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sa2ul.c
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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
*/
#include <linux/bitfield.h>
#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/dmaengine.h>
#include <linux/dmapool.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <crypto/aes.h>
#include <crypto/authenc.h>
#include <crypto/des.h>
#include <crypto/internal/aead.h>
#include <crypto/internal/hash.h>
#include <crypto/internal/skcipher.h>
#include <crypto/scatterwalk.h>
#include <crypto/sha1.h>
#include <crypto/sha2.h>
#include "sa2ul.h"
/* Byte offset for key in encryption security context */
#define SC_ENC_KEY_OFFSET (1 + 27 + 4)
/* Byte offset for Aux-1 in encryption security context */
#define SC_ENC_AUX1_OFFSET (1 + 27 + 4 + 32)
#define SA_CMDL_UPD_ENC 0x0001
#define SA_CMDL_UPD_AUTH 0x0002
#define SA_CMDL_UPD_ENC_IV 0x0004
#define SA_CMDL_UPD_AUTH_IV 0x0008
#define SA_CMDL_UPD_AUX_KEY 0x0010
#define SA_AUTH_SUBKEY_LEN 16
#define SA_CMDL_PAYLOAD_LENGTH_MASK 0xFFFF
#define SA_CMDL_SOP_BYPASS_LEN_MASK 0xFF000000
#define MODE_CONTROL_BYTES 27
#define SA_HASH_PROCESSING 0
#define SA_CRYPTO_PROCESSING 0
#define SA_UPLOAD_HASH_TO_TLR BIT(6)
#define SA_SW0_FLAGS_MASK 0xF0000
#define SA_SW0_CMDL_INFO_MASK 0x1F00000
#define SA_SW0_CMDL_PRESENT BIT(4)
#define SA_SW0_ENG_ID_MASK 0x3E000000
#define SA_SW0_DEST_INFO_PRESENT BIT(30)
#define SA_SW2_EGRESS_LENGTH 0xFF000000
#define SA_BASIC_HASH 0x10
#define SHA256_DIGEST_WORDS 8
/* Make 32-bit word from 4 bytes */
#define SA_MK_U32(b0, b1, b2, b3) (((b0) << 24) | ((b1) << 16) | \
((b2) << 8) | (b3))
/* size of SCCTL structure in bytes */
#define SA_SCCTL_SZ 16
/* Max Authentication tag size */
#define SA_MAX_AUTH_TAG_SZ 64
enum sa_algo_id {
SA_ALG_CBC_AES = 0,
SA_ALG_EBC_AES,
SA_ALG_CBC_DES3,
SA_ALG_ECB_DES3,
SA_ALG_SHA1,
SA_ALG_SHA256,
SA_ALG_SHA512,
SA_ALG_AUTHENC_SHA1_AES,
SA_ALG_AUTHENC_SHA256_AES,
};
struct sa_match_data {
u8 priv;
u8 priv_id;
u32 supported_algos;
};
static struct device *sa_k3_dev;
/**
* struct sa_cmdl_cfg - Command label configuration descriptor
* @aalg: authentication algorithm ID
* @enc_eng_id: Encryption Engine ID supported by the SA hardware
* @auth_eng_id: Authentication Engine ID
* @iv_size: Initialization Vector size
* @akey: Authentication key
* @akey_len: Authentication key length
* @enc: True, if this is an encode request
*/
struct sa_cmdl_cfg {
int aalg;
u8 enc_eng_id;
u8 auth_eng_id;
u8 iv_size;
const u8 *akey;
u16 akey_len;
bool enc;
};
/**
* struct algo_data - Crypto algorithm specific data
* @enc_eng: Encryption engine info structure
* @auth_eng: Authentication engine info structure
* @auth_ctrl: Authentication control word
* @hash_size: Size of digest
* @iv_idx: iv index in psdata
* @iv_out_size: iv out size
* @ealg_id: Encryption Algorithm ID
* @aalg_id: Authentication algorithm ID
* @mci_enc: Mode Control Instruction for Encryption algorithm
* @mci_dec: Mode Control Instruction for Decryption
* @inv_key: Whether the encryption algorithm demands key inversion
* @ctx: Pointer to the algorithm context
* @keyed_mac: Whether the authentication algorithm has key
* @prep_iopad: Function pointer to generate intermediate ipad/opad
*/
struct algo_data {
struct sa_eng_info enc_eng;
struct sa_eng_info auth_eng;
u8 auth_ctrl;
u8 hash_size;
u8 iv_idx;
u8 iv_out_size;
u8 ealg_id;
u8 aalg_id;
u8 *mci_enc;
u8 *mci_dec;
bool inv_key;
struct sa_tfm_ctx *ctx;
bool keyed_mac;
void (*prep_iopad)(struct algo_data *algo, const u8 *key,
u16 key_sz, __be32 *ipad, __be32 *opad);
};
/**
* struct sa_alg_tmpl: A generic template encompassing crypto/aead algorithms
* @type: Type of the crypto algorithm.
