drivers/crypto/omap-aes.c

   1 /*
   2  * Cryptographic API.
   3  *
   4  * Support for OMAP AES HW acceleration.
   5  *
   6  * Copyright (c) 2010 Nokia Corporation
   7  * Author: Dmitry Kasatkin <dmitry.kasatkin@nokia.com>
   8  * Copyright (c) 2011 Texas Instruments Incorporated
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as published
  12  * by the Free Software Foundation.
  13  *
  14  */
  15
  16 #define pr_fmt(fmt) "%20s: " fmt, __func__
  17 #define prn(num) pr_debug(#num "=%d\n", num)
  18 #define prx(num) pr_debug(#num "=%x\n", num)
  19
  20 #include <linux/err.h>
  21 #include <linux/module.h>
  22 #include <linux/init.h>
  23 #include <linux/errno.h>
  24 #include <linux/kernel.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/scatterlist.h>
  27 #include <linux/dma-mapping.h>
  28 #include <linux/dmaengine.h>
  29 #include <linux/pm_runtime.h>
  30 #include <linux/of.h>
  31 #include <linux/of_device.h>
  32 #include <linux/of_address.h>
  33 #include <linux/io.h>
  34 #include <linux/crypto.h>
  35 #include <linux/interrupt.h>
  36 #include <crypto/scatterwalk.h>
  37 #include <crypto/aes.h>
  38 #include <crypto/algapi.h>
  39
  40 #define DST_MAXBURST                    4
  41 #define DMA_MIN                         (DST_MAXBURST * sizeof(u32))
  42
  43 #define _calc_walked(inout) (dd->inout##_walk.offset - dd->inout##_sg->offset)
  44
  45 /* OMAP TRM gives bitfields as start:end, where start is the higher bit
  46    number. For example 7:0 */
  47 #define FLD_MASK(start, end)    (((1 << ((start) - (end) + 1)) - 1) << (end))
  48 #define FLD_VAL(val, start, end) (((val) << (end)) & FLD_MASK(start, end))
  49
  50 #define AES_REG_KEY(dd, x)              ((dd)->pdata->key_ofs - \
  51                                                 ((x ^ 0x01) * 0x04))
  52 #define AES_REG_IV(dd, x)               ((dd)->pdata->iv_ofs + ((x) * 0x04))
  53
  54 #define AES_REG_CTRL(dd)                ((dd)->pdata->ctrl_ofs)
  55 #define AES_REG_CTRL_CTR_WIDTH_MASK     GENMASK(8, 7)
  56 #define AES_REG_CTRL_CTR_WIDTH_32       0
  57 #define AES_REG_CTRL_CTR_WIDTH_64       BIT(7)
  58 #define AES_REG_CTRL_CTR_WIDTH_96       BIT(8)
  59 #define AES_REG_CTRL_CTR_WIDTH_128      GENMASK(8, 7)
  60 #define AES_REG_CTRL_CTR                BIT(6)
  61 #define AES_REG_CTRL_CBC                BIT(5)
  62 #define AES_REG_CTRL_KEY_SIZE           GENMASK(4, 3)
  63 #define AES_REG_CTRL_DIRECTION          BIT(2)
  64 #define AES_REG_CTRL_INPUT_READY        BIT(1)
  65 #define AES_REG_CTRL_OUTPUT_READY       BIT(0)
  66 #define AES_REG_CTRL_MASK               GENMASK(24, 2)
  67
  68 #define AES_REG_DATA_N(dd, x)           ((dd)->pdata->data_ofs + ((x) * 0x04))
  69
  70 #define AES_REG_REV(dd)                 ((dd)->pdata->rev_ofs)
  71
  72 #define AES_REG_MASK(dd)                ((dd)->pdata->mask_ofs)
  73 #define AES_REG_MASK_SIDLE              BIT(6)
  74 #define AES_REG_MASK_START              BIT(5)
  75 #define AES_REG_MASK_DMA_OUT_EN         BIT(3)
  76 #define AES_REG_MASK_DMA_IN_EN          BIT(2)
  77 #define AES_REG_MASK_SOFTRESET          BIT(1)
  78 #define AES_REG_AUTOIDLE                BIT(0)
  79
  80 #define AES_REG_LENGTH_N(x)             (0x54 + ((x) * 0x04))
  81
  82 #define AES_REG_IRQ_STATUS(dd)         ((dd)->pdata->irq_status_ofs)
  83 #define AES_REG_IRQ_ENABLE(dd)         ((dd)->pdata->irq_enable_ofs)
  84 #define AES_REG_IRQ_DATA_IN            BIT(1)
  85 #define AES_REG_IRQ_DATA_OUT           BIT(2)
  86 #define DEFAULT_TIMEOUT         (5*HZ)
  87
  88 #define FLAGS_MODE_MASK         0x000f
  89 #define FLAGS_ENCRYPT           BIT(0)
  90 #define FLAGS_CBC               BIT(1)
  91 #define FLAGS_GIV               BIT(2)
  92 #define FLAGS_CTR               BIT(3)
  93
  94 #define FLAGS_INIT              BIT(4)
  95 #define FLAGS_FAST              BIT(5)
  96 #define FLAGS_BUSY              BIT(6)
  97
  98 #define AES_BLOCK_WORDS         (AES_BLOCK_SIZE >> 2)
  99
 100 struct omap_aes_ctx {
 101         struct omap_aes_dev *dd;
 102
 103         int             keylen;
 104         u32             key[AES_KEYSIZE_256 / sizeof(u32)];
 105         unsigned long   flags;
 106 };
 107
 108 struct omap_aes_reqctx {
 109         unsigned long mode;
 110 };
 111
 112 #define OMAP_AES_QUEUE_LENGTH   1
 113 #define OMAP_AES_CACHE_SIZE     0
 114
 115 struct omap_aes_algs_info {
 116         struct crypto_alg       *algs_list;
 117         unsigned int            size;
 118         unsigned int            registered;
 119 };
 120
 121 struct omap_aes_pdata {
 122         struct omap_aes_algs_info       *algs_info;
 123         unsigned int    algs_info_size;
 124
 125         void            (*trigger)(struct omap_aes_dev *dd, int length);
 126
 127         u32             key_ofs;
 128         u32             iv_ofs;
 129         u32             ctrl_ofs;
 130         u32             data_ofs;
 131         u32             rev_ofs;
 132         u32             mask_ofs;
 133         u32             irq_enable_ofs;
 134         u32             irq_status_ofs;
 135
 136         u32             dma_enable_in;
 137         u32             dma_enable_out;
 138         u32             dma_start;
 139
 140         u32             major_mask;
 141         u32             major_shift;
 142         u32             minor_mask;
 143         u32             minor_shift;
 144 };
 145
 146 struct omap_aes_dev {
 147         struct list_head        list;
 148         unsigned long           phys_base;
 149         void __iomem            *io_base;
 150         struct omap_aes_ctx     *ctx;
 151         struct device           *dev;
 152         unsigned long           flags;
 153         int                     err;
 154
 155         struct tasklet_struct   done_task;
 156
 157         struct ablkcipher_request       *req;
 158         struct crypto_engine            *engine;
