drivers/crypto/picoxcell_crypto.c

   1 /*
   2  * Copyright (c) 2010-2011 Picochip Ltd., Jamie Iles
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17  */
  18 #include <crypto/internal/aead.h>
  19 #include <crypto/aes.h>
  20 #include <crypto/algapi.h>
  21 #include <crypto/authenc.h>
  22 #include <crypto/des.h>
  23 #include <crypto/md5.h>
  24 #include <crypto/sha.h>
  25 #include <crypto/internal/skcipher.h>
  26 #include <linux/clk.h>
  27 #include <linux/crypto.h>
  28 #include <linux/delay.h>
  29 #include <linux/dma-mapping.h>
  30 #include <linux/dmapool.h>
  31 #include <linux/err.h>
  32 #include <linux/init.h>
  33 #include <linux/interrupt.h>
  34 #include <linux/io.h>
  35 #include <linux/list.h>
  36 #include <linux/module.h>
  37 #include <linux/of.h>
  38 #include <linux/platform_device.h>
  39 #include <linux/pm.h>
  40 #include <linux/rtnetlink.h>
  41 #include <linux/scatterlist.h>
  42 #include <linux/sched.h>
  43 #include <linux/sizes.h>
  44 #include <linux/slab.h>
  45 #include <linux/timer.h>
  46
  47 #include "picoxcell_crypto_regs.h"
  48
  49 /*
  50  * The threshold for the number of entries in the CMD FIFO available before
  51  * the CMD0_CNT interrupt is raised. Increasing this value will reduce the
  52  * number of interrupts raised to the CPU.
  53  */
  54 #define CMD0_IRQ_THRESHOLD   1
  55
  56 /*
  57  * The timeout period (in jiffies) for a PDU. When the the number of PDUs in
  58  * flight is greater than the STAT_IRQ_THRESHOLD or 0 the timer is disabled.
  59  * When there are packets in flight but lower than the threshold, we enable
  60  * the timer and at expiry, attempt to remove any processed packets from the
  61  * queue and if there are still packets left, schedule the timer again.
  62  */
  63 #define PACKET_TIMEOUT      1
  64
  65 /* The priority to register each algorithm with. */
  66 #define SPACC_CRYPTO_ALG_PRIORITY       10000
  67
  68 #define SPACC_CRYPTO_KASUMI_F8_KEY_LEN  16
  69 #define SPACC_CRYPTO_IPSEC_CIPHER_PG_SZ 64
  70 #define SPACC_CRYPTO_IPSEC_HASH_PG_SZ   64
  71 #define SPACC_CRYPTO_IPSEC_MAX_CTXS     32
  72 #define SPACC_CRYPTO_IPSEC_FIFO_SZ      32
  73 #define SPACC_CRYPTO_L2_CIPHER_PG_SZ    64
  74 #define SPACC_CRYPTO_L2_HASH_PG_SZ      64
  75 #define SPACC_CRYPTO_L2_MAX_CTXS        128
  76 #define SPACC_CRYPTO_L2_FIFO_SZ         128
  77
  78 #define MAX_DDT_LEN                     16
  79
  80 /* DDT format. This must match the hardware DDT format exactly. */
  81 struct spacc_ddt {
  82         dma_addr_t      p;
  83         u32             len;
  84 };
  85
  86 /*
  87  * Asynchronous crypto request structure.
  88  *
  89  * This structure defines a request that is either queued for processing or
  90  * being processed.
  91  */
  92 struct spacc_req {
  93         struct list_head                list;
  94         struct spacc_engine             *engine;
  95         struct crypto_async_request     *req;
  96         int                             result;
  97         bool                            is_encrypt;
  98         unsigned                        ctx_id;
  99         dma_addr_t                      src_addr, dst_addr;
 100         struct spacc_ddt                *src_ddt, *dst_ddt;
 101         void                            (*complete)(struct spacc_req *req);
 102 };
 103
 104 struct spacc_aead {
 105         unsigned long                   ctrl_default;
 106         unsigned long                   type;
 107         struct aead_alg                 alg;
 108         struct spacc_engine             *engine;
 109         struct list_head                entry;
 110         int                             key_offs;
 111         int                             iv_offs;
 112 };
 113
 114 struct spacc_engine {
 115         void __iomem                    *regs;
 116         struct list_head                pending;
 117         int                             next_ctx;
 118         spinlock_t                      hw_lock;
 119         int                             in_flight;
 120         struct list_head                completed;
 121         struct list_head                in_progress;
 122         struct tasklet_struct           complete;
 123         unsigned long                   fifo_sz;
 124         void __iomem                    *cipher_ctx_base;
 125         void __iomem                    *hash_key_base;
 126         struct spacc_alg                *algs;
 127         unsigned                        num_algs;
 128         struct list_head                registered_algs;
 129         struct spacc_aead               *aeads;
 130         unsigned                        num_aeads;
 131         struct list_head                registered_aeads;
 132         size_t                          cipher_pg_sz;
 133         size_t                          hash_pg_sz;
 134         const char                      *name;
 135         struct clk                      *clk;
 136         struct device                   *dev;
 137         unsigned                        max_ctxs;
 138         struct timer_list               packet_timeout;
 139         unsigned                        stat_irq_thresh;
 140         struct dma_pool                 *req_pool;
 141 };
 142
 143 /* Algorithm type mask. */
 144 #define SPACC_CRYPTO_ALG_MASK           0x7
 145
 146 /* SPACC definition of a crypto algorithm. */
 147 struct spacc_alg {
 148         unsigned long                   ctrl_default;
 149         unsigned long                   type;
 150         struct crypto_alg               alg;
 151         struct spacc_engine             *engine;
 152         struct list_head                entry;
 153         int                             key_offs;
 154         int                             iv_offs;
 155 };
 156
 157 /* Generic context structure for any algorithm type. */
 158 struct spacc_generic_ctx {
 159         struct spacc_engine             *engine;
 160         int                             flags;
 161         int                             key_offs;
 162         int                             iv_offs;
 163 };
 164
 165 /* Block cipher context. */
 166 struct spacc_ablk_ctx {
 167         struct spacc_generic_ctx        generic;
 168         u8                              key[AES_MAX_KEY_SIZE];
 169         u8                              key_len;
 170         /*
 171          * The fallback cipher. If the operation can't be done in hardware,
 172          * fallback to a software version.
 173          */
 174         struct crypto_skcipher          *sw_cipher;
 175 };
 176
 177 /* AEAD cipher context. */
 178 struct spacc_aead_ctx {
 179         struct spacc_generic_ctx        generic;
 180         u8                              cipher_key[AES_MAX_KEY_SIZE];
 181         u8                              hash_ctx[SPACC_CRYPTO_IPSEC_HASH_PG_SZ];
 182         u8                              cipher_key_len;
 183         u8                              hash_key_len;
 184         struct crypto_aead              *sw_cipher;
 185 };
 186
 187 static int spacc_ablk_submit(struct spacc_req *req);
 188
 189 static inline struct spacc_alg *to_spacc_alg(struct crypto_alg *alg)
 190 {
 191         return alg ? container_of(alg, struct spacc_alg, alg) : NULL;
 192 }
 193
 194 static inline struct spacc_aead *to_spacc_aead(struct aead_alg *alg)
 195 {
 196         return container_of(alg, struct spacc_aead, alg);
 197 }
 198
 199 static inline int spacc_fifo_cmd_full(struct spacc_engine *engine)
 200 {
 201         u32 fifo_stat = readl(engine->regs + SPA_FIFO_STAT_REG_OFFSET);
 202
 203         return fifo_stat & SPA_FIFO_CMD_FULL;
 204 }
 205
 206 /*
 207  * Given a cipher context, and a context number, get the base address of the
 208  * context page.
 209  *
 210  * Returns the address of the context page where the key/context may
 211  * be written.
 212  */
 213 static inline void __iomem *spacc_ctx_page_addr(struct spacc_generic_ctx *ctx,
 214                                                 unsigned indx,
 215                                                 bool is_cipher_ctx)
 216 {
 217         return is_cipher_ctx ? ctx->engine->cipher_ctx_base +
 218                         (indx * ctx->engine->cipher_pg_sz) :
 219                 ctx->engine->hash_key_base + (indx * ctx->engine->hash_pg_sz);
 220 }
 221
 222 /* The context pages can only be written with 32-bit accesses. */
 223 static inline void memcpy_toio32(u32 __iomem *dst, const void *src,
 224                                  unsigned count)
 225 {
 226         const u32 *src32 = (const u32 *) src;
 227
 228         while (count--)
 229                 writel(*src32++, dst++);
 230 }
 231
 232 static void spacc_cipher_write_ctx(struct spacc_generic_ctx *ctx,
 233                                    void __iomem *page_addr, const u8 *key,
 234                                    size_t key_len, const u8 *iv, size_t iv_len)
 235 {
 236         void __iomem *key_ptr = page_addr + ctx->key_offs;
 237         void __iomem *iv_ptr = page_addr + ctx->iv_offs;
 238
 239         memcpy_toio32(key_ptr, key, key_len / 4);
 240         memcpy_toio32(iv_ptr, iv, iv_len / 4);
 241 }
 242
 243 /*
 244  * Load a context into the engines context memory.
 245  *
 246  * Returns the index of the context page where the context was loaded.
