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Message-ID:
 <AM9PR04MB8604B837A1EED8EAE3B29B8895A12@AM9PR04MB8604.eurprd04.prod.outlook.com>
Date: Mon, 15 Jul 2024 09:02:52 +0000
From: Pankaj Gupta <pankaj.gupta@....com>
To: Amit Singh Tomar <amitsinght@...vell.com>, Jonathan Corbet
	<corbet@....net>, Rob Herring <robh@...nel.org>, Krzysztof Kozlowski
	<krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, Shawn Guo
	<shawnguo@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>, Pengutronix
 Kernel Team <kernel@...gutronix.de>, Fabio Estevam <festevam@...il.com>, Rob
 Herring <robh+dt@...nel.org>
CC: "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"imx@...ts.linux.dev" <imx@...ts.linux.dev>,
	"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>
Subject: RE: [EXT] [PATCH v5 4/5] firmware: imx: add driver for NXP EdgeLock
 Enclave



> -----Original Message-----
> From: Amit Singh Tomar <amitsinght@...vell.com>
> Sent: Saturday, July 13, 2024 11:26 PM
> To: Pankaj Gupta <pankaj.gupta@....com>; Jonathan Corbet
> <corbet@....net>; Rob Herring <robh@...nel.org>; Krzysztof Kozlowski
> <krzk+dt@...nel.org>; Conor Dooley <conor+dt@...nel.org>; Shawn Guo
> <shawnguo@...nel.org>; Sascha Hauer <s.hauer@...gutronix.de>;
> Pengutronix Kernel Team <kernel@...gutronix.de>; Fabio Estevam
> <festevam@...il.com>; Rob Herring <robh+dt@...nel.org>
> Cc: linux-doc@...r.kernel.org; linux-kernel@...r.kernel.org;
> devicetree@...r.kernel.org; imx@...ts.linux.dev; linux-arm-
> kernel@...ts.infradead.org
> Subject: [EXT] [PATCH v5 4/5] firmware: imx: add driver for NXP EdgeLock
> Enclave
> 
> Caution: This is an external email. Please take care when clicking links or
> opening attachments. When in doubt, report the message using the 'Report
> this email' button
> 
> 
> On 7/12/2024 11:49 AM, Pankaj Gupta wrote:
> > NXP hardware IP(s) for secure-enclaves like Edgelock Enclave(ELE), are
> > embedded in the SoC to support the features like HSM, SHE & V2X, using
> > message based communication interface.
> >
> > The secure enclave FW communicates on a dedicated messaging unit(MU)
> > based interface(s) with application core, where kernel is running.
> > It exists on specific i.MX processors. e.g. i.MX8ULP, i.MX93.
> >
> > This patch adds the driver for communication interface to
> > secure-enclave, for exchanging messages with NXP secure enclave HW
> > IP(s) like EdgeLock Enclave (ELE) from Kernel-space, used by kernel
> > management layers like
> > - DM-Crypt.
> >
> > Signed-off-by: Pankaj Gupta <pankaj.gupta@....com>
> > ---
> >    drivers/firmware/imx/Kconfig        |  12 +
> >    drivers/firmware/imx/Makefile       |   2 +
> >    drivers/firmware/imx/ele_base_msg.c | 251 ++++++++++++++++++
> >    drivers/firmware/imx/ele_base_msg.h |  93 +++++++
> >    drivers/firmware/imx/ele_common.c   | 264 +++++++++++++++++++
> >    drivers/firmware/imx/ele_common.h   |  44 ++++
> >    drivers/firmware/imx/se_ctrl.c      | 496
> ++++++++++++++++++++++++++++++++++++
> >    drivers/firmware/imx/se_ctrl.h      |  83 ++++++
> >    include/linux/firmware/imx/se_api.h |  14 +
> >    9 files changed, 1259 insertions(+)
> >
> > diff --git a/drivers/firmware/imx/Kconfig
> > b/drivers/firmware/imx/Kconfig index 183613f82a11..0f6877a24f0b
> 100644
> > --- a/drivers/firmware/imx/Kconfig
> > +++ b/drivers/firmware/imx/Kconfig
> > @@ -22,3 +22,15 @@ config IMX_SCU
> >
> >         This driver manages the IPC interface between host CPU and the
> >         SCU firmware running on M4.
> > +
> > +config IMX_SEC_ENCLAVE
> > +     tristate "i.MX Embedded Secure Enclave - EdgeLock Enclave Firmware
> driver."
> > +     depends on IMX_MBOX && ARCH_MXC && ARM64
> > +     default m if ARCH_MXC
> > +
> > +     help
> > +       It is possible to use APIs exposed by the iMX Secure Enclave HW IP
> called:
> > +       - EdgeLock Enclave Firmware (for i.MX8ULP, i.MX93),
> > +         like base, HSM, V2X & SHE using the SAB protocol via the shared
> Messaging
> > +         Unit. This driver exposes these interfaces via a set of file descriptors
> > +         allowing to configure shared memory, send and receive messages.
> > diff --git a/drivers/firmware/imx/Makefile
> > b/drivers/firmware/imx/Makefile index 8f9f04a513a8..aa9033e0e9e3
> > 100644
> > --- a/drivers/firmware/imx/Makefile
> > +++ b/drivers/firmware/imx/Makefile
> > @@ -1,3 +1,5 @@
> >    # SPDX-License-Identifier: GPL-2.0
> >    obj-$(CONFIG_IMX_DSP)              += imx-dsp.o
> >    obj-$(CONFIG_IMX_SCU)              += imx-scu.o misc.o imx-scu-irq.o rm.o
> imx-scu-soc.o
> > +sec_enclave-objs             = se_ctrl.o ele_common.o ele_base_msg.o
> > +obj-${CONFIG_IMX_SEC_ENCLAVE}        += sec_enclave.o
> > diff --git a/drivers/firmware/imx/ele_base_msg.c
> > b/drivers/firmware/imx/ele_base_msg.c
> > new file mode 100644
> > index 000000000000..3b6ddc2c60c2
> > --- /dev/null
> > +++ b/drivers/firmware/imx/ele_base_msg.c
> > @@ -0,0 +1,251 @@
> > +// SPDX-License-Identifier: GPL-2.0+
> > +/*
> > + * Copyright 2024 NXP
> > + */
> > +
> > +#include <linux/types.h>
> > +
> nit: Do we need a newline here? If not, please arrange it alphabetically.
> > +#include <linux/completion.h>
> > +#include <linux/dma-mapping.h>
> > +#include <linux/genalloc.h>
> > +
> > +#include "ele_base_msg.h"
> > +#include "ele_common.h"
> > +
> > +int ele_get_info(struct device *dev, struct ele_dev_info *s_info) {
> > +     struct se_if_priv *priv = dev_get_drvdata(dev);
> > +     struct se_api_msg *tx_msg __free(kfree) = NULL;
> > +     struct se_api_msg *rx_msg __free(kfree) = NULL;
> > +     dma_addr_t get_info_addr = 0;
> > +     u32 *get_info_data = NULL;
> > +     int ret = 0;
> > +
> > +     memset(s_info, 0x0, sizeof(*s_info));
> > +
> > +     if (priv->mem_pool)
> > +             get_info_data = gen_pool_dma_alloc(priv->mem_pool,
> > +                                                ELE_GET_INFO_BUFF_SZ,
> > +                                                &get_info_addr);
> > +     else
> > +             get_info_data = dma_alloc_coherent(dev,
> > +                                                ELE_GET_INFO_BUFF_SZ,
> > +                                                &get_info_addr,
> > +                                                GFP_KERNEL);
> > +     if (!get_info_data) {
> > +             ret = -ENOMEM;
> This isn't really needed, and would've made sense with goto.
