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
to_spacc_alg(struct crypto_alg * alg)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
to_spacc_aead(struct aead_alg * alg)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
spacc_fifo_cmd_full(struct spacc_engine * engine)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 */
spacc_ctx_page_addr(struct spacc_generic_ctx * ctx,unsigned indx,bool is_cipher_ctx)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. */
memcpy_toio32(u32 __iomem * dst,const void * src,unsigned count)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
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)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 */
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)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
ddt_set(struct spacc_ddt * ddt,dma_addr_t phys,size_t len)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 */
spacc_sg_to_ddt(struct spacc_engine * engine,struct scatterlist * payload,unsigned nbytes,enum dma_data_direction dir,dma_addr_t * ddt_phys)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
spacc_aead_make_ddts(struct aead_request * areq)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
spacc_aead_free_ddts(struct spacc_req * req)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
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)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
spacc_aead_setkey(struct crypto_aead * tfm,const u8 * key,unsigned int keylen)470 static int spacc_aead_setkey(struct crypto_aead *tfm, const u8 *key,
471 unsigned int keylen)
472 {
473 struct spacc_aead_ctx *ctx = crypto_aead_ctx(tfm);
474 struct crypto_authenc_keys keys;
475 int err;
476
477 crypto_aead_clear_flags(ctx->sw_cipher, CRYPTO_TFM_REQ_MASK);
478 crypto_aead_set_flags(ctx->sw_cipher, crypto_aead_get_flags(tfm) &
479 CRYPTO_TFM_REQ_MASK);
480 err = crypto_aead_setkey(ctx->sw_cipher, key, keylen);
481 crypto_aead_clear_flags(tfm, CRYPTO_TFM_RES_MASK);
482 crypto_aead_set_flags(tfm, crypto_aead_get_flags(ctx->sw_cipher) &
483 CRYPTO_TFM_RES_MASK);
484 if (err)
485 return err;
486
487 if (crypto_authenc_extractkeys(&keys, key, keylen) != 0)
488 goto badkey;
489
490 if (keys.enckeylen > AES_MAX_KEY_SIZE)
491 goto badkey;
492
493 if (keys.authkeylen > sizeof(ctx->hash_ctx))
494 goto badkey;
495
496 memcpy(ctx->cipher_key, keys.enckey, keys.enckeylen);
497 ctx->cipher_key_len = keys.enckeylen;
498
499 memcpy(ctx->hash_ctx, keys.authkey, keys.authkeylen);
500 ctx->hash_key_len = keys.authkeylen;
501
502 memzero_explicit(&keys, sizeof(keys));
503 return 0;
504
505 badkey:
506 crypto_aead_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
507 memzero_explicit(&keys, sizeof(keys));
508 return -EINVAL;
509 }
510
spacc_aead_setauthsize(struct crypto_aead * tfm,unsigned int authsize)511 static int spacc_aead_setauthsize(struct crypto_aead *tfm,
512 unsigned int authsize)
513 {
514 struct spacc_aead_ctx *ctx = crypto_tfm_ctx(crypto_aead_tfm(tfm));
515
516 return crypto_aead_setauthsize(ctx->sw_cipher, authsize);
517 }
518
519 /*
520 * Check if an AEAD request requires a fallback operation. Some requests can't
521 * be completed in hardware because the hardware may not support certain key
522 * sizes. In these cases we need to complete the request in software.
523 */
spacc_aead_need_fallback(struct aead_request * aead_req)524 static int spacc_aead_need_fallback(struct aead_request *aead_req)
525 {
526 struct crypto_aead *aead = crypto_aead_reqtfm(aead_req);
527 struct aead_alg *alg = crypto_aead_alg(aead);
528 struct spacc_aead *spacc_alg = to_spacc_aead(alg);
529 struct spacc_aead_ctx *ctx = crypto_aead_ctx(aead);
530
531 /*
532 * If we have a non-supported key-length, then we need to do a
533 * software fallback.
