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         struct {
 406                 struct shash_desc shash;
 407                 char ctx[crypto_shash_descsize(tfm_ctx->fallback)];
 408         } desc;
 409         int rc;
 410
 411         desc.shash.tfm = tfm_ctx->fallback;
 412         desc.shash.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
 413         if (unlikely(req_ctx->first_hash)) {
 414                 crypto_shash_init(&desc.shash);
 415                 crypto_shash_update(&desc.shash, req_ctx->buffer,
 416                                     req_ctx->extra_bytes);
 417         } else {
 418                 /* only SHA1 for now....
 419                  */
 420                 rc = mv_hash_import_sha1_ctx(req_ctx, &desc.shash);
 421                 if (rc)
 422                         goto out;
 423         }
 424         rc = crypto_shash_final(&desc.shash, req->result);
 425 out:
 426         return rc;
 427 }
 428
 429 static void mv_save_digest_state(struct mv_req_hash_ctx *ctx)
 430 {
 431         ctx->state[0] = readl(cpg->reg + DIGEST_INITIAL_VAL_A);
 432         ctx->state[1] = readl(cpg->reg + DIGEST_INITIAL_VAL_B);
 433         ctx->state[2] = readl(cpg->reg + DIGEST_INITIAL_VAL_C);
 434         ctx->state[3] = readl(cpg->reg + DIGEST_INITIAL_VAL_D);
 435         ctx->state[4] = readl(cpg->reg + DIGEST_INITIAL_VAL_E);
 436 }
 437
 438 static void mv_hash_algo_completion(void)
 439 {
 440         struct ahash_request *req = ahash_request_cast(cpg->cur_req);
 441         struct mv_req_hash_ctx *ctx = ahash_request_ctx(req);
 442
 443         if (ctx->extra_bytes)
 444                 copy_src_to_buf(&cpg->p, ctx->buffer, ctx->extra_bytes);
 445         sg_miter_stop(&cpg->p.src_sg_it);
 446
 447         if (likely(ctx->last_chunk)) {
 448                 if (likely(ctx->count <= MAX_HW_HASH_SIZE)) {
 449                         memcpy(req->result, cpg->sram + SRAM_DIGEST_BUF,
 450                                crypto_ahash_digestsize(crypto_ahash_reqtfm
 451                                                        (req)));
 452                 } else {
 453                         mv_save_digest_state(ctx);
 454                         mv_hash_final_fallback(req);
 455                 }
 456         } else {
 457                 mv_save_digest_state(ctx);
 458         }
 459 }
 460
 461 static void dequeue_complete_req(void)
 462 {
 463         struct crypto_async_request *req = cpg->cur_req;
 464         void *buf;
 465         int ret;
 466         cpg->p.hw_processed_bytes += cpg->p.crypt_len;
 467         if (cpg->p.copy_back) {
 468                 int need_copy_len = cpg->p.crypt_len;
 469                 int sram_offset = 0;
 470                 do {
 471                         int dst_copy;
 472
 473                         if (!cpg->p.sg_dst_left) {
 474                                 ret = sg_miter_next(&cpg->p.dst_sg_it);
 475                                 BUG_ON(!ret);
 476                                 cpg->p.sg_dst_left = cpg->p.dst_sg_it.length;
 477                                 cpg->p.dst_start = 0;
 478                         }
 479
 480                         buf = cpg->p.dst_sg_it.addr;
 481                         buf += cpg->p.dst_start;
 482
 483                         dst_copy = min(need_copy_len, cpg->p.sg_dst_left);
 484
 485                         memcpy(buf,
 486                                cpg->sram + SRAM_DATA_OUT_START + sram_offset,
 487                                dst_copy);
 488                         sram_offset += dst_copy;
 489                         cpg->p.sg_dst_left -= dst_copy;
 490                         need_copy_len -= dst_copy;
 491                         cpg->p.dst_start += dst_copy;
 492                 } while (need_copy_len > 0);
 493         }
