iommu/exynos: update to use iommu big-endian

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>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index 633e6d023c0d..33dcc29ec200 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
@@ -710,7 +714,7 @@ 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);
 }