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0c9fd82117
Since OP-TEE now has a more complete support for sama5d2, add necessary code to perform SMC calls. The detection of OP-TEE is based on a specific device-tree node path (/firmware/optee) such has done by some other SoC. A check is added to avoid doing SMC calls without having OP-TEE. Signed-off-by: Clément Léger <clement.leger@bootlin.com> Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com> Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>
47 lines
1.0 KiB
C
47 lines
1.0 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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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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