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/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/slab.h>
44 #include <linux/timer.h>
45
46 #include "picoxcell_crypto_regs.h"
47
48 /*
49 * The threshold for the number of entries in the CMD FIFO available before
50 * the CMD0_CNT interrupt is raised. Increasing this value will reduce the
51 * number of interrupts raised to the CPU.
52 */
53 #define CMD0_IRQ_THRESHOLD 1
54
55 /*
56 * The timeout period (in jiffies) for a PDU. When the the number of PDUs in
57 * flight is greater than the STAT_IRQ_THRESHOLD or 0 the timer is disabled.
58 * When there are packets in flight but lower than the threshold, we enable
59 * the timer and at expiry, attempt to remove any processed packets from the
60 * queue and if there are still packets left, schedule the timer again.
61 */
62 #define PACKET_TIMEOUT 1
63
64 /* The priority to register each algorithm with. */
65 #define SPACC_CRYPTO_ALG_PRIORITY 10000
66
67 #define SPACC_CRYPTO_KASUMI_F8_KEY_LEN 16
68 #define SPACC_CRYPTO_IPSEC_CIPHER_PG_SZ 64
69 #define SPACC_CRYPTO_IPSEC_HASH_PG_SZ 64
70 #define SPACC_CRYPTO_IPSEC_MAX_CTXS 32
71 #define SPACC_CRYPTO_IPSEC_FIFO_SZ 32
72 #define SPACC_CRYPTO_L2_CIPHER_PG_SZ 64
73 #define SPACC_CRYPTO_L2_HASH_PG_SZ 64
74 #define SPACC_CRYPTO_L2_MAX_CTXS 128
75 #define SPACC_CRYPTO_L2_FIFO_SZ 128
76
77 #define MAX_DDT_LEN 16
78
79 /* DDT format. This must match the hardware DDT format exactly. */
80 struct spacc_ddt {
81 dma_addr_t p;
82 u32 len;
83 };
84
85 /*
86 * Asynchronous crypto request structure.
87 *
88 * This structure defines a request that is either queued for processing or
89 * being processed.
90 */
91 struct spacc_req {
92 struct list_head list;
93 struct spacc_engine *engine;
94 struct crypto_async_request *req;
95 int result;
96 bool is_encrypt;
97 unsigned ctx_id;
98 dma_addr_t src_addr, dst_addr;
99 struct spacc_ddt *src_ddt, *dst_ddt;
100 void (*complete)(struct spacc_req *req);
101
102 /* AEAD specific bits. */
103 u8 *giv;
104 size_t giv_len;
105 dma_addr_t giv_pa;
106 };
107
108 struct spacc_engine {
109 void __iomem *regs;
110 struct list_head pending;
111 int next_ctx;
112 spinlock_t hw_lock;
113 int in_flight;
114 struct list_head completed;
115 struct list_head in_progress;
116 struct tasklet_struct complete;
117 unsigned long fifo_sz;
118 void __iomem *cipher_ctx_base;
119 void __iomem *hash_key_base;
120 struct spacc_alg *algs;
121 unsigned num_algs;
122 struct list_head registered_algs;
123 size_t cipher_pg_sz;
124 size_t hash_pg_sz;
125 const char *name;
126 struct clk *clk;
127 struct device *dev;
128 unsigned max_ctxs;
129 struct timer_list packet_timeout;
130 unsigned stat_irq_thresh;
131 struct dma_pool *req_pool;
132 };
133
134 /* Algorithm type mask. */
135 #define SPACC_CRYPTO_ALG_MASK 0x7
136
137 /* SPACC definition of a crypto algorithm. */
138 struct spacc_alg {
139 unsigned long ctrl_default;
140 unsigned long type;
141 struct crypto_alg alg;
142 struct spacc_engine *engine;
143 struct list_head entry;
144 int key_offs;
145 int iv_offs;
146 };
147
148 /* Generic context structure for any algorithm type. */
149 struct spacc_generic_ctx {
150 struct spacc_engine *engine;
151 int flags;
152 int key_offs;
153 int iv_offs;
154 };
155
156 /* Block cipher context. */
157 struct spacc_ablk_ctx {
158 struct spacc_generic_ctx generic;
159 u8 key[AES_MAX_KEY_SIZE];
160 u8 key_len;
161 /*
162 * The fallback cipher. If the operation can't be done in hardware,
163 * fallback to a software version.
164 */
165 struct crypto_ablkcipher *sw_cipher;
166 };
167
168 /* AEAD cipher context. */
169 struct spacc_aead_ctx {
170 struct spacc_generic_ctx generic;
171 u8 cipher_key[AES_MAX_KEY_SIZE];
172 u8 hash_ctx[SPACC_CRYPTO_IPSEC_HASH_PG_SZ];
173 u8 cipher_key_len;
174 u8 hash_key_len;
175 struct crypto_aead *sw_cipher;
176 size_t auth_size;
177 u8 salt[AES_BLOCK_SIZE];
178 };
179
180 static int spacc_ablk_submit(struct spacc_req *req);
181
to_spacc_alg(struct crypto_alg * alg)182 static inline struct spacc_alg *to_spacc_alg(struct crypto_alg *alg)
183 {
184 return alg ? container_of(alg, struct spacc_alg, alg) : NULL;
185 }
186
spacc_fifo_cmd_full(struct spacc_engine * engine)187 static inline int spacc_fifo_cmd_full(struct spacc_engine *engine)
188 {
189 u32 fifo_stat = readl(engine->regs + SPA_FIFO_STAT_REG_OFFSET);
190
191 return fifo_stat & SPA_FIFO_CMD_FULL;
192 }
193
194 /*
195 * Given a cipher context, and a context number, get the base address of the
196 * context page.
197 *
198 * Returns the address of the context page where the key/context may
199 * be written.
200 */
spacc_ctx_page_addr(struct spacc_generic_ctx * ctx,unsigned indx,bool is_cipher_ctx)201 static inline void __iomem *spacc_ctx_page_addr(struct spacc_generic_ctx *ctx,
202 unsigned indx,
203 bool is_cipher_ctx)
204 {
205 return is_cipher_ctx ? ctx->engine->cipher_ctx_base +
206 (indx * ctx->engine->cipher_pg_sz) :
207 ctx->engine->hash_key_base + (indx * ctx->engine->hash_pg_sz);
208 }
209
210 /* The context pages can only be written with 32-bit accesses. */
memcpy_toio32(u32 __iomem * dst,const void * src,unsigned count)211 static inline void memcpy_toio32(u32 __iomem *dst, const void *src,
212 unsigned count)
213 {
214 const u32 *src32 = (const u32 *) src;
215
216 while (count--)
217 writel(*src32++, dst++);
218 }
219
spacc_cipher_write_ctx(struct spacc_generic_ctx * ctx,void __iomem * page_addr,const u8 * key,size_t key_len,const u8 * iv,size_t iv_len)220 static void spacc_cipher_write_ctx(struct spacc_generic_ctx *ctx,
221 void __iomem *page_addr, const u8 *key,
222 size_t key_len, const u8 *iv, size_t iv_len)
223 {
224 void __iomem *key_ptr = page_addr + ctx->key_offs;
225 void __iomem *iv_ptr = page_addr + ctx->iv_offs;
226
227 memcpy_toio32(key_ptr, key, key_len / 4);
228 memcpy_toio32(iv_ptr, iv, iv_len / 4);
229 }
230
231 /*
232 * Load a context into the engines context memory.
233 *
234 * Returns the index of the context page where the context was loaded.
235 */
spacc_load_ctx(struct spacc_generic_ctx * ctx,const u8 * ciph_key,size_t ciph_len,const u8 * iv,size_t ivlen,const u8 * hash_key,size_t hash_len)236 static unsigned spacc_load_ctx(struct spacc_generic_ctx *ctx,
237 const u8 *ciph_key, size_t ciph_len,
238 const u8 *iv, size_t ivlen, const u8 *hash_key,
239 size_t hash_len)
240 {
241 unsigned indx = ctx->engine->next_ctx++;
242 void __iomem *ciph_page_addr, *hash_page_addr;
243
244 ciph_page_addr = spacc_ctx_page_addr(ctx, indx, 1);
245 hash_page_addr = spacc_ctx_page_addr(ctx, indx, 0);
246
247 ctx->engine->next_ctx &= ctx->engine->fifo_sz - 1;
248 spacc_cipher_write_ctx(ctx, ciph_page_addr, ciph_key, ciph_len, iv,
249 ivlen);
250 writel(ciph_len | (indx << SPA_KEY_SZ_CTX_INDEX_OFFSET) |
251 (1 << SPA_KEY_SZ_CIPHER_OFFSET),
252 ctx->engine->regs + SPA_KEY_SZ_REG_OFFSET);
253
254 if (hash_key) {
255 memcpy_toio32(hash_page_addr, hash_key, hash_len / 4);
256 writel(hash_len | (indx << SPA_KEY_SZ_CTX_INDEX_OFFSET),
257 ctx->engine->regs + SPA_KEY_SZ_REG_OFFSET);
258 }
259
260 return indx;
261 }
262
263 /* Count the number of scatterlist entries in a scatterlist. */
sg_count(struct scatterlist * sg_list,int nbytes)264 static int sg_count(struct scatterlist *sg_list, int nbytes)
265 {
266 struct scatterlist *sg = sg_list;
267 int sg_nents = 0;
268
269 while (nbytes > 0) {
270 ++sg_nents;
271 nbytes -= sg->length;
272 sg = sg_next(sg);
273 }
274
275 return sg_nents;
276 }
277
ddt_set(struct spacc_ddt * ddt,dma_addr_t phys,size_t len)278 static inline void ddt_set(struct spacc_ddt *ddt, dma_addr_t phys, size_t len)
279 {
280 ddt->p = phys;
281 ddt->len = len;
282 }
283
284 /*
285 * Take a crypto request and scatterlists for the data and turn them into DDTs
286 * for passing to the crypto engines. This also DMA maps the data so that the
287 * crypto engines can DMA to/from them.
