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, 469 insertions, 0 deletions

diff --git a/scripts/dtc/libfdt/fdt_ro.c b/scripts/dtc/libfdt/fdt_ro.c
new file mode 100644
index 000000000000..fbbba44fcd0d
--- /dev/null
+++ b/scripts/dtc/libfdt/fdt_ro.c
@@ -0,0 +1,469 @@
+/*
+ * 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"
+
+static int _fdt_nodename_eq(const void *fdt, int offset,
+                            const char *s, int len)
+{
+        const char *p = fdt_offset_ptr(fdt, offset + FDT_TAGSIZE, len+1);
+
+        if (! p)
+                /* short match */
+                return 0;
+
+        if (memcmp(p, s, len) != 0)
+                return 0;
+
+        if (p[len] == '\0')
+                return 1;
+        else if (!memchr(s, '@', len) && (p[len] == '@'))
+                return 1;
+        else
+                return 0;
+}
+
+const char *fdt_string(const void *fdt, int stroffset)
+{
+        return (const char *)fdt + fdt_off_dt_strings(fdt) + stroffset;
+}
+
+int fdt_get_mem_rsv(const void *fdt, int n, uint64_t *address, uint64_t *size)
+{
+        FDT_CHECK_HEADER(fdt);
+        *address = fdt64_to_cpu(_fdt_mem_rsv(fdt, n)->address);
+        *size = fdt64_to_cpu(_fdt_mem_rsv(fdt, n)->size);
+        return 0;
+}
+
+int fdt_num_mem_rsv(const void *fdt)
+{
+        int i = 0;
+
+        while (fdt64_to_cpu(_fdt_mem_rsv(fdt, i)->size) != 0)
+                i++;
+        return i;
+}
+
+int fdt_subnode_offset_namelen(const void *fdt, int offset,
+                               const char *name, int namelen)
+{
+        int depth;
+
+        FDT_CHECK_HEADER(fdt);
+
+        for (depth = 0, offset = fdt_next_node(fdt, offset, &depth);
+             (offset >= 0) && (depth > 0);
+             offset = fdt_next_node(fdt, offset, &depth)) {
+                if (depth < 0)
+                        return -FDT_ERR_NOTFOUND;
+                else if ((depth == 1)
+                         && _fdt_nodename_eq(fdt, offset, name, namelen))
+                        return offset;
+        }
+
+        if (offset < 0)
+                return offset; /* error */
+        else
+                return -FDT_ERR_NOTFOUND;
+}
+
+int fdt_subnode_offset(const void *fdt, int parentoffset,
+                       const char *name)
+{
+        return fdt_subnode_offset_namelen(fdt, parentoffset, name, strlen(name));
+}
+
+int fdt_path_offset(const void *fdt, const char *path)
+{
+        const char *end = path + strlen(path);
+        const char *p = path;
+        int offset = 0;
+
+        FDT_CHECK_HEADER(fdt);
+
+        if (*path != '/')
+                return -FDT_ERR_BADPATH;
+
+        while (*p) {
+                const char *q;
+
+                while (*p == '/')
+                        p++;
+                if (! *p)
+                        return offset;
+                q = strchr(p, '/');
+                if (! q)
+                        q = end;
+
+                offset = fdt_subnode_offset_namelen(fdt, offset, p, q-p);
+                if (offset < 0)
+                        return offset;
+
+                p = q;
+        }
+
+        return offset;
+}
+
+const char *fdt_get_name(const void *fdt, int nodeoffset, int *len)
+{
+        const struct fdt_node_header *nh = _fdt_offset_ptr(fdt, nodeoffset);
+        int err;
+
+        if (((err = fdt_check_header(fdt)) != 0)
+            || ((err = _fdt_check_node_offset(fdt, nodeoffset)) < 0))
+                        goto fail;
+
+        if (len)
+                *len = strlen(nh->name);
+
+        return nh->name;
+
+ fail:
+        if (len)
+                *len = err;
+        return NULL;
+}
+
+const struct fdt_property *fdt_get_property(const void *fdt,
+                                            int nodeoffset,
+                                            const char *name, int *lenp)
+{
+        uint32_t tag;
+        const struct fdt_property *prop;
+        int namestroff;
+        int offset, nextoffset;
+        int err;
+
+        if (((err = fdt_check_header(fdt)) != 0)
+            || ((err = _fdt_check_node_offset(fdt, nodeoffset)) < 0))
+                        goto fail;
+
+        nextoffset = err;
+        do {
+                offset = nextoffset;
+
+                tag = fdt_next_tag(fdt, offset, &nextoffset);
+                switch (tag) {
+                case FDT_END:
+                        err = -FDT_ERR_TRUNCATED;
+                        goto fail;
+
+                case FDT_BEGIN_NODE:
