[POWERPC] Split out the IOMMU logic from cell_dma_dev_setup()

Split the IOMMU logic out from cell_dma_dev_setup() into a separate
function.  If we're not using dma_direct_ops or dma_iommu_ops we don't
know what the hell's going on, so BUG.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 13 insertions, 6 deletions

diff --git a/arch/powerpc/platforms/cell/iommu.c b/arch/powerpc/platforms/cell/iommu.c
index b3655aa88ddb..a6e6bc1b020f 100644
--- a/arch/powerpc/platforms/cell/iommu.c
+++ b/arch/powerpc/platforms/cell/iommu.c
@@ -507,17 +507,12 @@ static struct cbe_iommu *cell_iommu_for_node(int nid)
 
 static unsigned long cell_dma_direct_offset;
 
-static void cell_dma_dev_setup(struct device *dev)
+static void cell_dma_dev_setup_iommu(struct device *dev)
 {
         struct iommu_window *window;
         struct cbe_iommu *iommu;
         struct dev_archdata *archdata = &dev->archdata;
 
-        if (get_pci_dma_ops() == &dma_direct_ops) {
-                archdata->dma_data = (void *)cell_dma_direct_offset;
-                return;
-        }
-
         /* Current implementation uses the first window available in that
          * node's iommu. We -might- do something smarter later though it may
          * never be necessary
@@ -534,6 +529,18 @@ static void cell_dma_dev_setup(struct device *dev)
         archdata->dma_data = &window->table;
 }
 
+static void cell_dma_dev_setup(struct device *dev)
+{
+        struct dev_archdata *archdata = &dev->archdata;
+
+        if (get_pci_dma_ops() == &dma_iommu_ops)
+                cell_dma_dev_setup_iommu(dev);
+        else if (get_pci_dma_ops() == &dma_direct_ops)
+                archdata->dma_data = (void *)cell_dma_direct_offset;
+        else
+                BUG();
+}
+
 static void cell_pci_dma_dev_setup(struct pci_dev *dev)
 {
         cell_dma_dev_setup(&dev->dev);