Version:  2.0.40 2.2.26 2.4.37 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8

Linux/drivers/crypto/picoxcell_crypto.c

  1 /*
  2  * Copyright (c) 2010-2011 Picochip Ltd., Jamie Iles
  3  *
  4  * This program is free software; you can redistribute it and/or modify
  5  * it under the terms of the GNU General Public License as published by
  6  * the Free Software Foundation; either version 2 of the License, or
  7  * (at your option) any later version.
  8  *
  9  * This program is distributed in the hope that it will be useful,
 10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 12  * GNU General Public License for more details.
 13  *
 14  * You should have received a copy of the GNU General Public License
 15  * along with this program; if not, write to the Free Software
 16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 17  */
 18 #include <crypto/internal/aead.h>
 19 #include <crypto/aes.h>
 20 #include <crypto/algapi.h>
 21 #include <crypto/authenc.h>
 22 #include <crypto/des.h>
 23 #include <crypto/md5.h>
 24 #include <crypto/sha.h>
 25 #include <crypto/internal/skcipher.h>
 26 #include <linux/clk.h>
 27 #include <linux/crypto.h>
 28 #include <linux/delay.h>
 29 #include <linux/dma-mapping.h>
 30 #include <linux/dmapool.h>
 31 #include <linux/err.h>
 32 #include <linux/init.h>
 33 #include <linux/interrupt.h>
 34 #include <linux/io.h>
 35 #include <linux/list.h>
 36 #include <linux/module.h>
 37 #include <linux/of.h>
 38 #include <linux/platform_device.h>
 39 #include <linux/pm.h>
 40 #include <linux/rtnetlink.h>
 41 #include <linux/scatterlist.h>
 42 #include <linux/sched.h>
 43 #include <linux/sizes.h>
 44 #include <linux/slab.h>
 45 #include <linux/timer.h>
 46 
 47 #include "picoxcell_crypto_regs.h"
 48 
 49 /*
 50  * The threshold for the number of entries in the CMD FIFO available before
 51  * the CMD0_CNT interrupt is raised. Increasing this value will reduce the
 52  * number of interrupts raised to the CPU.
 53  */
 54 #define CMD0_IRQ_THRESHOLD   1
 55 
 56 /*
 57  * The timeout period (in jiffies) for a PDU. When the the number of PDUs in
 58  * flight is greater than the STAT_IRQ_THRESHOLD or 0 the timer is disabled.
 59  * When there are packets in flight but lower than the threshold, we enable
 60  * the timer and at expiry, attempt to remove any processed packets from the
 61  * queue and if there are still packets left, schedule the timer again.
 62  */
 63 #define PACKET_TIMEOUT      1
 64 
 65 /* The priority to register each algorithm with. */
 66 #define SPACC_CRYPTO_ALG_PRIORITY       10000
 67 
 68 #define SPACC_CRYPTO_KASUMI_F8_KEY_LEN  16
 69 #define SPACC_CRYPTO_IPSEC_CIPHER_PG_SZ 64
 70 #define SPACC_CRYPTO_IPSEC_HASH_PG_SZ   64
 71 #define SPACC_CRYPTO_IPSEC_MAX_CTXS     32
 72 #define SPACC_CRYPTO_IPSEC_FIFO_SZ      32
 73 #define SPACC_CRYPTO_L2_CIPHER_PG_SZ    64
 74 #define SPACC_CRYPTO_L2_HASH_PG_SZ      64
 75 #define SPACC_CRYPTO_L2_MAX_CTXS        128
 76 #define SPACC_CRYPTO_L2_FIFO_SZ         128
 77 
 78 #define MAX_DDT_LEN                     16
 79 
 80 /* DDT format. This must match the hardware DDT format exactly. */
 81 struct spacc_ddt {
 82         dma_addr_t      p;
 83         u32             len;
 84 };
 85 
 86 /*
 87  * Asynchronous crypto request structure.
 88  *
 89  * This structure defines a request that is either queued for processing or
 90  * being processed.
 91  */
 92 struct spacc_req {
 93         struct list_head                list;
 94         struct spacc_engine             *engine;
 95         struct crypto_async_request     *req;
 96         int                             result;
 97         bool                            is_encrypt;
 98         unsigned                        ctx_id;
 99         dma_addr_t                      src_addr, dst_addr;
100         struct spacc_ddt                *src_ddt, *dst_ddt;
101         void                            (*complete)(struct spacc_req *req);
102 };
103 
104 struct spacc_aead {
105         unsigned long                   ctrl_default;
106         unsigned long                   type;
107         struct aead_alg                 alg;
108         struct spacc_engine             *engine;
109         struct list_head                entry;
110         int                             key_offs;
111         int                             iv_offs;
112 };
113 
114 struct spacc_engine {
115         void __iomem                    *regs;
116         struct list_head                pending;
117         int                             next_ctx;
118         spinlock_t                      hw_lock;
119         int                             in_flight;
120         struct list_head                completed;
121         struct list_head                in_progress;
122         struct tasklet_struct           complete;
123         unsigned long                   fifo_sz;
124         void __iomem                    *cipher_ctx_base;
125         void __iomem                    *hash_key_base;
126         struct spacc_alg                *algs;
127         unsigned                        num_algs;
128         struct list_head                registered_algs;
129         struct spacc_aead               *aeads;
130         unsigned                        num_aeads;
131         struct list_head                registered_aeads;
132         size_t                          cipher_pg_sz;
133         size_t                          hash_pg_sz;
134         const char                      *name;
135         struct clk                      *clk;
136         struct device                   *dev;
137         unsigned                        max_ctxs;
138         struct timer_list               packet_timeout;
139         unsigned                        stat_irq_thresh;
140         struct dma_pool                 *req_pool;
141 };
142 
143 /* Algorithm type mask. */
144 #define SPACC_CRYPTO_ALG_MASK           0x7
145 
146 /* SPACC definition of a crypto algorithm. */
147 struct spacc_alg {
148         unsigned long                   ctrl_default;
149         unsigned long                   type;
150         struct crypto_alg               alg;
151         struct spacc_engine             *engine;
152         struct list_head                entry;
153         int                             key_offs;
154         int                             iv_offs;
155 };
156 
157 /* Generic context structure for any algorithm type. */
158 struct spacc_generic_ctx {
159         struct spacc_engine             *engine;
160         int                             flags;
161         int                             key_offs;
162         int                             iv_offs;
163 };
164 
165 /* Block cipher context. */
166 struct spacc_ablk_ctx {
167         struct spacc_generic_ctx        generic;
168         u8                              key[AES_MAX_KEY_SIZE];
169         u8                              key_len;
170         /*
171          * The fallback cipher. If the operation can't be done in hardware,
172          * fallback to a software version.
173          */
174         struct crypto_skcipher          *sw_cipher;
175 };
176 
177 /* AEAD cipher context. */
178 struct spacc_aead_ctx {
179         struct spacc_generic_ctx        generic;
180         u8                              cipher_key[AES_MAX_KEY_SIZE];
181         u8                              hash_ctx[SPACC_CRYPTO_IPSEC_HASH_PG_SZ];
182         u8                              cipher_key_len;
183         u8                              hash_key_len;
184         struct crypto_aead              *sw_cipher;
185 };
186 
187 static int spacc_ablk_submit(struct spacc_req *req);
188 
189 static inline struct spacc_alg *to_spacc_alg(struct crypto_alg *alg)
190 {
191         return alg ? container_of(alg, struct spacc_alg, alg) : NULL;
192 }
193 
194 static inline struct spacc_aead *to_spacc_aead(struct aead_alg *alg)
195 {
196         return container_of(alg, struct spacc_aead, alg);
197 }
198 
199 static inline int spacc_fifo_cmd_full(struct spacc_engine *engine)
200 {
201         u32 fifo_stat = readl(engine->regs + SPA_FIFO_STAT_REG_OFFSET);
202 
203         return fifo_stat & SPA_FIFO_CMD_FULL;
204 }
205 
206 /*
207  * Given a cipher context, and a context number, get the base address of the
208  * context page.
209  *
210  * Returns the address of the context page where the key/context may
211  * be written.
