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Message-ID: <Z+QePoixgnheYQTW@lizhi-Precision-Tower-5810>
Date: Wed, 26 Mar 2025 11:33:18 -0400
From: Frank Li <Frank.li@....com>
To: Pankaj Gupta <pankaj.gupta@....com>
Cc: Jonathan Corbet <corbet@....net>, Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
Sascha Hauer <s.hauer@...gutronix.de>,
Pengutronix Kernel Team <kernel@...gutronix.de>,
Fabio Estevam <festevam@...il.com>, 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 v14 4/6] firmware: imx: add driver for NXP EdgeLock
Enclave
On Thu, Mar 27, 2025 at 12:08:00AM +0530, Pankaj Gupta wrote:
> Add driver for enabling MU based communication interface to secure-enclave.
>
> 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 with Linux over single or multiple
> dedicated messaging unit(MU) based interface(s).
> Exists on i.MX SoC(s) like i.MX8ULP, i.MX93, i.MX95 etc.
>
> Other dependent kernel drivers will be:
> - NVMEM: that supports non-volatile devices like EFUSES,
> managed by NXP's secure-enclave.
>
> Signed-off-by: Pankaj Gupta <pankaj.gupta@....com>
Much better than before. See below comments.
Frank
> ---
> changes from v13 to v14
> - trimmed the ele_fetch_soc_info.
> - removed the function ptr "se_info->se_fetch_soc_info" and replaced with ele_fetch_soc_info.
> - moved definition of func se_load_firmware, to 6/6 patch.
> - Different SoC, different ways to fetch soc_info. Generic function declaration for ele_fetch_soc_info() is needed. Hence wrapping ele_get_info() in it.
> - Updated Kconfig help text for assertive tone.
> - func ele_debug_dump is updated, to remove constructing the format string.
> - removed the macro usage for SOC_ID_MASK.
> - used low case hex number.
> - Condition will never occur, where msg_len satisfy the following condition "msg_len % 4 != 0". Err msg is added if it occurs.
> - Function description is added to se_add_msg_crc.
> - timeout is added to function ele_msg_rcv, in 5/5 patch.
> - local variable "header" is initialized with "tx_msg" and replaced "return err" with "return tx_msg_sz" in func ele_msg_send().
> - replace function name from "exception_for_size" to "check_hdr_exception_for_sz"
> - replaced "return ret > 0 ? 0 : -1;" with "return ret > 0 ? 0 : ret;" in func "se_save_imem_state".
> - func "se_restore_imem_state", to return if the condition is false to proceed.
> - removed casting by (void *).
> - removed devm_kasprintf and done direct allocatiion for attr->soc_id = "i.MX8ULP" & attr->soc_id = "i.MX8ULP", & attr->family.
> - Followed Reverse christmas tree order, whereever missing.
> - There is no return if ele_fw_authenticate fails. Execution flow continue forward and execute the fucn dma_free_coherent().
> - The loop is not for retry. The loop is needed to load secondary fw followed by loading primary fw, first. This is the case when ELE also got reset.
> - dev_err_probe is corrected in func "se_if_request_channel".
> ---
> drivers/firmware/imx/Kconfig | 13 ++
> drivers/firmware/imx/Makefile | 2 +
> drivers/firmware/imx/ele_base_msg.c | 315 ++++++++++++++++++++++++++++
> drivers/firmware/imx/ele_base_msg.h | 95 +++++++++
> drivers/firmware/imx/ele_common.c | 343 ++++++++++++++++++++++++++++++
> drivers/firmware/imx/ele_common.h | 50 +++++
> drivers/firmware/imx/se_ctrl.c | 402 ++++++++++++++++++++++++++++++++++++
> drivers/firmware/imx/se_ctrl.h | 84 ++++++++
> include/linux/firmware/imx/se_api.h | 14 ++
> 9 files changed, 1318 insertions(+)
>
> diff --git a/drivers/firmware/imx/Kconfig b/drivers/firmware/imx/Kconfig
> index c964f4924359..f76ad32aad59 100644
> --- a/drivers/firmware/imx/Kconfig
> +++ b/drivers/firmware/imx/Kconfig
> @@ -33,3 +33,16 @@ config IMX_SCMI_MISC_DRV
> core that could provide misc functions such as board control.
>
> This driver can also be built as a module.
> +
> +config IMX_SEC_ENCLAVE
> + tristate "i.MX Embedded Secure Enclave - EdgeLock Enclave Firmware driver."
> + depends on IMX_MBOX && ARCH_MXC && ARM64
> + select FW_LOADER
> + default m if ARCH_MXC
> +
> + help
> + Exposes APIs supported 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 8d046c341be8..4e1d2706535d 100644
> --- a/drivers/firmware/imx/Makefile
> +++ b/drivers/firmware/imx/Makefile
> @@ -2,3 +2,5 @@
> 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
> obj-${CONFIG_IMX_SCMI_MISC_DRV} += sm-misc.o
> +sec_enclave-objs = se_ctrl.o ele_common.o ele_base_msg.o
> +obj-${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..3839c93f8212
> --- /dev/null
> +++ b/drivers/firmware/imx/ele_base_msg.c
> @@ -0,0 +1,315 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright 2025 NXP
> + */
> +
> +#include <linux/types.h>
> +
> +#include <linux/completion.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/genalloc.h>
> +
> +#include "ele_base_msg.h"
> +#include "ele_common.h"
> +
> +#define FW_DBG_DUMP_FIXED_STR "ELE"
> +
> +int ele_get_info(struct se_if_priv *priv, struct ele_dev_info *s_info)
> +{
> + struct se_api_msg *tx_msg __free(kfree) = NULL;
> + struct se_api_msg *rx_msg __free(kfree) = NULL;
> + dma_addr_t get_info_addr = 0;
> + u32 *get_info_data = NULL;
> + int ret = 0;
> +
> + if (!priv)
> + return -EINVAL;
> +
> + memset(s_info, 0x0, sizeof(*s_info));
> +
> + tx_msg = kzalloc(ELE_GET_INFO_REQ_MSG_SZ, GFP_KERNEL);
> + if (!tx_msg)
> + return -ENOMEM;
> +
> + rx_msg = kzalloc(ELE_GET_INFO_RSP_MSG_SZ, GFP_KERNEL);
> + if (!rx_msg)
> + return -ENOMEM;
> +
> + if (priv->mem_pool)
> + get_info_data = gen_pool_dma_alloc(priv->mem_pool,
> + ELE_GET_INFO_BUFF_SZ,
> + &get_info_addr);
> + else
> + get_info_data = dma_alloc_coherent(priv->dev,
> + ELE_GET_INFO_BUFF_SZ,
> + &get_info_addr,
> + GFP_KERNEL);
> + if (!get_info_data) {
> + dev_dbg(priv->dev,
> + "%s: Failed to allocate get_info_addr.\n",
> + __func__);
> + return -ENOMEM;
> + }
> +
> + ret = se_fill_cmd_msg_hdr(priv,
> + (struct se_msg_hdr *)&tx_msg->header,
> + ELE_GET_INFO_REQ,
> + ELE_GET_INFO_REQ_MSG_SZ,
> + true);
> + if (ret)
> + goto exit;
> +
> + tx_msg->data[0] = upper_32_bits(get_info_addr);
> + tx_msg->data[1] = lower_32_bits(get_info_addr);
> + tx_msg->data[2] = sizeof(*s_info);
> + ret = ele_msg_send_rcv(priv,
> + tx_msg,
> + ELE_GET_INFO_REQ_MSG_SZ,
> + rx_msg,
> + ELE_GET_INFO_RSP_MSG_SZ);
Can you efficiently use 80/100 char width
ret = ele_msg_send_rcv(priv,
tx_msg, ELE_GET_INFO_REQ_MSG_SZ,
rx_msg, ELE_GET_INFO_RSP_MSG_SZ);
This is small fine tuning.
