drivers/crypto/atmel-sha.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Cryptographic API.
   4  *
   5  * Support for ATMEL SHA1/SHA256 HW acceleration.
   6  *
   7  * Copyright (c) 2012 Eukréa Electromatique - ATMEL
   8  * Author: Nicolas Royer <nicolas@eukrea.com>
   9  *
  10  * Some ideas are from omap-sham.c drivers.
  11  */
  12
  13
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/slab.h>
  17 #include <linux/err.h>
  18 #include <linux/clk.h>
  19 #include <linux/io.h>
  20 #include <linux/hw_random.h>
  21 #include <linux/platform_device.h>
  22
  23 #include <linux/device.h>
  24 #include <linux/dmaengine.h>
  25 #include <linux/init.h>
  26 #include <linux/errno.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/irq.h>
  29 #include <linux/scatterlist.h>
  30 #include <linux/dma-mapping.h>
  31 #include <linux/of_device.h>
  32 #include <linux/delay.h>
  33 #include <linux/crypto.h>
  34 #include <crypto/scatterwalk.h>
  35 #include <crypto/algapi.h>
  36 #include <crypto/sha1.h>
  37 #include <crypto/sha2.h>
  38 #include <crypto/hash.h>
  39 #include <crypto/internal/hash.h>
  40 #include "atmel-sha-regs.h"
  41 #include "atmel-authenc.h"
  42
  43 #define ATMEL_SHA_PRIORITY      300
  44
  45 /* SHA flags */
  46 #define SHA_FLAGS_BUSY                  BIT(0)
  47 #define SHA_FLAGS_FINAL                 BIT(1)
  48 #define SHA_FLAGS_DMA_ACTIVE    BIT(2)
  49 #define SHA_FLAGS_OUTPUT_READY  BIT(3)
  50 #define SHA_FLAGS_INIT                  BIT(4)
  51 #define SHA_FLAGS_CPU                   BIT(5)
  52 #define SHA_FLAGS_DMA_READY             BIT(6)
  53 #define SHA_FLAGS_DUMP_REG      BIT(7)
  54
  55 /* bits[11:8] are reserved. */
  56
  57 #define SHA_FLAGS_FINUP         BIT(16)
  58 #define SHA_FLAGS_SG            BIT(17)
  59 #define SHA_FLAGS_ERROR         BIT(23)
  60 #define SHA_FLAGS_PAD           BIT(24)
  61 #define SHA_FLAGS_RESTORE       BIT(25)
  62 #define SHA_FLAGS_IDATAR0       BIT(26)
  63 #define SHA_FLAGS_WAIT_DATARDY  BIT(27)
  64
  65 #define SHA_OP_INIT     0
  66 #define SHA_OP_UPDATE   1
  67 #define SHA_OP_FINAL    2
  68 #define SHA_OP_DIGEST   3
  69
  70 #define SHA_BUFFER_LEN          (PAGE_SIZE / 16)
  71
  72 #define ATMEL_SHA_DMA_THRESHOLD         56
  73
  74 struct atmel_sha_caps {
  75         bool    has_dma;
  76         bool    has_dualbuff;
  77         bool    has_sha224;
  78         bool    has_sha_384_512;
  79         bool    has_uihv;
  80         bool    has_hmac;
  81 };
  82
  83 struct atmel_sha_dev;
  84
  85 /*
  86  * .statesize = sizeof(struct atmel_sha_reqctx) must be <= PAGE_SIZE / 8 as
  87  * tested by the ahash_prepare_alg() function.
  88  */
  89 struct atmel_sha_reqctx {
  90         struct atmel_sha_dev    *dd;
  91         unsigned long   flags;
  92         unsigned long   op;
  93
  94         u8      digest[SHA512_DIGEST_SIZE] __aligned(sizeof(u32));
  95         u64     digcnt[2];
  96         size_t  bufcnt;
  97         size_t  buflen;
  98         dma_addr_t      dma_addr;
  99
 100         /* walk state */
 101         struct scatterlist      *sg;
 102         unsigned int    offset; /* offset in current sg */
 103         unsigned int    total;  /* total request */
 104
 105         size_t block_size;
 106         size_t hash_size;
 107
 108         u8 buffer[SHA_BUFFER_LEN + SHA512_BLOCK_SIZE] __aligned(sizeof(u32));
 109 };
 110
 111 typedef int (*atmel_sha_fn_t)(struct atmel_sha_dev *);
 112
 113 struct atmel_sha_ctx {
 114         struct atmel_sha_dev    *dd;
 115         atmel_sha_fn_t          start;
 116
 117         unsigned long           flags;
 118 };
 119
 120 #define ATMEL_SHA_QUEUE_LENGTH  50
 121
 122 struct atmel_sha_dma {
 123         struct dma_chan                 *chan;
 124         struct dma_slave_config dma_conf;
 125         struct scatterlist      *sg;
 126         int                     nents;
 127         unsigned int            last_sg_length;
 128 };
 129
 130 struct atmel_sha_dev {
 131         struct list_head        list;
 132         unsigned long           phys_base;
 133         struct device           *dev;
 134         struct clk                      *iclk;
 135         int                                     irq;
 136         void __iomem            *io_base;
 137
 138         spinlock_t              lock;
 139         struct tasklet_struct   done_task;
 140         struct tasklet_struct   queue_task;
 141
 142         unsigned long           flags;
 143         struct crypto_queue     queue;
 144         struct ahash_request    *req;
 145         bool                    is_async;
 146         bool                    force_complete;
 147         atmel_sha_fn_t          resume;
 148         atmel_sha_fn_t          cpu_transfer_complete;
 149
 150         struct atmel_sha_dma    dma_lch_in;
 151
 152         struct atmel_sha_caps   caps;
 153
 154         struct scatterlist      tmp;
 155
 156         u32     hw_version;
 157 };
 158
 159 struct atmel_sha_drv {
 160         struct list_head        dev_list;
 161         spinlock_t              lock;
 162 };
 163
 164 static struct atmel_sha_drv atmel_sha = {
 165         .dev_list = LIST_HEAD_INIT(atmel_sha.dev_list),
 166         .lock = __SPIN_LOCK_UNLOCKED(atmel_sha.lock),
 167 };
 168
 169 #ifdef VERBOSE_DEBUG
 170 static const char *atmel_sha_reg_name(u32 offset, char *tmp, size_t sz, bool wr)
 171 {
 172         switch (offset) {
 173         case SHA_CR:
 174                 return "CR";
 175
 176         case SHA_MR:
 177                 return "MR";
 178
 179         case SHA_IER:
 180                 return "IER";
 181
 182         case SHA_IDR:
 183                 return "IDR";
 184
 185         case SHA_IMR:
 186                 return "IMR";
 187
 188         case SHA_ISR:
 189                 return "ISR";
 190
 191         case SHA_MSR:
 192                 return "MSR";
 193
 194         case SHA_BCR:
 195                 return "BCR";
 196
 197         case SHA_REG_DIN(0):
 198         case SHA_REG_DIN(1):
 199         case SHA_REG_DIN(2):
 200         case SHA_REG_DIN(3):
 201         case SHA_REG_DIN(4):
 202         case SHA_REG_DIN(5):
 203         case SHA_REG_DIN(6):
 204         case SHA_REG_DIN(7):
 205         case SHA_REG_DIN(8):
 206         case SHA_REG_DIN(9):
 207         case SHA_REG_DIN(10):
 208         case SHA_REG_DIN(11):
 209         case SHA_REG_DIN(12):
 210         case SHA_REG_DIN(13):
 211         case SHA_REG_DIN(14):
 212         case SHA_REG_DIN(15):
 213                 snprintf(tmp, sz, "IDATAR[%u]", (offset - SHA_REG_DIN(0)) >> 2);
 214                 break;
 215
 216         case SHA_REG_DIGEST(0):
 217         case SHA_REG_DIGEST(1):
 218         case SHA_REG_DIGEST(2):
 219         case SHA_REG_DIGEST(3):
 220         case SHA_REG_DIGEST(4):
 221         case SHA_REG_DIGEST(5):
 222         case SHA_REG_DIGEST(6):
 223         case SHA_REG_DIGEST(7):
 224         case SHA_REG_DIGEST(8):
 225         case SHA_REG_DIGEST(9):
 226         case SHA_REG_DIGEST(10):
 227         case SHA_REG_DIGEST(11):
 228         case SHA_REG_DIGEST(12):
 229         case SHA_REG_DIGEST(13):
 230         case SHA_REG_DIGEST(14):
 231         case SHA_REG_DIGEST(15):
 232                 if (wr)
 233                         snprintf(tmp, sz, "IDATAR[%u]",
 234                                  16u + ((offset - SHA_REG_DIGEST(0)) >> 2));
 235                 else
 236                         snprintf(tmp, sz, "ODATAR[%u]",
 237                                  (offset - SHA_REG_DIGEST(0)) >> 2);
 238                 break;
 239
 240         case SHA_HW_VERSION:
 241                 return "HWVER";
 242
 243         default:
 244                 snprintf(tmp, sz, "0x%02x", offset);
 245                 break;
 246         }
 247
 248         return tmp;
 249 }
 250
 251 #endif /* VERBOSE_DEBUG */
 252
 253 static inline u32 atmel_sha_read(struct atmel_sha_dev *dd, u32 offset)
 254 {
 255         u32 value = readl_relaxed(dd->io_base + offset);
 256
 257 #ifdef VERBOSE_DEBUG
 258         if (dd->flags & SHA_FLAGS_DUMP_REG) {
 259                 char tmp[16];
 260
 261                 dev_vdbg(dd->dev, "read 0x%08x from %s\n", value,
 262                          atmel_sha_reg_name(offset, tmp, sizeof(tmp), false));
 263         }
 264 #endif /* VERBOSE_DEBUG */
 265
 266         return value;
 267 }
 268
 269 static inline void atmel_sha_write(struct atmel_sha_dev *dd,
 270                                         u32 offset, u32 value)
 271 {
 272 #ifdef VERBOSE_DEBUG
 273         if (dd->flags & SHA_FLAGS_DUMP_REG) {
 274                 char tmp[16];
 275
 276                 dev_vdbg(dd->dev, "write 0x%08x into %s\n", value,
 277                          atmel_sha_reg_name(offset, tmp, sizeof(tmp), true));
 278         }
 279 #endif /* VERBOSE_DEBUG */
 280
 281         writel_relaxed(value, dd->io_base + offset);
 282 }
 283
 284 static inline int atmel_sha_complete(struct atmel_sha_dev *dd, int err)
 285 {
 286         struct ahash_request *req = dd->req;
 287
 288         dd->flags &= ~(SHA_FLAGS_BUSY | SHA_FLAGS_FINAL | SHA_FLAGS_CPU |
 289                        SHA_FLAGS_DMA_READY | SHA_FLAGS_OUTPUT_READY |
 290                        SHA_FLAGS_DUMP_REG);
 291
 292         clk_disable(dd->iclk);
 293
 294         if ((dd->is_async || dd->force_complete) && req->base.complete)
 295                 req->base.complete(&req->base, err);
 296
 297         /* handle new request */
 298         tasklet_schedule(&dd->queue_task);
 299
 300         return err;
 301 }
 302
 303 static size_t atmel_sha_append_sg(struct atmel_sha_reqctx *ctx)
 304 {
 305         size_t count;
 306
 307         while ((ctx->bufcnt < ctx->buflen) && ctx->total) {
 308                 count = min(ctx->sg->length - ctx->offset, ctx->total);
 309                 count = min(count, ctx->buflen - ctx->bufcnt);
 310
 311                 if (count <= 0) {
 312                         /*
 313                         * Check if count <= 0 because the buffer is full or
 314                         * because the sg length is 0. In the latest case,
 315                         * check if there is another sg in the list, a 0 length
 316                         * sg doesn't necessarily mean the end of the sg list.
 317                         */
 318                         if ((ctx->sg->length == 0) && !sg_is_last(ctx->sg)) {
 319                                 ctx->sg = sg_next(ctx->sg);
 320                                 continue;
 321                         } else {
 322                                 break;
 323                         }
 324                 }
 325
 326                 scatterwalk_map_and_copy(ctx->buffer + ctx->bufcnt, ctx->sg,
 327                         ctx->offset, count, 0);
 328
 329                 ctx->bufcnt += count;
 330                 ctx->offset += count;
 331                 ctx->total -= count;
 332
 333                 if (ctx->offset == ctx->sg->length) {
 334                         ctx->sg = sg_next(ctx->sg);
 335                         if (ctx->sg)
 336                                 ctx->offset = 0;
 337                         else
 338                                 ctx->total = 0;
 339                 }
 340         }
 341
 342         return 0;
 343 }
 344
 345 /*
 346  * The purpose of this padding is to ensure that the padded message is a
 347  * multiple of 512 bits (SHA1/SHA224/SHA256) or 1024 bits (SHA384/SHA512).
