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Subject: [PATCH v2 5/5] soc: imx8: Add the SC SECVIO driver
Date:   Tue, 21 Jul 2020 17:20:35 +0200
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From: Franck LENORMAND <franck.lenormand@oss.nxp.com>

The SNVS is a hardware component in the imx8 SoC. One of its
function is to detect hardware attacks, in which case it creates
a SECurity VIOlation.

This patch adds the support for the reception of these secvio and
report it to the audit framework.

It also gives the possibility to perform custom processing when a
secvio is detected.

Signed-off-by: Franck LENORMAND <franck.lenormand@oss.nxp.com>
Reported-by: kernel test robot <lkp@intel.com>
---
 drivers/soc/imx/Kconfig                     |  10 +
 drivers/soc/imx/Makefile                    |   1 +
 drivers/soc/imx/secvio/Kconfig              |  10 +
 drivers/soc/imx/secvio/Makefile             |   3 +
 drivers/soc/imx/secvio/imx-secvio-audit.c   |  39 ++
 drivers/soc/imx/secvio/imx-secvio-debugfs.c | 379 ++++++++++++
 drivers/soc/imx/secvio/imx-secvio-sc-int.h  |  84 +++
 drivers/soc/imx/secvio/imx-secvio-sc.c      | 858 ++++++++++++++++++++++++++++
 include/soc/imx/imx-secvio-sc.h             | 177 ++++++
 9 files changed, 1561 insertions(+)
 create mode 100644 drivers/soc/imx/secvio/Kconfig
 create mode 100644 drivers/soc/imx/secvio/Makefile
 create mode 100644 drivers/soc/imx/secvio/imx-secvio-audit.c
 create mode 100644 drivers/soc/imx/secvio/imx-secvio-debugfs.c
 create mode 100644 drivers/soc/imx/secvio/imx-secvio-sc-int.h
 create mode 100644 drivers/soc/imx/secvio/imx-secvio-sc.c
 create mode 100644 include/soc/imx/imx-secvio-sc.h

diff --git a/drivers/soc/imx/Kconfig b/drivers/soc/imx/Kconfig
index a9370f4..6c1bc78 100644
--- a/drivers/soc/imx/Kconfig
+++ b/drivers/soc/imx/Kconfig
@@ -19,4 +19,14 @@ config SOC_IMX8M
 	  support, it will provide the SoC info like SoC family,
 	  ID and revision etc.
 
+config SECVIO_SC
+        tristate "NXP SC secvio support"
+        depends on IMX_SCU
+        help
+           If you say yes here you get support for the NXP SNVS security
+           violation module. It includes the possibility to read information
+           related to security violations and tampers. It also gives the
+           possibility to register user callbacks when a security violation
+           occurs.
+
 endmenu
diff --git a/drivers/soc/imx/Makefile b/drivers/soc/imx/Makefile
index 078dc91..c91a499 100644
--- a/drivers/soc/imx/Makefile
+++ b/drivers/soc/imx/Makefile
@@ -5,3 +5,4 @@ endif
 obj-$(CONFIG_HAVE_IMX_GPC) += gpc.o
 obj-$(CONFIG_IMX_GPCV2_PM_DOMAINS) += gpcv2.o
 obj-$(CONFIG_SOC_IMX8M) += soc-imx8m.o
+obj-${CONFIG_SECVIO_SC} += secvio/
diff --git a/drivers/soc/imx/secvio/Kconfig b/drivers/soc/imx/secvio/Kconfig
new file mode 100644
index 0000000..dcfaea5
--- /dev/null
+++ b/drivers/soc/imx/secvio/Kconfig
@@ -0,0 +1,10 @@
+config SECVIO_SC
+        tristate "NXP SC secvio support"
+        depends on IMX_SCU
+        help
+           If you say yes here you get support for the NXP SNVS security
+           violation module. It includes the possibility to read information
+           related to security violations and tampers. It also gives the
+           possibility to register user callbacks when a security violation
+           occurs.
+
diff --git a/drivers/soc/imx/secvio/Makefile b/drivers/soc/imx/secvio/Makefile
new file mode 100644
index 0000000..d5a89ba
--- /dev/null
+++ b/drivers/soc/imx/secvio/Makefile
@@ -0,0 +1,3 @@
+obj-y +=  imx-secvio-sc.o
+obj-$(CONFIG_DEBUG_FS) += imx-secvio-debugfs.o
+obj-$(CONFIG_AUDIT) += imx-secvio-audit.o
diff --git a/drivers/soc/imx/secvio/imx-secvio-audit.c b/drivers/soc/imx/secvio/imx-secvio-audit.c
new file mode 100644
index 0000000..dc96e16
--- /dev/null
+++ b/drivers/soc/imx/secvio/imx-secvio-audit.c
@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2019-2020 NXP
+ */
+
+#include <linux/audit.h>
+
+#include <soc/imx/imx-secvio-sc.h>
+
+/**
+ * report_to_audit_notify() - Report secvio and tamper status to audit FW
+ *
+ * This function can be chained in a notifier list
+ *
+ * @nb: notifier block
+ * @status: error code
+ * @notif_info: Pointer on secvio_sc_notifier_info structure
+ *
+ * Return:
+ * 0 - OK
+ * < 0 - error.
+ */
+int report_to_audit_notify(struct notifier_block *nb, unsigned long status,
+			   void *notif_info)
+{
+	struct audit_buffer *ab;
+	struct secvio_sc_notifier_info *info = notif_info;
+
+	ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_INTEGRITY_RULE);
+	if (!ab)
+		return -ENOMEM;
+
+	audit_log_format(ab, " hpsvs=0x%.08x lps=0x%.08x lptds=0x%.08x",
+			 info->hpsvs, info->lps, info->lptds);
+	audit_log_task_info(ab);
+	audit_log_end(ab);
+
+	return 0;
+}
diff --git a/drivers/soc/imx/secvio/imx-secvio-debugfs.c b/drivers/soc/imx/secvio/imx-secvio-debugfs.c
new file mode 100644
index 0000000..bcbd77a
--- /dev/null
+++ b/drivers/soc/imx/secvio/imx-secvio-debugfs.c
@@ -0,0 +1,379 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2019-2020 NXP
+ */
+
+/*
+ * The module exposes 3 files in debugfs:
+ *  - secvio/info:
+ *      * Read: It returns the value of the fuses and SNVS registers which are
+ *              readable and related to secvio and tampers
+ *      * Write: A write of the format "<hex id> [<hex value 0> <hex value 1>
+ *               <hex value 2> <hex value 3> <hex value 4>](<nb values>)"
+ *               will write the SNVS register having the provided id with the
+ *               values provided (cf SECO documentation)
+ *  - secvio/enable: State of the IRQ
+ *  - secvio/check: Check the state of the security violation and tampers
+ *                  and calls notifier
+ *  - secvio/clear: Clear the state of all secvio and tampers
+ */
+
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/debugfs.h>
+#include <linux/uaccess.h>
+#include <linux/nvmem-consumer.h>
+
+#include <linux/firmware/imx/svc/misc.h>
+#include <linux/firmware/imx/svc/seco.h>
+
+#include <soc/imx/imx-secvio-sc.h>
+#include "imx-secvio-sc-int.h"
+
+/**
+ * fuse_reader() - Read a set of fuse
+ *
+ * @dev: secvio device
+ * @id: offset of the fuse
+ * @value: array of values read
+ * @mul: number of fuse to read
+ *
+ * Return:
+ * 0 - OK
+ * < 0 - error.