534 */
535 if ((spacc_alg->ctrl_default & SPACC_CRYPTO_ALG_MASK) ==
536 SPA_CTRL_CIPH_ALG_AES &&
537 ctx->cipher_key_len != AES_KEYSIZE_128 &&
538 ctx->cipher_key_len != AES_KEYSIZE_256)
539 return 1;
540
541 return 0;
542 }
543
spacc_aead_do_fallback(struct aead_request * req,unsigned alg_type,bool is_encrypt)544 static int spacc_aead_do_fallback(struct aead_request *req, unsigned alg_type,
545 bool is_encrypt)
546 {
547 struct crypto_tfm *old_tfm = crypto_aead_tfm(crypto_aead_reqtfm(req));
548 struct spacc_aead_ctx *ctx = crypto_tfm_ctx(old_tfm);
549 struct aead_request *subreq = aead_request_ctx(req);
550
551 aead_request_set_tfm(subreq, ctx->sw_cipher);
552 aead_request_set_callback(subreq, req->base.flags,
553 req->base.complete, req->base.data);
554 aead_request_set_crypt(subreq, req->src, req->dst, req->cryptlen,
555 req->iv);
556 aead_request_set_ad(subreq, req->assoclen);
557
558 return is_encrypt ? crypto_aead_encrypt(subreq) :
559 crypto_aead_decrypt(subreq);
560 }
561
spacc_aead_complete(struct spacc_req * req)562 static void spacc_aead_complete(struct spacc_req *req)
563 {
564 spacc_aead_free_ddts(req);
565 req->req->complete(req->req, req->result);
566 }
567
spacc_aead_submit(struct spacc_req * req)568 static int spacc_aead_submit(struct spacc_req *req)
569 {
570 struct aead_request *aead_req =
571 container_of(req->req, struct aead_request, base);
572 struct crypto_aead *aead = crypto_aead_reqtfm(aead_req);
573 unsigned int authsize = crypto_aead_authsize(aead);
574 struct spacc_aead_ctx *ctx = crypto_aead_ctx(aead);
575 struct aead_alg *alg = crypto_aead_alg(aead);
576 struct spacc_aead *spacc_alg = to_spacc_aead(alg);
577 struct spacc_engine *engine = ctx->generic.engine;
578 u32 ctrl, proc_len, assoc_len;
579
580 req->result = -EINPROGRESS;
581 req->ctx_id = spacc_load_ctx(&ctx->generic, ctx->cipher_key,
582 ctx->cipher_key_len, aead_req->iv, crypto_aead_ivsize(aead),
583 ctx->hash_ctx, ctx->hash_key_len);
584
585 /* Set the source and destination DDT pointers. */
586 writel(req->src_addr, engine->regs + SPA_SRC_PTR_REG_OFFSET);
587 writel(req->dst_addr, engine->regs + SPA_DST_PTR_REG_OFFSET);
588 writel(0, engine->regs + SPA_OFFSET_REG_OFFSET);
589
590 assoc_len = aead_req->assoclen;
591 proc_len = aead_req->cryptlen + assoc_len;
592
593 /*
594 * If we are decrypting, we need to take the length of the ICV out of
595 * the processing length.
596 */
597 if (!req->is_encrypt)
598 proc_len -= authsize;
599
600 writel(proc_len, engine->regs + SPA_PROC_LEN_REG_OFFSET);
601 writel(assoc_len, engine->regs + SPA_AAD_LEN_REG_OFFSET);
602 writel(authsize, engine->regs + SPA_ICV_LEN_REG_OFFSET);
603 writel(0, engine->regs + SPA_ICV_OFFSET_REG_OFFSET);
604 writel(0, engine->regs + SPA_AUX_INFO_REG_OFFSET);
605
606 ctrl = spacc_alg->ctrl_default | (req->ctx_id << SPA_CTRL_CTX_IDX) |
607 (1 << SPA_CTRL_ICV_APPEND);
608 if (req->is_encrypt)
609 ctrl |= (1 << SPA_CTRL_ENCRYPT_IDX) | (1 << SPA_CTRL_AAD_COPY);
610 else
611 ctrl |= (1 << SPA_CTRL_KEY_EXP);
612
613 mod_timer(&engine->packet_timeout, jiffies + PACKET_TIMEOUT);
614
615 writel(ctrl, engine->regs + SPA_CTRL_REG_OFFSET);
616
617 return -EINPROGRESS;
618 }
619
620 static int spacc_req_submit(struct spacc_req *req);
621
spacc_push(struct spacc_engine * engine)622 static void spacc_push(struct spacc_engine *engine)
623 {
624 struct spacc_req *req;
625
626 while (!list_empty(&engine->pending) &&
627 engine->in_flight + 1 <= engine->fifo_sz) {
628
629 ++engine->in_flight;
630 req = list_first_entry(&engine->pending, struct spacc_req,
631 list);
632 list_move_tail(&req->list, &engine->in_progress);
633
634 req->result = spacc_req_submit(req);
635 }
636 }
637
638 /*
639 * Setup an AEAD request for processing. This will configure the engine, load
640 * the context and then start the packet processing.
641 */
spacc_aead_setup(struct aead_request * req,unsigned alg_type,bool is_encrypt)642 static int spacc_aead_setup(struct aead_request *req,
643 unsigned alg_type, bool is_encrypt)
644 {
645 struct crypto_aead *aead = crypto_aead_reqtfm(req);
646 struct aead_alg *alg = crypto_aead_alg(aead);
647 struct spacc_engine *engine = to_spacc_aead(alg)->engine;
648 struct spacc_req *dev_req = aead_request_ctx(req);
649 int err;
650 unsigned long flags;
651
652 dev_req->req = &req->base;
653 dev_req->is_encrypt = is_encrypt;
654 dev_req->result = -EBUSY;
655 dev_req->engine = engine;
656 dev_req->complete = spacc_aead_complete;
657
658 if (unlikely(spacc_aead_need_fallback(req) ||
659 ((err = spacc_aead_make_ddts(req)) == -E2BIG)))
660 return spacc_aead_do_fallback(req, alg_type, is_encrypt);
661
662 if (err)
663 goto out;
664
665 err = -EINPROGRESS;
666 spin_lock_irqsave(&engine->hw_lock, flags);
667 if (unlikely(spacc_fifo_cmd_full(engine)) ||
668 engine->in_flight + 1 > engine->fifo_sz) {
669 if (!(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
670 err = -EBUSY;
671 spin_unlock_irqrestore(&engine->hw_lock, flags);
672 goto out_free_ddts;
673 }
674 list_add_tail(&dev_req->list, &engine->pending);
675 } else {
676 list_add_tail(&dev_req->list, &engine->pending);
677 spacc_push(engine);
678 }
679 spin_unlock_irqrestore(&engine->hw_lock, flags);
680
681 goto out;
682
683 out_free_ddts:
684 spacc_aead_free_ddts(dev_req);
685 out:
686 return err;
687 }
688
spacc_aead_encrypt(struct aead_request * req)689 static int spacc_aead_encrypt(struct aead_request *req)
690 {
691 struct crypto_aead *aead = crypto_aead_reqtfm(req);
692 struct spacc_aead *alg = to_spacc_aead(crypto_aead_alg(aead));
693
694 return spacc_aead_setup(req, alg->type, 1);
695 }
696
spacc_aead_decrypt(struct aead_request * req)697 static int spacc_aead_decrypt(struct aead_request *req)
698 {
699 struct crypto_aead *aead = crypto_aead_reqtfm(req);
700 struct spacc_aead *alg = to_spacc_aead(crypto_aead_alg(aead));
701
702 return spacc_aead_setup(req, alg->type, 0);
703 }
704
705 /*
706 * Initialise a new AEAD context. This is responsible for allocating the
707 * fallback cipher and initialising the context.
