drivers/crypto/img-hash.c

   1 /*
   2  * Copyright (c) 2014 Imagination Technologies
   3  * Authors:  Will Thomas, James Hartley
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as published
   7  * by the Free Software Foundation.
   8  *
   9  *      Interface structure taken from omap-sham driver
  10  */
  11
  12 #include <linux/clk.h>
  13 #include <linux/dmaengine.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/io.h>
  16 #include <linux/kernel.h>
  17 #include <linux/module.h>
  18 #include <linux/of_device.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/scatterlist.h>
  21
  22 #include <crypto/internal/hash.h>
  23 #include <crypto/md5.h>
  24 #include <crypto/sha.h>
  25
  26 #define CR_RESET                        0
  27 #define CR_RESET_SET                    1
  28 #define CR_RESET_UNSET                  0
  29
  30 #define CR_MESSAGE_LENGTH_H             0x4
  31 #define CR_MESSAGE_LENGTH_L             0x8
  32
  33 #define CR_CONTROL                      0xc
  34 #define CR_CONTROL_BYTE_ORDER_3210      0
  35 #define CR_CONTROL_BYTE_ORDER_0123      1
  36 #define CR_CONTROL_BYTE_ORDER_2310      2
  37 #define CR_CONTROL_BYTE_ORDER_1032      3
  38 #define CR_CONTROL_BYTE_ORDER_SHIFT     8
  39 #define CR_CONTROL_ALGO_MD5     0
  40 #define CR_CONTROL_ALGO_SHA1    1
  41 #define CR_CONTROL_ALGO_SHA224  2
  42 #define CR_CONTROL_ALGO_SHA256  3
  43
  44 #define CR_INTSTAT                      0x10
  45 #define CR_INTENAB                      0x14
  46 #define CR_INTCLEAR                     0x18
  47 #define CR_INT_RESULTS_AVAILABLE        BIT(0)
  48 #define CR_INT_NEW_RESULTS_SET          BIT(1)
  49 #define CR_INT_RESULT_READ_ERR          BIT(2)
  50 #define CR_INT_MESSAGE_WRITE_ERROR      BIT(3)
  51 #define CR_INT_STATUS                   BIT(8)
  52
  53 #define CR_RESULT_QUEUE         0x1c
  54 #define CR_RSD0                         0x40
  55 #define CR_CORE_REV                     0x50
  56 #define CR_CORE_DES1            0x60
  57 #define CR_CORE_DES2            0x70
  58
  59 #define DRIVER_FLAGS_BUSY               BIT(0)
  60 #define DRIVER_FLAGS_FINAL              BIT(1)
  61 #define DRIVER_FLAGS_DMA_ACTIVE         BIT(2)
  62 #define DRIVER_FLAGS_OUTPUT_READY       BIT(3)
  63 #define DRIVER_FLAGS_INIT               BIT(4)
  64 #define DRIVER_FLAGS_CPU                BIT(5)
  65 #define DRIVER_FLAGS_DMA_READY          BIT(6)
  66 #define DRIVER_FLAGS_ERROR              BIT(7)
  67 #define DRIVER_FLAGS_SG                 BIT(8)
  68 #define DRIVER_FLAGS_SHA1               BIT(18)
  69 #define DRIVER_FLAGS_SHA224             BIT(19)
  70 #define DRIVER_FLAGS_SHA256             BIT(20)
  71 #define DRIVER_FLAGS_MD5                BIT(21)
  72
  73 #define IMG_HASH_QUEUE_LENGTH           20
  74 #define IMG_HASH_DMA_THRESHOLD          64
  75
  76 #ifdef __LITTLE_ENDIAN
  77 #define IMG_HASH_BYTE_ORDER             CR_CONTROL_BYTE_ORDER_3210
  78 #else
  79 #define IMG_HASH_BYTE_ORDER             CR_CONTROL_BYTE_ORDER_0123
  80 #endif
  81
  82 struct img_hash_dev;
  83
  84 struct img_hash_request_ctx {
  85         struct img_hash_dev     *hdev;
  86         u8 digest[SHA256_DIGEST_SIZE] __aligned(sizeof(u32));
  87         unsigned long           flags;
  88         size_t                  digsize;
  89
  90         dma_addr_t              dma_addr;
  91         size_t                  dma_ct;
  92
  93         /* sg root */
  94         struct scatterlist      *sgfirst;
  95         /* walk state */
  96         struct scatterlist      *sg;
  97         size_t                  nents;
  98         size_t                  offset;
  99         unsigned int            total;
 100         size_t                  sent;
 101
 102         unsigned long           op;
 103
 104         size_t                  bufcnt;
 105         u8 buffer[0] __aligned(sizeof(u32));
 106         struct ahash_request    fallback_req;
 107 };
 108
 109 struct img_hash_ctx {
 110         struct img_hash_dev     *hdev;
 111         unsigned long           flags;
 112         struct crypto_ahash     *fallback;
 113 };
 114
 115 struct img_hash_dev {
 116         struct list_head        list;
 117         struct device           *dev;
 118         struct clk              *hash_clk;
 119         struct clk              *sys_clk;
 120         void __iomem            *io_base;
 121
 122         phys_addr_t             bus_addr;
 123         void __iomem            *cpu_addr;
 124
 125         spinlock_t              lock;
 126         int                     err;
 127         struct tasklet_struct   done_task;
 128         struct tasklet_struct   dma_task;
 129
