drivers/crypto/omap-sham.c

   1 /*
   2  * Cryptographic API.
   3  *
   4  * Support for OMAP SHA1/MD5 HW acceleration.
   5  *
   6  * Copyright (c) 2010 Nokia Corporation
   7  * Author: Dmitry Kasatkin <dmitry.kasatkin@nokia.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as published
  11  * by the Free Software Foundation.
  12  *
  13  * Some ideas are from old omap-sha1-md5.c driver.
  14  */
  15
  16 #define pr_fmt(fmt) "%s: " fmt, __func__
  17
  18 #include <linux/err.h>
  19 #include <linux/device.h>
  20 #include <linux/module.h>
  21 #include <linux/init.h>
  22 #include <linux/errno.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/kernel.h>
  25 #include <linux/clk.h>
  26 #include <linux/irq.h>
  27 #include <linux/io.h>
  28 #include <linux/platform_device.h>
  29 #include <linux/scatterlist.h>
  30 #include <linux/dma-mapping.h>
  31 #include <linux/delay.h>
  32 #include <linux/crypto.h>
  33 #include <linux/cryptohash.h>
  34 #include <crypto/scatterwalk.h>
  35 #include <crypto/algapi.h>
  36 #include <crypto/sha.h>
  37 #include <crypto/hash.h>
  38 #include <crypto/internal/hash.h>
  39
  40 #include <plat/cpu.h>
  41 #include <plat/dma.h>
  42 #include <mach/irqs.h>
  43
  44 #define SHA_REG_DIGEST(x)               (0x00 + ((x) * 0x04))
  45 #define SHA_REG_DIN(x)                  (0x1C + ((x) * 0x04))
  46
  47 #define SHA1_MD5_BLOCK_SIZE             SHA1_BLOCK_SIZE
  48 #define MD5_DIGEST_SIZE                 16
  49
  50 #define SHA_REG_DIGCNT                  0x14
  51
  52 #define SHA_REG_CTRL                    0x18
  53 #define SHA_REG_CTRL_LENGTH             (0xFFFFFFFF << 5)
  54 #define SHA_REG_CTRL_CLOSE_HASH         (1 << 4)
  55 #define SHA_REG_CTRL_ALGO_CONST         (1 << 3)
  56 #define SHA_REG_CTRL_ALGO               (1 << 2)
  57 #define SHA_REG_CTRL_INPUT_READY        (1 << 1)
  58 #define SHA_REG_CTRL_OUTPUT_READY       (1 << 0)
  59
  60 #define SHA_REG_REV                     0x5C
  61 #define SHA_REG_REV_MAJOR               0xF0
  62 #define SHA_REG_REV_MINOR               0x0F
  63
  64 #define SHA_REG_MASK                    0x60
  65 #define SHA_REG_MASK_DMA_EN             (1 << 3)
  66 #define SHA_REG_MASK_IT_EN              (1 << 2)
  67 #define SHA_REG_MASK_SOFTRESET          (1 << 1)
  68 #define SHA_REG_AUTOIDLE                (1 << 0)
  69
  70 #define SHA_REG_SYSSTATUS               0x64
  71 #define SHA_REG_SYSSTATUS_RESETDONE     (1 << 0)
  72
  73 #define DEFAULT_TIMEOUT_INTERVAL        HZ
  74
  75 #define FLAGS_FINUP             0x0002
  76 #define FLAGS_FINAL             0x0004
  77 #define FLAGS_SG                0x0008
  78 #define FLAGS_SHA1              0x0010
  79 #define FLAGS_DMA_ACTIVE        0x0020
  80 #define FLAGS_OUTPUT_READY      0x0040
  81 #define FLAGS_CLEAN             0x0080
  82 #define FLAGS_INIT              0x0100
  83 #define FLAGS_CPU               0x0200
  84 #define FLAGS_HMAC              0x0400
  85 #define FLAGS_ERROR             0x0800
  86 #define FLAGS_BUSY              0x1000
  87
  88 #define OP_UPDATE       1
  89 #define OP_FINAL        2
  90
  91 #define OMAP_ALIGN_MASK         (sizeof(u32)-1)
  92 #define OMAP_ALIGNED            __attribute__((aligned(sizeof(u32))))
  93
  94 #define BUFLEN          PAGE_SIZE
  95
  96 struct omap_sham_dev;
  97
  98 struct omap_sham_reqctx {
  99         struct omap_sham_dev    *dd;
 100         unsigned long           flags;
 101         unsigned long           op;
 102
 103         u8                      digest[SHA1_DIGEST_SIZE] OMAP_ALIGNED;
 104         size_t                  digcnt;
 105         size_t                  bufcnt;
 106         size_t                  buflen;
 107         dma_addr_t              dma_addr;
 108
 109         /* walk state */
 110         struct scatterlist      *sg;
 111         unsigned int            offset; /* offset in current sg */
 112         unsigned int            total;  /* total request */
 113
 114         u8                      buffer[0] OMAP_ALIGNED;
 115 };
 116
 117 struct omap_sham_hmac_ctx {
 118         struct crypto_shash     *shash;
 119         u8                      ipad[SHA1_MD5_BLOCK_SIZE];
 120         u8                      opad[SHA1_MD5_BLOCK_SIZE];
 121 };
 122
 123 struct omap_sham_ctx {
 124         struct omap_sham_dev    *dd;
 125
 126         unsigned long           flags;
 127
 128         /* fallback stuff */
 129         struct crypto_shash     *fallback;
 130
 131         struct omap_sham_hmac_ctx base[0];
 132 };
 133
 134 #define OMAP_SHAM_QUEUE_LENGTH  1
 135
 136 struct omap_sham_dev {
 137         struct list_head        list;
 138         unsigned long           phys_base;
 139         struct device           *dev;
 140         void __iomem            *io_base;
 141         int                     irq;
 142         struct clk              *iclk;
 143         spinlock_t              lock;
 144         int                     err;
 145         int                     dma;
 146         int                     dma_lch;
 147         struct tasklet_struct   done_task;
 148         struct tasklet_struct   queue_task;
 149
 150         unsigned long           flags;
 151         struct crypto_queue     queue;
 152         struct ahash_request    *req;
 153 };
 154
 155 struct omap_sham_drv {
 156         struct list_head        dev_list;
 157         spinlock_t              lock;
 158         unsigned long           flags;
 159 };
 160
 161 static struct omap_sham_drv sham = {
 162         .dev_list = LIST_HEAD_INIT(sham.dev_list),
 163         .lock = __SPIN_LOCK_UNLOCKED(sham.lock),
 164 };
 165
 166 static inline u32 omap_sham_read(struct omap_sham_dev *dd, u32 offset)
 167 {
 168         return __raw_readl(dd->io_base + offset);
 169 }
 170
 171 static inline void omap_sham_write(struct omap_sham_dev *dd,
 172                                         u32 offset, u32 value)
 173 {
 174         __raw_writel(value, dd->io_base + offset);
 175 }
 176
 177 static inline void omap_sham_write_mask(struct omap_sham_dev *dd, u32 address,
