[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>

2 files changed, 24 insertions, 41 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);
         }
 }
 
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;
         }