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/clk.h>
  15 #include <linux/crypto.h>
  16 #include <linux/dma-mapping.h>
  17 #include <linux/err.h>
  18 #include <linux/errno.h>
  19 #include <linux/init.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/io.h>
  22 #include <linux/kernel.h>
  23 #include <linux/module.h>
  24 #include <linux/of.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/scatterlist.h>
  27
  28 #include <crypto/ctr.h>
  29 #include <crypto/aes.h>
  30 #include <crypto/algapi.h>
  31 #include <crypto/scatterwalk.h>
  32
  33 #define _SBF(s, v)                      ((v) << (s))
  34
  35 /* Feed control registers */
  36 #define SSS_REG_FCINTSTAT               0x0000
  37 #define SSS_FCINTSTAT_BRDMAINT          BIT(3)
  38 #define SSS_FCINTSTAT_BTDMAINT          BIT(2)
  39 #define SSS_FCINTSTAT_HRDMAINT          BIT(1)
  40 #define SSS_FCINTSTAT_PKDMAINT          BIT(0)
  41
  42 #define SSS_REG_FCINTENSET              0x0004
  43 #define SSS_FCINTENSET_BRDMAINTENSET    BIT(3)
  44 #define SSS_FCINTENSET_BTDMAINTENSET    BIT(2)
  45 #define SSS_FCINTENSET_HRDMAINTENSET    BIT(1)
  46 #define SSS_FCINTENSET_PKDMAINTENSET    BIT(0)
  47
  48 #define SSS_REG_FCINTENCLR              0x0008
  49 #define SSS_FCINTENCLR_BRDMAINTENCLR    BIT(3)
  50 #define SSS_FCINTENCLR_BTDMAINTENCLR    BIT(2)
  51 #define SSS_FCINTENCLR_HRDMAINTENCLR    BIT(1)
  52 #define SSS_FCINTENCLR_PKDMAINTENCLR    BIT(0)
  53
  54 #define SSS_REG_FCINTPEND               0x000C
  55 #define SSS_FCINTPEND_BRDMAINTP         BIT(3)
  56 #define SSS_FCINTPEND_BTDMAINTP         BIT(2)
  57 #define SSS_FCINTPEND_HRDMAINTP         BIT(1)
  58 #define SSS_FCINTPEND_PKDMAINTP         BIT(0)
  59
  60 #define SSS_REG_FCFIFOSTAT              0x0010
  61 #define SSS_FCFIFOSTAT_BRFIFOFUL        BIT(7)
  62 #define SSS_FCFIFOSTAT_BRFIFOEMP        BIT(6)
  63 #define SSS_FCFIFOSTAT_BTFIFOFUL        BIT(5)
  64 #define SSS_FCFIFOSTAT_BTFIFOEMP        BIT(4)
  65 #define SSS_FCFIFOSTAT_HRFIFOFUL        BIT(3)
  66 #define SSS_FCFIFOSTAT_HRFIFOEMP        BIT(2)
  67 #define SSS_FCFIFOSTAT_PKFIFOFUL        BIT(1)
  68 #define SSS_FCFIFOSTAT_PKFIFOEMP        BIT(0)
  69
  70 #define SSS_REG_FCFIFOCTRL              0x0014
  71 #define SSS_FCFIFOCTRL_DESSEL           BIT(2)
  72 #define SSS_HASHIN_INDEPENDENT          _SBF(0, 0x00)
  73 #define SSS_HASHIN_CIPHER_INPUT         _SBF(0, 0x01)
  74 #define SSS_HASHIN_CIPHER_OUTPUT        _SBF(0, 0x02)
  75
  76 #define SSS_REG_FCBRDMAS                0x0020
  77 #define SSS_REG_FCBRDMAL                0x0024
  78 #define SSS_REG_FCBRDMAC                0x0028
  79 #define SSS_FCBRDMAC_BYTESWAP           BIT(1)
  80 #define SSS_FCBRDMAC_FLUSH              BIT(0)
  81
  82 #define SSS_REG_FCBTDMAS                0x0030
  83 #define SSS_REG_FCBTDMAL                0x0034
  84 #define SSS_REG_FCBTDMAC                0x0038
  85 #define SSS_FCBTDMAC_BYTESWAP           BIT(1)
  86 #define SSS_FCBTDMAC_FLUSH              BIT(0)
  87
  88 #define SSS_REG_FCHRDMAS                0x0040
  89 #define SSS_REG_FCHRDMAL                0x0044
