scripts/dtc/libfdt/fdt_addresses.c

   1 /*
   2  * libfdt - Flat Device Tree manipulation
   3  * Copyright (C) 2014 David Gibson <david@gibson.dropbear.id.au>
   4  * Copyright (C) 2018 embedded brains GmbH
   5  *
   6  * libfdt is dual licensed: you can use it either under the terms of
   7  * the GPL, or the BSD license, at your option.
   8  *
   9  *  a) This library is free software; you can redistribute it and/or
  10  *     modify it under the terms of the GNU General Public License as
  11  *     published by the Free Software Foundation; either version 2 of the
  12  *     License, or (at your option) any later version.
  13  *
  14  *     This library is distributed in the hope that it will be useful,
  15  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *     GNU General Public License for more details.
  18  *
  19  *     You should have received a copy of the GNU General Public
  20  *     License along with this library; if not, write to the Free
  21  *     Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
  22  *     MA 02110-1301 USA
  23  *
  24  * Alternatively,
  25  *
  26  *  b) Redistribution and use in source and binary forms, with or
  27  *     without modification, are permitted provided that the following
  28  *     conditions are met:
  29  *
  30  *     1. Redistributions of source code must retain the above
  31  *        copyright notice, this list of conditions and the following
  32  *        disclaimer.
  33  *     2. Redistributions in binary form must reproduce the above
  34  *        copyright notice, this list of conditions and the following
  35  *        disclaimer in the documentation and/or other materials
  36  *        provided with the distribution.
  37  *
  38  *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
  39  *     CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
  40  *     INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  41  *     MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  42  *     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  43  *     CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  44  *     SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  45  *     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  46  *     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  *     HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  48  *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  49  *     OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
  50  *     EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  51  */
  52 #include "libfdt_env.h"
  53
  54 #include <fdt.h>
  55 #include <libfdt.h>
  56
  57 #include "libfdt_internal.h"
  58
  59 static int fdt_cells(const void *fdt, int nodeoffset, const char *name)
  60 {
  61         const fdt32_t *c;
  62         int val;
  63         int len;
  64
  65         c = fdt_getprop(fdt, nodeoffset, name, &len);
  66         if (!c)
  67                 return 2;
  68
  69         if (len != sizeof(*c))
  70                 return -FDT_ERR_BADNCELLS;
  71
  72         val = fdt32_to_cpu(*c);
  73         if ((val <= 0) || (val > FDT_MAX_NCELLS))
  74                 return -FDT_ERR_BADNCELLS;
  75
  76         return val;
  77 }
  78
  79 int fdt_address_cells(const void *fdt, int nodeoffset)
  80 {
  81         return fdt_cells(fdt, nodeoffset, "#address-cells");
  82 }
  83
  84 int fdt_size_cells(const void *fdt, int nodeoffset)
  85 {
  86         return fdt_cells(fdt, nodeoffset, "#size-cells");
  87 }