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of/flattree: Merge unflatten_device_tree

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Merge common code between PowerPC and MicroBlaze

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Reviewed-by: Wolfram Sang <w.sang@pengutronix.de>
Tested-by: Michal Simek <monstr@monstr.eu>
This commit is contained in:
Grant Likely
2009-11-23 20:07:01 -07:00
parent bbd33931a0
commit 41f880091c
6 changed files with 55 additions and 104 deletions
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52
drivers/of/fdt.c
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@@ -9,6 +9,8 @@
* version 2 as published by the Free Software Foundation.
*/
#include <linux/kernel.h>
#include <linux/lmb.h>
#include <linux/of.h>
#include <linux/of_fdt.h>
@@ -366,3 +368,53 @@ unsigned long __init unflatten_dt_node(unsigned long mem,
*p += 4;
return mem;
}
/**
* unflatten_device_tree - create tree of device_nodes from flat blob
*
* unflattens the device-tree passed by the firmware, creating the
* tree of struct device_node. It also fills the "name" and "type"
* pointers of the nodes so the normal device-tree walking functions
* can be used.
*/
void __init unflatten_device_tree(void)
{
unsigned long start, mem, size;
struct device_node **allnextp = &allnodes;
pr_debug(" -> unflatten_device_tree()\n");
/* First pass, scan for size */
start = ((unsigned long)initial_boot_params) +
initial_boot_params->off_dt_struct;
size = unflatten_dt_node(0, &start, NULL, NULL, 0);
size = (size | 3) + 1;
pr_debug(" size is %lx, allocating...\n", size);
/* Allocate memory for the expanded device tree */
mem = lmb_alloc(size + 4, __alignof__(struct device_node));
mem = (unsigned long) __va(mem);
((u32 *)mem)[size / 4] = 0xdeadbeef;
pr_debug(" unflattening %lx...\n", mem);
/* Second pass, do actual unflattening */
start = ((unsigned long)initial_boot_params) +
initial_boot_params->off_dt_struct;
unflatten_dt_node(mem, &start, NULL, &allnextp, 0);
if (*((u32 *)start) != OF_DT_END)
pr_warning("Weird tag at end of tree: %08x\n", *((u32 *)start));
if (((u32 *)mem)[size / 4] != 0xdeadbeef)
pr_warning("End of tree marker overwritten: %08x\n",
((u32 *)mem)[size / 4]);
*allnextp = NULL;
/* Get pointer to OF "/chosen" node for use everywhere */
of_chosen = of_find_node_by_path("/chosen");
if (of_chosen == NULL)
of_chosen = of_find_node_by_path("/chosen@0");
pr_debug(" <- unflatten_device_tree()\n");
}