drivers/crypto/atmel-aes.c

   1 /*
   2  * Cryptographic API.
   3  *
   4  * Support for ATMEL AES HW acceleration.
   5  *
   6  * Copyright (c) 2012 Eukréa Electromatique - ATMEL
   7  * Author: Nicolas Royer <[email protected]>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as published
  11  * by the Free Software Foundation.
  12  *
  13  * Some ideas are from omap-aes.c driver.
  14  */
  15
  16
  17 #include <linux/kernel.h>
  18 #include <linux/module.h>
  19 #include <linux/slab.h>
  20 #include <linux/err.h>
  21 #include <linux/clk.h>
  22 #include <linux/io.h>
  23 #include <linux/hw_random.h>
  24 #include <linux/platform_device.h>
  25
  26 #include <linux/device.h>
  27 #include <linux/init.h>
  28 #include <linux/errno.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/irq.h>
  31 #include <linux/scatterlist.h>
  32 #include <linux/dma-mapping.h>
  33 #include <linux/of_device.h>
  34 #include <linux/delay.h>
  35 #include <linux/crypto.h>
  36 #include <linux/cryptohash.h>
  37 #include <crypto/scatterwalk.h>
  38 #include <crypto/algapi.h>
  39 #include <crypto/aes.h>
  40 #include <crypto/hash.h>
  41 #include <crypto/internal/hash.h>
  42 #include <linux/platform_data/crypto-atmel.h>
  43 #include <dt-bindings/dma/at91.h>
  44 #include "atmel-aes-regs.h"
  45
  46 #define CFB8_BLOCK_SIZE         1
  47 #define CFB16_BLOCK_SIZE        2
  48 #define CFB32_BLOCK_SIZE        4
  49 #define CFB64_BLOCK_SIZE        8
  50
  51 /* AES flags */
  52 #define AES_FLAGS_MODE_MASK     0x03ff
  53 #define AES_FLAGS_ENCRYPT       BIT(0)
  54 #define AES_FLAGS_CBC           BIT(1)
  55 #define AES_FLAGS_CFB           BIT(2)
  56 #define AES_FLAGS_CFB8          BIT(3)
  57 #define AES_FLAGS_CFB16         BIT(4)
  58 #define AES_FLAGS_CFB32         BIT(5)
  59 #define AES_FLAGS_CFB64         BIT(6)
  60 #define AES_FLAGS_CFB128        BIT(7)
  61 #define AES_FLAGS_OFB           BIT(8)
  62 #define AES_FLAGS_CTR           BIT(9)
  63
  64 #define AES_FLAGS_INIT          BIT(16)
  65 #define AES_FLAGS_DMA           BIT(17)
  66 #define AES_FLAGS_BUSY          BIT(18)
  67 #define AES_FLAGS_FAST          BIT(19)
  68
  69 #define ATMEL_AES_QUEUE_LENGTH  50
  70
  71 #define ATMEL_AES_DMA_THRESHOLD         16
  72
  73
  74 struct atmel_aes_caps {
  75         bool    has_dualbuff;
  76         bool    has_cfb64;
  77         u32             max_burst_size;
  78 };
  79
  80 struct atmel_aes_dev;
  81
  82 struct atmel_aes_ctx {
  83         struct atmel_aes_dev *dd;
  84
  85         int             keylen;
  86         u32             key[AES_KEYSIZE_256 / sizeof(u32)];
  87
  88         u16             block_size;
  89 };
  90
  91 struct atmel_aes_reqctx {
  92         unsigned long mode;
  93 };
  94
  95 struct atmel_aes_dma {
  96         struct dma_chan                 *chan;
  97         struct dma_slave_config dma_conf;
  98 };
  99
 100 struct atmel_aes_dev {
 101         struct list_head        list;
 102         unsigned long           phys_base;
 103         void __iomem            *io_base;
 104
 105         struct atmel_aes_ctx    *ctx;
 106         struct device           *dev;
 107         struct clk              *iclk;
 108         int     irq;
 109
 110         unsigned long           flags;
 111         int     err;
 112
 113         spinlock_t              lock;
 114         struct crypto_queue     queue;
 115
 116         struct tasklet_struct   done_task;
 117         struct tasklet_struct   queue_task;
 118
 119         struct ablkcipher_request       *req;
 120         size_t  total;
 121
 122         struct scatterlist      *in_sg;
 123         unsigned int            nb_in_sg;
 124         size_t                          in_offset;
 125         struct scatterlist      *out_sg;
 126         unsigned int            nb_out_sg;
 127         size_t                          out_offset;
 128
 129         size_t  bufcnt;
 130         size_t  buflen;
 131         size_t  dma_size;
 132
 133         void    *buf_in;
 134         int             dma_in;
 135         dma_addr_t      dma_addr_in;
 136         struct atmel_aes_dma    dma_lch_in;
 137
 138         void    *buf_out;
 139         int             dma_out;
 140         dma_addr_t      dma_addr_out;
 141         struct atmel_aes_dma    dma_lch_out;
 142
 143         struct atmel_aes_caps   caps;
 144
 145         u32     hw_version;
 146 };
 147
 148 struct atmel_aes_drv {
 149         struct list_head        dev_list;
 150         spinlock_t              lock;
 151 };
 152
 153 static struct atmel_aes_drv atmel_aes = {
 154         .dev_list = LIST_HEAD_INIT(atmel_aes.dev_list),
 155         .lock = __SPIN_LOCK_UNLOCKED(atmel_aes.lock),
 156 };
 157
 158 static int atmel_aes_sg_length(struct ablkcipher_request *req,
 159                         struct scatterlist *sg)
 160 {
 161         unsigned int total = req->nbytes;
 162         int sg_nb;
 163         unsigned int len;
 164         struct scatterlist *sg_list;
 165
 166         sg_nb = 0;
 167         sg_list = sg;
 168         total = req->nbytes;
 169
 170         while (total) {
 171                 len = min(sg_list->length, total);
 172
 173                 sg_nb++;
 174                 total -= len;
 175
 176                 sg_list = sg_next(sg_list);
 177                 if (!sg_list)
 178                         total = 0;
 179         }
 180
 181         return sg_nb;
 182 }
 183
 184 static int atmel_aes_sg_copy(struct scatterlist **sg, size_t *offset,
 185                         void *buf, size_t buflen, size_t total, int out)
 186 {
 187         unsigned int count, off = 0;
 188
 189         while (buflen && total) {
 190                 count = min((*sg)->length - *offset, total);
 191                 count = min(count, buflen);
 192
 193                 if (!count)
 194                         return off;
 195
 196                 scatterwalk_map_and_copy(buf + off, *sg, *offset, count, out);
 197
 198                 off += count;
 199                 buflen -= count;
 200                 *offset += count;
 201                 total -= count;
 202
 203                 if (*offset == (*sg)->length) {
 204                         *sg = sg_next(*sg);
 205                         if (*sg)
 206                                 *offset = 0;
 207                         else
 208                                 total = 0;
 209                 }
 210         }
 211
 212         return off;
 213 }
 214
 215 static inline u32 atmel_aes_read(struct atmel_aes_dev *dd, u32 offset)
 216 {
 217         return readl_relaxed(dd->io_base + offset);
 218 }
 219
 220 static inline void atmel_aes_write(struct atmel_aes_dev *dd,
 221                                         u32 offset, u32 value)
 222 {
 223         writel_relaxed(value, dd->io_base + offset);
 224 }
 225
