drivers/crypto/atmel-sha.c

   1 /*
   2  * Cryptographic API.
   3  *
   4  * Support for ATMEL SHA1/SHA256 HW acceleration.
   5  *
   6  * Copyright (c) 2012 Eukréa Electromatique - ATMEL
   7  * Author: Nicolas Royer <nicolas@eukrea.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as published
  11  * by the Free Software Foundation.
  12  *
  13  * Some ideas are from omap-sham.c drivers.
  14  */
  15
  16
  17 #include <linux/kernel.h>
  18 #include <linux/module.h>
  19 #include <linux/slab.h>
  20 #include <linux/err.h>
  21 #include <linux/clk.h>
  22 #include <linux/io.h>
  23 #include <linux/hw_random.h>
  24 #include <linux/platform_device.h>
  25
  26 #include <linux/device.h>
  27 #include <linux/init.h>
  28 #include <linux/errno.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/irq.h>
  31 #include <linux/scatterlist.h>
  32 #include <linux/dma-mapping.h>
  33 #include <linux/of_device.h>
  34 #include <linux/delay.h>
  35 #include <linux/crypto.h>
  36 #include <linux/cryptohash.h>
  37 #include <crypto/scatterwalk.h>
  38 #include <crypto/algapi.h>
  39 #include <crypto/sha.h>
  40 #include <crypto/hash.h>
  41 #include <crypto/internal/hash.h>
  42 #include <linux/platform_data/crypto-atmel.h>
  43 #include "atmel-sha-regs.h"
  44 #include "atmel-authenc.h"
  45
  46 /* SHA flags */
  47 #define SHA_FLAGS_BUSY                  BIT(0)
  48 #define SHA_FLAGS_FINAL                 BIT(1)
  49 #define SHA_FLAGS_DMA_ACTIVE    BIT(2)
  50 #define SHA_FLAGS_OUTPUT_READY  BIT(3)
  51 #define SHA_FLAGS_INIT                  BIT(4)
  52 #define SHA_FLAGS_CPU                   BIT(5)
  53 #define SHA_FLAGS_DMA_READY             BIT(6)
  54 #define SHA_FLAGS_DUMP_REG      BIT(7)
  55
  56 /* bits[11:8] are reserved. */
  57
  58 #define SHA_FLAGS_FINUP         BIT(16)
  59 #define SHA_FLAGS_SG            BIT(17)
  60 #define SHA_FLAGS_ERROR         BIT(23)
  61 #define SHA_FLAGS_PAD           BIT(24)
  62 #define SHA_FLAGS_RESTORE       BIT(25)
  63 #define SHA_FLAGS_IDATAR0       BIT(26)
  64 #define SHA_FLAGS_WAIT_DATARDY  BIT(27)
  65
  66 #define SHA_OP_INIT     0
  67 #define SHA_OP_UPDATE   1
  68 #define SHA_OP_FINAL    2
  69 #define SHA_OP_DIGEST   3
  70
  71 #define SHA_BUFFER_LEN          (PAGE_SIZE / 16)
  72
  73 #define ATMEL_SHA_DMA_THRESHOLD         56
  74
  75 struct atmel_sha_caps {
  76         bool    has_dma;
  77         bool    has_dualbuff;
  78         bool    has_sha224;
  79         bool    has_sha_384_512;
  80         bool    has_uihv;
  81         bool    has_hmac;
  82 };
  83
  84 struct atmel_sha_dev;
  85
  86 /*
  87  * .statesize = sizeof(struct atmel_sha_reqctx) must be <= PAGE_SIZE / 8 as
  88  * tested by the ahash_prepare_alg() function.
  89  */
  90 struct atmel_sha_reqctx {
  91         struct atmel_sha_dev    *dd;
  92         unsigned long   flags;
  93         unsigned long   op;
  94
  95         u8      digest[SHA512_DIGEST_SIZE] __aligned(sizeof(u32));
  96         u64     digcnt[2];
  97         size_t  bufcnt;
  98         size_t  buflen;
  99         dma_addr_t      dma_addr;
 100
 101         /* walk state */
 102         struct scatterlist      *sg;
 103         unsigned int    offset; /* offset in current sg */
 104         unsigned int    total;  /* total request */
 105
 106         size_t block_size;
 107         size_t hash_size;
 108
 109         u8 buffer[SHA_BUFFER_LEN + SHA512_BLOCK_SIZE] __aligned(sizeof(u32));
 110 };
 111
 112 typedef int (*atmel_sha_fn_t)(struct atmel_sha_dev *);
 113
 114 struct atmel_sha_ctx {
 115         struct atmel_sha_dev    *dd;
 116         atmel_sha_fn_t          start;
 117
 118         unsigned long           flags;
 119 };
 120
 121 #define ATMEL_SHA_QUEUE_LENGTH  50
 122
 123 struct atmel_sha_dma {
 124         struct dma_chan                 *chan;
 125         struct dma_slave_config dma_conf;
 126         struct scatterlist      *sg;
 127         int                     nents;
 128         unsigned int            last_sg_length;
 129 };
 130
 131 struct atmel_sha_dev {
 132         struct list_head        list;
 133         unsigned long           phys_base;
 134         struct device           *dev;
 135         struct clk                      *iclk;
 136         int                                     irq;
 137         void __iomem            *io_base;
 138
 139         spinlock_t              lock;
 140         int                     err;
 141         struct tasklet_struct   done_task;
 142         struct tasklet_struct   queue_task;
 143
 144         unsigned long           flags;
 145         struct crypto_queue     queue;
 146         struct ahash_request    *req;
 147         bool                    is_async;
 148         bool                    force_complete;
 149         atmel_sha_fn_t          resume;
 150         atmel_sha_fn_t          cpu_transfer_complete;
 151
 152         struct atmel_sha_dma    dma_lch_in;
 153
 154         struct atmel_sha_caps   caps;
 155
 156         struct scatterlist      tmp;
 157
 158         u32     hw_version;
 159 };
 160
 161 struct atmel_sha_drv {
 162         struct list_head        dev_list;
 163         spinlock_t              lock;
 164 };
 165
 166 static struct atmel_sha_drv atmel_sha = {
 167         .dev_list = LIST_HEAD_INIT(atmel_sha.dev_list),
 168         .lock = __SPIN_LOCK_UNLOCKED(atmel_sha.lock),
 169 };
 170
 171 #ifdef VERBOSE_DEBUG
 172 static const char *atmel_sha_reg_name(u32 offset, char *tmp, size_t sz, bool wr)
 173 {
 174         switch (offset) {
 175         case SHA_CR:
 176                 return "CR";
 177
 178         case SHA_MR:
 179                 return "MR";
 180
 181         case SHA_IER:
 182                 return "IER";
 183
 184         case SHA_IDR:
 185                 return "IDR";
 186
 187         case SHA_IMR:
 188                 return "IMR";
 189
 190         case SHA_ISR:
 191                 return "ISR";
 192
 193         case SHA_MSR:
 194                 return "MSR";
 195
 196         case SHA_BCR:
 197                 return "BCR";
 198
 199         case SHA_REG_DIN(0):
 200         case SHA_REG_DIN(1):
 201         case SHA_REG_DIN(2):
 202         case SHA_REG_DIN(3):
 203         case SHA_REG_DIN(4):
 204         case SHA_REG_DIN(5):
 205         case SHA_REG_DIN(6):
 206         case SHA_REG_DIN(7):
 207         case SHA_REG_DIN(8):
 208         case SHA_REG_DIN(9):
 209         case SHA_REG_DIN(10):
 210         case SHA_REG_DIN(11):
 211         case SHA_REG_DIN(12):
 212         case SHA_REG_DIN(13):
 213         case SHA_REG_DIN(14):
 214         case SHA_REG_DIN(15):
 215                 snprintf(tmp, sz, "IDATAR[%u]", (offset - SHA_REG_DIN(0)) >> 2);
 216                 break;
 217
 218         case SHA_REG_DIGEST(0):
 219         case SHA_REG_DIGEST(1):
 220         case SHA_REG_DIGEST(2):
 221         case SHA_REG_DIGEST(3):
 222         case SHA_REG_DIGEST(4):
 223         case SHA_REG_DIGEST(5):
 224         case SHA_REG_DIGEST(6):
 225         case SHA_REG_DIGEST(7):
 226         case SHA_REG_DIGEST(8):
 227         case SHA_REG_DIGEST(9):
 228         case SHA_REG_DIGEST(10):
 229         case SHA_REG_DIGEST(11):
 230         case SHA_REG_DIGEST(12):
 231         case SHA_REG_DIGEST(13):
 232         case SHA_REG_DIGEST(14):
 233         case SHA_REG_DIGEST(15):
 234                 if (wr)
 235                         snprintf(tmp, sz, "IDATAR[%u]",
 236                                  16u + ((offset - SHA_REG_DIGEST(0)) >> 2));
 237                 else
 238                         snprintf(tmp, sz, "ODATAR[%u]",
 239                                  (offset - SHA_REG_DIGEST(0)) >> 2);
 240                 break;
 241
 242         case SHA_HW_VERSION:
 243                 return "HWVER";
 244
 245         default:
 246                 snprintf(tmp, sz, "0x%02x", offset);
 247                 break;
 248         }
 249
 250         return tmp;
 251 }
 252
 253 #endif /* VERBOSE_DEBUG */
 254
 255 static inline u32 atmel_sha_read(struct atmel_sha_dev *dd, u32 offset)
 256 {
 257         u32 value = readl_relaxed(dd->io_base + offset);
 258
 259 #ifdef VERBOSE_DEBUG
 260         if (dd->flags & SHA_FLAGS_DUMP_REG) {
 261                 char tmp[16];
 262
 263                 dev_vdbg(dd->dev, "read 0x%08x from %s\n", value,
 264                          atmel_sha_reg_name(offset, tmp, sizeof(tmp), false));
 265         }
 266 #endif /* VERBOSE_DEBUG */
 267
 268         return value;
 269 }
 270
 271 static inline void atmel_sha_write(struct atmel_sha_dev *dd,
 272                                         u32 offset, u32 value)
 273 {
 274 #ifdef VERBOSE_DEBUG
 275         if (dd->flags & SHA_FLAGS_DUMP_REG) {
 276                 char tmp[16];
 277
 278                 dev_vdbg(dd->dev, "write 0x%08x into %s\n", value,
 279                          atmel_sha_reg_name(offset, tmp, sizeof(tmp), true));
 280         }
 281 #endif /* VERBOSE_DEBUG */
 282
 283         writel_relaxed(value, dd->io_base + offset);
 284 }
 285
 286 static inline int atmel_sha_complete(struct atmel_sha_dev *dd, int err)
 287 {
 288         struct ahash_request *req = dd->req;
 289
 290         dd->flags &= ~(SHA_FLAGS_BUSY | SHA_FLAGS_FINAL | SHA_FLAGS_CPU |
 291                        SHA_FLAGS_DMA_READY | SHA_FLAGS_OUTPUT_READY |
 292                        SHA_FLAGS_DUMP_REG);
 293
 294         clk_disable(dd->iclk);
 295
 296         if ((dd->is_async || dd->force_complete) && req->base.complete)
 297                 req->base.complete(&req->base, err);
 298
 299         /* handle new request */
 300         tasklet_schedule(&dd->queue_task);
 301
 302         return err;
 303 }
 304
 305 static size_t atmel_sha_append_sg(struct atmel_sha_reqctx *ctx)
 306 {
 307         size_t count;
 308
 309         while ((ctx->bufcnt < ctx->buflen) && ctx->total) {
 310                 count = min(ctx->sg->length - ctx->offset, ctx->total);
 311                 count = min(count, ctx->buflen - ctx->bufcnt);
 312
 313                 if (count <= 0) {
 314                         /*
 315                         * Check if count <= 0 because the buffer is full or
 316                         * because the sg length is 0. In the latest case,
 317                         * check if there is another sg in the list, a 0 length
 318                         * sg doesn't necessarily mean the end of the sg list.
 319                         */
 320                         if ((ctx->sg->length == 0) && !sg_is_last(ctx->sg)) {
 321                                 ctx->sg = sg_next(ctx->sg);
 322                                 continue;
 323                         } else {
 324                                 break;
 325                         }
 326                 }
 327
 328                 scatterwalk_map_and_copy(ctx->buffer + ctx->bufcnt, ctx->sg,
 329                         ctx->offset, count, 0);
 330
 331                 ctx->bufcnt += count;
 332                 ctx->offset += count;
 333                 ctx->total -= count;
 334
 335                 if (ctx->offset == ctx->sg->length) {
 336                         ctx->sg = sg_next(ctx->sg);
 337                         if (ctx->sg)
 338                                 ctx->offset = 0;
 339                         else
 340                                 ctx->total = 0;
 341                 }
 342         }
 343
 344         return 0;
 345 }
 346
 347 /*
 348  * The purpose of this padding is to ensure that the padded message is a
 349  * multiple of 512 bits (SHA1/SHA224/SHA256) or 1024 bits (SHA384/SHA512).
 350  * The bit "1" is appended at the end of the message followed by
 351  * "padlen-1" zero bits. Then a 64 bits block (SHA1/SHA224/SHA256) or
 352  * 128 bits block (SHA384/SHA512) equals to the message length in bits
 353  * is appended.
