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/* SPDX-License-Identifier: GPL-2.0 */
/*
* sun8i-ss.h - hardware cryptographic offloader for
* Allwinner A80/A83T SoC
*
* Copyright (C) 2016-2019 Corentin LABBE <clabbe.montjoie@gmail.com>
*/
#include <crypto/aes.h>
#include <crypto/des.h>
#include <crypto/engine.h>
#include <crypto/skcipher.h>
#include <linux/atomic.h>
#include <linux/debugfs.h>
#include <linux/crypto.h>
#define SS_ENCRYPTION 0
#define SS_DECRYPTION BIT(6)
#define SS_ALG_AES 0
#define SS_ALG_DES (1 << 2)
#define SS_ALG_3DES (2 << 2)
#define SS_CTL_REG 0x00
#define SS_INT_CTL_REG 0x04
#define SS_INT_STA_REG 0x08
#define SS_KEY_ADR_REG 0x10
#define SS_IV_ADR_REG 0x18
#define SS_SRC_ADR_REG 0x20
#define SS_DST_ADR_REG 0x28
#define SS_LEN_ADR_REG 0x30
#define SS_ID_NOTSUPP 0xFF
#define SS_ID_CIPHER_AES 0
#define SS_ID_CIPHER_DES 1
#define SS_ID_CIPHER_DES3 2
#define SS_ID_CIPHER_MAX 3
#define SS_ID_OP_ECB 0
#define SS_ID_OP_CBC 1
#define SS_ID_OP_MAX 2
#define SS_AES_128BITS 0
#define SS_AES_192BITS 1
#define SS_AES_256BITS 2
#define SS_OP_ECB 0
#define SS_OP_CBC (1 << 13)
#define SS_FLOW0 BIT(30)
#define SS_FLOW1 BIT(31)
#define MAX_SG 8
#define MAXFLOW 2
#define SS_MAX_CLOCKS 2
#define SS_DIE_ID_SHIFT 20
#define SS_DIE_ID_MASK 0x07
/*
* struct ss_clock - Describe clocks used by sun8i-ss
* @name: Name of clock needed by this variant
* @freq: Frequency to set for each clock
* @max_freq: Maximum frequency for each clock
*/
struct ss_clock {
const char *name;
unsigned long freq;
unsigned long max_freq;
};
/*
* struct ss_variant - Describe SS capability for each variant hardware
* @alg_cipher: list of supported ciphers. for each SS_ID_ this will give the
* coresponding SS_ALG_XXX value
* @op_mode: list of supported block modes
* @ss_clks! list of clock needed by this variant
*/
struct ss_variant {
char alg_cipher[SS_ID_CIPHER_MAX];
u32 op_mode[SS_ID_OP_MAX];
struct ss_clock ss_clks[SS_MAX_CLOCKS];
};
struct sginfo {
u32 addr;
u32 len;
};
/*
* struct sun8i_ss_flow - Information used by each flow
* @engine: ptr to the crypto_engine for this flow
* @complete: completion for the current task on this flow
* @status: set to 1 by interrupt if task is done
* @stat_req: number of request done by this flow
*/
struct sun8i_ss_flow {
struct crypto_engine *engine;
struct completion complete;
int status;
#ifdef CONFIG_CRYPTO_DEV_SUN8I_SS_DEBUG
unsigned long stat_req;
#endif
};
/*
* struct sun8i_ss_dev - main container for all this driver information
* @base: base address of SS
* @ssclks: clocks used by SS
* @reset: pointer to reset controller
* @dev: the platform device
* @mlock: Control access to device registers
* @flows: array of all flow
* @flow: flow to use in next request
* @variant: pointer to variant specific data
* @dbgfs_dir: Debugfs dentry for statistic directory
* @dbgfs_stats: Debugfs dentry for statistic counters
*/
struct sun8i_ss_dev {
void __iomem *base;
struct clk *ssclks[SS_MAX_CLOCKS];
struct reset_control *reset;
struct device *dev;
struct mutex mlock;
struct sun8i_ss_flow *flows;
atomic_t flow;
const struct ss_variant *variant;
#ifdef CONFIG_CRYPTO_DEV_SUN8I_SS_DEBUG
struct dentry *dbgfs_dir;
struct dentry *dbgfs_stats;
#endif
};
/*
* struct sun8i_cipher_req_ctx - context for a skcipher request
* @t_src: list of mapped SGs with their size
* @t_dst: list of mapped SGs with their size
* @p_key: DMA address of the key
* @p_iv: DMA address of the IV
* @method: current algorithm for this request
* @op_mode: op_mode for this request
* @op_dir: direction (encrypt vs decrypt) for this request
* @flow: the flow to use for this request
* @ivlen: size of biv
* @keylen: keylen for this request
* @biv: buffer which contain the IV
*/
struct sun8i_cipher_req_ctx {
struct sginfo t_src[MAX_SG];
struct sginfo t_dst[MAX_SG];
u32 p_key;
u32 p_iv;
u32 method;
u32 op_mode;
u32 op_dir;
int flow;
unsigned int ivlen;
unsigned int keylen;
void *biv;
};
/*
* struct sun8i_cipher_tfm_ctx - context for a skcipher TFM
* @enginectx: crypto_engine used by this TFM
* @key: pointer to key data
* @keylen: len of the key
* @ss: pointer to the private data of driver handling this TFM
* @fallback_tfm: pointer to the fallback TFM
*/
struct sun8i_cipher_tfm_ctx {
struct crypto_engine_ctx enginectx;
u32 *key;
u32 keylen;
struct sun8i_ss_dev *ss;
struct crypto_sync_skcipher *fallback_tfm;
};
/*
* struct sun8i_ss_alg_template - crypto_alg template
* @type: the CRYPTO_ALG_TYPE for this template
* @ss_algo_id: the SS_ID for this template
* @ss_blockmode: the type of block operation SS_ID
* @ss: pointer to the sun8i_ss_dev structure associated with
* this template
* @alg: one of sub struct must be used
* @stat_req: number of request done on this template
* @stat_fb: total of all data len done on this template
*/
struct sun8i_ss_alg_template {
u32 type;
u32 ss_algo_id;
u32 ss_blockmode;
struct sun8i_ss_dev *ss;
union {
struct skcipher_alg skcipher;
} alg;
#ifdef CONFIG_CRYPTO_DEV_SUN8I_SS_DEBUG
unsigned long stat_req;
unsigned long stat_fb;
#endif
};
int sun8i_ss_enqueue(struct crypto_async_request *areq, u32 type);
int sun8i_ss_aes_setkey(struct crypto_skcipher *tfm, const u8 *key,
unsigned int keylen);
int sun8i_ss_des3_setkey(struct crypto_skcipher *tfm, const u8 *key,
unsigned int keylen);
int sun8i_ss_cipher_init(struct crypto_tfm *tfm);
void sun8i_ss_cipher_exit(struct crypto_tfm *tfm);
int sun8i_ss_skdecrypt(struct skcipher_request *areq);
int sun8i_ss_skencrypt(struct skcipher_request *areq);
int sun8i_ss_get_engine_number(struct sun8i_ss_dev *ss);
int sun8i_ss_run_task(struct sun8i_ss_dev *ss, struct sun8i_cipher_req_ctx *rctx, const char *name);
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