 247  */
 248 static unsigned spacc_load_ctx(struct spacc_generic_ctx *ctx,
 249                                const u8 *ciph_key, size_t ciph_len,
 250                                const u8 *iv, size_t ivlen, const u8 *hash_key,
 251                                size_t hash_len)
 252 {
 253         unsigned indx = ctx->engine->next_ctx++;
 254         void __iomem *ciph_page_addr, *hash_page_addr;
 255
 256         ciph_page_addr = spacc_ctx_page_addr(ctx, indx, 1);
 257         hash_page_addr = spacc_ctx_page_addr(ctx, indx, 0);
 258
 259         ctx->engine->next_ctx &= ctx->engine->fifo_sz - 1;
 260         spacc_cipher_write_ctx(ctx, ciph_page_addr, ciph_key, ciph_len, iv,
 261                                ivlen);
 262         writel(ciph_len | (indx << SPA_KEY_SZ_CTX_INDEX_OFFSET) |
 263                (1 << SPA_KEY_SZ_CIPHER_OFFSET),
 264                ctx->engine->regs + SPA_KEY_SZ_REG_OFFSET);
 265
 266         if (hash_key) {
 267                 memcpy_toio32(hash_page_addr, hash_key, hash_len / 4);
 268                 writel(hash_len | (indx << SPA_KEY_SZ_CTX_INDEX_OFFSET),
 269                        ctx->engine->regs + SPA_KEY_SZ_REG_OFFSET);
 270         }
 271
 272         return indx;
 273 }
 274
 275 static inline void ddt_set(struct spacc_ddt *ddt, dma_addr_t phys, size_t len)
 276 {
 277         ddt->p = phys;
 278         ddt->len = len;
 279 }
 280
 281 /*
 282  * Take a crypto request and scatterlists for the data and turn them into DDTs
 283  * for passing to the crypto engines. This also DMA maps the data so that the
 284  * crypto engines can DMA to/from them.
 285  */
 286 static struct spacc_ddt *spacc_sg_to_ddt(struct spacc_engine *engine,
 287                                          struct scatterlist *payload,
 288                                          unsigned nbytes,
 289                                          enum dma_data_direction dir,
 290                                          dma_addr_t *ddt_phys)
 291 {
 292         unsigned mapped_ents;
 293         struct scatterlist *cur;
 294         struct spacc_ddt *ddt;
 295         int i;
 296         int nents;
 297
 298         nents = sg_nents_for_len(payload, nbytes);
 299         if (nents < 0) {
 300                 dev_err(engine->dev, "Invalid numbers of SG.\n");
 301                 return NULL;
 302         }
 303         mapped_ents = dma_map_sg(engine->dev, payload, nents, dir);
 304
 305         if (mapped_ents + 1 > MAX_DDT_LEN)
 306                 goto out;
 307
 308         ddt = dma_pool_alloc(engine->req_pool, GFP_ATOMIC, ddt_phys);
 309         if (!ddt)
 310                 goto out;
 311
 312         for_each_sg(payload, cur, mapped_ents, i)
 313                 ddt_set(&ddt[i], sg_dma_address(cur), sg_dma_len(cur));
 314         ddt_set(&ddt[mapped_ents], 0, 0);
 315
 316         return ddt;
 317
 318 out:
 319         dma_unmap_sg(engine->dev, payload, nents, dir);
 320         return NULL;
 321 }
 322
 323 static int spacc_aead_make_ddts(struct aead_request *areq)
 324 {
 325         struct crypto_aead *aead = crypto_aead_reqtfm(areq);
 326         struct spacc_req *req = aead_request_ctx(areq);
 327         struct spacc_engine *engine = req->engine;
 328         struct spacc_ddt *src_ddt, *dst_ddt;
 329         unsigned total;
 330         int src_nents, dst_nents;
 331         struct scatterlist *cur;
 332         int i, dst_ents, src_ents;
 333
 334         total = areq->assoclen + areq->cryptlen;
 335         if (req->is_encrypt)
 336                 total += crypto_aead_authsize(aead);
 337
 338         src_nents = sg_nents_for_len(areq->src, total);
 339         if (src_nents < 0) {
 340                 dev_err(engine->dev, "Invalid numbers of src SG.\n");
 341                 return src_nents;
 342         }
 343         if (src_nents + 1 > MAX_DDT_LEN)
 344                 return -E2BIG;
 345
 346         dst_nents = 0;
 347         if (areq->src != areq->dst) {
 348                 dst_nents = sg_nents_for_len(areq->dst, total);
 349                 if (dst_nents < 0) {
 350                         dev_err(engine->dev, "Invalid numbers of dst SG.\n");
 351                         return dst_nents;
 352                 }
 353                 if (src_nents + 1 > MAX_DDT_LEN)
 354                         return -E2BIG;
 355         }
 356
 357         src_ddt = dma_pool_alloc(engine->req_pool, GFP_ATOMIC, &req->src_addr);
 358         if (!src_ddt)
 359                 goto err;
 360
 361         dst_ddt = dma_pool_alloc(engine->req_pool, GFP_ATOMIC, &req->dst_addr);
 362         if (!dst_ddt)
 363                 goto err_free_src;
 364
 365         req->src_ddt = src_ddt;
 366         req->dst_ddt = dst_ddt;
 367
 368         if (dst_nents) {
 369                 src_ents = dma_map_sg(engine->dev, areq->src, src_nents,
 370                                       DMA_TO_DEVICE);
 371                 if (!src_ents)
 372                         goto err_free_dst;
 373
 374                 dst_ents = dma_map_sg(engine->dev, areq->dst, dst_nents,
 375                                       DMA_FROM_DEVICE);
 376
 377                 if (!dst_ents) {
 378                         dma_unmap_sg(engine->dev, areq->src, src_nents,
 379                                      DMA_TO_DEVICE);
 380                         goto err_free_dst;
 381                 }
 382         } else {
 383                 src_ents = dma_map_sg(engine->dev, areq->src, src_nents,
 384                                       DMA_BIDIRECTIONAL);
 385                 if (!src_ents)
 386                         goto err_free_dst;
 387                 dst_ents = src_ents;
 388         }
 389
 390         /*
 391          * Now map in the payload for the source and destination and terminate
 392          * with the NULL pointers.
 393          */
 394         for_each_sg(areq->src, cur, src_ents, i)
 395                 ddt_set(src_ddt++, sg_dma_address(cur), sg_dma_len(cur));
 396
 397         /* For decryption we need to skip the associated data. */
 398         total = req->is_encrypt ? 0 : areq->assoclen;
 399         for_each_sg(areq->dst, cur, dst_ents, i) {
 400                 unsigned len = sg_dma_len(cur);
 401
 402                 if (len <= total) {
 403                         total -= len;
 404                         continue;
 405                 }
 406
 407                 ddt_set(dst_ddt++, sg_dma_address(cur) + total, len - total);
 408         }
 409
 410         ddt_set(src_ddt, 0, 0);
 411         ddt_set(dst_ddt, 0, 0);
 412
 413         return 0;
 414
 415 err_free_dst:
 416         dma_pool_free(engine->req_pool, dst_ddt, req->dst_addr);
 417 err_free_src:
 418         dma_pool_free(engine->req_pool, src_ddt, req->src_addr);
 419 err:
 420         return -ENOMEM;
 421 }
 422
 423 static void spacc_aead_free_ddts(struct spacc_req *req)
 424 {
 425         struct aead_request *areq = container_of(req->req, struct aead_request,
 426                                                  base);
 427         struct crypto_aead *aead = crypto_aead_reqtfm(areq);
 428         unsigned total = areq->assoclen + areq->cryptlen +
 429                          (req->is_encrypt ? crypto_aead_authsize(aead) : 0);
 430         struct spacc_aead_ctx *aead_ctx = crypto_aead_ctx(aead);
 431         struct spacc_engine *engine = aead_ctx->generic.engine;
 432         int nents = sg_nents_for_len(areq->src, total);
 433
 434         /* sg_nents_for_len should not fail since it works when mapping sg */
 435         if (unlikely(nents < 0)) {
 436                 dev_err(engine->dev, "Invalid numbers of src SG.\n");
 437                 return;
 438         }
 439
 440         if (areq->src != areq->dst) {
 441                 dma_unmap_sg(engine->dev, areq->src, nents, DMA_TO_DEVICE);
 442                 nents = sg_nents_for_len(areq->dst, total);
 443                 if (unlikely(nents < 0)) {
 444                         dev_err(engine->dev, "Invalid numbers of dst SG.\n");
 445                         return;
 446                 }
 447                 dma_unmap_sg(engine->dev, areq->dst, nents, DMA_FROM_DEVICE);
 448         } else
 449                 dma_unmap_sg(engine->dev, areq->src, nents, DMA_BIDIRECTIONAL);
 450
 451         dma_pool_free(engine->req_pool, req->src_ddt, req->src_addr);
 452         dma_pool_free(engine->req_pool, req->dst_ddt, req->dst_addr);
 453 }
 454
 455 static void spacc_free_ddt(struct spacc_req *req, struct spacc_ddt *ddt,
 456                            dma_addr_t ddt_addr, struct scatterlist *payload,
 457                            unsigned nbytes, enum dma_data_direction dir)
 458 {
 459         int nents = sg_nents_for_len(payload, nbytes);
 460
 461         if (nents < 0) {
 462                 dev_err(req->engine->dev, "Invalid numbers of SG.\n");
 463                 return;
 464         }
 465
 466         dma_unmap_sg(req->engine->dev, payload, nents, dir);
 467         dma_pool_free(req->engine->req_pool, ddt, ddt_addr);
 468 }
 469
 470 static int spacc_aead_setkey(struct crypto_aead *tfm, const u8 *key,
 471                              unsigned int keylen)
 472 {
 473         struct spacc_aead_ctx *ctx = crypto_aead_ctx(tfm);
 474         struct crypto_authenc_keys keys;
 475         int err;
 476
 477         crypto_aead_clear_flags(ctx->sw_cipher, CRYPTO_TFM_REQ_MASK);
 478         crypto_aead_set_flags(ctx->sw_cipher, crypto_aead_get_flags(tfm) &
 479                                               CRYPTO_TFM_REQ_MASK);
 480         err = crypto_aead_setkey(ctx->sw_cipher, key, keylen);
 481         crypto_aead_clear_flags(tfm, CRYPTO_TFM_RES_MASK);
 482         crypto_aead_set_flags(tfm, crypto_aead_get_flags(ctx->sw_cipher) &
 483                                    CRYPTO_TFM_RES_MASK);
 484         if (err)
 485                 return err;
 486
 487         if (crypto_authenc_extractkeys(&keys, key, keylen) != 0)
 488                 goto badkey;
 489
 490         if (keys.enckeylen > AES_MAX_KEY_SIZE)
 491                 goto badkey;
 492
 493         if (keys.authkeylen > sizeof(ctx->hash_ctx))
 494                 goto badkey;
 495
 496         memcpy(ctx->cipher_key, keys.enckey, keys.enckeylen);
 497         ctx->cipher_key_len = keys.enckeylen;
 498
 499         memcpy(ctx->hash_ctx, keys.authkey, keys.authkeylen);
 500         ctx->hash_key_len = keys.authkeylen;
 501
 502         memzero_explicit(&keys, sizeof(keys));
 503         return 0;
 504
 505 badkey:
 506         crypto_aead_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
 507         memzero_explicit(&keys, sizeof(keys));
 508         return -EINVAL;
 509 }
 510
 511 static int spacc_aead_setauthsize(struct crypto_aead *tfm,
 512                                   unsigned int authsize)
 513 {
 514         struct spacc_aead_ctx *ctx = crypto_tfm_ctx(crypto_aead_tfm(tfm));
 515
 516         return crypto_aead_setauthsize(ctx->sw_cipher, authsize);
 517 }
 518
 519 /*
 520  * Check if an AEAD request requires a fallback operation. Some requests can't
 521  * be completed in hardware because the hardware may not support certain key
 522  * sizes. In these cases we need to complete the request in software.
