1 /*
2 * Copyright (c) 2010-2011 Picochip Ltd., Jamie Iles
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 */
18 #include <crypto/internal/aead.h>
19 #include <crypto/aes.h>
20 #include <crypto/algapi.h>
21 #include <crypto/authenc.h>
22 #include <crypto/des.h>
23 #include <crypto/md5.h>
24 #include <crypto/sha.h>
25 #include <crypto/internal/skcipher.h>
26 #include <linux/clk.h>
27 #include <linux/crypto.h>
28 #include <linux/delay.h>
29 #include <linux/dma-mapping.h>
30 #include <linux/dmapool.h>
31 #include <linux/err.h>
32 #include <linux/init.h>
33 #include <linux/interrupt.h>
34 #include <linux/io.h>
35 #include <linux/list.h>
36 #include <linux/module.h>
37 #include <linux/of.h>
38 #include <linux/platform_device.h>
39 #include <linux/pm.h>
40 #include <linux/rtnetlink.h>
41 #include <linux/scatterlist.h>
42 #include <linux/sched.h>
43 #include <linux/sizes.h>
44 #include <linux/slab.h>
45 #include <linux/timer.h>
46
47 #include "picoxcell_crypto_regs.h"
48
49 /*
50 * The threshold for the number of entries in the CMD FIFO available before
51 * the CMD0_CNT interrupt is raised. Increasing this value will reduce the
52 * number of interrupts raised to the CPU.
53 */
54 #define CMD0_IRQ_THRESHOLD 1
55
56 /*
57 * The timeout period (in jiffies) for a PDU. When the the number of PDUs in
58 * flight is greater than the STAT_IRQ_THRESHOLD or 0 the timer is disabled.
59 * When there are packets in flight but lower than the threshold, we enable
60 * the timer and at expiry, attempt to remove any processed packets from the
61 * queue and if there are still packets left, schedule the timer again.
62 */
63 #define PACKET_TIMEOUT 1
64
65 /* The priority to register each algorithm with. */
66 #define SPACC_CRYPTO_ALG_PRIORITY 10000
67
68 #define SPACC_CRYPTO_KASUMI_F8_KEY_LEN 16
69 #define SPACC_CRYPTO_IPSEC_CIPHER_PG_SZ 64
70 #define SPACC_CRYPTO_IPSEC_HASH_PG_SZ 64
71 #define SPACC_CRYPTO_IPSEC_MAX_CTXS 32
72 #define SPACC_CRYPTO_IPSEC_FIFO_SZ 32
73 #define SPACC_CRYPTO_L2_CIPHER_PG_SZ 64
74 #define SPACC_CRYPTO_L2_HASH_PG_SZ 64
75 #define SPACC_CRYPTO_L2_MAX_CTXS 128
76 #define SPACC_CRYPTO_L2_FIFO_SZ 128
77
78 #define MAX_DDT_LEN 16
79
80 /* DDT format. This must match the hardware DDT format exactly. */
81 struct spacc_ddt {
82 dma_addr_t p;
83 u32 len;
84 };
85
86 /*
87 * Asynchronous crypto request structure.
88 *
89 * This structure defines a request that is either queued for processing or
90 * being processed.
91 */
92 struct spacc_req {
93 struct list_head list;
94 struct spacc_engine *engine;
95 struct crypto_async_request *req;
96 int result;
97 bool is_encrypt;
98 unsigned ctx_id;
99 dma_addr_t src_addr, dst_addr;
100 struct spacc_ddt *src_ddt, *dst_ddt;
101 void (*complete)(struct spacc_req *req);
102 };
103
104 struct spacc_aead {
105 unsigned long ctrl_default;
106 unsigned long type;
107 struct aead_alg alg;
108 struct spacc_engine *engine;
109 struct list_head entry;
110 int key_offs;
111 int iv_offs;
112 };
113
114 struct spacc_engine {
115 void __iomem *regs;
116 struct list_head pending;
117 int next_ctx;
118 spinlock_t hw_lock;
119 int in_flight;
120 struct list_head completed;
121 struct list_head in_progress;
122 struct tasklet_struct complete;
123 unsigned long fifo_sz;
124 void __iomem *cipher_ctx_base;
125 void __iomem *hash_key_base;
126 struct spacc_alg *algs;
127 unsigned num_algs;
128 struct list_head registered_algs;
129 struct spacc_aead *aeads;
130 unsigned num_aeads;
131 struct list_head registered_aeads;
132 size_t cipher_pg_sz;
133 size_t hash_pg_sz;
134 const char *name;
135 struct clk *clk;
136 struct device *dev;
137 unsigned max_ctxs;
138 struct timer_list packet_timeout;
139 unsigned stat_irq_thresh;
140 struct dma_pool *req_pool;
141 };
142
143 /* Algorithm type mask. */
144 #define SPACC_CRYPTO_ALG_MASK 0x7
145
146 /* SPACC definition of a crypto algorithm. */
147 struct spacc_alg {
148 unsigned long ctrl_default;
149 unsigned long type;
150 struct crypto_alg alg;
151 struct spacc_engine *engine;
152 struct list_head entry;
153 int key_offs;
154 int iv_offs;
155 };
156
157 /* Generic context structure for any algorithm type. */
158 struct spacc_generic_ctx {
159 struct spacc_engine *engine;
160 int flags;
161 int key_offs;
162 int iv_offs;
163 };
164
165 /* Block cipher context. */
166 struct spacc_ablk_ctx {
167 struct spacc_generic_ctx generic;
168 u8 key[AES_MAX_KEY_SIZE];
169 u8 key_len;
170 /*
171 * The fallback cipher. If the operation can't be done in hardware,
172 * fallback to a software version.
173 */
174 struct crypto_ablkcipher *sw_cipher;
175 };
176
177 /* AEAD cipher context. */
178 struct spacc_aead_ctx {
179 struct spacc_generic_ctx generic;
180 u8 cipher_key[AES_MAX_KEY_SIZE];
181 u8 hash_ctx[SPACC_CRYPTO_IPSEC_HASH_PG_SZ];
182 u8 cipher_key_len;
183 u8 hash_key_len;
184 struct crypto_aead *sw_cipher;
185 };
186
187 static int spacc_ablk_submit(struct spacc_req *req);
188
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
275 /* Count the number of scatterlist entries in a scatterlist. */
sg_count(struct scatterlist * sg_list,int nbytes)276 static inline int sg_count(struct scatterlist *sg_list, int nbytes)
277 {
278 return sg_nents_for_len(sg_list, nbytes);
279 }
280
ddt_set(struct spacc_ddt * ddt,dma_addr_t phys,size_t len)281 static inline void ddt_set(struct spacc_ddt *ddt, dma_addr_t phys, size_t len)
282 {
283 ddt->p = phys;
284 ddt->len = len;
285 }
286
287 /*
288 * Take a crypto request and scatterlists for the data and turn them into DDTs
289 * for passing to the crypto engines. This also DMA maps the data so that the
290 * crypto engines can DMA to/from them.