 226 static void atmel_aes_read_n(struct atmel_aes_dev *dd, u32 offset,
 227                                         u32 *value, int count)
 228 {
 229         for (; count--; value++, offset += 4)
 230                 *value = atmel_aes_read(dd, offset);
 231 }
 232
 233 static void atmel_aes_write_n(struct atmel_aes_dev *dd, u32 offset,
 234                                         u32 *value, int count)
 235 {
 236         for (; count--; value++, offset += 4)
 237                 atmel_aes_write(dd, offset, *value);
 238 }
 239
 240 static struct atmel_aes_dev *atmel_aes_find_dev(struct atmel_aes_ctx *ctx)
 241 {
 242         struct atmel_aes_dev *aes_dd = NULL;
 243         struct atmel_aes_dev *tmp;
 244
 245         spin_lock_bh(&atmel_aes.lock);
 246         if (!ctx->dd) {
 247                 list_for_each_entry(tmp, &atmel_aes.dev_list, list) {
 248                         aes_dd = tmp;
 249                         break;
 250                 }
 251                 ctx->dd = aes_dd;
 252         } else {
 253                 aes_dd = ctx->dd;
 254         }
 255
 256         spin_unlock_bh(&atmel_aes.lock);
 257
 258         return aes_dd;
 259 }
 260
 261 static int atmel_aes_hw_init(struct atmel_aes_dev *dd)
 262 {
 263         clk_prepare_enable(dd->iclk);
 264
 265         if (!(dd->flags & AES_FLAGS_INIT)) {
 266                 atmel_aes_write(dd, AES_CR, AES_CR_SWRST);
 267                 atmel_aes_write(dd, AES_MR, 0xE << AES_MR_CKEY_OFFSET);
 268                 dd->flags |= AES_FLAGS_INIT;
 269                 dd->err = 0;
 270         }
 271
 272         return 0;
 273 }
 274
 275 static inline unsigned int atmel_aes_get_version(struct atmel_aes_dev *dd)
 276 {
 277         return atmel_aes_read(dd, AES_HW_VERSION) & 0x00000fff;
 278 }
 279
 280 static void atmel_aes_hw_version_init(struct atmel_aes_dev *dd)
 281 {
 282         atmel_aes_hw_init(dd);
 283
 284         dd->hw_version = atmel_aes_get_version(dd);
 285
 286         dev_info(dd->dev,
 287                         "version: 0x%x\n", dd->hw_version);
 288
 289         clk_disable_unprepare(dd->iclk);
 290 }
 291
 292 static void atmel_aes_finish_req(struct atmel_aes_dev *dd, int err)
 293 {
 294         struct ablkcipher_request *req = dd->req;
 295
 296         clk_disable_unprepare(dd->iclk);
 297         dd->flags &= ~AES_FLAGS_BUSY;
 298
 299         req->base.complete(&req->base, err);
 300 }
 301
 302 static void atmel_aes_dma_callback(void *data)
 303 {
 304         struct atmel_aes_dev *dd = data;
 305
 306         /* dma_lch_out - completed */
 307         tasklet_schedule(&dd->done_task);
 308 }
 309
 310 static int atmel_aes_crypt_dma(struct atmel_aes_dev *dd,
 311                 dma_addr_t dma_addr_in, dma_addr_t dma_addr_out, int length)
 312 {
 313         struct scatterlist sg[2];
 314         struct dma_async_tx_descriptor  *in_desc, *out_desc;
 315
 316         dd->dma_size = length;
 317
 318         if (!(dd->flags & AES_FLAGS_FAST)) {
 319                 dma_sync_single_for_device(dd->dev, dma_addr_in, length,
 320                                            DMA_TO_DEVICE);
 321         }
 322
 323         if (dd->flags & AES_FLAGS_CFB8) {
 324                 dd->dma_lch_in.dma_conf.dst_addr_width =
 325                         DMA_SLAVE_BUSWIDTH_1_BYTE;
 326                 dd->dma_lch_out.dma_conf.src_addr_width =
 327                         DMA_SLAVE_BUSWIDTH_1_BYTE;
 328         } else if (dd->flags & AES_FLAGS_CFB16) {
 329                 dd->dma_lch_in.dma_conf.dst_addr_width =
 330                         DMA_SLAVE_BUSWIDTH_2_BYTES;
 331                 dd->dma_lch_out.dma_conf.src_addr_width =
 332                         DMA_SLAVE_BUSWIDTH_2_BYTES;
 333         } else {
 334                 dd->dma_lch_in.dma_conf.dst_addr_width =
 335                         DMA_SLAVE_BUSWIDTH_4_BYTES;
 336                 dd->dma_lch_out.dma_conf.src_addr_width =
 337                         DMA_SLAVE_BUSWIDTH_4_BYTES;
 338         }
 339
 340         if (dd->flags & (AES_FLAGS_CFB8 | AES_FLAGS_CFB16 |
 341                         AES_FLAGS_CFB32 | AES_FLAGS_CFB64)) {
 342                 dd->dma_lch_in.dma_conf.src_maxburst = 1;
 343                 dd->dma_lch_in.dma_conf.dst_maxburst = 1;
 344                 dd->dma_lch_out.dma_conf.src_maxburst = 1;
 345                 dd->dma_lch_out.dma_conf.dst_maxburst = 1;
 346         } else {
 347                 dd->dma_lch_in.dma_conf.src_maxburst = dd->caps.max_burst_size;
 348                 dd->dma_lch_in.dma_conf.dst_maxburst = dd->caps.max_burst_size;
 349                 dd->dma_lch_out.dma_conf.src_maxburst = dd->caps.max_burst_size;
 350                 dd->dma_lch_out.dma_conf.dst_maxburst = dd->caps.max_burst_size;
 351         }
 352
 353         dmaengine_slave_config(dd->dma_lch_in.chan, &dd->dma_lch_in.dma_conf);
 354         dmaengine_slave_config(dd->dma_lch_out.chan, &dd->dma_lch_out.dma_conf);
 355
 356         dd->flags |= AES_FLAGS_DMA;
 357
 358         sg_init_table(&sg[0], 1);
 359         sg_dma_address(&sg[0]) = dma_addr_in;
 360         sg_dma_len(&sg[0]) = length;
 361
 362         sg_init_table(&sg[1], 1);
 363         sg_dma_address(&sg[1]) = dma_addr_out;
 364         sg_dma_len(&sg[1]) = length;
 365
 366         in_desc = dmaengine_prep_slave_sg(dd->dma_lch_in.chan, &sg[0],
 367                                 1, DMA_MEM_TO_DEV,
 368                                 DMA_PREP_INTERRUPT  |  DMA_CTRL_ACK);
 369         if (!in_desc)
 370                 return -EINVAL;
 371
 372         out_desc = dmaengine_prep_slave_sg(dd->dma_lch_out.chan, &sg[1],
 373                                 1, DMA_DEV_TO_MEM,
 374                                 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 375         if (!out_desc)
 376                 return -EINVAL;
 377
 378         out_desc->callback = atmel_aes_dma_callback;
 379         out_desc->callback_param = dd;
 380
 381         dmaengine_submit(out_desc);
 382         dma_async_issue_pending(dd->dma_lch_out.chan);
 383
 384         dmaengine_submit(in_desc);
 385         dma_async_issue_pending(dd->dma_lch_in.chan);
 386
 387         return 0;
 388 }
 389
 390 static int atmel_aes_crypt_cpu_start(struct atmel_aes_dev *dd)
 391 {
 392         dd->flags &= ~AES_FLAGS_DMA;
 393
 394         /* use cache buffers */
 395         dd->nb_in_sg = atmel_aes_sg_length(dd->req, dd->in_sg);
 396         if (!dd->nb_in_sg)
 397                 return -EINVAL;
 398
 399         dd->nb_out_sg = atmel_aes_sg_length(dd->req, dd->out_sg);
 400         if (!dd->nb_out_sg)
 401                 return -EINVAL;
 402
 403         dd->bufcnt = sg_copy_to_buffer(dd->in_sg, dd->nb_in_sg,
 404                                         dd->buf_in, dd->total);
 405
 406         if (!dd->bufcnt)
 407                 return -EINVAL;
 408
 409         dd->total -= dd->bufcnt;
