drivers/crypto/omap-sham.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Cryptographic API.
   4  *
   5  * Support for OMAP SHA1/MD5 HW acceleration.
   6  *
   7  * Copyright (c) 2010 Nokia Corporation
   8  * Author: Dmitry Kasatkin <dmitry.kasatkin@nokia.com>
   9  * Copyright (c) 2011 Texas Instruments Incorporated
  10  *
  11  * Some ideas are from old omap-sha1-md5.c driver.
  12  */
  13
  14 #define pr_fmt(fmt) "%s: " fmt, __func__
  15
  16 #include <crypto/engine.h>
  17 #include <crypto/hmac.h>
  18 #include <crypto/internal/hash.h>
  19 #include <crypto/scatterwalk.h>
  20 #include <crypto/sha1.h>
  21 #include <crypto/sha2.h>
  22 #include <linux/err.h>
  23 #include <linux/device.h>
  24 #include <linux/dma-mapping.h>
  25 #include <linux/dmaengine.h>
  26 #include <linux/init.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/io.h>
  29 #include <linux/irq.h>
  30 #include <linux/kernel.h>
  31 #include <linux/module.h>
  32 #include <linux/of.h>
  33 #include <linux/of_address.h>
  34 #include <linux/of_irq.h>
  35 #include <linux/platform_device.h>
  36 #include <linux/pm_runtime.h>
  37 #include <linux/scatterlist.h>
  38 #include <linux/slab.h>
  39 #include <linux/string.h>
  40
  41 #define MD5_DIGEST_SIZE                 16
  42
  43 #define SHA_REG_IDIGEST(dd, x)          ((dd)->pdata->idigest_ofs + ((x)*0x04))
  44 #define SHA_REG_DIN(dd, x)              ((dd)->pdata->din_ofs + ((x) * 0x04))
  45 #define SHA_REG_DIGCNT(dd)              ((dd)->pdata->digcnt_ofs)
  46
  47 #define SHA_REG_ODIGEST(dd, x)          ((dd)->pdata->odigest_ofs + (x * 0x04))
  48
  49 #define SHA_REG_CTRL                    0x18
  50 #define SHA_REG_CTRL_LENGTH             (0xFFFFFFFF << 5)
  51 #define SHA_REG_CTRL_CLOSE_HASH         (1 << 4)
  52 #define SHA_REG_CTRL_ALGO_CONST         (1 << 3)
  53 #define SHA_REG_CTRL_ALGO               (1 << 2)
  54 #define SHA_REG_CTRL_INPUT_READY        (1 << 1)
  55 #define SHA_REG_CTRL_OUTPUT_READY       (1 << 0)
  56
  57 #define SHA_REG_REV(dd)                 ((dd)->pdata->rev_ofs)
  58
  59 #define SHA_REG_MASK(dd)                ((dd)->pdata->mask_ofs)
  60 #define SHA_REG_MASK_DMA_EN             (1 << 3)
  61 #define SHA_REG_MASK_IT_EN              (1 << 2)
  62 #define SHA_REG_MASK_SOFTRESET          (1 << 1)
  63 #define SHA_REG_AUTOIDLE                (1 << 0)
  64
  65 #define SHA_REG_SYSSTATUS(dd)           ((dd)->pdata->sysstatus_ofs)
  66 #define SHA_REG_SYSSTATUS_RESETDONE     (1 << 0)
  67
  68 #define SHA_REG_MODE(dd)                ((dd)->pdata->mode_ofs)
  69 #define SHA_REG_MODE_HMAC_OUTER_HASH    (1 << 7)
  70 #define SHA_REG_MODE_HMAC_KEY_PROC      (1 << 5)
  71 #define SHA_REG_MODE_CLOSE_HASH         (1 << 4)
  72 #define SHA_REG_MODE_ALGO_CONSTANT      (1 << 3)
  73
  74 #define SHA_REG_MODE_ALGO_MASK          (7 << 0)
  75 #define SHA_REG_MODE_ALGO_MD5_128       (0 << 1)
  76 #define SHA_REG_MODE_ALGO_SHA1_160      (1 << 1)
  77 #define SHA_REG_MODE_ALGO_SHA2_224      (2 << 1)
  78 #define SHA_REG_MODE_ALGO_SHA2_256      (3 << 1)
  79 #define SHA_REG_MODE_ALGO_SHA2_384      (1 << 0)
  80 #define SHA_REG_MODE_ALGO_SHA2_512      (3 << 0)
  81
  82 #define SHA_REG_LENGTH(dd)              ((dd)->pdata->length_ofs)
  83
  84 #define SHA_REG_IRQSTATUS               0x118
  85 #define SHA_REG_IRQSTATUS_CTX_RDY       (1 << 3)
  86 #define SHA_REG_IRQSTATUS_PARTHASH_RDY (1 << 2)
  87 #define SHA_REG_IRQSTATUS_INPUT_RDY     (1 << 1)
  88 #define SHA_REG_IRQSTATUS_OUTPUT_RDY    (1 << 0)
  89
  90 #define SHA_REG_IRQENA                  0x11C
  91 #define SHA_REG_IRQENA_CTX_RDY          (1 << 3)
  92 #define SHA_REG_IRQENA_PARTHASH_RDY     (1 << 2)
  93 #define SHA_REG_IRQENA_INPUT_RDY        (1 << 1)
  94 #define SHA_REG_IRQENA_OUTPUT_RDY       (1 << 0)
  95
  96 #define DEFAULT_TIMEOUT_INTERVAL        HZ
  97
  98 #define DEFAULT_AUTOSUSPEND_DELAY       1000
  99
 100 /* mostly device flags */
 101 #define FLAGS_FINAL             1
 102 #define FLAGS_DMA_ACTIVE        2
 103 #define FLAGS_OUTPUT_READY      3
 104 #define FLAGS_CPU               5
 105 #define FLAGS_DMA_READY         6
 106 #define FLAGS_AUTO_XOR          7
 107 #define FLAGS_BE32_SHA1         8
 108 #define FLAGS_SGS_COPIED        9
 109 #define FLAGS_SGS_ALLOCED       10
 110 #define FLAGS_HUGE              11
 111
 112 /* context flags */
 113 #define FLAGS_FINUP             16
 114
 115 #define FLAGS_MODE_SHIFT        18
 116 #define FLAGS_MODE_MASK         (SHA_REG_MODE_ALGO_MASK << FLAGS_MODE_SHIFT)
 117 #define FLAGS_MODE_MD5          (SHA_REG_MODE_ALGO_MD5_128 << FLAGS_MODE_SHIFT)
 118 #define FLAGS_MODE_SHA1         (SHA_REG_MODE_ALGO_SHA1_160 << FLAGS_MODE_SHIFT)
 119 #define FLAGS_MODE_SHA224       (SHA_REG_MODE_ALGO_SHA2_224 << FLAGS_MODE_SHIFT)
 120 #define FLAGS_MODE_SHA256       (SHA_REG_MODE_ALGO_SHA2_256 << FLAGS_MODE_SHIFT)
 121 #define FLAGS_MODE_SHA384       (SHA_REG_MODE_ALGO_SHA2_384 << FLAGS_MODE_SHIFT)
 122 #define FLAGS_MODE_SHA512       (SHA_REG_MODE_ALGO_SHA2_512 << FLAGS_MODE_SHIFT)
 123
 124 #define FLAGS_HMAC              21
 125 #define FLAGS_ERROR             22
 126
 127 #define OP_UPDATE               1
 128 #define OP_FINAL                2
 129
 130 #define OMAP_ALIGN_MASK         (sizeof(u32)-1)
 131 #define OMAP_ALIGNED            __attribute__((aligned(sizeof(u32))))
 132
 133 #define BUFLEN                  SHA512_BLOCK_SIZE
 134 #define OMAP_SHA_DMA_THRESHOLD  256
 135
 136 #define OMAP_SHA_MAX_DMA_LEN    (1024 * 2048)
 137
 138 struct omap_sham_dev;
 139
 140 struct omap_sham_reqctx {
 141         struct omap_sham_dev    *dd;
 142         unsigned long           flags;
 143         u8                      op;
 144
 145         u8                      digest[SHA512_DIGEST_SIZE] OMAP_ALIGNED;
 146         size_t                  digcnt;
 147         size_t                  bufcnt;
 148         size_t                  buflen;
 149
 150         /* walk state */
 151         struct scatterlist      *sg;
 152         struct scatterlist      sgl[2];
 153         int                     offset; /* offset in current sg */
 154         int                     sg_len;
 155         unsigned int            total;  /* total request */
 156
 157         u8                      buffer[] OMAP_ALIGNED;
 158 };
 159
 160 struct omap_sham_hmac_ctx {
 161         struct crypto_shash     *shash;
 162         u8                      ipad[SHA512_BLOCK_SIZE] OMAP_ALIGNED;
 163         u8                      opad[SHA512_BLOCK_SIZE] OMAP_ALIGNED;
 164 };
 165
 166 struct omap_sham_ctx {
 167         unsigned long           flags;
 168
 169         /* fallback stuff */
 170         struct crypto_shash     *fallback;
 171
 172         struct omap_sham_hmac_ctx base[];
 173 };
 174
 175 #define OMAP_SHAM_QUEUE_LENGTH  10
 176
 177 struct omap_sham_algs_info {
 178         struct ahash_engine_alg *algs_list;
 179         unsigned int            size;
 180         unsigned int            registered;
 181 };
 182
 183 struct omap_sham_pdata {
 184         struct omap_sham_algs_info      *algs_info;
 185         unsigned int    algs_info_size;
 186         unsigned long   flags;
 187         int             digest_size;
 188
 189         void            (*copy_hash)(struct ahash_request *req, int out);
 190         void            (*write_ctrl)(struct omap_sham_dev *dd, size_t length,
 191                                       int final, int dma);
 192         void            (*trigger)(struct omap_sham_dev *dd, size_t length);
 193         int             (*poll_irq)(struct omap_sham_dev *dd);
 194         irqreturn_t     (*intr_hdlr)(int irq, void *dev_id);
 195
 196         u32             odigest_ofs;
 197         u32             idigest_ofs;
 198         u32             din_ofs;
 199         u32             digcnt_ofs;
 200         u32             rev_ofs;
 201         u32             mask_ofs;
 202         u32             sysstatus_ofs;
 203         u32             mode_ofs;
 204         u32             length_ofs;
 205
 206         u32             major_mask;
 207         u32             major_shift;
 208         u32             minor_mask;
 209         u32             minor_shift;
 210 };
 211
 212 struct omap_sham_dev {
 213         struct list_head        list;
 214         unsigned long           phys_base;
 215         struct device           *dev;
 216         void __iomem            *io_base;
 217         int                     irq;
 218         int                     err;
 219         struct dma_chan         *dma_lch;
