1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /** 3 * AMCC SoC PPC4xx Crypto Driver 4 * 5 * Copyright (c) 2008 Applied Micro Circuits Corporation. 6 * All rights reserved. James Hsiao <jhsiao@amcc.com> 7 * 8 * This file implements AMCC crypto offload Linux device driver for use with 9 * Linux CryptoAPI. 10 */ 11 12 #include <linux/kernel.h> 13 #include <linux/interrupt.h> 14 #include <linux/spinlock_types.h> 15 #include <linux/random.h> 16 #include <linux/scatterlist.h> 17 #include <linux/crypto.h> 18 #include <linux/dma-mapping.h> 19 #include <linux/platform_device.h> 20 #include <linux/init.h> 21 #include <linux/module.h> 22 #include <linux/of_address.h> 23 #include <linux/of_irq.h> 24 #include <linux/of_platform.h> 25 #include <linux/slab.h> 26 #include <asm/dcr.h> 27 #include <asm/dcr-regs.h> 28 #include <asm/cacheflush.h> 29 #include <crypto/aead.h> 30 #include <crypto/aes.h> 31 #include <crypto/ctr.h> 32 #include <crypto/gcm.h> 33 #include <crypto/sha.h> 34 #include <crypto/rng.h> 35 #include <crypto/scatterwalk.h> 36 #include <crypto/skcipher.h> 37 #include <crypto/internal/aead.h> 38 #include <crypto/internal/rng.h> 39 #include <crypto/internal/skcipher.h> 40 #include "crypto4xx_reg_def.h" 41 #include "crypto4xx_core.h" 42 #include "crypto4xx_sa.h" 43 #include "crypto4xx_trng.h" 44 45 #define PPC4XX_SEC_VERSION_STR "0.5" 46 47 /** 48 * PPC4xx Crypto Engine Initialization Routine 49 */ 50 static void crypto4xx_hw_init(struct crypto4xx_device *dev) 51 { 52 union ce_ring_size ring_size; 53 union ce_ring_control ring_ctrl; 54 union ce_part_ring_size part_ring_size; 55 union ce_io_threshold io_threshold; 56 u32 rand_num; 57 union ce_pe_dma_cfg pe_dma_cfg; 58 u32 device_ctrl; 59 60 writel(PPC4XX_BYTE_ORDER, dev->ce_base + CRYPTO4XX_BYTE_ORDER_CFG); 61 /* setup pe dma, include reset sg, pdr and pe, then release reset */ 62 pe_dma_cfg.w = 0; 63 pe_dma_cfg.bf.bo_sgpd_en = 1; 64 pe_dma_cfg.bf.bo_data_en = 0; 65 pe_dma_cfg.bf.bo_sa_en = 1; 66 pe_dma_cfg.bf.bo_pd_en = 1; 67 pe_dma_cfg.bf.dynamic_sa_en = 1; 68 pe_dma_cfg.bf.reset_sg = 1; 69 pe_dma_cfg.bf.reset_pdr = 1; 70 pe_dma_cfg.bf.reset_pe = 1; 71 writel(pe_dma_cfg.w, dev->ce_base + CRYPTO4XX_PE_DMA_CFG); 72 /* un reset pe,sg and pdr */ 73 pe_dma_cfg.bf.pe_mode = 0; 74 pe_dma_cfg.bf.reset_sg = 0; 75 pe_dma_cfg.bf.reset_pdr = 0; 76 pe_dma_cfg.bf.reset_pe = 0; 77 pe_dma_cfg.bf.bo_td_en = 0; 78 writel(pe_dma_cfg.w, dev->ce_base + CRYPTO4XX_PE_DMA_CFG); 79 writel(dev->pdr_pa, dev->ce_base + CRYPTO4XX_PDR_BASE); 80 writel(dev->pdr_pa, dev->ce_base + CRYPTO4XX_RDR_BASE); 81 writel(PPC4XX_PRNG_CTRL_AUTO_EN, dev->ce_base + CRYPTO4XX_PRNG_CTRL); 82 get_random_bytes(&rand_num, sizeof(rand_num)); 83 writel(rand_num, dev->ce_base + CRYPTO4XX_PRNG_SEED_L); 84 get_random_bytes(&rand_num, sizeof(rand_num)); 85 writel(rand_num, dev->ce_base + CRYPTO4XX_PRNG_SEED_H); 86 ring_size.w = 0; 87 ring_size.bf.ring_offset = PPC4XX_PD_SIZE; 88 ring_size.bf.ring_size = PPC4XX_NUM_PD; 89 writel(ring_size.w, dev->ce_base + CRYPTO4XX_RING_SIZE); 90 ring_ctrl.w = 0; 91 writel(ring_ctrl.w, dev->ce_base + CRYPTO4XX_RING_CTRL); 92 device_ctrl = readl(dev->ce_base + CRYPTO4XX_DEVICE_CTRL); 93 device_ctrl |= PPC4XX_DC_3DES_EN; 94 writel(device_ctrl, dev->ce_base + CRYPTO4XX_DEVICE_CTRL); 95 writel(dev->gdr_pa, dev->ce_base + CRYPTO4XX_GATH_RING_BASE); 96 writel(dev->sdr_pa, dev->ce_base + CRYPTO4XX_SCAT_RING_BASE); 97 part_ring_size.w = 0; 98 part_ring_size.bf.sdr_size = PPC4XX_SDR_SIZE; 99 part_ring_size.bf.gdr_size = PPC4XX_GDR_SIZE; 100 writel(part_ring_size.w, dev->ce_base + CRYPTO4XX_PART_RING_SIZE); 101 writel(PPC4XX_SD_BUFFER_SIZE, dev->ce_base + CRYPTO4XX_PART_RING_CFG); 102 io_threshold.w = 0; 103 io_threshold.bf.output_threshold = PPC4XX_OUTPUT_THRESHOLD; 104 io_threshold.bf.input_threshold = PPC4XX_INPUT_THRESHOLD; 105 writel(io_threshold.w, dev->ce_base + CRYPTO4XX_IO_THRESHOLD); 106 writel(0, dev->ce_base + CRYPTO4XX_PDR_BASE_UADDR); 107 writel(0, dev->ce_base + CRYPTO4XX_RDR_BASE_UADDR); 108 writel(0, dev->ce_base + CRYPTO4XX_PKT_SRC_UADDR); 109 writel(0, dev->ce_base + CRYPTO4XX_PKT_DEST_UADDR); 110 writel(0, dev->ce_base + CRYPTO4XX_SA_UADDR); 111 writel(0, dev->ce_base + CRYPTO4XX_GATH_RING_BASE_UADDR); 112 writel(0, dev->ce_base + CRYPTO4XX_SCAT_RING_BASE_UADDR); 113 /* un reset pe,sg and pdr */ 114 pe_dma_cfg.bf.pe_mode = 1; 115 pe_dma_cfg.bf.reset_sg = 0; 116 pe_dma_cfg.bf.reset_pdr = 0; 117 pe_dma_cfg.bf.reset_pe = 0; 118 pe_dma_cfg.bf.bo_td_en = 0; 119 writel(pe_dma_cfg.w, dev->ce_base + CRYPTO4XX_PE_DMA_CFG); 120 /*clear all pending interrupt*/ 121 writel(PPC4XX_INTERRUPT_CLR, dev->ce_base + CRYPTO4XX_INT_CLR); 122 writel(PPC4XX_INT_DESCR_CNT, dev->ce_base + CRYPTO4XX_INT_DESCR_CNT); 123 writel(PPC4XX_INT_DESCR_CNT, dev->ce_base + CRYPTO4XX_INT_DESCR_CNT); 124 writel(PPC4XX_INT_CFG, dev->ce_base + CRYPTO4XX_INT_CFG); 125 if (dev->is_revb) { 126 writel(PPC4XX_INT_TIMEOUT_CNT_REVB << 10, 127 dev->ce_base + CRYPTO4XX_INT_TIMEOUT_CNT); 128 writel(PPC4XX_PD_DONE_INT | PPC4XX_TMO_ERR_INT, 129 dev->ce_base + CRYPTO4XX_INT_EN); 130 } else { 131 writel(PPC4XX_PD_DONE_INT, dev->ce_base + CRYPTO4XX_INT_EN); 132 } 133 } 134 135 int crypto4xx_alloc_sa(struct crypto4xx_ctx *ctx, u32 size) 136 { 137 ctx->sa_in = kcalloc(size, 4, GFP_ATOMIC); 138 if (ctx->sa_in == NULL) 139 return -ENOMEM; 140 141 ctx->sa_out = kcalloc(size, 4, GFP_ATOMIC); 142 if (ctx->sa_out == NULL) { 143 kfree(ctx->sa_in); 144 ctx->sa_in = NULL; 145 return -ENOMEM; 146 } 147 148 ctx->sa_len = size; 149 150 return 0; 151 } 152 153 void crypto4xx_free_sa(struct crypto4xx_ctx *ctx) 154 { 155 kfree(ctx->sa_in); 156 ctx->sa_in = NULL; 157 kfree(ctx->sa_out); 158 ctx->sa_out = NULL; 159 ctx->sa_len = 0; 160 } 161 162 /** 