projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 820684cc | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 11105693 TDA |
2 | /* |
| 3 | * Copyright (c) 2017, Microchip Technology Inc. | |
| 4 | * Author: Tudor Ambarus <tudor.ambarus@microchip.com> | |
| 11105693 TDA |
5 | */ |
| 6 | ||
| 7 | #ifndef __ATMEL_ECC_H__ | |
| 8 | #define __ATMEL_ECC_H__ | |
| 9 | ||
| 10 | #define ATMEL_ECC_PRIORITY 300 | |
| 11 | ||
| 12 | #define COMMAND 0x03 /* packet function */ | |
| 13 | #define SLEEP_TOKEN 0x01 | |
| 14 | #define WAKE_TOKEN_MAX_SIZE 8 | |
| 15 | ||
| 16 | /* Definitions of Data and Command sizes */ | |
| 17 | #define WORD_ADDR_SIZE 1 | |
| 18 | #define COUNT_SIZE 1 | |
| 19 | #define CRC_SIZE 2 | |
| 20 | #define CMD_OVERHEAD_SIZE (COUNT_SIZE + CRC_SIZE) | |
| 21 | ||
| 22 | /* size in bytes of the n prime */ | |
| 23 | #define ATMEL_ECC_NIST_P256_N_SIZE 32 | |
| 24 | #define ATMEL_ECC_PUBKEY_SIZE (2 * ATMEL_ECC_NIST_P256_N_SIZE) | |
| 25 | ||
| 26 | #define STATUS_RSP_SIZE 4 | |
| 27 | #define ECDH_RSP_SIZE (32 + CMD_OVERHEAD_SIZE) | |
| 28 | #define GENKEY_RSP_SIZE (ATMEL_ECC_PUBKEY_SIZE + \ | |
| 29 | CMD_OVERHEAD_SIZE) | |
| 30 | #define READ_RSP_SIZE (4 + CMD_OVERHEAD_SIZE) | |
| 31 | #define MAX_RSP_SIZE GENKEY_RSP_SIZE | |
| 32 | ||
| 33 | /** | |
| 34 | * atmel_ecc_cmd - structure used for communicating with the device. | |
| 35 | * @word_addr: indicates the function of the packet sent to the device. This | |
| 36 | * byte should have a value of COMMAND for normal operation. | |
| 37 | * @count : number of bytes to be transferred to (or from) the device. | |
| 38 | * @opcode : the command code. | |
| 39 | * @param1 : the first parameter; always present. | |
| 40 | * @param2 : the second parameter; always present. | |
| 41 | * @data : optional remaining input data. Includes a 2-byte CRC. | |
| 42 | * @rxsize : size of the data received from i2c client. | |
| 43 | * @msecs : command execution time in milliseconds | |
| 44 | */ | |
| 45 | struct atmel_ecc_cmd { | |
| 46 | u8 word_addr; | |
| 47 | u8 count; | |
| 48 | u8 opcode; | |
| 49 | u8 param1; | |
| 50 | u16 param2; | |
| 51 | u8 data[MAX_RSP_SIZE]; | |
| 52 | u8 msecs; | |
| 53 | u16 rxsize; | |
| 54 | } __packed; | |
| 55 | ||
| 56 | /* Status/Error codes */ | |
| 57 | #define STATUS_SIZE 0x04 | |
| 58 | #define STATUS_NOERR 0x00 | |
| 59 | #define STATUS_WAKE_SUCCESSFUL 0x11 | |
| 60 | ||
| 61 | static const struct { | |
| 62 | u8 value; | |
| 63 | const char *error_text; | |
| 64 | } error_list[] = { | |
| 65 | { 0x01, "CheckMac or Verify miscompare" }, | |
| 66 | { 0x03, "Parse Error" }, | |
| 67 | { 0x05, "ECC Fault" }, | |
| 68 | { 0x0F, "Execution Error" }, | |
| 69 | { 0xEE, "Watchdog about to expire" }, | |
| 70 | { 0xFF, "CRC or other communication error" }, | |
| 71 | }; | |
| 72 | ||
| 73 | /* Definitions for eeprom organization */ | |
| 74 | #define CONFIG_ZONE 0 | |
| 75 | ||
| 76 | /* Definitions for Indexes common to all commands */ | |
| 77 | #define RSP_DATA_IDX 1 /* buffer index of data in response */ | |
| 78 | #define DATA_SLOT_2 2 /* used for ECDH private key */ | |
| 79 | ||
| 80 | /* Definitions for the device lock state */ | |
| 81 | #define DEVICE_LOCK_ADDR 0x15 | |
| 82 | #define LOCK_VALUE_IDX (RSP_DATA_IDX + 2) | |
| 83 | #define LOCK_CONFIG_IDX (RSP_DATA_IDX + 3) | |
| 84 | ||
| 85 | /* | |
| 86 | * Wake High delay to data communication (microseconds). SDA should be stable | |
| 87 | * high for this entire duration. | |
| 88 | */ | |
| 89 | #define TWHI_MIN 1500 | |
| 90 | #define TWHI_MAX 1550 | |
| 91 | ||
| 92 | /* Wake Low duration */ | |
| 93 | #define TWLO_USEC 60 | |
| 94 | ||
| 95 | /* Command execution time (milliseconds) */ | |
| 96 | #define MAX_EXEC_TIME_ECDH 58 | |
| 97 | #define MAX_EXEC_TIME_GENKEY 115 | |
| 98 | #define MAX_EXEC_TIME_READ 1 | |
| 99 | ||
| 100 | /* Command opcode */ | |
| 101 | #define OPCODE_ECDH 0x43 | |
| 102 | #define OPCODE_GENKEY 0x40 | |
| 103 | #define OPCODE_READ 0x02 | |
| 104 | ||
| 105 | /* Definitions for the READ Command */ | |
| 106 | #define READ_COUNT 7 | |
| 107 | ||
| 108 | /* Definitions for the GenKey Command */ | |
| 109 | #define GENKEY_COUNT 7 | |
| 110 | #define GENKEY_MODE_PRIVATE 0x04 | |
| 111 | ||
| 112 | /* Definitions for the ECDH Command */ | |
| 113 | #define ECDH_COUNT 71 | |
| 114 | #define ECDH_PREFIX_MODE 0x00 | |
| 115 | ||
| 116 | #endif /* __ATMEL_ECC_H__ */ |