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fdt_wip.c 3.6 KB

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  1. /*
  2. * libfdt - Flat Device Tree manipulation
  3. * Copyright (C) 2006 David Gibson, IBM Corporation.
  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 fdt_setprop_inplace(void *fdt, int nodeoffset, const char *name,
  56. const void *val, int len)
  57. {
  58. void *propval;
  59. int proplen;
  60. propval = fdt_getprop_w(fdt, nodeoffset, name, &proplen);
  61. if (! propval)
  62. return proplen;
  63. if (proplen != len)
  64. return -FDT_ERR_NOSPACE;
  65. memcpy(propval, val, len);
  66. return 0;
  67. }
  68. static void _fdt_nop_region(void *start, int len)
  69. {
  70. fdt32_t *p;
  71. for (p = start; (char *)p < ((char *)start + len); p++)
  72. *p = cpu_to_fdt32(FDT_NOP);
  73. }
  74. int fdt_nop_property(void *fdt, int nodeoffset, const char *name)
  75. {
  76. struct fdt_property *prop;
  77. int len;
  78. prop = fdt_get_property_w(fdt, nodeoffset, name, &len);
  79. if (! prop)
  80. return len;
  81. _fdt_nop_region(prop, len + sizeof(*prop));
  82. return 0;
  83. }
  84. int _fdt_node_end_offset(void *fdt, int offset)
  85. {
  86. int depth = 0;
  87. while ((offset >= 0) && (depth >= 0))
  88. offset = fdt_next_node(fdt, offset, &depth);
  89. return offset;
  90. }
  91. int fdt_nop_node(void *fdt, int nodeoffset)
  92. {
  93. int endoffset;
  94. endoffset = _fdt_node_end_offset(fdt, nodeoffset);
  95. if (endoffset < 0)
  96. return endoffset;
  97. _fdt_nop_region(fdt_offset_ptr_w(fdt, nodeoffset, 0),
  98. endoffset - nodeoffset);
  99. return 0;
  100. }