163 * alloc memory for the gather ring 164 * no need to alloc buf for the ring 165 * gdr_tail, gdr_head and gdr_count are initialized by this function 166 */ 167 static u32 crypto4xx_build_pdr(struct crypto4xx_device *dev) 168 { 169 int i; 170 dev->pdr = dma_alloc_coherent(dev->core_dev->device, 171 sizeof(struct ce_pd) * PPC4XX_NUM_PD, 172 &dev->pdr_pa, GFP_KERNEL); 173 if (!dev->pdr) 174 return -ENOMEM; 175 176 dev->pdr_uinfo = kcalloc(PPC4XX_NUM_PD, sizeof(struct pd_uinfo), 177 GFP_KERNEL); 178 if (!dev->pdr_uinfo) { 179 dma_free_coherent(dev->core_dev->device, 180 sizeof(struct ce_pd) * PPC4XX_NUM_PD, 181 dev->pdr, 182 dev->pdr_pa); 183 return -ENOMEM; 184 } 185 dev->shadow_sa_pool = dma_alloc_coherent(dev->core_dev->device, 186 sizeof(union shadow_sa_buf) * PPC4XX_NUM_PD, 187 &dev->shadow_sa_pool_pa, 188 GFP_KERNEL); 189 if (!dev->shadow_sa_pool) 190 return -ENOMEM; 191 192 dev->shadow_sr_pool = dma_alloc_coherent(dev->core_dev->device, 193 sizeof(struct sa_state_record) * PPC4XX_NUM_PD, 194 &dev->shadow_sr_pool_pa, GFP_KERNEL); 195 if (!dev->shadow_sr_pool) 196 return -ENOMEM; 197 for (i = 0; i < PPC4XX_NUM_PD; i++) { 198 struct ce_pd *pd = &dev->pdr[i]; 199 struct pd_uinfo *pd_uinfo = &dev->pdr_uinfo[i]; 200 201 pd->sa = dev->shadow_sa_pool_pa + 202 sizeof(union shadow_sa_buf) * i; 203 204 /* alloc 256 bytes which is enough for any kind of dynamic sa */ 205 pd_uinfo->sa_va = &dev->shadow_sa_pool[i].sa; 206 207 /* alloc state record */ 208 pd_uinfo->sr_va = &dev->shadow_sr_pool[i]; 209 pd_uinfo->sr_pa = dev->shadow_sr_pool_pa + 210 sizeof(struct sa_state_record) * i; 211 } 212 213 return 0; 214 } 215 216 static void crypto4xx_destroy_pdr(struct crypto4xx_device *dev) 217 { 218 if (dev->pdr) 219 dma_free_coherent(dev->core_dev->device, 220 sizeof(struct ce_pd) * PPC4XX_NUM_PD, 221 dev->pdr, dev->pdr_pa); 222 223 if (dev->shadow_sa_pool) 224 dma_free_coherent(dev->core_dev->device, 225 sizeof(union shadow_sa_buf) * PPC4XX_NUM_PD, 226 dev->shadow_sa_pool, dev->shadow_sa_pool_pa); 227 228 if (dev->shadow_sr_pool) 229 dma_free_coherent(dev->core_dev->device, 230 sizeof(struct sa_state_record) * PPC4XX_NUM_PD, 231 dev->shadow_sr_pool, dev->shadow_sr_pool_pa); 232 233 kfree(dev->pdr_uinfo); 234 } 235 236 static u32 crypto4xx_get_pd_from_pdr_nolock(struct crypto4xx_device *dev) 237 { 238 u32 retval; 239 u32 tmp; 240 241 retval = dev->pdr_head; 242 tmp = (dev->pdr_head + 1) % PPC4XX_NUM_PD; 243 244 if (tmp == dev->pdr_tail) 245 return ERING_WAS_FULL; 246 247 dev->pdr_head = tmp; 248 249 return retval; 250 } 251 252 static u32 crypto4xx_put_pd_to_pdr(struct crypto4xx_device *dev, u32 idx) 253 { 254 struct pd_uinfo *pd_uinfo = &dev->pdr_uinfo[idx]; 255 u32 tail; 256 unsigned long flags; 257 258 spin_lock_irqsave(&dev->core_dev->lock, flags); 259 pd_uinfo->state = PD_ENTRY_FREE; 260 261 if (dev->pdr_tail != PPC4XX_LAST_PD) 262 dev->pdr_tail++; 263 else 264 dev->pdr_tail = 0; 265 tail = dev->pdr_tail; 266 spin_unlock_irqrestore(&dev->core_dev->lock, flags); 267 268 return tail; 269 } 270 271 /** 272 * alloc memory for the gather ring 273 * no need to alloc buf for the ring 274 * gdr_tail, gdr_head and gdr_count are initialized by this function 275 */ 276 static u32 crypto4xx_build_gdr(struct crypto4xx_device *dev) 277 { 278 dev->gdr = dma_alloc_coherent(dev->core_dev->device, 279 sizeof(struct ce_gd) * PPC4XX_NUM_GD, 280 &dev->gdr_pa, GFP_KERNEL); 281 if (!dev->gdr) 282 return -ENOMEM; 283 284 return 0; 285 } 286 287 static inline void crypto4xx_destroy_gdr(struct crypto4xx_device *dev) 288 { 289 if (dev->gdr) 290 dma_free_coherent(dev->core_dev->device, 291 sizeof(struct ce_gd) * PPC4XX_NUM_GD, 292 dev->gdr, dev->gdr_pa); 293 } 294 295 /* 296 * when this function is called. 297 * preemption or interrupt must be disabled 298 */ 299 static u32 crypto4xx_get_n_gd(struct crypto4xx_device *dev, int n) 300 { 301 u32 retval; 302 u32 tmp; 303 304 if (n >= PPC4XX_NUM_GD) 305 return ERING_WAS_FULL; 306 307 retval = dev->gdr_head; 308 tmp = (dev->gdr_head + n) % PPC4XX_NUM_GD; 309 if (dev->gdr_head > dev->gdr_tail) { 310 if (tmp < dev->gdr_head && tmp >= dev->gdr_tail) 311 return ERING_WAS_FULL; 312 } else if (dev->gdr_head < dev->gdr_tail) { 313 if (tmp < dev->gdr_head || tmp >= dev->gdr_tail) 314 return ERING_WAS_FULL; 315 } 316 dev->gdr_head = tmp; 317 318 return retval; 319 } 320 321 static u32 crypto4xx_put_gd_to_gdr(struct crypto4xx_device *dev) 322 { 323 unsigned long flags; 324 325 spin_lock_irqsave(&dev->core_dev->lock, flags); 326 if (dev->gdr_tail == dev->gdr_head) { 327 spin_unlock_irqrestore(&dev->core_dev->lock, flags); 328 return 0; 329 } 330 331 if (dev->gdr_tail != PPC4XX_LAST_GD) 332 dev->gdr_tail++; 333 else 334 dev->gdr_tail = 0; 335 336 spin_unlock_irqrestore(&dev->core_dev->lock, flags); 337 338 return 0; 339 } 340 341 static inline struct ce_gd *crypto4xx_get_gdp(struct crypto4xx_device *dev, 342 dma_addr_t *gd_dma, u32 idx) 343 { 344 *gd_dma = dev->gdr_pa + sizeof(struct ce_gd) * idx; 345 346 return &dev->gdr[idx]; 347 } 348 349 /** 350 * alloc memory for the scatter ring 351 * need to alloc buf for the ring 352 * sdr_tail, sdr_head and sdr_count are initialized by this function 353 */ 354 static u32 crypto4xx_build_sdr(struct crypto4xx_device *dev) 355 { 356 int i; 357 358 dev->scatter_buffer_va = 359 dma_alloc_coherent(dev->core_dev->device, 360 PPC4XX_SD_BUFFER_SIZE * PPC4XX_NUM_SD, 361 &dev->scatter_buffer_pa, GFP_KERNEL); 362 if (!dev->scatter_buffer_va) 363 return -ENOMEM; 364 365 /* alloc memory for scatter descriptor ring */ 366 dev->sdr = dma_alloc_coherent(dev->core_dev->device, 367 sizeof(struct ce_sd) * PPC4XX_NUM_SD, 368 &dev->sdr_pa, GFP_KERNEL); 369 if (!dev->sdr) 370 return -ENOMEM; 371 372 for (i = 0; i < PPC4XX_NUM_SD; i++) { 373 dev->sdr[i].ptr = dev->scatter_buffer_pa + 374 PPC4XX_SD_BUFFER_SIZE * i; 375 } 376 377 return 0; 378 } 379 380 static void crypto4xx_destroy_sdr(struct crypto4xx_device *dev) 381 { 382 if (dev->sdr) 383 dma_free_coherent(dev->core_dev->device, 384 sizeof(struct ce_sd) * PPC4XX_NUM_SD, 385 dev->sdr, dev->sdr_pa); 386 387 if (dev->scatter_buffer_va) 388 dma_free_coherent(dev->core_dev->device, 389 PPC4XX_SD_BUFFER_SIZE * PPC4XX_NUM_SD, 390 dev->scatter_buffer_va, 391 dev->scatter_buffer_pa); 392 } 393 394 /* 395 * when this function is called. 