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 <linux/err.h>
  17 #include <linux/module.h>
  18 #include <linux/init.h>
  19 #include <linux/errno.h>
  20 #include <linux/kernel.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/scatterlist.h>
  23 #include <linux/dma-mapping.h>
  24 #include <linux/dmaengine.h>
  25 #include <linux/pm_runtime.h>
  26 #include <linux/of.h>
  27 #include <linux/of_device.h>
  28 #include <linux/of_address.h>
  29 #include <linux/io.h>
  30 #include <linux/crypto.h>
  31 #include <linux/interrupt.h>
  32 #include <crypto/scatterwalk.h>
  33 #include <crypto/aes.h>
  34 #include <crypto/gcm.h>
  35 #include <crypto/engine.h>
  36 #include <crypto/internal/skcipher.h>
  37 #include <crypto/internal/aead.h>
  38
  39 #include "omap-crypto.h"
  40 #include "omap-aes.h"
  41
  42 /* keep registered devices data here */
  43 static LIST_HEAD(dev_list);
  44 static DEFINE_SPINLOCK(list_lock);
  45
  46 static int aes_fallback_sz = 200;
  47
  48 #ifdef DEBUG
  49 #define omap_aes_read(dd, offset)                               \
  50 ({                                                              \
  51         int _read_ret;                                          \
  52         _read_ret = __raw_readl(dd->io_base + offset);          \
  53         pr_debug("omap_aes_read(" #offset "=%#x)= %#x\n",       \
  54                  offset, _read_ret);                            \
  55         _read_ret;                                              \
  56 })
  57 #else
  58 inline u32 omap_aes_read(struct omap_aes_dev *dd, u32 offset)
  59 {
  60         return __raw_readl(dd->io_base + offset);
  61 }
  62 #endif
  63
  64 #ifdef DEBUG
  65 #define omap_aes_write(dd, offset, value)                               \
  66         do {                                                            \
  67                 pr_debug("omap_aes_write(" #offset "=%#x) value=%#x\n", \
  68                          offset, value);                                \
  69                 __raw_writel(value, dd->io_base + offset);              \
  70         } while (0)
  71 #else
  72 inline void omap_aes_write(struct omap_aes_dev *dd, u32 offset,
  73                                   u32 value)
  74 {
  75         __raw_writel(value, dd->io_base + offset);
  76 }
  77 #endif
  78
  79 static inline void omap_aes_write_mask(struct omap_aes_dev *dd, u32 offset,
  80                                         u32 value, u32 mask)
  81 {
  82         u32 val;
  83
  84         val = omap_aes_read(dd, offset);
  85         val &= ~mask;
  86         val |= value;
  87         omap_aes_write(dd, offset, val);
  88 }
  89
  90 static void omap_aes_write_n(struct omap_aes_dev *dd, u32 offset,
  91                                         u32 *value, int count)
  92 {
  93         for (; count--; value++, offset += 4)
  94                 omap_aes_write(dd, offset, *value);
  95 }
  96
  97 static int omap_aes_hw_init(struct omap_aes_dev *dd)
  98 {
  99         int err;
 100
 101         if (!(dd->flags & FLAGS_INIT)) {
 102                 dd->flags |= FLAGS_INIT;
 103                 dd->err = 0;
 104         }
 105
 106         err = pm_runtime_get_sync(dd->dev);
 107         if (err < 0) {
 108                 dev_err(dd->dev, "failed to get sync: %d\n", err);
 109                 return err;
 110         }
 111
 112         return 0;
 113 }
 114
 115 void omap_aes_clear_copy_flags(struct omap_aes_dev *dd)
 116 {
 117         dd->flags &= ~(OMAP_CRYPTO_COPY_MASK << FLAGS_IN_DATA_ST_SHIFT);
 118         dd->flags &= ~(OMAP_CRYPTO_COPY_MASK << FLAGS_OUT_DATA_ST_SHIFT);
 119         dd->flags &= ~(OMAP_CRYPTO_COPY_MASK << FLAGS_ASSOC_DATA_ST_SHIFT);
 120 }
 121
 122 int omap_aes_write_ctrl(struct omap_aes_dev *dd)
 123 {
 124         struct omap_aes_reqctx *rctx;
 125         unsigned int key32;
 126         int i, err;
 127         u32 val;
 128
 129         err = omap_aes_hw_init(dd);
 130         if (err)
 131                 return err;
 132
 133         key32 = dd->ctx->keylen / sizeof(u32);
 134
 135         /* RESET the key as previous HASH keys should not get affected*/
 136         if (dd->flags & FLAGS_GCM)
 137                 for (i = 0; i < 0x40; i = i + 4)
 138                         omap_aes_write(dd, i, 0x0);
 139
 140         for (i = 0; i < key32; i++) {
 141                 omap_aes_write(dd, AES_REG_KEY(dd, i),
 142                         __le32_to_cpu(dd->ctx->key[i]));
 143         }
 144
 145         if ((dd->flags & (FLAGS_CBC | FLAGS_CTR)) && dd->req->iv)
 146                 omap_aes_write_n(dd, AES_REG_IV(dd, 0), (void *)dd->req->iv, 4);
 147
 148         if ((dd->flags & (FLAGS_GCM)) && dd->aead_req->iv) {
 149                 rctx = aead_request_ctx(dd->aead_req);
 150                 omap_aes_write_n(dd, AES_REG_IV(dd, 0), (u32 *)rctx->iv, 4);
 151         }
 152
 153         val = FLD_VAL(((dd->ctx->keylen >> 3) - 1), 4, 3);
 154         if (dd->flags & FLAGS_CBC)
 155                 val |= AES_REG_CTRL_CBC;
 156
 157         if (dd->flags & (FLAGS_CTR | FLAGS_GCM))
 158                 val |= AES_REG_CTRL_CTR | AES_REG_CTRL_CTR_WIDTH_128;
 159
 160         if (dd->flags & FLAGS_GCM)
 161                 val |= AES_REG_CTRL_GCM;
 162
 163         if (dd->flags & FLAGS_ENCRYPT)
 164                 val |= AES_REG_CTRL_DIRECTION;
 165
 166         omap_aes_write_mask(dd, AES_REG_CTRL(dd), val, AES_REG_CTRL_MASK);
 167
 168         return 0;
 169 }
 170
 171 static void omap_aes_dma_trigger_omap2(struct omap_aes_dev *dd, int length)
 172 {
 173         u32 mask, val;
 174
 175         val = dd->pdata->dma_start;