291 */
spacc_sg_to_ddt(struct spacc_engine * engine,struct scatterlist * payload,unsigned nbytes,enum dma_data_direction dir,dma_addr_t * ddt_phys)292 static struct spacc_ddt *spacc_sg_to_ddt(struct spacc_engine *engine,
293 struct scatterlist *payload,
294 unsigned nbytes,
295 enum dma_data_direction dir,
296 dma_addr_t *ddt_phys)
297 {
298 unsigned nents, mapped_ents;
299 struct scatterlist *cur;
300 struct spacc_ddt *ddt;
301 int i;
302
303 nents = sg_count(payload, nbytes);
304 mapped_ents = dma_map_sg(engine->dev, payload, nents, dir);
305
306 if (mapped_ents + 1 > MAX_DDT_LEN)
307 goto out;
308
309 ddt = dma_pool_alloc(engine->req_pool, GFP_ATOMIC, ddt_phys);
310 if (!ddt)
311 goto out;
312
313 for_each_sg(payload, cur, mapped_ents, i)
314 ddt_set(&ddt[i], sg_dma_address(cur), sg_dma_len(cur));
315 ddt_set(&ddt[mapped_ents], 0, 0);
316
317 return ddt;
318
319 out:
320 dma_unmap_sg(engine->dev, payload, nents, dir);
321 return NULL;
322 }
323
spacc_aead_make_ddts(struct aead_request * areq)324 static int spacc_aead_make_ddts(struct aead_request *areq)
325 {
326 struct crypto_aead *aead = crypto_aead_reqtfm(areq);
327 struct spacc_req *req = aead_request_ctx(areq);
328 struct spacc_engine *engine = req->engine;
329 struct spacc_ddt *src_ddt, *dst_ddt;
330 unsigned total;
331 unsigned int src_nents, dst_nents;
332 struct scatterlist *cur;
333 int i, dst_ents, src_ents;
334
335 total = areq->assoclen + areq->cryptlen;
336 if (req->is_encrypt)
337 total += crypto_aead_authsize(aead);
338
339 src_nents = sg_count(areq->src, total);
340 if (src_nents + 1 > MAX_DDT_LEN)
341 return -E2BIG;
342
343 dst_nents = 0;
344 if (areq->src != areq->dst) {
345 dst_nents = sg_count(areq->dst, total);
346 if (src_nents + 1 > MAX_DDT_LEN)
347 return -E2BIG;
348 }
349
350 src_ddt = dma_pool_alloc(engine->req_pool, GFP_ATOMIC, &req->src_addr);
351 if (!src_ddt)
352 goto err;
353
354 dst_ddt = dma_pool_alloc(engine->req_pool, GFP_ATOMIC, &req->dst_addr);
355 if (!dst_ddt)
356 goto err_free_src;
357
358 req->src_ddt = src_ddt;
359 req->dst_ddt = dst_ddt;
360
361 if (dst_nents) {
362 src_ents = dma_map_sg(engine->dev, areq->src, src_nents,
363 DMA_TO_DEVICE);
364 if (!src_ents)
365 goto err_free_dst;
366
367 dst_ents = dma_map_sg(engine->dev, areq->dst, dst_nents,
368 DMA_FROM_DEVICE);
369
370 if (!dst_ents) {
371 dma_unmap_sg(engine->dev, areq->src, src_nents,
372 DMA_TO_DEVICE);
373 goto err_free_dst;
374 }
375 } else {
376 src_ents = dma_map_sg(engine->dev, areq->src, src_nents,
377 DMA_BIDIRECTIONAL);
378 if (!src_ents)
379 goto err_free_dst;
380 dst_ents = src_ents;
381 }
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
390 /* For decryption we need to skip the associated data. */
391 total = req->is_encrypt ? 0 : areq->assoclen;
392 for_each_sg(areq->dst, cur, dst_ents, i) {
393 unsigned len = sg_dma_len(cur);
394
395 if (len <= total) {
396 total -= len;
397 continue;
398 }
399
400 ddt_set(dst_ddt++, sg_dma_address(cur) + total, len - total);
401 }
402
403 ddt_set(src_ddt, 0, 0);
404 ddt_set(dst_ddt, 0, 0);
405
406 return 0;
407
408 err_free_dst:
409 dma_pool_free(engine->req_pool, dst_ddt, req->dst_addr);
410 err_free_src:
411 dma_pool_free(engine->req_pool, src_ddt, req->src_addr);
412 err:
413 return -ENOMEM;
414 }
415
spacc_aead_free_ddts(struct spacc_req * req)416 static void spacc_aead_free_ddts(struct spacc_req *req)
417 {
418 struct aead_request *areq = container_of(req->req, struct aead_request,
419 base);
420 struct crypto_aead *aead = crypto_aead_reqtfm(areq);
421 unsigned total = areq->assoclen + areq->cryptlen +
422 (req->is_encrypt ? crypto_aead_authsize(aead) : 0);
423 struct spacc_aead_ctx *aead_ctx = crypto_aead_ctx(aead);
424 struct spacc_engine *engine = aead_ctx->generic.engine;
425 unsigned nents = sg_count(areq->src, total);
426
427 if (areq->src != areq->dst) {
428 dma_unmap_sg(engine->dev, areq->src, nents, DMA_TO_DEVICE);
429 dma_unmap_sg(engine->dev, areq->dst,
430 sg_count(areq->dst, total),
431 DMA_FROM_DEVICE);
432 } else
433 dma_unmap_sg(engine->dev, areq->src, nents, DMA_BIDIRECTIONAL);
434
435 dma_pool_free(engine->req_pool, req->src_ddt, req->src_addr);
436 dma_pool_free(engine->req_pool, req->dst_ddt, req->dst_addr);
437 }
438
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)439 static void spacc_free_ddt(struct spacc_req *req, struct spacc_ddt *ddt,
440 dma_addr_t ddt_addr, struct scatterlist *payload,
441 unsigned nbytes, enum dma_data_direction dir)
442 {
443 unsigned nents = sg_count(payload, nbytes);
444
445 dma_unmap_sg(req->engine->dev, payload, nents, dir);
446 dma_pool_free(req->engine->req_pool, ddt, ddt_addr);
447 }
448
spacc_aead_setkey(struct crypto_aead * tfm,const u8 * key,unsigned int keylen)449 static int spacc_aead_setkey(struct crypto_aead *tfm, const u8 *key,
450 unsigned int keylen)
451 {
452 struct spacc_aead_ctx *ctx = crypto_aead_ctx(tfm);
453 struct crypto_authenc_keys keys;
454 int err;
455
456 crypto_aead_clear_flags(ctx->sw_cipher, CRYPTO_TFM_REQ_MASK);
457 crypto_aead_set_flags(ctx->sw_cipher, crypto_aead_get_flags(tfm) &
458 CRYPTO_TFM_REQ_MASK);
459 err = crypto_aead_setkey(ctx->sw_cipher, key, keylen);
460 crypto_aead_clear_flags(tfm, CRYPTO_TFM_RES_MASK);
461 crypto_aead_set_flags(tfm, crypto_aead_get_flags(ctx->sw_cipher) &
462 CRYPTO_TFM_RES_MASK);
463 if (err)
464 return err;
465
466 if (crypto_authenc_extractkeys(&keys, key, keylen) != 0)
467 goto badkey;
468
469 if (keys.enckeylen > AES_MAX_KEY_SIZE)
470 goto badkey;
471
472 if (keys.authkeylen > sizeof(ctx->hash_ctx))
473 goto badkey;
474
475 memcpy(ctx->cipher_key, keys.enckey, keys.enckeylen);
476 ctx->cipher_key_len = keys.enckeylen;
477
478 memcpy(ctx->hash_ctx, keys.authkey, keys.authkeylen);
479 ctx->hash_key_len = keys.authkeylen;
480
481 return 0;
482
483 badkey:
484 crypto_aead_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
485 return -EINVAL;
486 }
487
spacc_aead_setauthsize(struct crypto_aead * tfm,unsigned int authsize)488 static int spacc_aead_setauthsize(struct crypto_aead *tfm,
489 unsigned int authsize)
490 {
491 struct spacc_aead_ctx *ctx = crypto_tfm_ctx(crypto_aead_tfm(tfm));
492
493 return crypto_aead_setauthsize(ctx->sw_cipher, authsize);
494 }
495
496 /*
497 * Check if an AEAD request requires a fallback operation. Some requests can't
498 * be completed in hardware because the hardware may not support certain key
499 * sizes. In these cases we need to complete the request in software.
500 */
spacc_aead_need_fallback(struct aead_request * aead_req)501 static int spacc_aead_need_fallback(struct aead_request *aead_req)
502 {
503 struct crypto_aead *aead = crypto_aead_reqtfm(aead_req);
504 struct aead_alg *alg = crypto_aead_alg(aead);
505 struct spacc_aead *spacc_alg = to_spacc_aead(alg);
506 struct spacc_aead_ctx *ctx = crypto_aead_ctx(aead);
507
508 /*
509 * If we have a non-supported key-length, then we need to do a
510 * software fallback.
511 */
512 if ((spacc_alg->ctrl_default & SPACC_CRYPTO_ALG_MASK) ==
513 SPA_CTRL_CIPH_ALG_AES &&
514 ctx->cipher_key_len != AES_KEYSIZE_128 &&
515 ctx->cipher_key_len != AES_KEYSIZE_256)
516 return 1;
517
518 return 0;
519 }
520
spacc_aead_do_fallback(struct aead_request * req,unsigned alg_type,bool is_encrypt)521 static int spacc_aead_do_fallback(struct aead_request *req, unsigned alg_type,
522 bool is_encrypt)
523 {
524 struct crypto_tfm *old_tfm = crypto_aead_tfm(crypto_aead_reqtfm(req));
525 struct spacc_aead_ctx *ctx = crypto_tfm_ctx(old_tfm);
526 struct aead_request *subreq = aead_request_ctx(req);
527
528 aead_request_set_tfm(subreq, ctx->sw_cipher);
529 aead_request_set_callback(subreq, req->base.flags,
530 req->base.complete, req->base.data);
531 aead_request_set_crypt(subreq, req->src, req->dst, req->cryptlen,
532 req->iv);
533 aead_request_set_ad(subreq, req->assoclen);
534
535 return is_encrypt ? crypto_aead_encrypt(subreq) :
536 crypto_aead_decrypt(subreq);
537 }
538
spacc_aead_complete(struct spacc_req * req)539 static void spacc_aead_complete(struct spacc_req *req)
540 {
541 spacc_aead_free_ddts(req);
542 req->req->complete(req->req, req->result);
543 }
544
spacc_aead_submit(struct spacc_req * req)545 static int spacc_aead_submit(struct spacc_req *req)
546 {
547 struct aead_request *aead_req =
548 container_of(req->req, struct aead_request, base);
549 struct crypto_aead *aead = crypto_aead_reqtfm(aead_req);
550 unsigned int authsize = crypto_aead_authsize(aead);
551 struct spacc_aead_ctx *ctx = crypto_aead_ctx(aead);
552 struct aead_alg *alg = crypto_aead_alg(aead);
553 struct spacc_aead *spacc_alg = to_spacc_aead(alg);
554 struct spacc_engine *engine = ctx->generic.engine;
555 u32 ctrl, proc_len, assoc_len;
556
557 req->result = -EINPROGRESS;
558 req->ctx_id = spacc_load_ctx(&ctx->generic, ctx->cipher_key,
559 ctx->cipher_key_len, aead_req->iv, crypto_aead_ivsize(aead),
560 ctx->hash_ctx, ctx->hash_key_len);
561
562 /* Set the source and destination DDT pointers. */
563 writel(req->src_addr, engine->regs + SPA_SRC_PTR_REG_OFFSET);
564 writel(req->dst_addr, engine->regs + SPA_DST_PTR_REG_OFFSET);
565 writel(0, engine->regs + SPA_OFFSET_REG_OFFSET);
566
567 assoc_len = aead_req->assoclen;
568 proc_len = aead_req->cryptlen + assoc_len;
569
570 /*
571 * If we are decrypting, we need to take the length of the ICV out of
572 * the processing length.