 159
 160         /*
 161          * total is used by PIO mode for book keeping so introduce
 162          * variable total_save as need it to calc page_order
 163          */
 164         size_t                          total;
 165         size_t                          total_save;
 166
 167         struct scatterlist              *in_sg;
 168         struct scatterlist              *out_sg;
 169
 170         /* Buffers for copying for unaligned cases */
 171         struct scatterlist              in_sgl;
 172         struct scatterlist              out_sgl;
 173         struct scatterlist              *orig_out;
 174         int                             sgs_copied;
 175
 176         struct scatter_walk             in_walk;
 177         struct scatter_walk             out_walk;
 178         struct dma_chan         *dma_lch_in;
 179         struct dma_chan         *dma_lch_out;
 180         int                     in_sg_len;
 181         int                     out_sg_len;
 182         int                     pio_only;
 183         const struct omap_aes_pdata     *pdata;
 184 };
 185
 186 /* keep registered devices data here */
 187 static LIST_HEAD(dev_list);
 188 static DEFINE_SPINLOCK(list_lock);
 189
 190 #ifdef DEBUG
 191 #define omap_aes_read(dd, offset)                               \
 192 ({                                                              \
 193         int _read_ret;                                          \
 194         _read_ret = __raw_readl(dd->io_base + offset);          \
 195         pr_debug("omap_aes_read(" #offset "=%#x)= %#x\n",       \
 196                  offset, _read_ret);                            \
 197         _read_ret;                                              \
 198 })
 199 #else
 200 static inline u32 omap_aes_read(struct omap_aes_dev *dd, u32 offset)
 201 {
 202         return __raw_readl(dd->io_base + offset);
 203 }
 204 #endif
 205
 206 #ifdef DEBUG
 207 #define omap_aes_write(dd, offset, value)                               \
 208         do {                                                            \
 209                 pr_debug("omap_aes_write(" #offset "=%#x) value=%#x\n", \
 210                          offset, value);                                \
 211                 __raw_writel(value, dd->io_base + offset);              \
 212         } while (0)
 213 #else
 214 static inline void omap_aes_write(struct omap_aes_dev *dd, u32 offset,
 215                                   u32 value)
 216 {
 217         __raw_writel(value, dd->io_base + offset);
 218 }
 219 #endif
 220
 221 static inline void omap_aes_write_mask(struct omap_aes_dev *dd, u32 offset,
 222                                         u32 value, u32 mask)
 223 {
 224         u32 val;
 225
 226         val = omap_aes_read(dd, offset);
 227         val &= ~mask;
 228         val |= value;
 229         omap_aes_write(dd, offset, val);
 230 }
 231
 232 static void omap_aes_write_n(struct omap_aes_dev *dd, u32 offset,
 233                                         u32 *value, int count)
 234 {
 235         for (; count--; value++, offset += 4)
 236                 omap_aes_write(dd, offset, *value);
 237 }
 238
 239 static int omap_aes_hw_init(struct omap_aes_dev *dd)
 240 {
 241         if (!(dd->flags & FLAGS_INIT)) {
 242                 dd->flags |= FLAGS_INIT;
 243                 dd->err = 0;
 244         }
 245
 246         return 0;
 247 }
 248
 249 static int omap_aes_write_ctrl(struct omap_aes_dev *dd)
 250 {
 251         unsigned int key32;
 252         int i, err;
 253         u32 val;
 254
 255         err = omap_aes_hw_init(dd);
 256         if (err)
 257                 return err;
 258
 259         key32 = dd->ctx->keylen / sizeof(u32);
 260
 261         /* it seems a key should always be set even if it has not changed */
 262         for (i = 0; i < key32; i++) {
 263                 omap_aes_write(dd, AES_REG_KEY(dd, i),
 264                         __le32_to_cpu(dd->ctx->key[i]));
 265         }
 266
 267         if ((dd->flags & (FLAGS_CBC | FLAGS_CTR)) && dd->req->info)
 268                 omap_aes_write_n(dd, AES_REG_IV(dd, 0), dd->req->info, 4);
 269
 270         val = FLD_VAL(((dd->ctx->keylen >> 3) - 1), 4, 3);
 271         if (dd->flags & FLAGS_CBC)
 272                 val |= AES_REG_CTRL_CBC;
 273         if (dd->flags & FLAGS_CTR)
 274                 val |= AES_REG_CTRL_CTR | AES_REG_CTRL_CTR_WIDTH_128;
 275
 276         if (dd->flags & FLAGS_ENCRYPT)
 277                 val |= AES_REG_CTRL_DIRECTION;
 278
 279         omap_aes_write_mask(dd, AES_REG_CTRL(dd), val, AES_REG_CTRL_MASK);
 280
 281         return 0;
 282 }
 283
 284 static void omap_aes_dma_trigger_omap2(struct omap_aes_dev *dd, int length)
 285 {
 286         u32 mask, val;
 287
 288         val = dd->pdata->dma_start;
 289
 290         if (dd->dma_lch_out != NULL)
 291                 val |= dd->pdata->dma_enable_out;
 292         if (dd->dma_lch_in != NULL)
 293                 val |= dd->pdata->dma_enable_in;
 294
 295         mask = dd->pdata->dma_enable_out | dd->pdata->dma_enable_in |
 296                dd->pdata->dma_start;
 297
 298         omap_aes_write_mask(dd, AES_REG_MASK(dd), val, mask);
 299
 300 }
 301
 302 static void omap_aes_dma_trigger_omap4(struct omap_aes_dev *dd, int length)
 303 {
 304         omap_aes_write(dd, AES_REG_LENGTH_N(0), length);
 305         omap_aes_write(dd, AES_REG_LENGTH_N(1), 0);
 306
 307         omap_aes_dma_trigger_omap2(dd, length);
 308 }
 309
 310 static void omap_aes_dma_stop(struct omap_aes_dev *dd)
 311 {
 312         u32 mask;
 313
 314         mask = dd->pdata->dma_enable_out | dd->pdata->dma_enable_in |
 315                dd->pdata->dma_start;
 316
 317         omap_aes_write_mask(dd, AES_REG_MASK(dd), 0, mask);
 318 }
 319
 320 static struct omap_aes_dev *omap_aes_find_dev(struct omap_aes_ctx *ctx)
