forked from torvalds/linux
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathatmel-tdes.c
1309 lines (1058 loc) · 30.8 KB
/
atmel-tdes.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
// SPDX-License-Identifier: GPL-2.0
/*
* Cryptographic API.
*
* Support for ATMEL DES/TDES HW acceleration.
*
* Copyright (c) 2012 Eukréa Electromatique - ATMEL
* Author: Nicolas Royer <[email protected]>
*
* Some ideas are from omap-aes.c drivers.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/hw_random.h>
#include <linux/platform_device.h>
#include <linux/device.h>
#include <linux/dmaengine.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/scatterlist.h>
#include <linux/dma-mapping.h>
#include <linux/of_device.h>
#include <linux/delay.h>
#include <linux/crypto.h>
#include <crypto/scatterwalk.h>
#include <crypto/algapi.h>
#include <crypto/internal/des.h>
#include <crypto/internal/skcipher.h>
#include "atmel-tdes-regs.h"
#define ATMEL_TDES_PRIORITY 300
/* TDES flags */
/* Reserve bits [17:16], [13:12], [2:0] for AES Mode Register */
#define TDES_FLAGS_ENCRYPT TDES_MR_CYPHER_ENC
#define TDES_FLAGS_OPMODE_MASK (TDES_MR_OPMOD_MASK | TDES_MR_CFBS_MASK)
#define TDES_FLAGS_ECB TDES_MR_OPMOD_ECB
#define TDES_FLAGS_CBC TDES_MR_OPMOD_CBC
#define TDES_FLAGS_OFB TDES_MR_OPMOD_OFB
#define TDES_FLAGS_CFB64 (TDES_MR_OPMOD_CFB | TDES_MR_CFBS_64b)
#define TDES_FLAGS_CFB32 (TDES_MR_OPMOD_CFB | TDES_MR_CFBS_32b)
#define TDES_FLAGS_CFB16 (TDES_MR_OPMOD_CFB | TDES_MR_CFBS_16b)
#define TDES_FLAGS_CFB8 (TDES_MR_OPMOD_CFB | TDES_MR_CFBS_8b)
#define TDES_FLAGS_MODE_MASK (TDES_FLAGS_OPMODE_MASK | TDES_FLAGS_ENCRYPT)
#define TDES_FLAGS_INIT BIT(3)
#define TDES_FLAGS_FAST BIT(4)
#define TDES_FLAGS_BUSY BIT(5)
#define TDES_FLAGS_DMA BIT(6)
#define ATMEL_TDES_QUEUE_LENGTH 50
#define CFB8_BLOCK_SIZE 1
#define CFB16_BLOCK_SIZE 2
#define CFB32_BLOCK_SIZE 4
struct atmel_tdes_caps {
bool has_dma;
u32 has_cfb_3keys;
};
struct atmel_tdes_dev;
struct atmel_tdes_ctx {
struct atmel_tdes_dev *dd;
int keylen;
u32 key[DES3_EDE_KEY_SIZE / sizeof(u32)];
unsigned long flags;
u16 block_size;
};
struct atmel_tdes_reqctx {
unsigned long mode;
u8 lastc[DES_BLOCK_SIZE];
};
struct atmel_tdes_dma {
struct dma_chan *chan;
struct dma_slave_config dma_conf;
};
struct atmel_tdes_dev {
struct list_head list;
unsigned long phys_base;
void __iomem *io_base;
struct atmel_tdes_ctx *ctx;
struct device *dev;
struct clk *iclk;
int irq;
unsigned long flags;
spinlock_t lock;
struct crypto_queue queue;
struct tasklet_struct done_task;
struct tasklet_struct queue_task;
struct skcipher_request *req;
size_t total;
struct scatterlist *in_sg;
unsigned int nb_in_sg;
size_t in_offset;
struct scatterlist *out_sg;
unsigned int nb_out_sg;
size_t out_offset;
size_t buflen;
size_t dma_size;
void *buf_in;
int dma_in;
dma_addr_t dma_addr_in;
struct atmel_tdes_dma dma_lch_in;
void *buf_out;
int dma_out;
dma_addr_t dma_addr_out;
