drivers/crypto/img-hash.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2014 Imagination Technologies
   4  * Authors:  Will Thomas, James Hartley
   5  *
   6  *      Interface structure taken from omap-sham driver
   7  */
   8
   9 #include <linux/clk.h>
  10 #include <linux/dma-mapping.h>
  11 #include <linux/dmaengine.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/io.h>
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/of_device.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/scatterlist.h>
  19
  20 #include <crypto/internal/hash.h>
  21 #include <crypto/md5.h>
  22 #include <crypto/sha1.h>
  23 #include <crypto/sha2.h>
  24
  25 #define CR_RESET                        0
  26 #define CR_RESET_SET                    1
  27 #define CR_RESET_UNSET                  0
  28
  29 #define CR_MESSAGE_LENGTH_H             0x4
  30 #define CR_MESSAGE_LENGTH_L             0x8
  31
  32 #define CR_CONTROL                      0xc
  33 #define CR_CONTROL_BYTE_ORDER_3210      0
  34 #define CR_CONTROL_BYTE_ORDER_0123      1
  35 #define CR_CONTROL_BYTE_ORDER_2310      2
  36 #define CR_CONTROL_BYTE_ORDER_1032      3
  37 #define CR_CONTROL_BYTE_ORDER_SHIFT     8
  38 #define CR_CONTROL_ALGO_MD5     0
  39 #define CR_CONTROL_ALGO_SHA1    1
  40 #define CR_CONTROL_ALGO_SHA224  2
  41 #define CR_CONTROL_ALGO_SHA256  3
  42
  43 #define CR_INTSTAT                      0x10
  44 #define CR_INTENAB                      0x14
  45 #define CR_INTCLEAR                     0x18
  46 #define CR_INT_RESULTS_AVAILABLE        BIT(0)
  47 #define CR_INT_NEW_RESULTS_SET          BIT(1)
  48 #define CR_INT_RESULT_READ_ERR          BIT(2)
  49 #define CR_INT_MESSAGE_WRITE_ERROR      BIT(3)
  50 #define CR_INT_STATUS                   BIT(8)
  51
  52 #define CR_RESULT_QUEUE         0x1c
  53 #define CR_RSD0                         0x40
  54 #define CR_CORE_REV                     0x50
  55 #define CR_CORE_DES1            0x60
  56 #define CR_CORE_DES2            0x70
  57
  58 #define DRIVER_FLAGS_BUSY               BIT(0)
  59 #define DRIVER_FLAGS_FINAL              BIT(1)
  60 #define DRIVER_FLAGS_DMA_ACTIVE         BIT(2)
  61 #define DRIVER_FLAGS_OUTPUT_READY       BIT(3)
  62 #define DRIVER_FLAGS_INIT               BIT(4)
  63 #define DRIVER_FLAGS_CPU                BIT(5)
  64 #define DRIVER_FLAGS_DMA_READY          BIT(6)
  65 #define DRIVER_FLAGS_ERROR              BIT(7)
  66 #define DRIVER_FLAGS_SG                 BIT(8)
  67 #define DRIVER_FLAGS_SHA1               BIT(18)
  68 #define DRIVER_FLAGS_SHA224             BIT(19)
  69 #define DRIVER_FLAGS_SHA256             BIT(20)
  70 #define DRIVER_FLAGS_MD5                BIT(21)
  71
  72 #define IMG_HASH_QUEUE_LENGTH           20
  73 #define IMG_HASH_DMA_BURST              4
  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         struct ahash_request    fallback_req;
 106
 107         /* Zero length buffer must remain last member of struct */
 108         u8 buffer[] __aligned(sizeof(u32));
 109 };
 110
 111 struct img_hash_ctx {
 112         struct img_hash_dev     *hdev;
 113         unsigned long           flags;
 114         struct crypto_ahash     *fallback;
 115 };
 116
 117 struct img_hash_dev {
 118         struct list_head        list;
 119         struct device           *dev;
 120         struct clk              *hash_clk;
 121         struct clk              *sys_clk;
 122         void __iomem            *io_base;
 123
 124         phys_addr_t             bus_addr;
 125         void __iomem            *cpu_addr;
 126
 127         spinlock_t              lock;
 128         int                     err;
 129         struct tasklet_struct   done_task;
 130         struct tasklet_struct   dma_task;
 131
 132         unsigned long           flags;
 133         struct crypto_queue     queue;
 134         struct ahash_request    *req;
 135
 136         struct dma_chan         *dma_lch;
 137 };
 138
 139 struct img_hash_drv {
 140         struct list_head dev_list;
 141         spinlock_t lock;
 142 };
 143
 144 static struct img_hash_drv img_hash = {
 145         .dev_list = LIST_HEAD_INIT(img_hash.dev_list),
 146         .lock = __SPIN_LOCK_UNLOCKED(img_hash.lock),
 147 };
 148
 149 static inline u32 img_hash_read(struct img_hash_dev *hdev, u32 offset)
 150 {
 151         return readl_relaxed(hdev->io_base + offset);
 152 }
 153
 154 static inline void img_hash_write(struct img_hash_dev *hdev,
 155                                   u32 offset, u32 value)
 156 {
 157         writel_relaxed(value, hdev->io_base + offset);
 158 }
 159
 160 static inline __be32 img_hash_read_result_queue(struct img_hash_dev *hdev)
 161 {
 162         return cpu_to_be32(img_hash_read(hdev, CR_RESULT_QUEUE));
 163 }
 164
 165 static void img_hash_start(struct img_hash_dev *hdev, bool dma)
 166 {
 167         struct img_hash_request_ctx *ctx = ahash_request_ctx(hdev->req);
 168         u32 cr = IMG_HASH_BYTE_ORDER << CR_CONTROL_BYTE_ORDER_SHIFT;
 169
 170         if (ctx->flags & DRIVER_FLAGS_MD5)
 171                 cr |= CR_CONTROL_ALGO_MD5;
 172         else if (ctx->flags & DRIVER_FLAGS_SHA1)
 173                 cr |= CR_CONTROL_ALGO_SHA1;
 174         else if (ctx->flags & DRIVER_FLAGS_SHA224)
 175                 cr |= CR_CONTROL_ALGO_SHA224;
 176         else if (ctx->flags & DRIVER_FLAGS_SHA256)
 177                 cr |= CR_CONTROL_ALGO_SHA256;
 178         dev_dbg(hdev->dev, "Starting hash process\n");
 179         img_hash_write(hdev, CR_CONTROL, cr);
 180
 181         /*
 182          * The hardware block requires two cycles between writing the control
 183          * register and writing the first word of data in non DMA mode, to
 184          * ensure the first data write is not grouped in burst with the control
 185          * register write a read is issued to 'flush' the bus.
