drivers/crypto/omap-aes.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Cryptographic API.
   4  *
   5  * Support for OMAP AES HW acceleration.
   6  *
   7  * Copyright (c) 2010 Nokia Corporation
   8  * Author: Dmitry Kasatkin <dmitry.kasatkin@nokia.com>
   9  * Copyright (c) 2011 Texas Instruments Incorporated
  10  */
  11
  12 #define pr_fmt(fmt) "%20s: " fmt, __func__
  13 #define prn(num) pr_debug(#num "=%d\n", num)
  14 #define prx(num) pr_debug(#num "=%x\n", num)
  15
  16 #include <crypto/aes.h>
  17 #include <crypto/gcm.h>
  18 #include <crypto/internal/aead.h>
  19 #include <crypto/internal/engine.h>
  20 #include <crypto/internal/skcipher.h>
  21 #include <crypto/scatterwalk.h>
  22 #include <linux/dma-mapping.h>
  23 #include <linux/dmaengine.h>
  24 #include <linux/err.h>
  25 #include <linux/init.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/io.h>
  28 #include <linux/kernel.h>
  29 #include <linux/module.h>
  30 #include <linux/of.h>
  31 #include <linux/of_address.h>
  32 #include <linux/platform_device.h>
  33 #include <linux/pm_runtime.h>
  34 #include <linux/scatterlist.h>
  35 #include <linux/string.h>
  36
  37 #include "omap-crypto.h"
  38 #include "omap-aes.h"
  39
  40 /* keep registered devices data here */
  41 static LIST_HEAD(dev_list);
  42 static DEFINE_SPINLOCK(list_lock);
  43
  44 static int aes_fallback_sz = 200;
  45
  46 #ifdef DEBUG
  47 #define omap_aes_read(dd, offset)                               \
  48 ({                                                              \
  49         int _read_ret;                                          \
  50         _read_ret = __raw_readl(dd->io_base + offset);          \
  51         pr_debug("omap_aes_read(" #offset "=%#x)= %#x\n",       \
  52                  offset, _read_ret);                            \
  53         _read_ret;                                              \
  54 })
  55 #else
  56 inline u32 omap_aes_read(struct omap_aes_dev *dd, u32 offset)
  57 {
  58         return __raw_readl(dd->io_base + offset);
  59 }
  60 #endif
  61
  62 #ifdef DEBUG
  63 #define omap_aes_write(dd, offset, value)                               \
  64         do {                                                            \
  65                 pr_debug("omap_aes_write(" #offset "=%#x) value=%#x\n", \
  66                          offset, value);                                \
  67                 __raw_writel(value, dd->io_base + offset);              \
  68         } while (0)
  69 #else
  70 inline void omap_aes_write(struct omap_aes_dev *dd, u32 offset,
  71                                   u32 value)
  72 {
  73         __raw_writel(value, dd->io_base + offset);
  74 }
  75 #endif
  76
  77 static inline void omap_aes_write_mask(struct omap_aes_dev *dd, u32 offset,
  78                                         u32 value, u32 mask)
  79 {
  80         u32 val;
  81
  82         val = omap_aes_read(dd, offset);
  83         val &= ~mask;
  84         val |= value;
  85         omap_aes_write(dd, offset, val);
  86 }
  87
  88 static void omap_aes_write_n(struct omap_aes_dev *dd, u32 offset,
  89                                         u32 *value, int count)
  90 {
  91         for (; count--; value++, offset += 4)
  92                 omap_aes_write(dd, offset, *value);
  93 }
  94
  95 static int omap_aes_hw_init(struct omap_aes_dev *dd)
  96 {
  97         int err;
  98
  99         if (!(dd->flags & FLAGS_INIT)) {
 100                 dd->flags |= FLAGS_INIT;
 101                 dd->err = 0;
 102         }
 103
 104         err = pm_runtime_resume_and_get(dd->dev);
 105         if (err < 0) {
 106                 dev_err(dd->dev, "failed to get sync: %d\n", err);
 107                 return err;
 108         }
 109
 110         return 0;
 111 }
 112
 113 void omap_aes_clear_copy_flags(struct omap_aes_dev *dd)
 114 {
 115         dd->flags &= ~(OMAP_CRYPTO_COPY_MASK << FLAGS_IN_DATA_ST_SHIFT);
 116         dd->flags &= ~(OMAP_CRYPTO_COPY_MASK << FLAGS_OUT_DATA_ST_SHIFT);
 117         dd->flags &= ~(OMAP_CRYPTO_COPY_MASK << FLAGS_ASSOC_DATA_ST_SHIFT);
 118 }
 119
 120 int omap_aes_write_ctrl(struct omap_aes_dev *dd)
 121 {
 122         struct omap_aes_reqctx *rctx;
 123         unsigned int key32;
 124         int i, err;
 125         u32 val;
 126
 127         err = omap_aes_hw_init(dd);
 128         if (err)
 129                 return err;
 130
 131         key32 = dd->ctx->keylen / sizeof(u32);
 132
 133         /* RESET the key as previous HASH keys should not get affected*/
 134         if (dd->flags & FLAGS_GCM)
 135                 for (i = 0; i < 0x40; i = i + 4)
 136                         omap_aes_write(dd, i, 0x0);
 137
 138         for (i = 0; i < key32; i++) {
 139                 omap_aes_write(dd, AES_REG_KEY(dd, i),
 140                                (__force u32)cpu_to_le32(dd->ctx->key[i]));
 141         }
 142
 143         if ((dd->flags & (FLAGS_CBC | FLAGS_CTR)) && dd->req->iv)
 144                 omap_aes_write_n(dd, AES_REG_IV(dd, 0), (void *)dd->req->iv, 4);
 145
 146         if ((dd->flags & (FLAGS_GCM)) && dd->aead_req->iv) {
 147                 rctx = aead_request_ctx(dd->aead_req);
 148                 omap_aes_write_n(dd, AES_REG_IV(dd, 0), (u32 *)rctx->iv, 4);
 149         }
 150
 151         val = FLD_VAL(((dd->ctx->keylen >> 3) - 1), 4, 3);
 152         if (dd->flags & FLAGS_CBC)
 153                 val |= AES_REG_CTRL_CBC;
 154
 155         if (dd->flags & (FLAGS_CTR | FLAGS_GCM))
 156                 val |= AES_REG_CTRL_CTR | AES_REG_CTRL_CTR_WIDTH_128;
 157
 158         if (dd->flags & FLAGS_GCM)
 159                 val |= AES_REG_CTRL_GCM;
 160
 161         if (dd->flags & FLAGS_ENCRYPT)
 162                 val |= AES_REG_CTRL_DIRECTION;
 163
 164         omap_aes_write_mask(dd, AES_REG_CTRL(dd), val, AES_REG_CTRL_MASK);
 165
 166         return 0;
 167 }
 168
 169 static void omap_aes_dma_trigger_omap2(struct omap_aes_dev *dd, int length)
 170 {
 171         u32 mask, val;
 172
 173         val = dd->pdata->dma_start;
 174
 175         if (dd->dma_lch_out != NULL)
 176                 val |= dd->pdata->dma_enable_out;
 177         if (dd->dma_lch_in != NULL)
