xref: /kernel/linux/linux-6.6/drivers/firmware/arm_ffa/smccc.c (revision 62306a36)
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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2021 ARM Ltd.
4 */
5
6#include <linux/printk.h>
7
8#include "common.h"
9
10static void __arm_ffa_fn_smc(ffa_value_t args, ffa_value_t *res)
11{
12	arm_smccc_1_2_smc(&args, res);
13}
14
15static void __arm_ffa_fn_hvc(ffa_value_t args, ffa_value_t *res)
16{
17	arm_smccc_1_2_hvc(&args, res);
18}
19
20int __init ffa_transport_init(ffa_fn **invoke_ffa_fn)
21{
22	enum arm_smccc_conduit conduit;
23
24	if (arm_smccc_get_version() < ARM_SMCCC_VERSION_1_2)
25		return -EOPNOTSUPP;
26
27	conduit = arm_smccc_1_1_get_conduit();
28	if (conduit == SMCCC_CONDUIT_NONE) {
29		pr_err("%s: invalid SMCCC conduit\n", __func__);
30		return -EOPNOTSUPP;
31	}
32
33	if (conduit == SMCCC_CONDUIT_SMC)
34		*invoke_ffa_fn = __arm_ffa_fn_smc;
35	else
36		*invoke_ffa_fn = __arm_ffa_fn_hvc;
37
38	return 0;
39}
40

Indexes created Thu Nov 07 10:32:03 CST 2024