219 lines
6.3 KiB
C
219 lines
6.3 KiB
C
/*
|
|
* Copyright (c) 2017 Nordic Semiconductor ASA
|
|
* Copyright (c) 2016 Intel Corporation
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* @brief Public API for FLASH drivers
|
|
*/
|
|
|
|
#ifndef __FLASH_H__
|
|
#define __FLASH_H__
|
|
|
|
/**
|
|
* @brief FLASH Interface
|
|
* @defgroup flash_interface FLASH Interface
|
|
* @ingroup io_interfaces
|
|
* @{
|
|
*/
|
|
|
|
#include <zephyr/types.h>
|
|
#include <stddef.h>
|
|
#include <sys/types.h>
|
|
#include <device.h>
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
#if defined(CONFIG_FLASH_PAGE_LAYOUT)
|
|
struct flash_pages_layout {
|
|
size_t pages_count; /* count of pages sequence of the same size */
|
|
size_t pages_size;
|
|
};
|
|
#endif /* CONFIG_FLASH_PAGE_LAYOUT */
|
|
|
|
typedef int (*flash_api_read)(struct device *dev, off_t offset, void *data,
|
|
size_t len);
|
|
typedef int (*flash_api_write)(struct device *dev, off_t offset,
|
|
const void *data, size_t len);
|
|
typedef int (*flash_api_erase)(struct device *dev, off_t offset, size_t size);
|
|
typedef int (*flash_api_write_protection)(struct device *dev, bool enable);
|
|
|
|
#if defined(CONFIG_FLASH_PAGE_LAYOUT)
|
|
/**
|
|
* @brief Retrieve a flash device's layout.
|
|
*
|
|
* A flash device layout is a run-length encoded description of the
|
|
* pages on the device.
|
|
*
|
|
* For flash memories which have uniform sector layout, this routine
|
|
* returns an array of length 1, which specifies the page size and
|
|
* number of pages in the memory.
|
|
*
|
|
* Layouts for flash memories with nonuniform sector sizes will be
|
|
* returned as an array with multiple elements, each of which
|
|
* describes a group of sectors that all have the same size. In this
|
|
* case, the sequence of array elements specifies the order in which
|
|
* these groups occur on the device.
|
|
*
|
|
* @param dev Flash device whose layout to retrieve.
|
|
* @param layout The flash layout will be returned in this argument.
|
|
* @param layout_size The number of elements in the returned layout.
|
|
*/
|
|
|
|
typedef void (*flash_api_pages_layout)(struct device *dev,
|
|
const struct flash_pages_layout **layout,
|
|
size_t *layout_size);
|
|
#endif /* CONFIG_FLASH_PAGE_LAYOUT */
|
|
|
|
struct flash_driver_api {
|
|
flash_api_read read;
|
|
flash_api_write write;
|
|
flash_api_erase erase;
|
|
flash_api_write_protection write_protection;
|
|
#if defined(CONFIG_FLASH_PAGE_LAYOUT)
|
|
flash_api_pages_layout page_layout;
|
|
#endif /* CONFIG_FLASH_PAGE_LAYOUT */
|
|
};
|
|
|
|
/**
|
|
* @brief Read data from flash
|
|
*
|
|
* @param dev : flash dev
|
|
* @param offset : Offset (byte aligned) to read
|
|
* @param data : Buffer to store read data
|
|
* @param len : Number of bytes to read.
|
|
*
|
|
* @return 0 on success, negative errno code on fail.
|
|
*/
|
|
static inline int flash_read(struct device *dev, off_t offset, void *data,
|
|
size_t len)
|
|
{
|
|
const struct flash_driver_api *api = dev->driver_api;
|
|
|
|
return api->read(dev, offset, data, len);
|
|
}
|
|
|
|
/**
|
|
* @brief Write buffer into flash memory.
|
|
*
|
|
* Prior to the invocation of this API, the flash_write_protection_set needs
|
|
* to be called first to disable the write protection.