* @alg: Union of crypto algorithm definitions.
* @registered: Flag indicating if the crypto algorithm is already registered
*/
struct sa_alg_tmpl {
u32 type; /* CRYPTO_ALG_TYPE from <linux/crypto.h> */
union {
struct skcipher_alg skcipher;
struct ahash_alg ahash;
struct aead_alg aead;
} alg;
bool registered;
};
/**
* struct sa_mapped_sg: scatterlist information for tx and rx
* @mapped: Set to true if the @sgt is mapped
* @dir: mapping direction used for @sgt
* @split_sg: Set if the sg is split and needs to be freed up
* @static_sg: Static scatterlist entry for overriding data
* @sgt: scatterlist table for DMA API use
*/
struct sa_mapped_sg {
bool mapped;
enum dma_data_direction dir;
struct scatterlist static_sg;
struct scatterlist *split_sg;
struct sg_table sgt;
};
/**
* struct sa_rx_data: RX Packet miscellaneous data place holder
* @req: crypto request data pointer
* @ddev: pointer to the DMA device
* @tx_in: dma_async_tx_descriptor pointer for rx channel
* @mapped_sg: Information on tx (0) and rx (1) scatterlist DMA mapping
* @enc: Flag indicating either encryption or decryption
* @enc_iv_size: Initialisation vector size
* @iv_idx: Initialisation vector index
*/
struct sa_rx_data {
void *req;
struct device *ddev;
struct dma_async_tx_descriptor *tx_in;
struct sa_mapped_sg mapped_sg[2];
u8 enc;
u8 enc_iv_size;
u8 iv_idx;
};
/**
* struct sa_req: SA request definition
* @dev: device for the request
* @size: total data to the xmitted via DMA
* @enc_offset: offset of cipher data
* @enc_size: data to be passed to cipher engine
* @enc_iv: cipher IV
* @auth_offset: offset of the authentication data
* @auth_size: size of the authentication data
* @auth_iv: authentication IV
* @type: algorithm type for the request
* @cmdl: command label pointer
* @base: pointer to the base request
* @ctx: pointer to the algorithm context data
* @enc: true if this is an encode request
* @src: source data
* @dst: destination data
* @callback: DMA callback for the request
* @mdata_size: metadata size passed to DMA
*/
struct sa_req {
struct device *dev;
u16 size;
u8 enc_offset;
u16 enc_size;
u8 *enc_iv;
u8 auth_offset;
u16 auth_size;
u8 *auth_iv;
u32 type;
u32 *cmdl;
struct crypto_async_request *base;
struct sa_tfm_ctx *ctx;
bool enc;
struct scatterlist *src;
struct scatterlist *dst;
dma_async_tx_callback callback;
u16 mdata_size;
};
/*
* Mode Control Instructions for various Key lengths 128, 192, 256
* For CBC (Cipher Block Chaining) mode for encryption
*/
static u8 mci_cbc_enc_array[3][MODE_CONTROL_BYTES] = {
{ 0x61, 0x00, 0x00, 0x18, 0x88, 0x0a, 0xaa, 0x4b, 0x7e, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
{ 0x61, 0x00, 0x00, 0x18, 0x88, 0x4a, 0xaa, 0x4b, 0x7e, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
{ 0x61, 0x00, 0x00, 0x18, 0x88, 0x8a, 0xaa, 0x4b, 0x7e, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
};
/*
* Mode Control Instructions for various Key lengths 128, 192, 256
* For CBC (Cipher Block Chaining) mode for decryption
*/
static u8 mci_cbc_dec_array[3][MODE_CONTROL_BYTES] = {
{ 0x71, 0x00, 0x00, 0x80, 0x8a, 0xca, 0x98, 0xf4, 0x40, 0xc0,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
