[RFC PATCH] ARM: Make a compile trustzone conditionally

[kmpark@infradead.org (Kyungmin Park)]

From: Kyungmin Park <kyungmin.park@samsung.com>

Some boards can use the trustzone but others can't use trustzone.
However we need to build it simultaneously. To address this issue,
introduce arm trustzone support and use it at each board files.

e.g., In boot_secondary at mach-exynos/platsmp.c

	__raw_writel(virt_to_phys(exynos4_secondary_startup),
		CPU1_BOOT_REG);

	if (trustzone_enabled()) {
		/* Call Exynos specific smc call */
		/* exynos_smc(SMC_CMD_CPU1BOOT, cpu, 0, 0); */
	}

	gic_raise_softirq(cpumask_of(cpu), 1);

	if (pen_release == -1)

Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
---
diff --git a/arch/arm/common/Kconfig b/arch/arm/common/Kconfig
index 283fa1d..16b7047 100644
--- a/arch/arm/common/Kconfig
+++ b/arch/arm/common/Kconfig
@@ -21,6 +21,9 @@ config ARM_VIC_NR
 	  The maximum number of VICs available in the system, for
 	  power management.
 
+config ARM_TRUSTZONE
+	bool
+
 config ICST
 	bool
 
diff --git a/arch/arm/common/Makefile b/arch/arm/common/Makefile
index e8a4e58..5820e49 100644
--- a/arch/arm/common/Makefile
+++ b/arch/arm/common/Makefile
@@ -4,6 +4,7 @@
 
 obj-$(CONFIG_ARM_GIC)		+= gic.o
 obj-$(CONFIG_ARM_VIC)		+= vic.o
+obj-$(CONFIG_ARM_TRUSTZONE)	+= trustzone.o
 obj-$(CONFIG_ICST)		+= icst.o
 obj-$(CONFIG_SA1111)		+= sa1111.o
 obj-$(CONFIG_PCI_HOST_VIA82C505) += via82c505.o
diff --git a/arch/arm/common/trustzone.c b/arch/arm/common/trustzone.c
new file mode 100644
index 0000000..5104a1f
--- /dev/null
+++ b/arch/arm/common/trustzone.c
@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) 2012 Samsung Electronics.
+ *
+ * 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.
+ */
+
+#include <linux/kernel.h>
+
+#include <asm/cache.h>
+
+static bool trustzone_enable __read_mostly = false;
+
+bool trustzone_enabled(void)
+{
+	return trustzone_enable;
+}
+
+void trustzone_set_enable(void)
+{
+	trustzone_enable = true;
+}
diff --git a/arch/arm/include/asm/trustzone.h b/arch/arm/include/asm/trustzone.h
new file mode 100644
index 0000000..126dd22
--- /dev/null
+++ b/arch/arm/include/asm/trustzone.h
@@ -0,0 +1,20 @@
+/*
+ *  Copyright (C) 2012 Samsung Electronics.
+ *
+ * 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.
+ */
+
+#ifndef __ASM_ARM_TRUSTZONE_H
+#define __ASM_ARM_TRUSTZONE_H
+
+#ifdef CONFIG_ARM_TRUSTZONE
+extern bool trustzone_enabled(void);
+extern void trustzone_set_enable(void);
+#else
+#define trustzone_enabled()		(0)
+#define trustzone_set_enable()		do { } while (0)
+#endif
+
+#endif