RE: [PATCH v4 6/7] firmware: imx: add driver for NXP EdgeLock Enclave

From: Varun Sethi
Date: Mon Aug 14 2023 - 03:54:02 EST

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Please find comments inline.

Regards
Varun

> -----Original Message-----
> From: Pankaj Gupta <pankaj.gupta@xxxxxxx>
> Sent: Monday, August 14, 2023 12:29 PM
> To: Varun Sethi <V.Sethi@xxxxxxx>
> Subject: FW: [PATCH v4 6/7] firmware: imx: add driver for NXP EdgeLock
> Enclave
>
>
>
> -----Original Message-----
> From: Pankaj Gupta <pankaj.gupta@xxxxxxx>
> Sent: Wednesday, July 12, 2023 5:42 PM
> To: shawnguo@xxxxxxxxxx; s.hauer@xxxxxxxxxxxxxx;
> kernel@xxxxxxxxxxxxxx; clin@xxxxxxxx; conor+dt@xxxxxxxxxx;
> pierre.gondois@xxxxxxx; Jacky Bai <ping.bai@xxxxxxx>; Clark Wang
> <xiaoning.wang@xxxxxxx>; Wei Fang <wei.fang@xxxxxxx>; Peng Fan
> <peng.fan@xxxxxxx>; Bough Chen <haibo.chen@xxxxxxx>;
> festevam@xxxxxxxxx; dl-linux-imx <linux-imx@xxxxxxx>;
> davem@xxxxxxxxxxxxx; robh+dt@xxxxxxxxxx;
> krzysztof.kozlowski+dt@xxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx;
> devicetree@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; Gaurav Jain
> <gaurav.jain@xxxxxxx>; alexander.stein@xxxxxxxxxxxxxxx; Sahil Malhotra
> <sahil.malhotra@xxxxxxx>; Aisheng Dong <aisheng.dong@xxxxxxx>; Varun
> Sethi <V.Sethi@xxxxxxx>
> Cc: Pankaj Gupta <pankaj.gupta@xxxxxxx>; kernel test robot
> <lkp@xxxxxxxxx>
> Subject: [PATCH v4 6/7] firmware: imx: add driver for NXP EdgeLock Enclave
>
> The Edgelock Enclave , is the secure enclave embedded in the SoC
> to support the features like HSM, SHE & V2X, using message based
> communication channel.
>
> ELE FW communicates on a dedicated MU with application core where
> kernel is running. It exists on specific i.MX processors. e.g. i.MX8ULP,
> i.MX93.
>
> Signed-off-by: Gaurav Jain <gaurav.jain@xxxxxxx>
> Signed-off-by: Pankaj Gupta <pankaj.gupta@xxxxxxx>
> Reported-by: kernel test robot <lkp@xxxxxxxxx>
> ---
> drivers/firmware/imx/Kconfig | 12 +
> drivers/firmware/imx/Makefile | 2 +
> drivers/firmware/imx/ele_base_msg.c | 372 ++++++
> drivers/firmware/imx/ele_fw_api.c | 112 ++
> drivers/firmware/imx/se_fw.c | 1443 +++++++++++++++++++++
> drivers/firmware/imx/se_fw.h | 180 +++
> include/linux/firmware/imx/ele_base_msg.h | 62 +
> include/linux/firmware/imx/ele_fw_api.h | 19 +
> include/linux/firmware/imx/ele_mu_ioctl.h | 52 +
> 9 files changed, 2254 insertions(+)
> create mode 100644 drivers/firmware/imx/ele_base_msg.c
> create mode 100644 drivers/firmware/imx/ele_fw_api.c
> create mode 100644 drivers/firmware/imx/se_fw.c
> create mode 100644 drivers/firmware/imx/se_fw.h
> create mode 100644 include/linux/firmware/imx/ele_base_msg.h
> create mode 100644 include/linux/firmware/imx/ele_fw_api.h
> create mode 100644 include/linux/firmware/imx/ele_mu_ioctl.h
>
[Varun] This diver needs to be refactored. Break this into the following:
1. Base driver functionality.
2. Services using this driver (HWRNG, ping, fuse read)
3. Also, consider moving services to separate files

> diff --git a/drivers/firmware/imx/Kconfig b/drivers/firmware/imx/Kconfig
> index c027d99f2a59..2822e5d4b24c 100644
> --- a/drivers/firmware/imx/Kconfig
> +++ b/drivers/firmware/imx/Kconfig
> @@ -28,3 +28,15 @@ config IMX_SCU_PD
> depends on IMX_SCU
> help
> The System Controller Firmware (SCFW) based power domain driver.
> +
> +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 b76acbade2a0..f586feaf807d 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-$(CONFIG_IMX_SCU_PD) += scu-pd.o
> +sec_enclave-objs = se_fw.o ele_base_msg.o ele_fw_api.o
> +obj-${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..f6cedbef82f9
> --- /dev/null
> +++ b/drivers/firmware/imx/ele_base_msg.c
> @@ -0,0 +1,372 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright 2021-2023 NXP
> + */
> +
> +#include <linux/types.h>
> +#include <linux/completion.h>
> +
> +#include <linux/firmware/imx/ele_base_msg.h>
> +#include <linux/firmware/imx/ele_mu_ioctl.h>
> +
> +#include "se_fw.h"
> +
> +/* Fill a command message header with a given command ID and length in
> bytes. */
> +static int plat_fill_cmd_msg_hdr(struct mu_hdr *hdr,
> + uint8_t cmd,
> + uint32_t len)
> +{
> + struct ele_mu_priv *priv = NULL;
> + int err;
> +
> + err = get_ele_mu_priv(&priv);
> + if (err) {
> + pr_err("Error: iMX EdgeLock Enclave MU, used before
> probing.\n");
> + return err;
> + }
> +
> + hdr->tag = priv->cmd_tag;
> + hdr->ver = ELE_BASE_API_VERSION;
> + hdr->command = cmd;
> + hdr->size = len >> 2;
> +
> + return err;
> +}
> +
> +static u32 plat_add_msg_crc(uint32_t *msg, uint32_t msg_len)
> +{
> + uint32_t i;
> + uint32_t crc = 0;
> + uint32_t nb_words = msg_len >> 2;
> +
> + for (i = 0; i < nb_words - 1; i++)
> + crc ^= *(msg + i);
> +
> + return crc;
> +}
> +
> +int imx_ele_msg_send_rcv(struct ele_mu_priv *priv)
> +{
> + unsigned int wait;
> + int err;
> +
> + mutex_lock(&priv->mu_cmd_lock);
> + mutex_lock(&priv->mu_lock);
> +
> + err = mbox_send_message(priv->tx_chan, &priv->tx_msg);
> + if (err < 0) {
> + pr_err("Error: mbox_send_message failure.\n");
> + mutex_unlock(&priv->mu_lock);
> + return err;
> + }
> + mutex_unlock(&priv->mu_lock);
> +
> + wait = msecs_to_jiffies(1000);
> + if (!wait_for_completion_timeout(&priv->done, wait)) {
> + pr_err("Error: wait_for_completion timed out.\n");
> + err = -ETIMEDOUT;
> + }
> +
> + mutex_unlock(&priv->mu_cmd_lock);
> +
> + return err;
> +}
> +
> +static int read_otp_uniq_id(struct ele_mu_priv *priv, u32 *value)
> +{
> + unsigned int tag, command, size, ver, status;
> +
> + tag = MSG_TAG(priv->rx_msg.header);
> + command = MSG_COMMAND(priv->rx_msg.header);
> + size = MSG_SIZE(priv->rx_msg.header);
> + ver = MSG_VER(priv->rx_msg.header);
> + status = RES_STATUS(priv->rx_msg.data[0]);
> +
> + if (tag == priv->rsp_tag &&
> + command == ELE_READ_FUSE_REQ &&
> + size == ELE_READ_FUSE_RSP_MSG_SZ &&
> + ver == ELE_BASE_API_VERSION &&
> + status == ELE_SUCCESS_IND) {
> + value[0] = priv->rx_msg.data[1];
> + value[1] = priv->rx_msg.data[2];
> + value[2] = priv->rx_msg.data[3];
> + value[3] = priv->rx_msg.data[4];
> + return 0;
> + }
> +
> + return -EINVAL;
> +}
> +
> +static int read_fuse_word(struct ele_mu_priv *priv, u32 *value)
> +{
> + unsigned int tag, command, size, ver, status;
> +
> + tag = MSG_TAG(priv->rx_msg.header);
