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_ablkcipher        *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         return 0;
 503
 504 badkey:
 505         crypto_aead_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
 506         return -EINVAL;
 507 }
 508
 509 static int spacc_aead_setauthsize(struct crypto_aead *tfm,
 510                                   unsigned int authsize)
 511 {
 512         struct spacc_aead_ctx *ctx = crypto_tfm_ctx(crypto_aead_tfm(tfm));
 513
 514         return crypto_aead_setauthsize(ctx->sw_cipher, authsize);
 515 }
 516
 517 /*
 518  * Check if an AEAD request requires a fallback operation. Some requests can't
 519  * be completed in hardware because the hardware may not support certain key
 520  * sizes. In these cases we need to complete the request in software.
 521  */
 522 static int spacc_aead_need_fallback(struct aead_request *aead_req)
 523 {
 524         struct crypto_aead *aead = crypto_aead_reqtfm(aead_req);
 525         struct aead_alg *alg = crypto_aead_alg(aead);
 526         struct spacc_aead *spacc_alg = to_spacc_aead(alg);
 527         struct spacc_aead_ctx *ctx = crypto_aead_ctx(aead);
 528
 529         /*
 530          * If we have a non-supported key-length, then we need to do a
 531          * software fallback.
 532          */
 533         if ((spacc_alg->ctrl_default & SPACC_CRYPTO_ALG_MASK) ==
 534             SPA_CTRL_CIPH_ALG_AES &&
 535             ctx->cipher_key_len != AES_KEYSIZE_128 &&
 536             ctx->cipher_key_len != AES_KEYSIZE_256)
 537                 return 1;
 538
 539         return 0;
 540 }
 541
 542 static int spacc_aead_do_fallback(struct aead_request *req, unsigned alg_type,
 543                                   bool is_encrypt)
 544 {
 545         struct crypto_tfm *old_tfm = crypto_aead_tfm(crypto_aead_reqtfm(req));
 546         struct spacc_aead_ctx *ctx = crypto_tfm_ctx(old_tfm);
 547         struct aead_request *subreq = aead_request_ctx(req);
 548
 549         aead_request_set_tfm(subreq, ctx->sw_cipher);
 550         aead_request_set_callback(subreq, req->base.flags,
 551                                   req->base.complete, req->base.data);
 552         aead_request_set_crypt(subreq, req->src, req->dst, req->cryptlen,
 553                                req->iv);
 554         aead_request_set_ad(subreq, req->assoclen);
 555
 556         return is_encrypt ? crypto_aead_encrypt(subreq) :
 557                             crypto_aead_decrypt(subreq);
 558 }
 559
 560 static void spacc_aead_complete(struct spacc_req *req)
 561 {
 562         spacc_aead_free_ddts(req);
 563         req->req->complete(req->req, req->result);
 564 }
 565
 566 static int spacc_aead_submit(struct spacc_req *req)
 567 {
 568         struct aead_request *aead_req =
 569                 container_of(req->req, struct aead_request, base);
 570         struct crypto_aead *aead = crypto_aead_reqtfm(aead_req);
 571         unsigned int authsize = crypto_aead_authsize(aead);
 572         struct spacc_aead_ctx *ctx = crypto_aead_ctx(aead);
 573         struct aead_alg *alg = crypto_aead_alg(aead);
 574         struct spacc_aead *spacc_alg = to_spacc_aead(alg);
 575         struct spacc_engine *engine = ctx->generic.engine;
 576         u32 ctrl, proc_len, assoc_len;
 577
 578         req->result = -EINPROGRESS;
 579         req->ctx_id = spacc_load_ctx(&ctx->generic, ctx->cipher_key,
 580                 ctx->cipher_key_len, aead_req->iv, crypto_aead_ivsize(aead),
 581                 ctx->hash_ctx, ctx->hash_key_len);
 582
 583         /* Set the source and destination DDT pointers. */
 584         writel(req->src_addr, engine->regs + SPA_SRC_PTR_REG_OFFSET);
 585         writel(req->dst_addr, engine->regs + SPA_DST_PTR_REG_OFFSET);
 586         writel(0, engine->regs + SPA_OFFSET_REG_OFFSET);
 587
 588         assoc_len = aead_req->assoclen;
 589         proc_len = aead_req->cryptlen + assoc_len;
 590
 591         /*
 592          * If we are decrypting, we need to take the length of the ICV out of
 593          * the processing length.
 594          */
 595         if (!req->is_encrypt)
 596                 proc_len -= authsize;
 597
 598         writel(proc_len, engine->regs + SPA_PROC_LEN_REG_OFFSET);
 599         writel(assoc_len, engine->regs + SPA_AAD_LEN_REG_OFFSET);
 600         writel(authsize, engine->regs + SPA_ICV_LEN_REG_OFFSET);
 601         writel(0, engine->regs + SPA_ICV_OFFSET_REG_OFFSET);
 602         writel(0, engine->regs + SPA_AUX_INFO_REG_OFFSET);
 603
 604         ctrl = spacc_alg->ctrl_default | (req->ctx_id << SPA_CTRL_CTX_IDX) |
 605                 (1 << SPA_CTRL_ICV_APPEND);
 606         if (req->is_encrypt)
 607                 ctrl |= (1 << SPA_CTRL_ENCRYPT_IDX) | (1 << SPA_CTRL_AAD_COPY);
 608         else
 609                 ctrl |= (1 << SPA_CTRL_KEY_EXP);
 610
 611         mod_timer(&engine->packet_timeout, jiffies + PACKET_TIMEOUT);
 612
 613         writel(ctrl, engine->regs + SPA_CTRL_REG_OFFSET);
 614
 615         return -EINPROGRESS;
 616 }
 617
 618 static int spacc_req_submit(struct spacc_req *req);
 619
 620 static void spacc_push(struct spacc_engine *engine)
 621 {
 622         struct spacc_req *req;
 623
 624         while (!list_empty(&engine->pending) &&
 625                engine->in_flight + 1 <= engine->fifo_sz) {
 626
 627                 ++engine->in_flight;
 628                 req = list_first_entry(&engine->pending, struct spacc_req,
 629                                        list);
 630                 list_move_tail(&req->list, &engine->in_progress);
 631
 632                 req->result = spacc_req_submit(req);
 633         }
 634 }
 635
 636 /*
 637  * Setup an AEAD request for processing. This will configure the engine, load
 638  * the context and then start the packet processing.
 639  */
 640 static int spacc_aead_setup(struct aead_request *req,
 641                             unsigned alg_type, bool is_encrypt)
 642 {
 643         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 644         struct aead_alg *alg = crypto_aead_alg(aead);
 645         struct spacc_engine *engine = to_spacc_aead(alg)->engine;
 646         struct spacc_req *dev_req = aead_request_ctx(req);
 647         int err;
 648         unsigned long flags;
 649
 650         dev_req->req            = &req->base;
 651         dev_req->is_encrypt     = is_encrypt;
 652         dev_req->result         = -EBUSY;
 653         dev_req->engine         = engine;
 654         dev_req->complete       = spacc_aead_complete;
 655
 656         if (unlikely(spacc_aead_need_fallback(req) ||
 657                      ((err = spacc_aead_make_ddts(req)) == -E2BIG)))
 658                 return spacc_aead_do_fallback(req, alg_type, is_encrypt);
 659
 660         if (err)
 661                 goto out;
 662
 663         err = -EINPROGRESS;
 664         spin_lock_irqsave(&engine->hw_lock, flags);
 665         if (unlikely(spacc_fifo_cmd_full(engine)) ||
 666             engine->in_flight + 1 > engine->fifo_sz) {
 667                 if (!(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
 668                         err = -EBUSY;
 669                         spin_unlock_irqrestore(&engine->hw_lock, flags);
 670                         goto out_free_ddts;
 671                 }
 672                 list_add_tail(&dev_req->list, &engine->pending);
 673         } else {
 674                 list_add_tail(&dev_req->list, &engine->pending);
 675                 spacc_push(engine);
 676         }
 677         spin_unlock_irqrestore(&engine->hw_lock, flags);
 678
 679         goto out;
 680
 681 out_free_ddts:
 682         spacc_aead_free_ddts(dev_req);
 683 out:
 684         return err;
 685 }
 686
 687 static int spacc_aead_encrypt(struct aead_request *req)
 688 {
 689         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 690         struct spacc_aead *alg = to_spacc_aead(crypto_aead_alg(aead));
 691
 692         return spacc_aead_setup(req, alg->type, 1);
 693 }
 694
 695 static int spacc_aead_decrypt(struct aead_request *req)
 696 {
 697         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 698         struct spacc_aead  *alg = to_spacc_aead(crypto_aead_alg(aead));
 699
 700         return spacc_aead_setup(req, alg->type, 0);
 701 }
 702
 703 /*
 704  * Initialise a new AEAD context. This is responsible for allocating the
 705  * fallback cipher and initialising the context.
