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ARM: mach-virt: add SMP support using PSCI

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This patch adds support for SMP to mach-virt using the PSCI
infrastructure.

Acked-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Will Deacon 2012-12-13 13:10:40 +00:00
parent 2a0ba73880
commit 4de3abb348
4 changed files with 64 additions and 0 deletions
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1
arch/arm/mach-virt/Kconfig
View file

@ -3,6 +3,7 @@ config ARCH_VIRT
select ARCH_WANT_OPTIONAL_GPIOLIB
select ARM_GIC
select ARM_ARCH_TIMER
select ARM_PSCI
select HAVE_SMP
select CPU_V7
select SPARSE_IRQ

1
arch/arm/mach-virt/Makefile
View file

@ -3,3 +3,4 @@
#
obj-y := virt.o
obj-$(CONFIG_SMP) += platsmp.o

58
arch/arm/mach-virt/platsmp.c Normal file
View file

@ -0,0 +1,58 @@
/*
* Dummy Virtual Machine - does what it says on the tin.
*
* Copyright (C) 2012 ARM Ltd
* Author: Will Deacon <will.deacon@arm.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that 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/of.h>
#include <linux/irqchip/arm-gic.h>
#include <asm/psci.h>
#include <asm/smp_plat.h>
extern void secondary_startup(void);
static void __init virt_smp_init_cpus(void)
{
}
static void __init virt_smp_prepare_cpus(unsigned int max_cpus)
{
}
static int __cpuinit virt_boot_secondary(unsigned int cpu,
struct task_struct *idle)
{
if (psci_ops.cpu_on)
return psci_ops.cpu_on(cpu_logical_map(cpu),
__pa(secondary_startup));
return -ENODEV;
}
static void __cpuinit virt_secondary_init(unsigned int cpu)
{
gic_secondary_init(0);
}
struct smp_operations __initdata virt_smp_ops = {
.smp_init_cpus = virt_smp_init_cpus,
.smp_prepare_cpus = virt_smp_prepare_cpus,
.smp_secondary_init = virt_secondary_init,
.smp_boot_secondary = virt_boot_secondary,
};

4
arch/arm/mach-virt/virt.c
View file

@ -21,6 +21,7 @@
#include <linux/irqchip.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/smp.h>
#include <asm/arch_timer.h>
#include <asm/mach/arch.h>
@ -46,9 +47,12 @@ static struct sys_timer virt_timer = {
.init = virt_timer_init,
};
extern struct smp_operations virt_smp_ops;
DT_MACHINE_START(VIRT, "Dummy Virtual Machine")
.init_irq = irqchip_init,
.timer = &virt_timer,
.init_machine = virt_init,
.smp = smp_ops(virt_smp_ops),
.dt_compat = virt_dt_match,
MACHINE_END