board/freescale/m52277evb/m52277evb.c

   1 /*
   2  * (C) Copyright 2000-2003
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * Copyright (C) 2004-2007 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 <asm/immap.h>
  29
  30 DECLARE_GLOBAL_DATA_PTR;
  31
  32 int checkboard(void)
  33 {
  34         puts("Board: ");
  35         puts("Freescale M52277 EVB\n");
  36         return 0;
  37 };
  38
  39 phys_size_t initdram(int board_type)
  40 {
  41         u32 dramsize;
  42
  43 #ifdef CONFIG_CF_SBF
  44         /*
  45          * Serial Boot: The dram is already initialized in start.S
  46          * only require to return DRAM size
  47          */
  48         dramsize = CONFIG_SYS_SDRAM_SIZE * 0x100000;
  49 #else
  50         volatile sdramc_t *sdram = (volatile sdramc_t *)(MMAP_SDRAM);
  51         volatile gpio_t *gpio = (volatile gpio_t *)(MMAP_GPIO);
  52         u32 i;
  53
  54         dramsize = CONFIG_SYS_SDRAM_SIZE * 0x100000;
  55
  56         for (i = 0x13; i < 0x20; i++) {
  57                 if (dramsize == (1 << i))
  58                         break;
  59         }
  60         i--;
  61
  62         gpio->mscr_sdram = CONFIG_SYS_SDRAM_DRV_STRENGTH;
  63
  64         sdram->sdcs0 = (CONFIG_SYS_SDRAM_BASE | i);
  65
  66         sdram->sdcfg1 = CONFIG_SYS_SDRAM_CFG1;
  67         sdram->sdcfg2 = CONFIG_SYS_SDRAM_CFG2;
  68
  69         /* Issue PALL */
  70         sdram->sdcr = CONFIG_SYS_SDRAM_CTRL | 2;
  71         __asm__("nop");
  72
  73         /* Issue LEMR */
  74         sdram->sdmr = CONFIG_SYS_SDRAM_MODE;
  75         __asm__("nop");
  76         sdram->sdmr = CONFIG_SYS_SDRAM_EMOD;
  77         __asm__("nop");
  78
  79         udelay(1000);
  80
  81         /* Issue PALL */
  82         sdram->sdcr = CONFIG_SYS_SDRAM_CTRL | 2;
  83         __asm__("nop");
  84
  85         /* Perform two refresh cycles */
  86         sdram->sdcr = CONFIG_SYS_SDRAM_CTRL | 4;
  87         __asm__("nop");
  88         sdram->sdcr = CONFIG_SYS_SDRAM_CTRL | 4;
  89         __asm__("nop");
  90
  91         sdram->sdcr = (CONFIG_SYS_SDRAM_CTRL & ~0x80000000) | 0x10000C00;
  92
  93         udelay(100);
  94 #endif
  95         return (dramsize);
  96 };
  97
  98 int testdram(void)
  99 {
 100         /* TODO: XXX XXX XXX */
 101         printf("DRAM test not implemented!\n");
 102
 103         return (0);
 104 }