drivers/crypto/s5p-sss.c

   1 /*
   2  * Cryptographic API.
   3  *
   4  * Support for Samsung S5PV210 HW acceleration.
   5  *
   6  * Copyright (C) 2011 NetUP Inc. All rights reserved.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as published
  10  * by the Free Software Foundation.
  11  *
  12  */
  13
  14 #include <linux/delay.h>
  15 #include <linux/err.h>
  16 #include <linux/module.h>
  17 #include <linux/init.h>
  18 #include <linux/errno.h>
  19 #include <linux/kernel.h>
  20 #include <linux/clk.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/scatterlist.h>
  23 #include <linux/dma-mapping.h>
  24 #include <linux/io.h>
  25 #include <linux/crypto.h>
  26 #include <linux/interrupt.h>
  27
  28 #include <crypto/algapi.h>
  29 #include <crypto/aes.h>
  30 #include <crypto/ctr.h>
  31
  32 #include <plat/cpu.h>
  33 #include <plat/dma.h>
  34
  35 #define _SBF(s, v)                      ((v) << (s))
  36 #define _BIT(b)                         _SBF(b, 1)
  37
  38 /* Feed control registers */
  39 #define SSS_REG_FCINTSTAT               0x0000
  40 #define SSS_FCINTSTAT_BRDMAINT          _BIT(3)
  41 #define SSS_FCINTSTAT_BTDMAINT          _BIT(2)
  42 #define SSS_FCINTSTAT_HRDMAINT          _BIT(1)
  43 #define SSS_FCINTSTAT_PKDMAINT          _BIT(0)
  44
  45 #define SSS_REG_FCINTENSET              0x0004
  46 #define SSS_FCINTENSET_BRDMAINTENSET    _BIT(3)
  47 #define SSS_FCINTENSET_BTDMAINTENSET    _BIT(2)
  48 #define SSS_FCINTENSET_HRDMAINTENSET    _BIT(1)
  49 #define SSS_FCINTENSET_PKDMAINTENSET    _BIT(0)
  50
  51 #define SSS_REG_FCINTENCLR              0x0008
  52 #define SSS_FCINTENCLR_BRDMAINTENCLR    _BIT(3)
  53 #define SSS_FCINTENCLR_BTDMAINTENCLR    _BIT(2)
  54 #define SSS_FCINTENCLR_HRDMAINTENCLR    _BIT(1)
  55 #define SSS_FCINTENCLR_PKDMAINTENCLR    _BIT(0)
  56
  57 #define SSS_REG_FCINTPEND               0x000C
  58 #define SSS_FCINTPEND_BRDMAINTP         _BIT(3)
  59 #define SSS_FCINTPEND_BTDMAINTP         _BIT(2)
  60 #define SSS_FCINTPEND_HRDMAINTP         _BIT(1)
  61 #define SSS_FCINTPEND_PKDMAINTP         _BIT(0)
  62
  63 #define SSS_REG_FCFIFOSTAT              0x0010
  64 #define SSS_FCFIFOSTAT_BRFIFOFUL        _BIT(7)
  65 #define SSS_FCFIFOSTAT_BRFIFOEMP        _BIT(6)
  66 #define SSS_FCFIFOSTAT_BTFIFOFUL        _BIT(5)
  67 #define SSS_FCFIFOSTAT_BTFIFOEMP        _BIT(4)
  68 #define SSS_FCFIFOSTAT_HRFIFOFUL        _BIT(3)
  69 #define SSS_FCFIFOSTAT_HRFIFOEMP        _BIT(2)
  70 #define SSS_FCFIFOSTAT_PKFIFOFUL        _BIT(1)
  71 #define SSS_FCFIFOSTAT_PKFIFOEMP        _BIT(0)
  72
  73 #define SSS_REG_FCFIFOCTRL              0x0014
  74 #define SSS_FCFIFOCTRL_DESSEL           _BIT(2)
  75 #define SSS_HASHIN_INDEPENDENT          _SBF(0, 0x00)
  76 #define SSS_HASHIN_CIPHER_INPUT         _SBF(0, 0x01)
  77 #define SSS_HASHIN_CIPHER_OUTPUT        _SBF(0, 0x02)
  78
  79 #define SSS_REG_FCBRDMAS                0x0020
  80 #define SSS_REG_FCBRDMAL                0x0024
  81 #define SSS_REG_FCBRDMAC                0x0028
  82 #define SSS_FCBRDMAC_BYTESWAP           _BIT(1)
  83 #define SSS_FCBRDMAC_FLUSH              _BIT(0)
  84
  85 #define SSS_REG_FCBTDMAS                0x0030
  86 #define SSS_REG_FCBTDMAL                0x0034
  87 #define SSS_REG_FCBTDMAC                0x0038
  88 #define SSS_FCBTDMAC_BYTESWAP           _BIT(1)
  89 #define SSS_FCBTDMAC_FLUSH              _BIT(0)
  90
  91 #define SSS_REG_FCHRDMAS                0x0040
  92 #define SSS_REG_FCHRDMAL                0x0044
  93 #define SSS_REG_FCHRDMAC                0x0048
