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-rw-r--r--arch/arm/mach-at91/sam_secure.c52
1 files changed, 52 insertions, 0 deletions
diff --git a/arch/arm/mach-at91/sam_secure.c b/arch/arm/mach-at91/sam_secure.c
new file mode 100644
index 0000000000..f7789cbe28
--- /dev/null
+++ b/arch/arm/mach-at91/sam_secure.c
@@ -0,0 +1,52 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2022, Microchip
+ */
+
+#include <linux/arm-smccc.h>
+#include <linux/of.h>
+
+#include "sam_secure.h"
+
+static bool optee_available;
+
+#define SAM_SIP_SMC_STD_CALL_VAL(func_num) \
+ ARM_SMCCC_CALL_VAL(ARM_SMCCC_STD_CALL, ARM_SMCCC_SMC_32, \
+ ARM_SMCCC_OWNER_SIP, (func_num))
+
+struct arm_smccc_res sam_smccc_call(u32 fn, u32 arg0, u32 arg1)
+{
+ struct arm_smccc_res res = {.a0 = -1};
+
+ if (WARN_ON(!optee_available))
+ return res;
+
+ arm_smccc_smc(SAM_SIP_SMC_STD_CALL_VAL(fn), arg0, arg1, 0, 0, 0, 0, 0,
+ &res);
+
+ return res;
+}
+
+bool sam_linux_is_optee_available(void)
+{
+ /* If optee has been detected, then we are running in normal world */
+ return optee_available;
+}
+
+void __init sam_secure_init(void)
+{
+ struct device_node *np;
+
+ /*
+ * We only check that the OP-TEE node is present and available. The
+ * OP-TEE kernel driver is not needed for the type of interaction made
+ * with OP-TEE here so the driver's status is not checked.
+ */
+ np = of_find_node_by_path("/firmware/optee");
+ if (np && of_device_is_available(np))
+ optee_available = true;
+ of_node_put(np);
+
+ if (optee_available)
+ pr_info("Running under OP-TEE firmware\n");
+}