drivers/crypto/picoxcell_crypto.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (c) 2010-2011 Picochip Ltd., Jamie Iles
   4  */
   5 #include <crypto/internal/aead.h>
   6 #include <crypto/aes.h>
   7 #include <crypto/algapi.h>
   8 #include <crypto/authenc.h>
   9 #include <crypto/internal/des.h>
  10 #include <crypto/md5.h>
  11 #include <crypto/sha.h>
  12 #include <crypto/internal/skcipher.h>
  13 #include <linux/clk.h>
  14 #include <linux/crypto.h>
  15 #include <linux/delay.h>
  16 #include <linux/dma-mapping.h>
  17 #include <linux/dmapool.h>
  18 #include <linux/err.h>
  19 #include <linux/init.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/io.h>
  22 #include <linux/list.h>
  23 #include <linux/module.h>
  24 #include <linux/of.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/pm.h>
  27 #include <linux/rtnetlink.h>
  28 #include <linux/scatterlist.h>
  29 #include <linux/sched.h>
  30 #include <linux/sizes.h>
  31 #include <linux/slab.h>
  32 #include <linux/timer.h>
  33
  34 #include "picoxcell_crypto_regs.h"
  35
  36 /*
  37  * The threshold for the number of entries in the CMD FIFO available before
  38  * the CMD0_CNT interrupt is raised. Increasing this value will reduce the
  39  * number of interrupts raised to the CPU.
  40  */
  41 #define CMD0_IRQ_THRESHOLD   1
  42
  43 /*
  44  * The timeout period (in jiffies) for a PDU. When the the number of PDUs in
  45  * flight is greater than the STAT_IRQ_THRESHOLD or 0 the timer is disabled.
  46  * When there are packets in flight but lower than the threshold, we enable
  47  * the timer and at expiry, attempt to remove any processed packets from the
  48  * queue and if there are still packets left, schedule the timer again.
  49  */
  50 #define PACKET_TIMEOUT      1
  51
  52 /* The priority to register each algorithm with. */
  53 #define SPACC_CRYPTO_ALG_PRIORITY       10000
  54
  55 #define SPACC_CRYPTO_KASUMI_F8_KEY_LEN  16
  56 #define SPACC_CRYPTO_IPSEC_CIPHER_PG_SZ 64
  57 #define SPACC_CRYPTO_IPSEC_HASH_PG_SZ   64
  58 #define SPACC_CRYPTO_IPSEC_MAX_CTXS     32
  59 #define SPACC_CRYPTO_IPSEC_FIFO_SZ      32
  60 #define SPACC_CRYPTO_L2_CIPHER_PG_SZ    64
  61 #define SPACC_CRYPTO_L2_HASH_PG_SZ      64
  62 #define SPACC_CRYPTO_L2_MAX_CTXS        128
  63 #define SPACC_CRYPTO_L2_FIFO_SZ         128
  64
  65 #define MAX_DDT_LEN                     16
  66
  67 /* DDT format. This must match the hardware DDT format exactly. */
  68 struct spacc_ddt {
  69         dma_addr_t      p;
  70         u32             len;
  71 };
  72
  73 /*
  74  * Asynchronous crypto request structure.
  75  *
  76  * This structure defines a request that is either queued for processing or
  77  * being processed.
  78  */
  79 struct spacc_req {
  80         struct list_head                list;
  81         struct spacc_engine             *engine;
  82         struct crypto_async_request     *req;
  83         int                             result;
  84         bool                            is_encrypt;
  85         unsigned                        ctx_id;
  86         dma_addr_t                      src_addr, dst_addr;
  87         struct spacc_ddt                *src_ddt, *dst_ddt;
  88         void                            (*complete)(struct spacc_req *req);
  89 };
  90
  91 struct spacc_aead {
  92         unsigned long                   ctrl_default;
  93         unsigned long                   type;
  94         struct aead_alg                 alg;
  95         struct spacc_engine             *engine;
  96         struct list_head                entry;
  97         int                             key_offs;
  98         int                             iv_offs;
  99 };
 100
 101 struct spacc_engine {
 102         void __iomem                    *regs;
 103         struct list_head                pending;
 104         int                             next_ctx;
 105         spinlock_t                      hw_lock;
 106         int                             in_flight;
 107         struct list_head                completed;
 108         struct list_head                in_progress;
 109         struct tasklet_struct           complete;
 110         unsigned long                   fifo_sz;
 111         void __iomem                    *cipher_ctx_base;
 112         void __iomem                    *hash_key_base;
 113         struct spacc_alg                *algs;
 114         unsigned                        num_algs;
 115         struct list_head                registered_algs;
 116         struct spacc_aead               *aeads;
 117         unsigned                        num_aeads;
 118         struct list_head                registered_aeads;
 119         size_t                          cipher_pg_sz;
 120         size_t                          hash_pg_sz;
 121         const char                      *name;
 122         struct clk                      *clk;
 123         struct device                   *dev;
 124         unsigned                        max_ctxs;
 125         struct timer_list               packet_timeout;
 126         unsigned                        stat_irq_thresh;
 127         struct dma_pool                 *req_pool;
 128 };
 129
 130 /* Algorithm type mask. */
 131 #define SPACC_CRYPTO_ALG_MASK           0x7
 132
 133 /* SPACC definition of a crypto algorithm. */
 134 struct spacc_alg {
 135         unsigned long                   ctrl_default;
 136         unsigned long                   type;
 137         struct skcipher_alg             alg;
 138         struct spacc_engine             *engine;
 139         struct list_head                entry;
 140         int                             key_offs;
 141         int                             iv_offs;
 142 };
 143
 144 /* Generic context structure for any algorithm type. */
 145 struct spacc_generic_ctx {
 146         struct spacc_engine             *engine;
 147         int                             flags;
 148         int                             key_offs;
 149         int                             iv_offs;
 150 };
 151
 152 /* Block cipher context. */
 153 struct spacc_ablk_ctx {
 154         struct spacc_generic_ctx        generic;
 155         u8                              key[AES_MAX_KEY_SIZE];
 156         u8                              key_len;
 157         /*
 158          * The fallback cipher. If the operation can't be done in hardware,
 159          * fallback to a software version.
 160          */
 161         struct crypto_sync_skcipher     *sw_cipher;
 162 };
 163
 164 /* AEAD cipher context. */
 165 struct spacc_aead_ctx {
 166         struct spacc_generic_ctx        generic;
 167         u8                              cipher_key[AES_MAX_KEY_SIZE];
 168         u8                              hash_ctx[SPACC_CRYPTO_IPSEC_HASH_PG_SZ];
 169         u8                              cipher_key_len;
 170         u8                              hash_key_len;
 171         struct crypto_aead              *sw_cipher;
 172 };
 173
 174 static int spacc_ablk_submit(struct spacc_req *req);
 175
 176 static inline struct spacc_alg *to_spacc_skcipher(struct skcipher_alg *alg)
 177 {
 178         return alg ? container_of(alg, struct spacc_alg, alg) : NULL;
 179 }
 180
 181 static inline struct spacc_aead *to_spacc_aead(struct aead_alg *alg)
 182 {
 183         return container_of(alg, struct spacc_aead, alg);
 184 }
 185
 186 static inline int spacc_fifo_cmd_full(struct spacc_engine *engine)
 187 {
 188         u32 fifo_stat = readl(engine->regs + SPA_FIFO_STAT_REG_OFFSET);
 189
 190         return fifo_stat & SPA_FIFO_CMD_FULL;
 191 }
 192
 193 /*
 194  * Given a cipher context, and a context number, get the base address of the
 195  * context page.
 196  *
 197  * Returns the address of the context page where the key/context may
 198  * be written.
 199  */
 200 static inline void __iomem *spacc_ctx_page_addr(struct spacc_generic_ctx *ctx,
 201                                                 unsigned indx,
 202                                                 bool is_cipher_ctx)
 203 {
 204         return is_cipher_ctx ? ctx->engine->cipher_ctx_base +
 205                         (indx * ctx->engine->cipher_pg_sz) :
 206                 ctx->engine->hash_key_base + (indx * ctx->engine->hash_pg_sz);
 207 }
 208
 209 /* The context pages can only be written with 32-bit accesses. */
 210 static inline void memcpy_toio32(u32 __iomem *dst, const void *src,
 211                                  unsigned count)
 212 {
 213         const u32 *src32 = (const u32 *) src;
 214
 215         while (count--)
 216                 writel(*src32++, dst++);
 217 }
 218
 219 static void spacc_cipher_write_ctx(struct spacc_generic_ctx *ctx,
 220                                    void __iomem *page_addr, const u8 *key,
 221                                    size_t key_len, const u8 *iv, size_t iv_len)
 222 {
 223         void __iomem *key_ptr = page_addr + ctx->key_offs;
 224         void __iomem *iv_ptr = page_addr + ctx->iv_offs;
 225
 226         memcpy_toio32(key_ptr, key, key_len / 4);
 227         memcpy_toio32(iv_ptr, iv, iv_len / 4);
 228 }
 229
 230 /*
 231  * Load a context into the engines context memory.
 232  *
 233  * Returns the index of the context page where the context was loaded.
