drivers/crypto/mv_cesa.c

   1 /*
   2  * Support for Marvell's crypto engine which can be found on some Orion5X
   3  * boards.
   4  *
   5  * Author: Sebastian Andrzej Siewior < sebastian at breakpoint dot cc >
   6  * License: GPLv2
   7  *
   8  */
   9 #include <crypto/aes.h>
  10 #include <crypto/algapi.h>
  11 #include <linux/crypto.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/io.h>
  14 #include <linux/kthread.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/scatterlist.h>
  17 #include <linux/slab.h>
  18 #include <linux/module.h>
  19 #include <linux/clk.h>
  20 #include <crypto/internal/hash.h>
  21 #include <crypto/sha.h>
  22 #include <linux/of.h>
  23 #include <linux/of_platform.h>
  24 #include <linux/of_irq.h>
  25
  26 #include "mv_cesa.h"
  27
  28 #define MV_CESA "MV-CESA:"
  29 #define MAX_HW_HASH_SIZE        0xFFFF
  30 #define MV_CESA_EXPIRE          500 /* msec */
  31
  32 /*
  33  * STM:
  34  *   /---------------------------------------\
  35  *   |                                       | request complete
  36  *  \./                                      |
  37  * IDLE -> new request -> BUSY -> done -> DEQUEUE
  38  *                         /°\               |
  39  *                          |                | more scatter entries
  40  *                          \________________/
  41  */
  42 enum engine_status {
  43         ENGINE_IDLE,
  44         ENGINE_BUSY,
  45         ENGINE_W_DEQUEUE,
  46 };
  47
  48 /**
  49  * struct req_progress - used for every crypt request
  50  * @src_sg_it:          sg iterator for src
  51  * @dst_sg_it:          sg iterator for dst
  52  * @sg_src_left:        bytes left in src to process (scatter list)
  53  * @src_start:          offset to add to src start position (scatter list)
  54  * @crypt_len:          length of current hw crypt/hash process
  55  * @hw_nbytes:          total bytes to process in hw for this request
  56  * @copy_back:          whether to copy data back (crypt) or not (hash)
  57  * @sg_dst_left:        bytes left dst to process in this scatter list
  58  * @dst_start:          offset to add to dst start position (scatter list)
  59  * @hw_processed_bytes: number of bytes processed by hw (request).
  60  *
  61  * sg helper are used to iterate over the scatterlist. Since the size of the
  62  * SRAM may be less than the scatter size, this struct struct is used to keep
  63  * track of progress within current scatterlist.
  64  */
  65 struct req_progress {
  66         struct sg_mapping_iter src_sg_it;
  67         struct sg_mapping_iter dst_sg_it;
  68         void (*complete) (void);
  69         void (*process) (int is_first);
  70
  71         /* src mostly */
  72         int sg_src_left;
  73         int src_start;
  74         int crypt_len;
  75         int hw_nbytes;
  76         /* dst mostly */
  77         int copy_back;
  78         int sg_dst_left;
  79         int dst_start;
  80         int hw_processed_bytes;
  81 };
  82
  83 struct crypto_priv {
  84         void __iomem *reg;
  85         void __iomem *sram;
  86         int irq;
  87         struct clk *clk;
  88         struct task_struct *queue_th;
  89
  90         /* the lock protects queue and eng_st */
  91         spinlock_t lock;
  92         struct crypto_queue queue;
  93         enum engine_status eng_st;
  94         struct timer_list completion_timer;
  95         struct crypto_async_request *cur_req;
  96         struct req_progress p;
  97         int max_req_size;
  98         int sram_size;
  99         int has_sha1;
 100         int has_hmac_sha1;
 101 };
 102
 103 static struct crypto_priv *cpg;
 104
 105 struct mv_ctx {
 106         u8 aes_enc_key[AES_KEY_LEN];
 107         u32 aes_dec_key[8];
 108         int key_len;
 109         u32 need_calc_aes_dkey;
 110 };
 111
 112 enum crypto_op {
 113         COP_AES_ECB,
 114         COP_AES_CBC,
 115 };
 116
 117 struct mv_req_ctx {
 118         enum crypto_op op;
 119         int decrypt;
 120 };
 121
 122 enum hash_op {
 123         COP_SHA1,
 124         COP_HMAC_SHA1
 125 };
 126
 127 struct mv_tfm_hash_ctx {
 128         struct crypto_shash *fallback;
 129         struct crypto_shash *base_hash;
 130         u32 ivs[2 * SHA1_DIGEST_SIZE / 4];
 131         int count_add;
 132         enum hash_op op;
 133 };
 134
 135 struct mv_req_hash_ctx {
 136         u64 count;
 137         u32 state[SHA1_DIGEST_SIZE / 4];
 138         u8 buffer[SHA1_BLOCK_SIZE];
 139         int first_hash;         /* marks that we don't have previous state */
 140         int last_chunk;         /* marks that this is the 'final' request */
 141         int extra_bytes;        /* unprocessed bytes in buffer */
 142         enum hash_op op;
 143         int count_add;
 144 };
 145
 146 static void mv_completion_timer_callback(unsigned long unused)
 147 {
 148         int active = readl(cpg->reg + SEC_ACCEL_CMD) & SEC_CMD_EN_SEC_ACCL0;
 149
 150         printk(KERN_ERR MV_CESA
 151                "completion timer expired (CESA %sactive), cleaning up.\n",
 152                active ? "" : "in");
 153
