/****************************************************************************
*
* Copyright (C) 2012-2013 PX4 Development Team. All rights reserved.
* Authors:
* Lorenz Meier <lm@inf.ethz.ch>
* David "Buzz" Bussenschutt <davidbuzz@gmail.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name PX4 nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/**
* @file otp.c
* otp estimation
*
* @author Lorenz Meier <lm@inf.ethz.ch>
* @author David "Buzz" Bussenschutt <davidbuzz@gmail.com>
*
*/
#include <nuttx/config.h>
#include <board_config.h>
#include <stdio.h>
#include <math.h>
#include <unistd.h>
#include <string.h> // memset
#include "conversions.h"
#include "otp.h"
#include "err.h" // warnx
#include <assert.h>
int val_read(void *dest, volatile const void *src, int bytes)
{
int i;
for (i = 0; i < bytes / 4; i++) {
*(((volatile unsigned *)dest) + i) = *(((volatile unsigned *)src) + i);
}
return i * 4;
}
int write_otp(uint8_t id_type, uint32_t vid, uint32_t pid, char *signature)
{
warnx("write_otp: PX4 / %02X / %02X / %02X / ... etc \n", id_type, vid, pid);
int errors = 0;
// descriptor
if (F_write_byte(ADDR_OTP_START, 'P'))
errors++;
// write the 'P' from PX4. to first byte in OTP
if (F_write_byte(ADDR_OTP_START + 1, 'X'))
errors++; // write the 'P' from PX4. to first byte in OTP
if (F_write_byte(ADDR_OTP_START + 2, '4'))
errors++;
if (F_write_byte(ADDR_OTP_START + 3, '\0'))
errors++;
//id_type
if (F_write_byte(ADDR_OTP_START + 4, id_type))
errors++;
// vid and pid are 4 bytes each
if (F_write_word(ADDR_OTP_START + 5, vid))
errors++;
if (F_write_word(ADDR_OTP_START + 9, pid))
errors++;
// leave some 19 bytes of space, and go to the next block...
// then the auth sig starts
for (int i = 0 ; i < 128 ; i++) {
if (F_write_byte(ADDR_OTP_START + 32 + i, signature[i]))
errors++;
}
return errors;
}
int lock_otp(void)
{
//determine the required locking size - can only write full lock bytes */
// int size = sizeof(struct otp) / 32;
//
// struct otp_lock otp_lock_mem;
//
// memset(&otp_lock_mem, OTP_LOCK_UNLOCKED, sizeof(otp_lock_mem));
// for (int i = 0; i < sizeof(otp_lock_mem) / sizeof(otp_lock_mem.lock_bytes[0]); i++)
// otp_lock_mem.lock_bytes[i] = OTP_LOCK_LOCKED;
//XXX add the actual call here to write the OTP_LOCK bytes only at final stage
// val_copy(lock_ptr, &otp_lock_mem, sizeof(otp_lock_mem));
int locksize = 5;
int errors = 0;
// or just realise it's exctly 5x 32byte blocks we need to lock. 1 block for ID,type,vid,pid, and 4 blocks for certificate, which is 128 bytes.
for (int i = 0 ; i < locksize ; i++) {
if (F_write_byte(ADDR_OTP_LOCK_START + i, OTP_LOCK_LOCKED))
errors++;
}
return errors;
}
// COMPLETE, BUSY, or other flash error?
static int F_GetStatus(void)
{
int fs = F_COMPLETE;
if ((FLASH->status & F_BSY) == F_BSY) { fs = F_BUSY; } else {
if ((FLASH->status & F_WRPERR) != (uint32_t)0x00) { fs = F_ERROR_WRP; } else {
if ((FLASH->status & (uint32_t)0xEF) != (uint32_t)0x00) { fs = F_ERROR_PROGRAM; } else {
if ((FLASH->status & F_OPERR) != (uint32_t)0x00) { fs = F_ERROR_OPERATION; } else {
fs = F_COMPLETE;
}
}
}
}
return fs;
}
// enable FLASH Registers
void F_unlock(void)
{
if ((FLASH->control & F_CR_LOCK) != 0) {
FLASH->key = F_KEY1;
FLASH->key = F_KEY2;
}
}
// lock the FLASH Registers
void F_lock(void)
{
FLASH->control |= F_CR_LOCK;
}
// flash write word.
int F_write_word(uint32_t Address, uint32_t Data)
{
unsigned char octet[4] = {0, 0, 0, 0};
int ret = 0;
for (int i = 0; i < 4; i++) {
octet[i] = (Data >> (i * 8)) & 0xFF;
ret = F_write_byte(Address + i, octet[i]);
}
return ret;
}
// flash write byte
int F_write_byte(uint32_t Address, uint8_t Data)
{
volatile int status = F_COMPLETE;
//warnx("F_write_byte: %08X %02d", Address , Data ) ;
//Check the parameters
assert(IS_F_ADDRESS(Address));
//Wait for FLASH operation to complete by polling on BUSY flag.
status = F_GetStatus();
while (status == F_BUSY) { status = F_GetStatus();}
if (status == F_COMPLETE) {
//if the previous operation is completed, proceed to program the new data
FLASH->control &= CR_PSIZE_MASK;
FLASH->control |= F_PSIZE_BYTE;
FLASH->control |= F_CR_PG;
*(volatile uint8_t *)Address = Data;
//Wait for FLASH operation to complete by polling on BUSY flag.
status = F_GetStatus();
while (status == F_BUSY) { status = F_GetStatus();}
//if the program operation is completed, disable the PG Bit
FLASH->control &= (~F_CR_PG);
}
//Return the Program Status
return !(status == F_COMPLETE);
}