  94 #define SSS_FCHRDMAC_BYTESWAP           _BIT(1)
  95 #define SSS_FCHRDMAC_FLUSH              _BIT(0)
  96
  97 #define SSS_REG_FCPKDMAS                0x0050
  98 #define SSS_REG_FCPKDMAL                0x0054
  99 #define SSS_REG_FCPKDMAC                0x0058
 100 #define SSS_FCPKDMAC_BYTESWAP           _BIT(3)
 101 #define SSS_FCPKDMAC_DESCEND            _BIT(2)
 102 #define SSS_FCPKDMAC_TRANSMIT           _BIT(1)
 103 #define SSS_FCPKDMAC_FLUSH              _BIT(0)
 104
 105 #define SSS_REG_FCPKDMAO                0x005C
 106
 107 /* AES registers */
 108 #define SSS_REG_AES_CONTROL             0x4000
 109 #define SSS_AES_BYTESWAP_DI             _BIT(11)
 110 #define SSS_AES_BYTESWAP_DO             _BIT(10)
 111 #define SSS_AES_BYTESWAP_IV             _BIT(9)
 112 #define SSS_AES_BYTESWAP_CNT            _BIT(8)
 113 #define SSS_AES_BYTESWAP_KEY            _BIT(7)
 114 #define SSS_AES_KEY_CHANGE_MODE         _BIT(6)
 115 #define SSS_AES_KEY_SIZE_128            _SBF(4, 0x00)
 116 #define SSS_AES_KEY_SIZE_192            _SBF(4, 0x01)
 117 #define SSS_AES_KEY_SIZE_256            _SBF(4, 0x02)
 118 #define SSS_AES_FIFO_MODE               _BIT(3)
 119 #define SSS_AES_CHAIN_MODE_ECB          _SBF(1, 0x00)
 120 #define SSS_AES_CHAIN_MODE_CBC          _SBF(1, 0x01)
 121 #define SSS_AES_CHAIN_MODE_CTR          _SBF(1, 0x02)
 122 #define SSS_AES_MODE_DECRYPT            _BIT(0)
 123
 124 #define SSS_REG_AES_STATUS              0x4004
 125 #define SSS_AES_BUSY                    _BIT(2)
 126 #define SSS_AES_INPUT_READY             _BIT(1)
 127 #define SSS_AES_OUTPUT_READY            _BIT(0)
 128
 129 #define SSS_REG_AES_IN_DATA(s)          (0x4010 + (s << 2))
 130 #define SSS_REG_AES_OUT_DATA(s)         (0x4020 + (s << 2))
 131 #define SSS_REG_AES_IV_DATA(s)          (0x4030 + (s << 2))
 132 #define SSS_REG_AES_CNT_DATA(s)         (0x4040 + (s << 2))
 133 #define SSS_REG_AES_KEY_DATA(s)         (0x4080 + (s << 2))
 134
 135 #define SSS_REG(dev, reg)               ((dev)->ioaddr + (SSS_REG_##reg))
 136 #define SSS_READ(dev, reg)              __raw_readl(SSS_REG(dev, reg))
 137 #define SSS_WRITE(dev, reg, val)        __raw_writel((val), SSS_REG(dev, reg))
 138
 139 /* HW engine modes */
 140 #define FLAGS_AES_DECRYPT               _BIT(0)
 141 #define FLAGS_AES_MODE_MASK             _SBF(1, 0x03)
 142 #define FLAGS_AES_CBC                   _SBF(1, 0x01)
 143 #define FLAGS_AES_CTR                   _SBF(1, 0x02)
 144
 145 #define AES_KEY_LEN         16
 146 #define CRYPTO_QUEUE_LEN    1
 147
 148 struct s5p_aes_reqctx {
 149         unsigned long mode;
 150 };
 151
 152 struct s5p_aes_ctx {
 153         struct s5p_aes_dev         *dev;
 154
 155         uint8_t                     aes_key[AES_MAX_KEY_SIZE];
 156         uint8_t                     nonce[CTR_RFC3686_NONCE_SIZE];
 157         int                         keylen;
 158 };
 159
 160 struct s5p_aes_dev {
 161         struct device              *dev;
 162         struct clk                 *clk;
 163         void __iomem               *ioaddr;
 164         int                         irq_hash;
 165         int                         irq_fc;
 166
 167         struct ablkcipher_request  *req;
 168         struct s5p_aes_ctx         *ctx;
 169         struct scatterlist         *sg_src;
 170         struct scatterlist         *sg_dst;
 171
 172         struct tasklet_struct       tasklet;
 173         struct crypto_queue         queue;
 174         bool                        busy;
 175         spinlock_t                  lock;
 176 };
 177
 178 static struct s5p_aes_dev *s5p_dev;
