1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Cryptographic API. 4 * 5 * Support for ATMEL DES/TDES HW acceleration. 6 * 7 * Copyright (c) 2012 Eukréa Electromatique - ATMEL 8 * Author: Nicolas Royer <nicolas@eukrea.com> 9 * 10 * Some ideas are from omap-aes.c drivers. 11 */ 12 13 14 #include <linux/kernel.h> 15 #include <linux/module.h> 16 #include <linux/slab.h> 17 #include <linux/err.h> 18 #include <linux/clk.h> 19 #include <linux/io.h> 20 #include <linux/hw_random.h> 21 #include <linux/platform_device.h> 22 23 #include <linux/device.h> 24 #include <linux/dmaengine.h> 25 #include <linux/init.h> 26 #include <linux/errno.h> 27 #include <linux/interrupt.h> 28 #include <linux/irq.h> 29 #include <linux/scatterlist.h> 30 #include <linux/dma-mapping.h> 31 #include <linux/of_device.h> 32 #include <linux/delay.h> 33 #include <linux/crypto.h> 34 #include <crypto/scatterwalk.h> 35 #include <crypto/algapi.h> 36 #include <crypto/internal/des.h> 37 #include <crypto/internal/skcipher.h> 38 #include "atmel-tdes-regs.h" 39 40 #define ATMEL_TDES_PRIORITY 300 41 42 /* TDES flags */ 43 /* Reserve bits [17:16], [13:12], [2:0] for AES Mode Register */ 44 #define TDES_FLAGS_ENCRYPT TDES_MR_CYPHER_ENC 45 #define TDES_FLAGS_OPMODE_MASK (TDES_MR_OPMOD_MASK | TDES_MR_CFBS_MASK) 46 #define TDES_FLAGS_ECB TDES_MR_OPMOD_ECB 47 #define TDES_FLAGS_CBC TDES_MR_OPMOD_CBC 48 #define TDES_FLAGS_OFB TDES_MR_OPMOD_OFB 49 #define TDES_FLAGS_CFB64 (TDES_MR_OPMOD_CFB | TDES_MR_CFBS_64b) 50 #define TDES_FLAGS_CFB32 (TDES_MR_OPMOD_CFB | TDES_MR_CFBS_32b) 51 #define TDES_FLAGS_CFB16 (TDES_MR_OPMOD_CFB | TDES_MR_CFBS_16b) 52 #define TDES_FLAGS_CFB8 (TDES_MR_OPMOD_CFB | TDES_MR_CFBS_8b) 53 54 #define TDES_FLAGS_MODE_MASK (TDES_FLAGS_OPMODE_MASK | TDES_FLAGS_ENCRYPT) 55 56 #define TDES_FLAGS_INIT BIT(3) 57 #define TDES_FLAGS_FAST BIT(4) 58 #define TDES_FLAGS_BUSY BIT(5) 59 #define TDES_FLAGS_DMA BIT(6) 60 61 #define ATMEL_TDES_QUEUE_LENGTH 50 62 63 #define CFB8_BLOCK_SIZE 1 64 #define CFB16_BLOCK_SIZE 2 65 #define CFB32_BLOCK_SIZE 4 66 67 struct atmel_tdes_caps { 68 bool has_dma; 69 u32 has_cfb_3keys; 70 }; 71 72 struct atmel_tdes_dev; 73 74 struct atmel_tdes_ctx { 75 struct atmel_tdes_dev *dd; 76 77 int keylen; 78 u32 key[DES3_EDE_KEY_SIZE / sizeof(u32)]; 79 unsigned long flags; 80 81 u16 block_size; 82 }; 83 84 struct atmel_tdes_reqctx { 85 unsigned long mode; 86 u8 lastc[DES_BLOCK_SIZE]; 87 }; 88 89 struct atmel_tdes_dma { 90 struct dma_chan *chan; 91 struct dma_slave_config dma_conf; 92 }; 93 94 struct atmel_tdes_dev { 95 struct list_head list; 96 unsigned long phys_base; 97 void __iomem *io_base; 98 99 struct atmel_tdes_ctx *ctx; 100 struct device *dev; 101 struct clk *iclk; 102 int irq; 103 104 unsigned long flags; 105 106 spinlock_t lock; 107 struct crypto_queue queue; 108 109 struct tasklet_struct done_task; 110 struct tasklet_struct queue_task; 111 112 struct skcipher_request *req; 113 size_t total; 114 115 struct scatterlist *in_sg; 116 unsigned int nb_in_sg; 117 size_t in_offset; 118 struct scatterlist *out_sg; 119 unsigned int nb_out_sg; 120 size_t out_offset; 121 122 size_t buflen; 123 size_t dma_size; 124 125 void *buf_in; 126 int dma_in; 127 dma_addr_t dma_addr_in; 128 struct atmel_tdes_dma dma_lch_in; 129 130 void *buf_out; 131 int dma_out; 132 dma_addr_t dma_addr_out; 133 struct atmel_tdes_dma dma_lch_out; 134 135 struct atmel_tdes_caps caps; 136 137 u32 hw_version; 138 }; 139 140 struct atmel_tdes_drv { 141 struct list_head dev_list; 142 spinlock_t lock; 143 }; 144 145 static struct atmel_tdes_drv atmel_tdes = { 146 .dev_list = LIST_HEAD_INIT(atmel_tdes.dev_list), 147 .lock = __SPIN_LOCK_UNLOCKED(atmel_tdes.lock), 148 }; 149 150 static int atmel_tdes_sg_copy(struct scatterlist **sg, size_t *offset, 151 void *buf, size_t buflen, size_t total, int out) 152 { 153 size_t count, off = 0; 154 155 while (buflen && total) { 156 count = min((*sg)->length - *offset, total); 157 count = min(count, buflen); 158 159 if (!count) 160 return off; 161 162 scatterwalk_map_and_copy(buf + off, *sg, *offset, count, out); 163 164 off += count; 165 buflen -= count; 166 *offset += count; 167 total -= count; 168 169 if (*offset == (*sg)->length) { 170 *sg = sg_next(*sg); 171 if (*sg) 172 *offset = 0; 173 else 174 total = 0; 175 } 176 } 177 178 return off; 179 } 180 181 static inline u32 atmel_tdes_read(struct atmel_tdes_dev *dd, u32 offset) 182 { 183 return readl_relaxed(dd->io_base + offset); 184 } 185 186 static inline void atmel_tdes_write(struct atmel_tdes_dev *dd, 187 u32 offset, u32 value) 188 { 189 writel_relaxed(value, dd->io_base + offset); 190 } 191 192 static void atmel_tdes_write_n(struct atmel_tdes_dev *dd, u32 offset, 193 const u32 *value, int count) 194 { 195 for (; count--; value++, offset += 4) 196 atmel_tdes_write(dd, offset, *value); 197 } 198 199 static struct atmel_tdes_dev *atmel_tdes_dev_alloc(void) 200 { 201 struct atmel_tdes_dev *tdes_dd; 202 203 spin_lock_bh(&atmel_tdes.lock); 204 /* One TDES IP per SoC. */ 205 tdes_dd = list_first_entry_or_null(&atmel_tdes.dev_list, 206 struct atmel_tdes_dev, list); 207 spin_unlock_bh(&atmel_tdes.lock); 208 return tdes_dd; 209 } 210 211 static int atmel_tdes_hw_init(struct atmel_tdes_dev *dd) 212 { 213 int err; 214 215 err = clk_prepare_enable(dd->iclk); 216 if (err) 217 return err; 218 219 if (!(dd->flags & TDES_FLAGS_INIT)) { 220 atmel_tdes_write(dd, TDES_CR, TDES_CR_SWRST); 221 dd->flags |= TDES_FLAGS_INIT; 222 } 223 224 return 0; 225 } 226 227 static inline unsigned int atmel_tdes_get_version(struct atmel_tdes_dev *dd) 228 { 229 return atmel_tdes_read(dd, TDES_HW_VERSION) & 0x00000fff; 230 } 231 232 static int atmel_tdes_hw_version_init(struct atmel_tdes_dev *dd) 233 { 234 int err; 235 236 err = atmel_tdes_hw_init(dd); 237 if (err) 238 return err; 239 240 dd->hw_version = atmel_tdes_get_version(dd); 241 242 dev_info(dd->dev, 243 "version: 0x%x\n", dd->hw_version); 244 245 clk_disable_unprepare(dd->iclk); 246 247 return 0; 248 } 249 250 static void atmel_tdes_dma_callback(void *data) 251 { 252 struct atmel_tdes_dev *dd = data; 253 254 /* dma_lch_out - completed */ 255 tasklet_schedule(&dd->done_task); 256 } 257 258 static int atmel_tdes_write_ctrl(struct atmel_tdes_dev *dd) 259 { 260 int err; 261 u32 valmr = TDES_MR_SMOD_PDC; 262 263 err = atmel_tdes_hw_init(dd); 264 265 if (err) 266 return err; 267 268 if (!dd->caps.has_dma) 269 atmel_tdes_write(dd, TDES_PTCR, 270 TDES_PTCR_TXTDIS | TDES_PTCR_RXTDIS); 271 272 /* MR register must be set before IV registers */ 273 if (dd->ctx->keylen > (DES_KEY_SIZE << 1)) { 274 valmr |= TDES_MR_KEYMOD_3KEY; 275 valmr |= TDES_MR_TDESMOD_TDES; 276 } else if (dd->ctx->keylen > DES_KEY_SIZE) { 277 valmr |= TDES_MR_KEYMOD_2KEY; 278 valmr |= TDES_MR_TDESMOD_TDES; 279 } else { 280 valmr |= TDES_MR_TDESMOD_DES; 281 } 282 283 valmr |= dd->flags & TDES_FLAGS_MODE_MASK; 284 285 atmel_tdes_write(dd, TDES_MR, valmr); 286 287 atmel_tdes_write_n(dd, TDES_KEY1W1R, dd->ctx->key, 288 dd->ctx->keylen >> 2); 289 290 if (dd->req->iv && (valmr & TDES_MR_OPMOD_MASK) != TDES_MR_OPMOD_ECB) 291 atmel_tdes_write_n(dd, TDES_IV1R, (void *)dd->req->iv, 2); 292 293 return 0; 294 } 295 296 static int atmel_tdes_crypt_pdc_stop(struct atmel_tdes_dev *dd) 297 { 298 int err = 0; 299 size_t count; 300 301 atmel_tdes_write(dd, TDES_PTCR, TDES_PTCR_TXTDIS|TDES_PTCR_RXTDIS); 302 303 if (dd->flags & TDES_FLAGS_FAST) { 304 dma_unmap_sg(dd->dev, dd->out_sg, 1, DMA_FROM_DEVICE); 305 dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE); 306 } else { 307 dma_sync_single_for_device(dd->dev, dd->dma_addr_out, 308 dd->dma_size, DMA_FROM_DEVICE); 309 310 /* copy data */ 311 count = atmel_tdes_sg_copy(&dd->out_sg, &dd->out_offset, 312 dd->buf_out, dd->buflen, dd->dma_size, 1); 313 if (count != dd->dma_size) { 314 err = -EINVAL; 315 dev_dbg(dd->dev, "not all data converted: %zu\n", count); 316 } 317 } 318 319 return err; 320 } 321 322 static int atmel_tdes_buff_init(struct atmel_tdes_dev *dd) 323 { 324 int err = -ENOMEM; 325 326 dd->buf_in = (void *)__get_free_pages(GFP_KERNEL, 0); 327 dd->buf_out = (void *)__get_free_pages(GFP_KERNEL, 0); 328 dd->buflen = PAGE_SIZE; 329 dd->buflen &= ~(DES_BLOCK_SIZE - 1); 330 331 if (!dd->buf_in || !dd->buf_out) { 332 dev_dbg(dd->dev, "unable to alloc pages.