 176
 177         if (dd->dma_lch_out != NULL)
 178                 val |= dd->pdata->dma_enable_out;
 179         if (dd->dma_lch_in != NULL)
 180                 val |= dd->pdata->dma_enable_in;
 181
 182         mask = dd->pdata->dma_enable_out | dd->pdata->dma_enable_in |
 183                dd->pdata->dma_start;
 184
 185         omap_aes_write_mask(dd, AES_REG_MASK(dd), val, mask);
 186
 187 }
 188
 189 static void omap_aes_dma_trigger_omap4(struct omap_aes_dev *dd, int length)
 190 {
 191         omap_aes_write(dd, AES_REG_LENGTH_N(0), length);
 192         omap_aes_write(dd, AES_REG_LENGTH_N(1), 0);
 193         if (dd->flags & FLAGS_GCM)
 194                 omap_aes_write(dd, AES_REG_A_LEN, dd->assoc_len);
 195
 196         omap_aes_dma_trigger_omap2(dd, length);
 197 }
 198
 199 static void omap_aes_dma_stop(struct omap_aes_dev *dd)
 200 {
 201         u32 mask;
 202
 203         mask = dd->pdata->dma_enable_out | dd->pdata->dma_enable_in |
 204                dd->pdata->dma_start;
 205
 206         omap_aes_write_mask(dd, AES_REG_MASK(dd), 0, mask);
 207 }
 208
 209 struct omap_aes_dev *omap_aes_find_dev(struct omap_aes_reqctx *rctx)
 210 {
 211         struct omap_aes_dev *dd;
 212
 213         spin_lock_bh(&list_lock);
 214         dd = list_first_entry(&dev_list, struct omap_aes_dev, list);
 215         list_move_tail(&dd->list, &dev_list);
 216         rctx->dd = dd;
 217         spin_unlock_bh(&list_lock);
 218
 219         return dd;
 220 }
 221
 222 static void omap_aes_dma_out_callback(void *data)
 223 {
 224         struct omap_aes_dev *dd = data;
 225
 226         /* dma_lch_out - completed */
 227         tasklet_schedule(&dd->done_task);
 228 }
 229
 230 static int omap_aes_dma_init(struct omap_aes_dev *dd)
 231 {
 232         int err;
 233
 234         dd->dma_lch_out = NULL;
 235         dd->dma_lch_in = NULL;
 236
 237         dd->dma_lch_in = dma_request_chan(dd->dev, "rx");
 238         if (IS_ERR(dd->dma_lch_in)) {
 239                 dev_err(dd->dev, "Unable to request in DMA channel\n");
 240                 return PTR_ERR(dd->dma_lch_in);
 241         }
 242
 243         dd->dma_lch_out = dma_request_chan(dd->dev, "tx");
 244         if (IS_ERR(dd->dma_lch_out)) {
 245                 dev_err(dd->dev, "Unable to request out DMA channel\n");
 246                 err = PTR_ERR(dd->dma_lch_out);
 247                 goto err_dma_out;
 248         }
 249
 250         return 0;
 251
 252 err_dma_out:
 253         dma_release_channel(dd->dma_lch_in);
 254
 255         return err;
 256 }
 257
 258 static void omap_aes_dma_cleanup(struct omap_aes_dev *dd)
 259 {
 260         if (dd->pio_only)
 261                 return;
 262
 263         dma_release_channel(dd->dma_lch_out);
 264         dma_release_channel(dd->dma_lch_in);
 265 }
 266
 267 static int omap_aes_crypt_dma(struct omap_aes_dev *dd,
 268                               struct scatterlist *in_sg,
 269                               struct scatterlist *out_sg,
 270                               int in_sg_len, int out_sg_len)
 271 {
 272         struct dma_async_tx_descriptor *tx_in, *tx_out = NULL, *cb_desc;
 273         struct dma_slave_config cfg;
 274         int ret;
 275
 276         if (dd->pio_only) {
 277                 scatterwalk_start(&dd->in_walk, dd->in_sg);
 278                 if (out_sg_len)
 279                         scatterwalk_start(&dd->out_walk, dd->out_sg);
 280
 281                 /* Enable DATAIN interrupt and let it take
 282                    care of the rest */
 283                 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x2);
 284                 return 0;
 285         }
 286
 287         dma_sync_sg_for_device(dd->dev, dd->in_sg, in_sg_len, DMA_TO_DEVICE);
 288
 289         memset(&cfg, 0, sizeof(cfg));
 290
 291         cfg.src_addr = dd->phys_base + AES_REG_DATA_N(dd, 0);
 292         cfg.dst_addr = dd->phys_base + AES_REG_DATA_N(dd, 0);
 293         cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 294         cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 295         cfg.src_maxburst = DST_MAXBURST;
 296         cfg.dst_maxburst = DST_MAXBURST;
 297
 298         /* IN */
 299         ret = dmaengine_slave_config(dd->dma_lch_in, &cfg);
 300         if (ret) {
 301                 dev_err(dd->dev, "can't configure IN dmaengine slave: %d\n",
 302                         ret);
 303                 return ret;
 304         }
 305
 306         tx_in = dmaengine_prep_slave_sg(dd->dma_lch_in, in_sg, in_sg_len,
 307                                         DMA_MEM_TO_DEV,
 308                                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 309         if (!tx_in) {
 310                 dev_err(dd->dev, "IN prep_slave_sg() failed\n");
 311                 return -EINVAL;
 312         }
 313
 314         /* No callback necessary */
 315         tx_in->callback_param = dd;
 316         tx_in->callback = NULL;
 317
 318         /* OUT */
 319         if (out_sg_len) {
 320                 ret = dmaengine_slave_config(dd->dma_lch_out, &cfg);
 321                 if (ret) {
 322                         dev_err(dd->dev, "can't configure OUT dmaengine slave: %d\n",
 323                                 ret);
 324                         return ret;
 325                 }
 326
 327                 tx_out = dmaengine_prep_slave_sg(dd->dma_lch_out, out_sg,
 328                                                  out_sg_len,
 329                                                  DMA_DEV_TO_MEM,
 330                                                  DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 331                 if (!tx_out) {
