[PATCH v2 5/5] soc: imx8: Add the SC SECVIO driver

franck.lenormand
2020-07-21T15:21:05Z

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