drivers/crypto/omap-des.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Support for OMAP DES and Triple DES HW acceleration.
   4  *
   5  * Copyright (c) 2013 Texas Instruments Incorporated
   6  * Author: Joel Fernandes <joelf@ti.com>
   7  */
   8
   9 #define pr_fmt(fmt) "%s: " fmt, __func__
  10
  11 #ifdef DEBUG
  12 #define prn(num) printk(#num "=%d\n", num)
  13 #define prx(num) printk(#num "=%x\n", num)
  14 #else
  15 #define prn(num) do { } while (0)
  16 #define prx(num)  do { } while (0)
  17 #endif
  18
  19 #include <linux/err.h>
  20 #include <linux/module.h>
  21 #include <linux/init.h>
  22 #include <linux/errno.h>
  23 #include <linux/kernel.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/scatterlist.h>
  26 #include <linux/dma-mapping.h>
  27 #include <linux/dmaengine.h>
  28 #include <linux/pm_runtime.h>
  29 #include <linux/of.h>
  30 #include <linux/of_device.h>
  31 #include <linux/of_address.h>
  32 #include <linux/io.h>
  33 #include <linux/crypto.h>
  34 #include <linux/interrupt.h>
  35 #include <crypto/scatterwalk.h>
  36 #include <crypto/internal/des.h>
  37 #include <crypto/internal/skcipher.h>
  38 #include <crypto/algapi.h>
  39 #include <crypto/engine.h>
  40
  41 #include "omap-crypto.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 #define DEFAULT_AUTOSUSPEND_DELAY       1000
  81
  82 #define FLAGS_IN_DATA_ST_SHIFT  8
  83 #define FLAGS_OUT_DATA_ST_SHIFT 10
  84
  85 struct omap_des_ctx {
  86         struct crypto_engine_ctx enginectx;
  87         struct omap_des_dev *dd;
  88
  89         int             keylen;
  90         __le32          key[(3 * DES_KEY_SIZE) / sizeof(u32)];
  91         unsigned long   flags;
  92 };
  93
  94 struct omap_des_reqctx {
  95         unsigned long mode;
  96 };
  97
  98 #define OMAP_DES_QUEUE_LENGTH   1
  99 #define OMAP_DES_CACHE_SIZE     0
 100
 101 struct omap_des_algs_info {
 102         struct skcipher_alg     *algs_list;
 103         unsigned int            size;
 104         unsigned int            registered;
 105 };
 106
 107 struct omap_des_pdata {
 108         struct omap_des_algs_info       *algs_info;
 109         unsigned int    algs_info_size;
 110
 111         void            (*trigger)(struct omap_des_dev *dd, int length);
 112
 113         u32             key_ofs;
 114         u32             iv_ofs;
 115         u32             ctrl_ofs;
 116         u32             data_ofs;
 117         u32             rev_ofs;
 118         u32             mask_ofs;
 119         u32             irq_enable_ofs;
 120         u32             irq_status_ofs;
 121
 122         u32             dma_enable_in;
 123         u32             dma_enable_out;
 124         u32             dma_start;
 125
 126         u32             major_mask;
 127         u32             major_shift;
 128         u32             minor_mask;
 129         u32             minor_shift;
 130 };
 131
 132 struct omap_des_dev {
 133         struct list_head        list;
 134         unsigned long           phys_base;
 135         void __iomem            *io_base;
 136         struct omap_des_ctx     *ctx;
 137         struct device           *dev;
 138         unsigned long           flags;
 139         int                     err;
 140
 141         struct tasklet_struct   done_task;
 142
 143         struct skcipher_request *req;
 144         struct crypto_engine            *engine;
 145         /*
 146          * total is used by PIO mode for book keeping so introduce
 147          * variable total_save as need it to calc page_order
 148          */
 149         size_t                          total;
 150         size_t                          total_save;
 151
 152         struct scatterlist              *in_sg;
 153         struct scatterlist              *out_sg;
 154
 155         /* Buffers for copying for unaligned cases */
 156         struct scatterlist              in_sgl;
 157         struct scatterlist              out_sgl;
 158         struct scatterlist              *orig_out;
 159
 160         struct scatter_walk             in_walk;
 161         struct scatter_walk             out_walk;
 162         struct dma_chan         *dma_lch_in;
 163         struct dma_chan         *dma_lch_out;
 164         int                     in_sg_len;
 165         int                     out_sg_len;
 166         int                     pio_only;
 167         const struct omap_des_pdata     *pdata;
 168 };
 169
 170 /* keep registered devices data here */
 171 static LIST_HEAD(dev_list);
 172 static DEFINE_SPINLOCK(list_lock);
 173
 174 #ifdef DEBUG
 175 #define omap_des_read(dd, offset)                               \
 176         ({                                                              \
 177          int _read_ret;                                          \
 178          _read_ret = __raw_readl(dd->io_base + offset);          \
 179          pr_err("omap_des_read(" #offset "=%#x)= %#x\n",       \
 180                  offset, _read_ret);                            \
 181          _read_ret;                                              \
 182          })
 183 #else
 184 static inline u32 omap_des_read(struct omap_des_dev *dd, u32 offset)
 185 {
 186         return __raw_readl(dd->io_base + offset);
 187 }
 188 #endif
 189
 190 #ifdef DEBUG
 191 #define omap_des_write(dd, offset, value)                               \
 192         do {                                                            \
 193                 pr_err("omap_des_write(" #offset "=%#x) value=%#x\n", \
 194                                 offset, value);                                \
 195                 __raw_writel(value, dd->io_base + offset);              \
 196         } while (0)
 197 #else
 198 static inline void omap_des_write(struct omap_des_dev *dd, u32 offset,
 199                 u32 value)
 200 {
 201         __raw_writel(value, dd->io_base + offset);
 202 }
 203 #endif
 204
 205 static inline void omap_des_write_mask(struct omap_des_dev *dd, u32 offset,
 206                                         u32 value, u32 mask)
 207 {
 208         u32 val;
 209
 210         val = omap_des_read(dd, offset);
 211         val &= ~mask;
 212         val |= value;
 213         omap_des_write(dd, offset, val);
 214 }
 215
 216 static void omap_des_write_n(struct omap_des_dev *dd, u32 offset,
 217                                         u32 *value, int count)
 218 {
 219         for (; count--; value++, offset += 4)
 220                 omap_des_write(dd, offset, *value);
 221 }
 222
 223 static int omap_des_hw_init(struct omap_des_dev *dd)
 224 {
 225         int err;
 226
 227         /*
 228          * clocks are enabled when request starts and disabled when finished.