 234  */
 235 static unsigned spacc_load_ctx(struct spacc_generic_ctx *ctx,
 236                                const u8 *ciph_key, size_t ciph_len,
 237                                const u8 *iv, size_t ivlen, const u8 *hash_key,
 238                                size_t hash_len)
 239 {
 240         unsigned indx = ctx->engine->next_ctx++;
 241         void __iomem *ciph_page_addr, *hash_page_addr;
 242
 243         ciph_page_addr = spacc_ctx_page_addr(ctx, indx, 1);
 244         hash_page_addr = spacc_ctx_page_addr(ctx, indx, 0);
 245
 246         ctx->engine->next_ctx &= ctx->engine->fifo_sz - 1;
 247         spacc_cipher_write_ctx(ctx, ciph_page_addr, ciph_key, ciph_len, iv,
 248                                ivlen);
 249         writel(ciph_len | (indx << SPA_KEY_SZ_CTX_INDEX_OFFSET) |
 250                (1 << SPA_KEY_SZ_CIPHER_OFFSET),
 251                ctx->engine->regs + SPA_KEY_SZ_REG_OFFSET);
 252
 253         if (hash_key) {
 254                 memcpy_toio32(hash_page_addr, hash_key, hash_len / 4);
 255                 writel(hash_len | (indx << SPA_KEY_SZ_CTX_INDEX_OFFSET),
 256                        ctx->engine->regs + SPA_KEY_SZ_REG_OFFSET);
 257         }
 258
 259         return indx;
 260 }
 261
 262 static inline void ddt_set(struct spacc_ddt *ddt, dma_addr_t phys, size_t len)
 263 {
 264         ddt->p = phys;
 265         ddt->len = len;
 266 }
 267
 268 /*
 269  * Take a crypto request and scatterlists for the data and turn them into DDTs
 270  * for passing to the crypto engines. This also DMA maps the data so that the
 271  * crypto engines can DMA to/from them.
 272  */
 273 static struct spacc_ddt *spacc_sg_to_ddt(struct spacc_engine *engine,
 274                                          struct scatterlist *payload,
 275                                          unsigned nbytes,
 276                                          enum dma_data_direction dir,
 277                                          dma_addr_t *ddt_phys)
 278 {
 279         unsigned mapped_ents;
 280         struct scatterlist *cur;
 281         struct spacc_ddt *ddt;
 282         int i;
 283         int nents;
 284
 285         nents = sg_nents_for_len(payload, nbytes);
 286         if (nents < 0) {
 287                 dev_err(engine->dev, "Invalid numbers of SG.\n");
 288                 return NULL;
 289         }
 290         mapped_ents = dma_map_sg(engine->dev, payload, nents, dir);
 291
 292         if (mapped_ents + 1 > MAX_DDT_LEN)
 293                 goto out;
 294
 295         ddt = dma_pool_alloc(engine->req_pool, GFP_ATOMIC, ddt_phys);
 296         if (!ddt)
 297                 goto out;
 298
 299         for_each_sg(payload, cur, mapped_ents, i)
 300                 ddt_set(&ddt[i], sg_dma_address(cur), sg_dma_len(cur));
 301         ddt_set(&ddt[mapped_ents], 0, 0);
 302
 303         return ddt;
 304
 305 out:
 306         dma_unmap_sg(engine->dev, payload, nents, dir);
 307         return NULL;
 308 }
 309
 310 static int spacc_aead_make_ddts(struct aead_request *areq)
 311 {
 312         struct crypto_aead *aead = crypto_aead_reqtfm(areq);
 313         struct spacc_req *req = aead_request_ctx(areq);
 314         struct spacc_engine *engine = req->engine;
 315         struct spacc_ddt *src_ddt, *dst_ddt;
 316         unsigned total;
 317         int src_nents, dst_nents;
 318         struct scatterlist *cur;
 319         int i, dst_ents, src_ents;
 320
 321         total = areq->assoclen + areq->cryptlen;
 322         if (req->is_encrypt)
 323                 total += crypto_aead_authsize(aead);
 324
 325         src_nents = sg_nents_for_len(areq->src, total);
 326         if (src_nents < 0) {
 327                 dev_err(engine->dev, "Invalid numbers of src SG.\n");
 328                 return src_nents;
 329         }
 330         if (src_nents + 1 > MAX_DDT_LEN)
 331                 return -E2BIG;
 332
 333         dst_nents = 0;
 334         if (areq->src != areq->dst) {
 335                 dst_nents = sg_nents_for_len(areq->dst, total);
 336                 if (dst_nents < 0) {
 337                         dev_err(engine->dev, "Invalid numbers of dst SG.\n");
 338                         return dst_nents;
 339                 }
 340                 if (src_nents + 1 > MAX_DDT_LEN)
 341                         return -E2BIG;
 342         }
 343
 344         src_ddt = dma_pool_alloc(engine->req_pool, GFP_ATOMIC, &req->src_addr);
 345         if (!src_ddt)
 346                 goto err;
 347
 348         dst_ddt = dma_pool_alloc(engine->req_pool, GFP_ATOMIC, &req->dst_addr);
 349         if (!dst_ddt)
 350                 goto err_free_src;
 351
 352         req->src_ddt = src_ddt;
 353         req->dst_ddt = dst_ddt;
 354
 355         if (dst_nents) {
 356                 src_ents = dma_map_sg(engine->dev, areq->src, src_nents,
 357                                       DMA_TO_DEVICE);
 358                 if (!src_ents)
 359                         goto err_free_dst;
 360
 361                 dst_ents = dma_map_sg(engine->dev, areq->dst, dst_nents,
 362                                       DMA_FROM_DEVICE);
 363
 364                 if (!dst_ents) {
 365                         dma_unmap_sg(engine->dev, areq->src, src_nents,
 366                                      DMA_TO_DEVICE);
 367                         goto err_free_dst;
 368                 }
 369         } else {
 370                 src_ents = dma_map_sg(engine->dev, areq->src, src_nents,
 371                                       DMA_BIDIRECTIONAL);
 372                 if (!src_ents)
 373                         goto err_free_dst;
 374                 dst_ents = src_ents;
 375         }
 376
 377         /*
 378          * Now map in the payload for the source and destination and terminate
 379          * with the NULL pointers.
 380          */
 381         for_each_sg(areq->src, cur, src_ents, i)
 382                 ddt_set(src_ddt++, sg_dma_address(cur), sg_dma_len(cur));
 383
 384         /* For decryption we need to skip the associated data. */
 385         total = req->is_encrypt ? 0 : areq->assoclen;
 386         for_each_sg(areq->dst, cur, dst_ents, i) {
 387                 unsigned len = sg_dma_len(cur);
 388
 389                 if (len <= total) {
 390                         total -= len;
 391                         continue;
 392                 }
 393
 394                 ddt_set(dst_ddt++, sg_dma_address(cur) + total, len - total);
 395         }
 396
 397         ddt_set(src_ddt, 0, 0);
 398         ddt_set(dst_ddt, 0, 0);
 399
 400         return 0;
 401
 402 err_free_dst:
 403         dma_pool_free(engine->req_pool, dst_ddt, req->dst_addr);
 404 err_free_src:
 405         dma_pool_free(engine->req_pool, src_ddt, req->src_addr);
 406 err:
 407         return -ENOMEM;
 408 }
 409
 410 static void spacc_aead_free_ddts(struct spacc_req *req)
 411 {
 412         struct aead_request *areq = container_of(req->req, struct aead_request,
 413                                                  base);
 414         struct crypto_aead *aead = crypto_aead_reqtfm(areq);
 415         unsigned total = areq->assoclen + areq->cryptlen +
 416                          (req->is_encrypt ? crypto_aead_authsize(aead) : 0);
 417         struct spacc_aead_ctx *aead_ctx = crypto_aead_ctx(aead);
 418         struct spacc_engine *engine = aead_ctx->generic.engine;
 419         int nents = sg_nents_for_len(areq->src, total);
 420
 421         /* sg_nents_for_len should not fail since it works when mapping sg */
 422         if (unlikely(nents < 0)) {
 423                 dev_err(engine->dev, "Invalid numbers of src SG.\n");
 424                 return;
 425         }
 426
 427         if (areq->src != areq->dst) {
 428                 dma_unmap_sg(engine->dev, areq->src, nents, DMA_TO_DEVICE);
 429                 nents = sg_nents_for_len(areq->dst, total);
 430                 if (unlikely(nents < 0)) {
 431                         dev_err(engine->dev, "Invalid numbers of dst SG.\n");
 432                         return;
 433                 }
 434                 dma_unmap_sg(engine->dev, areq->dst, nents, DMA_FROM_DEVICE);
 435         } else
 436                 dma_unmap_sg(engine->dev, areq->src, nents, DMA_BIDIRECTIONAL);
 437
 438         dma_pool_free(engine->req_pool, req->src_ddt, req->src_addr);
 439         dma_pool_free(engine->req_pool, req->dst_ddt, req->dst_addr);
 440 }
 441
 442 static void spacc_free_ddt(struct spacc_req *req, struct spacc_ddt *ddt,
 443                            dma_addr_t ddt_addr, struct scatterlist *payload,
 444                            unsigned nbytes, enum dma_data_direction dir)
 445 {
 446         int nents = sg_nents_for_len(payload, nbytes);
 447
 448         if (nents < 0) {
 449                 dev_err(req->engine->dev, "Invalid numbers of SG.\n");
 450                 return;
 451         }
 452
 453         dma_unmap_sg(req->engine->dev, payload, nents, dir);
 454         dma_pool_free(req->engine->req_pool, ddt, ddt_addr);
 455 }
 456
 457 static int spacc_aead_setkey(struct crypto_aead *tfm, const u8 *key,
 458                              unsigned int keylen)
 459 {
 460         struct spacc_aead_ctx *ctx = crypto_aead_ctx(tfm);
 461         struct crypto_authenc_keys keys;
 462         int err;
 463
 464         crypto_aead_clear_flags(ctx->sw_cipher, CRYPTO_TFM_REQ_MASK);
 465         crypto_aead_set_flags(ctx->sw_cipher, crypto_aead_get_flags(tfm) &
 466                                               CRYPTO_TFM_REQ_MASK);
 467         err = crypto_aead_setkey(ctx->sw_cipher, key, keylen);
 468         crypto_aead_clear_flags(tfm, CRYPTO_TFM_RES_MASK);
 469         crypto_aead_set_flags(tfm, crypto_aead_get_flags(ctx->sw_cipher) &
 470                                    CRYPTO_TFM_RES_MASK);
 471         if (err)
 472                 return err;
 473
 474         if (crypto_authenc_extractkeys(&keys, key, keylen) != 0)
 475                 goto badkey;
 476
 477         if (keys.enckeylen > AES_MAX_KEY_SIZE)
 478                 goto badkey;
 479
 480         if (keys.authkeylen > sizeof(ctx->hash_ctx))
 481                 goto badkey;
 482
 483         memcpy(ctx->cipher_key, keys.enckey, keys.enckeylen);
 484         ctx->cipher_key_len = keys.enckeylen;
 485
 486         memcpy(ctx->hash_ctx, keys.authkey, keys.authkeylen);
 487         ctx->hash_key_len = keys.authkeylen;
 488
 489         memzero_explicit(&keys, sizeof(keys));
 490         return 0;
 491
 492 badkey:
 493         crypto_aead_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
 494         memzero_explicit(&keys, sizeof(keys));
 495         return -EINVAL;
 496 }
 497
 498 static int spacc_aead_setauthsize(struct crypto_aead *tfm,
 499                                   unsigned int authsize)
 500 {
 501         struct spacc_aead_ctx *ctx = crypto_tfm_ctx(crypto_aead_tfm(tfm));
 502
 503         return crypto_aead_setauthsize(ctx->sw_cipher, authsize);
 504 }
 505
 506 /*
 507  * Check if an AEAD request requires a fallback operation. Some requests can't
 508  * be completed in hardware because the hardware may not support certain key
 509  * sizes. In these cases we need to complete the request in software.