> + if (ret < 0)
> + goto exit;
> +
> + ret = se_val_rsp_hdr_n_status(priv,
> + rx_msg,
> + ELE_GET_INFO_REQ,
> + ELE_GET_INFO_RSP_MSG_SZ,
> + true);
> +
> + memcpy(s_info, get_info_data, sizeof(*s_info));
> +
> +exit:
> + if (priv->mem_pool)
> + gen_pool_free(priv->mem_pool,
> + (u64)get_info_data,
> + ELE_GET_INFO_BUFF_SZ);
> + else
> + dma_free_coherent(priv->dev,
> + ELE_GET_INFO_BUFF_SZ,
> + get_info_data,
> + get_info_addr);
> +
> + return ret;
> +}
> +
> +int ele_fetch_soc_info(struct se_if_priv *priv, void *data)
> +{
> + return ele_get_info(priv, data);
> +}
> +
> +int ele_ping(struct se_if_priv *priv)
> +{
> + struct se_api_msg *tx_msg __free(kfree) = NULL;
> + struct se_api_msg *rx_msg __free(kfree) = NULL;
> + int ret = 0;
> +
> + if (!priv)
> + return -EINVAL;
> +
> + tx_msg = kzalloc(ELE_PING_REQ_SZ, GFP_KERNEL);
> + if (!tx_msg)
> + return -ENOMEM;
> +
> + rx_msg = kzalloc(ELE_PING_RSP_SZ, GFP_KERNEL);
> + if (!rx_msg)
> + return -ENOMEM;
> +
> + ret = se_fill_cmd_msg_hdr(priv,
> + (struct se_msg_hdr *)&tx_msg->header,
> + ELE_PING_REQ, ELE_PING_REQ_SZ, true);
> + if (ret) {
> + dev_err(priv->dev, "Error: se_fill_cmd_msg_hdr failed.\n");
> + return ret;
> + }
> +
> + ret = ele_msg_send_rcv(priv,
> + tx_msg,
> + ELE_PING_REQ_SZ,
> + rx_msg,
> + ELE_PING_RSP_SZ);
> + if (ret < 0)
> + return ret;
> +
> + ret = se_val_rsp_hdr_n_status(priv,
> + rx_msg,
> + ELE_PING_REQ,
> + ELE_PING_RSP_SZ,
> + true);
> +
> + return ret;
> +}
> +
> +int ele_service_swap(struct se_if_priv *priv,
> + phys_addr_t addr,
> + u32 addr_size, u16 flag)
> +{
> + struct se_api_msg *tx_msg __free(kfree) = NULL;
> + struct se_api_msg *rx_msg __free(kfree) = NULL;
> + int ret = 0;
> +
> + if (!priv)
> + return -EINVAL;
> +
> + tx_msg = kzalloc(ELE_SERVICE_SWAP_REQ_MSG_SZ, GFP_KERNEL);
> + if (!tx_msg)
> + return -ENOMEM;
> +
> + rx_msg = kzalloc(ELE_SERVICE_SWAP_RSP_MSG_SZ, GFP_KERNEL);
> + if (!rx_msg)
> + return -ENOMEM;
> +
> + ret = se_fill_cmd_msg_hdr(priv,
> + (struct se_msg_hdr *)&tx_msg->header,
> + ELE_SERVICE_SWAP_REQ,
> + ELE_SERVICE_SWAP_REQ_MSG_SZ, true);
> + if (ret)
> + return ret;
> +
> + tx_msg->data[0] = flag;
> + tx_msg->data[1] = addr_size;
> + tx_msg->data[2] = ELE_NONE_VAL;
> + tx_msg->data[3] = lower_32_bits(addr);
> + tx_msg->data[4] = se_add_msg_chksum((uint32_t *)&tx_msg[0],
> + ELE_SERVICE_SWAP_REQ_MSG_SZ);
> + if (!tx_msg->data[4])
> + return -EINVAL;
> +
> + ret = ele_msg_send_rcv(priv,
> + tx_msg,
> + ELE_SERVICE_SWAP_REQ_MSG_SZ,
> + rx_msg,
> + ELE_SERVICE_SWAP_RSP_MSG_SZ);
> + if (ret < 0)
> + return ret;
> +
> + ret = se_val_rsp_hdr_n_status(priv,
> + rx_msg,
> + ELE_SERVICE_SWAP_REQ,
> + ELE_SERVICE_SWAP_RSP_MSG_SZ,
> + true);
> + if (ret)
> + return ret;
> +
> + if (flag == ELE_IMEM_EXPORT)
> + ret = rx_msg->data[1];
> + else
> + ret = 0;
> +
> + return ret;
> +}
> +
> +int ele_fw_authenticate(struct se_if_priv *priv, phys_addr_t addr)
> +{
> + struct se_api_msg *tx_msg __free(kfree) = NULL;
> + struct se_api_msg *rx_msg __free(kfree) = NULL;
> + int ret = 0;
> +
> + if (!priv)
> + return -EINVAL;
> +
> + tx_msg = kzalloc(ELE_FW_AUTH_REQ_SZ, GFP_KERNEL);
> + if (!tx_msg)
> + return -ENOMEM;
> +
> + rx_msg = kzalloc(ELE_FW_AUTH_RSP_MSG_SZ, GFP_KERNEL);
> + if (!rx_msg)
> + return -ENOMEM;
> +
> + ret = se_fill_cmd_msg_hdr(priv,
> + (struct se_msg_hdr *)&tx_msg->header,
> + ELE_FW_AUTH_REQ,
> + ELE_FW_AUTH_REQ_SZ,
> + true);
> + if (ret)
> + return ret;
> +
> + tx_msg->data[1] = upper_32_bits(addr);
> + tx_msg->data[0] = lower_32_bits(addr);
> + tx_msg->data[2] = addr;
> +
> + ret = ele_msg_send_rcv(priv,
> + tx_msg,
> + ELE_FW_AUTH_REQ_SZ,
> + rx_msg,
> + ELE_FW_AUTH_RSP_MSG_SZ);
> + if (ret < 0)
> + return ret;
> +
> + ret = se_val_rsp_hdr_n_status(priv,
> + rx_msg,
> + ELE_FW_AUTH_REQ,
> + ELE_FW_AUTH_RSP_MSG_SZ,
> + true);
> + return ret;
> +}
> +
> +int ele_debug_dump(struct se_if_priv *priv)
> +{
> + struct se_api_msg *tx_msg __free(kfree) = NULL;
> + struct se_api_msg *rx_msg __free(kfree) = NULL;
> + bool keep_logging;
> + int msg_ex_cnt;
> + int ret = 0;
> + int i;
> +
> + if (!priv)
> + return -EINVAL;
> +
> + tx_msg = kzalloc(ELE_DEBUG_DUMP_REQ_SZ, GFP_KERNEL);
