[175263e] | 1 | #ifndef _LIBFDT_H |
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| 2 | #define _LIBFDT_H |
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| 3 | /* |
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| 4 | * libfdt - Flat Device Tree manipulation |
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| 5 | * Copyright (C) 2006 David Gibson, IBM Corporation. |
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| 6 | * |
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| 7 | * libfdt is dual licensed: you can use it either under the terms of |
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| 8 | * the GPL, or the BSD license, at your option. |
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| 9 | * |
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| 10 | * a) This library is free software; you can redistribute it and/or |
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| 11 | * modify it under the terms of the GNU General Public License as |
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| 12 | * published by the Free Software Foundation; either version 2 of the |
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| 13 | * License, or (at your option) any later version. |
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| 14 | * |
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| 15 | * This library is distributed in the hope that it will be useful, |
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| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 18 | * GNU General Public License for more details. |
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| 19 | * |
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| 20 | * You should have received a copy of the GNU General Public |
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| 21 | * License along with this library; if not, write to the Free |
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| 22 | * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, |
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| 23 | * MA 02110-1301 USA |
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| 24 | * |
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| 25 | * Alternatively, |
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| 26 | * |
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| 27 | * b) Redistribution and use in source and binary forms, with or |
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| 28 | * without modification, are permitted provided that the following |
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| 29 | * conditions are met: |
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| 30 | * |
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| 31 | * 1. Redistributions of source code must retain the above |
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| 32 | * copyright notice, this list of conditions and the following |
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| 33 | * disclaimer. |
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| 34 | * 2. Redistributions in binary form must reproduce the above |
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| 35 | * copyright notice, this list of conditions and the following |
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| 36 | * disclaimer in the documentation and/or other materials |
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| 37 | * provided with the distribution. |
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| 38 | * |
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| 39 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND |
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| 40 | * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, |
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| 41 | * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
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| 42 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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| 43 | * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
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| 44 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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| 45 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 46 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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| 47 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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| 48 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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| 49 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
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| 50 | * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, |
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| 51 | * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 52 | */ |
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| 53 | |
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| 54 | #include <libfdt_env.h> |
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| 55 | #include <fdt.h> |
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| 56 | |
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| 57 | #define FDT_FIRST_SUPPORTED_VERSION 0x10 |
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| 58 | #define FDT_LAST_SUPPORTED_VERSION 0x11 |
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| 59 | |
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| 60 | /* Error codes: informative error codes */ |
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| 61 | #define FDT_ERR_NOTFOUND 1 |
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| 62 | /* FDT_ERR_NOTFOUND: The requested node or property does not exist */ |
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| 63 | #define FDT_ERR_EXISTS 2 |
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| 64 | /* FDT_ERR_EXISTS: Attemped to create a node or property which |
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| 65 | * already exists */ |
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| 66 | #define FDT_ERR_NOSPACE 3 |
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| 67 | /* FDT_ERR_NOSPACE: Operation needed to expand the device |
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| 68 | * tree, but its buffer did not have sufficient space to |
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| 69 | * contain the expanded tree. Use fdt_open_into() to move the |
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| 70 | * device tree to a buffer with more space. */ |
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| 71 | |
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| 72 | /* Error codes: codes for bad parameters */ |
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| 73 | #define FDT_ERR_BADOFFSET 4 |
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| 74 | /* FDT_ERR_BADOFFSET: Function was passed a structure block |
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| 75 | * offset which is out-of-bounds, or which points to an |
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| 76 | * unsuitable part of the structure for the operation. */ |
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| 77 | #define FDT_ERR_BADPATH 5 |
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| 78 | /* FDT_ERR_BADPATH: Function was passed a badly formatted path |
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| 79 | * (e.g. missing a leading / for a function which requires an |
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| 80 | * absolute path) */ |
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| 81 | #define FDT_ERR_BADPHANDLE 6 |
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| 82 | /* FDT_ERR_BADPHANDLE: Function was passed an invalid phandle |
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| 83 | * value. phandle values of 0 and -1 are not permitted. */ |
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| 84 | #define FDT_ERR_BADSTATE 7 |
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| 85 | /* FDT_ERR_BADSTATE: Function was passed an incomplete device |
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| 86 | * tree created by the sequential-write functions, which is |
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| 87 | * not sufficiently complete for the requested operation. */ |
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| 88 | |
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| 89 | /* Error codes: codes for bad device tree blobs */ |
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| 90 | #define FDT_ERR_TRUNCATED 8 |
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| 91 | /* FDT_ERR_TRUNCATED: Structure block of the given device tree |
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| 92 | * ends without an FDT_END tag. */ |
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| 93 | #define FDT_ERR_BADMAGIC 9 |
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| 94 | /* FDT_ERR_BADMAGIC: Given "device tree" appears not to be a |
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| 95 | * device tree at all - it is missing the flattened device |
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| 96 | * tree magic number. */ |
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| 97 | #define FDT_ERR_BADVERSION 10 |
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| 98 | /* FDT_ERR_BADVERSION: Given device tree has a version which |
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| 99 | * can't be handled by the requested operation. For |
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| 100 | * read-write functions, this may mean that fdt_open_into() is |
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| 101 | * required to convert the tree to the expected version. */ |
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| 102 | #define FDT_ERR_BADSTRUCTURE 11 |
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| 103 | /* FDT_ERR_BADSTRUCTURE: Given device tree has a corrupt |
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| 104 | * structure block or other serious error (e.g. misnested |
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| 105 | * nodes, or subnodes preceding properties). */ |
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| 106 | #define FDT_ERR_BADLAYOUT 12 |
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| 107 | /* FDT_ERR_BADLAYOUT: For read-write functions, the given |
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| 108 | * device tree has it's sub-blocks in an order that the |
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| 109 | * function can't handle (memory reserve map, then structure, |
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| 110 | * then strings). Use fdt_open_into() to reorganize the tree |
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| 111 | * into a form suitable for the read-write operations. */ |
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| 112 | |
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| 113 | /* "Can't happen" error indicating a bug in libfdt */ |
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| 114 | #define FDT_ERR_INTERNAL 13 |
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| 115 | /* FDT_ERR_INTERNAL: libfdt has failed an internal assertion. |
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| 116 | * Should never be returned, if it is, it indicates a bug in |
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| 117 | * libfdt itself. */ |
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| 118 | |
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| 119 | /* Errors in device tree content */ |
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| 120 | #define FDT_ERR_BADNCELLS 14 |
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| 121 | /* FDT_ERR_BADNCELLS: Device tree has a #address-cells, #size-cells |
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| 122 | * or similar property with a bad format or value */ |
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| 123 | |
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| 124 | #define FDT_ERR_BADVALUE 15 |
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| 125 | /* FDT_ERR_BADVALUE: Device tree has a property with an unexpected |
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| 126 | * value. For example: a property expected to contain a string list |
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| 127 | * is not NUL-terminated within the length of its value. */ |
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| 128 | |
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| 129 | #define FDT_ERR_MAX 15 |
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| 130 | |
