OVMS3-idf/components/spi_flash/include/esp_spi_flash.h

436 lines
16 KiB
C

// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef ESP_SPI_FLASH_H
#define ESP_SPI_FLASH_H
#include <stdint.h>
#include <stdbool.h>
#include <stddef.h>
#include "esp_err.h"
#include "sdkconfig.h"
#ifdef __cplusplus
extern "C" {
#endif
#define ESP_ERR_FLASH_BASE 0x10010
#define ESP_ERR_FLASH_OP_FAIL (ESP_ERR_FLASH_BASE + 1)
#define ESP_ERR_FLASH_OP_TIMEOUT (ESP_ERR_FLASH_BASE + 2)
#define SPI_FLASH_SEC_SIZE 4096 /**< SPI Flash sector size */
#define SPI_FLASH_MMU_PAGE_SIZE 0x10000 /**< Flash cache MMU mapping page size */
/**
* @brief Initialize SPI flash access driver
*
* This function must be called exactly once, before any other
* spi_flash_* functions are called.
* Currently this function is called from startup code. There is
* no need to call it from application code.
*
*/
void spi_flash_init();
/**
* @brief Get flash chip size, as set in binary image header
*
* @note This value does not necessarily match real flash size.
*
* @return size of flash chip, in bytes
*/
size_t spi_flash_get_chip_size();
/**
* @brief Erase the Flash sector.
*
* @param sector Sector number, the count starts at sector 0, 4KB per sector.
*
* @return esp_err_t
*/
esp_err_t spi_flash_erase_sector(size_t sector);
/**
* @brief Erase a range of flash sectors
*
* @param start_address Address where erase operation has to start.
* Must be 4kB-aligned
* @param size Size of erased range, in bytes. Must be divisible by 4kB.
*
* @return esp_err_t
*/
esp_err_t spi_flash_erase_range(size_t start_address, size_t size);
/**
* @brief Write data to Flash.
*
* @note For fastest write performance, write a 4 byte aligned size at a
* 4 byte aligned offset in flash from a source buffer in DRAM. Varying any of
* these parameters will still work, but will be slower due to buffering.
*
* @note Writing more than 8KB at a time will be split into multiple
* write operations to avoid disrupting other tasks in the system.
*
* @param dest_addr Destination address in Flash.
* @param src Pointer to the source buffer.
* @param size Length of data, in bytes.
*
* @return esp_err_t
*/
esp_err_t spi_flash_write(size_t dest_addr, const void *src, size_t size);
/**
* @brief Write data encrypted to Flash.
*
* @note Flash encryption must be enabled for this function to work.
*
* @note Flash encryption must be enabled when calling this function.
* If flash encryption is disabled, the function returns
* ESP_ERR_INVALID_STATE. Use esp_flash_encryption_enabled()
* function to determine if flash encryption is enabled.
*
* @note Both dest_addr and size must be multiples of 16 bytes. For
* absolute best performance, both dest_addr and size arguments should
* be multiples of 32 bytes.
*
* @param dest_addr Destination address in Flash. Must be a multiple of 16 bytes.
* @param src Pointer to the source buffer.
* @param size Length of data, in bytes. Must be a multiple of 16 bytes.
*
* @return esp_err_t
*/
esp_err_t spi_flash_write_encrypted(size_t dest_addr, const void *src, size_t size);
/**
* @brief Read data from Flash.
*
* @note For fastest read performance, all parameters should be
* 4 byte aligned. If source address and read size are not 4 byte
* aligned, read may be split into multiple flash operations. If
* destination buffer is not 4 byte aligned, a temporary buffer will
* be allocated on the stack.
*
* @note Reading more than 16KB of data at a time will be split
* into multiple reads to avoid disruption to other tasks in the
* system. Consider using spi_flash_mmap() to read large amounts
* of data.
*
* @param src_addr source address of the data in Flash.