> + command = MSG_COMMAND(priv->rx_msg.header);
> + size = MSG_SIZE(priv->rx_msg.header);
> + ver = MSG_VER(priv->rx_msg.header);
> + status = RES_STATUS(priv->rx_msg.data[0]);
> +
> + if (tag == priv->rsp_tag &&
> + command == ELE_READ_FUSE_REQ &&
> + size == ELE_READ_FUSE_REQ_MSG_SZ &&
> + ver == ELE_BASE_API_VERSION &&
> + status == ELE_SUCCESS_IND) {
> + value[0] = priv->rx_msg.data[1];
> + return 0;
> + }
> +
> + return -EINVAL;
> +}
> +
> +int read_common_fuse(uint16_t fuse_id, u32 *value)
> +{
> + struct ele_mu_priv *priv = NULL;
> + int err;
> +
> + err = get_ele_mu_priv(&priv);
> + if (err) {
> + pr_err("Error: iMX EdgeLock Enclave MU, used before
> probing.\n");
> + return err;
> + }
> + err = plat_fill_cmd_msg_hdr((struct mu_hdr *)&priv-
> >tx_msg.header,
> + ELE_READ_FUSE_REQ, 8);
> + if (err) {
> + pr_err("Error: plat_fill_cmd_msg_hdr failed.\n");
> + return err;
> + }
> +
> + priv->tx_msg.data[0] = fuse_id;
> + err = imx_ele_msg_send_rcv(priv);
> + if (err < 0)
> + return err;
> +
> + switch (fuse_id) {
> + case OTP_UNIQ_ID:
> + err = read_otp_uniq_id(priv, value);
> + break;
> + default:
> + err = read_fuse_word(priv, value);
> + break;
> + }
> +
> + return err;
> +}
> +EXPORT_SYMBOL_GPL(read_common_fuse);
> +
> +int ele_ping(void)
> +{
> + struct ele_mu_priv *priv = NULL;
> + unsigned int tag, command, size, ver, status;
> + int err;
> +
> + err = get_ele_mu_priv(&priv);
> + if (err) {
> + pr_err("Error: iMX EdgeLock Enclave MU, used before
> probing.\n");
> + return err;
> + }
> + err = plat_fill_cmd_msg_hdr((struct mu_hdr *)&priv-
> >tx_msg.header,
> + ELE_PING_REQ, 4);
> + if (err) {
> + pr_err("Error: plat_fill_cmd_msg_hdr failed.\n");
> + return err;
> + }
> +
> + err = imx_ele_msg_send_rcv(priv);
> + if (err < 0)
> + return err;
> +
> + tag = MSG_TAG(priv->rx_msg.header);
> + command = MSG_COMMAND(priv->rx_msg.header);
> + size = MSG_SIZE(priv->rx_msg.header);
> + ver = MSG_VER(priv->rx_msg.header);
> + status = RES_STATUS(priv->rx_msg.data[0]);
> +
> + if (tag == priv->rsp_tag && command == ELE_PING_REQ &&
> + size == ELE_PING_REQ_MSG_SZ && ver ==
> ELE_BASE_API_VERSION &&
> + status == ELE_SUCCESS_IND)
> + return 0;
> +
> + return -EAGAIN;
> +}
> +EXPORT_SYMBOL_GPL(ele_ping);
> +
> +int ele_service_swap(phys_addr_t addr, u32 addr_size, u16 flag)
> +{
> + struct ele_mu_priv *priv;
> + int ret;
> + unsigned int tag, command, size, ver, status;
> +
> + ret = get_ele_mu_priv(&priv);
> + if (ret)
> + return ret;
> +
> + ret = plat_fill_cmd_msg_hdr((struct mu_hdr *)&priv-
> >tx_msg.header,
> + ELE_SERVICE_SWAP_REQ, 24);
> + if (ret)
> + return ret;
> +
> + priv->tx_msg.data[0] = flag;
> + priv->tx_msg.data[1] = addr_size;
> + priv->tx_msg.data[2] = ELE_NONE_VAL;
> + priv->tx_msg.data[3] = lower_32_bits(addr);
> + priv->tx_msg.data[4] = plat_add_msg_crc((uint32_t *)&priv-
> >tx_msg, 24);
> + ret = imx_ele_msg_send_rcv(priv);
> + if (ret < 0)
> + return ret;
> +
> + tag = MSG_TAG(priv->rx_msg.header);
> + command = MSG_COMMAND(priv->rx_msg.header);
> + size = MSG_SIZE(priv->rx_msg.header);
> + ver = MSG_VER(priv->rx_msg.header);
> + status = RES_STATUS(priv->rx_msg.data[0]);
> + if (tag == priv->rsp_tag &&
> + command == ELE_SERVICE_SWAP_REQ &&
> + size == ELE_SERVICE_SWAP_REQ_MSG_SZ &&
> + ver == ELE_BASE_API_VERSION &&
> + status == ELE_SUCCESS_IND) {
> + if (flag == ELE_IMEM_EXPORT)
> + return priv->rx_msg.data[1];
> + else
> + return 0;
> + }
> +
> + return -EINVAL;
> +}
> +EXPORT_SYMBOL_GPL(ele_service_swap);
> +
> +int ele_get_info(phys_addr_t addr, u32 data_size)
> +{
> + struct ele_mu_priv *priv;
> + int ret;
> + unsigned int tag, command, size, ver, status;
> +
> + ret = get_ele_mu_priv(&priv);
> + if (ret)
> + return ret;
> +
> + ret = plat_fill_cmd_msg_hdr((struct mu_hdr *)&priv-
> >tx_msg.header,
> + ELE_GET_INFO_REQ, 16);
> + if (ret)
> + return ret;
> +
> + priv->tx_msg.data[0] = upper_32_bits(addr);
> + priv->tx_msg.data[1] = lower_32_bits(addr);
> + priv->tx_msg.data[2] = data_size;
> + ret = imx_ele_msg_send_rcv(priv);
> + if (ret < 0)
> + return ret;
> +
> + tag = MSG_TAG(priv->rx_msg.header);
> + command = MSG_COMMAND(priv->rx_msg.header);
> + size = MSG_SIZE(priv->rx_msg.header);
> + ver = MSG_VER(priv->rx_msg.header);
> + status = RES_STATUS(priv->rx_msg.data[0]);
> + if (tag == priv->rsp_tag &&
> + command == ELE_GET_INFO_REQ &&
> + size == ELE_GET_INFO_REQ_MSG_SZ &&
> + ver == ELE_BASE_API_VERSION &&
> + status == ELE_SUCCESS_IND)
> + return 0;
> +
> + return -EINVAL;
> +}
> +EXPORT_SYMBOL_GPL(ele_get_info);
> +
> +/*
> + * ele_get_trng_state() - prepare and send the command to read
> + * crypto lib and TRNG state
> + * TRNG state
> + * 0x1 TRNG is in program mode
> + * 0x2 TRNG is still generating entropy
> + * 0x3 TRNG entropy is valid and ready to be read
> + * 0x4 TRNG encounter an error while generating entropy
> + *
> + * CSAL state
> + * 0x0 Crypto Lib random context initialization is not done
yet
> + * 0x1 Crypto Lib random context initialization is on-going
> + * 0x2 Crypto Lib random context initialization succeed
> + * 0x3 Crypto Lib random context initialization failed
> + *
> + * returns: csal and trng state.
> + *
> + */
> +int ele_get_trng_state(void)
> +{
> + struct ele_mu_priv *priv;
> + int ret;
> + unsigned int tag, command, size, ver, status;
> +
> + /* access ele_mu_priv data structure pointer*/
> + ret = get_ele_mu_priv(&priv);
> + if (ret)
> + return ret;
> +
> + ret = plat_fill_cmd_msg_hdr((struct mu_hdr *)&priv-
> >tx_msg.header,
> + ELE_GET_TRNG_STATE_REQ, 4);
> + if (ret)
> + return ret;
> +
> + ret = imx_ele_msg_send_rcv(priv);
> + if (ret < 0)
> + return ret;
> +
> + tag = MSG_TAG(priv->rx_msg.header);
> + command = MSG_COMMAND(priv->rx_msg.header);
> + size = MSG_SIZE(priv->rx_msg.header);
> + ver = MSG_VER(priv->rx_msg.header);
> + status = RES_STATUS(priv->rx_msg.data[0]);
> + if (tag == priv->rsp_tag &&
> + command == ELE_GET_TRNG_STATE_REQ &&
> + size == ELE_GET_TRNG_STATE_REQ_MSG_SZ &&
> + ver == ELE_BASE_API_VERSION &&
> + status == ELE_SUCCESS_IND) {
> + return (priv->rx_msg.data[1] & CSAL_TRNG_STATE_MASK);
> + }
> +
> + return -EINVAL;
> +}
> +EXPORT_SYMBOL_GPL(ele_get_trng_state);
> +
> +/*
> + * ele_start_rng() - prepare and send the command to start
> + * initialization of the ELE RNG context
> + *
> + * returns: 0 on success.