 130         unsigned long           flags;
 131         struct crypto_queue     queue;
 132         struct ahash_request    *req;
 133
 134         struct dma_chan         *dma_lch;
 135 };
 136
 137 struct img_hash_drv {
 138         struct list_head dev_list;
 139         spinlock_t lock;
 140 };
 141
 142 static struct img_hash_drv img_hash = {
 143         .dev_list = LIST_HEAD_INIT(img_hash.dev_list),
 144         .lock = __SPIN_LOCK_UNLOCKED(img_hash.lock),
 145 };
 146
 147 static inline u32 img_hash_read(struct img_hash_dev *hdev, u32 offset)
 148 {
 149         return readl_relaxed(hdev->io_base + offset);
 150 }
 151
 152 static inline void img_hash_write(struct img_hash_dev *hdev,
 153                                   u32 offset, u32 value)
 154 {
 155         writel_relaxed(value, hdev->io_base + offset);
 156 }
 157
 158 static inline u32 img_hash_read_result_queue(struct img_hash_dev *hdev)
 159 {
 160         return be32_to_cpu(img_hash_read(hdev, CR_RESULT_QUEUE));
 161 }
 162
 163 static void img_hash_start(struct img_hash_dev *hdev, bool dma)
 164 {
 165         struct img_hash_request_ctx *ctx = ahash_request_ctx(hdev->req);
 166         u32 cr = IMG_HASH_BYTE_ORDER << CR_CONTROL_BYTE_ORDER_SHIFT;
 167
 168         if (ctx->flags & DRIVER_FLAGS_MD5)
 169                 cr |= CR_CONTROL_ALGO_MD5;
 170         else if (ctx->flags & DRIVER_FLAGS_SHA1)
 171                 cr |= CR_CONTROL_ALGO_SHA1;
 172         else if (ctx->flags & DRIVER_FLAGS_SHA224)
 173                 cr |= CR_CONTROL_ALGO_SHA224;
 174         else if (ctx->flags & DRIVER_FLAGS_SHA256)
 175                 cr |= CR_CONTROL_ALGO_SHA256;
 176         dev_dbg(hdev->dev, "Starting hash process\n");
 177         img_hash_write(hdev, CR_CONTROL, cr);
 178
 179         /*
 180          * The hardware block requires two cycles between writing the control
 181          * register and writing the first word of data in non DMA mode, to
 182          * ensure the first data write is not grouped in burst with the control
 183          * register write a read is issued to 'flush' the bus.
 184          */
 185         if (!dma)
 186                 img_hash_read(hdev, CR_CONTROL);
 187 }
 188
 189 static int img_hash_xmit_cpu(struct img_hash_dev *hdev, const u8 *buf,
 190                              size_t length, int final)
 191 {
 192         u32 count, len32;
 193         const u32 *buffer = (const u32 *)buf;
 194
 195         dev_dbg(hdev->dev, "xmit_cpu:  length: %zu bytes\n", length);
 196
 197         if (final)
 198                 hdev->flags |= DRIVER_FLAGS_FINAL;
 199
 200         len32 = DIV_ROUND_UP(length, sizeof(u32));
 201
 202         for (count = 0; count < len32; count++)
 203                 writel_relaxed(buffer[count], hdev->cpu_addr);
 204
 205         return -EINPROGRESS;
 206 }
 207
 208 static void img_hash_dma_callback(void *data)
 209 {
 210         struct img_hash_dev *hdev = (struct img_hash_dev *)data;
 211         struct img_hash_request_ctx *ctx = ahash_request_ctx(hdev->req);
 212
 213         if (ctx->bufcnt) {
 214                 img_hash_xmit_cpu(hdev, ctx->buffer, ctx->bufcnt, 0);
 215                 ctx->bufcnt = 0;
 216         }
 217         if (ctx->sg)
 218                 tasklet_schedule(&hdev->dma_task);
 219 }
 220
 221 static int img_hash_xmit_dma(struct img_hash_dev *hdev, struct scatterlist *sg)
 222 {
 223         struct dma_async_tx_descriptor *desc;
 224         struct img_hash_request_ctx *ctx = ahash_request_ctx(hdev->req);
 225
 226         ctx->dma_ct = dma_map_sg(hdev->dev, sg, 1, DMA_MEM_TO_DEV);
 227         if (ctx->dma_ct == 0) {
 228                 dev_err(hdev->dev, "Invalid DMA sg\n");
 229                 hdev->err = -EINVAL;
 230                 return -EINVAL;
 231         }
 232
 233         desc = dmaengine_prep_slave_sg(hdev->dma_lch,
 234                                        sg,
 235                                        ctx->dma_ct,
 236                                        DMA_MEM_TO_DEV,
 237                                        DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 238         if (!desc) {
 239                 dev_err(hdev->dev, "Null DMA descriptor\n");
 240                 hdev->err = -EINVAL;
 241                 dma_unmap_sg(hdev->dev, sg, 1, DMA_MEM_TO_DEV);
 242                 return -EINVAL;
 243         }
 244         desc->callback = img_hash_dma_callback;
 245         desc->callback_param = hdev;
 246         dmaengine_submit(desc);
 247         dma_async_issue_pending(hdev->dma_lch);
 248
 249         return 0;
 250 }
 251
 252 static int img_hash_write_via_cpu(struct img_hash_dev *hdev)
