319 lines
8.8 KiB
C
319 lines
8.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* sun8i-ss.h - hardware cryptographic offloader for
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* Allwinner A80/A83T SoC
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*
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* Copyright (C) 2016-2019 Corentin LABBE <clabbe.montjoie@gmail.com>
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*/
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#include <crypto/aes.h>
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#include <crypto/des.h>
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#include <crypto/engine.h>
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#include <crypto/rng.h>
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#include <crypto/skcipher.h>
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#include <linux/atomic.h>
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#include <linux/debugfs.h>
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#include <linux/crypto.h>
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#include <crypto/internal/hash.h>
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#include <crypto/md5.h>
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#include <crypto/sha1.h>
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#include <crypto/sha2.h>
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#define SS_START 1
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#define SS_ENCRYPTION 0
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#define SS_DECRYPTION BIT(6)
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#define SS_ALG_AES 0
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#define SS_ALG_DES (1 << 2)
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#define SS_ALG_3DES (2 << 2)
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#define SS_ALG_MD5 (3 << 2)
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#define SS_ALG_PRNG (4 << 2)
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#define SS_ALG_SHA1 (6 << 2)
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#define SS_ALG_SHA224 (7 << 2)
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#define SS_ALG_SHA256 (8 << 2)
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#define SS_CTL_REG 0x00
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#define SS_INT_CTL_REG 0x04
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#define SS_INT_STA_REG 0x08
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#define SS_KEY_ADR_REG 0x10
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#define SS_IV_ADR_REG 0x18
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#define SS_SRC_ADR_REG 0x20
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#define SS_DST_ADR_REG 0x28
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#define SS_LEN_ADR_REG 0x30
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#define SS_ID_NOTSUPP 0xFF
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#define SS_ID_CIPHER_AES 0
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#define SS_ID_CIPHER_DES 1
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#define SS_ID_CIPHER_DES3 2
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#define SS_ID_CIPHER_MAX 3
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#define SS_ID_OP_ECB 0
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#define SS_ID_OP_CBC 1
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#define SS_ID_OP_MAX 2
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#define SS_AES_128BITS 0
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#define SS_AES_192BITS 1
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#define SS_AES_256BITS 2
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#define SS_OP_ECB 0
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#define SS_OP_CBC (1 << 13)
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#define SS_ID_HASH_MD5 0
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#define SS_ID_HASH_SHA1 1
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#define SS_ID_HASH_SHA224 2
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#define SS_ID_HASH_SHA256 3
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#define SS_ID_HASH_MAX 4
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#define SS_FLOW0 BIT(30)
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#define SS_FLOW1 BIT(31)
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#define SS_PRNG_CONTINUE BIT(18)
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#define MAX_SG 8
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#define MAXFLOW 2
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#define SS_MAX_CLOCKS 2
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#define SS_DIE_ID_SHIFT 20
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#define SS_DIE_ID_MASK 0x07
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#define PRNG_DATA_SIZE (160 / 8)
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#define PRNG_SEED_SIZE DIV_ROUND_UP(175, 8)
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#define MAX_PAD_SIZE 4096
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/*
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* struct ss_clock - Describe clocks used by sun8i-ss
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* @name: Name of clock needed by this variant
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* @freq: Frequency to set for each clock
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* @max_freq: Maximum frequency for each clock
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*/
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struct ss_clock {
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const char *name;
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unsigned long freq;
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unsigned long max_freq;
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};
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/*
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* struct ss_variant - Describe SS capability for each variant hardware
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* @alg_cipher: list of supported ciphers. for each SS_ID_ this will give the
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* coresponding SS_ALG_XXX value
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* @alg_hash: list of supported hashes. for each SS_ID_ this will give the
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* corresponding SS_ALG_XXX value
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* @op_mode: list of supported block modes
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* @ss_clks: list of clock needed by this variant
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*/
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struct ss_variant {
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char alg_cipher[SS_ID_CIPHER_MAX];
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char alg_hash[SS_ID_HASH_MAX];
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u32 op_mode[SS_ID_OP_MAX];
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struct ss_clock ss_clks[SS_MAX_CLOCKS];
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};
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struct sginfo {
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u32 addr;
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u32 len;
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};
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/*
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* struct sun8i_ss_flow - Information used by each flow
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* @engine: ptr to the crypto_engine for this flow
