[PATCH 3/4] soc: imx: secvio: Add support for SNVS secvio and tamper via SCFW
From: Vabhav Sharma
Date: Wed May 01 2024 - 01:34:24 EST
The driver register an IRQ handle to SCU for security
violation interrupt.
When an interruption is fired, the driver inform the user.
Signed-off-by: Franck LENORMAND <franck.lenormand@xxxxxxx>
Signed-off-by: Vabhav Sharma <vabhav.sharma@xxxxxxx>
---
drivers/soc/imx/Kconfig | 11 +
drivers/soc/imx/Makefile | 1 +
drivers/soc/imx/secvio/Makefile | 2 +
drivers/soc/imx/secvio/imx-secvio-debugfs.c | 283 ++++++++++
drivers/soc/imx/secvio/imx-secvio-sc.c | 595 ++++++++++++++++++++
include/soc/imx/imx-secvio-sc.h | 216 +++++++
6 files changed, 1108 insertions(+)
create mode 100644 drivers/soc/imx/secvio/Makefile
create mode 100644 drivers/soc/imx/secvio/imx-secvio-debugfs.c
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 2a90ddd20104..3d2715a8b798 100644
--- a/drivers/soc/imx/Kconfig
+++ b/drivers/soc/imx/Kconfig
@@ -20,4 +20,15 @@ config SOC_IMX9
help
If you say yes here, you get support for the NXP i.MX9 family
+config SECVIO_SC
+ tristate "NXP SC secvio support"
+ depends on IMX_SCU
+ default y
+ 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 3ad321ca608a..bda0259077be 100644
--- a/drivers/soc/imx/Makefile
+++ b/drivers/soc/imx/Makefile
@@ -4,3 +4,4 @@ obj-$(CONFIG_ARCH_MXC) += soc-imx.o
endif
obj-$(CONFIG_SOC_IMX8M) += soc-imx8m.o
obj-$(CONFIG_SOC_IMX9) += imx93-src.o
+obj-${CONFIG_SECVIO_SC} += secvio/
diff --git a/drivers/soc/imx/secvio/Makefile b/drivers/soc/imx/secvio/Makefile
new file mode 100644
index 000000000000..55ef1c044009
--- /dev/null
+++ b/drivers/soc/imx/secvio/Makefile
@@ -0,0 +1,2 @@
+obj-y += imx-secvio-sc.o
+obj-$(CONFIG_DEBUG_FS) += imx-secvio-debugfs.o
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 000000000000..6f0af138ee29
--- /dev/null
+++ b/drivers/soc/imx/secvio/imx-secvio-debugfs.c
@@ -0,0 +1,283 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2019, 2024 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 ducumentation)
+ * - 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
+ */
+
+/* Includes */
+#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>
+
+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;
+}
+
+static int snvs_reader(struct device *dev, u32 id, u32 *value, u8 mul)
+{
+ int ret;
+ u32 *v1, *v2, *v3, *v4, *v5;
+ struct imx_secvio_sc_data *data;
+
+ data = dev_get_drvdata(dev);
+ 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 = imx_sc_seco_secvio_config(data->ipc_handle, 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;
+}
+
+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;
+
+ 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;
+};
+
+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;
+}
+
+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);
+}
+
+static void imx_secvio_sc_info_seq_stop(struct seq_file *m, void *v)
+{
+}
+
+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,
+};
+
+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,
+};
+
+static void if_debugfs_remove_recursive(void *dentry)
+{
+ debugfs_remove_recursive(dentry);
+}
+
+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;
+ }
+
+exit:
+ return ret;
+
+remove_fs:
+ debugfs_remove_recursive(data->dfs);
+ goto exit;
+}
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 000000000000..a4e96c730a23
--- /dev/null
+++ b/drivers/soc/imx/secvio/imx-secvio-sc.c
@@ -0,0 +1,595 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2019, 2024 NXP
+ *
+ */
+
+/*
+ * The i.MX8QXP SoC contains the Secure Non-Volatile Storage (SNVS) block. This
+ * block can detect specific hardware attacks.This block can only be accessible
+ * using the SCFW API.
