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Date: Thu, 20 Aug 2026 00:15:56 +0530 Subject: [PATCH v38 1/7] Documentation/firmware: add imx/se to other_interfaces Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260820-imx-se-if-v38-1-5df4a4cff736@nxp.com> References: <20260820-imx-se-if-v38-0-5df4a4cff736@nxp.com> In-Reply-To: <20260820-imx-se-if-v38-0-5df4a4cff736@nxp.com> To: Jonathan Corbet , Shuah Khan , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Frank Li , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , Pankaj Gupta Cc: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1787165160; l=7403; i=pankaj.gupta@nxp.com; s=20260817; h=from:subject:message-id; bh=ZSAmXRvPjYNeGEa/I9hefXFuALx9geFcXzYMsSoJmHQ=; b=cU9DOCoAHpclFvXNkT6RlkDDu0yRGdJDOXgGrSZC3SFXs834P3f+ufl5rDZQ5YCuExZ3chm8n 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U42mmrJ7uCp6eptUuuX1IBvkNqyWIvRcJV3EaZI3KZeAXKWbh1KOuLp/Qx+LFXa8My2MVuKni0gpq/t4TYnem8+ROYKAwpxB4VpgkT8ZjSahIRbukPH8TbyaKcWFC1nT X-MS-Exchange-Transport-CrossTenantHeadersStamped: GV2PR04MB12086 From: Pankaj Gupta Documents i.MX SoC's Service layer and C_DEV driver for selected SoC(s) that contains the NXP hardware IP(s) for Secure Enclaves(se) like: - NXP EdgeLock Enclave on i.MX93 & i.MX8ULP Signed-off-by: Pankaj Gupta Signed-off-by: Frank Li --- .../driver-api/firmware/other_interfaces.rst | 133 +++++++++++++++++++++ 1 file changed, 133 insertions(+) diff --git a/Documentation/driver-api/firmware/other_interfaces.rst b/Documentation/driver-api/firmware/other_interfaces.rst index 06ac89adaafb..6c6fa9a0ba1d 100644 --- a/Documentation/driver-api/firmware/other_interfaces.rst +++ b/Documentation/driver-api/firmware/other_interfaces.rst @@ -49,3 +49,136 @@ of the requests on to a secure monitor (EL3). .. kernel-doc:: drivers/firmware/stratix10-svc.c :export: + +NXP Secure Enclave Firmware Interface +===================================== + +Introduction +------------ +The NXP's i.MX HW IP like EdgeLock Enclave, V2X etc., creates an embedded secure +enclave within the SoC boundary to enable features like: + +- Hardware Security Module (HSM) +- Security Hardware Extension (SHE) +- Vehicular to Anything (V2X) + +Each of the above features is enabled through dedicated NXP H/W IP on the SoC. +On a single SoC, multiple hardware IP (or can say more than one secure enclave) +can exist. + +NXP SoCs enabled with the such secure enclaves(SEs) IPs are: +i.MX93, i.MX8ULP + +To communicate with one or more co-existing SE(s) on SoC, there is/are dedicated +messaging units(MU) per SE. Each co-existing SE can have one or multiple exclusive +MUs, dedicated to itself. None of the MU is shared between two SEs. Communication +of the MU is realized using the mailbox driver. Each secure enclave can cater to +multiple clients by virtue of these exclusive MUs. Also, they can distinguish +transactions originating from these clients based on the MU used and core security +state. The communication between the clients and secure enclaves is in the form of +a command/response mechanism. Each client could expose a specific set of secure enclave +features to the higher layers, based on the commands supported by that client. For +example, the secure enclave could simultaneously support an OPTEE TA and Linux +middleware as clients. Each of these clients can expose a specific set of secure +enclave features based on the command set supported by them. + +NXP Secure Enclave(SE) Interface +-------------------------------- +MU(s) is/are not shared between SE(s). But for an SoC like i.MX95 which has +multiple SE(s) like HSM, V2X-HSM, V2X-SHE, all the SE(s) and their interfaces 'se-if' +that is/are dedicated to a particular SE will be enumerated and provisioned using the +single compatible node("fsl,imx95-se"). + +Each 'se-if' comprises two layers: + +- (C_DEV Layer) User-Space software-access interface. +- (Service Layer) OS-level software-access interface. + +:: + + +--------------------------------------------+ + | Character Device(C_DEV) | + | | + | +---------+ +---------+ +---------+ | + | | misc #1 | | misc #2 | ... | misc #n | | + | | dev | | dev | | dev | | + | +---------+ +---------+ +---------+ | + | +-------------------------+ | + | | Misc. Dev Synchr. Logic | | + | +-------------------------+ | + | | + +--------------------------------------------+ + + +--------------------------------------------+ + | Service Layer | + | | + | +-----------------------------+ | + | | Message Serialization Logic | | + | +-----------------------------+ | + | +---------------+ | + | | imx-mailbox | | + | | mailbox.c | | + | +---------------+ | + | | + +--------------------------------------------+ + +- service layer: + This layer is responsible for ensuring the communication protocol that is defined + for communication with firmware. + + FW Communication protocol ensures two things: + + - Serializing the messages to be sent over an MU. + - FW can handle one command message at a time. + +- c_dev: + This layer offers character device contexts, created as '/dev/_mux_chx'. + Using these multiple device contexts that are multiplexed over a single MU, + userspace application(s) can call fops like write/read to send the command message, + and read back the command response message to/from Firmware. + fops like read & write use the above defined service layer API(s) to communicate with + Firmware. + + Misc-device(/dev/_mux_chn) synchronization protocol:: + + Non-Secure + Secure + | + | + +-----------+ +-------------+ | + | se_ctrl.c +<---->+imx-mailbox.c| | + | | | mailbox.c +<-->+------+ +------+ + +-----+-----+ +-------------+ | MU X +<-->+ ELE | + | +------+ +------+ + +----------------+ | + | | | + v v | + logical logical | + receiver waiter | + + + | + | | | + | | | + | +----+------+ | + | | | | + | | | | + device_ctx device_ctx device_ctx | + | + User 0 User 1 User Y | + +------+ +------+ +------+ | + |misc.c| |misc.c| |misc.c| | + kernel space +------+ +------+ +------+ | + | + +---------------------------------------------------- | + | | | | + userspace /dev/ele_muXch0 | | | + /dev/ele_muXch1 | | + /dev/ele_muXchY | + | + +When a user sends a command to the firmware, it registers its device_ctx +as waiter of a response from firmware. + +Enclave's Firmware owns the storage management over a Linux filesystem. +For this c_dev provisions a dedicated slave device called "receiver". + +.. kernel-doc:: drivers/firmware/imx/se_ctrl.c + :export: -- 2.43.0