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drivers/firmware/dmi_scan.c: fetch dmi version from SMBIOS if it exists
[linux/fpc-iii.git] / drivers / crypto / mv_cesa.c
blob24ccae453e7940c8e74c60c245072eb7754354cc
1 /*
2 * Support for Marvell's crypto engine which can be found on some Orion5X
3 * boards.
4 *
5 * Author: Sebastian Andrzej Siewior < sebastian at breakpoint dot cc >
6 * License: GPLv2
7 *
8 */
9 #include <crypto/aes.h>
10 #include <crypto/algapi.h>
11 #include <linux/crypto.h>
12 #include <linux/interrupt.h>
13 #include <linux/io.h>
14 #include <linux/kthread.h>
15 #include <linux/platform_device.h>
16 #include <linux/scatterlist.h>
17 #include <linux/slab.h>
18 #include <linux/module.h>
19 #include <linux/clk.h>
20 #include <crypto/internal/hash.h>
21 #include <crypto/sha.h>
22 #include <linux/of.h>
23 #include <linux/of_platform.h>
24 #include <linux/of_irq.h>
25
26 #include "mv_cesa.h"
27
28 #define MV_CESA "MV-CESA:"
29 #define MAX_HW_HASH_SIZE 0xFFFF
30 #define MV_CESA_EXPIRE 500 /* msec */
31
32 /*
33 * STM:
34 * /---------------------------------------\
35 * | | request complete
36 * \./ |
37 * IDLE -> new request -> BUSY -> done -> DEQUEUE
38 * /°\ |
39 * | | more scatter entries
40 * \________________/
41 */
42 enum engine_status {
43 ENGINE_IDLE,
44 ENGINE_BUSY,
45 ENGINE_W_DEQUEUE,
46 };
47
48 /**
49 * struct req_progress - used for every crypt request
50 * @src_sg_it: sg iterator for src
51 * @dst_sg_it: sg iterator for dst
52 * @sg_src_left: bytes left in src to process (scatter list)
53 * @src_start: offset to add to src start position (scatter list)
54 * @crypt_len: length of current hw crypt/hash process
55 * @hw_nbytes: total bytes to process in hw for this request
56 * @copy_back: whether to copy data back (crypt) or not (hash)
57 * @sg_dst_left: bytes left dst to process in this scatter list
58 * @dst_start: offset to add to dst start position (scatter list)
59 * @hw_processed_bytes: number of bytes processed by hw (request).
60 *
61 * sg helper are used to iterate over the scatterlist. Since the size of the
62 * SRAM may be less than the scatter size, this struct struct is used to keep
63 * track of progress within current scatterlist.
64 */
65 struct req_progress {
66 struct sg_mapping_iter src_sg_it;
67 struct sg_mapping_iter dst_sg_it;
68 void (*complete) (void);
69 void (*process) (int is_first);
70
71 /* src mostly */
72 int sg_src_left;
73 int src_start;
74 int crypt_len;
75 int hw_nbytes;
76 /* dst mostly */
77 int copy_back;
78 int sg_dst_left;
79 int dst_start;
80 int hw_processed_bytes;
81 };
82
83 struct crypto_priv {
84 void __iomem *reg;
85 void __iomem *sram;
86 int irq;
87 struct clk *clk;
88 struct task_struct *queue_th;
89
90 /* the lock protects queue and eng_st */
91 spinlock_t lock;
92 struct crypto_queue queue;
93 enum engine_status eng_st;
94 struct timer_list completion_timer;
95 struct crypto_async_request *cur_req;
96 struct req_progress p;
97 int max_req_size;
98 int sram_size;
99 int has_sha1;
100 int has_hmac_sha1;
101 };
102
103 static struct crypto_priv *cpg;
104
105 struct mv_ctx {
106 u8 aes_enc_key[AES_KEY_LEN];
107 u32 aes_dec_key[8];
108 int key_len;
109 u32 need_calc_aes_dkey;
110 };
111
112 enum crypto_op {
113 COP_AES_ECB,
114 COP_AES_CBC,
115 };
116
117 struct mv_req_ctx {
118 enum crypto_op op;
119 int decrypt;
120 };
121
122 enum hash_op {
123 COP_SHA1,
124 COP_HMAC_SHA1
125 };
126
127 struct mv_tfm_hash_ctx {
128 struct crypto_shash *fallback;
129 struct crypto_shash *base_hash;
130 u32 ivs[2 * SHA1_DIGEST_SIZE / 4];
131 int count_add;
132 enum hash_op op;
133 };
134
135 struct mv_req_hash_ctx {
136 u64 count;
137 u32 state[SHA1_DIGEST_SIZE / 4];
138 u8 buffer[SHA1_BLOCK_SIZE];
139 int first_hash; /* marks that we don't have previous state */
140 int last_chunk; /* marks that this is the 'final' request */
141 int extra_bytes; /* unprocessed bytes in buffer */
142 enum hash_op op;
