openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

[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>
This commit is contained in:
Benjamin Herrenschmidt 2007-12-11 14:48:22 +11:00 committed by Paul Mackerras
parent f276b5ba0d
commit 837c54db21
2 changed files with 20 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
arch/powerpc/kernel/prom_parse.c
View File

@ -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)
{

4
include/asm-powerpc/prom.h
View File

@ -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