 523  */
 524 static int spacc_aead_need_fallback(struct aead_request *aead_req)
 525 {
 526         struct crypto_aead *aead = crypto_aead_reqtfm(aead_req);
 527         struct aead_alg *alg = crypto_aead_alg(aead);
 528         struct spacc_aead *spacc_alg = to_spacc_aead(alg);
 529         struct spacc_aead_ctx *ctx = crypto_aead_ctx(aead);
 530
 531         /*
 532          * If we have a non-supported key-length, then we need to do a
 533          * software fallback.
 534          */
 535         if ((spacc_alg->ctrl_default & SPACC_CRYPTO_ALG_MASK) ==
 536             SPA_CTRL_CIPH_ALG_AES &&
 537             ctx->cipher_key_len != AES_KEYSIZE_128 &&
 538             ctx->cipher_key_len != AES_KEYSIZE_256)
 539                 return 1;
 540
 541         return 0;
 542 }
 543
 544 static int spacc_aead_do_fallback(struct aead_request *req, unsigned alg_type,
 545                                   bool is_encrypt)
 546 {
 547         struct crypto_tfm *old_tfm = crypto_aead_tfm(crypto_aead_reqtfm(req));
 548         struct spacc_aead_ctx *ctx = crypto_tfm_ctx(old_tfm);
 549         struct aead_request *subreq = aead_request_ctx(req);
 550
 551         aead_request_set_tfm(subreq, ctx->sw_cipher);
 552         aead_request_set_callback(subreq, req->base.flags,
 553                                   req->base.complete, req->base.data);
 554         aead_request_set_crypt(subreq, req->src, req->dst, req->cryptlen,
 555                                req->iv);
 556         aead_request_set_ad(subreq, req->assoclen);
 557
 558         return is_encrypt ? crypto_aead_encrypt(subreq) :
 559                             crypto_aead_decrypt(subreq);
 560 }
 561
 562 static void spacc_aead_complete(struct spacc_req *req)
 563 {
 564         spacc_aead_free_ddts(req);
 565         req->req->complete(req->req, req->result);
 566 }
 567
 568 static int spacc_aead_submit(struct spacc_req *req)
 569 {
 570         struct aead_request *aead_req =
 571                 container_of(req->req, struct aead_request, base);
 572         struct crypto_aead *aead = crypto_aead_reqtfm(aead_req);
 573         unsigned int authsize = crypto_aead_authsize(aead);
 574         struct spacc_aead_ctx *ctx = crypto_aead_ctx(aead);
 575         struct aead_alg *alg = crypto_aead_alg(aead);
 576         struct spacc_aead *spacc_alg = to_spacc_aead(alg);
 577         struct spacc_engine *engine = ctx->generic.engine;
 578         u32 ctrl, proc_len, assoc_len;
 579
 580         req->result = -EINPROGRESS;
 581         req->ctx_id = spacc_load_ctx(&ctx->generic, ctx->cipher_key,
 582                 ctx->cipher_key_len, aead_req->iv, crypto_aead_ivsize(aead),
 583                 ctx->hash_ctx, ctx->hash_key_len);
 584
 585         /* Set the source and destination DDT pointers. */
 586         writel(req->src_addr, engine->regs + SPA_SRC_PTR_REG_OFFSET);
 587         writel(req->dst_addr, engine->regs + SPA_DST_PTR_REG_OFFSET);
 588         writel(0, engine->regs + SPA_OFFSET_REG_OFFSET);
 589
 590         assoc_len = aead_req->assoclen;
 591         proc_len = aead_req->cryptlen + assoc_len;
 592
 593         /*
 594          * If we are decrypting, we need to take the length of the ICV out of
 595          * the processing length.
 596          */
 597         if (!req->is_encrypt)
 598                 proc_len -= authsize;
 599
 600         writel(proc_len, engine->regs + SPA_PROC_LEN_REG_OFFSET);
 601         writel(assoc_len, engine->regs + SPA_AAD_LEN_REG_OFFSET);
 602         writel(authsize, engine->regs + SPA_ICV_LEN_REG_OFFSET);
 603         writel(0, engine->regs + SPA_ICV_OFFSET_REG_OFFSET);
 604         writel(0, engine->regs + SPA_AUX_INFO_REG_OFFSET);
 605
 606         ctrl = spacc_alg->ctrl_default | (req->ctx_id << SPA_CTRL_CTX_IDX) |
 607                 (1 << SPA_CTRL_ICV_APPEND);
 608         if (req->is_encrypt)
 609                 ctrl |= (1 << SPA_CTRL_ENCRYPT_IDX) | (1 << SPA_CTRL_AAD_COPY);
 610         else
 611                 ctrl |= (1 << SPA_CTRL_KEY_EXP);
 612
 613         mod_timer(&engine->packet_timeout, jiffies + PACKET_TIMEOUT);
 614
 615         writel(ctrl, engine->regs + SPA_CTRL_REG_OFFSET);
 616
 617         return -EINPROGRESS;
 618 }
 619
 620 static int spacc_req_submit(struct spacc_req *req);
 621
 622 static void spacc_push(struct spacc_engine *engine)
 623 {
 624         struct spacc_req *req;
 625
 626         while (!list_empty(&engine->pending) &&
 627                engine->in_flight + 1 <= engine->fifo_sz) {
 628
 629                 ++engine->in_flight;
 630                 req = list_first_entry(&engine->pending, struct spacc_req,
 631                                        list);
 632                 list_move_tail(&req->list, &engine->in_progress);
 633
 634                 req->result = spacc_req_submit(req);
 635         }
 636 }
 637
 638 /*
 639  * Setup an AEAD request for processing. This will configure the engine, load
 640  * the context and then start the packet processing.
 641  */
 642 static int spacc_aead_setup(struct aead_request *req,
 643                             unsigned alg_type, bool is_encrypt)
 644 {
 645         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 646         struct aead_alg *alg = crypto_aead_alg(aead);
 647         struct spacc_engine *engine = to_spacc_aead(alg)->engine;
 648         struct spacc_req *dev_req = aead_request_ctx(req);
 649         int err;
 650         unsigned long flags;
 651
 652         dev_req->req            = &req->base;
 653         dev_req->is_encrypt     = is_encrypt;
 654         dev_req->result         = -EBUSY;
 655         dev_req->engine         = engine;
 656         dev_req->complete       = spacc_aead_complete;
 657
 658         if (unlikely(spacc_aead_need_fallback(req) ||
 659                      ((err = spacc_aead_make_ddts(req)) == -E2BIG)))
 660                 return spacc_aead_do_fallback(req, alg_type, is_encrypt);
 661
 662         if (err)
 663                 goto out;
 664
 665         err = -EINPROGRESS;
 666         spin_lock_irqsave(&engine->hw_lock, flags);
 667         if (unlikely(spacc_fifo_cmd_full(engine)) ||
 668             engine->in_flight + 1 > engine->fifo_sz) {
 669                 if (!(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
 670                         err = -EBUSY;
 671                         spin_unlock_irqrestore(&engine->hw_lock, flags);
 672                         goto out_free_ddts;
 673                 }
 674                 list_add_tail(&dev_req->list, &engine->pending);
 675         } else {
 676                 list_add_tail(&dev_req->list, &engine->pending);
 677                 spacc_push(engine);
 678         }
 679         spin_unlock_irqrestore(&engine->hw_lock, flags);
 680
 681         goto out;
 682
 683 out_free_ddts:
 684         spacc_aead_free_ddts(dev_req);
 685 out:
 686         return err;
 687 }
 688
 689 static int spacc_aead_encrypt(struct aead_request *req)
 690 {
 691         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 692         struct spacc_aead *alg = to_spacc_aead(crypto_aead_alg(aead));
 693
 694         return spacc_aead_setup(req, alg->type, 1);
 695 }
 696
 697 static int spacc_aead_decrypt(struct aead_request *req)
 698 {
 699         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 700         struct spacc_aead  *alg = to_spacc_aead(crypto_aead_alg(aead));
 701
 702         return spacc_aead_setup(req, alg->type, 0);
 703 }
 704
 705 /*
 706  * Initialise a new AEAD context. This is responsible for allocating the
 707  * fallback cipher and initialising the context.
 708  */
 709 static int spacc_aead_cra_init(struct crypto_aead *tfm)
 710 {
 711         struct spacc_aead_ctx *ctx = crypto_aead_ctx(tfm);
 712         struct aead_alg *alg = crypto_aead_alg(tfm);
 713         struct spacc_aead *spacc_alg = to_spacc_aead(alg);
 714         struct spacc_engine *engine = spacc_alg->engine;
 715
 716         ctx->generic.flags = spacc_alg->type;
 717         ctx->generic.engine = engine;
 718         ctx->sw_cipher = crypto_alloc_aead(alg->base.cra_name, 0,
 719                                            CRYPTO_ALG_NEED_FALLBACK);
 720         if (IS_ERR(ctx->sw_cipher))
 721                 return PTR_ERR(ctx->sw_cipher);
 722         ctx->generic.key_offs = spacc_alg->key_offs;
 723         ctx->generic.iv_offs = spacc_alg->iv_offs;
 724
 725         crypto_aead_set_reqsize(
 726                 tfm,
 727                 max(sizeof(struct spacc_req),
 728                     sizeof(struct aead_request) +
 729                     crypto_aead_reqsize(ctx->sw_cipher)));
 730
 731         return 0;
 732 }
 733
 734 /*
 735  * Destructor for an AEAD context. This is called when the transform is freed
 736  * and must free the fallback cipher.