573 */
574 if (!req->is_encrypt)
575 proc_len -= authsize;
576
577 writel(proc_len, engine->regs + SPA_PROC_LEN_REG_OFFSET);
578 writel(assoc_len, engine->regs + SPA_AAD_LEN_REG_OFFSET);
579 writel(authsize, engine->regs + SPA_ICV_LEN_REG_OFFSET);
580 writel(0, engine->regs + SPA_ICV_OFFSET_REG_OFFSET);
581 writel(0, engine->regs + SPA_AUX_INFO_REG_OFFSET);
582
583 ctrl = spacc_alg->ctrl_default | (req->ctx_id << SPA_CTRL_CTX_IDX) |
584 (1 << SPA_CTRL_ICV_APPEND);
585 if (req->is_encrypt)
586 ctrl |= (1 << SPA_CTRL_ENCRYPT_IDX) | (1 << SPA_CTRL_AAD_COPY);
587 else
588 ctrl |= (1 << SPA_CTRL_KEY_EXP);
589
590 mod_timer(&engine->packet_timeout, jiffies + PACKET_TIMEOUT);
591
592 writel(ctrl, engine->regs + SPA_CTRL_REG_OFFSET);
593
594 return -EINPROGRESS;
595 }
596
597 static int spacc_req_submit(struct spacc_req *req);
598
spacc_push(struct spacc_engine * engine)599 static void spacc_push(struct spacc_engine *engine)
600 {
601 struct spacc_req *req;
602
603 while (!list_empty(&engine->pending) &&
604 engine->in_flight + 1 <= engine->fifo_sz) {
605
606 ++engine->in_flight;
607 req = list_first_entry(&engine->pending, struct spacc_req,
608 list);
609 list_move_tail(&req->list, &engine->in_progress);
610
611 req->result = spacc_req_submit(req);
612 }
613 }
614
615 /*
616 * Setup an AEAD request for processing. This will configure the engine, load
617 * the context and then start the packet processing.
618 */
spacc_aead_setup(struct aead_request * req,unsigned alg_type,bool is_encrypt)619 static int spacc_aead_setup(struct aead_request *req,
620 unsigned alg_type, bool is_encrypt)
621 {
622 struct crypto_aead *aead = crypto_aead_reqtfm(req);
623 struct aead_alg *alg = crypto_aead_alg(aead);
624 struct spacc_engine *engine = to_spacc_aead(alg)->engine;
625 struct spacc_req *dev_req = aead_request_ctx(req);
626 int err;
627 unsigned long flags;
628
629 dev_req->req = &req->base;
630 dev_req->is_encrypt = is_encrypt;
631 dev_req->result = -EBUSY;
632 dev_req->engine = engine;
633 dev_req->complete = spacc_aead_complete;
634
635 if (unlikely(spacc_aead_need_fallback(req) ||
636 ((err = spacc_aead_make_ddts(req)) == -E2BIG)))
637 return spacc_aead_do_fallback(req, alg_type, is_encrypt);
638
639 if (err)
640 goto out;
641
642 err = -EINPROGRESS;
643 spin_lock_irqsave(&engine->hw_lock, flags);
644 if (unlikely(spacc_fifo_cmd_full(engine)) ||
645 engine->in_flight + 1 > engine->fifo_sz) {
646 if (!(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
647 err = -EBUSY;
648 spin_unlock_irqrestore(&engine->hw_lock, flags);
649 goto out_free_ddts;
650 }
651 list_add_tail(&dev_req->list, &engine->pending);
652 } else {
653 list_add_tail(&dev_req->list, &engine->pending);
654 spacc_push(engine);
655 }
656 spin_unlock_irqrestore(&engine->hw_lock, flags);
657
658 goto out;
659
660 out_free_ddts:
661 spacc_aead_free_ddts(dev_req);
662 out:
663 return err;
664 }
665
spacc_aead_encrypt(struct aead_request * req)666 static int spacc_aead_encrypt(struct aead_request *req)
667 {
668 struct crypto_aead *aead = crypto_aead_reqtfm(req);
669 struct spacc_aead *alg = to_spacc_aead(crypto_aead_alg(aead));
670
671 return spacc_aead_setup(req, alg->type, 1);
672 }
673
spacc_aead_decrypt(struct aead_request * req)674 static int spacc_aead_decrypt(struct aead_request *req)
675 {
676 struct crypto_aead *aead = crypto_aead_reqtfm(req);
677 struct spacc_aead *alg = to_spacc_aead(crypto_aead_alg(aead));
678
679 return spacc_aead_setup(req, alg->type, 0);
680 }
681
682 /*
683 * Initialise a new AEAD context. This is responsible for allocating the
684 * fallback cipher and initialising the context.
685 */
spacc_aead_cra_init(struct crypto_aead * tfm)686 static int spacc_aead_cra_init(struct crypto_aead *tfm)
687 {
688 struct spacc_aead_ctx *ctx = crypto_aead_ctx(tfm);
689 struct aead_alg *alg = crypto_aead_alg(tfm);
690 struct spacc_aead *spacc_alg = to_spacc_aead(alg);
691 struct spacc_engine *engine = spacc_alg->engine;
692
693 ctx->generic.flags = spacc_alg->type;
694 ctx->generic.engine = engine;
695 ctx->sw_cipher = crypto_alloc_aead(alg->base.cra_name, 0,
696 CRYPTO_ALG_NEED_FALLBACK);
697 if (IS_ERR(ctx->sw_cipher))
698 return PTR_ERR(ctx->sw_cipher);
699 ctx->generic.key_offs = spacc_alg->key_offs;
700 ctx->generic.iv_offs = spacc_alg->iv_offs;
701
702 crypto_aead_set_reqsize(
703 tfm,
704 max(sizeof(struct spacc_req),
705 sizeof(struct aead_request) +
706 crypto_aead_reqsize(ctx->sw_cipher)));
707
708 return 0;
709 }
710
711 /*
712 * Destructor for an AEAD context. This is called when the transform is freed
713 * and must free the fallback cipher.
714 */
spacc_aead_cra_exit(struct crypto_aead * tfm)715 static void spacc_aead_cra_exit(struct crypto_aead *tfm)
716 {
717 struct spacc_aead_ctx *ctx = crypto_aead_ctx(tfm);
718
719 crypto_free_aead(ctx->sw_cipher);
720 }
721
722 /*
723 * Set the DES key for a block cipher transform. This also performs weak key
724 * checking if the transform has requested it.
725 */
spacc_des_setkey(struct crypto_ablkcipher * cipher,const u8 * key,unsigned int len)726 static int spacc_des_setkey(struct crypto_ablkcipher *cipher, const u8 *key,
727 unsigned int len)
728 {
729 struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
730 struct spacc_ablk_ctx *ctx = crypto_tfm_ctx(tfm);
731 u32 tmp[DES_EXPKEY_WORDS];
732
733 if (len > DES3_EDE_KEY_SIZE) {
734 crypto_ablkcipher_set_flags(cipher, CRYPTO_TFM_RES_BAD_KEY_LEN);
735 return -EINVAL;
736 }
737
738 if (unlikely(!des_ekey(tmp, key)) &&
739 (crypto_ablkcipher_get_flags(cipher) & CRYPTO_TFM_REQ_WEAK_KEY)) {
740 tfm->crt_flags |= CRYPTO_TFM_RES_WEAK_KEY;
741 return -EINVAL;
742 }
743
744 memcpy(ctx->key, key, len);
745 ctx->key_len = len;
746
747 return 0;
748 }
749
750 /*
751 * Set the key for an AES block cipher. Some key lengths are not supported in
752 * hardware so this must also check whether a fallback is needed.
753 */
spacc_aes_setkey(struct crypto_ablkcipher * cipher,const u8 * key,unsigned int len)754 static int spacc_aes_setkey(struct crypto_ablkcipher *cipher, const u8 *key,
755 unsigned int len)
756 {
757 struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
758 struct spacc_ablk_ctx *ctx = crypto_tfm_ctx(tfm);
759 int err = 0;
760
761 if (len > AES_MAX_KEY_SIZE) {
762 crypto_ablkcipher_set_flags(cipher, CRYPTO_TFM_RES_BAD_KEY_LEN);
763 return -EINVAL;
764 }
765
766 /*
767 * IPSec engine only supports 128 and 256 bit AES keys. If we get a
768 * request for any other size (192 bits) then we need to do a software
769 * fallback.
770 */
771 if (len != AES_KEYSIZE_128 && len != AES_KEYSIZE_256 &&
772 ctx->sw_cipher) {
773 /*
774 * Set the fallback transform to use the same request flags as
775 * the hardware transform.