{ 0x71, 0x00, 0x00, 0x84, 0x8a, 0xca, 0x98, 0xf4, 0x40, 0xc0,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
{ 0x71, 0x00, 0x00, 0x88, 0x8a, 0xca, 0x98, 0xf4, 0x40, 0xc0,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
};
/*
* Mode Control Instructions for various Key lengths 128, 192, 256
* For CBC (Cipher Block Chaining) mode for encryption
*/
static u8 mci_cbc_enc_no_iv_array[3][MODE_CONTROL_BYTES] = {
{ 0x21, 0x00, 0x00, 0x18, 0x88, 0x0a, 0xaa, 0x4b, 0x7e, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
{ 0x21, 0x00, 0x00, 0x18, 0x88, 0x4a, 0xaa, 0x4b, 0x7e, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
{ 0x21, 0x00, 0x00, 0x18, 0x88, 0x8a, 0xaa, 0x4b, 0x7e, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
};
/*
* Mode Control Instructions for various Key lengths 128, 192, 256
* For CBC (Cipher Block Chaining) mode for decryption
*/
static u8 mci_cbc_dec_no_iv_array[3][MODE_CONTROL_BYTES] = {
{ 0x31, 0x00, 0x00, 0x80, 0x8a, 0xca, 0x98, 0xf4, 0x40, 0xc0,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
{ 0x31, 0x00, 0x00, 0x84, 0x8a, 0xca, 0x98, 0xf4, 0x40, 0xc0,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
{ 0x31, 0x00, 0x00, 0x88, 0x8a, 0xca, 0x98, 0xf4, 0x40, 0xc0,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
};
/*
* Mode Control Instructions for various Key lengths 128, 192, 256
* For ECB (Electronic Code Book) mode for encryption
*/
static u8 mci_ecb_enc_array[3][27] = {
{ 0x21, 0x00, 0x00, 0x80, 0x8a, 0x04, 0xb7, 0x90, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
{ 0x21, 0x00, 0x00, 0x84, 0x8a, 0x04, 0xb7, 0x90, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
{ 0x21, 0x00, 0x00, 0x88, 0x8a, 0x04, 0xb7, 0x90, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
};
/*
* Mode Control Instructions for various Key lengths 128, 192, 256
* For ECB (Electronic Code Book) mode for decryption
*/
static u8 mci_ecb_dec_array[3][27] = {
{ 0x31, 0x00, 0x00, 0x80, 0x8a, 0x04, 0xb7, 0x90, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
{ 0x31, 0x00, 0x00, 0x84, 0x8a, 0x04, 0xb7, 0x90, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
{ 0x31, 0x00, 0x00, 0x88, 0x8a, 0x04, 0xb7, 0x90, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
};
/*
* Mode Control Instructions for DES algorithm
* For CBC (Cipher Block Chaining) mode and ECB mode
* encryption and for decryption respectively
*/
static u8 mci_cbc_3des_enc_array[MODE_CONTROL_BYTES] = {
0x60, 0x00, 0x00, 0x18, 0x88, 0x52, 0xaa, 0x4b, 0x7e, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00,
};
static u8 mci_cbc_3des_dec_array[MODE_CONTROL_BYTES] = {
0x70, 0x00, 0x00, 0x85, 0x0a, 0xca, 0x98, 0xf4, 0x40, 0xc0, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00,
};
static u8 mci_ecb_3des_enc_array[MODE_CONTROL_BYTES] = {
0x20, 0x00, 0x00, 0x85, 0x0a, 0x04, 0xb7, 0x90, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00,
};
static u8 mci_ecb_3des_dec_array[MODE_CONTROL_BYTES] = {
0x30, 0x00, 0x00, 0x85, 0x0a, 0x04, 0xb7, 0x90, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00,
};
/*
* Perform 16 byte or 128 bit swizzling
* The SA2UL Expects the security context to