 220         struct tasklet_struct   done_task;
 221         u8                      polling_mode;
 222         u8                      xmit_buf[BUFLEN] OMAP_ALIGNED;
 223
 224         unsigned long           flags;
 225         int                     fallback_sz;
 226         struct crypto_queue     queue;
 227         struct ahash_request    *req;
 228         struct crypto_engine    *engine;
 229
 230         const struct omap_sham_pdata    *pdata;
 231 };
 232
 233 struct omap_sham_drv {
 234         struct list_head        dev_list;
 235         spinlock_t              lock;
 236         unsigned long           flags;
 237 };
 238
 239 static struct omap_sham_drv sham = {
 240         .dev_list = LIST_HEAD_INIT(sham.dev_list),
 241         .lock = __SPIN_LOCK_UNLOCKED(sham.lock),
 242 };
 243
 244 static int omap_sham_enqueue(struct ahash_request *req, unsigned int op);
 245 static void omap_sham_finish_req(struct ahash_request *req, int err);
 246
 247 static inline u32 omap_sham_read(struct omap_sham_dev *dd, u32 offset)
 248 {
 249         return __raw_readl(dd->io_base + offset);
 250 }
 251
 252 static inline void omap_sham_write(struct omap_sham_dev *dd,
 253                                         u32 offset, u32 value)
 254 {
 255         __raw_writel(value, dd->io_base + offset);
 256 }
 257
 258 static inline void omap_sham_write_mask(struct omap_sham_dev *dd, u32 address,
 259                                         u32 value, u32 mask)
 260 {
 261         u32 val;
 262
 263         val = omap_sham_read(dd, address);
 264         val &= ~mask;
 265         val |= value;
 266         omap_sham_write(dd, address, val);
 267 }
 268
 269 static inline int omap_sham_wait(struct omap_sham_dev *dd, u32 offset, u32 bit)
 270 {
 271         unsigned long timeout = jiffies + DEFAULT_TIMEOUT_INTERVAL;
 272
 273         while (!(omap_sham_read(dd, offset) & bit)) {
 274                 if (time_is_before_jiffies(timeout))
 275                         return -ETIMEDOUT;
 276         }
 277
 278         return 0;
 279 }
 280
 281 static void omap_sham_copy_hash_omap2(struct ahash_request *req, int out)
 282 {
 283         struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
 284         struct omap_sham_dev *dd = ctx->dd;
 285         u32 *hash = (u32 *)ctx->digest;
 286         int i;
 287
 288         for (i = 0; i < dd->pdata->digest_size / sizeof(u32); i++) {
 289                 if (out)
 290                         hash[i] = omap_sham_read(dd, SHA_REG_IDIGEST(dd, i));
 291                 else
 292                         omap_sham_write(dd, SHA_REG_IDIGEST(dd, i), hash[i]);
 293         }
 294 }
 295
 296 static void omap_sham_copy_hash_omap4(struct ahash_request *req, int out)
 297 {
 298         struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
 299         struct omap_sham_dev *dd = ctx->dd;
 300         int i;
 301
 302         if (ctx->flags & BIT(FLAGS_HMAC)) {
 303                 struct crypto_ahash *tfm = crypto_ahash_reqtfm(dd->req);
 304                 struct omap_sham_ctx *tctx = crypto_ahash_ctx(tfm);
 305                 struct omap_sham_hmac_ctx *bctx = tctx->base;
 306                 u32 *opad = (u32 *)bctx->opad;
 307
 308                 for (i = 0; i < dd->pdata->digest_size / sizeof(u32); i++) {
 309                         if (out)
 310                                 opad[i] = omap_sham_read(dd,
 311                                                 SHA_REG_ODIGEST(dd, i));
 312                         else
 313                                 omap_sham_write(dd, SHA_REG_ODIGEST(dd, i),
 314                                                 opad[i]);
 315                 }
 316         }
 317
 318         omap_sham_copy_hash_omap2(req, out);
 319 }
 320
 321 static void omap_sham_copy_ready_hash(struct ahash_request *req)
 322 {
 323         struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
 324         u32 *in = (u32 *)ctx->digest;
 325         u32 *hash = (u32 *)req->result;
 326         int i, d, big_endian = 0;
 327
 328         if (!hash)
 329                 return;
 330
 331         switch (ctx->flags & FLAGS_MODE_MASK) {
 332         case FLAGS_MODE_MD5:
 333                 d = MD5_DIGEST_SIZE / sizeof(u32);
 334                 break;
 335         case FLAGS_MODE_SHA1:
 336                 /* OMAP2 SHA1 is big endian */
 337                 if (test_bit(FLAGS_BE32_SHA1, &ctx->dd->flags))
 338                         big_endian = 1;
 339                 d = SHA1_DIGEST_SIZE / sizeof(u32);
 340                 break;
 341         case FLAGS_MODE_SHA224:
 342                 d = SHA224_DIGEST_SIZE / sizeof(u32);
 343                 break;
 344         case FLAGS_MODE_SHA256:
 345                 d = SHA256_DIGEST_SIZE / sizeof(u32);
 346                 break;
 347         case FLAGS_MODE_SHA384:
 348                 d = SHA384_DIGEST_SIZE / sizeof(u32);
 349                 break;
 350         case FLAGS_MODE_SHA512:
 351                 d = SHA512_DIGEST_SIZE / sizeof(u32);
 352                 break;
 353         default:
 354                 d = 0;
 355         }
 356
 357         if (big_endian)
 358                 for (i = 0; i < d; i++)
 359                         put_unaligned(be32_to_cpup((__be32 *)in + i), &hash[i]);
 360         else
 361                 for (i = 0; i < d; i++)
 362                         put_unaligned(le32_to_cpup((__le32 *)in + i), &hash[i]);
 363 }
 364
 365 static void omap_sham_write_ctrl_omap2(struct omap_sham_dev *dd, size_t length,
 366                                  int final, int dma)
 367 {
 368         struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
 369         u32 val = length << 5, mask;
 370
 371         if (likely(ctx->digcnt))
 372                 omap_sham_write(dd, SHA_REG_DIGCNT(dd), ctx->digcnt);
 373
 374         omap_sham_write_mask(dd, SHA_REG_MASK(dd),
 375                 SHA_REG_MASK_IT_EN | (dma ? SHA_REG_MASK_DMA_EN : 0),
 376                 SHA_REG_MASK_IT_EN | SHA_REG_MASK_DMA_EN);
 377         /*
 378          * Setting ALGO_CONST only for the first iteration
 379          * and CLOSE_HASH only for the last one.
 380          */
 381         if ((ctx->flags & FLAGS_MODE_MASK) == FLAGS_MODE_SHA1)
 382                 val |= SHA_REG_CTRL_ALGO;
 383         if (!ctx->digcnt)
 384                 val |= SHA_REG_CTRL_ALGO_CONST;
 385         if (final)
 386                 val |= SHA_REG_CTRL_CLOSE_HASH;
 387
 388         mask = SHA_REG_CTRL_ALGO_CONST | SHA_REG_CTRL_CLOSE_HASH |
 389                         SHA_REG_CTRL_ALGO | SHA_REG_CTRL_LENGTH;
 390
 391         omap_sham_write_mask(dd, SHA_REG_CTRL, val, mask);
 392 }
 393
 394 static void omap_sham_trigger_omap2(struct omap_sham_dev *dd, size_t length)
 395 {
 396 }
 397
 398 static int omap_sham_poll_irq_omap2(struct omap_sham_dev *dd)
 399 {
 400         return omap_sham_wait(dd, SHA_REG_CTRL, SHA_REG_CTRL_INPUT_READY);
 401 }
 402
 403 static int get_block_size(struct omap_sham_reqctx *ctx)
 404 {
 405         int d;
 406
 407         switch (ctx->flags & FLAGS_MODE_MASK) {
 408         case FLAGS_MODE_MD5:
 409         case FLAGS_MODE_SHA1:
 410                 d = SHA1_BLOCK_SIZE;
 411                 break;
 412         case FLAGS_MODE_SHA224:
 413         case FLAGS_MODE_SHA256:
 414                 d = SHA256_BLOCK_SIZE;
 415                 break;
 416         case FLAGS_MODE_SHA384:
 417         case FLAGS_MODE_SHA512:
 418                 d = SHA512_BLOCK_SIZE;
 419                 break;
 420         default:
 421                 d = 0;
 422         }
 423
 424         return d;
 425 }
 426
 427 static void omap_sham_write_n(struct omap_sham_dev *dd, u32 offset,
 428                                     u32 *value, int count)
 429 {
 430         for (; count--; value++, offset += 4)
 431                 omap_sham_write(dd, offset, *value);
 432 }
 433
 434 static void omap_sham_write_ctrl_omap4(struct omap_sham_dev *dd, size_t length,
 435                                  int final, int dma)
 436 {
 437         struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
 438         u32 val, mask;
 439
 440         if (likely(ctx->digcnt))
 441                 omap_sham_write(dd, SHA_REG_DIGCNT(dd), ctx->digcnt);
 442
 443         /*
 444          * Setting ALGO_CONST only for the first iteration and
 445          * CLOSE_HASH only for the last one. Note that flags mode bits
 446          * correspond to algorithm encoding in mode register.