 737  */
 738 static void spacc_aead_cra_exit(struct crypto_aead *tfm)
 739 {
 740         struct spacc_aead_ctx *ctx = crypto_aead_ctx(tfm);
 741
 742         crypto_free_aead(ctx->sw_cipher);
 743 }
 744
 745 /*
 746  * Set the DES key for a block cipher transform. This also performs weak key
 747  * checking if the transform has requested it.
 748  */
 749 static int spacc_des_setkey(struct crypto_ablkcipher *cipher, const u8 *key,
 750                             unsigned int len)
 751 {
 752         struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
 753         struct spacc_ablk_ctx *ctx = crypto_tfm_ctx(tfm);
 754         u32 tmp[DES_EXPKEY_WORDS];
 755
 756         if (len > DES3_EDE_KEY_SIZE) {
 757                 crypto_ablkcipher_set_flags(cipher, CRYPTO_TFM_RES_BAD_KEY_LEN);
 758                 return -EINVAL;
 759         }
 760
 761         if (unlikely(!des_ekey(tmp, key)) &&
 762             (crypto_ablkcipher_get_flags(cipher) & CRYPTO_TFM_REQ_WEAK_KEY)) {
 763                 tfm->crt_flags |= CRYPTO_TFM_RES_WEAK_KEY;
 764                 return -EINVAL;
 765         }
 766
 767         memcpy(ctx->key, key, len);
 768         ctx->key_len = len;
 769
 770         return 0;
 771 }
 772
 773 /*
 774  * Set the key for an AES block cipher. Some key lengths are not supported in
 775  * hardware so this must also check whether a fallback is needed.
 776  */
 777 static int spacc_aes_setkey(struct crypto_ablkcipher *cipher, const u8 *key,
 778                             unsigned int len)
 779 {
 780         struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
 781         struct spacc_ablk_ctx *ctx = crypto_tfm_ctx(tfm);
 782         int err = 0;
 783
 784         if (len > AES_MAX_KEY_SIZE) {
 785                 crypto_ablkcipher_set_flags(cipher, CRYPTO_TFM_RES_BAD_KEY_LEN);
 786                 return -EINVAL;
 787         }
 788
 789         /*
 790          * IPSec engine only supports 128 and 256 bit AES keys. If we get a
 791          * request for any other size (192 bits) then we need to do a software
 792          * fallback.
 793          */
 794         if (len != AES_KEYSIZE_128 && len != AES_KEYSIZE_256) {
 795                 if (!ctx->sw_cipher)
 796                         return -EINVAL;
 797
 798                 /*
 799                  * Set the fallback transform to use the same request flags as
 800                  * the hardware transform.
 801                  */
 802                 crypto_skcipher_clear_flags(ctx->sw_cipher,
 803                                             CRYPTO_TFM_REQ_MASK);
 804                 crypto_skcipher_set_flags(ctx->sw_cipher,
 805                                           cipher->base.crt_flags &
 806                                           CRYPTO_TFM_REQ_MASK);
 807
 808                 err = crypto_skcipher_setkey(ctx->sw_cipher, key, len);
 809
 810                 tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
 811                 tfm->crt_flags |=
 812                         crypto_skcipher_get_flags(ctx->sw_cipher) &
 813                         CRYPTO_TFM_RES_MASK;
 814
 815                 if (err)
 816                         goto sw_setkey_failed;
 817         }
 818
 819         memcpy(ctx->key, key, len);
 820         ctx->key_len = len;
 821
 822 sw_setkey_failed:
 823         return err;
 824 }
 825
 826 static int spacc_kasumi_f8_setkey(struct crypto_ablkcipher *cipher,
 827                                   const u8 *key, unsigned int len)
 828 {
 829         struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
 830         struct spacc_ablk_ctx *ctx = crypto_tfm_ctx(tfm);
 831         int err = 0;
 832
 833         if (len > AES_MAX_KEY_SIZE) {
 834                 crypto_ablkcipher_set_flags(cipher, CRYPTO_TFM_RES_BAD_KEY_LEN);
 835                 err = -EINVAL;
 836                 goto out;
 837         }
 838
 839         memcpy(ctx->key, key, len);
 840         ctx->key_len = len;
 841
 842 out:
 843         return err;
 844 }
 845
 846 static int spacc_ablk_need_fallback(struct spacc_req *req)
 847 {
 848         struct spacc_ablk_ctx *ctx;
 849         struct crypto_tfm *tfm = req->req->tfm;
 850         struct crypto_alg *alg = req->req->tfm->__crt_alg;
 851         struct spacc_alg *spacc_alg = to_spacc_alg(alg);
 852
 853         ctx = crypto_tfm_ctx(tfm);
 854
 855         return (spacc_alg->ctrl_default & SPACC_CRYPTO_ALG_MASK) ==
 856                         SPA_CTRL_CIPH_ALG_AES &&
 857                         ctx->key_len != AES_KEYSIZE_128 &&
 858                         ctx->key_len != AES_KEYSIZE_256;
 859 }
 860
 861 static void spacc_ablk_complete(struct spacc_req *req)
 862 {
 863         struct ablkcipher_request *ablk_req = ablkcipher_request_cast(req->req);
 864
 865         if (ablk_req->src != ablk_req->dst) {
 866                 spacc_free_ddt(req, req->src_ddt, req->src_addr, ablk_req->src,
 867                                ablk_req->nbytes, DMA_TO_DEVICE);
 868                 spacc_free_ddt(req, req->dst_ddt, req->dst_addr, ablk_req->dst,
 869                                ablk_req->nbytes, DMA_FROM_DEVICE);
 870         } else
 871                 spacc_free_ddt(req, req->dst_ddt, req->dst_addr, ablk_req->dst,
 872                                ablk_req->nbytes, DMA_BIDIRECTIONAL);
 873
 874         req->req->complete(req->req, req->result);
 875 }
 876
 877 static int spacc_ablk_submit(struct spacc_req *req)
 878 {
 879         struct crypto_tfm *tfm = req->req->tfm;
 880         struct spacc_ablk_ctx *ctx = crypto_tfm_ctx(tfm);
 881         struct ablkcipher_request *ablk_req = ablkcipher_request_cast(req->req);
 882         struct crypto_alg *alg = req->req->tfm->__crt_alg;
 883         struct spacc_alg *spacc_alg = to_spacc_alg(alg);
 884         struct spacc_engine *engine = ctx->generic.engine;
 885         u32 ctrl;
 886
 887         req->ctx_id = spacc_load_ctx(&ctx->generic, ctx->key,
 888                 ctx->key_len, ablk_req->info, alg->cra_ablkcipher.ivsize,
 889                 NULL, 0);
 890
 891         writel(req->src_addr, engine->regs + SPA_SRC_PTR_REG_OFFSET);
 892         writel(req->dst_addr, engine->regs + SPA_DST_PTR_REG_OFFSET);
 893         writel(0, engine->regs + SPA_OFFSET_REG_OFFSET);
 894
 895         writel(ablk_req->nbytes, engine->regs + SPA_PROC_LEN_REG_OFFSET);
 896         writel(0, engine->regs + SPA_ICV_OFFSET_REG_OFFSET);
 897         writel(0, engine->regs + SPA_AUX_INFO_REG_OFFSET);
 898         writel(0, engine->regs + SPA_AAD_LEN_REG_OFFSET);
 899
 900         ctrl = spacc_alg->ctrl_default | (req->ctx_id << SPA_CTRL_CTX_IDX) |
 901                 (req->is_encrypt ? (1 << SPA_CTRL_ENCRYPT_IDX) :
 902                  (1 << SPA_CTRL_KEY_EXP));
 903
 904         mod_timer(&engine->packet_timeout, jiffies + PACKET_TIMEOUT);
 905
 906         writel(ctrl, engine->regs + SPA_CTRL_REG_OFFSET);
 907
 908         return -EINPROGRESS;
 909 }
 910
 911 static int spacc_ablk_do_fallback(struct ablkcipher_request *req,
 912                                   unsigned alg_type, bool is_encrypt)
 913 {
 914         struct crypto_tfm *old_tfm =
 915             crypto_ablkcipher_tfm(crypto_ablkcipher_reqtfm(req));
 916         struct spacc_ablk_ctx *ctx = crypto_tfm_ctx(old_tfm);
 917         SKCIPHER_REQUEST_ON_STACK(subreq, ctx->sw_cipher);
 918         int err;
 919
 920         /*
 921          * Change the request to use the software fallback transform, and once
 922          * the ciphering has completed, put the old transform back into the
 923          * request.
 924          */
 925         skcipher_request_set_tfm(subreq, ctx->sw_cipher);
 926         skcipher_request_set_callback(subreq, req->base.flags, NULL, NULL);
 927         skcipher_request_set_crypt(subreq, req->src, req->dst,
 928                                    req->nbytes, req->info);
 929         err = is_encrypt ? crypto_skcipher_encrypt(subreq) :
 930                            crypto_skcipher_decrypt(subreq);
 931         skcipher_request_zero(subreq);
 932
 933         return err;
 934 }
 935
 936 static int spacc_ablk_setup(struct ablkcipher_request *req, unsigned alg_type,
 937                             bool is_encrypt)
 938 {
 939         struct crypto_alg *alg = req->base.tfm->__crt_alg;
 940         struct spacc_engine *engine = to_spacc_alg(alg)->engine;
 941         struct spacc_req *dev_req = ablkcipher_request_ctx(req);
 942         unsigned long flags;
 943         int err = -ENOMEM;
 944
 945         dev_req->req            = &req->base;
 946         dev_req->is_encrypt     = is_encrypt;
 947         dev_req->engine         = engine;
 948         dev_req->complete       = spacc_ablk_complete;
 949         dev_req->result         = -EINPROGRESS;
 950
 951         if (unlikely(spacc_ablk_need_fallback(dev_req)))
 952                 return spacc_ablk_do_fallback(req, alg_type, is_encrypt);
 953
 954         /*
 955          * Create the DDT's for the engine. If we share the same source and
 956          * destination then we can optimize by reusing the DDT's.
