drivers/crypto/omap-des.c

   1 /*
   2  * Support for OMAP DES and Triple DES HW acceleration.
   3  *
   4  * Copyright (c) 2013 Texas Instruments Incorporated
   5  * Author: Joel Fernandes <[email protected]>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as published
   9  * by the Free Software Foundation.
  10  *
  11  */
  12
  13 #define pr_fmt(fmt) "%s: " fmt, __func__
  14
  15 #ifdef DEBUG
  16 #define prn(num) printk(#num "=%d\n", num)
  17 #define prx(num) printk(#num "=%x\n", num)
  18 #else
  19 #define prn(num) do { } while (0)
  20 #define prx(num)  do { } while (0)
  21 #endif
  22
  23 #include <linux/err.h>
  24 #include <linux/module.h>
  25 #include <linux/init.h>
  26 #include <linux/errno.h>
  27 #include <linux/kernel.h>
  28 #include <linux/platform_device.h>
  29 #include <linux/scatterlist.h>
  30 #include <linux/dma-mapping.h>
  31 #include <linux/dmaengine.h>
  32 #include <linux/omap-dma.h>
  33 #include <linux/pm_runtime.h>
  34 #include <linux/of.h>
  35 #include <linux/of_device.h>
  36 #include <linux/of_address.h>
  37 #include <linux/io.h>
  38 #include <linux/crypto.h>
  39 #include <linux/interrupt.h>
  40 #include <crypto/scatterwalk.h>
  41 #include <crypto/des.h>
  42
  43 #define DST_MAXBURST                    2
  44
  45 #define DES_BLOCK_WORDS         (DES_BLOCK_SIZE >> 2)
  46
  47 #define _calc_walked(inout) (dd->inout##_walk.offset - dd->inout##_sg->offset)
  48
  49 #define DES_REG_KEY(dd, x)              ((dd)->pdata->key_ofs - \
  50                                                 ((x ^ 0x01) * 0x04))
  51
  52 #define DES_REG_IV(dd, x)               ((dd)->pdata->iv_ofs + ((x) * 0x04))
  53
  54 #define DES_REG_CTRL(dd)                ((dd)->pdata->ctrl_ofs)
  55 #define DES_REG_CTRL_CBC                BIT(4)
  56 #define DES_REG_CTRL_TDES               BIT(3)
  57 #define DES_REG_CTRL_DIRECTION          BIT(2)
  58 #define DES_REG_CTRL_INPUT_READY        BIT(1)
  59 #define DES_REG_CTRL_OUTPUT_READY       BIT(0)
  60
  61 #define DES_REG_DATA_N(dd, x)           ((dd)->pdata->data_ofs + ((x) * 0x04))
  62
  63 #define DES_REG_REV(dd)                 ((dd)->pdata->rev_ofs)
  64
  65 #define DES_REG_MASK(dd)                ((dd)->pdata->mask_ofs)
  66
  67 #define DES_REG_LENGTH_N(x)             (0x24 + ((x) * 0x04))
  68
  69 #define DES_REG_IRQ_STATUS(dd)         ((dd)->pdata->irq_status_ofs)
  70 #define DES_REG_IRQ_ENABLE(dd)         ((dd)->pdata->irq_enable_ofs)
  71 #define DES_REG_IRQ_DATA_IN            BIT(1)
  72 #define DES_REG_IRQ_DATA_OUT           BIT(2)
  73
  74 #define FLAGS_MODE_MASK         0x000f
  75 #define FLAGS_ENCRYPT           BIT(0)
  76 #define FLAGS_CBC               BIT(1)
  77 #define FLAGS_INIT              BIT(4)
  78 #define FLAGS_BUSY              BIT(6)
  79
  80 struct omap_des_ctx {
  81         struct omap_des_dev *dd;
  82
  83         int             keylen;
  84         u32             key[(3 * DES_KEY_SIZE) / sizeof(u32)];
  85         unsigned long   flags;
  86 };
  87
  88 struct omap_des_reqctx {
  89         unsigned long mode;
  90 };
  91
  92 #define OMAP_DES_QUEUE_LENGTH   1
  93 #define OMAP_DES_CACHE_SIZE     0
  94
  95 struct omap_des_algs_info {
  96         struct crypto_alg       *algs_list;
  97         unsigned int            size;
  98         unsigned int            registered;
  99 };
 100
 101 struct omap_des_pdata {
 102         struct omap_des_algs_info       *algs_info;
 103         unsigned int    algs_info_size;
 104
 105         void            (*trigger)(struct omap_des_dev *dd, int length);
 106
 107         u32             key_ofs;
 108         u32             iv_ofs;
 109         u32             ctrl_ofs;
 110         u32             data_ofs;
 111         u32             rev_ofs;
 112         u32             mask_ofs;
 113         u32             irq_enable_ofs;
 114         u32             irq_status_ofs;
 115
 116         u32             dma_enable_in;
 117         u32             dma_enable_out;
 118         u32             dma_start;
 119
 120         u32             major_mask;
 121         u32             major_shift;
 122         u32             minor_mask;
 123         u32             minor_shift;
 124 };
 125
 126 struct omap_des_dev {
 127         struct list_head        list;
 128         unsigned long           phys_base;
 129         void __iomem            *io_base;
 130         struct omap_des_ctx     *ctx;
 131         struct device           *dev;
 132         unsigned long           flags;
 133         int                     err;
 134
 135         /* spinlock used for queues */
 136         spinlock_t              lock;
 137         struct crypto_queue     queue;
 138
 139         struct tasklet_struct   done_task;
 140         struct tasklet_struct   queue_task;
 141
 142         struct ablkcipher_request       *req;
 143         /*
 144          * total is used by PIO mode for book keeping so introduce
 145          * variable total_save as need it to calc page_order
 146          */
 147         size_t                          total;
 148         size_t                          total_save;
 149
 150         struct scatterlist              *in_sg;
 151         struct scatterlist              *out_sg;
 152
 153         /* Buffers for copying for unaligned cases */
 154         struct scatterlist              in_sgl;
 155         struct scatterlist              out_sgl;
 156         struct scatterlist              *orig_out;
 157         int                             sgs_copied;
 158
 159         struct scatter_walk             in_walk;
 160         struct scatter_walk             out_walk;
