[PATCH] powerpc: pseries: Use generic dma-window parsing function

Change the pseries iommu init code to use the new of_parse_dma_window()
to parse the ibm,dma-window and ibm,my-dma-window properties of pci and
virtual device nodes.

Also, clean up vio_build_iommu_table() a little.

Tested on pseries, with both vio and pci devices.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Acked-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 14 insertions, 22 deletions

diff --git a/arch/powerpc/kernel/vio.c b/arch/powerpc/kernel/vio.c
index ac5c7bf907f5..2cda65b8171b 100644
--- a/arch/powerpc/kernel/vio.c
+++ b/arch/powerpc/kernel/vio.c
@@ -77,36 +77,28 @@ static struct iommu_table *vio_build_iommu_table(struct vio_dev *dev)
         } else
 #endif
         {
-                unsigned int *dma_window;
-                struct iommu_table *newTceTable;
-                unsigned long offset;
-                int dma_window_property_size;
-
-                dma_window = (unsigned int *)get_property(
-                                dev->dev.platform_data, "ibm,my-dma-window",
-                                &dma_window_property_size);
+                unsigned char *dma_window;
+                struct iommu_table *tbl;
+                unsigned long offset, size;
+
+                dma_window = get_property(dev->dev.platform_data,
+                                "ibm,my-dma-window", NULL);
                 if (!dma_window)
                         return NULL;
 
-                newTceTable = kmalloc(sizeof(struct iommu_table), GFP_KERNEL);
+                tbl = kmalloc(sizeof(*tbl), GFP_KERNEL);
 
-                /*
-                 * There should be some code to extract the phys-encoded
-                 * offset using prom_n_addr_cells(). However, according to
-                 * a comment on earlier versions, it's always zero, so we
-                 * don't bother
-                 */
-                offset = dma_window[1] >>  PAGE_SHIFT;
+                of_parse_dma_window(dev->dev.platform_data, dma_window,
+                                &tbl->it_index, &offset, &size);
 
                 /* TCE table size - measured in tce entries */
-                newTceTable->it_size = dma_window[4] >> PAGE_SHIFT;
+                tbl->it_size = size >> PAGE_SHIFT;
                 /* offset for VIO should always be 0 */
-                newTceTable->it_offset = offset;
-                newTceTable->it_busno = 0;
-                newTceTable->it_index = (unsigned long)dma_window[0];
-                newTceTable->it_type = TCE_VB;
+                tbl->it_offset = offset >> PAGE_SHIFT;
+                tbl->it_busno = 0;
+                tbl->it_type = TCE_VB;
 
-                return iommu_init_table(newTceTable);
+                return iommu_init_table(tbl);
         }
 }