> + if (!tx_msg)
> + return -ENOMEM;
> +
> + rx_msg = kzalloc(ELE_DEBUG_DUMP_RSP_SZ, GFP_KERNEL);
> + if (!rx_msg)
> + return -ENOMEM;
> +
> + ret = se_fill_cmd_msg_hdr(priv,
> + &tx_msg->header,
> + ELE_DEBUG_DUMP_REQ,
> + ELE_DEBUG_DUMP_REQ_SZ,
> + true);
> + if (ret)
> + return ret;
> +
> + msg_ex_cnt = 0;
> + do {
> + memset(rx_msg, 0x0, ELE_DEBUG_DUMP_RSP_SZ);
> +
> + ret = ele_msg_send_rcv(priv,
> + tx_msg,
> + ELE_DEBUG_DUMP_REQ_SZ,
> + rx_msg,
> + ELE_DEBUG_DUMP_RSP_SZ);
> + if (ret < 0)
> + return ret;
> +
> + ret = se_val_rsp_hdr_n_status(priv,
> + rx_msg,
> + ELE_DEBUG_DUMP_REQ,
> + ELE_DEBUG_DUMP_RSP_SZ,
> + true);
> + if (!ret) {
Generally, error handle here,
if (ret) {
dev_err(priv->dev, "Dump_Debug_Buffer Error: %x.", ret);
break;
}
keep_logging ...
> + keep_logging = (rx_msg->header.size < (ELE_DEBUG_DUMP_RSP_SZ >> 2)) ?
> + false : true;
> + keep_logging = keep_logging ?
> + (msg_ex_cnt > ELE_MAX_DBG_DMP_PKT ? false : true) :
> + false;
can you combine to one
keep_logging = rx_msg->header.size >= (ELE_DEBUG_DUMP_RSP_SZ >> 2)
&& msg_ex_cnt <= ELE_MAX_DBG_DMP_PKT;
> +
> + rx_msg->header.size -= 2;
> +
> + if (rx_msg->header.size > 4)
> + rx_msg->header.size--;
> +
> + for (i = 0; i < rx_msg->header.size; i += 2)
> + dev_info(priv->dev, "%s%02x_%02x: 0x%08x 0x%08x",
> + FW_DBG_DUMP_FIXED_STR, msg_ex_cnt, i,
> + rx_msg->data[i + 1], rx_msg->data[i + 2]);
According to common sense, most likely it is rx_msg->data[i + 0], rx_msg->data[i + 1].
rx_msg->data[0] have special means?
> + } else {
> + dev_err(priv->dev, "Dump_Debug_Buffer Error: %x.", ret);
> + break;
> + }
> + msg_ex_cnt++;
> + } while (keep_logging);
> +
> + 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..c037a9cfa24c
> --- /dev/null
> +++ b/drivers/firmware/imx/ele_base_msg.h
> @@ -0,0 +1,95 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * Copyright 2025 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>
> +
> +#include "se_ctrl.h"
> +
> +#define ELE_NONE_VAL 0x0
> +
> +#define ELE_GET_INFO_REQ 0xda
> +#define ELE_GET_INFO_REQ_MSG_SZ 0x10
> +#define ELE_GET_INFO_RSP_MSG_SZ 0x08
> +
> +#define MAX_UID_SIZE (16)
> +#define DEV_GETINFO_ROM_PATCH_SHA_SZ (32)
> +#define DEV_GETINFO_FW_SHA_SZ (32)
> +#define DEV_GETINFO_OEM_SRKH_SZ (64)
> +#define DEV_GETINFO_MIN_VER_MASK 0xff
> +#define DEV_GETINFO_MAJ_VER_MASK 0xff00
> +#define ELE_DEV_INFO_EXTRA_SZ 0x60
> +
> +struct dev_info {
> + u8 cmd;
> + u8 ver;
> + u16 length;
> + u16 soc_id;
> + u16 soc_rev;
> + u16 lmda_val;
> + u8 ssm_state;
> + u8 dev_atts_api_ver;
> + u8 uid[MAX_UID_SIZE];
> + u8 sha_rom_patch[DEV_GETINFO_ROM_PATCH_SHA_SZ];
> + u8 sha_fw[DEV_GETINFO_FW_SHA_SZ];
> +};
> +
> +struct dev_addn_info {
> + u8 oem_srkh[DEV_GETINFO_OEM_SRKH_SZ];
> + u8 trng_state;
> + u8 csal_state;
> + u8 imem_state;
> + u8 reserved2;
> +};
> +
> +struct ele_dev_info {
> + struct dev_info d_info;
> + struct dev_addn_info d_addn_info;
> +};
> +
> +#define ELE_GET_INFO_BUFF_SZ (sizeof(struct ele_dev_info) \
> + + ELE_DEV_INFO_EXTRA_SZ)
> +
> +#define GET_SERIAL_NUM_FROM_UID(x, uid_word_sz) \
> + (((u64)(((u32 *)(x))[(uid_word_sz) - 1]) << 32) | ((u32 *)(x))[0])
> +
> +#define ELE_MAX_DBG_DMP_PKT 50
> +#define ELE_DEBUG_DUMP_REQ 0x21
> +#define ELE_DEBUG_DUMP_REQ_SZ 0x4
> +#define ELE_DEBUG_DUMP_RSP_SZ 0x5c
> +
> +#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 se_if_priv *priv, struct ele_dev_info *s_info);
> +int ele_fetch_soc_info(struct se_if_priv *priv, void *data);
> +int ele_ping(struct se_if_priv *priv);
> +int ele_service_swap(struct se_if_priv *priv,
> + phys_addr_t addr,
> + u32 addr_size, u16 flag);
> +int ele_fw_authenticate(struct se_if_priv *priv, phys_addr_t addr);
> +int ele_debug_dump(struct se_if_priv *priv);
> +#endif
> diff --git a/drivers/firmware/imx/ele_common.c b/drivers/firmware/imx/ele_common.c
> new file mode 100644
> index 000000000000..be4dabeeb64c
> --- /dev/null
> +++ b/drivers/firmware/imx/ele_common.c
> @@ -0,0 +1,343 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright 2025 NXP
> + */
> +
> +#include "ele_base_msg.h"
> +#include "ele_common.h"
> +
> +/*
> + * se_add_msg_chksum() - to calculate checksum word by word.