  90 #define SSS_REG_FCHRDMAC                0x0048
  91 #define SSS_FCHRDMAC_BYTESWAP           BIT(1)
  92 #define SSS_FCHRDMAC_FLUSH              BIT(0)
  93
  94 #define SSS_REG_FCPKDMAS                0x0050
  95 #define SSS_REG_FCPKDMAL                0x0054
  96 #define SSS_REG_FCPKDMAC                0x0058
  97 #define SSS_FCPKDMAC_BYTESWAP           BIT(3)
  98 #define SSS_FCPKDMAC_DESCEND            BIT(2)
  99 #define SSS_FCPKDMAC_TRANSMIT           BIT(1)
 100 #define SSS_FCPKDMAC_FLUSH              BIT(0)
 101
 102 #define SSS_REG_FCPKDMAO                0x005C
 103
 104 /* AES registers */
 105 #define SSS_REG_AES_CONTROL             0x00
 106 #define SSS_AES_BYTESWAP_DI             BIT(11)
 107 #define SSS_AES_BYTESWAP_DO             BIT(10)
 108 #define SSS_AES_BYTESWAP_IV             BIT(9)
 109 #define SSS_AES_BYTESWAP_CNT            BIT(8)
 110 #define SSS_AES_BYTESWAP_KEY            BIT(7)
 111 #define SSS_AES_KEY_CHANGE_MODE         BIT(6)
 112 #define SSS_AES_KEY_SIZE_128            _SBF(4, 0x00)
 113 #define SSS_AES_KEY_SIZE_192            _SBF(4, 0x01)
 114 #define SSS_AES_KEY_SIZE_256            _SBF(4, 0x02)
 115 #define SSS_AES_FIFO_MODE               BIT(3)
 116 #define SSS_AES_CHAIN_MODE_ECB          _SBF(1, 0x00)
 117 #define SSS_AES_CHAIN_MODE_CBC          _SBF(1, 0x01)
 118 #define SSS_AES_CHAIN_MODE_CTR          _SBF(1, 0x02)
 119 #define SSS_AES_MODE_DECRYPT            BIT(0)
 120
 121 #define SSS_REG_AES_STATUS              0x04
 122 #define SSS_AES_BUSY                    BIT(2)
 123 #define SSS_AES_INPUT_READY             BIT(1)
 124 #define SSS_AES_OUTPUT_READY            BIT(0)
 125
 126 #define SSS_REG_AES_IN_DATA(s)          (0x10 + (s << 2))
 127 #define SSS_REG_AES_OUT_DATA(s)         (0x20 + (s << 2))
 128 #define SSS_REG_AES_IV_DATA(s)          (0x30 + (s << 2))
 129 #define SSS_REG_AES_CNT_DATA(s)         (0x40 + (s << 2))
 130 #define SSS_REG_AES_KEY_DATA(s)         (0x80 + (s << 2))
 131
 132 #define SSS_REG(dev, reg)               ((dev)->ioaddr + (SSS_REG_##reg))
 133 #define SSS_READ(dev, reg)              __raw_readl(SSS_REG(dev, reg))
 134 #define SSS_WRITE(dev, reg, val)        __raw_writel((val), SSS_REG(dev, reg))
 135
 136 #define SSS_AES_REG(dev, reg)           ((dev)->aes_ioaddr + SSS_REG_##reg)
 137 #define SSS_AES_WRITE(dev, reg, val)    __raw_writel((val), \
 138                                                 SSS_AES_REG(dev, reg))
 139
 140 /* HW engine modes */
 141 #define FLAGS_AES_DECRYPT               BIT(0)
 142 #define FLAGS_AES_MODE_MASK             _SBF(1, 0x03)
 143 #define FLAGS_AES_CBC                   _SBF(1, 0x01)
 144 #define FLAGS_AES_CTR                   _SBF(1, 0x02)
 145
 146 #define AES_KEY_LEN         16
 147 #define CRYPTO_QUEUE_LEN    1
 148
 149 /**
 150  * struct samsung_aes_variant - platform specific SSS driver data
 151  * @aes_offset: AES register offset from SSS module's base.
 152  *
 153  * Specifies platform specific configuration of SSS module.
 154  * Note: A structure for driver specific platform data is used for future
 155  * expansion of its usage.
