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_BURST              4
  75 #define IMG_HASH_DMA_THRESHOLD          64
  76
  77 #ifdef __LITTLE_ENDIAN
  78 #define IMG_HASH_BYTE_ORDER             CR_CONTROL_BYTE_ORDER_3210
  79 #else
  80 #define IMG_HASH_BYTE_ORDER             CR_CONTROL_BYTE_ORDER_0123
  81 #endif
  82
  83 struct img_hash_dev;
  84
  85 struct img_hash_request_ctx {
  86         struct img_hash_dev     *hdev;
  87         u8 digest[SHA256_DIGEST_SIZE] __aligned(sizeof(u32));
  88         unsigned long           flags;
  89         size_t                  digsize;
  90
  91         dma_addr_t              dma_addr;
  92         size_t                  dma_ct;
  93
  94         /* sg root */
  95         struct scatterlist      *sgfirst;
  96         /* walk state */
  97         struct scatterlist      *sg;
  98         size_t                  nents;
  99         size_t                  offset;
 100         unsigned int            total;
 101         size_t                  sent;
 102
 103         unsigned long           op;
 104
 105         size_t                  bufcnt;
 106         struct ahash_request    fallback_req;
 107
 108         /* Zero length buffer must remain last member of struct */
 109         u8 buffer[0] __aligned(sizeof(u32));
 110 };
 111
 112 struct img_hash_ctx {
 113         struct img_hash_dev     *hdev;
 114         unsigned long           flags;
 115         struct crypto_ahash     *fallback;
 116 };
 117
 118 struct img_hash_dev {
 119         struct list_head        list;
 120         struct device           *dev;
 121         struct clk              *hash_clk;
 122         struct clk              *sys_clk;
 123         void __iomem            *io_base;
 124
 125         phys_addr_t             bus_addr;
 126         void __iomem            *cpu_addr;
 127
 128         spinlock_t              lock;
 129         int                     err;
 130         struct tasklet_struct   done_task;
 131         struct tasklet_struct   dma_task;
 132
 133         unsigned long           flags;
 134         struct crypto_queue     queue;
 135         struct ahash_request    *req;
 136
 137         struct dma_chan         *dma_lch;
 138 };
 139
 140 struct img_hash_drv {
 141         struct list_head dev_list;
 142         spinlock_t lock;
 143 };
 144
 145 static struct img_hash_drv img_hash = {
 146         .dev_list = LIST_HEAD_INIT(img_hash.dev_list),
 147         .lock = __SPIN_LOCK_UNLOCKED(img_hash.lock),
 148 };
 149
 150 static inline u32 img_hash_read(struct img_hash_dev *hdev, u32 offset)
 151 {
 152         return readl_relaxed(hdev->io_base + offset);
 153 }
 154
 155 static inline void img_hash_write(struct img_hash_dev *hdev,
 156                                   u32 offset, u32 value)
 157 {
 158         writel_relaxed(value, hdev->io_base + offset);
 159 }
 160
 161 static inline u32 img_hash_read_result_queue(struct img_hash_dev *hdev)
 162 {
 163         return be32_to_cpu(img_hash_read(hdev, CR_RESULT_QUEUE));
 164 }
 165
 166 static void img_hash_start(struct img_hash_dev *hdev, bool dma)
 167 {
 168         struct img_hash_request_ctx *ctx = ahash_request_ctx(hdev->req);
 169         u32 cr = IMG_HASH_BYTE_ORDER << CR_CONTROL_BYTE_ORDER_SHIFT;
 170
 171         if (ctx->flags & DRIVER_FLAGS_MD5)
 172                 cr |= CR_CONTROL_ALGO_MD5;
 173         else if (ctx->flags & DRIVER_FLAGS_SHA1)
 174                 cr |= CR_CONTROL_ALGO_SHA1;
 175         else if (ctx->flags & DRIVER_FLAGS_SHA224)
 176                 cr |= CR_CONTROL_ALGO_SHA224;
 177         else if (ctx->flags & DRIVER_FLAGS_SHA256)
 178                 cr |= CR_CONTROL_ALGO_SHA256;
 179         dev_dbg(hdev->dev, "Starting hash process\n");
 180         img_hash_write(hdev, CR_CONTROL, cr);
 181
 182         /*
 183          * The hardware block requires two cycles between writing the control
 184          * register and writing the first word of data in non DMA mode, to
 185          * ensure the first data write is not grouped in burst with the control
 186          * register write a read is issued to 'flush' the bus.
