436 lines
16 KiB
C
436 lines
16 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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#define SPI_FLASH_MMU_PAGE_SIZE 0x10000 /**< Flash cache MMU mapping page 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 For fastest write performance, write a 4 byte aligned size at a
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* 4 byte aligned offset in flash from a source buffer in DRAM. Varying any of
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* these parameters will still work, but will be slower due to buffering.
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*
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* @note Writing more than 8KB at a time will be split into multiple
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* write operations to avoid disrupting other tasks in the system.
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*
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* @param dest_addr Destination address in Flash.
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* @param src Pointer to the source buffer.
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* @param size Length of data, in 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_addr, 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 Flash encryption must be enabled when calling this function.
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* If flash encryption is disabled, the function returns
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* ESP_ERR_INVALID_STATE. Use esp_flash_encryption_enabled()
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* function to determine if flash encryption is enabled.
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*
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* @note Both dest_addr and size must be multiples of 16 bytes. For
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* absolute best performance, both dest_addr and size arguments should
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* be multiples of 32 bytes.
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*
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* @param dest_addr Destination address in Flash. Must be a multiple of 16 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 16 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_addr, 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 For fastest read performance, all parameters should be
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* 4 byte aligned. If source address and read size are not 4 byte
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* aligned, read may be split into multiple flash operations. If
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* destination buffer is not 4 byte aligned, a temporary buffer will
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* be allocated on the stack.
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*
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* @note Reading more than 16KB of data at a time will be split
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* into multiple reads to avoid disruption to other tasks in the
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* system. Consider using spi_flash_mmap() to read large amounts
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* of data.
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*
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* @param src_addr 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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*
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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_addr, void *dest, size_t size);
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/**
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* @brief Read data from Encrypted Flash.
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*
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* If flash encryption is enabled, this function will transparently decrypt data as it is read.
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* If flash encryption is not enabled, this function behaves the same as spi_flash_read().
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*
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* See esp_flash_encryption_enabled() for a function to check if flash encryption is enabled.
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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_encrypted(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 64kB MMU pages and configures
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* them to map the requested region of flash memory into the address space.
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* It may reuse MMU pages which already provide the required mapping.
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*
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* As with any allocator, if mmap/munmap are heavily used then the address space
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* may become fragmented. To troubleshoot issues with page allocation, use
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* 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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* (SPI_FLASH_MMU_PAGE_SIZE)
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* @param size Size of region to be mapped. This size will be rounded
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* up to a 64kB boundary
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* @param memory Address space where the region should be mapped (data or instruction)
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* @param[out] out_ptr Output, pointer to the mapped memory region
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* @param[out] 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(size_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 Map sequences of pages of flash memory into data or instruction address space
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*
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* This function allocates sufficient number of 64kB MMU pages and configures
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* them to map the indicated pages of flash memory contiguously into address space.
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* In this respect, it works in a similar way as spi_flash_mmap() but it allows mapping
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* a (maybe non-contiguous) set of pages into a contiguous region of memory.
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*
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* @param pages An array of numbers indicating the 64kB pages in flash to be mapped
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* contiguously into memory. These indicate the indexes of the 64kB pages,
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* not the byte-size addresses as used in other functions.
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* Array must be located in internal memory.
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* @param page_count Number of entries in the pages array
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* @param memory Address space where the region should be mapped (instruction or data)
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* @param[out] out_ptr Output, pointer to the mapped memory region
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* @param[out] out_handle Output, handle which should be used for spi_flash_munmap call
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*
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* @return
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* - ESP_OK on success
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* - ESP_ERR_NO_MEM if pages can not be allocated
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* - ESP_ERR_INVALID_ARG if pagecount is zero or pages array is not in
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* internal memory
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*/
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esp_err_t spi_flash_mmap_pages(const int *pages, size_t page_count, 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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/**
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* @brief get free pages number which can be mmap
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*
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* This function will return number of free pages available in mmu table. This could be useful
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* before calling actual spi_flash_mmap (maps flash range to DCache or ICache memory) to check
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* if there is sufficient space available for mapping.
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*
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* @param memory memory type of MMU table free page
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*
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* @return number of free pages which can be mmaped
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*/
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uint32_t spi_flash_mmap_get_free_pages(spi_flash_mmap_memory_t memory);
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#define SPI_FLASH_CACHE2PHYS_FAIL UINT32_MAX /*<! Result from spi_flash_cache2phys() if flash cache address is invalid */
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/**
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* @brief Given a memory address where flash is mapped, return the corresponding physical flash offset.
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*
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* Cache address does not have have been assigned via spi_flash_mmap(), any address in memory mapped flash space can be looked up.
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*
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* @param cached Pointer to flashed cached memory.
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*
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* @return
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* - SPI_FLASH_CACHE2PHYS_FAIL If cache address is outside flash cache region, or the address is not mapped.
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* - Otherwise, returns physical offset in flash
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*/
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size_t spi_flash_cache2phys(const void *cached);
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/** @brief Given a physical offset in flash, return the address where it is mapped in the memory space.
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*
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* Physical address does not have to have been assigned via spi_flash_mmap(), any address in flash can be looked up.