 178                                         u32 value, u32 mask)
 179 {
 180         u32 val;
 181
 182         val = omap_sham_read(dd, address);
 183         val &= ~mask;
 184         val |= value;
 185         omap_sham_write(dd, address, val);
 186 }
 187
 188 static inline int omap_sham_wait(struct omap_sham_dev *dd, u32 offset, u32 bit)
 189 {
 190         unsigned long timeout = jiffies + DEFAULT_TIMEOUT_INTERVAL;
 191
 192         while (!(omap_sham_read(dd, offset) & bit)) {
 193                 if (time_is_before_jiffies(timeout))
 194                         return -ETIMEDOUT;
 195         }
 196
 197         return 0;
 198 }
 199
 200 static void omap_sham_copy_hash(struct ahash_request *req, int out)
 201 {
 202         struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
 203         u32 *hash = (u32 *)ctx->digest;
 204         int i;
 205
 206         /* MD5 is almost unused. So copy sha1 size to reduce code */
 207         for (i = 0; i < SHA1_DIGEST_SIZE / sizeof(u32); i++) {
 208                 if (out)
 209                         hash[i] = omap_sham_read(ctx->dd,
 210                                                 SHA_REG_DIGEST(i));
 211                 else
 212                         omap_sham_write(ctx->dd,
 213                                         SHA_REG_DIGEST(i), hash[i]);
 214         }
 215 }
 216
 217 static void omap_sham_copy_ready_hash(struct ahash_request *req)
 218 {
 219         struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
 220         u32 *in = (u32 *)ctx->digest;
 221         u32 *hash = (u32 *)req->result;
 222         int i;
 223
 224         if (!hash)
 225                 return;
 226
 227         if (likely(ctx->flags & FLAGS_SHA1)) {
 228                 /* SHA1 results are in big endian */
 229                 for (i = 0; i < SHA1_DIGEST_SIZE / sizeof(u32); i++)
 230                         hash[i] = be32_to_cpu(in[i]);
 231         } else {
 232                 /* MD5 results are in little endian */
 233                 for (i = 0; i < MD5_DIGEST_SIZE / sizeof(u32); i++)
 234                         hash[i] = le32_to_cpu(in[i]);
 235         }
 236 }
 237
 238 static int omap_sham_hw_init(struct omap_sham_dev *dd)
 239 {
 240         clk_enable(dd->iclk);
 241
 242         if (!(dd->flags & FLAGS_INIT)) {
 243                 omap_sham_write_mask(dd, SHA_REG_MASK,
 244                         SHA_REG_MASK_SOFTRESET, SHA_REG_MASK_SOFTRESET);
 245
 246                 if (omap_sham_wait(dd, SHA_REG_SYSSTATUS,
 247                                         SHA_REG_SYSSTATUS_RESETDONE))
 248                         return -ETIMEDOUT;
 249
 250                 dd->flags |= FLAGS_INIT;
 251                 dd->err = 0;
 252         }
 253
 254         return 0;
 255 }
 256
 257 static void omap_sham_write_ctrl(struct omap_sham_dev *dd, size_t length,
 258                                  int final, int dma)
 259 {
 260         struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
 261         u32 val = length << 5, mask;
 262
 263         if (likely(ctx->digcnt))
 264                 omap_sham_write(dd, SHA_REG_DIGCNT, ctx->digcnt);
 265
 266         omap_sham_write_mask(dd, SHA_REG_MASK,
 267                 SHA_REG_MASK_IT_EN | (dma ? SHA_REG_MASK_DMA_EN : 0),
 268                 SHA_REG_MASK_IT_EN | SHA_REG_MASK_DMA_EN);
 269         /*
 270          * Setting ALGO_CONST only for the first iteration
 271          * and CLOSE_HASH only for the last one.
 272          */
 273         if (ctx->flags & FLAGS_SHA1)
 274                 val |= SHA_REG_CTRL_ALGO;
 275         if (!ctx->digcnt)
 276                 val |= SHA_REG_CTRL_ALGO_CONST;
 277         if (final)
 278                 val |= SHA_REG_CTRL_CLOSE_HASH;
 279
 280         mask = SHA_REG_CTRL_ALGO_CONST | SHA_REG_CTRL_CLOSE_HASH |
 281                         SHA_REG_CTRL_ALGO | SHA_REG_CTRL_LENGTH;
 282
 283         omap_sham_write_mask(dd, SHA_REG_CTRL, val, mask);
 284 }
 285
 286 static int omap_sham_xmit_cpu(struct omap_sham_dev *dd, const u8 *buf,
 287                               size_t length, int final)
 288 {
 289         struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
 290         int count, len32;
 291         const u32 *buffer = (const u32 *)buf;
 292
 293         dev_dbg(dd->dev, "xmit_cpu: digcnt: %d, length: %d, final: %d\n",
 294                                                 ctx->digcnt, length, final);
 295
 296         omap_sham_write_ctrl(dd, length, final, 0);
 297
 298         /* should be non-zero before next lines to disable clocks later */
 299         ctx->digcnt += length;
 300
 301         if (omap_sham_wait(dd, SHA_REG_CTRL, SHA_REG_CTRL_INPUT_READY))
 302                 return -ETIMEDOUT;
 303
 304         if (final)
 305                 ctx->flags |= FLAGS_FINAL; /* catch last interrupt */
 306
 307         len32 = DIV_ROUND_UP(length, sizeof(u32));
 308
 309         for (count = 0; count < len32; count++)
 310                 omap_sham_write(dd, SHA_REG_DIN(count), buffer[count]);
 311
 312         return -EINPROGRESS;
 313 }
 314
 315 static int omap_sham_xmit_dma(struct omap_sham_dev *dd, dma_addr_t dma_addr,
 316                               size_t length, int final)
 317 {
 318         struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
 319         int len32;
 320
 321         dev_dbg(dd->dev, "xmit_dma: digcnt: %d, length: %d, final: %d\n",
 322                                                 ctx->digcnt, length, final);
 323
 324         len32 = DIV_ROUND_UP(length, sizeof(u32));
 325
 326         omap_set_dma_transfer_params(dd->dma_lch, OMAP_DMA_DATA_TYPE_S32, len32,
 327                         1, OMAP_DMA_SYNC_PACKET, dd->dma,
 328                                 OMAP_DMA_DST_SYNC_PREFETCH);
 329
 330         omap_set_dma_src_params(dd->dma_lch, 0, OMAP_DMA_AMODE_POST_INC,
 331                                 dma_addr, 0, 0);
 332
 333         omap_sham_write_ctrl(dd, length, final, 1);
 334
 335         ctx->digcnt += length;
 336