 253 {
 254         struct img_hash_request_ctx *ctx = ahash_request_ctx(hdev->req);
 255
 256         ctx->bufcnt = sg_copy_to_buffer(hdev->req->src, sg_nents(ctx->sg),
 257                                         ctx->buffer, hdev->req->nbytes);
 258
 259         ctx->total = hdev->req->nbytes;
 260         ctx->bufcnt = 0;
 261
 262         hdev->flags |= (DRIVER_FLAGS_CPU | DRIVER_FLAGS_FINAL);
 263
 264         img_hash_start(hdev, false);
 265
 266         return img_hash_xmit_cpu(hdev, ctx->buffer, ctx->total, 1);
 267 }
 268
 269 static int img_hash_finish(struct ahash_request *req)
 270 {
 271         struct img_hash_request_ctx *ctx = ahash_request_ctx(req);
 272
 273         if (!req->result)
 274                 return -EINVAL;
 275
 276         memcpy(req->result, ctx->digest, ctx->digsize);
 277
 278         return 0;
 279 }
 280
 281 static void img_hash_copy_hash(struct ahash_request *req)
 282 {
 283         struct img_hash_request_ctx *ctx = ahash_request_ctx(req);
 284         u32 *hash = (u32 *)ctx->digest;
 285         int i;
 286
 287         for (i = (ctx->digsize / sizeof(u32)) - 1; i >= 0; i--)
 288                 hash[i] = img_hash_read_result_queue(ctx->hdev);
 289 }
 290
 291 static void img_hash_finish_req(struct ahash_request *req, int err)
 292 {
 293         struct img_hash_request_ctx *ctx = ahash_request_ctx(req);
 294         struct img_hash_dev *hdev =  ctx->hdev;
 295
 296         if (!err) {
 297                 img_hash_copy_hash(req);
 298                 if (DRIVER_FLAGS_FINAL & hdev->flags)
 299                         err = img_hash_finish(req);
 300         } else {
 301                 dev_warn(hdev->dev, "Hash failed with error %d\n", err);
 302                 ctx->flags |= DRIVER_FLAGS_ERROR;
 303         }
 304
 305         hdev->flags &= ~(DRIVER_FLAGS_DMA_READY | DRIVER_FLAGS_OUTPUT_READY |
 306                 DRIVER_FLAGS_CPU | DRIVER_FLAGS_BUSY | DRIVER_FLAGS_FINAL);
 307
 308         if (req->base.complete)
 309                 req->base.complete(&req->base, err);
 310 }
 311
 312 static int img_hash_write_via_dma(struct img_hash_dev *hdev)
 313 {
 314         struct img_hash_request_ctx *ctx = ahash_request_ctx(hdev->req);
 315
 316         img_hash_start(hdev, true);
 317
 318         dev_dbg(hdev->dev, "xmit dma size: %d\n", ctx->total);
 319
 320         if (!ctx->total)
 321                 hdev->flags |= DRIVER_FLAGS_FINAL;
 322
 323         hdev->flags |= DRIVER_FLAGS_DMA_ACTIVE | DRIVER_FLAGS_FINAL;
 324
 325         tasklet_schedule(&hdev->dma_task);
 326
 327         return -EINPROGRESS;
 328 }
 329
 330 static int img_hash_dma_init(struct img_hash_dev *hdev)
 331 {
 332         struct dma_slave_config dma_conf;
 333         int err = -EINVAL;
 334
 335         hdev->dma_lch = dma_request_slave_channel(hdev->dev, "tx");
 336         if (!hdev->dma_lch) {
 337                 dev_err(hdev->dev, "Couldn't acquire a slave DMA channel.\n");
 338                 return -EBUSY;
 339         }
 340         dma_conf.direction = DMA_MEM_TO_DEV;
 341         dma_conf.dst_addr = hdev->bus_addr;
 342         dma_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 343         dma_conf.dst_maxburst = 16;
 344         dma_conf.device_fc = false;
 345
 346         err = dmaengine_slave_config(hdev->dma_lch,  &dma_conf);
 347         if (err) {
 348                 dev_err(hdev->dev, "Couldn't configure DMA slave.\n");
 349                 dma_release_channel(hdev->dma_lch);
 350                 return err;
 351         }
 352
 353         return 0;
 354 }
 355
 356 static void img_hash_dma_task(unsigned long d)
 357 {
 358         struct img_hash_dev *hdev = (struct img_hash_dev *)d;
 359         struct img_hash_request_ctx *ctx = ahash_request_ctx(hdev->req);
 360         u8 *addr;
 361         size_t nbytes, bleft, wsend, len, tbc;
 362         struct scatterlist tsg;
 363
 364         if (!ctx->sg)
 365                 return;
 366
 367         addr = sg_virt(ctx->sg);
 368         nbytes = ctx->sg->length - ctx->offset;
 369
 370         /*
 371          * The hash accelerator does not support a data valid mask. This means
 372          * that if each dma (i.e. per page) is not a multiple of 4 bytes, the
 373          * padding bytes in the last word written by that dma would erroneously
 374          * be included in the hash. To avoid this we round down the transfer,
 375          * and add the excess to the start of the next dma. It does not matter
 376          * that the final dma may not be a multiple of 4 bytes as the hashing
 377          * block is programmed to accept the correct number of bytes.