 187          */
 188         if (!dma)
 189                 img_hash_read(hdev, CR_CONTROL);
 190 }
 191
 192 static int img_hash_xmit_cpu(struct img_hash_dev *hdev, const u8 *buf,
 193                              size_t length, int final)
 194 {
 195         u32 count, len32;
 196         const u32 *buffer = (const u32 *)buf;
 197
 198         dev_dbg(hdev->dev, "xmit_cpu:  length: %zu bytes\n", length);
 199
 200         if (final)
 201                 hdev->flags |= DRIVER_FLAGS_FINAL;
 202
 203         len32 = DIV_ROUND_UP(length, sizeof(u32));
 204
 205         for (count = 0; count < len32; count++)
 206                 writel_relaxed(buffer[count], hdev->cpu_addr);
 207
 208         return -EINPROGRESS;
 209 }
 210
 211 static void img_hash_dma_callback(void *data)
 212 {
 213         struct img_hash_dev *hdev = (struct img_hash_dev *)data;
 214         struct img_hash_request_ctx *ctx = ahash_request_ctx(hdev->req);
 215
 216         if (ctx->bufcnt) {
 217                 img_hash_xmit_cpu(hdev, ctx->buffer, ctx->bufcnt, 0);
 218                 ctx->bufcnt = 0;
 219         }
 220         if (ctx->sg)
 221                 tasklet_schedule(&hdev->dma_task);
 222 }
 223
 224 static int img_hash_xmit_dma(struct img_hash_dev *hdev, struct scatterlist *sg)
 225 {
 226         struct dma_async_tx_descriptor *desc;
 227         struct img_hash_request_ctx *ctx = ahash_request_ctx(hdev->req);
 228
 229         ctx->dma_ct = dma_map_sg(hdev->dev, sg, 1, DMA_MEM_TO_DEV);
 230         if (ctx->dma_ct == 0) {
 231                 dev_err(hdev->dev, "Invalid DMA sg\n");
 232                 hdev->err = -EINVAL;
 233                 return -EINVAL;
 234         }
 235
 236         desc = dmaengine_prep_slave_sg(hdev->dma_lch,
 237                                        sg,
 238                                        ctx->dma_ct,
 239                                        DMA_MEM_TO_DEV,
 240                                        DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 241         if (!desc) {
 242                 dev_err(hdev->dev, "Null DMA descriptor\n");
 243                 hdev->err = -EINVAL;
 244                 dma_unmap_sg(hdev->dev, sg, 1, DMA_MEM_TO_DEV);
 245                 return -EINVAL;
 246         }
 247         desc->callback = img_hash_dma_callback;
 248         desc->callback_param = hdev;
 249         dmaengine_submit(desc);
 250         dma_async_issue_pending(hdev->dma_lch);
 251
 252         return 0;
 253 }
 254
 255 static int img_hash_write_via_cpu(struct img_hash_dev *hdev)
 256 {
 257         struct img_hash_request_ctx *ctx = ahash_request_ctx(hdev->req);
 258
 259         ctx->bufcnt = sg_copy_to_buffer(hdev->req->src, sg_nents(ctx->sg),
 260                                         ctx->buffer, hdev->req->nbytes);
 261
 262         ctx->total = hdev->req->nbytes;
 263         ctx->bufcnt = 0;
 264
 265         hdev->flags |= (DRIVER_FLAGS_CPU | DRIVER_FLAGS_FINAL);
 266
 267         img_hash_start(hdev, false);
 268
 269         return img_hash_xmit_cpu(hdev, ctx->buffer, ctx->total, 1);
 270 }
 271
 272 static int img_hash_finish(struct ahash_request *req)
 273 {
 274         struct img_hash_request_ctx *ctx = ahash_request_ctx(req);
 275
 276         if (!req->result)
 277                 return -EINVAL;
 278
 279         memcpy(req->result, ctx->digest, ctx->digsize);
 280
 281         return 0;
 282 }
 283
 284 static void img_hash_copy_hash(struct ahash_request *req)
 285 {
 286         struct img_hash_request_ctx *ctx = ahash_request_ctx(req);
 287         u32 *hash = (u32 *)ctx->digest;
 288         int i;
 289
 290         for (i = (ctx->digsize / sizeof(u32)) - 1; i >= 0; i--)
 291                 hash[i] = img_hash_read_result_queue(ctx->hdev);
 292 }
 293
 294 static void img_hash_finish_req(struct ahash_request *req, int err)
 295 {
 296         struct img_hash_request_ctx *ctx = ahash_request_ctx(req);
 297         struct img_hash_dev *hdev =  ctx->hdev;
 298
 299         if (!err) {
 300                 img_hash_copy_hash(req);
 301                 if (DRIVER_FLAGS_FINAL & hdev->flags)
 302                         err = img_hash_finish(req);
 303         } else {
 304                 dev_warn(hdev->dev, "Hash failed with error %d\n", err);
 305                 ctx->flags |= DRIVER_FLAGS_ERROR;
 306         }
 307
 308         hdev->flags &= ~(DRIVER_FLAGS_DMA_READY | DRIVER_FLAGS_OUTPUT_READY |
 309                 DRIVER_FLAGS_CPU | DRIVER_FLAGS_BUSY | DRIVER_FLAGS_FINAL);
 310
 311         if (req->base.complete)
 312                 req->base.complete(&req->base, err);
 313 }
 314
 315 static int img_hash_write_via_dma(struct img_hash_dev *hdev)
 316 {