288 */
spacc_sg_to_ddt(struct spacc_engine * engine,struct scatterlist * payload,unsigned nbytes,enum dma_data_direction dir,dma_addr_t * ddt_phys)289 static struct spacc_ddt *spacc_sg_to_ddt(struct spacc_engine *engine,
290 struct scatterlist *payload,
291 unsigned nbytes,
292 enum dma_data_direction dir,
293 dma_addr_t *ddt_phys)
294 {
295 unsigned nents, mapped_ents;
296 struct scatterlist *cur;
297 struct spacc_ddt *ddt;
298 int i;
299
300 nents = sg_count(payload, nbytes);
301 mapped_ents = dma_map_sg(engine->dev, payload, nents, dir);
302
303 if (mapped_ents + 1 > MAX_DDT_LEN)
304 goto out;
305
306 ddt = dma_pool_alloc(engine->req_pool, GFP_ATOMIC, ddt_phys);
307 if (!ddt)
308 goto out;
309
310 for_each_sg(payload, cur, mapped_ents, i)
311 ddt_set(&ddt[i], sg_dma_address(cur), sg_dma_len(cur));
312 ddt_set(&ddt[mapped_ents], 0, 0);
313
314 return ddt;
315
316 out:
317 dma_unmap_sg(engine->dev, payload, nents, dir);
318 return NULL;
319 }
320
spacc_aead_make_ddts(struct spacc_req * req,u8 * giv)321 static int spacc_aead_make_ddts(struct spacc_req *req, u8 *giv)
322 {
323 struct aead_request *areq = container_of(req->req, struct aead_request,
324 base);
325 struct spacc_engine *engine = req->engine;
326 struct spacc_ddt *src_ddt, *dst_ddt;
327 unsigned ivsize = crypto_aead_ivsize(crypto_aead_reqtfm(areq));
328 unsigned nents = sg_count(areq->src, areq->cryptlen);
329 dma_addr_t iv_addr;
330 struct scatterlist *cur;
331 int i, dst_ents, src_ents, assoc_ents;
332 u8 *iv = giv ? giv : areq->iv;
333
334 src_ddt = dma_pool_alloc(engine->req_pool, GFP_ATOMIC, &req->src_addr);
335 if (!src_ddt)
336 return -ENOMEM;
337
338 dst_ddt = dma_pool_alloc(engine->req_pool, GFP_ATOMIC, &req->dst_addr);
339 if (!dst_ddt) {
340 dma_pool_free(engine->req_pool, src_ddt, req->src_addr);
341 return -ENOMEM;
342 }
343
344 req->src_ddt = src_ddt;
345 req->dst_ddt = dst_ddt;
346
347 assoc_ents = dma_map_sg(engine->dev, areq->assoc,
348 sg_count(areq->assoc, areq->assoclen), DMA_TO_DEVICE);
349 if (areq->src != areq->dst) {
350 src_ents = dma_map_sg(engine->dev, areq->src, nents,
351 DMA_TO_DEVICE);
352 dst_ents = dma_map_sg(engine->dev, areq->dst, nents,
353 DMA_FROM_DEVICE);
354 } else {
355 src_ents = dma_map_sg(engine->dev, areq->src, nents,
356 DMA_BIDIRECTIONAL);
357 dst_ents = 0;
358 }
359
360 /*
361 * Map the IV/GIV. For the GIV it needs to be bidirectional as it is
362 * formed by the crypto block and sent as the ESP IV for IPSEC.
363 */
364 iv_addr = dma_map_single(engine->dev, iv, ivsize,
365 giv ? DMA_BIDIRECTIONAL : DMA_TO_DEVICE);
366 req->giv_pa = iv_addr;
367
368 /*
369 * Map the associated data. For decryption we don't copy the
370 * associated data.
371 */
372 for_each_sg(areq->assoc, cur, assoc_ents, i) {
373 ddt_set(src_ddt++, sg_dma_address(cur), sg_dma_len(cur));
374 if (req->is_encrypt)
375 ddt_set(dst_ddt++, sg_dma_address(cur),
376 sg_dma_len(cur));
377 }
378 ddt_set(src_ddt++, iv_addr, ivsize);
379
380 if (giv || req->is_encrypt)
381 ddt_set(dst_ddt++, iv_addr, ivsize);
382
383 /*
384 * Now map in the payload for the source and destination and terminate
385 * with the NULL pointers.
386 */
387 for_each_sg(areq->src, cur, src_ents, i) {
388 ddt_set(src_ddt++, sg_dma_address(cur), sg_dma_len(cur));
389 if (areq->src == areq->dst)
390 ddt_set(dst_ddt++, sg_dma_address(cur),
391 sg_dma_len(cur));
392 }
393
394 for_each_sg(areq->dst, cur, dst_ents, i)
395 ddt_set(dst_ddt++, sg_dma_address(cur),
396 sg_dma_len(cur));
397
398 ddt_set(src_ddt, 0, 0);
399 ddt_set(dst_ddt, 0, 0);
400
401 return 0;
402 }
403
spacc_aead_free_ddts(struct spacc_req * req)404 static void spacc_aead_free_ddts(struct spacc_req *req)
405 {
406 struct aead_request *areq = container_of(req->req, struct aead_request,
407 base);
408 struct spacc_alg *alg = to_spacc_alg(req->req->tfm->__crt_alg);
409 struct spacc_ablk_ctx *aead_ctx = crypto_tfm_ctx(req->req->tfm);
410 struct spacc_engine *engine = aead_ctx->generic.engine;
411 unsigned ivsize = alg->alg.cra_aead.ivsize;
412 unsigned nents = sg_count(areq->src, areq->cryptlen);
413
414 if (areq->src != areq->dst) {
415 dma_unmap_sg(engine->dev, areq->src, nents, DMA_TO_DEVICE);
416 dma_unmap_sg(engine->dev, areq->dst,
417 sg_count(areq->dst, areq->cryptlen),
418 DMA_FROM_DEVICE);
419 } else
420 dma_unmap_sg(engine->dev, areq->src, nents, DMA_BIDIRECTIONAL);
421
422 dma_unmap_sg(engine->dev, areq->assoc,
423 sg_count(areq->assoc, areq->assoclen), DMA_TO_DEVICE);
424
425 dma_unmap_single(engine->dev, req->giv_pa, ivsize, DMA_BIDIRECTIONAL);
426
427 dma_pool_free(engine->req_pool, req->src_ddt, req->src_addr);
428 dma_pool_free(engine->req_pool, req->dst_ddt, req->dst_addr);
429 }
430
spacc_free_ddt(struct spacc_req * req,struct spacc_ddt * ddt,dma_addr_t ddt_addr,struct scatterlist * payload,unsigned nbytes,enum dma_data_direction dir)431 static void spacc_free_ddt(struct spacc_req *req, struct spacc_ddt *ddt,
432 dma_addr_t ddt_addr, struct scatterlist *payload,
433 unsigned nbytes, enum dma_data_direction dir)
434 {
435 unsigned nents = sg_count(payload, nbytes);
436
437 dma_unmap_sg(req->engine->dev, payload, nents, dir);
438 dma_pool_free(req->engine->req_pool, ddt, ddt_addr);
439 }
440
441 /*
442 * Set key for a DES operation in an AEAD cipher. This also performs weak key
443 * checking if required.
444 */
spacc_aead_des_setkey(struct crypto_aead * aead,const u8 * key,unsigned int len)445 static int spacc_aead_des_setkey(struct crypto_aead *aead, const u8 *key,
446 unsigned int len)
447 {
448 struct crypto_tfm *tfm = crypto_aead_tfm(aead);
449 struct spacc_aead_ctx *ctx = crypto_tfm_ctx(tfm);
450 u32 tmp[DES_EXPKEY_WORDS];
451
452 if (unlikely(!des_ekey(tmp, key)) &&
453 (crypto_aead_get_flags(aead)) & CRYPTO_TFM_REQ_WEAK_KEY) {
454 tfm->crt_flags |= CRYPTO_TFM_RES_WEAK_KEY;
455 return -EINVAL;
456 }
457
458 memcpy(ctx->cipher_key, key, len);
459 ctx->cipher_key_len = len;
460
461 return 0;
462 }
463
464 /* Set the key for the AES block cipher component of the AEAD transform. */
spacc_aead_aes_setkey(struct crypto_aead * aead,const u8 * key,unsigned int len)465 static int spacc_aead_aes_setkey(struct crypto_aead *aead, const u8 *key,
466 unsigned int len)
467 {
468 struct crypto_tfm *tfm = crypto_aead_tfm(aead);
469 struct spacc_aead_ctx *ctx = crypto_tfm_ctx(tfm);
470
471 /*
472 * IPSec engine only supports 128 and 256 bit AES keys. If we get a
473 * request for any other size (192 bits) then we need to do a software
474 * fallback.
475 */
476 if (len != AES_KEYSIZE_128 && len != AES_KEYSIZE_256) {
477 /*
478 * Set the fallback transform to use the same request flags as
479 * the hardware transform.
480 */
481 ctx->sw_cipher->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
482 ctx->sw_cipher->base.crt_flags |=
483 tfm->crt_flags & CRYPTO_TFM_REQ_MASK;
484 return crypto_aead_setkey(ctx->sw_cipher, key, len);
485 }
486
487 memcpy(ctx->cipher_key, key, len);
488 ctx->cipher_key_len = len;
489
490 return 0;
491 }
492
spacc_aead_setkey(struct crypto_aead * tfm,const u8 * key,unsigned int keylen)493 static int spacc_aead_setkey(struct crypto_aead *tfm, const u8 *key,
494 unsigned int keylen)
495 {
496 struct spacc_aead_ctx *ctx = crypto_aead_ctx(tfm);
497 struct spacc_alg *alg = to_spacc_alg(tfm->base.__crt_alg);
498 struct rtattr *rta = (void *)key;
499 struct crypto_authenc_key_param *param;
500 unsigned int authkeylen, enckeylen;
501 int err = -EINVAL;
502
503 if (!RTA_OK(rta, keylen))
504 goto badkey;
505
506 if (rta->rta_type != CRYPTO_AUTHENC_KEYA_PARAM)
507 goto badkey;
508
509 if (RTA_PAYLOAD(rta) < sizeof(*param))
510 goto badkey;
511
512 param = RTA_DATA(rta);
513 enckeylen = be32_to_cpu(param->enckeylen);
514
515 key += RTA_ALIGN(rta->rta_len);
516 keylen -= RTA_ALIGN(rta->rta_len);
517
518 if (keylen < enckeylen)
519 goto badkey;
520
521 authkeylen = keylen - enckeylen;
522
523 if (enckeylen > AES_MAX_KEY_SIZE)
524 goto badkey;
525
526 if ((alg->ctrl_default & SPACC_CRYPTO_ALG_MASK) ==
527 SPA_CTRL_CIPH_ALG_AES)
528 err = spacc_aead_aes_setkey(tfm, key + authkeylen, enckeylen);
529 else
530 err = spacc_aead_des_setkey(tfm, key + authkeylen, enckeylen);
531
532 if (err)
533 goto badkey;
534
535 memcpy(ctx->hash_ctx, key, authkeylen);
536 ctx->hash_key_len = authkeylen;
537
538 return 0;
539
540 badkey:
541 crypto_aead_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
542 return -EINVAL;
543 }
544
spacc_aead_setauthsize(struct crypto_aead * tfm,unsigned int authsize)545 static int spacc_aead_setauthsize(struct crypto_aead *tfm,
546 unsigned int authsize)
547 {
548 struct spacc_aead_ctx *ctx = crypto_tfm_ctx(crypto_aead_tfm(tfm));
549
550 ctx->auth_size = authsize;
551
552 return 0;
553 }
554
555 /*
556 * Check if an AEAD request requires a fallback operation. Some requests can't
557 * be completed in hardware because the hardware may not support certain key
558 * sizes. In these cases we need to complete the request in software.
