1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (C) 2022, Microchip
6 #include <linux/arm-smccc.h>
9 #include "sam_secure.h"
11 static bool optee_available;
13 #define SAM_SIP_SMC_STD_CALL_VAL(func_num) \
14 ARM_SMCCC_CALL_VAL(ARM_SMCCC_STD_CALL, ARM_SMCCC_SMC_32, \
15 ARM_SMCCC_OWNER_SIP, (func_num))
17 struct arm_smccc_res sam_smccc_call(u32 fn, u32 arg0, u32 arg1)
19 struct arm_smccc_res res = {.a0 = -1};
21 if (WARN_ON(!optee_available))
24 arm_smccc_smc(SAM_SIP_SMC_STD_CALL_VAL(fn), arg0, arg1, 0, 0, 0, 0, 0,
30 void __init sam_secure_init(void)
32 struct device_node *np;
35 * We only check that the OP-TEE node is present and available. The
36 * OP-TEE kernel driver is not needed for the type of interaction made
37 * with OP-TEE here so the driver's status is not checked.
39 np = of_find_node_by_path("/firmware/optee");
40 if (np && of_device_is_available(np))
41 optee_available = true;
45 pr_info("Running under OP-TEE firmware\n");