 510  */
 511 static int spacc_aead_need_fallback(struct aead_request *aead_req)
 512 {
 513         struct crypto_aead *aead = crypto_aead_reqtfm(aead_req);
 514         struct aead_alg *alg = crypto_aead_alg(aead);
 515         struct spacc_aead *spacc_alg = to_spacc_aead(alg);
 516         struct spacc_aead_ctx *ctx = crypto_aead_ctx(aead);
 517
 518         /*
 519          * If we have a non-supported key-length, then we need to do a
 520          * software fallback.
 521          */
 522         if ((spacc_alg->ctrl_default & SPACC_CRYPTO_ALG_MASK) ==
 523             SPA_CTRL_CIPH_ALG_AES &&
 524             ctx->cipher_key_len != AES_KEYSIZE_128 &&
 525             ctx->cipher_key_len != AES_KEYSIZE_256)
 526                 return 1;
 527
 528         return 0;
 529 }
 530
 531 static int spacc_aead_do_fallback(struct aead_request *req, unsigned alg_type,
 532                                   bool is_encrypt)
 533 {
 534         struct crypto_tfm *old_tfm = crypto_aead_tfm(crypto_aead_reqtfm(req));
 535         struct spacc_aead_ctx *ctx = crypto_tfm_ctx(old_tfm);
 536         struct aead_request *subreq = aead_request_ctx(req);
 537
 538         aead_request_set_tfm(subreq, ctx->sw_cipher);
 539         aead_request_set_callback(subreq, req->base.flags,
 540                                   req->base.complete, req->base.data);
 541         aead_request_set_crypt(subreq, req->src, req->dst, req->cryptlen,
 542                                req->iv);
 543         aead_request_set_ad(subreq, req->assoclen);
 544
 545         return is_encrypt ? crypto_aead_encrypt(subreq) :
 546                             crypto_aead_decrypt(subreq);
 547 }
 548
 549 static void spacc_aead_complete(struct spacc_req *req)
 550 {
 551         spacc_aead_free_ddts(req);
 552         req->req->complete(req->req, req->result);
 553 }
 554
 555 static int spacc_aead_submit(struct spacc_req *req)
 556 {
 557         struct aead_request *aead_req =
 558                 container_of(req->req, struct aead_request, base);
 559         struct crypto_aead *aead = crypto_aead_reqtfm(aead_req);
 560         unsigned int authsize = crypto_aead_authsize(aead);
 561         struct spacc_aead_ctx *ctx = crypto_aead_ctx(aead);
 562         struct aead_alg *alg = crypto_aead_alg(aead);
 563         struct spacc_aead *spacc_alg = to_spacc_aead(alg);
 564         struct spacc_engine *engine = ctx->generic.engine;
 565         u32 ctrl, proc_len, assoc_len;
 566
 567         req->result = -EINPROGRESS;
 568         req->ctx_id = spacc_load_ctx(&ctx->generic, ctx->cipher_key,
 569                 ctx->cipher_key_len, aead_req->iv, crypto_aead_ivsize(aead),
 570                 ctx->hash_ctx, ctx->hash_key_len);
 571
 572         /* Set the source and destination DDT pointers. */
 573         writel(req->src_addr, engine->regs + SPA_SRC_PTR_REG_OFFSET);
 574         writel(req->dst_addr, engine->regs + SPA_DST_PTR_REG_OFFSET);
 575         writel(0, engine->regs + SPA_OFFSET_REG_OFFSET);
 576
 577         assoc_len = aead_req->assoclen;
 578         proc_len = aead_req->cryptlen + assoc_len;
 579
 580         /*
 581          * If we are decrypting, we need to take the length of the ICV out of
 582          * the processing length.
 583          */
 584         if (!req->is_encrypt)
 585                 proc_len -= authsize;
 586
 587         writel(proc_len, engine->regs + SPA_PROC_LEN_REG_OFFSET);
 588         writel(assoc_len, engine->regs + SPA_AAD_LEN_REG_OFFSET);
 589         writel(authsize, engine->regs + SPA_ICV_LEN_REG_OFFSET);
 590         writel(0, engine->regs + SPA_ICV_OFFSET_REG_OFFSET);
 591         writel(0, engine->regs + SPA_AUX_INFO_REG_OFFSET);
 592
 593         ctrl = spacc_alg->ctrl_default | (req->ctx_id << SPA_CTRL_CTX_IDX) |
 594                 (1 << SPA_CTRL_ICV_APPEND);
 595         if (req->is_encrypt)
 596                 ctrl |= (1 << SPA_CTRL_ENCRYPT_IDX) | (1 << SPA_CTRL_AAD_COPY);
 597         else
 598                 ctrl |= (1 << SPA_CTRL_KEY_EXP);
 599
 600         mod_timer(&engine->packet_timeout, jiffies + PACKET_TIMEOUT);
 601
 602         writel(ctrl, engine->regs + SPA_CTRL_REG_OFFSET);
 603
 604         return -EINPROGRESS;
 605 }
 606
 607 static int spacc_req_submit(struct spacc_req *req);
 608
 609 static void spacc_push(struct spacc_engine *engine)
 610 {
 611         struct spacc_req *req;
 612
 613         while (!list_empty(&engine->pending) &&
 614                engine->in_flight + 1 <= engine->fifo_sz) {
 615
 616                 ++engine->in_flight;
 617                 req = list_first_entry(&engine->pending, struct spacc_req,
 618                                        list);
 619                 list_move_tail(&req->list, &engine->in_progress);
 620
 621                 req->result = spacc_req_submit(req);
 622         }
 623 }
 624
 625 /*
 626  * Setup an AEAD request for processing. This will configure the engine, load
 627  * the context and then start the packet processing.
 628  */
 629 static int spacc_aead_setup(struct aead_request *req,
 630                             unsigned alg_type, bool is_encrypt)
 631 {
 632         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 633         struct aead_alg *alg = crypto_aead_alg(aead);
 634         struct spacc_engine *engine = to_spacc_aead(alg)->engine;
 635         struct spacc_req *dev_req = aead_request_ctx(req);
 636         int err;
 637         unsigned long flags;
 638
 639         dev_req->req            = &req->base;
 640         dev_req->is_encrypt     = is_encrypt;
 641         dev_req->result         = -EBUSY;
 642         dev_req->engine         = engine;
 643         dev_req->complete       = spacc_aead_complete;
 644
 645         if (unlikely(spacc_aead_need_fallback(req) ||
 646                      ((err = spacc_aead_make_ddts(req)) == -E2BIG)))
 647                 return spacc_aead_do_fallback(req, alg_type, is_encrypt);
 648
 649         if (err)
 650                 goto out;
 651
 652         err = -EINPROGRESS;
 653         spin_lock_irqsave(&engine->hw_lock, flags);
 654         if (unlikely(spacc_fifo_cmd_full(engine)) ||
 655             engine->in_flight + 1 > engine->fifo_sz) {
 656                 if (!(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
 657                         err = -EBUSY;
 658                         spin_unlock_irqrestore(&engine->hw_lock, flags);
 659                         goto out_free_ddts;
 660                 }
 661                 list_add_tail(&dev_req->list, &engine->pending);
 662         } else {
 663                 list_add_tail(&dev_req->list, &engine->pending);
 664                 spacc_push(engine);
 665         }
 666         spin_unlock_irqrestore(&engine->hw_lock, flags);
 667
 668         goto out;
 669
 670 out_free_ddts:
 671         spacc_aead_free_ddts(dev_req);
 672 out:
 673         return err;
 674 }
 675
 676 static int spacc_aead_encrypt(struct aead_request *req)
 677 {
 678         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 679         struct spacc_aead *alg = to_spacc_aead(crypto_aead_alg(aead));
 680
 681         return spacc_aead_setup(req, alg->type, 1);
 682 }
 683
 684 static int spacc_aead_decrypt(struct aead_request *req)
 685 {
 686         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 687         struct spacc_aead  *alg = to_spacc_aead(crypto_aead_alg(aead));
 688
 689         return spacc_aead_setup(req, alg->type, 0);
 690 }
 691
 692 /*
 693  * Initialise a new AEAD context. This is responsible for allocating the
 694  * fallback cipher and initialising the context.
