1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Cryptographic API. 4 * 5 * Support for SAHARA cryptographic accelerator. 6 * 7 * Copyright (c) 2014 Steffen Trumtrar <s.trumtrar@pengutronix.de> 8 * Copyright (c) 2013 Vista Silicon S.L. 9 * Author: Javier Martin <javier.martin@vista-silicon.com> 10 * 11 * Based on omap-aes.c and tegra-aes.c 12 */ 13 14 #include <crypto/aes.h> 15 #include <crypto/internal/hash.h> 16 #include <crypto/internal/skcipher.h> 17 #include <crypto/scatterwalk.h> 18 #include <crypto/sha.h> 19 20 #include <linux/clk.h> 21 #include <linux/crypto.h> 22 #include <linux/interrupt.h> 23 #include <linux/io.h> 24 #include <linux/irq.h> 25 #include <linux/kernel.h> 26 #include <linux/kthread.h> 27 #include <linux/module.h> 28 #include <linux/mutex.h> 29 #include <linux/of.h> 30 #include <linux/of_device.h> 31 #include <linux/platform_device.h> 32 33 #define SHA_BUFFER_LEN PAGE_SIZE 34 #define SAHARA_MAX_SHA_BLOCK_SIZE SHA256_BLOCK_SIZE 35 36 #define SAHARA_NAME "sahara" 37 #define SAHARA_VERSION_3 3 38 #define SAHARA_VERSION_4 4 39 #define SAHARA_TIMEOUT_MS 1000 40 #define SAHARA_MAX_HW_DESC 2 41 #define SAHARA_MAX_HW_LINK 20 42 43 #define FLAGS_MODE_MASK 0x000f 44 #define FLAGS_ENCRYPT BIT(0) 45 #define FLAGS_CBC BIT(1) 46 #define FLAGS_NEW_KEY BIT(3) 47 48 #define SAHARA_HDR_BASE 0x00800000 49 #define SAHARA_HDR_SKHA_ALG_AES 0 50 #define SAHARA_HDR_SKHA_OP_ENC (1 << 2) 51 #define SAHARA_HDR_SKHA_MODE_ECB (0 << 3) 52 #define SAHARA_HDR_SKHA_MODE_CBC (1 << 3) 53 #define SAHARA_HDR_FORM_DATA (5 << 16) 54 #define SAHARA_HDR_FORM_KEY (8 << 16) 55 #define SAHARA_HDR_LLO (1 << 24) 56 #define SAHARA_HDR_CHA_SKHA (1 << 28) 57 #define SAHARA_HDR_CHA_MDHA (2 << 28) 58 #define SAHARA_HDR_PARITY_BIT (1 << 31) 59 60 #define SAHARA_HDR_MDHA_SET_MODE_MD_KEY 0x20880000 61 #define SAHARA_HDR_MDHA_SET_MODE_HASH 0x208D0000 62 #define SAHARA_HDR_MDHA_HASH 0xA0850000 63 #define SAHARA_HDR_MDHA_STORE_DIGEST 0x20820000 64 #define SAHARA_HDR_MDHA_ALG_SHA1 0 65 #define SAHARA_HDR_MDHA_ALG_MD5 1 66 #define SAHARA_HDR_MDHA_ALG_SHA256 2 67 #define SAHARA_HDR_MDHA_ALG_SHA224 3 68 #define SAHARA_HDR_MDHA_PDATA (1 << 2) 69 #define SAHARA_HDR_MDHA_HMAC (1 << 3) 70 #define SAHARA_HDR_MDHA_INIT (1 << 5) 71 #define SAHARA_HDR_MDHA_IPAD (1 << 6) 72 #define SAHARA_HDR_MDHA_OPAD (1 << 7) 73 #define SAHARA_HDR_MDHA_SWAP (1 << 8) 74 #define SAHARA_HDR_MDHA_MAC_FULL (1 << 9) 75 #define SAHARA_HDR_MDHA_SSL (1 << 10) 76 77 /* SAHARA can only process one request at a time */ 78 #define SAHARA_QUEUE_LENGTH 1 79 80 #define SAHARA_REG_VERSION 0x00 81 #define SAHARA_REG_DAR 0x04 82 #define SAHARA_REG_CONTROL 0x08 83 #define SAHARA_CONTROL_SET_THROTTLE(x) (((x) & 0xff) << 24) 84 #define SAHARA_CONTROL_SET_MAXBURST(x) (((x) & 0xff) << 16) 85 #define SAHARA_CONTROL_RNG_AUTORSD (1 << 7) 86 #define SAHARA_CONTROL_ENABLE_INT (1 << 4) 87 #define SAHARA_REG_CMD 0x0C 88 #define SAHARA_CMD_RESET (1 << 0) 89 #define SAHARA_CMD_CLEAR_INT (1 << 8) 90 #define SAHARA_CMD_CLEAR_ERR (1 << 9) 91 #define SAHARA_CMD_SINGLE_STEP (1 << 10) 92 #define SAHARA_CMD_MODE_BATCH (1 << 16) 93 #define SAHARA_CMD_MODE_DEBUG (1 << 18) 94 #define SAHARA_REG_STATUS 0x10 95 #define SAHARA_STATUS_GET_STATE(x) ((x) & 0x7) 96 #define SAHARA_STATE_IDLE 0 97 #define SAHARA_STATE_BUSY 1 98 #define SAHARA_STATE_ERR 2 99 #define SAHARA_STATE_FAULT 3 100 #define SAHARA_STATE_COMPLETE 4 101 #define SAHARA_STATE_COMP_FLAG (1 << 2) 102 #define SAHARA_STATUS_DAR_FULL (1 << 3) 103 #define SAHARA_STATUS_ERROR (1 << 4) 104 #define SAHARA_STATUS_SECURE (1 << 5) 105 #define SAHARA_STATUS_FAIL (1 << 6) 106 #define SAHARA_STATUS_INIT (1 << 7) 107 #define SAHARA_STATUS_RNG_RESEED (1 << 8) 108 #define SAHARA_STATUS_ACTIVE_RNG (1 << 9) 109 #define SAHARA_STATUS_ACTIVE_MDHA (1 << 10) 110 #define SAHARA_STATUS_ACTIVE_SKHA (1 << 11) 111 #define SAHARA_STATUS_MODE_BATCH (1 << 16) 112 #define SAHARA_STATUS_MODE_DEDICATED (1 << 17) 113 #define SAHARA_STATUS_MODE_DEBUG (1 << 18) 114 #define SAHARA_STATUS_GET_ISTATE(x) (((x) >> 24) & 0xff) 115 #define SAHARA_REG_ERRSTATUS 0x14 116 #define SAHARA_ERRSTATUS_GET_SOURCE(x) ((x) & 0xf) 117 #define SAHARA_ERRSOURCE_CHA 14 118 #define SAHARA_ERRSOURCE_DMA 15 119 #define SAHARA_ERRSTATUS_DMA_DIR (1 << 8) 120 #define SAHARA_ERRSTATUS_GET_DMASZ(x)(((x) >> 9) & 0x3) 121 #define SAHARA_ERRSTATUS_GET_DMASRC(x) (((x) >> 13) & 0x7) 122 #define SAHARA_ERRSTATUS_GET_CHASRC(x) (((x) >> 16) & 0xfff) 123 #define SAHARA_ERRSTATUS_GET_CHAERR(x) (((x) >> 28) & 0x3) 124 #define SAHARA_REG_FADDR 0x18 125 #define SAHARA_REG_CDAR 0x1C 126 #define SAHARA_REG_IDAR 0x20 127 128 struct sahara_hw_desc { 129 u32 hdr; 130 u32 len1; 131 u32 p1; 132 u32 len2; 133 u32 p2; 134 u32 next; 135 }; 136 137 struct sahara_hw_link { 138 u32 len; 139 u32 p; 140 u32 next; 141 }; 142 143 struct sahara_ctx { 144 unsigned long flags; 145 146 /* AES-specific context */ 147 int keylen; 148 u8 key[AES_KEYSIZE_128]; 149 struct crypto_sync_skcipher *fallback; 150 }; 151 152 struct sahara_aes_reqctx { 153 unsigned long mode; 154 }; 155 156 /* 157 * struct sahara_sha_reqctx - private data per request 158 * @buf: holds data for requests smaller than block_size 159 * @rembuf: used to prepare one block_size-aligned request 160 * @context: hw-specific context for request. Digest is extracted from this 161 * @mode: specifies what type of hw-descriptor needs to be built 162 * @digest_size: length of digest for this request 163 * @context_size: length of hw-context for this request. 