Re: [PATCH 4/4] firmware: imx: add driver for NXP EdgeLock Enclave

[Amit Singh Tomar <amitsinght@marvell.com>]

Hi,
> 
> ----------------------------------------------------------------------
> On Fri, May 10, 2024 at 06:57:30PM +0530, 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,
>> both from:
>> - User-Space Applications via character driver.
>> - Kernel-space, used by kernel management layers like DM-Crypt.
>>
>> ABI documentation for the NXP secure-enclave driver.
>>
>> User-space library using this driver:
>> - i.MX Secure Enclave library:
>>    -- URL: https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_nxp-2Dimx_imx-2Dsecure-2Denclave.git&d=DwICAg&c=nKjWec2b6R0mOyPaz7xtfQ&r=V_GK7jRuCHDErm6txmgDK1-MbUihtnSQ3gPgB-A-JKU&m=eKFfdy51aVVEAe4I9Lk2CN77y_4Hxf2pI_9fv5pVWLo9DwQNgCpca6smAwvwFycf&s=IfKbvjSfdUcqz-WEWdhbj1_TnqGryOffX1dV0T5Rf_A&e= ,
>> - i.MX Secure Middle-Ware:
>>    -- URL: https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_nxp-2Dimx_imx-2Dsmw.git&d=DwICAg&c=nKjWec2b6R0mOyPaz7xtfQ&r=V_GK7jRuCHDErm6txmgDK1-MbUihtnSQ3gPgB-A-JKU&m=eKFfdy51aVVEAe4I9Lk2CN77y_4Hxf2pI_9fv5pVWLo9DwQNgCpca6smAwvwFycf&s=LLz2plXTM1AS-zJ1HlZRKiBE8GmRJBduR_0dnOuFjRo&e=
>>
>> Signed-off-by: Pankaj Gupta <pankaj.gupta@nxp.com>
>> ---
>>   Documentation/ABI/testing/se-cdev   |   42 ++
>>   drivers/firmware/imx/Kconfig        |   12 +
>>   drivers/firmware/imx/Makefile       |    2 +
>>   drivers/firmware/imx/ele_base_msg.c |  287 ++++++++
>>   drivers/firmware/imx/ele_base_msg.h |   70 ++
>>   drivers/firmware/imx/ele_common.c   |  341 +++++++++
>>   drivers/firmware/imx/ele_common.h   |   43 ++
>>   drivers/firmware/imx/se_ctrl.c      | 1339 +++++++++++++++++++++++++++++++++++
>>   drivers/firmware/imx/se_ctrl.h      |  151 ++++
>>   include/linux/firmware/imx/se_api.h |   14 +
>>   include/uapi/linux/se_ioctl.h       |   88 +++
>>   11 files changed, 2389 insertions(+)
>>
>> diff --git a/Documentation/ABI/testing/se-cdev b/Documentation/ABI/testing/se-cdev
>> new file mode 100644
>> index 000000000000..699525af6b86
>> --- /dev/null
>> +++ b/Documentation/ABI/testing/se-cdev
>> @@ -0,0 +1,42 @@
>> +What:		/dev/<se>_mu[0-9]+_ch[0-9]+
>> +Date:		May 2024
>> +KernelVersion:	6.8
>> +Contact:	linux-imx@nxp.com, pankaj.gupta@nxp.com
>> +Description:
>> +		NXP offers multiple hardware IP(s) for  secure-enclaves like EdgeLock-
>> +		Enclave(ELE), SECO. The character device file-descriptors
>> +		/dev/<se>_mu*_ch* are the interface between user-space NXP's secure-
>> +		enclave shared-library and the kernel driver.
>> +
>> +		The ioctl(2)-based ABI is defined and documented in
>> +		[include]<linux/firmware/imx/ele_mu_ioctl.h>
>> +		 ioctl(s) are used primarily for:
>> +			- shared memory management
>> +			- allocation of I/O buffers
>> +			- get mu info
>> +			- setting a dev-ctx as receiver that is slave to fw
>> +			- get SoC info
>> +
>> +		The following file operations are supported:
>> +
>> +		open(2)
>> +		  Currently the only useful flags are O_RDWR.
>> +
>> +		read(2)
>> +		  Every read() from the opened character device context is waiting on
>> +		  wakeup_intruptible, that gets set by the registered mailbox callback
>> +		  function; indicating a message received from the firmware on message-
>> +		  unit.
>> +
>> +		write(2)
>> +		  Every write() to the opened character device context needs to acquire
>> +		  mailbox_lock, before sending message on to the message unit.
>> +
>> +		close(2)
>> +		  Stops and free up the I/O contexts that was associated
>> +		  with the file descriptor.
>> +
>> +Users:		https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_nxp-2Dimx_imx-2Dsecure-2Denclave.git&d=DwICAg&c=nKjWec2b6R0mOyPaz7xtfQ&r=V_GK7jRuCHDErm6txmgDK1-MbUihtnSQ3gPgB-A-JKU&m=eKFfdy51aVVEAe4I9Lk2CN77y_4Hxf2pI_9fv5pVWLo9DwQNgCpca6smAwvwFycf&s=IfKbvjSfdUcqz-WEWdhbj1_TnqGryOffX1dV0T5Rf_A&e= ,
>> +		https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_nxp-2Dimx_imx-2Dsmw.git&d=DwICAg&c=nKjWec2b6R0mOyPaz7xtfQ&r=V_GK7jRuCHDErm6txmgDK1-MbUihtnSQ3gPgB-A-JKU&m=eKFfdy51aVVEAe4I9Lk2CN77y_4Hxf2pI_9fv5pVWLo9DwQNgCpca6smAwvwFycf&s=LLz2plXTM1AS-zJ1HlZRKiBE8GmRJBduR_0dnOuFjRo&e=
>> +		crypto/skcipher,
>> +		drivers/nvmem/imx-ocotp-ele.c
>> diff --git a/drivers/firmware/imx/Kconfig b/drivers/firmware/imx/Kconfig
>> index 183613f82a11..56bdca9bd917 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..0463f26d93c7
>> --- /dev/null
>> +++ b/drivers/firmware/imx/ele_base_msg.c
>> @@ -0,0 +1,287 @@
>> +// SPDX-License-Identifier: GPL-2.0+
>> +/*
>> + * Copyright 2024 NXP
>> + */
>> +
>> +#include <linux/types.h>
>> +#include <linux/completion.h>
>> +#include <linux/dma-mapping.h>
>> +
>> +#include "ele_base_msg.h"
>> +#include "ele_common.h"
>> +
>> +int ele_get_info(struct device *dev, struct soc_info *s_info)
>> +{
>> +	struct se_if_priv *priv = dev_get_drvdata(dev);
>> +	struct se_api_msg *tx_msg __free(kfree);
>> +	struct se_api_msg *rx_msg __free(kfree);
>> +	phys_addr_t get_info_addr;
>> +	u32 *get_info_data;
>> +	u32 status;
>> +	int ret;
>> +
>> +	if (!priv || !s_info)
>> +		goto exit;
>> +
>> +	memset(s_info, 0x0, sizeof(*s_info));
>> +
>> +	if (priv->mem_pool_name)
>> +		get_info_data = get_phy_buf_mem_pool(dev,
>> +						     priv->mem_pool_name,
>> +						     &get_info_addr,
>> +						     ELE_GET_INFO_BUFF_SZ);
>> +	else
>> +		get_info_data = dmam_alloc_coherent(dev,
>> +						    ELE_GET_INFO_BUFF_SZ,
>> +						    &get_info_addr,
>> +						    GFP_KERNEL);
>> +	if (!get_info_data) {
>> +		ret = -ENOMEM;
>> +		dev_err(dev,
>> +			"%s: Failed to allocate get_info_addr.\n",
>> +			__func__);
>> +		goto exit;
>> +	}
>> +
>> +	tx_msg = kzalloc(ELE_GET_INFO_REQ_MSG_SZ << 2, GFP_KERNEL);
>> +	if (!tx_msg) {
>> +		ret = -ENOMEM;
>> +		return ret;
It seems like you intended to use goto exit; instead of returning 
directly from here. This would ensure that you can free the buffer 
allocated with get_phy_buf_mem_pool in case of an allocation failure.
>> +	}
>> +
>> +	rx_msg = kzalloc(ELE_GET_INFO_RSP_MSG_SZ << 2, GFP_KERNEL);
>> +	if (!rx_msg) {
>> +		ret = -ENOMEM;
>> +		return ret;
>> +	}
>> +
>> +	ret = plat_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] = ELE_GET_INFO_READ_SZ;
>> +	priv->rx_msg = rx_msg;
>> +	ret = imx_ele_msg_send_rcv(priv, tx_msg);
>> +	if (ret < 0)
>> +		goto exit;
>> +
>> +	ret  = validate_rsp_hdr(priv,
>> +				priv->rx_msg->header,
>> +				ELE_GET_INFO_REQ,
>> +				ELE_GET_INFO_RSP_MSG_SZ,
>> +				true);
>> +	if (ret)
>> +		goto exit;
>> +
>> +	status = RES_STATUS(priv->rx_msg->data[0]);
>> +	if (status != priv->success_tag) {
>> +		dev_err(dev, "Command Id[%d], Response Failure = 0x%x",
>> +			ELE_GET_INFO_REQ, status);
>> +		ret = -1;
>> +	}
>> +
>> +	s_info->imem_state = (get_info_data[ELE_IMEM_STATE_WORD]
>> +				& ELE_IMEM_STATE_MASK) >> 16;
>> +	s_info->major_ver = (get_info_data[GET_INFO_SOC_INFO_WORD_OFFSET]
>> +				& SOC_VER_MASK) >> 24;
>> +	s_info->minor_ver = ((get_info_data[GET_INFO_SOC_INFO_WORD_OFFSET]
>> +				& SOC_VER_MASK) >> 16) & 0xFF;
>> +	s_info->soc_rev = (get_info_data[GET_INFO_SOC_INFO_WORD_OFFSET]
>> +				& SOC_VER_MASK) >> 16;
>> +	s_info->soc_id = get_info_data[GET_INFO_SOC_INFO_WORD_OFFSET]
>> +				& SOC_ID_MASK;
>> +	s_info->serial_num
>> +		= (u64)get_info_data[GET_INFO_SL_NUM_MSB_WORD_OFF] << 32
>> +			| get_info_data[GET_INFO_SL_NUM_LSB_WORD_OFF];
>> +exit:
>> +	if (get_info_addr) {
>> +		if (priv->mem_pool_name)
>> +			free_phybuf_mem_pool(dev, priv->mem_pool_name,
>> +					     get_info_data, ELE_GET_INFO_BUFF_SZ);
>> +		else
>> +			dmam_free_coherent(dev,
>> +					   ELE_GET_INFO_BUFF_SZ,
>> +					   get_info_data,
>> +					   get_info_addr);
>> +	}
>> +
>> +	return ret;
>> +}
>> +
>> +int ele_ping(struct device *dev)
>> +{
>> +	struct se_if_priv *priv = dev_get_drvdata(dev);
>> +	struct se_api_msg *tx_msg __free(kfree);
>> +	struct se_api_msg *rx_msg __free(kfree);
> 
> If you want __free(kfree) it should be
> 
> struct se_api_msg *tx_msg __free(kfree) = NULL;
> struct se_api_msg *rx_msg __free(kfree) = NULL;
> 
> Or
> 
> struct se_api_msg *tx_msg __free(kfree) = kzalloc(ELE_PING_REQ_SZ << 2, GFP_KERNEL)
> struct se_api_msg *rx_msg __free(kfree) = kzalloc(ELE_PING_RSP_SZ << 2, GFP_KERNEL)
> 
> otherwise when
>   if (!tx_msg) {
>               return ret;
> 
> 	    ^^ when go here, rx_msg is random value. So kfree(rx_msg) will
> access random address.
