sdram.c 3.1 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * Copyright (c) 2011 The Chromium OS Authors.
  4. * (C) Copyright 2010,2011
  5. * Graeme Russ, <graeme.russ@gmail.com>
  6. */
  7. #include <common.h>
  8. #include <init.h>
  9. #include <asm/e820.h>
  10. #include <asm/arch/sysinfo.h>
  11. DECLARE_GLOBAL_DATA_PTR;
  12. unsigned int install_e820_map(unsigned int max_entries,
  13. struct e820_entry *entries)
  14. {
  15. unsigned int num_entries;
  16. int i;
  17. num_entries = min((unsigned int)lib_sysinfo.n_memranges, max_entries);
  18. if (num_entries < lib_sysinfo.n_memranges) {
  19. printf("Warning: Limiting e820 map to %d entries.\n",
  20. num_entries);
  21. }
  22. for (i = 0; i < num_entries; i++) {
  23. struct memrange *memrange = &lib_sysinfo.memrange[i];
  24. entries[i].addr = memrange->base;
  25. entries[i].size = memrange->size;
  26. /*
  27. * coreboot has some extensions (type 6 & 16) to the E820 types.
  28. * When we detect this, mark it as E820_RESERVED.
  29. */
  30. if (memrange->type == CB_MEM_VENDOR_RSVD ||
  31. memrange->type == CB_MEM_TABLE)
  32. entries[i].type = E820_RESERVED;
  33. else
  34. entries[i].type = memrange->type;
  35. }
  36. return num_entries;
  37. }
  38. /*
  39. * This function looks for the highest region of memory lower than 4GB which
  40. * has enough space for U-Boot where U-Boot is aligned on a page boundary. It
  41. * overrides the default implementation found elsewhere which simply picks the
  42. * end of ram, wherever that may be. The location of the stack, the relocation
  43. * address, and how far U-Boot is moved by relocation are set in the global
  44. * data structure.
  45. */
  46. ulong board_get_usable_ram_top(ulong total_size)
  47. {
  48. uintptr_t dest_addr = 0;
  49. int i;
  50. for (i = 0; i < lib_sysinfo.n_memranges; i++) {
  51. struct memrange *memrange = &lib_sysinfo.memrange[i];
  52. /* Force U-Boot to relocate to a page aligned address. */
  53. uint64_t start = roundup(memrange->base, 1 << 12);
  54. uint64_t end = memrange->base + memrange->size;
  55. /* Ignore non-memory regions. */
  56. if (memrange->type != CB_MEM_RAM)
  57. continue;
  58. /* Filter memory over 4GB. */
  59. if (end > 0xffffffffULL)
  60. end = 0x100000000ULL;
  61. /* Skip this region if it's too small. */
  62. if (end - start < total_size)
  63. continue;
  64. /* Use this address if it's the largest so far. */
  65. if (end > dest_addr)
  66. dest_addr = end;
  67. }
  68. /* If no suitable area was found, return an error. */
  69. if (!dest_addr)
  70. panic("No available memory found for relocation");
  71. return (ulong)dest_addr;
  72. }
  73. int dram_init(void)
  74. {
  75. int i;
  76. phys_size_t ram_size = 0;
  77. for (i = 0; i < lib_sysinfo.n_memranges; i++) {
  78. struct memrange *memrange = &lib_sysinfo.memrange[i];
  79. unsigned long long end = memrange->base + memrange->size;
  80. if (memrange->type == CB_MEM_RAM && end > ram_size)
  81. ram_size += memrange->size;
  82. }
  83. gd->ram_size = ram_size;
  84. if (ram_size == 0)
  85. return -1;
  86. return 0;
  87. }
  88. int dram_init_banksize(void)
  89. {
  90. int i, j;
  91. if (CONFIG_NR_DRAM_BANKS) {
  92. for (i = 0, j = 0; i < lib_sysinfo.n_memranges; i++) {
  93. struct memrange *memrange = &lib_sysinfo.memrange[i];
  94. if (memrange->type == CB_MEM_RAM) {
  95. gd->bd->bi_dram[j].start = memrange->base;
  96. gd->bd->bi_dram[j].size = memrange->size;
  97. j++;
  98. if (j >= CONFIG_NR_DRAM_BANKS)
  99. break;
  100. }
  101. }
  102. }
  103. return 0;
  104. }