212  */
213 static inline void __iomem *spacc_ctx_page_addr(struct spacc_generic_ctx *ctx,
214                                                 unsigned indx,
215                                                 bool is_cipher_ctx)
216 {
217         return is_cipher_ctx ? ctx->engine->cipher_ctx_base +
218                         (indx * ctx->engine->cipher_pg_sz) :
219                 ctx->engine->hash_key_base + (indx * ctx->engine->hash_pg_sz);
220 }
221 
222 /* The context pages can only be written with 32-bit accesses. */
223 static inline void memcpy_toio32(u32 __iomem *dst, const void *src,
224                                  unsigned count)
225 {
226         const u32 *src32 = (const u32 *) src;
227 
228         while (count--)
229                 writel(*src32++, dst++);
230 }
231 
232 static void spacc_cipher_write_ctx(struct spacc_generic_ctx *ctx,
233                                    void __iomem *page_addr, const u8 *key,
234                                    size_t key_len, const u8 *iv, size_t iv_len)
235 {
236         void __iomem *key_ptr = page_addr + ctx->key_offs;
237         void __iomem *iv_ptr = page_addr + ctx->iv_offs;
238 
239         memcpy_toio32(key_ptr, key, key_len / 4);
240         memcpy_toio32(iv_ptr, iv, iv_len / 4);
241 }
242 
243 /*
244  * Load a context into the engines context memory.
245  *
246  * Returns the index of the context page where the context was loaded.
247  */
248 static unsigned spacc_load_ctx(struct spacc_generic_ctx *ctx,
249                                const u8 *ciph_key, size_t ciph_len,
250                                const u8 *iv, size_t ivlen, const u8 *hash_key,
251                                size_t hash_len)
252 {
253         unsigned indx = ctx->engine->next_ctx++;
254         void __iomem *ciph_page_addr, *hash_page_addr;
255 
256         ciph_page_addr = spacc_ctx_page_addr(ctx, indx, 1);
257         hash_page_addr = spacc_ctx_page_addr(ctx, indx, 0);
258 
259         ctx->engine->next_ctx &= ctx->engine->fifo_sz - 1;
260         spacc_cipher_write_ctx(ctx, ciph_page_addr, ciph_key, ciph_len, iv,
261                                ivlen);
262         writel(ciph_len | (indx << SPA_KEY_SZ_CTX_INDEX_OFFSET) |
263                (1 << SPA_KEY_SZ_CIPHER_OFFSET),
264                ctx->engine->regs + SPA_KEY_SZ_REG_OFFSET);
265 
266         if (hash_key) {
267                 memcpy_toio32(hash_page_addr, hash_key, hash_len / 4);
268                 writel(hash_len | (indx << SPA_KEY_SZ_CTX_INDEX_OFFSET),
269                        ctx->engine->regs + SPA_KEY_SZ_REG_OFFSET);
270         }
271 
272         return indx;
273 }
274 
275 static inline void ddt_set(struct spacc_ddt *ddt, dma_addr_t phys, size_t len)
276 {
277         ddt->p = phys;
278         ddt->len = len;
279 }
280 
281 /*
282  * Take a crypto request and scatterlists for the data and turn them into DDTs
283  * for passing to the crypto engines. This also DMA maps the data so that the
284  * crypto engines can DMA to/from them.
285  */
286 static struct spacc_ddt *spacc_sg_to_ddt(struct spacc_engine *engine,
287                                          struct scatterlist *payload,
288                                          unsigned nbytes,
289                                          enum dma_data_direction dir,
290                                          dma_addr_t *ddt_phys)
291 {
292         unsigned mapped_ents;
293         struct scatterlist *cur;
294         struct spacc_ddt *ddt;
295         int i;
296         int nents;
297 
298         nents = sg_nents_for_len(payload, nbytes);
299         if (nents < 0) {
300                 dev_err(engine->dev, "Invalid numbers of SG.\n");
301                 return NULL;
302         }
303         mapped_ents = dma_map_sg(engine->dev, payload, nents, dir);
304 
305         if (mapped_ents + 1 > MAX_DDT_LEN)
306                 goto out;
307 
308         ddt = dma_pool_alloc(engine->req_pool, GFP_ATOMIC, ddt_phys);
309         if (!ddt)
310                 goto out;
311 
312         for_each_sg(payload, cur, mapped_ents, i)
313                 ddt_set(&ddt[i], sg_dma_address(cur), sg_dma_len(cur));
314         ddt_set(&ddt[mapped_ents], 0, 0);
315 
316         return ddt;
317 
318 out:
319         dma_unmap_sg(engine->dev, payload, nents, dir);
320         return NULL;
321 }
322 
323 static int spacc_aead_make_ddts(struct aead_request *areq)
324 {
325         struct crypto_aead *aead = crypto_aead_reqtfm(areq);
326         struct spacc_req *req = aead_request_ctx(areq);
327         struct spacc_engine *engine = req->engine;
328         struct spacc_ddt *src_ddt, *dst_ddt;
329         unsigned total;
330         int src_nents, dst_nents;
331         struct scatterlist *cur;
332         int i, dst_ents, src_ents;
333 
334         total = areq->assoclen + areq->cryptlen;
335         if (req->is_encrypt)
336                 total += crypto_aead_authsize(aead);
337 
338         src_nents = sg_nents_for_len(areq->src, total);
339         if (src_nents < 0) {
340                 dev_err(engine->dev, "Invalid numbers of src SG.\n");
341                 return src_nents;
342         }
343         if (src_nents + 1 > MAX_DDT_LEN)
344                 return -E2BIG;
345 
346         dst_nents = 0;
347         if (areq->src != areq->dst) {
348                 dst_nents = sg_nents_for_len(areq->dst, total);
349                 if (dst_nents < 0) {
350                         dev_err(engine->dev, "Invalid numbers of dst SG.\n");
351                         return dst_nents;
352                 }
353                 if (src_nents + 1 > MAX_DDT_LEN)
354                         return -E2BIG;
355         }
356 
357         src_ddt = dma_pool_alloc(engine->req_pool, GFP_ATOMIC, &req->src_addr);
358         if (!src_ddt)
359                 goto err;
360 
361         dst_ddt = dma_pool_alloc(engine->req_pool, GFP_ATOMIC, &req->dst_addr);
362         if (!dst_ddt)
363                 goto err_free_src;
364 
365         req->src_ddt = src_ddt;
366         req->dst_ddt = dst_ddt;
367 
368         if (dst_nents) {
369                 src_ents = dma_map_sg(engine->dev, areq->src, src_nents,
370                                       DMA_TO_DEVICE);
371                 if (!src_ents)
372                         goto err_free_dst;
373 
374                 dst_ents = dma_map_sg(engine->dev, areq->dst, dst_nents,
375                                       DMA_FROM_DEVICE);
376 
377                 if (!dst_ents) {
378                         dma_unmap_sg(engine->dev, areq->src, src_nents,
379                                      DMA_TO_DEVICE);
380                         goto err_free_dst;
381                 }
382         } else {
383                 src_ents = dma_map_sg(engine->dev, areq->src, src_nents,
384                                       DMA_BIDIRECTIONAL);
385                 if (!src_ents)
386                         goto err_free_dst;
387                 dst_ents = src_ents;
388         }
389 
390         /*
391          * Now map in the payload for the source and destination and terminate
392          * with the NULL pointers.
