sdram.c 3.1 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128
  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/cb_sysinfo.h>
  11. #include <asm/global_data.h>
  12. DECLARE_GLOBAL_DATA_PTR;
  13. unsigned int install_e820_map(unsigned int max_entries,
  14. struct e820_entry *entries)
  15. {
  16. unsigned int num_entries;
  17. int i;
  18. num_entries = min((unsigned int)lib_sysinfo.n_memranges, max_entries);
  19. if (num_entries < lib_sysinfo.n_memranges) {
  20. printf("Warning: Limiting e820 map to %d entries.\n",
  21. num_entries);
  22. }
  23. for (i = 0; i < num_entries; i++) {
  24. struct memrange *memrange = &lib_sysinfo.memrange[i];
  25. entries[i].addr = memrange->base;
  26. entries[i].size = memrange->size;
  27. /*
  28. * coreboot has some extensions (type 6 & 16) to the E820 types.
  29. * When we detect this, mark it as E820_RESERVED.
  30. */
  31. if (memrange->type == CB_MEM_VENDOR_RSVD ||
  32. memrange->type == CB_MEM_TABLE)
  33. entries[i].type = E820_RESERVED;
  34. else
  35. entries[i].type = memrange->type;
  36. }
  37. return num_entries;
  38. }
  39. /*
  40. * This function looks for the highest region of memory lower than 4GB which
  41. * has enough space for U-Boot where U-Boot is aligned on a page boundary. It
  42. * overrides the default implementation found elsewhere which simply picks the
  43. * end of ram, wherever that may be. The location of the stack, the relocation
  44. * address, and how far U-Boot is moved by relocation are set in the global
  45. * data structure.
  46. */
  47. ulong board_get_usable_ram_top(ulong total_size)
  48. {
  49. uintptr_t dest_addr = 0;
  50. int i;
  51. for (i = 0; i < lib_sysinfo.n_memranges; i++) {
  52. struct memrange *memrange = &lib_sysinfo.memrange[i];
  53. /* Force U-Boot to relocate to a page aligned address. */
  54. uint64_t start = roundup(memrange->base, 1 << 12);
  55. uint64_t end = memrange->base + memrange->size;
  56. /* Ignore non-memory regions. */
  57. if (memrange->type != CB_MEM_RAM)
  58. continue;
  59. /* Filter memory over 4GB. */
  60. if (end > 0xffffffffULL)
  61. end = 0x100000000ULL;
  62. /* Skip this region if it's too small. */
  63. if (end - start < total_size)
  64. continue;
  65. /* Use this address if it's the largest so far. */
  66. if (end > dest_addr)
  67. dest_addr = end;
  68. }
  69. /* If no suitable area was found, return an error. */
  70. if (!dest_addr)
  71. panic("No available memory found for relocation");
  72. return (ulong)dest_addr;
  73. }
  74. int dram_init(void)
  75. {
  76. int i;
  77. phys_size_t ram_size = 0;
  78. for (i = 0; i < lib_sysinfo.n_memranges; i++) {
  79. struct memrange *memrange = &lib_sysinfo.memrange[i];
  80. unsigned long long end = memrange->base + memrange->size;
  81. if (memrange->type == CB_MEM_RAM && end > ram_size)
  82. ram_size += memrange->size;
  83. }
  84. gd->ram_size = ram_size;
  85. if (ram_size == 0)
  86. return -1;
  87. return 0;
  88. }
  89. int dram_init_banksize(void)
  90. {
  91. int i, j;
  92. if (CONFIG_NR_DRAM_BANKS) {
  93. for (i = 0, j = 0; i < lib_sysinfo.n_memranges; i++) {
  94. struct memrange *memrange = &lib_sysinfo.memrange[i];
  95. if (memrange->type == CB_MEM_RAM) {
  96. gd->bd->bi_dram[j].start = memrange->base;
  97. gd->bd->bi_dram[j].size = memrange->size;
  98. j++;
  99. if (j >= CONFIG_NR_DRAM_BANKS)
  100. break;
  101. }
  102. }
  103. }
  104. return 0;
  105. }