iommu/omap: Fix map protection value handling

The prot flags passed to the IOMMU map handler are defined in
include/linux/iommu.h as IOMMU_(READ|WRITE|CACHE|EXEC). However, the
driver expects to receive MMU_RAM_* OMAP-specific flags. This causes
IOMMU flags being interpreted as page sizes, leading to failures.

Hardcode the OMAP mapping parameters to little-endian, 8-bits and
non-mixed page attributes. Furthermore, as the OMAP IOMMU doesn't
support read-only or write-only mappings, ignore the prot value.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Sakari Ailus <sakari.ailus@iki.fi>
Acked-by: Suman Anna <s-anna@ti.com>

1 files changed, 7 insertions, 10 deletions

diff --git a/drivers/iommu/omap-iommu.c b/drivers/iommu/omap-iommu.c
index 31cebf20285c..895af06a667f 100644
--- a/drivers/iommu/omap-iommu.c
+++ b/drivers/iommu/omap-iommu.c
@@ -1041,8 +1041,7 @@ static void iopte_cachep_ctor(void *iopte)
         clean_dcache_area(iopte, IOPTE_TABLE_SIZE);
 }
 
-static u32 iotlb_init_entry(struct iotlb_entry *e, u32 da, u32 pa,
-                                   u32 flags)
+static u32 iotlb_init_entry(struct iotlb_entry *e, u32 da, u32 pa, int pgsz)
 {
         memset(e, 0, sizeof(*e));
 
@@ -1050,10 +1049,10 @@ static u32 iotlb_init_entry(struct iotlb_entry *e, u32 da, u32 pa,
         e->pa           = pa;
         e->valid        = MMU_CAM_V;
         /* FIXME: add OMAP1 support */
-        e->pgsz         = flags & MMU_CAM_PGSZ_MASK;
-        e->endian       = flags & MMU_RAM_ENDIAN_MASK;
-        e->elsz         = flags & MMU_RAM_ELSZ_MASK;
-        e->mixed        = flags & MMU_RAM_MIXED_MASK;
+        e->pgsz         = pgsz;
+        e->endian       = MMU_RAM_ENDIAN_LITTLE;
+        e->elsz         = MMU_RAM_ELSZ_8;
+        e->mixed        = 0;
 
         return iopgsz_to_bytes(e->pgsz);
 }
@@ -1066,7 +1065,7 @@ static int omap_iommu_map(struct iommu_domain *domain, unsigned long da,
         struct device *dev = oiommu->dev;
         struct iotlb_entry e;
         int omap_pgsz;
-        u32 ret, flags;
+        u32 ret;
 
         omap_pgsz = bytes_to_iopgsz(bytes);
         if (omap_pgsz < 0) {
@@ -1076,9 +1075,7 @@ static int omap_iommu_map(struct iommu_domain *domain, unsigned long da,
 
         dev_dbg(dev, "mapping da 0x%lx to pa 0x%x size 0x%x\n", da, pa, bytes);
 
-        flags = omap_pgsz | prot;
-
-        iotlb_init_entry(&e, da, pa, flags);
+        iotlb_init_entry(&e, da, pa, omap_pgsz);
 
         ret = omap_iopgtable_store_entry(oiommu, &e);
         if (ret)