 447          */
 448         val = (ctx->flags & FLAGS_MODE_MASK) >> (FLAGS_MODE_SHIFT);
 449         if (!ctx->digcnt) {
 450                 struct crypto_ahash *tfm = crypto_ahash_reqtfm(dd->req);
 451                 struct omap_sham_ctx *tctx = crypto_ahash_ctx(tfm);
 452                 struct omap_sham_hmac_ctx *bctx = tctx->base;
 453                 int bs, nr_dr;
 454
 455                 val |= SHA_REG_MODE_ALGO_CONSTANT;
 456
 457                 if (ctx->flags & BIT(FLAGS_HMAC)) {
 458                         bs = get_block_size(ctx);
 459                         nr_dr = bs / (2 * sizeof(u32));
 460                         val |= SHA_REG_MODE_HMAC_KEY_PROC;
 461                         omap_sham_write_n(dd, SHA_REG_ODIGEST(dd, 0),
 462                                           (u32 *)bctx->ipad, nr_dr);
 463                         omap_sham_write_n(dd, SHA_REG_IDIGEST(dd, 0),
 464                                           (u32 *)bctx->ipad + nr_dr, nr_dr);
 465                         ctx->digcnt += bs;
 466                 }
 467         }
 468
 469         if (final) {
 470                 val |= SHA_REG_MODE_CLOSE_HASH;
 471
 472                 if (ctx->flags & BIT(FLAGS_HMAC))
 473                         val |= SHA_REG_MODE_HMAC_OUTER_HASH;
 474         }
 475
 476         mask = SHA_REG_MODE_ALGO_CONSTANT | SHA_REG_MODE_CLOSE_HASH |
 477                SHA_REG_MODE_ALGO_MASK | SHA_REG_MODE_HMAC_OUTER_HASH |
 478                SHA_REG_MODE_HMAC_KEY_PROC;
 479
 480         dev_dbg(dd->dev, "ctrl: %08x, flags: %08lx\n", val, ctx->flags);
 481         omap_sham_write_mask(dd, SHA_REG_MODE(dd), val, mask);
 482         omap_sham_write(dd, SHA_REG_IRQENA, SHA_REG_IRQENA_OUTPUT_RDY);
 483         omap_sham_write_mask(dd, SHA_REG_MASK(dd),
 484                              SHA_REG_MASK_IT_EN |
 485                                      (dma ? SHA_REG_MASK_DMA_EN : 0),
 486                              SHA_REG_MASK_IT_EN | SHA_REG_MASK_DMA_EN);
 487 }
 488
 489 static void omap_sham_trigger_omap4(struct omap_sham_dev *dd, size_t length)
 490 {
 491         omap_sham_write(dd, SHA_REG_LENGTH(dd), length);
 492 }
 493
 494 static int omap_sham_poll_irq_omap4(struct omap_sham_dev *dd)
 495 {
 496         return omap_sham_wait(dd, SHA_REG_IRQSTATUS,
 497                               SHA_REG_IRQSTATUS_INPUT_RDY);
 498 }
 499
 500 static int omap_sham_xmit_cpu(struct omap_sham_dev *dd, size_t length,
 501                               int final)
 502 {
 503         struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
 504         int count, len32, bs32, offset = 0;
 505         const u32 *buffer;
 506         int mlen;
 507         struct sg_mapping_iter mi;
 508
 509         dev_dbg(dd->dev, "xmit_cpu: digcnt: %zd, length: %zd, final: %d\n",
 510                                                 ctx->digcnt, length, final);
 511
 512         dd->pdata->write_ctrl(dd, length, final, 0);
 513         dd->pdata->trigger(dd, length);
 514
 515         /* should be non-zero before next lines to disable clocks later */
 516         ctx->digcnt += length;
 517         ctx->total -= length;
 518
 519         if (final)
 520                 set_bit(FLAGS_FINAL, &dd->flags); /* catch last interrupt */
 521
 522         set_bit(FLAGS_CPU, &dd->flags);
 523
 524         len32 = DIV_ROUND_UP(length, sizeof(u32));
 525         bs32 = get_block_size(ctx) / sizeof(u32);
 526
 527         sg_miter_start(&mi, ctx->sg, ctx->sg_len,
 528                        SG_MITER_FROM_SG | SG_MITER_ATOMIC);
 529
 530         mlen = 0;
 531
 532         while (len32) {
 533                 if (dd->pdata->poll_irq(dd))
 534                         return -ETIMEDOUT;
 535
 536                 for (count = 0; count < min(len32, bs32); count++, offset++) {
 537                         if (!mlen) {
 538                                 sg_miter_next(&mi);
 539                                 mlen = mi.length;
 540                                 if (!mlen) {
 541                                         pr_err("sg miter failure.\n");
 542                                         return -EINVAL;
 543                                 }
 544                                 offset = 0;
 545                                 buffer = mi.addr;
 546                         }
 547                         omap_sham_write(dd, SHA_REG_DIN(dd, count),
 548                                         buffer[offset]);
 549                         mlen -= 4;
 550                 }
 551                 len32 -= min(len32, bs32);
 552         }
 553
 554         sg_miter_stop(&mi);
 555
 556         return -EINPROGRESS;
 557 }
 558
 559 static void omap_sham_dma_callback(void *param)
 560 {
 561         struct omap_sham_dev *dd = param;
 562
 563         set_bit(FLAGS_DMA_READY, &dd->flags);
 564         tasklet_schedule(&dd->done_task);
 565 }
 566
 567 static int omap_sham_xmit_dma(struct omap_sham_dev *dd, size_t length,
 568                               int final)
 569 {
 570         struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
 571         struct dma_async_tx_descriptor *tx;
 572         struct dma_slave_config cfg;
 573         int ret;
 574
 575         dev_dbg(dd->dev, "xmit_dma: digcnt: %zd, length: %zd, final: %d\n",
 576                                                 ctx->digcnt, length, final);
 577
 578         if (!dma_map_sg(dd->dev, ctx->sg, ctx->sg_len, DMA_TO_DEVICE)) {
 579                 dev_err(dd->dev, "dma_map_sg error\n");
 580                 return -EINVAL;
 581         }
 582
 583         memset(&cfg, 0, sizeof(cfg));
 584
 585         cfg.dst_addr = dd->phys_base + SHA_REG_DIN(dd, 0);
 586         cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 587         cfg.dst_maxburst = get_block_size(ctx) / DMA_SLAVE_BUSWIDTH_4_BYTES;
 588
 589         ret = dmaengine_slave_config(dd->dma_lch, &cfg);
 590         if (ret) {
 591                 pr_err("omap-sham: can't configure dmaengine slave: %d\n", ret);
 592                 return ret;
 593         }
 594
 595         tx = dmaengine_prep_slave_sg(dd->dma_lch, ctx->sg, ctx->sg_len,
 596                                      DMA_MEM_TO_DEV,
 597                                      DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 598
 599         if (!tx) {
 600                 dev_err(dd->dev, "prep_slave_sg failed\n");
 601                 return -EINVAL;
 602         }
 603
 604         tx->callback = omap_sham_dma_callback;
 605         tx->callback_param = dd;
 606
 607         dd->pdata->write_ctrl(dd, length, final, 1);
 608
 609         ctx->digcnt += length;
 610         ctx->total -= length;
 611
 612         if (final)
 613                 set_bit(FLAGS_FINAL, &dd->flags); /* catch last interrupt */
 614
 615         set_bit(FLAGS_DMA_ACTIVE, &dd->flags);
 616
 617         dmaengine_submit(tx);
 618         dma_async_issue_pending(dd->dma_lch);
 619
 620         dd->pdata->trigger(dd, length);
 621
 622         return -EINPROGRESS;
 623 }
 624
 625 static int omap_sham_copy_sg_lists(struct omap_sham_reqctx *ctx,
 626                                    struct scatterlist *sg, int bs, int new_len)
 627 {
 628         int n = sg_nents(sg);
 629         struct scatterlist *tmp;
 630         int offset = ctx->offset;
 631
 632         ctx->total = new_len;
 633
 634         if (ctx->bufcnt)
 635                 n++;
 636
 637         ctx->sg = kmalloc_array(n, sizeof(*sg), GFP_KERNEL);
 638         if (!ctx->sg)
 639                 return -ENOMEM;
 640
 641         sg_init_table(ctx->sg, n);
 642
 643         tmp = ctx->sg;
 644
 645         ctx->sg_len = 0;
 646
 647         if (ctx->bufcnt) {
 648                 sg_set_buf(tmp, ctx->dd->xmit_buf, ctx->bufcnt);
 649                 tmp = sg_next(tmp);
 650                 ctx->sg_len++;
 651                 new_len -= ctx->bufcnt;
 652         }
 653
 654         while (sg && new_len) {
 655                 int len = sg->length - offset;
 656
 657                 if (len <= 0) {
 658                         offset -= sg->length;
 659                         sg = sg_next(sg);
 660                         continue;
 661                 }
 662
 663                 if (new_len < len)
 664                         len = new_len;
 665
 666                 if (len > 0) {
 667                         new_len -= len;
 668                         sg_set_page(tmp, sg_page(sg), len, sg->offset + offset);
 669                         offset = 0;
 670                         ctx->offset = 0;
 671                         ctx->sg_len++;
 672                         if (new_len <= 0)
 673                                 break;
 674                         tmp = sg_next(tmp);
 675                 }
 676
 677                 sg = sg_next(sg);
 678         }
 679
 680         if (tmp)
 681                 sg_mark_end(tmp);
 682
 683         set_bit(FLAGS_SGS_ALLOCED, &ctx->dd->flags);
 684
 685         ctx->offset += new_len - ctx->bufcnt;
 686         ctx->bufcnt = 0;
 687
 688         return 0;
 689 }
 690
 691 static int omap_sham_copy_sgs(struct omap_sham_reqctx *ctx,
 692                               struct scatterlist *sg, int bs,
 693                               unsigned int new_len)
 694 {
 695         int pages;
 696         void *buf;
 697
 698         pages = get_order(new_len);
 699
 700         buf = (void *)__get_free_pages(GFP_ATOMIC, pages);
 701         if (!buf) {
 702                 pr_err("Couldn't allocate pages for unaligned cases.\n");
 703                 return -ENOMEM;
 704         }
 705
 706         if (ctx->bufcnt)
 707                 memcpy(buf, ctx->dd->xmit_buf, ctx->bufcnt);
 708
 709         scatterwalk_map_and_copy(buf + ctx->bufcnt, sg, ctx->offset,
 710                                  min(new_len, ctx->total) - ctx->bufcnt, 0);
 711         sg_init_table(ctx->sgl, 1);
 712         sg_set_buf(ctx->sgl, buf, new_len);
 713         ctx->sg = ctx->sgl;
 714         set_bit(FLAGS_SGS_COPIED, &ctx->dd->flags);
 715         ctx->sg_len = 1;
 716         ctx->offset += new_len - ctx->bufcnt;
 717         ctx->bufcnt = 0;
 718         ctx->total = new_len;
 719
 720         return 0;
 721 }
 722
 723 static int omap_sham_align_sgs(struct scatterlist *sg,
 724                                int nbytes, int bs, bool final,
 725                                struct omap_sham_reqctx *rctx)
 726 {
 727         int n = 0;
 728         bool aligned = true;
 729         bool list_ok = true;
 730         struct scatterlist *sg_tmp = sg;
 731         int new_len;
 732         int offset = rctx->offset;
 733         int bufcnt = rctx->bufcnt;
 734
 735         if (!sg || !sg->length || !nbytes) {
 736                 if (bufcnt) {
 737                         bufcnt = DIV_ROUND_UP(bufcnt, bs) * bs;
 738                         sg_init_table(rctx->sgl, 1);
 739                         sg_set_buf(rctx->sgl, rctx->dd->xmit_buf, bufcnt);
 740                         rctx->sg = rctx->sgl;
 741                         rctx->sg_len = 1;
 742                 }
 743
 744                 return 0;
 745         }
 746
 747         new_len = nbytes;
 748
 749         if (offset)
 750                 list_ok = false;
 751
 752         if (final)
 753                 new_len = DIV_ROUND_UP(new_len, bs) * bs;
 754         else
 755                 new_len = (new_len - 1) / bs * bs;
 756
 757         if (!new_len)
 758                 return 0;
 759
 760         if (nbytes != new_len)
 761                 list_ok = false;
 762
 763         while (nbytes > 0 && sg_tmp) {
 764                 n++;
 765
 766                 if (bufcnt) {
 767                         if (!IS_ALIGNED(bufcnt, bs)) {
 768                                 aligned = false;
 769                                 break;
 770                         }
 771                         nbytes -= bufcnt;
 772                         bufcnt = 0;
 773                         if (!nbytes)
 774                                 list_ok = false;
 775
 776                         continue;
 777                 }
 778
 779 #ifdef CONFIG_ZONE_DMA
 780                 if (page_zonenum(sg_page(sg_tmp)) != ZONE_DMA) {
 781                         aligned = false;
 782                         break;
 783                 }
 784 #endif
 785
 786                 if (offset < sg_tmp->length) {
 787                         if (!IS_ALIGNED(offset + sg_tmp->offset, 4)) {
 788                                 aligned = false;
 789                                 break;
 790                         }
 791
 792                         if (!IS_ALIGNED(sg_tmp->length - offset, bs)) {
 793                                 aligned = false;
 794                                 break;
 795                         }
 796                 }
 797
 798                 if (offset) {
 799                         offset -= sg_tmp->length;
 800                         if (offset < 0) {
 801                                 nbytes += offset;
 802                                 offset = 0;
 803                         }
 804                 } else {
 805                         nbytes -= sg_tmp->length;
 806                 }
 807
 808                 sg_tmp = sg_next(sg_tmp);
 809
 810                 if (nbytes < 0) {
 811                         list_ok = false;
 812                         break;
 813                 }
 814         }
 815
 816         if (new_len > OMAP_SHA_MAX_DMA_LEN) {
 817                 new_len = OMAP_SHA_MAX_DMA_LEN;
 818                 aligned = false;
 819         }
 820
 821         if (!aligned)
 822                 return omap_sham_copy_sgs(rctx, sg, bs, new_len);
 823         else if (!list_ok)
 824                 return omap_sham_copy_sg_lists(rctx, sg, bs, new_len);
 825
 826         rctx->total = new_len;
 827         rctx->offset += new_len;
 828         rctx->sg_len = n;
 829         if (rctx->bufcnt) {
 830                 sg_init_table(rctx->sgl, 2);