 706  */
 707 static int spacc_aead_cra_init(struct crypto_aead *tfm)
 708 {
 709         struct spacc_aead_ctx *ctx = crypto_aead_ctx(tfm);
 710         struct aead_alg *alg = crypto_aead_alg(tfm);
 711         struct spacc_aead *spacc_alg = to_spacc_aead(alg);
 712         struct spacc_engine *engine = spacc_alg->engine;
 713
 714         ctx->generic.flags = spacc_alg->type;
 715         ctx->generic.engine = engine;
 716         ctx->sw_cipher = crypto_alloc_aead(alg->base.cra_name, 0,
 717                                            CRYPTO_ALG_NEED_FALLBACK);
 718         if (IS_ERR(ctx->sw_cipher))
 719                 return PTR_ERR(ctx->sw_cipher);
 720         ctx->generic.key_offs = spacc_alg->key_offs;
 721         ctx->generic.iv_offs = spacc_alg->iv_offs;
 722
 723         crypto_aead_set_reqsize(
 724                 tfm,
 725                 max(sizeof(struct spacc_req),
 726                     sizeof(struct aead_request) +
 727                     crypto_aead_reqsize(ctx->sw_cipher)));
 728
 729         return 0;
 730 }
 731
 732 /*
 733  * Destructor for an AEAD context. This is called when the transform is freed
 734  * and must free the fallback cipher.
 735  */
 736 static void spacc_aead_cra_exit(struct crypto_aead *tfm)
 737 {
 738         struct spacc_aead_ctx *ctx = crypto_aead_ctx(tfm);
 739
 740         crypto_free_aead(ctx->sw_cipher);
 741 }
 742
 743 /*
 744  * Set the DES key for a block cipher transform. This also performs weak key
 745  * checking if the transform has requested it.
 746  */
 747 static int spacc_des_setkey(struct crypto_ablkcipher *cipher, const u8 *key,
 748                             unsigned int len)
 749 {
 750         struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
 751         struct spacc_ablk_ctx *ctx = crypto_tfm_ctx(tfm);
 752         u32 tmp[DES_EXPKEY_WORDS];
 753
 754         if (len > DES3_EDE_KEY_SIZE) {
 755                 crypto_ablkcipher_set_flags(cipher, CRYPTO_TFM_RES_BAD_KEY_LEN);
 756                 return -EINVAL;
 757         }
 758
 759         if (unlikely(!des_ekey(tmp, key)) &&
 760             (crypto_ablkcipher_get_flags(cipher) & CRYPTO_TFM_REQ_WEAK_KEY)) {
 761                 tfm->crt_flags |= CRYPTO_TFM_RES_WEAK_KEY;
 762                 return -EINVAL;
 763         }
 764
 765         memcpy(ctx->key, key, len);
 766         ctx->key_len = len;
 767
 768         return 0;
 769 }
 770
 771 /*
 772  * Set the key for an AES block cipher. Some key lengths are not supported in
 773  * hardware so this must also check whether a fallback is needed.
 774  */
 775 static int spacc_aes_setkey(struct crypto_ablkcipher *cipher, const u8 *key,
 776                             unsigned int len)
 777 {
 778         struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
 779         struct spacc_ablk_ctx *ctx = crypto_tfm_ctx(tfm);
 780         int err = 0;
 781
 782         if (len > AES_MAX_KEY_SIZE) {
 783                 crypto_ablkcipher_set_flags(cipher, CRYPTO_TFM_RES_BAD_KEY_LEN);
 784                 return -EINVAL;
 785         }
 786
 787         /*
 788          * IPSec engine only supports 128 and 256 bit AES keys. If we get a
 789          * request for any other size (192 bits) then we need to do a software
 790          * fallback.
 791          */
 792         if (len != AES_KEYSIZE_128 && len != AES_KEYSIZE_256 &&
 793             ctx->sw_cipher) {
 794                 /*
 795                  * Set the fallback transform to use the same request flags as
 796                  * the hardware transform.
 797                  */
 798                 ctx->sw_cipher->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
 799                 ctx->sw_cipher->base.crt_flags |=
 800                         cipher->base.crt_flags & CRYPTO_TFM_REQ_MASK;
 801
 802                 err = crypto_ablkcipher_setkey(ctx->sw_cipher, key, len);
 803                 if (err)
 804                         goto sw_setkey_failed;
 805         } else if (len != AES_KEYSIZE_128 && len != AES_KEYSIZE_256 &&
 806                    !ctx->sw_cipher)
 807                 err = -EINVAL;
 808
 809         memcpy(ctx->key, key, len);
 810         ctx->key_len = len;
 811
 812 sw_setkey_failed:
 813         if (err && ctx->sw_cipher) {
 814                 tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
 815                 tfm->crt_flags |=
 816                         ctx->sw_cipher->base.crt_flags & CRYPTO_TFM_RES_MASK;
 817         }
 818
 819         return err;
 820 }
 821
 822 static int spacc_kasumi_f8_setkey(struct crypto_ablkcipher *cipher,
 823                                   const u8 *key, unsigned int len)
 824 {
 825         struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
 826         struct spacc_ablk_ctx *ctx = crypto_tfm_ctx(tfm);
 827         int err = 0;
 828
 829         if (len > AES_MAX_KEY_SIZE) {
 830                 crypto_ablkcipher_set_flags(cipher, CRYPTO_TFM_RES_BAD_KEY_LEN);
 831                 err = -EINVAL;
 832                 goto out;
 833         }
 834
 835         memcpy(ctx->key, key, len);
 836         ctx->key_len = len;
 837
 838 out:
 839         return err;
 840 }
 841
 842 static int spacc_ablk_need_fallback(struct spacc_req *req)
 843 {
 844         struct spacc_ablk_ctx *ctx;
 845         struct crypto_tfm *tfm = req->req->tfm;
 846         struct crypto_alg *alg = req->req->tfm->__crt_alg;
 847         struct spacc_alg *spacc_alg = to_spacc_alg(alg);
 848
 849         ctx = crypto_tfm_ctx(tfm);
 850
 851         return (spacc_alg->ctrl_default & SPACC_CRYPTO_ALG_MASK) ==
 852                         SPA_CTRL_CIPH_ALG_AES &&
 853                         ctx->key_len != AES_KEYSIZE_128 &&
 854                         ctx->key_len != AES_KEYSIZE_256;
 855 }
 856
 857 static void spacc_ablk_complete(struct spacc_req *req)
 858 {
 859         struct ablkcipher_request *ablk_req = ablkcipher_request_cast(req->req);
 860
 861         if (ablk_req->src != ablk_req->dst) {
 862                 spacc_free_ddt(req, req->src_ddt, req->src_addr, ablk_req->src,