776 */
777 ctx->sw_cipher->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
778 ctx->sw_cipher->base.crt_flags |=
779 cipher->base.crt_flags & CRYPTO_TFM_REQ_MASK;
780
781 err = crypto_ablkcipher_setkey(ctx->sw_cipher, key, len);
782 if (err)
783 goto sw_setkey_failed;
784 } else if (len != AES_KEYSIZE_128 && len != AES_KEYSIZE_256 &&
785 !ctx->sw_cipher)
786 err = -EINVAL;
787
788 memcpy(ctx->key, key, len);
789 ctx->key_len = len;
790
791 sw_setkey_failed:
792 if (err && ctx->sw_cipher) {
793 tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
794 tfm->crt_flags |=
795 ctx->sw_cipher->base.crt_flags & CRYPTO_TFM_RES_MASK;
796 }
797
798 return err;
799 }
800
spacc_kasumi_f8_setkey(struct crypto_ablkcipher * cipher,const u8 * key,unsigned int len)801 static int spacc_kasumi_f8_setkey(struct crypto_ablkcipher *cipher,
802 const u8 *key, unsigned int len)
803 {
804 struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
805 struct spacc_ablk_ctx *ctx = crypto_tfm_ctx(tfm);
806 int err = 0;
807
808 if (len > AES_MAX_KEY_SIZE) {
809 crypto_ablkcipher_set_flags(cipher, CRYPTO_TFM_RES_BAD_KEY_LEN);
810 err = -EINVAL;
811 goto out;
812 }
813
814 memcpy(ctx->key, key, len);
815 ctx->key_len = len;
816
817 out:
818 return err;
819 }
820
spacc_ablk_need_fallback(struct spacc_req * req)821 static int spacc_ablk_need_fallback(struct spacc_req *req)
822 {
823 struct spacc_ablk_ctx *ctx;
824 struct crypto_tfm *tfm = req->req->tfm;
825 struct crypto_alg *alg = req->req->tfm->__crt_alg;
826 struct spacc_alg *spacc_alg = to_spacc_alg(alg);
827
828 ctx = crypto_tfm_ctx(tfm);
829
830 return (spacc_alg->ctrl_default & SPACC_CRYPTO_ALG_MASK) ==
831 SPA_CTRL_CIPH_ALG_AES &&
832 ctx->key_len != AES_KEYSIZE_128 &&
833 ctx->key_len != AES_KEYSIZE_256;
834 }
835
spacc_ablk_complete(struct spacc_req * req)836 static void spacc_ablk_complete(struct spacc_req *req)
837 {
838 struct ablkcipher_request *ablk_req =
839 container_of(req->req, struct ablkcipher_request, base);
840
841 if (ablk_req->src != ablk_req->dst) {
842 spacc_free_ddt(req, req->src_ddt, req->src_addr, ablk_req->src,
843 ablk_req->nbytes, DMA_TO_DEVICE);
844 spacc_free_ddt(req, req->dst_ddt, req->dst_addr, ablk_req->dst,
845 ablk_req->nbytes, DMA_FROM_DEVICE);
846 } else
847 spacc_free_ddt(req, req->dst_ddt, req->dst_addr, ablk_req->dst,
848 ablk_req->nbytes, DMA_BIDIRECTIONAL);
849
850 req->req->complete(req->req, req->result);
851 }
852
spacc_ablk_submit(struct spacc_req * req)853 static int spacc_ablk_submit(struct spacc_req *req)
854 {
855 struct crypto_tfm *tfm = req->req->tfm;
856 struct spacc_ablk_ctx *ctx = crypto_tfm_ctx(tfm);
857 struct ablkcipher_request *ablk_req = ablkcipher_request_cast(req->req);
858 struct crypto_alg *alg = req->req->tfm->__crt_alg;
859 struct spacc_alg *spacc_alg = to_spacc_alg(alg);
860 struct spacc_engine *engine = ctx->generic.engine;
861 u32 ctrl;
862
863 req->ctx_id = spacc_load_ctx(&ctx->generic, ctx->key,
864 ctx->key_len, ablk_req->info, alg->cra_ablkcipher.ivsize,
865 NULL, 0);
866
867 writel(req->src_addr, engine->regs + SPA_SRC_PTR_REG_OFFSET);
868 writel(req->dst_addr, engine->regs + SPA_DST_PTR_REG_OFFSET);
869 writel(0, engine->regs + SPA_OFFSET_REG_OFFSET);
870
871 writel(ablk_req->nbytes, engine->regs + SPA_PROC_LEN_REG_OFFSET);
872 writel(0, engine->regs + SPA_ICV_OFFSET_REG_OFFSET);
873 writel(0, engine->regs + SPA_AUX_INFO_REG_OFFSET);
874 writel(0, engine->regs + SPA_AAD_LEN_REG_OFFSET);
875
876 ctrl = spacc_alg->ctrl_default | (req->ctx_id << SPA_CTRL_CTX_IDX) |
877 (req->is_encrypt ? (1 << SPA_CTRL_ENCRYPT_IDX) :
878 (1 << SPA_CTRL_KEY_EXP));
879
880 mod_timer(&engine->packet_timeout, jiffies + PACKET_TIMEOUT);
881
882 writel(ctrl, engine->regs + SPA_CTRL_REG_OFFSET);
883
884 return -EINPROGRESS;
885 }
886
spacc_ablk_do_fallback(struct ablkcipher_request * req,unsigned alg_type,bool is_encrypt)887 static int spacc_ablk_do_fallback(struct ablkcipher_request *req,
888 unsigned alg_type, bool is_encrypt)
889 {
890 struct crypto_tfm *old_tfm =
891 crypto_ablkcipher_tfm(crypto_ablkcipher_reqtfm(req));
892 struct spacc_ablk_ctx *ctx = crypto_tfm_ctx(old_tfm);
893 int err;
894
895 if (!ctx->sw_cipher)
896 return -EINVAL;
897
898 /*
899 * Change the request to use the software fallback transform, and once
900 * the ciphering has completed, put the old transform back into the
901 * request.
902 */
903 ablkcipher_request_set_tfm(req, ctx->sw_cipher);
904 err = is_encrypt ? crypto_ablkcipher_encrypt(req) :
905 crypto_ablkcipher_decrypt(req);
906 ablkcipher_request_set_tfm(req, __crypto_ablkcipher_cast(old_tfm));
907
908 return err;
909 }
910
spacc_ablk_setup(struct ablkcipher_request * req,unsigned alg_type,bool is_encrypt)911 static int spacc_ablk_setup(struct ablkcipher_request *req, unsigned alg_type,
912 bool is_encrypt)
913 {
914 struct crypto_alg *alg = req->base.tfm->__crt_alg;
915 struct spacc_engine *engine = to_spacc_alg(alg)->engine;
916 struct spacc_req *dev_req = ablkcipher_request_ctx(req);
917 unsigned long flags;
918 int err = -ENOMEM;
919
920 dev_req->req = &req->base;
921 dev_req->is_encrypt = is_encrypt;
922 dev_req->engine = engine;
923 dev_req->complete = spacc_ablk_complete;
924 dev_req->result = -EINPROGRESS;
925
926 if (unlikely(spacc_ablk_need_fallback(dev_req)))
927 return spacc_ablk_do_fallback(req, alg_type, is_encrypt);
928
929 /*
930 * Create the DDT's for the engine. If we share the same source and
931 * destination then we can optimize by reusing the DDT's.
932 */
933 if (req->src != req->dst) {
934 dev_req->src_ddt = spacc_sg_to_ddt(engine, req->src,
935 req->nbytes, DMA_TO_DEVICE, &dev_req->src_addr);
936 if (!dev_req->src_ddt)
937 goto out;
938
939 dev_req->dst_ddt = spacc_sg_to_ddt(engine, req->dst,
940 req->nbytes, DMA_FROM_DEVICE, &dev_req->dst_addr);
941 if (!dev_req->dst_ddt)
942 goto out_free_src;
943 } else {
944 dev_req->dst_ddt = spacc_sg_to_ddt(engine, req->dst,
945 req->nbytes, DMA_BIDIRECTIONAL, &dev_req->dst_addr);
946 if (!dev_req->dst_ddt)
947 goto out;
948
949 dev_req->src_ddt = NULL;
950 dev_req->src_addr = dev_req->dst_addr;
951 }
952
953 err = -EINPROGRESS;
954 spin_lock_irqsave(&engine->hw_lock, flags);
955 /*
956 * Check if the engine will accept the operation now. If it won't then
957 * we either stick it on the end of a pending list if we can backlog,
958 * or bailout with an error if not.
959 */
960 if (unlikely(spacc_fifo_cmd_full(engine)) ||
961 engine->in_flight + 1 > engine->fifo_sz) {
962 if (!(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
963 err = -EBUSY;
964 spin_unlock_irqrestore(&engine->hw_lock, flags);
965 goto out_free_ddts;
966 }
967 list_add_tail(&dev_req->list, &engine->pending);
968 } else {
969 list_add_tail(&dev_req->list, &engine->pending);
970 spacc_push(engine);
971 }
972 spin_unlock_irqrestore(&engine->hw_lock, flags);
973
974 goto out;
975
976 out_free_ddts:
977 spacc_free_ddt(dev_req, dev_req->dst_ddt, dev_req->dst_addr, req->dst,
978 req->nbytes, req->src == req->dst ?