 831                 sg_set_buf(rctx->sgl, rctx->dd->xmit_buf, rctx->bufcnt);
 832                 sg_chain(rctx->sgl, 2, sg);
 833                 rctx->sg = rctx->sgl;
 834         } else {
 835                 rctx->sg = sg;
 836         }
 837
 838         return 0;
 839 }
 840
 841 static int omap_sham_prepare_request(struct crypto_engine *engine, void *areq)
 842 {
 843         struct ahash_request *req = container_of(areq, struct ahash_request,
 844                                                  base);
 845         struct omap_sham_reqctx *rctx = ahash_request_ctx(req);
 846         int bs;
 847         int ret;
 848         unsigned int nbytes;
 849         bool final = rctx->flags & BIT(FLAGS_FINUP);
 850         bool update = rctx->op == OP_UPDATE;
 851         int hash_later;
 852
 853         bs = get_block_size(rctx);
 854
 855         nbytes = rctx->bufcnt;
 856
 857         if (update)
 858                 nbytes += req->nbytes - rctx->offset;
 859
 860         dev_dbg(rctx->dd->dev,
 861                 "%s: nbytes=%d, bs=%d, total=%d, offset=%d, bufcnt=%zd\n",
 862                 __func__, nbytes, bs, rctx->total, rctx->offset,
 863                 rctx->bufcnt);
 864
 865         if (!nbytes)
 866                 return 0;
 867
 868         rctx->total = nbytes;
 869
 870         if (update && req->nbytes && (!IS_ALIGNED(rctx->bufcnt, bs))) {
 871                 int len = bs - rctx->bufcnt % bs;
 872
 873                 if (len > req->nbytes)
 874                         len = req->nbytes;
 875                 scatterwalk_map_and_copy(rctx->buffer + rctx->bufcnt, req->src,
 876                                          0, len, 0);
 877                 rctx->bufcnt += len;
 878                 rctx->offset = len;
 879         }
 880
 881         if (rctx->bufcnt)
 882                 memcpy(rctx->dd->xmit_buf, rctx->buffer, rctx->bufcnt);
 883
 884         ret = omap_sham_align_sgs(req->src, nbytes, bs, final, rctx);
 885         if (ret)
 886                 return ret;
 887
 888         hash_later = nbytes - rctx->total;
 889         if (hash_later < 0)
 890                 hash_later = 0;
 891
 892         if (hash_later && hash_later <= rctx->buflen) {
 893                 scatterwalk_map_and_copy(rctx->buffer,
 894                                          req->src,
 895                                          req->nbytes - hash_later,
 896                                          hash_later, 0);
 897
 898                 rctx->bufcnt = hash_later;
 899         } else {
 900                 rctx->bufcnt = 0;
 901         }
 902
 903         if (hash_later > rctx->buflen)
 904                 set_bit(FLAGS_HUGE, &rctx->dd->flags);
 905
 906         rctx->total = min(nbytes, rctx->total);
 907
 908         return 0;
 909 }
 910
 911 static int omap_sham_update_dma_stop(struct omap_sham_dev *dd)
 912 {
 913         struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
 914
 915         dma_unmap_sg(dd->dev, ctx->sg, ctx->sg_len, DMA_TO_DEVICE);
 916
 917         clear_bit(FLAGS_DMA_ACTIVE, &dd->flags);
 918
 919         return 0;
 920 }
 921
 922 static struct omap_sham_dev *omap_sham_find_dev(struct omap_sham_reqctx *ctx)
 923 {
 924         struct omap_sham_dev *dd;
 925
 926         if (ctx->dd)
 927                 return ctx->dd;
 928
 929         spin_lock_bh(&sham.lock);
 930         dd = list_first_entry(&sham.dev_list, struct omap_sham_dev, list);
 931         list_move_tail(&dd->list, &sham.dev_list);
 932         ctx->dd = dd;
 933         spin_unlock_bh(&sham.lock);
 934
 935         return dd;
 936 }
 937
 938 static int omap_sham_init(struct ahash_request *req)
 939 {
 940         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 941         struct omap_sham_ctx *tctx = crypto_ahash_ctx(tfm);
 942         struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
 943         struct omap_sham_dev *dd;
 944         int bs = 0;
 945
 946         ctx->dd = NULL;
 947
 948         dd = omap_sham_find_dev(ctx);
 949         if (!dd)
 950                 return -ENODEV;
 951
 952         ctx->flags = 0;
 953
 954         dev_dbg(dd->dev, "init: digest size: %d\n",
 955                 crypto_ahash_digestsize(tfm));
 956
 957         switch (crypto_ahash_digestsize(tfm)) {
 958         case MD5_DIGEST_SIZE:
 959                 ctx->flags |= FLAGS_MODE_MD5;
 960                 bs = SHA1_BLOCK_SIZE;
 961                 break;
 962         case SHA1_DIGEST_SIZE:
 963                 ctx->flags |= FLAGS_MODE_SHA1;
 964                 bs = SHA1_BLOCK_SIZE;
 965                 break;
 966         case SHA224_DIGEST_SIZE:
 967                 ctx->flags |= FLAGS_MODE_SHA224;
 968                 bs = SHA224_BLOCK_SIZE;
 969                 break;
 970         case SHA256_DIGEST_SIZE:
 971                 ctx->flags |= FLAGS_MODE_SHA256;
 972                 bs = SHA256_BLOCK_SIZE;
 973                 break;
 974         case SHA384_DIGEST_SIZE:
 975                 ctx->flags |= FLAGS_MODE_SHA384;
 976                 bs = SHA384_BLOCK_SIZE;
 977                 break;
 978         case SHA512_DIGEST_SIZE:
 979                 ctx->flags |= FLAGS_MODE_SHA512;
 980                 bs = SHA512_BLOCK_SIZE;
 981                 break;
 982         }
 983
 984         ctx->bufcnt = 0;
 985         ctx->digcnt = 0;
 986         ctx->total = 0;
 987         ctx->offset = 0;
 988         ctx->buflen = BUFLEN;
 989
 990         if (tctx->flags & BIT(FLAGS_HMAC)) {
 991                 if (!test_bit(FLAGS_AUTO_XOR, &dd->flags)) {
 992                         struct omap_sham_hmac_ctx *bctx = tctx->base;
 993
 994                         memcpy(ctx->buffer, bctx->ipad, bs);
 995                         ctx->bufcnt = bs;
 996                 }
 997
 998                 ctx->flags |= BIT(FLAGS_HMAC);
 999         }
1000
1001         return 0;
1002
1003 }
1004
1005 static int omap_sham_update_req(struct omap_sham_dev *dd)
1006 {
1007         struct ahash_request *req = dd->req;
1008         struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
1009         int err;
1010         bool final = (ctx->flags & BIT(FLAGS_FINUP)) &&
1011                 !(dd->flags & BIT(FLAGS_HUGE));
1012
1013         dev_dbg(dd->dev, "update_req: total: %u, digcnt: %zd, final: %d",
1014                 ctx->total, ctx->digcnt, final);
1015
1016         if (ctx->total < get_block_size(ctx) ||
1017             ctx->total < dd->fallback_sz)
1018                 ctx->flags |= BIT(FLAGS_CPU);
1019
1020         if (ctx->flags & BIT(FLAGS_CPU))
1021                 err = omap_sham_xmit_cpu(dd, ctx->total, final);
1022         else
1023                 err = omap_sham_xmit_dma(dd, ctx->total, final);
1024
1025         /* wait for dma completion before can take more data */
1026         dev_dbg(dd->dev, "update: err: %d, digcnt: %zd\n", err, ctx->digcnt);
1027
1028         return err;
1029 }
1030
1031 static int omap_sham_final_req(struct omap_sham_dev *dd)
1032 {
1033         struct ahash_request *req = dd->req;
1034         struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
1035         int err = 0, use_dma = 1;
1036
1037         if (dd->flags & BIT(FLAGS_HUGE))
1038                 return 0;
1039
1040         if ((ctx->total <= get_block_size(ctx)) || dd->polling_mode)
1041                 /*
1042                  * faster to handle last block with cpu or
1043                  * use cpu when dma is not present.
1044                  */
1045                 use_dma = 0;
1046
1047         if (use_dma)
1048                 err = omap_sham_xmit_dma(dd, ctx->total, 1);
1049         else
1050                 err = omap_sham_xmit_cpu(dd, ctx->total, 1);
1051
1052         ctx->bufcnt = 0;
1053
1054         dev_dbg(dd->dev, "final_req: err: %d\n", err);
1055
1056         return err;
1057 }
1058
1059 static int omap_sham_hash_one_req(struct crypto_engine *engine, void *areq)
1060 {
1061         struct ahash_request *req = container_of(areq, struct ahash_request,
1062                                                  base);
1063         struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
1064         struct omap_sham_dev *dd = ctx->dd;
1065         int err;
1066         bool final = (ctx->flags & BIT(FLAGS_FINUP)) &&
1067                         !(dd->flags & BIT(FLAGS_HUGE));
1068
1069         dev_dbg(dd->dev, "hash-one: op: %u, total: %u, digcnt: %zd, final: %d",
1070                 ctx->op, ctx->total, ctx->digcnt, final);
1071
1072         err = omap_sham_prepare_request(engine, areq);
1073         if (err)
1074                 return err;
1075
1076         err = pm_runtime_resume_and_get(dd->dev);
1077         if (err < 0) {
1078                 dev_err(dd->dev, "failed to get sync: %d\n", err);
1079                 return err;
1080         }
1081
1082         dd->err = 0;
1083         dd->req = req;
1084
1085         if (ctx->digcnt)
1086                 dd->pdata->copy_hash(req, 0);
1087
1088         if (ctx->op == OP_UPDATE)
1089                 err = omap_sham_update_req(dd);
1090         else if (ctx->op == OP_FINAL)
1091                 err = omap_sham_final_req(dd);
1092
1093         if (err != -EINPROGRESS)
1094                 omap_sham_finish_req(req, err);
1095
1096         return 0;
1097 }
1098
1099 static int omap_sham_finish_hmac(struct ahash_request *req)
1100 {
1101         struct omap_sham_ctx *tctx = crypto_tfm_ctx(req->base.tfm);
1102         struct omap_sham_hmac_ctx *bctx = tctx->base;
1103         int bs = crypto_shash_blocksize(bctx->shash);
1104         int ds = crypto_shash_digestsize(bctx->shash);
1105         SHASH_DESC_ON_STACK(shash, bctx->shash);
1106
1107         shash->tfm = bctx->shash;
1108
1109         return crypto_shash_init(shash) ?:
1110                crypto_shash_update(shash, bctx->opad, bs) ?:
1111                crypto_shash_finup(shash, req->result, ds, req->result);
1112 }
1113
1114 static int omap_sham_finish(struct ahash_request *req)
1115 {
1116         struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
1117         struct omap_sham_dev *dd = ctx->dd;
1118         int err = 0;
1119
1120         if (ctx->digcnt) {
1121                 omap_sham_copy_ready_hash(req);
1122                 if ((ctx->flags & BIT(FLAGS_HMAC)) &&
1123                                 !test_bit(FLAGS_AUTO_XOR, &dd->flags))
1124                         err = omap_sham_finish_hmac(req);
1125         }
1126
1127         dev_dbg(dd->dev, "digcnt: %zd, bufcnt: %zd\n", ctx->digcnt, ctx->bufcnt);
1128
1129         return err;
1130 }
1131
1132 static void omap_sham_finish_req(struct ahash_request *req, int err)
1133 {
1134         struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
1135         struct omap_sham_dev *dd = ctx->dd;
1136
1137         if (test_bit(FLAGS_SGS_COPIED, &dd->flags))
1138                 free_pages((unsigned long)sg_virt(ctx->sg),
1139                            get_order(ctx->sg->length));
1140
1141         if (test_bit(FLAGS_SGS_ALLOCED, &dd->flags))
1142                 kfree(ctx->sg);
1143
1144         ctx->sg = NULL;
1145
1146         dd->flags &= ~(BIT(FLAGS_SGS_ALLOCED) | BIT(FLAGS_SGS_COPIED) |
1147                        BIT(FLAGS_CPU) | BIT(FLAGS_DMA_READY) |
1148                        BIT(FLAGS_OUTPUT_READY));
1149
1150         if (!err)
1151                 dd->pdata->copy_hash(req, 1);
1152
1153         if (dd->flags & BIT(FLAGS_HUGE)) {
1154                 /* Re-enqueue the request */
1155                 omap_sham_enqueue(req, ctx->op);
1156                 return;
1157         }
1158
1159         if (!err) {
1160                 if (test_bit(FLAGS_FINAL, &dd->flags))
1161                         err = omap_sham_finish(req);
1162         } else {
1163                 ctx->flags |= BIT(FLAGS_ERROR);
1164         }
1165
1166         /* atomic operation is not needed here */
1167         dd->flags &= ~(BIT(FLAGS_FINAL) | BIT(FLAGS_CPU) |
1168                         BIT(FLAGS_DMA_READY) | BIT(FLAGS_OUTPUT_READY));
1169
1170         pm_runtime_mark_last_busy(dd->dev);
1171         pm_runtime_put_autosuspend(dd->dev);
1172
1173         ctx->offset = 0;
1174
1175         crypto_finalize_hash_request(dd->engine, req, err);
1176 }
1177
1178 static int omap_sham_handle_queue(struct omap_sham_dev *dd,
1179                                   struct ahash_request *req)
1180 {
1181         return crypto_transfer_hash_request_to_engine(dd->engine, req);
1182 }
1183
1184 static int omap_sham_enqueue(struct ahash_request *req, unsigned int op)
1185 {
1186         struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
1187         struct omap_sham_dev *dd = ctx->dd;
1188
1189         ctx->op = op;
1190
1191         return omap_sham_handle_queue(dd, req);
1192 }
1193
1194 static int omap_sham_update(struct ahash_request *req)
1195 {
1196         struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
1197         struct omap_sham_dev *dd = omap_sham_find_dev(ctx);
1198
1199         if (!req->nbytes)
1200                 return 0;
1201
1202         if (ctx->bufcnt + req->nbytes <= ctx->buflen) {
1203                 scatterwalk_map_and_copy(ctx->buffer + ctx->bufcnt, req->src,
1204                                          0, req->nbytes, 0);
1205                 ctx->bufcnt += req->nbytes;
1206                 return 0;
1207         }
1208
1209         if (dd->polling_mode)
1210                 ctx->flags |= BIT(FLAGS_CPU);
1211
1212         return omap_sham_enqueue(req, OP_UPDATE);
1213 }
1214
1215 static int omap_sham_final_shash(struct ahash_request *req)
1216 {
1217         struct omap_sham_ctx *tctx = crypto_tfm_ctx(req->base.tfm);
1218         struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
1219         int offset = 0;
1220
1221         /*
1222          * If we are running HMAC on limited hardware support, skip
1223          * the ipad in the beginning of the buffer if we are going for
1224          * software fallback algorithm.
