fdt_addresses.c 3.4 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110
  1. /*
  2. * libfdt - Flat Device Tree manipulation
  3. * Copyright (C) 2014 David Gibson <david@gibson.dropbear.id.au>
  4. *
  5. * libfdt is dual licensed: you can use it either under the terms of
  6. * the GPL, or the BSD license, at your option.
  7. *
  8. * a) This library is free software; you can redistribute it and/or
  9. * modify it under the terms of the GNU General Public License as
  10. * published by the Free Software Foundation; either version 2 of the
  11. * License, or (at your option) any later version.
  12. *
  13. * This library is distributed in the hope that it will be useful,
  14. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16. * GNU General Public License for more details.
  17. *
  18. * You should have received a copy of the GNU General Public
  19. * License along with this library; if not, write to the Free
  20. * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
  21. * MA 02110-1301 USA
  22. *
  23. * Alternatively,
  24. *
  25. * b) Redistribution and use in source and binary forms, with or
  26. * without modification, are permitted provided that the following
  27. * conditions are met:
  28. *
  29. * 1. Redistributions of source code must retain the above
  30. * copyright notice, this list of conditions and the following
  31. * disclaimer.
  32. * 2. Redistributions in binary form must reproduce the above
  33. * copyright notice, this list of conditions and the following
  34. * disclaimer in the documentation and/or other materials
  35. * provided with the distribution.
  36. *
  37. * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
  38. * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
  39. * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  40. * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  41. * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  42. * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  43. * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  44. * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  45. * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  46. * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  47. * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  48. * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
  49. * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  50. */
  51. #include "libfdt_env.h"
  52. #include <fdt.h>
  53. #include <libfdt.h>
  54. #include "libfdt_internal.h"
  55. int
  56. fdt_address_cells (
  57. const void *fdt,
  58. int nodeoffset
  59. )
  60. {
  61. const fdt32_t *ac;
  62. int val;
  63. int len;
  64. ac = fdt_getprop (fdt, nodeoffset, "#address-cells", &len);
  65. if (!ac) {
  66. return 2;
  67. }
  68. if (len != sizeof (*ac)) {
  69. return -FDT_ERR_BADNCELLS;
  70. }
  71. val = fdt32_to_cpu (*ac);
  72. if ((val <= 0) || (val > FDT_MAX_NCELLS)) {
  73. return -FDT_ERR_BADNCELLS;
  74. }
  75. return val;
  76. }
  77. int
  78. fdt_size_cells (
  79. const void *fdt,
  80. int nodeoffset
  81. )
  82. {
  83. const fdt32_t *sc;
  84. int val;
  85. int len;
  86. sc = fdt_getprop (fdt, nodeoffset, "#size-cells", &len);
  87. if (!sc) {
  88. return 2;
  89. }
  90. if (len != sizeof (*sc)) {
  91. return -FDT_ERR_BADNCELLS;
  92. }
  93. val = fdt32_to_cpu (*sc);
  94. if ((val < 0) || (val > FDT_MAX_NCELLS)) {
  95. return -FDT_ERR_BADNCELLS;
  96. }
  97. return val;
  98. }