 494
 495         cpg->p.crypt_len = 0;
 496
 497         BUG_ON(cpg->eng_st != ENGINE_W_DEQUEUE);
 498         if (cpg->p.hw_processed_bytes < cpg->p.hw_nbytes) {
 499                 /* process next scatter list entry */
 500                 cpg->eng_st = ENGINE_BUSY;
 501                 cpg->p.process(0);
 502         } else {
 503                 cpg->p.complete();
 504                 cpg->eng_st = ENGINE_IDLE;
 505                 local_bh_disable();
 506                 req->complete(req, 0);
 507                 local_bh_enable();
 508         }
 509 }
 510
 511 static int count_sgs(struct scatterlist *sl, unsigned int total_bytes)
 512 {
 513         int i = 0;
 514         size_t cur_len;
 515
 516         while (sl) {
 517                 cur_len = sl[i].length;
 518                 ++i;
 519                 if (total_bytes > cur_len)
 520                         total_bytes -= cur_len;
 521                 else
 522                         break;
 523         }
 524
 525         return i;
 526 }
 527
 528 static void mv_start_new_crypt_req(struct ablkcipher_request *req)
 529 {
 530         struct req_progress *p = &cpg->p;
 531         int num_sgs;
 532
 533         cpg->cur_req = &req->base;
 534         memset(p, 0, sizeof(struct req_progress));
 535         p->hw_nbytes = req->nbytes;
 536         p->complete = mv_crypto_algo_completion;
 537         p->process = mv_process_current_q;
 538         p->copy_back = 1;
 539
 540         num_sgs = count_sgs(req->src, req->nbytes);
 541         sg_miter_start(&p->src_sg_it, req->src, num_sgs, SG_MITER_FROM_SG);
 542
 543         num_sgs = count_sgs(req->dst, req->nbytes);
 544         sg_miter_start(&p->dst_sg_it, req->dst, num_sgs, SG_MITER_TO_SG);
 545
 546         mv_process_current_q(1);
 547 }
 548
 549 static void mv_start_new_hash_req(struct ahash_request *req)
 550 {
 551         struct req_progress *p = &cpg->p;
 552         struct mv_req_hash_ctx *ctx = ahash_request_ctx(req);
 553         int num_sgs, hw_bytes, old_extra_bytes, rc;
 554         cpg->cur_req = &req->base;
 555         memset(p, 0, sizeof(struct req_progress));
 556         hw_bytes = req->nbytes + ctx->extra_bytes;
 557         old_extra_bytes = ctx->extra_bytes;
 558
 559         ctx->extra_bytes = hw_bytes % SHA1_BLOCK_SIZE;
 560         if (ctx->extra_bytes != 0
 561             && (!ctx->last_chunk || ctx->count > MAX_HW_HASH_SIZE))
 562                 hw_bytes -= ctx->extra_bytes;
 563         else
 564                 ctx->extra_bytes = 0;
 565
 566         num_sgs = count_sgs(req->src, req->nbytes);
 567         sg_miter_start(&p->src_sg_it, req->src, num_sgs, SG_MITER_FROM_SG);
 568
 569         if (hw_bytes) {
 570                 p->hw_nbytes = hw_bytes;
 571                 p->complete = mv_hash_algo_completion;
 572                 p->process = mv_process_hash_current;
 573
 574                 if (unlikely(old_extra_bytes)) {
 575                         memcpy(cpg->sram + SRAM_DATA_IN_START, ctx->buffer,
 576                                old_extra_bytes);
 577                         p->crypt_len = old_extra_bytes;
 578                 }
 579
 580                 mv_process_hash_current(1);
 581         } else {
 582                 copy_src_to_buf(p, ctx->buffer + old_extra_bytes,
 583                                 ctx->extra_bytes - old_extra_bytes);
 584                 sg_miter_stop(&p->src_sg_it);
 585                 if (ctx->last_chunk)
 586                         rc = mv_hash_final_fallback(req);
 587                 else
 588                         rc = 0;
 589                 cpg->eng_st = ENGINE_IDLE;
 590                 local_bh_disable();
 591                 req->base.complete(&req->base, rc);
 592                 local_bh_enable();
 593         }
 594 }
 595
