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