2 * Spin Table SMP initialisation
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/init.h>
21 #include <linux/smp.h>
23 #include <asm/cacheflush.h>
24 #include <asm/cpu_ops.h>
26 static phys_addr_t cpu_release_addr[NR_CPUS];
28 static int smp_spin_table_cpu_init(struct device_node *dn, unsigned int cpu)
31 * Determine the address from which the CPU is polling.
33 if (of_property_read_u64(dn, "cpu-release-addr",
34 &cpu_release_addr[cpu])) {
35 pr_err("CPU %d: missing or invalid cpu-release-addr property\n",
44 static int smp_spin_table_cpu_prepare(unsigned int cpu)
48 if (!cpu_release_addr[cpu])
51 release_addr = __va(cpu_release_addr[cpu]);
52 release_addr[0] = (void *)__pa(secondary_holding_pen);
53 __flush_dcache_area(release_addr, sizeof(release_addr[0]));
56 * Send an event to wake up the secondary CPU.
63 const struct cpu_operations smp_spin_table_ops = {
65 .cpu_init = smp_spin_table_cpu_init,
66 .cpu_prepare = smp_spin_table_cpu_prepare,