 229          * It may be long delays between requests.
 230          * Device might go to off mode to save power.
 231          */
 232         err = pm_runtime_resume_and_get(dd->dev);
 233         if (err < 0) {
 234                 dev_err(dd->dev, "%s: failed to get_sync(%d)\n", __func__, err);
 235                 return err;
 236         }
 237
 238         if (!(dd->flags & FLAGS_INIT)) {
 239                 dd->flags |= FLAGS_INIT;
 240                 dd->err = 0;
 241         }
 242
 243         return 0;
 244 }
 245
 246 static int omap_des_write_ctrl(struct omap_des_dev *dd)
 247 {
 248         unsigned int key32;
 249         int i, err;
 250         u32 val = 0, mask = 0;
 251
 252         err = omap_des_hw_init(dd);
 253         if (err)
 254                 return err;
 255
 256         key32 = dd->ctx->keylen / sizeof(u32);
 257
 258         /* it seems a key should always be set even if it has not changed */
 259         for (i = 0; i < key32; i++) {
 260                 omap_des_write(dd, DES_REG_KEY(dd, i),
 261                                __le32_to_cpu(dd->ctx->key[i]));
 262         }
 263
 264         if ((dd->flags & FLAGS_CBC) && dd->req->iv)
 265                 omap_des_write_n(dd, DES_REG_IV(dd, 0), (void *)dd->req->iv, 2);
 266
 267         if (dd->flags & FLAGS_CBC)
 268                 val |= DES_REG_CTRL_CBC;
 269         if (dd->flags & FLAGS_ENCRYPT)
 270                 val |= DES_REG_CTRL_DIRECTION;
 271         if (key32 == 6)
 272                 val |= DES_REG_CTRL_TDES;
 273
 274         mask |= DES_REG_CTRL_CBC | DES_REG_CTRL_DIRECTION | DES_REG_CTRL_TDES;
 275
 276         omap_des_write_mask(dd, DES_REG_CTRL(dd), val, mask);
 277
 278         return 0;
 279 }
 280
 281 static void omap_des_dma_trigger_omap4(struct omap_des_dev *dd, int length)
 282 {
 283         u32 mask, val;
 284
 285         omap_des_write(dd, DES_REG_LENGTH_N(0), length);
 286
 287         val = dd->pdata->dma_start;
 288
 289         if (dd->dma_lch_out != NULL)
 290                 val |= dd->pdata->dma_enable_out;
 291         if (dd->dma_lch_in != NULL)
 292                 val |= dd->pdata->dma_enable_in;
 293
 294         mask = dd->pdata->dma_enable_out | dd->pdata->dma_enable_in |
 295                dd->pdata->dma_start;
 296
 297         omap_des_write_mask(dd, DES_REG_MASK(dd), val, mask);
 298 }
 299
 300 static void omap_des_dma_stop(struct omap_des_dev *dd)
 301 {
 302         u32 mask;
 303
 304         mask = dd->pdata->dma_enable_out | dd->pdata->dma_enable_in |
 305                dd->pdata->dma_start;
 306
 307         omap_des_write_mask(dd, DES_REG_MASK(dd), 0, mask);
 308 }
 309
 310 static struct omap_des_dev *omap_des_find_dev(struct omap_des_ctx *ctx)
 311 {
 312         struct omap_des_dev *dd = NULL, *tmp;
 313
 314         spin_lock_bh(&list_lock);
 315         if (!ctx->dd) {
 316                 list_for_each_entry(tmp, &dev_list, list) {
 317                         /* FIXME: take fist available des core */
 318                         dd = tmp;
 319                         break;
 320                 }
 321                 ctx->dd = dd;
 322         } else {
 323                 /* already found before */
 324                 dd = ctx->dd;
 325         }
 326         spin_unlock_bh(&list_lock);
 327
 328         return dd;
 329 }
 330
 331 static void omap_des_dma_out_callback(void *data)
 332 {
 333         struct omap_des_dev *dd = data;
 334
 335         /* dma_lch_out - completed */
 336         tasklet_schedule(&dd->done_task);
 337 }
 338
 339 static int omap_des_dma_init(struct omap_des_dev *dd)
 340 {
 341         int err;
 342
 343         dd->dma_lch_out = NULL;
 344         dd->dma_lch_in = NULL;
 345
 346         dd->dma_lch_in = dma_request_chan(dd->dev, "rx");
 347         if (IS_ERR(dd->dma_lch_in)) {
 348                 dev_err(dd->dev, "Unable to request in DMA channel\n");
 349                 return PTR_ERR(dd->dma_lch_in);
 350         }
 351
 352         dd->dma_lch_out = dma_request_chan(dd->dev, "tx");
 353         if (IS_ERR(dd->dma_lch_out)) {
 354                 dev_err(dd->dev, "Unable to request out DMA channel\n");
 355                 err = PTR_ERR(dd->dma_lch_out);
 356                 goto err_dma_out;
 357         }
 358
 359         return 0;
 360
 361 err_dma_out:
 362         dma_release_channel(dd->dma_lch_in);
 363
 364         return err;
 365 }
 366
 367 static void omap_des_dma_cleanup(struct omap_des_dev *dd)
 368 {
 369         if (dd->pio_only)
 370                 return;
 371
 372         dma_release_channel(dd->dma_lch_out);
 373         dma_release_channel(dd->dma_lch_in);
 374 }
 375
 376 static int omap_des_crypt_dma(struct crypto_tfm *tfm,
 377                 struct scatterlist *in_sg, struct scatterlist *out_sg,
