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Diffstat (limited to 'src/soc/nvidia/tegra132/addressmap.c')
-rw-r--r-- | src/soc/nvidia/tegra132/addressmap.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/src/soc/nvidia/tegra132/addressmap.c b/src/soc/nvidia/tegra132/addressmap.c new file mode 100644 index 0000000000..92a7d76f65 --- /dev/null +++ b/src/soc/nvidia/tegra132/addressmap.c @@ -0,0 +1,52 @@ +/* + * 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); +} |