1 /* 2 * Copyright (C) 2016 Socionext Inc. 3 * Author: Masahiro Yamada <yamada.masahiro@socionext.com> 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8 #include <common.h> 9 #include <libfdt.h> 10 #include <asm/spin_table.h> 11 12 int spin_table_update_dt(void *fdt) 13 { 14 int cpus_offset, offset; 15 const char *prop; 16 int ret; 17 unsigned long rsv_addr = (unsigned long)&spin_table_reserve_begin; 18 unsigned long rsv_size = &spin_table_reserve_end - 19 &spin_table_reserve_begin; 20 21 cpus_offset = fdt_path_offset(fdt, "/cpus"); 22 if (cpus_offset < 0) 23 return -ENODEV; 24 25 for (offset = fdt_first_subnode(fdt, cpus_offset); 26 offset >= 0; 27 offset = fdt_next_subnode(fdt, offset)) { 28 prop = fdt_getprop(fdt, offset, "device_type", NULL); 29 if (!prop || strcmp(prop, "cpu")) 30 continue; 31 32 /* 33 * In the first loop, we check if every CPU node specifies 34 * spin-table. Otherwise, just return successfully to not 35 * disturb other methods, like psci. 36 */ 37 prop = fdt_getprop(fdt, offset, "enable-method", NULL); 38 if (!prop || strcmp(prop, "spin-table")) 39 return 0; 40 } 41 42 for (offset = fdt_first_subnode(fdt, cpus_offset); 43 offset >= 0; 44 offset = fdt_next_subnode(fdt, offset)) { 45 prop = fdt_getprop(fdt, offset, "device_type", NULL); 46 if (!prop || strcmp(prop, "cpu")) 47 continue; 48 49 ret = fdt_setprop_u64(fdt, offset, "cpu-release-addr", 50 (unsigned long)&spin_table_cpu_release_addr); 51 if (ret) 52 return -ENOSPC; 53 } 54 55 ret = fdt_add_mem_rsv(fdt, rsv_addr, rsv_size); 56 if (ret) 57 return -ENOSPC; 58 59 printf(" Reserved memory region for spin-table: addr=%lx size=%lx\n", 60 rsv_addr, rsv_size); 61 62 return 0; 63 } 64