 348  * The bit "1" is appended at the end of the message followed by
 349  * "padlen-1" zero bits. Then a 64 bits block (SHA1/SHA224/SHA256) or
 350  * 128 bits block (SHA384/SHA512) equals to the message length in bits
 351  * is appended.
 352  *
 353  * For SHA1/SHA224/SHA256, padlen is calculated as followed:
 354  *  - if message length < 56 bytes then padlen = 56 - message length
 355  *  - else padlen = 64 + 56 - message length
 356  *
 357  * For SHA384/SHA512, padlen is calculated as followed:
 358  *  - if message length < 112 bytes then padlen = 112 - message length
 359  *  - else padlen = 128 + 112 - message length
 360  */
 361 static void atmel_sha_fill_padding(struct atmel_sha_reqctx *ctx, int length)
 362 {
 363         unsigned int index, padlen;
 364         __be64 bits[2];
 365         u64 size[2];
 366
 367         size[0] = ctx->digcnt[0];
 368         size[1] = ctx->digcnt[1];
 369
 370         size[0] += ctx->bufcnt;
 371         if (size[0] < ctx->bufcnt)
 372                 size[1]++;
 373
 374         size[0] += length;
 375         if (size[0]  < length)
 376                 size[1]++;
 377
 378         bits[1] = cpu_to_be64(size[0] << 3);
 379         bits[0] = cpu_to_be64(size[1] << 3 | size[0] >> 61);
 380
 381         switch (ctx->flags & SHA_FLAGS_ALGO_MASK) {
 382         case SHA_FLAGS_SHA384:
 383         case SHA_FLAGS_SHA512:
 384                 index = ctx->bufcnt & 0x7f;
 385                 padlen = (index < 112) ? (112 - index) : ((128+112) - index);
 386                 *(ctx->buffer + ctx->bufcnt) = 0x80;
 387                 memset(ctx->buffer + ctx->bufcnt + 1, 0, padlen-1);
 388                 memcpy(ctx->buffer + ctx->bufcnt + padlen, bits, 16);
 389                 ctx->bufcnt += padlen + 16;
 390                 ctx->flags |= SHA_FLAGS_PAD;
 391                 break;
 392
 393         default:
 394                 index = ctx->bufcnt & 0x3f;
 395                 padlen = (index < 56) ? (56 - index) : ((64+56) - index);
 396                 *(ctx->buffer + ctx->bufcnt) = 0x80;
 397                 memset(ctx->buffer + ctx->bufcnt + 1, 0, padlen-1);
 398                 memcpy(ctx->buffer + ctx->bufcnt + padlen, &bits[1], 8);
 399                 ctx->bufcnt += padlen + 8;
 400                 ctx->flags |= SHA_FLAGS_PAD;
 401                 break;
 402         }
 403 }
 404
 405 static struct atmel_sha_dev *atmel_sha_find_dev(struct atmel_sha_ctx *tctx)
 406 {
 407         struct atmel_sha_dev *dd = NULL;
 408         struct atmel_sha_dev *tmp;
 409
 410         spin_lock_bh(&atmel_sha.lock);
 411         if (!tctx->dd) {
 412                 list_for_each_entry(tmp, &atmel_sha.dev_list, list) {
 413                         dd = tmp;
 414                         break;
 415                 }
 416                 tctx->dd = dd;
 417         } else {
 418                 dd = tctx->dd;
 419         }
 420
 421         spin_unlock_bh(&atmel_sha.lock);
 422
 423         return dd;
 424 }
 425
 426 static int atmel_sha_init(struct ahash_request *req)
 427 {
 428         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 429         struct atmel_sha_ctx *tctx = crypto_ahash_ctx(tfm);
 430         struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
 431         struct atmel_sha_dev *dd = atmel_sha_find_dev(tctx);
 432
 433         ctx->dd = dd;
 434
 435         ctx->flags = 0;
 436
 437         dev_dbg(dd->dev, "init: digest size: %u\n",
 438                 crypto_ahash_digestsize(tfm));
 439
 440         switch (crypto_ahash_digestsize(tfm)) {
 441         case SHA1_DIGEST_SIZE:
 442                 ctx->flags |= SHA_FLAGS_SHA1;
 443                 ctx->block_size = SHA1_BLOCK_SIZE;
 444                 break;
 445         case SHA224_DIGEST_SIZE:
 446                 ctx->flags |= SHA_FLAGS_SHA224;
 447                 ctx->block_size = SHA224_BLOCK_SIZE;
 448                 break;
 449         case SHA256_DIGEST_SIZE:
 450                 ctx->flags |= SHA_FLAGS_SHA256;
 451                 ctx->block_size = SHA256_BLOCK_SIZE;
 452                 break;
 453         case SHA384_DIGEST_SIZE:
 454                 ctx->flags |= SHA_FLAGS_SHA384;
 455                 ctx->block_size = SHA384_BLOCK_SIZE;
 456                 break;
 457         case SHA512_DIGEST_SIZE:
 458                 ctx->flags |= SHA_FLAGS_SHA512;
 459                 ctx->block_size = SHA512_BLOCK_SIZE;
 460                 break;
 461         default:
 462                 return -EINVAL;
 463         }
 464
 465         ctx->bufcnt = 0;
 466         ctx->digcnt[0] = 0;
 467         ctx->digcnt[1] = 0;
 468         ctx->buflen = SHA_BUFFER_LEN;
 469
 470         return 0;
 471 }
 472
 473 static void atmel_sha_write_ctrl(struct atmel_sha_dev *dd, int dma)
 474 {
 475         struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
 476         u32 valmr = SHA_MR_MODE_AUTO;
 477         unsigned int i, hashsize = 0;
 478
 479         if (likely(dma)) {
 480                 if (!dd->caps.has_dma)
 481                         atmel_sha_write(dd, SHA_IER, SHA_INT_TXBUFE);
 482                 valmr = SHA_MR_MODE_PDC;
 483                 if (dd->caps.has_dualbuff)
 484                         valmr |= SHA_MR_DUALBUFF;
 485         } else {
 486                 atmel_sha_write(dd, SHA_IER, SHA_INT_DATARDY);
 487         }
 488
 489         switch (ctx->flags & SHA_FLAGS_ALGO_MASK) {
 490         case SHA_FLAGS_SHA1:
 491                 valmr |= SHA_MR_ALGO_SHA1;
 492                 hashsize = SHA1_DIGEST_SIZE;
 493                 break;
 494
 495         case SHA_FLAGS_SHA224:
 496                 valmr |= SHA_MR_ALGO_SHA224;
 497                 hashsize = SHA256_DIGEST_SIZE;
 498                 break;
 499
 500         case SHA_FLAGS_SHA256:
 501                 valmr |= SHA_MR_ALGO_SHA256;
 502                 hashsize = SHA256_DIGEST_SIZE;
 503                 break;
 504
 505         case SHA_FLAGS_SHA384:
 506                 valmr |= SHA_MR_ALGO_SHA384;
 507                 hashsize = SHA512_DIGEST_SIZE;
 508                 break;
 509
 510         case SHA_FLAGS_SHA512:
 511                 valmr |= SHA_MR_ALGO_SHA512;
 512                 hashsize = SHA512_DIGEST_SIZE;
 513                 break;
 514
 515         default:
 516                 break;
 517         }
 518
 519         /* Setting CR_FIRST only for the first iteration */
 520         if (!(ctx->digcnt[0] || ctx->digcnt[1])) {
 521                 atmel_sha_write(dd, SHA_CR, SHA_CR_FIRST);
 522         } else if (dd->caps.has_uihv && (ctx->flags & SHA_FLAGS_RESTORE)) {
 523                 const u32 *hash = (const u32 *)ctx->digest;
 524
 525                 /*
 526                  * Restore the hardware context: update the User Initialize
 527                  * Hash Value (UIHV) with the value saved when the latest
 528                  * 'update' operation completed on this very same crypto
 529                  * request.
 530                  */
 531                 ctx->flags &= ~SHA_FLAGS_RESTORE;
 532                 atmel_sha_write(dd, SHA_CR, SHA_CR_WUIHV);
 533                 for (i = 0; i < hashsize / sizeof(u32); ++i)
 534                         atmel_sha_write(dd, SHA_REG_DIN(i), hash[i]);
 535                 atmel_sha_write(dd, SHA_CR, SHA_CR_FIRST);
 536                 valmr |= SHA_MR_UIHV;
 537         }
 538         /*
 539          * WARNING: If the UIHV feature is not available, the hardware CANNOT
 540          * process concurrent requests: the internal registers used to store
 541          * the hash/digest are still set to the partial digest output values
 542          * computed during the latest round.
 543          */
 544
 545         atmel_sha_write(dd, SHA_MR, valmr);
 546 }
 547
 548 static inline int atmel_sha_wait_for_data_ready(struct atmel_sha_dev *dd,
 549                                                 atmel_sha_fn_t resume)
 550 {
 551         u32 isr = atmel_sha_read(dd, SHA_ISR);
 552
 553         if (unlikely(isr & SHA_INT_DATARDY))
 554                 return resume(dd);
 555
 556         dd->resume = resume;
 557         atmel_sha_write(dd, SHA_IER, SHA_INT_DATARDY);
 558         return -EINPROGRESS;
 559 }
 560
 561 static int atmel_sha_xmit_cpu(struct atmel_sha_dev *dd, const u8 *buf,
 562                               size_t length, int final)
 563 {
 564         struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
 565         int count, len32;
 566         const u32 *buffer = (const u32 *)buf;
 567
 568         dev_dbg(dd->dev, "xmit_cpu: digcnt: 0x%llx 0x%llx, length: %zd, final: %d\n",
 569                 ctx->digcnt[1], ctx->digcnt[0], length, final);
 570
 571         atmel_sha_write_ctrl(dd, 0);
 572
 573         /* should be non-zero before next lines to disable clocks later */
 574         ctx->digcnt[0] += length;
 575         if (ctx->digcnt[0] < length)
 576                 ctx->digcnt[1]++;
 577
 578         if (final)
 579                 dd->flags |= SHA_FLAGS_FINAL; /* catch last interrupt */
 580
 581         len32 = DIV_ROUND_UP(length, sizeof(u32));
 582
 583         dd->flags |= SHA_FLAGS_CPU;
 584
 585         for (count = 0; count < len32; count++)
 586                 atmel_sha_write(dd, SHA_REG_DIN(count), buffer[count]);
 587
 588         return -EINPROGRESS;
 589 }
 590
 591 static int atmel_sha_xmit_pdc(struct atmel_sha_dev *dd, dma_addr_t dma_addr1,
 592                 size_t length1, dma_addr_t dma_addr2, size_t length2, int final)
 593 {
 594         struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
 595         int len32;
 596
 597         dev_dbg(dd->dev, "xmit_pdc: digcnt: 0x%llx 0x%llx, length: %zd, final: %d\n",
 598                 ctx->digcnt[1], ctx->digcnt[0], length1, final);
 599
 600         len32 = DIV_ROUND_UP(length1, sizeof(u32));
 601         atmel_sha_write(dd, SHA_PTCR, SHA_PTCR_TXTDIS);
 602         atmel_sha_write(dd, SHA_TPR, dma_addr1);
 603         atmel_sha_write(dd, SHA_TCR, len32);
 604
 605         len32 = DIV_ROUND_UP(length2, sizeof(u32));
 606         atmel_sha_write(dd, SHA_TNPR, dma_addr2);
 607         atmel_sha_write(dd, SHA_TNCR, len32);
 608
 609         atmel_sha_write_ctrl(dd, 1);
 610
 611         /* should be non-zero before next lines to disable clocks later */
 612         ctx->digcnt[0] += length1;
 613         if (ctx->digcnt[0] < length1)
 614                 ctx->digcnt[1]++;
 615
 616         if (final)
 617                 dd->flags |= SHA_FLAGS_FINAL; /* catch last interrupt */
 618
 619         dd->flags |=  SHA_FLAGS_DMA_ACTIVE;
 620
 621         /* Start DMA transfer */
 622         atmel_sha_write(dd, SHA_PTCR, SHA_PTCR_TXTEN);
 623
 624         return -EINPROGRESS;
 625 }
 626
 627 static void atmel_sha_dma_callback(void *data)
 628 {
 629         struct atmel_sha_dev *dd = data;
 630
 631         dd->is_async = true;
 632
 633         /* dma_lch_in - completed - wait DATRDY */
 634         atmel_sha_write(dd, SHA_IER, SHA_INT_DATARDY);
 635 }
 636
 637 static int atmel_sha_xmit_dma(struct atmel_sha_dev *dd, dma_addr_t dma_addr1,
 638                 size_t length1, dma_addr_t dma_addr2, size_t length2, int final)
 639 {
 640         struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
 641         struct dma_async_tx_descriptor  *in_desc;
 642         struct scatterlist sg[2];
 643
 644         dev_dbg(dd->dev, "xmit_dma: digcnt: 0x%llx 0x%llx, length: %zd, final: %d\n",
 645                 ctx->digcnt[1], ctx->digcnt[0], length1, final);
 646
