1 /* 2 * Cryptographic API. 3 * 4 * Support for OMAP AES HW acceleration. 5 * 6 * Copyright (c) 2010 Nokia Corporation 7 * Author: Dmitry Kasatkin <dmitry.kasatkin@nokia.com> 8 * Copyright (c) 2011 Texas Instruments Incorporated 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License version 2 as published 12 * by the Free Software Foundation. 13 * 14 */ 15 16 #define pr_fmt(fmt) "%20s: " fmt, __func__ 17 #define prn(num) pr_debug(#num "=%d\n", num) 18 #define prx(num) pr_debug(#num "=%x\n", num) 19 20 #include <linux/err.h> 21 #include <linux/module.h> 22 #include <linux/init.h> 23 #include <linux/errno.h> 24 #include <linux/kernel.h> 25 #include <linux/platform_device.h> 26 #include <linux/scatterlist.h> 27 #include <linux/dma-mapping.h> 28 #include <linux/dmaengine.h> 29 #include <linux/omap-dma.h> 30 #include <linux/pm_runtime.h> 31 #include <linux/of.h> 32 #include <linux/of_device.h> 33 #include <linux/of_address.h> 34 #include <linux/io.h> 35 #include <linux/crypto.h> 36 #include <linux/interrupt.h> 37 #include <crypto/scatterwalk.h> 38 #include <crypto/aes.h> 39 40 #define DST_MAXBURST 4 41 #define DMA_MIN (DST_MAXBURST * sizeof(u32)) 42 43 #define _calc_walked(inout) (dd->inout##_walk.offset - dd->inout##_sg->offset) 44 45 /* OMAP TRM gives bitfields as start:end, where start is the higher bit 46 number. For example 7:0 */ 47 #define FLD_MASK(start, end) (((1 << ((start) - (end) + 1)) - 1) << (end)) 48 #define FLD_VAL(val, start, end) (((val) << (end)) & FLD_MASK(start, end)) 49 50 #define AES_REG_KEY(dd, x) ((dd)->pdata->key_ofs - \ 51 ((x ^ 0x01) * 0x04)) 52 #define AES_REG_IV(dd, x) ((dd)->pdata->iv_ofs + ((x) * 0x04)) 53 54 #define AES_REG_CTRL(dd) ((dd)->pdata->ctrl_ofs) 55 #define AES_REG_CTRL_CTR_WIDTH_MASK (3 << 7) 56 #define AES_REG_CTRL_CTR_WIDTH_32 (0 << 7) 57 #define AES_REG_CTRL_CTR_WIDTH_64 (1 << 7) 58 #define AES_REG_CTRL_CTR_WIDTH_96 (2 << 7) 59 #define AES_REG_CTRL_CTR_WIDTH_128 (3 << 7) 60 #define AES_REG_CTRL_CTR (1 << 6) 61 #define AES_REG_CTRL_CBC (1 << 5) 62 #define AES_REG_CTRL_KEY_SIZE (3 << 3) 63 #define AES_REG_CTRL_DIRECTION (1 << 2) 64 #define AES_REG_CTRL_INPUT_READY (1 << 1) 65 #define AES_REG_CTRL_OUTPUT_READY (1 << 0) 66 67 #define AES_REG_DATA_N(dd, x) ((dd)->pdata->data_ofs + ((x) * 0x04)) 68 69 #define AES_REG_REV(dd) ((dd)->pdata->rev_ofs) 70 71 #define AES_REG_MASK(dd) ((dd)->pdata->mask_ofs) 72 #define AES_REG_MASK_SIDLE (1 << 6) 73 #define AES_REG_MASK_START (1 << 5) 74 #define AES_REG_MASK_DMA_OUT_EN (1 << 3) 75 #define AES_REG_MASK_DMA_IN_EN (1 << 2) 76 #define AES_REG_MASK_SOFTRESET (1 << 1) 77 #define AES_REG_AUTOIDLE (1 << 0) 78 79 #define AES_REG_LENGTH_N(x) (0x54 + ((x) * 0x04)) 80 81 #define AES_REG_IRQ_STATUS(dd) ((dd)->pdata->irq_status_ofs) 82 #define AES_REG_IRQ_ENABLE(dd) ((dd)->pdata->irq_enable_ofs) 83 #define AES_REG_IRQ_DATA_IN BIT(1) 84 #define AES_REG_IRQ_DATA_OUT BIT(2) 85 #define DEFAULT_TIMEOUT (5*HZ) 86 87 #define FLAGS_MODE_MASK 0x000f 88 #define FLAGS_ENCRYPT BIT(0) 89 #define FLAGS_CBC BIT(1) 90 #define FLAGS_GIV BIT(2) 91 #define FLAGS_CTR BIT(3) 92 93 #define FLAGS_INIT BIT(4) 94 #define FLAGS_FAST BIT(5) 95 #define FLAGS_BUSY BIT(6) 96 97 #define AES_BLOCK_WORDS (AES_BLOCK_SIZE >> 2) 98 99 struct omap_aes_ctx { 100 struct omap_aes_dev *dd; 101 102 int keylen; 103 u32 key[AES_KEYSIZE_256 / sizeof(u32)]; 104 unsigned long flags; 105 }; 106 107 struct omap_aes_reqctx { 108 unsigned long mode; 109 }; 110 111 #define OMAP_AES_QUEUE_LENGTH 1 112 #define OMAP_AES_CACHE_SIZE 0 113 114 struct omap_aes_algs_info { 115 struct crypto_alg *algs_list; 116 unsigned int size; 117 unsigned int registered; 118 }; 119 120 struct omap_aes_pdata { 121 struct omap_aes_algs_info *algs_info; 122 unsigned int algs_info_size; 123 124 void (*trigger)(struct omap_aes_dev *dd, int length); 125 126 u32 key_ofs; 127 u32 iv_ofs; 128 u32 ctrl_ofs; 129 u32 data_ofs; 130 u32 rev_ofs; 131 u32 mask_ofs; 132 u32 irq_enable_ofs; 133 u32 irq_status_ofs; 134 135 u32 dma_enable_in; 136 u32 dma_enable_out; 137 u32 dma_start; 138 139 u32 major_mask; 140 u32 major_shift; 141 u32 minor_mask; 142 u32 minor_shift; 143 }; 144 145 struct omap_aes_dev { 146 struct list_head list; 147 unsigned long phys_base; 148 void __iomem *io_base; 149 struct omap_aes_ctx *ctx; 150 struct device *dev; 151 unsigned long flags; 152 int err; 153 154 spinlock_t lock; 155 struct crypto_queue queue; 156 157 struct