164 * Always digest_size + 4 165 * @buf_cnt: number of bytes saved in buf 166 * @sg_in_idx: number of hw links 167 * @in_sg: scatterlist for input data 168 * @in_sg_chain: scatterlists for chained input data 169 * @total: total number of bytes for transfer 170 * @last: is this the last block 171 * @first: is this the first block 172 * @active: inside a transfer 173 */ 174 struct sahara_sha_reqctx { 175 u8 buf[SAHARA_MAX_SHA_BLOCK_SIZE]; 176 u8 rembuf[SAHARA_MAX_SHA_BLOCK_SIZE]; 177 u8 context[SHA256_DIGEST_SIZE + 4]; 178 unsigned int mode; 179 unsigned int digest_size; 180 unsigned int context_size; 181 unsigned int buf_cnt; 182 unsigned int sg_in_idx; 183 struct scatterlist *in_sg; 184 struct scatterlist in_sg_chain[2]; 185 size_t total; 186 unsigned int last; 187 unsigned int first; 188 unsigned int active; 189 }; 190 191 struct sahara_dev { 192 struct device *device; 193 unsigned int version; 194 void __iomem *regs_base; 195 struct clk *clk_ipg; 196 struct clk *clk_ahb; 197 struct mutex queue_mutex; 198 struct task_struct *kthread; 199 struct completion dma_completion; 200 201 struct sahara_ctx *ctx; 202 struct crypto_queue queue; 203 unsigned long flags; 204 205 struct sahara_hw_desc *hw_desc[SAHARA_MAX_HW_DESC]; 206 dma_addr_t hw_phys_desc[SAHARA_MAX_HW_DESC]; 207 208 u8 *key_base; 209 dma_addr_t key_phys_base; 210 211 u8 *iv_base; 212 dma_addr_t iv_phys_base; 213 214 u8 *context_base; 215 dma_addr_t context_phys_base; 216 217 struct sahara_hw_link *hw_link[SAHARA_MAX_HW_LINK]; 218 dma_addr_t hw_phys_link[SAHARA_MAX_HW_LINK]; 219 220 size_t total; 221 struct scatterlist *in_sg; 222 int nb_in_sg; 223 struct scatterlist *out_sg; 224 int nb_out_sg; 225 226 u32 error; 227 }; 228 229 static struct sahara_dev *dev_ptr; 230 231 static inline void sahara_write(struct sahara_dev *dev, u32 data, u32 reg) 232 { 233 writel(data, dev->regs_base + reg); 234 } 235 236 static inline unsigned int sahara_read(struct sahara_dev *dev, u32 reg) 237 { 238 return readl(dev->regs_base + reg); 239 } 240 241 static u32 sahara_aes_key_hdr(struct sahara_dev *dev) 242 { 243 u32 hdr = SAHARA_HDR_BASE | SAHARA_HDR_SKHA_ALG_AES | 244 SAHARA_HDR_FORM_KEY | SAHARA_HDR_LLO | 245 SAHARA_HDR_CHA_SKHA | SAHARA_HDR_PARITY_BIT; 246 247 if (dev->flags & FLAGS_CBC) { 248 hdr |= SAHARA_HDR_SKHA_MODE_CBC; 249 hdr ^= SAHARA_HDR_PARITY_BIT; 250 } 251 252 if (dev->flags & FLAGS_ENCRYPT) { 253 hdr |= SAHARA_HDR_SKHA_OP_ENC; 254 hdr ^= SAHARA_HDR_PARITY_BIT; 255 } 256 257 return hdr; 258 } 259 260 static u32 sahara_aes_data_link_hdr(struct sahara_dev *dev) 261 { 262 return SAHARA_HDR_BASE | SAHARA_HDR_FORM_DATA | 263 SAHARA_HDR_CHA_SKHA | SAHARA_HDR_PARITY_BIT; 264 } 265 266 static const char *sahara_err_src[16] = { 267 "No error", 268 "Header error", 269 "Descriptor length error", 270 "Descriptor length or pointer error", 271 "Link length error", 272 "Link pointer error", 273 "Input buffer error", 274 "Output buffer error", 275 "Output buffer starvation", 276 "Internal state fault", 277 "General descriptor problem", 278 "Reserved", 279 "Descriptor address error", 280 "Link address error", 281 "CHA error", 282 "DMA error" 283 }; 284 285 static const char *sahara_err_dmasize[4] = { 286 "Byte transfer", 287 "Half-word transfer", 288 "Word transfer", 289 "Reserved" 290 }; 291 292 static const char *sahara_err_dmasrc[8] = { 293 "No error", 294 "AHB bus error", 295 "Internal IP bus error", 296 "Parity error", 297 "DMA crosses 256 byte boundary", 298 "DMA is busy", 299 "Reserved", 300 "DMA HW error" 301 }; 302 303 static const char *sahara_cha_errsrc[12] = { 304 "Input buffer non-empty", 305 "Illegal address", 306 "Illegal mode", 307 "Illegal data size", 308 "Illegal key size", 309 "Write during processing", 310 "CTX read during processing", 311 "HW error", 312 "Input buffer disabled/underflow", 313 "Output buffer disabled/overflow", 314 "DES key parity error", 315 "Reserved" 316 }; 317 318 static const char *sahara_cha_err[4] = { "No error", "SKHA", "MDHA", "RNG" }; 319 320 static void sahara_decode_error(struct sahara_dev *dev, unsigned int error) 321 { 322 u8 source = SAHARA_ERRSTATUS_GET_SOURCE(error); 323 u16 chasrc = ffs(SAHARA_ERRSTATUS_GET_CHASRC(error)); 324 325 dev_err(dev->device, "%s: Error Register = 0x%08x\n", __func__, error); 326 327 dev_err(dev->device, " - %s.\n", sahara_err_src[source]); 328 329 if (source == SAHARA_ERRSOURCE_DMA) { 330 if (error & SAHARA_ERRSTATUS_DMA_DIR) 331 dev_err(dev->device, " * DMA read.\n"); 332 else 333 dev_err(dev->device, " * DMA write.\n"); 334 335 dev_err(dev->device, " * %s.\n", 336 sahara_err_dmasize[SAHARA_ERRSTATUS_GET_DMASZ(error)]); 337 dev_err(dev->device, " * %s.\n", 338 sahara_err_dmasrc[SAHARA_ERRSTATUS_GET_DMASRC(error)]); 339 } else if (source == SAHARA_ERRSOURCE_CHA) { 340 dev_err(dev->device, " * %s.\n", 341 sahara_cha_errsrc[chasrc]); 342 dev_err(dev->device, " * %s.\n", 343 sahara_cha_err[SAHARA_ERRSTATUS_GET_CHAERR(error)]); 344 } 345 dev_err(dev->device, "\n"); 346 } 347 348 static const char *sahara_state[4] = { "Idle", "Busy", "Error", "HW Fault" }; 349 350 static void sahara_decode_status(struct sahara_dev *dev, unsigned int status) 351 { 352 u8 state; 353 354 if (!__is_defined(DEBUG)) 355 return; 356 357 state = SAHARA_STATUS_GET_STATE(status); 358 359 dev_dbg(dev->device, "%s: Status Register = 0x%08x\n", 360 __func__, status); 361 362 dev_dbg(dev->device, " - State = %d:\n", state); 363 if (state & SAHARA_STATE_COMP_FLAG) 364 dev_dbg(dev->device, " * Descriptor completed. IRQ pending.\n"); 365 366 dev_dbg(dev->device, " * %s.\n", 367 sahara_state[state & ~SAHARA_STATE_COMP_FLAG]); 368 369 if (status & SAHARA_STATUS_DAR_FULL) 370 dev_dbg(dev->device, " - DAR Full.\n"); 371 if (status & SAHARA_STATUS_ERROR) 372 dev_dbg(dev->device, " - Error.\n"); 373 if (status & SAHARA_STATUS_SECURE) 374 dev_dbg(dev->device, " - Secure.\n"); 375 if (status & SAHARA_STATUS_FAIL) 376 dev_dbg(dev->device, " - Fail.