struct atmel_tdes_dma dma_lch_out;
struct atmel_tdes_caps caps;
u32 hw_version;
};
struct atmel_tdes_drv {
struct list_head dev_list;
spinlock_t lock;
};
static struct atmel_tdes_drv atmel_tdes = {
.dev_list = LIST_HEAD_INIT(atmel_tdes.dev_list),
.lock = __SPIN_LOCK_UNLOCKED(atmel_tdes.lock),
};
static int atmel_tdes_sg_copy(struct scatterlist **sg, size_t *offset,
void *buf, size_t buflen, size_t total, int out)
{
size_t count, off = 0;
while (buflen && total) {
count = min((*sg)->length - *offset, total);
count = min(count, buflen);
if (!count)
return off;
scatterwalk_map_and_copy(buf + off, *sg, *offset, count, out);
off += count;
buflen -= count;
*offset += count;
total -= count;
if (*offset == (*sg)->length) {
*sg = sg_next(*sg);
if (*sg)
*offset = 0;
else
total = 0;
}
}
return off;
}
static inline u32 atmel_tdes_read(struct atmel_tdes_dev *dd, u32 offset)
{
return readl_relaxed(dd->io_base + offset);
}
static inline void atmel_tdes_write(struct atmel_tdes_dev *dd,
u32 offset, u32 value)
{
writel_relaxed(value, dd->io_base + offset);
}
static void atmel_tdes_write_n(struct atmel_tdes_dev *dd, u32 offset,
const u32 *value, int count)
{
for (; count--; value++, offset += 4)
atmel_tdes_write(dd, offset, *value);
}
static struct atmel_tdes_dev *atmel_tdes_find_dev(struct atmel_tdes_ctx *ctx)
{
struct atmel_tdes_dev *tdes_dd = NULL;
struct atmel_tdes_dev *tmp;
spin_lock_bh(&atmel_tdes.lock);
if (!ctx->dd) {
list_for_each_entry(tmp, &atmel_tdes.dev_list, list) {
tdes_dd = tmp;
break;
}
ctx->dd = tdes_dd;
} else {
tdes_dd = ctx->dd;
}
spin_unlock_bh(&atmel_tdes.lock);
return tdes_dd;
}
static int atmel_tdes_hw_init(struct atmel_tdes_dev *dd)
{
int err;
err = clk_prepare_enable(dd->iclk);
if (err)
return err;
if (!(dd->flags & TDES_FLAGS_INIT)) {
atmel_tdes_write(dd, TDES_CR, TDES_CR_SWRST);
dd->flags |= TDES_FLAGS_INIT;
}
return 0;
}
static inline unsigned int atmel_tdes_get_version(struct atmel_tdes_dev *dd)
{
return atmel_tdes_read(dd, TDES_HW_VERSION) & 0x00000fff;
}
static int atmel_tdes_hw_version_init(struct atmel_tdes_dev *dd)
{
int err;
err = atmel_tdes_hw_init(dd);
if (err)
return err;
dd->hw_version = atmel_tdes_get_version(dd);
dev_info(dd->dev,
"version: 0x%x\n", dd->hw_version);
clk_disable_unprepare(dd->iclk);
return 0;
}
static void atmel_tdes_dma_callback(void *data)
{
struct atmel_tdes_dev *dd = data;
/* dma_lch_out - completed */
tasklet_schedule(&dd->done_task);
}
static int atmel_tdes_write_ctrl(struct atmel_tdes_dev *dd)
{
int err;
u32 valmr = TDES_MR_SMOD_PDC;
err = atmel_tdes_hw_init(dd);
if (err)
return err;
if (!dd->caps.has_dma)
atmel_tdes_write(dd, TDES_PTCR,
TDES_PTCR_TXTDIS | TDES_PTCR_RXTDIS);
/* MR register must be set before IV registers */
if (dd->ctx->keylen > (DES_KEY_SIZE << 1)) {
valmr |= TDES_MR_KEYMOD_3KEY;
valmr |= TDES_MR_TDESMOD_TDES;
} else if (dd->ctx->keylen > DES_KEY_SIZE) {
