LXR uboot/board/freescale/m54451evb/m54451evb.c

   1/*
   2 * (C) Copyright 2000-2003
   3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4 *
   5 * Copyright (C) 2004-2008 Freescale Semiconductor, Inc.
   6 * TsiChung Liew (Tsi-Chung.Liew@freescale.com)
   7 *
   8 * See file CREDITS for list of people who contributed to this
   9 * project.
  10 *
  11 * This program is free software; you can redistribute it and/or
  12 * modify it under the terms of the GNU General Public License as
  13 * published by the Free Software Foundation; either version 2 of
  14 * the License, or (at your option) any later version.
  15 *
  16 * This program is distributed in the hope that it will be useful,
  17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 * GNU General Public License for more details.
  20 *
  21 * You should have received a copy of the GNU General Public License
  22 * along with this program; if not, write to the Free Software
  23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  24 * MA 02111-1307 USA
  25 */
  26
  27#include <common.h>
  28#include <spi.h>
  29#include <asm/immap.h>
  30
  31DECLARE_GLOBAL_DATA_PTR;
  32
  33int checkboard(void)
  34{
  35        /*
  36         * need to to:
  37         * Check serial flash size. if 2mb evb, else 8mb demo
  38         */
  39        puts("Board: ");
  40        puts("Freescale M54451 EVB\n");
  41        return 0;
  42};
  43
  44phys_size_t initdram(int board_type)
  45{
  46        u32 dramsize;
  47#ifdef CONFIG_CF_SBF
  48        /*
  49         * Serial Boot: The dram is already initialized in start.S
  50         * only require to return DRAM size
  51         */
  52        dramsize = CONFIG_SYS_SDRAM_SIZE * 0x100000;
  53#else
  54        volatile sdramc_t *sdram = (volatile sdramc_t *)(MMAP_SDRAM);
  55        volatile gpio_t *gpio = (volatile gpio_t *)(MMAP_GPIO);
  56        u32 i;
  57
  58        dramsize = CONFIG_SYS_SDRAM_SIZE * 0x100000;
  59
  60        if ((sdram->sdcfg1 == CONFIG_SYS_SDRAM_CFG1) &&
  61            (sdram->sdcfg2 == CONFIG_SYS_SDRAM_CFG2))
  62                return dramsize;
  63
  64        for (i = 0x13; i < 0x20; i++) {
  65                if (dramsize == (1 << i))
  66                        break;
  67        }
  68        i--;
  69
  70        gpio->mscr_sdram = CONFIG_SYS_SDRAM_DRV_STRENGTH;
  71
  72        sdram->sdcs0 = (CONFIG_SYS_SDRAM_BASE | i);
  73
  74        sdram->sdcfg1 = CONFIG_SYS_SDRAM_CFG1;
  75        sdram->sdcfg2 = CONFIG_SYS_SDRAM_CFG2;
  76
  77        udelay(200);
  78
  79        /* Issue PALL */
  80        sdram->sdcr = CONFIG_SYS_SDRAM_CTRL | 2;
  81        __asm__("nop");
  82
  83        /* Perform two refresh cycles */
  84        sdram->sdcr = CONFIG_SYS_SDRAM_CTRL | 4;
  85        __asm__("nop");
  86        sdram->sdcr = CONFIG_SYS_SDRAM_CTRL | 4;
  87        __asm__("nop");
  88
  89        /* Issue LEMR */
  90        sdram->sdmr = CONFIG_SYS_SDRAM_MODE;
  91        __asm__("nop");
  92        sdram->sdmr = CONFIG_SYS_SDRAM_EMOD;
  93        __asm__("nop");
  94
  95        sdram->sdcr = (CONFIG_SYS_SDRAM_CTRL & ~0x80000000) | 0x10000000;
  96
  97        udelay(100);
  98#endif
  99        return (dramsize);
 100};
 101
 102int testdram(void)
 103{
 104        /* TODO: XXX XXX XXX */
 105        printf("DRAM test not implemented!\n");
 106
 107        return (0);
 108}
 109