143 int count_add;
144 };
145
146 static void mv_completion_timer_callback(unsigned long unused)
147 {
148 int active = readl(cpg->reg + SEC_ACCEL_CMD) & SEC_CMD_EN_SEC_ACCL0;
149
150 printk(KERN_ERR MV_CESA
151 "completion timer expired (CESA %sactive), cleaning up.\n",
152 active ? "" : "in");
153
154 del_timer(&cpg->completion_timer);
155 writel(SEC_CMD_DISABLE_SEC, cpg->reg + SEC_ACCEL_CMD);
156 while(readl(cpg->reg + SEC_ACCEL_CMD) & SEC_CMD_DISABLE_SEC)
157 printk(KERN_INFO MV_CESA "%s: waiting for engine finishing\n", __func__);
158 cpg->eng_st = ENGINE_W_DEQUEUE;
159 wake_up_process(cpg->queue_th);
160 }
161
162 static void mv_setup_timer(void)
163 {
164 setup_timer(&cpg->completion_timer, &mv_completion_timer_callback, 0);
165 mod_timer(&cpg->completion_timer,
166 jiffies + msecs_to_jiffies(MV_CESA_EXPIRE));
167 }
168
169 static void compute_aes_dec_key(struct mv_ctx *ctx)
170 {
171 struct crypto_aes_ctx gen_aes_key;
172 int key_pos;
173
174 if (!ctx->need_calc_aes_dkey)
175 return;
176
177 crypto_aes_expand_key(&gen_aes_key, ctx->aes_enc_key, ctx->key_len);
178
179 key_pos = ctx->key_len + 24;
180 memcpy(ctx->aes_dec_key, &gen_aes_key.key_enc[key_pos], 4 * 4);
181 switch (ctx->key_len) {
182 case AES_KEYSIZE_256:
183 key_pos -= 2;
184 /* fall */
185 case AES_KEYSIZE_192:
186 key_pos -= 2;
187 memcpy(&ctx->aes_dec_key[4], &gen_aes_key.key_enc[key_pos],
188 4 * 4);
189 break;
190 }
191 ctx->need_calc_aes_dkey = 0;
192 }
193
194 static int mv_setkey_aes(struct crypto_ablkcipher *cipher, const u8 *key,
195 unsigned int len)
196 {
197 struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
198 struct mv_ctx *ctx = crypto_tfm_ctx(tfm);
199
200 switch (len) {
201 case AES_KEYSIZE_128:
202 case AES_KEYSIZE_192:
203 case AES_KEYSIZE_256:
204 break;
205 default:
206 crypto_ablkcipher_set_flags(cipher, CRYPTO_TFM_RES_BAD_KEY_LEN);
207 return -EINVAL;
208 }
209 ctx->key_len = len;
210 ctx->need_calc_aes_dkey = 1;
211
212 memcpy(ctx->aes_enc_key, key, AES_KEY_LEN);
213 return 0;
214 }
215
216 static void copy_src_to_buf(struct req_progress *p, char *dbuf, int len)
217 {
218 int ret;
219 void *sbuf;
220 int copy_len;
221
222 while (len) {
223 if (!p->sg_src_left) {
224 ret = sg_miter_next(&p->src_sg_it);
225 BUG_ON(!ret);
226 p->sg_src_left = p->src_sg_it.length;
227 p->src_start = 0;
228 }
229
230 sbuf = p->src_sg_it.addr + p->src_start;
231
232 copy_len = min(p->sg_src_left, len);
233 memcpy(dbuf, sbuf, copy_len);
234
235 p->src_start += copy_len;
236 p->sg_src_left -= copy_len;
237
238 len -= copy_len;
239 dbuf += copy_len;
240 }
241 }
242
243 static void setup_data_in(void)
244 {
245 struct req_progress *p = &cpg->p;
246 int data_in_sram =
247 min(p->hw_nbytes - p->hw_processed_bytes, cpg->max_req_size);
248 copy_src_to_buf(p, cpg->sram + SRAM_DATA_IN_START + p->crypt_len,
249 data_in_sram - p->crypt_len);
250 p->crypt_len = data_in_sram;
251 }
252
253 static void mv_process_current_q(int first_block)
254 {
255 struct ablkcipher_request *req = ablkcipher_request_cast(cpg->cur_req);
256 struct mv_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
257 struct mv_req_ctx *req_ctx = ablkcipher_request_ctx(req);
258 struct sec_accel_config op;
259
260 switch (req_ctx->op) {
261 case COP_AES_ECB:
262 op.config = CFG_OP_CRYPT_ONLY | CFG_ENCM_AES | CFG_ENC_MODE_ECB;
263 break;
264 case COP_AES_CBC:
265 default:
266 op.config = CFG_OP_CRYPT_ONLY | CFG_ENCM_AES | CFG_ENC_MODE_CBC;
267 op.enc_iv = ENC_IV_POINT(SRAM_DATA_IV) |
268 ENC_IV_BUF_POINT(SRAM_DATA_IV_BUF);
269 if (first_block)
270 memcpy(cpg->sram + SRAM_DATA_IV, req->info, 16);
271 break;
272 }
273 if (req_ctx->decrypt) {
274 op.config |= CFG_DIR_DEC;
275 memcpy(cpg->sram + SRAM_DATA_KEY_P, ctx->aes_dec_key,
276 AES_KEY_LEN);
277 } else {
278 op.config |= CFG_DIR_ENC;
279 memcpy(cpg->sram + SRAM_DATA_KEY_P, ctx->aes_enc_key,
280 AES_KEY_LEN);
281 }
282
283 switch (ctx->key_len) {
284 case AES_KEYSIZE_128:
285 op.config |= CFG_AES_LEN_128;
286 break;
287 case AES_KEYSIZE_192:
288 op.config |= CFG_AES_LEN_192;
289 break;
290 case AES_KEYSIZE_256:
291 op.config |= CFG_AES_LEN_256;
292 break;
293 }
294 op.enc_p = ENC_P_SRC(SRAM_DATA_IN_START) |
295 ENC_P_DST(SRAM_DATA_OUT_START);
296 op.enc_key_p = SRAM_DATA_KEY_P;
297
298 setup_data_in();
299 op.enc_len = cpg->p.crypt_len;
300 memcpy(cpg->sram + SRAM_CONFIG, &op,
301 sizeof(struct sec_accel_config));
302
303 /* GO */
304 mv_setup_timer();
305 writel(SEC_CMD_EN_SEC_ACCL0, cpg->reg + SEC_ACCEL_CMD);
306 }
307
308 static void mv_crypto_algo_completion(void)
309 {
310 struct ablkcipher_request *req = ablkcipher_request_cast(cpg->cur_req);
311 struct mv_req_ctx *req_ctx = ablkcipher_request_ctx(req);
312
313 sg_miter_stop(&cpg->p.src_sg_it);
314 sg_miter_stop(&cpg->p.dst_sg_it);
315
316 if (req_ctx->op != COP_AES_CBC)
317 return ;
318
319 memcpy(req->info, cpg->sram + SRAM_DATA_IV_BUF, 16);
320 }
321
322 static void mv_process_hash_current(int first_block)
323 {
324 struct ahash_request *req = ahash_request_cast(cpg->cur_req);
325 const struct mv_tfm_hash_ctx *tfm_ctx = crypto_tfm_ctx(req->base.tfm);
326 struct mv_req_hash_ctx *req_ctx = ahash_request_ctx(req);
327 struct req_progress *p = &cpg->p;
328 struct sec_accel_config op = { 0 };
329 int is_last;
330
331 switch (req_ctx->op) {
332 case COP_SHA1:
333 default:
334 op.config = CFG_OP_MAC_ONLY | CFG_MACM_SHA1;
335 break;
336 case COP_HMAC_SHA1:
337 op.config = CFG_OP_MAC_ONLY | CFG_MACM_HMAC_SHA1;
338 memcpy(cpg->sram + SRAM_HMAC_IV_IN,
339 tfm_ctx->ivs, sizeof(tfm_ctx->ivs));
340 break;
341 }
342
343 op.mac_src_p =
344 MAC_SRC_DATA_P(SRAM_DATA_IN_START) | MAC_SRC_TOTAL_LEN((u32)
345 req_ctx->
346 count);
347
348 setup_data_in();
349
350 op.mac_digest =
351 MAC_DIGEST_P(SRAM_DIGEST_BUF) | MAC_FRAG_LEN(p->crypt_len);
352 op.mac_iv =
353 MAC_INNER_IV_P(SRAM_HMAC_IV_IN) |
354 MAC_OUTER_IV_P(SRAM_HMAC_IV_OUT);
355
356 is_last = req_ctx->last_chunk
357 && (p->hw_processed_bytes + p->crypt_len >= p->hw_nbytes)
358 && (req_ctx->count <= MAX_HW_HASH_SIZE);
359 if (req_ctx->first_hash) {
360 if (is_last)
361 op.config |= CFG_NOT_FRAG;
362 else
363 op.config |= CFG_FIRST_FRAG;
364
365 req_ctx->first_hash = 0;
366 } else {
367 if (is_last)
368 op.config |= CFG_LAST_FRAG;
369 else
370 op.config |= CFG_MID_FRAG;
371
372 if (first_block) {
373 writel(req_ctx->state[0], cpg->reg + DIGEST_INITIAL_VAL_A);
374 writel(req_ctx->state[1], cpg->reg + DIGEST_INITIAL_VAL_B);
375 writel(req_ctx->state[2], cpg->reg + DIGEST_INITIAL_VAL_C);
376 writel(req_ctx->state[3], cpg->reg + DIGEST_INITIAL_VAL_D);
377 writel(req_ctx->state[4], cpg->reg + DIGEST_INITIAL_VAL_E);
378 }
379 }
380
381 memcpy(cpg->sram + SRAM_CONFIG, &op, sizeof(struct sec_accel_config));
382
383 /* GO */
384 mv_setup_timer();
385 writel(SEC_CMD_EN_SEC_ACCL0, cpg->reg + SEC_ACCEL_CMD);
386 }
387
388 static inline int mv_hash_import_sha1_ctx(const struct mv_req_hash_ctx *ctx,
389 struct shash_desc *desc)
390 {
391 int i;
392 struct sha1_state shash_state;
393
394 shash_state.count = ctx->count + ctx->count_add;
395 for (i = 0; i < 5; i++)
396 shash_state.state[i] = ctx->state[i];
397 memcpy(shash_state.buffer, ctx->buffer, sizeof(shash_state.buffer));
398 return crypto_shash_import(desc, &shash_state);
399 }
400
401 static int mv_hash_final_fallback(struct ahash_request *req)
402 {
403 const struct mv_tfm_hash_ctx *tfm_ctx = crypto_tfm_ctx(req->base.tfm);
404 struct mv_req_hash_ctx *req_ctx = ahash_request_ctx(req);
405 struct {
406 struct shash_desc shash;
407 char ctx[crypto_shash_descsize(tfm_ctx->fallback)];
408 } desc;
409 int rc;
410
411 desc.shash.tfm = tfm_ctx->fallback;
412 desc.shash.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
413 if (unlikely(req_ctx->first_hash)) {
414 crypto_shash_init(&desc.shash);
415 crypto_shash_update(&desc.shash, req_ctx->buffer,
416 req_ctx->extra_bytes);
417 } else {
418 /* only SHA1 for now....