 957          */
 958         if (req->src != req->dst) {
 959                 dev_req->src_ddt = spacc_sg_to_ddt(engine, req->src,
 960                         req->nbytes, DMA_TO_DEVICE, &dev_req->src_addr);
 961                 if (!dev_req->src_ddt)
 962                         goto out;
 963
 964                 dev_req->dst_ddt = spacc_sg_to_ddt(engine, req->dst,
 965                         req->nbytes, DMA_FROM_DEVICE, &dev_req->dst_addr);
 966                 if (!dev_req->dst_ddt)
 967                         goto out_free_src;
 968         } else {
 969                 dev_req->dst_ddt = spacc_sg_to_ddt(engine, req->dst,
 970                         req->nbytes, DMA_BIDIRECTIONAL, &dev_req->dst_addr);
 971                 if (!dev_req->dst_ddt)
 972                         goto out;
 973
 974                 dev_req->src_ddt = NULL;
 975                 dev_req->src_addr = dev_req->dst_addr;
 976         }
 977
 978         err = -EINPROGRESS;
 979         spin_lock_irqsave(&engine->hw_lock, flags);
 980         /*
 981          * Check if the engine will accept the operation now. If it won't then
 982          * we either stick it on the end of a pending list if we can backlog,
 983          * or bailout with an error if not.
 984          */
 985         if (unlikely(spacc_fifo_cmd_full(engine)) ||
 986             engine->in_flight + 1 > engine->fifo_sz) {
 987                 if (!(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
 988                         err = -EBUSY;
 989                         spin_unlock_irqrestore(&engine->hw_lock, flags);
 990                         goto out_free_ddts;
 991                 }
 992                 list_add_tail(&dev_req->list, &engine->pending);
 993         } else {
 994                 list_add_tail(&dev_req->list, &engine->pending);
 995                 spacc_push(engine);
 996         }
 997         spin_unlock_irqrestore(&engine->hw_lock, flags);
 998
 999         goto out;
1000
1001 out_free_ddts:
1002         spacc_free_ddt(dev_req, dev_req->dst_ddt, dev_req->dst_addr, req->dst,
1003                        req->nbytes, req->src == req->dst ?
1004                        DMA_BIDIRECTIONAL : DMA_FROM_DEVICE);
1005 out_free_src:
1006         if (req->src != req->dst)
1007                 spacc_free_ddt(dev_req, dev_req->src_ddt, dev_req->src_addr,
1008                                req->src, req->nbytes, DMA_TO_DEVICE);
1009 out:
1010         return err;
1011 }
1012
1013 static int spacc_ablk_cra_init(struct crypto_tfm *tfm)
1014 {
1015         struct spacc_ablk_ctx *ctx = crypto_tfm_ctx(tfm);
1016         struct crypto_alg *alg = tfm->__crt_alg;
1017         struct spacc_alg *spacc_alg = to_spacc_alg(alg);
1018         struct spacc_engine *engine = spacc_alg->engine;
1019
1020         ctx->generic.flags = spacc_alg->type;
1021         ctx->generic.engine = engine;
1022         if (alg->cra_flags & CRYPTO_ALG_NEED_FALLBACK) {
1023                 ctx->sw_cipher = crypto_alloc_skcipher(
1024                         alg->cra_name, 0, CRYPTO_ALG_ASYNC |
1025                                           CRYPTO_ALG_NEED_FALLBACK);
1026                 if (IS_ERR(ctx->sw_cipher)) {
1027                         dev_warn(engine->dev, "failed to allocate fallback for %s\n",
1028                                  alg->cra_name);
1029                         return PTR_ERR(ctx->sw_cipher);
1030                 }
1031         }
1032         ctx->generic.key_offs = spacc_alg->key_offs;
1033         ctx->generic.iv_offs = spacc_alg->iv_offs;
1034
1035         tfm->crt_ablkcipher.reqsize = sizeof(struct spacc_req);
1036
1037         return 0;
1038 }
1039
1040 static void spacc_ablk_cra_exit(struct crypto_tfm *tfm)
1041 {
1042         struct spacc_ablk_ctx *ctx = crypto_tfm_ctx(tfm);
1043
1044         crypto_free_skcipher(ctx->sw_cipher);
1045 }
1046
1047 static int spacc_ablk_encrypt(struct ablkcipher_request *req)
1048 {
1049         struct crypto_ablkcipher *cipher = crypto_ablkcipher_reqtfm(req);
1050         struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
1051         struct spacc_alg *alg = to_spacc_alg(tfm->__crt_alg);
1052
1053         return spacc_ablk_setup(req, alg->type, 1);
1054 }
1055
1056 static int spacc_ablk_decrypt(struct ablkcipher_request *req)
1057 {
1058         struct crypto_ablkcipher *cipher = crypto_ablkcipher_reqtfm(req);
1059         struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
1060         struct spacc_alg *alg = to_spacc_alg(tfm->__crt_alg);
1061
1062         return spacc_ablk_setup(req, alg->type, 0);
1063 }
1064
1065 static inline int spacc_fifo_stat_empty(struct spacc_engine *engine)
1066 {
1067         return readl(engine->regs + SPA_FIFO_STAT_REG_OFFSET) &
1068                 SPA_FIFO_STAT_EMPTY;
1069 }
1070
1071 static void spacc_process_done(struct spacc_engine *engine)
1072 {
1073         struct spacc_req *req;
1074         unsigned long flags;
1075
1076         spin_lock_irqsave(&engine->hw_lock, flags);
1077
1078         while (!spacc_fifo_stat_empty(engine)) {
1079                 req = list_first_entry(&engine->in_progress, struct spacc_req,
1080                                        list);
1081                 list_move_tail(&req->list, &engine->completed);
1082                 --engine->in_flight;
1083
1084                 /* POP the status register. */
1085                 writel(~0, engine->regs + SPA_STAT_POP_REG_OFFSET);
1086                 req->result = (readl(engine->regs + SPA_STATUS_REG_OFFSET) &
1087                      SPA_STATUS_RES_CODE_MASK) >> SPA_STATUS_RES_CODE_OFFSET;
1088
1089                 /*
1090                  * Convert the SPAcc error status into the standard POSIX error
1091                  * codes.
1092                  */
1093                 if (unlikely(req->result)) {
1094                         switch (req->result) {
1095                         case SPA_STATUS_ICV_FAIL:
1096                                 req->result = -EBADMSG;
1097                                 break;
1098
1099                         case SPA_STATUS_MEMORY_ERROR:
1100                                 dev_warn(engine->dev,
1101                                          "memory error triggered\n");
1102                                 req->result = -EFAULT;
1103                                 break;
1104
1105                         case SPA_STATUS_BLOCK_ERROR:
1106                                 dev_warn(engine->dev,
1107                                          "block error triggered\n");
1108                                 req->result = -EIO;
1109                                 break;
1110                         }
1111                 }
1112         }
1113
1114         tasklet_schedule(&engine->complete);
1115
1116         spin_unlock_irqrestore(&engine->hw_lock, flags);
1117 }
1118
1119 static irqreturn_t spacc_spacc_irq(int irq, void *dev)
1120 {
1121         struct spacc_engine *engine = (struct spacc_engine *)dev;
1122         u32 spacc_irq_stat = readl(engine->regs + SPA_IRQ_STAT_REG_OFFSET);
1123
1124         writel(spacc_irq_stat, engine->regs + SPA_IRQ_STAT_REG_OFFSET);
1125         spacc_process_done(engine);
1126
1127         return IRQ_HANDLED;
1128 }
1129
1130 static void spacc_packet_timeout(struct timer_list *t)
1131 {
1132         struct spacc_engine *engine = from_timer(engine, t, packet_timeout);
1133
1134         spacc_process_done(engine);
1135 }
1136
1137 static int spacc_req_submit(struct spacc_req *req)
1138 {
1139         struct crypto_alg *alg = req->req->tfm->__crt_alg;
1140
1141         if (CRYPTO_ALG_TYPE_AEAD == (CRYPTO_ALG_TYPE_MASK & alg->cra_flags))
1142                 return spacc_aead_submit(req);
1143         else
1144                 return spacc_ablk_submit(req);
1145 }
1146
1147 static void spacc_spacc_complete(unsigned long data)
1148 {
1149         struct spacc_engine *engine = (struct spacc_engine *)data;
1150         struct spacc_req *req, *tmp;
1151         unsigned long flags;
1152         LIST_HEAD(completed);
1153
1154         spin_lock_irqsave(&engine->hw_lock, flags);
1155
1156         list_splice_init(&engine->completed, &completed);
1157         spacc_push(engine);
1158         if (engine->in_flight)
1159                 mod_timer(&engine->packet_timeout, jiffies + PACKET_TIMEOUT);
1160
1161         spin_unlock_irqrestore(&engine->hw_lock, flags);
1162
1163         list_for_each_entry_safe(req, tmp, &completed, list) {
1164                 list_del(&req->list);
1165                 req->complete(req);
1166         }
1167 }
1168
1169 #ifdef CONFIG_PM
1170 static int spacc_suspend(struct device *dev)
1171 {
1172         struct spacc_engine *engine = dev_get_drvdata(dev);
1173
1174         /*
1175          * We only support standby mode. All we have to do is gate the clock to
1176          * the spacc. The hardware will preserve state until we turn it back
1177          * on again.