979 DMA_BIDIRECTIONAL : DMA_FROM_DEVICE);
980 out_free_src:
981 if (req->src != req->dst)
982 spacc_free_ddt(dev_req, dev_req->src_ddt, dev_req->src_addr,
983 req->src, req->nbytes, DMA_TO_DEVICE);
984 out:
985 return err;
986 }
987
spacc_ablk_cra_init(struct crypto_tfm * tfm)988 static int spacc_ablk_cra_init(struct crypto_tfm *tfm)
989 {
990 struct spacc_ablk_ctx *ctx = crypto_tfm_ctx(tfm);
991 struct crypto_alg *alg = tfm->__crt_alg;
992 struct spacc_alg *spacc_alg = to_spacc_alg(alg);
993 struct spacc_engine *engine = spacc_alg->engine;
994
995 ctx->generic.flags = spacc_alg->type;
996 ctx->generic.engine = engine;
997 if (alg->cra_flags & CRYPTO_ALG_NEED_FALLBACK) {
998 ctx->sw_cipher = crypto_alloc_ablkcipher(alg->cra_name, 0,
999 CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);
1000 if (IS_ERR(ctx->sw_cipher)) {
1001 dev_warn(engine->dev, "failed to allocate fallback for %s\n",
1002 alg->cra_name);
1003 ctx->sw_cipher = NULL;
1004 }
1005 }
1006 ctx->generic.key_offs = spacc_alg->key_offs;
1007 ctx->generic.iv_offs = spacc_alg->iv_offs;
1008
1009 tfm->crt_ablkcipher.reqsize = sizeof(struct spacc_req);
1010
1011 return 0;
1012 }
1013
spacc_ablk_cra_exit(struct crypto_tfm * tfm)1014 static void spacc_ablk_cra_exit(struct crypto_tfm *tfm)
1015 {
1016 struct spacc_ablk_ctx *ctx = crypto_tfm_ctx(tfm);
1017
1018 if (ctx->sw_cipher)
1019 crypto_free_ablkcipher(ctx->sw_cipher);
1020 ctx->sw_cipher = NULL;
1021 }
1022
spacc_ablk_encrypt(struct ablkcipher_request * req)1023 static int spacc_ablk_encrypt(struct ablkcipher_request *req)
1024 {
1025 struct crypto_ablkcipher *cipher = crypto_ablkcipher_reqtfm(req);
1026 struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
1027 struct spacc_alg *alg = to_spacc_alg(tfm->__crt_alg);
1028
1029 return spacc_ablk_setup(req, alg->type, 1);
1030 }
1031
spacc_ablk_decrypt(struct ablkcipher_request * req)1032 static int spacc_ablk_decrypt(struct ablkcipher_request *req)
1033 {
1034 struct crypto_ablkcipher *cipher = crypto_ablkcipher_reqtfm(req);
1035 struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
1036 struct spacc_alg *alg = to_spacc_alg(tfm->__crt_alg);
1037
1038 return spacc_ablk_setup(req, alg->type, 0);
1039 }
1040
spacc_fifo_stat_empty(struct spacc_engine * engine)1041 static inline int spacc_fifo_stat_empty(struct spacc_engine *engine)
1042 {
1043 return readl(engine->regs + SPA_FIFO_STAT_REG_OFFSET) &
1044 SPA_FIFO_STAT_EMPTY;
1045 }
1046
spacc_process_done(struct spacc_engine * engine)1047 static void spacc_process_done(struct spacc_engine *engine)
1048 {
1049 struct spacc_req *req;
1050 unsigned long flags;
1051
1052 spin_lock_irqsave(&engine->hw_lock, flags);
1053
1054 while (!spacc_fifo_stat_empty(engine)) {
1055 req = list_first_entry(&engine->in_progress, struct spacc_req,
1056 list);
1057 list_move_tail(&req->list, &engine->completed);
1058 --engine->in_flight;
1059
1060 /* POP the status register. */
1061 writel(~0, engine->regs + SPA_STAT_POP_REG_OFFSET);
1062 req->result = (readl(engine->regs + SPA_STATUS_REG_OFFSET) &
1063 SPA_STATUS_RES_CODE_MASK) >> SPA_STATUS_RES_CODE_OFFSET;
1064
1065 /*
1066 * Convert the SPAcc error status into the standard POSIX error
1067 * codes.
1068 */
1069 if (unlikely(req->result)) {
1070 switch (req->result) {
1071 case SPA_STATUS_ICV_FAIL:
1072 req->result = -EBADMSG;
1073 break;
1074
1075 case SPA_STATUS_MEMORY_ERROR:
1076 dev_warn(engine->dev,
1077 "memory error triggered\n");
1078 req->result = -EFAULT;
1079 break;
1080
1081 case SPA_STATUS_BLOCK_ERROR:
1082 dev_warn(engine->dev,
1083 "block error triggered\n");
1084 req->result = -EIO;
1085 break;
1086 }
1087 }
1088 }
1089
1090 tasklet_schedule(&engine->complete);
1091
1092 spin_unlock_irqrestore(&engine->hw_lock, flags);
1093 }
1094
spacc_spacc_irq(int irq,void * dev)1095 static irqreturn_t spacc_spacc_irq(int irq, void *dev)
1096 {
1097 struct spacc_engine *engine = (struct spacc_engine *)dev;
1098 u32 spacc_irq_stat = readl(engine->regs + SPA_IRQ_STAT_REG_OFFSET);
1099
1100 writel(spacc_irq_stat, engine->regs + SPA_IRQ_STAT_REG_OFFSET);
1101 spacc_process_done(engine);
1102
1103 return IRQ_HANDLED;
1104 }
1105
spacc_packet_timeout(unsigned long data)1106 static void spacc_packet_timeout(unsigned long data)
1107 {
1108 struct spacc_engine *engine = (struct spacc_engine *)data;
1109
1110 spacc_process_done(engine);
1111 }
1112
spacc_req_submit(struct spacc_req * req)1113 static int spacc_req_submit(struct spacc_req *req)
1114 {
1115 struct crypto_alg *alg = req->req->tfm->__crt_alg;
1116
1117 if (CRYPTO_ALG_TYPE_AEAD == (CRYPTO_ALG_TYPE_MASK & alg->cra_flags))
1118 return spacc_aead_submit(req);
1119 else
1120 return spacc_ablk_submit(req);
1121 }
1122
spacc_spacc_complete(unsigned long data)1123 static void spacc_spacc_complete(unsigned long data)
1124 {
1125 struct spacc_engine *engine = (struct spacc_engine *)data;
1126 struct spacc_req *req, *tmp;
1127 unsigned long flags;
1128 LIST_HEAD(completed);
1129
1130 spin_lock_irqsave(&engine->hw_lock, flags);
1131
1132 list_splice_init(&engine->completed, &completed);
1133 spacc_push(engine);
1134 if (engine->in_flight)
1135 mod_timer(&engine->packet_timeout, jiffies + PACKET_TIMEOUT);
1136
1137 spin_unlock_irqrestore(&engine->hw_lock, flags);
1138
1139 list_for_each_entry_safe(req, tmp, &completed, list) {
1140 list_del(&req->list);
1141 req->complete(req);
1142 }
1143 }
1144
1145 #ifdef CONFIG_PM
spacc_suspend(struct device * dev)1146 static int spacc_suspend(struct device *dev)
1147 {
1148 struct platform_device *pdev = to_platform_device(dev);
1149 struct spacc_engine *engine = platform_get_drvdata(pdev);
1150
1151 /*
1152 * We only support standby mode. All we have to do is gate the clock to
1153 * the spacc. The hardware will preserve state until we turn it back
1154 * on again.