 161         int                     dma_in;
 162         struct dma_chan         *dma_lch_in;
 163         int                     dma_out;
 164         struct dma_chan         *dma_lch_out;
 165         int                     in_sg_len;
 166         int                     out_sg_len;
 167         int                     pio_only;
 168         const struct omap_des_pdata     *pdata;
 169 };
 170
 171 /* keep registered devices data here */
 172 static LIST_HEAD(dev_list);
 173 static DEFINE_SPINLOCK(list_lock);
 174
 175 #ifdef DEBUG
 176 #define omap_des_read(dd, offset)                               \
 177         ({                                                              \
 178          int _read_ret;                                          \
 179          _read_ret = __raw_readl(dd->io_base + offset);          \
 180          pr_err("omap_des_read(" #offset "=%#x)= %#x\n",       \
 181                  offset, _read_ret);                            \
 182          _read_ret;                                              \
 183          })
 184 #else
 185 static inline u32 omap_des_read(struct omap_des_dev *dd, u32 offset)
 186 {
 187         return __raw_readl(dd->io_base + offset);
 188 }
 189 #endif
 190
 191 #ifdef DEBUG
 192 #define omap_des_write(dd, offset, value)                               \
 193         do {                                                            \
 194                 pr_err("omap_des_write(" #offset "=%#x) value=%#x\n", \
 195                                 offset, value);                                \
 196                 __raw_writel(value, dd->io_base + offset);              \
 197         } while (0)
 198 #else
 199 static inline void omap_des_write(struct omap_des_dev *dd, u32 offset,
 200                 u32 value)
 201 {
 202         __raw_writel(value, dd->io_base + offset);
 203 }
 204 #endif
 205
 206 static inline void omap_des_write_mask(struct omap_des_dev *dd, u32 offset,
 207                                         u32 value, u32 mask)
 208 {
 209         u32 val;
 210
 211         val = omap_des_read(dd, offset);
 212         val &= ~mask;
 213         val |= value;
 214         omap_des_write(dd, offset, val);
 215 }
 216
 217 static void omap_des_write_n(struct omap_des_dev *dd, u32 offset,
 218                                         u32 *value, int count)
 219 {
 220         for (; count--; value++, offset += 4)
 221                 omap_des_write(dd, offset, *value);
 222 }
 223
 224 static int omap_des_hw_init(struct omap_des_dev *dd)
 225 {
 226         int err;
 227
 228         /*
 229          * clocks are enabled when request starts and disabled when finished.
 230          * It may be long delays between requests.
 231          * Device might go to off mode to save power.
 232          */
 233         err = pm_runtime_get_sync(dd->dev);
 234         if (err < 0) {
 235                 pm_runtime_put_noidle(dd->dev);
 236                 dev_err(dd->dev, "%s: failed to get_sync(%d)\n", __func__, err);
 237                 return err;
 238         }
 239
 240         if (!(dd->flags & FLAGS_INIT)) {
 241                 dd->flags |= FLAGS_INIT;
 242                 dd->err = 0;
 243         }
 244
 245         return 0;
 246 }
 247
 248 static int omap_des_write_ctrl(struct omap_des_dev *dd)
 249 {
 250         unsigned int key32;
 251         int i, err;
 252         u32 val = 0, mask = 0;
 253
 254         err = omap_des_hw_init(dd);
 255         if (err)
 256                 return err;
 257
 258         key32 = dd->ctx->keylen / sizeof(u32);
 259
 260         /* it seems a key should always be set even if it has not changed */
 261         for (i = 0; i < key32; i++) {
 262                 omap_des_write(dd, DES_REG_KEY(dd, i),
 263                                __le32_to_cpu(dd->ctx->key[i]));
 264         }
 265
 266         if ((dd->flags & FLAGS_CBC) && dd->req->info)
 267                 omap_des_write_n(dd, DES_REG_IV(dd, 0), dd->req->info, 2);
 268
 269         if (dd->flags & FLAGS_CBC)
 270                 val |= DES_REG_CTRL_CBC;
 271         if (dd->flags & FLAGS_ENCRYPT)
 272                 val |= DES_REG_CTRL_DIRECTION;
 273         if (key32 == 6)
 274                 val |= DES_REG_CTRL_TDES;
 275
 276         mask |= DES_REG_CTRL_CBC | DES_REG_CTRL_DIRECTION | DES_REG_CTRL_TDES;
 277
 278         omap_des_write_mask(dd, DES_REG_CTRL(dd), val, mask);
 279
 280         return 0;
 281 }
 282
 283 static void omap_des_dma_trigger_omap4(struct omap_des_dev *dd, int length)
 284 {
 285         u32 mask, val;
 286
 287         omap_des_write(dd, DES_REG_LENGTH_N(0), length);
 288
 289         val = dd->pdata->dma_start;
 290
 291         if (dd->dma_lch_out != NULL)
 292                 val |= dd->pdata->dma_enable_out;
 293         if (dd->dma_lch_in != NULL)
 294                 val |= dd->pdata->dma_enable_in;
 295
 296         mask = dd->pdata->dma_enable_out | dd->pdata->dma_enable_in |
 297                dd->pdata->dma_start;
 298
 299         omap_des_write_mask(dd, DES_REG_MASK(dd), val, mask);
 300 }
 301
 302 static void omap_des_dma_stop(struct omap_des_dev *dd)
 303 {
 304         u32 mask;
 305
 306         mask = dd->pdata->dma_enable_out | dd->pdata->dma_enable_in |
 307                dd->pdata->dma_start;
 308
 309         omap_des_write_mask(dd, DES_REG_MASK(dd), 0, mask);
 310 }
 311
 312 static struct omap_des_dev *omap_des_find_dev(struct omap_des_ctx *ctx)
 313 {
 314         struct omap_des_dev *dd = NULL, *tmp;
 315
 316         spin_lock_bh(&list_lock);
 317         if (!ctx->dd) {
 318                 list_for_each_entry(tmp, &dev_list, list) {