> + *
> + * @msg : reference to the input msg-data.
> + * @msg_len : reference to the input msg-data length in bytes.
> + *
> + * This function returns the checksum calculated by ORing word by word.
> + *
> + * Return:
> + * 0: if the input length is not 4 byte aligned, or num of words < 5.
> + * chksum: calculated word by word.
> + */
> +u32 se_add_msg_chksum(u32 *msg, u32 msg_len)
> +{
> + u32 nb_words = msg_len / (u32)sizeof(u32);
> + u32 chksum = 0;
> + u32 i;
> +
> + if (nb_words < 5)
> + return chksum;
> +
> + if (msg_len % SE_MSG_WORD_SZ) {
> + pr_err("Msg-len is not 4-byte aligned.");
> + return chksum;
> + }
> +
> + for (i = 0; i < nb_words - 1; i++)
> + chksum ^= *(msg + i);
if msg_len is 8, nv_words is 2,
Only first *(msg + 0) is calcucate, is it what your expected? If yes,
need comments said why *(msg + 1) needn't calcuate.
> +
> + return chksum;
> +}
> +
> +int ele_msg_rcv(struct se_if_priv *priv,
> + struct se_clbk_handle *se_clbk_hdl)
> +{
> + int err = 0;
> +
> + do {
> + err = wait_for_completion_interruptible(&se_clbk_hdl->done);
> + if (err == -ERESTARTSYS) {
> + if (priv->waiting_rsp_clbk_hdl.rx_msg) {
> + priv->waiting_rsp_clbk_hdl.signal_rcvd = true;
> + continue;
Is possible dead loop here?
> + }
> + dev_err(priv->dev,
> + "Err[0x%x]:Interrupted by signal.\n", err);
> + err = -EINTR;
> + break;
> + }
> + } while (err != 0);
> +
> + return err ? err : se_clbk_hdl->rx_msg_sz;
> +}
> +
> +int ele_msg_send(struct se_if_priv *priv,
> + void *tx_msg,
> + int tx_msg_sz)
> +{
> + struct se_msg_hdr *header = tx_msg;
> + int err;
> +
> + /*
> + * Check that the size passed as argument matches the size
> + * carried in the message.
> + */
> + if (header->size << 2 != tx_msg_sz) {
> + dev_err(priv->dev,
> + "User buf hdr: 0x%x, sz mismatced with input-sz (%d != %d).",
> + *(u32 *)header,
> + header->size << 2, tx_msg_sz);
> + return -EINVAL;
> + }
> +
> + err = mbox_send_message(priv->tx_chan, tx_msg);
> + if (err < 0) {
> + dev_err(priv->dev, "Error: mbox_send_message failure.\n");
> + return err;
> + }
> +
> + return tx_msg_sz;
> +}
> +
> +/* API used for send/receive blocking call. */
> +int ele_msg_send_rcv(struct se_if_priv *priv,
> + void *tx_msg,
> + int tx_msg_sz,
> + void *rx_msg,
> + int exp_rx_msg_sz)
> +{
> + int err;
> +
> + guard(mutex)(&priv->se_if_cmd_lock);
> +
> + priv->waiting_rsp_clbk_hdl.rx_msg_sz = exp_rx_msg_sz;
> + priv->waiting_rsp_clbk_hdl.rx_msg = rx_msg;
> +
> + err = ele_msg_send(priv, tx_msg, tx_msg_sz);
> + if (err < 0)
> + return err;
> +
> + err = ele_msg_rcv(priv, &priv->waiting_rsp_clbk_hdl);
> +
> + if (priv->waiting_rsp_clbk_hdl.signal_rcvd) {
> + err = -EINTR;
> + priv->waiting_rsp_clbk_hdl.signal_rcvd = false;
> + dev_err(priv->dev,
> + "Err[0x%x]:Interrupted by signal.\n", err);
> + }
> +
> + return err;
> +}
> +
> +static bool check_hdr_exception_for_sz(struct se_if_priv *priv,
> + struct se_msg_hdr *header)
> +{
> + /* List of API(s) header that can be accepte variable length
> + * response buffer.
> + */
> + if (header->command == ELE_DEBUG_DUMP_REQ &&
> + header->ver == priv->if_defs->base_api_ver &&
> + header->size >= 0 &&
> + header->size <= ELE_DEBUG_DUMP_RSP_SZ)
> + return true;
> +
> + return false;
> +}
> +
> +/*
> + * Callback called by mailbox FW, when data is received.
> + */
> +void se_if_rx_callback(struct mbox_client *mbox_cl, void *msg)
> +{
> + struct se_clbk_handle *se_clbk_hdl;
> + struct device *dev = mbox_cl->dev;
> + struct se_msg_hdr *header;
> + struct se_if_priv *priv;
> + u32 rx_msg_sz;
> +
> + priv = dev_get_drvdata(dev);
> +
> + /* The function can be called with NULL msg */
> + if (!msg) {
> + dev_err(dev, "Message is invalid\n");
> + return;
> + }
> +
> + header = msg;
> + rx_msg_sz = header->size << 2;
> +
> + /* Incoming command: wake up the receiver if any. */
> + if (header->tag == priv->if_defs->cmd_tag) {
> + se_clbk_hdl = &priv->cmd_receiver_clbk_hdl;
> + dev_dbg(dev,
> + "Selecting cmd receiver for mesg header:0x%x.",
> + *(u32 *)header);
> +
> + /* Pre-allocated buffer of MAX_NVM_MSG_LEN
> + * as the NVM command are initiated by FW.
> + * Size is revealed as part of this call function.
