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of: use __be32 for cell value accessors

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Currently, we're using u32 for cell values, and hence assuming
host-endian device trees.

As we'd like to support little-endian platforms, use a __be32 for cell
values, and convert in the cell accessors.

Signed-off-by: Jeremy Kerr <jeremy.kerr@canonical.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Jeremy Kerr
2010-01-30 01:41:49 -07:00
committed by Grant Likely
parent 36b9d3070d
commit 2e89e685a8
3 changed files with 8 additions and 6 deletions
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8
include/linux/of.h
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@@ -20,6 +20,8 @@
#include <linux/kref.h>
#include <linux/mod_devicetable.h>
#include <asm/byteorder.h>
typedef u32 phandle;
typedef u32 ihandle;
@@ -95,16 +97,16 @@ extern void of_node_put(struct device_node *node);
*/
/* Helper to read a big number; size is in cells (not bytes) */
static inline u64 of_read_number(const u32 *cell, int size)
static inline u64 of_read_number(const __be32 *cell, int size)
{
u64 r = 0;
while (size--)
r = (r << 32) | *(cell++);
r = (r << 32) | be32_to_cpu(*(cell++));
return r;
}
/* Like of_read_number, but we want an unsigned long result */
static inline unsigned long of_read_ulong(const u32 *cell, int size)
static inline unsigned long of_read_ulong(const __be32 *cell, int size)
{
/* toss away upper bits if unsigned long is smaller than u64 */
return of_read_number(cell, size);