valmr |= TDES_MR_KEYMOD_2KEY;
valmr |= TDES_MR_TDESMOD_TDES;
} else {
valmr |= TDES_MR_TDESMOD_DES;
}
valmr |= dd->flags & TDES_FLAGS_MODE_MASK;
atmel_tdes_write(dd, TDES_MR, valmr);
atmel_tdes_write_n(dd, TDES_KEY1W1R, dd->ctx->key,
dd->ctx->keylen >> 2);
if (dd->req->iv && (valmr & TDES_MR_OPMOD_MASK) != TDES_MR_OPMOD_ECB)
atmel_tdes_write_n(dd, TDES_IV1R, (void *)dd->req->iv, 2);
return 0;
}
static int atmel_tdes_crypt_pdc_stop(struct atmel_tdes_dev *dd)
{
int err = 0;
size_t count;
atmel_tdes_write(dd, TDES_PTCR, TDES_PTCR_TXTDIS|TDES_PTCR_RXTDIS);
if (dd->flags & TDES_FLAGS_FAST) {
dma_unmap_sg(dd->dev, dd->out_sg, 1, DMA_FROM_DEVICE);
dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
} else {
dma_sync_single_for_device(dd->dev, dd->dma_addr_out,
dd->dma_size, DMA_FROM_DEVICE);
/* copy data */
count = atmel_tdes_sg_copy(&dd->out_sg, &dd->out_offset,
dd->buf_out, dd->buflen, dd->dma_size, 1);
if (count != dd->dma_size) {
err = -EINVAL;
pr_err("not all data converted: %zu\n", count);
}
}
return err;
}
static int atmel_tdes_buff_init(struct atmel_tdes_dev *dd)
{
int err = -ENOMEM;
dd->buf_in = (void *)__get_free_pages(GFP_KERNEL, 0);
dd->buf_out = (void *)__get_free_pages(GFP_KERNEL, 0);
dd->buflen = PAGE_SIZE;
dd->buflen &= ~(DES_BLOCK_SIZE - 1);
if (!dd->buf_in || !dd->buf_out) {
dev_err(dd->dev, "unable to alloc pages.\n");
goto err_alloc;
}
/* MAP here */
dd->dma_addr_in = dma_map_single(dd->dev, dd->buf_in,
dd->buflen, DMA_TO_DEVICE);
if (dma_mapping_error(dd->dev, dd->dma_addr_in)) {
dev_err(dd->dev, "dma %zd bytes error\n", dd->buflen);
err = -EINVAL;
goto err_map_in;
}
dd->dma_addr_out = dma_map_single(dd->dev, dd->buf_out,
dd->buflen, DMA_FROM_DEVICE);
if (dma_mapping_error(dd->dev, dd->dma_addr_out)) {
dev_err(dd->dev, "dma %zd bytes error\n", dd->buflen);
err = -EINVAL;
goto err_map_out;
}
return 0;
err_map_out:
dma_unmap_single(dd->dev, dd->dma_addr_in, dd->buflen,
DMA_TO_DEVICE);
err_map_in:
err_alloc:
free_page((unsigned long)dd->buf_out);
free_page((unsigned long)dd->buf_in);
if (err)
pr_err("error: %d\n", err);
return err;
}
static void atmel_tdes_buff_cleanup(struct atmel_tdes_dev *dd)
{
dma_unmap_single(dd->dev, dd->dma_addr_out, dd->buflen,
DMA_FROM_DEVICE);
dma_unmap_single(dd->dev, dd->dma_addr_in, dd->buflen,
DMA_TO_DEVICE);
free_page((unsigned long)dd->buf_out);
free_page((unsigned long)dd->buf_in);
}
static int atmel_tdes_crypt_pdc(struct atmel_tdes_dev *dd,
dma_addr_t dma_addr_in,
dma_addr_t dma_addr_out, int length)
{
struct atmel_tdes_reqctx *rctx = skcipher_request_ctx(dd->req);
int len32;
dd->dma_size = length;
if (!(dd->flags & TDES_FLAGS_FAST)) {
dma_sync_single_for_device(dd->dev, dma_addr_in, length,
DMA_TO_DEVICE);
}
switch (rctx->mode & TDES_FLAGS_OPMODE_MASK) {
case TDES_FLAGS_CFB8:
len32 = DIV_ROUND_UP(length, sizeof(u8));
break;
case TDES_FLAGS_CFB16:
len32 = DIV_ROUND_UP(length, sizeof(u16));
break;
default:
len32 = DIV_ROUND_UP(length, sizeof(u32));
break;
}
atmel_tdes_write(dd, TDES_PTCR, TDES_PTCR_TXTDIS|TDES_PTCR_RXTDIS);
atmel_tdes_write(dd, TDES_TPR, dma_addr_in);
atmel_tdes_write(dd, TDES_TCR, len32);
atmel_tdes_write(dd, TDES_RPR, dma_addr_out);
atmel_tdes_write(dd, TDES_RCR, len32);
/* Enable Interrupt */
atmel_tdes_write(dd, TDES_IER, TDES_INT_ENDRX);
/* Start DMA transfer */
atmel_tdes_write(dd, TDES_PTCR, TDES_PTCR_TXTEN | TDES_PTCR_RXTEN);
return 0;
}
static int atmel_tdes_crypt_dma(struct atmel_tdes_dev *dd,
dma_addr_t dma_addr_in,
dma_addr_t dma_addr_out, int length)
{
struct atmel_tdes_reqctx *rctx = skcipher_request_ctx(dd->req);
struct scatterlist sg[2];
struct dma_async_tx_descriptor *in_desc, *out_desc;
enum dma_slave_buswidth addr_width;
dd->dma_size = length;
if (!(dd->flags & TDES_FLAGS_FAST)) {
dma_sync_single_for_device(dd->dev, dma_addr_in, length,
DMA_TO_DEVICE);
}
switch (rctx->mode & TDES_FLAGS_OPMODE_MASK) {
case TDES_FLAGS_CFB8:
addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
break;
case TDES_FLAGS_CFB16:
addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
break;
default:
addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
break;
}
dd->dma_lch_in.dma_conf.dst_addr_width = addr_width;
dd->dma_lch_out.dma_conf.src_addr_width = addr_width;
dmaengine_slave_config(dd->dma_lch_in.chan, &dd->dma_lch_in.dma_conf);
dmaengine_slave_config(dd->dma_lch_out.chan, &dd->dma_lch_out.dma_conf);
dd->flags |= TDES_FLAGS_DMA;
sg_init_table(&sg[0], 1);
sg_dma_address(&sg[0]) = dma_addr_in;
sg_dma_len(&sg[0]) = length;
sg_init_table(&sg[1], 1);
sg_dma_address(&sg[1]) = dma_addr_out;
sg_dma_len(&sg[1]) = length;
in_desc = dmaengine_prep_slave_sg(dd->dma_lch_in.chan, &sg[0],
1, DMA_MEM_TO_DEV,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!in_desc)
return -EINVAL;
out_desc = dmaengine_prep_slave_sg(dd->dma_lch_out.chan, &sg[1],
1, DMA_DEV_TO_MEM,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!out_desc)
return -EINVAL;
out_desc->callback = atmel_tdes_dma_callback;
out_desc->callback_param = dd;
dmaengine_submit(out_desc);
dma_async_issue_pending(dd->dma_lch_out.chan);
dmaengine_submit(in_desc);
dma_async_issue_pending(dd->dma_lch_in.chan);
return 0;
}
static int atmel_tdes_crypt_start(struct atmel_tdes_dev *dd)
{
int err, fast = 0, in, out;
size_t count;
dma_addr_t addr_in, addr_out;
if ((!dd->in_offset) && (!dd->out_offset)) {
/* check for alignment */
in = IS_ALIGNED((u32)dd->in_sg->offset, sizeof(u32)) &&
IS_ALIGNED(dd->in_sg->length, dd->ctx->block_size);
out = IS_ALIGNED((u32)dd->out_sg->offset, sizeof(u32)) &&
IS_ALIGNED(dd->out_sg->length, dd->ctx->block_size);
fast = in && out;
if (sg_dma_len(dd->in_sg) != sg_dma_len(dd->out_sg))
fast = 0;
}
if (fast) {
count = min_t(size_t, dd->total, sg_dma_len(dd->in_sg));
count = min_t(size_t, count, sg_dma_len(dd->out_sg));
err = dma_map_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
