drivers/crypto/omap-sham.c

   1 /*
   2  * Cryptographic API.
   3  *
   4  * Support for OMAP SHA1/MD5 HW acceleration.
   5  *
   6  * Copyright (c) 2010 Nokia Corporation
   7  * Author: Dmitry Kasatkin <[email protected]>
   8  * Copyright (c) 2011 Texas Instruments Incorporated
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as published
  12  * by the Free Software Foundation.
  13  *
  14  * Some ideas are from old omap-sha1-md5.c driver.
  15  */
  16
  17 #define pr_fmt(fmt) "%s: " fmt, __func__
  18
  19 #include <linux/err.h>
  20 #include <linux/device.h>
  21 #include <linux/module.h>
  22 #include <linux/init.h>
  23 #include <linux/errno.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/kernel.h>
  26 #include <linux/irq.h>
  27 #include <linux/io.h>
  28 #include <linux/platform_device.h>
  29 #include <linux/scatterlist.h>
  30 #include <linux/dma-mapping.h>
  31 #include <linux/dmaengine.h>
  32 #include <linux/pm_runtime.h>
  33 #include <linux/of.h>
  34 #include <linux/of_device.h>
  35 #include <linux/of_address.h>
  36 #include <linux/of_irq.h>
  37 #include <linux/delay.h>
  38 #include <linux/crypto.h>
  39 #include <linux/cryptohash.h>
  40 #include <crypto/scatterwalk.h>
  41 #include <crypto/algapi.h>
  42 #include <crypto/sha.h>
  43 #include <crypto/hash.h>
  44 #include <crypto/hmac.h>
  45 #include <crypto/internal/hash.h>
  46
  47 #define MD5_DIGEST_SIZE                 16
  48
  49 #define SHA_REG_IDIGEST(dd, x)          ((dd)->pdata->idigest_ofs + ((x)*0x04))
  50 #define SHA_REG_DIN(dd, x)              ((dd)->pdata->din_ofs + ((x) * 0x04))
  51 #define SHA_REG_DIGCNT(dd)              ((dd)->pdata->digcnt_ofs)
  52
  53 #define SHA_REG_ODIGEST(dd, x)          ((dd)->pdata->odigest_ofs + (x * 0x04))
  54
  55 #define SHA_REG_CTRL                    0x18
  56 #define SHA_REG_CTRL_LENGTH             (0xFFFFFFFF << 5)
  57 #define SHA_REG_CTRL_CLOSE_HASH         (1 << 4)
  58 #define SHA_REG_CTRL_ALGO_CONST         (1 << 3)
  59 #define SHA_REG_CTRL_ALGO               (1 << 2)
  60 #define SHA_REG_CTRL_INPUT_READY        (1 << 1)
  61 #define SHA_REG_CTRL_OUTPUT_READY       (1 << 0)
  62
  63 #define SHA_REG_REV(dd)                 ((dd)->pdata->rev_ofs)
  64
  65 #define SHA_REG_MASK(dd)                ((dd)->pdata->mask_ofs)
  66 #define SHA_REG_MASK_DMA_EN             (1 << 3)
  67 #define SHA_REG_MASK_IT_EN              (1 << 2)
  68 #define SHA_REG_MASK_SOFTRESET          (1 << 1)
  69 #define SHA_REG_AUTOIDLE                (1 << 0)
  70
  71 #define SHA_REG_SYSSTATUS(dd)           ((dd)->pdata->sysstatus_ofs)
  72 #define SHA_REG_SYSSTATUS_RESETDONE     (1 << 0)
  73
  74 #define SHA_REG_MODE(dd)                ((dd)->pdata->mode_ofs)
  75 #define SHA_REG_MODE_HMAC_OUTER_HASH    (1 << 7)
  76 #define SHA_REG_MODE_HMAC_KEY_PROC      (1 << 5)
  77 #define SHA_REG_MODE_CLOSE_HASH         (1 << 4)
  78 #define SHA_REG_MODE_ALGO_CONSTANT      (1 << 3)
  79
  80 #define SHA_REG_MODE_ALGO_MASK          (7 << 0)
  81 #define SHA_REG_MODE_ALGO_MD5_128       (0 << 1)
  82 #define SHA_REG_MODE_ALGO_SHA1_160      (1 << 1)
  83 #define SHA_REG_MODE_ALGO_SHA2_224      (2 << 1)
  84 #define SHA_REG_MODE_ALGO_SHA2_256      (3 << 1)
  85 #define SHA_REG_MODE_ALGO_SHA2_384      (1 << 0)
  86 #define SHA_REG_MODE_ALGO_SHA2_512      (3 << 0)
  87
  88 #define SHA_REG_LENGTH(dd)              ((dd)->pdata->length_ofs)
  89
  90 #define SHA_REG_IRQSTATUS               0x118
  91 #define SHA_REG_IRQSTATUS_CTX_RDY       (1 << 3)
  92 #define SHA_REG_IRQSTATUS_PARTHASH_RDY (1 << 2)
  93 #define SHA_REG_IRQSTATUS_INPUT_RDY     (1 << 1)
  94 #define SHA_REG_IRQSTATUS_OUTPUT_RDY    (1 << 0)
  95
  96 #define SHA_REG_IRQENA                  0x11C
  97 #define SHA_REG_IRQENA_CTX_RDY          (1 << 3)
  98 #define SHA_REG_IRQENA_PARTHASH_RDY     (1 << 2)
  99 #define SHA_REG_IRQENA_INPUT_RDY        (1 << 1)
 100 #define SHA_REG_IRQENA_OUTPUT_RDY       (1 << 0)
 101
 102 #define DEFAULT_TIMEOUT_INTERVAL        HZ
 103
 104 #define DEFAULT_AUTOSUSPEND_DELAY       1000
 105
 106 /* mostly device flags */
 107 #define FLAGS_BUSY              0
 108 #define FLAGS_FINAL             1
 109 #define FLAGS_DMA_ACTIVE        2
 110 #define FLAGS_OUTPUT_READY      3
 111 #define FLAGS_INIT              4
 112 #define FLAGS_CPU               5
 113 #define FLAGS_DMA_READY         6
 114 #define FLAGS_AUTO_XOR          7
 115 #define FLAGS_BE32_SHA1         8
 116 #define FLAGS_SGS_COPIED        9
 117 #define FLAGS_SGS_ALLOCED       10
 118 /* context flags */
 119 #define FLAGS_FINUP             16
 120
 121 #define FLAGS_MODE_SHIFT        18
 122 #define FLAGS_MODE_MASK         (SHA_REG_MODE_ALGO_MASK << FLAGS_MODE_SHIFT)
 123 #define FLAGS_MODE_MD5          (SHA_REG_MODE_ALGO_MD5_128 << FLAGS_MODE_SHIFT)
 124 #define FLAGS_MODE_SHA1         (SHA_REG_MODE_ALGO_SHA1_160 << FLAGS_MODE_SHIFT)
 125 #define FLAGS_MODE_SHA224       (SHA_REG_MODE_ALGO_SHA2_224 << FLAGS_MODE_SHIFT)
 126 #define FLAGS_MODE_SHA256       (SHA_REG_MODE_ALGO_SHA2_256 << FLAGS_MODE_SHIFT)
 127 #define FLAGS_MODE_SHA384       (SHA_REG_MODE_ALGO_SHA2_384 << FLAGS_MODE_SHIFT)
 128 #define FLAGS_MODE_SHA512       (SHA_REG_MODE_ALGO_SHA2_512 << FLAGS_MODE_SHIFT)
 129
 130 #define FLAGS_HMAC              21
 131 #define FLAGS_ERROR             22
 132
 133 #define OP_UPDATE               1
 134 #define OP_FINAL                2
 135
 136 #define OMAP_ALIGN_MASK         (sizeof(u32)-1)
 137 #define OMAP_ALIGNED            __attribute__((aligned(sizeof(u32))))
 138
 139 #define BUFLEN                  SHA512_BLOCK_SIZE
 140 #define OMAP_SHA_DMA_THRESHOLD  256
 141
 142 struct omap_sham_dev;
 143
 144 struct omap_sham_reqctx {
 145         struct omap_sham_dev    *dd;
 146         unsigned long           flags;
 147         unsigned long           op;
 148
 149         u8                      digest[SHA512_DIGEST_SIZE] OMAP_ALIGNED;
 150         size_t                  digcnt;
 151         size_t                  bufcnt;
 152         size_t                  buflen;
 153
 154         /* walk state */
 155         struct scatterlist      *sg;
 156         struct scatterlist      sgl[2];
 157         int                     offset; /* offset in current sg */
 158         int                     sg_len;
 159         unsigned int            total;  /* total request */
 160
 161         u8                      buffer[0] OMAP_ALIGNED;
 162 };
 163
 164 struct omap_sham_hmac_ctx {
 165         struct crypto_shash     *shash;
 166         u8                      ipad[SHA512_BLOCK_SIZE] OMAP_ALIGNED;
 167         u8                      opad[SHA512_BLOCK_SIZE] OMAP_ALIGNED;
 168 };
 169
 170 struct omap_sham_ctx {
 171         struct omap_sham_dev    *dd;
 172
 173         unsigned long           flags;
 174
 175         /* fallback stuff */
 176         struct crypto_shash     *fallback;
 177
 178         struct omap_sham_hmac_ctx base[0];
 179 };
 180
 181 #define OMAP_SHAM_QUEUE_LENGTH  10
 182
 183 struct omap_sham_algs_info {
 184         struct ahash_alg        *algs_list;
 185         unsigned int            size;
 186         unsigned int            registered;
 187 };
 188
 189 struct omap_sham_pdata {
 190         struct omap_sham_algs_info      *algs_info;
 191         unsigned int    algs_info_size;
 192         unsigned long   flags;
 193         int             digest_size;
 194
 195         void            (*copy_hash)(struct ahash_request *req, int out);
 196         void            (*write_ctrl)(struct omap_sham_dev *dd, size_t length,
 197                                       int final, int dma);
 198         void            (*trigger)(struct omap_sham_dev *dd, size_t length);
 199         int             (*poll_irq)(struct omap_sham_dev *dd);
 200         irqreturn_t     (*intr_hdlr)(int irq, void *dev_id);
 201
 202         u32             odigest_ofs;
 203         u32             idigest_ofs;
 204         u32             din_ofs;
 205         u32             digcnt_ofs;
 206         u32             rev_ofs;
 207         u32             mask_ofs;
 208         u32             sysstatus_ofs;
 209         u32             mode_ofs;
 210         u32             length_ofs;
 211
 212         u32             major_mask;
 213         u32             major_shift;
 214         u32             minor_mask;
 215         u32             minor_shift;
 216 };
 217
 218 struct omap_sham_dev {
 219         struct list_head        list;
 220         unsigned long           phys_base;
 221         struct device           *dev;
 222         void __iomem            *io_base;
 223         int                     irq;
 224         spinlock_t              lock;
