1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Cryptographic API. 4 * 5 * Support for OMAP AES HW acceleration. 6 * 7 * Copyright (c) 2010 Nokia Corporation 8 * Author: Dmitry Kasatkin <dmitry.kasatkin@nokia.com> 9 * Copyright (c) 2011 Texas Instruments Incorporated 10 */ 11 12 #define pr_fmt(fmt) "%20s: " fmt, __func__ 13 #define prn(num) pr_debug(#num "=%d\n", num) 14 #define prx(num) pr_debug(#num "=%x\n", num) 15 16 #include <crypto/aes.h> 17 #include <crypto/gcm.h> 18 #include <crypto/internal/aead.h> 19 #include <crypto/internal/engine.h> 20 #include <crypto/internal/skcipher.h> 21 #include <crypto/scatterwalk.h> 22 #include <linux/dma-mapping.h> 23 #include <linux/dmaengine.h> 24 #include <linux/err.h> 25 #include <linux/init.h> 26 #include <linux/interrupt.h> 27 #include <linux/io.h> 28 #include <linux/kernel.h> 29 #include <linux/module.h> 30 #include <linux/of.h> 31 #include <linux/of_device.h> 32 #include <linux/of_address.h> 33 #include <linux/platform_device.h> 34 #include <linux/pm_runtime.h> 35 #include <linux/scatterlist.h> 36 #include <linux/string.h> 37 38 #include "omap-crypto.h" 39 #include "omap-aes.h" 40 41 /* keep registered devices data here */ 42 static LIST_HEAD(dev_list); 43 static DEFINE_SPINLOCK(list_lock); 44 45 static int aes_fallback_sz = 200; 46 47 #ifdef DEBUG 48 #define omap_aes_read(dd, offset) \ 49 ({ \ 50 int _read_ret; \ 51 _read_ret = __raw_readl(dd->io_base + offset); \ 52 pr_debug("omap_aes_read(" #offset "=%#x)= %#x\n", \ 53 offset, _read_ret); \ 54 _read_ret; \ 55 }) 56 #else 57 inline u32 omap_aes_read(struct omap_aes_dev *dd, u32 offset) 58 { 59 return __raw_readl(dd->io_base + offset); 60 } 61 #endif 62 63 #ifdef DEBUG 64 #define omap_aes_write(dd, offset, value) \ 65 do { \ 66 pr_debug("omap_aes_write(" #offset "=%#x) value=%#x\n", \ 67 offset, value); \ 68 __raw_writel(value, dd->io_base + offset); \ 69 } while (0) 70 #else 71 inline void omap_aes_write(struct omap_aes_dev *dd, u32 offset, 72 u32 value) 73 { 74 __raw_writel(value, dd->io_base + offset); 75 } 76 #endif 77 78 static inline void omap_aes_write_mask(struct omap_aes_dev *dd, u32 offset, 79 u32 value, u32 mask) 80 { 81 u32 val; 82 83 val = omap_aes_read(dd, offset); 84 val &= ~mask; 85 val |= value; 86 omap_aes_write(dd, offset, val); 87 } 88 89 static void omap_aes_write_n(struct omap_aes_dev *dd, u32 offset, 90 u32 *value, int count) 91 { 92 for (; count--; value++, offset += 4) 93 omap_aes_write(dd, offset, *value); 94 } 95 96 static int omap_aes_hw_init(struct omap_aes_dev *dd) 97 { 98 int err; 99 100 if (!(dd->flags & FLAGS_INIT)) { 101 dd->flags |= FLAGS_INIT; 102 dd->err = 0; 103 } 104 105 err = pm_runtime_resume_and_get(dd->dev); 106 if (err < 0) { 107 dev_err(dd->dev, "failed to get sync: %d\n", err); 108 return err; 109 } 110 111 return 0; 112 } 113 114 void omap_aes_clear_copy_flags(struct omap_aes_dev *dd) 115 { 116 dd->flags &= ~(OMAP_CRYPTO_COPY_MASK << FLAGS_IN_DATA_ST_SHIFT); 117 dd->flags &= ~(OMAP_CRYPTO_COPY_MASK << FLAGS_OUT_DATA_ST_SHIFT); 118 dd->flags &= ~(OMAP_CRYPTO_COPY_MASK << FLAGS_ASSOC_DATA_ST_SHIFT); 119 } 120 121 int omap_aes_write_ctrl(struct omap_aes_dev *dd) 122 { 123 struct omap_aes_reqctx *rctx; 124 unsigned int key32; 125 int i, err; 126 u32 val; 127 128 err = omap_aes_hw_init(dd); 129 if (err) 130 return err; 131 132 key32 = dd->ctx->keylen / sizeof(u32); 133 134 /* RESET the key as previous HASH keys should not get affected*/ 135 if (dd->flags & FLAGS_GCM) 136 for (i = 0; i < 0x40; i = i + 4) 137 omap_aes_write(dd, i, 0x0); 138 139 for (i = 0; i < key32; i++) { 140 omap_aes_write(dd, AES_REG_KEY(dd, i), 141 (__force u32)cpu_to_le32(dd->ctx->key[i])); 142 } 143 144 if ((dd->flags & (FLAGS_CBC | FLAGS_CTR)) && dd->req->iv) 145 omap_aes_write_n(dd, AES_REG_IV(dd, 0), (void *)dd->req->iv, 4); 146 147 if ((dd->flags & (FLAGS_GCM)) && dd->aead_req->iv) { 148 rctx = aead_request_ctx(dd->aead_req); 149 omap_aes_write_n(dd, AES_REG_IV(dd, 0), (u32 *)rctx->iv, 4); 150 } 151 152 val = FLD_VAL(((dd->ctx->keylen >> 3) - 1), 4, 3); 153 if (dd->flags & FLAGS_CBC) 154 val |= AES_REG_CTRL_CBC; 155 156 if (dd->flags & (FLAGS_CTR | FLAGS_GCM)) 157 val |= AES_REG_CTRL_CTR | AES_REG_CTRL_CTR_WIDTH_128; 158 159 if (dd->flags & FLAGS_GCM) 160 val |= AES_REG_CTRL_GCM; 161 162 if (dd->flags & FLAGS_ENCRYPT) 163 val |= AES_REG_CTRL_DIRECTION; 164 165 omap_aes_write_mask(dd, AES_REG_CTRL(dd), val, AES_REG_CTRL_MASK); 