 410
 411         atmel_aes_write(dd, AES_IER, AES_INT_DATARDY);
 412         atmel_aes_write_n(dd, AES_IDATAR(0), (u32 *) dd->buf_in,
 413                                 dd->bufcnt >> 2);
 414
 415         return 0;
 416 }
 417
 418 static int atmel_aes_crypt_dma_start(struct atmel_aes_dev *dd)
 419 {
 420         int err, fast = 0, in, out;
 421         size_t count;
 422         dma_addr_t addr_in, addr_out;
 423
 424         if ((!dd->in_offset) && (!dd->out_offset)) {
 425                 /* check for alignment */
 426                 in = IS_ALIGNED((u32)dd->in_sg->offset, sizeof(u32)) &&
 427                         IS_ALIGNED(dd->in_sg->length, dd->ctx->block_size);
 428                 out = IS_ALIGNED((u32)dd->out_sg->offset, sizeof(u32)) &&
 429                         IS_ALIGNED(dd->out_sg->length, dd->ctx->block_size);
 430                 fast = in && out;
 431
 432                 if (sg_dma_len(dd->in_sg) != sg_dma_len(dd->out_sg))
 433                         fast = 0;
 434         }
 435
 436
 437         if (fast)  {
 438                 count = min(dd->total, sg_dma_len(dd->in_sg));
 439                 count = min(count, sg_dma_len(dd->out_sg));
 440
 441                 err = dma_map_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
 442                 if (!err) {
 443                         dev_err(dd->dev, "dma_map_sg() error\n");
 444                         return -EINVAL;
 445                 }
 446
 447                 err = dma_map_sg(dd->dev, dd->out_sg, 1,
 448                                 DMA_FROM_DEVICE);
 449                 if (!err) {
 450                         dev_err(dd->dev, "dma_map_sg() error\n");
 451                         dma_unmap_sg(dd->dev, dd->in_sg, 1,
 452                                 DMA_TO_DEVICE);
 453                         return -EINVAL;
 454                 }
 455
 456                 addr_in = sg_dma_address(dd->in_sg);
 457                 addr_out = sg_dma_address(dd->out_sg);
 458
 459                 dd->flags |= AES_FLAGS_FAST;
 460
 461         } else {
 462                 /* use cache buffers */
 463                 count = atmel_aes_sg_copy(&dd->in_sg, &dd->in_offset,
 464                                 dd->buf_in, dd->buflen, dd->total, 0);
 465
 466                 addr_in = dd->dma_addr_in;
 467                 addr_out = dd->dma_addr_out;
 468
 469                 dd->flags &= ~AES_FLAGS_FAST;
 470         }
 471
 472         dd->total -= count;
 473
 474         err = atmel_aes_crypt_dma(dd, addr_in, addr_out, count);
 475
 476         if (err && (dd->flags & AES_FLAGS_FAST)) {
 477                 dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
 478                 dma_unmap_sg(dd->dev, dd->out_sg, 1, DMA_TO_DEVICE);
 479         }
 480
 481         return err;
 482 }
 483
 484 static int atmel_aes_write_ctrl(struct atmel_aes_dev *dd)
 485 {
 486         int err;
 487         u32 valcr = 0, valmr = 0;
 488
 489         err = atmel_aes_hw_init(dd);
 490
 491         if (err)
 492                 return err;
 493
 494         /* MR register must be set before IV registers */
 495         if (dd->ctx->keylen == AES_KEYSIZE_128)
 496                 valmr |= AES_MR_KEYSIZE_128;
 497         else if (dd->ctx->keylen == AES_KEYSIZE_192)
 498                 valmr |= AES_MR_KEYSIZE_192;
 499         else
 500                 valmr |= AES_MR_KEYSIZE_256;
 501
 502         if (dd->flags & AES_FLAGS_CBC) {
 503                 valmr |= AES_MR_OPMOD_CBC;
 504         } else if (dd->flags & AES_FLAGS_CFB) {
 505                 valmr |= AES_MR_OPMOD_CFB;
 506                 if (dd->flags & AES_FLAGS_CFB8)
 507                         valmr |= AES_MR_CFBS_8b;
 508                 else if (dd->flags & AES_FLAGS_CFB16)
 509                         valmr |= AES_MR_CFBS_16b;
 510                 else if (dd->flags & AES_FLAGS_CFB32)
 511                         valmr |= AES_MR_CFBS_32b;
 512                 else if (dd->flags & AES_FLAGS_CFB64)
 513                         valmr |= AES_MR_CFBS_64b;
 514                 else if (dd->flags & AES_FLAGS_CFB128)
 515                         valmr |= AES_MR_CFBS_128b;
 516         } else if (dd->flags & AES_FLAGS_OFB) {
 517                 valmr |= AES_MR_OPMOD_OFB;
 518         } else if (dd->flags & AES_FLAGS_CTR) {
 519                 valmr |= AES_MR_OPMOD_CTR;
 520         } else {
 521                 valmr |= AES_MR_OPMOD_ECB;
 522         }
 523
 524         if (dd->flags & AES_FLAGS_ENCRYPT)
 525                 valmr |= AES_MR_CYPHER_ENC;
 526
 527         if (dd->total > ATMEL_AES_DMA_THRESHOLD) {
 528                 valmr |= AES_MR_SMOD_IDATAR0;
 529                 if (dd->caps.has_dualbuff)
 530                         valmr |= AES_MR_DUALBUFF;
 531         } else {
 532                 valmr |= AES_MR_SMOD_AUTO;
 533         }
 534
 535         atmel_aes_write(dd, AES_CR, valcr);
 536         atmel_aes_write(dd, AES_MR, valmr);
 537
 538         atmel_aes_write_n(dd, AES_KEYWR(0), dd->ctx->key,
 539                                                 dd->ctx->keylen >> 2);
 540
 541         if (((dd->flags & AES_FLAGS_CBC) || (dd->flags & AES_FLAGS_CFB) ||
 542            (dd->flags & AES_FLAGS_OFB) || (dd->flags & AES_FLAGS_CTR)) &&
 543            dd->req->info) {
 544                 atmel_aes_write_n(dd, AES_IVR(0), dd->req->info, 4);
 545         }
 546
 547         return 0;
 548 }
 549
 550 static int atmel_aes_handle_queue(struct atmel_aes_dev *dd,
 551                                struct ablkcipher_request *req)
 552 {
 553         struct crypto_async_request *async_req, *backlog;
 554         struct atmel_aes_ctx *ctx;
 555         struct atmel_aes_reqctx *rctx;
 556         unsigned long flags;
 557         int err, ret = 0;
 558
 559         spin_lock_irqsave(&dd->lock, flags);
 560         if (req)
 561                 ret = ablkcipher_enqueue_request(&dd->queue, req);
 562         if (dd->flags & AES_FLAGS_BUSY) {
 563                 spin_unlock_irqrestore(&dd->lock, flags);
 564                 return ret;
 565         }
 566         backlog = crypto_get_backlog(&dd->queue);
 567         async_req = crypto_dequeue_request(&dd->queue);
 568         if (async_req)
 569                 dd->flags |= AES_FLAGS_BUSY;
 570         spin_unlock_irqrestore(&dd->lock, flags);
 571
 572         if (!async_req)
 573                 return ret;
 574
 575         if (backlog)
 576                 backlog->complete(backlog, -EINPROGRESS);
 577
 578         req = ablkcipher_request_cast(async_req);
 579
 580         /* assign new request to device */
 581         dd->req = req;
 582         dd->total = req->nbytes;
 583         dd->in_offset = 0;
 584         dd->in_sg = req->src;
 585         dd->out_offset = 0;
 586         dd->out_sg = req->dst;
 587
 588         rctx = ablkcipher_request_ctx(req);
