drivers/crypto/sunxi-ss/sun4i-ss-core.c

   1 /*
   2  * sun4i-ss-core.c - hardware cryptographic accelerator for Allwinner A20 SoC
   3  *
   4  * Copyright (C) 2013-2015 Corentin LABBE <clabbe.montjoie@gmail.com>
   5  *
   6  * Core file which registers crypto algorithms supported by the SS.
   7  *
   8  * You could find a link for the datasheet in Documentation/arm/sunxi/README
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  */
  15 #include <linux/clk.h>
  16 #include <linux/crypto.h>
  17 #include <linux/io.h>
  18 #include <linux/module.h>
  19 #include <linux/of.h>
  20 #include <linux/platform_device.h>
  21 #include <crypto/scatterwalk.h>
  22 #include <linux/scatterlist.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/delay.h>
  25 #include <linux/reset.h>
  26
  27 #include "sun4i-ss.h"
  28
  29 static struct sun4i_ss_alg_template ss_algs[] = {
  30 {       .type = CRYPTO_ALG_TYPE_AHASH,
  31         .mode = SS_OP_MD5,
  32         .alg.hash = {
  33                 .init = sun4i_hash_init,
  34                 .update = sun4i_hash_update,
  35                 .final = sun4i_hash_final,
  36                 .finup = sun4i_hash_finup,
  37                 .digest = sun4i_hash_digest,
  38                 .export = sun4i_hash_export_md5,
  39                 .import = sun4i_hash_import_md5,
  40                 .halg = {
  41                         .digestsize = MD5_DIGEST_SIZE,
  42                         .statesize = sizeof(struct md5_state),
  43                         .base = {
  44                                 .cra_name = "md5",
  45                                 .cra_driver_name = "md5-sun4i-ss",
  46                                 .cra_priority = 300,
  47                                 .cra_alignmask = 3,
  48                                 .cra_flags = CRYPTO_ALG_TYPE_AHASH,
  49                                 .cra_blocksize = MD5_HMAC_BLOCK_SIZE,
  50                                 .cra_ctxsize = sizeof(struct sun4i_req_ctx),
  51                                 .cra_module = THIS_MODULE,
  52                                 .cra_type = &crypto_ahash_type,
  53                                 .cra_init = sun4i_hash_crainit
  54                         }
  55                 }
  56         }
  57 },
  58 {       .type = CRYPTO_ALG_TYPE_AHASH,
  59         .mode = SS_OP_SHA1,
  60         .alg.hash = {
  61                 .init = sun4i_hash_init,
  62                 .update = sun4i_hash_update,
  63                 .final = sun4i_hash_final,
  64                 .finup = sun4i_hash_finup,
  65                 .digest = sun4i_hash_digest,
  66                 .export = sun4i_hash_export_sha1,
  67                 .import = sun4i_hash_import_sha1,
  68                 .halg = {
  69                         .digestsize = SHA1_DIGEST_SIZE,
  70                         .statesize = sizeof(struct sha1_state),
  71                         .base = {
  72                                 .cra_name = "sha1",
  73                                 .cra_driver_name = "sha1-sun4i-ss",
  74                                 .cra_priority = 300,
  75                                 .cra_alignmask = 3,
  76                                 .cra_flags = CRYPTO_ALG_TYPE_AHASH,
  77                                 .cra_blocksize = SHA1_BLOCK_SIZE,
  78                                 .cra_ctxsize = sizeof(struct sun4i_req_ctx),
  79                                 .cra_module = THIS_MODULE,
  80                                 .cra_type = &crypto_ahash_type,
  81                                 .cra_init = sun4i_hash_crainit
  82                         }
  83                 }
  84         }
  85 },
