mirror of
https://github.com/trezor/trezor-firmware.git
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100 lines
3.7 KiB
C
100 lines
3.7 KiB
C
/*
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* This file is part of the Trezor project, https://trezor.io/
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*
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* Copyright (c) SatoshiLabs
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef FLASH_LL_H_
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#define FLASH_LL_H_
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#include <secbool.h>
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#include <stdint.h>
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// Flash memory low-level API, providing abstraction for
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// various flash archictures found on STM32 MCUs
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// The 'sector' parameter in this API can represent
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// 1. Non-uniform sector number on STM32F4
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// 2. Uniform page number on STM32U5
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#define FLASH_QUADWORD_WORDS (4)
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#define FLASH_QUADWORD_SIZE (FLASH_QUADWORD_WORDS * sizeof(uint32_t))
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#define FLASH_BURST_WORDS (8 * FLASH_QUADWORD_WORDS)
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#define FLASH_BURST_SIZE (FLASH_BURST_WORDS * sizeof(uint32_t))
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#define FLASH_BLOCK_SIZE (sizeof(uint32_t) * FLASH_BLOCK_WORDS)
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typedef uint32_t flash_block_t[FLASH_BLOCK_WORDS];
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#if FLASH_BLOCK_WORDS == 1
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#define FLASH_ALIGN(X) (((X) + 3) & ~3)
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#define FLASH_IS_ALIGNED(X) (((X) & 3) == 0)
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#elif FLASH_BLOCK_WORDS == 4
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#define FLASH_ALIGN(X) (((X) + 0xF) & ~0xF)
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#define FLASH_IS_ALIGNED(X) (((X) & 0xF) == 0)
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#else
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#error Unsupported number of FLASH_BLOCK_WORDS.
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#endif
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// Returns the size of the a continuous area of sectors
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// Returns 0 if any of the sectors is out of range
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uint32_t flash_sector_size(uint16_t first_sector, uint16_t sector_count);
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// Returns number of the sector/page at specified byte 'offset'
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// from the beginning of the 'first_sector'
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uint16_t flash_sector_find(uint16_t first_sector, uint32_t offset);
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// Returns the physical address of a byte on specified 'offset' in the specified
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// 'sector'. Checks if it's possible to access continues space of 'size' bytes
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// Returns NULL i [offset, offset + size] is of out of the specified sector
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const void *flash_get_address(uint16_t sector, uint32_t offset, uint32_t size);
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// Unlocks the flash memory for writes/erase operations
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// Flash must be locked again as soon as possible
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secbool __wur flash_unlock_write(void);
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// Locks the flash memory for writes/erase operations
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secbool __wur flash_lock_write(void);
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#if defined FLASH_BIT_ACCESS
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// Writes a single byte to the specified 'offset' inside a flash 'sector'
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secbool __wur flash_write_byte(uint16_t sector, uint32_t offset, uint8_t data);
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// Writes a single 32-bit word to the specified 'offset' inside a flash 'sector'
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secbool __wur flash_write_word(uint16_t sector, uint32_t offset, uint32_t data);
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#endif
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// Writes a 16-byte block to specified 'offset' inside a flash 'sector'
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secbool __wur flash_write_quadword(uint16_t sector, uint32_t offset,
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const uint32_t *data);
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// Writes a 128-byte burst to specified 'offset' inside a flash 'sector'
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secbool __wur flash_write_burst(uint16_t sector, uint32_t offset,
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const uint32_t *data);
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// Erases a single sector/page of flash memory
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secbool __wur flash_sector_erase(uint16_t sector);
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// Writes a block to specified 'offset' inside a flash 'sector'
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// Block represents a natural unit of the given flash memory
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secbool flash_write_block(uint16_t sector, uint32_t offset,
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const flash_block_t block);
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#endif // FLASH_LL_H
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