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52 lines
1.2 KiB
52 lines
1.2 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (C) 2022, Microchip |
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*/ |
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#include <linux/arm-smccc.h> |
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#include <linux/of.h> |
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#include "sam_secure.h" |
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static bool optee_available; |
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#define SAM_SIP_SMC_STD_CALL_VAL(func_num) \ |
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ARM_SMCCC_CALL_VAL(ARM_SMCCC_STD_CALL, ARM_SMCCC_SMC_32, \ |
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ARM_SMCCC_OWNER_SIP, (func_num)) |
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struct arm_smccc_res sam_smccc_call(u32 fn, u32 arg0, u32 arg1) |
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{ |
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struct arm_smccc_res res = {.a0 = -1}; |
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if (WARN_ON(!optee_available)) |
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return res; |
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arm_smccc_smc(SAM_SIP_SMC_STD_CALL_VAL(fn), arg0, arg1, 0, 0, 0, 0, 0, |
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&res); |
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return res; |
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} |
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bool sam_linux_is_optee_available(void) |
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{ |
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/* If optee has been detected, then we are running in normal world */ |
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return optee_available; |
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} |
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void __init sam_secure_init(void) |
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{ |
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struct device_node *np; |
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/* |
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* We only check that the OP-TEE node is present and available. The |
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* OP-TEE kernel driver is not needed for the type of interaction made |
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* with OP-TEE here so the driver's status is not checked. |
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*/ |
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np = of_find_node_by_path("/firmware/optee"); |
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if (np && of_device_is_available(np)) |
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optee_available = true; |
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of_node_put(np); |
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if (optee_available) |
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pr_info("Running under OP-TEE firmware\n"); |
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}
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