  86 {       .type = CRYPTO_ALG_TYPE_ABLKCIPHER,
  87         .alg.crypto = {
  88                 .cra_name = "cbc(aes)",
  89                 .cra_driver_name = "cbc-aes-sun4i-ss",
  90                 .cra_priority = 300,
  91                 .cra_blocksize = AES_BLOCK_SIZE,
  92                 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER,
  93                 .cra_ctxsize = sizeof(struct sun4i_tfm_ctx),
  94                 .cra_module = THIS_MODULE,
  95                 .cra_alignmask = 3,
  96                 .cra_type = &crypto_ablkcipher_type,
  97                 .cra_init = sun4i_ss_cipher_init,
  98                 .cra_ablkcipher = {
  99                         .min_keysize    = AES_MIN_KEY_SIZE,
 100                         .max_keysize    = AES_MAX_KEY_SIZE,
 101                         .ivsize         = AES_BLOCK_SIZE,
 102                         .setkey         = sun4i_ss_aes_setkey,
 103                         .encrypt        = sun4i_ss_cbc_aes_encrypt,
 104                         .decrypt        = sun4i_ss_cbc_aes_decrypt,
 105                 }
 106         }
 107 },
 108 {       .type = CRYPTO_ALG_TYPE_ABLKCIPHER,
 109         .alg.crypto = {
 110                 .cra_name = "ecb(aes)",
 111                 .cra_driver_name = "ecb-aes-sun4i-ss",
 112                 .cra_priority = 300,
 113                 .cra_blocksize = AES_BLOCK_SIZE,
 114                 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER,
 115                 .cra_ctxsize = sizeof(struct sun4i_tfm_ctx),
 116                 .cra_module = THIS_MODULE,
 117                 .cra_alignmask = 3,
 118                 .cra_type = &crypto_ablkcipher_type,
 119                 .cra_init = sun4i_ss_cipher_init,
 120                 .cra_ablkcipher = {
 121                         .min_keysize    = AES_MIN_KEY_SIZE,
 122                         .max_keysize    = AES_MAX_KEY_SIZE,
 123                         .ivsize         = AES_BLOCK_SIZE,
 124                         .setkey         = sun4i_ss_aes_setkey,
 125                         .encrypt        = sun4i_ss_ecb_aes_encrypt,
 126                         .decrypt        = sun4i_ss_ecb_aes_decrypt,
 127                 }
 128         }
 129 },
 130 {       .type = CRYPTO_ALG_TYPE_ABLKCIPHER,
 131         .alg.crypto = {
 132                 .cra_name = "cbc(des)",
 133                 .cra_driver_name = "cbc-des-sun4i-ss",
 134                 .cra_priority = 300,
 135                 .cra_blocksize = DES_BLOCK_SIZE,
 136                 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER,
 137                 .cra_ctxsize = sizeof(struct sun4i_req_ctx),
 138                 .cra_module = THIS_MODULE,
 139                 .cra_alignmask = 3,
 140                 .cra_type = &crypto_ablkcipher_type,
 141                 .cra_init = sun4i_ss_cipher_init,
 142                 .cra_u.ablkcipher = {
 143                         .min_keysize    = DES_KEY_SIZE,
 144                         .max_keysize    = DES_KEY_SIZE,
 145                         .ivsize         = DES_BLOCK_SIZE,
 146                         .setkey         = sun4i_ss_des_setkey,
 147                         .encrypt        = sun4i_ss_cbc_des_encrypt,
 148                         .decrypt        = sun4i_ss_cbc_des_decrypt,
 149                 }
 150         }
 151 },
 152 {       .type = CRYPTO_ALG_TYPE_ABLKCIPHER,
 153         .alg.crypto = {
 154                 .cra_name = "ecb(des)",
 155                 .cra_driver_name = "ecb-des-sun4i-ss",
 156                 .cra_priority = 300,
 157                 .cra_blocksize = DES_BLOCK_SIZE,
 158                 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER,
