[v5,4/5] firmware: imx: add driver for NXP EdgeLock Enclave

Commit Message

Pankaj Gupta July 12, 2024, 6:19 a.m. UTC

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 <[e-mail]>
---
 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(+)

Comments

Markus Elfring July 12, 2024, 6:42 p.m. UTC | #1

…
> +++ b/drivers/firmware/imx/ele_common.c
> @@ -0,0 +1,264 @@
…
> +int ele_msg_send(struct se_if_priv *priv, void *tx_msg)
> +{
…
> +	if (header->tag == priv->cmd_tag)
> +		lockdep_assert_held(&priv->se_if_cmd_lock);
> +
> +	scoped_guard(mutex, &priv->se_if_lock);
…

I interpret the documentation for this programming interface in the way
that such code may usually be used together with a (compound) statement.
https://elixir.bootlin.com/linux/v6.10-rc7/source/include/linux/cleanup.h#L137

How do you think about to apply a statement like “guard(mutex)(&priv->se_if_lock);” instead?
https://elixir.bootlin.com/linux/v6.10-rc7/source/include/linux/mutex.h#L196

Regards,
Markus

Amit Singh Tomar July 13, 2024, 5:56 p.m. UTC | #2

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 <[e-mail]>
> ---
>    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.
> +		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?
> +		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 <[e-mail]>");
> +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
> 
>

Pankaj Gupta July 15, 2024, 9:02 a.m. UTC | #3

> -----Original Message-----
> From: Amit Singh Tomar <[e-mail]>
> Sent: Saturday, July 13, 2024 11:26 PM
> To: Pankaj Gupta <[e-mail]>; Jonathan Corbet
> <[e-mail]>; Rob Herring <[e-mail]>; Krzysztof Kozlowski
> <[e-mail]>; Conor Dooley <[e-mail]>; Shawn Guo
> <[e-mail]>; Sascha Hauer <[e-mail]>;
> Pengutronix Kernel Team <[e-mail]>; Fabio Estevam
> <[e-mail]>; Rob Herring <[e-mail]>
> Cc: [e-mail]; [e-mail];
> [e-mail]; [e-mail]; linux-arm-
> [e-mail]
> 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 <[e-mail]>
> > ---
> >    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 <[e-mail]>");
> > +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
> >
> >

Amit Singh Tomar July 16, 2024, 3:20 a.m. UTC | #4

On 7/15/2024 2:32 PM, Pankaj Gupta wrote:
>> 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 <[e-mail]>
>> > ---
>> >    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.
The previous comment suggested using ret = -ENOMEM; followed by goto 
exit;. However, in this case, you can simply return -ENOMEM, which will 
save an extra statement.
> 
>> > +             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 <[e-mail]>");
>> > +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
>> >
>> >
>

Patch

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>
+
+#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;
+		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");
+		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 <[e-mail]>");
+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__ */