 596 static int queue_manag(void *data)
 597 {
 598         cpg->eng_st = ENGINE_IDLE;
 599         do {
 600                 struct crypto_async_request *async_req = NULL;
 601                 struct crypto_async_request *backlog;
 602
 603                 __set_current_state(TASK_INTERRUPTIBLE);
 604
 605                 if (cpg->eng_st == ENGINE_W_DEQUEUE)
 606                         dequeue_complete_req();
 607
 608                 spin_lock_irq(&cpg->lock);
 609                 if (cpg->eng_st == ENGINE_IDLE) {
 610                         backlog = crypto_get_backlog(&cpg->queue);
 611                         async_req = crypto_dequeue_request(&cpg->queue);
 612                         if (async_req) {
 613                                 BUG_ON(cpg->eng_st != ENGINE_IDLE);
 614                                 cpg->eng_st = ENGINE_BUSY;
 615                         }
 616                 }
 617                 spin_unlock_irq(&cpg->lock);
 618
 619                 if (backlog) {
 620                         backlog->complete(backlog, -EINPROGRESS);
 621                         backlog = NULL;
 622                 }
 623
 624                 if (async_req) {
 625                         if (async_req->tfm->__crt_alg->cra_type !=
 626                             &crypto_ahash_type) {
 627                                 struct ablkcipher_request *req =
 628                                     ablkcipher_request_cast(async_req);
 629                                 mv_start_new_crypt_req(req);
 630                         } else {
 631                                 struct ahash_request *req =
 632                                     ahash_request_cast(async_req);
 633                                 mv_start_new_hash_req(req);
 634                         }
 635                         async_req = NULL;
 636                 }
 637
 638                 schedule();
 639
 640         } while (!kthread_should_stop());
 641         return 0;
 642 }
 643
 644 static int mv_handle_req(struct crypto_async_request *req)
 645 {
 646         unsigned long flags;
 647         int ret;
 648
 649         spin_lock_irqsave(&cpg->lock, flags);
 650         ret = crypto_enqueue_request(&cpg->queue, req);
 651         spin_unlock_irqrestore(&cpg->lock, flags);
 652         wake_up_process(cpg->queue_th);
 653         return ret;
 654 }
 655
 656 static int mv_enc_aes_ecb(struct ablkcipher_request *req)
 657 {
 658         struct mv_req_ctx *req_ctx = ablkcipher_request_ctx(req);
 659
 660         req_ctx->op = COP_AES_ECB;
 661         req_ctx->decrypt = 0;
 662
 663         return mv_handle_req(&req->base);
 664 }
 665
 666 static int mv_dec_aes_ecb(struct ablkcipher_request *req)
 667 {
 668         struct mv_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
 669         struct mv_req_ctx *req_ctx = ablkcipher_request_ctx(req);
 670
 671         req_ctx->op = COP_AES_ECB;
 672         req_ctx->decrypt = 1;
 673
 674         compute_aes_dec_key(ctx);
 675         return mv_handle_req(&req->base);
 676 }
 677
 678 static int mv_enc_aes_cbc(struct ablkcipher_request *req)
 679 {
 680         struct mv_req_ctx *req_ctx = ablkcipher_request_ctx(req);
 681
 682         req_ctx->op = COP_AES_CBC;
 683         req_ctx->decrypt = 0;
 684
 685         return mv_handle_req(&req->base);
 686 }
 687
 688 static int mv_dec_aes_cbc(struct ablkcipher_request *req)
 689 {
 690         struct mv_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
 691         struct mv_req_ctx *req_ctx = ablkcipher_request_ctx(req);
 692
 693         req_ctx->op = COP_AES_CBC;
 694         req_ctx->decrypt = 1;
 695
 696         compute_aes_dec_key(ctx);
 697         return mv_handle_req(&req->base);
 698 }
 699
 700 static int mv_cra_init(struct crypto_tfm *tfm)
 701 {