\n"); 377 if (status & SAHARA_STATUS_RNG_RESEED) 378 dev_dbg(dev->device, " - RNG Reseed Request.\n"); 379 if (status & SAHARA_STATUS_ACTIVE_RNG) 380 dev_dbg(dev->device, " - RNG Active.\n"); 381 if (status & SAHARA_STATUS_ACTIVE_MDHA) 382 dev_dbg(dev->device, " - MDHA Active.\n"); 383 if (status & SAHARA_STATUS_ACTIVE_SKHA) 384 dev_dbg(dev->device, " - SKHA Active.\n"); 385 386 if (status & SAHARA_STATUS_MODE_BATCH) 387 dev_dbg(dev->device, " - Batch Mode.\n"); 388 else if (status & SAHARA_STATUS_MODE_DEDICATED) 389 dev_dbg(dev->device, " - Dedicated Mode.\n"); 390 else if (status & SAHARA_STATUS_MODE_DEBUG) 391 dev_dbg(dev->device, " - Debug Mode.\n"); 392 393 dev_dbg(dev->device, " - Internal state = 0x%02x\n", 394 SAHARA_STATUS_GET_ISTATE(status)); 395 396 dev_dbg(dev->device, "Current DAR: 0x%08x\n", 397 sahara_read(dev, SAHARA_REG_CDAR)); 398 dev_dbg(dev->device, "Initial DAR: 0x%08x\n\n", 399 sahara_read(dev, SAHARA_REG_IDAR)); 400 } 401 402 static void sahara_dump_descriptors(struct sahara_dev *dev) 403 { 404 int i; 405 406 if (!__is_defined(DEBUG)) 407 return; 408 409 for (i = 0; i < SAHARA_MAX_HW_DESC; i++) { 410 dev_dbg(dev->device, "Descriptor (%d) (%pad):\n", 411 i, &dev->hw_phys_desc[i]); 412 dev_dbg(dev->device, "\thdr = 0x%08x\n", dev->hw_desc[i]->hdr); 413 dev_dbg(dev->device, "\tlen1 = %u\n", dev->hw_desc[i]->len1); 414 dev_dbg(dev->device, "\tp1 = 0x%08x\n", dev->hw_desc[i]->p1); 415 dev_dbg(dev->device, "\tlen2 = %u\n", dev->hw_desc[i]->len2); 416 dev_dbg(dev->device, "\tp2 = 0x%08x\n", dev->hw_desc[i]->p2); 417 dev_dbg(dev->device, "\tnext = 0x%08x\n", 418 dev->hw_desc[i]->next); 419 } 420 dev_dbg(dev->device, "\n"); 421 } 422 423 static void sahara_dump_links(struct sahara_dev *dev) 424 { 425 int i; 426 427 if (!__is_defined(DEBUG)) 428 return; 429 430 for (i = 0; i < SAHARA_MAX_HW_LINK; i++) { 431 dev_dbg(dev->device, "Link (%d) (%pad):\n", 432 i, &dev->hw_phys_link[i]); 433 dev_dbg(dev->device, "\tlen = %u\n", dev->hw_link[i]->len); 434 dev_dbg(dev->device, "\tp = 0x%08x\n", dev->hw_link[i]->p); 435 dev_dbg(dev->device, "\tnext = 0x%08x\n", 436 dev->hw_link[i]->next); 437 } 438 dev_dbg(dev->device, "\n"); 439 } 440 441 static int sahara_hw_descriptor_create(struct sahara_dev *dev) 442 { 443 struct sahara_ctx *ctx = dev->ctx; 444 struct scatterlist *sg; 445 int ret; 446 int i, j; 447 int idx = 0; 448 449 /* Copy new key if necessary */ 450 if (ctx->flags & FLAGS_NEW_KEY) { 451 memcpy(dev->key_base, ctx->key, ctx->keylen); 452 ctx->flags &= ~FLAGS_NEW_KEY; 453 454 if (dev->flags & FLAGS_CBC) { 455 dev->hw_desc[idx]->len1 = AES_BLOCK_SIZE; 456 dev->hw_desc[idx]->p1 = dev->iv_phys_base; 457 } else { 458 dev->hw_desc[idx]->len1 = 0; 459 dev->hw_desc[idx]->p1 = 0; 460 } 461 dev->hw_desc[idx]->len2 = ctx->keylen; 462 dev->hw_desc[idx]->p2 = dev->key_phys_base; 463 dev->hw_desc[idx]->next = dev->hw_phys_desc[1]; 464 465 dev->hw_desc[idx]->hdr = sahara_aes_key_hdr(dev); 466 467 idx++; 468 } 469 470 dev->nb_in_sg = sg_nents_for_len(dev->in_sg, dev->total); 471 if (dev->nb_in_sg < 0) { 472 dev_err(dev->device, "Invalid numbers of src SG.\n"); 473 return dev->nb_in_sg; 474 } 475 dev->nb_out_sg = sg_nents_for_len(dev->out_sg, dev->total); 476 if (dev->nb_out_sg < 0) { 477 dev_err(dev->device, "Invalid numbers of dst SG.\n"); 478 return dev->nb_out_sg; 479 } 480 if ((dev->nb_in_sg + dev->nb_out_sg) > SAHARA_MAX_HW_LINK) { 481 dev_err(dev->device, "not enough hw links (%d)\n", 482 dev->nb_in_sg + dev->nb_out_sg); 483 return -EINVAL; 484 } 485 486 ret = dma_map_sg(dev->device, dev->in_sg, dev->nb_in_sg, 487 DMA_TO_DEVICE); 488 if (ret != dev->nb_in_sg) { 489 dev_err(dev->device, "couldn't map in sg\n"); 490 goto unmap_in; 491 } 492 ret = dma_map_sg(dev->device, dev->out_sg, dev->nb_out_sg, 493 DMA_FROM_DEVICE); 494 if (ret != dev->nb_out_sg) { 495 dev_err(dev->device, "couldn't map out sg\n"); 496 goto unmap_out; 497 } 498 499 /* Create input links */ 500 dev->hw_desc[idx]->p1 = dev->hw_phys_link[0]; 501 sg = dev->in_sg; 502 for (i = 0; i < dev->nb_in_sg; i++) { 503 dev->hw_link[i]->len = sg->length; 504 dev->hw_link[i]->p = sg->dma_address; 505 if (i == (dev->nb_in_sg - 1)) { 506 dev->hw_link[i]->next = 0; 507 } else { 508 dev->hw_link[i]->next = dev->hw_phys_link[i + 1]; 509 sg = sg_next(sg); 510 } 511 } 512 513 /* Create output links */ 514 dev->hw_desc[idx]->p2 = dev->hw_phys_link[i]; 515 sg = dev->out_sg; 516 for (j = i; j < dev->nb_out_sg + i; j++) { 517 dev->hw_link[j]->len = sg->length; 518 dev->hw_link[j]->p = sg->dma_address; 519 if (j == (dev->nb_out_sg + i - 1)) { 520 dev->hw_link[j]->next = 0; 521 } else { 522 dev->hw_link[j]->next = dev->hw_phys_link[j + 1]; 523 sg = sg_next(sg); 524 } 525 } 526 527 /* Fill remaining fields of hw_desc[1] */ 528 dev->hw_desc[idx]->hdr = sahara_aes_data_link_hdr(dev); 529 dev->hw_desc[idx]->len1 = dev->total; 530 dev->hw_desc[idx]->len2 = dev->total; 531 dev->hw_desc[idx]->next = 0; 532 533 sahara_dump_descriptors(dev); 534 sahara_dump_links(dev); 535 536 sahara_write(dev, dev->hw_phys_desc[0], SAHARA_REG_DAR); 537 538 return 0; 539 540 unmap_out: 541 dma_unmap_sg(dev->device, dev->out_sg, dev->nb_out_sg, 542 DMA_FROM_DEVICE); 543 unmap_in: 544 dma_unmap_sg(dev->device, dev->in_sg, dev->nb_in_sg, 545 DMA_TO_DEVICE); 546 547 return -EINVAL; 548 } 549 550 static int sahara_aes_process(struct ablkcipher_request *req) 551 { 552 struct sahara_dev *dev = dev_ptr; 553 struct sahara_ctx *ctx; 554 struct sahara_aes_reqctx *rctx; 555 int ret; 556 unsigned long timeout; 557 558 /* Request is ready to be dispatched by the device */ 559 dev_dbg(dev->device, 560 "dispatch request (nbytes=%d, src=%p, dst=%p)\n", 561 req->nbytes, req->src, req->dst); 