[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>
diff --git a/arch/powerpc/kernel/prom_parse.c b/arch/powerpc/kernel/prom_parse.c
index 6bdfaf3..90eb3a3 100644
--- a/arch/powerpc/kernel/prom_parse.c
+++ b/arch/powerpc/kernel/prom_parse.c
@@ -419,7 +419,7 @@
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 @@
* 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 @@
* 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 @@
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 @@
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 925e2d3..78b7b0d 100644
--- a/include/asm-powerpc/prom.h
+++ b/include/asm-powerpc/prom.h
@@ -202,6 +202,10 @@
*/
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