 319                         /* FIXME: take fist available des core */
 320                         dd = tmp;
 321                         break;
 322                 }
 323                 ctx->dd = dd;
 324         } else {
 325                 /* already found before */
 326                 dd = ctx->dd;
 327         }
 328         spin_unlock_bh(&list_lock);
 329
 330         return dd;
 331 }
 332
 333 static void omap_des_dma_out_callback(void *data)
 334 {
 335         struct omap_des_dev *dd = data;
 336
 337         /* dma_lch_out - completed */
 338         tasklet_schedule(&dd->done_task);
 339 }
 340
 341 static int omap_des_dma_init(struct omap_des_dev *dd)
 342 {
 343         int err = -ENOMEM;
 344         dma_cap_mask_t mask;
 345
 346         dd->dma_lch_out = NULL;
 347         dd->dma_lch_in = NULL;
 348
 349         dma_cap_zero(mask);
 350         dma_cap_set(DMA_SLAVE, mask);
 351
 352         dd->dma_lch_in = dma_request_slave_channel_compat(mask,
 353                                                           omap_dma_filter_fn,
 354                                                           &dd->dma_in,
 355                                                           dd->dev, "rx");
 356         if (!dd->dma_lch_in) {
 357                 dev_err(dd->dev, "Unable to request in DMA channel\n");
 358                 goto err_dma_in;
 359         }
 360
 361         dd->dma_lch_out = dma_request_slave_channel_compat(mask,
 362                                                            omap_dma_filter_fn,
 363                                                            &dd->dma_out,
 364                                                            dd->dev, "tx");
 365         if (!dd->dma_lch_out) {
 366                 dev_err(dd->dev, "Unable to request out DMA channel\n");
 367                 goto err_dma_out;
 368         }
 369
 370         return 0;
 371
 372 err_dma_out:
 373         dma_release_channel(dd->dma_lch_in);
 374 err_dma_in:
 375         if (err)
 376                 pr_err("error: %d\n", err);
 377         return err;
 378 }
 379
 380 static void omap_des_dma_cleanup(struct omap_des_dev *dd)
 381 {
 382         dma_release_channel(dd->dma_lch_out);
 383         dma_release_channel(dd->dma_lch_in);
 384 }
 385
 386 static void sg_copy_buf(void *buf, struct scatterlist *sg,
 387                               unsigned int start, unsigned int nbytes, int out)
 388 {
 389         struct scatter_walk walk;
 390
 391         if (!nbytes)
 392                 return;
 393
 394         scatterwalk_start(&walk, sg);
 395         scatterwalk_advance(&walk, start);
 396         scatterwalk_copychunks(buf, &walk, nbytes, out);
 397         scatterwalk_done(&walk, out, 0);
 398 }
 399
 400 static int omap_des_crypt_dma(struct crypto_tfm *tfm,
 401                 struct scatterlist *in_sg, struct scatterlist *out_sg,
 402                 int in_sg_len, int out_sg_len)
 403 {
 404         struct omap_des_ctx *ctx = crypto_tfm_ctx(tfm);
 405         struct omap_des_dev *dd = ctx->dd;
 406         struct dma_async_tx_descriptor *tx_in, *tx_out;
 407         struct dma_slave_config cfg;
 408         int ret;
 409
 410         if (dd->pio_only) {
 411                 scatterwalk_start(&dd->in_walk, dd->in_sg);
 412                 scatterwalk_start(&dd->out_walk, dd->out_sg);
 413
 414                 /* Enable DATAIN interrupt and let it take
 415                    care of the rest */
 416                 omap_des_write(dd, DES_REG_IRQ_ENABLE(dd), 0x2);
 417                 return 0;
 418         }
 419
 420         dma_sync_sg_for_device(dd->dev, dd->in_sg, in_sg_len, DMA_TO_DEVICE);
 421
 422         memset(&cfg, 0, sizeof(cfg));
 423
 424         cfg.src_addr = dd->phys_base + DES_REG_DATA_N(dd, 0);
 425         cfg.dst_addr = dd->phys_base + DES_REG_DATA_N(dd, 0);
 426         cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 427         cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 428         cfg.src_maxburst = DST_MAXBURST;
 429         cfg.dst_maxburst = DST_MAXBURST;
 430
 431         /* IN */
 432         ret = dmaengine_slave_config(dd->dma_lch_in, &cfg);
 433         if (ret) {
 434                 dev_err(dd->dev, "can't configure IN dmaengine slave: %d\n",
 435                         ret);
 436                 return ret;
 437         }
 438
 439         tx_in = dmaengine_prep_slave_sg(dd->dma_lch_in, in_sg, in_sg_len,
 440                                         DMA_MEM_TO_DEV,
 441                                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 442         if (!tx_in) {
 443                 dev_err(dd->dev, "IN prep_slave_sg() failed\n");
 444                 return -EINVAL;
 445         }
 446
 447         /* No callback necessary */
 448         tx_in->callback_param = dd;
 449
 450         /* OUT */
 451         ret = dmaengine_slave_config(dd->dma_lch_out, &cfg);
 452         if (ret) {
 453                 dev_err(dd->dev, "can't configure OUT dmaengine slave: %d\n",
 454                         ret);
 455                 return ret;
 456         }
 457
 458         tx_out = dmaengine_prep_slave_sg(dd->dma_lch_out, out_sg, out_sg_len,
 459                                         DMA_DEV_TO_MEM,
 460                                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 461         if (!tx_out) {
 462                 dev_err(dd->dev, "OUT prep_slave_sg() failed\n");
 463                 return -EINVAL;
 464         }
 465
 466         tx_out->callback = omap_des_dma_out_callback;
 467         tx_out->callback_param = dd;
 468