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| 131 | /**********************************************************************/ |
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| 132 | /* Low-level functions (you probably don't need these) */ |
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| 133 | /**********************************************************************/ |
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| 134 | |
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| 135 | const void *fdt_offset_ptr(const void *fdt, int offset, unsigned int checklen); |
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| 136 | static inline void *fdt_offset_ptr_w(void *fdt, int offset, int checklen) |
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| 137 | { |
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| 138 | return (void *)(uintptr_t)fdt_offset_ptr(fdt, offset, checklen); |
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| 139 | } |
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| 140 | |
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| 141 | uint32_t fdt_next_tag(const void *fdt, int offset, int *nextoffset); |
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| 142 | |
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| 143 | /**********************************************************************/ |
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| 144 | /* Traversal functions */ |
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| 145 | /**********************************************************************/ |
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| 146 | |
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| 147 | int fdt_next_node(const void *fdt, int offset, int *depth); |
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| 148 | |
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| 149 | /** |
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| 150 | * fdt_first_subnode() - get offset of first direct subnode |
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| 151 | * |
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| 152 | * @fdt: FDT blob |
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| 153 | * @offset: Offset of node to check |
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| 154 | * @return offset of first subnode, or -FDT_ERR_NOTFOUND if there is none |
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| 155 | */ |
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| 156 | int fdt_first_subnode(const void *fdt, int offset); |
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| 157 | |
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| 158 | /** |
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| 159 | * fdt_next_subnode() - get offset of next direct subnode |
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| 160 | * |
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| 161 | * After first calling fdt_first_subnode(), call this function repeatedly to |
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| 162 | * get direct subnodes of a parent node. |
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| 163 | * |
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| 164 | * @fdt: FDT blob |
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| 165 | * @offset: Offset of previous subnode |
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| 166 | * @return offset of next subnode, or -FDT_ERR_NOTFOUND if there are no more |
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| 167 | * subnodes |
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| 168 | */ |
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| 169 | int fdt_next_subnode(const void *fdt, int offset); |
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| 170 | |
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| 171 | /**********************************************************************/ |
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| 172 | /* General functions */ |
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| 173 | /**********************************************************************/ |
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| 174 | |
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| 175 | #define fdt_get_header(fdt, field) \ |
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| 176 | (fdt32_to_cpu(((const struct fdt_header *)(fdt))->field)) |
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[34e6ae62] | 177 | #define fdt_magic(fdt) (fdt_get_header(fdt, magic)) |
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[175263e] | 178 | #define fdt_totalsize(fdt) (fdt_get_header(fdt, totalsize)) |
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| 179 | #define fdt_off_dt_struct(fdt) (fdt_get_header(fdt, off_dt_struct)) |
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| 180 | #define fdt_off_dt_strings(fdt) (fdt_get_header(fdt, off_dt_strings)) |
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| 181 | #define fdt_off_mem_rsvmap(fdt) (fdt_get_header(fdt, off_mem_rsvmap)) |
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| 182 | #define fdt_version(fdt) (fdt_get_header(fdt, version)) |
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[34e6ae62] | 183 | #define fdt_last_comp_version(fdt) (fdt_get_header(fdt, last_comp_version)) |
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| 184 | #define fdt_boot_cpuid_phys(fdt) (fdt_get_header(fdt, boot_cpuid_phys)) |
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| 185 | #define fdt_size_dt_strings(fdt) (fdt_get_header(fdt, size_dt_strings)) |
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[175263e] | 186 | #define fdt_size_dt_struct(fdt) (fdt_get_header(fdt, size_dt_struct)) |
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| 187 | |
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| 188 | #define __fdt_set_hdr(name) \ |
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| 189 | static inline void fdt_set_##name(void *fdt, uint32_t val) \ |
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| 190 | { \ |
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| 191 | struct fdt_header *fdth = (struct fdt_header*)fdt; \ |
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| 192 | fdth->name = cpu_to_fdt32(val); \ |
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| 193 | } |
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| 194 | __fdt_set_hdr(magic); |
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| 195 | __fdt_set_hdr(totalsize); |
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| 196 | __fdt_set_hdr(off_dt_struct); |
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| 197 | __fdt_set_hdr(off_dt_strings); |
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| 198 | __fdt_set_hdr(off_mem_rsvmap); |
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| 199 | __fdt_set_hdr(version); |
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| 200 | __fdt_set_hdr(last_comp_version); |
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| 201 | __fdt_set_hdr(boot_cpuid_phys); |
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| 202 | __fdt_set_hdr(size_dt_strings); |
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| 203 | __fdt_set_hdr(size_dt_struct); |
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| 204 | #undef __fdt_set_hdr |
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| 205 | |
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| 206 | /** |
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| 207 | * fdt_check_header - sanity check a device tree or possible device tree |
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| 208 | * @fdt: pointer to data which might be a flattened device tree |
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| 209 | * |
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| 210 | * fdt_check_header() checks that the given buffer contains what |
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| 211 | * appears to be a flattened device tree with sane information in its |
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| 212 | * header. |
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| 213 | * |
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| 214 | * returns: |
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| 215 | * 0, if the buffer appears to contain a valid device tree |
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| 216 | * -FDT_ERR_BADMAGIC, |
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| 217 | * -FDT_ERR_BADVERSION, |
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| 218 | * -FDT_ERR_BADSTATE, standard meanings, as above |
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| 219 | */ |
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| 220 | int fdt_check_header(const void *fdt); |
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| 221 | |
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| 222 | /** |
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| 223 | * fdt_move - move a device tree around in memory |
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| 224 | * @fdt: pointer to the device tree to move |
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| 225 | * @buf: pointer to memory where the device is to be moved |
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| 226 | * @bufsize: size of the memory space at buf |
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| 227 | * |
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| 228 | * fdt_move() relocates, if possible, the device tree blob located at |
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| 229 | * fdt to the buffer at buf of size bufsize. The buffer may overlap |
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| 230 | * with the existing device tree blob at fdt. Therefore, |
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| 231 | * fdt_move(fdt, fdt, fdt_totalsize(fdt)) |
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| 232 | * should always succeed. |
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| 233 | * |
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| 234 | * returns: |
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| 235 | * 0, on success |
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| 236 | * -FDT_ERR_NOSPACE, bufsize is insufficient to contain the device tree |
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| 237 | * -FDT_ERR_BADMAGIC, |
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| 238 | * -FDT_ERR_BADVERSION, |
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| 239 | * -FDT_ERR_BADSTATE, standard meanings |
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| 240 | */ |
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| 241 | int fdt_move(const void *fdt, void *buf, int bufsize); |
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| 242 | |
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| 243 | /**********************************************************************/ |
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| 244 | /* Read-only functions */ |
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| 245 | /**********************************************************************/ |
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| 246 | |
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| 247 | /** |
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| 248 | * fdt_string - retrieve a string from the strings block of a device tree |
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| 249 | * @fdt: pointer to the device tree blob |
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| 250 | * @stroffset: offset of the string within the strings block (native endian) |
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| 251 | * |
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| 252 | * fdt_string() retrieves a pointer to a single string from the |
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| 253 | * strings block of the device tree blob at fdt. |
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| 254 | * |
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| 255 | * returns: |
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| 256 | * a pointer to the string, on success |
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| 257 | * NULL, if stroffset is out of bounds |
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| 258 | */ |
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| 259 | const char *fdt_string(const void *fdt, int stroffset); |
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| 260 | |
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| 261 | /** |
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| 262 | * fdt_num_mem_rsv - retrieve the number of memory reserve map entries |
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| 263 | * @fdt: pointer to the device tree blob |
