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authorMarc Zyngier <marc.zyngier@arm.com>2012-10-05 13:47:39 +0100
committerWill Deacon <will.deacon@arm.com>2013-02-02 15:05:33 +0000
commit2a0ba7388092b07732dc772c042273a3b40d90de (patch)
treed50437e35d98b15749cbf06d28806de15db40f0e /arch/arm/mach-virt/virt.c
parent6c046e405564608dd0889e0938656781550fd70c (diff)
ARM: Dummy Virtual Machine platform support
Add support for the smallest, dumbest possible platform, to be used as a guest for KVM or other hypervisors. It only mandates a GIC and architected timers. Fits nicely with a multiplatform zImage. Uses very little silicon area. Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Nicolas Pitre <nico@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> [will: fixed up conflicts with GIC move to drivers/irqchip/] Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm/mach-virt/virt.c')
-rw-r--r--arch/arm/mach-virt/virt.c54
1 files changed, 54 insertions, 0 deletions
diff --git a/arch/arm/mach-virt/virt.c b/arch/arm/mach-virt/virt.c
new file mode 100644
index 000000000000..d8a84b53fe0c
--- /dev/null
+++ b/arch/arm/mach-virt/virt.c
@@ -0,0 +1,54 @@
+/*
+ * Dummy Virtual Machine - does what it says on the tin.
+ *
+ * Copyright (C) 2012 ARM Ltd
+ * Authors: Will Deacon <will.deacon@arm.com>,
+ * Marc Zyngier <marc.zyngier@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/irqchip.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+
+#include <asm/arch_timer.h>
+#include <asm/mach/arch.h>
+#include <asm/mach/time.h>
+
+static void __init virt_init(void)
+{
+ of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
+}
+
+static void __init virt_timer_init(void)
+{
+ WARN_ON(arch_timer_of_register() != 0);
+ WARN_ON(arch_timer_sched_clock_init() != 0);
+}
+
+static const char *virt_dt_match[] = {
+ "linux,dummy-virt",
+ NULL
+};
+
+static struct sys_timer virt_timer = {
+ .init = virt_timer_init,
+};
+
+DT_MACHINE_START(VIRT, "Dummy Virtual Machine")
+ .init_irq = irqchip_init,
+ .timer = &virt_timer,
+ .init_machine = virt_init,
+ .dt_compat = virt_dt_match,
+MACHINE_END