Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 41f88009 authored by Grant Likely's avatar Grant Likely
Browse files

of/flattree: Merge unflatten_device_tree 



Merge common code between PowerPC and MicroBlaze

Signed-off-by: default avatarGrant Likely <grant.likely@secretlab.ca>
Reviewed-by: default avatarWolfram Sang <w.sang@pengutronix.de>
Tested-by: default avatarMichal Simek <monstr@monstr.eu>
parent bbd33931

arch/microblaze/include/asm/prom.h

+0 −1
Original line number Diff line number Diff line
@@ -37,7 +37,6 @@ extern struct device_node *of_chosen; 


#define HAVE_ARCH_DEVTREE_FIXUPS



extern struct device_node *allnodes;	/* temporary while merging */

extern rwlock_t devtree_lock;	/* temporary while merging */



/* For updating the device tree at runtime */

arch/microblaze/kernel/prom.c

+0 −49
Original line number Diff line number Diff line
@@ -50,55 +50,6 @@ typedef u32 cell_t; 
/* export that to outside world */

struct device_node *of_chosen;



/**

 * 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 (this used to be done by finish_device_tree)

 */

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)

		printk(KERN_WARNING "Weird tag at end of tree: %08x\n",

			*((u32 *)start));

	if (((u32 *)mem)[size / 4] != 0xdeadbeef)

		printk(KERN_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");

}



#define early_init_dt_scan_drconf_memory(node) 0



static int __init early_init_dt_scan_cpus(unsigned long node,

arch/powerpc/kernel/prom.c

+0 −50
Original line number Diff line number Diff line
@@ -73,8 +73,6 @@ unsigned long tce_alloc_start, tce_alloc_end; 


typedef u32 cell_t;



extern struct device_node *allnodes;	/* temporary while merging */



extern rwlock_t devtree_lock;	/* temporary while merging */



/* export that to outside world */
@@ -119,54 +117,6 @@ static void __init move_device_tree(void) 
	DBG("<- move_device_tree\n");

}



/**

 * 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 (this used to be done by finish_device_tree)

 */

void __init unflatten_device_tree(void)

{

	unsigned long start, mem, size;

	struct device_node **allnextp = &allnodes;



	DBG(" -> 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;



	DBG("  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;



	DBG("  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)

		printk(KERN_WARNING "Weird tag at end of tree: %08x\n", *((u32 *)start));

	if (((u32 *)mem)[size / 4] != 0xdeadbeef)

		printk(KERN_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");



	DBG(" <- unflatten_device_tree()\n");

}



/*

 * ibm,pa-features is a per-cpu property that contains a string of

 * attribute descriptors, each of which has a 2 byte header plus up

drivers/of/fdt.c

+52 −0
Original line number Diff line number Diff line
@@ -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");

}

include/linux/of.h

+3 −0
Original line number Diff line number Diff line
@@ -63,6 +63,9 @@ struct device_node { 
#endif

};



/* Pointer for first entry in chain of all nodes. */

extern struct device_node *allnodes;



static inline int of_node_check_flag(struct device_node *n, unsigned long flag)

{

	return test_bit(flag, &n->_flags);