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  */
16 int 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  */
26 void 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  */
38 int 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  */
52 int 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 
57 static inline int stm32_bsec_optee_ta_open(struct tee_context **ctx)
58 {
59 	return -EOPNOTSUPP;
60 }
61 
62 static inline void stm32_bsec_optee_ta_close(void *ctx)
63 {
64 }
65 
66 static 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 
73 static 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