1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
4 */
5
6#include <fdtdec.h>
7#include <init.h>
8#include <asm/global_data.h>
9#include <linux/sizes.h>
10
11DECLARE_GLOBAL_DATA_PTR;
12
13int dram_init(void)
14{
15	return fdtdec_setup_mem_size_base();
16}
17
18int dram_init_banksize(void)
19{
20	return fdtdec_setup_memory_banksize();
21}
22
23phys_addr_t board_get_usable_ram_top(phys_size_t total_size)
24{
25	/*
26	 * Ensure that we run from first 4GB so that all
27	 * addresses used by U-Boot are 32bit addresses.
28	 *
29	 * This in-turn ensures that 32bit DMA capable
30	 * devices work fine because DMA mapping APIs will
31	 * provide 32bit DMA addresses only.
32	 */
33	if (gd->ram_top >= SZ_4G)
34		return SZ_4G - 1;
35
36	return gd->ram_top;
37}
38