+ */
+static int fuse_reader(struct device *dev, u32 id, u32 *value, u8 mul)
+{
+	struct imx_secvio_sc_data *data = dev_get_drvdata(dev);
+	u32 size_to_read = mul * sizeof(u32);
+	int ret;
+
+	ret = nvmem_device_read(data->nvmem, id, size_to_read, value);
+	if (ret < 0) {
+		dev_err(data->dev, "Failed to read fuse %d: %d\n", id, ret);
+		return ret;
+	}
+
+	if (ret != size_to_read) {
+		dev_err(data->dev, "Read only %d instead of %d\n", ret,
+			size_to_read);
+		return -ENOMEM;
+	}
+
+	return 0;
+}
+
+/**
+ * snvs_reader() - Read a set of SNVS register
+ *
+ * @dev: secvio device
+ * @id: offset of the register
+ * @value: array of values read
+ * @mul: number of registers to read
+ *
+ * Return:
+ * 0 - OK
+ * < 0 - error.
+ */
+static int snvs_reader(struct device *dev, u32 id, u32 *value, u8 mul)
+{
+	int ret;
+	u32 *v1, *v2, *v3, *v4, *v5;
+
+	v1 = NULL;
+	v2 = NULL;
+	v3 = NULL;
+	v4 = NULL;
+	v5 = NULL;
+
+	switch (mul) {
+	case 5:
+		v5 = &value[4];
+		fallthrough;
+	case 4:
+		v4 = &value[3];
+		fallthrough;
+	case 3:
+		v3 = &value[2];
+		fallthrough;
+	case 2:
+		v2 = &value[1];
+		fallthrough;
+	case 1:
+		v1 = &value[0];
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	ret = call_secvio_config(dev, id, SECVIO_CONFIG_READ, v1, v2, v3, v4,
+				 v5, mul);
+	if (ret < 0)
+		dev_err(dev, "Failed to read snvs reg %d: %d\n", id, ret);
+
+	return ret;
+}
+
+/**
+ * snvs_dgo_reader() - Read a set of DGO register
+ *
+ * @dev: secvio device
+ * @id: offset of the register
+ * @value: array of values read
+ * @mul: number of registers to read
+ *
+ * Return:
+ * 0 - OK
+ * < 0 - error.
+ */
+static int snvs_dgo_reader(struct device *dev, u32 id, u32 *value, u8 mul)
+{
+	struct imx_secvio_sc_data *data = dev_get_drvdata(dev);
+	int ret;
+
+	/* We check that we only have 1 register to read */
+	if (mul != 1)
+		return -EINVAL;
+
+	ret = imx_sc_seco_secvio_dgo_config(data->ipc_handle, id,
+					    SECVIO_CONFIG_READ, value);
+	if (ret)
+		dev_err(dev, "Failed to read snvs dgo reg %d: %d\n", id, ret);
+
+	return ret;
+}
+
+static const struct imx_secvio_info_entry {
+	int (*reader)(struct device *dev, u32 id, u32 *value, u8 mul);
+	const char *type;
+	const char *name;
+	u32 id;
+	u8 mul;
+} gs_imx_secvio_info_list[] = {
+	{fuse_reader, "fuse", "trim", 30, 1},
+	{fuse_reader, "fuse", "trim2", 31, 1},
+	{fuse_reader, "fuse", "ctrim1", 260, 1},
+	{fuse_reader, "fuse", "ctrim2", 261, 1},
+	{fuse_reader, "fuse", "ctrim3", 262, 1},
+	{fuse_reader, "fuse", "ctrim4", 263, 1},
+	{fuse_reader, "fuse", "OSC_CAP", 768, 1},
+
+	{snvs_reader, "snvs", "HPLR",    0x0, 1},
+	{snvs_reader, "snvs", "LPLR",    0x34, 1},
+	{snvs_reader, "snvs", "HPSICR",  0xc, 1},
+	{snvs_reader, "snvs", "HPSVCR",  0x10, 1},
+	{snvs_reader, "snvs", "HPSVS",   0x18, 1},
+	{snvs_reader, "snvs", "LPSVC",   0x40, 1},
+	{snvs_reader, "snvs", "LPTDC",   0x48, 2},
+	{snvs_reader, "snvs", "LPSR",    0x4c, 1},
+	{snvs_reader, "snvs", "LPTDS",   0xa4, 1},
+	{snvs_reader, "snvs", "LPTGFC",  0x44, 3},
+	{snvs_reader, "snvs", "LPATCTL", 0xe0, 1},
+	{snvs_reader, "snvs", "LPATCLK", 0xe4, 1},
+	{snvs_reader, "snvs", "LPATRC1", 0xe8, 2},
+	{snvs_reader, "snvs", "LPMKC",   0x3c, 1},
+	{snvs_reader, "snvs", "LPSMC",   0x5c, 2},
+	{snvs_reader, "snvs", "LPPGD",   0x64, 1},
+	{snvs_reader, "snvs", "HPVID",   0xf8, 2},
+
+	{snvs_dgo_reader, "dgo", "Offset",  0x0, 1},
+	{snvs_dgo_reader, "dgo", "PUP/PD",  0x10, 1},
+	{snvs_dgo_reader, "dgo", "Anatest", 0x20, 1},
+	{snvs_dgo_reader, "dgo", "T trim",  0x30, 1},
+	{snvs_dgo_reader, "dgo", "Misc",    0x40, 1},
+	{snvs_dgo_reader, "dgo", "Vmon",    0x50, 1},
+};
+
+struct imx_secvio_sc_info_seq_data {
+	struct device *dev;
+	const struct imx_secvio_info_entry *list;
+	int size;
+};
+
+/**
+ * imx_secvio_sc_info_seq_start() - Start sequence
+ *
+ * @m: seq file
+ * @pos: position in the sequence
+ *
+ * Return pointer on position
+ */
+static void *imx_secvio_sc_info_seq_start(struct seq_file *m, loff_t *pos)
+{
+	struct imx_secvio_sc_info_seq_data *data = m->private;
+
+	/* Check we are not out of bound */
+	if (*pos >= data->size)
+		return NULL;
+
+	return (void *)pos;
+}
+
+/**
+ * imx_secvio_sc_info_seq_next() - Iterate sequence
+ *
+ * @m: seq file
+ * @v: pointer
+ * @pos: position in the sequence
+ *
+ * Return pointer on position
+ */
+static void *imx_secvio_sc_info_seq_next(struct seq_file *m, void *v, loff_t *pos)
+{
+	/* Increment the counter */
+	++*pos;
+
+	/* call the start function which will check the index */
+	return imx_secvio_sc_info_seq_start(m, pos);
+}
+
+/**
+ * imx_secvio_sc_info_seq_stop() - Stop sequence
+ *
+ * @m: seq file
+ * @v: pointer
+ */
+static void imx_secvio_sc_info_seq_stop(struct seq_file *m, void *v)
+{
+}
+
+/**
+ * imx_secvio_sc_info_seq_show() - Show the item in the sequence
+ *
+ * @m: seq file
+ * @v: pointer
+ * @pos: position in the sequence
+ *
+ * Return:
+ * 0 - OK
+ * < 0 - error.
