ARM: new platform for Energy Micro's EFM32 Cortex-M3 SoCs

There are still some missing parts (e.g. board support, device trees),
but with these bits added on top of this patch I can successfully boot a
EFM32GG-DK3750 board that uses an EFM32GG990F1024.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

arch/arm/mach-efm32/Makefile

@@ -0,0 +1 @@
+obj-y += dtmachine.o

arch/arm/mach-efm32/Makefile.boot

@@ -0,0 +1,3 @@
+# Empty file waiting for deletion once Makefile.boot isn't needed any more.
+# Patch waits for application at
+# http://www.arm.linux.org.uk/developer/patches/viewpatch.php?id=7889/1 .

arch/arm/mach-efm32/dtmachine.c

@@ -0,0 +1,15 @@
+#include <linux/kernel.h>
+
+#include <asm/v7m.h>
+
+#include <asm/mach/arch.h>
+
+static const char *const efm32gg_compat[] __initconst = {
+	"efm32,dk3750",
+	NULL
+};
+
+DT_MACHINE_START(EFM32DT, "EFM32 (Device Tree Support)")
+	.dt_compat = efm32gg_compat,
+	.restart = armv7m_restart,
+MACHINE_END

arch/arm/mach-efm32/include/mach/entry-macro.S

@@ -0,0 +1,4 @@
+/*
+ * Empty file waiting for deletion once <mach/entry-macro.S> isn't needed any
+ * more. Patch "ARM: v7-M: drop using mach/entry-macro.S" sitting in next.
+ */

arch/arm/mach-efm32/include/mach/timex.h

@@ -0,0 +1,3 @@
+/*
+ * Empty file waiting for deletion once <mach/timex.h> isn't needed any more.
+ */