 469         dmaengine_submit(tx_in);
 470         dmaengine_submit(tx_out);
 471
 472         dma_async_issue_pending(dd->dma_lch_in);
 473         dma_async_issue_pending(dd->dma_lch_out);
 474
 475         /* start DMA */
 476         dd->pdata->trigger(dd, dd->total);
 477
 478         return 0;
 479 }
 480
 481 static int omap_des_crypt_dma_start(struct omap_des_dev *dd)
 482 {
 483         struct crypto_tfm *tfm = crypto_ablkcipher_tfm(
 484                                         crypto_ablkcipher_reqtfm(dd->req));
 485         int err;
 486
 487         pr_debug("total: %d\n", dd->total);
 488
 489         if (!dd->pio_only) {
 490                 err = dma_map_sg(dd->dev, dd->in_sg, dd->in_sg_len,
 491                                  DMA_TO_DEVICE);
 492                 if (!err) {
 493                         dev_err(dd->dev, "dma_map_sg() error\n");
 494                         return -EINVAL;
 495                 }
 496
 497                 err = dma_map_sg(dd->dev, dd->out_sg, dd->out_sg_len,
 498                                  DMA_FROM_DEVICE);
 499                 if (!err) {
 500                         dev_err(dd->dev, "dma_map_sg() error\n");
 501                         return -EINVAL;
 502                 }
 503         }
 504
 505         err = omap_des_crypt_dma(tfm, dd->in_sg, dd->out_sg, dd->in_sg_len,
 506                                  dd->out_sg_len);
 507         if (err && !dd->pio_only) {
 508                 dma_unmap_sg(dd->dev, dd->in_sg, dd->in_sg_len, DMA_TO_DEVICE);
 509                 dma_unmap_sg(dd->dev, dd->out_sg, dd->out_sg_len,
 510                              DMA_FROM_DEVICE);
 511         }
 512
 513         return err;
 514 }
 515
 516 static void omap_des_finish_req(struct omap_des_dev *dd, int err)
 517 {
 518         struct ablkcipher_request *req = dd->req;
 519
 520         pr_debug("err: %d\n", err);
 521
 522         pm_runtime_put(dd->dev);
 523         dd->flags &= ~FLAGS_BUSY;
 524
 525         req->base.complete(&req->base, err);
 526 }
 527
 528 static int omap_des_crypt_dma_stop(struct omap_des_dev *dd)
 529 {
 530         int err = 0;
 531
 532         pr_debug("total: %d\n", dd->total);
 533
 534         omap_des_dma_stop(dd);
 535
 536         dmaengine_terminate_all(dd->dma_lch_in);
 537         dmaengine_terminate_all(dd->dma_lch_out);
 538
 539         return err;
 540 }
 541
 542 static int omap_des_copy_needed(struct scatterlist *sg)
 543 {
 544         while (sg) {
 545                 if (!IS_ALIGNED(sg->offset, 4))
 546                         return -1;
 547                 if (!IS_ALIGNED(sg->length, DES_BLOCK_SIZE))
 548                         return -1;
 549                 sg = sg_next(sg);
 550         }
 551         return 0;
 552 }
 553
 554 static int omap_des_copy_sgs(struct omap_des_dev *dd)
 555 {
 556         void *buf_in, *buf_out;
 557         int pages;
 558
 559         pages = dd->total >> PAGE_SHIFT;
 560
 561         if (dd->total & (PAGE_SIZE-1))
 562                 pages++;
 563
 564         BUG_ON(!pages);
 565
 566         buf_in = (void *)__get_free_pages(GFP_ATOMIC, pages);
 567         buf_out = (void *)__get_free_pages(GFP_ATOMIC, pages);
 568
 569         if (!buf_in || !buf_out) {
 570                 pr_err("Couldn't allocated pages for unaligned cases.\n");
 571                 return -1;
 572         }
 573
 574         dd->orig_out = dd->out_sg;
 575
 576         sg_copy_buf(buf_in, dd->in_sg, 0, dd->total, 0);
 577
 578         sg_init_table(&dd->in_sgl, 1);
 579         sg_set_buf(&dd->in_sgl, buf_in, dd->total);
 580         dd->in_sg = &dd->in_sgl;
 581
 582         sg_init_table(&dd->out_sgl, 1);
 583         sg_set_buf(&dd->out_sgl, buf_out, dd->total);
 584         dd->out_sg = &dd->out_sgl;
 585
 586         return 0;
 587 }
 588
 589 static int omap_des_handle_queue(struct omap_des_dev *dd,
 590                                struct ablkcipher_request *req)
 591 {
 592         struct crypto_async_request *async_req, *backlog;
 593         struct omap_des_ctx *ctx;
 594         struct omap_des_reqctx *rctx;
 595         unsigned long flags;
 596         int err, ret = 0;
 597
 598         spin_lock_irqsave(&dd->lock, flags);
 599         if (req)
 600                 ret = ablkcipher_enqueue_request(&dd->queue, req);
 601         if (dd->flags & FLAGS_BUSY) {
 602                 spin_unlock_irqrestore(&dd->lock, flags);
 603                 return ret;
 604         }
 605         backlog = crypto_get_backlog(&dd->queue);
 606         async_req = crypto_dequeue_request(&dd->queue);
 607         if (async_req)
 608                 dd->flags |= FLAGS_BUSY;
 609         spin_unlock_irqrestore(&dd->lock, flags);
 610
 611         if (!async_req)
 612                 return ret;
 613
 614         if (backlog)
 615                 backlog->complete(backlog, -EINPROGRESS);
 616
 617         req = ablkcipher_request_cast(async_req);
 618
 619         /* assign new request to device */
 620         dd->req = req;
 621         dd->total = req->nbytes;
 622         dd->total_save = req->nbytes;
 623         dd->in_sg = req->src;
 624         dd->out_sg = req->dst;
 625
 626         if (omap_des_copy_needed(dd->in_sg) ||
 627             omap_des_copy_needed(dd->out_sg)) {
 628                 if (omap_des_copy_sgs(dd))
 629                         pr_err("Failed to copy SGs for unaligned cases\n");
 630                 dd->sgs_copied = 1;
 631         } else {
 632                 dd->sgs_copied = 0;
 633         }
 634
 635         dd->in_sg_len = scatterwalk_bytes_sglen(dd->in_sg, dd->total);