559 */
spacc_aead_need_fallback(struct spacc_req * req)560 static int spacc_aead_need_fallback(struct spacc_req *req)
561 {
562 struct aead_request *aead_req;
563 struct crypto_tfm *tfm = req->req->tfm;
564 struct crypto_alg *alg = req->req->tfm->__crt_alg;
565 struct spacc_alg *spacc_alg = to_spacc_alg(alg);
566 struct spacc_aead_ctx *ctx = crypto_tfm_ctx(tfm);
567
568 aead_req = container_of(req->req, struct aead_request, base);
569 /*
570 * If we have a non-supported key-length, then we need to do a
571 * software fallback.
572 */
573 if ((spacc_alg->ctrl_default & SPACC_CRYPTO_ALG_MASK) ==
574 SPA_CTRL_CIPH_ALG_AES &&
575 ctx->cipher_key_len != AES_KEYSIZE_128 &&
576 ctx->cipher_key_len != AES_KEYSIZE_256)
577 return 1;
578
579 return 0;
580 }
581
spacc_aead_do_fallback(struct aead_request * req,unsigned alg_type,bool is_encrypt)582 static int spacc_aead_do_fallback(struct aead_request *req, unsigned alg_type,
583 bool is_encrypt)
584 {
585 struct crypto_tfm *old_tfm = crypto_aead_tfm(crypto_aead_reqtfm(req));
586 struct spacc_aead_ctx *ctx = crypto_tfm_ctx(old_tfm);
587 int err;
588
589 if (ctx->sw_cipher) {
590 /*
591 * Change the request to use the software fallback transform,
592 * and once the ciphering has completed, put the old transform
593 * back into the request.
594 */
595 aead_request_set_tfm(req, ctx->sw_cipher);
596 err = is_encrypt ? crypto_aead_encrypt(req) :
597 crypto_aead_decrypt(req);
598 aead_request_set_tfm(req, __crypto_aead_cast(old_tfm));
599 } else
600 err = -EINVAL;
601
602 return err;
603 }
604
spacc_aead_complete(struct spacc_req * req)605 static void spacc_aead_complete(struct spacc_req *req)
606 {
607 spacc_aead_free_ddts(req);
608 req->req->complete(req->req, req->result);
609 }
610
spacc_aead_submit(struct spacc_req * req)611 static int spacc_aead_submit(struct spacc_req *req)
612 {
613 struct crypto_tfm *tfm = req->req->tfm;
614 struct spacc_aead_ctx *ctx = crypto_tfm_ctx(tfm);
615 struct crypto_alg *alg = req->req->tfm->__crt_alg;
616 struct spacc_alg *spacc_alg = to_spacc_alg(alg);
617 struct spacc_engine *engine = ctx->generic.engine;
618 u32 ctrl, proc_len, assoc_len;
619 struct aead_request *aead_req =
620 container_of(req->req, struct aead_request, base);
621
622 req->result = -EINPROGRESS;
623 req->ctx_id = spacc_load_ctx(&ctx->generic, ctx->cipher_key,
624 ctx->cipher_key_len, aead_req->iv, alg->cra_aead.ivsize,
625 ctx->hash_ctx, ctx->hash_key_len);
626
627 /* Set the source and destination DDT pointers. */
628 writel(req->src_addr, engine->regs + SPA_SRC_PTR_REG_OFFSET);
629 writel(req->dst_addr, engine->regs + SPA_DST_PTR_REG_OFFSET);
630 writel(0, engine->regs + SPA_OFFSET_REG_OFFSET);
631
632 assoc_len = aead_req->assoclen;
633 proc_len = aead_req->cryptlen + assoc_len;
634
635 /*
636 * If we aren't generating an IV, then we need to include the IV in the
637 * associated data so that it is included in the hash.
638 */
639 if (!req->giv) {
640 assoc_len += crypto_aead_ivsize(crypto_aead_reqtfm(aead_req));
641 proc_len += crypto_aead_ivsize(crypto_aead_reqtfm(aead_req));
642 } else
643 proc_len += req->giv_len;
644
645 /*
646 * If we are decrypting, we need to take the length of the ICV out of
647 * the processing length.
648 */
649 if (!req->is_encrypt)
650 proc_len -= ctx->auth_size;
651
652 writel(proc_len, engine->regs + SPA_PROC_LEN_REG_OFFSET);
653 writel(assoc_len, engine->regs + SPA_AAD_LEN_REG_OFFSET);
654 writel(ctx->auth_size, engine->regs + SPA_ICV_LEN_REG_OFFSET);
655 writel(0, engine->regs + SPA_ICV_OFFSET_REG_OFFSET);
656 writel(0, engine->regs + SPA_AUX_INFO_REG_OFFSET);
657
658 ctrl = spacc_alg->ctrl_default | (req->ctx_id << SPA_CTRL_CTX_IDX) |
659 (1 << SPA_CTRL_ICV_APPEND);
660 if (req->is_encrypt)
661 ctrl |= (1 << SPA_CTRL_ENCRYPT_IDX) | (1 << SPA_CTRL_AAD_COPY);
662 else
663 ctrl |= (1 << SPA_CTRL_KEY_EXP);
664
665 mod_timer(&engine->packet_timeout, jiffies + PACKET_TIMEOUT);
666
667 writel(ctrl, engine->regs + SPA_CTRL_REG_OFFSET);
668
669 return -EINPROGRESS;
670 }
671
672 static int spacc_req_submit(struct spacc_req *req);
673
spacc_push(struct spacc_engine * engine)674 static void spacc_push(struct spacc_engine *engine)
675 {
676 struct spacc_req *req;
677
678 while (!list_empty(&engine->pending) &&
679 engine->in_flight + 1 <= engine->fifo_sz) {
680
681 ++engine->in_flight;
682 req = list_first_entry(&engine->pending, struct spacc_req,
683 list);
684 list_move_tail(&req->list, &engine->in_progress);
685
686 req->result = spacc_req_submit(req);
687 }
688 }
689
690 /*
691 * Setup an AEAD request for processing. This will configure the engine, load
692 * the context and then start the packet processing.
693 *
694 * @giv Pointer to destination address for a generated IV. If the
695 * request does not need to generate an IV then this should be set to NULL.
696 */
spacc_aead_setup(struct aead_request * req,u8 * giv,unsigned alg_type,bool is_encrypt)697 static int spacc_aead_setup(struct aead_request *req, u8 *giv,
698 unsigned alg_type, bool is_encrypt)
699 {
700 struct crypto_alg *alg = req->base.tfm->__crt_alg;
701 struct spacc_engine *engine = to_spacc_alg(alg)->engine;
702 struct spacc_req *dev_req = aead_request_ctx(req);
703 int err = -EINPROGRESS;
704 unsigned long flags;
705 unsigned ivsize = crypto_aead_ivsize(crypto_aead_reqtfm(req));
706
707 dev_req->giv = giv;
708 dev_req->giv_len = ivsize;
709 dev_req->req = &req->base;
710 dev_req->is_encrypt = is_encrypt;
711 dev_req->result = -EBUSY;
712 dev_req->engine = engine;
713 dev_req->complete = spacc_aead_complete;
714
715 if (unlikely(spacc_aead_need_fallback(dev_req)))
716 return spacc_aead_do_fallback(req, alg_type, is_encrypt);
717
718 spacc_aead_make_ddts(dev_req, dev_req->giv);
719
720 err = -EINPROGRESS;
721 spin_lock_irqsave(&engine->hw_lock, flags);
722 if (unlikely(spacc_fifo_cmd_full(engine)) ||
723 engine->in_flight + 1 > engine->fifo_sz) {
724 if (!(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
725 err = -EBUSY;
726 spin_unlock_irqrestore(&engine->hw_lock, flags);
727 goto out_free_ddts;
728 }
729 list_add_tail(&dev_req->list, &engine->pending);
730 } else {
731 list_add_tail(&dev_req->list, &engine->pending);
732 spacc_push(engine);
733 }
734 spin_unlock_irqrestore(&engine->hw_lock, flags);
735
736 goto out;
737
738 out_free_ddts:
739 spacc_aead_free_ddts(dev_req);
740 out:
741 return err;
742 }
743
spacc_aead_encrypt(struct aead_request * req)744 static int spacc_aead_encrypt(struct aead_request *req)
745 {
746 struct crypto_aead *aead = crypto_aead_reqtfm(req);
747 struct crypto_tfm *tfm = crypto_aead_tfm(aead);
748 struct spacc_alg *alg = to_spacc_alg(tfm->__crt_alg);
749
750 return spacc_aead_setup(req, NULL, alg->type, 1);
751 }
752
spacc_aead_givencrypt(struct aead_givcrypt_request * req)753 static int spacc_aead_givencrypt(struct aead_givcrypt_request *req)
754 {
755 struct crypto_aead *tfm = aead_givcrypt_reqtfm(req);
756 struct spacc_aead_ctx *ctx = crypto_aead_ctx(tfm);
757 size_t ivsize = crypto_aead_ivsize(tfm);
758 struct spacc_alg *alg = to_spacc_alg(tfm->base.__crt_alg);
759 unsigned len;
760 __be64 seq;
761
762 memcpy(req->areq.iv, ctx->salt, ivsize);
763 len = ivsize;
764 if (ivsize > sizeof(u64)) {
765 memset(req->giv, 0, ivsize - sizeof(u64));
766 len = sizeof(u64);
767 }
768 seq = cpu_to_be64(req->seq);
769 memcpy(req->giv + ivsize - len, &seq, len);
770
771 return spacc_aead_setup(&req->areq, req->giv, alg->type, 1);
772 }
773
spacc_aead_decrypt(struct aead_request * req)774 static int spacc_aead_decrypt(struct aead_request *req)
775 {
776 struct crypto_aead *aead = crypto_aead_reqtfm(req);
777 struct crypto_tfm *tfm = crypto_aead_tfm(aead);
778 struct spacc_alg *alg = to_spacc_alg(tfm->__crt_alg);
779
780 return spacc_aead_setup(req, NULL, alg->type, 0);
781 }
782
783 /*
784 * Initialise a new AEAD context. This is responsible for allocating the
785 * fallback cipher and initialising the context.