+ */
+static int imx_secvio_sc_info_seq_show(struct seq_file *m, void *v)
+{
+	struct imx_secvio_sc_info_seq_data *data = m->private;
+	const struct imx_secvio_info_entry *e;
+	int ret;
+	u32 vals[5];
+	int idx;
+
+	idx = *(loff_t *)v;
+	e = &data->list[idx];
+
+	/* Read the values */
+	ret = e->reader(data->dev, e->id, (u32 *)&vals, e->mul);
+	if (ret) {
+		dev_err(data->dev, "Fail to read %s %s (idx %d)\n", e->type,
+			e->name, e->id);
+		return 0;
+	}
+
+	seq_printf(m, "%5s/%-10s(%.3d):", e->type, e->name, e->id);
+
+	/* Loop over the values */
+	for (idx = 0; idx < e->mul; idx++)
+		seq_printf(m, " %.8x", vals[idx]);
+
+	seq_puts(m, "\n");
+
+	return 0;
+}
+
+static const struct seq_operations imx_secvio_sc_info_seq_ops = {
+	.start = imx_secvio_sc_info_seq_start,
+	.next  = imx_secvio_sc_info_seq_next,
+	.stop  = imx_secvio_sc_info_seq_stop,
+	.show  = imx_secvio_sc_info_seq_show,
+};
+
+/**
+ * imx_secvio_sc_info_open() - Store node info for ioctl
+ *
+ * @inode: inode
+ * @file: file used to perform the ioctl
+ *
+ * Return:
+ * 0 - OK
+ * < 0 - error.
+ */
+static int imx_secvio_sc_info_open(struct inode *inode, struct file *file)
+{
+	struct imx_secvio_sc_info_seq_data *data;
+
+	data = __seq_open_private(file, &imx_secvio_sc_info_seq_ops, sizeof(*data));
+	if (!data)
+		return -ENOMEM;
+
+	data->dev = inode->i_private;
+	data->list = gs_imx_secvio_info_list;
+	data->size = ARRAY_SIZE(gs_imx_secvio_info_list);
+
+	return 0;
+}
+
+static const struct file_operations imx_secvio_sc_info_ops = {
+	.owner = THIS_MODULE,
+	.open = imx_secvio_sc_info_open,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = seq_release_private,
+};
+
+/**
+ * if_debugfs_remove_recursive() - Wrapper for debugfs_remove_recursive
+ *
+ * Can be used with devm
+ *
+ * @dentry: directory entry
+ */
+static void if_debugfs_remove_recursive(void *dentry)
+{
+	debugfs_remove_recursive(dentry);
+}
+
+/**
+ * imx_secvio_sc_debugfs() - Create the debugfs
+ *
+ * @dev: secvio device
+ *
+ * Return:
+ * 0 - OK
+ * < 0 - error.
+ */
+int imx_secvio_sc_debugfs(struct device *dev)
+{
+	struct imx_secvio_sc_data *data = dev_get_drvdata(dev);
+	struct dentry *dir;
+	int ret = 0;
+
+	/* Create a folder */
+	dir = debugfs_create_dir(dev_name(dev), NULL);
+	if (IS_ERR(dir)) {
+		dev_err(dev, "Failed to create dfs dir\n");
+		ret = PTR_ERR(dir);
+		goto exit;
+	}
+	data->dfs = dir;
+
+	ret = devm_add_action(dev, if_debugfs_remove_recursive, data->dfs);
+	if (ret) {
+		dev_err(dev, "Failed to add managed action to disable IRQ\n");
+		goto remove_fs;
+	}
+
+	/* Create the file to read info and write to reg */
+	dir = debugfs_create_file("info", 0x666, data->dfs, dev,
+				  &imx_secvio_sc_info_ops);
+	if (IS_ERR(dir)) {
+		dev_err(dev, "Failed to add info to debugfs\n");
+		ret = PTR_ERR(dir);
+		goto exit;
+	}
+
+	goto exit;
+
+remove_fs:
+	debugfs_remove_recursive(data->dfs);
+
+exit:
+	return ret;
+}
diff --git a/drivers/soc/imx/secvio/imx-secvio-sc-int.h b/drivers/soc/imx/secvio/imx-secvio-sc-int.h
new file mode 100644
index 0000000..54de7fa
--- /dev/null
+++ b/drivers/soc/imx/secvio/imx-secvio-sc-int.h
@@ -0,0 +1,84 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright 2019-2020 NXP
+ */
+
+#ifndef SECVIO_SC_H
+#define SECVIO_SC_H
+
+/* Includes */
+#include <linux/kernel.h>
+#include <linux/notifier.h>
+#include <linux/semaphore.h>
+#include <linux/nvmem-consumer.h>
+#include <linux/miscdevice.h>
+
+/* Access for sc_seco_secvio_config API */
+#define SECVIO_CONFIG_READ  0
+#define SECVIO_CONFIG_WRITE 1
+
+/* Internal Structure */
+struct imx_secvio_sc_data {
+	struct device *dev;
+
+	struct imx_sc_ipc *ipc_handle;
+
+	struct notifier_block irq_nb;
+	struct notifier_block report_nb;
+	struct notifier_block audit_nb;
+
+	struct nvmem_device *nvmem;
+
+	struct miscdevice miscdev;
+
+#ifdef CONFIG_DEBUG_FS
+	struct dentry *dfs;
+#endif
+
+	u32 version;
+};
+
+/**
+ * call_secvio_config() - Wrapper for imx_sc_seco_secvio_config()
+ *
+ * @dev: secvio device
+ * @id: ID of the register, ie the offset of the first register of the set
+ * @access: Write (1) or Read (0) the registers
+ * @data0: Data for the first register
+ * @data1: Data for the second register
+ * @data2: Data for the third register
+ * @data3: Data for the fourth register
+ * @data4: Data for the fifth register
+ * @size: Number of register to configure
+ *
+ * Return:
+ * 0 - OK
+ * < 0 - error.
+ */
+int call_secvio_config(struct device *dev, u8 id, u8 access, u32 *data0,
+		       u32 *data1, u32 *data2, u32 *data3, u32 *data4, u8 size);
+
+#ifdef CONFIG_DEBUG_FS
+extern
+int imx_secvio_sc_debugfs(struct device *dev);
+#else
+static inline
+int imx_secvio_sc_debugfs(struct device *dev)
+{
+	return 0;
+}
+#endif /* CONFIG_DEBUG_FS */
+
+#ifdef CONFIG_AUDIT
+int report_to_audit_notify(struct notifier_block *nb, unsigned long status,
+			   void *notif_info);
+#else /* CONFIG_AUDIT */
+static inline
+int report_to_audit_notify(struct notifier_block *nb, unsigned long status,
+			   void *notif_info)
+{
+	return 0;
+}
+#endif /* CONFIG_AUDIT */
+
+#endif /* SECVIO_SC_H */
diff --git a/drivers/soc/imx/secvio/imx-secvio-sc.c b/drivers/soc/imx/secvio/imx-secvio-sc.c
new file mode 100644
index 0000000..1e0d6aa
--- /dev/null
+++ b/drivers/soc/imx/secvio/imx-secvio-sc.c
@@ -0,0 +1,858 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2019-2020 NXP
+ */
+
+/*
+ * The SoC of the i.MX8 family contains a hardware block called SNVS
+ * (Secure Non-Volatile Storage).
+ *
+ * The i.MX8 (QM/QXP/DXL) SoC contains the  (SNVS) block. This
+ * block can detect specific hardware attacks. Due to the presence of the SECO,
+ * this block can only be accessible using the SCFW API.
+ *
+ * This module interacts with the SCU which relays request to/from the SNVS block
+ * to detect if security violation occurred.