>                                               
>   }
> 
>> +	u32 status;
>> +	int ret;
>> +
>> +	tx_msg = kzalloc(ELE_PING_REQ_SZ << 2, GFP_KERNEL);
>> +	if (!tx_msg) {
>> +		ret = -ENOMEM;
>> +		return ret;
> 
> 
> return -ENOMEM
> 
> Frank
> 
>> +	}
>> +
>> +	rx_msg = kzalloc(ELE_PING_RSP_SZ << 2, GFP_KERNEL);
>> +	if (!rx_msg) {
>> +		ret = -ENOMEM;
>> +		return ret;
>> +	}
>> +
>> +	ret = plat_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: plat_fill_cmd_msg_hdr failed.\n");
>> +		goto exit;
>> +	}
>> +
>> +	priv->rx_msg = rx_msg;
>> +	ret = imx_ele_msg_send_rcv(priv, tx_msg);
>> +	if (ret)
>> +		goto exit;
>> +
>> +	ret  = validate_rsp_hdr(priv,
>> +				priv->rx_msg->header,
>> +				ELE_PING_REQ,
>> +				ELE_PING_RSP_SZ,
>> +				true);
>> +	if (ret)
>> +		goto exit;
>> +
>> +	status = RES_STATUS(priv->rx_msg->data[0]);
>> +	if (status != priv->success_tag) {
>> +		dev_err(dev, "Command Id[%d], Response Failure = 0x%x",
>> +			ELE_PING_REQ, status);
>> +		ret = -1;
>> +	}
>> +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);
>> +	struct se_api_msg *rx_msg __free(kfree);
>> +	u32 status;
>> +	int ret;
>> +
>> +	tx_msg = kzalloc(ELE_SERVICE_SWAP_REQ_MSG_SZ << 2, GFP_KERNEL);
>> +	if (!tx_msg) {
>> +		ret = -ENOMEM;
>> +		return ret;
>> +	}
>> +
>> +	rx_msg = kzalloc(ELE_SERVICE_SWAP_RSP_MSG_SZ << 2, GFP_KERNEL);
>> +	if (!rx_msg) {
>> +		ret = -ENOMEM;
>> +		return ret;
>> +	}
>> +
>> +	ret = plat_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] = plat_add_msg_crc((uint32_t *)&tx_msg[0],
>> +						 ELE_SERVICE_SWAP_REQ_MSG_SZ);
>> +	priv->rx_msg = rx_msg;
>> +	ret = imx_ele_msg_send_rcv(priv, tx_msg);
>> +	if (ret < 0)
>> +		goto exit;
>> +
>> +	ret  = validate_rsp_hdr(priv,
>> +				priv->rx_msg->header,
>> +				ELE_SERVICE_SWAP_REQ,
>> +				ELE_SERVICE_SWAP_RSP_MSG_SZ,
>> +				true);
>> +	if (ret)
>> +		goto exit;
>> +
>> +	status = RES_STATUS(priv->rx_msg->data[0]);
>> +	if (status != priv->success_tag) {
>> +		dev_err(dev, "Command Id[%d], Response Failure = 0x%x",
>> +			ELE_SERVICE_SWAP_REQ, status);
>> +		ret = -1;
>> +	} else {
>> +		if (flag == ELE_IMEM_EXPORT)
>> +			ret = priv->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);
>> +	struct se_api_msg *rx_msg __free(kfree);
>> +	u32 status;
>> +	int ret;
>> +
>> +	tx_msg = kzalloc(ELE_FW_AUTH_REQ_SZ << 2, GFP_KERNEL);
>> +	if (!tx_msg) {
>> +		ret = -ENOMEM;
>> +		return ret;
>> +	}
>> +
>> +	rx_msg = kzalloc(ELE_FW_AUTH_RSP_MSG_SZ << 2, GFP_KERNEL);
>> +	if (!rx_msg) {
>> +		ret = -ENOMEM;
>> +		return ret;
>> +	}
>> +	ret = plat_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[0] = addr;
>> +	tx_msg->data[1] = 0x0;
>> +	tx_msg->data[2] = addr;
>> +
>> +	priv->rx_msg = rx_msg;
>> +	ret = imx_ele_msg_send_rcv(priv, tx_msg);
>> +	if (ret < 0)
>> +		goto exit;
>> +
>> +	ret  = validate_rsp_hdr(priv,
>> +				priv->rx_msg->header,
>> +				ELE_FW_AUTH_REQ,
>> +				ELE_FW_AUTH_RSP_MSG_SZ,
>> +				true);
>> +	if (ret)
>> +		goto exit;
>> +
>> +	status = RES_STATUS(priv->rx_msg->data[0]);
>> +	if (status != priv->success_tag) {
>> +		dev_err(dev, "Command Id[%d], Response Failure = 0x%x",
>> +			ELE_FW_AUTH_REQ, status);
>> +		ret = -1;
>> +	}
>> +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..3b3d2bf04a84
>> --- /dev/null
>> +++ b/drivers/firmware/imx/ele_base_msg.h
>> @@ -0,0 +1,70 @@
>> +/* 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_SUCCESS_IND			0xD6
>> +
>> +#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 ELE_GET_INFO_READ_SZ		0xA0
>> +
>> +#define DEFAULT_IMX_SOC_VER		0xA0
>> +#define SOC_VER_MASK			0xFFFF0000
>> +#define SOC_ID_MASK			0x0000FFFF
>> +struct soc_info {
>> +	u32 imem_state;
>> +	u8 major_ver;
>> +	u8 minor_ver;
>> +	u16 soc_id;
>> +	u16 soc_rev;
>> +	u64 serial_num;
>> +};
>> +
>> +#define GET_INFO_SOC_INFO_WORD_OFFSET	1
>> +#define GET_INFO_UUID_WORD_OFFSET	3
>> +#define GET_INFO_SL_NUM_MSB_WORD_OFF \
>> +	(GET_INFO_UUID_WORD_OFFSET + 3)
>> +#define GET_INFO_SL_NUM_LSB_WORD_OFF \
>> +	(GET_INFO_UUID_WORD_OFFSET + 0)
>> +
>> +#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 soc_info *s_info);
>> +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..dcf7f9034653
>> --- /dev/null
>> +++ b/drivers/firmware/imx/ele_common.c
>> @@ -0,0 +1,341 @@
>> +// SPDX-License-Identifier: GPL-2.0+
>> +/*
>> + * Copyright 2024 NXP
>> + */
>> +
>> +#include "ele_base_msg.h"
>> +#include "ele_common.h"
>> +
>> +u32 plat_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 imx_ele_msg_rcv(struct se_if_priv *priv)
>> +{
>> +	u32 wait;
>> +	int err;
>> +
>> +	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;
>> +	}
>> +
>> +	mutex_unlock(&priv->se_if_cmd_lock);
>> +	priv->no_dev_ctx_used = false;
>> +
>> +	return err;
>> +}
>> +
>> +int imx_ele_msg_send(struct se_if_priv *priv, void *mssg)
>> +{
>> +	bool is_cmd_lock_tobe_taken = false;
>> +	int err;
>> +
>> +	if (!priv->waiting_rsp_dev || priv->no_dev_ctx_used) {
>> +		is_cmd_lock_tobe_taken = true;
>> +		mutex_lock(&priv->se_if_cmd_lock);
>> +	}
>> +	scoped_guard(mutex, &priv->se_if_lock);
>> +
>> +	err = mbox_send_message(priv->tx_chan, mssg);
>> +	if (err < 0) {
>> +		dev_err(priv->dev, "Error: mbox_send_message failure.\n");
>> +		if (is_cmd_lock_tobe_taken)
>> +			mutex_unlock(&priv->se_if_cmd_lock);
>> +		return err;
>> +	}
>> +	err = 0;
>> +
>> +	return err;
>> +}
>> +
>> +int imx_ele_msg_send_rcv(struct se_if_priv *priv, void *mssg)
>> +{
>> +	int err;
>> +
>> +	priv->no_dev_ctx_used = true;
>> +	err = imx_ele_msg_send(priv, mssg);
>> +	if (err)
>> +		goto exit;
>> +
>> +	err = imx_ele_msg_rcv(priv);
>> +
>> +exit:
>> +	return err;
>> +}
>> +
>> +int imx_ele_miscdev_msg_rcv(struct se_if_device_ctx *dev_ctx)
>> +{
>> +	struct se_msg_hdr header = {0};
>> +	int err;
>> +
>> +	err = wait_event_interruptible(dev_ctx->wq, dev_ctx->pending_hdr != 0);
>> +	if (err)
>> +		dev_err(dev_ctx->dev,
>> +			"%s: Err[0x%x]:Interrupted by signal.\n",
>> +			dev_ctx->miscdev.name, err);
>> +
>> +	header = *((struct se_msg_hdr *) (&dev_ctx->temp_resp[0]));
>> +
>> +	if (header.tag == dev_ctx->priv->rsp_tag)
>> +		mutex_unlock(&dev_ctx->priv->se_if_cmd_lock);
>> +
>> +	return err;
>> +}
>> +
>> +int imx_ele_miscdev_msg_send(struct se_if_device_ctx *dev_ctx,
>> +			     void *tx_msg, int tx_msg_sz)
>> +{
>> +	struct se_if_priv *priv = dev_ctx->priv;
>> +	struct se_msg_hdr header = {0};
>> +	int err;
>> +
>> +	header = *((struct se_msg_hdr *) tx_msg);
>> +
>> +	/*
>> +	 * Check that the size passed as argument matches the size
>> +	 * carried in the message.