 317         struct img_hash_request_ctx *ctx = ahash_request_ctx(hdev->req);
 318
 319         img_hash_start(hdev, true);
 320
 321         dev_dbg(hdev->dev, "xmit dma size: %d\n", ctx->total);
 322
 323         if (!ctx->total)
 324                 hdev->flags |= DRIVER_FLAGS_FINAL;
 325
 326         hdev->flags |= DRIVER_FLAGS_DMA_ACTIVE | DRIVER_FLAGS_FINAL;
 327
 328         tasklet_schedule(&hdev->dma_task);
 329
 330         return -EINPROGRESS;
 331 }
 332
 333 static int img_hash_dma_init(struct img_hash_dev *hdev)
 334 {
 335         struct dma_slave_config dma_conf;
 336         int err = -EINVAL;
 337
 338         hdev->dma_lch = dma_request_slave_channel(hdev->dev, "tx");
 339         if (!hdev->dma_lch) {
 340                 dev_err(hdev->dev, "Couldn't acquire a slave DMA channel.\n");
 341                 return -EBUSY;
 342         }
 343         dma_conf.direction = DMA_MEM_TO_DEV;
 344         dma_conf.dst_addr = hdev->bus_addr;
 345         dma_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 346         dma_conf.dst_maxburst = IMG_HASH_DMA_BURST;
 347         dma_conf.device_fc = false;
 348
 349         err = dmaengine_slave_config(hdev->dma_lch,  &dma_conf);
 350         if (err) {
 351                 dev_err(hdev->dev, "Couldn't configure DMA slave.\n");
 352                 dma_release_channel(hdev->dma_lch);
 353                 return err;
 354         }
 355
 356         return 0;
 357 }
 358
 359 static void img_hash_dma_task(unsigned long d)
 360 {
 361         struct img_hash_dev *hdev = (struct img_hash_dev *)d;
 362         struct img_hash_request_ctx *ctx = ahash_request_ctx(hdev->req);
 363         u8 *addr;
 364         size_t nbytes, bleft, wsend, len, tbc;
 365         struct scatterlist tsg;
 366
 367         if (!hdev->req || !ctx->sg)
 368                 return;
 369
 370         addr = sg_virt(ctx->sg);
 371         nbytes = ctx->sg->length - ctx->offset;
 372
 373         /*
 374          * The hash accelerator does not support a data valid mask. This means
 375          * that if each dma (i.e. per page) is not a multiple of 4 bytes, the
 376          * padding bytes in the last word written by that dma would erroneously
 377          * be included in the hash. To avoid this we round down the transfer,
 378          * and add the excess to the start of the next dma. It does not matter
 379          * that the final dma may not be a multiple of 4 bytes as the hashing
 380          * block is programmed to accept the correct number of bytes.
 381          */
 382
 383         bleft = nbytes % 4;
 384         wsend = (nbytes / 4);
 385
 386         if (wsend) {
 387                 sg_init_one(&tsg, addr + ctx->offset, wsend * 4);
 388                 if (img_hash_xmit_dma(hdev, &tsg)) {
 389                         dev_err(hdev->dev, "DMA failed, falling back to CPU");
 390                         ctx->flags |= DRIVER_FLAGS_CPU;
 391                         hdev->err = 0;
 392                         img_hash_xmit_cpu(hdev, addr + ctx->offset,
 393                                           wsend * 4, 0);
 394                         ctx->sent += wsend * 4;
 395                         wsend = 0;
 396                 } else {
 397                         ctx->sent += wsend * 4;
 398                 }
 399         }
 400
 401         if (bleft) {
 402                 ctx->bufcnt = sg_pcopy_to_buffer(ctx->sgfirst, ctx->nents,
 403                                                  ctx->buffer, bleft, ctx->sent);
 404                 tbc = 0;
 405                 ctx->sg = sg_next(ctx->sg);
 406                 while (ctx->sg && (ctx->bufcnt < 4)) {
 407                         len = ctx->sg->length;
 408                         if (likely(len > (4 - ctx->bufcnt)))
 409                                 len = 4 - ctx->bufcnt;
 410                         tbc = sg_pcopy_to_buffer(ctx->sgfirst, ctx->nents,
 411                                                  ctx->buffer + ctx->bufcnt, len,
 412                                         ctx->sent + ctx->bufcnt);
 413                         ctx->bufcnt += tbc;
 414                         if (tbc >= ctx->sg->length) {
 415                                 ctx->sg = sg_next(ctx->sg);
 416                                 tbc = 0;
 417                         }
 418                 }
 419
 420                 ctx->sent += ctx->bufcnt;
 421                 ctx->offset = tbc;
 422
 423                 if (!wsend)
 424                         img_hash_dma_callback(hdev);
 425         } else {
 426                 ctx->offset = 0;
 427                 ctx->sg = sg_next(ctx->sg);
 428         }
 429 }
 430
 431 static int img_hash_write_via_dma_stop(struct img_hash_dev *hdev)
