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 <[email protected]>
   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/omap-dma.h>
  30 #include <linux/pm_runtime.h>
  31 #include <linux/of.h>
  32 #include <linux/of_device.h>
  33 #include <linux/of_address.h>
  34 #include <linux/io.h>
  35 #include <linux/crypto.h>
  36 #include <linux/interrupt.h>
  37 #include <crypto/scatterwalk.h>
  38 #include <crypto/aes.h>
  39 #include <crypto/algapi.h>
  40
  41 #define DST_MAXBURST                    4
  42 #define DMA_MIN                         (DST_MAXBURST * sizeof(u32))
  43
  44 #define _calc_walked(inout) (dd->inout##_walk.offset - dd->inout##_sg->offset)
  45
  46 /* OMAP TRM gives bitfields as start:end, where start is the higher bit
  47    number. For example 7:0 */
  48 #define FLD_MASK(start, end)    (((1 << ((start) - (end) + 1)) - 1) << (end))
  49 #define FLD_VAL(val, start, end) (((val) << (end)) & FLD_MASK(start, end))
  50
  51 #define AES_REG_KEY(dd, x)              ((dd)->pdata->key_ofs - \
  52                                                 ((x ^ 0x01) * 0x04))
  53 #define AES_REG_IV(dd, x)               ((dd)->pdata->iv_ofs + ((x) * 0x04))
  54
  55 #define AES_REG_CTRL(dd)                ((dd)->pdata->ctrl_ofs)
  56 #define AES_REG_CTRL_CTR_WIDTH_MASK     GENMASK(8, 7)
  57 #define AES_REG_CTRL_CTR_WIDTH_32       0
  58 #define AES_REG_CTRL_CTR_WIDTH_64       BIT(7)
  59 #define AES_REG_CTRL_CTR_WIDTH_96       BIT(8)
  60 #define AES_REG_CTRL_CTR_WIDTH_128      GENMASK(8, 7)
  61 #define AES_REG_CTRL_CTR                BIT(6)
  62 #define AES_REG_CTRL_CBC                BIT(5)
  63 #define AES_REG_CTRL_KEY_SIZE           GENMASK(4, 3)
  64 #define AES_REG_CTRL_DIRECTION          BIT(2)
  65 #define AES_REG_CTRL_INPUT_READY        BIT(1)
  66 #define AES_REG_CTRL_OUTPUT_READY       BIT(0)
  67 #define AES_REG_CTRL_MASK               GENMASK(24, 2)
  68
  69 #define AES_REG_DATA_N(dd, x)           ((dd)->pdata->data_ofs + ((x) * 0x04))
  70
  71 #define AES_REG_REV(dd)                 ((dd)->pdata->rev_ofs)
  72
  73 #define AES_REG_MASK(dd)                ((dd)->pdata->mask_ofs)
  74 #define AES_REG_MASK_SIDLE              BIT(6)
  75 #define AES_REG_MASK_START              BIT(5)
  76 #define AES_REG_MASK_DMA_OUT_EN         BIT(3)
  77 #define AES_REG_MASK_DMA_IN_EN          BIT(2)
  78 #define AES_REG_MASK_SOFTRESET          BIT(1)
  79 #define AES_REG_AUTOIDLE                BIT(0)
  80
  81 #define AES_REG_LENGTH_N(x)             (0x54 + ((x) * 0x04))
  82
  83 #define AES_REG_IRQ_STATUS(dd)         ((dd)->pdata->irq_status_ofs)
  84 #define AES_REG_IRQ_ENABLE(dd)         ((dd)->pdata->irq_enable_ofs)
  85 #define AES_REG_IRQ_DATA_IN            BIT(1)
  86 #define AES_REG_IRQ_DATA_OUT           BIT(2)
  87 #define DEFAULT_TIMEOUT         (5*HZ)
  88
  89 #define FLAGS_MODE_MASK         0x000f
  90 #define FLAGS_ENCRYPT           BIT(0)
  91 #define FLAGS_CBC               BIT(1)
  92 #define FLAGS_GIV               BIT(2)
  93 #define FLAGS_CTR               BIT(3)
  94
  95 #define FLAGS_INIT              BIT(4)
  96 #define FLAGS_FAST              BIT(5)
  97 #define FLAGS_BUSY              BIT(6)
  98
  99 #define AES_BLOCK_WORDS         (AES_BLOCK_SIZE >> 2)
 100
 101 struct omap_aes_ctx {
 102         struct omap_aes_dev *dd;
 103
 104         int             keylen;
 105         u32             key[AES_KEYSIZE_256 / sizeof(u32)];
 106         unsigned long   flags;
 107 };
 108
 109 struct omap_aes_reqctx {
 110         unsigned long mode;
 111 };
 112
 113 #define OMAP_AES_QUEUE_LENGTH   1
 114 #define OMAP_AES_CACHE_SIZE     0
 115
 116 struct omap_aes_algs_info {
 117         struct crypto_alg       *algs_list;
 118         unsigned int            size;
 119         unsigned int            registered;
 120 };
 121
 122 struct omap_aes_pdata {
 123         struct omap_aes_algs_info       *algs_info;
 124         unsigned int    algs_info_size;
 125
 126         void            (*trigger)(struct omap_aes_dev *dd, int length);
 127
 128         u32             key_ofs;
 129         u32             iv_ofs;
 130         u32             ctrl_ofs;
 131         u32             data_ofs;
 132         u32             rev_ofs;
 133         u32             mask_ofs;
 134         u32             irq_enable_ofs;
 135         u32             irq_status_ofs;
 136
 137         u32             dma_enable_in;
 138         u32             dma_enable_out;
 139         u32             dma_start;
 140
 141         u32             major_mask;
 142         u32             major_shift;
 143         u32             minor_mask;
 144         u32             minor_shift;
 145 };
 146
 147 struct omap_aes_dev {
 148         struct list_head        list;
 149         unsigned long           phys_base;
 150         void __iomem            *io_base;
 151         struct omap_aes_ctx     *ctx;
 152         struct device           *dev;
 153         unsigned long           flags;
 154         int                     err;
 155
 156         struct tasklet_struct   done_task;
 157
 158         struct ablkcipher_request       *req;
 159         struct crypto_engine            *engine;
 160
 161         /*
 162          * total is used by PIO mode for book keeping so introduce
 163          * variable total_save as need it to calc page_order
 164          */
 165         size_t                          total;
 166         size_t                          total_save;
 167
 168         struct scatterlist              *in_sg;
 169         struct scatterlist              *out_sg;
 170
 171         /* Buffers for copying for unaligned cases */
 172         struct scatterlist              in_sgl;
 173         struct scatterlist              out_sgl;
 174         struct scatterlist              *orig_out;
 175         int                             sgs_copied;
 176
 177         struct scatter_walk             in_walk;
 178         struct scatter_walk             out_walk;