* be in little Endian and the bus width is 128 bits or 16 bytes
* Hence swap 16 bytes at a time from higher to lower address
*/
static void sa_swiz_128(u8 *in, u16 len)
{
u8 data[16];
int i, j;
for (i = 0; i < len; i += 16) {
memcpy(data, &in[i], 16);
for (j = 0; j < 16; j++)
in[i + j] = data[15 - j];
}
}
/* Prepare the ipad and opad from key as per SHA algorithm step 1*/
static void prepare_kipad(u8 *k_ipad, const u8 *key, u16 key_sz)
{
int i;
for (i = 0; i < key_sz; i++)
k_ipad[i] = key[i] ^ 0x36;
/* Instead of XOR with 0 */
for (; i < SHA1_BLOCK_SIZE; i++)
k_ipad[i] = 0x36;
}
static void prepare_kopad(u8 *k_opad, const u8 *key, u16 key_sz)
{
int i;
for (i = 0; i < key_sz; i++)
k_opad[i] = key[i] ^ 0x5c;
/* Instead of XOR with 0 */
for (; i < SHA1_BLOCK_SIZE; i++)
k_opad[i] = 0x5c;
}
static void sa_export_shash(void *state, struct shash_desc *hash,
int digest_size, __be32 *out)
{
struct sha1_state *sha1;
struct sha256_state *sha256;
u32 *result;
switch (digest_size) {
case SHA1_DIGEST_SIZE:
sha1 = state;
result = sha1->state;
break;
case SHA256_DIGEST_SIZE:
sha256 = state;
result = sha256->state;
break;
default:
dev_err(sa_k3_dev, "%s: bad digest_size=%d\n", __func__,
digest_size);
return;
}
crypto_shash_export(hash, state);
cpu_to_be32_array(out, result, digest_size / 4);
}
static void sa_prepare_iopads(struct algo_data *data, const u8 *key,
u16 key_sz, __be32 *ipad, __be32 *opad)
{
SHASH_DESC_ON_STACK(shash, data->ctx->shash);
int block_size = crypto_shash_blocksize(data->ctx->shash);
int digest_size = crypto_shash_digestsize(data->ctx->shash);
union {
struct sha1_state sha1;
struct sha256_state sha256;
u8 k_pad[SHA1_BLOCK_SIZE];
} sha;
shash->tfm = data->ctx->shash;
prepare_kipad(sha.k_pad, key, key_sz);
crypto_shash_init(shash);
crypto_shash_update(shash, sha.k_pad, block_size);
sa_export_shash(&sha, shash, digest_size, ipad);
prepare_kopad(sha.k_pad, key, key_sz);
crypto_shash_init(shash);
crypto_shash_update(shash, sha.k_pad, block_size);
sa_export_shash(&sha, shash, digest_size, opad);
memzero_explicit(&sha, sizeof(sha));
}
/* Derive the inverse key used in AES-CBC decryption operation */
static inline int sa_aes_inv_key(u8 *inv_key, const u8 *key, u16 key_sz)
{
struct crypto_aes_ctx ctx;
int key_pos;
if (aes_expandkey(&ctx, key, key_sz)) {
dev_err(sa_k3_dev, "%s: bad key len(%d)\n", __func__, key_sz);
return -EINVAL;
}
/* work around to get the right inverse for AES_KEYSIZE_192 size keys */
if (key_sz == AES_KEYSIZE_192) {
ctx.key_enc[52] = ctx.key_enc[51] ^ ctx.key_enc[46];
ctx.key_enc[53] = ctx.key_enc[52] ^ ctx.key_enc[47];
}
/* Based crypto_aes_expand_key logic */
switch (key_sz) {
case AES_KEYSIZE_128:
case AES_KEYSIZE_192:
key_pos = key_sz + 24;
break;
case AES_KEYSIZE_256:
key_pos = key_sz + 24 - 4;
break;
default:
dev_err(sa_k3_dev, "%s: bad key len(%d)\n", __func__, key_sz);
return -EINVAL;
}
memcpy(inv_key, &ctx.key_enc[key_pos], key_sz);
return 0;
}
/* Set Security context for the encryption engine */
static int sa_set_sc_enc(struct algo_data *ad, const u8 *key, u16 key_sz,
u8 enc, u8 *sc_buf)
{
const u8 *mci = NULL;
/* Set Encryption mode selector to crypto processing */
