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7694b6ca64
linux/drivers/crypto/sa2ul.h
Keerthy 7694b6ca64 crypto: sa2ul - Add crypto driver 
Adds a basic crypto driver and currently supports AES/3DES
in cbc mode for both encryption and decryption.

Signed-off-by: Keerthy <j-keerthy@ti.com>
[t-kristo@ti.com: major re-work to fix various bugs in the driver and to
 cleanup the code]
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2020-07-23 17:34:16 +10:00

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/* SPDX-License-Identifier: GPL-2.0 */
/*
* K3 SA2UL crypto accelerator driver
*
* Copyright (C) 2018-2020 Texas Instruments Incorporated - http://www.ti.com
*
* Authors: Keerthy
* Vitaly Andrianov
* Tero Kristo
*/
#ifndef _K3_SA2UL_
#define _K3_SA2UL_
#include <linux/interrupt.h>
#include <linux/skbuff.h>
#include <linux/hw_random.h>
#include <crypto/aes.h>
#define SA_ENGINE_ENABLE_CONTROL 0x1000
struct sa_tfm_ctx;
/*
* SA_ENGINE_ENABLE_CONTROL register bits
*/
#define SA_EEC_ENCSS_EN 0x00000001
#define SA_EEC_AUTHSS_EN 0x00000002
#define SA_EEC_TRNG_EN 0x00000008
#define SA_EEC_PKA_EN 0x00000010
#define SA_EEC_CTXCACH_EN 0x00000080
#define SA_EEC_CPPI_PORT_IN_EN 0x00000200
#define SA_EEC_CPPI_PORT_OUT_EN 0x00000800
/*
* Encoding used to identify the typo of crypto operation
* performed on the packet when the packet is returned
* by SA
*/
#define SA_REQ_SUBTYPE_ENC 0x0001
#define SA_REQ_SUBTYPE_DEC 0x0002
#define SA_REQ_SUBTYPE_SHIFT 16
#define SA_REQ_SUBTYPE_MASK 0xffff
/* Number of 32 bit words in EPIB */
#define SA_DMA_NUM_EPIB_WORDS 4
/* Number of 32 bit words in PS data */
#define SA_DMA_NUM_PS_WORDS 16
#define NKEY_SZ 3
#define MCI_SZ 27
/*
* Maximum number of simultaeneous security contexts
* supported by the driver
*/
#define SA_MAX_NUM_CTX 512
/*
* Assumption: CTX size is multiple of 32
*/
#define SA_CTX_SIZE_TO_DMA_SIZE(ctx_sz) \
((ctx_sz) ? ((ctx_sz) / 32 - 1) : 0)
#define SA_CTX_ENC_KEY_OFFSET 32
#define SA_CTX_ENC_AUX1_OFFSET 64
#define SA_CTX_ENC_AUX2_OFFSET 96
#define SA_CTX_ENC_AUX3_OFFSET 112
#define SA_CTX_ENC_AUX4_OFFSET 128
/* Next Engine Select code in CP_ACE */
#define SA_ENG_ID_EM1 2 /* Enc/Dec engine with AES/DEC core */
#define SA_ENG_ID_EM2 3 /* Encryption/Decryption enginefor pass 2 */
#define SA_ENG_ID_AM1 4 /* Auth. engine with SHA1/MD5/SHA2 core */
#define SA_ENG_ID_AM2 5 /* Authentication engine for pass 2 */
#define SA_ENG_ID_OUTPORT2 20 /* Egress module 2 */
#define SA_ENG_ID_NONE 0xff
/*
* Command Label Definitions
*/
#define SA_CMDL_OFFSET_NESC 0 /* Next Engine Select Code */
#define SA_CMDL_OFFSET_LABEL_LEN 1 /* Engine Command Label Length */
/* 16-bit Length of Data to be processed */
#define SA_CMDL_OFFSET_DATA_LEN 2
#define SA_CMDL_OFFSET_DATA_OFFSET 4 /* Stat Data Offset */
#define SA_CMDL_OFFSET_OPTION_CTRL1 5 /* Option Control Byte 1 */
#define SA_CMDL_OFFSET_OPTION_CTRL2 6 /* Option Control Byte 2 */
#define SA_CMDL_OFFSET_OPTION_CTRL3 7 /* Option Control Byte 3 */
#define SA_CMDL_OFFSET_OPTION_BYTE 8
#define SA_CMDL_HEADER_SIZE_BYTES 8
#define SA_CMDL_OPTION_BYTES_MAX_SIZE 72
#define SA_CMDL_MAX_SIZE_BYTES (SA_CMDL_HEADER_SIZE_BYTES + \
SA_CMDL_OPTION_BYTES_MAX_SIZE)
/* SWINFO word-0 flags */
#define SA_SW_INFO_FLAG_EVICT 0x0001
#define SA_SW_INFO_FLAG_TEAR 0x0002
#define SA_SW_INFO_FLAG_NOPD 0x0004
/*
* This type represents the various packet types to be processed
* by the PHP engine in SA.