786 */
spacc_aead_cra_init(struct crypto_tfm * tfm)787 static int spacc_aead_cra_init(struct crypto_tfm *tfm)
788 {
789 struct spacc_aead_ctx *ctx = crypto_tfm_ctx(tfm);
790 struct crypto_alg *alg = tfm->__crt_alg;
791 struct spacc_alg *spacc_alg = to_spacc_alg(alg);
792 struct spacc_engine *engine = spacc_alg->engine;
793
794 ctx->generic.flags = spacc_alg->type;
795 ctx->generic.engine = engine;
796 ctx->sw_cipher = crypto_alloc_aead(alg->cra_name, 0,
797 CRYPTO_ALG_ASYNC |
798 CRYPTO_ALG_NEED_FALLBACK);
799 if (IS_ERR(ctx->sw_cipher)) {
800 dev_warn(engine->dev, "failed to allocate fallback for %s\n",
801 alg->cra_name);
802 ctx->sw_cipher = NULL;
803 }
804 ctx->generic.key_offs = spacc_alg->key_offs;
805 ctx->generic.iv_offs = spacc_alg->iv_offs;
806
807 get_random_bytes(ctx->salt, sizeof(ctx->salt));
808
809 tfm->crt_aead.reqsize = sizeof(struct spacc_req);
810
811 return 0;
812 }
813
814 /*
815 * Destructor for an AEAD context. This is called when the transform is freed
816 * and must free the fallback cipher.
817 */
spacc_aead_cra_exit(struct crypto_tfm * tfm)818 static void spacc_aead_cra_exit(struct crypto_tfm *tfm)
819 {
820 struct spacc_aead_ctx *ctx = crypto_tfm_ctx(tfm);
821
822 if (ctx->sw_cipher)
823 crypto_free_aead(ctx->sw_cipher);
824 ctx->sw_cipher = NULL;
825 }
826
827 /*
828 * Set the DES key for a block cipher transform. This also performs weak key
829 * checking if the transform has requested it.
830 */
spacc_des_setkey(struct crypto_ablkcipher * cipher,const u8 * key,unsigned int len)831 static int spacc_des_setkey(struct crypto_ablkcipher *cipher, const u8 *key,
832 unsigned int len)
833 {
834 struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
835 struct spacc_ablk_ctx *ctx = crypto_tfm_ctx(tfm);
836 u32 tmp[DES_EXPKEY_WORDS];
837
838 if (len > DES3_EDE_KEY_SIZE) {
839 crypto_ablkcipher_set_flags(cipher, CRYPTO_TFM_RES_BAD_KEY_LEN);
840 return -EINVAL;
841 }
842
843 if (unlikely(!des_ekey(tmp, key)) &&
844 (crypto_ablkcipher_get_flags(cipher) & CRYPTO_TFM_REQ_WEAK_KEY)) {
845 tfm->crt_flags |= CRYPTO_TFM_RES_WEAK_KEY;
846 return -EINVAL;
847 }
848
849 memcpy(ctx->key, key, len);
850 ctx->key_len = len;
851
852 return 0;
853 }
854
855 /*
856 * Set the key for an AES block cipher. Some key lengths are not supported in
857 * hardware so this must also check whether a fallback is needed.
858 */
spacc_aes_setkey(struct crypto_ablkcipher * cipher,const u8 * key,unsigned int len)859 static int spacc_aes_setkey(struct crypto_ablkcipher *cipher, const u8 *key,
860 unsigned int len)
861 {
862 struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
863 struct spacc_ablk_ctx *ctx = crypto_tfm_ctx(tfm);
864 int err = 0;
865
866 if (len > AES_MAX_KEY_SIZE) {
867 crypto_ablkcipher_set_flags(cipher, CRYPTO_TFM_RES_BAD_KEY_LEN);
868 return -EINVAL;
869 }
870
871 /*
872 * IPSec engine only supports 128 and 256 bit AES keys. If we get a
873 * request for any other size (192 bits) then we need to do a software
874 * fallback.
875 */
876 if (len != AES_KEYSIZE_128 && len != AES_KEYSIZE_256 &&
877 ctx->sw_cipher) {
878 /*
879 * Set the fallback transform to use the same request flags as
880 * the hardware transform.
881 */
882 ctx->sw_cipher->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
883 ctx->sw_cipher->base.crt_flags |=
884 cipher->base.crt_flags & CRYPTO_TFM_REQ_MASK;
885
886 err = crypto_ablkcipher_setkey(ctx->sw_cipher, key, len);
887 if (err)
888 goto sw_setkey_failed;
889 } else if (len != AES_KEYSIZE_128 && len != AES_KEYSIZE_256 &&
890 !ctx->sw_cipher)
891 err = -EINVAL;
892
893 memcpy(ctx->key, key, len);
894 ctx->key_len = len;
895
896 sw_setkey_failed:
897 if (err && ctx->sw_cipher) {
898 tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
899 tfm->crt_flags |=
900 ctx->sw_cipher->base.crt_flags & CRYPTO_TFM_RES_MASK;
901 }
902
903 return err;
904 }
905
spacc_kasumi_f8_setkey(struct crypto_ablkcipher * cipher,const u8 * key,unsigned int len)906 static int spacc_kasumi_f8_setkey(struct crypto_ablkcipher *cipher,
907 const u8 *key, unsigned int len)
908 {
909 struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
910 struct spacc_ablk_ctx *ctx = crypto_tfm_ctx(tfm);
911 int err = 0;
912
913 if (len > AES_MAX_KEY_SIZE) {
914 crypto_ablkcipher_set_flags(cipher, CRYPTO_TFM_RES_BAD_KEY_LEN);
915 err = -EINVAL;
916 goto out;
917 }
918
919 memcpy(ctx->key, key, len);
920 ctx->key_len = len;
921
922 out:
923 return err;
924 }
925
spacc_ablk_need_fallback(struct spacc_req * req)926 static int spacc_ablk_need_fallback(struct spacc_req *req)
927 {
928 struct spacc_ablk_ctx *ctx;
929 struct crypto_tfm *tfm = req->req->tfm;
930 struct crypto_alg *alg = req->req->tfm->__crt_alg;
931 struct spacc_alg *spacc_alg = to_spacc_alg(alg);
932
933 ctx = crypto_tfm_ctx(tfm);
934
935 return (spacc_alg->ctrl_default & SPACC_CRYPTO_ALG_MASK) ==
936 SPA_CTRL_CIPH_ALG_AES &&
937 ctx->key_len != AES_KEYSIZE_128 &&
938 ctx->key_len != AES_KEYSIZE_256;
939 }
940
spacc_ablk_complete(struct spacc_req * req)941 static void spacc_ablk_complete(struct spacc_req *req)
942 {
943 struct ablkcipher_request *ablk_req =
944 container_of(req->req, struct ablkcipher_request, base);
945
946 if (ablk_req->src != ablk_req->dst) {
947 spacc_free_ddt(req, req->src_ddt, req->src_addr, ablk_req->src,
948 ablk_req->nbytes, DMA_TO_DEVICE);
949 spacc_free_ddt(req, req->dst_ddt, req->dst_addr, ablk_req->dst,
950 ablk_req->nbytes, DMA_FROM_DEVICE);
951 } else
952 spacc_free_ddt(req, req->dst_ddt, req->dst_addr, ablk_req->dst,
953 ablk_req->nbytes, DMA_BIDIRECTIONAL);
954
955 req->req->complete(req->req, req->result);
956 }
957
spacc_ablk_submit(struct spacc_req * req)958 static int spacc_ablk_submit(struct spacc_req *req)
959 {
960 struct crypto_tfm *tfm = req->req->tfm;
961 struct spacc_ablk_ctx *ctx = crypto_tfm_ctx(tfm);
962 struct ablkcipher_request *ablk_req = ablkcipher_request_cast(req->req);
963 struct crypto_alg *alg = req->req->tfm->__crt_alg;
964 struct spacc_alg *spacc_alg = to_spacc_alg(alg);
965 struct spacc_engine *engine = ctx->generic.engine;
966 u32 ctrl;
967
968 req->ctx_id = spacc_load_ctx(&ctx->generic, ctx->key,
969 ctx->key_len, ablk_req->info, alg->cra_ablkcipher.ivsize,
970 NULL, 0);
971
972 writel(req->src_addr, engine->regs + SPA_SRC_PTR_REG_OFFSET);
973 writel(req->dst_addr, engine->regs + SPA_DST_PTR_REG_OFFSET);
974 writel(0, engine->regs + SPA_OFFSET_REG_OFFSET);
975
976 writel(ablk_req->nbytes, engine->regs + SPA_PROC_LEN_REG_OFFSET);
977 writel(0, engine->regs + SPA_ICV_OFFSET_REG_OFFSET);
978 writel(0, engine->regs + SPA_AUX_INFO_REG_OFFSET);
979 writel(0, engine->regs + SPA_AAD_LEN_REG_OFFSET);
980
981 ctrl = spacc_alg->ctrl_default | (req->ctx_id << SPA_CTRL_CTX_IDX) |
982 (req->is_encrypt ? (1 << SPA_CTRL_ENCRYPT_IDX) :
983 (1 << SPA_CTRL_KEY_EXP));
984
985 mod_timer(&engine->packet_timeout, jiffies + PACKET_TIMEOUT);
986
987 writel(ctrl, engine->regs + SPA_CTRL_REG_OFFSET);
988
989 return -EINPROGRESS;
990 }
991
spacc_ablk_do_fallback(struct ablkcipher_request * req,unsigned alg_type,bool is_encrypt)992 static int spacc_ablk_do_fallback(struct ablkcipher_request *req,
993 unsigned alg_type, bool is_encrypt)
994 {
995 struct crypto_tfm *old_tfm =
996 crypto_ablkcipher_tfm(crypto_ablkcipher_reqtfm(req));
997 struct spacc_ablk_ctx *ctx = crypto_tfm_ctx(old_tfm);
998 int err;
999
1000 if (!ctx->sw_cipher)
1001 return -EINVAL;
1002
1003 /*
1004 * Change the request to use the software fallback transform, and once
1005 * the ciphering has completed, put the old transform back into the
1006 * request.