 647         dd->dma_lch_in.dma_conf.src_maxburst = 16;
 648         dd->dma_lch_in.dma_conf.dst_maxburst = 16;
 649
 650         dmaengine_slave_config(dd->dma_lch_in.chan, &dd->dma_lch_in.dma_conf);
 651
 652         if (length2) {
 653                 sg_init_table(sg, 2);
 654                 sg_dma_address(&sg[0]) = dma_addr1;
 655                 sg_dma_len(&sg[0]) = length1;
 656                 sg_dma_address(&sg[1]) = dma_addr2;
 657                 sg_dma_len(&sg[1]) = length2;
 658                 in_desc = dmaengine_prep_slave_sg(dd->dma_lch_in.chan, sg, 2,
 659                         DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 660         } else {
 661                 sg_init_table(sg, 1);
 662                 sg_dma_address(&sg[0]) = dma_addr1;
 663                 sg_dma_len(&sg[0]) = length1;
 664                 in_desc = dmaengine_prep_slave_sg(dd->dma_lch_in.chan, sg, 1,
 665                         DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 666         }
 667         if (!in_desc)
 668                 return atmel_sha_complete(dd, -EINVAL);
 669
 670         in_desc->callback = atmel_sha_dma_callback;
 671         in_desc->callback_param = dd;
 672
 673         atmel_sha_write_ctrl(dd, 1);
 674
 675         /* should be non-zero before next lines to disable clocks later */
 676         ctx->digcnt[0] += length1;
 677         if (ctx->digcnt[0] < length1)
 678                 ctx->digcnt[1]++;
 679
 680         if (final)
 681                 dd->flags |= SHA_FLAGS_FINAL; /* catch last interrupt */
 682
 683         dd->flags |=  SHA_FLAGS_DMA_ACTIVE;
 684
 685         /* Start DMA transfer */
 686         dmaengine_submit(in_desc);
 687         dma_async_issue_pending(dd->dma_lch_in.chan);
 688
 689         return -EINPROGRESS;
 690 }
 691
 692 static int atmel_sha_xmit_start(struct atmel_sha_dev *dd, dma_addr_t dma_addr1,
 693                 size_t length1, dma_addr_t dma_addr2, size_t length2, int final)
 694 {
 695         if (dd->caps.has_dma)
 696                 return atmel_sha_xmit_dma(dd, dma_addr1, length1,
 697                                 dma_addr2, length2, final);
 698         else
 699                 return atmel_sha_xmit_pdc(dd, dma_addr1, length1,
 700                                 dma_addr2, length2, final);
 701 }
 702
 703 static int atmel_sha_update_cpu(struct atmel_sha_dev *dd)
 704 {
 705         struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
 706         int bufcnt;
 707
 708         atmel_sha_append_sg(ctx);
 709         atmel_sha_fill_padding(ctx, 0);
 710         bufcnt = ctx->bufcnt;
 711         ctx->bufcnt = 0;
 712
 713         return atmel_sha_xmit_cpu(dd, ctx->buffer, bufcnt, 1);
 714 }
 715
 716 static int atmel_sha_xmit_dma_map(struct atmel_sha_dev *dd,
 717                                         struct atmel_sha_reqctx *ctx,
 718                                         size_t length, int final)
 719 {
 720         ctx->dma_addr = dma_map_single(dd->dev, ctx->buffer,
 721                                 ctx->buflen + ctx->block_size, DMA_TO_DEVICE);
 722         if (dma_mapping_error(dd->dev, ctx->dma_addr)) {
 723                 dev_err(dd->dev, "dma %zu bytes error\n", ctx->buflen +
 724                                 ctx->block_size);
 725                 return atmel_sha_complete(dd, -EINVAL);
 726         }
 727
 728         ctx->flags &= ~SHA_FLAGS_SG;
 729
 730         /* next call does not fail... so no unmap in the case of error */
 731         return atmel_sha_xmit_start(dd, ctx->dma_addr, length, 0, 0, final);
 732 }
 733
 734 static int atmel_sha_update_dma_slow(struct atmel_sha_dev *dd)
 735 {
 736         struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
 737         unsigned int final;
 738         size_t count;
 739
 740         atmel_sha_append_sg(ctx);
 741
 742         final = (ctx->flags & SHA_FLAGS_FINUP) && !ctx->total;
 743
 744         dev_dbg(dd->dev, "slow: bufcnt: %zu, digcnt: 0x%llx 0x%llx, final: %d\n",
 745                  ctx->bufcnt, ctx->digcnt[1], ctx->digcnt[0], final);
 746
 747         if (final)
 748                 atmel_sha_fill_padding(ctx, 0);
 749
 750         if (final || (ctx->bufcnt == ctx->buflen)) {
 751                 count = ctx->bufcnt;
 752                 ctx->bufcnt = 0;
 753                 return atmel_sha_xmit_dma_map(dd, ctx, count, final);
 754         }
 755
 756         return 0;
 757 }
 758
 759 static int atmel_sha_update_dma_start(struct atmel_sha_dev *dd)
 760 {
 761         struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
 762         unsigned int length, final, tail;
 763         struct scatterlist *sg;
 764         unsigned int count;
 765
 766         if (!ctx->total)
 767                 return 0;
 768
 769         if (ctx->bufcnt || ctx->offset)
 770                 return atmel_sha_update_dma_slow(dd);
 771
 772         dev_dbg(dd->dev, "fast: digcnt: 0x%llx 0x%llx, bufcnt: %zd, total: %u\n",
 773                 ctx->digcnt[1], ctx->digcnt[0], ctx->bufcnt, ctx->total);
 774
 775         sg = ctx->sg;
 776
 777         if (!IS_ALIGNED(sg->offset, sizeof(u32)))
 778                 return atmel_sha_update_dma_slow(dd);
 779
 780         if (!sg_is_last(sg) && !IS_ALIGNED(sg->length, ctx->block_size))
 781                 /* size is not ctx->block_size aligned */
 782                 return atmel_sha_update_dma_slow(dd);
 783
 784         length = min(ctx->total, sg->length);
 785
 786         if (sg_is_last(sg)) {
 787                 if (!(ctx->flags & SHA_FLAGS_FINUP)) {
 788                         /* not last sg must be ctx->block_size aligned */
 789                         tail = length & (ctx->block_size - 1);
 790                         length -= tail;
 791                 }
 792         }
 793
 794         ctx->total -= length;
 795         ctx->offset = length; /* offset where to start slow */
 796
 797         final = (ctx->flags & SHA_FLAGS_FINUP) && !ctx->total;
 798
 799         /* Add padding */
 800         if (final) {
 801                 tail = length & (ctx->block_size - 1);
 802                 length -= tail;
 803                 ctx->total += tail;
 804                 ctx->offset = length; /* offset where to start slow */
 805
 806                 sg = ctx->sg;
 807                 atmel_sha_append_sg(ctx);
 808
 809                 atmel_sha_fill_padding(ctx, length);
 810
 811                 ctx->dma_addr = dma_map_single(dd->dev, ctx->buffer,
 812                         ctx->buflen + ctx->block_size, DMA_TO_DEVICE);
 813                 if (dma_mapping_error(dd->dev, ctx->dma_addr)) {
 814                         dev_err(dd->dev, "dma %zu bytes error\n",
 815                                 ctx->buflen + ctx->block_size);
 816                         return atmel_sha_complete(dd, -EINVAL);
 817                 }
 818
 819                 if (length == 0) {
 820                         ctx->flags &= ~SHA_FLAGS_SG;
 821                         count = ctx->bufcnt;
 822                         ctx->bufcnt = 0;
 823                         return atmel_sha_xmit_start(dd, ctx->dma_addr, count, 0,
 824                                         0, final);
 825                 } else {
 826                         ctx->sg = sg;
 827                         if (!dma_map_sg(dd->dev, ctx->sg, 1,
 828                                 DMA_TO_DEVICE)) {
 829                                         dev_err(dd->dev, "dma_map_sg  error\n");
 830                                         return atmel_sha_complete(dd, -EINVAL);
 831                         }
 832
 833                         ctx->flags |= SHA_FLAGS_SG;
 834
 835                         count = ctx->bufcnt;
 836                         ctx->bufcnt = 0;
 837                         return atmel_sha_xmit_start(dd, sg_dma_address(ctx->sg),
 838                                         length, ctx->dma_addr, count, final);
 839                 }
 840         }
 841
 842         if (!dma_map_sg(dd->dev, ctx->sg, 1, DMA_TO_DEVICE)) {
 843                 dev_err(dd->dev, "dma_map_sg  error\n");
 844                 return atmel_sha_complete(dd, -EINVAL);
 845         }
 846
 847         ctx->flags |= SHA_FLAGS_SG;
 848
 849         /* next call does not fail... so no unmap in the case of error */
 850         return atmel_sha_xmit_start(dd, sg_dma_address(ctx->sg), length, 0,
 851                                                                 0, final);
 852 }
 853
 854 static void atmel_sha_update_dma_stop(struct atmel_sha_dev *dd)
 855 {
 856         struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
 857
 858         if (ctx->flags & SHA_FLAGS_SG) {
 859                 dma_unmap_sg(dd->dev, ctx->sg, 1, DMA_TO_DEVICE);
 860                 if (ctx->sg->length == ctx->offset) {
 861                         ctx->sg = sg_next(ctx->sg);
 862                         if (ctx->sg)
 863                                 ctx->offset = 0;
 864                 }
 865                 if (ctx->flags & SHA_FLAGS_PAD) {
 866                         dma_unmap_single(dd->dev, ctx->dma_addr,
 867                                 ctx->buflen + ctx->block_size, DMA_TO_DEVICE);
 868                 }
 869         } else {
 870                 dma_unmap_single(dd->dev, ctx->dma_addr, ctx->buflen +
 871                                                 ctx->block_size, DMA_TO_DEVICE);
 872         }
 873 }
 874
 875 static int atmel_sha_update_req(struct atmel_sha_dev *dd)
 876 {
 877         struct ahash_request *req = dd->req;
 878         struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
 879         int err;
 880
 881         dev_dbg(dd->dev, "update_req: total: %u, digcnt: 0x%llx 0x%llx\n",
 882                 ctx->total, ctx->digcnt[1], ctx->digcnt[0]);
 883
 884         if (ctx->flags & SHA_FLAGS_CPU)
 885                 err = atmel_sha_update_cpu(dd);
 886         else
 887                 err = atmel_sha_update_dma_start(dd);
 888
 889         /* wait for dma completion before can take more data */
 890         dev_dbg(dd->dev, "update: err: %d, digcnt: 0x%llx 0%llx\n",
 891                         err, ctx->digcnt[1], ctx->digcnt[0]);
 892
 893         return err;
 894 }
 895
 896 static int atmel_sha_final_req(struct atmel_sha_dev *dd)
 897 {
 898         struct ahash_request *req = dd->req;
 899         struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
 900         int err = 0;
 901         int count;
 902
 903         if (ctx->bufcnt >= ATMEL_SHA_DMA_THRESHOLD) {
 904                 atmel_sha_fill_padding(ctx, 0);
 905                 count = ctx->bufcnt;
 906                 ctx->bufcnt = 0;
 907                 err = atmel_sha_xmit_dma_map(dd, ctx, count, 1);
 908         }
 909         /* faster to handle last block with cpu */
 910         else {
 911                 atmel_sha_fill_padding(ctx, 0);
 912                 count = ctx->bufcnt;
 913                 ctx->bufcnt = 0;
 914                 err = atmel_sha_xmit_cpu(dd, ctx->buffer, count, 1);
 915         }
 916
 917         dev_dbg(dd->dev, "final_req: err: %d\n", err);
 918
 919         return err;
 920 }
 921
 922 static void atmel_sha_copy_hash(struct ahash_request *req)
 923 {
 924         struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
 925         u32 *hash = (u32 *)ctx->digest;
 926         unsigned int i, hashsize;
 927
 928         switch (ctx->flags & SHA_FLAGS_ALGO_MASK) {
 929         case SHA_FLAGS_SHA1:
 930                 hashsize = SHA1_DIGEST_SIZE;
