Here are functions used to setup/prepare hardware registers for all algorithms supported by the crypto block. It also exports few helper functions needed by algorithms: - to check hardware status - to start crypto hardware - to translate data stream to big endian form Signed-off-by: Stanimir Varbanov <svarbanov@xxxxxxxxxx> --- drivers/crypto/qce/common.c | 424 ++++++++++++++++++++++++++++++++++++++++++++ drivers/crypto/qce/common.h | 111 ++++++++++++ 2 files changed, 535 insertions(+) create mode 100644 drivers/crypto/qce/common.c create mode 100644 drivers/crypto/qce/common.h diff --git a/drivers/crypto/qce/common.c b/drivers/crypto/qce/common.c new file mode 100644 index 000000000000..d9f32d6fc23b --- /dev/null +++ b/drivers/crypto/qce/common.c @@ -0,0 +1,424 @@ +/* + * Copyright (c) 2012-2014, The Linux Foundation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only 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/err.h> +#include <linux/interrupt.h> +#include <linux/types.h> +#include <crypto/scatterwalk.h> +#include <crypto/sha.h> + +#include "dma.h" +#include "core.h" +#include "common.h" +#include "regs-v5.h" +#include "sha.h" +#include "cipher.h" + +#define QCE_SECTOR_SIZE 512 + +static inline u32 qce_read(struct qce_device *qce, u32 offset) +{ + return readl(qce->base + offset); +} + +static inline void qce_write(struct qce_device *qce, u32 offset, u32 val) +{ + writel(val, qce->base + offset); +} + +static inline void qce_write_array(struct qce_device *qce, u32 offset, + const u32 *val, unsigned int len) +{ + int i; + + for (i = 0; i < len; i++) + qce_write(qce, offset + i * sizeof(u32), val[i]); +} + +static inline void +qce_clear_array(struct qce_device *qce, u32 offset, unsigned int len) +{ + int i; + + for (i = 0; i < len; i++) + qce_write(qce, offset + i * sizeof(u32), 0); +} + +static u32 qce_encr_cfg(u32 flags, u32 aes_key_size) +{ + u32 cfg = 0; + + if (IS_AES(flags)) { + if (aes_key_size == AES_KEYSIZE_128) + cfg |= ENCR_KEY_SZ_AES128 << ENCR_KEY_SZ; + else if (aes_key_size == AES_KEYSIZE_256) + cfg |= ENCR_KEY_SZ_AES256 << ENCR_KEY_SZ; + } + + if (IS_AES(flags)) + cfg |= ENCR_ALG_AES << ENCR_ALG; + else if (IS_DES(flags) || IS_3DES(flags)) + cfg |= ENCR_ALG_DES << ENCR_ALG; + + if (IS_DES(flags)) + cfg |= ENCR_KEY_SZ_DES << ENCR_KEY_SZ; + + if (IS_3DES(flags)) + cfg |= ENCR_KEY_SZ_3DES << ENCR_KEY_SZ; + + switch (flags & QCE_MODE_MASK) { + case QCE_MODE_ECB: + cfg |= ENCR_MODE_ECB << ENCR_MODE; + break; + case QCE_MODE_CBC: + cfg |= ENCR_MODE_CBC << ENCR_MODE; + break; + case QCE_MODE_CTR: + cfg |= ENCR_MODE_CTR << ENCR_MODE; + break; + case QCE_MODE_XTS: + cfg |= ENCR_MODE_XTS << ENCR_MODE; + break; + case QCE_MODE_CCM: + cfg |= ENCR_MODE_CCM << ENCR_MODE; + cfg |= LAST_CCM_XFR << LAST_CCM; + break; + default: + return ~0; + } + + return cfg; +} + +static u32 qce_auth_cfg(u32 flags, u32 key_size) +{ + u32 cfg = 0; + + if (IS_AES(flags) && (IS_CCM(flags) || IS_CMAC(flags))) + cfg |= AUTH_ALG_AES << AUTH_ALG; + else + cfg |= AUTH_ALG_SHA << AUTH_ALG; + + if (IS_CCM(flags) || IS_CMAC(flags)) { + if (key_size == AES_KEYSIZE_128) + cfg |= AUTH_KEY_SZ_AES128 << AUTH_KEY_SIZE; + else if (key_size == AES_KEYSIZE_256) + cfg |= AUTH_KEY_SZ_AES256 << AUTH_KEY_SIZE; + } + + if (IS_SHA1(flags) || IS_SHA1_HMAC(flags)) + cfg |= AUTH_SIZE_SHA1 << AUTH_SIZE; + else if (IS_SHA256(flags) || IS_SHA256_HMAC(flags)) + cfg |= AUTH_SIZE_SHA256 << AUTH_SIZE; + else if (IS_CMAC(flags)) + cfg |= AUTH_SIZE_ENUM_16_BYTES << AUTH_SIZE; + + if (IS_SHA1(flags) || IS_SHA256(flags)) + cfg |= AUTH_MODE_HASH << AUTH_MODE; + else if (IS_SHA1_HMAC(flags) || IS_SHA256_HMAC(flags) || + IS_CBC(flags) || IS_CTR(flags)) + cfg |= AUTH_MODE_HMAC << AUTH_MODE; + else if (IS_AES(flags) && IS_CCM(flags)) + cfg |= AUTH_MODE_CCM << AUTH_MODE; + else if (IS_AES(flags) && IS_CMAC(flags)) + cfg |= AUTH_MODE_CMAC << AUTH_MODE; + + if (IS_SHA(flags) || IS_SHA_HMAC(flags)) + cfg |= AUTH_POS_BEFORE << AUTH_POS; + + if (IS_CCM(flags)) + cfg |= QCE_MAX_NONCE_WORDS << AUTH_NONCE_NUM_WORDS; + + if (IS_CBC(flags) || IS_CTR(flags) || IS_CCM(flags) || + IS_CMAC(flags)) + cfg |= BIT(AUTH_LAST) | BIT(AUTH_FIRST); + + return cfg; +} + +static u32 qce_config_reg(struct qce_device *qce, int little) +{ + u32 beats = (qce->burst_size >> 3) - 1; + u32 pipe_pair = qce->pipe_pair_index; + u32 config; + + config = beats << REQ_SIZE | BIT(MASK_DOUT_INTR) | BIT(MASK_DIN_INTR) | + BIT(MASK_OP_DONE_INTR) | BIT(MASK_ERR_INTR) | + pipe_pair << PIPE_SET_SELECT; + config &= ~HIGH_SPD_EN_N; + + if (little) + config |= LITTLE_ENDIAN_MASK; + + return config; +} + +void qce_cpu_to_be32p_array(__be32 *dst, const u8 *src, unsigned int len) +{ + __be32 *d = dst; + const u8 *s = src; + unsigned int n; + + n = len / sizeof(u32); + for (; n > 0; n--) { + *d = cpu_to_be32p((const __u32 *) s); + s += sizeof(__u32); + d++; + } +} + +static void qce_xts_swapiv(u32 *dst, u8 *src, unsigned int ivsize) +{ + u8 swap[QCE_AES_IV_LENGTH]; + u32 i, j; + + if (ivsize > QCE_AES_IV_LENGTH) + return; + + memset(swap, 0, QCE_AES_IV_LENGTH); + + for (i = (QCE_AES_IV_LENGTH - ivsize), j = ivsize - 1; + i < QCE_AES_IV_LENGTH; i++, j--) + swap[i] = src[j]; + + qce_cpu_to_be32p_array(dst, swap, QCE_AES_IV_LENGTH); +} + +static void qce_xtskey(struct qce_device *qce, const u8 *enckey, + unsigned int enckeylen, unsigned int cryptlen) +{ + u32 xtskey[QCE_MAX_CIPHER_KEY_SIZE / sizeof(u32)] = {0}; + unsigned int xtsklen = enckeylen / (2 * sizeof(u32)); + unsigned int xtsdusize; + + qce_cpu_to_be32p_array(xtskey, enckey + enckeylen / 2, enckeylen / 2); + qce_write_array(qce, REG_ENCR_XTS_KEY0, xtskey, xtsklen); + + /* xts du size 512B */ + xtsdusize = min_t(u32, QCE_SECTOR_SIZE, cryptlen); + qce_write(qce, REG_ENCR_XTS_DU_SIZE, xtsdusize); +} + +static void qce_setup_config(struct qce_device *qce) +{ + u32 config; + + /* get big endianness */ + config = qce_config_reg(qce, 0); + + /* clear status */ + qce_write(qce, REG_STATUS, 0); + qce_write(qce, REG_CONFIG, config); +} + +static