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, 2012 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 #include <asm/io.h>
  30
  31 DECLARE_GLOBAL_DATA_PTR;
  32
  33 int checkboard(void)
  34 {
  35         puts("Board: ");
  36         puts("Freescale M52277 EVB\n");
  37         return 0;
  38 };
  39
  40 phys_size_t initdram(int board_type)
  41 {
  42         u32 dramsize;
  43
  44 #ifdef CONFIG_CF_SBF
  45         /*
  46          * Serial Boot: The dram is already initialized in start.S
  47          * only require to return DRAM size
  48          */
  49         dramsize = CONFIG_SYS_SDRAM_SIZE * 0x100000;
  50 #else
  51         sdramc_t *sdram = (sdramc_t *)(MMAP_SDRAM);
  52         gpio_t *gpio = (gpio_t *)(MMAP_GPIO);
  53         u32 i;
  54
  55         dramsize = CONFIG_SYS_SDRAM_SIZE * 0x100000;
  56
  57         for (i = 0x13; i < 0x20; i++) {
  58                 if (dramsize == (1 << i))
  59                         break;
  60         }
  61         i--;
  62
  63         out_8(&gpio->mscr_sdram, CONFIG_SYS_SDRAM_DRV_STRENGTH);
  64
  65         out_be32(&sdram->sdcs0, CONFIG_SYS_SDRAM_BASE | i);
  66
  67         out_be32(&sdram->sdcfg1, CONFIG_SYS_SDRAM_CFG1);
  68         out_be32(&sdram->sdcfg2, CONFIG_SYS_SDRAM_CFG2);
  69
  70         /* Issue PALL */
  71         out_be32(&sdram->sdcr, CONFIG_SYS_SDRAM_CTRL | 2);
  72         __asm__("nop");
  73
  74         /* Issue LEMR */
  75         out_be32(&sdram->sdmr, CONFIG_SYS_SDRAM_MODE);
  76         __asm__("nop");
  77         out_be32(&sdram->sdmr, CONFIG_SYS_SDRAM_EMOD);
  78         __asm__("nop");
  79
  80         udelay(1000);
  81
  82         /* Issue PALL */
  83         out_be32(&sdram->sdcr, CONFIG_SYS_SDRAM_CTRL | 2);
  84         __asm__("nop");
  85
  86         /* Perform two refresh cycles */
  87         out_be32(&sdram->sdcr, CONFIG_SYS_SDRAM_CTRL | 4);
  88         __asm__("nop");
  89         out_be32(&sdram->sdcr, CONFIG_SYS_SDRAM_CTRL | 4);
  90         __asm__("nop");
  91
  92         out_be32(&sdram->sdcr,
  93                 (CONFIG_SYS_SDRAM_CTRL & ~0x80000000) | 0x10000c00);
  94
  95         udelay(100);
  96 #endif
  97         return (dramsize);
  98 };
  99
 100 int testdram(void)
 101 {
 102         /* TODO: XXX XXX XXX */
 103         printf("DRAM test not implemented!\n");
 104
 105         return (0);
 106 }