 179
 180 static void s5p_set_dma_indata(struct s5p_aes_dev *dev, struct scatterlist *sg)
 181 {
 182         SSS_WRITE(dev, FCBRDMAS, sg_dma_address(sg));
 183         SSS_WRITE(dev, FCBRDMAL, sg_dma_len(sg));
 184 }
 185
 186 static void s5p_set_dma_outdata(struct s5p_aes_dev *dev, struct scatterlist *sg)
 187 {
 188         SSS_WRITE(dev, FCBTDMAS, sg_dma_address(sg));
 189         SSS_WRITE(dev, FCBTDMAL, sg_dma_len(sg));
 190 }
 191
 192 static void s5p_aes_complete(struct s5p_aes_dev *dev, int err)
 193 {
 194         /* holding a lock outside */
 195         dev->req->base.complete(&dev->req->base, err);
 196         dev->busy = false;
 197 }
 198
 199 static void s5p_unset_outdata(struct s5p_aes_dev *dev)
 200 {
 201         dma_unmap_sg(dev->dev, dev->sg_dst, 1, DMA_FROM_DEVICE);
 202 }
 203
 204 static void s5p_unset_indata(struct s5p_aes_dev *dev)
 205 {
 206         dma_unmap_sg(dev->dev, dev->sg_src, 1, DMA_TO_DEVICE);
 207 }
 208
 209 static int s5p_set_outdata(struct s5p_aes_dev *dev, struct scatterlist *sg)
 210 {
 211         int err;
 212
 213         if (!IS_ALIGNED(sg_dma_len(sg), AES_BLOCK_SIZE)) {
 214                 err = -EINVAL;
 215                 goto exit;
 216         }
 217         if (!sg_dma_len(sg)) {
 218                 err = -EINVAL;
 219                 goto exit;
 220         }
 221
 222         err = dma_map_sg(dev->dev, sg, 1, DMA_FROM_DEVICE);
 223         if (!err) {
 224                 err = -ENOMEM;
 225                 goto exit;
 226         }
 227
 228         dev->sg_dst = sg;
 229         err = 0;
 230
 231  exit:
 232         return err;
 233 }
 234
 235 static int s5p_set_indata(struct s5p_aes_dev *dev, struct scatterlist *sg)
 236 {
 237         int err;
 238
 239         if (!IS_ALIGNED(sg_dma_len(sg), AES_BLOCK_SIZE)) {
 240                 err = -EINVAL;
 241                 goto exit;
 242         }
 243         if (!sg_dma_len(sg)) {
 244                 err = -EINVAL;
 245                 goto exit;
 246         }
 247
 248         err = dma_map_sg(dev->dev, sg, 1, DMA_TO_DEVICE);
 249         if (!err) {
 250                 err = -ENOMEM;
 251                 goto exit;
 252         }
 253
 254         dev->sg_src = sg;
 255         err = 0;
 256
 257  exit:
 258         return err;
 259 }
 260
 261 static void s5p_aes_tx(struct s5p_aes_dev *dev)
 262 {
 263         int err = 0;
 264
 265         s5p_unset_outdata(dev);
 266
 267         if (!sg_is_last(dev->sg_dst)) {
 268                 err = s5p_set_outdata(dev, sg_next(dev->sg_dst));
 269                 if (err) {
 270                         s5p_aes_complete(dev, err);
 271                         return;
 272                 }
 273
 274                 s5p_set_dma_outdata(dev, dev->sg_dst);
 275         } else
 276                 s5p_aes_complete(dev, err);
 277 }
 278
 279 static void s5p_aes_rx(struct s5p_aes_dev *dev)
 280 {
 281         int err;
 282
 283         s5p_unset_indata(dev);
 284
 285         if (!sg_is_last(dev->sg_src)) {
 286                 err = s5p_set_indata(dev, sg_next(dev->sg_src));
 287                 if (err) {
 288                         s5p_aes_complete(dev, err);
 289                         return;
 290                 }
 291
 292                 s5p_set_dma_indata(dev, dev->sg_src);
 293         }
 294 }
 295
 296 static irqreturn_t s5p_aes_interrupt(int irq, void *dev_id)
 297 {
 298         struct platform_device *pdev = dev_id;
 299         struct s5p_aes_dev     *dev  = platform_get_drvdata(pdev);
 300         uint32_t                status;