419 */
420 rc = mv_hash_import_sha1_ctx(req_ctx, &desc.shash);
421 if (rc)
422 goto out;
423 }
424 rc = crypto_shash_final(&desc.shash, req->result);
425 out:
426 return rc;
427 }
428
429 static void mv_save_digest_state(struct mv_req_hash_ctx *ctx)
430 {
431 ctx->state[0] = readl(cpg->reg + DIGEST_INITIAL_VAL_A);
432 ctx->state[1] = readl(cpg->reg + DIGEST_INITIAL_VAL_B);
433 ctx->state[2] = readl(cpg->reg + DIGEST_INITIAL_VAL_C);
434 ctx->state[3] = readl(cpg->reg + DIGEST_INITIAL_VAL_D);
435 ctx->state[4] = readl(cpg->reg + DIGEST_INITIAL_VAL_E);
436 }
437
438 static void mv_hash_algo_completion(void)
439 {
440 struct ahash_request *req = ahash_request_cast(cpg->cur_req);
441 struct mv_req_hash_ctx *ctx = ahash_request_ctx(req);
442
443 if (ctx->extra_bytes)
444 copy_src_to_buf(&cpg->p, ctx->buffer, ctx->extra_bytes);
445 sg_miter_stop(&cpg->p.src_sg_it);
446
447 if (likely(ctx->last_chunk)) {
448 if (likely(ctx->count <= MAX_HW_HASH_SIZE)) {
449 memcpy(req->result, cpg->sram + SRAM_DIGEST_BUF,
450 crypto_ahash_digestsize(crypto_ahash_reqtfm
451 (req)));
452 } else {
453 mv_save_digest_state(ctx);
454 mv_hash_final_fallback(req);
455 }
456 } else {
457 mv_save_digest_state(ctx);
458 }
459 }
460
461 static void dequeue_complete_req(void)
462 {
463 struct crypto_async_request *req = cpg->cur_req;
464 void *buf;
465 int ret;
466 cpg->p.hw_processed_bytes += cpg->p.crypt_len;
467 if (cpg->p.copy_back) {
468 int need_copy_len = cpg->p.crypt_len;
469 int sram_offset = 0;
470 do {
471 int dst_copy;
472
473 if (!cpg->p.sg_dst_left) {
474 ret = sg_miter_next(&cpg->p.dst_sg_it);
475 BUG_ON(!ret);
476 cpg->p.sg_dst_left = cpg->p.dst_sg_it.length;
477 cpg->p.dst_start = 0;
478 }
479
480 buf = cpg->p.dst_sg_it.addr;
481 buf += cpg->p.dst_start;
482
483 dst_copy = min(need_copy_len, cpg->p.sg_dst_left);
484
485 memcpy(buf,
486 cpg->sram + SRAM_DATA_OUT_START + sram_offset,
487 dst_copy);
488 sram_offset += dst_copy;
489 cpg->p.sg_dst_left -= dst_copy;
490 need_copy_len -= dst_copy;
491 cpg->p.dst_start += dst_copy;
492 } while (need_copy_len > 0);
493 }
494
495 cpg->p.crypt_len = 0;
496
497 BUG_ON(cpg->eng_st != ENGINE_W_DEQUEUE);
498 if (cpg->p.hw_processed_bytes < cpg->p.hw_nbytes) {
499 /* process next scatter list entry */
500 cpg->eng_st = ENGINE_BUSY;
501 cpg->p.process(0);
502 } else {
503 cpg->p.complete();
504 cpg->eng_st = ENGINE_IDLE;
505 local_bh_disable();
506 req->complete(req, 0);
507 local_bh_enable();
508 }
509 }
510
511 static int count_sgs(struct scatterlist *sl, unsigned int total_bytes)
512 {
513 int i = 0;
514 size_t cur_len;
515
516 while (sl) {
517 cur_len = sl[i].length;
518 ++i;
519 if (total_bytes > cur_len)
520 total_bytes -= cur_len;
521 else
522 break;
523 }
524
525 return i;
526 }
527
528 static void mv_start_new_crypt_req(struct ablkcipher_request *req)
529 {
530 struct req_progress *p = &cpg->p;
531 int num_sgs;
532
533 cpg->cur_req = &req->base;
534 memset(p, 0, sizeof(struct req_progress));
535 p->hw_nbytes = req->nbytes;
536 p->complete = mv_crypto_algo_completion;
537 p->process = mv_process_current_q;
538 p->copy_back = 1;
539
540 num_sgs = count_sgs(req->src, req->nbytes);
541 sg_miter_start(&p->src_sg_it, req->src, num_sgs, SG_MITER_FROM_SG);
542
543 num_sgs = count_sgs(req->dst, req->nbytes);
544 sg_miter_start(&p->dst_sg_it, req->dst, num_sgs, SG_MITER_TO_SG);
545
546 mv_process_current_q(1);
547 }
548
549 static void mv_start_new_hash_req(struct ahash_request *req)
550 {
551 struct req_progress *p = &cpg->p;
552 struct mv_req_hash_ctx *ctx = ahash_request_ctx(req);
553 int num_sgs, hw_bytes, old_extra_bytes, rc;
554 cpg->cur_req = &req->base;
555 memset(p, 0, sizeof(struct req_progress));
556 hw_bytes = req->nbytes + ctx->extra_bytes;
557 old_extra_bytes = ctx->extra_bytes;
558
559 ctx->extra_bytes = hw_bytes % SHA1_BLOCK_SIZE;
560 if (ctx->extra_bytes != 0
561 && (!ctx->last_chunk || ctx->count > MAX_HW_HASH_SIZE))
562 hw_bytes -= ctx->extra_bytes;
563 else
564 ctx->extra_bytes = 0;
565
566 num_sgs = count_sgs(req->src, req->nbytes);
567 sg_miter_start(&p->src_sg_it, req->src, num_sgs, SG_MITER_FROM_SG);
568
569 if (hw_bytes) {
570 p->hw_nbytes = hw_bytes;
571 p->complete = mv_hash_algo_completion;
572 p->process = mv_process_hash_current;