 178                 val |= dd->pdata->dma_enable_in;
 179
 180         mask = dd->pdata->dma_enable_out | dd->pdata->dma_enable_in |
 181                dd->pdata->dma_start;
 182
 183         omap_aes_write_mask(dd, AES_REG_MASK(dd), val, mask);
 184
 185 }
 186
 187 static void omap_aes_dma_trigger_omap4(struct omap_aes_dev *dd, int length)
 188 {
 189         omap_aes_write(dd, AES_REG_LENGTH_N(0), length);
 190         omap_aes_write(dd, AES_REG_LENGTH_N(1), 0);
 191         if (dd->flags & FLAGS_GCM)
 192                 omap_aes_write(dd, AES_REG_A_LEN, dd->assoc_len);
 193
 194         omap_aes_dma_trigger_omap2(dd, length);
 195 }
 196
 197 static void omap_aes_dma_stop(struct omap_aes_dev *dd)
 198 {
 199         u32 mask;
 200
 201         mask = dd->pdata->dma_enable_out | dd->pdata->dma_enable_in |
 202                dd->pdata->dma_start;
 203
 204         omap_aes_write_mask(dd, AES_REG_MASK(dd), 0, mask);
 205 }
 206
 207 struct omap_aes_dev *omap_aes_find_dev(struct omap_aes_reqctx *rctx)
 208 {
 209         struct omap_aes_dev *dd;
 210
 211         spin_lock_bh(&list_lock);
 212         dd = list_first_entry(&dev_list, struct omap_aes_dev, list);
 213         list_move_tail(&dd->list, &dev_list);
 214         rctx->dd = dd;
 215         spin_unlock_bh(&list_lock);
 216
 217         return dd;
 218 }
 219
 220 static void omap_aes_dma_out_callback(void *data)
 221 {
 222         struct omap_aes_dev *dd = data;
 223
 224         /* dma_lch_out - completed */
 225         tasklet_schedule(&dd->done_task);
 226 }
 227
 228 static int omap_aes_dma_init(struct omap_aes_dev *dd)
 229 {
 230         int err;
 231
 232         dd->dma_lch_out = NULL;
 233         dd->dma_lch_in = NULL;
 234
 235         dd->dma_lch_in = dma_request_chan(dd->dev, "rx");
 236         if (IS_ERR(dd->dma_lch_in)) {
 237                 dev_err(dd->dev, "Unable to request in DMA channel\n");
 238                 return PTR_ERR(dd->dma_lch_in);
 239         }
 240
 241         dd->dma_lch_out = dma_request_chan(dd->dev, "tx");
 242         if (IS_ERR(dd->dma_lch_out)) {
 243                 dev_err(dd->dev, "Unable to request out DMA channel\n");
 244                 err = PTR_ERR(dd->dma_lch_out);
 245                 goto err_dma_out;
 246         }
 247
 248         return 0;
 249
 250 err_dma_out:
 251         dma_release_channel(dd->dma_lch_in);
 252
 253         return err;
 254 }
 255
 256 static void omap_aes_dma_cleanup(struct omap_aes_dev *dd)
 257 {
 258         if (dd->pio_only)
 259                 return;
 260
 261         dma_release_channel(dd->dma_lch_out);
 262         dma_release_channel(dd->dma_lch_in);
 263 }
 264
 265 static int omap_aes_crypt_dma(struct omap_aes_dev *dd,
 266                               struct scatterlist *in_sg,
 267                               struct scatterlist *out_sg,
 268                               int in_sg_len, int out_sg_len)
 269 {
 270         struct dma_async_tx_descriptor *tx_in, *tx_out = NULL, *cb_desc;
 271         struct dma_slave_config cfg;
 272         int ret;
 273
 274         if (dd->pio_only) {
 275                 scatterwalk_start(&dd->in_walk, dd->in_sg);
 276                 if (out_sg_len)
 277                         scatterwalk_start(&dd->out_walk, dd->out_sg);
 278
 279                 /* Enable DATAIN interrupt and let it take
 280                    care of the rest */
 281                 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x2);
 282                 return 0;
 283         }
 284
 285         dma_sync_sg_for_device(dd->dev, dd->in_sg, in_sg_len, DMA_TO_DEVICE);
 286
 287         memset(&cfg, 0, sizeof(cfg));
 288
 289         cfg.src_addr = dd->phys_base + AES_REG_DATA_N(dd, 0);
 290         cfg.dst_addr = dd->phys_base + AES_REG_DATA_N(dd, 0);
 291         cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 292         cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 293         cfg.src_maxburst = DST_MAXBURST;
 294         cfg.dst_maxburst = DST_MAXBURST;
 295
 296         /* IN */
 297         ret = dmaengine_slave_config(dd->dma_lch_in, &cfg);
 298         if (ret) {
 299                 dev_err(dd->dev, "can't configure IN dmaengine slave: %d\n",
 300                         ret);
 301                 return ret;
 302         }
 303
 304         tx_in = dmaengine_prep_slave_sg(dd->dma_lch_in, in_sg, in_sg_len,
 305                                         DMA_MEM_TO_DEV,
 306                                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 307         if (!tx_in) {
 308                 dev_err(dd->dev, "IN prep_slave_sg() failed\n");
 309                 return -EINVAL;
 310         }
 311
 312         /* No callback necessary */
 313         tx_in->callback_param = dd;
 314         tx_in->callback = NULL;
 315
 316         /* OUT */
 317         if (out_sg_len) {
 318                 ret = dmaengine_slave_config(dd->dma_lch_out, &cfg);
 319                 if (ret) {
 320                         dev_err(dd->dev, "can't configure OUT dmaengine slave: %d\n",
 321                                 ret);
 322                         return ret;
 323                 }
 324
 325                 tx_out = dmaengine_prep_slave_sg(dd->dma_lch_out, out_sg,
 326                                                  out_sg_len,
 327                                                  DMA_DEV_TO_MEM,
 328                                                  DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 329                 if (!tx_out) {
 330                         dev_err(dd->dev, "OUT prep_slave_sg() failed\n");
 331                         return -EINVAL;
 332                 }
 333
 334                 cb_desc = tx_out;
 335         } else {
 336                 cb_desc = tx_in;
 337         }
 338
 339         if (dd->flags & FLAGS_GCM)
 340                 cb_desc->callback = omap_aes_gcm_dma_out_callback;
 341         else
 342                 cb_desc->callback = omap_aes_dma_out_callback;
 343         cb_desc->callback_param = dd;
 344
 345
 346         dmaengine_submit(tx_in);
 347         if (tx_out)
 348                 dmaengine_submit(tx_out);
 349