 337         if (final)
 338                 ctx->flags |= FLAGS_FINAL; /* catch last interrupt */
 339
 340         dd->flags |= FLAGS_DMA_ACTIVE;
 341
 342         omap_start_dma(dd->dma_lch);
 343
 344         return -EINPROGRESS;
 345 }
 346
 347 static size_t omap_sham_append_buffer(struct omap_sham_reqctx *ctx,
 348                                 const u8 *data, size_t length)
 349 {
 350         size_t count = min(length, ctx->buflen - ctx->bufcnt);
 351
 352         count = min(count, ctx->total);
 353         if (count <= 0)
 354                 return 0;
 355         memcpy(ctx->buffer + ctx->bufcnt, data, count);
 356         ctx->bufcnt += count;
 357
 358         return count;
 359 }
 360
 361 static size_t omap_sham_append_sg(struct omap_sham_reqctx *ctx)
 362 {
 363         size_t count;
 364
 365         while (ctx->sg) {
 366                 count = omap_sham_append_buffer(ctx,
 367                                 sg_virt(ctx->sg) + ctx->offset,
 368                                 ctx->sg->length - ctx->offset);
 369                 if (!count)
 370                         break;
 371                 ctx->offset += count;
 372                 ctx->total -= count;
 373                 if (ctx->offset == ctx->sg->length) {
 374                         ctx->sg = sg_next(ctx->sg);
 375                         if (ctx->sg)
 376                                 ctx->offset = 0;
 377                         else
 378                                 ctx->total = 0;
 379                 }
 380         }
 381
 382         return 0;
 383 }
 384
 385 static int omap_sham_xmit_dma_map(struct omap_sham_dev *dd,
 386                                         struct omap_sham_reqctx *ctx,
 387                                         size_t length, int final)
 388 {
 389         ctx->dma_addr = dma_map_single(dd->dev, ctx->buffer, ctx->buflen,
 390                                        DMA_TO_DEVICE);
 391         if (dma_mapping_error(dd->dev, ctx->dma_addr)) {
 392                 dev_err(dd->dev, "dma %u bytes error\n", ctx->buflen);
 393                 return -EINVAL;
 394         }
 395
 396         ctx->flags &= ~FLAGS_SG;
 397
 398         /* next call does not fail... so no unmap in the case of error */
 399         return omap_sham_xmit_dma(dd, ctx->dma_addr, length, final);
 400 }
 401
 402 static int omap_sham_update_dma_slow(struct omap_sham_dev *dd)
 403 {
 404         struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
 405         unsigned int final;
 406         size_t count;
 407
 408         omap_sham_append_sg(ctx);
 409
 410         final = (ctx->flags & FLAGS_FINUP) && !ctx->total;
 411
 412         dev_dbg(dd->dev, "slow: bufcnt: %u, digcnt: %d, final: %d\n",
 413                                          ctx->bufcnt, ctx->digcnt, final);
 414
 415         if (final || (ctx->bufcnt == ctx->buflen && ctx->total)) {
 416                 count = ctx->bufcnt;
 417                 ctx->bufcnt = 0;
 418                 return omap_sham_xmit_dma_map(dd, ctx, count, final);
 419         }
 420
 421         return 0;
 422 }
 423
 424 /* Start address alignment */
 425 #define SG_AA(sg)       (IS_ALIGNED(sg->offset, sizeof(u32)))
 426 /* SHA1 block size alignment */
 427 #define SG_SA(sg)       (IS_ALIGNED(sg->length, SHA1_MD5_BLOCK_SIZE))
 428
 429 static int omap_sham_update_dma_start(struct omap_sham_dev *dd)
 430 {
 431         struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
 432         unsigned int length, final, tail;
 433         struct scatterlist *sg;
 434
 435         if (!ctx->total)
 436                 return 0;
 437
 438         if (ctx->bufcnt || ctx->offset)
 439                 return omap_sham_update_dma_slow(dd);
 440
 441         dev_dbg(dd->dev, "fast: digcnt: %d, bufcnt: %u, total: %u\n",
 442                         ctx->digcnt, ctx->bufcnt, ctx->total);
 443
 444         sg = ctx->sg;
 445
 446         if (!SG_AA(sg))
 447                 return omap_sham_update_dma_slow(dd);
 448
 449         if (!sg_is_last(sg) && !SG_SA(sg))
 450                 /* size is not SHA1_BLOCK_SIZE aligned */
 451                 return omap_sham_update_dma_slow(dd);
 452
 453         length = min(ctx->total, sg->length);
 454
 455         if (sg_is_last(sg)) {
 456                 if (!(ctx->flags & FLAGS_FINUP)) {
 457                         /* not last sg must be SHA1_MD5_BLOCK_SIZE aligned */
 458                         tail = length & (SHA1_MD5_BLOCK_SIZE - 1);
 459                         /* without finup() we need one block to close hash */
 460                         if (!tail)
 461                                 tail = SHA1_MD5_BLOCK_SIZE;
 462                         length -= tail;
 463                 }
 464         }
 465
 466         if (!dma_map_sg(dd->dev, ctx->sg, 1, DMA_TO_DEVICE)) {
 467                 dev_err(dd->dev, "dma_map_sg  error\n");
 468                 return -EINVAL;
 469         }
 470
 471         ctx->flags |= FLAGS_SG;
 472
 473         ctx->total -= length;
 474         ctx->offset = length; /* offset where to start slow */
 475
 476         final = (ctx->flags & FLAGS_FINUP) && !ctx->total;
 477
 478         /* next call does not fail... so no unmap in the case of error */
 479         return omap_sham_xmit_dma(dd, sg_dma_address(ctx->sg), length, final);
 480 }
 481
 482 static int omap_sham_update_cpu(struct omap_sham_dev *dd)
 483 {
 484         struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
 485         int bufcnt;
 486
 487         omap_sham_append_sg(ctx);
 488         bufcnt = ctx->bufcnt;
 489         ctx->bufcnt = 0;
 490
 491         return omap_sham_xmit_cpu(dd, ctx->buffer, bufcnt, 1);
 492 }
 493
 494 static int omap_sham_update_dma_stop(struct omap_sham_dev *dd)
 495 {
 496         struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
 497
 498         omap_stop_dma(dd->dma_lch);
 499         if (ctx->flags & FLAGS_SG) {
 500                 dma_unmap_sg(dd->dev, ctx->sg, 1, DMA_TO_DEVICE);
 501                 if (ctx->sg->length == ctx->offset) {
