1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * sun4i-ss.h - hardware cryptographic accelerator for Allwinner A20 SoC 4 * 5 * Copyright (C) 2013-2015 Corentin LABBE <clabbe.montjoie@gmail.com> 6 * 7 * Support AES cipher with 128,192,256 bits keysize. 8 * Support MD5 and SHA1 hash algorithms. 9 * Support DES and 3DES 10 * 11 * You could find the datasheet in Documentation/arch/arm/sunxi.rst 12 */ 13 14 #include <linux/clk.h> 15 #include <linux/crypto.h> 16 #include <linux/io.h> 17 #include <linux/module.h> 18 #include <linux/of.h> 19 #include <linux/platform_device.h> 20 #include <linux/reset.h> 21 #include <crypto/scatterwalk.h> 22 #include <linux/scatterlist.h> 23 #include <linux/interrupt.h> 24 #include <linux/delay.h> 25 #include <linux/pm_runtime.h> 26 #include <crypto/md5.h> 27 #include <crypto/skcipher.h> 28 #include <crypto/sha1.h> 29 #include <crypto/hash.h> 30 #include <crypto/internal/hash.h> 31 #include <crypto/internal/skcipher.h> 32 #include <crypto/aes.h> 33 #include <crypto/internal/des.h> 34 35 #define SS_CTL 0x00 36 #define SS_KEY0 0x04 37 #define SS_KEY1 0x08 38 #define SS_KEY2 0x0C 39 #define SS_KEY3 0x10 40 #define SS_KEY4 0x14 41 #define SS_KEY5 0x18 42 #define SS_KEY6 0x1C 43 #define SS_KEY7 0x20 44 45 #define SS_IV0 0x24 46 #define SS_IV1 0x28 47 #define SS_IV2 0x2C 48 #define SS_IV3 0x30 49 50 #define SS_FCSR 0x44 51 52 #define SS_MD0 0x4C 53 #define SS_MD1 0x50 54 #define SS_MD2 0x54 55 #define SS_MD3 0x58 56 #define SS_MD4 0x5C 57 58 #define SS_RXFIFO 0x200 59 #define SS_TXFIFO 0x204 60 61 /* SS_CTL configuration values */ 62 63 /* IV mode for hash */ 64 #define SS_IV_ARBITRARY (1 << 14) 65 66 /* SS operation mode - bits 12-13 */ 67 #define SS_ECB (0 << 12) 68 #define SS_CBC (1 << 12) 69 #define SS_CTS (3 << 12) 70 71 /* Counter width for CNT mode - bits 10-11 */ 72 #define SS_CNT_16BITS (0 << 10) 73 #define SS_CNT_32BITS (1 << 10) 74 #define SS_CNT_64BITS (2 << 10) 75 76 /* Key size for AES - bits 8-9 */ 77 #define SS_AES_128BITS (0 << 8) 78 #define SS_AES_192BITS (1 << 8) 79 #define SS_AES_256BITS (2 << 8) 80 81 /* Operation direction - bit 7 */ 82 #define SS_ENCRYPTION (0 << 7) 83 #define SS_DECRYPTION (1 << 7) 84 85 /* SS Method - bits 4-6 */ 86 #define SS_OP_AES (0 << 4) 87 #define SS_OP_DES (1 << 4) 88 #define SS_OP_3DES (2 << 4) 89 #define SS_OP_SHA1 (3 << 4) 90 #define SS_OP_MD5 (4 << 4) 91 92 /* Data end bit - bit 2 */ 93 #define SS_DATA_END (1 << 2) 94 95 /* SS Enable bit - bit 0 */ 96 #define SS_DISABLED (0 << 0) 97 #define SS_ENABLED (1 << 0) 98 99 /* SS_FCSR configuration values */ 100 /* RX FIFO status - bit 30 */ 101 #define SS_RXFIFO_FREE (1 << 30) 102 103 /* RX FIFO empty spaces - bits 24-29 */ 104 #define SS_RXFIFO_SPACES(val) (((val) >> 24) & 0x3f) 105 106 /* TX FIFO status - bit 22 */ 107 #define SS_TXFIFO_AVAILABLE (1 << 22) 108 109 /* TX FIFO available spaces - bits 16-21 */ 110 #define SS_TXFIFO_SPACES(val) (((val) >> 16) & 0x3f) 111 112 #define SS_RX_MAX 32 113 #define SS_RX_DEFAULT SS_RX_MAX 114 #define SS_TX_MAX 33 115 116 #define SS_RXFIFO_EMP_INT_PENDING (1 << 10) 117 #define SS_TXFIFO_AVA_INT_PENDING (1 << 8) 118 #define SS_RXFIFO_EMP_INT_ENABLE (1 << 2) 119 #define SS_TXFIFO_AVA_INT_ENABLE (1 << 0) 120 121 /* 122 * struct ss_variant - Describe SS hardware variant 123 * @sha1_in_be: The SHA1 digest is given by SS in BE, and so need to be inverted. 