 179         int                     dma_in;
 180         struct dma_chan         *dma_lch_in;
 181         int                     dma_out;
 182         struct dma_chan         *dma_lch_out;
 183         int                     in_sg_len;
 184         int                     out_sg_len;
 185         int                     pio_only;
 186         const struct omap_aes_pdata     *pdata;
 187 };
 188
 189 /* keep registered devices data here */
 190 static LIST_HEAD(dev_list);
 191 static DEFINE_SPINLOCK(list_lock);
 192
 193 #ifdef DEBUG
 194 #define omap_aes_read(dd, offset)                               \
 195 ({                                                              \
 196         int _read_ret;                                          \
 197         _read_ret = __raw_readl(dd->io_base + offset);          \
 198         pr_debug("omap_aes_read(" #offset "=%#x)= %#x\n",       \
 199                  offset, _read_ret);                            \
 200         _read_ret;                                              \
 201 })
 202 #else
 203 static inline u32 omap_aes_read(struct omap_aes_dev *dd, u32 offset)
 204 {
 205         return __raw_readl(dd->io_base + offset);
 206 }
 207 #endif
 208
 209 #ifdef DEBUG
 210 #define omap_aes_write(dd, offset, value)                               \
 211         do {                                                            \
 212                 pr_debug("omap_aes_write(" #offset "=%#x) value=%#x\n", \
 213                          offset, value);                                \
 214                 __raw_writel(value, dd->io_base + offset);              \
 215         } while (0)
 216 #else
 217 static inline void omap_aes_write(struct omap_aes_dev *dd, u32 offset,
 218                                   u32 value)
 219 {
 220         __raw_writel(value, dd->io_base + offset);
 221 }
 222 #endif
 223
 224 static inline void omap_aes_write_mask(struct omap_aes_dev *dd, u32 offset,
 225                                         u32 value, u32 mask)
 226 {
 227         u32 val;
 228
 229         val = omap_aes_read(dd, offset);
 230         val &= ~mask;
 231         val |= value;
 232         omap_aes_write(dd, offset, val);
 233 }
 234
 235 static void omap_aes_write_n(struct omap_aes_dev *dd, u32 offset,
 236                                         u32 *value, int count)
 237 {
 238         for (; count--; value++, offset += 4)
 239                 omap_aes_write(dd, offset, *value);
 240 }
 241
 242 static int omap_aes_hw_init(struct omap_aes_dev *dd)
 243 {
 244         if (!(dd->flags & FLAGS_INIT)) {
 245                 dd->flags |= FLAGS_INIT;
 246                 dd->err = 0;
 247         }
 248
 249         return 0;
 250 }
 251
 252 static int omap_aes_write_ctrl(struct omap_aes_dev *dd)
 253 {
 254         unsigned int key32;
 255         int i, err;
 256         u32 val;
 257
 258         err = omap_aes_hw_init(dd);
 259         if (err)
 260                 return err;
 261
 262         key32 = dd->ctx->keylen / sizeof(u32);
 263
 264         /* it seems a key should always be set even if it has not changed */
 265         for (i = 0; i < key32; i++) {
 266                 omap_aes_write(dd, AES_REG_KEY(dd, i),
 267                         __le32_to_cpu(dd->ctx->key[i]));
 268         }
 269
 270         if ((dd->flags & (FLAGS_CBC | FLAGS_CTR)) && dd->req->info)
 271                 omap_aes_write_n(dd, AES_REG_IV(dd, 0), dd->req->info, 4);
 272
 273         val = FLD_VAL(((dd->ctx->keylen >> 3) - 1), 4, 3);
 274         if (dd->flags & FLAGS_CBC)
 275                 val |= AES_REG_CTRL_CBC;
 276         if (dd->flags & FLAGS_CTR)
 277                 val |= AES_REG_CTRL_CTR | AES_REG_CTRL_CTR_WIDTH_128;
 278
 279         if (dd->flags & FLAGS_ENCRYPT)
 280                 val |= AES_REG_CTRL_DIRECTION;
 281
 282         omap_aes_write_mask(dd, AES_REG_CTRL(dd), val, AES_REG_CTRL_MASK);
 283
 284         return 0;
 285 }
 286
 287 static void omap_aes_dma_trigger_omap2(struct omap_aes_dev *dd, int length)
 288 {
 289         u32 mask, val;
 290
 291         val = dd->pdata->dma_start;
 292
 293         if (dd->dma_lch_out != NULL)
 294                 val |= dd->pdata->dma_enable_out;
 295         if (dd->dma_lch_in != NULL)
 296                 val |= dd->pdata->dma_enable_in;
 297
 298         mask = dd->pdata->dma_enable_out | dd->pdata->dma_enable_in |
 299                dd->pdata->dma_start;
 300
 301         omap_aes_write_mask(dd, AES_REG_MASK(dd), val, mask);
 302
 303 }
 304
 305 static void omap_aes_dma_trigger_omap4(struct omap_aes_dev *dd, int length)
 306 {
 307         omap_aes_write(dd, AES_REG_LENGTH_N(0), length);
 308         omap_aes_write(dd, AES_REG_LENGTH_N(1), 0);
 309
 310         omap_aes_dma_trigger_omap2(dd, length);
 311 }
 312
 313 static void omap_aes_dma_stop(struct omap_aes_dev *dd)
 314 {
 315         u32 mask;
 316
 317         mask = dd->pdata->dma_enable_out | dd->pdata->dma_enable_in |
 318                dd->pdata->dma_start;
 319
 320         omap_aes_write_mask(dd, AES_REG_MASK(dd), 0, mask);
 321 }
 322
 323 static struct omap_aes_dev *omap_aes_find_dev(struct omap_aes_ctx *ctx)
 324 {
 325         struct omap_aes_dev *dd = NULL, *tmp;
 326
 327         spin_lock_bh(&list_lock);
 328         if (!ctx->dd) {
 329                 list_for_each_entry(tmp, &dev_list, list) {
 330                         /* FIXME: take fist available aes core */
 331                         dd = tmp;
 332                         break;
 333                 }
 334                 ctx->dd = dd;
 335         } else {
 336                 /* already found before */
 337                 dd = ctx->dd;
 338         }
 339         spin_unlock_bh(&list_lock);
 340
 341         return dd;
 342 }
 343
 344 static void omap_aes_dma_out_callback(void *data)
 345 {
 346         struct omap_aes_dev *dd = data;
 347
 348         /* dma_lch_out - completed */