 225         int                     err;
 226         struct dma_chan         *dma_lch;
 227         struct tasklet_struct   done_task;
 228         u8                      polling_mode;
 229         u8                      xmit_buf[BUFLEN] OMAP_ALIGNED;
 230
 231         unsigned long           flags;
 232         int                     fallback_sz;
 233         struct crypto_queue     queue;
 234         struct ahash_request    *req;
 235
 236         const struct omap_sham_pdata    *pdata;
 237 };
 238
 239 struct omap_sham_drv {
 240         struct list_head        dev_list;
 241         spinlock_t              lock;
 242         unsigned long           flags;
 243 };
 244
 245 static struct omap_sham_drv sham = {
 246         .dev_list = LIST_HEAD_INIT(sham.dev_list),
 247         .lock = __SPIN_LOCK_UNLOCKED(sham.lock),
 248 };
 249
 250 static inline u32 omap_sham_read(struct omap_sham_dev *dd, u32 offset)
 251 {
 252         return __raw_readl(dd->io_base + offset);
 253 }
 254
 255 static inline void omap_sham_write(struct omap_sham_dev *dd,
 256                                         u32 offset, u32 value)
 257 {
 258         __raw_writel(value, dd->io_base + offset);
 259 }
 260
 261 static inline void omap_sham_write_mask(struct omap_sham_dev *dd, u32 address,
 262                                         u32 value, u32 mask)
 263 {
 264         u32 val;
 265
 266         val = omap_sham_read(dd, address);
 267         val &= ~mask;
 268         val |= value;
 269         omap_sham_write(dd, address, val);
 270 }
 271
 272 static inline int omap_sham_wait(struct omap_sham_dev *dd, u32 offset, u32 bit)
 273 {
 274         unsigned long timeout = jiffies + DEFAULT_TIMEOUT_INTERVAL;
 275
 276         while (!(omap_sham_read(dd, offset) & bit)) {
 277                 if (time_is_before_jiffies(timeout))
 278                         return -ETIMEDOUT;
 279         }
 280
 281         return 0;
 282 }
 283
 284 static void omap_sham_copy_hash_omap2(struct ahash_request *req, int out)
 285 {
 286         struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
 287         struct omap_sham_dev *dd = ctx->dd;
 288         u32 *hash = (u32 *)ctx->digest;
 289         int i;
 290
 291         for (i = 0; i < dd->pdata->digest_size / sizeof(u32); i++) {
 292                 if (out)
 293                         hash[i] = omap_sham_read(dd, SHA_REG_IDIGEST(dd, i));
 294                 else
 295                         omap_sham_write(dd, SHA_REG_IDIGEST(dd, i), hash[i]);
 296         }
 297 }
 298
 299 static void omap_sham_copy_hash_omap4(struct ahash_request *req, int out)
 300 {
 301         struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
 302         struct omap_sham_dev *dd = ctx->dd;
 303         int i;
 304
 305         if (ctx->flags & BIT(FLAGS_HMAC)) {
 306                 struct crypto_ahash *tfm = crypto_ahash_reqtfm(dd->req);
 307                 struct omap_sham_ctx *tctx = crypto_ahash_ctx(tfm);
 308                 struct omap_sham_hmac_ctx *bctx = tctx->base;
 309                 u32 *opad = (u32 *)bctx->opad;
 310
 311                 for (i = 0; i < dd->pdata->digest_size / sizeof(u32); i++) {
 312                         if (out)
 313                                 opad[i] = omap_sham_read(dd,
 314                                                 SHA_REG_ODIGEST(dd, i));
 315                         else
 316                                 omap_sham_write(dd, SHA_REG_ODIGEST(dd, i),
 317                                                 opad[i]);
 318                 }
 319         }
 320
 321         omap_sham_copy_hash_omap2(req, out);
 322 }
 323
 324 static void omap_sham_copy_ready_hash(struct ahash_request *req)
 325 {
 326         struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
 327         u32 *in = (u32 *)ctx->digest;
 328         u32 *hash = (u32 *)req->result;
 329         int i, d, big_endian = 0;
 330
 331         if (!hash)
 332                 return;
 333
 334         switch (ctx->flags & FLAGS_MODE_MASK) {
 335         case FLAGS_MODE_MD5:
 336                 d = MD5_DIGEST_SIZE / sizeof(u32);
 337                 break;
 338         case FLAGS_MODE_SHA1:
 339                 /* OMAP2 SHA1 is big endian */
 340                 if (test_bit(FLAGS_BE32_SHA1, &ctx->dd->flags))
 341                         big_endian = 1;
 342                 d = SHA1_DIGEST_SIZE / sizeof(u32);
 343                 break;
 344         case FLAGS_MODE_SHA224:
 345                 d = SHA224_DIGEST_SIZE / sizeof(u32);
 346                 break;
 347         case FLAGS_MODE_SHA256:
 348                 d = SHA256_DIGEST_SIZE / sizeof(u32);
 349                 break;
 350         case FLAGS_MODE_SHA384:
 351                 d = SHA384_DIGEST_SIZE / sizeof(u32);
 352                 break;
 353         case FLAGS_MODE_SHA512:
 354                 d = SHA512_DIGEST_SIZE / sizeof(u32);
 355                 break;
 356         default:
 357                 d = 0;
 358         }
 359
 360         if (big_endian)
 361                 for (i = 0; i < d; i++)
 362                         hash[i] = be32_to_cpu(in[i]);
 363         else
 364                 for (i = 0; i < d; i++)
 365                         hash[i] = le32_to_cpu(in[i]);
 366 }
 367
 368 static int omap_sham_hw_init(struct omap_sham_dev *dd)
 369 {
 370         int err;
 371
 372         err = pm_runtime_get_sync(dd->dev);
 373         if (err < 0) {
 374                 dev_err(dd->dev, "failed to get sync: %d\n", err);
 375                 return err;
 376         }
 377
 378         if (!test_bit(FLAGS_INIT, &dd->flags)) {
 379                 set_bit(FLAGS_INIT, &dd->flags);
 380                 dd->err = 0;
 381         }
 382
 383         return 0;
 384 }
 385
 386 static void omap_sham_write_ctrl_omap2(struct omap_sham_dev *dd, size_t length,
 387                                  int final, int dma)
 388 {
 389         struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
 390         u32 val = length << 5, mask;
 391
 392         if (likely(ctx->digcnt))
 393                 omap_sham_write(dd, SHA_REG_DIGCNT(dd), ctx->digcnt);
 394
 395         omap_sham_write_mask(dd, SHA_REG_MASK(dd),
 396                 SHA_REG_MASK_IT_EN | (dma ? SHA_REG_MASK_DMA_EN : 0),
 397                 SHA_REG_MASK_IT_EN | SHA_REG_MASK_DMA_EN);
 398         /*
 399          * Setting ALGO_CONST only for the first iteration
 400          * and CLOSE_HASH only for the last one.
 401          */
 402         if ((ctx->flags & FLAGS_MODE_MASK) == FLAGS_MODE_SHA1)
 403                 val |= SHA_REG_CTRL_ALGO;
 404         if (!ctx->digcnt)
 405                 val |= SHA_REG_CTRL_ALGO_CONST;
 406         if (final)
 407                 val |= SHA_REG_CTRL_CLOSE_HASH;
 408
 409         mask = SHA_REG_CTRL_ALGO_CONST | SHA_REG_CTRL_CLOSE_HASH |
 410                         SHA_REG_CTRL_ALGO | SHA_REG_CTRL_LENGTH;
 411
 412         omap_sham_write_mask(dd, SHA_REG_CTRL, val, mask);
 413 }
 414
 415 static void omap_sham_trigger_omap2(struct omap_sham_dev *dd, size_t length)
 416 {
 417 }
 418
 419 static int omap_sham_poll_irq_omap2(struct omap_sham_dev *dd)
 420 {
 421         return omap_sham_wait(dd, SHA_REG_CTRL, SHA_REG_CTRL_INPUT_READY);
 422 }
 423
 424 static int get_block_size(struct omap_sham_reqctx *ctx)
 425 {
 426         int d;
 427
 428         switch (ctx->flags & FLAGS_MODE_MASK) {
 429         case FLAGS_MODE_MD5:
 430         case FLAGS_MODE_SHA1:
 431                 d = SHA1_BLOCK_SIZE;
 432                 break;
 433         case FLAGS_MODE_SHA224:
 434         case FLAGS_MODE_SHA256:
 435                 d = SHA256_BLOCK_SIZE;
 436                 break;
 437         case FLAGS_MODE_SHA384:
 438         case FLAGS_MODE_SHA512:
 439                 d = SHA512_BLOCK_SIZE;
 440                 break;
 441         default:
 442                 d = 0;
 443         }
 444
 445         return d;
 446 }
 447
 448 static void omap_sham_write_n(struct omap_sham_dev *dd, u32 offset,
 449                                     u32 *value, int count)
 450 {
 451         for (; count--; value++, offset += 4)
 452                 omap_sham_write(dd, offset, *value);
 453 }
 454
 455 static void omap_sham_write_ctrl_omap4(struct omap_sham_dev *dd, size_t length,
 456                                  int final, int dma)
 457 {
 458         struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
 459         u32 val, mask;
 460
 461         /*
 462          * Setting ALGO_CONST only for the first iteration and
 463          * CLOSE_HASH only for the last one. Note that flags mode bits
 464          * correspond to algorithm encoding in mode register.