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* @complete: completion for the current task on this flow
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* @status: set to 1 by interrupt if task is done
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* @stat_req: number of request done by this flow
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* @iv: list of IV to use for each step
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* @biv: buffer which contain the backuped IV
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* @pad: padding buffer for hash operations
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* @result: buffer for storing the result of hash operations
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*/
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struct sun8i_ss_flow {
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struct crypto_engine *engine;
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struct completion complete;
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int status;
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u8 *iv[MAX_SG];
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u8 *biv;
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void *pad;
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void *result;
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#ifdef CONFIG_CRYPTO_DEV_SUN8I_SS_DEBUG
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unsigned long stat_req;
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#endif
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};
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/*
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* struct sun8i_ss_dev - main container for all this driver information
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* @base: base address of SS
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* @ssclks: clocks used by SS
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* @reset: pointer to reset controller
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* @dev: the platform device
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* @mlock: Control access to device registers
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* @flows: array of all flow
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* @flow: flow to use in next request
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* @variant: pointer to variant specific data
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* @dbgfs_dir: Debugfs dentry for statistic directory
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* @dbgfs_stats: Debugfs dentry for statistic counters
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*/
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struct sun8i_ss_dev {
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void __iomem *base;
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struct clk *ssclks[SS_MAX_CLOCKS];
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struct reset_control *reset;
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struct device *dev;
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struct mutex mlock;
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struct sun8i_ss_flow *flows;
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atomic_t flow;
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const struct ss_variant *variant;
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#ifdef CONFIG_CRYPTO_DEV_SUN8I_SS_DEBUG
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struct dentry *dbgfs_dir;
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struct dentry *dbgfs_stats;
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#endif
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};
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/*
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* struct sun8i_cipher_req_ctx - context for a skcipher request
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* @t_src: list of mapped SGs with their size
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* @t_dst: list of mapped SGs with their size
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* @p_key: DMA address of the key
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* @p_iv: DMA address of the IVs
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* @niv: Number of IVs DMA mapped
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* @method: current algorithm for this request
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* @op_mode: op_mode for this request
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* @op_dir: direction (encrypt vs decrypt) for this request
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* @flow: the flow to use for this request
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* @ivlen: size of IVs
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* @keylen: keylen for this request
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* @fallback_req: request struct for invoking the fallback skcipher TFM
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*/
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struct sun8i_cipher_req_ctx {
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struct sginfo t_src[MAX_SG];
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struct sginfo t_dst[MAX_SG];
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u32 p_key;
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u32 p_iv[MAX_SG];
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int niv;
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u32 method;
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u32 op_mode;
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u32 op_dir;
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int flow;
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unsigned int ivlen;
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unsigned int keylen;
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struct skcipher_request fallback_req; // keep at the end
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};
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/*
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* struct sun8i_cipher_tfm_ctx - context for a skcipher TFM
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* @key: pointer to key data
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* @keylen: len of the key
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* @ss: pointer to the private data of driver handling this TFM
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* @fallback_tfm: pointer to the fallback TFM
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*/
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struct sun8i_cipher_tfm_ctx {
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u32 *key;
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u32 keylen;
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struct sun8i_ss_dev *ss;
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struct crypto_skcipher *fallback_tfm;
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};
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/*
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* struct sun8i_ss_prng_ctx - context for PRNG TFM
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* @seed: The seed to use
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* @slen: The size of the seed
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*/
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struct sun8i_ss_rng_tfm_ctx {
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void *seed;
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unsigned int slen;
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};