1225          */
1226         if (test_bit(FLAGS_HMAC, &ctx->flags) &&
1227             !test_bit(FLAGS_AUTO_XOR, &ctx->dd->flags))
1228                 offset = get_block_size(ctx);
1229
1230         return crypto_shash_tfm_digest(tctx->fallback, ctx->buffer + offset,
1231                                        ctx->bufcnt - offset, req->result);
1232 }
1233
1234 static int omap_sham_final(struct ahash_request *req)
1235 {
1236         struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
1237
1238         ctx->flags |= BIT(FLAGS_FINUP);
1239
1240         if (ctx->flags & BIT(FLAGS_ERROR))
1241                 return 0; /* uncompleted hash is not needed */
1242
1243         /*
1244          * OMAP HW accel works only with buffers >= 9.
1245          * HMAC is always >= 9 because ipad == block size.
1246          * If buffersize is less than fallback_sz, we use fallback
1247          * SW encoding, as using DMA + HW in this case doesn't provide
1248          * any benefit.
1249          */
1250         if (!ctx->digcnt && ctx->bufcnt < ctx->dd->fallback_sz)
1251                 return omap_sham_final_shash(req);
1252         else if (ctx->bufcnt)
1253                 return omap_sham_enqueue(req, OP_FINAL);
1254
1255         /* copy ready hash (+ finalize hmac) */
1256         return omap_sham_finish(req);
1257 }
1258
1259 static int omap_sham_finup(struct ahash_request *req)
1260 {
1261         struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
1262         int err1, err2;
1263
1264         ctx->flags |= BIT(FLAGS_FINUP);
1265
1266         err1 = omap_sham_update(req);
1267         if (err1 == -EINPROGRESS || err1 == -EBUSY)
1268                 return err1;
1269         /*
1270          * final() has to be always called to cleanup resources
1271          * even if udpate() failed, except EINPROGRESS
1272          */
1273         err2 = omap_sham_final(req);
1274
1275         return err1 ?: err2;
1276 }
1277
1278 static int omap_sham_digest(struct ahash_request *req)
1279 {
1280         return omap_sham_init(req) ?: omap_sham_finup(req);
1281 }
1282
1283 static int omap_sham_setkey(struct crypto_ahash *tfm, const u8 *key,
1284                       unsigned int keylen)
1285 {
1286         struct omap_sham_ctx *tctx = crypto_ahash_ctx(tfm);
1287         struct omap_sham_hmac_ctx *bctx = tctx->base;
1288         int bs = crypto_shash_blocksize(bctx->shash);
1289         int ds = crypto_shash_digestsize(bctx->shash);
1290         int err, i;
1291
1292         err = crypto_shash_setkey(tctx->fallback, key, keylen);
1293         if (err)
1294                 return err;
1295
1296         if (keylen > bs) {
1297                 err = crypto_shash_tfm_digest(bctx->shash, key, keylen,
1298                                               bctx->ipad);
1299                 if (err)
1300                         return err;
1301                 keylen = ds;
1302         } else {
1303                 memcpy(bctx->ipad, key, keylen);
1304         }
1305
1306         memset(bctx->ipad + keylen, 0, bs - keylen);
1307
1308         if (!test_bit(FLAGS_AUTO_XOR, &sham.flags)) {
1309                 memcpy(bctx->opad, bctx->ipad, bs);
1310
1311                 for (i = 0; i < bs; i++) {
1312                         bctx->ipad[i] ^= HMAC_IPAD_VALUE;
1313                         bctx->opad[i] ^= HMAC_OPAD_VALUE;
1314                 }
1315         }
1316
1317         return err;
1318 }
1319
1320 static int omap_sham_cra_init_alg(struct crypto_tfm *tfm, const char *alg_base)
1321 {
1322         struct omap_sham_ctx *tctx = crypto_tfm_ctx(tfm);
1323         const char *alg_name = crypto_tfm_alg_name(tfm);
1324
1325         /* Allocate a fallback and abort if it failed. */
1326         tctx->fallback = crypto_alloc_shash(alg_name, 0,
1327                                             CRYPTO_ALG_NEED_FALLBACK);
1328         if (IS_ERR(tctx->fallback)) {
1329                 pr_err("omap-sham: fallback driver '%s' "
1330                                 "could not be loaded.\n", alg_name);
1331                 return PTR_ERR(tctx->fallback);
1332         }
1333
1334         crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
1335                                  sizeof(struct omap_sham_reqctx) + BUFLEN);
1336
1337         if (alg_base) {
1338                 struct omap_sham_hmac_ctx *bctx = tctx->base;
1339                 tctx->flags |= BIT(FLAGS_HMAC);
1340                 bctx->shash = crypto_alloc_shash(alg_base, 0,
1341                                                 CRYPTO_ALG_NEED_FALLBACK);
1342                 if (IS_ERR(bctx->shash)) {
1343                         pr_err("omap-sham: base driver '%s' "
1344                                         "could not be loaded.\n", alg_base);
1345                         crypto_free_shash(tctx->fallback);
1346                         return PTR_ERR(bctx->shash);
1347                 }
1348
1349         }
1350
1351         return 0;
1352 }
1353
1354 static int omap_sham_cra_init(struct crypto_tfm *tfm)
1355 {
1356         return omap_sham_cra_init_alg(tfm, NULL);
1357 }
1358
1359 static int omap_sham_cra_sha1_init(struct crypto_tfm *tfm)
1360 {
1361         return omap_sham_cra_init_alg(tfm, "sha1");
1362 }
1363
1364 static int omap_sham_cra_sha224_init(struct crypto_tfm *tfm)
1365 {
1366         return omap_sham_cra_init_alg(tfm, "sha224");
1367 }
1368
1369 static int omap_sham_cra_sha256_init(struct crypto_tfm *tfm)
1370 {
1371         return omap_sham_cra_init_alg(tfm, "sha256");
1372 }
1373
1374 static int omap_sham_cra_md5_init(struct crypto_tfm *tfm)
1375 {
1376         return omap_sham_cra_init_alg(tfm, "md5");
1377 }
1378
1379 static int omap_sham_cra_sha384_init(struct crypto_tfm *tfm)
1380 {
1381         return omap_sham_cra_init_alg(tfm, "sha384");
1382 }
1383
1384 static int omap_sham_cra_sha512_init(struct crypto_tfm *tfm)
1385 {
1386         return omap_sham_cra_init_alg(tfm, "sha512");
1387 }
1388
1389 static void omap_sham_cra_exit(struct crypto_tfm *tfm)
1390 {
1391         struct omap_sham_ctx *tctx = crypto_tfm_ctx(tfm);
1392
1393         crypto_free_shash(tctx->fallback);
1394         tctx->fallback = NULL;
1395
1396         if (tctx->flags & BIT(FLAGS_HMAC)) {
1397                 struct omap_sham_hmac_ctx *bctx = tctx->base;
1398                 crypto_free_shash(bctx->shash);
1399         }
1400 }
1401
1402 static int omap_sham_export(struct ahash_request *req, void *out)
1403 {
1404         struct omap_sham_reqctx *rctx = ahash_request_ctx(req);
1405
1406         memcpy(out, rctx, sizeof(*rctx) + rctx->bufcnt);
1407
1408         return 0;
1409 }
1410
1411 static int omap_sham_import(struct ahash_request *req, const void *in)
1412 {
1413         struct omap_sham_reqctx *rctx = ahash_request_ctx(req);
1414         const struct omap_sham_reqctx *ctx_in = in;
1415
1416         memcpy(rctx, in, sizeof(*rctx) + ctx_in->bufcnt);
1417
1418         return 0;
1419 }
1420
1421 static struct ahash_engine_alg algs_sha1_md5[] = {
1422 {
1423         .base.init              = omap_sham_init,
1424         .base.update            = omap_sham_update,
1425         .base.final             = omap_sham_final,
1426         .base.finup             = omap_sham_finup,
1427         .base.digest            = omap_sham_digest,
1428         .base.halg.digestsize   = SHA1_DIGEST_SIZE,
1429         .base.halg.base = {
1430                 .cra_name               = "sha1",
1431                 .cra_driver_name        = "omap-sha1",
1432                 .cra_priority           = 400,
1433                 .cra_flags              = CRYPTO_ALG_KERN_DRIVER_ONLY |
1434                                                 CRYPTO_ALG_ASYNC |
1435                                                 CRYPTO_ALG_NEED_FALLBACK,
1436                 .cra_blocksize          = SHA1_BLOCK_SIZE,
1437                 .cra_ctxsize            = sizeof(struct omap_sham_ctx),
1438                 .cra_module             = THIS_MODULE,
1439                 .cra_init               = omap_sham_cra_init,
1440                 .cra_exit               = omap_sham_cra_exit,
1441         },
1442         .op.do_one_request = omap_sham_hash_one_req,
1443 },
1444 {
1445         .base.init              = omap_sham_init,
1446         .base.update            = omap_sham_update,
1447         .base.final             = omap_sham_final,
1448         .base.finup             = omap_sham_finup,
1449         .base.digest            = omap_sham_digest,
1450         .base.halg.digestsize   = MD5_DIGEST_SIZE,
1451         .base.halg.base = {
1452                 .cra_name               = "md5",
1453                 .cra_driver_name        = "omap-md5",
1454                 .cra_priority           = 400,
1455                 .cra_flags              = CRYPTO_ALG_KERN_DRIVER_ONLY |
1456                                                 CRYPTO_ALG_ASYNC |
1457                                                 CRYPTO_ALG_NEED_FALLBACK,
1458                 .cra_blocksize          = SHA1_BLOCK_SIZE,
1459                 .cra_ctxsize            = sizeof(struct omap_sham_ctx),
1460                 .cra_module             = THIS_MODULE,
1461                 .cra_init               = omap_sham_cra_init,
1462                 .cra_exit               = omap_sham_cra_exit,
1463         },
1464         .op.do_one_request = omap_sham_hash_one_req,
1465 },
1466 {
1467         .base.init              = omap_sham_init,
1468         .base.update            = omap_sham_update,
1469         .base.final             = omap_sham_final,
1470         .base.finup             = omap_sham_finup,
1471         .base.digest            = omap_sham_digest,
1472         .base.setkey            = omap_sham_setkey,
1473         .base.halg.digestsize   = SHA1_DIGEST_SIZE,
1474         .base.halg.base = {
1475                 .cra_name               = "hmac(sha1)",
1476                 .cra_driver_name        = "omap-hmac-sha1",
1477                 .cra_priority           = 400,
1478                 .cra_flags              = CRYPTO_ALG_KERN_DRIVER_ONLY |
1479                                                 CRYPTO_ALG_ASYNC |
1480                                                 CRYPTO_ALG_NEED_FALLBACK,
1481                 .cra_blocksize          = SHA1_BLOCK_SIZE,
1482                 .cra_ctxsize            = sizeof(struct omap_sham_ctx) +