 378          */
 379
 380         bleft = nbytes % 4;
 381         wsend = (nbytes / 4);
 382
 383         if (wsend) {
 384                 sg_init_one(&tsg, addr + ctx->offset, wsend * 4);
 385                 if (img_hash_xmit_dma(hdev, &tsg)) {
 386                         dev_err(hdev->dev, "DMA failed, falling back to CPU");
 387                         ctx->flags |= DRIVER_FLAGS_CPU;
 388                         hdev->err = 0;
 389                         img_hash_xmit_cpu(hdev, addr + ctx->offset,
 390                                           wsend * 4, 0);
 391                         ctx->sent += wsend * 4;
 392                         wsend = 0;
 393                 } else {
 394                         ctx->sent += wsend * 4;
 395                 }
 396         }
 397
 398         if (bleft) {
 399                 ctx->bufcnt = sg_pcopy_to_buffer(ctx->sgfirst, ctx->nents,
 400                                                  ctx->buffer, bleft, ctx->sent);
 401                 tbc = 0;
 402                 ctx->sg = sg_next(ctx->sg);
 403                 while (ctx->sg && (ctx->bufcnt < 4)) {
 404                         len = ctx->sg->length;
 405                         if (likely(len > (4 - ctx->bufcnt)))
 406                                 len = 4 - ctx->bufcnt;
 407                         tbc = sg_pcopy_to_buffer(ctx->sgfirst, ctx->nents,
 408                                                  ctx->buffer + ctx->bufcnt, len,
 409                                         ctx->sent + ctx->bufcnt);
 410                         ctx->bufcnt += tbc;
 411                         if (tbc >= ctx->sg->length) {
 412                                 ctx->sg = sg_next(ctx->sg);
 413                                 tbc = 0;
 414                         }
 415                 }
 416
 417                 ctx->sent += ctx->bufcnt;
 418                 ctx->offset = tbc;
 419
 420                 if (!wsend)
 421                         img_hash_dma_callback(hdev);
 422         } else {
 423                 ctx->offset = 0;
 424                 ctx->sg = sg_next(ctx->sg);
 425         }
 426 }
 427
 428 static int img_hash_write_via_dma_stop(struct img_hash_dev *hdev)
 429 {
 430         struct img_hash_request_ctx *ctx = ahash_request_ctx(hdev->req);
 431
 432         if (ctx->flags & DRIVER_FLAGS_SG)
 433                 dma_unmap_sg(hdev->dev, ctx->sg, ctx->dma_ct, DMA_TO_DEVICE);
 434
 435         return 0;
 436 }
 437
 438 static int img_hash_process_data(struct img_hash_dev *hdev)
 439 {
 440         struct ahash_request *req = hdev->req;
 441         struct img_hash_request_ctx *ctx = ahash_request_ctx(req);
 442         int err = 0;
 443
 444         ctx->bufcnt = 0;
 445
 446         if (req->nbytes >= IMG_HASH_DMA_THRESHOLD) {
 447                 dev_dbg(hdev->dev, "process data request(%d bytes) using DMA\n",
 448                         req->nbytes);
 449                 err = img_hash_write_via_dma(hdev);
 450         } else {
 451                 dev_dbg(hdev->dev, "process data request(%d bytes) using CPU\n",
 452                         req->nbytes);
 453                 err = img_hash_write_via_cpu(hdev);
 454         }
 455         return err;
 456 }
 457
 458 static int img_hash_hw_init(struct img_hash_dev *hdev)
 459 {
 460         unsigned long long nbits;
 461         u32 u, l;
 462
 463         img_hash_write(hdev, CR_RESET, CR_RESET_SET);
 464         img_hash_write(hdev, CR_RESET, CR_RESET_UNSET);
 465         img_hash_write(hdev, CR_INTENAB, CR_INT_NEW_RESULTS_SET);
 466
 467         nbits = (u64)hdev->req->nbytes << 3;
 468         u = nbits >> 32;
 469         l = nbits;
 470         img_hash_write(hdev, CR_MESSAGE_LENGTH_H, u);
 471         img_hash_write(hdev, CR_MESSAGE_LENGTH_L, l);
 472
 473         if (!(DRIVER_FLAGS_INIT & hdev->flags)) {
 474                 hdev->flags |= DRIVER_FLAGS_INIT;
 475                 hdev->err = 0;
 476         }
 477         dev_dbg(hdev->dev, "hw initialized, nbits: %llx\n", nbits);
 478         return 0;
 479 }
 480
 481 static int img_hash_init(struct ahash_request *req)
 482 {
 483         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 484         struct img_hash_request_ctx *rctx = ahash_request_ctx(req);
 485         struct img_hash_ctx *ctx = crypto_ahash_ctx(tfm);
 486
 487         ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback);
 488         rctx->fallback_req.base.flags = req->base.flags
 489                 & CRYPTO_TFM_REQ_MAY_SLEEP;
 490
 491         return crypto_ahash_init(&rctx->fallback_req);
 492 }
 493
 494 static int img_hash_handle_queue(struct img_hash_dev *hdev,
 495                                  struct ahash_request *req)
 496 {
 497         struct crypto_async_request *async_req, *backlog;
 498         struct img_hash_request_ctx *ctx;
 499         unsigned long flags;
 500         int err = 0, res = 0;
 501
 502         spin_lock_irqsave(&hdev->lock, flags);
 503
 504         if (req)