>> +	 */
>> +	err = header.size << 2;
>> +
>> +	if (err != tx_msg_sz) {
>> +		err = -EINVAL;
>> +		dev_err(priv->dev,
>> +			"%s: User buffer too small\n",
>> +				dev_ctx->miscdev.name);
>> +		goto exit;
>> +	}
>> +	/* Check the message is valid according to tags */
>> +	if (header.tag == priv->cmd_tag)
>> +		priv->waiting_rsp_dev = dev_ctx;
>> +	else if (header.tag == priv->rsp_tag) {
>> +		/* Check the device context can send the command */
>> +		if (dev_ctx != priv->cmd_receiver_dev) {
>> +			dev_err(priv->dev,
>> +				"%s: Channel not configured to send resp to FW.",
>> +				dev_ctx->miscdev.name);
>> +			err = -EPERM;
>> +			goto exit;
>> +		}
>> +	} else {
>> +		dev_err(priv->dev,
>> +			"%s: The message does not have a valid TAG\n",
>> +				dev_ctx->miscdev.name);
>> +		err = -EINVAL;
>> +		goto exit;
>> +	}
>> +	err = imx_ele_msg_send(priv, tx_msg);
>> +exit:
>> +	return err;
>> +}
>> +
>> +/*
>> + * 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_device_ctx *dev_ctx;
>> +	struct se_api_msg *rx_msg;
>> +	bool is_response = false;
>> +	struct se_if_priv *priv;
>> +	struct se_msg_hdr header;
>> +
>> +	priv = dev_get_drvdata(dev);
>> +	if (!priv) {
>> +		dev_err(dev, "SE-MU Priv data is NULL;");
>> +		return;
>> +	}
>> +
>> +	/* The function can be called with NULL msg */
>> +	if (!msg) {
>> +		dev_err(dev, "Message is invalid\n");
>> +		return;
>> +	}
>> +
>> +	header.tag = ((u8 *)msg)[TAG_OFFSET];
>> +	header.command = ((u8 *)msg)[CMD_OFFSET];
>> +	header.size = ((u8 *)msg)[SZ_OFFSET];
>> +	header.ver = ((u8 *)msg)[VER_OFFSET];
>> +
>> +	/* Incoming command: wake up the receiver if any. */
>> +	if (header.tag == priv->cmd_tag) {
>> +		dev_dbg(dev, "Selecting cmd receiver\n");
>> +		dev_ctx = priv->cmd_receiver_dev;
>> +	} else if (header.tag == priv->rsp_tag) {
>> +		if (priv->waiting_rsp_dev) {
>> +			dev_dbg(dev, "Selecting rsp waiter\n");
>> +			dev_ctx = priv->waiting_rsp_dev;
>> +			is_response = true;
>> +		} else {
>> +			/*
>> +			 * Reading the EdgeLock Enclave response
>> +			 * to the command, sent by other
>> +			 * linux kernel services.
>> +			 */
>> +			spin_lock(&priv->lock);
>> +			memcpy(&priv->rx_msg, msg, header.size << 2);
>> +
>> +			complete(&priv->done);
>> +			spin_unlock(&priv->lock);
>> +			return;
>> +		}
>> +	} else {
>> +		dev_err(dev, "Failed to select a device for message: %.8x\n",
>> +				*((u32 *) &header));
>> +		return;
>> +	}
>> +	/* Init reception */
>> +	rx_msg = kzalloc(header.size << 2, GFP_KERNEL);
>> +	if (rx_msg)
>> +		memcpy(rx_msg, msg, header.size << 2);
>> +
>> +	dev_ctx->temp_resp = (u32 *)rx_msg;
>> +	dev_ctx->temp_resp_size = header.size;
>> +
>> +	/* Allow user to read */
>> +	dev_ctx->pending_hdr = 1;
>> +	wake_up_interruptible(&dev_ctx->wq);
>> +
>> +	if (is_response)
>> +		priv->waiting_rsp_dev = NULL;
>> +}
>> +
>> +int validate_rsp_hdr(struct se_if_priv *priv, u32 header,
>> +		     uint8_t msg_id, uint8_t sz, bool is_base_api)
>> +{
>> +	int ret = -EINVAL;
>> +	u32 size;
>> +	u32 cmd;
>> +	u32 tag;
>> +	u32 ver;
>> +
>> +	tag = MSG_TAG(header);
>> +	cmd = MSG_COMMAND(header);
>> +	size = MSG_SIZE(header);
>> +	ver = MSG_VER(header);
>> +
>> +	do {
>> +		if (tag != priv->rsp_tag) {
>> +			dev_err(priv->dev,
>> +				"MSG[0x%x] Hdr: Resp tag mismatch. (0x%x != 0x%x)",
>> +				msg_id, tag, priv->rsp_tag);
>> +			break;
>> +		}
>> +
>> +		if (cmd != msg_id) {
>> +			dev_err(priv->dev,
>> +				"MSG Header: Cmd id mismatch. (0x%x != 0x%x)",
>> +				cmd, msg_id);
>> +			break;
>> +		}
>> +
>> +		if (size != (sz >> 2)) {
>> +			dev_err(priv->dev,
>> +				"MSG[0x%x] Hdr: Cmd size mismatch. (0x%x != 0x%x)",
>> +				msg_id, size, (sz >> 2));
>> +			break;
>> +		}
>> +
>> +		if (is_base_api && (ver != priv->base_api_ver)) {
>> +			dev_err(priv->dev,
>> +				"MSG[0x%x] Hdr: Base API Vers mismatch. (0x%x != 0x%x)",
>> +				msg_id, ver, priv->base_api_ver);
>> +			break;
>> +		} else if (!is_base_api && ver != priv->fw_api_ver) {
>> +			dev_err(priv->dev,
>> +				"MSG[0x%x] Hdr: FW API Vers mismatch. (0x%x != 0x%x)",
>> +				msg_id, ver, priv->fw_api_ver);
>> +			break;
>> +		}
>> +
>> +		ret = 0;
>> +
>> +	} while (false);
>> +
>> +	return ret;
>> +}
>> +
>> +int se_save_imem_state(struct device *dev)
>> +{
>> +	struct se_if_priv *priv = dev_get_drvdata(dev);
>> +	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(dev,
>> +			       priv->imem.phyaddr,
>> +			       ELE_IMEM_SIZE,
>> +			       ELE_IMEM_EXPORT);
>> +	if (ret < 0)
>> +		dev_err(dev, "Failed to export IMEM\n");
>> +	else
>> +		dev_info(dev,
>> +			"Exported %d bytes of encrypted IMEM\n",
>> +			ret);
>> +
>> +	return ret;
>> +}
>> +
>> +int se_restore_imem_state(struct device *dev)
>> +{
>> +	struct se_if_priv *priv = dev_get_drvdata(dev);
>> +	struct soc_info s_info;
>> +	int ret;
>> +
>> +	/* get info from ELE */
>> +	ret = ele_get_info(dev, &s_info);
>> +	if (ret) {
>> +		dev_err(dev, "Failed to get info from ELE.\n");
>> +		return ret;
>> +	}
>> +
>> +	/* Get IMEM state, if 0xFE then import IMEM */
>> +	if (s_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(dev,
>> +				       priv->imem.phyaddr,
>> +				       priv->imem.size,
>> +				       ELE_IMEM_IMPORT);
>> +		if (ret) {
>> +			dev_err(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(dev, &s_info);
>> +	if (ret) {
>> +		dev_err(dev, "Failed to get info from ELE.\n");
>> +		goto exit;
>> +	}
>> +
>> +	if (s_info.imem_state == ELE_IMEM_STATE_OK)
>> +		dev_info(dev, "Successfully restored IMEM\n");
>> +	else
>> +		dev_err(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..6e3a2114bb56
>> --- /dev/null
>> +++ b/drivers/firmware/imx/ele_common.h
>> @@ -0,0 +1,43 @@
>> +/* SPDX-License-Identifier: GPL-2.0+ */
>> +/*
>> + * Copyright 2024 NXP
>> + */
>> +
>> +
>> +#ifndef __ELE_COMMON_H__
>> +#define __ELE_COMMON_H__
>> +
>> +#include "se_ctrl.h"
>> +
>> +#define IMX_ELE_FW_DIR                 "imx/ele/"
>> +
>> +uint32_t plat_add_msg_crc(uint32_t *msg, uint32_t msg_len);
>> +int imx_ele_miscdev_msg_rcv(struct se_if_device_ctx *priv);
>> +int imx_ele_miscdev_msg_send(struct se_if_device_ctx *dev_ctx,
>> +			     void *tx_msg, int tx_msg_sz);
>> +int imx_ele_msg_rcv(struct se_if_priv *priv);
>> +int imx_ele_msg_send(struct se_if_priv *priv, void *mssg);
>> +int imx_ele_msg_send_rcv(struct se_if_priv *priv, void *mssg);
>> +void se_if_rx_callback(struct mbox_client *mbox_cl, void *msg);
>> +int validate_rsp_hdr(struct se_if_priv *priv, unsigned int header,
>> +		     u8 msg_id, u8 sz, bool is_base_api);
>> +
>> +/* Fill a command message header with a given command ID and length in bytes. */
>> +static inline int plat_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 device *dev);
>> +int se_restore_imem_state(struct device *dev);
>> +
>> +#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..11c5eaa7353f
>> --- /dev/null
>> +++ b/drivers/firmware/imx/se_ctrl.c
>> @@ -0,0 +1,1339 @@
>> +// 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 <uapi/linux/se_ioctl.h>
>> +
>> +#include "ele_base_msg.h"
>> +#include "ele_common.h"
>> +#include "se_ctrl.h"
>> +
>> +#define RESERVED_DMA_POOL		BIT(1)
>> +
>> +struct imx_se_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 *mbox_tx_name;
>> +	u8 *mbox_rx_name;
>> +	u8 *pool_name;
>> +	u8 *fw_name_in_rfs;
>> +	bool soc_register;
>> +	bool reserved_dma_ranges;