> Just use return -ENOMEM after dev_dbg.

It was the older review comment to change this way.

> > +             dev_dbg(dev,
> > +                     "%s: Failed to allocate get_info_addr.\n",
> > +                     __func__);
> > +             return ret;
> > +     }
> > +
> > +     tx_msg = kzalloc(ELE_GET_INFO_REQ_MSG_SZ, GFP_KERNEL);
> > +     if (!tx_msg) {
> > +             ret = -ENOMEM;
> > +             goto exit;
> > +     }
> > +
> > +     rx_msg = kzalloc(ELE_GET_INFO_RSP_MSG_SZ, GFP_KERNEL);
> > +     if (!rx_msg) {
> > +             ret = -ENOMEM;
> > +             goto exit;
> > +     }
> > +     priv->rx_msg_sz = ELE_GET_INFO_RSP_MSG_SZ;
> > +
> > +     ret = se_fill_cmd_msg_hdr(priv,
> > +                                   (struct se_msg_hdr *)&tx_msg->header,
> > +                                   ELE_GET_INFO_REQ,
> > +                                   ELE_GET_INFO_REQ_MSG_SZ,
> > +                                   true);
> > +     if (ret)
> > +             goto exit;
> > +
> > +     tx_msg->data[0] = upper_32_bits(get_info_addr);
> > +     tx_msg->data[1] = lower_32_bits(get_info_addr);
> > +     tx_msg->data[2] = sizeof(*s_info);
> > +     ret = ele_msg_send_rcv(priv, tx_msg, rx_msg);
> > +     if (ret < 0)
> > +             goto exit;
> > +
> > +     ret = se_val_rsp_hdr_n_status(priv,
> > +                                   &rx_msg->header,
> > +                                   ELE_GET_INFO_REQ,
> > +                                   ELE_GET_INFO_RSP_MSG_SZ,
> > +                                   true);
> > +
> > +     memcpy(s_info, get_info_data, sizeof(*s_info));
> > +
> > +exit:
> > +     if (priv->mem_pool)
> > +             gen_pool_free(priv->mem_pool,
> > +                           (u64) get_info_data,
> > +                           ELE_GET_INFO_BUFF_SZ);
> > +     else
> > +             dma_free_coherent(dev,
> > +                               ELE_GET_INFO_BUFF_SZ,
> > +                               get_info_data,
> > +                               get_info_addr);
> > +
> > +     return ret;
> > +}
> > +
> > +int ele_fetch_soc_info(struct device *dev, u16 *soc_rev, u64
> > +*serial_num) {
> > +     struct ele_dev_info s_info = {0};
> > +     int err = 0;
> > +
> > +     err = ele_get_info(dev, &s_info);
> > +     if (err < 0) {
> > +             dev_err(dev, "Error");
> > +             return err;
> > +     }
> > +
> > +     *soc_rev = s_info.d_info.soc_rev;
> > +     *serial_num = GET_SERIAL_NUM_FROM_UID(s_info.d_info.uid,
> > + MAX_UID_SIZE >> 2);
> > +
> > +     return err;
> > +}
> > +
> > +int ele_ping(struct device *dev)
> > +{
> > +     struct se_if_priv *priv = dev_get_drvdata(dev);
> > +     struct se_api_msg *tx_msg __free(kfree) = NULL;
> > +     struct se_api_msg *rx_msg __free(kfree) = NULL;
> > +     int ret = 0;
> > +
> > +     tx_msg = kzalloc(ELE_PING_REQ_SZ, GFP_KERNEL);
> > +     if (!tx_msg) {
> > +             ret = -ENOMEM;
> > +             goto exit;
> > +     }
> > +
> > +     rx_msg = kzalloc(ELE_PING_RSP_SZ, GFP_KERNEL);
> > +     if (!rx_msg) {
> > +             ret = -ENOMEM;
> > +             goto exit;
> > +     }
> > +     priv->rx_msg_sz = ELE_PING_RSP_SZ;
> > +
> > +     ret = se_fill_cmd_msg_hdr(priv,
> > +                                   (struct se_msg_hdr *)&tx_msg->header,
> > +                                   ELE_PING_REQ, ELE_PING_REQ_SZ, true);
> > +     if (ret) {
> > +             dev_err(dev, "Error: se_fill_cmd_msg_hdr failed.\n");
> > +             goto exit;
> > +     }
> > +
> > +     ret = ele_msg_send_rcv(priv, tx_msg, rx_msg);
> > +     if (ret)
> > +             goto exit;
> > +
> > +     ret = se_val_rsp_hdr_n_status(priv,
> > +                                   &rx_msg->header,
> > +                                   ELE_PING_REQ,
> > +                                   ELE_PING_RSP_SZ,
> > +                                   true);
> > +exit:
> > +     return ret;
> > +}
> > +
> > +int ele_service_swap(struct device *dev,
> > +                  phys_addr_t addr,
> > +                  u32 addr_size, u16 flag) {
> > +     struct se_if_priv *priv = dev_get_drvdata(dev);
> > +     struct se_api_msg *tx_msg __free(kfree) = NULL;
> > +     struct se_api_msg *rx_msg __free(kfree) = NULL;
> > +     int ret = 0;
> > +
> > +     tx_msg = kzalloc(ELE_SERVICE_SWAP_REQ_MSG_SZ, GFP_KERNEL);
> > +     if (!tx_msg) {
> > +             ret = -ENOMEM;
> > +             goto exit;
> > +     }
> > +
> > +     rx_msg = kzalloc(ELE_SERVICE_SWAP_RSP_MSG_SZ, GFP_KERNEL);
> > +     if (!rx_msg) {
> > +             ret = -ENOMEM;
> > +             goto exit;
> > +     }
> > +     priv->rx_msg_sz = ELE_SERVICE_SWAP_RSP_MSG_SZ;
> > +
> > +     ret = se_fill_cmd_msg_hdr(priv,
> > +                                   (struct se_msg_hdr *)&tx_msg->header,
> > +                                   ELE_SERVICE_SWAP_REQ,
> > +                                   ELE_SERVICE_SWAP_REQ_MSG_SZ, true);
> > +     if (ret)
> > +             goto exit;
> > +
> > +     tx_msg->data[0] = flag;
> > +     tx_msg->data[1] = addr_size;
> > +     tx_msg->data[2] = ELE_NONE_VAL;
> > +     tx_msg->data[3] = lower_32_bits(addr);
> > +     tx_msg->data[4] = se_add_msg_crc((uint32_t *)&tx_msg[0],
> > +                                              ELE_SERVICE_SWAP_REQ_MSG_SZ);
> > +     ret = ele_msg_send_rcv(priv, tx_msg, rx_msg);
> > +     if (ret < 0)
> > +             goto exit;
> > +
> > +     ret = se_val_rsp_hdr_n_status(priv,
> > +                                   &rx_msg->header,
> > +                                   ELE_SERVICE_SWAP_REQ,
> > +                                   ELE_SERVICE_SWAP_RSP_MSG_SZ,
> > +                                   true);
> > +     if (ret)
> > +             goto exit;
> > +
> > +     if (flag == ELE_IMEM_EXPORT)
> > +             ret = rx_msg->data[1];
> > +     else
> > +             ret = 0;
> > +
> > +exit:
> > +
> > +     return ret;
> > +}
> > +