 186          */
 187         if (!dma)
 188                 img_hash_read(hdev, CR_CONTROL);
 189 }
 190
 191 static int img_hash_xmit_cpu(struct img_hash_dev *hdev, const u8 *buf,
 192                              size_t length, int final)
 193 {
 194         u32 count, len32;
 195         const u32 *buffer = (const u32 *)buf;
 196
 197         dev_dbg(hdev->dev, "xmit_cpu:  length: %zu bytes\n", length);
 198
 199         if (final)
 200                 hdev->flags |= DRIVER_FLAGS_FINAL;
 201
 202         len32 = DIV_ROUND_UP(length, sizeof(u32));
 203
 204         for (count = 0; count < len32; count++)
 205                 writel_relaxed(buffer[count], hdev->cpu_addr);
 206
 207         return -EINPROGRESS;
 208 }
 209
 210 static void img_hash_dma_callback(void *data)
 211 {
 212         struct img_hash_dev *hdev = (struct img_hash_dev *)data;
 213         struct img_hash_request_ctx *ctx = ahash_request_ctx(hdev->req);
 214
 215         if (ctx->bufcnt) {
 216                 img_hash_xmit_cpu(hdev, ctx->buffer, ctx->bufcnt, 0);
 217                 ctx->bufcnt = 0;
 218         }
 219         if (ctx->sg)
 220                 tasklet_schedule(&hdev->dma_task);
 221 }
 222
 223 static int img_hash_xmit_dma(struct img_hash_dev *hdev, struct scatterlist *sg)
 224 {
 225         struct dma_async_tx_descriptor *desc;
 226         struct img_hash_request_ctx *ctx = ahash_request_ctx(hdev->req);
 227
 228         ctx->dma_ct = dma_map_sg(hdev->dev, sg, 1, DMA_TO_DEVICE);
 229         if (ctx->dma_ct == 0) {
 230                 dev_err(hdev->dev, "Invalid DMA sg\n");
 231                 hdev->err = -EINVAL;
 232                 return -EINVAL;
 233         }
 234
 235         desc = dmaengine_prep_slave_sg(hdev->dma_lch,
 236                                        sg,
 237                                        ctx->dma_ct,
 238                                        DMA_MEM_TO_DEV,
 239                                        DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 240         if (!desc) {
 241                 dev_err(hdev->dev, "Null DMA descriptor\n");
 242                 hdev->err = -EINVAL;
 243                 dma_unmap_sg(hdev->dev, sg, 1, DMA_TO_DEVICE);
 244                 return -EINVAL;
 245         }
 246         desc->callback = img_hash_dma_callback;
 247         desc->callback_param = hdev;
 248         dmaengine_submit(desc);
 249         dma_async_issue_pending(hdev->dma_lch);
 250
 251         return 0;
 252 }
 253
 254 static int img_hash_write_via_cpu(struct img_hash_dev *hdev)
 255 {
 256         struct img_hash_request_ctx *ctx = ahash_request_ctx(hdev->req);
 257
 258         ctx->bufcnt = sg_copy_to_buffer(hdev->req->src, sg_nents(ctx->sg),
 259                                         ctx->buffer, hdev->req->nbytes);
 260
 261         ctx->total = hdev->req->nbytes;
 262         ctx->bufcnt = 0;
 263
 264         hdev->flags |= (DRIVER_FLAGS_CPU | DRIVER_FLAGS_FINAL);
 265
 266         img_hash_start(hdev, false);
 267
 268         return img_hash_xmit_cpu(hdev, ctx->buffer, ctx->total, 1);
 269 }
 270
 271 static int img_hash_finish(struct ahash_request *req)
 272 {
 273         struct img_hash_request_ctx *ctx = ahash_request_ctx(req);
 274
 275         if (!req->result)
 276                 return -EINVAL;
 277
 278         memcpy(req->result, ctx->digest, ctx->digsize);
 279
 280         return 0;
 281 }
 282
 283 static void img_hash_copy_hash(struct ahash_request *req)
 284 {
 285         struct img_hash_request_ctx *ctx = ahash_request_ctx(req);
 286         __be32 *hash = (__be32 *)ctx->digest;
 287         int i;
 288
