board/freescale/m52277evb/m52277evb.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2000-2003
   4  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   5  *
   6  * Copyright (C) 2004-2007, 2012 Freescale Semiconductor, Inc.
   7  * TsiChung Liew (Tsi-Chung.Liew@freescale.com)
   8  */
   9
  10 #include <common.h>
  11 #include <init.h>
  12 #include <asm/immap.h>
  13 #include <asm/io.h>
  14 #include <linux/delay.h>
  15
  16 DECLARE_GLOBAL_DATA_PTR;
  17
  18 int checkboard(void)
  19 {
  20         puts("Board: ");
  21         puts("Freescale M52277 EVB\n");
  22         return 0;
  23 };
  24
  25 int dram_init(void)
  26 {
  27         u32 dramsize;
  28
  29 #ifdef CONFIG_CF_SBF
  30         /*
  31          * Serial Boot: The dram is already initialized in start.S
  32          * only require to return DRAM size
  33          */
  34         dramsize = CONFIG_SYS_SDRAM_SIZE * 0x100000;
  35 #else
  36         sdramc_t *sdram = (sdramc_t *)(MMAP_SDRAM);
  37         gpio_t *gpio = (gpio_t *)(MMAP_GPIO);
  38         u32 i;
  39
  40         dramsize = CONFIG_SYS_SDRAM_SIZE * 0x100000;
  41
  42         for (i = 0x13; i < 0x20; i++) {
  43                 if (dramsize == (1 << i))
  44                         break;
  45         }
  46         i--;
  47
  48         out_8(&gpio->mscr_sdram, CONFIG_SYS_SDRAM_DRV_STRENGTH);
  49
  50         out_be32(&sdram->sdcs0, CONFIG_SYS_SDRAM_BASE | i);
  51
  52         out_be32(&sdram->sdcfg1, CONFIG_SYS_SDRAM_CFG1);
  53         out_be32(&sdram->sdcfg2, CONFIG_SYS_SDRAM_CFG2);
  54
  55         /* Issue PALL */
  56         out_be32(&sdram->sdcr, CONFIG_SYS_SDRAM_CTRL | 2);
  57         __asm__("nop");
  58
  59         /* Issue LEMR */
  60         out_be32(&sdram->sdmr, CONFIG_SYS_SDRAM_MODE);
  61         __asm__("nop");
  62         out_be32(&sdram->sdmr, CONFIG_SYS_SDRAM_EMOD);
  63         __asm__("nop");
  64
  65         udelay(1000);
  66
  67         /* Issue PALL */
  68         out_be32(&sdram->sdcr, CONFIG_SYS_SDRAM_CTRL | 2);
  69         __asm__("nop");
  70
  71         /* Perform two refresh cycles */
  72         out_be32(&sdram->sdcr, CONFIG_SYS_SDRAM_CTRL | 4);
  73         __asm__("nop");
  74         out_be32(&sdram->sdcr, CONFIG_SYS_SDRAM_CTRL | 4);
  75         __asm__("nop");
  76
  77         out_be32(&sdram->sdcr,
  78                 (CONFIG_SYS_SDRAM_CTRL & ~0x80000000) | 0x10000c00);
  79
  80         udelay(100);
  81 #endif
  82         gd->ram_size = dramsize;
  83
  84         return 0;
  85 };
  86
  87 int testdram(void)
  88 {
  89         /* TODO: XXX XXX XXX */
  90         printf("DRAM test not implemented!\n");
  91
  92         return (0);
  93 }