 931                 break;
 932
 933         case SHA_FLAGS_SHA224:
 934         case SHA_FLAGS_SHA256:
 935                 hashsize = SHA256_DIGEST_SIZE;
 936                 break;
 937
 938         case SHA_FLAGS_SHA384:
 939         case SHA_FLAGS_SHA512:
 940                 hashsize = SHA512_DIGEST_SIZE;
 941                 break;
 942
 943         default:
 944                 /* Should not happen... */
 945                 return;
 946         }
 947
 948         for (i = 0; i < hashsize / sizeof(u32); ++i)
 949                 hash[i] = atmel_sha_read(ctx->dd, SHA_REG_DIGEST(i));
 950         ctx->flags |= SHA_FLAGS_RESTORE;
 951 }
 952
 953 static void atmel_sha_copy_ready_hash(struct ahash_request *req)
 954 {
 955         struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
 956
 957         if (!req->result)
 958                 return;
 959
 960         switch (ctx->flags & SHA_FLAGS_ALGO_MASK) {
 961         default:
 962         case SHA_FLAGS_SHA1:
 963                 memcpy(req->result, ctx->digest, SHA1_DIGEST_SIZE);
 964                 break;
 965
 966         case SHA_FLAGS_SHA224:
 967                 memcpy(req->result, ctx->digest, SHA224_DIGEST_SIZE);
 968                 break;
 969
 970         case SHA_FLAGS_SHA256:
 971                 memcpy(req->result, ctx->digest, SHA256_DIGEST_SIZE);
 972                 break;
 973
 974         case SHA_FLAGS_SHA384:
 975                 memcpy(req->result, ctx->digest, SHA384_DIGEST_SIZE);
 976                 break;
 977
 978         case SHA_FLAGS_SHA512:
 979                 memcpy(req->result, ctx->digest, SHA512_DIGEST_SIZE);
 980                 break;
 981         }
 982 }
 983
 984 static int atmel_sha_finish(struct ahash_request *req)
 985 {
 986         struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
 987         struct atmel_sha_dev *dd = ctx->dd;
 988
 989         if (ctx->digcnt[0] || ctx->digcnt[1])
 990                 atmel_sha_copy_ready_hash(req);
 991
 992         dev_dbg(dd->dev, "digcnt: 0x%llx 0x%llx, bufcnt: %zd\n", ctx->digcnt[1],
 993                 ctx->digcnt[0], ctx->bufcnt);
 994
 995         return 0;
 996 }
 997
 998 static void atmel_sha_finish_req(struct ahash_request *req, int err)
 999 {
1000         struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1001         struct atmel_sha_dev *dd = ctx->dd;
1002
1003         if (!err) {
1004                 atmel_sha_copy_hash(req);
1005                 if (SHA_FLAGS_FINAL & dd->flags)
1006                         err = atmel_sha_finish(req);
1007         } else {
1008                 ctx->flags |= SHA_FLAGS_ERROR;
1009         }
1010
1011         /* atomic operation is not needed here */
1012         (void)atmel_sha_complete(dd, err);
1013 }
1014
1015 static int atmel_sha_hw_init(struct atmel_sha_dev *dd)
1016 {
1017         int err;
1018
1019         err = clk_enable(dd->iclk);
1020         if (err)
1021                 return err;
1022
1023         if (!(SHA_FLAGS_INIT & dd->flags)) {
1024                 atmel_sha_write(dd, SHA_CR, SHA_CR_SWRST);
1025                 dd->flags |= SHA_FLAGS_INIT;
1026         }
1027
1028         return 0;
1029 }
1030
1031 static inline unsigned int atmel_sha_get_version(struct atmel_sha_dev *dd)
1032 {
1033         return atmel_sha_read(dd, SHA_HW_VERSION) & 0x00000fff;
1034 }
1035
1036 static int atmel_sha_hw_version_init(struct atmel_sha_dev *dd)
1037 {
1038         int err;
1039
1040         err = atmel_sha_hw_init(dd);
1041         if (err)
1042                 return err;
1043
1044         dd->hw_version = atmel_sha_get_version(dd);
1045
1046         dev_info(dd->dev,
1047                         "version: 0x%x\n", dd->hw_version);
1048
1049         clk_disable(dd->iclk);
1050
1051         return 0;
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: %u\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 void atmel_sha_alg_init(struct ahash_alg *alg)
1255 {
1256         alg->halg.base.cra_priority = ATMEL_SHA_PRIORITY;
1257         alg->halg.base.cra_flags = CRYPTO_ALG_ASYNC;
1258         alg->halg.base.cra_ctxsize = sizeof(struct atmel_sha_ctx);
1259         alg->halg.base.cra_module = THIS_MODULE;
1260         alg->halg.base.cra_init = atmel_sha_cra_init;
1261
1262         alg->halg.statesize = sizeof(struct atmel_sha_reqctx);
1263
1264         alg->init = atmel_sha_init;
1265         alg->update = atmel_sha_update;
1266         alg->final = atmel_sha_final;
1267         alg->finup = atmel_sha_finup;
1268         alg->digest = atmel_sha_digest;
1269         alg->export = atmel_sha_export;
1270         alg->import = atmel_sha_import;
1271 }
1272
1273 static struct ahash_alg sha_1_256_algs[] = {
1274 {
1275         .halg.base.cra_name             = "sha1",
1276         .halg.base.cra_driver_name      = "atmel-sha1",
1277         .halg.base.cra_blocksize        = SHA1_BLOCK_SIZE,
1278
1279         .halg.digestsize = SHA1_DIGEST_SIZE,
1280 },
1281 {
1282         .halg.base.cra_name             = "sha256",
1283         .halg.base.cra_driver_name      = "atmel-sha256",
1284         .halg.base.cra_blocksize        = SHA256_BLOCK_SIZE,
1285
1286         .halg.digestsize = SHA256_DIGEST_SIZE,
1287 },
1288 };
1289
1290 static struct ahash_alg sha_224_alg = {
1291         .halg.base.cra_name             = "sha224",
1292         .halg.base.cra_driver_name      = "atmel-sha224",
1293         .halg.base.cra_blocksize        = SHA224_BLOCK_SIZE,
1294
1295         .halg.digestsize = SHA224_DIGEST_SIZE,
1296 };
1297
1298 static struct ahash_alg sha_384_512_algs[] = {
1299 {
1300         .halg.base.cra_name             = "sha384",
1301         .halg.base.cra_driver_name      = "atmel-sha384",
1302         .halg.base.cra_blocksize        = SHA384_BLOCK_SIZE,
1303         .halg.base.cra_alignmask        = 0x3,
1304
1305         .halg.digestsize = SHA384_DIGEST_SIZE,
1306 },
1307 {
1308         .halg.base.cra_name             = "sha512",
1309         .halg.base.cra_driver_name      = "atmel-sha512",
1310         .halg.base.cra_blocksize        = SHA512_BLOCK_SIZE,
1311         .halg.base.cra_alignmask        = 0x3,
1312
1313         .halg.digestsize = SHA512_DIGEST_SIZE,
1314 },
1315 };
1316
1317 static void atmel_sha_queue_task(unsigned long data)
1318 {
1319         struct atmel_sha_dev *dd = (struct atmel_sha_dev *)data;
1320
1321         atmel_sha_handle_queue(dd, NULL);
1322 }
1323
1324 static int atmel_sha_done(struct atmel_sha_dev *dd)
1325 {
1326         int err = 0;
1327
1328         if (SHA_FLAGS_CPU & dd->flags) {
1329                 if (SHA_FLAGS_OUTPUT_READY & dd->flags) {
1330                         dd->flags &= ~SHA_FLAGS_OUTPUT_READY;
1331                         goto finish;
1332                 }
1333         } else if (SHA_FLAGS_DMA_READY & dd->flags) {
1334                 if (SHA_FLAGS_DMA_ACTIVE & dd->flags) {
1335                         dd->flags &= ~SHA_FLAGS_DMA_ACTIVE;
1336                         atmel_sha_update_dma_stop(dd);
1337                 }
1338                 if (SHA_FLAGS_OUTPUT_READY & dd->flags) {
1339                         /* hash or semi-hash ready */
1340                         dd->flags &= ~(SHA_FLAGS_DMA_READY |
1341                                                 SHA_FLAGS_OUTPUT_READY);
1342                         err = atmel_sha_update_dma_start(dd);
1343                         if (err != -EINPROGRESS)
1344                                 goto finish;
1345                 }
1346         }
1347         return err;
1348
1349 finish:
1350         /* finish curent request */
1351         atmel_sha_finish_req(dd->req, err);
1352
1353         return err;
1354 }
1355
1356 static void atmel_sha_done_task(unsigned long data)
1357 {
1358         struct atmel_sha_dev *dd = (struct atmel_sha_dev *)data;
1359
1360         dd->is_async = true;
1361         (void)dd->resume(dd);
1362 }
1363
1364 static irqreturn_t atmel_sha_irq(int irq, void *dev_id)
1365 {
1366         struct atmel_sha_dev *sha_dd = dev_id;
1367         u32 reg;
1368
1369         reg = atmel_sha_read(sha_dd, SHA_ISR);
1370         if (reg & atmel_sha_read(sha_dd, SHA_IMR)) {
1371                 atmel_sha_write(sha_dd, SHA_IDR, reg);
1372                 if (SHA_FLAGS_BUSY & sha_dd->flags) {
1373                         sha_dd->flags |= SHA_FLAGS_OUTPUT_READY;
1374                         if (!(SHA_FLAGS_CPU & sha_dd->flags))
1375                                 sha_dd->flags |= SHA_FLAGS_DMA_READY;
1376                         tasklet_schedule(&sha_dd->done_task);
1377                 } else {
1378                         dev_warn(sha_dd->dev, "SHA interrupt when no active requests.\n");
1379                 }
1380                 return IRQ_HANDLED;
1381         }
1382
1383         return IRQ_NONE;
1384 }
1385
1386
1387 /* DMA transfer functions */
1388
1389 static bool atmel_sha_dma_check_aligned(struct atmel_sha_dev *dd,
1390                                         struct scatterlist *sg,
1391                                         size_t len)
1392 {
1393         struct atmel_sha_dma *dma = &dd->dma_lch_in;
1394         struct ahash_request *req = dd->req;
1395         struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1396         size_t bs = ctx->block_size;
1397         int nents;
1398
1399         for (nents = 0; sg; sg = sg_next(sg), ++nents) {
1400                 if (!IS_ALIGNED(sg->offset, sizeof(u32)))
1401                         return false;
1402
1403                 /*
1404                  * This is the last sg, the only one that is allowed to
1405                  * have an unaligned length.
1406                  */
1407                 if (len <= sg->length) {
1408                         dma->nents = nents + 1;
1409                         dma->last_sg_length = sg->length;
1410                         sg->length = ALIGN(len, sizeof(u32));
1411                         return true;
1412                 }
1413
1414                 /* All other sg lengths MUST be aligned to the block size. */
1415                 if (!IS_ALIGNED(sg->length, bs))
1416                         return false;
1417
1418                 len -= sg->length;
1419         }
1420
1421         return false;
1422 }
1423
1424 static void atmel_sha_dma_callback2(void *data)
1425 {
1426         struct atmel_sha_dev *dd = data;
1427         struct atmel_sha_dma *dma = &dd->dma_lch_in;
1428         struct scatterlist *sg;
1429         int nents;
1430
1431         dma_unmap_sg(dd->dev, dma->sg, dma->nents, DMA_TO_DEVICE);
1432
1433         sg = dma->sg;
1434         for (nents = 0; nents < dma->nents - 1; ++nents)
1435                 sg = sg_next(sg);
1436         sg->length = dma->last_sg_length;
1437
1438         dd->is_async = true;
1439         (void)atmel_sha_wait_for_data_ready(dd, dd->resume);
1440 }
1441
1442 static int atmel_sha_dma_start(struct atmel_sha_dev *dd,
1443                                struct scatterlist *src,
1444                                size_t len,
1445                                atmel_sha_fn_t resume)
1446 {
1447         struct atmel_sha_dma *dma = &dd->dma_lch_in;
1448         struct dma_slave_config *config = &dma->dma_conf;
1449         struct dma_chan *chan = dma->chan;
1450         struct dma_async_tx_descriptor *desc;
1451         dma_cookie_t cookie;
1452         unsigned int sg_len;
1453         int err;
1454
1455         dd->resume = resume;
1456
1457         /*
1458          * dma->nents has already been initialized by
1459          * atmel_sha_dma_check_aligned().