 332                         dev_err(dd->dev, "OUT prep_slave_sg() failed\n");
 333                         return -EINVAL;
 334                 }
 335
 336                 cb_desc = tx_out;
 337         } else {
 338                 cb_desc = tx_in;
 339         }
 340
 341         if (dd->flags & FLAGS_GCM)
 342                 cb_desc->callback = omap_aes_gcm_dma_out_callback;
 343         else
 344                 cb_desc->callback = omap_aes_dma_out_callback;
 345         cb_desc->callback_param = dd;
 346
 347
 348         dmaengine_submit(tx_in);
 349         if (tx_out)
 350                 dmaengine_submit(tx_out);
 351
 352         dma_async_issue_pending(dd->dma_lch_in);
 353         if (out_sg_len)
 354                 dma_async_issue_pending(dd->dma_lch_out);
 355
 356         /* start DMA */
 357         dd->pdata->trigger(dd, dd->total);
 358
 359         return 0;
 360 }
 361
 362 int omap_aes_crypt_dma_start(struct omap_aes_dev *dd)
 363 {
 364         int err;
 365
 366         pr_debug("total: %d\n", dd->total);
 367
 368         if (!dd->pio_only) {
 369                 err = dma_map_sg(dd->dev, dd->in_sg, dd->in_sg_len,
 370                                  DMA_TO_DEVICE);
 371                 if (!err) {
 372                         dev_err(dd->dev, "dma_map_sg() error\n");
 373                         return -EINVAL;
 374                 }
 375
 376                 if (dd->out_sg_len) {
 377                         err = dma_map_sg(dd->dev, dd->out_sg, dd->out_sg_len,
 378                                          DMA_FROM_DEVICE);
 379                         if (!err) {
 380                                 dev_err(dd->dev, "dma_map_sg() error\n");
 381                                 return -EINVAL;
 382                         }
 383                 }
 384         }
 385
 386         err = omap_aes_crypt_dma(dd, dd->in_sg, dd->out_sg, dd->in_sg_len,
 387                                  dd->out_sg_len);
 388         if (err && !dd->pio_only) {
 389                 dma_unmap_sg(dd->dev, dd->in_sg, dd->in_sg_len, DMA_TO_DEVICE);
 390                 if (dd->out_sg_len)
 391                         dma_unmap_sg(dd->dev, dd->out_sg, dd->out_sg_len,
 392                                      DMA_FROM_DEVICE);
 393         }
 394
 395         return err;
 396 }
 397
 398 static void omap_aes_finish_req(struct omap_aes_dev *dd, int err)
 399 {
 400         struct skcipher_request *req = dd->req;
 401
 402         pr_debug("err: %d\n", err);
 403
 404         crypto_finalize_skcipher_request(dd->engine, req, err);
 405
 406         pm_runtime_mark_last_busy(dd->dev);
 407         pm_runtime_put_autosuspend(dd->dev);
 408 }
 409
 410 int omap_aes_crypt_dma_stop(struct omap_aes_dev *dd)
 411 {
 412         pr_debug("total: %d\n", dd->total);
 413
 414         omap_aes_dma_stop(dd);
 415
 416
 417         return 0;
 418 }
 419
 420 static int omap_aes_handle_queue(struct omap_aes_dev *dd,
 421                                  struct skcipher_request *req)
 422 {
 423         if (req)
 424                 return crypto_transfer_skcipher_request_to_engine(dd->engine, req);
 425
 426         return 0;
 427 }
 428
 429 static int omap_aes_prepare_req(struct crypto_engine *engine,
 430                                 void *areq)
 431 {
 432         struct skcipher_request *req = container_of(areq, struct skcipher_request, base);
 433         struct omap_aes_ctx *ctx = crypto_skcipher_ctx(
 434                         crypto_skcipher_reqtfm(req));
 435         struct omap_aes_reqctx *rctx = skcipher_request_ctx(req);
 436         struct omap_aes_dev *dd = rctx->dd;
 437         int ret;
 438         u16 flags;
 439
 440         if (!dd)
 441                 return -ENODEV;
 442
 443         /* assign new request to device */
 444         dd->req = req;
 445         dd->total = req->cryptlen;
 446         dd->total_save = req->cryptlen;
 447         dd->in_sg = req->src;
 448         dd->out_sg = req->dst;
 449         dd->orig_out = req->dst;
 450
 451         flags = OMAP_CRYPTO_COPY_DATA;
 452         if (req->src == req->dst)
 453                 flags |= OMAP_CRYPTO_FORCE_COPY;
 454
 455         ret = omap_crypto_align_sg(&dd->in_sg, dd->total, AES_BLOCK_SIZE,
 456                                    dd->in_sgl, flags,
 457                                    FLAGS_IN_DATA_ST_SHIFT, &dd->flags);
 458         if (ret)
 459                 return ret;
 460
 461         ret = omap_crypto_align_sg(&dd->out_sg, dd->total, AES_BLOCK_SIZE,
 462                                    &dd->out_sgl, 0,
 463                                    FLAGS_OUT_DATA_ST_SHIFT, &dd->flags);
 464         if (ret)
 465                 return ret;
 466
 467         dd->in_sg_len = sg_nents_for_len(dd->in_sg, dd->total);
 468         if (dd->in_sg_len < 0)
 469                 return dd->in_sg_len;
 470
 471         dd->out_sg_len = sg_nents_for_len(dd->out_sg, dd->total);
 472         if (dd->out_sg_len < 0)
 473                 return dd->out_sg_len;
 474
 475         rctx->mode &= FLAGS_MODE_MASK;
 476         dd->flags = (dd->flags & ~FLAGS_MODE_MASK) | rctx->mode;
 477
 478         dd->ctx = ctx;
 479         rctx->dd = dd;
 480
 481         return omap_aes_write_ctrl(dd);
 482 }
 483
 484 static int omap_aes_crypt_req(struct crypto_engine *engine,
 485                               void *areq)
 486 {
 487         struct skcipher_request *req = container_of(areq, struct skcipher_request, base);
 488         struct omap_aes_reqctx *rctx = skcipher_request_ctx(req);
 489         struct omap_aes_dev *dd = rctx->dd;
 490