 702         tfm->crt_ablkcipher.reqsize = sizeof(struct mv_req_ctx);
 703         return 0;
 704 }
 705
 706 static void mv_init_hash_req_ctx(struct mv_req_hash_ctx *ctx, int op,
 707                                  int is_last, unsigned int req_len,
 708                                  int count_add)
 709 {
 710         memset(ctx, 0, sizeof(*ctx));
 711         ctx->op = op;
 712         ctx->count = req_len;
 713         ctx->first_hash = 1;
 714         ctx->last_chunk = is_last;
 715         ctx->count_add = count_add;
 716 }
 717
 718 static void mv_update_hash_req_ctx(struct mv_req_hash_ctx *ctx, int is_last,
 719                                    unsigned req_len)
 720 {
 721         ctx->last_chunk = is_last;
 722         ctx->count += req_len;
 723 }
 724
 725 static int mv_hash_init(struct ahash_request *req)
 726 {
 727         const struct mv_tfm_hash_ctx *tfm_ctx = crypto_tfm_ctx(req->base.tfm);
 728         mv_init_hash_req_ctx(ahash_request_ctx(req), tfm_ctx->op, 0, 0,
 729                              tfm_ctx->count_add);
 730         return 0;
 731 }
 732
 733 static int mv_hash_update(struct ahash_request *req)
 734 {
 735         if (!req->nbytes)
 736                 return 0;
 737
 738         mv_update_hash_req_ctx(ahash_request_ctx(req), 0, req->nbytes);
 739         return mv_handle_req(&req->base);
 740 }
 741
 742 static int mv_hash_final(struct ahash_request *req)
 743 {
 744         struct mv_req_hash_ctx *ctx = ahash_request_ctx(req);
 745
 746         ahash_request_set_crypt(req, NULL, req->result, 0);
 747         mv_update_hash_req_ctx(ctx, 1, 0);
 748         return mv_handle_req(&req->base);
 749 }
 750
 751 static int mv_hash_finup(struct ahash_request *req)
 752 {
 753         mv_update_hash_req_ctx(ahash_request_ctx(req), 1, req->nbytes);
 754         return mv_handle_req(&req->base);
 755 }
 756
 757 static int mv_hash_digest(struct ahash_request *req)
 758 {
 759         const struct mv_tfm_hash_ctx *tfm_ctx = crypto_tfm_ctx(req->base.tfm);
 760         mv_init_hash_req_ctx(ahash_request_ctx(req), tfm_ctx->op, 1,
 761                              req->nbytes, tfm_ctx->count_add);
 762         return mv_handle_req(&req->base);
 763 }
 764
 765 static void mv_hash_init_ivs(struct mv_tfm_hash_ctx *ctx, const void *istate,
 766                              const void *ostate)
 767 {
 768         const struct sha1_state *isha1_state = istate, *osha1_state = ostate;
 769         int i;
 770         for (i = 0; i < 5; i++) {
 771                 ctx->ivs[i] = cpu_to_be32(isha1_state->state[i]);
 772                 ctx->ivs[i + 5] = cpu_to_be32(osha1_state->state[i]);
 773         }
 774 }
 775
 776 static int mv_hash_setkey(struct crypto_ahash *tfm, const u8 * key,
 777                           unsigned int keylen)
 778 {
 779         int rc;
 780         struct mv_tfm_hash_ctx *ctx = crypto_tfm_ctx(&tfm->base);
 781         int bs, ds, ss;
 782
 783         if (!ctx->base_hash)
 784                 return 0;
 785
 786         rc = crypto_shash_setkey(ctx->fallback, key, keylen);
 787         if (rc)
 788                 return rc;
 789
 790         /* Can't see a way to extract the ipad/opad from the fallback tfm
 791            so I'm basically copying code from the hmac module */
 792         bs = crypto_shash_blocksize(ctx->base_hash);
 793         ds = crypto_shash_digestsize(ctx->base_hash);
 794         ss = crypto_shash_statesize(ctx->base_hash);
 795
 796         {
 797                 struct {
 798                         struct shash_desc shash;
 799                         char ctx[crypto_shash_descsize(ctx->base_hash)];
 800                 } desc;
 801                 unsigned int i;
 802                 char ipad[ss];
 803                 char opad[ss];
 804
 805                 desc.shash.tfm = ctx->base_hash;
