of/flattree: Merge earlyinit_dt_scan_root()
Merge common code between PowerPC and Microblaze
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Tested-by: Wolfram Sang <w.sang@pengutronix.de>
diff --git a/arch/microblaze/kernel/prom.c b/arch/microblaze/kernel/prom.c
index 7959495b..189179a 100644
--- a/arch/microblaze/kernel/prom.c
+++ b/arch/microblaze/kernel/prom.c
@@ -42,9 +42,6 @@
#include <asm/sections.h>
#include <asm/pci-bridge.h>
-static int __initdata dt_root_addr_cells;
-static int __initdata dt_root_size_cells;
-
typedef u32 cell_t;
/* export that to outside world */
@@ -158,26 +155,6 @@
return 1;
}
-static int __init early_init_dt_scan_root(unsigned long node,
- const char *uname, int depth, void *data)
-{
- u32 *prop;
-
- if (depth != 0)
- return 0;
-
- prop = of_get_flat_dt_prop(node, "#size-cells", NULL);
- dt_root_size_cells = (prop == NULL) ? 1 : *prop;
- pr_debug("dt_root_size_cells = %x\n", dt_root_size_cells);
-
- prop = of_get_flat_dt_prop(node, "#address-cells", NULL);
- dt_root_addr_cells = (prop == NULL) ? 2 : *prop;
- pr_debug("dt_root_addr_cells = %x\n", dt_root_addr_cells);
-
- /* break now */
- return 1;
-}
-
static u64 __init dt_mem_next_cell(int s, cell_t **cellp)
{
cell_t *p = *cellp;
diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index 1ecd6c6..78f65a4 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -61,10 +61,6 @@
#define DBG(fmt...)
#endif
-
-static int __initdata dt_root_addr_cells;
-static int __initdata dt_root_size_cells;
-
#ifdef CONFIG_PPC64
int __initdata iommu_is_off;
int __initdata iommu_force_on;
@@ -436,26 +432,6 @@
return 1;
}
-static int __init early_init_dt_scan_root(unsigned long node,
- const char *uname, int depth, void *data)
-{
- u32 *prop;
-
- if (depth != 0)
- return 0;
-
- prop = of_get_flat_dt_prop(node, "#size-cells", NULL);
- dt_root_size_cells = (prop == NULL) ? 1 : *prop;
- DBG("dt_root_size_cells = %x\n", dt_root_size_cells);
-
- prop = of_get_flat_dt_prop(node, "#address-cells", NULL);
- dt_root_addr_cells = (prop == NULL) ? 2 : *prop;
- DBG("dt_root_addr_cells = %x\n", dt_root_addr_cells);
-
- /* break now */
- return 1;
-}
-
static u64 __init dt_mem_next_cell(int s, cell_t **cellp)
{
cell_t *p = *cellp;
diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 6ad98e8..be200be 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -15,6 +15,9 @@
#include <linux/of.h>
#include <linux/of_fdt.h>
+int __initdata dt_root_addr_cells;
+int __initdata dt_root_size_cells;
+
struct boot_param_header *initial_boot_params;
char *find_flat_dt_string(u32 offset)
@@ -407,6 +410,29 @@
#endif /* CONFIG_BLK_DEV_INITRD */
/**
+ * early_init_dt_scan_root - fetch the top level address and size cells
+ */
+int __init early_init_dt_scan_root(unsigned long node, const char *uname,
+ int depth, void *data)
+{
+ u32 *prop;
+
+ if (depth != 0)
+ return 0;
+
+ prop = of_get_flat_dt_prop(node, "#size-cells", NULL);
+ dt_root_size_cells = (prop == NULL) ? 1 : *prop;
+ pr_debug("dt_root_size_cells = %x\n", dt_root_size_cells);
+
+ prop = of_get_flat_dt_prop(node, "#address-cells", NULL);
+ dt_root_addr_cells = (prop == NULL) ? 2 : *prop;
+ pr_debug("dt_root_addr_cells = %x\n", dt_root_addr_cells);
+
+ /* break now */
+ return 1;
+}
+
+/**
* unflatten_device_tree - create tree of device_nodes from flat blob
*
* unflattens the device-tree passed by the firmware, creating the
diff --git a/include/linux/of_fdt.h b/include/linux/of_fdt.h
index ec2db82..828c3cd 100644
--- a/include/linux/of_fdt.h
+++ b/include/linux/of_fdt.h
@@ -58,6 +58,8 @@
};
/* TBD: Temporary export of fdt globals - remove when code fully merged */
+extern int __initdata dt_root_addr_cells;
+extern int __initdata dt_root_size_cells;
extern struct boot_param_header *initial_boot_params;
/* For scanning the flat device-tree at boot time */
@@ -71,6 +73,10 @@
extern unsigned long of_get_flat_dt_root(void);
extern void early_init_dt_check_for_initrd(unsigned long node);
+/* Early flat tree scan hooks */
+extern int early_init_dt_scan_root(unsigned long node, const char *uname,
+ int depth, void *data);
+
/* Other Prototypes */
extern void finish_device_tree(void);
extern void unflatten_device_tree(void);