 491         if (!dd)
 492                 return -ENODEV;
 493
 494         return omap_aes_crypt_dma_start(dd);
 495 }
 496
 497 static void omap_aes_copy_ivout(struct omap_aes_dev *dd, u8 *ivbuf)
 498 {
 499         int i;
 500
 501         for (i = 0; i < 4; i++)
 502                 ((u32 *)ivbuf)[i] = omap_aes_read(dd, AES_REG_IV(dd, i));
 503 }
 504
 505 static void omap_aes_done_task(unsigned long data)
 506 {
 507         struct omap_aes_dev *dd = (struct omap_aes_dev *)data;
 508
 509         pr_debug("enter done_task\n");
 510
 511         if (!dd->pio_only) {
 512                 dma_sync_sg_for_device(dd->dev, dd->out_sg, dd->out_sg_len,
 513                                        DMA_FROM_DEVICE);
 514                 dma_unmap_sg(dd->dev, dd->in_sg, dd->in_sg_len, DMA_TO_DEVICE);
 515                 dma_unmap_sg(dd->dev, dd->out_sg, dd->out_sg_len,
 516                              DMA_FROM_DEVICE);
 517                 omap_aes_crypt_dma_stop(dd);
 518         }
 519
 520         omap_crypto_cleanup(dd->in_sg, NULL, 0, dd->total_save,
 521                             FLAGS_IN_DATA_ST_SHIFT, dd->flags);
 522
 523         omap_crypto_cleanup(dd->out_sg, dd->orig_out, 0, dd->total_save,
 524                             FLAGS_OUT_DATA_ST_SHIFT, dd->flags);
 525
 526         /* Update IV output */
 527         if (dd->flags & (FLAGS_CBC | FLAGS_CTR))
 528                 omap_aes_copy_ivout(dd, dd->req->iv);
 529
 530         omap_aes_finish_req(dd, 0);
 531
 532         pr_debug("exit\n");
 533 }
 534
 535 static int omap_aes_crypt(struct skcipher_request *req, unsigned long mode)
 536 {
 537         struct omap_aes_ctx *ctx = crypto_skcipher_ctx(
 538                         crypto_skcipher_reqtfm(req));
 539         struct omap_aes_reqctx *rctx = skcipher_request_ctx(req);
 540         struct omap_aes_dev *dd;
 541         int ret;
 542
 543         if ((req->cryptlen % AES_BLOCK_SIZE) && !(mode & FLAGS_CTR))
 544                 return -EINVAL;
 545
 546         pr_debug("nbytes: %d, enc: %d, cbc: %d\n", req->cryptlen,
 547                   !!(mode & FLAGS_ENCRYPT),
 548                   !!(mode & FLAGS_CBC));
 549
 550         if (req->cryptlen < aes_fallback_sz) {
 551                 SYNC_SKCIPHER_REQUEST_ON_STACK(subreq, ctx->fallback);
 552
 553                 skcipher_request_set_sync_tfm(subreq, ctx->fallback);
 554                 skcipher_request_set_callback(subreq, req->base.flags, NULL,
 555                                               NULL);
 556                 skcipher_request_set_crypt(subreq, req->src, req->dst,
 557                                            req->cryptlen, req->iv);
 558
 559                 if (mode & FLAGS_ENCRYPT)
 560                         ret = crypto_skcipher_encrypt(subreq);
 561                 else
 562                         ret = crypto_skcipher_decrypt(subreq);
 563
 564                 skcipher_request_zero(subreq);
 565                 return ret;
 566         }
 567         dd = omap_aes_find_dev(rctx);
 568         if (!dd)
 569                 return -ENODEV;
 570
 571         rctx->mode = mode;
 572
 573         return omap_aes_handle_queue(dd, req);
 574 }
 575
 576 /* ********************** ALG API ************************************ */
 577
 578 static int omap_aes_setkey(struct crypto_skcipher *tfm, const u8 *key,
 579                            unsigned int keylen)
 580 {
 581         struct omap_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
 582         int ret;
 583
 584         if (keylen != AES_KEYSIZE_128 && keylen != AES_KEYSIZE_192 &&
 585                    keylen != AES_KEYSIZE_256)
 586                 return -EINVAL;
 587
 588         pr_debug("enter, keylen: %d\n", keylen);
 589
 590         memcpy(ctx->key, key, keylen);
 591         ctx->keylen = keylen;
 592
 593         crypto_sync_skcipher_clear_flags(ctx->fallback, CRYPTO_TFM_REQ_MASK);
 594         crypto_sync_skcipher_set_flags(ctx->fallback, tfm->base.crt_flags &
 595                                                  CRYPTO_TFM_REQ_MASK);
 596
 597         ret = crypto_sync_skcipher_setkey(ctx->fallback, key, keylen);
 598         if (!ret)
 599                 return 0;
 600
 601         return 0;
 602 }
 603
 604 static int omap_aes_ecb_encrypt(struct skcipher_request *req)
 605 {
 606         return omap_aes_crypt(req, FLAGS_ENCRYPT);
 607 }
 608
 609 static int omap_aes_ecb_decrypt(struct skcipher_request *req)
 610 {
 611         return omap_aes_crypt(req, 0);
 612 }
 613
 614 static int omap_aes_cbc_encrypt(struct skcipher_request *req)
 615 {
 616         return omap_aes_crypt(req, FLAGS_ENCRYPT | FLAGS_CBC);
 617 }
 618
 619 static int omap_aes_cbc_decrypt(struct skcipher_request *req)
 620 {
 621         return omap_aes_crypt(req, FLAGS_CBC);
 622 }
 623
 624 static int omap_aes_ctr_encrypt(struct skcipher_request *req)
 625 {
 626         return omap_aes_crypt(req, FLAGS_ENCRYPT | FLAGS_CTR);
 627 }
 628
 629 static int omap_aes_ctr_decrypt(struct skcipher_request *req)
 630 {
 631         return omap_aes_crypt(req, FLAGS_CTR);
 632 }
 633
 634 static int omap_aes_prepare_req(struct crypto_engine *engine,
 635                                 void *req);
 636 static int omap_aes_crypt_req(struct crypto_engine *engine,
 637                               void *req);
 638
 639 static int omap_aes_init_tfm(struct crypto_skcipher *tfm)
 640 {
 641         const char *name = crypto_tfm_alg_name(&tfm->base);
 642         struct omap_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
 643         struct crypto_sync_skcipher *blk;
 644
 645         blk = crypto_alloc_sync_skcipher(name, 0, CRYPTO_ALG_NEED_FALLBACK);
