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/*
* This file is part of the coreboot project.
*
* Copyright 2014 Google Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <arch/io.h>
#include <stdlib.h>
#include <console/console.h>
#include <soc/addressmap.h>
#include "mc.h"
#include "sdram.h"
/* returns total amount of DRAM (in MB) from memory controller registers */
int sdram_size_mb(void)
{
struct tegra_mc_regs *mc = (struct tegra_mc_regs *)TEGRA_MC_BASE;
static int total_size = 0;
if (total_size)
return total_size;
/*
* This obtains memory size from the External Memory Aperture
* Configuration register. Nvidia confirmed that it is safe to assume
* this value represents the total physical DRAM size.
*/
total_size = (read32(&mc->emem_cfg) >> MC_EMEM_CFG_SIZE_MB_SHIFT) &
MC_EMEM_CFG_SIZE_MB_MASK;
printk(BIOS_DEBUG, "%s: Total SDRAM (MB): %u\n", __func__, total_size);
return total_size;
}
uintptr_t sdram_max_addressable_mb(void)
{
return MIN((CONFIG_SYS_SDRAM_BASE/MiB) + sdram_size_mb(), 4096);
}
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