1483                                         sizeof(struct omap_sham_hmac_ctx),
1484                 .cra_module             = THIS_MODULE,
1485                 .cra_init               = omap_sham_cra_sha1_init,
1486                 .cra_exit               = omap_sham_cra_exit,
1487         },
1488         .op.do_one_request = omap_sham_hash_one_req,
1489 },
1490 {
1491         .base.init              = omap_sham_init,
1492         .base.update            = omap_sham_update,
1493         .base.final             = omap_sham_final,
1494         .base.finup             = omap_sham_finup,
1495         .base.digest            = omap_sham_digest,
1496         .base.setkey            = omap_sham_setkey,
1497         .base.halg.digestsize   = MD5_DIGEST_SIZE,
1498         .base.halg.base = {
1499                 .cra_name               = "hmac(md5)",
1500                 .cra_driver_name        = "omap-hmac-md5",
1501                 .cra_priority           = 400,
1502                 .cra_flags              = CRYPTO_ALG_KERN_DRIVER_ONLY |
1503                                                 CRYPTO_ALG_ASYNC |
1504                                                 CRYPTO_ALG_NEED_FALLBACK,
1505                 .cra_blocksize          = SHA1_BLOCK_SIZE,
1506                 .cra_ctxsize            = sizeof(struct omap_sham_ctx) +
1507                                         sizeof(struct omap_sham_hmac_ctx),
1508                 .cra_module             = THIS_MODULE,
1509                 .cra_init               = omap_sham_cra_md5_init,
1510                 .cra_exit               = omap_sham_cra_exit,
1511         },
1512         .op.do_one_request = omap_sham_hash_one_req,
1513 }
1514 };
1515
1516 /* OMAP4 has some algs in addition to what OMAP2 has */
1517 static struct ahash_engine_alg algs_sha224_sha256[] = {
1518 {
1519         .base.init              = omap_sham_init,
1520         .base.update            = omap_sham_update,
1521         .base.final             = omap_sham_final,
1522         .base.finup             = omap_sham_finup,
1523         .base.digest            = omap_sham_digest,
1524         .base.halg.digestsize   = SHA224_DIGEST_SIZE,
1525         .base.halg.base = {
1526                 .cra_name               = "sha224",
1527                 .cra_driver_name        = "omap-sha224",
1528                 .cra_priority           = 400,
1529                 .cra_flags              = CRYPTO_ALG_KERN_DRIVER_ONLY |
1530                                                 CRYPTO_ALG_ASYNC |
1531                                                 CRYPTO_ALG_NEED_FALLBACK,
1532                 .cra_blocksize          = SHA224_BLOCK_SIZE,
1533                 .cra_ctxsize            = sizeof(struct omap_sham_ctx),
1534                 .cra_module             = THIS_MODULE,
1535                 .cra_init               = omap_sham_cra_init,
1536                 .cra_exit               = omap_sham_cra_exit,
1537         },
1538         .op.do_one_request = omap_sham_hash_one_req,
1539 },
1540 {
1541         .base.init              = omap_sham_init,
1542         .base.update            = omap_sham_update,
1543         .base.final             = omap_sham_final,
1544         .base.finup             = omap_sham_finup,
1545         .base.digest            = omap_sham_digest,
1546         .base.halg.digestsize   = SHA256_DIGEST_SIZE,
1547         .base.halg.base = {
1548                 .cra_name               = "sha256",
1549                 .cra_driver_name        = "omap-sha256",
1550                 .cra_priority           = 400,
1551                 .cra_flags              = CRYPTO_ALG_KERN_DRIVER_ONLY |
1552                                                 CRYPTO_ALG_ASYNC |
1553                                                 CRYPTO_ALG_NEED_FALLBACK,
1554                 .cra_blocksize          = SHA256_BLOCK_SIZE,
1555                 .cra_ctxsize            = sizeof(struct omap_sham_ctx),
1556                 .cra_module             = THIS_MODULE,
1557                 .cra_init               = omap_sham_cra_init,
1558                 .cra_exit               = omap_sham_cra_exit,
1559         },
1560         .op.do_one_request = omap_sham_hash_one_req,
1561 },
1562 {
1563         .base.init              = omap_sham_init,
1564         .base.update            = omap_sham_update,
1565         .base.final             = omap_sham_final,
1566         .base.finup             = omap_sham_finup,
1567         .base.digest            = omap_sham_digest,
1568         .base.setkey            = omap_sham_setkey,
1569         .base.halg.digestsize   = SHA224_DIGEST_SIZE,
1570         .base.halg.base = {
1571                 .cra_name               = "hmac(sha224)",
1572                 .cra_driver_name        = "omap-hmac-sha224",
1573                 .cra_priority           = 400,
1574                 .cra_flags              = CRYPTO_ALG_KERN_DRIVER_ONLY |
1575                                                 CRYPTO_ALG_ASYNC |
1576                                                 CRYPTO_ALG_NEED_FALLBACK,
1577                 .cra_blocksize          = SHA224_BLOCK_SIZE,
1578                 .cra_ctxsize            = sizeof(struct omap_sham_ctx) +
1579                                         sizeof(struct omap_sham_hmac_ctx),
1580                 .cra_module             = THIS_MODULE,
1581                 .cra_init               = omap_sham_cra_sha224_init,
1582                 .cra_exit               = omap_sham_cra_exit,
1583         },
1584         .op.do_one_request = omap_sham_hash_one_req,
1585 },
1586 {
1587         .base.init              = omap_sham_init,
1588         .base.update            = omap_sham_update,
1589         .base.final             = omap_sham_final,
1590         .base.finup             = omap_sham_finup,
1591         .base.digest            = omap_sham_digest,
1592         .base.setkey            = omap_sham_setkey,
1593         .base.halg.digestsize   = SHA256_DIGEST_SIZE,
1594         .base.halg.base = {
1595                 .cra_name               = "hmac(sha256)",
1596                 .cra_driver_name        = "omap-hmac-sha256",
1597                 .cra_priority           = 400,
1598                 .cra_flags              = CRYPTO_ALG_KERN_DRIVER_ONLY |
1599                                                 CRYPTO_ALG_ASYNC |
1600                                                 CRYPTO_ALG_NEED_FALLBACK,
1601                 .cra_blocksize          = SHA256_BLOCK_SIZE,
1602                 .cra_ctxsize            = sizeof(struct omap_sham_ctx) +
1603                                         sizeof(struct omap_sham_hmac_ctx),
1604                 .cra_module             = THIS_MODULE,
1605                 .cra_init               = omap_sham_cra_sha256_init,
1606                 .cra_exit               = omap_sham_cra_exit,
1607         },
1608         .op.do_one_request = omap_sham_hash_one_req,
1609 },
1610 };
1611
1612 static struct ahash_engine_alg algs_sha384_sha512[] = {
1613 {
1614         .base.init              = omap_sham_init,
1615         .base.update            = omap_sham_update,
1616         .base.final             = omap_sham_final,
1617         .base.finup             = omap_sham_finup,
1618         .base.digest            = omap_sham_digest,
1619         .base.halg.digestsize   = SHA384_DIGEST_SIZE,
1620         .base.halg.base = {
1621                 .cra_name               = "sha384",
1622                 .cra_driver_name        = "omap-sha384",
1623                 .cra_priority           = 400,
1624                 .cra_flags              = CRYPTO_ALG_KERN_DRIVER_ONLY |
1625                                                 CRYPTO_ALG_ASYNC |
1626                                                 CRYPTO_ALG_NEED_FALLBACK,
1627                 .cra_blocksize          = SHA384_BLOCK_SIZE,
1628                 .cra_ctxsize            = sizeof(struct omap_sham_ctx),
1629                 .cra_module             = THIS_MODULE,
1630                 .cra_init               = omap_sham_cra_init,
1631                 .cra_exit               = omap_sham_cra_exit,
1632         },
1633         .op.do_one_request = omap_sham_hash_one_req,
1634 },
1635 {
1636         .base.init              = omap_sham_init,
1637         .base.update            = omap_sham_update,
1638         .base.final             = omap_sham_final,
1639         .base.finup             = omap_sham_finup,
1640         .base.digest            = omap_sham_digest,
1641         .base.halg.digestsize   = SHA512_DIGEST_SIZE,
1642         .base.halg.base = {
1643                 .cra_name               = "sha512",
1644                 .cra_driver_name        = "omap-sha512",
1645                 .cra_priority           = 400,
1646                 .cra_flags              = CRYPTO_ALG_KERN_DRIVER_ONLY |
1647                                                 CRYPTO_ALG_ASYNC |
1648                                                 CRYPTO_ALG_NEED_FALLBACK,
1649                 .cra_blocksize          = SHA512_BLOCK_SIZE,
1650                 .cra_ctxsize            = sizeof(struct omap_sham_ctx),
1651                 .cra_module             = THIS_MODULE,
1652                 .cra_init               = omap_sham_cra_init,
1653                 .cra_exit               = omap_sham_cra_exit,
1654         },
1655         .op.do_one_request = omap_sham_hash_one_req,
1656 },
1657 {
1658         .base.init              = omap_sham_init,
1659         .base.update            = omap_sham_update,
1660         .base.final             = omap_sham_final,
1661         .base.finup             = omap_sham_finup,
1662         .base.digest            = omap_sham_digest,
1663         .base.setkey            = omap_sham_setkey,
1664         .base.halg.digestsize   = SHA384_DIGEST_SIZE,
1665         .base.halg.base = {
1666                 .cra_name               = "hmac(sha384)",
1667                 .cra_driver_name        = "omap-hmac-sha384",
1668                 .cra_priority           = 400,
1669                 .cra_flags              = CRYPTO_ALG_KERN_DRIVER_ONLY |
1670                                                 CRYPTO_ALG_ASYNC |
1671                                                 CRYPTO_ALG_NEED_FALLBACK,
1672                 .cra_blocksize          = SHA384_BLOCK_SIZE,
1673                 .cra_ctxsize            = sizeof(struct omap_sham_ctx) +