573
574 if (unlikely(old_extra_bytes)) {
575 memcpy(cpg->sram + SRAM_DATA_IN_START, ctx->buffer,
576 old_extra_bytes);
577 p->crypt_len = old_extra_bytes;
578 }
579
580 mv_process_hash_current(1);
581 } else {
582 copy_src_to_buf(p, ctx->buffer + old_extra_bytes,
583 ctx->extra_bytes - old_extra_bytes);
584 sg_miter_stop(&p->src_sg_it);
585 if (ctx->last_chunk)
586 rc = mv_hash_final_fallback(req);
587 else
588 rc = 0;
589 cpg->eng_st = ENGINE_IDLE;
590 local_bh_disable();
591 req->base.complete(&req->base, rc);
592 local_bh_enable();
593 }
594 }
595
596 static int queue_manag(void *data)
597 {
598 cpg->eng_st = ENGINE_IDLE;
599 do {
600 struct crypto_async_request *async_req = NULL;
601 struct crypto_async_request *backlog;
602
603 __set_current_state(TASK_INTERRUPTIBLE);
604
605 if (cpg->eng_st == ENGINE_W_DEQUEUE)
606 dequeue_complete_req();
607
608 spin_lock_irq(&cpg->lock);
609 if (cpg->eng_st == ENGINE_IDLE) {
610 backlog = crypto_get_backlog(&cpg->queue);
611 async_req = crypto_dequeue_request(&cpg->queue);
612 if (async_req) {
613 BUG_ON(cpg->eng_st != ENGINE_IDLE);
614 cpg->eng_st = ENGINE_BUSY;
615 }
616 }
617 spin_unlock_irq(&cpg->lock);
618
619 if (backlog) {
620 backlog->complete(backlog, -EINPROGRESS);
621 backlog = NULL;
622 }
623
624 if (async_req) {
625 if (async_req->tfm->__crt_alg->cra_type !=
626 &crypto_ahash_type) {
627 struct ablkcipher_request *req =
628 ablkcipher_request_cast(async_req);
629 mv_start_new_crypt_req(req);
630 } else {
631 struct ahash_request *req =
632 ahash_request_cast(async_req);
633 mv_start_new_hash_req(req);
634 }
635 async_req = NULL;
636 }
637
638 schedule();
639
640 } while (!kthread_should_stop());
641 return 0;
642 }
643
644 static int mv_handle_req(struct crypto_async_request *req)
645 {
646 unsigned long flags;
647 int ret;
648
649 spin_lock_irqsave(&cpg->lock, flags);
650 ret = crypto_enqueue_request(&cpg->queue, req);
651 spin_unlock_irqrestore(&cpg->lock, flags);
652 wake_up_process(cpg->queue_th);
653 return ret;
654 }
655
656 static int mv_enc_aes_ecb(struct ablkcipher_request *req)
657 {
658 struct mv_req_ctx *req_ctx = ablkcipher_request_ctx(req);
659
660 req_ctx->op = COP_AES_ECB;
661 req_ctx->decrypt = 0;
662
663 return mv_handle_req(&req->base);
664 }
665
666 static int mv_dec_aes_ecb(struct ablkcipher_request *req)
667 {
668 struct mv_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
669 struct mv_req_ctx *req_ctx = ablkcipher_request_ctx(req);
670
671 req_ctx->op = COP_AES_ECB;
672 req_ctx->decrypt = 1;
673
674 compute_aes_dec_key(ctx);
675 return mv_handle_req(&req->base);
676 }
677
678 static int mv_enc_aes_cbc(struct ablkcipher_request *req)
679 {
680 struct mv_req_ctx *req_ctx = ablkcipher_request_ctx(req);
681
682 req_ctx->op = COP_AES_CBC;
683 req_ctx->decrypt = 0;
684
685 return mv_handle_req(&req->base);
686 }
687
688 static int mv_dec_aes_cbc(struct ablkcipher_request *req)
689 {
690 struct mv_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
691 struct mv_req_ctx *req_ctx = ablkcipher_request_ctx(req);
692
693 req_ctx->op = COP_AES_CBC;
694 req_ctx->decrypt = 1;
695
696 compute_aes_dec_key(ctx);
697 return mv_handle_req(&req->base);
698 }
699
700 static int mv_cra_init(struct crypto_tfm *tfm)
701 {
702 tfm->crt_ablkcipher.reqsize = sizeof(struct mv_req_ctx);
703 return 0;
704 }
705
706 static void mv_init_hash_req_ctx(struct mv_req_hash_ctx *ctx, int op,
707 int is_last, unsigned int req_len,
708 int count_add)
709 {
710 memset(ctx, 0, sizeof(*ctx));
711 ctx->op = op;
712 ctx->count = req_len;
713 ctx->first_hash = 1;
714 ctx->last_chunk = is_last;
715 ctx->count_add = count_add;
716 }
717
718 static void mv_update_hash_req_ctx(struct mv_req_hash_ctx *ctx, int is_last,
719 unsigned req_len)
720 {
721 ctx->last_chunk = is_last;
722 ctx->count += req_len;
723 }
724
725 static int mv_hash_init(struct ahash_request *req)
726 {
727 const struct mv_tfm_hash_ctx *tfm_ctx = crypto_tfm_ctx(req->base.tfm);
728 mv_init_hash_req_ctx(ahash_request_ctx(req), tfm_ctx->op, 0, 0,
729 tfm_ctx->count_add);
730 return 0;
731 }
732
733 static int mv_hash_update(struct ahash_request *req)
734 {
735 if (!req->nbytes)
736 return 0;
737
738 mv_update_hash_req_ctx(ahash_request_ctx(req), 0, req->nbytes);