if (!err) {
dev_err(dd->dev, "dma_map_sg() error\n");
return -EINVAL;
}
err = dma_map_sg(dd->dev, dd->out_sg, 1,
DMA_FROM_DEVICE);
if (!err) {
dev_err(dd->dev, "dma_map_sg() error\n");
dma_unmap_sg(dd->dev, dd->in_sg, 1,
DMA_TO_DEVICE);
return -EINVAL;
}
addr_in = sg_dma_address(dd->in_sg);
addr_out = sg_dma_address(dd->out_sg);
dd->flags |= TDES_FLAGS_FAST;
} else {
/* use cache buffers */
count = atmel_tdes_sg_copy(&dd->in_sg, &dd->in_offset,
dd->buf_in, dd->buflen, dd->total, 0);
addr_in = dd->dma_addr_in;
addr_out = dd->dma_addr_out;
dd->flags &= ~TDES_FLAGS_FAST;
}
dd->total -= count;
if (dd->caps.has_dma)
err = atmel_tdes_crypt_dma(dd, addr_in, addr_out, count);
else
err = atmel_tdes_crypt_pdc(dd, addr_in, addr_out, count);
if (err && (dd->flags & TDES_FLAGS_FAST)) {
dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
dma_unmap_sg(dd->dev, dd->out_sg, 1, DMA_TO_DEVICE);
}
return err;
}
static void
atmel_tdes_set_iv_as_last_ciphertext_block(struct atmel_tdes_dev *dd)
{
struct skcipher_request *req = dd->req;
struct atmel_tdes_reqctx *rctx = skcipher_request_ctx(req);
struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
unsigned int ivsize = crypto_skcipher_ivsize(skcipher);
if (req->cryptlen < ivsize)
return;
if (rctx->mode & TDES_FLAGS_ENCRYPT) {
scatterwalk_map_and_copy(req->iv, req->dst,
req->cryptlen - ivsize, ivsize, 0);
} else {
if (req->src == req->dst)
memcpy(req->iv, rctx->lastc, ivsize);
else
scatterwalk_map_and_copy(req->iv, req->src,
req->cryptlen - ivsize,
ivsize, 0);
}
}
static void atmel_tdes_finish_req(struct atmel_tdes_dev *dd, int err)
{
struct skcipher_request *req = dd->req;
struct atmel_tdes_reqctx *rctx = skcipher_request_ctx(req);
clk_disable_unprepare(dd->iclk);
dd->flags &= ~TDES_FLAGS_BUSY;
if (!err && (rctx->mode & TDES_FLAGS_OPMODE_MASK) != TDES_FLAGS_ECB)
atmel_tdes_set_iv_as_last_ciphertext_block(dd);
req->base.complete(&req->base, err);
}
static int atmel_tdes_handle_queue(struct atmel_tdes_dev *dd,
struct skcipher_request *req)
{
struct crypto_async_request *async_req, *backlog;
struct atmel_tdes_ctx *ctx;
struct atmel_tdes_reqctx *rctx;
unsigned long flags;
int err, ret = 0;
spin_lock_irqsave(&dd->lock, flags);
if (req)
ret = crypto_enqueue_request(&dd->queue, &req->base);
if (dd->flags & TDES_FLAGS_BUSY) {
spin_unlock_irqrestore(&dd->lock, flags);
return ret;
}
backlog = crypto_get_backlog(&dd->queue);
async_req = crypto_dequeue_request(&dd->queue);
if (async_req)
dd->flags |= TDES_FLAGS_BUSY;
spin_unlock_irqrestore(&dd->lock, flags);
if (!async_req)
return ret;
if (backlog)
backlog->complete(backlog, -EINPROGRESS);
req = skcipher_request_cast(async_req);
/* assign new request to device */
dd->req = req;
dd->total = req->cryptlen;
dd->in_offset = 0;
dd->in_sg = req->src;
dd->out_offset = 0;
dd->out_sg = req->dst;
rctx = skcipher_request_ctx(req);
