2 * CPU kernel entry/exit control
4 * Copyright (C) 2013 ARM Ltd.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
19 #include <linux/acpi.h>
20 #include <linux/errno.h>
22 #include <linux/string.h>
24 #include <asm/cpu_ops.h>
25 #include <asm/smp_plat.h>
27 extern const struct cpu_operations smp_spin_table_ops;
28 extern const struct cpu_operations cpu_psci_ops;
30 const struct cpu_operations *cpu_ops[NR_CPUS];
32 static const struct cpu_operations *supported_cpu_ops[] __initconst = {
38 static const struct cpu_operations * __init cpu_get_ops(const char *name)
40 const struct cpu_operations **ops = supported_cpu_ops;
43 if (!strcmp(name, (*ops)->name))
52 static const char *__init cpu_read_enable_method(int cpu)
54 const char *enable_method;
57 struct device_node *dn = of_get_cpu_node(cpu, NULL);
61 pr_err("Failed to find device node for boot cpu\n");
65 enable_method = of_get_property(dn, "enable-method", NULL);
68 * The boot CPU may not have an enable method (e.g.
69 * when spin-table is used for secondaries).
70 * Don't warn spuriously.
73 pr_err("%s: missing enable-method property\n",
77 enable_method = acpi_get_enable_method(cpu);
79 pr_err("Unsupported ACPI enable-method\n");
85 * Read a cpu's enable method and record it in cpu_ops.
87 int __init cpu_read_ops(int cpu)
89 const char *enable_method = cpu_read_enable_method(cpu);
94 cpu_ops[cpu] = cpu_get_ops(enable_method);
96 pr_warn("Unsupported enable-method: %s\n", enable_method);