708 */
spacc_aead_cra_init(struct crypto_aead * tfm)709 static int spacc_aead_cra_init(struct crypto_aead *tfm)
710 {
711 struct spacc_aead_ctx *ctx = crypto_aead_ctx(tfm);
712 struct aead_alg *alg = crypto_aead_alg(tfm);
713 struct spacc_aead *spacc_alg = to_spacc_aead(alg);
714 struct spacc_engine *engine = spacc_alg->engine;
715
716 ctx->generic.flags = spacc_alg->type;
717 ctx->generic.engine = engine;
718 ctx->sw_cipher = crypto_alloc_aead(alg->base.cra_name, 0,
719 CRYPTO_ALG_NEED_FALLBACK);
720 if (IS_ERR(ctx->sw_cipher))
721 return PTR_ERR(ctx->sw_cipher);
722 ctx->generic.key_offs = spacc_alg->key_offs;
723 ctx->generic.iv_offs = spacc_alg->iv_offs;
724
725 crypto_aead_set_reqsize(
726 tfm,
727 max(sizeof(struct spacc_req),
728 sizeof(struct aead_request) +
729 crypto_aead_reqsize(ctx->sw_cipher)));
730
731 return 0;
732 }
733
734 /*
735 * Destructor for an AEAD context. This is called when the transform is freed
736 * and must free the fallback cipher.
737 */
spacc_aead_cra_exit(struct crypto_aead * tfm)738 static void spacc_aead_cra_exit(struct crypto_aead *tfm)
739 {
740 struct spacc_aead_ctx *ctx = crypto_aead_ctx(tfm);
741
742 crypto_free_aead(ctx->sw_cipher);
743 }
744
745 /*
746 * Set the DES key for a block cipher transform. This also performs weak key
747 * checking if the transform has requested it.
748 */
spacc_des_setkey(struct crypto_ablkcipher * cipher,const u8 * key,unsigned int len)749 static int spacc_des_setkey(struct crypto_ablkcipher *cipher, const u8 *key,
750 unsigned int len)
751 {
752 struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
753 struct spacc_ablk_ctx *ctx = crypto_tfm_ctx(tfm);
754 u32 tmp[DES_EXPKEY_WORDS];
755
756 if (len > DES3_EDE_KEY_SIZE) {
757 crypto_ablkcipher_set_flags(cipher, CRYPTO_TFM_RES_BAD_KEY_LEN);
758 return -EINVAL;
759 }
760
761 if (unlikely(!des_ekey(tmp, key)) &&
762 (crypto_ablkcipher_get_flags(cipher) & CRYPTO_TFM_REQ_WEAK_KEY)) {
763 tfm->crt_flags |= CRYPTO_TFM_RES_WEAK_KEY;
764 return -EINVAL;
765 }
766
767 memcpy(ctx->key, key, len);
768 ctx->key_len = len;
769
770 return 0;
771 }
772
773 /*
774 * Set the key for an AES block cipher. Some key lengths are not supported in
775 * hardware so this must also check whether a fallback is needed.
776 */
spacc_aes_setkey(struct crypto_ablkcipher * cipher,const u8 * key,unsigned int len)777 static int spacc_aes_setkey(struct crypto_ablkcipher *cipher, const u8 *key,
778 unsigned int len)
779 {
780 struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
781 struct spacc_ablk_ctx *ctx = crypto_tfm_ctx(tfm);
782 int err = 0;
783
784 if (len > AES_MAX_KEY_SIZE) {
785 crypto_ablkcipher_set_flags(cipher, CRYPTO_TFM_RES_BAD_KEY_LEN);
786 return -EINVAL;
787 }
788
789 /*
790 * IPSec engine only supports 128 and 256 bit AES keys. If we get a
791 * request for any other size (192 bits) then we need to do a software
792 * fallback.
793 */
794 if (len != AES_KEYSIZE_128 && len != AES_KEYSIZE_256) {
795 if (!ctx->sw_cipher)
796 return -EINVAL;
797
798 /*
799 * Set the fallback transform to use the same request flags as
800 * the hardware transform.
