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Message-ID:
<AM9PR04MB8604EB0491C86819173A0AC995E22@AM9PR04MB8604.eurprd04.prod.outlook.com>
Date: Mon, 13 May 2024 09:12:45 +0000
From: Pankaj Gupta <pankaj.gupta@....com>
To: Frank Li <frank.li@....com>
CC: Jonathan Corbet <corbet@....net>, Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley
<conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>, Sascha Hauer
<s.hauer@...gutronix.de>, Pengutronix Kernel Team <kernel@...gutronix.de>,
Fabio Estevam <festevam@...il.com>, "linux-doc@...r.kernel.org"
<linux-doc@...r.kernel.org>, "linux-kernel@...r.kernel.org"
<linux-kernel@...r.kernel.org>, "devicetree@...r.kernel.org"
<devicetree@...r.kernel.org>, "imx@...ts.linux.dev" <imx@...ts.linux.dev>,
"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH 4/4] firmware: imx: add driver for NXP EdgeLock Enclave
> -----Original Message-----
> From: Frank Li <frank.li@....com>
> Sent: Friday, May 10, 2024 10:11 PM
> To: Pankaj Gupta <pankaj.gupta@....com>
> Cc: Jonathan Corbet <corbet@....net>; Rob Herring <robh+dt@...nel.org>;
> Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>; Conor Dooley
> <conor+dt@...nel.org>; Shawn Guo <shawnguo@...nel.org>; Sascha Hauer
> <s.hauer@...gutronix.de>; Pengutronix Kernel Team
> <kernel@...gutronix.de>; Fabio Estevam <festevam@...il.com>; linux-
> doc@...r.kernel.org; linux-kernel@...r.kernel.org;
> devicetree@...r.kernel.org; imx@...ts.linux.dev; linux-arm-
> kernel@...ts.infradead.org
> Subject: Re: [PATCH 4/4] firmware: imx: add driver for NXP EdgeLock Enclave
>
> On Fri, May 10, 2024 at 06:57:30PM +0530, Pankaj Gupta wrote:
> > NXP hardware IP(s) for secure-enclaves like Edgelock Enclave(ELE),
> > are embedded in the SoC to support the features like HSM, SHE & V2X,
> > using message based communication interface.
> >
> > The secure enclave FW communicates on a dedicated messaging unit(MU)
> > based interface(s) with application core, where kernel is running.
> > It exists on specific i.MX processors. e.g. i.MX8ULP, i.MX93.
> >
> > This patch adds the driver for communication interface to secure-enclave,
> > for exchanging messages with NXP secure enclave HW IP(s) like EdgeLock
> Enclave,
> > both from:
> > - User-Space Applications via character driver.
> > - Kernel-space, used by kernel management layers like DM-Crypt.
> >
> > ABI documentation for the NXP secure-enclave driver.
> >
> > User-space library using this driver:
> > - i.MX Secure Enclave library:
> > -- URL: https://github.com/nxp-imx/imx-secure-enclave.git,
> > - i.MX Secure Middle-Ware:
> > -- URL: https://github.com/nxp-imx/imx-smw.git
> >
> > Signed-off-by: Pankaj Gupta <pankaj.gupta@....com>
> > ---
> > Documentation/ABI/testing/se-cdev | 42 ++
> > drivers/firmware/imx/Kconfig | 12 +
> > drivers/firmware/imx/Makefile | 2 +
> > drivers/firmware/imx/ele_base_msg.c | 287 ++++++++
> > drivers/firmware/imx/ele_base_msg.h | 70 ++
> > drivers/firmware/imx/ele_common.c | 341 +++++++++
> > drivers/firmware/imx/ele_common.h | 43 ++
> > drivers/firmware/imx/se_ctrl.c | 1339
> +++++++++++++++++++++++++++++++++++
> > drivers/firmware/imx/se_ctrl.h | 151 ++++
> > include/linux/firmware/imx/se_api.h | 14 +
> > include/uapi/linux/se_ioctl.h | 88 +++
> > 11 files changed, 2389 insertions(+)
> >
> > diff --git a/Documentation/ABI/testing/se-cdev
> b/Documentation/ABI/testing/se-cdev
> > new file mode 100644
> > index 000000000000..699525af6b86
> > --- /dev/null
> > +++ b/Documentation/ABI/testing/se-cdev
> > @@ -0,0 +1,42 @@
> > +What: /dev/<se>_mu[0-9]+_ch[0-9]+
> > +Date: May 2024
> > +KernelVersion: 6.8
> > +Contact: linux-imx@....com, pankaj.gupta@....com
> > +Description:
> > + NXP offers multiple hardware IP(s) for secure-enclaves like
> EdgeLock-
> > + Enclave(ELE), SECO. The character device file-descriptors
> > + /dev/<se>_mu*_ch* are the interface between user-space
> NXP's secure-
> > + enclave shared-library and the kernel driver.
> > +
> > + The ioctl(2)-based ABI is defined and documented in
> > + [include]<linux/firmware/imx/ele_mu_ioctl.h>
> > + ioctl(s) are used primarily for:
> > + - shared memory management
> > + - allocation of I/O buffers
> > + - get mu info
> > + - setting a dev-ctx as receiver that is slave to fw
> > + - get SoC info
> > +
> > + The following file operations are supported:
> > +
> > + open(2)
> > + Currently the only useful flags are O_RDWR.
> > +
> > + read(2)
> > + Every read() from the opened character device context is
> waiting on
> > + wakeup_intruptible, that gets set by the registered mailbox
> callback
> > + function; indicating a message received from the firmware
> on message-
> > + unit.
> > +
> > + write(2)
> > + Every write() to the opened character device context needs
> to acquire
> > + mailbox_lock, before sending message on to the message
> unit.
> > +
> > + close(2)
> > + Stops and free up the I/O contexts that was associated
> > + with the file descriptor.
> > +
> > +Users: https://github.com/nxp-imx/imx-secure-enclave.git,
> > + https://github.com/nxp-imx/imx-smw.git
> > + 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);
>
> If you want __free(kfree) it should be
>
> struct se_api_msg *tx_msg __free(kfree) = NULL;
> struct se_api_msg *rx_msg __free(kfree) = NULL;
>
> Or
Accepted.
>
> struct se_api_msg *tx_msg __free(kfree) = kzalloc(ELE_PING_REQ_SZ << 2,
> GFP_KERNEL)
> struct se_api_msg *rx_msg __free(kfree) = kzalloc(ELE_PING_RSP_SZ << 2,
> GFP_KERNEL)
>
> otherwise when
> if (!tx_msg) {
> return ret;
>
> ^^ when go here, rx_msg is random value. So kfree(rx_msg) will
> access random address.
Understood.
>
> }
>
> > + u32 status;
> > + int ret;
> > +
> > + tx_msg = kzalloc(ELE_PING_REQ_SZ << 2, GFP_KERNEL);
> > + if (!tx_msg) {
> > + ret = -ENOMEM;
> > + return ret;
>
>
> return -ENOMEM
>
> Frank
Accepted.
>
> > + }
> > +
> > + rx_msg = kzalloc(ELE_PING_RSP_SZ << 2, GFP_KERNEL);
> > + if (!rx_msg) {
> > + ret = -ENOMEM;
> > + return ret;
> > + }
> > +
> > + ret = plat_fill_cmd_msg_hdr(priv,
> > + (struct se_msg_hdr *)&tx_msg->header,
> > + ELE_PING_REQ, ELE_PING_REQ_SZ,
> > + true);
> > + if (ret) {
> > + dev_err(dev, "Error: plat_fill_cmd_msg_hdr failed.\n");
> > + goto exit;
> > + }
> > +
> > + priv->rx_msg = rx_msg;
> > + ret = imx_ele_msg_send_rcv(priv, tx_msg);
> > + if (ret)
> > + goto exit;
> > +
> > + ret = validate_rsp_hdr(priv,
> > + priv->rx_msg->header,
> > + ELE_PING_REQ,
> > + ELE_PING_RSP_SZ,
> > + true);
> > + if (ret)
> > + goto exit;
> > +
> > + status = RES_STATUS(priv->rx_msg->data[0]);
> > + if (status != priv->success_tag) {
> > + dev_err(dev, "Command Id[%d], Response Failure = 0x%x",
> > + ELE_PING_REQ, status);
> > + ret = -1;
> > + }
> > +exit:
> > + return ret;
> > +}
> > +
> > +int ele_service_swap(struct device *dev,
> > + phys_addr_t addr,
> > + u32 addr_size, u16 flag)
> > +{
> > + struct se_if_priv *priv = dev_get_drvdata(dev);
> > + struct se_api_msg *tx_msg __free(kfree);
> > + struct se_api_msg *rx_msg __free(kfree);
> > + u32 status;
> > + int ret;
> > +
> > + tx_msg = kzalloc(ELE_SERVICE_SWAP_REQ_MSG_SZ << 2,
> GFP_KERNEL);
> > + if (!tx_msg) {
> > + ret = -ENOMEM;
> > + return ret;
> > + }
> > +
> > + rx_msg = kzalloc(ELE_SERVICE_SWAP_RSP_MSG_SZ << 2,
> GFP_KERNEL);
> > + if (!rx_msg) {
> > + ret = -ENOMEM;
> > + return ret;
> > + }
> > +
> > + ret = plat_fill_cmd_msg_hdr(priv,
> > + (struct se_msg_hdr *)&tx_msg->header,
> > + ELE_SERVICE_SWAP_REQ,
> > + ELE_SERVICE_SWAP_REQ_MSG_SZ,
> > + true);
> > + if (ret)
> > + goto exit;
> > +
> > + tx_msg->data[0] = flag;
> > + tx_msg->data[1] = addr_size;
> > + tx_msg->data[2] = ELE_NONE_VAL;
> > + tx_msg->data[3] = lower_32_bits(addr);
> > + tx_msg->data[4] = plat_add_msg_crc((uint32_t *)&tx_msg[0],
> > +
> ELE_SERVICE_SWAP_REQ_MSG_SZ);
> > + priv->rx_msg = rx_msg;
> > + ret = imx_ele_msg_send_rcv(priv, tx_msg);
> > + if (ret < 0)
> > + goto exit;
> > +
> > + ret = validate_rsp_hdr(priv,
> > + priv->rx_msg->header,
> > + ELE_SERVICE_SWAP_REQ,
> > + ELE_SERVICE_SWAP_RSP_MSG_SZ,
> > + true);
> > + if (ret)
> > + goto exit;
> > +
> > + status = RES_STATUS(priv->rx_msg->data[0]);
> > + if (status != priv->success_tag) {
> > + dev_err(dev, "Command Id[%d], Response Failure = 0x%x",
> > + ELE_SERVICE_SWAP_REQ, status);
> > + ret = -1;
> > + } else {
> > + if (flag == ELE_IMEM_EXPORT)
> > + ret = priv->rx_msg->data[1];
> > + else
> > + ret = 0;
> > + }
> > +exit:
> > +
> > + return ret;
> > +}
> > +
> > +int ele_fw_authenticate(struct device *dev, phys_addr_t addr)
> > +{
> > + struct se_if_priv *priv = dev_get_drvdata(dev);
> > + struct se_api_msg *tx_msg __free(kfree);
> > + struct se_api_msg *rx_msg __free(kfree);
> > + u32 status;
> > + int ret;
> > +
> > + tx_msg = kzalloc(ELE_FW_AUTH_REQ_SZ << 2, GFP_KERNEL);
> > + if (!tx_msg) {
> > + ret = -ENOMEM;
> > + return ret;
> > + }
> > +
> > + rx_msg = kzalloc(ELE_FW_AUTH_RSP_MSG_SZ << 2, GFP_KERNEL);
> > + if (!rx_msg) {
> > + ret = -ENOMEM;
> > + return ret;
> > + }
> > + ret = plat_fill_cmd_msg_hdr(priv,
> > + (struct se_msg_hdr *)&tx_msg->header,
> > + ELE_FW_AUTH_REQ,
> > + ELE_FW_AUTH_REQ_SZ,
> > + true);
> > + if (ret)
> > + goto exit;
> > +
> > + tx_msg->data[0] = addr;
> > + tx_msg->data[1] = 0x0;
> > + tx_msg->data[2] = addr;
> > +
> > + priv->rx_msg = rx_msg;
> > + ret = imx_ele_msg_send_rcv(priv, tx_msg);
> > + if (ret < 0)
> > + goto exit;
> > +
> > + ret = validate_rsp_hdr(priv,
> > + priv->rx_msg->header,
> > + ELE_FW_AUTH_REQ,
> > + ELE_FW_AUTH_RSP_MSG_SZ,
> > + true);
> > + if (ret)
> > + goto exit;
> > +
> > + status = RES_STATUS(priv->rx_msg->data[0]);
> > + if (status != priv->success_tag) {
> > + dev_err(dev, "Command Id[%d], Response Failure = 0x%x",
> > + ELE_FW_AUTH_REQ, status);
> > + ret = -1;
> > + }
> > +exit:
> > +
> > + return ret;
> > +}
> > diff --git a/drivers/firmware/imx/ele_base_msg.h
> b/drivers/firmware/imx/ele_base_msg.h
> > new file mode 100644
> > index 000000000000..3b3d2bf04a84
> > --- /dev/null
> > +++ b/drivers/firmware/imx/ele_base_msg.h
> > @@ -0,0 +1,70 @@
> > +/* SPDX-License-Identifier: GPL-2.0+ */
> > +/*
> > + * Copyright 2024 NXP
> > + *
> > + * Header file for the EdgeLock Enclave Base API(s).
