9eb135fd73
* App access functions are all flash encryption-aware * Documentation for flash encryption * Partition read/write is flash aware * New encrypted write function
224 lines
7 KiB
C
224 lines
7 KiB
C
// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef ESP_SPI_FLASH_H
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#define ESP_SPI_FLASH_H
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#include <stdint.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include "esp_err.h"
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#include "sdkconfig.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define ESP_ERR_FLASH_BASE 0x10010
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#define ESP_ERR_FLASH_OP_FAIL (ESP_ERR_FLASH_BASE + 1)
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#define ESP_ERR_FLASH_OP_TIMEOUT (ESP_ERR_FLASH_BASE + 2)
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#define SPI_FLASH_SEC_SIZE 4096 /**< SPI Flash sector size */
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/**
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* @brief Initialize SPI flash access driver
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*
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* This function must be called exactly once, before any other
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* spi_flash_* functions are called.
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* Currently this function is called from startup code. There is
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* no need to call it from application code.
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*
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*/
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void spi_flash_init();
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/**
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* @brief Get flash chip size, as set in binary image header
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*
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* @note This value does not necessarily match real flash size.
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*
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* @return size of flash chip, in bytes
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*/
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size_t spi_flash_get_chip_size();
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/**
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* @brief Erase the Flash sector.
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*
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* @param sector Sector number, the count starts at sector 0, 4KB per sector.
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*
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* @return esp_err_t
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*/
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esp_err_t spi_flash_erase_sector(size_t sector);
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/**
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* @brief Erase a range of flash sectors
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*
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* @param start_address Address where erase operation has to start.
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* Must be 4kB-aligned
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* @param size Size of erased range, in bytes. Must be divisible by 4kB.
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*
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* @return esp_err_t
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*/
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esp_err_t spi_flash_erase_range(size_t start_address, size_t size);
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/**
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* @brief Write data to Flash.
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*
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* @note Address in flash, dest, has to be 4-byte aligned.
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* This is a temporary limitation which will be removed.
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* @note If source address is in DROM, this function will return
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* ESP_ERR_INVALID_ARG.
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*
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* @param dest destination address in Flash. Must be a multiple of 4 bytes.
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* @param src pointer to the source buffer.
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* @param size length of data, in bytes. Must be a multiple of 4 bytes.
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*
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* @return esp_err_t
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*/
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esp_err_t spi_flash_write(size_t dest, const void *src, size_t size);
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/**
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* @brief Write data encrypted to Flash.
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*
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* @note Flash encryption must be enabled for this function to work.
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*
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* @note Address in flash, dest, has to be 32-byte aligned.
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*
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* @note If source address is in DROM, this function will return
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* ESP_ERR_INVALID_ARG.
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*
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* @param dest destination address in Flash. Must be a multiple of 32 bytes.
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* @param src pointer to the source buffer.
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* @param size length of data, in bytes. Must be a multiple of 32 bytes.
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*
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* @return esp_err_t
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*/
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esp_err_t spi_flash_write_encrypted(size_t dest, const void *src, size_t size);
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/**
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* @brief Read data from Flash.
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*
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* @note Both src and dest have to be 4-byte aligned.
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* This is a temporary limitation which will be removed.
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*
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* @param src source address of the data in Flash.
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* @param dest pointer to the destination buffer
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* @param size length of data
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*
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* @return esp_err_t
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*/
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esp_err_t spi_flash_read(size_t src, void *dest, size_t size);
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/**
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* @brief Enumeration which specifies memory space requested in an mmap call
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*/
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typedef enum {
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SPI_FLASH_MMAP_DATA, /**< map to data memory (Vaddr0), allows byte-aligned access, 4 MB total */
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SPI_FLASH_MMAP_INST, /**< map to instruction memory (Vaddr1-3), allows only 4-byte-aligned access, 11 MB total */
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} spi_flash_mmap_memory_t;
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/**
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* @brief Opaque handle for memory region obtained from spi_flash_mmap.
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*/
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typedef uint32_t spi_flash_mmap_handle_t;
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/**
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* @brief Map region of flash memory into data or instruction address space
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*
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* This function allocates sufficient number of 64k MMU pages and configures
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* them to map request region of flash memory into data address space or into
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* instruction address space. It may reuse MMU pages which already provide
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* required mapping. As with any allocator, there is possibility of fragmentation
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* of address space if mmap/munmap are heavily used. To troubleshoot issues with
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* page allocation, use spi_flash_mmap_dump function.
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*
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* @param src_addr Physical address in flash where requested region starts.
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* This address *must* be aligned to 64kB boundary.
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* @param size Size of region which has to be mapped. This size will be rounded
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* up to a 64k boundary.
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* @param memory Memory space where the region should be mapped
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* @param out_ptr Output, pointer to the mapped memory region
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* @param out_handle Output, handle which should be used for spi_flash_munmap call
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*
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* @return ESP_OK on success, ESP_ERR_NO_MEM if pages can not be allocated
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*/
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esp_err_t spi_flash_mmap(uint32_t src_addr, size_t size, spi_flash_mmap_memory_t memory,
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const void** out_ptr, spi_flash_mmap_handle_t* out_handle);
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/**
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* @brief Release region previously obtained using spi_flash_mmap
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*
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* @note Calling this function will not necessarily unmap memory region.
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* Region will only be unmapped when there are no other handles which
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* reference this region. In case of partially overlapping regions
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* it is possible that memory will be unmapped partially.
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*
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* @param handle Handle obtained from spi_flash_mmap
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*/
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void spi_flash_munmap(spi_flash_mmap_handle_t handle);
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/**
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* @brief Display information about mapped regions
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*
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* This function lists handles obtained using spi_flash_mmap, along with range
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* of pages allocated to each handle. It also lists all non-zero entries of
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* MMU table and corresponding reference counts.
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*/
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void spi_flash_mmap_dump();
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#if CONFIG_SPI_FLASH_ENABLE_COUNTERS
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/**
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* Structure holding statistics for one type of operation
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*/
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typedef struct {
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uint32_t count; // number of times operation was executed
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uint32_t time; // total time taken, in microseconds
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uint32_t bytes; // total number of bytes
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} spi_flash_counter_t;
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typedef struct {
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spi_flash_counter_t read;
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spi_flash_counter_t write;
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spi_flash_counter_t erase;
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} spi_flash_counters_t;
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/**
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* @brief Reset SPI flash operation counters
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*/
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void spi_flash_reset_counters();
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/**
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* @brief Print SPI flash operation counters
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*/
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void spi_flash_dump_counters();
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/**
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* @brief Return current SPI flash operation counters
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*
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* @return pointer to the spi_flash_counters_t structure holding values
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* of the operation counters
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*/
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const spi_flash_counters_t* spi_flash_get_counters();
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#endif //CONFIG_SPI_FLASH_ENABLE_COUNTERS
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#ifdef __cplusplus
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}
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#endif
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#endif /* ESP_SPI_FLASH_H */
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