 349         tasklet_schedule(&dd->done_task);
 350 }
 351
 352 static int omap_aes_dma_init(struct omap_aes_dev *dd)
 353 {
 354         int err = -ENOMEM;
 355         dma_cap_mask_t mask;
 356
 357         dd->dma_lch_out = NULL;
 358         dd->dma_lch_in = NULL;
 359
 360         dma_cap_zero(mask);
 361         dma_cap_set(DMA_SLAVE, mask);
 362
 363         dd->dma_lch_in = dma_request_slave_channel_compat(mask,
 364                                                           omap_dma_filter_fn,
 365                                                           &dd->dma_in,
 366                                                           dd->dev, "rx");
 367         if (!dd->dma_lch_in) {
 368                 dev_err(dd->dev, "Unable to request in DMA channel\n");
 369                 goto err_dma_in;
 370         }
 371
 372         dd->dma_lch_out = dma_request_slave_channel_compat(mask,
 373                                                            omap_dma_filter_fn,
 374                                                            &dd->dma_out,
 375                                                            dd->dev, "tx");
 376         if (!dd->dma_lch_out) {
 377                 dev_err(dd->dev, "Unable to request out DMA channel\n");
 378                 goto err_dma_out;
 379         }
 380
 381         return 0;
 382
 383 err_dma_out:
 384         dma_release_channel(dd->dma_lch_in);
 385 err_dma_in:
 386         if (err)
 387                 pr_err("error: %d\n", err);
 388         return err;
 389 }
 390
 391 static void omap_aes_dma_cleanup(struct omap_aes_dev *dd)
 392 {
 393         dma_release_channel(dd->dma_lch_out);
 394         dma_release_channel(dd->dma_lch_in);
 395 }
 396
 397 static void sg_copy_buf(void *buf, struct scatterlist *sg,
 398                               unsigned int start, unsigned int nbytes, int out)
 399 {
 400         struct scatter_walk walk;
 401
 402         if (!nbytes)
 403                 return;
 404
 405         scatterwalk_start(&walk, sg);
 406         scatterwalk_advance(&walk, start);
 407         scatterwalk_copychunks(buf, &walk, nbytes, out);
 408         scatterwalk_done(&walk, out, 0);
 409 }
 410
 411 static int omap_aes_crypt_dma(struct crypto_tfm *tfm,
 412                 struct scatterlist *in_sg, struct scatterlist *out_sg,
 413                 int in_sg_len, int out_sg_len)
 414 {
 415         struct omap_aes_ctx *ctx = crypto_tfm_ctx(tfm);
 416         struct omap_aes_dev *dd = ctx->dd;
 417         struct dma_async_tx_descriptor *tx_in, *tx_out;
 418         struct dma_slave_config cfg;
 419         int ret;
 420
 421         if (dd->pio_only) {
 422                 scatterwalk_start(&dd->in_walk, dd->in_sg);
 423                 scatterwalk_start(&dd->out_walk, dd->out_sg);
 424
 425                 /* Enable DATAIN interrupt and let it take
 426                    care of the rest */
 427                 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x2);
 428                 return 0;
 429         }
 430
 431         dma_sync_sg_for_device(dd->dev, dd->in_sg, in_sg_len, DMA_TO_DEVICE);
 432
 433         memset(&cfg, 0, sizeof(cfg));
 434
 435         cfg.src_addr = dd->phys_base + AES_REG_DATA_N(dd, 0);
 436         cfg.dst_addr = dd->phys_base + AES_REG_DATA_N(dd, 0);
 437         cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 438         cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 439         cfg.src_maxburst = DST_MAXBURST;
 440         cfg.dst_maxburst = DST_MAXBURST;
 441
 442         /* IN */
 443         ret = dmaengine_slave_config(dd->dma_lch_in, &cfg);
 444         if (ret) {
 445                 dev_err(dd->dev, "can't configure IN dmaengine slave: %d\n",
 446                         ret);
 447                 return ret;
 448         }
 449
 450         tx_in = dmaengine_prep_slave_sg(dd->dma_lch_in, in_sg, in_sg_len,
 451                                         DMA_MEM_TO_DEV,
 452                                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 453         if (!tx_in) {
 454                 dev_err(dd->dev, "IN prep_slave_sg() failed\n");
 455                 return -EINVAL;
 456         }
 457
 458         /* No callback necessary */
 459         tx_in->callback_param = dd;
 460
 461         /* OUT */
 462         ret = dmaengine_slave_config(dd->dma_lch_out, &cfg);
 463         if (ret) {
 464                 dev_err(dd->dev, "can't configure OUT dmaengine slave: %d\n",
 465                         ret);
 466                 return ret;
 467         }
 468
 469         tx_out = dmaengine_prep_slave_sg(dd->dma_lch_out, out_sg, out_sg_len,
 470                                         DMA_DEV_TO_MEM,
 471                                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 472         if (!tx_out) {
 473                 dev_err(dd->dev, "OUT prep_slave_sg() failed\n");
 474                 return -EINVAL;
 475         }
 476
 477         tx_out->callback = omap_aes_dma_out_callback;
 478         tx_out->callback_param = dd;
 479
 480         dmaengine_submit(tx_in);
 481         dmaengine_submit(tx_out);
 482
 483         dma_async_issue_pending(dd->dma_lch_in);
 484         dma_async_issue_pending(dd->dma_lch_out);
 485
 486         /* start DMA */
 487         dd->pdata->trigger(dd, dd->total);
 488
 489         return 0;
 490 }
 491
 492 static int omap_aes_crypt_dma_start(struct omap_aes_dev *dd)
 493 {
 494         struct crypto_tfm *tfm = crypto_ablkcipher_tfm(
 495                                         crypto_ablkcipher_reqtfm(dd->req));
 496         int err;
 497
 498         pr_debug("total: %d\n", dd->total);
 499
 500         if (!dd->pio_only) {
 501                 err = dma_map_sg(dd->dev, dd->in_sg, dd->in_sg_len,
 502                                  DMA_TO_DEVICE);
 503                 if (!err) {
 504                         dev_err(dd->dev, "dma_map_sg() error\n");
