m54451evb.c
1.93 KB
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/*
* (C) Copyright 2000-2003
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* Copyright (C) 2004-2008, 2012 Freescale Semiconductor, Inc.
* TsiChung Liew (Tsi-Chung.Liew@freescale.com)
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <spi.h>
#include <asm/immap.h>
#include <asm/io.h>
DECLARE_GLOBAL_DATA_PTR;
int checkboard(void)
{
/*
* need to to:
* Check serial flash size. if 2mb evb, else 8mb demo
*/
puts("Board: ");
puts("Freescale M54451 EVB\n");
return 0;
};
int dram_init(void)
{
u32 dramsize;
#ifdef CONFIG_CF_SBF
/*
* Serial Boot: The dram is already initialized in start.S
* only require to return DRAM size
*/
dramsize = CONFIG_SYS_SDRAM_SIZE * 0x100000;
#else
sdramc_t *sdram = (sdramc_t *)(MMAP_SDRAM);
gpio_t *gpio = (gpio_t *)(MMAP_GPIO);
u32 i;
dramsize = CONFIG_SYS_SDRAM_SIZE * 0x100000;
if ((in_be32(&sdram->sdcfg1) == CONFIG_SYS_SDRAM_CFG1) &&
(in_be32(&sdram->sdcfg2) == CONFIG_SYS_SDRAM_CFG2))
return dramsize;
for (i = 0x13; i < 0x20; i++) {
if (dramsize == (1 << i))
break;
}
i--;
out_8(&gpio->mscr_sdram, CONFIG_SYS_SDRAM_DRV_STRENGTH);
out_be32(&sdram->sdcs0, CONFIG_SYS_SDRAM_BASE | i);
out_be32(&sdram->sdcfg1, CONFIG_SYS_SDRAM_CFG1);
out_be32(&sdram->sdcfg2, CONFIG_SYS_SDRAM_CFG2);
udelay(200);
/* Issue PALL */
out_be32(&sdram->sdcr, CONFIG_SYS_SDRAM_CTRL | 2);
__asm__("nop");
/* Perform two refresh cycles */
out_be32(&sdram->sdcr, CONFIG_SYS_SDRAM_CTRL | 4);
__asm__("nop");
out_be32(&sdram->sdcr, CONFIG_SYS_SDRAM_CTRL | 4);
__asm__("nop");
/* Issue LEMR */
out_be32(&sdram->sdmr, CONFIG_SYS_SDRAM_MODE);
__asm__("nop");
out_be32(&sdram->sdmr, CONFIG_SYS_SDRAM_MODE);
__asm__("nop");
out_be32(&sdram->sdcr,
(CONFIG_SYS_SDRAM_CTRL & ~0x80000000) | 0x10000000);
udelay(100);
#endif
gd->ram_size = dramsize;
return 0;
};
int testdram(void)
{
/* TODO: XXX XXX XXX */
printf("DRAM test not implemented!\n");
return (0);
}