 636         dd->out_sg_len = scatterwalk_bytes_sglen(dd->out_sg, dd->total);
 637         BUG_ON(dd->in_sg_len < 0 || dd->out_sg_len < 0);
 638
 639         rctx = ablkcipher_request_ctx(req);
 640         ctx = crypto_ablkcipher_ctx(crypto_ablkcipher_reqtfm(req));
 641         rctx->mode &= FLAGS_MODE_MASK;
 642         dd->flags = (dd->flags & ~FLAGS_MODE_MASK) | rctx->mode;
 643
 644         dd->ctx = ctx;
 645         ctx->dd = dd;
 646
 647         err = omap_des_write_ctrl(dd);
 648         if (!err)
 649                 err = omap_des_crypt_dma_start(dd);
 650         if (err) {
 651                 /* des_task will not finish it, so do it here */
 652                 omap_des_finish_req(dd, err);
 653                 tasklet_schedule(&dd->queue_task);
 654         }
 655
 656         return ret; /* return ret, which is enqueue return value */
 657 }
 658
 659 static void omap_des_done_task(unsigned long data)
 660 {
 661         struct omap_des_dev *dd = (struct omap_des_dev *)data;
 662         void *buf_in, *buf_out;
 663         int pages;
 664
 665         pr_debug("enter done_task\n");
 666
 667         if (!dd->pio_only) {
 668                 dma_sync_sg_for_device(dd->dev, dd->out_sg, dd->out_sg_len,
 669                                        DMA_FROM_DEVICE);
 670                 dma_unmap_sg(dd->dev, dd->in_sg, dd->in_sg_len, DMA_TO_DEVICE);
 671                 dma_unmap_sg(dd->dev, dd->out_sg, dd->out_sg_len,
 672                              DMA_FROM_DEVICE);
 673                 omap_des_crypt_dma_stop(dd);
 674         }
 675
 676         if (dd->sgs_copied) {
 677                 buf_in = sg_virt(&dd->in_sgl);
 678                 buf_out = sg_virt(&dd->out_sgl);
 679
 680                 sg_copy_buf(buf_out, dd->orig_out, 0, dd->total_save, 1);
 681
 682                 pages = get_order(dd->total_save);
 683                 free_pages((unsigned long)buf_in, pages);
 684                 free_pages((unsigned long)buf_out, pages);
 685         }
 686
 687         omap_des_finish_req(dd, 0);
 688         omap_des_handle_queue(dd, NULL);
 689
 690         pr_debug("exit\n");
 691 }
 692
 693 static void omap_des_queue_task(unsigned long data)
 694 {
 695         struct omap_des_dev *dd = (struct omap_des_dev *)data;
 696
 697         omap_des_handle_queue(dd, NULL);
 698 }
 699
 700 static int omap_des_crypt(struct ablkcipher_request *req, unsigned long mode)
 701 {
 702         struct omap_des_ctx *ctx = crypto_ablkcipher_ctx(
 703                         crypto_ablkcipher_reqtfm(req));
 704         struct omap_des_reqctx *rctx = ablkcipher_request_ctx(req);
 705         struct omap_des_dev *dd;
 706
 707         pr_debug("nbytes: %d, enc: %d, cbc: %d\n", req->nbytes,
 708                  !!(mode & FLAGS_ENCRYPT),
 709                  !!(mode & FLAGS_CBC));
 710
 711         if (!IS_ALIGNED(req->nbytes, DES_BLOCK_SIZE)) {
 712                 pr_err("request size is not exact amount of DES blocks\n");
 713                 return -EINVAL;
 714         }
 715
 716         dd = omap_des_find_dev(ctx);
 717         if (!dd)
 718                 return -ENODEV;
 719
 720         rctx->mode = mode;
 721
 722         return omap_des_handle_queue(dd, req);
 723 }
 724
 725 /* ********************** ALG API ************************************ */
 726
 727 static int omap_des_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
 728                            unsigned int keylen)
 729 {
 730         struct omap_des_ctx *ctx = crypto_ablkcipher_ctx(tfm);
 731
 732         if (keylen != DES_KEY_SIZE && keylen != (3*DES_KEY_SIZE))
 733                 return -EINVAL;
 734
 735         pr_debug("enter, keylen: %d\n", keylen);
 736
 737         memcpy(ctx->key, key, keylen);
 738         ctx->keylen = keylen;
 739
 740         return 0;
 741 }
 742
 743 static int omap_des_ecb_encrypt(struct ablkcipher_request *req)
 744 {
 745         return omap_des_crypt(req, FLAGS_ENCRYPT);
 746 }
 747
 748 static int omap_des_ecb_decrypt(struct ablkcipher_request *req)
 749 {
 750         return omap_des_crypt(req, 0);
 751 }
 752
 753 static int omap_des_cbc_encrypt(struct ablkcipher_request *req)
 754 {
 755         return omap_des_crypt(req, FLAGS_ENCRYPT | FLAGS_CBC);
 756 }
 757
 758 static int omap_des_cbc_decrypt(struct ablkcipher_request *req)
 759 {
 760         return omap_des_crypt(req, FLAGS_CBC);
 761 }
 762
 763 static int omap_des_cra_init(struct crypto_tfm *tfm)
 764 {
 765         pr_debug("enter\n");
 766
 767         tfm->crt_ablkcipher.reqsize = sizeof(struct omap_des_reqctx);
 768
 769         return 0;
 770 }
 771
 772 static void omap_des_cra_exit(struct crypto_tfm *tfm)
 773 {
 774         pr_debug("enter\n");
 775 }
 776
 777 /* ********************** ALGS ************************************ */
 778
 779 static struct crypto_alg algs_ecb_cbc[] = {
 780 {
 781         .cra_name               = "ecb(des)",
 782         .cra_driver_name        = "ecb-des-omap",
 783         .cra_priority           = 100,
 784         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER |
 785                                   CRYPTO_ALG_KERN_DRIVER_ONLY |
 786                                   CRYPTO_ALG_ASYNC,
 787         .cra_blocksize          = DES_BLOCK_SIZE,
 788         .cra_ctxsize            = sizeof(struct omap_des_ctx),
 789         .cra_alignmask          = 0,
 790         .cra_type               = &crypto_ablkcipher_type,
 791         .cra_module             = THIS_MODULE,
 792         .cra_init               = omap_des_cra_init,
 793         .cra_exit               = omap_des_cra_exit,
 794         .cra_u.ablkcipher = {
