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 <linux/sizes.h>
9
10DECLARE_GLOBAL_DATA_PTR;
11
12int dram_init(void)
13{
14	return fdtdec_setup_mem_size_base();
15}
16
17int dram_init_banksize(void)
18{
19	return fdtdec_setup_memory_banksize();
20}
21
22phys_addr_t board_get_usable_ram_top(phys_size_t total_size)
23{
24#ifdef CONFIG_64BIT
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;
35#endif
36	return gd->ram_top;
37}
38