801 */
802 crypto_skcipher_clear_flags(ctx->sw_cipher,
803 CRYPTO_TFM_REQ_MASK);
804 crypto_skcipher_set_flags(ctx->sw_cipher,
805 cipher->base.crt_flags &
806 CRYPTO_TFM_REQ_MASK);
807
808 err = crypto_skcipher_setkey(ctx->sw_cipher, key, len);
809
810 tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
811 tfm->crt_flags |=
812 crypto_skcipher_get_flags(ctx->sw_cipher) &
813 CRYPTO_TFM_RES_MASK;
814
815 if (err)
816 goto sw_setkey_failed;
817 }
818
819 memcpy(ctx->key, key, len);
820 ctx->key_len = len;
821
822 sw_setkey_failed:
823 return err;
824 }
825
spacc_kasumi_f8_setkey(struct crypto_ablkcipher * cipher,const u8 * key,unsigned int len)826 static int spacc_kasumi_f8_setkey(struct crypto_ablkcipher *cipher,
827 const u8 *key, unsigned int len)
828 {
829 struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
830 struct spacc_ablk_ctx *ctx = crypto_tfm_ctx(tfm);
831 int err = 0;
832
833 if (len > AES_MAX_KEY_SIZE) {
834 crypto_ablkcipher_set_flags(cipher, CRYPTO_TFM_RES_BAD_KEY_LEN);
835 err = -EINVAL;
836 goto out;
837 }
838
839 memcpy(ctx->key, key, len);
840 ctx->key_len = len;
841
842 out:
843 return err;
844 }
845
spacc_ablk_need_fallback(struct spacc_req * req)846 static int spacc_ablk_need_fallback(struct spacc_req *req)
847 {
848 struct spacc_ablk_ctx *ctx;
849 struct crypto_tfm *tfm = req->req->tfm;
850 struct crypto_alg *alg = req->req->tfm->__crt_alg;
851 struct spacc_alg *spacc_alg = to_spacc_alg(alg);
852
853 ctx = crypto_tfm_ctx(tfm);
854
855 return (spacc_alg->ctrl_default & SPACC_CRYPTO_ALG_MASK) ==
856 SPA_CTRL_CIPH_ALG_AES &&
857 ctx->key_len != AES_KEYSIZE_128 &&
858 ctx->key_len != AES_KEYSIZE_256;
859 }
860
spacc_ablk_complete(struct spacc_req * req)861 static void spacc_ablk_complete(struct spacc_req *req)
862 {
863 struct ablkcipher_request *ablk_req = ablkcipher_request_cast(req->req);
864
865 if (ablk_req->src != ablk_req->dst) {
866 spacc_free_ddt(req, req->src_ddt, req->src_addr, ablk_req->src,
867 ablk_req->nbytes, DMA_TO_DEVICE);
868 spacc_free_ddt(req, req->dst_ddt, req->dst_addr, ablk_req->dst,
869 ablk_req->nbytes, DMA_FROM_DEVICE);
870 } else
871 spacc_free_ddt(req, req->dst_ddt, req->dst_addr, ablk_req->dst,
872 ablk_req->nbytes, DMA_BIDIRECTIONAL);
873
874 req->req->complete(req->req, req->result);
875 }
876
spacc_ablk_submit(struct spacc_req * req)877 static int spacc_ablk_submit(struct spacc_req *req)
878 {
879 struct crypto_tfm *tfm = req->req->tfm;
880 struct spacc_ablk_ctx *ctx = crypto_tfm_ctx(tfm);
881 struct ablkcipher_request *ablk_req = ablkcipher_request_cast(req->req);
882 struct crypto_alg *alg = req->req->tfm->__crt_alg;
883 struct spacc_alg *spacc_alg = to_spacc_alg(alg);
884 struct spacc_engine *engine = ctx->generic.engine;
885 u32 ctrl;
886
887 req->ctx_id = spacc_load_ctx(&ctx->generic, ctx->key,
888 ctx->key_len, ablk_req->info, alg->cra_ablkcipher.ivsize,
889 NULL, 0);
890
891 writel(req->src_addr, engine->regs + SPA_SRC_PTR_REG_OFFSET);
892 writel(req->dst_addr, engine->regs + SPA_DST_PTR_REG_OFFSET);
893 writel(0, engine->regs + SPA_OFFSET_REG_OFFSET);
894
895 writel(ablk_req->nbytes, engine->regs + SPA_PROC_LEN_REG_OFFSET);
896 writel(0, engine->regs + SPA_ICV_OFFSET_REG_OFFSET);
897 writel(0, engine->regs + SPA_AUX_INFO_REG_OFFSET);
898 writel(0, engine->regs + SPA_AAD_LEN_REG_OFFSET);
899
900 ctrl = spacc_alg->ctrl_default | (req->ctx_id << SPA_CTRL_CTX_IDX) |
901 (req->is_encrypt ? (1 << SPA_CTRL_ENCRYPT_IDX) :
902 (1 << SPA_CTRL_KEY_EXP));
903
904 mod_timer(&engine->packet_timeout, jiffies + PACKET_TIMEOUT);
905
906 writel(ctrl, engine->regs + SPA_CTRL_REG_OFFSET);
907
908 return -EINPROGRESS;
909 }
910
spacc_ablk_do_fallback(struct ablkcipher_request * req,unsigned alg_type,bool is_encrypt)911 static int spacc_ablk_do_fallback(struct ablkcipher_request *req,
912 unsigned alg_type, bool is_encrypt)
913 {
914 struct crypto_tfm *old_tfm =
915 crypto_ablkcipher_tfm(crypto_ablkcipher_reqtfm(req));
916 struct spacc_ablk_ctx *ctx = crypto_tfm_ctx(old_tfm);
917 SKCIPHER_REQUEST_ON_STACK(subreq, ctx->sw_cipher);
918 int err;
919
920 /*
921 * Change the request to use the software fallback transform, and once
922 * the ciphering has completed, put the old transform back into the
923 * request.
