Compile libfdt for barebox

libfdt can be useful for very early device tree parsing, so compile it
for barobox aswell. This is done the same way as done in the Kernel:
we put C files with the same name as in libfdt into lib/ and just
include the libfdt files from there.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

3 files changed, 28 insertions, 68 deletions

diff --git a/include/fdt.h b/include/fdt.h
index 1ccd4c6734..38a2d27b02 100644
--- a/include/fdt.h
+++ b/include/fdt.h
@@ -3,73 +3,6 @@
 
 #include <linux/types.h>
 
-#ifndef __ASSEMBLY__
-
-#define _B(n)	((unsigned long long)((uint8_t *)&x)[n])
-
-#define fdt32_to_cpu(x)	be32_to_cpu(x)
-#define cpu_to_fdt32(x) cpu_to_be32(x)
-
-static inline uint64_t fdt64_to_cpu(uint64_t x)
-{
-	return (_B(0) << 56) | (_B(1) << 48) | (_B(2) << 40) | (_B(3) << 32)
-		| (_B(4) << 24) | (_B(5) << 16) | (_B(6) << 8) | _B(7);
-}
-#define cpu_to_fdt64(x) fdt64_to_cpu(x)
-#undef _B
-
-struct fdt_header {
-	uint32_t magic;			 /* magic word FDT_MAGIC */
-	uint32_t totalsize;		 /* total size of DT block */
-	uint32_t off_dt_struct;		 /* offset to structure */
-	uint32_t off_dt_strings;	 /* offset to strings */
-	uint32_t off_mem_rsvmap;	 /* offset to memory reserve map */
-	uint32_t version;		 /* format version */
-	uint32_t last_comp_version;	 /* last compatible version */
-
-	/* version 2 fields below */
-	uint32_t boot_cpuid_phys;	 /* Which physical CPU id we're
-					    booting on */
-	/* version 3 fields below */
-	uint32_t size_dt_strings;	 /* size of the strings block */
-
-	/* version 17 fields below */
-	uint32_t size_dt_struct;	 /* size of the structure block */
-};
-
-struct fdt_reserve_entry {
-	uint64_t address;
-	uint64_t size;
-};
-
-struct fdt_node_header {
-	uint32_t tag;
-	char name[0];
-};
-
-struct fdt_property {
-	uint32_t tag;
-	uint32_t len;
-	uint32_t nameoff;
-	char data[0];
-};
-
-#endif /* !__ASSEMBLY */
-
-#define FDT_MAGIC	0xd00dfeed	/* 4: version, 4: total size */
-#define FDT_TAGSIZE	sizeof(uint32_t)
-
-#define FDT_BEGIN_NODE	0x1		/* Start node: full name */
-#define FDT_END_NODE	0x2		/* End node */
-#define FDT_PROP	0x3		/* Property: name off,
-					   size, content */
-#define FDT_NOP		0x4		/* nop */
-#define FDT_END		0x9
-
-#define FDT_V1_SIZE	(7*sizeof(uint32_t))
-#define FDT_V2_SIZE	(FDT_V1_SIZE + sizeof(uint32_t))
-#define FDT_V3_SIZE	(FDT_V2_SIZE + sizeof(uint32_t))
-#define FDT_V16_SIZE	FDT_V3_SIZE
-#define FDT_V17_SIZE	(FDT_V16_SIZE + sizeof(uint32_t))
+#include <linux/libfdt.h>
 
 #endif /* _FDT_H */
diff --git a/include/linux/libfdt.h b/include/linux/libfdt.h
new file mode 100644
index 0000000000..ef2467213b
--- /dev/null
+++ b/include/linux/libfdt.h
@@ -0,0 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _INCLUDE_LIBFDT_H_
+#define _INCLUDE_LIBFDT_H_
+
+#include <linux/libfdt_env.h>
+#include "../scripts/dtc/libfdt/libfdt.h"
+
+#endif /* _INCLUDE_LIBFDT_H_ */
diff --git a/include/linux/libfdt_env.h b/include/linux/libfdt_env.h
new file mode 100644
index 0000000000..edb0f0c309
--- /dev/null
+++ b/include/linux/libfdt_env.h
@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef LIBFDT_ENV_H
+#define LIBFDT_ENV_H
+
+#include <linux/kernel.h>	/* For INT_MAX */
+#include <linux/string.h>
+
+#include <asm/byteorder.h>
+
+typedef __be16 fdt16_t;
+typedef __be32 fdt32_t;
+typedef __be64 fdt64_t;
+
+#define fdt32_to_cpu(x) be32_to_cpu(x)
+#define cpu_to_fdt32(x) cpu_to_be32(x)
+#define fdt64_to_cpu(x) be64_to_cpu(x)
+#define cpu_to_fdt64(x) cpu_to_be64(x)
+
+#endif /* LIBFDT_ENV_H */