1178          */
1179         clk_disable(engine->clk);
1180
1181         return 0;
1182 }
1183
1184 static int spacc_resume(struct device *dev)
1185 {
1186         struct spacc_engine *engine = dev_get_drvdata(dev);
1187
1188         return clk_enable(engine->clk);
1189 }
1190
1191 static const struct dev_pm_ops spacc_pm_ops = {
1192         .suspend        = spacc_suspend,
1193         .resume         = spacc_resume,
1194 };
1195 #endif /* CONFIG_PM */
1196
1197 static inline struct spacc_engine *spacc_dev_to_engine(struct device *dev)
1198 {
1199         return dev ? platform_get_drvdata(to_platform_device(dev)) : NULL;
1200 }
1201
1202 static ssize_t spacc_stat_irq_thresh_show(struct device *dev,
1203                                           struct device_attribute *attr,
1204                                           char *buf)
1205 {
1206         struct spacc_engine *engine = spacc_dev_to_engine(dev);
1207
1208         return snprintf(buf, PAGE_SIZE, "%u\n", engine->stat_irq_thresh);
1209 }
1210
1211 static ssize_t spacc_stat_irq_thresh_store(struct device *dev,
1212                                            struct device_attribute *attr,
1213                                            const char *buf, size_t len)
1214 {
1215         struct spacc_engine *engine = spacc_dev_to_engine(dev);
1216         unsigned long thresh;
1217
1218         if (kstrtoul(buf, 0, &thresh))
1219                 return -EINVAL;
1220
1221         thresh = clamp(thresh, 1UL, engine->fifo_sz - 1);
1222
1223         engine->stat_irq_thresh = thresh;
1224         writel(engine->stat_irq_thresh << SPA_IRQ_CTRL_STAT_CNT_OFFSET,
1225                engine->regs + SPA_IRQ_CTRL_REG_OFFSET);
1226
1227         return len;
1228 }
1229 static DEVICE_ATTR(stat_irq_thresh, 0644, spacc_stat_irq_thresh_show,
1230                    spacc_stat_irq_thresh_store);
1231
1232 static struct spacc_alg ipsec_engine_algs[] = {
1233         {
1234                 .ctrl_default = SPA_CTRL_CIPH_ALG_AES | SPA_CTRL_CIPH_MODE_CBC,
1235                 .key_offs = 0,
1236                 .iv_offs = AES_MAX_KEY_SIZE,
1237                 .alg = {
1238                         .cra_name = "cbc(aes)",
1239                         .cra_driver_name = "cbc-aes-picoxcell",
1240                         .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1241                         .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
1242                                      CRYPTO_ALG_KERN_DRIVER_ONLY |
1243                                      CRYPTO_ALG_ASYNC |
1244                                      CRYPTO_ALG_NEED_FALLBACK,
1245                         .cra_blocksize = AES_BLOCK_SIZE,
1246                         .cra_ctxsize = sizeof(struct spacc_ablk_ctx),
1247                         .cra_type = &crypto_ablkcipher_type,
1248                         .cra_module = THIS_MODULE,
1249                         .cra_ablkcipher = {
1250                                 .setkey = spacc_aes_setkey,
1251                                 .encrypt = spacc_ablk_encrypt,
1252                                 .decrypt = spacc_ablk_decrypt,
1253                                 .min_keysize = AES_MIN_KEY_SIZE,
1254                                 .max_keysize = AES_MAX_KEY_SIZE,
1255                                 .ivsize = AES_BLOCK_SIZE,
1256                         },
1257                         .cra_init = spacc_ablk_cra_init,
1258                         .cra_exit = spacc_ablk_cra_exit,
1259                 },
1260         },
1261         {
1262                 .key_offs = 0,
1263                 .iv_offs = AES_MAX_KEY_SIZE,
1264                 .ctrl_default = SPA_CTRL_CIPH_ALG_AES | SPA_CTRL_CIPH_MODE_ECB,
1265                 .alg = {
1266                         .cra_name = "ecb(aes)",
1267                         .cra_driver_name = "ecb-aes-picoxcell",
1268                         .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1269                         .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
1270                                 CRYPTO_ALG_KERN_DRIVER_ONLY |
1271                                 CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK,
1272                         .cra_blocksize = AES_BLOCK_SIZE,
1273                         .cra_ctxsize = sizeof(struct spacc_ablk_ctx),
1274                         .cra_type = &crypto_ablkcipher_type,
1275                         .cra_module = THIS_MODULE,
1276                         .cra_ablkcipher = {
1277                                 .setkey = spacc_aes_setkey,
1278                                 .encrypt = spacc_ablk_encrypt,
1279                                 .decrypt = spacc_ablk_decrypt,
1280                                 .min_keysize = AES_MIN_KEY_SIZE,
1281                                 .max_keysize = AES_MAX_KEY_SIZE,
1282                         },
1283                         .cra_init = spacc_ablk_cra_init,
1284                         .cra_exit = spacc_ablk_cra_exit,
1285                 },
1286         },
1287         {
1288                 .key_offs = DES_BLOCK_SIZE,
1289                 .iv_offs = 0,
1290                 .ctrl_default = SPA_CTRL_CIPH_ALG_DES | SPA_CTRL_CIPH_MODE_CBC,
1291                 .alg = {
1292                         .cra_name = "cbc(des)",
1293                         .cra_driver_name = "cbc-des-picoxcell",
1294                         .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1295                         .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
1296                                         CRYPTO_ALG_ASYNC |
1297                                         CRYPTO_ALG_KERN_DRIVER_ONLY,
1298                         .cra_blocksize = DES_BLOCK_SIZE,
1299                         .cra_ctxsize = sizeof(struct spacc_ablk_ctx),
1300                         .cra_type = &crypto_ablkcipher_type,
1301                         .cra_module = THIS_MODULE,
1302                         .cra_ablkcipher = {
1303                                 .setkey = spacc_des_setkey,
1304                                 .encrypt = spacc_ablk_encrypt,
1305                                 .decrypt = spacc_ablk_decrypt,
1306                                 .min_keysize = DES_KEY_SIZE,
1307                                 .max_keysize = DES_KEY_SIZE,
1308                                 .ivsize = DES_BLOCK_SIZE,
1309                         },
1310                         .cra_init = spacc_ablk_cra_init,
1311                         .cra_exit = spacc_ablk_cra_exit,
1312                 },
1313         },
1314         {
1315                 .key_offs = DES_BLOCK_SIZE,
1316                 .iv_offs = 0,
1317                 .ctrl_default = SPA_CTRL_CIPH_ALG_DES | SPA_CTRL_CIPH_MODE_ECB,
1318                 .alg = {
1319                         .cra_name = "ecb(des)",
1320                         .cra_driver_name = "ecb-des-picoxcell",
1321                         .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1322                         .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
1323                                         CRYPTO_ALG_ASYNC |
1324                                         CRYPTO_ALG_KERN_DRIVER_ONLY,
1325                         .cra_blocksize = DES_BLOCK_SIZE,
1326                         .cra_ctxsize = sizeof(struct spacc_ablk_ctx),
1327                         .cra_type = &crypto_ablkcipher_type,
1328                         .cra_module = THIS_MODULE,
1329                         .cra_ablkcipher = {
1330                                 .setkey = spacc_des_setkey,
1331                                 .encrypt = spacc_ablk_encrypt,
1332                                 .decrypt = spacc_ablk_decrypt,
1333                                 .min_keysize = DES_KEY_SIZE,
1334                                 .max_keysize = DES_KEY_SIZE,
1335                         },
1336                         .cra_init = spacc_ablk_cra_init,
1337                         .cra_exit = spacc_ablk_cra_exit,
1338                 },
1339         },
1340         {
1341                 .key_offs = DES_BLOCK_SIZE,
1342                 .iv_offs = 0,
1343                 .ctrl_default = SPA_CTRL_CIPH_ALG_DES | SPA_CTRL_CIPH_MODE_CBC,
1344                 .alg = {
1345                         .cra_name = "cbc(des3_ede)",
1346                         .cra_driver_name = "cbc-des3-ede-picoxcell",
1347                         .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1348                         .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
1349                                         CRYPTO_ALG_ASYNC |
1350                                         CRYPTO_ALG_KERN_DRIVER_ONLY,
1351                         .cra_blocksize = DES3_EDE_BLOCK_SIZE,
1352                         .cra_ctxsize = sizeof(struct spacc_ablk_ctx),
1353                         .cra_type = &crypto_ablkcipher_type,
1354                         .cra_module = THIS_MODULE,
1355                         .cra_ablkcipher = {
1356                                 .setkey = spacc_des_setkey,
1357                                 .encrypt = spacc_ablk_encrypt,
1358                                 .decrypt = spacc_ablk_decrypt,
1359                                 .min_keysize = DES3_EDE_KEY_SIZE,
1360                                 .max_keysize = DES3_EDE_KEY_SIZE,
1361                                 .ivsize = DES3_EDE_BLOCK_SIZE,
1362                         },
1363                         .cra_init = spacc_ablk_cra_init,
1364                         .cra_exit = spacc_ablk_cra_exit,
1365                 },
1366         },
1367         {
1368                 .key_offs = DES_BLOCK_SIZE,
1369                 .iv_offs = 0,
1370                 .ctrl_default = SPA_CTRL_CIPH_ALG_DES | SPA_CTRL_CIPH_MODE_ECB,
1371                 .alg = {
1372                         .cra_name = "ecb(des3_ede)",
1373                         .cra_driver_name = "ecb-des3-ede-picoxcell",
1374                         .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1375                         .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
1376                                         CRYPTO_ALG_ASYNC |
1377                                         CRYPTO_ALG_KERN_DRIVER_ONLY,
1378                         .cra_blocksize = DES3_EDE_BLOCK_SIZE,
1379                         .cra_ctxsize = sizeof(struct spacc_ablk_ctx),
1380                         .cra_type = &crypto_ablkcipher_type,
1381                         .cra_module = THIS_MODULE,
1382                         .cra_ablkcipher = {
1383                                 .setkey = spacc_des_setkey,