 289         for (i = (ctx->digsize / sizeof(*hash)) - 1; i >= 0; i--)
 290                 hash[i] = img_hash_read_result_queue(ctx->hdev);
 291 }
 292
 293 static void img_hash_finish_req(struct ahash_request *req, int err)
 294 {
 295         struct img_hash_request_ctx *ctx = ahash_request_ctx(req);
 296         struct img_hash_dev *hdev =  ctx->hdev;
 297
 298         if (!err) {
 299                 img_hash_copy_hash(req);
 300                 if (DRIVER_FLAGS_FINAL & hdev->flags)
 301                         err = img_hash_finish(req);
 302         } else {
 303                 dev_warn(hdev->dev, "Hash failed with error %d\n", err);
 304                 ctx->flags |= DRIVER_FLAGS_ERROR;
 305         }
 306
 307         hdev->flags &= ~(DRIVER_FLAGS_DMA_READY | DRIVER_FLAGS_OUTPUT_READY |
 308                 DRIVER_FLAGS_CPU | DRIVER_FLAGS_BUSY | DRIVER_FLAGS_FINAL);
 309
 310         if (req->base.complete)
 311                 ahash_request_complete(req, err);
 312 }
 313
 314 static int img_hash_write_via_dma(struct img_hash_dev *hdev)
 315 {
 316         struct img_hash_request_ctx *ctx = ahash_request_ctx(hdev->req);
 317
 318         img_hash_start(hdev, true);
 319
 320         dev_dbg(hdev->dev, "xmit dma size: %d\n", ctx->total);
 321
 322         if (!ctx->total)
 323                 hdev->flags |= DRIVER_FLAGS_FINAL;
 324
 325         hdev->flags |= DRIVER_FLAGS_DMA_ACTIVE | DRIVER_FLAGS_FINAL;
 326
 327         tasklet_schedule(&hdev->dma_task);
 328
 329         return -EINPROGRESS;
 330 }
 331
 332 static int img_hash_dma_init(struct img_hash_dev *hdev)
 333 {
 334         struct dma_slave_config dma_conf;
 335         int err;
 336
 337         hdev->dma_lch = dma_request_chan(hdev->dev, "tx");
 338         if (IS_ERR(hdev->dma_lch)) {
 339                 dev_err(hdev->dev, "Couldn't acquire a slave DMA channel.\n");
 340                 return PTR_ERR(hdev->dma_lch);
 341         }
 342         dma_conf.direction = DMA_MEM_TO_DEV;
 343         dma_conf.dst_addr = hdev->bus_addr;
 344         dma_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 345         dma_conf.dst_maxburst = IMG_HASH_DMA_BURST;
 346         dma_conf.device_fc = false;
 347
 348         err = dmaengine_slave_config(hdev->dma_lch,  &dma_conf);
 349         if (err) {
 350                 dev_err(hdev->dev, "Couldn't configure DMA slave.\n");
 351                 dma_release_channel(hdev->dma_lch);
 352                 return err;
 353         }
 354
 355         return 0;
 356 }
 357
 358 static void img_hash_dma_task(unsigned long d)
 359 {
 360         struct img_hash_dev *hdev = (struct img_hash_dev *)d;
 361         struct img_hash_request_ctx *ctx;
 362         u8 *addr;
 363         size_t nbytes, bleft, wsend, len, tbc;
 364         struct scatterlist tsg;
 365
 366         if (!hdev->req)
 367                 return;
 368
 369         ctx = ahash_request_ctx(hdev->req);
 370         if (!ctx->sg)
 371                 return;
 372
 373         addr = sg_virt(ctx->sg);
 374         nbytes = ctx->sg->length - ctx->offset;
 375
 376         /*
 377          * The hash accelerator does not support a data valid mask. This means
 378          * that if each dma (i.e. per page) is not a multiple of 4 bytes, the
 379          * padding bytes in the last word written by that dma would erroneously
 380          * be included in the hash. To avoid this we round down the transfer,
 381          * and add the excess to the start of the next dma. It does not matter
 382          * that the final dma may not be a multiple of 4 bytes as the hashing
 383          * block is programmed to accept the correct number of bytes.
