LXR uboot/board/freescale/m54451evb/m54451evb.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) 2004-2008, 2012 Freescale Semiconductor, Inc.
   7 * TsiChung Liew (Tsi-Chung.Liew@freescale.com)
   8 */
   9
  10#include <common.h>
  11#include <spi.h>
  12#include <asm/immap.h>
  13#include <asm/io.h>
  14
  15DECLARE_GLOBAL_DATA_PTR;
  16
  17int checkboard(void)
  18{
  19        /*
  20         * need to to:
  21         * Check serial flash size. if 2mb evb, else 8mb demo
  22         */
  23        puts("Board: ");
  24        puts("Freescale M54451 EVB\n");
  25        return 0;
  26};
  27
  28int dram_init(void)
  29{
  30        u32 dramsize;
  31#ifdef CONFIG_CF_SBF
  32        /*
  33         * Serial Boot: The dram is already initialized in start.S
  34         * only require to return DRAM size
  35         */
  36        dramsize = CONFIG_SYS_SDRAM_SIZE * 0x100000;
  37#else
  38        sdramc_t *sdram = (sdramc_t *)(MMAP_SDRAM);
  39        gpio_t *gpio = (gpio_t *)(MMAP_GPIO);
  40        u32 i;
  41
  42        dramsize = CONFIG_SYS_SDRAM_SIZE * 0x100000;
  43
  44        if ((in_be32(&sdram->sdcfg1) == CONFIG_SYS_SDRAM_CFG1) &&
  45            (in_be32(&sdram->sdcfg2) == CONFIG_SYS_SDRAM_CFG2))
  46                return dramsize;
  47
  48        for (i = 0x13; i < 0x20; i++) {
  49                if (dramsize == (1 << i))
  50                        break;
  51        }
  52        i--;
  53
  54        out_8(&gpio->mscr_sdram, CONFIG_SYS_SDRAM_DRV_STRENGTH);
  55
  56        out_be32(&sdram->sdcs0, CONFIG_SYS_SDRAM_BASE | i);
  57
  58        out_be32(&sdram->sdcfg1, CONFIG_SYS_SDRAM_CFG1);
  59        out_be32(&sdram->sdcfg2, CONFIG_SYS_SDRAM_CFG2);
  60
  61        udelay(200);
  62
  63        /* Issue PALL */
  64        out_be32(&sdram->sdcr, CONFIG_SYS_SDRAM_CTRL | 2);
  65        __asm__("nop");
  66
  67        /* Perform two refresh cycles */
  68        out_be32(&sdram->sdcr, CONFIG_SYS_SDRAM_CTRL | 4);
  69        __asm__("nop");
  70        out_be32(&sdram->sdcr, CONFIG_SYS_SDRAM_CTRL | 4);
  71        __asm__("nop");
  72
  73        /* Issue LEMR */
  74        out_be32(&sdram->sdmr, CONFIG_SYS_SDRAM_MODE);
  75        __asm__("nop");
  76        out_be32(&sdram->sdmr, CONFIG_SYS_SDRAM_MODE);
  77        __asm__("nop");
  78
  79        out_be32(&sdram->sdcr,
  80                (CONFIG_SYS_SDRAM_CTRL & ~0x80000000) | 0x10000000);
  81
  82        udelay(100);
  83#endif
  84        gd->ram_size = dramsize;
  85
  86        return 0;
  87};
  88
  89int testdram(void)
  90{
  91        /* TODO: XXX XXX XXX */
  92        printf("DRAM test not implemented!\n");
  93
  94        return (0);
  95}
  96