|
|
*
|
|
* @param dev : flash device
|
|
* @param offset : starting offset for the write
|
|
* @param data : data to write
|
|
* @param len : Number of bytes to write
|
|
*
|
|
* @return 0 on success, negative errno code on fail.
|
|
*/
|
|
static inline int flash_write(struct device *dev, off_t offset,
|
|
const void *data, size_t len)
|
|
{
|
|
const struct flash_driver_api *api = dev->driver_api;
|
|
|
|
return api->write(dev, offset, data, len);
|
|
}
|
|
|
|
/**
|
|
* @brief Erase part or all of a flash memory
|
|
*
|
|
* Acceptable values of erase size and offset are subject to
|
|
* hardware-specific multiples of sector size and offset. Please check the
|
|
* API implemented by the underlying sub driver.
|
|
*
|
|
* Prior to the invocation of this API, the flash_write_protection_set needs
|
|
* to be called first to disable the write protection.
|
|
*
|
|
* @param dev : flash device
|
|
* @param offset : erase area starting offset
|
|
* @param size : size of area to be erased
|
|
*
|
|
* @return 0 on success, negative errno code on fail.
|
|
*/
|
|
static inline int flash_erase(struct device *dev, off_t offset, size_t size)
|
|
{
|
|
const struct flash_driver_api *api = dev->driver_api;
|
|
|
|
return api->erase(dev, offset, size);
|
|
}
|
|
|
|
/**
|
|
* @brief Enable or disable write protection for a flash memory
|
|
*
|
|
* This API is required to be called before the invocation of write or erase
|
|
* API. Please note that on some flash components, the write protection is
|
|
* automatically turned on again by the device after the completion of each
|
|
* write or erase calls. Therefore, on those flash parts, write protection needs
|
|
* to be disabled before each invocation of the write or erase API. Please refer
|
|
* to the sub-driver API or the data sheet of the flash component to get details
|
|
* on the write protection behavior.
|
|
*
|
|
* @param dev : flash device
|
|
* @param enable : enable or disable flash write protection
|
|
*
|
|
* @return 0 on success, negative errno code on fail.
|
|
*/
|
|
static inline int flash_write_protection_set(struct device *dev, bool enable)
|
|
{
|
|
const struct flash_driver_api *api = dev->driver_api;
|
|
|
|
return api->write_protection(dev, enable);
|
|
}
|
|
|
|
#if defined(CONFIG_FLASH_PAGE_LAYOUT)
|
|
|
|
struct flash_pages_info {
|
|
off_t start_offset; /* offset from the base of flash address */
|
|
size_t size;
|
|
u32_t index;
|
|
};
|
|
|
|
/**
|
|
* @brief Get size and start offset of flash page at certain flash offset.
|
|
*
|
|
* @param dev flash device
|
|
* @param offset Offset within the page
|
|
* @param info Page Info structure to be filled
|
|
*
|
|
* @return 0 on success, -EINVAL if page of the offset doesn't exist.
|
|
*/
|
|
int flash_get_page_info_by_offs(struct device *dev, off_t offset,
|
|
struct flash_pages_info *info);
|
|
|
|
/**
|
|
* @brief Get size and start offset of flash page of certain index.
|
|
*
|
|
* @param dev flash device
|
|
* @param page_index Index of the page. Index are counted from 0.
|
|
* @param info Page Info structure to be filled
|
|
*
|
|
* @return 0 on success, -EINVAL if page of the index doesn't exist.
|
|
*/
|
|
int flash_get_page_info_by_idx(struct device *dev, u32_t page_index,
|
|
struct flash_pages_info *info);
|
|
|
|
/**
|
|
* @brief Get number of flash pages.
|
|
*
|
|
* @param dev flash device
|
|
*
|
|
* @return Number of flash pages.
|
|
*/
|
|
size_t flash_get_page_count(struct device *dev);
|
|
#endif /* CONFIG_FLASH_PAGE_LAYOUT */
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
#endif /* _FLASH_H_ */
|