 806                 desc.shash.flags = crypto_shash_get_flags(ctx->base_hash) &
 807                     CRYPTO_TFM_REQ_MAY_SLEEP;
 808
 809                 if (keylen > bs) {
 810                         int err;
 811
 812                         err =
 813                             crypto_shash_digest(&desc.shash, key, keylen, ipad);
 814                         if (err)
 815                                 return err;
 816
 817                         keylen = ds;
 818                 } else
 819                         memcpy(ipad, key, keylen);
 820
 821                 memset(ipad + keylen, 0, bs - keylen);
 822                 memcpy(opad, ipad, bs);
 823
 824                 for (i = 0; i < bs; i++) {
 825                         ipad[i] ^= 0x36;
 826                         opad[i] ^= 0x5c;
 827                 }
 828
 829                 rc = crypto_shash_init(&desc.shash) ? :
 830                     crypto_shash_update(&desc.shash, ipad, bs) ? :
 831                     crypto_shash_export(&desc.shash, ipad) ? :
 832                     crypto_shash_init(&desc.shash) ? :
 833                     crypto_shash_update(&desc.shash, opad, bs) ? :
 834                     crypto_shash_export(&desc.shash, opad);
 835
 836                 if (rc == 0)
 837                         mv_hash_init_ivs(ctx, ipad, opad);
 838
 839                 return rc;
 840         }
 841 }
 842
 843 static int mv_cra_hash_init(struct crypto_tfm *tfm, const char *base_hash_name,
 844                             enum hash_op op, int count_add)
 845 {
 846         const char *fallback_driver_name = tfm->__crt_alg->cra_name;
 847         struct mv_tfm_hash_ctx *ctx = crypto_tfm_ctx(tfm);
 848         struct crypto_shash *fallback_tfm = NULL;
 849         struct crypto_shash *base_hash = NULL;
 850         int err = -ENOMEM;
 851
 852         ctx->op = op;
 853         ctx->count_add = count_add;
 854
 855         /* Allocate a fallback and abort if it failed. */
 856         fallback_tfm = crypto_alloc_shash(fallback_driver_name, 0,
 857                                           CRYPTO_ALG_NEED_FALLBACK);
 858         if (IS_ERR(fallback_tfm)) {
 859                 printk(KERN_WARNING MV_CESA
 860                        "Fallback driver '%s' could not be loaded!\n",
 861                        fallback_driver_name);
 862                 err = PTR_ERR(fallback_tfm);
 863                 goto out;
 864         }
 865         ctx->fallback = fallback_tfm;
 866
 867         if (base_hash_name) {
 868                 /* Allocate a hash to compute the ipad/opad of hmac. */
 869                 base_hash = crypto_alloc_shash(base_hash_name, 0,
 870                                                CRYPTO_ALG_NEED_FALLBACK);
 871                 if (IS_ERR(base_hash)) {
 872                         printk(KERN_WARNING MV_CESA
 873                                "Base driver '%s' could not be loaded!\n",
 874                                base_hash_name);
 875                         err = PTR_ERR(base_hash);
 876                         goto err_bad_base;
 877                 }
 878         }
 879         ctx->base_hash = base_hash;
 880
 881         crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
 882                                  sizeof(struct mv_req_hash_ctx) +
 883                                  crypto_shash_descsize(ctx->fallback));
 884         return 0;
 885 err_bad_base:
 886         crypto_free_shash(fallback_tfm);
 887 out:
 888         return err;
 889 }
 890
 891 static void mv_cra_hash_exit(struct crypto_tfm *tfm)
 892 {
 893         struct mv_tfm_hash_ctx *ctx = crypto_tfm_ctx(tfm);
 894
 895         crypto_free_shash(ctx->fallback);
 896         if (ctx->base_hash)
 897                 crypto_free_shash(ctx->base_hash);
 898 }
 899
