From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- arch/arm/mach-at91/sam_secure.c | 52 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 52 insertions(+) create mode 100644 arch/arm/mach-at91/sam_secure.c (limited to 'arch/arm/mach-at91/sam_secure.c') 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 +#include + +#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"); +} -- cgit v1.2.3