of/flattree: Merge unflatten_device_tree

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>

diff --git a/arch/microblaze/include/asm/prom.h b/arch/microblaze/include/asm/prom.h
index ef3ec1d..07d1063 100644 (file)
--- a/arch/microblaze/include/asm/prom.h
+++ b/arch/microblaze/include/asm/prom.h
@@ -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 */

diff --git a/arch/microblaze/kernel/prom.c b/arch/microblaze/kernel/prom.c
index 021770a..901d538 100644 (file)
--- a/arch/microblaze/kernel/prom.c
+++ b/arch/microblaze/kernel/prom.c
@@ -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,

diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index a102a0a..1280f34 100644 (file)
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -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

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 6852ecf..43d236c 100644 (file)
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -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");
+}

diff --git a/include/linux/of.h b/include/linux/of.h
index e7facd8..bec2157 100644 (file)
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -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);

diff --git a/include/linux/of_fdt.h b/include/linux/of_fdt.h
index ace9068..81231e0 100644 (file)
--- a/include/linux/of_fdt.h
+++ b/include/linux/of_fdt.h
@@ -69,10 +69,6 @@ extern void *of_get_flat_dt_prop(unsigned long node, const char *name,
                                 unsigned long *size);
 extern int of_flat_dt_is_compatible(unsigned long node, const char *name);
 extern unsigned long of_get_flat_dt_root(void);
-extern unsigned long unflatten_dt_node(unsigned long mem, unsigned long *p,
-                                       struct device_node *dad,
-                                       struct device_node ***allnextpp,
-                                       unsigned long fpsize);
 
 /* Other Prototypes */
 extern void finish_device_tree(void);