1// SPDX-License-Identifier: GPL-2.0-or-later
 2/*
 3 * Copyright (C) 2020 Western Digital Corporation or its affiliates.
 4 */
 5#include <linux/init.h>
 6#include <linux/libfdt.h>
 7#include <linux/pgtable.h>
 8#include <asm/soc.h>
 9
10/*
11 * This is called extremly early, before parse_dtb(), to allow initializing
12 * SoC hardware before memory or any device driver initialization.
13 */
14void __init soc_early_init(void)
15{
16	void (*early_fn)(const void *fdt);
17	const struct of_device_id *s;
18	const void *fdt = dtb_early_va;
19
20	for (s = (void *)&__soc_early_init_table_start;
21	     (void *)s < (void *)&__soc_early_init_table_end; s++) {
22		if (!fdt_node_check_compatible(fdt, 0, s->compatible)) {
23			early_fn = s->data;
24			early_fn(fdt);
25			return;
26		}
27	}
28}
29
30static bool soc_builtin_dtb_match(unsigned long vendor_id,
31				unsigned long arch_id, unsigned long imp_id,
32				const struct soc_builtin_dtb *entry)
33{
34	return entry->vendor_id == vendor_id &&
35	       entry->arch_id == arch_id &&
36	       entry->imp_id == imp_id;
37}
38
39void * __init soc_lookup_builtin_dtb(void)
40{
41	unsigned long vendor_id, arch_id, imp_id;
42	const struct soc_builtin_dtb *s;
43
44	__asm__ ("csrr %0, mvendorid" : "=r"(vendor_id));
45	__asm__ ("csrr %0, marchid" : "=r"(arch_id));
46	__asm__ ("csrr %0, mimpid" : "=r"(imp_id));
47
48	for (s = (void *)&__soc_builtin_dtb_table_start;
49	     (void *)s < (void *)&__soc_builtin_dtb_table_end; s++) {
50		if (soc_builtin_dtb_match(vendor_id, arch_id, imp_id, s))
51			return s->dtb_func();
52	}
53
54	return NULL;
55}

 1// SPDX-License-Identifier: GPL-2.0-or-later
 2/*
 3 * Copyright (C) 2020 Western Digital Corporation or its affiliates.
 4 */
 5#include <linux/init.h>
 6#include <linux/libfdt.h>
 7#include <linux/pgtable.h>
 8#include <asm/soc.h>
 9
10/*
11 * This is called extremly early, before parse_dtb(), to allow initializing
12 * SoC hardware before memory or any device driver initialization.
13 */
14void __init soc_early_init(void)
15{
16	void (*early_fn)(const void *fdt);
17	const struct of_device_id *s;
18	const void *fdt = dtb_early_va;
19
20	for (s = (void *)&__soc_early_init_table_start;
21	     (void *)s < (void *)&__soc_early_init_table_end; s++) {
22		if (!fdt_node_check_compatible(fdt, 0, s->compatible)) {
23			early_fn = s->data;
24			early_fn(fdt);
25			return;
26		}
27	}
28}