1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * OP-TEE STM32MP BSEC PTA interface, used by STM32 ROMEM driver
4 *
5 * Copyright (C) 2022, STMicroelectronics - All Rights Reserved
6 */
7
8#if IS_ENABLED(CONFIG_NVMEM_STM32_BSEC_OPTEE_TA)
9/**
10 * stm32_bsec_optee_ta_open() - initialize the STM32 BSEC TA
11 * @ctx: the OP-TEE context on success
12 *
13 * Return:
14 * On success, 0. On failure, -errno.
15 */
16int stm32_bsec_optee_ta_open(struct tee_context **ctx);
17
18/**
19 * stm32_bsec_optee_ta_close() - release the STM32 BSEC TA
20 * @ctx: the OP-TEE context
21 *
22 * This function used to clean the OP-TEE resources initialized in
23 * stm32_bsec_optee_ta_open(); it can be used as callback to
24 * devm_add_action_or_reset()
25 */
26void stm32_bsec_optee_ta_close(void *ctx);
27
28/**
29 * stm32_bsec_optee_ta_read() - nvmem read access using TA client driver
30 * @ctx: the OP-TEE context provided by stm32_bsec_optee_ta_open
31 * @offset: nvmem offset
32 * @buf: buffer to fill with nvem values
33 * @bytes: number of bytes to read
34 *
35 * Return:
36 * On success, 0. On failure, -errno.
37 */
38int stm32_bsec_optee_ta_read(struct tee_context *ctx, unsigned int offset,
39 void *buf, size_t bytes);
40
41/**
42 * stm32_bsec_optee_ta_write() - nvmem write access using TA client driver
43 * @ctx: the OP-TEE context provided by stm32_bsec_optee_ta_open
44 * @lower: number of lower OTP, not protected by ECC
45 * @offset: nvmem offset
46 * @buf: buffer with nvem values
47 * @bytes: number of bytes to write
48 *
49 * Return:
50 * On success, 0. On failure, -errno.
51 */
52int stm32_bsec_optee_ta_write(struct tee_context *ctx, unsigned int lower,
53 unsigned int offset, void *buf, size_t bytes);
54
55#else
56
57static inline int stm32_bsec_optee_ta_open(struct tee_context **ctx)
58{
59 return -EOPNOTSUPP;
60}
61
62static inline void stm32_bsec_optee_ta_close(void *ctx)
63{
64}
65
66static inline int stm32_bsec_optee_ta_read(struct tee_context *ctx,
67 unsigned int offset, void *buf,
68 size_t bytes)
69{
70 return -EOPNOTSUPP;
71}
72
73static inline int stm32_bsec_optee_ta_write(struct tee_context *ctx,
74 unsigned int lower,
75 unsigned int offset, void *buf,
76 size_t bytes)
77{
78 return -EOPNOTSUPP;
79}
80#endif /* CONFIG_NVMEM_STM32_BSEC_OPTEE_TA */
81

source code of linux/drivers/nvmem/stm32-bsec-optee-ta.h