inline void qce_crypto_go(struct qce_device *qce) +{ + /* issue GO to crypto */ + qce_write(qce, REG_GOPROC, BIT(GO) | BIT(RESULTS_DUMP)); +} + +static int qce_setup_regs_ahash(struct crypto_async_request *async_req, + u32 totallen, u32 offset) +{ + struct ahash_request *req = ahash_request_cast(async_req); + struct crypto_ahash *ahash = __crypto_ahash_cast(req->base.tfm); + struct qce_sha_reqctx *rctx = ahash_request_ctx(req); + struct qce_alg_template *tmpl = to_ahash_tmpl(async_req->tfm); + struct qce_device *qce = tmpl->qce; + unsigned int digestsize = crypto_ahash_digestsize(ahash); + u32 auth[SHA256_DIGEST_SIZE / sizeof(u32)] = {0}; + u32 mackey[QCE_SHA_HMAC_KEY_SIZE / sizeof(u32)] = {0}; + u32 auth_cfg = 0, config; + unsigned int iv_words; + + qce_setup_config(qce); + + if (IS_CMAC(rctx->flags)) { + qce_write(qce, REG_AUTH_SEG_CFG, 0); + qce_write(qce, REG_ENCR_SEG_CFG, 0); + qce_write(qce, REG_ENCR_SEG_SIZE, 0); + qce_clear_array(qce, REG_AUTH_IV0, 16); + qce_clear_array(qce, REG_AUTH_KEY0, 16); + qce_clear_array(qce, REG_AUTH_BYTECNT0, 4); + + auth_cfg = qce_auth_cfg(rctx->flags, rctx->authklen); + } + + if (IS_SHA_HMAC(rctx->flags) || IS_CMAC(rctx->flags)) { + u32 authkey_words = rctx->authklen / sizeof(u32); + + qce_cpu_to_be32p_array(mackey, rctx->authkey, rctx->authklen); + qce_write_array(qce, REG_AUTH_KEY0, mackey, authkey_words); + } + + if (IS_CMAC(rctx->flags)) + goto go_proc; + + /* if not the last, the size has to be on the block boundary */ + if (rctx->last_blk == false && (req->nbytes % SHA256_BLOCK_SIZE)) + return -EINVAL; + + /* write 20/32 bytes, 5/8 words into auth_iv for SHA1/SHA256 */ + if (rctx->first_blk) + memcpy(auth, rctx->digest, digestsize); + else + qce_cpu_to_be32p_array(auth, rctx->digest, digestsize); + + iv_words = (IS_SHA1(rctx->flags) || IS_SHA1_HMAC(rctx->flags)) ? 5 : 8; + qce_write_array(qce, REG_AUTH_IV0, auth, iv_words); + + /* write AUTH_BYTECNT 0/1, start with 0 */ + qce_write_array(qce, REG_AUTH_BYTECNT0, rctx->byte_count, 2); + + auth_cfg = qce_auth_cfg(rctx->flags, 0); + + /* set/reset last bit in AUTH_SEG_CFG register */ + if (rctx->last_blk) + auth_cfg |= BIT(AUTH_LAST); + else + auth_cfg &= ~BIT(AUTH_LAST); + + if (rctx->first_blk) + auth_cfg |= BIT(AUTH_FIRST); + else + auth_cfg &= ~BIT(AUTH_FIRST); + +go_proc: + /* get little endianness */ + config = qce_config_reg(qce, 1); + + qce_write(qce, REG_AUTH_SEG_CFG, auth_cfg); + qce_write(qce, REG_AUTH_SEG_SIZE, req->nbytes); + qce_write(qce, REG_AUTH_SEG_START, 0); + qce_write(qce, REG_ENCR_SEG_CFG, 0); + qce_write(qce, REG_SEG_SIZE, req->nbytes); + qce_write(qce, REG_CONFIG, config); + + qce_crypto_go(qce); + + return 0; +} + +static int qce_setup_regs_ablkcipher(struct crypto_async_request *async_req, + u32 totallen, u32 offset) +{ + struct ablkcipher_request *req = ablkcipher_request_cast(async_req); + struct qce_cipher_reqctx *rctx = ablkcipher_request_ctx(req); + struct qce_cipher_ctx *ctx = crypto_tfm_ctx(async_req->tfm); + struct