 646         if (IS_ERR(blk))
 647                 return PTR_ERR(blk);
 648
 649         ctx->fallback = blk;
 650
 651         crypto_skcipher_set_reqsize(tfm, sizeof(struct omap_aes_reqctx));
 652
 653         ctx->enginectx.op.prepare_request = omap_aes_prepare_req;
 654         ctx->enginectx.op.unprepare_request = NULL;
 655         ctx->enginectx.op.do_one_request = omap_aes_crypt_req;
 656
 657         return 0;
 658 }
 659
 660 static void omap_aes_exit_tfm(struct crypto_skcipher *tfm)
 661 {
 662         struct omap_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
 663
 664         if (ctx->fallback)
 665                 crypto_free_sync_skcipher(ctx->fallback);
 666
 667         ctx->fallback = NULL;
 668 }
 669
 670 /* ********************** ALGS ************************************ */
 671
 672 static struct skcipher_alg algs_ecb_cbc[] = {
 673 {
 674         .base.cra_name          = "ecb(aes)",
 675         .base.cra_driver_name   = "ecb-aes-omap",
 676         .base.cra_priority      = 300,
 677         .base.cra_flags         = CRYPTO_ALG_KERN_DRIVER_ONLY |
 678                                   CRYPTO_ALG_ASYNC |
 679                                   CRYPTO_ALG_NEED_FALLBACK,
 680         .base.cra_blocksize     = AES_BLOCK_SIZE,
 681         .base.cra_ctxsize       = sizeof(struct omap_aes_ctx),
 682         .base.cra_module        = THIS_MODULE,
 683
 684         .min_keysize            = AES_MIN_KEY_SIZE,
 685         .max_keysize            = AES_MAX_KEY_SIZE,
 686         .setkey                 = omap_aes_setkey,
 687         .encrypt                = omap_aes_ecb_encrypt,
 688         .decrypt                = omap_aes_ecb_decrypt,
 689         .init                   = omap_aes_init_tfm,
 690         .exit                   = omap_aes_exit_tfm,
 691 },
 692 {
 693         .base.cra_name          = "cbc(aes)",
 694         .base.cra_driver_name   = "cbc-aes-omap",
 695         .base.cra_priority      = 300,
 696         .base.cra_flags         = CRYPTO_ALG_KERN_DRIVER_ONLY |
 697                                   CRYPTO_ALG_ASYNC |
 698                                   CRYPTO_ALG_NEED_FALLBACK,
 699         .base.cra_blocksize     = AES_BLOCK_SIZE,
 700         .base.cra_ctxsize       = sizeof(struct omap_aes_ctx),
 701         .base.cra_module        = THIS_MODULE,
 702
 703         .min_keysize            = AES_MIN_KEY_SIZE,
 704         .max_keysize            = AES_MAX_KEY_SIZE,
 705         .ivsize                 = AES_BLOCK_SIZE,
 706         .setkey                 = omap_aes_setkey,
 707         .encrypt                = omap_aes_cbc_encrypt,
 708         .decrypt                = omap_aes_cbc_decrypt,
 709         .init                   = omap_aes_init_tfm,
 710         .exit                   = omap_aes_exit_tfm,
 711 }
 712 };
 713
 714 static struct skcipher_alg algs_ctr[] = {
 715 {
 716         .base.cra_name          = "ctr(aes)",
 717         .base.cra_driver_name   = "ctr-aes-omap",
 718         .base.cra_priority      = 300,
 719         .base.cra_flags         = CRYPTO_ALG_KERN_DRIVER_ONLY |
 720                                   CRYPTO_ALG_ASYNC |
 721                                   CRYPTO_ALG_NEED_FALLBACK,
 722         .base.cra_blocksize     = 1,
 723         .base.cra_ctxsize       = sizeof(struct omap_aes_ctx),
 724         .base.cra_module        = THIS_MODULE,
 725
 726         .min_keysize            = AES_MIN_KEY_SIZE,
 727         .max_keysize            = AES_MAX_KEY_SIZE,
 728         .ivsize                 = AES_BLOCK_SIZE,
 729         .setkey                 = omap_aes_setkey,
 730         .encrypt                = omap_aes_ctr_encrypt,
 731         .decrypt                = omap_aes_ctr_decrypt,
 732         .init                   = omap_aes_init_tfm,
 733         .exit                   = omap_aes_exit_tfm,
 734 }
 735 };
 736
 737 static struct omap_aes_algs_info omap_aes_algs_info_ecb_cbc[] = {
 738         {
 739                 .algs_list      = algs_ecb_cbc,
 740                 .size           = ARRAY_SIZE(algs_ecb_cbc),
 741         },
 742 };
 743
 744 static struct aead_alg algs_aead_gcm[] = {
 745 {
 746         .base = {
 747                 .cra_name               = "gcm(aes)",
 748                 .cra_driver_name        = "gcm-aes-omap",
 749                 .cra_priority           = 300,
 750                 .cra_flags              = CRYPTO_ALG_ASYNC |
 751                                           CRYPTO_ALG_KERN_DRIVER_ONLY,
 752                 .cra_blocksize          = 1,
 753                 .cra_ctxsize            = sizeof(struct omap_aes_gcm_ctx),
 754                 .cra_alignmask          = 0xf,
 755                 .cra_module             = THIS_MODULE,
 756         },
 757         .init           = omap_aes_gcm_cra_init,
 758         .ivsize         = GCM_AES_IV_SIZE,
 759         .maxauthsize    = AES_BLOCK_SIZE,
 760         .setkey         = omap_aes_gcm_setkey,
 761         .setauthsize    = omap_aes_gcm_setauthsize,
 762         .encrypt        = omap_aes_gcm_encrypt,
 763         .decrypt        = omap_aes_gcm_decrypt,
 764 },
 765 {
 766         .base = {
 767                 .cra_name               = "rfc4106(gcm(aes))",
 768                 .cra_driver_name        = "rfc4106-gcm-aes-omap",
 769                 .cra_priority           = 300,
 770                 .cra_flags              = CRYPTO_ALG_ASYNC |
 771                                           CRYPTO_ALG_KERN_DRIVER_ONLY,
 772                 .cra_blocksize          = 1,
 773                 .cra_ctxsize            = sizeof(struct omap_aes_gcm_ctx),
