linux-imx

/*

 * Copyright (C) 2016 Pengutronix, Steffen Trumtrar <kernel@pengutronix.de>

 *

 * The driver is based on information gathered from

 * drivers/mxc/security/mxc_scc.c which can be found in

 * the Freescale linux-2.6-imx.git in the imx_2.6.35_maintain branch.

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * version 2, as published by the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 */

#include <linux/clk.h>

#include <linux/crypto.h>

#include <linux/interrupt.h>

#include <linux/io.h>

#include <linux/irq.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/mutex.h>

#include <linux/of.h>

#include <linux/of_device.h>

#include <linux/platform_device.h>

​

#include <crypto/algapi.h>

#include <crypto/des.h>

​

/* Secure Memory (SCM) registers */

#define SCC_SCM_RED_START       0x0000

#define SCC_SCM_BLACK_START     0x0004

#define SCC_SCM_LENGTH          0x0008

#define SCC_SCM_CTRL            0x000C

#define SCC_SCM_STATUS          0x0010

#define SCC_SCM_ERROR_STATUS        0x0014

#define SCC_SCM_INTR_CTRL       0x0018

#define SCC_SCM_CFG         0x001C

#define SCC_SCM_INIT_VECTOR_0       0x0020

#define SCC_SCM_INIT_VECTOR_1       0x0024

#define SCC_SCM_RED_MEMORY      0x0400

#define SCC_SCM_BLACK_MEMORY        0x0800

​

/* Security Monitor (SMN) Registers */

#define SCC_SMN_STATUS          0x1000

#define SCC_SMN_COMMAND     0x1004

#define SCC_SMN_SEQ_START       0x1008

#define SCC_SMN_SEQ_END     0x100C

#define SCC_SMN_SEQ_CHECK       0x1010

#define SCC_SMN_BIT_COUNT       0x1014

#define SCC_SMN_BITBANK_INC_SIZE    0x1018

#define SCC_SMN_BITBANK_DECREMENT   0x101C

#define SCC_SMN_COMPARE_SIZE        0x1020

#define SCC_SMN_PLAINTEXT_CHECK 0x1024

#define SCC_SMN_CIPHERTEXT_CHECK    0x1028

#define SCC_SMN_TIMER_IV        0x102C

#define SCC_SMN_TIMER_CONTROL       0x1030

#define SCC_SMN_DEBUG_DETECT_STAT   0x1034

#define SCC_SMN_TIMER           0x1038

​

#define SCC_SCM_CTRL_START_CIPHER   BIT(2)

#define SCC_SCM_CTRL_CBC_MODE       BIT(1)

#define SCC_SCM_CTRL_DECRYPT_MODE   BIT(0)

​

#define SCC_SCM_STATUS_LEN_ERR      BIT(12)

#define SCC_SCM_STATUS_SMN_UNBLOCKED    BIT(11)

#define SCC_SCM_STATUS_CIPHERING_DONE   BIT(10)

#define SCC_SCM_STATUS_ZEROIZING_DONE   BIT(9)

#define SCC_SCM_STATUS_INTR_STATUS  BIT(8)

#define SCC_SCM_STATUS_SEC_KEY      BIT(7)

#define SCC_SCM_STATUS_INTERNAL_ERR BIT(6)

#define SCC_SCM_STATUS_BAD_SEC_KEY  BIT(5)

#define SCC_SCM_STATUS_ZEROIZE_FAIL BIT(4)

#define SCC_SCM_STATUS_SMN_BLOCKED  BIT(3)

#define SCC_SCM_STATUS_CIPHERING    BIT(2)

#define SCC_SCM_STATUS_ZEROIZING    BIT(1)

#define SCC_SCM_STATUS_BUSY     BIT(0)

​

#define SCC_SMN_STATUS_STATE_MASK   0x0000001F

#define SCC_SMN_STATE_START     0x0

/* The SMN is zeroizing its RAM during reset */

#define SCC_SMN_STATE_ZEROIZE_RAM   0x5

/* SMN has passed internal checks */

#define SCC_SMN_STATE_HEALTH_CHECK  0x6

/* Fatal Security Violation. SMN is locked, SCM is inoperative. */

#define SCC_SMN_STATE_FAIL      0x9

/* SCC is in secure state. SCM is using secret key. */

#define SCC_SMN_STATE_SECURE        0xA

/* SCC is not secure. SCM is using default key. */