 156  */
 157 struct samsung_aes_variant {
 158         unsigned int                    aes_offset;
 159 };
 160
 161 struct s5p_aes_reqctx {
 162         unsigned long                   mode;
 163 };
 164
 165 struct s5p_aes_ctx {
 166         struct s5p_aes_dev              *dev;
 167
 168         uint8_t                         aes_key[AES_MAX_KEY_SIZE];
 169         uint8_t                         nonce[CTR_RFC3686_NONCE_SIZE];
 170         int                             keylen;
 171 };
 172
 173 struct s5p_aes_dev {
 174         struct device                   *dev;
 175         struct clk                      *clk;
 176         void __iomem                    *ioaddr;
 177         void __iomem                    *aes_ioaddr;
 178         int                             irq_fc;
 179
 180         struct ablkcipher_request       *req;
 181         struct s5p_aes_ctx              *ctx;
 182         struct scatterlist              *sg_src;
 183         struct scatterlist              *sg_dst;
 184
 185         /* In case of unaligned access: */
 186         struct scatterlist              *sg_src_cpy;
 187         struct scatterlist              *sg_dst_cpy;
 188
 189         struct tasklet_struct           tasklet;
 190         struct crypto_queue             queue;
 191         bool                            busy;
 192         spinlock_t                      lock;
 193
 194         struct samsung_aes_variant      *variant;
 195 };
 196
 197 static struct s5p_aes_dev *s5p_dev;
 198
 199 static const struct samsung_aes_variant s5p_aes_data = {
 200         .aes_offset     = 0x4000,
 201 };
 202
 203 static const struct samsung_aes_variant exynos_aes_data = {
 204         .aes_offset     = 0x200,
 205 };
 206
 207 static const struct of_device_id s5p_sss_dt_match[] = {
 208         {
 209                 .compatible = "samsung,s5pv210-secss",
 210                 .data = &s5p_aes_data,
 211         },
 212         {
 213                 .compatible = "samsung,exynos4210-secss",
 214                 .data = &exynos_aes_data,
 215         },
 216         { },
 217 };
 218 MODULE_DEVICE_TABLE(of, s5p_sss_dt_match);
 219
 220 static inline struct samsung_aes_variant *find_s5p_sss_version
 221                                    (struct platform_device *pdev)
 222 {
 223         if (IS_ENABLED(CONFIG_OF) && (pdev->dev.of_node)) {
 224                 const struct of_device_id *match;
 225
 226                 match = of_match_node(s5p_sss_dt_match,
 227                                         pdev->dev.of_node);
 228                 return (struct samsung_aes_variant *)match->data;
 229         }
 230         return (struct samsung_aes_variant *)
 231                         platform_get_device_id(pdev)->driver_data;
 232 }
 233
 234 static void s5p_set_dma_indata(struct s5p_aes_dev *dev, struct scatterlist *sg)
 235 {
 236         SSS_WRITE(dev, FCBRDMAS, sg_dma_address(sg));
 237         SSS_WRITE(dev, FCBRDMAL, sg_dma_len(sg));
 238 }
 239
 240 static void s5p_set_dma_outdata(struct s5p_aes_dev *dev, struct scatterlist *sg)
 241 {
 242         SSS_WRITE(dev, FCBTDMAS, sg_dma_address(sg));
 243         SSS_WRITE(dev, FCBTDMAL, sg_dma_len(sg));
 244 }
 245
 246 static void s5p_free_sg_cpy(struct s5p_aes_dev *dev, struct scatterlist **sg)
 247 {
 248         int len;
 249
 250         if (!*sg)
 251                 return;
 252
 253         len = ALIGN(dev->req->nbytes, AES_BLOCK_SIZE);
 254         free_pages((unsigned long)sg_virt(*sg), get_order(len));
 255
 256         kfree(*sg);
 257         *sg = NULL;
 258 }
 259
 260 static void s5p_sg_copy_buf(void *buf, struct scatterlist *sg,
 261                             unsigned int nbytes, int out)
 262 {
 263         struct scatter_walk walk;
 264
 265         if (!nbytes)
 266                 return;
 267
 268         scatterwalk_start(&walk, sg);
 269         scatterwalk_copychunks(buf, &walk, nbytes, out);
 270         scatterwalk_done(&walk, out, 0);
 271 }
 272
 273 static void s5p_sg_done(struct s5p_aes_dev *dev)
 274 {
 275         if (dev->sg_dst_cpy) {
 276                 dev_dbg(dev->dev,
 277                         "Copying %d bytes of output data back to original place\n",
 278                         dev->req->nbytes);
 279                 s5p_sg_copy_buf(sg_virt(dev->sg_dst_cpy), dev->req->dst,
 280                                 dev->req->nbytes, 1);
 281         }
 282         s5p_free_sg_cpy(dev, &dev->sg_src_cpy);
 283         s5p_free_sg_cpy(dev, &dev->sg_dst_cpy);
 284 }
 285