1007 */
1008 ablkcipher_request_set_tfm(req, ctx->sw_cipher);
1009 err = is_encrypt ? crypto_ablkcipher_encrypt(req) :
1010 crypto_ablkcipher_decrypt(req);
1011 ablkcipher_request_set_tfm(req, __crypto_ablkcipher_cast(old_tfm));
1012
1013 return err;
1014 }
1015
spacc_ablk_setup(struct ablkcipher_request * req,unsigned alg_type,bool is_encrypt)1016 static int spacc_ablk_setup(struct ablkcipher_request *req, unsigned alg_type,
1017 bool is_encrypt)
1018 {
1019 struct crypto_alg *alg = req->base.tfm->__crt_alg;
1020 struct spacc_engine *engine = to_spacc_alg(alg)->engine;
1021 struct spacc_req *dev_req = ablkcipher_request_ctx(req);
1022 unsigned long flags;
1023 int err = -ENOMEM;
1024
1025 dev_req->req = &req->base;
1026 dev_req->is_encrypt = is_encrypt;
1027 dev_req->engine = engine;
1028 dev_req->complete = spacc_ablk_complete;
1029 dev_req->result = -EINPROGRESS;
1030
1031 if (unlikely(spacc_ablk_need_fallback(dev_req)))
1032 return spacc_ablk_do_fallback(req, alg_type, is_encrypt);
1033
1034 /*
1035 * Create the DDT's for the engine. If we share the same source and
1036 * destination then we can optimize by reusing the DDT's.
1037 */
1038 if (req->src != req->dst) {
1039 dev_req->src_ddt = spacc_sg_to_ddt(engine, req->src,
1040 req->nbytes, DMA_TO_DEVICE, &dev_req->src_addr);
1041 if (!dev_req->src_ddt)
1042 goto out;
1043
1044 dev_req->dst_ddt = spacc_sg_to_ddt(engine, req->dst,
1045 req->nbytes, DMA_FROM_DEVICE, &dev_req->dst_addr);
1046 if (!dev_req->dst_ddt)
1047 goto out_free_src;
1048 } else {
1049 dev_req->dst_ddt = spacc_sg_to_ddt(engine, req->dst,
1050 req->nbytes, DMA_BIDIRECTIONAL, &dev_req->dst_addr);
1051 if (!dev_req->dst_ddt)
1052 goto out;
1053
1054 dev_req->src_ddt = NULL;
1055 dev_req->src_addr = dev_req->dst_addr;
1056 }
1057
1058 err = -EINPROGRESS;
1059 spin_lock_irqsave(&engine->hw_lock, flags);
1060 /*
1061 * Check if the engine will accept the operation now. If it won't then
1062 * we either stick it on the end of a pending list if we can backlog,
1063 * or bailout with an error if not.
1064 */
1065 if (unlikely(spacc_fifo_cmd_full(engine)) ||
1066 engine->in_flight + 1 > engine->fifo_sz) {
1067 if (!(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
1068 err = -EBUSY;
1069 spin_unlock_irqrestore(&engine->hw_lock, flags);
1070 goto out_free_ddts;
1071 }
1072 list_add_tail(&dev_req->list, &engine->pending);
1073 } else {
1074 list_add_tail(&dev_req->list, &engine->pending);
1075 spacc_push(engine);
1076 }
1077 spin_unlock_irqrestore(&engine->hw_lock, flags);
1078
1079 goto out;
1080
1081 out_free_ddts:
1082 spacc_free_ddt(dev_req, dev_req->dst_ddt, dev_req->dst_addr, req->dst,
1083 req->nbytes, req->src == req->dst ?
1084 DMA_BIDIRECTIONAL : DMA_FROM_DEVICE);
1085 out_free_src:
1086 if (req->src != req->dst)
1087 spacc_free_ddt(dev_req, dev_req->src_ddt, dev_req->src_addr,
1088 req->src, req->nbytes, DMA_TO_DEVICE);
1089 out:
1090 return err;
1091 }
1092
spacc_ablk_cra_init(struct crypto_tfm * tfm)1093 static int spacc_ablk_cra_init(struct crypto_tfm *tfm)
1094 {
1095 struct spacc_ablk_ctx *ctx = crypto_tfm_ctx(tfm);
1096 struct crypto_alg *alg = tfm->__crt_alg;
1097 struct spacc_alg *spacc_alg = to_spacc_alg(alg);
1098 struct spacc_engine *engine = spacc_alg->engine;
1099
1100 ctx->generic.flags = spacc_alg->type;
1101 ctx->generic.engine = engine;
1102 if (alg->cra_flags & CRYPTO_ALG_NEED_FALLBACK) {
1103 ctx->sw_cipher = crypto_alloc_ablkcipher(alg->cra_name, 0,
1104 CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);
1105 if (IS_ERR(ctx->sw_cipher)) {
1106 dev_warn(engine->dev, "failed to allocate fallback for %s\n",
1107 alg->cra_name);
1108 ctx->sw_cipher = NULL;
1109 }
1110 }
1111 ctx->generic.key_offs = spacc_alg->key_offs;
1112 ctx->generic.iv_offs = spacc_alg->iv_offs;
1113
1114 tfm->crt_ablkcipher.reqsize = sizeof(struct spacc_req);
1115
1116 return 0;
1117 }
1118
spacc_ablk_cra_exit(struct crypto_tfm * tfm)1119 static void spacc_ablk_cra_exit(struct crypto_tfm *tfm)
1120 {
1121 struct spacc_ablk_ctx *ctx = crypto_tfm_ctx(tfm);
1122
1123 if (ctx->sw_cipher)
1124 crypto_free_ablkcipher(ctx->sw_cipher);
1125 ctx->sw_cipher = NULL;
1126 }
1127
spacc_ablk_encrypt(struct ablkcipher_request * req)1128 static int spacc_ablk_encrypt(struct ablkcipher_request *req)
1129 {
1130 struct crypto_ablkcipher *cipher = crypto_ablkcipher_reqtfm(req);
1131 struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
1132 struct spacc_alg *alg = to_spacc_alg(tfm->__crt_alg);
1133
1134 return spacc_ablk_setup(req, alg->type, 1);
1135 }
1136
spacc_ablk_decrypt(struct ablkcipher_request * req)1137 static int spacc_ablk_decrypt(struct ablkcipher_request *req)
1138 {
1139 struct crypto_ablkcipher *cipher = crypto_ablkcipher_reqtfm(req);
1140 struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
1141 struct spacc_alg *alg = to_spacc_alg(tfm->__crt_alg);
1142
1143 return spacc_ablk_setup(req, alg->type, 0);
1144 }
1145
spacc_fifo_stat_empty(struct spacc_engine * engine)1146 static inline int spacc_fifo_stat_empty(struct spacc_engine *engine)
1147 {
1148 return readl(engine->regs + SPA_FIFO_STAT_REG_OFFSET) &
1149 SPA_FIFO_STAT_EMPTY;
1150 }
1151
spacc_process_done(struct spacc_engine * engine)1152 static void spacc_process_done(struct spacc_engine *engine)
1153 {
1154 struct spacc_req *req;
1155 unsigned long flags;
1156
1157 spin_lock_irqsave(&engine->hw_lock, flags);
1158
1159 while (!spacc_fifo_stat_empty(engine)) {
1160 req = list_first_entry(&engine->in_progress, struct spacc_req,
1161 list);
1162 list_move_tail(&req->list, &engine->completed);
1163 --engine->in_flight;
1164
1165 /* POP the status register. */
1166 writel(~0, engine->regs + SPA_STAT_POP_REG_OFFSET);
1167 req->result = (readl(engine->regs + SPA_STATUS_REG_OFFSET) &
1168 SPA_STATUS_RES_CODE_MASK) >> SPA_STATUS_RES_CODE_OFFSET;
1169
1170 /*
1171 * Convert the SPAcc error status into the standard POSIX error
1172 * codes.