 863                                ablk_req->nbytes, DMA_TO_DEVICE);
 864                 spacc_free_ddt(req, req->dst_ddt, req->dst_addr, ablk_req->dst,
 865                                ablk_req->nbytes, DMA_FROM_DEVICE);
 866         } else
 867                 spacc_free_ddt(req, req->dst_ddt, req->dst_addr, ablk_req->dst,
 868                                ablk_req->nbytes, DMA_BIDIRECTIONAL);
 869
 870         req->req->complete(req->req, req->result);
 871 }
 872
 873 static int spacc_ablk_submit(struct spacc_req *req)
 874 {
 875         struct crypto_tfm *tfm = req->req->tfm;
 876         struct spacc_ablk_ctx *ctx = crypto_tfm_ctx(tfm);
 877         struct ablkcipher_request *ablk_req = ablkcipher_request_cast(req->req);
 878         struct crypto_alg *alg = req->req->tfm->__crt_alg;
 879         struct spacc_alg *spacc_alg = to_spacc_alg(alg);
 880         struct spacc_engine *engine = ctx->generic.engine;
 881         u32 ctrl;
 882
 883         req->ctx_id = spacc_load_ctx(&ctx->generic, ctx->key,
 884                 ctx->key_len, ablk_req->info, alg->cra_ablkcipher.ivsize,
 885                 NULL, 0);
 886
 887         writel(req->src_addr, engine->regs + SPA_SRC_PTR_REG_OFFSET);
 888         writel(req->dst_addr, engine->regs + SPA_DST_PTR_REG_OFFSET);
 889         writel(0, engine->regs + SPA_OFFSET_REG_OFFSET);
 890
 891         writel(ablk_req->nbytes, engine->regs + SPA_PROC_LEN_REG_OFFSET);
 892         writel(0, engine->regs + SPA_ICV_OFFSET_REG_OFFSET);
 893         writel(0, engine->regs + SPA_AUX_INFO_REG_OFFSET);
 894         writel(0, engine->regs + SPA_AAD_LEN_REG_OFFSET);
 895
 896         ctrl = spacc_alg->ctrl_default | (req->ctx_id << SPA_CTRL_CTX_IDX) |
 897                 (req->is_encrypt ? (1 << SPA_CTRL_ENCRYPT_IDX) :
 898                  (1 << SPA_CTRL_KEY_EXP));
 899
 900         mod_timer(&engine->packet_timeout, jiffies + PACKET_TIMEOUT);
 901
 902         writel(ctrl, engine->regs + SPA_CTRL_REG_OFFSET);
 903
 904         return -EINPROGRESS;
 905 }
 906
 907 static int spacc_ablk_do_fallback(struct ablkcipher_request *req,
 908                                   unsigned alg_type, bool is_encrypt)
 909 {
 910         struct crypto_tfm *old_tfm =
 911             crypto_ablkcipher_tfm(crypto_ablkcipher_reqtfm(req));
 912         struct spacc_ablk_ctx *ctx = crypto_tfm_ctx(old_tfm);
 913         int err;
 914
 915         if (!ctx->sw_cipher)
 916                 return -EINVAL;
 917
 918         /*
 919          * Change the request to use the software fallback transform, and once
 920          * the ciphering has completed, put the old transform back into the
 921          * request.
 922          */
 923         ablkcipher_request_set_tfm(req, ctx->sw_cipher);
 924         err = is_encrypt ? crypto_ablkcipher_encrypt(req) :
 925                 crypto_ablkcipher_decrypt(req);
 926         ablkcipher_request_set_tfm(req, __crypto_ablkcipher_cast(old_tfm));
 927
 928         return err;
 929 }
 930
 931 static int spacc_ablk_setup(struct ablkcipher_request *req, unsigned alg_type,
 932                             bool is_encrypt)
 933 {
 934         struct crypto_alg *alg = req->base.tfm->__crt_alg;
 935         struct spacc_engine *engine = to_spacc_alg(alg)->engine;
 936         struct spacc_req *dev_req = ablkcipher_request_ctx(req);
 937         unsigned long flags;
 938         int err = -ENOMEM;
 939
 940         dev_req->req            = &req->base;
 941         dev_req->is_encrypt     = is_encrypt;
 942         dev_req->engine         = engine;
 943         dev_req->complete       = spacc_ablk_complete;
 944         dev_req->result         = -EINPROGRESS;
 945
 946         if (unlikely(spacc_ablk_need_fallback(dev_req)))
 947                 return spacc_ablk_do_fallback(req, alg_type, is_encrypt);
 948
 949         /*
 950          * Create the DDT's for the engine. If we share the same source and
 951          * destination then we can optimize by reusing the DDT's.
 952          */
 953         if (req->src != req->dst) {
 954                 dev_req->src_ddt = spacc_sg_to_ddt(engine, req->src,
 955                         req->nbytes, DMA_TO_DEVICE, &dev_req->src_addr);
 956                 if (!dev_req->src_ddt)
 957                         goto out;
 958
 959                 dev_req->dst_ddt = spacc_sg_to_ddt(engine, req->dst,
 960                         req->nbytes, DMA_FROM_DEVICE, &dev_req->dst_addr);
 961                 if (!dev_req->dst_ddt)
 962                         goto out_free_src;
 963         } else {
 964                 dev_req->dst_ddt = spacc_sg_to_ddt(engine, req->dst,
 965                         req->nbytes, DMA_BIDIRECTIONAL, &dev_req->dst_addr);
 966                 if (!dev_req->dst_ddt)
 967                         goto out;
 968
 969                 dev_req->src_ddt = NULL;
 970                 dev_req->src_addr = dev_req->dst_addr;
 971         }
 972
 973         err = -EINPROGRESS;
 974         spin_lock_irqsave(&engine->hw_lock, flags);
 975         /*
 976          * Check if the engine will accept the operation now. If it won't then
 977          * we either stick it on the end of a pending list if we can backlog,
 978          * or bailout with an error if not.
 979          */
 980         if (unlikely(spacc_fifo_cmd_full(engine)) ||
 981             engine->in_flight + 1 > engine->fifo_sz) {
 982                 if (!(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
 983                         err = -EBUSY;
 984                         spin_unlock_irqrestore(&engine->hw_lock, flags);
 985                         goto out_free_ddts;
 986                 }
 987                 list_add_tail(&dev_req->list, &engine->pending);
 988         } else {
 989                 list_add_tail(&dev_req->list, &engine->pending);
 990                 spacc_push(engine);
 991         }
 992         spin_unlock_irqrestore(&engine->hw_lock, flags);
 993
 994         goto out;
 995
 996 out_free_ddts:
 997         spacc_free_ddt(dev_req, dev_req->dst_ddt, dev_req->dst_addr, req->dst,
 998                        req->nbytes, req->src == req->dst ?