1674                                         sizeof(struct omap_sham_hmac_ctx),
1675                 .cra_module             = THIS_MODULE,
1676                 .cra_init               = omap_sham_cra_sha384_init,
1677                 .cra_exit               = omap_sham_cra_exit,
1678         },
1679         .op.do_one_request = omap_sham_hash_one_req,
1680 },
1681 {
1682         .base.init              = omap_sham_init,
1683         .base.update            = omap_sham_update,
1684         .base.final             = omap_sham_final,
1685         .base.finup             = omap_sham_finup,
1686         .base.digest            = omap_sham_digest,
1687         .base.setkey            = omap_sham_setkey,
1688         .base.halg.digestsize   = SHA512_DIGEST_SIZE,
1689         .base.halg.base = {
1690                 .cra_name               = "hmac(sha512)",
1691                 .cra_driver_name        = "omap-hmac-sha512",
1692                 .cra_priority           = 400,
1693                 .cra_flags              = CRYPTO_ALG_KERN_DRIVER_ONLY |
1694                                                 CRYPTO_ALG_ASYNC |
1695                                                 CRYPTO_ALG_NEED_FALLBACK,
1696                 .cra_blocksize          = SHA512_BLOCK_SIZE,
1697                 .cra_ctxsize            = sizeof(struct omap_sham_ctx) +
1698                                         sizeof(struct omap_sham_hmac_ctx),
1699                 .cra_module             = THIS_MODULE,
1700                 .cra_init               = omap_sham_cra_sha512_init,
1701                 .cra_exit               = omap_sham_cra_exit,
1702         },
1703         .op.do_one_request = omap_sham_hash_one_req,
1704 },
1705 };
1706
1707 static void omap_sham_done_task(unsigned long data)
1708 {
1709         struct omap_sham_dev *dd = (struct omap_sham_dev *)data;
1710         int err = 0;
1711
1712         dev_dbg(dd->dev, "%s: flags=%lx\n", __func__, dd->flags);
1713
1714         if (test_bit(FLAGS_CPU, &dd->flags)) {
1715                 if (test_and_clear_bit(FLAGS_OUTPUT_READY, &dd->flags))
1716                         goto finish;
1717         } else if (test_bit(FLAGS_DMA_READY, &dd->flags)) {
1718                 if (test_bit(FLAGS_DMA_ACTIVE, &dd->flags)) {
1719                         omap_sham_update_dma_stop(dd);
1720                         if (dd->err) {
1721                                 err = dd->err;
1722                                 goto finish;
1723                         }
1724                 }
1725                 if (test_and_clear_bit(FLAGS_OUTPUT_READY, &dd->flags)) {
1726                         /* hash or semi-hash ready */
1727                         clear_bit(FLAGS_DMA_READY, &dd->flags);
1728                         goto finish;
1729                 }
1730         }
1731
1732         return;
1733
1734 finish:
1735         dev_dbg(dd->dev, "update done: err: %d\n", err);
1736         /* finish curent request */
1737         omap_sham_finish_req(dd->req, err);
1738 }
1739
1740 static irqreturn_t omap_sham_irq_common(struct omap_sham_dev *dd)
1741 {
1742         set_bit(FLAGS_OUTPUT_READY, &dd->flags);
1743         tasklet_schedule(&dd->done_task);
1744
1745         return IRQ_HANDLED;
1746 }
1747
1748 static irqreturn_t omap_sham_irq_omap2(int irq, void *dev_id)
1749 {
1750         struct omap_sham_dev *dd = dev_id;
1751
1752         if (unlikely(test_bit(FLAGS_FINAL, &dd->flags)))
1753                 /* final -> allow device to go to power-saving mode */
1754                 omap_sham_write_mask(dd, SHA_REG_CTRL, 0, SHA_REG_CTRL_LENGTH);
1755
1756         omap_sham_write_mask(dd, SHA_REG_CTRL, SHA_REG_CTRL_OUTPUT_READY,
1757                                  SHA_REG_CTRL_OUTPUT_READY);
1758         omap_sham_read(dd, SHA_REG_CTRL);
1759
1760         return omap_sham_irq_common(dd);
1761 }
1762
1763 static irqreturn_t omap_sham_irq_omap4(int irq, void *dev_id)
1764 {
1765         struct omap_sham_dev *dd = dev_id;
1766
1767         omap_sham_write_mask(dd, SHA_REG_MASK(dd), 0, SHA_REG_MASK_IT_EN);
1768
1769         return omap_sham_irq_common(dd);
1770 }
1771
1772 static struct omap_sham_algs_info omap_sham_algs_info_omap2[] = {
1773         {
1774                 .algs_list      = algs_sha1_md5,
1775                 .size           = ARRAY_SIZE(algs_sha1_md5),
1776         },
1777 };
1778
1779 static const struct omap_sham_pdata omap_sham_pdata_omap2 = {
1780         .algs_info      = omap_sham_algs_info_omap2,
1781         .algs_info_size = ARRAY_SIZE(omap_sham_algs_info_omap2),
1782         .flags          = BIT(FLAGS_BE32_SHA1),
1783         .digest_size    = SHA1_DIGEST_SIZE,
1784         .copy_hash      = omap_sham_copy_hash_omap2,
1785         .write_ctrl     = omap_sham_write_ctrl_omap2,
1786         .trigger        = omap_sham_trigger_omap2,
1787         .poll_irq       = omap_sham_poll_irq_omap2,
1788         .intr_hdlr      = omap_sham_irq_omap2,
1789         .idigest_ofs    = 0x00,
1790         .din_ofs        = 0x1c,
1791         .digcnt_ofs     = 0x14,
1792         .rev_ofs        = 0x5c,
1793         .mask_ofs       = 0x60,
1794         .sysstatus_ofs  = 0x64,
1795         .major_mask     = 0xf0,
1796         .major_shift    = 4,
1797         .minor_mask     = 0x0f,
1798         .minor_shift    = 0,
1799 };
1800
1801 #ifdef CONFIG_OF
1802 static struct omap_sham_algs_info omap_sham_algs_info_omap4[] = {
1803         {
1804                 .algs_list      = algs_sha1_md5,
1805                 .size           = ARRAY_SIZE(algs_sha1_md5),
1806         },
1807         {
1808                 .algs_list      = algs_sha224_sha256,
1809                 .size           = ARRAY_SIZE(algs_sha224_sha256),
1810         },
1811 };
1812
1813 static const struct omap_sham_pdata omap_sham_pdata_omap4 = {
1814         .algs_info      = omap_sham_algs_info_omap4,
1815         .algs_info_size = ARRAY_SIZE(omap_sham_algs_info_omap4),
1816         .flags          = BIT(FLAGS_AUTO_XOR),
1817         .digest_size    = SHA256_DIGEST_SIZE,
1818         .copy_hash      = omap_sham_copy_hash_omap4,
1819         .write_ctrl     = omap_sham_write_ctrl_omap4,
1820         .trigger        = omap_sham_trigger_omap4,
1821         .poll_irq       = omap_sham_poll_irq_omap4,
1822         .intr_hdlr      = omap_sham_irq_omap4,
1823         .idigest_ofs    = 0x020,
1824         .odigest_ofs    = 0x0,
1825         .din_ofs        = 0x080,
1826         .digcnt_ofs     = 0x040,
1827         .rev_ofs        = 0x100,
1828         .mask_ofs       = 0x110,
1829         .sysstatus_ofs  = 0x114,
1830         .mode_ofs       = 0x44,
1831         .length_ofs     = 0x48,
1832         .major_mask     = 0x0700,
1833         .major_shift    = 8,
1834         .minor_mask     = 0x003f,
1835         .minor_shift    = 0,
1836 };
1837
1838 static struct omap_sham_algs_info omap_sham_algs_info_omap5[] = {
1839         {
1840                 .algs_list      = algs_sha1_md5,
1841                 .size           = ARRAY_SIZE(algs_sha1_md5),
1842         },
1843         {
1844                 .algs_list      = algs_sha224_sha256,
1845                 .size           = ARRAY_SIZE(algs_sha224_sha256),
1846         },
1847         {
1848                 .algs_list      = algs_sha384_sha512,
1849                 .size           = ARRAY_SIZE(algs_sha384_sha512),
1850         },
1851 };
1852
1853 static const struct omap_sham_pdata omap_sham_pdata_omap5 = {
1854         .algs_info      = omap_sham_algs_info_omap5,
1855         .algs_info_size = ARRAY_SIZE(omap_sham_algs_info_omap5),
1856         .flags          = BIT(FLAGS_AUTO_XOR),
1857         .digest_size    = SHA512_DIGEST_SIZE,
1858         .copy_hash      = omap_sham_copy_hash_omap4,
1859         .write_ctrl     = omap_sham_write_ctrl_omap4,
1860         .trigger        = omap_sham_trigger_omap4,
1861         .poll_irq       = omap_sham_poll_irq_omap4,
1862         .intr_hdlr      = omap_sham_irq_omap4,
1863         .idigest_ofs    = 0x240,
1864         .odigest_ofs    = 0x200,
1865         .din_ofs        = 0x080,
1866         .digcnt_ofs     = 0x280,
1867         .rev_ofs        = 0x100,
1868         .mask_ofs       = 0x110,
1869         .sysstatus_ofs  = 0x114,
1870         .mode_ofs       = 0x284,
1871         .length_ofs     = 0x288,
1872         .major_mask     = 0x0700,
1873         .major_shift    = 8,
1874         .minor_mask     = 0x003f,
1875         .minor_shift    = 0,
1876 };
1877
1878 static const struct of_device_id omap_sham_of_match[] = {
1879         {
1880                 .compatible     = "ti,omap2-sham",
1881                 .data           = &omap_sham_pdata_omap2,
1882         },
1883         {
1884                 .compatible     = "ti,omap3-sham",
1885                 .data           = &omap_sham_pdata_omap2,
1886         },
1887         {
1888                 .compatible     = "ti,omap4-sham",
1889                 .data           = &omap_sham_pdata_omap4,
1890         },
1891         {
1892                 .compatible     = "ti,omap5-sham",
1893                 .data           = &omap_sham_pdata_omap5,
1894         },
1895         {},
1896 };
1897 MODULE_DEVICE_TABLE(of, omap_sham_of_match);
1898
1899 static int omap_sham_get_res_of(struct omap_sham_dev *dd,
1900                 struct device *dev, struct resource *res)
1901 {
1902         struct device_node *node = dev->of_node;
1903         int err = 0;
1904
1905         dd->pdata = of_device_get_match_data(dev);
1906         if (!dd->pdata) {
1907                 dev_err(dev, "no compatible OF match\n");
1908                 err = -EINVAL;
1909                 goto err;
1910         }
1911
1912         err = of_address_to_resource(node, 0, res);
1913         if (err < 0) {
1914                 dev_err(dev, "can't translate OF node address\n");
1915                 err = -EINVAL;
1916                 goto err;
1917         }
1918
1919         dd->irq = irq_of_parse_and_map(node, 0);
1920         if (!dd->irq) {
1921                 dev_err(dev, "can't translate OF irq value\n");
1922                 err = -EINVAL;
1923                 goto err;
1924         }
1925
1926 err:
1927         return err;
1928 }
1929 #else
1930 static const struct of_device_id omap_sham_of_match[] = {
1931         {},
1932 };
1933
1934 static int omap_sham_get_res_of(struct omap_sham_dev *dd,
1935                 struct device *dev, struct resource *res)
1936 {
