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95acd4c7 LFT |
1 | /* |
2 | * Device tree support | |
3 | * | |
e8bf5bc7 | 4 | * Copyright (C) 2013, 2015 Altera Corporation |
95acd4c7 LFT |
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 | ||
35 | void __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 | ||
45 | void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align) | |
46 | { | |
47 | return alloc_bootmem_align(size, align); | |
48 | } | |
49 | ||
921d701e TK |
50 | int __init early_init_dt_reserve_memory_arch(phys_addr_t base, phys_addr_t size, |
51 | bool nomap) | |
52 | { | |
53 | reserve_bootmem(base, size, BOOTMEM_DEFAULT); | |
54 | return 0; | |
55 | } | |
56 | ||
95acd4c7 LFT |
57 | void __init early_init_devtree(void *params) |
58 | { | |
59 | __be32 *dtb = (u32 *)__dtb_start; | |
60 | #if defined(CONFIG_NIOS2_DTB_AT_PHYS_ADDR) | |
61 | if (be32_to_cpup((__be32 *)CONFIG_NIOS2_DTB_PHYS_ADDR) == | |
62 | OF_DT_HEADER) { | |
63 | params = (void *)CONFIG_NIOS2_DTB_PHYS_ADDR; | |
64 | early_init_dt_scan(params); | |
65 | return; | |
66 | } | |
67 | #endif | |
68 | if (be32_to_cpu((__be32) *dtb) == OF_DT_HEADER) | |
69 | params = (void *)__dtb_start; | |
70 | ||
71 | early_init_dt_scan(params); | |
72 | } |