Home | History | Annotate | Line # | Download | only in dist
fdt_addresses.c revision 1.1.1.2 
      1 /*	$NetBSD: fdt_addresses.c,v 1.1.1.2 2017/06/08 15:53:11 skrll Exp $	*/
      2 
      3 /*
      4  * libfdt - Flat Device Tree manipulation
      5  * Copyright (C) 2014 David Gibson <david (at) gibson.dropbear.id.au>
      6  *
      7  * libfdt is dual licensed: you can use it either under the terms of
      8  * the GPL, or the BSD license, at your option.
      9  *
     10  *  a) This library is free software; you can redistribute it and/or
     11  *     modify it under the terms of the GNU General Public License as
     12  *     published by the Free Software Foundation; either version 2 of the
     13  *     License, or (at your option) any later version.
     14  *
     15  *     This library is distributed in the hope that it will be useful,
     16  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
     17  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     18  *     GNU General Public License for more details.
     19  *
     20  *     You should have received a copy of the GNU General Public
     21  *     License along with this library; if not, write to the Free
     22  *     Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
     23  *     MA 02110-1301 USA
     24  *
     25  * Alternatively,
     26  *
     27  *  b) Redistribution and use in source and binary forms, with or
     28  *     without modification, are permitted provided that the following
     29  *     conditions are met:
     30  *
     31  *     1. Redistributions of source code must retain the above
     32  *        copyright notice, this list of conditions and the following
     33  *        disclaimer.
     34  *     2. Redistributions in binary form must reproduce the above
     35  *        copyright notice, this list of conditions and the following
     36  *        disclaimer in the documentation and/or other materials
     37  *        provided with the distribution.
     38  *
     39  *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
     40  *     CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
     41  *     INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     42  *     MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     43  *     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
     44  *     CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     45  *     SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     46  *     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     47  *     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     48  *     HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     49  *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     50  *     OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
     51  *     EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     52  */
     53 #include "libfdt_env.h"
     54 
     55 #include <fdt.h>
     56 #include <libfdt.h>
     57 
     58 #include "libfdt_internal.h"
     59 
     60 int fdt_address_cells(const void *fdt, int nodeoffset)
     61 {
     62 	const fdt32_t *ac;
     63 	int val;
     64 	int len;
     65 
     66 	ac = fdt_getprop(fdt, nodeoffset, "#address-cells", &len);
     67 	if (!ac)
     68 		return 2;
     69 
     70 	if (len != sizeof(*ac))
     71 		return -FDT_ERR_BADNCELLS;
     72 
     73 	val = fdt32_to_cpu(*ac);
     74 	if ((val <= 0) || (val > FDT_MAX_NCELLS))
     75 		return -FDT_ERR_BADNCELLS;
     76 
     77 	return val;
     78 }
     79 
     80 int fdt_size_cells(const void *fdt, int nodeoffset)
     81 {
     82 	const fdt32_t *sc;
     83 	int val;
     84 	int len;
     85 
     86 	sc = fdt_getprop(fdt, nodeoffset, "#size-cells", &len);
     87 	if (!sc)
     88 		return 2;
     89 
     90 	if (len != sizeof(*sc))
     91 		return -FDT_ERR_BADNCELLS;
     92 
     93 	val = fdt32_to_cpu(*sc);
     94 	if ((val < 0) || (val > FDT_MAX_NCELLS))
     95 		return -FDT_ERR_BADNCELLS;
     96 
     97 	return val;
     98 }
     99