 286 /* Calls the completion. Cannot be called with dev->lock hold. */
 287 static void s5p_aes_complete(struct s5p_aes_dev *dev, int err)
 288 {
 289         dev->req->base.complete(&dev->req->base, err);
 290 }
 291
 292 static void s5p_unset_outdata(struct s5p_aes_dev *dev)
 293 {
 294         dma_unmap_sg(dev->dev, dev->sg_dst, 1, DMA_FROM_DEVICE);
 295 }
 296
 297 static void s5p_unset_indata(struct s5p_aes_dev *dev)
 298 {
 299         dma_unmap_sg(dev->dev, dev->sg_src, 1, DMA_TO_DEVICE);
 300 }
 301
 302 static int s5p_make_sg_cpy(struct s5p_aes_dev *dev, struct scatterlist *src,
 303                             struct scatterlist **dst)
 304 {
 305         void *pages;
 306         int len;
 307
 308         *dst = kmalloc(sizeof(**dst), GFP_ATOMIC);
 309         if (!*dst)
 310                 return -ENOMEM;
 311
 312         len = ALIGN(dev->req->nbytes, AES_BLOCK_SIZE);
 313         pages = (void *)__get_free_pages(GFP_ATOMIC, get_order(len));
 314         if (!pages) {
 315                 kfree(*dst);
 316                 *dst = NULL;
 317                 return -ENOMEM;
 318         }
 319
 320         s5p_sg_copy_buf(pages, src, dev->req->nbytes, 0);
 321
 322         sg_init_table(*dst, 1);
 323         sg_set_buf(*dst, pages, len);
 324
 325         return 0;
 326 }
 327
 328 static int s5p_set_outdata(struct s5p_aes_dev *dev, struct scatterlist *sg)
 329 {
 330         int err;
 331
 332         if (!sg->length) {
 333                 err = -EINVAL;
 334                 goto exit;
 335         }
 336
 337         err = dma_map_sg(dev->dev, sg, 1, DMA_FROM_DEVICE);
 338         if (!err) {
 339                 err = -ENOMEM;
 340                 goto exit;
 341         }
 342
 343         dev->sg_dst = sg;
 344         err = 0;
 345
 346 exit:
 347         return err;
 348 }
 349
 350 static int s5p_set_indata(struct s5p_aes_dev *dev, struct scatterlist *sg)
 351 {
 352         int err;
 353
 354         if (!sg->length) {
 355                 err = -EINVAL;
 356                 goto exit;
 357         }
 358
 359         err = dma_map_sg(dev->dev, sg, 1, DMA_TO_DEVICE);
 360         if (!err) {
 361                 err = -ENOMEM;
 362                 goto exit;
 363         }
 364
 365         dev->sg_src = sg;
 366         err = 0;
 367
 368 exit:
 369         return err;
 370 }
 371
 372 /*
 373  * Returns -ERRNO on error (mapping of new data failed).
 374  * On success returns:
 375  *  - 0 if there is no more data,
 376  *  - 1 if new transmitting (output) data is ready and its address+length
 377  *     have to be written to device (by calling s5p_set_dma_outdata()).
 378  */
 379 static int s5p_aes_tx(struct s5p_aes_dev *dev)
 380 {
 381         int ret = 0;
 382
 383         s5p_unset_outdata(dev);
 384
 385         if (!sg_is_last(dev->sg_dst)) {
 386                 ret = s5p_set_outdata(dev, sg_next(dev->sg_dst));
 387                 if (!ret)
 388                         ret = 1;
 389         }
 390
 391         return ret;
 392 }
 393
 394 /*
 395  * Returns -ERRNO on error (mapping of new data failed).
 396  * On success returns:
 397  *  - 0 if there is no more data,
 398  *  - 1 if new receiving (input) data is ready and its address+length
 399  *     have to be written to device (by calling s5p_set_dma_indata()).
 400  */
 401 static int s5p_aes_rx(struct s5p_aes_dev *dev/*, bool *set_dma*/)
 402 {
 403         int ret = 0;
 404
 405         s5p_unset_indata(dev);
 406
 407         if (!sg_is_last(dev->sg_src)) {
 408                 ret = s5p_set_indata(dev, sg_next(dev->sg_src));
 409                 if (!ret)
 410                         ret = 1;
 411         }
 412
 413         return ret;
 414 }
 415
 416 static irqreturn_t s5p_aes_interrupt(int irq, void *dev_id)
 417 {
 418         struct platform_device *pdev = dev_id;
 419         struct s5p_aes_dev *dev = platform_get_drvdata(pdev);
 420         int err_dma_tx = 0;
 421         int err_dma_rx = 0;
 422         bool tx_end = false;
 423         unsigned long flags;
 424         uint32_t status;
 425         int err;
 426
 427         spin_lock_irqsave(&dev->lock, flags);
 428
 429         /*
 430          * Handle rx or tx interrupt. If there is still data (scatterlist did not
 431          * reach end), then map next scatterlist entry.
 432          * In case of such mapping error, s5p_aes_complete() should be called.
 433          *
 434          * If there is no more data in tx scatter list, call s5p_aes_complete()
 435          * and schedule new tasklet.