 354  *
 355  * For SHA1/SHA224/SHA256, padlen is calculated as followed:
 356  *  - if message length < 56 bytes then padlen = 56 - message length
 357  *  - else padlen = 64 + 56 - message length
 358  *
 359  * For SHA384/SHA512, padlen is calculated as followed:
 360  *  - if message length < 112 bytes then padlen = 112 - message length
 361  *  - else padlen = 128 + 112 - message length
 362  */
 363 static void atmel_sha_fill_padding(struct atmel_sha_reqctx *ctx, int length)
 364 {
 365         unsigned int index, padlen;
 366         u64 bits[2];
 367         u64 size[2];
 368
 369         size[0] = ctx->digcnt[0];
 370         size[1] = ctx->digcnt[1];
 371
 372         size[0] += ctx->bufcnt;
 373         if (size[0] < ctx->bufcnt)
 374                 size[1]++;
 375
 376         size[0] += length;
 377         if (size[0]  < length)
 378                 size[1]++;
 379
 380         bits[1] = cpu_to_be64(size[0] << 3);
 381         bits[0] = cpu_to_be64(size[1] << 3 | size[0] >> 61);
 382
 383         switch (ctx->flags & SHA_FLAGS_ALGO_MASK) {
 384         case SHA_FLAGS_SHA384:
 385         case SHA_FLAGS_SHA512:
 386                 index = ctx->bufcnt & 0x7f;
 387                 padlen = (index < 112) ? (112 - index) : ((128+112) - index);
 388                 *(ctx->buffer + ctx->bufcnt) = 0x80;
 389                 memset(ctx->buffer + ctx->bufcnt + 1, 0, padlen-1);
 390                 memcpy(ctx->buffer + ctx->bufcnt + padlen, bits, 16);
 391                 ctx->bufcnt += padlen + 16;
 392                 ctx->flags |= SHA_FLAGS_PAD;
 393                 break;
 394
 395         default:
 396                 index = ctx->bufcnt & 0x3f;
 397                 padlen = (index < 56) ? (56 - index) : ((64+56) - index);
 398                 *(ctx->buffer + ctx->bufcnt) = 0x80;
 399                 memset(ctx->buffer + ctx->bufcnt + 1, 0, padlen-1);
 400                 memcpy(ctx->buffer + ctx->bufcnt + padlen, &bits[1], 8);
 401                 ctx->bufcnt += padlen + 8;
 402                 ctx->flags |= SHA_FLAGS_PAD;
 403                 break;
 404         }
 405 }
 406
 407 static struct atmel_sha_dev *atmel_sha_find_dev(struct atmel_sha_ctx *tctx)
 408 {
 409         struct atmel_sha_dev *dd = NULL;
 410         struct atmel_sha_dev *tmp;
 411
 412         spin_lock_bh(&atmel_sha.lock);
 413         if (!tctx->dd) {
 414                 list_for_each_entry(tmp, &atmel_sha.dev_list, list) {
 415                         dd = tmp;
 416                         break;
 417                 }
 418                 tctx->dd = dd;
 419         } else {
 420                 dd = tctx->dd;
 421         }
 422
 423         spin_unlock_bh(&atmel_sha.lock);
 424
 425         return dd;
 426 }
 427
 428 static int atmel_sha_init(struct ahash_request *req)
 429 {
 430         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 431         struct atmel_sha_ctx *tctx = crypto_ahash_ctx(tfm);
 432         struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
 433         struct atmel_sha_dev *dd = atmel_sha_find_dev(tctx);
 434
 435         ctx->dd = dd;
 436
 437         ctx->flags = 0;
 438
 439         dev_dbg(dd->dev, "init: digest size: %d\n",
 440                 crypto_ahash_digestsize(tfm));
 441
 442         switch (crypto_ahash_digestsize(tfm)) {
 443         case SHA1_DIGEST_SIZE:
 444                 ctx->flags |= SHA_FLAGS_SHA1;
 445                 ctx->block_size = SHA1_BLOCK_SIZE;
 446                 break;
 447         case SHA224_DIGEST_SIZE:
 448                 ctx->flags |= SHA_FLAGS_SHA224;
 449                 ctx->block_size = SHA224_BLOCK_SIZE;
 450                 break;
 451         case SHA256_DIGEST_SIZE:
 452                 ctx->flags |= SHA_FLAGS_SHA256;
 453                 ctx->block_size = SHA256_BLOCK_SIZE;
 454                 break;
 455         case SHA384_DIGEST_SIZE:
 456                 ctx->flags |= SHA_FLAGS_SHA384;
 457                 ctx->block_size = SHA384_BLOCK_SIZE;
 458                 break;
 459         case SHA512_DIGEST_SIZE:
 460                 ctx->flags |= SHA_FLAGS_SHA512;
 461                 ctx->block_size = SHA512_BLOCK_SIZE;
 462                 break;
 463         default:
 464                 return -EINVAL;
 465                 break;
 466         }
 467
 468         ctx->bufcnt = 0;
 469         ctx->digcnt[0] = 0;
 470         ctx->digcnt[1] = 0;
 471         ctx->buflen = SHA_BUFFER_LEN;
 472
 473         return 0;
 474 }
 475
 476 static void atmel_sha_write_ctrl(struct atmel_sha_dev *dd, int dma)
 477 {
 478         struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
 479         u32 valmr = SHA_MR_MODE_AUTO;
 480         unsigned int i, hashsize = 0;
 481
 482         if (likely(dma)) {
 483                 if (!dd->caps.has_dma)
 484                         atmel_sha_write(dd, SHA_IER, SHA_INT_TXBUFE);
 485                 valmr = SHA_MR_MODE_PDC;
 486                 if (dd->caps.has_dualbuff)
 487                         valmr |= SHA_MR_DUALBUFF;
 488         } else {
 489                 atmel_sha_write(dd, SHA_IER, SHA_INT_DATARDY);
 490         }
 491
 492         switch (ctx->flags & SHA_FLAGS_ALGO_MASK) {
 493         case SHA_FLAGS_SHA1:
 494                 valmr |= SHA_MR_ALGO_SHA1;
 495                 hashsize = SHA1_DIGEST_SIZE;
 496                 break;
 497
 498         case SHA_FLAGS_SHA224:
 499                 valmr |= SHA_MR_ALGO_SHA224;
 500                 hashsize = SHA256_DIGEST_SIZE;
 501                 break;
 502
 503         case SHA_FLAGS_SHA256:
 504                 valmr |= SHA_MR_ALGO_SHA256;
 505                 hashsize = SHA256_DIGEST_SIZE;
 506                 break;
 507
 508         case SHA_FLAGS_SHA384:
 509                 valmr |= SHA_MR_ALGO_SHA384;
 510                 hashsize = SHA512_DIGEST_SIZE;
 511                 break;
 512
 513         case SHA_FLAGS_SHA512:
 514                 valmr |= SHA_MR_ALGO_SHA512;
 515                 hashsize = SHA512_DIGEST_SIZE;
 516                 break;
 517
 518         default:
 519                 break;
 520         }
 521
 522         /* Setting CR_FIRST only for the first iteration */
 523         if (!(ctx->digcnt[0] || ctx->digcnt[1])) {
 524                 atmel_sha_write(dd, SHA_CR, SHA_CR_FIRST);
 525         } else if (dd->caps.has_uihv && (ctx->flags & SHA_FLAGS_RESTORE)) {
 526                 const u32 *hash = (const u32 *)ctx->digest;
 527
 528                 /*
 529                  * Restore the hardware context: update the User Initialize
 530                  * Hash Value (UIHV) with the value saved when the latest
 531                  * 'update' operation completed on this very same crypto
 532                  * request.
 533                  */
 534                 ctx->flags &= ~SHA_FLAGS_RESTORE;
 535                 atmel_sha_write(dd, SHA_CR, SHA_CR_WUIHV);
 536                 for (i = 0; i < hashsize / sizeof(u32); ++i)
 537                         atmel_sha_write(dd, SHA_REG_DIN(i), hash[i]);
 538                 atmel_sha_write(dd, SHA_CR, SHA_CR_FIRST);
 539                 valmr |= SHA_MR_UIHV;
 540         }
 541         /*
 542          * WARNING: If the UIHV feature is not available, the hardware CANNOT
 543          * process concurrent requests: the internal registers used to store
 544          * the hash/digest are still set to the partial digest output values
 545          * computed during the latest round.
 546          */
 547
 548         atmel_sha_write(dd, SHA_MR, valmr);
 549 }
 550
 551 static inline int atmel_sha_wait_for_data_ready(struct atmel_sha_dev *dd,
 552                                                 atmel_sha_fn_t resume)
 553 {
 554         u32 isr = atmel_sha_read(dd, SHA_ISR);
 555
 556         if (unlikely(isr & SHA_INT_DATARDY))
 557                 return resume(dd);
 558
 559         dd->resume = resume;
 560         atmel_sha_write(dd, SHA_IER, SHA_INT_DATARDY);
 561         return -EINPROGRESS;
 562 }
 563
 564 static int atmel_sha_xmit_cpu(struct atmel_sha_dev *dd, const u8 *buf,
 565                               size_t length, int final)
 566 {
 567         struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
 568         int count, len32;
 569         const u32 *buffer = (const u32 *)buf;
 570
 571         dev_dbg(dd->dev, "xmit_cpu: digcnt: 0x%llx 0x%llx, length: %zd, final: %d\n",
 572                 ctx->digcnt[1], ctx->digcnt[0], length, final);
 573
 574         atmel_sha_write_ctrl(dd, 0);
 575
 576         /* should be non-zero before next lines to disable clocks later */
 577         ctx->digcnt[0] += length;
 578         if (ctx->digcnt[0] < length)
 579                 ctx->digcnt[1]++;
 580
 581         if (final)
 582                 dd->flags |= SHA_FLAGS_FINAL; /* catch last interrupt */
 583
 584         len32 = DIV_ROUND_UP(length, sizeof(u32));
 585
 586         dd->flags |= SHA_FLAGS_CPU;
 587
 588         for (count = 0; count < len32; count++)
 589                 atmel_sha_write(dd, SHA_REG_DIN(count), buffer[count]);
 590
 591         return -EINPROGRESS;
 592 }
 593
 594 static int atmel_sha_xmit_pdc(struct atmel_sha_dev *dd, dma_addr_t dma_addr1,
 595                 size_t length1, dma_addr_t dma_addr2, size_t length2, int final)
 596 {
 597         struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
 598         int len32;
 599
 600         dev_dbg(dd->dev, "xmit_pdc: digcnt: 0x%llx 0x%llx, length: %zd, final: %d\n",
 601                 ctx->digcnt[1], ctx->digcnt[0], length1, final);
 602
 603         len32 = DIV_ROUND_UP(length1, sizeof(u32));
 604         atmel_sha_write(dd, SHA_PTCR, SHA_PTCR_TXTDIS);
 605         atmel_sha_write(dd, SHA_TPR, dma_addr1);
 606         atmel_sha_write(dd, SHA_TCR, len32);
 607
 608         len32 = DIV_ROUND_UP(length2, sizeof(u32));
 609         atmel_sha_write(dd, SHA_TNPR, dma_addr2);
 610         atmel_sha_write(dd, SHA_TNCR, len32);
 611
 612         atmel_sha_write_ctrl(dd, 1);
 613
 614         /* should be non-zero before next lines to disable clocks later */
 615         ctx->digcnt[0] += length1;
 616         if (ctx->digcnt[0] < length1)
 617                 ctx->digcnt[1]++;
 618
 619         if (final)
 620                 dd->flags |= SHA_FLAGS_FINAL; /* catch last interrupt */
 621
 622         dd->flags |=  SHA_FLAGS_DMA_ACTIVE;
 623
 624         /* Start DMA transfer */
 625         atmel_sha_write(dd, SHA_PTCR, SHA_PTCR_TXTEN);
 626
 627         return -EINPROGRESS;
 628 }
 629
 630 static void atmel_sha_dma_callback(void *data)
 631 {
 632         struct atmel_sha_dev *dd = data;
 633
 634         dd->is_async = true;
 635
 636         /* dma_lch_in - completed - wait DATRDY */
 637         atmel_sha_write(dd, SHA_IER, SHA_INT_DATARDY);
 638 }
 639
 640 static int atmel_sha_xmit_dma(struct atmel_sha_dev *dd, dma_addr_t dma_addr1,
 641                 size_t length1, dma_addr_t dma_addr2, size_t length2, int final)
 642 {
 643         struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
 644         struct dma_async_tx_descriptor  *in_desc;
 645         struct scatterlist sg[2];
 646
 647         dev_dbg(dd->dev, "xmit_dma: digcnt: 0x%llx 0x%llx, length: %zd, final: %d\n",
 648                 ctx->digcnt[1], ctx->digcnt[0], length1, final);
 649
 650         dd->dma_lch_in.dma_conf.src_maxburst = 16;
 651         dd->dma_lch_in.dma_conf.dst_maxburst = 16;
 652
 653         dmaengine_slave_config(dd->dma_lch_in.chan, &dd->dma_lch_in.dma_conf);
 654
 655         if (length2) {
 656                 sg_init_table(sg, 2);
 657                 sg_dma_address(&sg[0]) = dma_addr1;
 658                 sg_dma_len(&sg[0]) = length1;
 659                 sg_dma_address(&sg[1]) = dma_addr2;
 660                 sg_dma_len(&sg[1]) = length2;
 661                 in_desc = dmaengine_prep_slave_sg(dd->dma_lch_in.chan, sg, 2,
 662                         DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 663         } else {
 664                 sg_init_table(sg, 1);
 665                 sg_dma_address(&sg[0]) = dma_addr1;
 666                 sg_dma_len(&sg[0]) = length1;
 667                 in_desc = dmaengine_prep_slave_sg(dd->dma_lch_in.chan, sg, 1,
 668                         DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 669         }
 670         if (!in_desc)
 671                 return atmel_sha_complete(dd, -EINVAL);
 672
 673         in_desc->callback = atmel_sha_dma_callback;
 674         in_desc->callback_param = dd;
 675
 676         atmel_sha_write_ctrl(dd, 1);
 677
 678         /* should be non-zero before next lines to disable clocks later */
 679         ctx->digcnt[0] += length1;
 680         if (ctx->digcnt[0] < length1)
 681                 ctx->digcnt[1]++;
 682
 683         if (final)
 684                 dd->flags |= SHA_FLAGS_FINAL; /* catch last interrupt */
 685
 686         dd->flags |=  SHA_FLAGS_DMA_ACTIVE;
 687
 688         /* Start DMA transfer */
 689         dmaengine_submit(in_desc);
 690         dma_async_issue_pending(dd->dma_lch_in.chan);
 691
 692         return -EINPROGRESS;
 693 }
 694
 695 static int atmel_sha_xmit_start(struct atmel_sha_dev *dd, dma_addr_t dma_addr1,
 696                 size_t length1, dma_addr_t dma_addr2, size_t length2, int final)
 697 {
 698         if (dd->caps.has_dma)
 699                 return atmel_sha_xmit_dma(dd, dma_addr1, length1,
 700                                 dma_addr2, length2, final);
 701         else
 702                 return atmel_sha_xmit_pdc(dd, dma_addr1, length1,
 703                                 dma_addr2, length2, final);
 704 }
 705
 706 static int atmel_sha_update_cpu(struct atmel_sha_dev *dd)
 707 {
 708         struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
 709         int bufcnt;
 710
 711         atmel_sha_append_sg(ctx);
 712         atmel_sha_fill_padding(ctx, 0);
 713         bufcnt = ctx->bufcnt;
 714         ctx->bufcnt = 0;
 715
 716         return atmel_sha_xmit_cpu(dd, ctx->buffer, bufcnt, 1);
 717 }
 718
 719 static int atmel_sha_xmit_dma_map(struct atmel_sha_dev *dd,
 720                                         struct atmel_sha_reqctx *ctx,
 721                                         size_t length, int final)
 722 {
 723         ctx->dma_addr = dma_map_single(dd->dev, ctx->buffer,
 724                                 ctx->buflen + ctx->block_size, DMA_TO_DEVICE);