> > + */
> > +
> > +#ifndef ELE_BASE_MSG_H
> > +#define ELE_BASE_MSG_H
> > +
> > +#include <linux/device.h>
> > +#include <linux/types.h>
> > +
> > +#define WORD_SZ 4
> > +#define ELE_NONE_VAL 0x0
> > +
> > +#define ELE_SUCCESS_IND 0xD6
> > +
> > +#define ELE_GET_INFO_REQ 0xDA
> > +#define ELE_GET_INFO_REQ_MSG_SZ 0x10
> > +#define ELE_GET_INFO_RSP_MSG_SZ 0x08
> > +
> > +#define ELE_GET_INFO_BUFF_SZ 0x100
> > +#define ELE_GET_INFO_READ_SZ 0xA0
> > +
> > +#define DEFAULT_IMX_SOC_VER 0xA0
> > +#define SOC_VER_MASK 0xFFFF0000
> > +#define SOC_ID_MASK 0x0000FFFF
> > +struct soc_info {
> > + u32 imem_state;
> > + u8 major_ver;
> > + u8 minor_ver;
> > + u16 soc_id;
> > + u16 soc_rev;
> > + u64 serial_num;
> > +};
> > +
> > +#define GET_INFO_SOC_INFO_WORD_OFFSET 1
> > +#define GET_INFO_UUID_WORD_OFFSET 3
> > +#define GET_INFO_SL_NUM_MSB_WORD_OFF \
> > + (GET_INFO_UUID_WORD_OFFSET + 3)
> > +#define GET_INFO_SL_NUM_LSB_WORD_OFF \
> > + (GET_INFO_UUID_WORD_OFFSET + 0)
> > +
> > +#define ELE_PING_REQ 0x01
> > +#define ELE_PING_REQ_SZ 0x04
> > +#define ELE_PING_RSP_SZ 0x08
> > +
> > +#define ELE_SERVICE_SWAP_REQ 0xDF
> > +#define ELE_SERVICE_SWAP_REQ_MSG_SZ 0x18
> > +#define ELE_SERVICE_SWAP_RSP_MSG_SZ 0x0C
> > +#define ELE_IMEM_SIZE 0x10000
> > +#define ELE_IMEM_STATE_OK 0xCA
> > +#define ELE_IMEM_STATE_BAD 0xFE
> > +#define ELE_IMEM_STATE_WORD 0x27
> > +#define ELE_IMEM_STATE_MASK 0x00ff0000
> > +#define ELE_IMEM_EXPORT 0x1
> > +#define ELE_IMEM_IMPORT 0x2
> > +
> > +#define ELE_FW_AUTH_REQ 0x02
> > +#define ELE_FW_AUTH_REQ_SZ 0x10
> > +#define ELE_FW_AUTH_RSP_MSG_SZ 0x08
> > +
> > +int ele_get_info(struct device *dev, struct soc_info *s_info);
> > +int ele_ping(struct device *dev);
> > +int ele_service_swap(struct device *dev,
> > + phys_addr_t addr,
> > + u32 addr_size, u16 flag);
> > +int ele_fw_authenticate(struct device *dev, phys_addr_t addr);
> > +#endif
> > diff --git a/drivers/firmware/imx/ele_common.c
> b/drivers/firmware/imx/ele_common.c
> > new file mode 100644
> > index 000000000000..dcf7f9034653
> > --- /dev/null
> > +++ b/drivers/firmware/imx/ele_common.c
> > @@ -0,0 +1,341 @@
> > +// SPDX-License-Identifier: GPL-2.0+
> > +/*
> > + * Copyright 2024 NXP
> > + */
> > +
> > +#include "ele_base_msg.h"
> > +#include "ele_common.h"
> > +
> > +u32 plat_add_msg_crc(u32 *msg, u32 msg_len)
> > +{
> > + u32 nb_words = msg_len / (u32)sizeof(u32);
> > + u32 crc = 0;
> > + u32 i;
> > +
> > + for (i = 0; i < nb_words - 1; i++)
> > + crc ^= *(msg + i);
> > +
> > + return crc;
> > +}
> > +
> > +int imx_ele_msg_rcv(struct se_if_priv *priv)
> > +{
> > + u32 wait;
> > + int err;
> > +
> > + wait = msecs_to_jiffies(1000);
> > + if (!wait_for_completion_timeout(&priv->done, wait)) {
> > + dev_err(priv->dev,
> > + "Error: wait_for_completion timed out.\n");
> > + err = -ETIMEDOUT;
> > + }
> > +
> > + mutex_unlock(&priv->se_if_cmd_lock);
> > + priv->no_dev_ctx_used = false;
> > +
> > + return err;
> > +}
> > +
> > +int imx_ele_msg_send(struct se_if_priv *priv, void *mssg)
> > +{
> > + bool is_cmd_lock_tobe_taken = false;
> > + int err;
> > +
> > + if (!priv->waiting_rsp_dev || priv->no_dev_ctx_used) {
> > + is_cmd_lock_tobe_taken = true;
> > + mutex_lock(&priv->se_if_cmd_lock);
> > + }
> > + scoped_guard(mutex, &priv->se_if_lock);
> > +
> > + err = mbox_send_message(priv->tx_chan, mssg);
> > + if (err < 0) {
> > + dev_err(priv->dev, "Error: mbox_send_message failure.\n");
> > + if (is_cmd_lock_tobe_taken)
> > + mutex_unlock(&priv->se_if_cmd_lock);
> > + return err;
> > + }
> > + err = 0;
> > +
> > + return err;
> > +}
> > +
> > +int imx_ele_msg_send_rcv(struct se_if_priv *priv, void *mssg)
> > +{
> > + int err;
> > +
> > + priv->no_dev_ctx_used = true;
> > + err = imx_ele_msg_send(priv, mssg);
> > + if (err)
> > + goto exit;
> > +
> > + err = imx_ele_msg_rcv(priv);
> > +
> > +exit:
> > + return err;
> > +}
> > +
> > +int imx_ele_miscdev_msg_rcv(struct se_if_device_ctx *dev_ctx)
> > +{
> > + struct se_msg_hdr header = {0};
> > + int err;
> > +
> > + err = wait_event_interruptible(dev_ctx->wq, dev_ctx-
> >pending_hdr != 0);
> > + if (err)
> > + dev_err(dev_ctx->dev,
> > + "%s: Err[0x%x]:Interrupted by signal.\n",
> > + dev_ctx->miscdev.name, err);
> > +
> > + header = *((struct se_msg_hdr *) (&dev_ctx->temp_resp[0]));
> > +
> > + if (header.tag == dev_ctx->priv->rsp_tag)
> > + mutex_unlock(&dev_ctx->priv->se_if_cmd_lock);
> > +
> > + return err;
> > +}
> > +
> > +int imx_ele_miscdev_msg_send(struct se_if_device_ctx *dev_ctx,
> > + void *tx_msg, int tx_msg_sz)
> > +{
> > + struct se_if_priv *priv = dev_ctx->priv;
> > + struct se_msg_hdr header = {0};
> > + int err;
> > +
> > + header = *((struct se_msg_hdr *) tx_msg);
> > +
> > + /*
> > + * Check that the size passed as argument matches the size
> > + * carried in the message.
> > + */
> > + err = header.size << 2;
> > +
> > + if (err != tx_msg_sz) {
> > + err = -EINVAL;
> > + dev_err(priv->dev,
> > + "%s: User buffer too small\n",
> > + dev_ctx->miscdev.name);
> > + goto exit;
> > + }
> > + /* Check the message is valid according to tags */
> > + if (header.tag == priv->cmd_tag)
> > + priv->waiting_rsp_dev = dev_ctx;
> > + else if (header.tag == priv->rsp_tag) {
> > + /* Check the device context can send the command */
> > + if (dev_ctx != priv->cmd_receiver_dev) {
> > + dev_err(priv->dev,
> > + "%s: Channel not configured to send resp to
> FW.",
> > + dev_ctx->miscdev.name);
> > + err = -EPERM;
> > + goto exit;
> > + }
> > + } else {
> > + dev_err(priv->dev,
> > + "%s: The message does not have a valid TAG\n",
> > + dev_ctx->miscdev.name);
> > + err = -EINVAL;
> > + goto exit;
> > + }
> > + err = imx_ele_msg_send(priv, tx_msg);
> > +exit:
> > + return err;
> > +}
> > +
> > +/*
> > + * Callback called by mailbox FW, when data is received.
