| 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
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| 2 | /* |
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| 3 | * Copyright (C) 2022, Microchip |
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| 4 | */ |
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| 5 | |
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| 6 | #include <linux/arm-smccc.h> |
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| 7 | #include <linux/of.h> |
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| 8 | |
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| 9 | #include "sam_secure.h" |
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| 10 | |
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| 11 | static bool optee_available; |
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| 12 | |
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| 13 | #define SAM_SIP_SMC_STD_CALL_VAL(func_num) \ |
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| 14 | ARM_SMCCC_CALL_VAL(ARM_SMCCC_STD_CALL, ARM_SMCCC_SMC_32, \ |
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| 15 | ARM_SMCCC_OWNER_SIP, (func_num)) |
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| 16 | |
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| 17 | struct arm_smccc_res sam_smccc_call(u32 fn, u32 arg0, u32 arg1) |
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| 18 | { |
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| 19 | struct arm_smccc_res res = {.a0 = -1}; |
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| 20 | |
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| 21 | if (WARN_ON(!optee_available)) |
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| 22 | return res; |
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| 23 | |
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| 24 | arm_smccc_smc(SAM_SIP_SMC_STD_CALL_VAL(fn), arg0, arg1, 0, 0, 0, 0, 0, |
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| 25 | &res); |
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| 26 | |
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| 27 | return res; |
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| 28 | } |
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| 29 | |
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| 30 | bool sam_linux_is_optee_available(void) |
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| 31 | { |
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| 32 | /* If optee has been detected, then we are running in normal world */ |
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| 33 | return optee_available; |
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| 34 | } |
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| 35 | |
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| 36 | void __init sam_secure_init(void) |
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| 37 | { |
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| 38 | struct device_node *np; |
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| 39 | |
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| 40 | /* |
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| 41 | * We only check that the OP-TEE node is present and available. The |
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| 42 | * OP-TEE kernel driver is not needed for the type of interaction made |
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| 43 | * with OP-TEE here so the driver's status is not checked. |
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| 44 | */ |
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| 45 | np = of_find_node_by_path(path: "/firmware/optee" ); |
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| 46 | if (np && of_device_is_available(device: np)) |
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| 47 | optee_available = true; |
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| 48 | of_node_put(node: np); |
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| 49 | |
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| 50 | if (optee_available) |
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| 51 | pr_info("Running under OP-TEE firmware\n" ); |
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| 52 | } |
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| 53 | |
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