 378                 int in_sg_len, int out_sg_len)
 379 {
 380         struct omap_des_ctx *ctx = crypto_tfm_ctx(tfm);
 381         struct omap_des_dev *dd = ctx->dd;
 382         struct dma_async_tx_descriptor *tx_in, *tx_out;
 383         struct dma_slave_config cfg;
 384         int ret;
 385
 386         if (dd->pio_only) {
 387                 scatterwalk_start(&dd->in_walk, dd->in_sg);
 388                 scatterwalk_start(&dd->out_walk, dd->out_sg);
 389
 390                 /* Enable DATAIN interrupt and let it take
 391                    care of the rest */
 392                 omap_des_write(dd, DES_REG_IRQ_ENABLE(dd), 0x2);
 393                 return 0;
 394         }
 395
 396         dma_sync_sg_for_device(dd->dev, dd->in_sg, in_sg_len, DMA_TO_DEVICE);
 397
 398         memset(&cfg, 0, sizeof(cfg));
 399
 400         cfg.src_addr = dd->phys_base + DES_REG_DATA_N(dd, 0);
 401         cfg.dst_addr = dd->phys_base + DES_REG_DATA_N(dd, 0);
 402         cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 403         cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 404         cfg.src_maxburst = DST_MAXBURST;
 405         cfg.dst_maxburst = DST_MAXBURST;
 406
 407         /* IN */
 408         ret = dmaengine_slave_config(dd->dma_lch_in, &cfg);
 409         if (ret) {
 410                 dev_err(dd->dev, "can't configure IN dmaengine slave: %d\n",
 411                         ret);
 412                 return ret;
 413         }
 414
 415         tx_in = dmaengine_prep_slave_sg(dd->dma_lch_in, in_sg, in_sg_len,
 416                                         DMA_MEM_TO_DEV,
 417                                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 418         if (!tx_in) {
 419                 dev_err(dd->dev, "IN prep_slave_sg() failed\n");
 420                 return -EINVAL;
 421         }
 422
 423         /* No callback necessary */
 424         tx_in->callback_param = dd;
 425
 426         /* OUT */
 427         ret = dmaengine_slave_config(dd->dma_lch_out, &cfg);
 428         if (ret) {
 429                 dev_err(dd->dev, "can't configure OUT dmaengine slave: %d\n",
 430                         ret);
 431                 return ret;
 432         }
 433
 434         tx_out = dmaengine_prep_slave_sg(dd->dma_lch_out, out_sg, out_sg_len,
 435                                         DMA_DEV_TO_MEM,
 436                                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 437         if (!tx_out) {
 438                 dev_err(dd->dev, "OUT prep_slave_sg() failed\n");
 439                 return -EINVAL;
 440         }
 441
 442         tx_out->callback = omap_des_dma_out_callback;
 443         tx_out->callback_param = dd;
 444
 445         dmaengine_submit(tx_in);
 446         dmaengine_submit(tx_out);
 447
 448         dma_async_issue_pending(dd->dma_lch_in);
 449         dma_async_issue_pending(dd->dma_lch_out);
 450
 451         /* start DMA */
 452         dd->pdata->trigger(dd, dd->total);
 453
 454         return 0;
 455 }
 456
 457 static int omap_des_crypt_dma_start(struct omap_des_dev *dd)
 458 {
 459         struct crypto_tfm *tfm = crypto_skcipher_tfm(
 460                                         crypto_skcipher_reqtfm(dd->req));
 461         int err;
 462
 463         pr_debug("total: %zd\n", dd->total);
 464
 465         if (!dd->pio_only) {
 466                 err = dma_map_sg(dd->dev, dd->in_sg, dd->in_sg_len,
 467                                  DMA_TO_DEVICE);
 468                 if (!err) {
 469                         dev_err(dd->dev, "dma_map_sg() error\n");
 470                         return -EINVAL;
 471                 }
 472
 473                 err = dma_map_sg(dd->dev, dd->out_sg, dd->out_sg_len,
 474                                  DMA_FROM_DEVICE);
 475                 if (!err) {
 476                         dev_err(dd->dev, "dma_map_sg() error\n");
 477                         return -EINVAL;
 478                 }
 479         }
 480
 481         err = omap_des_crypt_dma(tfm, dd->in_sg, dd->out_sg, dd->in_sg_len,
 482                                  dd->out_sg_len);
 483         if (err && !dd->pio_only) {
 484                 dma_unmap_sg(dd->dev, dd->in_sg, dd->in_sg_len, DMA_TO_DEVICE);
 485                 dma_unmap_sg(dd->dev, dd->out_sg, dd->out_sg_len,
 486                              DMA_FROM_DEVICE);
 487         }
 488
 489         return err;
 490 }
 491
 492 static void omap_des_finish_req(struct omap_des_dev *dd, int err)
 493 {
 494         struct skcipher_request *req = dd->req;
 495
 496         pr_debug("err: %d\n", err);
 497
 498         crypto_finalize_skcipher_request(dd->engine, req, err);
 499
 500         pm_runtime_mark_last_busy(dd->dev);
 501         pm_runtime_put_autosuspend(dd->dev);