 505                         return -EINVAL;
 506                 }
 507
 508                 err = dma_map_sg(dd->dev, dd->out_sg, dd->out_sg_len,
 509                                  DMA_FROM_DEVICE);
 510                 if (!err) {
 511                         dev_err(dd->dev, "dma_map_sg() error\n");
 512                         return -EINVAL;
 513                 }
 514         }
 515
 516         err = omap_aes_crypt_dma(tfm, dd->in_sg, dd->out_sg, dd->in_sg_len,
 517                                  dd->out_sg_len);
 518         if (err && !dd->pio_only) {
 519                 dma_unmap_sg(dd->dev, dd->in_sg, dd->in_sg_len, DMA_TO_DEVICE);
 520                 dma_unmap_sg(dd->dev, dd->out_sg, dd->out_sg_len,
 521                              DMA_FROM_DEVICE);
 522         }
 523
 524         return err;
 525 }
 526
 527 static void omap_aes_finish_req(struct omap_aes_dev *dd, int err)
 528 {
 529         struct ablkcipher_request *req = dd->req;
 530
 531         pr_debug("err: %d\n", err);
 532
 533         crypto_finalize_request(dd->engine, req, err);
 534 }
 535
 536 static int omap_aes_crypt_dma_stop(struct omap_aes_dev *dd)
 537 {
 538         pr_debug("total: %d\n", dd->total);
 539
 540         omap_aes_dma_stop(dd);
 541
 542         dmaengine_terminate_all(dd->dma_lch_in);
 543         dmaengine_terminate_all(dd->dma_lch_out);
 544
 545         return 0;
 546 }
 547
 548 static int omap_aes_check_aligned(struct scatterlist *sg, int total)
 549 {
 550         int len = 0;
 551
 552         if (!IS_ALIGNED(total, AES_BLOCK_SIZE))
 553                 return -EINVAL;
 554
 555         while (sg) {
 556                 if (!IS_ALIGNED(sg->offset, 4))
 557                         return -1;
 558                 if (!IS_ALIGNED(sg->length, AES_BLOCK_SIZE))
 559                         return -1;
 560
 561                 len += sg->length;
 562                 sg = sg_next(sg);
 563         }
 564
 565         if (len != total)
 566                 return -1;
 567
 568         return 0;
 569 }
 570
 571 static int omap_aes_copy_sgs(struct omap_aes_dev *dd)
 572 {
 573         void *buf_in, *buf_out;
 574         int pages, total;
 575
 576         total = ALIGN(dd->total, AES_BLOCK_SIZE);
 577         pages = get_order(total);
 578
 579         buf_in = (void *)__get_free_pages(GFP_ATOMIC, pages);
 580         buf_out = (void *)__get_free_pages(GFP_ATOMIC, pages);
 581
 582         if (!buf_in || !buf_out) {
 583                 pr_err("Couldn't allocated pages for unaligned cases.\n");
 584                 return -1;
 585         }
 586
 587         dd->orig_out = dd->out_sg;
 588
 589         sg_copy_buf(buf_in, dd->in_sg, 0, dd->total, 0);
 590
 591         sg_init_table(&dd->in_sgl, 1);
 592         sg_set_buf(&dd->in_sgl, buf_in, total);
 593         dd->in_sg = &dd->in_sgl;
 594
 595         sg_init_table(&dd->out_sgl, 1);
 596         sg_set_buf(&dd->out_sgl, buf_out, total);
 597         dd->out_sg = &dd->out_sgl;
 598
 599         return 0;
 600 }
 601
 602 static int omap_aes_handle_queue(struct omap_aes_dev *dd,
 603                                  struct ablkcipher_request *req)
 604 {
 605         if (req)
 606                 return crypto_transfer_request_to_engine(dd->engine, req);
 607
 608         return 0;
 609 }
 610
 611 static int omap_aes_prepare_req(struct crypto_engine *engine,
 612                                 struct ablkcipher_request *req)
 613 {
 614         struct omap_aes_ctx *ctx = crypto_ablkcipher_ctx(
 615                         crypto_ablkcipher_reqtfm(req));
 616         struct omap_aes_dev *dd = omap_aes_find_dev(ctx);
 617         struct omap_aes_reqctx *rctx;
 618         int len;
 619
 620         if (!dd)
 621                 return -ENODEV;
 622
 623         /* assign new request to device */
 624         dd->req = req;
 625         dd->total = req->nbytes;
 626         dd->total_save = req->nbytes;
 627         dd->in_sg = req->src;
 628         dd->out_sg = req->dst;
 629
 630         if (omap_aes_check_aligned(dd->in_sg, dd->total) ||
 631             omap_aes_check_aligned(dd->out_sg, dd->total)) {
 632                 if (omap_aes_copy_sgs(dd))
 633                         pr_err("Failed to copy SGs for unaligned cases\n");
 634                 dd->sgs_copied = 1;
 635         } else {
 636                 dd->sgs_copied = 0;
 637         }
 638
 639         len = ALIGN(dd->total, AES_BLOCK_SIZE);
 640         dd->in_sg_len = scatterwalk_bytes_sglen(dd->in_sg, len);
 641         dd->out_sg_len = scatterwalk_bytes_sglen(dd->out_sg, len);
 642         BUG_ON(dd->in_sg_len < 0 || dd->out_sg_len < 0);
 643
 644         rctx = ablkcipher_request_ctx(req);
 645         ctx = crypto_ablkcipher_ctx(crypto_ablkcipher_reqtfm(req));
 646         rctx->mode &= FLAGS_MODE_MASK;
 647         dd->flags = (dd->flags & ~FLAGS_MODE_MASK) | rctx->mode;
 648
 649         dd->ctx = ctx;
 650         ctx->dd = dd;
 651
 652         return omap_aes_write_ctrl(dd);
 653 }
 654
 655 static int omap_aes_crypt_req(struct crypto_engine *engine,
 656                               struct ablkcipher_request *req)
 657 {
 658         struct omap_aes_ctx *ctx = crypto_ablkcipher_ctx(
 659                         crypto_ablkcipher_reqtfm(req));
 660         struct omap_aes_dev *dd = omap_aes_find_dev(ctx);
 661
 662         if (!dd)
 663                 return -ENODEV;
 664
 665         return omap_aes_crypt_dma_start(dd);
 666 }
 667
 668 static void omap_aes_done_task(unsigned long data)
 669 {
 670         struct omap_aes_dev *dd = (struct omap_aes_dev *)data;
 671         void *buf_in, *buf_out;
 672         int pages, len;
 673
 674         pr_debug("enter done_task\n");
 675
 676         if (!dd->pio_only) {
 677                 dma_sync_sg_for_device(dd->dev, dd->out_sg, dd->out_sg_len,
 678                                        DMA_FROM_DEVICE);
 679                 dma_unmap_sg(dd->dev, dd->in_sg, dd->in_sg_len, DMA_TO_DEVICE);
