[PATCH v5 1/2] ARM: Make a compile firmware conditionally

[kmpark@infradead.org (Kyungmin Park)]

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

Some boards can use the firmware at trustzone but others can't use this.
However we need to build it simultaneously. To address this issue,
introduce arm firmware 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 (IS_ENABLED(CONFIG_ARM_FIRMWARE)) {
                /* Call Exynos specific smc call */
                do_firmware_op(cpu_boot, cpu);
        }

        gic_raise_softirq(cpumask_of(cpu), 1);

        if (pen_release == -1)

e.g., exynos4412 based board

static void __init board_init_early(void)
{
        exynos_firmware_init();
}

TODO
        1. DT support.
        2. call firmware init by smp_ops.

Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
---
Changelog v4
	use call_firmware_op commented by Tomasz Figa.
	remove useless core_initcall
	
diff --git a/arch/arm/common/Kconfig b/arch/arm/common/Kconfig
index 283fa1d..5b097ca 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_FIRMWARE
+	bool
+
 config ICST
 	bool
 
diff --git a/arch/arm/common/Makefile b/arch/arm/common/Makefile
index e8a4e58..4af6568 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-$(CONFIG_ARM_FIRMWARE)	+= firmware.o
 obj-$(CONFIG_ICST)		+= icst.o
 obj-$(CONFIG_SA1111)		+= sa1111.o
 obj-$(CONFIG_PCI_HOST_VIA82C505) += via82c505.o
diff --git a/arch/arm/common/firmware.c b/arch/arm/common/firmware.c
new file mode 100644
index 0000000..e375e9f
--- /dev/null
+++ b/arch/arm/common/firmware.c
@@ -0,0 +1,25 @@
+/*
+ *  Copyright (C) 2012 Samsung Electronics.
+ *  Kyungmin Park <kyungmin.park@samsung.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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/suspend.h>
+
+#include <asm/firmware.h>
+
+static void cpu_boot(int cpu)
+{
+	/* Do nothing */
+}
+
+static struct firmware_ops default_firmware_ops = {
+	.do_idle		= cpu_do_idle,
+	.cpu_boot		= cpu_boot,
+};
+
+struct firmware_ops *firmware_ops = &default_firmware_ops;
diff --git a/arch/arm/include/asm/firmware.h b/arch/arm/include/asm/firmware.h
new file mode 100644
index 0000000..99c97ff
--- /dev/null
+++ b/arch/arm/include/asm/firmware.h
@@ -0,0 +1,27 @@
+/*
+ *  Copyright (C) 2012 Samsung Electronics.
+ *  Kyungmin Park <kyungmin.park@samsung.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.
+ */
+
+#ifndef __ASM_ARM_FIRMWARE_H
+#define __ASM_ARM_FIRMWARE_H
+
+struct firmware_ops {
+	int	(*do_idle)(void);
+	void	(*cpu_boot)(int cpu);
+};
+
+extern struct firmware_ops *firmware_ops;
+
+#ifdef CONFIG_ARM_FIRMWARE
+#define call_firmware_op(op, ...)					\
+	((firmware_ops->op) ? firmware_ops->op(__VA_ARGS__) : 0)
+#else
+#define call_firmware_op(op, ...)		do { } while (0)
+#endif
+
+#endif