1460          */
1461         dma->sg = src;
1462         sg_len = dma_map_sg(dd->dev, dma->sg, dma->nents, DMA_TO_DEVICE);
1463         if (!sg_len) {
1464                 err = -ENOMEM;
1465                 goto exit;
1466         }
1467
1468         config->src_maxburst = 16;
1469         config->dst_maxburst = 16;
1470         err = dmaengine_slave_config(chan, config);
1471         if (err)
1472                 goto unmap_sg;
1473
1474         desc = dmaengine_prep_slave_sg(chan, dma->sg, sg_len, DMA_MEM_TO_DEV,
1475                                        DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1476         if (!desc) {
1477                 err = -ENOMEM;
1478                 goto unmap_sg;
1479         }
1480
1481         desc->callback = atmel_sha_dma_callback2;
1482         desc->callback_param = dd;
1483         cookie = dmaengine_submit(desc);
1484         err = dma_submit_error(cookie);
1485         if (err)
1486                 goto unmap_sg;
1487
1488         dma_async_issue_pending(chan);
1489
1490         return -EINPROGRESS;
1491
1492 unmap_sg:
1493         dma_unmap_sg(dd->dev, dma->sg, dma->nents, DMA_TO_DEVICE);
1494 exit:
1495         return atmel_sha_complete(dd, err);
1496 }
1497
1498
1499 /* CPU transfer functions */
1500
1501 static int atmel_sha_cpu_transfer(struct atmel_sha_dev *dd)
1502 {
1503         struct ahash_request *req = dd->req;
1504         struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1505         const u32 *words = (const u32 *)ctx->buffer;
1506         size_t i, num_words;
1507         u32 isr, din, din_inc;
1508
1509         din_inc = (ctx->flags & SHA_FLAGS_IDATAR0) ? 0 : 1;
1510         for (;;) {
1511                 /* Write data into the Input Data Registers. */
1512                 num_words = DIV_ROUND_UP(ctx->bufcnt, sizeof(u32));
1513                 for (i = 0, din = 0; i < num_words; ++i, din += din_inc)
1514                         atmel_sha_write(dd, SHA_REG_DIN(din), words[i]);
1515
1516                 ctx->offset += ctx->bufcnt;
1517                 ctx->total -= ctx->bufcnt;
1518
1519                 if (!ctx->total)
1520                         break;
1521
1522                 /*
1523                  * Prepare next block:
1524                  * Fill ctx->buffer now with the next data to be written into
1525                  * IDATARx: it gives time for the SHA hardware to process
1526                  * the current data so the SHA_INT_DATARDY flag might be set
1527                  * in SHA_ISR when polling this register at the beginning of
1528                  * the next loop.
1529                  */
1530                 ctx->bufcnt = min_t(size_t, ctx->block_size, ctx->total);
1531                 scatterwalk_map_and_copy(ctx->buffer, ctx->sg,
1532                                          ctx->offset, ctx->bufcnt, 0);
1533
1534                 /* Wait for hardware to be ready again. */
1535                 isr = atmel_sha_read(dd, SHA_ISR);
1536                 if (!(isr & SHA_INT_DATARDY)) {
1537                         /* Not ready yet. */
1538                         dd->resume = atmel_sha_cpu_transfer;
1539                         atmel_sha_write(dd, SHA_IER, SHA_INT_DATARDY);
1540                         return -EINPROGRESS;
1541                 }
1542         }
1543
1544         if (unlikely(!(ctx->flags & SHA_FLAGS_WAIT_DATARDY)))
1545                 return dd->cpu_transfer_complete(dd);
1546
1547         return atmel_sha_wait_for_data_ready(dd, dd->cpu_transfer_complete);
1548 }
1549
1550 static int atmel_sha_cpu_start(struct atmel_sha_dev *dd,
1551                                struct scatterlist *sg,
1552                                unsigned int len,
1553                                bool idatar0_only,
1554                                bool wait_data_ready,
1555                                atmel_sha_fn_t resume)
1556 {
1557         struct ahash_request *req = dd->req;
1558         struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1559
1560         if (!len)
1561                 return resume(dd);
1562
1563         ctx->flags &= ~(SHA_FLAGS_IDATAR0 | SHA_FLAGS_WAIT_DATARDY);
1564
1565         if (idatar0_only)
1566                 ctx->flags |= SHA_FLAGS_IDATAR0;
1567
1568         if (wait_data_ready)
1569                 ctx->flags |= SHA_FLAGS_WAIT_DATARDY;
1570
1571         ctx->sg = sg;
1572         ctx->total = len;
1573         ctx->offset = 0;
1574
1575         /* Prepare the first block to be written. */
1576         ctx->bufcnt = min_t(size_t, ctx->block_size, ctx->total);
1577         scatterwalk_map_and_copy(ctx->buffer, ctx->sg,
1578                                  ctx->offset, ctx->bufcnt, 0);
1579
1580         dd->cpu_transfer_complete = resume;
1581         return atmel_sha_cpu_transfer(dd);
1582 }
1583
1584 static int atmel_sha_cpu_hash(struct atmel_sha_dev *dd,
1585                               const void *data, unsigned int datalen,
1586                               bool auto_padding,
1587                               atmel_sha_fn_t resume)
1588 {
1589         struct ahash_request *req = dd->req;
1590         struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1591         u32 msglen = (auto_padding) ? datalen : 0;
1592         u32 mr = SHA_MR_MODE_AUTO;
1593
1594         if (!(IS_ALIGNED(datalen, ctx->block_size) || auto_padding))
1595                 return atmel_sha_complete(dd, -EINVAL);
1596
1597         mr |= (ctx->flags & SHA_FLAGS_ALGO_MASK);
1598         atmel_sha_write(dd, SHA_MR, mr);
1599         atmel_sha_write(dd, SHA_MSR, msglen);
1600         atmel_sha_write(dd, SHA_BCR, msglen);
1601         atmel_sha_write(dd, SHA_CR, SHA_CR_FIRST);
1602
1603         sg_init_one(&dd->tmp, data, datalen);
1604         return atmel_sha_cpu_start(dd, &dd->tmp, datalen, false, true, resume);
1605 }
1606
1607
1608 /* hmac functions */
1609
1610 struct atmel_sha_hmac_key {
1611         bool                    valid;
1612         unsigned int            keylen;
1613         u8                      buffer[SHA512_BLOCK_SIZE];
1614         u8                      *keydup;
1615 };
1616
1617 static inline void atmel_sha_hmac_key_init(struct atmel_sha_hmac_key *hkey)
1618 {
1619         memset(hkey, 0, sizeof(*hkey));
1620 }
1621
1622 static inline void atmel_sha_hmac_key_release(struct atmel_sha_hmac_key *hkey)
1623 {
1624         kfree(hkey->keydup);
1625         memset(hkey, 0, sizeof(*hkey));
1626 }
1627
1628 static inline int atmel_sha_hmac_key_set(struct atmel_sha_hmac_key *hkey,
1629                                          const u8 *key,
1630                                          unsigned int keylen)
1631 {
1632         atmel_sha_hmac_key_release(hkey);
1633
1634         if (keylen > sizeof(hkey->buffer)) {
1635                 hkey->keydup = kmemdup(key, keylen, GFP_KERNEL);
1636                 if (!hkey->keydup)
1637                         return -ENOMEM;
1638
1639         } else {
1640                 memcpy(hkey->buffer, key, keylen);
1641         }
1642
1643         hkey->valid = true;
1644         hkey->keylen = keylen;
1645         return 0;
1646 }
1647
1648 static inline bool atmel_sha_hmac_key_get(const struct atmel_sha_hmac_key *hkey,
1649                                           const u8 **key,
1650                                           unsigned int *keylen)
1651 {
1652         if (!hkey->valid)
1653                 return false;
1654
1655         *keylen = hkey->keylen;
1656         *key = (hkey->keydup) ? hkey->keydup : hkey->buffer;
1657         return true;
1658 }
1659
1660
1661 struct atmel_sha_hmac_ctx {
1662         struct atmel_sha_ctx    base;
1663
1664         struct atmel_sha_hmac_key       hkey;
1665         u32                     ipad[SHA512_BLOCK_SIZE / sizeof(u32)];
1666         u32                     opad[SHA512_BLOCK_SIZE / sizeof(u32)];
1667         atmel_sha_fn_t          resume;
1668 };
1669
1670 static int atmel_sha_hmac_setup(struct atmel_sha_dev *dd,
1671                                 atmel_sha_fn_t resume);
1672 static int atmel_sha_hmac_prehash_key(struct atmel_sha_dev *dd,
1673                                       const u8 *key, unsigned int keylen);
1674 static int atmel_sha_hmac_prehash_key_done(struct atmel_sha_dev *dd);
1675 static int atmel_sha_hmac_compute_ipad_hash(struct atmel_sha_dev *dd);
1676 static int atmel_sha_hmac_compute_opad_hash(struct atmel_sha_dev *dd);
1677 static int atmel_sha_hmac_setup_done(struct atmel_sha_dev *dd);
1678
1679 static int atmel_sha_hmac_init_done(struct atmel_sha_dev *dd);
1680 static int atmel_sha_hmac_final(struct atmel_sha_dev *dd);
1681 static int atmel_sha_hmac_final_done(struct atmel_sha_dev *dd);
1682 static int atmel_sha_hmac_digest2(struct atmel_sha_dev *dd);
1683
1684 static int atmel_sha_hmac_setup(struct atmel_sha_dev *dd,
1685                                 atmel_sha_fn_t resume)
1686 {
1687         struct ahash_request *req = dd->req;
1688         struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1689         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
1690         struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
1691         unsigned int keylen;
1692         const u8 *key;
1693         size_t bs;
1694
1695         hmac->resume = resume;
1696         switch (ctx->flags & SHA_FLAGS_ALGO_MASK) {
1697         case SHA_FLAGS_SHA1:
1698                 ctx->block_size = SHA1_BLOCK_SIZE;
1699                 ctx->hash_size = SHA1_DIGEST_SIZE;
1700                 break;
1701
1702         case SHA_FLAGS_SHA224:
1703                 ctx->block_size = SHA224_BLOCK_SIZE;
1704                 ctx->hash_size = SHA256_DIGEST_SIZE;
1705                 break;
1706
1707         case SHA_FLAGS_SHA256:
1708                 ctx->block_size = SHA256_BLOCK_SIZE;
1709                 ctx->hash_size = SHA256_DIGEST_SIZE;
1710                 break;
1711
1712         case SHA_FLAGS_SHA384:
1713                 ctx->block_size = SHA384_BLOCK_SIZE;
1714                 ctx->hash_size = SHA512_DIGEST_SIZE;
1715                 break;
1716
1717         case SHA_FLAGS_SHA512:
1718                 ctx->block_size = SHA512_BLOCK_SIZE;
1719                 ctx->hash_size = SHA512_DIGEST_SIZE;
1720                 break;
1721
1722         default:
1723                 return atmel_sha_complete(dd, -EINVAL);
1724         }
1725         bs = ctx->block_size;
1726
1727         if (likely(!atmel_sha_hmac_key_get(&hmac->hkey, &key, &keylen)))
1728                 return resume(dd);
1729
1730         /* Compute K' from K. */
1731         if (unlikely(keylen > bs))
1732                 return atmel_sha_hmac_prehash_key(dd, key, keylen);
1733
1734         /* Prepare ipad. */
1735         memcpy((u8 *)hmac->ipad, key, keylen);
1736         memset((u8 *)hmac->ipad + keylen, 0, bs - keylen);
1737         return atmel_sha_hmac_compute_ipad_hash(dd);
1738 }
1739
1740 static int atmel_sha_hmac_prehash_key(struct atmel_sha_dev *dd,
1741                                       const u8 *key, unsigned int keylen)
1742 {
1743         return atmel_sha_cpu_hash(dd, key, keylen, true,
1744                                   atmel_sha_hmac_prehash_key_done);
1745 }
1746
1747 static int atmel_sha_hmac_prehash_key_done(struct atmel_sha_dev *dd)
1748 {
1749         struct ahash_request *req = dd->req;
1750         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
1751         struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
1752         struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1753         size_t ds = crypto_ahash_digestsize(tfm);
1754         size_t bs = ctx->block_size;
1755         size_t i, num_words = ds / sizeof(u32);
1756
1757         /* Prepare ipad. */
1758         for (i = 0; i < num_words; ++i)
1759                 hmac->ipad[i] = atmel_sha_read(dd, SHA_REG_DIGEST(i));
1760         memset((u8 *)hmac->ipad + ds, 0, bs - ds);
1761         return atmel_sha_hmac_compute_ipad_hash(dd);
1762 }
1763
1764 static int atmel_sha_hmac_compute_ipad_hash(struct atmel_sha_dev *dd)
1765 {
1766         struct ahash_request *req = dd->req;
1767         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
1768         struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
1769         struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1770         size_t bs = ctx->block_size;
1771         size_t i, num_words = bs / sizeof(u32);
1772
1773         memcpy(hmac->opad, hmac->ipad, bs);
1774         for (i = 0; i < num_words; ++i) {
1775                 hmac->ipad[i] ^= 0x36363636;
1776                 hmac->opad[i] ^= 0x5c5c5c5c;
1777         }
1778
1779         return atmel_sha_cpu_hash(dd, hmac->ipad, bs, false,
1780                                   atmel_sha_hmac_compute_opad_hash);
1781 }
1782
1783 static int atmel_sha_hmac_compute_opad_hash(struct atmel_sha_dev *dd)