924 */
925 skcipher_request_set_tfm(subreq, ctx->sw_cipher);
926 skcipher_request_set_callback(subreq, req->base.flags, NULL, NULL);
927 skcipher_request_set_crypt(subreq, req->src, req->dst,
928 req->nbytes, req->info);
929 err = is_encrypt ? crypto_skcipher_encrypt(subreq) :
930 crypto_skcipher_decrypt(subreq);
931 skcipher_request_zero(subreq);
932
933 return err;
934 }
935
spacc_ablk_setup(struct ablkcipher_request * req,unsigned alg_type,bool is_encrypt)936 static int spacc_ablk_setup(struct ablkcipher_request *req, unsigned alg_type,
937 bool is_encrypt)
938 {
939 struct crypto_alg *alg = req->base.tfm->__crt_alg;
940 struct spacc_engine *engine = to_spacc_alg(alg)->engine;
941 struct spacc_req *dev_req = ablkcipher_request_ctx(req);
942 unsigned long flags;
943 int err = -ENOMEM;
944
945 dev_req->req = &req->base;
946 dev_req->is_encrypt = is_encrypt;
947 dev_req->engine = engine;
948 dev_req->complete = spacc_ablk_complete;
949 dev_req->result = -EINPROGRESS;
950
951 if (unlikely(spacc_ablk_need_fallback(dev_req)))
952 return spacc_ablk_do_fallback(req, alg_type, is_encrypt);
953
954 /*
955 * Create the DDT's for the engine. If we share the same source and
956 * destination then we can optimize by reusing the DDT's.
957 */
958 if (req->src != req->dst) {
959 dev_req->src_ddt = spacc_sg_to_ddt(engine, req->src,
960 req->nbytes, DMA_TO_DEVICE, &dev_req->src_addr);
961 if (!dev_req->src_ddt)
962 goto out;
963
964 dev_req->dst_ddt = spacc_sg_to_ddt(engine, req->dst,
965 req->nbytes, DMA_FROM_DEVICE, &dev_req->dst_addr);
966 if (!dev_req->dst_ddt)
967 goto out_free_src;
968 } else {
969 dev_req->dst_ddt = spacc_sg_to_ddt(engine, req->dst,
970 req->nbytes, DMA_BIDIRECTIONAL, &dev_req->dst_addr);
971 if (!dev_req->dst_ddt)
972 goto out;
973
974 dev_req->src_ddt = NULL;
975 dev_req->src_addr = dev_req->dst_addr;
976 }
977
978 err = -EINPROGRESS;
979 spin_lock_irqsave(&engine->hw_lock, flags);
980 /*
981 * Check if the engine will accept the operation now. If it won't then
982 * we either stick it on the end of a pending list if we can backlog,
983 * or bailout with an error if not.
984 */
985 if (unlikely(spacc_fifo_cmd_full(engine)) ||
986 engine->in_flight + 1 > engine->fifo_sz) {
987 if (!(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
988 err = -EBUSY;
989 spin_unlock_irqrestore(&engine->hw_lock, flags);
990 goto out_free_ddts;
991 }
992 list_add_tail(&dev_req->list, &engine->pending);
993 } else {
994 list_add_tail(&dev_req->list, &engine->pending);
995 spacc_push(engine);
996 }
997 spin_unlock_irqrestore(&engine->hw_lock, flags);
998
999 goto out;
1000
1001 out_free_ddts:
1002 spacc_free_ddt(dev_req, dev_req->dst_ddt, dev_req->dst_addr, req->dst,
1003 req->nbytes, req->src == req->dst ?