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| 264 | * |
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| 265 | * Returns the number of entries in the device tree blob's memory |
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| 266 | * reservation map. This does not include the terminating 0,0 entry |
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| 267 | * or any other (0,0) entries reserved for expansion. |
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| 268 | * |
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| 269 | * returns: |
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| 270 | * the number of entries |
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| 271 | */ |
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| 272 | int fdt_num_mem_rsv(const void *fdt); |
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| 273 | |
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| 274 | /** |
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| 275 | * fdt_get_mem_rsv - retrieve one memory reserve map entry |
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| 276 | * @fdt: pointer to the device tree blob |
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| 277 | * @address, @size: pointers to 64-bit variables |
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| 278 | * |
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| 279 | * On success, *address and *size will contain the address and size of |
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| 280 | * the n-th reserve map entry from the device tree blob, in |
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| 281 | * native-endian format. |
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| 282 | * |
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| 283 | * returns: |
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| 284 | * 0, on success |
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| 285 | * -FDT_ERR_BADMAGIC, |
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| 286 | * -FDT_ERR_BADVERSION, |
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| 287 | * -FDT_ERR_BADSTATE, standard meanings |
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| 288 | */ |
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| 289 | int fdt_get_mem_rsv(const void *fdt, int n, uint64_t *address, uint64_t *size); |
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| 290 | |
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| 291 | /** |
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| 292 | * fdt_subnode_offset_namelen - find a subnode based on substring |
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| 293 | * @fdt: pointer to the device tree blob |
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| 294 | * @parentoffset: structure block offset of a node |
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| 295 | * @name: name of the subnode to locate |
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| 296 | * @namelen: number of characters of name to consider |
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| 297 | * |
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| 298 | * Identical to fdt_subnode_offset(), but only examine the first |
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| 299 | * namelen characters of name for matching the subnode name. This is |
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| 300 | * useful for finding subnodes based on a portion of a larger string, |
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| 301 | * such as a full path. |
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| 302 | */ |
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| 303 | int fdt_subnode_offset_namelen(const void *fdt, int parentoffset, |
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| 304 | const char *name, int namelen); |
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| 305 | /** |
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| 306 | * fdt_subnode_offset - find a subnode of a given node |
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| 307 | * @fdt: pointer to the device tree blob |
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| 308 | * @parentoffset: structure block offset of a node |
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| 309 | * @name: name of the subnode to locate |
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| 310 | * |
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| 311 | * fdt_subnode_offset() finds a subnode of the node at structure block |
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| 312 | * offset parentoffset with the given name. name may include a unit |
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| 313 | * address, in which case fdt_subnode_offset() will find the subnode |
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| 314 | * with that unit address, or the unit address may be omitted, in |
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| 315 | * which case fdt_subnode_offset() will find an arbitrary subnode |
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| 316 | * whose name excluding unit address matches the given name. |
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| 317 | * |
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| 318 | * returns: |
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| 319 | * structure block offset of the requested subnode (>=0), on success |
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| 320 | * -FDT_ERR_NOTFOUND, if the requested subnode does not exist |
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| 321 | * -FDT_ERR_BADOFFSET, if parentoffset did not point to an FDT_BEGIN_NODE tag |
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| 322 | * -FDT_ERR_BADMAGIC, |
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| 323 | * -FDT_ERR_BADVERSION, |
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| 324 | * -FDT_ERR_BADSTATE, |
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| 325 | * -FDT_ERR_BADSTRUCTURE, |
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| 326 | * -FDT_ERR_TRUNCATED, standard meanings. |
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| 327 | */ |
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| 328 | int fdt_subnode_offset(const void *fdt, int parentoffset, const char *name); |
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| 329 | |
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| 330 | /** |
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| 331 | * fdt_path_offset_namelen - find a tree node by its full path |
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| 332 | * @fdt: pointer to the device tree blob |
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| 333 | * @path: full path of the node to locate |
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| 334 | * @namelen: number of characters of path to consider |
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| 335 | * |
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| 336 | * Identical to fdt_path_offset(), but only consider the first namelen |
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| 337 | * characters of path as the path name. |
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| 338 | */ |
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| 339 | int fdt_path_offset_namelen(const void *fdt, const char *path, int namelen); |
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| 340 | |
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| 341 | /** |
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| 342 | * fdt_path_offset - find a tree node by its full path |
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| 343 | * @fdt: pointer to the device tree blob |
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| 344 | * @path: full path of the node to locate |
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| 345 | * |
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| 346 | * fdt_path_offset() finds a node of a given path in the device tree. |
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| 347 | * Each path component may omit the unit address portion, but the |
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| 348 | * results of this are undefined if any such path component is |
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| 349 | * ambiguous (that is if there are multiple nodes at the relevant |
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| 350 | * level matching the given component, differentiated only by unit |
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| 351 | * address). |
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| 352 | * |
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| 353 | * returns: |
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| 354 | * structure block offset of the node with the requested path (>=0), on success |
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| 355 | * -FDT_ERR_BADPATH, given path does not begin with '/' or is invalid |
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| 356 | * -FDT_ERR_NOTFOUND, if the requested node does not exist |
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| 357 | * -FDT_ERR_BADMAGIC, |
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| 358 | * -FDT_ERR_BADVERSION, |
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| 359 | * -FDT_ERR_BADSTATE, |
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| 360 | * -FDT_ERR_BADSTRUCTURE, |
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| 361 | * -FDT_ERR_TRUNCATED, standard meanings. |
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| 362 | */ |
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| 363 | int fdt_path_offset(const void *fdt, const char *path); |
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| 364 | |
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| 365 | /** |
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| 366 | * fdt_get_name - retrieve the name of a given node |
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| 367 | * @fdt: pointer to the device tree blob |
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| 368 | * @nodeoffset: structure block offset of the starting node |
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| 369 | * @lenp: pointer to an integer variable (will be overwritten) or NULL |
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| 370 | * |
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| 371 | * fdt_get_name() retrieves the name (including unit address) of the |
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| 372 | * device tree node at structure block offset nodeoffset. If lenp is |
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| 373 | * non-NULL, the length of this name is also returned, in the integer |
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| 374 | * pointed to by lenp. |
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| 375 | * |
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| 376 | * returns: |
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| 377 | * pointer to the node's name, on success |
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| 378 | * If lenp is non-NULL, *lenp contains the length of that name (>=0) |
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| 379 | * NULL, on error |
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| 380 | * if lenp is non-NULL *lenp contains an error code (<0): |
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| 381 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag |
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| 382 | * -FDT_ERR_BADMAGIC, |
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| 383 | * -FDT_ERR_BADVERSION, |
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| 384 | * -FDT_ERR_BADSTATE, standard meanings |
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| 385 | */ |
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| 386 | const char *fdt_get_name(const void *fdt, int nodeoffset, int *lenp); |
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| 387 | |
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| 388 | /** |
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| 389 | * fdt_first_property_offset - find the offset of a node's first property |
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| 390 | * @fdt: pointer to the device tree blob |
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| 391 | * @nodeoffset: structure block offset of a node |
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| 392 | * |
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| 393 | * fdt_first_property_offset() finds the first property of the node at |
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| 394 | * the given structure block offset. |