sc_buf[0] = SA_CRYPTO_PROCESSING;
if (enc)
mci = ad->mci_enc;
else
mci = ad->mci_dec;
/* Set the mode control instructions in security context */
if (mci)
memcpy(&sc_buf[1], mci, MODE_CONTROL_BYTES);
/* For AES-CBC decryption get the inverse key */
if (ad->inv_key && !enc) {
if (sa_aes_inv_key(&sc_buf[SC_ENC_KEY_OFFSET], key, key_sz))
return -EINVAL;
/* For all other cases: key is used */
} else {
memcpy(&sc_buf[SC_ENC_KEY_OFFSET], key, key_sz);
}
return 0;
}
/* Set Security context for the authentication engine */
static void sa_set_sc_auth(struct algo_data *ad, const u8 *key, u16 key_sz,
u8 *sc_buf)
{
__be32 *ipad = (void *)(sc_buf + 32);
__be32 *opad = (void *)(sc_buf + 64);
/* Set Authentication mode selector to hash processing */
sc_buf[0] = SA_HASH_PROCESSING;
/* Auth SW ctrl word: bit[6]=1 (upload computed hash to TLR section) */
sc_buf[1] = SA_UPLOAD_HASH_TO_TLR;
sc_buf[1] |= ad->auth_ctrl;
/* Copy the keys or ipad/opad */
if (ad->keyed_mac)
ad->prep_iopad(ad, key, key_sz, ipad, opad);
else {
/* basic hash */
sc_buf[1] |= SA_BASIC_HASH;
}
}
static inline void sa_copy_iv(__be32 *out, const u8 *iv, bool size16)
{
int j;
for (j = 0; j < ((size16) ? 4 : 2); j++) {
*out = cpu_to_be32(*((u32 *)iv));
iv += 4;
out++;
}
}
/* Format general command label */
static int sa_format_cmdl_gen(struct sa_cmdl_cfg *cfg, u8 *cmdl,
struct sa_cmdl_upd_info *upd_info)
{
u8 enc_offset = 0, auth_offset = 0, total = 0;
u8 enc_next_eng = SA_ENG_ID_OUTPORT2;
u8 auth_next_eng = SA_ENG_ID_OUTPORT2;
u32 *word_ptr = (u32 *)cmdl;
int i;
/* Clear the command label */
memzero_explicit(cmdl, (SA_MAX_CMDL_WORDS * sizeof(u32)));
/* Iniialize the command update structure */
memzero_explicit(upd_info, sizeof(*upd_info));
if (cfg->enc_eng_id && cfg->auth_eng_id) {
if (cfg->enc) {
auth_offset = SA_CMDL_HEADER_SIZE_BYTES;
enc_next_eng = cfg->auth_eng_id;
if (cfg->iv_size)
auth_offset += cfg->iv_size;
} else {
enc_offset = SA_CMDL_HEADER_SIZE_BYTES;
auth_next_eng = cfg->enc_eng_id;
}
}
if (cfg->enc_eng_id) {
upd_info->flags |= SA_CMDL_UPD_ENC;
upd_info->enc_size.index = enc_offset >> 2;
upd_info->enc_offset.index = upd_info->enc_size.index + 1;
/* Encryption command label */
cmdl[enc_offset + SA_CMDL_OFFSET_NESC] = enc_next_eng;
/* Encryption modes requiring IV */
if (cfg->iv_size) {
upd_info->flags |= SA_CMDL_UPD_ENC_IV;
upd_info->enc_iv.index =
(enc_offset + SA_CMDL_HEADER_SIZE_BYTES) >> 2;
upd_info->enc_iv.size = cfg->iv_size;
cmdl[enc_offset + SA_CMDL_OFFSET_LABEL_LEN] =
SA_CMDL_HEADER_SIZE_BYTES + cfg->iv_size;
cmdl[enc_offset + SA_CMDL_OFFSET_OPTION_CTRL1] =
(SA_CTX_ENC_AUX2_OFFSET | (cfg->iv_size >> 3));
total += SA_CMDL_HEADER_SIZE_BYTES + cfg->iv_size;
} else {
cmdl[enc_offset + SA_CMDL_OFFSET_LABEL_LEN] =
SA_CMDL_HEADER_SIZE_BYTES;
total += SA_CMDL_HEADER_SIZE_BYTES;
}
}
if (cfg->auth_eng_id) {
upd_info->flags |= SA_CMDL_UPD_AUTH;
upd_info->auth_size.index = auth_offset >> 2;
upd_info->auth_offset.index = upd_info->auth_size.index + 1;
cmdl[auth_offset + SA_CMDL_OFFSET_NESC] = auth_next_eng;
cmdl[auth_offset + SA_CMDL_OFFSET_LABEL_LEN] =
SA_CMDL_HEADER_SIZE_BYTES;
total += SA_CMDL_HEADER_SIZE_BYTES;
}
total = roundup(total, 8);