396 * preemption or interrupt must be disabled 397 */ 398 static u32 crypto4xx_get_n_sd(struct crypto4xx_device *dev, int n) 399 { 400 u32 retval; 401 u32 tmp; 402 403 if (n >= PPC4XX_NUM_SD) 404 return ERING_WAS_FULL; 405 406 retval = dev->sdr_head; 407 tmp = (dev->sdr_head + n) % PPC4XX_NUM_SD; 408 if (dev->sdr_head > dev->gdr_tail) { 409 if (tmp < dev->sdr_head && tmp >= dev->sdr_tail) 410 return ERING_WAS_FULL; 411 } else if (dev->sdr_head < dev->sdr_tail) { 412 if (tmp < dev->sdr_head || tmp >= dev->sdr_tail) 413 return ERING_WAS_FULL; 414 } /* the head = tail, or empty case is already take cared */ 415 dev->sdr_head = tmp; 416 417 return retval; 418 } 419 420 static u32 crypto4xx_put_sd_to_sdr(struct crypto4xx_device *dev) 421 { 422 unsigned long flags; 423 424 spin_lock_irqsave(&dev->core_dev->lock, flags); 425 if (dev->sdr_tail == dev->sdr_head) { 426 spin_unlock_irqrestore(&dev->core_dev->lock, flags); 427 return 0; 428 } 429 if (dev->sdr_tail != PPC4XX_LAST_SD) 430 dev->sdr_tail++; 431 else 432 dev->sdr_tail = 0; 433 spin_unlock_irqrestore(&dev->core_dev->lock, flags); 434 435 return 0; 436 } 437 438 static inline struct ce_sd *crypto4xx_get_sdp(struct crypto4xx_device *dev, 439 dma_addr_t *sd_dma, u32 idx) 440 { 441 *sd_dma = dev->sdr_pa + sizeof(struct ce_sd) * idx; 442 443 return &dev->sdr[idx]; 444 } 445 446 static void crypto4xx_copy_pkt_to_dst(struct crypto4xx_device *dev, 447 struct ce_pd *pd, 448 struct pd_uinfo *pd_uinfo, 449 u32 nbytes, 450 struct scatterlist *dst) 451 { 452 unsigned int first_sd = pd_uinfo->first_sd; 453 unsigned int last_sd; 454 unsigned int overflow = 0; 455 unsigned int to_copy; 456 unsigned int dst_start = 0; 457 458 /* 459 * Because the scatter buffers are all neatly organized in one 460 * big continuous ringbuffer; scatterwalk_map_and_copy() can 461 * be instructed to copy a range of buffers in one go. 462 */ 463 464 last_sd = (first_sd + pd_uinfo->num_sd); 465 if (last_sd > PPC4XX_LAST_SD) { 466 last_sd = PPC4XX_LAST_SD; 467 overflow = last_sd % PPC4XX_NUM_SD; 468 } 469 470 while (nbytes) { 471 void *buf = dev->scatter_buffer_va + 472 first_sd * PPC4XX_SD_BUFFER_SIZE; 473 474 to_copy = min(nbytes, PPC4XX_SD_BUFFER_SIZE * 475 (1 + last_sd - first_sd)); 476 scatterwalk_map_and_copy(buf, dst, dst_start, to_copy, 1); 477 nbytes -= to_copy; 478 479 if (overflow) { 480 first_sd = 0; 481 last_sd = overflow; 482 dst_start += to_copy; 483 overflow = 0; 484 } 485 } 486 } 487 488 static void crypto4xx_copy_digest_to_dst(void *dst, 489 struct pd_uinfo *pd_uinfo, 490 struct crypto4xx_ctx *ctx) 491 { 492 struct dynamic_sa_ctl *sa = (struct dynamic_sa_ctl *) ctx->sa_in; 493 494 if (sa->sa_command_0.bf.hash_alg == SA_HASH_ALG_SHA1) { 495 memcpy(dst, pd_uinfo->sr_va->save_digest, 496 SA_HASH_ALG_SHA1_DIGEST_SIZE); 497 } 498 } 499 500 static void crypto4xx_ret_sg_desc(struct crypto4xx_device *dev, 501 struct pd_uinfo *pd_uinfo) 502 { 503 int i; 504 if (pd_uinfo->num_gd) { 505 for (i = 0; i < pd_uinfo->num_gd; i++) 506 crypto4xx_put_gd_to_gdr(dev); 507 pd_uinfo->first_gd = 0xffffffff; 508 pd_uinfo->num_gd = 0; 509 } 510 if (pd_uinfo->num_sd) { 511 for (i = 0; i < pd_uinfo->num_sd; i++) 512 crypto4xx_put_sd_to_sdr(dev); 513 514 pd_uinfo->first_sd = 0xffffffff; 515 pd_uinfo->num_sd = 0; 516 } 517 } 518 519 static void crypto4xx_cipher_done(struct crypto4xx_device *dev, 520 struct pd_uinfo *pd_uinfo, 521 struct ce_pd *pd) 522 { 523 struct skcipher_request *req; 524 struct scatterlist *dst; 525 dma_addr_t addr; 526 527 req = skcipher_request_cast(pd_uinfo->async_req); 528 529 if (pd_uinfo->sa_va->sa_command_0.bf.scatter) { 530 crypto4xx_copy_pkt_to_dst(dev, pd, pd_uinfo, 531 req->cryptlen, req->dst); 532 } else { 533 dst = pd_uinfo->dest_va; 534 addr = dma_map_page(dev->core_dev->device, sg_page(dst), 535 dst->offset, dst->length, DMA_FROM_DEVICE); 536 } 537 538 if (pd_uinfo->sa_va->sa_command_0.bf.save_iv == SA_SAVE_IV) { 539 struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req); 540 541 crypto4xx_memcpy_from_le32((u32 *)req->iv, 542 pd_uinfo->sr_va->save_iv, 543 crypto_skcipher_ivsize(skcipher)); 544 } 545 546 crypto4xx_ret_sg_desc(dev, pd_uinfo); 547 548 if (pd_uinfo->state & PD_ENTRY_BUSY) 549 skcipher_request_complete(req, -EINPROGRESS); 550 skcipher_request_complete(req, 0); 551 } 552 553 static void crypto4xx_ahash_done(struct crypto4xx_device *dev, 554 struct pd_uinfo *pd_uinfo) 555 { 556 struct crypto4xx_ctx *ctx; 557 struct ahash_request *ahash_req; 558 559 ahash_req = ahash_request_cast(pd_uinfo->async_req); 560 ctx = crypto_tfm_ctx(ahash_req->base.tfm); 561 562 crypto4xx_copy_digest_to_dst(ahash_req->result, pd_uinfo, 563 crypto_tfm_ctx(ahash_req->base.tfm)); 564 crypto4xx_ret_sg_desc(dev, pd_uinfo); 565 566 if (pd_uinfo->state & PD_ENTRY_BUSY) 567 ahash_request_complete(ahash_req, -EINPROGRESS); 568 ahash_request_complete(ahash_req, 0); 569 } 570 571 static void crypto4xx_aead_done(struct crypto4xx_device *dev, 572 struct pd_uinfo *pd_uinfo, 573 struct ce_pd *pd) 574 { 575 struct aead_request *aead_req = container_of(pd_uinfo->async_req, 576 struct aead_request, base); 577 struct scatterlist *dst = pd_uinfo->dest_va; 578 size_t cp_len = crypto_aead_authsize( 579 crypto_aead_reqtfm(aead_req)); 580 u32 icv[AES_BLOCK_SIZE]; 581 int err = 0; 582 583 if (pd_uinfo->sa_va->sa_command_0.bf.scatter) { 584 crypto4xx_copy_pkt_to_dst(dev, pd, pd_uinfo, 585 pd->pd_ctl_len.bf.pkt_len, 586 dst); 587 } else { 588 dma_unmap_page(dev->core_dev->device, pd->dest, dst->length, 589 DMA_FROM_DEVICE); 590 } 591 592 if (pd_uinfo->sa_va->sa_command_0.bf.dir == DIR_OUTBOUND) { 593 /* append icv at the end */ 594 crypto4xx_memcpy_from_le32(icv, pd_uinfo->sr_va->save_digest, 595 sizeof(icv)); 596 597 scatterwalk_map_and_copy(icv, dst, aead_req->cryptlen, 598 cp_len, 1); 599 } else { 600 /* check icv at the end */ 601 scatterwalk_map_and_copy(icv, aead_req->src, 602 aead_req->assoclen + aead_req->cryptlen - 603 cp_len, cp_len, 0); 604 605 crypto4xx_memcpy_from_le32(icv, icv, sizeof(icv)); 606 607 if (crypto_memneq(icv, pd_uinfo->sr_va->save_digest, cp_len)) 608 err = -EBADMSG; 609 } 610 611 crypto4xx_ret_sg_desc(dev, pd_uinfo); 612 613 if (pd->pd_ctl.bf.status & 0xff) { 614 if (!__ratelimit(&dev->aead_ratelimit)) { 615 if (pd->pd_ctl.bf.status & 2) 616 pr_err("pad fail error\n"); 617 if (pd->pd_ctl.bf.status & 4) 618 pr_err("seqnum fail\n"); 619 if (pd->pd_ctl.bf.status & 8) 620 pr_err("error _notify\n"); 621 pr_err("aead return err status = 0x%02x\n", 622 pd->pd_ctl.bf.status & 0xff); 623 pr_err("pd pad_ctl = 0x%08x\n", 624 pd->pd_ctl.bf.pd_pad_ctl); 625 } 626 err = -EINVAL; 627 } 628 629 if (pd_uinfo->state & PD_ENTRY_BUSY) 630 aead_request_complete(aead_req, -EINPROGRESS); 631 632 aead_request_complete(aead_req, err); 633 } 634 635 static void crypto4xx_pd_done(struct crypto4xx_device *dev, u32 idx) 636 { 637 struct ce_pd *pd = &dev->pdr[idx]; 638 struct pd_uinfo *pd_uinfo = &dev->pdr_uinfo[idx]; 639 640 switch (crypto_tfm_alg_type(pd_uinfo->async_req->tfm)) { 641 case CRYPTO_ALG_TYPE_SKCIPHER: 642 crypto4xx_cipher_done(dev, pd_uinfo, pd); 643 break; 644 case CRYPTO_ALG_TYPE_AEAD: 645 crypto4xx_aead_done(dev, pd_uinfo, pd); 646 break; 647 case CRYPTO_ALG_TYPE_AHASH: 648 crypto4xx_ahash_done(dev, pd_uinfo); 649 break; 650 } 651 } 652 653 static void crypto4xx_stop_all(struct crypto4xx_core_device *core_dev) 654 { 655 crypto4xx_destroy_pdr(core_dev->dev); 656 crypto4xx_destroy_gdr(core_dev->dev); 657 crypto4xx_destroy_sdr(core_dev->dev); 658 iounmap(core_dev->dev->ce_base); 659 kfree(core_dev->dev); 660 kfree(core_dev); 661 } 662 663 static u32 get_next_gd(u32 current) 664 { 665 if (current != PPC4XX_LAST_GD) 666 return current + 1; 667 else 668 return 0; 669 } 670 671 static u32 get_next_sd(u32 current) 672 { 673 if (current != PPC4XX_LAST_SD) 674 return current + 1; 675 else 676 return 0; 677 } 678 679 int crypto4xx_build_pd(struct crypto_async_request *req, 680 struct crypto4xx_ctx *ctx, 681 struct scatterlist *src, 682 struct scatterlist *dst, 683 const unsigned int datalen, 684 const __le32 *iv, const u32 iv_len, 685 const struct dynamic_sa_ctl *req_sa, 686 const unsigned int sa_len, 687 const unsigned int assoclen, 688 struct scatterlist *_dst) 689 { 690 struct crypto4xx_device *dev = ctx->dev; 691 struct dynamic_sa_ctl *sa; 692 struct ce_gd *gd; 693 struct ce_pd *pd; 694 u32 num_gd, num_sd; 695 u32 fst_gd = 0xffffffff; 696 u32 fst_sd = 0xffffffff; 697 u32 pd_entry; 698 unsigned long flags; 699 struct pd_uinfo *pd_uinfo; 700 unsigned int nbytes = datalen; 701 size_t offset_to_sr_ptr; 702 u32 gd_idx = 0; 703 int tmp; 704 bool is_busy, force_sd; 705 706 /* 707 * There's a very subtile/disguised "bug" in the hardware that 708 * gets indirectly mentioned in 18.1.3.5 Encryption/Decryption 709 * of the hardware spec: 710 * *drum roll* the AES/(T)DES OFB and CFB modes are listed as 711 * operation modes for >>> "Block ciphers" <<<. 712 * 713 * To workaround this issue and stop the hardware from causing 714 * "overran dst buffer" on crypttexts that are not a multiple 715 * of 16 (AES_BLOCK_SIZE), we force the driver to use the 716 * scatter buffers. 717 */ 718 force_sd = (req_sa->sa_command_1.bf.crypto_mode9_8 == CRYPTO_MODE_CFB 719 || req_sa->sa_command_1.bf.crypto_mode9_8 == CRYPTO_MODE_OFB) 720 && (datalen % AES_BLOCK_SIZE); 721 722 /* figure how many gd are needed */ 723 tmp = sg_nents_for_len(src, assoclen + datalen); 724 if (tmp < 0) { 725 dev_err(dev->core_dev->device, "Invalid number of src SG.\n"); 726 return tmp; 727 } 728 if (tmp == 1) 729 tmp = 0; 730 num_gd = tmp; 731 732 if (assoclen) { 733 nbytes += assoclen; 734 dst = scatterwalk_ffwd(_dst, dst, assoclen); 735 } 736 737 /* figure how many sd are needed */ 738 if (sg_is_last(dst) && force_sd == false) { 739 num_sd = 0; 740 } else { 741 if (datalen > PPC4XX_SD_BUFFER_SIZE) { 742 num_sd = datalen / PPC4XX_SD_BUFFER_SIZE; 743 if (datalen % PPC4XX_SD_BUFFER_SIZE) 744 num_sd++; 745 } else { 746 num_sd = 1; 747 } 748 } 749 750 /* 751 * The follow section of code needs to be protected 752 * The gather ring and scatter ring needs to be consecutive 753 * In case of run out of any kind of descriptor, the descriptor 754 * already got must be return the original place. 755 */ 756 spin_lock_irqsave(&dev->core_dev->lock, flags); 757 /* 758 * Let the caller know to slow down, once more than 13/16ths = 81% 759 * of the available data contexts are being used simultaneously. 760 * 761 * With PPC4XX_NUM_PD = 256, this will leave a "backlog queue" for 762 * 31 more contexts. Before new requests have to be rejected. 763 */ 764 if (req->flags & CRYPTO_TFM_REQ_MAY_BACKLOG) { 765 is_busy = ((dev->pdr_head - dev->pdr_tail) % PPC4XX_NUM_PD) >= 766 ((PPC4XX_NUM_PD * 13) / 16); 767 } else { 768 /* 769 * To fix contention issues between ipsec (no blacklog) and 770 * dm-crypto (backlog) reserve 32 entries for "no backlog" 771 * data contexts. 