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| 395 | * |
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| 396 | * returns: |
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| 397 | * structure block offset of the property (>=0), on success |
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| 398 | * -FDT_ERR_NOTFOUND, if the requested node has no properties |
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| 399 | * -FDT_ERR_BADOFFSET, if nodeoffset did not point to an FDT_BEGIN_NODE tag |
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| 400 | * -FDT_ERR_BADMAGIC, |
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| 401 | * -FDT_ERR_BADVERSION, |
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| 402 | * -FDT_ERR_BADSTATE, |
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| 403 | * -FDT_ERR_BADSTRUCTURE, |
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| 404 | * -FDT_ERR_TRUNCATED, standard meanings. |
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| 405 | */ |
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| 406 | int fdt_first_property_offset(const void *fdt, int nodeoffset); |
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| 407 | |
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| 408 | /** |
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| 409 | * fdt_next_property_offset - step through a node's properties |
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| 410 | * @fdt: pointer to the device tree blob |
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| 411 | * @offset: structure block offset of a property |
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| 412 | * |
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| 413 | * fdt_next_property_offset() finds the property immediately after the |
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| 414 | * one at the given structure block offset. This will be a property |
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| 415 | * of the same node as the given property. |
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| 416 | * |
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| 417 | * returns: |
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| 418 | * structure block offset of the next property (>=0), on success |
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| 419 | * -FDT_ERR_NOTFOUND, if the given property is the last in its node |
---|
| 420 | * -FDT_ERR_BADOFFSET, if nodeoffset did not point to an FDT_PROP tag |
---|
| 421 | * -FDT_ERR_BADMAGIC, |
---|
| 422 | * -FDT_ERR_BADVERSION, |
---|
| 423 | * -FDT_ERR_BADSTATE, |
---|
| 424 | * -FDT_ERR_BADSTRUCTURE, |
---|
| 425 | * -FDT_ERR_TRUNCATED, standard meanings. |
---|
| 426 | */ |
---|
| 427 | int fdt_next_property_offset(const void *fdt, int offset); |
---|
| 428 | |
---|
| 429 | /** |
---|
| 430 | * fdt_get_property_by_offset - retrieve the property at a given offset |
---|
| 431 | * @fdt: pointer to the device tree blob |
---|
| 432 | * @offset: offset of the property to retrieve |
---|
| 433 | * @lenp: pointer to an integer variable (will be overwritten) or NULL |
---|
| 434 | * |
---|
| 435 | * fdt_get_property_by_offset() retrieves a pointer to the |
---|
| 436 | * fdt_property structure within the device tree blob at the given |
---|
| 437 | * offset. If lenp is non-NULL, the length of the property value is |
---|
| 438 | * also returned, in the integer pointed to by lenp. |
---|
| 439 | * |
---|
| 440 | * returns: |
---|
| 441 | * pointer to the structure representing the property |
---|
| 442 | * if lenp is non-NULL, *lenp contains the length of the property |
---|
| 443 | * value (>=0) |
---|
| 444 | * NULL, on error |
---|
| 445 | * if lenp is non-NULL, *lenp contains an error code (<0): |
---|
| 446 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_PROP tag |
---|
| 447 | * -FDT_ERR_BADMAGIC, |
---|
| 448 | * -FDT_ERR_BADVERSION, |
---|
| 449 | * -FDT_ERR_BADSTATE, |
---|
| 450 | * -FDT_ERR_BADSTRUCTURE, |
---|
| 451 | * -FDT_ERR_TRUNCATED, standard meanings |
---|
| 452 | */ |
---|
| 453 | const struct fdt_property *fdt_get_property_by_offset(const void *fdt, |
---|
| 454 | int offset, |
---|
| 455 | int *lenp); |
---|
| 456 | |
---|
| 457 | /** |
---|
| 458 | * fdt_get_property_namelen - find a property based on substring |
---|
| 459 | * @fdt: pointer to the device tree blob |
---|
| 460 | * @nodeoffset: offset of the node whose property to find |
---|
| 461 | * @name: name of the property to find |
---|
| 462 | * @namelen: number of characters of name to consider |
---|
| 463 | * @lenp: pointer to an integer variable (will be overwritten) or NULL |
---|
| 464 | * |
---|
| 465 | * Identical to fdt_get_property(), but only examine the first namelen |
---|
| 466 | * characters of name for matching the property name. |
---|
| 467 | */ |
---|
| 468 | const struct fdt_property *fdt_get_property_namelen(const void *fdt, |
---|
| 469 | int nodeoffset, |
---|
| 470 | const char *name, |
---|
| 471 | int namelen, int *lenp); |
---|
| 472 | |
---|
| 473 | /** |
---|
| 474 | * fdt_get_property - find a given property in a given node |
---|
| 475 | * @fdt: pointer to the device tree blob |
---|
| 476 | * @nodeoffset: offset of the node whose property to find |
---|
| 477 | * @name: name of the property to find |
---|
| 478 | * @lenp: pointer to an integer variable (will be overwritten) or NULL |
---|
| 479 | * |
---|
| 480 | * fdt_get_property() retrieves a pointer to the fdt_property |
---|
| 481 | * structure within the device tree blob corresponding to the property |
---|
| 482 | * named 'name' of the node at offset nodeoffset. If lenp is |
---|
| 483 | * non-NULL, the length of the property value is also returned, in the |
---|
| 484 | * integer pointed to by lenp. |
---|
| 485 | * |
---|
| 486 | * returns: |
---|
| 487 | * pointer to the structure representing the property |
---|
| 488 | * if lenp is non-NULL, *lenp contains the length of the property |
---|
| 489 | * value (>=0) |
---|
| 490 | * NULL, on error |
---|
| 491 | * if lenp is non-NULL, *lenp contains an error code (<0): |
---|
| 492 | * -FDT_ERR_NOTFOUND, node does not have named property |
---|
| 493 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag |
---|
| 494 | * -FDT_ERR_BADMAGIC, |
---|
| 495 | * -FDT_ERR_BADVERSION, |
---|
| 496 | * -FDT_ERR_BADSTATE, |
---|
| 497 | * -FDT_ERR_BADSTRUCTURE, |
---|
| 498 | * -FDT_ERR_TRUNCATED, standard meanings |
---|
| 499 | */ |
---|
| 500 | const struct fdt_property *fdt_get_property(const void *fdt, int nodeoffset, |
---|
| 501 | const char *name, int *lenp); |
---|
| 502 | static inline struct fdt_property *fdt_get_property_w(void *fdt, int nodeoffset, |
---|
| 503 | const char *name, |
---|
| 504 | int *lenp) |
---|
| 505 | { |
---|
| 506 | return (struct fdt_property *)(uintptr_t) |
---|
| 507 | fdt_get_property(fdt, nodeoffset, name, lenp); |
---|
| 508 | } |
---|
| 509 | |
---|
| 510 | /** |
---|
| 511 | * fdt_getprop_by_offset - retrieve the value of a property at a given offset |
---|
| 512 | * @fdt: pointer to the device tree blob |
---|
| 513 | * @ffset: offset of the property to read |
---|
| 514 | * @namep: pointer to a string variable (will be overwritten) or NULL |
---|
| 515 | * @lenp: pointer to an integer variable (will be overwritten) or NULL |
---|
| 516 | * |
---|
| 517 | * fdt_getprop_by_offset() retrieves a pointer to the value of the |
---|
| 518 | * property at structure block offset 'offset' (this will be a pointer |
---|
| 519 | * to within the device blob itself, not a copy of the value). If |
---|
| 520 | * lenp is non-NULL, the length of the property value is also |
---|
| 521 | * returned, in the integer pointed to by lenp. If namep is non-NULL, |
---|
| 522 | * the property's namne will also be returned in the char * pointed to |
---|
| 523 | * by namep (this will be a pointer to within the device tree's string |
---|
| 524 | * block, not a new copy of the name). |
---|
| 525 | * |
---|
| 526 | * returns: |
---|
| 527 | * pointer to the property's value |
---|
| 528 | * if lenp is non-NULL, *lenp contains the length of the property |
---|
| 529 | * value (>=0) |
---|
| 530 | * if namep is non-NULL *namep contiains a pointer to the property |
---|
| 531 | * name. |
---|
| 532 | * NULL, on error |
---|
| 533 | * if lenp is non-NULL, *lenp contains an error code (<0): |
---|
| 534 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_PROP tag |
---|
| 535 | * -FDT_ERR_BADMAGIC, |
---|
| 536 | * -FDT_ERR_BADVERSION, |
---|
| 537 | * -FDT_ERR_BADSTATE, |
---|
| 538 | * -FDT_ERR_BADSTRUCTURE, |
---|
| 539 | * -FDT_ERR_TRUNCATED, standard meanings |
---|
| 540 | */ |
---|
| 541 | const void *fdt_getprop_by_offset(const void *fdt, int offset, |
---|
| 542 | const char **namep, int *lenp); |
---|
| 543 | |
---|
| 544 | /** |
---|
| 545 | * fdt_getprop_namelen - get property value based on substring |
---|
| 546 | * @fdt: pointer to the device tree blob |
---|
| 547 | * @nodeoffset: offset of the node whose property to find |
---|
| 548 | * @name: name of the property to find |
---|
| 549 | * @namelen: number of characters of name to consider |
---|
| 550 | * @lenp: pointer to an integer variable (will be overwritten) or NULL |
---|
| 551 | * |
---|
| 552 | * Identical to fdt_getprop(), but only examine the first namelen |
---|
| 553 | * characters of name for matching the property name. |
---|
| 554 | */ |
---|
| 555 | const void *fdt_getprop_namelen(const void *fdt, int nodeoffset, |
---|
| 556 | const char *name, int namelen, int *lenp); |
---|
| 557 | |
---|
| 558 | /** |
---|
| 559 | * fdt_getprop - retrieve the value of a given property |
---|
| 560 | * @fdt: pointer to the device tree blob |
---|
| 561 | * @nodeoffset: offset of the node whose property to find |
---|
| 562 | * @name: name of the property to find |
---|
| 563 | * @lenp: pointer to an integer variable (will be overwritten) or NULL |
---|
| 564 | * |
---|
| 565 | * fdt_getprop() retrieves a pointer to the value of the property |
---|
| 566 | * named 'name' of the node at offset nodeoffset (this will be a |
---|
| 567 | * pointer to within the device blob itself, not a copy of the value). |
---|
| 568 | * If lenp is non-NULL, the length of the property value is also |
---|
| 569 | * returned, in the integer pointed to by lenp. |
---|
| 570 | * |
---|
| 571 | * returns: |
---|
| 572 | * pointer to the property's value |
---|
| 573 | * if lenp is non-NULL, *lenp contains the length of the property |
---|
| 574 | * value (>=0) |
---|
| 575 | * NULL, on error |
---|
| 576 | * if lenp is non-NULL, *lenp contains an error code (<0): |
---|
| 577 | * -FDT_ERR_NOTFOUND, node does not have named property |
---|
| 578 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag |
---|
| 579 | * -FDT_ERR_BADMAGIC, |
---|
| 580 | * -FDT_ERR_BADVERSION, |
---|
| 581 | * -FDT_ERR_BADSTATE, |
---|
| 582 | * -FDT_ERR_BADSTRUCTURE, |
---|
| 583 | * -FDT_ERR_TRUNCATED, standard meanings |
---|
| 584 | */ |
---|
| 585 | const void *fdt_getprop(const void *fdt, int nodeoffset, |
---|
| 586 | const char *name, int *lenp); |
---|
| 587 | static inline void *fdt_getprop_w(void *fdt, int nodeoffset, |
---|
| 588 | const char *name, int *lenp) |
---|
| 589 | { |
---|
| 590 | return (void *)(uintptr_t)fdt_getprop(fdt, nodeoffset, name, lenp); |
---|
| 591 | } |
---|
| 592 | |
---|
| 593 | /** |
---|
| 594 | * fdt_get_phandle - retrieve the phandle of a given node |
---|
| 595 | * @fdt: pointer to the device tree blob |
---|
| 596 | * @nodeoffset: structure block offset of the node |
---|
| 597 | * |
---|
| 598 | * fdt_get_phandle() retrieves the phandle of the device tree node at |
---|
| 599 | * structure block offset nodeoffset. |
---|
| 600 | * |
---|
| 601 | * returns: |
---|
| 602 | * the phandle of the node at nodeoffset, on success (!= 0, != -1) |
---|
| 603 | * 0, if the node has no phandle, or another error occurs |
---|
| 604 | */ |
---|
| 605 | uint32_t fdt_get_phandle(const void *fdt, int nodeoffset); |
---|
| 606 | |
---|
| 607 | /** |
---|
| 608 | * fdt_get_alias_namelen - get alias based on substring |
---|
| 609 | * @fdt: pointer to the device tree blob |
---|
| 610 | * @name: name of the alias th look up |
---|
| 611 | * @namelen: number of characters of name to consider |
---|
| 612 | * |
---|
| 613 | * Identical to fdt_get_alias(), but only examine the first namelen |
---|
| 614 | * characters of name for matching the alias name. |
---|
| 615 | */ |
---|
| 616 | const char *fdt_get_alias_namelen(const void *fdt, |
---|
| 617 | const char *name, int namelen); |
---|
| 618 | |
---|
| 619 | /** |
---|
| 620 | * fdt_get_alias - retreive the path referenced by a given alias |
---|
| 621 | * @fdt: pointer to the device tree blob |
---|
| 622 | * @name: name of the alias th look up |
---|
| 623 | * |
---|
| 624 | * fdt_get_alias() retrieves the value of a given alias. That is, the |
---|
| 625 | * value of the property named 'name' in the node /aliases. |
---|