\n"); 333 goto err_alloc; 334 } 335 336 /* MAP here */ 337 dd->dma_addr_in = dma_map_single(dd->dev, dd->buf_in, 338 dd->buflen, DMA_TO_DEVICE); 339 err = dma_mapping_error(dd->dev, dd->dma_addr_in); 340 if (err) { 341 dev_dbg(dd->dev, "dma %zd bytes error\n", dd->buflen); 342 goto err_map_in; 343 } 344 345 dd->dma_addr_out = dma_map_single(dd->dev, dd->buf_out, 346 dd->buflen, DMA_FROM_DEVICE); 347 err = dma_mapping_error(dd->dev, dd->dma_addr_out); 348 if (err) { 349 dev_dbg(dd->dev, "dma %zd bytes error\n", dd->buflen); 350 goto err_map_out; 351 } 352 353 return 0; 354 355 err_map_out: 356 dma_unmap_single(dd->dev, dd->dma_addr_in, dd->buflen, 357 DMA_TO_DEVICE); 358 err_map_in: 359 err_alloc: 360 free_page((unsigned long)dd->buf_out); 361 free_page((unsigned long)dd->buf_in); 362 return err; 363 } 364 365 static void atmel_tdes_buff_cleanup(struct atmel_tdes_dev *dd) 366 { 367 dma_unmap_single(dd->dev, dd->dma_addr_out, dd->buflen, 368 DMA_FROM_DEVICE); 369 dma_unmap_single(dd->dev, dd->dma_addr_in, dd->buflen, 370 DMA_TO_DEVICE); 371 free_page((unsigned long)dd->buf_out); 372 free_page((unsigned long)dd->buf_in); 373 } 374 375 static int atmel_tdes_crypt_pdc(struct atmel_tdes_dev *dd, 376 dma_addr_t dma_addr_in, 377 dma_addr_t dma_addr_out, int length) 378 { 379 struct atmel_tdes_reqctx *rctx = skcipher_request_ctx(dd->req); 380 int len32; 381 382 dd->dma_size = length; 383 384 if (!(dd->flags & TDES_FLAGS_FAST)) { 385 dma_sync_single_for_device(dd->dev, dma_addr_in, length, 386 DMA_TO_DEVICE); 387 } 388 389 switch (rctx->mode & TDES_FLAGS_OPMODE_MASK) { 390 case TDES_FLAGS_CFB8: 391 len32 = DIV_ROUND_UP(length, sizeof(u8)); 392 break; 393 394 case TDES_FLAGS_CFB16: 395 len32 = DIV_ROUND_UP(length, sizeof(u16)); 396 break; 397 398 default: 399 len32 = DIV_ROUND_UP(length, sizeof(u32)); 400 break; 401 } 402 403 atmel_tdes_write(dd, TDES_PTCR, TDES_PTCR_TXTDIS|TDES_PTCR_RXTDIS); 404 atmel_tdes_write(dd, TDES_TPR, dma_addr_in); 405 atmel_tdes_write(dd, TDES_TCR, len32); 406 atmel_tdes_write(dd, TDES_RPR, dma_addr_out); 407 atmel_tdes_write(dd, TDES_RCR, len32); 408 409 /* Enable Interrupt */ 410 atmel_tdes_write(dd, TDES_IER, TDES_INT_ENDRX); 411 412 /* Start DMA transfer */ 413 atmel_tdes_write(dd, TDES_PTCR, TDES_PTCR_TXTEN | TDES_PTCR_RXTEN); 414 415 return 0; 416 } 417 418 static int atmel_tdes_crypt_dma(struct atmel_tdes_dev *dd, 419 dma_addr_t dma_addr_in, 420 dma_addr_t dma_addr_out, int length) 421 { 422 struct atmel_tdes_reqctx *rctx = skcipher_request_ctx(dd->req); 423 struct scatterlist sg[2]; 424 struct dma_async_tx_descriptor *in_desc, *out_desc; 425 enum dma_slave_buswidth addr_width; 426 427 dd->dma_size = length; 428 429 if (!(dd->flags & TDES_FLAGS_FAST)) { 430 dma_sync_single_for_device(dd->dev, dma_addr_in, length, 431 DMA_TO_DEVICE); 432 } 433 434 switch (rctx->mode & TDES_FLAGS_OPMODE_MASK) { 435 case TDES_FLAGS_CFB8: 436 addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; 437 break; 438 439 case TDES_FLAGS_CFB16: 440 addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES; 441 break; 442 443 default: 444 addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; 445 break; 446 } 447 448 dd->dma_lch_in.dma_conf.dst_addr_width = addr_width; 449 dd->dma_lch_out.dma_conf.src_addr_width = addr_width; 450 451 dmaengine_slave_config(dd->dma_lch_in.chan, &dd->dma_lch_in.dma_conf); 452 dmaengine_slave_config(dd->dma_lch_out.chan, &dd->dma_lch_out.dma_conf); 453 454 dd->flags |= TDES_FLAGS_DMA; 455 456 sg_init_table(&sg[0], 1); 457 sg_dma_address(&sg[0]) = dma_addr_in; 458 sg_dma_len(&sg[0]) = length; 459 460 sg_init_table(&sg[1], 1); 461 sg_dma_address(&sg[1]) = dma_addr_out; 462 sg_dma_len(&sg[1]) = length; 463 464 in_desc = dmaengine_prep_slave_sg(dd->dma_lch_in.chan, &sg[0], 465 1, DMA_MEM_TO_DEV, 466 DMA_PREP_INTERRUPT | DMA_CTRL_ACK); 467 if (!in_desc) 468 return -EINVAL; 469 470 out_desc = dmaengine_prep_slave_sg(dd->dma_lch_out.chan, &sg[1], 471 1, DMA_DEV_TO_MEM, 472 DMA_PREP_INTERRUPT | DMA_CTRL_ACK); 473 if (!out_desc) 474 return -EINVAL; 475 476 out_desc->callback = atmel_tdes_dma_callback; 477 out_desc->callback_param = dd; 478 479 dmaengine_submit(out_desc); 480 dma_async_issue_pending(dd->dma_lch_out.chan); 481 482 dmaengine_submit(in_desc); 483 dma_async_issue_pending(dd->dma_lch_in.chan); 484 485 return 0; 486 } 487 488 static int atmel_tdes_crypt_start(struct atmel_tdes_dev *dd) 489 { 490 int err, fast = 0, in, out; 491 size_t count; 492 dma_addr_t addr_in, addr_out; 493 494 if ((!dd->in_offset) && (!dd->out_offset)) { 495 /* check for alignment */ 496 in = IS_ALIGNED((u32)dd->in_sg->offset, sizeof(u32)) && 497 IS_ALIGNED(dd->in_sg->length, dd->ctx->block_size); 498 out = IS_ALIGNED((u32)dd->out_sg->offset, sizeof(u32)) && 499 IS_ALIGNED(dd->out_sg->length, dd->ctx->block_size); 500 fast = in && out; 501 502 if (sg_dma_len(dd->in_sg) != sg_dma_len(dd->out_sg)) 503 fast = 0; 504 } 505 506 507 if (fast) { 508 count = min_t(size_t, dd->total, sg_dma_len(dd->in_sg)); 