| | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
| | 2 | /* |
| | 3 | * Device tree support |
| | 4 | * |
| | 5 | * Copyright (C) 2013, 2015 Altera Corporation |
| | 6 | * Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw> |
| | 7 | * |
| | 8 | * Based on MIPS support for CONFIG_OF device tree support |
| | 9 | * |
| | 10 | * Copyright (C) 2010 Cisco Systems Inc. <dediao@cisco.com> |
| | 11 | */ |
| | 12 | |
| | 13 | #include <linux/init.h> |
| | 14 | #include <linux/types.h> |
| | 15 | #include <linux/memblock.h> |
| | 16 | #include <linux/of.h> |
| | 17 | #include <linux/of_fdt.h> |
| | 18 | #include <linux/io.h> |
| | 19 | |
| | 20 | #include <asm/sections.h> |
| | 21 | |
| | 22 | void __init early_init_devtree(void *params) |
| | 23 | { |
| | 24 | __be32 __maybe_unused *dtb = (u32 *)__dtb_start; |
| | 25 | |
| | 26 | #if defined(CONFIG_NIOS2_DTB_AT_PHYS_ADDR) |
| | 27 | if (be32_to_cpup((__be32 *)CONFIG_NIOS2_DTB_PHYS_ADDR) == |
| | 28 | OF_DT_HEADER) { |
| | 29 | params = (void *)CONFIG_NIOS2_DTB_PHYS_ADDR; |
| | 30 | early_init_dt_scan(params, __pa(params)); |
| | 31 | return; |
| | 32 | } |
| | 33 | #endif |
| | 34 | |
| | 35 | #ifdef CONFIG_BUILTIN_DTB |
| | 36 | if (be32_to_cpu((__be32) *dtb) == OF_DT_HEADER) |
| | 37 | params = (void *)__dtb_start; |
| | 38 | #endif |
| | 39 | |
| | 40 | early_init_dt_scan(params, __pa(params)); |
| | 41 | } |
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