>> +	bool imem_mgmt;
>> +};
>> +
>> +struct imx_se_node_info_list {
>> +	u8 num_mu;
>> +	u16 soc_id;
>> +	u16 soc_rev;
>> +	struct imx_se_node_info info[];
>> +};
>> +
>> +static const struct imx_se_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 = 0xd6,
>> +				.base_api_ver = MESSAGING_VERSION_6,
>> +				.fw_api_ver = MESSAGING_VERSION_7,
>> +				.se_name = "hsm1",
>> +				.mbox_tx_name = "tx",
>> +				.mbox_rx_name = "rx",
>> +				.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,
>> +			},
>> +	},
>> +};
>> +
>> +static const struct imx_se_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 = 0xd6,
>> +				.base_api_ver = MESSAGING_VERSION_6,
>> +				.fw_api_ver = MESSAGING_VERSION_7,
>> +				.se_name = "hsm1",
>> +				.mbox_tx_name = "tx",
>> +				.mbox_rx_name = "rx",
>> +				.reserved_dma_ranges = true,
>> +				.imem_mgmt = true,
>> +				.soc_register = true,
>> +			},
>> +	},
>> +};
>> +
>> +static const struct of_device_id se_match[] = {
>> +	{ .compatible = "fsl,imx8ulp-ele", .data = (void *)&imx8ulp_info},
>> +	{ .compatible = "fsl,imx93-ele", .data = (void *)&imx93_info},
>> +	{},
>> +};
>> +
>> +static struct imx_se_node_info
>> +		*get_imx_se_node_info(struct imx_se_node_info_list *info_list,
>> +				      const u32 idx)
>> +{
>> +	if (idx < 0 || idx > info_list->num_mu)
>> +		return NULL;
>> +
>> +	return &info_list->info[idx];
>> +}
>> +
>> +void *get_phy_buf_mem_pool(struct device *dev,
>> +			   u8 *mem_pool_name,
>> +			   dma_addr_t *buf,
>> +			   u32 size)
>> +{
>> +	struct device_node *of_node = dev->of_node;
>> +	struct gen_pool *mem_pool;
>> +
>> +	mem_pool = of_gen_pool_get(of_node, mem_pool_name, 0);
>> +	if (!mem_pool) {
>> +		dev_err(dev,
>> +			"Unable to get sram pool = %s\n",
>> +			mem_pool_name);
>> +		return 0;
>> +	}
>> +
>> +	return gen_pool_dma_alloc(mem_pool, size, buf);
>> +}
>> +
>> +void free_phybuf_mem_pool(struct device *dev,
>> +			  u8 *mem_pool_name,
>> +			  u32 *buf,
>> +			  u32 size)
>> +{
>> +	struct device_node *of_node = dev->of_node;
>> +	struct gen_pool *mem_pool;
>> +
>> +	mem_pool = of_gen_pool_get(of_node, mem_pool_name, 0);
>> +	if (!mem_pool)
>> +		dev_err(dev,
>> +			"%s: Failed: Unable to get sram pool.\n",
>> +			__func__);
>> +
>> +	gen_pool_free(mem_pool, (u64)buf, size);
>> +}
>> +
>> +static int imx_fetch_soc_info(struct device *dev)
>> +{
>> +	struct se_if_priv *priv = dev_get_drvdata(dev);
>> +	struct imx_se_node_info_list *info_list;
>> +	const struct imx_se_node_info *info;
>> +	struct soc_device_attribute *attr;
>> +	struct soc_device *sdev;
>> +	struct soc_info s_info;
>> +	int err = 0;
>> +
>> +	info = priv->info;
>> +	info_list = (struct imx_se_node_info_list *)
>> +				device_get_match_data(dev->parent);
>> +	if (info_list->soc_rev)
>> +		return err;
>> +
>> +	err = ele_get_info(dev, &s_info);
>> +	if (err)
>> +		s_info.major_ver = DEFAULT_IMX_SOC_VER;
>> +
>> +	info_list->soc_rev = s_info.soc_rev;
>> +
>> +	if (!info->soc_register)
>> +		return 0;
>> +
>> +	attr = devm_kzalloc(dev, sizeof(*attr), GFP_KERNEL);
>> +	if (!attr)
>> +		return -ENOMEM;
>> +
>> +	if (s_info.minor_ver)
>> +		attr->revision = devm_kasprintf(dev, GFP_KERNEL, "%x.%x",
>> +					   s_info.major_ver,
>> +					   s_info.minor_ver);
>> +	else
>> +		attr->revision = devm_kasprintf(dev, GFP_KERNEL, "%x",
>> +					   s_info.major_ver);
>> +
>> +	switch (s_info.soc_id) {
>> +	case SOC_ID_OF_IMX8ULP:
>> +		attr->soc_id = devm_kasprintf(dev, GFP_KERNEL,
>> +					      "i.MX8ULP");
>> +		break;
>> +	case SOC_ID_OF_IMX93:
>> +		attr->soc_id = devm_kasprintf(dev, GFP_KERNEL,
>> +					      "i.MX93");
>> +		break;
>> +	}
>> +
>> +	err = of_property_read_string(of_root, "model",
>> +				      &attr->machine);
>> +	if (err) {
>> +		devm_kfree(dev, attr);
>> +		return -EINVAL;
>> +	}
>> +	attr->family = devm_kasprintf(dev, GFP_KERNEL, "Freescale i.MX");
>> +
>> +	attr->serial_number
>> +		= devm_kasprintf(dev, GFP_KERNEL, "%016llX", s_info.serial_num);
>> +
>> +	sdev = soc_device_register(attr);
>> +	if (IS_ERR(sdev)) {
>> +		devm_kfree(dev, attr->soc_id);
>> +		devm_kfree(dev, attr->serial_number);
>> +		devm_kfree(dev, attr->revision);
>> +		devm_kfree(dev, attr->family);
>> +		devm_kfree(dev, attr->machine);
>> +		devm_kfree(dev, attr);
>> +		return PTR_ERR(sdev);
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +/*
>> + * File operations for user-space
>> + */
>> +
>> +/* Write a message to the MU. */
>> +static ssize_t se_if_fops_write(struct file *fp, const char __user *buf,
>> +				size_t size, loff_t *ppos)
>> +{
>> +	struct se_api_msg *tx_msg __free(kfree);
>> +	struct se_if_device_ctx *dev_ctx;
>> +	struct se_if_priv *priv;
>> +	int err;
>> +
>> +	dev_ctx = container_of(fp->private_data,
>> +			       struct se_if_device_ctx,
>> +			       miscdev);
>> +	priv = dev_ctx->priv;
>> +	dev_dbg(priv->dev,
>> +		"%s: write from buf (%p)%zu, ppos=%lld\n",
>> +			dev_ctx->miscdev.name,
>> +			buf, size, ((ppos) ? *ppos : 0));
>> +
>> +	if (down_interruptible(&dev_ctx->fops_lock))
>> +		return -EBUSY;
>> +
>> +	if (dev_ctx->status != MU_OPENED) {
>> +		err = -EINVAL;
>> +		goto exit;
>> +	}
>> +
>> +	if (size < SE_MU_HDR_SZ) {
>> +		dev_err(priv->dev,
>> +			"%s: User buffer too small(%zu < %d)\n",
>> +				dev_ctx->miscdev.name,
>> +				size, SE_MU_HDR_SZ);
>> +		err = -ENOSPC;
>> +		goto exit;
>> +	}
>> +
>> +	tx_msg = memdup_user((void __user *)ppos, size);
>> +	if (!tx_msg) {
>> +		err = -ENOMEM;
>> +		goto exit;
>> +	}
>> +
>> +	/* Copy data to buffer */
>> +	if (copy_from_user(tx_msg, buf, size)) {
>> +		err = -EFAULT;
>> +		dev_err(priv->dev,
>> +			"%s: Fail copy message from user\n",
>> +				dev_ctx->miscdev.name);
>> +		goto exit;
>> +	}
>> +
>> +	print_hex_dump_debug("from user ", DUMP_PREFIX_OFFSET, 4, 4,
>> +			     tx_msg, size, false);
>> +
>> +	err = imx_ele_miscdev_msg_send(dev_ctx, tx_msg, size);
>> +
>> +exit:
>> +	up(&dev_ctx->fops_lock);
>> +	return err;
>> +}
>> +
>> +/*
>> + * Read a message from the MU.
>> + * Blocking until a message is available.
>> + */
>> +static ssize_t se_if_fops_read(struct file *fp, char __user *buf,
>> +			       size_t size, loff_t *ppos)
>> +{
>> +	struct se_if_device_ctx *dev_ctx;
>> +	struct se_buf_desc *b_desc;
>> +	struct se_if_priv *priv;
>> +	u32 size_to_copy;
>> +	int err;
>> +
>> +	dev_ctx = container_of(fp->private_data,
>> +			       struct se_if_device_ctx,
>> +			       miscdev);
>> +	priv = dev_ctx->priv;
>> +	dev_dbg(priv->dev,
>> +		"%s: read to buf %p(%zu), ppos=%lld\n",
>> +			dev_ctx->miscdev.name,
>> +			buf, size, ((ppos) ? *ppos : 0));
>> +
>> +	if (down_interruptible(&dev_ctx->fops_lock))
>> +		return -EBUSY;
>> +
>> +	if (dev_ctx->status != MU_OPENED) {
>> +		err = -EINVAL;
>> +		goto exit;
>> +	}
>> +
>> +	err = imx_ele_miscdev_msg_rcv(dev_ctx);
>> +	if (err)
>> +		goto exit;
>> +
>> +	/* Buffer containing the message from FW, is
>> +	 * allocated in callback function.
>> +	 * Check if buffer allocation failed.
>> +	 */
>> +	if (!dev_ctx->temp_resp) {
>> +		err = -ENOMEM;
>> +		goto exit;
>> +	}
>> +
>> +	dev_dbg(priv->dev,
>> +			"%s: %s %s\n",
>> +			dev_ctx->miscdev.name,
>> +			__func__,
>> +			"message received, start transmit to user");
>> +
>> +	/*
>> +	 * Check that the size passed as argument is larger than
>> +	 * the one carried in the message.