1384                                 .encrypt = spacc_ablk_encrypt,
1385                                 .decrypt = spacc_ablk_decrypt,
1386                                 .min_keysize = DES3_EDE_KEY_SIZE,
1387                                 .max_keysize = DES3_EDE_KEY_SIZE,
1388                         },
1389                         .cra_init = spacc_ablk_cra_init,
1390                         .cra_exit = spacc_ablk_cra_exit,
1391                 },
1392         },
1393 };
1394
1395 static struct spacc_aead ipsec_engine_aeads[] = {
1396         {
1397                 .ctrl_default = SPA_CTRL_CIPH_ALG_AES |
1398                                 SPA_CTRL_CIPH_MODE_CBC |
1399                                 SPA_CTRL_HASH_ALG_SHA |
1400                                 SPA_CTRL_HASH_MODE_HMAC,
1401                 .key_offs = 0,
1402                 .iv_offs = AES_MAX_KEY_SIZE,
1403                 .alg = {
1404                         .base = {
1405                                 .cra_name = "authenc(hmac(sha1),cbc(aes))",
1406                                 .cra_driver_name = "authenc-hmac-sha1-"
1407                                                    "cbc-aes-picoxcell",
1408                                 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1409                                 .cra_flags = CRYPTO_ALG_ASYNC |
1410                                              CRYPTO_ALG_NEED_FALLBACK |
1411                                              CRYPTO_ALG_KERN_DRIVER_ONLY,
1412                                 .cra_blocksize = AES_BLOCK_SIZE,
1413                                 .cra_ctxsize = sizeof(struct spacc_aead_ctx),
1414                                 .cra_module = THIS_MODULE,
1415                         },
1416                         .setkey = spacc_aead_setkey,
1417                         .setauthsize = spacc_aead_setauthsize,
1418                         .encrypt = spacc_aead_encrypt,
1419                         .decrypt = spacc_aead_decrypt,
1420                         .ivsize = AES_BLOCK_SIZE,
1421                         .maxauthsize = SHA1_DIGEST_SIZE,
1422                         .init = spacc_aead_cra_init,
1423                         .exit = spacc_aead_cra_exit,
1424                 },
1425         },
1426         {
1427                 .ctrl_default = SPA_CTRL_CIPH_ALG_AES |
1428                                 SPA_CTRL_CIPH_MODE_CBC |
1429                                 SPA_CTRL_HASH_ALG_SHA256 |
1430                                 SPA_CTRL_HASH_MODE_HMAC,
1431                 .key_offs = 0,
1432                 .iv_offs = AES_MAX_KEY_SIZE,
1433                 .alg = {
1434                         .base = {
1435                                 .cra_name = "authenc(hmac(sha256),cbc(aes))",
1436                                 .cra_driver_name = "authenc-hmac-sha256-"
1437                                                    "cbc-aes-picoxcell",
1438                                 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1439                                 .cra_flags = CRYPTO_ALG_ASYNC |
1440                                              CRYPTO_ALG_NEED_FALLBACK |
1441                                              CRYPTO_ALG_KERN_DRIVER_ONLY,
1442                                 .cra_blocksize = AES_BLOCK_SIZE,
1443                                 .cra_ctxsize = sizeof(struct spacc_aead_ctx),
1444                                 .cra_module = THIS_MODULE,
1445                         },
1446                         .setkey = spacc_aead_setkey,
1447                         .setauthsize = spacc_aead_setauthsize,
1448                         .encrypt = spacc_aead_encrypt,
1449                         .decrypt = spacc_aead_decrypt,
1450                         .ivsize = AES_BLOCK_SIZE,
1451                         .maxauthsize = SHA256_DIGEST_SIZE,
1452                         .init = spacc_aead_cra_init,
1453                         .exit = spacc_aead_cra_exit,
1454                 },
1455         },
1456         {
1457                 .key_offs = 0,
1458                 .iv_offs = AES_MAX_KEY_SIZE,
1459                 .ctrl_default = SPA_CTRL_CIPH_ALG_AES |
1460                                 SPA_CTRL_CIPH_MODE_CBC |
1461                                 SPA_CTRL_HASH_ALG_MD5 |
1462                                 SPA_CTRL_HASH_MODE_HMAC,
1463                 .alg = {
1464                         .base = {
1465                                 .cra_name = "authenc(hmac(md5),cbc(aes))",
1466                                 .cra_driver_name = "authenc-hmac-md5-"
1467                                                    "cbc-aes-picoxcell",
1468                                 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1469                                 .cra_flags = CRYPTO_ALG_ASYNC |
1470                                              CRYPTO_ALG_NEED_FALLBACK |
1471                                              CRYPTO_ALG_KERN_DRIVER_ONLY,
1472                                 .cra_blocksize = AES_BLOCK_SIZE,
1473                                 .cra_ctxsize = sizeof(struct spacc_aead_ctx),
1474                                 .cra_module = THIS_MODULE,
1475                         },
1476                         .setkey = spacc_aead_setkey,
1477                         .setauthsize = spacc_aead_setauthsize,
1478                         .encrypt = spacc_aead_encrypt,
1479                         .decrypt = spacc_aead_decrypt,
1480                         .ivsize = AES_BLOCK_SIZE,
1481                         .maxauthsize = MD5_DIGEST_SIZE,
1482                         .init = spacc_aead_cra_init,
1483                         .exit = spacc_aead_cra_exit,
1484                 },
1485         },
1486         {
1487                 .key_offs = DES_BLOCK_SIZE,
1488                 .iv_offs = 0,
1489                 .ctrl_default = SPA_CTRL_CIPH_ALG_DES |
1490                                 SPA_CTRL_CIPH_MODE_CBC |
1491                                 SPA_CTRL_HASH_ALG_SHA |
1492                                 SPA_CTRL_HASH_MODE_HMAC,
1493                 .alg = {
1494                         .base = {
1495                                 .cra_name = "authenc(hmac(sha1),cbc(des3_ede))",
1496                                 .cra_driver_name = "authenc-hmac-sha1-"
1497                                                    "cbc-3des-picoxcell",
1498                                 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1499                                 .cra_flags = CRYPTO_ALG_ASYNC |
1500                                              CRYPTO_ALG_NEED_FALLBACK |
1501                                              CRYPTO_ALG_KERN_DRIVER_ONLY,
1502                                 .cra_blocksize = DES3_EDE_BLOCK_SIZE,
1503                                 .cra_ctxsize = sizeof(struct spacc_aead_ctx),
1504                                 .cra_module = THIS_MODULE,
1505                         },
1506                         .setkey = spacc_aead_setkey,
1507                         .setauthsize = spacc_aead_setauthsize,
1508                         .encrypt = spacc_aead_encrypt,
1509                         .decrypt = spacc_aead_decrypt,
1510                         .ivsize = DES3_EDE_BLOCK_SIZE,
1511                         .maxauthsize = SHA1_DIGEST_SIZE,
1512                         .init = spacc_aead_cra_init,
1513                         .exit = spacc_aead_cra_exit,
1514                 },
1515         },
1516         {
1517                 .key_offs = DES_BLOCK_SIZE,
1518                 .iv_offs = 0,
1519                 .ctrl_default = SPA_CTRL_CIPH_ALG_AES |
1520                                 SPA_CTRL_CIPH_MODE_CBC |
1521                                 SPA_CTRL_HASH_ALG_SHA256 |
1522                                 SPA_CTRL_HASH_MODE_HMAC,
1523                 .alg = {
1524                         .base = {
1525                                 .cra_name = "authenc(hmac(sha256),"
1526                                             "cbc(des3_ede))",
1527                                 .cra_driver_name = "authenc-hmac-sha256-"
1528                                                    "cbc-3des-picoxcell",
1529                                 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1530                                 .cra_flags = CRYPTO_ALG_ASYNC |
1531                                              CRYPTO_ALG_NEED_FALLBACK |
1532                                              CRYPTO_ALG_KERN_DRIVER_ONLY,
1533                                 .cra_blocksize = DES3_EDE_BLOCK_SIZE,
1534                                 .cra_ctxsize = sizeof(struct spacc_aead_ctx),
1535                                 .cra_module = THIS_MODULE,
1536                         },
1537                         .setkey = spacc_aead_setkey,
1538                         .setauthsize = spacc_aead_setauthsize,
1539                         .encrypt = spacc_aead_encrypt,
1540                         .decrypt = spacc_aead_decrypt,
1541                         .ivsize = DES3_EDE_BLOCK_SIZE,
1542                         .maxauthsize = SHA256_DIGEST_SIZE,
1543                         .init = spacc_aead_cra_init,
1544                         .exit = spacc_aead_cra_exit,
1545                 },
1546         },
1547         {
1548                 .key_offs = DES_BLOCK_SIZE,
1549                 .iv_offs = 0,
1550                 .ctrl_default = SPA_CTRL_CIPH_ALG_DES |
1551                                 SPA_CTRL_CIPH_MODE_CBC |
1552                                 SPA_CTRL_HASH_ALG_MD5 |
1553                                 SPA_CTRL_HASH_MODE_HMAC,
1554                 .alg = {
1555                         .base = {
1556                                 .cra_name = "authenc(hmac(md5),cbc(des3_ede))",
1557                                 .cra_driver_name = "authenc-hmac-md5-"
1558                                                    "cbc-3des-picoxcell",
1559                                 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1560                                 .cra_flags = CRYPTO_ALG_ASYNC |
1561                                              CRYPTO_ALG_NEED_FALLBACK |
1562                                              CRYPTO_ALG_KERN_DRIVER_ONLY,
1563                                 .cra_blocksize = DES3_EDE_BLOCK_SIZE,
1564                                 .cra_ctxsize = sizeof(struct spacc_aead_ctx),
1565                                 .cra_module = THIS_MODULE,
1566                         },
1567                         .setkey = spacc_aead_setkey,
1568                         .setauthsize = spacc_aead_setauthsize,