 795                 .min_keysize    = DES_KEY_SIZE,
 796                 .max_keysize    = DES_KEY_SIZE,
 797                 .setkey         = omap_des_setkey,
 798                 .encrypt        = omap_des_ecb_encrypt,
 799                 .decrypt        = omap_des_ecb_decrypt,
 800         }
 801 },
 802 {
 803         .cra_name               = "cbc(des)",
 804         .cra_driver_name        = "cbc-des-omap",
 805         .cra_priority           = 100,
 806         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER |
 807                                   CRYPTO_ALG_KERN_DRIVER_ONLY |
 808                                   CRYPTO_ALG_ASYNC,
 809         .cra_blocksize          = DES_BLOCK_SIZE,
 810         .cra_ctxsize            = sizeof(struct omap_des_ctx),
 811         .cra_alignmask          = 0,
 812         .cra_type               = &crypto_ablkcipher_type,
 813         .cra_module             = THIS_MODULE,
 814         .cra_init               = omap_des_cra_init,
 815         .cra_exit               = omap_des_cra_exit,
 816         .cra_u.ablkcipher = {
 817                 .min_keysize    = DES_KEY_SIZE,
 818                 .max_keysize    = DES_KEY_SIZE,
 819                 .ivsize         = DES_BLOCK_SIZE,
 820                 .setkey         = omap_des_setkey,
 821                 .encrypt        = omap_des_cbc_encrypt,
 822                 .decrypt        = omap_des_cbc_decrypt,
 823         }
 824 },
 825 {
 826         .cra_name               = "ecb(des3_ede)",
 827         .cra_driver_name        = "ecb-des3-omap",
 828         .cra_priority           = 100,
 829         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER |
 830                                   CRYPTO_ALG_KERN_DRIVER_ONLY |
 831                                   CRYPTO_ALG_ASYNC,
 832         .cra_blocksize          = DES_BLOCK_SIZE,
 833         .cra_ctxsize            = sizeof(struct omap_des_ctx),
 834         .cra_alignmask          = 0,
 835         .cra_type               = &crypto_ablkcipher_type,
 836         .cra_module             = THIS_MODULE,
 837         .cra_init               = omap_des_cra_init,
 838         .cra_exit               = omap_des_cra_exit,
 839         .cra_u.ablkcipher = {
 840                 .min_keysize    = 3*DES_KEY_SIZE,
 841                 .max_keysize    = 3*DES_KEY_SIZE,
 842                 .setkey         = omap_des_setkey,
 843                 .encrypt        = omap_des_ecb_encrypt,
 844                 .decrypt        = omap_des_ecb_decrypt,
 845         }
 846 },
 847 {
 848         .cra_name               = "cbc(des3_ede)",
 849         .cra_driver_name        = "cbc-des3-omap",
 850         .cra_priority           = 100,
 851         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER |
 852                                   CRYPTO_ALG_KERN_DRIVER_ONLY |
 853                                   CRYPTO_ALG_ASYNC,
 854         .cra_blocksize          = DES_BLOCK_SIZE,
 855         .cra_ctxsize            = sizeof(struct omap_des_ctx),
 856         .cra_alignmask          = 0,
 857         .cra_type               = &crypto_ablkcipher_type,
 858         .cra_module             = THIS_MODULE,
 859         .cra_init               = omap_des_cra_init,
 860         .cra_exit               = omap_des_cra_exit,
 861         .cra_u.ablkcipher = {
 862                 .min_keysize    = 3*DES_KEY_SIZE,
 863                 .max_keysize    = 3*DES_KEY_SIZE,
 864                 .ivsize         = DES_BLOCK_SIZE,
 865                 .setkey         = omap_des_setkey,
 866                 .encrypt        = omap_des_cbc_encrypt,
 867                 .decrypt        = omap_des_cbc_decrypt,
 868         }
 869 }
 870 };
 871
 872 static struct omap_des_algs_info omap_des_algs_info_ecb_cbc[] = {
 873         {
 874                 .algs_list      = algs_ecb_cbc,
 875                 .size           = ARRAY_SIZE(algs_ecb_cbc),
 876         },
 877 };
 878
 879 #ifdef CONFIG_OF
 880 static const struct omap_des_pdata omap_des_pdata_omap4 = {
 881         .algs_info      = omap_des_algs_info_ecb_cbc,
 882         .algs_info_size = ARRAY_SIZE(omap_des_algs_info_ecb_cbc),
 883         .trigger        = omap_des_dma_trigger_omap4,
 884         .key_ofs        = 0x14,
 885         .iv_ofs         = 0x18,
 886         .ctrl_ofs       = 0x20,
 887         .data_ofs       = 0x28,
 888         .rev_ofs        = 0x30,
 889         .mask_ofs       = 0x34,
 890         .irq_status_ofs = 0x3c,
 891         .irq_enable_ofs = 0x40,
 892         .dma_enable_in  = BIT(5),
 893         .dma_enable_out = BIT(6),
 894         .major_mask     = 0x0700,
 895         .major_shift    = 8,
 896         .minor_mask     = 0x003f,
 897         .minor_shift    = 0,
 898 };
 899
 900 static irqreturn_t omap_des_irq(int irq, void *dev_id)
 901 {
 902         struct omap_des_dev *dd = dev_id;
 903         u32 status, i;
 904         u32 *src, *dst;
 905
 906         status = omap_des_read(dd, DES_REG_IRQ_STATUS(dd));
 907         if (status & DES_REG_IRQ_DATA_IN) {
 908                 omap_des_write(dd, DES_REG_IRQ_ENABLE(dd), 0x0);
 909
 910                 BUG_ON(!dd->in_sg);
 911
 912                 BUG_ON(_calc_walked(in) > dd->in_sg->length);
 913
 914                 src = sg_virt(dd->in_sg) + _calc_walked(in);
 915
 916                 for (i = 0; i < DES_BLOCK_WORDS; i++) {
 917                         omap_des_write(dd, DES_REG_DATA_N(dd, i), *src);
 918
 919                         scatterwalk_advance(&dd->in_walk, 4);
 920                         if (dd->in_sg->length == _calc_walked(in)) {
 921                                 dd->in_sg = sg_next(dd->in_sg);