1155 */
1156 clk_disable(engine->clk);
1157
1158 return 0;
1159 }
1160
spacc_resume(struct device * dev)1161 static int spacc_resume(struct device *dev)
1162 {
1163 struct platform_device *pdev = to_platform_device(dev);
1164 struct spacc_engine *engine = platform_get_drvdata(pdev);
1165
1166 return clk_enable(engine->clk);
1167 }
1168
1169 static const struct dev_pm_ops spacc_pm_ops = {
1170 .suspend = spacc_suspend,
1171 .resume = spacc_resume,
1172 };
1173 #endif /* CONFIG_PM */
1174
spacc_dev_to_engine(struct device * dev)1175 static inline struct spacc_engine *spacc_dev_to_engine(struct device *dev)
1176 {
1177 return dev ? platform_get_drvdata(to_platform_device(dev)) : NULL;
1178 }
1179
spacc_stat_irq_thresh_show(struct device * dev,struct device_attribute * attr,char * buf)1180 static ssize_t spacc_stat_irq_thresh_show(struct device *dev,
1181 struct device_attribute *attr,
1182 char *buf)
1183 {
1184 struct spacc_engine *engine = spacc_dev_to_engine(dev);
1185
1186 return snprintf(buf, PAGE_SIZE, "%u\n", engine->stat_irq_thresh);
1187 }
1188
spacc_stat_irq_thresh_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t len)1189 static ssize_t spacc_stat_irq_thresh_store(struct device *dev,
1190 struct device_attribute *attr,
1191 const char *buf, size_t len)
1192 {
1193 struct spacc_engine *engine = spacc_dev_to_engine(dev);
1194 unsigned long thresh;
1195
1196 if (kstrtoul(buf, 0, &thresh))
1197 return -EINVAL;
1198
1199 thresh = clamp(thresh, 1UL, engine->fifo_sz - 1);
1200
1201 engine->stat_irq_thresh = thresh;
1202 writel(engine->stat_irq_thresh << SPA_IRQ_CTRL_STAT_CNT_OFFSET,
1203 engine->regs + SPA_IRQ_CTRL_REG_OFFSET);
1204
1205 return len;
1206 }
1207 static DEVICE_ATTR(stat_irq_thresh, 0644, spacc_stat_irq_thresh_show,
1208 spacc_stat_irq_thresh_store);
1209
1210 static struct spacc_alg ipsec_engine_algs[] = {
1211 {
1212 .ctrl_default = SPA_CTRL_CIPH_ALG_AES | SPA_CTRL_CIPH_MODE_CBC,
1213 .key_offs = 0,
1214 .iv_offs = AES_MAX_KEY_SIZE,
1215 .alg = {
1216 .cra_name = "cbc(aes)",
1217 .cra_driver_name = "cbc-aes-picoxcell",
1218 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1219 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
1220 CRYPTO_ALG_KERN_DRIVER_ONLY |
1221 CRYPTO_ALG_ASYNC |
1222 CRYPTO_ALG_NEED_FALLBACK,
1223 .cra_blocksize = AES_BLOCK_SIZE,
1224 .cra_ctxsize = sizeof(struct spacc_ablk_ctx),
1225 .cra_type = &crypto_ablkcipher_type,
1226 .cra_module = THIS_MODULE,
1227 .cra_ablkcipher = {
1228 .setkey = spacc_aes_setkey,
1229 .encrypt = spacc_ablk_encrypt,
1230 .decrypt = spacc_ablk_decrypt,
1231 .min_keysize = AES_MIN_KEY_SIZE,
1232 .max_keysize = AES_MAX_KEY_SIZE,
1233 .ivsize = AES_BLOCK_SIZE,
1234 },
1235 .cra_init = spacc_ablk_cra_init,
1236 .cra_exit = spacc_ablk_cra_exit,
1237 },
1238 },
1239 {
1240 .key_offs = 0,
1241 .iv_offs = AES_MAX_KEY_SIZE,
1242 .ctrl_default = SPA_CTRL_CIPH_ALG_AES | SPA_CTRL_CIPH_MODE_ECB,
1243 .alg = {
1244 .cra_name = "ecb(aes)",
1245 .cra_driver_name = "ecb-aes-picoxcell",
1246 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1247 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
1248 CRYPTO_ALG_KERN_DRIVER_ONLY |
1249 CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK,
1250 .cra_blocksize = AES_BLOCK_SIZE,
1251 .cra_ctxsize = sizeof(struct spacc_ablk_ctx),
1252 .cra_type = &crypto_ablkcipher_type,
1253 .cra_module = THIS_MODULE,
1254 .cra_ablkcipher = {
1255 .setkey = spacc_aes_setkey,
1256 .encrypt = spacc_ablk_encrypt,
1257 .decrypt = spacc_ablk_decrypt,
1258 .min_keysize = AES_MIN_KEY_SIZE,
1259 .max_keysize = AES_MAX_KEY_SIZE,
1260 },
1261 .cra_init = spacc_ablk_cra_init,
1262 .cra_exit = spacc_ablk_cra_exit,
1263 },
1264 },
1265 {
1266 .key_offs = DES_BLOCK_SIZE,
1267 .iv_offs = 0,
1268 .ctrl_default = SPA_CTRL_CIPH_ALG_DES | SPA_CTRL_CIPH_MODE_CBC,
1269 .alg = {
1270 .cra_name = "cbc(des)",
1271 .cra_driver_name = "cbc-des-picoxcell",
1272 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1273 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
1274 CRYPTO_ALG_ASYNC |
1275 CRYPTO_ALG_KERN_DRIVER_ONLY,
1276 .cra_blocksize = DES_BLOCK_SIZE,
1277 .cra_ctxsize = sizeof(struct spacc_ablk_ctx),
1278 .cra_type = &crypto_ablkcipher_type,
1279 .cra_module = THIS_MODULE,
1280 .cra_ablkcipher = {
1281 .setkey = spacc_des_setkey,
1282 .encrypt = spacc_ablk_encrypt,
1283 .decrypt = spacc_ablk_decrypt,
1284 .min_keysize = DES_KEY_SIZE,
1285 .max_keysize = DES_KEY_SIZE,
1286 .ivsize = DES_BLOCK_SIZE,
1287 },
1288 .cra_init = spacc_ablk_cra_init,
1289 .cra_exit = spacc_ablk_cra_exit,
1290 },
1291 },
1292 {
1293 .key_offs = DES_BLOCK_SIZE,
1294 .iv_offs = 0,
1295 .ctrl_default = SPA_CTRL_CIPH_ALG_DES | SPA_CTRL_CIPH_MODE_ECB,
1296 .alg = {
1297 .cra_name = "ecb(des)",
1298 .cra_driver_name = "ecb-des-picoxcell",
1299 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1300 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
1301 CRYPTO_ALG_ASYNC |
1302 CRYPTO_ALG_KERN_DRIVER_ONLY,
1303 .cra_blocksize = DES_BLOCK_SIZE,
1304 .cra_ctxsize = sizeof(struct spacc_ablk_ctx),
1305 .cra_type = &crypto_ablkcipher_type,
1306 .cra_module = THIS_MODULE,
1307 .cra_ablkcipher = {
1308 .setkey = spacc_des_setkey,
1309 .encrypt = spacc_ablk_encrypt,
1310 .decrypt = spacc_ablk_decrypt,
1311 .min_keysize = DES_KEY_SIZE,
1312 .max_keysize = DES_KEY_SIZE,
1313 },
1314 .cra_init = spacc_ablk_cra_init,
1315 .cra_exit = spacc_ablk_cra_exit,
1316 },
1317 },
1318 {
1319 .key_offs = DES_BLOCK_SIZE,
1320 .iv_offs = 0,
1321 .ctrl_default = SPA_CTRL_CIPH_ALG_DES | SPA_CTRL_CIPH_MODE_CBC,
1322 .alg = {
1323 .cra_name = "cbc(des3_ede)",
1324 .cra_driver_name = "cbc-des3-ede-picoxcell",
1325 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1326 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
1327 CRYPTO_ALG_ASYNC |
1328 CRYPTO_ALG_KERN_DRIVER_ONLY,
1329 .cra_blocksize = DES3_EDE_BLOCK_SIZE,
1330 .cra_ctxsize = sizeof(struct spacc_ablk_ctx),
1331 .cra_type = &crypto_ablkcipher_type,
1332 .cra_module = THIS_MODULE,
1333 .cra_ablkcipher = {
1334 .setkey = spacc_des_setkey,
1335 .encrypt = spacc_ablk_encrypt,
1336 .decrypt = spacc_ablk_decrypt,
1337 .min_keysize = DES3_EDE_KEY_SIZE,
1338 .max_keysize = DES3_EDE_KEY_SIZE,
1339 .ivsize = DES3_EDE_BLOCK_SIZE,
1340 },
1341 .cra_init = spacc_ablk_cra_init,
1342 .cra_exit = spacc_ablk_cra_exit,
1343 },
1344 },
1345 {
1346 .key_offs = DES_BLOCK_SIZE,
1347 .iv_offs = 0,
1348 .ctrl_default = SPA_CTRL_CIPH_ALG_DES | SPA_CTRL_CIPH_MODE_ECB,
1349 .alg = {
1350 .cra_name = "ecb(des3_ede)",
1351 .cra_driver_name = "ecb-des3-ede-picoxcell",
1352 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1353 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
1354 CRYPTO_ALG_ASYNC |
1355 CRYPTO_ALG_KERN_DRIVER_ONLY,
1356 .cra_blocksize = DES3_EDE_BLOCK_SIZE,
1357 .cra_ctxsize = sizeof(struct spacc_ablk_ctx),
1358 .cra_type = &crypto_ablkcipher_type,
1359 .cra_module = THIS_MODULE,
1360 .cra_ablkcipher = {
1361 .setkey = spacc_des_setkey,
1362 .encrypt = spacc_ablk_encrypt,
1363 .decrypt = spacc_ablk_decrypt,
1364 .min_keysize = DES3_EDE_KEY_SIZE,