 465          */
 466         val = (ctx->flags & FLAGS_MODE_MASK) >> (FLAGS_MODE_SHIFT);
 467         if (!ctx->digcnt) {
 468                 struct crypto_ahash *tfm = crypto_ahash_reqtfm(dd->req);
 469                 struct omap_sham_ctx *tctx = crypto_ahash_ctx(tfm);
 470                 struct omap_sham_hmac_ctx *bctx = tctx->base;
 471                 int bs, nr_dr;
 472
 473                 val |= SHA_REG_MODE_ALGO_CONSTANT;
 474
 475                 if (ctx->flags & BIT(FLAGS_HMAC)) {
 476                         bs = get_block_size(ctx);
 477                         nr_dr = bs / (2 * sizeof(u32));
 478                         val |= SHA_REG_MODE_HMAC_KEY_PROC;
 479                         omap_sham_write_n(dd, SHA_REG_ODIGEST(dd, 0),
 480                                           (u32 *)bctx->ipad, nr_dr);
 481                         omap_sham_write_n(dd, SHA_REG_IDIGEST(dd, 0),
 482                                           (u32 *)bctx->ipad + nr_dr, nr_dr);
 483                         ctx->digcnt += bs;
 484                 }
 485         }
 486
 487         if (final) {
 488                 val |= SHA_REG_MODE_CLOSE_HASH;
 489
 490                 if (ctx->flags & BIT(FLAGS_HMAC))
 491                         val |= SHA_REG_MODE_HMAC_OUTER_HASH;
 492         }
 493
 494         mask = SHA_REG_MODE_ALGO_CONSTANT | SHA_REG_MODE_CLOSE_HASH |
 495                SHA_REG_MODE_ALGO_MASK | SHA_REG_MODE_HMAC_OUTER_HASH |
 496                SHA_REG_MODE_HMAC_KEY_PROC;
 497
 498         dev_dbg(dd->dev, "ctrl: %08x, flags: %08lx\n", val, ctx->flags);
 499         omap_sham_write_mask(dd, SHA_REG_MODE(dd), val, mask);
 500         omap_sham_write(dd, SHA_REG_IRQENA, SHA_REG_IRQENA_OUTPUT_RDY);
 501         omap_sham_write_mask(dd, SHA_REG_MASK(dd),
 502                              SHA_REG_MASK_IT_EN |
 503                                      (dma ? SHA_REG_MASK_DMA_EN : 0),
 504                              SHA_REG_MASK_IT_EN | SHA_REG_MASK_DMA_EN);
 505 }
 506
 507 static void omap_sham_trigger_omap4(struct omap_sham_dev *dd, size_t length)
 508 {
 509         omap_sham_write(dd, SHA_REG_LENGTH(dd), length);
 510 }
 511
 512 static int omap_sham_poll_irq_omap4(struct omap_sham_dev *dd)
 513 {
 514         return omap_sham_wait(dd, SHA_REG_IRQSTATUS,
 515                               SHA_REG_IRQSTATUS_INPUT_RDY);
 516 }
 517
 518 static int omap_sham_xmit_cpu(struct omap_sham_dev *dd, size_t length,
 519                               int final)
 520 {
 521         struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
 522         int count, len32, bs32, offset = 0;
 523         const u32 *buffer;
 524         int mlen;
 525         struct sg_mapping_iter mi;
 526
 527         dev_dbg(dd->dev, "xmit_cpu: digcnt: %d, length: %d, final: %d\n",
 528                                                 ctx->digcnt, length, final);
 529
 530         dd->pdata->write_ctrl(dd, length, final, 0);
 531         dd->pdata->trigger(dd, length);
 532
 533         /* should be non-zero before next lines to disable clocks later */
 534         ctx->digcnt += length;
 535         ctx->total -= length;
 536
 537         if (final)
 538                 set_bit(FLAGS_FINAL, &dd->flags); /* catch last interrupt */
 539
 540         set_bit(FLAGS_CPU, &dd->flags);
 541
 542         len32 = DIV_ROUND_UP(length, sizeof(u32));
 543         bs32 = get_block_size(ctx) / sizeof(u32);
 544
 545         sg_miter_start(&mi, ctx->sg, ctx->sg_len,
 546                        SG_MITER_FROM_SG | SG_MITER_ATOMIC);
 547
 548         mlen = 0;
 549
 550         while (len32) {
 551                 if (dd->pdata->poll_irq(dd))
 552                         return -ETIMEDOUT;
 553
 554                 for (count = 0; count < min(len32, bs32); count++, offset++) {
 555                         if (!mlen) {
 556                                 sg_miter_next(&mi);
 557                                 mlen = mi.length;
 558                                 if (!mlen) {
 559                                         pr_err("sg miter failure.\n");
 560                                         return -EINVAL;
 561                                 }
 562                                 offset = 0;
 563                                 buffer = mi.addr;
 564                         }
 565                         omap_sham_write(dd, SHA_REG_DIN(dd, count),
 566                                         buffer[offset]);
 567                         mlen -= 4;
 568                 }
 569                 len32 -= min(len32, bs32);
 570         }
 571
 572         sg_miter_stop(&mi);
 573
 574         return -EINPROGRESS;
 575 }
 576
 577 static void omap_sham_dma_callback(void *param)
 578 {
 579         struct omap_sham_dev *dd = param;
 580
 581         set_bit(FLAGS_DMA_READY, &dd->flags);
 582         tasklet_schedule(&dd->done_task);
 583 }
 584
 585 static int omap_sham_xmit_dma(struct omap_sham_dev *dd, size_t length,
 586                               int final)
 587 {
 588         struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
 589         struct dma_async_tx_descriptor *tx;
 590         struct dma_slave_config cfg;
 591         int ret;
 592
 593         dev_dbg(dd->dev, "xmit_dma: digcnt: %d, length: %d, final: %d\n",
 594                                                 ctx->digcnt, length, final);
 595
 596         if (!dma_map_sg(dd->dev, ctx->sg, ctx->sg_len, DMA_TO_DEVICE)) {
 597                 dev_err(dd->dev, "dma_map_sg error\n");
 598                 return -EINVAL;
 599         }
 600
 601         memset(&cfg, 0, sizeof(cfg));
 602
 603         cfg.dst_addr = dd->phys_base + SHA_REG_DIN(dd, 0);
 604         cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 605         cfg.dst_maxburst = get_block_size(ctx) / DMA_SLAVE_BUSWIDTH_4_BYTES;
 606
 607         ret = dmaengine_slave_config(dd->dma_lch, &cfg);
 608         if (ret) {
 609                 pr_err("omap-sham: can't configure dmaengine slave: %d\n", ret);
 610                 return ret;
 611         }
 612
 613         tx = dmaengine_prep_slave_sg(dd->dma_lch, ctx->sg, ctx->sg_len,
 614                                      DMA_MEM_TO_DEV,
 615                                      DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 616
 617         if (!tx) {
 618                 dev_err(dd->dev, "prep_slave_sg failed\n");
 619                 return -EINVAL;
 620         }
 621
 622         tx->callback = omap_sham_dma_callback;
 623         tx->callback_param = dd;
 624
 625         dd->pdata->write_ctrl(dd, length, final, 1);
 626
 627         ctx->digcnt += length;
 628         ctx->total -= length;
 629
 630         if (final)
 631                 set_bit(FLAGS_FINAL, &dd->flags); /* catch last interrupt */
 632
 633         set_bit(FLAGS_DMA_ACTIVE, &dd->flags);
 634
 635         dmaengine_submit(tx);
 636         dma_async_issue_pending(dd->dma_lch);
 637
 638         dd->pdata->trigger(dd, length);
 639
 640         return -EINPROGRESS;
 641 }
 642
 643 static int omap_sham_copy_sg_lists(struct omap_sham_reqctx *ctx,
 644                                    struct scatterlist *sg, int bs, int new_len)
 645 {
 646         int n = sg_nents(sg);
 647         struct scatterlist *tmp;
 648         int offset = ctx->offset;
 649
 650         if (ctx->bufcnt)
 651                 n++;
 652
 653         ctx->sg = kmalloc_array(n, sizeof(*sg), GFP_KERNEL);
 654         if (!ctx->sg)
 655                 return -ENOMEM;
 656
 657         sg_init_table(ctx->sg, n);
 658
 659         tmp = ctx->sg;
 660
 661         ctx->sg_len = 0;
 662
 663         if (ctx->bufcnt) {
 664                 sg_set_buf(tmp, ctx->dd->xmit_buf, ctx->bufcnt);
 665                 tmp = sg_next(tmp);
 666                 ctx->sg_len++;
 667         }
 668
 669         while (sg && new_len) {
 670                 int len = sg->length - offset;
 671
 672                 if (offset) {
 673                         offset -= sg->length;
 674                         if (offset < 0)
 675                                 offset = 0;
 676                 }
 677
 678                 if (new_len < len)
 679                         len = new_len;
 680
 681                 if (len > 0) {
 682                         new_len -= len;
 683                         sg_set_page(tmp, sg_page(sg), len, sg->offset);
 684                         if (new_len <= 0)
 685                                 sg_mark_end(tmp);
 686                         tmp = sg_next(tmp);
 687                         ctx->sg_len++;
 688                 }
 689
 690                 sg = sg_next(sg);
 691         }
 692
 693         set_bit(FLAGS_SGS_ALLOCED, &ctx->dd->flags);
 694
 695         ctx->bufcnt = 0;
 696
 697         return 0;
 698 }
 699
 700 static int omap_sham_copy_sgs(struct omap_sham_reqctx *ctx,
 701                               struct scatterlist *sg, int bs, int new_len)
 702 {
 703         int pages;
 704         void *buf;
 705         int len;
 706
 707         len = new_len + ctx->bufcnt;
 708
 709         pages = get_order(ctx->total);
 710
 711         buf = (void *)__get_free_pages(GFP_ATOMIC, pages);
 712         if (!buf) {
 713                 pr_err("Couldn't allocate pages for unaligned cases.\n");
 714                 return -ENOMEM;
 715         }
 716
 717         if (ctx->bufcnt)
 718                 memcpy(buf, ctx->dd->xmit_buf, ctx->bufcnt);
 719
 720         scatterwalk_map_and_copy(buf + ctx->bufcnt, sg, ctx->offset,
 721                                  ctx->total - ctx->bufcnt, 0);
 722         sg_init_table(ctx->sgl, 1);
 723         sg_set_buf(ctx->sgl, buf, len);
 724         ctx->sg = ctx->sgl;
 725         set_bit(FLAGS_SGS_COPIED, &ctx->dd->flags);
 726         ctx->sg_len = 1;
 727         ctx->bufcnt = 0;
 728         ctx->offset = 0;
 729
 730         return 0;
 731 }
 732
 733 static int omap_sham_align_sgs(struct scatterlist *sg,
 734                                int nbytes, int bs, bool final,
 735                                struct omap_sham_reqctx *rctx)
 736 {
 737         int n = 0;
 738         bool aligned = true;
 739         bool list_ok = true;
 740         struct scatterlist *sg_tmp = sg;
 741         int new_len;
 742         int offset = rctx->offset;
 743
 744         if (!sg || !sg->length || !nbytes)
 745                 return 0;
 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 (nbytes != new_len)
 758                 list_ok = false;
 759
 760         while (nbytes > 0 && sg_tmp) {
 761                 n++;
 762
 763 #ifdef CONFIG_ZONE_DMA
 764                 if (page_zonenum(sg_page(sg_tmp)) != ZONE_DMA) {
 765                         aligned = false;
 766                         break;
 767                 }
 768 #endif
 769
 770                 if (offset < sg_tmp->length) {
 771                         if (!IS_ALIGNED(offset + sg_tmp->offset, 4)) {
 772                                 aligned = false;
 773                                 break;
 774                         }
 775
 776                         if (!IS_ALIGNED(sg_tmp->length - offset, bs)) {
 777                                 aligned = false;
 778                                 break;
 779                         }
 780                 }
 781
 782                 if (offset) {
 783                         offset -= sg_tmp->length;
 784                         if (offset < 0) {
 785                                 nbytes += offset;
 786                                 offset = 0;
 787                         }
 788                 } else {
 789                         nbytes -= sg_tmp->length;
 790                 }
 791
 792                 sg_tmp = sg_next(sg_tmp);
 793
 794                 if (nbytes < 0) {
 795                         list_ok = false;
 796                         break;
 797                 }
 798         }
 799
 800         if (!aligned)
 801                 return omap_sham_copy_sgs(rctx, sg, bs, new_len);
 802         else if (!list_ok)
 803                 return omap_sham_copy_sg_lists(rctx, sg, bs, new_len);
 804
 805         rctx->sg_len = n;
 806         rctx->sg = sg;
 807
 808         return 0;
 809 }
 810
 811 static int omap_sham_prepare_request(struct ahash_request *req, bool update)
 812 {
 813         struct omap_sham_reqctx *rctx = ahash_request_ctx(req);
 814         int bs;
 815         int ret;
 816         int nbytes;
 817         bool final = rctx->flags & BIT(FLAGS_FINUP);
 818         int xmit_len, hash_later;
 819
 820         bs = get_block_size(rctx);
 821
 822         if (update)
 823                 nbytes = req->nbytes;
 824         else
 825                 nbytes = 0;
 826
 827         rctx->total = nbytes + rctx->bufcnt;
 828
 829         if (!rctx->total)
 830                 return 0;
 831
 832         if (nbytes && (!IS_ALIGNED(rctx->bufcnt, bs))) {