 159                 .cra_ctxsize = sizeof(struct sun4i_req_ctx),
 160                 .cra_module = THIS_MODULE,
 161                 .cra_alignmask = 3,
 162                 .cra_type = &crypto_ablkcipher_type,
 163                 .cra_init = sun4i_ss_cipher_init,
 164                 .cra_u.ablkcipher = {
 165                         .min_keysize    = DES_KEY_SIZE,
 166                         .max_keysize    = DES_KEY_SIZE,
 167                         .setkey         = sun4i_ss_des_setkey,
 168                         .encrypt        = sun4i_ss_ecb_des_encrypt,
 169                         .decrypt        = sun4i_ss_ecb_des_decrypt,
 170                 }
 171         }
 172 },
 173 {       .type = CRYPTO_ALG_TYPE_ABLKCIPHER,
 174         .alg.crypto = {
 175                 .cra_name = "cbc(des3_ede)",
 176                 .cra_driver_name = "cbc-des3-sun4i-ss",
 177                 .cra_priority = 300,
 178                 .cra_blocksize = DES3_EDE_BLOCK_SIZE,
 179                 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER,
 180                 .cra_ctxsize = sizeof(struct sun4i_req_ctx),
 181                 .cra_module = THIS_MODULE,
 182                 .cra_alignmask = 3,
 183                 .cra_type = &crypto_ablkcipher_type,
 184                 .cra_init = sun4i_ss_cipher_init,
 185                 .cra_u.ablkcipher = {
 186                         .min_keysize    = DES3_EDE_KEY_SIZE,
 187                         .max_keysize    = DES3_EDE_KEY_SIZE,
 188                         .ivsize         = DES3_EDE_BLOCK_SIZE,
 189                         .setkey         = sun4i_ss_des3_setkey,
 190                         .encrypt        = sun4i_ss_cbc_des3_encrypt,
 191                         .decrypt        = sun4i_ss_cbc_des3_decrypt,
 192                 }
 193         }
 194 },
 195 {       .type = CRYPTO_ALG_TYPE_ABLKCIPHER,
 196         .alg.crypto = {
 197                 .cra_name = "ecb(des3_ede)",
 198                 .cra_driver_name = "ecb-des3-sun4i-ss",
 199                 .cra_priority = 300,
 200                 .cra_blocksize = DES3_EDE_BLOCK_SIZE,
 201                 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER,
 202                 .cra_ctxsize = sizeof(struct sun4i_req_ctx),
 203                 .cra_module = THIS_MODULE,
 204                 .cra_alignmask = 3,
 205                 .cra_type = &crypto_ablkcipher_type,
 206                 .cra_init = sun4i_ss_cipher_init,
 207                 .cra_u.ablkcipher = {
 208                         .min_keysize    = DES3_EDE_KEY_SIZE,
 209                         .max_keysize    = DES3_EDE_KEY_SIZE,
 210                         .ivsize         = DES3_EDE_BLOCK_SIZE,
 211                         .setkey         = sun4i_ss_des3_setkey,
 212                         .encrypt        = sun4i_ss_ecb_des3_encrypt,
 213                         .decrypt        = sun4i_ss_ecb_des3_decrypt,
 214                 }
 215         }
 216 },
 217 };
 218
 219 static int sun4i_ss_probe(struct platform_device *pdev)
 220 {
 221         struct resource *res;
 222         u32 v;
 223         int err, i;
 224         unsigned long cr;
 225         const unsigned long cr_ahb = 24 * 1000 * 1000;
 226         const unsigned long cr_mod = 150 * 1000 * 1000;
 227         struct sun4i_ss_ctx *ss;
 228
 229         if (!pdev->dev.of_node)
 230                 return -ENODEV;
 231
 232         ss = devm_kzalloc(&pdev->dev, sizeof(*ss), GFP_KERNEL);
 233         if (!ss)
 234                 return -ENOMEM;
 235
 236         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 237         ss->base = devm_ioremap_resource(&pdev->dev, res);
 238         if (IS_ERR(ss->base)) {