 384          */
 385
 386         bleft = nbytes % 4;
 387         wsend = (nbytes / 4);
 388
 389         if (wsend) {
 390                 sg_init_one(&tsg, addr + ctx->offset, wsend * 4);
 391                 if (img_hash_xmit_dma(hdev, &tsg)) {
 392                         dev_err(hdev->dev, "DMA failed, falling back to CPU");
 393                         ctx->flags |= DRIVER_FLAGS_CPU;
 394                         hdev->err = 0;
 395                         img_hash_xmit_cpu(hdev, addr + ctx->offset,
 396                                           wsend * 4, 0);
 397                         ctx->sent += wsend * 4;
 398                         wsend = 0;
 399                 } else {
 400                         ctx->sent += wsend * 4;
 401                 }
 402         }
 403
 404         if (bleft) {
 405                 ctx->bufcnt = sg_pcopy_to_buffer(ctx->sgfirst, ctx->nents,
 406                                                  ctx->buffer, bleft, ctx->sent);
 407                 tbc = 0;
 408                 ctx->sg = sg_next(ctx->sg);
 409                 while (ctx->sg && (ctx->bufcnt < 4)) {
 410                         len = ctx->sg->length;
 411                         if (likely(len > (4 - ctx->bufcnt)))
 412                                 len = 4 - ctx->bufcnt;
 413                         tbc = sg_pcopy_to_buffer(ctx->sgfirst, ctx->nents,
 414                                                  ctx->buffer + ctx->bufcnt, len,
 415                                         ctx->sent + ctx->bufcnt);
 416                         ctx->bufcnt += tbc;
 417                         if (tbc >= ctx->sg->length) {
 418                                 ctx->sg = sg_next(ctx->sg);
 419                                 tbc = 0;
 420                         }
 421                 }
 422
 423                 ctx->sent += ctx->bufcnt;
 424                 ctx->offset = tbc;
 425
 426                 if (!wsend)
 427                         img_hash_dma_callback(hdev);
 428         } else {
 429                 ctx->offset = 0;
 430                 ctx->sg = sg_next(ctx->sg);
 431         }
 432 }
 433
 434 static int img_hash_write_via_dma_stop(struct img_hash_dev *hdev)
 435 {
 436         struct img_hash_request_ctx *ctx = ahash_request_ctx(hdev->req);
 437
 438         if (ctx->flags & DRIVER_FLAGS_SG)
 439                 dma_unmap_sg(hdev->dev, ctx->sg, ctx->dma_ct, DMA_TO_DEVICE);
 440
 441         return 0;
 442 }
 443
 444 static int img_hash_process_data(struct img_hash_dev *hdev)
 445 {
 446         struct ahash_request *req = hdev->req;
 447         struct img_hash_request_ctx *ctx = ahash_request_ctx(req);
 448         int err = 0;
 449
 450         ctx->bufcnt = 0;
 451
 452         if (req->nbytes >= IMG_HASH_DMA_THRESHOLD) {
 453                 dev_dbg(hdev->dev, "process data request(%d bytes) using DMA\n",
 454                         req->nbytes);
 455                 err = img_hash_write_via_dma(hdev);
 456         } else {
 457                 dev_dbg(hdev->dev, "process data request(%d bytes) using CPU\n",
 458                         req->nbytes);
 459                 err = img_hash_write_via_cpu(hdev);
 460         }
 461         return err;
 462 }
 463
 464 static int img_hash_hw_init(struct img_hash_dev *hdev)
 465 {
 466         unsigned long long nbits;
 467         u32 u, l;
 468
 469         img_hash_write(hdev, CR_RESET, CR_RESET_SET);
 470         img_hash_write(hdev, CR_RESET, CR_RESET_UNSET);
 471         img_hash_write(hdev, CR_INTENAB, CR_INT_NEW_RESULTS_SET);
 472
 473         nbits = (u64)hdev->req->nbytes << 3;
 474         u = nbits >> 32;
 475         l = nbits;
 476         img_hash_write(hdev, CR_MESSAGE_LENGTH_H, u);
 477         img_hash_write(hdev, CR_MESSAGE_LENGTH_L, l);
 478
 479         if (!(DRIVER_FLAGS_INIT & hdev->flags)) {
 480                 hdev->flags |= DRIVER_FLAGS_INIT;
 481                 hdev->err = 0;
 482         }
 483         dev_dbg(hdev->dev, "hw initialized, nbits: %llx\n", nbits);
 484         return 0;
 485 }
 486
 487 static int img_hash_init(struct ahash_request *req)
 488 {
 489         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 490         struct img_hash_request_ctx *rctx = ahash_request_ctx(req);
 491         struct img_hash_ctx *ctx = crypto_ahash_ctx(tfm);
 492
 493         ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback);
 494         rctx->fallback_req.base.flags = req->base.flags
 495                 & CRYPTO_TFM_REQ_MAY_SLEEP;
 496
 497         return crypto_ahash_init(&rctx->fallback_req);
 498 }
 499
 500 static int img_hash_handle_queue(struct img_hash_dev *hdev,
 501                                  struct ahash_request *req)
 502 {
 503         struct crypto_async_request *async_req, *backlog;
 504         struct img_hash_request_ctx *ctx;
 505         unsigned long flags;
 506         int err = 0, res = 0;
 507
 508         spin_lock_irqsave(&hdev->lock, flags);
 509
 510         if (req)
 511                 res = ahash_enqueue_request(&hdev->queue, req);
 512
 513         if (DRIVER_FLAGS_BUSY & hdev->flags) {
 514                 spin_unlock_irqrestore(&hdev->lock, flags);
 515                 return res;
 516         }
 517
 518         backlog = crypto_get_backlog(&hdev->queue);
 519         async_req = crypto_dequeue_request(&hdev->queue);
 520         if (async_req)
 521                 hdev->flags |= DRIVER_FLAGS_BUSY;
 522
 523         spin_unlock_irqrestore(&hdev->lock, flags);
 524
 525         if (!async_req)
 526                 return res;
 527
 528         if (backlog)