772 */ 773 is_busy = ((dev->pdr_head - dev->pdr_tail) % PPC4XX_NUM_PD) >= 774 ((PPC4XX_NUM_PD * 15) / 16); 775 776 if (is_busy) { 777 spin_unlock_irqrestore(&dev->core_dev->lock, flags); 778 return -EBUSY; 779 } 780 } 781 782 if (num_gd) { 783 fst_gd = crypto4xx_get_n_gd(dev, num_gd); 784 if (fst_gd == ERING_WAS_FULL) { 785 spin_unlock_irqrestore(&dev->core_dev->lock, flags); 786 return -EAGAIN; 787 } 788 } 789 if (num_sd) { 790 fst_sd = crypto4xx_get_n_sd(dev, num_sd); 791 if (fst_sd == ERING_WAS_FULL) { 792 if (num_gd) 793 dev->gdr_head = fst_gd; 794 spin_unlock_irqrestore(&dev->core_dev->lock, flags); 795 return -EAGAIN; 796 } 797 } 798 pd_entry = crypto4xx_get_pd_from_pdr_nolock(dev); 799 if (pd_entry == ERING_WAS_FULL) { 800 if (num_gd) 801 dev->gdr_head = fst_gd; 802 if (num_sd) 803 dev->sdr_head = fst_sd; 804 spin_unlock_irqrestore(&dev->core_dev->lock, flags); 805 return -EAGAIN; 806 } 807 spin_unlock_irqrestore(&dev->core_dev->lock, flags); 808 809 pd = &dev->pdr[pd_entry]; 810 pd->sa_len = sa_len; 811 812 pd_uinfo = &dev->pdr_uinfo[pd_entry]; 813 pd_uinfo->num_gd = num_gd; 814 pd_uinfo->num_sd = num_sd; 815 pd_uinfo->dest_va = dst; 816 pd_uinfo->async_req = req; 817 818 if (iv_len) 819 memcpy(pd_uinfo->sr_va->save_iv, iv, iv_len); 820 821 sa = pd_uinfo->sa_va; 822 memcpy(sa, req_sa, sa_len * 4); 823 824 sa->sa_command_1.bf.hash_crypto_offset = (assoclen >> 2); 825 offset_to_sr_ptr = get_dynamic_sa_offset_state_ptr_field(sa); 826 *(u32 *)((unsigned long)sa + offset_to_sr_ptr) = pd_uinfo->sr_pa; 827 828 if (num_gd) { 829 dma_addr_t gd_dma; 830 struct scatterlist *sg; 831 832 /* get first gd we are going to use */ 833 gd_idx = fst_gd; 834 pd_uinfo->first_gd = fst_gd; 835 gd = crypto4xx_get_gdp(dev, &gd_dma, gd_idx); 836 pd->src = gd_dma; 837 /* enable gather */ 838 sa->sa_command_0.bf.gather = 1; 839 /* walk the sg, and setup gather array */ 840 841 sg = src; 842 while (nbytes) { 843 size_t len; 844 845 len = min(sg->length, nbytes); 846 gd->ptr = dma_map_page(dev->core_dev->device, 847 sg_page(sg), sg->offset, len, DMA_TO_DEVICE); 848 gd->ctl_len.len = len; 849 gd->ctl_len.done = 0; 850 gd->ctl_len.ready = 1; 851 if (len >= nbytes) 852 break; 853 854 nbytes -= sg->length; 855 gd_idx = get_next_gd(gd_idx); 856 gd = crypto4xx_get_gdp(dev, &gd_dma, gd_idx); 857 sg = sg_next(sg); 858 } 859 } else { 860 pd->src = (u32)dma_map_page(dev->core_dev->device, sg_page(src), 861 src->offset, min(nbytes, src->length), 862 DMA_TO_DEVICE); 863 /* 864 * Disable gather in sa command 865 */ 866 sa->sa_command_0.bf.gather = 0; 867 /* 868 * Indicate gather array is not used 869 */ 870 pd_uinfo->first_gd = 0xffffffff; 871 } 872 if (!num_sd) { 873 /* 874 * we know application give us dst a whole piece of memory 875 * no need to use scatter ring. 876 */ 877 pd_uinfo->first_sd = 0xffffffff; 878 sa->sa_command_0.bf.scatter = 0; 879 pd->dest = (u32)dma_map_page(dev->core_dev->device, 880 sg_page(dst), dst->offset, 881 min(datalen, dst->length), 882 DMA_TO_DEVICE); 883 } else { 884 dma_addr_t sd_dma; 885 struct ce_sd *sd = NULL; 886 887 u32 sd_idx = fst_sd; 888 nbytes = datalen; 889 sa->sa_command_0.bf.scatter = 1; 890 pd_uinfo->first_sd = fst_sd; 891 sd = crypto4xx_get_sdp(dev, &sd_dma, sd_idx); 892 pd->dest = sd_dma; 893 /* setup scatter descriptor */ 894 sd->ctl.done = 0; 895 sd->ctl.rdy = 1; 896 /* sd->ptr should be setup by sd_init routine*/ 897 if (nbytes >= PPC4XX_SD_BUFFER_SIZE) 898 nbytes -= PPC4XX_SD_BUFFER_SIZE; 899 else 900 nbytes = 0; 901 while (nbytes) { 902 sd_idx = get_next_sd(sd_idx); 903 sd = crypto4xx_get_sdp(dev, &sd_dma, sd_idx); 904 /* setup scatter descriptor */ 905 sd->ctl.done = 0; 906 sd->ctl.rdy = 1; 907 if (nbytes >= PPC4XX_SD_BUFFER_SIZE) { 908 nbytes -= PPC4XX_SD_BUFFER_SIZE; 909 } else { 910 /* 911 * SD entry can hold PPC4XX_SD_BUFFER_SIZE, 912 * which is more than nbytes, so done. 913 */ 914 nbytes = 0; 915 } 916 } 917 } 918 919 pd->pd_ctl.w = PD_CTL_HOST_READY | 920 ((crypto_tfm_alg_type(req->tfm) == CRYPTO_ALG_TYPE_AHASH) | 921 (crypto_tfm_alg_type(req->tfm) == CRYPTO_ALG_TYPE_AEAD) ? 922 PD_CTL_HASH_FINAL : 0); 923 pd->pd_ctl_len.w = 0x00400000 | (assoclen + datalen); 924 pd_uinfo->state = PD_ENTRY_INUSE | (is_busy ? PD_ENTRY_BUSY : 0); 925 926 wmb(); 927 /* write any value to push engine to read a pd */ 928 writel(0, dev->ce_base + CRYPTO4XX_INT_DESCR_RD); 929 writel(1, dev->ce_base + CRYPTO4XX_INT_DESCR_RD); 930 return is_busy ? -EBUSY : -EINPROGRESS; 931 } 932 933 /** 934 * Algorithm Registration Functions 935 */ 936 static void crypto4xx_ctx_init(struct crypto4xx_alg *amcc_alg, 937 struct crypto4xx_ctx *ctx) 938 { 939 ctx->dev = amcc_alg->dev; 940 ctx->sa_in = NULL; 941 ctx->sa_out = NULL; 942 ctx->sa_len = 0; 943 } 944 945 static int crypto4xx_sk_init(struct crypto_skcipher *sk) 946 { 947 struct skcipher_alg *alg = crypto_skcipher_alg(sk); 948 struct crypto4xx_alg *amcc_alg; 949 struct crypto4xx_ctx *ctx = crypto_skcipher_ctx(sk); 950 951 if (alg->base.cra_flags & CRYPTO_ALG_NEED_FALLBACK) { 952 ctx->sw_cipher.cipher = 953 crypto_alloc_sync_skcipher(alg->base.cra_name, 0, 954 CRYPTO_ALG_NEED_FALLBACK); 955 if (IS_ERR(ctx->sw_cipher.cipher)) 956 return PTR_ERR(ctx->sw_cipher.cipher); 957 } 958 959 amcc_alg = container_of(alg, struct crypto4xx_alg, alg.u.cipher); 960 crypto4xx_ctx_init(amcc_alg, ctx); 961 return 0; 962 } 963 964 static void crypto4xx_common_exit(struct crypto4xx_ctx *ctx) 965 { 966 crypto4xx_free_sa(ctx); 967 } 968 969 static void crypto4xx_sk_exit(struct crypto_skcipher *sk) 970 { 971 struct crypto4xx_ctx *ctx = crypto_skcipher_ctx(sk); 972 973 crypto4xx_common_exit(ctx); 974 if (ctx->sw_cipher.cipher) 975 