> > +int ele_fw_authenticate(struct device *dev, phys_addr_t addr) {
> > +     struct se_if_priv *priv = dev_get_drvdata(dev);
> > +     struct se_api_msg *tx_msg __free(kfree) = NULL;
> > +     struct se_api_msg *rx_msg __free(kfree) = NULL;
> > +     int ret = 0;
> > +
> > +     tx_msg = kzalloc(ELE_FW_AUTH_REQ_SZ, GFP_KERNEL);
> > +     if (!tx_msg) {
> > +             ret = -ENOMEM;
> > +             goto exit;
> > +     }
> > +
> > +     rx_msg = kzalloc(ELE_FW_AUTH_RSP_MSG_SZ, GFP_KERNEL);
> > +     if (!rx_msg) {
> > +             ret = -ENOMEM;
> > +             goto exit;
> > +     }
> > +     priv->rx_msg_sz = ELE_FW_AUTH_RSP_MSG_SZ;
> > +
> > +     ret = se_fill_cmd_msg_hdr(priv,
> > +                               (struct se_msg_hdr *)&tx_msg->header,
> > +                               ELE_FW_AUTH_REQ,
> > +                               ELE_FW_AUTH_REQ_SZ,
> > +                               true);
> > +     if (ret)
> > +             goto exit;
> > +
> > +     tx_msg->data[1] = upper_32_bits(addr);
> > +     tx_msg->data[0] = lower_32_bits(addr);
> > +     tx_msg->data[2] = addr;
> > +
> > +     ret = ele_msg_send_rcv(priv, tx_msg, rx_msg);
> > +     if (ret < 0)
> > +             goto exit;
> > +
> > +     ret = se_val_rsp_hdr_n_status(priv,
> > +                                   &rx_msg->header,
> > +                                   ELE_FW_AUTH_REQ,
> > +                                   ELE_FW_AUTH_RSP_MSG_SZ,
> > +                                   true);
> > +exit:
> > +     return ret;
> > +}
> > diff --git a/drivers/firmware/imx/ele_base_msg.h
> > b/drivers/firmware/imx/ele_base_msg.h
> > new file mode 100644
> > index 000000000000..a037205dc03d
> > --- /dev/null
> > +++ b/drivers/firmware/imx/ele_base_msg.h
> > @@ -0,0 +1,93 @@
> > +/* SPDX-License-Identifier: GPL-2.0+ */
> > +/*
> > + * Copyright 2024 NXP
> > + *
> > + * Header file for the EdgeLock Enclave Base API(s).
> > + */
> > +
> > +#ifndef ELE_BASE_MSG_H
> > +#define ELE_BASE_MSG_H
> > +
> > +#include <linux/device.h>
> > +#include <linux/types.h>
> > +
> > +#define WORD_SZ                              4
> > +#define ELE_NONE_VAL                 0x0
> > +
> > +#define ELE_GET_INFO_REQ             0xDA
> > +#define ELE_GET_INFO_REQ_MSG_SZ              0x10
> > +#define ELE_GET_INFO_RSP_MSG_SZ              0x08
> > +
> > +#define ELE_GET_INFO_BUFF_SZ         0x100
> > +
> > +#define DEFAULT_IMX_SOC_VER          0xA000
> > +#define SOC_VER_MASK                 0xFFFF0000
> > +#define SOC_ID_MASK                  0x0000FFFF
> > +
> > +#define MAX_UID_SIZE                     (16)
> > +#define DEV_GETINFO_ROM_PATCH_SHA_SZ     (32)
> > +#define DEV_GETINFO_FW_SHA_SZ            (32)
> > +#define DEV_GETINFO_OEM_SRKH_SZ          (64)
> > +#define DEV_GETINFO_MIN_VER_MASK     0xFF
> > +#define DEV_GETINFO_MAJ_VER_MASK     0xFF00
> > +
> > +struct dev_info {
> > +     uint8_t  cmd;
> > +     uint8_t  ver;
> > +     uint16_t length;
> > +     uint16_t soc_id;
> > +     uint16_t soc_rev;
> > +     uint16_t lmda_val;
> > +     uint8_t  ssm_state;
> > +     uint8_t  dev_atts_api_ver;
> > +     uint8_t  uid[MAX_UID_SIZE];
> > +     uint8_t  sha_rom_patch[DEV_GETINFO_ROM_PATCH_SHA_SZ];
> > +     uint8_t  sha_fw[DEV_GETINFO_FW_SHA_SZ]; };
> > +
> > +struct dev_addn_info {
> > +     uint8_t  oem_srkh[DEV_GETINFO_OEM_SRKH_SZ];
> > +     uint8_t  trng_state;
> > +     uint8_t  csal_state;
> > +     uint8_t  imem_state;
> > +     uint8_t  reserved2;
> > +};
> > +
> > +struct ele_dev_info {
> > +     struct dev_info d_info;
> > +     struct dev_addn_info d_addn_info; };
> > +
> > +#define GET_SERIAL_NUM_FROM_UID(x, uid_word_sz) \
> > +     (((u64)(((u32 *)(x))[(uid_word_sz) - 1]) << 32) | ((u32
> > +*)(x))[0])
> > +
> > +#define ELE_DEBUG_DUMP_REQ           0x21
> > +#define ELE_DEBUG_DUMP_RSP_SZ                0x14
> > +
> > +#define ELE_PING_REQ                 0x01
> > +#define ELE_PING_REQ_SZ                      0x04
> > +#define ELE_PING_RSP_SZ                      0x08
> > +
> > +#define ELE_SERVICE_SWAP_REQ         0xDF
> > +#define ELE_SERVICE_SWAP_REQ_MSG_SZ  0x18 #define
> > +ELE_SERVICE_SWAP_RSP_MSG_SZ  0x0C
> > +#define ELE_IMEM_SIZE                        0x10000
> > +#define ELE_IMEM_STATE_OK            0xCA
> > +#define ELE_IMEM_STATE_BAD           0xFE
> > +#define ELE_IMEM_STATE_WORD          0x27
> > +#define ELE_IMEM_STATE_MASK          0x00ff0000
> > +#define ELE_IMEM_EXPORT                      0x1
> > +#define ELE_IMEM_IMPORT                      0x2
> > +
> > +#define ELE_FW_AUTH_REQ                      0x02
> > +#define ELE_FW_AUTH_REQ_SZ           0x10
> > +#define ELE_FW_AUTH_RSP_MSG_SZ               0x08
> > +
> > +int ele_get_info(struct device *dev, struct ele_dev_info *s_info);
> > +int ele_fetch_soc_info(struct device *dev, u16 *soc_rev, u64
> > +*serial_num); int ele_ping(struct device *dev); int
> > +ele_service_swap(struct device *dev,
> > +                  phys_addr_t addr,
> > +                  u32 addr_size, u16 flag); int
> > +ele_fw_authenticate(struct device *dev, phys_addr_t addr); #endif
> > diff --git a/drivers/firmware/imx/ele_common.c
> > b/drivers/firmware/imx/ele_common.c
> > new file mode 100644
> > index 000000000000..b2be32550e9b
> > --- /dev/null
> > +++ b/drivers/firmware/imx/ele_common.c
> > @@ -0,0 +1,264 @@
> > +// SPDX-License-Identifier: GPL-2.0+
> > +/*
> > + * Copyright 2024 NXP
> > + */
> > +
> > +#include "ele_base_msg.h"
> > +#include "ele_common.h"
> > +
> > +u32 se_add_msg_crc(u32 *msg, u32 msg_len) {
> > +     u32 nb_words = msg_len / (u32)sizeof(u32);
> > +     u32 crc = 0;
> > +     u32 i;
> > +
> > +     for (i = 0; i < nb_words - 1; i++)
> > +             crc ^= *(msg + i);
> > +
> > +     return crc;
> > +}
> > +
> > +int ele_msg_rcv(struct se_if_priv *priv) {
> > +     u32 wait;
> > +     int err = 0;
> > +
> > +     lockdep_assert_held(&priv->se_if_cmd_lock);
> > +
> > +     wait = msecs_to_jiffies(1000);
