| 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
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| 2 | /* |
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| 3 | * Device tree support |
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| 4 | * |
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| 5 | * Copyright (C) 2013, 2015 Altera Corporation |
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| 6 | * Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw> |
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| 7 | * |
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| 8 | * Based on MIPS support for CONFIG_OF device tree support |
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| 9 | * |
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| 10 | * Copyright (C) 2010 Cisco Systems Inc. <dediao@cisco.com> |
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| 11 | */ |
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| 12 | |
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| 13 | #include <linux/init.h> |
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| 14 | #include <linux/types.h> |
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| 15 | #include <linux/memblock.h> |
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| 16 | #include <linux/of.h> |
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| 17 | #include <linux/of_fdt.h> |
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| 18 | #include <linux/io.h> |
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| 19 | |
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| 20 | #include <asm/sections.h> |
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| 21 | |
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| 22 | void __init early_init_devtree(void *params) |
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| 23 | { |
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| 24 | __be32 __maybe_unused *dtb = (u32 *)__dtb_start; |
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| 25 | |
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| 26 | #if defined(CONFIG_NIOS2_DTB_AT_PHYS_ADDR) |
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| 27 | if (be32_to_cpup((__be32 *)CONFIG_NIOS2_DTB_PHYS_ADDR) == |
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| 28 | OF_DT_HEADER) { |
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| 29 | params = (void *)CONFIG_NIOS2_DTB_PHYS_ADDR; |
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| 30 | early_init_dt_scan(params); |
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| 31 | return; |
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| 32 | } |
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| 33 | #endif |
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| 34 | |
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| 35 | #ifdef CONFIG_NIOS2_DTB_SOURCE_BOOL |
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| 36 | if (be32_to_cpu((__be32) *dtb) == OF_DT_HEADER) |
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| 37 | params = (void *)__dtb_start; |
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| 38 | #endif |
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| 39 | |
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| 40 | early_init_dt_scan(params); |
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| 41 | } |
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| 42 | |
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