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LibrePilot/flight/pios/stm32f0x/pios_flash_internal.c

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/**
******************************************************************************
*
* @file pios_flash_internal.c
* @author The OpenPilot Team, http://www.openpilot.org Copyright (C) 2013.
* @brief brief goes here.
* --
* @see The GNU Public License (GPL) Version 3
*
*****************************************************************************/
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "pios.h"
#ifdef PIOS_INCLUDE_FLASH_INTERNAL
#include "stm32f0xx_flash.h"
#include "pios_flash_internal_priv.h"
#include "pios_flash.h"
#include <stdbool.h>
struct device_flash_sector {
uint32_t start;
uint32_t size;
uint16_t st_sector;
};
static bool PIOS_Flash_Internal_GetSectorInfo(uint32_t address, uint8_t *sector_number, uint32_t *sector_start, uint32_t *sector_size)
{
uint16_t sector = (address - 0x08000000) / 1024;
if (sector <= 127) {
/* address lies within this sector */
*sector_number = sector;
*sector_start = sector * 1024 + 0x08000000;
*sector_size = 1024;
return true;
}
return false;
}
enum pios_internal_flash_dev_magic {
PIOS_INTERNAL_FLASH_DEV_MAGIC = 0x33445902,
};
struct pios_internal_flash_dev {
enum pios_internal_flash_dev_magic magic;
#if defined(PIOS_INCLUDE_FREERTOS)
xSemaphoreHandle transaction_lock;
#endif /* defined(PIOS_INCLUDE_FREERTOS) */
};
static bool PIOS_Flash_Internal_Validate(struct pios_internal_flash_dev *flash_dev)
{
return flash_dev && (flash_dev->magic == PIOS_INTERNAL_FLASH_DEV_MAGIC);
}
#if defined(PIOS_INCLUDE_FREERTOS)
static struct pios_internal_flash_dev *PIOS_Flash_Internal_alloc(void)
{
struct pios_internal_flash_dev *flash_dev;
flash_dev = (struct pios_internal_flash_dev *)pvPortMalloc(sizeof(*flash_dev));
if (!flash_dev) {
return NULL;
}
flash_dev->magic = PIOS_INTERNAL_FLASH_DEV_MAGIC;
return flash_dev;
}
#else
static struct pios_internal_flash_dev pios_internal_flash_devs[PIOS_INTERNAL_FLASH_MAX_DEVS];
static uint8_t pios_internal_flash_num_devs;
static struct pios_internal_flash_dev *PIOS_Flash_Internal_alloc(void)
{
struct pios_internal_flash_dev *flash_dev;
if (pios_internal_flash_num_devs >= PIOS_INTERNAL_FLASH_MAX_DEVS) {
return NULL;
}
flash_dev = &pios_internal_flash_devs[pios_internal_flash_num_devs++];
flash_dev->magic = PIOS_INTERNAL_FLASH_DEV_MAGIC;
return flash_dev;
}
#endif /* defined(PIOS_INCLUDE_FREERTOS) */
int32_t PIOS_Flash_Internal_Init(uintptr_t *flash_id, __attribute__((unused)) const struct pios_flash_internal_cfg *cfg)
{
struct pios_internal_flash_dev *flash_dev;
flash_dev = PIOS_Flash_Internal_alloc();
if (flash_dev == NULL) {
return -1;
}
#if defined(PIOS_INCLUDE_FREERTOS)
flash_dev->transaction_lock = xSemaphoreCreateMutex();
#endif /* defined(PIOS_INCLUDE_FREERTOS) */
*flash_id = (uintptr_t)flash_dev;
return 0;
}
/**********************************
*
* Provide a PIOS flash driver API
*
*********************************/
#include "pios_flash.h"
static int32_t PIOS_Flash_Internal_StartTransaction(uintptr_t flash_id)
{
struct pios_internal_flash_dev *flash_dev = (struct pios_internal_flash_dev *)flash_id;
if (!PIOS_Flash_Internal_Validate(flash_dev)) {
return -1;
}
#if defined(PIOS_INCLUDE_FREERTOS)
if (xSemaphoreTake(flash_dev->transaction_lock, portMAX_DELAY) != pdTRUE) {
return -2;
}
#endif /* defined(PIOS_INCLUDE_FREERTOS) */
/* Unlock the internal flash so we can write to it */
FLASH_Unlock();
return 0;
}
static int32_t PIOS_Flash_Internal_EndTransaction(uintptr_t flash_id)
{
struct pios_internal_flash_dev *flash_dev = (struct pios_internal_flash_dev *)flash_id;