 154         del_timer(&cpg->completion_timer);
 155         writel(SEC_CMD_DISABLE_SEC, cpg->reg + SEC_ACCEL_CMD);
 156         while(readl(cpg->reg + SEC_ACCEL_CMD) & SEC_CMD_DISABLE_SEC)
 157                 printk(KERN_INFO MV_CESA "%s: waiting for engine finishing\n", __func__);
 158         cpg->eng_st = ENGINE_W_DEQUEUE;
 159         wake_up_process(cpg->queue_th);
 160 }
 161
 162 static void mv_setup_timer(void)
 163 {
 164         setup_timer(&cpg->completion_timer, &mv_completion_timer_callback, 0);
 165         mod_timer(&cpg->completion_timer,
 166                         jiffies + msecs_to_jiffies(MV_CESA_EXPIRE));
 167 }
 168
 169 static void compute_aes_dec_key(struct mv_ctx *ctx)
 170 {
 171         struct crypto_aes_ctx gen_aes_key;
 172         int key_pos;
 173
 174         if (!ctx->need_calc_aes_dkey)
 175                 return;
 176
 177         crypto_aes_expand_key(&gen_aes_key, ctx->aes_enc_key, ctx->key_len);
 178
 179         key_pos = ctx->key_len + 24;
 180         memcpy(ctx->aes_dec_key, &gen_aes_key.key_enc[key_pos], 4 * 4);
 181         switch (ctx->key_len) {
 182         case AES_KEYSIZE_256:
 183                 key_pos -= 2;
 184                 /* fall */
 185         case AES_KEYSIZE_192:
 186                 key_pos -= 2;
 187                 memcpy(&ctx->aes_dec_key[4], &gen_aes_key.key_enc[key_pos],
 188                                 4 * 4);
 189                 break;
 190         }
 191         ctx->need_calc_aes_dkey = 0;
 192 }
 193
 194 static int mv_setkey_aes(struct crypto_ablkcipher *cipher, const u8 *key,
 195                 unsigned int len)
 196 {
 197         struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
 198         struct mv_ctx *ctx = crypto_tfm_ctx(tfm);
 199
 200         switch (len) {
 201         case AES_KEYSIZE_128:
 202         case AES_KEYSIZE_192:
 203         case AES_KEYSIZE_256:
 204                 break;
 205         default:
 206                 crypto_ablkcipher_set_flags(cipher, CRYPTO_TFM_RES_BAD_KEY_LEN);
 207                 return -EINVAL;
 208         }
 209         ctx->key_len = len;
 210         ctx->need_calc_aes_dkey = 1;
 211
 212         memcpy(ctx->aes_enc_key, key, AES_KEY_LEN);
 213         return 0;
 214 }
 215
 216 static void copy_src_to_buf(struct req_progress *p, char *dbuf, int len)
 217 {
 218         int ret;
 219         void *sbuf;
 220         int copy_len;
 221
 222         while (len) {
 223                 if (!p->sg_src_left) {
 224                         ret = sg_miter_next(&p->src_sg_it);
 225                         BUG_ON(!ret);
 226                         p->sg_src_left = p->src_sg_it.length;
 227                         p->src_start = 0;
 228                 }
 229
 230                 sbuf = p->src_sg_it.addr + p->src_start;
 231
 232                 copy_len = min(p->sg_src_left, len);
 233                 memcpy(dbuf, sbuf, copy_len);
 234
 235                 p->src_start += copy_len;
 236                 p->sg_src_left -= copy_len;
 237
 238                 len -= copy_len;
 239                 dbuf += copy_len;
 240         }
 241 }
 242
 243 static void setup_data_in(void)
 244 {
 245         struct req_progress *p = &cpg->p;
 246         int data_in_sram =
 247             min(p->hw_nbytes - p->hw_processed_bytes, cpg->max_req_size);
 248         copy_src_to_buf(p, cpg->sram + SRAM_DATA_IN_START + p->crypt_len,
 249                         data_in_sram - p->crypt_len);
 250         p->crypt_len = data_in_sram;
 251 }
 252
 253 static void mv_process_current_q(int first_block)
 254 {
 255         struct ablkcipher_request *req = ablkcipher_request_cast(cpg->cur_req);
 256         struct mv_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
 257         struct mv_req_ctx *req_ctx = ablkcipher_request_ctx(req);
 258         struct sec_accel_config op;
 259
 260         switch (req_ctx->op) {
 261         case COP_AES_ECB:
 262                 op.config = CFG_OP_CRYPT_ONLY | CFG_ENCM_AES | CFG_ENC_MODE_ECB;
 263                 break;
 264         case COP_AES_CBC:
 265         default:
 266                 op.config = CFG_OP_CRYPT_ONLY | CFG_ENCM_AES | CFG_ENC_MODE_CBC;
 267                 op.enc_iv = ENC_IV_POINT(SRAM_DATA_IV) |
 268                         ENC_IV_BUF_POINT(SRAM_DATA_IV_BUF);
 269                 if (first_block)
 270                         memcpy(cpg->sram + SRAM_DATA_IV, req->info, 16);
 271                 break;
 272         }
 273         if (req_ctx->decrypt) {
 274                 op.config |= CFG_DIR_DEC;
 275                 memcpy(cpg->sram + SRAM_DATA_KEY_P, ctx->aes_dec_key,
 276                                 AES_KEY_LEN);
 277         } else {
 278                 op.config |= CFG_DIR_ENC;
 279                 memcpy(cpg->sram + SRAM_DATA_KEY_P, ctx->aes_enc_key,
 280                                 AES_KEY_LEN);
 281         }
 282
 283         switch (ctx->key_len) {
 284         case AES_KEYSIZE_128:
 285                 op.config |= CFG_AES_LEN_128;
 286                 break;
 287         case AES_KEYSIZE_192:
 288                 op.config |= CFG_AES_LEN_192;
