1 /* 2 * Cryptographic API. 3 * 4 * Support for OMAP SHA1/MD5 HW acceleration. 5 * 6 * Copyright (c) 2010 Nokia Corporation 7 * Author: Dmitry Kasatkin <dmitry.kasatkin@nokia.com> 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 as published 11 * by the Free Software Foundation. 12 * 13 * Some ideas are from old omap-sha1-md5.c driver. 14 */ 15 16 #define pr_fmt(fmt) "%s: " fmt, __func__ 17 18 #include <linux/err.h> 19 #include <linux/device.h> 20 #include <linux/module.h> 21 #include <linux/init.h> 22 #include <linux/errno.h> 23 #include <linux/interrupt.h> 24 #include <linux/kernel.h> 25 #include <linux/clk.h> 26 #include <linux/irq.h> 27 #include <linux/io.h> 28 #include <linux/platform_device.h> 29 #include <linux/scatterlist.h> 30 #include <linux/dma-mapping.h> 31 #include <linux/delay.h> 32 #include <linux/crypto.h> 33 #include <linux/cryptohash.h> 34 #include <crypto/scatterwalk.h> 35 #include <crypto/algapi.h> 36 #include <crypto/sha.h> 37 #include <crypto/hash.h> 38 #include <crypto/internal/hash.h> 39 40 #include <plat/cpu.h> 41 #include <plat/dma.h> 42 #include <mach/irqs.h> 43 44 #define SHA_REG_DIGEST(x) (0x00 + ((x) * 0x04)) 45 #define SHA_REG_DIN(x) (0x1C + ((x) * 0x04)) 46 47 #define SHA1_MD5_BLOCK_SIZE SHA1_BLOCK_SIZE 48 #define MD5_DIGEST_SIZE 16 49 50 #define SHA_REG_DIGCNT 0x14 51 52 #define SHA_REG_CTRL 0x18 53 #define SHA_REG_CTRL_LENGTH (0xFFFFFFFF << 5) 54 #define SHA_REG_CTRL_CLOSE_HASH (1 << 4) 55 #define SHA_REG_CTRL_ALGO_CONST (1 << 3) 56 #define SHA_REG_CTRL_ALGO (1 << 2) 57 #define SHA_REG_CTRL_INPUT_READY (1 << 1) 58 #define SHA_REG_CTRL_OUTPUT_READY (1 << 0) 59 60 #define SHA_REG_REV 0x5C 61 #define SHA_REG_REV_MAJOR 0xF0 62 #define SHA_REG_REV_MINOR 0x0F 63 64 #define SHA_REG_MASK 0x60 65 #define SHA_REG_MASK_DMA_EN (1 << 3) 66 #define SHA_REG_MASK_IT_EN (1 << 2) 67 #define SHA_REG_MASK_SOFTRESET (1 << 1) 68 #define SHA_REG_AUTOIDLE (1 << 0) 69 70 #define SHA_REG_SYSSTATUS 0x64 71 #define SHA_REG_SYSSTATUS_RESETDONE (1 << 0) 72 73 #define DEFAULT_TIMEOUT_INTERVAL HZ 74 75 #define FLAGS_FIRST 0x0001 76 #define FLAGS_FINUP 0x0002 77 #define FLAGS_FINAL 0x0004 78 #define FLAGS_FAST 0x0008 79 #define FLAGS_SHA1 0x0010 80 #define FLAGS_DMA_ACTIVE 0x0020 81 #define FLAGS_OUTPUT_READY 0x0040 82 #define FLAGS_CLEAN 0x0080 83 #define FLAGS_INIT 0x0100 84 #define FLAGS_CPU 0x0200 85 #define FLAGS_HMAC 0x0400 86 87 /* 3rd byte */ 88 #define FLAGS_BUSY 16 89 90 #define OP_UPDATE 1 91 #define OP_FINAL 2 92 93 struct omap_sham_dev; 94 95 struct omap_sham_reqctx { 96 struct omap_sham_dev *dd; 97 unsigned long flags; 98 unsigned long op; 99 100 size_t digcnt; 101 u8 *buffer; 102 size_t bufcnt; 103 size_t buflen; 104 dma_addr_t dma_addr; 105 106 /* walk state */ 107 struct scatterlist *sg; 108 unsigned int offset; /* offset in current sg */ 109 unsigned int total; /* total request */ 110 }; 111 112 struct omap_sham_hmac_ctx { 113 struct crypto_shash *shash; 114 u8 ipad[SHA1_MD5_BLOCK_SIZE]; 115 u8 opad[SHA1_MD5_BLOCK_SIZE]; 116 }; 117 118 struct omap_sham_ctx { 119 struct omap_sham_dev *dd; 120 121 unsigned long flags; 122 123 /* fallback stuff */ 124 struct crypto_shash *fallback; 125 126 struct omap_sham_hmac_ctx base[0]; 127 }; 128 129 #define OMAP_SHAM_QUEUE_LENGTH 1 130 131 struct omap_sham_dev { 132 struct list_head list; 133 unsigned long phys_base; 134 struct device *dev; 135 void __iomem *io_base; 136 int irq; 137 struct clk *iclk; 138 spinlock_t lock; 139 int dma; 140 int dma_lch; 141 struct tasklet_struct done_task; 142 struct tasklet_struct queue_task; 143 144 unsigned long flags; 145 struct crypto_queue queue; 146 struct ahash_request *req; 147 }; 148 149 struct omap_sham_drv { 150 struct list_head dev_list; 151 spinlock_t lock; 152 unsigned long flags; 153 }; 154 155 static struct omap_sham_drv sham = { 156 .dev_list = LIST_HEAD_INIT(sham.dev_list), 157 .lock = __SPIN_LOCK_UNLOCKED(sham.lock), 158 }; 159 160 static inline u32 omap_sham_read(struct omap_sham_dev *dd, u32 offset) 161 { 162 return __raw_readl(dd->io_base + offset); 163 } 164 165 static inline void omap_sham_write(struct omap_sham_dev *dd, 166 u32 offset, u32 value) 167 { 168 __raw_writel(value, dd->io_base + offset); 169 } 170 171 static inline void omap_sham_write_mask(struct omap_sham_dev *dd, u32 address, 172 u32 value, u32 mask) 173 { 174 u32 val; 175 176 val = omap_sham_read(dd, address); 177 val &= ~mask; 178 val |= value; 179 omap_sham_write(dd, address, val); 180 } 181 182 static inline int omap_sham_wait(struct omap_sham_dev *dd, u32 offset, u32 bit) 183 { 184 unsigned long timeout = jiffies + DEFAULT_TIMEOUT_INTERVAL; 185 186 while (!