1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2016 Socionext Inc.
4 * Author: Masahiro Yamada <yamada.masahiro@socionext.com>
8 #include <linux/libfdt.h>
9 #include <asm/spin_table.h>
11 int spin_table_update_dt(void *fdt)
13 int cpus_offset, offset;
16 unsigned long rsv_addr = (unsigned long)&spin_table_reserve_begin;
17 unsigned long rsv_size = &spin_table_reserve_end -
18 &spin_table_reserve_begin;
20 cpus_offset = fdt_path_offset(fdt, "/cpus");
24 for (offset = fdt_first_subnode(fdt, cpus_offset);
26 offset = fdt_next_subnode(fdt, offset)) {
27 prop = fdt_getprop(fdt, offset, "device_type", NULL);
28 if (!prop || strcmp(prop, "cpu"))
32 * In the first loop, we check if every CPU node specifies
33 * spin-table. Otherwise, just return successfully to not
34 * disturb other methods, like psci.
36 prop = fdt_getprop(fdt, offset, "enable-method", NULL);
37 if (!prop || strcmp(prop, "spin-table"))
41 for (offset = fdt_first_subnode(fdt, cpus_offset);
43 offset = fdt_next_subnode(fdt, offset)) {
44 prop = fdt_getprop(fdt, offset, "device_type", NULL);
45 if (!prop || strcmp(prop, "cpu"))
48 ret = fdt_setprop_u64(fdt, offset, "cpu-release-addr",
49 (unsigned long)&spin_table_cpu_release_addr);
54 ret = fdt_add_mem_rsv(fdt, rsv_addr, rsv_size);
58 printf(" Reserved memory region for spin-table: addr=%lx size=%lx\n",