ARM: mach-virt: add SMP support using PSCI

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>

4 files changed, 64 insertions, 0 deletions

diff --git a/arch/arm/mach-virt/Kconfig b/arch/arm/mach-virt/Kconfig
index a568a2a5bb90..8958f0d896bc 100644
--- a/arch/arm/mach-virt/Kconfig
+++ b/arch/arm/mach-virt/Kconfig
@@ -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
diff --git a/arch/arm/mach-virt/Makefile b/arch/arm/mach-virt/Makefile
index 7ddbfa60227f..042afc1f8c44 100644
--- a/arch/arm/mach-virt/Makefile
+++ b/arch/arm/mach-virt/Makefile
@@ -3,3 +3,4 @@
 #
 
 obj-y                                   := virt.o
+obj-$(CONFIG_SMP)                       += platsmp.o
diff --git a/arch/arm/mach-virt/platsmp.c b/arch/arm/mach-virt/platsmp.c
new file mode 100644
index 000000000000..8badaabe70a1
--- /dev/null
+++ b/arch/arm/mach-virt/platsmp.c
@@ -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,
+};
diff --git a/arch/arm/mach-virt/virt.c b/arch/arm/mach-virt/virt.c
index d8a84b53fe0c..f6ed9cfeb287 100644
--- a/arch/arm/mach-virt/virt.c
+++ b/arch/arm/mach-virt/virt.c
@@ -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