* It is used to identify the corresponding PHP processing function.
*/
#define SA_CTX_PE_PKT_TYPE_3GPP_AIR 0 /* 3GPP Air Cipher */
#define SA_CTX_PE_PKT_TYPE_SRTP 1 /* SRTP */
#define SA_CTX_PE_PKT_TYPE_IPSEC_AH 2 /* IPSec Authentication Header */
/* IPSec Encapsulating Security Payload */
#define SA_CTX_PE_PKT_TYPE_IPSEC_ESP 3
/* Indicates that it is in data mode, It may not be used by PHP */
#define SA_CTX_PE_PKT_TYPE_NONE 4
#define SA_CTX_ENC_TYPE1_SZ 64 /* Encryption SC with Key only */
#define SA_CTX_ENC_TYPE2_SZ 96 /* Encryption SC with Key and Aux1 */
#define SA_CTX_AUTH_TYPE1_SZ 64 /* Auth SC with Key only */
#define SA_CTX_AUTH_TYPE2_SZ 96 /* Auth SC with Key and Aux1 */
/* Size of security context for PHP engine */
#define SA_CTX_PHP_PE_CTX_SZ 64
#define SA_CTX_MAX_SZ (64 + SA_CTX_ENC_TYPE2_SZ + SA_CTX_AUTH_TYPE2_SZ)
/*
* Encoding of F/E control in SCCTL
* Bit 0-1: Fetch PHP Bytes
* Bit 2-3: Fetch Encryption/Air Ciphering Bytes
* Bit 4-5: Fetch Authentication Bytes or Encr pass 2
* Bit 6-7: Evict PHP Bytes
*
* where 00 = 0 bytes
* 01 = 64 bytes
* 10 = 96 bytes
* 11 = 128 bytes
*/
#define SA_CTX_DMA_SIZE_0 0
#define SA_CTX_DMA_SIZE_64 1
#define SA_CTX_DMA_SIZE_96 2
#define SA_CTX_DMA_SIZE_128 3
/*
* Byte offset of the owner word in SCCTL
* in the security context
*/
#define SA_CTX_SCCTL_OWNER_OFFSET 0
#define SA_CTX_ENC_KEY_OFFSET 32
#define SA_CTX_ENC_AUX1_OFFSET 64
#define SA_CTX_ENC_AUX2_OFFSET 96
#define SA_CTX_ENC_AUX3_OFFSET 112
#define SA_CTX_ENC_AUX4_OFFSET 128
#define SA_SCCTL_FE_AUTH_ENC 0x65
#define SA_SCCTL_FE_ENC 0x8D
#define SA_ALIGN_MASK (sizeof(u32) - 1)
#define SA_ALIGNED __aligned(32)
/* SA2UL can only handle maximum data size of 64KB */
#define SA_MAX_DATA_SZ U16_MAX
/*
* SA2UL can provide unpredictable results with packet sizes that fall
* the following range, so avoid using it.