 502                         ctx->sg = sg_next(ctx->sg);
 503                         if (ctx->sg)
 504                                 ctx->offset = 0;
 505                 }
 506         } else {
 507                 dma_unmap_single(dd->dev, ctx->dma_addr, ctx->buflen,
 508                                  DMA_TO_DEVICE);
 509         }
 510
 511         return 0;
 512 }
 513
 514 static void omap_sham_cleanup(struct ahash_request *req)
 515 {
 516         struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
 517         struct omap_sham_dev *dd = ctx->dd;
 518         unsigned long flags;
 519
 520         spin_lock_irqsave(&dd->lock, flags);
 521         if (ctx->flags & FLAGS_CLEAN) {
 522                 spin_unlock_irqrestore(&dd->lock, flags);
 523                 return;
 524         }
 525         ctx->flags |= FLAGS_CLEAN;
 526         spin_unlock_irqrestore(&dd->lock, flags);
 527
 528         if (ctx->digcnt)
 529                 omap_sham_copy_ready_hash(req);
 530
 531         dev_dbg(dd->dev, "digcnt: %d, bufcnt: %d\n", ctx->digcnt, ctx->bufcnt);
 532 }
 533
 534 static int omap_sham_init(struct ahash_request *req)
 535 {
 536         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 537         struct omap_sham_ctx *tctx = crypto_ahash_ctx(tfm);
 538         struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
 539         struct omap_sham_dev *dd = NULL, *tmp;
 540
 541         spin_lock_bh(&sham.lock);
 542         if (!tctx->dd) {
 543                 list_for_each_entry(tmp, &sham.dev_list, list) {
 544                         dd = tmp;
 545                         break;
 546                 }
 547                 tctx->dd = dd;
 548         } else {
 549                 dd = tctx->dd;
 550         }
 551         spin_unlock_bh(&sham.lock);
 552
 553         ctx->dd = dd;
 554
 555         ctx->flags = 0;
 556
 557         dev_dbg(dd->dev, "init: digest size: %d\n",
 558                 crypto_ahash_digestsize(tfm));
 559
 560         if (crypto_ahash_digestsize(tfm) == SHA1_DIGEST_SIZE)
 561                 ctx->flags |= FLAGS_SHA1;
 562
 563         ctx->bufcnt = 0;
 564         ctx->digcnt = 0;
 565         ctx->buflen = BUFLEN;
 566
 567         if (tctx->flags & FLAGS_HMAC) {
 568                 struct omap_sham_hmac_ctx *bctx = tctx->base;
 569
 570                 memcpy(ctx->buffer, bctx->ipad, SHA1_MD5_BLOCK_SIZE);
 571                 ctx->bufcnt = SHA1_MD5_BLOCK_SIZE;
 572                 ctx->flags |= FLAGS_HMAC;
 573         }
 574
 575         return 0;
 576
 577 }
 578
 579 static int omap_sham_update_req(struct omap_sham_dev *dd)
 580 {
 581         struct ahash_request *req = dd->req;
 582         struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
 583         int err;
 584
 585         dev_dbg(dd->dev, "update_req: total: %u, digcnt: %d, finup: %d\n",
 586                  ctx->total, ctx->digcnt, (ctx->flags & FLAGS_FINUP) != 0);
 587
 588         if (ctx->flags & FLAGS_CPU)
 589                 err = omap_sham_update_cpu(dd);
 590         else
 591                 err = omap_sham_update_dma_start(dd);
 592
 593         /* wait for dma completion before can take more data */
 594         dev_dbg(dd->dev, "update: err: %d, digcnt: %d\n", err, ctx->digcnt);
 595
 596         return err;
 597 }
 598
 599 static int omap_sham_final_req(struct omap_sham_dev *dd)
 600 {
 601         struct ahash_request *req = dd->req;
 602         struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
 603         int err = 0, use_dma = 1;
 604
 605         if (ctx->bufcnt <= 64)
 606                 /* faster to handle last block with cpu */
 607                 use_dma = 0;
 608
 609         if (use_dma)
 610                 err = omap_sham_xmit_dma_map(dd, ctx, ctx->bufcnt, 1);
 611         else
 612                 err = omap_sham_xmit_cpu(dd, ctx->buffer, ctx->bufcnt, 1);
 613
 614         ctx->bufcnt = 0;
 615
 616         dev_dbg(dd->dev, "final_req: err: %d\n", err);
 617
 618         return err;
 619 }
 620
 621 static int omap_sham_finish_req_hmac(struct ahash_request *req)
 622 {
 623         struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
 624         struct omap_sham_ctx *tctx = crypto_tfm_ctx(req->base.tfm);
 625         struct omap_sham_hmac_ctx *bctx = tctx->base;
 626         int bs = crypto_shash_blocksize(bctx->shash);
 627         int ds = crypto_shash_digestsize(bctx->shash);
 628         struct {
 629                 struct shash_desc shash;
 630                 char ctx[crypto_shash_descsize(bctx->shash)];
 631         } desc;
 632
 633         desc.shash.tfm = bctx->shash;
 634         desc.shash.flags = 0; /* not CRYPTO_TFM_REQ_MAY_SLEEP */
 635
 636         return crypto_shash_init(&desc.shash) ?:
 637                crypto_shash_update(&desc.shash, bctx->opad, bs) ?:
 638                crypto_shash_finup(&desc.shash, ctx->digest, ds, ctx->digest);
 639 }
 640
 641 static void omap_sham_finish_req(struct ahash_request *req, int err)
 642 {
 643         struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
 644         struct omap_sham_dev *dd = ctx->dd;
 645
 646         if (!err) {
 647                 omap_sham_copy_hash(ctx->dd->req, 1);
 648                 if (ctx->flags & FLAGS_HMAC)
 649                         err = omap_sham_finish_req_hmac(req);
 650         } else {
 651                 ctx->flags |= FLAGS_ERROR;
 652         }
 653
 654         if ((ctx->flags & FLAGS_FINAL) || err)
 655                 omap_sham_cleanup(req);
 656
 657         clk_disable(dd->iclk);
 658         dd->flags &= ~FLAGS_BUSY;
 659
 660         if (req->base.complete)
 661                 req->base.complete(&req->base, err);
 662 }
 663
 664 static int omap_sham_handle_queue(struct omap_sham_dev *dd,
 665                                   struct ahash_request *req)
 666 {
 667         struct crypto_async_request *async_req, *backlog;
 668         struct omap_sham_reqctx *ctx;
 669         struct ahash_request *prev_req;
 670         unsigned long flags;
