[PATCH] powerpc: fix cell iommu setup

A small bug crept in the iommu driver when we made it more
generic. This patch is needed for boards that have a dma
window that does not start at bus address zero.

Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/arch/powerpc/platforms/cell/iommu.c b/arch/powerpc/platforms/cell/iommu.c
index 46e7cb9c3e64..c8a98be8b6a1 100644
--- a/arch/powerpc/platforms/cell/iommu.c
+++ b/arch/powerpc/platforms/cell/iommu.c
@@ -289,7 +289,7 @@ static void cell_do_map_iommu(struct cell_iommu *iommu,
         ioc_base = iommu->mapped_base;
         ioc_mmio_base = iommu->mapped_mmio_base;
 
-        for (real_address = 0, io_address = 0;
+        for (real_address = 0, io_address = map_start;
              io_address <= map_start + map_size;
              real_address += io_page_size, io_address += io_page_size) {
                 ioste = get_iost_entry(fake_iopt, io_address, io_page_size);
@@ -302,7 +302,7 @@ static void cell_do_map_iommu(struct cell_iommu *iommu,
                 set_iopt_cache(ioc_mmio_base,
                         get_ioc_hash_1way(ioste, io_address),
                         get_ioc_tag(ioste, io_address),
-                        get_iopt_entry(real_address-map_start, ioid, IOPT_PROT_RW));
+                        get_iopt_entry(real_address, ioid, IOPT_PROT_RW));
         }
 }