+ *
+ * This module interact with the SCU which relay 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
+ * - imx_secvio_sc_clear_state
+ * - imx_secvio_sc_enable_irq
+ * - imx_secvio_sc_disable_irq
+ */
+
+#include <dt-bindings/firmware/imx/rsrc.h>
+#include <linux/device.h>
+#include <linux/fs.h>
+#include <linux/kernel.h>
+#include <linux/miscdevice.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/notifier.h>
+#include <linux/nvmem-consumer.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/uaccess.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 <soc/imx/imx-secvio-sc.h>
+
+/* Reference on the driver_device */
+static struct device *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);
+
+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);
+
+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);
+
+static void if_imx_scu_irq_register_notifier(void *nb)
+{
+ imx_scu_irq_register_notifier(nb);
+}
+
+static void if_unregister_imx_secvio_sc_notifier(void *nb)
+{
+ unregister_imx_secvio_sc_notifier(nb);
+}
+
+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 imx_secvio_sc_get_state(struct device *dev,
+ struct secvio_sc_notifier_info *info)
+{
+ int ret, err = 0;
+ struct imx_secvio_sc_data *data;
+
+ dev = imx_secvio_sc_dev;
+ if (!dev)
+ return -EINVAL;
+
+ data = dev_get_drvdata(dev);
+
+ /* Read secvio status */
+ ret = imx_sc_seco_secvio_config(data->ipc_handle, HPSVS_ID, SECVIO_CONFIG_READ,
+ &info->hpsvs, NULL, NULL, NULL, NULL, 1);
+ if (ret) {
+ err = ret;
+ dev_err(dev, "Fail read secvio config status %d\n", ret);
+ }
+ info->hpsvs &= HPSVS_ALL_SV_MASK;
+
+ /* Read tampers status */
+ ret = imx_sc_seco_secvio_config(data->ipc_handle, LPS_ID, SECVIO_CONFIG_READ,
+ &info->lps, NULL, NULL, NULL, NULL, 1);
+ if (ret) {
+ err = ret;
+ dev_err(dev, "Fail read tamper 1 status: %d\n", ret);
+ }
+ info->lps &= LPS_ALL_TP_MASK;
+
+ ret = imx_sc_seco_secvio_config(data->ipc_handle, LPTDS_ID, SECVIO_CONFIG_READ,
+ &info->lptds, NULL, NULL, NULL, NULL, 1);
+ if (ret) {
+ err = ret;
+ dev_err(dev, "Fail read tamper 2 status: %d\n", ret);
+ }
+ info->lptds &= LPTDS_ALL_TP_MASK;
+
+ dev_dbg(dev, "Status: %.8x, %.8x, %.8x\n", info->hpsvs,
+ info->lps, info->lptds);
+
+ return err;
+}
+EXPORT_SYMBOL(imx_secvio_sc_get_state);
+
+int imx_secvio_sc_check_state(struct device *dev)
+{
+ struct secvio_sc_notifier_info info;
+ int ret;
+
+ dev = imx_secvio_sc_dev;
+
+ ret = imx_secvio_sc_get_state(dev, &info);
+ if (ret) {
+ dev_err(dev, "Failed to get secvio state\n");
+ return ret;
+ }
+
+ /* 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");
+
+ return ret;
+}
+EXPORT_SYMBOL(imx_secvio_sc_check_state);
+
+static int imx_secvio_sc_disable_irq(struct device *dev)
+{
+ int ret;
+
+ if (!dev)
+ return -EINVAL;
+
+ /* 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 ret;
+}
+
+static int imx_secvio_sc_enable_irq(struct device *dev)
+{
+ int ret = 0, err;
+ u32 irq_status;
+ struct imx_secvio_sc_data *data;
+
+ if (!dev)
+ return -EINVAL;
+
+ 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) {
+ err = imx_secvio_sc_disable_irq(dev);
+ if (err)
+ dev_warn(dev, "Failed to disable the IRQ\n");
+ }
+
+ return ret;
+}
+
+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;
+
+ /* Filter event for us */
+ if (!((event & IMX_SC_IRQ_SECVIO) &&
+ (*(u8 *)group == IMX_SC_IRQ_GROUP_WAKE)))
+ return 0;
+
+ dev_warn(dev, "secvio security violation detected\n");
+
+ ret = imx_secvio_sc_check_state(dev);
+
+ /* Re-enable interrupt */
+ ret = imx_secvio_sc_enable_irq(dev);
+ if (ret)
+ dev_err(dev, "Failed to enable IRQ\n");
+
+ return ret;
+}
+
+int imx_secvio_sc_clear_state(struct device *dev, u32 hpsvs, u32 lps, u32 lptds)
+{
+ int ret;
+ struct imx_secvio_sc_data *data;
+
+ dev = imx_secvio_sc_dev;
+ if (!dev)
+ return -EINVAL;
+
+ data = dev_get_drvdata(dev);
+
+ ret = imx_sc_seco_secvio_config(data->ipc_handle, HPSVS_ID, SECVIO_CONFIG_WRITE,
+ &hpsvs, NULL, NULL, NULL, NULL, 1);
+ if (ret) {
+ dev_err(dev, "Fail to clear secvio status: %d\n", ret);
+ return ret;
+ }
+
