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/*
* (C) Copyright 2000-2003
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* Copyright (C) 2005-2008 Arthur Shipkowski (art@videon-central.com)
*
* Copyright (C) 2012 Freescale Semiconductor, Inc. All Rights Reserved.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/immap.h>
#include <asm/io.h>
DECLARE_GLOBAL_DATA_PTR;
#define PERIOD 13 /* system bus period in ns */
#define SDRAM_TREFI 7800 /* in ns */
int checkboard(void)
{
puts("Board: ");
puts("Freescale MCF5275 EVB\n");
return 0;
};
int dram_init(void)
{
sdramctrl_t *sdp = (sdramctrl_t *)(MMAP_SDRAM);
gpio_t *gpio_reg = (gpio_t *)(MMAP_GPIO);
/* Enable SDRAM */
out_be16(&gpio_reg->par_sdram, 0x3FF);
/* Set up chip select */
out_be32(&sdp->sdbar0, CONFIG_SYS_SDRAM_BASE);
out_be32(&sdp->sdbmr0, MCF_SDRAMC_SDMRn_BAM_32M | MCF_SDRAMC_SDMRn_V);
/* Set up timing */
out_be32(&sdp->sdcfg1, 0x83711630);
out_be32(&sdp->sdcfg2, 0x46770000);
/* Enable clock */
out_be32(&sdp->sdcr, MCF_SDRAMC_SDCR_MODE_EN | MCF_SDRAMC_SDCR_CKE);
/* Set precharge */
setbits_be32(&sdp->sdcr, MCF_SDRAMC_SDCR_IPALL);
/* Dummy write to start SDRAM */
*((volatile unsigned long *)CONFIG_SYS_SDRAM_BASE) = 0xa5a59696;
/* Send LEMR */
setbits_be32(&sdp->sdmr,
MCF_SDRAMC_SDMR_BNKAD_LEMR | MCF_SDRAMC_SDMR_AD(0x0) |
MCF_SDRAMC_SDMR_CMD);
*((volatile unsigned long *)CONFIG_SYS_SDRAM_BASE) = 0xa5a59696;
/* Send LMR */
out_be32(&sdp->sdmr, 0x058d0000);
*((volatile unsigned long *)CONFIG_SYS_SDRAM_BASE) = 0xa5a59696;
/* Stop sending commands */
clrbits_be32(&sdp->sdmr, MCF_SDRAMC_SDMR_CMD);
/* Set precharge */
setbits_be32(&sdp->sdcr, MCF_SDRAMC_SDCR_IPALL);
*((volatile unsigned long *)CONFIG_SYS_SDRAM_BASE) = 0xa5a59696;
/* Stop manual precharge, send 2 IREF */
clrbits_be32(&sdp->sdcr, MCF_SDRAMC_SDCR_IPALL);
setbits_be32(&sdp->sdcr, MCF_SDRAMC_SDCR_IREF);
*((volatile unsigned long *)CONFIG_SYS_SDRAM_BASE) = 0xa5a59696;
*((volatile unsigned long *)CONFIG_SYS_SDRAM_BASE) = 0xa5a59696;
out_be32(&sdp->sdmr, 0x018d0000);
*((volatile unsigned long *)CONFIG_SYS_SDRAM_BASE) = 0xa5a59696;
/* Stop sending commands */
clrbits_be32(&sdp->sdmr, MCF_SDRAMC_SDMR_CMD);
clrbits_be32(&sdp->sdcr, MCF_SDRAMC_SDCR_MODE_EN);
/* Turn on auto refresh, lock SDMR */
out_be32(&sdp->sdcr,
MCF_SDRAMC_SDCR_CKE
| MCF_SDRAMC_SDCR_REF
| MCF_SDRAMC_SDCR_MUX(1)
/* 1 added to round up */
| MCF_SDRAMC_SDCR_RCNT((SDRAM_TREFI/(PERIOD*64)) - 1 + 1)
| MCF_SDRAMC_SDCR_DQS_OE(0x3));
gd->ram_size = CONFIG_SYS_SDRAM_SIZE * 1024 * 1024;
return 0;
};
int testdram(void)
{
/* TODO: XXX XXX XXX */
printf("DRAM test not implemented!\n");
return (0);
}
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