 502 }
 503
 504 static int omap_des_crypt_dma_stop(struct omap_des_dev *dd)
 505 {
 506         pr_debug("total: %zd\n", dd->total);
 507
 508         omap_des_dma_stop(dd);
 509
 510         dmaengine_terminate_all(dd->dma_lch_in);
 511         dmaengine_terminate_all(dd->dma_lch_out);
 512
 513         return 0;
 514 }
 515
 516 static int omap_des_handle_queue(struct omap_des_dev *dd,
 517                                  struct skcipher_request *req)
 518 {
 519         if (req)
 520                 return crypto_transfer_skcipher_request_to_engine(dd->engine, req);
 521
 522         return 0;
 523 }
 524
 525 static int omap_des_prepare_req(struct crypto_engine *engine,
 526                                 void *areq)
 527 {
 528         struct skcipher_request *req = container_of(areq, struct skcipher_request, base);
 529         struct omap_des_ctx *ctx = crypto_skcipher_ctx(
 530                         crypto_skcipher_reqtfm(req));
 531         struct omap_des_dev *dd = omap_des_find_dev(ctx);
 532         struct omap_des_reqctx *rctx;
 533         int ret;
 534         u16 flags;
 535
 536         if (!dd)
 537                 return -ENODEV;
 538
 539         /* assign new request to device */
 540         dd->req = req;
 541         dd->total = req->cryptlen;
 542         dd->total_save = req->cryptlen;
 543         dd->in_sg = req->src;
 544         dd->out_sg = req->dst;
 545         dd->orig_out = req->dst;
 546
 547         flags = OMAP_CRYPTO_COPY_DATA;
 548         if (req->src == req->dst)
 549                 flags |= OMAP_CRYPTO_FORCE_COPY;
 550
 551         ret = omap_crypto_align_sg(&dd->in_sg, dd->total, DES_BLOCK_SIZE,
 552                                    &dd->in_sgl, flags,
 553                                    FLAGS_IN_DATA_ST_SHIFT, &dd->flags);
 554         if (ret)
 555                 return ret;
 556
 557         ret = omap_crypto_align_sg(&dd->out_sg, dd->total, DES_BLOCK_SIZE,
 558                                    &dd->out_sgl, 0,
 559                                    FLAGS_OUT_DATA_ST_SHIFT, &dd->flags);
 560         if (ret)
 561                 return ret;
 562
 563         dd->in_sg_len = sg_nents_for_len(dd->in_sg, dd->total);
 564         if (dd->in_sg_len < 0)
 565                 return dd->in_sg_len;
 566
 567         dd->out_sg_len = sg_nents_for_len(dd->out_sg, dd->total);
 568         if (dd->out_sg_len < 0)
 569                 return dd->out_sg_len;
 570
 571         rctx = skcipher_request_ctx(req);
 572         ctx = crypto_skcipher_ctx(crypto_skcipher_reqtfm(req));
 573         rctx->mode &= FLAGS_MODE_MASK;
 574         dd->flags = (dd->flags & ~FLAGS_MODE_MASK) | rctx->mode;
 575
 576         dd->ctx = ctx;
 577         ctx->dd = dd;
 578
 579         return omap_des_write_ctrl(dd);
 580 }
 581
 582 static int omap_des_crypt_req(struct crypto_engine *engine,
 583                               void *areq)
 584 {
 585         struct skcipher_request *req = container_of(areq, struct skcipher_request, base);
 586         struct omap_des_ctx *ctx = crypto_skcipher_ctx(
 587                         crypto_skcipher_reqtfm(req));
 588         struct omap_des_dev *dd = omap_des_find_dev(ctx);
 589
 590         if (!dd)
 591                 return -ENODEV;
 592
 593         return omap_des_crypt_dma_start(dd);
 594 }
 595
 596 static void omap_des_done_task(unsigned long data)
 597 {
 598         struct omap_des_dev *dd = (struct omap_des_dev *)data;
 599         int i;
 600
 601         pr_debug("enter done_task\n");
 602
 603         if (!dd->pio_only) {
 604                 dma_sync_sg_for_device(dd->dev, dd->out_sg, dd->out_sg_len,
 605                                        DMA_FROM_DEVICE);
 606                 dma_unmap_sg(dd->dev, dd->in_sg, dd->in_sg_len, DMA_TO_DEVICE);
 607                 dma_unmap_sg(dd->dev, dd->out_sg, dd->out_sg_len,
 608                              DMA_FROM_DEVICE);
 609                 omap_des_crypt_dma_stop(dd);
 610         }
 611
 612         omap_crypto_cleanup(&dd->in_sgl, NULL, 0, dd->total_save,
 613                             FLAGS_IN_DATA_ST_SHIFT, dd->flags);
 614
 615         omap_crypto_cleanup(&dd->out_sgl, dd->orig_out, 0, dd->total_save,
 616                             FLAGS_OUT_DATA_ST_SHIFT, dd->flags);
 617
 618         if ((dd->flags & FLAGS_CBC) && dd->req->iv)
 619                 for (i = 0; i < 2; i++)
 620                         ((u32 *)dd->req->iv)[i] =
 621                                 omap_des_read(dd, DES_REG_IV(dd, i));
 622
 623         omap_des_finish_req(dd, 0);
 624
 625         pr_debug("exit\n");
 626 }
 627
 628 static int omap_des_crypt(struct skcipher_request *req, unsigned long mode)
 629 {
 630         struct omap_des_ctx *ctx = crypto_skcipher_ctx(
