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-rw-r--r--arch/powerpc/kernel/prom_parse.c22
-rw-r--r--include/asm-powerpc/prom.h6
2 files changed, 28 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/prom_parse.c b/arch/powerpc/kernel/prom_parse.c
index 3934c227549..23bb060330e 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 97ef1cd71a4..c79d58ab744 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__ */