 436          */
 437         status = SSS_READ(dev, FCINTSTAT);
 438         if (status & SSS_FCINTSTAT_BRDMAINT)
 439                 err_dma_rx = s5p_aes_rx(dev);
 440
 441         if (status & SSS_FCINTSTAT_BTDMAINT) {
 442                 if (sg_is_last(dev->sg_dst))
 443                         tx_end = true;
 444                 err_dma_tx = s5p_aes_tx(dev);
 445         }
 446
 447         SSS_WRITE(dev, FCINTPEND, status);
 448
 449         if (err_dma_rx < 0) {
 450                 err = err_dma_rx;
 451                 goto error;
 452         }
 453         if (err_dma_tx < 0) {
 454                 err = err_dma_tx;
 455                 goto error;
 456         }
 457
 458         if (tx_end) {
 459                 s5p_sg_done(dev);
 460
 461                 spin_unlock_irqrestore(&dev->lock, flags);
 462
 463                 s5p_aes_complete(dev, 0);
 464                 /* Device is still busy */
 465                 tasklet_schedule(&dev->tasklet);
 466         } else {
 467                 /*
 468                  * Writing length of DMA block (either receiving or
 469                  * transmitting) will start the operation immediately, so this
 470                  * should be done at the end (even after clearing pending
 471                  * interrupts to not miss the interrupt).
 472                  */
 473                 if (err_dma_tx == 1)
 474                         s5p_set_dma_outdata(dev, dev->sg_dst);
 475                 if (err_dma_rx == 1)
 476                         s5p_set_dma_indata(dev, dev->sg_src);
 477
 478                 spin_unlock_irqrestore(&dev->lock, flags);
 479         }
 480
 481         return IRQ_HANDLED;
 482
 483 error:
 484         s5p_sg_done(dev);
 485         dev->busy = false;
 486         spin_unlock_irqrestore(&dev->lock, flags);
 487         s5p_aes_complete(dev, err);
 488
 489         return IRQ_HANDLED;
 490 }
 491
 492 static void s5p_set_aes(struct s5p_aes_dev *dev,
 493                         uint8_t *key, uint8_t *iv, unsigned int keylen)
 494 {
 495         void __iomem *keystart;
 496
 497         if (iv)
 498                 memcpy_toio(dev->aes_ioaddr + SSS_REG_AES_IV_DATA(0), iv, 0x10);
 499
 500         if (keylen == AES_KEYSIZE_256)
 501                 keystart = dev->aes_ioaddr + SSS_REG_AES_KEY_DATA(0);
 502         else if (keylen == AES_KEYSIZE_192)
 503                 keystart = dev->aes_ioaddr + SSS_REG_AES_KEY_DATA(2);
 504         else
 505                 keystart = dev->aes_ioaddr + SSS_REG_AES_KEY_DATA(4);
 506
 507         memcpy_toio(keystart, key, keylen);
 508 }
 509
 510 static bool s5p_is_sg_aligned(struct scatterlist *sg)
 511 {
 512         while (sg) {
 513                 if (!IS_ALIGNED(sg->length, AES_BLOCK_SIZE))
 514                         return false;
 515                 sg = sg_next(sg);
 516         }
 517
 518         return true;
 519 }
 520
 521 static int s5p_set_indata_start(struct s5p_aes_dev *dev,
 522                                 struct ablkcipher_request *req)
 523 {
 524         struct scatterlist *sg;
 525         int err;
 526
 527         dev->sg_src_cpy = NULL;
 528         sg = req->src;
 529         if (!s5p_is_sg_aligned(sg)) {
 530                 dev_dbg(dev->dev,
 531                         "At least one unaligned source scatter list, making a copy\n");
 532                 err = s5p_make_sg_cpy(dev, sg, &dev->sg_src_cpy);
 533                 if (err)
 534                         return err;
 535
 536                 sg = dev->sg_src_cpy;
 537         }
 538
 539         err = s5p_set_indata(dev, sg);
 540         if (err) {
 541                 s5p_free_sg_cpy(dev, &dev->sg_src_cpy);
 542                 return err;
 543         }
 544
 545         return 0;
 546 }
 547
 548 static int s5p_set_outdata_start(struct s5p_aes_dev *dev,
 549                                 struct ablkcipher_request *req)
 550 {
 551         struct scatterlist *sg;
 552         int err;
 553
 554         dev->sg_dst_cpy = NULL;
 555         sg = req->dst;
 556         if (!s5p_is_sg_aligned(sg)) {
 557                 dev_dbg(dev->dev,
 558                         "At least one unaligned dest scatter list, making a copy\n");
 559                 err = s5p_make_sg_cpy(dev, sg, &dev->sg_dst_cpy);
 560                 if (err)