 999                        DMA_BIDIRECTIONAL : DMA_FROM_DEVICE);
1000 out_free_src:
1001         if (req->src != req->dst)
1002                 spacc_free_ddt(dev_req, dev_req->src_ddt, dev_req->src_addr,
1003                                req->src, req->nbytes, DMA_TO_DEVICE);
1004 out:
1005         return err;
1006 }
1007
1008 static int spacc_ablk_cra_init(struct crypto_tfm *tfm)
1009 {
1010         struct spacc_ablk_ctx *ctx = crypto_tfm_ctx(tfm);
1011         struct crypto_alg *alg = tfm->__crt_alg;
1012         struct spacc_alg *spacc_alg = to_spacc_alg(alg);
1013         struct spacc_engine *engine = spacc_alg->engine;
1014
1015         ctx->generic.flags = spacc_alg->type;
1016         ctx->generic.engine = engine;
1017         if (alg->cra_flags & CRYPTO_ALG_NEED_FALLBACK) {
1018                 ctx->sw_cipher = crypto_alloc_ablkcipher(alg->cra_name, 0,
1019                                 CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);
1020                 if (IS_ERR(ctx->sw_cipher)) {
1021                         dev_warn(engine->dev, "failed to allocate fallback for %s\n",
1022                                  alg->cra_name);
1023                         ctx->sw_cipher = NULL;
1024                 }
1025         }
1026         ctx->generic.key_offs = spacc_alg->key_offs;
1027         ctx->generic.iv_offs = spacc_alg->iv_offs;
1028
1029         tfm->crt_ablkcipher.reqsize = sizeof(struct spacc_req);
1030
1031         return 0;
1032 }
1033
1034 static void spacc_ablk_cra_exit(struct crypto_tfm *tfm)
1035 {
1036         struct spacc_ablk_ctx *ctx = crypto_tfm_ctx(tfm);
1037
1038         if (ctx->sw_cipher)
1039                 crypto_free_ablkcipher(ctx->sw_cipher);
1040         ctx->sw_cipher = NULL;
1041 }
1042
1043 static int spacc_ablk_encrypt(struct ablkcipher_request *req)
1044 {
1045         struct crypto_ablkcipher *cipher = crypto_ablkcipher_reqtfm(req);
1046         struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
1047         struct spacc_alg *alg = to_spacc_alg(tfm->__crt_alg);
1048
1049         return spacc_ablk_setup(req, alg->type, 1);
1050 }
1051
1052 static int spacc_ablk_decrypt(struct ablkcipher_request *req)
1053 {
1054         struct crypto_ablkcipher *cipher = crypto_ablkcipher_reqtfm(req);
1055         struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
1056         struct spacc_alg *alg = to_spacc_alg(tfm->__crt_alg);
1057
1058         return spacc_ablk_setup(req, alg->type, 0);
1059 }
1060
1061 static inline int spacc_fifo_stat_empty(struct spacc_engine *engine)
1062 {
1063         return readl(engine->regs + SPA_FIFO_STAT_REG_OFFSET) &
1064                 SPA_FIFO_STAT_EMPTY;
1065 }
1066
1067 static void spacc_process_done(struct spacc_engine *engine)
1068 {
1069         struct spacc_req *req;
1070         unsigned long flags;
1071
1072         spin_lock_irqsave(&engine->hw_lock, flags);
1073
1074         while (!spacc_fifo_stat_empty(engine)) {
1075                 req = list_first_entry(&engine->in_progress, struct spacc_req,
1076                                        list);
1077                 list_move_tail(&req->list, &engine->completed);
1078                 --engine->in_flight;
1079
1080                 /* POP the status register. */
1081                 writel(~0, engine->regs + SPA_STAT_POP_REG_OFFSET);
1082                 req->result = (readl(engine->regs + SPA_STATUS_REG_OFFSET) &
1083                      SPA_STATUS_RES_CODE_MASK) >> SPA_STATUS_RES_CODE_OFFSET;
1084
1085                 /*
1086                  * Convert the SPAcc error status into the standard POSIX error
1087                  * codes.
1088                  */
1089                 if (unlikely(req->result)) {
1090                         switch (req->result) {
1091                         case SPA_STATUS_ICV_FAIL:
1092                                 req->result = -EBADMSG;
1093                                 break;
1094
1095                         case SPA_STATUS_MEMORY_ERROR:
1096                                 dev_warn(engine->dev,
1097                                          "memory error triggered\n");
1098                                 req->result = -EFAULT;
1099                                 break;
1100
1101                         case SPA_STATUS_BLOCK_ERROR:
1102                                 dev_warn(engine->dev,
1103                                          "block error triggered\n");
1104                                 req->result = -EIO;
1105                                 break;
1106                         }
1107                 }
1108         }
1109
1110         tasklet_schedule(&engine->complete);
1111
1112         spin_unlock_irqrestore(&engine->hw_lock, flags);
1113 }
1114
1115 static irqreturn_t spacc_spacc_irq(int irq, void *dev)
1116 {
1117         struct spacc_engine *engine = (struct spacc_engine *)dev;
1118         u32 spacc_irq_stat = readl(engine->regs + SPA_IRQ_STAT_REG_OFFSET);
1119
1120         writel(spacc_irq_stat, engine->regs + SPA_IRQ_STAT_REG_OFFSET);
1121         spacc_process_done(engine);
1122
1123         return IRQ_HANDLED;
1124 }
1125
1126 static void spacc_packet_timeout(unsigned long data)
1127 {
1128         struct spacc_engine *engine = (struct spacc_engine *)data;
1129
1130         spacc_process_done(engine);
1131 }
1132
1133 static int spacc_req_submit(struct spacc_req *req)
1134 {
1135         struct crypto_alg *alg = req->req->tfm->__crt_alg;
1136
1137         if (CRYPTO_ALG_TYPE_AEAD == (CRYPTO_ALG_TYPE_MASK & alg->cra_flags))
1138                 return spacc_aead_submit(req);
1139         else
1140                 return spacc_ablk_submit(req);
1141 }
1142
1143 static void spacc_spacc_complete(unsigned long data)
1144 {
1145         struct spacc_engine *engine = (struct spacc_engine *)data;
1146         struct spacc_req *req, *tmp;
1147         unsigned long flags;
1148         LIST_HEAD(completed);
1149
1150         spin_lock_irqsave(&engine->hw_lock, flags);
1151
1152         list_splice_init(&engine->completed, &completed);
1153         spacc_push(engine);
1154         if (engine->in_flight)
1155                 mod_timer(&engine->packet_timeout, jiffies + PACKET_TIMEOUT);
1156
1157         spin_unlock_irqrestore(&engine->hw_lock, flags);
1158
1159         list_for_each_entry_safe(req, tmp, &completed, list) {
1160                 list_del(&req->list);
1161                 req->complete(req);
1162         }
1163 }
1164
1165 #ifdef CONFIG_PM
1166 static int spacc_suspend(struct device *dev)
1167 {
1168         struct platform_device *pdev = to_platform_device(dev);
1169         struct spacc_engine *engine = platform_get_drvdata(pdev);
1170
1171         /*
1172          * We only support standby mode. All we have to do is gate the clock to
1173          * the spacc. The hardware will preserve state until we turn it back
1174          * on again.
