of_extra.c 3.2 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * Copyright (c) 2017 Google, Inc
  4. * Written by Simon Glass <sjg@chromium.org>
  5. */
  6. #include <common.h>
  7. #include <log.h>
  8. #include <linux/libfdt.h>
  9. #include <dm/of_access.h>
  10. #include <dm/of_extra.h>
  11. #include <dm/ofnode.h>
  12. int ofnode_read_fmap_entry(ofnode node, struct fmap_entry *entry)
  13. {
  14. const char *prop;
  15. if (ofnode_read_u32(node, "image-pos", &entry->offset)) {
  16. debug("Node '%s' has bad/missing 'image-pos' property\n",
  17. ofnode_get_name(node));
  18. return log_ret(-ENOENT);
  19. }
  20. if (ofnode_read_u32(node, "size", &entry->length)) {
  21. debug("Node '%s' has bad/missing 'size' property\n",
  22. ofnode_get_name(node));
  23. return log_ret(-ENOENT);
  24. }
  25. entry->used = ofnode_read_s32_default(node, "used", entry->length);
  26. prop = ofnode_read_string(node, "compress");
  27. if (prop) {
  28. if (!strcmp(prop, "lz4"))
  29. entry->compress_algo = FMAP_COMPRESS_LZ4;
  30. else
  31. return log_msg_ret("Unknown compression algo",
  32. -EINVAL);
  33. } else {
  34. entry->compress_algo = FMAP_COMPRESS_NONE;
  35. }
  36. entry->unc_length = ofnode_read_s32_default(node, "uncomp-size",
  37. entry->length);
  38. prop = ofnode_read_string(node, "hash");
  39. if (prop)
  40. entry->hash_size = strlen(prop);
  41. entry->hash_algo = prop ? FMAP_HASH_SHA256 : FMAP_HASH_NONE;
  42. entry->hash = (uint8_t *)prop;
  43. return 0;
  44. }
  45. int ofnode_decode_region(ofnode node, const char *prop_name, fdt_addr_t *basep,
  46. fdt_size_t *sizep)
  47. {
  48. const fdt_addr_t *cell;
  49. int len;
  50. debug("%s: %s: %s\n", __func__, ofnode_get_name(node), prop_name);
  51. cell = ofnode_get_property(node, prop_name, &len);
  52. if (!cell || (len < sizeof(fdt_addr_t) * 2)) {
  53. debug("cell=%p, len=%d\n", cell, len);
  54. return -1;
  55. }
  56. *basep = fdt_addr_to_cpu(*cell);
  57. *sizep = fdt_size_to_cpu(cell[1]);
  58. debug("%s: base=%08lx, size=%lx\n", __func__, (ulong)*basep,
  59. (ulong)*sizep);
  60. return 0;
  61. }
  62. int ofnode_decode_memory_region(ofnode config_node, const char *mem_type,
  63. const char *suffix, fdt_addr_t *basep,
  64. fdt_size_t *sizep)
  65. {
  66. char prop_name[50];
  67. const char *mem;
  68. fdt_size_t size, offset_size;
  69. fdt_addr_t base, offset;
  70. ofnode node;
  71. if (!ofnode_valid(config_node)) {
  72. config_node = ofnode_path("/config");
  73. if (!ofnode_valid(config_node)) {
  74. debug("%s: Cannot find /config node\n", __func__);
  75. return -ENOENT;
  76. }
  77. }
  78. if (!suffix)
  79. suffix = "";
  80. snprintf(prop_name, sizeof(prop_name), "%s-memory%s", mem_type,
  81. suffix);
  82. mem = ofnode_read_string(config_node, prop_name);
  83. if (!mem) {
  84. debug("%s: No memory type for '%s', using /memory\n", __func__,
  85. prop_name);
  86. mem = "/memory";
  87. }
  88. node = ofnode_path(mem);
  89. if (!ofnode_valid(node)) {
  90. debug("%s: Failed to find node '%s'\n", __func__, mem);
  91. return -ENOENT;
  92. }
  93. /*
  94. * Not strictly correct - the memory may have multiple banks. We just
  95. * use the first
  96. */
  97. if (ofnode_decode_region(node, "reg", &base, &size)) {
  98. debug("%s: Failed to decode memory region %s\n", __func__,
  99. mem);
  100. return -EINVAL;
  101. }
  102. snprintf(prop_name, sizeof(prop_name), "%s-offset%s", mem_type,
  103. suffix);
  104. if (ofnode_decode_region(config_node, prop_name, &offset,
  105. &offset_size)) {
  106. debug("%s: Failed to decode memory region '%s'\n", __func__,
  107. prop_name);
  108. return -EINVAL;
  109. }
  110. *basep = base + offset;
  111. *sizep = offset_size;
  112. return 0;
  113. }