| 626 | * |
---|
| 627 | * returns: |
---|
| 628 | * a pointer to the expansion of the alias named 'name', if it exists |
---|
| 629 | * NULL, if the given alias or the /aliases node does not exist |
---|
| 630 | */ |
---|
| 631 | const char *fdt_get_alias(const void *fdt, const char *name); |
---|
| 632 | |
---|
| 633 | /** |
---|
| 634 | * fdt_get_path - determine the full path of a node |
---|
| 635 | * @fdt: pointer to the device tree blob |
---|
| 636 | * @nodeoffset: offset of the node whose path to find |
---|
| 637 | * @buf: character buffer to contain the returned path (will be overwritten) |
---|
| 638 | * @buflen: size of the character buffer at buf |
---|
| 639 | * |
---|
| 640 | * fdt_get_path() computes the full path of the node at offset |
---|
| 641 | * nodeoffset, and records that path in the buffer at buf. |
---|
| 642 | * |
---|
| 643 | * NOTE: This function is expensive, as it must scan the device tree |
---|
| 644 | * structure from the start to nodeoffset. |
---|
| 645 | * |
---|
| 646 | * returns: |
---|
| 647 | * 0, on success |
---|
| 648 | * buf contains the absolute path of the node at |
---|
| 649 | * nodeoffset, as a NUL-terminated string. |
---|
[34e6ae62] | 650 | * -FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag |
---|
[175263e] | 651 | * -FDT_ERR_NOSPACE, the path of the given node is longer than (bufsize-1) |
---|
| 652 | * characters and will not fit in the given buffer. |
---|
| 653 | * -FDT_ERR_BADMAGIC, |
---|
| 654 | * -FDT_ERR_BADVERSION, |
---|
| 655 | * -FDT_ERR_BADSTATE, |
---|
| 656 | * -FDT_ERR_BADSTRUCTURE, standard meanings |
---|
| 657 | */ |
---|
| 658 | int fdt_get_path(const void *fdt, int nodeoffset, char *buf, int buflen); |
---|
| 659 | |
---|
| 660 | /** |
---|
| 661 | * fdt_supernode_atdepth_offset - find a specific ancestor of a node |
---|
| 662 | * @fdt: pointer to the device tree blob |
---|
| 663 | * @nodeoffset: offset of the node whose parent to find |
---|
| 664 | * @supernodedepth: depth of the ancestor to find |
---|
| 665 | * @nodedepth: pointer to an integer variable (will be overwritten) or NULL |
---|
| 666 | * |
---|
| 667 | * fdt_supernode_atdepth_offset() finds an ancestor of the given node |
---|
| 668 | * at a specific depth from the root (where the root itself has depth |
---|
| 669 | * 0, its immediate subnodes depth 1 and so forth). So |
---|
| 670 | * fdt_supernode_atdepth_offset(fdt, nodeoffset, 0, NULL); |
---|
| 671 | * will always return 0, the offset of the root node. If the node at |
---|
| 672 | * nodeoffset has depth D, then: |
---|
| 673 | * fdt_supernode_atdepth_offset(fdt, nodeoffset, D, NULL); |
---|
| 674 | * will return nodeoffset itself. |
---|
| 675 | * |
---|
| 676 | * NOTE: This function is expensive, as it must scan the device tree |
---|
| 677 | * structure from the start to nodeoffset. |
---|
| 678 | * |
---|
| 679 | * returns: |
---|
| 680 | * structure block offset of the node at node offset's ancestor |
---|
| 681 | * of depth supernodedepth (>=0), on success |
---|
[34e6ae62] | 682 | * -FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag |
---|
| 683 | * -FDT_ERR_NOTFOUND, supernodedepth was greater than the depth of nodeoffset |
---|
[175263e] | 684 | * -FDT_ERR_BADMAGIC, |
---|
| 685 | * -FDT_ERR_BADVERSION, |
---|
| 686 | * -FDT_ERR_BADSTATE, |
---|
| 687 | * -FDT_ERR_BADSTRUCTURE, standard meanings |
---|
| 688 | */ |
---|
| 689 | int fdt_supernode_atdepth_offset(const void *fdt, int nodeoffset, |
---|
| 690 | int supernodedepth, int *nodedepth); |
---|
| 691 | |
---|
| 692 | /** |
---|
| 693 | * fdt_node_depth - find the depth of a given node |
---|
| 694 | * @fdt: pointer to the device tree blob |
---|
| 695 | * @nodeoffset: offset of the node whose parent to find |
---|
| 696 | * |
---|
| 697 | * fdt_node_depth() finds the depth of a given node. The root node |
---|
| 698 | * has depth 0, its immediate subnodes depth 1 and so forth. |
---|
| 699 | * |
---|
| 700 | * NOTE: This function is expensive, as it must scan the device tree |
---|
| 701 | * structure from the start to nodeoffset. |
---|
| 702 | * |
---|
| 703 | * returns: |
---|
| 704 | * depth of the node at nodeoffset (>=0), on success |
---|
[34e6ae62] | 705 | * -FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag |
---|
[175263e] | 706 | * -FDT_ERR_BADMAGIC, |
---|
| 707 | * -FDT_ERR_BADVERSION, |
---|
| 708 | * -FDT_ERR_BADSTATE, |
---|
| 709 | * -FDT_ERR_BADSTRUCTURE, standard meanings |
---|
| 710 | */ |
---|
| 711 | int fdt_node_depth(const void *fdt, int nodeoffset); |
---|
| 712 | |
---|
| 713 | /** |
---|
| 714 | * fdt_parent_offset - find the parent of a given node |
---|
| 715 | * @fdt: pointer to the device tree blob |
---|
| 716 | * @nodeoffset: offset of the node whose parent to find |
---|
| 717 | * |
---|
| 718 | * fdt_parent_offset() locates the parent node of a given node (that |
---|
| 719 | * is, it finds the offset of the node which contains the node at |
---|
| 720 | * nodeoffset as a subnode). |
---|
| 721 | * |
---|
| 722 | * NOTE: This function is expensive, as it must scan the device tree |
---|
| 723 | * structure from the start to nodeoffset, *twice*. |
---|
| 724 | * |
---|
| 725 | * returns: |
---|
| 726 | * structure block offset of the parent of the node at nodeoffset |
---|
| 727 | * (>=0), on success |
---|
[34e6ae62] | 728 | * -FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag |
---|
[175263e] | 729 | * -FDT_ERR_BADMAGIC, |
---|
| 730 | * -FDT_ERR_BADVERSION, |
---|
| 731 | * -FDT_ERR_BADSTATE, |
---|
| 732 | * -FDT_ERR_BADSTRUCTURE, standard meanings |
---|
| 733 | */ |
---|
| 734 | int fdt_parent_offset(const void *fdt, int nodeoffset); |
---|
| 735 | |
---|
| 736 | /** |
---|
| 737 | * fdt_node_offset_by_prop_value - find nodes with a given property value |
---|
| 738 | * @fdt: pointer to the device tree blob |
---|
| 739 | * @startoffset: only find nodes after this offset |
---|
| 740 | * @propname: property name to check |
---|
| 741 | * @propval: property value to search for |
---|
| 742 | * @proplen: length of the value in propval |
---|
| 743 | * |
---|
| 744 | * fdt_node_offset_by_prop_value() returns the offset of the first |
---|
| 745 | * node after startoffset, which has a property named propname whose |
---|
| 746 | * value is of length proplen and has value equal to propval; or if |
---|
| 747 | * startoffset is -1, the very first such node in the tree. |
---|
| 748 | * |
---|
| 749 | * To iterate through all nodes matching the criterion, the following |
---|
| 750 | * idiom can be used: |
---|
| 751 | * offset = fdt_node_offset_by_prop_value(fdt, -1, propname, |
---|
| 752 | * propval, proplen); |
---|
| 753 | * while (offset != -FDT_ERR_NOTFOUND) { |
---|
| 754 | * // other code here |
---|
| 755 | * offset = fdt_node_offset_by_prop_value(fdt, offset, propname, |
---|
| 756 | * propval, proplen); |
---|
| 757 | * } |
---|
| 758 | * |
---|
| 759 | * Note the -1 in the first call to the function, if 0 is used here |
---|
| 760 | * instead, the function will never locate the root node, even if it |
---|
| 761 | * matches the criterion. |
---|
| 762 | * |
---|
| 763 | * returns: |
---|
| 764 | * structure block offset of the located node (>= 0, >startoffset), |
---|
| 765 | * on success |
---|
| 766 | * -FDT_ERR_NOTFOUND, no node matching the criterion exists in the |
---|
| 767 | * tree after startoffset |
---|
[34e6ae62] | 768 | * -FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag |
---|
[175263e] | 769 | * -FDT_ERR_BADMAGIC, |
---|
| 770 | * -FDT_ERR_BADVERSION, |
---|
| 771 | * -FDT_ERR_BADSTATE, |
---|
| 772 | * -FDT_ERR_BADSTRUCTURE, standard meanings |
---|
| 773 | */ |
---|
| 774 | int fdt_node_offset_by_prop_value(const void *fdt, int startoffset, |
---|
| 775 | const char *propname, |
---|
| 776 | const void *propval, int proplen); |
---|
| 777 | |
---|
| 778 | /** |
---|
| 779 | * fdt_node_offset_by_phandle - find the node with a given phandle |
---|
| 780 | * @fdt: pointer to the device tree blob |
---|
| 781 | * @phandle: phandle value |
---|
| 782 | * |
---|
| 783 | * fdt_node_offset_by_phandle() returns the offset of the node |
---|
| 784 | * which has the given phandle value. If there is more than one node |
---|
| 785 | * in the tree with the given phandle (an invalid tree), results are |
---|
| 786 | * undefined. |
---|
| 787 | * |
---|
| 788 | * returns: |
---|
| 789 | * structure block offset of the located node (>= 0), on success |
---|
| 790 | * -FDT_ERR_NOTFOUND, no node with that phandle exists |
---|
| 791 | * -FDT_ERR_BADPHANDLE, given phandle value was invalid (0 or -1) |
---|
| 792 | * -FDT_ERR_BADMAGIC, |
---|
| 793 | * -FDT_ERR_BADVERSION, |
---|
| 794 | * -FDT_ERR_BADSTATE, |
---|
| 795 | * -FDT_ERR_BADSTRUCTURE, standard meanings |
---|
| 796 | */ |
---|
| 797 | int fdt_node_offset_by_phandle(const void *fdt, uint32_t phandle); |
---|
| 798 | |
---|
| 799 | /** |
---|
| 800 | * fdt_node_check_compatible: check a node's compatible property |
---|
| 801 | * @fdt: pointer to the device tree blob |
---|
| 802 | * @nodeoffset: offset of a tree node |
---|
| 803 | * @compatible: string to match against |
---|
| 804 | * |
---|
| 805 | * |
---|
| 806 | * fdt_node_check_compatible() returns 0 if the given node contains a |
---|
| 807 | * 'compatible' property with the given string as one of its elements, |
---|
| 808 | * it returns non-zero otherwise, or on error. |
---|
| 809 | * |
---|
| 810 | * returns: |
---|
| 811 | * 0, if the node has a 'compatible' property listing the given string |
---|
| 812 | * 1, if the node has a 'compatible' property, but it does not list |
---|
| 813 | * the given string |
---|
| 814 | * -FDT_ERR_NOTFOUND, if the given node has no 'compatible' property |
---|
[34e6ae62] | 815 | * -FDT_ERR_BADOFFSET, if nodeoffset does not refer to a BEGIN_NODE tag |
---|
[175263e] | 816 | * -FDT_ERR_BADMAGIC, |
---|
| 817 | * -FDT_ERR_BADVERSION, |
---|
| 818 | * -FDT_ERR_BADSTATE, |
---|
| 819 | * -FDT_ERR_BADSTRUCTURE, standard meanings |
---|
| 820 | */ |
---|
| 821 | int fdt_node_check_compatible(const void *fdt, int nodeoffset, |
---|
| 822 | const char *compatible); |
---|
| 823 | |
---|
| 824 | /** |
---|
| 825 | * fdt_node_offset_by_compatible - find nodes with a given 'compatible' value |
---|
| 826 | * @fdt: pointer to the device tree blob |
---|
| 827 | * @startoffset: only find nodes after this offset |
---|
| 828 | * @compatible: 'compatible' string to match against |
---|
| 829 | * |
---|
| 830 | * fdt_node_offset_by_compatible() returns the offset of the first |
---|
| 831 | * node after startoffset, which has a 'compatible' property which |
---|
| 832 | * lists the given compatible string; or if startoffset is -1, the |
---|
| 833 | * very first such node in the tree. |
---|
| 834 | * |
---|
| 835 | * To iterate through all nodes matching the criterion, the following |
---|
| 836 | * idiom can be used: |
---|
| 837 | * offset = fdt_node_offset_by_compatible(fdt, -1, compatible); |
---|
| 838 | * while (offset != -FDT_ERR_NOTFOUND) { |
---|
| 839 | * // other code here |
---|
| 840 | * offset = fdt_node_offset_by_compatible(fdt, offset, compatible); |
---|
| 841 | * } |
---|
| 842 | * |
---|
| 843 | * Note the -1 in the first call to the function, if 0 is used here |
---|
| 844 | * instead, the function will never locate the root node, even if it |
---|
| 845 | * matches the criterion. |
---|
| 846 | * |
---|
| 847 | * returns: |
---|
| 848 | * structure block offset of the located node (>= 0, >startoffset), |
---|
| 849 | * on success |
---|
| 850 | * -FDT_ERR_NOTFOUND, no node matching the criterion exists in the |
---|
| 851 | * tree after startoffset |
---|
[34e6ae62] | 852 | * -FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag |
---|
[175263e] | 853 | * -FDT_ERR_BADMAGIC, |
---|
| 854 | * -FDT_ERR_BADVERSION, |
---|
| 855 | * -FDT_ERR_BADSTATE, |
---|
| 856 | * -FDT_ERR_BADSTRUCTURE, standard meanings |
---|
| 857 | */ |
---|
| 858 | int fdt_node_offset_by_compatible(const void *fdt, int startoffset, |
---|
| 859 | const char *compatible); |
---|
| 860 | |
---|
| 861 | /** |
---|
| 862 | * fdt_stringlist_contains - check a string list property for a string |
---|
| 863 | * @strlist: Property containing a list of strings to check |
---|
| 864 | * @listlen: Length of property |
---|
| 865 | * @str: String to search for |
---|
| 866 | * |
---|
| 867 | * This is a utility function provided for convenience. The list contains |
---|
| 868 | * one or more strings, each terminated by \0, as is found in a device tree |
---|
| 869 | * "compatible" property. |
---|
| 870 | * |
---|
| 871 | * @return: 1 if the string is found in the list, 0 not found, or invalid list |
---|
| 872 | */ |
---|
| 873 | int fdt_stringlist_contains(const char *strlist, int listlen, const char *str); |
---|
| 874 | |
---|
| 875 | /** |
---|
| 876 | * fdt_stringlist_count - count the number of strings in a string list |
---|
| 877 | * @fdt: pointer to the device tree blob |
---|
| 878 | * @nodeoffset: offset of a tree node |
---|
