flash_manager.h

/* Copyright (c) 2010 - 2018, Nordic Semiconductor ASA
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form, except as embedded into a Nordic
 * Semiconductor ASA integrated circuit in a product or a software update for
 * such product, must reproduce the above copyright notice, this list of
 * conditions and the following disclaimer in the documentation and/or other
 * materials provided with the distribution.
 *
 * 3. Neither the name of Nordic Semiconductor ASA nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * 4. This software, with or without modification, must only be used with a
 * Nordic Semiconductor ASA integrated circuit.
 *
 * 5. Any software provided in binary form under this license must not be reverse
 * engineered, decompiled, modified and/or disassembled.
 *
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 */
#ifndef FLASH_MANAGER_H__
#define FLASH_MANAGER_H__

#include <stdint.h>
#include <stdbool.h>

#include "packet_buffer.h"
#include "nrf_mesh_config_core.h"
#include "queue.h"
#include "bearer_event.h"

#define FLASH_MANAGER_DATA_PER_PAGE (PAGE_SIZE - sizeof(flash_manager_metadata_t))

#define FLASH_MANAGER_PAGE_COUNT_MINIMUM(DATA_SIZE, LARGEST_ENTRY_SIZE) (1 + ((DATA_SIZE) / (FLASH_MANAGER_DATA_PER_PAGE - LARGEST_ENTRY_SIZE)))

#define FLASH_MANAGER_HANDLE_MAX (0x7EFF) 
#define FLASH_MANAGER_HANDLE_INVALID (0x0000) 
#define FLASH_MANAGER_ENTRY_LEN_OVERHEAD (sizeof(fm_header_t) / WORD_SIZE) 
typedef uint16_t fm_handle_t;

typedef struct
{
 uint16_t len_words; 
 fm_handle_t handle; 
} fm_header_t;

typedef struct
{
 fm_handle_t mask; 
 fm_handle_t match; 
} fm_handle_filter_t;

typedef struct
{
 fm_header_t header;
 uint32_t data[];
} fm_entry_t;

typedef enum
{
 FM_STATE_UNINITIALIZED,
 FM_STATE_BUILDING,
 FM_STATE_READY,
 FM_STATE_DEFRAG,
 FM_STATE_REMOVING
} fm_state_t;

typedef struct
{
 uint8_t metadata_len; 
 uint8_t entry_header_length; 
 uint8_t entry_len_length_bits; 
 uint8_t entry_type_length_bits; 
 uint8_t pages_in_area; 
 uint8_t page_index; 
 uint16_t _padding; 
} flash_manager_metadata_t;

typedef union
{
 flash_manager_metadata_t metadata; 
 uint8_t raw[PAGE_SIZE]; 
} flash_manager_page_t;

typedef struct flash_manager flash_manager_t;

typedef enum
{
 FM_RESULT_SUCCESS, 
 FM_RESULT_ERROR_AREA_FULL, 
 FM_RESULT_ERROR_NOT_FOUND, 
 FM_RESULT_ERROR_FLASH_MALFUNCTION 
} fm_result_t;

typedef void (*flash_manager_write_complete_cb_t)(const flash_manager_t * p_manager,
 const fm_entry_t * p_entry,
 fm_result_t result);

typedef void (*flash_manager_invalidate_complete_cb_t)(const flash_manager_t * p_manager,
 fm_handle_t handle,
 fm_result_t result);

typedef void (*flash_manager_remove_complete_cb_t)(const flash_manager_t * p_manager);

typedef void (*flash_manager_queue_empty_cb_t)(void);

typedef struct
{
 const flash_manager_page_t * p_area; 
 uint32_t page_count; 
 uint32_t min_available_space; 
 flash_manager_write_complete_cb_t write_complete_cb; 
 flash_manager_invalidate_complete_cb_t invalidate_complete_cb; 
 flash_manager_remove_complete_cb_t remove_complete_cb; 
} flash_manager_config_t;

typedef struct
{
 fm_state_t state; 
 uint32_t invalid_bytes; 
 const fm_entry_t * p_seal; 
} flash_manager_internal_state_t;

struct flash_manager
{
 flash_manager_internal_state_t internal; 
 flash_manager_config_t config; 
};

typedef void (*flash_manager_mem_listener_cb_t)(void * p_args);

typedef struct
{
 queue_elem_t queue_elem; 
 flash_manager_mem_listener_cb_t callback; 
 void * p_args; 
} fm_mem_listener_t;

void flash_manager_init(void);

uint32_t flash_manager_add(flash_manager_t * p_manager,
 const flash_manager_config_t * p_config);

uint32_t flash_manager_remove(flash_manager_t * p_manager);

const fm_entry_t * flash_manager_entry_get(const flash_manager_t * p_manager, fm_handle_t handle);

const fm_entry_t * flash_manager_entry_next_get(const flash_manager_t * p_manager,
 const fm_handle_filter_t * p_filter,
 const fm_entry_t * p_start);

uint32_t flash_manager_entry_count_get(const flash_manager_t * p_manager, const fm_handle_filter_t * p_filter);

fm_entry_t * flash_manager_entry_alloc(flash_manager_t * p_manager,
 fm_handle_t handle,
 uint32_t data_length);

void flash_manager_entry_commit(const fm_entry_t * p_entry);

uint32_t flash_manager_entry_invalidate(flash_manager_t * p_manager, fm_handle_t handle);

void flash_manager_entry_release(fm_entry_t * p_entry);

void flash_manager_mem_listener_register(fm_mem_listener_t * p_listener);

bool flash_manager_is_stable(void);

void flash_manager_action_queue_empty_cb_set(flash_manager_queue_empty_cb_t queue_empty_cb);

const void * flash_manager_recovery_page_get(void);


static inline void flash_manager_wait(void)
{
#if !defined(HOST)
 while (!flash_manager_is_stable())
 {
 /* Temporary hack to make sure that bearer events are handled while waiting for
 * the flash manager to finish.
 * TODO: Find a solution for this that does not include busy-waiting. */
 if (bearer_event_handler())
 {
 __WFE();
 }
 }
#endif
}


#endif /* FLASH_MANAGER_H__ */