> > + */
> > +void se_if_rx_callback(struct mbox_client *mbox_cl, void *msg)
> > +{
> > + struct device *dev = mbox_cl->dev;
> > + struct se_if_device_ctx *dev_ctx;
> > + struct se_api_msg *rx_msg;
> > + bool is_response = false;
> > + struct se_if_priv *priv;
> > + struct se_msg_hdr header;
> > +
> > + priv = dev_get_drvdata(dev);
> > + if (!priv) {
> > + dev_err(dev, "SE-MU Priv data is NULL;");
> > + return;
> > + }
> > +
> > + /* The function can be called with NULL msg */
> > + if (!msg) {
> > + dev_err(dev, "Message is invalid\n");
> > + return;
> > + }
> > +
> > + header.tag = ((u8 *)msg)[TAG_OFFSET];
> > + header.command = ((u8 *)msg)[CMD_OFFSET];
> > + header.size = ((u8 *)msg)[SZ_OFFSET];
> > + header.ver = ((u8 *)msg)[VER_OFFSET];
> > +
> > + /* Incoming command: wake up the receiver if any. */
> > + if (header.tag == priv->cmd_tag) {
> > + dev_dbg(dev, "Selecting cmd receiver\n");
> > + dev_ctx = priv->cmd_receiver_dev;
> > + } else if (header.tag == priv->rsp_tag) {
> > + if (priv->waiting_rsp_dev) {
> > + dev_dbg(dev, "Selecting rsp waiter\n");
> > + dev_ctx = priv->waiting_rsp_dev;
> > + is_response = true;
> > + } else {
> > + /*
> > + * Reading the EdgeLock Enclave response
> > + * to the command, sent by other
> > + * linux kernel services.
> > + */
> > + spin_lock(&priv->lock);
> > + memcpy(&priv->rx_msg, msg, header.size << 2);
> > +
> > + complete(&priv->done);
> > + spin_unlock(&priv->lock);
> > + return;
> > + }
> > + } else {
> > + dev_err(dev, "Failed to select a device for message: %.8x\n",
> > + *((u32 *) &header));
> > + return;
> > + }
> > + /* Init reception */
> > + rx_msg = kzalloc(header.size << 2, GFP_KERNEL);
> > + if (rx_msg)
> > + memcpy(rx_msg, msg, header.size << 2);
> > +
> > + dev_ctx->temp_resp = (u32 *)rx_msg;
> > + dev_ctx->temp_resp_size = header.size;
> > +
> > + /* Allow user to read */
> > + dev_ctx->pending_hdr = 1;
> > + wake_up_interruptible(&dev_ctx->wq);
> > +
> > + if (is_response)
> > + priv->waiting_rsp_dev = NULL;
> > +}
> > +
> > +int validate_rsp_hdr(struct se_if_priv *priv, u32 header,
> > + uint8_t msg_id, uint8_t sz, bool is_base_api)
> > +{
> > + int ret = -EINVAL;
> > + u32 size;
> > + u32 cmd;
> > + u32 tag;
> > + u32 ver;
> > +
> > + tag = MSG_TAG(header);
> > + cmd = MSG_COMMAND(header);
> > + size = MSG_SIZE(header);
> > + ver = MSG_VER(header);
> > +
> > + do {
> > + if (tag != priv->rsp_tag) {
> > + dev_err(priv->dev,
> > + "MSG[0x%x] Hdr: Resp tag mismatch.
> (0x%x != 0x%x)",
> > + msg_id, tag, priv->rsp_tag);
> > + break;
> > + }
> > +
> > + if (cmd != msg_id) {
> > + dev_err(priv->dev,
> > + "MSG Header: Cmd id mismatch. (0x%x !=
> 0x%x)",
> > + cmd, msg_id);
> > + break;
> > + }
> > +
> > + if (size != (sz >> 2)) {
> > + dev_err(priv->dev,
> > + "MSG[0x%x] Hdr: Cmd size mismatch.
> (0x%x != 0x%x)",
> > + msg_id, size, (sz >> 2));
> > + break;
> > + }
> > +
> > + if (is_base_api && (ver != priv->base_api_ver)) {
> > + dev_err(priv->dev,
> > + "MSG[0x%x] Hdr: Base API Vers mismatch.
> (0x%x != 0x%x)",
> > + msg_id, ver, priv->base_api_ver);
> > + break;
> > + } else if (!is_base_api && ver != priv->fw_api_ver) {
> > + dev_err(priv->dev,
> > + "MSG[0x%x] Hdr: FW API Vers mismatch.
> (0x%x != 0x%x)",
> > + msg_id, ver, priv->fw_api_ver);
> > + break;
> > + }
> > +
> > + ret = 0;
> > +
> > + } while (false);
> > +
> > + return ret;
> > +}
> > +
> > +int se_save_imem_state(struct device *dev)
> > +{
> > + struct se_if_priv *priv = dev_get_drvdata(dev);
> > + int ret;
> > +
> > + /* EXPORT command will save encrypted IMEM to given address,
> > + * so later in resume, IMEM can be restored from the given
> > + * address.
> > + *
> > + * Size must be at least 64 kB.
> > + */
> > + ret = ele_service_swap(dev,
> > + priv->imem.phyaddr,
> > + ELE_IMEM_SIZE,
> > + ELE_IMEM_EXPORT);
> > + if (ret < 0)
> > + dev_err(dev, "Failed to export IMEM\n");
> > + else
> > + dev_info(dev,
> > + "Exported %d bytes of encrypted IMEM\n",
> > + ret);
> > +
> > + return ret;
> > +}
> > +
> > +int se_restore_imem_state(struct device *dev)
> > +{
> > + struct se_if_priv *priv = dev_get_drvdata(dev);
> > + struct soc_info s_info;
> > + int ret;
> > +
> > + /* get info from ELE */
> > + ret = ele_get_info(dev, &s_info);
> > + if (ret) {
> > + dev_err(dev, "Failed to get info from ELE.\n");
> > + return ret;
> > + }
> > +
> > + /* Get IMEM state, if 0xFE then import IMEM */
> > + if (s_info.imem_state == ELE_IMEM_STATE_BAD) {
> > + /* IMPORT command will restore IMEM from the given
> > + * address, here size is the actual size returned by ELE
> > + * during the export operation
> > + */
> > + ret = ele_service_swap(dev,
> > + priv->imem.phyaddr,
> > + priv->imem.size,
> > + ELE_IMEM_IMPORT);
> > + if (ret) {
> > + dev_err(dev, "Failed to import IMEM\n");
> > + goto exit;
> > + }
> > + } else
> > + goto exit;
> > +
> > + /* After importing IMEM, check if IMEM state is equal to 0xCA
> > + * to ensure IMEM is fully loaded and
> > + * ELE functionality can be used.
> > + */
> > + ret = ele_get_info(dev, &s_info);
> > + if (ret) {
> > + dev_err(dev, "Failed to get info from ELE.\n");
> > + goto exit;
> > + }
> > +
> > + if (s_info.imem_state == ELE_IMEM_STATE_OK)
> > + dev_info(dev, "Successfully restored IMEM\n");
> > + else
> > + dev_err(dev, "Failed to restore IMEM\n");
> > +
> > +exit:
> > + return ret;
> > +}
> > diff --git a/drivers/firmware/imx/ele_common.h
> b/drivers/firmware/imx/ele_common.h
> > new file mode 100644
> > index 000000000000..6e3a2114bb56
> > --- /dev/null
> > +++ b/drivers/firmware/imx/ele_common.h
> > @@ -0,0 +1,43 @@
> > +/* SPDX-License-Identifier: GPL-2.0+ */
> > +/*
> > + * Copyright 2024 NXP
> > + */
> > +
> > +
> > +#ifndef __ELE_COMMON_H__
> > +#define __ELE_COMMON_H__
> > +
> > +#include "se_ctrl.h"
> > +
> > +#define IMX_ELE_FW_DIR "imx/ele/"
> > +
> > +uint32_t plat_add_msg_crc(uint32_t *msg, uint32_t msg_len);
> > +int imx_ele_miscdev_msg_rcv(struct se_if_device_ctx *priv);
> > +int imx_ele_miscdev_msg_send(struct se_if_device_ctx *dev_ctx,
> > + void *tx_msg, int tx_msg_sz);
> > +int imx_ele_msg_rcv(struct se_if_priv *priv);
> > +int imx_ele_msg_send(struct se_if_priv *priv, void *mssg);
> > +int imx_ele_msg_send_rcv(struct se_if_priv *priv, void *mssg);
> > +void se_if_rx_callback(struct mbox_client *mbox_cl, void *msg);
> > +int validate_rsp_hdr(struct se_if_priv *priv, unsigned int header,
> > + u8 msg_id, u8 sz, bool is_base_api);
> > +
> > +/* Fill a command message header with a given command ID and length in
> bytes. */
> > +static inline int plat_fill_cmd_msg_hdr(struct se_if_priv *priv,
> > + struct se_msg_hdr *hdr,
> > + u8 cmd,
> > + u32 len,
> > + bool is_base_api)
> > +{
> > + hdr->tag = priv->cmd_tag;
> > + hdr->ver = (is_base_api) ? priv->base_api_ver : priv->fw_api_ver;
> > + hdr->command = cmd;
> > + hdr->size = len >> 2;
> > +
> > + return 0;
> > +}
> > +
> > +int se_save_imem_state(struct device *dev);
> > +int se_restore_imem_state(struct device *dev);
> > +
> > +#endif /*__ELE_COMMON_H__ */
> > diff --git a/drivers/firmware/imx/se_ctrl.c b/drivers/firmware/imx/se_ctrl.c
> > new file mode 100644
> > index 000000000000..11c5eaa7353f
> > --- /dev/null
> > +++ b/drivers/firmware/imx/se_ctrl.c
> > @@ -0,0 +1,1339 @@
> > +// SPDX-License-Identifier: GPL-2.0+
> > +/*
> > + * Copyright 2024 NXP
> > + */
> > +
> > +#include <linux/completion.h>
> > +#include <linux/delay.h>
> > +#include <linux/dev_printk.h>
> > +#include <linux/dma-mapping.h>
> > +#include <linux/errno.h>
> > +#include <linux/export.h>
> > +#include <linux/firmware.h>
> > +#include <linux/firmware/imx/se_api.h>
> > +#include <linux/genalloc.h>
> > +#include <linux/init.h>
> > +#include <linux/io.h>
> > +#include <linux/miscdevice.h>
> > +#include <linux/mod_devicetable.h>
> > +#include <linux/module.h>
> > +#include <linux/of_platform.h>
> > +#include <linux/of_reserved_mem.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/slab.h>
> > +#include <linux/string.h>
> > +#include <linux/sys_soc.h>
> > +#include <uapi/linux/se_ioctl.h>
> > +
> > +#include "ele_base_msg.h"
> > +#include "ele_common.h"
> > +#include "se_ctrl.h"
> > +
> > +#define RESERVED_DMA_POOL BIT(1)
> > +
> > +struct imx_se_node_info {
> > + u8 se_if_id;
> > + u8 se_if_did;
> > + u8 max_dev_ctx;
> > + u8 cmd_tag;
> > + u8 rsp_tag;
> > + u8 success_tag;
> > + u8 base_api_ver;
> > + u8 fw_api_ver;