393          */
394         for_each_sg(areq->src, cur, src_ents, i)
395                 ddt_set(src_ddt++, sg_dma_address(cur), sg_dma_len(cur));
396 
397         /* For decryption we need to skip the associated data. */
398         total = req->is_encrypt ? 0 : areq->assoclen;
399         for_each_sg(areq->dst, cur, dst_ents, i) {
400                 unsigned len = sg_dma_len(cur);
401 
402                 if (len <= total) {
403                         total -= len;
404                         continue;
405                 }
406 
407                 ddt_set(dst_ddt++, sg_dma_address(cur) + total, len - total);
408         }
409 
410         ddt_set(src_ddt, 0, 0);
411         ddt_set(dst_ddt, 0, 0);
412 
413         return 0;
414 
415 err_free_dst:
416         dma_pool_free(engine->req_pool, dst_ddt, req->dst_addr);
417 err_free_src:
418         dma_pool_free(engine->req_pool, src_ddt, req->src_addr);
419 err:
420         return -ENOMEM;
421 }
422 
423 static void spacc_aead_free_ddts(struct spacc_req *req)
424 {
425         struct aead_request *areq = container_of(req->req, struct aead_request,
426                                                  base);
427         struct crypto_aead *aead = crypto_aead_reqtfm(areq);
428         unsigned total = areq->assoclen + areq->cryptlen +
429                          (req->is_encrypt ? crypto_aead_authsize(aead) : 0);
430         struct spacc_aead_ctx *aead_ctx = crypto_aead_ctx(aead);
431         struct spacc_engine *engine = aead_ctx->generic.engine;
432         int nents = sg_nents_for_len(areq->src, total);
433 
434         /* sg_nents_for_len should not fail since it works when mapping sg */
435         if (unlikely(nents < 0)) {
436                 dev_err(engine->dev, "Invalid numbers of src SG.\n");
437                 return;
438         }
439 
440         if (areq->src != areq->dst) {
441                 dma_unmap_sg(engine->dev, areq->src, nents, DMA_TO_DEVICE);
442                 nents = sg_nents_for_len(areq->dst, total);
443                 if (unlikely(nents < 0)) {
444                         dev_err(engine->dev, "Invalid numbers of dst SG.\n");
445                         return;
446                 }
447                 dma_unmap_sg(engine->dev, areq->dst, nents, DMA_FROM_DEVICE);
448         } else
449                 dma_unmap_sg(engine->dev, areq->src, nents, DMA_BIDIRECTIONAL);
450 
451         dma_pool_free(engine->req_pool, req->src_ddt, req->src_addr);
452         dma_pool_free(engine->req_pool, req->dst_ddt, req->dst_addr);
453 }
454 
455 static void spacc_free_ddt(struct spacc_req *req, struct spacc_ddt *ddt,
456                            dma_addr_t ddt_addr, struct scatterlist *payload,
457                            unsigned nbytes, enum dma_data_direction dir)
458 {
459         int nents = sg_nents_for_len(payload, nbytes);
460 
461         if (nents < 0) {
462                 dev_err(req->engine->dev, "Invalid numbers of SG.\n");
463                 return;
464         }
465 
466         dma_unmap_sg(req->engine->dev, payload, nents, dir);
467         dma_pool_free(req->engine->req_pool, ddt, ddt_addr);
468 }
469 
470 static int spacc_aead_setkey(struct crypto_aead *tfm, const u8 *key,
471                              unsigned int keylen)
472 {
473         struct spacc_aead_ctx *ctx = crypto_aead_ctx(tfm);
474         struct crypto_authenc_keys keys;
475         int err;
476 
477         crypto_aead_clear_flags(ctx->sw_cipher, CRYPTO_TFM_REQ_MASK);
478         crypto_aead_set_flags(ctx->sw_cipher, crypto_aead_get_flags(tfm) &
479                                               CRYPTO_TFM_REQ_MASK);
480         err = crypto_aead_setkey(ctx->sw_cipher, key, keylen);
481         crypto_aead_clear_flags(tfm, CRYPTO_TFM_RES_MASK);
482         crypto_aead_set_flags(tfm, crypto_aead_get_flags(ctx->sw_cipher) &
483                                    CRYPTO_TFM_RES_MASK);
484         if (err)
485                 return err;
486 
487         if (crypto_authenc_extractkeys(&keys, key, keylen) != 0)
488                 goto badkey;
489 
490         if (keys.enckeylen > AES_MAX_KEY_SIZE)
491                 goto badkey;
492 
493         if (keys.authkeylen > sizeof(ctx->hash_ctx))
494                 goto badkey;
495 
496         memcpy(ctx->cipher_key, keys.enckey, keys.enckeylen);
497         ctx->cipher_key_len = keys.enckeylen;
498 
499         memcpy(ctx->hash_ctx, keys.authkey, keys.authkeylen);
500         ctx->hash_key_len = keys.authkeylen;
501 
502         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                 if (!ctx->sw_cipher)
794                         return -EINVAL;
795 
796                 /*
797                  * Set the fallback transform to use the same request flags as
798                  * the hardware transform.
799                  */
800                 crypto_skcipher_clear_flags(ctx->sw_cipher,
801                                             CRYPTO_TFM_REQ_MASK);
802                 crypto_skcipher_set_flags(ctx->sw_cipher,
803                                           cipher->base.crt_flags &
804                                           CRYPTO_TFM_REQ_MASK);
805 
806                 err = crypto_skcipher_setkey(ctx->sw_cipher, key, len);
807 
808                 tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
809                 tfm->crt_flags |=
810                         crypto_skcipher_get_flags(ctx->sw_cipher) &
811                         CRYPTO_TFM_RES_MASK;
812 
813                 if (err)
814                         goto sw_setkey_failed;
815         }
816 
817         memcpy(ctx->key, key, len);
818         ctx->key_len = len;
819 
820 sw_setkey_failed:
821         return err;
822 }
823 
824 static int spacc_kasumi_f8_setkey(struct crypto_ablkcipher *cipher,
825                                   const u8 *key, unsigned int len)
826 {
827         struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
828         struct spacc_ablk_ctx *ctx = crypto_tfm_ctx(tfm);
829         int err = 0;
830 
831         if (len > AES_MAX_KEY_SIZE) {
832                 crypto_ablkcipher_set_flags(cipher, CRYPTO_TFM_RES_BAD_KEY_LEN);
833                 err = -EINVAL;
834                 goto out;
835         }
836 
837         memcpy(ctx->key, key, len);
838         ctx->key_len = len;
839 
840 out:
841         return err;
842 }
843 
844 static int spacc_ablk_need_fallback(struct spacc_req *req)
845 {
846         struct spacc_ablk_ctx *ctx;
847         struct crypto_tfm *tfm = req->req->tfm;
848         struct crypto_alg *alg = req->req->tfm->__crt_alg;
849         struct spacc_alg *spacc_alg = to_spacc_alg(alg);
850 
851         ctx = crypto_tfm_ctx(tfm);
852 
853         return (spacc_alg->ctrl_default & SPACC_CRYPTO_ALG_MASK) ==
854                         SPA_CTRL_CIPH_ALG_AES &&
855                         ctx->key_len != AES_KEYSIZE_128 &&
856                         ctx->key_len != AES_KEYSIZE_256;
857 }
858 
859 static void spacc_ablk_complete(struct spacc_req *req)
860 {
861         struct ablkcipher_request *ablk_req = ablkcipher_request_cast(req->req);
862 
863         if (ablk_req->src != ablk_req->dst) {
864                 spacc_free_ddt(req, req->src_ddt, req->src_addr, ablk_req->src,
865                                ablk_req->nbytes, DMA_TO_DEVICE);
866                 spacc_free_ddt(req, req->dst_ddt, req->dst_addr, ablk_req->dst,
867                                ablk_req->nbytes, DMA_FROM_DEVICE);
868         } else
869                 spacc_free_ddt(req, req->dst_ddt, req->dst_addr, ablk_req->dst,
870                                ablk_req->nbytes, DMA_BIDIRECTIONAL);
871 
872         req->req->complete(req->req, req->result);
873 }
874 
875 static int spacc_ablk_submit(struct spacc_req *req)
876 {
877         struct crypto_tfm *tfm = req->req->tfm;
878         struct spacc_ablk_ctx *ctx = crypto_tfm_ctx(tfm);
879         struct ablkcipher_request *ablk_req = ablkcipher_request_cast(req->req);
880         struct crypto_alg *alg = req->req->tfm->__crt_alg;
881         struct spacc_alg *spacc_alg = to_spacc_alg(alg);
882         struct spacc_engine *engine = ctx->generic.engine;
883         u32 ctrl;
884 
885         req->ctx_id = spacc_load_ctx(&ctx->generic, ctx->key,
886                 ctx->key_len, ablk_req->info, alg->cra_ablkcipher.ivsize,
887                 NULL, 0);
888 
889         writel(req->src_addr, engine->regs + SPA_SRC_PTR_REG_OFFSET);
890         writel(req->dst_addr, engine->regs + SPA_DST_PTR_REG_OFFSET);
891         writel(0, engine->regs + SPA_OFFSET_REG_OFFSET);
892 
893         writel(ablk_req->nbytes, engine->regs + SPA_PROC_LEN_REG_OFFSET);
894         writel(0, engine->regs + SPA_ICV_OFFSET_REG_OFFSET);
895         writel(0, engine->regs + SPA_AUX_INFO_REG_OFFSET);
896         writel(0, engine->regs + SPA_AAD_LEN_REG_OFFSET);
897 
898         ctrl = spacc_alg->ctrl_default | (req->ctx_id << SPA_CTRL_CTX_IDX) |
899                 (req->is_encrypt ? (1 << SPA_CTRL_ENCRYPT_IDX) :
900                  (1 << SPA_CTRL_KEY_EXP));
901 
902         mod_timer(&engine->packet_timeout, jiffies + PACKET_TIMEOUT);
903 
904         writel(ctrl, engine->regs + SPA_CTRL_REG_OFFSET);
905 
906         return -EINPROGRESS;
907 }
908 
909 static int spacc_ablk_do_fallback(struct ablkcipher_request *req,
910                                   unsigned alg_type, bool is_encrypt)
911 {
912         struct crypto_tfm *old_tfm =
913             crypto_ablkcipher_tfm(crypto_ablkcipher_reqtfm(req));
914         struct spacc_ablk_ctx *ctx = crypto_tfm_ctx(old_tfm);
915         SKCIPHER_REQUEST_ON_STACK(subreq, ctx->sw_cipher);
916         int err;
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         skcipher_request_set_tfm(subreq, ctx->sw_cipher);
924         skcipher_request_set_callback(subreq, req->base.flags, NULL, NULL);
925         skcipher_request_set_crypt(subreq, req->src, req->dst,
926                                    req->nbytes, req->info);
927         err = is_encrypt ? crypto_skcipher_encrypt(subreq) :
928                            crypto_skcipher_decrypt(subreq);
929         skcipher_request_zero(subreq);
930 
931         return err;
932 }
933 
934 static int spacc_ablk_setup(struct ablkcipher_request *req, unsigned alg_type,
935                             bool is_encrypt)
936 {
937         struct crypto_alg *alg = req->base.tfm->__crt_alg;
938         struct spacc_engine *engine = to_spacc_alg(alg)->engine;
939         struct spacc_req *dev_req = ablkcipher_request_ctx(req);
940         unsigned long flags;
941         int err = -ENOMEM;
942 
943         dev_req->req            = &req->base;
944         dev_req->is_encrypt     = is_encrypt;
945         dev_req->engine         = engine;
946         dev_req->complete       = spacc_ablk_complete;
947         dev_req->result         = -EINPROGRESS;
948 
949         if (unlikely(spacc_ablk_need_fallback(dev_req)))
950                 return spacc_ablk_do_fallback(req, alg_type, is_encrypt);
951 
952         /*
953          * Create the DDT's for the engine. If we share the same source and
954          * destination then we can optimize by reusing the DDT's.