 833                 int len = bs - rctx->bufcnt % bs;
 834
 835                 if (len > nbytes)
 836                         len = nbytes;
 837                 scatterwalk_map_and_copy(rctx->buffer + rctx->bufcnt, req->src,
 838                                          0, len, 0);
 839                 rctx->bufcnt += len;
 840                 nbytes -= len;
 841                 rctx->offset = len;
 842         }
 843
 844         if (rctx->bufcnt)
 845                 memcpy(rctx->dd->xmit_buf, rctx->buffer, rctx->bufcnt);
 846
 847         ret = omap_sham_align_sgs(req->src, nbytes, bs, final, rctx);
 848         if (ret)
 849                 return ret;
 850
 851         xmit_len = rctx->total;
 852
 853         if (!IS_ALIGNED(xmit_len, bs)) {
 854                 if (final)
 855                         xmit_len = DIV_ROUND_UP(xmit_len, bs) * bs;
 856                 else
 857                         xmit_len = xmit_len / bs * bs;
 858         } else if (!final) {
 859                 xmit_len -= bs;
 860         }
 861
 862         hash_later = rctx->total - xmit_len;
 863         if (hash_later < 0)
 864                 hash_later = 0;
 865
 866         if (rctx->bufcnt && nbytes) {
 867                 /* have data from previous operation and current */
 868                 sg_init_table(rctx->sgl, 2);
 869                 sg_set_buf(rctx->sgl, rctx->dd->xmit_buf, rctx->bufcnt);
 870
 871                 sg_chain(rctx->sgl, 2, req->src);
 872
 873                 rctx->sg = rctx->sgl;
 874
 875                 rctx->sg_len++;
 876         } else if (rctx->bufcnt) {
 877                 /* have buffered data only */
 878                 sg_init_table(rctx->sgl, 1);
 879                 sg_set_buf(rctx->sgl, rctx->dd->xmit_buf, xmit_len);
 880
 881                 rctx->sg = rctx->sgl;
 882
 883                 rctx->sg_len = 1;
 884         }
 885
 886         if (hash_later) {
 887                 int offset = 0;
 888
 889                 if (hash_later > req->nbytes) {
 890                         memcpy(rctx->buffer, rctx->buffer + xmit_len,
 891                                hash_later - req->nbytes);
 892                         offset = hash_later - req->nbytes;
 893                 }
 894
 895                 if (req->nbytes) {
 896                         scatterwalk_map_and_copy(rctx->buffer + offset,
 897                                                  req->src,
 898                                                  offset + req->nbytes -
 899                                                  hash_later, hash_later, 0);
 900                 }
 901
 902                 rctx->bufcnt = hash_later;
 903         } else {
 904                 rctx->bufcnt = 0;
 905         }
 906
 907         if (!final)
 908                 rctx->total = xmit_len;
 909
 910         return 0;
 911 }
 912
 913 static int omap_sham_update_dma_stop(struct omap_sham_dev *dd)
 914 {
 915         struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
 916
 917         dma_unmap_sg(dd->dev, ctx->sg, ctx->sg_len, DMA_TO_DEVICE);
 918
 919         clear_bit(FLAGS_DMA_ACTIVE, &dd->flags);
 920
 921         return 0;
 922 }
 923
 924 static int omap_sham_init(struct ahash_request *req)
 925 {
 926         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 927         struct omap_sham_ctx *tctx = crypto_ahash_ctx(tfm);
 928         struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
 929         struct omap_sham_dev *dd = NULL, *tmp;
 930         int bs = 0;
 931
 932         spin_lock_bh(&sham.lock);
 933         if (!tctx->dd) {
 934                 list_for_each_entry(tmp, &sham.dev_list, list) {
 935                         dd = tmp;
 936                         break;
 937                 }
 938                 tctx->dd = dd;
 939         } else {
 940                 dd = tctx->dd;
 941         }
 942         spin_unlock_bh(&sham.lock);
 943
 944         ctx->dd = dd;
 945
 946         ctx->flags = 0;
 947
 948         dev_dbg(dd->dev, "init: digest size: %d\n",
 949                 crypto_ahash_digestsize(tfm));
 950
 951         switch (crypto_ahash_digestsize(tfm)) {
 952         case MD5_DIGEST_SIZE:
 953                 ctx->flags |= FLAGS_MODE_MD5;
 954                 bs = SHA1_BLOCK_SIZE;
 955                 break;
 956         case SHA1_DIGEST_SIZE:
 957                 ctx->flags |= FLAGS_MODE_SHA1;
 958                 bs = SHA1_BLOCK_SIZE;
 959                 break;
 960         case SHA224_DIGEST_SIZE:
 961                 ctx->flags |= FLAGS_MODE_SHA224;
 962                 bs = SHA224_BLOCK_SIZE;
 963                 break;
 964         case SHA256_DIGEST_SIZE:
 965                 ctx->flags |= FLAGS_MODE_SHA256;
 966                 bs = SHA256_BLOCK_SIZE;
 967                 break;
 968         case SHA384_DIGEST_SIZE:
 969                 ctx->flags |= FLAGS_MODE_SHA384;
 970                 bs = SHA384_BLOCK_SIZE;
 971                 break;
 972         case SHA512_DIGEST_SIZE:
 973                 ctx->flags |= FLAGS_MODE_SHA512;
 974                 bs = SHA512_BLOCK_SIZE;
 975                 break;
 976         }
 977
 978         ctx->bufcnt = 0;
 979         ctx->digcnt = 0;
 980         ctx->total = 0;
 981         ctx->offset = 0;
 982         ctx->buflen = BUFLEN;
 983
 984         if (tctx->flags & BIT(FLAGS_HMAC)) {
 985                 if (!test_bit(FLAGS_AUTO_XOR, &dd->flags)) {
 986                         struct omap_sham_hmac_ctx *bctx = tctx->base;
 987
 988                         memcpy(ctx->buffer, bctx->ipad, bs);
 989                         ctx->bufcnt = bs;
 990                 }
 991
 992                 ctx->flags |= BIT(FLAGS_HMAC);
 993         }
 994
 995         return 0;
 996
 997 }
 998
 999 static int omap_sham_update_req(struct omap_sham_dev *dd)
1000 {
1001         struct ahash_request *req = dd->req;
1002         struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
1003         int err;
1004         bool final = ctx->flags & BIT(FLAGS_FINUP);
1005
1006         dev_dbg(dd->dev, "update_req: total: %u, digcnt: %d, finup: %d\n",
1007                  ctx->total, ctx->digcnt, (ctx->flags & BIT(FLAGS_FINUP)) != 0);
1008
1009         if (ctx->total < get_block_size(ctx) ||
1010             ctx->total < dd->fallback_sz)
1011                 ctx->flags |= BIT(FLAGS_CPU);
1012
1013         if (ctx->flags & BIT(FLAGS_CPU))
1014                 err = omap_sham_xmit_cpu(dd, ctx->total, final);
1015         else
1016                 err = omap_sham_xmit_dma(dd, ctx->total, final);
1017
1018         /* wait for dma completion before can take more data */
1019         dev_dbg(dd->dev, "update: err: %d, digcnt: %d\n", err, ctx->digcnt);
1020
1021         return err;
1022 }
1023
1024 static int omap_sham_final_req(struct omap_sham_dev *dd)
1025 {
1026         struct ahash_request *req = dd->req;
1027         struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
1028         int err = 0, use_dma = 1;
1029
1030         if ((ctx->total <= get_block_size(ctx)) || dd->polling_mode)
1031                 /*
1032                  * faster to handle last block with cpu or
1033                  * use cpu when dma is not present.
1034                  */
1035                 use_dma = 0;
1036
1037         if (use_dma)
1038                 err = omap_sham_xmit_dma(dd, ctx->total, 1);
1039         else
1040                 err = omap_sham_xmit_cpu(dd, ctx->total, 1);
1041
1042         ctx->bufcnt = 0;
1043
1044         dev_dbg(dd->dev, "final_req: err: %d\n", err);
1045
1046         return err;
1047 }
1048
1049 static int omap_sham_finish_hmac(struct ahash_request *req)
1050 {
1051         struct omap_sham_ctx *tctx = crypto_tfm_ctx(req->base.tfm);
1052         struct omap_sham_hmac_ctx *bctx = tctx->base;
1053         int bs = crypto_shash_blocksize(bctx->shash);
1054         int ds = crypto_shash_digestsize(bctx->shash);
1055         SHASH_DESC_ON_STACK(shash, bctx->shash);
1056
1057         shash->tfm = bctx->shash;
1058         shash->flags = 0; /* not CRYPTO_TFM_REQ_MAY_SLEEP */
1059
1060         return crypto_shash_init(shash) ?:
1061                crypto_shash_update(shash, bctx->opad, bs) ?:
1062                crypto_shash_finup(shash, req->result, ds, req->result);
1063 }
1064
1065 static int omap_sham_finish(struct ahash_request *req)
1066 {
1067         struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
1068         struct omap_sham_dev *dd = ctx->dd;
1069         int err = 0;
1070
1071         if (ctx->digcnt) {
1072                 omap_sham_copy_ready_hash(req);
1073                 if ((ctx->flags & BIT(FLAGS_HMAC)) &&
1074                                 !test_bit(FLAGS_AUTO_XOR, &dd->flags))
1075                         err = omap_sham_finish_hmac(req);
1076         }
1077
1078         dev_dbg(dd->dev, "digcnt: %d, bufcnt: %d\n", ctx->digcnt, ctx->bufcnt);
1079
1080         return err;
1081 }
1082
1083 static void omap_sham_finish_req(struct ahash_request *req, int err)
1084 {
1085         struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
1086         struct omap_sham_dev *dd = ctx->dd;
1087
1088         if (test_bit(FLAGS_SGS_COPIED, &dd->flags))
1089                 free_pages((unsigned long)sg_virt(ctx->sg),
1090                            get_order(ctx->sg->length + ctx->bufcnt));
1091
1092         if (test_bit(FLAGS_SGS_ALLOCED, &dd->flags))
1093                 kfree(ctx->sg);
1094
1095         ctx->sg = NULL;
1096
1097         dd->flags &= ~(BIT(FLAGS_SGS_ALLOCED) | BIT(FLAGS_SGS_COPIED));
1098
1099         if (!err) {
1100                 dd->pdata->copy_hash(req, 1);
1101                 if (test_bit(FLAGS_FINAL, &dd->flags))
1102                         err = omap_sham_finish(req);
1103         } else {
1104                 ctx->flags |= BIT(FLAGS_ERROR);
1105         }
1106
1107         /* atomic operation is not needed here */
1108         dd->flags &= ~(BIT(FLAGS_BUSY) | BIT(FLAGS_FINAL) | BIT(FLAGS_CPU) |
1109                         BIT(FLAGS_DMA_READY) | BIT(FLAGS_OUTPUT_READY));
1110
1111         pm_runtime_mark_last_busy(dd->dev);
1112         pm_runtime_put_autosuspend(dd->dev);
1113
1114         if (req->base.complete)
1115                 req->base.complete(&req->base, err);
1116 }
1117
1118 static int omap_sham_handle_queue(struct omap_sham_dev *dd,
1119                                   struct ahash_request *req)
1120 {
1121         struct crypto_async_request *async_req, *backlog;
1122         struct omap_sham_reqctx *ctx;
1123         unsigned long flags;
1124         int err = 0, ret = 0;
1125
1126 retry:
1127         spin_lock_irqsave(&dd->lock, flags);
1128         if (req)
1129                 ret = ahash_enqueue_request(&dd->queue, req);
1130         if (test_bit(FLAGS_BUSY, &dd->flags)) {
1131                 spin_unlock_irqrestore(&dd->lock, flags);
1132                 return ret;
1133         }
1134         backlog = crypto_get_backlog(&dd->queue);
1135         async_req = crypto_dequeue_request(&dd->queue);
1136         if (async_req)
1137                 set_bit(FLAGS_BUSY, &dd->flags);
1138         spin_unlock_irqrestore(&dd->lock, flags);
1139
1140         if (!async_req)
1141                 return ret;
1142
1143         if (backlog)
1144                 backlog->complete(backlog, -EINPROGRESS);
1145
1146         req = ahash_request_cast(async_req);
1147         dd->req = req;
1148         ctx = ahash_request_ctx(req);
1149
1150         err = omap_sham_prepare_request(req, ctx->op == OP_UPDATE);
1151         if (err || !ctx->total)
1152                 goto err1;
1153
1154         dev_dbg(dd->dev, "handling new req, op: %lu, nbytes: %d\n",
1155                                                 ctx->op, req->nbytes);
1156
1157         err = omap_sham_hw_init(dd);
1158         if (err)
1159                 goto err1;
1160
1161         if (ctx->digcnt)
1162                 /* request has changed - restore hash */
1163                 dd->pdata->copy_hash(req, 0);
1164
1165         if (ctx->op == OP_UPDATE) {
1166                 err = omap_sham_update_req(dd);
1167                 if (err != -EINPROGRESS && (ctx->flags & BIT(FLAGS_FINUP)))
1168                         /* no final() after finup() */
1169                         err = omap_sham_final_req(dd);
1170         } else if (ctx->op == OP_FINAL) {
1171                 err = omap_sham_final_req(dd);
1172         }
1173 err1:
1174         dev_dbg(dd->dev, "exit, err: %d\n", err);
1175
1176         if (err != -EINPROGRESS) {
1177                 /* done_task will not finish it, so do it here */
1178                 omap_sham_finish_req(req, err);
1179                 req = NULL;
1180
1181                 /*
1182                  * Execute next request immediately if there is anything
1183                  * in queue.