> > + u8 *se_name;
> > + u8 *mbox_tx_name;
> > + u8 *mbox_rx_name;
> > + u8 *pool_name;
> > + u8 *fw_name_in_rfs;
> > + bool soc_register;
> > + bool reserved_dma_ranges;
> > + bool imem_mgmt;
> > +};
> > +
> > +struct imx_se_node_info_list {
> > + u8 num_mu;
> > + u16 soc_id;
> > + u16 soc_rev;
> > + struct imx_se_node_info info[];
> > +};
> > +
> > +static const struct imx_se_node_info_list imx8ulp_info = {
> > + .num_mu = 1,
> > + .soc_id = SOC_ID_OF_IMX8ULP,
> > + .info = {
> > + {
> > + .se_if_id = 2,
> > + .se_if_did = 7,
> > + .max_dev_ctx = 4,
> > + .cmd_tag = 0x17,
> > + .rsp_tag = 0xe1,
> > + .success_tag = 0xd6,
> > + .base_api_ver = MESSAGING_VERSION_6,
> > + .fw_api_ver = MESSAGING_VERSION_7,
> > + .se_name = "hsm1",
> > + .mbox_tx_name = "tx",
> > + .mbox_rx_name = "rx",
> > + .pool_name = "sram",
> > + .fw_name_in_rfs = IMX_ELE_FW_DIR\
> > + "mx8ulpa2ext-ahab-
> container.img",
> > + .soc_register = true,
> > + .reserved_dma_ranges = true,
> > + .imem_mgmt = true,
> > + },
> > + },
> > +};
> > +
> > +static const struct imx_se_node_info_list imx93_info = {
> > + .num_mu = 1,
> > + .soc_id = SOC_ID_OF_IMX93,
> > + .info = {
> > + {
> > + .se_if_id = 2,
> > + .se_if_did = 3,
> > + .max_dev_ctx = 4,
> > + .cmd_tag = 0x17,
> > + .rsp_tag = 0xe1,
> > + .success_tag = 0xd6,
> > + .base_api_ver = MESSAGING_VERSION_6,
> > + .fw_api_ver = MESSAGING_VERSION_7,
> > + .se_name = "hsm1",
> > + .mbox_tx_name = "tx",
> > + .mbox_rx_name = "rx",
> > + .reserved_dma_ranges = true,
> > + .imem_mgmt = true,
> > + .soc_register = true,
> > + },
> > + },
> > +};
> > +
> > +static const struct of_device_id se_match[] = {
> > + { .compatible = "fsl,imx8ulp-ele", .data = (void *)&imx8ulp_info},
> > + { .compatible = "fsl,imx93-ele", .data = (void *)&imx93_info},
> > + {},
> > +};
> > +
> > +static struct imx_se_node_info
> > + *get_imx_se_node_info(struct imx_se_node_info_list
> *info_list,
> > + const u32 idx)
> > +{
> > + if (idx < 0 || idx > info_list->num_mu)
> > + return NULL;
> > +
> > + return &info_list->info[idx];
> > +}
> > +
> > +void *get_phy_buf_mem_pool(struct device *dev,
> > + u8 *mem_pool_name,
> > + dma_addr_t *buf,
> > + u32 size)
> > +{
> > + struct device_node *of_node = dev->of_node;
> > + struct gen_pool *mem_pool;
> > +
> > + mem_pool = of_gen_pool_get(of_node, mem_pool_name, 0);
> > + if (!mem_pool) {
> > + dev_err(dev,
> > + "Unable to get sram pool = %s\n",
> > + mem_pool_name);
> > + return 0;
> > + }
> > +
> > + return gen_pool_dma_alloc(mem_pool, size, buf);
> > +}
> > +
> > +void free_phybuf_mem_pool(struct device *dev,
> > + u8 *mem_pool_name,
> > + u32 *buf,
> > + u32 size)
> > +{
> > + struct device_node *of_node = dev->of_node;
> > + struct gen_pool *mem_pool;
> > +
> > + mem_pool = of_gen_pool_get(of_node, mem_pool_name, 0);
> > + if (!mem_pool)
> > + dev_err(dev,
> > + "%s: Failed: Unable to get sram pool.\n",
> > + __func__);
> > +
> > + gen_pool_free(mem_pool, (u64)buf, size);
> > +}
> > +
> > +static int imx_fetch_soc_info(struct device *dev)
> > +{
> > + struct se_if_priv *priv = dev_get_drvdata(dev);
> > + struct imx_se_node_info_list *info_list;
> > + const struct imx_se_node_info *info;
> > + struct soc_device_attribute *attr;
> > + struct soc_device *sdev;
> > + struct soc_info s_info;
> > + int err = 0;
> > +
> > + info = priv->info;
> > + info_list = (struct imx_se_node_info_list *)
> > + device_get_match_data(dev->parent);
> > + if (info_list->soc_rev)
> > + return err;
> > +
> > + err = ele_get_info(dev, &s_info);
> > + if (err)
> > + s_info.major_ver = DEFAULT_IMX_SOC_VER;
> > +
> > + info_list->soc_rev = s_info.soc_rev;
> > +
> > + if (!info->soc_register)
> > + return 0;
> > +
> > + attr = devm_kzalloc(dev, sizeof(*attr), GFP_KERNEL);
> > + if (!attr)
> > + return -ENOMEM;
> > +
> > + if (s_info.minor_ver)
> > + attr->revision = devm_kasprintf(dev, GFP_KERNEL, "%x.%x",
> > + s_info.major_ver,
> > + s_info.minor_ver);
> > + else
> > + attr->revision = devm_kasprintf(dev, GFP_KERNEL, "%x",
> > + s_info.major_ver);
> > +
> > + switch (s_info.soc_id) {
> > + case SOC_ID_OF_IMX8ULP:
> > + attr->soc_id = devm_kasprintf(dev, GFP_KERNEL,
> > + "i.MX8ULP");
> > + break;
> > + case SOC_ID_OF_IMX93:
> > + attr->soc_id = devm_kasprintf(dev, GFP_KERNEL,
> > + "i.MX93");
> > + break;
> > + }
> > +
> > + err = of_property_read_string(of_root, "model",
> > + &attr->machine);
> > + if (err) {
> > + devm_kfree(dev, attr);
> > + return -EINVAL;
> > + }
> > + attr->family = devm_kasprintf(dev, GFP_KERNEL, "Freescale i.MX");
> > +
> > + attr->serial_number
> > + = devm_kasprintf(dev, GFP_KERNEL, "%016llX",
> s_info.serial_num);
> > +
> > + sdev = soc_device_register(attr);
> > + if (IS_ERR(sdev)) {
> > + devm_kfree(dev, attr->soc_id);
> > + devm_kfree(dev, attr->serial_number);
> > + devm_kfree(dev, attr->revision);
> > + devm_kfree(dev, attr->family);
> > + devm_kfree(dev, attr->machine);
> > + devm_kfree(dev, attr);
> > + return PTR_ERR(sdev);
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +/*
> > + * File operations for user-space
> > + */
> > +
> > +/* Write a message to the MU. */
> > +static ssize_t se_if_fops_write(struct file *fp, const char __user *buf,
> > + size_t size, loff_t *ppos)
> > +{
> > + struct se_api_msg *tx_msg __free(kfree);
> > + struct se_if_device_ctx *dev_ctx;
> > + struct se_if_priv *priv;
> > + int err;
> > +
> > + dev_ctx = container_of(fp->private_data,
> > + struct se_if_device_ctx,
> > + miscdev);
> > + priv = dev_ctx->priv;
> > + dev_dbg(priv->dev,
> > + "%s: write from buf (%p)%zu, ppos=%lld\n",
> > + dev_ctx->miscdev.name,
> > + buf, size, ((ppos) ? *ppos : 0));
> > +
> > + if (down_interruptible(&dev_ctx->fops_lock))
> > + return -EBUSY;
> > +
> > + if (dev_ctx->status != MU_OPENED) {
> > + err = -EINVAL;
> > + goto exit;
> > + }
> > +
> > + if (size < SE_MU_HDR_SZ) {
> > + dev_err(priv->dev,
> > + "%s: User buffer too small(%zu < %d)\n",
> > + dev_ctx->miscdev.name,
> > + size, SE_MU_HDR_SZ);
> > + err = -ENOSPC;
> > + goto exit;
> > + }
> > +
> > + tx_msg = memdup_user((void __user *)ppos, size);
> > + if (!tx_msg) {
> > + err = -ENOMEM;
> > + goto exit;
> > + }
> > +
> > + /* Copy data to buffer */
> > + if (copy_from_user(tx_msg, buf, size)) {
> > + err = -EFAULT;
> > + dev_err(priv->dev,
> > + "%s: Fail copy message from user\n",
> > + dev_ctx->miscdev.name);
> > + goto exit;
> > + }
> > +
> > + print_hex_dump_debug("from user ", DUMP_PREFIX_OFFSET, 4, 4,
> > + tx_msg, size, false);
> > +
> > + err = imx_ele_miscdev_msg_send(dev_ctx, tx_msg, size);
> > +
> > +exit:
> > + up(&dev_ctx->fops_lock);
> > + return err;
> > +}
> > +
> > +/*
> > + * Read a message from the MU.
> > + * Blocking until a message is available.
> > + */
> > +static ssize_t se_if_fops_read(struct file *fp, char __user *buf,
> > + size_t size, loff_t *ppos)
> > +{
> > + struct se_if_device_ctx *dev_ctx;
> > + struct se_buf_desc *b_desc;
> > + struct se_if_priv *priv;
> > + u32 size_to_copy;
> > + int err;
> > +
> > + dev_ctx = container_of(fp->private_data,
> > + struct se_if_device_ctx,
> > + miscdev);
> > + priv = dev_ctx->priv;
> > + dev_dbg(priv->dev,
> > + "%s: read to buf %p(%zu), ppos=%lld\n",
> > + dev_ctx->miscdev.name,
> > + buf, size, ((ppos) ? *ppos : 0));
> > +
> > + if (down_interruptible(&dev_ctx->fops_lock))
> > + return -EBUSY;
> > +
> > + if (dev_ctx->status != MU_OPENED) {
> > + err = -EINVAL;
> > + goto exit;
> > + }
> > +
> > + err = imx_ele_miscdev_msg_rcv(dev_ctx);
> > + if (err)
> > + goto exit;
> > +
> > + /* Buffer containing the message from FW, is
> > + * allocated in callback function.
> > + * Check if buffer allocation failed.
> > + */
> > + if (!dev_ctx->temp_resp) {
> > + err = -ENOMEM;
> > + goto exit;
> > + }
> > +
> > + dev_dbg(priv->dev,
> > + "%s: %s %s\n",
> > + dev_ctx->miscdev.name,
> > + __func__,
> > + "message received, start transmit to user");
> > +
> > + /*
> > + * Check that the size passed as argument is larger than
> > + * the one carried in the message.
> > + */
> > + size_to_copy = dev_ctx->temp_resp_size << 2;
> > + if (size_to_copy > size) {
> > + dev_dbg(priv->dev,
> > + "%s: User buffer too small (%zu < %d)\n",
> > + dev_ctx->miscdev.name,
> > + size, size_to_copy);
> > + size_to_copy = size;
> > + }
> > +
> > + /*
> > + * We may need to copy the output data to user before
> > + * delivering the completion message.