for (i = 0; i < total / 4; i++)
word_ptr[i] = swab32(word_ptr[i]);
return total;
}
/* Update Command label */
static inline void sa_update_cmdl(struct sa_req *req, u32 *cmdl,
struct sa_cmdl_upd_info *upd_info)
{
int i = 0, j;
if (likely(upd_info->flags & SA_CMDL_UPD_ENC)) {
cmdl[upd_info->enc_size.index] &= ~SA_CMDL_PAYLOAD_LENGTH_MASK;
cmdl[upd_info->enc_size.index] |= req->enc_size;
cmdl[upd_info->enc_offset.index] &=
~SA_CMDL_SOP_BYPASS_LEN_MASK;
cmdl[upd_info->enc_offset.index] |=
FIELD_PREP(SA_CMDL_SOP_BYPASS_LEN_MASK,
req->enc_offset);
if (likely(upd_info->flags & SA_CMDL_UPD_ENC_IV)) {
__be32 *data = (__be32 *)&cmdl[upd_info->enc_iv.index];
u32 *enc_iv = (u32 *)req->enc_iv;
for (j = 0; i < upd_info->enc_iv.size; i += 4, j++) {
data[j] = cpu_to_be32(*enc_iv);
enc_iv++;
}
}
}
if (likely(upd_info->flags & SA_CMDL_UPD_AUTH)) {
cmdl[upd_info->auth_size.index] &= ~SA_CMDL_PAYLOAD_LENGTH_MASK;
cmdl[upd_info->auth_size.index] |= req->auth_size;
cmdl[upd_info->auth_offset.index] &=
~SA_CMDL_SOP_BYPASS_LEN_MASK;
cmdl[upd_info->auth_offset.index] |=
FIELD_PREP(SA_CMDL_SOP_BYPASS_LEN_MASK,
req->auth_offset);
if (upd_info->flags & SA_CMDL_UPD_AUTH_IV) {
sa_copy_iv((void *)&cmdl[upd_info->auth_iv.index],
req->auth_iv,
(upd_info->auth_iv.size > 8));
}
if (upd_info->flags & SA_CMDL_UPD_AUX_KEY) {
int offset = (req->auth_size & 0xF) ? 4 : 0;
memcpy(&cmdl[upd_info->aux_key_info.index],
&upd_info->aux_key[offset], 16);
}
}
}
/* Format SWINFO words to be sent to SA */
static
void sa_set_swinfo(u8 eng_id, u16 sc_id, dma_addr_t sc_phys,
u8 cmdl_present, u8 cmdl_offset, u8 flags,
u8 hash_size, u32 *swinfo)
{
swinfo[0] = sc_id;
swinfo[0] |= FIELD_PREP(SA_SW0_FLAGS_MASK, flags);
if (likely(cmdl_present))
swinfo[0] |= FIELD_PREP(SA_SW0_CMDL_INFO_MASK,
cmdl_offset | SA_SW0_CMDL_PRESENT);
swinfo[0] |= FIELD_PREP(SA_SW0_ENG_ID_MASK, eng_id);
swinfo[0] |= SA_SW0_DEST_INFO_PRESENT;
swinfo[1] = (u32)(sc_phys & 0xFFFFFFFFULL);
swinfo[2] = (u32)((sc_phys & 0xFFFFFFFF00000000ULL) >> 32);
swinfo[2] |= FIELD_PREP(SA_SW2_EGRESS_LENGTH, hash_size);
}
/* Dump the security context */
static void sa_dump_sc(u8 *buf, dma_addr_t dma_addr)
{
#ifdef DEBUG
dev_info(sa_k3_dev, "Security context dump:: 0x%pad\n", &dma_addr);
print_hex_dump(KERN_CONT, "", DUMP_PREFIX_OFFSET,
16, 1, buf, SA_CTX_MAX_SZ, false);
#endif
}
static
int sa_init_sc(struct sa_ctx_info *ctx, const struct sa_match_data *match_data,
const u8 *enc_key, u16 enc_key_sz,
const u8 *auth_key, u16 auth_key_sz,
struct algo_data *ad, u8 enc, u32 *swinfo)
{
int enc_sc_offset = 0;
int auth_sc_offset = 0;
u8 *sc_buf = ctx->sc;
u16 sc_id = ctx->sc_id;
u8 first_engine = 0;
memzero_explicit(sc_buf, SA_CTX_MAX_SZ);
if (ad->auth_eng.eng_id) {
if (enc)
first_engine = ad->enc_eng.eng_id;
else
first_engine = ad->auth_eng.eng_id;
enc_sc_offset = SA_CTX_PHP_PE_CTX_SZ;
auth_sc_offset = enc_sc_offset + ad->enc_eng.sc_size;
sc_buf[1] = SA_SCCTL_FE_AUTH_ENC;
if (!ad->hash_size)
return -EINVAL;
ad->hash_size = roundup(ad->hash_size, 8);
} else if (ad->enc_eng.eng_id && !ad->auth_eng.eng_id) {
enc_sc_offset = SA_CTX_PHP_PE_CTX_SZ;
first_engine = ad->enc_eng.eng_id;
sc_buf[1] = SA_SCCTL_FE_ENC;