739 return mv_handle_req(&req->base);
740 }
741
742 static int mv_hash_final(struct ahash_request *req)
743 {
744 struct mv_req_hash_ctx *ctx = ahash_request_ctx(req);
745
746 ahash_request_set_crypt(req, NULL, req->result, 0);
747 mv_update_hash_req_ctx(ctx, 1, 0);
748 return mv_handle_req(&req->base);
749 }
750
751 static int mv_hash_finup(struct ahash_request *req)
752 {
753 mv_update_hash_req_ctx(ahash_request_ctx(req), 1, req->nbytes);
754 return mv_handle_req(&req->base);
755 }
756
757 static int mv_hash_digest(struct ahash_request *req)
758 {
759 const struct mv_tfm_hash_ctx *tfm_ctx = crypto_tfm_ctx(req->base.tfm);
760 mv_init_hash_req_ctx(ahash_request_ctx(req), tfm_ctx->op, 1,
761 req->nbytes, tfm_ctx->count_add);
762 return mv_handle_req(&req->base);
763 }
764
765 static void mv_hash_init_ivs(struct mv_tfm_hash_ctx *ctx, const void *istate,
766 const void *ostate)
767 {
768 const struct sha1_state *isha1_state = istate, *osha1_state = ostate;
769 int i;
770 for (i = 0; i < 5; i++) {
771 ctx->ivs[i] = cpu_to_be32(isha1_state->state[i]);
772 ctx->ivs[i + 5] = cpu_to_be32(osha1_state->state[i]);
773 }
774 }
775
776 static int mv_hash_setkey(struct crypto_ahash *tfm, const u8 * key,
777 unsigned int keylen)
778 {
779 int rc;
780 struct mv_tfm_hash_ctx *ctx = crypto_tfm_ctx(&tfm->base);
781 int bs, ds, ss;
782
783 if (!ctx->base_hash)
784 return 0;
785
786 rc = crypto_shash_setkey(ctx->fallback, key, keylen);
787 if (rc)
788 return rc;
789
790 /* Can't see a way to extract the ipad/opad from the fallback tfm
791 so I'm basically copying code from the hmac module */
792 bs = crypto_shash_blocksize(ctx->base_hash);
793 ds = crypto_shash_digestsize(ctx->base_hash);
794 ss = crypto_shash_statesize(ctx->base_hash);
795
796 {
797 struct {
798 struct shash_desc shash;
799 char ctx[crypto_shash_descsize(ctx->base_hash)];
800 } desc;
801 unsigned int i;
802 char ipad[ss];
803 char opad[ss];
804
805 desc.shash.tfm = ctx->base_hash;
806 desc.shash.flags = crypto_shash_get_flags(ctx->base_hash) &
807 CRYPTO_TFM_REQ_MAY_SLEEP;
808
809 if (keylen > bs) {
810 int err;
811
812 err =
813 crypto_shash_digest(&desc.shash, key, keylen, ipad);
814 if (err)
815 return err;
816
817 keylen = ds;
818 } else
819 memcpy(ipad, key, keylen);
820
821 memset(ipad + keylen, 0, bs - keylen);
822 memcpy(opad, ipad, bs);
823
824 for (i = 0; i < bs; i++) {
825 ipad[i] ^= 0x36;
826 opad[i] ^= 0x5c;
827 }
828
829 rc = crypto_shash_init(&desc.shash) ? :
830 crypto_shash_update(&desc.shash, ipad, bs) ? :
831 crypto_shash_export(&desc.shash, ipad) ? :
832 crypto_shash_init(&desc.shash) ? :
833 crypto_shash_update(&desc.shash, opad, bs) ? :
834 crypto_shash_export(&desc.shash, opad);
835
836 if (rc == 0)
837 mv_hash_init_ivs(ctx, ipad, opad);
838
839 return rc;
840 }
841 }
842
843 static int mv_cra_hash_init(struct crypto_tfm *tfm, const char *base_hash_name,
844 enum hash_op op, int count_add)
845 {
846 const char *fallback_driver_name = tfm->__crt_alg->cra_name;
847 struct mv_tfm_hash_ctx *ctx = crypto_tfm_ctx(tfm);
848 struct crypto_shash *fallback_tfm = NULL;
849 struct crypto_shash *base_hash = NULL;
850 int err = -ENOMEM;
851
852 ctx->op = op;
853 ctx->count_add = count_add;
854
855 /* Allocate a fallback and abort if it failed. */
856 fallback_tfm = crypto_alloc_shash(fallback_driver_name, 0,
857 CRYPTO_ALG_NEED_FALLBACK);
858 if (IS_ERR(fallback_tfm)) {
859 printk(KERN_WARNING MV_CESA
860 "Fallback driver '%s' could not be loaded!\n",
861 fallback_driver_name);
862 err = PTR_ERR(fallback_tfm);
863 goto out;
864 }
865 ctx->fallback = fallback_tfm;
866
867 if (base_hash_name) {
868 /* Allocate a hash to compute the ipad/opad of hmac. */
869 base_hash = crypto_alloc_shash(base_hash_name, 0,
870 CRYPTO_ALG_NEED_FALLBACK);
871 if (IS_ERR(base_hash)) {
872 printk(KERN_WARNING MV_CESA
873 "Base driver '%s' could not be loaded!\n",
874 base_hash_name);
875 err = PTR_ERR(base_hash);
876 goto err_bad_base;
877 }
878 }
879 ctx->base_hash = base_hash;
880
881 crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
882 sizeof(struct mv_req_hash_ctx) +
883 crypto_shash_descsize(ctx->fallback));
884 return 0;
885 err_bad_base:
886 crypto_free_shash(fallback_tfm);
887 out:
888 return err;
889 }
890
