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, 2012 Freescale Semiconductor, Inc.
   6  * TsiChung Liew (Tsi-Chung.Liew@freescale.com)
   7  *
   8  * SPDX-License-Identifier:     GPL-2.0+
   9  */
  10
  11 #include <common.h>
  12 #include <spi.h>
  13 #include <asm/immap.h>
  14 #include <asm/io.h>
  15
  16 DECLARE_GLOBAL_DATA_PTR;
  17
  18 int checkboard(void)
  19 {
  20         /*
  21          * need to to:
  22          * Check serial flash size. if 2mb evb, else 8mb demo
  23          */
  24         puts("Board: ");
  25         puts("Freescale M54451 EVB\n");
  26         return 0;
  27 };
  28
  29 phys_size_t initdram(int board_type)
  30 {
  31         u32 dramsize;
  32 #ifdef CONFIG_CF_SBF
  33         /*
  34          * Serial Boot: The dram is already initialized in start.S
  35          * only require to return DRAM size
  36          */
  37         dramsize = CONFIG_SYS_SDRAM_SIZE * 0x100000;
  38 #else
  39         sdramc_t *sdram = (sdramc_t *)(MMAP_SDRAM);
  40         gpio_t *gpio = (gpio_t *)(MMAP_GPIO);
  41         u32 i;
  42
  43         dramsize = CONFIG_SYS_SDRAM_SIZE * 0x100000;
  44
  45         if ((in_be32(&sdram->sdcfg1) == CONFIG_SYS_SDRAM_CFG1) &&
  46             (in_be32(&sdram->sdcfg2) == CONFIG_SYS_SDRAM_CFG2))
  47                 return dramsize;
  48
  49         for (i = 0x13; i < 0x20; i++) {
  50                 if (dramsize == (1 << i))
  51                         break;
  52         }
  53         i--;
  54
  55         out_8(&gpio->mscr_sdram, CONFIG_SYS_SDRAM_DRV_STRENGTH);
  56
  57         out_be32(&sdram->sdcs0, CONFIG_SYS_SDRAM_BASE | i);
  58
  59         out_be32(&sdram->sdcfg1, CONFIG_SYS_SDRAM_CFG1);
  60         out_be32(&sdram->sdcfg2, CONFIG_SYS_SDRAM_CFG2);
  61
  62         udelay(200);
  63
  64         /* Issue PALL */
  65         out_be32(&sdram->sdcr, CONFIG_SYS_SDRAM_CTRL | 2);
  66         __asm__("nop");
  67
  68         /* Perform two refresh cycles */
  69         out_be32(&sdram->sdcr, CONFIG_SYS_SDRAM_CTRL | 4);
  70         __asm__("nop");
  71         out_be32(&sdram->sdcr, CONFIG_SYS_SDRAM_CTRL | 4);
  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_MODE);
  78         __asm__("nop");
  79
  80         out_be32(&sdram->sdcr,
  81                 (CONFIG_SYS_SDRAM_CTRL & ~0x80000000) | 0x10000000);
  82
  83         udelay(100);
  84 #endif
  85         return (dramsize);
  86 };
  87
  88 int testdram(void)
  89 {
  90         /* TODO: XXX XXX XXX */
  91         printf("DRAM test not implemented!\n");
  92
  93         return (0);
  94 }