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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2023, STMicroelectronics - All Rights Reserved
*/
#ifndef _STM32_FIREWALL_H
#define _STM32_FIREWALL_H
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/types.h>
/**
* STM32_PERIPHERAL_FIREWALL: This type of firewall protects peripherals
* STM32_MEMORY_FIREWALL: This type of firewall protects memories/subsets of memory
* zones
* STM32_NOTYPE_FIREWALL: Undefined firewall type
*/
#define STM32_PERIPHERAL_FIREWALL BIT(1)
#define STM32_MEMORY_FIREWALL BIT(2)
#define STM32_NOTYPE_FIREWALL BIT(3)
/**
* struct stm32_firewall_controller - Information on firewall controller supplying services
*
* @name: Name of the firewall controller
* @dev: Device reference of the firewall controller
* @mmio: Base address of the firewall controller
* @entry: List entry of the firewall controller list
* @type: Type of firewall
* @max_entries: Number of entries covered by the firewall
* @grant_access: Callback used to grant access for a device access against a
* firewall controller
* @release_access: Callback used to release resources taken by a device when access was
* granted
* @grant_memory_range_access: Callback used to grant access for a device to a given memory region
*/
struct stm32_firewall_controller {
const char *name;
struct device *dev;
void __iomem *mmio;
struct list_head entry;
unsigned int type;
unsigned int max_entries;
int (*grant_access)(struct stm32_firewall_controller *ctrl, u32 id);
void (*release_access)(struct stm32_firewall_controller *ctrl, u32 id);
int (*grant_memory_range_access)(struct stm32_firewall_controller *ctrl, phys_addr_t paddr,
size_t size);
};
/**
* stm32_firewall_controller_register - Register a firewall controller to the STM32 firewall
* framework
* @firewall_controller: Firewall controller to register
*
* Returns 0 in case of success or -ENODEV if no controller was given.
*/
int stm32_firewall_controller_register(struct stm32_firewall_controller *firewall_controller);
/**
* stm32_firewall_controller_unregister - Unregister a firewall controller from the STM32
* firewall framework
* @firewall_controller: Firewall controller to unregister
*/
void stm32_firewall_controller_unregister(struct stm32_firewall_controller *firewall_controller);
/**
* stm32_firewall_populate_bus - Populate device tree nodes that have a correct firewall
* configuration. This is used at boot-time only, as a sanity check
* between device tree and firewalls hardware configurations to
* prevent a kernel crash when a device driver is not granted access
*
* @firewall_controller: Firewall controller which nodes will be populated or not
*
* Returns 0 in case of success or appropriate errno code if error occurred.
*/
int stm32_firewall_populate_bus(struct stm32_firewall_controller *firewall_controller);
#endif /* _STM32_FIREWALL_H */
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