arch/x86/lib/fsp/fsp_dram.c

   1 /*
   2  * Copyright (C) 2014, Bin Meng <bmeng.cn@gmail.com>
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <common.h>
   8 #include <asm/fsp/fsp_support.h>
   9 #include <asm/e820.h>
  10 #include <asm/post.h>
  11
  12 DECLARE_GLOBAL_DATA_PTR;
  13
  14 int dram_init(void)
  15 {
  16         phys_size_t ram_size = 0;
  17         const struct hob_header *hdr;
  18         struct hob_res_desc *res_desc;
  19
  20         hdr = gd->arch.hob_list;
  21         while (!end_of_hob(hdr)) {
  22                 if (hdr->type == HOB_TYPE_RES_DESC) {
  23                         res_desc = (struct hob_res_desc *)hdr;
  24                         if (res_desc->type == RES_SYS_MEM ||
  25                             res_desc->type == RES_MEM_RESERVED) {
  26                                 ram_size += res_desc->len;
  27                         }
  28                 }
  29                 hdr = get_next_hob(hdr);
  30         }
  31
  32         gd->ram_size = ram_size;
  33         post_code(POST_DRAM);
  34
  35         return 0;
  36 }
  37
  38 void dram_init_banksize(void)
  39 {
  40         gd->bd->bi_dram[0].start = 0;
  41         gd->bd->bi_dram[0].size = gd->ram_size;
  42 }
  43
  44 /*
  45  * This function looks for the highest region of memory lower than 4GB which
  46  * has enough space for U-Boot where U-Boot is aligned on a page boundary.
  47  * It overrides the default implementation found elsewhere which simply
  48  * picks the end of ram, wherever that may be. The location of the stack,
  49  * the relocation address, and how far U-Boot is moved by relocation are
  50  * set in the global data structure.
  51  */
  52 ulong board_get_usable_ram_top(ulong total_size)
  53 {
  54         return fsp_get_usable_lowmem_top(gd->arch.hob_list);
  55 }
  56
  57 unsigned install_e820_map(unsigned max_entries, struct e820entry *entries)
  58 {
  59         unsigned num_entries = 0;
  60         const struct hob_header *hdr;
  61         struct hob_res_desc *res_desc;
  62
  63         hdr = gd->arch.hob_list;
  64
  65         while (!end_of_hob(hdr)) {
  66                 if (hdr->type == HOB_TYPE_RES_DESC) {
  67                         res_desc = (struct hob_res_desc *)hdr;
  68                         entries[num_entries].addr = res_desc->phys_start;
  69                         entries[num_entries].size = res_desc->len;
  70
  71                         if (res_desc->type == RES_SYS_MEM)
  72                                 entries[num_entries].type = E820_RAM;
  73                         else if (res_desc->type == RES_MEM_RESERVED)
  74                                 entries[num_entries].type = E820_RESERVED;
  75                 }
  76                 hdr = get_next_hob(hdr);
  77                 num_entries++;
  78         }
  79
  80         return num_entries;
  81 }