 774                 .cra_alignmask          = 0xf,
 775                 .cra_module             = THIS_MODULE,
 776         },
 777         .init           = omap_aes_gcm_cra_init,
 778         .maxauthsize    = AES_BLOCK_SIZE,
 779         .ivsize         = GCM_RFC4106_IV_SIZE,
 780         .setkey         = omap_aes_4106gcm_setkey,
 781         .setauthsize    = omap_aes_4106gcm_setauthsize,
 782         .encrypt        = omap_aes_4106gcm_encrypt,
 783         .decrypt        = omap_aes_4106gcm_decrypt,
 784 },
 785 };
 786
 787 static struct omap_aes_aead_algs omap_aes_aead_info = {
 788         .algs_list      =       algs_aead_gcm,
 789         .size           =       ARRAY_SIZE(algs_aead_gcm),
 790 };
 791
 792 static const struct omap_aes_pdata omap_aes_pdata_omap2 = {
 793         .algs_info      = omap_aes_algs_info_ecb_cbc,
 794         .algs_info_size = ARRAY_SIZE(omap_aes_algs_info_ecb_cbc),
 795         .trigger        = omap_aes_dma_trigger_omap2,
 796         .key_ofs        = 0x1c,
 797         .iv_ofs         = 0x20,
 798         .ctrl_ofs       = 0x30,
 799         .data_ofs       = 0x34,
 800         .rev_ofs        = 0x44,
 801         .mask_ofs       = 0x48,
 802         .dma_enable_in  = BIT(2),
 803         .dma_enable_out = BIT(3),
 804         .dma_start      = BIT(5),
 805         .major_mask     = 0xf0,
 806         .major_shift    = 4,
 807         .minor_mask     = 0x0f,
 808         .minor_shift    = 0,
 809 };
 810
 811 #ifdef CONFIG_OF
 812 static struct omap_aes_algs_info omap_aes_algs_info_ecb_cbc_ctr[] = {
 813         {
 814                 .algs_list      = algs_ecb_cbc,
 815                 .size           = ARRAY_SIZE(algs_ecb_cbc),
 816         },
 817         {
 818                 .algs_list      = algs_ctr,
 819                 .size           = ARRAY_SIZE(algs_ctr),
 820         },
 821 };
 822
 823 static const struct omap_aes_pdata omap_aes_pdata_omap3 = {
 824         .algs_info      = omap_aes_algs_info_ecb_cbc_ctr,
 825         .algs_info_size = ARRAY_SIZE(omap_aes_algs_info_ecb_cbc_ctr),
 826         .trigger        = omap_aes_dma_trigger_omap2,
 827         .key_ofs        = 0x1c,
 828         .iv_ofs         = 0x20,
 829         .ctrl_ofs       = 0x30,
 830         .data_ofs       = 0x34,
 831         .rev_ofs        = 0x44,
 832         .mask_ofs       = 0x48,
 833         .dma_enable_in  = BIT(2),
 834         .dma_enable_out = BIT(3),
 835         .dma_start      = BIT(5),
 836         .major_mask     = 0xf0,
 837         .major_shift    = 4,
 838         .minor_mask     = 0x0f,
 839         .minor_shift    = 0,
 840 };
 841
 842 static const struct omap_aes_pdata omap_aes_pdata_omap4 = {
 843         .algs_info      = omap_aes_algs_info_ecb_cbc_ctr,
 844         .algs_info_size = ARRAY_SIZE(omap_aes_algs_info_ecb_cbc_ctr),
 845         .aead_algs_info = &omap_aes_aead_info,
 846         .trigger        = omap_aes_dma_trigger_omap4,
 847         .key_ofs        = 0x3c,
 848         .iv_ofs         = 0x40,
 849         .ctrl_ofs       = 0x50,
 850         .data_ofs       = 0x60,
 851         .rev_ofs        = 0x80,
 852         .mask_ofs       = 0x84,
 853         .irq_status_ofs = 0x8c,
 854         .irq_enable_ofs = 0x90,
 855         .dma_enable_in  = BIT(5),
 856         .dma_enable_out = BIT(6),
 857         .major_mask     = 0x0700,
 858         .major_shift    = 8,
 859         .minor_mask     = 0x003f,
 860         .minor_shift    = 0,
 861 };
 862
 863 static irqreturn_t omap_aes_irq(int irq, void *dev_id)
 864 {
 865         struct omap_aes_dev *dd = dev_id;
 866         u32 status, i;
 867         u32 *src, *dst;
 868
 869         status = omap_aes_read(dd, AES_REG_IRQ_STATUS(dd));
 870         if (status & AES_REG_IRQ_DATA_IN) {
 871                 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x0);
 872
 873                 BUG_ON(!dd->in_sg);
 874
 875                 BUG_ON(_calc_walked(in) > dd->in_sg->length);
 876
 877                 src = sg_virt(dd->in_sg) + _calc_walked(in);
 878
 879                 for (i = 0; i < AES_BLOCK_WORDS; i++) {
 880                         omap_aes_write(dd, AES_REG_DATA_N(dd, i), *src);
 881
 882                         scatterwalk_advance(&dd->in_walk, 4);
 883                         if (dd->in_sg->length == _calc_walked(in)) {
 884                                 dd->in_sg = sg_next(dd->in_sg);
 885                                 if (dd->in_sg) {
 886                                         scatterwalk_start(&dd->in_walk,
 887                                                           dd->in_sg);
 888                                         src = sg_virt(dd->in_sg) +
 889                                               _calc_walked(in);
 890                                 }
 891                         } else {
 892                                 src++;
 893                         }
 894                 }
 895
 896                 /* Clear IRQ status */
 897                 status &= ~AES_REG_IRQ_DATA_IN;
 898                 omap_aes_write(dd, AES_REG_IRQ_STATUS(dd), status);
 899
 900                 /* Enable DATA_OUT interrupt */
 901                 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x4);
 902
 903         } else if (status & AES_REG_IRQ_DATA_OUT) {
 904                 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x0);
 905
 906                 BUG_ON(!dd->out_sg);
 907
 908                 BUG_ON(_calc_walked(out) > dd->out_sg->length);
 909
 910                 dst = sg_virt(dd->out_sg) + _calc_walked(out);
 911
 912                 for (i = 0; i < AES_BLOCK_WORDS; i++) {
