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- From f0ac5b23039610619ca4a4805528553ecb6bc815 Mon Sep 17 00:00:00 2001
- From: Patrick Delaunay <[email protected]>
- Date: Fri, 15 Dec 2023 11:15:36 +0000
- Subject: [PATCH] nvmem: stm32: add support for STM32MP25 BSEC to control OTP
- data
- On STM32MP25, OTP area may be read/written by using BSEC (boot, security
- and OTP control). The BSEC internal peripheral is only managed by the
- secure world.
- The 12 Kbits of OTP (effective) are organized into the following regions:
- - lower OTP (OTP0 to OTP127) = 4096 lower OTP bits,
- bitwise (1-bit) programmable
- - mid OTP (OTP128 to OTP255) = 4096 middle OTP bits,
- bulk (32-bit) programmable
- - upper OTP (OTP256 to OTP383) = 4096 upper OTP bits,
- bulk (32-bit) programmable,
- only accessible when BSEC is in closed state.
- As HWKEY and ECIES key are only accessible by ROM code;
- only 368 OTP words are managed in this driver (OTP0 to OTP267).
- This patch adds the STM32MP25 configuration for reading and writing
- the OTP data using the OP-TEE BSEC TA services.
- Signed-off-by: Patrick Delaunay <[email protected]>
- Signed-off-by: Srinivas Kandagatla <[email protected]>
- Link: https://lore.kernel.org/r/[email protected]
- Signed-off-by: Greg Kroah-Hartman <[email protected]>
- ---
- drivers/nvmem/stm32-romem.c | 16 ++++++++++++++++
- 1 file changed, 16 insertions(+)
- --- a/drivers/nvmem/stm32-romem.c
- +++ b/drivers/nvmem/stm32-romem.c
- @@ -269,6 +269,19 @@ static const struct stm32_romem_cfg stm3
- .ta = true,
- };
-
- +/*
- + * STM32MP25 BSEC OTP: 3 regions of 32-bits data words
- + * lower OTP (OTP0 to OTP127), bitwise (1-bit) programmable
- + * mid OTP (OTP128 to OTP255), bulk (32-bit) programmable
- + * upper OTP (OTP256 to OTP383), bulk (32-bit) programmable
- + * but no access to HWKEY and ECIES key: limited at OTP367
- + */
- +static const struct stm32_romem_cfg stm32mp25_bsec_cfg = {
- + .size = 368 * 4,
- + .lower = 127,
- + .ta = true,
- +};
- +
- static const struct of_device_id stm32_romem_of_match[] __maybe_unused = {
- { .compatible = "st,stm32f4-otp", }, {
- .compatible = "st,stm32mp15-bsec",
- @@ -276,6 +289,9 @@ static const struct of_device_id stm32_r
- }, {
- .compatible = "st,stm32mp13-bsec",
- .data = (void *)&stm32mp13_bsec_cfg,
- + }, {
- + .compatible = "st,stm32mp25-bsec",
- + .data = (void *)&stm32mp25_bsec_cfg,
- },
- { /* sentinel */ },
- };
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