target/linux/ipq40xx/image/ipq-aux-loader/src/src/include/uimage/fdt.h

   1 /*
   2  * Auxiliary kernel loader for Qualcom IPQ-4XXX/806X based boards
   3  *
   4  * Copyright (C) 2019 Sergey Sergeev <adron@mstnt.com>
   5  *
   6  * Some structures and code has been taken from the U-Boot project.
   7  *      (C) Copyright 2008 Semihalf
   8  *      (C) Copyright 2000-2005
   9  *      Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  10  *
  11  * This program is free software; you can redistribute it and/or modify it
  12  * under the terms of the GNU General Public License version 2 as published
  13  * by the Free Software Foundation.
  14  */
  15
  16 #ifndef _FDT_H
  17 #define _FDT_H
  18
  19 #ifndef __ASSEMBLY__
  20
  21 struct fdt_header {
  22         uint32_t magic;                  /* magic word FDT_MAGIC */
  23         uint32_t totalsize;              /* total size of DT block */
  24         uint32_t off_dt_struct;          /* offset to structure */
  25         uint32_t off_dt_strings;         /* offset to strings */
  26         uint32_t off_mem_rsvmap;         /* offset to memory reserve map */
  27         uint32_t version;                /* format version */
  28         uint32_t last_comp_version;      /* last compatible version */
  29
  30         /* version 2 fields below */
  31         uint32_t boot_cpuid_phys;        /* Which physical CPU id we're
  32                                             booting on */
  33         /* version 3 fields below */
  34         uint32_t size_dt_strings;        /* size of the strings block */
  35
  36         /* version 17 fields below */
  37         uint32_t size_dt_struct;         /* size of the structure block */
  38 };
  39
  40 struct fdt_reserve_entry {
  41         uint64_t address;
  42         uint64_t size;
  43 };
  44
  45 struct fdt_node_header {
  46         uint32_t tag;
  47         char name[0];
  48 };
  49
  50 struct fdt_property {
  51         uint32_t tag;
  52         uint32_t len;
  53         uint32_t nameoff;
  54         char data[0];
  55 };
  56
  57 #endif /* !__ASSEMBLY */
  58
  59 #define FDT_MAGIC       0xd00dfeed      /* 4: version, 4: total size */
  60 #define FDT_TAGSIZE     sizeof(uint32_t)
  61
  62 #define FDT_BEGIN_NODE  0x1             /* Start node: full name */
  63 #define FDT_END_NODE    0x2             /* End node */
  64 #define FDT_PROP        0x3             /* Property: name off,
  65                                            size, content */
  66 #define FDT_NOP         0x4             /* nop */
  67 #define FDT_END         0x9
  68
  69 #define FDT_V1_SIZE     (7*sizeof(uint32_t))
  70 #define FDT_V2_SIZE     (FDT_V1_SIZE + sizeof(uint32_t))
  71 #define FDT_V3_SIZE     (FDT_V2_SIZE + sizeof(uint32_t))
  72 #define FDT_V16_SIZE    FDT_V3_SIZE
  73 #define FDT_V17_SIZE    (FDT_V16_SIZE + sizeof(uint32_t))
  74
  75 /* adding a ramdisk needs 0x44 bytes in version 2008.10 */
  76 #define FDT_RAMDISK_OVERHEAD    0x80
  77 #endif /* _FDT_H */