> + */
> + if (rx_msg_sz > MAX_NVM_MSG_LEN) {
> + dev_err(dev,
> + "CMD-RCVER NVM: hdr(0x%x) with different sz(%d != %d).\n",
> + *(u32 *)header,
> + rx_msg_sz, se_clbk_hdl->rx_msg_sz);
> +
> + se_clbk_hdl->rx_msg_sz = MAX_NVM_MSG_LEN;
> + }
> + se_clbk_hdl->rx_msg_sz = rx_msg_sz;
> +
> + } else if (header->tag == priv->if_defs->rsp_tag) {
> + se_clbk_hdl = &priv->waiting_rsp_clbk_hdl;
> + dev_dbg(dev,
> + "Selecting resp waiter for mesg header:0x%x.",
> + *(u32 *)header);
> +
> + if (rx_msg_sz != se_clbk_hdl->rx_msg_sz &&
> + check_hdr_exception_for_sz(priv, header)) {
> + dev_err(dev,
> + "Rsp to CMD: hdr(0x%x) with different sz(%d != %d).\n",
> + *(u32 *)header,
> + rx_msg_sz, se_clbk_hdl->rx_msg_sz);
> +
> + se_clbk_hdl->rx_msg_sz = min(rx_msg_sz, se_clbk_hdl->rx_msg_sz);
> + }
> + } else {
> + dev_err(dev, "Failed to select a device for message: %.8x\n",
> + *((u32 *)header));
> + return;
> + }
> +
> + memcpy(se_clbk_hdl->rx_msg, msg, se_clbk_hdl->rx_msg_sz);
> +
> + /* Allow user to read */
> + complete(&se_clbk_hdl->done);
> +}
> +
> +int se_val_rsp_hdr_n_status(struct se_if_priv *priv,
> + struct se_api_msg *msg,
> + u8 msg_id,
> + u8 sz,
> + bool is_base_api)
> +{
> + struct se_msg_hdr *header = &msg->header;
> + u32 status;
> +
> + if (header->tag != priv->if_defs->rsp_tag) {
> + dev_err(priv->dev,
> + "MSG[0x%x] Hdr: Resp tag mismatch. (0x%x != 0x%x)",
> + msg_id, header->tag, priv->if_defs->rsp_tag);
> + return -EINVAL;
> + }
> +
> + if (header->command != msg_id) {
> + dev_err(priv->dev,
> + "MSG Header: Cmd id mismatch. (0x%x != 0x%x)",
> + header->command, msg_id);
> + return -EINVAL;
> + }
> +
> + if (header->size != (sz >> 2) && !check_hdr_exception_for_sz(priv, header)) {
> + dev_err(priv->dev,
> + "MSG[0x%x] Hdr: Cmd size mismatch. (0x%x != 0x%x)",
> + msg_id, header->size, (sz >> 2));
> + return -EINVAL;
> + }
> +
> + if (is_base_api && header->ver != priv->if_defs->base_api_ver) {
> + dev_err(priv->dev,
> + "MSG[0x%x] Hdr: Base API Vers mismatch. (0x%x != 0x%x)",
> + msg_id, header->ver, priv->if_defs->base_api_ver);
> + return -EINVAL;
> + } else if (!is_base_api && header->ver != priv->if_defs->fw_api_ver) {
> + dev_err(priv->dev,
> + "MSG[0x%x] Hdr: FW API Vers mismatch. (0x%x != 0x%x)",
> + msg_id, header->ver, priv->if_defs->fw_api_ver);
> + return -EINVAL;
> + }
> +
> + status = RES_STATUS(msg->data[0]);
> + if (status != priv->if_defs->success_tag) {
> + dev_err(priv->dev, "Command Id[%x], Response Failure = 0x%x",
> + header->command, status);
> + return -EPERM;
> + }
> +
> + return 0;
> +}
> +
> +int se_save_imem_state(struct se_if_priv *priv, struct se_imem_buf *imem)
> +{
> + struct ele_dev_info s_info = {0};
> + int ret;
> +
> + ret = ele_get_info(priv, &s_info);
> + if (ret) {
> + dev_err(priv->dev, "Failed to get info from ELE.\n");
> + return ret;
> + }
> +
> + /* Do not save the IMEM buffer, if the current IMEM state is BAD. */
> + if (s_info.d_addn_info.imem_state == ELE_IMEM_STATE_BAD)
> + return ret;
> +
> + /* EXPORT command will save encrypted IMEM to given address,
> + * so later in resume, IMEM can be restored from the given
> + * address.
> + *
> + * Size must be at least 64 kB.
> + */
> + ret = ele_service_swap(priv,
> + imem->phyaddr,
> + ELE_IMEM_SIZE,
> + ELE_IMEM_EXPORT);
> + if (ret < 0) {
> + dev_err(priv->dev, "Failed to export IMEM.");
> + imem->size = 0;
> + } else {
> + dev_info(priv->dev,
> + "Exported %d bytes of encrypted IMEM.",
> + ret);
> + imem->size = ret;
> + }
> +
> + return ret > 0 ? 0 : ret;
> +}
> +
> +int se_restore_imem_state(struct se_if_priv *priv, struct se_imem_buf *imem)
> +{
> + struct ele_dev_info s_info;
> + int ret;
> +
> + /* get info from ELE */
> + ret = ele_get_info(priv, &s_info);
> + if (ret) {
> + dev_err(priv->dev, "Failed to get info from ELE.");
> + return ret;
> + }
> + imem->state = s_info.d_addn_info.imem_state;
> +
> + /* Get IMEM state, if 0xFE then import IMEM if imem size is non-zero. */
> + if (s_info.d_addn_info.imem_state != ELE_IMEM_STATE_BAD || !imem->size)
> + return ret;
> +
> + /* IMPORT command will restore IMEM from the given
> + * address, here size is the actual size returned by ELE
> + * during the export operation
> + */
> + ret = ele_service_swap(priv,
> + imem->phyaddr,
> + imem->size,
> + ELE_IMEM_IMPORT);
> + if (ret) {
> + dev_err(priv->dev, "Failed to import IMEM");
> + return ret;
> + }
> +
> + /* After importing IMEM, check if IMEM state is equal to 0xCA
> + * to ensure IMEM is fully loaded and
> + * ELE functionality can be used.
> + */
> + ret = ele_get_info(priv, &s_info);
> + if (ret) {
> + dev_err(priv->dev, "Failed to get info from ELE.");
> + return ret;
> + }
> + imem->state = s_info.d_addn_info.imem_state;
> +
> + if (s_info.d_addn_info.imem_state == ELE_IMEM_STATE_OK)
> + dev_info(priv->dev, "Successfully restored IMEM.");
suggest use dev_dbg here to avoid anoise user.