 695  */
 696 static int spacc_aead_cra_init(struct crypto_aead *tfm)
 697 {
 698         struct spacc_aead_ctx *ctx = crypto_aead_ctx(tfm);
 699         struct aead_alg *alg = crypto_aead_alg(tfm);
 700         struct spacc_aead *spacc_alg = to_spacc_aead(alg);
 701         struct spacc_engine *engine = spacc_alg->engine;
 702
 703         ctx->generic.flags = spacc_alg->type;
 704         ctx->generic.engine = engine;
 705         ctx->sw_cipher = crypto_alloc_aead(alg->base.cra_name, 0,
 706                                            CRYPTO_ALG_NEED_FALLBACK);
 707         if (IS_ERR(ctx->sw_cipher))
 708                 return PTR_ERR(ctx->sw_cipher);
 709         ctx->generic.key_offs = spacc_alg->key_offs;
 710         ctx->generic.iv_offs = spacc_alg->iv_offs;
 711
 712         crypto_aead_set_reqsize(
 713                 tfm,
 714                 max(sizeof(struct spacc_req),
 715                     sizeof(struct aead_request) +
 716                     crypto_aead_reqsize(ctx->sw_cipher)));
 717
 718         return 0;
 719 }
 720
 721 /*
 722  * Destructor for an AEAD context. This is called when the transform is freed
 723  * and must free the fallback cipher.
 724  */
 725 static void spacc_aead_cra_exit(struct crypto_aead *tfm)
 726 {
 727         struct spacc_aead_ctx *ctx = crypto_aead_ctx(tfm);
 728
 729         crypto_free_aead(ctx->sw_cipher);
 730 }
 731
 732 /*
 733  * Set the DES key for a block cipher transform. This also performs weak key
 734  * checking if the transform has requested it.
 735  */
 736 static int spacc_des_setkey(struct crypto_skcipher *cipher, const u8 *key,
 737                             unsigned int len)
 738 {
 739         struct spacc_ablk_ctx *ctx = crypto_skcipher_ctx(cipher);
 740         int err;
 741
 742         err = verify_skcipher_des_key(cipher, key);
 743         if (err)
 744                 return err;
 745
 746         memcpy(ctx->key, key, len);
 747         ctx->key_len = len;
 748
 749         return 0;
 750 }
 751
 752 /*
 753  * Set the 3DES key for a block cipher transform. This also performs weak key
 754  * checking if the transform has requested it.
 755  */
 756 static int spacc_des3_setkey(struct crypto_skcipher *cipher, const u8 *key,
 757                              unsigned int len)
 758 {
 759         struct spacc_ablk_ctx *ctx = crypto_skcipher_ctx(cipher);
 760         int err;
 761
 762         err = verify_skcipher_des3_key(cipher, key);
 763         if (err)
 764                 return err;
 765
 766         memcpy(ctx->key, key, len);
 767         ctx->key_len = len;
 768
 769         return 0;
 770 }
 771
 772 /*
 773  * Set the key for an AES block cipher. Some key lengths are not supported in
 774  * hardware so this must also check whether a fallback is needed.
 775  */
 776 static int spacc_aes_setkey(struct crypto_skcipher *cipher, const u8 *key,
 777                             unsigned int len)
 778 {
 779         struct crypto_tfm *tfm = crypto_skcipher_tfm(cipher);
 780         struct spacc_ablk_ctx *ctx = crypto_tfm_ctx(tfm);
 781         int err = 0;
 782
 783         if (len > AES_MAX_KEY_SIZE) {
 784                 crypto_skcipher_set_flags(cipher, CRYPTO_TFM_RES_BAD_KEY_LEN);
 785                 return -EINVAL;
 786         }
 787
 788         /*
 789          * IPSec engine only supports 128 and 256 bit AES keys. If we get a
 790          * request for any other size (192 bits) then we need to do a software
 791          * fallback.
 792          */
 793         if (len != AES_KEYSIZE_128 && len != AES_KEYSIZE_256) {
 794                 if (!ctx->sw_cipher)
 795                         return -EINVAL;
 796
 797                 /*
 798                  * Set the fallback transform to use the same request flags as
 799                  * the hardware transform.
 800                  */
 801                 crypto_sync_skcipher_clear_flags(ctx->sw_cipher,
 802                                             CRYPTO_TFM_REQ_MASK);
 803                 crypto_sync_skcipher_set_flags(ctx->sw_cipher,
 804                                           cipher->base.crt_flags &
 805                                           CRYPTO_TFM_REQ_MASK);
 806
 807                 err = crypto_sync_skcipher_setkey(ctx->sw_cipher, key, len);
 808
 809                 tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
 810                 tfm->crt_flags |=
 811                         crypto_sync_skcipher_get_flags(ctx->sw_cipher) &
 812                         CRYPTO_TFM_RES_MASK;
 813
 814                 if (err)
 815                         goto sw_setkey_failed;
 816         }
 817
 818         memcpy(ctx->key, key, len);
 819         ctx->key_len = len;
 820
 821 sw_setkey_failed:
 822         return err;
 823 }
 824
 825 static int spacc_kasumi_f8_setkey(struct crypto_skcipher *cipher,
 826                                   const u8 *key, unsigned int len)
 827 {
 828         struct crypto_tfm *tfm = crypto_skcipher_tfm(cipher);
 829         struct spacc_ablk_ctx *ctx = crypto_tfm_ctx(tfm);
 830         int err = 0;
 831
 832         if (len > AES_MAX_KEY_SIZE) {
 833                 crypto_skcipher_set_flags(cipher, CRYPTO_TFM_RES_BAD_KEY_LEN);
 834                 err = -EINVAL;
 835                 goto out;
 836         }
 837
 838         memcpy(ctx->key, key, len);
 839         ctx->key_len = len;
 840
 841 out:
 842         return err;
 843 }
 844
 845 static int spacc_ablk_need_fallback(struct spacc_req *req)
 846 {
 847         struct skcipher_request *ablk_req = skcipher_request_cast(req->req);
 848         struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(ablk_req);
 849         struct spacc_alg *spacc_alg = to_spacc_skcipher(crypto_skcipher_alg(tfm));
 850         struct spacc_ablk_ctx *ctx;
 851
 852         ctx = crypto_skcipher_ctx(tfm);
 853
 854         return (spacc_alg->ctrl_default & SPACC_CRYPTO_ALG_MASK) ==
 855                         SPA_CTRL_CIPH_ALG_AES &&
 856                         ctx->key_len != AES_KEYSIZE_128 &&
 857                         ctx->key_len != AES_KEYSIZE_256;
 858 }
 859
 860 static void spacc_ablk_complete(struct spacc_req *req)
 861 {
 862         struct skcipher_request *ablk_req = skcipher_request_cast(req->req);
 863
 864         if (ablk_req->src != ablk_req->dst) {
 865                 spacc_free_ddt(req, req->src_ddt, req->src_addr, ablk_req->src,
 866                                ablk_req->cryptlen, DMA_TO_DEVICE);
 867                 spacc_free_ddt(req, req->dst_ddt, req->dst_addr, ablk_req->dst,
 868                                ablk_req->cryptlen, DMA_FROM_DEVICE);
 869         } else
 870                 spacc_free_ddt(req, req->dst_ddt, req->dst_addr, ablk_req->dst,
 871                                ablk_req->cryptlen, DMA_BIDIRECTIONAL);
 872
 873         req->req->complete(req->req, req->result);
 874 }
 875
 876 static int spacc_ablk_submit(struct spacc_req *req)
 877 {
 878         struct skcipher_request *ablk_req = skcipher_request_cast(req->req);
 879         struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(ablk_req);
 880         struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
 881         struct spacc_alg *spacc_alg = to_spacc_skcipher(alg);
 882         struct spacc_ablk_ctx *ctx = crypto_skcipher_ctx(tfm);
 883         struct spacc_engine *engine = ctx->generic.engine;
 884         u32 ctrl;
 885
 886         req->ctx_id = spacc_load_ctx(&ctx->generic, ctx->key,
 887                 ctx->key_len, ablk_req->iv, alg->ivsize,
 888                 NULL, 0);
 889
 890         writel(req->src_addr, engine->regs + SPA_SRC_PTR_REG_OFFSET);
 891         writel(req->dst_addr, engine->regs + SPA_DST_PTR_REG_OFFSET);
 892         writel(0, engine->regs + SPA_OFFSET_REG_OFFSET);
 893
 894         writel(ablk_req->cryptlen, engine->regs + SPA_PROC_LEN_REG_OFFSET);
 895         writel(0, engine->regs + SPA_ICV_OFFSET_REG_OFFSET);
 896         writel(0, engine->regs + SPA_AUX_INFO_REG_OFFSET);
 897         writel(0, engine->regs + SPA_AAD_LEN_REG_OFFSET);
 898
 899         ctrl = spacc_alg->ctrl_default | (req->ctx_id << SPA_CTRL_CTX_IDX) |
 900                 (req->is_encrypt ? (1 << SPA_CTRL_ENCRYPT_IDX) :
 901                  (1 << SPA_CTRL_KEY_EXP));
 902
 903         mod_timer(&engine->packet_timeout, jiffies + PACKET_TIMEOUT);
 904
 905         writel(ctrl, engine->regs + SPA_CTRL_REG_OFFSET);
 906
 907         return -EINPROGRESS;
 908 }
 909
 910 static int spacc_ablk_do_fallback(struct skcipher_request *req,
 911                                   unsigned alg_type, bool is_encrypt)
 912 {
 913         struct crypto_tfm *old_tfm =
 914             crypto_skcipher_tfm(crypto_skcipher_reqtfm(req));
 915         struct spacc_ablk_ctx *ctx = crypto_tfm_ctx(old_tfm);
 916         SYNC_SKCIPHER_REQUEST_ON_STACK(subreq, ctx->sw_cipher);
 917         int err;
 918
 919         /*
 920          * Change the request to use the software fallback transform, and once
 921          * the ciphering has completed, put the old transform back into the
 922          * request.