>> +	 */
>> +	size_to_copy = dev_ctx->temp_resp_size << 2;
>> +	if (size_to_copy > size) {
>> +		dev_dbg(priv->dev,
>> +			"%s: User buffer too small (%zu < %d)\n",
>> +				dev_ctx->miscdev.name,
>> +				size, size_to_copy);
>> +		size_to_copy = size;
>> +	}
>> +
>> +	/*
>> +	 * We may need to copy the output data to user before
>> +	 * delivering the completion message.
>> +	 */
>> +	while (!list_empty(&dev_ctx->pending_out)) {
>> +		b_desc = list_first_entry_or_null(&dev_ctx->pending_out,
>> +						  struct se_buf_desc,
>> +						  link);
>> +		if (!b_desc)
>> +			continue;
>> +
>> +		if (b_desc->usr_buf_ptr && b_desc->shared_buf_ptr) {
>> +
>> +			dev_dbg(priv->dev,
>> +				"%s: Copy output data to user\n",
>> +				dev_ctx->miscdev.name);
>> +			if (copy_to_user(b_desc->usr_buf_ptr,
>> +					 b_desc->shared_buf_ptr,
>> +					 b_desc->size)) {
>> +				dev_err(priv->dev,
>> +					"%s: Failure copying output data to user.",
>> +					dev_ctx->miscdev.name);
>> +				err = -EFAULT;
>> +				goto exit;
>> +			}
>> +		}
>> +
>> +		if (b_desc->shared_buf_ptr)
>> +			memset(b_desc->shared_buf_ptr, 0, b_desc->size);
>> +
>> +		__list_del_entry(&b_desc->link);
>> +		kfree(b_desc);
>> +	}
>> +
>> +	/* Copy data from the buffer */
>> +	print_hex_dump_debug("to user ", DUMP_PREFIX_OFFSET, 4, 4,
>> +			     dev_ctx->temp_resp, size_to_copy, false);
>> +	if (copy_to_user(buf, dev_ctx->temp_resp, size_to_copy)) {
>> +		dev_err(priv->dev,
>> +			"%s: Failed to copy to user\n",
>> +				dev_ctx->miscdev.name);
>> +		err = -EFAULT;
>> +		goto exit;
>> +	}
>> +
>> +	err = size_to_copy;
>> +	kfree(dev_ctx->temp_resp);
>> +
>> +	/* free memory allocated on the shared buffers. */
>> +	dev_ctx->secure_mem.pos = 0;
>> +	dev_ctx->non_secure_mem.pos = 0;
>> +
>> +	dev_ctx->pending_hdr = 0;
>> +
>> +exit:
>> +	/*
>> +	 * Clean the used Shared Memory space,
>> +	 * whether its Input Data copied from user buffers, or
>> +	 * Data received from FW.
>> +	 */
>> +	while (!list_empty(&dev_ctx->pending_in) ||
>> +	       !list_empty(&dev_ctx->pending_out)) {
>> +		if (!list_empty(&dev_ctx->pending_in))
>> +			b_desc = list_first_entry_or_null(&dev_ctx->pending_in,
>> +							  struct se_buf_desc,
>> +							  link);
>> +		else
>> +			b_desc = list_first_entry_or_null(&dev_ctx->pending_out,
>> +							  struct se_buf_desc,
>> +							  link);
>> +
>> +		if (!b_desc)
>> +			continue;
>> +
>> +		if (b_desc->shared_buf_ptr)
>> +			memset(b_desc->shared_buf_ptr, 0, b_desc->size);
>> +
>> +		__list_del_entry(&b_desc->link);
>> +		kfree(b_desc);
>> +	}
>> +
>> +	up(&dev_ctx->fops_lock);
>> +	return err;
>> +}
>> +
>> +/* Give access to EdgeLock Enclave, to the memory we want to share */
>> +static int se_if_setup_se_mem_access(struct se_if_device_ctx *dev_ctx,
>> +				     u64 addr, u32 len)
>> +{
>> +	/* Assuming EdgeLock Enclave has access to all the memory regions */
>> +	int ret = 0;
>> +
>> +	if (ret) {
>> +		dev_err(dev_ctx->priv->dev,
>> +			"%s: Fail find memreg\n", dev_ctx->miscdev.name);
>> +		goto exit;
>> +	}
>> +
>> +	if (ret) {
>> +		dev_err(dev_ctx->priv->dev,
>> +			"%s: Fail set permission for resource\n",
>> +				dev_ctx->miscdev.name);
>> +		goto exit;
>> +	}
>> +
>> +exit:
>> +	return ret;
>> +}
>> +
>> +static int se_ioctl_get_mu_info(struct se_if_device_ctx *dev_ctx,
>> +				u64 arg)
>> +{
>> +	struct se_if_priv *priv = dev_get_drvdata(dev_ctx->dev);
>> +	struct imx_se_node_info *if_node_info;
>> +	struct se_ioctl_get_if_info info;
>> +	int err = 0;
>> +
>> +	if_node_info = (struct imx_se_node_info *)priv->info;
>> +
>> +	info.se_if_id = if_node_info->se_if_id;
>> +	info.interrupt_idx = 0;
>> +	info.tz = 0;
>> +	info.did = if_node_info->se_if_did;
>> +	info.cmd_tag = if_node_info->cmd_tag;
>> +	info.rsp_tag = if_node_info->rsp_tag;
>> +	info.success_tag = if_node_info->success_tag;
>> +	info.base_api_ver = if_node_info->base_api_ver;
>> +	info.fw_api_ver = if_node_info->fw_api_ver;
>> +
>> +	dev_dbg(priv->dev,
>> +		"%s: info [se_if_id: %d, irq_idx: %d, tz: 0x%x, did: 0x%x]\n",
>> +			dev_ctx->miscdev.name,
>> +			info.se_if_id, info.interrupt_idx, info.tz, info.did);
>> +
>> +	if (copy_to_user((u8 *)arg, &info, sizeof(info))) {
>> +		dev_err(dev_ctx->priv->dev,
>> +			"%s: Failed to copy mu info to user\n",
>> +				dev_ctx->miscdev.name);
>> +		err = -EFAULT;
>> +		goto exit;
>> +	}
>> +
>> +exit:
>> +	return err;
>> +}
>> +
>> +/*
>> + * Copy a buffer of data to/from the user and return the address to use in
>> + * messages
>> + */
>> +static int se_ioctl_setup_iobuf_handler(struct se_if_device_ctx *dev_ctx,
>> +					    u64 arg)
>> +{
>> +	struct se_ioctl_setup_iobuf io = {0};
>> +	struct se_shared_mem *shared_mem;
>> +	struct se_buf_desc *b_desc;
>> +	int err = 0;
>> +	u32 pos;
>> +
>> +	if (copy_from_user(&io, (u8 *)arg, sizeof(io))) {
>> +		dev_err(dev_ctx->priv->dev,
>> +			"%s: Failed copy iobuf config from user\n",
>> +				dev_ctx->miscdev.name);
>> +		err = -EFAULT;
>> +		goto exit;
>> +	}
>> +
>> +	dev_dbg(dev_ctx->priv->dev,
>> +			"%s: io [buf: %p(%d) flag: %x]\n",
>> +			dev_ctx->miscdev.name,
>> +			io.user_buf, io.length, io.flags);
>> +
>> +	if (io.length == 0 || !io.user_buf) {
>> +		/*
>> +		 * Accept NULL pointers since some buffers are optional
>> +		 * in FW commands. In this case we should return 0 as
>> +		 * pointer to be embedded into the message.
>> +		 * Skip all data copy part of code below.
>> +		 */
>> +		io.ele_addr = 0;
>> +		goto copy;
>> +	}
>> +
>> +	/* Select the shared memory to be used for this buffer. */
>> +	if (io.flags & SE_MU_IO_FLAGS_USE_SEC_MEM) {
>> +		/* App requires to use secure memory for this buffer.*/
>> +		dev_err(dev_ctx->priv->dev,
>> +			"%s: Failed allocate SEC MEM memory\n",
>> +				dev_ctx->miscdev.name);
>> +		err = -EFAULT;
>> +		goto exit;
>> +	} else {
>> +		/* No specific requirement for this buffer. */
>> +		shared_mem = &dev_ctx->non_secure_mem;
>> +	}
>> +
>> +	/* Check there is enough space in the shared memory. */
>> +	if (shared_mem->size < shared_mem->pos
>> +			|| io.length >= shared_mem->size - shared_mem->pos) {
>> +		dev_err(dev_ctx->priv->dev,
>> +			"%s: Not enough space in shared memory\n",
>> +				dev_ctx->miscdev.name);
>> +		err = -ENOMEM;
>> +		goto exit;
>> +	}
>> +
>> +	/* Allocate space in shared memory. 8 bytes aligned. */
>> +	pos = shared_mem->pos;
>> +	shared_mem->pos += round_up(io.length, 8u);
>> +	io.ele_addr = (u64)shared_mem->dma_addr + pos;
>> +
>> +	if ((io.flags & SE_MU_IO_FLAGS_USE_SEC_MEM) &&
>> +	    !(io.flags & SE_MU_IO_FLAGS_USE_SHORT_ADDR)) {
>> +		/*Add base address to get full address.*/
>> +		dev_err(dev_ctx->priv->dev,
>> +			"%s: Failed allocate SEC MEM memory\n",
>> +				dev_ctx->miscdev.name);
>> +		err = -EFAULT;
>> +		goto exit;
>> +	}
>> +
>> +	memset(shared_mem->ptr + pos, 0, io.length);
>> +	if ((io.flags & SE_IO_BUF_FLAGS_IS_INPUT) ||
>> +	    (io.flags & SE_IO_BUF_FLAGS_IS_IN_OUT)) {
>> +		/*
>> +		 * buffer is input:
>> +		 * copy data from user space to this allocated buffer.