124 */ 125 struct ss_variant { 126 bool sha1_in_be; 127 }; 128 129 struct sun4i_ss_ctx { 130 const struct ss_variant *variant; 131 void __iomem *base; 132 int irq; 133 struct clk *busclk; 134 struct clk *ssclk; 135 struct reset_control *reset; 136 struct device *dev; 137 struct resource *res; 138 char buf[4 * SS_RX_MAX];/* buffer for linearize SG src */ 139 char bufo[4 * SS_TX_MAX]; /* buffer for linearize SG dst */ 140 spinlock_t slock; /* control the use of the device */ 141 struct dentry *dbgfs_dir; 142 struct dentry *dbgfs_stats; 143 }; 144 145 struct sun4i_ss_alg_template { 146 u32 type; 147 u32 mode; 148 union { 149 struct skcipher_alg crypto; 150 struct ahash_alg hash; 151 } alg; 152 struct sun4i_ss_ctx *ss; 153 unsigned long stat_req; 154 unsigned long stat_fb; 155 unsigned long stat_bytes; 156 unsigned long stat_opti; 157 }; 158 159 struct sun4i_tfm_ctx { 160 u32 key[AES_MAX_KEY_SIZE / 4];/* divided by sizeof(u32) */ 161 u32 keylen; 162 u32 keymode; 163 struct sun4i_ss_ctx *ss; 164 struct crypto_skcipher *fallback_tfm; 165 }; 166 167 struct sun4i_cipher_req_ctx { 168 u32 mode; 169 u8 backup_iv[AES_BLOCK_SIZE]; 170 struct skcipher_request fallback_req; // keep at the end 171 }; 172 173 struct sun4i_req_ctx { 174 u32 mode; 175 u64 byte_count; /* number of bytes "uploaded" to the device */ 176 u32 hash[5]; /* for storing SS_IVx register */ 177 char buf[64]; 178 unsigned int len; 179 int flags; 180 }; 181 182 int sun4i_hash_crainit(struct crypto_tfm *tfm); 183 void sun4i_hash_craexit(struct crypto_tfm *tfm); 184 int sun4i_hash_init(struct ahash_request *areq); 185 int sun4i_hash_update(struct ahash_request *areq); 186 int sun4i_hash_final(struct ahash_request *areq); 187 int sun4i_hash_finup(struct ahash_request *areq); 188 int sun4i_hash_digest(struct ahash_request *areq); 189 int sun4i_hash_export_md5(struct ahash_request *areq, void *out); 190 int sun4i_hash_import_md5(struct ahash_request *areq, const void *in); 191 int sun4i_hash_export_sha1(struct ahash_request *areq, void *out); 192 int sun4i_hash_import_sha1(struct ahash_request *areq, const void *in); 193 194 int sun4i_ss_cbc_aes_encrypt(struct skcipher_request *areq); 195 int sun4i_ss_cbc_aes_decrypt(struct skcipher_request *areq); 196 int sun4i_ss_ecb_aes_encrypt(struct skcipher_request *areq); 197 int sun4i_ss_ecb_aes_decrypt(struct skcipher_request *areq); 198 199 int sun4i_ss_cbc_des_encrypt(struct skcipher_request *areq); 200 int sun4i_ss_cbc_des_decrypt(struct skcipher_request *areq); 201 int sun4i_ss_ecb_des_encrypt(struct skcipher_request *areq); 202 int sun4i_ss_ecb_des_decrypt(struct skcipher_request *areq); 203 204 int sun4i_ss_cbc_des3_encrypt(struct skcipher_request *areq); 205 int sun4i_ss_cbc_des3_decrypt(struct skcipher_request *areq); 206 int sun4i_ss_ecb_des3_encrypt(struct skcipher_request *areq); 207 int sun4i_ss_ecb_des3_decrypt(struct skcipher_request *areq); 208 209 int sun4i_ss_cipher_init(struct crypto_tfm *tfm); 210 void sun4i_ss_cipher_exit(struct crypto_tfm *tfm); 211 int sun4i_ss_aes_setkey(struct crypto_skcipher *tfm, const u8 *key, 212 unsigned int keylen); 213 int sun4i_ss_des_setkey(struct crypto_skcipher *tfm, const u8 *key, 214 unsigned int keylen); 215 int sun4i_ss_des3_setkey(struct crypto_skcipher *tfm, const u8 *key, 216 unsigned int keylen); 217