> + else
> + dev_err(priv->dev, "Failed to restore IMEM.");
> +
> + return ret;
> +}
> diff --git a/drivers/firmware/imx/ele_common.h b/drivers/firmware/imx/ele_common.h
> new file mode 100644
> index 000000000000..c95e45123b5b
> --- /dev/null
> +++ b/drivers/firmware/imx/ele_common.h
> @@ -0,0 +1,50 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * Copyright 2025 NXP
> + */
> +
> +#ifndef __ELE_COMMON_H__
> +#define __ELE_COMMON_H__
> +
> +#include "se_ctrl.h"
> +
> +#define ELE_SUCCESS_IND 0xD6
> +
> +#define IMX_ELE_FW_DIR "imx/ele/"
> +
> +u32 se_add_msg_chksum(u32 *msg, u32 msg_len);
> +int ele_msg_rcv(struct se_if_priv *priv,
> + struct se_clbk_handle *se_clbk_hdl);
> +int ele_msg_send(struct se_if_priv *priv,
> + void *tx_msg,
> + int tx_msg_sz);
> +int ele_msg_send_rcv(struct se_if_priv *priv,
> + void *tx_msg,
> + int tx_msg_sz,
> + void *rx_msg,
> + int exp_rx_msg_sz);
> +void se_if_rx_callback(struct mbox_client *mbox_cl, void *msg);
> +int se_val_rsp_hdr_n_status(struct se_if_priv *priv,
> + struct se_api_msg *msg,
> + 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 se_fill_cmd_msg_hdr(struct se_if_priv *priv,
> + struct se_msg_hdr *hdr,
> + u8 cmd, u32 len,
> + bool is_base_api)
> +{
> + hdr->tag = priv->if_defs->cmd_tag;
> + hdr->ver = (is_base_api) ? priv->if_defs->base_api_ver : priv->if_defs->fw_api_ver;
> + hdr->command = cmd;
> + hdr->size = len >> 2;
> +
> + return 0;
> +}
> +
> +int se_save_imem_state(struct se_if_priv *priv, struct se_imem_buf *imem);
> +int se_restore_imem_state(struct se_if_priv *priv, struct se_imem_buf *imem);
> +
> +#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..be381980fec0
> --- /dev/null
> +++ b/drivers/firmware/imx/se_ctrl.c
> @@ -0,0 +1,402 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright 2025 NXP
> + */
> +
> +#include <linux/completion.h>
> +#include <linux/delay.h>
> +#include <linux/dev_printk.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/errno.h>
> +#include <linux/export.h>
> +#include <linux/firmware.h>
> +#include <linux/firmware/imx/se_api.h>
> +#include <linux/genalloc.h>
> +#include <linux/init.h>
> +#include <linux/io.h>
> +#include <linux/miscdevice.h>
> +#include <linux/mod_devicetable.h>
> +#include <linux/module.h>
> +#include <linux/of_platform.h>
> +#include <linux/of_reserved_mem.h>
> +#include <linux/platform_device.h>
> +#include <linux/slab.h>
> +#include <linux/string.h>
> +#include <linux/sys_soc.h>
> +
> +#include "ele_base_msg.h"
> +#include "ele_common.h"
> +#include "se_ctrl.h"
> +
> +#define MAX_SOC_INFO_DATA_SZ 256
> +#define MBOX_TX_NAME "tx"
> +#define MBOX_RX_NAME "rx"
> +#define SE_TYPE_STR_HSM "hsm"
> +#define SE_TYPE_ID_HSM 0x2
> +
> +struct se_fw_img_name {
> + const u8 *prim_fw_nm_in_rfs;
> + const u8 *seco_fw_nm_in_rfs;
> +};
> +
> +struct se_fw_load_info {
> + const struct se_fw_img_name *se_fw_img_nm;
> + bool is_fw_tobe_loaded;
> + bool imem_mgmt;
> + struct se_imem_buf imem;
> +};
> +
> +struct se_var_info {
> + u16 soc_rev;
> + struct se_fw_load_info load_fw;
> +};
> +
> +/* contains fixed information */
> +struct se_soc_info {
> + const u16 soc_id;
> + const bool soc_register;
> + const struct se_fw_img_name se_fw_img_nm;
> +};
> +
> +struct se_if_node {
> + struct se_soc_info *se_info;
> + u8 *pool_name;
> + bool reserved_dma_ranges;
> + struct se_if_defines if_defs;
> +};
> +
> +/* common for all the SoC. */
> +static struct se_var_info var_se_info;
> +
> +static struct se_soc_info se_imx8ulp_info = {
> + .soc_id = SOC_ID_OF_IMX8ULP,
> + .soc_register = true,
> + .se_fw_img_nm = {
> + .prim_fw_nm_in_rfs = IMX_ELE_FW_DIR
> + "mx8ulpa2-ahab-container.img",
> + .seco_fw_nm_in_rfs = IMX_ELE_FW_DIR
> + "mx8ulpa2ext-ahab-container.img",
> + },
> +};
> +
> +static struct se_if_node imx8ulp_se_ele_hsm = {
> + .se_info = &se_imx8ulp_info,
> + .pool_name = "sram",
> + .reserved_dma_ranges = true,
> + .if_defs = {
> + .se_if_type = SE_TYPE_ID_HSM,
> + .se_instance_id = 0,
> + .cmd_tag = 0x17,
> + .rsp_tag = 0xe1,
> + .success_tag = ELE_SUCCESS_IND,
> + .base_api_ver = MESSAGING_VERSION_6,
> + .fw_api_ver = MESSAGING_VERSION_7,
> + },
> +};
> +
> +static struct se_soc_info se_imx93_info = {
> + .soc_id = SOC_ID_OF_IMX93,
> +};
> +
> +static struct se_if_node imx93_se_ele_hsm = {
> + .se_info = &se_imx93_info,
> + .reserved_dma_ranges = true,
> + .if_defs = {
> + .se_if_type = SE_TYPE_ID_HSM,
> + .se_instance_id = 0,
> + .cmd_tag = 0x17,
> + .rsp_tag = 0xe1,
> + .success_tag = ELE_SUCCESS_IND,
> + .base_api_ver = MESSAGING_VERSION_6,
> + .fw_api_ver = MESSAGING_VERSION_7,
> + },
> +};
> +
> +static const struct of_device_id se_match[] = {
> + { .compatible = "fsl,imx8ulp-se-ele-hsm", .data = &imx8ulp_se_ele_hsm},
> + { .compatible = "fsl,imx93-se-ele-hsm", .data = &imx93_se_ele_hsm},
> + {},
> +};
> +
> +static struct se_fw_load_info *get_load_fw_instance(struct se_if_priv *priv)
> +{
> + return &var_se_info.load_fw;
> +}
> +
> +static int get_se_soc_info(struct se_if_priv *priv, const struct se_soc_info *se_info)
> +{
> + struct se_fw_load_info *load_fw = get_load_fw_instance(priv);
> + struct soc_device_attribute *attr;
> + u8 data[MAX_SOC_INFO_DATA_SZ];
> + struct ele_dev_info *s_info;
> + struct soc_device *sdev;
> + int err = 0;
> +
> + /* This function should be called once.
