--- a/drivers/mtd/maps/physmap.c
+++ b/drivers/mtd/maps/physmap.c
@@ -31,6 +31,66 @@ struct physmap_flash_info {
 	int			vpp_refcnt;
 };
 
+static struct platform_device *physmap_map2pdev(struct map_info *map)
+{
+	return (struct platform_device *) map->map_priv_1;
+}
+
+static void physmap_lock(struct map_info *map)
+{
+	struct platform_device *pdev;
+	struct physmap_flash_data *physmap_data;
+
+	pdev = physmap_map2pdev(map);
+	physmap_data = pdev->dev.platform_data;
+	physmap_data->lock(pdev);
+}
+
+static void physmap_unlock(struct map_info *map)
+{
+	struct platform_device *pdev;
+	struct physmap_flash_data *physmap_data;
+
+	pdev = physmap_map2pdev(map);
+	physmap_data = pdev->dev.platform_data;
+	physmap_data->unlock(pdev);
+}
+
+static map_word physmap_flash_read_lock(struct map_info *map, unsigned long ofs)
+{
+	map_word ret;
+
+	physmap_lock(map);
+	ret = inline_map_read(map, ofs);
+	physmap_unlock(map);
+
+	return ret;
+}
+
+static void physmap_flash_write_lock(struct map_info *map, map_word d,
+				     unsigned long ofs)
+{
+	physmap_lock(map);
+	inline_map_write(map, d, ofs);
+	physmap_unlock(map);
+}
+
+static void physmap_flash_copy_from_lock(struct map_info *map, void *to,
+					 unsigned long from, ssize_t len)
+{
+	physmap_lock(map);
+	inline_map_copy_from(map, to, from, len);
+	physmap_unlock(map);
+}
+
+static void physmap_flash_copy_to_lock(struct map_info *map, unsigned long to,
+				       const void *from, ssize_t len)
+{
+	physmap_lock(map);
+	inline_map_copy_to(map, to, from, len);
+	physmap_unlock(map);
+}
+
 static int physmap_flash_remove(struct platform_device *dev)
 {
 	struct physmap_flash_info *info;
@@ -154,6 +214,13 @@ static int physmap_flash_probe(struct pl
 
 		simple_map_init(&info->map[i]);
 
+		if (physmap_data->lock && physmap_data->unlock) {
+			info->map[i].read = physmap_flash_read_lock;
+			info->map[i].write = physmap_flash_write_lock;
+			info->map[i].copy_from = physmap_flash_copy_from_lock;
+			info->map[i].copy_to = physmap_flash_copy_to_lock;
+		}
+
 		probe_type = rom_probe_types;
 		if (physmap_data->probe_type == NULL) {
 			for (; info->mtd[i] == NULL && *probe_type != NULL; probe_type++)
--- a/include/linux/mtd/physmap.h
+++ b/include/linux/mtd/physmap.h
@@ -25,6 +25,8 @@ struct physmap_flash_data {
 	unsigned int		width;
 	int			(*init)(struct platform_device *);
 	void			(*exit)(struct platform_device *);
+	void			(*lock)(struct platform_device *);
+	void			(*unlock)(struct platform_device *);
 	void			(*set_vpp)(struct platform_device *, int);
 	unsigned int		nr_parts;
 	unsigned int		pfow_base;