 321 {
 322         struct omap_aes_dev *dd = NULL, *tmp;
 323
 324         spin_lock_bh(&list_lock);
 325         if (!ctx->dd) {
 326                 list_for_each_entry(tmp, &dev_list, list) {
 327                         /* FIXME: take fist available aes core */
 328                         dd = tmp;
 329                         break;
 330                 }
 331                 ctx->dd = dd;
 332         } else {
 333                 /* already found before */
 334                 dd = ctx->dd;
 335         }
 336         spin_unlock_bh(&list_lock);
 337
 338         return dd;
 339 }
 340
 341 static void omap_aes_dma_out_callback(void *data)
 342 {
 343         struct omap_aes_dev *dd = data;
 344
 345         /* dma_lch_out - completed */
 346         tasklet_schedule(&dd->done_task);
 347 }
 348
 349 static int omap_aes_dma_init(struct omap_aes_dev *dd)
 350 {
 351         int err;
 352
 353         dd->dma_lch_out = NULL;
 354         dd->dma_lch_in = NULL;
 355
 356         dd->dma_lch_in = dma_request_chan(dd->dev, "rx");
 357         if (IS_ERR(dd->dma_lch_in)) {
 358                 dev_err(dd->dev, "Unable to request in DMA channel\n");
 359                 return PTR_ERR(dd->dma_lch_in);
 360         }
 361
 362         dd->dma_lch_out = dma_request_chan(dd->dev, "tx");
 363         if (IS_ERR(dd->dma_lch_out)) {
 364                 dev_err(dd->dev, "Unable to request out DMA channel\n");
 365                 err = PTR_ERR(dd->dma_lch_out);
 366                 goto err_dma_out;
 367         }
 368
 369         return 0;
 370
 371 err_dma_out:
 372         dma_release_channel(dd->dma_lch_in);
 373
 374         return err;
 375 }
 376
 377 static void omap_aes_dma_cleanup(struct omap_aes_dev *dd)
 378 {
 379         if (dd->pio_only)
 380                 return;
 381
 382         dma_release_channel(dd->dma_lch_out);
 383         dma_release_channel(dd->dma_lch_in);
 384 }
 385
 386 static void sg_copy_buf(void *buf, struct scatterlist *sg,
 387                               unsigned int start, unsigned int nbytes, int out)
 388 {
 389         struct scatter_walk walk;
 390
 391         if (!nbytes)
 392                 return;
 393
 394         scatterwalk_start(&walk, sg);
 395         scatterwalk_advance(&walk, start);
 396         scatterwalk_copychunks(buf, &walk, nbytes, out);
 397         scatterwalk_done(&walk, out, 0);
 398 }
 399
 400 static int omap_aes_crypt_dma(struct crypto_tfm *tfm,
 401                 struct scatterlist *in_sg, struct scatterlist *out_sg,
 402                 int in_sg_len, int out_sg_len)
 403 {
 404         struct omap_aes_ctx *ctx = crypto_tfm_ctx(tfm);
 405         struct omap_aes_dev *dd = ctx->dd;
 406         struct dma_async_tx_descriptor *tx_in, *tx_out;
 407         struct dma_slave_config cfg;
 408         int ret;
 409
 410         if (dd->pio_only) {
 411                 scatterwalk_start(&dd->in_walk, dd->in_sg);
 412                 scatterwalk_start(&dd->out_walk, dd->out_sg);
 413
 414                 /* Enable DATAIN interrupt and let it take
 415                    care of the rest */
 416                 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x2);
 417                 return 0;
 418         }
 419
 420         dma_sync_sg_for_device(dd->dev, dd->in_sg, in_sg_len, DMA_TO_DEVICE);
 421
 422         memset(&cfg, 0, sizeof(cfg));
 423
 424         cfg.src_addr = dd->phys_base + AES_REG_DATA_N(dd, 0);
 425         cfg.dst_addr = dd->phys_base + AES_REG_DATA_N(dd, 0);
 426         cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 427         cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 428         cfg.src_maxburst = DST_MAXBURST;
 429         cfg.dst_maxburst = DST_MAXBURST;
 430
 431         /* IN */
 432         ret = dmaengine_slave_config(dd->dma_lch_in, &cfg);
 433         if (ret) {
 434                 dev_err(dd->dev, "can't configure IN dmaengine slave: %d\n",
 435                         ret);
 436                 return ret;
 437         }
 438
 439         tx_in = dmaengine_prep_slave_sg(dd->dma_lch_in, in_sg, in_sg_len,
 440                                         DMA_MEM_TO_DEV,
 441                                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 442         if (!tx_in) {
 443                 dev_err(dd->dev, "IN prep_slave_sg() failed\n");
 444                 return -EINVAL;
 445         }
 446
 447         /* No callback necessary */
 448         tx_in->callback_param = dd;
 449
 450         /* OUT */
 451         ret = dmaengine_slave_config(dd->dma_lch_out, &cfg);
 452         if (ret) {
 453                 dev_err(dd->dev, "can't configure OUT dmaengine slave: %d\n",
 454                         ret);
 455                 return ret;
 456         }
 457
 458         tx_out = dmaengine_prep_slave_sg(dd->dma_lch_out, out_sg, out_sg_len,
 459                                         DMA_DEV_TO_MEM,
 460                                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 461         if (!tx_out) {
 462                 dev_err(dd->dev, "OUT prep_slave_sg() failed\n");
 463                 return -EINVAL;
 464         }
 465
 466         tx_out->callback = omap_aes_dma_out_callback;
 467         tx_out->callback_param = dd;
 468
 469         dmaengine_submit(tx_in);
 470         dmaengine_submit(tx_out);
 471
 472         dma_async_issue_pending(dd->dma_lch_in);
 473         dma_async_issue_pending(dd->dma_lch_out);
 474
 475         /* start DMA */
 476         dd->pdata->trigger(dd, dd->total);
 477
 478         return 0;
 479 }
 480
 481 static int omap_aes_crypt_dma_start(struct omap_aes_dev *dd)
 482 {
 483         struct crypto_tfm *tfm = crypto_ablkcipher_tfm(
 484                                         crypto_ablkcipher_reqtfm(dd->req));
 485         int err;
 486