tasklet_struct done_task; 158 struct tasklet_struct queue_task; 159 160 struct ablkcipher_request *req; 161 162 /* 163 * total is used by PIO mode for book keeping so introduce 164 * variable total_save as need it to calc page_order 165 */ 166 size_t total; 167 size_t total_save; 168 169 struct scatterlist *in_sg; 170 struct scatterlist *out_sg; 171 172 /* Buffers for copying for unaligned cases */ 173 struct scatterlist in_sgl; 174 struct scatterlist out_sgl; 175 struct scatterlist *orig_out; 176 int sgs_copied; 177 178 struct scatter_walk in_walk; 179 struct scatter_walk out_walk; 180 int dma_in; 181 struct dma_chan *dma_lch_in; 182 int dma_out; 183 struct dma_chan *dma_lch_out; 184 int in_sg_len; 185 int out_sg_len; 186 int pio_only; 187 const struct omap_aes_pdata *pdata; 188 }; 189 190 /* keep registered devices data here */ 191 static LIST_HEAD(dev_list); 192 static DEFINE_SPINLOCK(list_lock); 193 194 #ifdef DEBUG 195 #define omap_aes_read(dd, offset) \ 196 ({ \ 197 int _read_ret; \ 198 _read_ret = __raw_readl(dd->io_base + offset); \ 199 pr_debug("omap_aes_read(" #offset "=%#x)= %#x\n", \ 200 offset, _read_ret); \ 201 _read_ret; \ 202 }) 203 #else 204 static inline u32 omap_aes_read(struct omap_aes_dev *dd, u32 offset) 205 { 206 return __raw_readl(dd->io_base + offset); 207 } 208 #endif 209 210 #ifdef DEBUG 211 #define omap_aes_write(dd, offset, value) \ 212 do { \ 213 pr_debug("omap_aes_write(" #offset "=%#x) value=%#x\n", \ 214 offset, value); \ 215 __raw_writel(value, dd->io_base + offset); \ 216 } while (0) 217 #else 218 static inline void omap_aes_write(struct omap_aes_dev *dd, u32 offset, 219 u32 value) 220 { 221 __raw_writel(value, dd->io_base + offset); 222 } 223 #endif 224 225 static inline void omap_aes_write_mask(struct omap_aes_dev *dd, u32 offset, 226 u32 value, u32 mask) 227 { 228 u32 val; 229 230 val = omap_aes_read(dd, offset); 231 val &= ~mask; 232 val |= value; 233 omap_aes_write(dd, offset, val); 234 } 235 236 static void omap_aes_write_n(struct omap_aes_dev *dd, u32 offset, 237 u32 *value, int count) 238 { 239 for (; count--; value++, offset += 4) 240 omap_aes_write(dd, offset, *value); 241 } 242 243 static int omap_aes_hw_init(struct omap_aes_dev *dd) 244 { 245 if (!(dd->flags & FLAGS_INIT)) { 246 dd->flags |= FLAGS_INIT; 247 dd->err = 0; 248 } 249 250 return 0; 251 } 252 253 static int omap_aes_write_ctrl(struct omap_aes_dev *dd) 254 { 255 unsigned int key32; 256 int i, err; 257 u32 val, mask = 0; 258 259 err = omap_aes_hw_init(dd); 260 if (err) 261 return err; 262 263 key32 = dd->ctx->keylen / sizeof(u32); 264 265 /* it seems a key should always be set even if it has not changed */ 266 for (i = 0; i < key32; i++) { 267 omap_aes_write(dd, AES_REG_KEY(dd, i), 268 __le32_to_cpu(dd->ctx->key[i])); 269 } 270 271 if ((dd->flags & (FLAGS_CBC | FLAGS_CTR)) && dd->req->info) 272 omap_aes_write_n(dd, AES_REG_IV(dd, 0), dd->req->info, 4); 273 274 val = FLD_VAL(((dd->ctx->keylen >> 3) - 1), 4, 3); 275 if (dd->flags & FLAGS_CBC) 276 val |= AES_REG_CTRL_CBC; 277 if (dd->flags & FLAGS_CTR) { 278 val |= AES_REG_CTRL_CTR | AES_REG_CTRL_CTR_WIDTH_128; 279 mask = AES_REG_CTRL_CTR | AES_REG_CTRL_CTR_WIDTH_MASK; 280 } 281 if (dd->flags & FLAGS_ENCRYPT) 282 val |= AES_REG_CTRL_DIRECTION; 283 284 mask |= AES_REG_CTRL_CBC | AES_REG_CTRL_DIRECTION | 285 AES_REG_CTRL_KEY_SIZE; 286 287 omap_aes_write_mask(dd, AES_REG_CTRL(dd), val, mask); 288 289 return 0; 290 } 291 292 static void omap_aes_dma_trigger_omap2(struct omap_aes_dev *dd, int length) 293 { 294 u32 mask, val; 295 296 val = dd->pdata->dma_start; 297 298 if (dd->dma_lch_out != NULL) 299 val |= dd->pdata->dma_enable_out; 300 if (dd->dma_lch_in != NULL) 301 val |= dd->pdata->dma_enable_in; 302 303 mask = dd->pdata->dma_enable_out | dd->pdata->dma_enable_in | 304 dd->pdata->dma_start; 305 306 omap_aes_write_mask(dd, AES_REG_MASK(dd), val, mask); 307 308 } 309 310 static void omap_aes_dma_trigger_omap4(struct omap_aes_dev *dd, int length) 311 { 312 omap_aes_write(dd, AES_REG_LENGTH_N(0), length); 313 omap_aes_write(dd, AES_REG_LENGTH_N(1), 0); 314 315 omap_aes_dma_trigger_omap2(dd, length); 316 } 317 318 static void omap_aes_dma_stop(struct omap_aes_dev *dd) 319 { 320 u32 mask; 321 322 mask = dd->pdata->dma_enable_out | dd->pdata->dma_enable_in | 323 dd->pdata->dma_start; 324 325 omap_aes_write_mask(dd, AES_REG_MASK(dd), 0, mask); 326 } 327 328 static struct omap_aes_dev *omap_aes_find_dev(struct omap_aes_ctx *ctx) 329 { 330 struct omap_aes_dev *dd = NULL, *tmp; 331 332 spin_lock_bh(&list_lock); 333 if (!ctx->dd) { 334 list_for_each_entry(tmp, &dev_list, list) { 335 /* FIXME: take fist available aes core */ 336 dd = tmp; 337 break; 338 } 339 ctx->dd = dd; 340 } else { 341 /* already found before */ 342 dd = ctx->dd; 343 } 344 spin_unlock_bh(&list_lock); 345 346 return dd; 347 } 348 349 static void omap_aes_dma_out_callback(void *data) 350 { 351 struct omap_aes_dev *dd = data; 352 353 /* dma_lch_out - completed */ 354 tasklet_schedule(&dd->done_task); 355 } 356 357 static int omap_aes_dma_init(struct omap_aes_dev *dd) 358 { 359 int err = -ENOMEM; 360 dma_cap_mask_t mask; 361 362 dd->dma_lch_out = NULL; 363 dd->dma_lch_in = NULL; 364 365 dma_cap_zero(mask); 366 dma_cap_set(DMA_SLAVE, mask); 367 368 dd->dma_lch_in = dma_request_slave_channel_compat(mask, 369 omap_dma_filter_fn, 370 &dd->dma_in, 371 dd->dev, "rx"); 372 if (!dd->dma_lch_in) { 373 dev_err(dd->dev, "Unable to request in DMA channel\n"); 374 goto err_dma_in; 375 } 376 377 dd->dma_lch_out = dma_request_slave_channel_compat(mask, 378 omap_dma_filter_fn, 379 &dd->dma_out, 380 dd->dev, "tx"); 381 if (!dd->dma_lch_out) { 382 dev_err(dd->dev, "Unable to request out DMA channel\n"); 383 goto err_dma_out; 384 } 385 386 return 0; 387 388 err_dma_out: 389 dma_release_channel(dd->dma_lch_in); 390 err_dma_in: 391 if (err) 392 pr_err("error: %d\n", err); 393 return err; 394 } 395 396 static void omap_aes_dma_cleanup(struct omap_aes_dev *dd) 397 { 398 dma_release_channel(dd->dma_lch_out); 399 dma_release_channel(dd->dma_lch_in); 400 } 401 402 static void sg_copy_buf(void *buf, struct scatterlist *sg, 403 unsigned int start, unsigned int nbytes, int out) 404 { 405 struct scatter_walk walk; 406 407 if (!nbytes) 408 return; 409 410 scatterwalk_start(&walk, sg); 411 scatterwalk_advance(&walk, start); 412 scatterwalk_copychunks(buf, &walk, nbytes, out); 413 scatterwalk_done(&walk, out, 0); 414 } 415 416 static int omap_aes_crypt_dma(struct crypto_tfm *tfm, 417 struct scatterlist *in_sg, struct scatterlist *out_sg, 418 int in_sg_len, int out_sg_len) 419 { 420 struct omap_aes_ctx *ctx = crypto_tfm_ctx(tfm); 421 struct omap_aes_dev *dd = ctx->dd; 422 struct dma_async_tx_descriptor *tx_in, *tx_out; 423 struct dma_slave_config cfg; 424 int ret; 425 426 if (dd->pio_only) { 427 scatterwalk_start(&dd->in_walk, dd->in_sg); 428 scatterwalk_start(&dd->out_walk, dd->out_sg); 429 430 /* Enable DATAIN interrupt and let it take 431 care of the rest */ 432 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x2); 433 return 0; 434 } 435 436 dma_sync_sg_for_device(dd->dev, dd->in_sg, in_sg_len, DMA_TO_DEVICE); 437 438 memset(&cfg, 0, sizeof(cfg)); 439 440 cfg.src_addr = dd->phys_base + AES_REG_DATA_N(dd, 0); 441 cfg.dst_addr = dd->phys_base + AES_REG_DATA_N(dd, 0); 442 cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; 443 cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; 444 cfg.src_maxburst = DST_MAXBURST; 445 cfg.dst_maxburst = DST_MAXBURST; 446 447 /* IN */ 448 ret = dmaengine_slave_config(dd->dma_lch_in, &cfg); 449 if (ret) { 450 dev_err(dd->dev, "can't configure IN dmaengine slave: %d\n", 451 ret); 452 return ret; 453 } 454 455 tx_in = dmaengine_prep_slave_sg(dd->dma_lch_in, in_sg, in_sg_len, 456 DMA_MEM_TO_DEV, 457 DMA_PREP_INTERRUPT | DMA_CTRL_ACK); 458 if (!tx_in) { 459 dev_err(dd->dev, "IN prep_slave_sg() failed\n"); 460 return -EINVAL; 461 } 462 463 /* No callback necessary */ 464 tx_in->callback_param = dd; 465 466 /* OUT */ 467 ret = dmaengine_slave_config(dd->dma_lch_out, &cfg); 468 if (ret) { 469 dev_err(dd->dev, "can't configure OUT dmaengine slave: %d\n", 470 ret); 471 return ret; 472 } 473 474 tx_out = dmaengine_prep_slave_sg(dd->dma_lch_out, out_sg, out_sg_len, 475 DMA_DEV_TO_MEM, 476 DMA_PREP_INTERRUPT | DMA_CTRL_ACK); 477 if (!tx_out) { 478 dev_err(dd->dev, "OUT prep_slave_sg() failed\n"); 479 return -EINVAL; 480 } 481 482 tx_out->callback = omap_aes_dma_out_callback; 483 tx_out->callback_param = dd; 484 485 dmaengine_submit(tx_in); 486 dmaengine_submit(tx_out); 487 488 dma_async_issue_pending(dd->dma_lch_in); 489 dma_async_issue_pending(dd->dma_lch_out); 490 491 /* start DMA */ 492 dd->pdata->trigger(dd, dd->total); 493 494 return 0; 495 } 496 497 static int omap_aes_crypt_dma_start(struct omap_aes_dev *dd) 498 { 499 struct crypto_tfm *tfm = crypto_ablkcipher_tfm( 