SSI-87: soc: imx: secvio: Add support for SNVS secvio and tamper via SCFW

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@nxp.com>

1 files changed, 178 insertions, 0 deletions

diff --git a/include/soc/imx/imx-secvio-sc.h b/include/soc/imx/imx-secvio-sc.h
new file mode 100644
index 000000000000..71feca3a0295
--- /dev/null
+++ b/include/soc/imx/imx-secvio-sc.h
@@ -0,0 +1,178 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright 2019 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 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
+ *
+ * @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_ */