>> +		 */
>> +		if (copy_from_user(shared_mem->ptr + pos, io.user_buf,
>> +				   io.length)) {
>> +			dev_err(dev_ctx->priv->dev,
>> +				"%s: Failed copy data to shared memory\n",
>> +				dev_ctx->miscdev.name);
>> +			err = -EFAULT;
>> +			goto exit;
>> +		}
>> +	}
>> +
>> +	b_desc = kzalloc(sizeof(*b_desc), GFP_KERNEL);
>> +	if (!b_desc) {
>> +		err = -ENOMEM;
>> +		goto exit;
>> +	}
>> +
>> +copy:
>> +	/* Provide the EdgeLock Enclave address to user space only if success.*/
>> +	if (copy_to_user((u8 *)arg, &io, sizeof(io))) {
>> +		dev_err(dev_ctx->priv->dev,
>> +			"%s: Failed to copy iobuff setup to user\n",
>> +				dev_ctx->miscdev.name);
>> +		kfree(b_desc);
>> +		err = -EFAULT;
>> +		goto exit;
>> +	}
>> +
>> +	if (b_desc) {
>> +		b_desc->shared_buf_ptr = shared_mem->ptr + pos;
>> +		b_desc->usr_buf_ptr = io.user_buf;
>> +		b_desc->size = io.length;
>> +
>> +		if (io.flags & SE_IO_BUF_FLAGS_IS_INPUT) {
>> +			/*
>> +			 * buffer is input:
>> +			 * add an entry in the "pending input buffers" list so
>> +			 * that copied data can be cleaned from shared memory
>> +			 * later.
>> +			 */
>> +			list_add_tail(&b_desc->link, &dev_ctx->pending_in);
>> +		} else {
>> +			/*
>> +			 * buffer is output:
>> +			 * add an entry in the "pending out buffers" list so data
>> +			 * can be copied to user space when receiving Secure-Enclave
>> +			 * response.
>> +			 */
>> +			list_add_tail(&b_desc->link, &dev_ctx->pending_out);
>> +		}
>> +	}
>> +
>> +exit:
>> +	return err;
>> +}
>> +
>> +/* IOCTL to provide SoC information */
>> +static int se_ioctl_get_soc_info_handler(struct se_if_device_ctx *dev_ctx,
>> +					     u64 arg)
>> +{
>> +	struct imx_se_node_info_list *info_list;
>> +	struct se_ioctl_get_soc_info soc_info;
>> +	int err = -EINVAL;
>> +
>> +	info_list = (struct imx_se_node_info_list *)
>> +			device_get_match_data(dev_ctx->priv->dev->parent);
>> +	if (!info_list)
>> +		goto exit;
>> +
>> +	soc_info.soc_id = info_list->soc_id;
>> +	soc_info.soc_rev = info_list->soc_rev;
>> +
>> +	err = (int)copy_to_user((u8 *)arg, (u8 *)(&soc_info), sizeof(soc_info));
>> +	if (err) {
>> +		dev_err(dev_ctx->priv->dev,
>> +			"%s: Failed to copy soc info to user\n",
>> +			dev_ctx->miscdev.name);
>> +		err = -EFAULT;
>> +		goto exit;
>> +	}
>> +
>> +exit:
>> +	return err;
>> +}
>> +
>> +/* Open a character device. */
>> +static int se_if_fops_open(struct inode *nd, struct file *fp)
>> +{
>> +	struct se_if_device_ctx *dev_ctx = container_of(fp->private_data,
>> +							struct se_if_device_ctx,
>> +							miscdev);
>> +	int err;
>> +
>> +	/* Avoid race if opened at the same time */
>> +	if (down_trylock(&dev_ctx->fops_lock))
>> +		return -EBUSY;
>> +
>> +	/* Authorize only 1 instance. */
>> +	if (dev_ctx->status != MU_FREE) {
>> +		err = -EBUSY;
>> +		goto exit;
>> +	}
>> +
>> +	/*
>> +	 * Allocate some memory for data exchanges with S40x.
>> +	 * This will be used for data not requiring secure memory.
>> +	 */
>> +	dev_ctx->non_secure_mem.ptr = dmam_alloc_coherent(dev_ctx->dev,
>> +					MAX_DATA_SIZE_PER_USER,
>> +					&dev_ctx->non_secure_mem.dma_addr,
>> +					GFP_KERNEL);
>> +	if (!dev_ctx->non_secure_mem.ptr) {
>> +		err = -ENOMEM;
>> +		goto exit;
>> +	}
>> +
>> +	err = se_if_setup_se_mem_access(dev_ctx,
>> +					  dev_ctx->non_secure_mem.dma_addr,
>> +					  MAX_DATA_SIZE_PER_USER);
>> +	if (err) {
>> +		err = -EPERM;
>> +		dev_err(dev_ctx->priv->dev,
>> +			"%s: Failed to share access to shared memory\n",
>> +			   dev_ctx->miscdev.name);
>> +		goto free_coherent;
>> +	}
>> +
>> +	dev_ctx->non_secure_mem.size = MAX_DATA_SIZE_PER_USER;
>> +	dev_ctx->non_secure_mem.pos = 0;
>> +	dev_ctx->status = MU_OPENED;
>> +
>> +	dev_ctx->pending_hdr = 0;
>> +
>> +	goto exit;
>> +
>> +free_coherent:
>> +	dmam_free_coherent(dev_ctx->priv->dev, MAX_DATA_SIZE_PER_USER,
>> +			   dev_ctx->non_secure_mem.ptr,
>> +			   dev_ctx->non_secure_mem.dma_addr);
>> +
>> +exit:
>> +	up(&dev_ctx->fops_lock);
>> +	return err;
>> +}
>> +
>> +/* Close a character device. */
>> +static int se_if_fops_close(struct inode *nd, struct file *fp)
>> +{
>> +	struct se_if_device_ctx *dev_ctx = container_of(fp->private_data,
>> +							struct se_if_device_ctx,
>> +							miscdev);
>> +	struct se_if_priv *priv = dev_ctx->priv;
>> +	struct se_buf_desc *b_desc;
>> +
>> +	/* Avoid race if closed at the same time */
>> +	if (down_trylock(&dev_ctx->fops_lock))
>> +		return -EBUSY;
>> +
>> +	/* The device context has not been opened */
>> +	if (dev_ctx->status != MU_OPENED)
>> +		goto exit;
>> +
>> +	/* check if this device was registered as command receiver. */
>> +	if (priv->cmd_receiver_dev == dev_ctx)
>> +		priv->cmd_receiver_dev = NULL;
>> +
>> +	/* check if this device was registered as waiting response. */
>> +	if (priv->waiting_rsp_dev == dev_ctx) {
>> +		priv->waiting_rsp_dev = NULL;
>> +		mutex_unlock(&priv->se_if_cmd_lock);
>> +	}
>> +
>> +	/* Unmap secure memory shared buffer. */
>> +	if (dev_ctx->secure_mem.ptr)
>> +		devm_iounmap(dev_ctx->dev, dev_ctx->secure_mem.ptr);
>> +
>> +	dev_ctx->secure_mem.ptr = NULL;
>> +	dev_ctx->secure_mem.dma_addr = 0;
>> +	dev_ctx->secure_mem.size = 0;
>> +	dev_ctx->secure_mem.pos = 0;
>> +
>> +	/* Free non-secure shared buffer. */
>> +	dmam_free_coherent(dev_ctx->priv->dev, MAX_DATA_SIZE_PER_USER,
>> +			   dev_ctx->non_secure_mem.ptr,
>> +			   dev_ctx->non_secure_mem.dma_addr);
>> +
>> +	dev_ctx->non_secure_mem.ptr = NULL;
>> +	dev_ctx->non_secure_mem.dma_addr = 0;
>> +	dev_ctx->non_secure_mem.size = 0;
>> +	dev_ctx->non_secure_mem.pos = 0;
>> +
>> +	while (!list_empty(&dev_ctx->pending_in) ||
>> +	       !list_empty(&dev_ctx->pending_out)) {
>> +		if (!list_empty(&dev_ctx->pending_in))
>> +			b_desc = list_first_entry_or_null(&dev_ctx->pending_in,
>> +							  struct se_buf_desc,
>> +							  link);
>> +		else
>> +			b_desc = list_first_entry_or_null(&dev_ctx->pending_out,
>> +							  struct se_buf_desc,
>> +							  link);
>> +
>> +		if (!b_desc)
>> +			continue;
>> +
>> +		if (b_desc->shared_buf_ptr)
>> +			memset(b_desc->shared_buf_ptr, 0, b_desc->size);
>> +
>> +		__list_del_entry(&b_desc->link);
>> +		devm_kfree(dev_ctx->dev, b_desc);
>> +	}
>> +
>> +	dev_ctx->status = MU_FREE;
>> +
>> +exit:
>> +	up(&dev_ctx->fops_lock);
>> +	return 0;
>> +}
>> +
>> +/* IOCTL entry point of a character device */
>> +static long se_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
>> +//static long se_ioctl(struct file *fp, u32 cmd, u64 arg)
>> +{
>> +	struct se_if_device_ctx *dev_ctx = container_of(fp->private_data,
>> +							struct se_if_device_ctx,
>> +							miscdev);
>> +	struct se_if_priv *se_if_priv = dev_ctx->priv;
>> +	int err = -EINVAL;
>> +
>> +	/* Prevent race during change of device context */
>> +	if (down_interruptible(&dev_ctx->fops_lock))
>> +		return -EBUSY;
>> +
>> +	switch (cmd) {
>> +	case SE_IOCTL_ENABLE_CMD_RCV:
>> +		if (!se_if_priv->cmd_receiver_dev) {
>> +			se_if_priv->cmd_receiver_dev = dev_ctx;
>> +			err = 0;
>> +		}
>> +		break;
>> +	case SE_IOCTL_GET_MU_INFO:
>> +		err = se_ioctl_get_mu_info(dev_ctx, arg);
>> +		break;
>> +	case SE_IOCTL_SETUP_IOBUF:
>> +		err = se_ioctl_setup_iobuf_handler(dev_ctx, arg);
>> +		break;
>> +	case SE_IOCTL_GET_SOC_INFO:
>> +		err = se_ioctl_get_soc_info_handler(dev_ctx, arg);
>> +		break;
>> +
>> +	default:
>> +		err = -EINVAL;
>> +		dev_dbg(se_if_priv->dev,
>> +			"%s: IOCTL %.8x not supported\n",