* @param dest pointer to the destination buffer
* @param size length of data
*
*
* @return esp_err_t
*/
esp_err_t spi_flash_read(size_t src_addr, void *dest, size_t size);
/**
* @brief Read data from Encrypted Flash.
*
* If flash encryption is enabled, this function will transparently decrypt data as it is read.
* If flash encryption is not enabled, this function behaves the same as spi_flash_read().
*
* See esp_flash_encryption_enabled() for a function to check if flash encryption is enabled.
*
* @param src source address of the data in Flash.
* @param dest pointer to the destination buffer
* @param size length of data
*
* @return esp_err_t
*/
esp_err_t spi_flash_read_encrypted(size_t src, void *dest, size_t size);
/**
* @brief Enumeration which specifies memory space requested in an mmap call
*/
typedef enum {
SPI_FLASH_MMAP_DATA, /**< map to data memory (Vaddr0), allows byte-aligned access, 4 MB total */
SPI_FLASH_MMAP_INST, /**< map to instruction memory (Vaddr1-3), allows only 4-byte-aligned access, 11 MB total */
} spi_flash_mmap_memory_t;
/**
* @brief Opaque handle for memory region obtained from spi_flash_mmap.
*/
typedef uint32_t spi_flash_mmap_handle_t;
/**
* @brief Map region of flash memory into data or instruction address space
*
* This function allocates sufficient number of 64kB MMU pages and configures
* them to map the requested region of flash memory into the address space.
* It may reuse MMU pages which already provide the required mapping.
*
* As with any allocator, if mmap/munmap are heavily used then the address space
* may become fragmented. To troubleshoot issues with page allocation, use
* spi_flash_mmap_dump() function.
*
* @param src_addr Physical address in flash where requested region starts.
* This address *must* be aligned to 64kB boundary
* (SPI_FLASH_MMU_PAGE_SIZE)
* @param size Size of region to be mapped. This size will be rounded
* up to a 64kB boundary
* @param memory Address space where the region should be mapped (data or instruction)
* @param[out] out_ptr Output, pointer to the mapped memory region
* @param[out] out_handle Output, handle which should be used for spi_flash_munmap call
*
* @return ESP_OK on success, ESP_ERR_NO_MEM if pages can not be allocated
*/
esp_err_t spi_flash_mmap(size_t src_addr, size_t size, spi_flash_mmap_memory_t memory,
const void** out_ptr, spi_flash_mmap_handle_t* out_handle);
/**
* @brief Map sequences of pages of flash memory into data or instruction address space
*
* This function allocates sufficient number of 64kB MMU pages and configures
* them to map the indicated pages of flash memory contiguously into address space.
* In this respect, it works in a similar way as spi_flash_mmap() but it allows mapping
* a (maybe non-contiguous) set of pages into a contiguous region of memory.
*
* @param pages An array of numbers indicating the 64kB pages in flash to be mapped
* contiguously into memory. These indicate the indexes of the 64kB pages,
* not the byte-size addresses as used in other functions.
* Array must be located in internal memory.
* @param page_count Number of entries in the pages array
* @param memory Address space where the region should be mapped (instruction or data)
* @param[out] out_ptr Output, pointer to the mapped memory region
* @param[out] out_handle Output, handle which should be used for spi_flash_munmap call
*
* @return
* - ESP_OK on success
* - ESP_ERR_NO_MEM if pages can not be allocated
* - ESP_ERR_INVALID_ARG if pagecount is zero or pages array is not in
* internal memory
*/
esp_err_t spi_flash_mmap_pages(const int *pages, size_t page_count, spi_flash_mmap_memory_t memory,
const void** out_ptr, spi_flash_mmap_handle_t* out_handle);
/**
* @brief Release region previously obtained using spi_flash_mmap
*
* @note Calling this function will not necessarily unmap memory region.
* Region will only be unmapped when there are no other handles which
* reference this region. In case of partially overlapping regions
* it is possible that memory will be unmapped partially.