 350         dma_async_issue_pending(dd->dma_lch_in);
 351         if (out_sg_len)
 352                 dma_async_issue_pending(dd->dma_lch_out);
 353
 354         /* start DMA */
 355         dd->pdata->trigger(dd, dd->total);
 356
 357         return 0;
 358 }
 359
 360 int omap_aes_crypt_dma_start(struct omap_aes_dev *dd)
 361 {
 362         int err;
 363
 364         pr_debug("total: %zu\n", dd->total);
 365
 366         if (!dd->pio_only) {
 367                 err = dma_map_sg(dd->dev, dd->in_sg, dd->in_sg_len,
 368                                  DMA_TO_DEVICE);
 369                 if (!err) {
 370                         dev_err(dd->dev, "dma_map_sg() error\n");
 371                         return -EINVAL;
 372                 }
 373
 374                 if (dd->out_sg_len) {
 375                         err = dma_map_sg(dd->dev, dd->out_sg, dd->out_sg_len,
 376                                          DMA_FROM_DEVICE);
 377                         if (!err) {
 378                                 dev_err(dd->dev, "dma_map_sg() error\n");
 379                                 return -EINVAL;
 380                         }
 381                 }
 382         }
 383
 384         err = omap_aes_crypt_dma(dd, dd->in_sg, dd->out_sg, dd->in_sg_len,
 385                                  dd->out_sg_len);
 386         if (err && !dd->pio_only) {
 387                 dma_unmap_sg(dd->dev, dd->in_sg, dd->in_sg_len, DMA_TO_DEVICE);
 388                 if (dd->out_sg_len)
 389                         dma_unmap_sg(dd->dev, dd->out_sg, dd->out_sg_len,
 390                                      DMA_FROM_DEVICE);
 391         }
 392
 393         return err;
 394 }
 395
 396 static void omap_aes_finish_req(struct omap_aes_dev *dd, int err)
 397 {
 398         struct skcipher_request *req = dd->req;
 399
 400         pr_debug("err: %d\n", err);
 401
 402         crypto_finalize_skcipher_request(dd->engine, req, err);
 403
 404         pm_runtime_mark_last_busy(dd->dev);
 405         pm_runtime_put_autosuspend(dd->dev);
 406 }
 407
 408 int omap_aes_crypt_dma_stop(struct omap_aes_dev *dd)
 409 {
 410         pr_debug("total: %zu\n", dd->total);
 411
 412         omap_aes_dma_stop(dd);
 413
 414
 415         return 0;
 416 }
 417
 418 static int omap_aes_handle_queue(struct omap_aes_dev *dd,
 419                                  struct skcipher_request *req)
 420 {
 421         if (req)
 422                 return crypto_transfer_skcipher_request_to_engine(dd->engine, req);
 423
 424         return 0;
 425 }
 426
 427 static int omap_aes_prepare_req(struct skcipher_request *req,
 428                                 struct omap_aes_dev *dd)
 429 {
 430         struct omap_aes_ctx *ctx = crypto_skcipher_ctx(
 431                         crypto_skcipher_reqtfm(req));
 432         struct omap_aes_reqctx *rctx = skcipher_request_ctx(req);
 433         int ret;
 434         u16 flags;
 435
 436         /* assign new request to device */
 437         dd->req = req;
 438         dd->total = req->cryptlen;
 439         dd->total_save = req->cryptlen;
 440         dd->in_sg = req->src;
 441         dd->out_sg = req->dst;
 442         dd->orig_out = req->dst;
 443
 444         flags = OMAP_CRYPTO_COPY_DATA;
 445         if (req->src == req->dst)
 446                 flags |= OMAP_CRYPTO_FORCE_COPY;
 447
 448         ret = omap_crypto_align_sg(&dd->in_sg, dd->total, AES_BLOCK_SIZE,
 449                                    dd->in_sgl, flags,
 450                                    FLAGS_IN_DATA_ST_SHIFT, &dd->flags);
 451         if (ret)
 452                 return ret;
 453
 454         ret = omap_crypto_align_sg(&dd->out_sg, dd->total, AES_BLOCK_SIZE,
 455                                    &dd->out_sgl, 0,
 456                                    FLAGS_OUT_DATA_ST_SHIFT, &dd->flags);
 457         if (ret)
 458                 return ret;
 459
 460         dd->in_sg_len = sg_nents_for_len(dd->in_sg, dd->total);
 461         if (dd->in_sg_len < 0)
 462                 return dd->in_sg_len;
 463
 464         dd->out_sg_len = sg_nents_for_len(dd->out_sg, dd->total);
 465         if (dd->out_sg_len < 0)
 466                 return dd->out_sg_len;
 467
 468         rctx->mode &= FLAGS_MODE_MASK;
 469         dd->flags = (dd->flags & ~FLAGS_MODE_MASK) | rctx->mode;
 470
 471         dd->ctx = ctx;
 472         rctx->dd = dd;
 473
 474         return omap_aes_write_ctrl(dd);
 475 }
 476
 477 static int omap_aes_crypt_req(struct crypto_engine *engine,
 478                               void *areq)
 479 {
 480         struct skcipher_request *req = container_of(areq, struct skcipher_request, base);
 481         struct omap_aes_reqctx *rctx = skcipher_request_ctx(req);
 482         struct omap_aes_dev *dd = rctx->dd;
 483
 484         if (!dd)
 485                 return -ENODEV;
 486
 487         return omap_aes_prepare_req(req, dd) ?:
 488                omap_aes_crypt_dma_start(dd);
 489 }
 490
 491 static void omap_aes_copy_ivout(struct omap_aes_dev *dd, u8 *ivbuf)
 492 {
 493         int i;
 494
 495         for (i = 0; i < 4; i++)
 496                 ((u32 *)ivbuf)[i] = omap_aes_read(dd, AES_REG_IV(dd, i));
 497 }
 498
 499 static void omap_aes_done_task(unsigned long data)
 500 {
 501         struct omap_aes_dev *dd = (struct omap_aes_dev *)data;
 502
 503         pr_debug("enter done_task\n");
 504
 505         if (!dd->pio_only) {
 506                 dma_sync_sg_for_device(dd->dev, dd->out_sg, dd->out_sg_len,
 507                                        DMA_FROM_DEVICE);
 508                 dma_unmap_sg(dd->dev, dd->in_sg, dd->in_sg_len, DMA_TO_DEVICE);
 509                 dma_unmap_sg(dd->dev, dd->out_sg, dd->out_sg_len,
 510                              DMA_FROM_DEVICE);
 511                 omap_aes_crypt_dma_stop(dd);
 512         }
 513
 514         omap_crypto_cleanup(dd->in_sg, NULL, 0, dd->total_save,
 515                             FLAGS_IN_DATA_ST_SHIFT, dd->flags);
 516
 517         omap_crypto_cleanup(dd->out_sg, dd->orig_out, 0, dd->total_save,
 518                             FLAGS_OUT_DATA_ST_SHIFT, dd->flags);
 519
 520         /* Update IV output */
 521         if (dd->flags & (FLAGS_CBC | FLAGS_CTR))
