[PATCH v4 3/5] ARM: EXYNOS: Add support for Exynos secure firmware

[Tomasz Figa]

Some Exynos-based boards contain secure firmware and must use firmware
operations to set up some hardware.

This patch adds firmware operations for Exynos secure firmware and a way
for board code and device tree to specify that they must be used.

Example of use:

In board code:

	...MACHINE_START(...)
		/* ... */
		.init_early	= exynos_firmware_init,
		/* ... */
	MACHINE_END

In device tree:

	/ {
		/* ... */

		firmware at 0203F000 {
			compatible = "samsung,secure-firmware";
			reg = <0x0203F000 0x1000>;
		};

		/* ... */
	};

Signed-off-by: Kyungmin Park <kyungmin.park at samsung.com>
Signed-off-by: Tomasz Figa <t.figa at samsung.com>
---
 .../devicetree/bindings/arm/samsung-boards.txt     | 10 ++++
 arch/arm/mach-exynos/Makefile                      |  1 +
 arch/arm/mach-exynos/common.h                      |  2 +
 arch/arm/mach-exynos/firmware.c                    | 70 ++++++++++++++++++++++
 arch/arm/mach-exynos/mach-exynos4-dt.c             |  1 +
 5 files changed, 84 insertions(+)
 create mode 100644 arch/arm/mach-exynos/firmware.c

diff --git a/Documentation/devicetree/bindings/arm/samsung-boards.txt b/Documentation/devicetree/bindings/arm/samsung-boards.txt
index 0bf68be..2168ed3 100644
--- a/Documentation/devicetree/bindings/arm/samsung-boards.txt
+++ b/Documentation/devicetree/bindings/arm/samsung-boards.txt
@@ -6,3 +6,13 @@ Required root node properties:
     - compatible = should be one or more of the following.
         (a) "samsung,smdkv310" - for Samsung's SMDKV310 eval board.
         (b) "samsung,exynos4210"  - for boards based on Exynos4210 SoC.
+
+Optional:
+    - firmware node, specifying presence and type of secure firmware:
+        - compatible: only "samsung,secure-firmware" is currently supported
+        - reg: address of non-secure SYSRAM used for communication with firmware
+
+	firmware at 0203F000 {
+		compatible = "samsung,secure-firmware";
+		reg = <0x0203F000 0x1000>;
+	};
diff --git a/arch/arm/mach-exynos/Makefile b/arch/arm/mach-exynos/Makefile
index a031012..685e4a7 100644
--- a/arch/arm/mach-exynos/Makefile
+++ b/arch/arm/mach-exynos/Makefile
@@ -31,6 +31,7 @@ obj-$(CONFIG_EXYNOS4_MCT)	+= mct.o
 obj-$(CONFIG_HOTPLUG_CPU)	+= hotplug.o
 
 obj-$(CONFIG_ARCH_EXYNOS)	+= exynos-smc.o
+obj-$(CONFIG_ARCH_EXYNOS)	+= firmware.o
 
 plus_sec := $(call as-instr,.arch_extension sec,+sec)
 AFLAGS_exynos-smc.o		:=-Wa,-march=armv7-a$(plus_sec)
diff --git a/arch/arm/mach-exynos/common.h b/arch/arm/mach-exynos/common.h
index dac146d..5f1d393 100644
--- a/arch/arm/mach-exynos/common.h
+++ b/arch/arm/mach-exynos/common.h
@@ -22,6 +22,8 @@ void exynos4_restart(char mode, const char *cmd);
 void exynos5_restart(char mode, const char *cmd);
 void exynos_init_late(void);
 
+void exynos_firmware_init(void);
+
 #ifdef CONFIG_PM_GENERIC_DOMAINS
 int exynos_pm_late_initcall(void);
 #else
diff --git a/arch/arm/mach-exynos/firmware.c b/arch/arm/mach-exynos/firmware.c
new file mode 100644
index 0000000..88e3eed
--- /dev/null
+++ b/arch/arm/mach-exynos/firmware.c
@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) 2012 Samsung Electronics.
+ * Kyungmin Park <kyungmin.park at samsung.com>
+ * Tomasz Figa <t.figa at 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/io.h>
+#include <linux/init.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+
+#include <asm/firmware.h>
+
+#include <mach/map.h>
+
+#include "smc.h"
+
+static int exynos_do_idle(void)
+{
+        exynos_smc(SMC_CMD_SLEEP, 0, 0, 0);
+        return 0;
+}
+
+static int exynos_cpu_boot(int cpu)
+{
+	exynos_smc(SMC_CMD_CPU1BOOT, cpu, 0, 0);
+	return 0;
+}
+
+static int exynos_set_cpu_boot_addr(int cpu, unsigned long boot_addr)
+{
+	void __iomem *boot_reg = S5P_VA_SYSRAM_NS + 0x1c + 4*cpu;
+
+	__raw_writel(boot_addr, boot_reg);
+	return 0;
+}
+
+static const struct firmware_ops exynos_firmware_ops = {
+	.do_idle		= exynos_do_idle,
+	.set_cpu_boot_addr	= exynos_set_cpu_boot_addr,
+	.cpu_boot		= exynos_cpu_boot,
+};
+
+void __init exynos_firmware_init(void)
+{
+	if (of_have_populated_dt()) {
+		struct device_node *nd;
+		const __be32 *addr;
+
+		nd = of_find_compatible_node(NULL, NULL,
+						"samsung,secure-firmware");
+		if (!nd)
+			return;
+
+		addr = of_get_address(nd, 0, NULL, NULL);
+		if (!addr) {
+			pr_err("%s: No address specified.\n", __func__);
+			return;
+		}
+	}
+
+	pr_info("Running under secure firmware.\n");
+
+	register_firmware_ops(&exynos_firmware_ops);
+}
diff --git a/arch/arm/mach-exynos/mach-exynos4-dt.c b/arch/arm/mach-exynos/mach-exynos4-dt.c
index 8858068..3f967e5 100644
--- a/arch/arm/mach-exynos/mach-exynos4-dt.c
+++ b/arch/arm/mach-exynos/mach-exynos4-dt.c
@@ -107,6 +107,7 @@ DT_MACHINE_START(EXYNOS4210_DT, "Samsung Exynos4 (Flattened Device Tree)")
 	.init_irq	= exynos4_init_irq,
 	.map_io		= exynos4_dt_map_io,
 	.handle_irq	= gic_handle_irq,
+	.init_early	= exynos_firmware_init,
 	.init_machine	= exynos4_dt_machine_init,
 	.init_late	= exynos_init_late,
 	.timer		= &exynos4_timer,
-- 
1.8.0