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/*
* Copyright (C) 2016 Socionext Inc.
* Author: Masahiro Yamada <yamada.masahiro@socionext.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <libfdt.h>
#include <asm/spin_table.h>
int spin_table_update_dt(void *fdt)
{
int cpus_offset, offset;
const char *prop;
int ret;
unsigned long rsv_addr = (unsigned long)&spin_table_reserve_begin;
unsigned long rsv_size = &spin_table_reserve_end -
&spin_table_reserve_begin;
cpus_offset = fdt_path_offset(fdt, "/cpus");
if (cpus_offset < 0)
return -ENODEV;
for (offset = fdt_first_subnode(fdt, cpus_offset);
offset >= 0;
offset = fdt_next_subnode(fdt, offset)) {
prop = fdt_getprop(fdt, offset, "device_type", NULL);
if (!prop || strcmp(prop, "cpu"))
continue;
/*
* In the first loop, we check if every CPU node specifies
* spin-table. Otherwise, just return successfully to not
* disturb other methods, like psci.
*/
prop = fdt_getprop(fdt, offset, "enable-method", NULL);
if (!prop || strcmp(prop, "spin-table"))
return 0;
}
for (offset = fdt_first_subnode(fdt, cpus_offset);
offset >= 0;
offset = fdt_next_subnode(fdt, offset)) {
prop = fdt_getprop(fdt, offset, "device_type", NULL);
if (!prop || strcmp(prop, "cpu"))
continue;
ret = fdt_setprop_u64(fdt, offset, "cpu-release-addr",
(unsigned long)&spin_table_cpu_release_addr);
if (ret)
return -ENOSPC;
}
ret = fdt_add_mem_rsv(fdt, rsv_addr, rsv_size);
if (ret)
return -ENOSPC;
printf(" Reserved memory region for spin-table: addr=%lx size=%lx\n",
rsv_addr, rsv_size);
return 0;
}
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