> + */
> +int ele_start_rng(void)
> +{
> + struct ele_mu_priv *priv;
> + int ret;
> + unsigned int tag, command, size, ver, status;
> +
> + /* access ele_mu_priv data structure pointer*/
> + ret = get_ele_mu_priv(&priv);
> + if (ret)
> + return ret;
> +
> + ret = plat_fill_cmd_msg_hdr((struct mu_hdr *)&priv-
> >tx_msg.header,
> + ELE_START_RNG_REQ, 4);
> + if (ret)
> + return ret;
> +
> + ret = imx_ele_msg_send_rcv(priv);
> + if (ret < 0)
> + return ret;
> +
> + tag = MSG_TAG(priv->rx_msg.header);
> + command = MSG_COMMAND(priv->rx_msg.header);
> + size = MSG_SIZE(priv->rx_msg.header);
> + ver = MSG_VER(priv->rx_msg.header);
> + status = RES_STATUS(priv->rx_msg.data[0]);
> + if (tag == priv->rsp_tag &&
> + command == ELE_START_RNG_REQ &&
> + size == ELE_START_RNG_REQ_MSG_SZ &&
> + ver == ELE_BASE_API_VERSION &&
> + status == ELE_SUCCESS_IND) {
> + return 0;
> + }
> +
> + return -EINVAL;
> +}
> +EXPORT_SYMBOL_GPL(ele_start_rng);
> diff --git a/drivers/firmware/imx/ele_fw_api.c
> b/drivers/firmware/imx/ele_fw_api.c
> new file mode 100644
> index 000000000000..2a3fdc42294b
> --- /dev/null
> +++ b/drivers/firmware/imx/ele_fw_api.c
> @@ -0,0 +1,112 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Copyright 2023 NXP
> + */
> +
> +#include <linux/dma-mapping.h>
> +#include <linux/firmware/imx/ele_fw_api.h>
> +
> +#include "se_fw.h"
> +
> +/* Fill a command message header with a given command ID and length in
> bytes. */
> +static int plat_fill_cmd_msg_hdr(struct mu_hdr *hdr, uint8_t cmd,
uint32_t
> len)
> +{
> + struct ele_mu_priv *priv = NULL;
> + int err = 0;
> +
> + err = get_ele_mu_priv(&priv);
> + if (err) {
> + pr_err("Error: iMX EdgeLock Enclave MU is not probed
> successfully.\n");
> + return err;
> + }
> + hdr->tag = priv->cmd_tag;
> + hdr->ver = MESSAGING_VERSION_7;
> + hdr->command = cmd;
> + hdr->size = (uint8_t)(len / sizeof(uint32_t));
> +
> + return err;
> +}
> +
> +/*
> + * ele_get_random() - prepare and send the command to proceed
> + * with a random number generation operation
> + *
> + * returns: size of the rondom number generated
> + */
> +int ele_get_random(struct hwrng *rng, void *data, size_t len, bool wait)
> +{
> + struct ele_mu_priv *priv;
> + unsigned int tag, command, size, ver, status;
> + dma_addr_t dst_dma;
> + u8 *buf;
> + int ret;
> +
> + /* access ele_mu_priv data structure pointer*/
> + ret = get_ele_mu_priv(&priv);
> + if (ret)
> + return ret;
> +
> + buf = dmam_alloc_coherent(priv->dev, len, &dst_dma,
> GFP_KERNEL);
> + if (!buf) {
> + dev_err(priv->dev, "Failed to map destination buffer
> memory\n");
> + return -ENOMEM;
> + }
> +
> + ret = plat_fill_cmd_msg_hdr((struct mu_hdr *)&priv-
> >tx_msg.header, ELE_GET_RANDOM_REQ, 16);
> + if (ret)
> + goto exit;
> +
> + priv->tx_msg.data[0] = 0x0;
> + priv->tx_msg.data[1] = dst_dma;
> + priv->tx_msg.data[2] = len;
> + ret = imx_ele_msg_send_rcv(priv);
> + if (ret < 0)
> + goto exit;
> +
> + tag = MSG_TAG(priv->rx_msg.header);
> + command = MSG_COMMAND(priv->rx_msg.header);
> + size = MSG_SIZE(priv->rx_msg.header);
> + ver = MSG_VER(priv->rx_msg.header);
> + status = RES_STATUS(priv->rx_msg.data[0]);
> + if (tag == 0xe1 && command == ELE_GET_RANDOM_REQ && size ==
> 0x02 &&
> + ver == 0x07 && status == 0xd6) {
> + memcpy(data, buf, len);
> + ret = len;
> + } else
> + ret = -EINVAL;
> +
> +exit:
> + dmam_free_coherent(priv->dev, len, buf, dst_dma);
> + return ret;
> +}
> +
> +int ele_init_fw(void)
> +{
> + struct ele_mu_priv *priv;
> + int ret;
> + unsigned int tag, command, size, ver, status;
> +
> + ret = get_ele_mu_priv(&priv);
> + if (ret)
> + return ret;
> +
> + ret = plat_fill_cmd_msg_hdr((struct mu_hdr *)&priv-
> >tx_msg.header, ELE_INIT_FW_REQ, 4);
> + if (ret)
> + return ret;
> +
> + ret = imx_ele_msg_send_rcv(priv);
> + if (ret < 0)
> + return ret;
> +
> + tag = MSG_TAG(priv->rx_msg.header);
> + command = MSG_COMMAND(priv->rx_msg.header);
> + size = MSG_SIZE(priv->rx_msg.header);
> + ver = MSG_VER(priv->rx_msg.header);
> + status = RES_STATUS(priv->rx_msg.data[0]);
> +
> + if (tag == 0xe1 && command == ELE_INIT_FW_REQ && size == 0x02
> &&
> + ver == 0x06 && status == 0xd6)
> + return 0;
> +
> + return -EINVAL;
> +}
> diff --git a/drivers/firmware/imx/se_fw.c b/drivers/firmware/imx/se_fw.c
> new file mode 100644
> index 000000000000..14e4bb4225e1
> --- /dev/null
> +++ b/drivers/firmware/imx/se_fw.c
> @@ -0,0 +1,1443 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright 2021-2023 NXP
> + */
> +
> +#include <linux/dma-mapping.h>
> +#include <linux/completion.h>
> +#include <linux/dev_printk.h>
> +#include <linux/errno.h>
> +#include <linux/export.h>
> +#include <linux/firmware/imx/ele_fw_api.h>
> +#include <linux/firmware/imx/ele_base_msg.h>
> +#include <linux/firmware/imx/ele_mu_ioctl.h>
> +#include <linux/genalloc.h>
> +#include <linux/io.h>
> +#include <linux/init.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/delay.h>
> +#include <linux/sys_soc.h>
> +#include <linux/workqueue.h>
> +
> +#include "se_fw.h"
> +
> +#define ELE_PING_INTERVAL (3600 * HZ)
> +#define ELE_TRNG_STATE_OK 0x203
> +#define ELE_GET_TRNG_STATE_RETRY_COUNT 0x5
> +
> +#define ELE_GET_INFO_BUFF_SZ 0x100
> +#define ELE_GET_INFO_READ_SZ 0xA0
> +#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 SOC_ID_OF_IMX8ULP 0x084D
> +#define SOC_ID_OF_IMX93 0x9300
> +#define SOC_VER_MASK 0xFFFF0000
> +#define SOC_ID_MASK 0x0000FFFF
> +#define DEVICE_GET_INFO_SZ 0x100
> +
> +#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 RESERVED_DMA_POOL BIT(1)
> +
> +struct ele_mu_priv *ele_priv_export;
> +
> +struct imx_info {
> + bool socdev;
> + uint8_t max_dev_ctx;
> + uint8_t cmd_tag;
> + uint8_t rsp_tag;
> + uint8_t *pool_name;
> + /* platform specific flag to enable/disable the ELE True RNG */
> + bool start_rng;
> + bool enable_ele_trng;
> + bool reserved_dma_ranges;
> + bool init_fw;
> + bool imem_mgmt;
> +};
> +
> +static const struct imx_info imx8ulp_info = {
> + .socdev = true,
> + .max_dev_ctx = 4,
> + .cmd_tag = 0x17,
> + .rsp_tag = 0xe1,
> + .pool_name = "sram-pool",
> + .start_rng = true,
> + .enable_ele_trng = false,
> + .reserved_dma_ranges = true,
> + .init_fw = false,
> + .imem_mgmt = true,
> +};
> +
> +static const struct imx_info imx93_info = {
> + .socdev = true,
> + .max_dev_ctx = 4,
> + .cmd_tag = 0x17,
> + .rsp_tag = 0xe1,
> + .pool_name = NULL,
> + .start_rng = true,
> + .enable_ele_trng = true,
> + .reserved_dma_ranges = true,
> + .init_fw = true,
> + .imem_mgmt = false,
> +};
> +
> +static const struct of_device_id ele_mu_match[] = {
> + { .compatible = "fsl,imx-ele", .data = (void *)&imx8ulp_info},
> + { .compatible = "fsl,imx93-ele", .data = (void *)&imx93_info},
> + {},
> +};
> +
> +int get_ele_mu_priv(struct ele_mu_priv **export)
> +{
> + if (!ele_priv_export)
> + return -EPROBE_DEFER;
> +
> + *export = ele_priv_export;
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(get_ele_mu_priv);
> +
> +/*
> + * Callback called by mailbox FW when data are received
> + */
> +static void ele_mu_rx_callback(struct mbox_client *c, void *msg)
> +{
> + struct device *dev = c->dev;
> + struct ele_mu_priv *priv = dev_get_drvdata(dev);
> + struct ele_mu_device_ctx *dev_ctx;
> + bool is_response = false;
> + int msg_size;
> + struct mu_hdr header;
> +
> + dev_dbg(dev, "Message received on mailbox\n");
> +
> + /* The function can be called with NULL msg */
> + if (!msg) {
> + dev_err(dev, "Message is invalid\n");
> + return;
> + }
> +
> + if (IS_ERR(msg)) {
> + dev_err(dev, "Error during reception of message: %ld\n",
> + PTR_ERR(msg));