 631                         crypto_skcipher_reqtfm(req));
 632         struct omap_des_reqctx *rctx = skcipher_request_ctx(req);
 633         struct omap_des_dev *dd;
 634
 635         pr_debug("nbytes: %d, enc: %d, cbc: %d\n", req->cryptlen,
 636                  !!(mode & FLAGS_ENCRYPT),
 637                  !!(mode & FLAGS_CBC));
 638
 639         if (!req->cryptlen)
 640                 return 0;
 641
 642         if (!IS_ALIGNED(req->cryptlen, DES_BLOCK_SIZE))
 643                 return -EINVAL;
 644
 645         dd = omap_des_find_dev(ctx);
 646         if (!dd)
 647                 return -ENODEV;
 648
 649         rctx->mode = mode;
 650
 651         return omap_des_handle_queue(dd, req);
 652 }
 653
 654 /* ********************** ALG API ************************************ */
 655
 656 static int omap_des_setkey(struct crypto_skcipher *cipher, const u8 *key,
 657                            unsigned int keylen)
 658 {
 659         struct omap_des_ctx *ctx = crypto_skcipher_ctx(cipher);
 660         int err;
 661
 662         pr_debug("enter, keylen: %d\n", keylen);
 663
 664         err = verify_skcipher_des_key(cipher, key);
 665         if (err)
 666                 return err;
 667
 668         memcpy(ctx->key, key, keylen);
 669         ctx->keylen = keylen;
 670
 671         return 0;
 672 }
 673
 674 static int omap_des3_setkey(struct crypto_skcipher *cipher, const u8 *key,
 675                             unsigned int keylen)
 676 {
 677         struct omap_des_ctx *ctx = crypto_skcipher_ctx(cipher);
 678         int err;
 679
 680         pr_debug("enter, keylen: %d\n", keylen);
 681
 682         err = verify_skcipher_des3_key(cipher, key);
 683         if (err)
 684                 return err;
 685
 686         memcpy(ctx->key, key, keylen);
 687         ctx->keylen = keylen;
 688
 689         return 0;
 690 }
 691
 692 static int omap_des_ecb_encrypt(struct skcipher_request *req)
 693 {
 694         return omap_des_crypt(req, FLAGS_ENCRYPT);
 695 }
 696
 697 static int omap_des_ecb_decrypt(struct skcipher_request *req)
 698 {
 699         return omap_des_crypt(req, 0);
 700 }
 701
 702 static int omap_des_cbc_encrypt(struct skcipher_request *req)
 703 {
 704         return omap_des_crypt(req, FLAGS_ENCRYPT | FLAGS_CBC);
 705 }
 706
 707 static int omap_des_cbc_decrypt(struct skcipher_request *req)
 708 {
 709         return omap_des_crypt(req, FLAGS_CBC);
 710 }
 711
 712 static int omap_des_prepare_req(struct crypto_engine *engine,
 713                                 void *areq);
 714 static int omap_des_crypt_req(struct crypto_engine *engine,
 715                               void *areq);
 716
 717 static int omap_des_init_tfm(struct crypto_skcipher *tfm)
 718 {
 719         struct omap_des_ctx *ctx = crypto_skcipher_ctx(tfm);
 720
 721         pr_debug("enter\n");
 722
 723         crypto_skcipher_set_reqsize(tfm, sizeof(struct omap_des_reqctx));
 724
 725         ctx->enginectx.op.prepare_request = omap_des_prepare_req;
 726         ctx->enginectx.op.unprepare_request = NULL;
 727         ctx->enginectx.op.do_one_request = omap_des_crypt_req;
 728
 729         return 0;
 730 }
 731
 732 /* ********************** ALGS ************************************ */
 733
 734 static struct skcipher_alg algs_ecb_cbc[] = {
 735 {
 736         .base.cra_name          = "ecb(des)",
 737         .base.cra_driver_name   = "ecb-des-omap",
 738         .base.cra_priority      = 100,
 739         .base.cra_flags         = CRYPTO_ALG_KERN_DRIVER_ONLY |
 740                                   CRYPTO_ALG_ASYNC,
 741         .base.cra_blocksize     = DES_BLOCK_SIZE,
 742         .base.cra_ctxsize       = sizeof(struct omap_des_ctx),
 743         .base.cra_module        = THIS_MODULE,
 744
 745         .min_keysize            = DES_KEY_SIZE,
 746         .max_keysize            = DES_KEY_SIZE,
 747         .setkey                 = omap_des_setkey,
 748         .encrypt                = omap_des_ecb_encrypt,
 749         .decrypt                = omap_des_ecb_decrypt,
 750         .init                   = omap_des_init_tfm,
 751 },
 752 {
 753         .base.cra_name          = "cbc(des)",
 754         .base.cra_driver_name   = "cbc-des-omap",
 755         .base.cra_priority      = 100,
 756         .base.cra_flags         = CRYPTO_ALG_KERN_DRIVER_ONLY |
 757                                   CRYPTO_ALG_ASYNC,
 758         .base.cra_blocksize     = DES_BLOCK_SIZE,
 759         .base.cra_ctxsize       = sizeof(struct omap_des_ctx),
 760         .base.cra_module        = THIS_MODULE,
 761
 762         .min_keysize            = DES_KEY_SIZE,
 763         .max_keysize            = DES_KEY_SIZE,
 764         .ivsize                 = DES_BLOCK_SIZE,
 765         .setkey                 = omap_des_setkey,