 589         ctx = crypto_ablkcipher_ctx(crypto_ablkcipher_reqtfm(req));
 590         rctx->mode &= AES_FLAGS_MODE_MASK;
 591         dd->flags = (dd->flags & ~AES_FLAGS_MODE_MASK) | rctx->mode;
 592         dd->ctx = ctx;
 593         ctx->dd = dd;
 594
 595         err = atmel_aes_write_ctrl(dd);
 596         if (!err) {
 597                 if (dd->total > ATMEL_AES_DMA_THRESHOLD)
 598                         err = atmel_aes_crypt_dma_start(dd);
 599                 else
 600                         err = atmel_aes_crypt_cpu_start(dd);
 601         }
 602         if (err) {
 603                 /* aes_task will not finish it, so do it here */
 604                 atmel_aes_finish_req(dd, err);
 605                 tasklet_schedule(&dd->queue_task);
 606         }
 607
 608         return ret;
 609 }
 610
 611 static int atmel_aes_crypt_dma_stop(struct atmel_aes_dev *dd)
 612 {
 613         int err = -EINVAL;
 614         size_t count;
 615
 616         if (dd->flags & AES_FLAGS_DMA) {
 617                 err = 0;
 618                 if  (dd->flags & AES_FLAGS_FAST) {
 619                         dma_unmap_sg(dd->dev, dd->out_sg, 1, DMA_FROM_DEVICE);
 620                         dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
 621                 } else {
 622                         dma_sync_single_for_device(dd->dev, dd->dma_addr_out,
 623                                 dd->dma_size, DMA_FROM_DEVICE);
 624
 625                         /* copy data */
 626                         count = atmel_aes_sg_copy(&dd->out_sg, &dd->out_offset,
 627                                 dd->buf_out, dd->buflen, dd->dma_size, 1);
 628                         if (count != dd->dma_size) {
 629                                 err = -EINVAL;
 630                                 pr_err("not all data converted: %u\n", count);
 631                         }
 632                 }
 633         }
 634
 635         return err;
 636 }
 637
 638
 639 static int atmel_aes_buff_init(struct atmel_aes_dev *dd)
 640 {
 641         int err = -ENOMEM;
 642
 643         dd->buf_in = (void *)__get_free_pages(GFP_KERNEL, 0);
 644         dd->buf_out = (void *)__get_free_pages(GFP_KERNEL, 0);
 645         dd->buflen = PAGE_SIZE;
 646         dd->buflen &= ~(AES_BLOCK_SIZE - 1);
 647
 648         if (!dd->buf_in || !dd->buf_out) {
 649                 dev_err(dd->dev, "unable to alloc pages.\n");
 650                 goto err_alloc;
 651         }
 652
 653         /* MAP here */
 654         dd->dma_addr_in = dma_map_single(dd->dev, dd->buf_in,
 655                                         dd->buflen, DMA_TO_DEVICE);
 656         if (dma_mapping_error(dd->dev, dd->dma_addr_in)) {
 657                 dev_err(dd->dev, "dma %d bytes error\n", dd->buflen);
 658                 err = -EINVAL;
 659                 goto err_map_in;
 660         }
 661
 662         dd->dma_addr_out = dma_map_single(dd->dev, dd->buf_out,
 663                                         dd->buflen, DMA_FROM_DEVICE);
 664         if (dma_mapping_error(dd->dev, dd->dma_addr_out)) {
 665                 dev_err(dd->dev, "dma %d bytes error\n", dd->buflen);
 666                 err = -EINVAL;
 667                 goto err_map_out;
 668         }
 669
 670         return 0;
 671
 672 err_map_out:
 673         dma_unmap_single(dd->dev, dd->dma_addr_in, dd->buflen,
 674                 DMA_TO_DEVICE);
 675 err_map_in:
 676 err_alloc:
 677         free_page((unsigned long)dd->buf_out);
 678         free_page((unsigned long)dd->buf_in);
 679         if (err)
 680                 pr_err("error: %d\n", err);
 681         return err;
 682 }
 683
 684 static void atmel_aes_buff_cleanup(struct atmel_aes_dev *dd)
 685 {
 686         dma_unmap_single(dd->dev, dd->dma_addr_out, dd->buflen,
 687                          DMA_FROM_DEVICE);
 688         dma_unmap_single(dd->dev, dd->dma_addr_in, dd->buflen,
 689                 DMA_TO_DEVICE);
 690         free_page((unsigned long)dd->buf_out);
 691         free_page((unsigned long)dd->buf_in);
 692 }
 693
 694 static int atmel_aes_crypt(struct ablkcipher_request *req, unsigned long mode)
 695 {
 696         struct atmel_aes_ctx *ctx = crypto_ablkcipher_ctx(
 697                         crypto_ablkcipher_reqtfm(req));
 698         struct atmel_aes_reqctx *rctx = ablkcipher_request_ctx(req);
 699         struct atmel_aes_dev *dd;
 700
 701         if (mode & AES_FLAGS_CFB8) {
 702                 if (!IS_ALIGNED(req->nbytes, CFB8_BLOCK_SIZE)) {
 703                         pr_err("request size is not exact amount of CFB8 blocks\n");
 704                         return -EINVAL;
 705                 }
 706                 ctx->block_size = CFB8_BLOCK_SIZE;
 707         } else if (mode & AES_FLAGS_CFB16) {
 708                 if (!IS_ALIGNED(req->nbytes, CFB16_BLOCK_SIZE)) {
 709                         pr_err("request size is not exact amount of CFB16 blocks\n");
 710                         return -EINVAL;
 711                 }
 712                 ctx->block_size = CFB16_BLOCK_SIZE;
 713         } else if (mode & AES_FLAGS_CFB32) {
 714                 if (!IS_ALIGNED(req->nbytes, CFB32_BLOCK_SIZE)) {
 715                         pr_err("request size is not exact amount of CFB32 blocks\n");
 716                         return -EINVAL;
 717                 }
 718                 ctx->block_size = CFB32_BLOCK_SIZE;
 719         } else if (mode & AES_FLAGS_CFB64) {
 720                 if (!IS_ALIGNED(req->nbytes, CFB64_BLOCK_SIZE)) {
 721                         pr_err("request size is not exact amount of CFB64 blocks\n");
 722                         return -EINVAL;
 723                 }
 724                 ctx->block_size = CFB64_BLOCK_SIZE;
 725         } else {
 726                 if (!IS_ALIGNED(req->nbytes, AES_BLOCK_SIZE)) {
 727                         pr_err("request size is not exact amount of AES blocks\n");
 728                         return -EINVAL;
 729                 }
 730                 ctx->block_size = AES_BLOCK_SIZE;
 731         }
 732
 733         dd = atmel_aes_find_dev(ctx);
 734         if (!dd)
 735                 return -ENODEV;
 736
 737         rctx->mode = mode;
 738
 739         return atmel_aes_handle_queue(dd, req);
 740 }
 741
 742 static bool atmel_aes_filter(struct dma_chan *chan, void *slave)
 743 {
 744         struct at_dma_slave     *sl = slave;
 745
 746         if (sl && sl->dma_dev == chan->device->dev) {
 747                 chan->private = sl;
 748                 return true;
 749         } else {
 750                 return false;
 751         }
 752 }
 753
 754 static int atmel_aes_dma_init(struct atmel_aes_dev *dd,
 755         struct crypto_platform_data *pdata)
 756 {
 757         int err = -ENOMEM;
 758         dma_cap_mask_t mask;
 759
 760         dma_cap_zero(mask);
