584 lines
12 KiB
C
584 lines
12 KiB
C
|
/*
|
||
|
|
* 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"
|
||
|
|
|
||
|
|
#define CHECK_HEADER(fdt) \
|
||
|
|
{ \
|
||
|
|
int err; \
|
||
|
|
if ((err = fdt_check_header(fdt)) != 0) \
|
||
|
|
return err; \
|
||
|
|
}
|
||
|
|
|
||
|
|
static int nodename_eq(const void *fdt, int offset,
|
||
|
|
const char *s, int len)
|
||
|
|
{
|
||
|
|
const char *p = fdt_offset_ptr(fdt, offset, 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 (char *)fdt + fdt_off_dt_strings(fdt) + stroffset;
|
||
|
|
}
|
||
|
|
|
||
|
|
int fdt_get_mem_rsv(const void *fdt, int n, uint64_t *address, uint64_t *size)
|
||
|
|
{
|
||
|
|
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 parentoffset,
|
||
|
|
const char *name, int namelen)
|
||
|
|
{
|
||
|
|
int level = 0;
|
||
|
|
uint32_t tag;
|
||
|
|
int offset, nextoffset;
|
||
|
|
|
||
|
|
CHECK_HEADER(fdt);
|
||
|
|
|
||
|
|
tag = fdt_next_tag(fdt, parentoffset, &nextoffset);
|
||
|
|
if (tag != FDT_BEGIN_NODE)
|
||
|
|
return -FDT_ERR_BADOFFSET;
|
||
|
|
|
||
|
|
do {
|
||
|
|
offset = nextoffset;
|
||
|
|
tag = fdt_next_tag(fdt, offset, &nextoffset);
|
||
|
|
|
||
|
|
switch (tag) {
|
||
|
|
case FDT_END:
|
||
|
|
return -FDT_ERR_TRUNCATED;
|
||
|
|
|
||
|
|
case FDT_BEGIN_NODE:
|
||
|
|
level++;
|
||
|
|
if (level != 1)
|
||
|
|
continue;
|
||
|
|
if (nodename_eq(fdt, offset+FDT_TAGSIZE, name, namelen))
|
||
|
|
/* Found it! */
|
||
|
|
return offset;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case FDT_END_NODE:
|
||
|
|
level--;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case FDT_PROP:
|
||
|
|
case FDT_NOP:
|
||
|
|
break;
|
||
|
|
|
||
|
|
default:
|
||
|
|
return -FDT_ERR_BADSTRUCTURE;
|
||
|
|
}
|
||
|
|
} while (level >= 0);
|
||
|
|
|
||
|
|
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;
|
||
|
|
|
||
|
|
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;
|
||
|
|
int err;
|
||
|
|
|
||
|
|
if ((err = fdt_check_header(fdt)) != 0)
|
||
|
|
goto fail;
|
||
|
|
|
||
|
|
err = -FDT_ERR_BADOFFSET;
|
||
|
|
nh = fdt_offset_ptr(fdt, nodeoffset, sizeof(*nh));
|
||
|
|
if (!nh || (fdt32_to_cpu(nh->tag) != FDT_BEGIN_NODE))
|
||
|
|
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)
|
||
|
|
goto fail;
|
||
|
|
|
||
|
|
err = -FDT_ERR_BADOFFSET;
|
||
|
|
if (nodeoffset % FDT_TAGSIZE)
|
||
|
|
goto fail;
|
||
|
|
|
||
|
|
tag = fdt_next_tag(fdt, nodeoffset, &nextoffset);
|
||
|
|
if (tag != FDT_BEGIN_NODE)
|
||
|
|
goto fail;
|
||
|
|
|
||
|
|
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 (streq(fdt_string(fdt, namestroff), name)) {
|
||
|
|
/* 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)
|
||
|
|
{
|