1365 .max_keysize = DES3_EDE_KEY_SIZE,
1366 },
1367 .cra_init = spacc_ablk_cra_init,
1368 .cra_exit = spacc_ablk_cra_exit,
1369 },
1370 },
1371 };
1372
1373 static struct spacc_aead ipsec_engine_aeads[] = {
1374 {
1375 .ctrl_default = SPA_CTRL_CIPH_ALG_AES |
1376 SPA_CTRL_CIPH_MODE_CBC |
1377 SPA_CTRL_HASH_ALG_SHA |
1378 SPA_CTRL_HASH_MODE_HMAC,
1379 .key_offs = 0,
1380 .iv_offs = AES_MAX_KEY_SIZE,
1381 .alg = {
1382 .base = {
1383 .cra_name = "authenc(hmac(sha1),cbc(aes))",
1384 .cra_driver_name = "authenc-hmac-sha1-"
1385 "cbc-aes-picoxcell",
1386 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1387 .cra_flags = CRYPTO_ALG_ASYNC |
1388 CRYPTO_ALG_NEED_FALLBACK |
1389 CRYPTO_ALG_KERN_DRIVER_ONLY,
1390 .cra_blocksize = AES_BLOCK_SIZE,
1391 .cra_ctxsize = sizeof(struct spacc_aead_ctx),
1392 .cra_module = THIS_MODULE,
1393 },
1394 .setkey = spacc_aead_setkey,
1395 .setauthsize = spacc_aead_setauthsize,
1396 .encrypt = spacc_aead_encrypt,
1397 .decrypt = spacc_aead_decrypt,
1398 .ivsize = AES_BLOCK_SIZE,
1399 .maxauthsize = SHA1_DIGEST_SIZE,
1400 .init = spacc_aead_cra_init,
1401 .exit = spacc_aead_cra_exit,
1402 },
1403 },
1404 {
1405 .ctrl_default = SPA_CTRL_CIPH_ALG_AES |
1406 SPA_CTRL_CIPH_MODE_CBC |
1407 SPA_CTRL_HASH_ALG_SHA256 |
1408 SPA_CTRL_HASH_MODE_HMAC,
1409 .key_offs = 0,
1410 .iv_offs = AES_MAX_KEY_SIZE,
1411 .alg = {
1412 .base = {
1413 .cra_name = "authenc(hmac(sha256),cbc(aes))",
1414 .cra_driver_name = "authenc-hmac-sha256-"
1415 "cbc-aes-picoxcell",
1416 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1417 .cra_flags = CRYPTO_ALG_ASYNC |
1418 CRYPTO_ALG_NEED_FALLBACK |
1419 CRYPTO_ALG_KERN_DRIVER_ONLY,
1420 .cra_blocksize = AES_BLOCK_SIZE,
1421 .cra_ctxsize = sizeof(struct spacc_aead_ctx),
1422 .cra_module = THIS_MODULE,
1423 },
1424 .setkey = spacc_aead_setkey,
1425 .setauthsize = spacc_aead_setauthsize,
1426 .encrypt = spacc_aead_encrypt,
1427 .decrypt = spacc_aead_decrypt,
1428 .ivsize = AES_BLOCK_SIZE,
1429 .maxauthsize = SHA256_DIGEST_SIZE,
1430 .init = spacc_aead_cra_init,
1431 .exit = spacc_aead_cra_exit,
1432 },
1433 },
1434 {
1435 .key_offs = 0,
1436 .iv_offs = AES_MAX_KEY_SIZE,
1437 .ctrl_default = SPA_CTRL_CIPH_ALG_AES |
1438 SPA_CTRL_CIPH_MODE_CBC |
1439 SPA_CTRL_HASH_ALG_MD5 |
1440 SPA_CTRL_HASH_MODE_HMAC,
1441 .alg = {
1442 .base = {
1443 .cra_name = "authenc(hmac(md5),cbc(aes))",
1444 .cra_driver_name = "authenc-hmac-md5-"
1445 "cbc-aes-picoxcell",
1446 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1447 .cra_flags = CRYPTO_ALG_ASYNC |
1448 CRYPTO_ALG_NEED_FALLBACK |
1449 CRYPTO_ALG_KERN_DRIVER_ONLY,
1450 .cra_blocksize = AES_BLOCK_SIZE,
1451 .cra_ctxsize = sizeof(struct spacc_aead_ctx),
1452 .cra_module = THIS_MODULE,
1453 },
1454 .setkey = spacc_aead_setkey,
1455 .setauthsize = spacc_aead_setauthsize,
1456 .encrypt = spacc_aead_encrypt,
1457 .decrypt = spacc_aead_decrypt,
1458 .ivsize = AES_BLOCK_SIZE,
1459 .maxauthsize = MD5_DIGEST_SIZE,
1460 .init = spacc_aead_cra_init,
1461 .exit = spacc_aead_cra_exit,
1462 },
1463 },
1464 {
1465 .key_offs = DES_BLOCK_SIZE,
1466 .iv_offs = 0,
1467 .ctrl_default = SPA_CTRL_CIPH_ALG_DES |
1468 SPA_CTRL_CIPH_MODE_CBC |
1469 SPA_CTRL_HASH_ALG_SHA |
1470 SPA_CTRL_HASH_MODE_HMAC,
1471 .alg = {
1472 .base = {
1473 .cra_name = "authenc(hmac(sha1),cbc(des3_ede))",
1474 .cra_driver_name = "authenc-hmac-sha1-"
1475 "cbc-3des-picoxcell",
1476 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1477 .cra_flags = CRYPTO_ALG_ASYNC |
1478 CRYPTO_ALG_NEED_FALLBACK |
1479 CRYPTO_ALG_KERN_DRIVER_ONLY,
1480 .cra_blocksize = DES3_EDE_BLOCK_SIZE,
1481 .cra_ctxsize = sizeof(struct spacc_aead_ctx),
1482 .cra_module = THIS_MODULE,
1483 },
1484 .setkey = spacc_aead_setkey,
1485 .setauthsize = spacc_aead_setauthsize,
1486 .encrypt = spacc_aead_encrypt,
1487 .decrypt = spacc_aead_decrypt,
1488 .ivsize = DES3_EDE_BLOCK_SIZE,
1489 .maxauthsize = SHA1_DIGEST_SIZE,
1490 .init = spacc_aead_cra_init,
1491 .exit = spacc_aead_cra_exit,
1492 },
1493 },
1494 {
1495 .key_offs = DES_BLOCK_SIZE,
1496 .iv_offs = 0,
1497 .ctrl_default = SPA_CTRL_CIPH_ALG_AES |
1498 SPA_CTRL_CIPH_MODE_CBC |
1499 SPA_CTRL_HASH_ALG_SHA256 |
1500 SPA_CTRL_HASH_MODE_HMAC,
1501 .alg = {
1502 .base = {
1503 .cra_name = "authenc(hmac(sha256),"
1504 "cbc(des3_ede))",
1505 .cra_driver_name = "authenc-hmac-sha256-"
1506 "cbc-3des-picoxcell",
1507 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1508 .cra_flags = CRYPTO_ALG_ASYNC |
1509 CRYPTO_ALG_NEED_FALLBACK |
1510 CRYPTO_ALG_KERN_DRIVER_ONLY,
1511 .cra_blocksize = DES3_EDE_BLOCK_SIZE,
1512 .cra_ctxsize = sizeof(struct spacc_aead_ctx),
1513 .cra_module = THIS_MODULE,
1514 },
1515 .setkey = spacc_aead_setkey,
1516 .setauthsize = spacc_aead_setauthsize,
1517 .encrypt = spacc_aead_encrypt,
1518 .decrypt = spacc_aead_decrypt,
1519 .ivsize = DES3_EDE_BLOCK_SIZE,
1520 .maxauthsize = SHA256_DIGEST_SIZE,
1521 .init = spacc_aead_cra_init,
1522 .exit = spacc_aead_cra_exit,
1523 },
1524 },
1525 {
1526 .key_offs = DES_BLOCK_SIZE,
1527 .iv_offs = 0,
1528 .ctrl_default = SPA_CTRL_CIPH_ALG_DES |
1529 SPA_CTRL_CIPH_MODE_CBC |
1530 SPA_CTRL_HASH_ALG_MD5 |
1531 SPA_CTRL_HASH_MODE_HMAC,
1532 .alg = {
1533 .base = {
1534 .cra_name = "authenc(hmac(md5),cbc(des3_ede))",
1535 .cra_driver_name = "authenc-hmac-md5-"
1536 "cbc-3des-picoxcell",
1537 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1538 .cra_flags = CRYPTO_ALG_ASYNC |
1539 CRYPTO_ALG_NEED_FALLBACK |
1540 CRYPTO_ALG_KERN_DRIVER_ONLY,
1541 .cra_blocksize = DES3_EDE_BLOCK_SIZE,
1542 .cra_ctxsize = sizeof(struct spacc_aead_ctx),
1543 .cra_module = THIS_MODULE,
1544 },
1545 .setkey = spacc_aead_setkey,
1546 .setauthsize = spacc_aead_setauthsize,
1547 .encrypt = spacc_aead_encrypt,
1548 .decrypt = spacc_aead_decrypt,
1549 .ivsize = DES3_EDE_BLOCK_SIZE,
1550 .maxauthsize = MD5_DIGEST_SIZE,
1551 .init = spacc_aead_cra_init,
1552 .exit = spacc_aead_cra_exit,
1553 },
1554 },
1555 };
1556
1557 static struct spacc_alg l2_engine_algs[] = {
1558 {
1559 .key_offs = 0,
1560 .iv_offs = SPACC_CRYPTO_KASUMI_F8_KEY_LEN,
1561 .ctrl_default = SPA_CTRL_CIPH_ALG_KASUMI |
1562 SPA_CTRL_CIPH_MODE_F8,
1563 .alg = {
1564 .cra_name = "f8(kasumi)",
1565 .cra_driver_name = "f8-kasumi-picoxcell",
1566 .cra_priority = SPACC_CRYPTO_ALG_PRIORITY,
1567 .cra_flags = CRYPTO_ALG_TYPE_GIVCIPHER |
1568 CRYPTO_ALG_ASYNC |
1569 CRYPTO_ALG_KERN_DRIVER_ONLY,
1570 .cra_blocksize = 8,
1571 .cra_ctxsize = sizeof(struct spacc_ablk_ctx),
1572 .cra_type = &crypto_ablkcipher_type,
1573 .cra_module = THIS_MODULE,
1574 .cra_ablkcipher = {
1575 .setkey = spacc_kasumi_f8_setkey,
1576 .encrypt = spacc_ablk_encrypt,
1577 .decrypt = spacc_ablk_decrypt,
1578 .min_keysize = 16,
1579 .max_keysize = 16,
1580 .ivsize = 8,
1581 },
1582 .cra_init = spacc_ablk_cra_init,
1583 .cra_exit = spacc_ablk_cra_exit,
1584 },
1585 },
1586 };
1587
1588 #ifdef CONFIG_OF
1589 static const struct of_device_id spacc_of_id_table[] = {
1590 { .compatible = "picochip,spacc-ipsec" },
1591 { .compatible = "picochip,spacc-l2" },
1592 {}
1593 };
1594 MODULE_DEVICE_TABLE(of, spacc_of_id_table);
1595 #endif /* CONFIG_OF */
1596