 671         int err = 0, ret = 0;
 672
 673         spin_lock_irqsave(&dd->lock, flags);
 674         if (req)
 675                 ret = ahash_enqueue_request(&dd->queue, req);
 676         if (dd->flags & FLAGS_BUSY) {
 677                 spin_unlock_irqrestore(&dd->lock, flags);
 678                 return ret;
 679         }
 680         backlog = crypto_get_backlog(&dd->queue);
 681         async_req = crypto_dequeue_request(&dd->queue);
 682         if (async_req)
 683                 dd->flags |= FLAGS_BUSY;
 684         spin_unlock_irqrestore(&dd->lock, flags);
 685
 686         if (!async_req)
 687                 return ret;
 688
 689         if (backlog)
 690                 backlog->complete(backlog, -EINPROGRESS);
 691
 692         req = ahash_request_cast(async_req);
 693
 694         prev_req = dd->req;
 695         dd->req = req;
 696
 697         ctx = ahash_request_ctx(req);
 698
 699         dev_dbg(dd->dev, "handling new req, op: %lu, nbytes: %d\n",
 700                                                 ctx->op, req->nbytes);
 701
 702
 703         err = omap_sham_hw_init(dd);
 704         if (err)
 705                 goto err1;
 706
 707         omap_set_dma_dest_params(dd->dma_lch, 0,
 708                         OMAP_DMA_AMODE_CONSTANT,
 709                         dd->phys_base + SHA_REG_DIN(0), 0, 16);
 710
 711         omap_set_dma_dest_burst_mode(dd->dma_lch,
 712                         OMAP_DMA_DATA_BURST_16);
 713
 714         omap_set_dma_src_burst_mode(dd->dma_lch,
 715                         OMAP_DMA_DATA_BURST_4);
 716
 717         if (ctx->digcnt)
 718                 /* request has changed - restore hash */
 719                 omap_sham_copy_hash(req, 0);
 720
 721         if (ctx->op == OP_UPDATE) {
 722                 err = omap_sham_update_req(dd);
 723                 if (err != -EINPROGRESS && (ctx->flags & FLAGS_FINUP))
 724                         /* no final() after finup() */
 725                         err = omap_sham_final_req(dd);
 726         } else if (ctx->op == OP_FINAL) {
 727                 err = omap_sham_final_req(dd);
 728         }
 729 err1:
 730         if (err != -EINPROGRESS) {
 731                 /* done_task will not finish it, so do it here */
 732                 omap_sham_finish_req(req, err);
 733                 tasklet_schedule(&dd->queue_task);
 734         }
 735
 736         dev_dbg(dd->dev, "exit, err: %d\n", err);
 737
 738         return ret;
 739 }
 740
 741 static int omap_sham_enqueue(struct ahash_request *req, unsigned int op)
 742 {
 743         struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
 744         struct omap_sham_ctx *tctx = crypto_tfm_ctx(req->base.tfm);
 745         struct omap_sham_dev *dd = tctx->dd;
 746
 747         ctx->op = op;
 748
 749         return omap_sham_handle_queue(dd, req);
 750 }
 751
 752 static int omap_sham_update(struct ahash_request *req)
 753 {
 754         struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
 755
 756         if (!req->nbytes)
 757                 return 0;
 758
 759         ctx->total = req->nbytes;
 760         ctx->sg = req->src;
 761         ctx->offset = 0;
 762
 763         if (ctx->flags & FLAGS_FINUP) {
 764                 if ((ctx->digcnt + ctx->bufcnt + ctx->total) < 9) {
 765                         /*
 766                         * OMAP HW accel works only with buffers >= 9
 767                         * will switch to bypass in final()
 768                         * final has the same request and data
 769                         */
 770                         omap_sham_append_sg(ctx);
 771                         return 0;
 772                 } else if (ctx->bufcnt + ctx->total <= SHA1_MD5_BLOCK_SIZE) {
 773                         /*
 774                         * faster to use CPU for short transfers
 775                         */
 776                         ctx->flags |= FLAGS_CPU;
 777                 }
 778         } else if (ctx->bufcnt + ctx->total < ctx->buflen) {
 779                 omap_sham_append_sg(ctx);
 780                 return 0;
 781         }
 782
 783         return omap_sham_enqueue(req, OP_UPDATE);
 784 }
 785
 786 static int omap_sham_shash_digest(struct crypto_shash *shash, u32 flags,
 787                                   const u8 *data, unsigned int len, u8 *out)
 788 {
 789         struct {
 790                 struct shash_desc shash;
 791                 char ctx[crypto_shash_descsize(shash)];
 792         } desc;
 793
 794         desc.shash.tfm = shash;
 795         desc.shash.flags = flags & CRYPTO_TFM_REQ_MAY_SLEEP;
 796
 797         return crypto_shash_digest(&desc.shash, data, len, out);
 798 }
 799
 800 static int omap_sham_final_shash(struct ahash_request *req)
 801 {
 802         struct omap_sham_ctx *tctx = crypto_tfm_ctx(req->base.tfm);
 803         struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
 804
 805         return omap_sham_shash_digest(tctx->fallback, req->base.flags,
 806                                       ctx->buffer, ctx->bufcnt, req->result);
 807 }
 808
 809 static int omap_sham_final(struct ahash_request *req)
 810 {
 811         struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
 812         int err = 0;
 813
 814         ctx->flags |= FLAGS_FINUP;
 815
 816         if (!(ctx->flags & FLAGS_ERROR)) {
 817                 /* OMAP HW accel works only with buffers >= 9 */
 818                 /* HMAC is always >= 9 because of ipad */
 819                 if ((ctx->digcnt + ctx->bufcnt) < 9)
 820                         err = omap_sham_final_shash(req);
 821                 else if (ctx->bufcnt)
 822                         return omap_sham_enqueue(req, OP_FINAL);
 823         }
 824
 825         omap_sham_cleanup(req);
 826
 827         return err;
 828 }
 829
 830 static int omap_sham_finup(struct ahash_request *req)
 831 {
 832         struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
 833         int err1, err2;
 834
 835         ctx->flags |= FLAGS_FINUP;
 836
 837         err1 = omap_sham_update(req);