1184                  */
1185                 goto retry;
1186         }
1187
1188         return ret;
1189 }
1190
1191 static int omap_sham_enqueue(struct ahash_request *req, unsigned int op)
1192 {
1193         struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
1194         struct omap_sham_ctx *tctx = crypto_tfm_ctx(req->base.tfm);
1195         struct omap_sham_dev *dd = tctx->dd;
1196
1197         ctx->op = op;
1198
1199         return omap_sham_handle_queue(dd, req);
1200 }
1201
1202 static int omap_sham_update(struct ahash_request *req)
1203 {
1204         struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
1205         struct omap_sham_dev *dd = ctx->dd;
1206
1207         if (!req->nbytes)
1208                 return 0;
1209
1210         if (ctx->bufcnt + req->nbytes <= ctx->buflen) {
1211                 scatterwalk_map_and_copy(ctx->buffer + ctx->bufcnt, req->src,
1212                                          0, req->nbytes, 0);
1213                 ctx->bufcnt += req->nbytes;
1214                 return 0;
1215         }
1216
1217         if (dd->polling_mode)
1218                 ctx->flags |= BIT(FLAGS_CPU);
1219
1220         return omap_sham_enqueue(req, OP_UPDATE);
1221 }
1222
1223 static int omap_sham_shash_digest(struct crypto_shash *tfm, u32 flags,
1224                                   const u8 *data, unsigned int len, u8 *out)
1225 {
1226         SHASH_DESC_ON_STACK(shash, tfm);
1227
1228         shash->tfm = tfm;
1229         shash->flags = flags & CRYPTO_TFM_REQ_MAY_SLEEP;
1230
1231         return crypto_shash_digest(shash, data, len, out);
1232 }
1233
1234 static int omap_sham_final_shash(struct ahash_request *req)
1235 {
1236         struct omap_sham_ctx *tctx = crypto_tfm_ctx(req->base.tfm);
1237         struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
1238         int offset = 0;
1239
1240         /*
1241          * If we are running HMAC on limited hardware support, skip
1242          * the ipad in the beginning of the buffer if we are going for
1243          * software fallback algorithm.
1244          */
1245         if (test_bit(FLAGS_HMAC, &ctx->flags) &&
1246             !test_bit(FLAGS_AUTO_XOR, &ctx->dd->flags))
1247                 offset = get_block_size(ctx);
1248
1249         return omap_sham_shash_digest(tctx->fallback, req->base.flags,
1250                                       ctx->buffer + offset,
1251                                       ctx->bufcnt - offset, req->result);
1252 }
1253
1254 static int omap_sham_final(struct ahash_request *req)
1255 {
1256         struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
1257
1258         ctx->flags |= BIT(FLAGS_FINUP);
1259
1260         if (ctx->flags & BIT(FLAGS_ERROR))
1261                 return 0; /* uncompleted hash is not needed */
1262
1263         /*
1264          * OMAP HW accel works only with buffers >= 9.
1265          * HMAC is always >= 9 because ipad == block size.
1266          * If buffersize is less than fallback_sz, we use fallback
1267          * SW encoding, as using DMA + HW in this case doesn't provide
1268          * any benefit.
1269          */
1270         if (!ctx->digcnt && ctx->bufcnt < ctx->dd->fallback_sz)
1271                 return omap_sham_final_shash(req);
1272         else if (ctx->bufcnt)
1273                 return omap_sham_enqueue(req, OP_FINAL);
1274
1275         /* copy ready hash (+ finalize hmac) */
1276         return omap_sham_finish(req);
1277 }
1278
1279 static int omap_sham_finup(struct ahash_request *req)
1280 {
1281         struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
1282         int err1, err2;
1283
1284         ctx->flags |= BIT(FLAGS_FINUP);
1285
1286         err1 = omap_sham_update(req);
1287         if (err1 == -EINPROGRESS || err1 == -EBUSY)
1288                 return err1;
1289         /*
1290          * final() has to be always called to cleanup resources
1291          * even if udpate() failed, except EINPROGRESS
1292          */
1293         err2 = omap_sham_final(req);
1294
1295         return err1 ?: err2;
1296 }
1297
1298 static int omap_sham_digest(struct ahash_request *req)
1299 {
1300         return omap_sham_init(req) ?: omap_sham_finup(req);
1301 }
1302
1303 static int omap_sham_setkey(struct crypto_ahash *tfm, const u8 *key,
1304                       unsigned int keylen)
1305 {
1306         struct omap_sham_ctx *tctx = crypto_ahash_ctx(tfm);
1307         struct omap_sham_hmac_ctx *bctx = tctx->base;
1308         int bs = crypto_shash_blocksize(bctx->shash);
1309         int ds = crypto_shash_digestsize(bctx->shash);
1310         struct omap_sham_dev *dd = NULL, *tmp;
1311         int err, i;
1312
1313         spin_lock_bh(&sham.lock);
1314         if (!tctx->dd) {
1315                 list_for_each_entry(tmp, &sham.dev_list, list) {
1316                         dd = tmp;
1317                         break;
1318                 }
1319                 tctx->dd = dd;
1320         } else {
1321                 dd = tctx->dd;
1322         }
1323         spin_unlock_bh(&sham.lock);
1324
1325         err = crypto_shash_setkey(tctx->fallback, key, keylen);
1326         if (err)
1327                 return err;
1328
1329         if (keylen > bs) {
1330                 err = omap_sham_shash_digest(bctx->shash,
1331                                 crypto_shash_get_flags(bctx->shash),
1332                                 key, keylen, bctx->ipad);
1333                 if (err)
1334                         return err;
1335                 keylen = ds;
1336         } else {
1337                 memcpy(bctx->ipad, key, keylen);
1338         }
1339
1340         memset(bctx->ipad + keylen, 0, bs - keylen);
1341
1342         if (!test_bit(FLAGS_AUTO_XOR, &dd->flags)) {
1343                 memcpy(bctx->opad, bctx->ipad, bs);
1344
1345                 for (i = 0; i < bs; i++) {
1346                         bctx->ipad[i] ^= HMAC_IPAD_VALUE;
1347                         bctx->opad[i] ^= HMAC_OPAD_VALUE;
1348                 }
1349         }
1350
1351         return err;
1352 }
1353
1354 static int omap_sham_cra_init_alg(struct crypto_tfm *tfm, const char *alg_base)
1355 {
1356         struct omap_sham_ctx *tctx = crypto_tfm_ctx(tfm);
1357         const char *alg_name = crypto_tfm_alg_name(tfm);
1358
1359         /* Allocate a fallback and abort if it failed. */
1360         tctx->fallback = crypto_alloc_shash(alg_name, 0,
1361                                             CRYPTO_ALG_NEED_FALLBACK);
1362         if (IS_ERR(tctx->fallback)) {
1363                 pr_err("omap-sham: fallback driver '%s' "
1364                                 "could not be loaded.\n", alg_name);
1365                 return PTR_ERR(tctx->fallback);
1366         }
1367
1368         crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
1369                                  sizeof(struct omap_sham_reqctx) + BUFLEN);
1370
1371         if (alg_base) {
1372                 struct omap_sham_hmac_ctx *bctx = tctx->base;
1373                 tctx->flags |= BIT(FLAGS_HMAC);
1374                 bctx->shash = crypto_alloc_shash(alg_base, 0,
1375                                                 CRYPTO_ALG_NEED_FALLBACK);
1376                 if (IS_ERR(bctx->shash)) {
1377                         pr_err("omap-sham: base driver '%s' "
1378                                         "could not be loaded.\n", alg_base);
1379                         crypto_free_shash(tctx->fallback);
1380                         return PTR_ERR(bctx->shash);
1381                 }
1382
1383         }
1384
1385         return 0;
1386 }
1387
1388 static int omap_sham_cra_init(struct crypto_tfm *tfm)
1389 {
1390         return omap_sham_cra_init_alg(tfm, NULL);
1391 }
1392
1393 static int omap_sham_cra_sha1_init(struct crypto_tfm *tfm)
1394 {
1395         return omap_sham_cra_init_alg(tfm, "sha1");
1396 }
1397
1398 static int omap_sham_cra_sha224_init(struct crypto_tfm *tfm)
1399 {
1400         return omap_sham_cra_init_alg(tfm, "sha224");
1401 }
1402
1403 static int omap_sham_cra_sha256_init(struct crypto_tfm *tfm)
1404 {
1405         return omap_sham_cra_init_alg(tfm, "sha256");
1406 }
1407
1408 static int omap_sham_cra_md5_init(struct crypto_tfm *tfm)
1409 {
1410         return omap_sham_cra_init_alg(tfm, "md5");
1411 }
1412
1413 static int omap_sham_cra_sha384_init(struct crypto_tfm *tfm)
1414 {
1415         return omap_sham_cra_init_alg(tfm, "sha384");
1416 }
1417
1418 static int omap_sham_cra_sha512_init(struct crypto_tfm *tfm)
1419 {
1420         return omap_sham_cra_init_alg(tfm, "sha512");
1421 }
1422
1423 static void omap_sham_cra_exit(struct crypto_tfm *tfm)
1424 {
1425         struct omap_sham_ctx *tctx = crypto_tfm_ctx(tfm);
1426
1427         crypto_free_shash(tctx->fallback);
1428         tctx->fallback = NULL;
1429
1430         if (tctx->flags & BIT(FLAGS_HMAC)) {
1431                 struct omap_sham_hmac_ctx *bctx = tctx->base;
1432                 crypto_free_shash(bctx->shash);
1433         }
1434 }
1435
1436 static int omap_sham_export(struct ahash_request *req, void *out)
1437 {
1438         struct omap_sham_reqctx *rctx = ahash_request_ctx(req);
1439
1440         memcpy(out, rctx, sizeof(*rctx) + rctx->bufcnt);
1441
1442         return 0;
1443 }
1444
1445 static int omap_sham_import(struct ahash_request *req, const void *in)
1446 {
1447         struct omap_sham_reqctx *rctx = ahash_request_ctx(req);
1448         const struct omap_sham_reqctx *ctx_in = in;
1449
1450         memcpy(rctx, in, sizeof(*rctx) + ctx_in->bufcnt);
1451
1452         return 0;
1453 }
1454
1455 static struct ahash_alg algs_sha1_md5[] = {
1456 {
1457         .init           = omap_sham_init,
1458         .update         = omap_sham_update,
1459         .final          = omap_sham_final,
1460         .finup          = omap_sham_finup,
1461         .digest         = omap_sham_digest,
1462         .halg.digestsize        = SHA1_DIGEST_SIZE,
1463         .halg.base      = {
1464                 .cra_name               = "sha1",
1465                 .cra_driver_name        = "omap-sha1",
1466                 .cra_priority           = 400,
1467                 .cra_flags              = CRYPTO_ALG_KERN_DRIVER_ONLY |
1468                                                 CRYPTO_ALG_ASYNC |
1469                                                 CRYPTO_ALG_NEED_FALLBACK,
1470                 .cra_blocksize          = SHA1_BLOCK_SIZE,
1471                 .cra_ctxsize            = sizeof(struct omap_sham_ctx),
1472                 .cra_alignmask          = OMAP_ALIGN_MASK,
1473                 .cra_module             = THIS_MODULE,
1474                 .cra_init               = omap_sham_cra_init,
1475                 .cra_exit               = omap_sham_cra_exit,
1476         }
1477 },
1478 {
1479         .init           = omap_sham_init,