1175          */
1176         clk_disable(engine->clk);
1177
1178         return 0;
1179 }
1180
1181 static int spacc_resume(struct device *dev)
1182 {
1183         struct platform_device *pdev = to_platform_device(dev);
1184         struct spacc_engine *engine = platform_get_drvdata(pdev);
1185
1186         return clk_enable(engine->clk);
1187 }
1188
1189 static const struct dev_pm_ops spacc_pm_ops = {
1190         .suspend        = spacc_suspend,
1191         .resume         = spacc_resume,
1192 };
1193 #endif /* CONFIG_PM */
1194
1195 static inline struct spacc_engine *spacc_dev_to_engine(struct device *dev)
1196 {
1197         return dev ? platform_get_drvdata(to_platform_device(dev)) : NULL;
1198 }
1199
1200 static ssize_t spacc_stat_irq_thresh_show(struct device *dev,
1201                                           struct device_attribute *attr,
1202                                           char *buf)
1203 {
1204         struct spacc_engine *engine = spacc_dev_to_engine(dev);
1205
1206         return snprintf(buf, PAGE_SIZE, "%u\n", engine->stat_irq_thresh);
1207 }
1208
1209 static ssize_t spacc_stat_irq_thresh_store(struct device *dev,
1210                                            struct device_attribute *attr,
1211                                            const char *buf, size_t len)
1212 {
1213         struct spacc_engine *engine = spacc_dev_to_engine(dev);
1214         unsigned long thresh;
1215
1216         if (kstrtoul(buf, 0, &thresh))
1217                 return -EINVAL;
1218
1219         thresh = clamp(thresh, 1UL, engine->fifo_sz - 1);
1220
1221         engine->stat_irq_thresh = thresh;
1222         writel(engine->stat_irq_thresh << SPA_IRQ_CTRL_STAT_CNT_OFFSET,
1223                engine->regs + SPA_IRQ_CTRL_REG_OFFSET);
1224
1225         return len;
1226 }
1227 static DEVICE_ATTR(stat_irq_thresh, 0644, spacc_stat_irq_thresh_show,
1228                    spacc_stat_irq_thresh_store);
1229
1230 static struct spacc_alg ipsec_engine_algs[] = {
1231         {
1232                 .ctrl_default = SPA_CTRL_CIPH_ALG_AES | SPA_CTRL_CIPH_MODE_CBC,
1233                 .key_offs = 0,
1234                 .iv_offs = AES_MAX_KEY_SIZE,
1235                 .alg = {
1236                         .cra_name = "cbc(aes)",
1237                         .cra_driver_name = "cbc-aes-picoxcell",
1238                         .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1239                         .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
1240                                      CRYPTO_ALG_KERN_DRIVER_ONLY |
1241                                      CRYPTO_ALG_ASYNC |
1242                                      CRYPTO_ALG_NEED_FALLBACK,
1243                         .cra_blocksize = AES_BLOCK_SIZE,
1244                         .cra_ctxsize = sizeof(struct spacc_ablk_ctx),
1245                         .cra_type = &crypto_ablkcipher_type,
1246                         .cra_module = THIS_MODULE,
1247                         .cra_ablkcipher = {
1248                                 .setkey = spacc_aes_setkey,
1249                                 .encrypt = spacc_ablk_encrypt,
1250                                 .decrypt = spacc_ablk_decrypt,
1251                                 .min_keysize = AES_MIN_KEY_SIZE,
1252                                 .max_keysize = AES_MAX_KEY_SIZE,
1253                                 .ivsize = AES_BLOCK_SIZE,
1254                         },
1255                         .cra_init = spacc_ablk_cra_init,
1256                         .cra_exit = spacc_ablk_cra_exit,
1257                 },
1258         },
1259         {
1260                 .key_offs = 0,
1261                 .iv_offs = AES_MAX_KEY_SIZE,
1262                 .ctrl_default = SPA_CTRL_CIPH_ALG_AES | SPA_CTRL_CIPH_MODE_ECB,
1263                 .alg = {
1264                         .cra_name = "ecb(aes)",
1265                         .cra_driver_name = "ecb-aes-picoxcell",
1266                         .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1267                         .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
1268                                 CRYPTO_ALG_KERN_DRIVER_ONLY |
1269                                 CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK,
1270                         .cra_blocksize = AES_BLOCK_SIZE,
1271                         .cra_ctxsize = sizeof(struct spacc_ablk_ctx),
1272                         .cra_type = &crypto_ablkcipher_type,
1273                         .cra_module = THIS_MODULE,
1274                         .cra_ablkcipher = {
1275                                 .setkey = spacc_aes_setkey,
1276                                 .encrypt = spacc_ablk_encrypt,
1277                                 .decrypt = spacc_ablk_decrypt,
1278                                 .min_keysize = AES_MIN_KEY_SIZE,
1279                                 .max_keysize = AES_MAX_KEY_SIZE,
1280                         },
1281                         .cra_init = spacc_ablk_cra_init,
1282                         .cra_exit = spacc_ablk_cra_exit,
1283                 },
1284         },
1285         {
1286                 .key_offs = DES_BLOCK_SIZE,
1287                 .iv_offs = 0,
1288                 .ctrl_default = SPA_CTRL_CIPH_ALG_DES | SPA_CTRL_CIPH_MODE_CBC,
1289                 .alg = {
1290                         .cra_name = "cbc(des)",
1291                         .cra_driver_name = "cbc-des-picoxcell",
1292                         .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1293                         .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
1294                                         CRYPTO_ALG_ASYNC |
1295                                         CRYPTO_ALG_KERN_DRIVER_ONLY,
1296                         .cra_blocksize = DES_BLOCK_SIZE,
1297                         .cra_ctxsize = sizeof(struct spacc_ablk_ctx),
1298                         .cra_type = &crypto_ablkcipher_type,
1299                         .cra_module = THIS_MODULE,
1300                         .cra_ablkcipher = {
1301                                 .setkey = spacc_des_setkey,
1302                                 .encrypt = spacc_ablk_encrypt,
1303                                 .decrypt = spacc_ablk_decrypt,
1304                                 .min_keysize = DES_KEY_SIZE,
1305                                 .max_keysize = DES_KEY_SIZE,
1306                                 .ivsize = DES_BLOCK_SIZE,
1307                         },
1308                         .cra_init = spacc_ablk_cra_init,
1309                         .cra_exit = spacc_ablk_cra_exit,
1310                 },
1311         },
1312         {
1313                 .key_offs = DES_BLOCK_SIZE,
1314                 .iv_offs = 0,
1315                 .ctrl_default = SPA_CTRL_CIPH_ALG_DES | SPA_CTRL_CIPH_MODE_ECB,
1316                 .alg = {
1317                         .cra_name = "ecb(des)",
1318                         .cra_driver_name = "ecb-des-picoxcell",
1319                         .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1320                         .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
1321                                         CRYPTO_ALG_ASYNC |
1322                                         CRYPTO_ALG_KERN_DRIVER_ONLY,
1323                         .cra_blocksize = DES_BLOCK_SIZE,
1324                         .cra_ctxsize = sizeof(struct spacc_ablk_ctx),
1325                         .cra_type = &crypto_ablkcipher_type,
1326                         .cra_module = THIS_MODULE,
1327                         .cra_ablkcipher = {
1328                                 .setkey = spacc_des_setkey,
1329                                 .encrypt = spacc_ablk_encrypt,
1330                                 .decrypt = spacc_ablk_decrypt,
1331                                 .min_keysize = DES_KEY_SIZE,
1332                                 .max_keysize = DES_KEY_SIZE,
1333                         },
1334                         .cra_init = spacc_ablk_cra_init,
1335                         .cra_exit = spacc_ablk_cra_exit,
1336                 },
1337         },
1338         {