 900 static int mv_cra_hash_sha1_init(struct crypto_tfm *tfm)
 901 {
 902         return mv_cra_hash_init(tfm, NULL, COP_SHA1, 0);
 903 }
 904
 905 static int mv_cra_hash_hmac_sha1_init(struct crypto_tfm *tfm)
 906 {
 907         return mv_cra_hash_init(tfm, "sha1", COP_HMAC_SHA1, SHA1_BLOCK_SIZE);
 908 }
 909
 910 irqreturn_t crypto_int(int irq, void *priv)
 911 {
 912         u32 val;
 913
 914         val = readl(cpg->reg + SEC_ACCEL_INT_STATUS);
 915         if (!(val & SEC_INT_ACCEL0_DONE))
 916                 return IRQ_NONE;
 917
 918         if (!del_timer(&cpg->completion_timer)) {
 919                 printk(KERN_WARNING MV_CESA
 920                        "got an interrupt but no pending timer?\n");
 921         }
 922         val &= ~SEC_INT_ACCEL0_DONE;
 923         writel(val, cpg->reg + FPGA_INT_STATUS);
 924         writel(val, cpg->reg + SEC_ACCEL_INT_STATUS);
 925         BUG_ON(cpg->eng_st != ENGINE_BUSY);
 926         cpg->eng_st = ENGINE_W_DEQUEUE;
 927         wake_up_process(cpg->queue_th);
 928         return IRQ_HANDLED;
 929 }
 930
 931 struct crypto_alg mv_aes_alg_ecb = {
 932         .cra_name               = "ecb(aes)",
 933         .cra_driver_name        = "mv-ecb-aes",
 934         .cra_priority   = 300,
 935         .cra_flags      = CRYPTO_ALG_TYPE_ABLKCIPHER |
 936                           CRYPTO_ALG_KERN_DRIVER_ONLY | CRYPTO_ALG_ASYNC,
 937         .cra_blocksize  = 16,
 938         .cra_ctxsize    = sizeof(struct mv_ctx),
 939         .cra_alignmask  = 0,
 940         .cra_type       = &crypto_ablkcipher_type,
 941         .cra_module     = THIS_MODULE,
 942         .cra_init       = mv_cra_init,
 943         .cra_u          = {
 944                 .ablkcipher = {
 945                         .min_keysize    =       AES_MIN_KEY_SIZE,
 946                         .max_keysize    =       AES_MAX_KEY_SIZE,
 947                         .setkey         =       mv_setkey_aes,
 948                         .encrypt        =       mv_enc_aes_ecb,
 949                         .decrypt        =       mv_dec_aes_ecb,
 950                 },
 951         },
 952 };
 953
 954 struct crypto_alg mv_aes_alg_cbc = {
 955         .cra_name               = "cbc(aes)",
 956         .cra_driver_name        = "mv-cbc-aes",
 957         .cra_priority   = 300,
 958         .cra_flags      = CRYPTO_ALG_TYPE_ABLKCIPHER |
 959                           CRYPTO_ALG_KERN_DRIVER_ONLY | CRYPTO_ALG_ASYNC,
 960         .cra_blocksize  = AES_BLOCK_SIZE,
 961         .cra_ctxsize    = sizeof(struct mv_ctx),
 962         .cra_alignmask  = 0,
 963         .cra_type       = &crypto_ablkcipher_type,
 964         .cra_module     = THIS_MODULE,
 965         .cra_init       = mv_cra_init,
 966         .cra_u          = {
 967                 .ablkcipher = {
 968                         .ivsize         =       AES_BLOCK_SIZE,
 969                         .min_keysize    =       AES_MIN_KEY_SIZE,
 970                         .max_keysize    =       AES_MAX_KEY_SIZE,
 971                         .setkey         =       mv_setkey_aes,
 972                         .encrypt        =       mv_enc_aes_cbc,
 973                         .decrypt        =       mv_dec_aes_cbc,
 974                 },
 975         },
 976 };
 977
 978 struct ahash_alg mv_sha1_alg = {
 979         .init = mv_hash_init,
 980         .update = mv_hash_update,
 981         .final = mv_hash_final,
 982         .finup = mv_hash_finup,
 983         .digest = mv_hash_digest,
 984         .halg = {
 985                  .digestsize = SHA1_DIGEST_SIZE,
 986                  .base = {
 987                           .cra_name = "sha1",
 988                           .cra_driver_name = "mv-sha1",
 989                           .cra_priority = 300,
 990                           .cra_flags =