955          */
956         if (req->src != req->dst) {
957                 dev_req->src_ddt = spacc_sg_to_ddt(engine, req->src,
958                         req->nbytes, DMA_TO_DEVICE, &dev_req->src_addr);
959                 if (!dev_req->src_ddt)
960                         goto out;
961 
962                 dev_req->dst_ddt = spacc_sg_to_ddt(engine, req->dst,
963                         req->nbytes, DMA_FROM_DEVICE, &dev_req->dst_addr);
964                 if (!dev_req->dst_ddt)
965                         goto out_free_src;
966         } else {
967                 dev_req->dst_ddt = spacc_sg_to_ddt(engine, req->dst,
968                         req->nbytes, DMA_BIDIRECTIONAL, &dev_req->dst_addr);
969                 if (!dev_req->dst_ddt)
970                         goto out;
971 
972                 dev_req->src_ddt = NULL;
973                 dev_req->src_addr = dev_req->dst_addr;
974         }
975 
976         err = -EINPROGRESS;
977         spin_lock_irqsave(&engine->hw_lock, flags);
978         /*
979          * Check if the engine will accept the operation now. If it won't then
980          * we either stick it on the end of a pending list if we can backlog,
981          * or bailout with an error if not.
982          */
983         if (unlikely(spacc_fifo_cmd_full(engine)) ||
984             engine->in_flight + 1 > engine->fifo_sz) {
985                 if (!(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
986                         err = -EBUSY;
987                         spin_unlock_irqrestore(&engine->hw_lock, flags);
988                         goto out_free_ddts;
989                 }
990                 list_add_tail(&dev_req->list, &engine->pending);
991         } else {
992                 list_add_tail(&dev_req->list, &engine->pending);
993                 spacc_push(engine);
994         }
995         spin_unlock_irqrestore(&engine->hw_lock, flags);
996 
997         goto out;
998 
999 out_free_ddts:
1000         spacc_free_ddt(dev_req, dev_req->dst_ddt, dev_req->dst_addr, req->dst,
1001                        req->nbytes, req->src == req->dst ?
1002                        DMA_BIDIRECTIONAL : DMA_FROM_DEVICE);
1003 out_free_src:
1004         if (req->src != req->dst)
1005                 spacc_free_ddt(dev_req, dev_req->src_ddt, dev_req->src_addr,
1006                                req->src, req->nbytes, DMA_TO_DEVICE);
1007 out:
1008         return err;
1009 }
1010 
1011 static int spacc_ablk_cra_init(struct crypto_tfm *tfm)
1012 {
1013         struct spacc_ablk_ctx *ctx = crypto_tfm_ctx(tfm);
1014         struct crypto_alg *alg = tfm->__crt_alg;
1015         struct spacc_alg *spacc_alg = to_spacc_alg(alg);
1016         struct spacc_engine *engine = spacc_alg->engine;
1017 
1018         ctx->generic.flags = spacc_alg->type;
1019         ctx->generic.engine = engine;
1020         if (alg->cra_flags & CRYPTO_ALG_NEED_FALLBACK) {
1021                 ctx->sw_cipher = crypto_alloc_skcipher(
1022                         alg->cra_name, 0, CRYPTO_ALG_ASYNC |
1023                                           CRYPTO_ALG_NEED_FALLBACK);
1024                 if (IS_ERR(ctx->sw_cipher)) {
1025                         dev_warn(engine->dev, "failed to allocate fallback for %s\n",
1026                                  alg->cra_name);
1027                         return PTR_ERR(ctx->sw_cipher);
1028                 }
1029         }
1030         ctx->generic.key_offs = spacc_alg->key_offs;
1031         ctx->generic.iv_offs = spacc_alg->iv_offs;
1032 
1033         tfm->crt_ablkcipher.reqsize = sizeof(struct spacc_req);
1034 
1035         return 0;
1036 }
1037 
1038 static void spacc_ablk_cra_exit(struct crypto_tfm *tfm)
1039 {
1040         struct spacc_ablk_ctx *ctx = crypto_tfm_ctx(tfm);
1041 
1042         crypto_free_skcipher(ctx->sw_cipher);
1043 }
1044 
1045 static int spacc_ablk_encrypt(struct ablkcipher_request *req)
1046 {
1047         struct crypto_ablkcipher *cipher = crypto_ablkcipher_reqtfm(req);
1048         struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
1049         struct spacc_alg *alg = to_spacc_alg(tfm->__crt_alg);
1050 
1051         return spacc_ablk_setup(req, alg->type, 1);
1052 }
1053 
1054 static int spacc_ablk_decrypt(struct ablkcipher_request *req)
1055 {
1056         struct crypto_ablkcipher *cipher = crypto_ablkcipher_reqtfm(req);
1057         struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
1058         struct spacc_alg *alg = to_spacc_alg(tfm->__crt_alg);
1059 
1060         return spacc_ablk_setup(req, alg->type, 0);
1061 }
1062 
1063 static inline int spacc_fifo_stat_empty(struct spacc_engine *engine)
1064 {
1065         return readl(engine->regs + SPA_FIFO_STAT_REG_OFFSET) &
1066                 SPA_FIFO_STAT_EMPTY;
1067 }
1068 
1069 static void spacc_process_done(struct spacc_engine *engine)
1070 {
1071         struct spacc_req *req;
1072         unsigned long flags;
1073 
1074         spin_lock_irqsave(&engine->hw_lock, flags);
1075 
1076         while (!spacc_fifo_stat_empty(engine)) {
1077                 req = list_first_entry(&engine->in_progress, struct spacc_req,
1078                                        list);
1079                 list_move_tail(&req->list, &engine->completed);
1080                 --engine->in_flight;
1081 
1082                 /* POP the status register. */
1083                 writel(~0, engine->regs + SPA_STAT_POP_REG_OFFSET);
1084                 req->result = (readl(engine->regs + SPA_STATUS_REG_OFFSET) &
1085                      SPA_STATUS_RES_CODE_MASK) >> SPA_STATUS_RES_CODE_OFFSET;
1086 
1087                 /*
1088                  * Convert the SPAcc error status into the standard POSIX error
1089                  * codes.