 505                 res = ahash_enqueue_request(&hdev->queue, req);
 506
 507         if (DRIVER_FLAGS_BUSY & hdev->flags) {
 508                 spin_unlock_irqrestore(&hdev->lock, flags);
 509                 return res;
 510         }
 511
 512         backlog = crypto_get_backlog(&hdev->queue);
 513         async_req = crypto_dequeue_request(&hdev->queue);
 514         if (async_req)
 515                 hdev->flags |= DRIVER_FLAGS_BUSY;
 516
 517         spin_unlock_irqrestore(&hdev->lock, flags);
 518
 519         if (!async_req)
 520                 return res;
 521
 522         if (backlog)
 523                 backlog->complete(backlog, -EINPROGRESS);
 524
 525         req = ahash_request_cast(async_req);
 526         hdev->req = req;
 527
 528         ctx = ahash_request_ctx(req);
 529
 530         dev_info(hdev->dev, "processing req, op: %lu, bytes: %d\n",
 531                  ctx->op, req->nbytes);
 532
 533         err = img_hash_hw_init(hdev);
 534
 535         if (!err)
 536                 err = img_hash_process_data(hdev);
 537
 538         if (err != -EINPROGRESS) {
 539                 /* done_task will not finish so do it here */
 540                 img_hash_finish_req(req, err);
 541         }
 542         return res;
 543 }
 544
 545 static int img_hash_update(struct ahash_request *req)
 546 {
 547         struct img_hash_request_ctx *rctx = ahash_request_ctx(req);
 548         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 549         struct img_hash_ctx *ctx = crypto_ahash_ctx(tfm);
 550
 551         ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback);
 552         rctx->fallback_req.base.flags = req->base.flags
 553                 & CRYPTO_TFM_REQ_MAY_SLEEP;
 554         rctx->fallback_req.nbytes = req->nbytes;
 555         rctx->fallback_req.src = req->src;
 556
 557         return crypto_ahash_update(&rctx->fallback_req);
 558 }
 559
 560 static int img_hash_final(struct ahash_request *req)
 561 {
 562         struct img_hash_request_ctx *rctx = ahash_request_ctx(req);
 563         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 564         struct img_hash_ctx *ctx = crypto_ahash_ctx(tfm);
 565
 566         ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback);
 567         rctx->fallback_req.base.flags = req->base.flags
 568                 & CRYPTO_TFM_REQ_MAY_SLEEP;
 569         rctx->fallback_req.result = req->result;
 570
 571         return crypto_ahash_final(&rctx->fallback_req);
 572 }
 573
 574 static int img_hash_finup(struct ahash_request *req)
 575 {
 576         struct img_hash_request_ctx *rctx = ahash_request_ctx(req);
 577         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 578         struct img_hash_ctx *ctx = crypto_ahash_ctx(tfm);
 579
 580         ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback);
 581         rctx->fallback_req.base.flags = req->base.flags
 582                 & CRYPTO_TFM_REQ_MAY_SLEEP;
 583         rctx->fallback_req.nbytes = req->nbytes;
 584         rctx->fallback_req.src = req->src;
 585         rctx->fallback_req.result = req->result;
 586
 587         return crypto_ahash_finup(&rctx->fallback_req);
 588 }
 589
 590 static int img_hash_digest(struct ahash_request *req)
 591 {
 592         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 593         struct img_hash_ctx *tctx = crypto_ahash_ctx(tfm);
 594         struct img_hash_request_ctx *ctx = ahash_request_ctx(req);
 595         struct img_hash_dev *hdev = NULL;
 596         struct img_hash_dev *tmp;
 597         int err;
 598
 599         spin_lock(&img_hash.lock);
 600         if (!tctx->hdev) {
 601                 list_for_each_entry(tmp, &img_hash.dev_list, list) {
 602                         hdev = tmp;
 603                         break;
 604                 }
 605                 tctx->hdev = hdev;
 606
 607         } else {
 608                 hdev = tctx->hdev;
 609         }
 610
 611         spin_unlock(&img_hash.lock);
 612         ctx->hdev = hdev;
 613         ctx->flags = 0;
 614         ctx->digsize = crypto_ahash_digestsize(tfm);
 615
 616         switch (ctx->digsize) {
 617         case SHA1_DIGEST_SIZE:
 618                 ctx->flags |= DRIVER_FLAGS_SHA1;
 619                 break;
 620         case SHA256_DIGEST_SIZE:
 621                 ctx->flags |= DRIVER_FLAGS_SHA256;
 622                 break;
 623         case SHA224_DIGEST_SIZE:
 624                 ctx->flags |= DRIVER_FLAGS_SHA224;
 625                 break;
 626         case MD5_DIGEST_SIZE:
 627                 ctx->flags |= DRIVER_FLAGS_MD5;
 628                 break;
 629         default:
 630                 return -EINVAL;
 631         }
 632
 633         ctx->bufcnt = 0;
 634         ctx->offset = 0;
 635         ctx->sent = 0;
 636         ctx->total = req->nbytes;
 637         ctx->sg = req->src;
 638         ctx->sgfirst = req->src;
 639         ctx->nents = sg_nents(ctx->sg);
 640
 641         err = img_hash_handle_queue(tctx->hdev, req);
 642
 643         return err;
