linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 * Microchip / Atmel ECC (I2C) driver.

 *

 * Copyright (c) 2017, Microchip Technology Inc.

 * Author: Tudor Ambarus <tudor.ambarus@microchip.com>

 */

​

#include <linux/bitrev.h>

#include <linux/crc16.h>

#include <linux/delay.h>

#include <linux/device.h>

#include <linux/err.h>

#include <linux/errno.h>

#include <linux/i2c.h>

#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/of_device.h>

#include <linux/scatterlist.h>

#include <linux/slab.h>

#include <linux/workqueue.h>

#include <crypto/internal/kpp.h>

#include <crypto/ecdh.h>

#include <crypto/kpp.h>

#include "atmel-ecc.h"

​

/* Used for binding tfm objects to i2c clients. */

struct atmel_ecc_driver_data {

    struct list_head i2c_client_list;

    spinlock_t i2c_list_lock;

} ____cacheline_aligned;

​

static struct atmel_ecc_driver_data driver_data;

​

/**

 * atmel_ecc_i2c_client_priv - i2c_client private data

 * @client              : pointer to i2c client device

 * @i2c_client_list_node: part of i2c_client_list

 * @lock                : lock for sending i2c commands

 * @wake_token          : wake token array of zeros

 * @wake_token_sz       : size in bytes of the wake_token

 * @tfm_count           : number of active crypto transformations on i2c client

 *

 * Reads and writes from/to the i2c client are sequential. The first byte

 * transmitted to the device is treated as the byte size. Any attempt to send

 * more than this number of bytes will cause the device to not ACK those bytes.

 * After the host writes a single command byte to the input buffer, reads are

 * prohibited until after the device completes command execution. Use a mutex

 * when sending i2c commands.

 */

struct atmel_ecc_i2c_client_priv {

    struct i2c_client *client;

    struct list_head i2c_client_list_node;

    struct mutex lock;

    u8 wake_token[WAKE_TOKEN_MAX_SIZE];

    size_t wake_token_sz;

    atomic_t tfm_count ____cacheline_aligned;

};

​

/**

 * atmel_ecdh_ctx - transformation context

 * @client     : pointer to i2c client device