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Diffstat (limited to 'src/modules/systemlib/otp.c')
| -rw-r--r-- | src/modules/systemlib/otp.c | 224 |
1 files changed, 224 insertions, 0 deletions
diff --git a/src/modules/systemlib/otp.c b/src/modules/systemlib/otp.c new file mode 100644 index 000000000..695574fdc --- /dev/null +++ b/src/modules/systemlib/otp.c @@ -0,0 +1,224 @@ +/**************************************************************************** + * + * 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? +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); +} + + + |