||
|
|
uint32_t tag;
|
||
|
|
int p = 0, overflow = 0;
|
||
|
|
int offset, nextoffset, namelen;
|
||
|
|
const char *name;
|
||
|
|
|
||
|
|
CHECK_HEADER(fdt);
|
||
|
|
|
||
|
|
tag = fdt_next_tag(fdt, 0, &nextoffset);
|
||
|
|
if (tag != FDT_BEGIN_NODE)
|
||
|
|
return -FDT_ERR_BADSTRUCTURE;
|
||
|
|
|
||
|
|
if (buflen < 2)
|
||
|
|
return -FDT_ERR_NOSPACE;
|
||
|
|
buf[0] = '/';
|
||
|
|
p = 1;
|
||
|
|
|
||
|
|
while (nextoffset <= nodeoffset) {
|
||
|
|
offset = nextoffset;
|
||
|
|
tag = fdt_next_tag(fdt, offset, &nextoffset);
|
||
|
|
switch (tag) {
|
||
|
|
case FDT_END:
|
||
|
|
return -FDT_ERR_BADOFFSET;
|
||
|
|
|
||
|
|
case FDT_BEGIN_NODE:
|
||
|
|
name = fdt_get_name(fdt, offset, &namelen);
|
||
|
|
if (!name)
|
||
|
|
return namelen;
|
||
|
|
if (overflow || ((p + namelen + 1) > buflen)) {
|
||
|
|
overflow++;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
memcpy(buf + p, name, namelen);
|
||
|
|
p += namelen;
|
||
|
|
buf[p++] = '/';
|
||
|
|
break;
|
||
|
|
|
||
|
|
case FDT_END_NODE:
|
||
|
|
if (overflow) {
|
||
|
|
overflow--;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
do {
|
||
|
|
p--;
|
||
|
|
} while (buf[p-1] != '/');
|
||
|
|
break;
|
||
|
|
|
||
|
|
case FDT_PROP:
|
||
|
|
case FDT_NOP:
|
||
|
|
break;
|
||
|
|
|
||
|
|
default:
|
||
|
|
return -FDT_ERR_BADSTRUCTURE;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (overflow)
|
||
|
|
return -FDT_ERR_NOSPACE;
|
||
|
|
|
||
|
|
if (p > 1) /* special case so that root path is "/", not "" */
|
||
|
|
p--;
|
||
|
|
buf[p] = '\0';
|
||
|
|
return p;
|
||
|
|
}
|
||
|
|
|
||
|
|
int fdt_supernode_atdepth_offset(const void *fdt, int nodeoffset,
|
||
|
|
int supernodedepth, int *nodedepth)
|
||
|
|
{
|
||
|
|
int level = -1;
|
||
|
|
uint32_t tag;
|
||
|
|
int offset, nextoffset = 0;
|
||
|
|
int supernodeoffset = -FDT_ERR_INTERNAL;
|
||
|
|
|
||
|
|
CHECK_HEADER(fdt);
|
||
|
|
|
||
|
|
if (supernodedepth < 0)
|
||
|
|
return -FDT_ERR_NOTFOUND;
|
||
|
|
|
||
|
|
do {
|
||
|
|
offset = nextoffset;
|
||
|
|
tag = fdt_next_tag(fdt, offset, &nextoffset);
|
||
|
|
switch (tag) {
|
||
|
|
case FDT_END:
|
||
|
|
return -FDT_ERR_BADOFFSET;
|
||
|
|
|
||
|
|
case FDT_BEGIN_NODE:
|
||
|
|
level++;
|
||
|
|
if (level == supernodedepth)
|
||
|
|
supernodeoffset = offset;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case FDT_END_NODE:
|
||
|
|
level--;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case FDT_PROP:
|
||
|
|
case FDT_NOP:
|
||
|
|
break;
|
||
|
|
|
||
|
|
default:
|
||
|
|
return -FDT_ERR_BADSTRUCTURE;
|
||
|
|
}
|
||
|
|
} while (offset < nodeoffset);
|
||
|
|
|
||
|
|
if (nodedepth)
|
||
|
|
*nodedepth = level;
|
||
|
|
|
||
|
|
