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 {
compatible = "samsung,secure-firmware";
};
/* ... */
};
This is a follow-up on the patch by Kyungmin Park:
[PATCH v5 2/2] ARM: EXYNOS: SMC instruction (aka firmware) support
http://thread.gmane.org/gmane.linux.ports.arm.kernel/183608/focus=184109
Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
Signed-off-by: Tomasz Figa <t.figa@xxxxxxxxxxx>
---
.../devicetree/bindings/arm/samsung-boards.txt | 8 ++++
arch/arm/mach-exynos/Makefile | 1 +
arch/arm/mach-exynos/common.h | 2 +
arch/arm/mach-exynos/firmware.c | 52 ++++++++++++++++++++++
arch/arm/mach-exynos/mach-exynos4-dt.c | 1 +
5 files changed, 64 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..f447059 100644
--- a/Documentation/devicetree/bindings/arm/samsung-boards.txt
+++ b/Documentation/devicetree/bindings/arm/samsung-boards.txt
@@ -6,3 +6,11 @@ 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, currently
+ supported value of compatible property is "samsung,secure-firmware":
+
+ firmware {
+ compatible = "samsung,secure-firmware";
+ };
diff --git a/arch/arm/mach-exynos/Makefile b/arch/arm/mach-exynos/Makefile
index 997864b..9451637 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 d7f28ca..358f6a5 100644
--- a/arch/arm/mach-exynos/common.h
+++ b/arch/arm/mach-exynos/common.h
@@ -21,6 +21,8 @@ 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..3f3641d
--- /dev/null
+++ b/arch/arm/mach-exynos/firmware.c
@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2012 Samsung Electronics.
+ * Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
+ * Tomasz Figa <t.figa@xxxxxxxxxxx>
+ *
+ * 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/init.h>
+#include <linux/of.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 void exynos_cpu_boot(int cpu)
+{
+ exynos_smc(SMC_CMD_CPU1BOOT, cpu, 0, 0);
+}
+
+static void __iomem *exynos_cpu_boot_reg(int cpu)
+{
+ return S5P_VA_SYSRAM_NS + 0x1c + 4*cpu;
+}
+
+static const struct firmware_ops exynos_firmware_ops __initdata = {
+ .do_idle = exynos_do_idle,
+ .cpu_boot = exynos_cpu_boot,
+ .cpu_boot_reg = exynos_cpu_boot_reg,
+};
+
+void __init exynos_firmware_init(void)
+{
+ if (of_have_populated_dt() &&
+ !of_find_compatible_node(NULL, NULL, "samsung,secure-firmware"))
+ 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 5c48c82..e0827b3 100644
--- a/arch/arm/mach-exynos/mach-exynos4-dt.c
+++ b/arch/arm/mach-exynos/mach-exynos4-dt.c
@@ -116,6 +116,7 @@ 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,
--
1.7.12
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