 432 {
 433         struct img_hash_request_ctx *ctx = ahash_request_ctx(hdev->req);
 434
 435         if (ctx->flags & DRIVER_FLAGS_SG)
 436                 dma_unmap_sg(hdev->dev, ctx->sg, ctx->dma_ct, DMA_TO_DEVICE);
 437
 438         return 0;
 439 }
 440
 441 static int img_hash_process_data(struct img_hash_dev *hdev)
 442 {
 443         struct ahash_request *req = hdev->req;
 444         struct img_hash_request_ctx *ctx = ahash_request_ctx(req);
 445         int err = 0;
 446
 447         ctx->bufcnt = 0;
 448
 449         if (req->nbytes >= IMG_HASH_DMA_THRESHOLD) {
 450                 dev_dbg(hdev->dev, "process data request(%d bytes) using DMA\n",
 451                         req->nbytes);
 452                 err = img_hash_write_via_dma(hdev);
 453         } else {
 454                 dev_dbg(hdev->dev, "process data request(%d bytes) using CPU\n",
 455                         req->nbytes);
 456                 err = img_hash_write_via_cpu(hdev);
 457         }
 458         return err;
 459 }
 460
 461 static int img_hash_hw_init(struct img_hash_dev *hdev)
 462 {
 463         unsigned long long nbits;
 464         u32 u, l;
 465
 466         img_hash_write(hdev, CR_RESET, CR_RESET_SET);
 467         img_hash_write(hdev, CR_RESET, CR_RESET_UNSET);
 468         img_hash_write(hdev, CR_INTENAB, CR_INT_NEW_RESULTS_SET);
 469
 470         nbits = (u64)hdev->req->nbytes << 3;
 471         u = nbits >> 32;
 472         l = nbits;
 473         img_hash_write(hdev, CR_MESSAGE_LENGTH_H, u);
 474         img_hash_write(hdev, CR_MESSAGE_LENGTH_L, l);
 475
 476         if (!(DRIVER_FLAGS_INIT & hdev->flags)) {
 477                 hdev->flags |= DRIVER_FLAGS_INIT;
 478                 hdev->err = 0;
 479         }
 480         dev_dbg(hdev->dev, "hw initialized, nbits: %llx\n", nbits);
 481         return 0;
 482 }
 483
 484 static int img_hash_init(struct ahash_request *req)
 485 {
 486         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 487         struct img_hash_request_ctx *rctx = ahash_request_ctx(req);
 488         struct img_hash_ctx *ctx = crypto_ahash_ctx(tfm);
 489
 490         ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback);
 491         rctx->fallback_req.base.flags = req->base.flags
 492                 & CRYPTO_TFM_REQ_MAY_SLEEP;
 493
 494         return crypto_ahash_init(&rctx->fallback_req);
 495 }
 496
 497 static int img_hash_handle_queue(struct img_hash_dev *hdev,
 498                                  struct ahash_request *req)
 499 {
 500         struct crypto_async_request *async_req, *backlog;
 501         struct img_hash_request_ctx *ctx;
 502         unsigned long flags;
 503         int err = 0, res = 0;
 504
 505         spin_lock_irqsave(&hdev->lock, flags);
 506
 507         if (req)
 508                 res = ahash_enqueue_request(&hdev->queue, req);
 509
 510         if (DRIVER_FLAGS_BUSY & hdev->flags) {
 511                 spin_unlock_irqrestore(&hdev->lock, flags);
 512                 return res;
 513         }
 514
 515         backlog = crypto_get_backlog(&hdev->queue);
 516         async_req = crypto_dequeue_request(&hdev->queue);
 517         if (async_req)
 518                 hdev->flags |= DRIVER_FLAGS_BUSY;
 519
 520         spin_unlock_irqrestore(&hdev->lock, flags);
 521
 522         if (!async_req)
 523                 return res;
 524
 525         if (backlog)
 526                 backlog->complete(backlog, -EINPROGRESS);
 527
 528         req = ahash_request_cast(async_req);
 529         hdev->req = req;
 530
 531         ctx = ahash_request_ctx(req);
 532
 533         dev_info(hdev->dev, "processing req, op: %lu, bytes: %d\n",
 534                  ctx->op, req->nbytes);
 535
 536         err = img_hash_hw_init(hdev);
 537
 538         if (!err)
 539                 err = img_hash_process_data(hdev);
 540
 541         if (err != -EINPROGRESS) {
 542                 /* done_task will not finish so do it here */
 543                 img_hash_finish_req(req, err);
 544         }
 545         return res;
 546 }
 547
 548 static int img_hash_update(struct ahash_request *req)
 549 {
 550         struct img_hash_request_ctx *rctx = ahash_request_ctx(req);
 551         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 552         struct img_hash_ctx *ctx = crypto_ahash_ctx(tfm);
 553
 554         ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback);
 555         rctx->fallback_req.base.flags = req->base.flags
 556                 & CRYPTO_TFM_REQ_MAY_SLEEP;
 557         rctx->fallback_req.nbytes = req->nbytes;
 558         rctx->fallback_req.src = req->src;
 559
 560         return crypto_ahash_update(&rctx->fallback_req);
 561 }
 562
 563 static int img_hash_final(struct ahash_request *req)
