1 files changed, 10 insertions, 19 deletions

diff --git a/arch/powerpc/platforms/pseries/iommu.c b/arch/powerpc/platforms/pseries/iommu.c
index ed102f390689..44a507e6fb34 100644
--- a/arch/powerpc/platforms/pseries/iommu.c
+++ b/arch/powerpc/platforms/pseries/iommu.c
@@ -281,30 +281,22 @@ static void iommu_table_setparms(struct pci_controller *phb,
  * iommu_table_setparms_lpar
  *
  * Function: On pSeries LPAR systems, return TCE table info, given a pci bus.
- *
- * ToDo: properly interpret the ibm,dma-window property.  The definition is:
- *      logical-bus-number      (1 word)
- *      phys-address            (#address-cells words)
- *      size                    (#cell-size words)
- *
- * Currently we hard code these sizes (more or less).
  */
 static void iommu_table_setparms_lpar(struct pci_controller *phb,
                                       struct device_node *dn,
                                       struct iommu_table *tbl,
-                                      unsigned int *dma_window)
+                                      unsigned char *dma_window)
 {
+        unsigned long offset, size;
+
         tbl->it_busno  = PCI_DN(dn)->bussubno;
+        of_parse_dma_window(dn, dma_window, &tbl->it_index, &offset, &size);
 
-        /* TODO: Parse field size properties properly. */
-        tbl->it_size   = (((unsigned long)dma_window[4] << 32) |
-                           (unsigned long)dma_window[5]) >> PAGE_SHIFT;
-        tbl->it_offset = (((unsigned long)dma_window[2] << 32) |
-                           (unsigned long)dma_window[3]) >> PAGE_SHIFT;
         tbl->it_base   = 0;
-        tbl->it_index  = dma_window[0];
         tbl->it_blocksize  = 16;
         tbl->it_type = TCE_PCI;
+        tbl->it_offset = offset >> PAGE_SHIFT;
+        tbl->it_size = size >> PAGE_SHIFT;
 }
 
 static void iommu_bus_setup_pSeries(struct pci_bus *bus)
@@ -396,7 +388,7 @@ static void iommu_bus_setup_pSeriesLP(struct pci_bus *bus)
         struct iommu_table *tbl;
         struct device_node *dn, *pdn;
         struct pci_dn *ppci;
-        unsigned int *dma_window = NULL;
+        unsigned char *dma_window = NULL;
 
         DBG("iommu_bus_setup_pSeriesLP, bus %p, bus->self %p\n", bus, bus->self);
 
@@ -404,7 +396,7 @@ static void iommu_bus_setup_pSeriesLP(struct pci_bus *bus)
 
         /* Find nearest ibm,dma-window, walking up the device tree */
         for (pdn = dn; pdn != NULL; pdn = pdn->parent) {
-                dma_window = (unsigned int *)get_property(pdn, "ibm,dma-window", NULL);
+                dma_window = get_property(pdn, "ibm,dma-window", NULL);
                 if (dma_window != NULL)
                         break;
         }
@@ -498,7 +490,7 @@ static void iommu_dev_setup_pSeriesLP(struct pci_dev *dev)
 {
         struct device_node *pdn, *dn;
         struct iommu_table *tbl;
-        int *dma_window = NULL;
+        unsigned char *dma_window = NULL;
         struct pci_dn *pci;
 
         DBG("iommu_dev_setup_pSeriesLP, dev %p (%s)\n", dev, pci_name(dev));
@@ -513,8 +505,7 @@ static void iommu_dev_setup_pSeriesLP(struct pci_dev *dev)
 
         for (pdn = dn; pdn && PCI_DN(pdn) && !PCI_DN(pdn)->iommu_table;
              pdn = pdn->parent) {
-                dma_window = (unsigned int *)
-                        get_property(pdn, "ibm,dma-window", NULL);
+                dma_window = get_property(pdn, "ibm,dma-window", NULL);
                 if (dma_window)
                         break;
         }