 923          */
 924         skcipher_request_set_sync_tfm(subreq, ctx->sw_cipher);
 925         skcipher_request_set_callback(subreq, req->base.flags, NULL, NULL);
 926         skcipher_request_set_crypt(subreq, req->src, req->dst,
 927                                    req->cryptlen, req->iv);
 928         err = is_encrypt ? crypto_skcipher_encrypt(subreq) :
 929                            crypto_skcipher_decrypt(subreq);
 930         skcipher_request_zero(subreq);
 931
 932         return err;
 933 }
 934
 935 static int spacc_ablk_setup(struct skcipher_request *req, unsigned alg_type,
 936                             bool is_encrypt)
 937 {
 938         struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 939         struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
 940         struct spacc_engine *engine = to_spacc_skcipher(alg)->engine;
 941         struct spacc_req *dev_req = skcipher_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->cryptlen, 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->cryptlen, 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->cryptlen, 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->cryptlen, 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->cryptlen, DMA_TO_DEVICE);
1009 out:
1010         return err;
1011 }
1012
1013 static int spacc_ablk_init_tfm(struct crypto_skcipher *tfm)
1014 {
1015         struct spacc_ablk_ctx *ctx = crypto_skcipher_ctx(tfm);
1016         struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
1017         struct spacc_alg *spacc_alg = to_spacc_skcipher(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->base.cra_flags & CRYPTO_ALG_NEED_FALLBACK) {
1023                 ctx->sw_cipher = crypto_alloc_sync_skcipher(
1024                         alg->base.cra_name, 0, CRYPTO_ALG_NEED_FALLBACK);
1025                 if (IS_ERR(ctx->sw_cipher)) {
1026                         dev_warn(engine->dev, "failed to allocate fallback for %s\n",
1027                                  alg->base.cra_name);
1028                         return PTR_ERR(ctx->sw_cipher);
1029                 }
1030         }
1031         ctx->generic.key_offs = spacc_alg->key_offs;
1032         ctx->generic.iv_offs = spacc_alg->iv_offs;
1033
1034         crypto_skcipher_set_reqsize(tfm, sizeof(struct spacc_req));
1035
1036         return 0;
1037 }
1038
1039 static void spacc_ablk_exit_tfm(struct crypto_skcipher *tfm)
1040 {
1041         struct spacc_ablk_ctx *ctx = crypto_skcipher_ctx(tfm);
1042
1043         crypto_free_sync_skcipher(ctx->sw_cipher);
1044 }
1045
1046 static int spacc_ablk_encrypt(struct skcipher_request *req)
1047 {
1048         struct crypto_skcipher *cipher = crypto_skcipher_reqtfm(req);
1049         struct skcipher_alg *alg = crypto_skcipher_alg(cipher);
1050         struct spacc_alg *spacc_alg = to_spacc_skcipher(alg);
1051
1052         return spacc_ablk_setup(req, spacc_alg->type, 1);
1053 }
1054
1055 static int spacc_ablk_decrypt(struct skcipher_request *req)
1056 {
1057         struct crypto_skcipher *cipher = crypto_skcipher_reqtfm(req);
1058         struct skcipher_alg *alg = crypto_skcipher_alg(cipher);
1059         struct spacc_alg *spacc_alg = to_spacc_skcipher(alg);
1060
1061         return spacc_ablk_setup(req, spacc_alg->type, 0);
1062 }
1063
1064 static inline int spacc_fifo_stat_empty(struct spacc_engine *engine)
1065 {
1066         return readl(engine->regs + SPA_FIFO_STAT_REG_OFFSET) &
1067                 SPA_FIFO_STAT_EMPTY;
1068 }
1069
1070 static void spacc_process_done(struct spacc_engine *engine)
1071 {
1072         struct spacc_req *req;
1073         unsigned long flags;
1074
1075         spin_lock_irqsave(&engine->hw_lock, flags);
1076
1077         while (!spacc_fifo_stat_empty(engine)) {
1078                 req = list_first_entry(&engine->in_progress, struct spacc_req,
1079                                        list);
1080                 list_move_tail(&req->list, &engine->completed);
1081                 --engine->in_flight;
1082
1083                 /* POP the status register. */
1084                 writel(~0, engine->regs + SPA_STAT_POP_REG_OFFSET);
1085                 req->result = (readl(engine->regs + SPA_STATUS_REG_OFFSET) &
1086                      SPA_STATUS_RES_CODE_MASK) >> SPA_STATUS_RES_CODE_OFFSET;
1087
1088                 /*
1089                  * Convert the SPAcc error status into the standard POSIX error
1090                  * codes.
1091                  */
1092                 if (unlikely(req->result)) {
1093                         switch (req->result) {
1094                         case SPA_STATUS_ICV_FAIL:
1095                                 req->result = -EBADMSG;
1096                                 break;
1097
1098                         case SPA_STATUS_MEMORY_ERROR:
1099                                 dev_warn(engine->dev,
1100                                          "memory error triggered\n");
1101                                 req->result = -EFAULT;
1102                                 break;
1103
1104                         case SPA_STATUS_BLOCK_ERROR:
1105                                 dev_warn(engine->dev,
1106                                          "block error triggered\n");
1107                                 req->result = -EIO;
1108                                 break;
1109                         }
1110                 }
1111         }
1112
1113         tasklet_schedule(&engine->complete);
1114
1115         spin_unlock_irqrestore(&engine->hw_lock, flags);
1116 }
1117
1118 static irqreturn_t spacc_spacc_irq(int irq, void *dev)
1119 {
1120         struct spacc_engine *engine = (struct spacc_engine *)dev;
1121         u32 spacc_irq_stat = readl(engine->regs + SPA_IRQ_STAT_REG_OFFSET);
1122
1123         writel(spacc_irq_stat, engine->regs + SPA_IRQ_STAT_REG_OFFSET);
1124         spacc_process_done(engine);
1125
1126         return IRQ_HANDLED;
1127 }
1128
1129 static void spacc_packet_timeout(struct timer_list *t)
1130 {
1131         struct spacc_engine *engine = from_timer(engine, t, packet_timeout);
1132
1133         spacc_process_done(engine);
1134 }
1135
1136 static int spacc_req_submit(struct spacc_req *req)
1137 {
1138         struct crypto_alg *alg = req->req->tfm->__crt_alg;
1139
1140         if (CRYPTO_ALG_TYPE_AEAD == (CRYPTO_ALG_TYPE_MASK & alg->cra_flags))
1141                 return spacc_aead_submit(req);
1142         else
1143                 return spacc_ablk_submit(req);
1144 }
1145
1146 static void spacc_spacc_complete(unsigned long data)
1147 {
1148         struct spacc_engine *engine = (struct spacc_engine *)data;
1149         struct spacc_req *req, *tmp;
1150         unsigned long flags;
1151         LIST_HEAD(completed);
1152
1153         spin_lock_irqsave(&engine->hw_lock, flags);
1154
1155         list_splice_init(&engine->completed, &completed);
1156         spacc_push(engine);
1157         if (engine->in_flight)
1158                 mod_timer(&engine->packet_timeout, jiffies + PACKET_TIMEOUT);
1159
1160         spin_unlock_irqrestore(&engine->hw_lock, flags);
1161
1162         list_for_each_entry_safe(req, tmp, &completed, list) {
1163                 list_del(&req->list);
1164                 req->complete(req);
1165         }
1166 }
1167
1168 #ifdef CONFIG_PM
1169 static int spacc_suspend(struct device *dev)
1170 {
1171         struct spacc_engine *engine = dev_get_drvdata(dev);
1172
1173         /*
1174          * We only support standby mode. All we have to do is gate the clock to
1175          * the spacc. The hardware will preserve state until we turn it back
1176          * on again.
