git.sur5r.net Git - u-boot/blob - 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 <asm/immap.h>
  12 #include <asm/io.h>
  13
  14 DECLARE_GLOBAL_DATA_PTR;
  15
  16 int checkboard(void)
  17 {
  18         puts("Board: ");
  19         puts("Freescale M52277 EVB\n");
  20         return 0;
  21 };
  22
  23 int dram_init(void)
  24 {
  25         u32 dramsize;
  26
  27 #ifdef CONFIG_CF_SBF
  28         /*
  29          * Serial Boot: The dram is already initialized in start.S
  30          * only require to return DRAM size
  31          */
  32         dramsize = CONFIG_SYS_SDRAM_SIZE * 0x100000;
  33 #else
  34         sdramc_t *sdram = (sdramc_t *)(MMAP_SDRAM);
  35         gpio_t *gpio = (gpio_t *)(MMAP_GPIO);
  36         u32 i;
  37
  38         dramsize = CONFIG_SYS_SDRAM_SIZE * 0x100000;
  39
  40         for (i = 0x13; i < 0x20; i++) {
  41                 if (dramsize == (1 << i))
  42                         break;
  43         }
  44         i--;
  45
  46         out_8(&gpio->mscr_sdram, CONFIG_SYS_SDRAM_DRV_STRENGTH);
  47
  48         out_be32(&sdram->sdcs0, CONFIG_SYS_SDRAM_BASE | i);
  49
  50         out_be32(&sdram->sdcfg1, CONFIG_SYS_SDRAM_CFG1);
  51         out_be32(&sdram->sdcfg2, CONFIG_SYS_SDRAM_CFG2);
  52
  53         /* Issue PALL */
  54         out_be32(&sdram->sdcr, CONFIG_SYS_SDRAM_CTRL | 2);
  55         __asm__("nop");
  56
  57         /* Issue LEMR */
  58         out_be32(&sdram->sdmr, CONFIG_SYS_SDRAM_MODE);
  59         __asm__("nop");
  60         out_be32(&sdram->sdmr, CONFIG_SYS_SDRAM_EMOD);
  61         __asm__("nop");
  62
  63         udelay(1000);
  64
  65         /* Issue PALL */
  66         out_be32(&sdram->sdcr, CONFIG_SYS_SDRAM_CTRL | 2);
  67         __asm__("nop");
  68
  69         /* Perform two refresh cycles */
  70         out_be32(&sdram->sdcr, CONFIG_SYS_SDRAM_CTRL | 4);
  71         __asm__("nop");
  72         out_be32(&sdram->sdcr, CONFIG_SYS_SDRAM_CTRL | 4);
  73         __asm__("nop");
  74
  75         out_be32(&sdram->sdcr,
  76                 (CONFIG_SYS_SDRAM_CTRL & ~0x80000000) | 0x10000c00);
  77
  78         udelay(100);
  79 #endif
  80         gd->ram_size = dramsize;
  81
  82         return 0;
  83 };
  84
  85 int testdram(void)
  86 {
  87         /* TODO: XXX XXX XXX */
  88         printf("DRAM test not implemented!\n");
  89
  90         return (0);
  91 }