89 lines
2.4 KiB
C
89 lines
2.4 KiB
C
/*
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* Copyright 2010-2011 Calxeda, Inc.
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* Based on platsmp.c, Copyright (C) 2002 ARM Ltd.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/init.h>
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#include <linux/smp.h>
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#include <linux/io.h>
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#include <asm/smp_scu.h>
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#include <asm/hardware/gic.h>
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#include "core.h"
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extern void secondary_startup(void);
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static void __cpuinit highbank_secondary_init(unsigned int cpu)
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{
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gic_secondary_init(0);
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}
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static int __cpuinit highbank_boot_secondary(unsigned int cpu, struct task_struct *idle)
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{
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gic_raise_softirq(cpumask_of(cpu), 0);
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return 0;
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}
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/*
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* Initialise the CPU possible map early - this describes the CPUs
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* which may be present or become present in the system.
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*/
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static void __init highbank_smp_init_cpus(void)
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{
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unsigned int i, ncores;
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ncores = scu_get_core_count(scu_base_addr);
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/* sanity check */
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if (ncores > NR_CPUS) {
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printk(KERN_WARNING
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"highbank: no. of cores (%d) greater than configured "
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"maximum of %d - clipping\n",
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ncores, NR_CPUS);
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ncores = NR_CPUS;
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}
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for (i = 0; i < ncores; i++)
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set_cpu_possible(i, true);
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set_smp_cross_call(gic_raise_softirq);
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}
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static void __init highbank_smp_prepare_cpus(unsigned int max_cpus)
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{
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int i;
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scu_enable(scu_base_addr);
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/*
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* Write the address of secondary startup into the jump table
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* The cores are in wfi and wait until they receive a soft interrupt
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* and a non-zero value to jump to. Then the secondary CPU branches
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* to this address.
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*/
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for (i = 1; i < max_cpus; i++)
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highbank_set_cpu_jump(i, secondary_startup);
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}
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struct smp_operations highbank_smp_ops __initdata = {
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.smp_init_cpus = highbank_smp_init_cpus,
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.smp_prepare_cpus = highbank_smp_prepare_cpus,
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.smp_secondary_init = highbank_secondary_init,
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.smp_boot_secondary = highbank_boot_secondary,
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#ifdef CONFIG_HOTPLUG_CPU
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.cpu_die = highbank_cpu_die,
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#endif
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};
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