500 crypto_ablkcipher_reqtfm(dd->req)); 501 int err; 502 503 pr_debug("total: %d\n", dd->total); 504 505 if (!dd->pio_only) { 506 err = dma_map_sg(dd->dev, dd->in_sg, dd->in_sg_len, 507 DMA_TO_DEVICE); 508 if (!err) { 509 dev_err(dd->dev, "dma_map_sg() error\n"); 510 return -EINVAL; 511 } 512 513 err = dma_map_sg(dd->dev, dd->out_sg, dd->out_sg_len, 514 DMA_FROM_DEVICE); 515 if (!err) { 516 dev_err(dd->dev, "dma_map_sg() error\n"); 517 return -EINVAL; 518 } 519 } 520 521 err = omap_aes_crypt_dma(tfm, dd->in_sg, dd->out_sg, dd->in_sg_len, 522 dd->out_sg_len); 523 if (err && !dd->pio_only) { 524 dma_unmap_sg(dd->dev, dd->in_sg, dd->in_sg_len, DMA_TO_DEVICE); 525 dma_unmap_sg(dd->dev, dd->out_sg, dd->out_sg_len, 526 DMA_FROM_DEVICE); 527 } 528 529 return err; 530 } 531 532 static void omap_aes_finish_req(struct omap_aes_dev *dd, int err) 533 { 534 struct ablkcipher_request *req = dd->req; 535 536 pr_debug("err: %d\n", err); 537 538 dd->flags &= ~FLAGS_BUSY; 539 540 req->base.complete(&req->base, err); 541 } 542 543 static int omap_aes_crypt_dma_stop(struct omap_aes_dev *dd) 544 { 545 int err = 0; 546 547 pr_debug("total: %d\n", dd->total); 548 549 omap_aes_dma_stop(dd); 550 551 dmaengine_terminate_all(dd->dma_lch_in); 552 dmaengine_terminate_all(dd->dma_lch_out); 553 554 return err; 555 } 556 557 static int omap_aes_check_aligned(struct scatterlist *sg, int total) 558 { 559 int len = 0; 560 561 if (!IS_ALIGNED(total, AES_BLOCK_SIZE)) 562 return -EINVAL; 563 564 while (sg) { 565 if (!IS_ALIGNED(sg->offset, 4)) 566 return -1; 567 if (!IS_ALIGNED(sg->length, AES_BLOCK_SIZE)) 568 return -1; 569 570 len += sg->length; 571 sg = sg_next(sg); 572 } 573 574 if (len != total) 575 return -1; 576 577 return 0; 578 } 579 580 static int omap_aes_copy_sgs(struct omap_aes_dev *dd) 581 { 582 void *buf_in, *buf_out; 583 int pages, total; 584 585 total = ALIGN(dd->total, AES_BLOCK_SIZE); 586 pages = get_order(total); 587 588 buf_in = (void *)__get_free_pages(GFP_ATOMIC, pages); 589 buf_out = (void *)__get_free_pages(GFP_ATOMIC, pages); 590 591 if (!buf_in || !buf_out) { 592 pr_err("Couldn't allocated pages for unaligned cases.\n"); 593 return -1; 594 } 595 596 dd->orig_out = dd->out_sg; 597 598 sg_copy_buf(buf_in, dd->in_sg, 0, dd->total, 0); 599 600 sg_init_table(&dd->in_sgl, 1); 601 sg_set_buf(&dd->in_sgl, buf_in, total); 602 dd->in_sg = &dd->in_sgl; 603 604 sg_init_table(&dd->out_sgl, 1); 605 sg_set_buf(&dd->out_sgl, buf_out, total); 606 dd->out_sg = &dd->out_sgl; 607 608 return 0; 609 } 610 611 static int omap_aes_handle_queue(struct omap_aes_dev *dd, 612 struct ablkcipher_request *req) 613 { 614 struct crypto_async_request *async_req, *backlog; 615 struct omap_aes_ctx *ctx; 616 struct omap_aes_reqctx *rctx; 617 unsigned long flags; 618 int err, ret = 0, len; 619 620 spin_lock_irqsave(&dd->lock, flags); 621 if (req) 622 ret = ablkcipher_enqueue_request(&dd->queue, req); 623 if (dd->flags & FLAGS_BUSY) { 624 spin_unlock_irqrestore(&dd->lock, flags); 625 return ret; 626 } 627 backlog = crypto_get_backlog(&dd->queue); 628 async_req = crypto_dequeue_request(&dd->queue); 629 if (async_req) 630 dd->flags |= FLAGS_BUSY; 631 spin_unlock_irqrestore(&dd->lock, flags); 632 633 if (!async_req) 634 return ret; 635 636 if (backlog) 637 backlog->complete(backlog, -EINPROGRESS); 638 639 req = ablkcipher_request_cast(async_req); 640 641 /* assign new request to device */ 642 dd->req = req; 643 dd->total = req->nbytes; 644 dd->total_save = req->nbytes; 645 dd->in_sg = req->src; 646 dd->out_sg = req->dst; 647 648 if (omap_aes_check_aligned(dd->in_sg, dd->total) || 649 omap_aes_check_aligned(dd->out_sg, dd->total)) { 650 if (omap_aes_copy_sgs(dd)) 651 pr_err("Failed to copy SGs for unaligned cases\n"); 652 dd->sgs_copied = 1; 653 } else { 654 dd->sgs_copied = 0; 655 } 656 657 len = ALIGN(dd->total, AES_BLOCK_SIZE); 658 dd->in_sg_len = scatterwalk_bytes_sglen(dd->in_sg, len); 659 dd->out_sg_len = scatterwalk_bytes_sglen(dd->out_sg, len); 660 BUG_ON(dd->in_sg_len < 0 || dd->out_sg_len < 0); 661 662 rctx = ablkcipher_request_ctx(req); 663 ctx = crypto_ablkcipher_ctx(crypto_ablkcipher_reqtfm(req)); 664 rctx->mode &= FLAGS_MODE_MASK; 665 dd->flags = (dd->flags & ~FLAGS_MODE_MASK) | rctx->mode; 666 667 dd->ctx = ctx; 668 ctx->dd = dd; 669 670 err = omap_aes_write_ctrl(dd); 671 if (!err) 672 err = omap_aes_crypt_dma_start(dd); 673 if (err) { 674 /* aes_task will