 725         if (dma_mapping_error(dd->dev, ctx->dma_addr)) {
 726                 dev_err(dd->dev, "dma %zu bytes error\n", ctx->buflen +
 727                                 ctx->block_size);
 728                 return atmel_sha_complete(dd, -EINVAL);
 729         }
 730
 731         ctx->flags &= ~SHA_FLAGS_SG;
 732
 733         /* next call does not fail... so no unmap in the case of error */
 734         return atmel_sha_xmit_start(dd, ctx->dma_addr, length, 0, 0, final);
 735 }
 736
 737 static int atmel_sha_update_dma_slow(struct atmel_sha_dev *dd)
 738 {
 739         struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
 740         unsigned int final;
 741         size_t count;
 742
 743         atmel_sha_append_sg(ctx);
 744
 745         final = (ctx->flags & SHA_FLAGS_FINUP) && !ctx->total;
 746
 747         dev_dbg(dd->dev, "slow: bufcnt: %zu, digcnt: 0x%llx 0x%llx, final: %d\n",
 748                  ctx->bufcnt, ctx->digcnt[1], ctx->digcnt[0], final);
 749
 750         if (final)
 751                 atmel_sha_fill_padding(ctx, 0);
 752
 753         if (final || (ctx->bufcnt == ctx->buflen)) {
 754                 count = ctx->bufcnt;
 755                 ctx->bufcnt = 0;
 756                 return atmel_sha_xmit_dma_map(dd, ctx, count, final);
 757         }
 758
 759         return 0;
 760 }
 761
 762 static int atmel_sha_update_dma_start(struct atmel_sha_dev *dd)
 763 {
 764         struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
 765         unsigned int length, final, tail;
 766         struct scatterlist *sg;
 767         unsigned int count;
 768
 769         if (!ctx->total)
 770                 return 0;
 771
 772         if (ctx->bufcnt || ctx->offset)
 773                 return atmel_sha_update_dma_slow(dd);
 774
 775         dev_dbg(dd->dev, "fast: digcnt: 0x%llx 0x%llx, bufcnt: %zd, total: %u\n",
 776                 ctx->digcnt[1], ctx->digcnt[0], ctx->bufcnt, ctx->total);
 777
 778         sg = ctx->sg;
 779
 780         if (!IS_ALIGNED(sg->offset, sizeof(u32)))
 781                 return atmel_sha_update_dma_slow(dd);
 782
 783         if (!sg_is_last(sg) && !IS_ALIGNED(sg->length, ctx->block_size))
 784                 /* size is not ctx->block_size aligned */
 785                 return atmel_sha_update_dma_slow(dd);
 786
 787         length = min(ctx->total, sg->length);
 788
 789         if (sg_is_last(sg)) {
 790                 if (!(ctx->flags & SHA_FLAGS_FINUP)) {
 791                         /* not last sg must be ctx->block_size aligned */
 792                         tail = length & (ctx->block_size - 1);
 793                         length -= tail;
 794                 }
 795         }
 796
 797         ctx->total -= length;
 798         ctx->offset = length; /* offset where to start slow */
 799
 800         final = (ctx->flags & SHA_FLAGS_FINUP) && !ctx->total;
 801
 802         /* Add padding */
 803         if (final) {
 804                 tail = length & (ctx->block_size - 1);
 805                 length -= tail;
 806                 ctx->total += tail;
 807                 ctx->offset = length; /* offset where to start slow */
 808
 809                 sg = ctx->sg;
 810                 atmel_sha_append_sg(ctx);
 811
 812                 atmel_sha_fill_padding(ctx, length);
 813
 814                 ctx->dma_addr = dma_map_single(dd->dev, ctx->buffer,
 815                         ctx->buflen + ctx->block_size, DMA_TO_DEVICE);
 816                 if (dma_mapping_error(dd->dev, ctx->dma_addr)) {
 817                         dev_err(dd->dev, "dma %zu bytes error\n",
 818                                 ctx->buflen + ctx->block_size);
 819                         return atmel_sha_complete(dd, -EINVAL);
 820                 }
 821
 822                 if (length == 0) {
 823                         ctx->flags &= ~SHA_FLAGS_SG;
 824                         count = ctx->bufcnt;
 825                         ctx->bufcnt = 0;
 826                         return atmel_sha_xmit_start(dd, ctx->dma_addr, count, 0,
 827                                         0, final);
 828                 } else {
 829                         ctx->sg = sg;
 830                         if (!dma_map_sg(dd->dev, ctx->sg, 1,
 831                                 DMA_TO_DEVICE)) {
 832                                         dev_err(dd->dev, "dma_map_sg  error\n");
 833                                         return atmel_sha_complete(dd, -EINVAL);
 834                         }
 835
 836                         ctx->flags |= SHA_FLAGS_SG;
 837
 838                         count = ctx->bufcnt;
 839                         ctx->bufcnt = 0;
 840                         return atmel_sha_xmit_start(dd, sg_dma_address(ctx->sg),
 841                                         length, ctx->dma_addr, count, final);
 842                 }
 843         }
 844
 845         if (!dma_map_sg(dd->dev, ctx->sg, 1, DMA_TO_DEVICE)) {
 846                 dev_err(dd->dev, "dma_map_sg  error\n");
 847                 return atmel_sha_complete(dd, -EINVAL);
 848         }
 849
 850         ctx->flags |= SHA_FLAGS_SG;
 851
 852         /* next call does not fail... so no unmap in the case of error */
 853         return atmel_sha_xmit_start(dd, sg_dma_address(ctx->sg), length, 0,
 854                                                                 0, final);
 855 }
 856
 857 static int atmel_sha_update_dma_stop(struct atmel_sha_dev *dd)
 858 {
 859         struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
 860
 861         if (ctx->flags & SHA_FLAGS_SG) {
 862                 dma_unmap_sg(dd->dev, ctx->sg, 1, DMA_TO_DEVICE);
 863                 if (ctx->sg->length == ctx->offset) {
 864                         ctx->sg = sg_next(ctx->sg);
 865                         if (ctx->sg)
 866                                 ctx->offset = 0;
 867                 }
 868                 if (ctx->flags & SHA_FLAGS_PAD) {
 869                         dma_unmap_single(dd->dev, ctx->dma_addr,
 870                                 ctx->buflen + ctx->block_size, DMA_TO_DEVICE);
 871                 }
 872         } else {
 873                 dma_unmap_single(dd->dev, ctx->dma_addr, ctx->buflen +
 874                                                 ctx->block_size, DMA_TO_DEVICE);
 875         }
 876
 877         return 0;
 878 }
 879
 880 static int atmel_sha_update_req(struct atmel_sha_dev *dd)
 881 {
 882         struct ahash_request *req = dd->req;
 883         struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
 884         int err;
 885
 886         dev_dbg(dd->dev, "update_req: total: %u, digcnt: 0x%llx 0x%llx\n",
 887                 ctx->total, ctx->digcnt[1], ctx->digcnt[0]);
 888
 889         if (ctx->flags & SHA_FLAGS_CPU)
 890                 err = atmel_sha_update_cpu(dd);
 891         else
 892                 err = atmel_sha_update_dma_start(dd);
 893
 894         /* wait for dma completion before can take more data */
 895         dev_dbg(dd->dev, "update: err: %d, digcnt: 0x%llx 0%llx\n",
 896                         err, ctx->digcnt[1], ctx->digcnt[0]);
 897
 898         return err;
 899 }
 900
 901 static int atmel_sha_final_req(struct atmel_sha_dev *dd)
 902 {
 903         struct ahash_request *req = dd->req;
 904         struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
 905         int err = 0;
 906         int count;
 907
 908         if (ctx->bufcnt >= ATMEL_SHA_DMA_THRESHOLD) {
 909                 atmel_sha_fill_padding(ctx, 0);
 910                 count = ctx->bufcnt;
 911                 ctx->bufcnt = 0;
 912                 err = atmel_sha_xmit_dma_map(dd, ctx, count, 1);
 913         }
 914         /* faster to handle last block with cpu */
 915         else {
 916                 atmel_sha_fill_padding(ctx, 0);
 917                 count = ctx->bufcnt;
 918                 ctx->bufcnt = 0;
 919                 err = atmel_sha_xmit_cpu(dd, ctx->buffer, count, 1);
 920         }
 921
 922         dev_dbg(dd->dev, "final_req: err: %d\n", err);
 923
 924         return err;
 925 }
 926
 927 static void atmel_sha_copy_hash(struct ahash_request *req)
 928 {
 929         struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
 930         u32 *hash = (u32 *)ctx->digest;
 931         unsigned int i, hashsize;
 932
 933         switch (ctx->flags & SHA_FLAGS_ALGO_MASK) {
 934         case SHA_FLAGS_SHA1:
 935                 hashsize = SHA1_DIGEST_SIZE;
 936                 break;
 937
 938         case SHA_FLAGS_SHA224:
 939         case SHA_FLAGS_SHA256:
 940                 hashsize = SHA256_DIGEST_SIZE;
 941                 break;
 942
 943         case SHA_FLAGS_SHA384:
 944         case SHA_FLAGS_SHA512:
 945                 hashsize = SHA512_DIGEST_SIZE;
 946                 break;
 947
 948         default:
 949                 /* Should not happen... */
 950                 return;
 951         }
 952
 953         for (i = 0; i < hashsize / sizeof(u32); ++i)
 954                 hash[i] = atmel_sha_read(ctx->dd, SHA_REG_DIGEST(i));
 955         ctx->flags |= SHA_FLAGS_RESTORE;
 956 }
 957
 958 static void atmel_sha_copy_ready_hash(struct ahash_request *req)
 959 {
 960         struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
 961
 962         if (!req->result)
 963                 return;
 964
 965         switch (ctx->flags & SHA_FLAGS_ALGO_MASK) {
 966         default:
 967         case SHA_FLAGS_SHA1:
 968                 memcpy(req->result, ctx->digest, SHA1_DIGEST_SIZE);
 969                 break;
 970
 971         case SHA_FLAGS_SHA224:
 972                 memcpy(req->result, ctx->digest, SHA224_DIGEST_SIZE);
 973                 break;
 974
 975         case SHA_FLAGS_SHA256:
 976                 memcpy(req->result, ctx->digest, SHA256_DIGEST_SIZE);
 977                 break;
 978
 979         case SHA_FLAGS_SHA384:
 980                 memcpy(req->result, ctx->digest, SHA384_DIGEST_SIZE);
 981                 break;
 982
 983         case SHA_FLAGS_SHA512:
 984                 memcpy(req->result, ctx->digest, SHA512_DIGEST_SIZE);
 985                 break;
 986         }
 987 }
 988
 989 static int atmel_sha_finish(struct ahash_request *req)
 990 {
 991         struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
 992         struct atmel_sha_dev *dd = ctx->dd;
 993
 994         if (ctx->digcnt[0] || ctx->digcnt[1])
 995                 atmel_sha_copy_ready_hash(req);
 996
 997         dev_dbg(dd->dev, "digcnt: 0x%llx 0x%llx, bufcnt: %zd\n", ctx->digcnt[1],
 998                 ctx->digcnt[0], ctx->bufcnt);
 999
1000         return 0;
1001 }
1002
1003 static void atmel_sha_finish_req(struct ahash_request *req, int err)
1004 {
1005         struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1006         struct atmel_sha_dev *dd = ctx->dd;
1007
1008         if (!err) {
1009                 atmel_sha_copy_hash(req);
1010                 if (SHA_FLAGS_FINAL & dd->flags)
1011                         err = atmel_sha_finish(req);
1012         } else {
1013                 ctx->flags |= SHA_FLAGS_ERROR;
1014         }
1015
1016         /* atomic operation is not needed here */
1017         (void)atmel_sha_complete(dd, err);
1018 }
1019
1020 static int atmel_sha_hw_init(struct atmel_sha_dev *dd)
1021 {
1022         int err;
1023
1024         err = clk_enable(dd->iclk);
1025         if (err)
1026                 return err;
1027
1028         if (!(SHA_FLAGS_INIT & dd->flags)) {
1029                 atmel_sha_write(dd, SHA_CR, SHA_CR_SWRST);
1030                 dd->flags |= SHA_FLAGS_INIT;
1031                 dd->err = 0;
1032         }
1033
1034         return 0;
1035 }
1036
1037 static inline unsigned int atmel_sha_get_version(struct atmel_sha_dev *dd)
1038 {
1039         return atmel_sha_read(dd, SHA_HW_VERSION) & 0x00000fff;
1040 }
1041
1042 static void atmel_sha_hw_version_init(struct atmel_sha_dev *dd)
1043 {
1044         atmel_sha_hw_init(dd);
1045
1046         dd->hw_version = atmel_sha_get_version(dd);
1047
1048         dev_info(dd->dev,
1049                         "version: 0x%x\n", dd->hw_version);
1050
1051         clk_disable(dd->iclk);
1052 }
1053
1054 static int atmel_sha_handle_queue(struct atmel_sha_dev *dd,
1055                                   struct ahash_request *req)
1056 {
1057         struct crypto_async_request *async_req, *backlog;
1058         struct atmel_sha_ctx *ctx;
1059         unsigned long flags;
1060         bool start_async;
1061         int err = 0, ret = 0;
1062
1063         spin_lock_irqsave(&dd->lock, flags);
1064         if (req)
1065                 ret = ahash_enqueue_request(&dd->queue, req);
1066
1067         if (SHA_FLAGS_BUSY & dd->flags) {
1068                 spin_unlock_irqrestore(&dd->lock, flags);
1069                 return ret;
1070         }
1071
1072         backlog = crypto_get_backlog(&dd->queue);
1073         async_req = crypto_dequeue_request(&dd->queue);
1074         if (async_req)
1075                 dd->flags |= SHA_FLAGS_BUSY;
1076
1077         spin_unlock_irqrestore(&dd->lock, flags);
1078
1079         if (!async_req)
1080                 return ret;
1081
1082         if (backlog)
1083                 backlog->complete(backlog, -EINPROGRESS);
1084
1085         ctx = crypto_tfm_ctx(async_req->tfm);
1086
1087         dd->req = ahash_request_cast(async_req);
1088         start_async = (dd->req != req);
1089         dd->is_async = start_async;
1090         dd->force_complete = false;
1091
1092         /* WARNING: ctx->start() MAY change dd->is_async. */
1093         err = ctx->start(dd);
1094         return (start_async) ? ret : err;
1095 }
1096
1097 static int atmel_sha_done(struct atmel_sha_dev *dd);
1098
1099 static int atmel_sha_start(struct atmel_sha_dev *dd)
1100 {
1101         struct ahash_request *req = dd->req;
1102         struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1103         int err;
1104
1105         dev_dbg(dd->dev, "handling new req, op: %lu, nbytes: %d\n",
1106                                                 ctx->op, req->nbytes);
1107
1108         err = atmel_sha_hw_init(dd);
1109         if (err)
1110                 return atmel_sha_complete(dd, err);
1111
1112         /*
1113          * atmel_sha_update_req() and atmel_sha_final_req() can return either:
1114          *  -EINPROGRESS: the hardware is busy and the SHA driver will resume
1115          *                its job later in the done_task.