1004 DMA_BIDIRECTIONAL : DMA_FROM_DEVICE);
1005 out_free_src:
1006 if (req->src != req->dst)
1007 spacc_free_ddt(dev_req, dev_req->src_ddt, dev_req->src_addr,
1008 req->src, req->nbytes, DMA_TO_DEVICE);
1009 out:
1010 return err;
1011 }
1012
spacc_ablk_cra_init(struct crypto_tfm * tfm)1013 static int spacc_ablk_cra_init(struct crypto_tfm *tfm)
1014 {
1015 struct spacc_ablk_ctx *ctx = crypto_tfm_ctx(tfm);
1016 struct crypto_alg *alg = tfm->__crt_alg;
1017 struct spacc_alg *spacc_alg = to_spacc_alg(alg);
1018 struct spacc_engine *engine = spacc_alg->engine;
1019
1020 ctx->generic.flags = spacc_alg->type;
1021 ctx->generic.engine = engine;
1022 if (alg->cra_flags & CRYPTO_ALG_NEED_FALLBACK) {
1023 ctx->sw_cipher = crypto_alloc_skcipher(
1024 alg->cra_name, 0, CRYPTO_ALG_ASYNC |
1025 CRYPTO_ALG_NEED_FALLBACK);
1026 if (IS_ERR(ctx->sw_cipher)) {
1027 dev_warn(engine->dev, "failed to allocate fallback for %s\n",
1028 alg->cra_name);
1029 return PTR_ERR(ctx->sw_cipher);
1030 }
1031 }
1032 ctx->generic.key_offs = spacc_alg->key_offs;
1033 ctx->generic.iv_offs = spacc_alg->iv_offs;
1034
1035 tfm->crt_ablkcipher.reqsize = sizeof(struct spacc_req);
1036
1037 return 0;
1038 }
1039
spacc_ablk_cra_exit(struct crypto_tfm * tfm)1040 static void spacc_ablk_cra_exit(struct crypto_tfm *tfm)
1041 {
1042 struct spacc_ablk_ctx *ctx = crypto_tfm_ctx(tfm);
1043
1044 crypto_free_skcipher(ctx->sw_cipher);
1045 }
1046
spacc_ablk_encrypt(struct ablkcipher_request * req)1047 static int spacc_ablk_encrypt(struct ablkcipher_request *req)
1048 {
1049 struct crypto_ablkcipher *cipher = crypto_ablkcipher_reqtfm(req);
1050 struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
1051 struct spacc_alg *alg = to_spacc_alg(tfm->__crt_alg);
1052
1053 return spacc_ablk_setup(req, alg->type, 1);
1054 }
1055
spacc_ablk_decrypt(struct ablkcipher_request * req)1056 static int spacc_ablk_decrypt(struct ablkcipher_request *req)
1057 {
1058 struct crypto_ablkcipher *cipher = crypto_ablkcipher_reqtfm(req);
1059 struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
1060 struct spacc_alg *alg = to_spacc_alg(tfm->__crt_alg);
1061
1062 return spacc_ablk_setup(req, alg->type, 0);
1063 }
1064
spacc_fifo_stat_empty(struct spacc_engine * engine)1065 static inline int spacc_fifo_stat_empty(struct spacc_engine *engine)
1066 {
1067 return readl(engine->regs + SPA_FIFO_STAT_REG_OFFSET) &
1068 SPA_FIFO_STAT_EMPTY;
1069 }
1070
spacc_process_done(struct spacc_engine * engine)1071 static void spacc_process_done(struct spacc_engine *engine)
1072 {
1073 struct spacc_req *req;
1074 unsigned long flags;
1075
1076 spin_lock_irqsave(&engine->hw_lock, flags);
1077
1078 while (!spacc_fifo_stat_empty(engine)) {
1079 req = list_first_entry(&engine->in_progress, struct spacc_req,
1080 list);
1081 list_move_tail(&req->list, &engine->completed);
1082 --engine->in_flight;
1083
1084 /* POP the status register. */
1085 writel(~0, engine->regs + SPA_STAT_POP_REG_OFFSET);
1086 req->result = (readl(engine->regs + SPA_STATUS_REG_OFFSET) &
1087 SPA_STATUS_RES_CODE_MASK) >> SPA_STATUS_RES_CODE_OFFSET;
1088
1089 /*
1090 * Convert the SPAcc error status into the standard POSIX error
1091 * codes.
1092 */
1093 if (unlikely(req->result)) {
1094 switch (req->result) {
1095 case SPA_STATUS_ICV_FAIL:
1096 req->result = -EBADMSG;
1097 break;
1098
1099 case SPA_STATUS_MEMORY_ERROR:
1100 dev_warn(engine->dev,
1101 "memory error triggered\n");
1102 req->result = -EFAULT;
1103 break;
1104
1105 case SPA_STATUS_BLOCK_ERROR:
1106 dev_warn(engine->dev,
1107 "block error triggered\n");
1108 req->result = -EIO;
1109 break;
1110 }
1111 }
1112 }
1113
1114 tasklet_schedule(&engine->complete);
1115
1116 spin_unlock_irqrestore(&engine->hw_lock, flags);
1117 }
1118
spacc_spacc_irq(int irq,void * dev)1119 static irqreturn_t spacc_spacc_irq(int irq, void *dev)
1120 {
1121 struct spacc_engine *engine = (struct spacc_engine *)dev;
1122 u32 spacc_irq_stat = readl(engine->regs + SPA_IRQ_STAT_REG_OFFSET);
1123
1124 writel(spacc_irq_stat, engine->regs + SPA_IRQ_STAT_REG_OFFSET);
1125 spacc_process_done(engine);
1126
1127 return IRQ_HANDLED;
1128 }
1129
spacc_packet_timeout(struct timer_list * t)1130 static void spacc_packet_timeout(struct timer_list *t)
1131 {
1132 struct spacc_engine *engine = from_timer(engine, t, packet_timeout);
1133
1134 spacc_process_done(engine);
1135 }
1136
spacc_req_submit(struct spacc_req * req)1137 static int spacc_req_submit(struct spacc_req *req)
1138 {
1139 struct crypto_alg *alg = req->req->tfm->__crt_alg;
1140
1141 if (CRYPTO_ALG_TYPE_AEAD == (CRYPTO_ALG_TYPE_MASK & alg->cra_flags))
1142 return spacc_aead_submit(req);
1143 else
1144 return spacc_ablk_submit(req);
1145 }
1146
spacc_spacc_complete(unsigned long data)1147 static void spacc_spacc_complete(unsigned long data)
1148 {
1149 struct spacc_engine *engine = (struct spacc_engine *)data;
1150 struct spacc_req *req, *tmp;
1151 unsigned long flags;
1152 LIST_HEAD(completed);
1153
1154 spin_lock_irqsave(&engine->hw_lock, flags);
1155
1156 list_splice_init(&engine->completed, &completed);
1157 spacc_push(engine);
1158 if (engine->in_flight)
1159 mod_timer(&engine->packet_timeout, jiffies + PACKET_TIMEOUT);
1160
1161 spin_unlock_irqrestore(&engine->hw_lock, flags);
1162
1163 list_for_each_entry_safe(req, tmp, &completed, list) {
1164 list_del(&req->list);
1165 req->complete(req);
1166 }
1167 }
1168
1169 #ifdef CONFIG_PM
spacc_suspend(struct device * dev)1170 static int spacc_suspend(struct device *dev)
1171 {
1172 struct spacc_engine *engine = dev_get_drvdata(dev);
1173
1174 /*
1175 * We only support standby mode. All we have to do is gate the clock to
1176 * the spacc. The hardware will preserve state until we turn it back
1177 * on again.