891 static void mv_cra_hash_exit(struct crypto_tfm *tfm)
892 {
893 struct mv_tfm_hash_ctx *ctx = crypto_tfm_ctx(tfm);
894
895 crypto_free_shash(ctx->fallback);
896 if (ctx->base_hash)
897 crypto_free_shash(ctx->base_hash);
898 }
899
900 static int mv_cra_hash_sha1_init(struct crypto_tfm *tfm)
901 {
902 return mv_cra_hash_init(tfm, NULL, COP_SHA1, 0);
903 }
904
905 static int mv_cra_hash_hmac_sha1_init(struct crypto_tfm *tfm)
906 {
907 return mv_cra_hash_init(tfm, "sha1", COP_HMAC_SHA1, SHA1_BLOCK_SIZE);
908 }
909
910 irqreturn_t crypto_int(int irq, void *priv)
911 {
912 u32 val;
913
914 val = readl(cpg->reg + SEC_ACCEL_INT_STATUS);
915 if (!(val & SEC_INT_ACCEL0_DONE))
916 return IRQ_NONE;
917
918 if (!del_timer(&cpg->completion_timer)) {
919 printk(KERN_WARNING MV_CESA
920 "got an interrupt but no pending timer?\n");
921 }
922 val &= ~SEC_INT_ACCEL0_DONE;
923 writel(val, cpg->reg + FPGA_INT_STATUS);
924 writel(val, cpg->reg + SEC_ACCEL_INT_STATUS);
925 BUG_ON(cpg->eng_st != ENGINE_BUSY);
926 cpg->eng_st = ENGINE_W_DEQUEUE;
927 wake_up_process(cpg->queue_th);
928 return IRQ_HANDLED;
929 }
930
931 struct crypto_alg mv_aes_alg_ecb = {
932 .cra_name = "ecb(aes)",
933 .cra_driver_name = "mv-ecb-aes",
934 .cra_priority = 300,
935 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
936 CRYPTO_ALG_KERN_DRIVER_ONLY | CRYPTO_ALG_ASYNC,
937 .cra_blocksize = 16,
938 .cra_ctxsize = sizeof(struct mv_ctx),
939 .cra_alignmask = 0,
940 .cra_type = &crypto_ablkcipher_type,
941 .cra_module = THIS_MODULE,
942 .cra_init = mv_cra_init,
943 .cra_u = {
944 .ablkcipher = {
945 .min_keysize = AES_MIN_KEY_SIZE,
946 .max_keysize = AES_MAX_KEY_SIZE,
947 .setkey = mv_setkey_aes,
948 .encrypt = mv_enc_aes_ecb,
949 .decrypt = mv_dec_aes_ecb,
950 },
951 },
952 };
953
954 struct crypto_alg mv_aes_alg_cbc = {
955 .cra_name = "cbc(aes)",
956 .cra_driver_name = "mv-cbc-aes",
957 .cra_priority = 300,
958 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
959 CRYPTO_ALG_KERN_DRIVER_ONLY | CRYPTO_ALG_ASYNC,
960 .cra_blocksize = AES_BLOCK_SIZE,
961 .cra_ctxsize = sizeof(struct mv_ctx),
962 .cra_alignmask = 0,
963 .cra_type = &crypto_ablkcipher_type,
964 .cra_module = THIS_MODULE,
965 .cra_init = mv_cra_init,
966 .cra_u = {
967 .ablkcipher = {
968 .ivsize = AES_BLOCK_SIZE,
969 .min_keysize = AES_MIN_KEY_SIZE,
970 .max_keysize = AES_MAX_KEY_SIZE,
971 .setkey = mv_setkey_aes,
972 .encrypt = mv_enc_aes_cbc,
973 .decrypt = mv_dec_aes_cbc,
974 },
975 },
976 };
977
978 struct ahash_alg mv_sha1_alg = {
979 .init = mv_hash_init,
980 .update = mv_hash_update,
981 .final = mv_hash_final,
982 .finup = mv_hash_finup,
983 .digest = mv_hash_digest,
984 .halg = {
985 .digestsize = SHA1_DIGEST_SIZE,
986 .base = {
987 .cra_name = "sha1",
988 .cra_driver_name = "mv-sha1",
989 .cra_priority = 300,
990 .cra_flags =
991 CRYPTO_ALG_ASYNC | CRYPTO_ALG_KERN_DRIVER_ONLY |
992 CRYPTO_ALG_NEED_FALLBACK,
993 .cra_blocksize = SHA1_BLOCK_SIZE,
994 .cra_ctxsize = sizeof(struct mv_tfm_hash_ctx),
995 .cra_init = mv_cra_hash_sha1_init,
996 .cra_exit = mv_cra_hash_exit,
997 .cra_module = THIS_MODULE,
998 }
999 }
1000 };
1001
1002 struct ahash_alg mv_hmac_sha1_alg = {
1003 .init = mv_hash_init,
1004 .update = mv_hash_update,
1005 .final = mv_hash_final,
1006 .finup = mv_hash_finup,
1007 .digest = mv_hash_digest,
1008 .setkey = mv_hash_setkey,
1009 .halg = {
1010 .digestsize = SHA1_DIGEST_SIZE,
1011 .base = {
1012 .cra_name = "hmac(sha1)",
1013 .cra_driver_name = "mv-hmac-sha1",
1014 .cra_priority = 300,
1015 .cra_flags =
1016 CRYPTO_ALG_ASYNC | CRYPTO_ALG_KERN_DRIVER_ONLY |
1017 CRYPTO_ALG_NEED_FALLBACK,
1018 .cra_blocksize = SHA1_BLOCK_SIZE,
1019 .cra_ctxsize = sizeof(struct mv_tfm_hash_ctx),
1020 .cra_init = mv_cra_hash_hmac_sha1_init,
1021 .cra_exit = mv_cra_hash_exit,
1022 .cra_module = THIS_MODULE,
1023 }
1024 }
1025 };
1026
1027 static int mv_probe(struct platform_device *pdev)
1028 {
1029 struct crypto_priv *cp;
1030 struct resource *res;
1031 int irq;
1032 int ret;
1033
1034 if (cpg) {
1035 printk(KERN_ERR MV_CESA "Second crypto dev?\n");
1036 return -EEXIST;
1037 }
1038
1039 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
1040 if (!res)
1041 return -ENXIO;
1042
1043 cp = kzalloc(sizeof(*cp), GFP_KERNEL);
1044 if (!cp)
1045 return -ENOMEM;