*/
#define SA_UNSAFE_DATA_SZ_MIN 240
#define SA_UNSAFE_DATA_SZ_MAX 256
/**
* struct sa_crypto_data - Crypto driver instance data
* @base: Base address of the register space
* @pdev: Platform device pointer
* @sc_pool: security context pool
* @dev: Device pointer
* @scid_lock: secure context ID lock
* @sc_id_start: starting index for SC ID
* @sc_id_end: Ending index for SC ID
* @sc_id: Security Context ID
* @ctx_bm: Bitmap to keep track of Security context ID's
* @ctx: SA tfm context pointer
* @dma_rx1: Pointer to DMA rx channel for sizes < 256 Bytes
* @dma_rx2: Pointer to DMA rx channel for sizes > 256 Bytes
* @dma_tx: Pointer to DMA TX channel
*/
struct sa_crypto_data {
void __iomem *base;
struct platform_device *pdev;
struct dma_pool *sc_pool;
struct device *dev;
spinlock_t scid_lock; /* lock for SC-ID allocation */
/* Security context data */
u16 sc_id_start;
u16 sc_id_end;
u16 sc_id;
unsigned long ctx_bm[DIV_ROUND_UP(SA_MAX_NUM_CTX,
BITS_PER_LONG)];
struct sa_tfm_ctx *ctx;
struct dma_chan *dma_rx1;
struct dma_chan *dma_rx2;
struct dma_chan *dma_tx;
};
/**
* struct sa_cmdl_param_info: Command label parameters info
* @index: Index of the parameter in the command label format
* @offset: the offset of the parameter
* @size: Size of the parameter
*/
struct sa_cmdl_param_info {
u16 index;
u16 offset;
u16 size;
};
/* Maximum length of Auxiliary data in 32bit words */
#define SA_MAX_AUX_DATA_WORDS 8
/**
* struct sa_cmdl_upd_info: Command label updation info
* @flags: flags in command label
* @submode: Encryption submodes
* @enc_size: Size of first pass encryption size
* @enc_size2: Size of second pass encryption size
* @enc_offset: Encryption payload offset in the packet
* @enc_iv: Encryption initialization vector for pass2
* @enc_iv2: Encryption initialization vector for pass2
* @aad: Associated data
* @payload: Payload info
* @auth_size: Authentication size for pass 1
* @auth_size2: Authentication size for pass 2
* @auth_offset: Authentication payload offset
* @auth_iv: Authentication initialization vector
* @aux_key_info: Authentication aux key information
* @aux_key: Aux key for authentication
*/
struct sa_cmdl_upd_info {
u16 flags;
u16 submode;
struct sa_cmdl_param_info enc_size;
struct sa_cmdl_param_info enc_size2;
struct sa_cmdl_param_info enc_offset;
struct sa_cmdl_param_info enc_iv;
struct sa_cmdl_param_info enc_iv2;
struct sa_cmdl_param_info aad;
struct sa_cmdl_param_info payload;
struct sa_cmdl_param_info auth_size;
struct sa_cmdl_param_info auth_size2;
struct sa_cmdl_param_info auth_offset;
struct sa_cmdl_param_info auth_iv;
struct sa_cmdl_param_info aux_key_info;
u32 aux_key[SA_MAX_AUX_DATA_WORDS];
};
/*
* Number of 32bit words appended after the command label
* in PSDATA to identify the crypto request context.