> + 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];
> +
> + dev_dbg(dev, "Selecting device\n");
> +
> + /* 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);
> + priv->rx_msg = *(struct ele_api_msg *)msg;
> + complete(&priv->done);
> + spin_unlock(&priv->lock);
> + return;
> + }
> + } else {
> + dev_err(dev, "Failed to select a device for message:
%.8x\n",
> + *((u32 *) &header));
> + return;
> + }
> +
> + if (!dev_ctx) {
> + dev_err(dev, "No device context selected for
> message: %.8x\n",
> + *((u32 *)&header));
> + return;
> + }
> + /* Init reception */
> + msg_size = header.size;
> + if (msg_size > MAX_RECV_SIZE) {
> + devctx_err(dev_ctx, "Message is too big (%d > %d)",
> msg_size,
> + MAX_RECV_SIZE);
> + return;
> + }
> +
> + memcpy(dev_ctx->temp_resp, msg, msg_size << 2);
> + dev_ctx->temp_resp_size = msg_size;
> +
> + /* Allow user to read */
> + dev_ctx->pending_hdr = dev_ctx->temp_resp[0];
> + wake_up_interruptible(&dev_ctx->wq);
> +
> + if (is_response)
> + priv->waiting_rsp_dev = NULL;
> +
> +}
> +
> +static void ele_ping_handler(struct work_struct *work)
> +{
> + int ret;
> +
> + ret = ele_ping();
> + if (ret)
> + pr_err("ping ele failed, try again!\n");
> +
> + /* reschedule the delay work */
> + schedule_delayed_work(to_delayed_work(work),
> ELE_PING_INTERVAL);
> +}
> +static DECLARE_DELAYED_WORK(ele_ping_work, ele_ping_handler);
> +
> +static phys_addr_t get_phy_buf_mem_pool(struct device_node *of_node,
> + char *mem_pool_name,
> + u32 **buf,
> + uint32_t size)
> +{
> + struct gen_pool *mem_pool = of_gen_pool_get(of_node,
> + mem_pool_name, 0);
> + if (!mem_pool) {
> + pr_err("Unable to get sram pool\n");
> + return 0;
> + }
> +
> + *buf = (u32 *)gen_pool_alloc(mem_pool, size);
> + if (!buf) {
> + pr_err("Unable to alloc sram from sram pool\n");
> + return 0;
> + }
> +
> + return gen_pool_virt_to_phys(mem_pool, (ulong)*buf);
> +}
> +
> +static void free_phybuf_mem_pool(struct device_node *of_node,
> + char *mem_pool_name,
> + u32 *buf,
> + uint32_t size)
> +{
> + struct gen_pool *mem_pool = of_gen_pool_get(of_node,
> + mem_pool_name, 0);
> + if (!mem_pool)
> + pr_err("%s failed: Unable to get sram pool.\n", __func__);
> +
> + gen_pool_free(mem_pool, (unsigned long)buf, size);
> +}
> +
> +
> +static int imx_soc_device_register(struct platform_device *pdev,
> + struct imx_info *info)
> +{
> + struct soc_device_attribute *attr;
> + struct soc_device *dev;
> + phys_addr_t get_info_addr = 0;
> + u32 *get_info_data = NULL;
> + u8 major_ver, minor_ver;
> + int err;
> +
> + if (info->pool_name) {
> + get_info_addr = get_phy_buf_mem_pool(pdev-
> >dev.of_node,
> + info->pool_name,
> + &get_info_data,
> + DEVICE_GET_INFO_SZ);
> + } else {
> + get_info_data = dmam_alloc_coherent(&pdev->dev,
> + DEVICE_GET_INFO_SZ,
> + &get_info_addr,
> + GFP_KERNEL);
> + }
> + if (!get_info_addr) {
> + pr_err("Unable to alloc buffer for device info.\n");
> + return -ENOMEM;
> + }
> +
> + attr = kzalloc(sizeof(*attr), GFP_KERNEL);
> + if (!attr)
> + return -ENOMEM;
> +
> + err = ele_get_info(get_info_addr, ELE_GET_INFO_READ_SZ);
> + if (err) {
> + attr->revision = kasprintf(GFP_KERNEL, "A0");
> + } else {
> + major_ver =
> (get_info_data[GET_INFO_SOC_INFO_WORD_OFFSET]
> + & SOC_VER_MASK) >> 24;
> + minor_ver =
> ((get_info_data[GET_INFO_SOC_INFO_WORD_OFFSET]
> + & SOC_VER_MASK) >> 16) & 0xFF;
> + if (minor_ver)
> + attr->revision = kasprintf(GFP_KERNEL,
> + "%x.%x",
> + major_ver,
> + minor_ver);
> + else
> + attr->revision = kasprintf(GFP_KERNEL,
> + "%x",
> + major_ver);
> +
> + switch
> (get_info_data[GET_INFO_SOC_INFO_WORD_OFFSET]
> + & SOC_ID_MASK) {
> + case SOC_ID_OF_IMX8ULP:
> + attr->soc_id = kasprintf(GFP_KERNEL,
> + "i.MX8ULP");
> + break;
> + case SOC_ID_OF_IMX93:
> + attr->soc_id = kasprintf(GFP_KERNEL,
> + "i.MX93");
> + break;
> + }
> + }
> +
> + err = of_property_read_string(of_root, "model",
> + &attr->machine);
> + if (err) {
> + kfree(attr);
> + return -EINVAL;
> + }
> + attr->family = kasprintf(GFP_KERNEL, "Freescale i.MX");
> +
> + attr->serial_number
> + = kasprintf(GFP_KERNEL, "%016llX",
> +
> (u64)get_info_data[GET_INFO_SL_NUM_MSB_WORD_OFF] << 32
> + |
> get_info_data[GET_INFO_SL_NUM_LSB_WORD_OFF]);
> +
> + if (info->pool_name) {
> + free_phybuf_mem_pool(pdev->dev.of_node, info-
> >pool_name,
> + get_info_data, DEVICE_GET_INFO_SZ);
> + } else {
> + dmam_free_coherent(&pdev->dev,
> + DEVICE_GET_INFO_SZ,
> + get_info_data,
> + get_info_addr);
> + }
> +
> + dev = soc_device_register(attr);
> + if (IS_ERR(dev)) {
> + kfree(attr->soc_id);
> + kfree(attr->serial_number);
> + kfree(attr->revision);
> + kfree(attr->family);
> + kfree(attr->machine);
> + kfree(attr);
> + return PTR_ERR(dev);
> + }
> +
> + return 0;
> +}
> +
> +static int ele_do_start_rng(void)
> +{
> + int ret;
> + int count = ELE_GET_TRNG_STATE_RETRY_COUNT;
> +
> + ret = ele_get_trng_state();
> + if (ret < 0) {
> + pr_err("Failed to get trng state\n");
> + return ret;
> + } else if (ret != ELE_TRNG_STATE_OK) {
> + /* call start rng */
> + ret = ele_start_rng();
> + if (ret) {
> + pr_err("Failed to start rng\n");
> + return ret;
> + }
> +
> + /* poll get trng state API,
> ELE_GET_TRNG_STATE_RETRY_COUNT times
> + * or while trng state != 0x203
> + */
> + do {
> + msleep(10);
> + ret = ele_get_trng_state();
> + if (ret < 0) {
> + pr_err("Failed to get trng state\n");
> + return ret;
> + }
> + count--;
> + } while ((ret != ELE_TRNG_STATE_OK) && count);
> + if (ret != ELE_TRNG_STATE_OK)
> + return -EIO;
> + }
> +
> + return 0;
> +}
> +
> +/*
> + * File operations for user-space
> + */
> +
> +/* Write a message to the MU. */
> +static ssize_t ele_mu_fops_write(struct file *fp, const char __user *buf,
> + size_t size, loff_t *ppos)
> +{
> + struct ele_mu_device_ctx *dev_ctx
> + = container_of(fp->private_data,
> + struct ele_mu_device_ctx,
> + miscdev);
> + struct ele_mu_priv *ele_mu_priv = dev_ctx->priv;
> + u32 nb_words = 0;
> + struct mu_hdr header;
> + int err;
> +
> + devctx_dbg(dev_ctx, "write from buf (%p)%zu, ppos=%lld\n", 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 < ELE_MU_HDR_SZ) {
> + devctx_err(dev_ctx, "User buffer too small(%zu < %d)\n",
> + size, ELE_MU_HDR_SZ);
> + err = -ENOSPC;
> + goto exit;
> + }
> +
> + if (size > MAX_MESSAGE_SIZE_BYTES) {
> + devctx_err(dev_ctx, "User buffer too big(%zu > %d)\n", size,
> + MAX_MESSAGE_SIZE_BYTES);
> + err = -ENOSPC;
> + goto exit;
> + }
> +
> + /* Copy data to buffer */
> + if (copy_from_user(dev_ctx->temp_cmd, buf, size)) {
> + err = -EFAULT;
> + devctx_err(dev_ctx, "Fail copy message from user\n");
> + goto exit;
> + }
> +
> + print_hex_dump_debug("from user ", DUMP_PREFIX_OFFSET, 4, 4,
> + dev_ctx->temp_cmd, size, false);
> +
> + header = *((struct mu_hdr *) (&dev_ctx->temp_cmd[0]));
> +
> + /* Check the message is valid according to tags */
> + if (header.tag == ele_mu_priv->cmd_tag) {
> + /*
> + * unlocked in ele_mu_fops_read when the
> + * response to this command is read.
> + */
> + mutex_lock(&ele_mu_priv->mu_cmd_lock);
> + ele_mu_priv->waiting_rsp_dev = dev_ctx;
> + } else if (header.tag == ele_mu_priv->rsp_tag) {
> + /* Check the device context can send the command */
> + if (dev_ctx != ele_mu_priv->cmd_receiver_dev) {
> + devctx_err(dev_ctx,
> + "Channel not configured to send resp to
> FW.");
> + err = -EPERM;
> + goto exit;
> + }
> + } else {
> + devctx_err(dev_ctx, "The message does not have a valid
> TAG\n");
> + err = -EINVAL;
> + goto exit;
> + }
> +
> + /*
> + * Check that the size passed as argument matches the size
> + * carried in the message.