166 167 return 0; 168 } 169 170 static void omap_aes_dma_trigger_omap2(struct omap_aes_dev *dd, int length) 171 { 172 u32 mask, val; 173 174 val = dd->pdata->dma_start; 175 176 if (dd->dma_lch_out != NULL) 177 val |= dd->pdata->dma_enable_out; 178 if (dd->dma_lch_in != NULL) 179 val |= dd->pdata->dma_enable_in; 180 181 mask = dd->pdata->dma_enable_out | dd->pdata->dma_enable_in | 182 dd->pdata->dma_start; 183 184 omap_aes_write_mask(dd, AES_REG_MASK(dd), val, mask); 185 186 } 187 188 static void omap_aes_dma_trigger_omap4(struct omap_aes_dev *dd, int length) 189 { 190 omap_aes_write(dd, AES_REG_LENGTH_N(0), length); 191 omap_aes_write(dd, AES_REG_LENGTH_N(1), 0); 192 if (dd->flags & FLAGS_GCM) 193 omap_aes_write(dd, AES_REG_A_LEN, dd->assoc_len); 194 195 omap_aes_dma_trigger_omap2(dd, length); 196 } 197 198 static void omap_aes_dma_stop(struct omap_aes_dev *dd) 199 { 200 u32 mask; 201 202 mask = dd->pdata->dma_enable_out | dd->pdata->dma_enable_in | 203 dd->pdata->dma_start; 204 205 omap_aes_write_mask(dd, AES_REG_MASK(dd), 0, mask); 206 } 207 208 struct omap_aes_dev *omap_aes_find_dev(struct omap_aes_reqctx *rctx) 209 { 210 struct omap_aes_dev *dd; 211 212 spin_lock_bh(&list_lock); 213 dd = list_first_entry(&dev_list, struct omap_aes_dev, list); 214 list_move_tail(&dd->list, &dev_list); 215 rctx->dd = dd; 216 spin_unlock_bh(&list_lock); 217 218 return dd; 219 } 220 221 static void omap_aes_dma_out_callback(void *data) 222 { 223 struct omap_aes_dev *dd = data; 224 225 /* dma_lch_out - completed */ 226 tasklet_schedule(&dd->done_task); 227 } 228 229 static int omap_aes_dma_init(struct omap_aes_dev *dd) 230 { 231 int err; 232 233 dd->dma_lch_out = NULL; 234 dd->dma_lch_in = NULL; 235 236 dd->dma_lch_in = dma_request_chan(dd->dev, "rx"); 237 if (IS_ERR(dd->dma_lch_in)) { 238 dev_err(dd->dev, "Unable to request in DMA channel\n"); 239 return PTR_ERR(dd->dma_lch_in); 240 } 241 242 dd->dma_lch_out = dma_request_chan(dd->dev, "tx"); 243 if (IS_ERR(dd->dma_lch_out)) { 244 dev_err(dd->dev, "Unable to request out DMA channel\n"); 245 err = PTR_ERR(dd->dma_lch_out); 246 goto err_dma_out; 247 } 248 249 return 0; 250 251 err_dma_out: 252 dma_release_channel(dd->dma_lch_in); 253 254 return err; 255 } 256 257 static void omap_aes_dma_cleanup(struct omap_aes_dev *dd) 258 { 259 if (dd->pio_only) 260 return; 261 262 dma_release_channel(dd->dma_lch_out); 263 dma_release_channel(dd->dma_lch_in); 264 } 265 266 static int omap_aes_crypt_dma(struct omap_aes_dev *dd, 267 struct scatterlist *in_sg, 268 struct scatterlist *out_sg, 269 int in_sg_len, int out_sg_len) 270 { 271 struct dma_async_tx_descriptor *tx_in, *tx_out = NULL, *cb_desc; 272 struct dma_slave_config cfg; 273 int ret; 274 275 if (dd->pio_only) { 276 scatterwalk_start(&dd->in_walk, dd->in_sg); 277 if (out_sg_len) 278 scatterwalk_start(&dd->out_walk, dd->out_sg); 279 280 /* Enable DATAIN interrupt and let it take 281 care of the rest */ 282 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x2); 283 return 0; 284 } 285 286 dma_sync_sg_for_device(dd->dev, dd->in_sg, in_sg_len, DMA_TO_DEVICE); 287 288 memset(&cfg, 0, sizeof(cfg)); 289 290 cfg.src_addr = dd->phys_base + AES_REG_DATA_N(dd, 0); 291 cfg.dst_addr = dd->phys_base + AES_REG_DATA_N(dd, 0); 292 cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; 293 cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; 294 cfg.src_maxburst = DST_MAXBURST; 295 cfg.dst_maxburst = DST_MAXBURST; 296 297 /* IN */ 298 ret = dmaengine_slave_config(dd->dma_lch_in, &cfg); 299 if (ret) { 300 dev_err(dd->dev, "can't configure IN dmaengine slave: %d\n", 301 ret); 302 return ret; 303 } 304 305 tx_in = dmaengine_prep_slave_sg(dd->dma_lch_in, in_sg, in_sg_len, 306 DMA_MEM_TO_DEV, 307 DMA_PREP_INTERRUPT | DMA_CTRL_ACK); 308 if (!tx_in) { 309 dev_err(dd->dev, "IN prep_slave_sg() failed\n"); 310 return -EINVAL; 311 } 312 313 /* No callback necessary */ 314 tx_in->callback_param = dd; 315 tx_in->callback = NULL; 316 317 /* OUT */ 318 if (out_sg_len) { 319 ret = dmaengine_slave_config(dd->dma_lch_out, &cfg); 320 if (ret) { 321 dev_err(dd->dev, "can't configure OUT dmaengine slave: %d\n", 322 ret); 323 return ret; 324 } 325 326 tx_out = dmaengine_prep_slave_sg(dd->dma_lch_out, out_sg, 327 out_sg_len, 328 DMA_DEV_TO_MEM, 329 DMA_PREP_INTERRUPT | DMA_CTRL_ACK); 330 if (!tx_out) { 331 dev_err(dd->dev, "OUT prep_slave_sg() failed\n"); 