+                case FDT_END_NODE:
+                case FDT_NOP:
+                        break;
+
+                case FDT_PROP:
+                        err = -FDT_ERR_BADSTRUCTURE;
+                        prop = fdt_offset_ptr(fdt, offset, sizeof(*prop));
+                        if (! prop)
+                                goto fail;
+                        namestroff = fdt32_to_cpu(prop->nameoff);
+                        if (strcmp(fdt_string(fdt, namestroff), name) == 0) {
+                                /* Found it! */
+                                int len = fdt32_to_cpu(prop->len);
+                                prop = fdt_offset_ptr(fdt, offset,
+                                                      sizeof(*prop)+len);
+                                if (! prop)
+                                        goto fail;
+
+                                if (lenp)
+                                        *lenp = len;
+
+                                return prop;
+                        }
+                        break;
+
+                default:
+                        err = -FDT_ERR_BADSTRUCTURE;
+                        goto fail;
+                }
+        } while ((tag != FDT_BEGIN_NODE) && (tag != FDT_END_NODE));
+
+        err = -FDT_ERR_NOTFOUND;
+ fail:
+        if (lenp)
+                *lenp = err;
+        return NULL;
+}
+
+const void *fdt_getprop(const void *fdt, int nodeoffset,
+                  const char *name, int *lenp)
+{
+        const struct fdt_property *prop;
+
+        prop = fdt_get_property(fdt, nodeoffset, name, lenp);
+        if (! prop)
+                return NULL;
+
+        return prop->data;
+}
+
+uint32_t fdt_get_phandle(const void *fdt, int nodeoffset)
+{
+        const uint32_t *php;
+        int len;
+
+        php = fdt_getprop(fdt, nodeoffset, "linux,phandle", &len);
+        if (!php || (len != sizeof(*php)))
+                return 0;
+
+        return fdt32_to_cpu(*php);
+}
+
+int fdt_get_path(const void *fdt, int nodeoffset, char *buf, int buflen)
+{
+        int pdepth = 0, p = 0;
+        int offset, depth, namelen;
+        const char *name;
+
+        FDT_CHECK_HEADER(fdt);
+
+        if (buflen < 2)
+                return -FDT_ERR_NOSPACE;
+
+        for (offset = 0, depth = 0;
+             (offset >= 0) && (offset <= nodeoffset);
+             offset = fdt_next_node(fdt, offset, &depth)) {
+                if (pdepth < depth)
+                        continue; /* overflowed buffer */
+
+                while (pdepth > depth) {
+                        do {
+                                p--;
+                        } while (buf[p-1] != '/');
+                        pdepth--;
+                }
+
+                name = fdt_get_name(fdt, offset, &namelen);
+                if (!name)
+                        return namelen;
+                if ((p + namelen + 1) <= buflen) {
+                        memcpy(buf + p, name, namelen);
+                        p += namelen;
+                        buf[p++] = '/';
+                        pdepth++;
+                }
+
+                if (offset == nodeoffset) {
+                        if (pdepth < (depth + 1))
+                                return -FDT_ERR_NOSPACE;
+
+                        if (p > 1) /* special case so that root path is "/", not "" */
+                                p--;
+                        buf[p] = '\0';
+                        return p;
+                }
+        }
+
+        if ((offset == -FDT_ERR_NOTFOUND) || (offset >= 0))
+                return -FDT_ERR_BADOFFSET;
+        else if (offset == -FDT_ERR_BADOFFSET)
+                return -FDT_ERR_BADSTRUCTURE;
+
+        return offset; /* error from fdt_next_node() */
+}
+
+int fdt_supernode_atdepth_offset(const void *fdt, int nodeoffset,
+                                 int supernodedepth, int *nodedepth)
+{
+        int offset, depth;
+        int supernodeoffset = -FDT_ERR_INTERNAL;
+
+        FDT_CHECK_HEADER(fdt);
+
+        if (supernodedepth < 0)
+                return -FDT_ERR_NOTFOUND;
+
+        for (offset = 0, depth = 0;
+             (offset >= 0) && (offset <= nodeoffset);
+             offset = fdt_next_node(fdt, offset, &depth)) {
+                if (depth == supernodedepth)
+                        supernodeoffset = offset;
+
+                if (offset == nodeoffset) {
+                        if (nodedepth)
+                                *nodedepth = depth;