(omap_sham_read(dd, offset) & bit)) { 187 if (time_is_before_jiffies(timeout)) 188 return -ETIMEDOUT; 189 } 190 191 return 0; 192 } 193 194 static void omap_sham_copy_hash(struct ahash_request *req, int out) 195 { 196 struct omap_sham_reqctx *ctx = ahash_request_ctx(req); 197 u32 *hash = (u32 *)req->result; 198 int i; 199 200 if (likely(ctx->flags & FLAGS_SHA1)) { 201 /* SHA1 results are in big endian */ 202 for (i = 0; i < SHA1_DIGEST_SIZE / sizeof(u32); i++) 203 if (out) 204 hash[i] = be32_to_cpu(omap_sham_read(ctx->dd, 205 SHA_REG_DIGEST(i))); 206 else 207 omap_sham_write(ctx->dd, SHA_REG_DIGEST(i), 208 cpu_to_be32(hash[i])); 209 } else { 210 /* MD5 results are in little endian */ 211 for (i = 0; i < MD5_DIGEST_SIZE / sizeof(u32); i++) 212 if (out) 213 hash[i] = le32_to_cpu(omap_sham_read(ctx->dd, 214 SHA_REG_DIGEST(i))); 215 else 216 omap_sham_write(ctx->dd, SHA_REG_DIGEST(i), 217 cpu_to_le32(hash[i])); 218 } 219 } 220 221 static int omap_sham_write_ctrl(struct omap_sham_dev *dd, size_t length, 222 int final, int dma) 223 { 224 struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req); 225 u32 val = length << 5, mask; 226 227 if (unlikely(!ctx->digcnt)) { 228 229 clk_enable(dd->iclk); 230 231 if (!(dd->flags & FLAGS_INIT)) { 232 omap_sham_write_mask(dd, SHA_REG_MASK, 233 SHA_REG_MASK_SOFTRESET, SHA_REG_MASK_SOFTRESET); 234 235 if (omap_sham_wait(dd, SHA_REG_SYSSTATUS, 236 SHA_REG_SYSSTATUS_RESETDONE)) 237 return -ETIMEDOUT; 238 239 dd->flags |= FLAGS_INIT; 240 } 241 } else { 242 omap_sham_write(dd, SHA_REG_DIGCNT, ctx->digcnt); 243 } 244 245 omap_sham_write_mask(dd, SHA_REG_MASK, 246 SHA_REG_MASK_IT_EN | (dma ? SHA_REG_MASK_DMA_EN : 0), 247 SHA_REG_MASK_IT_EN | SHA_REG_MASK_DMA_EN); 248 /* 249 * Setting ALGO_CONST only for the first iteration 250 * and CLOSE_HASH only for the last one. 251 */ 252 if (ctx->flags & FLAGS_SHA1) 253 val |= SHA_REG_CTRL_ALGO; 254 if (!ctx->digcnt) 255 val |= SHA_REG_CTRL_ALGO_CONST; 256 if (final) 257 val |= SHA_REG_CTRL_CLOSE_HASH; 258 259 mask = SHA_REG_CTRL_ALGO_CONST | SHA_REG_CTRL_CLOSE_HASH | 260 SHA_REG_CTRL_ALGO | SHA_REG_CTRL_LENGTH; 261 262 omap_sham_write_mask(dd, SHA_REG_CTRL, val, mask); 263 264 return 0; 265 } 266 267 static int omap_sham_xmit_cpu(struct omap_sham_dev *dd, const u8 *buf, 268 size_t length, int final) 269 { 270 struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req); 271 int err, count, len32; 272 const u32 *buffer = (const u32 *)buf; 273 274 dev_dbg(dd->dev, "xmit_cpu: digcnt: %d, length: %d, final: %d\n", 275 ctx->digcnt, length, final); 276 277 err = omap_sham_write_ctrl(dd, length, final, 0); 278 if (err) 279 return err; 280 281 if (omap_sham_wait(dd, SHA_REG_CTRL, SHA_REG_CTRL_INPUT_READY)) 282 return -ETIMEDOUT; 283 284 ctx->digcnt += length; 285 286 if (final) 287 ctx->flags |= FLAGS_FINAL; /* catch last interrupt */ 288 289 len32 = DIV_ROUND_UP(length, sizeof(u32)); 290 291 for (count = 0; count < len32; count++) 292 omap_sham_write(dd, SHA_REG_DIN(count), buffer[count]); 293 294 return -EINPROGRESS; 295 } 296 297 static int omap_sham_xmit_dma(struct omap_sham_dev *dd, dma_addr_t dma_addr, 298 size_t length, int final) 299 { 300 struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req); 301 int err, len32; 302 303 dev_dbg(dd->dev, "xmit_dma: digcnt: %d, length: %d, final: %d\n", 304 ctx->digcnt, length, final); 305 306 /* flush cache entries related to our page */ 307 if (dma_addr == ctx->dma_addr) 308 dma_sync_single_for_device(dd->dev, dma_addr, length, 309 DMA_TO_DEVICE); 310 311 len32 = DIV_ROUND_UP(length, sizeof(u32)); 312 313 omap_set_dma_transfer_params(dd->dma_lch, OMAP_DMA_DATA_TYPE_S32, len32, 314 1, OMAP_DMA_SYNC_PACKET, dd->dma, OMAP_DMA_DST_SYNC); 315 316 