| 879 | * @property: name of the property containing the string list |
---|
| 880 | * @return: |
---|
| 881 | * the number of strings in the given property |
---|
| 882 | * -FDT_ERR_BADVALUE if the property value is not NUL-terminated |
---|
| 883 | * -FDT_ERR_NOTFOUND if the property does not exist |
---|
| 884 | */ |
---|
| 885 | int fdt_stringlist_count(const void *fdt, int nodeoffset, const char *property); |
---|
| 886 | |
---|
| 887 | /** |
---|
| 888 | * fdt_stringlist_search - find a string in a string list and return its index |
---|
| 889 | * @fdt: pointer to the device tree blob |
---|
| 890 | * @nodeoffset: offset of a tree node |
---|
| 891 | * @property: name of the property containing the string list |
---|
| 892 | * @string: string to look up in the string list |
---|
| 893 | * |
---|
| 894 | * Note that it is possible for this function to succeed on property values |
---|
| 895 | * that are not NUL-terminated. That's because the function will stop after |
---|
| 896 | * finding the first occurrence of @string. This can for example happen with |
---|
| 897 | * small-valued cell properties, such as #address-cells, when searching for |
---|
| 898 | * the empty string. |
---|
| 899 | * |
---|
| 900 | * @return: |
---|
| 901 | * the index of the string in the list of strings |
---|
| 902 | * -FDT_ERR_BADVALUE if the property value is not NUL-terminated |
---|
| 903 | * -FDT_ERR_NOTFOUND if the property does not exist or does not contain |
---|
| 904 | * the given string |
---|
| 905 | */ |
---|
| 906 | int fdt_stringlist_search(const void *fdt, int nodeoffset, const char *property, |
---|
| 907 | const char *string); |
---|
| 908 | |
---|
| 909 | /** |
---|
| 910 | * fdt_stringlist_get() - obtain the string at a given index in a string list |
---|
| 911 | * @fdt: pointer to the device tree blob |
---|
| 912 | * @nodeoffset: offset of a tree node |
---|
| 913 | * @property: name of the property containing the string list |
---|
| 914 | * @index: index of the string to return |
---|
| 915 | * @lenp: return location for the string length or an error code on failure |
---|
| 916 | * |
---|
| 917 | * Note that this will successfully extract strings from properties with |
---|
| 918 | * non-NUL-terminated values. For example on small-valued cell properties |
---|
| 919 | * this function will return the empty string. |
---|
| 920 | * |
---|
| 921 | * If non-NULL, the length of the string (on success) or a negative error-code |
---|
| 922 | * (on failure) will be stored in the integer pointer to by lenp. |
---|
| 923 | * |
---|
| 924 | * @return: |
---|
| 925 | * A pointer to the string at the given index in the string list or NULL on |
---|
| 926 | * failure. On success the length of the string will be stored in the memory |
---|
| 927 | * location pointed to by the lenp parameter, if non-NULL. On failure one of |
---|
| 928 | * the following negative error codes will be returned in the lenp parameter |
---|
| 929 | * (if non-NULL): |
---|
| 930 | * -FDT_ERR_BADVALUE if the property value is not NUL-terminated |
---|
| 931 | * -FDT_ERR_NOTFOUND if the property does not exist |
---|
| 932 | */ |
---|
| 933 | const char *fdt_stringlist_get(const void *fdt, int nodeoffset, |
---|
| 934 | const char *property, int index, |
---|
| 935 | int *lenp); |
---|
| 936 | |
---|
| 937 | /**********************************************************************/ |
---|
| 938 | /* Read-only functions (addressing related) */ |
---|
| 939 | /**********************************************************************/ |
---|
| 940 | |
---|
| 941 | /** |
---|
| 942 | * FDT_MAX_NCELLS - maximum value for #address-cells and #size-cells |
---|
| 943 | * |
---|
| 944 | * This is the maximum value for #address-cells, #size-cells and |
---|
| 945 | * similar properties that will be processed by libfdt. IEE1275 |
---|
| 946 | * requires that OF implementations handle values up to 4. |
---|
| 947 | * Implementations may support larger values, but in practice higher |
---|
| 948 | * values aren't used. |
---|
| 949 | */ |
---|
| 950 | #define FDT_MAX_NCELLS 4 |
---|
| 951 | |
---|
| 952 | /** |
---|
| 953 | * fdt_address_cells - retrieve address size for a bus represented in the tree |
---|
| 954 | * @fdt: pointer to the device tree blob |
---|
| 955 | * @nodeoffset: offset of the node to find the address size for |
---|
| 956 | * |
---|
| 957 | * When the node has a valid #address-cells property, returns its value. |
---|
| 958 | * |
---|
| 959 | * returns: |
---|
| 960 | * 0 <= n < FDT_MAX_NCELLS, on success |
---|
| 961 | * 2, if the node has no #address-cells property |
---|
| 962 | * -FDT_ERR_BADNCELLS, if the node has a badly formatted or invalid #address-cells property |
---|
| 963 | * -FDT_ERR_BADMAGIC, |
---|
| 964 | * -FDT_ERR_BADVERSION, |
---|
| 965 | * -FDT_ERR_BADSTATE, |
---|
| 966 | * -FDT_ERR_BADSTRUCTURE, |
---|
| 967 | * -FDT_ERR_TRUNCATED, standard meanings |
---|
| 968 | */ |
---|
| 969 | int fdt_address_cells(const void *fdt, int nodeoffset); |
---|
| 970 | |
---|
| 971 | /** |
---|
| 972 | * fdt_size_cells - retrieve address range size for a bus represented in the |
---|
| 973 | * tree |
---|
| 974 | * @fdt: pointer to the device tree blob |
---|
| 975 | * @nodeoffset: offset of the node to find the address range size for |
---|
| 976 | * |
---|
| 977 | * When the node has a valid #size-cells property, returns its value. |
---|
| 978 | * |
---|
| 979 | * returns: |
---|
| 980 | * 0 <= n < FDT_MAX_NCELLS, on success |
---|
| 981 | * 2, if the node has no #address-cells property |
---|
| 982 | * -FDT_ERR_BADNCELLS, if the node has a badly formatted or invalid #size-cells property |
---|
| 983 | * -FDT_ERR_BADMAGIC, |
---|
| 984 | * -FDT_ERR_BADVERSION, |
---|
| 985 | * -FDT_ERR_BADSTATE, |
---|
| 986 | * -FDT_ERR_BADSTRUCTURE, |
---|
| 987 | * -FDT_ERR_TRUNCATED, standard meanings |
---|
| 988 | */ |
---|
| 989 | int fdt_size_cells(const void *fdt, int nodeoffset); |
---|
| 990 | |
---|
| 991 | |
---|
| 992 | /**********************************************************************/ |
---|
| 993 | /* Write-in-place functions */ |
---|
| 994 | /**********************************************************************/ |
---|
| 995 | |
---|
| 996 | /** |
---|
| 997 | * fdt_setprop_inplace - change a property's value, but not its size |
---|
| 998 | * @fdt: pointer to the device tree blob |
---|
| 999 | * @nodeoffset: offset of the node whose property to change |
---|
| 1000 | * @name: name of the property to change |
---|
| 1001 | * @val: pointer to data to replace the property value with |
---|
| 1002 | * @len: length of the property value |
---|
| 1003 | * |
---|
| 1004 | * fdt_setprop_inplace() replaces the value of a given property with |
---|
| 1005 | * the data in val, of length len. This function cannot change the |
---|
| 1006 | * size of a property, and so will only work if len is equal to the |
---|
| 1007 | * current length of the property. |
---|
| 1008 | * |
---|
| 1009 | * This function will alter only the bytes in the blob which contain |
---|
| 1010 | * the given property value, and will not alter or move any other part |
---|
| 1011 | * of the tree. |
---|
| 1012 | * |
---|
| 1013 | * returns: |
---|
| 1014 | * 0, on success |
---|
| 1015 | * -FDT_ERR_NOSPACE, if len is not equal to the property's current length |
---|
| 1016 | * -FDT_ERR_NOTFOUND, node does not have the named property |
---|
| 1017 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag |
---|
| 1018 | * -FDT_ERR_BADMAGIC, |
---|
| 1019 | * -FDT_ERR_BADVERSION, |
---|
| 1020 | * -FDT_ERR_BADSTATE, |
---|
| 1021 | * -FDT_ERR_BADSTRUCTURE, |
---|
| 1022 | * -FDT_ERR_TRUNCATED, standard meanings |
---|
| 1023 | */ |
---|
| 1024 | int fdt_setprop_inplace(void *fdt, int nodeoffset, const char *name, |
---|
| 1025 | const void *val, int len); |
---|
| 1026 | |
---|
| 1027 | /** |
---|
| 1028 | * fdt_setprop_inplace_u32 - change the value of a 32-bit integer property |
---|
| 1029 | * @fdt: pointer to the device tree blob |
---|
| 1030 | * @nodeoffset: offset of the node whose property to change |
---|
| 1031 | * @name: name of the property to change |
---|
| 1032 | * @val: 32-bit integer value to replace the property with |
---|
| 1033 | * |
---|
| 1034 | * fdt_setprop_inplace_u32() replaces the value of a given property |
---|
| 1035 | * with the 32-bit integer value in val, converting val to big-endian |
---|
| 1036 | * if necessary. This function cannot change the size of a property, |
---|
| 1037 | * and so will only work if the property already exists and has length |
---|
| 1038 | * 4. |
---|
| 1039 | * |
---|
| 1040 | * This function will alter only the bytes in the blob which contain |
---|
| 1041 | * the given property value, and will not alter or move any other part |
---|
| 1042 | * of the tree. |
---|
| 1043 | * |
---|
| 1044 | * returns: |
---|
| 1045 | * 0, on success |
---|
| 1046 | * -FDT_ERR_NOSPACE, if the property's length is not equal to 4 |
---|
| 1047 | * -FDT_ERR_NOTFOUND, node does not have the named property |
---|
| 1048 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag |
---|
| 1049 | * -FDT_ERR_BADMAGIC, |
---|
| 1050 | * -FDT_ERR_BADVERSION, |
---|
| 1051 | * -FDT_ERR_BADSTATE, |
---|
| 1052 | * -FDT_ERR_BADSTRUCTURE, |
---|
| 1053 | * -FDT_ERR_TRUNCATED, standard meanings |
---|
| 1054 | */ |
---|
| 1055 | static inline int fdt_setprop_inplace_u32(void *fdt, int nodeoffset, |
---|
| 1056 | const char *name, uint32_t val) |
---|
| 1057 | { |
---|
| 1058 | fdt32_t tmp = cpu_to_fdt32(val); |
---|
| 1059 | return fdt_setprop_inplace(fdt, nodeoffset, name, &tmp, sizeof(tmp)); |
---|
| 1060 | } |
---|
| 1061 | |
---|
| 1062 | /** |
---|
| 1063 | * fdt_setprop_inplace_u64 - change the value of a 64-bit integer property |
---|
| 1064 | * @fdt: pointer to the device tree blob |
---|
| 1065 | * @nodeoffset: offset of the node whose property to change |
---|
| 1066 | * @name: name of the property to change |
---|
| 1067 | * @val: 64-bit integer value to replace the property with |
---|
| 1068 | * |
---|
| 1069 | * fdt_setprop_inplace_u64() replaces the value of a given property |
---|
| 1070 | * with the 64-bit integer value in val, converting val to big-endian |
---|
| 1071 | * if necessary. This function cannot change the size of a property, |
---|
| 1072 | * and so will only work if the property already exists and has length |
---|
| 1073 | * 8. |
---|
| 1074 | * |
---|
| 1075 | * This function will alter only the bytes in the blob which contain |
---|
| 1076 | * the given property value, and will not alter or move any other part |
---|
| 1077 | * of the tree. |
---|
| 1078 | * |
---|
| 1079 | * returns: |
---|
| 1080 | * 0, on success |
---|
| 1081 | * -FDT_ERR_NOSPACE, if the property's length is not equal to 8 |
---|
| 1082 | * -FDT_ERR_NOTFOUND, node does not have the named property |
---|
| 1083 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag |
---|
| 1084 | * -FDT_ERR_BADMAGIC, |
---|
| 1085 | * -FDT_ERR_BADVERSION, |
---|
| 1086 | * -FDT_ERR_BADSTATE, |
---|
| 1087 | * -FDT_ERR_BADSTRUCTURE, |
---|
| 1088 | * -FDT_ERR_TRUNCATED, standard meanings |
---|
| 1089 | */ |
---|
| 1090 | static inline int fdt_setprop_inplace_u64(void *fdt, int nodeoffset, |
---|
| 1091 | const char *name, uint64_t val) |
---|
| 1092 | { |
---|
| 1093 | fdt64_t tmp = cpu_to_fdt64(val); |
---|
| 1094 | return fdt_setprop_inplace(fdt, nodeoffset, name, &tmp, sizeof(tmp)); |
---|
| 1095 | } |
---|
| 1096 | |
---|
| 1097 | /** |
---|
| 1098 | * fdt_setprop_inplace_cell - change the value of a single-cell property |
---|
| 1099 | * |
---|
| 1100 | * This is an alternative name for fdt_setprop_inplace_u32() |
---|
| 1101 | */ |
---|
| 1102 | static inline int fdt_setprop_inplace_cell(void *fdt, int nodeoffset, |
---|
| 1103 | const char *name, uint32_t val) |
---|
| 1104 | { |
---|
| 1105 | return fdt_setprop_inplace_u32(fdt, nodeoffset, name, val); |
---|
| 1106 | } |
---|
| 1107 | |
---|
| 1108 | /** |
---|
| 1109 | * fdt_nop_property - replace a property with nop tags |
---|
| 1110 | * @fdt: pointer to the device tree blob |
---|
| 1111 | * @nodeoffset: offset of the node whose property to nop |
---|
| 1112 | * @name: name of the property to nop |
---|
| 1113 | * |
---|
| 1114 | * fdt_nop_property() will replace a given property's representation |
---|
| 1115 | * in the blob with FDT_NOP tags, effectively removing it from the |
---|
| 1116 | * tree. |
---|
| 1117 | * |
---|
| 1118 | * This function will alter only the bytes in the blob which contain |
---|
| 1119 | * the property, and will not alter or move any other part of the |
---|
| 1120 | * tree. |
---|
| 1121 | * |
---|
| 1122 | * returns: |
---|
| 1123 | * 0, on success |
---|
| 1124 | * -FDT_ERR_NOTFOUND, node does not have the named property |
---|
| 1125 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag |
---|
| 1126 | * -FDT_ERR_BADMAGIC, |
---|
| 1127 | * -FDT_ERR_BADVERSION, |
---|
| 1128 | * -FDT_ERR_BADSTATE, |
---|
| 1129 | * -FDT_ERR_BADSTRUCTURE, |
---|