 289                 break;
 290         case AES_KEYSIZE_256:
 291                 op.config |= CFG_AES_LEN_256;
 292                 break;
 293         }
 294         op.enc_p = ENC_P_SRC(SRAM_DATA_IN_START) |
 295                 ENC_P_DST(SRAM_DATA_OUT_START);
 296         op.enc_key_p = SRAM_DATA_KEY_P;
 297
 298         setup_data_in();
 299         op.enc_len = cpg->p.crypt_len;
 300         memcpy(cpg->sram + SRAM_CONFIG, &op,
 301                         sizeof(struct sec_accel_config));
 302
 303         /* GO */
 304         mv_setup_timer();
 305         writel(SEC_CMD_EN_SEC_ACCL0, cpg->reg + SEC_ACCEL_CMD);
 306 }
 307
 308 static void mv_crypto_algo_completion(void)
 309 {
 310         struct ablkcipher_request *req = ablkcipher_request_cast(cpg->cur_req);
 311         struct mv_req_ctx *req_ctx = ablkcipher_request_ctx(req);
 312
 313         sg_miter_stop(&cpg->p.src_sg_it);
 314         sg_miter_stop(&cpg->p.dst_sg_it);
 315
 316         if (req_ctx->op != COP_AES_CBC)
 317                 return ;
 318
 319         memcpy(req->info, cpg->sram + SRAM_DATA_IV_BUF, 16);
 320 }
 321
 322 static void mv_process_hash_current(int first_block)
 323 {
 324         struct ahash_request *req = ahash_request_cast(cpg->cur_req);
 325         const struct mv_tfm_hash_ctx *tfm_ctx = crypto_tfm_ctx(req->base.tfm);
 326         struct mv_req_hash_ctx *req_ctx = ahash_request_ctx(req);
 327         struct req_progress *p = &cpg->p;
 328         struct sec_accel_config op = { 0 };
 329         int is_last;
 330
 331         switch (req_ctx->op) {
 332         case COP_SHA1:
 333         default:
 334                 op.config = CFG_OP_MAC_ONLY | CFG_MACM_SHA1;
 335                 break;
 336         case COP_HMAC_SHA1:
 337                 op.config = CFG_OP_MAC_ONLY | CFG_MACM_HMAC_SHA1;
 338                 memcpy(cpg->sram + SRAM_HMAC_IV_IN,
 339                                 tfm_ctx->ivs, sizeof(tfm_ctx->ivs));
 340                 break;
 341         }
 342
 343         op.mac_src_p =
 344                 MAC_SRC_DATA_P(SRAM_DATA_IN_START) | MAC_SRC_TOTAL_LEN((u32)
 345                 req_ctx->
 346                 count);
 347
 348         setup_data_in();
 349
 350         op.mac_digest =
 351                 MAC_DIGEST_P(SRAM_DIGEST_BUF) | MAC_FRAG_LEN(p->crypt_len);
 352         op.mac_iv =
 353                 MAC_INNER_IV_P(SRAM_HMAC_IV_IN) |
 354                 MAC_OUTER_IV_P(SRAM_HMAC_IV_OUT);
 355
 356         is_last = req_ctx->last_chunk
 357                 && (p->hw_processed_bytes + p->crypt_len >= p->hw_nbytes)
 358                 && (req_ctx->count <= MAX_HW_HASH_SIZE);
 359         if (req_ctx->first_hash) {
 360                 if (is_last)
 361                         op.config |= CFG_NOT_FRAG;
 362                 else
 363                         op.config |= CFG_FIRST_FRAG;
 364
 365                 req_ctx->first_hash = 0;
 366         } else {
 367                 if (is_last)
 368                         op.config |= CFG_LAST_FRAG;
 369                 else
 370                         op.config |= CFG_MID_FRAG;
 371
 372                 if (first_block) {
 373                         writel(req_ctx->state[0], cpg->reg + DIGEST_INITIAL_VAL_A);
 374                         writel(req_ctx->state[1], cpg->reg + DIGEST_INITIAL_VAL_B);
 375                         writel(req_ctx->state[2], cpg->reg + DIGEST_INITIAL_VAL_C);
 376                         writel(req_ctx->state[3], cpg->reg + DIGEST_INITIAL_VAL_D);
 377                         writel(req_ctx->state[4], cpg->reg + DIGEST_INITIAL_VAL_E);
 378                 }
 379         }
 380
 381         memcpy(cpg->sram + SRAM_CONFIG, &op, sizeof(struct sec_accel_config));
 382
 383         /* GO */
 384         mv_setup_timer();
 385         writel(SEC_CMD_EN_SEC_ACCL0, cpg->reg + SEC_ACCEL_CMD);
 386 }
 387
 388 static inline int mv_hash_import_sha1_ctx(const struct mv_req_hash_ctx *ctx,
 389                                           struct shash_desc *desc)
 390 {
 391         int i;
 392         struct sha1_state shash_state;
 393
 394         shash_state.count = ctx->count + ctx->count_add;
 395         for (i = 0; i < 5; i++)
 396                 shash_state.state[i] = ctx->state[i];
 397         memcpy(shash_state.buffer, ctx->buffer, sizeof(shash_state.buffer));
 398         return crypto_shash_import(desc, &shash_state);
 399 }
 400
 401 static int mv_hash_final_fallback(struct ahash_request *req)
 402 {
 403         const struct mv_tfm_hash_ctx *tfm_ctx = crypto_tfm_ctx(req->base.tfm);
 404         struct mv_req_hash_ctx *req_ctx = ahash_request_ctx(req);
 405         SHASH_DESC_ON_STACK(shash, tfm_ctx->fallback);
 406         int rc;
 407
 408         shash->tfm = tfm_ctx->fallback;
 409         shash->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
 410         if (unlikely(req_ctx->first_hash)) {
 411                 crypto_shash_init(shash);
 412                 crypto_shash_update(shash, req_ctx->buffer,
 413                                     req_ctx->extra_bytes);
 414         } else {
 415                 /* only SHA1 for now....