omap_set_dma_src_params(dd->dma_lch, 0, OMAP_DMA_AMODE_POST_INC, 317 dma_addr, 0, 0); 318 319 err = omap_sham_write_ctrl(dd, length, final, 1); 320 if (err) 321 return err; 322 323 ctx->digcnt += length; 324 325 if (final) 326 ctx->flags |= FLAGS_FINAL; /* catch last interrupt */ 327 328 dd->flags |= FLAGS_DMA_ACTIVE; 329 330 omap_start_dma(dd->dma_lch); 331 332 return -EINPROGRESS; 333 } 334 335 static size_t omap_sham_append_buffer(struct omap_sham_reqctx *ctx, 336 const u8 *data, size_t length) 337 { 338 size_t count = min(length, ctx->buflen - ctx->bufcnt); 339 340 count = min(count, ctx->total); 341 if (count <= 0) 342 return 0; 343 memcpy(ctx->buffer + ctx->bufcnt, data, count); 344 ctx->bufcnt += count; 345 346 return count; 347 } 348 349 static size_t omap_sham_append_sg(struct omap_sham_reqctx *ctx) 350 { 351 size_t count; 352 353 while (ctx->sg) { 354 count = omap_sham_append_buffer(ctx, 355 sg_virt(ctx->sg) + ctx->offset, 356 ctx->sg->length - ctx->offset); 357 if (!count) 358 break; 359 ctx->offset += count; 360 ctx->total -= count; 361 if (ctx->offset == ctx->sg->length) { 362 ctx->sg = sg_next(ctx->sg); 363 if (ctx->sg) 364 ctx->offset = 0; 365 else 366 ctx->total = 0; 367 } 368 } 369 370 return 0; 371 } 372 373 static int omap_sham_update_dma_slow(struct omap_sham_dev *dd) 374 { 375 struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req); 376 unsigned int final; 377 size_t count; 378 379 if (!ctx->total) 380 return 0; 381 382 omap_sham_append_sg(ctx); 383 384 final = (ctx->flags & FLAGS_FINUP) && !ctx->total; 385 386 dev_dbg(dd->dev, "slow: bufcnt: %u, digcnt: %d, final: %d\n", 387 ctx->bufcnt, ctx->digcnt, final); 388 389 if (final || (ctx->bufcnt == ctx->buflen && ctx->total)) { 390 count = ctx->bufcnt; 391 ctx->bufcnt = 0; 392 return omap_sham_xmit_dma(dd, ctx->dma_addr, count, final); 393 } 394 395 return 0; 396 } 397 398 static int omap_sham_update_dma_fast(struct omap_sham_dev *dd) 399 { 400 struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req); 401 unsigned int length; 402 403 ctx->flags |= FLAGS_FAST; 404 405 length = min(ctx->total, sg_dma_len(ctx->sg)); 406 ctx->total = length; 407 408 if (!dma_map_sg(dd->dev, ctx->sg, 1, DMA_TO_DEVICE)) { 409 dev_err(dd->dev, "dma_map_sg error\n"); 410 return -EINVAL; 411 } 412 413 ctx->total -= length; 414 415 return omap_sham_xmit_dma(dd, sg_dma_address(ctx->sg), length, 1); 416 } 417 418 static int omap_sham_update_cpu(struct omap_sham_dev *dd) 419 { 420 struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req); 421 int bufcnt; 422 423 omap_sham_append_sg(ctx); 424 bufcnt = ctx->bufcnt; 425 ctx->bufcnt = 0; 426 427 return omap_sham_xmit_cpu(dd, ctx->buffer, bufcnt, 1); 428 } 429 430 static int omap_sham_update_dma_stop(struct omap_sham_dev *dd) 431 { 432 struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req); 433 434 omap_stop_dma(dd->dma_lch); 435 if (ctx->flags & FLAGS_FAST) 436 dma_unmap_sg(dd->dev, ctx->sg, 1, DMA_TO_DEVICE); 437 438 return 0; 439 } 440 441 static void omap_sham_cleanup(struct ahash_request *req) 442 { 443 struct omap_sham_reqctx *ctx = ahash_request_ctx(req); 444 struct omap_sham_dev *dd = ctx->dd; 445 unsigned long flags; 446 447 spin_lock_irqsave(&dd->lock, flags); 448 if (ctx->flags & FLAGS_CLEAN) { 449 spin_unlock_irqrestore(&dd->lock, flags); 450 return; 451 } 452 ctx->flags |= FLAGS_CLEAN; 453 spin_unlock_irqrestore(&dd->lock, flags); 454 455 if (ctx->digcnt) 456 clk_disable(dd->iclk); 457 458 if (ctx->dma_addr) 459 dma_unmap_single(dd->dev, ctx->dma_addr, ctx->buflen, 460 DMA_TO_DEVICE); 461 462 if (ctx->buffer) 463 free_page((unsigned long)ctx->buffer); 464 465 dev_dbg(dd->dev, "digcnt: %d, bufcnt: %d\n", ctx->digcnt, ctx->bufcnt); 466 } 467 468 static int omap_sham_init(struct ahash_request *req) 469 { 470 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); 471 struct omap_sham_ctx *tctx = crypto_ahash_ctx(tfm); 472 struct omap_sham_reqctx *ctx = ahash_request_ctx(req); 473 struct omap_sham_dev *dd = NULL, *tmp; 474 475 spin_lock_bh(&sham.lock); 476 if (!tctx->dd) { 477 list_for_each_entry(tmp, &sham.dev_list, list) { 478 dd = tmp; 479 break; 480 } 481 tctx->dd = dd; 482 } else { 483 dd = tctx->dd; 484 } 485 spin_unlock_bh(&sham.lock); 486 487 ctx->dd = dd; 488 489 ctx->flags = 0; 490 491 ctx->flags |= FLAGS_FIRST; 492 493 dev_dbg(dd->dev, "init: digest size: %d\n", 494 crypto_ahash_digestsize(tfm)); 495 496 if (crypto_ahash_digestsize(tfm) == SHA1_DIGEST_SIZE) 497 ctx->flags |= FLAGS_SHA1; 498 499 ctx->bufcnt = 0; 500 ctx->digcnt = 0; 501 502 ctx->buflen = PAGE_SIZE; 503 ctx->buffer = (void *)__get_free_page( 504 (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ? 