 991                           CRYPTO_ALG_ASYNC | CRYPTO_ALG_KERN_DRIVER_ONLY |
 992                           CRYPTO_ALG_NEED_FALLBACK,
 993                           .cra_blocksize = SHA1_BLOCK_SIZE,
 994                           .cra_ctxsize = sizeof(struct mv_tfm_hash_ctx),
 995                           .cra_init = mv_cra_hash_sha1_init,
 996                           .cra_exit = mv_cra_hash_exit,
 997                           .cra_module = THIS_MODULE,
 998                           }
 999                  }
1000 };
1001
1002 struct ahash_alg mv_hmac_sha1_alg = {
1003         .init = mv_hash_init,
1004         .update = mv_hash_update,
1005         .final = mv_hash_final,
1006         .finup = mv_hash_finup,
1007         .digest = mv_hash_digest,
1008         .setkey = mv_hash_setkey,
1009         .halg = {
1010                  .digestsize = SHA1_DIGEST_SIZE,
1011                  .base = {
1012                           .cra_name = "hmac(sha1)",
1013                           .cra_driver_name = "mv-hmac-sha1",
1014                           .cra_priority = 300,
1015                           .cra_flags =
1016                           CRYPTO_ALG_ASYNC | CRYPTO_ALG_KERN_DRIVER_ONLY |
1017                           CRYPTO_ALG_NEED_FALLBACK,
1018                           .cra_blocksize = SHA1_BLOCK_SIZE,
1019                           .cra_ctxsize = sizeof(struct mv_tfm_hash_ctx),
1020                           .cra_init = mv_cra_hash_hmac_sha1_init,
1021                           .cra_exit = mv_cra_hash_exit,
1022                           .cra_module = THIS_MODULE,
1023                           }
1024                  }
1025 };
1026
1027 static int mv_probe(struct platform_device *pdev)
1028 {
1029         struct crypto_priv *cp;
1030         struct resource *res;
1031         int irq;
1032         int ret;
1033
1034         if (cpg) {
1035                 printk(KERN_ERR MV_CESA "Second crypto dev?\n");
1036                 return -EEXIST;
1037         }
1038
1039         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
1040         if (!res)
1041                 return -ENXIO;
1042
1043         cp = kzalloc(sizeof(*cp), GFP_KERNEL);
1044         if (!cp)
1045                 return -ENOMEM;
1046
1047         spin_lock_init(&cp->lock);
1048         crypto_init_queue(&cp->queue, 50);
1049         cp->reg = ioremap(res->start, resource_size(res));
1050         if (!cp->reg) {
1051                 ret = -ENOMEM;
1052                 goto err;
1053         }
1054
1055         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "sram");
1056         if (!res) {
1057                 ret = -ENXIO;
1058                 goto err_unmap_reg;
1059         }
1060         cp->sram_size = resource_size(res);
1061         cp->max_req_size = cp->sram_size - SRAM_CFG_SPACE;
1062         cp->sram = ioremap(res->start, cp->sram_size);
1063         if (!cp->sram) {
1064                 ret = -ENOMEM;
1065                 goto err_unmap_reg;
1066         }
1067
1068         if (pdev->dev.of_node)
1069                 irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
1070         else
1071                 irq = platform_get_irq(pdev, 0);
1072         if (irq < 0 || irq == NO_IRQ) {
1073                 ret = irq;
1074                 goto err_unmap_sram;
1075         }
1076         cp->irq = irq;
1077
1078         platform_set_drvdata(pdev, cp);
1079         cpg = cp;
1080
1081         cp->queue_th = kthread_run(queue_manag, cp, "mv_crypto");
1082         if (IS_ERR(cp->queue_th)) {
1083                 ret = PTR_ERR(cp->queue_th);
1084                 goto err_unmap_sram;
1085         }
1086
1087         ret = request_irq(irq, crypto_int, IRQF_DISABLED, dev_name(&pdev->dev),
1088                         cp);
1089         if (ret)
1090                 goto err_thread;