*
* @param handle Handle obtained from spi_flash_mmap
*/
void spi_flash_munmap(spi_flash_mmap_handle_t handle);
/**
* @brief Display information about mapped regions
*
* This function lists handles obtained using spi_flash_mmap, along with range
* of pages allocated to each handle. It also lists all non-zero entries of
* MMU table and corresponding reference counts.
*/
void spi_flash_mmap_dump();
/**
* @brief get free pages number which can be mmap
*
* This function will return number of free pages available in mmu table. This could be useful
* before calling actual spi_flash_mmap (maps flash range to DCache or ICache memory) to check
* if there is sufficient space available for mapping.
*
* @param memory memory type of MMU table free page
*
* @return number of free pages which can be mmaped
*/
uint32_t spi_flash_mmap_get_free_pages(spi_flash_mmap_memory_t memory);
#define SPI_FLASH_CACHE2PHYS_FAIL UINT32_MAX /*<! Result from spi_flash_cache2phys() if flash cache address is invalid */
/**
* @brief Given a memory address where flash is mapped, return the corresponding physical flash offset.
*
* Cache address does not have have been assigned via spi_flash_mmap(), any address in memory mapped flash space can be looked up.
*
* @param cached Pointer to flashed cached memory.
*
* @return
* - SPI_FLASH_CACHE2PHYS_FAIL If cache address is outside flash cache region, or the address is not mapped.
* - Otherwise, returns physical offset in flash
*/
size_t spi_flash_cache2phys(const void *cached);
/** @brief Given a physical offset in flash, return the address where it is mapped in the memory space.
*
* Physical address does not have to have been assigned via spi_flash_mmap(), any address in flash can be looked up.
*
* @note Only the first matching cache address is returned. If MMU flash cache table is configured so multiple entries
* point to the same physical address, there may be more than one cache address corresponding to that physical
* address. It is also possible for a single physical address to be mapped to both the IROM and DROM regions.
*
* @note This function doesn't impose any alignment constraints, but if memory argument is SPI_FLASH_MMAP_INST and
* phys_offs is not 4-byte aligned, then reading from the returned pointer will result in a crash.
*
* @param phys_offs Physical offset in flash memory to look up.
* @param memory Address space type to look up a flash cache address mapping for (instruction or data)
*
* @return
* - NULL if the physical address is invalid or not mapped to flash cache of the specified memory type.
* - Cached memory address (in IROM or DROM space) corresponding to phys_offs.
*/
const void *spi_flash_phys2cache(size_t phys_offs, spi_flash_mmap_memory_t memory);
/** @brief Check at runtime if flash cache is enabled on both CPUs
*
* @return true if both CPUs have flash cache enabled, false otherwise.
*/
bool spi_flash_cache_enabled();
/**
* @brief SPI flash critical section enter function.
*
*/
typedef void (*spi_flash_guard_start_func_t)(void);
/**
* @brief SPI flash critical section exit function.
*/
typedef void (*spi_flash_guard_end_func_t)(void);
/**
* @brief SPI flash operation lock function.
*/
typedef void (*spi_flash_op_lock_func_t)(void);
/**
* @brief SPI flash operation unlock function.
*/
typedef void (*spi_flash_op_unlock_func_t)(void);
/**
* @brief Function to protect SPI flash critical regions corruption.
*/
typedef bool (*spi_flash_is_safe_write_address_t)(size_t addr, size_t size);
/**
* Structure holding SPI flash access critical sections management functions.
*
* Flash API uses two types of flash access management functions:
* 1) Functions which prepare/restore flash cache and interrupts before calling
* appropriate ROM functions (SPIWrite, SPIRead and SPIEraseBlock):
* - 'start' function should disables flash cache and non-IRAM interrupts and
* is invoked before the call to one of ROM function above.
* - 'end' function should restore state of flash cache and non-IRAM interrupts and
* is invoked after the call to one of ROM function above.
