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a2d8544931
to make the flight code compile again. Needs careful review, particularly all the fixes for the signed vs unsigned comparisons. +review OPReview-459
338 lines
8.7 KiB
C
338 lines
8.7 KiB
C
/**
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******************************************************************************
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* @file pios_flash_internal.c
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* @author PhoenixPilot, http://github.com/PhoenixPilot, Copyright (C) 2012
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* @addtogroup
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* @{
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* @addtogroup
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* @{
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* @brief Provides a flash driver for the STM32 internal flash sectors
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*****************************************************************************/
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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, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "pios.h"
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#ifdef PIOS_INCLUDE_FLASH_INTERNAL
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#include "stm32f4xx_flash.h"
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#include "pios_flash_internal_priv.h"
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#include "pios_flash.h"
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#include <stdbool.h>
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struct device_flash_sector {
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uint32_t start;
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uint32_t size;
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uint16_t st_sector;
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};
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static struct device_flash_sector flash_sectors[] = {
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[0] = {
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.start = 0x08000000,
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.size = 16 * 1024,
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.st_sector = FLASH_Sector_0,
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},
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[1] = {
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.start = 0x08004000,
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.size = 16 * 1024,
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.st_sector = FLASH_Sector_1,
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},
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[2] = {
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.start = 0x08008000,
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.size = 16 * 1024,
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.st_sector = FLASH_Sector_2,
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},
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[3] = {
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.start = 0x0800C000,
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.size = 16 * 1024,
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.st_sector = FLASH_Sector_3,
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},
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[4] = {
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.start = 0x08010000,
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.size = 64 * 1024,
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.st_sector = FLASH_Sector_4,
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},
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[5] = {
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.start = 0x08020000,
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.size = 128 * 1024,
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.st_sector = FLASH_Sector_5,
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},
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[6] = {
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.start = 0x08040000,
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.size = 128 * 1024,
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.st_sector = FLASH_Sector_6,
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},
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[7] = {
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.start = 0x08060000,
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.size = 128 * 1024,
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.st_sector = FLASH_Sector_7,
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},
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[8] = {
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.start = 0x08080000,
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.size = 128 * 1024,
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.st_sector = FLASH_Sector_8,
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},
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[9] = {
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.start = 0x080A0000,
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.size = 128 * 1024,
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.st_sector = FLASH_Sector_9,
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},
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[10] = {
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.start = 0x080C0000,
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.size = 128 * 1024,
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.st_sector = FLASH_Sector_10,
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},
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[11] = {
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.start = 0x080E0000,
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.size = 128 * 1024,
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.st_sector = FLASH_Sector_11,
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},
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};
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static bool PIOS_Flash_Internal_GetSectorInfo(uint32_t address, uint8_t * sector_number, uint32_t *sector_start, uint32_t *sector_size)
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{
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for (uint8_t i = 0; i < NELEMENTS(flash_sectors); i++) {
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struct device_flash_sector * sector = &flash_sectors[i];
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if ((address >= sector->start) &&
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(address < (sector->start + sector->size))) {
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/* address lies within this sector */
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*sector_number = sector->st_sector;
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*sector_start = sector->start;
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*sector_size = sector->size;
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return (true);
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}
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}
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return (false);
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}
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enum pios_internal_flash_dev_magic {
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PIOS_INTERNAL_FLASH_DEV_MAGIC = 0x33445902,
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};
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struct pios_internal_flash_dev {
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enum pios_internal_flash_dev_magic magic;
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#if defined(PIOS_INCLUDE_FREERTOS)
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xSemaphoreHandle transaction_lock;
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#endif /* defined(PIOS_INCLUDE_FREERTOS) */
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};
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static bool PIOS_Flash_Internal_Validate(struct pios_internal_flash_dev * flash_dev) {
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return (flash_dev && (flash_dev->magic == PIOS_INTERNAL_FLASH_DEV_MAGIC));
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}
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#if defined(PIOS_INCLUDE_FREERTOS)
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static struct pios_internal_flash_dev * PIOS_Flash_Internal_alloc(void)
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{
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struct pios_internal_flash_dev * flash_dev;
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flash_dev = (struct pios_internal_flash_dev *)pvPortMalloc(sizeof(* flash_dev));
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if (!flash_dev) return (NULL);
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flash_dev->magic = PIOS_INTERNAL_FLASH_DEV_MAGIC;
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return(flash_dev);
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}
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#else
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static struct pios_internal_flash_dev pios_internal_flash_devs[PIOS_INTERNAL_FLASH_MAX_DEVS];
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static uint8_t pios_internal_flash_num_devs;
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static struct pios_internal_flash_dev * PIOS_Flash_Internal_alloc(void)
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{
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struct pios_internal_flash_dev * flash_dev;
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if (pios_internal_flash_num_devs >= PIOS_INTERNAL_FLASH_MAX_DEVS) {
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return (NULL);
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}
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flash_dev = &pios_internal_flash_devs[pios_internal_flash_num_devs++];
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flash_dev->magic = PIOS_INTERNAL_FLASH_DEV_MAGIC;
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return (flash_dev);
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}
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#endif /* defined(PIOS_INCLUDE_FREERTOS) */
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int32_t PIOS_Flash_Internal_Init(uintptr_t * flash_id, __attribute__((unused)) const struct pios_flash_internal_cfg * cfg)
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{