1090                  */
1091                 if (unlikely(req->result)) {
1092                         switch (req->result) {
1093                         case SPA_STATUS_ICV_FAIL:
1094                                 req->result = -EBADMSG;
1095                                 break;
1096 
1097                         case SPA_STATUS_MEMORY_ERROR:
1098                                 dev_warn(engine->dev,
1099                                          "memory error triggered\n");
1100                                 req->result = -EFAULT;
1101                                 break;
1102 
1103                         case SPA_STATUS_BLOCK_ERROR:
1104                                 dev_warn(engine->dev,
1105                                          "block error triggered\n");
1106                                 req->result = -EIO;
1107                                 break;
1108                         }
1109                 }
1110         }
1111 
1112         tasklet_schedule(&engine->complete);
1113 
1114         spin_unlock_irqrestore(&engine->hw_lock, flags);
1115 }
1116 
1117 static irqreturn_t spacc_spacc_irq(int irq, void *dev)
1118 {
1119         struct spacc_engine *engine = (struct spacc_engine *)dev;
1120         u32 spacc_irq_stat = readl(engine->regs + SPA_IRQ_STAT_REG_OFFSET);
1121 
1122         writel(spacc_irq_stat, engine->regs + SPA_IRQ_STAT_REG_OFFSET);
1123         spacc_process_done(engine);
1124 
1125         return IRQ_HANDLED;
1126 }
1127 
1128 static void spacc_packet_timeout(unsigned long data)
1129 {
1130         struct spacc_engine *engine = (struct spacc_engine *)data;
1131 
1132         spacc_process_done(engine);
1133 }
1134 
1135 static int spacc_req_submit(struct spacc_req *req)
1136 {
1137         struct crypto_alg *alg = req->req->tfm->__crt_alg;
1138 
1139         if (CRYPTO_ALG_TYPE_AEAD == (CRYPTO_ALG_TYPE_MASK & alg->cra_flags))
1140                 return spacc_aead_submit(req);
1141         else
1142                 return spacc_ablk_submit(req);
1143 }
1144 
1145 static void spacc_spacc_complete(unsigned long data)
1146 {
1147         struct spacc_engine *engine = (struct spacc_engine *)data;
1148         struct spacc_req *req, *tmp;
1149         unsigned long flags;
1150         LIST_HEAD(completed);
1151 
1152         spin_lock_irqsave(&engine->hw_lock, flags);
1153 
1154         list_splice_init(&engine->completed, &completed);
1155         spacc_push(engine);
1156         if (engine->in_flight)
1157                 mod_timer(&engine->packet_timeout, jiffies + PACKET_TIMEOUT);
1158 
1159         spin_unlock_irqrestore(&engine->hw_lock, flags);
1160 
1161         list_for_each_entry_safe(req, tmp, &completed, list) {
1162                 list_del(&req->list);
1163                 req->complete(req);
1164         }
1165 }
1166 
1167 #ifdef CONFIG_PM
1168 static int spacc_suspend(struct device *dev)
1169 {
1170         struct platform_device *pdev = to_platform_device(dev);
1171         struct spacc_engine *engine = platform_get_drvdata(pdev);
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 platform_device *pdev = to_platform_device(dev);
1186         struct spacc_engine *engine = platform_get_drvdata(pdev);
1187 
1188         return clk_enable(engine->clk);
1189 }
1190 
1191 static const struct dev_pm_ops spacc_pm_ops = {
1192         .suspend        = spacc_suspend,
1193         .resume         = spacc_resume,
1194 };
1195 #endif /* CONFIG_PM */
1196 
1197 static inline struct spacc_engine *spacc_dev_to_engine(struct device *dev)
1198 {
1199         return dev ? platform_get_drvdata(to_platform_device(dev)) : NULL;
1200 }
1201 
1202 static ssize_t spacc_stat_irq_thresh_show(struct device *dev,
1203                                           struct device_attribute *attr,
1204                                           char *buf)
1205 {
1206         struct spacc_engine *engine = spacc_dev_to_engine(dev);
1207 
1208         return snprintf(buf, PAGE_SIZE, "%u\n", engine->stat_irq_thresh);
1209 }
1210 
1211 static ssize_t spacc_stat_irq_thresh_store(struct device *dev,
1212                                            struct device_attribute *attr,
1213                                            const char *buf, size_t len)
1214 {
1215         struct spacc_engine *engine = spacc_dev_to_engine(dev);
1216         unsigned long thresh;
1217 
1218         if (kstrtoul(buf, 0, &thresh))
1219                 return -EINVAL;
1220 
1221         thresh = clamp(thresh, 1UL, engine->fifo_sz - 1);
1222 
1223         engine->stat_irq_thresh = thresh;
1224         writel(engine->stat_irq_thresh << SPA_IRQ_CTRL_STAT_CNT_OFFSET,
1225                engine->regs + SPA_IRQ_CTRL_REG_OFFSET);
1226 
1227         return len;
1228 }
1229 static DEVICE_ATTR(stat_irq_thresh, 0644, spacc_stat_irq_thresh_show,
1230                    spacc_stat_irq_thresh_store);
1231 
1232 static struct spacc_alg ipsec_engine_algs[] = {
1233         {
1234                 .ctrl_default = SPA_CTRL_CIPH_ALG_AES | SPA_CTRL_CIPH_MODE_CBC,
1235                 .key_offs = 0,
1236                 .iv_offs = AES_MAX_KEY_SIZE,
1237                 .alg = {
1238                         .cra_name = "cbc(aes)",
1239                         .cra_driver_name = "cbc-aes-picoxcell",
1240                         .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1241                         .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
1242                                      CRYPTO_ALG_KERN_DRIVER_ONLY |
1243                                      CRYPTO_ALG_ASYNC |
1244                                      CRYPTO_ALG_NEED_FALLBACK,
1245                         .cra_blocksize = AES_BLOCK_SIZE,
1246                         .cra_ctxsize = sizeof(struct spacc_ablk_ctx),
1247                         .cra_type = &crypto_ablkcipher_type,
1248                         .cra_module = THIS_MODULE,
1249                         .cra_ablkcipher = {
1250                                 .setkey = spacc_aes_setkey,
1251                                 .encrypt = spacc_ablk_encrypt,
1252                                 .decrypt = spacc_ablk_decrypt,
1253                                 .min_keysize = AES_MIN_KEY_SIZE,
1254                                 .max_keysize = AES_MAX_KEY_SIZE,
1255                                 .ivsize = AES_BLOCK_SIZE,
1256                         },
1257                         .cra_init = spacc_ablk_cra_init,
1258                         .cra_exit = spacc_ablk_cra_exit,
1259                 },
1260         },
1261         {
1262                 .key_offs = 0,
1263                 .iv_offs = AES_MAX_KEY_SIZE,
1264                 .ctrl_default = SPA_CTRL_CIPH_ALG_AES | SPA_CTRL_CIPH_MODE_ECB,
1265                 .alg = {
1266                         .cra_name = "ecb(aes)",
1267                         .cra_driver_name = "ecb-aes-picoxcell",
1268                         .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1269                         .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
1270                                 CRYPTO_ALG_KERN_DRIVER_ONLY |
1271                                 CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK,
1272                         .cra_blocksize = AES_BLOCK_SIZE,
1273                         .cra_ctxsize = sizeof(struct spacc_ablk_ctx),
1274                         .cra_type = &crypto_ablkcipher_type,
1275                         .cra_module = THIS_MODULE,
1276                         .cra_ablkcipher = {
1277                                 .setkey = spacc_aes_setkey,
1278                                 .encrypt = spacc_ablk_encrypt,
1279                                 .decrypt = spacc_ablk_decrypt,
1280                                 .min_keysize = AES_MIN_KEY_SIZE,
1281                                 .max_keysize = AES_MAX_KEY_SIZE,
1282                         },
1283                         .cra_init = spacc_ablk_cra_init,
1284                         .cra_exit = spacc_ablk_cra_exit,
1285                 },
1286         },
1287         {
1288                 .key_offs = DES_BLOCK_SIZE,
1289                 .iv_offs = 0,
1290                 .ctrl_default = SPA_CTRL_CIPH_ALG_DES | SPA_CTRL_CIPH_MODE_CBC,
1291                 .alg = {
1292                         .cra_name = "cbc(des)",
1293                         .cra_driver_name = "cbc-des-picoxcell",
1294                         .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1295                         .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
1296                                         CRYPTO_ALG_ASYNC |
1297                                         CRYPTO_ALG_KERN_DRIVER_ONLY,
1298                         .cra_blocksize = DES_BLOCK_SIZE,
1299                         .cra_ctxsize = sizeof(struct spacc_ablk_ctx),
1300                         .cra_type = &crypto_ablkcipher_type,