1178 */
1179 clk_disable(engine->clk);
1180
1181 return 0;
1182 }
1183
spacc_resume(struct device * dev)1184 static int spacc_resume(struct device *dev)
1185 {
1186 struct spacc_engine *engine = dev_get_drvdata(dev);
1187
1188 return clk_enable(engine->clk);
1189 }
1190
1191 static const struct dev_pm_ops spacc_pm_ops = {
1192 .suspend = spacc_suspend,
1193 .resume = spacc_resume,
1194 };
1195 #endif /* CONFIG_PM */
1196
spacc_dev_to_engine(struct device * dev)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
spacc_stat_irq_thresh_show(struct device * dev,struct device_attribute * attr,char * buf)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
spacc_stat_irq_thresh_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t len)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
spacc_probe(struct platform_device * pdev)1619 static int spacc_probe(struct platform_device *pdev)
1620 {
1621 int i, err, ret;
1622 struct resource *mem, *irq;
1623 struct device_node *np = pdev->dev.of_node;
1624 struct spacc_engine *engine = devm_kzalloc(&pdev->dev, sizeof(*engine),
1625 GFP_KERNEL);
1626 if (!engine)
1627 return -ENOMEM;
1628
1629 if (of_device_is_compatible(np, "picochip,spacc-ipsec")) {
1630 engine->max_ctxs = SPACC_CRYPTO_IPSEC_MAX_CTXS;
1631 engine->cipher_pg_sz = SPACC_CRYPTO_IPSEC_CIPHER_PG_SZ;
1632 engine->hash_pg_sz = SPACC_CRYPTO_IPSEC_HASH_PG_SZ;
1633 engine->fifo_sz = SPACC_CRYPTO_IPSEC_FIFO_SZ;
1634 engine->algs = ipsec_engine_algs;
1635 engine->num_algs = ARRAY_SIZE(ipsec_engine_algs);
1636 engine->aeads = ipsec_engine_aeads;
1637 engine->num_aeads = ARRAY_SIZE(ipsec_engine_aeads);
1638 } else if (of_device_is_compatible(np, "picochip,spacc-l2")) {
1639 engine->max_ctxs = SPACC_CRYPTO_L2_MAX_CTXS;
1640 engine->cipher_pg_sz = SPACC_CRYPTO_L2_CIPHER_PG_SZ;
1641 engine->hash_pg_sz = SPACC_CRYPTO_L2_HASH_PG_SZ;
1642 engine->fifo_sz = SPACC_CRYPTO_L2_FIFO_SZ;
1643 engine->algs = l2_engine_algs;
1644 engine->num_algs = ARRAY_SIZE(l2_engine_algs);
1645 } else {
1646 return -EINVAL;
1647 }
1648
1649 engine->name = dev_name(&pdev->dev);
1650
1651 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1652 engine->regs = devm_ioremap_resource(&pdev->dev, mem);
1653 if (IS_ERR(engine->regs))
1654 return PTR_ERR(engine->regs);
1655
1656 irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1657 if (!irq) {
1658 dev_err(&pdev->dev, "no memory/irq resource for engine\n");
1659 return -ENXIO;
1660 }
1661
1662 if (devm_request_irq(&pdev->dev, irq->start, spacc_spacc_irq, 0,
1663 engine->name, engine)) {
1664 dev_err(engine->dev, "failed to request IRQ\n");
1665 return -EBUSY;
1666 }
1667
1668 engine->dev = &pdev->dev;
1669 engine->cipher_ctx_base = engine->regs + SPA_CIPH_KEY_BASE_REG_OFFSET;
1670 engine->hash_key_base = engine->regs + SPA_HASH_KEY_BASE_REG_OFFSET;
1671
1672 engine->req_pool = dmam_pool_create(engine->name, engine->dev,
1673 MAX_DDT_LEN * sizeof(struct spacc_ddt), 8, SZ_64K);
1674 if (!engine->req_pool)
1675 return -ENOMEM;
1676
1677 spin_lock_init(&engine->hw_lock);
1678
1679 engine->clk = clk_get(&pdev->dev, "ref");
1680 if (IS_ERR(engine->clk)) {
1681 dev_info(&pdev->dev, "clk unavailable\n");
1682 return PTR_ERR(engine->clk);
1683 }
1684
1685 if (clk_prepare_enable(engine->clk)) {
1686 dev_info(&pdev->dev, "unable to prepare/enable clk\n");
1687 ret = -EIO;
1688 goto err_clk_put;
1689 }
1690
1691 ret = device_create_file(&pdev->dev, &dev_attr_stat_irq_thresh);
1692 if (ret)
1693 goto err_clk_disable;
1694
1695
1696 /*
1697 * Use an IRQ threshold of 50% as a default. This seems to be a
1698 * reasonable trade off of latency against throughput but can be
1699 * changed at runtime.
