2 * Copyright 2010-2011 Calxeda, Inc.
3 * Based on platsmp.c, Copyright (C) 2002 ARM Ltd.
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * You should have received a copy of the GNU General Public License along with
15 * this program. If not, see <http://www.gnu.org/licenses/>.
17 #include <linux/init.h>
18 #include <linux/smp.h>
21 #include <asm/smp_scu.h>
22 #include <asm/hardware/gic.h>
26 extern void secondary_startup(void);
28 static void __cpuinit highbank_secondary_init(unsigned int cpu)
30 gic_secondary_init(0);
33 static int __cpuinit highbank_boot_secondary(unsigned int cpu, struct task_struct *idle)
35 gic_raise_softirq(cpumask_of(cpu), 0);
40 * Initialise the CPU possible map early - this describes the CPUs
41 * which may be present or become present in the system.
43 static void __init highbank_smp_init_cpus(void)
45 unsigned int i, ncores = 4;
48 if (ncores > NR_CPUS) {
50 "highbank: no. of cores (%d) greater than configured "
51 "maximum of %d - clipping\n",
56 for (i = 0; i < ncores; i++)
57 set_cpu_possible(i, true);
59 set_smp_cross_call(gic_raise_softirq);
62 static void __init highbank_smp_prepare_cpus(unsigned int max_cpus)
67 scu_enable(scu_base_addr);
70 * Write the address of secondary startup into the jump table
71 * The cores are in wfi and wait until they receive a soft interrupt
72 * and a non-zero value to jump to. Then the secondary CPU branches
75 for (i = 1; i < max_cpus; i++)
76 highbank_set_cpu_jump(i, secondary_startup);
79 struct smp_operations highbank_smp_ops __initdata = {
80 .smp_init_cpus = highbank_smp_init_cpus,
81 .smp_prepare_cpus = highbank_smp_prepare_cpus,
82 .smp_secondary_init = highbank_secondary_init,
83 .smp_boot_secondary = highbank_boot_secondary,
84 #ifdef CONFIG_HOTPLUG_CPU
85 .cpu_die = highbank_cpu_die,