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Commit 4de3abb3 authored by Will Deacon's avatar Will Deacon
Browse files

ARM: mach-virt: add SMP support using PSCI 



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

Acked-by: default avatarArnd Bergmann <arnd@arndb.de>
Reviewed-by: default avatarNicolas Pitre <nico@linaro.org>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent 2a0ba738

arch/arm/mach-virt/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -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

arch/arm/mach-virt/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -3,3 +3,4 @@ 
#



obj-y					:= virt.o

obj-$(CONFIG_SMP)			+= platsmp.o

arch/arm/mach-virt/platsmp.c

0 → 100644
+58 −0
Original line number Diff line number Diff line 
/*

 * 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,

};

arch/arm/mach-virt/virt.c

+4 −0
Original line number Diff line number Diff line
@@ -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