> > +     if (!wait_for_completion_timeout(&priv->done, wait)) {
> > +             dev_err(priv->dev,
> > +                             "Error: wait_for_completion timed out.\n");
> > +             err = -ETIMEDOUT;
> > +     }
> > +
> > +     return err;
> > +}
> > +
> > +int ele_msg_send(struct se_if_priv *priv, void *tx_msg) {
> > +     struct se_msg_hdr *header;
> > +     int err;
> > +
> > +     header = tx_msg;
> > +
> > +     if (header->tag == priv->cmd_tag)
> > +             lockdep_assert_held(&priv->se_if_cmd_lock);
> > +
> > +     scoped_guard(mutex, &priv->se_if_lock);
> > +
> > +     err = mbox_send_message(priv->tx_chan, tx_msg);
> > +     if (err < 0) {
> > +             dev_err(priv->dev, "Error: mbox_send_message failure.\n");
> > +             return err;
> > +     }
> > +
> > +     return err;
> > +}
> > +
> > +/* API used for send/receive blocking call. */ int
> > +ele_msg_send_rcv(struct se_if_priv *priv, void *tx_msg, void *rx_msg)
> > +{
> > +     int err;
> > +
> > +     scoped_guard(mutex, &priv->se_if_cmd_lock);
> > +     if (priv->waiting_rsp_dev) {
> > +             dev_warn(priv->dev,
> > +                     "There should be no misc dev-ctx, waiting for resp.\n");
> > +             priv->waiting_rsp_dev = NULL;
> > +     }
> > +     priv->rx_msg = rx_msg;
> > +     err = ele_msg_send(priv, tx_msg);
> > +     if (err < 0)
> > +             goto exit;
> > +
> > +     err = ele_msg_rcv(priv);
> > +
> > +exit:
> > +     return err;
> > +}
> > +
> > +static bool exception_for_size(struct se_if_priv *priv,
> > +                             struct se_msg_hdr *header) {
> > +     /* List of API(s) that can be accepte variable length
> > +      * response buffer.
> > +      */
> > +     if (header->command == ELE_DEBUG_DUMP_REQ &&
> > +             header->ver == priv->base_api_ver &&
> > +             header->size >= 0 &&
> > +             header->size <= ELE_DEBUG_DUMP_RSP_SZ)
> > +             return true;
> > +
> > +     return false;
> > +}
> > +
> > +/*
> > + * Callback called by mailbox FW, when data is received.
> > + */
> > +void se_if_rx_callback(struct mbox_client *mbox_cl, void *msg) {
> > +     struct device *dev = mbox_cl->dev;
> > +     struct se_if_priv *priv;
> > +     struct se_msg_hdr *header;
> > +     u32 rx_msg_sz;
> > +
> > +     priv = dev_get_drvdata(dev);
> > +
> > +     /* The function can be called with NULL msg */
> > +     if (!msg) {
> > +             dev_err(dev, "Message is invalid\n");
> > +             return;
> > +     }
> > +
> > +     header = msg;
> > +     rx_msg_sz = header->size << 2;
> > +
> > +     if (header->tag == priv->rsp_tag) {
> > +             if (!priv->waiting_rsp_dev) {
> > +                     /*
> > +                      * Reading the EdgeLock Enclave response
> > +                      * to the command, sent by other
> > +                      * linux kernel services.
> > +                      */
> > +                     spin_lock(&priv->lock);
> > +                     if (priv->rx_msg_sz != rx_msg_sz &&
> > +                                     !exception_for_size(priv, header))
> > +                             dev_err(dev,
> > +                                     "Msg(priv) recvd with different sz(%d != %d).\n",
> > +                                     rx_msg_sz, priv->rx_msg_sz);
> > +                     else
> > +                             memcpy(priv->rx_msg, msg, rx_msg_sz);
> > +
> > +                     complete(&priv->done);
> > +                     spin_unlock(&priv->lock);
> > +                     return;
> > +             }
> > +     }
> > +
> > +     dev_err(dev, "Failed to select a device for message: %.8x\n",
> > +             *((u32 *) header));
> > +}
> > +
> > +int se_val_rsp_hdr_n_status(struct se_if_priv *priv,
> > +                         struct se_msg_hdr *header,
> > +                         uint8_t msg_id,
> > +                         uint8_t sz,
> > +                         bool is_base_api) {
> > +     u32 status;
> > +
> > +     if (header->tag != priv->rsp_tag) {
> > +             dev_err(priv->dev,
> > +                     "MSG[0x%x] Hdr: Resp tag mismatch. (0x%x != 0x%x)",
> > +                     msg_id, header->tag, priv->rsp_tag);
> > +             return -EINVAL;
> > +     }
> > +
> > +     if (header->command != msg_id) {
> > +             dev_err(priv->dev,
> > +                     "MSG Header: Cmd id mismatch. (0x%x != 0x%x)",
> > +                     header->command, msg_id);
> > +             return -EINVAL;
> > +     }
> > +
> > +     if (header->size != (sz >> 2)) {
> > +             dev_err(priv->dev,
> > +                     "MSG[0x%x] Hdr: Cmd size mismatch. (0x%x != 0x%x)",
> > +                     msg_id, header->size, (sz >> 2));
> > +             return -EINVAL;
> > +     }
> > +
> > +     if (is_base_api && (header->ver != priv->base_api_ver)) {
> > +             dev_err(priv->dev,
> > +                     "MSG[0x%x] Hdr: Base API Vers mismatch. (0x%x != 0x%x)",
> > +                     msg_id, header->ver, priv->base_api_ver);
> > +             return -EINVAL;
> > +     } else if (!is_base_api && header->ver != priv->fw_api_ver) {
> > +             dev_err(priv->dev,
> > +                     "MSG[0x%x] Hdr: FW API Vers mismatch. (0x%x != 0x%x)",
> > +                     msg_id, header->ver, priv->fw_api_ver);
> > +             return -EINVAL;
> > +     }
> > +
> > +     status = RES_STATUS(priv->rx_msg->data[0]);
> > +     if (status != priv->success_tag) {
> > +             dev_err(priv->dev, "Command Id[%d], Response Failure = 0x%x",
> > +                     header->command, status);
> > +             return -EPERM;
> > +     }
> > +
> > +     return 0;
> > +}
> > +
> > +int se_save_imem_state(struct se_if_priv *priv) {
> > +     int ret;
> > +
> > +     /* EXPORT command will save encrypted IMEM to given address,
> > +      * so later in resume, IMEM can be restored from the given
> > +      * address.
