EmbeddedPkg/Library/FdtLib/fdt_addresses.c

   1 /*
   2  * libfdt - Flat Device Tree manipulation
   3  * Copyright (C) 2014 David Gibson <david@gibson.dropbear.id.au>
   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
  58 int fdt_address_cells(const void *fdt, int nodeoffset)
  59 {
  60         const fdt32_t *ac;
  61         int val;
  62         int len;
  63
  64         ac = fdt_getprop(fdt, nodeoffset, "#address-cells", &len);
  65         if (!ac)
  66                 return 2;
  67
  68         if (len != sizeof(*ac))
  69                 return -FDT_ERR_BADNCELLS;
  70
  71         val = fdt32_to_cpu(*ac);
  72         if ((val <= 0) || (val > FDT_MAX_NCELLS))
  73                 return -FDT_ERR_BADNCELLS;
  74
  75         return val;
  76 }
  77
  78 int fdt_size_cells(const void *fdt, int nodeoffset)
  79 {
  80         const fdt32_t *sc;
  81         int val;
  82         int len;
  83
  84         sc = fdt_getprop(fdt, nodeoffset, "#size-cells", &len);
  85         if (!sc)
  86                 return 2;
  87
  88         if (len != sizeof(*sc))
  89                 return -FDT_ERR_BADNCELLS;
  90
  91         val = fdt32_to_cpu(*sc);
  92         if ((val < 0) || (val > FDT_MAX_NCELLS))
  93                 return -FDT_ERR_BADNCELLS;
  94
  95         return val;
  96 }