> + * Check if the se_soc_rev is zero to continue.
> + */
> + if (var_se_info.soc_rev)
> + return err;
> +
> + err = ele_fetch_soc_info(priv, &data);
> + if (err < 0)
> + return dev_err_probe(priv->dev, err, "Failed to fetch SoC Info.");
> + s_info = (void *)data;
> + var_se_info.soc_rev = s_info->d_info.soc_rev;
> + load_fw->imem.state = s_info->d_addn_info.imem_state;
> +
> + if (!se_info->soc_register)
> + return 0;
> +
> + attr = devm_kzalloc(priv->dev, sizeof(*attr), GFP_KERNEL);
> + if (!attr)
> + return -ENOMEM;
> +
> + if (FIELD_GET(DEV_GETINFO_MIN_VER_MASK, var_se_info.soc_rev))
> + attr->revision = devm_kasprintf(priv->dev, GFP_KERNEL, "%x.%x",
> + FIELD_GET(DEV_GETINFO_MIN_VER_MASK,
> + var_se_info.soc_rev),
> + FIELD_GET(DEV_GETINFO_MAJ_VER_MASK,
> + var_se_info.soc_rev));
> + else
> + attr->revision = devm_kasprintf(priv->dev, GFP_KERNEL, "%x",
> + FIELD_GET(DEV_GETINFO_MAJ_VER_MASK,
> + var_se_info.soc_rev));
> +
> + switch (se_info->soc_id) {
> + case SOC_ID_OF_IMX8ULP:
> + attr->soc_id = "i.MX8ULP";
> + break;
> + case SOC_ID_OF_IMX93:
> + attr->soc_id = "i.MX93";
> + break;
> + }
> +
> + err = of_property_read_string(of_root, "model",
> + &attr->machine);
This should fit in oneline.
> + if (err)
> + return -EINVAL;
> +
> + attr->family = "Freescale i.MX";
> +
> + attr->serial_number = devm_kasprintf(priv->dev,
> + GFP_KERNEL, "%016llX",
> + GET_SERIAL_NUM_FROM_UID(s_info->d_info.uid,
> + MAX_UID_SIZE >> 2));
run checkpatch.pl --strict
> +
> + sdev = soc_device_register(attr);
> + if (IS_ERR(sdev))
> + return PTR_ERR(sdev);
> +
> + return 0;
> +}
> +
> +/* interface for managed res to free a mailbox channel */
> +static void if_mbox_free_channel(void *mbox_chan)
> +{
> + mbox_free_channel(mbox_chan);
> +}
> +
> +static int se_if_request_channel(struct device *dev,
> + struct mbox_chan **chan,
> + struct mbox_client *cl,
> + const char *name)
> +{
> + struct mbox_chan *t_chan;
> + int ret = 0;
> +
> + t_chan = mbox_request_channel_byname(cl, name);
> + if (IS_ERR(t_chan))
> + return dev_err_probe(dev, PTR_ERR(t_chan),
> + "Failed to request %s channel.", name);
> +
> + ret = devm_add_action_or_reset(dev, if_mbox_free_channel, t_chan);
> + if (ret)
> + return dev_err_probe(dev, -EPERM,
> + "Failed to add-action for removal of mbox: %s\n",
> + name);
> + *chan = t_chan;
> +
> + return ret;
> +}
> +
> +static void se_if_probe_cleanup(void *plat_dev)
> +{
> + struct platform_device *pdev = plat_dev;
> + struct se_fw_load_info *load_fw;
> + struct device *dev = &pdev->dev;
> + struct se_if_priv *priv;
> +
> + priv = dev_get_drvdata(dev);
> + load_fw = get_load_fw_instance(priv);
> +
> + /* In se_if_request_channel(), passed the clean-up functional
> + * pointer reference as action to devm_add_action_or_reset().
> + * No need to free the mbox channels here.
> + */
Mult line comments require
/*
* In ...
*/
> +
> + /* free the buffer in se remove, previously allocated
> + * in se probe to store encrypted IMEM
> + */
> + if (load_fw && load_fw->imem.buf) {
> + dmam_free_coherent(dev,
> + ELE_IMEM_SIZE,
> + load_fw->imem.buf,
> + load_fw->imem.phyaddr);
> + load_fw->imem.buf = NULL;
> + }
> +
> + /* No need to check, if reserved memory is allocated
> + * before calling for its release. Or clearing the
> + * un-set bit.