1339                 .key_offs = DES_BLOCK_SIZE,
1340                 .iv_offs = 0,
1341                 .ctrl_default = SPA_CTRL_CIPH_ALG_DES | SPA_CTRL_CIPH_MODE_CBC,
1342                 .alg = {
1343                         .cra_name = "cbc(des3_ede)",
1344                         .cra_driver_name = "cbc-des3-ede-picoxcell",
1345                         .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1346                         .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
1347                                         CRYPTO_ALG_ASYNC |
1348                                         CRYPTO_ALG_KERN_DRIVER_ONLY,
1349                         .cra_blocksize = DES3_EDE_BLOCK_SIZE,
1350                         .cra_ctxsize = sizeof(struct spacc_ablk_ctx),
1351                         .cra_type = &crypto_ablkcipher_type,
1352                         .cra_module = THIS_MODULE,
1353                         .cra_ablkcipher = {
1354                                 .setkey = spacc_des_setkey,
1355                                 .encrypt = spacc_ablk_encrypt,
1356                                 .decrypt = spacc_ablk_decrypt,
1357                                 .min_keysize = DES3_EDE_KEY_SIZE,
1358                                 .max_keysize = DES3_EDE_KEY_SIZE,
1359                                 .ivsize = DES3_EDE_BLOCK_SIZE,
1360                         },
1361                         .cra_init = spacc_ablk_cra_init,
1362                         .cra_exit = spacc_ablk_cra_exit,
1363                 },
1364         },
1365         {
1366                 .key_offs = DES_BLOCK_SIZE,
1367                 .iv_offs = 0,
1368                 .ctrl_default = SPA_CTRL_CIPH_ALG_DES | SPA_CTRL_CIPH_MODE_ECB,
1369                 .alg = {
1370                         .cra_name = "ecb(des3_ede)",
1371                         .cra_driver_name = "ecb-des3-ede-picoxcell",
1372                         .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1373                         .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
1374                                         CRYPTO_ALG_ASYNC |
1375                                         CRYPTO_ALG_KERN_DRIVER_ONLY,
1376                         .cra_blocksize = DES3_EDE_BLOCK_SIZE,
1377                         .cra_ctxsize = sizeof(struct spacc_ablk_ctx),
1378                         .cra_type = &crypto_ablkcipher_type,
1379                         .cra_module = THIS_MODULE,
1380                         .cra_ablkcipher = {
1381                                 .setkey = spacc_des_setkey,
1382                                 .encrypt = spacc_ablk_encrypt,
1383                                 .decrypt = spacc_ablk_decrypt,
1384                                 .min_keysize = DES3_EDE_KEY_SIZE,
1385                                 .max_keysize = DES3_EDE_KEY_SIZE,
1386                         },
1387                         .cra_init = spacc_ablk_cra_init,
1388                         .cra_exit = spacc_ablk_cra_exit,
1389                 },
1390         },
1391 };
1392
1393 static struct spacc_aead ipsec_engine_aeads[] = {
1394         {
1395                 .ctrl_default = SPA_CTRL_CIPH_ALG_AES |
1396                                 SPA_CTRL_CIPH_MODE_CBC |
1397                                 SPA_CTRL_HASH_ALG_SHA |
1398                                 SPA_CTRL_HASH_MODE_HMAC,
1399                 .key_offs = 0,
1400                 .iv_offs = AES_MAX_KEY_SIZE,
1401                 .alg = {
1402                         .base = {
1403                                 .cra_name = "authenc(hmac(sha1),cbc(aes))",
1404                                 .cra_driver_name = "authenc-hmac-sha1-"
1405                                                    "cbc-aes-picoxcell",
1406                                 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1407                                 .cra_flags = CRYPTO_ALG_ASYNC |
1408                                              CRYPTO_ALG_NEED_FALLBACK |
1409                                              CRYPTO_ALG_KERN_DRIVER_ONLY,
1410                                 .cra_blocksize = AES_BLOCK_SIZE,
1411                                 .cra_ctxsize = sizeof(struct spacc_aead_ctx),
1412                                 .cra_module = THIS_MODULE,
1413                         },
1414                         .setkey = spacc_aead_setkey,
1415                         .setauthsize = spacc_aead_setauthsize,
1416                         .encrypt = spacc_aead_encrypt,
1417                         .decrypt = spacc_aead_decrypt,
1418                         .ivsize = AES_BLOCK_SIZE,
1419                         .maxauthsize = SHA1_DIGEST_SIZE,
1420                         .init = spacc_aead_cra_init,
1421                         .exit = spacc_aead_cra_exit,
1422                 },
1423         },
1424         {
1425                 .ctrl_default = SPA_CTRL_CIPH_ALG_AES |
1426                                 SPA_CTRL_CIPH_MODE_CBC |
1427                                 SPA_CTRL_HASH_ALG_SHA256 |
1428                                 SPA_CTRL_HASH_MODE_HMAC,
1429                 .key_offs = 0,
1430                 .iv_offs = AES_MAX_KEY_SIZE,
1431                 .alg = {
1432                         .base = {
1433                                 .cra_name = "authenc(hmac(sha256),cbc(aes))",
1434                                 .cra_driver_name = "authenc-hmac-sha256-"
1435                                                    "cbc-aes-picoxcell",
1436                                 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1437                                 .cra_flags = CRYPTO_ALG_ASYNC |
1438                                              CRYPTO_ALG_NEED_FALLBACK |
1439                                              CRYPTO_ALG_KERN_DRIVER_ONLY,
1440                                 .cra_blocksize = AES_BLOCK_SIZE,
1441                                 .cra_ctxsize = sizeof(struct spacc_aead_ctx),
1442                                 .cra_module = THIS_MODULE,
1443                         },
1444                         .setkey = spacc_aead_setkey,
1445                         .setauthsize = spacc_aead_setauthsize,
1446                         .encrypt = spacc_aead_encrypt,
1447                         .decrypt = spacc_aead_decrypt,
1448                         .ivsize = AES_BLOCK_SIZE,
1449                         .maxauthsize = SHA256_DIGEST_SIZE,
1450                         .init = spacc_aead_cra_init,
1451                         .exit = spacc_aead_cra_exit,
1452                 },
1453         },
1454         {
1455                 .key_offs = 0,
1456                 .iv_offs = AES_MAX_KEY_SIZE,
1457                 .ctrl_default = SPA_CTRL_CIPH_ALG_AES |
1458                                 SPA_CTRL_CIPH_MODE_CBC |
1459                                 SPA_CTRL_HASH_ALG_MD5 |
1460                                 SPA_CTRL_HASH_MODE_HMAC,
1461                 .alg = {
1462                         .base = {
1463                                 .cra_name = "authenc(hmac(md5),cbc(aes))",
1464                                 .cra_driver_name = "authenc-hmac-md5-"
1465                                                    "cbc-aes-picoxcell",
1466                                 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1467                                 .cra_flags = CRYPTO_ALG_ASYNC |
1468                                              CRYPTO_ALG_NEED_FALLBACK |
1469                                              CRYPTO_ALG_KERN_DRIVER_ONLY,
1470                                 .cra_blocksize = AES_BLOCK_SIZE,
1471                                 .cra_ctxsize = sizeof(struct spacc_aead_ctx),
1472                                 .cra_module = THIS_MODULE,
1473                         },
1474                         .setkey = spacc_aead_setkey,
1475                         .setauthsize = spacc_aead_setauthsize,
1476                         .encrypt = spacc_aead_encrypt,
1477                         .decrypt = spacc_aead_decrypt,
1478                         .ivsize = AES_BLOCK_SIZE,
1479                         .maxauthsize = MD5_DIGEST_SIZE,