 529                 crypto_request_complete(backlog, -EINPROGRESS);
 530
 531         req = ahash_request_cast(async_req);
 532         hdev->req = req;
 533
 534         ctx = ahash_request_ctx(req);
 535
 536         dev_info(hdev->dev, "processing req, op: %lu, bytes: %d\n",
 537                  ctx->op, req->nbytes);
 538
 539         err = img_hash_hw_init(hdev);
 540
 541         if (!err)
 542                 err = img_hash_process_data(hdev);
 543
 544         if (err != -EINPROGRESS) {
 545                 /* done_task will not finish so do it here */
 546                 img_hash_finish_req(req, err);
 547         }
 548         return res;
 549 }
 550
 551 static int img_hash_update(struct ahash_request *req)
 552 {
 553         struct img_hash_request_ctx *rctx = ahash_request_ctx(req);
 554         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 555         struct img_hash_ctx *ctx = crypto_ahash_ctx(tfm);
 556
 557         ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback);
 558         rctx->fallback_req.base.flags = req->base.flags
 559                 & CRYPTO_TFM_REQ_MAY_SLEEP;
 560         rctx->fallback_req.nbytes = req->nbytes;
 561         rctx->fallback_req.src = req->src;
 562
 563         return crypto_ahash_update(&rctx->fallback_req);
 564 }
 565
 566 static int img_hash_final(struct ahash_request *req)
 567 {
 568         struct img_hash_request_ctx *rctx = ahash_request_ctx(req);
 569         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 570         struct img_hash_ctx *ctx = crypto_ahash_ctx(tfm);
 571
 572         ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback);
 573         rctx->fallback_req.base.flags = req->base.flags
 574                 & CRYPTO_TFM_REQ_MAY_SLEEP;
 575         rctx->fallback_req.result = req->result;
 576
 577         return crypto_ahash_final(&rctx->fallback_req);
 578 }
 579
 580 static int img_hash_finup(struct ahash_request *req)
 581 {
 582         struct img_hash_request_ctx *rctx = ahash_request_ctx(req);
 583         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 584         struct img_hash_ctx *ctx = crypto_ahash_ctx(tfm);
 585
 586         ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback);
 587         rctx->fallback_req.base.flags = req->base.flags
 588                 & CRYPTO_TFM_REQ_MAY_SLEEP;
 589         rctx->fallback_req.nbytes = req->nbytes;
 590         rctx->fallback_req.src = req->src;
 591         rctx->fallback_req.result = req->result;
 592
 593         return crypto_ahash_finup(&rctx->fallback_req);
 594 }
 595
 596 static int img_hash_import(struct ahash_request *req, const void *in)
 597 {
 598         struct img_hash_request_ctx *rctx = ahash_request_ctx(req);
 599         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 600         struct img_hash_ctx *ctx = crypto_ahash_ctx(tfm);
 601
 602         ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback);
 603         rctx->fallback_req.base.flags = req->base.flags
 604                 & CRYPTO_TFM_REQ_MAY_SLEEP;
 605
 606         return crypto_ahash_import(&rctx->fallback_req, in);
 607 }
 608
 609 static int img_hash_export(struct ahash_request *req, void *out)
 610 {
 611         struct img_hash_request_ctx *rctx = ahash_request_ctx(req);
 612         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 613         struct img_hash_ctx *ctx = crypto_ahash_ctx(tfm);
 614
 615         ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback);
 616         rctx->fallback_req.base.flags = req->base.flags
 617                 & CRYPTO_TFM_REQ_MAY_SLEEP;
 618
 619         return crypto_ahash_export(&rctx->fallback_req, out);
 620 }
 621
 622 static int img_hash_digest(struct ahash_request *req)
 623 {
 624         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 625         struct img_hash_ctx *tctx = crypto_ahash_ctx(tfm);
 626         struct img_hash_request_ctx *ctx = ahash_request_ctx(req);
 627         struct img_hash_dev *hdev = NULL;
 628         struct img_hash_dev *tmp;
 629         int err;
 630
 631         spin_lock(&img_hash.lock);
 632         if (!tctx->hdev) {
 633                 list_for_each_entry(tmp, &img_hash.dev_list, list) {
 634                         hdev = tmp;
 635                         break;
 636                 }
 637                 tctx->hdev = hdev;
 638
 639         } else {
 640                 hdev = tctx->hdev;
 641         }
 642
 643         spin_unlock(&img_hash.lock);
 644         ctx->hdev = hdev;
 645         ctx->flags = 0;
 646         ctx->digsize = crypto_ahash_digestsize(tfm);
 647
 648         switch (ctx->digsize) {
 649         case SHA1_DIGEST_SIZE:
 650                 ctx->flags |= DRIVER_FLAGS_SHA1;
 651                 break;
 652         case SHA256_DIGEST_SIZE:
 653                 ctx->flags |= DRIVER_FLAGS_SHA256;
 654                 break;
 655         case SHA224_DIGEST_SIZE:
 656                 ctx->flags |= DRIVER_FLAGS_SHA224;
 657                 break;
 658         case MD5_DIGEST_SIZE:
 659                 ctx->flags |= DRIVER_FLAGS_MD5;
 660                 break;
 661         default:
 662                 return -EINVAL;
 663         }
 664
 665         ctx->bufcnt = 0;
 666         ctx->offset = 0;
 667         ctx->sent = 0;
 668         ctx->total = req->nbytes;
 669         ctx->sg = req->src;
 670         ctx->sgfirst = req->src;
 671         ctx->nents = sg_nents(ctx->sg);
 672
 673         err = img_hash_handle_queue(tctx->hdev, req);
 674
 675         return err;
 676 }
 677
 678 static int img_hash_cra_init(struct crypto_tfm *tfm, const char *alg_name)