 766         .encrypt                = omap_des_cbc_encrypt,
 767         .decrypt                = omap_des_cbc_decrypt,
 768         .init                   = omap_des_init_tfm,
 769 },
 770 {
 771         .base.cra_name          = "ecb(des3_ede)",
 772         .base.cra_driver_name   = "ecb-des3-omap",
 773         .base.cra_priority      = 100,
 774         .base.cra_flags         = CRYPTO_ALG_KERN_DRIVER_ONLY |
 775                                   CRYPTO_ALG_ASYNC,
 776         .base.cra_blocksize     = DES3_EDE_BLOCK_SIZE,
 777         .base.cra_ctxsize       = sizeof(struct omap_des_ctx),
 778         .base.cra_module        = THIS_MODULE,
 779
 780         .min_keysize            = DES3_EDE_KEY_SIZE,
 781         .max_keysize            = DES3_EDE_KEY_SIZE,
 782         .setkey                 = omap_des3_setkey,
 783         .encrypt                = omap_des_ecb_encrypt,
 784         .decrypt                = omap_des_ecb_decrypt,
 785         .init                   = omap_des_init_tfm,
 786 },
 787 {
 788         .base.cra_name          = "cbc(des3_ede)",
 789         .base.cra_driver_name   = "cbc-des3-omap",
 790         .base.cra_priority      = 100,
 791         .base.cra_flags         = CRYPTO_ALG_KERN_DRIVER_ONLY |
 792                                   CRYPTO_ALG_ASYNC,
 793         .base.cra_blocksize     = DES3_EDE_BLOCK_SIZE,
 794         .base.cra_ctxsize       = sizeof(struct omap_des_ctx),
 795         .base.cra_module        = THIS_MODULE,
 796
 797         .min_keysize            = DES3_EDE_KEY_SIZE,
 798         .max_keysize            = DES3_EDE_KEY_SIZE,
 799         .ivsize                 = DES3_EDE_BLOCK_SIZE,
 800         .setkey                 = omap_des3_setkey,
 801         .encrypt                = omap_des_cbc_encrypt,
 802         .decrypt                = omap_des_cbc_decrypt,
 803         .init                   = omap_des_init_tfm,
 804 }
 805 };
 806
 807 static struct omap_des_algs_info omap_des_algs_info_ecb_cbc[] = {
 808         {
 809                 .algs_list      = algs_ecb_cbc,
 810                 .size           = ARRAY_SIZE(algs_ecb_cbc),
 811         },
 812 };
 813
 814 #ifdef CONFIG_OF
 815 static const struct omap_des_pdata omap_des_pdata_omap4 = {
 816         .algs_info      = omap_des_algs_info_ecb_cbc,
 817         .algs_info_size = ARRAY_SIZE(omap_des_algs_info_ecb_cbc),
 818         .trigger        = omap_des_dma_trigger_omap4,
 819         .key_ofs        = 0x14,
 820         .iv_ofs         = 0x18,
 821         .ctrl_ofs       = 0x20,
 822         .data_ofs       = 0x28,
 823         .rev_ofs        = 0x30,
 824         .mask_ofs       = 0x34,
 825         .irq_status_ofs = 0x3c,
 826         .irq_enable_ofs = 0x40,
 827         .dma_enable_in  = BIT(5),
 828         .dma_enable_out = BIT(6),
 829         .major_mask     = 0x0700,
 830         .major_shift    = 8,
 831         .minor_mask     = 0x003f,
 832         .minor_shift    = 0,
 833 };
 834
 835 static irqreturn_t omap_des_irq(int irq, void *dev_id)
 836 {
 837         struct omap_des_dev *dd = dev_id;
 838         u32 status, i;
 839         u32 *src, *dst;
 840
 841         status = omap_des_read(dd, DES_REG_IRQ_STATUS(dd));
 842         if (status & DES_REG_IRQ_DATA_IN) {
 843                 omap_des_write(dd, DES_REG_IRQ_ENABLE(dd), 0x0);
 844
 845                 BUG_ON(!dd->in_sg);
 846
 847                 BUG_ON(_calc_walked(in) > dd->in_sg->length);
 848
 849                 src = sg_virt(dd->in_sg) + _calc_walked(in);
 850
 851                 for (i = 0; i < DES_BLOCK_WORDS; i++) {
 852                         omap_des_write(dd, DES_REG_DATA_N(dd, i), *src);
 853
 854                         scatterwalk_advance(&dd->in_walk, 4);
 855                         if (dd->in_sg->length == _calc_walked(in)) {
 856                                 dd->in_sg = sg_next(dd->in_sg);
 857                                 if (dd->in_sg) {
 858                                         scatterwalk_start(&dd->in_walk,
 859                                                           dd->in_sg);
 860                                         src = sg_virt(dd->in_sg) +
 861                                               _calc_walked(in);
 862                                 }
 863                         } else {
 864                                 src++;
 865                         }
 866                 }
 867
 868                 /* Clear IRQ status */
 869                 status &= ~DES_REG_IRQ_DATA_IN;
 870                 omap_des_write(dd, DES_REG_IRQ_STATUS(dd), status);
 871
 872                 /* Enable DATA_OUT interrupt */
 873                 omap_des_write(dd, DES_REG_IRQ_ENABLE(dd), 0x4);
 874
 875         } else if (status & DES_REG_IRQ_DATA_OUT) {
