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@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