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/*
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* struct sun8i_ss_hash_tfm_ctx - context for an ahash TFM
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* @fallback_tfm: pointer to the fallback TFM
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* @ss: pointer to the private data of driver handling this TFM
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*/
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struct sun8i_ss_hash_tfm_ctx {
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struct crypto_ahash *fallback_tfm;
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struct sun8i_ss_dev *ss;
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u8 *ipad;
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u8 *opad;
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u8 key[SHA256_BLOCK_SIZE];
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int keylen;
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};
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/*
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* struct sun8i_ss_hash_reqctx - context for an ahash request
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* @t_src: list of DMA address and size for source SGs
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* @t_dst: list of DMA address and size for destination SGs
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* @fallback_req: pre-allocated fallback request
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* @method: the register value for the algorithm used by this request
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* @flow: the flow to use for this request
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*/
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struct sun8i_ss_hash_reqctx {
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struct sginfo t_src[MAX_SG];
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struct sginfo t_dst[MAX_SG];
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struct ahash_request fallback_req;
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u32 method;
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int flow;
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};
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/*
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* struct sun8i_ss_alg_template - crypto_alg template
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* @type: the CRYPTO_ALG_TYPE for this template
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* @ss_algo_id: the SS_ID for this template
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* @ss_blockmode: the type of block operation SS_ID
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* @ss: pointer to the sun8i_ss_dev structure associated with
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* this template
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* @alg: one of sub struct must be used
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* @stat_req: number of request done on this template
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* @stat_fb: number of request which has fallbacked
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* @stat_bytes: total data size done by this template
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*/
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struct sun8i_ss_alg_template {
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u32 type;
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u32 ss_algo_id;
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u32 ss_blockmode;
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struct sun8i_ss_dev *ss;
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union {
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struct skcipher_engine_alg skcipher;
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struct rng_alg rng;
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struct ahash_engine_alg hash;
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} alg;
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unsigned long stat_req;
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unsigned long stat_fb;
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unsigned long stat_bytes;
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unsigned long stat_fb_len;
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unsigned long stat_fb_sglen;
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unsigned long stat_fb_align;
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unsigned long stat_fb_sgnum;
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char fbname[CRYPTO_MAX_ALG_NAME];
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};
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int sun8i_ss_aes_setkey(struct crypto_skcipher *tfm, const u8 *key,
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unsigned int keylen);
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int sun8i_ss_des3_setkey(struct crypto_skcipher *tfm, const u8 *key,
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unsigned int keylen);
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int sun8i_ss_cipher_init(struct crypto_tfm *tfm);
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void sun8i_ss_cipher_exit(struct crypto_tfm *tfm);
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int sun8i_ss_handle_cipher_request(struct crypto_engine *engine, void *areq);
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int sun8i_ss_skdecrypt(struct skcipher_request *areq);
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int sun8i_ss_skencrypt(struct skcipher_request *areq);
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int sun8i_ss_get_engine_number(struct sun8i_ss_dev *ss);
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int sun8i_ss_run_task(struct sun8i_ss_dev *ss, struct sun8i_cipher_req_ctx *rctx, const char *name);
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int sun8i_ss_prng_generate(struct crypto_rng *tfm, const u8 *src,
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unsigned int slen, u8 *dst, unsigned int dlen);
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int sun8i_ss_prng_seed(struct crypto_rng *tfm, const u8 *seed, unsigned int slen);
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int sun8i_ss_prng_init(struct crypto_tfm *tfm);
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void sun8i_ss_prng_exit(struct crypto_tfm *tfm);
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int sun8i_ss_hash_init_tfm(struct crypto_ahash *tfm);
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void sun8i_ss_hash_exit_tfm(struct crypto_ahash *tfm);
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int sun8i_ss_hash_init(struct ahash_request *areq);
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int sun8i_ss_hash_export(struct ahash_request *areq, void *out);
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int sun8i_ss_hash_import(struct ahash_request *areq, const void *in);
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int sun8i_ss_hash_final(struct ahash_request *areq);
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int sun8i_ss_hash_update(struct ahash_request *areq);
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int sun8i_ss_hash_finup(struct ahash_request *areq);
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int sun8i_ss_hash_digest(struct ahash_request *areq);
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int sun8i_ss_hash_run(struct crypto_engine *engine, void *breq);
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int sun8i_ss_hmac_setkey(struct crypto_ahash *ahash, const u8 *key,
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unsigned int keylen);
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