crypto_free_sync_skcipher(ctx->sw_cipher.cipher); 976 } 977 978 static int crypto4xx_aead_init(struct crypto_aead *tfm) 979 { 980 struct aead_alg *alg = crypto_aead_alg(tfm); 981 struct crypto4xx_ctx *ctx = crypto_aead_ctx(tfm); 982 struct crypto4xx_alg *amcc_alg; 983 984 ctx->sw_cipher.aead = crypto_alloc_aead(alg->base.cra_name, 0, 985 CRYPTO_ALG_NEED_FALLBACK | 986 CRYPTO_ALG_ASYNC); 987 if (IS_ERR(ctx->sw_cipher.aead)) 988 return PTR_ERR(ctx->sw_cipher.aead); 989 990 amcc_alg = container_of(alg, struct crypto4xx_alg, alg.u.aead); 991 crypto4xx_ctx_init(amcc_alg, ctx); 992 crypto_aead_set_reqsize(tfm, max(sizeof(struct aead_request) + 32 + 993 crypto_aead_reqsize(ctx->sw_cipher.aead), 994 sizeof(struct crypto4xx_aead_reqctx))); 995 return 0; 996 } 997 998 static void crypto4xx_aead_exit(struct crypto_aead *tfm) 999 { 1000 struct crypto4xx_ctx *ctx = crypto_aead_ctx(tfm); 1001 1002 crypto4xx_common_exit(ctx); 1003 crypto_free_aead(ctx->sw_cipher.aead); 1004 } 1005 1006 static int crypto4xx_register_alg(struct crypto4xx_device *sec_dev, 1007 struct crypto4xx_alg_common *crypto_alg, 1008 int array_size) 1009 { 1010 struct crypto4xx_alg *alg; 1011 int i; 1012 int rc = 0; 1013 1014 for (i = 0; i < array_size; i++) { 1015 alg = kzalloc(sizeof(struct crypto4xx_alg), GFP_KERNEL); 1016 if (!alg) 1017 return -ENOMEM; 1018 1019 alg->alg = crypto_alg[i]; 1020 alg->dev = sec_dev; 1021 1022 switch (alg->alg.type) { 1023 case CRYPTO_ALG_TYPE_AEAD: 1024 rc = crypto_register_aead(&alg->alg.u.aead); 1025 break; 1026 1027 case CRYPTO_ALG_TYPE_AHASH: 1028 rc = crypto_register_ahash(&alg->alg.u.hash); 1029 break; 1030 1031 case CRYPTO_ALG_TYPE_RNG: 1032 rc = crypto_register_rng(&alg->alg.u.rng); 1033 break; 1034 1035 default: 1036 rc = crypto_register_skcipher(&alg->alg.u.cipher); 1037 break; 1038 } 1039 1040 if (rc) 1041 kfree(alg); 1042 else 1043 list_add_tail(&alg->entry, &sec_dev->alg_list); 1044 } 1045 1046 return 0; 1047 } 1048 1049 static void crypto4xx_unregister_alg(struct crypto4xx_device *sec_dev) 1050 { 1051 struct crypto4xx_alg *alg, *tmp; 1052 1053 list_for_each_entry_safe(alg, tmp, &sec_dev->alg_list, entry) { 1054 list_del(&alg->entry); 1055 switch (alg->alg.type) { 1056 case CRYPTO_ALG_TYPE_AHASH: 1057 crypto_unregister_ahash(&alg->alg.u.hash); 1058 break; 1059 1060 case CRYPTO_ALG_TYPE_AEAD: 1061 crypto_unregister_aead(&alg->alg.u.aead); 1062 break; 1063 1064 case CRYPTO_ALG_TYPE_RNG: 1065 crypto_unregister_rng(&alg->alg.u.rng); 1066 break; 1067 1068 default: 1069 crypto_unregister_skcipher(&alg->alg.u.cipher); 1070 } 1071 kfree(alg); 1072 } 1073 } 1074 1075 static void crypto4xx_bh_tasklet_cb(unsigned long data) 1076 { 1077 struct device *dev = (struct device *)data; 1078 struct crypto4xx_core_device *core_dev = dev_get_drvdata(dev); 1079 struct pd_uinfo *pd_uinfo; 1080 struct ce_pd *pd; 1081 u32 tail = core_dev->dev->pdr_tail; 1082 u32 head = core_dev->dev->pdr_head; 1083 1084 do { 1085 pd_uinfo = &core_dev->dev->pdr_uinfo[tail]; 1086 pd = &core_dev->dev->pdr[tail]; 1087 if ((pd_uinfo->state & PD_ENTRY_INUSE) && 1088 ((READ_ONCE(pd->pd_ctl.w) & 1089 (PD_CTL_PE_DONE | PD_CTL_HOST_READY)) == 1090 PD_CTL_PE_DONE)) { 1091 crypto4xx_pd_done(core_dev->dev, tail); 1092 tail = crypto4xx_put_pd_to_pdr(core_dev->dev, tail); 1093 } else { 1094 /* if tail not done, break */ 1095 break; 1096 } 1097 } while (head != tail); 1098 } 1099 1100 /** 1101 * Top Half of isr. 1102 */ 1103 static inline irqreturn_t crypto4xx_interrupt_handler(int irq, void *data, 1104 u32 clr_val) 1105 { 1106 struct device *dev = (struct device *)data; 1107 struct crypto4xx_core_device *core_dev = dev_get_drvdata(dev); 1108 1109 writel(clr_val, core_dev->dev->ce_base + CRYPTO4XX_INT_CLR); 1110 tasklet_schedule(&core_dev->tasklet); 1111 1112 return IRQ_HANDLED; 1113 } 1114 1115 static irqreturn_t crypto4xx_ce_interrupt_handler(int irq, void *data) 1116 { 1117 return crypto4xx_interrupt_handler(irq, data, PPC4XX_INTERRUPT_CLR); 1118 } 1119 1120 static irqreturn_t crypto4xx_ce_interrupt_handler_revb(int irq, void *data) 1121 { 1122 return crypto4xx_interrupt_handler(irq, data, PPC4XX_INTERRUPT_CLR | 1123 PPC4XX_TMO_ERR_INT); 1124 } 1125 1126 static int ppc4xx_prng_data_read(struct crypto4xx_device *dev, 1127 u8 *data, unsigned int max) 1128 { 1129 unsigned int i, curr = 0; 1130 u32 val[2]; 1131 1132 do { 1133 /* trigger PRN generation */ 1134 writel(PPC4XX_PRNG_CTRL_AUTO_EN, 1135 dev->ce_base + CRYPTO4XX_PRNG_CTRL); 1136 1137 for (i = 0; i < 1024; i++) { 1138 /* usually 19 iterations are enough */ 1139 if ((readl(dev->ce_base + CRYPTO4XX_PRNG_STAT) & 1140 CRYPTO4XX_PRNG_STAT_BUSY)) 1141 continue; 1142 1143 val[0] = readl_be(dev->ce_base + CRYPTO4XX_PRNG_RES_0); 1144 val[1] = readl_be(dev->ce_base + CRYPTO4XX_PRNG_RES_1); 1145 break; 1146 } 1147 if (i == 1024) 1148 return -ETIMEDOUT; 1149 1150 if ((max - curr) >= 8) { 1151 memcpy(data, &val, 8); 1152 data += 8; 1153 curr += 8; 1154 } else { 1155 /* copy only remaining bytes */ 1156 memcpy(data, &val, max - curr); 1157 break; 1158 } 1159 } while (curr < max); 1160 1161 return curr; 1162 } 1163 1164 static int crypto4xx_prng_generate(struct crypto_rng *tfm, 1165 const u8 *src, unsigned int slen, 1166 u8 *dstn, unsigned int dlen) 1167 { 1168 struct rng_alg *alg = crypto_rng_alg(tfm); 1169 struct crypto4xx_alg *amcc_alg; 1170 struct crypto4xx_device *dev; 1171 int ret; 1172 1173 amcc_alg = container_of(alg, struct crypto4xx_alg, alg.u.rng); 1174 dev = amcc_alg->dev; 1175 1176 mutex_lock(&dev->core_dev->rng_lock); 1177 ret = ppc4xx_prng_data_read(dev, dstn, dlen); 1178 mutex_unlock(&dev->core_dev->rng_lock); 1179 return ret; 1180 } 1181 1182 1183 static int crypto4xx_prng_seed(struct crypto_rng *tfm, const u8 *seed, 1184 unsigned int