1173 */
1174 if (unlikely(req->result)) {
1175 switch (req->result) {
1176 case SPA_STATUS_ICV_FAIL:
1177 req->result = -EBADMSG;
1178 break;
1179
1180 case SPA_STATUS_MEMORY_ERROR:
1181 dev_warn(engine->dev,
1182 "memory error triggered\n");
1183 req->result = -EFAULT;
1184 break;
1185
1186 case SPA_STATUS_BLOCK_ERROR:
1187 dev_warn(engine->dev,
1188 "block error triggered\n");
1189 req->result = -EIO;
1190 break;
1191 }
1192 }
1193 }
1194
1195 tasklet_schedule(&engine->complete);
1196
1197 spin_unlock_irqrestore(&engine->hw_lock, flags);
1198 }
1199
spacc_spacc_irq(int irq,void * dev)1200 static irqreturn_t spacc_spacc_irq(int irq, void *dev)
1201 {
1202 struct spacc_engine *engine = (struct spacc_engine *)dev;
1203 u32 spacc_irq_stat = readl(engine->regs + SPA_IRQ_STAT_REG_OFFSET);
1204
1205 writel(spacc_irq_stat, engine->regs + SPA_IRQ_STAT_REG_OFFSET);
1206 spacc_process_done(engine);
1207
1208 return IRQ_HANDLED;
1209 }
1210
spacc_packet_timeout(unsigned long data)1211 static void spacc_packet_timeout(unsigned long data)
1212 {
1213 struct spacc_engine *engine = (struct spacc_engine *)data;
1214
1215 spacc_process_done(engine);
1216 }
1217
spacc_req_submit(struct spacc_req * req)1218 static int spacc_req_submit(struct spacc_req *req)
1219 {
1220 struct crypto_alg *alg = req->req->tfm->__crt_alg;
1221
1222 if (CRYPTO_ALG_TYPE_AEAD == (CRYPTO_ALG_TYPE_MASK & alg->cra_flags))
1223 return spacc_aead_submit(req);
1224 else
1225 return spacc_ablk_submit(req);
1226 }
1227
spacc_spacc_complete(unsigned long data)1228 static void spacc_spacc_complete(unsigned long data)
1229 {
1230 struct spacc_engine *engine = (struct spacc_engine *)data;
1231 struct spacc_req *req, *tmp;
1232 unsigned long flags;
1233 LIST_HEAD(completed);
1234
1235 spin_lock_irqsave(&engine->hw_lock, flags);
1236
1237 list_splice_init(&engine->completed, &completed);
1238 spacc_push(engine);
1239 if (engine->in_flight)
1240 mod_timer(&engine->packet_timeout, jiffies + PACKET_TIMEOUT);
1241
1242 spin_unlock_irqrestore(&engine->hw_lock, flags);
1243
1244 list_for_each_entry_safe(req, tmp, &completed, list) {
1245 list_del(&req->list);
1246 req->complete(req);
1247 }
1248 }
1249
1250 #ifdef CONFIG_PM
spacc_suspend(struct device * dev)1251 static int spacc_suspend(struct device *dev)
1252 {
1253 struct platform_device *pdev = to_platform_device(dev);
1254 struct spacc_engine *engine = platform_get_drvdata(pdev);
1255
1256 /*
1257 * We only support standby mode. All we have to do is gate the clock to
1258 * the spacc. The hardware will preserve state until we turn it back
1259 * on again.
1260 */
1261 clk_disable(engine->clk);
1262
1263 return 0;
1264 }
1265
spacc_resume(struct device * dev)1266 static int spacc_resume(struct device *dev)
1267 {
1268 struct platform_device *pdev = to_platform_device(dev);
1269 struct spacc_engine *engine = platform_get_drvdata(pdev);
1270
1271 return clk_enable(engine->clk);
1272 }
1273
1274 static const struct dev_pm_ops spacc_pm_ops = {
1275 .suspend = spacc_suspend,
1276 .resume = spacc_resume,
1277 };
1278 #endif /* CONFIG_PM */
1279
spacc_dev_to_engine(struct device * dev)1280 static inline struct spacc_engine *spacc_dev_to_engine(struct device *dev)
1281 {
1282 return dev ? platform_get_drvdata(to_platform_device(dev)) : NULL;
1283 }
1284
spacc_stat_irq_thresh_show(struct device * dev,struct device_attribute * attr,char * buf)1285 static ssize_t spacc_stat_irq_thresh_show(struct device *dev,
1286 struct device_attribute *attr,
1287 char *buf)
1288 {
1289 struct spacc_engine *engine = spacc_dev_to_engine(dev);
1290
1291 return snprintf(buf, PAGE_SIZE, "%u\n", engine->stat_irq_thresh);
1292 }
1293
spacc_stat_irq_thresh_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t len)1294 static ssize_t spacc_stat_irq_thresh_store(struct device *dev,
1295 struct device_attribute *attr,
1296 const char *buf, size_t len)
1297 {
1298 struct spacc_engine *engine = spacc_dev_to_engine(dev);
1299 unsigned long thresh;
1300
1301 if (strict_strtoul(buf, 0, &thresh))
1302 return -EINVAL;
1303
1304 thresh = clamp(thresh, 1UL, engine->fifo_sz - 1);
1305
1306 engine->stat_irq_thresh = thresh;
1307 writel(engine->stat_irq_thresh << SPA_IRQ_CTRL_STAT_CNT_OFFSET,
1308 engine->regs + SPA_IRQ_CTRL_REG_OFFSET);
1309
1310 return len;
1311 }
1312 static DEVICE_ATTR(stat_irq_thresh, 0644, spacc_stat_irq_thresh_show,
1313 spacc_stat_irq_thresh_store);
1314
1315 static struct spacc_alg ipsec_engine_algs[] = {
1316 {
1317 .ctrl_default = SPA_CTRL_CIPH_ALG_AES | SPA_CTRL_CIPH_MODE_CBC,
1318 .key_offs = 0,
1319 .iv_offs = AES_MAX_KEY_SIZE,
1320 .alg = {
1321 .cra_name = "cbc(aes)",
1322 .cra_driver_name = "cbc-aes-picoxcell",
1323 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1324 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
1325 CRYPTO_ALG_ASYNC |
1326 CRYPTO_ALG_NEED_FALLBACK,
1327 .cra_blocksize = AES_BLOCK_SIZE,
1328 .cra_ctxsize = sizeof(struct spacc_ablk_ctx),
1329 .cra_type = &crypto_ablkcipher_type,
1330 .cra_module = THIS_MODULE,
1331 .cra_ablkcipher = {
1332 .setkey = spacc_aes_setkey,
1333 .encrypt = spacc_ablk_encrypt,
1334 .decrypt = spacc_ablk_decrypt,
1335 .min_keysize = AES_MIN_KEY_SIZE,
1336 .max_keysize = AES_MAX_KEY_SIZE,
1337 .ivsize = AES_BLOCK_SIZE,
1338 },
1339 .cra_init = spacc_ablk_cra_init,
1340 .cra_exit = spacc_ablk_cra_exit,
1341 },
1342 },
1343 {
1344 .key_offs = 0,
1345 .iv_offs = AES_MAX_KEY_SIZE,
1346 .ctrl_default = SPA_CTRL_CIPH_ALG_AES | SPA_CTRL_CIPH_MODE_ECB,
1347 .alg = {
1348 .cra_name = "ecb(aes)",
1349 .cra_driver_name = "ecb-aes-picoxcell",
1350 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1351 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
1352 CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK,
1353 .cra_blocksize = AES_BLOCK_SIZE,
1354 .cra_ctxsize = sizeof(struct spacc_ablk_ctx),
1355 .cra_type = &crypto_ablkcipher_type,
1356 .cra_module = THIS_MODULE,
1357 .cra_ablkcipher = {
1358 .setkey = spacc_aes_setkey,
1359 .encrypt = spacc_ablk_encrypt,
1360 .decrypt = spacc_ablk_decrypt,
1361 .min_keysize = AES_MIN_KEY_SIZE,
1362 .max_keysize = AES_MAX_KEY_SIZE,
1363 },
1364 .cra_init = spacc_ablk_cra_init,
1365 .cra_exit = spacc_ablk_cra_exit,
1366 },
1367 },
1368 {
1369 .key_offs = DES_BLOCK_SIZE,
1370 .iv_offs = 0,
1371 .ctrl_default = SPA_CTRL_CIPH_ALG_DES | SPA_CTRL_CIPH_MODE_CBC,
1372 .alg = {
1373 .cra_name = "cbc(des)",
1374 .cra_driver_name = "cbc-des-picoxcell",
1375 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1376 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1377 .cra_blocksize = DES_BLOCK_SIZE,
1378 .cra_ctxsize = sizeof(struct spacc_ablk_ctx),
1379 .cra_type = &crypto_ablkcipher_type,
1380 .cra_module = THIS_MODULE,
1381 .cra_ablkcipher = {
1382 .setkey = spacc_des_setkey,
1383 .encrypt = spacc_ablk_encrypt,
1384 .decrypt = spacc_ablk_decrypt,
1385 .min_keysize = DES_KEY_SIZE,
1386 .max_keysize = DES_KEY_SIZE,
1387 .ivsize = DES_BLOCK_SIZE,
1388 },
1389 .cra_init = spacc_ablk_cra_init,
1390 .cra_exit = spacc_ablk_cra_exit,
1391 },
1392 },
1393 {
1394 .key_offs = DES_BLOCK_SIZE,
1395 .iv_offs = 0,
1396 .ctrl_default = SPA_CTRL_CIPH_ALG_DES | SPA_CTRL_CIPH_MODE_ECB,
1397 .alg = {
1398 .cra_name = "ecb(des)",
1399 .cra_driver_name = "ecb-des-picoxcell",
1400 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1401 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1402 .cra_blocksize = DES_BLOCK_SIZE,
1403 .cra_ctxsize = sizeof(struct spacc_ablk_ctx),
1404 .cra_type = &crypto_ablkcipher_type,
1405 .cra_module = THIS_MODULE,
1406 .cra_ablkcipher = {
1407 .setkey = spacc_des_setkey,
1408 .encrypt = spacc_ablk_encrypt,