> + */
> + nb_words = header.size;
> + if (nb_words << 2 != size) {
> + devctx_err(dev_ctx, "User buffer too small\n");
> + goto exit;
> + }
> +
> + mutex_lock(&ele_mu_priv->mu_lock);
> +
> + /* Send message */
> + devctx_dbg(dev_ctx, "sending message\n");
> + err = mbox_send_message(ele_mu_priv->tx_chan, dev_ctx-
> >temp_cmd);
> + if (err < 0) {
> + devctx_err(dev_ctx, "Failed to send message\n");
> + goto unlock;
> + }
> +
> + err = nb_words << 2;
> +
> +unlock:
> + mutex_unlock(&ele_mu_priv->mu_lock);
> +
> +exit:
> + if (err < 0)
> + mutex_unlock(&ele_mu_priv->mu_cmd_lock);
> + up(&dev_ctx->fops_lock);
> + return err;
> +}
> +
> +/*
> + * Read a message from the MU.
> + * Blocking until a message is available.
> + */
> +static ssize_t ele_mu_fops_read(struct file *fp, char __user *buf,
> + size_t size, loff_t *ppos)
> +{
> + struct ele_mu_device_ctx *dev_ctx
> + = container_of(fp->private_data,
> + struct ele_mu_device_ctx,
> + miscdev);
> + struct ele_mu_priv *ele_mu_priv = dev_ctx->priv;
> + u32 data_size = 0, size_to_copy = 0;
> + struct ele_buf_desc *b_desc;
> + int err;
> + struct mu_hdr header = {0};
> +
> + devctx_dbg(dev_ctx, "read to buf %p(%zu), ppos=%lld\n", buf, size,
> + ((ppos) ? *ppos : 0));
> +
> + if (down_interruptible(&dev_ctx->fops_lock))
> + return -EBUSY;
> +
> + if (dev_ctx->status != MU_OPENED) {
> + err = -EINVAL;
> + goto exit;
> + }
> +
> + /* Wait until the complete message is received on the MU. */
> + if (wait_event_interruptible(dev_ctx->wq, dev_ctx->pending_hdr !=
> 0)) {
> + devctx_err(dev_ctx, "Err[0x%x]:Interrupted by signal.\n",
> err);
> + err = -EINTR;
> + goto exit;
> + }
> +
> + devctx_dbg(dev_ctx, "%s %s\n", __func__,
> + "message received, start transmit to user");
> +
> + /* Check that the size passed as argument is larger than
> + * the one carried in the message.
> + */
> + data_size = dev_ctx->temp_resp_size << 2;
> + size_to_copy = data_size;
> + if (size_to_copy > size) {
> + devctx_dbg(dev_ctx, "User buffer too small (%zu < %d)\n",
> + 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 ele_buf_desc,
> + link);
> + if (!b_desc)
> + continue;
> +
> + if (b_desc->usr_buf_ptr && b_desc->shared_buf_ptr) {
> +
> + devctx_dbg(dev_ctx, "Copy output data to user\n");
> + if (copy_to_user(b_desc->usr_buf_ptr,
> + b_desc->shared_buf_ptr,
> + b_desc->size)) {
> + devctx_err(dev_ctx,
> + "Failure copying output data to
> user.");
> + 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);
> + devm_kfree(dev_ctx->dev, b_desc);
> + }
> +
> + header = *((struct mu_hdr *) (&dev_ctx->temp_resp[0]));
> +
> + /* 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)) {
> + devctx_err(dev_ctx, "Failed to copy to user\n");
> + err = -EFAULT;
> + goto exit;
> + }
> +
> + err = size_to_copy;
> +
> + /* 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
ele_buf_desc,
> + link);
> + else
> + b_desc = list_first_entry_or_null(&dev_ctx-
> >pending_out,
> + struct
ele_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);
> + }
> + if (header.tag == ele_mu_priv->rsp_tag)
> + mutex_unlock(&ele_mu_priv->mu_cmd_lock);
> +
> + up(&dev_ctx->fops_lock);
> + return err;
> +}
> +
> +/* Give access to EdgeLock Enclave, to the memory we want to share */
> +static int ele_mu_setup_ele_mem_access(struct ele_mu_device_ctx
> *dev_ctx,
> + u64 addr, u32 len)
> +{
> + /* Assuming EdgeLock Enclave has access to all the memory regions
> */
> + int ret = 0;
> +
> + if (ret) {
> + devctx_err(dev_ctx, "Fail find memreg\n");
> + goto exit;
> + }
> +
> + if (ret) {
> + devctx_err(dev_ctx, "Fail set permission for resource\n");
> + goto exit;
> + }
> +
> +exit:
> + return ret;
> +}
> +
> +static int ele_mu_ioctl_get_mu_info(struct ele_mu_device_ctx *dev_ctx,
> + unsigned long arg)
> +{
> + struct ele_mu_priv *priv = dev_get_drvdata(dev_ctx->dev);
> + struct ele_mu_ioctl_get_mu_info info;
> + int err = -EINVAL;
> +
> + info.ele_mu_id = priv->ele_mu_id;
> + info.interrupt_idx = 0;
> + info.tz = 0;
> + info.did = priv->ele_mu_did;
> +
> + devctx_dbg(dev_ctx,
> + "info [mu_idx: %d, irq_idx: %d, tz: 0x%x, did: 0x%x]\n",
> + info.ele_mu_id, info.interrupt_idx, info.tz, info.did);
> +
> + if (copy_to_user((u8 *)arg, &info, sizeof(info))) {
> + devctx_err(dev_ctx, "Failed to copy mu info to user\n");
> + 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 ele_mu_ioctl_setup_iobuf_handler(struct ele_mu_device_ctx
> *dev_ctx,
> + unsigned long arg)
> +{
> + struct ele_buf_desc *b_desc;
> + struct ele_mu_ioctl_setup_iobuf io = {0};
> + struct ele_shared_mem *shared_mem;
> + int err = 0;
> + u32 pos;
> +
> + if (copy_from_user(&io, (u8 *)arg, sizeof(io))) {
> + devctx_err(dev_ctx, "Failed copy iobuf config from user\n");
> + err = -EFAULT;
> + goto exit;
> + }
> +
> + devctx_dbg(dev_ctx, "io [buf: %p(%d) flag: %x]\n",
> + 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 & ELE_MU_IO_FLAGS_USE_SEC_MEM) {
> + /* App requires to use secure memory for this buffer.*/
> + devctx_err(dev_ctx, "Failed allocate SEC MEM memory\n");
> + 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) {
> + devctx_err(dev_ctx, "Not enough space in shared
> memory\n");
> + 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 & ELE_MU_IO_FLAGS_USE_SEC_MEM) &&
> + !(io.flags & ELE_MU_IO_FLAGS_USE_SHORT_ADDR)) {
> + /*Add base address to get full address.*/
> + devctx_err(dev_ctx, "Failed allocate SEC MEM memory\n");
> + err = -EFAULT;
> + goto exit;
> + }
> +
> + memset(shared_mem->ptr + pos, 0, io.length);
> + if ((io.flags & ELE_MU_IO_FLAGS_IS_INPUT) ||
> + (io.flags & ELE_MU_IO_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)) {
> + devctx_err(dev_ctx,
> + "Failed copy data to shared memory\n");
> + err = -EFAULT;
> + goto exit;
> + }
> + }
> +
> + b_desc = devm_kmalloc(dev_ctx->dev, sizeof(*b_desc),
> GFP_KERNEL);
> + if (!b_desc) {
> + err = -ENOMEM;
> + devctx_err(dev_ctx,
> + "Failed allocating mem for pending buffer\n"
> + );
> + goto exit;
> + }
> +
> + 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 & ELE_MU_IO_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 ELE
> + * response.