1784 {
1785         struct ahash_request *req = dd->req;
1786         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
1787         struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
1788         struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1789         size_t bs = ctx->block_size;
1790         size_t hs = ctx->hash_size;
1791         size_t i, num_words = hs / sizeof(u32);
1792
1793         for (i = 0; i < num_words; ++i)
1794                 hmac->ipad[i] = atmel_sha_read(dd, SHA_REG_DIGEST(i));
1795         return atmel_sha_cpu_hash(dd, hmac->opad, bs, false,
1796                                   atmel_sha_hmac_setup_done);
1797 }
1798
1799 static int atmel_sha_hmac_setup_done(struct atmel_sha_dev *dd)
1800 {
1801         struct ahash_request *req = dd->req;
1802         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
1803         struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
1804         struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1805         size_t hs = ctx->hash_size;
1806         size_t i, num_words = hs / sizeof(u32);
1807
1808         for (i = 0; i < num_words; ++i)
1809                 hmac->opad[i] = atmel_sha_read(dd, SHA_REG_DIGEST(i));
1810         atmel_sha_hmac_key_release(&hmac->hkey);
1811         return hmac->resume(dd);
1812 }
1813
1814 static int atmel_sha_hmac_start(struct atmel_sha_dev *dd)
1815 {
1816         struct ahash_request *req = dd->req;
1817         struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1818         int err;
1819
1820         err = atmel_sha_hw_init(dd);
1821         if (err)
1822                 return atmel_sha_complete(dd, err);
1823
1824         switch (ctx->op) {
1825         case SHA_OP_INIT:
1826                 err = atmel_sha_hmac_setup(dd, atmel_sha_hmac_init_done);
1827                 break;
1828
1829         case SHA_OP_UPDATE:
1830                 dd->resume = atmel_sha_done;
1831                 err = atmel_sha_update_req(dd);
1832                 break;
1833
1834         case SHA_OP_FINAL:
1835                 dd->resume = atmel_sha_hmac_final;
1836                 err = atmel_sha_final_req(dd);
1837                 break;
1838
1839         case SHA_OP_DIGEST:
1840                 err = atmel_sha_hmac_setup(dd, atmel_sha_hmac_digest2);
1841                 break;
1842
1843         default:
1844                 return atmel_sha_complete(dd, -EINVAL);
1845         }
1846
1847         return err;
1848 }
1849
1850 static int atmel_sha_hmac_setkey(struct crypto_ahash *tfm, const u8 *key,
1851                                  unsigned int keylen)
1852 {
1853         struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
1854
1855         return atmel_sha_hmac_key_set(&hmac->hkey, key, keylen);
1856 }
1857
1858 static int atmel_sha_hmac_init(struct ahash_request *req)
1859 {
1860         int err;
1861
1862         err = atmel_sha_init(req);
1863         if (err)
1864                 return err;
1865
1866         return atmel_sha_enqueue(req, SHA_OP_INIT);
1867 }
1868
1869 static int atmel_sha_hmac_init_done(struct atmel_sha_dev *dd)
1870 {
1871         struct ahash_request *req = dd->req;
1872         struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1873         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
1874         struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
1875         size_t bs = ctx->block_size;
1876         size_t hs = ctx->hash_size;
1877
1878         ctx->bufcnt = 0;
1879         ctx->digcnt[0] = bs;
1880         ctx->digcnt[1] = 0;
1881         ctx->flags |= SHA_FLAGS_RESTORE;
1882         memcpy(ctx->digest, hmac->ipad, hs);
1883         return atmel_sha_complete(dd, 0);
1884 }
1885
1886 static int atmel_sha_hmac_final(struct atmel_sha_dev *dd)
1887 {
1888         struct ahash_request *req = dd->req;
1889         struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1890         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
1891         struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
1892         u32 *digest = (u32 *)ctx->digest;
1893         size_t ds = crypto_ahash_digestsize(tfm);
1894         size_t bs = ctx->block_size;
1895         size_t hs = ctx->hash_size;
1896         size_t i, num_words;
1897         u32 mr;
1898
1899         /* Save d = SHA((K' + ipad) | msg). */
1900         num_words = ds / sizeof(u32);
1901         for (i = 0; i < num_words; ++i)
1902                 digest[i] = atmel_sha_read(dd, SHA_REG_DIGEST(i));
1903
1904         /* Restore context to finish computing SHA((K' + opad) | d). */
1905         atmel_sha_write(dd, SHA_CR, SHA_CR_WUIHV);
1906         num_words = hs / sizeof(u32);
1907         for (i = 0; i < num_words; ++i)
1908                 atmel_sha_write(dd, SHA_REG_DIN(i), hmac->opad[i]);
1909
1910         mr = SHA_MR_MODE_AUTO | SHA_MR_UIHV;
1911         mr |= (ctx->flags & SHA_FLAGS_ALGO_MASK);
1912         atmel_sha_write(dd, SHA_MR, mr);
1913         atmel_sha_write(dd, SHA_MSR, bs + ds);
1914         atmel_sha_write(dd, SHA_BCR, ds);
1915         atmel_sha_write(dd, SHA_CR, SHA_CR_FIRST);
1916
1917         sg_init_one(&dd->tmp, digest, ds);
1918         return atmel_sha_cpu_start(dd, &dd->tmp, ds, false, true,
1919                                    atmel_sha_hmac_final_done);
1920 }
1921
1922 static int atmel_sha_hmac_final_done(struct atmel_sha_dev *dd)
1923 {
1924         /*
1925          * req->result might not be sizeof(u32) aligned, so copy the
1926          * digest into ctx->digest[] before memcpy() the data into
1927          * req->result.
1928          */
1929         atmel_sha_copy_hash(dd->req);
1930         atmel_sha_copy_ready_hash(dd->req);
1931         return atmel_sha_complete(dd, 0);
1932 }
1933
1934 static int atmel_sha_hmac_digest(struct ahash_request *req)
1935 {
1936         int err;
1937
1938         err = atmel_sha_init(req);
1939         if (err)
1940                 return err;
1941
1942         return atmel_sha_enqueue(req, SHA_OP_DIGEST);
1943 }
1944
1945 static int atmel_sha_hmac_digest2(struct atmel_sha_dev *dd)
1946 {
1947         struct ahash_request *req = dd->req;
1948         struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1949         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
1950         struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
1951         size_t hs = ctx->hash_size;
1952         size_t i, num_words = hs / sizeof(u32);
1953         bool use_dma = false;
1954         u32 mr;
1955
1956         /* Special case for empty message. */
1957         if (!req->nbytes)
1958                 return atmel_sha_complete(dd, -EINVAL); // TODO:
1959
1960         /* Check DMA threshold and alignment. */
1961         if (req->nbytes > ATMEL_SHA_DMA_THRESHOLD &&
1962             atmel_sha_dma_check_aligned(dd, req->src, req->nbytes))
1963                 use_dma = true;
1964
1965         /* Write both initial hash values to compute a HMAC. */
1966         atmel_sha_write(dd, SHA_CR, SHA_CR_WUIHV);
1967         for (i = 0; i < num_words; ++i)
1968                 atmel_sha_write(dd, SHA_REG_DIN(i), hmac->ipad[i]);
1969
1970         atmel_sha_write(dd, SHA_CR, SHA_CR_WUIEHV);
1971         for (i = 0; i < num_words; ++i)
1972                 atmel_sha_write(dd, SHA_REG_DIN(i), hmac->opad[i]);
1973
1974         /* Write the Mode, Message Size, Bytes Count then Control Registers. */
1975         mr = (SHA_MR_HMAC | SHA_MR_DUALBUFF);
1976         mr |= ctx->flags & SHA_FLAGS_ALGO_MASK;
1977         if (use_dma)
1978                 mr |= SHA_MR_MODE_IDATAR0;
1979         else
1980                 mr |= SHA_MR_MODE_AUTO;
1981         atmel_sha_write(dd, SHA_MR, mr);
1982
1983         atmel_sha_write(dd, SHA_MSR, req->nbytes);
1984         atmel_sha_write(dd, SHA_BCR, req->nbytes);
1985
1986         atmel_sha_write(dd, SHA_CR, SHA_CR_FIRST);
1987
1988         /* Process data. */
1989         if (use_dma)
1990                 return atmel_sha_dma_start(dd, req->src, req->nbytes,
1991                                            atmel_sha_hmac_final_done);
1992
1993         return atmel_sha_cpu_start(dd, req->src, req->nbytes, false, true,
1994                                    atmel_sha_hmac_final_done);
1995 }
1996
1997 static int atmel_sha_hmac_cra_init(struct crypto_tfm *tfm)
1998 {
1999         struct atmel_sha_hmac_ctx *hmac = crypto_tfm_ctx(tfm);
2000
2001         crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
2002                                  sizeof(struct atmel_sha_reqctx));
2003         hmac->base.start = atmel_sha_hmac_start;
2004         atmel_sha_hmac_key_init(&hmac->hkey);
2005
2006         return 0;
2007 }
2008
2009 static void atmel_sha_hmac_cra_exit(struct crypto_tfm *tfm)
2010 {
2011         struct atmel_sha_hmac_ctx *hmac = crypto_tfm_ctx(tfm);
2012
2013         atmel_sha_hmac_key_release(&hmac->hkey);
2014 }
2015
2016 static void atmel_sha_hmac_alg_init(struct ahash_alg *alg)
2017 {
2018         alg->halg.base.cra_priority = ATMEL_SHA_PRIORITY;
2019         alg->halg.base.cra_flags = CRYPTO_ALG_ASYNC;
2020         alg->halg.base.cra_ctxsize = sizeof(struct atmel_sha_hmac_ctx);
2021         alg->halg.base.cra_module = THIS_MODULE;
2022         alg->halg.base.cra_init = atmel_sha_hmac_cra_init;
2023         alg->halg.base.cra_exit = atmel_sha_hmac_cra_exit;
2024
2025         alg->halg.statesize = sizeof(struct atmel_sha_reqctx);
2026
2027         alg->init = atmel_sha_hmac_init;
2028         alg->update = atmel_sha_update;
2029         alg->final = atmel_sha_final;
2030         alg->digest = atmel_sha_hmac_digest;
2031         alg->setkey = atmel_sha_hmac_setkey;
2032         alg->export = atmel_sha_export;
2033         alg->import = atmel_sha_import;
2034 }
2035
2036 static struct ahash_alg sha_hmac_algs[] = {
2037 {
2038         .halg.base.cra_name             = "hmac(sha1)",
2039         .halg.base.cra_driver_name      = "atmel-hmac-sha1",
2040         .halg.base.cra_blocksize        = SHA1_BLOCK_SIZE,
2041
2042         .halg.digestsize = SHA1_DIGEST_SIZE,
2043 },
2044 {
2045         .halg.base.cra_name             = "hmac(sha224)",
2046         .halg.base.cra_driver_name      = "atmel-hmac-sha224",
2047         .halg.base.cra_blocksize        = SHA224_BLOCK_SIZE,
2048
2049         .halg.digestsize = SHA224_DIGEST_SIZE,
2050 },
2051 {
2052         .halg.base.cra_name             = "hmac(sha256)",
2053         .halg.base.cra_driver_name      = "atmel-hmac-sha256",
2054         .halg.base.cra_blocksize        = SHA256_BLOCK_SIZE,
2055
2056         .halg.digestsize = SHA256_DIGEST_SIZE,
2057 },
2058 {
2059         .halg.base.cra_name             = "hmac(sha384)",
2060         .halg.base.cra_driver_name      = "atmel-hmac-sha384",
2061         .halg.base.cra_blocksize        = SHA384_BLOCK_SIZE,
2062
2063         .halg.digestsize = SHA384_DIGEST_SIZE,
2064 },
2065 {
2066         .halg.base.cra_name             = "hmac(sha512)",
2067         .halg.base.cra_driver_name      = "atmel-hmac-sha512",
2068         .halg.base.cra_blocksize        = SHA512_BLOCK_SIZE,
2069
2070         .halg.digestsize = SHA512_DIGEST_SIZE,
2071 },
2072 };
2073
2074 #if IS_ENABLED(CONFIG_CRYPTO_DEV_ATMEL_AUTHENC)
2075 /* authenc functions */
2076
2077 static int atmel_sha_authenc_init2(struct atmel_sha_dev *dd);
2078 static int atmel_sha_authenc_init_done(struct atmel_sha_dev *dd);
2079 static int atmel_sha_authenc_final_done(struct atmel_sha_dev *dd);
2080
2081
2082 struct atmel_sha_authenc_ctx {
2083         struct crypto_ahash     *tfm;
2084 };
2085
2086 struct atmel_sha_authenc_reqctx {
2087         struct atmel_sha_reqctx base;
2088
2089         atmel_aes_authenc_fn_t  cb;
2090         struct atmel_aes_dev    *aes_dev;
2091
2092         /* _init() parameters. */
2093         struct scatterlist      *assoc;
2094         u32                     assoclen;
2095         u32                     textlen;
2096
2097         /* _final() parameters. */
2098         u32                     *digest;
2099         unsigned int            digestlen;
2100 };
2101
2102 static void atmel_sha_authenc_complete(struct crypto_async_request *areq,
2103                                        int err)
2104 {
2105         struct ahash_request *req = areq->data;
2106         struct atmel_sha_authenc_reqctx *authctx  = ahash_request_ctx(req);
2107
2108         authctx->cb(authctx->aes_dev, err, authctx->base.dd->is_async);
2109 }
2110
2111 static int atmel_sha_authenc_start(struct atmel_sha_dev *dd)
2112 {
2113         struct ahash_request *req = dd->req;
2114         struct atmel_sha_authenc_reqctx *authctx = ahash_request_ctx(req);
2115         int err;
2116
2117         /*
2118          * Force atmel_sha_complete() to call req->base.complete(), ie
2119          * atmel_sha_authenc_complete(), which in turn calls authctx->cb().