332 return -EINVAL; 333 } 334 335 cb_desc = tx_out; 336 } else { 337 cb_desc = tx_in; 338 } 339 340 if (dd->flags & FLAGS_GCM) 341 cb_desc->callback = omap_aes_gcm_dma_out_callback; 342 else 343 cb_desc->callback = omap_aes_dma_out_callback; 344 cb_desc->callback_param = dd; 345 346 347 dmaengine_submit(tx_in); 348 if (tx_out) 349 dmaengine_submit(tx_out); 350 351 dma_async_issue_pending(dd->dma_lch_in); 352 if (out_sg_len) 353 dma_async_issue_pending(dd->dma_lch_out); 354 355 /* start DMA */ 356 dd->pdata->trigger(dd, dd->total); 357 358 return 0; 359 } 360 361 int omap_aes_crypt_dma_start(struct omap_aes_dev *dd) 362 { 363 int err; 364 365 pr_debug("total: %zu\n", dd->total); 366 367 if (!dd->pio_only) { 368 err = dma_map_sg(dd->dev, dd->in_sg, dd->in_sg_len, 369 DMA_TO_DEVICE); 370 if (!err) { 371 dev_err(dd->dev, "dma_map_sg() error\n"); 372 return -EINVAL; 373 } 374 375 if (dd->out_sg_len) { 376 err = dma_map_sg(dd->dev, dd->out_sg, dd->out_sg_len, 377 DMA_FROM_DEVICE); 378 if (!err) { 379 dev_err(dd->dev, "dma_map_sg() error\n"); 380 return -EINVAL; 381 } 382 } 383 } 384 385 err = omap_aes_crypt_dma(dd, dd->in_sg, dd->out_sg, dd->in_sg_len, 386 dd->out_sg_len); 387 if (err && !dd->pio_only) { 388 dma_unmap_sg(dd->dev, dd->in_sg, dd->in_sg_len, DMA_TO_DEVICE); 389 if (dd->out_sg_len) 390 dma_unmap_sg(dd->dev, dd->out_sg, dd->out_sg_len, 391 DMA_FROM_DEVICE); 392 } 393 394 return err; 395 } 396 397 static void omap_aes_finish_req(struct omap_aes_dev *dd, int err) 398 { 399 struct skcipher_request *req = dd->req; 400 401 pr_debug("err: %d\n", err); 402 403 crypto_finalize_skcipher_request(dd->engine, req, err); 404 405 pm_runtime_mark_last_busy(dd->dev); 406 pm_runtime_put_autosuspend(dd->dev); 407 } 408 409 int omap_aes_crypt_dma_stop(struct omap_aes_dev *dd) 410 { 411 pr_debug("total: %zu\n", dd->total); 412 413 omap_aes_dma_stop(dd); 414 415 416 return 0; 417 } 418 419 static int omap_aes_handle_queue(struct omap_aes_dev *dd, 420 struct skcipher_request *req) 421 { 422 if (req) 423 return crypto_transfer_skcipher_request_to_engine(dd->engine, req); 424 425 return 0; 426 } 427 428 static int omap_aes_prepare_req(struct skcipher_request *req, 429 struct omap_aes_dev *dd) 430 { 431 struct omap_aes_ctx *ctx = crypto_skcipher_ctx( 432 crypto_skcipher_reqtfm(req)); 433 struct omap_aes_reqctx *rctx = skcipher_request_ctx(req); 434 int ret; 435 u16 flags; 436 437 /* assign new request to device */ 438 dd->req = req; 439 dd->total = req->cryptlen; 440 dd->total_save = req->cryptlen; 441 dd->in_sg = req->src; 442 dd->out_sg = req->dst; 443 dd->orig_out = req->dst; 444 445 flags = OMAP_CRYPTO_COPY_DATA; 446 if (req->src == req->dst) 447 flags |= OMAP_CRYPTO_FORCE_COPY; 448 449 ret = omap_crypto_align_sg(&dd->in_sg, dd->total, AES_BLOCK_SIZE, 450 dd->in_sgl, flags, 451 FLAGS_IN_DATA_ST_SHIFT, &dd->flags); 452 if (ret) 453 return ret; 454 455 ret = omap_crypto_align_sg(&dd->out_sg, dd->total, AES_BLOCK_SIZE, 456 &dd->out_sgl, 0, 457 FLAGS_OUT_DATA_ST_SHIFT, &dd->flags); 458 if (ret) 459 return ret; 460 461 dd->in_sg_len = sg_nents_for_len(dd->in_sg, dd->total); 462 if (dd->in_sg_len < 0) 463 return dd->in_sg_len; 464 465 dd->out_sg_len = sg_nents_for_len(dd->out_sg, dd->total); 466 if (dd->out_sg_len < 0) 467 return dd->out_sg_len; 468 469 rctx->mode &= FLAGS_MODE_MASK; 470 dd->flags = (dd->flags & ~FLAGS_MODE_MASK) | rctx->mode; 471 472 dd->ctx = ctx; 473 rctx->dd = dd; 474 475 return omap_aes_write_ctrl(dd); 476 } 477 478 static int omap_aes_crypt_req(struct crypto_engine *engine, 479 void *areq) 480 { 481 struct skcipher_request *req = container_of(areq, struct skcipher_request, base); 482 struct omap_aes_reqctx *rctx = skcipher_request_ctx(req); 483 struct omap_aes_dev *dd = rctx->dd; 484 485 if (!dd) 486 return -ENODEV; 487 488 return omap_aes_prepare_req(req, dd) ?: 489 omap_aes_crypt_dma_start(dd); 490 } 491 492 static void omap_aes_copy_ivout(struct omap_aes_dev *dd, u8 *ivbuf) 493 { 494 int i; 495 496 for (i = 0; i < 4; i++) 497 ((u32 *)ivbuf)[i] = omap_aes_read(dd, AES_REG_IV(dd, i)); 498 } 499 500 static void omap_aes_done_task(unsigned long data) 501 { 502 struct omap_aes_dev *dd = (struct omap_aes_dev *)data; 503 504 pr_debug("enter done_task\n"); 505 506 if (!dd->pio_only) { 507 dma_sync_sg_for_device(dd->dev, dd->out_sg, dd->out_sg_len, 508 DMA_FROM_DEVICE); 509 dma_unmap_sg(dd->dev, dd->in_sg, dd->in_sg_len, DMA_TO_DEVICE); 