1480         .update         = omap_sham_update,
1481         .final          = omap_sham_final,
1482         .finup          = omap_sham_finup,
1483         .digest         = omap_sham_digest,
1484         .halg.digestsize        = MD5_DIGEST_SIZE,
1485         .halg.base      = {
1486                 .cra_name               = "md5",
1487                 .cra_driver_name        = "omap-md5",
1488                 .cra_priority           = 400,
1489                 .cra_flags              = CRYPTO_ALG_KERN_DRIVER_ONLY |
1490                                                 CRYPTO_ALG_ASYNC |
1491                                                 CRYPTO_ALG_NEED_FALLBACK,
1492                 .cra_blocksize          = SHA1_BLOCK_SIZE,
1493                 .cra_ctxsize            = sizeof(struct omap_sham_ctx),
1494                 .cra_alignmask          = OMAP_ALIGN_MASK,
1495                 .cra_module             = THIS_MODULE,
1496                 .cra_init               = omap_sham_cra_init,
1497                 .cra_exit               = omap_sham_cra_exit,
1498         }
1499 },
1500 {
1501         .init           = omap_sham_init,
1502         .update         = omap_sham_update,
1503         .final          = omap_sham_final,
1504         .finup          = omap_sham_finup,
1505         .digest         = omap_sham_digest,
1506         .setkey         = omap_sham_setkey,
1507         .halg.digestsize        = SHA1_DIGEST_SIZE,
1508         .halg.base      = {
1509                 .cra_name               = "hmac(sha1)",
1510                 .cra_driver_name        = "omap-hmac-sha1",
1511                 .cra_priority           = 400,
1512                 .cra_flags              = CRYPTO_ALG_KERN_DRIVER_ONLY |
1513                                                 CRYPTO_ALG_ASYNC |
1514                                                 CRYPTO_ALG_NEED_FALLBACK,
1515                 .cra_blocksize          = SHA1_BLOCK_SIZE,
1516                 .cra_ctxsize            = sizeof(struct omap_sham_ctx) +
1517                                         sizeof(struct omap_sham_hmac_ctx),
1518                 .cra_alignmask          = OMAP_ALIGN_MASK,
1519                 .cra_module             = THIS_MODULE,
1520                 .cra_init               = omap_sham_cra_sha1_init,
1521                 .cra_exit               = omap_sham_cra_exit,
1522         }
1523 },
1524 {
1525         .init           = omap_sham_init,
1526         .update         = omap_sham_update,
1527         .final          = omap_sham_final,
1528         .finup          = omap_sham_finup,
1529         .digest         = omap_sham_digest,
1530         .setkey         = omap_sham_setkey,
1531         .halg.digestsize        = MD5_DIGEST_SIZE,
1532         .halg.base      = {
1533                 .cra_name               = "hmac(md5)",
1534                 .cra_driver_name        = "omap-hmac-md5",
1535                 .cra_priority           = 400,
1536                 .cra_flags              = CRYPTO_ALG_KERN_DRIVER_ONLY |
1537                                                 CRYPTO_ALG_ASYNC |
1538                                                 CRYPTO_ALG_NEED_FALLBACK,
1539                 .cra_blocksize          = SHA1_BLOCK_SIZE,
1540                 .cra_ctxsize            = sizeof(struct omap_sham_ctx) +
1541                                         sizeof(struct omap_sham_hmac_ctx),
1542                 .cra_alignmask          = OMAP_ALIGN_MASK,
1543                 .cra_module             = THIS_MODULE,
1544                 .cra_init               = omap_sham_cra_md5_init,
1545                 .cra_exit               = omap_sham_cra_exit,
1546         }
1547 }
1548 };
1549
1550 /* OMAP4 has some algs in addition to what OMAP2 has */
1551 static struct ahash_alg algs_sha224_sha256[] = {
1552 {
1553         .init           = omap_sham_init,
1554         .update         = omap_sham_update,
1555         .final          = omap_sham_final,
1556         .finup          = omap_sham_finup,
1557         .digest         = omap_sham_digest,
1558         .halg.digestsize        = SHA224_DIGEST_SIZE,
1559         .halg.base      = {
1560                 .cra_name               = "sha224",
1561                 .cra_driver_name        = "omap-sha224",
1562                 .cra_priority           = 400,
1563                 .cra_flags              = CRYPTO_ALG_ASYNC |
1564                                                 CRYPTO_ALG_NEED_FALLBACK,
1565                 .cra_blocksize          = SHA224_BLOCK_SIZE,
1566                 .cra_ctxsize            = sizeof(struct omap_sham_ctx),
1567                 .cra_alignmask          = OMAP_ALIGN_MASK,
1568                 .cra_module             = THIS_MODULE,
1569                 .cra_init               = omap_sham_cra_init,
1570                 .cra_exit               = omap_sham_cra_exit,
1571         }
1572 },
1573 {
1574         .init           = omap_sham_init,
1575         .update         = omap_sham_update,
1576         .final          = omap_sham_final,
1577         .finup          = omap_sham_finup,
1578         .digest         = omap_sham_digest,
1579         .halg.digestsize        = SHA256_DIGEST_SIZE,
1580         .halg.base      = {
1581                 .cra_name               = "sha256",
1582                 .cra_driver_name        = "omap-sha256",
1583                 .cra_priority           = 400,
1584                 .cra_flags              = CRYPTO_ALG_ASYNC |
1585                                                 CRYPTO_ALG_NEED_FALLBACK,
1586                 .cra_blocksize          = SHA256_BLOCK_SIZE,
1587                 .cra_ctxsize            = sizeof(struct omap_sham_ctx),
1588                 .cra_alignmask          = OMAP_ALIGN_MASK,
1589                 .cra_module             = THIS_MODULE,
1590                 .cra_init               = omap_sham_cra_init,
1591                 .cra_exit               = omap_sham_cra_exit,
1592         }
1593 },
1594 {
1595         .init           = omap_sham_init,
1596         .update         = omap_sham_update,
1597         .final          = omap_sham_final,
1598         .finup          = omap_sham_finup,
1599         .digest         = omap_sham_digest,
1600         .setkey         = omap_sham_setkey,
1601         .halg.digestsize        = SHA224_DIGEST_SIZE,
1602         .halg.base      = {
1603                 .cra_name               = "hmac(sha224)",
1604                 .cra_driver_name        = "omap-hmac-sha224",
1605                 .cra_priority           = 400,
1606                 .cra_flags              = CRYPTO_ALG_ASYNC |
1607                                                 CRYPTO_ALG_NEED_FALLBACK,
1608                 .cra_blocksize          = SHA224_BLOCK_SIZE,
1609                 .cra_ctxsize            = sizeof(struct omap_sham_ctx) +
1610                                         sizeof(struct omap_sham_hmac_ctx),
1611                 .cra_alignmask          = OMAP_ALIGN_MASK,
1612                 .cra_module             = THIS_MODULE,
1613                 .cra_init               = omap_sham_cra_sha224_init,
1614                 .cra_exit               = omap_sham_cra_exit,
1615         }
1616 },
1617 {
1618         .init           = omap_sham_init,
1619         .update         = omap_sham_update,
1620         .final          = omap_sham_final,
1621         .finup          = omap_sham_finup,
1622         .digest         = omap_sham_digest,
1623         .setkey         = omap_sham_setkey,
1624         .halg.digestsize        = SHA256_DIGEST_SIZE,
1625         .halg.base      = {
1626                 .cra_name               = "hmac(sha256)",
1627                 .cra_driver_name        = "omap-hmac-sha256",
1628                 .cra_priority           = 400,
1629                 .cra_flags              = CRYPTO_ALG_ASYNC |
1630                                                 CRYPTO_ALG_NEED_FALLBACK,
1631                 .cra_blocksize          = SHA256_BLOCK_SIZE,
1632                 .cra_ctxsize            = sizeof(struct omap_sham_ctx) +
1633                                         sizeof(struct omap_sham_hmac_ctx),
1634                 .cra_alignmask          = OMAP_ALIGN_MASK,
1635                 .cra_module             = THIS_MODULE,
1636                 .cra_init               = omap_sham_cra_sha256_init,
1637                 .cra_exit               = omap_sham_cra_exit,
1638         }
1639 },
1640 };
1641
1642 static struct ahash_alg algs_sha384_sha512[] = {
1643 {
1644         .init           = omap_sham_init,
1645         .update         = omap_sham_update,
1646         .final          = omap_sham_final,
1647         .finup          = omap_sham_finup,
1648         .digest         = omap_sham_digest,
1649         .halg.digestsize        = SHA384_DIGEST_SIZE,
1650         .halg.base      = {
1651                 .cra_name               = "sha384",
1652                 .cra_driver_name        = "omap-sha384",
1653                 .cra_priority           = 400,
1654                 .cra_flags              = CRYPTO_ALG_ASYNC |
1655                                                 CRYPTO_ALG_NEED_FALLBACK,
1656                 .cra_blocksize          = SHA384_BLOCK_SIZE,
1657                 .cra_ctxsize            = sizeof(struct omap_sham_ctx),
1658                 .cra_alignmask          = OMAP_ALIGN_MASK,
1659                 .cra_module             = THIS_MODULE,
1660                 .cra_init               = omap_sham_cra_init,
1661                 .cra_exit               = omap_sham_cra_exit,
1662         }
1663 },
1664 {
1665         .init           = omap_sham_init,
1666         .update         = omap_sham_update,
1667         .final          = omap_sham_final,
1668         .finup          = omap_sham_finup,
1669         .digest         = omap_sham_digest,
1670         .halg.digestsize        = SHA512_DIGEST_SIZE,
1671         .halg.base      = {
1672                 .cra_name               = "sha512",
1673                 .cra_driver_name        = "omap-sha512",
1674                 .cra_priority           = 400,
1675                 .cra_flags              = CRYPTO_ALG_ASYNC |
1676                                                 CRYPTO_ALG_NEED_FALLBACK,
1677                 .cra_blocksize          = SHA512_BLOCK_SIZE,
1678                 .cra_ctxsize            = sizeof(struct omap_sham_ctx),
1679                 .cra_alignmask          = OMAP_ALIGN_MASK,
1680                 .cra_module             = THIS_MODULE,
1681                 .cra_init               = omap_sham_cra_init,
1682                 .cra_exit               = omap_sham_cra_exit,
1683         }
1684 },
1685 {
1686         .init           = omap_sham_init,
1687         .update         = omap_sham_update,
1688         .final          = omap_sham_final,
1689         .finup          = omap_sham_finup,