505 GFP_KERNEL : GFP_ATOMIC); 506 if (!ctx->buffer) 507 return -ENOMEM; 508 509 ctx->dma_addr = dma_map_single(dd->dev, ctx->buffer, ctx->buflen, 510 DMA_TO_DEVICE); 511 if (dma_mapping_error(dd->dev, ctx->dma_addr)) { 512 dev_err(dd->dev, "dma %u bytes error\n", ctx->buflen); 513 free_page((unsigned long)ctx->buffer); 514 return -EINVAL; 515 } 516 517 if (tctx->flags & FLAGS_HMAC) { 518 struct omap_sham_hmac_ctx *bctx = tctx->base; 519 520 memcpy(ctx->buffer, bctx->ipad, SHA1_MD5_BLOCK_SIZE); 521 ctx->bufcnt = SHA1_MD5_BLOCK_SIZE; 522 ctx->flags |= FLAGS_HMAC; 523 } 524 525 return 0; 526 527 } 528 529 static int omap_sham_update_req(struct omap_sham_dev *dd) 530 { 531 struct ahash_request *req = dd->req; 532 struct omap_sham_reqctx *ctx = ahash_request_ctx(req); 533 int err; 534 535 dev_dbg(dd->dev, "update_req: total: %u, digcnt: %d, finup: %d\n", 536 ctx->total, ctx->digcnt, (ctx->flags & FLAGS_FINUP) != 0); 537 538 if (ctx->flags & FLAGS_CPU) 539 err = omap_sham_update_cpu(dd); 540 else if (ctx->flags & FLAGS_FAST) 541 err = omap_sham_update_dma_fast(dd); 542 else 543 err = omap_sham_update_dma_slow(dd); 544 545 /* wait for dma completion before can take more data */ 546 dev_dbg(dd->dev, "update: err: %d, digcnt: %d\n", err, ctx->digcnt); 547 548 return err; 549 } 550 551 static int omap_sham_final_req(struct omap_sham_dev *dd) 552 { 553 struct ahash_request *req = dd->req; 554 struct omap_sham_reqctx *ctx = ahash_request_ctx(req); 555 int err = 0, use_dma = 1; 556 557 if (ctx->bufcnt <= 64) 558 /* faster to handle last block with cpu */ 559 use_dma = 0; 560 561 if (use_dma) 562 err = omap_sham_xmit_dma(dd, ctx->dma_addr, ctx->bufcnt, 1); 563 else 564 err = omap_sham_xmit_cpu(dd, ctx->buffer, ctx->bufcnt, 1); 565 566 ctx->bufcnt = 0; 567 568 if (err != -EINPROGRESS) 569 omap_sham_cleanup(req); 570 571 dev_dbg(dd->dev, "final_req: err: %d\n", err); 572 573 return err; 574 } 575 576 static int omap_sham_finish_req_hmac(struct ahash_request *req) 577 { 578 struct omap_sham_ctx *tctx = crypto_tfm_ctx(req->base.tfm); 579 struct omap_sham_hmac_ctx *bctx = tctx->base; 580 int bs = crypto_shash_blocksize(bctx->shash); 581 int ds = crypto_shash_digestsize(bctx->shash); 582 struct { 583 struct shash_desc shash; 584 char ctx[crypto_shash_descsize(bctx->shash)]; 585 } desc; 586 587 desc.shash.tfm = bctx->shash; 588 desc.shash.flags = 0; /* not CRYPTO_TFM_REQ_MAY_SLEEP */ 589 590 return crypto_shash_init(&desc.shash) ?: 591 crypto_shash_update(&desc.shash, bctx->opad, bs) ?: 592 crypto_shash_finup(&desc.shash, req->result, ds, req->result); 593 } 594 595 static void omap_sham_finish_req(struct ahash_request *req, int err) 596 { 597 struct omap_sham_reqctx *ctx = ahash_request_ctx(req); 598 599 if (!err) { 600 omap_sham_copy_hash(ctx->dd->req, 1); 601 if (ctx->flags & FLAGS_HMAC) 602 err = omap_sham_finish_req_hmac(req); 603 } 604 605 if (ctx->flags & FLAGS_FINAL) 606 omap_sham_cleanup(req); 607 608 clear_bit(FLAGS_BUSY, &ctx->dd->flags); 609 610 if (req->base.complete) 611 req->base.complete(&req->base, err); 612 } 613 614 static int omap_sham_handle_queue(struct omap_sham_dev *dd) 615 { 616 struct crypto_async_request *async_req, *backlog; 617 struct omap_sham_reqctx *ctx; 618 struct ahash_request *req, *prev_req; 619 unsigned long flags; 620 int err = 0; 621 622 if (test_and_set_bit(FLAGS_BUSY, &dd->flags)) 623 return 0; 624 625 spin_lock_irqsave(&dd->lock, flags); 626 backlog = crypto_get_backlog(&dd->queue); 627 async_req = crypto_dequeue_request(&dd->queue); 628 if (!async_req) 629 clear_bit(FLAGS_BUSY, &dd->flags); 630 spin_unlock_irqrestore(&dd->lock, flags); 631 632 if (!async_req) 633 return 0; 634 635 if (backlog) 636 