 564 {
 565         struct img_hash_request_ctx *rctx = ahash_request_ctx(req);
 566         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 567         struct img_hash_ctx *ctx = crypto_ahash_ctx(tfm);
 568
 569         ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback);
 570         rctx->fallback_req.base.flags = req->base.flags
 571                 & CRYPTO_TFM_REQ_MAY_SLEEP;
 572         rctx->fallback_req.result = req->result;
 573
 574         return crypto_ahash_final(&rctx->fallback_req);
 575 }
 576
 577 static int img_hash_finup(struct ahash_request *req)
 578 {
 579         struct img_hash_request_ctx *rctx = ahash_request_ctx(req);
 580         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 581         struct img_hash_ctx *ctx = crypto_ahash_ctx(tfm);
 582
 583         ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback);
 584         rctx->fallback_req.base.flags = req->base.flags
 585                 & CRYPTO_TFM_REQ_MAY_SLEEP;
 586         rctx->fallback_req.nbytes = req->nbytes;
 587         rctx->fallback_req.src = req->src;
 588         rctx->fallback_req.result = req->result;
 589
 590         return crypto_ahash_finup(&rctx->fallback_req);
 591 }
 592
 593 static int img_hash_digest(struct ahash_request *req)
 594 {
 595         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 596         struct img_hash_ctx *tctx = crypto_ahash_ctx(tfm);
 597         struct img_hash_request_ctx *ctx = ahash_request_ctx(req);
 598         struct img_hash_dev *hdev = NULL;
 599         struct img_hash_dev *tmp;
 600         int err;
 601
 602         spin_lock(&img_hash.lock);
 603         if (!tctx->hdev) {
 604                 list_for_each_entry(tmp, &img_hash.dev_list, list) {
 605                         hdev = tmp;
 606                         break;
 607                 }
 608                 tctx->hdev = hdev;
 609
 610         } else {
 611                 hdev = tctx->hdev;
 612         }
 613
 614         spin_unlock(&img_hash.lock);
 615         ctx->hdev = hdev;
 616         ctx->flags = 0;
 617         ctx->digsize = crypto_ahash_digestsize(tfm);
 618
 619         switch (ctx->digsize) {
 620         case SHA1_DIGEST_SIZE:
 621                 ctx->flags |= DRIVER_FLAGS_SHA1;
 622                 break;
 623         case SHA256_DIGEST_SIZE:
 624                 ctx->flags |= DRIVER_FLAGS_SHA256;
 625                 break;
 626         case SHA224_DIGEST_SIZE:
 627                 ctx->flags |= DRIVER_FLAGS_SHA224;
 628                 break;
 629         case MD5_DIGEST_SIZE:
 630                 ctx->flags |= DRIVER_FLAGS_MD5;
 631                 break;
 632         default:
 633                 return -EINVAL;
 634         }
 635
 636         ctx->bufcnt = 0;
 637         ctx->offset = 0;
 638         ctx->sent = 0;
 639         ctx->total = req->nbytes;
 640         ctx->sg = req->src;
 641         ctx->sgfirst = req->src;
 642         ctx->nents = sg_nents(ctx->sg);
 643
 644         err = img_hash_handle_queue(tctx->hdev, req);
 645
 646         return err;
 647 }
 648
 649 static int img_hash_cra_init(struct crypto_tfm *tfm)
 650 {
 651         struct img_hash_ctx *ctx = crypto_tfm_ctx(tfm);
 652         const char *alg_name = crypto_tfm_alg_name(tfm);
 653         int err = -ENOMEM;
 654
 655         ctx->fallback = crypto_alloc_ahash(alg_name, 0,
 656                                            CRYPTO_ALG_NEED_FALLBACK);
 657         if (IS_ERR(ctx->fallback)) {
 658                 pr_err("img_hash: Could not load fallback driver.\n");
 659                 err = PTR_ERR(ctx->fallback);
 660                 goto err;
 661         }
 662         crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
 663                                  sizeof(struct img_hash_request_ctx) +
 664                                  IMG_HASH_DMA_THRESHOLD);
 665
 666         return 0;
 667
 668 err:
 669         return err;
 670 }
 671
 672 static void img_hash_cra_exit(struct crypto_tfm *tfm)
 673 {
 674         struct img_hash_ctx *tctx = crypto_tfm_ctx(tfm);
 675
 676         crypto_free_ahash(tctx->fallback);
 677 }
 678
 679 static irqreturn_t img_irq_handler(int irq, void *dev_id)
 680 {
 681         struct img_hash_dev *hdev = dev_id;
 682         u32 reg;
 683
 684         reg = img_hash_read(hdev, CR_INTSTAT);
 685         img_hash_write(hdev, CR_INTCLEAR, reg);
 686
 687         if (reg & CR_INT_NEW_RESULTS_SET) {
 688                 dev_dbg(hdev->dev, "IRQ CR_INT_NEW_RESULTS_SET\n");
 689                 if (DRIVER_FLAGS_BUSY & hdev->flags) {
 690                         hdev->flags |= DRIVER_FLAGS_OUTPUT_READY;
 691                         if (!(DRIVER_FLAGS_CPU & hdev->flags))