1569                         .encrypt = spacc_aead_encrypt,
1570                         .decrypt = spacc_aead_decrypt,
1571                         .ivsize = DES3_EDE_BLOCK_SIZE,
1572                         .maxauthsize = MD5_DIGEST_SIZE,
1573                         .init = spacc_aead_cra_init,
1574                         .exit = spacc_aead_cra_exit,
1575                 },
1576         },
1577 };
1578
1579 static struct spacc_alg l2_engine_algs[] = {
1580         {
1581                 .key_offs = 0,
1582                 .iv_offs = SPACC_CRYPTO_KASUMI_F8_KEY_LEN,
1583                 .ctrl_default = SPA_CTRL_CIPH_ALG_KASUMI |
1584                                 SPA_CTRL_CIPH_MODE_F8,
1585                 .alg = {
1586                         .cra_name = "f8(kasumi)",
1587                         .cra_driver_name = "f8-kasumi-picoxcell",
1588                         .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1589                         .cra_flags = CRYPTO_ALG_TYPE_GIVCIPHER |
1590                                         CRYPTO_ALG_ASYNC |
1591                                         CRYPTO_ALG_KERN_DRIVER_ONLY,
1592                         .cra_blocksize = 8,
1593                         .cra_ctxsize = sizeof(struct spacc_ablk_ctx),
1594                         .cra_type = &crypto_ablkcipher_type,
1595                         .cra_module = THIS_MODULE,
1596                         .cra_ablkcipher = {
1597                                 .setkey = spacc_kasumi_f8_setkey,
1598                                 .encrypt = spacc_ablk_encrypt,
1599                                 .decrypt = spacc_ablk_decrypt,
1600                                 .min_keysize = 16,
1601                                 .max_keysize = 16,
1602                                 .ivsize = 8,
1603                         },
1604                         .cra_init = spacc_ablk_cra_init,
1605                         .cra_exit = spacc_ablk_cra_exit,
1606                 },
1607         },
1608 };
1609
1610 #ifdef CONFIG_OF
1611 static const struct of_device_id spacc_of_id_table[] = {
1612         { .compatible = "picochip,spacc-ipsec" },
1613         { .compatible = "picochip,spacc-l2" },
1614         {}
1615 };
1616 MODULE_DEVICE_TABLE(of, spacc_of_id_table);
1617 #endif /* CONFIG_OF */
1618
1619 static int spacc_probe(struct platform_device *pdev)
1620 {
1621         int i, err, ret;
1622         struct resource *mem, *irq;
1623         struct device_node *np = pdev->dev.of_node;
1624         struct spacc_engine *engine = devm_kzalloc(&pdev->dev, sizeof(*engine),
1625                                                    GFP_KERNEL);
1626         if (!engine)
1627                 return -ENOMEM;
1628
1629         if (of_device_is_compatible(np, "picochip,spacc-ipsec")) {
1630                 engine->max_ctxs        = SPACC_CRYPTO_IPSEC_MAX_CTXS;
1631                 engine->cipher_pg_sz    = SPACC_CRYPTO_IPSEC_CIPHER_PG_SZ;
1632                 engine->hash_pg_sz      = SPACC_CRYPTO_IPSEC_HASH_PG_SZ;
1633                 engine->fifo_sz         = SPACC_CRYPTO_IPSEC_FIFO_SZ;
1634                 engine->algs            = ipsec_engine_algs;
1635                 engine->num_algs        = ARRAY_SIZE(ipsec_engine_algs);
1636                 engine->aeads           = ipsec_engine_aeads;
1637                 engine->num_aeads       = ARRAY_SIZE(ipsec_engine_aeads);
1638         } else if (of_device_is_compatible(np, "picochip,spacc-l2")) {
1639                 engine->max_ctxs        = SPACC_CRYPTO_L2_MAX_CTXS;
1640                 engine->cipher_pg_sz    = SPACC_CRYPTO_L2_CIPHER_PG_SZ;
1641                 engine->hash_pg_sz      = SPACC_CRYPTO_L2_HASH_PG_SZ;
1642                 engine->fifo_sz         = SPACC_CRYPTO_L2_FIFO_SZ;
1643                 engine->algs            = l2_engine_algs;
1644                 engine->num_algs        = ARRAY_SIZE(l2_engine_algs);
1645         } else {
1646                 return -EINVAL;
1647         }
1648
1649         engine->name = dev_name(&pdev->dev);
1650
1651         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1652         engine->regs = devm_ioremap_resource(&pdev->dev, mem);
1653         if (IS_ERR(engine->regs))
1654                 return PTR_ERR(engine->regs);
1655
1656         irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1657         if (!irq) {
1658                 dev_err(&pdev->dev, "no memory/irq resource for engine\n");
1659                 return -ENXIO;
1660         }
1661
1662         if (devm_request_irq(&pdev->dev, irq->start, spacc_spacc_irq, 0,
1663                              engine->name, engine)) {
1664                 dev_err(engine->dev, "failed to request IRQ\n");
1665                 return -EBUSY;
1666         }
1667
1668         engine->dev             = &pdev->dev;
1669         engine->cipher_ctx_base = engine->regs + SPA_CIPH_KEY_BASE_REG_OFFSET;
1670         engine->hash_key_base   = engine->regs + SPA_HASH_KEY_BASE_REG_OFFSET;
1671
1672         engine->req_pool = dmam_pool_create(engine->name, engine->dev,
1673                 MAX_DDT_LEN * sizeof(struct spacc_ddt), 8, SZ_64K);
1674         if (!engine->req_pool)
1675                 return -ENOMEM;
1676
1677         spin_lock_init(&engine->hw_lock);
1678
1679         engine->clk = clk_get(&pdev->dev, "ref");
1680         if (IS_ERR(engine->clk)) {
1681                 dev_info(&pdev->dev, "clk unavailable\n");
1682                 return PTR_ERR(engine->clk);
1683         }
1684
1685         if (clk_prepare_enable(engine->clk)) {
1686                 dev_info(&pdev->dev, "unable to prepare/enable clk\n");
1687                 ret = -EIO;
1688                 goto err_clk_put;
1689         }
1690
1691         ret = device_create_file(&pdev->dev, &dev_attr_stat_irq_thresh);
1692         if (ret)
1693                 goto err_clk_disable;
1694
1695
1696         /*
1697          * Use an IRQ threshold of 50% as a default. This seems to be a
1698          * reasonable trade off of latency against throughput but can be
1699          * changed at runtime.
1700          */
1701         engine->stat_irq_thresh = (engine->fifo_sz / 2);
1702
1703         /*
1704          * Configure the interrupts. We only use the STAT_CNT interrupt as we
1705          * only submit a new packet for processing when we complete another in
1706          * the queue. This minimizes time spent in the interrupt handler.
1707          */
1708         writel(engine->stat_irq_thresh << SPA_IRQ_CTRL_STAT_CNT_OFFSET,
1709                engine->regs + SPA_IRQ_CTRL_REG_OFFSET);
1710         writel(SPA_IRQ_EN_STAT_EN | SPA_IRQ_EN_GLBL_EN,
1711                engine->regs + SPA_IRQ_EN_REG_OFFSET);
1712
1713         timer_setup(&engine->packet_timeout, spacc_packet_timeout, 0);
1714
1715         INIT_LIST_HEAD(&engine->pending);
1716         INIT_LIST_HEAD(&engine->completed);
1717         INIT_LIST_HEAD(&engine->in_progress);
1718         engine->in_flight = 0;
1719         tasklet_init(&engine->complete, spacc_spacc_complete,
1720                      (unsigned long)engine);
1721
1722         platform_set_drvdata(pdev, engine);
1723
1724         ret = -EINVAL;
1725         INIT_LIST_HEAD(&engine->registered_algs);
1726         for (i = 0; i < engine->num_algs; ++i) {
1727                 engine->algs[i].engine = engine;
1728                 err = crypto_register_alg(&engine->algs[i].alg);
1729                 if (!err) {
1730                         list_add_tail(&engine->algs[i].entry,
1731                                       &engine->registered_algs);
1732                         ret = 0;
1733                 }
1734                 if (err)
1735                         dev_err(engine->dev, "failed to register alg \"%s\"\n",
1736                                 engine->algs[i].alg.cra_name);
1737                 else
1738                         dev_dbg(engine->dev, "registered alg \"%s\"\n",
1739                                 engine->algs[i].alg.cra_name);
1740         }
1741
1742         INIT_LIST_HEAD(&engine->registered_aeads);
1743         for (i = 0; i < engine->num_aeads; ++i) {
1744                 engine->aeads[i].engine = engine;
1745                 err = crypto_register_aead(&engine->aeads[i].alg);
1746                 if (!err) {
1747                         list_add_tail(&engine->aeads[i].entry,
1748                                       &engine->registered_aeads);
1749                         ret = 0;
1750                 }
1751                 if (err)
1752                         dev_err(engine->dev, "failed to register alg \"%s\"\n",
1753                                 engine->aeads[i].alg.base.cra_name);
1754                 else
1755                         dev_dbg(engine->dev, "registered alg \"%s\"\n",
1756                                 engine->aeads[i].alg.base.cra_name);
1757         }
1758
1759         if (!ret)
1760                 return 0;
1761
1762         del_timer_sync(&engine->packet_timeout);
1763         device_remove_file(&pdev->dev, &dev_attr_stat_irq_thresh);
1764 err_clk_disable:
1765         clk_disable_unprepare(engine->clk);
1766 err_clk_put:
1767         clk_put(engine->clk);
1768
1769         return ret;
1770 }
1771
1772 static int spacc_remove(struct platform_device *pdev)
1773 {
1774         struct spacc_aead *aead, *an;
1775         struct spacc_alg *alg, *next;
1776         struct spacc_engine *engine = platform_get_drvdata(pdev);
1777
1778         del_timer_sync(&engine->packet_timeout);
1779         device_remove_file(&pdev->dev, &dev_attr_stat_irq_thresh);
1780
1781         list_for_each_entry_safe(aead, an, &engine->registered_aeads, entry) {
1782                 list_del(&aead->entry);
1783                 crypto_unregister_aead(&aead->alg);
1784         }
1785
1786         list_for_each_entry_safe(alg, next, &engine->registered_algs, entry) {
1787                 list_del(&alg->entry);
1788                 crypto_unregister_alg(&alg->alg);
1789         }
1790
1791         clk_disable_unprepare(engine->clk);
1792         clk_put(engine->clk);
1793
1794         return 0;
1795 }
1796
1797 static struct platform_driver spacc_driver = {
1798         .probe          = spacc_probe,
1799         .remove         = spacc_remove,
1800         .driver         = {
1801                 .name   = "picochip,spacc",
1802 #ifdef CONFIG_PM
1803                 .pm     = &spacc_pm_ops,
1804 #endif /* CONFIG_PM */
1805                 .of_match_table = of_match_ptr(spacc_of_id_table),
1806         },
1807 };
1808
1809 module_platform_driver(spacc_driver);
1810
1811 MODULE_LICENSE("GPL");
1812 MODULE_AUTHOR("Jamie Iles");