 680                 dma_unmap_sg(dd->dev, dd->out_sg, dd->out_sg_len,
 681                              DMA_FROM_DEVICE);
 682                 omap_aes_crypt_dma_stop(dd);
 683         }
 684
 685         if (dd->sgs_copied) {
 686                 buf_in = sg_virt(&dd->in_sgl);
 687                 buf_out = sg_virt(&dd->out_sgl);
 688
 689                 sg_copy_buf(buf_out, dd->orig_out, 0, dd->total_save, 1);
 690
 691                 len = ALIGN(dd->total_save, AES_BLOCK_SIZE);
 692                 pages = get_order(len);
 693                 free_pages((unsigned long)buf_in, pages);
 694                 free_pages((unsigned long)buf_out, pages);
 695         }
 696
 697         omap_aes_finish_req(dd, 0);
 698
 699         pr_debug("exit\n");
 700 }
 701
 702 static int omap_aes_crypt(struct ablkcipher_request *req, unsigned long mode)
 703 {
 704         struct omap_aes_ctx *ctx = crypto_ablkcipher_ctx(
 705                         crypto_ablkcipher_reqtfm(req));
 706         struct omap_aes_reqctx *rctx = ablkcipher_request_ctx(req);
 707         struct omap_aes_dev *dd;
 708
 709         pr_debug("nbytes: %d, enc: %d, cbc: %d\n", req->nbytes,
 710                   !!(mode & FLAGS_ENCRYPT),
 711                   !!(mode & FLAGS_CBC));
 712
 713         dd = omap_aes_find_dev(ctx);
 714         if (!dd)
 715                 return -ENODEV;
 716
 717         rctx->mode = mode;
 718
 719         return omap_aes_handle_queue(dd, req);
 720 }
 721
 722 /* ********************** ALG API ************************************ */
 723
 724 static int omap_aes_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
 725                            unsigned int keylen)
 726 {
 727         struct omap_aes_ctx *ctx = crypto_ablkcipher_ctx(tfm);
 728
 729         if (keylen != AES_KEYSIZE_128 && keylen != AES_KEYSIZE_192 &&
 730                    keylen != AES_KEYSIZE_256)
 731                 return -EINVAL;
 732
 733         pr_debug("enter, keylen: %d\n", keylen);
 734
 735         memcpy(ctx->key, key, keylen);
 736         ctx->keylen = keylen;
 737
 738         return 0;
 739 }
 740
 741 static int omap_aes_ecb_encrypt(struct ablkcipher_request *req)
 742 {
 743         return omap_aes_crypt(req, FLAGS_ENCRYPT);
 744 }
 745
 746 static int omap_aes_ecb_decrypt(struct ablkcipher_request *req)
 747 {
 748         return omap_aes_crypt(req, 0);
 749 }
 750
 751 static int omap_aes_cbc_encrypt(struct ablkcipher_request *req)
 752 {
 753         return omap_aes_crypt(req, FLAGS_ENCRYPT | FLAGS_CBC);
 754 }
 755
 756 static int omap_aes_cbc_decrypt(struct ablkcipher_request *req)
 757 {
 758         return omap_aes_crypt(req, FLAGS_CBC);
 759 }
 760
 761 static int omap_aes_ctr_encrypt(struct ablkcipher_request *req)
 762 {
 763         return omap_aes_crypt(req, FLAGS_ENCRYPT | FLAGS_CTR);
 764 }
 765
 766 static int omap_aes_ctr_decrypt(struct ablkcipher_request *req)
 767 {
 768         return omap_aes_crypt(req, FLAGS_CTR);
 769 }
 770
 771 static int omap_aes_cra_init(struct crypto_tfm *tfm)
 772 {
 773         struct omap_aes_dev *dd = NULL;
 774         int err;
 775
 776         /* Find AES device, currently picks the first device */
 777         spin_lock_bh(&list_lock);
 778         list_for_each_entry(dd, &dev_list, list) {
 779                 break;
 780         }
 781         spin_unlock_bh(&list_lock);
 782
 783         err = pm_runtime_get_sync(dd->dev);
 784         if (err < 0) {
 785                 dev_err(dd->dev, "%s: failed to get_sync(%d)\n",
 786                         __func__, err);
 787                 return err;
 788         }
 789
 790         tfm->crt_ablkcipher.reqsize = sizeof(struct omap_aes_reqctx);
 791
 792         return 0;
 793 }
 794
 795 static void omap_aes_cra_exit(struct crypto_tfm *tfm)
 796 {
 797         struct omap_aes_dev *dd = NULL;
 798
 799         /* Find AES device, currently picks the first device */
 800         spin_lock_bh(&list_lock);
 801         list_for_each_entry(dd, &dev_list, list) {
 802                 break;
 803         }
 804         spin_unlock_bh(&list_lock);
 805
 806         pm_runtime_put_sync(dd->dev);
 807 }
 808
 809 /* ********************** ALGS ************************************ */
 810
 811 static struct crypto_alg algs_ecb_cbc[] = {
 812 {
 813         .cra_name               = "ecb(aes)",
 814         .cra_driver_name        = "ecb-aes-omap",
 815         .cra_priority           = 300,
 816         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER |
 817                                   CRYPTO_ALG_KERN_DRIVER_ONLY |
 818                                   CRYPTO_ALG_ASYNC,
 819         .cra_blocksize          = AES_BLOCK_SIZE,
 820         .cra_ctxsize            = sizeof(struct omap_aes_ctx),
 821         .cra_alignmask          = 0,
 822         .cra_type               = &crypto_ablkcipher_type,
 823         .cra_module             = THIS_MODULE,
 824         .cra_init               = omap_aes_cra_init,
 825         .cra_exit               = omap_aes_cra_exit,
 826         .cra_u.ablkcipher = {
 827                 .min_keysize    = AES_MIN_KEY_SIZE,
 828                 .max_keysize    = AES_MAX_KEY_SIZE,
 829                 .setkey         = omap_aes_setkey,
 830                 .encrypt        = omap_aes_ecb_encrypt,
 831                 .decrypt        = omap_aes_ecb_decrypt,
 832         }
 833 },
 834 {
 835         .cra_name               = "cbc(aes)",
 836         .cra_driver_name        = "cbc-aes-omap",
 837         .cra_priority           = 300,
 838         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER |
 839                                   CRYPTO_ALG_KERN_DRIVER_ONLY |
 840                                   CRYPTO_ALG_ASYNC,
 841         .cra_blocksize          = AES_BLOCK_SIZE,
 842         .cra_ctxsize            = sizeof(struct omap_aes_ctx),
 843         .cra_alignmask          = 0,
 844         .cra_type               = &crypto_ablkcipher_type,