562 563 /* assign new request to device */ 564 dev->total = req->nbytes; 565 dev->in_sg = req->src; 566 dev->out_sg = req->dst; 567 568 rctx = ablkcipher_request_ctx(req); 569 ctx = crypto_ablkcipher_ctx(crypto_ablkcipher_reqtfm(req)); 570 rctx->mode &= FLAGS_MODE_MASK; 571 dev->flags = (dev->flags & ~FLAGS_MODE_MASK) | rctx->mode; 572 573 if ((dev->flags & FLAGS_CBC) && req->info) 574 memcpy(dev->iv_base, req->info, AES_KEYSIZE_128); 575 576 /* assign new context to device */ 577 dev->ctx = ctx; 578 579 reinit_completion(&dev->dma_completion); 580 581 ret = sahara_hw_descriptor_create(dev); 582 if (ret) 583 return -EINVAL; 584 585 timeout = wait_for_completion_timeout(&dev->dma_completion, 586 msecs_to_jiffies(SAHARA_TIMEOUT_MS)); 587 if (!timeout) { 588 dev_err(dev->device, "AES timeout\n"); 589 return -ETIMEDOUT; 590 } 591 592 dma_unmap_sg(dev->device, dev->out_sg, dev->nb_out_sg, 593 DMA_FROM_DEVICE); 594 dma_unmap_sg(dev->device, dev->in_sg, dev->nb_in_sg, 595 DMA_TO_DEVICE); 596 597 return 0; 598 } 599 600 static int sahara_aes_setkey(struct crypto_ablkcipher *tfm, const u8 *key, 601 unsigned int keylen) 602 { 603 struct sahara_ctx *ctx = crypto_ablkcipher_ctx(tfm); 604 int ret; 605 606 ctx->keylen = keylen; 607 608 /* SAHARA only supports 128bit keys */ 609 if (keylen == AES_KEYSIZE_128) { 610 memcpy(ctx->key, key, keylen); 611 ctx->flags |= FLAGS_NEW_KEY; 612 return 0; 613 } 614 615 if (keylen != AES_KEYSIZE_192 && keylen != AES_KEYSIZE_256) 616 return -EINVAL; 617 618 /* 619 * The requested key size is not supported by HW, do a fallback. 620 */ 621 crypto_sync_skcipher_clear_flags(ctx->fallback, CRYPTO_TFM_REQ_MASK); 622 crypto_sync_skcipher_set_flags(ctx->fallback, tfm->base.crt_flags & 623 CRYPTO_TFM_REQ_MASK); 624 625 ret = crypto_sync_skcipher_setkey(ctx->fallback, key, keylen); 626 627 tfm->base.crt_flags &= ~CRYPTO_TFM_RES_MASK; 628 tfm->base.crt_flags |= crypto_sync_skcipher_get_flags(ctx->fallback) & 629 CRYPTO_TFM_RES_MASK; 630 return ret; 631 } 632 633 static int sahara_aes_crypt(struct ablkcipher_request *req, unsigned long mode) 634 { 635 struct sahara_aes_reqctx *rctx = ablkcipher_request_ctx(req); 636 struct sahara_dev *dev = dev_ptr; 637 int err = 0; 638 639 dev_dbg(dev->device, "nbytes: %d, enc: %d, cbc: %d\n", 640 req->nbytes, !!(mode & FLAGS_ENCRYPT), !!(mode & FLAGS_CBC)); 641 642 if (!IS_ALIGNED(req->nbytes, AES_BLOCK_SIZE)) { 643 dev_err(dev->device, 644 "request size is not exact amount of AES blocks\n"); 645 return -EINVAL; 646 } 647 648 rctx->mode = mode; 649 650 mutex_lock(&dev->queue_mutex); 651 err = ablkcipher_enqueue_request(&dev->queue, req); 652 mutex_unlock(&dev->queue_mutex); 653 654 wake_up_process(dev->kthread); 655 656 return err; 657 } 658 659 static int sahara_aes_ecb_encrypt(struct ablkcipher_request *req) 660 { 661 struct sahara_ctx *ctx = crypto_ablkcipher_ctx( 662 crypto_ablkcipher_reqtfm(req)); 663 int err; 664 665 if (unlikely(ctx->keylen != AES_KEYSIZE_128)) { 666 SYNC_SKCIPHER_REQUEST_ON_STACK(subreq, ctx->fallback); 667 668 skcipher_request_set_sync_tfm(subreq, ctx->fallback); 669 skcipher_request_set_callback(subreq, req->base.flags, 670 NULL, NULL); 671 skcipher_request_set_crypt(subreq, req->src, req->dst, 672 req->nbytes, req->info); 673 err = crypto_skcipher_encrypt(subreq); 674 skcipher_request_zero(subreq); 675 return err; 676 } 677 678 return sahara_aes_crypt(req, FLAGS_ENCRYPT); 679 } 680 681 static int sahara_aes_ecb_decrypt(struct ablkcipher_request *req) 682 { 683 struct sahara_ctx *ctx = crypto_ablkcipher_ctx( 684 crypto_ablkcipher_reqtfm(req)); 685 int err; 686 687 if (unlikely(ctx->keylen != AES_KEYSIZE_128)) { 688 SYNC_SKCIPHER_REQUEST_ON_STACK(subreq, ctx->fallback); 689 690 skcipher_request_set_sync_tfm(subreq, ctx->fallback); 691 skcipher_request_set_callback(subreq, req->base.flags, 692 NULL, NULL); 693 skcipher_request_set_crypt(subreq, req->src, req->dst, 694 req->nbytes, req->info); 695 err = crypto_skcipher_decrypt(subreq); 696 skcipher_request_zero(subreq); 697 return err; 698 } 699 700 return sahara_aes_crypt(req, 0); 701 } 702 703 static int sahara_aes_cbc_encrypt(struct ablkcipher_request *req) 704 { 705 struct sahara_ctx *ctx = crypto_ablkcipher_ctx( 706 crypto_ablkcipher_reqtfm(req)); 707 int err; 708 709 if (unlikely(ctx->keylen != AES_KEYSIZE_128)) { 710 SYNC_SKCIPHER_REQUEST_ON_STACK(subreq, ctx->fallback); 711 712 skcipher_request_set_sync_tfm(subreq, ctx->fallback); 713 skcipher_request_set_callback(subreq, req->base.flags, 714 NULL, NULL); 715 skcipher_request_set_crypt(subreq, req->src, req->dst, 716 req->nbytes, req->info); 717 err = crypto_skcipher_encrypt(subreq); 718 skcipher_request_zero(subreq); 719 return err; 720 } 721 722 return sahara_aes_crypt(req, FLAGS_ENCRYPT | FLAGS_CBC); 723 } 724 725 static int sahara_aes_cbc_decrypt(struct ablkcipher_request *req) 726 { 727 struct sahara_ctx *ctx = crypto_ablkcipher_ctx( 728 crypto_ablkcipher_reqtfm(req)); 729 int err; 730 731 if (unlikely(ctx->keylen != AES_KEYSIZE_128)) { 732 SYNC_SKCIPHER_REQUEST_ON_STACK(subreq, ctx->fallback); 733 734 skcipher_request_set_sync_tfm(subreq, ctx->fallback); 735 skcipher_request_set_callback(subreq, req->base.flags, 736 NULL, NULL); 737 skcipher_request_set_crypt(subreq, req->src, req->dst, 738 req->nbytes, req->info); 739 err = crypto_skcipher_decrypt(subreq); 740 skcipher_request_zero(subreq); 741 return err; 742 } 743 744 return sahara_aes_crypt(req, FLAGS_CBC); 745 } 746 747 static int sahara_aes_cra_init(struct crypto_tfm *tfm) 748 { 749 const char *name = crypto_tfm_alg_name(tfm); 750 struct sahara_ctx *ctx = crypto_tfm_ctx(tfm); 751 752 ctx->fallback = crypto_alloc_sync_skcipher(name, 0, 753 