1177          */
1178         clk_disable(engine->clk);
1179
1180         return 0;
1181 }
1182
1183 static int spacc_resume(struct device *dev)
1184 {
1185         struct spacc_engine *engine = dev_get_drvdata(dev);
1186
1187         return clk_enable(engine->clk);
1188 }
1189
1190 static const struct dev_pm_ops spacc_pm_ops = {
1191         .suspend        = spacc_suspend,
1192         .resume         = spacc_resume,
1193 };
1194 #endif /* CONFIG_PM */
1195
1196 static inline struct spacc_engine *spacc_dev_to_engine(struct device *dev)
1197 {
1198         return dev ? dev_get_drvdata(dev) : NULL;
1199 }
1200
1201 static ssize_t spacc_stat_irq_thresh_show(struct device *dev,
1202                                           struct device_attribute *attr,
1203                                           char *buf)
1204 {
1205         struct spacc_engine *engine = spacc_dev_to_engine(dev);
1206
1207         return snprintf(buf, PAGE_SIZE, "%u\n", engine->stat_irq_thresh);
1208 }
1209
1210 static ssize_t spacc_stat_irq_thresh_store(struct device *dev,
1211                                            struct device_attribute *attr,
1212                                            const char *buf, size_t len)
1213 {
1214         struct spacc_engine *engine = spacc_dev_to_engine(dev);
1215         unsigned long thresh;
1216
1217         if (kstrtoul(buf, 0, &thresh))
1218                 return -EINVAL;
1219
1220         thresh = clamp(thresh, 1UL, engine->fifo_sz - 1);
1221
1222         engine->stat_irq_thresh = thresh;
1223         writel(engine->stat_irq_thresh << SPA_IRQ_CTRL_STAT_CNT_OFFSET,
1224                engine->regs + SPA_IRQ_CTRL_REG_OFFSET);
1225
1226         return len;
1227 }
1228 static DEVICE_ATTR(stat_irq_thresh, 0644, spacc_stat_irq_thresh_show,
1229                    spacc_stat_irq_thresh_store);
1230
1231 static struct spacc_alg ipsec_engine_algs[] = {
1232         {
1233                 .ctrl_default = SPA_CTRL_CIPH_ALG_AES | SPA_CTRL_CIPH_MODE_CBC,
1234                 .key_offs = 0,
1235                 .iv_offs = AES_MAX_KEY_SIZE,
1236                 .alg = {
1237                         .base.cra_name          = "cbc(aes)",
1238                         .base.cra_driver_name   = "cbc-aes-picoxcell",
1239                         .base.cra_priority      = SPACC_CRYPTO_ALG_PRIORITY,
1240                         .base.cra_flags         = CRYPTO_ALG_KERN_DRIVER_ONLY |
1241                                                   CRYPTO_ALG_ASYNC |
1242                                                   CRYPTO_ALG_NEED_FALLBACK,
1243                         .base.cra_blocksize     = AES_BLOCK_SIZE,
1244                         .base.cra_ctxsize       = sizeof(struct spacc_ablk_ctx),
1245                         .base.cra_module        = THIS_MODULE,
1246
1247                         .setkey                 = spacc_aes_setkey,
1248                         .encrypt                = spacc_ablk_encrypt,
1249                         .decrypt                = spacc_ablk_decrypt,
1250                         .min_keysize            = AES_MIN_KEY_SIZE,
1251                         .max_keysize            = AES_MAX_KEY_SIZE,
1252                         .ivsize                 = AES_BLOCK_SIZE,
1253                         .init                   = spacc_ablk_init_tfm,
1254                         .exit                   = spacc_ablk_exit_tfm,
1255                 },
1256         },
1257         {
1258                 .key_offs = 0,
1259                 .iv_offs = AES_MAX_KEY_SIZE,
1260                 .ctrl_default = SPA_CTRL_CIPH_ALG_AES | SPA_CTRL_CIPH_MODE_ECB,
1261                 .alg = {
1262                         .base.cra_name          = "ecb(aes)",
1263                         .base.cra_driver_name   = "ecb-aes-picoxcell",
1264                         .base.cra_priority      = SPACC_CRYPTO_ALG_PRIORITY,
1265                         .base.cra_flags         = CRYPTO_ALG_KERN_DRIVER_ONLY |
1266                                                   CRYPTO_ALG_ASYNC |
1267                                                   CRYPTO_ALG_NEED_FALLBACK,
1268                         .base.cra_blocksize     = AES_BLOCK_SIZE,
1269                         .base.cra_ctxsize       = sizeof(struct spacc_ablk_ctx),
1270                         .base.cra_module        = THIS_MODULE,
1271
1272                         .setkey                 = spacc_aes_setkey,
1273                         .encrypt                = spacc_ablk_encrypt,
1274                         .decrypt                = spacc_ablk_decrypt,
1275                         .min_keysize            = AES_MIN_KEY_SIZE,
1276                         .max_keysize            = AES_MAX_KEY_SIZE,
1277                         .init                   = spacc_ablk_init_tfm,
1278                         .exit                   = spacc_ablk_exit_tfm,
1279                 },
1280         },
1281         {
1282                 .key_offs = DES_BLOCK_SIZE,
1283                 .iv_offs = 0,
1284                 .ctrl_default = SPA_CTRL_CIPH_ALG_DES | SPA_CTRL_CIPH_MODE_CBC,
1285                 .alg = {
1286                         .base.cra_name          = "cbc(des)",
1287                         .base.cra_driver_name   = "cbc-des-picoxcell",
1288                         .base.cra_priority      = SPACC_CRYPTO_ALG_PRIORITY,
1289                         .base.cra_flags         = CRYPTO_ALG_KERN_DRIVER_ONLY |
1290                                                   CRYPTO_ALG_ASYNC,
1291                         .base.cra_blocksize     = DES_BLOCK_SIZE,
1292                         .base.cra_ctxsize       = sizeof(struct spacc_ablk_ctx),
1293                         .base.cra_module        = THIS_MODULE,
1294
1295                         .setkey                 = spacc_des_setkey,
1296                         .encrypt                = spacc_ablk_encrypt,
1297                         .decrypt                = spacc_ablk_decrypt,
1298                         .min_keysize            = DES_KEY_SIZE,
1299                         .max_keysize            = DES_KEY_SIZE,
1300                         .ivsize                 = DES_BLOCK_SIZE,
1301                         .init                   = spacc_ablk_init_tfm,
1302                         .exit                   = spacc_ablk_exit_tfm,
1303                 },
1304         },
1305         {
1306                 .key_offs = DES_BLOCK_SIZE,
1307                 .iv_offs = 0,
1308                 .ctrl_default = SPA_CTRL_CIPH_ALG_DES | SPA_CTRL_CIPH_MODE_ECB,
1309                 .alg = {
1310                         .base.cra_name          = "ecb(des)",
1311                         .base.cra_driver_name   = "ecb-des-picoxcell",
1312                         .base.cra_priority      = SPACC_CRYPTO_ALG_PRIORITY,
1313                         .base.cra_flags         = CRYPTO_ALG_KERN_DRIVER_ONLY |
1314                                                   CRYPTO_ALG_ASYNC,
1315                         .base.cra_blocksize     = DES_BLOCK_SIZE,
1316                         .base.cra_ctxsize       = sizeof(struct spacc_ablk_ctx),
1317                         .base.cra_module        = THIS_MODULE,
1318
1319                         .setkey                 = spacc_des_setkey,
1320                         .encrypt                = spacc_ablk_encrypt,
1321                         .decrypt                = spacc_ablk_decrypt,
1322                         .min_keysize            = DES_KEY_SIZE,
1323                         .max_keysize            = DES_KEY_SIZE,
1324                         .init                   = spacc_ablk_init_tfm,
1325                         .exit                   = spacc_ablk_exit_tfm,
1326                 },
1327         },
1328         {
1329                 .key_offs = DES_BLOCK_SIZE,
1330                 .iv_offs = 0,
1331                 .ctrl_default = SPA_CTRL_CIPH_ALG_DES | SPA_CTRL_CIPH_MODE_CBC,
1332                 .alg = {
1333                         .base.cra_name          = "cbc(des3_ede)",
1334                         .base.cra_driver_name   = "cbc-des3-ede-picoxcell",
1335                         .base.cra_priority      = SPACC_CRYPTO_ALG_PRIORITY,
1336                         .base.cra_flags         = CRYPTO_ALG_ASYNC |
1337                                                   CRYPTO_ALG_KERN_DRIVER_ONLY,
1338                         .base.cra_blocksize     = DES3_EDE_BLOCK_SIZE,
1339                         .base.cra_ctxsize       = sizeof(struct spacc_ablk_ctx),
1340                         .base.cra_module        = THIS_MODULE,
1341
1342                         .setkey                 = spacc_des3_setkey,
1343                         .encrypt                = spacc_ablk_encrypt,
1344                         .decrypt                = spacc_ablk_decrypt,
1345                         .min_keysize            = DES3_EDE_KEY_SIZE,
1346                         .max_keysize            = DES3_EDE_KEY_SIZE,
1347                         .ivsize                 = DES3_EDE_BLOCK_SIZE,
1348                         .init                   = spacc_ablk_init_tfm,
1349                         .exit                   = spacc_ablk_exit_tfm,
1350                 },
1351         },
1352         {
1353                 .key_offs = DES_BLOCK_SIZE,
1354                 .iv_offs = 0,
1355                 .ctrl_default = SPA_CTRL_CIPH_ALG_DES | SPA_CTRL_CIPH_MODE_ECB,
1356                 .alg = {
1357                         .base.cra_name          = "ecb(des3_ede)",
1358                         .base.cra_driver_name   = "ecb-des3-ede-picoxcell",
1359                         .base.cra_priority      = SPACC_CRYPTO_ALG_PRIORITY,
1360                         .base.cra_flags         = CRYPTO_ALG_ASYNC |
1361                                                   CRYPTO_ALG_KERN_DRIVER_ONLY,
1362                         .base.cra_blocksize     = DES3_EDE_BLOCK_SIZE,
1363                         .base.cra_ctxsize       = sizeof(struct spacc_ablk_ctx),
1364                         .base.cra_module        = THIS_MODULE,
1365
1366                         .setkey                 = spacc_des3_setkey,
1367                         .encrypt                = spacc_ablk_encrypt,
1368                         .decrypt                = spacc_ablk_decrypt,
1369                         .min_keysize            = DES3_EDE_KEY_SIZE,
1370                         .max_keysize            = DES3_EDE_KEY_SIZE,