> > +      *
> > +      * Size must be at least 64 kB.
> > +      */
> > +     ret = ele_service_swap(priv->dev,
> > +                            priv->imem.phyaddr,
> > +                            ELE_IMEM_SIZE,
> > +                            ELE_IMEM_EXPORT);
> > +     if (ret < 0)
> > +             dev_err(priv->dev, "Failed to export IMEM\n");
> > +     else
> > +             dev_info(priv->dev,
> > +                     "Exported %d bytes of encrypted IMEM\n",
> > +                     ret);
> > +
> > +     return ret;
> > +}
> > +
> > +int se_restore_imem_state(struct se_if_priv *priv) {
> > +     struct ele_dev_info s_info;
> > +     int ret;
> > +
> > +     /* get info from ELE */
> > +     ret = ele_get_info(priv->dev, &s_info);
> > +     if (ret) {
> > +             dev_err(priv->dev, "Failed to get info from ELE.\n");
> > +             return ret;
> > +     }
> > +
> > +     /* Get IMEM state, if 0xFE then import IMEM */
> > +     if (s_info.d_addn_info.imem_state == ELE_IMEM_STATE_BAD) {
> > +             /* IMPORT command will restore IMEM from the given
> > +              * address, here size is the actual size returned by ELE
> > +              * during the export operation
> > +              */
> > +             ret = ele_service_swap(priv->dev,
> > +                                    priv->imem.phyaddr,
> > +                                    priv->imem.size,
> > +                                    ELE_IMEM_IMPORT);
> > +             if (ret) {
> > +                     dev_err(priv->dev, "Failed to import IMEM\n");
> > +                     goto exit;
> > +             }
> > +     } else
> > +             goto exit;
> > +
> > +     /* After importing IMEM, check if IMEM state is equal to 0xCA
> > +      * to ensure IMEM is fully loaded and
> > +      * ELE functionality can be used.
> > +      */
> > +     ret = ele_get_info(priv->dev, &s_info);
> > +     if (ret) {
> > +             dev_err(priv->dev, "Failed to get info from ELE.\n");
> > +             goto exit;
> > +     }
> > +
> > +     if (s_info.d_addn_info.imem_state == ELE_IMEM_STATE_OK)
> > +             dev_info(priv->dev, "Successfully restored IMEM\n");
> > +     else
> > +             dev_err(priv->dev, "Failed to restore IMEM\n");
> > +
> > +exit:
> > +     return ret;
> > +}
> > diff --git a/drivers/firmware/imx/ele_common.h
> > b/drivers/firmware/imx/ele_common.h
> > new file mode 100644
> > index 000000000000..5ef775a42ab3
> > --- /dev/null
> > +++ b/drivers/firmware/imx/ele_common.h
> > @@ -0,0 +1,44 @@
> > +/* SPDX-License-Identifier: GPL-2.0+ */
> > +/*
> > + * Copyright 2024 NXP
> > + */
> > +
> > +
> > +#ifndef __ELE_COMMON_H__
> > +#define __ELE_COMMON_H__
> > +
> > +#include "se_ctrl.h"
> > +
> > +#define ELE_SUCCESS_IND                      0xD6
> > +
> > +#define IMX_ELE_FW_DIR                 "imx/ele/"
> > +
> > +uint32_t se_add_msg_crc(uint32_t *msg, uint32_t msg_len); int
> > +ele_msg_rcv(struct se_if_priv *priv); int ele_msg_send(struct
> > +se_if_priv *priv, void *tx_msg); int ele_msg_send_rcv(struct
> > +se_if_priv *priv, void *tx_msg, void *rx_msg); void
> > +se_if_rx_callback(struct mbox_client *mbox_cl, void *msg); int
> > +se_val_rsp_hdr_n_status(struct se_if_priv *priv,
> > +                         struct se_msg_hdr *header,
> > +                         uint8_t msg_id,
> > +                         uint8_t sz,
> > +                         bool is_base_api);
> > +
> > +/* Fill a command message header with a given command ID and length
> > +in bytes. */ static inline int se_fill_cmd_msg_hdr(struct se_if_priv *priv,
> > +                                   struct se_msg_hdr *hdr,
> > +                                   u8 cmd, u32 len,
> > +                                   bool is_base_api) {
> > +     hdr->tag = priv->cmd_tag;
> > +     hdr->ver = (is_base_api) ? priv->base_api_ver : priv->fw_api_ver;
> > +     hdr->command = cmd;
> > +     hdr->size = len >> 2;
> > +
> > +     return 0;
> > +}
> > +
> > +int se_save_imem_state(struct se_if_priv *priv); int
> > +se_restore_imem_state(struct se_if_priv *priv);
> > +
> > +#endif /*__ELE_COMMON_H__ */
> > diff --git a/drivers/firmware/imx/se_ctrl.c
> > b/drivers/firmware/imx/se_ctrl.c new file mode 100644 index
> > 000000000000..a844794d2b39
> > --- /dev/null
> > +++ b/drivers/firmware/imx/se_ctrl.c
> > @@ -0,0 +1,496 @@
> > +// SPDX-License-Identifier: GPL-2.0+
> > +/*
> > + * Copyright 2024 NXP
> > + */
> > +
> > +#include <linux/completion.h>
> > +#include <linux/delay.h>
> > +#include <linux/dev_printk.h>
> > +#include <linux/dma-mapping.h>
> > +#include <linux/errno.h>
> > +#include <linux/export.h>
> > +#include <linux/firmware.h>
> > +#include <linux/firmware/imx/se_api.h> #include <linux/genalloc.h>
> > +#include <linux/init.h> #include <linux/io.h> #include
> > +<linux/miscdevice.h> #include <linux/mod_devicetable.h> #include
> > +<linux/module.h> #include <linux/of_platform.h> #include
> > +<linux/of_reserved_mem.h> #include <linux/platform_device.h> #include
> > +<linux/slab.h> #include <linux/string.h> #include <linux/sys_soc.h>
> > +
> > +#include "ele_base_msg.h"
> > +#include "ele_common.h"
> > +#include "se_ctrl.h"
> > +
> > +#define RESERVED_DMA_POOL            BIT(0)
> > +#define MBOX_TX_NAME                 "tx"
> > +#define MBOX_RX_NAME                 "rx"
> > +
> > +struct se_if_node_info {
> > +     u8 se_if_id;
> > +     u8 se_if_did;
> > +     u8 max_dev_ctx;
> > +     u8 cmd_tag;
> > +     u8 rsp_tag;
> > +     u8 success_tag;
> > +     u8 base_api_ver;
> > +     u8 fw_api_ver;
> > +     u8 *se_name;
> > +     u8 *pool_name;
> > +     u8 *fw_name_in_rfs;
> > +     bool soc_register;
> > +     bool reserved_dma_ranges;
> > +     bool imem_mgmt;
> > +     int (*se_fetch_soc_info)(struct device *dev, u16 *soc_rev, u64
> > +*serial_num); };
> > +
> > +struct se_if_node_info_list {
> > +     u8 num_mu;
> > +     u16 soc_id;
> > +     struct se_if_node_info info[];
> > +};
> > +
> > +static const struct se_if_node_info_list imx8ulp_info = {
> > +     .num_mu = 1,
> > +     .soc_id = SOC_ID_OF_IMX8ULP,
> > +     .info = {
> > +                     {
> > +                     .se_if_id = 2,
> > +                     .se_if_did = 7,
> > +                     .max_dev_ctx = 4,
> > +                     .cmd_tag = 0x17,
> > +                     .rsp_tag = 0xe1,
