56 lines
1.5 KiB
C
56 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2020 Western Digital Corporation or its affiliates.
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*/
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#include <linux/init.h>
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#include <linux/libfdt.h>
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#include <linux/pgtable.h>
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#include <asm/soc.h>
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/*
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* This is called extremly early, before parse_dtb(), to allow initializing
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* SoC hardware before memory or any device driver initialization.
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*/
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void __init soc_early_init(void)
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{
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void (*early_fn)(const void *fdt);
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const struct of_device_id *s;
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const void *fdt = dtb_early_va;
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for (s = (void *)&__soc_early_init_table_start;
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(void *)s < (void *)&__soc_early_init_table_end; s++) {
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if (!fdt_node_check_compatible(fdt, 0, s->compatible)) {
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early_fn = s->data;
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early_fn(fdt);
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return;
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}
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}
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}
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static bool soc_builtin_dtb_match(unsigned long vendor_id,
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unsigned long arch_id, unsigned long imp_id,
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const struct soc_builtin_dtb *entry)
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{
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return entry->vendor_id == vendor_id &&
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entry->arch_id == arch_id &&
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entry->imp_id == imp_id;
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}
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void * __init soc_lookup_builtin_dtb(void)
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{
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unsigned long vendor_id, arch_id, imp_id;
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const struct soc_builtin_dtb *s;
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__asm__ ("csrr %0, mvendorid" : "=r"(vendor_id));
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__asm__ ("csrr %0, marchid" : "=r"(arch_id));
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__asm__ ("csrr %0, mimpid" : "=r"(imp_id));
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for (s = (void *)&__soc_builtin_dtb_table_start;
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(void *)s < (void *)&__soc_builtin_dtb_table_end; s++) {
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if (soc_builtin_dtb_match(vendor_id, arch_id, imp_id, s))
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return s->dtb_func();
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}
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return NULL;
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}
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