> + */
> + list_add_tail(&b_desc->link, &dev_ctx->pending_out);
> + }
> +
> +copy:
> + /* Provide the EdgeLock Enclave address to user space only if
> success.*/
> + if (copy_to_user((u8 *)arg, &io, sizeof(io))) {
> + devctx_err(dev_ctx, "Failed to copy iobuff setup to
user\n");
> + err = -EFAULT;
> + goto exit;
> + }
> +exit:
> + return err;
> +}
> +
> +
> +
> +/* Open a char device. */
> +static int ele_mu_fops_open(struct inode *nd, struct file *fp)
> +{
> + struct ele_mu_device_ctx *dev_ctx
> + = container_of(fp->private_data,
> + struct ele_mu_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;
> + devctx_err(dev_ctx, "Failed to map shared memory with
> S40x\n");
> + goto exit;
> + }
> +
> + err = ele_mu_setup_ele_mem_access(dev_ctx,
> + dev_ctx-
> >non_secure_mem.dma_addr,
> + MAX_DATA_SIZE_PER_USER);
> + if (err) {
> + err = -EPERM;
> + devctx_err(dev_ctx,
> + "Failed to share access to shared memory\n");
> + 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 char device. */
> +static int ele_mu_fops_close(struct inode *nd, struct file *fp)
> +{
> + struct ele_mu_device_ctx *dev_ctx = container_of(fp->private_data,
> + struct ele_mu_device_ctx, miscdev);
> + struct ele_mu_priv *priv = dev_ctx->priv;
> + struct ele_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->mu_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
ele_buf_desc,
> + link);
> + else
> + b_desc = list_first_entry_or_null(&dev_ctx-
> >pending_out,
> + struct
ele_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 char device */
> +static long ele_mu_ioctl(struct file *fp, unsigned int cmd, unsigned long
arg)
> +{
> + struct ele_mu_device_ctx *dev_ctx
> + = container_of(fp->private_data,
> + struct ele_mu_device_ctx,
> + miscdev);
> + struct ele_mu_priv *ele_mu_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 ELE_MU_IOCTL_ENABLE_CMD_RCV:
> + if (!ele_mu_priv->cmd_receiver_dev) {
> + ele_mu_priv->cmd_receiver_dev = dev_ctx;
> + err = 0;
> + };
> + break;
> + case ELE_MU_IOCTL_GET_MU_INFO:
> + err = ele_mu_ioctl_get_mu_info(dev_ctx, arg);
> + break;
> + case ELE_MU_IOCTL_SHARED_BUF_CFG:
> + devctx_err(dev_ctx,
> + "ELE_MU_IOCTL_SHARED_BUF_CFG not supported
> [0x%x].\n",
> + err);
> + break;
> + case ELE_MU_IOCTL_SETUP_IOBUF:
> + err = ele_mu_ioctl_setup_iobuf_handler(dev_ctx, arg);
> + break;
> + case ELE_MU_IOCTL_SIGNED_MESSAGE:
> + devctx_err(dev_ctx,
> + "ELE_MU_IOCTL_SIGNED_MESSAGE not supported
> [0x%x].\n",
> + err);
> + break;
> + default:
> + err = -EINVAL;
> + devctx_dbg(dev_ctx, "IOCTL %.8x not supported\n", cmd);
> + }
> +
> + up(&dev_ctx->fops_lock);
> + return (long)err;
> +}
> +
> +/* Char driver setup */
> +static const struct file_operations ele_mu_fops = {
> + .open = ele_mu_fops_open,
> + .owner = THIS_MODULE,
> + .release = ele_mu_fops_close,
> + .unlocked_ioctl = ele_mu_ioctl,
> + .read = ele_mu_fops_read,
> + .write = ele_mu_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 char device */
> +static void if_misc_deregister(void *miscdevice)
> +{
> + misc_deregister(miscdevice);
> +}
> +
> +static int ele_mu_request_channel(struct device *dev,
> + struct mbox_chan **chan,
> + struct mbox_client *cl,
> + const char *name)
> +{
> + struct mbox_chan *t_chan;
> + int ret = 0;
> +
> + t_chan = mbox_request_channel_byname(cl, name);
> + if (IS_ERR(t_chan)) {
> + ret = PTR_ERR(t_chan);
> + 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 ele_probe_cleanup(struct platform_device *pdev)
> +{
> + int ret;
> + int i;
> + struct device *dev = &pdev->dev;
> + struct ele_mu_priv *priv = dev_get_drvdata(dev);
> +
> + if (!priv) {
> + ret = -EINVAL;
> + dev_err(dev, "Invalid ELE-MU Priv data");
> + 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 ele-mu remove, previously allocated
> + * in ele-mu probe to store encrypted IMEM
> + */
> + if (priv->imem.buf) {
> + dmam_free_coherent(&pdev->dev,
> + ELE_IMEM_SIZE,
> + priv->imem.buf,
> + priv->imem.phyaddr);
> + priv->imem.buf = NULL;
> + }
> +
> + if (priv->flags & RESERVED_DMA_POOL) {
> + of_reserved_mem_device_release(dev);
> + priv->flags &= (~RESERVED_DMA_POOL);
> + }
> + if (priv->ctxs) {
> + for (i = 0; i < priv->max_dev_ctx; i++) {
> + if (priv->ctxs[i])
> + devm_kfree(dev, priv->ctxs[i]);
> + }
> + devm_kfree(dev, priv->ctxs);
> + }
> + devm_kfree(dev, priv);
> + return ret;
> +}
> +
> +static int ele_mu_probe(struct platform_device *pdev)
> +{
> + struct ele_mu_device_ctx *dev_ctx;
> + struct device *dev = &pdev->dev;
> + struct ele_mu_priv *priv;
> + struct device_node *np;
> + const struct of_device_id *of_id = of_match_device(ele_mu_match,
> dev);
> + struct imx_info *info = (of_id != NULL) ? (struct imx_info *)of_id-
> >data
> + : NULL;
> + char *devname;
> + uint32_t tmp_dt_value = 0;
> + int ret;
> + int i;
> +
> + if (!info) {
> + ret = -EINVAL;
> + dev_err(dev, "%s: Incompatible Device.\n", __func__);
> + return ret;
> + }
> +
> + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> + if (!priv) {
> + ret = -ENOMEM;
> + dev_err(dev, "Fail allocate mem for private data\n");
> + return ret;
> + }
> + memset(priv, 0x0, sizeof(*priv));
> + priv->dev = dev;
> + dev_set_drvdata(dev, priv);
> +
> + /*
> + * Get the address of MU to be used for communication with the SCU
> + */
> + np = pdev->dev.of_node;
> + if (!np) {
> + dev_err(dev, "Cannot find MU User entry in device tree\n");
> + ret = -EOPNOTSUPP;
> + goto exit;
> + }
> +
> + /* Initialize the mutex. */
> + mutex_init(&priv->mu_cmd_lock);
> + mutex_init(&priv->mu_lock);
> +
> + priv->cmd_receiver_dev = NULL;
> + priv->waiting_rsp_dev = NULL;
> +
> + ret = of_property_read_u32(np, "fsl,mu-did", &tmp_dt_value);
> + if (ret) {
> + ret = -EINVAL;
> + dev_err(dev, "%s: Not able to read mu-did", __func__);
> + goto exit;
> + }
> + priv->ele_mu_did = tmp_dt_value & 0xFF;
> +
> + ret = of_property_read_u32(np, "fsl,mu-id", &tmp_dt_value);
> + if (ret) {
> + ret = -EINVAL;
> + dev_err(dev, "%s: Not able to read mu-id", __func__);
> + goto exit;
> + }
> + priv->ele_mu_id = tmp_dt_value & 0xFF;
> +
> + priv->max_dev_ctx = info->max_dev_ctx;
> +
> + priv->cmd_tag = info->cmd_tag;
> + priv->rsp_tag = info->rsp_tag;
> +
> + /* Mailbox client configuration */
> + priv->ele_mb_cl.dev = dev;
> + priv->ele_mb_cl.tx_block = false;
> + priv->ele_mb_cl.knows_txdone = true;
> + priv->ele_mb_cl.rx_callback = ele_mu_rx_callback;
> +
> + ret = ele_mu_request_channel(dev, &priv->tx_chan,
> + &priv->ele_mb_cl, "tx");
> + if (ret) {
> + if (ret != -EPROBE_DEFER)
> + dev_err(dev, "Failed to request tx channel\n");
> +
> + goto exit;
> + }
> +
> + ret = ele_mu_request_channel(dev, &priv->rx_chan,
> + &priv->ele_mb_cl, "rx");
> + if (ret) {
> + if (ret != -EPROBE_DEFER)
> + dev_err(dev, "Failed to request rx channel\n");
> +
> + goto exit;
> + }
> +
> + priv->ctxs = devm_kzalloc(dev, sizeof(dev_ctx) * priv->max_dev_ctx,
> + GFP_KERNEL);
> +
> + if (!priv->ctxs) {
> + ret = -ENOMEM;
> + dev_err(dev, "Fail allocate mem for private dev-ctxs.\n");
> + goto exit;
> + }
> +
> + /* 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;
> + dev_err(dev,
> + "Fail to allocate memory for device
> context\n");
> + goto exit;
> + }
> +
> + 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,
> "ele_mu%d_ch%d",
> + priv->ele_mu_id, i);
> + if (!devname) {
> + ret = -ENOMEM;
> + dev_err(dev,
> + "Fail to allocate memory for misc dev
> name\n");
> + goto exit;
> + }
> +
> + dev_ctx->miscdev.name = devname;
> + dev_ctx->miscdev.minor = MISC_DYNAMIC_MINOR;
> + dev_ctx->miscdev.fops = &ele_mu_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);
> + goto exit;
> + }
> +
> + 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);
> + goto exit;
> + }
> + }
> +
> + init_completion(&priv->done);
> + spin_lock_init(&priv->lock);
> +
> + ele_priv_export = priv;
> +
> + if (info && 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 && info->init_fw) {
> + /* start initializing ele fw */
> + ret = ele_init_fw();
> + if (ret)
> + dev_err(dev, "Failed to initialize ele fw.\n");
> + }
> +
> + if (info && info->socdev) {
> + ret = imx_soc_device_register(pdev, info);
> + if (ret) {
> + dev_err(dev,
> + "failed[%d] to register SoC device\n", ret);
> + goto exit;
> + }
> + }
> +
> + if (info && info->imem_mgmt) {
> + /* allocate buffer where ELE 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;
> + }
> + }
> +
> + /* start ele rng */
> + ret = ele_do_start_rng();
> + if (ret)
> + dev_err(dev, "Failed to start ele rng\n");
> +
> + if (!ret && info && info->enable_ele_trng) {
> + ret = ele_trng_init(dev);
> + if (ret)
> + dev_err(dev, "Failed to init ele-trng\n");
> + }
> +
> + /*
> + * A ELE ping request must be send at least once every day(24
hours),
> + * so setup a delay work with 1 hour interval
> + * to ping ELE periodically.