ctx = crypto_skcipher_ctx(crypto_skcipher_reqtfm(req));
rctx->mode &= TDES_FLAGS_MODE_MASK;
dd->flags = (dd->flags & ~TDES_FLAGS_MODE_MASK) | rctx->mode;
dd->ctx = ctx;
ctx->dd = dd;
err = atmel_tdes_write_ctrl(dd);
if (!err)
err = atmel_tdes_crypt_start(dd);
if (err) {
/* des_task will not finish it, so do it here */
atmel_tdes_finish_req(dd, err);
tasklet_schedule(&dd->queue_task);
}
return ret;
}
static int atmel_tdes_crypt_dma_stop(struct atmel_tdes_dev *dd)
{
int err = -EINVAL;
size_t count;
if (dd->flags & TDES_FLAGS_DMA) {
err = 0;
if (dd->flags & TDES_FLAGS_FAST) {
dma_unmap_sg(dd->dev, dd->out_sg, 1, DMA_FROM_DEVICE);
dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
} else {
dma_sync_single_for_device(dd->dev, dd->dma_addr_out,
dd->dma_size, DMA_FROM_DEVICE);
/* copy data */
count = atmel_tdes_sg_copy(&dd->out_sg, &dd->out_offset,
dd->buf_out, dd->buflen, dd->dma_size, 1);
if (count != dd->dma_size) {
err = -EINVAL;
pr_err("not all data converted: %zu\n", count);
}
}
}
return err;
}
static int atmel_tdes_crypt(struct skcipher_request *req, unsigned long mode)
{
struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
struct atmel_tdes_ctx *ctx = crypto_skcipher_ctx(skcipher);
struct atmel_tdes_reqctx *rctx = skcipher_request_ctx(req);
switch (mode & TDES_FLAGS_OPMODE_MASK) {
case TDES_FLAGS_CFB8:
if (!IS_ALIGNED(req->cryptlen, CFB8_BLOCK_SIZE)) {
pr_err("request size is not exact amount of CFB8 blocks\n");
return -EINVAL;
}
ctx->block_size = CFB8_BLOCK_SIZE;
break;
case TDES_FLAGS_CFB16:
if (!IS_ALIGNED(req->cryptlen, CFB16_BLOCK_SIZE)) {
pr_err("request size is not exact amount of CFB16 blocks\n");
return -EINVAL;
}
ctx->block_size = CFB16_BLOCK_SIZE;
break;
case TDES_FLAGS_CFB32:
if (!IS_ALIGNED(req->cryptlen, CFB32_BLOCK_SIZE)) {
pr_err("request size is not exact amount of CFB32 blocks\n");
return -EINVAL;
}
ctx->block_size = CFB32_BLOCK_SIZE;
break;
default:
if (!IS_ALIGNED(req->cryptlen, DES_BLOCK_SIZE)) {
pr_err("request size is not exact amount of DES blocks\n");
return -EINVAL;
}
ctx->block_size = DES_BLOCK_SIZE;
break;
}
rctx->mode = mode;
if ((mode & TDES_FLAGS_OPMODE_MASK) != TDES_FLAGS_ECB &&
!(mode & TDES_FLAGS_ENCRYPT) && req->src == req->dst) {
unsigned int ivsize = crypto_skcipher_ivsize(skcipher);
if (req->cryptlen >= ivsize)
scatterwalk_map_and_copy(rctx->lastc, req->src,
req->cryptlen - ivsize,
ivsize, 0);
}
return atmel_tdes_handle_queue(ctx->dd, req);
}
static int atmel_tdes_dma_init(struct atmel_tdes_dev *dd)
{
int ret;
/* Try to grab 2 DMA channels */
dd->dma_lch_in.chan = dma_request_chan(dd->dev, "tx");
if (IS_ERR(dd->dma_lch_in.chan)) {
ret = PTR_ERR(dd->dma_lch_in.chan);
goto err_dma_in;
}
dd->dma_lch_in.dma_conf.dst_addr = dd->phys_base +
TDES_IDATA1R;
dd->dma_lch_in.dma_conf.src_maxburst = 1;
dd->dma_lch_in.dma_conf.src_addr_width =
DMA_SLAVE_BUSWIDTH_4_BYTES;
dd->dma_lch_in.dma_conf.dst_maxburst = 1;