 487         pr_debug("total: %d\n", dd->total);
 488
 489         if (!dd->pio_only) {
 490                 err = dma_map_sg(dd->dev, dd->in_sg, dd->in_sg_len,
 491                                  DMA_TO_DEVICE);
 492                 if (!err) {
 493                         dev_err(dd->dev, "dma_map_sg() error\n");
 494                         return -EINVAL;
 495                 }
 496
 497                 err = dma_map_sg(dd->dev, dd->out_sg, dd->out_sg_len,
 498                                  DMA_FROM_DEVICE);
 499                 if (!err) {
 500                         dev_err(dd->dev, "dma_map_sg() error\n");
 501                         return -EINVAL;
 502                 }
 503         }
 504
 505         err = omap_aes_crypt_dma(tfm, dd->in_sg, dd->out_sg, dd->in_sg_len,
 506                                  dd->out_sg_len);
 507         if (err && !dd->pio_only) {
 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         }
 512
 513         return err;
 514 }
 515
 516 static void omap_aes_finish_req(struct omap_aes_dev *dd, int err)
 517 {
 518         struct ablkcipher_request *req = dd->req;
 519
 520         pr_debug("err: %d\n", err);
 521
 522         crypto_finalize_request(dd->engine, req, err);
 523 }
 524
 525 static int omap_aes_crypt_dma_stop(struct omap_aes_dev *dd)
 526 {
 527         pr_debug("total: %d\n", dd->total);
 528
 529         omap_aes_dma_stop(dd);
 530
 531
 532         return 0;
 533 }
 534
 535 static int omap_aes_check_aligned(struct scatterlist *sg, int total)
 536 {
 537         int len = 0;
 538
 539         if (!IS_ALIGNED(total, AES_BLOCK_SIZE))
 540                 return -EINVAL;
 541
 542         while (sg) {
 543                 if (!IS_ALIGNED(sg->offset, 4))
 544                         return -1;
 545                 if (!IS_ALIGNED(sg->length, AES_BLOCK_SIZE))
 546                         return -1;
 547
 548                 len += sg->length;
 549                 sg = sg_next(sg);
 550         }
 551
 552         if (len != total)
 553                 return -1;
 554
 555         return 0;
 556 }
 557
 558 static int omap_aes_copy_sgs(struct omap_aes_dev *dd)
 559 {
 560         void *buf_in, *buf_out;
 561         int pages, total;
 562
 563         total = ALIGN(dd->total, AES_BLOCK_SIZE);
 564         pages = get_order(total);
 565
 566         buf_in = (void *)__get_free_pages(GFP_ATOMIC, pages);
 567         buf_out = (void *)__get_free_pages(GFP_ATOMIC, pages);
 568
 569         if (!buf_in || !buf_out) {
 570                 pr_err("Couldn't allocated pages for unaligned cases.\n");
 571                 return -1;
 572         }
 573
 574         dd->orig_out = dd->out_sg;
 575
 576         sg_copy_buf(buf_in, dd->in_sg, 0, dd->total, 0);
 577
 578         sg_init_table(&dd->in_sgl, 1);
 579         sg_set_buf(&dd->in_sgl, buf_in, total);
 580         dd->in_sg = &dd->in_sgl;
 581         dd->in_sg_len = 1;
 582
 583         sg_init_table(&dd->out_sgl, 1);
 584         sg_set_buf(&dd->out_sgl, buf_out, total);
 585         dd->out_sg = &dd->out_sgl;
 586         dd->out_sg_len = 1;
 587
 588         return 0;
 589 }
 590
 591 static int omap_aes_handle_queue(struct omap_aes_dev *dd,
 592                                  struct ablkcipher_request *req)
 593 {
 594         if (req)
 595                 return crypto_transfer_request_to_engine(dd->engine, req);
 596
 597         return 0;
 598 }
 599
 600 static int omap_aes_prepare_req(struct crypto_engine *engine,
 601                                 struct ablkcipher_request *req)
 602 {
 603         struct omap_aes_ctx *ctx = crypto_ablkcipher_ctx(
 604                         crypto_ablkcipher_reqtfm(req));
 605         struct omap_aes_dev *dd = omap_aes_find_dev(ctx);
 606         struct omap_aes_reqctx *rctx;
 607
 608         if (!dd)
 609                 return -ENODEV;
 610
 611         /* assign new request to device */
 612         dd->req = req;
 613         dd->total = req->nbytes;
 614         dd->total_save = req->nbytes;
 615         dd->in_sg = req->src;
 616         dd->out_sg = req->dst;
 617
 618         dd->in_sg_len = sg_nents_for_len(dd->in_sg, dd->total);
 619         if (dd->in_sg_len < 0)
 620                 return dd->in_sg_len;
 621
 622         dd->out_sg_len = sg_nents_for_len(dd->out_sg, dd->total);
 623         if (dd->out_sg_len < 0)
 624                 return dd->out_sg_len;
 625
 626         if (omap_aes_check_aligned(dd->in_sg, dd->total) ||
 627             omap_aes_check_aligned(dd->out_sg, dd->total)) {
 628                 if (omap_aes_copy_sgs(dd))
 629                         pr_err("Failed to copy SGs for unaligned cases\n");
 630                 dd->sgs_copied = 1;
 631         } else {
 632                 dd->sgs_copied = 0;
 633         }
 634
 635         rctx = ablkcipher_request_ctx(req);
 636         ctx = crypto_ablkcipher_ctx(crypto_ablkcipher_reqtfm(req));
 637         rctx->mode &= FLAGS_MODE_MASK;
 638         dd->flags = (dd->flags & ~FLAGS_MODE_MASK) | rctx->mode;
 639
 640         dd->ctx = ctx;
 641         ctx->dd = dd;
 642
 643         return omap_aes_write_ctrl(dd);
 644 }
 645
 646 static int omap_aes_crypt_req(struct crypto_engine *engine,
 647                               struct ablkcipher_request *req)
 648 {
 649         struct omap_aes_ctx *ctx = crypto_ablkcipher_ctx(
 650                         crypto_ablkcipher_reqtfm(req));
 651         struct omap_aes_dev *dd = omap_aes_find_dev(ctx);
 652
 653         if (!dd)
 654                 return -ENODEV;
 655
 656         return omap_aes_crypt_dma_start(dd);
 657 }
 658
 659 static void omap_aes_done_task(unsigned long data)
 660 {
 661         struct omap_aes_dev *dd = (struct omap_aes_dev *)data;
 662         void *buf_in, *buf_out;
 663         int pages, len;
 664
 665         pr_debug("enter done_task\n");
 666
 667         if (!dd->pio_only) {