 522                 omap_aes_copy_ivout(dd, dd->req->iv);
 523
 524         omap_aes_finish_req(dd, 0);
 525
 526         pr_debug("exit\n");
 527 }
 528
 529 static int omap_aes_crypt(struct skcipher_request *req, unsigned long mode)
 530 {
 531         struct omap_aes_ctx *ctx = crypto_skcipher_ctx(
 532                         crypto_skcipher_reqtfm(req));
 533         struct omap_aes_reqctx *rctx = skcipher_request_ctx(req);
 534         struct omap_aes_dev *dd;
 535         int ret;
 536
 537         if ((req->cryptlen % AES_BLOCK_SIZE) && !(mode & FLAGS_CTR))
 538                 return -EINVAL;
 539
 540         pr_debug("nbytes: %d, enc: %d, cbc: %d\n", req->cryptlen,
 541                   !!(mode & FLAGS_ENCRYPT),
 542                   !!(mode & FLAGS_CBC));
 543
 544         if (req->cryptlen < aes_fallback_sz) {
 545                 skcipher_request_set_tfm(&rctx->fallback_req, ctx->fallback);
 546                 skcipher_request_set_callback(&rctx->fallback_req,
 547                                               req->base.flags,
 548                                               req->base.complete,
 549                                               req->base.data);
 550                 skcipher_request_set_crypt(&rctx->fallback_req, req->src,
 551                                            req->dst, req->cryptlen, req->iv);
 552
 553                 if (mode & FLAGS_ENCRYPT)
 554                         ret = crypto_skcipher_encrypt(&rctx->fallback_req);
 555                 else
 556                         ret = crypto_skcipher_decrypt(&rctx->fallback_req);
 557                 return ret;
 558         }
 559         dd = omap_aes_find_dev(rctx);
 560         if (!dd)
 561                 return -ENODEV;
 562
 563         rctx->mode = mode;
 564
 565         return omap_aes_handle_queue(dd, req);
 566 }
 567
 568 /* ********************** ALG API ************************************ */
 569
 570 static int omap_aes_setkey(struct crypto_skcipher *tfm, const u8 *key,
 571                            unsigned int keylen)
 572 {
 573         struct omap_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
 574         int ret;
 575
 576         if (keylen != AES_KEYSIZE_128 && keylen != AES_KEYSIZE_192 &&
 577                    keylen != AES_KEYSIZE_256)
 578                 return -EINVAL;
 579
 580         pr_debug("enter, keylen: %d\n", keylen);
 581
 582         memcpy(ctx->key, key, keylen);
 583         ctx->keylen = keylen;
 584
 585         crypto_skcipher_clear_flags(ctx->fallback, CRYPTO_TFM_REQ_MASK);
 586         crypto_skcipher_set_flags(ctx->fallback, tfm->base.crt_flags &
 587                                                  CRYPTO_TFM_REQ_MASK);
 588
 589         ret = crypto_skcipher_setkey(ctx->fallback, key, keylen);
 590         if (!ret)
 591                 return 0;
 592
 593         return 0;
 594 }
 595
 596 static int omap_aes_ecb_encrypt(struct skcipher_request *req)
 597 {
 598         return omap_aes_crypt(req, FLAGS_ENCRYPT);
 599 }
 600
 601 static int omap_aes_ecb_decrypt(struct skcipher_request *req)
 602 {
 603         return omap_aes_crypt(req, 0);
 604 }
 605
 606 static int omap_aes_cbc_encrypt(struct skcipher_request *req)
 607 {
 608         return omap_aes_crypt(req, FLAGS_ENCRYPT | FLAGS_CBC);
 609 }
 610
 611 static int omap_aes_cbc_decrypt(struct skcipher_request *req)
 612 {
 613         return omap_aes_crypt(req, FLAGS_CBC);
 614 }
 615
 616 static int omap_aes_ctr_encrypt(struct skcipher_request *req)
 617 {
 618         return omap_aes_crypt(req, FLAGS_ENCRYPT | FLAGS_CTR);
 619 }
 620
 621 static int omap_aes_ctr_decrypt(struct skcipher_request *req)
 622 {
 623         return omap_aes_crypt(req, FLAGS_CTR);
 624 }
 625
 626 static int omap_aes_init_tfm(struct crypto_skcipher *tfm)
 627 {
 628         const char *name = crypto_tfm_alg_name(&tfm->base);
 629         struct omap_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
 630         struct crypto_skcipher *blk;
 631
 632         blk = crypto_alloc_skcipher(name, 0, CRYPTO_ALG_NEED_FALLBACK);
 633         if (IS_ERR(blk))
 634                 return PTR_ERR(blk);
 635
 636         ctx->fallback = blk;
 637
 638         crypto_skcipher_set_reqsize(tfm, sizeof(struct omap_aes_reqctx) +
 639                                          crypto_skcipher_reqsize(blk));
 640
 641         return 0;
 642 }
 643
 644 static void omap_aes_exit_tfm(struct crypto_skcipher *tfm)
 645 {
 646         struct omap_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
 647
 648         if (ctx->fallback)
 649                 crypto_free_skcipher(ctx->fallback);
 650
 651         ctx->fallback = NULL;
 652 }
 653
 654 /* ********************** ALGS ************************************ */
 655
 656 static struct skcipher_engine_alg algs_ecb_cbc[] = {
 657 {
 658         .base = {
 659                 .base.cra_name          = "ecb(aes)",
 660                 .base.cra_driver_name   = "ecb-aes-omap",
 661                 .base.cra_priority      = 300,
 662                 .base.cra_flags         = CRYPTO_ALG_KERN_DRIVER_ONLY |
 663                                           CRYPTO_ALG_ASYNC |
 664                                           CRYPTO_ALG_NEED_FALLBACK,
 665                 .base.cra_blocksize     = AES_BLOCK_SIZE,
 666                 .base.cra_ctxsize       = sizeof(struct omap_aes_ctx),
 667                 .base.cra_module        = THIS_MODULE,
 668
 669                 .min_keysize            = AES_MIN_KEY_SIZE,
 670                 .max_keysize            = AES_MAX_KEY_SIZE,
 671                 .setkey                 = omap_aes_setkey,
 672                 .encrypt                = omap_aes_ecb_encrypt,
 673                 .decrypt                = omap_aes_ecb_decrypt,
 674                 .init                   = omap_aes_init_tfm,
 675                 .exit                   = omap_aes_exit_tfm,
 676         },
 677         .op.do_one_request = omap_aes_crypt_req,
 678 },
 679 {
 680         .base = {
 681                 .base.cra_name          = "cbc(aes)",
 682                 .base.cra_driver_name   = "cbc-aes-omap",
 683                 .base.cra_priority      = 300,