 761         dma_cap_set(DMA_SLAVE, mask);
 762
 763         /* Try to grab 2 DMA channels */
 764         dd->dma_lch_in.chan = dma_request_slave_channel_compat(mask,
 765                         atmel_aes_filter, &pdata->dma_slave->rxdata, dd->dev, "tx");
 766         if (!dd->dma_lch_in.chan)
 767                 goto err_dma_in;
 768
 769         dd->dma_lch_in.dma_conf.direction = DMA_MEM_TO_DEV;
 770         dd->dma_lch_in.dma_conf.dst_addr = dd->phys_base +
 771                 AES_IDATAR(0);
 772         dd->dma_lch_in.dma_conf.src_maxburst = dd->caps.max_burst_size;
 773         dd->dma_lch_in.dma_conf.src_addr_width =
 774                 DMA_SLAVE_BUSWIDTH_4_BYTES;
 775         dd->dma_lch_in.dma_conf.dst_maxburst = dd->caps.max_burst_size;
 776         dd->dma_lch_in.dma_conf.dst_addr_width =
 777                 DMA_SLAVE_BUSWIDTH_4_BYTES;
 778         dd->dma_lch_in.dma_conf.device_fc = false;
 779
 780         dd->dma_lch_out.chan = dma_request_slave_channel_compat(mask,
 781                         atmel_aes_filter, &pdata->dma_slave->txdata, dd->dev, "rx");
 782         if (!dd->dma_lch_out.chan)
 783                 goto err_dma_out;
 784
 785         dd->dma_lch_out.dma_conf.direction = DMA_DEV_TO_MEM;
 786         dd->dma_lch_out.dma_conf.src_addr = dd->phys_base +
 787                 AES_ODATAR(0);
 788         dd->dma_lch_out.dma_conf.src_maxburst = dd->caps.max_burst_size;
 789         dd->dma_lch_out.dma_conf.src_addr_width =
 790                 DMA_SLAVE_BUSWIDTH_4_BYTES;
 791         dd->dma_lch_out.dma_conf.dst_maxburst = dd->caps.max_burst_size;
 792         dd->dma_lch_out.dma_conf.dst_addr_width =
 793                 DMA_SLAVE_BUSWIDTH_4_BYTES;
 794         dd->dma_lch_out.dma_conf.device_fc = false;
 795
 796         return 0;
 797
 798 err_dma_out:
 799         dma_release_channel(dd->dma_lch_in.chan);
 800 err_dma_in:
 801         dev_warn(dd->dev, "no DMA channel available\n");
 802         return err;
 803 }
 804
 805 static void atmel_aes_dma_cleanup(struct atmel_aes_dev *dd)
 806 {
 807         dma_release_channel(dd->dma_lch_in.chan);
 808         dma_release_channel(dd->dma_lch_out.chan);
 809 }
 810
 811 static int atmel_aes_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
 812                            unsigned int keylen)
 813 {
 814         struct atmel_aes_ctx *ctx = crypto_ablkcipher_ctx(tfm);
 815
 816         if (keylen != AES_KEYSIZE_128 && keylen != AES_KEYSIZE_192 &&
 817                    keylen != AES_KEYSIZE_256) {
 818                 crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
 819                 return -EINVAL;
 820         }
 821
 822         memcpy(ctx->key, key, keylen);
 823         ctx->keylen = keylen;
 824
 825         return 0;
 826 }
 827
 828 static int atmel_aes_ecb_encrypt(struct ablkcipher_request *req)
 829 {
 830         return atmel_aes_crypt(req,
 831                 AES_FLAGS_ENCRYPT);
 832 }
 833
 834 static int atmel_aes_ecb_decrypt(struct ablkcipher_request *req)
 835 {
 836         return atmel_aes_crypt(req,
 837                 0);
 838 }
 839
 840 static int atmel_aes_cbc_encrypt(struct ablkcipher_request *req)
 841 {
 842         return atmel_aes_crypt(req,
 843                 AES_FLAGS_ENCRYPT | AES_FLAGS_CBC);
 844 }
 845
 846 static int atmel_aes_cbc_decrypt(struct ablkcipher_request *req)
 847 {
 848         return atmel_aes_crypt(req,
 849                 AES_FLAGS_CBC);
 850 }
 851
 852 static int atmel_aes_ofb_encrypt(struct ablkcipher_request *req)
 853 {
 854         return atmel_aes_crypt(req,
 855                 AES_FLAGS_ENCRYPT | AES_FLAGS_OFB);
 856 }
 857
 858 static int atmel_aes_ofb_decrypt(struct ablkcipher_request *req)
 859 {
 860         return atmel_aes_crypt(req,
 861                 AES_FLAGS_OFB);
 862 }
 863
 864 static int atmel_aes_cfb_encrypt(struct ablkcipher_request *req)
 865 {
 866         return atmel_aes_crypt(req,
 867                 AES_FLAGS_ENCRYPT | AES_FLAGS_CFB | AES_FLAGS_CFB128);
 868 }
 869
 870 static int atmel_aes_cfb_decrypt(struct ablkcipher_request *req)
 871 {
 872         return atmel_aes_crypt(req,
 873                 AES_FLAGS_CFB | AES_FLAGS_CFB128);
 874 }
 875
 876 static int atmel_aes_cfb64_encrypt(struct ablkcipher_request *req)
 877 {
 878         return atmel_aes_crypt(req,
 879                 AES_FLAGS_ENCRYPT | AES_FLAGS_CFB | AES_FLAGS_CFB64);
 880 }
 881
 882 static int atmel_aes_cfb64_decrypt(struct ablkcipher_request *req)
 883 {
 884         return atmel_aes_crypt(req,
 885                 AES_FLAGS_CFB | AES_FLAGS_CFB64);
 886 }
 887
 888 static int atmel_aes_cfb32_encrypt(struct ablkcipher_request *req)
 889 {
 890         return atmel_aes_crypt(req,
 891                 AES_FLAGS_ENCRYPT | AES_FLAGS_CFB | AES_FLAGS_CFB32);
 892 }
 893
 894 static int atmel_aes_cfb32_decrypt(struct ablkcipher_request *req)
 895 {
 896         return atmel_aes_crypt(req,
 897                 AES_FLAGS_CFB | AES_FLAGS_CFB32);
 898 }
 899
 900 static int atmel_aes_cfb16_encrypt(struct ablkcipher_request *req)
 901 {
 902         return atmel_aes_crypt(req,
 903                 AES_FLAGS_ENCRYPT | AES_FLAGS_CFB | AES_FLAGS_CFB16);
 904 }
 905
 906 static int atmel_aes_cfb16_decrypt(struct ablkcipher_request *req)
 907 {
 908         return atmel_aes_crypt(req,
 909                 AES_FLAGS_CFB | AES_FLAGS_CFB16);
 910 }
 911
 912 static int atmel_aes_cfb8_encrypt(struct ablkcipher_request *req)
 913 {
 914         return atmel_aes_crypt(req,
 915                 AES_FLAGS_ENCRYPT |     AES_FLAGS_CFB | AES_FLAGS_CFB8);
 916 }
 917
 918 static int atmel_aes_cfb8_decrypt(struct ablkcipher_request *req)
 919 {
 920         return atmel_aes_crypt(req,
 921                 AES_FLAGS_CFB | AES_FLAGS_CFB8);
 922 }
 923
 924 static int atmel_aes_ctr_encrypt(struct ablkcipher_request *req)
 925 {
 926         return atmel_aes_crypt(req,
 927                 AES_FLAGS_ENCRYPT | AES_FLAGS_CTR);
 928 }
 929
 930 static int atmel_aes_ctr_decrypt(struct ablkcipher_request *req)
 931 {
 932         return atmel_aes_crypt(req,
 933                 AES_FLAGS_CTR);
 934 }
 935
 936 static int atmel_aes_cra_init(struct crypto_tfm *tfm)
 937 {
 938         tfm->crt_ablkcipher.reqsize = sizeof(struct atmel_aes_reqctx);
 939
 940         return 0;
 941 }
 942
 943 static void atmel_aes_cra_exit(struct crypto_tfm *tfm)
 944 {
 945 }
 946
 947 static struct crypto_alg aes_algs[] = {
 948 {
 949         .cra_name               = "ecb(aes)",
 950         .cra_driver_name        = "atmel-ecb-aes",
 951         .cra_priority           = 100,
 952         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
 953         .cra_blocksize          = AES_BLOCK_SIZE,
 954         .cra_ctxsize            = sizeof(struct atmel_aes_ctx),
 955         .cra_alignmask          = 0xf,
 956         .cra_type               = &crypto_ablkcipher_type,