> + */
> + schedule_delayed_work(&ele_ping_work, ELE_PING_INTERVAL);
> +
> + dev_set_drvdata(dev, priv);
> +
> + pr_info("Misc-devices on i.MX enclave MU is configured.\n");
> + return devm_of_platform_populate(dev);
> +
> +exit:
> + /* if execution control reaches here, ele-mu probe fail.
> + * hence doing the cleanup
> + */
> + return ele_probe_cleanup(pdev);
> +}
> +
> +static int ele_mu_remove(struct platform_device *pdev)
> +{
> + cancel_delayed_work_sync(&ele_ping_work);
> + ele_probe_cleanup(pdev);
> +
> + return 0;
> +}
> +
> +#ifdef CONFIG_PM_SLEEP
> +static int ele_mu_suspend(struct device *dev)
> +{
> + struct ele_mu_priv *priv = dev_get_drvdata(dev);
> + const struct of_device_id *of_id = of_match_device(ele_mu_match,
> dev);
> + struct imx_info *info = (of_id != NULL) ? (struct imx_info *)of_id-
> >data
> + : NULL;
> +
> + if (info && info->imem_mgmt) {
> + int ret;
> +
> + /* EXPORT command will save encrypted IMEM to given
> address,
> + * so later in resume, IMEM can be restored from the given
> + * address.
> + *
> + * Size must be at least 64 kB.
> + */
> + ret = ele_service_swap(priv->imem.phyaddr,
> + ELE_IMEM_SIZE,
> + ELE_IMEM_EXPORT);
> + if (ret < 0)
> + dev_err(dev, "Failed to export IMEM\n");
> + else {
> + priv->imem.size = ret;
> + dev_info(dev,
> + "Exported %d bytes of encrypted IMEM\n",
> + ret);
> + }
> + }
> +
> + return 0;
> +}
> +
> +static int ele_mu_resume(struct device *dev)
> +{
> + struct ele_mu_priv *priv = dev_get_drvdata(dev);
> + int i;
> + const struct of_device_id *of_id = of_match_device(ele_mu_match,
> dev);
> + struct imx_info *info = (of_id != NULL) ? (struct imx_info *)of_id-
> >data
> + : NULL;
> +
> + for (i = 0; i < priv->max_dev_ctx; i++)
> + wake_up_interruptible(&priv->ctxs[i]->wq);
> +
> + if (info && info->imem_mgmt) {
> + int ret;
> + u32 imem_state;
> + u32 *get_info_buf = NULL;
> + phys_addr_t get_info_phyaddr = 0;
> +
> + get_info_phyaddr
> + = (info->pool_name) ?
> get_phy_buf_mem_pool(dev->of_node,
> + info->pool_name,
> + &get_info_buf,
> + DEVICE_GET_INFO_SZ)
> + : 0x0;
> +
> + if (!get_info_buf) {
> + dev_err(dev, "Unable to alloc sram from sram
> pool\n");
> + return -ENOMEM;
> + }
> +
> + ret = ele_do_start_rng();
> + if (ret)
> + goto exit;
> +
> + /* get info from ELE */
> + ret = ele_get_info(get_info_phyaddr,
> ELE_GET_INFO_READ_SZ);
> + if (ret) {
> + dev_err(dev, "Failed to get info from ELE.\n");
> + goto exit;
> + }
> +
> + /* Get IMEM state, if 0xFE then import IMEM */
> + imem_state = (get_info_buf[ELE_IMEM_STATE_WORD]
> + & ELE_IMEM_STATE_MASK) >> 16;
> + if (imem_state == ELE_IMEM_STATE_BAD) {
> + /* IMPORT command will restore IMEM from the
> given
> + * address, here size is the actual size returned by
ELE
> + * during the export operation
> + */
> + ret = ele_service_swap(priv->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(get_info_phyaddr,
> ELE_GET_INFO_READ_SZ);
> + if (ret) {
> + dev_err(dev, "Failed to get info from ELE.\n");
> + goto exit;
> + }
> +
> + imem_state = (get_info_buf[ELE_IMEM_STATE_WORD]
> + & ELE_IMEM_STATE_MASK) >> 16;
> + if (imem_state == ELE_IMEM_STATE_OK)
> + dev_info(dev, "Successfully restored IMEM\n");
> + else
> + dev_err(dev, "Failed to restore IMEM\n");
> +
> +exit:
> + if (info->pool_name && get_info_buf)
> + free_phybuf_mem_pool(dev->of_node, info-
> >pool_name,
> + get_info_buf,
> DEVICE_GET_INFO_SZ);
> + }
> +
> + return 0;
> +}
> +#endif
> +
> +static const struct dev_pm_ops ele_mu_pm = {
> + SET_SYSTEM_SLEEP_PM_OPS(ele_mu_suspend, ele_mu_resume)
> +};
> +
> +static struct platform_driver ele_mu_driver = {
> + .driver = {
> + .name = "fsl-ele-mu",
> + .of_match_table = ele_mu_match,
> + .pm = &ele_mu_pm,
> + },
> + .probe = ele_mu_probe,
> + .remove = ele_mu_remove,
> +};
> +MODULE_DEVICE_TABLE(of, ele_mu_match);
> +
> +module_platform_driver(ele_mu_driver);
> +
> +MODULE_AUTHOR("Pankaj Gupta <pankaj.gupta@xxxxxxx>");
> +MODULE_DESCRIPTION("iMX Secure Enclave MU Driver.");
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/firmware/imx/se_fw.h b/drivers/firmware/imx/se_fw.h
> new file mode 100644
> index 000000000000..a606a49cb60f
> --- /dev/null
> +++ b/drivers/firmware/imx/se_fw.h
> @@ -0,0 +1,180 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * Copyright 2021-2023 NXP
> + */
> +
> +#ifndef SE_MU_H
> +#define SE_MU_H
> +
> +#include <linux/miscdevice.h>
> +#include <linux/semaphore.h>
> +#include <linux/mailbox_client.h>
> +
> +/* macro to log operation of a misc device */
> +#define miscdev_dbg(p_miscdev, fmt, va_args...)
\
> + ({
\
> + struct miscdevice *_p_miscdev = p_miscdev;
\
> + dev_dbg((_p_miscdev)->parent, "%s: " fmt, (_p_miscdev)-
> >name, \
> + ##va_args);
\
> + })
> +
> +#define miscdev_info(p_miscdev, fmt, va_args...)
\
> + ({
\
> + struct miscdevice *_p_miscdev = p_miscdev;
\
> + dev_info((_p_miscdev)->parent, "%s: " fmt, (_p_miscdev)-
> >name, \
> + ##va_args);
\
> + })
> +
> +#define miscdev_err(p_miscdev, fmt, va_args...)
\
> + ({
\
> + struct miscdevice *_p_miscdev = p_miscdev;
\
> + dev_err((_p_miscdev)->parent, "%s: " fmt, (_p_miscdev)-
> >name, \
> + ##va_args);
\
> + })
> +/* macro to log operation of a device context */
> +#define devctx_dbg(p_devctx, fmt, va_args...) \
> + miscdev_dbg(&((p_devctx)->miscdev), fmt, ##va_args)
> +#define devctx_info(p_devctx, fmt, va_args...) \
> + miscdev_info(&((p_devctx)->miscdev), fmt, ##va_args)
> +#define devctx_err(p_devctx, fmt, va_args...) \
> + miscdev_err((&(p_devctx)->miscdev), fmt, ##va_args)
> +
> +#define MAX_MESSAGE_SIZE 31
> +#define MAX_RECV_SIZE MAX_MESSAGE_SIZE
> +#define MAX_RECV_SIZE_BYTES (MAX_RECV_SIZE << 2)
> +#define MAX_MESSAGE_SIZE_BYTES (MAX_MESSAGE_SIZE << 2)
> +#define ELE_SUCCESS_IND 0xD6
> +#define ELE_FAILURE_IND 0x29
> +
> +#define ELE_MSG_DATA_NUM 10
> +
> +#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 DEFAULT_MESSAGING_TAG_COMMAND (0x17u)
> +#define DEFAULT_MESSAGING_TAG_RESPONSE (0xe1u)
> +
> +#define ELE_MU_IO_FLAGS_USE_SEC_MEM (0x02u)
> +#define ELE_MU_IO_FLAGS_USE_SHORT_ADDR (0x04u)
> +
> +struct ele_imem_buf {
> + u8 *buf;
> + phys_addr_t phyaddr;
> + u32 size;
> +};
> +
> +struct ele_buf_desc {
> + u8 *shared_buf_ptr;
> + u8 *usr_buf_ptr;
> + u32 size;
> + struct list_head link;
> +};
> +
> +/* Status of a char device */
> +enum mu_device_status_t {
> + MU_FREE,
> + MU_OPENED
> +};
> +
> +struct ele_shared_mem {
> + dma_addr_t dma_addr;
> + u32 size;
> + u32 pos;
> + u8 *ptr;
> +};
> +
> +/* Private struct for each char device instance. */
> +struct ele_mu_device_ctx {
> + struct device *dev;
> + struct ele_mu_priv *priv;
> + struct miscdevice miscdev;
> +
> + enum mu_device_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 ele_shared_mem secure_mem;
> + struct ele_shared_mem non_secure_mem;
> +
> + u32 temp_cmd[MAX_MESSAGE_SIZE];
> + u32 temp_resp[MAX_RECV_SIZE];
> + u32 temp_resp_size;
> + struct notifier_block ele_notify;
> +};
> +
> +/* Header of the messages exchange with the EdgeLock Enclave */
> +struct mu_hdr {
> + u8 ver;
> + u8 size;
> + u8 command;
> + u8 tag;
> +} __packed;
> +
> +#define ELE_MU_HDR_SZ 4
> +#define TAG_OFFSET (ELE_MU_HDR_SZ - 1)
> +#define CMD_OFFSET (ELE_MU_HDR_SZ - 2)
> +#define SZ_OFFSET (ELE_MU_HDR_SZ - 3)
> +#define VER_OFFSET (ELE_MU_HDR_SZ - 4)
> +
> +struct ele_api_msg {
> + u32 header; /* u8 Tag; u8 Command; u8 Size; u8 Ver; */
> + u32 data[ELE_MSG_DATA_NUM];
> +};
> +
> +struct ele_mu_priv {
> + struct ele_mu_device_ctx *cmd_receiver_dev;
> + struct ele_mu_device_ctx *waiting_rsp_dev;
> + /*
> + * prevent parallel access to the MU registers
> + * e.g. a user trying to send a command while the other one is
> + * sending a response.