1301                         .cra_module = THIS_MODULE,
1302                         .cra_ablkcipher = {
1303                                 .setkey = spacc_des_setkey,
1304                                 .encrypt = spacc_ablk_encrypt,
1305                                 .decrypt = spacc_ablk_decrypt,
1306                                 .min_keysize = DES_KEY_SIZE,
1307                                 .max_keysize = DES_KEY_SIZE,
1308                                 .ivsize = DES_BLOCK_SIZE,
1309                         },
1310                         .cra_init = spacc_ablk_cra_init,
1311                         .cra_exit = spacc_ablk_cra_exit,
1312                 },
1313         },
1314         {
1315                 .key_offs = DES_BLOCK_SIZE,
1316                 .iv_offs = 0,
1317                 .ctrl_default = SPA_CTRL_CIPH_ALG_DES | SPA_CTRL_CIPH_MODE_ECB,
1318                 .alg = {
1319                         .cra_name = "ecb(des)",
1320                         .cra_driver_name = "ecb-des-picoxcell",
1321                         .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1322                         .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
1323                                         CRYPTO_ALG_ASYNC |
1324                                         CRYPTO_ALG_KERN_DRIVER_ONLY,
1325                         .cra_blocksize = DES_BLOCK_SIZE,
1326                         .cra_ctxsize = sizeof(struct spacc_ablk_ctx),
1327                         .cra_type = &crypto_ablkcipher_type,
1328                         .cra_module = THIS_MODULE,
1329                         .cra_ablkcipher = {
1330                                 .setkey = spacc_des_setkey,
1331                                 .encrypt = spacc_ablk_encrypt,
1332                                 .decrypt = spacc_ablk_decrypt,
1333                                 .min_keysize = DES_KEY_SIZE,
1334                                 .max_keysize = DES_KEY_SIZE,
1335                         },
1336                         .cra_init = spacc_ablk_cra_init,
1337                         .cra_exit = spacc_ablk_cra_exit,
1338                 },
1339         },
1340         {
1341                 .key_offs = DES_BLOCK_SIZE,
1342                 .iv_offs = 0,
1343                 .ctrl_default = SPA_CTRL_CIPH_ALG_DES | SPA_CTRL_CIPH_MODE_CBC,
1344                 .alg = {
1345                         .cra_name = "cbc(des3_ede)",
1346                         .cra_driver_name = "cbc-des3-ede-picoxcell",
1347                         .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1348                         .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
1349                                         CRYPTO_ALG_ASYNC |
1350                                         CRYPTO_ALG_KERN_DRIVER_ONLY,
1351                         .cra_blocksize = DES3_EDE_BLOCK_SIZE,
1352                         .cra_ctxsize = sizeof(struct spacc_ablk_ctx),
1353                         .cra_type = &crypto_ablkcipher_type,
1354                         .cra_module = THIS_MODULE,
1355                         .cra_ablkcipher = {
1356                                 .setkey = spacc_des_setkey,
1357                                 .encrypt = spacc_ablk_encrypt,
1358                                 .decrypt = spacc_ablk_decrypt,
1359                                 .min_keysize = DES3_EDE_KEY_SIZE,
1360                                 .max_keysize = DES3_EDE_KEY_SIZE,
1361                                 .ivsize = DES3_EDE_BLOCK_SIZE,
1362                         },
1363                         .cra_init = spacc_ablk_cra_init,
1364                         .cra_exit = spacc_ablk_cra_exit,
1365                 },
1366         },
1367         {
1368                 .key_offs = DES_BLOCK_SIZE,
1369                 .iv_offs = 0,
1370                 .ctrl_default = SPA_CTRL_CIPH_ALG_DES | SPA_CTRL_CIPH_MODE_ECB,
1371                 .alg = {
1372                         .cra_name = "ecb(des3_ede)",
1373                         .cra_driver_name = "ecb-des3-ede-picoxcell",
1374                         .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1375                         .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
1376                                         CRYPTO_ALG_ASYNC |
1377                                         CRYPTO_ALG_KERN_DRIVER_ONLY,
1378                         .cra_blocksize = DES3_EDE_BLOCK_SIZE,
1379                         .cra_ctxsize = sizeof(struct spacc_ablk_ctx),
1380                         .cra_type = &crypto_ablkcipher_type,
1381                         .cra_module = THIS_MODULE,
1382                         .cra_ablkcipher = {
1383                                 .setkey = spacc_des_setkey,
1384                                 .encrypt = spacc_ablk_encrypt,
1385                                 .decrypt = spacc_ablk_decrypt,
1386                                 .min_keysize = DES3_EDE_KEY_SIZE,
1387                                 .max_keysize = DES3_EDE_KEY_SIZE,
1388                         },
1389                         .cra_init = spacc_ablk_cra_init,
1390                         .cra_exit = spacc_ablk_cra_exit,
1391                 },
1392         },
1393 };
1394 
1395 static struct spacc_aead ipsec_engine_aeads[] = {
1396         {
1397                 .ctrl_default = SPA_CTRL_CIPH_ALG_AES |
1398                                 SPA_CTRL_CIPH_MODE_CBC |
1399                                 SPA_CTRL_HASH_ALG_SHA |
1400                                 SPA_CTRL_HASH_MODE_HMAC,
1401                 .key_offs = 0,
1402                 .iv_offs = AES_MAX_KEY_SIZE,
1403                 .alg = {
1404                         .base = {
1405                                 .cra_name = "authenc(hmac(sha1),cbc(aes))",
1406                                 .cra_driver_name = "authenc-hmac-sha1-"
1407                                                    "cbc-aes-picoxcell",
1408                                 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1409                                 .cra_flags = CRYPTO_ALG_ASYNC |
1410                                              CRYPTO_ALG_NEED_FALLBACK |
1411                                              CRYPTO_ALG_KERN_DRIVER_ONLY,
1412                                 .cra_blocksize = AES_BLOCK_SIZE,
1413                                 .cra_ctxsize = sizeof(struct spacc_aead_ctx),
1414                                 .cra_module = THIS_MODULE,
1415                         },
1416                         .setkey = spacc_aead_setkey,
1417                         .setauthsize = spacc_aead_setauthsize,
1418                         .encrypt = spacc_aead_encrypt,
1419                         .decrypt = spacc_aead_decrypt,
1420                         .ivsize = AES_BLOCK_SIZE,
1421                         .maxauthsize = SHA1_DIGEST_SIZE,
1422                         .init = spacc_aead_cra_init,
1423                         .exit = spacc_aead_cra_exit,
1424                 },
1425         },
1426         {
1427                 .ctrl_default = SPA_CTRL_CIPH_ALG_AES |
1428                                 SPA_CTRL_CIPH_MODE_CBC |
1429                                 SPA_CTRL_HASH_ALG_SHA256 |
1430                                 SPA_CTRL_HASH_MODE_HMAC,
1431                 .key_offs = 0,
1432                 .iv_offs = AES_MAX_KEY_SIZE,
1433                 .alg = {
1434                         .base = {
1435                                 .cra_name = "authenc(hmac(sha256),cbc(aes))",
1436                                 .cra_driver_name = "authenc-hmac-sha256-"
1437                                                    "cbc-aes-picoxcell",
1438                                 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1439                                 .cra_flags = CRYPTO_ALG_ASYNC |
1440                                              CRYPTO_ALG_NEED_FALLBACK |
1441                                              CRYPTO_ALG_KERN_DRIVER_ONLY,
1442                                 .cra_blocksize = AES_BLOCK_SIZE,
1443                                 .cra_ctxsize = sizeof(struct spacc_aead_ctx),
1444                                 .cra_module = THIS_MODULE,
1445                         },
1446                         .setkey = spacc_aead_setkey,
1447                         .setauthsize = spacc_aead_setauthsize,
1448                         .encrypt = spacc_aead_encrypt,
1449                         .decrypt = spacc_aead_decrypt,
1450                         .ivsize = AES_BLOCK_SIZE,
1451                         .maxauthsize = SHA256_DIGEST_SIZE,
1452                         .init = spacc_aead_cra_init,
1453                         .exit = spacc_aead_cra_exit,
1454                 },
1455         },
1456         {
1457                 .key_offs = 0,
1458                 .iv_offs = AES_MAX_KEY_SIZE,
1459                 .ctrl_default = SPA_CTRL_CIPH_ALG_AES |