 922                                 if (dd->in_sg) {
 923                                         scatterwalk_start(&dd->in_walk,
 924                                                           dd->in_sg);
 925                                         src = sg_virt(dd->in_sg) +
 926                                               _calc_walked(in);
 927                                 }
 928                         } else {
 929                                 src++;
 930                         }
 931                 }
 932
 933                 /* Clear IRQ status */
 934                 status &= ~DES_REG_IRQ_DATA_IN;
 935                 omap_des_write(dd, DES_REG_IRQ_STATUS(dd), status);
 936
 937                 /* Enable DATA_OUT interrupt */
 938                 omap_des_write(dd, DES_REG_IRQ_ENABLE(dd), 0x4);
 939
 940         } else if (status & DES_REG_IRQ_DATA_OUT) {
 941                 omap_des_write(dd, DES_REG_IRQ_ENABLE(dd), 0x0);
 942
 943                 BUG_ON(!dd->out_sg);
 944
 945                 BUG_ON(_calc_walked(out) > dd->out_sg->length);
 946
 947                 dst = sg_virt(dd->out_sg) + _calc_walked(out);
 948
 949                 for (i = 0; i < DES_BLOCK_WORDS; i++) {
 950                         *dst = omap_des_read(dd, DES_REG_DATA_N(dd, i));
 951                         scatterwalk_advance(&dd->out_walk, 4);
 952                         if (dd->out_sg->length == _calc_walked(out)) {
 953                                 dd->out_sg = sg_next(dd->out_sg);
 954                                 if (dd->out_sg) {
 955                                         scatterwalk_start(&dd->out_walk,
 956                                                           dd->out_sg);
 957                                         dst = sg_virt(dd->out_sg) +
 958                                               _calc_walked(out);
 959                                 }
 960                         } else {
 961                                 dst++;
 962                         }
 963                 }
 964
 965                 BUG_ON(dd->total < DES_BLOCK_SIZE);
 966
 967                 dd->total -= DES_BLOCK_SIZE;
 968
 969                 /* Clear IRQ status */
 970                 status &= ~DES_REG_IRQ_DATA_OUT;
 971                 omap_des_write(dd, DES_REG_IRQ_STATUS(dd), status);
 972
 973                 if (!dd->total)
 974                         /* All bytes read! */
 975                         tasklet_schedule(&dd->done_task);
 976                 else
 977                         /* Enable DATA_IN interrupt for next block */
 978                         omap_des_write(dd, DES_REG_IRQ_ENABLE(dd), 0x2);
 979         }
 980
 981         return IRQ_HANDLED;
 982 }
 983
 984 static const struct of_device_id omap_des_of_match[] = {
 985         {
 986                 .compatible     = "ti,omap4-des",
 987                 .data           = &omap_des_pdata_omap4,
 988         },
 989         {},
 990 };
 991 MODULE_DEVICE_TABLE(of, omap_des_of_match);
 992
 993 static int omap_des_get_of(struct omap_des_dev *dd,
 994                 struct platform_device *pdev)
 995 {
 996         const struct of_device_id *match;
 997
 998         match = of_match_device(of_match_ptr(omap_des_of_match), &pdev->dev);
 999         if (!match) {
1000                 dev_err(&pdev->dev, "no compatible OF match\n");
1001                 return -EINVAL;
1002         }
1003
1004         dd->dma_out = -1; /* Dummy value that's unused */
1005         dd->dma_in = -1; /* Dummy value that's unused */
1006         dd->pdata = match->data;
1007
1008         return 0;
1009 }
1010 #else
1011 static int omap_des_get_of(struct omap_des_dev *dd,
1012                 struct device *dev)
1013 {
1014         return -EINVAL;
1015 }
1016 #endif
1017
1018 static int omap_des_get_pdev(struct omap_des_dev *dd,
1019                 struct platform_device *pdev)
1020 {
1021         struct device *dev = &pdev->dev;
1022         struct resource *r;
1023         int err = 0;
1024
1025         /* Get the DMA out channel */
1026         r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
1027         if (!r) {
1028                 dev_err(dev, "no DMA out resource info\n");
1029                 err = -ENODEV;
1030                 goto err;
1031         }
1032         dd->dma_out = r->start;
1033
1034         /* Get the DMA in channel */
1035         r = platform_get_resource(pdev, IORESOURCE_DMA, 1);
1036         if (!r) {
1037                 dev_err(dev, "no DMA in resource info\n");
1038                 err = -ENODEV;
1039                 goto err;
1040         }
1041         dd->dma_in = r->start;
1042
1043         /* non-DT devices get pdata from pdev */
1044         dd->pdata = pdev->dev.platform_data;
1045
1046 err:
1047         return err;
1048 }
1049
1050 static int omap_des_probe(struct platform_device *pdev)
1051 {
1052         struct device *dev = &pdev->dev;
1053         struct omap_des_dev *dd;
1054         struct crypto_alg *algp;
1055         struct resource *res;
1056         int err = -ENOMEM, i, j, irq = -1;
1057         u32 reg;
1058
1059         dd = devm_kzalloc(dev, sizeof(struct omap_des_dev), GFP_KERNEL);
1060         if (dd == NULL) {
1061                 dev_err(dev, "unable to alloc data struct.\n");
1062                 goto err_data;
1063         }
1064         dd->dev = dev;
1065         platform_set_drvdata(pdev, dd);
1066
1067         spin_lock_init(&dd->lock);
1068         crypto_init_queue(&dd->queue, OMAP_DES_QUEUE_LENGTH);
1069
1070         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1071         if (!res) {