1116          *                This is the main path.
1117          *
1118          * 0: the SHA driver can continue its job then release the hardware
1119          *    later, if needed, with atmel_sha_finish_req().
1120          *    This is the alternate path.
1121          *
1122          * < 0: an error has occurred so atmel_sha_complete(dd, err) has already
1123          *      been called, hence the hardware has been released.
1124          *      The SHA driver must stop its job without calling
1125          *      atmel_sha_finish_req(), otherwise atmel_sha_complete() would be
1126          *      called a second time.
1127          *
1128          * Please note that currently, atmel_sha_final_req() never returns 0.
1129          */
1130
1131         dd->resume = atmel_sha_done;
1132         if (ctx->op == SHA_OP_UPDATE) {
1133                 err = atmel_sha_update_req(dd);
1134                 if (!err && (ctx->flags & SHA_FLAGS_FINUP))
1135                         /* no final() after finup() */
1136                         err = atmel_sha_final_req(dd);
1137         } else if (ctx->op == SHA_OP_FINAL) {
1138                 err = atmel_sha_final_req(dd);
1139         }
1140
1141         if (!err)
1142                 /* done_task will not finish it, so do it here */
1143                 atmel_sha_finish_req(req, err);
1144
1145         dev_dbg(dd->dev, "exit, err: %d\n", err);
1146
1147         return err;
1148 }
1149
1150 static int atmel_sha_enqueue(struct ahash_request *req, unsigned int op)
1151 {
1152         struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1153         struct atmel_sha_ctx *tctx = crypto_tfm_ctx(req->base.tfm);
1154         struct atmel_sha_dev *dd = tctx->dd;
1155
1156         ctx->op = op;
1157
1158         return atmel_sha_handle_queue(dd, req);
1159 }
1160
1161 static int atmel_sha_update(struct ahash_request *req)
1162 {
1163         struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1164
1165         if (!req->nbytes)
1166                 return 0;
1167
1168         ctx->total = req->nbytes;
1169         ctx->sg = req->src;
1170         ctx->offset = 0;
1171
1172         if (ctx->flags & SHA_FLAGS_FINUP) {
1173                 if (ctx->bufcnt + ctx->total < ATMEL_SHA_DMA_THRESHOLD)
1174                         /* faster to use CPU for short transfers */
1175                         ctx->flags |= SHA_FLAGS_CPU;
1176         } else if (ctx->bufcnt + ctx->total < ctx->buflen) {
1177                 atmel_sha_append_sg(ctx);
1178                 return 0;
1179         }
1180         return atmel_sha_enqueue(req, SHA_OP_UPDATE);
1181 }
1182
1183 static int atmel_sha_final(struct ahash_request *req)
1184 {
1185         struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1186
1187         ctx->flags |= SHA_FLAGS_FINUP;
1188
1189         if (ctx->flags & SHA_FLAGS_ERROR)
1190                 return 0; /* uncompleted hash is not needed */
1191
1192         if (ctx->flags & SHA_FLAGS_PAD)
1193                 /* copy ready hash (+ finalize hmac) */
1194                 return atmel_sha_finish(req);
1195
1196         return atmel_sha_enqueue(req, SHA_OP_FINAL);
1197 }
1198
1199 static int atmel_sha_finup(struct ahash_request *req)
1200 {
1201         struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1202         int err1, err2;
1203
1204         ctx->flags |= SHA_FLAGS_FINUP;
1205
1206         err1 = atmel_sha_update(req);
1207         if (err1 == -EINPROGRESS ||
1208             (err1 == -EBUSY && (ahash_request_flags(req) &
1209                                 CRYPTO_TFM_REQ_MAY_BACKLOG)))
1210                 return err1;
1211
1212         /*
1213          * final() has to be always called to cleanup resources
1214          * even if udpate() failed, except EINPROGRESS
1215          */
1216         err2 = atmel_sha_final(req);
1217
1218         return err1 ?: err2;
1219 }
1220
1221 static int atmel_sha_digest(struct ahash_request *req)
1222 {
1223         return atmel_sha_init(req) ?: atmel_sha_finup(req);
1224 }
1225
1226
1227 static int atmel_sha_export(struct ahash_request *req, void *out)
1228 {
1229         const struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1230
1231         memcpy(out, ctx, sizeof(*ctx));
1232         return 0;
1233 }
1234
1235 static int atmel_sha_import(struct ahash_request *req, const void *in)
1236 {
1237         struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1238
1239         memcpy(ctx, in, sizeof(*ctx));
1240         return 0;
1241 }
1242
1243 static int atmel_sha_cra_init(struct crypto_tfm *tfm)
1244 {
1245         struct atmel_sha_ctx *ctx = crypto_tfm_ctx(tfm);
1246
1247         crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
1248                                  sizeof(struct atmel_sha_reqctx));
1249         ctx->start = atmel_sha_start;
1250
1251         return 0;
1252 }
1253
1254 static struct ahash_alg sha_1_256_algs[] = {
1255 {
1256         .init           = atmel_sha_init,
1257         .update         = atmel_sha_update,
1258         .final          = atmel_sha_final,
1259         .finup          = atmel_sha_finup,
1260         .digest         = atmel_sha_digest,
1261         .export         = atmel_sha_export,
1262         .import         = atmel_sha_import,
1263         .halg = {
1264                 .digestsize     = SHA1_DIGEST_SIZE,
1265                 .statesize      = sizeof(struct atmel_sha_reqctx),
1266                 .base   = {
1267                         .cra_name               = "sha1",
1268                         .cra_driver_name        = "atmel-sha1",
1269                         .cra_priority           = 100,
1270                         .cra_flags              = CRYPTO_ALG_ASYNC,
1271                         .cra_blocksize          = SHA1_BLOCK_SIZE,
1272                         .cra_ctxsize            = sizeof(struct atmel_sha_ctx),
1273                         .cra_alignmask          = 0,
1274                         .cra_module             = THIS_MODULE,
1275                         .cra_init               = atmel_sha_cra_init,
1276                 }
1277         }
1278 },
1279 {
1280         .init           = atmel_sha_init,
1281         .update         = atmel_sha_update,
1282         .final          = atmel_sha_final,
1283         .finup          = atmel_sha_finup,
1284         .digest         = atmel_sha_digest,
1285         .export         = atmel_sha_export,
1286         .import         = atmel_sha_import,
1287         .halg = {
1288                 .digestsize     = SHA256_DIGEST_SIZE,
1289                 .statesize      = sizeof(struct atmel_sha_reqctx),
1290                 .base   = {
1291                         .cra_name               = "sha256",
1292                         .cra_driver_name        = "atmel-sha256",
1293                         .cra_priority           = 100,
1294                         .cra_flags              = CRYPTO_ALG_ASYNC,
1295                         .cra_blocksize          = SHA256_BLOCK_SIZE,
1296                         .cra_ctxsize            = sizeof(struct atmel_sha_ctx),
1297                         .cra_alignmask          = 0,
1298                         .cra_module             = THIS_MODULE,
1299                         .cra_init               = atmel_sha_cra_init,
1300                 }
1301         }
1302 },
1303 };
1304
1305 static struct ahash_alg sha_224_alg = {
1306         .init           = atmel_sha_init,
1307         .update         = atmel_sha_update,
1308         .final          = atmel_sha_final,
1309         .finup          = atmel_sha_finup,
1310         .digest         = atmel_sha_digest,
1311         .export         = atmel_sha_export,
1312         .import         = atmel_sha_import,
1313         .halg = {
1314                 .digestsize     = SHA224_DIGEST_SIZE,
1315                 .statesize      = sizeof(struct atmel_sha_reqctx),
1316                 .base   = {
1317                         .cra_name               = "sha224",
1318                         .cra_driver_name        = "atmel-sha224",
1319                         .cra_priority           = 100,
1320                         .cra_flags              = CRYPTO_ALG_ASYNC,
1321                         .cra_blocksize          = SHA224_BLOCK_SIZE,
1322                         .cra_ctxsize            = sizeof(struct atmel_sha_ctx),
1323                         .cra_alignmask          = 0,
1324                         .cra_module             = THIS_MODULE,
1325                         .cra_init               = atmel_sha_cra_init,
1326                 }
1327         }
1328 };
1329
1330 static struct ahash_alg sha_384_512_algs[] = {
1331 {
1332         .init           = atmel_sha_init,
1333         .update         = atmel_sha_update,
1334         .final          = atmel_sha_final,
1335         .finup          = atmel_sha_finup,
1336         .digest         = atmel_sha_digest,
1337         .export         = atmel_sha_export,
1338         .import         = atmel_sha_import,
1339         .halg = {
1340                 .digestsize     = SHA384_DIGEST_SIZE,
1341                 .statesize      = sizeof(struct atmel_sha_reqctx),
1342                 .base   = {
1343                         .cra_name               = "sha384",
1344                         .cra_driver_name        = "atmel-sha384",
1345                         .cra_priority           = 100,
1346                         .cra_flags              = CRYPTO_ALG_ASYNC,
1347                         .cra_blocksize          = SHA384_BLOCK_SIZE,
1348                         .cra_ctxsize            = sizeof(struct atmel_sha_ctx),
1349                         .cra_alignmask          = 0x3,
1350                         .cra_module             = THIS_MODULE,
1351                         .cra_init               = atmel_sha_cra_init,
1352                 }
1353         }
1354 },
1355 {
1356         .init           = atmel_sha_init,
1357         .update         = atmel_sha_update,
1358         .final          = atmel_sha_final,
1359         .finup          = atmel_sha_finup,
1360         .digest         = atmel_sha_digest,
1361         .export         = atmel_sha_export,
1362         .import         = atmel_sha_import,
1363         .halg = {
1364                 .digestsize     = SHA512_DIGEST_SIZE,
1365                 .statesize      = sizeof(struct atmel_sha_reqctx),
1366                 .base   = {
1367                         .cra_name               = "sha512",
1368                         .cra_driver_name        = "atmel-sha512",
1369                         .cra_priority           = 100,
1370                         .cra_flags              = CRYPTO_ALG_ASYNC,
1371                         .cra_blocksize          = SHA512_BLOCK_SIZE,
1372                         .cra_ctxsize            = sizeof(struct atmel_sha_ctx),
1373                         .cra_alignmask          = 0x3,
1374                         .cra_module             = THIS_MODULE,
1375                         .cra_init               = atmel_sha_cra_init,
1376                 }
1377         }
1378 },
1379 };
1380
1381 static void atmel_sha_queue_task(unsigned long data)
1382 {
1383         struct atmel_sha_dev *dd = (struct atmel_sha_dev *)data;
1384
1385         atmel_sha_handle_queue(dd, NULL);
1386 }
1387
1388 static int atmel_sha_done(struct atmel_sha_dev *dd)
1389 {
1390         int err = 0;
1391
1392         if (SHA_FLAGS_CPU & dd->flags) {
1393                 if (SHA_FLAGS_OUTPUT_READY & dd->flags) {
1394                         dd->flags &= ~SHA_FLAGS_OUTPUT_READY;
1395                         goto finish;
1396                 }
1397         } else if (SHA_FLAGS_DMA_READY & dd->flags) {
1398                 if (SHA_FLAGS_DMA_ACTIVE & dd->flags) {
1399                         dd->flags &= ~SHA_FLAGS_DMA_ACTIVE;
1400                         atmel_sha_update_dma_stop(dd);
1401                         if (dd->err) {
1402                                 err = dd->err;
1403                                 goto finish;
1404                         }
1405                 }
1406                 if (SHA_FLAGS_OUTPUT_READY & dd->flags) {
1407                         /* hash or semi-hash ready */
1408                         dd->flags &= ~(SHA_FLAGS_DMA_READY |
1409                                                 SHA_FLAGS_OUTPUT_READY);
1410                         err = atmel_sha_update_dma_start(dd);
1411                         if (err != -EINPROGRESS)
1412                                 goto finish;
1413                 }
1414         }
1415         return err;
1416
1417 finish:
1418         /* finish curent request */
1419         atmel_sha_finish_req(dd->req, err);
1420
1421         return err;
1422 }
1423
1424 static void atmel_sha_done_task(unsigned long data)
1425 {
1426         struct atmel_sha_dev *dd = (struct atmel_sha_dev *)data;
1427
1428         dd->is_async = true;
1429         (void)dd->resume(dd);
1430 }
1431
1432 static irqreturn_t atmel_sha_irq(int irq, void *dev_id)
1433 {
1434         struct atmel_sha_dev *sha_dd = dev_id;
1435         u32 reg;
1436
1437         reg = atmel_sha_read(sha_dd, SHA_ISR);
1438         if (reg & atmel_sha_read(sha_dd, SHA_IMR)) {
1439                 atmel_sha_write(sha_dd, SHA_IDR, reg);
1440                 if (SHA_FLAGS_BUSY & sha_dd->flags) {
1441                         sha_dd->flags |= SHA_FLAGS_OUTPUT_READY;
1442                         if (!(SHA_FLAGS_CPU & sha_dd->flags))
1443                                 sha_dd->flags |= SHA_FLAGS_DMA_READY;
1444                         tasklet_schedule(&sha_dd->done_task);
1445                 } else {
1446                         dev_warn(sha_dd->dev, "SHA interrupt when no active requests.\n");
1447                 }
1448                 return IRQ_HANDLED;
1449         }
1450
1451         return IRQ_NONE;
1452 }
1453
1454
1455 /* DMA transfer functions */
1456
1457 static bool atmel_sha_dma_check_aligned(struct atmel_sha_dev *dd,
1458                                         struct scatterlist *sg,
1459                                         size_t len)
1460 {
1461         struct atmel_sha_dma *dma = &dd->dma_lch_in;
1462         struct ahash_request *req = dd->req;
1463         struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1464         size_t bs = ctx->block_size;
1465         int nents;
1466
1467         for (nents = 0; sg; sg = sg_next(sg), ++nents) {
1468                 if (!IS_ALIGNED(sg->offset, sizeof(u32)))
1469                         return false;
1470
1471                 /*
1472                  * This is the last sg, the only one that is allowed to
1473                  * have an unaligned length.