509 count = min_t(size_t, count, sg_dma_len(dd->out_sg)); 510 511 err = dma_map_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE); 512 if (!err) { 513 dev_dbg(dd->dev, "dma_map_sg() error\n"); 514 return -EINVAL; 515 } 516 517 err = dma_map_sg(dd->dev, dd->out_sg, 1, 518 DMA_FROM_DEVICE); 519 if (!err) { 520 dev_dbg(dd->dev, "dma_map_sg() error\n"); 521 dma_unmap_sg(dd->dev, dd->in_sg, 1, 522 DMA_TO_DEVICE); 523 return -EINVAL; 524 } 525 526 addr_in = sg_dma_address(dd->in_sg); 527 addr_out = sg_dma_address(dd->out_sg); 528 529 dd->flags |= TDES_FLAGS_FAST; 530 531 } else { 532 /* use cache buffers */ 533 count = atmel_tdes_sg_copy(&dd->in_sg, &dd->in_offset, 534 dd->buf_in, dd->buflen, dd->total, 0); 535 536 addr_in = dd->dma_addr_in; 537 addr_out = dd->dma_addr_out; 538 539 dd->flags &= ~TDES_FLAGS_FAST; 540 } 541 542 dd->total -= count; 543 544 if (dd->caps.has_dma) 545 err = atmel_tdes_crypt_dma(dd, addr_in, addr_out, count); 546 else 547 err = atmel_tdes_crypt_pdc(dd, addr_in, addr_out, count); 548 549 if (err && (dd->flags & TDES_FLAGS_FAST)) { 550 dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE); 551 dma_unmap_sg(dd->dev, dd->out_sg, 1, DMA_TO_DEVICE); 552 } 553 554 return err; 555 } 556 557 static void 558 atmel_tdes_set_iv_as_last_ciphertext_block(struct atmel_tdes_dev *dd) 559 { 560 struct skcipher_request *req = dd->req; 561 struct atmel_tdes_reqctx *rctx = skcipher_request_ctx(req); 562 struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req); 563 unsigned int ivsize = crypto_skcipher_ivsize(skcipher); 564 565 if (req->cryptlen < ivsize) 566 return; 567 568 if (rctx->mode & TDES_FLAGS_ENCRYPT) { 569 scatterwalk_map_and_copy(req->iv, req->dst, 570 req->cryptlen - ivsize, ivsize, 0); 571 } else { 572 if (req->src == req->dst) 573 memcpy(req->iv, rctx->lastc, ivsize); 574 else 575 scatterwalk_map_and_copy(req->iv, req->src, 576 req->cryptlen - ivsize, 577 ivsize, 0); 578 } 579 } 580 581 static void atmel_tdes_finish_req(struct atmel_tdes_dev *dd, int err) 582 { 583 struct skcipher_request *req = dd->req; 584 struct atmel_tdes_reqctx *rctx = skcipher_request_ctx(req); 585 586 clk_disable_unprepare(dd->iclk); 587 588 dd->flags &= ~TDES_FLAGS_BUSY; 589 590 if (!err && (rctx->mode & TDES_FLAGS_OPMODE_MASK) != TDES_FLAGS_ECB) 591 atmel_tdes_set_iv_as_last_ciphertext_block(dd); 592 593 req->base.complete(&req->base, err); 594 } 595 596 static int atmel_tdes_handle_queue(struct atmel_tdes_dev *dd, 597 struct skcipher_request *req) 598 { 599 struct crypto_async_request *async_req, *backlog; 600 struct atmel_tdes_ctx *ctx; 601 struct atmel_tdes_reqctx *rctx; 602 unsigned long flags; 603 int err, ret = 0; 604 605 spin_lock_irqsave(&dd->lock, flags); 606 if (req) 607 ret = crypto_enqueue_request(&dd->queue, &req->base); 608 if (dd->flags & TDES_FLAGS_BUSY) { 609 spin_unlock_irqrestore(&dd->lock, flags); 610 return ret; 611 } 612 backlog = crypto_get_backlog(&dd->queue); 613 async_req = crypto_dequeue_request(&dd->queue); 614 if (async_req) 615 dd->flags |= TDES_FLAGS_BUSY; 616 spin_unlock_irqrestore(&dd->lock, flags); 617 618 if (!async_req) 619 return ret; 620 621 if (backlog) 622 backlog->complete(backlog, -EINPROGRESS); 623 624 req = skcipher_request_cast(async_req); 625 626 /* assign new request to device */ 627 dd->req = req; 628 dd->total = req->cryptlen; 629 dd->in_offset = 0; 630 dd->in_sg = req->src; 631 dd->out_offset = 0; 632 dd->out_sg = req->dst; 633 634 rctx = skcipher_request_ctx(req); 635 ctx = crypto_skcipher_ctx(crypto_skcipher_reqtfm(req)); 636 rctx->mode &= TDES_FLAGS_MODE_MASK; 637 dd->flags = (dd->flags & ~TDES_FLAGS_MODE_MASK) | rctx->mode; 638 dd->ctx = ctx; 639 640 err = atmel_tdes_write_ctrl(dd); 641 if (!err) 642 err = atmel_tdes_crypt_start(dd); 643 if (err) { 644 /* des_task will not finish it, so do it here */ 645 atmel_tdes_finish_req(dd, err); 646 tasklet_schedule(&dd->queue_task); 647 } 648 649 return ret; 650 } 651 652 static int atmel_tdes_crypt_dma_stop(struct atmel_tdes_dev *dd) 653 { 654 int err = -EINVAL; 655 size_t count; 656 657 if (dd->flags & TDES_FLAGS_DMA) { 658 err = 0; 659 if (dd->flags & TDES_FLAGS_FAST) { 660 dma_unmap_sg(dd->dev, dd->out_sg, 1, DMA_FROM_DEVICE); 661 dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE); 662 } else { 663 dma_sync_single_for_device(dd->dev, dd->dma_addr_out, 664 dd->dma_size, DMA_FROM_DEVICE); 665 666 /* copy data */ 667 count = atmel_tdes_sg_copy(&dd->out_sg, &dd->out_offset, 668 dd->buf_out, dd->buflen, dd->dma_size, 1); 669 if (count != dd->dma_size) { 670 err = -EINVAL; 671 dev_dbg(dd->dev, "not all data converted: %zu\n", count); 672 } 673 } 674 } 675 return err; 676 } 677 678 static int atmel_tdes_crypt(struct skcipher_request *req, unsigned long mode) 679 { 680 struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req); 681 struct atmel_tdes_ctx *ctx = crypto_skcipher_ctx(skcipher); 682 struct atmel_tdes_reqctx *rctx = skcipher_request_ctx(req); 683 struct device *dev = ctx->dd->dev; 684 685 if (!req->cryptlen) 686 return 0; 687 688 switch (mode & TDES_FLAGS_OPMODE_MASK) { 689 case TDES_FLAGS_CFB8: 690 if (!IS_ALIGNED(req->cryptlen, CFB8_BLOCK_SIZE)) { 691 dev_dbg(dev, "request size is not exact amount of CFB8 blocks\n"); 692 return -EINVAL; 693 } 694 ctx->block_size = CFB8_BLOCK_SIZE; 695 break; 696 697 case TDES_FLAGS_CFB16: 698 if (!IS_ALIGNED(req->cryptlen, CFB16_BLOCK_SIZE)) { 699 dev_dbg(dev, "request size is not exact amount of CFB16 blocks\n"); 700 return -EINVAL; 701 } 702 ctx->block_size = CFB16_BLOCK_SIZE; 703 break; 704 705 case TDES_FLAGS_CFB32: 706 if (!IS_ALIGNED(req->cryptlen, CFB32_BLOCK_SIZE)) { 707 dev_dbg(dev, "request size is not exact amount of CFB32 blocks\n"); 708 return -EINVAL; 709 } 710 ctx->block_size = CFB32_BLOCK_SIZE; 711 break; 712 713 default: 714 if (!IS_ALIGNED(req->cryptlen, DES_BLOCK_SIZE)) { 715 dev_dbg(dev, "request size is not exact amount of DES blocks\n"); 716 return -EINVAL; 717 } 718 ctx->block_size = DES_BLOCK_SIZE; 719 break; 720 } 721 722 rctx->mode = mode; 723 724 if ((mode & TDES_FLAGS_OPMODE_MASK) != TDES_FLAGS_ECB && 725 !(mode & TDES_FLAGS_ENCRYPT) && req->src == req->dst) { 726 unsigned int ivsize = crypto_skcipher_ivsize(skcipher); 727 728 if (req->cryptlen >= ivsize) 729 scatterwalk_map_and_copy(rctx->lastc, req->src, 730 req->cryptlen - ivsize, 731 ivsize, 0); 732 } 733 734 return atmel_tdes_handle_queue(ctx->dd, req); 735 } 736 737 static int atmel_tdes_dma_init(struct atmel_tdes_dev *dd) 738 { 739 int ret; 740 741 /* Try to grab 2 DMA channels */ 742 dd->dma_lch_in.chan = dma_request_chan(dd->dev, "tx"); 743 if (IS_ERR(dd->dma_lch_in.chan)) { 744 ret = PTR_ERR(dd->dma_lch_in.chan); 745 goto err_dma_in; 746 } 747 748 dd->dma_lch_in.dma_conf.dst_addr = dd->phys_base + 749 TDES_IDATA1R; 750 dd->dma_lch_in.dma_conf.src_maxburst = 1; 751 dd->dma_lch_in.dma_conf.src_addr_width = 752 DMA_SLAVE_BUSWIDTH_4_BYTES; 753 dd->dma_lch_in.dma_conf.dst_maxburst = 1; 754 dd->dma_lch_in.dma_conf.dst_addr_width = 755 DMA_SLAVE_BUSWIDTH_4_BYTES; 756 dd->dma_lch_in.dma_conf.device_fc = false; 757 758 dd->dma_lch_out.chan = dma_request_chan(dd->dev, "rx"); 759 if (IS_ERR(dd->dma_lch_out.chan)) { 760 ret = PTR_ERR(dd->dma_lch_out.chan); 761 goto err_dma_out; 762 } 763 764 dd->dma_lch_out.dma_conf.src_addr = dd->phys_base + 765 TDES_ODATA1R; 766 dd->dma_lch_out.dma_conf.src_maxburst = 1; 767 dd->dma_lch_out.dma_conf.src_addr_width = 768 DMA_SLAVE_BUSWIDTH_4_BYTES; 769 dd->dma_lch_out.dma_conf.dst_maxburst = 1; 770 dd->dma_lch_out.dma_conf.dst_addr_width = 771 DMA_SLAVE_BUSWIDTH_4_BYTES; 772 dd->dma_lch_out.dma_conf.device_fc = false; 773 774 return 0; 775 776 err_dma_out: 777 dma_release_channel(dd->dma_lch_in.chan); 778 err_dma_in: 779 dev_err(dd->dev, "no DMA channel available\n"); 780 return ret; 781 } 782 783 static void atmel_tdes_dma_cleanup(struct atmel_tdes_dev *dd) 784 { 785 dma_release_channel(dd->dma_lch_in.chan); 786 dma_release_channel(dd->dma_lch_out.chan); 787 } 788 789 static int atmel_des_setkey(struct crypto_skcipher *tfm, const u8 *key, 790 unsigned int keylen) 791 { 792 struct atmel_tdes_ctx *ctx = crypto_skcipher_ctx(tfm); 793 int err; 794 795 err = verify_skcipher_des_key(tfm, key); 796 if (err) 797 return err; 798 799 memcpy(ctx->key, key, keylen); 800 ctx->keylen = keylen; 801 802 return 0; 803 } 804 805 static int atmel_tdes_setkey(struct crypto_skcipher *tfm, const u8 *key, 806 unsigned int keylen) 807 { 808 struct atmel_tdes_ctx *ctx = crypto_skcipher_ctx(tfm); 809 int err; 810 811 err = verify_skcipher_des3_key(tfm, key); 812 if (err) 813 return err; 814 815 memcpy(ctx->key, key, keylen); 816 ctx->keylen = keylen; 817 818 return 0; 819 } 820 821 static int atmel_tdes_ecb_encrypt(struct skcipher_request *req) 822 { 823 return atmel_tdes_crypt(req, TDES_FLAGS_ECB | TDES_FLAGS_ENCRYPT); 824 } 825 826 static int atmel_tdes_ecb_decrypt(struct skcipher_request *req) 827 { 828 return atmel_tdes_crypt(req, TDES_FLAGS_ECB); 829 } 830 831 static int atmel_tdes_cbc_encrypt(struct skcipher_request *req) 832 { 833 return atmel_tdes_crypt(req, TDES_FLAGS_CBC | TDES_FLAGS_ENCRYPT); 834 } 835 836 static int atmel_tdes_cbc_decrypt(struct skcipher_request *req) 837 { 838 return atmel_tdes_crypt(req, TDES_FLAGS_CBC); 839 } 840 static int atmel_tdes_cfb_encrypt(struct skcipher_request *req) 841 { 842 return atmel_tdes_crypt(req, TDES_FLAGS_CFB64 | TDES_FLAGS_ENCRYPT); 843 } 844 845 static int atmel_tdes_cfb_decrypt(struct skcipher_request *req) 846 { 847 return atmel_tdes_crypt(req, TDES_FLAGS_CFB64); 848 } 849 850 static int atmel_tdes_cfb8_encrypt(struct skcipher_request *req) 851 { 852 return atmel_tdes_crypt(req, TDES_FLAGS_CFB8 | TDES_FLAGS_ENCRYPT); 853 } 854 855 static int atmel_tdes_cfb8_decrypt(struct skcipher_request *req) 856 { 857 return atmel_tdes_crypt(req, TDES_FLAGS_CFB8); 858 } 859 860 static int atmel_tdes_cfb16_encrypt(struct skcipher_request *req) 861 { 862 return atmel_tdes_crypt(req, TDES_FLAGS_CFB16 | TDES_FLAGS_ENCRYPT); 863 } 864 865 static int atmel_tdes_cfb16_decrypt(struct skcipher_request *req) 866 { 867 return atmel_tdes_crypt(req, TDES_FLAGS_CFB16); 868 } 869 870 static int atmel_tdes_cfb32_encrypt(struct skcipher_request *req) 871 { 872 return atmel_tdes_crypt(req, TDES_FLAGS_CFB32 | TDES_FLAGS_ENCRYPT); 873 } 874 875 static int atmel_tdes_cfb32_decrypt(struct skcipher_request *req) 876 { 877 return atmel_tdes_crypt(req, TDES_FLAGS_CFB32); 878 } 879 880 static int atmel_tdes_ofb_encrypt(struct skcipher_request *req) 881 { 882 return atmel_tdes_crypt(req, TDES_FLAGS_OFB | TDES_FLAGS_ENCRYPT); 883 } 884 885 static int atmel_tdes_ofb_decrypt(struct skcipher_request *req) 886 { 887 return atmel_tdes_crypt(req, TDES_FLAGS_OFB); 888 } 889 890 static int atmel_tdes_init_tfm(struct crypto_skcipher *tfm) 891 { 892 struct atmel_tdes_ctx *ctx = crypto_skcipher_ctx(tfm); 893 894 ctx->dd = atmel_tdes_dev_alloc(); 895 if (!ctx->dd) 896 return -ENODEV; 897 898 crypto_skcipher_set_reqsize(tfm, sizeof(struct atmel_tdes_reqctx)); 899 900 return 0; 901 } 902 903 static void atmel_tdes_skcipher_alg_init(struct skcipher_alg *alg) 904 { 905 alg->base.cra_priority = ATMEL_TDES_PRIORITY; 906 alg->base.cra_flags = CRYPTO_ALG_ASYNC; 907 alg->base.cra_ctxsize = sizeof(struct atmel_tdes_ctx); 908 alg->base.cra_module = THIS_MODULE; 909 910 alg->init = atmel_tdes_init_tfm; 911 } 912 913 static struct skcipher_alg tdes_algs[] = { 914 { 915 .base.cra_name = "ecb(des)", 916 .base.cra_driver_name = "atmel-ecb-des", 917 .base.cra_blocksize = DES_BLOCK_SIZE, 918 .base.cra_alignmask = 0x7, 919 920 .min_keysize = DES_KEY_SIZE, 921 .max_keysize = DES_KEY_SIZE, 922 .setkey = atmel_des_setkey, 923 .encrypt = atmel_tdes_ecb_encrypt, 924 .decrypt = atmel_tdes_ecb_decrypt, 925 }, 926 { 927 .base.cra_name = "cbc(des)", 928 .base.cra_driver_name = "atmel-cbc-des", 929 .base.cra_blocksize = DES_BLOCK_SIZE, 930 .base.cra_alignmask = 0x7, 931 932 .min_keysize = DES_KEY_SIZE, 933 .max_keysize = DES_KEY_SIZE, 934 .ivsize = DES_BLOCK_SIZE, 935 .setkey = atmel_des_setkey, 936 .encrypt = atmel_tdes_cbc_encrypt, 937 .decrypt = atmel_tdes_cbc_decrypt, 938 }, 939 { 940 .base.cra_name = "cfb(des)", 941 .base.cra_driver_name = "atmel-cfb-des", 942 .base.cra_blocksize = DES_BLOCK_SIZE, 943 .base.cra_alignmask = 0x7, 944 945 .min_keysize = DES_KEY_SIZE, 946 .max_keysize = DES_KEY_SIZE, 947 .ivsize = DES_BLOCK_SIZE, 948 .setkey = atmel_des_setkey, 949 .encrypt = atmel_tdes_cfb_encrypt, 950 .decrypt = atmel_tdes_cfb_decrypt, 951 }, 952 { 953 .base.cra_name = "cfb8(des)", 954 .base.cra_driver_name = "atmel-cfb8-des", 955 .base.cra_blocksize = CFB8_BLOCK_SIZE, 956 .base.cra_alignmask = 0, 957 958 .min_keysize = DES_KEY_SIZE, 959 .max_keysize = DES_KEY_SIZE, 960 .ivsize = DES_BLOCK_SIZE, 961 .setkey = atmel_des_setkey, 962 .encrypt = atmel_tdes_cfb8_encrypt, 963 .decrypt = atmel_tdes_cfb8_decrypt, 964 }, 965 { 966 .base.cra_name = "cfb16(des)", 967 .base.cra_driver_name = "atmel-cfb16-des", 968 .base.cra_blocksize = CFB16_BLOCK_SIZE, 969 .base.cra_alignmask = 0x1, 970 971 .min_keysize = DES_KEY_SIZE, 972 .max_keysize = DES_KEY_SIZE, 973 .ivsize = DES_BLOCK_SIZE, 974 .setkey = atmel_des_setkey, 975 .encrypt = atmel_tdes_cfb16_encrypt, 976 .decrypt = atmel_tdes_cfb16_decrypt, 977 }, 978 { 979 .base.cra_name = "cfb32(des)", 980 .base.cra_driver_name = "atmel-cfb32-des", 981 .base.cra_blocksize = CFB32_BLOCK_SIZE, 982 .base.cra_alignmask = 0x3, 983 984 .min_keysize = DES_KEY_SIZE, 985 .max_keysize = DES_KEY_SIZE, 986 .ivsize = DES_BLOCK_SIZE, 987 .setkey = atmel_des_setkey, 988 .encrypt = atmel_tdes_cfb32_encrypt, 989 .decrypt = atmel_tdes_cfb32_decrypt, 990 }, 991 { 992 .base.cra_name = "ofb(des)", 993 .base.cra_driver_name = "atmel-ofb-des", 994 .base.cra_blocksize = 1, 995 .base.cra_alignmask = 0x7, 996 997 .min_keysize = DES_KEY_SIZE, 998 .max_keysize = DES_KEY_SIZE, 999 .ivsize = DES_BLOCK_SIZE, 1000 .setkey = atmel_des_setkey, 1001 .encrypt = atmel_tdes_ofb_encrypt, 1002 .decrypt = atmel_tdes_ofb_decrypt, 1003 }, 1004 { 1005 .base.cra_name = "ecb(des3_ede)", 1006 .base.cra_driver_name = "atmel-ecb-tdes", 1007 .base.cra_blocksize = DES_BLOCK_SIZE, 1008 .base.cra_alignmask = 0x7, 1009 1010 .min_keysize = DES3_EDE_KEY_SIZE, 1011 .max_keysize = DES3_EDE_KEY_SIZE, 1012 .setkey = atmel_tdes_setkey, 1013 .encrypt = atmel_tdes_ecb_encrypt, 1014 .decrypt = atmel_tdes_ecb_decrypt, 1015 }, 1016 { 1017 .base.cra_name = "cbc(des3_ede)", 1018 .base.cra_driver_name = "atmel-cbc-tdes", 1019 .base.cra_blocksize = DES_BLOCK_SIZE, 1020 .base.cra_alignmask = 0x7, 1021 1022 .min_keysize = DES3_EDE_KEY_SIZE, 1023 .max_keysize = DES3_EDE_KEY_SIZE, 1024 .setkey = atmel_tdes_setkey, 1025 .encrypt = atmel_tdes_cbc_encrypt, 1026 .decrypt = atmel_tdes_cbc_decrypt, 1027 .ivsize = DES_BLOCK_SIZE, 1028 }, 1029 { 1030 .base.cra_name = "ofb(des3_ede)", 1031 .base.cra_driver_name = "atmel-ofb-tdes", 1032 .base.cra_blocksize = DES_BLOCK_SIZE, 1033 .base.cra_alignmask = 0x7, 1034 1035 .min_keysize = DES3_EDE_KEY_SIZE, 1036 .max_keysize = DES3_EDE_KEY_SIZE, 1037 .setkey = atmel_tdes_setkey, 1038 .encrypt = atmel_tdes_ofb_encrypt, 1039 .decrypt = atmel_tdes_ofb_decrypt, 1040 .ivsize = DES_BLOCK_SIZE, 1041 }, 1042 }; 1043 1044 static void atmel_tdes_queue_task(unsigned long data) 1045 { 1046 struct atmel_tdes_dev *dd = (struct atmel_tdes_dev *)data; 1047 1048 atmel_tdes_handle_queue(dd, NULL); 1049 } 1050 1051 static void atmel_tdes_done_task(unsigned long data) 1052 { 1053 struct atmel_tdes_dev *dd = (struct atmel_tdes_dev *) data; 1054 int err; 1055 1056 if (!(dd->flags & TDES_FLAGS_DMA)) 1057 err = atmel_tdes_crypt_pdc_stop(dd); 1058 else 1059 err = atmel_tdes_crypt_dma_stop(dd); 1060 1061 if (dd->total && !err) { 1062 if (dd->flags & TDES_FLAGS_FAST) { 1063 dd->in_sg = sg_next(dd->in_sg); 1064 dd->out_sg = sg_next(dd->out_sg); 1065 if (!dd->in_sg || !dd->out_sg) 1066 err = -EINVAL; 1067 } 1068 if (!err) 1069 err = atmel_tdes_crypt_start(dd); 1070 if (!err) 1071 return; /* DMA started. Not fininishing. */ 1072 } 1073 1074 atmel_tdes_finish_req(dd, err); 1075 atmel_tdes_handle_queue(dd, NULL); 1076 } 1077 1078 static irqreturn_t atmel_tdes_irq(int irq, void *dev_id) 1079 { 1080 struct atmel_tdes_dev *tdes_dd = dev_id; 1081 u32 reg; 1082 1083 reg = atmel_tdes_read(tdes_dd, TDES_ISR); 1084 if (reg & atmel_tdes_read(tdes_dd, TDES_IMR)) { 1085 atmel_tdes_write(tdes_dd, TDES_IDR, reg); 1086 if (TDES_FLAGS_BUSY & tdes_dd->flags) 1087 tasklet_schedule(&tdes_dd->done_task); 1088 else 1089 dev_warn(tdes_dd->dev, "TDES interrupt when no active requests.\n"); 1090 return IRQ_HANDLED; 1091 } 1092 1093 return IRQ_NONE; 1094 } 1095 1096 static void atmel_tdes_unregister_algs(struct atmel_tdes_dev *dd) 1097 { 1098 int i; 1099 1100 for (i = 0; i < ARRAY_SIZE(tdes_algs); i++) 1101 crypto_unregister_skcipher(&tdes_algs[i]); 1102 } 1103 1104 static int atmel_tdes_register_algs(struct atmel_tdes_dev *dd) 1105 { 1106 int err, i, j; 1107 1108 for (i = 0; i < ARRAY_SIZE(tdes_algs); i++) { 1109 atmel_tdes_skcipher_alg_init(&tdes_algs[i]); 1110 1111 err = crypto_register_skcipher(&tdes_algs[i]); 1112 if (err) 1113 goto err_tdes_algs; 1114 } 1115 1116 return 0; 1117 1118 err_tdes_algs: 1119 for (j = 0; j < i; j++) 1120 crypto_unregister_skcipher(&tdes_algs[j]); 1121 1122 return err; 1123 } 1124 1125 static void atmel_tdes_get_cap(struct atmel_tdes_dev *dd) 1126 { 1127 1128 dd->caps.has_dma = 0; 1129 dd->caps.has_cfb_3keys = 0; 1130 1131 /* keep only major version number */ 1132 switch (dd->hw_version & 0xf00) { 1133 case 0x800: 1134 case 0x700: 1135 dd->caps.has_dma = 1; 1136 dd->caps.has_cfb_3keys = 1; 1137 break; 1138 case 0x600: 