 679 {
 680         struct img_hash_ctx *ctx = crypto_tfm_ctx(tfm);
 681
 682         ctx->fallback = crypto_alloc_ahash(alg_name, 0,
 683                                            CRYPTO_ALG_NEED_FALLBACK);
 684         if (IS_ERR(ctx->fallback)) {
 685                 pr_err("img_hash: Could not load fallback driver.\n");
 686                 return PTR_ERR(ctx->fallback);
 687         }
 688         crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
 689                                  sizeof(struct img_hash_request_ctx) +
 690                                  crypto_ahash_reqsize(ctx->fallback) +
 691                                  IMG_HASH_DMA_THRESHOLD);
 692
 693         return 0;
 694 }
 695
 696 static int img_hash_cra_md5_init(struct crypto_tfm *tfm)
 697 {
 698         return img_hash_cra_init(tfm, "md5-generic");
 699 }
 700
 701 static int img_hash_cra_sha1_init(struct crypto_tfm *tfm)
 702 {
 703         return img_hash_cra_init(tfm, "sha1-generic");
 704 }
 705
 706 static int img_hash_cra_sha224_init(struct crypto_tfm *tfm)
 707 {
 708         return img_hash_cra_init(tfm, "sha224-generic");
 709 }
 710
 711 static int img_hash_cra_sha256_init(struct crypto_tfm *tfm)
 712 {
 713         return img_hash_cra_init(tfm, "sha256-generic");
 714 }
 715
 716 static void img_hash_cra_exit(struct crypto_tfm *tfm)
 717 {
 718         struct img_hash_ctx *tctx = crypto_tfm_ctx(tfm);
 719
 720         crypto_free_ahash(tctx->fallback);
 721 }
 722
 723 static irqreturn_t img_irq_handler(int irq, void *dev_id)
 724 {
 725         struct img_hash_dev *hdev = dev_id;
 726         u32 reg;
 727
 728         reg = img_hash_read(hdev, CR_INTSTAT);
 729         img_hash_write(hdev, CR_INTCLEAR, reg);
 730
 731         if (reg & CR_INT_NEW_RESULTS_SET) {
 732                 dev_dbg(hdev->dev, "IRQ CR_INT_NEW_RESULTS_SET\n");
 733                 if (DRIVER_FLAGS_BUSY & hdev->flags) {
 734                         hdev->flags |= DRIVER_FLAGS_OUTPUT_READY;
 735                         if (!(DRIVER_FLAGS_CPU & hdev->flags))
 736                                 hdev->flags |= DRIVER_FLAGS_DMA_READY;
 737                         tasklet_schedule(&hdev->done_task);
 738                 } else {
 739                         dev_warn(hdev->dev,
 740                                  "HASH interrupt when no active requests.\n");
 741                 }
 742         } else if (reg & CR_INT_RESULTS_AVAILABLE) {
 743                 dev_warn(hdev->dev,
 744                          "IRQ triggered before the hash had completed\n");
 745         } else if (reg & CR_INT_RESULT_READ_ERR) {
 746                 dev_warn(hdev->dev,
 747                          "Attempt to read from an empty result queue\n");
 748         } else if (reg & CR_INT_MESSAGE_WRITE_ERROR) {
 749                 dev_warn(hdev->dev,
 750                          "Data written before the hardware was configured\n");
 751         }
 752         return IRQ_HANDLED;
 753 }
 754
 755 static struct ahash_alg img_algs[] = {
 756         {
 757                 .init = img_hash_init,
 758                 .update = img_hash_update,
 759                 .final = img_hash_final,
 760                 .finup = img_hash_finup,
 761                 .export = img_hash_export,
 762                 .import = img_hash_import,
 763                 .digest = img_hash_digest,
 764                 .halg = {
 765                         .digestsize = MD5_DIGEST_SIZE,
 766                         .statesize = sizeof(struct md5_state),
 767                         .base = {
 768                                 .cra_name = "md5",
 769                                 .cra_driver_name = "img-md5",
 770                                 .cra_priority = 300,
 771                                 .cra_flags =
 772                                 CRYPTO_ALG_ASYNC |
 773                                 CRYPTO_ALG_NEED_FALLBACK,
 774                                 .cra_blocksize = MD5_HMAC_BLOCK_SIZE,
 775                                 .cra_ctxsize = sizeof(struct img_hash_ctx),
 776                                 .cra_init = img_hash_cra_md5_init,
 777                                 .cra_exit = img_hash_cra_exit,
 778                                 .cra_module = THIS_MODULE,
 779                         }
 780                 }
 781         },
 782         {
 783                 .init = img_hash_init,
 784                 .update = img_hash_update,
 785                 .final = img_hash_final,
 786                 .finup = img_hash_finup,
 787                 .export = img_hash_export,
 788                 .import = img_hash_import,
 789                 .digest = img_hash_digest,
 790                 .halg = {
 791                         .digestsize = SHA1_DIGEST_SIZE,
 792                         .statesize = sizeof(struct sha1_state),
 793                         .base = {
 794                                 .cra_name = "sha1",
 795                                 .cra_driver_name = "img-sha1",
 796                                 .cra_priority = 300,
 797                                 .cra_flags =
 798                                 CRYPTO_ALG_ASYNC |
 799                                 CRYPTO_ALG_NEED_FALLBACK,
 800                                 .cra_blocksize = SHA1_BLOCK_SIZE,
 801                                 .cra_ctxsize = sizeof(struct img_hash_ctx),
 802                                 .cra_init = img_hash_cra_sha1_init,
 803                                 .cra_exit = img_hash_cra_exit,
 804                                 .cra_module = THIS_MODULE,