 416                  */
 417                 rc = mv_hash_import_sha1_ctx(req_ctx, shash);
 418                 if (rc)
 419                         goto out;
 420         }
 421         rc = crypto_shash_final(shash, req->result);
 422 out:
 423         return rc;
 424 }
 425
 426 static void mv_save_digest_state(struct mv_req_hash_ctx *ctx)
 427 {
 428         ctx->state[0] = readl(cpg->reg + DIGEST_INITIAL_VAL_A);
 429         ctx->state[1] = readl(cpg->reg + DIGEST_INITIAL_VAL_B);
 430         ctx->state[2] = readl(cpg->reg + DIGEST_INITIAL_VAL_C);
 431         ctx->state[3] = readl(cpg->reg + DIGEST_INITIAL_VAL_D);
 432         ctx->state[4] = readl(cpg->reg + DIGEST_INITIAL_VAL_E);
 433 }
 434
 435 static void mv_hash_algo_completion(void)
 436 {
 437         struct ahash_request *req = ahash_request_cast(cpg->cur_req);
 438         struct mv_req_hash_ctx *ctx = ahash_request_ctx(req);
 439
 440         if (ctx->extra_bytes)
 441                 copy_src_to_buf(&cpg->p, ctx->buffer, ctx->extra_bytes);
 442         sg_miter_stop(&cpg->p.src_sg_it);
 443
 444         if (likely(ctx->last_chunk)) {
 445                 if (likely(ctx->count <= MAX_HW_HASH_SIZE)) {
 446                         memcpy(req->result, cpg->sram + SRAM_DIGEST_BUF,
 447                                crypto_ahash_digestsize(crypto_ahash_reqtfm
 448                                                        (req)));
 449                 } else {
 450                         mv_save_digest_state(ctx);
 451                         mv_hash_final_fallback(req);
 452                 }
 453         } else {
 454                 mv_save_digest_state(ctx);
 455         }
 456 }
 457
 458 static void dequeue_complete_req(void)
 459 {
 460         struct crypto_async_request *req = cpg->cur_req;
 461         void *buf;
 462         int ret;
 463         cpg->p.hw_processed_bytes += cpg->p.crypt_len;
 464         if (cpg->p.copy_back) {
 465                 int need_copy_len = cpg->p.crypt_len;
 466                 int sram_offset = 0;
 467                 do {
 468                         int dst_copy;
 469
 470                         if (!cpg->p.sg_dst_left) {
 471                                 ret = sg_miter_next(&cpg->p.dst_sg_it);
 472                                 BUG_ON(!ret);
 473                                 cpg->p.sg_dst_left = cpg->p.dst_sg_it.length;
 474                                 cpg->p.dst_start = 0;
 475                         }
 476
 477                         buf = cpg->p.dst_sg_it.addr;
 478                         buf += cpg->p.dst_start;
 479
 480                         dst_copy = min(need_copy_len, cpg->p.sg_dst_left);
 481
 482                         memcpy(buf,
 483                                cpg->sram + SRAM_DATA_OUT_START + sram_offset,
 484                                dst_copy);
 485                         sram_offset += dst_copy;
 486                         cpg->p.sg_dst_left -= dst_copy;
 487                         need_copy_len -= dst_copy;
 488                         cpg->p.dst_start += dst_copy;
 489                 } while (need_copy_len > 0);
 490         }
 491
 492         cpg->p.crypt_len = 0;
 493
 494         BUG_ON(cpg->eng_st != ENGINE_W_DEQUEUE);
 495         if (cpg->p.hw_processed_bytes < cpg->p.hw_nbytes) {
 496                 /* process next scatter list entry */
 497                 cpg->eng_st = ENGINE_BUSY;
 498                 cpg->p.process(0);
 499         } else {
 500                 cpg->p.complete();
 501                 cpg->eng_st = ENGINE_IDLE;
 502                 local_bh_disable();
 503                 req->complete(req, 0);
 504                 local_bh_enable();
 505         }
 506 }
 507
 508 static int count_sgs(struct scatterlist *sl, unsigned int total_bytes)
 509 {
 510         int i = 0;
 511         size_t cur_len;
 512
 513         while (sl) {
 514                 cur_len = sl[i].length;
 515                 ++i;
 516                 if (total_bytes > cur_len)
 517                         total_bytes -= cur_len;
 518                 else
 519                         break;
 520         }
 521
 522         return i;
 523 }
 524
 525 static void mv_start_new_crypt_req(struct ablkcipher_request *req)
 526 {
 527         struct req_progress *p = &cpg->p;
 528         int num_sgs;
 529
 530         cpg->cur_req = &req->base;
 531         memset(p, 0, sizeof(struct req_progress));
 532         p->hw_nbytes = req->nbytes;
 533         p->complete = mv_crypto_algo_completion;
 534         p->process = mv_process_current_q;
 535         p->copy_back = 1;
 536
 537         num_sgs = count_sgs(req->src, req->nbytes);
 538         sg_miter_start(&p->src_sg_it, req->src, num_sgs, SG_MITER_FROM_SG);
 539
 540         num_sgs = count_sgs(req->dst, req->nbytes);
 541         sg_miter_start(&p->dst_sg_it, req->dst, num_sgs, SG_MITER_TO_SG);
 542
 543         mv_process_current_q(1);
 544 }
 545
 546 static void mv_start_new_hash_req(struct ahash_request *req)
 547 {
 548         struct req_progress *p = &cpg->p;
 549         struct mv_req_hash_ctx *ctx = ahash_request_ctx(req);
 550         int num_sgs, hw_bytes, old_extra_bytes, rc;
 551         cpg->cur_req = &req->base;
 552         memset(p, 0, sizeof(struct req_progress));
 553         hw_bytes = req->nbytes + ctx->extra_bytes;
 554         old_extra_bytes = ctx->extra_bytes;
 555
 556         ctx->extra_bytes = hw_bytes % SHA1_BLOCK_SIZE;
 557         if (ctx->extra_bytes != 0
 558             && (!ctx->last_chunk || ctx->count > MAX_HW_HASH_SIZE))
 559                 hw_bytes -= ctx->extra_bytes;
 560         else
 561                 ctx->extra_bytes = 0;
 562
 563         num_sgs = count_sgs(req->src, req->nbytes);
 564         sg_miter_start(&p->src_sg_it, req->src, num_sgs, SG_MITER_FROM_SG);
 565
 566         if (hw_bytes) {
 567                 p->hw_nbytes = hw_bytes;
 568                 p->complete = mv_hash_algo_completion;