backlog->complete(backlog, -EINPROGRESS); 637 638 req = ahash_request_cast(async_req); 639 640 prev_req = dd->req; 641 dd->req = req; 642 643 ctx = ahash_request_ctx(req); 644 645 dev_dbg(dd->dev, "handling new req, op: %lu, nbytes: %d\n", 646 ctx->op, req->nbytes); 647 648 if (req != prev_req && ctx->digcnt) 649 /* request has changed - restore hash */ 650 omap_sham_copy_hash(req, 0); 651 652 if (ctx->op == OP_UPDATE) { 653 err = omap_sham_update_req(dd); 654 if (err != -EINPROGRESS && (ctx->flags & FLAGS_FINUP)) 655 /* no final() after finup() */ 656 err = omap_sham_final_req(dd); 657 } else if (ctx->op == OP_FINAL) { 658 err = omap_sham_final_req(dd); 659 } 660 661 if (err != -EINPROGRESS) { 662 /* done_task will not finish it, so do it here */ 663 omap_sham_finish_req(req, err); 664 tasklet_schedule(&dd->queue_task); 665 } 666 667 dev_dbg(dd->dev, "exit, err: %d\n", err); 668 669 return err; 670 } 671 672 static int omap_sham_enqueue(struct ahash_request *req, unsigned int op) 673 { 674 struct omap_sham_reqctx *ctx = ahash_request_ctx(req); 675 struct omap_sham_ctx *tctx = crypto_tfm_ctx(req->base.tfm); 676 struct omap_sham_dev *dd = tctx->dd; 677 unsigned long flags; 678 int err; 679 680 ctx->op = op; 681 682 spin_lock_irqsave(&dd->lock, flags); 683 err = ahash_enqueue_request(&dd->queue, req); 684 spin_unlock_irqrestore(&dd->lock, flags); 685 686 omap_sham_handle_queue(dd); 687 688 return err; 689 } 690 691 static int omap_sham_update(struct ahash_request *req) 692 { 693 struct omap_sham_reqctx *ctx = ahash_request_ctx(req); 694 695 if (!req->nbytes) 696 return 0; 697 698 ctx->total = req->nbytes; 699 ctx->sg = req->src; 700 ctx->offset = 0; 701 702 if (ctx->flags & FLAGS_FINUP) { 703 if ((ctx->digcnt + ctx->bufcnt + ctx->total) < 9) { 704 /* 705 * OMAP HW accel works only with buffers >= 9 706 * will switch to bypass in final() 707 * final has the same request and data 708 */ 709 omap_sham_append_sg(ctx); 710 return 0; 711 } else if (ctx->bufcnt + ctx->total <= 64) { 712 ctx->flags |= FLAGS_CPU; 713 } else if (!ctx->bufcnt && sg_is_last(ctx->sg)) { 714 /* may be can use faster functions */ 715 int aligned = IS_ALIGNED((u32)ctx->sg->offset, 716 sizeof(u32)); 717 718 if (aligned && (ctx->flags & FLAGS_FIRST)) 719 /* digest: first and final */ 720 ctx->flags |= FLAGS_FAST; 721 722 ctx->flags &= ~FLAGS_FIRST; 723 } 724 } else if (ctx->bufcnt + ctx->total <= ctx->buflen) { 725 /* if not finaup -> not fast */ 726 omap_sham_append_sg(ctx); 727 return 0; 728 } 729 730 return omap_sham_enqueue(req, OP_UPDATE); 731 } 732 733 static int omap_sham_shash_digest(struct crypto_shash *shash, u32 flags, 734 const u8 *data, unsigned int len, u8 *out) 735 { 736 struct { 737 struct shash_desc shash; 738 char ctx[crypto_shash_descsize(shash)]; 739 } desc; 740 741 desc.shash.tfm = shash; 742 desc.shash.flags = flags & CRYPTO_TFM_REQ_MAY_SLEEP; 743 744 return crypto_shash_digest(&desc.shash, data, len, out); 745 } 746 747 static int omap_sham_final_shash(struct ahash_request *req) 748 { 749 struct omap_sham_ctx *tctx = crypto_tfm_ctx(req->base.tfm); 750 struct omap_sham_reqctx *ctx = ahash_request_ctx(req); 751 752 return omap_sham_shash_digest(tctx->fallback, req->base.flags, 753 ctx->buffer, ctx->bufcnt, req->result); 754 } 755 756 static int omap_sham_final(struct ahash_request *req) 757 { 758 struct omap_sham_reqctx *ctx = ahash_request_ctx(req); 759 int err = 0; 760 761 ctx->flags |= FLAGS_FINUP; 762 763 /* OMAP HW accel works only with buffers >= 9 */ 764 /* HMAC is always >= 9 because of ipad */ 765 if ((ctx->digcnt + ctx->bufcnt) < 9) 766 err = omap_sham_final_shash(req); 767 else if (ctx->bufcnt) 768 return omap_sham_enqueue(req, OP_FINAL); 769 770 omap_sham_cleanup(req); 771 772 return err; 773 } 774 775 static int omap_sham_finup(struct ahash_request *req) 776 { 777 struct omap_sham_reqctx *ctx = ahash_request_ctx(req); 778 int err1, err2; 779 780 ctx->flags |= FLAGS_FINUP; 781 782 err1 = omap_sham_update(req); 783 if (err1 == -EINPROGRESS) 784 return err1; 785 /* 786 * final() has to be always called to cleanup resources 787 * even if udpate() failed, except EINPROGRESS 788 */ 789 err2 = omap_sham_final(req); 