 301         unsigned long           flags;
 302
 303         spin_lock_irqsave(&dev->lock, flags);
 304
 305         if (irq == dev->irq_fc) {
 306                 status = SSS_READ(dev, FCINTSTAT);
 307                 if (status & SSS_FCINTSTAT_BRDMAINT)
 308                         s5p_aes_rx(dev);
 309                 if (status & SSS_FCINTSTAT_BTDMAINT)
 310                         s5p_aes_tx(dev);
 311
 312                 SSS_WRITE(dev, FCINTPEND, status);
 313         }
 314
 315         spin_unlock_irqrestore(&dev->lock, flags);
 316
 317         return IRQ_HANDLED;
 318 }
 319
 320 static void s5p_set_aes(struct s5p_aes_dev *dev,
 321                         uint8_t *key, uint8_t *iv, unsigned int keylen)
 322 {
 323         void __iomem *keystart;
 324
 325         memcpy(dev->ioaddr + SSS_REG_AES_IV_DATA(0), iv, 0x10);
 326
 327         if (keylen == AES_KEYSIZE_256)
 328                 keystart = dev->ioaddr + SSS_REG_AES_KEY_DATA(0);
 329         else if (keylen == AES_KEYSIZE_192)
 330                 keystart = dev->ioaddr + SSS_REG_AES_KEY_DATA(2);
 331         else
 332                 keystart = dev->ioaddr + SSS_REG_AES_KEY_DATA(4);
 333
 334         memcpy(keystart, key, keylen);
 335 }
 336
 337 static void s5p_aes_crypt_start(struct s5p_aes_dev *dev, unsigned long mode)
 338 {
 339         struct ablkcipher_request  *req = dev->req;
 340
 341         uint32_t                    aes_control;
 342         int                         err;
 343         unsigned long               flags;
 344
 345         aes_control = SSS_AES_KEY_CHANGE_MODE;
 346         if (mode & FLAGS_AES_DECRYPT)
 347                 aes_control |= SSS_AES_MODE_DECRYPT;
 348
 349         if ((mode & FLAGS_AES_MODE_MASK) == FLAGS_AES_CBC)
 350                 aes_control |= SSS_AES_CHAIN_MODE_CBC;
 351         else if ((mode & FLAGS_AES_MODE_MASK) == FLAGS_AES_CTR)
 352                 aes_control |= SSS_AES_CHAIN_MODE_CTR;
 353
 354         if (dev->ctx->keylen == AES_KEYSIZE_192)
 355                 aes_control |= SSS_AES_KEY_SIZE_192;
 356         else if (dev->ctx->keylen == AES_KEYSIZE_256)
 357                 aes_control |= SSS_AES_KEY_SIZE_256;
 358
 359         aes_control |= SSS_AES_FIFO_MODE;
 360
 361         /* as a variant it is possible to use byte swapping on DMA side */
 362         aes_control |= SSS_AES_BYTESWAP_DI
 363                     |  SSS_AES_BYTESWAP_DO
 364                     |  SSS_AES_BYTESWAP_IV
 365                     |  SSS_AES_BYTESWAP_KEY
 366                     |  SSS_AES_BYTESWAP_CNT;
 367
 368         spin_lock_irqsave(&dev->lock, flags);
 369
 370         SSS_WRITE(dev, FCINTENCLR,
 371                   SSS_FCINTENCLR_BTDMAINTENCLR | SSS_FCINTENCLR_BRDMAINTENCLR);
 372         SSS_WRITE(dev, FCFIFOCTRL, 0x00);
 373
 374         err = s5p_set_indata(dev, req->src);
 375         if (err)
 376                 goto indata_error;
 377
 378         err = s5p_set_outdata(dev, req->dst);
 379         if (err)
 380                 goto outdata_error;
 381
 382         SSS_WRITE(dev, AES_CONTROL, aes_control);
 383         s5p_set_aes(dev, dev->ctx->aes_key, req->info, dev->ctx->keylen);
 384
 385         s5p_set_dma_indata(dev,  req->src);
 386         s5p_set_dma_outdata(dev, req->dst);
 387
 388         SSS_WRITE(dev, FCINTENSET,
 389                   SSS_FCINTENSET_BTDMAINTENSET | SSS_FCINTENSET_BRDMAINTENSET);
 390
 391         spin_unlock_irqrestore(&dev->lock, flags);
 392
 393         return;
 394
 395  outdata_error:
 396         s5p_unset_indata(dev);
 397
 398  indata_error:
 399         s5p_aes_complete(dev, err);
 400         spin_unlock_irqrestore(&dev->lock, flags);
 401 }
 402
 403 static void s5p_tasklet_cb(unsigned long data)
 404 {
 405         struct s5p_aes_dev *dev = (struct s5p_aes_dev *)data;
 406         struct crypto_async_request *async_req, *backlog;
 407         struct s5p_aes_reqctx *reqctx;
 408         unsigned long flags;
 409
 410         spin_lock_irqsave(&dev->lock, flags);
 411         backlog   = crypto_get_backlog(&dev->queue);
 412         async_req = crypto_dequeue_request(&dev->queue);
 413         spin_unlock_irqrestore(&dev->lock, flags);
 414
 415         if (!async_req)
 416                 return;
 417
 418         if (backlog)
 419                 backlog->complete(backlog, -EINPROGRESS);
 420
 421         dev->req = ablkcipher_request_cast(async_req);
 422         dev->ctx = crypto_tfm_ctx(dev->req->base.tfm);
 423         reqctx   = ablkcipher_request_ctx(dev->req);
 424
 425         s5p_aes_crypt_start(dev, reqctx->mode);
 426 }
 427
 428 static int s5p_aes_handle_req(struct s5p_aes_dev *dev,
 429                               struct ablkcipher_request *req)
 430 {
 431         unsigned long flags;
 432         int err;
 433
 434         spin_lock_irqsave(&dev->lock, flags);
 435         if (dev->busy) {
 436                 err = -EAGAIN;
 437                 spin_unlock_irqrestore(&dev->lock, flags);
 438                 goto exit;
 439         }
 440         dev->busy = true;
 441
 442         err = ablkcipher_enqueue_request(&dev->queue, req);
 443         spin_unlock_irqrestore(&dev->lock, flags);
 444
 445         tasklet_schedule(&dev->tasklet);
 446
 447  exit:
 448         return err;
 449 }
 450
 451 static int s5p_aes_crypt(struct ablkcipher_request *req, unsigned long mode)
 452 {
 453         struct crypto_ablkcipher   *tfm    = crypto_ablkcipher_reqtfm(req);
 454         struct s5p_aes_ctx         *ctx    = crypto_ablkcipher_ctx(tfm);
 455         struct s5p_aes_reqctx      *reqctx = ablkcipher_request_ctx(req);
 456         struct s5p_aes_dev         *dev    = ctx->dev;
 457
 458         if (!IS_ALIGNED(req->nbytes, AES_BLOCK_SIZE)) {
 459                 pr_err("request size is not exact amount of AES blocks\n");
 460                 return -EINVAL;
 461         }
 462
 463         reqctx->mode = mode;
 464
 465         return s5p_aes_handle_req(dev, req);
 466 }
 467
 468 static int s5p_aes_setkey(struct crypto_ablkcipher *cipher,
 469                           const uint8_t *key, unsigned int keylen)
 470 {
 471         struct crypto_tfm  *tfm = crypto_ablkcipher_tfm(cipher);
 472         struct s5p_aes_ctx *ctx = crypto_tfm_ctx(tfm);
 473
 474         if (keylen != AES_KEYSIZE_128 &&
 475             keylen != AES_KEYSIZE_192 &&
 476             keylen != AES_KEYSIZE_256)
 477                 return -EINVAL;
 478
 479         memcpy(ctx->aes_key, key, keylen);
 480         ctx->keylen = keylen;
 481
 482         return 0;
 483 }
 484
 485 static int s5p_aes_ecb_encrypt(struct ablkcipher_request *req)
 486 {
 487         return s5p_aes_crypt(req, 0);
 488 }
 489
 490 static int s5p_aes_ecb_decrypt(struct ablkcipher_request *req)
 491 {
 492         return s5p_aes_crypt(req, FLAGS_AES_DECRYPT);
 493 }
 494
 495 static int s5p_aes_cbc_encrypt(struct ablkcipher_request *req)
 496 {
 497         return s5p_aes_crypt(req, FLAGS_AES_CBC);
 498 }
 499
 500 static int s5p_aes_cbc_decrypt(struct ablkcipher_request *req)
 501 {
 502         return s5p_aes_crypt(req, FLAGS_AES_DECRYPT | FLAGS_AES_CBC);
 503 }
 504