 569                 p->process = mv_process_hash_current;
 570
 571                 if (unlikely(old_extra_bytes)) {
 572                         memcpy(cpg->sram + SRAM_DATA_IN_START, ctx->buffer,
 573                                old_extra_bytes);
 574                         p->crypt_len = old_extra_bytes;
 575                 }
 576
 577                 mv_process_hash_current(1);
 578         } else {
 579                 copy_src_to_buf(p, ctx->buffer + old_extra_bytes,
 580                                 ctx->extra_bytes - old_extra_bytes);
 581                 sg_miter_stop(&p->src_sg_it);
 582                 if (ctx->last_chunk)
 583                         rc = mv_hash_final_fallback(req);
 584                 else
 585                         rc = 0;
 586                 cpg->eng_st = ENGINE_IDLE;
 587                 local_bh_disable();
 588                 req->base.complete(&req->base, rc);
 589                 local_bh_enable();
 590         }
 591 }
 592
 593 static int queue_manag(void *data)
 594 {
 595         cpg->eng_st = ENGINE_IDLE;
 596         do {
 597                 struct crypto_async_request *async_req = NULL;
 598                 struct crypto_async_request *backlog;
 599
 600                 __set_current_state(TASK_INTERRUPTIBLE);
 601
 602                 if (cpg->eng_st == ENGINE_W_DEQUEUE)
 603                         dequeue_complete_req();
 604
 605                 spin_lock_irq(&cpg->lock);
 606                 if (cpg->eng_st == ENGINE_IDLE) {
 607                         backlog = crypto_get_backlog(&cpg->queue);
 608                         async_req = crypto_dequeue_request(&cpg->queue);
 609                         if (async_req) {
 610                                 BUG_ON(cpg->eng_st != ENGINE_IDLE);
 611                                 cpg->eng_st = ENGINE_BUSY;
 612                         }
 613                 }
 614                 spin_unlock_irq(&cpg->lock);
 615
 616                 if (backlog) {
 617                         backlog->complete(backlog, -EINPROGRESS);
 618                         backlog = NULL;
 619                 }
 620
 621                 if (async_req) {
 622                         if (crypto_tfm_alg_type(async_req->tfm) !=
 623                             CRYPTO_ALG_TYPE_AHASH) {
 624                                 struct ablkcipher_request *req =
 625                                     ablkcipher_request_cast(async_req);
 626                                 mv_start_new_crypt_req(req);
 627                         } else {
 628                                 struct ahash_request *req =
 629                                     ahash_request_cast(async_req);
 630                                 mv_start_new_hash_req(req);
 631                         }
 632                         async_req = NULL;
 633                 }
 634
 635                 schedule();
 636
 637         } while (!kthread_should_stop());
 638         return 0;
 639 }
 640
 641 static int mv_handle_req(struct crypto_async_request *req)
 642 {
 643         unsigned long flags;
 644         int ret;
 645
 646         spin_lock_irqsave(&cpg->lock, flags);
 647         ret = crypto_enqueue_request(&cpg->queue, req);
 648         spin_unlock_irqrestore(&cpg->lock, flags);
 649         wake_up_process(cpg->queue_th);
 650         return ret;
 651 }
 652
 653 static int mv_enc_aes_ecb(struct ablkcipher_request *req)
 654 {
 655         struct mv_req_ctx *req_ctx = ablkcipher_request_ctx(req);
 656
 657         req_ctx->op = COP_AES_ECB;
 658         req_ctx->decrypt = 0;
 659
 660         return mv_handle_req(&req->base);
 661 }
 662
 663 static int mv_dec_aes_ecb(struct ablkcipher_request *req)
 664 {
 665         struct mv_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
 666         struct mv_req_ctx *req_ctx = ablkcipher_request_ctx(req);
 667
 668         req_ctx->op = COP_AES_ECB;
 669         req_ctx->decrypt = 1;
 670
 671         compute_aes_dec_key(ctx);
 672         return mv_handle_req(&req->base);
 673 }
 674
 675 static int mv_enc_aes_cbc(struct ablkcipher_request *req)
 676 {
 677         struct mv_req_ctx *req_ctx = ablkcipher_request_ctx(req);
 678
 679         req_ctx->op = COP_AES_CBC;
 680         req_ctx->decrypt = 0;
 681
 682         return mv_handle_req(&req->base);
 683 }
 684
 685 static int mv_dec_aes_cbc(struct ablkcipher_request *req)
 686 {
 687         struct mv_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
 688         struct mv_req_ctx *req_ctx = ablkcipher_request_ctx(req);
 689
 690         req_ctx->op = COP_AES_CBC;
 691         req_ctx->decrypt = 1;
 692
 693         compute_aes_dec_key(ctx);
 694         return mv_handle_req(&req->base);
 695 }
 696
 697 static int mv_cra_init(struct crypto_tfm *tfm)
 698 {
 699         tfm->crt_ablkcipher.reqsize = sizeof(struct mv_req_ctx);
 700         return 0;
 701 }
 702
 703 static void mv_init_hash_req_ctx(struct mv_req_hash_ctx *ctx, int op,
 704                                  int is_last, unsigned int req_len,
 705                                  int count_add)
 706 {
 707         memset(ctx, 0, sizeof(*ctx));
 708         ctx->op = op;
 709         ctx->count = req_len;
 710         ctx->first_hash = 1;
 711         ctx->last_chunk = is_last;
 712         ctx->count_add = count_add;
 713 }
 714
 715 static void mv_update_hash_req_ctx(struct mv_req_hash_ctx *ctx, int is_last,
 716                                    unsigned req_len)
 717 {
 718         ctx->last_chunk = is_last;
 719         ctx->count += req_len;
 720 }
 721
 722 static int mv_hash_init(struct ahash_request *req)
 723 {
 724         const struct mv_tfm_hash_ctx *tfm_ctx = crypto_tfm_ctx(req->base.tfm);
 725         mv_init_hash_req_ctx(ahash_request_ctx(req), tfm_ctx->op, 0, 0,
 726                              tfm_ctx->count_add);
 727         return 0;
 728 }
 729