qce_alg_template *tmpl = to_cipher_tmpl(async_req->tfm); + struct qce_device *qce = tmpl->qce; + u32 enckey[QCE_MAX_CIPHER_KEY_SIZE / sizeof(u32)] = {0}; + u32 enciv[QCE_MAX_IV_SIZE / sizeof(u32)] = {0}; + unsigned int enckey_words, enciv_words; + unsigned int keylen; + u32 encr_cfg = 0, auth_cfg = 0, config; + unsigned int ivsize = rctx->ivsize; + u32 flags = rctx->flags; + + qce_setup_config(qce); + + if (IS_XTS(flags)) + keylen = ctx->enc_keylen / 2; + else + keylen = ctx->enc_keylen; + + qce_cpu_to_be32p_array(enckey, ctx->enc_key, keylen); + enckey_words = keylen / sizeof(u32); + + qce_write(qce, REG_AUTH_SEG_CFG, auth_cfg); + + encr_cfg = qce_encr_cfg(flags, keylen); + + if (IS_DES(flags)) { + enciv_words = 2; + enckey_words = 2; + } else if (IS_3DES(flags)) { + enciv_words = 2; + enckey_words = 6; + } else if (IS_AES(flags)) { + if (IS_XTS(flags)) + qce_xtskey(qce, ctx->enc_key, ctx->enc_keylen, + rctx->cryptlen); + enciv_words = 4; + } else { + return -EINVAL; + } + + qce_write_array(qce, REG_ENCR_KEY0, enckey, enckey_words); + + if (!IS_ECB(flags)) { + if (IS_XTS(flags)) + qce_xts_swapiv(enciv, rctx->iv, ivsize); + else + qce_cpu_to_be32p_array(enciv, rctx->iv, ivsize); + + qce_write_array(qce, REG_CNTR0_IV0, enciv, enciv_words); + } + + if (IS_ENCRYPT(flags)) + encr_cfg |= BIT(ENCODE); + + qce_write(qce, REG_ENCR_SEG_CFG, encr_cfg); + qce_write(qce, REG_ENCR_SEG_SIZE, rctx->cryptlen); + + /* get little endianness */ + config = qce_config_reg(qce, 1); + + qce_write(qce, REG_ENCR_SEG_START, offset & 0xffff); + qce_write(qce, REG_CNTR_MASK, 0xffffffff); + qce_write(qce, REG_SEG_SIZE, totallen); + qce_write(qce, REG_CONFIG, config); + + qce_crypto_go(qce); + + return 0; +} + +int qce_start(struct crypto_async_request *async_req, u32 type, u32 totallen, + u32 offset) +{ + int rc; + + switch (type) { + case CRYPTO_ALG_TYPE_ABLKCIPHER: + rc = qce_setup_regs_ablkcipher(async_req, totallen, offset); + break; + case CRYPTO_ALG_TYPE_AHASH: + rc = qce_setup_regs_ahash(async_req, totallen, offset); + break; + default: + return -EINVAL; + } + + return rc; +} + +#define STATUS_ERRORS (BIT(SW_ERR) | BIT(AXI_ERR) | BIT(HSD_ERR)) + +int qce_check_status(struct qce_device *qce, u32 *status) +{ + int rc = 0; + + *status = qce_read(qce, REG_STATUS); + + /* + * Don't use result dump status. The operation may not be complete. + * Instead, use the status we just read from device. In case, we need to + * use result_status from result dump the result_status needs to be byte + * swapped, since we set the device to little endian. + */ + if (*status & STATUS_ERRORS || !