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 */
soc_early_init(void)14 void __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
soc_builtin_dtb_match(unsigned long vendor_id,unsigned long arch_id,unsigned long imp_id,const struct soc_builtin_dtb * entry)30 static 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
soc_lookup_builtin_dtb(void)39 void * __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 }
56