+
+                        if (supernodedepth > depth)
+                                return -FDT_ERR_NOTFOUND;
+                        else
+                                return supernodeoffset;
+                }
+        }
+
+        if ((offset == -FDT_ERR_NOTFOUND) || (offset >= 0))
+                return -FDT_ERR_BADOFFSET;
+        else if (offset == -FDT_ERR_BADOFFSET)
+                return -FDT_ERR_BADSTRUCTURE;
+
+        return offset; /* error from fdt_next_node() */
+}
+
+int fdt_node_depth(const void *fdt, int nodeoffset)
+{
+        int nodedepth;
+        int err;
+
+        err = fdt_supernode_atdepth_offset(fdt, nodeoffset, 0, &nodedepth);
+        if (err)
+                return (err < 0) ? err : -FDT_ERR_INTERNAL;
+        return nodedepth;
+}
+
+int fdt_parent_offset(const void *fdt, int nodeoffset)
+{
+        int nodedepth = fdt_node_depth(fdt, nodeoffset);
+
+        if (nodedepth < 0)
+                return nodedepth;
+        return fdt_supernode_atdepth_offset(fdt, nodeoffset,
+                                            nodedepth - 1, NULL);
+}
+
+int fdt_node_offset_by_prop_value(const void *fdt, int startoffset,
+                                  const char *propname,
+                                  const void *propval, int proplen)
+{
+        int offset;
+        const void *val;
+        int len;
+
+        FDT_CHECK_HEADER(fdt);
+
+        /* FIXME: The algorithm here is pretty horrible: we scan each
+         * property of a node in fdt_getprop(), then if that didn't
+         * find what we want, we scan over them again making our way
+         * to the next node.  Still it's the easiest to implement
+         * approach; performance can come later. */
+        for (offset = fdt_next_node(fdt, startoffset, NULL);
+             offset >= 0;
+             offset = fdt_next_node(fdt, offset, NULL)) {
+                val = fdt_getprop(fdt, offset, propname, &len);
+                if (val && (len == proplen)
+                    && (memcmp(val, propval, len) == 0))
+                        return offset;
+        }
+
+        return offset; /* error from fdt_next_node() */
+}
+
+int fdt_node_offset_by_phandle(const void *fdt, uint32_t phandle)
+{
+        if ((phandle == 0) || (phandle == -1))
+                return -FDT_ERR_BADPHANDLE;
+        phandle = cpu_to_fdt32(phandle);
+        return fdt_node_offset_by_prop_value(fdt, -1, "linux,phandle",
+                                             &phandle, sizeof(phandle));
+}
+
+int _stringlist_contains(const char *strlist, int listlen, const char *str)
+{
+        int len = strlen(str);
+        const char *p;
+
+        while (listlen >= len) {
+                if (memcmp(str, strlist, len+1) == 0)
+                        return 1;
+                p = memchr(strlist, '\0', listlen);
+                if (!p)
+                        return 0; /* malformed strlist.. */
+                listlen -= (p-strlist) + 1;
+                strlist = p + 1;
+        }
+        return 0;
+}
+
+int fdt_node_check_compatible(const void *fdt, int nodeoffset,
+                              const char *compatible)
+{
+        const void *prop;
+        int len;
+
+        prop = fdt_getprop(fdt, nodeoffset, "compatible", &len);
+        if (!prop)
+                return len;
+        if (_stringlist_contains(prop, len, compatible))
+                return 0;
+        else
+                return 1;
+}
+
+int fdt_node_offset_by_compatible(const void *fdt, int startoffset,
+                                  const char *compatible)
+{
+        int offset, err;
+
+        FDT_CHECK_HEADER(fdt);
+
+        /* FIXME: The algorithm here is pretty horrible: we scan each
+         * property of a node in fdt_node_check_compatible(), then if
+         * that didn't find what we want, we scan over them again
+         * making our way to the next node.  Still it's the easiest to
+         * implement approach; performance can come later. */
+        for (offset = fdt_next_node(fdt, startoffset, NULL);
+             offset >= 0;
+             offset = fdt_next_node(fdt, offset, NULL)) {
+                err = fdt_node_check_compatible(fdt, offset, compatible);
+                if ((err < 0) && (err != -FDT_ERR_NOTFOUND))
+                        return err;
+                else if (err == 0)
+                        return offset;
+        }
+
+        return offset; /* error from fdt_next_node() */
+}