CRYPTO_ALG_NEED_FALLBACK); 754 if (IS_ERR(ctx->fallback)) { 755 pr_err("Error allocating fallback algo %s\n", name); 756 return PTR_ERR(ctx->fallback); 757 } 758 759 tfm->crt_ablkcipher.reqsize = sizeof(struct sahara_aes_reqctx); 760 761 return 0; 762 } 763 764 static void sahara_aes_cra_exit(struct crypto_tfm *tfm) 765 { 766 struct sahara_ctx *ctx = crypto_tfm_ctx(tfm); 767 768 crypto_free_sync_skcipher(ctx->fallback); 769 } 770 771 static u32 sahara_sha_init_hdr(struct sahara_dev *dev, 772 struct sahara_sha_reqctx *rctx) 773 { 774 u32 hdr = 0; 775 776 hdr = rctx->mode; 777 778 if (rctx->first) { 779 hdr |= SAHARA_HDR_MDHA_SET_MODE_HASH; 780 hdr |= SAHARA_HDR_MDHA_INIT; 781 } else { 782 hdr |= SAHARA_HDR_MDHA_SET_MODE_MD_KEY; 783 } 784 785 if (rctx->last) 786 hdr |= SAHARA_HDR_MDHA_PDATA; 787 788 if (hweight_long(hdr) % 2 == 0) 789 hdr |= SAHARA_HDR_PARITY_BIT; 790 791 return hdr; 792 } 793 794 static int sahara_sha_hw_links_create(struct sahara_dev *dev, 795 struct sahara_sha_reqctx *rctx, 796 int start) 797 { 798 struct scatterlist *sg; 799 unsigned int i; 800 int ret; 801 802 dev->in_sg = rctx->in_sg; 803 804 dev->nb_in_sg = sg_nents_for_len(dev->in_sg, rctx->total); 805 if (dev->nb_in_sg < 0) { 806 dev_err(dev->device, "Invalid numbers of src SG.\n"); 807 return dev->nb_in_sg; 808 } 809 if ((dev->nb_in_sg) > SAHARA_MAX_HW_LINK) { 810 dev_err(dev->device, "not enough hw links (%d)\n", 811 dev->nb_in_sg + dev->nb_out_sg); 812 return -EINVAL; 813 } 814 815 sg = dev->in_sg; 816 ret = dma_map_sg(dev->device, dev->in_sg, dev->nb_in_sg, DMA_TO_DEVICE); 817 if (!ret) 818 return -EFAULT; 819 820 for (i = start; i < dev->nb_in_sg + start; i++) { 821 dev->hw_link[i]->len = sg->length; 822 dev->hw_link[i]->p = sg->dma_address; 823 if (i == (dev->nb_in_sg + start - 1)) { 824 dev->hw_link[i]->next = 0; 825 } else { 826 dev->hw_link[i]->next = dev->hw_phys_link[i + 1]; 827 sg = sg_next(sg); 828 } 829 } 830 831 return i; 832 } 833 834 static int sahara_sha_hw_data_descriptor_create(struct sahara_dev *dev, 835 struct sahara_sha_reqctx *rctx, 836 struct ahash_request *req, 837 int index) 838 { 839 unsigned result_len; 840 int i = index; 841 842 if (rctx->first) 843 /* Create initial descriptor: #8*/ 844 dev->hw_desc[index]->hdr = sahara_sha_init_hdr(dev, rctx); 845 else 846 /* Create hash descriptor: #10. Must follow #6. */ 847 dev->hw_desc[index]->hdr = SAHARA_HDR_MDHA_HASH; 848 849 dev->hw_desc[index]->len1 = rctx->total; 850 if (dev->hw_desc[index]->len1 == 0) { 851 /* if len1 is 0, p1 must be 0, too */ 852 dev->hw_desc[index]->p1 = 0; 853 rctx->sg_in_idx = 0; 854 } else { 855 /* Create input links */ 856 dev->hw_desc[index]->p1 = dev->hw_phys_link[index]; 857 i = sahara_sha_hw_links_create(dev, rctx, index); 858 859 rctx->sg_in_idx = index; 860 if (i < 0) 861 return i; 862 } 863 864 dev->hw_desc[index]->p2 = dev->hw_phys_link[i]; 865 866 /* Save the context for the next operation */ 867 result_len = rctx->context_size; 868 dev->hw_link[i]->p = dev->context_phys_base; 869 870 dev->hw_link[i]->len = result_len; 871 dev->hw_desc[index]->len2 = result_len; 872 873 dev->hw_link[i]->next = 0; 874 875 return 0; 876 } 877 878 /* 879 * Load descriptor aka #6 880 * 881 * To load a previously saved context back to the MDHA unit 882 * 883 * p1: Saved Context 884 * p2: NULL 885 * 886 */ 887 static int sahara_sha_hw_context_descriptor_create(struct sahara_dev *dev, 888 struct sahara_sha_reqctx *rctx, 889 struct ahash_request *req, 890 int index) 891 { 892 dev->hw_desc[index]->hdr = sahara_sha_init_hdr(dev, rctx); 893 894 dev->hw_desc[index]->len1 = rctx->context_size; 895 dev->hw_desc[index]->p1 = dev->hw_phys_link[index]; 896 dev->hw_desc[index]->len2 = 0; 897 dev->hw_desc[index]->p2 = 0; 898 899 dev->hw_link[index]->len = rctx->context_size; 900 dev->hw_link[index]->p = dev->context_phys_base; 901 dev->hw_link[index]->next = 0; 902 903 return 0; 904 } 905 906 static int sahara_walk_and_recalc(struct scatterlist *sg, unsigned int nbytes) 907 { 908 if (!sg || !sg->length) 909 return nbytes; 910 911 while (nbytes && sg) { 912 if (nbytes <= sg->length) { 913 sg->length = nbytes; 914 sg_mark_end(sg); 915 break; 916 } 917 nbytes -= sg->length; 918 sg = sg_next(sg); 919 } 920 921 return nbytes; 922 } 923 924 static int sahara_sha_prepare_request(struct ahash_request *req) 925 { 926 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); 927 struct sahara_sha_reqctx *rctx = ahash_request_ctx(req); 928 unsigned int hash_later; 929 unsigned int block_size; 930 unsigned int len; 931 932 block_size = crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm)); 933 934 /* append bytes from previous operation */ 935 len = rctx->buf_cnt + req->nbytes; 936 937 /* only the last transfer can be padded in hardware */ 938 if (!rctx->last && (len < block_size)) { 939 /* to few data, save for next operation */ 940 scatterwalk_map_and_copy(rctx->buf + rctx->buf_cnt, req->src, 941 0, req->nbytes, 0); 942 rctx->buf_cnt += req->nbytes; 943 944 return 0; 945 } 946 947 /* add data from previous operation first */ 948 if (rctx->buf_cnt) 949 memcpy(rctx->rembuf, rctx->buf, rctx->buf_cnt); 950 951 /* data must always be a multiple of block_size */ 952 hash_later = rctx->last ? 