 838         if (err1 == -EINPROGRESS)
 839                 return err1;
 840         /*
 841          * final() has to be always called to cleanup resources
 842          * even if udpate() failed, except EINPROGRESS
 843          */
 844         err2 = omap_sham_final(req);
 845
 846         return err1 ?: err2;
 847 }
 848
 849 static int omap_sham_digest(struct ahash_request *req)
 850 {
 851         return omap_sham_init(req) ?: omap_sham_finup(req);
 852 }
 853
 854 static int omap_sham_setkey(struct crypto_ahash *tfm, const u8 *key,
 855                       unsigned int keylen)
 856 {
 857         struct omap_sham_ctx *tctx = crypto_ahash_ctx(tfm);
 858         struct omap_sham_hmac_ctx *bctx = tctx->base;
 859         int bs = crypto_shash_blocksize(bctx->shash);
 860         int ds = crypto_shash_digestsize(bctx->shash);
 861         int err, i;
 862         err = crypto_shash_setkey(tctx->fallback, key, keylen);
 863         if (err)
 864                 return err;
 865
 866         if (keylen > bs) {
 867                 err = omap_sham_shash_digest(bctx->shash,
 868                                 crypto_shash_get_flags(bctx->shash),
 869                                 key, keylen, bctx->ipad);
 870                 if (err)
 871                         return err;
 872                 keylen = ds;
 873         } else {
 874                 memcpy(bctx->ipad, key, keylen);
 875         }
 876
 877         memset(bctx->ipad + keylen, 0, bs - keylen);
 878         memcpy(bctx->opad, bctx->ipad, bs);
 879
 880         for (i = 0; i < bs; i++) {
 881                 bctx->ipad[i] ^= 0x36;
 882                 bctx->opad[i] ^= 0x5c;
 883         }
 884
 885         return err;
 886 }
 887
 888 static int omap_sham_cra_init_alg(struct crypto_tfm *tfm, const char *alg_base)
 889 {
 890         struct omap_sham_ctx *tctx = crypto_tfm_ctx(tfm);
 891         const char *alg_name = crypto_tfm_alg_name(tfm);
 892
 893         pr_info("enter\n");
 894
 895         /* Allocate a fallback and abort if it failed. */
 896         tctx->fallback = crypto_alloc_shash(alg_name, 0,
 897                                             CRYPTO_ALG_NEED_FALLBACK);
 898         if (IS_ERR(tctx->fallback)) {
 899                 pr_err("omap-sham: fallback driver '%s' "
 900                                 "could not be loaded.\n", alg_name);
 901                 return PTR_ERR(tctx->fallback);
 902         }
 903
 904         crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
 905                                  sizeof(struct omap_sham_reqctx) + BUFLEN);
 906
 907         if (alg_base) {
 908                 struct omap_sham_hmac_ctx *bctx = tctx->base;
 909                 tctx->flags |= FLAGS_HMAC;
 910                 bctx->shash = crypto_alloc_shash(alg_base, 0,
 911                                                 CRYPTO_ALG_NEED_FALLBACK);
 912                 if (IS_ERR(bctx->shash)) {
 913                         pr_err("omap-sham: base driver '%s' "
 914                                         "could not be loaded.\n", alg_base);
 915                         crypto_free_shash(tctx->fallback);
 916                         return PTR_ERR(bctx->shash);
 917                 }
 918
 919         }
 920
 921         return 0;
 922 }
 923
 924 static int omap_sham_cra_init(struct crypto_tfm *tfm)
 925 {
 926         return omap_sham_cra_init_alg(tfm, NULL);
 927 }
 928
 929 static int omap_sham_cra_sha1_init(struct crypto_tfm *tfm)
 930 {
 931         return omap_sham_cra_init_alg(tfm, "sha1");
 932 }
 933
 934 static int omap_sham_cra_md5_init(struct crypto_tfm *tfm)
 935 {
 936         return omap_sham_cra_init_alg(tfm, "md5");
 937 }
 938
 939 static void omap_sham_cra_exit(struct crypto_tfm *tfm)
 940 {
 941         struct omap_sham_ctx *tctx = crypto_tfm_ctx(tfm);
 942
 943         crypto_free_shash(tctx->fallback);
 944         tctx->fallback = NULL;
 945
 946         if (tctx->flags & FLAGS_HMAC) {
 947                 struct omap_sham_hmac_ctx *bctx = tctx->base;
 948                 crypto_free_shash(bctx->shash);
 949         }
 950 }
 951
 952 static struct ahash_alg algs[] = {
 953 {
 954         .init           = omap_sham_init,
 955         .update         = omap_sham_update,
 956         .final          = omap_sham_final,
 957         .finup          = omap_sham_finup,
 958         .digest         = omap_sham_digest,
 959         .halg.digestsize        = SHA1_DIGEST_SIZE,
 960         .halg.base      = {
 961                 .cra_name               = "sha1",
 962                 .cra_driver_name        = "omap-sha1",
 963                 .cra_priority           = 100,
 964                 .cra_flags              = CRYPTO_ALG_TYPE_AHASH |
 965                                                 CRYPTO_ALG_ASYNC |
 966                                                 CRYPTO_ALG_NEED_FALLBACK,
 967                 .cra_blocksize          = SHA1_BLOCK_SIZE,
 968                 .cra_ctxsize            = sizeof(struct omap_sham_ctx),
 969                 .cra_alignmask          = 0,
 970                 .cra_module             = THIS_MODULE,
 971                 .cra_init               = omap_sham_cra_init,
 972                 .cra_exit               = omap_sham_cra_exit,
 973         }
 974 },
 975 {
 976         .init           = omap_sham_init,
 977         .update         = omap_sham_update,
 978         .final          = omap_sham_final,
 979         .finup          = omap_sham_finup,
 980         .digest         = omap_sham_digest,
 981         .halg.digestsize        = MD5_DIGEST_SIZE,
 982         .halg.base      = {
 983                 .cra_name               = "md5",
 984                 .cra_driver_name        = "omap-md5",
 985                 .cra_priority           = 100,
 986                 .cra_flags              = CRYPTO_ALG_TYPE_AHASH |
 987                                                 CRYPTO_ALG_ASYNC |
 988                                                 CRYPTO_ALG_NEED_FALLBACK,
 989                 .cra_blocksize          = SHA1_BLOCK_SIZE,
