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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2022, Microchip
*/
#include <linux/arm-smccc.h>
#include <linux/of.h>
#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");
}
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