forked from Minki/linux
820684cc26
Adopt the SPDX license identifiers to ease license compliance management. Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
117 lines
3.1 KiB
C
117 lines
3.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* Copyright (c) 2017, Microchip Technology Inc.
|
|
* Author: Tudor Ambarus <tudor.ambarus@microchip.com>
|
|
*/
|
|
|
|
#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__ */
|