* These two functions are not recursive.
* 2) Functions which synchronizes access to internal data used by flash API.
* This functions are mostly intended to synchronize access to flash API internal data
* in multithreaded environment and use OS primitives:
* - 'op_lock' locks access to flash API internal data.
* - 'op_unlock' unlocks access to flash API internal data.
* These two functions are recursive and can be used around the outside of multiple calls to
* 'start' & 'end', in order to create atomic multi-part flash operations.
* 3) When CONFIG_SPI_FLASH_WRITING_DANGEROUS_REGIONS_ALLOWED is disabled, flash writing/erasing
* API checks for addresses provided by user to avoid corruption of critical flash regions
* (bootloader, partition table, running application etc.).
*
* Different versions of the guarding functions should be used depending on the context of
* execution (with or without functional OS). In normal conditions when flash API is called
* from task the functions use OS primitives. When there is no OS at all or when
* it is not guaranteed that OS is functional (accessing flash from exception handler) these
* functions cannot use OS primitives or even does not need them (multithreaded access is not possible).
*
* @note Structure and corresponding guard functions should not reside in flash.
* For example structure can be placed in DRAM and functions in IRAM sections.
*/
typedef struct {
spi_flash_guard_start_func_t start; /**< critical section start function. */
spi_flash_guard_end_func_t end; /**< critical section end function. */
spi_flash_op_lock_func_t op_lock; /**< flash access API lock function.*/
spi_flash_op_unlock_func_t op_unlock; /**< flash access API unlock function.*/
#if !CONFIG_SPI_FLASH_WRITING_DANGEROUS_REGIONS_ALLOWED
spi_flash_is_safe_write_address_t is_safe_write_address; /**< checks flash write addresses.*/
#endif
} spi_flash_guard_funcs_t;
/**
* @brief Sets guard functions to access flash.
*
* @note Pointed structure and corresponding guard functions should not reside in flash.
* For example structure can be placed in DRAM and functions in IRAM sections.
*
* @param funcs pointer to structure holding flash access guard functions.
*/
void spi_flash_guard_set(const spi_flash_guard_funcs_t* funcs);
/**
* @brief Get the guard functions used for flash access
*
* @return The guard functions that were set via spi_flash_guard_set(). These functions
* can be called if implementing custom low-level SPI flash operations.
*/
const spi_flash_guard_funcs_t *spi_flash_guard_get();
/**
* @brief Default OS-aware flash access guard functions
*/
extern const spi_flash_guard_funcs_t g_flash_guard_default_ops;
/**
* @brief Non-OS flash access guard functions
*
* @note This version of flash guard functions is to be used when no OS is present or from panic handler.
* It does not use any OS primitives and IPC and implies that only calling CPU is active.
*/
extern const spi_flash_guard_funcs_t g_flash_guard_no_os_ops;
#if CONFIG_SPI_FLASH_ENABLE_COUNTERS
/**
* Structure holding statistics for one type of operation
*/
typedef struct {
uint32_t count; // number of times operation was executed
uint32_t time; // total time taken, in microseconds
uint32_t bytes; // total number of bytes
} spi_flash_counter_t;
typedef struct {
spi_flash_counter_t read;
spi_flash_counter_t write;
spi_flash_counter_t erase;
} spi_flash_counters_t;
/**
* @brief Reset SPI flash operation counters
*/
void spi_flash_reset_counters();
/**
* @brief Print SPI flash operation counters
*/
void spi_flash_dump_counters();
/**
* @brief Return current SPI flash operation counters
*
* @return pointer to the spi_flash_counters_t structure holding values
* of the operation counters
*/
const spi_flash_counters_t* spi_flash_get_counters();
#endif //CONFIG_SPI_FLASH_ENABLE_COUNTERS
#ifdef __cplusplus
}
#endif
#endif /* ESP_SPI_FLASH_H */