 561                         return err;
 562
 563                 sg = dev->sg_dst_cpy;
 564         }
 565
 566         err = s5p_set_outdata(dev, sg);
 567         if (err) {
 568                 s5p_free_sg_cpy(dev, &dev->sg_dst_cpy);
 569                 return err;
 570         }
 571
 572         return 0;
 573 }
 574
 575 static void s5p_aes_crypt_start(struct s5p_aes_dev *dev, unsigned long mode)
 576 {
 577         struct ablkcipher_request *req = dev->req;
 578         uint32_t aes_control;
 579         unsigned long flags;
 580         int err;
 581
 582         aes_control = SSS_AES_KEY_CHANGE_MODE;
 583         if (mode & FLAGS_AES_DECRYPT)
 584                 aes_control |= SSS_AES_MODE_DECRYPT;
 585
 586         if ((mode & FLAGS_AES_MODE_MASK) == FLAGS_AES_CBC)
 587                 aes_control |= SSS_AES_CHAIN_MODE_CBC;
 588         else if ((mode & FLAGS_AES_MODE_MASK) == FLAGS_AES_CTR)
 589                 aes_control |= SSS_AES_CHAIN_MODE_CTR;
 590
 591         if (dev->ctx->keylen == AES_KEYSIZE_192)
 592                 aes_control |= SSS_AES_KEY_SIZE_192;
 593         else if (dev->ctx->keylen == AES_KEYSIZE_256)
 594                 aes_control |= SSS_AES_KEY_SIZE_256;
 595
 596         aes_control |= SSS_AES_FIFO_MODE;
 597
 598         /* as a variant it is possible to use byte swapping on DMA side */
 599         aes_control |= SSS_AES_BYTESWAP_DI
 600                     |  SSS_AES_BYTESWAP_DO
 601                     |  SSS_AES_BYTESWAP_IV
 602                     |  SSS_AES_BYTESWAP_KEY
 603                     |  SSS_AES_BYTESWAP_CNT;
 604
 605         spin_lock_irqsave(&dev->lock, flags);
 606
 607         SSS_WRITE(dev, FCINTENCLR,
 608                   SSS_FCINTENCLR_BTDMAINTENCLR | SSS_FCINTENCLR_BRDMAINTENCLR);
 609         SSS_WRITE(dev, FCFIFOCTRL, 0x00);
 610
 611         err = s5p_set_indata_start(dev, req);
 612         if (err)
 613                 goto indata_error;
 614
 615         err = s5p_set_outdata_start(dev, req);
 616         if (err)
 617                 goto outdata_error;
 618
 619         SSS_AES_WRITE(dev, AES_CONTROL, aes_control);
 620         s5p_set_aes(dev, dev->ctx->aes_key, req->info, dev->ctx->keylen);
 621
 622         s5p_set_dma_indata(dev,  dev->sg_src);
 623         s5p_set_dma_outdata(dev, dev->sg_dst);
 624
 625         SSS_WRITE(dev, FCINTENSET,
 626                   SSS_FCINTENSET_BTDMAINTENSET | SSS_FCINTENSET_BRDMAINTENSET);
 627
 628         spin_unlock_irqrestore(&dev->lock, flags);
 629
 630         return;
 631
 632 outdata_error:
 633         s5p_unset_indata(dev);
 634
 635 indata_error:
 636         s5p_sg_done(dev);
 637         dev->busy = false;
 638         spin_unlock_irqrestore(&dev->lock, flags);
 639         s5p_aes_complete(dev, err);
 640 }
 641
 642 static void s5p_tasklet_cb(unsigned long data)
 643 {
 644         struct s5p_aes_dev *dev = (struct s5p_aes_dev *)data;
 645         struct crypto_async_request *async_req, *backlog;
 646         struct s5p_aes_reqctx *reqctx;
 647         unsigned long flags;
 648
 649         spin_lock_irqsave(&dev->lock, flags);
 650         backlog   = crypto_get_backlog(&dev->queue);
 651         async_req = crypto_dequeue_request(&dev->queue);
 652
 653         if (!async_req) {
 654                 dev->busy = false;
 655                 spin_unlock_irqrestore(&dev->lock, flags);
 656                 return;
 657         }
 658         spin_unlock_irqrestore(&dev->lock, flags);
 659
 660         if (backlog)
 661                 backlog->complete(backlog, -EINPROGRESS);
 662
 663         dev->req = ablkcipher_request_cast(async_req);
 664         dev->ctx = crypto_tfm_ctx(dev->req->base.tfm);
 665         reqctx   = ablkcipher_request_ctx(dev->req);
 666
 667         s5p_aes_crypt_start(dev, reqctx->mode);
 668 }
 669
 670 static int s5p_aes_handle_req(struct s5p_aes_dev *dev,
 671                               struct ablkcipher_request *req)
 672 {
 673         unsigned long flags;
 674         int err;
 675
 676         spin_lock_irqsave(&dev->lock, flags);
 677         err = ablkcipher_enqueue_request(&dev->queue, req);
 678         if (dev->busy) {
 679                 spin_unlock_irqrestore(&dev->lock, flags);
 680                 goto exit;
 681         }
 682         dev->busy = true;
 683
 684         spin_unlock_irqrestore(&dev->lock, flags);
