/*
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* Copyright (c) 2017, Microchip Technology Inc.
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* Author: Tudor Ambarus <tudor.ambarus@microchip.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef __ATMEL_ECC_H__
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#define __ATMEL_ECC_H__
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#define ATMEL_ECC_PRIORITY 300
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#define COMMAND 0x03 /* packet function */
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#define SLEEP_TOKEN 0x01
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#define WAKE_TOKEN_MAX_SIZE 8
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/* Definitions of Data and Command sizes */
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#define WORD_ADDR_SIZE 1
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#define COUNT_SIZE 1
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#define CRC_SIZE 2
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#define CMD_OVERHEAD_SIZE (COUNT_SIZE + CRC_SIZE)
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/* size in bytes of the n prime */
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#define ATMEL_ECC_NIST_P256_N_SIZE 32
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#define ATMEL_ECC_PUBKEY_SIZE (2 * ATMEL_ECC_NIST_P256_N_SIZE)
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#define STATUS_RSP_SIZE 4
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#define ECDH_RSP_SIZE (32 + CMD_OVERHEAD_SIZE)
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#define GENKEY_RSP_SIZE (ATMEL_ECC_PUBKEY_SIZE + \
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CMD_OVERHEAD_SIZE)
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#define READ_RSP_SIZE (4 + CMD_OVERHEAD_SIZE)
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#define MAX_RSP_SIZE GENKEY_RSP_SIZE
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/**
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* atmel_ecc_cmd - structure used for communicating with the device.
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* @word_addr: indicates the function of the packet sent to the device. This
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* byte should have a value of COMMAND for normal operation.
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* @count : number of bytes to be transferred to (or from) the device.
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* @opcode : the command code.
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* @param1 : the first parameter; always present.
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* @param2 : the second parameter; always present.
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* @data : optional remaining input data. Includes a 2-byte CRC.
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* @rxsize : size of the data received from i2c client.
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* @msecs : command execution time in milliseconds
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*/
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struct atmel_ecc_cmd {
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u8 word_addr;
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u8 count;
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u8 opcode;
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u8 param1;
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u16 param2;
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u8 data[MAX_RSP_SIZE];
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u8 msecs;
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u16 rxsize;
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} __packed;
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/* Status/Error codes */
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#define STATUS_SIZE 0x04
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#define STATUS_NOERR 0x00
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#define STATUS_WAKE_SUCCESSFUL 0x11
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static const struct {
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u8 value;
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const char *error_text;
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} error_list[] = {
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{ 0x01, "CheckMac or Verify miscompare" },
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{ 0x03, "Parse Error" },
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{ 0x05, "ECC Fault" },
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{ 0x0F, "Execution Error" },
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{ 0xEE, "Watchdog about to expire" },
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{ 0xFF, "CRC or other communication error" },
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};
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/* Definitions for eeprom organization */
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#define CONFIG_ZONE 0
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/* Definitions for Indexes common to all commands */
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#define RSP_DATA_IDX 1 /* buffer index of data in response */
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#define DATA_SLOT_2 2 /* used for ECDH private key */
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/* Definitions for the device lock state */
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#define DEVICE_LOCK_ADDR 0x15
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#define LOCK_VALUE_IDX (RSP_DATA_IDX + 2)
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#define LOCK_CONFIG_IDX (RSP_DATA_IDX + 3)
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/*
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* Wake High delay to data communication (microseconds). SDA should be stable
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* high for this entire duration.
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*/
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#define TWHI_MIN 1500
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#define TWHI_MAX 1550
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/* Wake Low duration */
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#define TWLO_USEC 60
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/* Command execution time (milliseconds) */
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#define MAX_EXEC_TIME_ECDH 58
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#define MAX_EXEC_TIME_GENKEY 115
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#define MAX_EXEC_TIME_READ 1
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/* Command opcode */
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#define OPCODE_ECDH 0x43
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#define OPCODE_GENKEY 0x40
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#define OPCODE_READ 0x02
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/* Definitions for the READ Command */
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#define READ_COUNT 7
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/* Definitions for the GenKey Command */
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#define GENKEY_COUNT 7
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#define GENKEY_MODE_PRIVATE 0x04
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/* Definitions for the ECDH Command */
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#define ECDH_COUNT 71
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#define ECDH_PREFIX_MODE 0x00
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#endif /* __ATMEL_ECC_H__ */
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