 239                 dev_err(&pdev->dev, "Cannot request MMIO\n");
 240                 return PTR_ERR(ss->base);
 241         }
 242
 243         ss->ssclk = devm_clk_get(&pdev->dev, "mod");
 244         if (IS_ERR(ss->ssclk)) {
 245                 err = PTR_ERR(ss->ssclk);
 246                 dev_err(&pdev->dev, "Cannot get SS clock err=%d\n", err);
 247                 return err;
 248         }
 249         dev_dbg(&pdev->dev, "clock ss acquired\n");
 250
 251         ss->busclk = devm_clk_get(&pdev->dev, "ahb");
 252         if (IS_ERR(ss->busclk)) {
 253                 err = PTR_ERR(ss->busclk);
 254                 dev_err(&pdev->dev, "Cannot get AHB SS clock err=%d\n", err);
 255                 return err;
 256         }
 257         dev_dbg(&pdev->dev, "clock ahb_ss acquired\n");
 258
 259         ss->reset = devm_reset_control_get_optional(&pdev->dev, "ahb");
 260         if (IS_ERR(ss->reset)) {
 261                 if (PTR_ERR(ss->reset) == -EPROBE_DEFER)
 262                         return PTR_ERR(ss->reset);
 263                 dev_info(&pdev->dev, "no reset control found\n");
 264                 ss->reset = NULL;
 265         }
 266
 267         /* Enable both clocks */
 268         err = clk_prepare_enable(ss->busclk);
 269         if (err != 0) {
 270                 dev_err(&pdev->dev, "Cannot prepare_enable busclk\n");
 271                 return err;
 272         }
 273         err = clk_prepare_enable(ss->ssclk);
 274         if (err != 0) {
 275                 dev_err(&pdev->dev, "Cannot prepare_enable ssclk\n");
 276                 goto error_ssclk;
 277         }
 278
 279         /*
 280          * Check that clock have the correct rates given in the datasheet
 281          * Try to set the clock to the maximum allowed
 282          */
 283         err = clk_set_rate(ss->ssclk, cr_mod);
 284         if (err != 0) {
 285                 dev_err(&pdev->dev, "Cannot set clock rate to ssclk\n");
 286                 goto error_clk;
 287         }
 288
 289         /* Deassert reset if we have a reset control */
 290         if (ss->reset) {
 291                 err = reset_control_deassert(ss->reset);
 292                 if (err) {
 293                         dev_err(&pdev->dev, "Cannot deassert reset control\n");
 294                         goto error_clk;
 295                 }
 296         }
 297
 298         /*
 299          * The only impact on clocks below requirement are bad performance,
 300          * so do not print "errors"
 301          * warn on Overclocked clocks
 302          */
 303         cr = clk_get_rate(ss->busclk);
 304         if (cr >= cr_ahb)
 305                 dev_dbg(&pdev->dev, "Clock bus %lu (%lu MHz) (must be >= %lu)\n",
 306                         cr, cr / 1000000, cr_ahb);
 307         else
 308                 dev_warn(&pdev->dev, "Clock bus %lu (%lu MHz) (must be >= %lu)\n",
 309                          cr, cr / 1000000, cr_ahb);
 310
 311         cr = clk_get_rate(ss->ssclk);
 312         if (cr <= cr_mod)
 313                 if (cr < cr_mod)
 314                         dev_warn(&pdev->dev, "Clock ss %lu (%lu MHz) (must be <= %lu)\n",
 315                                  cr, cr / 1000000, cr_mod);
 316                 else
 317                         dev_dbg(&pdev->dev, "Clock ss %lu (%lu MHz) (must be <= %lu)\n",
 318                                 cr, cr / 1000000, cr_mod);
 319         else
 320                 dev_warn(&pdev->dev, "Clock ss is at %lu (%lu MHz) (must be <= %lu)\n",
 321                          cr, cr / 1000000, cr_mod);
 322
 323         /*
 324          * Datasheet named it "Die Bonding ID"
 325          * I expect to be a sort of Security System Revision number.
