to identify the relevant IOMMU instance. This patch takes the first step in addressing this problem by adding an early initialisation pass for IOMMU drivers, giving them the ability to store some per-instance data in their iommu_ops structure and store that in their of_node. This can later be used when parsing OF masters to identify the IOMMU instance in question. Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Joerg Roedel <jroedel@suse.de> Acked-by: Marek Szyprowski <m.szyprowski@samsung.com> Tested-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
2014-01-07iommu: add missing includeBrian Norris1-0/+1
Fix a warning in of_iommu.c: drivers/iommu/of_iommu.c:38:5: warning: no previous prototype for 'of_get_dma_window' [-Wmissing-prototypes] Signed-off-by: Brian Norris <computersforpeace@gmail.com> Cc: Hiroshi DOYU <hdoyu@nvidia.com> Signed-off-by: Joerg Roedel <joro@8bytes.org>
2012-06-25iommu: Add DMA window parser, of_get_dma_window()Hiroshi Doyu1-0/+90
This code was based on: "arch/microblaze/kernel/prom_parse.c" "arch/powerpc/kernel/prom_parse.c" Can replace "of_parse_dma_window()" in the above. This supports different formats flexibly. "prefix" can be configured if any. "busno" and "index" are optionally specified. Set NULL and 0 if not used. Signed-off-by: Hiroshi DOYU <hdoyu@nvidia.com> Acked-by: Stephen Warren <swarren@wwwdotorg.org> Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>