 668                 dma_sync_sg_for_device(dd->dev, dd->out_sg, dd->out_sg_len,
 669                                        DMA_FROM_DEVICE);
 670                 dma_unmap_sg(dd->dev, dd->in_sg, dd->in_sg_len, DMA_TO_DEVICE);
 671                 dma_unmap_sg(dd->dev, dd->out_sg, dd->out_sg_len,
 672                              DMA_FROM_DEVICE);
 673                 omap_aes_crypt_dma_stop(dd);
 674         }
 675
 676         if (dd->sgs_copied) {
 677                 buf_in = sg_virt(&dd->in_sgl);
 678                 buf_out = sg_virt(&dd->out_sgl);
 679
 680                 sg_copy_buf(buf_out, dd->orig_out, 0, dd->total_save, 1);
 681
 682                 len = ALIGN(dd->total_save, AES_BLOCK_SIZE);
 683                 pages = get_order(len);
 684                 free_pages((unsigned long)buf_in, pages);
 685                 free_pages((unsigned long)buf_out, pages);
 686         }
 687
 688         omap_aes_finish_req(dd, 0);
 689
 690         pr_debug("exit\n");
 691 }
 692
 693 static int omap_aes_crypt(struct ablkcipher_request *req, unsigned long mode)
 694 {
 695         struct omap_aes_ctx *ctx = crypto_ablkcipher_ctx(
 696                         crypto_ablkcipher_reqtfm(req));
 697         struct omap_aes_reqctx *rctx = ablkcipher_request_ctx(req);
 698         struct omap_aes_dev *dd;
 699
 700         pr_debug("nbytes: %d, enc: %d, cbc: %d\n", req->nbytes,
 701                   !!(mode & FLAGS_ENCRYPT),
 702                   !!(mode & FLAGS_CBC));
 703
 704         dd = omap_aes_find_dev(ctx);
 705         if (!dd)
 706                 return -ENODEV;
 707
 708         rctx->mode = mode;
 709
 710         return omap_aes_handle_queue(dd, req);
 711 }
 712
 713 /* ********************** ALG API ************************************ */
 714
 715 static int omap_aes_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
 716                            unsigned int keylen)
 717 {
 718         struct omap_aes_ctx *ctx = crypto_ablkcipher_ctx(tfm);
 719
 720         if (keylen != AES_KEYSIZE_128 && keylen != AES_KEYSIZE_192 &&
 721                    keylen != AES_KEYSIZE_256)
 722                 return -EINVAL;
 723
 724         pr_debug("enter, keylen: %d\n", keylen);
 725
 726         memcpy(ctx->key, key, keylen);
 727         ctx->keylen = keylen;
 728
 729         return 0;
 730 }
 731
 732 static int omap_aes_ecb_encrypt(struct ablkcipher_request *req)
 733 {
 734         return omap_aes_crypt(req, FLAGS_ENCRYPT);
 735 }
 736
 737 static int omap_aes_ecb_decrypt(struct ablkcipher_request *req)
 738 {
 739         return omap_aes_crypt(req, 0);
 740 }
 741
 742 static int omap_aes_cbc_encrypt(struct ablkcipher_request *req)
 743 {
 744         return omap_aes_crypt(req, FLAGS_ENCRYPT | FLAGS_CBC);
 745 }
 746
 747 static int omap_aes_cbc_decrypt(struct ablkcipher_request *req)
 748 {
 749         return omap_aes_crypt(req, FLAGS_CBC);
 750 }
 751
 752 static int omap_aes_ctr_encrypt(struct ablkcipher_request *req)
 753 {
 754         return omap_aes_crypt(req, FLAGS_ENCRYPT | FLAGS_CTR);
 755 }
 756
 757 static int omap_aes_ctr_decrypt(struct ablkcipher_request *req)
 758 {
 759         return omap_aes_crypt(req, FLAGS_CTR);
 760 }
 761
 762 static int omap_aes_cra_init(struct crypto_tfm *tfm)
 763 {
 764         struct omap_aes_dev *dd = NULL;
 765         int err;
 766
 767         /* Find AES device, currently picks the first device */
 768         spin_lock_bh(&list_lock);
 769         list_for_each_entry(dd, &dev_list, list) {
 770                 break;
 771         }
 772         spin_unlock_bh(&list_lock);
 773
 774         err = pm_runtime_get_sync(dd->dev);
 775         if (err < 0) {
 776                 dev_err(dd->dev, "%s: failed to get_sync(%d)\n",
 777                         __func__, err);
 778                 return err;
 779         }
 780
 781         tfm->crt_ablkcipher.reqsize = sizeof(struct omap_aes_reqctx);
 782
 783         return 0;
 784 }
 785
 786 static void omap_aes_cra_exit(struct crypto_tfm *tfm)
 787 {
 788         struct omap_aes_dev *dd = NULL;
 789
 790         /* Find AES device, currently picks the first device */
 791         spin_lock_bh(&list_lock);
 792         list_for_each_entry(dd, &dev_list, list) {
 793                 break;
 794         }
 795         spin_unlock_bh(&list_lock);
 796
 797         pm_runtime_put_sync(dd->dev);
 798 }
 799
 800 /* ********************** ALGS ************************************ */
 801
 802 static struct crypto_alg algs_ecb_cbc[] = {
 803 {
 804         .cra_name               = "ecb(aes)",
 805         .cra_driver_name        = "ecb-aes-omap",
 806         .cra_priority           = 300,
 807         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER |
 808                                   CRYPTO_ALG_KERN_DRIVER_ONLY |
 809                                   CRYPTO_ALG_ASYNC,
 810         .cra_blocksize          = AES_BLOCK_SIZE,
 811         .cra_ctxsize            = sizeof(struct omap_aes_ctx),
 812         .cra_alignmask          = 0,
 813         .cra_type               = &crypto_ablkcipher_type,
 814         .cra_module             = THIS_MODULE,
 815         .cra_init               = omap_aes_cra_init,
 816         .cra_exit               = omap_aes_cra_exit,
 817         .cra_u.ablkcipher = {
 818                 .min_keysize    = AES_MIN_KEY_SIZE,
 819                 .max_keysize    = AES_MAX_KEY_SIZE,
 820                 .setkey         = omap_aes_setkey,
 821                 .encrypt        = omap_aes_ecb_encrypt,
 822                 .decrypt        = omap_aes_ecb_decrypt,
 823         }
 824 },
 825 {
 826         .cra_name               = "cbc(aes)",
 827         .cra_driver_name        = "cbc-aes-omap",
 828         .cra_priority           = 300,
 829         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER |
 830                                   CRYPTO_ALG_KERN_DRIVER_ONLY |
 831                                   CRYPTO_ALG_ASYNC,
 832         .cra_blocksize          = AES_BLOCK_SIZE,
 833         .cra_ctxsize            = sizeof(struct omap_aes_ctx),
 834         .cra_alignmask          = 0,
 835         .cra_type               = &crypto_ablkcipher_type,
 836         .cra_module             = THIS_MODULE,
 837         .cra_init               = omap_aes_cra_init,
 838         .cra_exit               = omap_aes_cra_exit,
 839         .cra_u.ablkcipher = {
 840                 .min_keysize    = AES_MIN_KEY_SIZE,
 841                 .max_keysize    = AES_MAX_KEY_SIZE,
 842                 .ivsize         = AES_BLOCK_SIZE,
 843                 .setkey         = omap_aes_setkey,
 844                 .encrypt        = omap_aes_cbc_encrypt,
 845                 .decrypt        = omap_aes_cbc_decrypt,
 846         }
 847 }
 848 };
 849
 850 static struct crypto_alg algs_ctr[] = {
 851 {
 852         .cra_name               = "ctr(aes)",
 853         .cra_driver_name        = "ctr-aes-omap",
 854         .cra_priority           = 300,
 855         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER |
 856                                   CRYPTO_ALG_KERN_DRIVER_ONLY |
 857                                   CRYPTO_ALG_ASYNC,
 858         .cra_blocksize          = AES_BLOCK_SIZE,
 859         .cra_ctxsize            = sizeof(struct omap_aes_ctx),
 860         .cra_alignmask          = 0,
 861         .cra_type               = &crypto_ablkcipher_type,
 862         .cra_module             = THIS_MODULE,
 863         .cra_init               = omap_aes_cra_init,
 864         .cra_exit               = omap_aes_cra_exit,
 865         .cra_u.ablkcipher = {
 866                 .min_keysize    = AES_MIN_KEY_SIZE,
 867                 .max_keysize    = AES_MAX_KEY_SIZE,
 868                 .geniv          = "eseqiv",
 869                 .ivsize         = AES_BLOCK_SIZE,
 870                 .setkey         = omap_aes_setkey,
 871                 .encrypt        = omap_aes_ctr_encrypt,
 872                 .decrypt        = omap_aes_ctr_decrypt,
 873         }
 874 } ,
 875 };
 876
 877 static struct omap_aes_algs_info omap_aes_algs_info_ecb_cbc[] = {
 878         {
 879                 .algs_list      = algs_ecb_cbc,
 880                 .size           = ARRAY_SIZE(algs_ecb_cbc),
 881         },
 882 };
 883
 884 static const struct omap_aes_pdata omap_aes_pdata_omap2 = {
 885         .algs_info      = omap_aes_algs_info_ecb_cbc,
 886         .algs_info_size = ARRAY_SIZE(omap_aes_algs_info_ecb_cbc),
 887         .trigger        = omap_aes_dma_trigger_omap2,
 888         .key_ofs        = 0x1c,
 889         .iv_ofs         = 0x20,
 890         .ctrl_ofs       = 0x30,
 891         .data_ofs       = 0x34,
 892         .rev_ofs        = 0x44,
 893         .mask_ofs       = 0x48,
 894         .dma_enable_in  = BIT(2),
 895         .dma_enable_out = BIT(3),
 896         .dma_start      = BIT(5),
 897         .major_mask     = 0xf0,
 898         .major_shift    = 4,
 899         .minor_mask     = 0x0f,
 900         .minor_shift    = 0,
 901 };
 902
 903 #ifdef CONFIG_OF
 904 static struct omap_aes_algs_info omap_aes_algs_info_ecb_cbc_ctr[] = {
 905         {
 906                 .algs_list      = algs_ecb_cbc,
 907                 .size           = ARRAY_SIZE(algs_ecb_cbc),
 908         },
 909         {
 910                 .algs_list      = algs_ctr,
 911                 .size           = ARRAY_SIZE(algs_ctr),
 912         },
 913 };
 914
 915 static const struct omap_aes_pdata omap_aes_pdata_omap3 = {
 916         .algs_info      = omap_aes_algs_info_ecb_cbc_ctr,
 917         .algs_info_size = ARRAY_SIZE(omap_aes_algs_info_ecb_cbc_ctr),
 918         .trigger        = omap_aes_dma_trigger_omap2,
 919         .key_ofs        = 0x1c,
 920         .iv_ofs         = 0x20,
 921         .ctrl_ofs       = 0x30,
 922         .data_ofs       = 0x34,
 923         .rev_ofs        = 0x44,
 924         .mask_ofs       = 0x48,
 925         .dma_enable_in  = BIT(2),
 926         .dma_enable_out = BIT(3),
 927         .dma_start      = BIT(5),
 928         .major_mask     = 0xf0,
 929         .major_shift    = 4,
 930         .minor_mask     = 0x0f,
 931         .minor_shift    = 0,
 932 };
 933
 934 static const struct omap_aes_pdata omap_aes_pdata_omap4 = {
 935         .algs_info      = omap_aes_algs_info_ecb_cbc_ctr,
 936         .algs_info_size = ARRAY_SIZE(omap_aes_algs_info_ecb_cbc_ctr),
 937         .trigger        = omap_aes_dma_trigger_omap4,
 938         .key_ofs        = 0x3c,
 939         .iv_ofs         = 0x40,
 940         .ctrl_ofs       = 0x50,
 941         .data_ofs       = 0x60,
 942         .rev_ofs        = 0x80,
 943         .mask_ofs       = 0x84,
 944         .irq_status_ofs = 0x8c,
 945         .irq_enable_ofs = 0x90,
 946         .dma_enable_in  = BIT(5),
 947         .dma_enable_out = BIT(6),
 948         .major_mask     = 0x0700,
 949         .major_shift    = 8,
 950         .minor_mask     = 0x003f,
 951         .minor_shift    = 0,
 952 };
 953
 954 static irqreturn_t omap_aes_irq(int irq, void *dev_id)
 955 {
 956         struct omap_aes_dev *dd = dev_id;
 957         u32 status, i;
 958         u32 *src, *dst;
 959
 960         status = omap_aes_read(dd, AES_REG_IRQ_STATUS(dd));
 961         if (status & AES_REG_IRQ_DATA_IN) {
 962                 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x0);
 963
 964                 BUG_ON(!dd->in_sg);
 965
 966                 BUG_ON(_calc_walked(in) > dd->in_sg->length);
 967
 968                 src = sg_virt(dd->in_sg) + _calc_walked(in);
 969
 970                 for (i = 0; i < AES_BLOCK_WORDS; i++) {
 971                         omap_aes_write(dd, AES_REG_DATA_N(dd, i), *src);
 972
 973                         scatterwalk_advance(&dd->in_walk, 4);