> + */
> + struct mutex mu_lock;
> + /*
> + * prevent a command to be sent on the MU while another one is still
> + * processing. (response to a command is allowed)
> + */
> + struct mutex mu_cmd_lock;
> + struct device *dev;
> + u8 ele_mu_did;
> + u8 ele_mu_id;
> + u8 cmd_tag;
> + u8 rsp_tag;
> +
> + struct mbox_client ele_mb_cl;
> + struct mbox_chan *tx_chan, *rx_chan;
> + struct ele_api_msg tx_msg, rx_msg;
> + struct completion done;
> + spinlock_t lock;
> + /* Flag to retain the state of initialization done at
> + * the time of ele-mu probe.
> + */
> + uint32_t flags;
> + u8 max_dev_ctx;
> + struct ele_mu_device_ctx **ctxs;
> + struct ele_imem_buf imem;
> +};
> +
> +int get_ele_mu_priv(struct ele_mu_priv **export);
> +
> +int imx_ele_msg_send_rcv(struct ele_mu_priv *priv);
> +#ifdef CONFIG_IMX_ELE_TRNG
> +int ele_trng_init(struct device *dev);
> +#else
> +static inline int ele_trng_init(struct device *dev)
> +{
> + return 0;
> +}
> +#endif
> +
> +#endif
> diff --git a/include/linux/firmware/imx/ele_base_msg.h
> b/include/linux/firmware/imx/ele_base_msg.h
> new file mode 100644
> index 000000000000..d344820bbe7f
> --- /dev/null
> +++ b/include/linux/firmware/imx/ele_base_msg.h
> @@ -0,0 +1,62 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * Copyright 2021 NXP
> + *
> + * Header file for the ELE Base API(s).
> + */
> +
> +#ifndef ELE_BASE_MSG_H
> +#define ELE_BASE_MSG_H
> +
> +#include <linux/types.h>
> +
> +#define WORD_SZ 4
> +#define MESSAGING_VERSION_7 0x7
> +#define ELE_NONE_VAL 0x0
> +
> +#define ELE_PING_REQ 0x1
> +#define ELE_PING_REQ_MSG_SZ 0x02
> +
> +#define ELE_OEM_CNTN_AUTH_REQ 0x87
> +#define ELE_VERIFY_IMAGE_REQ 0x88
> +#define ELE_RELEASE_CONTAINER_REQ 0x89
> +
> +#define ELE_READ_FUSE_REQ 0x97
> +#define ELE_READ_FUSE_RSP_MSG_SZ 0x07
> +#define ELE_READ_FUSE_REQ_MSG_SZ 0x03
> +
> +#define OTP_UNIQ_ID 0x01
> +#define OTFAD_CONFIG 0x2
> +
> +#define ELE_GET_INFO_REQ 0xDA
> +#define ELE_GET_INFO_REQ_MSG_SZ 0x02
> +
> +#define ELE_SERVICE_SWAP_REQ 0xDF
> +#define ELE_SERVICE_SWAP_REQ_MSG_SZ 0x03
> +
> +#define ELE_START_RNG_REQ 0xA3
> +#define ELE_START_RNG_REQ_MSG_SZ 0x02
> +
> +#define ELE_GET_TRNG_STATE_REQ 0xA4
> +#define ELE_GET_TRNG_STATE_REQ_MSG_SZ 0x03
> +
> +#define ELE_GET_RANDOM_REQ 0xCD
> +#define CSAL_TRNG_STATE_MASK 0x0000ffff
> +
> +#define ELE_BASE_API_VERSION 0x6
> +#define ELE_SUCCESS_IND 0xD6
> +#define ELE_FAILURE_IND 0x29
> +
> +#define ELE_MSG_DATA_NUM 10
> +
> +#define ELE_IMEM_EXPORT 0x1
> +#define ELE_IMEM_IMPORT 0x2
> +
> +int read_common_fuse(uint16_t fuse_index, u32 *value);
> +int ele_ping(void);
> +int ele_get_info(phys_addr_t addr, u32 data_size);
> +int ele_service_swap(phys_addr_t addr, u32 addr_size, u16 flag);
> +int ele_start_rng(void);
> +int ele_get_trng_state(void);
> +
> +#endif
> diff --git a/include/linux/firmware/imx/ele_fw_api.h
> b/include/linux/firmware/imx/ele_fw_api.h
> new file mode 100644
> index 000000000000..74108c7be4a8
> --- /dev/null
> +++ b/include/linux/firmware/imx/ele_fw_api.h
> @@ -0,0 +1,19 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * Copyright 2023 NXP
> + */
> +
> +#ifndef ELE_FW_API_H
> +#define ELE_FW_API_H
> +
> +#include <linux/hw_random.h>
> +
> +#define MESSAGING_VERSION_7 0x7
> +
> +#define ELE_INIT_FW_REQ 0x17
> +#define ELE_GET_RANDOM_REQ 0xCD
> +
> +int ele_get_random(struct hwrng *rng, void *data, size_t len, bool wait);
> +int ele_init_fw(void);
> +
> +#endif /* ELE_FW_API_H */
> diff --git a/include/linux/firmware/imx/ele_mu_ioctl.h
> b/include/linux/firmware/imx/ele_mu_ioctl.h
> new file mode 100644
> index 000000000000..3ad93ded23ed
> --- /dev/null
> +++ b/include/linux/firmware/imx/ele_mu_ioctl.h
> @@ -0,0 +1,52 @@
> +/* SPDX-License-Identifier: (GPL-2.0 WITH Linux-syscall-note) OR BSD-3-
> Clause*/
> +/*
> + * Copyright 2019-2022 NXP
> + */
> +
> +#ifndef ELE_MU_IOCTL_H
> +#define ELE_MU_IOCTL_H
> +
> +/* IOCTL definitions. */
> +
> +struct ele_mu_ioctl_setup_iobuf {
> + u8 *user_buf;
> + u32 length;
> + u32 flags;
> + u64 ele_addr;
> +};
> +
> +struct ele_mu_ioctl_shared_mem_cfg {
> + u32 base_offset;
> + u32 size;
> +};
> +
> +struct ele_mu_ioctl_get_mu_info {
> + u8 ele_mu_id;
> + u8 interrupt_idx;
> + u8 tz;
> + u8 did;
> +};
> +
> +struct ele_mu_ioctl_signed_message {
> + u8 *message;
> + u32 msg_size;
> + u32 error_code;
> +};
> +
> +#define ELE_MU_IO_FLAGS_IS_OUTPUT (0x00u)
> +#define ELE_MU_IO_FLAGS_IS_INPUT (0x01u)
> +#define ELE_MU_IO_FLAGS_USE_SEC_MEM (0x02u)
> +#define ELE_MU_IO_FLAGS_USE_SHORT_ADDR (0x04u)
> +#define ELE_MU_IO_FLAGS_IS_IN_OUT (0x08u)
> +
> +#define ELE_MU_IOCTL 0x0A /* like MISC_MAJOR. */
> +#define ELE_MU_IOCTL_ENABLE_CMD_RCV _IO(ELE_MU_IOCTL, 0x01)
> +#define ELE_MU_IOCTL_SHARED_BUF_CFG _IOW(ELE_MU_IOCTL, 0x02, \
> + struct
> ele_mu_ioctl_shared_mem_cfg)
> +#define ELE_MU_IOCTL_SETUP_IOBUF _IOWR(ELE_MU_IOCTL, 0x03,
> \
> + struct ele_mu_ioctl_setup_iobuf)
> +#define ELE_MU_IOCTL_GET_MU_INFO _IOR(ELE_MU_IOCTL, 0x04, \
> + struct ele_mu_ioctl_get_mu_info)
> +#define ELE_MU_IOCTL_SIGNED_MESSAGE _IOWR(ELE_MU_IOCTL, 0x05,
> \
> + struct ele_mu_ioctl_signed_message)
> +#endif
> --
> 2.34.1

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