0 : len & (block_size - 1); 953 if (hash_later) { 954 unsigned int offset = req->nbytes - hash_later; 955 /* Save remaining bytes for later use */ 956 scatterwalk_map_and_copy(rctx->buf, req->src, offset, 957 hash_later, 0); 958 } 959 960 /* nbytes should now be multiple of blocksize */ 961 req->nbytes = req->nbytes - hash_later; 962 963 sahara_walk_and_recalc(req->src, req->nbytes); 964 965 /* have data from previous operation and current */ 966 if (rctx->buf_cnt && req->nbytes) { 967 sg_init_table(rctx->in_sg_chain, 2); 968 sg_set_buf(rctx->in_sg_chain, rctx->rembuf, rctx->buf_cnt); 969 970 sg_chain(rctx->in_sg_chain, 2, req->src); 971 972 rctx->total = req->nbytes + rctx->buf_cnt; 973 rctx->in_sg = rctx->in_sg_chain; 974 975 req->src = rctx->in_sg_chain; 976 /* only data from previous operation */ 977 } else if (rctx->buf_cnt) { 978 if (req->src) 979 rctx->in_sg = req->src; 980 else 981 rctx->in_sg = rctx->in_sg_chain; 982 /* buf was copied into rembuf above */ 983 sg_init_one(rctx->in_sg, rctx->rembuf, rctx->buf_cnt); 984 rctx->total = rctx->buf_cnt; 985 /* no data from previous operation */ 986 } else { 987 rctx->in_sg = req->src; 988 rctx->total = req->nbytes; 989 req->src = rctx->in_sg; 990 } 991 992 /* on next call, we only have the remaining data in the buffer */ 993 rctx->buf_cnt = hash_later; 994 995 return -EINPROGRESS; 996 } 997 998 static int sahara_sha_process(struct ahash_request *req) 999 { 1000 struct sahara_dev *dev = dev_ptr; 1001 struct sahara_sha_reqctx *rctx = ahash_request_ctx(req); 1002 int ret; 1003 unsigned long timeout; 1004 1005 ret = sahara_sha_prepare_request(req); 1006 if (!ret) 1007 return ret; 1008 1009 if (rctx->first) { 1010 sahara_sha_hw_data_descriptor_create(dev, rctx, req, 0); 1011 dev->hw_desc[0]->next = 0; 1012 rctx->first = 0; 1013 } else { 1014 memcpy(dev->context_base, rctx->context, rctx->context_size); 1015 1016 sahara_sha_hw_context_descriptor_create(dev, rctx, req, 0); 1017 dev->hw_desc[0]->next = dev->hw_phys_desc[1]; 1018 sahara_sha_hw_data_descriptor_create(dev, rctx, req, 1); 1019 dev->hw_desc[1]->next = 0; 1020 } 1021 1022 sahara_dump_descriptors(dev); 1023 sahara_dump_links(dev); 1024 1025 reinit_completion(&dev->dma_completion); 1026 1027 sahara_write(dev, dev->hw_phys_desc[0], SAHARA_REG_DAR); 1028 1029 timeout = wait_for_completion_timeout(&dev->dma_completion, 1030 msecs_to_jiffies(SAHARA_TIMEOUT_MS)); 1031 if (!timeout) { 1032 dev_err(dev->device, "SHA timeout\n"); 1033 return -ETIMEDOUT; 1034 } 1035 1036 if (rctx->sg_in_idx) 1037 dma_unmap_sg(dev->device, dev->in_sg, dev->nb_in_sg, 1038 DMA_TO_DEVICE); 1039 1040 memcpy(rctx->context, dev->context_base, rctx->context_size); 1041 1042 if (req->result) 1043 memcpy(req->result, rctx->context, rctx->digest_size); 1044 1045 return 0; 1046 } 1047 1048 static int sahara_queue_manage(void *data) 1049 { 1050 struct sahara_dev *dev = (struct sahara_dev *)data; 1051 struct crypto_async_request *async_req; 1052 struct crypto_async_request *backlog; 1053 int ret = 0; 1054 1055 do { 1056 __set_current_state(TASK_INTERRUPTIBLE); 1057 1058 mutex_lock(&dev->queue_mutex); 1059 backlog = crypto_get_backlog(&dev->queue); 1060 async_req = crypto_dequeue_request(&dev->queue); 1061 mutex_unlock(&dev->queue_mutex); 1062 1063 if (backlog) 1064 backlog->complete(backlog, -EINPROGRESS); 1065 1066 if (async_req) { 1067 if (crypto_tfm_alg_type(async_req->tfm) == 1068 CRYPTO_ALG_TYPE_AHASH) { 1069 struct ahash_request *req = 1070 ahash_request_cast(async_req); 1071 1072 ret = sahara_sha_process(req); 1073 } else { 1074 struct ablkcipher_request *req = 1075 ablkcipher_request_cast(async_req); 1076 1077 ret = sahara_aes_process(req); 1078 } 1079 1080 async_req->complete(async_req, ret); 1081 1082 continue; 1083 } 1084 1085 schedule(); 1086 } while (!kthread_should_stop()); 1087 1088 return 0; 1089 } 1090 1091 static int sahara_sha_enqueue(struct ahash_request *req, int last) 1092 { 1093 struct sahara_sha_reqctx *rctx = ahash_request_ctx(req); 1094 struct sahara_dev *dev = dev_ptr; 1095 int ret; 1096 1097 if (!req->nbytes && !last) 1098 return 0; 1099 1100 rctx->last = last; 1101 1102 if (!rctx->active) { 1103 rctx->active = 1; 1104 rctx->first = 1; 1105 } 1106 1107 mutex_lock(&dev->queue_mutex); 1108 ret = crypto_enqueue_request(&dev->queue, &req->base); 1109 mutex_unlock(&dev->queue_mutex); 1110 1111 wake_up_process(dev->kthread); 1112 1113 return ret; 1114 } 1115 1116 static int sahara_sha_init(struct ahash_request *req) 1117 { 1118 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); 1119 struct sahara_sha_reqctx *rctx = ahash_request_ctx(req); 1120 1121 memset(rctx, 0, sizeof(*rctx)); 1122 1123 switch (crypto_ahash_digestsize(tfm)) { 1124 case SHA1_DIGEST_SIZE: 1125 rctx->mode |= SAHARA_HDR_MDHA_ALG_SHA1; 1126 rctx->digest_size = SHA1_DIGEST_SIZE; 1127 break; 1128 case SHA256_DIGEST_SIZE: 1129 rctx->mode |= SAHARA_HDR_MDHA_ALG_SHA256; 1130 rctx->digest_size = SHA256_DIGEST_SIZE; 1131 break; 1132 default: 1133 return -EINVAL; 1134 } 1135 1136 rctx->context_size = rctx->digest_size + 4; 1137 rctx->active = 0; 1138 1139 return 0; 1140 } 1141 1142 static int sahara_sha_update(struct ahash_request *req) 1143 { 1144 return sahara_sha_enqueue(req, 0); 1145 } 1146 1147 static int sahara_sha_final(struct ahash_request *req) 1148 { 1149 req->nbytes = 0; 1150 return sahara_sha_enqueue(req, 1); 1151 } 1152 1153 static int sahara_sha_finup(struct ahash_request *req) 1154 { 1155 return sahara_sha_enqueue(req, 1); 1156 } 1157 1158 static int sahara_sha_digest(struct ahash_request *req) 1159 { 1160 sahara_sha_init(req); 1161 1162 return sahara_sha_finup(req); 1163 } 1164 1165 static int sahara_sha_export(struct ahash_request *req, void *out) 1166 { 1167 struct sahara_sha_reqctx *rctx = ahash_request_ctx(req); 1168 1169 memcpy(out, rctx, sizeof(struct sahara_sha_reqctx)); 1170 1171 return 0; 1172 } 1173 1174 static int sahara_sha_import(struct ahash_request *req, const void *in) 1175 { 1176 struct sahara_sha_reqctx *rctx = ahash_request_ctx(req); 1177 1178 memcpy(rctx, in, sizeof(struct sahara_sha_reqctx)); 1179 1180 return 0; 1181 } 1182 1183 static int sahara_sha_cra_init(struct crypto_tfm *tfm) 1184 { 