1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * sun8i-ss.h - hardware cryptographic offloader for 4 * Allwinner A80/A83T SoC 5 * 6 * Copyright (C) 2016-2019 Corentin LABBE <clabbe.montjoie@gmail.com> 7 */ 8 #include <crypto/aes.h> 9 #include <crypto/des.h> 10 #include <crypto/engine.h> 11 #include <crypto/skcipher.h> 12 #include <linux/atomic.h> 13 #include <linux/debugfs.h> 14 #include <linux/crypto.h> 15 16 #define SS_ENCRYPTION 0 17 #define SS_DECRYPTION BIT(6) 18 19 #define SS_ALG_AES 0 20 #define SS_ALG_DES (1 << 2) 21 #define SS_ALG_3DES (2 << 2) 22 23 #define SS_CTL_REG 0x00 24 #define SS_INT_CTL_REG 0x04 25 #define SS_INT_STA_REG 0x08 26 #define SS_KEY_ADR_REG 0x10 27 #define SS_IV_ADR_REG 0x18 28 #define SS_SRC_ADR_REG 0x20 29 #define SS_DST_ADR_REG 0x28 30 #define SS_LEN_ADR_REG 0x30 31 32 #define SS_ID_NOTSUPP 0xFF 33 34 #define SS_ID_CIPHER_AES 0 35 #define SS_ID_CIPHER_DES 1 36 #define SS_ID_CIPHER_DES3 2 37 #define SS_ID_CIPHER_MAX 3 38 39 #define SS_ID_OP_ECB 0 40 #define SS_ID_OP_CBC 1 41 #define SS_ID_OP_MAX 2 42 43 #define SS_AES_128BITS 0 44 #define SS_AES_192BITS 1 45 #define SS_AES_256BITS 2 46 47 #define SS_OP_ECB 0 48 #define SS_OP_CBC (1 << 13) 49 50 #define SS_FLOW0 BIT(30) 51 #define SS_FLOW1 BIT(31) 52 53 #define MAX_SG 8 54 55 #define MAXFLOW 2 56 57 #define SS_MAX_CLOCKS 2 58 59 #define SS_DIE_ID_SHIFT 20 60 #define SS_DIE_ID_MASK 0x07 61 62 /* 63 * struct ss_clock - Describe clocks used by sun8i-ss 64 * @name: Name of clock needed by this variant 65 * @freq: Frequency to set for each clock 66 * @max_freq: Maximum frequency for each clock 67 */ 68 struct ss_clock { 69 const char *name; 70 unsigned long freq; 71 unsigned long max_freq; 72 }; 73 74 /* 75 * struct ss_variant - Describe SS capability for each variant hardware 76 * @alg_cipher: list of supported ciphers. for each SS_ID_ this will give the 77 * coresponding SS_ALG_XXX value 78 * @op_mode: list of supported block modes 79 * @ss_clks! list of clock needed by this variant 80 */ 81 struct ss_variant { 82 char alg_cipher[SS_ID_CIPHER_MAX]; 83 u32 op_mode[SS_ID_OP_MAX]; 84 struct ss_clock ss_clks[SS_MAX_CLOCKS]; 85 }; 86 87 struct sginfo { 88 u32 addr; 89 u32 len; 90 }; 91 92 /* 93 * struct sun8i_ss_flow - Information used by each flow 94 * @engine: ptr to the crypto_engine for this flow 95 * @complete: completion for the current task on this flow 96 * @status: set to 1 by interrupt if task is done 97 * @stat_req: number of request done by this flow 98 */ 99 struct sun8i_ss_flow { 100 struct crypto_engine *engine; 101 struct completion complete; 102 int status; 103 #ifdef CONFIG_CRYPTO_DEV_SUN8I_SS_DEBUG 104 unsigned long stat_req; 105 #endif 106 }; 107 108 /* 109 * struct sun8i_ss_dev - main container for all this driver information 110 * @base: base address of SS 111 * @ssclks: clocks used by SS 112 * @reset: pointer to reset controller 113 * @dev: the platform device 114 * @mlock: Control access to device registers 115 * @flows: array of all flow 116 * @flow: flow to use in next request 117 * @variant: pointer to variant specific data 118 * @dbgfs_dir: Debugfs dentry for statistic directory 119 * @dbgfs_stats: Debugfs dentry for statistic counters 120 */ 121 struct sun8i_ss_dev { 122 void __iomem *base; 123 struct clk *ssclks[SS_MAX_CLOCKS]; 124 struct reset_control *reset; 125 struct device *dev; 126 struct mutex mlock; 127 struct sun8i_ss_flow *flows; 128 atomic_t flow; 129 const struct ss_variant *variant; 130 #ifdef CONFIG_CRYPTO_DEV_SUN8I_SS_DEBUG 131 struct dentry *dbgfs_dir; 132 struct dentry *dbgfs_stats; 133 #endif 134 }; 135 136 /* 137 * struct sun8i_cipher_req_ctx - context for a skcipher request 138 * @t_src: list of mapped SGs with their size 139 * @t_dst: list of mapped SGs with their size 140 * @p_key: DMA address of the key 141 * @p_iv: DMA address of the IV 142 * @method: current algorithm for this request 143 * @op_mode: op_mode for this request 144 * @op_dir: direction (encrypt vs decrypt) for this request 145 * @flow: the flow to use for this request 146 * @ivlen: size of biv 147 * @keylen: keylen for this request 148 * @biv: buffer which contain the IV 149 * @fallback_req: request struct for invoking the fallback skcipher TFM 150 */ 151 struct sun8i_cipher_req_ctx { 152 struct sginfo t_src[MAX_SG]; 153 struct sginfo t_dst[MAX_SG]; 154 u32 p_key; 155 u32 p_iv; 156 u32 method; 157 u32 op_mode; 158 u32 op_dir; 159 int flow; 160 unsigned int ivlen; 161 unsigned int keylen; 162 void *biv; 163 struct skcipher_request fallback_req; // keep at the end 164 }; 165 166 /* 167 * struct sun8i_cipher_tfm_ctx - context for a skcipher TFM 168 * @enginectx: crypto_engine used by this TFM 169 * @key: pointer to key data 170 * @keylen: len of the key 171 * @ss: pointer to the private data of driver handling this TFM 172 * @fallback_tfm: pointer to the fallback TFM 173 */ 174 struct sun8i_cipher_tfm_ctx { 175 struct crypto_engine_ctx enginectx; 176 u32 *key; 177 u32 keylen; 178 struct sun8i_ss_dev *ss; 179 struct crypto_skcipher *fallback_tfm; 180 }; 181 182 /* 183 * struct sun8i_ss_alg_template - crypto_alg template 184 * @type: the CRYPTO_ALG_TYPE for this template 185 * @ss_algo_id: the SS_ID for this template 186 * @ss_blockmode: the type of block operation SS_ID 187 * @ss: pointer to the sun8i_ss_dev structure associated with 188 * this template 189 * @alg: one of sub struct must be used 190 * @stat_req: number of request done on this template 191 * @stat_fb: number of request which has fallbacked 192 */ 193 struct sun8i_ss_alg_template { 194 u32 type; 195 u32 ss_algo_id; 196 u32 ss_blockmode; 197 struct sun8i_ss_dev *ss; 198 union { 199 struct skcipher_alg skcipher; 200 } alg; 201 #ifdef CONFIG_CRYPTO_DEV_SUN8I_SS_DEBUG 202 unsigned long stat_req; 203 unsigned long stat_fb; 204 #endif 205 }; 206 207 int sun8i_ss_enqueue(struct crypto_async_request *areq, u32 type); 208 209 int sun8i_ss_aes_setkey(struct crypto_skcipher *tfm, const u8 *key, 210 unsigned int keylen); 211 int sun8i_ss_des3_setkey(struct crypto_skcipher *tfm, const u8 *key, 212 unsigned int keylen); 213 int sun8i_ss_cipher_init(struct crypto_tfm *tfm); 214 void sun8i_ss_cipher_exit(struct crypto_tfm *tfm); 215 int sun8i_ss_skdecrypt(struct skcipher_request *areq); 216 int sun8i_ss_skencrypt(struct skcipher_request *areq); 217 218 int sun8i_ss_get_engine_number(struct sun8i_ss_dev *ss); 219 220 int sun8i_ss_run_task(struct sun8i_ss_dev *ss, struct sun8i_cipher_req_ctx *rctx, const char *name); 221