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