+ *
+ * The module exports an API to add processing when a SV is detected:
+ *  - register_imx_secvio_sc_notifier
+ *  - unregister_imx_secvio_sc_notifier
+ *  - imx_secvio_sc_check_state
+ *  - int_imx_secvio_sc_clear_state
+ *  - imx_secvio_sc_enable_irq
+ *  - imx_secvio_sc_disable_irq
+ */
+
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/notifier.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/uaccess.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/nvmem-consumer.h>
+#include <linux/miscdevice.h>
+
+#include <linux/firmware/imx/ipc.h>
+#include <linux/firmware/imx/sci.h>
+#include <linux/firmware/imx/svc/seco.h>
+#include <linux/firmware/imx/svc/rm.h>
+#include <dt-bindings/firmware/imx/rsrc.h>
+
+#include <soc/imx/imx-secvio-sc.h>
+#include "imx-secvio-sc-int.h"
+
+/* Definitions */
+static int int_imx_secvio_sc_enable_irq(struct device *dev);
+static int int_imx_secvio_sc_disable_irq(struct device *dev);
+
+/* Reference on the driver_device */
+static struct device *gs_imx_secvio_sc_dev;
+
+/* Register IDs for sc_seco_secvio_config API */
+#define HPSVS_ID 0x18
+#define LPS_ID 0x4c
+#define LPTDS_ID 0xa4
+#define HPVIDR_ID 0xf8
+
+#define SECO_MINOR_VERSION_SUPPORT_SECVIO_TAMPER 0x53
+#define SECO_VERSION_MINOR_MASK GENMASK(15, 0)
+
+/* Notifier list for new CB */
+static BLOCKING_NOTIFIER_HEAD(imx_secvio_sc_notifier_chain);
+
+/**
+ * register_imx_secvio_sc_notifier() - Add function to secvio call chain
+ *
+ * @nb: notifier block of the function to add
+ *
+ * Return:
+ * 0 - OK
+ * < 0 - error.
+ */
+int register_imx_secvio_sc_notifier(struct notifier_block *nb)
+{
+	return blocking_notifier_chain_register(&imx_secvio_sc_notifier_chain,
+						nb);
+}
+EXPORT_SYMBOL(register_imx_secvio_sc_notifier);
+
+/**
+ * unregister_imx_secvio_sc_notifier() - Remove function to secvio call chain
+ *
+ * @nb: notifier block of the function to add
+ *
+ * Return:
+ * 0 - OK
+ * < 0 - error.
+ */
+int unregister_imx_secvio_sc_notifier(struct notifier_block *nb)
+{
+	return blocking_notifier_chain_unregister(&imx_secvio_sc_notifier_chain,
+						  nb);
+}
+EXPORT_SYMBOL(unregister_imx_secvio_sc_notifier);
+
+/**
+ * if_imx_scu_irq_register_notifier() - Wrapper for imx_scu_irq_register_notifier
+ *
+ * Can be used for devm actions
+ *
+ * @nb: notifier block of the function to add
+ */
+static void if_unregister_imx_secvio_sc_notifier(void *nb)
+{
+	unregister_imx_secvio_sc_notifier(nb);
+}
+
+/**
+ * imx_secvio_sc_notifier_call_chain() - Call secvio notifier chain
+ *
+ * @info: The structure containing the info to pass to notified functions
+ *
+ * Return:
+ * 0 - OK
+ * < 0 - error.
+ */
+static
+int imx_secvio_sc_notifier_call_chain(struct secvio_sc_notifier_info *info)
+{
+	return blocking_notifier_call_chain(&imx_secvio_sc_notifier_chain, 0,
+					    (void *)info);
+}
+
+int call_secvio_config(struct device *dev, u8 id, u8 access, u32 *data0,
+		       u32 *data1, u32 *data2, u32 *data3, u32 *data4, u8 size)
+{
+	int ret = 0;
+	struct imx_secvio_sc_data *data;
+
+	data = dev_get_drvdata(dev);
+
+	ret = imx_sc_seco_secvio_config(data->ipc_handle, id, access, data0,
+					data1, data2, data3, data4, size);
+	if (ret)
+		dev_err(dev, "Fail %s secvio config %d",
+			((access) ? "write" : "read"), ret);
+
+	return ret;
+}
+
+/**
+ * int_imx_secvio_sc_get_state() - Get the state of secvio and tamper
+ *
+ * @dev: secvio device
+ * @info: The structure to use to store the status
+ *
+ * Return:
+ * 0 - OK
+ * < 0 - error.
+ */
+static int int_imx_secvio_sc_get_state(struct device *dev,
+				       struct secvio_sc_notifier_info *info)
+{
+	struct secvio_sc_notifier_info _info = {0};
+	struct secvio_sc_notifier_info *p_info;
+	int ret = 0, ret2 = 0;
+
+	p_info = info ? info : &_info;
+
+	/* Read secvio status */
+	ret = call_secvio_config(dev, HPSVS_ID, SECVIO_CONFIG_READ,
+				 &p_info->hpsvs, NULL, NULL, NULL, NULL, 1);
+	if (ret) {
+		ret2 = ret;
+		dev_warn(dev, "Cannot read secvio status: %d\n", ret);
+	}
+	p_info->hpsvs &= HPSVS__ALL_SV__MASK;
+
+	/* Read tampers status */
+	ret = call_secvio_config(dev, LPS_ID, SECVIO_CONFIG_READ,
+				 &p_info->lps, NULL, NULL, NULL, NULL, 1);
+	if (ret) {
+		ret2 = ret;
+		dev_warn(dev, "Cannot read tamper 1 status: %d\n", ret);
+	}
+	p_info->lps &= LPS__ALL_TP__MASK;
+
+	ret = call_secvio_config(dev, LPTDS_ID, SECVIO_CONFIG_READ,
+				 &p_info->lptds, NULL, NULL, NULL, NULL, 1);
+	if (ret) {
+		ret2 = ret;
+		dev_warn(dev, "Cannot read  tamper 2 status: %d\n", ret);
+	}
+	p_info->lptds &= LPTDS__ALL_TP__MASK;
+
+	dev_dbg(dev, "Status: %.8x, %.8x, %.8x\n", p_info->hpsvs,
+		p_info->lps, p_info->lptds);
+
+	return ret2;
+}
+
+/**
+ * imx_secvio_sc_get_state() - Wrapper for int_imx_secvio_sc_get_state
+ *
+ * Return:
+ * 0 - OK
+ * < 0 - error.
+ */
+inline int imx_secvio_sc_get_state(struct secvio_sc_notifier_info *info)
+{
+	if (!gs_imx_secvio_sc_dev)
+		return -EOPNOTSUPP;
+
+	return int_imx_secvio_sc_get_state(gs_imx_secvio_sc_dev, info);
+}
+EXPORT_SYMBOL(imx_secvio_sc_get_state);
+
+/**
+ * int_imx_secvio_sc_check_state() - Get the state and call chain of notifier
+ * if there is a status
+ *
+ * @dev: secvio device
+ *
+ * Return:
+ * 0 - OK
+ * < 0 - error.