1474                  */
1475                 if (len <= sg->length) {
1476                         dma->nents = nents + 1;
1477                         dma->last_sg_length = sg->length;
1478                         sg->length = ALIGN(len, sizeof(u32));
1479                         return true;
1480                 }
1481
1482                 /* All other sg lengths MUST be aligned to the block size. */
1483                 if (!IS_ALIGNED(sg->length, bs))
1484                         return false;
1485
1486                 len -= sg->length;
1487         }
1488
1489         return false;
1490 }
1491
1492 static void atmel_sha_dma_callback2(void *data)
1493 {
1494         struct atmel_sha_dev *dd = data;
1495         struct atmel_sha_dma *dma = &dd->dma_lch_in;
1496         struct scatterlist *sg;
1497         int nents;
1498
1499         dmaengine_terminate_all(dma->chan);
1500         dma_unmap_sg(dd->dev, dma->sg, dma->nents, DMA_TO_DEVICE);
1501
1502         sg = dma->sg;
1503         for (nents = 0; nents < dma->nents - 1; ++nents)
1504                 sg = sg_next(sg);
1505         sg->length = dma->last_sg_length;
1506
1507         dd->is_async = true;
1508         (void)atmel_sha_wait_for_data_ready(dd, dd->resume);
1509 }
1510
1511 static int atmel_sha_dma_start(struct atmel_sha_dev *dd,
1512                                struct scatterlist *src,
1513                                size_t len,
1514                                atmel_sha_fn_t resume)
1515 {
1516         struct atmel_sha_dma *dma = &dd->dma_lch_in;
1517         struct dma_slave_config *config = &dma->dma_conf;
1518         struct dma_chan *chan = dma->chan;
1519         struct dma_async_tx_descriptor *desc;
1520         dma_cookie_t cookie;
1521         unsigned int sg_len;
1522         int err;
1523
1524         dd->resume = resume;
1525
1526         /*
1527          * dma->nents has already been initialized by
1528          * atmel_sha_dma_check_aligned().
1529          */
1530         dma->sg = src;
1531         sg_len = dma_map_sg(dd->dev, dma->sg, dma->nents, DMA_TO_DEVICE);
1532         if (!sg_len) {
1533                 err = -ENOMEM;
1534                 goto exit;
1535         }
1536
1537         config->src_maxburst = 16;
1538         config->dst_maxburst = 16;
1539         err = dmaengine_slave_config(chan, config);
1540         if (err)
1541                 goto unmap_sg;
1542
1543         desc = dmaengine_prep_slave_sg(chan, dma->sg, sg_len, DMA_MEM_TO_DEV,
1544                                        DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1545         if (!desc) {
1546                 err = -ENOMEM;
1547                 goto unmap_sg;
1548         }
1549
1550         desc->callback = atmel_sha_dma_callback2;
1551         desc->callback_param = dd;
1552         cookie = dmaengine_submit(desc);
1553         err = dma_submit_error(cookie);
1554         if (err)
1555                 goto unmap_sg;
1556
1557         dma_async_issue_pending(chan);
1558
1559         return -EINPROGRESS;
1560
1561 unmap_sg:
1562         dma_unmap_sg(dd->dev, dma->sg, dma->nents, DMA_TO_DEVICE);
1563 exit:
1564         return atmel_sha_complete(dd, err);
1565 }
1566
1567
1568 /* CPU transfer functions */
1569
1570 static int atmel_sha_cpu_transfer(struct atmel_sha_dev *dd)
1571 {
1572         struct ahash_request *req = dd->req;
1573         struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1574         const u32 *words = (const u32 *)ctx->buffer;
1575         size_t i, num_words;
1576         u32 isr, din, din_inc;
1577
1578         din_inc = (ctx->flags & SHA_FLAGS_IDATAR0) ? 0 : 1;
1579         for (;;) {
1580                 /* Write data into the Input Data Registers. */
1581                 num_words = DIV_ROUND_UP(ctx->bufcnt, sizeof(u32));
1582                 for (i = 0, din = 0; i < num_words; ++i, din += din_inc)
1583                         atmel_sha_write(dd, SHA_REG_DIN(din), words[i]);
1584
1585                 ctx->offset += ctx->bufcnt;
1586                 ctx->total -= ctx->bufcnt;
1587
1588                 if (!ctx->total)
1589                         break;
1590
1591                 /*
1592                  * Prepare next block:
1593                  * Fill ctx->buffer now with the next data to be written into
1594                  * IDATARx: it gives time for the SHA hardware to process
1595                  * the current data so the SHA_INT_DATARDY flag might be set
1596                  * in SHA_ISR when polling this register at the beginning of
1597                  * the next loop.
1598                  */
1599                 ctx->bufcnt = min_t(size_t, ctx->block_size, ctx->total);
1600                 scatterwalk_map_and_copy(ctx->buffer, ctx->sg,
1601                                          ctx->offset, ctx->bufcnt, 0);
1602
1603                 /* Wait for hardware to be ready again. */
1604                 isr = atmel_sha_read(dd, SHA_ISR);
1605                 if (!(isr & SHA_INT_DATARDY)) {
1606                         /* Not ready yet. */
1607                         dd->resume = atmel_sha_cpu_transfer;
1608                         atmel_sha_write(dd, SHA_IER, SHA_INT_DATARDY);
1609                         return -EINPROGRESS;
1610                 }
1611         }
1612
1613         if (unlikely(!(ctx->flags & SHA_FLAGS_WAIT_DATARDY)))
1614                 return dd->cpu_transfer_complete(dd);
1615
1616         return atmel_sha_wait_for_data_ready(dd, dd->cpu_transfer_complete);
1617 }
1618
1619 static int atmel_sha_cpu_start(struct atmel_sha_dev *dd,
1620                                struct scatterlist *sg,
1621                                unsigned int len,
1622                                bool idatar0_only,
1623                                bool wait_data_ready,
1624                                atmel_sha_fn_t resume)
1625 {
1626         struct ahash_request *req = dd->req;
1627         struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1628
1629         if (!len)
1630                 return resume(dd);
1631
1632         ctx->flags &= ~(SHA_FLAGS_IDATAR0 | SHA_FLAGS_WAIT_DATARDY);
1633
1634         if (idatar0_only)
1635                 ctx->flags |= SHA_FLAGS_IDATAR0;
1636
1637         if (wait_data_ready)
1638                 ctx->flags |= SHA_FLAGS_WAIT_DATARDY;
1639
1640         ctx->sg = sg;
1641         ctx->total = len;
1642         ctx->offset = 0;
1643
1644         /* Prepare the first block to be written. */
1645         ctx->bufcnt = min_t(size_t, ctx->block_size, ctx->total);
1646         scatterwalk_map_and_copy(ctx->buffer, ctx->sg,
1647                                  ctx->offset, ctx->bufcnt, 0);
1648
1649         dd->cpu_transfer_complete = resume;
1650         return atmel_sha_cpu_transfer(dd);
1651 }
1652
1653 static int atmel_sha_cpu_hash(struct atmel_sha_dev *dd,
1654                               const void *data, unsigned int datalen,
1655                               bool auto_padding,
1656                               atmel_sha_fn_t resume)
1657 {
1658         struct ahash_request *req = dd->req;
1659         struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1660         u32 msglen = (auto_padding) ? datalen : 0;
1661         u32 mr = SHA_MR_MODE_AUTO;
1662
1663         if (!(IS_ALIGNED(datalen, ctx->block_size) || auto_padding))
1664                 return atmel_sha_complete(dd, -EINVAL);
1665
1666         mr |= (ctx->flags & SHA_FLAGS_ALGO_MASK);
1667         atmel_sha_write(dd, SHA_MR, mr);
1668         atmel_sha_write(dd, SHA_MSR, msglen);
1669         atmel_sha_write(dd, SHA_BCR, msglen);
1670         atmel_sha_write(dd, SHA_CR, SHA_CR_FIRST);
1671
1672         sg_init_one(&dd->tmp, data, datalen);
1673         return atmel_sha_cpu_start(dd, &dd->tmp, datalen, false, true, resume);
1674 }
1675
1676
1677 /* hmac functions */
1678
1679 struct atmel_sha_hmac_key {
1680         bool                    valid;
1681         unsigned int            keylen;
1682         u8                      buffer[SHA512_BLOCK_SIZE];
1683         u8                      *keydup;
1684 };
1685
1686 static inline void atmel_sha_hmac_key_init(struct atmel_sha_hmac_key *hkey)
1687 {
1688         memset(hkey, 0, sizeof(*hkey));
1689 }
1690
1691 static inline void atmel_sha_hmac_key_release(struct atmel_sha_hmac_key *hkey)
1692 {
1693         kfree(hkey->keydup);
1694         memset(hkey, 0, sizeof(*hkey));
1695 }
1696
1697 static inline int atmel_sha_hmac_key_set(struct atmel_sha_hmac_key *hkey,
1698                                          const u8 *key,
1699                                          unsigned int keylen)
1700 {
1701         atmel_sha_hmac_key_release(hkey);
1702
1703         if (keylen > sizeof(hkey->buffer)) {
1704                 hkey->keydup = kmemdup(key, keylen, GFP_KERNEL);
1705                 if (!hkey->keydup)
1706                         return -ENOMEM;
1707
1708         } else {
1709                 memcpy(hkey->buffer, key, keylen);
1710         }
1711
1712         hkey->valid = true;
1713         hkey->keylen = keylen;
1714         return 0;
1715 }
1716
1717 static inline bool atmel_sha_hmac_key_get(const struct atmel_sha_hmac_key *hkey,
1718                                           const u8 **key,
1719                                           unsigned int *keylen)
1720 {
1721         if (!hkey->valid)
1722                 return false;
1723
1724         *keylen = hkey->keylen;
1725         *key = (hkey->keydup) ? hkey->keydup : hkey->buffer;
1726         return true;
1727 }
1728
1729
1730 struct atmel_sha_hmac_ctx {
1731         struct atmel_sha_ctx    base;
1732
1733         struct atmel_sha_hmac_key       hkey;
1734         u32                     ipad[SHA512_BLOCK_SIZE / sizeof(u32)];
1735         u32                     opad[SHA512_BLOCK_SIZE / sizeof(u32)];
1736         atmel_sha_fn_t          resume;
1737 };
1738
1739 static int atmel_sha_hmac_setup(struct atmel_sha_dev *dd,
1740                                 atmel_sha_fn_t resume);
1741 static int atmel_sha_hmac_prehash_key(struct atmel_sha_dev *dd,
1742                                       const u8 *key, unsigned int keylen);
1743 static int atmel_sha_hmac_prehash_key_done(struct atmel_sha_dev *dd);
1744 static int atmel_sha_hmac_compute_ipad_hash(struct atmel_sha_dev *dd);
1745 static int atmel_sha_hmac_compute_opad_hash(struct atmel_sha_dev *dd);
1746 static int atmel_sha_hmac_setup_done(struct atmel_sha_dev *dd);
1747
1748 static int atmel_sha_hmac_init_done(struct atmel_sha_dev *dd);
1749 static int atmel_sha_hmac_final(struct atmel_sha_dev *dd);
1750 static int atmel_sha_hmac_final_done(struct atmel_sha_dev *dd);
1751 static int atmel_sha_hmac_digest2(struct atmel_sha_dev *dd);
1752
1753 static int atmel_sha_hmac_setup(struct atmel_sha_dev *dd,
1754                                 atmel_sha_fn_t resume)
1755 {
1756         struct ahash_request *req = dd->req;
1757         struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1758         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
1759         struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
1760         unsigned int keylen;
1761         const u8 *key;
1762         size_t bs;
1763
1764         hmac->resume = resume;
1765         switch (ctx->flags & SHA_FLAGS_ALGO_MASK) {
1766         case SHA_FLAGS_SHA1:
1767                 ctx->block_size = SHA1_BLOCK_SIZE;
1768                 ctx->hash_size = SHA1_DIGEST_SIZE;
1769                 break;
1770
1771         case SHA_FLAGS_SHA224:
1772                 ctx->block_size = SHA224_BLOCK_SIZE;
1773                 ctx->hash_size = SHA256_DIGEST_SIZE;
1774                 break;
1775
1776         case SHA_FLAGS_SHA256:
1777                 ctx->block_size = SHA256_BLOCK_SIZE;
1778                 ctx->hash_size = SHA256_DIGEST_SIZE;
1779                 break;
1780
1781         case SHA_FLAGS_SHA384:
1782                 ctx->block_size = SHA384_BLOCK_SIZE;
1783                 ctx->hash_size = SHA512_DIGEST_SIZE;
1784                 break;
1785
1786         case SHA_FLAGS_SHA512:
1787                 ctx->block_size = SHA512_BLOCK_SIZE;
1788                 ctx->hash_size = SHA512_DIGEST_SIZE;
1789                 break;
1790
1791         default:
1792                 return atmel_sha_complete(dd, -EINVAL);
1793         }
1794         bs = ctx->block_size;
1795
1796         if (likely(!atmel_sha_hmac_key_get(&hmac->hkey, &key, &keylen)))
1797                 return resume(dd);
1798
1799         /* Compute K' from K. */
1800         if (unlikely(keylen > bs))
1801                 return atmel_sha_hmac_prehash_key(dd, key, keylen);
1802
1803         /* Prepare ipad. */
1804         memcpy((u8 *)hmac->ipad, key, keylen);
1805         memset((u8 *)hmac->ipad + keylen, 0, bs - keylen);
1806         return atmel_sha_hmac_compute_ipad_hash(dd);
1807 }
1808
1809 static int atmel_sha_hmac_prehash_key(struct atmel_sha_dev *dd,
1810                                       const u8 *key, unsigned int keylen)
1811 {
1812         return atmel_sha_cpu_hash(dd, key, keylen, true,
1813                                   atmel_sha_hmac_prehash_key_done);
1814 }
1815
1816 static int atmel_sha_hmac_prehash_key_done(struct atmel_sha_dev *dd)
1817 {
1818         struct ahash_request *req = dd->req;
1819         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
1820         struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
1821         struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1822         size_t ds = crypto_ahash_digestsize(tfm);
1823         size_t bs = ctx->block_size;
1824         size_t i, num_words = ds / sizeof(u32);
1825
1826         /* Prepare ipad. */
1827         for (i = 0; i < num_words; ++i)
1828                 hmac->ipad[i] = atmel_sha_read(dd, SHA_REG_DIGEST(i));
1829         memset((u8 *)hmac->ipad + ds, 0, bs - ds);
1830         return atmel_sha_hmac_compute_ipad_hash(dd);
1831 }
1832
1833 static int atmel_sha_hmac_compute_ipad_hash(struct atmel_sha_dev *dd)
1834 {
1835         struct ahash_request *req = dd->req;
1836         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
1837         struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
1838         struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1839         size_t bs = ctx->block_size;
1840         size_t i, num_words = bs / sizeof(u32);
1841
1842         memcpy(hmac->opad, hmac->ipad, bs);
1843         for (i = 0; i < num_words; ++i) {
1844                 hmac->ipad[i] ^= 0x36363636;
1845                 hmac->opad[i] ^= 0x5c5c5c5c;
1846         }
1847
1848         return atmel_sha_cpu_hash(dd, hmac->ipad, bs, false,
1849                                   atmel_sha_hmac_compute_opad_hash);
1850 }
1851
1852 static int atmel_sha_hmac_compute_opad_hash(struct atmel_sha_dev *dd)
1853 {
1854         struct ahash_request *req = dd->req;
1855         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
1856         struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
1857         struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1858         size_t bs = ctx->block_size;
1859         size_t hs = ctx->hash_size;
1860         size_t i, num_words = hs / sizeof(u32);
1861
1862         for (i = 0; i < num_words; ++i)
1863                 hmac->ipad[i] = atmel_sha_read(dd, SHA_REG_DIGEST(i));
1864         return atmel_sha_cpu_hash(dd, hmac->opad, bs, false,
1865                                   atmel_sha_hmac_setup_done);
1866 }
1867
1868 static int atmel_sha_hmac_setup_done(struct atmel_sha_dev *dd)
1869 {
1870         struct ahash_request *req = dd->req;
1871         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
1872         struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
1873         struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1874         size_t hs = ctx->hash_size;
1875         size_t i, num_words = hs / sizeof(u32);
1876
1877         for (i = 0; i < num_words; ++i)
1878                 hmac->opad[i] = atmel_sha_read(dd, SHA_REG_DIGEST(i));
