1/*
 2 * Device tree support
 3 *
 4 * Copyright (C) 2013, 2015 Altera Corporation
 5 * Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw>
 6 *
 7 * Based on MIPS support for CONFIG_OF device tree support
 8 *
 9 * Copyright (C) 2010 Cisco Systems Inc. <dediao@cisco.com>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
23 *
24 */
25
26#include <linux/init.h>
27#include <linux/types.h>
28#include <linux/bootmem.h>
29#include <linux/of.h>
30#include <linux/of_fdt.h>
31#include <linux/io.h>
32
33#include <asm/sections.h>
34
35void __init early_init_dt_add_memory_arch(u64 base, u64 size)
36{
37	u64 kernel_start = (u64)virt_to_phys(_text);
38
39	if (!memory_size &&
40	    (kernel_start >= base) && (kernel_start < (base + size)))
41		memory_size = size;
42
43}
44
45int __init early_init_dt_reserve_memory_arch(phys_addr_t base, phys_addr_t size,
46					     bool nomap)
47{
48	reserve_bootmem(base, size, BOOTMEM_DEFAULT);
49	return 0;
50}
51
52void __init early_init_devtree(void *params)
53{
54	__be32 *dtb = (u32 *)__dtb_start;
55#if defined(CONFIG_NIOS2_DTB_AT_PHYS_ADDR)
56	if (be32_to_cpup((__be32 *)CONFIG_NIOS2_DTB_PHYS_ADDR) ==
57		 OF_DT_HEADER) {
58		params = (void *)CONFIG_NIOS2_DTB_PHYS_ADDR;
59		early_init_dt_scan(params);
60		return;
61	}
62#endif
63	if (be32_to_cpu((__be32) *dtb) == OF_DT_HEADER)
64		params = (void *)__dtb_start;
65
66	early_init_dt_scan(params);
67}