1 | /* |
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2 | * libfdt - Flat Device Tree manipulation |
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3 | * Copyright (C) 2014 David Gibson <david@gibson.dropbear.id.au> |
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4 | * Copyright (C) 2018 embedded brains GmbH |
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5 | * |
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6 | * libfdt is dual licensed: you can use it either under the terms of |
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7 | * the GPL, or the BSD license, at your option. |
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8 | * |
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9 | * a) This library is free software; you can redistribute it and/or |
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10 | * modify it under the terms of the GNU General Public License as |
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11 | * published by the Free Software Foundation; either version 2 of the |
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12 | * License, or (at your option) any later version. |
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13 | * |
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14 | * This library is distributed in the hope that it will be useful, |
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15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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17 | * GNU General Public License for more details. |
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18 | * |
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19 | * You should have received a copy of the GNU General Public |
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20 | * License along with this library; if not, write to the Free |
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21 | * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, |
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22 | * MA 02110-1301 USA |
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23 | * |
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24 | * Alternatively, |
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25 | * |
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26 | * b) Redistribution and use in source and binary forms, with or |
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27 | * without modification, are permitted provided that the following |
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28 | * conditions are met: |
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29 | * |
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30 | * 1. Redistributions of source code must retain the above |
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31 | * copyright notice, this list of conditions and the following |
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32 | * disclaimer. |
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33 | * 2. Redistributions in binary form must reproduce the above |
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34 | * copyright notice, this list of conditions and the following |
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35 | * disclaimer in the documentation and/or other materials |
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36 | * provided with the distribution. |
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37 | * |
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38 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND |
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39 | * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, |
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40 | * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
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41 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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42 | * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
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43 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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44 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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45 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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46 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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47 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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48 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
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49 | * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, |
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50 | * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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51 | */ |
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52 | #include "libfdt_env.h" |
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53 | |
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54 | #include <fdt.h> |
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55 | #include <libfdt.h> |
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56 | |
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57 | #include "libfdt_internal.h" |
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58 | |
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59 | static int fdt_cells(const void *fdt, int nodeoffset, const char *name) |
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60 | { |
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61 | const fdt32_t *c; |
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62 | int val; |
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63 | int len; |
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64 | |
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65 | c = fdt_getprop(fdt, nodeoffset, name, &len); |
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66 | if (!c) |
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67 | return 2; |
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68 | |
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69 | if (len != sizeof(*c)) |
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70 | return -FDT_ERR_BADNCELLS; |
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71 | |
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72 | val = fdt32_to_cpu(*c); |
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73 | if ((val <= 0) || (val > FDT_MAX_NCELLS)) |
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74 | return -FDT_ERR_BADNCELLS; |
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75 | |
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76 | return val; |
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77 | } |
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78 | |
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79 | int fdt_address_cells(const void *fdt, int nodeoffset) |
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80 | { |
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81 | return fdt_cells(fdt, nodeoffset, "#address-cells"); |
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82 | } |
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83 | |
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84 | int fdt_size_cells(const void *fdt, int nodeoffset) |
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85 | { |
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86 | return fdt_cells(fdt, nodeoffset, "#size-cells"); |
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87 | } |
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