 684                 .base.cra_flags         = CRYPTO_ALG_KERN_DRIVER_ONLY |
 685                                           CRYPTO_ALG_ASYNC |
 686                                           CRYPTO_ALG_NEED_FALLBACK,
 687                 .base.cra_blocksize     = AES_BLOCK_SIZE,
 688                 .base.cra_ctxsize       = sizeof(struct omap_aes_ctx),
 689                 .base.cra_module        = THIS_MODULE,
 690
 691                 .min_keysize            = AES_MIN_KEY_SIZE,
 692                 .max_keysize            = AES_MAX_KEY_SIZE,
 693                 .ivsize                 = AES_BLOCK_SIZE,
 694                 .setkey                 = omap_aes_setkey,
 695                 .encrypt                = omap_aes_cbc_encrypt,
 696                 .decrypt                = omap_aes_cbc_decrypt,
 697                 .init                   = omap_aes_init_tfm,
 698                 .exit                   = omap_aes_exit_tfm,
 699         },
 700         .op.do_one_request = omap_aes_crypt_req,
 701 }
 702 };
 703
 704 static struct skcipher_engine_alg algs_ctr[] = {
 705 {
 706         .base = {
 707                 .base.cra_name          = "ctr(aes)",
 708                 .base.cra_driver_name   = "ctr-aes-omap",
 709                 .base.cra_priority      = 300,
 710                 .base.cra_flags         = CRYPTO_ALG_KERN_DRIVER_ONLY |
 711                                           CRYPTO_ALG_ASYNC |
 712                                           CRYPTO_ALG_NEED_FALLBACK,
 713                 .base.cra_blocksize     = 1,
 714                 .base.cra_ctxsize       = sizeof(struct omap_aes_ctx),
 715                 .base.cra_module        = THIS_MODULE,
 716
 717                 .min_keysize            = AES_MIN_KEY_SIZE,
 718                 .max_keysize            = AES_MAX_KEY_SIZE,
 719                 .ivsize                 = AES_BLOCK_SIZE,
 720                 .setkey                 = omap_aes_setkey,
 721                 .encrypt                = omap_aes_ctr_encrypt,
 722                 .decrypt                = omap_aes_ctr_decrypt,
 723                 .init                   = omap_aes_init_tfm,
 724                 .exit                   = omap_aes_exit_tfm,
 725         },
 726         .op.do_one_request = omap_aes_crypt_req,
 727 }
 728 };
 729
 730 static struct omap_aes_algs_info omap_aes_algs_info_ecb_cbc[] = {
 731         {
 732                 .algs_list      = algs_ecb_cbc,
 733                 .size           = ARRAY_SIZE(algs_ecb_cbc),
 734         },
 735 };
 736
 737 static struct aead_engine_alg algs_aead_gcm[] = {
 738 {
 739         .base = {
 740                 .base = {
 741                         .cra_name               = "gcm(aes)",
 742                         .cra_driver_name        = "gcm-aes-omap",
 743                         .cra_priority           = 300,
 744                         .cra_flags              = CRYPTO_ALG_ASYNC |
 745                                                   CRYPTO_ALG_KERN_DRIVER_ONLY,
 746                         .cra_blocksize          = 1,
 747                         .cra_ctxsize            = sizeof(struct omap_aes_gcm_ctx),
 748                         .cra_alignmask          = 0xf,
 749                         .cra_module             = THIS_MODULE,
 750                 },
 751                 .init           = omap_aes_gcm_cra_init,
 752                 .ivsize         = GCM_AES_IV_SIZE,
 753                 .maxauthsize    = AES_BLOCK_SIZE,
 754                 .setkey         = omap_aes_gcm_setkey,
 755                 .setauthsize    = omap_aes_gcm_setauthsize,
 756                 .encrypt        = omap_aes_gcm_encrypt,
 757                 .decrypt        = omap_aes_gcm_decrypt,
 758         },
 759         .op.do_one_request = omap_aes_gcm_crypt_req,
 760 },
 761 {
 762         .base = {
 763                 .base = {
 764                         .cra_name               = "rfc4106(gcm(aes))",
 765                         .cra_driver_name        = "rfc4106-gcm-aes-omap",
 766                         .cra_priority           = 300,
 767                         .cra_flags              = CRYPTO_ALG_ASYNC |
 768                                                   CRYPTO_ALG_KERN_DRIVER_ONLY,
 769                         .cra_blocksize          = 1,
 770                         .cra_ctxsize            = sizeof(struct omap_aes_gcm_ctx),
 771                         .cra_alignmask          = 0xf,
 772                         .cra_module             = THIS_MODULE,
 773                 },
 774                 .init           = omap_aes_gcm_cra_init,
 775                 .maxauthsize    = AES_BLOCK_SIZE,
 776                 .ivsize         = GCM_RFC4106_IV_SIZE,
 777                 .setkey         = omap_aes_4106gcm_setkey,
 778                 .setauthsize    = omap_aes_4106gcm_setauthsize,
 779                 .encrypt        = omap_aes_4106gcm_encrypt,
 780                 .decrypt        = omap_aes_4106gcm_decrypt,
 781         },
 782         .op.do_one_request = omap_aes_gcm_crypt_req,
 783 },
 784 };
 785
 786 static struct omap_aes_aead_algs omap_aes_aead_info = {
 787         .algs_list      =       algs_aead_gcm,
 788         .size           =       ARRAY_SIZE(algs_aead_gcm),
 789 };
 790
 791 static const struct omap_aes_pdata omap_aes_pdata_omap2 = {
 792         .algs_info      = omap_aes_algs_info_ecb_cbc,
 793         .algs_info_size = ARRAY_SIZE(omap_aes_algs_info_ecb_cbc),
 794         .trigger        = omap_aes_dma_trigger_omap2,
 795         .key_ofs        = 0x1c,
 796         .iv_ofs         = 0x20,
 797         .ctrl_ofs       = 0x30,
 798         .data_ofs       = 0x34,
 799         .rev_ofs        = 0x44,
 800         .mask_ofs       = 0x48,
 801         .dma_enable_in  = BIT(2),
 802         .dma_enable_out = BIT(3),
 803         .dma_start      = BIT(5),
 804         .major_mask     = 0xf0,
 805         .major_shift    = 4,
 806         .minor_mask     = 0x0f,
 807         .minor_shift    = 0,
 808 };
 809
 810 #ifdef CONFIG_OF
 811 static struct omap_aes_algs_info omap_aes_algs_info_ecb_cbc_ctr[] = {
 812         {
 813                 .algs_list      = algs_ecb_cbc,
 814                 .size           = ARRAY_SIZE(algs_ecb_cbc),
