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

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> -----Original Message-----
> From: Amit Singh Tomar <amitsinght@xxxxxxxxxxx>
> Sent: Thursday, May 16, 2024 10:18 AM
> To: Pankaj Gupta <pankaj.gupta@xxxxxxx>; Jonathan Corbet
> <corbet@xxxxxxx>; Rob Herring <robh+dt@xxxxxxxxxx>; Krzysztof Kozlowski
> <krzysztof.kozlowski+dt@xxxxxxxxxx>; Conor Dooley <conor+dt@xxxxxxxxxx>;
> Shawn Guo <shawnguo@xxxxxxxxxx>; Sascha Hauer
> <s.hauer@xxxxxxxxxxxxxx>; Pengutronix Kernel Team
> <kernel@xxxxxxxxxxxxxx>; Fabio Estevam <festevam@xxxxxxxxx>
> Cc: linux-doc@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
> devicetree@xxxxxxxxxxxxxxx; imx@xxxxxxxxxxxxxxx; linux-arm-
> kernel@xxxxxxxxxxxxxxxxxxx
> Subject: [EXT] [PATCH 4/4] 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
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> 
> 
> > ----------------------------------------------------------------------
> > 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://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Furldefe
> nse.proofpoint.com%2Fv2%2Furl%3Fu%3Dhttps-3A__github.com_nxp-
> 2Dimx_imx-2Dsecure-
> 2Denclave.git%26d%3DDwICAg%26c%3DnKjWec2b6R0mOyPaz7xtfQ%26r%3
> DV_GK7jRuCHDErm6txmgDK1-MbUihtnSQ3gPgB-A-
> JKU%26m%3DlRJFNDYT5J3dZTYPCtbQrN6ho5BaZc62rCnOKShFGK0aosnXA0JK
> Gr_OrCPlpaat%26s%3DGFFpXM8z8-
> pliprvP1Xs1NsiJ8yEvE9xFQuUIGLYoe8%26e%3D&data=05%7C02%7Cpankaj.g
> upta%40nxp.com%7C416c8e43e7a2481741e008dc75636b25%7C686ea1d3b
> c2b4c6fa92cd99c5c301635%7C0%7C0%7C638514317087244086%7CUnkno
> wn%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1h
> aWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=5j5163PSPSKmQo%2BkFfD
> Rio%2Fleez0beSeLcppLrStC0Q%3D&reserved=0 ,
> > - i.MX Secure Middle-Ware:
> >    -- URL:
> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Furldefe
> nse.proofpoint.com%2Fv2%2Furl%3Fu%3Dhttps-3A__github.com_nxp-
> 2Dimx_imx-
> 2Dsmw.git%26d%3DDwICAg%26c%3DnKjWec2b6R0mOyPaz7xtfQ%26r%3DV
> _GK7jRuCHDErm6txmgDK1-MbUihtnSQ3gPgB-A-
> JKU%26m%3DlRJFNDYT5J3dZTYPCtbQrN6ho5BaZc62rCnOKShFGK0aosnXA0JK
> Gr_OrCPlpaat%26s%3DaCsO_lLG71KPvjVgXlx9Ly0Ed05XnSUJ4z-
> xxqxSze8%26e%3D&data=05%7C02%7Cpankaj.gupta%40nxp.com%7C416c8e
> 43e7a2481741e008dc75636b25%7C686ea1d3bc2b4c6fa92cd99c5c301635%
> 7C0%7C0%7C638514317087252827%7CUnknown%7CTWFpbGZsb3d8eyJWIj
> oiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0
> %7C%7C%7C&sdata=u6WyD94p8RRYMBUy6gsv0flZTTnz8LCkc0XbTU6FTt8%
> 3D&reserved=0
> >
> > Signed-off-by: Pankaj Gupta <pankaj.gupta@xxxxxxx>
> > ---
> >   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@xxxxxxx, pankaj.gupta@xxxxxxx
> > +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://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Furldefe
> nse.proofpoint.com%2Fv2%2Furl%3Fu%3Dhttps-3A__github.com_nxp-
> 2Dimx_imx-2Dsecure-
> 2Denclave.git%26d%3DDwICAg%26c%3DnKjWec2b6R0mOyPaz7xtfQ%26r%3
> DV_GK7jRuCHDErm6txmgDK1-MbUihtnSQ3gPgB-A-
> JKU%26m%3DlRJFNDYT5J3dZTYPCtbQrN6ho5BaZc62rCnOKShFGK0aosnXA0JK
> Gr_OrCPlpaat%26s%3DGFFpXM8z8-
> pliprvP1Xs1NsiJ8yEvE9xFQuUIGLYoe8%26e%3D&data=05%7C02%7Cpankaj.g
> upta%40nxp.com%7C416c8e43e7a2481741e008dc75636b25%7C686ea1d3b
> c2b4c6fa92cd99c5c301635%7C0%7C0%7C638514317087258839%7CUnkno
> wn%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1h
> aWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=Ca5NSJ0QWvGQHdJ3xvtg
> BQKOY1Whgs0HqonsnCdZuQ4%3D&reserved=0 ,
> > +
> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Furldefe
> nse.proofpoint.com%2Fv2%2Furl%3Fu%3Dhttps-3A__github.com_nxp-
> 2Dimx_imx-
> 2Dsmw.git%26d%3DDwICAg%26c%3DnKjWec2b6R0mOyPaz7xtfQ%26r%3DV
> _GK7jRuCHDErm6txmgDK1-MbUihtnSQ3gPgB-A-
> JKU%26m%3DlRJFNDYT5J3dZTYPCtbQrN6ho5BaZc62rCnOKShFGK0aosnXA0JK
> Gr_OrCPlpaat%26s%3DaCsO_lLG71KPvjVgXlx9Ly0Ed05XnSUJ4z-
> xxqxSze8%26e%3D&data=05%7C02%7Cpankaj.gupta%40nxp.com%7C416c8e
> 43e7a2481741e008dc75636b25%7C686ea1d3bc2b4c6fa92cd99c5c301635%
> 7C0%7C0%7C638514317087264038%7CUnknown%7CTWFpbGZsb3d8eyJWIj
> oiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0
> %7C%7C%7C&sdata=UGEFyRkAnlyWjATv3w6r%2Fy%2B1CXL2fGDMBk3jCL%2
> F%2BGNg%3D&reserved=0
> > +             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;
> > +     }
> > +
> > +     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);
> > +     u32 status;
> > +     int ret;
> > +
> > +     tx_msg = kzalloc(ELE_PING_REQ_SZ << 2, GFP_KERNEL);
> > +     if (!tx_msg) {
> > +             ret = -ENOMEM;
> > +             return ret;
> > +     }
> > +
> > +     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;
> 
> It looks odd, you can simply return 0 in the following statement.
Accepted. Already corrected for v2.

> 
> > +
> > +     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@xxxxxxx>");
> > +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
> >






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