 957         .cra_module             = THIS_MODULE,
 958         .cra_init               = atmel_aes_cra_init,
 959         .cra_exit               = atmel_aes_cra_exit,
 960         .cra_u.ablkcipher = {
 961                 .min_keysize    = AES_MIN_KEY_SIZE,
 962                 .max_keysize    = AES_MAX_KEY_SIZE,
 963                 .setkey         = atmel_aes_setkey,
 964                 .encrypt        = atmel_aes_ecb_encrypt,
 965                 .decrypt        = atmel_aes_ecb_decrypt,
 966         }
 967 },
 968 {
 969         .cra_name               = "cbc(aes)",
 970         .cra_driver_name        = "atmel-cbc-aes",
 971         .cra_priority           = 100,
 972         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
 973         .cra_blocksize          = AES_BLOCK_SIZE,
 974         .cra_ctxsize            = sizeof(struct atmel_aes_ctx),
 975         .cra_alignmask          = 0xf,
 976         .cra_type               = &crypto_ablkcipher_type,
 977         .cra_module             = THIS_MODULE,
 978         .cra_init               = atmel_aes_cra_init,
 979         .cra_exit               = atmel_aes_cra_exit,
 980         .cra_u.ablkcipher = {
 981                 .min_keysize    = AES_MIN_KEY_SIZE,
 982                 .max_keysize    = AES_MAX_KEY_SIZE,
 983                 .ivsize         = AES_BLOCK_SIZE,
 984                 .setkey         = atmel_aes_setkey,
 985                 .encrypt        = atmel_aes_cbc_encrypt,
 986                 .decrypt        = atmel_aes_cbc_decrypt,
 987         }
 988 },
 989 {
 990         .cra_name               = "ofb(aes)",
 991         .cra_driver_name        = "atmel-ofb-aes",
 992         .cra_priority           = 100,
 993         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
 994         .cra_blocksize          = AES_BLOCK_SIZE,
 995         .cra_ctxsize            = sizeof(struct atmel_aes_ctx),
 996         .cra_alignmask          = 0xf,
 997         .cra_type               = &crypto_ablkcipher_type,
 998         .cra_module             = THIS_MODULE,
 999         .cra_init               = atmel_aes_cra_init,
1000         .cra_exit               = atmel_aes_cra_exit,
1001         .cra_u.ablkcipher = {
1002                 .min_keysize    = AES_MIN_KEY_SIZE,
1003                 .max_keysize    = AES_MAX_KEY_SIZE,
1004                 .ivsize         = AES_BLOCK_SIZE,
1005                 .setkey         = atmel_aes_setkey,
1006                 .encrypt        = atmel_aes_ofb_encrypt,
1007                 .decrypt        = atmel_aes_ofb_decrypt,
1008         }
1009 },
1010 {
1011         .cra_name               = "cfb(aes)",
1012         .cra_driver_name        = "atmel-cfb-aes",
1013         .cra_priority           = 100,
1014         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1015         .cra_blocksize          = AES_BLOCK_SIZE,
1016         .cra_ctxsize            = sizeof(struct atmel_aes_ctx),
1017         .cra_alignmask          = 0xf,
1018         .cra_type               = &crypto_ablkcipher_type,
1019         .cra_module             = THIS_MODULE,
1020         .cra_init               = atmel_aes_cra_init,
1021         .cra_exit               = atmel_aes_cra_exit,
1022         .cra_u.ablkcipher = {
1023                 .min_keysize    = AES_MIN_KEY_SIZE,
1024                 .max_keysize    = AES_MAX_KEY_SIZE,
1025                 .ivsize         = AES_BLOCK_SIZE,
1026                 .setkey         = atmel_aes_setkey,
1027                 .encrypt        = atmel_aes_cfb_encrypt,
1028                 .decrypt        = atmel_aes_cfb_decrypt,
1029         }
1030 },
1031 {
1032         .cra_name               = "cfb32(aes)",
1033         .cra_driver_name        = "atmel-cfb32-aes",
1034         .cra_priority           = 100,
1035         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1036         .cra_blocksize          = CFB32_BLOCK_SIZE,
1037         .cra_ctxsize            = sizeof(struct atmel_aes_ctx),
1038         .cra_alignmask          = 0x3,
1039         .cra_type               = &crypto_ablkcipher_type,
1040         .cra_module             = THIS_MODULE,
1041         .cra_init               = atmel_aes_cra_init,
1042         .cra_exit               = atmel_aes_cra_exit,
1043         .cra_u.ablkcipher = {
1044                 .min_keysize    = AES_MIN_KEY_SIZE,
1045                 .max_keysize    = AES_MAX_KEY_SIZE,
1046                 .ivsize         = AES_BLOCK_SIZE,
1047                 .setkey         = atmel_aes_setkey,
1048                 .encrypt        = atmel_aes_cfb32_encrypt,
1049                 .decrypt        = atmel_aes_cfb32_decrypt,
1050         }
1051 },
1052 {
1053         .cra_name               = "cfb16(aes)",
1054         .cra_driver_name        = "atmel-cfb16-aes",
1055         .cra_priority           = 100,
1056         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1057         .cra_blocksize          = CFB16_BLOCK_SIZE,
1058         .cra_ctxsize            = sizeof(struct atmel_aes_ctx),
1059         .cra_alignmask          = 0x1,
1060         .cra_type               = &crypto_ablkcipher_type,
1061         .cra_module             = THIS_MODULE,
1062         .cra_init               = atmel_aes_cra_init,
1063         .cra_exit               = atmel_aes_cra_exit,
1064         .cra_u.ablkcipher = {
1065                 .min_keysize    = AES_MIN_KEY_SIZE,
1066                 .max_keysize    = AES_MAX_KEY_SIZE,
1067                 .ivsize         = AES_BLOCK_SIZE,
1068                 .setkey         = atmel_aes_setkey,
1069                 .encrypt        = atmel_aes_cfb16_encrypt,
1070                 .decrypt        = atmel_aes_cfb16_decrypt,
1071         }
1072 },
1073 {
1074         .cra_name               = "cfb8(aes)",
1075         .cra_driver_name        = "atmel-cfb8-aes",
1076         .cra_priority           = 100,
1077         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1078         .cra_blocksize          = CFB8_BLOCK_SIZE,
1079         .cra_ctxsize            = sizeof(struct atmel_aes_ctx),
1080         .cra_alignmask          = 0x0,
1081         .cra_type               = &crypto_ablkcipher_type,
1082         .cra_module             = THIS_MODULE,
1083         .cra_init               = atmel_aes_cra_init,
1084         .cra_exit               = atmel_aes_cra_exit,
1085         .cra_u.ablkcipher = {
1086                 .min_keysize    = AES_MIN_KEY_SIZE,
1087                 .max_keysize    = AES_MAX_KEY_SIZE,
1088                 .ivsize         = AES_BLOCK_SIZE,
1089                 .setkey         = atmel_aes_setkey,
1090                 .encrypt        = atmel_aes_cfb8_encrypt,
1091                 .decrypt        = atmel_aes_cfb8_decrypt,
1092         }
1093 },
1094 {
1095         .cra_name               = "ctr(aes)",