> + */
> + of_reserved_mem_device_release(dev);
> +}
> +
> +static int se_if_probe(struct platform_device *pdev)
> +{
> + const struct se_soc_info *se_info;
> + const struct se_if_node *if_node;
> + struct se_fw_load_info *load_fw;
> + struct device *dev = &pdev->dev;
> + struct se_if_priv *priv;
> + int ret;
> +
> + if_node = device_get_match_data(dev);
> + if (!if_node)
> + return -EINVAL;
> +
> + se_info = if_node->se_info;
> +
> + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> + if (!priv)
> + return -ENOMEM;
> +
> + priv->dev = dev;
> + priv->if_defs = &if_node->if_defs;
> + dev_set_drvdata(dev, priv);
> +
> + ret = devm_add_action_or_reset(dev, se_if_probe_cleanup, pdev);
> + if (ret)
> + return ret;
> +
> + /* Mailbox client configuration */
> + priv->se_mb_cl.dev = dev;
> + priv->se_mb_cl.tx_block = false;
> + priv->se_mb_cl.knows_txdone = true;
> + priv->se_mb_cl.rx_callback = se_if_rx_callback;
> +
> + ret = se_if_request_channel(dev, &priv->tx_chan,
> + &priv->se_mb_cl, MBOX_TX_NAME);
> + if (ret)
> + return ret;
> +
> + ret = se_if_request_channel(dev, &priv->rx_chan,
> + &priv->se_mb_cl, MBOX_RX_NAME);
> + if (ret)
> + return ret;
> +
> + mutex_init(&priv->se_if_cmd_lock);
> +
> + init_completion(&priv->waiting_rsp_clbk_hdl.done);
> + init_completion(&priv->cmd_receiver_clbk_hdl.done);
> +
> + if (if_node->pool_name) {
> + priv->mem_pool = of_gen_pool_get(dev->of_node,
> + if_node->pool_name, 0);
> + if (!priv->mem_pool)
> + return dev_err_probe(dev, -ENOMEM,
> + "Unable to get sram pool = %s.",
> + if_node->pool_name);
> + }
> +
> + if (if_node->reserved_dma_ranges) {
> + ret = of_reserved_mem_device_init(dev);
> + if (ret)
> + return dev_err_probe(dev, ret,
> + "Failed to init reserved memory region.");
> + }
> +
> + if (if_node->if_defs.se_if_type == SE_TYPE_ID_HSM) {
> + ret = get_se_soc_info(priv, se_info);
> + if (ret)
> + return dev_err_probe(dev, ret,
> + "Failed to fetch SoC Info.");
> + }
> +
> + /* By default, there is no pending FW to be loaded.*/
> + if (se_info->se_fw_img_nm.prim_fw_nm_in_rfs ||
> + se_info->se_fw_img_nm.seco_fw_nm_in_rfs) {
> + load_fw = get_load_fw_instance(priv);
> + load_fw->se_fw_img_nm = &se_info->se_fw_img_nm;
> + load_fw->is_fw_tobe_loaded = true;
> +
> + if (se_info->se_fw_img_nm.prim_fw_nm_in_rfs) {
> + /* allocate buffer where SE store encrypted IMEM */
> + load_fw->imem.buf = dmam_alloc_coherent(priv->dev, ELE_IMEM_SIZE,
> + &load_fw->imem.phyaddr,
> + GFP_KERNEL);
> + if (!load_fw->imem.buf)
> + return dev_err_probe(dev, -ENOMEM,
> + "dmam-alloc-failed: To store encr-IMEM.");
> + load_fw->imem_mgmt = true;
> + }
> + }
> + dev_info(dev, "i.MX secure-enclave: %s%d interface to firmware, configured.",
> + SE_TYPE_STR_HSM,
> + priv->if_defs->se_instance_id);
> +
> + return ret;
> +}
> +
> +static void se_if_remove(struct platform_device *pdev)
> +{
> + se_if_probe_cleanup(pdev);
> +}
> +
> +static int se_suspend(struct device *dev)
> +{
> + struct se_if_priv *priv = dev_get_drvdata(dev);
> + struct se_fw_load_info *load_fw;
> + int ret = 0;
> +
> + load_fw = get_load_fw_instance(priv);
> +
> + if (load_fw->imem_mgmt)
> + ret = se_save_imem_state(priv, &load_fw->imem);
> +
> + return ret;
> +}
> +
> +static int se_resume(struct device *dev)
> +{
> + struct se_if_priv *priv = dev_get_drvdata(dev);
> + struct se_fw_load_info *load_fw;
> +
> + load_fw = get_load_fw_instance(priv);
> +
> + if (load_fw->imem_mgmt)
> + se_restore_imem_state(priv, &load_fw->imem);
> +
> + return 0;
> +}
> +
> +static const struct dev_pm_ops se_pm = {
> + SET_SYSTEM_SLEEP_PM_OPS(se_suspend, se_resume)
> +};
> +
> +static struct platform_driver se_driver = {
> + .driver = {
> + .name = "fsl-se",
> + .of_match_table = se_match,
> + .pm = &se_pm,
> + },
> + .probe = se_if_probe,
> + .remove = se_if_remove,
> +};
> +MODULE_DEVICE_TABLE(of, se_match);
> +
> +module_platform_driver(se_driver);
> +MODULE_AUTHOR("Pankaj Gupta <pankaj.gupta@....com>");
> +MODULE_DESCRIPTION("iMX Secure Enclave Driver.");
> +MODULE_LICENSE("GPL");
> diff --git a/drivers/firmware/imx/se_ctrl.h b/drivers/firmware/imx/se_ctrl.h
> new file mode 100644
> index 000000000000..177623f3890e
> --- /dev/null
> +++ b/drivers/firmware/imx/se_ctrl.h
> @@ -0,0 +1,84 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * Copyright 2025 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 SE_MSG_WORD_SZ 0x4
> +
> +#define RES_STATUS(x) FIELD_GET(0x000000ff, x)
> +#define MAX_NVM_MSG_LEN (256)
> +#define MESSAGING_VERSION_6 0x6
> +#define MESSAGING_VERSION_7 0x7
> +
> +struct se_clbk_handle {
> + struct completion done;
> + bool signal_rcvd;
> + u32 rx_msg_sz;
> + /* Assignment of the rx_msg buffer to held till the
> + * received content as part callback function, is copied.
> + */
> + struct se_api_msg *rx_msg;
> +};
> +
> +struct se_imem_buf {
> + u8 *buf;
> + phys_addr_t phyaddr;
> + u32 size;
> + u32 state;
> +};
> +
> +/* Header of the messages exchange with the EdgeLock Enclave */
> +struct se_msg_hdr {
> + u8 ver;
> + u8 size;
> + u8 command;
> + u8 tag;
> +} __packed;
> +
> +#define SE_MU_HDR_SZ 4
> +
> +struct se_api_msg {
> + struct se_msg_hdr header;
> + u32 data[];
> +};
> +
> +struct se_if_defines {
> + const u8 se_if_type;
> + const u8 se_instance_id;
This is not used actually, you can remove it
> + u8 cmd_tag;
> + u8 rsp_tag;
> + u8 success_tag;
> + u8 base_api_ver;
> + u8 fw_api_ver;
> +};
> +
> +struct se_if_priv {
> + struct device *dev;
> +
> + struct se_clbk_handle cmd_receiver_clbk_hdl;
> + /* Update to the waiting_rsp_dev, to be protected
> + * under se_if_cmd_lock.
> + */
> + struct se_clbk_handle waiting_rsp_clbk_hdl;
> + /*
> + * prevent new command to be sent on the se interface while previous
> + * command is still processing. (response is awaited)
> + */
> + struct mutex se_if_cmd_lock;
> +
> + struct mbox_client se_mb_cl;
> + struct mbox_chan *tx_chan, *rx_chan;
> +
> + struct gen_pool *mem_pool;
> + const struct se_if_defines *if_defs;
> +};
> +
> +#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..b1c4c9115d7b
> --- /dev/null
> +++ b/include/linux/firmware/imx/se_api.h
> @@ -0,0 +1,14 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * Copyright 2025 NXP
> + */
> +
> +#ifndef __SE_API_H__
> +#define __SE_API_H__
> +
> +#include <linux/types.h>
> +
> +#define SOC_ID_OF_IMX8ULP 0x084d
> +#define SOC_ID_OF_IMX93 0x9300
> +
> +#endif /* __SE_API_H__ */
>
> --
> 2.43.0
>
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