 692                                 hdev->flags |= DRIVER_FLAGS_DMA_READY;
 693                         tasklet_schedule(&hdev->done_task);
 694                 } else {
 695                         dev_warn(hdev->dev,
 696                                  "HASH interrupt when no active requests.\n");
 697                 }
 698         } else if (reg & CR_INT_RESULTS_AVAILABLE) {
 699                 dev_warn(hdev->dev,
 700                          "IRQ triggered before the hash had completed\n");
 701         } else if (reg & CR_INT_RESULT_READ_ERR) {
 702                 dev_warn(hdev->dev,
 703                          "Attempt to read from an empty result queue\n");
 704         } else if (reg & CR_INT_MESSAGE_WRITE_ERROR) {
 705                 dev_warn(hdev->dev,
 706                          "Data written before the hardware was configured\n");
 707         }
 708         return IRQ_HANDLED;
 709 }
 710
 711 static struct ahash_alg img_algs[] = {
 712         {
 713                 .init = img_hash_init,
 714                 .update = img_hash_update,
 715                 .final = img_hash_final,
 716                 .finup = img_hash_finup,
 717                 .digest = img_hash_digest,
 718                 .halg = {
 719                         .digestsize = MD5_DIGEST_SIZE,
 720                         .base = {
 721                                 .cra_name = "md5",
 722                                 .cra_driver_name = "img-md5",
 723                                 .cra_priority = 300,
 724                                 .cra_flags =
 725                                 CRYPTO_ALG_ASYNC |
 726                                 CRYPTO_ALG_NEED_FALLBACK,
 727                                 .cra_blocksize = MD5_HMAC_BLOCK_SIZE,
 728                                 .cra_ctxsize = sizeof(struct img_hash_ctx),
 729                                 .cra_init = img_hash_cra_init,
 730                                 .cra_exit = img_hash_cra_exit,
 731                                 .cra_module = THIS_MODULE,
 732                         }
 733                 }
 734         },
 735         {
 736                 .init = img_hash_init,
 737                 .update = img_hash_update,
 738                 .final = img_hash_final,
 739                 .finup = img_hash_finup,
 740                 .digest = img_hash_digest,
 741                 .halg = {
 742                         .digestsize = SHA1_DIGEST_SIZE,
 743                         .base = {
 744                                 .cra_name = "sha1",
 745                                 .cra_driver_name = "img-sha1",
 746                                 .cra_priority = 300,
 747                                 .cra_flags =
 748                                 CRYPTO_ALG_ASYNC |
 749                                 CRYPTO_ALG_NEED_FALLBACK,
 750                                 .cra_blocksize = SHA1_BLOCK_SIZE,
 751                                 .cra_ctxsize = sizeof(struct img_hash_ctx),
 752                                 .cra_init = img_hash_cra_init,
 753                                 .cra_exit = img_hash_cra_exit,
 754                                 .cra_module = THIS_MODULE,
 755                         }
 756                 }
 757         },
 758         {
 759                 .init = img_hash_init,
 760                 .update = img_hash_update,
 761                 .final = img_hash_final,
 762                 .finup = img_hash_finup,
 763                 .digest = img_hash_digest,
 764                 .halg = {
 765                         .digestsize = SHA224_DIGEST_SIZE,
 766                         .base = {
 767                                 .cra_name = "sha224",
 768                                 .cra_driver_name = "img-sha224",
 769                                 .cra_priority = 300,
 770                                 .cra_flags =
 771                                 CRYPTO_ALG_ASYNC |
 772                                 CRYPTO_ALG_NEED_FALLBACK,
 773                                 .cra_blocksize = SHA224_BLOCK_SIZE,
 774                                 .cra_ctxsize = sizeof(struct img_hash_ctx),
 775                                 .cra_init = img_hash_cra_init,
 776                                 .cra_exit = img_hash_cra_exit,
 777                                 .cra_module = THIS_MODULE,
 778                         }
 779                 }
 780         },
 781         {
 782                 .init = img_hash_init,
 783                 .update = img_hash_update,
 784                 .final = img_hash_final,
 785                 .finup = img_hash_finup,
 786                 .digest = img_hash_digest,
 787                 .halg = {