 505 static int s5p_aes_cra_init(struct crypto_tfm *tfm)
 506 {
 507         struct s5p_aes_ctx  *ctx = crypto_tfm_ctx(tfm);
 508
 509         ctx->dev = s5p_dev;
 510         tfm->crt_ablkcipher.reqsize = sizeof(struct s5p_aes_reqctx);
 511
 512         return 0;
 513 }
 514
 515 static struct crypto_alg algs[] = {
 516         {
 517                 .cra_name               = "ecb(aes)",
 518                 .cra_driver_name        = "ecb-aes-s5p",
 519                 .cra_priority           = 100,
 520                 .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER |
 521                                           CRYPTO_ALG_ASYNC,
 522                 .cra_blocksize          = AES_BLOCK_SIZE,
 523                 .cra_ctxsize            = sizeof(struct s5p_aes_ctx),
 524                 .cra_alignmask          = 0x0f,
 525                 .cra_type               = &crypto_ablkcipher_type,
 526                 .cra_module             = THIS_MODULE,
 527                 .cra_init               = s5p_aes_cra_init,
 528                 .cra_u.ablkcipher = {
 529                         .min_keysize    = AES_MIN_KEY_SIZE,
 530                         .max_keysize    = AES_MAX_KEY_SIZE,
 531                         .setkey         = s5p_aes_setkey,
 532                         .encrypt        = s5p_aes_ecb_encrypt,
 533                         .decrypt        = s5p_aes_ecb_decrypt,
 534                 }
 535         },
 536         {
 537                 .cra_name               = "cbc(aes)",
 538                 .cra_driver_name        = "cbc-aes-s5p",
 539                 .cra_priority           = 100,
 540                 .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER |
 541                                           CRYPTO_ALG_ASYNC,
 542                 .cra_blocksize          = AES_BLOCK_SIZE,
 543                 .cra_ctxsize            = sizeof(struct s5p_aes_ctx),
 544                 .cra_alignmask          = 0x0f,
 545                 .cra_type               = &crypto_ablkcipher_type,
 546                 .cra_module             = THIS_MODULE,
 547                 .cra_init               = s5p_aes_cra_init,
 548                 .cra_u.ablkcipher = {
 549                         .min_keysize    = AES_MIN_KEY_SIZE,
 550                         .max_keysize    = AES_MAX_KEY_SIZE,
 551                         .ivsize         = AES_BLOCK_SIZE,
 552                         .setkey         = s5p_aes_setkey,
 553                         .encrypt        = s5p_aes_cbc_encrypt,
 554                         .decrypt        = s5p_aes_cbc_decrypt,
 555                 }
 556         },
 557 };
 558
 559 static int s5p_aes_probe(struct platform_device *pdev)
 560 {
 561         int                 i, j, err = -ENODEV;
 562         struct s5p_aes_dev *pdata;
 563         struct device      *dev = &pdev->dev;
 564         struct resource    *res;
 565
 566         if (s5p_dev)
 567                 return -EEXIST;
 568
 569         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 570         if (!res)
 571                 return -ENODEV;
 572
 573         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 574         if (!pdata)
 575                 return -ENOMEM;
 576
 577         if (!devm_request_mem_region(dev, res->start,
 578                                      resource_size(res), pdev->name))
 579                 return -EBUSY;
 580
 581         pdata->clk = clk_get(dev, "secss");
 582         if (IS_ERR(pdata->clk)) {
 583                 dev_err(dev, "failed to find secss clock source\n");