ad->hash_size = ad->iv_out_size;
}
/* SCCTL Owner info: 0=host, 1=CP_ACE */
sc_buf[SA_CTX_SCCTL_OWNER_OFFSET] = 0;
memcpy(&sc_buf[2], &sc_id, 2);
sc_buf[4] = 0x0;
sc_buf[5] = match_data->priv_id;
sc_buf[6] = match_data->priv;
sc_buf[7] = 0x0;
/* Prepare context for encryption engine */
if (ad->enc_eng.sc_size) {
if (sa_set_sc_enc(ad, enc_key, enc_key_sz, enc,
&sc_buf[enc_sc_offset]))
return -EINVAL;
}
/* Prepare context for authentication engine */
if (ad->auth_eng.sc_size)
sa_set_sc_auth(ad, auth_key, auth_key_sz,
&sc_buf[auth_sc_offset]);
/* Set the ownership of context to CP_ACE */
sc_buf[SA_CTX_SCCTL_OWNER_OFFSET] = 0x80;
/* swizzle the security context */
sa_swiz_128(sc_buf, SA_CTX_MAX_SZ);
sa_set_swinfo(first_engine, ctx->sc_id, ctx->sc_phys, 1, 0,
SA_SW_INFO_FLAG_EVICT, ad->hash_size, swinfo);
sa_dump_sc(sc_buf, ctx->sc_phys);
return 0;
}
/* Free the per direction context memory */
static void sa_free_ctx_info(struct sa_ctx_info *ctx,
struct sa_crypto_data *data)
{
unsigned long bn;
bn = ctx->sc_id - data->sc_id_start;
spin_lock(&data->scid_lock);
__clear_bit(bn, data->ctx_bm);
data->sc_id--;
spin_unlock(&data->scid_lock);
if (ctx->sc) {
dma_pool_free(data->sc_pool, ctx->sc, ctx->sc_phys);
ctx->sc = NULL;
}
}
static int sa_init_ctx_info(struct sa_ctx_info *ctx,
struct sa_crypto_data *data)
{
unsigned long bn;
int err;
spin_lock(&data->scid_lock);
bn = find_first_zero_bit(data->ctx_bm, SA_MAX_NUM_CTX);
__set_bit(bn, data->ctx_bm);
data->sc_id++;
spin_unlock(&data->scid_lock);
ctx->sc_id = (u16)(data->sc_id_start + bn);
ctx->sc = dma_pool_alloc(data->sc_pool, GFP_KERNEL, &ctx->sc_phys);
if (!ctx->sc) {
dev_err(&data->pdev->dev, "Failed to allocate SC memory\n");
err = -ENOMEM;
goto scid_rollback;
}
return 0;
scid_rollback:
spin_lock(&data->scid_lock);
__clear_bit(bn, data->ctx_bm);
data->sc_id--;
spin_unlock(&data->scid_lock);
return err;
}
static void sa_cipher_cra_exit(struct crypto_skcipher *tfm)
{
struct sa_tfm_ctx *ctx = crypto_skcipher_ctx(tfm);
struct sa_crypto_data *data = dev_get_drvdata(sa_k3_dev);
dev_dbg(sa_k3_dev, "%s(0x%p) sc-ids(0x%x(0x%pad), 0x%x(0x%pad))\n",
__func__, tfm, ctx->enc.sc_id, &ctx->enc.sc_phys,
ctx->dec.sc_id, &ctx->dec.sc_phys);
sa_free_ctx_info(&ctx->enc, data);
sa_free_ctx_info(&ctx->dec, data);
crypto_free_skcipher(ctx->fallback.skcipher);
}
static int sa_cipher_cra_init(struct crypto_skcipher *tfm)
{
struct sa_tfm_ctx *ctx = crypto_skcipher_ctx(tfm);
struct sa_crypto_data *data = dev_get_drvdata(sa_k3_dev);
const char *name = crypto_tfm_alg_name(&tfm->base);
struct crypto_skcipher *child;
int ret;
memzero_explicit(ctx, sizeof(*ctx));
ctx->dev_data = data;
ret = sa_init_ctx_info(&ctx->enc, data);
if (ret)
return ret;
ret = sa_init_ctx_info(&ctx->dec, data);
if (ret) {
sa_free_ctx_info(&ctx->enc, data);
return ret;
}
child = crypto_alloc_skcipher(name, 0, CRYPTO_ALG_NEED_FALLBACK);
if (IS_ERR(child)) {
dev_err(sa_k3_dev, "Error allocating fallback algo %s\n", name);
return PTR_ERR(child);
}
ctx->fallback.skcipher = child;
crypto_skcipher_set_reqsize(tfm, crypto_skcipher_reqsize(child) +
sizeof(struct skcipher_request));