1371                         .init                   = spacc_ablk_init_tfm,
1372                         .exit                   = spacc_ablk_exit_tfm,
1373                 },
1374         },
1375 };
1376
1377 static struct spacc_aead ipsec_engine_aeads[] = {
1378         {
1379                 .ctrl_default = SPA_CTRL_CIPH_ALG_AES |
1380                                 SPA_CTRL_CIPH_MODE_CBC |
1381                                 SPA_CTRL_HASH_ALG_SHA |
1382                                 SPA_CTRL_HASH_MODE_HMAC,
1383                 .key_offs = 0,
1384                 .iv_offs = AES_MAX_KEY_SIZE,
1385                 .alg = {
1386                         .base = {
1387                                 .cra_name = "authenc(hmac(sha1),cbc(aes))",
1388                                 .cra_driver_name = "authenc-hmac-sha1-"
1389                                                    "cbc-aes-picoxcell",
1390                                 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1391                                 .cra_flags = CRYPTO_ALG_ASYNC |
1392                                              CRYPTO_ALG_NEED_FALLBACK |
1393                                              CRYPTO_ALG_KERN_DRIVER_ONLY,
1394                                 .cra_blocksize = AES_BLOCK_SIZE,
1395                                 .cra_ctxsize = sizeof(struct spacc_aead_ctx),
1396                                 .cra_module = THIS_MODULE,
1397                         },
1398                         .setkey = spacc_aead_setkey,
1399                         .setauthsize = spacc_aead_setauthsize,
1400                         .encrypt = spacc_aead_encrypt,
1401                         .decrypt = spacc_aead_decrypt,
1402                         .ivsize = AES_BLOCK_SIZE,
1403                         .maxauthsize = SHA1_DIGEST_SIZE,
1404                         .init = spacc_aead_cra_init,
1405                         .exit = spacc_aead_cra_exit,
1406                 },
1407         },
1408         {
1409                 .ctrl_default = SPA_CTRL_CIPH_ALG_AES |
1410                                 SPA_CTRL_CIPH_MODE_CBC |
1411                                 SPA_CTRL_HASH_ALG_SHA256 |
1412                                 SPA_CTRL_HASH_MODE_HMAC,
1413                 .key_offs = 0,
1414                 .iv_offs = AES_MAX_KEY_SIZE,
1415                 .alg = {
1416                         .base = {
1417                                 .cra_name = "authenc(hmac(sha256),cbc(aes))",
1418                                 .cra_driver_name = "authenc-hmac-sha256-"
1419                                                    "cbc-aes-picoxcell",
1420                                 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1421                                 .cra_flags = CRYPTO_ALG_ASYNC |
1422                                              CRYPTO_ALG_NEED_FALLBACK |
1423                                              CRYPTO_ALG_KERN_DRIVER_ONLY,
1424                                 .cra_blocksize = AES_BLOCK_SIZE,
1425                                 .cra_ctxsize = sizeof(struct spacc_aead_ctx),
1426                                 .cra_module = THIS_MODULE,
1427                         },
1428                         .setkey = spacc_aead_setkey,
1429                         .setauthsize = spacc_aead_setauthsize,
1430                         .encrypt = spacc_aead_encrypt,
1431                         .decrypt = spacc_aead_decrypt,
1432                         .ivsize = AES_BLOCK_SIZE,
1433                         .maxauthsize = SHA256_DIGEST_SIZE,
1434                         .init = spacc_aead_cra_init,
1435                         .exit = spacc_aead_cra_exit,
1436                 },
1437         },
1438         {
1439                 .key_offs = 0,
1440                 .iv_offs = AES_MAX_KEY_SIZE,
1441                 .ctrl_default = SPA_CTRL_CIPH_ALG_AES |
1442                                 SPA_CTRL_CIPH_MODE_CBC |
1443                                 SPA_CTRL_HASH_ALG_MD5 |
1444                                 SPA_CTRL_HASH_MODE_HMAC,
1445                 .alg = {
1446                         .base = {
1447                                 .cra_name = "authenc(hmac(md5),cbc(aes))",
1448                                 .cra_driver_name = "authenc-hmac-md5-"
1449                                                    "cbc-aes-picoxcell",
1450                                 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1451                                 .cra_flags = CRYPTO_ALG_ASYNC |
1452                                              CRYPTO_ALG_NEED_FALLBACK |
1453                                              CRYPTO_ALG_KERN_DRIVER_ONLY,
1454                                 .cra_blocksize = AES_BLOCK_SIZE,
1455                                 .cra_ctxsize = sizeof(struct spacc_aead_ctx),
1456                                 .cra_module = THIS_MODULE,
1457                         },
1458                         .setkey = spacc_aead_setkey,
1459                         .setauthsize = spacc_aead_setauthsize,
1460                         .encrypt = spacc_aead_encrypt,
1461                         .decrypt = spacc_aead_decrypt,
1462                         .ivsize = AES_BLOCK_SIZE,
1463                         .maxauthsize = MD5_DIGEST_SIZE,
1464                         .init = spacc_aead_cra_init,
1465                         .exit = spacc_aead_cra_exit,
1466                 },
1467         },
1468         {
1469                 .key_offs = DES_BLOCK_SIZE,
1470                 .iv_offs = 0,
1471                 .ctrl_default = SPA_CTRL_CIPH_ALG_DES |
1472                                 SPA_CTRL_CIPH_MODE_CBC |
1473                                 SPA_CTRL_HASH_ALG_SHA |
1474                                 SPA_CTRL_HASH_MODE_HMAC,
1475                 .alg = {
1476                         .base = {
1477                                 .cra_name = "authenc(hmac(sha1),cbc(des3_ede))",
1478                                 .cra_driver_name = "authenc-hmac-sha1-"
1479                                                    "cbc-3des-picoxcell",
1480                                 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1481                                 .cra_flags = CRYPTO_ALG_ASYNC |
1482                                              CRYPTO_ALG_NEED_FALLBACK |
1483                                              CRYPTO_ALG_KERN_DRIVER_ONLY,
1484                                 .cra_blocksize = DES3_EDE_BLOCK_SIZE,
1485                                 .cra_ctxsize = sizeof(struct spacc_aead_ctx),
1486                                 .cra_module = THIS_MODULE,
1487                         },
1488                         .setkey = spacc_aead_setkey,
1489                         .setauthsize = spacc_aead_setauthsize,
1490                         .encrypt = spacc_aead_encrypt,
1491                         .decrypt = spacc_aead_decrypt,
1492                         .ivsize = DES3_EDE_BLOCK_SIZE,
1493                         .maxauthsize = SHA1_DIGEST_SIZE,
1494                         .init = spacc_aead_cra_init,
1495                         .exit = spacc_aead_cra_exit,
1496                 },
1497         },
1498         {
1499                 .key_offs = DES_BLOCK_SIZE,
1500                 .iv_offs = 0,
1501                 .ctrl_default = SPA_CTRL_CIPH_ALG_AES |
1502                                 SPA_CTRL_CIPH_MODE_CBC |
1503                                 SPA_CTRL_HASH_ALG_SHA256 |
1504                                 SPA_CTRL_HASH_MODE_HMAC,
1505                 .alg = {
1506                         .base = {
1507                                 .cra_name = "authenc(hmac(sha256),"
1508                                             "cbc(des3_ede))",
1509                                 .cra_driver_name = "authenc-hmac-sha256-"
1510                                                    "cbc-3des-picoxcell",
1511                                 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1512                                 .cra_flags = CRYPTO_ALG_ASYNC |
1513                                              CRYPTO_ALG_NEED_FALLBACK |
1514                                              CRYPTO_ALG_KERN_DRIVER_ONLY,
1515                                 .cra_blocksize = DES3_EDE_BLOCK_SIZE,
1516                                 .cra_ctxsize = sizeof(struct spacc_aead_ctx),
1517                                 .cra_module = THIS_MODULE,
1518                         },
1519                         .setkey = spacc_aead_setkey,
1520                         .setauthsize = spacc_aead_setauthsize,
1521                         .encrypt = spacc_aead_encrypt,
1522                         .decrypt = spacc_aead_decrypt,
1523                         .ivsize = DES3_EDE_BLOCK_SIZE,
1524                         .maxauthsize = SHA256_DIGEST_SIZE,
1525                         .init = spacc_aead_cra_init,
1526                         .exit = spacc_aead_cra_exit,
1527                 },
1528         },
1529         {
1530                 .key_offs = DES_BLOCK_SIZE,
1531                 .iv_offs = 0,
1532                 .ctrl_default = SPA_CTRL_CIPH_ALG_DES |
1533                                 SPA_CTRL_CIPH_MODE_CBC |
1534                                 SPA_CTRL_HASH_ALG_MD5 |
1535                                 SPA_CTRL_HASH_MODE_HMAC,
1536                 .alg = {
1537                         .base = {
1538                                 .cra_name = "authenc(hmac(md5),cbc(des3_ede))",
1539                                 .cra_driver_name = "authenc-hmac-md5-"
1540                                                    "cbc-3des-picoxcell",
1541                                 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1542                                 .cra_flags = CRYPTO_ALG_ASYNC |
1543                                              CRYPTO_ALG_NEED_FALLBACK |
1544                                              CRYPTO_ALG_KERN_DRIVER_ONLY,
1545                                 .cra_blocksize = DES3_EDE_BLOCK_SIZE,
1546                                 .cra_ctxsize = sizeof(struct spacc_aead_ctx),
1547                                 .cra_module = THIS_MODULE,
1548                         },
1549                         .setkey = spacc_aead_setkey,
1550                         .setauthsize = spacc_aead_setauthsize,
1551                         .encrypt = spacc_aead_encrypt,