>> +				dev_ctx->miscdev.name,
>> +				cmd);
>> +	}
>> +
>> +	up(&dev_ctx->fops_lock);
>> +	return (long)err;
>> +}
>> +
>> +/* Char driver setup */
>> +static const struct file_operations se_if_fops = {
>> +	.open		= se_if_fops_open,
>> +	.owner		= THIS_MODULE,
>> +	.release	= se_if_fops_close,
>> +	.unlocked_ioctl = se_ioctl,
>> +	.read		= se_if_fops_read,
>> +	.write		= se_if_fops_write,
>> +};
>> +
>> +/* interface for managed res to free a mailbox channel */
>> +static void if_mbox_free_channel(void *mbox_chan)
>> +{
>> +	mbox_free_channel(mbox_chan);
>> +}
>> +
>> +/* interface for managed res to unregister a character device */
>> +static void if_misc_deregister(void *miscdevice)
>> +{
>> +	misc_deregister(miscdevice);
>> +}
>> +
>> +static int se_if_request_channel(struct device *dev,
>> +				 struct mbox_chan **chan,
>> +				 struct mbox_client *cl,
>> +				 const u8 *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);
>> +		if (ret != -EPROBE_DEFER)
>> +			dev_err(dev,
>> +				"Failed to request chan %s ret %d\n", name,
>> +				ret);
>> +		goto exit;
>> +	}
>> +
>> +	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 int se_probe_if_cleanup(struct platform_device *pdev)
>> +{
>> +	struct device *dev = &pdev->dev;
>> +	struct se_if_priv *priv;
>> +	int ret = 0;
>> +	int i;
>> +
>> +	priv = dev_get_drvdata(dev);
>> +	if (!priv) {
>> +		ret = 0;
>> +		dev_dbg(dev, "SE-MU Priv data is NULL;");
>> +		return ret;
>> +	}
>> +
>> +	if (priv->tx_chan)
>> +		mbox_free_channel(priv->tx_chan);
>> +	if (priv->rx_chan)
>> +		mbox_free_channel(priv->rx_chan);
>> +
>> +	/* 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;
>> +	}
>> +
>> +	if (priv->ctxs) {
>> +		for (i = 0; i < priv->max_dev_ctx; i++) {
>> +			if (priv->ctxs[i]) {
>> +				devm_remove_action(dev,
>> +						   if_misc_deregister,
>> +						   &priv->ctxs[i]->miscdev);
>> +				misc_deregister(&priv->ctxs[i]->miscdev);
>> +				devm_kfree(dev, priv->ctxs[i]);
>> +			}
>> +		}
>> +		devm_kfree(dev, priv->ctxs);
>> +	}
>> +
>> +	if (priv->flags & RESERVED_DMA_POOL) {
>> +		of_reserved_mem_device_release(dev);
>> +		priv->flags &= (~RESERVED_DMA_POOL);
>> +	}
>> +
>> +	devm_kfree(dev, priv);
>> +	of_node_put(dev->of_node);
>> +	of_platform_device_destroy(dev, NULL);
>> +
>> +	return ret;
>> +}
>> +
>> +static int se_probe_cleanup(struct platform_device *pdev)
>> +{
>> +	struct device *dev = &pdev->dev;
>> +	struct device_node *if_dn;
>> +
>> +	/* Enumerate se-interface device nodes. */
>> +	for_each_child_of_node(dev->of_node, if_dn) {
>> +		struct platform_device *if_pdev
>> +					= of_find_device_by_node(if_dn);
>> +		if (se_probe_if_cleanup(if_pdev))
>> +			dev_err(dev,
>> +				"Failed to clean-up child node probe.\n");
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static int init_device_context(struct device *dev)
>> +{
>> +	const struct imx_se_node_info *info;
>> +	struct se_if_device_ctx *dev_ctx;
>> +	struct se_if_priv *priv;
>> +	u8 *devname;
>> +	int ret = 0;
>> +	int i;
>> +
>> +	priv = dev_get_drvdata(dev);
>> +
>> +	if (!priv) {
>> +		ret = -EINVAL;
>> +		dev_err(dev, "Invalid SE-MU Priv data");
>> +		return ret;
>> +	}
>> +	info = priv->info;
>> +
>> +	priv->ctxs = devm_kzalloc(dev, sizeof(dev_ctx) * priv->max_dev_ctx,
>> +				  GFP_KERNEL);
>> +
>> +	if (!priv->ctxs) {
>> +		ret = -ENOMEM;
>> +		return ret;
>> +	}
>> +
>> +	/* Create users */
>> +	for (i = 0; i < priv->max_dev_ctx; i++) {
>> +		dev_ctx = devm_kzalloc(dev, sizeof(*dev_ctx), GFP_KERNEL);
>> +		if (!dev_ctx) {
>> +			ret = -ENOMEM;
>> +			return ret;
>> +		}
>> +
>> +		dev_ctx->dev = dev;
>> +		dev_ctx->status = MU_FREE;
>> +		dev_ctx->priv = priv;
>> +
>> +		priv->ctxs[i] = dev_ctx;
>> +
>> +		/* Default value invalid for an header. */
>> +		init_waitqueue_head(&dev_ctx->wq);
>> +
>> +		INIT_LIST_HEAD(&dev_ctx->pending_out);
>> +		INIT_LIST_HEAD(&dev_ctx->pending_in);
>> +		sema_init(&dev_ctx->fops_lock, 1);
>> +
>> +		devname = devm_kasprintf(dev, GFP_KERNEL, "%s_ch%d",
>> +					 info->se_name, i);
>> +		if (!devname) {
>> +			ret = -ENOMEM;
>> +			return ret;
>> +		}
>> +
>> +		dev_ctx->miscdev.name = devname;
>> +		dev_ctx->miscdev.minor = MISC_DYNAMIC_MINOR;
>> +		dev_ctx->miscdev.fops = &se_if_fops;
>> +		dev_ctx->miscdev.parent = dev;
>> +		ret = misc_register(&dev_ctx->miscdev);
>> +		if (ret) {
>> +			dev_err(dev, "failed to register misc device %d\n",
>> +				ret);
>> +			return ret;
>> +		}
>> +
>> +		ret = devm_add_action(dev, if_misc_deregister,
>> +				      &dev_ctx->miscdev);
>> +		if (ret) {
>> +			dev_err(dev,
>> +				"failed[%d] to add action to the misc-dev\n",
>> +				ret);
>> +			return ret;
>> +		}
>> +	}
>> +
>> +	return ret;
>> +}
>> +
>> +static void se_load_firmware(const struct firmware *fw, void *context)
>> +{
>> +	struct se_if_priv *priv = (struct se_if_priv *) context;
>> +	const struct imx_se_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 = dmam_alloc_coherent(priv->dev, fw->size,
>> +					 &se_fw_phyaddr,
>> +					 GFP_KERNEL);
>> +	if (!se_fw_buf) {
>> +		dev_err(priv->dev, "Failed to alloc SE fw buffer memory\n");
>> +		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);
>> +
>> +exit:
>> +	dmam_free_coherent(priv->dev,
>> +			   fw->size,
>> +			   se_fw_buf,
>> +			   se_fw_phyaddr);
>> +
>> +	release_firmware(fw);
>> +}
>> +
>> +static int se_if_probe(struct platform_device *pdev)
>> +{
>> +	struct imx_se_node_info_list *info_list;
>> +	struct device *dev = &pdev->dev;
>> +	struct imx_se_node_info *info;
>> +	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 = (struct imx_se_node_info_list *)
>> +			device_get_match_data(dev->parent);
>> +	info = get_imx_se_node_info(info_list, idx);
>> +
>> +	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, info->mbox_tx_name);
>> +	if (ret) {
>> +		if (ret == -EPROBE_DEFER)
>> +			dev_err(dev, "Mailbox tx channel, is not ready.\n");
>> +		else
>> +			dev_err(dev, "Failed to request tx channel\n");
>> +
>> +		goto exit;
>> +	}
>> +
>> +	ret = se_if_request_channel(dev, &priv->rx_chan,
>> +			&priv->se_mb_cl, info->mbox_rx_name);
>> +	if (ret) {
>> +		if (ret == -EPROBE_DEFER)
>> +			dev_err(dev, "Mailbox rx channel, is not ready.\n");
>> +		else
>> +			dev_dbg(dev, "Failed to request rx channel\n");
>> +
>> +		goto exit;
>> +	}
>> +
>> +	priv->dev = dev;
>> +	priv->info = info;
>> +
>> +	/* Initialize the mutex. */
>> +	mutex_init(&priv->se_if_lock);
>> +	mutex_init(&priv->se_if_cmd_lock);
>> +
>> +	priv->cmd_receiver_dev = NULL;
>> +	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;
>> +	priv->mem_pool_name = info->pool_name;
>> +	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);
>> +			priv->flags &= (~RESERVED_DMA_POOL);
>> +			goto exit;
>> +		}
>> +		priv->flags |= RESERVED_DMA_POOL;
>> +	}
>> +
>> +	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 = imx_fetch_soc_info(dev);
>> +	if (ret) {
>> +		dev_err(dev,
>> +			"failed[%d] to fetch SoC Info\n", 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->max_dev_ctx) {
>> +		ret = init_device_context(dev);
>> +		if (ret) {
>> +			dev_err(dev,
>> +				"Failed[0x%x] to create device contexts.\n",
>> +				ret);
>> +			goto exit;
>> +		}
>> +	}
>> +
>> +	dev_info(dev, "i.MX secure-enclave: %s interface to firmware, configured.\n",
>> +		 info->se_name);
>> +	return devm_of_platform_populate(dev);
>> +
>> +exit:
>> +	/* if execution control reaches here, if probe fails.