1096         .cra_driver_name        = "atmel-ctr-aes",
1097         .cra_priority           = 100,
1098         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1099         .cra_blocksize          = AES_BLOCK_SIZE,
1100         .cra_ctxsize            = sizeof(struct atmel_aes_ctx),
1101         .cra_alignmask          = 0xf,
1102         .cra_type               = &crypto_ablkcipher_type,
1103         .cra_module             = THIS_MODULE,
1104         .cra_init               = atmel_aes_cra_init,
1105         .cra_exit               = atmel_aes_cra_exit,
1106         .cra_u.ablkcipher = {
1107                 .min_keysize    = AES_MIN_KEY_SIZE,
1108                 .max_keysize    = AES_MAX_KEY_SIZE,
1109                 .ivsize         = AES_BLOCK_SIZE,
1110                 .setkey         = atmel_aes_setkey,
1111                 .encrypt        = atmel_aes_ctr_encrypt,
1112                 .decrypt        = atmel_aes_ctr_decrypt,
1113         }
1114 },
1115 };
1116
1117 static struct crypto_alg aes_cfb64_alg = {
1118         .cra_name               = "cfb64(aes)",
1119         .cra_driver_name        = "atmel-cfb64-aes",
1120         .cra_priority           = 100,
1121         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1122         .cra_blocksize          = CFB64_BLOCK_SIZE,
1123         .cra_ctxsize            = sizeof(struct atmel_aes_ctx),
1124         .cra_alignmask          = 0x7,
1125         .cra_type               = &crypto_ablkcipher_type,
1126         .cra_module             = THIS_MODULE,
1127         .cra_init               = atmel_aes_cra_init,
1128         .cra_exit               = atmel_aes_cra_exit,
1129         .cra_u.ablkcipher = {
1130                 .min_keysize    = AES_MIN_KEY_SIZE,
1131                 .max_keysize    = AES_MAX_KEY_SIZE,
1132                 .ivsize         = AES_BLOCK_SIZE,
1133                 .setkey         = atmel_aes_setkey,
1134                 .encrypt        = atmel_aes_cfb64_encrypt,
1135                 .decrypt        = atmel_aes_cfb64_decrypt,
1136         }
1137 };
1138
1139 static void atmel_aes_queue_task(unsigned long data)
1140 {
1141         struct atmel_aes_dev *dd = (struct atmel_aes_dev *)data;
1142
1143         atmel_aes_handle_queue(dd, NULL);
1144 }
1145
1146 static void atmel_aes_done_task(unsigned long data)
1147 {
1148         struct atmel_aes_dev *dd = (struct atmel_aes_dev *) data;
1149         int err;
1150
1151         if (!(dd->flags & AES_FLAGS_DMA)) {
1152                 atmel_aes_read_n(dd, AES_ODATAR(0), (u32 *) dd->buf_out,
1153                                 dd->bufcnt >> 2);
1154
1155                 if (sg_copy_from_buffer(dd->out_sg, dd->nb_out_sg,
1156                         dd->buf_out, dd->bufcnt))
1157                         err = 0;
1158                 else
1159                         err = -EINVAL;
1160
1161                 goto cpu_end;
1162         }
1163
1164         err = atmel_aes_crypt_dma_stop(dd);
1165
1166         err = dd->err ? : err;
1167
1168         if (dd->total && !err) {
1169                 if (dd->flags & AES_FLAGS_FAST) {
1170                         dd->in_sg = sg_next(dd->in_sg);
1171                         dd->out_sg = sg_next(dd->out_sg);
1172                         if (!dd->in_sg || !dd->out_sg)
1173                                 err = -EINVAL;
1174                 }
1175                 if (!err)
1176                         err = atmel_aes_crypt_dma_start(dd);
1177                 if (!err)
1178                         return; /* DMA started. Not fininishing. */
1179         }
1180
1181 cpu_end:
1182         atmel_aes_finish_req(dd, err);
1183         atmel_aes_handle_queue(dd, NULL);
1184 }
1185
1186 static irqreturn_t atmel_aes_irq(int irq, void *dev_id)
1187 {
1188         struct atmel_aes_dev *aes_dd = dev_id;
1189         u32 reg;
1190
1191         reg = atmel_aes_read(aes_dd, AES_ISR);
1192         if (reg & atmel_aes_read(aes_dd, AES_IMR)) {
1193                 atmel_aes_write(aes_dd, AES_IDR, reg);
1194                 if (AES_FLAGS_BUSY & aes_dd->flags)
1195                         tasklet_schedule(&aes_dd->done_task);
1196                 else
1197                         dev_warn(aes_dd->dev, "AES interrupt when no active requests.\n");
1198                 return IRQ_HANDLED;
1199         }
1200
1201         return IRQ_NONE;
1202 }
1203
1204 static void atmel_aes_unregister_algs(struct atmel_aes_dev *dd)
1205 {
1206         int i;
1207
1208         for (i = 0; i < ARRAY_SIZE(aes_algs); i++)
1209                 crypto_unregister_alg(&aes_algs[i]);
1210         if (dd->caps.has_cfb64)
1211                 crypto_unregister_alg(&aes_cfb64_alg);
1212 }
1213
1214 static int atmel_aes_register_algs(struct atmel_aes_dev *dd)
1215 {
1216         int err, i, j;
1217
1218         for (i = 0; i < ARRAY_SIZE(aes_algs); i++) {
1219                 err = crypto_register_alg(&aes_algs[i]);
1220                 if (err)
1221                         goto err_aes_algs;
1222         }
1223
1224         if (dd->caps.has_cfb64) {
1225                 err = crypto_register_alg(&aes_cfb64_alg);
1226                 if (err)
1227                         goto err_aes_cfb64_alg;
1228         }
1229
1230         return 0;
1231
1232 err_aes_cfb64_alg:
1233         i = ARRAY_SIZE(aes_algs);
1234 err_aes_algs:
1235         for (j = 0; j < i; j++)
1236                 crypto_unregister_alg(&aes_algs[j]);
1237
1238         return err;
1239 }
1240
1241 static void atmel_aes_get_cap(struct atmel_aes_dev *dd)
1242 {
1243         dd->caps.has_dualbuff = 0;
1244         dd->caps.has_cfb64 = 0;
1245         dd->caps.max_burst_size = 1;
1246
1247         /* keep only major version number */
1248         switch (dd->hw_version & 0xff0) {
1249         case 0x130:
1250                 dd->caps.has_dualbuff = 1;
1251                 dd->caps.has_cfb64 = 1;
1252                 dd->caps.max_burst_size = 4;
1253                 break;
1254         case 0x120:
1255                 break;
1256         default:
1257                 dev_warn(dd->dev,
1258                                 "Unmanaged aes version, set minimum capabilities\n");
1259                 break;
1260         }
1261 }
1262
1263 #if defined(CONFIG_OF)
1264 static const struct of_device_id atmel_aes_dt_ids[] = {
1265         { .compatible = "atmel,at91sam9g46-aes" },
1266         { /* sentinel */ }
1267 };
1268 MODULE_DEVICE_TABLE(of, atmel_aes_dt_ids);
1269
1270 static struct crypto_platform_data *atmel_aes_of_init(struct platform_device *pdev)
1271 {
1272         struct device_node *np = pdev->dev.of_node;
1273         struct crypto_platform_data *pdata;
1274
1275         if (!np) {
1276                 dev_err(&pdev->dev, "device node not found\n");
1277                 return ERR_PTR(-EINVAL);
1278         }
1279
1280         pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
