dram_init.c 1.5 KB

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  1. // SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
  2. /*
  3. * Copyright (C) 2018, STMicroelectronics - All Rights Reserved
  4. */
  5. #define LOG_CATEGORY LOGC_ARCH
  6. #include <common.h>
  7. #include <dm.h>
  8. #include <image.h>
  9. #include <init.h>
  10. #include <lmb.h>
  11. #include <log.h>
  12. #include <ram.h>
  13. #include <asm/global_data.h>
  14. #include <asm/system.h>
  15. DECLARE_GLOBAL_DATA_PTR;
  16. int dram_init(void)
  17. {
  18. struct ram_info ram;
  19. struct udevice *dev;
  20. int ret;
  21. ret = uclass_get_device(UCLASS_RAM, 0, &dev);
  22. if (ret) {
  23. log_debug("RAM init failed: %d\n", ret);
  24. return ret;
  25. }
  26. ret = ram_get_info(dev, &ram);
  27. if (ret) {
  28. log_debug("Cannot get RAM size: %d\n", ret);
  29. return ret;
  30. }
  31. log_debug("RAM init base=%lx, size=%x\n", ram.base, ram.size);
  32. gd->ram_size = ram.size;
  33. return 0;
  34. }
  35. ulong board_get_usable_ram_top(ulong total_size)
  36. {
  37. phys_size_t size;
  38. phys_addr_t reg;
  39. struct lmb lmb;
  40. if (!total_size)
  41. return gd->ram_top;
  42. /* found enough not-reserved memory to relocated U-Boot */
  43. lmb_init(&lmb);
  44. lmb_add(&lmb, gd->ram_base, gd->ram_size);
  45. boot_fdt_add_mem_rsv_regions(&lmb, (void *)gd->fdt_blob);
  46. /* add 8M for reserved memory for display, fdt, gd,... */
  47. size = ALIGN(SZ_8M + CONFIG_SYS_MALLOC_LEN + total_size, MMU_SECTION_SIZE),
  48. reg = lmb_alloc(&lmb, size, MMU_SECTION_SIZE);
  49. if (!reg)
  50. reg = gd->ram_top - size;
  51. /* before relocation, mark the U-Boot memory as cacheable by default */
  52. if (!(gd->flags & GD_FLG_RELOC))
  53. mmu_set_region_dcache_behaviour(reg, size, DCACHE_DEFAULT_OPTION);
  54. return reg + size;
  55. }