 644 }
 645
 646 static int img_hash_cra_init(struct crypto_tfm *tfm)
 647 {
 648         struct img_hash_ctx *ctx = crypto_tfm_ctx(tfm);
 649         const char *alg_name = crypto_tfm_alg_name(tfm);
 650         int err = -ENOMEM;
 651
 652         ctx->fallback = crypto_alloc_ahash(alg_name, 0,
 653                                            CRYPTO_ALG_NEED_FALLBACK);
 654         if (IS_ERR(ctx->fallback)) {
 655                 pr_err("img_hash: Could not load fallback driver.\n");
 656                 err = PTR_ERR(ctx->fallback);
 657                 goto err;
 658         }
 659         crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
 660                                  sizeof(struct img_hash_request_ctx) +
 661                                  IMG_HASH_DMA_THRESHOLD);
 662
 663         return 0;
 664
 665 err:
 666         return err;
 667 }
 668
 669 static void img_hash_cra_exit(struct crypto_tfm *tfm)
 670 {
 671         struct img_hash_ctx *tctx = crypto_tfm_ctx(tfm);
 672
 673         crypto_free_ahash(tctx->fallback);
 674 }
 675
 676 static irqreturn_t img_irq_handler(int irq, void *dev_id)
 677 {
 678         struct img_hash_dev *hdev = dev_id;
 679         u32 reg;
 680
 681         reg = img_hash_read(hdev, CR_INTSTAT);
 682         img_hash_write(hdev, CR_INTCLEAR, reg);
 683
 684         if (reg & CR_INT_NEW_RESULTS_SET) {
 685                 dev_dbg(hdev->dev, "IRQ CR_INT_NEW_RESULTS_SET\n");
 686                 if (DRIVER_FLAGS_BUSY & hdev->flags) {
 687                         hdev->flags |= DRIVER_FLAGS_OUTPUT_READY;
 688                         if (!(DRIVER_FLAGS_CPU & hdev->flags))
 689                                 hdev->flags |= DRIVER_FLAGS_DMA_READY;
 690                         tasklet_schedule(&hdev->done_task);
 691                 } else {
 692                         dev_warn(hdev->dev,
 693                                  "HASH interrupt when no active requests.\n");
 694                 }
 695         } else if (reg & CR_INT_RESULTS_AVAILABLE) {
 696                 dev_warn(hdev->dev,
 697                          "IRQ triggered before the hash had completed\n");
 698         } else if (reg & CR_INT_RESULT_READ_ERR) {
 699                 dev_warn(hdev->dev,
 700                          "Attempt to read from an empty result queue\n");
 701         } else if (reg & CR_INT_MESSAGE_WRITE_ERROR) {
 702                 dev_warn(hdev->dev,
 703                          "Data written before the hardware was configured\n");
 704         }
 705         return IRQ_HANDLED;
 706 }
 707
 708 static struct ahash_alg img_algs[] = {
 709         {
 710                 .init = img_hash_init,
 711                 .update = img_hash_update,
 712                 .final = img_hash_final,
 713                 .finup = img_hash_finup,
 714                 .digest = img_hash_digest,
 715                 .halg = {
 716                         .digestsize = MD5_DIGEST_SIZE,
 717                         .base = {
 718                                 .cra_name = "md5",
 719                                 .cra_driver_name = "img-md5",
 720                                 .cra_priority = 300,
 721                                 .cra_flags =
 722                                 CRYPTO_ALG_ASYNC |
 723                                 CRYPTO_ALG_NEED_FALLBACK,
 724                                 .cra_blocksize = MD5_HMAC_BLOCK_SIZE,
 725                                 .cra_ctxsize = sizeof(struct img_hash_ctx),
 726                                 .cra_init = img_hash_cra_init,
 727                                 .cra_exit = img_hash_cra_exit,
 728                                 .cra_module = THIS_MODULE,
 729                         }
 730                 }
 731         },
 732         {
 733                 .init = img_hash_init,
 734                 .update = img_hash_update,
 735                 .final = img_hash_final,
 736                 .finup = img_hash_finup,
 737                 .digest = img_hash_digest,
 738                 .halg = {
 739                         .digestsize = SHA1_DIGEST_SIZE,
 740                         .base = {
 741                                 .cra_name = "sha1",
 742                                 .cra_driver_name = "img-sha1",
 743                                 .cra_priority = 300,
 744                                 .cra_flags =
 745                                 CRYPTO_ALG_ASYNC |
 746                                 CRYPTO_ALG_NEED_FALLBACK,
 747                                 .cra_blocksize = SHA1_BLOCK_SIZE,
 748                                 .cra_ctxsize = sizeof(struct img_hash_ctx),
 749                                 .cra_init = img_hash_cra_init,
 750                                 .cra_exit = img_hash_cra_exit,
 751                                 .cra_module = THIS_MODULE,
 752                         }
 753                 }
 754         },
 755         {
 756                 .init = img_hash_init,