 913                         *dst = omap_aes_read(dd, AES_REG_DATA_N(dd, i));
 914                         scatterwalk_advance(&dd->out_walk, 4);
 915                         if (dd->out_sg->length == _calc_walked(out)) {
 916                                 dd->out_sg = sg_next(dd->out_sg);
 917                                 if (dd->out_sg) {
 918                                         scatterwalk_start(&dd->out_walk,
 919                                                           dd->out_sg);
 920                                         dst = sg_virt(dd->out_sg) +
 921                                               _calc_walked(out);
 922                                 }
 923                         } else {
 924                                 dst++;
 925                         }
 926                 }
 927
 928                 dd->total -= min_t(size_t, AES_BLOCK_SIZE, dd->total);
 929
 930                 /* Clear IRQ status */
 931                 status &= ~AES_REG_IRQ_DATA_OUT;
 932                 omap_aes_write(dd, AES_REG_IRQ_STATUS(dd), status);
 933
 934                 if (!dd->total)
 935                         /* All bytes read! */
 936                         tasklet_schedule(&dd->done_task);
 937                 else
 938                         /* Enable DATA_IN interrupt for next block */
 939                         omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x2);
 940         }
 941
 942         return IRQ_HANDLED;
 943 }
 944
 945 static const struct of_device_id omap_aes_of_match[] = {
 946         {
 947                 .compatible     = "ti,omap2-aes",
 948                 .data           = &omap_aes_pdata_omap2,
 949         },
 950         {
 951                 .compatible     = "ti,omap3-aes",
 952                 .data           = &omap_aes_pdata_omap3,
 953         },
 954         {
 955                 .compatible     = "ti,omap4-aes",
 956                 .data           = &omap_aes_pdata_omap4,
 957         },
 958         {},
 959 };
 960 MODULE_DEVICE_TABLE(of, omap_aes_of_match);
 961
 962 static int omap_aes_get_res_of(struct omap_aes_dev *dd,
 963                 struct device *dev, struct resource *res)
 964 {
 965         struct device_node *node = dev->of_node;
 966         int err = 0;
 967
 968         dd->pdata = of_device_get_match_data(dev);
 969         if (!dd->pdata) {
 970                 dev_err(dev, "no compatible OF match\n");
 971                 err = -EINVAL;
 972                 goto err;
 973         }
 974
 975         err = of_address_to_resource(node, 0, res);
 976         if (err < 0) {
 977                 dev_err(dev, "can't translate OF node address\n");
 978                 err = -EINVAL;
 979                 goto err;
 980         }
 981
 982 err:
 983         return err;
 984 }
 985 #else
 986 static const struct of_device_id omap_aes_of_match[] = {
 987         {},
 988 };
 989
 990 static int omap_aes_get_res_of(struct omap_aes_dev *dd,
 991                 struct device *dev, struct resource *res)
 992 {
 993         return -EINVAL;
 994 }
 995 #endif
 996
 997 static int omap_aes_get_res_pdev(struct omap_aes_dev *dd,
 998                 struct platform_device *pdev, struct resource *res)
 999 {
1000         struct device *dev = &pdev->dev;
1001         struct resource *r;
1002         int err = 0;
1003
1004         /* Get the base address */
1005         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1006         if (!r) {
1007                 dev_err(dev, "no MEM resource info\n");
1008                 err = -ENODEV;
1009                 goto err;
1010         }
1011         memcpy(res, r, sizeof(*res));
1012
1013         /* Only OMAP2/3 can be non-DT */
1014         dd->pdata = &omap_aes_pdata_omap2;
1015
1016 err:
1017         return err;
1018 }
1019
1020 static ssize_t fallback_show(struct device *dev, struct device_attribute *attr,
1021                              char *buf)
1022 {
1023         return sprintf(buf, "%d\n", aes_fallback_sz);
1024 }
1025
1026 static ssize_t fallback_store(struct device *dev, struct device_attribute *attr,
1027                               const char *buf, size_t size)
1028 {
1029         ssize_t status;
1030         long value;
1031
1032         status = kstrtol(buf, 0, &value);
1033         if (status)
1034                 return status;
1035
1036         /* HW accelerator only works with buffers > 9 */
1037         if (value < 9) {
1038                 dev_err(dev, "minimum fallback size 9\n");
1039                 return -EINVAL;
1040         }
1041
1042         aes_fallback_sz = value;
1043
1044         return size;
1045 }
1046
1047 static ssize_t queue_len_show(struct device *dev, struct device_attribute *attr,
1048                               char *buf)
1049 {
1050         struct omap_aes_dev *dd = dev_get_drvdata(dev);
1051
1052         return sprintf(buf, "%d\n", dd->engine->queue.max_qlen);
1053 }
1054
1055 static ssize_t queue_len_store(struct device *dev,
1056                                struct device_attribute *attr, const char *buf,
1057                                size_t size)
1058 {
1059         struct omap_aes_dev *dd;
1060         ssize_t status;
1061         long value;
1062         unsigned long flags;
1063
1064         status = kstrtol(buf, 0, &value);
1065         if (status)
1066                 return status;
1067
1068         if (value < 1)
1069                 return -EINVAL;
1070
1071         /*
1072          * Changing the queue size in fly is safe, if size becomes smaller
1073          * than current size, it will just not accept new entries until
1074          * it has shrank enough.