 990                 .cra_ctxsize            = sizeof(struct omap_sham_ctx),
 991                 .cra_alignmask          = OMAP_ALIGN_MASK,
 992                 .cra_module             = THIS_MODULE,
 993                 .cra_init               = omap_sham_cra_init,
 994                 .cra_exit               = omap_sham_cra_exit,
 995         }
 996 },
 997 {
 998         .init           = omap_sham_init,
 999         .update         = omap_sham_update,
1000         .final          = omap_sham_final,
1001         .finup          = omap_sham_finup,
1002         .digest         = omap_sham_digest,
1003         .setkey         = omap_sham_setkey,
1004         .halg.digestsize        = SHA1_DIGEST_SIZE,
1005         .halg.base      = {
1006                 .cra_name               = "hmac(sha1)",
1007                 .cra_driver_name        = "omap-hmac-sha1",
1008                 .cra_priority           = 100,
1009                 .cra_flags              = CRYPTO_ALG_TYPE_AHASH |
1010                                                 CRYPTO_ALG_ASYNC |
1011                                                 CRYPTO_ALG_NEED_FALLBACK,
1012                 .cra_blocksize          = SHA1_BLOCK_SIZE,
1013                 .cra_ctxsize            = sizeof(struct omap_sham_ctx) +
1014                                         sizeof(struct omap_sham_hmac_ctx),
1015                 .cra_alignmask          = OMAP_ALIGN_MASK,
1016                 .cra_module             = THIS_MODULE,
1017                 .cra_init               = omap_sham_cra_sha1_init,
1018                 .cra_exit               = omap_sham_cra_exit,
1019         }
1020 },
1021 {
1022         .init           = omap_sham_init,
1023         .update         = omap_sham_update,
1024         .final          = omap_sham_final,
1025         .finup          = omap_sham_finup,
1026         .digest         = omap_sham_digest,
1027         .setkey         = omap_sham_setkey,
1028         .halg.digestsize        = MD5_DIGEST_SIZE,
1029         .halg.base      = {
1030                 .cra_name               = "hmac(md5)",
1031                 .cra_driver_name        = "omap-hmac-md5",
1032                 .cra_priority           = 100,
1033                 .cra_flags              = CRYPTO_ALG_TYPE_AHASH |
1034                                                 CRYPTO_ALG_ASYNC |
1035                                                 CRYPTO_ALG_NEED_FALLBACK,
1036                 .cra_blocksize          = SHA1_BLOCK_SIZE,
1037                 .cra_ctxsize            = sizeof(struct omap_sham_ctx) +
1038                                         sizeof(struct omap_sham_hmac_ctx),
1039                 .cra_alignmask          = OMAP_ALIGN_MASK,
1040                 .cra_module             = THIS_MODULE,
1041                 .cra_init               = omap_sham_cra_md5_init,
1042                 .cra_exit               = omap_sham_cra_exit,
1043         }
1044 }
1045 };
1046
1047 static void omap_sham_done_task(unsigned long data)
1048 {
1049         struct omap_sham_dev *dd = (struct omap_sham_dev *)data;
1050         struct ahash_request *req = dd->req;
1051         struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
1052         int ready = 0, err = 0;
1053
1054         if (ctx->flags & FLAGS_OUTPUT_READY) {
1055                 ctx->flags &= ~FLAGS_OUTPUT_READY;
1056                 ready = 1;
1057         }
1058
1059         if (dd->flags & FLAGS_DMA_ACTIVE) {
1060                 dd->flags &= ~FLAGS_DMA_ACTIVE;
1061                 omap_sham_update_dma_stop(dd);
1062                 if (!dd->err)
1063                         err = omap_sham_update_dma_start(dd);
1064         }
1065
1066         err = dd->err ? : err;
1067
1068         if (err != -EINPROGRESS && (ready || err)) {
1069                 dev_dbg(dd->dev, "update done: err: %d\n", err);
1070                 /* finish curent request */
1071                 omap_sham_finish_req(req, err);
1072                 /* start new request */
1073                 omap_sham_handle_queue(dd, NULL);
1074         }
1075 }
1076
1077 static void omap_sham_queue_task(unsigned long data)
1078 {
1079         struct omap_sham_dev *dd = (struct omap_sham_dev *)data;
1080
1081         omap_sham_handle_queue(dd, NULL);
1082 }
1083
1084 static irqreturn_t omap_sham_irq(int irq, void *dev_id)
1085 {
1086         struct omap_sham_dev *dd = dev_id;
1087         struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
1088
1089         if (!ctx) {
1090                 dev_err(dd->dev, "unknown interrupt.\n");
1091                 return IRQ_HANDLED;
1092         }
1093
1094         if (unlikely(ctx->flags & FLAGS_FINAL))
1095                 /* final -> allow device to go to power-saving mode */
1096                 omap_sham_write_mask(dd, SHA_REG_CTRL, 0, SHA_REG_CTRL_LENGTH);
1097
1098         omap_sham_write_mask(dd, SHA_REG_CTRL, SHA_REG_CTRL_OUTPUT_READY,
1099                                  SHA_REG_CTRL_OUTPUT_READY);
1100         omap_sham_read(dd, SHA_REG_CTRL);
1101
1102         ctx->flags |= FLAGS_OUTPUT_READY;
1103         dd->err = 0;
1104         tasklet_schedule(&dd->done_task);
1105
1106         return IRQ_HANDLED;
1107 }
1108
1109 static void omap_sham_dma_callback(int lch, u16 ch_status, void *data)
1110 {
1111         struct omap_sham_dev *dd = data;
1112
1113         if (ch_status != OMAP_DMA_BLOCK_IRQ) {
1114                 pr_err("omap-sham DMA error status: 0x%hx\n", ch_status);
1115                 dd->err = -EIO;
1116                 dd->flags &= ~FLAGS_INIT; /* request to re-initialize */
1117         }
1118
1119         tasklet_schedule(&dd->done_task);
1120 }
1121
1122 static int omap_sham_dma_init(struct omap_sham_dev *dd)
1123 {
1124         int err;
1125
1126         dd->dma_lch = -1;
1127
1128         err = omap_request_dma(dd->dma, dev_name(dd->dev),
1129                         omap_sham_dma_callback, dd, &dd->dma_lch);
1130         if (err) {
1131                 dev_err(dd->dev, "Unable to request DMA channel\n");
