1 /* 2 * Copyright (c) 2006-2023, RT-Thread Development Team 3 * 4 * SPDX-License-Identifier: Apache-2.0 5 * 6 * Change Logs: 7 * Date Author Notes 8 * 2022-12-20 RT-Thread the first version 9 */ 10 11 #ifndef _FDT_H 12 #define _FDT_H 13 /* 14 * libfdt - Flat Device Tree manipulation 15 * Copyright (C) 2006 David Gibson, IBM Corporation. 16 * Copyright 2012 Kim Phillips, Freescale Semiconductor. 17 * 18 * libfdt is dual licensed: you can use it either under the terms of 19 * the GPL, or the BSD license, at your option. 20 * 21 * a) This library is free software; you can redistribute it and/or 22 * modify it under the terms of the GNU General Public License as 23 * published by the Free Software Foundation; either version 2 of the 24 * License, or (at your option) any later version. 25 * 26 * This library is distributed in the hope that it will be useful, 27 * but WITHOUT ANY WARRANTY; without even the implied warranty of 28 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 29 * GNU General Public License for more details. 30 * 31 * You should have received a copy of the GNU General Public 32 * License along with this library; if not, write to the Free 33 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, 34 * MA 02110-1301 USA 35 * 36 * Alternatively, 37 * 38 * b) Redistribution and use in source and binary forms, with or 39 * without modification, are permitted provided that the following 40 * conditions are met: 41 * 42 * 1. Redistributions of source code must retain the above 43 * copyright notice, this list of conditions and the following 44 * disclaimer. 45 * 2. Redistributions in binary form must reproduce the above 46 * copyright notice, this list of conditions and the following 47 * disclaimer in the documentation and/or other materials 48 * provided with the distribution. 49 * 50 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 51 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, 52 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 53 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 54 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 55 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 56 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 57 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 58 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 59 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 60 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 61 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 62 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 63 */ 64 65 #ifndef __ASSEMBLY__ 66 67 #include <errno.h> 68 #include <unistd.h> 69 #include <fcntl.h> 70 71 struct fdt_header { 72 fdt32_t magic; /* magic word FDT_MAGIC */ 73 fdt32_t totalsize; /* total size of DT block */ 74 fdt32_t off_dt_struct; /* offset to structure */ 75 fdt32_t off_dt_strings; /* offset to strings */ 76 fdt32_t off_mem_rsvmap; /* offset to memory reserve map */ 77 fdt32_t version; /* format version */ 78 fdt32_t last_comp_version; /* last compatible version */ 79 80 /* version 2 fields below */ 81 fdt32_t boot_cpuid_phys; /* Which physical CPU id we're 82 booting on */ 83 /* version 3 fields below */ 84 fdt32_t size_dt_strings; /* size of the strings block */ 85 86 /* version 17 fields below */ 87 fdt32_t size_dt_struct; /* size of the structure block */ 88 }; 89 90 struct fdt_reserve_entry { 91 fdt64_t address; 92 fdt64_t size; 93 }; 94 95 struct fdt_node_header { 96 fdt32_t tag; 97 char name[0]; 98 }; 99 100 struct fdt_property { 101 fdt32_t tag; 102 fdt32_t len; 103 fdt32_t nameoff; 104 char data[0]; 105 }; 106 107 #endif /* !__ASSEMBLY */ 108 109 #define FDT_MAGIC 0xd00dfeed /* 4: version, 4: total size */ 110 #define FDT_TAGSIZE sizeof(fdt32_t) 111 112 #define FDT_BEGIN_NODE 0x1 /* Start node: full name */ 113 #define FDT_END_NODE 0x2 /* End node */ 114 #define FDT_PROP 0x3 /* Property: name off, 115 size, content */ 116 #define FDT_NOP 0x4 /* nop */ 117 #define FDT_END 0x9 118 119 #define FDT_V1_SIZE (7*sizeof(fdt32_t)) 120 #define FDT_V2_SIZE (FDT_V1_SIZE + sizeof(fdt32_t)) 121 #define FDT_V3_SIZE (FDT_V2_SIZE + sizeof(fdt32_t)) 122 #define FDT_V16_SIZE FDT_V3_SIZE 123 #define FDT_V17_SIZE (FDT_V16_SIZE + sizeof(fdt32_t)) 124 125 #endif /* _FDT_H */ 126