+ */
+static int int_imx_secvio_sc_check_state(struct device *dev)
+{
+	struct secvio_sc_notifier_info info = {0};
+	int ret = 0;
+
+	ret = int_imx_secvio_sc_get_state(dev, &info);
+	if (ret) {
+		dev_err(dev, "Failed to get secvio state\n");
+		goto exit;
+	}
+
+	/* Call chain of CB registered to this module if status detected */
+	if (info.hpsvs || info.lps || info.lptds)
+		if (imx_secvio_sc_notifier_call_chain(&info))
+			dev_warn(dev,
+				 "Issues when calling the notifier chain\n");
+
+exit:
+	return ret;
+}
+
+/**
+ * imx_secvio_sc_check_state() - Wrapper for int_imx_secvio_sc_check_state
+ *
+ * Return:
+ * 0 - OK
+ * < 0 - error.
+ */
+inline int imx_secvio_sc_check_state(void)
+{
+	if (!gs_imx_secvio_sc_dev)
+		return -EOPNOTSUPP;
+
+	return int_imx_secvio_sc_check_state(gs_imx_secvio_sc_dev);
+}
+EXPORT_SYMBOL(imx_secvio_sc_check_state);
+
+/**
+ * imx_secvio_sc_notify() - Process event from SCU
+ *
+ * If the event is secvio we check the state, then
+ * re-enable the IRQ which has been disabled by SCU
+ *
+ * @nb: secvio device
+ * @event: The id of the IRQ received in a group
+ * @group: The group of the IRQ
+ *
+ * Return:
+ * 0 - OK
+ * < 0 - error.
+ */
+static int imx_secvio_sc_notify(struct notifier_block *nb,
+				unsigned long event, void *group)
+{
+	struct imx_secvio_sc_data *data =
+				container_of(nb, struct imx_secvio_sc_data,
+					     irq_nb);
+	struct device *dev = data->dev;
+	int ret = 0;
+
+	/* Filter event for us */
+	if (!((event & IMX_SC_IRQ_SECVIO) &&
+	      (*(u8 *)group == IMX_SC_IRQ_GROUP_WAKE)))
+		goto exit;
+
+	dev_warn(dev, "secvio security violation detected\n");
+
+	ret = int_imx_secvio_sc_check_state(dev);
+
+	/* Re-enable interrupt */
+	ret = int_imx_secvio_sc_enable_irq(dev);
+	if (ret)
+		dev_err(dev, "Failed to enable IRQ\n");
+
+exit:
+	return ret;
+}
+
+/**
+ * int_imx_secvio_sc_clear_state() - Clear secvio and tamper state
+ *
+ * @dev: secvio device
+ * @hpsvs: high power security violation status to clear
+ * @lps: low power status to clear
+ * @lptds: low power tamper detector status to clear
+ *
+ * Return:
+ * 0 - OK
+ * < 0 - error.
+ */
+static int int_imx_secvio_sc_clear_state(struct device *dev, u32 hpsvs, u32 lps,
+					 u32 lptds)
+{
+	int ret = 0;
+
+	ret = call_secvio_config(dev, HPSVS_ID, SECVIO_CONFIG_WRITE, &hpsvs,
+				 NULL, NULL, NULL, NULL, 1);
+	if (ret) {
+		dev_err(dev, "Cannot clear secvio status: %d\n", ret);
+		goto exit;
+	}
+
+	ret = call_secvio_config(dev, LPS_ID, SECVIO_CONFIG_WRITE, &lps, NULL,
+				 NULL, NULL, NULL, 1);
+	if (ret) {
+		dev_err(dev, "Cannot clear tamper 1 status: %d\n", ret);
+		goto exit;
+	}
+
+	ret = call_secvio_config(dev, LPTDS_ID, SECVIO_CONFIG_WRITE, &lptds,
+				 NULL, NULL, NULL, NULL, 1);
+	if (ret) {
+		dev_err(dev, "Cannot clear tamper 2 status: %d\n", ret);
+		goto exit;
+	}
+
+exit:
+	return ret;
+}
+
+/**
+ * imx_secvio_sc_clear_state() - Wrapper for imx_secvio_sc_clear_state
+ *
+ * @hpsvs: high power security violation status to clear
+ * @lps: low power status to clear
+ * @lptds: low power tamper detector status to clear
+ *
+ * Return:
+ * 0 - OK
+ * < 0 - error.
+ */
+inline int imx_secvio_sc_clear_state(u32 hpsvs, u32 lps, u32 lptds)
+{
+	if (!gs_imx_secvio_sc_dev)
+		return -EOPNOTSUPP;
+
+	return int_imx_secvio_sc_clear_state(gs_imx_secvio_sc_dev, hpsvs, lps,
+					     lptds);
+}
+EXPORT_SYMBOL(imx_secvio_sc_clear_state);
+
+/**
+ * report_to_user_notify() - Print to console the status
+ *
+ * @nb: notifier block
+ * @status: error code
+ * @notif_info: Pointer on structure containing the status of the secvio and
+ * tampers
+ *
+ * Return:
+ * 0 - OK
+ */
+static int report_to_user_notify(struct notifier_block *nb,
+				 unsigned long status, void *notif_info)
+{
+	struct secvio_sc_notifier_info *info = notif_info;
+	struct imx_secvio_sc_data *data =
+				container_of(nb, struct imx_secvio_sc_data,
+					     report_nb);
+	struct device *dev = data->dev;
+
+	/* Information about the security violation */
+	if (info->hpsvs & HPSVS__LP_SEC_VIO__MASK)
+		dev_info(dev, "SNVS secvio: LPSV\n");
+	if (info->hpsvs & HPSVS__SW_LPSV__MASK)
+		dev_info(dev, "SNVS secvio: SW LPSV\n");
+	if (info->hpsvs & HPSVS__SW_FSV__MASK)
+		dev_info(dev, "SNVS secvio: SW FSV\n");
+	if (info->hpsvs & HPSVS__SW_SV__MASK)
+		dev_info(dev, "SNVS secvio: SW SV\n");
+	if (info->hpsvs & HPSVS__SV5__MASK)
+		dev_info(dev, "SNVS secvio: SV 5\n");
+	if (info->hpsvs & HPSVS__SV4__MASK)
+		dev_info(dev, "SNVS secvio: SV 4\n");
+	if (info->hpsvs & HPSVS__SV3__MASK)
+		dev_info(dev, "SNVS secvio: SV 3\n");
+	if (info->hpsvs & HPSVS__SV2__MASK)
+		dev_info(dev, "SNVS secvio: SV 2\n");
+	if (info->hpsvs & HPSVS__SV1__MASK)
+		dev_info(dev, "SNVS secvio: SV 1\n");
+	if (info->hpsvs & HPSVS__SV0__MASK)
+		dev_info(dev, "SNVS secvio: SV 0\n");
+
+	/* Information about the tampers */
+	if (info->lps & LPS__ESVD__MASK)
+		dev_info(dev, "SNVS tamper: External SV\n");
+	if (info->lps & LPS__ET2D__MASK)
+		dev_info(dev, "SNVS tamper: Tamper 2\n");
+	if (info->lps & LPS__ET1D__MASK)
+		dev_info(dev, "SNVS tamper: Tamper 1\n");
+	if (info->lps & LPS__WMT2D__MASK)
+		dev_info(dev, "SNVS tamper: Wire Mesh 2\n");
+	if (info->lps & LPS__WMT1D__MASK)
+		dev_info(dev, "SNVS tamper: Wire Mesh 1\n");
+	if (info->lps & LPS__VTD__MASK)
+		dev_info(dev, "SNVS tamper: Voltage\n");
+	if (info->lps & LPS__TTD__MASK)
+		dev_info(dev, "SNVS tamper: Temperature\n");
+	if (info->lps & LPS__CTD__MASK)
+		dev_info(dev, "SNVS tamper: Clock\n");
+	if (info->lps & LPS__PGD__MASK)
+		dev_info(dev, "SNVS tamper: Power Glitch\n");
+	if (info->lps & LPS__MCR__MASK)
+		dev_info(dev, "SNVS tamper: Monotonic Counter rollover\n");
+	if (info->lps & LPS__SRTCR__MASK)
+		dev_info(dev, "SNVS tamper: Secure RTC rollover\n");
+	if (info->lps & LPS__LPTA__MASK)
+		dev_info(dev, "SNVS tamper: Time alarm\n");
+
+	if (info->lptds & LPTDS__ET10D__MASK)
+		dev_info(dev, "SNVS tamper: Tamper 10\n");
+	if (info->lptds & LPTDS__ET9D__MASK)
+		dev_info(dev, "SNVS tamper: Tamper 9\n");
+	if (info->lptds & LPTDS__ET8D__MASK)
+		dev_info(dev, "SNVS tamper: Tamper 8\n");
+	if (info->lptds & LPTDS__ET7D__MASK)
+		dev_info(dev, "SNVS tamper: Tamper 7\n");
+	if (info->lptds & LPTDS__ET6D__MASK)
+		dev_info(dev, "SNVS tamper: Tamper 6\n");
+	if (info->lptds & LPTDS__ET5D__MASK)
+		dev_info(dev, "SNVS tamper: Tamper 5\n");
+	if (info->lptds & LPTDS__ET4D__MASK)
+		dev_info(dev, "SNVS tamper: Tamper 4\n");
+	if (info->lptds & LPTDS__ET3D__MASK)
+		dev_info(dev, "SNVS tamper: Tamper 3\n");
+
+	return 0;
+}
+
+/**
+ * int_imx_secvio_sc_enable_irq() - Enable the secvio IRQ in SCU
+ *
+ * @dev: secvio device
+ *
+ * Return:
+ * 0 - OK
+ * < 0 - error.