 584                 return -ENOENT;
 585         }
 586
 587         clk_enable(pdata->clk);
 588
 589         spin_lock_init(&pdata->lock);
 590         pdata->ioaddr = devm_ioremap(dev, res->start,
 591                                      resource_size(res));
 592
 593         pdata->irq_hash = platform_get_irq_byname(pdev, "hash");
 594         if (pdata->irq_hash < 0) {
 595                 err = pdata->irq_hash;
 596                 dev_warn(dev, "hash interrupt is not available.\n");
 597                 goto err_irq;
 598         }
 599         err = devm_request_irq(dev, pdata->irq_hash, s5p_aes_interrupt,
 600                                IRQF_SHARED, pdev->name, pdev);
 601         if (err < 0) {
 602                 dev_warn(dev, "hash interrupt is not available.\n");
 603                 goto err_irq;
 604         }
 605
 606         pdata->irq_fc = platform_get_irq_byname(pdev, "feed control");
 607         if (pdata->irq_fc < 0) {
 608                 err = pdata->irq_fc;
 609                 dev_warn(dev, "feed control interrupt is not available.\n");
 610                 goto err_irq;
 611         }
 612         err = devm_request_irq(dev, pdata->irq_fc, s5p_aes_interrupt,
 613                                IRQF_SHARED, pdev->name, pdev);
 614         if (err < 0) {
 615                 dev_warn(dev, "feed control interrupt is not available.\n");
 616                 goto err_irq;
 617         }
 618
 619         pdata->dev = dev;
 620         platform_set_drvdata(pdev, pdata);
 621         s5p_dev = pdata;
 622
 623         tasklet_init(&pdata->tasklet, s5p_tasklet_cb, (unsigned long)pdata);
 624         crypto_init_queue(&pdata->queue, CRYPTO_QUEUE_LEN);
 625
 626         for (i = 0; i < ARRAY_SIZE(algs); i++) {
 627                 INIT_LIST_HEAD(&algs[i].cra_list);
 628                 err = crypto_register_alg(&algs[i]);
 629                 if (err)
 630                         goto err_algs;
 631         }
 632
 633         pr_info("s5p-sss driver registered\n");
 634
 635         return 0;
 636
 637  err_algs:
 638         dev_err(dev, "can't register '%s': %d\n", algs[i].cra_name, err);
 639
 640         for (j = 0; j < i; j++)
 641                 crypto_unregister_alg(&algs[j]);
 642
 643         tasklet_kill(&pdata->tasklet);
 644
 645  err_irq:
 646         clk_disable(pdata->clk);
 647         clk_put(pdata->clk);
 648
 649         s5p_dev = NULL;
 650         platform_set_drvdata(pdev, NULL);
 651
 652         return err;
 653 }
 654
 655 static int s5p_aes_remove(struct platform_device *pdev)
 656 {
 657         struct s5p_aes_dev *pdata = platform_get_drvdata(pdev);
 658         int i;
 659
 660         if (!pdata)
 661                 return -ENODEV;
 662
 663         for (i = 0; i < ARRAY_SIZE(algs); i++)
 664                 crypto_unregister_alg(&algs[i]);
 665
 666         tasklet_kill(&pdata->tasklet);
 667
 668         clk_disable(pdata->clk);
 669         clk_put(pdata->clk);
 670
 671         s5p_dev = NULL;
 672         platform_set_drvdata(pdev, NULL);
 673
 674         return 0;
 675 }
 676
 677 static struct platform_driver s5p_aes_crypto = {
 678         .probe  = s5p_aes_probe,
 679         .remove = s5p_aes_remove,
 680         .driver = {
 681                 .owner  = THIS_MODULE,
 682                 .name   = "s5p-secss",
 683         },
 684 };
 685
 686 module_platform_driver(s5p_aes_crypto);
 687
 688 MODULE_DESCRIPTION("S5PV210 AES hw acceleration support.");
 689 MODULE_LICENSE("GPL v2");
 690 MODULE_AUTHOR("Vladimir Zapolskiy <vzapolskiy@gmail.com>");