> > + */
> > + while (!list_empty(&dev_ctx->pending_out)) {
> > + b_desc = list_first_entry_or_null(&dev_ctx->pending_out,
> > + struct se_buf_desc,
> > + link);
> > + if (!b_desc)
> > + continue;
> > +
> > + if (b_desc->usr_buf_ptr && b_desc->shared_buf_ptr) {
> > +
> > + dev_dbg(priv->dev,
> > + "%s: Copy output data to user\n",
> > + dev_ctx->miscdev.name);
> > + if (copy_to_user(b_desc->usr_buf_ptr,
> > + b_desc->shared_buf_ptr,
> > + b_desc->size)) {
> > + dev_err(priv->dev,
> > + "%s: Failure copying output data to
> user.",
> > + dev_ctx->miscdev.name);
> > + err = -EFAULT;
> > + goto exit;
> > + }
> > + }
> > +
> > + if (b_desc->shared_buf_ptr)
> > + memset(b_desc->shared_buf_ptr, 0, b_desc->size);
> > +
> > + __list_del_entry(&b_desc->link);
> > + kfree(b_desc);
> > + }
> > +
> > + /* Copy data from the buffer */
> > + print_hex_dump_debug("to user ", DUMP_PREFIX_OFFSET, 4, 4,
> > + dev_ctx->temp_resp, size_to_copy, false);
> > + if (copy_to_user(buf, dev_ctx->temp_resp, size_to_copy)) {
> > + dev_err(priv->dev,
> > + "%s: Failed to copy to user\n",
> > + dev_ctx->miscdev.name);
> > + err = -EFAULT;
> > + goto exit;
> > + }
> > +
> > + err = size_to_copy;
> > + kfree(dev_ctx->temp_resp);
> > +
> > + /* free memory allocated on the shared buffers. */
> > + dev_ctx->secure_mem.pos = 0;
> > + dev_ctx->non_secure_mem.pos = 0;
> > +
> > + dev_ctx->pending_hdr = 0;
> > +
> > +exit:
> > + /*
> > + * Clean the used Shared Memory space,
> > + * whether its Input Data copied from user buffers, or
> > + * Data received from FW.
> > + */
> > + while (!list_empty(&dev_ctx->pending_in) ||
> > + !list_empty(&dev_ctx->pending_out)) {
> > + if (!list_empty(&dev_ctx->pending_in))
> > + b_desc = list_first_entry_or_null(&dev_ctx-
> >pending_in,
> > + struct se_buf_desc,
> > + link);
> > + else
> > + b_desc = list_first_entry_or_null(&dev_ctx-
> >pending_out,
> > + struct se_buf_desc,
> > + link);
> > +
> > + if (!b_desc)
> > + continue;
> > +
> > + if (b_desc->shared_buf_ptr)
> > + memset(b_desc->shared_buf_ptr, 0, b_desc->size);
> > +
> > + __list_del_entry(&b_desc->link);
> > + kfree(b_desc);
> > + }
> > +
> > + up(&dev_ctx->fops_lock);
> > + return err;
> > +}
> > +
> > +/* Give access to EdgeLock Enclave, to the memory we want to share */
> > +static int se_if_setup_se_mem_access(struct se_if_device_ctx *dev_ctx,
> > + u64 addr, u32 len)
> > +{
> > + /* Assuming EdgeLock Enclave has access to all the memory regions
> */
> > + int ret = 0;
> > +
> > + if (ret) {
> > + dev_err(dev_ctx->priv->dev,
> > + "%s: Fail find memreg\n", dev_ctx->miscdev.name);
> > + goto exit;
> > + }
> > +
> > + if (ret) {
> > + dev_err(dev_ctx->priv->dev,
> > + "%s: Fail set permission for resource\n",
> > + dev_ctx->miscdev.name);
> > + goto exit;
> > + }
> > +
> > +exit:
> > + return ret;
> > +}
> > +
> > +static int se_ioctl_get_mu_info(struct se_if_device_ctx *dev_ctx,
> > + u64 arg)
> > +{
> > + struct se_if_priv *priv = dev_get_drvdata(dev_ctx->dev);
> > + struct imx_se_node_info *if_node_info;
> > + struct se_ioctl_get_if_info info;
> > + int err = 0;
> > +
> > + if_node_info = (struct imx_se_node_info *)priv->info;
> > +
> > + info.se_if_id = if_node_info->se_if_id;
> > + info.interrupt_idx = 0;
> > + info.tz = 0;
> > + info.did = if_node_info->se_if_did;
> > + info.cmd_tag = if_node_info->cmd_tag;
> > + info.rsp_tag = if_node_info->rsp_tag;
> > + info.success_tag = if_node_info->success_tag;
> > + info.base_api_ver = if_node_info->base_api_ver;
> > + info.fw_api_ver = if_node_info->fw_api_ver;
> > +
> > + dev_dbg(priv->dev,
> > + "%s: info [se_if_id: %d, irq_idx: %d, tz: 0x%x, did: 0x%x]\n",
> > + dev_ctx->miscdev.name,
> > + info.se_if_id, info.interrupt_idx, info.tz, info.did);
> > +
> > + if (copy_to_user((u8 *)arg, &info, sizeof(info))) {
> > + dev_err(dev_ctx->priv->dev,
> > + "%s: Failed to copy mu info to user\n",
> > + dev_ctx->miscdev.name);
> > + err = -EFAULT;
> > + goto exit;
> > + }
> > +
> > +exit:
> > + return err;
> > +}
> > +
> > +/*
> > + * Copy a buffer of data to/from the user and return the address to use in
> > + * messages
> > + */
> > +static int se_ioctl_setup_iobuf_handler(struct se_if_device_ctx *dev_ctx,
> > + u64 arg)
> > +{
> > + struct se_ioctl_setup_iobuf io = {0};
> > + struct se_shared_mem *shared_mem;
> > + struct se_buf_desc *b_desc;
> > + int err = 0;
> > + u32 pos;
> > +
> > + if (copy_from_user(&io, (u8 *)arg, sizeof(io))) {
> > + dev_err(dev_ctx->priv->dev,
> > + "%s: Failed copy iobuf config from user\n",
> > + dev_ctx->miscdev.name);
> > + err = -EFAULT;
> > + goto exit;
> > + }
> > +
> > + dev_dbg(dev_ctx->priv->dev,
> > + "%s: io [buf: %p(%d) flag: %x]\n",
> > + dev_ctx->miscdev.name,
> > + io.user_buf, io.length, io.flags);
> > +
> > + if (io.length == 0 || !io.user_buf) {
> > + /*
> > + * Accept NULL pointers since some buffers are optional
> > + * in FW commands. In this case we should return 0 as
> > + * pointer to be embedded into the message.
> > + * Skip all data copy part of code below.
> > + */
> > + io.ele_addr = 0;
> > + goto copy;
> > + }
> > +
> > + /* Select the shared memory to be used for this buffer. */
> > + if (io.flags & SE_MU_IO_FLAGS_USE_SEC_MEM) {
> > + /* App requires to use secure memory for this buffer.*/
> > + dev_err(dev_ctx->priv->dev,
> > + "%s: Failed allocate SEC MEM memory\n",
> > + dev_ctx->miscdev.name);
> > + err = -EFAULT;
> > + goto exit;
> > + } else {
> > + /* No specific requirement for this buffer. */
> > + shared_mem = &dev_ctx->non_secure_mem;
> > + }
> > +
> > + /* Check there is enough space in the shared memory. */
> > + if (shared_mem->size < shared_mem->pos
> > + || io.length >= shared_mem->size - shared_mem-
> >pos) {
> > + dev_err(dev_ctx->priv->dev,
> > + "%s: Not enough space in shared memory\n",
> > + dev_ctx->miscdev.name);
> > + err = -ENOMEM;
> > + goto exit;
> > + }
> > +
> > + /* Allocate space in shared memory. 8 bytes aligned. */
> > + pos = shared_mem->pos;
> > + shared_mem->pos += round_up(io.length, 8u);
> > + io.ele_addr = (u64)shared_mem->dma_addr + pos;
> > +
> > + if ((io.flags & SE_MU_IO_FLAGS_USE_SEC_MEM) &&
> > + !(io.flags & SE_MU_IO_FLAGS_USE_SHORT_ADDR)) {
> > + /*Add base address to get full address.*/
> > + dev_err(dev_ctx->priv->dev,
> > + "%s: Failed allocate SEC MEM memory\n",
> > + dev_ctx->miscdev.name);
> > + err = -EFAULT;
> > + goto exit;
> > + }
> > +
> > + memset(shared_mem->ptr + pos, 0, io.length);
> > + if ((io.flags & SE_IO_BUF_FLAGS_IS_INPUT) ||
> > + (io.flags & SE_IO_BUF_FLAGS_IS_IN_OUT)) {
> > + /*
> > + * buffer is input:
> > + * copy data from user space to this allocated buffer.
> > + */
> > + if (copy_from_user(shared_mem->ptr + pos, io.user_buf,
> > + io.length)) {
> > + dev_err(dev_ctx->priv->dev,
> > + "%s: Failed copy data to shared memory\n",
> > + dev_ctx->miscdev.name);
> > + err = -EFAULT;
> > + goto exit;
> > + }
> > + }
> > +
> > + b_desc = kzalloc(sizeof(*b_desc), GFP_KERNEL);
> > + if (!b_desc) {
> > + err = -ENOMEM;
> > + goto exit;
> > + }
> > +
> > +copy:
> > + /* Provide the EdgeLock Enclave address to user space only if
> success.*/
> > + if (copy_to_user((u8 *)arg, &io, sizeof(io))) {
> > + dev_err(dev_ctx->priv->dev,
> > + "%s: Failed to copy iobuff setup to user\n",
> > + dev_ctx->miscdev.name);
> > + kfree(b_desc);
> > + err = -EFAULT;
> > + goto exit;
> > + }
> > +
> > + if (b_desc) {
> > + b_desc->shared_buf_ptr = shared_mem->ptr + pos;
> > + b_desc->usr_buf_ptr = io.user_buf;
> > + b_desc->size = io.length;
> > +
> > + if (io.flags & SE_IO_BUF_FLAGS_IS_INPUT) {
> > + /*
> > + * buffer is input:
> > + * add an entry in the "pending input buffers" list so
> > + * that copied data can be cleaned from shared
> memory
> > + * later.
> > + */
> > + list_add_tail(&b_desc->link, &dev_ctx->pending_in);
> > + } else {
> > + /*
> > + * buffer is output:
> > + * add an entry in the "pending out buffers" list so
> data
> > + * can be copied to user space when receiving Secure-
> Enclave
> > + * response.
> > + */
> > + list_add_tail(&b_desc->link, &dev_ctx->pending_out);
> > + }
> > + }
> > +
> > +exit:
> > + return err;
> > +}
> > +
> > +/* IOCTL to provide SoC information */
> > +static int se_ioctl_get_soc_info_handler(struct se_if_device_ctx *dev_ctx,
> > + u64 arg)
> > +{
> > + struct imx_se_node_info_list *info_list;
> > + struct se_ioctl_get_soc_info soc_info;
> > + int err = -EINVAL;
> > +
> > + info_list = (struct imx_se_node_info_list *)
> > + device_get_match_data(dev_ctx->priv->dev-
> >parent);
> > + if (!info_list)
> > + goto exit;
> > +
> > + soc_info.soc_id = info_list->soc_id;
> > + soc_info.soc_rev = info_list->soc_rev;
> > +
> > + err = (int)copy_to_user((u8 *)arg, (u8 *)(&soc_info), sizeof(soc_info));
> > + if (err) {
> > + dev_err(dev_ctx->priv->dev,
> > + "%s: Failed to copy soc info to user\n",
> > + dev_ctx->miscdev.name);
> > + err = -EFAULT;
> > + goto exit;
> > + }
> > +
> > +exit:
> > + return err;
> > +}
> > +
> > +/* Open a character device. */
> > +static int se_if_fops_open(struct inode *nd, struct file *fp)
> > +{
> > + struct se_if_device_ctx *dev_ctx = container_of(fp->private_data,
> > + struct
> se_if_device_ctx,
> > + miscdev);
> > + int err;
> > +
> > + /* Avoid race if opened at the same time */
> > + if (down_trylock(&dev_ctx->fops_lock))
> > + return -EBUSY;
> > +
> > + /* Authorize only 1 instance. */
> > + if (dev_ctx->status != MU_FREE) {
> > + err = -EBUSY;
> > + goto exit;
> > + }
> > +
> > + /*
> > + * Allocate some memory for data exchanges with S40x.