+ */
+static int int_imx_secvio_sc_enable_irq(struct device *dev)
+{
+	int ret = 0, ret2;
+	u32 irq_status;
+	struct imx_secvio_sc_data *data;
+
+	data = dev_get_drvdata(dev);
+
+	/* Enable the IRQ */
+	ret = imx_scu_irq_group_enable(IMX_SC_IRQ_GROUP_WAKE, IMX_SC_IRQ_SECVIO,
+				       true);
+	if (ret) {
+		dev_err(dev, "Cannot enable SCU IRQ: %d\n", ret);
+		goto exit;
+	}
+
+	/* Enable interrupt */
+	ret = imx_sc_seco_secvio_enable(data->ipc_handle);
+	if (ret) {
+		dev_err(dev, "Cannot enable SNVS irq: %d\n", ret);
+		goto exit;
+	};
+
+	/* Unmask interrupt */
+	ret = imx_scu_irq_get_status(IMX_SC_IRQ_GROUP_WAKE, &irq_status);
+	if (ret) {
+		dev_err(dev, "Cannot unmask irq: %d\n", ret);
+		goto exit;
+	};
+
+exit:
+	if (ret) {
+		ret2 = int_imx_secvio_sc_disable_irq(dev);
+		if (ret2)
+			dev_warn(dev, "Failed to disable the IRQ\n");
+	}
+
+	return ret;
+}
+
+/**
+ * int_imx_secvio_sc_disable_irq() - Disable secvio IRQ
+ *
+ * @dev: secvio device
+ *
+ * Return:
+ * 0 - OK
+ * < 0 - error.
+ */
+static int int_imx_secvio_sc_disable_irq(struct device *dev)
+{
+	int ret = 0;
+	struct imx_secvio_sc_data *data;
+
+	data = dev_get_drvdata(dev);
+
+	/* Disable the IRQ */
+	ret = imx_scu_irq_group_enable(IMX_SC_IRQ_GROUP_WAKE, IMX_SC_IRQ_SECVIO,
+				       false);
+	if (ret) {
+		dev_err(dev, "Cannot disable SCU IRQ: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+/**
+ * if_imx_secvio_sc_disable_irq() - Wrapper for int_imx_secvio_sc_disable_irq
+ *
+ * Can be used with devm
+ *
+ * @dev: secvio device
+ */
+static void if_imx_secvio_sc_disable_irq(void *dev)
+{
+	int_imx_secvio_sc_disable_irq(dev);
+}
+
+/**
+ * imx_secvio_sc_open() - Store node info for ioctl
+ *
+ * @node: inode
+ * @file: file used to perform the ioctl
+ *
+ * Return:
+ * 0 - OK
+ * < 0 - error.
+ */
+static int imx_secvio_sc_open(struct inode *node, struct file *filp)
+{
+	filp->private_data = node->i_private;
+
+	return 0;
+}
+
+/**
+ * imx_secvio_sc_ioctl() - IOCTL handler for the driver
+ *
+ * @file: file used to perform the ioctl
+ * @cmd: command to perform
+ * @arg: Pointer on structure with info for the command
+ *
+ * Return:
+ * 0 - OK
+ * < 0 - error.
+ */
+static long imx_secvio_sc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+	struct device *dev = file->private_data;
+	struct secvio_sc_notifier_info info;
+	int ret;
+
+	switch (cmd) {
+	case IMX_SECVIO_SC_GET_STATE:
+		ret = int_imx_secvio_sc_get_state(dev, &info);
+		if (ret) {
+			dev_err(dev, "Fail to get state\n");
+			goto exit;
+		}
+
+		ret = copy_to_user((void *)arg, &info, sizeof(info));
+		if (ret) {
+			dev_err(dev, "Fail to copy info to user\n");
+			ret = -EFAULT;
+			goto exit;
+		}
+		break;
+	case IMX_SECVIO_SC_CHECK_STATE:
+		ret = int_imx_secvio_sc_check_state(dev);
+		if (ret) {
+			dev_err(dev, "Fail to check state\n");
+			goto exit;
+		}
+		break;
+	case IMX_SECVIO_SC_CLEAR_STATE:
+		ret = copy_from_user(&info, (void *)arg, sizeof(info));
+		if (ret) {
+			dev_err(dev, "Fail to copy info from user\n");
+			ret = -EFAULT;
+			goto exit;
+		}
+
+		ret = int_imx_secvio_sc_clear_state(dev, info.hpsvs, info.lps,
+						    info.lptds);
+		if (ret) {
+			dev_err(dev, "Fail to clear state\n");
+			goto exit;
+		}
+		break;
+	default:
+		ret = -ENOIOCTLCMD;
+	}
+
+exit:
+	return ret;
+}
+
+const static struct file_operations imx_secvio_sc_fops = {
+	.owner = THIS_MODULE,
+	.open = imx_secvio_sc_open,
+	.unlocked_ioctl = imx_secvio_sc_ioctl,
+};
+
+static void if_misc_deregister(void *miscdevice)
+{
+	misc_deregister(miscdevice);
+}
+
+static void reset_global_dev(void *dev)
+{
+	gs_imx_secvio_sc_dev = NULL;
+}
+
+/**
+ * imx_secvio_sc_setup() - Configure the driver
+ *
+ * @dev: secvio device
+ *
+ * Return:
+ * 0 - OK
+ * < 0 - error.