 974                         if (dd->in_sg->length == _calc_walked(in)) {
 975                                 dd->in_sg = sg_next(dd->in_sg);
 976                                 if (dd->in_sg) {
 977                                         scatterwalk_start(&dd->in_walk,
 978                                                           dd->in_sg);
 979                                         src = sg_virt(dd->in_sg) +
 980                                               _calc_walked(in);
 981                                 }
 982                         } else {
 983                                 src++;
 984                         }
 985                 }
 986
 987                 /* Clear IRQ status */
 988                 status &= ~AES_REG_IRQ_DATA_IN;
 989                 omap_aes_write(dd, AES_REG_IRQ_STATUS(dd), status);
 990
 991                 /* Enable DATA_OUT interrupt */
 992                 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x4);
 993
 994         } else if (status & AES_REG_IRQ_DATA_OUT) {
 995                 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x0);
 996
 997                 BUG_ON(!dd->out_sg);
 998
 999                 BUG_ON(_calc_walked(out) > dd->out_sg->length);
1000
1001                 dst = sg_virt(dd->out_sg) + _calc_walked(out);
1002
1003                 for (i = 0; i < AES_BLOCK_WORDS; i++) {
1004                         *dst = omap_aes_read(dd, AES_REG_DATA_N(dd, i));
1005                         scatterwalk_advance(&dd->out_walk, 4);
1006                         if (dd->out_sg->length == _calc_walked(out)) {
1007                                 dd->out_sg = sg_next(dd->out_sg);
1008                                 if (dd->out_sg) {
1009                                         scatterwalk_start(&dd->out_walk,
1010                                                           dd->out_sg);
1011                                         dst = sg_virt(dd->out_sg) +
1012                                               _calc_walked(out);
1013                                 }
1014                         } else {
1015                                 dst++;
1016                         }
1017                 }
1018
1019                 dd->total -= min_t(size_t, AES_BLOCK_SIZE, dd->total);
1020
1021                 /* Clear IRQ status */
1022                 status &= ~AES_REG_IRQ_DATA_OUT;
1023                 omap_aes_write(dd, AES_REG_IRQ_STATUS(dd), status);
1024
1025                 if (!dd->total)
1026                         /* All bytes read! */
1027                         tasklet_schedule(&dd->done_task);
1028                 else
1029                         /* Enable DATA_IN interrupt for next block */
1030                         omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x2);
1031         }
1032
1033         return IRQ_HANDLED;
1034 }
1035
1036 static const struct of_device_id omap_aes_of_match[] = {
1037         {
1038                 .compatible     = "ti,omap2-aes",
1039                 .data           = &omap_aes_pdata_omap2,
1040         },
1041         {
1042                 .compatible     = "ti,omap3-aes",
1043                 .data           = &omap_aes_pdata_omap3,
1044         },
1045         {
1046                 .compatible     = "ti,omap4-aes",
1047                 .data           = &omap_aes_pdata_omap4,
1048         },
1049         {},
1050 };
1051 MODULE_DEVICE_TABLE(of, omap_aes_of_match);
1052
1053 static int omap_aes_get_res_of(struct omap_aes_dev *dd,
1054                 struct device *dev, struct resource *res)
1055 {
1056         struct device_node *node = dev->of_node;
1057         const struct of_device_id *match;
1058         int err = 0;
1059
1060         match = of_match_device(of_match_ptr(omap_aes_of_match), dev);
1061         if (!match) {
1062                 dev_err(dev, "no compatible OF match\n");
1063                 err = -EINVAL;
1064                 goto err;
1065         }
1066
1067         err = of_address_to_resource(node, 0, res);
1068         if (err < 0) {
1069                 dev_err(dev, "can't translate OF node address\n");
1070                 err = -EINVAL;
1071                 goto err;
1072         }
1073
1074         dd->pdata = match->data;
1075
1076 err:
1077         return err;
1078 }
1079 #else
1080 static const struct of_device_id omap_aes_of_match[] = {
1081         {},
1082 };
1083
1084 static int omap_aes_get_res_of(struct omap_aes_dev *dd,
1085                 struct device *dev, struct resource *res)
1086 {
1087         return -EINVAL;
1088 }
1089 #endif
1090
1091 static int omap_aes_get_res_pdev(struct omap_aes_dev *dd,
1092                 struct platform_device *pdev, struct resource *res)
1093 {
1094         struct device *dev = &pdev->dev;
1095         struct resource *r;
1096         int err = 0;
1097
1098         /* Get the base address */
1099         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1100         if (!r) {
1101                 dev_err(dev, "no MEM resource info\n");
1102                 err = -ENODEV;
1103                 goto err;
1104         }
1105         memcpy(res, r, sizeof(*res));
1106
1107         /* Only OMAP2/3 can be non-DT */
1108         dd->pdata = &omap_aes_pdata_omap2;
1109
1110 err:
1111         return err;
1112 }
1113
1114 static int omap_aes_probe(struct platform_device *pdev)
1115 {
1116         struct device *dev = &pdev->dev;
1117         struct omap_aes_dev *dd;
1118         struct crypto_alg *algp;
1119         struct resource res;
1120         int err = -ENOMEM, i, j, irq = -1;
1121         u32 reg;
1122
1123         dd = devm_kzalloc(dev, sizeof(struct omap_aes_dev), GFP_KERNEL);
1124         if (dd == NULL) {
1125                 dev_err(dev, "unable to alloc data struct.\n");
1126                 goto err_data;
1127         }
1128         dd->dev = dev;