1879         atmel_sha_hmac_key_release(&hmac->hkey);
1880         return hmac->resume(dd);
1881 }
1882
1883 static int atmel_sha_hmac_start(struct atmel_sha_dev *dd)
1884 {
1885         struct ahash_request *req = dd->req;
1886         struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1887         int err;
1888
1889         err = atmel_sha_hw_init(dd);
1890         if (err)
1891                 return atmel_sha_complete(dd, err);
1892
1893         switch (ctx->op) {
1894         case SHA_OP_INIT:
1895                 err = atmel_sha_hmac_setup(dd, atmel_sha_hmac_init_done);
1896                 break;
1897
1898         case SHA_OP_UPDATE:
1899                 dd->resume = atmel_sha_done;
1900                 err = atmel_sha_update_req(dd);
1901                 break;
1902
1903         case SHA_OP_FINAL:
1904                 dd->resume = atmel_sha_hmac_final;
1905                 err = atmel_sha_final_req(dd);
1906                 break;
1907
1908         case SHA_OP_DIGEST:
1909                 err = atmel_sha_hmac_setup(dd, atmel_sha_hmac_digest2);
1910                 break;
1911
1912         default:
1913                 return atmel_sha_complete(dd, -EINVAL);
1914         }
1915
1916         return err;
1917 }
1918
1919 static int atmel_sha_hmac_setkey(struct crypto_ahash *tfm, const u8 *key,
1920                                  unsigned int keylen)
1921 {
1922         struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
1923
1924         return atmel_sha_hmac_key_set(&hmac->hkey, key, keylen);
1925 }
1926
1927 static int atmel_sha_hmac_init(struct ahash_request *req)
1928 {
1929         int err;
1930
1931         err = atmel_sha_init(req);
1932         if (err)
1933                 return err;
1934
1935         return atmel_sha_enqueue(req, SHA_OP_INIT);
1936 }
1937
1938 static int atmel_sha_hmac_init_done(struct atmel_sha_dev *dd)
1939 {
1940         struct ahash_request *req = dd->req;
1941         struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1942         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
1943         struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
1944         size_t bs = ctx->block_size;
1945         size_t hs = ctx->hash_size;
1946
1947         ctx->bufcnt = 0;
1948         ctx->digcnt[0] = bs;
1949         ctx->digcnt[1] = 0;
1950         ctx->flags |= SHA_FLAGS_RESTORE;
1951         memcpy(ctx->digest, hmac->ipad, hs);
1952         return atmel_sha_complete(dd, 0);
1953 }
1954
1955 static int atmel_sha_hmac_final(struct atmel_sha_dev *dd)
1956 {
1957         struct ahash_request *req = dd->req;
1958         struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1959         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
1960         struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
1961         u32 *digest = (u32 *)ctx->digest;
1962         size_t ds = crypto_ahash_digestsize(tfm);
1963         size_t bs = ctx->block_size;
1964         size_t hs = ctx->hash_size;
1965         size_t i, num_words;
1966         u32 mr;
1967
1968         /* Save d = SHA((K' + ipad) | msg). */
1969         num_words = ds / sizeof(u32);
1970         for (i = 0; i < num_words; ++i)
1971                 digest[i] = atmel_sha_read(dd, SHA_REG_DIGEST(i));
1972
1973         /* Restore context to finish computing SHA((K' + opad) | d). */
1974         atmel_sha_write(dd, SHA_CR, SHA_CR_WUIHV);
1975         num_words = hs / sizeof(u32);
1976         for (i = 0; i < num_words; ++i)
1977                 atmel_sha_write(dd, SHA_REG_DIN(i), hmac->opad[i]);
1978
1979         mr = SHA_MR_MODE_AUTO | SHA_MR_UIHV;
1980         mr |= (ctx->flags & SHA_FLAGS_ALGO_MASK);
1981         atmel_sha_write(dd, SHA_MR, mr);
1982         atmel_sha_write(dd, SHA_MSR, bs + ds);
1983         atmel_sha_write(dd, SHA_BCR, ds);
1984         atmel_sha_write(dd, SHA_CR, SHA_CR_FIRST);
1985
1986         sg_init_one(&dd->tmp, digest, ds);
1987         return atmel_sha_cpu_start(dd, &dd->tmp, ds, false, true,
1988                                    atmel_sha_hmac_final_done);
1989 }
1990
1991 static int atmel_sha_hmac_final_done(struct atmel_sha_dev *dd)
1992 {
1993         /*
1994          * req->result might not be sizeof(u32) aligned, so copy the
1995          * digest into ctx->digest[] before memcpy() the data into
1996          * req->result.
1997          */
1998         atmel_sha_copy_hash(dd->req);
1999         atmel_sha_copy_ready_hash(dd->req);
2000         return atmel_sha_complete(dd, 0);
2001 }
2002
2003 static int atmel_sha_hmac_digest(struct ahash_request *req)
2004 {
2005         int err;
2006
2007         err = atmel_sha_init(req);
2008         if (err)
2009                 return err;
2010
2011         return atmel_sha_enqueue(req, SHA_OP_DIGEST);
2012 }
2013
2014 static int atmel_sha_hmac_digest2(struct atmel_sha_dev *dd)
2015 {
2016         struct ahash_request *req = dd->req;
2017         struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
2018         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
2019         struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
2020         size_t hs = ctx->hash_size;
2021         size_t i, num_words = hs / sizeof(u32);
2022         bool use_dma = false;
2023         u32 mr;
2024
2025         /* Special case for empty message. */
2026         if (!req->nbytes)
2027                 return atmel_sha_complete(dd, -EINVAL); // TODO:
2028
2029         /* Check DMA threshold and alignment. */
2030         if (req->nbytes > ATMEL_SHA_DMA_THRESHOLD &&
2031             atmel_sha_dma_check_aligned(dd, req->src, req->nbytes))
2032                 use_dma = true;
2033
2034         /* Write both initial hash values to compute a HMAC. */
2035         atmel_sha_write(dd, SHA_CR, SHA_CR_WUIHV);
2036         for (i = 0; i < num_words; ++i)
2037                 atmel_sha_write(dd, SHA_REG_DIN(i), hmac->ipad[i]);
2038
2039         atmel_sha_write(dd, SHA_CR, SHA_CR_WUIEHV);
2040         for (i = 0; i < num_words; ++i)
2041                 atmel_sha_write(dd, SHA_REG_DIN(i), hmac->opad[i]);
2042
2043         /* Write the Mode, Message Size, Bytes Count then Control Registers. */
2044         mr = (SHA_MR_HMAC | SHA_MR_DUALBUFF);
2045         mr |= ctx->flags & SHA_FLAGS_ALGO_MASK;
2046         if (use_dma)
2047                 mr |= SHA_MR_MODE_IDATAR0;
2048         else
2049                 mr |= SHA_MR_MODE_AUTO;
2050         atmel_sha_write(dd, SHA_MR, mr);
2051
2052         atmel_sha_write(dd, SHA_MSR, req->nbytes);
2053         atmel_sha_write(dd, SHA_BCR, req->nbytes);
2054
2055         atmel_sha_write(dd, SHA_CR, SHA_CR_FIRST);
2056
2057         /* Process data. */
2058         if (use_dma)
2059                 return atmel_sha_dma_start(dd, req->src, req->nbytes,
2060                                            atmel_sha_hmac_final_done);
2061
2062         return atmel_sha_cpu_start(dd, req->src, req->nbytes, false, true,
2063                                    atmel_sha_hmac_final_done);
2064 }
2065
2066 static int atmel_sha_hmac_cra_init(struct crypto_tfm *tfm)
2067 {
2068         struct atmel_sha_hmac_ctx *hmac = crypto_tfm_ctx(tfm);
2069
2070         crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
2071                                  sizeof(struct atmel_sha_reqctx));
2072         hmac->base.start = atmel_sha_hmac_start;
2073         atmel_sha_hmac_key_init(&hmac->hkey);
2074
2075         return 0;
2076 }
2077
2078 static void atmel_sha_hmac_cra_exit(struct crypto_tfm *tfm)
2079 {
2080         struct atmel_sha_hmac_ctx *hmac = crypto_tfm_ctx(tfm);
2081
2082         atmel_sha_hmac_key_release(&hmac->hkey);
2083 }
2084
2085 static struct ahash_alg sha_hmac_algs[] = {
2086 {
2087         .init           = atmel_sha_hmac_init,
2088         .update         = atmel_sha_update,
2089         .final          = atmel_sha_final,
2090         .digest         = atmel_sha_hmac_digest,
2091         .setkey         = atmel_sha_hmac_setkey,
2092         .export         = atmel_sha_export,
2093         .import         = atmel_sha_import,
2094         .halg = {
2095                 .digestsize     = SHA1_DIGEST_SIZE,
2096                 .statesize      = sizeof(struct atmel_sha_reqctx),
2097                 .base   = {
2098                         .cra_name               = "hmac(sha1)",
2099                         .cra_driver_name        = "atmel-hmac-sha1",
2100                         .cra_priority           = 100,
2101                         .cra_flags              = CRYPTO_ALG_ASYNC,
2102                         .cra_blocksize          = SHA1_BLOCK_SIZE,
2103                         .cra_ctxsize            = sizeof(struct atmel_sha_hmac_ctx),
2104                         .cra_alignmask          = 0,
2105                         .cra_module             = THIS_MODULE,
2106                         .cra_init               = atmel_sha_hmac_cra_init,
2107                         .cra_exit               = atmel_sha_hmac_cra_exit,
2108                 }
2109         }
2110 },
2111 {
2112         .init           = atmel_sha_hmac_init,
2113         .update         = atmel_sha_update,
2114         .final          = atmel_sha_final,
2115         .digest         = atmel_sha_hmac_digest,
2116         .setkey         = atmel_sha_hmac_setkey,
2117         .export         = atmel_sha_export,
2118         .import         = atmel_sha_import,
2119         .halg = {
2120                 .digestsize     = SHA224_DIGEST_SIZE,
2121                 .statesize      = sizeof(struct atmel_sha_reqctx),
2122                 .base   = {
2123                         .cra_name               = "hmac(sha224)",
2124                         .cra_driver_name        = "atmel-hmac-sha224",
2125                         .cra_priority           = 100,
2126                         .cra_flags              = CRYPTO_ALG_ASYNC,
2127                         .cra_blocksize          = SHA224_BLOCK_SIZE,
2128                         .cra_ctxsize            = sizeof(struct atmel_sha_hmac_ctx),
2129                         .cra_alignmask          = 0,
2130                         .cra_module             = THIS_MODULE,
2131                         .cra_init               = atmel_sha_hmac_cra_init,
2132                         .cra_exit               = atmel_sha_hmac_cra_exit,
2133                 }
2134         }
2135 },
2136 {
2137         .init           = atmel_sha_hmac_init,
2138         .update         = atmel_sha_update,
2139         .final          = atmel_sha_final,
2140         .digest         = atmel_sha_hmac_digest,
2141         .setkey         = atmel_sha_hmac_setkey,
2142         .export         = atmel_sha_export,
2143         .import         = atmel_sha_import,
2144         .halg = {
2145                 .digestsize     = SHA256_DIGEST_SIZE,
2146                 .statesize      = sizeof(struct atmel_sha_reqctx),
2147                 .base   = {
2148                         .cra_name               = "hmac(sha256)",
2149                         .cra_driver_name        = "atmel-hmac-sha256",
2150                         .cra_priority           = 100,
2151                         .cra_flags              = CRYPTO_ALG_ASYNC,
2152                         .cra_blocksize          = SHA256_BLOCK_SIZE,
2153                         .cra_ctxsize            = sizeof(struct atmel_sha_hmac_ctx),
2154                         .cra_alignmask          = 0,
2155                         .cra_module             = THIS_MODULE,
2156                         .cra_init               = atmel_sha_hmac_cra_init,
2157                         .cra_exit               = atmel_sha_hmac_cra_exit,
2158                 }
2159         }
2160 },
2161 {
2162         .init           = atmel_sha_hmac_init,
2163         .update         = atmel_sha_update,
2164         .final          = atmel_sha_final,
2165         .digest         = atmel_sha_hmac_digest,
2166         .setkey         = atmel_sha_hmac_setkey,
2167         .export         = atmel_sha_export,
2168         .import         = atmel_sha_import,
2169         .halg = {
2170                 .digestsize     = SHA384_DIGEST_SIZE,
2171                 .statesize      = sizeof(struct atmel_sha_reqctx),
2172                 .base   = {
2173                         .cra_name               = "hmac(sha384)",
2174                         .cra_driver_name        = "atmel-hmac-sha384",
2175                         .cra_priority           = 100,
2176                         .cra_flags              = CRYPTO_ALG_ASYNC,
2177                         .cra_blocksize          = SHA384_BLOCK_SIZE,
2178                         .cra_ctxsize            = sizeof(struct atmel_sha_hmac_ctx),
2179                         .cra_alignmask          = 0,
2180                         .cra_module             = THIS_MODULE,
2181                         .cra_init               = atmel_sha_hmac_cra_init,
2182                         .cra_exit               = atmel_sha_hmac_cra_exit,
2183                 }
2184         }
2185 },
2186 {
2187         .init           = atmel_sha_hmac_init,
2188         .update         = atmel_sha_update,
2189         .final          = atmel_sha_final,
2190         .digest         = atmel_sha_hmac_digest,
2191         .setkey         = atmel_sha_hmac_setkey,
2192         .export         = atmel_sha_export,
2193         .import         = atmel_sha_import,
2194         .halg = {
2195                 .digestsize     = SHA512_DIGEST_SIZE,
2196                 .statesize      = sizeof(struct atmel_sha_reqctx),
2197                 .base   = {
2198                         .cra_name               = "hmac(sha512)",
2199                         .cra_driver_name        = "atmel-hmac-sha512",
2200                         .cra_priority           = 100,
2201                         .cra_flags              = CRYPTO_ALG_ASYNC,
2202                         .cra_blocksize          = SHA512_BLOCK_SIZE,
2203                         .cra_ctxsize            = sizeof(struct atmel_sha_hmac_ctx),
2204                         .cra_alignmask          = 0,
2205                         .cra_module             = THIS_MODULE,
2206                         .cra_init               = atmel_sha_hmac_cra_init,
2207                         .cra_exit               = atmel_sha_hmac_cra_exit,
2208                 }
2209         }
2210 },
2211 };
2212
2213 #ifdef CONFIG_CRYPTO_DEV_ATMEL_AUTHENC
2214 /* authenc functions */
2215
2216 static int atmel_sha_authenc_init2(struct atmel_sha_dev *dd);
2217 static int atmel_sha_authenc_init_done(struct atmel_sha_dev *dd);
2218 static int atmel_sha_authenc_final_done(struct atmel_sha_dev *dd);
2219
2220
2221 struct atmel_sha_authenc_ctx {
2222         struct crypto_ahash     *tfm;
2223 };
2224
2225 struct atmel_sha_authenc_reqctx {
2226         struct atmel_sha_reqctx base;
2227
2228         atmel_aes_authenc_fn_t  cb;
2229         struct atmel_aes_dev    *aes_dev;
2230
2231         /* _init() parameters. */
2232         struct scatterlist      *assoc;
2233         u32                     assoclen;
2234         u32                     textlen;
2235
2236         /* _final() parameters. */
2237         u32                     *digest;
2238         unsigned int            digestlen;
2239 };
2240
2241 static void atmel_sha_authenc_complete(struct crypto_async_request *areq,
2242                                        int err)
2243 {
2244         struct ahash_request *req = areq->data;
2245         struct atmel_sha_authenc_reqctx *authctx  = ahash_request_ctx(req);
2246
2247         authctx->cb(authctx->aes_dev, err, authctx->base.dd->is_async);
2248 }
2249
2250 static int atmel_sha_authenc_start(struct atmel_sha_dev *dd)
2251 {
2252         struct ahash_request *req = dd->req;
2253         struct atmel_sha_authenc_reqctx *authctx = ahash_request_ctx(req);
2254         int err;
2255
2256         /*
2257          * Force atmel_sha_complete() to call req->base.complete(), ie
2258          * atmel_sha_authenc_complete(), which in turn calls authctx->cb().