> > +                     .success_tag = ELE_SUCCESS_IND,
> > +                     .base_api_ver = MESSAGING_VERSION_6,
> > +                     .fw_api_ver = MESSAGING_VERSION_7,
> > +                     .se_name = "hsm1",
> > +                     .pool_name = "sram",
> > +                     .fw_name_in_rfs = IMX_ELE_FW_DIR
> > +                                       "mx8ulpa2ext-ahab-container.img",
> > +                     .soc_register = true,
> > +                     .reserved_dma_ranges = true,
> > +                     .imem_mgmt = true,
> > +                     .se_fetch_soc_info = ele_fetch_soc_info,
> > +                     },
> > +     },
> > +};
> > +
> > +static const struct se_if_node_info_list imx93_info = {
> > +     .num_mu = 1,
> > +     .soc_id = SOC_ID_OF_IMX93,
> > +     .info = {
> > +                     {
> > +                     .se_if_id = 2,
> > +                     .se_if_did = 3,
> > +                     .max_dev_ctx = 4,
> > +                     .cmd_tag = 0x17,
> > +                     .rsp_tag = 0xe1,
> > +                     .success_tag = ELE_SUCCESS_IND,
> > +                     .base_api_ver = MESSAGING_VERSION_6,
> > +                     .fw_api_ver = MESSAGING_VERSION_7,
> > +                     .se_name = "hsm1",
> > +                     .reserved_dma_ranges = true,
> > +                     .soc_register = true,
> > +                     },
> > +     },
> > +};
> > +
> > +static const struct of_device_id se_match[] = {
> > +     { .compatible = "fsl,imx8ulp-se", .data = (void *)&imx8ulp_info},
> > +     { .compatible = "fsl,imx93-se", .data = (void *)&imx93_info},
> > +     {},
> > +};
> > +
> > +static const struct se_if_node_info
> > +     *get_se_if_node_info(const struct se_if_node_info_list *info_list,
> > +                           const u32 idx) {
> > +     if (idx > info_list->num_mu)
> > +             return NULL;
> > +
> > +     return &info_list->info[idx];
> > +}
> > +
> > +static int se_soc_info(struct se_if_priv *priv,
> > +                    const struct se_if_node_info_list *info_list) {
> > +     const struct se_if_node_info *info;
> > +     struct soc_device_attribute *attr;
> > +     struct soc_device *sdev;
> > +     u64 serial_num;
> > +     u16 soc_rev;
> > +     int err = 0;
> > +
> > +     info = priv->info;
> > +
> > +     /* This function should be called once.
> > +      * Check if the soc_rev is zero to continue.
> > +      */
> > +     if (priv->soc_rev)
> > +             return err;
> > +
> > +     if (info->se_fetch_soc_info) {
> > +             err = info->se_fetch_soc_info(priv->dev, &soc_rev, &serial_num);
> > +             if (err < 0) {
> > +                     dev_err(priv->dev, "Failed to fetch SoC Info.");
> > +                     return err;
> > +             }
> > +     } else {
> > +             dev_err(priv->dev, "Failed to fetch SoC revision.");
> > +             if (info->soc_register)
> > +                     dev_err(priv->dev, "Failed to do SoC registration.");
> > +             err = -EINVAL;
> > +             return err;
> > +     }
> > +
> > +     priv->soc_rev = soc_rev;
> > +     if (!info->soc_register)
> > +             return 0;
> > +
> > +     attr = devm_kzalloc(priv->dev, sizeof(*attr), GFP_KERNEL);
> > +     if (!attr)
> > +             return -ENOMEM;
> > +
> > +     if (FIELD_GET(DEV_GETINFO_MIN_VER_MASK, soc_rev))
> > +             attr->revision = devm_kasprintf(priv->dev, GFP_KERNEL, "%x.%x",
> > +                                             FIELD_GET(DEV_GETINFO_MIN_VER_MASK,
> > +                                                       soc_rev),
> > +                                             FIELD_GET(DEV_GETINFO_MAJ_VER_MASK,
> > +                                                       soc_rev));
> > +     else
> > +             attr->revision = devm_kasprintf(priv->dev, GFP_KERNEL, "%x",
> > +                                             FIELD_GET(DEV_GETINFO_MAJ_VER_MASK,
> > +                                                       soc_rev));
> > +
> > +     switch (info_list->soc_id) {
> > +     case SOC_ID_OF_IMX8ULP:
> > +             attr->soc_id = devm_kasprintf(priv->dev, GFP_KERNEL,
> > +                                           "i.MX8ULP");
> > +             break;
> > +     case SOC_ID_OF_IMX93:
> > +             attr->soc_id = devm_kasprintf(priv->dev, GFP_KERNEL,
> > +                                           "i.MX93");
> > +             break;
> > +     }
> > +
> > +     err = of_property_read_string(of_root, "model",
> > +                                   &attr->machine);
> > +     if (err)
> > +             return -EINVAL;
> > +
> > +     attr->family = devm_kasprintf(priv->dev, GFP_KERNEL, "Freescale
> > + i.MX");
> > +
> > +     attr->serial_number
> > +             = devm_kasprintf(priv->dev, GFP_KERNEL, "%016llX",
> > + serial_num);
> > +
> > +     sdev = soc_device_register(attr);
> > +     if (IS_ERR(sdev))
> > +             return PTR_ERR(sdev);
> > +
> > +     return 0;
> > +}
> > +
> > +/* interface for managed res to free a mailbox channel */ static void
> > +if_mbox_free_channel(void *mbox_chan) {
> > +     mbox_free_channel(mbox_chan);
> > +}
> > +
> > +static int se_if_request_channel(struct device *dev,
> > +                              struct mbox_chan **chan,
> > +                              struct mbox_client *cl,
> > +                              const char *name) {
> > +     struct mbox_chan *t_chan;
> > +     int ret = 0;
> > +
> > +     t_chan = mbox_request_channel_byname(cl, name);
> > +     if (IS_ERR(t_chan)) {
> > +             ret = PTR_ERR(t_chan);
> > +             return dev_err_probe(dev, ret,
> > +                                  "Failed to request %s channel.", name);
> > +     }
> > +
> > +     ret = devm_add_action(dev, if_mbox_free_channel, t_chan);
> > +     if (ret) {
> > +             dev_err(dev, "failed to add devm removal of mbox %s\n", name);
> > +             goto exit;
> > +     }
> > +
> > +     *chan = t_chan;
> > +
> > +exit:
> > +     return ret;
> > +}
> > +
> > +static void se_if_probe_cleanup(struct platform_device *pdev) {
> > +     struct device *dev = &pdev->dev;
> > +     struct se_if_priv *priv;
> > +
> > +     priv = dev_get_drvdata(dev);
> > +
> > +     /* In se_if_request_channel(), passed the clean-up functional
> > +      * pointer reference as action to devm_add_action().