790 791 return err1 ?: err2; 792 } 793 794 static int omap_sham_digest(struct ahash_request *req) 795 { 796 return omap_sham_init(req) ?: omap_sham_finup(req); 797 } 798 799 static int omap_sham_setkey(struct crypto_ahash *tfm, const u8 *key, 800 unsigned int keylen) 801 { 802 struct omap_sham_ctx *tctx = crypto_ahash_ctx(tfm); 803 struct omap_sham_hmac_ctx *bctx = tctx->base; 804 int bs = crypto_shash_blocksize(bctx->shash); 805 int ds = crypto_shash_digestsize(bctx->shash); 806 int err, i; 807 err = crypto_shash_setkey(tctx->fallback, key, keylen); 808 if (err) 809 return err; 810 811 if (keylen > bs) { 812 err = omap_sham_shash_digest(bctx->shash, 813 crypto_shash_get_flags(bctx->shash), 814 key, keylen, bctx->ipad); 815 if (err) 816 return err; 817 keylen = ds; 818 } else { 819 memcpy(bctx->ipad, key, keylen); 820 } 821 822 memset(bctx->ipad + keylen, 0, bs - keylen); 823 memcpy(bctx->opad, bctx->ipad, bs); 824 825 for (i = 0; i < bs; i++) { 826 bctx->ipad[i] ^= 0x36; 827 bctx->opad[i] ^= 0x5c; 828 } 829 830 return err; 831 } 832 833 static int omap_sham_cra_init_alg(struct crypto_tfm *tfm, const char *alg_base) 834 { 835 struct omap_sham_ctx *tctx = crypto_tfm_ctx(tfm); 836 const char *alg_name = crypto_tfm_alg_name(tfm); 837 838 /* Allocate a fallback and abort if it failed. */ 839 tctx->fallback = crypto_alloc_shash(alg_name, 0, 840 CRYPTO_ALG_NEED_FALLBACK); 841 if (IS_ERR(tctx->fallback)) { 842 pr_err("omap-sham: fallback driver '%s' " 843 "could not be loaded.\n", alg_name); 844 return PTR_ERR(tctx->fallback); 845 } 846 847 crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm), 848 sizeof(struct omap_sham_reqctx)); 849 850 if (alg_base) { 851 struct omap_sham_hmac_ctx *bctx = tctx->base; 852 tctx->flags |= FLAGS_HMAC; 853 bctx->shash = crypto_alloc_shash(alg_base, 0, 854 CRYPTO_ALG_NEED_FALLBACK); 855 if (IS_ERR(bctx->shash)) { 856 pr_err("omap-sham: base driver '%s' " 857 "could not be loaded.\n", alg_base); 858 crypto_free_shash(tctx->fallback); 859 return PTR_ERR(bctx->shash); 860 } 861 862 } 863 864 return 0; 865 } 866 867 static int omap_sham_cra_init(struct crypto_tfm *tfm) 868 { 869 return omap_sham_cra_init_alg(tfm, NULL); 870 } 871 872 static int omap_sham_cra_sha1_init(struct crypto_tfm *tfm) 873 { 874 return omap_sham_cra_init_alg(tfm, "sha1"); 875 } 876 877 static int omap_sham_cra_md5_init(struct crypto_tfm *tfm) 878 { 879 return omap_sham_cra_init_alg(tfm, "md5"); 880 } 881 882 static void omap_sham_cra_exit(struct crypto_tfm *tfm) 883 { 884 struct omap_sham_ctx *tctx = crypto_tfm_ctx(tfm); 885 886 crypto_free_shash(tctx->fallback); 887 tctx->fallback = NULL; 888 889 if (tctx->flags & FLAGS_HMAC) { 890 struct omap_sham_hmac_ctx *bctx = tctx->base; 891 crypto_free_shash(bctx->shash); 892 } 893 } 894 895 static struct ahash_alg algs[] = { 896 { 897 .init = omap_sham_init, 898 .update = omap_sham_update, 899 .final = omap_sham_final, 900 .finup = omap_sham_finup, 901 .digest = omap_sham_digest, 902 .halg.digestsize = SHA1_DIGEST_SIZE, 903 .halg.base = { 904 .cra_name = "sha1", 905 .cra_driver_name = "omap-sha1", 906 .cra_priority = 100, 907 .cra_flags = CRYPTO_ALG_TYPE_AHASH | 908 CRYPTO_ALG_ASYNC | 909 CRYPTO_ALG_NEED_FALLBACK, 910 .cra_blocksize = SHA1_BLOCK_SIZE, 911 .cra_ctxsize = sizeof(struct omap_sham_ctx), 912 .cra_alignmask = 0, 913 .cra_module = THIS_MODULE, 914 .cra_init = omap_sham_cra_init, 915 .cra_exit = omap_sham_cra_exit, 916 } 917 }, 918 { 919 .init = omap_sham_init, 920 .update = omap_sham_update, 921 .final = omap_sham_final, 922 .finup = omap_sham_finup, 923 .digest = omap_sham_digest, 924 .halg.digestsize = MD5_DIGEST_SIZE, 925 .halg.base = { 926 .cra_name = "md5", 927 .cra_driver_name = "omap-md5", 928 .cra_priority = 100, 929 .cra_flags = CRYPTO_ALG_TYPE_AHASH | 930 CRYPTO_ALG_ASYNC | 931 CRYPTO_ALG_NEED_FALLBACK, 932 .cra_blocksize = SHA1_BLOCK_SIZE, 933 .cra_ctxsize = sizeof(struct omap_sham_ctx), 934 .cra_alignmask = 0, 935 .cra_module = THIS_MODULE, 936 .cra_init = omap_sham_cra_init, 937 .cra_exit = omap_sham_cra_exit, 938 } 939 }, 940 { 941 .init = omap_sham_init, 942 .update = omap_sham_update, 943 .final = omap_sham_final, 944 .finup = omap_sham_finup, 945 .digest = omap_sham_digest, 946 .setkey = omap_sham_setkey, 947 .halg.digestsize = SHA1_DIGEST_SIZE, 948 .halg.base = { 949 .cra_name = "hmac(sha1)", 950 .cra_driver_name = "omap-hmac-sha1", 951 .cra_priority = 100, 952 .cra_flags = CRYPTO_ALG_TYPE_AHASH | 953 CRYPTO_ALG_ASYNC | 954 CRYPTO_ALG_NEED_FALLBACK, 955 .cra_blocksize = SHA1_BLOCK_SIZE, 956 .cra_ctxsize = sizeof(struct omap_sham_ctx) + 957 sizeof(struct omap_sham_hmac_ctx), 958 .cra_alignmask = 0, 959 .cra_module = THIS_MODULE, 960 .cra_init = omap_sham_cra_sha1_init, 961 .cra_exit = omap_sham_cra_exit, 962 } 963 }, 964 { 965 .init = omap_sham_init, 966 .update = omap_sham_update, 967 .final = omap_sham_final, 968 .finup = omap_sham_finup, 969 .digest = omap_sham_digest, 970 .setkey = omap_sham_setkey, 971 .halg.digestsize = MD5_DIGEST_SIZE, 972 .halg.base = { 973 .cra_name = "hmac(md5)", 974 .cra_driver_name = "omap-hmac-md5", 975 .cra_priority = 100, 976 .cra_flags = CRYPTO_ALG_TYPE_AHASH | 977 CRYPTO_ALG_ASYNC | 978 CRYPTO_ALG_NEED_FALLBACK, 979 .cra_blocksize = SHA1_BLOCK_SIZE, 980 .cra_ctxsize = sizeof(struct omap_sham_ctx) + 981 sizeof(struct omap_sham_hmac_ctx), 982 .cra_alignmask = 0, 983 .cra_module = THIS_MODULE, 984 .cra_init = omap_sham_cra_md5_init, 985 .cra_exit = omap_sham_cra_exit, 986 } 987 } 988 }; 989 990 static void omap_sham_done_task(unsigned long data) 991 { 992 struct omap_sham_dev *dd = (struct omap_sham_dev *)data; 993 struct ahash_request *req = dd->req; 994 struct omap_sham_reqctx *ctx = ahash_request_ctx(req); 995 int ready = 1; 996 997 if (ctx->flags & FLAGS_OUTPUT_READY) { 998 ctx->flags &= ~FLAGS_OUTPUT_READY; 999 ready = 1; 1000 } 1001 1002 if (dd->flags & FLAGS_DMA_ACTIVE) { 1003 dd->flags &= ~FLAGS_DMA_ACTIVE; 1004 omap_sham_update_dma_stop(dd); 1005 omap_sham_update_dma_slow(dd); 1006 } 1007 1008 if (ready && !(dd->flags & FLAGS_DMA_ACTIVE)) { 1009 dev_dbg(dd->dev, "update done\n"); 1010 /* finish curent request */ 1011 omap_sham_finish_req(req, 0); 1012 /* start new request */ 1013 omap_sham_handle_queue(dd); 1014 } 1015 } 1016 1017 static void omap_sham_queue_task(unsigned long data) 1018 { 1019 struct omap_sham_dev *dd = (struct omap_sham_dev *)data; 1020 1021 omap_sham_handle_queue(dd); 1022 } 1023 1024 static irqreturn_t omap_sham_irq(int irq, void *dev_id) 1025 { 1026 struct omap_sham_dev *dd = dev_id; 1027 struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req); 1028 1029 if (!ctx) { 1030 dev_err(dd->dev, "unknown interrupt.\n"); 1031 return IRQ_HANDLED; 1032 } 1033 1034 if (unlikely(ctx->flags & FLAGS_FINAL)) 1035 /* final -> allow device to go to power-saving mode */ 1036 omap_sham_write_mask(dd, SHA_REG_CTRL, 0, SHA_REG_CTRL_LENGTH); 1037 1038 omap_sham_write_mask(dd, SHA_REG_CTRL, SHA_REG_CTRL_OUTPUT_READY, 1039 SHA_REG_CTRL_OUTPUT_READY); 1040 omap_sham_read(dd, SHA_REG_CTRL); 1041 1042 ctx->flags |= FLAGS_OUTPUT_READY; 1043 tasklet_schedule(&dd->done_task); 1044 1045 return IRQ_HANDLED; 1046 } 1047 1048 static void omap_sham_dma_callback(int lch, u16 ch_status, void *data) 1049 { 1050 struct omap_sham_dev *dd = data; 1051 1052 if (likely(lch == dd->dma_lch)) 1053 tasklet_schedule(&dd->done_task); 1054 } 1055 1056 static int omap_sham_dma_init(struct omap_sham_dev *dd) 1057 { 1058 int err; 1059 1060 dd->dma_lch = -1; 1061 1062 err = omap_request_dma(dd->dma, dev_name(dd->dev), 1063 omap_sham_dma_callback, dd, &dd->dma_lch); 1064 if (err) { 1065 dev_err(dd->dev, "Unable to request DMA channel\n"); 1066 return err; 1067 } 1068 omap_set_dma_dest_params(dd->dma_lch, 0, 1069 OMAP_DMA_AMODE_CONSTANT, 1070 dd->phys_base + SHA_REG_DIN(0), 0, 16); 1071 1072 omap_set_dma_dest_burst_mode(dd->dma_lch, 1073 OMAP_DMA_DATA_BURST_16); 1074 1075 return 0; 1076 } 1077 1078 static void omap_sham_dma_cleanup(struct omap_sham_dev *dd) 1079 { 1080 if (dd->dma_lch >= 0) { 1081 omap_free_dma(dd->dma_lch); 1082 dd->dma_lch = -1; 1083 } 1084 } 1085 1086 static int __devinit omap_sham_probe(struct platform_device *pdev) 1087 { 1088 struct omap_sham_dev *dd; 1089 struct device *dev = &pdev->dev; 1090 struct resource *res; 1091 int err, i, j; 1092 1093 dd = kzalloc(sizeof(struct omap_sham_dev), GFP_KERNEL); 1094 if (dd == NULL) { 1095 dev_err(dev, "unable to alloc data struct.