1091
1092         /* Not all platforms can gate the clock, so it is not
1093            an error if the clock does not exists. */
1094         cp->clk = clk_get(&pdev->dev, NULL);
1095         if (!IS_ERR(cp->clk))
1096                 clk_prepare_enable(cp->clk);
1097
1098         writel(0, cpg->reg + SEC_ACCEL_INT_STATUS);
1099         writel(SEC_INT_ACCEL0_DONE, cpg->reg + SEC_ACCEL_INT_MASK);
1100         writel(SEC_CFG_STOP_DIG_ERR, cpg->reg + SEC_ACCEL_CFG);
1101         writel(SRAM_CONFIG, cpg->reg + SEC_ACCEL_DESC_P0);
1102
1103         ret = crypto_register_alg(&mv_aes_alg_ecb);
1104         if (ret) {
1105                 printk(KERN_WARNING MV_CESA
1106                        "Could not register aes-ecb driver\n");
1107                 goto err_irq;
1108         }
1109
1110         ret = crypto_register_alg(&mv_aes_alg_cbc);
1111         if (ret) {
1112                 printk(KERN_WARNING MV_CESA
1113                        "Could not register aes-cbc driver\n");
1114                 goto err_unreg_ecb;
1115         }
1116
1117         ret = crypto_register_ahash(&mv_sha1_alg);
1118         if (ret == 0)
1119                 cpg->has_sha1 = 1;
1120         else
1121                 printk(KERN_WARNING MV_CESA "Could not register sha1 driver\n");
1122
1123         ret = crypto_register_ahash(&mv_hmac_sha1_alg);
1124         if (ret == 0) {
1125                 cpg->has_hmac_sha1 = 1;
1126         } else {
1127                 printk(KERN_WARNING MV_CESA
1128                        "Could not register hmac-sha1 driver\n");
1129         }
1130
1131         return 0;
1132 err_unreg_ecb:
1133         crypto_unregister_alg(&mv_aes_alg_ecb);
1134 err_irq:
1135         free_irq(irq, cp);
1136         if (!IS_ERR(cp->clk)) {
1137                 clk_disable_unprepare(cp->clk);
1138                 clk_put(cp->clk);
1139         }
1140 err_thread:
1141         kthread_stop(cp->queue_th);
1142 err_unmap_sram:
1143         iounmap(cp->sram);
1144 err_unmap_reg:
1145         iounmap(cp->reg);
1146 err:
1147         kfree(cp);
1148         cpg = NULL;
1149         return ret;
1150 }
1151
1152 static int mv_remove(struct platform_device *pdev)
1153 {
1154         struct crypto_priv *cp = platform_get_drvdata(pdev);
1155
1156         crypto_unregister_alg(&mv_aes_alg_ecb);
1157         crypto_unregister_alg(&mv_aes_alg_cbc);
1158         if (cp->has_sha1)
1159                 crypto_unregister_ahash(&mv_sha1_alg);
1160         if (cp->has_hmac_sha1)
1161                 crypto_unregister_ahash(&mv_hmac_sha1_alg);
1162         kthread_stop(cp->queue_th);
1163         free_irq(cp->irq, cp);
1164         memset(cp->sram, 0, cp->sram_size);
1165         iounmap(cp->sram);
1166         iounmap(cp->reg);
1167
1168         if (!IS_ERR(cp->clk)) {
1169                 clk_disable_unprepare(cp->clk);
1170                 clk_put(cp->clk);
1171         }
1172
1173         kfree(cp);
1174         cpg = NULL;
1175         return 0;
1176 }
1177
1178 static const struct of_device_id mv_cesa_of_match_table[] = {
1179         { .compatible = "marvell,orion-crypto", },
1180         {}
1181 };
1182 MODULE_DEVICE_TABLE(of, mv_cesa_of_match_table);
1183
1184 static struct platform_driver marvell_crypto = {
1185         .probe          = mv_probe,
1186         .remove         = mv_remove,
1187         .driver         = {
1188                 .owner  = THIS_MODULE,
1189                 .name   = "mv_crypto",
1190                 .of_match_table = of_match_ptr(mv_cesa_of_match_table),
1191         },
1192 };
1193 MODULE_ALIAS("platform:mv_crypto");
1194
1195 module_platform_driver(marvell_crypto);
1196
1197 MODULE_AUTHOR("Sebastian Andrzej Siewior <sebastian@breakpoint.cc>");
1198 MODULE_DESCRIPTION("Support for Marvell's cryptographic engine");
1199 MODULE_LICENSE("GPL");