slen) 1185 { 1186 return 0; 1187 } 1188 1189 /** 1190 * Supported Crypto Algorithms 1191 */ 1192 static struct crypto4xx_alg_common crypto4xx_alg[] = { 1193 /* Crypto AES modes */ 1194 { .type = CRYPTO_ALG_TYPE_SKCIPHER, .u.cipher = { 1195 .base = { 1196 .cra_name = "cbc(aes)", 1197 .cra_driver_name = "cbc-aes-ppc4xx", 1198 .cra_priority = CRYPTO4XX_CRYPTO_PRIORITY, 1199 .cra_flags = CRYPTO_ALG_ASYNC | 1200 CRYPTO_ALG_KERN_DRIVER_ONLY, 1201 .cra_blocksize = AES_BLOCK_SIZE, 1202 .cra_ctxsize = sizeof(struct crypto4xx_ctx), 1203 .cra_module = THIS_MODULE, 1204 }, 1205 .min_keysize = AES_MIN_KEY_SIZE, 1206 .max_keysize = AES_MAX_KEY_SIZE, 1207 .ivsize = AES_IV_SIZE, 1208 .setkey = crypto4xx_setkey_aes_cbc, 1209 .encrypt = crypto4xx_encrypt_iv_block, 1210 .decrypt = crypto4xx_decrypt_iv_block, 1211 .init = crypto4xx_sk_init, 1212 .exit = crypto4xx_sk_exit, 1213 } }, 1214 { .type = CRYPTO_ALG_TYPE_SKCIPHER, .u.cipher = { 1215 .base = { 1216 .cra_name = "cfb(aes)", 1217 .cra_driver_name = "cfb-aes-ppc4xx", 1218 .cra_priority = CRYPTO4XX_CRYPTO_PRIORITY, 1219 .cra_flags = CRYPTO_ALG_ASYNC | 1220 CRYPTO_ALG_KERN_DRIVER_ONLY, 1221 .cra_blocksize = 1, 1222 .cra_ctxsize = sizeof(struct crypto4xx_ctx), 1223 .cra_module = THIS_MODULE, 1224 }, 1225 .min_keysize = AES_MIN_KEY_SIZE, 1226 .max_keysize = AES_MAX_KEY_SIZE, 1227 .ivsize = AES_IV_SIZE, 1228 .setkey = crypto4xx_setkey_aes_cfb, 1229 .encrypt = crypto4xx_encrypt_iv_stream, 1230 .decrypt = crypto4xx_decrypt_iv_stream, 1231 .init = crypto4xx_sk_init, 1232 .exit = crypto4xx_sk_exit, 1233 } }, 1234 { .type = CRYPTO_ALG_TYPE_SKCIPHER, .u.cipher = { 1235 .base = { 1236 .cra_name = "ctr(aes)", 1237 .cra_driver_name = "ctr-aes-ppc4xx", 1238 .cra_priority = CRYPTO4XX_CRYPTO_PRIORITY, 1239 .cra_flags = CRYPTO_ALG_NEED_FALLBACK | 1240 CRYPTO_ALG_ASYNC | 1241 CRYPTO_ALG_KERN_DRIVER_ONLY, 1242 .cra_blocksize = 1, 1243 .cra_ctxsize = sizeof(struct crypto4xx_ctx), 1244 .cra_module = THIS_MODULE, 1245 }, 1246 .min_keysize = AES_MIN_KEY_SIZE, 1247 .max_keysize = AES_MAX_KEY_SIZE, 1248 .ivsize = AES_IV_SIZE, 1249 .setkey = crypto4xx_setkey_aes_ctr, 1250 .encrypt = crypto4xx_encrypt_ctr, 1251 .decrypt = crypto4xx_decrypt_ctr, 1252 .init = crypto4xx_sk_init, 1253 .exit = crypto4xx_sk_exit, 1254 } }, 1255 { .type = CRYPTO_ALG_TYPE_SKCIPHER, .u.cipher = { 1256 .base = { 1257 .cra_name = "rfc3686(ctr(aes))", 1258 .cra_driver_name = "rfc3686-ctr-aes-ppc4xx", 1259 .cra_priority = CRYPTO4XX_CRYPTO_PRIORITY, 1260 .cra_flags = CRYPTO_ALG_ASYNC | 1261 CRYPTO_ALG_KERN_DRIVER_ONLY, 1262 .cra_blocksize = 1, 1263 .cra_ctxsize = sizeof(struct crypto4xx_ctx), 1264 .cra_module = THIS_MODULE, 1265 }, 1266 .min_keysize = AES_MIN_KEY_SIZE + CTR_RFC3686_NONCE_SIZE, 1267 .max_keysize = AES_MAX_KEY_SIZE + CTR_RFC3686_NONCE_SIZE, 1268 .ivsize = CTR_RFC3686_IV_SIZE, 1269 .setkey = crypto4xx_setkey_rfc3686, 1270 .encrypt = crypto4xx_rfc3686_encrypt, 1271 .decrypt = crypto4xx_rfc3686_decrypt, 1272 .init = crypto4xx_sk_init, 1273 .exit = crypto4xx_sk_exit, 1274 } }, 1275 { .type = CRYPTO_ALG_TYPE_SKCIPHER, .u.cipher = { 1276 .base = { 1277 .cra_name = "ecb(aes)", 1278 .cra_driver_name = "ecb-aes-ppc4xx", 1279 .cra_priority = CRYPTO4XX_CRYPTO_PRIORITY, 1280 .cra_flags = CRYPTO_ALG_ASYNC | 1281 CRYPTO_ALG_KERN_DRIVER_ONLY, 1282 .cra_blocksize = AES_BLOCK_SIZE, 1283 .cra_ctxsize = sizeof(struct crypto4xx_ctx), 1284 .cra_module = THIS_MODULE, 1285 }, 1286 .min_keysize = AES_MIN_KEY_SIZE, 1287 .max_keysize = AES_MAX_KEY_SIZE, 1288 .setkey = crypto4xx_setkey_aes_ecb, 1289 .encrypt = crypto4xx_encrypt_noiv_block, 1290 .decrypt = crypto4xx_decrypt_noiv_block, 1291 .init = crypto4xx_sk_init, 1292 .exit = crypto4xx_sk_exit, 1293 } }, 1294 { .type = CRYPTO_ALG_TYPE_SKCIPHER, .u.cipher = { 1295 .base = { 1296 .cra_name = "ofb(aes)", 1297 .cra_driver_name = "ofb-aes-ppc4xx", 1298 .cra_priority = CRYPTO4XX_CRYPTO_PRIORITY, 1299 .cra_flags = CRYPTO_ALG_ASYNC | 1300 CRYPTO_ALG_KERN_DRIVER_ONLY, 1301 .cra_blocksize = 1, 1302 .cra_ctxsize = sizeof(struct crypto4xx_ctx), 1303 .cra_module = THIS_MODULE, 1304 }, 1305 .min_keysize = AES_MIN_KEY_SIZE, 1306 .max_keysize = AES_MAX_KEY_SIZE, 1307 .ivsize = AES_IV_SIZE, 1308 .setkey = crypto4xx_setkey_aes_ofb, 1309 .encrypt = crypto4xx_encrypt_iv_stream, 1310 .decrypt = crypto4xx_decrypt_iv_stream, 1311 .init = crypto4xx_sk_init, 1312 .exit = crypto4xx_sk_exit, 1313 } }, 1314 1315 /* AEAD */ 1316 { .type = CRYPTO_ALG_TYPE_AEAD, .u.aead = { 1317 .setkey = crypto4xx_setkey_aes_ccm, 1318 .setauthsize = crypto4xx_setauthsize_aead, 1319 .encrypt = crypto4xx_encrypt_aes_ccm, 1320 .decrypt = crypto4xx_decrypt_aes_ccm, 1321 .init = crypto4xx_aead_init, 1322 .exit = crypto4xx_aead_exit, 1323 .ivsize = AES_BLOCK_SIZE, 1324 .maxauthsize = 16, 1325 .base = { 1326 .cra_name = "ccm(aes)", 1327 .cra_driver_name = "ccm-aes-ppc4xx", 1328 .cra_priority = CRYPTO4XX_CRYPTO_PRIORITY, 1329 .cra_flags = CRYPTO_ALG_ASYNC | 1330 CRYPTO_ALG_NEED_FALLBACK | 1331 CRYPTO_ALG_KERN_DRIVER_ONLY, 1332 .cra_blocksize = 1, 1333 .cra_ctxsize = sizeof(struct crypto4xx_ctx), 1334 .cra_module = THIS_MODULE, 1335 }, 1336 } }, 1337 { .type = CRYPTO_ALG_TYPE_AEAD, .u.aead = { 1338 .setkey = crypto4xx_setkey_aes_gcm, 1339 .setauthsize = crypto4xx_setauthsize_aead, 1340 .encrypt = crypto4xx_encrypt_aes_gcm, 1341 .decrypt = crypto4xx_decrypt_aes_gcm, 1342 .init = crypto4xx_aead_init, 1343 .exit = crypto4xx_aead_exit, 1344 .ivsize = GCM_AES_IV_SIZE, 1345 .maxauthsize = 16, 1346 .base = { 1347 .cra_name = "gcm(aes)", 1348 .cra_driver_name = "gcm-aes-ppc4xx", 1349 .cra_priority = CRYPTO4XX_CRYPTO_PRIORITY, 1350 .cra_flags = CRYPTO_ALG_ASYNC | 1351 CRYPTO_ALG_NEED_FALLBACK | 1352 CRYPTO_ALG_KERN_DRIVER_ONLY, 1353 .cra_blocksize = 1, 1354 .cra_ctxsize = sizeof(struct crypto4xx_ctx), 1355 .cra_module = THIS_MODULE, 1356 }, 1357 } }, 1358 { .type = CRYPTO_ALG_TYPE_RNG, .u.rng = { 1359 .base = { 1360 .cra_name = "stdrng", 1361 .cra_driver_name = "crypto4xx_rng", 1362 .cra_priority = 300, 1363 .cra_ctxsize = 0, 1364 .cra_module = THIS_MODULE, 1365 }, 1366 .generate = crypto4xx_prng_generate, 1367 .seed = crypto4xx_prng_seed, 1368 .seedsize = 0, 1369 } }, 1370 }; 1371 1372 /** 1373 * Module Initialization Routine 1374 */ 1375 static int crypto4xx_probe(struct platform_device *ofdev) 1376 { 1377 int rc; 1378 struct resource res; 1379 struct device *dev = &ofdev->dev; 1380 struct crypto4xx_core_device *core_dev; 1381 u32 pvr; 1382 bool is_revb = true; 1383 1384 rc = of_address_to_resource(ofdev->dev.of_node, 0, &res); 1385 if (rc) 1386 return -ENODEV; 1387 1388 if (of_find_compatible_node(NULL, NULL, "amcc,ppc460ex-crypto")) { 1389 mtdcri(SDR0, PPC460EX_SDR0_SRST, 1390 mfdcri(SDR0, PPC460EX_SDR0_SRST) | PPC460EX_CE_RESET); 1391 mtdcri(SDR0, PPC460EX_SDR0_SRST, 1392 mfdcri(SDR0, PPC460EX_SDR0_SRST) & ~PPC460EX_CE_RESET); 1393 } else if (of_find_compatible_node(NULL, NULL, 1394 "amcc,ppc405ex-crypto")) { 1395 mtdcri(SDR0, PPC405EX_SDR0_SRST, 1396 mfdcri(SDR0, PPC405EX_SDR0_SRST) | PPC405EX_CE_RESET); 1397 mtdcri(SDR0, PPC405EX_SDR0_SRST, 1398 mfdcri(SDR0, PPC405EX_SDR0_SRST) & ~PPC405EX_CE_RESET); 1399 is_revb = false; 1400 } else if (of_find_compatible_node(NULL, NULL, 1401 "amcc,ppc460sx-crypto")) { 1402 mtdcri(SDR0, PPC460SX_SDR0_SRST, 1403 mfdcri(SDR0, PPC460SX_SDR0_SRST) | PPC460SX_CE_RESET); 1404 mtdcri(SDR0, PPC460SX_SDR0_SRST, 1405 mfdcri(SDR0, PPC460SX_SDR0_SRST) & ~PPC460SX_CE_RESET); 1406 } else { 1407 printk(KERN_ERR "Crypto Function Not supported!\n"); 1408 return -EINVAL; 1409 } 1410 1411 core_dev = kzalloc(sizeof(struct crypto4xx_core_device), GFP_KERNEL); 1412 if (!core_dev) 1413 return -ENOMEM; 1414 1415 dev_set_drvdata(dev, core_dev); 1416 core_dev->ofdev = ofdev; 1417 core_dev->dev = kzalloc(sizeof(struct crypto4xx_device), GFP_KERNEL); 1418 rc = -ENOMEM; 1419 if (!core_dev->dev) 1420 goto err_alloc_dev; 1421 1422 /* 1423 * Older version of 460EX/GT have a hardware bug. 1424 * Hence they do not support H/W based security intr coalescing 1425 */ 1426 pvr = mfspr(SPRN_PVR); 1427 if (is_revb && ((pvr >> 4) == 0x130218A)) { 1428 u32 min = PVR_MIN(pvr); 1429 1430 if (min < 4) { 1431 dev_info(dev, "RevA detected - disable interrupt coalescing\n"); 1432 is_revb = false; 1433 } 1434 } 1435 1436 core_dev->dev->core_dev = core_dev; 1437 core_dev->dev->is_revb = is_revb; 1438 core_dev->device = dev; 1439 mutex_init(&core_dev->rng_lock); 1440 spin_lock_init(&core_dev->lock); 1441 INIT_LIST_HEAD(&core_dev->dev->alg_list); 1442 ratelimit_default_init(&core_dev->dev->aead_ratelimit); 1443 rc = crypto4xx_build_sdr(core_dev->dev); 1444 if (rc) 1445 goto err_build_sdr; 1446 rc = crypto4xx_build_pdr(core_dev->dev); 1447 if (rc) 1448 goto err_build_sdr; 1449 1450 rc = crypto4xx_build_gdr(core_dev->dev); 1451 if (rc) 1452 goto err_build_sdr; 1453 1454 /* Init tasklet for bottom half processing */ 1455 tasklet_init(&core_dev->tasklet, crypto4xx_bh_tasklet_cb, 1456 (unsigned long) dev); 1457 1458 core_dev->dev->ce_base = of_iomap(ofdev->dev.of_node, 0); 1459 if (!core_dev->dev->ce_base) { 1460 dev_err(dev, "failed to of_iomap\n"); 1461 rc = -ENOMEM; 1462 goto err_iomap; 1463 } 1464 1465 /* Register for Crypto isr, Crypto Engine IRQ */ 1466 core_dev->irq = irq_of_parse_and_map(ofdev->dev.of_node, 0); 1467 rc = request_irq(core_dev->irq, is_revb ? 1468 crypto4xx_ce_interrupt_handler_revb : 1469 crypto4xx_ce_interrupt_handler, 0, 1470 KBUILD_MODNAME, dev); 1471 if (rc) 1472 goto err_request_irq; 1473 1474 /* need to setup pdr, rdr, gdr and sdr before this */ 1475 crypto4xx_hw_init(core_dev->dev); 1476 1477 /* Register security algorithms with Linux CryptoAPI */ 1478 rc = crypto4xx_register_alg(core_dev->dev, crypto4xx_alg, 1479 ARRAY_SIZE(crypto4xx_alg)); 1480 if (rc) 1481 goto err_start_dev; 1482 1483 ppc4xx_trng_probe(core_dev); 1484 return 0; 1485 1486 err_start_dev: 1487 free_irq(core_dev->irq, dev); 1488 err_request_irq: 1489 irq_dispose_mapping(core_dev->irq); 1490 iounmap(core_dev->dev->ce_base); 1491 err_iomap: 1492 tasklet_kill(&core_dev->tasklet); 1493 err_build_sdr: 1494 crypto4xx_destroy_sdr(core_dev->dev); 1495 crypto4xx_destroy_gdr(core_dev->dev); 1496 crypto4xx_destroy_pdr(core_dev->dev); 1497 kfree(core_dev->dev); 1498 err_alloc_dev: 1499 kfree(core_dev); 1500 1501 return rc; 1502 } 1503 1504 static int crypto4xx_remove(struct platform_device *ofdev) 1505 { 1506 struct device *dev = &ofdev->dev; 1507 struct crypto4xx_core_device *core_dev = dev_get_drvdata(dev); 1508 1509 ppc4xx_trng_remove(core_dev); 1510 1511 free_irq(core_dev->irq, dev); 1512 irq_dispose_mapping(core_dev->irq); 1513 1514 tasklet_kill(&core_dev->tasklet); 1515 /* Un-register with Linux CryptoAPI */ 1516 crypto4xx_unregister_alg(core_dev->dev); 1517 mutex_destroy(&core_dev->rng_lock); 1518 /* Free all allocated memory */ 1519 crypto4xx_stop_all(core_dev); 1520 1521 return 0; 1522 } 1523 1524 static const struct of_device_id crypto4xx_match[] = { 1525 { .compatible = "amcc,ppc4xx-crypto",}, 1526 { }, 1527 }; 1528 MODULE_DEVICE_TABLE(of, crypto4xx_match); 1529 1530 static struct platform_driver crypto4xx_driver = { 1531 .driver = { 1532 .name = KBUILD_MODNAME, 1533 .of_match_table = crypto4xx_match, 1534 }, 1535 .probe = crypto4xx_probe, 1536 .remove = crypto4xx_remove, 1537 }; 1538 1539 module_platform_driver(crypto4xx_driver); 1540 1541 MODULE_LICENSE("GPL"); 1542 MODULE_AUTHOR("James Hsiao <jhsiao@amcc.com>"); 1543 MODULE_DESCRIPTION("Driver for AMCC PPC4xx crypto accelerator"); 1544