 730 static int mv_hash_update(struct ahash_request *req)
 731 {
 732         if (!req->nbytes)
 733                 return 0;
 734
 735         mv_update_hash_req_ctx(ahash_request_ctx(req), 0, req->nbytes);
 736         return mv_handle_req(&req->base);
 737 }
 738
 739 static int mv_hash_final(struct ahash_request *req)
 740 {
 741         struct mv_req_hash_ctx *ctx = ahash_request_ctx(req);
 742
 743         ahash_request_set_crypt(req, NULL, req->result, 0);
 744         mv_update_hash_req_ctx(ctx, 1, 0);
 745         return mv_handle_req(&req->base);
 746 }
 747
 748 static int mv_hash_finup(struct ahash_request *req)
 749 {
 750         mv_update_hash_req_ctx(ahash_request_ctx(req), 1, req->nbytes);
 751         return mv_handle_req(&req->base);
 752 }
 753
 754 static int mv_hash_digest(struct ahash_request *req)
 755 {
 756         const struct mv_tfm_hash_ctx *tfm_ctx = crypto_tfm_ctx(req->base.tfm);
 757         mv_init_hash_req_ctx(ahash_request_ctx(req), tfm_ctx->op, 1,
 758                              req->nbytes, tfm_ctx->count_add);
 759         return mv_handle_req(&req->base);
 760 }
 761
 762 static void mv_hash_init_ivs(struct mv_tfm_hash_ctx *ctx, const void *istate,
 763                              const void *ostate)
 764 {
 765         const struct sha1_state *isha1_state = istate, *osha1_state = ostate;
 766         int i;
 767         for (i = 0; i < 5; i++) {
 768                 ctx->ivs[i] = cpu_to_be32(isha1_state->state[i]);
 769                 ctx->ivs[i + 5] = cpu_to_be32(osha1_state->state[i]);
 770         }
 771 }
 772
 773 static int mv_hash_setkey(struct crypto_ahash *tfm, const u8 * key,
 774                           unsigned int keylen)
 775 {
 776         int rc;
 777         struct mv_tfm_hash_ctx *ctx = crypto_tfm_ctx(&tfm->base);
 778         int bs, ds, ss;
 779
 780         if (!ctx->base_hash)
 781                 return 0;
 782
 783         rc = crypto_shash_setkey(ctx->fallback, key, keylen);
 784         if (rc)
 785                 return rc;
 786
 787         /* Can't see a way to extract the ipad/opad from the fallback tfm
 788            so I'm basically copying code from the hmac module */
 789         bs = crypto_shash_blocksize(ctx->base_hash);
 790         ds = crypto_shash_digestsize(ctx->base_hash);
 791         ss = crypto_shash_statesize(ctx->base_hash);
 792
 793         {
 794                 SHASH_DESC_ON_STACK(shash, ctx->base_hash);
 795
 796                 unsigned int i;
 797                 char ipad[ss];
 798                 char opad[ss];
 799
 800                 shash->tfm = ctx->base_hash;
 801                 shash->flags = crypto_shash_get_flags(ctx->base_hash) &
 802                     CRYPTO_TFM_REQ_MAY_SLEEP;
 803
 804                 if (keylen > bs) {
 805                         int err;
 806
 807                         err =
 808                             crypto_shash_digest(shash, key, keylen, ipad);
 809                         if (err)
 810                                 return err;
 811
 812                         keylen = ds;
 813                 } else
 814                         memcpy(ipad, key, keylen);
 815
 816                 memset(ipad + keylen, 0, bs - keylen);
 817                 memcpy(opad, ipad, bs);
 818
 819                 for (i = 0; i < bs; i++) {
 820                         ipad[i] ^= 0x36;
 821                         opad[i] ^= 0x5c;
 822                 }
 823
 824                 rc = crypto_shash_init(shash) ? :
 825                     crypto_shash_update(shash, ipad, bs) ? :
 826                     crypto_shash_export(shash, ipad) ? :
 827                     crypto_shash_init(shash) ? :
 828                     crypto_shash_update(shash, opad, bs) ? :
 829                     crypto_shash_export(shash, opad);
 830
 831                 if (rc == 0)
 832                         mv_hash_init_ivs(ctx, ipad, opad);
 833
 834                 return rc;
 835         }
 836 }
 837
 838 static int mv_cra_hash_init(struct crypto_tfm *tfm, const char *base_hash_name,
 839                             enum hash_op op, int count_add)
 840 {
 841         const char *fallback_driver_name = crypto_tfm_alg_name(tfm);
 842         struct mv_tfm_hash_ctx *ctx = crypto_tfm_ctx(tfm);
 843         struct crypto_shash *fallback_tfm = NULL;
 844         struct crypto_shash *base_hash = NULL;
 845         int err = -ENOMEM;
 846
 847         ctx->op = op;
 848         ctx->count_add = count_add;
 849
 850         /* Allocate a fallback and abort if it failed. */
 851         fallback_tfm = crypto_alloc_shash(fallback_driver_name, 0,
 852                                           CRYPTO_ALG_NEED_FALLBACK);
 853         if (IS_ERR(fallback_tfm)) {
 854                 printk(KERN_WARNING MV_CESA
 855                        "Fallback driver '%s' could not be loaded!\n",
 856                        fallback_driver_name);
 857                 err = PTR_ERR(fallback_tfm);
 858                 goto out;
 859         }
 860         ctx->fallback = fallback_tfm;
 861
 862         if (base_hash_name) {
 863                 /* Allocate a hash to compute the ipad/opad of hmac. */
 864                 base_hash = crypto_alloc_shash(base_hash_name, 0,
 865                                                CRYPTO_ALG_NEED_FALLBACK);
 866                 if (IS_ERR(base_hash)) {
 867                         printk(KERN_WARNING MV_CESA
 868                                "Base driver '%s' could not be loaded!\n",
 869                                base_hash_name);
 870                         err = PTR_ERR(base_hash);
 871                         goto err_bad_base;
 872                 }
 873         }
 874         ctx->base_hash = base_hash;
 875
 876         crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
 877                                  sizeof(struct mv_req_hash_ctx) +
 878                                  crypto_shash_descsize(ctx->fallback));