1046
1047 spin_lock_init(&cp->lock);
1048 crypto_init_queue(&cp->queue, 50);
1049 cp->reg = ioremap(res->start, resource_size(res));
1050 if (!cp->reg) {
1051 ret = -ENOMEM;
1052 goto err;
1053 }
1054
1055 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "sram");
1056 if (!res) {
1057 ret = -ENXIO;
1058 goto err_unmap_reg;
1059 }
1060 cp->sram_size = resource_size(res);
1061 cp->max_req_size = cp->sram_size - SRAM_CFG_SPACE;
1062 cp->sram = ioremap(res->start, cp->sram_size);
1063 if (!cp->sram) {
1064 ret = -ENOMEM;
1065 goto err_unmap_reg;
1066 }
1067
1068 if (pdev->dev.of_node)
1069 irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
1070 else
1071 irq = platform_get_irq(pdev, 0);
1072 if (irq < 0 || irq == NO_IRQ) {
1073 ret = irq;
1074 goto err_unmap_sram;
1075 }
1076 cp->irq = irq;
1077
1078 platform_set_drvdata(pdev, cp);
1079 cpg = cp;
1080
1081 cp->queue_th = kthread_run(queue_manag, cp, "mv_crypto");
1082 if (IS_ERR(cp->queue_th)) {
1083 ret = PTR_ERR(cp->queue_th);
1084 goto err_unmap_sram;
1085 }
1086
1087 ret = request_irq(irq, crypto_int, IRQF_DISABLED, dev_name(&pdev->dev),
1088 cp);
1089 if (ret)
1090 goto err_thread;
1091
1092 /* Not all platforms can gate the clock, so it is not
1093 an error if the clock does not exists. */
1094 cp->clk = clk_get(&pdev->dev, NULL);
1095 if (!IS_ERR(cp->clk))
1096 clk_prepare_enable(cp->clk);
1097
1098 writel(0, cpg->reg + SEC_ACCEL_INT_STATUS);
1099 writel(SEC_INT_ACCEL0_DONE, cpg->reg + SEC_ACCEL_INT_MASK);
1100 writel(SEC_CFG_STOP_DIG_ERR, cpg->reg + SEC_ACCEL_CFG);
1101 writel(SRAM_CONFIG, cpg->reg + SEC_ACCEL_DESC_P0);
1102
1103 ret = crypto_register_alg(&mv_aes_alg_ecb);
1104 if (ret) {
1105 printk(KERN_WARNING MV_CESA
1106 "Could not register aes-ecb driver\n");
1107 goto err_irq;
1108 }
1109
1110 ret = crypto_register_alg(&mv_aes_alg_cbc);
1111 if (ret) {
1112 printk(KERN_WARNING MV_CESA
1113 "Could not register aes-cbc driver\n");
1114 goto err_unreg_ecb;
1115 }
1116
1117 ret = crypto_register_ahash(&mv_sha1_alg);
1118 if (ret == 0)
1119 cpg->has_sha1 = 1;
1120 else
1121 printk(KERN_WARNING MV_CESA "Could not register sha1 driver\n");
1122
1123 ret = crypto_register_ahash(&mv_hmac_sha1_alg);
1124 if (ret == 0) {
1125 cpg->has_hmac_sha1 = 1;
1126 } else {
1127 printk(KERN_WARNING MV_CESA
1128 "Could not register hmac-sha1 driver\n");
1129 }
1130
1131 return 0;
1132 err_unreg_ecb:
1133 crypto_unregister_alg(&mv_aes_alg_ecb);
1134 err_irq:
1135 free_irq(irq, cp);
1136 if (!IS_ERR(cp->clk)) {
1137 clk_disable_unprepare(cp->clk);
1138 clk_put(cp->clk);
1139 }
1140 err_thread:
1141 kthread_stop(cp->queue_th);
1142 err_unmap_sram:
1143 iounmap(cp->sram);
1144 err_unmap_reg:
1145 iounmap(cp->reg);
1146 err:
1147 kfree(cp);
1148 cpg = NULL;
1149 platform_set_drvdata(pdev, NULL);
1150 return ret;
1151 }
1152
1153 static int mv_remove(struct platform_device *pdev)
1154 {
1155 struct crypto_priv *cp = platform_get_drvdata(pdev);
1156
1157 crypto_unregister_alg(&mv_aes_alg_ecb);
1158 crypto_unregister_alg(&mv_aes_alg_cbc);
1159 if (cp->has_sha1)
1160 crypto_unregister_ahash(&mv_sha1_alg);
1161 if (cp->has_hmac_sha1)
1162 crypto_unregister_ahash(&mv_hmac_sha1_alg);
1163 kthread_stop(cp->queue_th);
1164 free_irq(cp->irq, cp);
1165 memset(cp->sram, 0, cp->sram_size);
1166 iounmap(cp->sram);
1167 iounmap(cp->reg);
1168
1169 if (!IS_ERR(cp->clk)) {
1170 clk_disable_unprepare(cp->clk);
1171 clk_put(cp->clk);
1172 }
1173
1174 kfree(cp);
1175 cpg = NULL;
1176 return 0;
1177 }
1178
1179 static const struct of_device_id mv_cesa_of_match_table[] = {
1180 { .compatible = "marvell,orion-crypto", },
1181 {}
1182 };
1183 MODULE_DEVICE_TABLE(of, mv_cesa_of_match_table);
1184
1185 static struct platform_driver marvell_crypto = {
1186 .probe = mv_probe,
1187 .remove = __devexit_p(mv_remove),
1188 .driver = {
1189 .owner = THIS_MODULE,
1190 .name = "mv_crypto",
1191 .of_match_table = of_match_ptr(mv_cesa_of_match_table),
1192 },
1193 };
1194 MODULE_ALIAS("platform:mv_crypto");
1195
1196 module_platform_driver(marvell_crypto);
1197
1198 MODULE_AUTHOR("Sebastian Andrzej Siewior <sebastian@breakpoint.cc>");
1199 MODULE_DESCRIPTION("Support for Marvell's cryptographic engine");
1200 MODULE_LICENSE("GPL");
Linux with added FPC-III support