 815         },
 816         {
 817                 .algs_list      = algs_ctr,
 818                 .size           = ARRAY_SIZE(algs_ctr),
 819         },
 820 };
 821
 822 static const struct omap_aes_pdata omap_aes_pdata_omap3 = {
 823         .algs_info      = omap_aes_algs_info_ecb_cbc_ctr,
 824         .algs_info_size = ARRAY_SIZE(omap_aes_algs_info_ecb_cbc_ctr),
 825         .trigger        = omap_aes_dma_trigger_omap2,
 826         .key_ofs        = 0x1c,
 827         .iv_ofs         = 0x20,
 828         .ctrl_ofs       = 0x30,
 829         .data_ofs       = 0x34,
 830         .rev_ofs        = 0x44,
 831         .mask_ofs       = 0x48,
 832         .dma_enable_in  = BIT(2),
 833         .dma_enable_out = BIT(3),
 834         .dma_start      = BIT(5),
 835         .major_mask     = 0xf0,
 836         .major_shift    = 4,
 837         .minor_mask     = 0x0f,
 838         .minor_shift    = 0,
 839 };
 840
 841 static const struct omap_aes_pdata omap_aes_pdata_omap4 = {
 842         .algs_info      = omap_aes_algs_info_ecb_cbc_ctr,
 843         .algs_info_size = ARRAY_SIZE(omap_aes_algs_info_ecb_cbc_ctr),
 844         .aead_algs_info = &omap_aes_aead_info,
 845         .trigger        = omap_aes_dma_trigger_omap4,
 846         .key_ofs        = 0x3c,
 847         .iv_ofs         = 0x40,
 848         .ctrl_ofs       = 0x50,
 849         .data_ofs       = 0x60,
 850         .rev_ofs        = 0x80,
 851         .mask_ofs       = 0x84,
 852         .irq_status_ofs = 0x8c,
 853         .irq_enable_ofs = 0x90,
 854         .dma_enable_in  = BIT(5),
 855         .dma_enable_out = BIT(6),
 856         .major_mask     = 0x0700,
 857         .major_shift    = 8,
 858         .minor_mask     = 0x003f,
 859         .minor_shift    = 0,
 860 };
 861
 862 static irqreturn_t omap_aes_irq(int irq, void *dev_id)
 863 {
 864         struct omap_aes_dev *dd = dev_id;
 865         u32 status, i;
 866         u32 *src, *dst;
 867
 868         status = omap_aes_read(dd, AES_REG_IRQ_STATUS(dd));
 869         if (status & AES_REG_IRQ_DATA_IN) {
 870                 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x0);
 871
 872                 BUG_ON(!dd->in_sg);
 873
 874                 BUG_ON(_calc_walked(in) > dd->in_sg->length);
 875
 876                 src = sg_virt(dd->in_sg) + _calc_walked(in);
 877
 878                 for (i = 0; i < AES_BLOCK_WORDS; i++) {
 879                         omap_aes_write(dd, AES_REG_DATA_N(dd, i), *src);
 880
 881                         scatterwalk_advance(&dd->in_walk, 4);
 882                         if (dd->in_sg->length == _calc_walked(in)) {
 883                                 dd->in_sg = sg_next(dd->in_sg);
 884                                 if (dd->in_sg) {
 885                                         scatterwalk_start(&dd->in_walk,
 886                                                           dd->in_sg);
 887                                         src = sg_virt(dd->in_sg) +
 888                                               _calc_walked(in);
 889                                 }
 890                         } else {
 891                                 src++;
 892                         }
 893                 }
 894
 895                 /* Clear IRQ status */
 896                 status &= ~AES_REG_IRQ_DATA_IN;
 897                 omap_aes_write(dd, AES_REG_IRQ_STATUS(dd), status);
 898
 899                 /* Enable DATA_OUT interrupt */
 900                 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x4);
 901
 902         } else if (status & AES_REG_IRQ_DATA_OUT) {
 903                 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x0);
 904
 905                 BUG_ON(!dd->out_sg);
 906
 907                 BUG_ON(_calc_walked(out) > dd->out_sg->length);
 908
 909                 dst = sg_virt(dd->out_sg) + _calc_walked(out);
 910
 911                 for (i = 0; i < AES_BLOCK_WORDS; i++) {
 912                         *dst = omap_aes_read(dd, AES_REG_DATA_N(dd, i));
 913                         scatterwalk_advance(&dd->out_walk, 4);
 914                         if (dd->out_sg->length == _calc_walked(out)) {
 915                                 dd->out_sg = sg_next(dd->out_sg);
 916                                 if (dd->out_sg) {
 917                                         scatterwalk_start(&dd->out_walk,
 918                                                           dd->out_sg);
 919                                         dst = sg_virt(dd->out_sg) +
 920                                               _calc_walked(out);
 921                                 }
 922                         } else {
 923                                 dst++;
 924                         }
 925                 }
 926
 927                 dd->total -= min_t(size_t, AES_BLOCK_SIZE, dd->total);
 928
 929                 /* Clear IRQ status */
 930                 status &= ~AES_REG_IRQ_DATA_OUT;
 931                 omap_aes_write(dd, AES_REG_IRQ_STATUS(dd), status);
 932
 933                 if (!dd->total)
 934                         /* All bytes read! */
 935                         tasklet_schedule(&dd->done_task);
 936                 else
 937                         /* Enable DATA_IN interrupt for next block */
 938                         omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x2);
 939         }
 940
 941         return IRQ_HANDLED;
 942 }
 943
 944 static const struct of_device_id omap_aes_of_match[] = {
 945         {
 946                 .compatible     = "ti,omap2-aes",
 947                 .data           = &omap_aes_pdata_omap2,
 948         },
 949         {
 950                 .compatible     = "ti,omap3-aes",
 951                 .data           = &omap_aes_pdata_omap3,
 952         },
 953         {
 954                 .compatible     = "ti,omap4-aes",
 955                 .data           = &omap_aes_pdata_omap4,
 956         },
 957         {},
 958 };
 959 MODULE_DEVICE_TABLE(of, omap_aes_of_match);
 960
 961 static int omap_aes_get_res_of(struct omap_aes_dev *dd,
 962                 struct device *dev, struct resource *res)
 963 {
 964         struct device_node *node = dev->of_node;