2120          */
2121         dd->force_complete = true;
2122
2123         err = atmel_sha_hw_init(dd);
2124         return authctx->cb(authctx->aes_dev, err, dd->is_async);
2125 }
2126
2127 bool atmel_sha_authenc_is_ready(void)
2128 {
2129         struct atmel_sha_ctx dummy;
2130
2131         dummy.dd = NULL;
2132         return (atmel_sha_find_dev(&dummy) != NULL);
2133 }
2134 EXPORT_SYMBOL_GPL(atmel_sha_authenc_is_ready);
2135
2136 unsigned int atmel_sha_authenc_get_reqsize(void)
2137 {
2138         return sizeof(struct atmel_sha_authenc_reqctx);
2139 }
2140 EXPORT_SYMBOL_GPL(atmel_sha_authenc_get_reqsize);
2141
2142 struct atmel_sha_authenc_ctx *atmel_sha_authenc_spawn(unsigned long mode)
2143 {
2144         struct atmel_sha_authenc_ctx *auth;
2145         struct crypto_ahash *tfm;
2146         struct atmel_sha_ctx *tctx;
2147         const char *name;
2148         int err = -EINVAL;
2149
2150         switch (mode & SHA_FLAGS_MODE_MASK) {
2151         case SHA_FLAGS_HMAC_SHA1:
2152                 name = "atmel-hmac-sha1";
2153                 break;
2154
2155         case SHA_FLAGS_HMAC_SHA224:
2156                 name = "atmel-hmac-sha224";
2157                 break;
2158
2159         case SHA_FLAGS_HMAC_SHA256:
2160                 name = "atmel-hmac-sha256";
2161                 break;
2162
2163         case SHA_FLAGS_HMAC_SHA384:
2164                 name = "atmel-hmac-sha384";
2165                 break;
2166
2167         case SHA_FLAGS_HMAC_SHA512:
2168                 name = "atmel-hmac-sha512";
2169                 break;
2170
2171         default:
2172                 goto error;
2173         }
2174
2175         tfm = crypto_alloc_ahash(name, 0, 0);
2176         if (IS_ERR(tfm)) {
2177                 err = PTR_ERR(tfm);
2178                 goto error;
2179         }
2180         tctx = crypto_ahash_ctx(tfm);
2181         tctx->start = atmel_sha_authenc_start;
2182         tctx->flags = mode;
2183
2184         auth = kzalloc(sizeof(*auth), GFP_KERNEL);
2185         if (!auth) {
2186                 err = -ENOMEM;
2187                 goto err_free_ahash;
2188         }
2189         auth->tfm = tfm;
2190
2191         return auth;
2192
2193 err_free_ahash:
2194         crypto_free_ahash(tfm);
2195 error:
2196         return ERR_PTR(err);
2197 }
2198 EXPORT_SYMBOL_GPL(atmel_sha_authenc_spawn);
2199
2200 void atmel_sha_authenc_free(struct atmel_sha_authenc_ctx *auth)
2201 {
2202         if (auth)
2203                 crypto_free_ahash(auth->tfm);
2204         kfree(auth);
2205 }
2206 EXPORT_SYMBOL_GPL(atmel_sha_authenc_free);
2207
2208 int atmel_sha_authenc_setkey(struct atmel_sha_authenc_ctx *auth,
2209                              const u8 *key, unsigned int keylen, u32 flags)
2210 {
2211         struct crypto_ahash *tfm = auth->tfm;
2212
2213         crypto_ahash_clear_flags(tfm, CRYPTO_TFM_REQ_MASK);
2214         crypto_ahash_set_flags(tfm, flags & CRYPTO_TFM_REQ_MASK);
2215         return crypto_ahash_setkey(tfm, key, keylen);
2216 }
2217 EXPORT_SYMBOL_GPL(atmel_sha_authenc_setkey);
2218
2219 int atmel_sha_authenc_schedule(struct ahash_request *req,
2220                                struct atmel_sha_authenc_ctx *auth,
2221                                atmel_aes_authenc_fn_t cb,
2222                                struct atmel_aes_dev *aes_dev)
2223 {
2224         struct atmel_sha_authenc_reqctx *authctx = ahash_request_ctx(req);
2225         struct atmel_sha_reqctx *ctx = &authctx->base;
2226         struct crypto_ahash *tfm = auth->tfm;
2227         struct atmel_sha_ctx *tctx = crypto_ahash_ctx(tfm);
2228         struct atmel_sha_dev *dd;
2229
2230         /* Reset request context (MUST be done first). */
2231         memset(authctx, 0, sizeof(*authctx));
2232
2233         /* Get SHA device. */
2234         dd = atmel_sha_find_dev(tctx);
2235         if (!dd)
2236                 return cb(aes_dev, -ENODEV, false);
2237
2238         /* Init request context. */
2239         ctx->dd = dd;
2240         ctx->buflen = SHA_BUFFER_LEN;
2241         authctx->cb = cb;
2242         authctx->aes_dev = aes_dev;
2243         ahash_request_set_tfm(req, tfm);
2244         ahash_request_set_callback(req, 0, atmel_sha_authenc_complete, req);
2245
2246         return atmel_sha_handle_queue(dd, req);
2247 }
2248 EXPORT_SYMBOL_GPL(atmel_sha_authenc_schedule);
2249
2250 int atmel_sha_authenc_init(struct ahash_request *req,
2251                            struct scatterlist *assoc, unsigned int assoclen,
2252                            unsigned int textlen,
2253                            atmel_aes_authenc_fn_t cb,
2254                            struct atmel_aes_dev *aes_dev)
2255 {
2256         struct atmel_sha_authenc_reqctx *authctx = ahash_request_ctx(req);
2257         struct atmel_sha_reqctx *ctx = &authctx->base;
2258         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
2259         struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
2260         struct atmel_sha_dev *dd = ctx->dd;
2261
2262         if (unlikely(!IS_ALIGNED(assoclen, sizeof(u32))))
2263                 return atmel_sha_complete(dd, -EINVAL);
2264
2265         authctx->cb = cb;
2266         authctx->aes_dev = aes_dev;
2267         authctx->assoc = assoc;
2268         authctx->assoclen = assoclen;
2269         authctx->textlen = textlen;
2270
2271         ctx->flags = hmac->base.flags;
2272         return atmel_sha_hmac_setup(dd, atmel_sha_authenc_init2);
2273 }
2274 EXPORT_SYMBOL_GPL(atmel_sha_authenc_init);
2275
2276 static int atmel_sha_authenc_init2(struct atmel_sha_dev *dd)
2277 {
2278         struct ahash_request *req = dd->req;
2279         struct atmel_sha_authenc_reqctx *authctx = ahash_request_ctx(req);
2280         struct atmel_sha_reqctx *ctx = &authctx->base;
2281         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
2282         struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
2283         size_t hs = ctx->hash_size;
2284         size_t i, num_words = hs / sizeof(u32);
2285         u32 mr, msg_size;
2286
2287         atmel_sha_write(dd, SHA_CR, SHA_CR_WUIHV);
2288         for (i = 0; i < num_words; ++i)
2289                 atmel_sha_write(dd, SHA_REG_DIN(i), hmac->ipad[i]);
2290
2291         atmel_sha_write(dd, SHA_CR, SHA_CR_WUIEHV);
2292         for (i = 0; i < num_words; ++i)
2293                 atmel_sha_write(dd, SHA_REG_DIN(i), hmac->opad[i]);
2294
2295         mr = (SHA_MR_MODE_IDATAR0 |
2296               SHA_MR_HMAC |
2297               SHA_MR_DUALBUFF);
2298         mr |= ctx->flags & SHA_FLAGS_ALGO_MASK;
2299         atmel_sha_write(dd, SHA_MR, mr);
2300
2301         msg_size = authctx->assoclen + authctx->textlen;
2302         atmel_sha_write(dd, SHA_MSR, msg_size);
2303         atmel_sha_write(dd, SHA_BCR, msg_size);
2304
2305         atmel_sha_write(dd, SHA_CR, SHA_CR_FIRST);
2306
2307         /* Process assoc data. */
2308         return atmel_sha_cpu_start(dd, authctx->assoc, authctx->assoclen,
2309                                    true, false,
2310                                    atmel_sha_authenc_init_done);
2311 }
2312
2313 static int atmel_sha_authenc_init_done(struct atmel_sha_dev *dd)
2314 {
2315         struct ahash_request *req = dd->req;
2316         struct atmel_sha_authenc_reqctx *authctx = ahash_request_ctx(req);
2317
2318         return authctx->cb(authctx->aes_dev, 0, dd->is_async);
2319 }
2320
2321 int atmel_sha_authenc_final(struct ahash_request *req,
2322                             u32 *digest, unsigned int digestlen,
2323                             atmel_aes_authenc_fn_t cb,
2324                             struct atmel_aes_dev *aes_dev)
2325 {
2326         struct atmel_sha_authenc_reqctx *authctx = ahash_request_ctx(req);
2327         struct atmel_sha_reqctx *ctx = &authctx->base;
2328         struct atmel_sha_dev *dd = ctx->dd;
2329
2330         switch (ctx->flags & SHA_FLAGS_ALGO_MASK) {
2331         case SHA_FLAGS_SHA1:
2332                 authctx->digestlen = SHA1_DIGEST_SIZE;
2333                 break;
2334
2335         case SHA_FLAGS_SHA224:
2336                 authctx->digestlen = SHA224_DIGEST_SIZE;
2337                 break;
2338
2339         case SHA_FLAGS_SHA256:
2340                 authctx->digestlen = SHA256_DIGEST_SIZE;
2341                 break;
2342
2343         case SHA_FLAGS_SHA384:
2344                 authctx->digestlen = SHA384_DIGEST_SIZE;
2345                 break;
2346
2347         case SHA_FLAGS_SHA512:
2348                 authctx->digestlen = SHA512_DIGEST_SIZE;
2349                 break;
2350
2351         default:
2352                 return atmel_sha_complete(dd, -EINVAL);
2353         }
2354         if (authctx->digestlen > digestlen)
2355                 authctx->digestlen = digestlen;
2356
2357         authctx->cb = cb;
2358         authctx->aes_dev = aes_dev;
2359         authctx->digest = digest;
2360         return atmel_sha_wait_for_data_ready(dd,
2361                                              atmel_sha_authenc_final_done);
2362 }
2363 EXPORT_SYMBOL_GPL(atmel_sha_authenc_final);
2364
2365 static int atmel_sha_authenc_final_done(struct atmel_sha_dev *dd)
2366 {
2367         struct ahash_request *req = dd->req;
2368         struct atmel_sha_authenc_reqctx *authctx = ahash_request_ctx(req);
2369         size_t i, num_words = authctx->digestlen / sizeof(u32);
2370
2371         for (i = 0; i < num_words; ++i)
2372                 authctx->digest[i] = atmel_sha_read(dd, SHA_REG_DIGEST(i));
2373
2374         return atmel_sha_complete(dd, 0);
2375 }
2376
2377 void atmel_sha_authenc_abort(struct ahash_request *req)
2378 {
2379         struct atmel_sha_authenc_reqctx *authctx = ahash_request_ctx(req);
2380         struct atmel_sha_reqctx *ctx = &authctx->base;
2381         struct atmel_sha_dev *dd = ctx->dd;
2382
2383         /* Prevent atmel_sha_complete() from calling req->base.complete(). */
2384         dd->is_async = false;
2385         dd->force_complete = false;
2386         (void)atmel_sha_complete(dd, 0);
2387 }
2388 EXPORT_SYMBOL_GPL(atmel_sha_authenc_abort);
2389
2390 #endif /* CONFIG_CRYPTO_DEV_ATMEL_AUTHENC */
2391
2392
2393 static void atmel_sha_unregister_algs(struct atmel_sha_dev *dd)
2394 {
2395         int i;
2396
2397         if (dd->caps.has_hmac)
2398                 for (i = 0; i < ARRAY_SIZE(sha_hmac_algs); i++)
2399                         crypto_unregister_ahash(&sha_hmac_algs[i]);
2400
2401         for (i = 0; i < ARRAY_SIZE(sha_1_256_algs); i++)
2402                 crypto_unregister_ahash(&sha_1_256_algs[i]);
2403
2404         if (dd->caps.has_sha224)
2405                 crypto_unregister_ahash(&sha_224_alg);
