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/***************************************************************
*
* OpenBeacon.org - flash routines for persistent environment
*
* Copyright 2007 Milosch Meriac <meriac@openbeacon.de>
*
***************************************************************
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; version 2.
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.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <FreeRTOS.h>
#include <AT91SAM7.h>
#include <lib_AT91SAM7.h>
#include <string.h>
#include <board.h>
#include <task.h>
#include "env.h"
#define EFCS_CMD_WRITE_PAGE 0x1
#define EFCS_CMD_SET_LOCK_BIT 0x2
#define EFCS_CMD_WRITE_PAGE_LOCK 0x3
#define EFCS_CMD_CLEAR_LOCK 0x4
#define EFCS_CMD_ERASE_ALL 0x8
#define EFCS_CMD_SET_NVM_BIT 0xb
#define EFCS_CMD_CLEAR_NVM_BIT 0xd
#define EFCS_CMD_SET_SECURITY_BIT 0xf
#define PAGES_PER_LOCKREGION (AT91C_IFLASH_LOCK_REGION_SIZE>>AT91C_IFLASH_PAGE_SHIFT)
#define IS_FIRST_PAGE_OF_LOCKREGION(x) ((x % PAGES_PER_LOCKREGION) == 0)
#define LOCKREGION_FROM_PAGE(x) (x / PAGES_PER_LOCKREGION)
#define ENV_FLASH ((unsigned int *)AT91C_IFLASH + AT91C_IFLASH_SIZE - ENVIRONMENT_SIZE)
TEnvironmentBlock env;
static inline unsigned short RAMFUNC page_from_ramaddr(const void *addr)
{
unsigned long ramaddr = (unsigned long) addr;
ramaddr -= (unsigned long) AT91C_IFLASH;
return ((ramaddr >> AT91C_IFLASH_PAGE_SHIFT));
}
static inline int RAMFUNC is_page_locked(unsigned short page)
{
unsigned short lockregion = LOCKREGION_FROM_PAGE(page);
return (AT91C_BASE_MC->MC_FSR & (lockregion << 16));
}
static inline void RAMFUNC flash_cmd_wait(void)
{
while(( *AT91C_MC_FSR & AT91C_MC_FRDY ) != AT91C_MC_FRDY );
}
static inline void RAMFUNC unlock_page(unsigned short page)
{
page &= 0x3ff;
AT91F_MC_EFC_PerformCmd(AT91C_BASE_MC, AT91C_MC_FCMD_UNLOCK |
AT91C_MC_CORRECT_KEY | (page << 8));
flash_cmd_wait();
}
static inline void RAMFUNC flash_page(const void *addr)
{
unsigned short page = page_from_ramaddr(addr) & 0x3ff;
if (is_page_locked(page))
unlock_page(page);
AT91F_MC_EFC_PerformCmd(AT91C_BASE_MC, AT91C_MC_FCMD_START_PROG |
AT91C_MC_CORRECT_KEY | (page << 8));
flash_cmd_wait();
}
unsigned short RAMFUNC env_crc16 (const unsigned char *buffer, int size)
{
unsigned short crc = 0xFFFF;
if(buffer && size)
while (size--)
{
crc = (crc >> 8) | (crc << 8);
crc ^= *buffer++;
crc ^= ((unsigned char) crc) >> 4;
crc ^= crc << 12;
crc ^= (crc & 0xFF) << 5;
}
return crc;
}
void RAMFUNC env_store(void)
{
unsigned int i,*src,*dst;
/* During flashing only RAMFUNC code may be executed.
* For now, this means that no other code whatsoever may
* be run until this function returns. */
vTaskSuspendAll();
portENTER_CRITICAL();
env.e.magic=TENVIRONMENT_MAGIC;
env.e.crc16=0;
env.e.size=sizeof(env);
env.e.crc16=env_crc16((unsigned char*)&env,sizeof(env));
src=env.data;
dst=ENV_FLASH;
for (i = 0; i < (sizeof(env.data)/sizeof(env.data[0])); i++)
*dst++ = *src++;
flash_page(ENV_FLASH);
portEXIT_CRITICAL();
xTaskResumeAll();
}
int env_load(void)
{
unsigned int crc;
memcpy(&env,ENV_FLASH,sizeof(env));
if(env.e.magic!=TENVIRONMENT_MAGIC || env.e.size!=sizeof(env) )
return 0;
crc=env.e.crc16;
env.e.crc16=0;
return env_crc16((unsigned char*)&env,sizeof(env))==crc;
}
void env_init(void)
{
unsigned int fmcn = AT91F_MC_EFC_ComputeFMCN(MCK);
AT91F_MC_EFC_CfgModeReg(AT91C_BASE_MC, fmcn << 16 | AT91C_MC_FWS_3FWS);
}
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