+ ret = imx_sc_seco_secvio_config(data->ipc_handle, LPS_ID, SECVIO_CONFIG_WRITE,
+ &lps, NULL, NULL, NULL, NULL, 1);
+ if (ret) {
+ dev_err(dev, "Fail to clear tamper 1 status: %d\n", ret);
+ return ret;
+ }
+
+ ret = imx_sc_seco_secvio_config(data->ipc_handle, LPTDS_ID, SECVIO_CONFIG_WRITE,
+ &lptds, NULL, NULL, NULL, NULL, 1);
+ if (ret) {
+ dev_err(dev, "Fail to clear tamper 2 status: %d\n", ret);
+ return ret;
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL(imx_secvio_sc_clear_state);
+
+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;
+}
+
+static void if_imx_secvio_sc_disable_irq(void *dev)
+{
+ imx_secvio_sc_disable_irq(dev);
+}
+
+static int imx_secvio_sc_open(struct inode *node, struct file *filp)
+{
+ filp->private_data = node->i_private;
+
+ return 0;
+}
+
+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 = imx_secvio_sc_get_state(dev, &info);
+ if (ret)
+ return ret;
+
+ ret = copy_to_user((void *)arg, &info, sizeof(info));
+ if (ret) {
+ dev_err(dev, "Fail to copy info to user\n");
+ return -EFAULT;
+ }
+ break;
+ case IMX_SECVIO_SC_CHECK_STATE:
+ ret = imx_secvio_sc_check_state(dev);
+ if (ret)
+ return ret;
+ 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");
+ return -EFAULT;
+ }
+
+ ret = imx_secvio_sc_clear_state(dev, info.hpsvs, info.lps,
+ info.lptds);
+ if (ret)
+ return ret;
+ break;
+ default:
+ ret = -ENOIOCTLCMD;
+ }
+
+ return ret;
+}
+
+static const 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 int imx_secvio_sc_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct imx_secvio_sc_data *data;
+ u32 seco_version = 0;
+ bool own_secvio;
+ u32 irq_status;
+ int ret;
+
+ /* Allocate private data */
+ data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ if (!devres_open_group(dev, NULL, GFP_KERNEL))
+ return -ENOMEM;
+
+ 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_probe(dev, ret, "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 = 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_imx_scu_irq_register_notifier,
+ &data->irq_nb);
+ if (ret) {
+ dev_err(dev, "Failed to add action to remove irq notif\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 notif 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 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");
+ return ret;
+ }
+
+ 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;
+ }
+
+ imx_secvio_sc_dev = dev;
+
+ /* Process current state of the secvio and tampers */
+ imx_secvio_sc_check_state(dev);
+
+ devres_remove_group(dev, NULL);
+
+ return ret;
+
+clean:
+ devres_release_group(dev, NULL);
+
+ 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@xxxxxxx>");
+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 000000000000..d8c9208217fe
--- /dev/null
+++ b/include/soc/imx/imx-secvio-sc.h
@@ -0,0 +1,216 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright 2019, 2024 NXP
+ */
+
+#ifndef _MISC_IMX_SECVIO_SC_H_
+#define _MISC_IMX_SECVIO_SC_H_
+
+#include <linux/kernel.h>
+#include <linux/miscdevice.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)
+
+/* 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 nvmem_device *nvmem;
+
+ struct miscdevice miscdev;
+
+#ifdef CONFIG_DEBUG_FS
+ struct dentry *dfs;
+#endif
+
+ u32 version;
+};
+
+/* Struct for notification */
+/**
+ * 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
+ *
+ * @dev: Pointer to the struct device of secvio
+ * @info: The structure containing the state of the SNVS
+ *
+ * Return: 0 in case of success
+ */
+int imx_secvio_sc_get_state(struct device *dev, 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
+ *
+ * @dev: Pointer to the struct device of secvio
+ *
+ * Return: 0 in case of success
+ */
+int imx_secvio_sc_check_state(struct device *dev);
+
+/**
+ * imx_secvio_sc_clear_state() - Clear the state of the SNVS
+ *
+ * @dev: Pointer to the struct device of secvio
+ * @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(struct device *dev, 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)
+
+#ifdef CONFIG_DEBUG_FS
+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 */
+#endif /* _MISC_IMX_SECVIO_SC_H_ */
--
2.25.1