 805                         }
 806                 }
 807         },
 808         {
 809                 .init = img_hash_init,
 810                 .update = img_hash_update,
 811                 .final = img_hash_final,
 812                 .finup = img_hash_finup,
 813                 .export = img_hash_export,
 814                 .import = img_hash_import,
 815                 .digest = img_hash_digest,
 816                 .halg = {
 817                         .digestsize = SHA224_DIGEST_SIZE,
 818                         .statesize = sizeof(struct sha256_state),
 819                         .base = {
 820                                 .cra_name = "sha224",
 821                                 .cra_driver_name = "img-sha224",
 822                                 .cra_priority = 300,
 823                                 .cra_flags =
 824                                 CRYPTO_ALG_ASYNC |
 825                                 CRYPTO_ALG_NEED_FALLBACK,
 826                                 .cra_blocksize = SHA224_BLOCK_SIZE,
 827                                 .cra_ctxsize = sizeof(struct img_hash_ctx),
 828                                 .cra_init = img_hash_cra_sha224_init,
 829                                 .cra_exit = img_hash_cra_exit,
 830                                 .cra_module = THIS_MODULE,
 831                         }
 832                 }
 833         },
 834         {
 835                 .init = img_hash_init,
 836                 .update = img_hash_update,
 837                 .final = img_hash_final,
 838                 .finup = img_hash_finup,
 839                 .export = img_hash_export,
 840                 .import = img_hash_import,
 841                 .digest = img_hash_digest,
 842                 .halg = {
 843                         .digestsize = SHA256_DIGEST_SIZE,
 844                         .statesize = sizeof(struct sha256_state),
 845                         .base = {
 846                                 .cra_name = "sha256",
 847                                 .cra_driver_name = "img-sha256",
 848                                 .cra_priority = 300,
 849                                 .cra_flags =
 850                                 CRYPTO_ALG_ASYNC |
 851                                 CRYPTO_ALG_NEED_FALLBACK,
 852                                 .cra_blocksize = SHA256_BLOCK_SIZE,
 853                                 .cra_ctxsize = sizeof(struct img_hash_ctx),
 854                                 .cra_init = img_hash_cra_sha256_init,
 855                                 .cra_exit = img_hash_cra_exit,
 856                                 .cra_module = THIS_MODULE,
 857                         }
 858                 }
 859         }
 860 };
 861
 862 static int img_register_algs(struct img_hash_dev *hdev)
 863 {
 864         int i, err;
 865
 866         for (i = 0; i < ARRAY_SIZE(img_algs); i++) {
 867                 err = crypto_register_ahash(&img_algs[i]);
 868                 if (err)
 869                         goto err_reg;
 870         }
 871         return 0;
 872
 873 err_reg:
 874         for (; i--; )
 875                 crypto_unregister_ahash(&img_algs[i]);
 876
 877         return err;
 878 }
 879
 880 static int img_unregister_algs(struct img_hash_dev *hdev)
 881 {
 882         int i;
 883
 884         for (i = 0; i < ARRAY_SIZE(img_algs); i++)
 885                 crypto_unregister_ahash(&img_algs[i]);
 886         return 0;
 887 }
 888
 889 static void img_hash_done_task(unsigned long data)
 890 {
 891         struct img_hash_dev *hdev = (struct img_hash_dev *)data;
 892         int err = 0;
 893
 894         if (hdev->err == -EINVAL) {
 895                 err = hdev->err;
 896                 goto finish;
 897         }
 898
 899         if (!(DRIVER_FLAGS_BUSY & hdev->flags)) {
 900                 img_hash_handle_queue(hdev, NULL);
 901                 return;
 902         }
 903
 904         if (DRIVER_FLAGS_CPU & hdev->flags) {
 905                 if (DRIVER_FLAGS_OUTPUT_READY & hdev->flags) {
 906                         hdev->flags &= ~DRIVER_FLAGS_OUTPUT_READY;
 907                         goto finish;
 908                 }
 909         } else if (DRIVER_FLAGS_DMA_READY & hdev->flags) {
 910                 if (DRIVER_FLAGS_DMA_ACTIVE & hdev->flags) {
 911                         hdev->flags &= ~DRIVER_FLAGS_DMA_ACTIVE;
 912                         img_hash_write_via_dma_stop(hdev);
 913                         if (hdev->err) {
 914                                 err = hdev->err;
 915                                 goto finish;
 916                         }
 917                 }
 918                 if (DRIVER_FLAGS_OUTPUT_READY & hdev->flags) {
 919                         hdev->flags &= ~(DRIVER_FLAGS_DMA_READY |
 920                                         DRIVER_FLAGS_OUTPUT_READY);
 921                         goto finish;
 922                 }
 923         }
 924         return;
 925
 926 finish:
 927         img_hash_finish_req(hdev->req, err);
 928 }
 929
 930 static const struct of_device_id img_hash_match[] = {
 931         { .compatible = "img,hash-accelerator" },
 932         {}
 933 };
 934 MODULE_DEVICE_TABLE(of, img_hash_match);
 935
 936 static int img_hash_probe(struct platform_device *pdev)
 937 {
 938         struct img_hash_dev *hdev;
 939         struct device *dev = &pdev->dev;
 940         struct resource *hash_res;
 941         int     irq;
 942         int err;
 943
 944         hdev = devm_kzalloc(dev, sizeof(*hdev), GFP_KERNEL);
 945         if (hdev == NULL)
 946                 return -ENOMEM;
 947