2259          */
2260         dd->force_complete = true;
2261
2262         err = atmel_sha_hw_init(dd);
2263         return authctx->cb(authctx->aes_dev, err, dd->is_async);
2264 }
2265
2266 bool atmel_sha_authenc_is_ready(void)
2267 {
2268         struct atmel_sha_ctx dummy;
2269
2270         dummy.dd = NULL;
2271         return (atmel_sha_find_dev(&dummy) != NULL);
2272 }
2273 EXPORT_SYMBOL_GPL(atmel_sha_authenc_is_ready);
2274
2275 unsigned int atmel_sha_authenc_get_reqsize(void)
2276 {
2277         return sizeof(struct atmel_sha_authenc_reqctx);
2278 }
2279 EXPORT_SYMBOL_GPL(atmel_sha_authenc_get_reqsize);
2280
2281 struct atmel_sha_authenc_ctx *atmel_sha_authenc_spawn(unsigned long mode)
2282 {
2283         struct atmel_sha_authenc_ctx *auth;
2284         struct crypto_ahash *tfm;
2285         struct atmel_sha_ctx *tctx;
2286         const char *name;
2287         int err = -EINVAL;
2288
2289         switch (mode & SHA_FLAGS_MODE_MASK) {
2290         case SHA_FLAGS_HMAC_SHA1:
2291                 name = "atmel-hmac-sha1";
2292                 break;
2293
2294         case SHA_FLAGS_HMAC_SHA224:
2295                 name = "atmel-hmac-sha224";
2296                 break;
2297
2298         case SHA_FLAGS_HMAC_SHA256:
2299                 name = "atmel-hmac-sha256";
2300                 break;
2301
2302         case SHA_FLAGS_HMAC_SHA384:
2303                 name = "atmel-hmac-sha384";
2304                 break;
2305
2306         case SHA_FLAGS_HMAC_SHA512:
2307                 name = "atmel-hmac-sha512";
2308                 break;
2309
2310         default:
2311                 goto error;
2312         }
2313
2314         tfm = crypto_alloc_ahash(name,
2315                                  CRYPTO_ALG_TYPE_AHASH,
2316                                  CRYPTO_ALG_TYPE_AHASH_MASK);
2317         if (IS_ERR(tfm)) {
2318                 err = PTR_ERR(tfm);
2319                 goto error;
2320         }
2321         tctx = crypto_ahash_ctx(tfm);
2322         tctx->start = atmel_sha_authenc_start;
2323         tctx->flags = mode;
2324
2325         auth = kzalloc(sizeof(*auth), GFP_KERNEL);
2326         if (!auth) {
2327                 err = -ENOMEM;
2328                 goto err_free_ahash;
2329         }
2330         auth->tfm = tfm;
2331
2332         return auth;
2333
2334 err_free_ahash:
2335         crypto_free_ahash(tfm);
2336 error:
2337         return ERR_PTR(err);
2338 }
2339 EXPORT_SYMBOL_GPL(atmel_sha_authenc_spawn);
2340
2341 void atmel_sha_authenc_free(struct atmel_sha_authenc_ctx *auth)
2342 {
2343         if (auth)
2344                 crypto_free_ahash(auth->tfm);
2345         kfree(auth);
2346 }
2347 EXPORT_SYMBOL_GPL(atmel_sha_authenc_free);
2348
2349 int atmel_sha_authenc_setkey(struct atmel_sha_authenc_ctx *auth,
2350                              const u8 *key, unsigned int keylen,
2351                              u32 *flags)
2352 {
2353         struct crypto_ahash *tfm = auth->tfm;
2354         int err;
2355
2356         crypto_ahash_clear_flags(tfm, CRYPTO_TFM_REQ_MASK);
2357         crypto_ahash_set_flags(tfm, *flags & CRYPTO_TFM_REQ_MASK);
2358         err = crypto_ahash_setkey(tfm, key, keylen);
2359         *flags = crypto_ahash_get_flags(tfm);
2360
2361         return err;
2362 }
2363 EXPORT_SYMBOL_GPL(atmel_sha_authenc_setkey);
2364
2365 int atmel_sha_authenc_schedule(struct ahash_request *req,
2366                                struct atmel_sha_authenc_ctx *auth,
2367                                atmel_aes_authenc_fn_t cb,
2368                                struct atmel_aes_dev *aes_dev)
2369 {
2370         struct atmel_sha_authenc_reqctx *authctx = ahash_request_ctx(req);
2371         struct atmel_sha_reqctx *ctx = &authctx->base;
2372         struct crypto_ahash *tfm = auth->tfm;
2373         struct atmel_sha_ctx *tctx = crypto_ahash_ctx(tfm);
2374         struct atmel_sha_dev *dd;
2375
2376         /* Reset request context (MUST be done first). */
2377         memset(authctx, 0, sizeof(*authctx));
2378
2379         /* Get SHA device. */
2380         dd = atmel_sha_find_dev(tctx);
2381         if (!dd)
2382                 return cb(aes_dev, -ENODEV, false);
2383
2384         /* Init request context. */
2385         ctx->dd = dd;
2386         ctx->buflen = SHA_BUFFER_LEN;
2387         authctx->cb = cb;
2388         authctx->aes_dev = aes_dev;
2389         ahash_request_set_tfm(req, tfm);
2390         ahash_request_set_callback(req, 0, atmel_sha_authenc_complete, req);
2391
2392         return atmel_sha_handle_queue(dd, req);
2393 }
2394 EXPORT_SYMBOL_GPL(atmel_sha_authenc_schedule);
2395
2396 int atmel_sha_authenc_init(struct ahash_request *req,
2397                            struct scatterlist *assoc, unsigned int assoclen,
2398                            unsigned int textlen,
2399                            atmel_aes_authenc_fn_t cb,
2400                            struct atmel_aes_dev *aes_dev)
2401 {
2402         struct atmel_sha_authenc_reqctx *authctx = ahash_request_ctx(req);
2403         struct atmel_sha_reqctx *ctx = &authctx->base;
2404         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
2405         struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
2406         struct atmel_sha_dev *dd = ctx->dd;
2407
2408         if (unlikely(!IS_ALIGNED(assoclen, sizeof(u32))))
2409                 return atmel_sha_complete(dd, -EINVAL);
2410
2411         authctx->cb = cb;
2412         authctx->aes_dev = aes_dev;
2413         authctx->assoc = assoc;
2414         authctx->assoclen = assoclen;
2415         authctx->textlen = textlen;
2416
2417         ctx->flags = hmac->base.flags;
2418         return atmel_sha_hmac_setup(dd, atmel_sha_authenc_init2);
2419 }
2420 EXPORT_SYMBOL_GPL(atmel_sha_authenc_init);
2421
2422 static int atmel_sha_authenc_init2(struct atmel_sha_dev *dd)
2423 {
2424         struct ahash_request *req = dd->req;
2425         struct atmel_sha_authenc_reqctx *authctx = ahash_request_ctx(req);
2426         struct atmel_sha_reqctx *ctx = &authctx->base;
2427         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
2428         struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
2429         size_t hs = ctx->hash_size;
2430         size_t i, num_words = hs / sizeof(u32);
2431         u32 mr, msg_size;
2432
2433         atmel_sha_write(dd, SHA_CR, SHA_CR_WUIHV);
2434         for (i = 0; i < num_words; ++i)
2435                 atmel_sha_write(dd, SHA_REG_DIN(i), hmac->ipad[i]);
2436
2437         atmel_sha_write(dd, SHA_CR, SHA_CR_WUIEHV);
2438         for (i = 0; i < num_words; ++i)
2439                 atmel_sha_write(dd, SHA_REG_DIN(i), hmac->opad[i]);
2440
2441         mr = (SHA_MR_MODE_IDATAR0 |
2442               SHA_MR_HMAC |
2443               SHA_MR_DUALBUFF);
2444         mr |= ctx->flags & SHA_FLAGS_ALGO_MASK;
2445         atmel_sha_write(dd, SHA_MR, mr);
2446
2447         msg_size = authctx->assoclen + authctx->textlen;
2448         atmel_sha_write(dd, SHA_MSR, msg_size);
2449         atmel_sha_write(dd, SHA_BCR, msg_size);
2450
2451         atmel_sha_write(dd, SHA_CR, SHA_CR_FIRST);
2452
2453         /* Process assoc data. */
2454         return atmel_sha_cpu_start(dd, authctx->assoc, authctx->assoclen,
2455                                    true, false,
2456                                    atmel_sha_authenc_init_done);
2457 }
2458
2459 static int atmel_sha_authenc_init_done(struct atmel_sha_dev *dd)
2460 {
2461         struct ahash_request *req = dd->req;
2462         struct atmel_sha_authenc_reqctx *authctx = ahash_request_ctx(req);
2463
2464         return authctx->cb(authctx->aes_dev, 0, dd->is_async);
2465 }
2466
2467 int atmel_sha_authenc_final(struct ahash_request *req,
2468                             u32 *digest, unsigned int digestlen,
2469                             atmel_aes_authenc_fn_t cb,
2470                             struct atmel_aes_dev *aes_dev)
2471 {
2472         struct atmel_sha_authenc_reqctx *authctx = ahash_request_ctx(req);
2473         struct atmel_sha_reqctx *ctx = &authctx->base;
2474         struct atmel_sha_dev *dd = ctx->dd;
2475
2476         switch (ctx->flags & SHA_FLAGS_ALGO_MASK) {
2477         case SHA_FLAGS_SHA1:
2478                 authctx->digestlen = SHA1_DIGEST_SIZE;
2479                 break;
2480
2481         case SHA_FLAGS_SHA224:
2482                 authctx->digestlen = SHA224_DIGEST_SIZE;
2483                 break;
2484
2485         case SHA_FLAGS_SHA256:
2486                 authctx->digestlen = SHA256_DIGEST_SIZE;
2487                 break;
2488
2489         case SHA_FLAGS_SHA384:
2490                 authctx->digestlen = SHA384_DIGEST_SIZE;
2491                 break;
2492
2493         case SHA_FLAGS_SHA512:
2494                 authctx->digestlen = SHA512_DIGEST_SIZE;
2495                 break;
2496
2497         default:
2498                 return atmel_sha_complete(dd, -EINVAL);
2499         }
2500         if (authctx->digestlen > digestlen)
2501                 authctx->digestlen = digestlen;
2502
2503         authctx->cb = cb;
2504         authctx->aes_dev = aes_dev;
2505         authctx->digest = digest;
2506         return atmel_sha_wait_for_data_ready(dd,
2507                                              atmel_sha_authenc_final_done);
2508 }
2509 EXPORT_SYMBOL_GPL(atmel_sha_authenc_final);
2510
2511 static int atmel_sha_authenc_final_done(struct atmel_sha_dev *dd)
2512 {
2513         struct ahash_request *req = dd->req;
2514         struct atmel_sha_authenc_reqctx *authctx = ahash_request_ctx(req);
2515         size_t i, num_words = authctx->digestlen / sizeof(u32);
2516
2517         for (i = 0; i < num_words; ++i)
2518                 authctx->digest[i] = atmel_sha_read(dd, SHA_REG_DIGEST(i));
2519
2520         return atmel_sha_complete(dd, 0);
2521 }
2522
2523 void atmel_sha_authenc_abort(struct ahash_request *req)
2524 {
2525         struct atmel_sha_authenc_reqctx *authctx = ahash_request_ctx(req);
2526         struct atmel_sha_reqctx *ctx = &authctx->base;
2527         struct atmel_sha_dev *dd = ctx->dd;
2528
2529         /* Prevent atmel_sha_complete() from calling req->base.complete(). */
2530         dd->is_async = false;
2531         dd->force_complete = false;
2532         (void)atmel_sha_complete(dd, 0);
2533 }
2534 EXPORT_SYMBOL_GPL(atmel_sha_authenc_abort);
2535
2536 #endif /* CONFIG_CRYPTO_DEV_ATMEL_AUTHENC */
2537
2538
2539 static void atmel_sha_unregister_algs(struct atmel_sha_dev *dd)
2540 {
2541         int i;
2542
2543         if (dd->caps.has_hmac)
2544                 for (i = 0; i < ARRAY_SIZE(sha_hmac_algs); i++)
2545                         crypto_unregister_ahash(&sha_hmac_algs[i]);
2546
2547         for (i = 0; i < ARRAY_SIZE(sha_1_256_algs); i++)
2548                 crypto_unregister_ahash(&sha_1_256_algs[i]);
2549
2550         if (dd->caps.has_sha224)
2551                 crypto_unregister_ahash(&sha_224_alg);
2552
2553         if (dd->caps.has_sha_384_512) {
2554                 for (i = 0; i < ARRAY_SIZE(sha_384_512_algs); i++)
2555                         crypto_unregister_ahash(&sha_384_512_algs[i]);
2556         }
2557 }
2558
2559 static int atmel_sha_register_algs(struct atmel_sha_dev *dd)
2560 {
2561         int err, i, j;
2562
2563         for (i = 0; i < ARRAY_SIZE(sha_1_256_algs); i++) {
2564                 err = crypto_register_ahash(&sha_1_256_algs[i]);
2565                 if (err)
2566                         goto err_sha_1_256_algs;
2567         }
2568
2569         if (dd->caps.has_sha224) {
2570                 err = crypto_register_ahash(&sha_224_alg);
2571                 if (err)
2572                         goto err_sha_224_algs;
2573         }
2574
2575         if (dd->caps.has_sha_384_512) {
2576                 for (i = 0; i < ARRAY_SIZE(sha_384_512_algs); i++) {
2577                         err = crypto_register_ahash(&sha_384_512_algs[i]);
2578                         if (err)
2579                                 goto err_sha_384_512_algs;
2580                 }
2581         }
2582