if (supernodedepth > level)
|
||
|
|
return -FDT_ERR_NOTFOUND;
|
||
|
|
return supernodeoffset;
|
||
|
|
}
|
||
|
|
|
||
|
|
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)
|
||
|
|
{
|
||
|
|
uint32_t tag;
|
||
|
|
int offset, nextoffset;
|
||
|
|
const void *val;
|
||
|
|
int len;
|
||
|
|
|
||
|
|
CHECK_HEADER(fdt);
|
||
|
|
|
||
|
|
if (startoffset >= 0) {
|
||
|
|
tag = fdt_next_tag(fdt, startoffset, &nextoffset);
|
||
|
|
if (tag != FDT_BEGIN_NODE)
|
||
|
|
return -FDT_ERR_BADOFFSET;
|
||
|
|
} else {
|
||
|
|
nextoffset = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* 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. */
|
||
|
|
do {
|
||
|
|
offset = nextoffset;
|
||
|
|
tag = fdt_next_tag(fdt, offset, &nextoffset);
|
||
|
|
|
||
|
|
switch (tag) {
|
||
|
|
case FDT_BEGIN_NODE:
|
||
|
|
val = fdt_getprop(fdt, offset, propname, &len);
|
||
|
|
if (val
|
||
|
|
&& (len == proplen)
|
||
|
|
&& (memcmp(val, propval, len) == 0))
|
||
|
|
return offset;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case FDT_PROP:
|
||
|
|
case FDT_END:
|
||
|
|
case FDT_END_NODE:
|
||
|
|
case FDT_NOP:
|
||
|
|
break;
|
||
|
|
|
||
|
|
default:
|
||
|
|
return -FDT_ERR_BADSTRUCTURE;
|
||
|
|
}
|
||
|
|
} while (tag != FDT_END);
|
||
|
|
|
||
|
|
return -FDT_ERR_NOTFOUND;
|
||
|
|
}
|
||
|
|
|
||
|
|
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 void *strlist, int listlen, const char *str)
|
||
|
|
{
|
||
|
|
int len = strlen(str);
|
||
|
|
const void *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)
|
||
|
|
{
|
||
|
|
uint32_t tag;
|
||
|
|
int offset, nextoffset;
|
||
|
|
int err;
|
||
|
|
|
||
|
|
CHECK_HEADER(fdt);
|
||
|
|
|
||
|
|
if (startoffset >= 0) {
|
||
|
|
tag = fdt_next_tag(fdt, startoffset, &nextoffset);
|
||
|
|
if (tag != FDT_BEGIN_NODE)
|
||
|
|
return -FDT_ERR_BADOFFSET;
|
||
|
|
} else {
|
||
|
|
nextoffset = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* 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. */
|
||
|
|
do {
|
||
|
|
offset = nextoffset;
|
||
|
|
tag = fdt_next_tag(fdt, offset, &nextoffset);
|
||
|
|
|
||
|
|
switch (tag) {
|
||
|
|
case FDT_BEGIN_NODE:
|
||
|
|
err = fdt_node_check_compatible(fdt, offset,
|
||
|
|
compatible);
|
||
|
|
if ((err < 0)
|
||
|
|
&& (err != -FDT_ERR_NOTFOUND))
|
||
|
|
return err;
|
||
|
|
else if (err == 0)
|
||
|
|
return offset;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case FDT_PROP:
|
||
|
|
case FDT_END:
|
||
|
|
case FDT_END_NODE:
|
||
|
|
case FDT_NOP:
|
||
|
|
break;
|
||
|
|
|
||
|
|
default:
|
||
|
|
return -FDT_ERR_BADSTRUCTURE;
|
||
|
|
}
|
||
|
|
} while (tag != FDT_END);
|
||
|
|
|
||
|
|
return -FDT_ERR_NOTFOUND;
|
||
|
|
}
|