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  * See file CREDITS for list of people who contributed to this
   7  * project.
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License as
  11  * published by the Free Software Foundation; either version 2 of
  12  * the License, or (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but without any warranty; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  22  * MA 02111-1307 USA
  23  */
  24
  25 #include <common.h>
  26 #include <malloc.h>
  27 #include <asm/e820.h>
  28 #include <asm/u-boot-x86.h>
  29 #include <asm/global_data.h>
  30 #include <asm/processor.h>
  31 #include <asm/arch/sysinfo.h>
  32 #include <asm/arch/tables.h>
  33
  34 DECLARE_GLOBAL_DATA_PTR;
  35
  36 unsigned install_e820_map(unsigned max_entries, struct e820entry *entries)
  37 {
  38         int i;
  39
  40         unsigned num_entries = min(lib_sysinfo.n_memranges, max_entries);
  41         if (num_entries < lib_sysinfo.n_memranges) {
  42                 printf("Warning: Limiting e820 map to %d entries.\n",
  43                         num_entries);
  44         }
  45         for (i = 0; i < num_entries; i++) {
  46                 struct memrange *memrange = &lib_sysinfo.memrange[i];
  47
  48                 entries[i].addr = memrange->base;
  49                 entries[i].size = memrange->size;
  50                 entries[i].type = memrange->type;
  51         }
  52         return num_entries;
  53 }
  54
  55 /*
  56  * This function looks for the highest region of memory lower than 4GB which
  57  * has enough space for U-Boot where U-Boot is aligned on a page boundary. It
  58  * overrides the default implementation found elsewhere which simply picks the
  59  * end of ram, wherever that may be. The location of the stack, the relocation
  60  * address, and how far U-Boot is moved by relocation are set in the global
  61  * data structure.
  62  */
  63 ulong board_get_usable_ram_top(ulong total_size)
  64 {
  65         uintptr_t dest_addr = 0;
  66         int i;
  67
  68         for (i = 0; i < lib_sysinfo.n_memranges; i++) {
  69                 struct memrange *memrange = &lib_sysinfo.memrange[i];
  70                 /* Force U-Boot to relocate to a page aligned address. */
  71                 uint64_t start = roundup(memrange->base, 1 << 12);
  72                 uint64_t end = memrange->base + memrange->size;
  73
  74                 /* Ignore non-memory regions. */
  75                 if (memrange->type != CB_MEM_RAM)
  76                         continue;
  77
  78                 /* Filter memory over 4GB. */
  79                 if (end > 0xffffffffULL)
  80                         end = 0x100000000ULL;
  81                 /* Skip this region if it's too small. */
  82                 if (end - start < total_size)
  83                         continue;
  84
  85                 /* Use this address if it's the largest so far. */
  86                 if (end > dest_addr)
  87                         dest_addr = end;
  88         }
  89
  90         /* If no suitable area was found, return an error. */
  91         if (!dest_addr)
  92                 panic("No available memory found for relocation");
  93
  94         return (ulong)dest_addr;
  95 }
  96
  97 int dram_init_f(void)
  98 {
  99         int i;
 100         phys_size_t ram_size = 0;
 101
 102         for (i = 0; i < lib_sysinfo.n_memranges; i++) {
 103                 struct memrange *memrange = &lib_sysinfo.memrange[i];
 104                 unsigned long long end = memrange->base + memrange->size;
 105
 106                 if (memrange->type == CB_MEM_RAM && end > ram_size)
 107                         ram_size = end;
 108         }
 109         gd->ram_size = ram_size;
 110         if (ram_size == 0)
 111                 return -1;
 112         return 0;
 113 }
 114
 115 int dram_init(void)
 116 {
 117         int i, j;
 118
 119         if (CONFIG_NR_DRAM_BANKS) {
 120                 for (i = 0, j = 0; i < lib_sysinfo.n_memranges; i++) {
 121                         struct memrange *memrange = &lib_sysinfo.memrange[i];
 122
 123                         if (memrange->type == CB_MEM_RAM) {
 124                                 gd->bd->bi_dram[j].start = memrange->base;
 125                                 gd->bd->bi_dram[j].size = memrange->size;
 126                                 j++;
 127                                 if (j >= CONFIG_NR_DRAM_BANKS)
 128                                         break;
 129                         }
 130                 }
 131         }
 132         return 0;
 133 }