1281         if (!pdata) {
1282                 dev_err(&pdev->dev, "could not allocate memory for pdata\n");
1283                 return ERR_PTR(-ENOMEM);
1284         }
1285
1286         pdata->dma_slave = devm_kzalloc(&pdev->dev,
1287                                         sizeof(*(pdata->dma_slave)),
1288                                         GFP_KERNEL);
1289         if (!pdata->dma_slave) {
1290                 dev_err(&pdev->dev, "could not allocate memory for dma_slave\n");
1291                 devm_kfree(&pdev->dev, pdata);
1292                 return ERR_PTR(-ENOMEM);
1293         }
1294
1295         return pdata;
1296 }
1297 #else
1298 static inline struct crypto_platform_data *atmel_aes_of_init(struct platform_device *pdev)
1299 {
1300         return ERR_PTR(-EINVAL);
1301 }
1302 #endif
1303
1304 static int atmel_aes_probe(struct platform_device *pdev)
1305 {
1306         struct atmel_aes_dev *aes_dd;
1307         struct crypto_platform_data *pdata;
1308         struct device *dev = &pdev->dev;
1309         struct resource *aes_res;
1310         unsigned long aes_phys_size;
1311         int err;
1312
1313         pdata = pdev->dev.platform_data;
1314         if (!pdata) {
1315                 pdata = atmel_aes_of_init(pdev);
1316                 if (IS_ERR(pdata)) {
1317                         err = PTR_ERR(pdata);
1318                         goto aes_dd_err;
1319                 }
1320         }
1321
1322         if (!pdata->dma_slave) {
1323                 err = -ENXIO;
1324                 goto aes_dd_err;
1325         }
1326
1327         aes_dd = kzalloc(sizeof(struct atmel_aes_dev), GFP_KERNEL);
1328         if (aes_dd == NULL) {
1329                 dev_err(dev, "unable to alloc data struct.\n");
1330                 err = -ENOMEM;
1331                 goto aes_dd_err;
1332         }
1333
1334         aes_dd->dev = dev;
1335
1336         platform_set_drvdata(pdev, aes_dd);
1337
1338         INIT_LIST_HEAD(&aes_dd->list);
1339
1340         tasklet_init(&aes_dd->done_task, atmel_aes_done_task,
1341                                         (unsigned long)aes_dd);
1342         tasklet_init(&aes_dd->queue_task, atmel_aes_queue_task,
1343                                         (unsigned long)aes_dd);
1344
1345         crypto_init_queue(&aes_dd->queue, ATMEL_AES_QUEUE_LENGTH);
1346
1347         aes_dd->irq = -1;
1348
1349         /* Get the base address */
1350         aes_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1351         if (!aes_res) {
1352                 dev_err(dev, "no MEM resource info\n");
1353                 err = -ENODEV;
1354                 goto res_err;
1355         }
1356         aes_dd->phys_base = aes_res->start;
1357         aes_phys_size = resource_size(aes_res);
1358
1359         /* Get the IRQ */
1360         aes_dd->irq = platform_get_irq(pdev,  0);
1361         if (aes_dd->irq < 0) {
1362                 dev_err(dev, "no IRQ resource info\n");
1363                 err = aes_dd->irq;
1364                 goto aes_irq_err;
1365         }
1366
1367         err = request_irq(aes_dd->irq, atmel_aes_irq, IRQF_SHARED, "atmel-aes",
1368                                                 aes_dd);
1369         if (err) {
1370                 dev_err(dev, "unable to request aes irq.\n");
1371                 goto aes_irq_err;
1372         }
1373
1374         /* Initializing the clock */
1375         aes_dd->iclk = clk_get(&pdev->dev, "aes_clk");
1376         if (IS_ERR(aes_dd->iclk)) {
1377                 dev_err(dev, "clock intialization failed.\n");
1378                 err = PTR_ERR(aes_dd->iclk);
1379                 goto clk_err;
1380         }
1381
1382         aes_dd->io_base = ioremap(aes_dd->phys_base, aes_phys_size);
1383         if (!aes_dd->io_base) {
1384                 dev_err(dev, "can't ioremap\n");
1385                 err = -ENOMEM;
1386                 goto aes_io_err;
1387         }
1388
1389         atmel_aes_hw_version_init(aes_dd);
1390
1391         atmel_aes_get_cap(aes_dd);
1392
1393         err = atmel_aes_buff_init(aes_dd);
1394         if (err)
1395                 goto err_aes_buff;
1396
1397         err = atmel_aes_dma_init(aes_dd, pdata);
1398         if (err)
1399                 goto err_aes_dma;
1400
1401         spin_lock(&atmel_aes.lock);
1402         list_add_tail(&aes_dd->list, &atmel_aes.dev_list);
1403         spin_unlock(&atmel_aes.lock);
1404
1405         err = atmel_aes_register_algs(aes_dd);
1406         if (err)
1407                 goto err_algs;
1408
1409         dev_info(dev, "Atmel AES - Using %s, %s for DMA transfers\n",
1410                         dma_chan_name(aes_dd->dma_lch_in.chan),
1411                         dma_chan_name(aes_dd->dma_lch_out.chan));
1412
1413         return 0;
1414
1415 err_algs:
1416         spin_lock(&atmel_aes.lock);
1417         list_del(&aes_dd->list);
1418         spin_unlock(&atmel_aes.lock);
1419         atmel_aes_dma_cleanup(aes_dd);
1420 err_aes_dma:
1421         atmel_aes_buff_cleanup(aes_dd);
1422 err_aes_buff:
1423         iounmap(aes_dd->io_base);
1424 aes_io_err:
1425         clk_put(aes_dd->iclk);
1426 clk_err:
1427         free_irq(aes_dd->irq, aes_dd);
1428 aes_irq_err:
1429 res_err:
1430         tasklet_kill(&aes_dd->done_task);
1431         tasklet_kill(&aes_dd->queue_task);
1432         kfree(aes_dd);
1433         aes_dd = NULL;
1434 aes_dd_err:
1435         dev_err(dev, "initialization failed.\n");
1436
1437         return err;
1438 }
1439
1440 static int atmel_aes_remove(struct platform_device *pdev)
1441 {
1442         static struct atmel_aes_dev *aes_dd;
1443
1444         aes_dd = platform_get_drvdata(pdev);
1445         if (!aes_dd)
1446                 return -ENODEV;
1447         spin_lock(&atmel_aes.lock);
1448         list_del(&aes_dd->list);
1449         spin_unlock(&atmel_aes.lock);
1450
1451         atmel_aes_unregister_algs(aes_dd);
1452
1453         tasklet_kill(&aes_dd->done_task);
1454         tasklet_kill(&aes_dd->queue_task);
1455
1456         atmel_aes_dma_cleanup(aes_dd);
1457
1458         iounmap(aes_dd->io_base);
1459
1460         clk_put(aes_dd->iclk);
1461
1462         if (aes_dd->irq > 0)
1463                 free_irq(aes_dd->irq, aes_dd);
1464
1465         kfree(aes_dd);
1466         aes_dd = NULL;
1467
1468         return 0;
1469 }
1470
1471 static struct platform_driver atmel_aes_driver = {
1472         .probe          = atmel_aes_probe,
1473         .remove         = atmel_aes_remove,
1474         .driver         = {
1475                 .name   = "atmel_aes",
1476                 .of_match_table = of_match_ptr(atmel_aes_dt_ids),
1477         },
1478 };
1479
1480 module_platform_driver(atmel_aes_driver);
1481
1482 MODULE_DESCRIPTION("Atmel AES hw acceleration support.");
1483 MODULE_LICENSE("GPL v2");
1484 MODULE_AUTHOR("Nicolas Royer - Eukréa Electromatique");