> > + * This will be used for data not requiring secure memory.
> > + */
> > + dev_ctx->non_secure_mem.ptr = dmam_alloc_coherent(dev_ctx-
> >dev,
> > + MAX_DATA_SIZE_PER_USER,
> > + &dev_ctx-
> >non_secure_mem.dma_addr,
> > + GFP_KERNEL);
> > + if (!dev_ctx->non_secure_mem.ptr) {
> > + err = -ENOMEM;
> > + goto exit;
> > + }
> > +
> > + err = se_if_setup_se_mem_access(dev_ctx,
> > + dev_ctx-
> >non_secure_mem.dma_addr,
> > + MAX_DATA_SIZE_PER_USER);
> > + if (err) {
> > + err = -EPERM;
> > + dev_err(dev_ctx->priv->dev,
> > + "%s: Failed to share access to shared memory\n",
> > + dev_ctx->miscdev.name);
> > + goto free_coherent;
> > + }
> > +
> > + dev_ctx->non_secure_mem.size = MAX_DATA_SIZE_PER_USER;
> > + dev_ctx->non_secure_mem.pos = 0;
> > + dev_ctx->status = MU_OPENED;
> > +
> > + dev_ctx->pending_hdr = 0;
> > +
> > + goto exit;
> > +
> > +free_coherent:
> > + dmam_free_coherent(dev_ctx->priv->dev,
> MAX_DATA_SIZE_PER_USER,
> > + dev_ctx->non_secure_mem.ptr,
> > + dev_ctx->non_secure_mem.dma_addr);
> > +
> > +exit:
> > + up(&dev_ctx->fops_lock);
> > + return err;
> > +}
> > +
> > +/* Close a character device. */
> > +static int se_if_fops_close(struct inode *nd, struct file *fp)
> > +{
> > + struct se_if_device_ctx *dev_ctx = container_of(fp->private_data,
> > + struct
> se_if_device_ctx,
> > + miscdev);
> > + struct se_if_priv *priv = dev_ctx->priv;
> > + struct se_buf_desc *b_desc;
> > +
> > + /* Avoid race if closed at the same time */
> > + if (down_trylock(&dev_ctx->fops_lock))
> > + return -EBUSY;
> > +
> > + /* The device context has not been opened */
> > + if (dev_ctx->status != MU_OPENED)
> > + goto exit;
> > +
> > + /* check if this device was registered as command receiver. */
> > + if (priv->cmd_receiver_dev == dev_ctx)
> > + priv->cmd_receiver_dev = NULL;
> > +
> > + /* check if this device was registered as waiting response. */
> > + if (priv->waiting_rsp_dev == dev_ctx) {
> > + priv->waiting_rsp_dev = NULL;
> > + mutex_unlock(&priv->se_if_cmd_lock);
> > + }
> > +
> > + /* Unmap secure memory shared buffer. */
> > + if (dev_ctx->secure_mem.ptr)
> > + devm_iounmap(dev_ctx->dev, dev_ctx->secure_mem.ptr);
> > +
> > + dev_ctx->secure_mem.ptr = NULL;
> > + dev_ctx->secure_mem.dma_addr = 0;
> > + dev_ctx->secure_mem.size = 0;
> > + dev_ctx->secure_mem.pos = 0;
> > +
> > + /* Free non-secure shared buffer. */
> > + dmam_free_coherent(dev_ctx->priv->dev,
> MAX_DATA_SIZE_PER_USER,
> > + dev_ctx->non_secure_mem.ptr,
> > + dev_ctx->non_secure_mem.dma_addr);
> > +
> > + dev_ctx->non_secure_mem.ptr = NULL;
> > + dev_ctx->non_secure_mem.dma_addr = 0;
> > + dev_ctx->non_secure_mem.size = 0;
> > + dev_ctx->non_secure_mem.pos = 0;
> > +
> > + while (!list_empty(&dev_ctx->pending_in) ||
> > + !list_empty(&dev_ctx->pending_out)) {
> > + if (!list_empty(&dev_ctx->pending_in))
> > + b_desc = list_first_entry_or_null(&dev_ctx-
> >pending_in,
> > + struct se_buf_desc,
> > + link);
> > + else
> > + b_desc = list_first_entry_or_null(&dev_ctx-
> >pending_out,
> > + struct se_buf_desc,
> > + link);
> > +
> > + if (!b_desc)
> > + continue;
> > +
> > + if (b_desc->shared_buf_ptr)
> > + memset(b_desc->shared_buf_ptr, 0, b_desc->size);
> > +
> > + __list_del_entry(&b_desc->link);
> > + devm_kfree(dev_ctx->dev, b_desc);
> > + }
> > +
> > + dev_ctx->status = MU_FREE;
> > +
> > +exit:
> > + up(&dev_ctx->fops_lock);
> > + return 0;
> > +}
> > +
> > +/* IOCTL entry point of a character device */
> > +static long se_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
> > +//static long se_ioctl(struct file *fp, u32 cmd, u64 arg)
> > +{
> > + struct se_if_device_ctx *dev_ctx = container_of(fp->private_data,
> > + struct
> se_if_device_ctx,
> > + miscdev);
> > + struct se_if_priv *se_if_priv = dev_ctx->priv;
> > + int err = -EINVAL;
> > +
> > + /* Prevent race during change of device context */
> > + if (down_interruptible(&dev_ctx->fops_lock))
> > + return -EBUSY;
> > +
> > + switch (cmd) {
> > + case SE_IOCTL_ENABLE_CMD_RCV:
> > + if (!se_if_priv->cmd_receiver_dev) {
> > + se_if_priv->cmd_receiver_dev = dev_ctx;
> > + err = 0;
> > + }
> > + break;
> > + case SE_IOCTL_GET_MU_INFO:
> > + err = se_ioctl_get_mu_info(dev_ctx, arg);
> > + break;
> > + case SE_IOCTL_SETUP_IOBUF:
> > + err = se_ioctl_setup_iobuf_handler(dev_ctx, arg);
> > + break;
> > + case SE_IOCTL_GET_SOC_INFO:
> > + err = se_ioctl_get_soc_info_handler(dev_ctx, arg);
> > + break;
> > +
> > + default:
> > + err = -EINVAL;
> > + dev_dbg(se_if_priv->dev,
> > + "%s: IOCTL %.8x not supported\n",
> > + dev_ctx->miscdev.name,
> > + cmd);
> > + }
> > +
> > + up(&dev_ctx->fops_lock);
> > + return (long)err;
> > +}
> > +
> > +/* Char driver setup */
> > +static const struct file_operations se_if_fops = {
> > + .open = se_if_fops_open,
> > + .owner = THIS_MODULE,
> > + .release = se_if_fops_close,
> > + .unlocked_ioctl = se_ioctl,
> > + .read = se_if_fops_read,
> > + .write = se_if_fops_write,
> > +};
> > +
> > +/* interface for managed res to free a mailbox channel */
> > +static void if_mbox_free_channel(void *mbox_chan)
> > +{
> > + mbox_free_channel(mbox_chan);
> > +}
> > +
> > +/* interface for managed res to unregister a character device */
> > +static void if_misc_deregister(void *miscdevice)
> > +{
> > + misc_deregister(miscdevice);
> > +}
> > +
> > +static int se_if_request_channel(struct device *dev,
> > + struct mbox_chan **chan,
> > + struct mbox_client *cl,
> > + const u8 *name)
> > +{
> > + struct mbox_chan *t_chan;
> > + int ret = 0;
> > +
> > + t_chan = mbox_request_channel_byname(cl, name);
> > + if (IS_ERR(t_chan)) {
> > + ret = PTR_ERR(t_chan);
> > + if (ret != -EPROBE_DEFER)
> > + dev_err(dev,
> > + "Failed to request chan %s ret %d\n", name,
> > + ret);
> > + goto exit;
> > + }
> > +
> > + ret = devm_add_action(dev, if_mbox_free_channel, t_chan);
> > + if (ret) {
> > + dev_err(dev, "failed to add devm removal of mbox %s\n",
> name);
> > + goto exit;
> > + }
> > +
> > + *chan = t_chan;
> > +
> > +exit:
> > + return ret;
> > +}
> > +
> > +static int se_probe_if_cleanup(struct platform_device *pdev)
> > +{
> > + struct device *dev = &pdev->dev;
> > + struct se_if_priv *priv;
> > + int ret = 0;
> > + int i;
> > +
> > + priv = dev_get_drvdata(dev);
> > + if (!priv) {
> > + ret = 0;
> > + dev_dbg(dev, "SE-MU Priv data is NULL;");
> > + return ret;
> > + }
> > +
> > + if (priv->tx_chan)
> > + mbox_free_channel(priv->tx_chan);
> > + if (priv->rx_chan)
> > + mbox_free_channel(priv->rx_chan);
> > +
> > + /* free the buffer in se remove, previously allocated
> > + * in se probe to store encrypted IMEM
> > + */
> > + if (priv->imem.buf) {
> > + dmam_free_coherent(dev,
> > + ELE_IMEM_SIZE,
> > + priv->imem.buf,
> > + priv->imem.phyaddr);
> > + priv->imem.buf = NULL;
> > + }
> > +
> > + if (priv->ctxs) {
> > + for (i = 0; i < priv->max_dev_ctx; i++) {
> > + if (priv->ctxs[i]) {
> > + devm_remove_action(dev,
> > + if_misc_deregister,
> > + &priv->ctxs[i]->miscdev);
> > + misc_deregister(&priv->ctxs[i]->miscdev);
> > + devm_kfree(dev, priv->ctxs[i]);
> > + }
> > + }
> > + devm_kfree(dev, priv->ctxs);
> > + }
> > +
> > + if (priv->flags & RESERVED_DMA_POOL) {
> > + of_reserved_mem_device_release(dev);
> > + priv->flags &= (~RESERVED_DMA_POOL);
> > + }
> > +
> > + devm_kfree(dev, priv);
> > + of_node_put(dev->of_node);
> > + of_platform_device_destroy(dev, NULL);
> > +
> > + return ret;
> > +}
> > +
> > +static int se_probe_cleanup(struct platform_device *pdev)
> > +{
> > + struct device *dev = &pdev->dev;