 757                 .update = img_hash_update,
 758                 .final = img_hash_final,
 759                 .finup = img_hash_finup,
 760                 .digest = img_hash_digest,
 761                 .halg = {
 762                         .digestsize = SHA224_DIGEST_SIZE,
 763                         .base = {
 764                                 .cra_name = "sha224",
 765                                 .cra_driver_name = "img-sha224",
 766                                 .cra_priority = 300,
 767                                 .cra_flags =
 768                                 CRYPTO_ALG_ASYNC |
 769                                 CRYPTO_ALG_NEED_FALLBACK,
 770                                 .cra_blocksize = SHA224_BLOCK_SIZE,
 771                                 .cra_ctxsize = sizeof(struct img_hash_ctx),
 772                                 .cra_init = img_hash_cra_init,
 773                                 .cra_exit = img_hash_cra_exit,
 774                                 .cra_module = THIS_MODULE,
 775                         }
 776                 }
 777         },
 778         {
 779                 .init = img_hash_init,
 780                 .update = img_hash_update,
 781                 .final = img_hash_final,
 782                 .finup = img_hash_finup,
 783                 .digest = img_hash_digest,
 784                 .halg = {
 785                         .digestsize = SHA256_DIGEST_SIZE,
 786                         .base = {
 787                                 .cra_name = "sha256",
 788                                 .cra_driver_name = "img-sha256",
 789                                 .cra_priority = 300,
 790                                 .cra_flags =
 791                                 CRYPTO_ALG_ASYNC |
 792                                 CRYPTO_ALG_NEED_FALLBACK,
 793                                 .cra_blocksize = SHA256_BLOCK_SIZE,
 794                                 .cra_ctxsize = sizeof(struct img_hash_ctx),
 795                                 .cra_init = img_hash_cra_init,
 796                                 .cra_exit = img_hash_cra_exit,
 797                                 .cra_module = THIS_MODULE,
 798                         }
 799                 }
 800         }
 801 };
 802
 803 static int img_register_algs(struct img_hash_dev *hdev)
 804 {
 805         int i, err;
 806
 807         for (i = 0; i < ARRAY_SIZE(img_algs); i++) {
 808                 err = crypto_register_ahash(&img_algs[i]);
 809                 if (err)
 810                         goto err_reg;
 811         }
 812         return 0;
 813
 814 err_reg:
 815         for (; i--; )
 816                 crypto_unregister_ahash(&img_algs[i]);
 817
 818         return err;
 819 }
 820
 821 static int img_unregister_algs(struct img_hash_dev *hdev)
 822 {
 823         int i;
 824
 825         for (i = 0; i < ARRAY_SIZE(img_algs); i++)
 826                 crypto_unregister_ahash(&img_algs[i]);
 827         return 0;
 828 }
 829
 830 static void img_hash_done_task(unsigned long data)
 831 {
 832         struct img_hash_dev *hdev = (struct img_hash_dev *)data;
 833         int err = 0;
 834
 835         if (hdev->err == -EINVAL) {
 836                 err = hdev->err;
 837                 goto finish;
 838         }
 839
 840         if (!(DRIVER_FLAGS_BUSY & hdev->flags)) {
 841                 img_hash_handle_queue(hdev, NULL);
 842                 return;
 843         }
 844
 845         if (DRIVER_FLAGS_CPU & hdev->flags) {
 846                 if (DRIVER_FLAGS_OUTPUT_READY & hdev->flags) {
 847                         hdev->flags &= ~DRIVER_FLAGS_OUTPUT_READY;
 848                         goto finish;
 849                 }
 850         } else if (DRIVER_FLAGS_DMA_READY & hdev->flags) {
 851                 if (DRIVER_FLAGS_DMA_ACTIVE & hdev->flags) {
 852                         hdev->flags &= ~DRIVER_FLAGS_DMA_ACTIVE;
 853                         img_hash_write_via_dma_stop(hdev);
 854                         if (hdev->err) {
 855                                 err = hdev->err;
 856                                 goto finish;
 857                         }
 858                 }
 859                 if (DRIVER_FLAGS_OUTPUT_READY & hdev->flags) {
 860                         hdev->flags &= ~(DRIVER_FLAGS_DMA_READY |
 861                                         DRIVER_FLAGS_OUTPUT_READY);
 862                         goto finish;
 863                 }
 864         }
 865         return;
 866
 867 finish:
 868         img_hash_finish_req(hdev->req, err);
 869 }
 870
 871 static const struct of_device_id img_hash_match[] = {
 872         { .compatible = "img,hash-accelerator" },
 873         {}
 874 };
 875 MODULE_DEVICE_TABLE(of, img_hash_match);
 876
 877 static int img_hash_probe(struct platform_device *pdev)
 878 {
 879         struct img_hash_dev *hdev;
 880         struct device *dev = &pdev->dev;
 881         struct resource *hash_res;
 882         int     irq;
 883         int err;
 884