1480                         .init = spacc_aead_cra_init,
1481                         .exit = spacc_aead_cra_exit,
1482                 },
1483         },
1484         {
1485                 .key_offs = DES_BLOCK_SIZE,
1486                 .iv_offs = 0,
1487                 .ctrl_default = SPA_CTRL_CIPH_ALG_DES |
1488                                 SPA_CTRL_CIPH_MODE_CBC |
1489                                 SPA_CTRL_HASH_ALG_SHA |
1490                                 SPA_CTRL_HASH_MODE_HMAC,
1491                 .alg = {
1492                         .base = {
1493                                 .cra_name = "authenc(hmac(sha1),cbc(des3_ede))",
1494                                 .cra_driver_name = "authenc-hmac-sha1-"
1495                                                    "cbc-3des-picoxcell",
1496                                 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1497                                 .cra_flags = CRYPTO_ALG_ASYNC |
1498                                              CRYPTO_ALG_NEED_FALLBACK |
1499                                              CRYPTO_ALG_KERN_DRIVER_ONLY,
1500                                 .cra_blocksize = DES3_EDE_BLOCK_SIZE,
1501                                 .cra_ctxsize = sizeof(struct spacc_aead_ctx),
1502                                 .cra_module = THIS_MODULE,
1503                         },
1504                         .setkey = spacc_aead_setkey,
1505                         .setauthsize = spacc_aead_setauthsize,
1506                         .encrypt = spacc_aead_encrypt,
1507                         .decrypt = spacc_aead_decrypt,
1508                         .ivsize = DES3_EDE_BLOCK_SIZE,
1509                         .maxauthsize = SHA1_DIGEST_SIZE,
1510                         .init = spacc_aead_cra_init,
1511                         .exit = spacc_aead_cra_exit,
1512                 },
1513         },
1514         {
1515                 .key_offs = DES_BLOCK_SIZE,
1516                 .iv_offs = 0,
1517                 .ctrl_default = SPA_CTRL_CIPH_ALG_AES |
1518                                 SPA_CTRL_CIPH_MODE_CBC |
1519                                 SPA_CTRL_HASH_ALG_SHA256 |
1520                                 SPA_CTRL_HASH_MODE_HMAC,
1521                 .alg = {
1522                         .base = {
1523                                 .cra_name = "authenc(hmac(sha256),"
1524                                             "cbc(des3_ede))",
1525                                 .cra_driver_name = "authenc-hmac-sha256-"
1526                                                    "cbc-3des-picoxcell",
1527                                 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1528                                 .cra_flags = CRYPTO_ALG_ASYNC |
1529                                              CRYPTO_ALG_NEED_FALLBACK |
1530                                              CRYPTO_ALG_KERN_DRIVER_ONLY,
1531                                 .cra_blocksize = DES3_EDE_BLOCK_SIZE,
1532                                 .cra_ctxsize = sizeof(struct spacc_aead_ctx),
1533                                 .cra_module = THIS_MODULE,
1534                         },
1535                         .setkey = spacc_aead_setkey,
1536                         .setauthsize = spacc_aead_setauthsize,
1537                         .encrypt = spacc_aead_encrypt,
1538                         .decrypt = spacc_aead_decrypt,
1539                         .ivsize = DES3_EDE_BLOCK_SIZE,
1540                         .maxauthsize = SHA256_DIGEST_SIZE,
1541                         .init = spacc_aead_cra_init,
1542                         .exit = spacc_aead_cra_exit,
1543                 },
1544         },
1545         {
1546                 .key_offs = DES_BLOCK_SIZE,
1547                 .iv_offs = 0,
1548                 .ctrl_default = SPA_CTRL_CIPH_ALG_DES |
1549                                 SPA_CTRL_CIPH_MODE_CBC |
1550                                 SPA_CTRL_HASH_ALG_MD5 |
1551                                 SPA_CTRL_HASH_MODE_HMAC,
1552                 .alg = {
1553                         .base = {
1554                                 .cra_name = "authenc(hmac(md5),cbc(des3_ede))",
1555                                 .cra_driver_name = "authenc-hmac-md5-"
1556                                                    "cbc-3des-picoxcell",
1557                                 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1558                                 .cra_flags = CRYPTO_ALG_ASYNC |
1559                                              CRYPTO_ALG_NEED_FALLBACK |
1560                                              CRYPTO_ALG_KERN_DRIVER_ONLY,
1561                                 .cra_blocksize = DES3_EDE_BLOCK_SIZE,
1562                                 .cra_ctxsize = sizeof(struct spacc_aead_ctx),
1563                                 .cra_module = THIS_MODULE,
1564                         },
1565                         .setkey = spacc_aead_setkey,
1566                         .setauthsize = spacc_aead_setauthsize,
1567                         .encrypt = spacc_aead_encrypt,
1568                         .decrypt = spacc_aead_decrypt,
1569                         .ivsize = DES3_EDE_BLOCK_SIZE,
1570                         .maxauthsize = MD5_DIGEST_SIZE,
1571                         .init = spacc_aead_cra_init,
1572                         .exit = spacc_aead_cra_exit,
1573                 },
1574         },
1575 };
1576
1577 static struct spacc_alg l2_engine_algs[] = {
1578         {
1579                 .key_offs = 0,
1580                 .iv_offs = SPACC_CRYPTO_KASUMI_F8_KEY_LEN,
1581                 .ctrl_default = SPA_CTRL_CIPH_ALG_KASUMI |
1582                                 SPA_CTRL_CIPH_MODE_F8,
1583                 .alg = {
1584                         .cra_name = "f8(kasumi)",
1585                         .cra_driver_name = "f8-kasumi-picoxcell",
1586                         .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1587                         .cra_flags = CRYPTO_ALG_TYPE_GIVCIPHER |
1588                                         CRYPTO_ALG_ASYNC |
1589                                         CRYPTO_ALG_KERN_DRIVER_ONLY,
1590                         .cra_blocksize = 8,
1591                         .cra_ctxsize = sizeof(struct spacc_ablk_ctx),
1592                         .cra_type = &crypto_ablkcipher_type,
1593                         .cra_module = THIS_MODULE,
1594                         .cra_ablkcipher = {
1595                                 .setkey = spacc_kasumi_f8_setkey,
1596                                 .encrypt = spacc_ablk_encrypt,
1597                                 .decrypt = spacc_ablk_decrypt,
1598                                 .min_keysize = 16,
1599                                 .max_keysize = 16,
1600                                 .ivsize = 8,
1601                         },
1602                         .cra_init = spacc_ablk_cra_init,
1603                         .cra_exit = spacc_ablk_cra_exit,
1604                 },
1605         },
1606 };
1607
1608 #ifdef CONFIG_OF
1609 static const struct of_device_id spacc_of_id_table[] = {
1610         { .compatible = "picochip,spacc-ipsec" },
1611         { .compatible = "picochip,spacc-l2" },
1612         {}
1613 };
1614 MODULE_DEVICE_TABLE(of, spacc_of_id_table);
1615 #endif /* CONFIG_OF */
1616
1617 static bool spacc_is_compatible(struct platform_device *pdev,
1618                                 const char *spacc_type)
1619 {
1620         const struct platform_device_id *platid = platform_get_device_id(pdev);
1621
1622         if (platid && !strcmp(platid->name, spacc_type))
1623                 return true;
1624
1625 #ifdef CONFIG_OF
1626         if (of_device_is_compatible(pdev->dev.of_node, spacc_type))
1627                 return true;
1628 #endif /* CONFIG_OF */
1629
1630         return false;
1631 }
1632
1633 static int spacc_probe(struct platform_device *pdev)
1634 {
1635         int i, err, ret = -EINVAL;
1636         struct resource *mem, *irq;
1637         struct spacc_engine *engine = devm_kzalloc(&pdev->dev, sizeof(*engine),
