[PATCH] powerpc: Add of_parse_dma_window()

Add a function for generic parsing of dma-window properties (ie,
ibm,dma-window and ibm,my-dma-window) of pci and virtual device nodes.

This function will also be used by cell.

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, 28 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/prom_parse.c b/arch/powerpc/kernel/prom_parse.c
index 3934c227549b..23bb060330ef 100644
--- a/arch/powerpc/kernel/prom_parse.c
+++ b/arch/powerpc/kernel/prom_parse.c
@@ -548,3 +548,25 @@ int of_pci_address_to_resource(struct device_node *dev, int bar,
         return __of_address_to_resource(dev, addrp, size, flags, r);
 }
 EXPORT_SYMBOL_GPL(of_pci_address_to_resource);
+
+void of_parse_dma_window(struct device_node *dn, unsigned char *dma_window_prop,
+                unsigned long *busno, unsigned long *phys, unsigned long *size)
+{
+        u32 *dma_window, cells;
+        unsigned char *prop;
+
+        dma_window = (u32 *)dma_window_prop;
+
+        /* busno is always one cell */
+        *busno = *(dma_window++);
+
+        prop = get_property(dn, "ibm,#dma-address-cells", NULL);
+        cells = prop ? *(u32 *)prop : prom_n_addr_cells(dn);
+        *phys = of_read_addr(dma_window, cells);
+
+        dma_window += cells;
+
+        prop = get_property(dn, "ibm,#dma-size-cells", NULL);
+        cells = prop ? *(u32 *)prop : prom_n_size_cells(dn);
+        *size = of_read_addr(dma_window, cells);
+}
diff --git a/include/asm-powerpc/prom.h b/include/asm-powerpc/prom.h
index 97ef1cd71a4d..c79d58ab7441 100644
--- a/include/asm-powerpc/prom.h
+++ b/include/asm-powerpc/prom.h
@@ -230,6 +230,12 @@ extern int of_address_to_resource(struct device_node *dev, int index,
 extern int of_pci_address_to_resource(struct device_node *dev, int bar,
                                       struct resource *r);
 
+/* Parse the ibm,dma-window property of an OF node into the busno, phys and
+ * size parameters.
+ */
+void of_parse_dma_window(struct device_node *dn, unsigned char *dma_window_prop,
+                unsigned long *busno, unsigned long *phys, unsigned long *size);
+
 extern void kdump_move_device_tree(void);
 
 #endif /* __KERNEL__ */