mtd: Add MTD concat support to concatenate multiple MTD NOR devices

This patch adds concatenation support to the U-Boot MTD infrastructure.
By enabling CONFIG_MTD_CONCAT this MTD CFI wrapper will concatenate
all found NOR devices into one single MTD device. This can be used by
e.g by UBI to access a partition that spans over multiple NOR chips.

Signed-off-by: Stefan Roese <sr@denx.de>

include/linux/mtd/compat.h

@@ -19,11 +19,15 @@
 
 #define kmalloc(size, flags)	malloc(size)
 #define kzalloc(size, flags)	calloc(size, 1)
-#define vmalloc(size)			malloc(size)
-#define kfree(ptr)				free(ptr)
-#define vfree(ptr)				free(ptr)
+#define vmalloc(size)		malloc(size)
+#define kfree(ptr)		free(ptr)
+#define vfree(ptr)		free(ptr)
 
-#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
+#define DECLARE_WAITQUEUE(...)	do { } while (0)
+#define add_wait_queue(...)	do { } while (0)
+#define remove_wait_queue(...)	do { } while (0)
+
+#define KERNEL_VERSION(a,b,c)	(((a) << 16) + ((b) << 8) + (c))
 
 /*
  * ..and if you can't take the strict

include/linux/mtd/concat.h

@@ -0,0 +1,21 @@
+/*
+ * MTD device concatenation layer definitions
+ *
+ * (C) 2002 Robert Kaiser <rkaiser@sysgo.de>
+ *
+ * This code is GPL
+ */
+
+#ifndef MTD_CONCAT_H
+#define MTD_CONCAT_H
+
+
+struct mtd_info *mtd_concat_create(
+    struct mtd_info *subdev[],  /* subdevices to concatenate */
+    int num_devs,               /* number of subdevices      */
+    const char *name);          /* name for the new device   */
+
+void mtd_concat_destroy(struct mtd_info *mtd);
+
+#endif
+