Messages in this thread | | | From | Yong Wu <> | Subject | [PATCH v2 0/2] MT8173 IOMMU 4GB MODE SUPPORT | Date | Mon, 14 Mar 2016 06:01:09 +0800 |
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This patch-set add MTK 4GB mode support on the Short-Descriptor.
Normally, the memory map in mt8173 looks like below:
Physical addr | 1st GB | -> HW SRAM and Regs |-------- | 2nd GB | -> Dram 1st GB |-------- | 3rd GB | -> Dram 2nd GB |-------- | 4th GB | -> Dram 3rd GB |--------
Then if the dram size is 4GB, we have to add bit33 in the physical address. We have a "DRAM 4GB mode" toggle bit for this. If it is enabled, from CPU's point of view, the dram will be shifted to start from PA 0x1_00000000. Then the dram PA is from 0x1_00000000~0x1_ffffffff.
MTK extend the bit9 of the standard pgtable descriptor as the 4GB mode. we add a special quirk for this.
v2: - Rebase on next-20160310. - Rename IO_PGTABLE_QUIRK_MTK_4GB_EXT to IO_PGTABLE_QUIRK_ARM_MTK_4GB. - Improve the comment of this "4GB mode".
Yong Wu (2): iommu/io-pgtable: Add MTK 4GB mode in Short-descriptor iommu/mediatek: Add 4GB mode support
drivers/iommu/io-pgtable-arm-v7s.c | 13 ++++++++++++- drivers/iommu/io-pgtable.h | 6 ++++++ drivers/iommu/mtk_iommu.c | 14 +++++++++++--- 3 files changed, 29 insertions(+), 4 deletions(-)
-- 1.8.1.1.dirty
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