+ */
+static int imx_secvio_sc_setup(struct device *dev)
+{
+	struct imx_secvio_sc_data *data;
+	u32 seco_version = 0;
+	bool own_secvio;
+	u32 irq_status;
+	int ret = 0;
+
+	if (!devres_open_group(dev, NULL, GFP_KERNEL)) {
+		ret = -ENOMEM;
+		goto exit;
+	}
+
+	/* Allocate private data */
+	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+	if (!data) {
+		ret = -ENOMEM;
+		dev_err(dev, "Failed to allocate mem for data\n");
+		goto clean;
+	}
+
+	data->dev = dev;
+
+	dev_set_drvdata(dev, data);
+
+	data->nvmem = devm_nvmem_device_get(dev, NULL);
+	if (IS_ERR(data->nvmem)) {
+		ret = PTR_ERR(data->nvmem);
+		if (ret != -EPROBE_DEFER)
+			dev_err(dev, "Failed to retrieve nvmem\n");
+
+		goto clean;
+	}
+
+	/* Get a handle */
+	ret = imx_scu_get_handle(&data->ipc_handle);
+	if (ret) {
+		dev_err(dev, "cannot get handle to scu: %d\n", ret);
+		goto clean;
+	};
+
+	/* Check the version of the SECO */
+	ret = imx_sc_seco_build_info(data->ipc_handle, &seco_version, NULL);
+	if (ret) {
+		dev_err(dev, "Failed to get seco version\n");
+		goto clean;
+	}
+
+	if ((seco_version & SECO_VERSION_MINOR_MASK) <
+	     SECO_MINOR_VERSION_SUPPORT_SECVIO_TAMPER) {
+		dev_err(dev, "SECO version %.8x doesn't support all secvio\n",
+			seco_version);
+		ret = -EOPNOTSUPP;
+		goto clean;
+	}
+
+	/* Init debug FS */
+	ret = imx_secvio_sc_debugfs(dev);
+	if (ret) {
+		dev_err(dev, "Failed to set debugfs\n");
+		goto clean;
+	}
+
+	/* Check we own the SECVIO */
+	ret = imx_sc_rm_is_resource_owned(data->ipc_handle, IMX_SC_R_SECVIO);
+	if (ret < 0) {
+		dev_err(dev, "Failed to retrieve secvio ownership\n");
+		goto clean;
+	}
+
+	own_secvio = ret > 0;
+	if (!own_secvio) {
+		dev_err(dev, "Secvio resource is not owned\n");
+		ret = -EPERM;
+		goto clean;
+	}
+
+	/* Check IRQ exists and enable it */
+	ret = imx_scu_irq_get_status(IMX_SC_IRQ_GROUP_WAKE, &irq_status);
+	if (ret) {
+		dev_err(dev, "Cannot get IRQ state: %d\n", ret);
+		goto clean;
+	}
+
+	ret = int_imx_secvio_sc_enable_irq(dev);
+	if (ret) {
+		dev_err(dev, "Failed to enable IRQ\n");
+		goto clean;
+	}
+
+	ret = devm_add_action_or_reset(dev, if_imx_secvio_sc_disable_irq, dev);
+	if (ret) {
+		dev_err(dev, "Failed to add managed action to disable IRQ\n");
+		goto clean;
+	}
+
+	/* Register the notifier for IRQ from SNVS */
+	data->irq_nb.notifier_call = imx_secvio_sc_notify;
+	ret = imx_scu_irq_register_notifier(&data->irq_nb);
+	if (ret) {
+		dev_err(dev, "Failed to register IRQ notification handler\n");
+		goto clean;
+	}
+
+	ret = devm_add_action_or_reset(dev, if_unregister_imx_secvio_sc_notifier,
+				       &data->irq_nb);
+	if (ret) {
+		dev_err(dev, "Failed to add action to remove irq notify\n");
+		goto clean;
+	}
+
+	/* Register the notification for reporting to user */
+	data->report_nb.notifier_call = report_to_user_notify;
+	ret = register_imx_secvio_sc_notifier(&data->report_nb);
+	if (ret) {
+		dev_err(dev, "Failed to register report notify handler\n");
+		goto clean;
+	}
+
+	ret = devm_add_action_or_reset(dev, if_unregister_imx_secvio_sc_notifier,
+				       &data->report_nb);
+	if (ret) {
+		dev_err(dev, "Failed to add action to remove report notify\n");
+		goto clean;
+	}
+
+	/* Register the notification to report to audit FW */
+	data->audit_nb.notifier_call = report_to_audit_notify;
+	ret = register_imx_secvio_sc_notifier(&data->audit_nb);
+	if (ret) {
+		dev_err(dev, "Failed to register report audit handler\n");
+		goto clean;
+	}
+
+	ret = devm_add_action(dev, if_unregister_imx_secvio_sc_notifier,
+			      &data->audit_nb);
+	if (ret) {
+		dev_err(dev, "Failed to add action to remove audit notif\n");
+		goto clean;
+	}
+
+	/* Register misc device for IOCTL */
+	data->miscdev.name = devm_kstrdup(dev, "secvio-sc", GFP_KERNEL);
+	data->miscdev.minor = MISC_DYNAMIC_MINOR;
+	data->miscdev.fops = &imx_secvio_sc_fops;
+	data->miscdev.parent = dev;
+	ret = misc_register(&data->miscdev);
+	if (ret) {
+		dev_err(dev, "failed to register misc device\n");
+		goto exit;
+	}
+
+	ret = devm_add_action_or_reset(dev, if_misc_deregister, &data->miscdev);
+	if (ret) {
+		dev_err(dev, "Failed to add action to unregister miscdev\n");
+		goto clean;
+	}
+
+	gs_imx_secvio_sc_dev = dev;
+	ret = devm_add_action_or_reset(dev, reset_global_dev, dev);
+	if (ret) {
+		dev_err(dev, "Failed to add action to disable global dev\n");
+		goto clean;
+	}
+
+	/* Process current state of the secvio and tampers */
+	int_imx_secvio_sc_check_state(dev);
+
+	devres_remove_group(dev, NULL);
+
+	goto exit;
+
+clean:
+	devres_release_group(dev, NULL);
+
+exit:
+	return ret;
+}
+
+/**
+ * imx_secvio_sc_probe() - Probe the driver
+ *
+ * @pdev: platform device
+ *
+ * Return:
+ * 0 - OK
+ * < 0 - error.
