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c71572aa54
Add sam_linux_is_optee_available() which allows to know if OP-TEE is available for Linux. This function is used by code which needs to know if we running with OP-TEE available or not. Signed-off-by: Clément Léger <clement.leger@bootlin.com> [claudiu.beznea: edit commit title and message, renamed sam_linux_is_in_normal_world() into sam_linux_is_optee_available()] Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com> Link: https://lore.kernel.org/r/20220606145701.185552-2-clement.leger@bootlin.com
52 lines
1.2 KiB
C
52 lines
1.2 KiB
C
// 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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