Move dtc and libfdt sources from arch/powerpc/boot to scripts/dtc

The powerpc kernel always requires an Open Firmware like device tree
to supply device information.  On systems without OF, this comes from
a flattened device tree blob.  This blob is usually generated by dtc,
a tool which compiles a text description of the device tree into the
flattened format used by the kernel.  Sometimes, the bootwrapper makes
small changes to the pre-compiled device tree blob (e.g. filling in
the size of RAM).  To do this it uses the libfdt library.

Because these are only used on powerpc, the code for both these tools
is included under arch/powerpc/boot (these were imported and are
periodically updated from the upstream dtc tree).

However, the microblaze architecture, currently being prepared for
merging to mainline also uses dtc to produce device tree blobs.  A few
other archs have also mentioned some interest in using dtc.
Therefore, this patch moves dtc and libfdt from arch/powerpc into
scripts, where it can be used by any architecture.

The vast bulk of this patch is a literal move, the rest is adjusting
the various Makefiles to use dtc and libfdt correctly from their new
locations.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 116 insertions, 0 deletions

diff --git a/scripts/dtc/srcpos.c b/scripts/dtc/srcpos.c
new file mode 100644
index 0000000..9641b76
--- /dev/null
+++ b/scripts/dtc/srcpos.c
@@ -0,0 +1,116 @@
+/*
+ * Copyright 2007 Jon Loeliger, Freescale Semiconductor, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
+ *                                                                   USA
+ */
+
+#include "dtc.h"
+#include "srcpos.h"
+
+/*
+ * Like yylineno, this is the current open file pos.
+ */
+
+struct dtc_file *srcpos_file;
+
+static int dtc_open_one(struct dtc_file *file,
+                        const char *search,
+                        const char *fname)
+{
+	char *fullname;
+
+	if (search) {
+		fullname = xmalloc(strlen(search) + strlen(fname) + 2);
+
+		strcpy(fullname, search);
+		strcat(fullname, "/");
+		strcat(fullname, fname);
+	} else {
+		fullname = strdup(fname);
+	}
+
+	file->file = fopen(fullname, "r");
+	if (!file->file) {
+		free(fullname);
+		return 0;
+	}
+
+	file->name = fullname;
+	return 1;
+}
+
+
+struct dtc_file *dtc_open_file(const char *fname,
+                               const struct search_path *search)
+{
+	static const struct search_path default_search = { NULL, NULL, NULL };
+
+	struct dtc_file *file;
+	const char *slash;
+
+	file = xmalloc(sizeof(struct dtc_file));
+
+	slash = strrchr(fname, '/');
+	if (slash) {
+		char *dir = xmalloc(slash - fname + 1);
+
+		memcpy(dir, fname, slash - fname);
+		dir[slash - fname] = 0;
+		file->dir = dir;
+	} else {
+		file->dir = NULL;
+	}
+
+	if (streq(fname, "-")) {
+		file->name = "stdin";
+		file->file = stdin;
+		return file;
+	}
+
+	if (fname[0] == '/') {
+		file->file = fopen(fname, "r");
+		if (!file->file)
+			goto fail;
+
+		file->name = strdup(fname);
+		return file;
+	}
+
+	if (!search)
+		search = &default_search;
+
+	while (search) {
+		if (dtc_open_one(file, search->dir, fname))
+			return file;
+
+		if (errno != ENOENT)
+			goto fail;
+
+		search = search->next;
+	}
+
+fail:
+	die("Couldn't open \"%s\": %s\n", fname, strerror(errno));
+}
+
+void dtc_close_file(struct dtc_file *file)
+{
+	if (fclose(file->file))
+		die("Error closing \"%s\": %s\n", file->name, strerror(errno));
+
+	free(file->dir);
+	free(file);
+}