[POWERPC] Add of_translate_dma_address

This adds a variant of of_translate_address that uses the dma-ranges
property instead of "ranges", it's to be used by PCI code in parsing
the dma-ranges property.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

2 files changed, 20 insertions, 4 deletions

diff --git a/arch/powerpc/kernel/prom_parse.c b/arch/powerpc/kernel/prom_parse.c
index 6bdfaf3f99e..90eb3a3e383 100644
--- a/arch/powerpc/kernel/prom_parse.c
+++ b/arch/powerpc/kernel/prom_parse.c
@@ -419,7 +419,7 @@ static struct of_bus *of_match_bus(struct device_node *np)
 
 static int of_translate_one(struct device_node *parent, struct of_bus *bus,
                             struct of_bus *pbus, u32 *addr,
-                            int na, int ns, int pna)
+                            int na, int ns, int pna, const char *rprop)
 {
         const u32 *ranges;
         unsigned int rlen;
@@ -438,7 +438,7 @@ static int of_translate_one(struct device_node *parent, struct of_bus *bus,
          * to translate addresses that aren't supposed to be translated in
          * the first place. --BenH.
          */
-        ranges = of_get_property(parent, "ranges", &rlen);
+        ranges = of_get_property(parent, rprop, &rlen);
         if (ranges == NULL || rlen == 0) {
                 offset = of_read_number(addr, na);
                 memset(addr, 0, pna * 4);
@@ -481,7 +481,8 @@ static int of_translate_one(struct device_node *parent, struct of_bus *bus,
  * that can be mapped to a cpu physical address). This is not really specified
  * that way, but this is traditionally the way IBM at least do things
  */
-u64 of_translate_address(struct device_node *dev, const u32 *in_addr)
+u64 __of_translate_address(struct device_node *dev, const u32 *in_addr,
+                           const char *rprop)
 {
         struct device_node *parent = NULL;
         struct of_bus *bus, *pbus;
@@ -540,7 +541,7 @@ u64 of_translate_address(struct device_node *dev, const u32 *in_addr)
                     pbus->name, pna, pns, parent->full_name);
 
                 /* Apply bus translation */
-                if (of_translate_one(dev, bus, pbus, addr, na, ns, pna))
+                if (of_translate_one(dev, bus, pbus, addr, na, ns, pna, rprop))
                         break;
 
                 /* Complete the move up one level */
@@ -556,8 +557,19 @@ u64 of_translate_address(struct device_node *dev, const u32 *in_addr)
 
         return result;
 }
+
+u64 of_translate_address(struct device_node *dev, const u32 *in_addr)
+{
+        return __of_translate_address(dev, in_addr, "ranges");
+}
 EXPORT_SYMBOL(of_translate_address);
 
+u64 of_translate_dma_address(struct device_node *dev, const u32 *in_addr)
+{
+        return __of_translate_address(dev, in_addr, "dma-ranges");
+}
+EXPORT_SYMBOL(of_translate_dma_address);
+
 const u32 *of_get_address(struct device_node *dev, int index, u64 *size,
                     unsigned int *flags)
 {
diff --git a/include/asm-powerpc/prom.h b/include/asm-powerpc/prom.h
index 925e2d384bb..78b7b0d494c 100644
--- a/include/asm-powerpc/prom.h
+++ b/include/asm-powerpc/prom.h
@@ -202,6 +202,10 @@ static inline unsigned long of_read_ulong(const u32 *cell, int size)
  */
 extern u64 of_translate_address(struct device_node *np, const u32 *addr);
 
+/* Translate a DMA address from device space to CPU space */
+extern u64 of_translate_dma_address(struct device_node *dev,
+                                    const u32 *in_addr);
+
 /* Extract an address from a device, returns the region size and
  * the address space flags too. The PCI version uses a BAR number
  * instead of an absolute index