1132                 return err;
1133         }
1134
1135         return 0;
1136 }
1137
1138 static void omap_sham_dma_cleanup(struct omap_sham_dev *dd)
1139 {
1140         if (dd->dma_lch >= 0) {
1141                 omap_free_dma(dd->dma_lch);
1142                 dd->dma_lch = -1;
1143         }
1144 }
1145
1146 static int __devinit omap_sham_probe(struct platform_device *pdev)
1147 {
1148         struct omap_sham_dev *dd;
1149         struct device *dev = &pdev->dev;
1150         struct resource *res;
1151         int err, i, j;
1152
1153         dd = kzalloc(sizeof(struct omap_sham_dev), GFP_KERNEL);
1154         if (dd == NULL) {
1155                 dev_err(dev, "unable to alloc data struct.\n");
1156                 err = -ENOMEM;
1157                 goto data_err;
1158         }
1159         dd->dev = dev;
1160         platform_set_drvdata(pdev, dd);
1161
1162         INIT_LIST_HEAD(&dd->list);
1163         spin_lock_init(&dd->lock);
1164         tasklet_init(&dd->done_task, omap_sham_done_task, (unsigned long)dd);
1165         tasklet_init(&dd->queue_task, omap_sham_queue_task, (unsigned long)dd);
1166         crypto_init_queue(&dd->queue, OMAP_SHAM_QUEUE_LENGTH);
1167
1168         dd->irq = -1;
1169
1170         /* Get the base address */
1171         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1172         if (!res) {
1173                 dev_err(dev, "no MEM resource info\n");
1174                 err = -ENODEV;
1175                 goto res_err;
1176         }
1177         dd->phys_base = res->start;
1178
1179         /* Get the DMA */
1180         res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
1181         if (!res) {
1182                 dev_err(dev, "no DMA resource info\n");
1183                 err = -ENODEV;
1184                 goto res_err;
1185         }
1186         dd->dma = res->start;
1187
1188         /* Get the IRQ */
1189         dd->irq = platform_get_irq(pdev,  0);
1190         if (dd->irq < 0) {
1191                 dev_err(dev, "no IRQ resource info\n");
1192                 err = dd->irq;
1193                 goto res_err;
1194         }
1195
1196         err = request_irq(dd->irq, omap_sham_irq,
1197                         IRQF_TRIGGER_LOW, dev_name(dev), dd);
1198         if (err) {
1199                 dev_err(dev, "unable to request irq.\n");
1200                 goto res_err;
1201         }
1202
1203         err = omap_sham_dma_init(dd);
1204         if (err)
1205                 goto dma_err;
1206
1207         /* Initializing the clock */
1208         dd->iclk = clk_get(dev, "ick");
1209         if (IS_ERR(dd->iclk)) {
1210                 dev_err(dev, "clock intialization failed.\n");
1211                 err = PTR_ERR(dd->iclk);
1212                 goto clk_err;
1213         }
1214
1215         dd->io_base = ioremap(dd->phys_base, SZ_4K);
1216         if (!dd->io_base) {
1217                 dev_err(dev, "can't ioremap\n");
1218                 err = -ENOMEM;
1219                 goto io_err;
1220         }
1221
1222         clk_enable(dd->iclk);
1223         dev_info(dev, "hw accel on OMAP rev %u.%u\n",
1224                 (omap_sham_read(dd, SHA_REG_REV) & SHA_REG_REV_MAJOR) >> 4,
1225                 omap_sham_read(dd, SHA_REG_REV) & SHA_REG_REV_MINOR);
1226         clk_disable(dd->iclk);
1227
1228         spin_lock(&sham.lock);
1229         list_add_tail(&dd->list, &sham.dev_list);
1230         spin_unlock(&sham.lock);
1231
1232         for (i = 0; i < ARRAY_SIZE(algs); i++) {
1233                 err = crypto_register_ahash(&algs[i]);
1234                 if (err)
1235                         goto err_algs;
1236         }
1237
1238         return 0;
1239
1240 err_algs:
1241         for (j = 0; j < i; j++)
1242                 crypto_unregister_ahash(&algs[j]);
1243         iounmap(dd->io_base);
1244 io_err:
1245         clk_put(dd->iclk);
1246 clk_err:
1247         omap_sham_dma_cleanup(dd);
1248 dma_err:
1249         if (dd->irq >= 0)
1250                 free_irq(dd->irq, dd);
1251 res_err:
1252         kfree(dd);
1253         dd = NULL;
1254 data_err:
1255         dev_err(dev, "initialization failed.\n");
1256
1257         return err;
1258 }
1259
1260 static int __devexit omap_sham_remove(struct platform_device *pdev)
1261 {
1262         static struct omap_sham_dev *dd;
1263         int i;
1264
1265         dd = platform_get_drvdata(pdev);
1266         if (!dd)
1267                 return -ENODEV;
1268         spin_lock(&sham.lock);
1269         list_del(&dd->list);
1270         spin_unlock(&sham.lock);
1271         for (i = 0; i < ARRAY_SIZE(algs); i++)
1272                 crypto_unregister_ahash(&algs[i]);
1273         tasklet_kill(&dd->done_task);
1274         tasklet_kill(&dd->queue_task);
1275         iounmap(dd->io_base);
1276         clk_put(dd->iclk);
1277         omap_sham_dma_cleanup(dd);
1278         if (dd->irq >= 0)
1279                 free_irq(dd->irq, dd);
1280         kfree(dd);
1281         dd = NULL;
1282
1283         return 0;
1284 }
1285
1286 static struct platform_driver omap_sham_driver = {
1287         .probe  = omap_sham_probe,
1288         .remove = omap_sham_remove,
1289         .driver = {
1290                 .name   = "omap-sham",
1291                 .owner  = THIS_MODULE,
1292         },
1293 };
1294
1295 static int __init omap_sham_mod_init(void)
1296 {
1297         pr_info("loading %s driver\n", "omap-sham");
1298
1299         if (!cpu_class_is_omap2() ||
1300                 omap_type() != OMAP2_DEVICE_TYPE_SEC) {
1301                 pr_err("Unsupported cpu\n");
1302                 return -ENODEV;
1303         }
1304
1305         return platform_driver_register(&omap_sham_driver);
1306 }
1307
1308 static void __exit omap_sham_mod_exit(void)
1309 {
1310         platform_driver_unregister(&omap_sham_driver);
1311 }
1312
1313 module_init(omap_sham_mod_init);
1314 module_exit(omap_sham_mod_exit);
1315
1316 MODULE_DESCRIPTION("OMAP SHA1/MD5 hw acceleration support.");
1317 MODULE_LICENSE("GPL v2");
1318 MODULE_AUTHOR("Dmitry Kasatkin");