1072                 dev_err(dev, "no MEM resource info\n");
1073                 goto err_res;
1074         }
1075
1076         err = (dev->of_node) ? omap_des_get_of(dd, pdev) :
1077                                omap_des_get_pdev(dd, pdev);
1078         if (err)
1079                 goto err_res;
1080
1081         dd->io_base = devm_ioremap_resource(dev, res);
1082         if (IS_ERR(dd->io_base)) {
1083                 err = PTR_ERR(dd->io_base);
1084                 goto err_res;
1085         }
1086         dd->phys_base = res->start;
1087
1088         pm_runtime_enable(dev);
1089         err = pm_runtime_get_sync(dev);
1090         if (err < 0) {
1091                 pm_runtime_put_noidle(dev);
1092                 dev_err(dd->dev, "%s: failed to get_sync(%d)\n", __func__, err);
1093                 goto err_get;
1094         }
1095
1096         omap_des_dma_stop(dd);
1097
1098         reg = omap_des_read(dd, DES_REG_REV(dd));
1099
1100         pm_runtime_put_sync(dev);
1101
1102         dev_info(dev, "OMAP DES hw accel rev: %u.%u\n",
1103                  (reg & dd->pdata->major_mask) >> dd->pdata->major_shift,
1104                  (reg & dd->pdata->minor_mask) >> dd->pdata->minor_shift);
1105
1106         tasklet_init(&dd->done_task, omap_des_done_task, (unsigned long)dd);
1107         tasklet_init(&dd->queue_task, omap_des_queue_task, (unsigned long)dd);
1108
1109         err = omap_des_dma_init(dd);
1110         if (err && DES_REG_IRQ_STATUS(dd) && DES_REG_IRQ_ENABLE(dd)) {
1111                 dd->pio_only = 1;
1112
1113                 irq = platform_get_irq(pdev, 0);
1114                 if (irq < 0) {
1115                         dev_err(dev, "can't get IRQ resource\n");
1116                         goto err_irq;
1117                 }
1118
1119                 err = devm_request_irq(dev, irq, omap_des_irq, 0,
1120                                 dev_name(dev), dd);
1121                 if (err) {
1122                         dev_err(dev, "Unable to grab omap-des IRQ\n");
1123                         goto err_irq;
1124                 }
1125         }
1126
1127
1128         INIT_LIST_HEAD(&dd->list);
1129         spin_lock(&list_lock);
1130         list_add_tail(&dd->list, &dev_list);
1131         spin_unlock(&list_lock);
1132
1133         for (i = 0; i < dd->pdata->algs_info_size; i++) {
1134                 for (j = 0; j < dd->pdata->algs_info[i].size; j++) {
1135                         algp = &dd->pdata->algs_info[i].algs_list[j];
1136
1137                         pr_debug("reg alg: %s\n", algp->cra_name);
1138                         INIT_LIST_HEAD(&algp->cra_list);
1139
1140                         err = crypto_register_alg(algp);
1141                         if (err)
1142                                 goto err_algs;
1143
1144                         dd->pdata->algs_info[i].registered++;
1145                 }
1146         }
1147
1148         return 0;
1149 err_algs:
1150         for (i = dd->pdata->algs_info_size - 1; i >= 0; i--)
1151                 for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--)
1152                         crypto_unregister_alg(
1153                                         &dd->pdata->algs_info[i].algs_list[j]);
1154         if (!dd->pio_only)
1155                 omap_des_dma_cleanup(dd);
1156 err_irq:
1157         tasklet_kill(&dd->done_task);
1158         tasklet_kill(&dd->queue_task);
1159 err_get:
1160         pm_runtime_disable(dev);
1161 err_res:
1162         dd = NULL;
1163 err_data:
1164         dev_err(dev, "initialization failed.\n");
1165         return err;
1166 }
1167
1168 static int omap_des_remove(struct platform_device *pdev)
1169 {
1170         struct omap_des_dev *dd = platform_get_drvdata(pdev);
1171         int i, j;
1172
1173         if (!dd)
1174                 return -ENODEV;
1175
1176         spin_lock(&list_lock);
1177         list_del(&dd->list);
1178         spin_unlock(&list_lock);
1179
1180         for (i = dd->pdata->algs_info_size - 1; i >= 0; i--)
1181                 for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--)
1182                         crypto_unregister_alg(
1183                                         &dd->pdata->algs_info[i].algs_list[j]);
1184
1185         tasklet_kill(&dd->done_task);
1186         tasklet_kill(&dd->queue_task);
1187         omap_des_dma_cleanup(dd);
1188         pm_runtime_disable(dd->dev);
1189         dd = NULL;
1190
1191         return 0;
1192 }
1193
1194 #ifdef CONFIG_PM_SLEEP
1195 static int omap_des_suspend(struct device *dev)
1196 {
1197         pm_runtime_put_sync(dev);
1198         return 0;
1199 }
1200
1201 static int omap_des_resume(struct device *dev)
1202 {
1203         int err;
1204
1205         err = pm_runtime_get_sync(dev);
1206         if (err < 0) {
1207                 pm_runtime_put_noidle(dev);
1208                 dev_err(dev, "%s: failed to get_sync(%d)\n", __func__, err);
1209                 return err;
1210         }
1211         return 0;
1212 }
1213 #endif
1214
1215 static SIMPLE_DEV_PM_OPS(omap_des_pm_ops, omap_des_suspend, omap_des_resume);
1216
1217 static struct platform_driver omap_des_driver = {
1218         .probe  = omap_des_probe,
1219         .remove = omap_des_remove,
1220         .driver = {
1221                 .name   = "omap-des",
1222                 .pm     = &omap_des_pm_ops,
1223                 .of_match_table = of_match_ptr(omap_des_of_match),
1224         },
1225 };
1226
1227 module_platform_driver(omap_des_driver);
1228
1229 MODULE_DESCRIPTION("OMAP DES hw acceleration support.");
1230 MODULE_LICENSE("GPL v2");
1231 MODULE_AUTHOR("Joel Fernandes <[email protected]>");