(*status & BIT(OPERATION_DONE))) + rc = -ENXIO; + + return rc; +} diff --git a/drivers/crypto/qce/common.h b/drivers/crypto/qce/common.h new file mode 100644 index 000000000000..69ab21d02c6e --- /dev/null +++ b/drivers/crypto/qce/common.h @@ -0,0 +1,111 @@ +/* + * Copyright (c) 2010-2014, The Linux Foundation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only 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. + */ + +#ifndef _COMMON_H_ +#define _COMMON_H_ + +#include <linux/crypto.h> +#include <linux/types.h> +#include <crypto/aes.h> +#include <crypto/des.h> +#include <crypto/hash.h> + +/* key size in bytes */ +#define QCE_SHA_HMAC_KEY_SIZE 64 +#define QCE_DES_KEY_SIZE DES_KEY_SIZE +#define QCE_MAX_CIPHER_KEY_SIZE AES_KEYSIZE_256 +#define QCE_MAX_KEY_SIZE 64 + +/* IV length in bytes */ +#define QCE_AES_IV_LENGTH AES_BLOCK_SIZE +/* max of AES_BLOCK_SIZE, DES3_EDE_BLOCK_SIZE */ +#define QCE_MAX_IV_SIZE AES_BLOCK_SIZE + +/* maximum nonce bytes */ +#define QCE_MAX_NONCE 16 +#define QCE_MAX_NONCE_WORDS (QCE_MAX_NONCE / sizeof(u32)) + +/* burst size alignment requirement */ +#define QCE_MAX_ALIGN_SIZE 64 + +/* maximum data transfer block size between BAM and CE */ +#define QCE_BAM_BURST_SIZE 64 + +/* cipher algorithms */ +#define QCE_ALG_DES BIT(0) +#define QCE_ALG_3DES BIT(1) +#define QCE_ALG_AES BIT(2) + +/* hash and hmac algorithms */ +#define QCE_HASH_SHA1 BIT(3) +#define QCE_HASH_SHA256 BIT(4) +#define QCE_HASH_SHA1_HMAC BIT(5) +#define QCE_HASH_SHA256_HMAC BIT(6) +#define QCE_HASH_AES_CMAC BIT(7) + +/* cipher modes */ +#define QCE_MODE_CBC BIT(8) +#define QCE_MODE_ECB BIT(9) +#define QCE_MODE_CTR BIT(10) +#define QCE_MODE_XTS BIT(11) +#define QCE_MODE_CCM BIT(12) +#define QCE_MODE_MASK 0x1f00 + +/* cipher encryption/decryption operations */ +#define QCE_ENCRYPT BIT(13) +#define QCE_DECRYPT BIT(14) + +#define IS_DES(flags) (flags & QCE_ALG_DES) +#define IS_3DES(flags) (flags & QCE_ALG_3DES) +#define IS_AES(flags) (flags & QCE_ALG_AES) + +#define IS_SHA1(flags) (flags & QCE_HASH_SHA1) +#define IS_SHA256(flags) (flags & QCE_HASH_SHA256) +#define IS_SHA1_HMAC(flags) (flags & QCE_HASH_SHA1_HMAC) +#define IS_SHA256_HMAC(flags) (flags & QCE_HASH_SHA256_HMAC) +#define IS_CMAC(flags) (flags & QCE_HASH_AES_CMAC) +#define IS_SHA(flags) (IS_SHA1(flags) || IS_SHA256(flags)) +#define IS_SHA_HMAC(flags) \ + (IS_SHA1_HMAC(flags) || IS_SHA256_HMAC(flags)) + +#define IS_CBC(mode) (mode & QCE_MODE_CBC) +#define IS_ECB(mode) (mode & QCE_MODE_ECB) +#define IS_CTR(mode) (mode & QCE_MODE_CTR) +#define IS_XTS(mode) (mode & QCE_MODE_XTS) +#define IS_CCM(mode) (mode & QCE_MODE_CCM) + +#define IS_ENCRYPT(dir) (dir & QCE_ENCRYPT) +#define IS_DECRYPT(dir) (dir & QCE_DECRYPT) + +struct qce_alg_template { + struct list_head entry; + u32 crypto_alg_type; + u32 alg_flags; + const __be32 *std_iv; + union { + struct crypto_alg crypto; + struct ahash_alg ahash; + } alg; + struct qce_device *qce; + + int (*async_req_queue)(struct qce_device *qce, + struct crypto_async_request *req); + void (*async_req_done)(struct qce_device *qce, int ret); +}; + +void qce_cpu_to_be32p_array(__be32 *dst, const u8 *src, unsigned int len); +int qce_check_status(struct qce_device *qce, u32 *status); +int qce_start(struct crypto_async_request *async_req, u32 type, u32 totallen, + u32 offset); + +#endif /* _COMMON_H_ */ -- 1.8.4.4 -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html