1690         .digest         = omap_sham_digest,
1691         .setkey         = omap_sham_setkey,
1692         .halg.digestsize        = SHA384_DIGEST_SIZE,
1693         .halg.base      = {
1694                 .cra_name               = "hmac(sha384)",
1695                 .cra_driver_name        = "omap-hmac-sha384",
1696                 .cra_priority           = 400,
1697                 .cra_flags              = CRYPTO_ALG_ASYNC |
1698                                                 CRYPTO_ALG_NEED_FALLBACK,
1699                 .cra_blocksize          = SHA384_BLOCK_SIZE,
1700                 .cra_ctxsize            = sizeof(struct omap_sham_ctx) +
1701                                         sizeof(struct omap_sham_hmac_ctx),
1702                 .cra_alignmask          = OMAP_ALIGN_MASK,
1703                 .cra_module             = THIS_MODULE,
1704                 .cra_init               = omap_sham_cra_sha384_init,
1705                 .cra_exit               = omap_sham_cra_exit,
1706         }
1707 },
1708 {
1709         .init           = omap_sham_init,
1710         .update         = omap_sham_update,
1711         .final          = omap_sham_final,
1712         .finup          = omap_sham_finup,
1713         .digest         = omap_sham_digest,
1714         .setkey         = omap_sham_setkey,
1715         .halg.digestsize        = SHA512_DIGEST_SIZE,
1716         .halg.base      = {
1717                 .cra_name               = "hmac(sha512)",
1718                 .cra_driver_name        = "omap-hmac-sha512",
1719                 .cra_priority           = 400,
1720                 .cra_flags              = CRYPTO_ALG_ASYNC |
1721                                                 CRYPTO_ALG_NEED_FALLBACK,
1722                 .cra_blocksize          = SHA512_BLOCK_SIZE,
1723                 .cra_ctxsize            = sizeof(struct omap_sham_ctx) +
1724                                         sizeof(struct omap_sham_hmac_ctx),
1725                 .cra_alignmask          = OMAP_ALIGN_MASK,
1726                 .cra_module             = THIS_MODULE,
1727                 .cra_init               = omap_sham_cra_sha512_init,
1728                 .cra_exit               = omap_sham_cra_exit,
1729         }
1730 },
1731 };
1732
1733 static void omap_sham_done_task(unsigned long data)
1734 {
1735         struct omap_sham_dev *dd = (struct omap_sham_dev *)data;
1736         int err = 0;
1737
1738         if (!test_bit(FLAGS_BUSY, &dd->flags)) {
1739                 omap_sham_handle_queue(dd, NULL);
1740                 return;
1741         }
1742
1743         if (test_bit(FLAGS_CPU, &dd->flags)) {
1744                 if (test_and_clear_bit(FLAGS_OUTPUT_READY, &dd->flags))
1745                         goto finish;
1746         } else if (test_bit(FLAGS_DMA_READY, &dd->flags)) {
1747                 if (test_and_clear_bit(FLAGS_DMA_ACTIVE, &dd->flags)) {
1748                         omap_sham_update_dma_stop(dd);
1749                         if (dd->err) {
1750                                 err = dd->err;
1751                                 goto finish;
1752                         }
1753                 }
1754                 if (test_and_clear_bit(FLAGS_OUTPUT_READY, &dd->flags)) {
1755                         /* hash or semi-hash ready */
1756                         clear_bit(FLAGS_DMA_READY, &dd->flags);
1757                         goto finish;
1758                 }
1759         }
1760
1761         return;
1762
1763 finish:
1764         dev_dbg(dd->dev, "update done: err: %d\n", err);
1765         /* finish curent request */
1766         omap_sham_finish_req(dd->req, err);
1767
1768         /* If we are not busy, process next req */
1769         if (!test_bit(FLAGS_BUSY, &dd->flags))
1770                 omap_sham_handle_queue(dd, NULL);
1771 }
1772
1773 static irqreturn_t omap_sham_irq_common(struct omap_sham_dev *dd)
1774 {
1775         if (!test_bit(FLAGS_BUSY, &dd->flags)) {
1776                 dev_warn(dd->dev, "Interrupt when no active requests.\n");
1777         } else {
1778                 set_bit(FLAGS_OUTPUT_READY, &dd->flags);
1779                 tasklet_schedule(&dd->done_task);
1780         }
1781
1782         return IRQ_HANDLED;
1783 }
1784
1785 static irqreturn_t omap_sham_irq_omap2(int irq, void *dev_id)
1786 {
1787         struct omap_sham_dev *dd = dev_id;
1788
1789         if (unlikely(test_bit(FLAGS_FINAL, &dd->flags)))
1790                 /* final -> allow device to go to power-saving mode */
1791                 omap_sham_write_mask(dd, SHA_REG_CTRL, 0, SHA_REG_CTRL_LENGTH);
1792
1793         omap_sham_write_mask(dd, SHA_REG_CTRL, SHA_REG_CTRL_OUTPUT_READY,
1794                                  SHA_REG_CTRL_OUTPUT_READY);
1795         omap_sham_read(dd, SHA_REG_CTRL);
1796
1797         return omap_sham_irq_common(dd);
1798 }
1799
1800 static irqreturn_t omap_sham_irq_omap4(int irq, void *dev_id)
1801 {
1802         struct omap_sham_dev *dd = dev_id;
1803
1804         omap_sham_write_mask(dd, SHA_REG_MASK(dd), 0, SHA_REG_MASK_IT_EN);
1805
1806         return omap_sham_irq_common(dd);
1807 }
1808
1809 static struct omap_sham_algs_info omap_sham_algs_info_omap2[] = {
1810         {
1811                 .algs_list      = algs_sha1_md5,
1812                 .size           = ARRAY_SIZE(algs_sha1_md5),
1813         },
1814 };
1815
1816 static const struct omap_sham_pdata omap_sham_pdata_omap2 = {
1817         .algs_info      = omap_sham_algs_info_omap2,
1818         .algs_info_size = ARRAY_SIZE(omap_sham_algs_info_omap2),
1819         .flags          = BIT(FLAGS_BE32_SHA1),
1820         .digest_size    = SHA1_DIGEST_SIZE,
1821         .copy_hash      = omap_sham_copy_hash_omap2,
1822         .write_ctrl     = omap_sham_write_ctrl_omap2,
1823         .trigger        = omap_sham_trigger_omap2,
1824         .poll_irq       = omap_sham_poll_irq_omap2,
1825         .intr_hdlr      = omap_sham_irq_omap2,
1826         .idigest_ofs    = 0x00,
1827         .din_ofs        = 0x1c,
1828         .digcnt_ofs     = 0x14,
1829         .rev_ofs        = 0x5c,
1830         .mask_ofs       = 0x60,
1831         .sysstatus_ofs  = 0x64,
1832         .major_mask     = 0xf0,
1833         .major_shift    = 4,
1834         .minor_mask     = 0x0f,
1835         .minor_shift    = 0,
1836 };
1837
1838 #ifdef CONFIG_OF
1839 static struct omap_sham_algs_info omap_sham_algs_info_omap4[] = {
1840         {
1841                 .algs_list      = algs_sha1_md5,
1842                 .size           = ARRAY_SIZE(algs_sha1_md5),
1843         },
1844         {
1845                 .algs_list      = algs_sha224_sha256,
1846                 .size           = ARRAY_SIZE(algs_sha224_sha256),
1847         },
1848 };
1849
1850 static const struct omap_sham_pdata omap_sham_pdata_omap4 = {
1851         .algs_info      = omap_sham_algs_info_omap4,
1852         .algs_info_size = ARRAY_SIZE(omap_sham_algs_info_omap4),
1853         .flags          = BIT(FLAGS_AUTO_XOR),
1854         .digest_size    = SHA256_DIGEST_SIZE,
1855         .copy_hash      = omap_sham_copy_hash_omap4,
1856         .write_ctrl     = omap_sham_write_ctrl_omap4,
1857         .trigger        = omap_sham_trigger_omap4,
1858         .poll_irq       = omap_sham_poll_irq_omap4,
1859         .intr_hdlr      = omap_sham_irq_omap4,
1860         .idigest_ofs    = 0x020,
1861         .odigest_ofs    = 0x0,
1862         .din_ofs        = 0x080,
1863         .digcnt_ofs     = 0x040,
1864         .rev_ofs        = 0x100,
1865         .mask_ofs       = 0x110,
1866         .sysstatus_ofs  = 0x114,
1867         .mode_ofs       = 0x44,
1868         .length_ofs     = 0x48,
1869         .major_mask     = 0x0700,
1870         .major_shift    = 8,
1871         .minor_mask     = 0x003f,
1872         .minor_shift    = 0,
1873 };
1874
1875 static struct omap_sham_algs_info omap_sham_algs_info_omap5[] = {
1876         {
1877                 .algs_list      = algs_sha1_md5,
1878                 .size           = ARRAY_SIZE(algs_sha1_md5),
1879         },
1880         {
1881                 .algs_list      = algs_sha224_sha256,
1882                 .size           = ARRAY_SIZE(algs_sha224_sha256),
1883         },
1884         {
1885                 .algs_list      = algs_sha384_sha512,
1886                 .size           = ARRAY_SIZE(algs_sha384_sha512),
1887         },
1888 };
1889
1890 static const struct omap_sham_pdata omap_sham_pdata_omap5 = {
1891         .algs_info      = omap_sham_algs_info_omap5,
1892         .algs_info_size = ARRAY_SIZE(omap_sham_algs_info_omap5),
1893         .flags          = BIT(FLAGS_AUTO_XOR),
1894         .digest_size    = SHA512_DIGEST_SIZE,
1895         .copy_hash      = omap_sham_copy_hash_omap4,
1896         .write_ctrl     = omap_sham_write_ctrl_omap4,
1897         .trigger        = omap_sham_trigger_omap4,
1898         .poll_irq       = omap_sham_poll_irq_omap4,
1899         .intr_hdlr      = omap_sham_irq_omap4,
1900         .idigest_ofs    = 0x240,
1901         .odigest_ofs    = 0x200,
1902         .din_ofs        = 0x080,
1903         .digcnt_ofs     = 0x280,
1904         .rev_ofs        = 0x100,
1905         .mask_ofs       = 0x110,
1906         .sysstatus_ofs  = 0x114,
1907         .mode_ofs       = 0x284,
1908         .length_ofs     = 0x288,
1909         .major_mask     = 0x0700,
1910         .major_shift    = 8,
1911         .minor_mask     = 0x003f,
1912         .minor_shift    = 0,
1913 };
1914
1915 static const struct of_device_id omap_sham_of_match[] = {
1916         {
1917                 .compatible     = "ti,omap2-sham",
1918                 .data           = &omap_sham_pdata_omap2,
1919         },
1920         {
1921                 .compatible     = "ti,omap3-sham",
1922                 .data           = &omap_sham_pdata_omap2,
1923         },
1924         {
1925                 .compatible     = "ti,omap4-sham",
1926                 .data           = &omap_sham_pdata_omap4,
1927         },
1928         {
1929                 .compatible     = "ti,omap5-sham",
1930                 .data           = &omap_sham_pdata_omap5,
1931         },
1932         {},
1933 };
1934 MODULE_DEVICE_TABLE(of, omap_sham_of_match);
1935
1936 static int omap_sham_get_res_of(struct omap_sham_dev *dd,
1937                 struct device *dev, struct resource *res)
1938 {
1939         struct device_node *node = dev->of_node;
1940         int err = 0;
1941
1942         dd->pdata = of_device_get_match_data(dev);
1943         if (!dd->pdata) {
1944                 dev_err(dev, "no compatible OF match\n");
1945                 err = -EINVAL;
1946                 goto err;
1947         }
1948
1949         err = of_address_to_resource(node, 0, res);
1950         if (err < 0) {
1951                 dev_err(dev, "can't translate OF node address\n");
1952                 err = -EINVAL;
