LXR uboot/arch/arm/cpu/arm926ejs/orion5x/dram.c

   1/*
   2 * Copyright (C) 2010 Albert ARIBAUD <albert.aribaud@free.fr>
   3 *
   4 * Based on original Kirkwood support which is
   5 * (C) Copyright 2009
   6 * Marvell Semiconductor <www.marvell.com>
   7 * Written-by: Prafulla Wadaskar <prafulla@marvell.com>
   8 *
   9 * See file CREDITS for list of people who contributed to this
  10 * project.
  11 *
  12 * This program is free software; you can redistribute it and/or
  13 * modify it under the terms of the GNU General Public License as
  14 * published by the Free Software Foundation; either version 2 of
  15 * the License, or (at your option) any later version.
  16 *
  17 * This program is distributed in the hope that it will be useful,
  18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  20 * GNU General Public License for more details.
  21 *
  22 * You should have received a copy of the GNU General Public License
  23 * along with this program; if not, write to the Free Software
  24 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  25 * MA 02110-1301 USA
  26 */
  27
  28#include <common.h>
  29#include <config.h>
  30#include <asm/arch/orion5x.h>
  31
  32DECLARE_GLOBAL_DATA_PTR;
  33
  34/*
  35 * orion5x_sdram_bar - reads SDRAM Base Address Register
  36 */
  37u32 orion5x_sdram_bar(enum memory_bank bank)
  38{
  39        struct orion5x_ddr_addr_decode_registers *winregs =
  40                (struct orion5x_ddr_addr_decode_registers *)
  41                ORION5X_CPU_WIN_BASE;
  42
  43        u32 result = 0;
  44        u32 enable = 0x01 & winregs[bank].size;
  45
  46        if ((!enable) || (bank > BANK3))
  47                return 0;
  48
  49        result = winregs[bank].base;
  50        return result;
  51}
  52int dram_init (void)
  53{
  54        /* dram_init must store complete ramsize in gd->ram_size */
  55        gd->ram_size = get_ram_size(
  56                        (volatile long *) orion5x_sdram_bar(0),
  57                        CONFIG_MAX_RAM_BANK_SIZE);
  58        return 0;
  59}
  60
  61void dram_init_banksize (void)
  62{
  63        int i;
  64
  65        for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
  66                gd->bd->bi_dram[i].start = orion5x_sdram_bar(i);
  67                gd->bd->bi_dram[i].size = get_ram_size(
  68                        (volatile long *) (gd->bd->bi_dram[i].start),
  69                        CONFIG_MAX_RAM_BANK_SIZE);
  70        }
  71}
  72