 948         spin_lock_init(&hdev->lock);
 949
 950         hdev->dev = dev;
 951
 952         platform_set_drvdata(pdev, hdev);
 953
 954         INIT_LIST_HEAD(&hdev->list);
 955
 956         tasklet_init(&hdev->done_task, img_hash_done_task, (unsigned long)hdev);
 957         tasklet_init(&hdev->dma_task, img_hash_dma_task, (unsigned long)hdev);
 958
 959         crypto_init_queue(&hdev->queue, IMG_HASH_QUEUE_LENGTH);
 960
 961         /* Register bank */
 962         hdev->io_base = devm_platform_ioremap_resource(pdev, 0);
 963         if (IS_ERR(hdev->io_base)) {
 964                 err = PTR_ERR(hdev->io_base);
 965                 goto res_err;
 966         }
 967
 968         /* Write port (DMA or CPU) */
 969         hash_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 970         hdev->cpu_addr = devm_ioremap_resource(dev, hash_res);
 971         if (IS_ERR(hdev->cpu_addr)) {
 972                 err = PTR_ERR(hdev->cpu_addr);
 973                 goto res_err;
 974         }
 975         hdev->bus_addr = hash_res->start;
 976
 977         irq = platform_get_irq(pdev, 0);
 978         if (irq < 0) {
 979                 err = irq;
 980                 goto res_err;
 981         }
 982
 983         err = devm_request_irq(dev, irq, img_irq_handler, 0,
 984                                dev_name(dev), hdev);
 985         if (err) {
 986                 dev_err(dev, "unable to request irq\n");
 987                 goto res_err;
 988         }
 989         dev_dbg(dev, "using IRQ channel %d\n", irq);
 990
 991         hdev->hash_clk = devm_clk_get(&pdev->dev, "hash");
 992         if (IS_ERR(hdev->hash_clk)) {
 993                 dev_err(dev, "clock initialization failed.\n");
 994                 err = PTR_ERR(hdev->hash_clk);
 995                 goto res_err;
 996         }
 997
 998         hdev->sys_clk = devm_clk_get(&pdev->dev, "sys");
 999         if (IS_ERR(hdev->sys_clk)) {
1000                 dev_err(dev, "clock initialization failed.\n");
1001                 err = PTR_ERR(hdev->sys_clk);
1002                 goto res_err;
1003         }
1004
1005         err = clk_prepare_enable(hdev->hash_clk);
1006         if (err)
1007                 goto res_err;
1008
1009         err = clk_prepare_enable(hdev->sys_clk);
1010         if (err)
1011                 goto clk_err;
1012
1013         err = img_hash_dma_init(hdev);
1014         if (err)
1015                 goto dma_err;
1016
1017         dev_dbg(dev, "using %s for DMA transfers\n",
1018                 dma_chan_name(hdev->dma_lch));
1019
1020         spin_lock(&img_hash.lock);
1021         list_add_tail(&hdev->list, &img_hash.dev_list);
1022         spin_unlock(&img_hash.lock);
1023
1024         err = img_register_algs(hdev);
1025         if (err)
1026                 goto err_algs;
1027         dev_info(dev, "Img MD5/SHA1/SHA224/SHA256 Hardware accelerator initialized\n");
1028
1029         return 0;
1030
1031 err_algs:
1032         spin_lock(&img_hash.lock);
1033         list_del(&hdev->list);
1034         spin_unlock(&img_hash.lock);
1035         dma_release_channel(hdev->dma_lch);
1036 dma_err:
1037         clk_disable_unprepare(hdev->sys_clk);
1038 clk_err:
1039         clk_disable_unprepare(hdev->hash_clk);
1040 res_err:
1041         tasklet_kill(&hdev->done_task);
1042         tasklet_kill(&hdev->dma_task);
1043
1044         return err;
1045 }
1046
1047 static int img_hash_remove(struct platform_device *pdev)
1048 {
1049         struct img_hash_dev *hdev;
1050
1051         hdev = platform_get_drvdata(pdev);
1052         spin_lock(&img_hash.lock);
1053         list_del(&hdev->list);
1054         spin_unlock(&img_hash.lock);
1055
1056         img_unregister_algs(hdev);
1057
1058         tasklet_kill(&hdev->done_task);
1059         tasklet_kill(&hdev->dma_task);
1060
1061         dma_release_channel(hdev->dma_lch);
1062
1063         clk_disable_unprepare(hdev->hash_clk);
1064         clk_disable_unprepare(hdev->sys_clk);
1065
1066         return 0;
1067 }
1068
1069 #ifdef CONFIG_PM_SLEEP
1070 static int img_hash_suspend(struct device *dev)
1071 {
1072         struct img_hash_dev *hdev = dev_get_drvdata(dev);
1073
1074         clk_disable_unprepare(hdev->hash_clk);
1075         clk_disable_unprepare(hdev->sys_clk);
1076
1077         return 0;
1078 }
1079
1080 static int img_hash_resume(struct device *dev)
1081 {
1082         struct img_hash_dev *hdev = dev_get_drvdata(dev);
1083         int ret;
1084
1085         ret = clk_prepare_enable(hdev->hash_clk);
1086         if (ret)
1087                 return ret;
1088
1089         ret = clk_prepare_enable(hdev->sys_clk);
1090         if (ret) {
1091                 clk_disable_unprepare(hdev->hash_clk);
1092                 return ret;
1093         }
1094
1095         return 0;
1096 }
1097 #endif /* CONFIG_PM_SLEEP */
1098
1099 static const struct dev_pm_ops img_hash_pm_ops = {
1100         SET_SYSTEM_SLEEP_PM_OPS(img_hash_suspend, img_hash_resume)
1101 };
1102
1103 static struct platform_driver img_hash_driver = {
1104         .probe          = img_hash_probe,
1105         .remove         = img_hash_remove,
1106         .driver         = {
1107                 .name   = "img-hash-accelerator",
1108                 .pm     = &img_hash_pm_ops,
1109                 .of_match_table = of_match_ptr(img_hash_match),
1110         }
1111 };
1112 module_platform_driver(img_hash_driver);
1113
1114 MODULE_LICENSE("GPL v2");
1115 MODULE_DESCRIPTION("Imgtec SHA1/224/256 & MD5 hw accelerator driver");
1116 MODULE_AUTHOR("Will Thomas.");
1117 MODULE_AUTHOR("James Hartley <james.hartley@imgtec.com>");