arch/x86/cpu/coreboot/sdram.c

   1 /*
   2  * Copyright (c) 2011 The Chromium OS Authors.
   3  * (C) Copyright 2010,2011
   4  * Graeme Russ, <graeme.russ@gmail.com>
   5  *
   6  * SPDX-License-Identifier:     GPL-2.0+
   7  */
   8
   9 #include <common.h>
  10 #include <asm/e820.h>
  11 #include <asm/arch/sysinfo.h>
  12
  13 DECLARE_GLOBAL_DATA_PTR;
  14
  15 unsigned install_e820_map(unsigned max_entries, struct e820entry *entries)
  16 {
  17         unsigned num_entries;
  18         int i;
  19
  20         num_entries = min((unsigned)lib_sysinfo.n_memranges, max_entries);
  21         if (num_entries < lib_sysinfo.n_memranges) {
  22                 printf("Warning: Limiting e820 map to %d entries.\n",
  23                         num_entries);
  24         }
  25         for (i = 0; i < num_entries; i++) {
  26                 struct memrange *memrange = &lib_sysinfo.memrange[i];
  27
  28                 entries[i].addr = memrange->base;
  29                 entries[i].size = memrange->size;
  30
  31                 /*
  32                  * coreboot has some extensions (type 6 & 16) to the E820 types.
  33                  * When we detect this, mark it as E820_RESERVED.
  34                  */
  35                 if (memrange->type == CB_MEM_VENDOR_RSVD ||
  36                     memrange->type == CB_MEM_TABLE)
  37                         entries[i].type = E820_RESERVED;
  38                 else
  39                         entries[i].type = memrange->type;
  40         }
  41
  42         return num_entries;
  43 }
  44
  45 /*
  46  * This function looks for the highest region of memory lower than 4GB which
  47  * has enough space for U-Boot where U-Boot is aligned on a page boundary. It
  48  * overrides the default implementation found elsewhere which simply picks the
  49  * end of ram, wherever that may be. The location of the stack, the relocation
  50  * address, and how far U-Boot is moved by relocation are set in the global
  51  * data structure.
  52  */
  53 ulong board_get_usable_ram_top(ulong total_size)
  54 {
  55         uintptr_t dest_addr = 0;
  56         int i;
  57
  58         for (i = 0; i < lib_sysinfo.n_memranges; i++) {
  59                 struct memrange *memrange = &lib_sysinfo.memrange[i];
  60                 /* Force U-Boot to relocate to a page aligned address. */
  61                 uint64_t start = roundup(memrange->base, 1 << 12);
  62                 uint64_t end = memrange->base + memrange->size;
  63
  64                 /* Ignore non-memory regions. */
  65                 if (memrange->type != CB_MEM_RAM)
  66                         continue;
  67
  68                 /* Filter memory over 4GB. */
  69                 if (end > 0xffffffffULL)
  70                         end = 0x100000000ULL;
  71                 /* Skip this region if it's too small. */
  72                 if (end - start < total_size)
  73                         continue;
  74
  75                 /* Use this address if it's the largest so far. */
  76                 if (end > dest_addr)
  77                         dest_addr = end;
  78         }
  79
  80         /* If no suitable area was found, return an error. */
  81         if (!dest_addr)
  82                 panic("No available memory found for relocation");
  83
  84         return (ulong)dest_addr;
  85 }
  86
  87 int dram_init(void)
  88 {
  89         int i;
  90         phys_size_t ram_size = 0;
  91
  92         for (i = 0; i < lib_sysinfo.n_memranges; i++) {
  93                 struct memrange *memrange = &lib_sysinfo.memrange[i];
  94                 unsigned long long end = memrange->base + memrange->size;
  95
  96                 if (memrange->type == CB_MEM_RAM && end > ram_size)
  97                         ram_size += memrange->size;
  98         }
  99
 100         gd->ram_size = ram_size;
 101         if (ram_size == 0)
 102                 return -1;
 103
 104         return 0;
 105 }
 106
 107 int dram_init_banksize(void)
 108 {
 109         int i, j;
 110
 111         if (CONFIG_NR_DRAM_BANKS) {
 112                 for (i = 0, j = 0; i < lib_sysinfo.n_memranges; i++) {
 113                         struct memrange *memrange = &lib_sysinfo.memrange[i];
 114
 115                         if (memrange->type == CB_MEM_RAM) {
 116                                 gd->bd->bi_dram[j].start = memrange->base;
 117                                 gd->bd->bi_dram[j].size = memrange->size;
 118                                 j++;
 119                                 if (j >= CONFIG_NR_DRAM_BANKS)
 120                                         break;
 121                         }
 122                 }
 123         }
 124
 125         return 0;
 126 }