510 dma_unmap_sg(dd->dev, dd->out_sg, dd->out_sg_len, 511 DMA_FROM_DEVICE); 512 omap_aes_crypt_dma_stop(dd); 513 } 514 515 omap_crypto_cleanup(dd->in_sg, NULL, 0, dd->total_save, 516 FLAGS_IN_DATA_ST_SHIFT, dd->flags); 517 518 omap_crypto_cleanup(dd->out_sg, dd->orig_out, 0, dd->total_save, 519 FLAGS_OUT_DATA_ST_SHIFT, dd->flags); 520 521 /* Update IV output */ 522 if (dd->flags & (FLAGS_CBC | FLAGS_CTR)) 523 omap_aes_copy_ivout(dd, dd->req->iv); 524 525 omap_aes_finish_req(dd, 0); 526 527 pr_debug("exit\n"); 528 } 529 530 static int omap_aes_crypt(struct skcipher_request *req, unsigned long mode) 531 { 532 struct omap_aes_ctx *ctx = crypto_skcipher_ctx( 533 crypto_skcipher_reqtfm(req)); 534 struct omap_aes_reqctx *rctx = skcipher_request_ctx(req); 535 struct omap_aes_dev *dd; 536 int ret; 537 538 if ((req->cryptlen % AES_BLOCK_SIZE) && !(mode & FLAGS_CTR)) 539 return -EINVAL; 540 541 pr_debug("nbytes: %d, enc: %d, cbc: %d\n", req->cryptlen, 542 !!(mode & FLAGS_ENCRYPT), 543 !!(mode & FLAGS_CBC)); 544 545 if (req->cryptlen < aes_fallback_sz) { 546 skcipher_request_set_tfm(&rctx->fallback_req, ctx->fallback); 547 skcipher_request_set_callback(&rctx->fallback_req, 548 req->base.flags, 549 req->base.complete, 550 req->base.data); 551 skcipher_request_set_crypt(&rctx->fallback_req, req->src, 552 req->dst, req->cryptlen, req->iv); 553 554 if (mode & FLAGS_ENCRYPT) 555 ret = crypto_skcipher_encrypt(&rctx->fallback_req); 556 else 557 ret = crypto_skcipher_decrypt(&rctx->fallback_req); 558 return ret; 559 } 560 dd = omap_aes_find_dev(rctx); 561 if (!dd) 562 return -ENODEV; 563 564 rctx->mode = mode; 565 566 return omap_aes_handle_queue(dd, req); 567 } 568 569 /* ********************** ALG API ************************************ */ 570 571 static int omap_aes_setkey(struct crypto_skcipher *tfm, const u8 *key, 572 unsigned int keylen) 573 { 574 struct omap_aes_ctx *ctx = crypto_skcipher_ctx(tfm); 575 int ret; 576 577 if (keylen != AES_KEYSIZE_128 && keylen != AES_KEYSIZE_192 && 578 keylen != AES_KEYSIZE_256) 579 return -EINVAL; 580 581 pr_debug("enter, keylen: %d\n", keylen); 582 583 memcpy(ctx->key, key, keylen); 584 ctx->keylen = keylen; 585 586 crypto_skcipher_clear_flags(ctx->fallback, CRYPTO_TFM_REQ_MASK); 587 crypto_skcipher_set_flags(ctx->fallback, tfm->base.crt_flags & 588 CRYPTO_TFM_REQ_MASK); 589 590 ret = crypto_skcipher_setkey(ctx->fallback, key, keylen); 591 if (!ret) 592 return 0; 593 594 return 0; 595 } 596 597 static int omap_aes_ecb_encrypt(struct skcipher_request *req) 598 { 599 return omap_aes_crypt(req, FLAGS_ENCRYPT); 600 } 601 602 static int omap_aes_ecb_decrypt(struct skcipher_request *req) 603 { 604 return omap_aes_crypt(req, 0); 605 } 606 607 static int omap_aes_cbc_encrypt(struct skcipher_request *req) 608 { 609 return omap_aes_crypt(req, FLAGS_ENCRYPT | FLAGS_CBC); 610 } 611 612 static int omap_aes_cbc_decrypt(struct skcipher_request *req) 613 { 614 return omap_aes_crypt(req, FLAGS_CBC); 615 } 616 617 static int omap_aes_ctr_encrypt(struct skcipher_request *req) 618 { 619 return omap_aes_crypt(req, FLAGS_ENCRYPT | FLAGS_CTR); 620 } 621 622 static int omap_aes_ctr_decrypt(struct skcipher_request *req) 623 { 624 return omap_aes_crypt(req, FLAGS_CTR); 625 } 626 627 static int omap_aes_init_tfm(struct crypto_skcipher *tfm) 628 { 629 const char *name = crypto_tfm_alg_name(&tfm->base); 630 struct omap_aes_ctx *ctx = crypto_skcipher_ctx(tfm); 631 struct crypto_skcipher *blk; 632 633 blk = crypto_alloc_skcipher(name, 0, CRYPTO_ALG_NEED_FALLBACK); 634 if (IS_ERR(blk)) 635 return PTR_ERR(blk); 636 637 ctx->fallback = blk; 638 639 crypto_skcipher_set_reqsize(tfm, sizeof(struct omap_aes_reqctx) + 640 crypto_skcipher_reqsize(blk)); 641 642 return 0; 643 } 644 645 static void omap_aes_exit_tfm(struct crypto_skcipher *tfm) 646 { 647 struct omap_aes_ctx *ctx = crypto_skcipher_ctx(tfm); 648 649 if (ctx->fallback) 650 crypto_free_skcipher(ctx->fallback); 651 652 ctx->fallback = NULL; 653 } 654 655 /* ********************** ALGS ************************************ */ 656 657 static struct skcipher_engine_alg algs_ecb_cbc[] = { 658 { 659 .base = { 660 .base.cra_name = "ecb(aes)", 661 .base.cra_driver_name = "ecb-aes-omap", 662 .base.cra_priority = 300, 663 .base.cra_flags = CRYPTO_ALG_KERN_DRIVER_ONLY | 664 CRYPTO_ALG_ASYNC | 665 CRYPTO_ALG_NEED_FALLBACK, 666 .base.cra_blocksize = AES_BLOCK_SIZE, 667 .base.cra_ctxsize = sizeof(struct omap_aes_ctx), 668 .base.cra_module = THIS_MODULE, 669 670 .min_keysize = AES_MIN_KEY_SIZE, 671 .max_keysize = AES_MAX_KEY_SIZE, 672 .setkey = omap_aes_setkey, 673 .encrypt = omap_aes_ecb_encrypt, 674 .decrypt = omap_aes_ecb_decrypt, 675 .init = omap_aes_init_tfm, 676 .exit = omap_aes_exit_tfm, 677 }, 678 .op.do_one_request = omap_aes_crypt_req, 679 }, 680 { 681 .base = { 682 .base.cra_name = "cbc(aes)", 683 .base.cra_driver_name = "cbc-aes-omap", 684 .base.cra_priority = 300, 685 .base.cra_flags = CRYPTO_ALG_KERN_DRIVER_ONLY | 686 CRYPTO_ALG_ASYNC | 687 CRYPTO_ALG_NEED_FALLBACK, 688 .base.cra_blocksize = AES_BLOCK_SIZE, 689 .base.cra_ctxsize = sizeof(struct omap_aes_ctx), 690 .base.cra_module = THIS_MODULE, 691 692 .min_keysize = AES_MIN_KEY_SIZE, 693 .max_keysize = AES_MAX_KEY_SIZE, 694 .ivsize = AES_BLOCK_SIZE, 695 .setkey = omap_aes_setkey, 696 .encrypt = omap_aes_cbc_encrypt, 697 .decrypt = omap_aes_cbc_decrypt, 698 .init = omap_aes_init_tfm, 699 .exit = omap_aes_exit_tfm, 700 }, 701 .op.do_one_request = omap_aes_crypt_req, 702 } 703 }; 704 705 static struct skcipher_engine_alg algs_ctr[] = { 706 { 707 .base = { 708 .base.cra_name = "ctr(aes)", 709 .base.cra_driver_name = "ctr-aes-omap", 710 .base.cra_priority = 300, 711 .base.cra_flags = CRYPTO_ALG_KERN_DRIVER_ONLY | 712 CRYPTO_ALG_ASYNC | 713 CRYPTO_ALG_NEED_FALLBACK, 714 .base.cra_blocksize = 1, 715 .base.cra_ctxsize = sizeof(struct omap_aes_ctx), 716 .base.cra_module = THIS_MODULE, 717 718 .min_keysize = AES_MIN_KEY_SIZE, 719 .max_keysize = AES_MAX_KEY_SIZE, 720 .ivsize = AES_BLOCK_SIZE, 721 .setkey = omap_aes_setkey, 722 .encrypt = omap_aes_ctr_encrypt, 723 .decrypt = omap_aes_ctr_decrypt, 724 .init = omap_aes_init_tfm, 725 .exit = omap_aes_exit_tfm, 726 }, 727 .op.do_one_request = omap_aes_crypt_req, 728 } 729 }; 730 731 static struct omap_aes_algs_info omap_aes_algs_info_ecb_cbc[] = { 732 { 733 .algs_list = algs_ecb_cbc, 734 .size = ARRAY_SIZE(algs_ecb_cbc), 735 }, 736 }; 737 738 static struct aead_engine_alg algs_aead_gcm[] = { 739 { 740 .base = { 741 .base = { 742 .cra_name = "gcm(aes)", 743 .cra_driver_name = "gcm-aes-omap", 744 .cra_priority = 300, 745 .cra_flags = CRYPTO_ALG_ASYNC | 746 CRYPTO_ALG_KERN_DRIVER_ONLY, 747 .cra_blocksize = 1, 748 .cra_ctxsize = sizeof(struct omap_aes_gcm_ctx), 749 .cra_alignmask = 0xf, 750 .cra_module = THIS_MODULE, 751 }, 752 .init = omap_aes_gcm_cra_init, 753 .ivsize = GCM_AES_IV_SIZE, 754 .maxauthsize = AES_BLOCK_SIZE, 755 .setkey = omap_aes_gcm_setkey, 756 .setauthsize = omap_aes_gcm_setauthsize, 757 .encrypt = omap_aes_gcm_encrypt, 758 .decrypt = omap_aes_gcm_decrypt, 759 }, 760 .op.do_one_request = omap_aes_gcm_crypt_req, 761 }, 762 { 763 .base = { 764 .base = { 765 .cra_name = "rfc4106(gcm(aes))", 766 .cra_driver_name = "rfc4106-gcm-aes-omap", 767 .cra_priority = 300, 768 .cra_flags = CRYPTO_ALG_ASYNC | 769 CRYPTO_ALG_KERN_DRIVER_ONLY, 770 .cra_blocksize = 1, 771 .cra_ctxsize = sizeof(struct omap_aes_gcm_ctx), 772 .cra_alignmask = 0xf, 773 .cra_module = THIS_MODULE, 774 }, 775 .init = omap_aes_gcm_cra_init, 776 .maxauthsize = AES_BLOCK_SIZE, 777 .ivsize = GCM_RFC4106_IV_SIZE, 778 .setkey = omap_aes_4106gcm_setkey, 779 .setauthsize = omap_aes_4106gcm_setauthsize, 780 .encrypt = omap_aes_4106gcm_encrypt, 781 .decrypt = omap_aes_4106gcm_decrypt, 782 }, 783 .op.do_one_request = omap_aes_gcm_crypt_req, 784 }, 785 }; 786 787 static struct omap_aes_aead_algs omap_aes_aead_info = { 788 .algs_list = algs_aead_gcm, 789 .size = ARRAY_SIZE(algs_aead_gcm), 790 }; 791 792 static const struct omap_aes_pdata omap_aes_pdata_omap2 = { 793 .algs_info = omap_aes_algs_info_ecb_cbc, 794 .algs_info_size = ARRAY_SIZE(omap_aes_algs_info_ecb_cbc), 795 .trigger = omap_aes_dma_trigger_omap2, 796 .key_ofs = 0x1c, 797 .iv_ofs = 0x20, 798 .ctrl_ofs = 0x30, 799 .data_ofs = 0x34, 800 .rev_ofs = 0x44, 801 .mask_ofs = 0x48, 802 .dma_enable_in = BIT(2), 803 .dma_enable_out = BIT(3), 804 .dma_start = BIT(5), 805 .major_mask = 0xf0, 806 .major_shift = 4, 807 .minor_mask = 0x0f, 808 .minor_shift = 0, 809 }; 810 811 #ifdef CONFIG_OF 812 static struct omap_aes_algs_info omap_aes_algs_info_ecb_cbc_ctr[] = { 813 { 814 .algs_list = algs_ecb_cbc, 815 .size = ARRAY_SIZE(algs_ecb_cbc), 816 }, 817 { 818 .algs_list = algs_ctr, 819 .size = ARRAY_SIZE(algs_ctr), 820 }, 821 }; 822 823 static const struct omap_aes_pdata omap_aes_pdata_omap3 = { 824 .algs_info = omap_aes_algs_info_ecb_cbc_ctr, 825 .algs_info_size = ARRAY_SIZE(omap_aes_algs_info_ecb_cbc_ctr), 826 .trigger = omap_aes_dma_trigger_omap2, 827 .key_ofs = 0x1c, 828 .iv_ofs = 0x20, 829 .ctrl_ofs = 0x30, 830 .data_ofs = 0x34, 831 .rev_ofs = 0x44, 832 .mask_ofs = 0x48, 833 .dma_enable_in = BIT(2), 834 .dma_enable_out = BIT(3), 835 .dma_start = BIT(5), 836 .major_mask = 0xf0, 837 .major_shift = 4, 838 .minor_mask = 0x0f, 839 .minor_shift = 0, 840 }; 841 842 static const struct omap_aes_pdata omap_aes_pdata_omap4 = { 843 .algs_info = omap_aes_algs_info_ecb_cbc_ctr, 844 .algs_info_size = ARRAY_SIZE(omap_aes_algs_info_ecb_cbc_ctr), 845 .aead_algs_info = &omap_aes_aead_info, 846 .trigger = omap_aes_dma_trigger_omap4, 847 .key_ofs = 0x3c, 848 .iv_ofs = 0x40, 849 .ctrl_ofs = 0x50, 850 .data_ofs = 0x60, 851 .rev_ofs = 0x80, 852 .mask_ofs = 0x84, 853 .irq_status_ofs = 0x8c, 854 .irq_enable_ofs = 0x90, 855 .dma_enable_in = BIT(5), 856 .dma_enable_out = BIT(6), 857 .major_mask = 0x0700, 858 .major_shift = 8, 859 .minor_mask = 0x003f, 860 .minor_shift = 0, 861 }; 862 863 static irqreturn_t omap_aes_irq(int irq, void *dev_id) 864 { 865 struct omap_aes_dev *dd = dev_id; 866 u32 status, i; 867 u32 *src, *dst; 868 869 status = omap_aes_read(dd, AES_REG_IRQ_STATUS(dd)); 870 if (status & AES_REG_IRQ_DATA_IN) { 871 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x0); 872 873 BUG_ON(!dd->in_sg); 874 875 BUG_ON(_calc_walked(in) > dd->in_sg->length); 876 877 src = sg_virt(dd->in_sg) + _calc_walked(in); 878 879 for (i = 0; i < AES_BLOCK_WORDS; i++) { 880 omap_aes_write(dd, AES_REG_DATA_N(dd, i), *src); 881 882 scatterwalk_advance(&dd->in_walk, 4); 883 if (dd->in_sg->length == _calc_walked(in)) { 884 dd->in_sg = sg_next(dd->in_sg); 885 if (dd->in_sg) { 886 scatterwalk_start(&dd->in_walk, 887 dd->in_sg); 888 src = sg_virt(dd->in_sg) + 889 _calc_walked(in); 890 } 891 } else { 892 src++; 893 } 894 } 895 896 /* Clear IRQ status */ 897 status &= ~AES_REG_IRQ_DATA_IN; 898 omap_aes_write(dd, AES_REG_IRQ_STATUS(dd), status); 899 900 /* Enable DATA_OUT interrupt */ 901 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x4); 902 903 } else if (status & AES_REG_IRQ_DATA_OUT) { 904 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x0); 905 906 BUG_ON(!dd->out_sg); 907 908 BUG_ON(_calc_walked(out) > dd->out_sg->length); 909 910 dst = sg_virt(dd->out_sg) + _calc_walked(out); 911 912 for (i = 0; i < AES_BLOCK_WORDS; i++) { 913 *dst = omap_aes_read(dd, AES_REG_DATA_N(dd, i)); 914 scatterwalk_advance(&dd->out_walk, 4); 915 if (dd->out_sg->length == _calc_walked(out)) { 916 dd->out_sg = sg_next(dd->out_sg); 917 if (dd->out_sg) { 918 scatterwalk_start(&dd->out_walk, 919 dd->out_sg); 920 dst = sg_virt(dd->out_sg) + 921 _calc_walked(out); 922 } 923 } else { 924 dst++; 925 } 926 } 927 928 dd->total -= min_t(size_t, AES_BLOCK_SIZE, dd->total); 929 930 /* Clear IRQ status */ 931 status &= ~AES_REG_IRQ_DATA_OUT; 932 omap_aes_write(dd, AES_REG_IRQ_STATUS(dd), status); 933 934 if (!dd->total) 935 /* All bytes read! */ 936 tasklet_schedule(&dd->done_task); 937 else 938 /* Enable DATA_IN interrupt for next block */ 939 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x2); 940 } 941 942 return IRQ_HANDLED; 943 } 944 945 static const struct of_device_id omap_aes_of_match[] = { 946 { 947 .compatible = "ti,omap2-aes", 948 .data = &omap_aes_pdata_omap2, 949 }, 950 { 951 .compatible = "ti,omap3-aes", 952 .data = &omap_aes_pdata_omap3, 953 }, 954 { 955 .compatible = "ti,omap4-aes", 956 .data = &omap_aes_pdata_omap4, 957 }, 958 {}, 959 }; 960 MODULE_DEVICE_TABLE(of, omap_aes_of_match); 961 962 static int omap_aes_get_res_of(struct omap_aes_dev *dd, 963 struct device *dev, struct resource *res) 964 { 965 struct device_node *node = dev->of_node; 966 int err = 0; 967 968 dd->pdata = of_device_get_match_data(dev); 969 if (!dd->pdata) { 970 dev_err(dev, "no compatible OF match\n"); 971 err = -EINVAL; 972 goto err; 973 } 974 975 err = of_address_to_resource(node, 0, res); 976 if (err < 0) { 977 dev_err(dev, "can't translate OF node address\n"); 978 err = -EINVAL; 979 goto err; 980 } 981 982 err: 983 return err; 984 } 985 #else 986 static const struct of_device_id omap_aes_of_match[] = { 987 {}, 988 }; 989 990 static int omap_aes_get_res_of(struct omap_aes_dev *dd, 991 struct device *dev, struct resource *res) 992 { 993 return -EINVAL; 994 } 995 #endif 996 997 