1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * Copyright (C) 2020 Western Digital Corporation or its affiliates.
4 * Copyright (C) 2020 Google, Inc
5 */
6
7#ifndef _ASM_RISCV_SOC_H
8#define _ASM_RISCV_SOC_H
9
10#include <linux/of.h>
11#include <linux/linkage.h>
12#include <linux/types.h>
13
14#define SOC_EARLY_INIT_DECLARE(name, compat, fn)			\
15	static const struct of_device_id __soc_early_init__##name	\
16		__used __section("__soc_early_init_table")		\
17		 = { .compatible = compat, .data = fn  }
18
19void soc_early_init(void);
20
21extern unsigned long __soc_early_init_table_start;
22extern unsigned long __soc_early_init_table_end;
23
24/*
25 * Allows Linux to provide a device tree, which is necessary for SOCs that
26 * don't provide a useful one on their own.
27 */
28struct soc_builtin_dtb {
29	unsigned long vendor_id;
30	unsigned long arch_id;
31	unsigned long imp_id;
32	void *(*dtb_func)(void);
33};
34
35/*
36 * The argument name must specify a valid DTS file name without the dts
37 * extension.
38 */
39#define SOC_BUILTIN_DTB_DECLARE(name, vendor, arch, impl)		\
40	extern void *__dtb_##name##_begin;				\
41									\
42	static __init __used						\
43	void *__soc_builtin_dtb_f__##name(void)				\
44	{								\
45		return (void *)&__dtb_##name##_begin;			\
46	}								\
47									\
48	static const struct soc_builtin_dtb __soc_builtin_dtb__##name	\
49		__used __section("__soc_builtin_dtb_table") =		\
50	{								\
51		.vendor_id = vendor,					\
52		.arch_id   = arch,					\
53		.imp_id    = impl,					\
54		.dtb_func  = __soc_builtin_dtb_f__##name,		\
55	}
56
57extern unsigned long __soc_builtin_dtb_table_start;
58extern unsigned long __soc_builtin_dtb_table_end;
59
60void *soc_lookup_builtin_dtb(void);
61
62#endif
63