* word-0: Request type
* word-1: pointer to request
*/
#define SA_PSDATA_CTX_WORDS 4
/* Maximum size of Command label in 32 words */
#define SA_MAX_CMDL_WORDS (SA_DMA_NUM_PS_WORDS - SA_PSDATA_CTX_WORDS)
/**
* struct sa_ctx_info: SA context information
* @sc: Pointer to security context
* @sc_phys: Security context physical address that is passed on to SA2UL
* @sc_id: Security context ID
* @cmdl_size: Command label size
* @cmdl: Command label for a particular iteration
* @cmdl_upd_info: structure holding command label updation info
* @epib: Extended protocol information block words
*/
struct sa_ctx_info {
u8 *sc;
dma_addr_t sc_phys;
u16 sc_id;
u16 cmdl_size;
u32 cmdl[SA_MAX_CMDL_WORDS];
struct sa_cmdl_upd_info cmdl_upd_info;
/* Store Auxiliary data such as K2/K3 subkeys in AES-XCBC */
u32 epib[SA_DMA_NUM_EPIB_WORDS];
};
/**
* struct sa_tfm_ctx: TFM context structure
* @dev_data: struct sa_crypto_data pointer
* @enc: struct sa_ctx_info for encryption
* @dec: struct sa_ctx_info for decryption
* @keylen: encrption/decryption keylength
* @iv_idx: Initialization vector index
* @key: encryption key
* @fallback: SW fallback algorithm
*/
struct sa_tfm_ctx {
struct sa_crypto_data *dev_data;
struct sa_ctx_info enc;
struct sa_ctx_info dec;
int keylen;
int iv_idx;
u32 key[AES_KEYSIZE_256 / sizeof(u32)];
/* for fallback */
union {
struct crypto_sync_skcipher *skcipher;
} fallback;
};
enum sa_submode {
SA_MODE_GEN = 0,
SA_MODE_CCM,
SA_MODE_GCM,
SA_MODE_GMAC
};
/* Encryption algorithms */
enum sa_ealg_id {
SA_EALG_ID_NONE = 0, /* No encryption */
SA_EALG_ID_NULL, /* NULL encryption */
SA_EALG_ID_AES_CTR, /* AES Counter mode */
SA_EALG_ID_AES_F8, /* AES F8 mode */
SA_EALG_ID_AES_CBC, /* AES CBC mode */
SA_EALG_ID_DES_CBC, /* DES CBC mode */
SA_EALG_ID_3DES_CBC, /* 3DES CBC mode */
SA_EALG_ID_CCM, /* Counter with CBC-MAC mode */
SA_EALG_ID_GCM, /* Galois Counter mode */
SA_EALG_ID_AES_ECB,
SA_EALG_ID_LAST
};
/* Authentication algorithms */
enum sa_aalg_id {
SA_AALG_ID_NONE = 0, /* No Authentication */
SA_AALG_ID_NULL = SA_EALG_ID_LAST, /* NULL Authentication */
SA_AALG_ID_MD5, /* MD5 mode */
SA_AALG_ID_SHA1, /* SHA1 mode */
SA_AALG_ID_SHA2_224, /* 224-bit SHA2 mode */
SA_AALG_ID_SHA2_256, /* 256-bit SHA2 mode */
SA_AALG_ID_SHA2_512, /* 512-bit SHA2 mode */
SA_AALG_ID_HMAC_MD5, /* HMAC with MD5 mode */
SA_AALG_ID_HMAC_SHA1, /* HMAC with SHA1 mode */
SA_AALG_ID_HMAC_SHA2_224, /* HMAC with 224-bit SHA2 mode */
SA_AALG_ID_HMAC_SHA2_256, /* HMAC with 256-bit SHA2 mode */
SA_AALG_ID_GMAC, /* Galois Message Auth. Code mode */
SA_AALG_ID_CMAC, /* Cipher-based Mes. Auth. Code mode */
SA_AALG_ID_CBC_MAC, /* Cipher Block Chaining */
SA_AALG_ID_AES_XCBC /* AES Extended Cipher Block Chaining */
};
/*
* Mode control engine algorithms used to index the
* mode control instruction tables
*/
enum sa_eng_algo_id {
SA_ENG_ALGO_ECB = 0,
SA_ENG_ALGO_CBC,
SA_ENG_ALGO_CFB,
SA_ENG_ALGO_OFB,
SA_ENG_ALGO_CTR,
SA_ENG_ALGO_F8,
SA_ENG_ALGO_F8F9,
SA_ENG_ALGO_GCM,
SA_ENG_ALGO_GMAC,
SA_ENG_ALGO_CCM,
SA_ENG_ALGO_CMAC,
SA_ENG_ALGO_CBCMAC,
SA_NUM_ENG_ALGOS
};
/**
* struct sa_eng_info: Security accelerator engine info
* @eng_id: Engine ID
* @sc_size: security context size
*/
struct sa_eng_info {
u8 eng_id;
u16 sc_size;
};
#endif /* _K3_SA2UL_ */
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