1460                                 SPA_CTRL_CIPH_MODE_CBC |
1461                                 SPA_CTRL_HASH_ALG_MD5 |
1462                                 SPA_CTRL_HASH_MODE_HMAC,
1463                 .alg = {
1464                         .base = {
1465                                 .cra_name = "authenc(hmac(md5),cbc(aes))",
1466                                 .cra_driver_name = "authenc-hmac-md5-"
1467                                                    "cbc-aes-picoxcell",
1468                                 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1469                                 .cra_flags = CRYPTO_ALG_ASYNC |
1470                                              CRYPTO_ALG_NEED_FALLBACK |
1471                                              CRYPTO_ALG_KERN_DRIVER_ONLY,
1472                                 .cra_blocksize = AES_BLOCK_SIZE,
1473                                 .cra_ctxsize = sizeof(struct spacc_aead_ctx),
1474                                 .cra_module = THIS_MODULE,
1475                         },
1476                         .setkey = spacc_aead_setkey,
1477                         .setauthsize = spacc_aead_setauthsize,
1478                         .encrypt = spacc_aead_encrypt,
1479                         .decrypt = spacc_aead_decrypt,
1480                         .ivsize = AES_BLOCK_SIZE,
1481                         .maxauthsize = MD5_DIGEST_SIZE,
1482                         .init = spacc_aead_cra_init,
1483                         .exit = spacc_aead_cra_exit,
1484                 },
1485         },
1486         {
1487                 .key_offs = DES_BLOCK_SIZE,
1488                 .iv_offs = 0,
1489                 .ctrl_default = SPA_CTRL_CIPH_ALG_DES |
1490                                 SPA_CTRL_CIPH_MODE_CBC |
1491                                 SPA_CTRL_HASH_ALG_SHA |
1492                                 SPA_CTRL_HASH_MODE_HMAC,
1493                 .alg = {
1494                         .base = {
1495                                 .cra_name = "authenc(hmac(sha1),cbc(des3_ede))",
1496                                 .cra_driver_name = "authenc-hmac-sha1-"
1497                                                    "cbc-3des-picoxcell",
1498                                 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1499                                 .cra_flags = CRYPTO_ALG_ASYNC |
1500                                              CRYPTO_ALG_NEED_FALLBACK |
1501                                              CRYPTO_ALG_KERN_DRIVER_ONLY,
1502                                 .cra_blocksize = DES3_EDE_BLOCK_SIZE,
1503                                 .cra_ctxsize = sizeof(struct spacc_aead_ctx),
1504                                 .cra_module = THIS_MODULE,
1505                         },
1506                         .setkey = spacc_aead_setkey,
1507                         .setauthsize = spacc_aead_setauthsize,
1508                         .encrypt = spacc_aead_encrypt,
1509                         .decrypt = spacc_aead_decrypt,
1510                         .ivsize = DES3_EDE_BLOCK_SIZE,
1511                         .maxauthsize = SHA1_DIGEST_SIZE,
1512                         .init = spacc_aead_cra_init,
1513                         .exit = spacc_aead_cra_exit,
1514                 },
1515         },
1516         {
1517                 .key_offs = DES_BLOCK_SIZE,
1518                 .iv_offs = 0,
1519                 .ctrl_default = SPA_CTRL_CIPH_ALG_AES |
1520                                 SPA_CTRL_CIPH_MODE_CBC |
1521                                 SPA_CTRL_HASH_ALG_SHA256 |
1522                                 SPA_CTRL_HASH_MODE_HMAC,
1523                 .alg = {
1524                         .base = {
1525                                 .cra_name = "authenc(hmac(sha256),"
1526                                             "cbc(des3_ede))",
1527                                 .cra_driver_name = "authenc-hmac-sha256-"
1528                                                    "cbc-3des-picoxcell",
1529                                 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1530                                 .cra_flags = CRYPTO_ALG_ASYNC |
1531                                              CRYPTO_ALG_NEED_FALLBACK |
1532                                              CRYPTO_ALG_KERN_DRIVER_ONLY,
1533                                 .cra_blocksize = DES3_EDE_BLOCK_SIZE,
1534                                 .cra_ctxsize = sizeof(struct spacc_aead_ctx),
1535                                 .cra_module = THIS_MODULE,
1536                         },
1537                         .setkey = spacc_aead_setkey,
1538                         .setauthsize = spacc_aead_setauthsize,
1539                         .encrypt = spacc_aead_encrypt,
1540                         .decrypt = spacc_aead_decrypt,
1541                         .ivsize = DES3_EDE_BLOCK_SIZE,
1542                         .maxauthsize = SHA256_DIGEST_SIZE,
1543                         .init = spacc_aead_cra_init,
1544                         .exit = spacc_aead_cra_exit,
1545                 },
1546         },
1547         {
1548                 .key_offs = DES_BLOCK_SIZE,
1549                 .iv_offs = 0,
1550                 .ctrl_default = SPA_CTRL_CIPH_ALG_DES |
1551                                 SPA_CTRL_CIPH_MODE_CBC |
1552                                 SPA_CTRL_HASH_ALG_MD5 |
1553                                 SPA_CTRL_HASH_MODE_HMAC,
1554                 .alg = {
1555                         .base = {
1556                                 .cra_name = "authenc(hmac(md5),cbc(des3_ede))",
1557                                 .cra_driver_name = "authenc-hmac-md5-"
1558                                                    "cbc-3des-picoxcell",
1559                                 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1560                                 .cra_flags = CRYPTO_ALG_ASYNC |
1561                                              CRYPTO_ALG_NEED_FALLBACK |
1562                                              CRYPTO_ALG_KERN_DRIVER_ONLY,
1563                                 .cra_blocksize = DES3_EDE_BLOCK_SIZE,
1564                                 .cra_ctxsize = sizeof(struct spacc_aead_ctx),
1565                                 .cra_module = THIS_MODULE,
1566                         },
1567                         .setkey = spacc_aead_setkey,
1568                         .setauthsize = spacc_aead_setauthsize,
1569                         .encrypt = spacc_aead_encrypt,
1570                         .decrypt = spacc_aead_decrypt,
1571                         .ivsize = DES3_EDE_BLOCK_SIZE,
1572                         .maxauthsize = MD5_DIGEST_SIZE,
1573                         .init = spacc_aead_cra_init,
1574                         .exit = spacc_aead_cra_exit,
1575                 },
1576         },
1577 };
1578 
1579 static struct spacc_alg l2_engine_algs[] = {
1580         {
1581                 .key_offs = 0,
1582                 .iv_offs = SPACC_CRYPTO_KASUMI_F8_KEY_LEN,
1583                 .ctrl_default = SPA_CTRL_CIPH_ALG_KASUMI |
1584                                 SPA_CTRL_CIPH_MODE_F8,
1585                 .alg = {
1586                         .cra_name = "f8(kasumi)",
1587                         .cra_driver_name = "f8-kasumi-picoxcell",
1588                         .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1589                         .cra_flags = CRYPTO_ALG_TYPE_GIVCIPHER |
1590                                         CRYPTO_ALG_ASYNC |
1591                                         CRYPTO_ALG_KERN_DRIVER_ONLY,
1592                         .cra_blocksize = 8,
1593                         .cra_ctxsize = sizeof(struct spacc_ablk_ctx),
1594                         .cra_type = &crypto_ablkcipher_type,
1595                         .cra_module = THIS_MODULE,
1596                         .cra_ablkcipher = {
1597                                 .setkey = spacc_kasumi_f8_setkey,
1598                                 .encrypt = spacc_ablk_encrypt,
1599                                 .decrypt = spacc_ablk_decrypt,
1600                                 .min_keysize = 16,
1601                                 .max_keysize = 16,
1602                                 .ivsize = 8,
1603                         },
1604                         .cra_init = spacc_ablk_cra_init,
1605                         .cra_exit = spacc_ablk_cra_exit,
1606                 },
1607         },
1608 };
1609 
1610 #ifdef CONFIG_OF
1611 static const struct of_device_id spacc_of_id_table[] = {
1612         { .compatible = "picochip,spacc-ipsec" },
1613         { .compatible = "picochip,spacc-l2" },
1614         {}
1615 };
1616 MODULE_DEVICE_TABLE(of, spacc_of_id_table);
1617 #endif /* CONFIG_OF */
1618 
1619 static bool spacc_is_compatible(struct platform_device *pdev,
1620                                 const char *spacc_type)