 845         .cra_module             = THIS_MODULE,
 846         .cra_init               = omap_aes_cra_init,
 847         .cra_exit               = omap_aes_cra_exit,
 848         .cra_u.ablkcipher = {
 849                 .min_keysize    = AES_MIN_KEY_SIZE,
 850                 .max_keysize    = AES_MAX_KEY_SIZE,
 851                 .ivsize         = AES_BLOCK_SIZE,
 852                 .setkey         = omap_aes_setkey,
 853                 .encrypt        = omap_aes_cbc_encrypt,
 854                 .decrypt        = omap_aes_cbc_decrypt,
 855         }
 856 }
 857 };
 858
 859 static struct crypto_alg algs_ctr[] = {
 860 {
 861         .cra_name               = "ctr(aes)",
 862         .cra_driver_name        = "ctr-aes-omap",
 863         .cra_priority           = 300,
 864         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER |
 865                                   CRYPTO_ALG_KERN_DRIVER_ONLY |
 866                                   CRYPTO_ALG_ASYNC,
 867         .cra_blocksize          = AES_BLOCK_SIZE,
 868         .cra_ctxsize            = sizeof(struct omap_aes_ctx),
 869         .cra_alignmask          = 0,
 870         .cra_type               = &crypto_ablkcipher_type,
 871         .cra_module             = THIS_MODULE,
 872         .cra_init               = omap_aes_cra_init,
 873         .cra_exit               = omap_aes_cra_exit,
 874         .cra_u.ablkcipher = {
 875                 .min_keysize    = AES_MIN_KEY_SIZE,
 876                 .max_keysize    = AES_MAX_KEY_SIZE,
 877                 .geniv          = "eseqiv",
 878                 .ivsize         = AES_BLOCK_SIZE,
 879                 .setkey         = omap_aes_setkey,
 880                 .encrypt        = omap_aes_ctr_encrypt,
 881                 .decrypt        = omap_aes_ctr_decrypt,
 882         }
 883 } ,
 884 };
 885
 886 static struct omap_aes_algs_info omap_aes_algs_info_ecb_cbc[] = {
 887         {
 888                 .algs_list      = algs_ecb_cbc,
 889                 .size           = ARRAY_SIZE(algs_ecb_cbc),
 890         },
 891 };
 892
 893 static const struct omap_aes_pdata omap_aes_pdata_omap2 = {
 894         .algs_info      = omap_aes_algs_info_ecb_cbc,
 895         .algs_info_size = ARRAY_SIZE(omap_aes_algs_info_ecb_cbc),
 896         .trigger        = omap_aes_dma_trigger_omap2,
 897         .key_ofs        = 0x1c,
 898         .iv_ofs         = 0x20,
 899         .ctrl_ofs       = 0x30,
 900         .data_ofs       = 0x34,
 901         .rev_ofs        = 0x44,
 902         .mask_ofs       = 0x48,
 903         .dma_enable_in  = BIT(2),
 904         .dma_enable_out = BIT(3),
 905         .dma_start      = BIT(5),
 906         .major_mask     = 0xf0,
 907         .major_shift    = 4,
 908         .minor_mask     = 0x0f,
 909         .minor_shift    = 0,
 910 };
 911
 912 #ifdef CONFIG_OF
 913 static struct omap_aes_algs_info omap_aes_algs_info_ecb_cbc_ctr[] = {
 914         {
 915                 .algs_list      = algs_ecb_cbc,
 916                 .size           = ARRAY_SIZE(algs_ecb_cbc),
 917         },
 918         {
 919                 .algs_list      = algs_ctr,
 920                 .size           = ARRAY_SIZE(algs_ctr),
 921         },
 922 };
 923
 924 static const struct omap_aes_pdata omap_aes_pdata_omap3 = {
 925         .algs_info      = omap_aes_algs_info_ecb_cbc_ctr,
 926         .algs_info_size = ARRAY_SIZE(omap_aes_algs_info_ecb_cbc_ctr),
 927         .trigger        = omap_aes_dma_trigger_omap2,
 928         .key_ofs        = 0x1c,
 929         .iv_ofs         = 0x20,
 930         .ctrl_ofs       = 0x30,
 931         .data_ofs       = 0x34,
 932         .rev_ofs        = 0x44,
 933         .mask_ofs       = 0x48,
 934         .dma_enable_in  = BIT(2),
 935         .dma_enable_out = BIT(3),
 936         .dma_start      = BIT(5),
 937         .major_mask     = 0xf0,
 938         .major_shift    = 4,
 939         .minor_mask     = 0x0f,
 940         .minor_shift    = 0,
 941 };
 942
 943 static const struct omap_aes_pdata omap_aes_pdata_omap4 = {
 944         .algs_info      = omap_aes_algs_info_ecb_cbc_ctr,
 945         .algs_info_size = ARRAY_SIZE(omap_aes_algs_info_ecb_cbc_ctr),
 946         .trigger        = omap_aes_dma_trigger_omap4,
 947         .key_ofs        = 0x3c,
 948         .iv_ofs         = 0x40,
 949         .ctrl_ofs       = 0x50,
 950         .data_ofs       = 0x60,
 951         .rev_ofs        = 0x80,
 952         .mask_ofs       = 0x84,
 953         .irq_status_ofs = 0x8c,
 954         .irq_enable_ofs = 0x90,
 955         .dma_enable_in  = BIT(5),
 956         .dma_enable_out = BIT(6),
 957         .major_mask     = 0x0700,
 958         .major_shift    = 8,
 959         .minor_mask     = 0x003f,
 960         .minor_shift    = 0,
 961 };
 962
 963 static irqreturn_t omap_aes_irq(int irq, void *dev_id)
 964 {
 965         struct omap_aes_dev *dd = dev_id;
 966         u32 status, i;
 967         u32 *src, *dst;
 968
 969         status = omap_aes_read(dd, AES_REG_IRQ_STATUS(dd));
 970         if (status & AES_REG_IRQ_DATA_IN) {
 971                 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x0);
 972
 973                 BUG_ON(!dd->in_sg);
 974
 975                 BUG_ON(_calc_walked(in) > dd->in_sg->length);
 976
 977                 src = sg_virt(dd->in_sg) + _calc_walked(in);
 978
 979                 for (i = 0; i < AES_BLOCK_WORDS; i++) {
 980                         omap_aes_write(dd, AES_REG_DATA_N(dd, i), *src);
 981
 982                         scatterwalk_advance(&dd->in_walk, 4);
 983                         if (dd->in_sg->length == _calc_walked(in)) {
 984                                 dd->in_sg = sg_next(dd->in_sg);
 985                                 if (dd->in_sg) {
 986                                         scatterwalk_start(&dd->in_walk,
 987                                                           dd->in_sg);