1409 .decrypt = spacc_ablk_decrypt,
1410 .min_keysize = DES_KEY_SIZE,
1411 .max_keysize = DES_KEY_SIZE,
1412 },
1413 .cra_init = spacc_ablk_cra_init,
1414 .cra_exit = spacc_ablk_cra_exit,
1415 },
1416 },
1417 {
1418 .key_offs = DES_BLOCK_SIZE,
1419 .iv_offs = 0,
1420 .ctrl_default = SPA_CTRL_CIPH_ALG_DES | SPA_CTRL_CIPH_MODE_CBC,
1421 .alg = {
1422 .cra_name = "cbc(des3_ede)",
1423 .cra_driver_name = "cbc-des3-ede-picoxcell",
1424 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1425 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1426 .cra_blocksize = DES3_EDE_BLOCK_SIZE,
1427 .cra_ctxsize = sizeof(struct spacc_ablk_ctx),
1428 .cra_type = &crypto_ablkcipher_type,
1429 .cra_module = THIS_MODULE,
1430 .cra_ablkcipher = {
1431 .setkey = spacc_des_setkey,
1432 .encrypt = spacc_ablk_encrypt,
1433 .decrypt = spacc_ablk_decrypt,
1434 .min_keysize = DES3_EDE_KEY_SIZE,
1435 .max_keysize = DES3_EDE_KEY_SIZE,
1436 .ivsize = DES3_EDE_BLOCK_SIZE,
1437 },
1438 .cra_init = spacc_ablk_cra_init,
1439 .cra_exit = spacc_ablk_cra_exit,
1440 },
1441 },
1442 {
1443 .key_offs = DES_BLOCK_SIZE,
1444 .iv_offs = 0,
1445 .ctrl_default = SPA_CTRL_CIPH_ALG_DES | SPA_CTRL_CIPH_MODE_ECB,
1446 .alg = {
1447 .cra_name = "ecb(des3_ede)",
1448 .cra_driver_name = "ecb-des3-ede-picoxcell",
1449 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1450 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1451 .cra_blocksize = DES3_EDE_BLOCK_SIZE,
1452 .cra_ctxsize = sizeof(struct spacc_ablk_ctx),
1453 .cra_type = &crypto_ablkcipher_type,
1454 .cra_module = THIS_MODULE,
1455 .cra_ablkcipher = {
1456 .setkey = spacc_des_setkey,
1457 .encrypt = spacc_ablk_encrypt,
1458 .decrypt = spacc_ablk_decrypt,
1459 .min_keysize = DES3_EDE_KEY_SIZE,
1460 .max_keysize = DES3_EDE_KEY_SIZE,
1461 },
1462 .cra_init = spacc_ablk_cra_init,
1463 .cra_exit = spacc_ablk_cra_exit,
1464 },
1465 },
1466 {
1467 .ctrl_default = SPA_CTRL_CIPH_ALG_AES | SPA_CTRL_CIPH_MODE_CBC |
1468 SPA_CTRL_HASH_ALG_SHA | SPA_CTRL_HASH_MODE_HMAC,
1469 .key_offs = 0,
1470 .iv_offs = AES_MAX_KEY_SIZE,
1471 .alg = {
1472 .cra_name = "authenc(hmac(sha1),cbc(aes))",
1473 .cra_driver_name = "authenc-hmac-sha1-cbc-aes-picoxcell",
1474 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1475 .cra_flags = CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_ASYNC,
1476 .cra_blocksize = AES_BLOCK_SIZE,
1477 .cra_ctxsize = sizeof(struct spacc_aead_ctx),
1478 .cra_type = &crypto_aead_type,
1479 .cra_module = THIS_MODULE,
1480 .cra_aead = {
1481 .setkey = spacc_aead_setkey,
1482 .setauthsize = spacc_aead_setauthsize,
1483 .encrypt = spacc_aead_encrypt,
1484 .decrypt = spacc_aead_decrypt,
1485 .givencrypt = spacc_aead_givencrypt,
1486 .ivsize = AES_BLOCK_SIZE,
1487 .maxauthsize = SHA1_DIGEST_SIZE,
1488 },
1489 .cra_init = spacc_aead_cra_init,
1490 .cra_exit = spacc_aead_cra_exit,
1491 },
1492 },
1493 {
1494 .ctrl_default = SPA_CTRL_CIPH_ALG_AES | SPA_CTRL_CIPH_MODE_CBC |
1495 SPA_CTRL_HASH_ALG_SHA256 |
1496 SPA_CTRL_HASH_MODE_HMAC,
1497 .key_offs = 0,
1498 .iv_offs = AES_MAX_KEY_SIZE,
1499 .alg = {
1500 .cra_name = "authenc(hmac(sha256),cbc(aes))",
1501 .cra_driver_name = "authenc-hmac-sha256-cbc-aes-picoxcell",
1502 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1503 .cra_flags = CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_ASYNC,
1504 .cra_blocksize = AES_BLOCK_SIZE,
1505 .cra_ctxsize = sizeof(struct spacc_aead_ctx),
1506 .cra_type = &crypto_aead_type,
1507 .cra_module = THIS_MODULE,
1508 .cra_aead = {
1509 .setkey = spacc_aead_setkey,
1510 .setauthsize = spacc_aead_setauthsize,
1511 .encrypt = spacc_aead_encrypt,
1512 .decrypt = spacc_aead_decrypt,
1513 .givencrypt = spacc_aead_givencrypt,
1514 .ivsize = AES_BLOCK_SIZE,
1515 .maxauthsize = SHA256_DIGEST_SIZE,
1516 },
1517 .cra_init = spacc_aead_cra_init,
1518 .cra_exit = spacc_aead_cra_exit,
1519 },
1520 },
1521 {
1522 .key_offs = 0,
1523 .iv_offs = AES_MAX_KEY_SIZE,
1524 .ctrl_default = SPA_CTRL_CIPH_ALG_AES | SPA_CTRL_CIPH_MODE_CBC |
1525 SPA_CTRL_HASH_ALG_MD5 | SPA_CTRL_HASH_MODE_HMAC,
1526 .alg = {
1527 .cra_name = "authenc(hmac(md5),cbc(aes))",
1528 .cra_driver_name = "authenc-hmac-md5-cbc-aes-picoxcell",
1529 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1530 .cra_flags = CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_ASYNC,
1531 .cra_blocksize = AES_BLOCK_SIZE,
1532 .cra_ctxsize = sizeof(struct spacc_aead_ctx),
1533 .cra_type = &crypto_aead_type,
1534 .cra_module = THIS_MODULE,
1535 .cra_aead = {
1536 .setkey = spacc_aead_setkey,
1537 .setauthsize = spacc_aead_setauthsize,
1538 .encrypt = spacc_aead_encrypt,
1539 .decrypt = spacc_aead_decrypt,
1540 .givencrypt = spacc_aead_givencrypt,
1541 .ivsize = AES_BLOCK_SIZE,
1542 .maxauthsize = MD5_DIGEST_SIZE,
1543 },
1544 .cra_init = spacc_aead_cra_init,
1545 .cra_exit = spacc_aead_cra_exit,
1546 },
1547 },
1548 {
1549 .key_offs = DES_BLOCK_SIZE,
1550 .iv_offs = 0,
1551 .ctrl_default = SPA_CTRL_CIPH_ALG_DES | SPA_CTRL_CIPH_MODE_CBC |
1552 SPA_CTRL_HASH_ALG_SHA | SPA_CTRL_HASH_MODE_HMAC,
1553 .alg = {
1554 .cra_name = "authenc(hmac(sha1),cbc(des3_ede))",
1555 .cra_driver_name = "authenc-hmac-sha1-cbc-3des-picoxcell",
1556 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1557 .cra_flags = CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_ASYNC,
1558 .cra_blocksize = DES3_EDE_BLOCK_SIZE,
1559 .cra_ctxsize = sizeof(struct spacc_aead_ctx),
1560 .cra_type = &crypto_aead_type,
1561 .cra_module = THIS_MODULE,
1562 .cra_aead = {
1563 .setkey = spacc_aead_setkey,
1564 .setauthsize = spacc_aead_setauthsize,
1565 .encrypt = spacc_aead_encrypt,
1566 .decrypt = spacc_aead_decrypt,
1567 .givencrypt = spacc_aead_givencrypt,
1568 .ivsize = DES3_EDE_BLOCK_SIZE,
1569 .maxauthsize = SHA1_DIGEST_SIZE,
1570 },
1571 .cra_init = spacc_aead_cra_init,
1572 .cra_exit = spacc_aead_cra_exit,
1573 },
1574 },
1575 {
1576 .key_offs = DES_BLOCK_SIZE,
1577 .iv_offs = 0,
1578 .ctrl_default = SPA_CTRL_CIPH_ALG_AES | SPA_CTRL_CIPH_MODE_CBC |
1579 SPA_CTRL_HASH_ALG_SHA256 |
1580 SPA_CTRL_HASH_MODE_HMAC,
1581 .alg = {
1582 .cra_name = "authenc(hmac(sha256),cbc(des3_ede))",
1583 .cra_driver_name = "authenc-hmac-sha256-cbc-3des-picoxcell",
1584 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1585 .cra_flags = CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_ASYNC,
1586 .cra_blocksize = DES3_EDE_BLOCK_SIZE,
1587 .cra_ctxsize = sizeof(struct spacc_aead_ctx),
1588 .cra_type = &crypto_aead_type,
1589 .cra_module = THIS_MODULE,
1590 .cra_aead = {
1591 .setkey = spacc_aead_setkey,
1592 .setauthsize = spacc_aead_setauthsize,
1593 .encrypt = spacc_aead_encrypt,
1594 .decrypt = spacc_aead_decrypt,
1595 .givencrypt = spacc_aead_givencrypt,
1596 .ivsize = DES3_EDE_BLOCK_SIZE,
1597 .maxauthsize = SHA256_DIGEST_SIZE,
1598 },
1599 .cra_init = spacc_aead_cra_init,
1600 .cra_exit = spacc_aead_cra_exit,
1601 },
1602 },
1603 {
1604 .key_offs = DES_BLOCK_SIZE,
1605 .iv_offs = 0,
1606 .ctrl_default = SPA_CTRL_CIPH_ALG_DES | SPA_CTRL_CIPH_MODE_CBC |
1607 SPA_CTRL_HASH_ALG_MD5 | SPA_CTRL_HASH_MODE_HMAC,
1608 .alg = {
1609 .cra_name = "authenc(hmac(md5),cbc(des3_ede))",
1610 .cra_driver_name = "authenc-hmac-md5-cbc-3des-picoxcell",
1611 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1612 .cra_flags = CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_ASYNC,
1613 .cra_blocksize = DES3_EDE_BLOCK_SIZE,
1614 .cra_ctxsize = sizeof(struct spacc_aead_ctx),
1615 .cra_type = &crypto_aead_type,
1616 .cra_module = THIS_MODULE,
1617 .cra_aead = {
1618 .setkey = spacc_aead_setkey,
1619 .setauthsize = spacc_aead_setauthsize,
1620 .encrypt = spacc_aead_encrypt,