not finish it, so do it here */ 675 omap_aes_finish_req(dd, err); 676 tasklet_schedule(&dd->queue_task); 677 } 678 679 return ret; /* return ret, which is enqueue return value */ 680 } 681 682 static void omap_aes_done_task(unsigned long data) 683 { 684 struct omap_aes_dev *dd = (struct omap_aes_dev *)data; 685 void *buf_in, *buf_out; 686 int pages, len; 687 688 pr_debug("enter done_task\n"); 689 690 if (!dd->pio_only) { 691 dma_sync_sg_for_device(dd->dev, dd->out_sg, dd->out_sg_len, 692 DMA_FROM_DEVICE); 693 dma_unmap_sg(dd->dev, dd->in_sg, dd->in_sg_len, DMA_TO_DEVICE); 694 dma_unmap_sg(dd->dev, dd->out_sg, dd->out_sg_len, 695 DMA_FROM_DEVICE); 696 omap_aes_crypt_dma_stop(dd); 697 } 698 699 if (dd->sgs_copied) { 700 buf_in = sg_virt(&dd->in_sgl); 701 buf_out = sg_virt(&dd->out_sgl); 702 703 sg_copy_buf(buf_out, dd->orig_out, 0, dd->total_save, 1); 704 705 len = ALIGN(dd->total_save, AES_BLOCK_SIZE); 706 pages = get_order(len); 707 free_pages((unsigned long)buf_in, pages); 708 free_pages((unsigned long)buf_out, pages); 709 } 710 711 omap_aes_finish_req(dd, 0); 712 omap_aes_handle_queue(dd, NULL); 713 714 pr_debug("exit\n"); 715 } 716 717 static void omap_aes_queue_task(unsigned long data) 718 { 719 struct omap_aes_dev *dd = (struct omap_aes_dev *)data; 720 721 omap_aes_handle_queue(dd, NULL); 722 } 723 724 static int omap_aes_crypt(struct ablkcipher_request *req, unsigned long mode) 725 { 726 struct omap_aes_ctx *ctx = crypto_ablkcipher_ctx( 727 crypto_ablkcipher_reqtfm(req)); 728 struct omap_aes_reqctx *rctx = ablkcipher_request_ctx(req); 729 struct omap_aes_dev *dd; 730 731 pr_debug("nbytes: %d, enc: %d, cbc: %d\n", req->nbytes, 732 !!(mode & FLAGS_ENCRYPT), 733 !!(mode & FLAGS_CBC)); 734 735 dd = omap_aes_find_dev(ctx); 736 if (!dd) 737 return -ENODEV; 738 739 rctx->mode = mode; 740 741 return omap_aes_handle_queue(dd, req); 742 } 743 744 /* ********************** ALG API ************************************ */ 745 746 static int omap_aes_setkey(struct crypto_ablkcipher *tfm, const u8 *key, 747 unsigned int keylen) 748 { 749 struct omap_aes_ctx *ctx = crypto_ablkcipher_ctx(tfm); 750 751 if (keylen != AES_KEYSIZE_128 && keylen != AES_KEYSIZE_192 && 752 keylen != AES_KEYSIZE_256) 753 return -EINVAL; 754 755 pr_debug("enter, keylen: %d\n", keylen); 756 757 memcpy(ctx->key, key, keylen); 758 ctx->keylen = keylen; 759 760 return 0; 761 } 762 763 static int omap_aes_ecb_encrypt(struct ablkcipher_request *req) 764 { 765 return omap_aes_crypt(req, FLAGS_ENCRYPT); 766 } 767 768 static int omap_aes_ecb_decrypt(struct ablkcipher_request *req) 769 { 770 return omap_aes_crypt(req, 0); 771 } 772 773 static int omap_aes_cbc_encrypt(struct ablkcipher_request *req) 774 { 775 return omap_aes_crypt(req, FLAGS_ENCRYPT | FLAGS_CBC); 776 } 777 778 static int omap_aes_cbc_decrypt(struct ablkcipher_request *req) 779 { 780 return omap_aes_crypt(req, FLAGS_CBC); 781 } 782 783 static int omap_aes_ctr_encrypt(struct ablkcipher_request *req) 784 { 785 return omap_aes_crypt(req, FLAGS_ENCRYPT | FLAGS_CTR); 786 } 787 788 static int omap_aes_ctr_decrypt(struct ablkcipher_request *req) 789 { 790 return omap_aes_crypt(req, FLAGS_CTR); 791 } 792 793 static int omap_aes_cra_init(struct crypto_tfm *tfm) 794 { 795 struct omap_aes_dev *dd = NULL; 796 int err; 797 798 /* Find AES device, currently picks the first device */ 799 spin_lock_bh(&list_lock); 800 list_for_each_entry(dd, &dev_list, list) { 801 break; 802 } 803 spin_unlock_bh(&list_lock); 804 805 err = pm_runtime_get_sync(dd->dev); 806 if (err < 0) { 807 dev_err(dd->dev, "%s: failed to get_sync(%d)\n", 808 __func__, err); 809 return err; 810 } 811 812 tfm->crt_ablkcipher.reqsize = sizeof(struct omap_aes_reqctx); 813 814 return 0; 815 } 816 817 static void omap_aes_cra_exit(struct crypto_tfm *tfm) 818 { 819 struct omap_aes_dev *dd = NULL; 820 821 /* Find AES device, currently picks the first device */ 822 spin_lock_bh(&list_lock); 823 list_for_each_entry(dd, &dev_list, list) { 824 break; 825 } 826 spin_unlock_bh(&list_lock); 827 828 pm_runtime_put_sync(dd->dev); 829 } 830 831 /* ********************** ALGS ************************************ */ 832 833 static struct crypto_alg algs_ecb_cbc[] = { 834 { 835 .cra_name = "ecb(aes)", 836 .cra_driver_name = "ecb-aes-omap", 837 .cra_priority = 300, 838 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | 839 CRYPTO_ALG_KERN_DRIVER_ONLY | 840 CRYPTO_ALG_ASYNC, 841 .cra_blocksize = AES_BLOCK_SIZE, 842 .cra_ctxsize = sizeof(struct omap_aes_ctx), 843 .cra_alignmask = 0, 844 .cra_type = &crypto_ablkcipher_type, 845 .cra_module = THIS_MODULE, 846 .cra_init = omap_aes_cra_init, 847 .cra_exit = omap_aes_cra_exit, 848 .cra_u.ablkcipher = { 849 .min_keysize = AES_MIN_KEY_SIZE, 850 .max_keysize = AES_MAX_KEY_SIZE, 851 .setkey = omap_aes_setkey, 852 .encrypt = omap_aes_ecb_encrypt, 853 .decrypt = omap_aes_ecb_decrypt, 854 } 855 }, 856 { 857 .cra_name = "cbc(aes)", 858 .cra_driver_name = "cbc-aes-omap", 859 .cra_priority = 300, 860 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | 861 CRYPTO_ALG_KERN_DRIVER_ONLY | 862 CRYPTO_ALG_ASYNC, 863 .cra_blocksize = AES_BLOCK_SIZE, 864 .cra_ctxsize = sizeof(struct omap_aes_ctx), 865 .cra_alignmask = 0, 866 .cra_type = &crypto_ablkcipher_type, 867 .cra_module = THIS_MODULE, 868 .cra_init = omap_aes_cra_init, 869 .cra_exit = omap_aes_cra_exit, 870 .cra_u.ablkcipher = { 871 .min_keysize = AES_MIN_KEY_SIZE, 872 .max_keysize = AES_MAX_KEY_SIZE, 873 .ivsize = AES_BLOCK_SIZE, 874 .setkey = omap_aes_setkey, 875 .encrypt = omap_aes_cbc_encrypt, 876 .decrypt = omap_aes_cbc_decrypt, 877 } 878 } 879 }; 880 881 static struct crypto_alg algs_ctr[] = { 882 { 883 .cra_name = "ctr(aes)", 884 .cra_driver_name = "ctr-aes-omap", 885 .cra_priority = 300, 886 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | 887 CRYPTO_ALG_KERN_DRIVER_ONLY | 888 CRYPTO_ALG_ASYNC, 889 .cra_blocksize = AES_BLOCK_SIZE, 890 .cra_ctxsize = sizeof(struct omap_aes_ctx), 891 .cra_alignmask = 0, 892 .cra_type = &crypto_ablkcipher_type, 893 .cra_module = THIS_MODULE, 894 .cra_init = omap_aes_cra_init, 895 .cra_exit = omap_aes_cra_exit, 896 .cra_u.ablkcipher = { 897 .min_keysize = AES_MIN_KEY_SIZE, 898 .max_keysize = AES_MAX_KEY_SIZE, 899 .geniv = "eseqiv", 900 .ivsize = AES_BLOCK_SIZE, 901 .setkey = omap_aes_setkey, 902 .encrypt = omap_aes_ctr_encrypt, 903 .decrypt = omap_aes_ctr_decrypt, 904 } 905 } , 906 }; 907 908 static struct omap_aes_algs_info omap_aes_algs_info_ecb_cbc[] = { 909 { 910 .algs_list = algs_ecb_cbc, 911 .size = ARRAY_SIZE(algs_ecb_cbc), 912 }, 913 }; 914 915 static const struct omap_aes_pdata omap_aes_pdata_omap2 = { 916 .algs_info = omap_aes_algs_info_ecb_cbc, 917 .algs_info_size = ARRAY_SIZE(omap_aes_algs_info_ecb_cbc), 918 .trigger = omap_aes_dma_trigger_omap2, 919 .key_ofs = 0x1c, 920 .iv_ofs = 0x20, 921 .ctrl_ofs = 0x30, 922 .data_ofs = 0x34, 923 .rev_ofs = 0x44, 924 .mask_ofs = 0x48, 925 .dma_enable_in = BIT(2), 926 .dma_enable_out = BIT(3), 927 .dma_start = BIT(5), 928 .major_mask = 0xf0, 929 .major_shift = 4, 930 .minor_mask = 0x0f, 931 .minor_shift = 0, 932 }; 933 934 #ifdef CONFIG_OF 935 static struct omap_aes_algs_info omap_aes_algs_info_ecb_cbc_ctr[] = { 936 { 937 .algs_list = algs_ecb_cbc, 938 .size = ARRAY_SIZE(algs_ecb_cbc), 939 }, 940 { 941 .algs_list = algs_ctr, 942 .size = ARRAY_SIZE(algs_ctr), 943 }, 944 }; 945 946 static const struct omap_aes_pdata omap_aes_pdata_omap3 = { 947 .algs_info = omap_aes_algs_info_ecb_cbc_ctr, 948 .algs_info_size = ARRAY_SIZE(omap_aes_algs_info_ecb_cbc_ctr), 949 .trigger = omap_aes_dma_trigger_omap2, 950 .key_ofs = 0x1c, 951 .iv_ofs = 0x20, 952 .ctrl_ofs = 0x30, 953 .data_ofs = 0x34, 954 .rev_ofs = 0x44, 955 .mask_ofs = 0x48, 956 .dma_enable_in = BIT(2), 957 .dma_enable_out = BIT(3), 958 .dma_start = BIT(5), 959 .major_mask = 0xf0, 960 .major_shift = 4, 961 .minor_mask = 0x0f, 962 .minor_shift = 0, 963 }; 964 965 static const struct omap_aes_pdata omap_aes_pdata_omap4 = { 966 .algs_info = omap_aes_algs_info_ecb_cbc_ctr, 967 .algs_info_size = ARRAY_SIZE(omap_aes_algs_info_ecb_cbc_ctr), 968 .trigger = omap_aes_dma_trigger_omap4, 969 .key_ofs = 0x3c, 970 .iv_ofs = 0x40, 971 .ctrl_ofs = 0x50, 972 .data_ofs = 0x60, 973 .rev_ofs = 0x80, 974 .mask_ofs = 0x84, 975 .irq_status_ofs = 0x8c, 976 .irq_enable_ofs = 0x90, 977 .dma_enable_in = BIT(5), 978 .dma_enable_out = BIT(6), 979 .major_mask = 0x0700, 980 .major_shift = 8, 981 .minor_mask = 0x003f, 982 .minor_shift = 0, 983 }; 984 985 static irqreturn_t omap_aes_irq(int irq, void *dev_id) 986 { 987 struct omap_aes_dev *dd = dev_id; 988 u32 status, i; 989 u32 *src, *dst; 990 991 status = omap_aes_read(dd, AES_REG_IRQ_STATUS(dd)); 992 if (status & AES_REG_IRQ_DATA_IN) { 993 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x0); 994 995 BUG_ON(!dd->in_sg); 996 997 BUG_ON(_calc_walked(in) > dd->in_sg->length); 