1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
4  */
5 
6 #include <common.h>
7 #include <fdtdec.h>
8 #include <init.h>
9 #include <asm/global_data.h>
10 #include <linux/sizes.h>
11 
12 DECLARE_GLOBAL_DATA_PTR;
13 
dram_init(void)14 int dram_init(void)
15 {
16 	return fdtdec_setup_mem_size_base();
17 }
18 
dram_init_banksize(void)19 int dram_init_banksize(void)
20 {
21 	return fdtdec_setup_memory_banksize();
22 }
23 
board_get_usable_ram_top(ulong total_size)24 ulong board_get_usable_ram_top(ulong total_size)
25 {
26 	/*
27 	 * Ensure that we run from first 4GB so that all
28 	 * addresses used by U-Boot are 32bit addresses.
29 	 *
30 	 * This in-turn ensures that 32bit DMA capable
31 	 * devices work fine because DMA mapping APIs will
32 	 * provide 32bit DMA addresses only.
33 	 */
34 	if (gd->ram_top >= SZ_4G)
35 		return SZ_4G - 1;
36 
37 	return gd->ram_top;
38 }
39