\n"); 1096 err = -ENOMEM; 1097 goto data_err; 1098 } 1099 dd->dev = dev; 1100 platform_set_drvdata(pdev, dd); 1101 1102 INIT_LIST_HEAD(&dd->list); 1103 spin_lock_init(&dd->lock); 1104 tasklet_init(&dd->done_task, omap_sham_done_task, (unsigned long)dd); 1105 tasklet_init(&dd->queue_task, omap_sham_queue_task, (unsigned long)dd); 1106 crypto_init_queue(&dd->queue, OMAP_SHAM_QUEUE_LENGTH); 1107 1108 dd->irq = -1; 1109 1110 /* Get the base address */ 1111 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1112 if (!res) { 1113 dev_err(dev, "no MEM resource info\n"); 1114 err = -ENODEV; 1115 goto res_err; 1116 } 1117 dd->phys_base = res->start; 1118 1119 /* Get the DMA */ 1120 res = platform_get_resource(pdev, IORESOURCE_DMA, 0); 1121 if (!res) { 1122 dev_err(dev, "no DMA resource info\n"); 1123 err = -ENODEV; 1124 goto res_err; 1125 } 1126 dd->dma = res->start; 1127 1128 /* Get the IRQ */ 1129 dd->irq = platform_get_irq(pdev, 0); 1130 if (dd->irq < 0) { 1131 dev_err(dev, "no IRQ resource info\n"); 1132 err = dd->irq; 1133 goto res_err; 1134 } 1135 1136 err = request_irq(dd->irq, omap_sham_irq, 1137 IRQF_TRIGGER_LOW, dev_name(dev), dd); 1138 if (err) { 1139 dev_err(dev, "unable to request irq.\n"); 1140 goto res_err; 1141 } 1142 1143 err = omap_sham_dma_init(dd); 1144 if (err) 1145 goto dma_err; 1146 1147 /* Initializing the clock */ 1148 dd->iclk = clk_get(dev, "ick"); 1149 if (!dd->iclk) { 1150 dev_err(dev, "clock intialization failed.\n"); 1151 err = -ENODEV; 1152 goto clk_err; 1153 } 1154 1155 dd->io_base = ioremap(dd->phys_base, SZ_4K); 1156 if (!dd->io_base) { 1157 dev_err(dev, "can't ioremap\n"); 1158 err = -ENOMEM; 1159 goto io_err; 1160 } 1161 1162 clk_enable(dd->iclk); 1163 dev_info(dev, "hw accel on OMAP rev %u.%u\n", 1164 (omap_sham_read(dd, SHA_REG_REV) & SHA_REG_REV_MAJOR) >> 4, 1165 omap_sham_read(dd, SHA_REG_REV) & SHA_REG_REV_MINOR); 1166 clk_disable(dd->iclk); 1167 1168 spin_lock(&sham.lock); 1169 list_add_tail(&dd->list, &sham.dev_list); 1170 spin_unlock(&sham.lock); 1171 1172 for (i = 0; i < ARRAY_SIZE(algs); i++) { 1173 err = crypto_register_ahash(&algs[i]); 1174 if (err) 1175 goto err_algs; 1176 } 1177 1178 return 0; 1179 1180 err_algs: 1181 for (j = 0; j < i; j++) 1182 crypto_unregister_ahash(&algs[j]); 1183 iounmap(dd->io_base); 1184 io_err: 1185 clk_put(dd->iclk); 1186 clk_err: 1187 omap_sham_dma_cleanup(dd); 1188 dma_err: 1189 if (dd->irq >= 0) 1190 free_irq(dd->irq, dd); 1191 res_err: 1192 kfree(dd); 1193 dd = NULL; 1194 data_err: 1195 dev_err(dev, "initialization failed.\n"); 1196 1197 return err; 1198 } 1199 1200 static int __devexit omap_sham_remove(struct platform_device *pdev) 1201 { 1202 static struct omap_sham_dev *dd; 1203 int i; 1204 1205 dd = platform_get_drvdata(pdev); 1206 if (!dd) 1207 return -ENODEV; 1208 spin_lock(&sham.lock); 1209 list_del(&dd->list); 1210 spin_unlock(&sham.lock); 1211 for (i = 0; i < ARRAY_SIZE(algs); i++) 1212 crypto_unregister_ahash(&algs[i]); 1213 tasklet_kill(&dd->done_task); 1214 tasklet_kill(&dd->queue_task); 1215 iounmap(dd->io_base); 1216 clk_put(dd->iclk); 1217 omap_sham_dma_cleanup(dd); 1218 if (dd->irq >= 0) 1219 free_irq(dd->irq, dd); 1220 kfree(dd); 1221 dd = NULL; 1222 1223 return 0; 1224 } 1225 1226 static struct platform_driver omap_sham_driver = { 1227 .probe = omap_sham_probe, 1228 .remove = omap_sham_remove, 1229 .driver = { 1230 .name = "omap-sham", 1231 .owner = THIS_MODULE, 1232 }, 1233 }; 1234 1235 static int __init omap_sham_mod_init(void) 1236 { 1237 pr_info("loading %s driver\n", "omap-sham"); 1238 1239 if (!cpu_class_is_omap2() || 1240 omap_type() != OMAP2_DEVICE_TYPE_SEC) { 1241 pr_err("Unsupported cpu\n"); 1242 return -ENODEV; 1243 } 1244 1245 return platform_driver_register(&omap_sham_driver); 1246 } 1247 1248 static void __exit omap_sham_mod_exit(void) 1249 { 1250 platform_driver_unregister(&omap_sham_driver); 1251 } 1252 1253 module_init(omap_sham_mod_init); 1254 module_exit(omap_sham_mod_exit); 1255 1256 MODULE_DESCRIPTION("OMAP SHA1/MD5 hw acceleration support."); 1257 MODULE_LICENSE("GPL v2"); 1258 MODULE_AUTHOR("Dmitry Kasatkin"); 1259