> > + struct device_node *if_dn;
> > +
> > + /* Enumerate se-interface device nodes. */
> > + for_each_child_of_node(dev->of_node, if_dn) {
> > + struct platform_device *if_pdev
> > + = of_find_device_by_node(if_dn);
> > + if (se_probe_if_cleanup(if_pdev))
> > + dev_err(dev,
> > + "Failed to clean-up child node probe.\n");
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static int init_device_context(struct device *dev)
> > +{
> > + const struct imx_se_node_info *info;
> > + struct se_if_device_ctx *dev_ctx;
> > + struct se_if_priv *priv;
> > + u8 *devname;
> > + int ret = 0;
> > + int i;
> > +
> > + priv = dev_get_drvdata(dev);
> > +
> > + if (!priv) {
> > + ret = -EINVAL;
> > + dev_err(dev, "Invalid SE-MU Priv data");
> > + return ret;
> > + }
> > + info = priv->info;
> > +
> > + priv->ctxs = devm_kzalloc(dev, sizeof(dev_ctx) * priv->max_dev_ctx,
> > + GFP_KERNEL);
> > +
> > + if (!priv->ctxs) {
> > + ret = -ENOMEM;
> > + return ret;
> > + }
> > +
> > + /* Create users */
> > + for (i = 0; i < priv->max_dev_ctx; i++) {
> > + dev_ctx = devm_kzalloc(dev, sizeof(*dev_ctx), GFP_KERNEL);
> > + if (!dev_ctx) {
> > + ret = -ENOMEM;
> > + return ret;
> > + }
> > +
> > + dev_ctx->dev = dev;
> > + dev_ctx->status = MU_FREE;
> > + dev_ctx->priv = priv;
> > +
> > + priv->ctxs[i] = dev_ctx;
> > +
> > + /* Default value invalid for an header. */
> > + init_waitqueue_head(&dev_ctx->wq);
> > +
> > + INIT_LIST_HEAD(&dev_ctx->pending_out);
> > + INIT_LIST_HEAD(&dev_ctx->pending_in);
> > + sema_init(&dev_ctx->fops_lock, 1);
> > +
> > + devname = devm_kasprintf(dev, GFP_KERNEL, "%s_ch%d",
> > + info->se_name, i);
> > + if (!devname) {
> > + ret = -ENOMEM;
> > + return ret;
> > + }
> > +
> > + dev_ctx->miscdev.name = devname;
> > + dev_ctx->miscdev.minor = MISC_DYNAMIC_MINOR;
> > + dev_ctx->miscdev.fops = &se_if_fops;
> > + dev_ctx->miscdev.parent = dev;
> > + ret = misc_register(&dev_ctx->miscdev);
> > + if (ret) {
> > + dev_err(dev, "failed to register misc device %d\n",
> > + ret);
> > + return ret;
> > + }
> > +
> > + ret = devm_add_action(dev, if_misc_deregister,
> > + &dev_ctx->miscdev);
> > + if (ret) {
> > + dev_err(dev,
> > + "failed[%d] to add action to the misc-dev\n",
> > + ret);
> > + return ret;
> > + }
> > + }
> > +
> > + return ret;
> > +}
> > +
> > +static void se_load_firmware(const struct firmware *fw, void *context)
> > +{
> > + struct se_if_priv *priv = (struct se_if_priv *) context;
> > + const struct imx_se_node_info *info = priv->info;
> > + const u8 *se_fw_name = info->fw_name_in_rfs;
> > + phys_addr_t se_fw_phyaddr;
> > + u8 *se_fw_buf;
> > +
> > + if (!fw) {
> > + if (priv->fw_fail > MAX_FW_LOAD_RETRIES)
> > + dev_dbg(priv->dev,
> > + "External FW not found, using ROM FW.\n");
> > + else {
> > + /*add a bit delay to wait for firmware priv released */
> > + msleep(20);
> > +
> > + /* Load firmware one more time if timeout */
> > + request_firmware_nowait(THIS_MODULE,
> > + FW_ACTION_UEVENT, info-
> >fw_name_in_rfs,
> > + priv->dev, GFP_KERNEL, priv,
> > + se_load_firmware);
> > + priv->fw_fail++;
> > + dev_dbg(priv->dev, "Value of retries = 0x%x.\n",
> > + priv->fw_fail);
> > + }
> > +
> > + return;
> > + }
> > +
> > + /* allocate buffer to store the SE FW */
> > + se_fw_buf = dmam_alloc_coherent(priv->dev, fw->size,
> > + &se_fw_phyaddr,
> > + GFP_KERNEL);
> > + if (!se_fw_buf) {
> > + dev_err(priv->dev, "Failed to alloc SE fw buffer memory\n");
> > + goto exit;
> > + }
> > +
> > + memcpy(se_fw_buf, fw->data, fw->size);
> > +
> > + if (ele_fw_authenticate(priv->dev, se_fw_phyaddr))
> > + dev_err(priv->dev,
> > + "Failed to authenticate & load SE firmware %s.\n",
> > + se_fw_name);
> > +
> > +exit:
> > + dmam_free_coherent(priv->dev,
> > + fw->size,
> > + se_fw_buf,
> > + se_fw_phyaddr);
> > +
> > + release_firmware(fw);
> > +}
> > +
> > +static int se_if_probe(struct platform_device *pdev)
> > +{
> > + struct imx_se_node_info_list *info_list;
> > + struct device *dev = &pdev->dev;
> > + struct imx_se_node_info *info;
> > + struct se_if_priv *priv;
> > + u32 idx;
> > + int ret;
> > +
> > + if (of_property_read_u32(dev->of_node, "reg", &idx)) {
> > + ret = -EINVAL;
> > + goto exit;
> > + }
> > +
> > + info_list = (struct imx_se_node_info_list *)
> > + device_get_match_data(dev->parent);
> > + info = get_imx_se_node_info(info_list, idx);
> > +
> > + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> > + if (!priv) {
> > + ret = -ENOMEM;
> > + goto exit;
> > + }
> > +
> > + dev_set_drvdata(dev, priv);
> > +
> > + /* Mailbox client configuration */
> > + priv->se_mb_cl.dev = dev;
> > + priv->se_mb_cl.tx_block = false;
> > + priv->se_mb_cl.knows_txdone = true;
> > + priv->se_mb_cl.rx_callback = se_if_rx_callback;
> > +
> > + ret = se_if_request_channel(dev, &priv->tx_chan,
> > + &priv->se_mb_cl, info->mbox_tx_name);
> > + if (ret) {
> > + if (ret == -EPROBE_DEFER)
> > + dev_err(dev, "Mailbox tx channel, is not ready.\n");
> > + else
> > + dev_err(dev, "Failed to request tx channel\n");
> > +
> > + goto exit;
> > + }
> > +
> > + ret = se_if_request_channel(dev, &priv->rx_chan,
> > + &priv->se_mb_cl, info->mbox_rx_name);
> > + if (ret) {
> > + if (ret == -EPROBE_DEFER)
> > + dev_err(dev, "Mailbox rx channel, is not ready.\n");
> > + else
> > + dev_dbg(dev, "Failed to request rx channel\n");
> > +
> > + goto exit;
> > + }
> > +
> > + priv->dev = dev;
> > + priv->info = info;
> > +
> > + /* Initialize the mutex. */
> > + mutex_init(&priv->se_if_lock);
> > + mutex_init(&priv->se_if_cmd_lock);
> > +
> > + priv->cmd_receiver_dev = NULL;
> > + priv->waiting_rsp_dev = NULL;
> > + priv->max_dev_ctx = info->max_dev_ctx;
> > + priv->cmd_tag = info->cmd_tag;
> > + priv->rsp_tag = info->rsp_tag;
> > + priv->mem_pool_name = info->pool_name;
> > + priv->success_tag = info->success_tag;
> > + priv->base_api_ver = info->base_api_ver;
> > + priv->fw_api_ver = info->fw_api_ver;
> > +
> > + init_completion(&priv->done);
> > + spin_lock_init(&priv->lock);
> > +
> > + if (info->reserved_dma_ranges) {
> > + ret = of_reserved_mem_device_init(dev);
> > + if (ret) {
> > + dev_err(dev,
> > + "failed to init reserved memory region %d\n",
> > + ret);
> > + priv->flags &= (~RESERVED_DMA_POOL);
> > + goto exit;
> > + }
> > + priv->flags |= RESERVED_DMA_POOL;
> > + }
> > +
> > + if (info->fw_name_in_rfs) {
> > + ret = request_firmware_nowait(THIS_MODULE,
> > + FW_ACTION_UEVENT,
> > + info->fw_name_in_rfs,
> > + dev, GFP_KERNEL, priv,
> > + se_load_firmware);
> > + if (ret)
> > + dev_warn(dev, "Failed to get firmware [%s].\n",
> > + info->fw_name_in_rfs);
> > + }
> > +
> > + ret = imx_fetch_soc_info(dev);
> > + if (ret) {
> > + dev_err(dev,
> > + "failed[%d] to fetch SoC Info\n", ret);
> > + goto exit;
> > + }
> > +
> > + if (info->imem_mgmt) {
> > + /* allocate buffer where SE store encrypted IMEM */
> > + priv->imem.buf = dmam_alloc_coherent(dev,
> ELE_IMEM_SIZE,
> > + &priv->imem.phyaddr,
> > + GFP_KERNEL);
> > + if (!priv->imem.buf) {
> > + dev_err(dev,
> > + "dmam-alloc-failed: To store encr-IMEM.\n");
> > + ret = -ENOMEM;
> > + goto exit;
> > + }
> > + }
> > +
> > + if (info->max_dev_ctx) {
> > + ret = init_device_context(dev);
> > + if (ret) {
> > + dev_err(dev,
> > + "Failed[0x%x] to create device contexts.\n",
> > + ret);
> > + goto exit;
> > + }
> > + }
> > +
> > + dev_info(dev, "i.MX secure-enclave: %s interface to firmware,
> configured.\n",
> > + info->se_name);
> > + return devm_of_platform_populate(dev);
> > +
> > +exit:
> > + /* if execution control reaches here, if probe fails.