| 1130 | * -FDT_ERR_TRUNCATED, standard meanings |
---|
| 1131 | */ |
---|
| 1132 | int fdt_nop_property(void *fdt, int nodeoffset, const char *name); |
---|
| 1133 | |
---|
| 1134 | /** |
---|
| 1135 | * fdt_nop_node - replace a node (subtree) with nop tags |
---|
| 1136 | * @fdt: pointer to the device tree blob |
---|
| 1137 | * @nodeoffset: offset of the node to nop |
---|
| 1138 | * |
---|
| 1139 | * fdt_nop_node() will replace a given node's representation in the |
---|
| 1140 | * blob, including all its subnodes, if any, with FDT_NOP tags, |
---|
| 1141 | * effectively removing it from the tree. |
---|
| 1142 | * |
---|
| 1143 | * This function will alter only the bytes in the blob which contain |
---|
| 1144 | * the node and its properties and subnodes, and will not alter or |
---|
| 1145 | * move any other part of the tree. |
---|
| 1146 | * |
---|
| 1147 | * returns: |
---|
| 1148 | * 0, on success |
---|
| 1149 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag |
---|
| 1150 | * -FDT_ERR_BADMAGIC, |
---|
| 1151 | * -FDT_ERR_BADVERSION, |
---|
| 1152 | * -FDT_ERR_BADSTATE, |
---|
| 1153 | * -FDT_ERR_BADSTRUCTURE, |
---|
| 1154 | * -FDT_ERR_TRUNCATED, standard meanings |
---|
| 1155 | */ |
---|
| 1156 | int fdt_nop_node(void *fdt, int nodeoffset); |
---|
| 1157 | |
---|
| 1158 | /**********************************************************************/ |
---|
| 1159 | /* Sequential write functions */ |
---|
| 1160 | /**********************************************************************/ |
---|
| 1161 | |
---|
| 1162 | int fdt_create(void *buf, int bufsize); |
---|
| 1163 | int fdt_resize(void *fdt, void *buf, int bufsize); |
---|
| 1164 | int fdt_add_reservemap_entry(void *fdt, uint64_t addr, uint64_t size); |
---|
| 1165 | int fdt_finish_reservemap(void *fdt); |
---|
| 1166 | int fdt_begin_node(void *fdt, const char *name); |
---|
| 1167 | int fdt_property(void *fdt, const char *name, const void *val, int len); |
---|
| 1168 | static inline int fdt_property_u32(void *fdt, const char *name, uint32_t val) |
---|
| 1169 | { |
---|
| 1170 | fdt32_t tmp = cpu_to_fdt32(val); |
---|
| 1171 | return fdt_property(fdt, name, &tmp, sizeof(tmp)); |
---|
| 1172 | } |
---|
| 1173 | static inline int fdt_property_u64(void *fdt, const char *name, uint64_t val) |
---|
| 1174 | { |
---|
| 1175 | fdt64_t tmp = cpu_to_fdt64(val); |
---|
| 1176 | return fdt_property(fdt, name, &tmp, sizeof(tmp)); |
---|
| 1177 | } |
---|
| 1178 | static inline int fdt_property_cell(void *fdt, const char *name, uint32_t val) |
---|
| 1179 | { |
---|
| 1180 | return fdt_property_u32(fdt, name, val); |
---|
| 1181 | } |
---|
| 1182 | #define fdt_property_string(fdt, name, str) \ |
---|
| 1183 | fdt_property(fdt, name, str, strlen(str)+1) |
---|
| 1184 | int fdt_end_node(void *fdt); |
---|
| 1185 | int fdt_finish(void *fdt); |
---|
| 1186 | |
---|
| 1187 | /**********************************************************************/ |
---|
| 1188 | /* Read-write functions */ |
---|
| 1189 | /**********************************************************************/ |
---|
| 1190 | |
---|
| 1191 | int fdt_create_empty_tree(void *buf, int bufsize); |
---|
| 1192 | int fdt_open_into(const void *fdt, void *buf, int bufsize); |
---|
| 1193 | int fdt_pack(void *fdt); |
---|
| 1194 | |
---|
| 1195 | /** |
---|
| 1196 | * fdt_add_mem_rsv - add one memory reserve map entry |
---|
| 1197 | * @fdt: pointer to the device tree blob |
---|
| 1198 | * @address, @size: 64-bit values (native endian) |
---|
| 1199 | * |
---|
| 1200 | * Adds a reserve map entry to the given blob reserving a region at |
---|
| 1201 | * address address of length size. |
---|
| 1202 | * |
---|
| 1203 | * This function will insert data into the reserve map and will |
---|
| 1204 | * therefore change the indexes of some entries in the table. |
---|
| 1205 | * |
---|
| 1206 | * returns: |
---|
| 1207 | * 0, on success |
---|
| 1208 | * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to |
---|
| 1209 | * contain the new reservation entry |
---|
| 1210 | * -FDT_ERR_BADMAGIC, |
---|
| 1211 | * -FDT_ERR_BADVERSION, |
---|
| 1212 | * -FDT_ERR_BADSTATE, |
---|
| 1213 | * -FDT_ERR_BADSTRUCTURE, |
---|
| 1214 | * -FDT_ERR_BADLAYOUT, |
---|
| 1215 | * -FDT_ERR_TRUNCATED, standard meanings |
---|
| 1216 | */ |
---|
| 1217 | int fdt_add_mem_rsv(void *fdt, uint64_t address, uint64_t size); |
---|
| 1218 | |
---|
| 1219 | /** |
---|
| 1220 | * fdt_del_mem_rsv - remove a memory reserve map entry |
---|
| 1221 | * @fdt: pointer to the device tree blob |
---|
| 1222 | * @n: entry to remove |
---|
| 1223 | * |
---|
| 1224 | * fdt_del_mem_rsv() removes the n-th memory reserve map entry from |
---|
| 1225 | * the blob. |
---|
| 1226 | * |
---|
| 1227 | * This function will delete data from the reservation table and will |
---|
| 1228 | * therefore change the indexes of some entries in the table. |
---|
| 1229 | * |
---|
| 1230 | * returns: |
---|
| 1231 | * 0, on success |
---|
| 1232 | * -FDT_ERR_NOTFOUND, there is no entry of the given index (i.e. there |
---|
| 1233 | * are less than n+1 reserve map entries) |
---|
| 1234 | * -FDT_ERR_BADMAGIC, |
---|
| 1235 | * -FDT_ERR_BADVERSION, |
---|
| 1236 | * -FDT_ERR_BADSTATE, |
---|
| 1237 | * -FDT_ERR_BADSTRUCTURE, |
---|
| 1238 | * -FDT_ERR_BADLAYOUT, |
---|
| 1239 | * -FDT_ERR_TRUNCATED, standard meanings |
---|
| 1240 | */ |
---|
| 1241 | int fdt_del_mem_rsv(void *fdt, int n); |
---|
| 1242 | |
---|
| 1243 | /** |
---|
| 1244 | * fdt_set_name - change the name of a given node |
---|
| 1245 | * @fdt: pointer to the device tree blob |
---|
| 1246 | * @nodeoffset: structure block offset of a node |
---|
| 1247 | * @name: name to give the node |
---|
| 1248 | * |
---|
| 1249 | * fdt_set_name() replaces the name (including unit address, if any) |
---|
| 1250 | * of the given node with the given string. NOTE: this function can't |
---|
| 1251 | * efficiently check if the new name is unique amongst the given |
---|
| 1252 | * node's siblings; results are undefined if this function is invoked |
---|
| 1253 | * with a name equal to one of the given node's siblings. |
---|
| 1254 | * |
---|
| 1255 | * This function may insert or delete data from the blob, and will |
---|
| 1256 | * therefore change the offsets of some existing nodes. |
---|
| 1257 | * |
---|
| 1258 | * returns: |
---|
| 1259 | * 0, on success |
---|
| 1260 | * -FDT_ERR_NOSPACE, there is insufficient free space in the blob |
---|
| 1261 | * to contain the new name |
---|
| 1262 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag |
---|
| 1263 | * -FDT_ERR_BADMAGIC, |
---|
| 1264 | * -FDT_ERR_BADVERSION, |
---|
| 1265 | * -FDT_ERR_BADSTATE, standard meanings |
---|
| 1266 | */ |
---|
| 1267 | int fdt_set_name(void *fdt, int nodeoffset, const char *name); |
---|
| 1268 | |
---|
| 1269 | /** |
---|
| 1270 | * fdt_setprop - create or change a property |
---|
| 1271 | * @fdt: pointer to the device tree blob |
---|
| 1272 | * @nodeoffset: offset of the node whose property to change |
---|
| 1273 | * @name: name of the property to change |
---|
| 1274 | * @val: pointer to data to set the property value to |
---|
| 1275 | * @len: length of the property value |
---|
| 1276 | * |
---|
| 1277 | * fdt_setprop() sets the value of the named property in the given |
---|
| 1278 | * node to the given value and length, creating the property if it |
---|
| 1279 | * does not already exist. |
---|
| 1280 | * |
---|
| 1281 | * This function may insert or delete data from the blob, and will |
---|
| 1282 | * therefore change the offsets of some existing nodes. |
---|
| 1283 | * |
---|
| 1284 | * returns: |
---|
| 1285 | * 0, on success |
---|
| 1286 | * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to |
---|
| 1287 | * contain the new property value |
---|
| 1288 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag |
---|
| 1289 | * -FDT_ERR_BADLAYOUT, |
---|
| 1290 | * -FDT_ERR_BADMAGIC, |
---|
| 1291 | * -FDT_ERR_BADVERSION, |
---|
| 1292 | * -FDT_ERR_BADSTATE, |
---|
| 1293 | * -FDT_ERR_BADSTRUCTURE, |
---|
| 1294 | * -FDT_ERR_BADLAYOUT, |
---|
| 1295 | * -FDT_ERR_TRUNCATED, standard meanings |
---|
| 1296 | */ |
---|
| 1297 | int fdt_setprop(void *fdt, int nodeoffset, const char *name, |
---|
| 1298 | const void *val, int len); |
---|
| 1299 | |
---|
| 1300 | /** |
---|
| 1301 | * fdt_setprop_u32 - set a property to a 32-bit integer |
---|
| 1302 | * @fdt: pointer to the device tree blob |
---|
| 1303 | * @nodeoffset: offset of the node whose property to change |
---|
| 1304 | * @name: name of the property to change |
---|
| 1305 | * @val: 32-bit integer value for the property (native endian) |
---|
| 1306 | * |
---|
| 1307 | * fdt_setprop_u32() sets the value of the named property in the given |
---|
| 1308 | * node to the given 32-bit integer value (converting to big-endian if |
---|
| 1309 | * necessary), or creates a new property with that value if it does |
---|
| 1310 | * not already exist. |
---|
| 1311 | * |
---|
| 1312 | * This function may insert or delete data from the blob, and will |
---|
| 1313 | * therefore change the offsets of some existing nodes. |
---|
| 1314 | * |
---|
| 1315 | * returns: |
---|
| 1316 | * 0, on success |
---|
| 1317 | * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to |
---|
| 1318 | * contain the new property value |
---|
| 1319 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag |
---|
| 1320 | * -FDT_ERR_BADLAYOUT, |
---|
| 1321 | * -FDT_ERR_BADMAGIC, |
---|
| 1322 | * -FDT_ERR_BADVERSION, |
---|
| 1323 | * -FDT_ERR_BADSTATE, |
---|
| 1324 | * -FDT_ERR_BADSTRUCTURE, |
---|
| 1325 | * -FDT_ERR_BADLAYOUT, |
---|
| 1326 | * -FDT_ERR_TRUNCATED, standard meanings |
---|
| 1327 | */ |
---|
| 1328 | static inline int fdt_setprop_u32(void *fdt, int nodeoffset, const char *name, |
---|
| 1329 | uint32_t val) |
---|
| 1330 | { |
---|
| 1331 | fdt32_t tmp = cpu_to_fdt32(val); |
---|
| 1332 | return fdt_setprop(fdt, nodeoffset, name, &tmp, sizeof(tmp)); |
---|
| 1333 | } |
---|
| 1334 | |
---|
| 1335 | /** |
---|
| 1336 | * fdt_setprop_u64 - set a property to a 64-bit integer |
---|
| 1337 | * @fdt: pointer to the device tree blob |
---|
| 1338 | * @nodeoffset: offset of the node whose property to change |
---|
| 1339 | * @name: name of the property to change |
---|
| 1340 | * @val: 64-bit integer value for the property (native endian) |
---|
| 1341 | * |
---|
| 1342 | * fdt_setprop_u64() sets the value of the named property in the given |
---|
| 1343 | * node to the given 64-bit integer value (converting to big-endian if |
---|
| 1344 | * necessary), or creates a new property with that value if it does |
---|
| 1345 | * not already exist. |
---|
| 1346 | * |
---|
| 1347 | * This function may insert or delete data from the blob, and will |
---|
| 1348 | * therefore change the offsets of some existing nodes. |
---|
| 1349 | * |
---|
| 1350 | * returns: |
---|
| 1351 | * 0, on success |
---|
| 1352 | * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to |
---|
| 1353 | * contain the new property value |
---|
| 1354 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag |
---|
| 1355 | * -FDT_ERR_BADLAYOUT, |
---|
| 1356 | * -FDT_ERR_BADMAGIC, |
---|
| 1357 | * -FDT_ERR_BADVERSION, |
---|
| 1358 | * -FDT_ERR_BADSTATE, |
---|
| 1359 | * -FDT_ERR_BADSTRUCTURE, |
---|
| 1360 | * -FDT_ERR_BADLAYOUT, |
---|
| 1361 | * -FDT_ERR_TRUNCATED, standard meanings |
---|
| 1362 | */ |
---|
| 1363 | static inline int fdt_setprop_u64(void *fdt, int nodeoffset, const char *name, |
---|
| 1364 | uint64_t val) |
---|
| 1365 | { |
---|
| 1366 | fdt64_t tmp = cpu_to_fdt64(val); |
---|
| 1367 | return fdt_setprop(fdt, nodeoffset, name, &tmp, sizeof(tmp)); |
---|
| 1368 | } |
---|
| 1369 | |
---|
| 1370 | /** |
---|
| 1371 | * fdt_setprop_cell - set a property to a single cell value |
---|
| 1372 | * |
---|
| 1373 | * This is an alternative name for fdt_setprop_u32() |
---|
| 1374 | */ |
---|
| 1375 | static inline int fdt_setprop_cell(void *fdt, int nodeoffset, const char *name, |
---|
| 1376 | uint32_t val) |
---|
| 1377 | { |
---|
| 1378 | return fdt_setprop_u32(fdt, nodeoffset, name, val); |
---|
| 1379 | } |
---|
| 1380 | |
---|
| 1381 | /** |
---|
| 1382 | * fdt_setprop_string - set a property to a string value |
---|
| 1383 | * @fdt: pointer to the device tree blob |
---|
| 1384 | * @nodeoffset: offset of the node whose property to change |
---|
| 1385 | * @name: name of the property to change |
---|
| 1386 | * @str: string value for the property |
---|
| 1387 | * |
---|
| 1388 | * fdt_setprop_string() sets the value of the named property in the |
---|
| 1389 | * given node to the given string value (using the length of the |
---|
| 1390 | * string to determine the new length of the property), or creates a |
---|
| 1391 | * new property with that value if it does not already exist. |
---|
| 1392 | * |
---|
| 1393 | * This function may insert or delete data from the blob, and will |
---|
| 1394 | * therefore change the offsets of some existing nodes. |
---|
| 1395 | * |
---|
