LXR linux/scripts/dtc/libfdt/fdt

   1/*
   2 * libfdt - Flat Device Tree manipulation
   3 * Copyright (C) 2006 David Gibson, IBM Corporation.
   4 *
   5 * libfdt is dual licensed: you can use it either under the terms of
   6 * the GPL, or the BSD license, at your option.
   7 *
   8 *  a) This library is free software; you can redistribute it and/or
   9 *     modify it under the terms of the GNU General Public License as
  10 *     published by the Free Software Foundation; either version 2 of the
  11 *     License, or (at your option) any later version.
  12 *
  13 *     This library is distributed in the hope that it will be useful,
  14 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 *     GNU General Public License for more details.
  17 *
  18 *     You should have received a copy of the GNU General Public
  19 *     License along with this library; if not, write to the Free
  20 *     Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
  21 *     MA 02110-1301 USA
  22 *
  23 * Alternatively,
  24 *
  25 *  b) Redistribution and use in source and binary forms, with or
  26 *     without modification, are permitted provided that the following
  27 *     conditions are met:
  28 *
  29 *     1. Redistributions of source code must retain the above
  30 *        copyright notice, this list of conditions and the following
  31 *        disclaimer.
  32 *     2. Redistributions in binary form must reproduce the above
  33 *        copyright notice, this list of conditions and the following
  34 *        disclaimer in the documentation and/or other materials
  35 *        provided with the distribution.
  36 *
  37 *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
  38 *     CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
  39 *     INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  40 *     MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  41 *     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  42 *     CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  43 *     SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  44 *     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  45 *     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  46 *     HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  47 *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  48 *     OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
  49 *     EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  50 */
  51#include "libfdt_env.h"
  52
  53#include <fdt.h>
  54#include <libfdt.h>
  55
  56#include "libfdt_internal.h"
  57
  58int fdt_setprop_inplace_namelen_partial(void *fdt, int nodeoffset,
  59                                        const char *name, int namelen,
  60                                        uint32_t idx, const void *val,
  61                                        int len)
  62{
  63        void *propval;
  64        int proplen;
  65
  66        propval = fdt_getprop_namelen_w(fdt, nodeoffset, name, namelen,
  67                                        &proplen);
  68        if (!propval)
  69                return proplen;
  70
  71        if (proplen < (len + idx))
  72                return -FDT_ERR_NOSPACE;
  73
  74        memcpy((char *)propval + idx, val, len);
  75        return 0;
  76}
  77
  78int fdt_setprop_inplace(void *fdt, int nodeoffset, const char *name,
  79                        const void *val, int len)
  80{
  81        const void *propval;
  82        int proplen;
  83
  84        propval = fdt_getprop(fdt, nodeoffset, name, &proplen);
  85        if (!propval)
  86                return proplen;
  87
  88        if (proplen != len)
  89                return -FDT_ERR_NOSPACE;
  90
  91        return fdt_setprop_inplace_namelen_partial(fdt, nodeoffset, name,
  92                                                   strlen(name), 0,
  93                                                   val, len);
  94}
  95
  96static void fdt_nop_region_(void *start, int len)
  97{
  98        fdt32_t *p;
  99
 100        for (p = start; (char *)p < ((char *)start + len); p++)
 101                *p = cpu_to_fdt32(FDT_NOP);
 102}
 103
 104int fdt_nop_property(void *fdt, int nodeoffset, const char *name)
 105{
 106        struct fdt_property *prop;
 107        int len;
 108
 109        prop = fdt_get_property_w(fdt, nodeoffset, name, &len);
 110        if (!prop)
 111                return len;
 112
 113        fdt_nop_region_(prop, len + sizeof(*prop));
 114
 115        return 0;
 116}
 117
 118int fdt_node_end_offset_(void *fdt, int offset)
 119{
 120        int depth = 0;
 121
 122        while ((offset >= 0) && (depth >= 0))
 123                offset = fdt_next_node(fdt, offset, &depth);
 124
 125        return offset;
 126}
 127
 128int fdt_nop_node(void *fdt, int nodeoffset)
 129{
 130        int endoffset;
 131
 132        endoffset = fdt_node_end_offset_(fdt, nodeoffset);
 133        if (endoffset < 0)
 134                return endoffset;
 135
 136        fdt_nop_region_(fdt_offset_ptr_w(fdt, nodeoffset, 0),
 137                        endoffset - nodeoffset);
 138        return 0;
 139}
 140