/* SPDX-License-Identifier: GPL-2.0-only */
/*
* sun4i-ss.h - hardware cryptographic accelerator for Allwinner A20 SoC
*
* Copyright (C) 2013-2015 Corentin LABBE <clabbe.montjoie@gmail.com>
*
* Support AES cipher with 128,192,256 bits keysize.
* Support MD5 and SHA1 hash algorithms.
* Support DES and 3DES
*
* You could find the datasheet in Documentation/arch/arm/sunxi.rst
*/
#include <linux/clk.h>
#include <linux/crypto.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/reset.h>
#include <crypto/scatterwalk.h>
#include <linux/scatterlist.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/pm_runtime.h>
#include <crypto/md5.h>
#include <crypto/skcipher.h>
#include <crypto/sha1.h>
#include <crypto/hash.h>
#include <crypto/internal/hash.h>
#include <crypto/internal/skcipher.h>
#include <crypto/aes.h>
#include <crypto/internal/des.h>
#include <crypto/internal/rng.h>
#include <crypto/rng.h>
#define SS_CTL 0x00
#define SS_KEY0 0x04
#define SS_KEY1 0x08
#define SS_KEY2 0x0C
#define SS_KEY3 0x10
#define SS_KEY4 0x14
#define SS_KEY5 0x18
#define SS_KEY6 0x1C
#define SS_KEY7 0x20
#define SS_IV0 0x24
#define SS_IV1 0x28
#define SS_IV2 0x2C
#define SS_IV3 0x30
#define SS_FCSR 0x44
#define SS_MD0 0x4C
#define SS_MD1 0x50
#define SS_MD2 0x54
#define SS_MD3 0x58
#define SS_MD4 0x5C
#define SS_RXFIFO 0x200
#define SS_TXFIFO 0x204
/* SS_CTL configuration values */
/* PRNG generator mode - bit 15 */
#define SS_PRNG_ONESHOT (0 << 15)
#define SS_PRNG_CONTINUE (1 << 15)
/* IV mode for hash */
#define SS_IV_ARBITRARY (1 << 14)
/* SS operation mode - bits 12-13 */
#define SS_ECB (0 << 12)
#define SS_CBC (1 << 12)
#define SS_CTS (3 << 12)
/* Counter width for CNT mode - bits 10-11 */
#define SS_CNT_16BITS (0 << 10)
#define SS_CNT_32BITS (1 << 10)
#define SS_CNT_64BITS (2 << 10)
/* Key size for AES - bits 8-9 */
#define SS_AES_128BITS (0 << 8)
#define SS_AES_192BITS (1 << 8)
#define SS_AES_256BITS (2 << 8)
/* Operation direction - bit 7 */
#define SS_ENCRYPTION (0 << 7)
#define SS_DECRYPTION (1 << 7)
/* SS Method - bits 4-6 */
#define SS_OP_AES (0 << 4)
#define SS_OP_DES (1 << 4)
#define SS_OP_3DES (2 << 4)
#define SS_OP_SHA1 (3 << 4)
#define SS_OP_MD5 (4 << 4)
#define SS_OP_PRNG (5 << 4)
/* Data end bit - bit 2 */
#define SS_DATA_END (1 << 2)
/* PRNG start bit - bit 1 */
#define SS_PRNG_START (1 << 1)
/* SS Enable bit - bit 0 */
#define SS_DISABLED (0 << 0)
#define SS_ENABLED (1 << 0)
/* SS_FCSR configuration values */
/* RX FIFO status - bit 30 */
#define SS_RXFIFO_FREE (1 << 30)
/* RX FIFO empty spaces - bits 24-29 */
#define SS_RXFIFO_SPACES(val) (((val) >> 24) & 0x3f)
/* TX FIFO status - bit 22 */
#define SS_TXFIFO_AVAILABLE (1 << 22)
/* TX FIFO available spaces - bits 16-21 */
#define SS_TXFIFO_SPACES(val) (((val) >> 16) & 0x3f)
#define SS_RX_MAX 32
#define SS_RX_DEFAULT SS_RX_MAX
#define SS_TX_MAX 33
#define SS_RXFIFO_EMP_INT_PENDING (1 << 10)
#define SS_TXFIFO_AVA_INT_PENDING (1 << 8)
#define SS_RXFIFO_EMP_INT_ENABLE (1 << 2)
#define SS_TXFIFO_AVA_INT_ENABLE (1 << 0)
#define SS_SEED_LEN 192
#define SS_DATA_LEN 160
/*
* struct ss_variant - Describe SS hardware variant
* @sha1_in_be: The SHA1 digest is given by SS in BE, and so need to be inverted.