2583         if (dd->caps.has_hmac) {
2584                 for (i = 0; i < ARRAY_SIZE(sha_hmac_algs); i++) {
2585                         err = crypto_register_ahash(&sha_hmac_algs[i]);
2586                         if (err)
2587                                 goto err_sha_hmac_algs;
2588                 }
2589         }
2590
2591         return 0;
2592
2593         /*i = ARRAY_SIZE(sha_hmac_algs);*/
2594 err_sha_hmac_algs:
2595         for (j = 0; j < i; j++)
2596                 crypto_unregister_ahash(&sha_hmac_algs[j]);
2597         i = ARRAY_SIZE(sha_384_512_algs);
2598 err_sha_384_512_algs:
2599         for (j = 0; j < i; j++)
2600                 crypto_unregister_ahash(&sha_384_512_algs[j]);
2601         crypto_unregister_ahash(&sha_224_alg);
2602 err_sha_224_algs:
2603         i = ARRAY_SIZE(sha_1_256_algs);
2604 err_sha_1_256_algs:
2605         for (j = 0; j < i; j++)
2606                 crypto_unregister_ahash(&sha_1_256_algs[j]);
2607
2608         return err;
2609 }
2610
2611 static bool atmel_sha_filter(struct dma_chan *chan, void *slave)
2612 {
2613         struct at_dma_slave     *sl = slave;
2614
2615         if (sl && sl->dma_dev == chan->device->dev) {
2616                 chan->private = sl;
2617                 return true;
2618         } else {
2619                 return false;
2620         }
2621 }
2622
2623 static int atmel_sha_dma_init(struct atmel_sha_dev *dd,
2624                                 struct crypto_platform_data *pdata)
2625 {
2626         int err = -ENOMEM;
2627         dma_cap_mask_t mask_in;
2628
2629         /* Try to grab DMA channel */
2630         dma_cap_zero(mask_in);
2631         dma_cap_set(DMA_SLAVE, mask_in);
2632
2633         dd->dma_lch_in.chan = dma_request_slave_channel_compat(mask_in,
2634                         atmel_sha_filter, &pdata->dma_slave->rxdata, dd->dev, "tx");
2635         if (!dd->dma_lch_in.chan) {
2636                 dev_warn(dd->dev, "no DMA channel available\n");
2637                 return err;
2638         }
2639
2640         dd->dma_lch_in.dma_conf.direction = DMA_MEM_TO_DEV;
2641         dd->dma_lch_in.dma_conf.dst_addr = dd->phys_base +
2642                 SHA_REG_DIN(0);
2643         dd->dma_lch_in.dma_conf.src_maxburst = 1;
2644         dd->dma_lch_in.dma_conf.src_addr_width =
2645                 DMA_SLAVE_BUSWIDTH_4_BYTES;
2646         dd->dma_lch_in.dma_conf.dst_maxburst = 1;
2647         dd->dma_lch_in.dma_conf.dst_addr_width =
2648                 DMA_SLAVE_BUSWIDTH_4_BYTES;
2649         dd->dma_lch_in.dma_conf.device_fc = false;
2650
2651         return 0;
2652 }
2653
2654 static void atmel_sha_dma_cleanup(struct atmel_sha_dev *dd)
2655 {
2656         dma_release_channel(dd->dma_lch_in.chan);
2657 }
2658
2659 static void atmel_sha_get_cap(struct atmel_sha_dev *dd)
2660 {
2661
2662         dd->caps.has_dma = 0;
2663         dd->caps.has_dualbuff = 0;
2664         dd->caps.has_sha224 = 0;
2665         dd->caps.has_sha_384_512 = 0;
2666         dd->caps.has_uihv = 0;
2667         dd->caps.has_hmac = 0;
2668
2669         /* keep only major version number */
2670         switch (dd->hw_version & 0xff0) {
2671         case 0x510:
2672                 dd->caps.has_dma = 1;
2673                 dd->caps.has_dualbuff = 1;
2674                 dd->caps.has_sha224 = 1;
2675                 dd->caps.has_sha_384_512 = 1;
2676                 dd->caps.has_uihv = 1;
2677                 dd->caps.has_hmac = 1;
2678                 break;
2679         case 0x420:
2680                 dd->caps.has_dma = 1;
2681                 dd->caps.has_dualbuff = 1;
2682                 dd->caps.has_sha224 = 1;
2683                 dd->caps.has_sha_384_512 = 1;
2684                 dd->caps.has_uihv = 1;
2685                 break;
2686         case 0x410:
2687                 dd->caps.has_dma = 1;
2688                 dd->caps.has_dualbuff = 1;
2689                 dd->caps.has_sha224 = 1;
2690                 dd->caps.has_sha_384_512 = 1;
2691                 break;
2692         case 0x400:
2693                 dd->caps.has_dma = 1;
2694                 dd->caps.has_dualbuff = 1;
2695                 dd->caps.has_sha224 = 1;
2696                 break;
2697         case 0x320:
2698                 break;
2699         default:
2700                 dev_warn(dd->dev,
2701                                 "Unmanaged sha version, set minimum capabilities\n");
2702                 break;
2703         }
2704 }
2705
2706 #if defined(CONFIG_OF)
2707 static const struct of_device_id atmel_sha_dt_ids[] = {
2708         { .compatible = "atmel,at91sam9g46-sha" },
2709         { /* sentinel */ }
2710 };
2711
2712 MODULE_DEVICE_TABLE(of, atmel_sha_dt_ids);
2713
2714 static struct crypto_platform_data *atmel_sha_of_init(struct platform_device *pdev)
2715 {
2716         struct device_node *np = pdev->dev.of_node;
2717         struct crypto_platform_data *pdata;
2718
2719         if (!np) {
2720                 dev_err(&pdev->dev, "device node not found\n");
2721                 return ERR_PTR(-EINVAL);
2722         }
2723
2724         pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
2725         if (!pdata) {
2726                 dev_err(&pdev->dev, "could not allocate memory for pdata\n");
2727                 return ERR_PTR(-ENOMEM);
2728         }
2729
2730         pdata->dma_slave = devm_kzalloc(&pdev->dev,
2731                                         sizeof(*(pdata->dma_slave)),
2732                                         GFP_KERNEL);
2733         if (!pdata->dma_slave) {
2734                 dev_err(&pdev->dev, "could not allocate memory for dma_slave\n");
2735                 return ERR_PTR(-ENOMEM);
2736         }
2737
2738         return pdata;
2739 }
2740 #else /* CONFIG_OF */
2741 static inline struct crypto_platform_data *atmel_sha_of_init(struct platform_device *dev)
2742 {
2743         return ERR_PTR(-EINVAL);
2744 }
2745 #endif
2746
2747 static int atmel_sha_probe(struct platform_device *pdev)
2748 {
2749         struct atmel_sha_dev *sha_dd;
2750         struct crypto_platform_data     *pdata;
2751         struct device *dev = &pdev->dev;
2752         struct resource *sha_res;
2753         int err;
2754
2755         sha_dd = devm_kzalloc(&pdev->dev, sizeof(*sha_dd), GFP_KERNEL);
2756         if (sha_dd == NULL) {
2757                 dev_err(dev, "unable to alloc data struct.\n");
2758                 err = -ENOMEM;
2759                 goto sha_dd_err;
2760         }
2761
2762         sha_dd->dev = dev;
2763
2764         platform_set_drvdata(pdev, sha_dd);
2765
2766         INIT_LIST_HEAD(&sha_dd->list);
2767         spin_lock_init(&sha_dd->lock);
2768
2769         tasklet_init(&sha_dd->done_task, atmel_sha_done_task,
2770                                         (unsigned long)sha_dd);
2771         tasklet_init(&sha_dd->queue_task, atmel_sha_queue_task,
2772                                         (unsigned long)sha_dd);
2773
2774         crypto_init_queue(&sha_dd->queue, ATMEL_SHA_QUEUE_LENGTH);
2775
2776         sha_dd->irq = -1;
2777
2778         /* Get the base address */
2779         sha_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2780         if (!sha_res) {
2781                 dev_err(dev, "no MEM resource info\n");
2782                 err = -ENODEV;
2783                 goto res_err;
2784         }
2785         sha_dd->phys_base = sha_res->start;
2786
2787         /* Get the IRQ */
2788         sha_dd->irq = platform_get_irq(pdev,  0);
2789         if (sha_dd->irq < 0) {
2790                 dev_err(dev, "no IRQ resource info\n");
2791                 err = sha_dd->irq;
2792                 goto res_err;
2793         }
2794
2795         err = devm_request_irq(&pdev->dev, sha_dd->irq, atmel_sha_irq,
2796                                IRQF_SHARED, "atmel-sha", sha_dd);
2797         if (err) {
2798                 dev_err(dev, "unable to request sha irq.\n");
2799                 goto res_err;
2800         }
2801
2802         /* Initializing the clock */
2803         sha_dd->iclk = devm_clk_get(&pdev->dev, "sha_clk");
2804         if (IS_ERR(sha_dd->iclk)) {
2805                 dev_err(dev, "clock initialization failed.\n");
2806                 err = PTR_ERR(sha_dd->iclk);
2807                 goto res_err;
2808         }
2809
2810         sha_dd->io_base = devm_ioremap_resource(&pdev->dev, sha_res);
2811         if (IS_ERR(sha_dd->io_base)) {
2812                 dev_err(dev, "can't ioremap\n");
2813                 err = PTR_ERR(sha_dd->io_base);
2814                 goto res_err;
2815         }
2816
2817         err = clk_prepare(sha_dd->iclk);
2818         if (err)
2819                 goto res_err;
2820
2821         atmel_sha_hw_version_init(sha_dd);
2822
2823         atmel_sha_get_cap(sha_dd);
2824
2825         if (sha_dd->caps.has_dma) {
2826                 pdata = pdev->dev.platform_data;
2827                 if (!pdata) {
2828                         pdata = atmel_sha_of_init(pdev);
2829                         if (IS_ERR(pdata)) {
2830                                 dev_err(&pdev->dev, "platform data not available\n");
2831                                 err = PTR_ERR(pdata);
2832                                 goto iclk_unprepare;
2833                         }
2834                 }
2835                 if (!pdata->dma_slave) {
2836                         err = -ENXIO;
2837                         goto iclk_unprepare;
2838                 }
2839                 err = atmel_sha_dma_init(sha_dd, pdata);
2840                 if (err)
2841                         goto err_sha_dma;
2842
2843                 dev_info(dev, "using %s for DMA transfers\n",
2844                                 dma_chan_name(sha_dd->dma_lch_in.chan));
2845         }
2846
2847         spin_lock(&atmel_sha.lock);
2848         list_add_tail(&sha_dd->list, &atmel_sha.dev_list);
2849         spin_unlock(&atmel_sha.lock);
2850
2851         err = atmel_sha_register_algs(sha_dd);
2852         if (err)
2853                 goto err_algs;
2854
2855         dev_info(dev, "Atmel SHA1/SHA256%s%s\n",
2856                         sha_dd->caps.has_sha224 ? "/SHA224" : "",
2857                         sha_dd->caps.has_sha_384_512 ? "/SHA384/SHA512" : "");
2858
2859         return 0;
2860
2861 err_algs:
2862         spin_lock(&atmel_sha.lock);
2863         list_del(&sha_dd->list);
2864         spin_unlock(&atmel_sha.lock);
2865         if (sha_dd->caps.has_dma)
2866                 atmel_sha_dma_cleanup(sha_dd);
2867 err_sha_dma:
2868 iclk_unprepare:
2869         clk_unprepare(sha_dd->iclk);
2870 res_err:
2871         tasklet_kill(&sha_dd->queue_task);
2872         tasklet_kill(&sha_dd->done_task);
2873 sha_dd_err:
2874         dev_err(dev, "initialization failed.\n");
2875
2876         return err;
2877 }
2878
2879 static int atmel_sha_remove(struct platform_device *pdev)
2880 {
2881         struct atmel_sha_dev *sha_dd;
2882
2883         sha_dd = platform_get_drvdata(pdev);
2884         if (!sha_dd)
2885                 return -ENODEV;
2886         spin_lock(&atmel_sha.lock);
2887         list_del(&sha_dd->list);
2888         spin_unlock(&atmel_sha.lock);
2889
2890         atmel_sha_unregister_algs(sha_dd);
2891
2892         tasklet_kill(&sha_dd->queue_task);
2893         tasklet_kill(&sha_dd->done_task);
2894
2895         if (sha_dd->caps.has_dma)
2896                 atmel_sha_dma_cleanup(sha_dd);
2897
2898         clk_unprepare(sha_dd->iclk);
2899
2900         return 0;
2901 }
2902
2903 static struct platform_driver atmel_sha_driver = {
2904         .probe          = atmel_sha_probe,
2905         .remove         = atmel_sha_remove,
2906         .driver         = {
2907                 .name   = "atmel_sha",
2908                 .of_match_table = of_match_ptr(atmel_sha_dt_ids),
2909         },
2910 };
2911
2912 module_platform_driver(atmel_sha_driver);
2913
2914 MODULE_DESCRIPTION("Atmel SHA (1/256/224/384/512) hw acceleration support.");
2915 MODULE_LICENSE("GPL v2");
2916 MODULE_AUTHOR("Nicolas Royer - Eukréa Electromatique");