| 1396 | * returns: |
---|
| 1397 | * 0, on success |
---|
| 1398 | * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to |
---|
| 1399 | * contain the new property value |
---|
| 1400 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag |
---|
| 1401 | * -FDT_ERR_BADLAYOUT, |
---|
| 1402 | * -FDT_ERR_BADMAGIC, |
---|
| 1403 | * -FDT_ERR_BADVERSION, |
---|
| 1404 | * -FDT_ERR_BADSTATE, |
---|
| 1405 | * -FDT_ERR_BADSTRUCTURE, |
---|
| 1406 | * -FDT_ERR_BADLAYOUT, |
---|
| 1407 | * -FDT_ERR_TRUNCATED, standard meanings |
---|
| 1408 | */ |
---|
| 1409 | #define fdt_setprop_string(fdt, nodeoffset, name, str) \ |
---|
| 1410 | fdt_setprop((fdt), (nodeoffset), (name), (str), strlen(str)+1) |
---|
| 1411 | |
---|
| 1412 | /** |
---|
| 1413 | * fdt_appendprop - append to or create a property |
---|
| 1414 | * @fdt: pointer to the device tree blob |
---|
| 1415 | * @nodeoffset: offset of the node whose property to change |
---|
| 1416 | * @name: name of the property to append to |
---|
| 1417 | * @val: pointer to data to append to the property value |
---|
| 1418 | * @len: length of the data to append to the property value |
---|
| 1419 | * |
---|
| 1420 | * fdt_appendprop() appends the value to the named property in the |
---|
| 1421 | * given node, creating the property if it does not already exist. |
---|
| 1422 | * |
---|
| 1423 | * This function may insert data into the blob, and will therefore |
---|
| 1424 | * change the offsets of some existing nodes. |
---|
| 1425 | * |
---|
| 1426 | * returns: |
---|
| 1427 | * 0, on success |
---|
| 1428 | * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to |
---|
| 1429 | * contain the new property value |
---|
| 1430 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag |
---|
| 1431 | * -FDT_ERR_BADLAYOUT, |
---|
| 1432 | * -FDT_ERR_BADMAGIC, |
---|
| 1433 | * -FDT_ERR_BADVERSION, |
---|
| 1434 | * -FDT_ERR_BADSTATE, |
---|
| 1435 | * -FDT_ERR_BADSTRUCTURE, |
---|
| 1436 | * -FDT_ERR_BADLAYOUT, |
---|
| 1437 | * -FDT_ERR_TRUNCATED, standard meanings |
---|
| 1438 | */ |
---|
| 1439 | int fdt_appendprop(void *fdt, int nodeoffset, const char *name, |
---|
| 1440 | const void *val, int len); |
---|
| 1441 | |
---|
| 1442 | /** |
---|
| 1443 | * fdt_appendprop_u32 - append a 32-bit integer value to a property |
---|
| 1444 | * @fdt: pointer to the device tree blob |
---|
| 1445 | * @nodeoffset: offset of the node whose property to change |
---|
| 1446 | * @name: name of the property to change |
---|
| 1447 | * @val: 32-bit integer value to append to the property (native endian) |
---|
| 1448 | * |
---|
| 1449 | * fdt_appendprop_u32() appends the given 32-bit integer value |
---|
| 1450 | * (converting to big-endian if necessary) to the value of the named |
---|
| 1451 | * property in the given node, or creates a new property with that |
---|
| 1452 | * value if it does not already exist. |
---|
| 1453 | * |
---|
| 1454 | * This function may insert data into the blob, and will therefore |
---|
| 1455 | * change the offsets of some existing nodes. |
---|
| 1456 | * |
---|
| 1457 | * returns: |
---|
| 1458 | * 0, on success |
---|
| 1459 | * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to |
---|
| 1460 | * contain the new property value |
---|
| 1461 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag |
---|
| 1462 | * -FDT_ERR_BADLAYOUT, |
---|
| 1463 | * -FDT_ERR_BADMAGIC, |
---|
| 1464 | * -FDT_ERR_BADVERSION, |
---|
| 1465 | * -FDT_ERR_BADSTATE, |
---|
| 1466 | * -FDT_ERR_BADSTRUCTURE, |
---|
| 1467 | * -FDT_ERR_BADLAYOUT, |
---|
| 1468 | * -FDT_ERR_TRUNCATED, standard meanings |
---|
| 1469 | */ |
---|
| 1470 | static inline int fdt_appendprop_u32(void *fdt, int nodeoffset, |
---|
| 1471 | const char *name, uint32_t val) |
---|
| 1472 | { |
---|
| 1473 | fdt32_t tmp = cpu_to_fdt32(val); |
---|
| 1474 | return fdt_appendprop(fdt, nodeoffset, name, &tmp, sizeof(tmp)); |
---|
| 1475 | } |
---|
| 1476 | |
---|
| 1477 | /** |
---|
| 1478 | * fdt_appendprop_u64 - append a 64-bit integer value to a property |
---|
| 1479 | * @fdt: pointer to the device tree blob |
---|
| 1480 | * @nodeoffset: offset of the node whose property to change |
---|
| 1481 | * @name: name of the property to change |
---|
| 1482 | * @val: 64-bit integer value to append to the property (native endian) |
---|
| 1483 | * |
---|
| 1484 | * fdt_appendprop_u64() appends the given 64-bit integer value |
---|
| 1485 | * (converting to big-endian if necessary) to the value of the named |
---|
| 1486 | * property in the given node, or creates a new property with that |
---|
| 1487 | * value if it does not already exist. |
---|
| 1488 | * |
---|
| 1489 | * This function may insert data into the blob, and will therefore |
---|
| 1490 | * change the offsets of some existing nodes. |
---|
| 1491 | * |
---|
| 1492 | * returns: |
---|
| 1493 | * 0, on success |
---|
| 1494 | * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to |
---|
| 1495 | * contain the new property value |
---|
| 1496 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag |
---|
| 1497 | * -FDT_ERR_BADLAYOUT, |
---|
| 1498 | * -FDT_ERR_BADMAGIC, |
---|
| 1499 | * -FDT_ERR_BADVERSION, |
---|
| 1500 | * -FDT_ERR_BADSTATE, |
---|
| 1501 | * -FDT_ERR_BADSTRUCTURE, |
---|
| 1502 | * -FDT_ERR_BADLAYOUT, |
---|
| 1503 | * -FDT_ERR_TRUNCATED, standard meanings |
---|
| 1504 | */ |
---|
| 1505 | static inline int fdt_appendprop_u64(void *fdt, int nodeoffset, |
---|
| 1506 | const char *name, uint64_t val) |
---|
| 1507 | { |
---|
| 1508 | fdt64_t tmp = cpu_to_fdt64(val); |
---|
| 1509 | return fdt_appendprop(fdt, nodeoffset, name, &tmp, sizeof(tmp)); |
---|
| 1510 | } |
---|
| 1511 | |
---|
| 1512 | /** |
---|
| 1513 | * fdt_appendprop_cell - append a single cell value to a property |
---|
| 1514 | * |
---|
| 1515 | * This is an alternative name for fdt_appendprop_u32() |
---|
| 1516 | */ |
---|
| 1517 | static inline int fdt_appendprop_cell(void *fdt, int nodeoffset, |
---|
| 1518 | const char *name, uint32_t val) |
---|
| 1519 | { |
---|
| 1520 | return fdt_appendprop_u32(fdt, nodeoffset, name, val); |
---|
| 1521 | } |
---|
| 1522 | |
---|
| 1523 | /** |
---|
| 1524 | * fdt_appendprop_string - append a string to a property |
---|
| 1525 | * @fdt: pointer to the device tree blob |
---|
| 1526 | * @nodeoffset: offset of the node whose property to change |
---|
| 1527 | * @name: name of the property to change |
---|
| 1528 | * @str: string value to append to the property |
---|
| 1529 | * |
---|
| 1530 | * fdt_appendprop_string() appends the given string to the value of |
---|
| 1531 | * the named property in the given node, or creates a new property |
---|
| 1532 | * with that value if it does not already exist. |
---|
| 1533 | * |
---|
| 1534 | * This function may insert data into the blob, and will therefore |
---|
| 1535 | * change the offsets of some existing nodes. |
---|
| 1536 | * |
---|
| 1537 | * returns: |
---|
| 1538 | * 0, on success |
---|
| 1539 | * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to |
---|
| 1540 | * contain the new property value |
---|
| 1541 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag |
---|
| 1542 | * -FDT_ERR_BADLAYOUT, |
---|
| 1543 | * -FDT_ERR_BADMAGIC, |
---|
| 1544 | * -FDT_ERR_BADVERSION, |
---|
| 1545 | * -FDT_ERR_BADSTATE, |
---|
| 1546 | * -FDT_ERR_BADSTRUCTURE, |
---|
| 1547 | * -FDT_ERR_BADLAYOUT, |
---|
| 1548 | * -FDT_ERR_TRUNCATED, standard meanings |
---|
| 1549 | */ |
---|
| 1550 | #define fdt_appendprop_string(fdt, nodeoffset, name, str) \ |
---|
| 1551 | fdt_appendprop((fdt), (nodeoffset), (name), (str), strlen(str)+1) |
---|
| 1552 | |
---|
| 1553 | /** |
---|
| 1554 | * fdt_delprop - delete a property |
---|
| 1555 | * @fdt: pointer to the device tree blob |
---|
| 1556 | * @nodeoffset: offset of the node whose property to nop |
---|
| 1557 | * @name: name of the property to nop |
---|
| 1558 | * |
---|
| 1559 | * fdt_del_property() will delete the given property. |
---|
| 1560 | * |
---|
| 1561 | * This function will delete data from the blob, and will therefore |
---|
| 1562 | * change the offsets of some existing nodes. |
---|
| 1563 | * |
---|
| 1564 | * returns: |
---|
| 1565 | * 0, on success |
---|
| 1566 | * -FDT_ERR_NOTFOUND, node does not have the named property |
---|
| 1567 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag |
---|
| 1568 | * -FDT_ERR_BADLAYOUT, |
---|
| 1569 | * -FDT_ERR_BADMAGIC, |
---|
| 1570 | * -FDT_ERR_BADVERSION, |
---|
| 1571 | * -FDT_ERR_BADSTATE, |
---|
| 1572 | * -FDT_ERR_BADSTRUCTURE, |
---|
| 1573 | * -FDT_ERR_TRUNCATED, standard meanings |
---|
| 1574 | */ |
---|
| 1575 | int fdt_delprop(void *fdt, int nodeoffset, const char *name); |
---|
| 1576 | |
---|
| 1577 | /** |
---|
| 1578 | * fdt_add_subnode_namelen - creates a new node based on substring |
---|
| 1579 | * @fdt: pointer to the device tree blob |
---|
| 1580 | * @parentoffset: structure block offset of a node |
---|
| 1581 | * @name: name of the subnode to locate |
---|
| 1582 | * @namelen: number of characters of name to consider |
---|
| 1583 | * |
---|
| 1584 | * Identical to fdt_add_subnode(), but use only the first namelen |
---|
| 1585 | * characters of name as the name of the new node. This is useful for |
---|
| 1586 | * creating subnodes based on a portion of a larger string, such as a |
---|
| 1587 | * full path. |
---|
| 1588 | */ |
---|
| 1589 | int fdt_add_subnode_namelen(void *fdt, int parentoffset, |
---|
| 1590 | const char *name, int namelen); |
---|
| 1591 | |
---|
| 1592 | /** |
---|
| 1593 | * fdt_add_subnode - creates a new node |
---|
| 1594 | * @fdt: pointer to the device tree blob |
---|
| 1595 | * @parentoffset: structure block offset of a node |
---|
| 1596 | * @name: name of the subnode to locate |
---|
| 1597 | * |
---|
| 1598 | * fdt_add_subnode() creates a new node as a subnode of the node at |
---|
| 1599 | * structure block offset parentoffset, with the given name (which |
---|
| 1600 | * should include the unit address, if any). |
---|
| 1601 | * |
---|
| 1602 | * This function will insert data into the blob, and will therefore |
---|
| 1603 | * change the offsets of some existing nodes. |
---|
| 1604 | |
---|
| 1605 | * returns: |
---|
| 1606 | * structure block offset of the created nodeequested subnode (>=0), on success |
---|
| 1607 | * -FDT_ERR_NOTFOUND, if the requested subnode does not exist |
---|
| 1608 | * -FDT_ERR_BADOFFSET, if parentoffset did not point to an FDT_BEGIN_NODE tag |
---|
| 1609 | * -FDT_ERR_EXISTS, if the node at parentoffset already has a subnode of |
---|
| 1610 | * the given name |
---|
| 1611 | * -FDT_ERR_NOSPACE, if there is insufficient free space in the |
---|
| 1612 | * blob to contain the new node |
---|
| 1613 | * -FDT_ERR_NOSPACE |
---|
| 1614 | * -FDT_ERR_BADLAYOUT |
---|
| 1615 | * -FDT_ERR_BADMAGIC, |
---|
| 1616 | * -FDT_ERR_BADVERSION, |
---|
| 1617 | * -FDT_ERR_BADSTATE, |
---|
| 1618 | * -FDT_ERR_BADSTRUCTURE, |
---|
| 1619 | * -FDT_ERR_TRUNCATED, standard meanings. |
---|
| 1620 | */ |
---|
| 1621 | int fdt_add_subnode(void *fdt, int parentoffset, const char *name); |
---|
| 1622 | |
---|
| 1623 | /** |
---|
| 1624 | * fdt_del_node - delete a node (subtree) |
---|
| 1625 | * @fdt: pointer to the device tree blob |
---|
| 1626 | * @nodeoffset: offset of the node to nop |
---|
| 1627 | * |
---|
| 1628 | * fdt_del_node() will remove the given node, including all its |
---|
| 1629 | * subnodes if any, from the blob. |
---|
| 1630 | * |
---|
| 1631 | * This function will delete data from the blob, and will therefore |
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| 1632 | * change the offsets of some existing nodes. |
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| 1633 | * |
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| 1634 | * returns: |
---|
| 1635 | * 0, on success |
---|
| 1636 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag |
---|
| 1637 | * -FDT_ERR_BADLAYOUT, |
---|
| 1638 | * -FDT_ERR_BADMAGIC, |
---|
| 1639 | * -FDT_ERR_BADVERSION, |
---|
| 1640 | * -FDT_ERR_BADSTATE, |
---|
| 1641 | * -FDT_ERR_BADSTRUCTURE, |
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| 1642 | * -FDT_ERR_TRUNCATED, standard meanings |
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| 1643 | */ |
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| 1644 | int fdt_del_node(void *fdt, int nodeoffset); |
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| 1645 | |
---|
| 1646 | /**********************************************************************/ |
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| 1647 | /* Debugging / informational functions */ |
---|
| 1648 | /**********************************************************************/ |
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| 1649 | |
---|
| 1650 | const char *fdt_strerror(int errval); |
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| 1651 | |
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| 1652 | #endif /* _LIBFDT_H */ |
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