1621 .decrypt = spacc_aead_decrypt,
1622 .givencrypt = spacc_aead_givencrypt,
1623 .ivsize = DES3_EDE_BLOCK_SIZE,
1624 .maxauthsize = MD5_DIGEST_SIZE,
1625 },
1626 .cra_init = spacc_aead_cra_init,
1627 .cra_exit = spacc_aead_cra_exit,
1628 },
1629 },
1630 };
1631
1632 static struct spacc_alg l2_engine_algs[] = {
1633 {
1634 .key_offs = 0,
1635 .iv_offs = SPACC_CRYPTO_KASUMI_F8_KEY_LEN,
1636 .ctrl_default = SPA_CTRL_CIPH_ALG_KASUMI |
1637 SPA_CTRL_CIPH_MODE_F8,
1638 .alg = {
1639 .cra_name = "f8(kasumi)",
1640 .cra_driver_name = "f8-kasumi-picoxcell",
1641 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1642 .cra_flags = CRYPTO_ALG_TYPE_GIVCIPHER | CRYPTO_ALG_ASYNC,
1643 .cra_blocksize = 8,
1644 .cra_ctxsize = sizeof(struct spacc_ablk_ctx),
1645 .cra_type = &crypto_ablkcipher_type,
1646 .cra_module = THIS_MODULE,
1647 .cra_ablkcipher = {
1648 .setkey = spacc_kasumi_f8_setkey,
1649 .encrypt = spacc_ablk_encrypt,
1650 .decrypt = spacc_ablk_decrypt,
1651 .min_keysize = 16,
1652 .max_keysize = 16,
1653 .ivsize = 8,
1654 },
1655 .cra_init = spacc_ablk_cra_init,
1656 .cra_exit = spacc_ablk_cra_exit,
1657 },
1658 },
1659 };
1660
1661 #ifdef CONFIG_OF
1662 static const struct of_device_id spacc_of_id_table[] = {
1663 { .compatible = "picochip,spacc-ipsec" },
1664 { .compatible = "picochip,spacc-l2" },
1665 {}
1666 };
1667 #else /* CONFIG_OF */
1668 #define spacc_of_id_table NULL
1669 #endif /* CONFIG_OF */
1670
spacc_is_compatible(struct platform_device * pdev,const char * spacc_type)1671 static bool spacc_is_compatible(struct platform_device *pdev,
1672 const char *spacc_type)
1673 {
1674 const struct platform_device_id *platid = platform_get_device_id(pdev);
1675
1676 if (platid && !strcmp(platid->name, spacc_type))
1677 return true;
1678
1679 #ifdef CONFIG_OF
1680 if (of_device_is_compatible(pdev->dev.of_node, spacc_type))
1681 return true;
1682 #endif /* CONFIG_OF */
1683
1684 return false;
1685 }
1686
spacc_probe(struct platform_device * pdev)1687 static int __devinit spacc_probe(struct platform_device *pdev)
1688 {
1689 int i, err, ret = -EINVAL;
1690 struct resource *mem, *irq;
1691 struct spacc_engine *engine = devm_kzalloc(&pdev->dev, sizeof(*engine),
1692 GFP_KERNEL);
1693 if (!engine)
1694 return -ENOMEM;
1695
1696 if (spacc_is_compatible(pdev, "picochip,spacc-ipsec")) {
1697 engine->max_ctxs = SPACC_CRYPTO_IPSEC_MAX_CTXS;
1698 engine->cipher_pg_sz = SPACC_CRYPTO_IPSEC_CIPHER_PG_SZ;
1699 engine->hash_pg_sz = SPACC_CRYPTO_IPSEC_HASH_PG_SZ;
1700 engine->fifo_sz = SPACC_CRYPTO_IPSEC_FIFO_SZ;
1701 engine->algs = ipsec_engine_algs;
1702 engine->num_algs = ARRAY_SIZE(ipsec_engine_algs);
1703 } else if (spacc_is_compatible(pdev, "picochip,spacc-l2")) {
1704 engine->max_ctxs = SPACC_CRYPTO_L2_MAX_CTXS;
1705 engine->cipher_pg_sz = SPACC_CRYPTO_L2_CIPHER_PG_SZ;
1706 engine->hash_pg_sz = SPACC_CRYPTO_L2_HASH_PG_SZ;
1707 engine->fifo_sz = SPACC_CRYPTO_L2_FIFO_SZ;
1708 engine->algs = l2_engine_algs;
1709 engine->num_algs = ARRAY_SIZE(l2_engine_algs);
1710 } else {
1711 return -EINVAL;
1712 }
1713
1714 engine->name = dev_name(&pdev->dev);
1715
1716 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1717 irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1718 if (!mem || !irq) {
1719 dev_err(&pdev->dev, "no memory/irq resource for engine\n");
1720 return -ENXIO;
1721 }
1722
1723 if (!devm_request_mem_region(&pdev->dev, mem->start, resource_size(mem),
1724 engine->name))
1725 return -ENOMEM;
1726
1727 engine->regs = devm_ioremap(&pdev->dev, mem->start, resource_size(mem));
1728 if (!engine->regs) {
1729 dev_err(&pdev->dev, "memory map failed\n");
1730 return -ENOMEM;
1731 }
1732
1733 if (devm_request_irq(&pdev->dev, irq->start, spacc_spacc_irq, 0,
1734 engine->name, engine)) {
1735 dev_err(engine->dev, "failed to request IRQ\n");
1736 return -EBUSY;
1737 }
1738
1739 engine->dev = &pdev->dev;
1740 engine->cipher_ctx_base = engine->regs + SPA_CIPH_KEY_BASE_REG_OFFSET;
1741 engine->hash_key_base = engine->regs + SPA_HASH_KEY_BASE_REG_OFFSET;
1742
1743 engine->req_pool = dmam_pool_create(engine->name, engine->dev,
1744 MAX_DDT_LEN * sizeof(struct spacc_ddt), 8, SZ_64K);
1745 if (!engine->req_pool)
1746 return -ENOMEM;
1747
1748 spin_lock_init(&engine->hw_lock);
1749
1750 engine->clk = clk_get(&pdev->dev, "ref");
1751 if (IS_ERR(engine->clk)) {
1752 dev_info(&pdev->dev, "clk unavailable\n");
1753 device_remove_file(&pdev->dev, &dev_attr_stat_irq_thresh);
1754 return PTR_ERR(engine->clk);
1755 }
1756
1757 if (clk_enable(engine->clk)) {
1758 dev_info(&pdev->dev, "unable to enable clk\n");
1759 clk_put(engine->clk);
1760 return -EIO;
1761 }
1762
1763 err = device_create_file(&pdev->dev, &dev_attr_stat_irq_thresh);
1764 if (err) {
1765 clk_disable(engine->clk);
1766 clk_put(engine->clk);
1767 return err;
1768 }
1769
1770
1771 /*
1772 * Use an IRQ threshold of 50% as a default. This seems to be a
1773 * reasonable trade off of latency against throughput but can be
1774 * changed at runtime.
1775 */
1776 engine->stat_irq_thresh = (engine->fifo_sz / 2);
1777
1778 /*
1779 * Configure the interrupts. We only use the STAT_CNT interrupt as we
1780 * only submit a new packet for processing when we complete another in
1781 * the queue. This minimizes time spent in the interrupt handler.
1782 */
1783 writel(engine->stat_irq_thresh << SPA_IRQ_CTRL_STAT_CNT_OFFSET,
1784 engine->regs + SPA_IRQ_CTRL_REG_OFFSET);
1785 writel(SPA_IRQ_EN_STAT_EN | SPA_IRQ_EN_GLBL_EN,
1786 engine->regs + SPA_IRQ_EN_REG_OFFSET);
1787
1788 setup_timer(&engine->packet_timeout, spacc_packet_timeout,
1789 (unsigned long)engine);
1790
1791 INIT_LIST_HEAD(&engine->pending);
1792 INIT_LIST_HEAD(&engine->completed);
1793 INIT_LIST_HEAD(&engine->in_progress);
1794 engine->in_flight = 0;
1795 tasklet_init(&engine->complete, spacc_spacc_complete,
1796 (unsigned long)engine);
1797
1798 platform_set_drvdata(pdev, engine);
1799
1800 INIT_LIST_HEAD(&engine->registered_algs);
1801 for (i = 0; i < engine->num_algs; ++i) {
1802 engine->algs[i].engine = engine;
1803 err = crypto_register_alg(&engine->algs[i].alg);
1804 if (!err) {
1805 list_add_tail(&engine->algs[i].entry,
1806 &engine->registered_algs);
1807 ret = 0;
1808 }
1809 if (err)
1810 dev_err(engine->dev, "failed to register alg \"%s\"\n",
1811 engine->algs[i].alg.cra_name);
1812 else
1813 dev_dbg(engine->dev, "registered alg \"%s\"\n",
1814 engine->algs[i].alg.cra_name);
1815 }
1816
1817 return ret;
1818 }
1819
spacc_remove(struct platform_device * pdev)1820 static int __devexit spacc_remove(struct platform_device *pdev)
1821 {
1822 struct spacc_alg *alg, *next;
1823 struct spacc_engine *engine = platform_get_drvdata(pdev);
1824
1825 del_timer_sync(&engine->packet_timeout);
1826 device_remove_file(&pdev->dev, &dev_attr_stat_irq_thresh);
1827
1828 list_for_each_entry_safe(alg, next, &engine->registered_algs, entry) {
1829 list_del(&alg->entry);
1830 crypto_unregister_alg(&alg->alg);
1831 }
1832
1833 clk_disable(engine->clk);
1834 clk_put(engine->clk);
1835
1836 return 0;
1837 }
1838
1839 static const struct platform_device_id spacc_id_table[] = {
1840 { "picochip,spacc-ipsec", },
1841 { "picochip,spacc-l2", },
1842 };
1843
1844 static struct platform_driver spacc_driver = {
1845 .probe = spacc_probe,
1846 .remove = __devexit_p(spacc_remove),
1847 .driver = {
1848 .name = "picochip,spacc",
1849 #ifdef CONFIG_PM
1850 .pm = &spacc_pm_ops,
1851 #endif /* CONFIG_PM */
1852 .of_match_table = spacc_of_id_table,
1853 },
1854 .id_table = spacc_id_table,
1855 };
1856
1857 module_platform_driver(spacc_driver);
1858
1859 MODULE_LICENSE("GPL");
1860 MODULE_AUTHOR("Jamie Iles");
1861