1552                         .decrypt = spacc_aead_decrypt,
1553                         .ivsize = DES3_EDE_BLOCK_SIZE,
1554                         .maxauthsize = MD5_DIGEST_SIZE,
1555                         .init = spacc_aead_cra_init,
1556                         .exit = spacc_aead_cra_exit,
1557                 },
1558         },
1559 };
1560
1561 static struct spacc_alg l2_engine_algs[] = {
1562         {
1563                 .key_offs = 0,
1564                 .iv_offs = SPACC_CRYPTO_KASUMI_F8_KEY_LEN,
1565                 .ctrl_default = SPA_CTRL_CIPH_ALG_KASUMI |
1566                                 SPA_CTRL_CIPH_MODE_F8,
1567                 .alg = {
1568                         .base.cra_name          = "f8(kasumi)",
1569                         .base.cra_driver_name   = "f8-kasumi-picoxcell",
1570                         .base.cra_priority      = SPACC_CRYPTO_ALG_PRIORITY,
1571                         .base.cra_flags         = CRYPTO_ALG_ASYNC |
1572                                                   CRYPTO_ALG_KERN_DRIVER_ONLY,
1573                         .base.cra_blocksize     = 8,
1574                         .base.cra_ctxsize       = sizeof(struct spacc_ablk_ctx),
1575                         .base.cra_module        = THIS_MODULE,
1576
1577                         .setkey                 = spacc_kasumi_f8_setkey,
1578                         .encrypt                = spacc_ablk_encrypt,
1579                         .decrypt                = spacc_ablk_decrypt,
1580                         .min_keysize            = 16,
1581                         .max_keysize            = 16,
1582                         .ivsize                 = 8,
1583                         .init                   = spacc_ablk_init_tfm,
1584                         .exit                   = spacc_ablk_exit_tfm,
1585                 },
1586         },
1587 };
1588
1589 #ifdef CONFIG_OF
1590 static const struct of_device_id spacc_of_id_table[] = {
1591         { .compatible = "picochip,spacc-ipsec" },
1592         { .compatible = "picochip,spacc-l2" },
1593         {}
1594 };
1595 MODULE_DEVICE_TABLE(of, spacc_of_id_table);
1596 #endif /* CONFIG_OF */
1597
1598 static int spacc_probe(struct platform_device *pdev)
1599 {
1600         int i, err, ret;
1601         struct resource *irq;
1602         struct device_node *np = pdev->dev.of_node;
1603         struct spacc_engine *engine = devm_kzalloc(&pdev->dev, sizeof(*engine),
1604                                                    GFP_KERNEL);
1605         if (!engine)
1606                 return -ENOMEM;
1607
1608         if (of_device_is_compatible(np, "picochip,spacc-ipsec")) {
1609                 engine->max_ctxs        = SPACC_CRYPTO_IPSEC_MAX_CTXS;
1610                 engine->cipher_pg_sz    = SPACC_CRYPTO_IPSEC_CIPHER_PG_SZ;
1611                 engine->hash_pg_sz      = SPACC_CRYPTO_IPSEC_HASH_PG_SZ;
1612                 engine->fifo_sz         = SPACC_CRYPTO_IPSEC_FIFO_SZ;
1613                 engine->algs            = ipsec_engine_algs;
1614                 engine->num_algs        = ARRAY_SIZE(ipsec_engine_algs);
1615                 engine->aeads           = ipsec_engine_aeads;
1616                 engine->num_aeads       = ARRAY_SIZE(ipsec_engine_aeads);
1617         } else if (of_device_is_compatible(np, "picochip,spacc-l2")) {
1618                 engine->max_ctxs        = SPACC_CRYPTO_L2_MAX_CTXS;
1619                 engine->cipher_pg_sz    = SPACC_CRYPTO_L2_CIPHER_PG_SZ;
1620                 engine->hash_pg_sz      = SPACC_CRYPTO_L2_HASH_PG_SZ;
1621                 engine->fifo_sz         = SPACC_CRYPTO_L2_FIFO_SZ;
1622                 engine->algs            = l2_engine_algs;
1623                 engine->num_algs        = ARRAY_SIZE(l2_engine_algs);
1624         } else {
1625                 return -EINVAL;
1626         }
1627
1628         engine->name = dev_name(&pdev->dev);
1629
1630         engine->regs = devm_platform_ioremap_resource(pdev, 0);
1631         if (IS_ERR(engine->regs))
1632                 return PTR_ERR(engine->regs);
1633
1634         irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1635         if (!irq) {
1636                 dev_err(&pdev->dev, "no memory/irq resource for engine\n");
1637                 return -ENXIO;
1638         }
1639
1640         if (devm_request_irq(&pdev->dev, irq->start, spacc_spacc_irq, 0,
1641                              engine->name, engine)) {
1642                 dev_err(engine->dev, "failed to request IRQ\n");
1643                 return -EBUSY;
1644         }
1645
1646         engine->dev             = &pdev->dev;
1647         engine->cipher_ctx_base = engine->regs + SPA_CIPH_KEY_BASE_REG_OFFSET;
1648         engine->hash_key_base   = engine->regs + SPA_HASH_KEY_BASE_REG_OFFSET;
1649
1650         engine->req_pool = dmam_pool_create(engine->name, engine->dev,
1651                 MAX_DDT_LEN * sizeof(struct spacc_ddt), 8, SZ_64K);
1652         if (!engine->req_pool)
1653                 return -ENOMEM;
1654
1655         spin_lock_init(&engine->hw_lock);
1656
1657         engine->clk = clk_get(&pdev->dev, "ref");
1658         if (IS_ERR(engine->clk)) {
1659                 dev_info(&pdev->dev, "clk unavailable\n");
1660                 return PTR_ERR(engine->clk);
1661         }
1662
1663         if (clk_prepare_enable(engine->clk)) {
1664                 dev_info(&pdev->dev, "unable to prepare/enable clk\n");
1665                 ret = -EIO;
1666                 goto err_clk_put;
1667         }
1668
1669         ret = device_create_file(&pdev->dev, &dev_attr_stat_irq_thresh);
1670         if (ret)
1671                 goto err_clk_disable;
1672
1673
1674         /*
1675          * Use an IRQ threshold of 50% as a default. This seems to be a
1676          * reasonable trade off of latency against throughput but can be
1677          * changed at runtime.
1678          */
1679         engine->stat_irq_thresh = (engine->fifo_sz / 2);
1680
1681         /*
1682          * Configure the interrupts. We only use the STAT_CNT interrupt as we
1683          * only submit a new packet for processing when we complete another in
1684          * the queue. This minimizes time spent in the interrupt handler.
1685          */
1686         writel(engine->stat_irq_thresh << SPA_IRQ_CTRL_STAT_CNT_OFFSET,
1687                engine->regs + SPA_IRQ_CTRL_REG_OFFSET);
1688         writel(SPA_IRQ_EN_STAT_EN | SPA_IRQ_EN_GLBL_EN,
1689                engine->regs + SPA_IRQ_EN_REG_OFFSET);
1690
1691         timer_setup(&engine->packet_timeout, spacc_packet_timeout, 0);
1692
1693         INIT_LIST_HEAD(&engine->pending);
1694         INIT_LIST_HEAD(&engine->completed);
1695         INIT_LIST_HEAD(&engine->in_progress);
1696         engine->in_flight = 0;
1697         tasklet_init(&engine->complete, spacc_spacc_complete,
1698                      (unsigned long)engine);
1699
1700         platform_set_drvdata(pdev, engine);
1701
1702         ret = -EINVAL;
1703         INIT_LIST_HEAD(&engine->registered_algs);
1704         for (i = 0; i < engine->num_algs; ++i) {
1705                 engine->algs[i].engine = engine;
1706                 err = crypto_register_skcipher(&engine->algs[i].alg);
1707                 if (!err) {
1708                         list_add_tail(&engine->algs[i].entry,
1709                                       &engine->registered_algs);
1710                         ret = 0;
1711                 }
1712                 if (err)
1713                         dev_err(engine->dev, "failed to register alg \"%s\"\n",
1714                                 engine->algs[i].alg.base.cra_name);
1715                 else
1716                         dev_dbg(engine->dev, "registered alg \"%s\"\n",
1717                                 engine->algs[i].alg.base.cra_name);
1718         }
1719
1720         INIT_LIST_HEAD(&engine->registered_aeads);
1721         for (i = 0; i < engine->num_aeads; ++i) {
1722                 engine->aeads[i].engine = engine;
1723                 err = crypto_register_aead(&engine->aeads[i].alg);
1724                 if (!err) {
1725                         list_add_tail(&engine->aeads[i].entry,
1726                                       &engine->registered_aeads);
1727                         ret = 0;
1728                 }
1729                 if (err)
1730                         dev_err(engine->dev, "failed to register alg \"%s\"\n",
1731                                 engine->aeads[i].alg.base.cra_name);
1732                 else
1733                         dev_dbg(engine->dev, "registered alg \"%s\"\n",
1734                                 engine->aeads[i].alg.base.cra_name);
1735         }
1736
1737         if (!ret)
1738                 return 0;
1739
1740         del_timer_sync(&engine->packet_timeout);
1741         device_remove_file(&pdev->dev, &dev_attr_stat_irq_thresh);
1742 err_clk_disable:
1743         clk_disable_unprepare(engine->clk);
1744 err_clk_put:
1745         clk_put(engine->clk);
1746
1747         return ret;
1748 }
1749
1750 static int spacc_remove(struct platform_device *pdev)
1751 {
1752         struct spacc_aead *aead, *an;
1753         struct spacc_alg *alg, *next;
1754         struct spacc_engine *engine = platform_get_drvdata(pdev);
1755
1756         del_timer_sync(&engine->packet_timeout);
1757         device_remove_file(&pdev->dev, &dev_attr_stat_irq_thresh);
1758
1759         list_for_each_entry_safe(aead, an, &engine->registered_aeads, entry) {
1760                 list_del(&aead->entry);
1761                 crypto_unregister_aead(&aead->alg);
1762         }
1763
1764         list_for_each_entry_safe(alg, next, &engine->registered_algs, entry) {
1765                 list_del(&alg->entry);
1766                 crypto_unregister_skcipher(&alg->alg);
1767         }
1768
1769         clk_disable_unprepare(engine->clk);
1770         clk_put(engine->clk);
1771
1772         return 0;
1773 }
1774
1775 static struct platform_driver spacc_driver = {
1776         .probe          = spacc_probe,
1777         .remove         = spacc_remove,
1778         .driver         = {
1779                 .name   = "picochip,spacc",
1780 #ifdef CONFIG_PM
1781                 .pm     = &spacc_pm_ops,
1782 #endif /* CONFIG_PM */
1783                 .of_match_table = of_match_ptr(spacc_of_id_table),
1784         },
1785 };
1786
1787 module_platform_driver(spacc_driver);
1788
1789 MODULE_LICENSE("GPL");
1790 MODULE_AUTHOR("Jamie Iles");