2406
2407         if (dd->caps.has_sha_384_512) {
2408                 for (i = 0; i < ARRAY_SIZE(sha_384_512_algs); i++)
2409                         crypto_unregister_ahash(&sha_384_512_algs[i]);
2410         }
2411 }
2412
2413 static int atmel_sha_register_algs(struct atmel_sha_dev *dd)
2414 {
2415         int err, i, j;
2416
2417         for (i = 0; i < ARRAY_SIZE(sha_1_256_algs); i++) {
2418                 atmel_sha_alg_init(&sha_1_256_algs[i]);
2419
2420                 err = crypto_register_ahash(&sha_1_256_algs[i]);
2421                 if (err)
2422                         goto err_sha_1_256_algs;
2423         }
2424
2425         if (dd->caps.has_sha224) {
2426                 atmel_sha_alg_init(&sha_224_alg);
2427
2428                 err = crypto_register_ahash(&sha_224_alg);
2429                 if (err)
2430                         goto err_sha_224_algs;
2431         }
2432
2433         if (dd->caps.has_sha_384_512) {
2434                 for (i = 0; i < ARRAY_SIZE(sha_384_512_algs); i++) {
2435                         atmel_sha_alg_init(&sha_384_512_algs[i]);
2436
2437                         err = crypto_register_ahash(&sha_384_512_algs[i]);
2438                         if (err)
2439                                 goto err_sha_384_512_algs;
2440                 }
2441         }
2442
2443         if (dd->caps.has_hmac) {
2444                 for (i = 0; i < ARRAY_SIZE(sha_hmac_algs); i++) {
2445                         atmel_sha_hmac_alg_init(&sha_hmac_algs[i]);
2446
2447                         err = crypto_register_ahash(&sha_hmac_algs[i]);
2448                         if (err)
2449                                 goto err_sha_hmac_algs;
2450                 }
2451         }
2452
2453         return 0;
2454
2455         /*i = ARRAY_SIZE(sha_hmac_algs);*/
2456 err_sha_hmac_algs:
2457         for (j = 0; j < i; j++)
2458                 crypto_unregister_ahash(&sha_hmac_algs[j]);
2459         i = ARRAY_SIZE(sha_384_512_algs);
2460 err_sha_384_512_algs:
2461         for (j = 0; j < i; j++)
2462                 crypto_unregister_ahash(&sha_384_512_algs[j]);
2463         crypto_unregister_ahash(&sha_224_alg);
2464 err_sha_224_algs:
2465         i = ARRAY_SIZE(sha_1_256_algs);
2466 err_sha_1_256_algs:
2467         for (j = 0; j < i; j++)
2468                 crypto_unregister_ahash(&sha_1_256_algs[j]);
2469
2470         return err;
2471 }
2472
2473 static int atmel_sha_dma_init(struct atmel_sha_dev *dd)
2474 {
2475         dd->dma_lch_in.chan = dma_request_chan(dd->dev, "tx");
2476         if (IS_ERR(dd->dma_lch_in.chan)) {
2477                 dev_err(dd->dev, "DMA channel is not available\n");
2478                 return PTR_ERR(dd->dma_lch_in.chan);
2479         }
2480
2481         dd->dma_lch_in.dma_conf.dst_addr = dd->phys_base +
2482                 SHA_REG_DIN(0);
2483         dd->dma_lch_in.dma_conf.src_maxburst = 1;
2484         dd->dma_lch_in.dma_conf.src_addr_width =
2485                 DMA_SLAVE_BUSWIDTH_4_BYTES;
2486         dd->dma_lch_in.dma_conf.dst_maxburst = 1;
2487         dd->dma_lch_in.dma_conf.dst_addr_width =
2488                 DMA_SLAVE_BUSWIDTH_4_BYTES;
2489         dd->dma_lch_in.dma_conf.device_fc = false;
2490
2491         return 0;
2492 }
2493
2494 static void atmel_sha_dma_cleanup(struct atmel_sha_dev *dd)
2495 {
2496         dma_release_channel(dd->dma_lch_in.chan);
2497 }
2498
2499 static void atmel_sha_get_cap(struct atmel_sha_dev *dd)
2500 {
2501
2502         dd->caps.has_dma = 0;
2503         dd->caps.has_dualbuff = 0;
2504         dd->caps.has_sha224 = 0;
2505         dd->caps.has_sha_384_512 = 0;
2506         dd->caps.has_uihv = 0;
2507         dd->caps.has_hmac = 0;
2508
2509         /* keep only major version number */
2510         switch (dd->hw_version & 0xff0) {
2511         case 0x510:
2512                 dd->caps.has_dma = 1;
2513                 dd->caps.has_dualbuff = 1;
2514                 dd->caps.has_sha224 = 1;
2515                 dd->caps.has_sha_384_512 = 1;
2516                 dd->caps.has_uihv = 1;
2517                 dd->caps.has_hmac = 1;
2518                 break;
2519         case 0x420:
2520                 dd->caps.has_dma = 1;
2521                 dd->caps.has_dualbuff = 1;
2522                 dd->caps.has_sha224 = 1;
2523                 dd->caps.has_sha_384_512 = 1;
2524                 dd->caps.has_uihv = 1;
2525                 break;
2526         case 0x410:
2527                 dd->caps.has_dma = 1;
2528                 dd->caps.has_dualbuff = 1;
2529                 dd->caps.has_sha224 = 1;
2530                 dd->caps.has_sha_384_512 = 1;
2531                 break;
2532         case 0x400:
2533                 dd->caps.has_dma = 1;
2534                 dd->caps.has_dualbuff = 1;
2535                 dd->caps.has_sha224 = 1;
2536                 break;
2537         case 0x320:
2538                 break;
2539         default:
2540                 dev_warn(dd->dev,
2541                                 "Unmanaged sha version, set minimum capabilities\n");
2542                 break;
2543         }
2544 }
2545
2546 #if defined(CONFIG_OF)
2547 static const struct of_device_id atmel_sha_dt_ids[] = {
2548         { .compatible = "atmel,at91sam9g46-sha" },
2549         { /* sentinel */ }
2550 };
2551
2552 MODULE_DEVICE_TABLE(of, atmel_sha_dt_ids);
2553 #endif
2554
2555 static int atmel_sha_probe(struct platform_device *pdev)
2556 {
2557         struct atmel_sha_dev *sha_dd;
2558         struct device *dev = &pdev->dev;
2559         struct resource *sha_res;
2560         int err;
2561
2562         sha_dd = devm_kzalloc(&pdev->dev, sizeof(*sha_dd), GFP_KERNEL);
2563         if (!sha_dd)
2564                 return -ENOMEM;
2565
2566         sha_dd->dev = dev;
2567
2568         platform_set_drvdata(pdev, sha_dd);
2569
2570         INIT_LIST_HEAD(&sha_dd->list);
2571         spin_lock_init(&sha_dd->lock);
2572
2573         tasklet_init(&sha_dd->done_task, atmel_sha_done_task,
2574                                         (unsigned long)sha_dd);
2575         tasklet_init(&sha_dd->queue_task, atmel_sha_queue_task,
2576                                         (unsigned long)sha_dd);
2577
2578         crypto_init_queue(&sha_dd->queue, ATMEL_SHA_QUEUE_LENGTH);
2579
2580         /* Get the base address */
2581         sha_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2582         if (!sha_res) {
2583                 dev_err(dev, "no MEM resource info\n");
2584                 err = -ENODEV;
2585                 goto err_tasklet_kill;
2586         }
2587         sha_dd->phys_base = sha_res->start;
2588
2589         /* Get the IRQ */
2590         sha_dd->irq = platform_get_irq(pdev,  0);
2591         if (sha_dd->irq < 0) {
2592                 err = sha_dd->irq;
2593                 goto err_tasklet_kill;
2594         }
2595
2596         err = devm_request_irq(&pdev->dev, sha_dd->irq, atmel_sha_irq,
2597                                IRQF_SHARED, "atmel-sha", sha_dd);
2598         if (err) {
2599                 dev_err(dev, "unable to request sha irq.\n");
2600                 goto err_tasklet_kill;
2601         }
2602
2603         /* Initializing the clock */
2604         sha_dd->iclk = devm_clk_get(&pdev->dev, "sha_clk");
2605         if (IS_ERR(sha_dd->iclk)) {
2606                 dev_err(dev, "clock initialization failed.\n");
2607                 err = PTR_ERR(sha_dd->iclk);
2608                 goto err_tasklet_kill;
2609         }
2610
2611         sha_dd->io_base = devm_ioremap_resource(&pdev->dev, sha_res);
2612         if (IS_ERR(sha_dd->io_base)) {
2613                 dev_err(dev, "can't ioremap\n");
2614                 err = PTR_ERR(sha_dd->io_base);
2615                 goto err_tasklet_kill;
2616         }
2617
2618         err = clk_prepare(sha_dd->iclk);
2619         if (err)
2620                 goto err_tasklet_kill;
2621
2622         err = atmel_sha_hw_version_init(sha_dd);
2623         if (err)
2624                 goto err_iclk_unprepare;
2625
2626         atmel_sha_get_cap(sha_dd);
2627
2628         if (sha_dd->caps.has_dma) {
2629                 err = atmel_sha_dma_init(sha_dd);
2630                 if (err)
2631                         goto err_iclk_unprepare;
2632
2633                 dev_info(dev, "using %s for DMA transfers\n",
2634                                 dma_chan_name(sha_dd->dma_lch_in.chan));
2635         }
2636
2637         spin_lock(&atmel_sha.lock);
2638         list_add_tail(&sha_dd->list, &atmel_sha.dev_list);
2639         spin_unlock(&atmel_sha.lock);
2640
2641         err = atmel_sha_register_algs(sha_dd);
2642         if (err)
2643                 goto err_algs;
2644
2645         dev_info(dev, "Atmel SHA1/SHA256%s%s\n",
2646                         sha_dd->caps.has_sha224 ? "/SHA224" : "",
2647                         sha_dd->caps.has_sha_384_512 ? "/SHA384/SHA512" : "");
2648
2649         return 0;
2650
2651 err_algs:
2652         spin_lock(&atmel_sha.lock);
2653         list_del(&sha_dd->list);
2654         spin_unlock(&atmel_sha.lock);
2655         if (sha_dd->caps.has_dma)
2656                 atmel_sha_dma_cleanup(sha_dd);
2657 err_iclk_unprepare:
2658         clk_unprepare(sha_dd->iclk);
2659 err_tasklet_kill:
2660         tasklet_kill(&sha_dd->queue_task);
2661         tasklet_kill(&sha_dd->done_task);
2662
2663         return err;
2664 }
2665
2666 static int atmel_sha_remove(struct platform_device *pdev)
2667 {
2668         struct atmel_sha_dev *sha_dd;
2669
2670         sha_dd = platform_get_drvdata(pdev);
2671         if (!sha_dd)
2672                 return -ENODEV;
2673         spin_lock(&atmel_sha.lock);
2674         list_del(&sha_dd->list);
2675         spin_unlock(&atmel_sha.lock);
2676
2677         atmel_sha_unregister_algs(sha_dd);
2678
2679         tasklet_kill(&sha_dd->queue_task);
2680         tasklet_kill(&sha_dd->done_task);
2681
2682         if (sha_dd->caps.has_dma)
2683                 atmel_sha_dma_cleanup(sha_dd);
2684
2685         clk_unprepare(sha_dd->iclk);
2686
2687         return 0;
2688 }
2689
2690 static struct platform_driver atmel_sha_driver = {
2691         .probe          = atmel_sha_probe,
2692         .remove         = atmel_sha_remove,
2693         .driver         = {
2694                 .name   = "atmel_sha",
2695                 .of_match_table = of_match_ptr(atmel_sha_dt_ids),
2696         },
2697 };
2698
2699 module_platform_driver(atmel_sha_driver);
2700
2701 MODULE_DESCRIPTION("Atmel SHA (1/256/224/384/512) hw acceleration support.");
2702 MODULE_LICENSE("GPL v2");
2703 MODULE_AUTHOR("Nicolas Royer - Eukréa Electromatique");