998 999 src = sg_virt(dd->in_sg) + _calc_walked(in); 1000 1001 for (i = 0; i < AES_BLOCK_WORDS; i++) { 1002 omap_aes_write(dd, AES_REG_DATA_N(dd, i), *src); 1003 1004 scatterwalk_advance(&dd->in_walk, 4); 1005 if (dd->in_sg->length == _calc_walked(in)) { 1006 dd->in_sg = sg_next(dd->in_sg); 1007 if (dd->in_sg) { 1008 scatterwalk_start(&dd->in_walk, 1009 dd->in_sg); 1010 src = sg_virt(dd->in_sg) + 1011 _calc_walked(in); 1012 } 1013 } else { 1014 src++; 1015 } 1016 } 1017 1018 /* Clear IRQ status */ 1019 status &= ~AES_REG_IRQ_DATA_IN; 1020 omap_aes_write(dd, AES_REG_IRQ_STATUS(dd), status); 1021 1022 /* Enable DATA_OUT interrupt */ 1023 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x4); 1024 1025 } else if (status & AES_REG_IRQ_DATA_OUT) { 1026 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x0); 1027 1028 BUG_ON(!dd->out_sg); 1029 1030 BUG_ON(_calc_walked(out) > dd->out_sg->length); 1031 1032 dst = sg_virt(dd->out_sg) + _calc_walked(out); 1033 1034 for (i = 0; i < AES_BLOCK_WORDS; i++) { 1035 *dst = omap_aes_read(dd, AES_REG_DATA_N(dd, i)); 1036 scatterwalk_advance(&dd->out_walk, 4); 1037 if (dd->out_sg->length == _calc_walked(out)) { 1038 dd->out_sg = sg_next(dd->out_sg); 1039 if (dd->out_sg) { 1040 scatterwalk_start(&dd->out_walk, 1041 dd->out_sg); 1042 dst = sg_virt(dd->out_sg) + 1043 _calc_walked(out); 1044 } 1045 } else { 1046 dst++; 1047 } 1048 } 1049 1050 dd->total -= min_t(size_t, AES_BLOCK_SIZE, dd->total); 1051 1052 /* Clear IRQ status */ 1053 status &= ~AES_REG_IRQ_DATA_OUT; 1054 omap_aes_write(dd, AES_REG_IRQ_STATUS(dd), status); 1055 1056 if (!dd->total) 1057 /* All bytes read! */ 1058 tasklet_schedule(&dd->done_task); 1059 else 1060 /* Enable DATA_IN interrupt for next block */ 1061 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x2); 1062 } 1063 1064 return IRQ_HANDLED; 1065 } 1066 1067 static const struct of_device_id omap_aes_of_match[] = { 1068 { 1069 .compatible = "ti,omap2-aes", 1070 .data = &omap_aes_pdata_omap2, 1071 }, 1072 { 1073 .compatible = "ti,omap3-aes", 1074 .data = &omap_aes_pdata_omap3, 1075 }, 1076 { 1077 .compatible = "ti,omap4-aes", 1078 .data = &omap_aes_pdata_omap4, 1079 }, 1080 {}, 1081 }; 1082 MODULE_DEVICE_TABLE(of, omap_aes_of_match); 1083 1084 static int omap_aes_get_res_of(struct omap_aes_dev *dd, 1085 struct device *dev, struct resource *res) 1086 { 1087 struct device_node *node = dev->of_node; 1088 const struct of_device_id *match; 1089 int err = 0; 1090 1091 match = of_match_device(of_match_ptr(omap_aes_of_match), dev); 1092 if (!match) { 1093 dev_err(dev, "no compatible OF match\n"); 1094 err = -EINVAL; 1095 goto err; 1096 } 1097 1098 err = of_address_to_resource(node, 0, res); 1099 if (err < 0) { 1100 dev_err(dev, "can't translate OF node address\n"); 1101 err = -EINVAL; 1102 goto err; 1103 } 1104 1105 dd->dma_out = -1; /* Dummy value that's unused */ 1106 dd->dma_in = -1; /* Dummy value that's unused */ 1107 1108 dd->pdata = match->data; 1109 1110 err: 1111 return err; 1112 } 1113 #else 1114 static const struct of_device_id omap_aes_of_match[] = { 1115 {}, 1116 }; 1117 1118 static int omap_aes_get_res_of(struct omap_aes_dev *dd, 1119 struct device *dev, struct resource *res) 1120 { 1121 return -EINVAL; 1122 } 1123 #endif 1124 1125 static int omap_aes_get_res_pdev(struct omap_aes_dev *dd, 1126 struct platform_device *pdev, struct resource *res) 1127 { 1128 struct device *dev = &pdev->dev; 1129 struct resource *r; 1130 int err = 0; 1131 1132 /* Get the base address */ 1133 r = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1134 if (!r) { 1135 dev_err(dev, "no MEM resource info\n"); 1136 err = -ENODEV; 1137 goto err; 1138 } 1139 memcpy(res, r, sizeof(*res)); 1140 1141 /* Get the DMA out channel */ 1142 r = platform_get_resource(pdev, IORESOURCE_DMA, 0); 1143 if (!r) { 1144 dev_err(dev, "no DMA out resource info\n"); 1145 err = -ENODEV; 1146 goto err; 1147 } 1148 dd->dma_out = r->start; 1149 1150 /* Get the DMA in channel */ 1151 r = platform_get_resource(pdev, IORESOURCE_DMA, 1); 1152 if (!r) { 1153 dev_err(dev, "no DMA in resource info\n"); 1154 err = -ENODEV; 1155 goto err; 1156 } 1157 dd->dma_in = r->start; 1158 1159 /* Only OMAP2/3 can be non-DT */ 1160 dd->pdata = &omap_aes_pdata_omap2; 1161 1162 err: 1163 return err; 1164 } 1165 1166 static int omap_aes_probe(struct platform_device *pdev) 1167 { 1168 struct device *dev = &pdev->dev; 1169 struct omap_aes_dev *dd; 1170 struct crypto_alg *algp; 1171 struct resource res; 1172 int err = -ENOMEM, i, j, irq = -1; 1173 u32 reg; 1174 1175 dd = devm_kzalloc(dev, sizeof(struct omap_aes_dev), GFP_KERNEL); 1176 if (dd == NULL) { 1177 dev_err(dev, "unable to alloc data struct.