1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * OP-TEE STM32MP BSEC PTA interface, used by STM32 ROMEM driver
5  * Copyright (C) 2022, STMicroelectronics - All Rights Reserved
10 #include "stm32-bsec-optee-ta.h"
15  * [in]		value[0].a		OTP start offset in byte
16  * [in]		value[0].b		Access type (0:shadow, 1:fuse, 2:lock)
21  * TEE_SUCCESS - Invoke command success
22  * TEE_ERROR_BAD_PARAMETERS - Incorrect input param
23  * TEE_ERROR_ACCESS_DENIED - OTP not accessible by caller
30  * [in]		value[0].a		OTP start offset in byte
31  * [in]		value[0].b		Access type (0:shadow, 1:fuse, 2:lock)
36  * TEE_SUCCESS - Invoke command success
37  * TEE_ERROR_BAD_PARAMETERS - Incorrect input param
38  * TEE_ERROR_ACCESS_DENIED - OTP not accessible by caller
42 /* value of PTA_BSEC access type = value[in] b */
50 /* OP-TEE STM32MP BSEC TA UUID */
62 	/* Currently this driver only supports GP compliant, OP-TEE based TA */  in stm32_bsec_optee_ta_match()
63 	if ((ver->impl_id == TEE_IMPL_ID_OPTEE) &&  in stm32_bsec_optee_ta_match()
64 		(ver->gen_caps & TEE_GEN_CAP_GP))  in stm32_bsec_optee_ta_match()
70 /* Open a session to OP-TEE for STM32MP BSEC TA */
86 			rc = -EINVAL;  in stm32_bsec_ta_open_session()
94 /* close a session to OP-TEE for STM32MP BSEC TA */
100 /* stm32_bsec_optee_ta_open() - initialize the STM32MP BSEC TA */
111 		if (rc == -ENOENT)  in stm32_bsec_optee_ta_open()
112 			return -EPROBE_DEFER;  in stm32_bsec_optee_ta_open()
132 /* stm32_bsec_optee_ta_open() - release the PTA STM32MP BSEC TA */
138 /* stm32_bsec_optee_ta_read() - nvmem read access using PTA client driver */
146 	u32 start, num_bytes;  in stm32_bsec_optee_ta_read()  local
162 	start = ALIGN_DOWN(offset, 4);  in stm32_bsec_optee_ta_read()
163 	num_bytes = round_up(offset + bytes - start, 4);  in stm32_bsec_optee_ta_read()
165 	param[0].u.value.a = start;  in stm32_bsec_optee_ta_read()
166 	param[0].u.value.b = SHADOW_ACCESS;  in stm32_bsec_optee_ta_read()
183 			ret = -EIO;  in stm32_bsec_optee_ta_read()
204 /* stm32_bsec_optee_ta_write() - nvmem write access using PTA client driver */
218 	/* Allow only writing complete 32-bits aligned words */  in stm32_bsec_optee_ta_write()
220 		return -EINVAL;  in stm32_bsec_optee_ta_write()
230 	param[0].u.value.a = offset;  in stm32_bsec_optee_ta_write()
231 	param[0].u.value.b = FUSE_ACCESS;  in stm32_bsec_optee_ta_write()
258 			ret = -EIO;  in stm32_bsec_optee_ta_write()
264 		u32 start, nb_lock;  in stm32_bsec_optee_ta_write()  local
272 		start = max_t(u32, offset, lower * 4);  in stm32_bsec_optee_ta_write()
273 		nb_lock = (offset + bytes - start) / 4;  in stm32_bsec_optee_ta_write()
275 		param[0].u.value.a = start;  in stm32_bsec_optee_ta_write()
276 		param[0].u.value.b = LOCK_ACCESS;  in stm32_bsec_optee_ta_write()
286 				ret = -EIO;  in stm32_bsec_optee_ta_write()
289 			 start / 4, start / 4 + nb_lock, ret);  in stm32_bsec_optee_ta_write()