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 
11 DECLARE_GLOBAL_DATA_PTR;
12 
dram_init(void)13 int dram_init(void)
14 {
15 	return fdtdec_setup_mem_size_base();
16 }
17 
dram_init_banksize(void)18 int dram_init_banksize(void)
19 {
20 	return fdtdec_setup_memory_banksize();
21 }
22 
board_get_usable_ram_top(phys_size_t total_size)23 phys_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;
35 
36 	return gd->ram_top;
37 }
38