static int omap_aes_get_res_pdev(struct omap_aes_dev *dd, 998 struct platform_device *pdev, struct resource *res) 999 { 1000 struct device *dev = &pdev->dev; 1001 struct resource *r; 1002 int err = 0; 1003 1004 /* Get the base address */ 1005 r = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1006 if (!r) { 1007 dev_err(dev, "no MEM resource info\n"); 1008 err = -ENODEV; 1009 goto err; 1010 } 1011 memcpy(res, r, sizeof(*res)); 1012 1013 /* Only OMAP2/3 can be non-DT */ 1014 dd->pdata = &omap_aes_pdata_omap2; 1015 1016 err: 1017 return err; 1018 } 1019 1020 static ssize_t fallback_show(struct device *dev, struct device_attribute *attr, 1021 char *buf) 1022 { 1023 return sprintf(buf, "%d\n", aes_fallback_sz); 1024 } 1025 1026 static ssize_t fallback_store(struct device *dev, struct device_attribute *attr, 1027 const char *buf, size_t size) 1028 { 1029 ssize_t status; 1030 long value; 1031 1032 status = kstrtol(buf, 0, &value); 1033 if (status) 1034 return status; 1035 1036 /* HW accelerator only works with buffers > 9 */ 1037 if (value < 9) { 1038 dev_err(dev, "minimum fallback size 9\n"); 1039 return -EINVAL; 1040 } 1041 1042 aes_fallback_sz = value; 1043 1044 return size; 1045 } 1046 1047 static ssize_t queue_len_show(struct device *dev, struct device_attribute *attr, 1048 char *buf) 1049 { 1050 struct omap_aes_dev *dd = dev_get_drvdata(dev); 1051 1052 return sprintf(buf, "%d\n", dd->engine->queue.max_qlen); 1053 } 1054 1055 static ssize_t queue_len_store(struct device *dev, 1056 struct device_attribute *attr, const char *buf, 1057 size_t size) 1058 { 1059 struct omap_aes_dev *dd; 1060 ssize_t status; 1061 long value; 1062 unsigned long flags; 1063 1064 status = kstrtol(buf, 0, &value); 1065 if (status) 1066 return status; 1067 1068 if (value < 1) 1069 return -EINVAL; 1070 1071 /* 1072 * Changing the queue size in fly is safe, if size becomes smaller 1073 * than current size, it will just not accept new entries until 1074 * it has shrank enough. 1075 */ 1076 spin_lock_bh(&list_lock); 1077 list_for_each_entry(dd, &dev_list, list) { 1078 spin_lock_irqsave(&dd->lock, flags); 1079 dd->engine->queue.max_qlen = value; 1080 dd->aead_queue.base.max_qlen = value; 1081 spin_unlock_irqrestore(&dd->lock, flags); 1082 } 1083 spin_unlock_bh(&list_lock); 1084 1085 return size; 1086 } 1087 1088 static DEVICE_ATTR_RW(queue_len); 1089 static DEVICE_ATTR_RW(fallback); 1090 1091 static struct attribute *omap_aes_attrs[] = { 1092 &dev_attr_queue_len.attr, 1093 &dev_attr_fallback.attr, 1094 NULL, 1095 }; 1096 1097 static const struct attribute_group omap_aes_attr_group = { 1098 .attrs = omap_aes_attrs, 1099 }; 1100 1101 static int omap_aes_probe(struct platform_device *pdev) 1102 { 1103 struct device *dev = &pdev->dev; 1104 struct omap_aes_dev *dd; 1105 struct skcipher_engine_alg *algp; 1106 struct aead_engine_alg *aalg; 1107 struct resource res; 1108 int err = -ENOMEM, i, j, irq = -1; 1109 u32 reg; 1110 1111 dd = devm_kzalloc(dev, sizeof(struct omap_aes_dev), GFP_KERNEL); 1112 if (dd == NULL) { 1113 dev_err(dev, "unable to alloc data struct.\n"); 1114 goto err_data; 1115 } 1116 dd->dev = dev; 1117 platform_set_drvdata(pdev, dd); 1118 1119 aead_init_queue(&dd->aead_queue, OMAP_AES_QUEUE_LENGTH); 1120 1121 err = (dev->of_node) ? omap_aes_get_res_of(dd, dev, &res) : 1122 omap_aes_get_res_pdev(dd, pdev, &res); 1123 if (err) 1124 goto err_res; 1125 1126 dd->io_base = devm_ioremap_resource(dev, &res); 1127 if (IS_ERR(dd->io_base)) { 1128 err = PTR_ERR(dd->io_base); 1129 goto err_res; 1130 } 1131 dd->phys_base = res.start; 1132 1133 pm_runtime_use_autosuspend(dev); 1134 pm_runtime_set_autosuspend_delay(dev, DEFAULT_AUTOSUSPEND_DELAY); 1135 1136 pm_runtime_enable(dev); 1137 err = pm_runtime_resume_and_get(dev); 1138 if (err < 0) { 1139 dev_err(dev, "%s: failed to get_sync(%d)\n", 1140 __func__, err); 1141 goto err_pm_disable; 1142 } 1143 1144 omap_aes_dma_stop(dd); 1145 1146 reg = omap_aes_read(dd, AES_REG_REV(dd)); 1147 1148 pm_runtime_put_sync(dev); 1149 1150 dev_info(dev, "OMAP AES hw accel rev: %u.