\n"); 1178 goto err_data; 1179 } 1180 dd->dev = dev; 1181 platform_set_drvdata(pdev, dd); 1182 1183 spin_lock_init(&dd->lock); 1184 crypto_init_queue(&dd->queue, OMAP_AES_QUEUE_LENGTH); 1185 1186 err = (dev->of_node) ? omap_aes_get_res_of(dd, dev, &res) : 1187 omap_aes_get_res_pdev(dd, pdev, &res); 1188 if (err) 1189 goto err_res; 1190 1191 dd->io_base = devm_ioremap_resource(dev, &res); 1192 if (IS_ERR(dd->io_base)) { 1193 err = PTR_ERR(dd->io_base); 1194 goto err_res; 1195 } 1196 dd->phys_base = res.start; 1197 1198 pm_runtime_enable(dev); 1199 err = pm_runtime_get_sync(dev); 1200 if (err < 0) { 1201 dev_err(dev, "%s: failed to get_sync(%d)\n", 1202 __func__, err); 1203 goto err_res; 1204 } 1205 1206 omap_aes_dma_stop(dd); 1207 1208 reg = omap_aes_read(dd, AES_REG_REV(dd)); 1209 1210 pm_runtime_put_sync(dev); 1211 1212 dev_info(dev, "OMAP AES hw accel rev: %u.%u\n", 1213 (reg & dd->pdata->major_mask) >> dd->pdata->major_shift, 1214 (reg & dd->pdata->minor_mask) >> dd->pdata->minor_shift); 1215 1216 tasklet_init(&dd->done_task, omap_aes_done_task, (unsigned long)dd); 1217 tasklet_init(&dd->queue_task, omap_aes_queue_task, (unsigned long)dd); 1218 1219 err = omap_aes_dma_init(dd); 1220 if (err && AES_REG_IRQ_STATUS(dd) && AES_REG_IRQ_ENABLE(dd)) { 1221 dd->pio_only = 1; 1222 1223 irq = platform_get_irq(pdev, 0); 1224 if (irq < 0) { 1225 dev_err(dev, "can't get IRQ resource\n"); 1226 goto err_irq; 1227 } 1228 1229 err = devm_request_irq(dev, irq, omap_aes_irq, 0, 1230 dev_name(dev), dd); 1231 if (err) { 1232 dev_err(dev, "Unable to grab omap-aes IRQ\n"); 1233 goto err_irq; 1234 } 1235 } 1236 1237 1238 INIT_LIST_HEAD(&dd->list); 1239 spin_lock(&list_lock); 1240 list_add_tail(&dd->list, &dev_list); 1241 spin_unlock(&list_lock); 1242 1243 for (i = 0; i < dd->pdata->algs_info_size; i++) { 1244 for (j = 0; j < dd->pdata->algs_info[i].size; j++) { 1245 algp = &dd->pdata->algs_info[i].algs_list[j]; 1246 1247 pr_debug("reg alg: %s\n", algp->cra_name); 1248 INIT_LIST_HEAD(&algp->cra_list); 1249 1250 err = crypto_register_alg(algp); 1251 if (err) 1252 goto err_algs; 1253 1254 dd->pdata->algs_info[i].registered++; 1255 } 1256 } 1257 1258 return 0; 1259 err_algs: 1260 for (i = dd->pdata->algs_info_size - 1; i >= 0; i--) 1261 for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--) 1262 crypto_unregister_alg( 1263 &dd->pdata->algs_info[i].algs_list[j]); 1264 if (!dd->pio_only) 1265 omap_aes_dma_cleanup(dd); 1266 err_irq: 1267 tasklet_kill(&dd->done_task); 1268 tasklet_kill(&dd->queue_task); 1269 pm_runtime_disable(dev); 1270 err_res: 1271 dd = NULL; 1272 err_data: 1273 dev_err(dev, "initialization failed.\n"); 1274 return err; 1275 } 1276 1277 static int omap_aes_remove(struct platform_device *pdev) 1278 { 1279 struct omap_aes_dev *dd = platform_get_drvdata(pdev); 1280 int i, j; 1281 1282 if (!dd) 1283 return -ENODEV; 1284 1285 spin_lock(&list_lock); 1286 list_del(&dd->list); 1287 spin_unlock(&list_lock); 1288 1289 for (i = dd->pdata->algs_info_size - 1; i >= 0; i--) 1290 for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--) 1291 crypto_unregister_alg( 1292 &dd->pdata->algs_info[i].algs_list[j]); 1293 1294 tasklet_kill(&dd->done_task); 1295 tasklet_kill(&dd->queue_task); 1296 omap_aes_dma_cleanup(dd); 1297 pm_runtime_disable(dd->dev); 1298 dd = NULL; 1299 1300 return 0; 1301 } 1302 1303 #ifdef CONFIG_PM_SLEEP 1304 static int omap_aes_suspend(struct device *dev) 1305 { 1306 pm_runtime_put_sync(dev); 1307 return 0; 1308 } 1309 1310 static int omap_aes_resume(struct device *dev) 1311 { 1312 pm_runtime_get_sync(dev); 1313 return 0; 1314 } 1315 #endif 1316 1317 static SIMPLE_DEV_PM_OPS(omap_aes_pm_ops, omap_aes_suspend, omap_aes_resume); 1318 1319 static struct platform_driver omap_aes_driver = { 1320 .probe = omap_aes_probe, 1321 .remove = omap_aes_remove, 1322 .driver = { 1323 .name = "omap-aes", 1324 .pm = &omap_aes_pm_ops, 1325 .of_match_table = omap_aes_of_match, 1326 }, 1327 }; 1328 1329 module_platform_driver(omap_aes_driver); 1330 1331 MODULE_DESCRIPTION("OMAP AES hw acceleration support."); 1332 MODULE_LICENSE("GPL v2"); 1333 MODULE_AUTHOR("Dmitry Kasatkin"); 1334 1335