 879         return 0;
 880 err_bad_base:
 881         crypto_free_shash(fallback_tfm);
 882 out:
 883         return err;
 884 }
 885
 886 static void mv_cra_hash_exit(struct crypto_tfm *tfm)
 887 {
 888         struct mv_tfm_hash_ctx *ctx = crypto_tfm_ctx(tfm);
 889
 890         crypto_free_shash(ctx->fallback);
 891         if (ctx->base_hash)
 892                 crypto_free_shash(ctx->base_hash);
 893 }
 894
 895 static int mv_cra_hash_sha1_init(struct crypto_tfm *tfm)
 896 {
 897         return mv_cra_hash_init(tfm, NULL, COP_SHA1, 0);
 898 }
 899
 900 static int mv_cra_hash_hmac_sha1_init(struct crypto_tfm *tfm)
 901 {
 902         return mv_cra_hash_init(tfm, "sha1", COP_HMAC_SHA1, SHA1_BLOCK_SIZE);
 903 }
 904
 905 static irqreturn_t crypto_int(int irq, void *priv)
 906 {
 907         u32 val;
 908
 909         val = readl(cpg->reg + SEC_ACCEL_INT_STATUS);
 910         if (!(val & SEC_INT_ACCEL0_DONE))
 911                 return IRQ_NONE;
 912
 913         if (!del_timer(&cpg->completion_timer)) {
 914                 printk(KERN_WARNING MV_CESA
 915                        "got an interrupt but no pending timer?\n");
 916         }
 917         val &= ~SEC_INT_ACCEL0_DONE;
 918         writel(val, cpg->reg + FPGA_INT_STATUS);
 919         writel(val, cpg->reg + SEC_ACCEL_INT_STATUS);
 920         BUG_ON(cpg->eng_st != ENGINE_BUSY);
 921         cpg->eng_st = ENGINE_W_DEQUEUE;
 922         wake_up_process(cpg->queue_th);
 923         return IRQ_HANDLED;
 924 }
 925
 926 static struct crypto_alg mv_aes_alg_ecb = {
 927         .cra_name               = "ecb(aes)",
 928         .cra_driver_name        = "mv-ecb-aes",
 929         .cra_priority   = 300,
 930         .cra_flags      = CRYPTO_ALG_TYPE_ABLKCIPHER |
 931                           CRYPTO_ALG_KERN_DRIVER_ONLY | CRYPTO_ALG_ASYNC,
 932         .cra_blocksize  = 16,
 933         .cra_ctxsize    = sizeof(struct mv_ctx),
 934         .cra_alignmask  = 0,
 935         .cra_type       = &crypto_ablkcipher_type,
 936         .cra_module     = THIS_MODULE,
 937         .cra_init       = mv_cra_init,
 938         .cra_u          = {
 939                 .ablkcipher = {
 940                         .min_keysize    =       AES_MIN_KEY_SIZE,
 941                         .max_keysize    =       AES_MAX_KEY_SIZE,
 942                         .setkey         =       mv_setkey_aes,
 943                         .encrypt        =       mv_enc_aes_ecb,
 944                         .decrypt        =       mv_dec_aes_ecb,
 945                 },
 946         },
 947 };
 948
 949 static struct crypto_alg mv_aes_alg_cbc = {
 950         .cra_name               = "cbc(aes)",
 951         .cra_driver_name        = "mv-cbc-aes",
 952         .cra_priority   = 300,
 953         .cra_flags      = CRYPTO_ALG_TYPE_ABLKCIPHER |
 954                           CRYPTO_ALG_KERN_DRIVER_ONLY | CRYPTO_ALG_ASYNC,
 955         .cra_blocksize  = AES_BLOCK_SIZE,
 956         .cra_ctxsize    = sizeof(struct mv_ctx),
 957         .cra_alignmask  = 0,
 958         .cra_type       = &crypto_ablkcipher_type,
 959         .cra_module     = THIS_MODULE,
 960         .cra_init       = mv_cra_init,
 961         .cra_u          = {
 962                 .ablkcipher = {
 963                         .ivsize         =       AES_BLOCK_SIZE,
 964                         .min_keysize    =       AES_MIN_KEY_SIZE,
 965                         .max_keysize    =       AES_MAX_KEY_SIZE,
 966                         .setkey         =       mv_setkey_aes,
 967                         .encrypt        =       mv_enc_aes_cbc,
 968                         .decrypt        =       mv_dec_aes_cbc,
 969                 },
 970         },
 971 };
 972
 973 static struct ahash_alg mv_sha1_alg = {
 974         .init = mv_hash_init,
 975         .update = mv_hash_update,
 976         .final = mv_hash_final,
 977         .finup = mv_hash_finup,
 978         .digest = mv_hash_digest,
 979         .halg = {
 980                  .digestsize = SHA1_DIGEST_SIZE,
 981                  .base = {
 982                           .cra_name = "sha1",
 983                           .cra_driver_name = "mv-sha1",
 984                           .cra_priority = 300,
 985                           .cra_flags =
 986                           CRYPTO_ALG_ASYNC | CRYPTO_ALG_KERN_DRIVER_ONLY |
 987                           CRYPTO_ALG_NEED_FALLBACK,
 988                           .cra_blocksize = SHA1_BLOCK_SIZE,
 989                           .cra_ctxsize = sizeof(struct mv_tfm_hash_ctx),
 990                           .cra_init = mv_cra_hash_sha1_init,
 991                           .cra_exit = mv_cra_hash_exit,
 992                           .cra_module = THIS_MODULE,
 993                           }
 994                  }
 995 };
 996
 997 static struct ahash_alg mv_hmac_sha1_alg = {
 998         .init = mv_hash_init,
 999         .update = mv_hash_update,
1000         .final = mv_hash_final,
1001         .finup = mv_hash_finup,
1002         .digest = mv_hash_digest,
1003         .setkey = mv_hash_setkey,
1004         .halg = {
1005                  .digestsize = SHA1_DIGEST_SIZE,
1006                  .base = {
1007                           .cra_name = "hmac(sha1)",
1008                           .cra_driver_name = "mv-hmac-sha1",
1009                           .cra_priority = 300,
1010                           .cra_flags =
1011                           CRYPTO_ALG_ASYNC | CRYPTO_ALG_KERN_DRIVER_ONLY |
1012                           CRYPTO_ALG_NEED_FALLBACK,
1013                           .cra_blocksize = SHA1_BLOCK_SIZE,
1014                           .cra_ctxsize = sizeof(struct mv_tfm_hash_ctx),
1015                           .cra_init = mv_cra_hash_hmac_sha1_init,
1016                           .cra_exit = mv_cra_hash_exit,
1017                           .cra_module = THIS_MODULE,
1018                           }
1019                  }