1937         return -EINVAL;
1938 }
1939 #endif
1940
1941 static int omap_sham_get_res_pdev(struct omap_sham_dev *dd,
1942                 struct platform_device *pdev, struct resource *res)
1943 {
1944         struct device *dev = &pdev->dev;
1945         struct resource *r;
1946         int err = 0;
1947
1948         /* Get the base address */
1949         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1950         if (!r) {
1951                 dev_err(dev, "no MEM resource info\n");
1952                 err = -ENODEV;
1953                 goto err;
1954         }
1955         memcpy(res, r, sizeof(*res));
1956
1957         /* Get the IRQ */
1958         dd->irq = platform_get_irq(pdev, 0);
1959         if (dd->irq < 0) {
1960                 err = dd->irq;
1961                 goto err;
1962         }
1963
1964         /* Only OMAP2/3 can be non-DT */
1965         dd->pdata = &omap_sham_pdata_omap2;
1966
1967 err:
1968         return err;
1969 }
1970
1971 static ssize_t fallback_show(struct device *dev, struct device_attribute *attr,
1972                              char *buf)
1973 {
1974         struct omap_sham_dev *dd = dev_get_drvdata(dev);
1975
1976         return sprintf(buf, "%d\n", dd->fallback_sz);
1977 }
1978
1979 static ssize_t fallback_store(struct device *dev, struct device_attribute *attr,
1980                               const char *buf, size_t size)
1981 {
1982         struct omap_sham_dev *dd = dev_get_drvdata(dev);
1983         ssize_t status;
1984         long value;
1985
1986         status = kstrtol(buf, 0, &value);
1987         if (status)
1988                 return status;
1989
1990         /* HW accelerator only works with buffers > 9 */
1991         if (value < 9) {
1992                 dev_err(dev, "minimum fallback size 9\n");
1993                 return -EINVAL;
1994         }
1995
1996         dd->fallback_sz = value;
1997
1998         return size;
1999 }
2000
2001 static ssize_t queue_len_show(struct device *dev, struct device_attribute *attr,
2002                               char *buf)
2003 {
2004         struct omap_sham_dev *dd = dev_get_drvdata(dev);
2005
2006         return sprintf(buf, "%d\n", dd->queue.max_qlen);
2007 }
2008
2009 static ssize_t queue_len_store(struct device *dev,
2010                                struct device_attribute *attr, const char *buf,
2011                                size_t size)
2012 {
2013         struct omap_sham_dev *dd = dev_get_drvdata(dev);
2014         ssize_t status;
2015         long value;
2016
2017         status = kstrtol(buf, 0, &value);
2018         if (status)
2019                 return status;
2020
2021         if (value < 1)
2022                 return -EINVAL;
2023
2024         /*
2025          * Changing the queue size in fly is safe, if size becomes smaller
2026          * than current size, it will just not accept new entries until
2027          * it has shrank enough.
2028          */
2029         dd->queue.max_qlen = value;
2030
2031         return size;
2032 }
2033
2034 static DEVICE_ATTR_RW(queue_len);
2035 static DEVICE_ATTR_RW(fallback);
2036
2037 static struct attribute *omap_sham_attrs[] = {
2038         &dev_attr_queue_len.attr,
2039         &dev_attr_fallback.attr,
2040         NULL,
2041 };
2042
2043 static const struct attribute_group omap_sham_attr_group = {
2044         .attrs = omap_sham_attrs,
2045 };
2046
2047 static int omap_sham_probe(struct platform_device *pdev)
2048 {
2049         struct omap_sham_dev *dd;
2050         struct device *dev = &pdev->dev;
2051         struct resource res;
2052         dma_cap_mask_t mask;
2053         int err, i, j;
2054         u32 rev;
2055
2056         dd = devm_kzalloc(dev, sizeof(struct omap_sham_dev), GFP_KERNEL);
2057         if (dd == NULL) {
2058                 dev_err(dev, "unable to alloc data struct.\n");
2059                 err = -ENOMEM;
2060                 goto data_err;
2061         }
2062         dd->dev = dev;
2063         platform_set_drvdata(pdev, dd);
2064
2065         INIT_LIST_HEAD(&dd->list);
2066         tasklet_init(&dd->done_task, omap_sham_done_task, (unsigned long)dd);
2067         crypto_init_queue(&dd->queue, OMAP_SHAM_QUEUE_LENGTH);
2068
2069         err = (dev->of_node) ? omap_sham_get_res_of(dd, dev, &res) :
2070                                omap_sham_get_res_pdev(dd, pdev, &res);
2071         if (err)
2072                 goto data_err;
2073
2074         dd->io_base = devm_ioremap_resource(dev, &res);
2075         if (IS_ERR(dd->io_base)) {
2076                 err = PTR_ERR(dd->io_base);
2077                 goto data_err;
2078         }
2079         dd->phys_base = res.start;
2080
2081         err = devm_request_irq(dev, dd->irq, dd->pdata->intr_hdlr,
2082                                IRQF_TRIGGER_NONE, dev_name(dev), dd);
2083         if (err) {
2084                 dev_err(dev, "unable to request irq %d, err = %d\n",
2085                         dd->irq, err);
2086                 goto data_err;
2087         }
2088
2089         dma_cap_zero(mask);
2090         dma_cap_set(DMA_SLAVE, mask);
2091
2092         dd->dma_lch = dma_request_chan(dev, "rx");
2093         if (IS_ERR(dd->dma_lch)) {
2094                 err = PTR_ERR(dd->dma_lch);
2095                 if (err == -EPROBE_DEFER)
2096                         goto data_err;
2097
2098                 dd->polling_mode = 1;
2099                 dev_dbg(dev, "using polling mode instead of dma\n");
2100         }
2101
2102         dd->flags |= dd->pdata->flags;
2103         sham.flags |= dd->pdata->flags;
2104
2105         pm_runtime_use_autosuspend(dev);
2106         pm_runtime_set_autosuspend_delay(dev, DEFAULT_AUTOSUSPEND_DELAY);
2107
2108         dd->fallback_sz = OMAP_SHA_DMA_THRESHOLD;
2109
2110         pm_runtime_enable(dev);
2111
2112         err = pm_runtime_resume_and_get(dev);
2113         if (err < 0) {
2114                 dev_err(dev, "failed to get sync: %d\n", err);
2115                 goto err_pm;
2116         }
2117
2118         rev = omap_sham_read(dd, SHA_REG_REV(dd));
2119         pm_runtime_put_sync(&pdev->dev);
2120
2121         dev_info(dev, "hw accel on OMAP rev %u.%u\n",
2122                 (rev & dd->pdata->major_mask) >> dd->pdata->major_shift,
2123                 (rev & dd->pdata->minor_mask) >> dd->pdata->minor_shift);
2124
2125         spin_lock_bh(&sham.lock);
2126         list_add_tail(&dd->list, &sham.dev_list);
2127         spin_unlock_bh(&sham.lock);
2128
2129         dd->engine = crypto_engine_alloc_init(dev, 1);
2130         if (!dd->engine) {
2131                 err = -ENOMEM;
2132                 goto err_engine;
2133         }
2134
2135         err = crypto_engine_start(dd->engine);
2136         if (err)
2137                 goto err_engine_start;
2138
2139         for (i = 0; i < dd->pdata->algs_info_size; i++) {
2140                 if (dd->pdata->algs_info[i].registered)
2141                         break;
2142
2143                 for (j = 0; j < dd->pdata->algs_info[i].size; j++) {
2144                         struct ahash_engine_alg *ealg;
2145                         struct ahash_alg *alg;
2146
2147                         ealg = &dd->pdata->algs_info[i].algs_list[j];
2148                         alg = &ealg->base;
2149                         alg->export = omap_sham_export;
2150                         alg->import = omap_sham_import;
2151                         alg->halg.statesize = sizeof(struct omap_sham_reqctx) +
2152                                               BUFLEN;
2153                         err = crypto_engine_register_ahash(ealg);
2154                         if (err)
2155                                 goto err_algs;
2156
2157                         dd->pdata->algs_info[i].registered++;
2158                 }
2159         }
2160
2161         err = sysfs_create_group(&dev->kobj, &omap_sham_attr_group);
2162         if (err) {
2163                 dev_err(dev, "could not create sysfs device attrs\n");
2164                 goto err_algs;
2165         }
2166
2167         return 0;
2168
2169 err_algs:
2170         for (i = dd->pdata->algs_info_size - 1; i >= 0; i--)
2171                 for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--)
2172                         crypto_engine_unregister_ahash(
2173                                         &dd->pdata->algs_info[i].algs_list[j]);
2174 err_engine_start:
2175         crypto_engine_exit(dd->engine);
2176 err_engine:
2177         spin_lock_bh(&sham.lock);
2178         list_del(&dd->list);
2179         spin_unlock_bh(&sham.lock);
2180 err_pm:
2181         pm_runtime_dont_use_autosuspend(dev);
2182         pm_runtime_disable(dev);
2183         if (!dd->polling_mode)
2184                 dma_release_channel(dd->dma_lch);
2185 data_err:
2186         dev_err(dev, "initialization failed.\n");
2187
2188         return err;
2189 }
2190
2191 static void omap_sham_remove(struct platform_device *pdev)
2192 {
2193         struct omap_sham_dev *dd;
2194         int i, j;
2195
2196         dd = platform_get_drvdata(pdev);
2197
2198         spin_lock_bh(&sham.lock);
2199         list_del(&dd->list);
2200         spin_unlock_bh(&sham.lock);
2201         for (i = dd->pdata->algs_info_size - 1; i >= 0; i--)
2202                 for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--) {
2203                         crypto_engine_unregister_ahash(
2204                                         &dd->pdata->algs_info[i].algs_list[j]);
2205                         dd->pdata->algs_info[i].registered--;
2206                 }
2207         tasklet_kill(&dd->done_task);
2208         pm_runtime_dont_use_autosuspend(&pdev->dev);
2209         pm_runtime_disable(&pdev->dev);
2210
2211         if (!dd->polling_mode)
2212                 dma_release_channel(dd->dma_lch);
2213
2214         sysfs_remove_group(&dd->dev->kobj, &omap_sham_attr_group);
2215 }
2216
2217 static struct platform_driver omap_sham_driver = {
2218         .probe  = omap_sham_probe,
2219         .remove_new = omap_sham_remove,
2220         .driver = {
2221                 .name   = "omap-sham",
2222                 .of_match_table = omap_sham_of_match,
2223         },
2224 };
2225
2226 module_platform_driver(omap_sham_driver);
2227
2228 MODULE_DESCRIPTION("OMAP SHA1/MD5 hw acceleration support.");
2229 MODULE_LICENSE("GPL v2");
2230 MODULE_AUTHOR("Dmitry Kasatkin");
2231 MODULE_ALIAS("platform:omap-sham");