1953                 goto err;
1954         }
1955
1956         dd->irq = irq_of_parse_and_map(node, 0);
1957         if (!dd->irq) {
1958                 dev_err(dev, "can't translate OF irq value\n");
1959                 err = -EINVAL;
1960                 goto err;
1961         }
1962
1963 err:
1964         return err;
1965 }
1966 #else
1967 static const struct of_device_id omap_sham_of_match[] = {
1968         {},
1969 };
1970
1971 static int omap_sham_get_res_of(struct omap_sham_dev *dd,
1972                 struct device *dev, struct resource *res)
1973 {
1974         return -EINVAL;
1975 }
1976 #endif
1977
1978 static int omap_sham_get_res_pdev(struct omap_sham_dev *dd,
1979                 struct platform_device *pdev, struct resource *res)
1980 {
1981         struct device *dev = &pdev->dev;
1982         struct resource *r;
1983         int err = 0;
1984
1985         /* Get the base address */
1986         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1987         if (!r) {
1988                 dev_err(dev, "no MEM resource info\n");
1989                 err = -ENODEV;
1990                 goto err;
1991         }
1992         memcpy(res, r, sizeof(*res));
1993
1994         /* Get the IRQ */
1995         dd->irq = platform_get_irq(pdev, 0);
1996         if (dd->irq < 0) {
1997                 dev_err(dev, "no IRQ resource info\n");
1998                 err = dd->irq;
1999                 goto err;
2000         }
2001
2002         /* Only OMAP2/3 can be non-DT */
2003         dd->pdata = &omap_sham_pdata_omap2;
2004
2005 err:
2006         return err;
2007 }
2008
2009 static ssize_t fallback_show(struct device *dev, struct device_attribute *attr,
2010                              char *buf)
2011 {
2012         struct omap_sham_dev *dd = dev_get_drvdata(dev);
2013
2014         return sprintf(buf, "%d\n", dd->fallback_sz);
2015 }
2016
2017 static ssize_t fallback_store(struct device *dev, struct device_attribute *attr,
2018                               const char *buf, size_t size)
2019 {
2020         struct omap_sham_dev *dd = dev_get_drvdata(dev);
2021         ssize_t status;
2022         long value;
2023
2024         status = kstrtol(buf, 0, &value);
2025         if (status)
2026                 return status;
2027
2028         /* HW accelerator only works with buffers > 9 */
2029         if (value < 9) {
2030                 dev_err(dev, "minimum fallback size 9\n");
2031                 return -EINVAL;
2032         }
2033
2034         dd->fallback_sz = value;
2035
2036         return size;
2037 }
2038
2039 static ssize_t queue_len_show(struct device *dev, struct device_attribute *attr,
2040                               char *buf)
2041 {
2042         struct omap_sham_dev *dd = dev_get_drvdata(dev);
2043
2044         return sprintf(buf, "%d\n", dd->queue.max_qlen);
2045 }
2046
2047 static ssize_t queue_len_store(struct device *dev,
2048                                struct device_attribute *attr, const char *buf,
2049                                size_t size)
2050 {
2051         struct omap_sham_dev *dd = dev_get_drvdata(dev);
2052         ssize_t status;
2053         long value;
2054         unsigned long flags;
2055
2056         status = kstrtol(buf, 0, &value);
2057         if (status)
2058                 return status;
2059
2060         if (value < 1)
2061                 return -EINVAL;
2062
2063         /*
2064          * Changing the queue size in fly is safe, if size becomes smaller
2065          * than current size, it will just not accept new entries until
2066          * it has shrank enough.
2067          */
2068         spin_lock_irqsave(&dd->lock, flags);
2069         dd->queue.max_qlen = value;
2070         spin_unlock_irqrestore(&dd->lock, flags);
2071
2072         return size;
2073 }
2074
2075 static DEVICE_ATTR_RW(queue_len);
2076 static DEVICE_ATTR_RW(fallback);
2077
2078 static struct attribute *omap_sham_attrs[] = {
2079         &dev_attr_queue_len.attr,
2080         &dev_attr_fallback.attr,
2081         NULL,
2082 };
2083
2084 static struct attribute_group omap_sham_attr_group = {
2085         .attrs = omap_sham_attrs,
2086 };
2087
2088 static int omap_sham_probe(struct platform_device *pdev)
2089 {
2090         struct omap_sham_dev *dd;
2091         struct device *dev = &pdev->dev;
2092         struct resource res;
2093         dma_cap_mask_t mask;
2094         int err, i, j;
2095         u32 rev;
2096
2097         dd = devm_kzalloc(dev, sizeof(struct omap_sham_dev), GFP_KERNEL);
2098         if (dd == NULL) {
2099                 dev_err(dev, "unable to alloc data struct.\n");
2100                 err = -ENOMEM;
2101                 goto data_err;
2102         }
2103         dd->dev = dev;
2104         platform_set_drvdata(pdev, dd);
2105
2106         INIT_LIST_HEAD(&dd->list);
2107         spin_lock_init(&dd->lock);
2108         tasklet_init(&dd->done_task, omap_sham_done_task, (unsigned long)dd);
2109         crypto_init_queue(&dd->queue, OMAP_SHAM_QUEUE_LENGTH);
2110
2111         err = (dev->of_node) ? omap_sham_get_res_of(dd, dev, &res) :
2112                                omap_sham_get_res_pdev(dd, pdev, &res);
2113         if (err)
2114                 goto data_err;
2115
2116         dd->io_base = devm_ioremap_resource(dev, &res);
2117         if (IS_ERR(dd->io_base)) {
2118                 err = PTR_ERR(dd->io_base);
2119                 goto data_err;
2120         }
2121         dd->phys_base = res.start;
2122
2123         err = devm_request_irq(dev, dd->irq, dd->pdata->intr_hdlr,
2124                                IRQF_TRIGGER_NONE, dev_name(dev), dd);
2125         if (err) {
2126                 dev_err(dev, "unable to request irq %d, err = %d\n",
2127                         dd->irq, err);
2128                 goto data_err;
2129         }
2130
2131         dma_cap_zero(mask);
2132         dma_cap_set(DMA_SLAVE, mask);
2133
2134         dd->dma_lch = dma_request_chan(dev, "rx");
2135         if (IS_ERR(dd->dma_lch)) {
2136                 err = PTR_ERR(dd->dma_lch);
2137                 if (err == -EPROBE_DEFER)
2138                         goto data_err;
2139
2140                 dd->polling_mode = 1;
2141                 dev_dbg(dev, "using polling mode instead of dma\n");
2142         }
2143
2144         dd->flags |= dd->pdata->flags;
2145
2146         pm_runtime_use_autosuspend(dev);
2147         pm_runtime_set_autosuspend_delay(dev, DEFAULT_AUTOSUSPEND_DELAY);
2148
2149         dd->fallback_sz = OMAP_SHA_DMA_THRESHOLD;
2150
2151         pm_runtime_enable(dev);
2152         pm_runtime_irq_safe(dev);
2153
2154         err = pm_runtime_get_sync(dev);
2155         if (err < 0) {
2156                 dev_err(dev, "failed to get sync: %d\n", err);
2157                 goto err_pm;
2158         }
2159
2160         rev = omap_sham_read(dd, SHA_REG_REV(dd));
2161         pm_runtime_put_sync(&pdev->dev);
2162
2163         dev_info(dev, "hw accel on OMAP rev %u.%u\n",
2164                 (rev & dd->pdata->major_mask) >> dd->pdata->major_shift,
2165                 (rev & dd->pdata->minor_mask) >> dd->pdata->minor_shift);
2166
2167         spin_lock(&sham.lock);
2168         list_add_tail(&dd->list, &sham.dev_list);
2169         spin_unlock(&sham.lock);
2170
2171         for (i = 0; i < dd->pdata->algs_info_size; i++) {
2172                 for (j = 0; j < dd->pdata->algs_info[i].size; j++) {
2173                         struct ahash_alg *alg;
2174
2175                         alg = &dd->pdata->algs_info[i].algs_list[j];
2176                         alg->export = omap_sham_export;
2177                         alg->import = omap_sham_import;
2178                         alg->halg.statesize = sizeof(struct omap_sham_reqctx) +
2179                                               BUFLEN;
2180                         err = crypto_register_ahash(alg);
2181                         if (err)
2182                                 goto err_algs;
2183
2184                         dd->pdata->algs_info[i].registered++;
2185                 }
2186         }
2187
2188         err = sysfs_create_group(&dev->kobj, &omap_sham_attr_group);
2189         if (err) {
2190                 dev_err(dev, "could not create sysfs device attrs\n");
2191                 goto err_algs;
2192         }
2193
2194         return 0;
2195
2196 err_algs:
2197         for (i = dd->pdata->algs_info_size - 1; i >= 0; i--)
2198                 for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--)
2199                         crypto_unregister_ahash(
2200                                         &dd->pdata->algs_info[i].algs_list[j]);
2201 err_pm:
2202         pm_runtime_disable(dev);
2203         if (!dd->polling_mode)
2204                 dma_release_channel(dd->dma_lch);
2205 data_err:
2206         dev_err(dev, "initialization failed.\n");
2207
2208         return err;
2209 }
2210
2211 static int omap_sham_remove(struct platform_device *pdev)
2212 {
2213         struct omap_sham_dev *dd;
2214         int i, j;
2215
2216         dd = platform_get_drvdata(pdev);
2217         if (!dd)
2218                 return -ENODEV;
2219         spin_lock(&sham.lock);
2220         list_del(&dd->list);
2221         spin_unlock(&sham.lock);
2222         for (i = dd->pdata->algs_info_size - 1; i >= 0; i--)
2223                 for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--)
2224                         crypto_unregister_ahash(
2225                                         &dd->pdata->algs_info[i].algs_list[j]);
2226         tasklet_kill(&dd->done_task);
2227         pm_runtime_disable(&pdev->dev);
2228
2229         if (!dd->polling_mode)
2230                 dma_release_channel(dd->dma_lch);
2231
2232         return 0;
2233 }
2234
2235 #ifdef CONFIG_PM_SLEEP
2236 static int omap_sham_suspend(struct device *dev)
2237 {
2238         pm_runtime_put_sync(dev);
2239         return 0;
2240 }
2241
2242 static int omap_sham_resume(struct device *dev)
2243 {
2244         int err = pm_runtime_get_sync(dev);
2245         if (err < 0) {
2246                 dev_err(dev, "failed to get sync: %d\n", err);
2247                 return err;
2248         }
2249         return 0;
2250 }
2251 #endif
2252
2253 static SIMPLE_DEV_PM_OPS(omap_sham_pm_ops, omap_sham_suspend, omap_sham_resume);
2254
2255 static struct platform_driver omap_sham_driver = {
2256         .probe  = omap_sham_probe,
2257         .remove = omap_sham_remove,
2258         .driver = {
2259                 .name   = "omap-sham",
2260                 .pm     = &omap_sham_pm_ops,
2261                 .of_match_table = omap_sham_of_match,
2262         },
2263 };
2264
2265 module_platform_driver(omap_sham_driver);
2266
2267 MODULE_DESCRIPTION("OMAP SHA1/MD5 hw acceleration support.");
2268 MODULE_LICENSE("GPL v2");
2269 MODULE_AUTHOR("Dmitry Kasatkin");
2270 MODULE_ALIAS("platform:omap-sham");