1020 };
1021
1022 static int mv_probe(struct platform_device *pdev)
1023 {
1024         struct crypto_priv *cp;
1025         struct resource *res;
1026         int irq;
1027         int ret;
1028
1029         if (cpg) {
1030                 printk(KERN_ERR MV_CESA "Second crypto dev?\n");
1031                 return -EEXIST;
1032         }
1033
1034         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
1035         if (!res)
1036                 return -ENXIO;
1037
1038         cp = kzalloc(sizeof(*cp), GFP_KERNEL);
1039         if (!cp)
1040                 return -ENOMEM;
1041
1042         spin_lock_init(&cp->lock);
1043         crypto_init_queue(&cp->queue, 50);
1044         cp->reg = ioremap(res->start, resource_size(res));
1045         if (!cp->reg) {
1046                 ret = -ENOMEM;
1047                 goto err;
1048         }
1049
1050         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "sram");
1051         if (!res) {
1052                 ret = -ENXIO;
1053                 goto err_unmap_reg;
1054         }
1055         cp->sram_size = resource_size(res);
1056         cp->max_req_size = cp->sram_size - SRAM_CFG_SPACE;
1057         cp->sram = ioremap(res->start, cp->sram_size);
1058         if (!cp->sram) {
1059                 ret = -ENOMEM;
1060                 goto err_unmap_reg;
1061         }
1062
1063         if (pdev->dev.of_node)
1064                 irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
1065         else
1066                 irq = platform_get_irq(pdev, 0);
1067         if (irq < 0 || irq == NO_IRQ) {
1068                 ret = irq;
1069                 goto err_unmap_sram;
1070         }
1071         cp->irq = irq;
1072
1073         platform_set_drvdata(pdev, cp);
1074         cpg = cp;
1075
1076         cp->queue_th = kthread_run(queue_manag, cp, "mv_crypto");
1077         if (IS_ERR(cp->queue_th)) {
1078                 ret = PTR_ERR(cp->queue_th);
1079                 goto err_unmap_sram;
1080         }
1081
1082         ret = request_irq(irq, crypto_int, 0, dev_name(&pdev->dev),
1083                         cp);
1084         if (ret)
1085                 goto err_thread;
1086
1087         /* Not all platforms can gate the clock, so it is not
1088            an error if the clock does not exists. */
1089         cp->clk = clk_get(&pdev->dev, NULL);
1090         if (!IS_ERR(cp->clk))
1091                 clk_prepare_enable(cp->clk);
1092
1093         writel(0, cpg->reg + SEC_ACCEL_INT_STATUS);
1094         writel(SEC_INT_ACCEL0_DONE, cpg->reg + SEC_ACCEL_INT_MASK);
1095         writel(SEC_CFG_STOP_DIG_ERR, cpg->reg + SEC_ACCEL_CFG);
1096         writel(SRAM_CONFIG, cpg->reg + SEC_ACCEL_DESC_P0);
1097
1098         ret = crypto_register_alg(&mv_aes_alg_ecb);
1099         if (ret) {
1100                 printk(KERN_WARNING MV_CESA
1101                        "Could not register aes-ecb driver\n");
1102                 goto err_irq;
1103         }
1104
1105         ret = crypto_register_alg(&mv_aes_alg_cbc);
1106         if (ret) {
1107                 printk(KERN_WARNING MV_CESA
1108                        "Could not register aes-cbc driver\n");
1109                 goto err_unreg_ecb;
1110         }
1111
1112         ret = crypto_register_ahash(&mv_sha1_alg);
1113         if (ret == 0)
1114                 cpg->has_sha1 = 1;
1115         else
1116                 printk(KERN_WARNING MV_CESA "Could not register sha1 driver\n");
1117
1118         ret = crypto_register_ahash(&mv_hmac_sha1_alg);
1119         if (ret == 0) {
1120                 cpg->has_hmac_sha1 = 1;
1121         } else {
1122                 printk(KERN_WARNING MV_CESA
1123                        "Could not register hmac-sha1 driver\n");
1124         }
1125
1126         return 0;
1127 err_unreg_ecb:
1128         crypto_unregister_alg(&mv_aes_alg_ecb);
1129 err_irq:
1130         free_irq(irq, cp);
1131         if (!IS_ERR(cp->clk)) {
1132                 clk_disable_unprepare(cp->clk);
1133                 clk_put(cp->clk);
1134         }
1135 err_thread:
1136         kthread_stop(cp->queue_th);
1137 err_unmap_sram:
1138         iounmap(cp->sram);
1139 err_unmap_reg:
1140         iounmap(cp->reg);
1141 err:
1142         kfree(cp);
1143         cpg = NULL;
1144         return ret;
1145 }
1146
1147 static int mv_remove(struct platform_device *pdev)
1148 {
1149         struct crypto_priv *cp = platform_get_drvdata(pdev);
1150
1151         crypto_unregister_alg(&mv_aes_alg_ecb);
1152         crypto_unregister_alg(&mv_aes_alg_cbc);
1153         if (cp->has_sha1)
1154                 crypto_unregister_ahash(&mv_sha1_alg);
1155         if (cp->has_hmac_sha1)
1156                 crypto_unregister_ahash(&mv_hmac_sha1_alg);
1157         kthread_stop(cp->queue_th);
1158         free_irq(cp->irq, cp);
1159         memset(cp->sram, 0, cp->sram_size);
1160         iounmap(cp->sram);
1161         iounmap(cp->reg);
1162
1163         if (!IS_ERR(cp->clk)) {
1164                 clk_disable_unprepare(cp->clk);
1165                 clk_put(cp->clk);
1166         }
1167
1168         kfree(cp);
1169         cpg = NULL;
1170         return 0;
1171 }
1172
1173 static const struct of_device_id mv_cesa_of_match_table[] = {
1174         { .compatible = "marvell,orion-crypto", },
1175         {}
1176 };
1177 MODULE_DEVICE_TABLE(of, mv_cesa_of_match_table);
1178
1179 static struct platform_driver marvell_crypto = {
1180         .probe          = mv_probe,
1181         .remove         = mv_remove,
1182         .driver         = {
1183                 .name   = "mv_crypto",
1184                 .of_match_table = mv_cesa_of_match_table,
1185         },
1186 };
1187 MODULE_ALIAS("platform:mv_crypto");
1188
1189 module_platform_driver(marvell_crypto);
1190
1191 MODULE_AUTHOR("Sebastian Andrzej Siewior <[email protected]>");
1192 MODULE_DESCRIPTION("Support for Marvell's cryptographic engine");
1193 MODULE_LICENSE("GPL");