dd->dma_lch_in.dma_conf.dst_addr_width =
DMA_SLAVE_BUSWIDTH_4_BYTES;
dd->dma_lch_in.dma_conf.device_fc = false;
dd->dma_lch_out.chan = dma_request_chan(dd->dev, "rx");
if (IS_ERR(dd->dma_lch_out.chan)) {
ret = PTR_ERR(dd->dma_lch_out.chan);
goto err_dma_out;
}
dd->dma_lch_out.dma_conf.src_addr = dd->phys_base +
TDES_ODATA1R;
dd->dma_lch_out.dma_conf.src_maxburst = 1;
dd->dma_lch_out.dma_conf.src_addr_width =
DMA_SLAVE_BUSWIDTH_4_BYTES;
dd->dma_lch_out.dma_conf.dst_maxburst = 1;
dd->dma_lch_out.dma_conf.dst_addr_width =
DMA_SLAVE_BUSWIDTH_4_BYTES;
dd->dma_lch_out.dma_conf.device_fc = false;
return 0;
err_dma_out:
dma_release_channel(dd->dma_lch_in.chan);
err_dma_in:
dev_err(dd->dev, "no DMA channel available\n");
return ret;
}
static void atmel_tdes_dma_cleanup(struct atmel_tdes_dev *dd)
{
dma_release_channel(dd->dma_lch_in.chan);
dma_release_channel(dd->dma_lch_out.chan);
}
static int atmel_des_setkey(struct crypto_skcipher *tfm, const u8 *key,
unsigned int keylen)
{
struct atmel_tdes_ctx *ctx = crypto_skcipher_ctx(tfm);
int err;
err = verify_skcipher_des_key(tfm, key);
if (err)
return err;
memcpy(ctx->key, key, keylen);
ctx->keylen = keylen;
return 0;
}
static int atmel_tdes_setkey(struct crypto_skcipher *tfm, const u8 *key,
unsigned int keylen)
{
struct atmel_tdes_ctx *ctx = crypto_skcipher_ctx(tfm);
int err;
err = verify_skcipher_des3_key(tfm, key);
if (err)
return err;
memcpy(ctx->key, key, keylen);
ctx->keylen = keylen;
return 0;
}
static int atmel_tdes_ecb_encrypt(struct skcipher_request *req)
{
return atmel_tdes_crypt(req, TDES_FLAGS_ECB | TDES_FLAGS_ENCRYPT);
}
static int atmel_tdes_ecb_decrypt(struct skcipher_request *req)
{
return atmel_tdes_crypt(req, TDES_FLAGS_ECB);
}
static int atmel_tdes_cbc_encrypt(struct skcipher_request *req)
{
return atmel_tdes_crypt(req, TDES_FLAGS_CBC | TDES_FLAGS_ENCRYPT);
}
static int atmel_tdes_cbc_decrypt(struct skcipher_request *req)
{
return atmel_tdes_crypt(req, TDES_FLAGS_CBC);
}
static int atmel_tdes_cfb_encrypt(struct skcipher_request *req)
{
return atmel_tdes_crypt(req, TDES_FLAGS_CFB64 | TDES_FLAGS_ENCRYPT);
}
static int atmel_tdes_cfb_decrypt(struct skcipher_request *req)
{
return atmel_tdes_crypt(req, TDES_FLAGS_CFB64);
}
static int atmel_tdes_cfb8_encrypt(struct skcipher_request *req)
{
return atmel_tdes_crypt(req, TDES_FLAGS_CFB8 | TDES_FLAGS_ENCRYPT);
}
static int atmel_tdes_cfb8_decrypt(struct skcipher_request *req)
{
return atmel_tdes_crypt(req, TDES_FLAGS_CFB8);
}
static int atmel_tdes_cfb16_encrypt(struct skcipher_request *req)
{
return atmel_tdes_crypt(req, TDES_FLAGS_CFB16 | TDES_FLAGS_ENCRYPT);
}
static int atmel_tdes_cfb16_decrypt(struct skcipher_request *req)
{
return atmel_tdes_crypt(req, TDES_FLAGS_CFB16);
}
static int atmel_tdes_cfb32_encrypt(struct skcipher_request *req)
{
return atmel_tdes_crypt(req, TDES_FLAGS_CFB32 | TDES_FLAGS_ENCRYPT);
}
static int atmel_tdes_cfb32_decrypt(struct skcipher_request *req)