1638                                                    GFP_KERNEL);
1639         if (!engine)
1640                 return -ENOMEM;
1641
1642         if (spacc_is_compatible(pdev, "picochip,spacc-ipsec")) {
1643                 engine->max_ctxs        = SPACC_CRYPTO_IPSEC_MAX_CTXS;
1644                 engine->cipher_pg_sz    = SPACC_CRYPTO_IPSEC_CIPHER_PG_SZ;
1645                 engine->hash_pg_sz      = SPACC_CRYPTO_IPSEC_HASH_PG_SZ;
1646                 engine->fifo_sz         = SPACC_CRYPTO_IPSEC_FIFO_SZ;
1647                 engine->algs            = ipsec_engine_algs;
1648                 engine->num_algs        = ARRAY_SIZE(ipsec_engine_algs);
1649                 engine->aeads           = ipsec_engine_aeads;
1650                 engine->num_aeads       = ARRAY_SIZE(ipsec_engine_aeads);
1651         } else if (spacc_is_compatible(pdev, "picochip,spacc-l2")) {
1652                 engine->max_ctxs        = SPACC_CRYPTO_L2_MAX_CTXS;
1653                 engine->cipher_pg_sz    = SPACC_CRYPTO_L2_CIPHER_PG_SZ;
1654                 engine->hash_pg_sz      = SPACC_CRYPTO_L2_HASH_PG_SZ;
1655                 engine->fifo_sz         = SPACC_CRYPTO_L2_FIFO_SZ;
1656                 engine->algs            = l2_engine_algs;
1657                 engine->num_algs        = ARRAY_SIZE(l2_engine_algs);
1658         } else {
1659                 return -EINVAL;
1660         }
1661
1662         engine->name = dev_name(&pdev->dev);
1663
1664         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1665         engine->regs = devm_ioremap_resource(&pdev->dev, mem);
1666         if (IS_ERR(engine->regs))
1667                 return PTR_ERR(engine->regs);
1668
1669         irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1670         if (!irq) {
1671                 dev_err(&pdev->dev, "no memory/irq resource for engine\n");
1672                 return -ENXIO;
1673         }
1674
1675         if (devm_request_irq(&pdev->dev, irq->start, spacc_spacc_irq, 0,
1676                              engine->name, engine)) {
1677                 dev_err(engine->dev, "failed to request IRQ\n");
1678                 return -EBUSY;
1679         }
1680
1681         engine->dev             = &pdev->dev;
1682         engine->cipher_ctx_base = engine->regs + SPA_CIPH_KEY_BASE_REG_OFFSET;
1683         engine->hash_key_base   = engine->regs + SPA_HASH_KEY_BASE_REG_OFFSET;
1684
1685         engine->req_pool = dmam_pool_create(engine->name, engine->dev,
1686                 MAX_DDT_LEN * sizeof(struct spacc_ddt), 8, SZ_64K);
1687         if (!engine->req_pool)
1688                 return -ENOMEM;
1689
1690         spin_lock_init(&engine->hw_lock);
1691
1692         engine->clk = clk_get(&pdev->dev, "ref");
1693         if (IS_ERR(engine->clk)) {
1694                 dev_info(&pdev->dev, "clk unavailable\n");
1695                 device_remove_file(&pdev->dev, &dev_attr_stat_irq_thresh);
1696                 return PTR_ERR(engine->clk);
1697         }
1698
1699         if (clk_prepare_enable(engine->clk)) {
1700                 dev_info(&pdev->dev, "unable to prepare/enable clk\n");
1701                 clk_put(engine->clk);
1702                 return -EIO;
1703         }
1704
1705         err = device_create_file(&pdev->dev, &dev_attr_stat_irq_thresh);
1706         if (err) {
1707                 clk_disable_unprepare(engine->clk);
1708                 clk_put(engine->clk);
1709                 return err;
1710         }
1711
1712
1713         /*
1714          * Use an IRQ threshold of 50% as a default. This seems to be a
1715          * reasonable trade off of latency against throughput but can be
1716          * changed at runtime.
1717          */
1718         engine->stat_irq_thresh = (engine->fifo_sz / 2);
1719
1720         /*
1721          * Configure the interrupts. We only use the STAT_CNT interrupt as we
1722          * only submit a new packet for processing when we complete another in
1723          * the queue. This minimizes time spent in the interrupt handler.
1724          */
1725         writel(engine->stat_irq_thresh << SPA_IRQ_CTRL_STAT_CNT_OFFSET,
1726                engine->regs + SPA_IRQ_CTRL_REG_OFFSET);
1727         writel(SPA_IRQ_EN_STAT_EN | SPA_IRQ_EN_GLBL_EN,
1728                engine->regs + SPA_IRQ_EN_REG_OFFSET);
1729
1730         setup_timer(&engine->packet_timeout, spacc_packet_timeout,
1731                     (unsigned long)engine);
1732
1733         INIT_LIST_HEAD(&engine->pending);
1734         INIT_LIST_HEAD(&engine->completed);
1735         INIT_LIST_HEAD(&engine->in_progress);
1736         engine->in_flight = 0;
1737         tasklet_init(&engine->complete, spacc_spacc_complete,
1738                      (unsigned long)engine);
1739
1740         platform_set_drvdata(pdev, engine);
1741
1742         INIT_LIST_HEAD(&engine->registered_algs);
1743         for (i = 0; i < engine->num_algs; ++i) {
1744                 engine->algs[i].engine = engine;
1745                 err = crypto_register_alg(&engine->algs[i].alg);
1746                 if (!err) {
1747                         list_add_tail(&engine->algs[i].entry,
1748                                       &engine->registered_algs);
1749                         ret = 0;
1750                 }
1751                 if (err)
1752                         dev_err(engine->dev, "failed to register alg \"%s\"\n",
1753                                 engine->algs[i].alg.cra_name);
1754                 else
1755                         dev_dbg(engine->dev, "registered alg \"%s\"\n",
1756                                 engine->algs[i].alg.cra_name);
1757         }
1758
1759         INIT_LIST_HEAD(&engine->registered_aeads);
1760         for (i = 0; i < engine->num_aeads; ++i) {
1761                 engine->aeads[i].engine = engine;
1762                 err = crypto_register_aead(&engine->aeads[i].alg);
1763                 if (!err) {
1764                         list_add_tail(&engine->aeads[i].entry,
1765                                       &engine->registered_aeads);
1766                         ret = 0;
1767                 }
1768                 if (err)
1769                         dev_err(engine->dev, "failed to register alg \"%s\"\n",
1770                                 engine->aeads[i].alg.base.cra_name);
1771                 else
1772                         dev_dbg(engine->dev, "registered alg \"%s\"\n",
1773                                 engine->aeads[i].alg.base.cra_name);
1774         }
1775
1776         return ret;
1777 }
1778
1779 static int spacc_remove(struct platform_device *pdev)
1780 {
1781         struct spacc_aead *aead, *an;
1782         struct spacc_alg *alg, *next;
1783         struct spacc_engine *engine = platform_get_drvdata(pdev);
1784
1785         del_timer_sync(&engine->packet_timeout);
1786         device_remove_file(&pdev->dev, &dev_attr_stat_irq_thresh);
1787
1788         list_for_each_entry_safe(aead, an, &engine->registered_aeads, entry) {
1789                 list_del(&aead->entry);
1790                 crypto_unregister_aead(&aead->alg);
1791         }
1792
1793         list_for_each_entry_safe(alg, next, &engine->registered_algs, entry) {
1794                 list_del(&alg->entry);
1795                 crypto_unregister_alg(&alg->alg);
1796         }
1797
1798         clk_disable_unprepare(engine->clk);
1799         clk_put(engine->clk);
1800
1801         return 0;
1802 }
1803
1804 static const struct platform_device_id spacc_id_table[] = {
1805         { "picochip,spacc-ipsec", },
1806         { "picochip,spacc-l2", },
1807         { }
1808 };
1809
1810 static struct platform_driver spacc_driver = {
1811         .probe          = spacc_probe,
1812         .remove         = spacc_remove,
1813         .driver         = {
1814                 .name   = "picochip,spacc",
1815 #ifdef CONFIG_PM
1816                 .pm     = &spacc_pm_ops,
1817 #endif /* CONFIG_PM */
1818                 .of_match_table = of_match_ptr(spacc_of_id_table),
1819         },
1820         .id_table       = spacc_id_table,
1821 };
1822
1823 module_platform_driver(spacc_driver);
1824
1825 MODULE_LICENSE("GPL");
1826 MODULE_AUTHOR("Jamie Iles");