 788                         .digestsize = SHA256_DIGEST_SIZE,
 789                         .base = {
 790                                 .cra_name = "sha256",
 791                                 .cra_driver_name = "img-sha256",
 792                                 .cra_priority = 300,
 793                                 .cra_flags =
 794                                 CRYPTO_ALG_ASYNC |
 795                                 CRYPTO_ALG_NEED_FALLBACK,
 796                                 .cra_blocksize = SHA256_BLOCK_SIZE,
 797                                 .cra_ctxsize = sizeof(struct img_hash_ctx),
 798                                 .cra_init = img_hash_cra_init,
 799                                 .cra_exit = img_hash_cra_exit,
 800                                 .cra_module = THIS_MODULE,
 801                         }
 802                 }
 803         }
 804 };
 805
 806 static int img_register_algs(struct img_hash_dev *hdev)
 807 {
 808         int i, err;
 809
 810         for (i = 0; i < ARRAY_SIZE(img_algs); i++) {
 811                 err = crypto_register_ahash(&img_algs[i]);
 812                 if (err)
 813                         goto err_reg;
 814         }
 815         return 0;
 816
 817 err_reg:
 818         for (; i--; )
 819                 crypto_unregister_ahash(&img_algs[i]);
 820
 821         return err;
 822 }
 823
 824 static int img_unregister_algs(struct img_hash_dev *hdev)
 825 {
 826         int i;
 827
 828         for (i = 0; i < ARRAY_SIZE(img_algs); i++)
 829                 crypto_unregister_ahash(&img_algs[i]);
 830         return 0;
 831 }
 832
 833 static void img_hash_done_task(unsigned long data)
 834 {
 835         struct img_hash_dev *hdev = (struct img_hash_dev *)data;
 836         int err = 0;
 837
 838         if (hdev->err == -EINVAL) {
 839                 err = hdev->err;
 840                 goto finish;
 841         }
 842
 843         if (!(DRIVER_FLAGS_BUSY & hdev->flags)) {
 844                 img_hash_handle_queue(hdev, NULL);
 845                 return;
 846         }
 847
 848         if (DRIVER_FLAGS_CPU & hdev->flags) {
 849                 if (DRIVER_FLAGS_OUTPUT_READY & hdev->flags) {
 850                         hdev->flags &= ~DRIVER_FLAGS_OUTPUT_READY;
 851                         goto finish;
 852                 }
 853         } else if (DRIVER_FLAGS_DMA_READY & hdev->flags) {
 854                 if (DRIVER_FLAGS_DMA_ACTIVE & hdev->flags) {
 855                         hdev->flags &= ~DRIVER_FLAGS_DMA_ACTIVE;
 856                         img_hash_write_via_dma_stop(hdev);
 857                         if (hdev->err) {
 858                                 err = hdev->err;
 859                                 goto finish;
 860                         }
 861                 }
 862                 if (DRIVER_FLAGS_OUTPUT_READY & hdev->flags) {
 863                         hdev->flags &= ~(DRIVER_FLAGS_DMA_READY |
 864                                         DRIVER_FLAGS_OUTPUT_READY);
 865                         goto finish;
 866                 }
 867         }
 868         return;
 869
 870 finish:
 871         img_hash_finish_req(hdev->req, err);
 872 }
 873
 874 static const struct of_device_id img_hash_match[] = {
 875         { .compatible = "img,hash-accelerator" },
 876         {}
 877 };
 878 MODULE_DEVICE_TABLE(of, img_hash_match);
 879
 880 static int img_hash_probe(struct platform_device *pdev)
 881 {
 882         struct img_hash_dev *hdev;
 883         struct device *dev = &pdev->dev;
 884         struct resource *hash_res;
 885         int     irq;
 886         int err;
 887
 888         hdev = devm_kzalloc(dev, sizeof(*hdev), GFP_KERNEL);
 889         if (hdev == NULL)
 890                 return -ENOMEM;
 891
 892         spin_lock_init(&hdev->lock);
 893
 894         hdev->dev = dev;
 895
 896         platform_set_drvdata(pdev, hdev);
 897
 898         INIT_LIST_HEAD(&hdev->list);
 899
 900         tasklet_init(&hdev->done_task, img_hash_done_task, (unsigned long)hdev);
 901         tasklet_init(&hdev->dma_task, img_hash_dma_task, (unsigned long)hdev);
 902
 903         crypto_init_queue(&hdev->queue, IMG_HASH_QUEUE_LENGTH);
 904
 905         /* Register bank */
 906         hash_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 907
 908         hdev->io_base = devm_ioremap_resource(dev, hash_res);
 909         if (IS_ERR(hdev->io_base)) {
 910                 err = PTR_ERR(hdev->io_base);
 911                 dev_err(dev, "can't ioremap, returned %d\n", err);
 912
 913                 goto res_err;
 914         }
 915
 916         /* Write port (DMA or CPU) */
 917         hash_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 918         hdev->cpu_addr = devm_ioremap_resource(dev, hash_res);