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*
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* @note Only the first matching cache address is returned. If MMU flash cache table is configured so multiple entries
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* point to the same physical address, there may be more than one cache address corresponding to that physical
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* address. It is also possible for a single physical address to be mapped to both the IROM and DROM regions.
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*
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* @note This function doesn't impose any alignment constraints, but if memory argument is SPI_FLASH_MMAP_INST and
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* phys_offs is not 4-byte aligned, then reading from the returned pointer will result in a crash.
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*
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* @param phys_offs Physical offset in flash memory to look up.
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* @param memory Address space type to look up a flash cache address mapping for (instruction or data)
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*
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* @return
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* - NULL if the physical address is invalid or not mapped to flash cache of the specified memory type.
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* - Cached memory address (in IROM or DROM space) corresponding to phys_offs.
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*/
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const void *spi_flash_phys2cache(size_t phys_offs, spi_flash_mmap_memory_t memory);
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/** @brief Check at runtime if flash cache is enabled on both CPUs
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*
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* @return true if both CPUs have flash cache enabled, false otherwise.
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*/
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bool spi_flash_cache_enabled();
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/**
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* @brief SPI flash critical section enter function.
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*
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*/
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typedef void (*spi_flash_guard_start_func_t)(void);
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/**
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* @brief SPI flash critical section exit function.
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*/
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typedef void (*spi_flash_guard_end_func_t)(void);
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/**
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* @brief SPI flash operation lock function.
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*/
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typedef void (*spi_flash_op_lock_func_t)(void);
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/**
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* @brief SPI flash operation unlock function.
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*/
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typedef void (*spi_flash_op_unlock_func_t)(void);
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/**
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* @brief Function to protect SPI flash critical regions corruption.
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*/
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typedef bool (*spi_flash_is_safe_write_address_t)(size_t addr, size_t size);
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/**
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* Structure holding SPI flash access critical sections management functions.
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*
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* Flash API uses two types of flash access management functions:
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* 1) Functions which prepare/restore flash cache and interrupts before calling
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* appropriate ROM functions (SPIWrite, SPIRead and SPIEraseBlock):
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* - 'start' function should disables flash cache and non-IRAM interrupts and
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* is invoked before the call to one of ROM function above.
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* - 'end' function should restore state of flash cache and non-IRAM interrupts and
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* is invoked after the call to one of ROM function above.
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* These two functions are not recursive.
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* 2) Functions which synchronizes access to internal data used by flash API.
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* This functions are mostly intended to synchronize access to flash API internal data
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* in multithreaded environment and use OS primitives:
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* - 'op_lock' locks access to flash API internal data.
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* - 'op_unlock' unlocks access to flash API internal data.
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* These two functions are recursive and can be used around the outside of multiple calls to
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* 'start' & 'end', in order to create atomic multi-part flash operations.
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* 3) When CONFIG_SPI_FLASH_WRITING_DANGEROUS_REGIONS_ALLOWED is disabled, flash writing/erasing
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* API checks for addresses provided by user to avoid corruption of critical flash regions
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* (bootloader, partition table, running application etc.).
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*
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* Different versions of the guarding functions should be used depending on the context of
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* execution (with or without functional OS). In normal conditions when flash API is called
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* from task the functions use OS primitives. When there is no OS at all or when
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* it is not guaranteed that OS is functional (accessing flash from exception handler) these
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* functions cannot use OS primitives or even does not need them (multithreaded access is not possible).
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*
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* @note Structure and corresponding guard functions should not reside in flash.
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* For example structure can be placed in DRAM and functions in IRAM sections.
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*/
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typedef struct {
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spi_flash_guard_start_func_t start; /**< critical section start function. */
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spi_flash_guard_end_func_t end; /**< critical section end function. */
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spi_flash_op_lock_func_t op_lock; /**< flash access API lock function.*/
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spi_flash_op_unlock_func_t op_unlock; /**< flash access API unlock function.*/
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#if !CONFIG_SPI_FLASH_WRITING_DANGEROUS_REGIONS_ALLOWED
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spi_flash_is_safe_write_address_t is_safe_write_address; /**< checks flash write addresses.*/
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#endif
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} spi_flash_guard_funcs_t;
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/**
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* @brief Sets guard functions to access flash.
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*
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* @note Pointed structure and corresponding guard functions should not reside in flash.
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* For example structure can be placed in DRAM and functions in IRAM sections.
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*
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* @param funcs pointer to structure holding flash access guard functions.
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*/
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void spi_flash_guard_set(const spi_flash_guard_funcs_t* funcs);
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/**
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* @brief Get the guard functions used for flash access
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*
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* @return The guard functions that were set via spi_flash_guard_set(). These functions
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* can be called if implementing custom low-level SPI flash operations.
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*/
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const spi_flash_guard_funcs_t *spi_flash_guard_get();
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/**
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* @brief Default OS-aware flash access guard functions
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*/
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extern const spi_flash_guard_funcs_t g_flash_guard_default_ops;
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/**
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* @brief Non-OS flash access guard functions
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*
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* @note This version of flash guard functions is to be used when no OS is present or from panic handler.
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* It does not use any OS primitives and IPC and implies that only calling CPU is active.
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*/
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extern const spi_flash_guard_funcs_t g_flash_guard_no_os_ops;
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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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