 326          * Since the A80 seems to have an other version of SS
 327          * this info could be useful
 328          */
 329         writel(SS_ENABLED, ss->base + SS_CTL);
 330         v = readl(ss->base + SS_CTL);
 331         v >>= 16;
 332         v &= 0x07;
 333         dev_info(&pdev->dev, "Die ID %d\n", v);
 334         writel(0, ss->base + SS_CTL);
 335
 336         ss->dev = &pdev->dev;
 337
 338         spin_lock_init(&ss->slock);
 339
 340         for (i = 0; i < ARRAY_SIZE(ss_algs); i++) {
 341                 ss_algs[i].ss = ss;
 342                 switch (ss_algs[i].type) {
 343                 case CRYPTO_ALG_TYPE_ABLKCIPHER:
 344                         err = crypto_register_alg(&ss_algs[i].alg.crypto);
 345                         if (err != 0) {
 346                                 dev_err(ss->dev, "Fail to register %s\n",
 347                                         ss_algs[i].alg.crypto.cra_name);
 348                                 goto error_alg;
 349                         }
 350                         break;
 351                 case CRYPTO_ALG_TYPE_AHASH:
 352                         err = crypto_register_ahash(&ss_algs[i].alg.hash);
 353                         if (err != 0) {
 354                                 dev_err(ss->dev, "Fail to register %s\n",
 355                                         ss_algs[i].alg.hash.halg.base.cra_name);
 356                                 goto error_alg;
 357                         }
 358                         break;
 359                 }
 360         }
 361         platform_set_drvdata(pdev, ss);
 362         return 0;
 363 error_alg:
 364         i--;
 365         for (; i >= 0; i--) {
 366                 switch (ss_algs[i].type) {
 367                 case CRYPTO_ALG_TYPE_ABLKCIPHER:
 368                         crypto_unregister_alg(&ss_algs[i].alg.crypto);
 369                         break;
 370                 case CRYPTO_ALG_TYPE_AHASH:
 371                         crypto_unregister_ahash(&ss_algs[i].alg.hash);
 372                         break;
 373                 }
 374         }
 375         if (ss->reset)
 376                 reset_control_assert(ss->reset);
 377 error_clk:
 378         clk_disable_unprepare(ss->ssclk);
 379 error_ssclk:
 380         clk_disable_unprepare(ss->busclk);
 381         return err;
 382 }
 383
 384 static int sun4i_ss_remove(struct platform_device *pdev)
 385 {
 386         int i;
 387         struct sun4i_ss_ctx *ss = platform_get_drvdata(pdev);
 388
 389         for (i = 0; i < ARRAY_SIZE(ss_algs); i++) {
 390                 switch (ss_algs[i].type) {
 391                 case CRYPTO_ALG_TYPE_ABLKCIPHER:
 392                         crypto_unregister_alg(&ss_algs[i].alg.crypto);
 393                         break;
 394                 case CRYPTO_ALG_TYPE_AHASH:
 395                         crypto_unregister_ahash(&ss_algs[i].alg.hash);
 396                         break;
 397                 }
 398         }
 399
 400         writel(0, ss->base + SS_CTL);
 401         if (ss->reset)
 402                 reset_control_assert(ss->reset);
 403         clk_disable_unprepare(ss->busclk);
 404         clk_disable_unprepare(ss->ssclk);
 405         return 0;
 406 }
 407
 408 static const struct of_device_id a20ss_crypto_of_match_table[] = {
 409         { .compatible = "allwinner,sun4i-a10-crypto" },
 410         {}
 411 };
 412 MODULE_DEVICE_TABLE(of, a20ss_crypto_of_match_table);
 413
 414 static struct platform_driver sun4i_ss_driver = {
 415         .probe          = sun4i_ss_probe,
 416         .remove         = sun4i_ss_remove,
 417         .driver         = {
 418                 .name           = "sun4i-ss",
 419                 .of_match_table = a20ss_crypto_of_match_table,
 420         },
 421 };
 422
 423 module_platform_driver(sun4i_ss_driver);
 424
 425 MODULE_DESCRIPTION("Allwinner Security System cryptographic accelerator");
 426 MODULE_LICENSE("GPL");
 427 MODULE_AUTHOR("Corentin LABBE <clabbe.montjoie@gmail.com>");