| /* | |
| * Copyright (c) 2017, Microchip Technology Inc. | |
| * Author: Tudor Ambarus <tudor.ambarus@microchip.com> | |
| * | |
| * This program is free software; you can redistribute it and/or modify | |
| * it under the terms of the GNU General Public License version 2 as | |
| * published by the Free Software Foundation. | |
| * | |
| * 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, see <http://www.gnu.org/licenses/>. | |
| * | |
| */ | |
| #ifndef __ATMEL_ECC_H__ | |
| #define __ATMEL_ECC_H__ | |
| #define ATMEL_ECC_PRIORITY 300 | |
| #define COMMAND 0x03 /* packet function */ | |
| #define SLEEP_TOKEN 0x01 | |
| #define WAKE_TOKEN_MAX_SIZE 8 | |
| /* Definitions of Data and Command sizes */ | |
| #define WORD_ADDR_SIZE 1 | |
| #define COUNT_SIZE 1 | |
| #define CRC_SIZE 2 | |
| #define CMD_OVERHEAD_SIZE (COUNT_SIZE + CRC_SIZE) | |
| /* size in bytes of the n prime */ | |
| #define ATMEL_ECC_NIST_P256_N_SIZE 32 | |
| #define ATMEL_ECC_PUBKEY_SIZE (2 * ATMEL_ECC_NIST_P256_N_SIZE) | |
| #define STATUS_RSP_SIZE 4 | |
| #define ECDH_RSP_SIZE (32 + CMD_OVERHEAD_SIZE) | |
| #define GENKEY_RSP_SIZE (ATMEL_ECC_PUBKEY_SIZE + \ | |
| CMD_OVERHEAD_SIZE) | |
| #define READ_RSP_SIZE (4 + CMD_OVERHEAD_SIZE) | |
| #define MAX_RSP_SIZE GENKEY_RSP_SIZE | |
| /** | |
| * atmel_ecc_cmd - structure used for communicating with the device. | |
| * @word_addr: indicates the function of the packet sent to the device. This | |
| * byte should have a value of COMMAND for normal operation. | |
| * @count : number of bytes to be transferred to (or from) the device. | |
| * @opcode : the command code. | |
| * @param1 : the first parameter; always present. | |
| * @param2 : the second parameter; always present. | |
| * @data : optional remaining input data. Includes a 2-byte CRC. | |
| * @rxsize : size of the data received from i2c client. | |
| * @msecs : command execution time in milliseconds | |
| */ | |
| struct atmel_ecc_cmd { | |
| u8 word_addr; | |
| u8 count; | |
| u8 opcode; | |
| u8 param1; | |
| u16 param2; | |
| u8 data[MAX_RSP_SIZE]; | |
| u8 msecs; | |
| u16 rxsize; | |
| } __packed; | |
| /* Status/Error codes */ | |
| #define STATUS_SIZE 0x04 | |
| #define STATUS_NOERR 0x00 | |
| #define STATUS_WAKE_SUCCESSFUL 0x11 | |
| static const struct { | |
| u8 value; | |
| const char *error_text; | |
| } error_list[] = { | |
| { 0x01, "CheckMac or Verify miscompare" }, | |
| { 0x03, "Parse Error" }, | |
| { 0x05, "ECC Fault" }, | |
| { 0x0F, "Execution Error" }, | |
| { 0xEE, "Watchdog about to expire" }, | |
| { 0xFF, "CRC or other communication error" }, | |
| }; | |
| /* Definitions for eeprom organization */ | |
| #define CONFIG_ZONE 0 | |
| /* Definitions for Indexes common to all commands */ | |
| #define RSP_DATA_IDX 1 /* buffer index of data in response */ | |
| #define DATA_SLOT_2 2 /* used for ECDH private key */ | |
| /* Definitions for the device lock state */ | |
| #define DEVICE_LOCK_ADDR 0x15 | |
| #define LOCK_VALUE_IDX (RSP_DATA_IDX + 2) | |
| #define LOCK_CONFIG_IDX (RSP_DATA_IDX + 3) | |
| /* | |
| * Wake High delay to data communication (microseconds). SDA should be stable | |
| * high for this entire duration. | |
| */ | |
| #define TWHI_MIN 1500 | |
| #define TWHI_MAX 1550 | |
| /* Wake Low duration */ | |
| #define TWLO_USEC 60 | |
| /* Command execution time (milliseconds) */ | |
| #define MAX_EXEC_TIME_ECDH 58 | |
| #define MAX_EXEC_TIME_GENKEY 115 | |
| #define MAX_EXEC_TIME_READ 1 | |
| /* Command opcode */ | |
| #define OPCODE_ECDH 0x43 | |
| #define OPCODE_GENKEY 0x40 | |
| #define OPCODE_READ 0x02 | |
| /* Definitions for the READ Command */ | |
| #define READ_COUNT 7 | |
| /* Definitions for the GenKey Command */ | |
| #define GENKEY_COUNT 7 | |
| #define GENKEY_MODE_PRIVATE 0x04 | |
| /* Definitions for the ECDH Command */ | |
| #define ECDH_COUNT 71 | |
| #define ECDH_PREFIX_MODE 0x00 | |
| #endif /* __ATMEL_ECC_H__ */ |