> > + * hence doing the cleanup
> > + */
> > + if (se_probe_if_cleanup(pdev))
> > + dev_err(dev,
> > + "Failed to clean-up the child node probe.\n");
> > +
> > + return ret;
> > +}
> > +
> > +static int se_probe(struct platform_device *pdev)
> > +{
> > + struct device_node *enum_dev_node;
> > + struct device *dev = &pdev->dev;
> > + int enum_count;
> > + int ret;
> > +
> > + enum_count = of_get_child_count(dev->of_node);
> > + if (!enum_count) {
> > + ret = -EINVAL;
> > + dev_err(dev, "Zero Tx/Rx path MU nodes.\n");
> > + return ret;
> > + }
> > +
> > + for_each_child_of_node(dev->of_node, enum_dev_node) {
> > + struct platform_device *enum_plat_dev __maybe_unused;
> > +
> > + if (!of_device_is_available(enum_dev_node))
> > + continue;
> > +
> > + enum_plat_dev =
> of_platform_device_create(enum_dev_node,
> > + NULL,
> > + dev);
> > + if (!enum_plat_dev) {
> > + ret = -EINVAL;
> > + of_node_put(enum_dev_node);
> > + dev_err(dev,
> > + "Failed to create enumerated platform
> device.");
> > + break;
> > + }
> > +
> > + ret = se_if_probe(enum_plat_dev);
> > + }
> > + return ret;
> > +}
> > +
> > +static int se_remove(struct platform_device *pdev)
> > +{
> > + if (se_probe_cleanup(pdev))
> > + dev_err(&pdev->dev,
> > + "i.MX Secure Enclave is not cleanly un-probed.");
> > +
> > + return 0;
> > +}
> > +
> > +static int se_suspend(struct device *dev)
> > +{
> > + struct se_if_priv *priv = dev_get_drvdata(dev);
> > + const struct imx_se_node_info *info
> > + = priv->info;
> > +
> > + if (info && info->imem_mgmt)
> > + priv->imem.size = se_save_imem_state(dev);
> > +
> > + return 0;
> > +}
> > +
> > +static int se_resume(struct device *dev)
> > +{
> > + struct se_if_priv *priv = dev_get_drvdata(dev);
> > + const struct imx_se_node_info *info
> > + = priv->info;
> > + int i;
> > +
> > + for (i = 0; i < priv->max_dev_ctx; i++)
> > + wake_up_interruptible(&priv->ctxs[i]->wq);
> > +
> > + if (info && info->imem_mgmt)
> > + se_restore_imem_state(dev);
> > +
> > + return 0;
> > +}
> > +
> > +static const struct dev_pm_ops se_pm = {
> > + RUNTIME_PM_OPS(se_suspend, se_resume, NULL)
> > +};
> > +
> > +static struct platform_driver se_driver = {
> > + .driver = {
> > + .name = "fsl-se-fw",
> > + .of_match_table = se_match,
> > + .pm = &se_pm,
> > + },
> > + .probe = se_probe,
> > + .remove = se_remove,
> > +};
> > +MODULE_DEVICE_TABLE(of, se_match);
> > +
> > +module_platform_driver(se_driver);
> > +
> > +MODULE_AUTHOR("Pankaj Gupta <pankaj.gupta@....com>");
> > +MODULE_DESCRIPTION("iMX Secure Enclave Driver.");
> > +MODULE_LICENSE("GPL");
> > diff --git a/drivers/firmware/imx/se_ctrl.h b/drivers/firmware/imx/se_ctrl.h
> > new file mode 100644
> > index 000000000000..76e1ce77c52f
> > --- /dev/null
> > +++ b/drivers/firmware/imx/se_ctrl.h
> > @@ -0,0 +1,151 @@
> > +/* SPDX-License-Identifier: GPL-2.0+ */
> > +/*
> > + * Copyright 2024 NXP
> > + */
> > +
> > +#ifndef SE_MU_H
> > +#define SE_MU_H
> > +
> > +#include <linux/miscdevice.h>
> > +#include <linux/semaphore.h>
> > +#include <linux/mailbox_client.h>
> > +
> > +#define MAX_FW_LOAD_RETRIES 50
> > +
> > +#define MSG_TAG(x) (((x) & 0xff000000) >> 24)
> > +#define MSG_COMMAND(x) (((x) & 0x00ff0000) >> 16)
> > +#define MSG_SIZE(x) (((x) & 0x0000ff00) >> 8)
> > +#define MSG_VER(x) ((x) & 0x000000ff)
> > +#define RES_STATUS(x) ((x) & 0x000000ff)
> > +#define MAX_DATA_SIZE_PER_USER (65 * 1024)
> > +#define S4_DEFAULT_MUAP_INDEX (2)
> > +#define S4_MUAP_DEFAULT_MAX_USERS (4)
> > +#define MESSAGING_VERSION_6 0x6
> > +#define MESSAGING_VERSION_7 0x7
> > +
> > +#define DEFAULT_MESSAGING_TAG_COMMAND (0x17u)
> > +#define DEFAULT_MESSAGING_TAG_RESPONSE (0xe1u)
> > +
> > +#define SE_MU_IO_FLAGS_USE_SEC_MEM (0x02u)
> > +#define SE_MU_IO_FLAGS_USE_SHORT_ADDR (0x04u)
> > +
> > +struct se_imem_buf {
> > + u8 *buf;
> > + phys_addr_t phyaddr;
> > + u32 size;
> > +};
> > +
> > +struct se_buf_desc {
> > + u8 *shared_buf_ptr;
> > + u8 *usr_buf_ptr;
> > + u32 size;
> > + struct list_head link;
> > +};
> > +
> > +/* Status of a char device */
> > +enum se_if_dev_ctx_status_t {
> > + MU_FREE,
> > + MU_OPENED
> > +};
> > +
> > +struct se_shared_mem {
> > + dma_addr_t dma_addr;
> > + u32 size;
> > + u32 pos;
> > + u8 *ptr;
> > +};
> > +
> > +/* Private struct for each char device instance. */
> > +struct se_if_device_ctx {
> > + struct device *dev;
> > + struct se_if_priv *priv;
> > + struct miscdevice miscdev;
> > +
> > + enum se_if_dev_ctx_status_t status;
> > + wait_queue_head_t wq;
> > + struct semaphore fops_lock;
> > +
> > + u32 pending_hdr;
> > + struct list_head pending_in;
> > + struct list_head pending_out;
> > +
> > + struct se_shared_mem secure_mem;
> > + struct se_shared_mem non_secure_mem;
> > +
> > + u32 *temp_resp;
> > + u32 temp_resp_size;
> > + struct notifier_block se_notify;
> > +};
> > +
> > +/* Header of the messages exchange with the EdgeLock Enclave */
> > +struct se_msg_hdr {
> > + u8 ver;
> > + u8 size;
> > + u8 command;
> > + u8 tag;
> > +} __packed;
> > +
> > +#define SE_MU_HDR_SZ 4
> > +#define TAG_OFFSET (SE_MU_HDR_SZ - 1)
> > +#define CMD_OFFSET (SE_MU_HDR_SZ - 2)
> > +#define SZ_OFFSET (SE_MU_HDR_SZ - 3)
> > +#define VER_OFFSET (SE_MU_HDR_SZ - 4)
> > +
> > +struct se_api_msg {
> > + u32 header; /* u8 Tag; u8 Command; u8 Size; u8 Ver; */
> > + u32 *data;
> > +};
> > +
> > +struct se_if_priv {
> > + struct se_if_device_ctx *cmd_receiver_dev;
> > + struct se_if_device_ctx *waiting_rsp_dev;
> > + bool no_dev_ctx_used;
> > + /*
> > + * prevent parallel access to the se interface registers
> > + * e.g. a user trying to send a command while the other one is
> > + * sending a response.
> > + */
> > + struct mutex se_if_lock;
> > + /*
> > + * prevent a command to be sent on the se interface while another
> one is
> > + * still processing. (response to a command is allowed)
> > + */
> > + struct mutex se_if_cmd_lock;
> > + struct device *dev;
> > + u8 *mem_pool_name;
> > + u8 cmd_tag;
> > + u8 rsp_tag;
> > + u8 success_tag;
> > + u8 base_api_ver;
> > + u8 fw_api_ver;
> > + u32 fw_fail;
> > + const void *info;
> > +
> > + struct mbox_client se_mb_cl;
> > + struct mbox_chan *tx_chan, *rx_chan;
> > + struct se_api_msg *rx_msg;
> > + struct completion done;
> > + spinlock_t lock;
> > + /*
> > + * Flag to retain the state of initialization done at
> > + * the time of se-mu probe.
> > + */
> > + uint32_t flags;
> > + u8 max_dev_ctx;
> > + struct se_if_device_ctx **ctxs;
> > + struct se_imem_buf imem;
> > +};
> > +
> > +void *get_phy_buf_mem_pool(struct device *dev,
> > + u8 *mem_pool_name,
> > + dma_addr_t *buf,
> > + u32 size);
> > +phys_addr_t get_phy_buf_mem_pool1(struct device *dev,
> > + u8 *mem_pool_name,
> > + u32 **buf,
> > + u32 size);
> > +void free_phybuf_mem_pool(struct device *dev,
> > + u8 *mem_pool_name,
> > + u32 *buf,
> > + u32 size);
> > +#endif
> > diff --git a/include/linux/firmware/imx/se_api.h
> b/include/linux/firmware/imx/se_api.h
> > new file mode 100644
> > index 000000000000..c47f84906837
> > --- /dev/null
> > +++ b/include/linux/firmware/imx/se_api.h
> > @@ -0,0 +1,14 @@
> > +/* SPDX-License-Identifier: GPL-2.0+ */
> > +/*
> > + * Copyright 2024 NXP
> > + */
> > +
> > +#ifndef __SE_API_H__
> > +#define __SE_API_H__
> > +
> > +#include <linux/types.h>
> > +
> > +#define SOC_ID_OF_IMX8ULP 0x084D
> > +#define SOC_ID_OF_IMX93 0x9300
> > +
> > +#endif /* __SE_API_H__ */
> > diff --git a/include/uapi/linux/se_ioctl.h b/include/uapi/linux/se_ioctl.h
> > new file mode 100644
> > index 000000000000..f68a36e9da2c
> > --- /dev/null
> > +++ b/include/uapi/linux/se_ioctl.h
> > @@ -0,0 +1,88 @@
> > +/* SPDX-License-Identifier: (GPL-2.0 WITH Linux-syscall-note) OR BSD-3-
> Clause*/
> > +/*
> > + * Copyright 2024 NXP
> > + */
> > +
> > +#ifndef SE_IOCTL_H
> > +#define SE_IOCTL_H
> > +
> > +/* IOCTL definitions. */
> > +
> > +struct se_ioctl_setup_iobuf {
> > + u8 *user_buf;
> > + u32 length;
> > + u32 flags;
> > + u64 ele_addr;
> > +};
> > +
> > +struct se_ioctl_shared_mem_cfg {
> > + u32 base_offset;
> > + u32 size;
> > +};
> > +
> > +struct se_ioctl_get_if_info {
> > + u8 se_if_id;
> > + u8 interrupt_idx;
> > + u8 tz;
> > + u8 did;
> > + u8 cmd_tag;
> > + u8 rsp_tag;
> > + u8 success_tag;
> > + u8 base_api_ver;
> > + u8 fw_api_ver;
> > +};
> > +
> > +struct se_ioctl_signed_message {
> > + u8 *message;
> > + u32 msg_size;
> > + u32 error_code;
> > +};
> > +
> > +struct se_ioctl_get_soc_info {
> > + u16 soc_id;
> > + u16 soc_rev;
> > +};
> > +
> > +/* IO Buffer Flags */
> > +#define SE_IO_BUF_FLAGS_IS_OUTPUT (0x00u)
> > +#define SE_IO_BUF_FLAGS_IS_INPUT (0x01u)
> > +#define SE_IO_BUF_FLAGS_USE_SEC_MEM (0x02u)
> > +#define SE_IO_BUF_FLAGS_USE_SHORT_ADDR (0x04u)
> > +#define SE_IO_BUF_FLAGS_IS_IN_OUT (0x10u)
> > +
> > +/* IOCTLS */
> > +#define SE_IOCTL 0x0A /* like MISC_MAJOR. */
> > +
> > +/*
> > + * ioctl to designated the current fd as logical-reciever.
> > + * This is ioctl is send when the nvm-daemon, a slave to the
> > + * firmware is started by the user.
> > + */
> > +#define SE_IOCTL_ENABLE_CMD_RCV _IO(SE_IOCTL, 0x01)
> > +
> > +/*
> > + * ioctl to get the buffer allocated from the memory, which is shared
> > + * between kernel and FW.
> > + * Post allocation, the kernel tagged the allocated memory with:
> > + * Output
> > + * Input
> > + * Input-Output
> > + * Short address
> > + * Secure-memory
> > + */
> > +#define SE_IOCTL_SETUP_IOBUF _IOWR(SE_IOCTL, 0x03, \
> > + struct se_ioctl_setup_iobuf)
> > +
> > +/*
> > + * ioctl to get the mu information, that is used to exchange message
> > + * with FW, from user-spaced.
> > + */
> > +#define SE_IOCTL_GET_MU_INFO _IOR(SE_IOCTL, 0x04, \
> > + struct se_ioctl_get_if_info)
> > +/*
> > + * ioctl to get SoC Info from user-space.
> > + */
> > +#define SE_IOCTL_GET_SOC_INFO _IOR(SE_IOCTL, 0x06, \
> > + struct se_ioctl_get_soc_info)
> > +
> > +#endif
> >
> > --
> > 2.34.1
> >
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