 876                 omap_des_write(dd, DES_REG_IRQ_ENABLE(dd), 0x0);
 877
 878                 BUG_ON(!dd->out_sg);
 879
 880                 BUG_ON(_calc_walked(out) > dd->out_sg->length);
 881
 882                 dst = sg_virt(dd->out_sg) + _calc_walked(out);
 883
 884                 for (i = 0; i < DES_BLOCK_WORDS; i++) {
 885                         *dst = omap_des_read(dd, DES_REG_DATA_N(dd, i));
 886                         scatterwalk_advance(&dd->out_walk, 4);
 887                         if (dd->out_sg->length == _calc_walked(out)) {
 888                                 dd->out_sg = sg_next(dd->out_sg);
 889                                 if (dd->out_sg) {
 890                                         scatterwalk_start(&dd->out_walk,
 891                                                           dd->out_sg);
 892                                         dst = sg_virt(dd->out_sg) +
 893                                               _calc_walked(out);
 894                                 }
 895                         } else {
 896                                 dst++;
 897                         }
 898                 }
 899
 900                 BUG_ON(dd->total < DES_BLOCK_SIZE);
 901
 902                 dd->total -= DES_BLOCK_SIZE;
 903
 904                 /* Clear IRQ status */
 905                 status &= ~DES_REG_IRQ_DATA_OUT;
 906                 omap_des_write(dd, DES_REG_IRQ_STATUS(dd), status);
 907
 908                 if (!dd->total)
 909                         /* All bytes read! */
 910                         tasklet_schedule(&dd->done_task);
 911                 else
 912                         /* Enable DATA_IN interrupt for next block */
 913                         omap_des_write(dd, DES_REG_IRQ_ENABLE(dd), 0x2);
 914         }
 915
 916         return IRQ_HANDLED;
 917 }
 918
 919 static const struct of_device_id omap_des_of_match[] = {
 920         {
 921                 .compatible     = "ti,omap4-des",
 922                 .data           = &omap_des_pdata_omap4,
 923         },
 924         {},
 925 };
 926 MODULE_DEVICE_TABLE(of, omap_des_of_match);
 927
 928 static int omap_des_get_of(struct omap_des_dev *dd,
 929                 struct platform_device *pdev)
 930 {
 931
 932         dd->pdata = of_device_get_match_data(&pdev->dev);
 933         if (!dd->pdata) {
 934                 dev_err(&pdev->dev, "no compatible OF match\n");
 935                 return -EINVAL;
 936         }
 937
 938         return 0;
 939 }
 940 #else
 941 static int omap_des_get_of(struct omap_des_dev *dd,
 942                 struct device *dev)
 943 {
 944         return -EINVAL;
 945 }
 946 #endif
 947
 948 static int omap_des_get_pdev(struct omap_des_dev *dd,
 949                 struct platform_device *pdev)
 950 {
 951         /* non-DT devices get pdata from pdev */
 952         dd->pdata = pdev->dev.platform_data;
 953
 954         return 0;
 955 }
 956
 957 static int omap_des_probe(struct platform_device *pdev)
 958 {
 959         struct device *dev = &pdev->dev;
 960         struct omap_des_dev *dd;
 961         struct skcipher_alg *algp;
 962         struct resource *res;
 963         int err = -ENOMEM, i, j, irq = -1;
 964         u32 reg;
 965
 966         dd = devm_kzalloc(dev, sizeof(struct omap_des_dev), GFP_KERNEL);
 967         if (dd == NULL) {
 968                 dev_err(dev, "unable to alloc data struct.\n");
 969                 goto err_data;
 970         }
 971         dd->dev = dev;
 972         platform_set_drvdata(pdev, dd);
 973
 974         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 975         if (!res) {
 976                 dev_err(dev, "no MEM resource info\n");
 977                 goto err_res;
 978         }
 979
 980         err = (dev->of_node) ? omap_des_get_of(dd, pdev) :
 981                                omap_des_get_pdev(dd, pdev);
 982         if (err)
 983                 goto err_res;
 984
 985         dd->io_base = devm_ioremap_resource(dev, res);
 986         if (IS_ERR(dd->io_base)) {
 987                 err = PTR_ERR(dd->io_base);
 988                 goto err_res;
 989         }
 990         dd->phys_base = res->start;
 991
 992         pm_runtime_use_autosuspend(dev);
 993         pm_runtime_set_autosuspend_delay(dev, DEFAULT_AUTOSUSPEND_DELAY);
 994
 995         pm_runtime_enable(dev);
 996         err = pm_runtime_resume_and_get(dev);
 997         if (err < 0) {
 998                 dev_err(dd->dev, "%s: failed to get_sync(%d)\n", __func__, err);
 999                 goto err_get;
1000         }
1001
1002         omap_des_dma_stop(dd);
1003
1004         reg = omap_des_read(dd, DES_REG_REV(dd));
1005
1006         pm_runtime_put_sync(dev);
1007
1008         dev_info(dev, "OMAP DES hw accel rev: %u.%u\n",
