bootcount_ram.c 1.6 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * (C) Copyright 2010
  4. * Heiko Schocher, DENX Software Engineering, hs@denx.de.
  5. */
  6. #include <common.h>
  7. #include <cpu_func.h>
  8. #include <asm/cache.h>
  9. #include <asm/global_data.h>
  10. #include <asm/io.h>
  11. DECLARE_GLOBAL_DATA_PTR;
  12. const ulong patterns[] = { 0x00000000,
  13. 0xFFFFFFFF,
  14. 0xFF00FF00,
  15. 0x0F0F0F0F,
  16. 0xF0F0F0F0};
  17. const ulong NBR_OF_PATTERNS = sizeof(patterns) / sizeof(*patterns);
  18. const ulong OFFS_PATTERN = 3;
  19. const ulong REPEAT_PATTERN = 1000;
  20. void bootcount_store(ulong a)
  21. {
  22. ulong *save_addr;
  23. ulong size = 0;
  24. int i;
  25. for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++)
  26. size += gd->bd->bi_dram[i].size;
  27. save_addr = (ulong *)(size - BOOTCOUNT_ADDR);
  28. writel(a, save_addr);
  29. writel(CONFIG_SYS_BOOTCOUNT_MAGIC, &save_addr[1]);
  30. for (i = 0; i < REPEAT_PATTERN; i++)
  31. writel(patterns[i % NBR_OF_PATTERNS],
  32. &save_addr[i + OFFS_PATTERN]);
  33. /* Make sure the data is written to RAM */
  34. flush_dcache_range((ulong)&save_addr[0],
  35. (((ulong)&save_addr[REPEAT_PATTERN + OFFS_PATTERN] &
  36. ~(ARCH_DMA_MINALIGN - 1)) + ARCH_DMA_MINALIGN));
  37. }
  38. ulong bootcount_load(void)
  39. {
  40. ulong *save_addr;
  41. ulong size = 0;
  42. ulong counter = 0;
  43. int i, tmp;
  44. for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++)
  45. size += gd->bd->bi_dram[i].size;
  46. save_addr = (ulong *)(size - BOOTCOUNT_ADDR);
  47. counter = readl(&save_addr[0]);
  48. /* Is the counter reliable, check in the big pattern for bit errors */
  49. for (i = 0; (i < REPEAT_PATTERN) && (counter != 0); i++) {
  50. tmp = readl(&save_addr[i + OFFS_PATTERN]);
  51. if (tmp != patterns[i % NBR_OF_PATTERNS])
  52. counter = 0;
  53. }
  54. return counter;
  55. }