1700 */
1701 engine->stat_irq_thresh = (engine->fifo_sz / 2);
1702
1703 /*
1704 * Configure the interrupts. We only use the STAT_CNT interrupt as we
1705 * only submit a new packet for processing when we complete another in
1706 * the queue. This minimizes time spent in the interrupt handler.
1707 */
1708 writel(engine->stat_irq_thresh << SPA_IRQ_CTRL_STAT_CNT_OFFSET,
1709 engine->regs + SPA_IRQ_CTRL_REG_OFFSET);
1710 writel(SPA_IRQ_EN_STAT_EN | SPA_IRQ_EN_GLBL_EN,
1711 engine->regs + SPA_IRQ_EN_REG_OFFSET);
1712
1713 timer_setup(&engine->packet_timeout, spacc_packet_timeout, 0);
1714
1715 INIT_LIST_HEAD(&engine->pending);
1716 INIT_LIST_HEAD(&engine->completed);
1717 INIT_LIST_HEAD(&engine->in_progress);
1718 engine->in_flight = 0;
1719 tasklet_init(&engine->complete, spacc_spacc_complete,
1720 (unsigned long)engine);
1721
1722 platform_set_drvdata(pdev, engine);
1723
1724 ret = -EINVAL;
1725 INIT_LIST_HEAD(&engine->registered_algs);
1726 for (i = 0; i < engine->num_algs; ++i) {
1727 engine->algs[i].engine = engine;
1728 err = crypto_register_alg(&engine->algs[i].alg);
1729 if (!err) {
1730 list_add_tail(&engine->algs[i].entry,
1731 &engine->registered_algs);
1732 ret = 0;
1733 }
1734 if (err)
1735 dev_err(engine->dev, "failed to register alg \"%s\"\n",
1736 engine->algs[i].alg.cra_name);
1737 else
1738 dev_dbg(engine->dev, "registered alg \"%s\"\n",
1739 engine->algs[i].alg.cra_name);
1740 }
1741
1742 INIT_LIST_HEAD(&engine->registered_aeads);
1743 for (i = 0; i < engine->num_aeads; ++i) {
1744 engine->aeads[i].engine = engine;
1745 err = crypto_register_aead(&engine->aeads[i].alg);
1746 if (!err) {
1747 list_add_tail(&engine->aeads[i].entry,
1748 &engine->registered_aeads);
1749 ret = 0;
1750 }
1751 if (err)
1752 dev_err(engine->dev, "failed to register alg \"%s\"\n",
1753 engine->aeads[i].alg.base.cra_name);
1754 else
1755 dev_dbg(engine->dev, "registered alg \"%s\"\n",
1756 engine->aeads[i].alg.base.cra_name);
1757 }
1758
1759 if (!ret)
1760 return 0;
1761
1762 del_timer_sync(&engine->packet_timeout);
1763 device_remove_file(&pdev->dev, &dev_attr_stat_irq_thresh);
1764 err_clk_disable:
1765 clk_disable_unprepare(engine->clk);
1766 err_clk_put:
1767 clk_put(engine->clk);
1768
1769 return ret;
1770 }
1771
spacc_remove(struct platform_device * pdev)1772 static int spacc_remove(struct platform_device *pdev)
1773 {
1774 struct spacc_aead *aead, *an;
1775 struct spacc_alg *alg, *next;
1776 struct spacc_engine *engine = platform_get_drvdata(pdev);
1777
1778 del_timer_sync(&engine->packet_timeout);
1779 device_remove_file(&pdev->dev, &dev_attr_stat_irq_thresh);
1780
1781 list_for_each_entry_safe(aead, an, &engine->registered_aeads, entry) {
1782 list_del(&aead->entry);
1783 crypto_unregister_aead(&aead->alg);
1784 }
1785
1786 list_for_each_entry_safe(alg, next, &engine->registered_algs, entry) {
1787 list_del(&alg->entry);
1788 crypto_unregister_alg(&alg->alg);
1789 }
1790
1791 clk_disable_unprepare(engine->clk);
1792 clk_put(engine->clk);
1793
1794 return 0;
1795 }
1796
1797 static struct platform_driver spacc_driver = {
1798 .probe = spacc_probe,
1799 .remove = spacc_remove,
1800 .driver = {
1801 .name = "picochip,spacc",
1802 #ifdef CONFIG_PM
1803 .pm = &spacc_pm_ops,
1804 #endif /* CONFIG_PM */
1805 .of_match_table = of_match_ptr(spacc_of_id_table),
1806 },
1807 };
1808
1809 module_platform_driver(spacc_driver);
1810
1811 MODULE_LICENSE("GPL");
1812 MODULE_AUTHOR("Jamie Iles");
1813