%u\n", 1151 (reg & dd->pdata->major_mask) >> dd->pdata->major_shift, 1152 (reg & dd->pdata->minor_mask) >> dd->pdata->minor_shift); 1153 1154 tasklet_init(&dd->done_task, omap_aes_done_task, (unsigned long)dd); 1155 1156 err = omap_aes_dma_init(dd); 1157 if (err == -EPROBE_DEFER) { 1158 goto err_irq; 1159 } else if (err && AES_REG_IRQ_STATUS(dd) && AES_REG_IRQ_ENABLE(dd)) { 1160 dd->pio_only = 1; 1161 1162 irq = platform_get_irq(pdev, 0); 1163 if (irq < 0) { 1164 err = irq; 1165 goto err_irq; 1166 } 1167 1168 err = devm_request_irq(dev, irq, omap_aes_irq, 0, 1169 dev_name(dev), dd); 1170 if (err) { 1171 dev_err(dev, "Unable to grab omap-aes IRQ\n"); 1172 goto err_irq; 1173 } 1174 } 1175 1176 spin_lock_init(&dd->lock); 1177 1178 INIT_LIST_HEAD(&dd->list); 1179 spin_lock_bh(&list_lock); 1180 list_add_tail(&dd->list, &dev_list); 1181 spin_unlock_bh(&list_lock); 1182 1183 /* Initialize crypto engine */ 1184 dd->engine = crypto_engine_alloc_init(dev, 1); 1185 if (!dd->engine) { 1186 err = -ENOMEM; 1187 goto err_engine; 1188 } 1189 1190 err = crypto_engine_start(dd->engine); 1191 if (err) 1192 goto err_engine; 1193 1194 for (i = 0; i < dd->pdata->algs_info_size; i++) { 1195 if (!dd->pdata->algs_info[i].registered) { 1196 for (j = 0; j < dd->pdata->algs_info[i].size; j++) { 1197 algp = &dd->pdata->algs_info[i].algs_list[j]; 1198 1199 pr_debug("reg alg: %s\n", algp->base.base.cra_name); 1200 1201 err = crypto_engine_register_skcipher(algp); 1202 if (err) 1203 goto err_algs; 1204 1205 dd->pdata->algs_info[i].registered++; 1206 } 1207 } 1208 } 1209 1210 if (dd->pdata->aead_algs_info && 1211 !dd->pdata->aead_algs_info->registered) { 1212 for (i = 0; i < dd->pdata->aead_algs_info->size; i++) { 1213 aalg = &dd->pdata->aead_algs_info->algs_list[i]; 1214 1215 pr_debug("reg alg: %s\n", aalg->base.base.cra_name); 1216 1217 err = crypto_engine_register_aead(aalg); 1218 if (err) 1219 goto err_aead_algs; 1220 1221 dd->pdata->aead_algs_info->registered++; 1222 } 1223 } 1224 1225 err = sysfs_create_group(&dev->kobj, &omap_aes_attr_group); 1226 if (err) { 1227 dev_err(dev, "could not create sysfs device attrs\n"); 1228 goto err_aead_algs; 1229 } 1230 1231 return 0; 1232 err_aead_algs: 1233 for (i = dd->pdata->aead_algs_info->registered - 1; i >= 0; i--) { 1234 aalg = &dd->pdata->aead_algs_info->algs_list[i]; 1235 crypto_engine_unregister_aead(aalg); 1236 } 1237 err_algs: 1238 for (i = dd->pdata->algs_info_size - 1; i >= 0; i--) 1239 for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--) 1240 crypto_engine_unregister_skcipher( 1241 &dd->pdata->algs_info[i].algs_list[j]); 1242 1243 err_engine: 1244 if (dd->engine) 1245 crypto_engine_exit(dd->engine); 1246 1247 omap_aes_dma_cleanup(dd); 1248 err_irq: 1249 tasklet_kill(&dd->done_task); 1250 err_pm_disable: 1251 pm_runtime_disable(dev); 1252 err_res: 1253 dd = NULL; 1254 err_data: 1255 dev_err(dev, "initialization failed.\n"); 1256 return err; 1257 } 1258 1259 static int omap_aes_remove(struct platform_device *pdev) 1260 { 1261 struct omap_aes_dev *dd = platform_get_drvdata(pdev); 1262 struct aead_engine_alg *aalg; 1263 int i, j; 1264 1265 spin_lock_bh(&list_lock); 1266 list_del(&dd->list); 1267 spin_unlock_bh(&list_lock); 1268 1269 for (i = dd->pdata->algs_info_size - 1; i >= 0; i--) 1270 for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--) { 1271 crypto_engine_unregister_skcipher( 1272 &dd->pdata->algs_info[i].algs_list[j]); 1273 dd->pdata->algs_info[i].registered--; 1274 } 1275 1276 for (i = dd->pdata->aead_algs_info->registered - 1; i >= 0; i--) { 1277 aalg = &dd->pdata->aead_algs_info->algs_list[i]; 1278 crypto_engine_unregister_aead(aalg); 1279 dd->pdata->aead_algs_info->registered--; 1280 } 1281 1282 crypto_engine_exit(dd->engine); 1283 1284 tasklet_kill(&dd->done_task); 1285 omap_aes_dma_cleanup(dd); 1286 pm_runtime_disable(dd->dev); 1287 1288 sysfs_remove_group(&dd->dev->kobj, &omap_aes_attr_group); 1289 1290 return 0; 1291 } 1292 1293 #ifdef CONFIG_PM_SLEEP 1294 static int omap_aes_suspend(struct device *dev) 1295 { 1296 pm_runtime_put_sync(dev); 1297 return 0; 1298 } 1299 1300 static int omap_aes_resume(struct device *dev) 1301 { 1302 pm_runtime_get_sync(dev); 1303 return 0; 1304 } 1305 #endif 1306 1307 static SIMPLE_DEV_PM_OPS(omap_aes_pm_ops, omap_aes_suspend, omap_aes_resume); 1308 1309 static struct platform_driver omap_aes_driver = { 1310 .probe = omap_aes_probe, 1311 .remove = omap_aes_remove, 1312 .driver = { 1313 .name = "omap-aes", 1314 .pm = &omap_aes_pm_ops, 1315 .of_match_table = omap_aes_of_match, 1316 }, 1317 }; 1318 1319 module_platform_driver(omap_aes_driver); 1320 1321 MODULE_DESCRIPTION("OMAP AES hw acceleration support."); 1322 MODULE_LICENSE("GPL v2"); 1323 MODULE_AUTHOR("Dmitry Kasatkin"); 1324 1325