| Dan Handley | 32f2130 | 2016-06-02 14:23:40 +0100 | [diff] [blame] | 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 | } |