 988                                         src = sg_virt(dd->in_sg) +
 989                                               _calc_walked(in);
 990                                 }
 991                         } else {
 992                                 src++;
 993                         }
 994                 }
 995
 996                 /* Clear IRQ status */
 997                 status &= ~AES_REG_IRQ_DATA_IN;
 998                 omap_aes_write(dd, AES_REG_IRQ_STATUS(dd), status);
 999
1000                 /* Enable DATA_OUT interrupt */
1001                 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x4);
1002
1003         } else if (status & AES_REG_IRQ_DATA_OUT) {
1004                 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x0);
1005
1006                 BUG_ON(!dd->out_sg);
1007
1008                 BUG_ON(_calc_walked(out) > dd->out_sg->length);
1009
1010                 dst = sg_virt(dd->out_sg) + _calc_walked(out);
1011
1012                 for (i = 0; i < AES_BLOCK_WORDS; i++) {
1013                         *dst = omap_aes_read(dd, AES_REG_DATA_N(dd, i));
1014                         scatterwalk_advance(&dd->out_walk, 4);
1015                         if (dd->out_sg->length == _calc_walked(out)) {
1016                                 dd->out_sg = sg_next(dd->out_sg);
1017                                 if (dd->out_sg) {
1018                                         scatterwalk_start(&dd->out_walk,
1019                                                           dd->out_sg);
1020                                         dst = sg_virt(dd->out_sg) +
1021                                               _calc_walked(out);
1022                                 }
1023                         } else {
1024                                 dst++;
1025                         }
1026                 }
1027
1028                 dd->total -= min_t(size_t, AES_BLOCK_SIZE, dd->total);
1029
1030                 /* Clear IRQ status */
1031                 status &= ~AES_REG_IRQ_DATA_OUT;
1032                 omap_aes_write(dd, AES_REG_IRQ_STATUS(dd), status);
1033
1034                 if (!dd->total)
1035                         /* All bytes read! */
1036                         tasklet_schedule(&dd->done_task);
1037                 else
1038                         /* Enable DATA_IN interrupt for next block */
1039                         omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x2);
1040         }
1041
1042         return IRQ_HANDLED;
1043 }
1044
1045 static const struct of_device_id omap_aes_of_match[] = {
1046         {
1047                 .compatible     = "ti,omap2-aes",
1048                 .data           = &omap_aes_pdata_omap2,
1049         },
1050         {
1051                 .compatible     = "ti,omap3-aes",
1052                 .data           = &omap_aes_pdata_omap3,
1053         },
1054         {
1055                 .compatible     = "ti,omap4-aes",
1056                 .data           = &omap_aes_pdata_omap4,
1057         },
1058         {},
1059 };
1060 MODULE_DEVICE_TABLE(of, omap_aes_of_match);
1061
1062 static int omap_aes_get_res_of(struct omap_aes_dev *dd,
1063                 struct device *dev, struct resource *res)
1064 {
1065         struct device_node *node = dev->of_node;
1066         const struct of_device_id *match;
1067         int err = 0;
1068
1069         match = of_match_device(of_match_ptr(omap_aes_of_match), dev);
1070         if (!match) {
1071                 dev_err(dev, "no compatible OF match\n");
1072                 err = -EINVAL;
1073                 goto err;
1074         }
1075
1076         err = of_address_to_resource(node, 0, res);
1077         if (err < 0) {
1078                 dev_err(dev, "can't translate OF node address\n");
1079                 err = -EINVAL;
1080                 goto err;
1081         }
1082
1083         dd->dma_out = -1; /* Dummy value that's unused */
1084         dd->dma_in = -1; /* Dummy value that's unused */
1085
1086         dd->pdata = match->data;
1087
1088 err:
1089         return err;
1090 }
1091 #else
1092 static const struct of_device_id omap_aes_of_match[] = {
1093         {},
1094 };
1095
1096 static int omap_aes_get_res_of(struct omap_aes_dev *dd,
1097                 struct device *dev, struct resource *res)
1098 {
1099         return -EINVAL;
1100 }
1101 #endif
1102
1103 static int omap_aes_get_res_pdev(struct omap_aes_dev *dd,
1104                 struct platform_device *pdev, struct resource *res)
1105 {
1106         struct device *dev = &pdev->dev;
1107         struct resource *r;
1108         int err = 0;
1109
1110         /* Get the base address */
1111         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1112         if (!r) {
1113                 dev_err(dev, "no MEM resource info\n");
1114                 err = -ENODEV;
1115                 goto err;
1116         }
1117         memcpy(res, r, sizeof(*res));
1118
1119         /* Get the DMA out channel */
1120         r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
1121         if (!r) {
1122                 dev_err(dev, "no DMA out resource info\n");
1123                 err = -ENODEV;
1124                 goto err;
1125         }
1126         dd->dma_out = r->start;
1127
1128         /* Get the DMA in channel */
1129         r = platform_get_resource(pdev, IORESOURCE_DMA, 1);
1130         if (!r) {
1131                 dev_err(dev, "no DMA in resource info\n");
1132                 err = -ENODEV;
1133                 goto err;
1134         }
1135         dd->dma_in = r->start;
1136
1137         /* Only OMAP2/3 can be non-DT */
1138         dd->pdata = &omap_aes_pdata_omap2;
1139
1140 err:
1141         return err;
1142 }
1143
1144 static int omap_aes_probe(struct platform_device *pdev)
1145 {
1146         struct device *dev = &pdev->dev;
1147         struct omap_aes_dev *dd;
1148         struct crypto_alg *algp;
1149         struct resource res;
1150         int err = -ENOMEM, i, j, irq = -1;
