diff options
Diffstat (limited to 'include/soc')
| -rw-r--r-- | include/soc/imx/imx-secvio-sc.h | 178 |
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_ */ |