 965         int err = 0;
 966
 967         dd->pdata = of_device_get_match_data(dev);
 968         if (!dd->pdata) {
 969                 dev_err(dev, "no compatible OF match\n");
 970                 err = -EINVAL;
 971                 goto err;
 972         }
 973
 974         err = of_address_to_resource(node, 0, res);
 975         if (err < 0) {
 976                 dev_err(dev, "can't translate OF node address\n");
 977                 err = -EINVAL;
 978                 goto err;
 979         }
 980
 981 err:
 982         return err;
 983 }
 984 #else
 985 static const struct of_device_id omap_aes_of_match[] = {
 986         {},
 987 };
 988
 989 static int omap_aes_get_res_of(struct omap_aes_dev *dd,
 990                 struct device *dev, struct resource *res)
 991 {
 992         return -EINVAL;
 993 }
 994 #endif
 995
 996 static int omap_aes_get_res_pdev(struct omap_aes_dev *dd,
 997                 struct platform_device *pdev, struct resource *res)
 998 {
 999         struct device *dev = &pdev->dev;
1000         struct resource *r;
1001         int err = 0;
1002
1003         /* Get the base address */
1004         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1005         if (!r) {
1006                 dev_err(dev, "no MEM resource info\n");
1007                 err = -ENODEV;
1008                 goto err;
1009         }
1010         memcpy(res, r, sizeof(*res));
1011
1012         /* Only OMAP2/3 can be non-DT */
1013         dd->pdata = &omap_aes_pdata_omap2;
1014
1015 err:
1016         return err;
1017 }
1018
1019 static ssize_t fallback_show(struct device *dev, struct device_attribute *attr,
1020                              char *buf)
1021 {
1022         return sprintf(buf, "%d\n", aes_fallback_sz);
1023 }
1024
1025 static ssize_t fallback_store(struct device *dev, struct device_attribute *attr,
1026                               const char *buf, size_t size)
1027 {
1028         ssize_t status;
1029         long value;
1030
1031         status = kstrtol(buf, 0, &value);
1032         if (status)
1033                 return status;
1034
1035         /* HW accelerator only works with buffers > 9 */
1036         if (value < 9) {
1037                 dev_err(dev, "minimum fallback size 9\n");
1038                 return -EINVAL;
1039         }
1040
1041         aes_fallback_sz = value;
1042
1043         return size;
1044 }
1045
1046 static ssize_t queue_len_show(struct device *dev, struct device_attribute *attr,
1047                               char *buf)
1048 {
1049         struct omap_aes_dev *dd = dev_get_drvdata(dev);
1050
1051         return sprintf(buf, "%d\n", dd->engine->queue.max_qlen);
1052 }
1053
1054 static ssize_t queue_len_store(struct device *dev,
1055                                struct device_attribute *attr, const char *buf,
1056                                size_t size)
1057 {
1058         struct omap_aes_dev *dd;
1059         ssize_t status;
1060         long value;
1061         unsigned long flags;
1062
1063         status = kstrtol(buf, 0, &value);
1064         if (status)
1065                 return status;
1066
1067         if (value < 1)
1068                 return -EINVAL;
1069
1070         /*
1071          * Changing the queue size in fly is safe, if size becomes smaller
1072          * than current size, it will just not accept new entries until
1073          * it has shrank enough.
1074          */
1075         spin_lock_bh(&list_lock);
1076         list_for_each_entry(dd, &dev_list, list) {
1077                 spin_lock_irqsave(&dd->lock, flags);
1078                 dd->engine->queue.max_qlen = value;
1079                 dd->aead_queue.base.max_qlen = value;
1080                 spin_unlock_irqrestore(&dd->lock, flags);
1081         }
1082         spin_unlock_bh(&list_lock);
1083
1084         return size;
1085 }
1086
1087 static DEVICE_ATTR_RW(queue_len);
1088 static DEVICE_ATTR_RW(fallback);
1089
1090 static struct attribute *omap_aes_attrs[] = {
1091         &dev_attr_queue_len.attr,
1092         &dev_attr_fallback.attr,
1093         NULL,
1094 };
1095
1096 static const struct attribute_group omap_aes_attr_group = {
1097         .attrs = omap_aes_attrs,
1098 };
1099
1100 static int omap_aes_probe(struct platform_device *pdev)
1101 {
1102         struct device *dev = &pdev->dev;
1103         struct omap_aes_dev *dd;
1104         struct skcipher_engine_alg *algp;
1105         struct aead_engine_alg *aalg;
1106         struct resource res;
1107         int err = -ENOMEM, i, j, irq = -1;
1108         u32 reg;
1109
1110         dd = devm_kzalloc(dev, sizeof(struct omap_aes_dev), GFP_KERNEL);
1111         if (dd == NULL) {
1112                 dev_err(dev, "unable to alloc data struct.\n");
1113                 goto err_data;
1114         }
1115         dd->dev = dev;
1116         platform_set_drvdata(pdev, dd);
1117
1118         aead_init_queue(&dd->aead_queue, OMAP_AES_QUEUE_LENGTH);
1119
1120         err = (dev->of_node) ? omap_aes_get_res_of(dd, dev, &res) :
1121                                omap_aes_get_res_pdev(dd, pdev, &res);
1122         if (err)
1123                 goto err_res;
1124
1125         dd->io_base = devm_ioremap_resource(dev, &res);
1126         if (IS_ERR(dd->io_base)) {
1127                 err = PTR_ERR(dd->io_base);
1128                 goto err_res;
1129         }
1130         dd->phys_base = res.start;
1131
1132         pm_runtime_use_autosuspend(dev);
1133         pm_runtime_set_autosuspend_delay(dev, DEFAULT_AUTOSUSPEND_DELAY);
1134
1135         pm_runtime_enable(dev);
1136         err = pm_runtime_resume_and_get(dev);
1137         if (err < 0) {
1138                 dev_err(dev, "%s: failed to get_sync(%d)\n",
1139                         __func__, err);
1140                 goto err_pm_disable;
1141         }
1142
1143         omap_aes_dma_stop(dd);
1144
1145         reg = omap_aes_read(dd, AES_REG_REV(dd));
1146
1147         pm_runtime_put_sync(dev);
1148
1149         dev_info(dev, "OMAP AES hw accel rev: %u.%u\n",
1150                  (reg & dd->pdata->major_mask) >> dd->pdata->major_shift,
1151                  (reg & dd->pdata->minor_mask) >> dd->pdata->minor_shift);
1152