 685
 686         tasklet_schedule(&dev->tasklet);
 687
 688 exit:
 689         return err;
 690 }
 691
 692 static int s5p_aes_crypt(struct ablkcipher_request *req, unsigned long mode)
 693 {
 694         struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
 695         struct s5p_aes_reqctx *reqctx = ablkcipher_request_ctx(req);
 696         struct s5p_aes_ctx *ctx = crypto_ablkcipher_ctx(tfm);
 697         struct s5p_aes_dev *dev = ctx->dev;
 698
 699         if (!IS_ALIGNED(req->nbytes, AES_BLOCK_SIZE)) {
 700                 dev_err(dev->dev, "request size is not exact amount of AES blocks\n");
 701                 return -EINVAL;
 702         }
 703
 704         reqctx->mode = mode;
 705
 706         return s5p_aes_handle_req(dev, req);
 707 }
 708
 709 static int s5p_aes_setkey(struct crypto_ablkcipher *cipher,
 710                           const uint8_t *key, unsigned int keylen)
 711 {
 712         struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
 713         struct s5p_aes_ctx *ctx = crypto_tfm_ctx(tfm);
 714
 715         if (keylen != AES_KEYSIZE_128 &&
 716             keylen != AES_KEYSIZE_192 &&
 717             keylen != AES_KEYSIZE_256)
 718                 return -EINVAL;
 719
 720         memcpy(ctx->aes_key, key, keylen);
 721         ctx->keylen = keylen;
 722
 723         return 0;
 724 }
 725
 726 static int s5p_aes_ecb_encrypt(struct ablkcipher_request *req)
 727 {
 728         return s5p_aes_crypt(req, 0);
 729 }
 730
 731 static int s5p_aes_ecb_decrypt(struct ablkcipher_request *req)
 732 {
 733         return s5p_aes_crypt(req, FLAGS_AES_DECRYPT);
 734 }
 735
 736 static int s5p_aes_cbc_encrypt(struct ablkcipher_request *req)
 737 {
 738         return s5p_aes_crypt(req, FLAGS_AES_CBC);
 739 }
 740
 741 static int s5p_aes_cbc_decrypt(struct ablkcipher_request *req)
 742 {
 743         return s5p_aes_crypt(req, FLAGS_AES_DECRYPT | FLAGS_AES_CBC);
 744 }
 745
 746 static int s5p_aes_cra_init(struct crypto_tfm *tfm)
 747 {
 748         struct s5p_aes_ctx *ctx = crypto_tfm_ctx(tfm);
 749
 750         ctx->dev = s5p_dev;
 751         tfm->crt_ablkcipher.reqsize = sizeof(struct s5p_aes_reqctx);
 752
 753         return 0;
 754 }
 755
 756 static struct crypto_alg algs[] = {
 757         {
 758                 .cra_name               = "ecb(aes)",
 759                 .cra_driver_name        = "ecb-aes-s5p",
 760                 .cra_priority           = 100,
 761                 .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER |
 762                                           CRYPTO_ALG_ASYNC |
 763                                           CRYPTO_ALG_KERN_DRIVER_ONLY,
 764                 .cra_blocksize          = AES_BLOCK_SIZE,
 765                 .cra_ctxsize            = sizeof(struct s5p_aes_ctx),
 766                 .cra_alignmask          = 0x0f,
 767                 .cra_type               = &crypto_ablkcipher_type,
 768                 .cra_module             = THIS_MODULE,
 769                 .cra_init               = s5p_aes_cra_init,
 770                 .cra_u.ablkcipher = {
 771                         .min_keysize    = AES_MIN_KEY_SIZE,
 772                         .max_keysize    = AES_MAX_KEY_SIZE,
 773                         .setkey         = s5p_aes_setkey,
 774                         .encrypt        = s5p_aes_ecb_encrypt,
 775                         .decrypt        = s5p_aes_ecb_decrypt,
 776                 }
 777         },
 778         {
 779                 .cra_name               = "cbc(aes)",
 780                 .cra_driver_name        = "cbc-aes-s5p",
 781                 .cra_priority           = 100,
 782                 .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER |
 783                                           CRYPTO_ALG_ASYNC |
 784                                           CRYPTO_ALG_KERN_DRIVER_ONLY,
 785                 .cra_blocksize          = AES_BLOCK_SIZE,
 786                 .cra_ctxsize            = sizeof(struct s5p_aes_ctx),
 787                 .cra_alignmask          = 0x0f,
 788                 .cra_type               = &crypto_ablkcipher_type,
 789                 .cra_module             = THIS_MODULE,
 790                 .cra_init               = s5p_aes_cra_init,
 791                 .cra_u.ablkcipher = {
 792                         .min_keysize    = AES_MIN_KEY_SIZE,
