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, 201 insertions, 0 deletions

diff --git a/scripts/dtc/libfdt/fdt.c b/scripts/dtc/libfdt/fdt.c
new file mode 100644
index 000000000000..2acaec5923ae
--- /dev/null
+++ b/scripts/dtc/libfdt/fdt.c
@@ -0,0 +1,201 @@
+/*
+ * libfdt - Flat Device Tree manipulation
+ * Copyright (C) 2006 David Gibson, IBM Corporation.
+ *
+ * libfdt is dual licensed: you can use it either under the terms of
+ * the GPL, or the BSD license, at your option.
+ *
+ *  a) This library 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 library 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 library; if not, write to the Free
+ *     Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
+ *     MA 02110-1301 USA
+ *
+ * Alternatively,
+ *
+ *  b) Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *     1. Redistributions of source code must retain the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer.
+ *     2. Redistributions in binary form must reproduce the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+ *     CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ *     INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ *     MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ *     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ *     CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *     SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ *     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ *     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ *     HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ *     OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+ *     EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#include "libfdt_env.h"
+
+#include <fdt.h>
+#include <libfdt.h>
+
+#include "libfdt_internal.h"
+
+int fdt_check_header(const void *fdt)
+{
+        if (fdt_magic(fdt) == FDT_MAGIC) {
+                /* Complete tree */
+                if (fdt_version(fdt) < FDT_FIRST_SUPPORTED_VERSION)
+                        return -FDT_ERR_BADVERSION;
+                if (fdt_last_comp_version(fdt) > FDT_LAST_SUPPORTED_VERSION)
+                        return -FDT_ERR_BADVERSION;
+        } else if (fdt_magic(fdt) == FDT_SW_MAGIC) {
+                /* Unfinished sequential-write blob */
+                if (fdt_size_dt_struct(fdt) == 0)
+                        return -FDT_ERR_BADSTATE;
+        } else {
+                return -FDT_ERR_BADMAGIC;
+        }
+
+        return 0;
+}
+
+const void *fdt_offset_ptr(const void *fdt, int offset, int len)
+{
+        const char *p;
+
+        if (fdt_version(fdt) >= 0x11)
+                if (((offset + len) < offset)
+                    || ((offset + len) > fdt_size_dt_struct(fdt)))
+                        return NULL;
+
+        p = _fdt_offset_ptr(fdt, offset);
+
+        if (p + len < p)
+                return NULL;
+        return p;
+}
+
+uint32_t fdt_next_tag(const void *fdt, int offset, int *nextoffset)
+{
+        const uint32_t *tagp, *lenp;
+        uint32_t tag;
+        const char *p;
+
+        if (offset % FDT_TAGSIZE)
+                return -1;
+
+        tagp = fdt_offset_ptr(fdt, offset, FDT_TAGSIZE);
+        if (! tagp)
+                return FDT_END; /* premature end */
+        tag = fdt32_to_cpu(*tagp);
+        offset += FDT_TAGSIZE;
+
+        switch (tag) {
+        case FDT_BEGIN_NODE:
+                /* skip name */
+                do {
+                        p = fdt_offset_ptr(fdt, offset++, 1);
+                } while (p && (*p != '\0'));
+                if (! p)
+                        return FDT_END;
+                break;
+        case FDT_PROP:
+                lenp = fdt_offset_ptr(fdt, offset, sizeof(*lenp));
+                if (! lenp)
+                        return FDT_END;
+                /* skip name offset, length and value */
+                offset += 2*FDT_TAGSIZE + fdt32_to_cpu(*lenp);
+                break;
+        }
+
+        if (nextoffset)
+                *nextoffset = FDT_TAGALIGN(offset);
+
+        return tag;
+}
+
+int _fdt_check_node_offset(const void *fdt, int offset)
+{
+        if ((offset < 0) || (offset % FDT_TAGSIZE)
+            || (fdt_next_tag(fdt, offset, &offset) != FDT_BEGIN_NODE))
+                return -FDT_ERR_BADOFFSET;
+
+        return offset;
+}
+
+int fdt_next_node(const void *fdt, int offset, int *depth)
+{
+        int nextoffset = 0;
+        uint32_t tag;
+
+        if (offset >= 0)
+                if ((nextoffset = _fdt_check_node_offset(fdt, offset)) < 0)
+                        return nextoffset;
+
+        do {
+                offset = nextoffset;
+                tag = fdt_next_tag(fdt, offset, &nextoffset);
+
+                switch (tag) {
+                case FDT_PROP:
+                case FDT_NOP:
+                        break;
+
+                case FDT_BEGIN_NODE:
+                        if (depth)
+                                (*depth)++;
+                        break;
+
+                case FDT_END_NODE:
+                        if (depth)
+                                (*depth)--;
+                        break;
+
+                case FDT_END:
+                        return -FDT_ERR_NOTFOUND;
+
+                default:
+                        return -FDT_ERR_BADSTRUCTURE;
+                }
+        } while (tag != FDT_BEGIN_NODE);
+
+        return offset;
+}
+
+const char *_fdt_find_string(const char *strtab, int tabsize, const char *s)
+{
+        int len = strlen(s) + 1;
+        const char *last = strtab + tabsize - len;
+        const char *p;
+
+        for (p = strtab; p <= last; p++)
+                if (memcmp(p, s, len) == 0)
+                        return p;
+        return NULL;
+}
+
+int fdt_move(const void *fdt, void *buf, int bufsize)
+{
+        FDT_CHECK_HEADER(fdt);
+
+        if (fdt_totalsize(fdt) > bufsize)
+                return -FDT_ERR_NOSPACE;
+
+        memmove(buf, fdt, fdt_totalsize(fdt));
+        return 0;
+}