Messages in this thread Patch in this message | | | From | Matthew Leach <> | Subject | [RFC PATCH 15/15] iommu/exynos: update to use iommu big-endian | Date | Wed, 8 Jun 2016 19:31:10 +0100 |
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From: Ben Dooks <ben.dooks@codethink.co.uk>
Add initial support for big endian by always writing the pte in le32. Note, revisit if hardware capable of doing big endian fetches.
Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk> --- Cc: Marek Szyprowski <m.szyprowski@samsung.com> Cc: Joerg Roedel <joro@8bytes.org> Cc: Kukjin Kim <kgene@kernel.org> Cc: Krzysztof Kozlowski <k.kozlowski@samsung.com> Cc: iommu@lists.linux-foundation.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-samsung-soc@vger.kernel.org Cc: linux-kernel@vger.kernel.org (open list) --- drivers/iommu/exynos-iommu.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c index 5ecc86c..dd8b3b3 100644 --- a/drivers/iommu/exynos-iommu.c +++ b/drivers/iommu/exynos-iommu.c @@ -54,6 +54,10 @@ typedef u32 sysmmu_pte_t; #define lv2ent_small(pent) ((*(pent) & 2) == 2) #define lv2ent_large(pent) ((*(pent) & 3) == 1) +#ifdef CONFIG_BIG_ENDIAN +#warning "revisit driver if we can enable big-endian ptes" +#endif + /* * v1.x - v3.x SYSMMU supports 32bit physical and 32bit virtual address spaces * v5.0 introduced support for 36bit physical address space by shifting @@ -716,7 +720,7 @@ static inline void update_pte(sysmmu_pte_t *ent, sysmmu_pte_t val) { dma_sync_single_for_cpu(dma_dev, virt_to_phys(ent), sizeof(*ent), DMA_TO_DEVICE); - *ent = val; + *ent = cpu_to_le32(val); dma_sync_single_for_device(dma_dev, virt_to_phys(ent), sizeof(*ent), DMA_TO_DEVICE); } -- 2.8.3
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