1075          */
1076         spin_lock_bh(&list_lock);
1077         list_for_each_entry(dd, &dev_list, list) {
1078                 spin_lock_irqsave(&dd->lock, flags);
1079                 dd->engine->queue.max_qlen = value;
1080                 dd->aead_queue.base.max_qlen = value;
1081                 spin_unlock_irqrestore(&dd->lock, flags);
1082         }
1083         spin_unlock_bh(&list_lock);
1084
1085         return size;
1086 }
1087
1088 static DEVICE_ATTR_RW(queue_len);
1089 static DEVICE_ATTR_RW(fallback);
1090
1091 static struct attribute *omap_aes_attrs[] = {
1092         &dev_attr_queue_len.attr,
1093         &dev_attr_fallback.attr,
1094         NULL,
1095 };
1096
1097 static struct attribute_group omap_aes_attr_group = {
1098         .attrs = omap_aes_attrs,
1099 };
1100
1101 static int omap_aes_probe(struct platform_device *pdev)
1102 {
1103         struct device *dev = &pdev->dev;
1104         struct omap_aes_dev *dd;
1105         struct skcipher_alg *algp;
1106         struct aead_alg *aalg;
1107         struct resource res;
1108         int err = -ENOMEM, i, j, irq = -1;
1109         u32 reg;
1110
1111         dd = devm_kzalloc(dev, sizeof(struct omap_aes_dev), GFP_KERNEL);
1112         if (dd == NULL) {
1113                 dev_err(dev, "unable to alloc data struct.\n");
1114                 goto err_data;
1115         }
1116         dd->dev = dev;
1117         platform_set_drvdata(pdev, dd);
1118
1119         aead_init_queue(&dd->aead_queue, OMAP_AES_QUEUE_LENGTH);
1120
1121         err = (dev->of_node) ? omap_aes_get_res_of(dd, dev, &res) :
1122                                omap_aes_get_res_pdev(dd, pdev, &res);
1123         if (err)
1124                 goto err_res;
1125
1126         dd->io_base = devm_ioremap_resource(dev, &res);
1127         if (IS_ERR(dd->io_base)) {
1128                 err = PTR_ERR(dd->io_base);
1129                 goto err_res;
1130         }
1131         dd->phys_base = res.start;
1132
1133         pm_runtime_use_autosuspend(dev);
1134         pm_runtime_set_autosuspend_delay(dev, DEFAULT_AUTOSUSPEND_DELAY);
1135
1136         pm_runtime_enable(dev);
1137         err = pm_runtime_get_sync(dev);
1138         if (err < 0) {
1139                 dev_err(dev, "%s: failed to get_sync(%d)\n",
1140                         __func__, err);
1141                 goto err_res;
1142         }
1143
1144         omap_aes_dma_stop(dd);
1145
1146         reg = omap_aes_read(dd, AES_REG_REV(dd));
1147
1148         pm_runtime_put_sync(dev);
1149
1150         dev_info(dev, "OMAP AES hw accel rev: %u.%u\n",
1151                  (reg & dd->pdata->major_mask) >> dd->pdata->major_shift,
1152                  (reg & dd->pdata->minor_mask) >> dd->pdata->minor_shift);
1153
1154         tasklet_init(&dd->done_task, omap_aes_done_task, (unsigned long)dd);
1155
1156         err = omap_aes_dma_init(dd);
1157         if (err == -EPROBE_DEFER) {
1158                 goto err_irq;
1159         } else if (err && AES_REG_IRQ_STATUS(dd) && AES_REG_IRQ_ENABLE(dd)) {
1160                 dd->pio_only = 1;
1161
1162                 irq = platform_get_irq(pdev, 0);
1163                 if (irq < 0) {
1164                         err = irq;
1165                         goto err_irq;
1166                 }
1167
1168                 err = devm_request_irq(dev, irq, omap_aes_irq, 0,
1169                                 dev_name(dev), dd);
1170                 if (err) {
1171                         dev_err(dev, "Unable to grab omap-aes IRQ\n");
1172                         goto err_irq;
1173                 }
1174         }
1175
1176         spin_lock_init(&dd->lock);
1177
1178         INIT_LIST_HEAD(&dd->list);
1179         spin_lock(&list_lock);
1180         list_add_tail(&dd->list, &dev_list);
1181         spin_unlock(&list_lock);
1182
1183         /* Initialize crypto engine */
1184         dd->engine = crypto_engine_alloc_init(dev, 1);
1185         if (!dd->engine) {
1186                 err = -ENOMEM;
1187                 goto err_engine;
1188         }
1189
1190         err = crypto_engine_start(dd->engine);
1191         if (err)
1192                 goto err_engine;
1193
1194         for (i = 0; i < dd->pdata->algs_info_size; i++) {
1195                 if (!dd->pdata->algs_info[i].registered) {
1196                         for (j = 0; j < dd->pdata->algs_info[i].size; j++) {
1197                                 algp = &dd->pdata->algs_info[i].algs_list[j];
1198
1199                                 pr_debug("reg alg: %s\n", algp->base.cra_name);
1200
1201                                 err = crypto_register_skcipher(algp);
1202                                 if (err)
1203                                         goto err_algs;
1204
1205                                 dd->pdata->algs_info[i].registered++;
1206                         }
1207                 }
1208         }
1209
1210         if (dd->pdata->aead_algs_info &&
1211             !dd->pdata->aead_algs_info->registered) {
1212                 for (i = 0; i < dd->pdata->aead_algs_info->size; i++) {
1213                         aalg = &dd->pdata->aead_algs_info->algs_list[i];
1214
1215                         pr_debug("reg alg: %s\n", aalg->base.cra_name);
1216
1217                         err = crypto_register_aead(aalg);
1218                         if (err)
1219                                 goto err_aead_algs;
1220
1221                         dd->pdata->aead_algs_info->registered++;
1222                 }
1223         }
1224
1225         err = sysfs_create_group(&dev->kobj, &omap_aes_attr_group);
1226         if (err) {
1227                 dev_err(dev, "could not create sysfs device attrs\n");
1228                 goto err_aead_algs;
1229         }
1230
1231         return 0;
1232 err_aead_algs:
1233         for (i = dd->pdata->aead_algs_info->registered - 1; i >= 0; i--) {
1234                 aalg = &dd->pdata->aead_algs_info->algs_list[i];
1235                 crypto_unregister_aead(aalg);
1236         }
1237 err_algs:
1238         for (i = dd->pdata->algs_info_size - 1; i >= 0; i--)
1239                 for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--)
1240                         crypto_unregister_skcipher(
1241                                         &dd->pdata->algs_info[i].algs_list[j]);
1242
1243 err_engine:
1244         if (dd->engine)
1245                 crypto_engine_exit(dd->engine);
1246
1247         omap_aes_dma_cleanup(dd);
1248 err_irq:
1249         tasklet_kill(&dd->done_task);
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_alg *aalg;
1262         int i, j;
1263
1264         if (!dd)
1265                 return -ENODEV;
1266
1267         spin_lock(&list_lock);
1268         list_del(&dd->list);
1269         spin_unlock(&list_lock);
1270
1271         for (i = dd->pdata->algs_info_size - 1; i >= 0; i--)
1272                 for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--)
1273                         crypto_unregister_skcipher(
1274                                         &dd->pdata->algs_info[i].algs_list[j]);
1275
1276         for (i = dd->pdata->aead_algs_info->size - 1; i >= 0; i--) {
1277                 aalg = &dd->pdata->aead_algs_info->algs_list[i];
1278                 crypto_unregister_aead(aalg);
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