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1/*
2 * Copyright (c) 2017, Microchip Technology Inc.
3 * Author: Tudor Ambarus <tudor.ambarus@microchip.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program. If not, see <http://www.gnu.org/licenses/>.
16 *
17 */
18
19#ifndef __ATMEL_ECC_H__
20#define __ATMEL_ECC_H__
21
22#define ATMEL_ECC_PRIORITY 300
23
24#define COMMAND 0x03 /* packet function */
25#define SLEEP_TOKEN 0x01
26#define WAKE_TOKEN_MAX_SIZE 8
27
28/* Definitions of Data and Command sizes */
29#define WORD_ADDR_SIZE 1
30#define COUNT_SIZE 1
31#define CRC_SIZE 2
32#define CMD_OVERHEAD_SIZE (COUNT_SIZE + CRC_SIZE)
33
34/* size in bytes of the n prime */
35#define ATMEL_ECC_NIST_P256_N_SIZE 32
36#define ATMEL_ECC_PUBKEY_SIZE (2 * ATMEL_ECC_NIST_P256_N_SIZE)
37
38#define STATUS_RSP_SIZE 4
39#define ECDH_RSP_SIZE (32 + CMD_OVERHEAD_SIZE)
40#define GENKEY_RSP_SIZE (ATMEL_ECC_PUBKEY_SIZE + \
41 CMD_OVERHEAD_SIZE)
42#define READ_RSP_SIZE (4 + CMD_OVERHEAD_SIZE)
43#define MAX_RSP_SIZE GENKEY_RSP_SIZE
44
45/**
46 * atmel_ecc_cmd - structure used for communicating with the device.
47 * @word_addr: indicates the function of the packet sent to the device. This
48 * byte should have a value of COMMAND for normal operation.
49 * @count : number of bytes to be transferred to (or from) the device.
50 * @opcode : the command code.
51 * @param1 : the first parameter; always present.
52 * @param2 : the second parameter; always present.
53 * @data : optional remaining input data. Includes a 2-byte CRC.
54 * @rxsize : size of the data received from i2c client.
55 * @msecs : command execution time in milliseconds
56 */
57struct atmel_ecc_cmd {
58 u8 word_addr;
59 u8 count;
60 u8 opcode;
61 u8 param1;
62 u16 param2;
63 u8 data[MAX_RSP_SIZE];
64 u8 msecs;
65 u16 rxsize;
66} __packed;
67
68/* Status/Error codes */
69#define STATUS_SIZE 0x04
70#define STATUS_NOERR 0x00
71#define STATUS_WAKE_SUCCESSFUL 0x11
72
73static const struct {
74 u8 value;
75 const char *error_text;
76} error_list[] = {
77 { 0x01, "CheckMac or Verify miscompare" },
78 { 0x03, "Parse Error" },
79 { 0x05, "ECC Fault" },
80 { 0x0F, "Execution Error" },
81 { 0xEE, "Watchdog about to expire" },
82 { 0xFF, "CRC or other communication error" },
83};
84
85/* Definitions for eeprom organization */
86#define CONFIG_ZONE 0
87
88/* Definitions for Indexes common to all commands */
89#define RSP_DATA_IDX 1 /* buffer index of data in response */
90#define DATA_SLOT_2 2 /* used for ECDH private key */
91
92/* Definitions for the device lock state */
93#define DEVICE_LOCK_ADDR 0x15
94#define LOCK_VALUE_IDX (RSP_DATA_IDX + 2)
95#define LOCK_CONFIG_IDX (RSP_DATA_IDX + 3)
96
97/*
98 * Wake High delay to data communication (microseconds). SDA should be stable
99 * high for this entire duration.
100 */
101#define TWHI_MIN 1500
102#define TWHI_MAX 1550
103
104/* Wake Low duration */
105#define TWLO_USEC 60
106
107/* Command execution time (milliseconds) */
108#define MAX_EXEC_TIME_ECDH 58
109#define MAX_EXEC_TIME_GENKEY 115
110#define MAX_EXEC_TIME_READ 1
111
112/* Command opcode */
113#define OPCODE_ECDH 0x43
114#define OPCODE_GENKEY 0x40
115#define OPCODE_READ 0x02
116
117/* Definitions for the READ Command */
118#define READ_COUNT 7
119
120/* Definitions for the GenKey Command */
121#define GENKEY_COUNT 7
122#define GENKEY_MODE_PRIVATE 0x04
123
124/* Definitions for the ECDH Command */
125#define ECDH_COUNT 71
126#define ECDH_PREFIX_MODE 0x00
127
128#endif /* __ATMEL_ECC_H__ */