1621 {
1622         const struct platform_device_id *platid = platform_get_device_id(pdev);
1623 
1624         if (platid && !strcmp(platid->name, spacc_type))
1625                 return true;
1626 
1627 #ifdef CONFIG_OF
1628         if (of_device_is_compatible(pdev->dev.of_node, spacc_type))
1629                 return true;
1630 #endif /* CONFIG_OF */
1631 
1632         return false;
1633 }
1634 
1635 static int spacc_probe(struct platform_device *pdev)
1636 {
1637         int i, err, ret = -EINVAL;
1638         struct resource *mem, *irq;
1639         struct spacc_engine *engine = devm_kzalloc(&pdev->dev, sizeof(*engine),
1640                                                    GFP_KERNEL);
1641         if (!engine)
1642                 return -ENOMEM;
1643 
1644         if (spacc_is_compatible(pdev, "picochip,spacc-ipsec")) {
1645                 engine->max_ctxs        = SPACC_CRYPTO_IPSEC_MAX_CTXS;
1646                 engine->cipher_pg_sz    = SPACC_CRYPTO_IPSEC_CIPHER_PG_SZ;
1647                 engine->hash_pg_sz      = SPACC_CRYPTO_IPSEC_HASH_PG_SZ;
1648                 engine->fifo_sz         = SPACC_CRYPTO_IPSEC_FIFO_SZ;
1649                 engine->algs            = ipsec_engine_algs;
1650                 engine->num_algs        = ARRAY_SIZE(ipsec_engine_algs);
1651                 engine->aeads           = ipsec_engine_aeads;
1652                 engine->num_aeads       = ARRAY_SIZE(ipsec_engine_aeads);
1653         } else if (spacc_is_compatible(pdev, "picochip,spacc-l2")) {
1654                 engine->max_ctxs        = SPACC_CRYPTO_L2_MAX_CTXS;
1655                 engine->cipher_pg_sz    = SPACC_CRYPTO_L2_CIPHER_PG_SZ;
1656                 engine->hash_pg_sz      = SPACC_CRYPTO_L2_HASH_PG_SZ;
1657                 engine->fifo_sz         = SPACC_CRYPTO_L2_FIFO_SZ;
1658                 engine->algs            = l2_engine_algs;
1659                 engine->num_algs        = ARRAY_SIZE(l2_engine_algs);
1660         } else {
1661                 return -EINVAL;
1662         }
1663 
1664         engine->name = dev_name(&pdev->dev);
1665 
1666         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1667         engine->regs = devm_ioremap_resource(&pdev->dev, mem);
1668         if (IS_ERR(engine->regs))
1669                 return PTR_ERR(engine->regs);
1670 
1671         irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1672         if (!irq) {
1673                 dev_err(&pdev->dev, "no memory/irq resource for engine\n");
1674                 return -ENXIO;
1675         }
1676 
1677         if (devm_request_irq(&pdev->dev, irq->start, spacc_spacc_irq, 0,
1678                              engine->name, engine)) {
1679                 dev_err(engine->dev, "failed to request IRQ\n");
1680                 return -EBUSY;
1681         }
1682 
1683         engine->dev             = &pdev->dev;
1684         engine->cipher_ctx_base = engine->regs + SPA_CIPH_KEY_BASE_REG_OFFSET;
1685         engine->hash_key_base   = engine->regs + SPA_HASH_KEY_BASE_REG_OFFSET;
1686 
1687         engine->req_pool = dmam_pool_create(engine->name, engine->dev,
1688                 MAX_DDT_LEN * sizeof(struct spacc_ddt), 8, SZ_64K);
1689         if (!engine->req_pool)
1690                 return -ENOMEM;
1691 
1692         spin_lock_init(&engine->hw_lock);
1693 
1694         engine->clk = clk_get(&pdev->dev, "ref");
1695         if (IS_ERR(engine->clk)) {
1696                 dev_info(&pdev->dev, "clk unavailable\n");
1697                 device_remove_file(&pdev->dev, &dev_attr_stat_irq_thresh);
1698                 return PTR_ERR(engine->clk);
1699         }
1700 
1701         if (clk_prepare_enable(engine->clk)) {
1702                 dev_info(&pdev->dev, "unable to prepare/enable clk\n");
1703                 clk_put(engine->clk);
1704                 return -EIO;
1705         }
1706 
1707         err = device_create_file(&pdev->dev, &dev_attr_stat_irq_thresh);
1708         if (err) {
1709                 clk_disable_unprepare(engine->clk);
1710                 clk_put(engine->clk);
1711                 return err;
1712         }
1713 
1714 
1715         /*
1716          * Use an IRQ threshold of 50% as a default. This seems to be a
1717          * reasonable trade off of latency against throughput but can be
1718          * changed at runtime.
1719          */
1720         engine->stat_irq_thresh = (engine->fifo_sz / 2);
1721 
1722         /*
1723          * Configure the interrupts. We only use the STAT_CNT interrupt as we
1724          * only submit a new packet for processing when we complete another in
1725          * the queue. This minimizes time spent in the interrupt handler.
1726          */
1727         writel(engine->stat_irq_thresh << SPA_IRQ_CTRL_STAT_CNT_OFFSET,
1728                engine->regs + SPA_IRQ_CTRL_REG_OFFSET);
1729         writel(SPA_IRQ_EN_STAT_EN | SPA_IRQ_EN_GLBL_EN,
1730                engine->regs + SPA_IRQ_EN_REG_OFFSET);
1731 
1732         setup_timer(&engine->packet_timeout, spacc_packet_timeout,
1733                     (unsigned long)engine);
1734 
1735         INIT_LIST_HEAD(&engine->pending);
1736         INIT_LIST_HEAD(&engine->completed);
1737         INIT_LIST_HEAD(&engine->in_progress);
1738         engine->in_flight = 0;
1739         tasklet_init(&engine->complete, spacc_spacc_complete,
1740                      (unsigned long)engine);
1741 
1742         platform_set_drvdata(pdev, engine);
1743 
1744         INIT_LIST_HEAD(&engine->registered_algs);
1745         for (i = 0; i < engine->num_algs; ++i) {
1746                 engine->algs[i].engine = engine;
1747                 err = crypto_register_alg(&engine->algs[i].alg);
1748                 if (!err) {
1749                         list_add_tail(&engine->algs[i].entry,
1750                                       &engine->registered_algs);
1751                         ret = 0;
1752                 }
1753                 if (err)
1754                         dev_err(engine->dev, "failed to register alg \"%s\"\n",
1755                                 engine->algs[i].alg.cra_name);
1756                 else
1757                         dev_dbg(engine->dev, "registered alg \"%s\"\n",
1758                                 engine->algs[i].alg.cra_name);
1759         }
1760 
1761         INIT_LIST_HEAD(&engine->registered_aeads);
1762         for (i = 0; i < engine->num_aeads; ++i) {
1763                 engine->aeads[i].engine = engine;
1764                 err = crypto_register_aead(&engine->aeads[i].alg);
1765                 if (!err) {
1766                         list_add_tail(&engine->aeads[i].entry,
1767                                       &engine->registered_aeads);
1768                         ret = 0;
1769                 }
1770                 if (err)
1771                         dev_err(engine->dev, "failed to register alg \"%s\"\n",
1772                                 engine->aeads[i].alg.base.cra_name);
1773                 else
1774                         dev_dbg(engine->dev, "registered alg \"%s\"\n",
1775                                 engine->aeads[i].alg.base.cra_name);
1776         }
1777 
1778         return ret;
1779 }
1780 
1781 static int spacc_remove(struct platform_device *pdev)
1782 {
1783         struct spacc_aead *aead, *an;
1784         struct spacc_alg *alg, *next;
1785         struct spacc_engine *engine = platform_get_drvdata(pdev);
1786 
1787         del_timer_sync(&engine->packet_timeout);
1788         device_remove_file(&pdev->dev, &dev_attr_stat_irq_thresh);
1789 
1790         list_for_each_entry_safe(aead, an, &engine->registered_aeads, entry) {
1791                 list_del(&aead->entry);
1792                 crypto_unregister_aead(&aead->alg);
1793         }
1794 
1795         list_for_each_entry_safe(alg, next, &engine->registered_algs, entry) {
1796                 list_del(&alg->entry);
1797                 crypto_unregister_alg(&alg->alg);
1798         }
1799 
1800         clk_disable_unprepare(engine->clk);
1801         clk_put(engine->clk);
1802 
1803         return 0;
1804 }
1805 
1806 static const struct platform_device_id spacc_id_table[] = {
1807         { "picochip,spacc-ipsec", },
1808         { "picochip,spacc-l2", },
1809         { }
1810 };
1811 
1812 static struct platform_driver spacc_driver = {
1813         .probe          = spacc_probe,
1814         .remove         = spacc_remove,
1815         .driver         = {
1816                 .name   = "picochip,spacc",
1817 #ifdef CONFIG_PM
1818                 .pm     = &spacc_pm_ops,
1819 #endif /* CONFIG_PM */
1820                 .of_match_table = of_match_ptr(spacc_of_id_table),
1821         },
1822         .id_table       = spacc_id_table,
1823 };
1824 
1825 module_platform_driver(spacc_driver);
1826 
1827 MODULE_LICENSE("GPL");
1828 MODULE_AUTHOR("Jamie Iles");
1829 

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