dev_dbg(sa_k3_dev, "%s(0x%p) sc-ids(0x%x(0x%pad), 0x%x(0x%pad))\n",
__func__, tfm, ctx->enc.sc_id, &ctx->enc.sc_phys,
ctx->dec.sc_id, &ctx->dec.sc_phys);
return 0;
}
static int sa_cipher_setkey(struct crypto_skcipher *tfm, const u8 *key,
unsigned int keylen, struct algo_data *ad)
{
struct sa_tfm_ctx *ctx = crypto_skcipher_ctx(tfm);
struct crypto_skcipher *child = ctx->fallback.skcipher;
int cmdl_len;
struct sa_cmdl_cfg cfg;
int ret;
if (keylen != AES_KEYSIZE_128 && keylen != AES_KEYSIZE_192 &&
keylen != AES_KEYSIZE_256)
return -EINVAL;
ad->enc_eng.eng_id = SA_ENG_ID_EM1;
ad->enc_eng.sc_size = SA_CTX_ENC_TYPE1_SZ;
memzero_explicit(&cfg, sizeof(cfg));
cfg.enc_eng_id = ad->enc_eng.eng_id;
cfg.iv_size = crypto_skcipher_ivsize(tfm);
crypto_skcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
crypto_skcipher_set_flags(child, tfm->base.crt_flags &
CRYPTO_TFM_REQ_MASK);
ret = crypto_skcipher_setkey(child, key, keylen);
if (ret)
return ret;
/* Setup Encryption Security Context & Command label template */
if (sa_init_sc(&ctx->enc, ctx->dev_data->match_data, key, keylen, NULL, 0,
ad, 1, &ctx->enc.epib[1]))
goto badkey;
cmdl_len = sa_format_cmdl_gen(&cfg,
(u8 *)ctx->enc.cmdl,
&ctx->enc.cmdl_upd_info);
if (cmdl_len <= 0 || (cmdl_len > SA_MAX_CMDL_WORDS * sizeof(u32)))
goto badkey;
ctx->enc.cmdl_size = cmdl_len;
/* Setup Decryption Security Context & Command label template */
if (sa_init_sc(&ctx->dec, ctx->dev_data->match_data, key, keylen, NULL, 0,
ad, 0, &ctx->dec.epib[1]))
goto badkey;
cfg.enc_eng_id = ad->enc_eng.eng_id;
cmdl_len = sa_format_cmdl_gen(&cfg, (u8 *)ctx->dec.cmdl,
&ctx->dec.cmdl_upd_info);
if (cmdl_len <= 0 || (cmdl_len > SA_MAX_CMDL_WORDS * sizeof(u32)))
goto badkey;
ctx->dec.cmdl_size = cmdl_len;
ctx->iv_idx = ad->iv_idx;
return 0;
badkey:
dev_err(sa_k3_dev, "%s: badkey\n", __func__);
return -EINVAL;
}
static int sa_aes_cbc_setkey(struct crypto_skcipher *tfm, const u8 *key,
unsigned int keylen)
{
struct algo_data ad = { 0 };
/* Convert the key size (16/24/32) to the key size index (0/1/2) */
int key_idx = (keylen >> 3) - 2;
if (key_idx >= 3)
return -EINVAL;
ad.mci_enc = mci_cbc_enc_array[key_idx];
ad.mci_dec = mci_cbc_dec_array[key_idx];
ad.inv_key = true;
ad.ealg_id = SA_EALG_ID_AES_CBC;
ad.iv_idx = 4;
ad.iv_out_size = 16;
return sa_cipher_setkey(tfm, key, keylen, &ad);
}
static int sa_aes_ecb_setkey(struct crypto_skcipher *tfm, const u8 *key,
unsigned int keylen)
{
struct algo_data ad = { 0 };
/* Convert the key size (16/24/32) to the key size index (0/1/2) */
int key_idx = (keylen >> 3) - 2;
if (key_idx >= 3)
return -EINVAL;
ad.mci_enc = mci_ecb_enc_array[key_idx];
ad.mci_dec = mci_ecb_dec_array[key_idx];
ad.inv_key = true;
ad.ealg_id = SA_EALG_ID_AES_ECB;
return sa_cipher_setkey(tfm, key, keylen, &ad);
}
static int sa_3des_cbc_setkey(struct crypto_skcipher *tfm, const u8 *key,
unsigned int keylen)
{
struct algo_data ad = { 0 };
ad.mci_enc = mci_cbc_3des_enc_array;
ad.mci_dec = mci_cbc_3des_dec_array;
ad.ealg_id = SA_EALG_ID_3DES_CBC;
ad.iv_idx = 6;
ad.iv_out_size = 8;
return sa_cipher_setkey(tfm, key, keylen, &ad);
}
static int sa_3des_ecb_setkey(struct crypto_skcipher *tfm, const u8 *key,
unsigned int keylen)
{