 793                         .max_keysize    = AES_MAX_KEY_SIZE,
 794                         .ivsize         = AES_BLOCK_SIZE,
 795                         .setkey         = s5p_aes_setkey,
 796                         .encrypt        = s5p_aes_cbc_encrypt,
 797                         .decrypt        = s5p_aes_cbc_decrypt,
 798                 }
 799         },
 800 };
 801
 802 static int s5p_aes_probe(struct platform_device *pdev)
 803 {
 804         struct device *dev = &pdev->dev;
 805         int i, j, err = -ENODEV;
 806         struct samsung_aes_variant *variant;
 807         struct s5p_aes_dev *pdata;
 808         struct resource *res;
 809
 810         if (s5p_dev)
 811                 return -EEXIST;
 812
 813         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 814         if (!pdata)
 815                 return -ENOMEM;
 816
 817         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 818         pdata->ioaddr = devm_ioremap_resource(&pdev->dev, res);
 819         if (IS_ERR(pdata->ioaddr))
 820                 return PTR_ERR(pdata->ioaddr);
 821
 822         variant = find_s5p_sss_version(pdev);
 823
 824         pdata->clk = devm_clk_get(dev, "secss");
 825         if (IS_ERR(pdata->clk)) {
 826                 dev_err(dev, "failed to find secss clock source\n");
 827                 return -ENOENT;
 828         }
 829
 830         err = clk_prepare_enable(pdata->clk);
 831         if (err < 0) {
 832                 dev_err(dev, "Enabling SSS clk failed, err %d\n", err);
 833                 return err;
 834         }
 835
 836         spin_lock_init(&pdata->lock);
 837
 838         pdata->aes_ioaddr = pdata->ioaddr + variant->aes_offset;
 839
 840         pdata->irq_fc = platform_get_irq(pdev, 0);
 841         if (pdata->irq_fc < 0) {
 842                 err = pdata->irq_fc;
 843                 dev_warn(dev, "feed control interrupt is not available.\n");
 844                 goto err_irq;
 845         }
 846         err = devm_request_irq(dev, pdata->irq_fc, s5p_aes_interrupt,
 847                                IRQF_SHARED, pdev->name, pdev);
 848         if (err < 0) {
 849                 dev_warn(dev, "feed control interrupt is not available.\n");
 850                 goto err_irq;
 851         }
 852
 853         pdata->busy = false;
 854         pdata->variant = variant;
 855         pdata->dev = dev;
 856         platform_set_drvdata(pdev, pdata);
 857         s5p_dev = pdata;
 858
 859         tasklet_init(&pdata->tasklet, s5p_tasklet_cb, (unsigned long)pdata);
 860         crypto_init_queue(&pdata->queue, CRYPTO_QUEUE_LEN);
 861
 862         for (i = 0; i < ARRAY_SIZE(algs); i++) {
 863                 err = crypto_register_alg(&algs[i]);
 864                 if (err)
 865                         goto err_algs;
 866         }
 867
 868         dev_info(dev, "s5p-sss driver registered\n");
 869
 870         return 0;
 871
 872 err_algs:
 873         dev_err(dev, "can't register '%s': %d\n", algs[i].cra_name, err);
 874
 875         for (j = 0; j < i; j++)
 876                 crypto_unregister_alg(&algs[j]);
 877
 878         tasklet_kill(&pdata->tasklet);
 879
 880 err_irq:
 881         clk_disable_unprepare(pdata->clk);
 882
 883         s5p_dev = NULL;
 884
 885         return err;
 886 }
 887
 888 static int s5p_aes_remove(struct platform_device *pdev)
 889 {
 890         struct s5p_aes_dev *pdata = platform_get_drvdata(pdev);
 891         int i;
 892
 893         if (!pdata)
 894                 return -ENODEV;
 895
 896         for (i = 0; i < ARRAY_SIZE(algs); i++)
 897                 crypto_unregister_alg(&algs[i]);
 898
 899         tasklet_kill(&pdata->tasklet);
 900
 901         clk_disable_unprepare(pdata->clk);
 902
 903         s5p_dev = NULL;
 904
 905         return 0;
 906 }
 907
 908 static struct platform_driver s5p_aes_crypto = {
 909         .probe  = s5p_aes_probe,
 910         .remove = s5p_aes_remove,
 911         .driver = {
 912                 .name   = "s5p-secss",
 913                 .of_match_table = s5p_sss_dt_match,
 914         },
 915 };
 916
 917 module_platform_driver(s5p_aes_crypto);
 918
 919 MODULE_DESCRIPTION("S5PV210 AES hw acceleration support.");
 920 MODULE_LICENSE("GPL v2");
 921 MODULE_AUTHOR("Vladimir Zapolskiy <vzapolskiy@gmail.com>");