*/
struct ss_variant {
bool sha1_in_be;
};
struct sun4i_ss_ctx {
const struct ss_variant *variant;
void __iomem *base;
int irq;
struct clk *busclk;
struct clk *ssclk;
struct reset_control *reset;
struct device *dev;
struct resource *res;
char buf[4 * SS_RX_MAX];/* buffer for linearize SG src */
char bufo[4 * SS_TX_MAX]; /* buffer for linearize SG dst */
spinlock_t slock; /* control the use of the device */
#ifdef CONFIG_CRYPTO_DEV_SUN4I_SS_PRNG
u32 seed[SS_SEED_LEN / BITS_PER_LONG];
#endif
struct dentry *dbgfs_dir;
struct dentry *dbgfs_stats;
};
struct sun4i_ss_alg_template {
u32 type;
u32 mode;
union {
struct skcipher_alg crypto;
struct ahash_alg hash;
struct rng_alg rng;
} alg;
struct sun4i_ss_ctx *ss;
unsigned long stat_req;
unsigned long stat_fb;
unsigned long stat_bytes;
unsigned long stat_opti;
};
struct sun4i_tfm_ctx {
u32 key[AES_MAX_KEY_SIZE / 4];/* divided by sizeof(u32) */
u32 keylen;
u32 keymode;
struct sun4i_ss_ctx *ss;
struct crypto_skcipher *fallback_tfm;
};
struct sun4i_cipher_req_ctx {
u32 mode;
u8 backup_iv[AES_BLOCK_SIZE];
struct skcipher_request fallback_req; // keep at the end
};
struct sun4i_req_ctx {
u32 mode;
u64 byte_count; /* number of bytes "uploaded" to the device */
u32 hash[5]; /* for storing SS_IVx register */
char buf[64];
unsigned int len;
int flags;
};
int sun4i_hash_crainit(struct crypto_tfm *tfm);
void sun4i_hash_craexit(struct crypto_tfm *tfm);
int sun4i_hash_init(struct ahash_request *areq);
int sun4i_hash_update(struct ahash_request *areq);
int sun4i_hash_final(struct ahash_request *areq);
int sun4i_hash_finup(struct ahash_request *areq);
int sun4i_hash_digest(struct ahash_request *areq);
int sun4i_hash_export_md5(struct ahash_request *areq, void *out);
int sun4i_hash_import_md5(struct ahash_request *areq, const void *in);
int sun4i_hash_export_sha1(struct ahash_request *areq, void *out);
int sun4i_hash_import_sha1(struct ahash_request *areq, const void *in);
int sun4i_ss_cbc_aes_encrypt(struct skcipher_request *areq);
int sun4i_ss_cbc_aes_decrypt(struct skcipher_request *areq);
int sun4i_ss_ecb_aes_encrypt(struct skcipher_request *areq);
int sun4i_ss_ecb_aes_decrypt(struct skcipher_request *areq);
int sun4i_ss_cbc_des_encrypt(struct skcipher_request *areq);
int sun4i_ss_cbc_des_decrypt(struct skcipher_request *areq);
int sun4i_ss_ecb_des_encrypt(struct skcipher_request *areq);
int sun4i_ss_ecb_des_decrypt(struct skcipher_request *areq);
int sun4i_ss_cbc_des3_encrypt(struct skcipher_request *areq);
int sun4i_ss_cbc_des3_decrypt(struct skcipher_request *areq);
int sun4i_ss_ecb_des3_encrypt(struct skcipher_request *areq);
int sun4i_ss_ecb_des3_decrypt(struct skcipher_request *areq);
int sun4i_ss_cipher_init(struct crypto_tfm *tfm);
void sun4i_ss_cipher_exit(struct crypto_tfm *tfm);
int sun4i_ss_aes_setkey(struct crypto_skcipher *tfm, const u8 *key,
unsigned int keylen);
int sun4i_ss_des_setkey(struct crypto_skcipher *tfm, const u8 *key,
unsigned int keylen);
int sun4i_ss_des3_setkey(struct crypto_skcipher *tfm, const u8 *key,
unsigned int keylen);
int sun4i_ss_prng_generate(struct crypto_rng *tfm, const u8 *src,
unsigned int slen, u8 *dst, unsigned int dlen);
int sun4i_ss_prng_seed(struct crypto_rng *tfm, const u8 *seed, unsigned int slen);