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
  31 DECLARE_GLOBAL_DATA_PTR;
  32
  33 int 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
  44 phys_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
 102 int testdram(void)
 103 {
 104         /* TODO: XXX XXX XXX */
 105         printf("DRAM test not implemented!\n");
 106
 107         return (0);
 108 }