>> +	 * hence doing the cleanup
>> +	 */
>> +	if (se_probe_if_cleanup(pdev))
>> +		dev_err(dev,
>> +			"Failed to clean-up the child node probe.\n");
>> +
>> +	return ret;
>> +}
>> +
>> +static int se_probe(struct platform_device *pdev)
>> +{
>> +	struct device_node *enum_dev_node;
>> +	struct device *dev = &pdev->dev;
>> +	int enum_count;
>> +	int ret;
>> +
>> +	enum_count = of_get_child_count(dev->of_node);
>> +	if (!enum_count) {
>> +		ret = -EINVAL;
>> +		dev_err(dev, "Zero Tx/Rx path MU nodes.\n");
>> +		return ret;
>> +	}
>> +
>> +	for_each_child_of_node(dev->of_node, enum_dev_node) {
>> +		struct platform_device *enum_plat_dev __maybe_unused;
>> +
>> +		if (!of_device_is_available(enum_dev_node))
>> +			continue;
>> +
>> +		enum_plat_dev = of_platform_device_create(enum_dev_node,
>> +							  NULL,
>> +							  dev);
>> +		if (!enum_plat_dev) {
>> +			ret = -EINVAL;
>> +			of_node_put(enum_dev_node);
>> +			dev_err(dev,
>> +				"Failed to create enumerated platform device.");
>> +			break;
>> +		}
>> +
>> +		ret = se_if_probe(enum_plat_dev);
>> +	}
>> +	return ret;
>> +}
>> +
>> +static int se_remove(struct platform_device *pdev)
>> +{
>> +	if (se_probe_cleanup(pdev))
>> +		dev_err(&pdev->dev,
>> +			"i.MX Secure Enclave is not cleanly un-probed.");
>> +
>> +	return 0;
>> +}
>> +
>> +static int se_suspend(struct device *dev)
>> +{
>> +	struct se_if_priv *priv = dev_get_drvdata(dev);
>> +	const struct imx_se_node_info *info
>> +					= priv->info;
>> +
>> +	if (info && info->imem_mgmt)
>> +		priv->imem.size = se_save_imem_state(dev);
>> +
>> +	return 0;
>> +}
>> +
>> +static int se_resume(struct device *dev)
>> +{
>> +	struct se_if_priv *priv = dev_get_drvdata(dev);
>> +	const struct imx_se_node_info *info
>> +					= priv->info;
>> +	int i;
>> +
>> +	for (i = 0; i < priv->max_dev_ctx; i++)
>> +		wake_up_interruptible(&priv->ctxs[i]->wq);
>> +
>> +	if (info && info->imem_mgmt)
>> +		se_restore_imem_state(dev);
>> +
>> +	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_probe,
>> +	.remove = se_remove,
>> +};
>> +MODULE_DEVICE_TABLE(of, se_match);
>> +
>> +module_platform_driver(se_driver);
>> +
>> +MODULE_AUTHOR("Pankaj Gupta <pankaj.gupta@nxp.com>");
>> +MODULE_DESCRIPTION("iMX Secure Enclave Driver.");
>> +MODULE_LICENSE("GPL");
>> diff --git a/drivers/firmware/imx/se_ctrl.h b/drivers/firmware/imx/se_ctrl.h
>> new file mode 100644
>> index 000000000000..76e1ce77c52f
>> --- /dev/null
>> +++ b/drivers/firmware/imx/se_ctrl.h
>> @@ -0,0 +1,151 @@
>> +/* 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 MSG_TAG(x)			(((x) & 0xff000000) >> 24)
>> +#define MSG_COMMAND(x)			(((x) & 0x00ff0000) >> 16)
>> +#define MSG_SIZE(x)			(((x) & 0x0000ff00) >> 8)
>> +#define MSG_VER(x)			((x) & 0x000000ff)
>> +#define RES_STATUS(x)			((x) & 0x000000ff)
>> +#define MAX_DATA_SIZE_PER_USER		(65 * 1024)
>> +#define S4_DEFAULT_MUAP_INDEX		(2)
>> +#define S4_MUAP_DEFAULT_MAX_USERS	(4)
>> +#define MESSAGING_VERSION_6		0x6
>> +#define MESSAGING_VERSION_7		0x7
>> +
>> +#define DEFAULT_MESSAGING_TAG_COMMAND           (0x17u)
>> +#define DEFAULT_MESSAGING_TAG_RESPONSE          (0xe1u)
>> +
>> +#define SE_MU_IO_FLAGS_USE_SEC_MEM	(0x02u)
>> +#define SE_MU_IO_FLAGS_USE_SHORT_ADDR	(0x04u)
>> +
>> +struct se_imem_buf {
>> +	u8 *buf;
>> +	phys_addr_t phyaddr;
>> +	u32 size;
>> +};
>> +
>> +struct se_buf_desc {
>> +	u8 *shared_buf_ptr;
>> +	u8 *usr_buf_ptr;
>> +	u32 size;
>> +	struct list_head link;
>> +};
>> +
>> +/* Status of a char device */
>> +enum se_if_dev_ctx_status_t {
>> +	MU_FREE,
>> +	MU_OPENED
>> +};
>> +
>> +struct se_shared_mem {
>> +	dma_addr_t dma_addr;
>> +	u32 size;
>> +	u32 pos;
>> +	u8 *ptr;
>> +};
>> +
>> +/* Private struct for each char device instance. */
>> +struct se_if_device_ctx {
>> +	struct device *dev;
>> +	struct se_if_priv *priv;
>> +	struct miscdevice miscdev;
>> +
>> +	enum se_if_dev_ctx_status_t status;
>> +	wait_queue_head_t wq;
>> +	struct semaphore fops_lock;
>> +
>> +	u32 pending_hdr;
>> +	struct list_head pending_in;
>> +	struct list_head pending_out;
>> +
>> +	struct se_shared_mem secure_mem;
>> +	struct se_shared_mem non_secure_mem;
>> +
>> +	u32 *temp_resp;
>> +	u32 temp_resp_size;
>> +	struct notifier_block se_notify;
>> +};
>> +
>> +/* 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
>> +#define TAG_OFFSET	(SE_MU_HDR_SZ - 1)
>> +#define CMD_OFFSET	(SE_MU_HDR_SZ - 2)
>> +#define SZ_OFFSET	(SE_MU_HDR_SZ - 3)
>> +#define VER_OFFSET	(SE_MU_HDR_SZ - 4)
>> +
>> +struct se_api_msg {
>> +	u32 header; /* u8 Tag; u8 Command; u8 Size; u8 Ver; */
>> +	u32 *data;
>> +};
>> +
>> +struct se_if_priv {
>> +	struct se_if_device_ctx *cmd_receiver_dev;
>> +	struct se_if_device_ctx *waiting_rsp_dev;
>> +	bool no_dev_ctx_used;
>> +	/*
>> +	 * 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;
>> +	u8 *mem_pool_name;
>> +	u8 cmd_tag;
>> +	u8 rsp_tag;
>> +	u8 success_tag;
>> +	u8 base_api_ver;
>> +	u8 fw_api_ver;
>> +	u32 fw_fail;
>> +	const void *info;
>> +
>> +	struct mbox_client se_mb_cl;
>> +	struct mbox_chan *tx_chan, *rx_chan;
>> +	struct se_api_msg *rx_msg;
>> +	struct completion done;
>> +	spinlock_t lock;
>> +	/*
>> +	 * Flag to retain the state of initialization done at
>> +	 * the time of se-mu probe.
>> +	 */
>> +	uint32_t flags;
>> +	u8 max_dev_ctx;
>> +	struct se_if_device_ctx **ctxs;
>> +	struct se_imem_buf imem;
>> +};
>> +
>> +void *get_phy_buf_mem_pool(struct device *dev,
>> +			   u8 *mem_pool_name,
>> +			   dma_addr_t *buf,
>> +			   u32 size);
>> +phys_addr_t get_phy_buf_mem_pool1(struct device *dev,
>> +				 u8 *mem_pool_name,
>> +				 u32 **buf,
>> +				 u32 size);
>> +void free_phybuf_mem_pool(struct device *dev,
>> +			  u8 *mem_pool_name,
>> +			  u32 *buf,
>> +			  u32 size);
>> +#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__ */
>> diff --git a/include/uapi/linux/se_ioctl.h b/include/uapi/linux/se_ioctl.h
>> new file mode 100644
>> index 000000000000..f68a36e9da2c
>> --- /dev/null
>> +++ b/include/uapi/linux/se_ioctl.h
>> @@ -0,0 +1,88 @@
>> +/* SPDX-License-Identifier: (GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause*/
>> +/*
>> + * Copyright 2024 NXP
>> + */
>> +
>> +#ifndef SE_IOCTL_H
>> +#define SE_IOCTL_H
>> +
>> +/* IOCTL definitions. */
>> +
>> +struct se_ioctl_setup_iobuf {
>> +	u8 *user_buf;
>> +	u32 length;
>> +	u32 flags;
>> +	u64 ele_addr;
>> +};
>> +
>> +struct se_ioctl_shared_mem_cfg {
>> +	u32 base_offset;
>> +	u32 size;
>> +};
>> +
>> +struct se_ioctl_get_if_info {
>> +	u8 se_if_id;
>> +	u8 interrupt_idx;
>> +	u8 tz;
>> +	u8 did;
>> +	u8 cmd_tag;
>> +	u8 rsp_tag;
>> +	u8 success_tag;
>> +	u8 base_api_ver;
>> +	u8 fw_api_ver;
>> +};
>> +
>> +struct se_ioctl_signed_message {
>> +	u8 *message;
>> +	u32 msg_size;
>> +	u32 error_code;
>> +};
>> +
>> +struct se_ioctl_get_soc_info {
>> +	u16 soc_id;
>> +	u16 soc_rev;
>> +};
>> +
>> +/* IO Buffer Flags */
>> +#define SE_IO_BUF_FLAGS_IS_OUTPUT	(0x00u)
>> +#define SE_IO_BUF_FLAGS_IS_INPUT	(0x01u)
>> +#define SE_IO_BUF_FLAGS_USE_SEC_MEM	(0x02u)
>> +#define SE_IO_BUF_FLAGS_USE_SHORT_ADDR	(0x04u)
>> +#define SE_IO_BUF_FLAGS_IS_IN_OUT	(0x10u)
>> +
>> +/* IOCTLS */
>> +#define SE_IOCTL			0x0A /* like MISC_MAJOR. */
>> +
>> +/*
>> + * ioctl to designated the current fd as logical-reciever.
>> + * This is ioctl is send when the nvm-daemon, a slave to the
>> + * firmware is started by the user.
>> + */
>> +#define SE_IOCTL_ENABLE_CMD_RCV	_IO(SE_IOCTL, 0x01)
>> +
>> +/*
>> + * ioctl to get the buffer allocated from the memory, which is shared
>> + * between kernel and FW.
>> + * Post allocation, the kernel tagged the allocated memory with:
>> + *  Output
>> + *  Input
>> + *  Input-Output
>> + *  Short address
>> + *  Secure-memory
>> + */
>> +#define SE_IOCTL_SETUP_IOBUF	_IOWR(SE_IOCTL, 0x03, \
>> +					struct se_ioctl_setup_iobuf)
>> +
>> +/*
>> + * ioctl to get the mu information, that is used to exchange message
>> + * with FW, from user-spaced.
>> + */
>> +#define SE_IOCTL_GET_MU_INFO	_IOR(SE_IOCTL, 0x04, \
>> +					struct se_ioctl_get_if_info)
>> +/*
>> + * ioctl to get SoC Info from user-space.
>> + */
>> +#define SE_IOCTL_GET_SOC_INFO      _IOR(SE_IOCTL, 0x06, \
>> +					struct se_ioctl_get_soc_info)
>> +
>> +#endif
>>
>> -- 
>> 2.34.1
>>
> 
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