 885         hdev = devm_kzalloc(dev, sizeof(*hdev), GFP_KERNEL);
 886         if (hdev == NULL)
 887                 return -ENOMEM;
 888
 889         spin_lock_init(&hdev->lock);
 890
 891         hdev->dev = dev;
 892
 893         platform_set_drvdata(pdev, hdev);
 894
 895         INIT_LIST_HEAD(&hdev->list);
 896
 897         tasklet_init(&hdev->done_task, img_hash_done_task, (unsigned long)hdev);
 898         tasklet_init(&hdev->dma_task, img_hash_dma_task, (unsigned long)hdev);
 899
 900         crypto_init_queue(&hdev->queue, IMG_HASH_QUEUE_LENGTH);
 901
 902         /* Register bank */
 903         hash_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 904
 905         hdev->io_base = devm_ioremap_resource(dev, hash_res);
 906         if (IS_ERR(hdev->io_base)) {
 907                 err = PTR_ERR(hdev->io_base);
 908                 dev_err(dev, "can't ioremap, returned %d\n", err);
 909
 910                 goto res_err;
 911         }
 912
 913         /* Write port (DMA or CPU) */
 914         hash_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 915         hdev->cpu_addr = devm_ioremap_resource(dev, hash_res);
 916         if (IS_ERR(hdev->cpu_addr)) {
 917                 dev_err(dev, "can't ioremap write port\n");
 918                 err = PTR_ERR(hdev->cpu_addr);
 919                 goto res_err;
 920         }
 921         hdev->bus_addr = hash_res->start;
 922
 923         irq = platform_get_irq(pdev, 0);
 924         if (irq < 0) {
 925                 dev_err(dev, "no IRQ resource info\n");
 926                 err = irq;
 927                 goto res_err;
 928         }
 929
 930         err = devm_request_irq(dev, irq, img_irq_handler, 0,
 931                                dev_name(dev), hdev);
 932         if (err) {
 933                 dev_err(dev, "unable to request irq\n");
 934                 goto res_err;
 935         }
 936         dev_dbg(dev, "using IRQ channel %d\n", irq);
 937
 938         hdev->hash_clk = devm_clk_get(&pdev->dev, "hash");
 939         if (IS_ERR(hdev->hash_clk)) {
 940                 dev_err(dev, "clock initialization failed.\n");
 941                 err = PTR_ERR(hdev->hash_clk);
 942                 goto res_err;
 943         }
 944
 945         hdev->sys_clk = devm_clk_get(&pdev->dev, "sys");
 946         if (IS_ERR(hdev->sys_clk)) {
 947                 dev_err(dev, "clock initialization failed.\n");
 948                 err = PTR_ERR(hdev->sys_clk);
 949                 goto res_err;
 950         }
 951
 952         err = clk_prepare_enable(hdev->hash_clk);
 953         if (err)
 954                 goto res_err;
 955
 956         err = clk_prepare_enable(hdev->sys_clk);
 957         if (err)
 958                 goto clk_err;
 959
 960         err = img_hash_dma_init(hdev);
 961         if (err)
 962                 goto dma_err;
 963
 964         dev_dbg(dev, "using %s for DMA transfers\n",
 965                 dma_chan_name(hdev->dma_lch));
 966
 967         spin_lock(&img_hash.lock);
 968         list_add_tail(&hdev->list, &img_hash.dev_list);
 969         spin_unlock(&img_hash.lock);
 970
 971         err = img_register_algs(hdev);
 972         if (err)
 973                 goto err_algs;
 974         dev_dbg(dev, "Img MD5/SHA1/SHA224/SHA256 Hardware accelerator initialized\n");
 975
 976         return 0;
 977
 978 err_algs:
 979         spin_lock(&img_hash.lock);
 980         list_del(&hdev->list);
 981         spin_unlock(&img_hash.lock);
 982         dma_release_channel(hdev->dma_lch);
 983 dma_err:
 984         clk_disable_unprepare(hdev->sys_clk);
 985 clk_err:
 986         clk_disable_unprepare(hdev->hash_clk);
 987 res_err:
 988         tasklet_kill(&hdev->done_task);
 989         tasklet_kill(&hdev->dma_task);
 990
 991         return err;
 992 }
 993
 994 static int img_hash_remove(struct platform_device *pdev)
 995 {
 996         static struct img_hash_dev *hdev;
 997
 998         hdev = platform_get_drvdata(pdev);
 999         spin_lock(&img_hash.lock);
1000         list_del(&hdev->list);
1001         spin_unlock(&img_hash.lock);
1002
1003         img_unregister_algs(hdev);
1004
1005         tasklet_kill(&hdev->done_task);
1006         tasklet_kill(&hdev->dma_task);
1007
1008         dma_release_channel(hdev->dma_lch);
1009
1010         clk_disable_unprepare(hdev->hash_clk);
1011         clk_disable_unprepare(hdev->sys_clk);
1012
1013         return 0;
1014 }
1015
1016 static struct platform_driver img_hash_driver = {
1017         .probe          = img_hash_probe,
1018         .remove         = img_hash_remove,
1019         .driver         = {
1020                 .name   = "img-hash-accelerator",
1021                 .of_match_table = of_match_ptr(img_hash_match),
1022         }
1023 };
1024 module_platform_driver(img_hash_driver);
1025
1026 MODULE_LICENSE("GPL v2");
1027 MODULE_DESCRIPTION("Imgtec SHA1/224/256 & MD5 hw accelerator driver");
1028 MODULE_AUTHOR("Will Thomas.");
1029 MODULE_AUTHOR("James Hartley <james.hartley@imgtec.com>");