spacc_is_compatible(struct platform_device * pdev,const char * spacc_type)1597 static bool spacc_is_compatible(struct platform_device *pdev,
1598 const char *spacc_type)
1599 {
1600 const struct platform_device_id *platid = platform_get_device_id(pdev);
1601
1602 if (platid && !strcmp(platid->name, spacc_type))
1603 return true;
1604
1605 #ifdef CONFIG_OF
1606 if (of_device_is_compatible(pdev->dev.of_node, spacc_type))
1607 return true;
1608 #endif /* CONFIG_OF */
1609
1610 return false;
1611 }
1612
spacc_tasklet_kill(void * data)1613 static void spacc_tasklet_kill(void *data)
1614 {
1615 tasklet_kill(data);
1616 }
1617
spacc_probe(struct platform_device * pdev)1618 static int spacc_probe(struct platform_device *pdev)
1619 {
1620 int i, err, ret = -EINVAL;
1621 struct resource *mem, *irq;
1622 struct spacc_engine *engine = devm_kzalloc(&pdev->dev, sizeof(*engine),
1623 GFP_KERNEL);
1624 if (!engine)
1625 return -ENOMEM;
1626
1627 if (spacc_is_compatible(pdev, "picochip,spacc-ipsec")) {
1628 engine->max_ctxs = SPACC_CRYPTO_IPSEC_MAX_CTXS;
1629 engine->cipher_pg_sz = SPACC_CRYPTO_IPSEC_CIPHER_PG_SZ;
1630 engine->hash_pg_sz = SPACC_CRYPTO_IPSEC_HASH_PG_SZ;
1631 engine->fifo_sz = SPACC_CRYPTO_IPSEC_FIFO_SZ;
1632 engine->algs = ipsec_engine_algs;
1633 engine->num_algs = ARRAY_SIZE(ipsec_engine_algs);
1634 engine->aeads = ipsec_engine_aeads;
1635 engine->num_aeads = ARRAY_SIZE(ipsec_engine_aeads);
1636 } else if (spacc_is_compatible(pdev, "picochip,spacc-l2")) {
1637 engine->max_ctxs = SPACC_CRYPTO_L2_MAX_CTXS;
1638 engine->cipher_pg_sz = SPACC_CRYPTO_L2_CIPHER_PG_SZ;
1639 engine->hash_pg_sz = SPACC_CRYPTO_L2_HASH_PG_SZ;
1640 engine->fifo_sz = SPACC_CRYPTO_L2_FIFO_SZ;
1641 engine->algs = l2_engine_algs;
1642 engine->num_algs = ARRAY_SIZE(l2_engine_algs);
1643 } else {
1644 return -EINVAL;
1645 }
1646
1647 engine->name = dev_name(&pdev->dev);
1648
1649 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1650 engine->regs = devm_ioremap_resource(&pdev->dev, mem);
1651 if (IS_ERR(engine->regs))
1652 return PTR_ERR(engine->regs);
1653
1654 irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1655 if (!irq) {
1656 dev_err(&pdev->dev, "no memory/irq resource for engine\n");
1657 return -ENXIO;
1658 }
1659
1660 tasklet_init(&engine->complete, spacc_spacc_complete,
1661 (unsigned long)engine);
1662
1663 ret = devm_add_action(&pdev->dev, spacc_tasklet_kill,
1664 &engine->complete);
1665 if (ret)
1666 return ret;
1667
1668 if (devm_request_irq(&pdev->dev, irq->start, spacc_spacc_irq, 0,
1669 engine->name, engine)) {
1670 dev_err(engine->dev, "failed to request IRQ\n");
1671 return -EBUSY;
1672 }
1673
1674 engine->dev = &pdev->dev;
1675 engine->cipher_ctx_base = engine->regs + SPA_CIPH_KEY_BASE_REG_OFFSET;
1676 engine->hash_key_base = engine->regs + SPA_HASH_KEY_BASE_REG_OFFSET;
1677
1678 engine->req_pool = dmam_pool_create(engine->name, engine->dev,
1679 MAX_DDT_LEN * sizeof(struct spacc_ddt), 8, SZ_64K);
1680 if (!engine->req_pool)
1681 return -ENOMEM;
1682
1683 spin_lock_init(&engine->hw_lock);
1684
1685 engine->clk = clk_get(&pdev->dev, "ref");
1686 if (IS_ERR(engine->clk)) {
1687 dev_info(&pdev->dev, "clk unavailable\n");
1688 device_remove_file(&pdev->dev, &dev_attr_stat_irq_thresh);
1689 return PTR_ERR(engine->clk);
1690 }
1691
1692 if (clk_prepare_enable(engine->clk)) {
1693 dev_info(&pdev->dev, "unable to prepare/enable clk\n");
1694 clk_put(engine->clk);
1695 return -EIO;
1696 }
1697
1698 err = device_create_file(&pdev->dev, &dev_attr_stat_irq_thresh);
1699 if (err) {
1700 clk_disable_unprepare(engine->clk);
1701 clk_put(engine->clk);
1702 return err;
1703 }
1704
1705
1706 /*
1707 * Use an IRQ threshold of 50% as a default. This seems to be a
1708 * reasonable trade off of latency against throughput but can be
1709 * changed at runtime.
1710 */
1711 engine->stat_irq_thresh = (engine->fifo_sz / 2);
1712
1713 /*
1714 * Configure the interrupts. We only use the STAT_CNT interrupt as we
1715 * only submit a new packet for processing when we complete another in
1716 * the queue. This minimizes time spent in the interrupt handler.
1717 */
1718 writel(engine->stat_irq_thresh << SPA_IRQ_CTRL_STAT_CNT_OFFSET,
1719 engine->regs + SPA_IRQ_CTRL_REG_OFFSET);
1720 writel(SPA_IRQ_EN_STAT_EN | SPA_IRQ_EN_GLBL_EN,
1721 engine->regs + SPA_IRQ_EN_REG_OFFSET);
1722
1723 setup_timer(&engine->packet_timeout, spacc_packet_timeout,
1724 (unsigned long)engine);
1725
1726 INIT_LIST_HEAD(&engine->pending);
1727 INIT_LIST_HEAD(&engine->completed);
1728 INIT_LIST_HEAD(&engine->in_progress);
1729 engine->in_flight = 0;
1730
1731 platform_set_drvdata(pdev, engine);
1732
1733 INIT_LIST_HEAD(&engine->registered_algs);
1734 for (i = 0; i < engine->num_algs; ++i) {
1735 engine->algs[i].engine = engine;
1736 err = crypto_register_alg(&engine->algs[i].alg);
1737 if (!err) {
1738 list_add_tail(&engine->algs[i].entry,
1739 &engine->registered_algs);
1740 ret = 0;
1741 }
1742 if (err)
1743 dev_err(engine->dev, "failed to register alg \"%s\"\n",
1744 engine->algs[i].alg.cra_name);
1745 else
1746 dev_dbg(engine->dev, "registered alg \"%s\"\n",
1747 engine->algs[i].alg.cra_name);
1748 }
1749
1750 INIT_LIST_HEAD(&engine->registered_aeads);
1751 for (i = 0; i < engine->num_aeads; ++i) {
1752 engine->aeads[i].engine = engine;
1753 err = crypto_register_aead(&engine->aeads[i].alg);
1754 if (!err) {
1755 list_add_tail(&engine->aeads[i].entry,
1756 &engine->registered_aeads);
1757 ret = 0;
1758 }
1759 if (err)
1760 dev_err(engine->dev, "failed to register alg \"%s\"\n",
1761 engine->aeads[i].alg.base.cra_name);
1762 else
1763 dev_dbg(engine->dev, "registered alg \"%s\"\n",
1764 engine->aeads[i].alg.base.cra_name);
1765 }
1766
1767 return ret;
1768 }
1769
spacc_remove(struct platform_device * pdev)1770 static int spacc_remove(struct platform_device *pdev)
1771 {
1772 struct spacc_aead *aead, *an;
1773 struct spacc_alg *alg, *next;
1774 struct spacc_engine *engine = platform_get_drvdata(pdev);
1775
1776 del_timer_sync(&engine->packet_timeout);
1777 device_remove_file(&pdev->dev, &dev_attr_stat_irq_thresh);
1778
1779 list_for_each_entry_safe(aead, an, &engine->registered_aeads, entry) {
1780 list_del(&aead->entry);
1781 crypto_unregister_aead(&aead->alg);
1782 }
1783
1784 list_for_each_entry_safe(alg, next, &engine->registered_algs, entry) {
1785 list_del(&alg->entry);
1786 crypto_unregister_alg(&alg->alg);
1787 }
1788
1789 clk_disable_unprepare(engine->clk);
1790 clk_put(engine->clk);
1791
1792 return 0;
1793 }
1794
1795 static const struct platform_device_id spacc_id_table[] = {
1796 { "picochip,spacc-ipsec", },
1797 { "picochip,spacc-l2", },
1798 { }
1799 };
1800
1801 static struct platform_driver spacc_driver = {
1802 .probe = spacc_probe,
1803 .remove = spacc_remove,
1804 .driver = {
1805 .name = "picochip,spacc",
1806 #ifdef CONFIG_PM
1807 .pm = &spacc_pm_ops,
1808 #endif /* CONFIG_PM */
1809 .of_match_table = of_match_ptr(spacc_of_id_table),
1810 },
1811 .id_table = spacc_id_table,
1812 };
1813
1814 module_platform_driver(spacc_driver);
1815
1816 MODULE_LICENSE("GPL");
1817 MODULE_AUTHOR("Jamie Iles");
1818