{
return atmel_tdes_crypt(req, TDES_FLAGS_CFB32);
}
static int atmel_tdes_ofb_encrypt(struct skcipher_request *req)
{
return atmel_tdes_crypt(req, TDES_FLAGS_OFB | TDES_FLAGS_ENCRYPT);
}
static int atmel_tdes_ofb_decrypt(struct skcipher_request *req)
{
return atmel_tdes_crypt(req, TDES_FLAGS_OFB);
}
static int atmel_tdes_init_tfm(struct crypto_skcipher *tfm)
{
struct atmel_tdes_ctx *ctx = crypto_skcipher_ctx(tfm);
struct atmel_tdes_dev *dd;
crypto_skcipher_set_reqsize(tfm, sizeof(struct atmel_tdes_reqctx));
dd = atmel_tdes_find_dev(ctx);
if (!dd)
return -ENODEV;
return 0;
}
static void atmel_tdes_skcipher_alg_init(struct skcipher_alg *alg)
{
alg->base.cra_priority = ATMEL_TDES_PRIORITY;
alg->base.cra_flags = CRYPTO_ALG_ASYNC;
alg->base.cra_ctxsize = sizeof(struct atmel_tdes_ctx),
alg->base.cra_module = THIS_MODULE;
alg->init = atmel_tdes_init_tfm;
}
static struct skcipher_alg tdes_algs[] = {
{
.base.cra_name = "ecb(des)",
.base.cra_driver_name = "atmel-ecb-des",
.base.cra_blocksize = DES_BLOCK_SIZE,
.base.cra_alignmask = 0x7,
.min_keysize = DES_KEY_SIZE,
.max_keysize = DES_KEY_SIZE,
.setkey = atmel_des_setkey,
.encrypt = atmel_tdes_ecb_encrypt,
.decrypt = atmel_tdes_ecb_decrypt,
},
{
.base.cra_name = "cbc(des)",
.base.cra_driver_name = "atmel-cbc-des",
.base.cra_blocksize = DES_BLOCK_SIZE,
.base.cra_alignmask = 0x7,
.min_keysize = DES_KEY_SIZE,
.max_keysize = DES_KEY_SIZE,
.ivsize = DES_BLOCK_SIZE,
.setkey = atmel_des_setkey,
.encrypt = atmel_tdes_cbc_encrypt,
.decrypt = atmel_tdes_cbc_decrypt,
},
{
.base.cra_name = "cfb(des)",
.base.cra_driver_name = "atmel-cfb-des",
.base.cra_blocksize = DES_BLOCK_SIZE,
.base.cra_alignmask = 0x7,
.min_keysize = DES_KEY_SIZE,
.max_keysize = DES_KEY_SIZE,
.ivsize = DES_BLOCK_SIZE,
.setkey = atmel_des_setkey,
.encrypt = atmel_tdes_cfb_encrypt,
.decrypt = atmel_tdes_cfb_decrypt,
},
{
.base.cra_name = "cfb8(des)",
.base.cra_driver_name = "atmel-cfb8-des",
.base.cra_blocksize = CFB8_BLOCK_SIZE,
.base.cra_alignmask = 0,
.min_keysize = DES_KEY_SIZE,
.max_keysize = DES_KEY_SIZE,
.ivsize = DES_BLOCK_SIZE,
.setkey = atmel_des_setkey,
.encrypt = atmel_tdes_cfb8_encrypt,
.decrypt = atmel_tdes_cfb8_decrypt,
},
{
.base.cra_name = "cfb16(des)",
.base.cra_driver_name = "atmel-cfb16-des",
.base.cra_blocksize = CFB16_BLOCK_SIZE,
.base.cra_alignmask = 0x1,
.min_keysize = DES_KEY_SIZE,
.max_keysize = DES_KEY_SIZE,
.ivsize = DES_BLOCK_SIZE,
.setkey = atmel_des_setkey,
.encrypt = atmel_tdes_cfb16_encrypt,
.decrypt = atmel_tdes_cfb16_decrypt,
},
{
.base.cra_name = "cfb32(des)",
.base.cra_driver_name = "atmel-cfb32-des",
.base.cra_blocksize = CFB32_BLOCK_SIZE,
.base.cra_alignmask = 0x3,
.min_keysize = DES_KEY_SIZE,
.max_keysize = DES_KEY_SIZE,
.ivsize = DES_BLOCK_SIZE,
.setkey = atmel_des_setkey,
.encrypt = atmel_tdes_cfb32_encrypt,
.decrypt = atmel_tdes_cfb32_decrypt,
},
{
.base.cra_name = "ofb(des)",