1129         platform_set_drvdata(pdev, dd);
1130
1131         err = (dev->of_node) ? omap_aes_get_res_of(dd, dev, &res) :
1132                                omap_aes_get_res_pdev(dd, pdev, &res);
1133         if (err)
1134                 goto err_res;
1135
1136         dd->io_base = devm_ioremap_resource(dev, &res);
1137         if (IS_ERR(dd->io_base)) {
1138                 err = PTR_ERR(dd->io_base);
1139                 goto err_res;
1140         }
1141         dd->phys_base = res.start;
1142
1143         pm_runtime_enable(dev);
1144         err = pm_runtime_get_sync(dev);
1145         if (err < 0) {
1146                 dev_err(dev, "%s: failed to get_sync(%d)\n",
1147                         __func__, err);
1148                 goto err_res;
1149         }
1150
1151         omap_aes_dma_stop(dd);
1152
1153         reg = omap_aes_read(dd, AES_REG_REV(dd));
1154
1155         pm_runtime_put_sync(dev);
1156
1157         dev_info(dev, "OMAP AES hw accel rev: %u.%u\n",
1158                  (reg & dd->pdata->major_mask) >> dd->pdata->major_shift,
1159                  (reg & dd->pdata->minor_mask) >> dd->pdata->minor_shift);
1160
1161         tasklet_init(&dd->done_task, omap_aes_done_task, (unsigned long)dd);
1162
1163         err = omap_aes_dma_init(dd);
1164         if (err == -EPROBE_DEFER) {
1165                 goto err_irq;
1166         } else if (err && AES_REG_IRQ_STATUS(dd) && AES_REG_IRQ_ENABLE(dd)) {
1167                 dd->pio_only = 1;
1168
1169                 irq = platform_get_irq(pdev, 0);
1170                 if (irq < 0) {
1171                         dev_err(dev, "can't get IRQ resource\n");
1172                         goto err_irq;
1173                 }
1174
1175                 err = devm_request_irq(dev, irq, omap_aes_irq, 0,
1176                                 dev_name(dev), dd);
1177                 if (err) {
1178                         dev_err(dev, "Unable to grab omap-aes IRQ\n");
1179                         goto err_irq;
1180                 }
1181         }
1182
1183
1184         INIT_LIST_HEAD(&dd->list);
1185         spin_lock(&list_lock);
1186         list_add_tail(&dd->list, &dev_list);
1187         spin_unlock(&list_lock);
1188
1189         for (i = 0; i < dd->pdata->algs_info_size; i++) {
1190                 if (!dd->pdata->algs_info[i].registered) {
1191                         for (j = 0; j < dd->pdata->algs_info[i].size; j++) {
1192                                 algp = &dd->pdata->algs_info[i].algs_list[j];
1193
1194                                 pr_debug("reg alg: %s\n", algp->cra_name);
1195                                 INIT_LIST_HEAD(&algp->cra_list);
1196
1197                                 err = crypto_register_alg(algp);
1198                                 if (err)
1199                                         goto err_algs;
1200
1201                                 dd->pdata->algs_info[i].registered++;
1202                         }
1203                 }
1204         }
1205
1206         /* Initialize crypto engine */
1207         dd->engine = crypto_engine_alloc_init(dev, 1);
1208         if (!dd->engine)
1209                 goto err_algs;
1210
1211         dd->engine->prepare_request = omap_aes_prepare_req;
1212         dd->engine->crypt_one_request = omap_aes_crypt_req;
1213         err = crypto_engine_start(dd->engine);
1214         if (err)
1215                 goto err_engine;
1216
1217         return 0;
1218 err_engine:
1219         crypto_engine_exit(dd->engine);
1220 err_algs:
1221         for (i = dd->pdata->algs_info_size - 1; i >= 0; i--)
1222                 for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--)
1223                         crypto_unregister_alg(
1224                                         &dd->pdata->algs_info[i].algs_list[j]);
1225
1226         omap_aes_dma_cleanup(dd);
1227 err_irq:
1228         tasklet_kill(&dd->done_task);
1229         pm_runtime_disable(dev);
1230 err_res:
1231         dd = NULL;
1232 err_data:
1233         dev_err(dev, "initialization failed.\n");
1234         return err;
1235 }
1236
1237 static int omap_aes_remove(struct platform_device *pdev)
1238 {
1239         struct omap_aes_dev *dd = platform_get_drvdata(pdev);
1240         int i, j;
1241
1242         if (!dd)
1243                 return -ENODEV;
1244
1245         spin_lock(&list_lock);
1246         list_del(&dd->list);
1247         spin_unlock(&list_lock);
1248
1249         for (i = dd->pdata->algs_info_size - 1; i >= 0; i--)
1250                 for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--)
1251                         crypto_unregister_alg(
1252                                         &dd->pdata->algs_info[i].algs_list[j]);
1253
1254         crypto_engine_exit(dd->engine);
1255         tasklet_kill(&dd->done_task);
1256         omap_aes_dma_cleanup(dd);
1257         pm_runtime_disable(dd->dev);
1258         dd = NULL;
1259
1260         return 0;
1261 }
1262
1263 #ifdef CONFIG_PM_SLEEP
1264 static int omap_aes_suspend(struct device *dev)
1265 {
1266         pm_runtime_put_sync(dev);
1267         return 0;
1268 }
1269
1270 static int omap_aes_resume(struct device *dev)
1271 {
1272         pm_runtime_get_sync(dev);
1273         return 0;
1274 }
1275 #endif
1276
1277 static SIMPLE_DEV_PM_OPS(omap_aes_pm_ops, omap_aes_suspend, omap_aes_resume);
1278
1279 static struct platform_driver omap_aes_driver = {
1280         .probe  = omap_aes_probe,
1281         .remove = omap_aes_remove,
1282         .driver = {
1283                 .name   = "omap-aes",
1284                 .pm     = &omap_aes_pm_ops,
1285                 .of_match_table = omap_aes_of_match,
1286         },
1287 };
1288
1289 module_platform_driver(omap_aes_driver);
1290
1291 MODULE_DESCRIPTION("OMAP AES hw acceleration support.");
1292 MODULE_LICENSE("GPL v2");
1293 MODULE_AUTHOR("Dmitry Kasatkin");
1294