> > +      * No need to free the mbox channels here.
> > +      */
> > +
> > +     /* free the buffer in se remove, previously allocated
> > +      * in se probe to store encrypted IMEM
> > +      */
> > +     if (priv->imem.buf) {
> > +             dmam_free_coherent(dev,
> > +                                ELE_IMEM_SIZE,
> > +                                priv->imem.buf,
> > +                                priv->imem.phyaddr);
> > +             priv->imem.buf = NULL;
> > +     }
> > +
> > +     /* No need to check, if reserved memory is allocated
> > +      * before calling for its release. Or clearing the
> > +      * un-set bit.
> > +      */
> > +     of_reserved_mem_device_release(dev);
> > +}
> > +
> > +static void se_load_firmware(const struct firmware *fw, void
> > +*context) {
> > +     struct se_if_priv *priv = (struct se_if_priv *) context;
> > +     const struct se_if_node_info *info = priv->info;
> > +     const u8 *se_fw_name = info->fw_name_in_rfs;
> > +     phys_addr_t se_fw_phyaddr;
> > +     u8 *se_fw_buf;
> > +
> > +     if (!fw) {
> > +             if (priv->fw_fail > MAX_FW_LOAD_RETRIES)
> > +                     dev_dbg(priv->dev,
> > +                              "External FW not found, using ROM
> > + FW.\n");
> Isn't it true that if only one branch of a conditional statement contains a single
> statement, you should use braces in both branches?

There was no checkpatch error for this.

> > +             else {
> > +                     /*add a bit delay to wait for firmware priv released */
> > +                     msleep(20);
> > +
> > +                     /* Load firmware one more time if timeout */
> > +                     request_firmware_nowait(THIS_MODULE,
> > +                                     FW_ACTION_UEVENT, info->fw_name_in_rfs,
> > +                                     priv->dev, GFP_KERNEL, priv,
> > +                                     se_load_firmware);
> > +                     priv->fw_fail++;
> > +                     dev_dbg(priv->dev, "Value of retries = 0x%x.\n",
> > +                             priv->fw_fail);
> > +             }
> > +
> > +             return;
> > +     }
> > +
> > +     /* allocate buffer to store the SE FW */
> > +     se_fw_buf = dma_alloc_coherent(priv->dev, fw->size,
> > +                                    &se_fw_phyaddr, GFP_KERNEL);
> > +     if (!se_fw_buf)
> > +             goto exit;
> > +
> > +     memcpy(se_fw_buf, fw->data, fw->size);
> > +
> > +     if (ele_fw_authenticate(priv->dev, se_fw_phyaddr))
> > +             dev_err(priv->dev,
> > +                     "Failed to authenticate & load SE firmware %s.\n",
> > +                     se_fw_name);
> > +
> > +     dma_free_coherent(priv->dev,
> > +                        fw->size,
> > +                        se_fw_buf,
> > +                        se_fw_phyaddr);
> > +
> > +exit:
> > +     release_firmware(fw);
> > +}
> > +
> > +static int se_if_probe(struct platform_device *pdev) {
> > +     const struct se_if_node_info_list *info_list;
> > +     const struct se_if_node_info *info;
> > +     struct device *dev = &pdev->dev;
> > +     struct se_if_priv *priv;
> > +     u32 idx;
> > +     int ret;
> > +
> > +     if (of_property_read_u32(dev->of_node, "reg", &idx)) {
> > +             ret = -EINVAL;
> > +             goto exit;
> > +     }
> > +
> > +     info_list = device_get_match_data(dev);
> > +     info = get_se_if_node_info(info_list, idx);
> > +     if (!info) {
> > +             ret = -EINVAL;
> > +             goto exit;
> > +     }
> > +
> > +     priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> > +     if (!priv) {
> > +             ret = -ENOMEM;
> > +             goto exit;
> > +     }
> > +
> > +     dev_set_drvdata(dev, priv);
> > +
> > +     /* Mailbox client configuration */
> > +     priv->se_mb_cl.dev              = dev;
> > +     priv->se_mb_cl.tx_block         = false;
> > +     priv->se_mb_cl.knows_txdone     = true;
> > +     priv->se_mb_cl.rx_callback      = se_if_rx_callback;
> > +
> > +     ret = se_if_request_channel(dev, &priv->tx_chan,
> > +                     &priv->se_mb_cl, MBOX_TX_NAME);
> > +     if (ret)
> > +             goto exit;
> > +
> > +     ret = se_if_request_channel(dev, &priv->rx_chan,
> > +                     &priv->se_mb_cl, MBOX_RX_NAME);
> > +     if (ret)
> > +             goto exit;
> > +
> > +     priv->dev = dev;
> > +     priv->info = info;
> > +
> > +     mutex_init(&priv->se_if_lock);
> > +     mutex_init(&priv->se_if_cmd_lock);
> > +
> > +     /*
> > +      * Initialized priv->cmd_receiver_dev and
> > +      * priv->waiting_rsp_dev = NULL;
> > +      */
> > +     priv->max_dev_ctx = info->max_dev_ctx;
> > +     priv->cmd_tag = info->cmd_tag;
> > +     priv->rsp_tag = info->rsp_tag;
> > +     if (info->pool_name) {
> > +             priv->mem_pool = of_gen_pool_get(dev->of_node,
> > +                                              info->pool_name, 0);
> > +             if (!priv->mem_pool) {
> > +                     dev_err(dev,
> > +                             "Unable to get sram pool = %s\n",
> > +                             info->pool_name);
> > +                     return 0;
> > +             }
> > +     }
> > +     priv->success_tag = info->success_tag;
> > +     priv->base_api_ver = info->base_api_ver;
> > +     priv->fw_api_ver = info->fw_api_ver;
> > +
> > +     init_completion(&priv->done);
> > +     spin_lock_init(&priv->lock);
> > +
> > +     if (info->reserved_dma_ranges) {
> > +             ret = of_reserved_mem_device_init(dev);
> > +             if (ret) {
> > +                     dev_err(dev,
> > +                             "failed to init reserved memory region %d\n",
> > +                             ret);
> > +                     goto exit;
> > +             }
> > +     }
> > +
> > +     ret = se_soc_info(priv, info_list);
> > +     if (ret) {
> > +             dev_err(dev,
> > +                     "failed[%pe] to fetch SoC Info\n", ERR_PTR(ret));
> > +             goto exit;
> > +     }
> > +
> > +     if (info->imem_mgmt) {
> > +             /* allocate buffer where SE store encrypted IMEM */
> > +             priv->imem.buf = dmam_alloc_coherent(dev, ELE_IMEM_SIZE,
> > +                                                  &priv->imem.phyaddr,
> > +                                                  GFP_KERNEL);
> > +             if (!priv->imem.buf) {
> > +                     dev_err(dev,
> > +                             "dmam-alloc-failed: To store encr-IMEM.\n");
> > +                     ret = -ENOMEM;
> > +                     goto exit;
> > +             }
> > +     }
> > +
> > +     if (info->fw_name_in_rfs) {
> > +             ret = request_firmware_nowait(THIS_MODULE,
> > +                                           FW_ACTION_UEVENT,
> > +                                           info->fw_name_in_rfs,
> > +                                           dev, GFP_KERNEL, priv,
> > +                                           se_load_firmware);
> > +             if (ret)
> > +                     dev_warn(dev, "Failed to get firmware [%s].\n",
> > +                              info->fw_name_in_rfs);
> > +             ret = 0;
> > +     }
> > +
> > +     dev_info(dev, "i.MX secure-enclave: %s interface to firmware,
> configured.\n",
> > +              info->se_name);
> > +     return ret;
> > +
> > +exit:
> > +     /* if execution control reaches here, if probe fails.