1153         tasklet_init(&dd->done_task, omap_aes_done_task, (unsigned long)dd);
1154
1155         err = omap_aes_dma_init(dd);
1156         if (err == -EPROBE_DEFER) {
1157                 goto err_irq;
1158         } else if (err && AES_REG_IRQ_STATUS(dd) && AES_REG_IRQ_ENABLE(dd)) {
1159                 dd->pio_only = 1;
1160
1161                 irq = platform_get_irq(pdev, 0);
1162                 if (irq < 0) {
1163                         err = irq;
1164                         goto err_irq;
1165                 }
1166
1167                 err = devm_request_irq(dev, irq, omap_aes_irq, 0,
1168                                 dev_name(dev), dd);
1169                 if (err) {
1170                         dev_err(dev, "Unable to grab omap-aes IRQ\n");
1171                         goto err_irq;
1172                 }
1173         }
1174
1175         spin_lock_init(&dd->lock);
1176
1177         INIT_LIST_HEAD(&dd->list);
1178         spin_lock_bh(&list_lock);
1179         list_add_tail(&dd->list, &dev_list);
1180         spin_unlock_bh(&list_lock);
1181
1182         /* Initialize crypto engine */
1183         dd->engine = crypto_engine_alloc_init(dev, 1);
1184         if (!dd->engine) {
1185                 err = -ENOMEM;
1186                 goto err_engine;
1187         }
1188
1189         err = crypto_engine_start(dd->engine);
1190         if (err)
1191                 goto err_engine;
1192
1193         for (i = 0; i < dd->pdata->algs_info_size; i++) {
1194                 if (!dd->pdata->algs_info[i].registered) {
1195                         for (j = 0; j < dd->pdata->algs_info[i].size; j++) {
1196                                 algp = &dd->pdata->algs_info[i].algs_list[j];
1197
1198                                 pr_debug("reg alg: %s\n", algp->base.base.cra_name);
1199
1200                                 err = crypto_engine_register_skcipher(algp);
1201                                 if (err)
1202                                         goto err_algs;
1203
1204                                 dd->pdata->algs_info[i].registered++;
1205                         }
1206                 }
1207         }
1208
1209         if (dd->pdata->aead_algs_info &&
1210             !dd->pdata->aead_algs_info->registered) {
1211                 for (i = 0; i < dd->pdata->aead_algs_info->size; i++) {
1212                         aalg = &dd->pdata->aead_algs_info->algs_list[i];
1213
1214                         pr_debug("reg alg: %s\n", aalg->base.base.cra_name);
1215
1216                         err = crypto_engine_register_aead(aalg);
1217                         if (err)
1218                                 goto err_aead_algs;
1219
1220                         dd->pdata->aead_algs_info->registered++;
1221                 }
1222         }
1223
1224         err = sysfs_create_group(&dev->kobj, &omap_aes_attr_group);
1225         if (err) {
1226                 dev_err(dev, "could not create sysfs device attrs\n");
1227                 goto err_aead_algs;
1228         }
1229
1230         return 0;
1231 err_aead_algs:
1232         for (i = dd->pdata->aead_algs_info->registered - 1; i >= 0; i--) {
1233                 aalg = &dd->pdata->aead_algs_info->algs_list[i];
1234                 crypto_engine_unregister_aead(aalg);
1235         }
1236 err_algs:
1237         for (i = dd->pdata->algs_info_size - 1; i >= 0; i--)
1238                 for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--)
1239                         crypto_engine_unregister_skcipher(
1240                                         &dd->pdata->algs_info[i].algs_list[j]);
1241
1242 err_engine:
1243         if (dd->engine)
1244                 crypto_engine_exit(dd->engine);
1245
1246         omap_aes_dma_cleanup(dd);
1247 err_irq:
1248         tasklet_kill(&dd->done_task);
1249 err_pm_disable:
1250         pm_runtime_disable(dev);
1251 err_res:
1252         dd = NULL;
1253 err_data:
1254         dev_err(dev, "initialization failed.\n");
1255         return err;
1256 }
1257
1258 static int omap_aes_remove(struct platform_device *pdev)
1259 {
1260         struct omap_aes_dev *dd = platform_get_drvdata(pdev);
1261         struct aead_engine_alg *aalg;
1262         int i, j;
1263
1264         spin_lock_bh(&list_lock);
1265         list_del(&dd->list);
1266         spin_unlock_bh(&list_lock);
1267
1268         for (i = dd->pdata->algs_info_size - 1; i >= 0; i--)
1269                 for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--) {
1270                         crypto_engine_unregister_skcipher(
1271                                         &dd->pdata->algs_info[i].algs_list[j]);
1272                         dd->pdata->algs_info[i].registered--;
1273                 }
1274
1275         for (i = dd->pdata->aead_algs_info->registered - 1; i >= 0; i--) {
1276                 aalg = &dd->pdata->aead_algs_info->algs_list[i];
1277                 crypto_engine_unregister_aead(aalg);
1278                 dd->pdata->aead_algs_info->registered--;
1279         }
1280
1281         crypto_engine_exit(dd->engine);
1282
1283         tasklet_kill(&dd->done_task);
1284         omap_aes_dma_cleanup(dd);
1285         pm_runtime_disable(dd->dev);
1286
1287         sysfs_remove_group(&dd->dev->kobj, &omap_aes_attr_group);
1288
1289         return 0;
1290 }
1291
1292 #ifdef CONFIG_PM_SLEEP
1293 static int omap_aes_suspend(struct device *dev)
1294 {
1295         pm_runtime_put_sync(dev);
1296         return 0;
1297 }
1298
1299 static int omap_aes_resume(struct device *dev)
1300 {
1301         pm_runtime_get_sync(dev);
1302         return 0;
1303 }
1304 #endif
1305
1306 static SIMPLE_DEV_PM_OPS(omap_aes_pm_ops, omap_aes_suspend, omap_aes_resume);
1307
1308 static struct platform_driver omap_aes_driver = {
1309         .probe  = omap_aes_probe,
1310         .remove = omap_aes_remove,
1311         .driver = {
1312                 .name   = "omap-aes",
1313                 .pm     = &omap_aes_pm_ops,
1314                 .of_match_table = omap_aes_of_match,
1315         },
1316 };
1317
1318 module_platform_driver(omap_aes_driver);
1319
1320 MODULE_DESCRIPTION("OMAP AES hw acceleration support.");
1321 MODULE_LICENSE("GPL v2");
1322 MODULE_AUTHOR("Dmitry Kasatkin");
1323