1009                  (reg & dd->pdata->major_mask) >> dd->pdata->major_shift,
1010                  (reg & dd->pdata->minor_mask) >> dd->pdata->minor_shift);
1011
1012         tasklet_init(&dd->done_task, omap_des_done_task, (unsigned long)dd);
1013
1014         err = omap_des_dma_init(dd);
1015         if (err == -EPROBE_DEFER) {
1016                 goto err_irq;
1017         } else if (err && DES_REG_IRQ_STATUS(dd) && DES_REG_IRQ_ENABLE(dd)) {
1018                 dd->pio_only = 1;
1019
1020                 irq = platform_get_irq(pdev, 0);
1021                 if (irq < 0) {
1022                         err = irq;
1023                         goto err_irq;
1024                 }
1025
1026                 err = devm_request_irq(dev, irq, omap_des_irq, 0,
1027                                 dev_name(dev), dd);
1028                 if (err) {
1029                         dev_err(dev, "Unable to grab omap-des IRQ\n");
1030                         goto err_irq;
1031                 }
1032         }
1033
1034
1035         INIT_LIST_HEAD(&dd->list);
1036         spin_lock_bh(&list_lock);
1037         list_add_tail(&dd->list, &dev_list);
1038         spin_unlock_bh(&list_lock);
1039
1040         /* Initialize des crypto engine */
1041         dd->engine = crypto_engine_alloc_init(dev, 1);
1042         if (!dd->engine) {
1043                 err = -ENOMEM;
1044                 goto err_engine;
1045         }
1046
1047         err = crypto_engine_start(dd->engine);
1048         if (err)
1049                 goto err_engine;
1050
1051         for (i = 0; i < dd->pdata->algs_info_size; i++) {
1052                 for (j = 0; j < dd->pdata->algs_info[i].size; j++) {
1053                         algp = &dd->pdata->algs_info[i].algs_list[j];
1054
1055                         pr_debug("reg alg: %s\n", algp->base.cra_name);
1056
1057                         err = crypto_register_skcipher(algp);
1058                         if (err)
1059                                 goto err_algs;
1060
1061                         dd->pdata->algs_info[i].registered++;
1062                 }
1063         }
1064
1065         return 0;
1066
1067 err_algs:
1068         for (i = dd->pdata->algs_info_size - 1; i >= 0; i--)
1069                 for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--)
1070                         crypto_unregister_skcipher(
1071                                         &dd->pdata->algs_info[i].algs_list[j]);
1072
1073 err_engine:
1074         if (dd->engine)
1075                 crypto_engine_exit(dd->engine);
1076
1077         omap_des_dma_cleanup(dd);
1078 err_irq:
1079         tasklet_kill(&dd->done_task);
1080 err_get:
1081         pm_runtime_disable(dev);
1082 err_res:
1083         dd = NULL;
1084 err_data:
1085         dev_err(dev, "initialization failed.\n");
1086         return err;
1087 }
1088
1089 static int omap_des_remove(struct platform_device *pdev)
1090 {
1091         struct omap_des_dev *dd = platform_get_drvdata(pdev);
1092         int i, j;
1093
1094         if (!dd)
1095                 return -ENODEV;
1096
1097         spin_lock_bh(&list_lock);
1098         list_del(&dd->list);
1099         spin_unlock_bh(&list_lock);
1100
1101         for (i = dd->pdata->algs_info_size - 1; i >= 0; i--)
1102                 for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--)
1103                         crypto_unregister_skcipher(
1104                                         &dd->pdata->algs_info[i].algs_list[j]);
1105
1106         tasklet_kill(&dd->done_task);
1107         omap_des_dma_cleanup(dd);
1108         pm_runtime_disable(dd->dev);
1109         dd = NULL;
1110
1111         return 0;
1112 }
1113
1114 #ifdef CONFIG_PM_SLEEP
1115 static int omap_des_suspend(struct device *dev)
1116 {
1117         pm_runtime_put_sync(dev);
1118         return 0;
1119 }
1120
1121 static int omap_des_resume(struct device *dev)
1122 {
1123         int err;
1124
1125         err = pm_runtime_resume_and_get(dev);
1126         if (err < 0) {
1127                 dev_err(dev, "%s: failed to get_sync(%d)\n", __func__, err);
1128                 return err;
1129         }
1130         return 0;
1131 }
1132 #endif
1133
1134 static SIMPLE_DEV_PM_OPS(omap_des_pm_ops, omap_des_suspend, omap_des_resume);
1135
1136 static struct platform_driver omap_des_driver = {
1137         .probe  = omap_des_probe,
1138         .remove = omap_des_remove,
1139         .driver = {
1140                 .name   = "omap-des",
1141                 .pm     = &omap_des_pm_ops,
1142                 .of_match_table = of_match_ptr(omap_des_of_match),
1143         },
1144 };
1145
1146 module_platform_driver(omap_des_driver);
1147
1148 MODULE_DESCRIPTION("OMAP DES hw acceleration support.");
1149 MODULE_LICENSE("GPL v2");
1150 MODULE_AUTHOR("Joel Fernandes <joelf@ti.com>");