> > +      * hence doing the cleanup
> > +      */
> > +     se_if_probe_cleanup(pdev);
> > +
> > +     return ret;
> > +}
> > +
> > +static int se_if_remove(struct platform_device *pdev) {
> > +     se_if_probe_cleanup(pdev);
> > +
> > +     return 0;
> > +}
> > +
> > +static int se_suspend(struct device *dev) {
> > +     struct se_if_priv *priv = dev_get_drvdata(dev);
> > +     const struct se_if_node_info *info = priv->info;
> > +     int ret = 0;
> > +
> > +     if (info && info->imem_mgmt) {
> > +             ret = se_save_imem_state(priv);
> > +             if (ret < 0)
> > +                     goto exit;
> > +             priv->imem.size = ret;
> > +     }
> > +exit:
> > +     return ret;
> > +}
> > +
> > +static int se_resume(struct device *dev) {
> > +     struct se_if_priv *priv = dev_get_drvdata(dev);
> > +     const struct se_if_node_info *info = priv->info;
> > +
> > +     if (info && info->imem_mgmt)
> > +             se_restore_imem_state(priv);
> > +
> > +     return 0;
> > +}
> > +
> > +static const struct dev_pm_ops se_pm = {
> > +     RUNTIME_PM_OPS(se_suspend, se_resume, NULL) };
> > +
> > +static struct platform_driver se_driver = {
> > +     .driver = {
> > +             .name = "fsl-se-fw",
> > +             .of_match_table = se_match,
> > +             .pm = &se_pm,
> > +     },
> > +     .probe = se_if_probe,
> > +     .remove = se_if_remove,
> > +};
> > +MODULE_DEVICE_TABLE(of, se_match);
> > +
> > +module_platform_driver(se_driver);
> > +
> > +MODULE_AUTHOR("Pankaj Gupta <pankaj.gupta@....com>");
> > +MODULE_DESCRIPTION("iMX Secure Enclave Driver.");
> > +MODULE_LICENSE("GPL");
> > diff --git a/drivers/firmware/imx/se_ctrl.h
> > b/drivers/firmware/imx/se_ctrl.h new file mode 100644 index
> > 000000000000..4be2235d2170
> > --- /dev/null
> > +++ b/drivers/firmware/imx/se_ctrl.h
> > @@ -0,0 +1,83 @@
> > +/* SPDX-License-Identifier: GPL-2.0+ */
> > +/*
> > + * Copyright 2024 NXP
> > + */
> > +
> > +#ifndef SE_MU_H
> > +#define SE_MU_H
> > +
> > +#include <linux/miscdevice.h>
> > +#include <linux/semaphore.h>
> > +#include <linux/mailbox_client.h>
> > +
> > +#define MAX_FW_LOAD_RETRIES          50
> > +
> > +#define RES_STATUS(x)                        FIELD_GET(0x000000ff, x)
> > +#define MESSAGING_VERSION_6          0x6
> > +#define MESSAGING_VERSION_7          0x7
> > +
> > +struct se_imem_buf {
> > +     u8 *buf;
> > +     phys_addr_t phyaddr;
> > +     u32 size;
> > +};
> > +
> > +/* Header of the messages exchange with the EdgeLock Enclave */
> > +struct se_msg_hdr {
> > +     u8 ver;
> > +     u8 size;
> > +     u8 command;
> > +     u8 tag;
> > +}  __packed;
> > +
> > +#define SE_MU_HDR_SZ 4
> > +
> > +struct se_api_msg {
> > +     struct se_msg_hdr header;
> > +     u32 data[];
> > +};
> > +
> > +struct se_if_priv {
> > +     struct se_if_device_ctx *cmd_receiver_dev;
> > +     /* Update to the waiting_rsp_dev, to be protected
> > +      * under se_if_lock.
> > +      */
> > +     struct se_if_device_ctx *waiting_rsp_dev;
> > +     /*
> > +      * prevent parallel access to the se interface registers
> > +      * e.g. a user trying to send a command while the other one is
> > +      * sending a response.
> > +      */
> > +     struct mutex se_if_lock;
> > +     /*
> > +      * prevent a command to be sent on the se interface while another one is
> > +      * still processing. (response to a command is allowed)
> > +      */
> > +     struct mutex se_if_cmd_lock;
> > +     struct device *dev;
> > +     struct gen_pool *mem_pool;
> > +     u8 cmd_tag;
> > +     u8 rsp_tag;
> > +     u8 success_tag;
> > +     u8 base_api_ver;
> > +     u8 fw_api_ver;
> > +     u32 fw_fail;
> > +     u16 soc_rev;
> > +     const void *info;
> > +
> > +     struct mbox_client se_mb_cl;
> > +     struct mbox_chan *tx_chan, *rx_chan;
> > +
> > +     /* Assignment of the rx_msg buffer to held till the
> > +      * received content as part callback function, is copied.
> > +      */
> > +     struct se_api_msg *rx_msg;
> > +     u32 rx_msg_sz;
> > +     struct completion done;
> > +     spinlock_t lock;
> > +     u8 max_dev_ctx;
> > +     struct se_if_device_ctx **ctxs;
> > +     struct se_imem_buf imem;
> > +};
> > +
> > +#endif
> > diff --git a/include/linux/firmware/imx/se_api.h
> > b/include/linux/firmware/imx/se_api.h
> > new file mode 100644
> > index 000000000000..c47f84906837
> > --- /dev/null
> > +++ b/include/linux/firmware/imx/se_api.h
> > @@ -0,0 +1,14 @@
> > +/* SPDX-License-Identifier: GPL-2.0+ */
> > +/*
> > + * Copyright 2024 NXP
> > + */
> > +
> > +#ifndef __SE_API_H__
> > +#define __SE_API_H__
> > +
> > +#include <linux/types.h>
> > +
> > +#define SOC_ID_OF_IMX8ULP            0x084D
> > +#define SOC_ID_OF_IMX93                      0x9300
> > +
> > +#endif /* __SE_API_H__ */
> >
> > --
> > 2.34.1
> >
> >

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