ARM: Dummy Virtual Machine platform support
Marc Zyngier [Fri, 5 Oct 2012 12:47:39 +0000 (13:47 +0100)]
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>

arch/arm/Kconfig
arch/arm/Makefile
arch/arm/mach-virt/Kconfig [new file with mode: 0644]
arch/arm/mach-virt/Makefile [new file with mode: 0644]
arch/arm/mach-virt/virt.c [new file with mode: 0644]

index c204413..b7562a7 100644 (file)
@@ -1128,6 +1128,8 @@ source "arch/arm/mach-versatile/Kconfig"
 source "arch/arm/mach-vexpress/Kconfig"
 source "arch/arm/plat-versatile/Kconfig"
 
+source "arch/arm/mach-virt/Kconfig"
+
 source "arch/arm/mach-vt8500/Kconfig"
 
 source "arch/arm/mach-w90x900/Kconfig"
index 30c443c..ea4f481 100644 (file)
@@ -194,6 +194,7 @@ machine-$(CONFIG_ARCH_SOCFPGA)              += socfpga
 machine-$(CONFIG_ARCH_SPEAR13XX)       += spear13xx
 machine-$(CONFIG_ARCH_SPEAR3XX)                += spear3xx
 machine-$(CONFIG_MACH_SPEAR600)                += spear6xx
+machine-$(CONFIG_ARCH_VIRT)            += virt
 machine-$(CONFIG_ARCH_ZYNQ)            += zynq
 machine-$(CONFIG_ARCH_SUNXI)           += sunxi
 
diff --git a/arch/arm/mach-virt/Kconfig b/arch/arm/mach-virt/Kconfig
new file mode 100644 (file)
index 0000000..a568a2a
--- /dev/null
@@ -0,0 +1,9 @@
+config ARCH_VIRT
+       bool "Dummy Virtual Machine" if ARCH_MULTI_V7
+       select ARCH_WANT_OPTIONAL_GPIOLIB
+       select ARM_GIC
+       select ARM_ARCH_TIMER
+       select HAVE_SMP
+       select CPU_V7
+       select SPARSE_IRQ
+       select USE_OF
diff --git a/arch/arm/mach-virt/Makefile b/arch/arm/mach-virt/Makefile
new file mode 100644 (file)
index 0000000..7ddbfa6
--- /dev/null
@@ -0,0 +1,5 @@
+#
+# Makefile for the linux kernel.
+#
+
+obj-y                                  := virt.o
diff --git a/arch/arm/mach-virt/virt.c b/arch/arm/mach-virt/virt.c
new file mode 100644 (file)
index 0000000..d8a84b5
--- /dev/null
@@ -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