1139 break; 1140 default: 1141 dev_warn(dd->dev, 1142 "Unmanaged tdes version, set minimum capabilities\n"); 1143 break; 1144 } 1145 } 1146 1147 #if defined(CONFIG_OF) 1148 static const struct of_device_id atmel_tdes_dt_ids[] = { 1149 { .compatible = "atmel,at91sam9g46-tdes" }, 1150 { /* sentinel */ } 1151 }; 1152 MODULE_DEVICE_TABLE(of, atmel_tdes_dt_ids); 1153 #endif 1154 1155 static int atmel_tdes_probe(struct platform_device *pdev) 1156 { 1157 struct atmel_tdes_dev *tdes_dd; 1158 struct device *dev = &pdev->dev; 1159 struct resource *tdes_res; 1160 int err; 1161 1162 tdes_dd = devm_kmalloc(&pdev->dev, sizeof(*tdes_dd), GFP_KERNEL); 1163 if (!tdes_dd) 1164 return -ENOMEM; 1165 1166 tdes_dd->dev = dev; 1167 1168 platform_set_drvdata(pdev, tdes_dd); 1169 1170 INIT_LIST_HEAD(&tdes_dd->list); 1171 spin_lock_init(&tdes_dd->lock); 1172 1173 tasklet_init(&tdes_dd->done_task, atmel_tdes_done_task, 1174 (unsigned long)tdes_dd); 1175 tasklet_init(&tdes_dd->queue_task, atmel_tdes_queue_task, 1176 (unsigned long)tdes_dd); 1177 1178 crypto_init_queue(&tdes_dd->queue, ATMEL_TDES_QUEUE_LENGTH); 1179 1180 /* Get the base address */ 1181 tdes_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1182 if (!tdes_res) { 1183 dev_err(dev, "no MEM resource info\n"); 1184 err = -ENODEV; 1185 goto err_tasklet_kill; 1186 } 1187 tdes_dd->phys_base = tdes_res->start; 1188 1189 /* Get the IRQ */ 1190 tdes_dd->irq = platform_get_irq(pdev, 0); 1191 if (tdes_dd->irq < 0) { 1192 err = tdes_dd->irq; 1193 goto err_tasklet_kill; 1194 } 1195 1196 err = devm_request_irq(&pdev->dev, tdes_dd->irq, atmel_tdes_irq, 1197 IRQF_SHARED, "atmel-tdes", tdes_dd); 1198 if (err) { 1199 dev_err(dev, "unable to request tdes irq.\n"); 1200 goto err_tasklet_kill; 1201 } 1202 1203 /* Initializing the clock */ 1204 tdes_dd->iclk = devm_clk_get(&pdev->dev, "tdes_clk"); 1205 if (IS_ERR(tdes_dd->iclk)) { 1206 dev_err(dev, "clock initialization failed.\n"); 1207 err = PTR_ERR(tdes_dd->iclk); 1208 goto err_tasklet_kill; 1209 } 1210 1211 tdes_dd->io_base = devm_ioremap_resource(&pdev->dev, tdes_res); 1212 if (IS_ERR(tdes_dd->io_base)) { 1213 err = PTR_ERR(tdes_dd->io_base); 1214 goto err_tasklet_kill; 1215 } 1216 1217 err = atmel_tdes_hw_version_init(tdes_dd); 1218 if (err) 1219 goto err_tasklet_kill; 1220 1221 atmel_tdes_get_cap(tdes_dd); 1222 1223 err = atmel_tdes_buff_init(tdes_dd); 1224 if (err) 1225 goto err_tasklet_kill; 1226 1227 if (tdes_dd->caps.has_dma) { 1228 err = atmel_tdes_dma_init(tdes_dd); 1229 if (err) 1230 goto err_buff_cleanup; 1231 1232 dev_info(dev, "using %s, %s for DMA transfers\n", 1233 dma_chan_name(tdes_dd->dma_lch_in.chan), 1234 dma_chan_name(tdes_dd->dma_lch_out.chan)); 1235 } 1236 1237 spin_lock(&atmel_tdes.lock); 1238 list_add_tail(&tdes_dd->list, &atmel_tdes.dev_list); 1239 spin_unlock(&atmel_tdes.lock); 1240 1241 err = atmel_tdes_register_algs(tdes_dd); 1242 if (err) 1243 goto err_algs; 1244 1245 dev_info(dev, "Atmel DES/TDES\n"); 1246 1247 return 0; 1248 1249 err_algs: 1250 spin_lock(&atmel_tdes.lock); 1251 list_del(&tdes_dd->list); 1252 spin_unlock(&atmel_tdes.lock); 1253 if (tdes_dd->caps.has_dma) 1254 atmel_tdes_dma_cleanup(tdes_dd); 1255 err_buff_cleanup: 1256 atmel_tdes_buff_cleanup(tdes_dd); 1257 err_tasklet_kill: 1258 tasklet_kill(&tdes_dd->done_task); 1259 tasklet_kill(&tdes_dd->queue_task); 1260 1261 return err; 1262 } 1263 1264 static int atmel_tdes_remove(struct platform_device *pdev) 1265 { 1266 struct atmel_tdes_dev *tdes_dd; 1267 1268 tdes_dd = platform_get_drvdata(pdev); 1269 if (!tdes_dd) 1270 return -ENODEV; 1271 spin_lock(&atmel_tdes.lock); 1272 list_del(&tdes_dd->list); 1273 spin_unlock(&atmel_tdes.lock); 1274 1275 atmel_tdes_unregister_algs(tdes_dd); 1276 1277 tasklet_kill(&tdes_dd->done_task); 1278 tasklet_kill(&tdes_dd->queue_task); 1279 1280 if (tdes_dd->caps.has_dma) 1281 atmel_tdes_dma_cleanup(tdes_dd); 1282 1283 atmel_tdes_buff_cleanup(tdes_dd); 1284 1285 return 0; 1286 } 1287 1288 static struct platform_driver atmel_tdes_driver = { 1289 .probe = atmel_tdes_probe, 1290 .remove = atmel_tdes_remove, 1291 .driver = { 1292 .name = "atmel_tdes", 1293 .of_match_table = of_match_ptr(atmel_tdes_dt_ids), 1294 }, 1295 }; 1296 1297 module_platform_driver(atmel_tdes_driver); 1298 1299 MODULE_DESCRIPTION("Atmel DES/TDES hw acceleration support."); 1300 MODULE_LICENSE("GPL v2"); 1301 MODULE_AUTHOR("Nicolas Royer - Eukréa Electromatique"); 1302