 919         if (IS_ERR(hdev->cpu_addr)) {
 920                 dev_err(dev, "can't ioremap write port\n");
 921                 err = PTR_ERR(hdev->cpu_addr);
 922                 goto res_err;
 923         }
 924         hdev->bus_addr = hash_res->start;
 925
 926         irq = platform_get_irq(pdev, 0);
 927         if (irq < 0) {
 928                 dev_err(dev, "no IRQ resource info\n");
 929                 err = irq;
 930                 goto res_err;
 931         }
 932
 933         err = devm_request_irq(dev, irq, img_irq_handler, 0,
 934                                dev_name(dev), hdev);
 935         if (err) {
 936                 dev_err(dev, "unable to request irq\n");
 937                 goto res_err;
 938         }
 939         dev_dbg(dev, "using IRQ channel %d\n", irq);
 940
 941         hdev->hash_clk = devm_clk_get(&pdev->dev, "hash");
 942         if (IS_ERR(hdev->hash_clk)) {
 943                 dev_err(dev, "clock initialization failed.\n");
 944                 err = PTR_ERR(hdev->hash_clk);
 945                 goto res_err;
 946         }
 947
 948         hdev->sys_clk = devm_clk_get(&pdev->dev, "sys");
 949         if (IS_ERR(hdev->sys_clk)) {
 950                 dev_err(dev, "clock initialization failed.\n");
 951                 err = PTR_ERR(hdev->sys_clk);
 952                 goto res_err;
 953         }
 954
 955         err = clk_prepare_enable(hdev->hash_clk);
 956         if (err)
 957                 goto res_err;
 958
 959         err = clk_prepare_enable(hdev->sys_clk);
 960         if (err)
 961                 goto clk_err;
 962
 963         err = img_hash_dma_init(hdev);
 964         if (err)
 965                 goto dma_err;
 966
 967         dev_dbg(dev, "using %s for DMA transfers\n",
 968                 dma_chan_name(hdev->dma_lch));
 969
 970         spin_lock(&img_hash.lock);
 971         list_add_tail(&hdev->list, &img_hash.dev_list);
 972         spin_unlock(&img_hash.lock);
 973
 974         err = img_register_algs(hdev);
 975         if (err)
 976                 goto err_algs;
 977         dev_dbg(dev, "Img MD5/SHA1/SHA224/SHA256 Hardware accelerator initialized\n");
 978
 979         return 0;
 980
 981 err_algs:
 982         spin_lock(&img_hash.lock);
 983         list_del(&hdev->list);
 984         spin_unlock(&img_hash.lock);
 985         dma_release_channel(hdev->dma_lch);
 986 dma_err:
 987         clk_disable_unprepare(hdev->sys_clk);
 988 clk_err:
 989         clk_disable_unprepare(hdev->hash_clk);
 990 res_err:
 991         tasklet_kill(&hdev->done_task);
 992         tasklet_kill(&hdev->dma_task);
 993
 994         return err;
 995 }
 996
 997 static int img_hash_remove(struct platform_device *pdev)
 998 {
 999         static struct img_hash_dev *hdev;
1000
1001         hdev = platform_get_drvdata(pdev);
1002         spin_lock(&img_hash.lock);
1003         list_del(&hdev->list);
1004         spin_unlock(&img_hash.lock);
1005
1006         img_unregister_algs(hdev);
1007
1008         tasklet_kill(&hdev->done_task);
1009         tasklet_kill(&hdev->dma_task);
1010
1011         dma_release_channel(hdev->dma_lch);
1012
1013         clk_disable_unprepare(hdev->hash_clk);
1014         clk_disable_unprepare(hdev->sys_clk);
1015
1016         return 0;
1017 }
1018
1019 #ifdef CONFIG_PM_SLEEP
1020 static int img_hash_suspend(struct device *dev)
1021 {
1022         struct img_hash_dev *hdev = dev_get_drvdata(dev);
1023
1024         clk_disable_unprepare(hdev->hash_clk);
1025         clk_disable_unprepare(hdev->sys_clk);
1026
1027         return 0;
1028 }
1029
1030 static int img_hash_resume(struct device *dev)
1031 {
1032         struct img_hash_dev *hdev = dev_get_drvdata(dev);
1033
1034         clk_prepare_enable(hdev->hash_clk);
1035         clk_prepare_enable(hdev->sys_clk);
1036
1037         return 0;
1038 }
1039 #endif /* CONFIG_PM_SLEEP */
1040
1041 static const struct dev_pm_ops img_hash_pm_ops = {
1042         SET_SYSTEM_SLEEP_PM_OPS(img_hash_suspend, img_hash_resume)
1043 };
1044
1045 static struct platform_driver img_hash_driver = {
1046         .probe          = img_hash_probe,
1047         .remove         = img_hash_remove,
1048         .driver         = {
1049                 .name   = "img-hash-accelerator",
1050                 .pm     = &img_hash_pm_ops,
1051                 .of_match_table = of_match_ptr(img_hash_match),
1052         }
1053 };
1054 module_platform_driver(img_hash_driver);
1055
1056 MODULE_LICENSE("GPL v2");
1057 MODULE_DESCRIPTION("Imgtec SHA1/224/256 & MD5 hw accelerator driver");
1058 MODULE_AUTHOR("Will Thomas.");
1059 MODULE_AUTHOR("James Hartley <james.hartley@imgtec.com>");