if (!PIOS_Flash_Internal_Validate(flash_dev)) {
return -1;
}
#if defined(PIOS_INCLUDE_FREERTOS)
if (xSemaphoreGive(flash_dev->transaction_lock) != pdTRUE) {
return -2;
}
#endif /* defined(PIOS_INCLUDE_FREERTOS) */
/* Lock the internal flash again so we can no longer write to it */
FLASH_Lock();
return 0;
}
static int32_t PIOS_Flash_Internal_EraseSector(uintptr_t flash_id, uint32_t addr)
{
struct pios_internal_flash_dev *flash_dev = (struct pios_internal_flash_dev *)flash_id;
if (!PIOS_Flash_Internal_Validate(flash_dev)) {
return -1;
}
uint8_t sector_number;
uint32_t sector_start;
uint32_t sector_size;
if (!PIOS_Flash_Internal_GetSectorInfo(addr,
&sector_number,
&sector_start,
&sector_size)) {
/* We're asking for an invalid flash address */
return -2;
}
if (FLASH_ErasePage(sector_start) != FLASH_COMPLETE) {
return -3;
}
return 0;
}
static int32_t PIOS_Flash_Internal_WriteData(uintptr_t flash_id, uint32_t addr, uint8_t *data, uint16_t len)
{
PIOS_Assert(data);
struct pios_internal_flash_dev *flash_dev = (struct pios_internal_flash_dev *)flash_id;
if (!PIOS_Flash_Internal_Validate(flash_dev)) {
return -1;
}
uint8_t sector_number;
uint32_t sector_start;
uint32_t sector_size;
uint32_t hword_data;
uint32_t offset;
/* Ensure that the base address is in a valid sector */
if (!PIOS_Flash_Internal_GetSectorInfo(addr,
&sector_number,
&sector_start,
&sector_size)) {
/* We're asking for an invalid flash address */
return -2;
}
/* Ensure that the entire write occurs within the same sector */
if ((uintptr_t)addr + len > sector_start + sector_size) {
/* Write crosses the end of the sector */
return -3;
}
/* Write the data */
uint32_t temp_addr = addr;
uint16_t numberOfhWords = len / 2;
uint16_t x = 0;
FLASH_Status status;
for (x = 0; x < numberOfhWords; ++x) {
offset = 2 * x;
hword_data = (data[offset + 1] << 8) | data[offset];
if (hword_data != *(uint16_t *)(temp_addr + offset)) {
status = FLASH_ProgramHalfWord(temp_addr + offset, hword_data);
} else {
status = FLASH_COMPLETE;
}
PIOS_Assert(status == FLASH_COMPLETE);
}
uint16_t mod = len % 2;
if (mod == 1) {
offset = 2 * x;
hword_data = 0xFF00 | data[offset];
if (hword_data != *(uint16_t *)(temp_addr + offset)) {
status = FLASH_ProgramHalfWord(temp_addr + offset, hword_data);
} else {
status = FLASH_COMPLETE;
}
PIOS_Assert(status == FLASH_COMPLETE);
}
return 0;
}
static int32_t PIOS_Flash_Internal_ReadData(uintptr_t flash_id, uint32_t addr, uint8_t *data, uint16_t len)
{
PIOS_Assert(data);
struct pios_internal_flash_dev *flash_dev = (struct pios_internal_flash_dev *)flash_id;
if (!PIOS_Flash_Internal_Validate(flash_dev)) {
return -1;
}
uint8_t sector_number;
uint32_t sector_start;
uint32_t sector_size;
/* Ensure that the base address is in a valid sector */
if (!PIOS_Flash_Internal_GetSectorInfo(addr,
&sector_number,
&sector_start,
&sector_size)) {
/* We're asking for an invalid flash address */
return -2;
}
/* Ensure that the entire read occurs within the same sector */
if ((uintptr_t)addr + len > sector_start + sector_size) {
/* Read crosses the end of the sector */
return -3;
}
/* Read the data into the buffer directly */
memcpy(data, (void *)addr, len);
return 0;
}
/* Provide a flash driver to external drivers */
const struct pios_flash_driver pios_internal_flash_driver = {
.start_transaction = PIOS_Flash_Internal_StartTransaction,
.end_transaction = PIOS_Flash_Internal_EndTransaction,
.erase_sector = PIOS_Flash_Internal_EraseSector,
.write_data = PIOS_Flash_Internal_WriteData,
.read_data = PIOS_Flash_Internal_ReadData,
};
#endif /* PIOS_INCLUDE_FLASH_INTERNAL */
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