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struct pios_internal_flash_dev * flash_dev;
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flash_dev = PIOS_Flash_Internal_alloc();
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if (flash_dev == NULL)
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return -1;
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#if defined(PIOS_INCLUDE_FREERTOS)
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flash_dev->transaction_lock = xSemaphoreCreateMutex();
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#endif /* defined(PIOS_INCLUDE_FREERTOS) */
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*flash_id = (uintptr_t) flash_dev;
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return 0;
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}
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/**********************************
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*
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* Provide a PIOS flash driver API
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*
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*********************************/
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#include "pios_flash.h"
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static int32_t PIOS_Flash_Internal_StartTransaction(uintptr_t flash_id)
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{
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struct pios_internal_flash_dev * flash_dev = (struct pios_internal_flash_dev *)flash_id;
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if (!PIOS_Flash_Internal_Validate(flash_dev))
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return -1;
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#if defined(PIOS_INCLUDE_FREERTOS)
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if (xSemaphoreTake(flash_dev->transaction_lock, portMAX_DELAY) != pdTRUE)
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return -2;
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#endif /* defined(PIOS_INCLUDE_FREERTOS) */
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/* Unlock the internal flash so we can write to it */
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FLASH_Unlock();
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return 0;
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}
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static int32_t PIOS_Flash_Internal_EndTransaction(uintptr_t flash_id)
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{
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struct pios_internal_flash_dev * flash_dev = (struct pios_internal_flash_dev *)flash_id;
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if (!PIOS_Flash_Internal_Validate(flash_dev))
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return -1;
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#if defined(PIOS_INCLUDE_FREERTOS)
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if (xSemaphoreGive(flash_dev->transaction_lock) != pdTRUE)
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return -2;
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#endif /* defined(PIOS_INCLUDE_FREERTOS) */
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/* Lock the internal flash again so we can no longer write to it */
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FLASH_Lock();
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return 0;
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}
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static int32_t PIOS_Flash_Internal_EraseSector(uintptr_t flash_id, uint32_t addr)
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{
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struct pios_internal_flash_dev * flash_dev = (struct pios_internal_flash_dev *)flash_id;
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if (!PIOS_Flash_Internal_Validate(flash_dev))
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return -1;
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uint8_t sector_number;
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uint32_t sector_start;
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uint32_t sector_size;
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if (!PIOS_Flash_Internal_GetSectorInfo(addr,
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§or_number,
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§or_start,
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§or_size)) {
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/* We're asking for an invalid flash address */
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return -2;
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}
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if (FLASH_EraseSector(sector_number, VoltageRange_3) != FLASH_COMPLETE)
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return -3;
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return 0;
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}
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static int32_t PIOS_Flash_Internal_WriteData(uintptr_t flash_id, uint32_t addr, uint8_t * data, uint16_t len)
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{
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PIOS_Assert(data);
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struct pios_internal_flash_dev * flash_dev = (struct pios_internal_flash_dev *)flash_id;
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if (!PIOS_Flash_Internal_Validate(flash_dev))
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return -1;
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uint8_t sector_number;
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uint32_t sector_start;
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uint32_t sector_size;
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/* Ensure that the base address is in a valid sector */
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if (!PIOS_Flash_Internal_GetSectorInfo(addr,
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§or_number,
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§or_start,
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§or_size)) {
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/* We're asking for an invalid flash address */
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return -2;
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}
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/* Ensure that the entire write occurs within the same sector */
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if ((uintptr_t)addr + len > sector_start + sector_size) {
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/* Write crosses the end of the sector */
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return -3;
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}
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/* Write the data */
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for (uint16_t i = 0; i < len; i++) {
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FLASH_Status status;
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/*
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* This is inefficient. Should try to do word writes.
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* Not sure if word writes need to be aligned though.
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*/
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status = FLASH_ProgramByte(addr + i, data[i]);
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PIOS_Assert(status == FLASH_COMPLETE);
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}
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return 0;
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}
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static int32_t PIOS_Flash_Internal_ReadData(uintptr_t flash_id, uint32_t addr, uint8_t * data, uint16_t len)
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{
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PIOS_Assert(data);
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struct pios_internal_flash_dev * flash_dev = (struct pios_internal_flash_dev *)flash_id;
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if (!PIOS_Flash_Internal_Validate(flash_dev))
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return -1;
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uint8_t sector_number;
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uint32_t sector_start;
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uint32_t sector_size;
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/* Ensure that the base address is in a valid sector */
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if (!PIOS_Flash_Internal_GetSectorInfo(addr,
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§or_number,
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§or_start,
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§or_size)) {
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/* We're asking for an invalid flash address */
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return -2;
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}
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/* Ensure that the entire read occurs within the same sector */
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if ((uintptr_t)addr + len > sector_start + sector_size) {
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/* Read crosses the end of the sector */
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return -3;
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}
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/* Read the data into the buffer directly */
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memcpy(data, (void *)addr, len);
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return 0;
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}
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/* Provide a flash driver to external drivers */
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const struct pios_flash_driver pios_internal_flash_driver = {
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.start_transaction = PIOS_Flash_Internal_StartTransaction,
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.end_transaction = PIOS_Flash_Internal_EndTransaction,
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.erase_sector = PIOS_Flash_Internal_EraseSector,
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.write_data = PIOS_Flash_Internal_WriteData,
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.read_data = PIOS_Flash_Internal_ReadData,
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};
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#endif /* PIOS_INCLUDE_FLASH_INTERNAL */
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