1151         u32 reg;
1152
1153         dd = devm_kzalloc(dev, sizeof(struct omap_aes_dev), GFP_KERNEL);
1154         if (dd == NULL) {
1155                 dev_err(dev, "unable to alloc data struct.\n");
1156                 goto err_data;
1157         }
1158         dd->dev = dev;
1159         platform_set_drvdata(pdev, dd);
1160
1161         err = (dev->of_node) ? omap_aes_get_res_of(dd, dev, &res) :
1162                                omap_aes_get_res_pdev(dd, pdev, &res);
1163         if (err)
1164                 goto err_res;
1165
1166         dd->io_base = devm_ioremap_resource(dev, &res);
1167         if (IS_ERR(dd->io_base)) {
1168                 err = PTR_ERR(dd->io_base);
1169                 goto err_res;
1170         }
1171         dd->phys_base = res.start;
1172
1173         pm_runtime_enable(dev);
1174         err = pm_runtime_get_sync(dev);
1175         if (err < 0) {
1176                 dev_err(dev, "%s: failed to get_sync(%d)\n",
1177                         __func__, err);
1178                 goto err_res;
1179         }
1180
1181         omap_aes_dma_stop(dd);
1182
1183         reg = omap_aes_read(dd, AES_REG_REV(dd));
1184
1185         pm_runtime_put_sync(dev);
1186
1187         dev_info(dev, "OMAP AES hw accel rev: %u.%u\n",
1188                  (reg & dd->pdata->major_mask) >> dd->pdata->major_shift,
1189                  (reg & dd->pdata->minor_mask) >> dd->pdata->minor_shift);
1190
1191         tasklet_init(&dd->done_task, omap_aes_done_task, (unsigned long)dd);
1192
1193         err = omap_aes_dma_init(dd);
1194         if (err && AES_REG_IRQ_STATUS(dd) && AES_REG_IRQ_ENABLE(dd)) {
1195                 dd->pio_only = 1;
1196
1197                 irq = platform_get_irq(pdev, 0);
1198                 if (irq < 0) {
1199                         dev_err(dev, "can't get IRQ resource\n");
1200                         goto err_irq;
1201                 }
1202
1203                 err = devm_request_irq(dev, irq, omap_aes_irq, 0,
1204                                 dev_name(dev), dd);
1205                 if (err) {
1206                         dev_err(dev, "Unable to grab omap-aes IRQ\n");
1207                         goto err_irq;
1208                 }
1209         }
1210
1211
1212         INIT_LIST_HEAD(&dd->list);
1213         spin_lock(&list_lock);
1214         list_add_tail(&dd->list, &dev_list);
1215         spin_unlock(&list_lock);
1216
1217         for (i = 0; i < dd->pdata->algs_info_size; i++) {
1218                 for (j = 0; j < dd->pdata->algs_info[i].size; j++) {
1219                         algp = &dd->pdata->algs_info[i].algs_list[j];
1220
1221                         pr_debug("reg alg: %s\n", algp->cra_name);
1222                         INIT_LIST_HEAD(&algp->cra_list);
1223
1224                         err = crypto_register_alg(algp);
1225                         if (err)
1226                                 goto err_algs;
1227
1228                         dd->pdata->algs_info[i].registered++;
1229                 }
1230         }
1231
1232         /* Initialize crypto engine */
1233         dd->engine = crypto_engine_alloc_init(dev, 1);
1234         if (!dd->engine)
1235                 goto err_algs;
1236
1237         dd->engine->prepare_request = omap_aes_prepare_req;
1238         dd->engine->crypt_one_request = omap_aes_crypt_req;
1239         err = crypto_engine_start(dd->engine);
1240         if (err)
1241                 goto err_engine;
1242
1243         return 0;
1244 err_engine:
1245         crypto_engine_exit(dd->engine);
1246 err_algs:
1247         for (i = dd->pdata->algs_info_size - 1; i >= 0; i--)
1248                 for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--)
1249                         crypto_unregister_alg(
1250                                         &dd->pdata->algs_info[i].algs_list[j]);
1251         if (!dd->pio_only)
1252                 omap_aes_dma_cleanup(dd);
1253 err_irq:
1254         tasklet_kill(&dd->done_task);
1255         pm_runtime_disable(dev);
1256 err_res:
1257         dd = NULL;
1258 err_data:
1259         dev_err(dev, "initialization failed.\n");
1260         return err;
1261 }
1262
1263 static int omap_aes_remove(struct platform_device *pdev)
1264 {
1265         struct omap_aes_dev *dd = platform_get_drvdata(pdev);
1266         int i, j;
1267
1268         if (!dd)
1269                 return -ENODEV;
1270
1271         spin_lock(&list_lock);
1272         list_del(&dd->list);
1273         spin_unlock(&list_lock);
1274
1275         for (i = dd->pdata->algs_info_size - 1; i >= 0; i--)
1276                 for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--)
1277                         crypto_unregister_alg(
1278                                         &dd->pdata->algs_info[i].algs_list[j]);
1279
1280         crypto_engine_exit(dd->engine);
1281         tasklet_kill(&dd->done_task);
1282         omap_aes_dma_cleanup(dd);
1283         pm_runtime_disable(dd->dev);
1284         dd = NULL;
1285
1286         return 0;
1287 }
1288
1289 #ifdef CONFIG_PM_SLEEP
1290 static int omap_aes_suspend(struct device *dev)
1291 {
1292         pm_runtime_put_sync(dev);
1293         return 0;
1294 }
1295
1296 static int omap_aes_resume(struct device *dev)
1297 {
1298         pm_runtime_get_sync(dev);
1299         return 0;
1300 }
1301 #endif
1302
1303 static SIMPLE_DEV_PM_OPS(omap_aes_pm_ops, omap_aes_suspend, omap_aes_resume);
1304
1305 static struct platform_driver omap_aes_driver = {
1306         .probe  = omap_aes_probe,
1307         .remove = omap_aes_remove,
1308         .driver = {
1309                 .name   = "omap-aes",
1310                 .pm     = &omap_aes_pm_ops,
1311                 .of_match_table = omap_aes_of_match,
1312         },
1313 };
1314
1315 module_platform_driver(omap_aes_driver);
1316
1317 MODULE_DESCRIPTION("OMAP AES hw acceleration support.");
1318 MODULE_LICENSE("GPL v2");
1319 MODULE_AUTHOR("Dmitry Kasatkin");
1320