1328459Skevans/* 2328459Skevans * libfdt - Flat Device Tree manipulation 3328459Skevans * Copyright (C) 2014 David Gibson <david@gibson.dropbear.id.au> 4328459Skevans * 5328459Skevans * libfdt is dual licensed: you can use it either under the terms of 6328459Skevans * the GPL, or the BSD license, at your option. 7328459Skevans * 8328459Skevans * a) This library is free software; you can redistribute it and/or 9328459Skevans * modify it under the terms of the GNU General Public License as 10328459Skevans * published by the Free Software Foundation; either version 2 of the 11328459Skevans * License, or (at your option) any later version. 12328459Skevans * 13328459Skevans * This library is distributed in the hope that it will be useful, 14328459Skevans * but WITHOUT ANY WARRANTY; without even the implied warranty of 15328459Skevans * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16328459Skevans * GNU General Public License for more details. 17328459Skevans * 18328459Skevans * You should have received a copy of the GNU General Public 19328459Skevans * License along with this library; if not, write to the Free 20328459Skevans * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, 21328459Skevans * MA 02110-1301 USA 22328459Skevans * 23328459Skevans * Alternatively, 24328459Skevans * 25328459Skevans * b) Redistribution and use in source and binary forms, with or 26328459Skevans * without modification, are permitted provided that the following 27328459Skevans * conditions are met: 28328459Skevans * 29328459Skevans * 1. Redistributions of source code must retain the above 30328459Skevans * copyright notice, this list of conditions and the following 31328459Skevans * disclaimer. 32328459Skevans * 2. Redistributions in binary form must reproduce the above 33328459Skevans * copyright notice, this list of conditions and the following 34328459Skevans * disclaimer in the documentation and/or other materials 35328459Skevans * provided with the distribution. 36328459Skevans * 37328459Skevans * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 38328459Skevans * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, 39328459Skevans * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 40328459Skevans * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 41328459Skevans * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 42328459Skevans * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 43328459Skevans * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 44328459Skevans * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 45328459Skevans * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 46328459Skevans * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 47328459Skevans * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 48328459Skevans * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 49328459Skevans * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 50328459Skevans */ 51328459Skevans#include "libfdt_env.h" 52328459Skevans 53328459Skevans#include <fdt.h> 54328459Skevans#include <libfdt.h> 55328459Skevans 56328459Skevans#include "libfdt_internal.h" 57328459Skevans 58328459Skevansint fdt_address_cells(const void *fdt, int nodeoffset) 59328459Skevans{ 60328459Skevans const fdt32_t *ac; 61328459Skevans int val; 62328459Skevans int len; 63328459Skevans 64328459Skevans ac = fdt_getprop(fdt, nodeoffset, "#address-cells", &len); 65328459Skevans if (!ac) 66328459Skevans return 2; 67328459Skevans 68328459Skevans if (len != sizeof(*ac)) 69328459Skevans return -FDT_ERR_BADNCELLS; 70328459Skevans 71328459Skevans val = fdt32_to_cpu(*ac); 72328459Skevans if ((val <= 0) || (val > FDT_MAX_NCELLS)) 73328459Skevans return -FDT_ERR_BADNCELLS; 74328459Skevans 75328459Skevans return val; 76328459Skevans} 77328459Skevans 78328459Skevansint fdt_size_cells(const void *fdt, int nodeoffset) 79328459Skevans{ 80328459Skevans const fdt32_t *sc; 81328459Skevans int val; 82328459Skevans int len; 83328459Skevans 84328459Skevans sc = fdt_getprop(fdt, nodeoffset, "#size-cells", &len); 85328459Skevans if (!sc) 86328459Skevans return 2; 87328459Skevans 88328459Skevans if (len != sizeof(*sc)) 89328459Skevans return -FDT_ERR_BADNCELLS; 90328459Skevans 91328459Skevans val = fdt32_to_cpu(*sc); 92328459Skevans if ((val < 0) || (val > FDT_MAX_NCELLS)) 93328459Skevans return -FDT_ERR_BADNCELLS; 94328459Skevans 95328459Skevans return val; 96328459Skevans} 97