1185 crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm), 1186 sizeof(struct sahara_sha_reqctx) + 1187 SHA_BUFFER_LEN + SHA256_BLOCK_SIZE); 1188 1189 return 0; 1190 } 1191 1192 static struct crypto_alg aes_algs[] = { 1193 { 1194 .cra_name = "ecb(aes)", 1195 .cra_driver_name = "sahara-ecb-aes", 1196 .cra_priority = 300, 1197 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | 1198 CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK, 1199 .cra_blocksize = AES_BLOCK_SIZE, 1200 .cra_ctxsize = sizeof(struct sahara_ctx), 1201 .cra_alignmask = 0x0, 1202 .cra_type = &crypto_ablkcipher_type, 1203 .cra_module = THIS_MODULE, 1204 .cra_init = sahara_aes_cra_init, 1205 .cra_exit = sahara_aes_cra_exit, 1206 .cra_u.ablkcipher = { 1207 .min_keysize = AES_MIN_KEY_SIZE , 1208 .max_keysize = AES_MAX_KEY_SIZE, 1209 .setkey = sahara_aes_setkey, 1210 .encrypt = sahara_aes_ecb_encrypt, 1211 .decrypt = sahara_aes_ecb_decrypt, 1212 } 1213 }, { 1214 .cra_name = "cbc(aes)", 1215 .cra_driver_name = "sahara-cbc-aes", 1216 .cra_priority = 300, 1217 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | 1218 CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK, 1219 .cra_blocksize = AES_BLOCK_SIZE, 1220 .cra_ctxsize = sizeof(struct sahara_ctx), 1221 .cra_alignmask = 0x0, 1222 .cra_type = &crypto_ablkcipher_type, 1223 .cra_module = THIS_MODULE, 1224 .cra_init = sahara_aes_cra_init, 1225 .cra_exit = sahara_aes_cra_exit, 1226 .cra_u.ablkcipher = { 1227 .min_keysize = AES_MIN_KEY_SIZE , 1228 .max_keysize = AES_MAX_KEY_SIZE, 1229 .ivsize = AES_BLOCK_SIZE, 1230 .setkey = sahara_aes_setkey, 1231 .encrypt = sahara_aes_cbc_encrypt, 1232 .decrypt = sahara_aes_cbc_decrypt, 1233 } 1234 } 1235 }; 1236 1237 static struct ahash_alg sha_v3_algs[] = { 1238 { 1239 .init = sahara_sha_init, 1240 .update = sahara_sha_update, 1241 .final = sahara_sha_final, 1242 .finup = sahara_sha_finup, 1243 .digest = sahara_sha_digest, 1244 .export = sahara_sha_export, 1245 .import = sahara_sha_import, 1246 .halg.digestsize = SHA1_DIGEST_SIZE, 1247 .halg.statesize = sizeof(struct sahara_sha_reqctx), 1248 .halg.base = { 1249 .cra_name = "sha1", 1250 .cra_driver_name = "sahara-sha1", 1251 .cra_priority = 300, 1252 .cra_flags = CRYPTO_ALG_ASYNC | 1253 CRYPTO_ALG_NEED_FALLBACK, 1254 .cra_blocksize = SHA1_BLOCK_SIZE, 1255 .cra_ctxsize = sizeof(struct sahara_ctx), 1256 .cra_alignmask = 0, 1257 .cra_module = THIS_MODULE, 1258 .cra_init = sahara_sha_cra_init, 1259 } 1260 }, 1261 }; 1262 1263 static struct ahash_alg sha_v4_algs[] = { 1264 { 1265 .init = sahara_sha_init, 1266 .update = sahara_sha_update, 1267 .final = sahara_sha_final, 1268 .finup = sahara_sha_finup, 1269 .digest = sahara_sha_digest, 1270 .export = sahara_sha_export, 1271 .import = sahara_sha_import, 1272 .halg.digestsize = SHA256_DIGEST_SIZE, 1273 .halg.statesize = sizeof(struct sahara_sha_reqctx), 1274 .halg.base = { 1275 .cra_name = "sha256", 1276 .cra_driver_name = "sahara-sha256", 1277 .cra_priority = 300, 1278 .cra_flags = CRYPTO_ALG_ASYNC | 1279 CRYPTO_ALG_NEED_FALLBACK, 1280 .cra_blocksize = SHA256_BLOCK_SIZE, 1281 .cra_ctxsize = sizeof(struct sahara_ctx), 1282 .cra_alignmask = 0, 1283 .cra_module = THIS_MODULE, 1284 .cra_init = sahara_sha_cra_init, 1285 } 1286 }, 1287 }; 1288 1289 static irqreturn_t sahara_irq_handler(int irq, void *data) 1290 { 1291 struct sahara_dev *dev = (struct sahara_dev *)data; 1292 unsigned int stat = sahara_read(dev, SAHARA_REG_STATUS); 1293 unsigned int err = sahara_read(dev, SAHARA_REG_ERRSTATUS); 1294 1295 sahara_write(dev, SAHARA_CMD_CLEAR_INT | SAHARA_CMD_CLEAR_ERR, 1296 SAHARA_REG_CMD); 1297 1298 sahara_decode_status(dev, stat); 1299 1300 if (SAHARA_STATUS_GET_STATE(stat) == SAHARA_STATE_BUSY) { 1301 return IRQ_NONE; 1302 } else if (SAHARA_STATUS_GET_STATE(stat) == SAHARA_STATE_COMPLETE) { 1303 dev->error = 0; 1304 } else { 1305 sahara_decode_error(dev, err); 1306 dev->error = -EINVAL; 1307 } 1308 1309 complete(&dev->dma_completion); 1310 1311 return IRQ_HANDLED; 1312 } 1313 1314 1315 static int sahara_register_algs(struct sahara_dev *dev) 1316 { 1317 int err; 1318 unsigned int i, j, k, l; 1319 1320 for (i = 0; i < ARRAY_SIZE(aes_algs); i++) { 1321 err = crypto_register_alg(&aes_algs[i]); 1322 if (err) 1323 goto err_aes_algs; 1324 } 1325 1326 for (k = 0; k < ARRAY_SIZE(sha_v3_algs); k++) { 1327 err = crypto_register_ahash(&sha_v3_algs[k]); 1328 if (err) 1329 goto err_sha_v3_algs; 1330 } 1331 1332 if (dev->version > SAHARA_VERSION_3) 1333 for (l = 0; l < ARRAY_SIZE(sha_v4_algs); l++) { 1334 err = crypto_register_ahash(&sha_v4_algs[l]); 1335 if (err) 1336 goto err_sha_v4_algs; 1337 } 1338 1339 return 0; 1340 1341 err_sha_v4_algs: 1342 for (j = 0; j < l; j++) 1343 crypto_unregister_ahash(&sha_v4_algs[j]); 1344 1345 err_sha_v3_algs: 1346 for (j = 0; j < k; j++) 1347 crypto_unregister_ahash(&sha_v3_algs[j]); 1348 1349 err_aes_algs: 1350 for (j = 0; j < i; j++) 1351 crypto_unregister_alg(&aes_algs[j]); 1352 1353 return err; 1354 } 1355 1356 static void sahara_unregister_algs(struct sahara_dev *dev) 1357 { 1358 unsigned int i; 1359 1360 for (i = 0; i < ARRAY_SIZE(aes_algs); i++) 1361 crypto_unregister_alg(&aes_algs[i]); 1362 1363 for (i = 0; i < ARRAY_SIZE(sha_v3_algs); i++) 1364 crypto_unregister_ahash(&sha_v3_algs[i]); 1365 1366 if (dev->version > SAHARA_VERSION_3) 1367 for (i = 0; i < ARRAY_SIZE(sha_v4_algs); i++) 1368 crypto_unregister_ahash(&sha_v4_algs[i]); 1369 } 1370 1371 static const struct platform_device_id sahara_platform_ids[] = { 1372 { .name = "sahara-imx27" }, 1373 { /* sentinel */ } 1374 }; 1375 MODULE_DEVICE_TABLE(platform, sahara_platform_ids); 1376 1377 static const struct of_device_id sahara_dt_ids[] = { 1378 { .compatible = "fsl,imx53-sahara" }, 1379 { .compatible = "fsl,imx27-sahara" }, 1380 { /* sentinel */ } 1381 }; 1382 MODULE_DEVICE_TABLE(of, sahara_dt_ids); 1383 1384 static int sahara_probe(struct platform_device *pdev) 1385 { 1386 struct sahara_dev *dev; 1387 u32 version; 1388 int irq; 1389 int err; 1390 int i; 1391 1392 dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL); 1393 if (!dev) 1394 return -ENOMEM; 1395 1396 dev->device = &pdev->dev; 1397 platform_set_drvdata(pdev, dev); 1398 1399 /* Get the base address */ 1400 dev->regs_base = devm_platform_ioremap_resource(pdev, 0); 1401 if (IS_ERR(dev->regs_base)) 1402 return PTR_ERR(dev->regs_base); 1403 1404 /* Get the IRQ */ 1405 irq = platform_get_irq(pdev, 0); 1406 if (irq < 0) { 1407 dev_err(&pdev->dev, "failed to get irq resource\n"); 1408 return irq; 1409 } 1410 1411 err = devm_request_irq(&pdev->dev, irq, sahara_irq_handler, 1412 0, dev_name(&pdev->dev), dev); 1413 if (err) { 1414 dev_err(&pdev->dev, "failed to request irq\n"); 1415 return err; 1416 } 1417 1418 /* clocks */ 1419 dev->clk_ipg = devm_clk_get(&pdev->dev, "ipg"); 1420 if (IS_ERR(dev->clk_ipg)) { 1421 dev_err(&pdev->dev, "Could not get ipg clock\n"); 1422 return PTR_ERR(dev->clk_ipg); 1423 } 1424 1425 dev->clk_ahb = devm_clk_get(&pdev->dev, "ahb"); 1426 if (IS_ERR(dev->clk_ahb)) { 1427 dev_err(&pdev->dev, "Could not get ahb clock\n"); 1428 return PTR_ERR(dev->clk_ahb); 1429 } 1430 1431 /* Allocate HW descriptors */ 1432 dev->hw_desc[0] = dmam_alloc_coherent(&pdev->dev, 1433 SAHARA_MAX_HW_DESC * sizeof(struct sahara_hw_desc), 1434 &dev->hw_phys_desc[0], GFP_KERNEL); 1435 if (!dev->hw_desc[0]) { 1436 dev_err(&pdev->dev, "Could not allocate hw descriptors\n"); 1437 return -ENOMEM; 1438 } 1439 dev->hw_desc[1] = dev->hw_desc[0] + 1; 1440 dev->hw_phys_desc[1] = dev->hw_phys_desc[0] + 1441 sizeof(struct sahara_hw_desc); 1442 1443 /* Allocate space for iv and key */ 1444 dev->key_base = dmam_alloc_coherent(&pdev->dev, 2 * AES_KEYSIZE_128, 1445 &dev->key_phys_base, GFP_KERNEL); 1446 if (!dev->key_base) { 1447 dev_err(&pdev->dev, "Could not allocate memory for key\n"); 1448 return -ENOMEM; 1449 } 1450 dev->iv_base = dev->key_base + AES_KEYSIZE_128; 1451 dev->iv_phys_base = dev->key_phys_base + AES_KEYSIZE_128; 1452 1453 /* Allocate space for context: largest digest + message length field */ 1454 dev->context_base = dmam_alloc_coherent(&pdev->dev, 1455 SHA256_DIGEST_SIZE + 4, 1456 &dev->context_phys_base, GFP_KERNEL); 1457 if (!dev->context_base) { 1458 dev_err(&pdev->dev, "Could not allocate memory for MDHA context\n"); 1459 return -ENOMEM; 1460 } 1461 1462 /* Allocate space for HW links */ 1463 dev->hw_link[0] = dmam_alloc_coherent(&pdev->dev, 1464 SAHARA_MAX_HW_LINK * sizeof(struct sahara_hw_link), 1465 &dev->hw_phys_link[0], GFP_KERNEL); 1466 if (!dev->hw_link[0]) { 1467 dev_err(&pdev->dev, "Could not allocate hw links\n"); 1468 return -ENOMEM; 1469 } 1470 for (i = 1; i < SAHARA_MAX_HW_LINK; i++) { 1471 dev->hw_phys_link[i] = dev->hw_phys_link[i - 1] + 1472 sizeof(struct sahara_hw_link); 1473 dev->hw_link[i] = dev->hw_link[i - 1] + 1; 1474 } 1475 1476 crypto_init_queue(&dev->queue, SAHARA_QUEUE_LENGTH); 1477 1478 mutex_init(&dev->queue_mutex); 1479 1480 dev_ptr = dev; 1481 1482 dev->kthread = kthread_run(sahara_queue_manage, dev, "sahara_crypto"); 1483 if (IS_ERR(dev->kthread)) { 1484 return PTR_ERR(dev->kthread); 1485 } 1486 1487 init_completion(&dev->dma_completion); 1488 1489 err = clk_prepare_enable(dev->clk_ipg); 1490 if (err) 1491 return err; 1492 err = clk_prepare_enable(dev->clk_ahb); 1493 if (err) 1494 goto clk_ipg_disable; 1495 1496 version = sahara_read(dev, SAHARA_REG_VERSION); 1497 if (of_device_is_compatible(pdev->dev.of_node, "fsl,imx27-sahara")) { 1498 if (version != SAHARA_VERSION_3) 1499 err = -ENODEV; 1500 } else if (of_device_is_compatible(pdev->dev.of_node, 1501 "fsl,imx53-sahara")) { 1502 if (((version >> 8) & 0xff) != SAHARA_VERSION_4) 1503 err = -ENODEV; 1504 version = (version >> 8) & 0xff; 1505 } 1506 if (err == -ENODEV) { 1507 dev_err(&pdev->dev, "SAHARA version %d not supported\n", 1508 version); 1509 goto err_algs; 1510 } 1511 1512 dev->version = version; 1513 1514 sahara_write(dev, SAHARA_CMD_RESET | SAHARA_CMD_MODE_BATCH, 1515 SAHARA_REG_CMD); 1516 sahara_write(dev, SAHARA_CONTROL_SET_THROTTLE(0) | 1517 SAHARA_CONTROL_SET_MAXBURST(8) | 1518 SAHARA_CONTROL_RNG_AUTORSD | 1519 SAHARA_CONTROL_ENABLE_INT, 1520 SAHARA_REG_CONTROL); 1521 1522 err = sahara_register_algs(dev); 1523 if (err) 1524 goto err_algs; 1525 1526 dev_info(&pdev->dev, "SAHARA version %d initialized\n", version); 1527 1528 return 0; 1529 1530 err_algs: 1531 kthread_stop(dev->kthread); 1532 dev_ptr = NULL; 1533 clk_disable_unprepare(dev->clk_ahb); 1534 clk_ipg_disable: 1535 clk_disable_unprepare(dev->clk_ipg); 1536 1537 return err; 1538 } 1539 1540 static int sahara_remove(struct platform_device *pdev) 1541 { 1542 struct sahara_dev *dev = platform_get_drvdata(pdev); 1543 1544 kthread_stop(dev->kthread); 1545 1546 sahara_unregister_algs(dev); 1547 1548 clk_disable_unprepare(dev->clk_ipg); 1549 clk_disable_unprepare(dev->clk_ahb); 1550 1551 dev_ptr = NULL; 1552 1553 return 0; 1554 } 1555 1556 static struct platform_driver sahara_driver = { 1557 .probe = sahara_probe, 1558 .remove = sahara_remove, 1559 .driver = { 1560 .name = SAHARA_NAME, 1561 .of_match_table = sahara_dt_ids, 1562 }, 1563 .id_table = sahara_platform_ids, 1564 }; 1565 1566 module_platform_driver(sahara_driver); 1567 1568 MODULE_LICENSE("GPL"); 1569 MODULE_AUTHOR("Javier Martin <javier.martin@vista-silicon.com>"); 1570 MODULE_AUTHOR("Steffen Trumtrar <s.trumtrar@pengutronix.de>"); 1571 MODULE_DESCRIPTION("SAHARA2 HW crypto accelerator"); 1572