sdram.c
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/*
* Copyright (C) 2007 Freescale Semiconductor, Inc.
*
* Authors: Nick.Spence@freescale.com
* Wilson.Lo@freescale.com
* scottwood@freescale.com
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <mpc83xx.h>
#include <spd_sdram.h>
#include <asm/bitops.h>
#include <asm/io.h>
#include <asm/processor.h>
DECLARE_GLOBAL_DATA_PTR;
static void resume_from_sleep(void)
{
u32 magic = *(u32 *)0;
typedef void (*func_t)(void);
func_t resume = *(func_t *)4;
if (magic == 0xf5153ae5)
resume();
gd->flags &= ~GD_FLG_SILENT;
puts("\nResume from sleep failed: bad magic word\n");
}
/* Fixed sdram init -- doesn't use serial presence detect.
*
* This is useful for faster booting in configs where the RAM is unlikely
* to be changed, or for things like NAND booting where space is tight.
*/
#ifndef CONFIG_SYS_RAMBOOT
static long fixed_sdram(void)
{
volatile immap_t *im = (volatile immap_t *)CONFIG_SYS_IMMR;
u32 msize = CONFIG_SYS_DDR_SIZE * 1024 * 1024;
u32 msize_log2 = __ilog2(msize);
im->sysconf.ddrlaw[0].bar = CONFIG_SYS_DDR_SDRAM_BASE & 0xfffff000;
im->sysconf.ddrlaw[0].ar = LBLAWAR_EN | (msize_log2 - 1);
im->sysconf.ddrcdr = CONFIG_SYS_DDRCDR_VALUE;
/*
* Erratum DDR3 requires a 50ms delay after clearing DDRCDR[DDR_cfg],
* or the DDR2 controller may fail to initialize correctly.
*/
__udelay(50000);
im->ddr.csbnds[0].csbnds = (msize - 1) >> 24;
im->ddr.cs_config[0] = CONFIG_SYS_DDR_CS0_CONFIG;
/* Currently we use only one CS, so disable the other bank. */
im->ddr.cs_config[1] = 0;
im->ddr.sdram_clk_cntl = CONFIG_SYS_DDR_SDRAM_CLK_CNTL;
im->ddr.timing_cfg_3 = CONFIG_SYS_DDR_TIMING_3;
im->ddr.timing_cfg_1 = CONFIG_SYS_DDR_TIMING_1;
im->ddr.timing_cfg_2 = CONFIG_SYS_DDR_TIMING_2;
im->ddr.timing_cfg_0 = CONFIG_SYS_DDR_TIMING_0;
if (im->pmc.pmccr1 & PMCCR1_POWER_OFF)
im->ddr.sdram_cfg = CONFIG_SYS_DDR_SDRAM_CFG | SDRAM_CFG_BI;
else
im->ddr.sdram_cfg = CONFIG_SYS_DDR_SDRAM_CFG;
im->ddr.sdram_cfg2 = CONFIG_SYS_DDR_SDRAM_CFG2;
im->ddr.sdram_mode = CONFIG_SYS_DDR_MODE;
im->ddr.sdram_mode2 = CONFIG_SYS_DDR_MODE2;
im->ddr.sdram_interval = CONFIG_SYS_DDR_INTERVAL;
sync();
/* enable DDR controller */
im->ddr.sdram_cfg |= SDRAM_CFG_MEM_EN;
sync();
return msize;
}
#else
static long fixed_sdram(void)
{
return CONFIG_SYS_DDR_SIZE * 1024 * 1024;
}
#endif /* CONFIG_SYS_RAMBOOT */
int dram_init(void)
{
volatile immap_t *im = (volatile immap_t *)CONFIG_SYS_IMMR;
u32 msize;
if ((im->sysconf.immrbar & IMMRBAR_BASE_ADDR) != (u32)im)
return -ENXIO;
/* DDR SDRAM */
msize = fixed_sdram();
if (im->pmc.pmccr1 & PMCCR1_POWER_OFF)
resume_from_sleep();
/* set total bus SDRAM size(bytes) -- DDR */
gd->ram_size = msize;
return 0;
}