+ */
+static int imx_secvio_sc_probe(struct platform_device *pdev)
+{
+	int ret;
+	struct device *dev = &pdev->dev;
+
+	ret = imx_secvio_sc_setup(dev);
+	if (ret && ret != -EPROBE_DEFER)
+		dev_err(dev, "Failed to setup\n");
+
+	return ret;
+}
+
+static const struct of_device_id imx_secvio_sc_dt_ids[] = {
+	{ .compatible = "fsl,imx-sc-secvio", },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, imx_secvio_sc_dt_ids);
+
+static struct platform_driver imx_secvio_sc_driver = {
+	.driver = {
+		.owner = THIS_MODULE,
+		.name	= "imx-secvio-sc",
+		.of_match_table = imx_secvio_sc_dt_ids,
+	},
+	.probe		= imx_secvio_sc_probe,
+};
+module_platform_driver(imx_secvio_sc_driver);
+
+MODULE_AUTHOR("Franck LENORMAND <franck.lenormand@nxp.com>");
+MODULE_DESCRIPTION("NXP i.MX driver to handle SNVS secvio irq sent by SCFW");
+MODULE_LICENSE("GPL");
diff --git a/include/soc/imx/imx-secvio-sc.h b/include/soc/imx/imx-secvio-sc.h
new file mode 100644
index 0000000..a26e2ff
--- /dev/null
+++ b/include/soc/imx/imx-secvio-sc.h
@@ -0,0 +1,177 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright 2019-2020 NXP
+ */
+
+#ifndef _MISC_IMX_SECVIO_SC_H_
+#define _MISC_IMX_SECVIO_SC_H_
+
+#include <linux/kernel.h>
+#include <linux/notifier.h>
+
+/* Bitmask of the security violation status bit in the HPSVS register */
+#define HPSVS__LP_SEC_VIO__MASK BIT(31)
+#define HPSVS__SW_LPSV__MASK    BIT(15)
+#define HPSVS__SW_FSV__MASK     BIT(14)
+#define HPSVS__SW_SV__MASK      BIT(13)
+#define HPSVS__SV5__MASK        BIT(5)
+#define HPSVS__SV4__MASK        BIT(4)
+#define HPSVS__SV3__MASK        BIT(3)
+#define HPSVS__SV2__MASK        BIT(2)
+#define HPSVS__SV1__MASK        BIT(1)
+#define HPSVS__SV0__MASK        BIT(0)
+
+/* Bitmask of all security violation status bit in the HPSVS register */
+#define HPSVS__ALL_SV__MASK (HPSVS__LP_SEC_VIO__MASK | \
+			     HPSVS__SW_LPSV__MASK | \
+			     HPSVS__SW_FSV__MASK | \
+			     HPSVS__SW_SV__MASK | \
+			     HPSVS__SV5__MASK | \
+			     HPSVS__SV4__MASK | \
+			     HPSVS__SV3__MASK | \
+			     HPSVS__SV2__MASK | \
+			     HPSVS__SV1__MASK | \
+			     HPSVS__SV0__MASK)
+
+/*
+ * Bitmask of the security violation and tampers status bit in the LPS register
+ */
+#define LPS__ESVD__MASK  BIT(16)
+#define LPS__ET2D__MASK  BIT(10)
+#define LPS__ET1D__MASK  BIT(9)
+#define LPS__WMT2D__MASK BIT(8)
+#define LPS__WMT1D__MASK BIT(7)
+#define LPS__VTD__MASK   BIT(6)
+#define LPS__TTD__MASK   BIT(5)
+#define LPS__CTD__MASK   BIT(4)
+#define LPS__PGD__MASK   BIT(3)
+#define LPS__MCR__MASK   BIT(2)
+#define LPS__SRTCR__MASK BIT(1)
+#define LPS__LPTA__MASK  BIT(0)
+
+/*
+ * Bitmask of all security violation and tampers status bit in the LPS register
+ */
+#define LPS__ALL_TP__MASK (LPS__ESVD__MASK | \
+			   LPS__ET2D__MASK | \
+			   LPS__ET1D__MASK | \
+			   LPS__WMT2D__MASK | \
+			   LPS__WMT1D__MASK | \
+			   LPS__VTD__MASK | \
+			   LPS__TTD__MASK | \
+			   LPS__CTD__MASK | \
+			   LPS__PGD__MASK | \
+			   LPS__MCR__MASK | \
+			   LPS__SRTCR__MASK | \
+			   LPS__LPTA__MASK)
+
+/*
+ * Bitmask of the security violation and tampers status bit in the LPTDS
+ * register
+ */
+#define LPTDS__ET10D__MASK  BIT(7)
+#define LPTDS__ET9D__MASK   BIT(6)
+#define LPTDS__ET8D__MASK   BIT(5)
+#define LPTDS__ET7D__MASK   BIT(4)
+#define LPTDS__ET6D__MASK   BIT(3)
+#define LPTDS__ET5D__MASK   BIT(2)
+#define LPTDS__ET4D__MASK   BIT(1)
+#define LPTDS__ET3D__MASK   BIT(0)
+
+/*
+ * Bitmask of all security violation and tampers status bit in the LPTDS
+ * register
+ */
+#define LPTDS__ALL_TP__MASK (LPTDS__ET10D__MASK | \
+			     LPTDS__ET9D__MASK | \
+			     LPTDS__ET8D__MASK | \
+			     LPTDS__ET7D__MASK | \
+			     LPTDS__ET6D__MASK | \
+			     LPTDS__ET5D__MASK | \
+			     LPTDS__ET4D__MASK | \
+			     LPTDS__ET3D__MASK)
+
+/**
+ * struct secvio_sc_notifier_info - Information about the status of the SNVS
+ * @hpsvs:   status from register HPSVS
+ * @lps: status from register LPS
+ * @lptds: status from register LPTDS
+ */
+struct secvio_sc_notifier_info {
+	u32 hpsvs;
+	u32 lps;
+	u32 lptds;
+};
+
+/**
+ * register_imx_secvio_sc_notifier() - Register a notifier
+ *
+ * @nb: The notifier block structure
+ *
+ * Register a function to notify to the imx-secvio-sc module. The function
+ * will be notified when a check of the state of the SNVS happens: called by
+ * a user or triggered by an interruption form the SNVS.
+ *
+ * The struct secvio_sc_notifier_info is passed as data to the notifier.
+ *
+ * Return: 0 in case of success
+ */
+int register_imx_secvio_sc_notifier(struct notifier_block *nb);
+
+/**
+ * unregister_imx_secvio_sc_notifier() - Unregister a notifier
+ *
+ * @nb: The notifier block structure
+ *
+ * Return: 0 in case of success
+ */
+int unregister_imx_secvio_sc_notifier(struct notifier_block *nb);
+
+/**
+ * imx_secvio_sc_get_state() - Get the state of the SNVS
+ *
+ * @info: The structure containing the state of the SNVS
+ *
+ * Return: 0 in case of success
+ */
+int imx_secvio_sc_get_state(struct secvio_sc_notifier_info *info);
+
+/**
+ * imx_secvio_sc_check_state() - Check the state of the SNVS
+ *
+ * If a security violation or a tamper is detected, the list of notifier
+ * (registered using register_imx_secvio_sc_notifier() ) will be called
+ *
+ * Return: 0 in case of success
+ */
+int imx_secvio_sc_check_state(void);
+
+/**
+ * imx_secvio_sc_clear_state() - Clear the state of the SNVS
+ *
+ * @hpsvs: Value to write to HPSVS register
+ * @lps:   Value to write to LPS register
+ * @lptds: Value to write to LPTDSregister
+ *
+ * The function will write the value provided to the corresponding register
+ * which will clear the status of the bits set.
+ *
+ * Return: 0 in case of success
+ */
+int imx_secvio_sc_clear_state(u32 hpsvs, u32 lps, u32 lptds);
+
+/* Commands of the ioctl interface */
+enum ioctl_cmd_t {
+	GET_STATE,
+	CHECK_STATE,
+	CLEAR_STATE,
+};
+
+/* Definition for the ioctl interface */
+#define IMX_SECVIO_SC_GET_STATE   _IOR('S', GET_STATE, \
+				       struct secvio_sc_notifier_info)
+#define IMX_SECVIO_SC_CHECK_STATE _IO('S', CHECK_STATE)
+#define IMX_SECVIO_SC_CLEAR_STATE _IOW('S', CLEAR_STATE, \
+				       struct secvio_sc_notifier_info)
+
+#endif /* _MISC_IMX_SECVIO_SC_H_ */
-- 
2.7.4