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  * SPDX-License-Identifier:     GPL-2.0+
   9  */
  10
  11 #include <common.h>
  12 #include <asm/immap.h>
  13 #include <asm/io.h>
  14
  15 DECLARE_GLOBAL_DATA_PTR;
  16
  17 int checkboard(void)
  18 {
  19         puts("Board: ");
  20         puts("Freescale M52277 EVB\n");
  21         return 0;
  22 };
  23
  24 int initdram(void)
  25 {
  26         u32 dramsize;
  27
  28 #ifdef CONFIG_CF_SBF
  29         /*
  30          * Serial Boot: The dram is already initialized in start.S
  31          * only require to return DRAM size
  32          */
  33         dramsize = CONFIG_SYS_SDRAM_SIZE * 0x100000;
  34 #else
  35         sdramc_t *sdram = (sdramc_t *)(MMAP_SDRAM);
  36         gpio_t *gpio = (gpio_t *)(MMAP_GPIO);
  37         u32 i;
  38
  39         dramsize = CONFIG_SYS_SDRAM_SIZE * 0x100000;
  40
  41         for (i = 0x13; i < 0x20; i++) {
  42                 if (dramsize == (1 << i))
  43                         break;
  44         }
  45         i--;
  46
  47         out_8(&gpio->mscr_sdram, CONFIG_SYS_SDRAM_DRV_STRENGTH);
  48
  49         out_be32(&sdram->sdcs0, CONFIG_SYS_SDRAM_BASE | i);
  50
  51         out_be32(&sdram->sdcfg1, CONFIG_SYS_SDRAM_CFG1);
  52         out_be32(&sdram->sdcfg2, CONFIG_SYS_SDRAM_CFG2);
  53
  54         /* Issue PALL */
  55         out_be32(&sdram->sdcr, CONFIG_SYS_SDRAM_CTRL | 2);
  56         __asm__("nop");
  57
  58         /* Issue LEMR */
  59         out_be32(&sdram->sdmr, CONFIG_SYS_SDRAM_MODE);
  60         __asm__("nop");
  61         out_be32(&sdram->sdmr, CONFIG_SYS_SDRAM_EMOD);
  62         __asm__("nop");
  63
  64         udelay(1000);
  65
  66         /* Issue PALL */
  67         out_be32(&sdram->sdcr, CONFIG_SYS_SDRAM_CTRL | 2);
  68         __asm__("nop");
  69
  70         /* Perform two refresh cycles */
  71         out_be32(&sdram->sdcr, CONFIG_SYS_SDRAM_CTRL | 4);
  72         __asm__("nop");
  73         out_be32(&sdram->sdcr, CONFIG_SYS_SDRAM_CTRL | 4);
  74         __asm__("nop");
  75
  76         out_be32(&sdram->sdcr,
  77                 (CONFIG_SYS_SDRAM_CTRL & ~0x80000000) | 0x10000c00);
  78
  79         udelay(100);
  80 #endif
  81         gd->ram_size = dramsize;
  82
  83         return 0;
  84 };
  85
  86 int testdram(void)
  87 {
  88         /* TODO: XXX XXX XXX */
  89         printf("DRAM test not implemented!\n");
  90
  91         return (0);
  92 }