xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

crypto: atmel-i2c - add support for SHA204A random number generator

Browse Source 
The Linaro/96boards Secure96 mezzanine contains (among other things)
an Atmel SHA204A symmetric crypto processor. This chip implements a
number of different functionalities, but one that is highly useful
for many different 96boards platforms is the random number generator.

So let's implement a driver for the SHA204A, and for the time being,
implement support for the random number generator only.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Ard Biesheuvel
2019-05-24 18:26:49 +02:00
committed by Herbert Xu
parent c34a320176
commit da001fb651
5 changed files with 211 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/crypto/atmel-i2c.h
View File

@@ -7,6 +7,8 @@
#ifndef __ATMEL_I2C_H__
#define __ATMEL_I2C_H__
#include <linux/hw_random.h>
#define ATMEL_ECC_PRIORITY 300
#define COMMAND 0x03 /* packet function */
@@ -28,6 +30,7 @@
#define GENKEY_RSP_SIZE (ATMEL_ECC_PUBKEY_SIZE + \
CMD_OVERHEAD_SIZE)
#define READ_RSP_SIZE (4 + CMD_OVERHEAD_SIZE)
#define RANDOM_RSP_SIZE (32 + CMD_OVERHEAD_SIZE)
#define MAX_RSP_SIZE GENKEY_RSP_SIZE
/**
@@ -96,15 +99,20 @@ static const struct {
#define MAX_EXEC_TIME_ECDH 58
#define MAX_EXEC_TIME_GENKEY 115
#define MAX_EXEC_TIME_READ 1
#define MAX_EXEC_TIME_RANDOM 50
/* Command opcode */
#define OPCODE_ECDH 0x43
#define OPCODE_GENKEY 0x40
#define OPCODE_READ 0x02
#define OPCODE_RANDOM 0x1b
/* Definitions for the READ Command */
#define READ_COUNT 7
/* Definitions for the RANDOM Command */
#define RANDOM_COUNT 7
/* Definitions for the GenKey Command */
#define GENKEY_COUNT 7
#define GENKEY_MODE_PRIVATE 0x04
@@ -142,6 +150,7 @@ struct atmel_i2c_client_priv {
u8 wake_token[WAKE_TOKEN_MAX_SIZE];
size_t wake_token_sz;
atomic_t tfm_count ____cacheline_aligned;
struct hwrng hwrng;
};
/**
@@ -179,6 +188,7 @@ void atmel_i2c_enqueue(struct atmel_i2c_work_data *work_data,
int atmel_i2c_send_receive(struct i2c_client *client, struct atmel_i2c_cmd *cmd);
void atmel_i2c_init_read_cmd(struct atmel_i2c_cmd *cmd);
void atmel_i2c_init_random_cmd(struct atmel_i2c_cmd *cmd);
void atmel_i2c_init_genkey_cmd(struct atmel_i2c_cmd *cmd, u16 keyid);
int atmel_i2c_init_ecdh_cmd(struct atmel_i2c_cmd *cmd,
struct scatterlist *pubkey);